Pressure relief protection gear pump, manufacturing method and pressure relief protection method of pressure relief protection gear pump

Abstract

The invention relates to a pressure relief protection gear pump, a manufacturing method and a pressure relief protection method of the pressure relief protection gear pump. The pressure relief protection gear pump comprises a pump cavity which is internally provided with a driving gear and a driven gear, the driving gear and the driven gear are meshed with each other, and the portion, located on the top of the driving gear and the driven gear, of the pump cavity is provided with a floating valve which can be bounced off under the overload condition to relieve pressure. The pressure relief method of the gear pump includes the steps that when fluid entering the pump cavity causes the situation that the pump cavity pressure exceeds the elastic force of the floating valve, a valve piece is jacked up, and vacuum in the pump cavity disappears; and secondly, the fluid of the pump cavity flows back along an inlet of the pump cavity, and therefore the pump cavity pressure is released, and when the pump cavity pressure is smaller than the elastic force of the floating valve, the valve piece resets. The pump cavity has the self-protecting function; when the pressure in the pump cavity is overloaded, it is guaranteed that the floating valve piece can be bounced off to relieve pressure, and accidents of pump burst or motor burnout caused by overpressure can be avoided. By means of the manufacturing method, the technological process of production of the gear pump can be simplified so that cost can be reduced.

Description

technical field [0001] The invention relates to a fluid machine, in particular to a pressure relief protection gear pump, a manufacturing method and a pressure relief protection method thereof. Background technique [0002] The gear pump is a rotary pump that relies on the change and movement of the working volume formed between the pump cylinder and the meshing gear to transport liquid or pressurize it. The existing gear pump generally consists of two gears, a pump body and a front and rear cover to form two closed spaces. When the gears rotate, the volume of the space on the side of the gear disengagement increases from small to large, forming a vacuum, sucking the liquid, and the gear on the meshing side. The volume of the space changes from large to small, and the liquid is squeezed into the pipeline. Discharging the liquid is to relieve the pressure of the internal space. When the pressure received by the gear pump is overloaded, the pump will burst or the motor will b...

AI Technical Summary

Problems solved by technology

Its shortcoming is: can't solve the problem that the pressure overload of the gear pump causes the pump to burst or the motor burns out

The traditional high-pressure gear pump design must process a metal cavity with a washing bed. In addition to the complicated process and high cost, based on the principle of the gear pump, the part that really has a vacuum effect is actually only half of the cavity

The gear cavity is mostly closed by fixed front and rear covers, so that when the vacuum pump body forms an overpressure, accidents such as pump burst or motor burnout are prone to occur

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