Fluid end device of plunger pump

Abstract

The invention relates to a fluid end device of a plunger pump. The fluid end device of the plunger pump comprises a pump head body (3), a cartridge combination valve (12), a stuffing box (7) and a plunger (10). The pump head body (3) is provided with a suction inlet and an exhaust outlet, and the cartridge combination valve (12) is arranged inside the pump head body (3); a liquid inlet cavity (1213) communicated with the suction inlet and a liquid outlet cavity (1215) communicated with the exhaust outlet are formed between the pump head body (3) and the cartridge combination valve (12); the end surface of the stuffing box (7) is closely adhered to the pump head body (3), and the plunger (10) can move inside the stuffing box (7) in a reciprocating mode; the cartridge combination valve (12) comprises a pressing sleeve (1201), a valve core (1206), a suction valve (1208) and a discharge valve (1205). The fluid end device of the plunger pump improves the overflowing performance of the combination valve and the guide performance between the suction valve and the valve core and meanwhile is compact and simple in structure; the pump head body is small in size; the fluid end device of the plunger pump is high in volume efficiency, easy to assemble and disassemble and rapid in maintenance and replacement.

Description

technical field [0001] The invention relates to the field of reciprocating plunger pumps, in particular to a liquid end device of a plunger pump. Background technique [0002] The structure of the reciprocating plunger pump consists of two parts, one is the fluid end, the other is the power end, and the fluid end is the working part of the reciprocating high-pressure plunger pump, which is used to transport liquid and convert mechanical energy into liquid pressure energy. At present, the common hydraulic end of the plunger pump has a valve group divided into a split valve group and a combined valve group. [0003] The hydraulic end layout of the split valve group includes traditional "L" type, reverse "L" type, "V" type, "Y" type, and "+" type liquid end. First of all, the suction valve and discharge valve of the split valve group are arranged separately, with many parts and complex structure, which is not easy to disassemble and assemble, which makes maintenance and replac...

AI Technical Summary

Problems solved by technology

First of all, the suction valve and discharge valve of the split valve group are arranged separately, with many parts and complex structure, which is not easy to disassemble and assemble, which makes maintenance and replacement inconvenient; secondly, there are intersecting holes in the pressure alternating chamber of the pump head body, and the , under frequent alternating pressure, the parts with high stress on the pump head body are easy to be damaged, and its service life is easily reduced; thirdly, a large clearance volume will be formed between the suction valve, discharge valve and plunger, and the volumetric efficiency There is still room for improvement

[0004] The existing combined valve fluid end has the following disadvantages. First, the flow area of ​​the combined valve group is small, and the lift of the valve plate needs to be increased in order to increase the flow rate, which leads to the closing speed, acceleration, impact force, and noise of the valve plate. And the closing lag angle will increase, which seriously affects the service life and volumetric efficiency of the valve group; second, the various parts of the fluid end are connected by multiple sets of bolts, which is inconvenient to disassemble; third, the axial dimension of the combined valve is large, resulting in Large pump head body size and increased weight

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