When the pressure in the box is released to be less than the compression elastic force of the thin steel plate

 

The ND2 locomotive is an early diesel locomotive imported from Romania in the early 1970s. In the design of its diesel engine crankcase explosion-proof device, it is required that when the temperature and pressure of the oil and gas in the box rise and reach the set value due to certain abnormal conditions, several explosion-proof membranes arranged around the crankcase will be broken, causing high temperature, High-pressure oil and gas are released into the machine room to relieve the pressure in the box. However, if the continuous release of oil and gas in a short period of time causes the oil and gas to be filled in the machine room, it is very easy to cause a big explosion in the entire machine room and cause heavy losses. Therefore, the design of the protective device of the crankcase has a large defect. In recent years, ND2 locomotives have experienced 7 explosion accidents caused by the continuous release of oil and gas in the crankcase of the diesel engine. The crankcase was deformed by the explosion, the roof of the locomotive was blown up, and four explosions occurred during the operation of the locomotive. These explosions not only caused heavy losses to the locomotive, but also directly endangered driving safety.

ND2 locomotive diesel engine crankcase protection device and its working principle ND2 locomotive diesel engine is equipped with 2 sets of crankcase protection device, college of diesel locomotive major, bachelor degree, now engaged in diesel engine technology work. That is, explosion-proof valve and exhaust device. Explosion-proof valve The crankcase of ND2 locomotive diesel engine is equipped with 9 sets of explosion-proof valves, which are distributed around the crankcase. There is a 0.5mm thick arc-shaped thin steel plate between the explosion-proof valve cover and the intermediate body. The upper end of the steel plate is fixed on the explosion-proof valve by means of 3 bolts on the cover, and the lower end is pressed under the rectangular hole of the intermediate body by its own arc-shaped elastic force. The inside of the rectangular hole of the intermediate body is covered with a 0.05mm thick polyvinyl chloride fiber film, which separates the oil and gas in the crankcase from the atmosphere between the machinery outside the box. When the oil and gas pressure in the crankcase of the diesel engine rises to the set value due to some abnormal situation, the high-pressure oil and gas will break through the sealing film and open the thin steel plate to quickly release the high-pressure oil and gas in the box to the machine room outside the box. When the pressure in the box is released to less than the pressing elastic force of the thin steel plate, the thin steel plate is then pressed back to its original position, sealing the rectangular hole of the intermediate body, preventing the oil and gas in the box from continuing to diffuse between the machines.

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