Reciprocating pump body explosion problem
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Oil-free vertical vacuum pump, wlw-100bc, has been giving me a big headache these days. Two pumps broke down in a row with the same "death method". The third picture is the first time it broke, and the first picture is the second time it broke. After the first failure, I replaced an old vacuum pump, but it broke within a day! What is the reason? Please help me analyze it! First: There is a problem with the pipeline of this pump, because the vacuum inside is steam with part of methylene chloride, so it is easy to condense into raindrops at the outlet and flow back into the pump chamber (our outlet pipelines are all facing upwards - a common problem). In the end, the raindrops are easy to seal along the packing. It flows into the crankcase below to emulsify the oil - but this is not the root cause. The second reason is that the piston rod is not adjusted properly, causing the piston rod-connector-connecting rod section to be too long, causing the reciprocating motion to conflict with the cylinder head, eventually causing the upper window to burst. The third problem is that the inlet temperature is too high, 80 degrees Celsius, and the water cooling is too low. After encountering it, it quickly turns into raindrops and eventually enters the crankcase. Do you have any good solutions? I've added a downward pipe at the outlet and a surge tank
You can put a rubber retaining ring on the connecting rod to prevent the condensate above from flowing into the crankcase along the connecting rod. The pin hole can be machined or a relaxation pad can be used to prevent the connecting cap from loosening and causing the piston rod stroke to become longer. If liquid accumulates at the outlet, a vapor-liquid separation tank and an automatic drain valve can be added.
Can't it be replaced by another vacuum pump?
Water ring pumps are the most suitable, but environmental protection is now strictly enforced. Only use vacuum pump
The stuffing box above serves this purpose. I have set up a buffer tank for the outlet.
1. Reduce the inlet temperature of the vacuum pump and improve the heat exchange effect of the heat exchanger in front of the pump.； 2. Add gas-liquid separator before pump ； 3. The pump outlet pipeline should be lower than the pump outlet, and a gas-liquid separator should be installed. If you want to reduce consumption, a heat exchanger can be attached to the separator.
It should be that the cylinder is jacked up, and the outer dead center gap is small or filled with fluid. Then check to see if the exhaust valve is stuck.
Isn’t it enough to just put water cooling + cryogenic + buffer tank into the pump?
They were all blown up like this, and they looked quite dangerous. Try another pump. The effect should be much better than reciprocating
What you said has been changed, but there are too many manufacturers with this design, and other plans have already been changed. Except for that heat exchanger. This heat exchanger is not expensive per unit. But we have so many of them, we can’t add them all.