Spiral reciprocating type hydraulic piston pump

Abstract

A spiral reciprocating type hydraulic piston pump comprises an outer shell, and an oil suction port and an oil discharge port are formed in the outer wall of the outer shell. A pump cavity is defined by the left end cover, the outer shell and the right end cover jointly, and an inner shell lining is arranged in the pump cavity. N / 2 first kidney-shaped oil ports and n / 2 second kidney-shaped oil ports are formed in the left section and the right section of the inner shell lining correspondingly; a left piston, a flow distribution cylinder body and a right piston are arranged in the inner shell lining, n rectangular grooves are evenly distributed in the flow distribution cylinder body in the circumferential direction, and the rectangular grooves are divided into the left rectangular groove and the right rectangular groove. A left oil suction and discharge cavity is defined by the left piston, the flow distribution cylinder body and the cylindrical plunger, and a right oil suction and discharge cavity is defined by the cylindrical plunger, the flow distribution cylinder body and the right piston. The left rectangular groove and the right rectangular groove in the flow distribution cylinder body are communicated with the first kidney-shaped oil port and the second kidney-shaped oil port in the inner shell lining correspondingly, the oil cavity with the gradually-increased volume absorbs oil, and the oil cavity with the gradually-decreased volume discharges oil. The hydraulic pump is simple in structure and low in manufacturing cost, and compared with a hydraulic pump with the same displacement, the size is greatly reduced.

Description

technical field [0001] The invention relates to the field of fluid transmission and control, in particular to a helical reciprocating hydraulic piston pump. Background technique [0002] The hydraulic pump is an indispensable core power component in the hydraulic system, and its performance directly affects the stability and reliability of the hydraulic system. In recent years, my country's aviation, aerospace, navigation and other fields have developed rapidly. These high-tech and high-precision fields have put forward higher requirements for the performance of hydraulic pumps. [0003] The traditional plunger pump has a large number of internal parts, high manufacturing process requirements, and complex structure; it is sensitive to oil pollution, and the maintenance cost is relatively high. In addition, there are three pairs of friction pairs in the traditional plunger pump. There are many friction pairs, which will be affected by the PV value. (the product of pressure a...

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Problems solved by technology

[0003] The traditional plunger pump has a large number of internal parts, high manufacturing process requirements, and complex structure; it is sensitive to oil pollution, and the maintenance cost is relatively high. In addition, there are three pairs of friction pairs in the traditional plunger pump. There are many friction pairs, which will be affected by the PV value. (the product of pressure and speed), in the state of high-speed motion, when the centrifugal force moment of the plunger shoe is greater than the spring moment of the cylinder body, the cylinder body will overturn, and the gap between the cylinder body and the valve plate will become larger. , there will be leakage and loss of pressure, which will seriously affect the performance of the plunger pump and the stability of the hydraulic system, so the traditional plunger pump is not suitable for high-speed operation

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