A hydraulic system and its gear pump

Abstract

The invention provides a hydraulic system and a gear pump thereof, and relates to the field of liquid variable volume machine. The hydraulic system comprises a hydraulic equipment, the gear pump and abypass valve block, wherein the gear pump comprises a pump shell provided with a liquid inlet channel and a liquid outlet channel, and a meshing gear, the bypass valve block is provided with a one-way valve, a pressure valve, an overflow valve and a hydraulic oil way. The hydraulic oil way is communicated with an oil outlet channel and subjected to the pressure of oil inside the hydraulic equipment, and the overflow valve core is drivingly connected to the pressure valve core. An oil outlet port of the hydraulic oil way is a step opening, and the overflow valve core is fit to the transition end face of the step opening. When the internal pressure of the hydraulic equipment is increased to a certain degree, the overflow valve core and the pressure valve core are pushed to synchronously move, so that the liquid inlet channel is communicated with the liquid outlet channel located on the upstream side of the one-way valve, the internal pressure intensity is reduced, the one-way valve is closed. In addition, the load of the meshing gear is greatly reduced and the energy consumption thereof is reduced accordingly in an environment with no pressure difference on the two sides or low pressure difference, compared with a situation the meshing gear directly bears the pressure intensity of hydraulic oil inside the hydraulic device.

Description

technical field [0001] The invention relates to the field of liquid displacement machinery, in particular to a hydraulic system and a gear pump thereof. Background technique [0002] The gear pump belongs to the positive displacement pump. The basic form is that two gears of the same size mesh with each other and rotate in a tightly fitted housing. The inner shape of the housing is similar to an "8" shape, and the two gears are respectively screwed into the cavities of each part. , The outer diameter of the gear is closely matched with the inner wall of the housing. Two closed spaces are composed of two gears, the shell and the front and rear covers. When the gears rotate, the volume of the space on the side where the gears are disengaged becomes larger, forming a vacuum and sucking liquid, and the volume of the space on the meshing side of the gears changes from large to small. Because the liquid cannot be compressed, the liquid is squeezed into the pipeline, and this phen...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a gear pump to solve the problem of high energy consumption

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