With thousands of builders working hard day and night, it took only 10 days to build a hospital with 1,000 beds dedicated to fighting the epidemic! The delivery of Huoshenshan Hospital demonstrates China's strong infrastructure construction and supporting capabilities. Companies and workers from all over the country are working behind the scenes to ensure the normal operation of Huoshenshan Hospital.
With the official delivery of Huoshenshan and Leishenshan hospitals, the two hospitals began to treat confirmed patients in large quantities. The new coronavirus has a strong transmissibility. It can be transmitted through droplets or aerosols (yet to be clarified), and it is easy to cause cross-infection during the transfer of patients. Although ordinary ambulances are equipped with complete treatment equipment, they cannot prevent the virus from spreading outside the vehicle. In order to deal with such special situations, negative pressure ambulances have appeared in people's sight. What is unique about negative pressure ambulances?
Negative pressure and positive pressure are the most common words used on engines. Negative pressure refers to the pressure below the atmosphere, and positive pressure, on the contrary, is the air intake side of the self-priming engine. It is negative pressure and the exhaust side is positive pressure. In industrial production, positive pressure is most commonly used. When the professor visited an engine factory last year, the person in charge of the factory said that the air pressure in the factory was about 1.5 times the atmospheric pressure.
Why is there positive pressure in the engine factory? Because the production process must be dust-free. However, in a factory so big, no one can guarantee 100% absolute sealing. The best way is to pump air (filtration) into the factory. As long as the air pressure in the factory is greater than the atmospheric pressure, the air will flow out. flow, external dust will not enter the factory.
The idea of ??the negative pressure ambulance is opposite to that of the engine factory. It thinks about how to keep dust (virus) in the factory (inside the car). In the fight against SARS and Ebola viruses, negative pressure ambulances have shown their talents and have been tested in actual combat.
The design standards for negative pressure ambulances are basically the same. The ambulance medical cabin is completely isolated from the cockpit, and the medical cabin is equipped with separate air intake and exhaust systems. The air intake system is installed on the top of the cabin and the exhaust system is installed on the bottom. The intake and exhaust systems are equipped with high-efficiency air filters, which can filter particles above 0.3 microns with a filtration efficiency of up to 99.9%, which is actually similar to N100 masks. The exhaled air will also be partially disinfected by ultraviolet light, and the air in the car will be discharged out of the car after being harmlessly treated.
The air intake volume of the medical cabin is 200 cubic meters/hour, and the exhaust volume is 400 cubic meters/hour. Since the exhaust volume is greater than the intake volume, the air pressure in the medical cabin is lower than the atmospheric pressure. Because the medical cabin needs to be fully disinfected, all corrosion-resistant materials are used inside. The interior of the higher-end medical cabin is made of stainless steel.
Although the medical cabin can prevent the virus from spreading outside the vehicle, medical staff will still come into direct contact with the patients. Therefore, the negative pressure ambulance will also be equipped with an isolation cabin. In the isolation cabin, patients can avoid physical contact with medical staff. touch. From the perspective of protective design, negative pressure ambulances provide comprehensive protection for both patients and medical staff. Like masks and protective clothing, negative pressure ambulances are indispensable tools in the fight against the new coronavirus. What is the current status of negative pressure ambulances? ?
Probably the most scarce material now is masks. Compared with masks, there are more upstream and downstream supporting companies for automobiles. Negative pressure ambulances are modified from ordinary ambulance chassis, and the production process is more cumbersome. As a medical facility currently in short supply, what is the current situation of negative pressure ambulances? The professor learned some information from the company that produces negative pressure ambulances.
Q1? How long does it take to produce a negative pressure ambulance?
The production cycle of a light passenger vehicle, that is, a base vehicle, takes about 10 days, and it takes 20 days to modify a negative pressure ambulance on the base vehicle chassis. The modification process is sequentially disassembly, welding, painting, and final assembly. According to the previous production cycle, it takes a month to produce a negative pressure ambulance. Due to the needs of the epidemic, various companies have worked overtime to produce, and now the production cycle of negative pressure ambulances has been compressed to 10 days.
Q2? With such a large domestic automobile production capacity, why does it take so long to produce a negative pressure ambulance?
In normal times, the demand for negative pressure ambulances is very small, and they are usually only used as local reserve supplies. In addition, the parts suppliers of negative pressure ambulances are relatively scattered, and some parts suppliers are even located in Hubei, the epicenter of the epidemic.
Affected by the epidemic, some areas have implemented controls, and some supporting companies for negative pressure ambulances are also in traffic control areas. With the coordination of the Ministry of Industry and Information Technology and local governments, these parts are transported to the production companies through railway transportation and other methods. Production has now resumed in full.
Q3? What is the production capacity of negative pressure ambulances?
There are many companies producing ambulances in China, but there are only a few companies producing negative pressure ambulances such as Jiangling, SAIC Maxus, Beiqi Foton and Brilliance Jinbei. Taking Jiangling as an example, it started production on January 24 and until February 5, it produced 53 negative pressure ambulances in one day.
After the outbreak, these companies received more than a thousand orders, and it is estimated that it will take some time to deliver them to local hospitals as soon as possible. Professor’s summary?
Now is a critical period in the fight against the new coronavirus. A series of actions taken by domestic car companies to help Wuhan reflect the car companies’ sense of social responsibility. In addition to aid funds and protective supplies, many car companies are trying to produce protective equipment. SAIC-GM-Wuling, BYD and GAC have begun producing masks. With the concerted efforts of enterprises across the country, I believe this epidemic will end as soon as possible. Come on, Wuhan!
This article comes from the author of Autohome Chejiahao and does not represent the views and positions of Autohome.