CN111237151A

CN111237151A - Axial plunger pump sliding shoe with surface texture

Info

Publication number: CN111237151A
Application number: CN202010204322.3A
Authority: CN
Inventors: 马旋; 孟祥旭; 卢熙群; 李彤阳; 焦博文; 孙文; 王永强
Original assignee: Harbin Engineering University
Current assignee: Harbin Engineering University
Priority date: 2020-03-21
Filing date: 2020-03-21
Publication date: 2020-06-05

Abstract

The invention relates to an axial plunger pump sliding shoe with a surface texture, which comprises a sliding shoe body, wherein the sliding shoe body is provided with an upper end surface and a lower end surface which are opposite, the upper end surface is provided with a sliding shoe ball socket, the lower end surface is provided with an oil chamber, the oil chamber is positioned in the center of the lower end surface, the ball socket is communicated with the oil chamber through an oil through hole, a sealing strip is arranged between the oil chamber and the outermost ring of the lower end surface of the sliding shoe body, the lower end surface of the sliding shoe body is provided with an annular groove texture, and the annular groove texture is arranged from the middle of the sealing strip to two sides. According to the invention, the annular groove texture is processed on the bottom surface of the sliding shoe, so that the oil film bearing capacity at the sliding shoe friction pair can be improved, the viscous friction force and the friction torque are reduced, the mechanical loss is reduced, the dynamic pressure lubrication effect is enhanced, and the method has important significance for reducing the abrasion and prolonging the service life of the sliding shoe friction pair.

Description

Axial plunger pump sliding shoe with surface texture

Technical Field

The invention relates to the field of engineering hydraulic machinery, in particular to a part of an axial plunger pump, and particularly relates to an axial plunger pump sliding shoe with a surface texture.

Background

Because the axial plunger pump has the advantages of high working pressure, easy variable adjustment, large rotating speed range, high efficiency and the like, the axial plunger pump is widely applied to the fields of ship industry, aerospace, machine tool industry, energy industry machinery, light textile machinery and the like, and the problems of friction reduction and service life extension of the pump are very urgent along with the development of the high-pressure plunger pump towards high pressure, high speed and large flow.

The slipper friction pair composed of the slipper and the swash plate is one of three large friction pairs of the axial plunger pump. In the working process, the movement form of the sliding shoes comprises axial movement along with the plunger and circumferential movement clinging to the surface of the swash plate, the sliding shoes incline under the action of overturning moment to form a wedge-shaped oil film with the swash plate, and the bearing capacity of the sliding shoes comprises two parts, namely static pressure supporting force generated by high-pressure oil and a hydrodynamic pressure field generated in the movement process of the sliding shoes. For the wedge-shaped flow field, the oil film generated by the fluid dynamic and static pressure mixed support has more complex characteristics, and the sliding shoe is easy to generate friction and wear.

The sliding shoes have high moving speed and are frequently subjected to periodic pressure impact and high contact specific pressure, so that the sliding shoe friction pair is easy to cause lubrication failure, serious abrasion and even burning loss of the sliding shoes. In addition, the working environment of the high-pressure plunger pump is severe and is in working conditions of high speed, high pressure, high temperature and the like for a long time, so that the lubricating state of the sliding shoe friction pair becomes very severe, for example, the overturning motion of the sliding shoe influences the stability of oil film bearing of the sliding shoe friction pair, and the sliding shoe is worn and loses efficacy; the relative movement speed between the sliding shoe and the swash plate is high, a large amount of friction heat is easy to generate, the power loss of the pump is increased, the temperature of an oil film is increased, the viscosity of the oil film is reduced, and the lubricating performance of the sliding shoe friction pair is reduced. Therefore, the improvement of the dynamic pressure lubrication performance of the sliding shoe friction pair has important significance.

Experts at home and abroad have long studied the inherent problems of the axial plunger pump, and most of the research focuses on seeking anti-wear and self-lubricating materials. From the current research and engineering practice, the research on materials is relatively complete, and breakthrough progress cannot be achieved in a short time. Therefore, reasonable structural design must be adopted to improve the working performance of the sliding shoe friction pair.

Disclosure of Invention

The invention aims to solve the tribological problem of a sliding shoe friction pair to a certain extent. Therefore, the invention provides the axial plunger pump sliding shoe friction pair with the annular groove texture, which has the advantages of good dynamic pressure lubrication effect, small mechanical loss and high volume efficiency under the working conditions of high speed and heavy load in an oil lubrication environment. The invention is based on a static pressure bearing design method, and the lower end surface of a sliding shoe friction pair of an axial plunger pump is processed into a surface with an annular groove texture.

The invention is realized by the following technical scheme:

the axial plunger pump piston shoe with the surface texture comprises a piston shoe body, wherein the piston shoe body is provided with an upper end surface and a lower end surface which are opposite, a piston shoe ball socket is arranged on the upper end surface, an oil chamber is arranged on the lower end surface, the oil chamber is positioned in the center of the lower end surface, and the ball socket is communicated with the oil chamber through an oil through hole; and a sealing belt is arranged between the oil chamber and the outermost ring of the lower end surface of the slipper body, an annular groove texture is arranged on the lower end surface of the slipper body, and the annular groove texture is arranged from the middle of the sealing belt to two sides.

As a preferable technical scheme of the invention, the width w of the annular groove texture is between 1.0 and 2.0mm, and the depth h is between 10 and 30 mu m.

Compared with the prior art, the invention has the following advantages:

according to the static pressure bearing design method, the lower end face of the sliding shoe is designed to be a surface with an annular groove texture, the annular groove texture and a sealing belt form a step plane, and the knowledge of hydrodynamics shows that the step plane has stronger dynamic pressure capacity compared with planes in other shapes; under the action of the step effect, the anti-overturning moment generated by an oil film pressure field can be better ensured, and the working reliability of the sliding shoe is enhanced. Compared with the piston shoes without the annular groove texture, the piston shoes with the annular groove texture have the same posture, and because the annular groove texture increases the gap liquid resistance, the radial flow of the bottom oil chamber along the sealing belt is reduced, the pressure of the oil chamber is improved to a certain extent, namely the static pressure supporting force is increased, and the piston shoes with the annular groove texture can well meet the design requirement of dynamic pressure lubrication of the piston shoes.

The invention improves the dynamic pressure lubrication performance of the sliding shoe friction pair only through the structural design without adding parts, and has the advantages of simple structure and good economical efficiency. In addition, this structure still has extensive applicability's characteristics, can choose for use the annular slot of equidimension not to the operating mode of difference to guarantee that the piston shoes have excellent working property.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a bottom view of FIG. 1;

fig. 3 is an assembly view of the present invention.

In the figure: 1-a slipper body; 2-a slipper socket; 3-oil chamber; 4-oil through holes; 5-ring groove texture; 6-sealing tape; 7-a plunger; 8-a swash plate; 9-cylinder bore; 10-plunger ball head.

Detailed Description

The invention is described in more detail below with reference to the accompanying drawings:

in order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are intended to be illustrative only and are not intended to be limiting.

The embodiment provides an axial plunger pump sliding shoe with a surface texture, which comprises a sliding shoe body 1, wherein the sliding shoe body 1 is provided with an upper end surface and a lower end surface which are opposite, the upper end surface is provided with a sliding shoe ball socket 2, the lower end surface is provided with an oil chamber 3, the oil chamber 3 is positioned in the center of the lower end surface, the ball socket 2 is communicated with the oil chamber 3 through an oil through hole 4, a sealing strip 6 is arranged between the oil chamber 3 and the outermost ring of the lower end surface of the sliding shoe body, the lower end surface of the sliding shoe body is provided with an annular groove texture 5, and the annular groove texture 5 is formed from the middle of the sealing strip 6 to two sides.

The axial plunger pump sliding shoe of a groove structure, its characterized in that: the width w of the annular groove 5 is 1.0-2.0 mm, and the depth h is 10-30 mu m.

Fig. 3 is an assembled state view of the present invention. During the use process of the piston shoes, a plunger ball head 10 is assembled with a ball socket 2 of a piston shoe body, a plunger 7 is installed in a cylinder hole 9, meanwhile, the piston shoe body is installed on a swash plate 8, in the working process, the high-pressure oil acting force born by the plunger is transmitted to the swash plate through the piston shoes, and the plunger 7 reciprocates in the cylinder hole 9 under the reaction force of the swash plate 8 to the piston shoe body 1. Because the lower end face of the sliding shoe is provided with the annular groove texture, the oil film bearing capacity can be improved, the viscous friction force and the friction torque can be reduced, the mechanical loss can be reduced, and the dynamic pressure lubrication effect can be enhanced.

According to the invention, the annular groove texture is processed on the bottom surface of the sliding shoe, so that the oil film bearing capacity at the sliding shoe friction pair can be improved, the viscous friction force and the friction torque are reduced, the mechanical loss is reduced, the dynamic pressure lubrication effect is enhanced, and the method has important significance for reducing the abrasion and prolonging the service life of the sliding shoe friction pair.

The above description is only a preferred embodiment of the present invention and should not be taken as limiting the invention, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Axial plunger pump piston shoe with surface texture, including piston shoe body (1), piston shoe body (1) have relative up end and lower terminal surface, the up end have a piston shoe ball socket (2), lower terminal surface have an grease chamber (3), grease chamber (3) are located the lower terminal surface center, ball socket (2) with grease chamber (3) through leading to oilhole (4) intercommunication, grease chamber (3) with piston shoe body lower terminal surface between the outer lane be sealing band (6), its characterized in that:

an annular groove texture (5) is arranged on the lower end face of the sliding shoe body;

the annular groove texture (5) is arranged from the middle of the sealing belt (6) to two sides.

2. The surface textured axial plunger pump shoe of claim 1, wherein: the width w of the annular groove texture (5) is 1.0-2.0 mm, and the depth h is 10-30 mu m.