During the epidemic, many car companies are also contributing their share:
"On January 28, Jiangling Ford donated 10 negative pressure ambulances to Wuhan at the beginning of the epidemic, and SAIC Datsun also completed 60 negative pressure ambulances before February 5th.
Besides these manufacturers, many other car companies such as Yutong, Chirri Ruifu, Brilliance Jinbei, Fujian Benz, and Nanjing Iveco are also working overtime to complete the production, modification, and shipment of negative pressure ambulances."
This "invisible" battle, there are a lot of people or enterprises in the silent unity to pay, we firmly believe that the war against drugs we will eventually win! The country is going to win!
Back to business, what is the difference between a negative pressure ambulance and an ordinary ambulance? Can these technologies be used in civilian models? Also, can we build a positive-pressure passenger compartment?
Let's talk about this today
Why a negative-pressure ambulance
For airborne viruses or bacteria such as the new coronavirus, it is necessary to ensure that the air around them is clean, so the laboratory where they are studied is a negative-pressure laboratory.
By the same token, a normal ambulance used to transport non-infectious patients would not be as suitable, hence the negative pressure ambulance. Compared with a regular ambulance, the overall cost of a negative-pressure ambulance is about 40 percent higher, with a price tag of 600,000 yuan, including medical equipment.
Mercedes-Benz Vito negative pressure ambulance single-vehicle cost of about 500,000 yuan (excluding medical equipment)
Principle of negative pressure ambulance
From the name can also be seen, negative pressure, that is, the patient cabin inside the vehicle atmospheric pressure to be less than the cockpit and the outside of the vehicle atmospheric pressure, the outside of the vehicle air can be free to run to the vehicle, but the air inside the vehicle will not be "own" run to the vehicle. The air outside the car can freely run into the car, but the air inside the car will not run outside "by itself".
Of course, the principle is like this, but the internal design of a professional negative pressure ambulance is much more complicated.
First of all, according to the requirements of the State Ministry of Health, negative pressure ambulance patient compartment should be in the negative pressure value between -10Pa ~ -38Pa, at the same time, every hour the negative pressure layer of air needs to be replaced 20 times.
Will it pollute the surrounding air?
Of course not. According to the design requirements, the air discharged from the patient compartment has to pass through a high-efficiency filter, how efficient is it?
It filters 99.97% of bacteria or dust above 0.3 microns.
However, the average diameter of a new coronavirus like this one is about 0.1 microns, so 0.3 microns is not enough to prevent it? In fact, here, but also need to "exhaust air purification device" to help, what is this thing?
Exhaust air purification device integrated power exhaust, air filtration, ultraviolet sterilization / poison, negative pressure monitoring and alarm functions in one.
See, it filters and kills bacteria or viruses in the air, ensuring that the air discharged out of the negative pressure ambulance is free of viral contamination.
Will our car work?
After all this talk, you should now be able to understand that negative pressure is one of the methods used to prevent polluted air from escaping directly, as we, obviously, can not learn from. It's actually much more important to circulate the air in your car on an empty, deserted street.
What about driving with or without a mask? Does ultraviolet light kill toxins?
Click below to find out
Speaking of which, some people may ask, if the negative pressure is to prevent the air inside from flowing out, then if the car is positively pressurized, the outside air is not to come in?
Theoretically, yes indeed.
Isn't positive pressure a defense against poison?
Imagine: If the passenger compartment of the car can be made into a positive-pressure sterile laboratory or medical pressurized cabin, with the "air inlet purification device" to pressurize the car, the car's atmospheric pressure is theoretically higher than that outside the car atmospheric pressure.
Medical air pressurized cabin
Under these conditions, the unfiltered air outside the car can not enter the car environment, we do get a relatively isolated car environment.
Wait, isn't this the "biochemical defense mode" advertised by a car company? The use of HEPA filters and increased airflow from the vents is the same principle as a positive pressure lab.
In fact, even if the "defense mode" can really hit the passenger compartment to the positive pressure, its HEPA electrostatic air conditioning filter can not prevent an average of 100 nanometer size of the new crown virus.
The HEPA filter is rated at E11 or the equivalent of an N95 mask
Of course, many viruses attach themselves to dust, particles, aerosols, and other media, which can get trapped on the outside of the air conditioning filter.
So the air conditioning filter in your car could be an even greater source of germs if you don't do the appropriate antivirus work.
In this regard, let's hypothesize a little more about the development of virus-sized air conditioning filters, a sufficiently sealed cabin, and a set of high-airflow air conditioning vents.
And most importantly, a set of equipment that can sterilize the air-conditioning filter at high temperatures (at least 56 degrees Celsius or more) or ultraviolet light, so that our cars are isolated from viruses?
Give a hint: the temperature of the exhaust manifold of the internal combustion engine is more than 500 ℃, you fine
People, do you think this works? Do you have any more tips on how to protect yourself from driving? Open your mind, talk about it together~~
This article comes from the author of the automotive home, does not represent the views of the automotive home position.