Diaphragm compressor follow-up valve

Abstract

The invention discloses a slave valve of a diaphragm-type compressor which solves problems of a conventional diaphragm-type compressor such as short service lifetime of a diaphragm of the slave valve, and easy damage to compressed gas by oil liquid due to the damaged diaphragm. The key points of the technical scheme are as follows: an air pressure piston is arranged in an air pressure valve; a hydraulic piston is arranged in a hydraulic valve; the air pressure piston and the hydraulic piston are respectively pressed against two sides of the diaphragm and opposite apply force to each other; the air pressure piston divides a sealing air inlet hole and an air pressure cavity; an oil inlet hole channel comprises a piston hole, a spring hole and an oil inlet, all of which communicate with each other in order; the piston hole communicates with a hydraulic cavity; the hydraulic piston divides a sealing piston hole and a hydraulic cavity; an oil return port of an externally-connected oil tank is arranged in a hole wall of the spring hole and communicates with the oil inlet; a spring seat used for communicating or enclosing the oil inlet and the oil return port is fixedly arranged on the hydraulic piston; the hydraulic piston is provided with a pressure-adjusting spring used for extruding the spring seat in a sleeving mode and the pressure-adjusting spring extrudes the spring seat so that communication between the oil inlet and the oil return port is enclosed by the spring seat.

Description

technical field [0001] The invention belongs to the field of gas compressors, more specifically, it relates to a novel structure for a follower valve in a diaphragm compressor. Background technique [0002] Diaphragm compressor is a volumetric compressor with a special structure. It is the highest-level compression method in the field of gas compression. It is the highest-level compression method in the field of gas compression. It has very good protection, and has the characteristics of large compression ratio, good air tightness, and compressed gas is not polluted by lubricating oil and other solid impurities. [0003] figure 1 It is a schematic diagram of the structure of the servo valve assembly of the diaphragm compressor in the prior art. The hydraulic oil enters one side of the diaphragm 3 through the oil port 10, and the compressed gas enters the other side of the diaphragm 3 through the air inlet 13. When the gas pressure is greater than the oil pressure at the oi...

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Problems solved by technology

[0004] The problem in the prior art is: the two ends of the diaphragm 3 in the diaphragm follow-up valve act on high-pressure gas and hydraulic oil, and repeatedly fold and fold under the change of the difference between the two forces, which may easily cause the diaphragm 3 to Damage, not only the diaphragm 3 needs to be made of special materials, the price is high, and the diaphragm 3 often needs to be replaced, in addition, once the diaphragm 3 is damaged, the oil is easy to mix into the compressed gas through the air inlet 13 and pollute the compressed gas

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