Method and device for preventing plunger pump from sucking air

Abstract

The invention discloses a method for preventing a plunger pump from sucking air. In the method, one-way connection between a shell cavity of the plunger pump and an oil suction channel of a rear cover can lead the hydraulic oil in the shell cavity to enter into the oil suction channel for supplementing oil after a negative pressure appears in the oil suction channel, thus the oil suction channel of the plunger pump can be prevented from sucking air. According to the method provided by the invention, the one-way connection mode is used between the shell cavity of the plunger pump and the oil suction channel of the rear cover, which can lead the hydraulic oil in the shell cavity to enter into the oil suction channel for supplementing oil after a negative pressure appears in the oil suction channel, thus the oil suction channel of the plunger pump can be prevented from sucking air; meanwhile, the cavitation phenomenon can be avoided, the service life can be substantially prolonged and the maintenance cost can be reduced. The method provided by the invention can also improve the integration level of the device, effectively decrease the installation space and reduce the production cost, is convenient to use, use fewer components and has relatively simple implement structure. Besides, the valve core with a check valve device is oriented by a guide pin and is provided with pressing force by a spring so that the valve core and the limited block can fully contact and be packed, therefore, the sealing performance is good.

Description

technical field [0001] The invention relates to a method and device for preventing cavitation, in particular to a method and device for preventing cavitation of a hydraulic plunger pump. Background technique [0002] The hydraulic plunger pump generally includes a housing and a back cover connected to the housing. A rotating assembly with a distribution plate is installed in the housing cavity of the housing, and an oil suction channel connected to the housing cavity is opened on the back cover. During the working process of the hydraulic plunger pump, there will inevitably be instantaneous negative pressure in the oil suction channel. Frequent negative pressure will make the contact surface of the pump valve plate and cylinder block loose and peel off, that is, cavitation phenomenon, which requires the oil suction channel pressurization, but at present, many main engines cannot realize closed pressurization of the oil tank connected to the oil suction channel, so that cavit...

AI Technical Summary

Problems solved by technology

During the working process of the hydraulic plunger pump, there will inevitably be instantaneous negative pressure in the oil suction channel. Frequent negative pressure will make the contact surfaces of the pump valve plate and cylinder body loose and peel off, that is, cavitation phenomenon, which requires the oil suction channel pressurization, but at present, many main engines cannot realize closed pressurization of the oil tank connected to the oil suction channel, so that cavitation will occur in the hydraulic plunger pump during use, thus reducing the service life of the hydraulic plunger pump and improving maintenance. cost

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