High-pressure diaphragm compressor, oil replenishment system and oil replenishment method thereof

Abstract

The invention belongs to the field of diaphragm compressors, and relates to a hydrogen refueling station high pressure diaphragm compressor oil recharging system capable of controlling the rechargingtime, a high pressure diaphragm compressor and an oil recharging method. The oil recharging system comprises an oil recharging channel and an oil return channel; the two oil channels are connected inparallel; the oil return channel is connected between a plunger pump and a crankcase; oil overflow valves are mounted in the oil channels; the oil recharging channel is connected between the plunger pump and an oil cylinder; a check valve is mounted in the oil recharging channel and acts on the flow direction from the oil cylinder to the plunger pump; the oil overflow pressure of the oil overflowvalves is lower than the rated oil pumping pressure of the plunger pump and can be adjusted at any time; when the oil pressure in the plunger pump is higher than the oil overflow pressure, the plungerpump does not recharge the oil cylinder with oil, excess oil returns to the crankcase through the oil overflow valves, thus, the purposes of controlling the recharging amount and the recharging timeof the plunger pump are achieved, and the problems that the compressor gas displacement is reduced due to premature recharging or too long oil recharging time of the plunger pump, the service life ofdiaphragms and cylinder head strength are affected, and power consumption of the compressor is increased are solved.

Description

technical field [0001] The invention belongs to the field of diaphragm compressors, and in particular relates to a high-pressure diaphragm compressor oil replenishment system for a hydrogen refueling station capable of controlling the timing of oil replenishment, a high-pressure diaphragm compressor and an oil replenishment method. Background technique [0002] With the increasing tension of global energy sources, the development of green energy has become an inevitable trend in the world. Hydrogen is known as the clean energy with the most development potential in this century because its combustion only produces water and its abundant sources. Fuel cell vehicles powered by hydrogen have the advantages of environmental protection, high efficiency, zero pollution, and zero emissions. During the use and storage of hydrogen, if you want to continuously develop and use hydrogen technology, you must increase the pressure of hydrogen during use as much as possible. High-pressure...

AI Technical Summary

Problems solved by technology

When the working pressure of the plunger pump is high, for the former, when the hydraulic oil pressure in the cylinder is still high, the plunger pump will start to replenish oil into the cylinder, which is equivalent to reducing the downward stroke of the piston. It is very likely that the diaphragm cannot be fully deformed downward, which will affect the suction process of the compressor, and then affect the displacement of the compressor; When the hydraulic oil pressure in the oil cylinder rises to a higher level under the push of the piston, the plunger pump stops replenishing oil.

Regardless of whether the oil replenishment time is too early or the oil replenishment time is too long, for the plunger pump, it means that the amount of oil replenishment will be too much, which is equivalent to increasing the stroke of the piston when it goes up, making the piston less than At the outer dead center, the diaphragm is attached to the upper support plate of the cylinder head first. At this time, if the relief valve of the diaphragm compressor cannot discharge the excess hydraulic oil from the cylinder in time, the pressure of the hydraulic oil in the cylinder will be lower than that of the piston. The rapid rise under the action causes the diaphragm to generate greater additional stress, which affects the strength of the cylinder head of the diaphragm compressor and the life of the diaphragm

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