Integrity casting quality Innovation leads the future

Changchun Weicheng Machinery Equipment was selected for the Rising China column

To unearth the cultural essence of traditional Chinese business practices, and in conjunction with brand development strategies in the context of the new era and new circumstances.

Creating a Breathable Home - Interview with Shang Zhizhong, General Manager of Changchun Weicheng Machinery Equipment Co., Ltd.

In March 2003, a large-scale SARS outbreak with a sudden onset occurred in Amoy Gardens, Hong Kong. Amoy Gardens residents accounted for one-seventh of the 296 people who died in Hong Kong due to SARS!

Qianjia ventilation constant pressure machine - let you breathe fresh and healthy air

Weicheng Machinery's recent innovation, R&D, and development

Changchun Weicheng Mechanical Equipment Co., Ltd. has been continuously researching and innovating over the past few years.

The Weicheng Machinery invention, Qianjia ventilation constant pressure machine patent

Changchun Weicheng Mechanical Equipment Co., Ltd.：Qianjia Ventilation Constant Pressure MachineNational invention patent solves the problem of backflow of sewage from the range hood.

Ruan Min, Deputy Secretary-General of the Hangzhou Municipal Committee, and Feng Guogang, Deputy Director of the Changchun Municipal Development and Reform Commission, came to provide guidance

Changchun Weicheng Machinery Equipment Co., Ltd., established in 2011, is located at No. 885, Dujuan Road, Jingtong High-tech Industrial Development Zone, Changchun.

Changchun Weicheng Machinery Equipment Co., Ltd.

Changchun Weicheng Machinery Equipment Co., Ltd.: Qianjia ventilation and constant pressure machine national invention patent, authoritatively promoted by Xinhua News Agency and CCTV.

Xinhua News Agency's Rural Revitalization Channel's "Artisanal Brand Dialogue" (Heart of Craftsmanship Brand Dialogue) interviewed Wei Cheng Machinery's Shang Zhizhong

Weicheng Machinery uses ingenuity to "create a room that breathes"

Qianjia Appliances -- Worth Having

Nationally patented invention, promoted by Xinhua News Agency and CCTV; shortlisted for the Ministry of Science and Technology's disruptive technology.

Qianjia ventilation and constant pressure machine creates a house that breathes!

The current nationwide epidemic situation is quite severe, with the entire city under lockdown and everyone under home quarantine.

Health hazards of negative pressure in enclosed spaces

Sewer Odor Reversal: The bathroom often experiences backflow of odors, especially when the range hood or other exhaust equipment is turned on, the backflow phenomenon will be more serious and obvious. This is caused by the negative pressure generated indoors, which causes the odor from the sewer to backflow. Usually, air fresheners are used to mask the odor, but this is only a temporary solution. Because the sewer contains a large amount of toxic gases, such as methane, hydrogen sulfide, ammonia, carbon monoxide, carbon dioxide, etc., being in such an environment will irritate the eyes and respiratory system. Spread of Bacteria: The sewer also contains a large number of pathogenic microorganisms, such as bacteria, parasites, and fungi. Due to the serious negative pressure indoors, some bacteria will also enter the human body with the backflow of air from the sewer, causing skin and respiratory infections. This transmission is invisible and often overlooked by many people, but it is very serious and poses a great threat to human health. Aerosol Virus Infection: I believe everyone is familiar with aerosols, but do you know that sewers can also produce aerosols? Due to the systematic negative pressure and intermittent negative pressure generated indoors, the aerosols from the sewer backflow and adhere to toiletries and towels, causing endless harm. At the end of 2019, the novel coronavirus swept the globe and is still breaking out in various parts of the country. Once the sewer is contaminated with the novel coronavirus, when the range hood and exhaust system are used to create negative pressure, the virus in the sewer will be transmitted indoors. Because the novel coronavirus survives longer in cold, low-temperature, and humid environments, it provides ample time for negative pressure transmission of the virus. Therefore, negative pressure is the culprit in the transmission of the virus. Many cases illustrate the aerosol transmission of the novel coronavirus from sewers. For example: In 2020, the National Health Commission issued the "Diagnosis and Treatment Plan for Novel Coronavirus Pneumonia." This plan added the transmission route of the novel coronavirus: "In a relatively closed environment, prolonged exposure to high-concentration aerosols may lead to aerosol transmission." Academician Zhong Nanshan of the Chinese Academy of Engineering also reminded the public at a press conference to pay attention to the transmission of the novel coronavirus through sewers. Academician Zhong Nanshan gave an example, saying that in the Hong Kong Special Administrative Region's Kangmei Building, there were cases of infection between upstairs and downstairs residents, similar to the Amoy Gardens incident during the SARS outbreak in Hong Kong, where more than 300 people in the entire building became ill. This shows that aerosols containing the novel coronavirus can spread to every room through common sewer pipes. In 2021, the chief physician of the infectious disease prevention and control department of a municipal CDC also introduced a typical case, reminding citizens to pay attention to the safety of sewers and floor drains. At that time, three families in a residential building in a certain city were infected with novel coronavirus pneumonia. During the investigation, experts found that the three families were residents of the same unit and on the same floor, but they had no contact with each other. The first to fall ill was a resident on a lower floor, followed by those on upper floors. After in-depth investigation, epidemiological analysis, and multiple studies, experts discovered that the sewer pipes and exhaust pipes of the three families were interconnected. They then put a dye into the sewer of the lower-floor resident. Due to the force and pressure, and the large negative pressure indoors, a large amount of aerosol will be generated. The aerosol containing the virus is squeezed through the interconnected floor drains and exhaust vents to the homes of the upper-floor residents, causing infection. This case proves that interconnected sewer pipes can transmit the novel coronavirus. There are many similar cases, and the National Key Laboratory of Respiratory Diseases has many similar research results, all of which prove that aerosols carrying the virus can spread through the same sewer pipes to every room, causing cross-infection. So the key question is, why does the virus in the sewer backflow into the room? It is because of the updating of building materials, the airtightness of houses is getting better and better, and systematic negative pressure will be generated in the house. When the range hood and exhaust fan are turned on, intermittent negative pressure will be generated. The formation of negative pressure will cause the backflow of sewer odor and bacteria, resulting in health hazards. Therefore, negative pressure is the culprit in the transmission of the virus. The Qianjia ventilation pressure balancing machine can automatically balance the indoor and outdoor negative pressure, prevent the backflow of sewer gas into the room, and thus prevent the spread of the virus. The Qianjia ventilation pressure balancing machine is intelligent and user-friendly, creating a breathable room! Experience a different fresh and healthy life!

The Dangers of Sewer-Spread Viruses - Omicron Edition

Since March 2022, the Omicron variant has swept through Jilin and Changchun, its high transmission rate and stealthy nature posing significant challenges to epidemic prevention and control. The entire city implemented a lockdown, with all residents placed under home quarantine. At a press conference on Jilin Province's epidemic prevention and control work, Gu Rui, vice president of Jilin University Affiliated Hospital, reminded residents to prevent gas backflow during home quarantine. This announcement has drawn significant public attention. Jilin Provincial Epidemic Prevention and Control Leading Group Propaganda Group: Preventing Gas Backflow. Firstly, when not in use, close the drain at the bottom of the washbasin and add a small amount of water to create a sealed barrier. Open it when using the washbasin. Secondly, use a deodorant drain or seal the drain with a water-filled plastic bag, removing it when needed. Thirdly, during the epidemic, use plastic film and adhesive tape to seal the bathroom exhaust fan to avoid potential gas backflow. Fourthly, close the toilet lid before flushing after use. Fifthly, when using the range hood, ensure that the washbasin, drain, toilet, and exhaust fan are sealed. Open windows to ensure air exchange to prevent negative pressure caused by the range hood from causing potential contaminated gas to backflow through indoor pipes. When not in use, temporarily seal with cling film and adhesive tape. These five methods aim to prevent virus-carrying gases from entering homes. However, many find these methods complicated, inconvenient, and difficult to implement, leading to potential health risks for those who don't follow them. What better prevention methods are there? Changchun Kuancheng District faced a severe situation during this epidemic. Due to the high population density in the area's densely populated residential areas, some mild cases during home quarantine led to the entire unit being sealed off, increasing the risk of cross-infection. Even worse, a single positive case resulted in the entire unit's residents being taken away for centralized quarantine, causing significant fear among residents. This confirms Academician Zhong Nanshan's conclusion that virus-carrying aerosols can spread through shared sewers, causing cross-infection in each room. This is a serious and widespread cross-infection pathway. Given the long-term threat posed by the novel coronavirus to public health, residents should pay close attention to this issue and take steps to eliminate the risk. Our company offers the Qianjia Ventilation Constant Pressure Machine, an independently developed product filling a market gap in constant pressure ventilation and air purification. It's been highly recommended by CCTV's "Rise of China" program! With modern buildings becoming increasingly airtight and the power of range hoods and bathroom exhaust fans increasing, this creates systematic and intermittent negative pressure indoors. Negative pressure not only causes odors and makes windows difficult to open, it also spreads viruses and can cause irreversible damage to brain memory cells. The Qianjia Ventilation Constant Pressure Machine features fully intelligent circuit control and 13 imported chips. It precisely balances indoor and outdoor negative pressure, allowing users to comfortably enjoy fresh air. The Qianjia Ventilation Constant Pressure Machine also features gas leak alarm ventilation with mobile phone alerts, indoor air purification, and ventilation heating functions. It's committed to resolving issues of air health and safety in confined spaces. The Qianjia Ventilation Constant Pressure Machine mainly automatically balances indoor and outdoor negative pressure to prevent backflow of odors and virus-carrying gases from the sewer, thus preventing virus transmission. During this epidemic, the Qianjia Ventilation Constant Pressure Machine helps you solve a series of problems caused by indoor negative pressure, including the transmission of viruses from the sewer, which jeopardizes health! Qianjia Ventilation Constant Pressure Machine – creating breathable rooms!

Provincial epidemic prevention and control leading group publicity group: Prevent gas backflow.

Focus on health, Qianjiameng transformation and upgrading - Interview with Shang Zhizhong, general manager of Changchun Weicheng Machinery Equipment Co., Ltd.

The "14th Five-Year Plan" proposes accelerating the development of a modern industrial system and consolidating and expanding the foundation of the real economy, including the in-depth implementation of the manufacturing power strategy and the development and expansion of strategic emerging industries. The prosperity, growth, and high-quality development of China's manufacturing industry depend on the tireless efforts and innovation of manufacturing enterprises, and on generations of manufacturing entrepreneurs. Shang Zhizhong and his Changchun Weicheng Mechanical Equipment Co., Ltd. are among the best. "Establish with precision, win with quality, innovate with wisdom, govern with virtue, and serve the country with intelligence" is a true reflection of Shang Zhizhong's long entrepreneurial journey. Along with the rise of China's manufacturing industry, the courageous, insightful, and proactive Shang Zhizhong is also writing his own chapter of struggle.

Changchun Weicheng Machinery Equipment Co., Ltd. - Creating a Breathable Living Space

Creating a Breathable Home ——Interview with Shang Zhizhong, General Manager of Changchun Weicheng Mechanical Equipment Co., Ltd. In March 2003, a large-scale SARS outbreak with sudden onset occurred in Amoy Gardens, Hong Kong. Among the 296 people who died from "SARS" in Hong Kong, residents of Amoy Gardens accounted for one-seventh! What caused the large-scale SARS outbreak in Amoy Gardens? Later, Hong Kong authorities conducted tests in a unit in Amoy Gardens and found that when the bathroom exhaust fan was turned on, the negative pressure generated by the fan directly caused air to flow back into the bathroom from the building's sewage pipes through the floor drain. These air currents may have spread aerosols from the sewage pipes into the bathroom, and the bathroom exhaust fan may have also discharged these aerosols into the courtyard, eventually causing the virus-carrying aerosols to enter other houses through windows, resulting in infection of people in adjacent units—this was the root cause of the SARS outbreak in Amoy Gardens in Hong Kong that year. After the incident, the term "negative pressure in houses" was taken seriously for the first time. How is negative pressure in houses formed? What harm does negative pressure pose to human health? What measures can we take to eliminate negative pressure and maintain a healthy living environment? With these questions in mind, we interviewed Shang Zhizhong, the developer of Qianjia ventilation constant pressure machine and general manager of Changchun Weicheng Mechanical Equipment Co., Ltd. The initial intention of the research and development was to allow people to live healthier lives What is systematic negative pressure? It is the phenomenon where the indoor air pressure is lower than the standard outdoor atmospheric pressure. Due to the principle of constant atmospheric pressure, low indoor air pressure will cause other air currents to supplement the indoor air, mainly through the sewer pipes, while other pathways are closed or have high wind resistance. The long-term accumulation of odors will have a permeation effect, causing some clothes, bedding, and textiles to have odors, causing health hazards and seriously affecting the quality of life. "Nowadays, the airtightness of buildings is getting better and better, and the exhaust power of range hoods and bathroom exhaust fans is getting larger and larger, which can cause systematic and intermittent negative pressure indoors. Negative pressure not only makes it difficult to open doors and windows due to backflow of odors, but also spreads viruses and causes irreversible damage to brain memory cells. It is an invisible killer of health in the new era." Like many Chinese families, Shang Zhizhong once deeply worried about the ventilation and air purification problems in his home. However, after years of experience in the machinery industry, Shang Zhizhong examined most of the household air purification systems on the market and found that: "Firstly, the functions of air purifiers mainly focus on dealing with PM2.5, while the functions targeting volatile organic compounds are much less prominent; secondly, most air purifiers use activated carbon adsorption, and due to the limited adsorption capacity, the filter needs to be replaced frequently, otherwise, the activated carbon saturated with formaldehyde will continuously overflow and release, becoming a source of poison. Some ventilation systems also require a large amount of piping to be laid throughout the room, requiring high indoor ceiling height, complicated engineering, and for already renovated houses, especially older houses that have been occupied for many years, it is almost equivalent to completely renovating the entire house, which is almost impossible to achieve." "Even for me, an insider, it's so difficult to give my family a healthy breathing environment. China is so large, with so many families, so many elderly people and children, what can we do? How many years will it take for air environment management to improve?" This thought lingered in his mind and became a "heart disease" for Shang Zhizhong. If there's nothing on the market, then let's make it ourselves! Since this flash of inspiration appeared in Shang Zhizhong's mind, his heart has never been calm again. Shang Zhizhong did not rush into success, but first explored the technology, starting with building his own research team. To this end, he invested the savings from his many years of work, visited dozens of "big names" in the ventilation technology industry, and after many twists and turns, finally established his own R&D team. From 2016 to 2021, he and his R&D team members worked day and night in the laboratory. After 5 years of R&D, countless experiments, tests, polishing, and iterations, the Qianjia ventilation constant pressure machine was finally successfully developed. The principle of the Qianjia ventilation constant pressure machine is to use a carefully designed multi-stage filtration system and the scientific principle of slight positive air pressure, with the main unit paired with a "Breathing Treasure" to promote the flow of clean air, achieving "metabolism" of indoor air, allowing oxygen-rich fresh air to enter every corner of the room. A Jilin University professor who has close contact with Shang Zhizhong used a well-known Japanese brand air purifier in his home for two years, and frequently encountered readings exceeding the normal range. After inspection and research by Shang Zhizhong's technical team, an emergency solution was provided to the professor: installing a household constant pressure machine. After 24 hours of using the constant pressure machine, the air quality readings in the professor's home finally returned to the normal range, and the problem that had plagued the professor and his family for a long time was successfully resolved. Shang Zhizhong and the Qianjia ventilation constant pressure machine also gained their trust. In the new ventilation industry with numerous brands, why was Shang Zhizhong able to easily solve problems that had plagued other companies for years or even decades? This is inseparable from Shang Zhizhong's adherence to the new ventilation industry, and more importantly, Shang Zhizhong's cultivation of talent and innovation in technology.

General Manager's Profile

Profile Shang Zhizhong, General Manager of Changchun Weicheng Machinery Equipment Co., Ltd., graduated from the Physics Department of Jilin University. In recent years, Shang Zhizhong's company has been doing very well, with remarkable efficiency: Currently, Weicheng Machinery has 5 national invention patents and 16 national utility models. In 2017, it was named a Changchun Municipal Technological Small Giant Enterprise; in 2018, a Jilin Provincial Technological Small Giant Enterprise; in 2019, a national high-tech enterprise; and in 2021, a Changchun Municipal Specialized, Refined, and Innovative Enterprise. From a junior college graduate who just left university in the 1990s to today's wealthy Chinese entrepreneur, Shang Zhizhong's journey has been extraordinary.

China Enterprise Network - "Changchun Weicheng Mechanical Equipment" selected for the "Rising China" column

China Development Network - "Changchun Weicheng Machinery Equipment" selected for the "Rising China" column

China Machinery News Network - "Changchun Weicheng Machinery Equipment" selected for the "Rising China" column

China Mechanical Net - "Changchun Weicheng Mechanical Equipment" Selected for "Rising China" Column

Phoenix.com Jilin - "Changchun Weicheng Machinery Equipment" selected for the "Rising China" column

China News Service, Jilin - "Changchun Weicheng Machinery Equipment" was selected for the "Rising China" column

China Business Network - "Changchun Weicheng Machinery Equipment" selected for the "Rising China" column

Juhe.com - "Changchun Weicheng Machinery Equipment" selected for the "Rising China" column

Xinhua Net - "Hardcore" R&D Leads Weicheng Machinery on the Path of Intelligent Manufacturing

New Development, New Jingyue - "Hardcore" R&D Leads Weicheng Machinery on the Path to Intelligent Manufacturing

Supporting Businesses | "Hardcore" R&D Leads Weicheng Machinery on the Path to Intelligent Manufacturing

Relevant report link for "Weicheng Machinery", an outstanding enterprise representative of Jingyue

Changchun Weicheng Machinery Equipment was selected for the Rising China column

“Changchun Weicheng Mechanical Equipment” Selected for “Rising China” Program To uncover the cultural essence of traditional Chinese business practices and combine it with brand development strategies in the context of the new era, encouraging brand enterprises to establish themselves with integrity and operate with trust, allowing brands to convey Chinese strength and showcase the Chinese image. The "Rising China" program aims to highlight the outstanding performance of national enterprises in establishing national brands, their contributions to the decisive battle against poverty, and their achievements in building trustworthy brands, showcasing the responsibility and social responsibility of contemporary enterprises, and helping enterprises and brands enhance their brand reputation and influence. Changchun Weicheng Mechanical Equipment Co., Ltd., established on July 26, 2011, is a comprehensive enterprise integrating R&D, production, and sales. The company is located at No. 885, Dujuan Road, Jingyue District, Changchun City, covering an area of 13,000 square meters, with 6,000 square meters of modern standard factory buildings, 4,000 square meters of hardened ground, and 3,000 square meters of green space. The company's main products are two: traditional manufacturing industry power generation equipment and stacking and reclaiming wheel mechanisms, serving as a subsidiary production base for China Power Construction Group Changchun Power Equipment Factory; and patented products with independent intellectual property rights, Qianjia brand ventilation and constant pressure machines. "Qianjia" is a registered trademark, creating an independent brand and strengthening the national industry has always been the company's development tenet. The Organizing Committee of the "Rising China" program, in view of the outstanding contributions of Changchun Weicheng Mechanical Equipment Co., Ltd. in the field of mechanical equipment, and in assisting the development of enterprises and promoting the transformation and upgrading of the industry, has included it in the list of enterprises to be supported. Subsequently, the Organizing Committee of the "Rising China" program conducted a thorough and detailed investigation into the company's credentials, management and service models, and corporate integrity. During the inspection, Mr. Shang Zhizhong, General Manager of Changchun Weicheng Mechanical Equipment Co., Ltd., introduced the company's R&D origin and development philosophy. Qianjia ventilation and constant pressure machine is a home appliance product independently developed by the company to fill the market gap. Nowadays, the airtightness of residential buildings is getting better and better, and the power of range hoods and bathroom exhaust fans is getting larger and larger, resulting in systematic intermittent negative pressure in the room. Negative pressure not only makes it difficult to open doors and windows due to backflow, but also spreads viruses, causing irreversible damage to brain memory cells. It is an invisible killer to health in the new era. The Qianjia ventilation and constant pressure machine is controlled by a full-intelligent circuit, with 16 (imported) chips with a sensitivity of one ten-thousandth of a Pascal, which can accurately balance the indoor and outdoor negative pressure, allowing people to comfortably enjoy fresh air. The Qianjia ventilation and constant pressure machine also has a gas leak alarm ventilation function bound to mobile phone prompts. In 2019, the Ministry of Civil Affairs officially released data showing that nearly 1,500 people die from gas leaks in China every year, especially in the north during winter. At present, many gas alarm devices on the market can only alarm without follow-up solutions, and some tragedies are still difficult to avoid. In response to frequent safety accidents, Qianjia ventilation and constant pressure machines are first equipped with high-quality probes that will alarm when the atmospheric content leaks 50ppm (other products on the market are about 200ppm), and simultaneously activate the ventilation mode to dilute the gas alarm concentration, and the buzzer will sound. At the same time, through the 4G Internet of Things, it will bind about 5 mobile phones to make phone calls, WeChat and text messages to notify the person concerned, basically avoiding personal injury, explosions, and other serious accidents. The company has successively applied for 24 national invention and utility model patents, independently researched and developed Qianjia brand ventilation and constant pressure machines, and is committed to solving the problems of air health and life safety in enclosed spaces. In the future, the enterprise will apply what it has learned, strengthen practice, accurately grasp Industry Trends, information and development trends, take the road of independent operation and independent R&D, maintain the company's competitive advantage in the industry, and continue the path of innovation practice. Finally, Changchun Weicheng Mechanical Equipment Co., Ltd. passed the final assessment of the program organizing committee with its good corporate reputation, unique business style, and solid market development capabilities, and was included in the list of supported enterprises. Subsequently, Mr. Shang Zhizhong, General Manager of Changchun Weicheng Mechanical Equipment Co., Ltd., will also be invited to be a guest on the "Rising China" program, discussing business management methods in enterprise development with the host. Source: Changchun Weicheng Mechanical Equipment Co., Ltd.

Supporting Businesses | "Hardcore" R&D Leads Weicheng Machinery on the Path to Intelligent Manufacturing

Supporting Enterprises | "Hardcore" R&D Leads Weichen Machinery on the Path to Intelligent Manufacturing 17 utility model patents, multiple invention patents...With "hardcore" R&D, Changchun Weichen Mechanical Equipment Co., Ltd., located in Changchun Jinyue High-tech Zone, has achieved transformation and upgrading from manufacturing to intelligent manufacturing. Recently, Weichen Machinery was selected for CCTV's "Rising China" column. Weichen Machinery Selected for CCTV's "Rising China" Column On October 24, at Weichen Machinery, relevant leaders showed reporters the company's independently developed achievements - the ventilation constant pressure machine. The silver-white body, the LCD screen on the lower left has multiple function keys, and the industrial-grade circuit board is full of technological sense. "Nowadays, the airtightness of buildings is getting better and better, and the power of range hoods and bathroom exhaust fans is getting bigger and bigger, which will cause negative pressure in the room systematically and intermittently. Negative pressure not only causes sewer backflow and makes it difficult to open doors and windows, but also affects people's health." Relevant leaders introduced that the company's independently developed ventilation constant pressure machine can effectively solve the above problems. The ventilation constant pressure machine can accurately balance the indoor and outdoor negative pressure, and the double filtration system allows people to breathe fresh air. Not only that, the machine also has a built-in high-sensitivity sensing probe with dual detection functions for carbon monoxide and carbon dioxide. When it detects a gas leak, it immediately turns on the alarm mode, and at the same time, opens the inlet and outlet valves and ventilation functions to dilute the indoor gas concentration, and synchronously informs the danger through the 4G Internet of Things platform by binding 5 Mobiles via calls, WeChat, and text messages, to avoid accidents. Weichen Machinery's Independently Developed Ventilation Constant Pressure Machine It took the company's R&D team nearly 5 years to develop the ventilation constant pressure machine. "A R&D team of more than 20 people was formed, nearly 10 million yuan was invested in R&D funds, and hundreds of experiments were conducted." Relevant leaders said that although the company has been affected by the epidemic in the past two years, the pace of independent R&D has not slowed down. It has successively signed R&D cooperation agreements with Northeast Normal University, Changchun University of Technology, and the Basic Medical College of Jilin University, recruited more R&D personnel, and strengthened R&D capabilities. Currently, the ventilation constant pressure machine has passed the inspection and has successfully entered the market. This is just a glimpse of Weichen Machinery's independent R&D. Established in 2011, Weichen Machinery has been committed to the production of power generation equipment and stacking and reclaiming bucket wheel machines in the traditional manufacturing industry. In a 6,000-square-meter modern standard factory building, reporters saw that the entire production process, from CNC cutting to automatic welding, assembly, and finished product cleaning, was orderly and highly efficient. "The company has successively supplied power generation equipment and port stacking and reclaiming machines to countries such as Indonesia, Vietnam, Laos, Bangladesh, Kyrgyzstan, and Pakistan." Relevant leaders said. In order to improve production efficiency and product performance, Weichen Machinery leaders led the company's R&D team to develop bucket wheel machines and their digging buckets, automatic feeding devices, magnetic sealing devices, machine tool laser positioning and transmission screw electromagnetic locking devices, etc., utility model patents. Weichen Machinery has successively been named a Jilin Provincial Small Giant Enterprise, a national high-tech enterprise, and a specialized, refined, and new enterprise. "If an enterprise wants to have lasting vitality, it must transform from manufacturing to intelligent manufacturing." Relevant leaders said that in the future, they will continue to improve their innovation and R&D capabilities, continuously develop new fields, and develop new products. Jinyue High-tech Zone Carries Out Efficient Enterprise Support Actions Behind the development of Weichen Machinery is the Jinyue High-tech Zone's provision of a first-class business environment for enterprises, providing enterprise support services such as benefiting enterprises, warming enterprises, and stabilizing enterprises, enabling enterprises to achieve high-quality development. At present, the Jinyue High-tech Zone has accumulated more than 400 projects, 105 projects with an investment of over 1 billion yuan, and serves 1356 enterprises through enterprise support WeChat groups. High-tech small and micro enterprises such as Weisi Intelligent Technology and Weichen Machinery are developing rapidly; automotive parts supporting enterprises such as Inafa Automotive Sunroof and Xuyang Intelligent Large Screen have successively settled; comprehensive entities such as Zhongdong Port and Changchun International Film Capital Film Base have been successively completed... Changchun Weichen Mechanical Equipment Co., Ltd.

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Why isn't the toilet tank filling with water? What causes sewer odors to back up?

Sewer odors may be due to the floor drain, not the deodorizer. There are many floor drains of varying quality on the market. When choosing a floor drain, it is important to choose one of good quality with a complete deodorizing function.

Ventilation Equipment Installation Standards

Piping and fittings from the closed valve to the project mouth of the ventilation equipment should be welded using 2-3mm thick steel plates, and the welding should be sufficient, uniform and tight. Ventilation pipes in toxic areas should be connected by welding. Ventilation pipes and closed valves should be connected by flanges with closed grooves, and smooth contact should be maintained; flange gaskets should be made of full-circle non-interfacial rubber sealing rings.

Qianjia Electric Appliances was invited to participate in Jilin Traffic Voice Radio Station

Qianjia Electric Appliances was invited to participate in Jilin Traffic Voice Radio Station

How to prevent sewer odors?

In drainage systems, a water seal is a device that allows wastewater and sewage to drain smoothly and freely. The gas passage is sealed by a water column, preventing sewer gases and harmful or toxic gases from escaping into the room. A trap is a pipe fitting that acts as a water seal device. Traps are installed at the outlet of sanitary fixtures or within the structure of the sanitary fixtures themselves (such as in bathrooms). If the water seal of a sanitary fixture's trap is damaged, it can cause the fixture to bubble, overflow, splash, and release harmful and toxic sewer gases, affecting both usability and indoor air quality, and endangering people's physical and mental health.

The principle and function of building negative pressure systems

Building system negative pressure, also known as a unidirectional fresh air system, works by using a high-power motor to forcefully exhaust stale indoor air through an exhaust outlet. This creates a negative pressure environment inside the building. To balance atmospheric pressure, outdoor air is forcefully drawn into the building through window and door gaps or dedicated inlets, creating a complete indoor ventilation system.

Function and control principle of building negative pressure system

Air quality control of fresh air units refers to controlling the temperature and humidity of the air delivered by the fresh air units to satisfactory setpoints, and installing temperature and humidity sensors in the building system's negative pressure. On the air ducts, the coil water valve is switched on or off according to the supply air temperature to ensure the set supply air temperature.

What are the functions of a building's negative pressure system?

Building system negative pressure system is a "forced exhaust, natural inflow" ventilation system, which only installs a central fan in the exhaust system, using the negative pressure principle to drive indoor air flow. Fresh air enters the living space, and dirty air is discharged from the bathroom.

Why are building negative pressure systems more suitable for residential use?

Building system negative pressure refers to the continuous removal of indoor polluted air to the outside by a silent fan, creating negative pressure inside. According to the principle of atmospheric equilibrium, fresh outdoor air is directly introduced into the room through wall-mounted or window-mounted air inlets, keeping the indoor air fresh and clean.

Ventilation Equipment: How to Improve Indoor Ventilation?

How to improve indoor ventilation? A reasonable suggestion is to install mechanical ventilation equipment. Through this, we can ventilate without opening windows, allowing fresh outside air to continuously enter the room and continuously expelling the original polluted air, preventing excessively high carbon dioxide levels indoors. Ventilation equipment also has multi-layer filters that can effectively filter pollutants such as dust, pollen, viruses, exhaust gases, and smoke from the outside air, ensuring clean indoor air.

How to choose the right ventilation equipment for you

How to Choose Suitable Ventilation Equipment1. When choosing ventilation equipment, factors such as family size, population, climate conditions, and environmental pollution should be considered. 2. If only two people live in a friendly place, then a ventilation volume of 60 cubic meters is sufficient, and an economical method is a natural valve or ventilator.

Why is it necessary to install ventilation equipment at home?

The purpose of indoor ventilation equipment is to deliver fresh outdoor air into the room. Previously, outdoor air was relatively clean, and it entered the room through window cracks or by frequently opening windows for ventilation. Now, outdoor air pollution is quite serious, and the windows of indoor rooms are basically closed. Thus, a new problem has arisen: the dust, smoke, and noise outside make opening windows for ventilation unrealistic, while the stuffiness and lack of oxygen when windows are closed affect healthy breathing. Indoor ventilation equipment is a solution to the above problems; it can deliver fresh air into the room, allowing the room to maintain effective ventilation even with the windows closed.

Principle of building system negative pressure

Building system negative pressure exhaust refers to the exhaust fan exhausting air outdoors, creating negative pressure indoors. According to the principle of atmospheric balance, outdoor fresh air directly enters the room through the exterior wall air inlet. In the use of European residential ventilation, the building system negative pressure unidirectional flow system is the mainstream technology on the market. It is a unidirectional flow system with two methods: a separate independent single-host ducted exhaust system and a separate independent modular ductless combined exhaust system.

The importance of ventilation equipment and why ventilation is necessary

Nowadays, most urban residents live in buildings made of reinforced concrete with aluminum alloy windows and doors. These are tightly sealed and poorly ventilated. High-rise buildings in bustling city centers, in particular, have windows and doors that remain closed year-round due to concerns about vehicle noise and excessive dust – resembling concrete cans. This inevitably leads to poor indoor ventilation. Ventilation equipment is then needed to mechanically or naturally introduce sufficient fresh air into the indoor space, while simultaneously expelling polluted air that does not meet hygiene standards. This equipment ensures that the indoor air quality meets both hygiene requirements and the needs of the production process.

Classification of ventilation equipment

A common ventilation device in our lives—the ventilation constant pressure machine—uses mechanical or natural methods to deliver sufficient fresh air into indoor spaces while simultaneously exhausting foul air that does not meet hygiene standards. This ensures that indoor air quality meets hygiene requirements and production process needs. The ventilation facilities within a building are collectively referred to as ventilation equipment; they not only provide good ventilation but also offer economic advantages. Many people are not very familiar with the classifications of ventilation equipment. A good classification of ventilation equipment is beneficial for its future use.

The negative pressure caused by the range hood is disrupting my life

The negative pressure caused by the range hood has been a nuisance in my life. The story begins in the summer of 2016. That year, my daughter was born. It was a surprise, a gift from God, so we named her Jia En. I rarely cooked before, but with the arrival of my new daughter, I started learning to cook. I was quite clumsy at first, making a mess of things. I mainly made stews, such as chicken and mushroom stew, and beef brisket and persimmon stew. But when the range hood was on, there was no problem in summer because the windows were open. In winter, however, problems arose. The doors and windows were closed, and the indoor-outdoor temperature difference reached 50 degrees Celsius. Opening the windows to let in cold air was unbearable. My house is 140 square meters. After the range hood was turned on for 5 minutes, there was a foul smell, and the door was difficult to open. Because my mother was taking care of my daughter, after the range hood was on for 5 minutes, she would experience dizziness and tinnitus. To solve this problem, we had to open the entrance door and use the latch to hold the door open, leaving a small gap for air to Enter. The negative pressure in the room caused a series of problems. Opening the door required a lot of force. Later, I researched indoor negative pressure problems with my university colleagues and found that nearly 90% of households have this problem, especially the serious harm of intermittent negative pressure to the human body. Therefore, I started to develop the "Qianjia brand ventilation pressure balancing machine." This device is a patented invention that completely solves the problem of indoor negative pressure. It is especially suitable for homes ranging from 50 to 200 square meters. It uses an industrial-grade fully intelligent circuit board, which is safe and stable. When the indoor and outdoor pressure difference reaches 20pa, the constant pressure function is activated. It has two modes: winter and summer. In winter, it automatically heats the incoming air to prevent cold air from causing discomfort. It filters the incoming air, ensuring health. It also has an independent heating function and a natural gas leak ventilation alarm function to prevent the nearly 1,000 accidental deaths caused by natural gas leaks every year. The indoor and outdoor casing is made of stainless steel, which is beautiful and easy to install. The 90-millimeter wall hole diameter is compatible with air conditioners. From now on, say goodbye to negative pressure and enjoy the delicious food you cook. Qianjia Electric Appliances is committed to creating a new quality of life! Changchun Weicheng Mechanical Equipment Co., Ltd.

Qianjia ventilation constant pressure machine

Qianjia Ventilation Constant Pressure Machine Everyone has had this experience: when traveling, going out, or leaving home for a period of time, windows cannot be opened, otherwise there will be a lot of dust and it will be unsafe. Upon returning, you find that the indoor air is murky and has a foul odor, which takes a long time to dissipate even after opening windows and doors for ventilation. Or, if you encounter haze or strong winds, your mood will be completely ruined. What causes this? Whether in southern or northern buildings, there are centralized exhaust and drainage systems, which can cause negative pressure in the room. What is negative pressure? It is the phenomenon where the indoor air pressure is lower than the standard outdoor atmospheric pressure. Due to the principle of constant atmospheric pressure, low indoor air pressure will cause other air currents to supplement the indoor air, mainly through the drainage pipes, as other pathways are closed or have high wind resistance. The long-term accumulation of odors has a permeation effect, causing some clothes, bedding, and textiles to have odors, causing health hazards and seriously affecting the quality of life. The Qianjia ventilation constant pressure machine can easily solve the above problems. The fully automatic intelligent computer can measure the basic negative pressure in the room with an accuracy of one ten-thousandth (i.e., one atmospheric pressure is approximately 10030 Pa). A pressure difference of one Pascal is enough to activate the Jilin ventilation constant pressure system and filter the incoming air. In winter, it can also be used for heating and disinfection. (Refer to the instruction manual for specific operating methods.) Qianjia Electric Appliances, Warm and Comfortable Choose Qianjia, Happiness for the Whole Family Proudly presented by Changchun Weicheng Machinery Equipment Co., Ltd.

Why is the negative pressure phenomenon becoming increasingly severe?

Changchun Weicheng Machinery Equipment Co., Ltd. Why is the negative pressure phenomenon becoming increasingly serious? This needs to be discussed from two aspects. Firstly, the current living environment and building construction technology level are gradually improving, especially the window and door technology is becoming increasingly soundproof, airtight, and heat-insulating, which is quite different from the past. Others, such as the wall insulation performance, are also gradually improving, strengthening the airtightness invisibly. Secondly, the popularity of range hoods has become a standard configuration for almost every household, and the same is true for bathroom ventilation. When the windows and doors are closed in spring, autumn, and winter, and the range hood and exhaust fan are turned on, negative pressure will be instantly generated indoors, especially for the several major brands of range hoods such as Boss, Fotile, and Midea, which have under-range hoods, resulting in more negative pressure over 1000pa. So the problem is, the law of conservation of mass tells us that the air sucked out needs to be replenished (atmospheric pressure), so from where does it come in? All gaps leading to the outside are channels, so the doors are difficult to open, sewer odor may back up, the main supplementary airflow will enter the room, causing unpleasant odors inside and potentially spreading viruses, because the sewers are the concentrated sewage, mixing the sewage of a building. Many people are troubled by this and have bought many anti-odor floor drains to solve the problem of sewer odor backflow, but their effect is minimal, which is merely a temporary fix that does not address the root cause. Qianjia Appliances

Negative pressure hazards

Qianjia Appliances The many dangers of negative pressure Viruses spread through it Intermittent and repeated damage to the brain Memory decline and early tremors Unbearable room odor System negative pressure is like a devil Gas leaks can kill Qianjia protects a good life Changchun Qianjia Appliances

Qian Jia ventilation and constant pressure machine eliminates room odor

Many people have experienced this: after traveling, going out, or being away from home for a while, if windows are left unopened, a large amount of dust can accumulate, creating an unsafe environment. Upon returning, one often finds the indoor air to be murky and foul-smelling, taking a long time of airing the space to gradually eliminate the odor. This is especially frustrating during hazy or windy weather. What causes this? Both southern and northern buildings have centralized ventilation and drainage systems that can create negative pressure within the indoor environment.

Negative pressure fan

Negative pressure fans utilize the principle of air convection and negative pressure ventilation for cooling. They work by drawing in fresh air naturally from the opposite side of the installation location—a door or window—and quickly forcing out the stuffy indoor air, improving any poor ventilation issues. The cooling and ventilation effect can reach 90%-97%.

What is positive pressure, and what is negative pressure? What are their differences?

The use of positive pressure is commonly encountered in industrial applications, particularly when selecting miniature pumps (such as miniature booster pumps, miniature air pumps, miniature inflation/deflation pumps, miniature gas circulation pumps, miniature inflation pumps, miniature charging pumps, etc.).

Negative pressure ventilation

A fan (usually a negative pressure fan) installed on one wall of the space extracts some of the indoor air, causing the indoor air pressure to momentarily be less than atmospheric pressure or less than normal pressure. At this time, an air inlet is opened on the other side of the space (often opposite the negative pressure fan), and outside air automatically enters the space under atmospheric pressure. Therefore, a directional and stable airflow is formed in the space. This type of ventilation is usually called negative pressure ventilation. Its characteristics are directional and stable airflow, and it is connected to the outside world rather than internal circulation within the space.

Why does negative pressure occur in residential buildings?

Because the design of buildings didn't consider ventilation, current buildings have centralized water supply and drainage, and centralized smoke exhaust. Every household has a range hood and bathroom exhaust fan as standard equipment, and their power is increasing. Currently, the power of range hoods from brands such as Boss and Fotile reaches 1000Pa, with Meida's under-range hoods even higher. As the airtightness of doors and windows improves, the indoor-outdoor isolation also gets better. Therefore, when doors and windows are closed (especially in the spring, autumn, and winter in the north and summer in the south), negative pressure is immediately generated when the range hood is turned on.

The dangers of gas leaks?

The Ministry of Civil Affairs has officially announced that nearly 1,500 people die from gas poisoning and other accidental deaths in China each year. This is especially true in families that use gas stoves for heating, where the risk increases significantly during bathing. Poor ventilation and excessively high concentrations of carbon monoxide are the primary causes of asphyxiation deaths due to gas leaks.

What causes sewer odors and small flying insects inside the house?

This is a common problem in residential buildings today. When the range hood or exhaust fan is turned on, it creates negative pressure inside the room. Under the action of atmospheric pressure, the indoor and outdoor air pressure is balanced, and the air extracted by the range hood and exhaust fan is forcibly supplemented. Due to the strong sealing performance of doors and windows, it is difficult for air to Enter through the gaps, and can only Enter through the sewer pipes.