Self-cooling structure for cylinder of swashplate type plunger pump

Abstract

The invention relates to a self-cooling structure for a cylinder of a swashplate type plunger pump. The self-cooling structure comprises the cylinder and a flow-distribution plate, wherein plunger cavities are formed in the front end surface of the cylinder, kidney-shaped holes communicated with the plunger cavities are formed in the back end surface of the cylinder, the back end surface of the cylinder is closely attached to the flow-distribution plate, axial cooling oil channels are formed in the cylinder, radial cooling oil channels for communicating the axial cooling oil channels with the outer circumferential surface of the cylinder are formed in the circumferential side of the cylinder, flow-distribution cooling oil channels for communicating the axial cooling oil channels with the back end surface of the cylinder are formed in the back end surface of the cylinder, an arc through hole-shaped low-pressure oil sucking area and high-pressure oil discharge areas are formed in two sides of a same end surface of the flow-distribution plate, oil grooves are formed between the low-pressure oil sucking area and the high-pressure oil discharge areas, and the plunger cavities are communicated with the low-pressure oil sucking area and the high-pressure oil discharge areas through the kidney-shaped holes. Under the action of the rotating centrifugal force of the cylinder and the pressure difference of the outer circumferential surface of the cylinder, the cooling efficiency is effectively improved; the specific oil grooves of the flow-distribution plate and the cooling oil channels of the cylinder are formed, and the cooling efficiency and reliability are further improved.

Description

technical field [0001] The invention relates to a cylinder self-cooling structure of a swash plate type plunger pump, in particular to a swash plate type plunger pump which can realize self cooling of the cylinder body under high-speed rotation. Background technique [0002] The swash plate plunger pump is widely used in aerospace, petrochemical, construction machinery and shipbuilding industries due to its advantages of compact structure, high power density ratio, high pressure and high efficiency, and flexible variable mode. At present, with the development of high-pressure axial piston pumps, the heat generated by the three main friction pairs (piston pair, flow distribution pair and sliding shoe pair) of the swash plate axial piston pump has further increased, and its working heat has accumulated It will increase the friction pair and cause damage such as sticking, which will greatly reduce the service life of the pump. [0003] For the plunger pair, the reciprocating m...

AI Technical Summary

Problems solved by technology

This solution increases the leakage of the gap and reduces the efficiency of the pump. At the same time, the high-pressure leakage of the gap will also increase the heat of the pump.

In addition, at high speed, the plunger is subjected to a large centrifugal force and is close to the radially outer side of the cylinder body. In fact, the gap between the plunger and the radially outer side of the cylinder body cannot be effectively increased.

[0007] (2) Heat dissipation fins are added to the outer peripheral surface of the cylinder, which intensifies the agitation heat and rotation resistance of the cylinder itself

Under high-speed and high-pressure working conditions, the plunger is strengthened by centrifugal force and high pressure, and the contact pressure on the cylinder increases. If the rigidity of the cylinder is insufficient, the cylinder is easily deformed, thereby increasing the size of the plunger and the plunger cavity. gap, and eventually lead to a rapid increase in the pump due to internal leakage

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