CN219587974U

CN219587974U - Bearing bush for plunger pump

Info

Publication number: CN219587974U
Application number: CN202320352930.8U
Authority: CN
Inventors: 宋超雄; 赵向阳; 朱义展
Original assignee: Changsha Chaoxiong Machinery Technology Co ltd
Current assignee: Changsha Chaoxiong Machinery Technology Co ltd
Priority date: 2023-03-01
Filing date: 2023-03-01
Publication date: 2023-08-25
Anticipated expiration: 2033-03-01

Abstract

The utility model discloses a bearing bush for a plunger pump, which comprises a bearing bush substrate, wherein the inner side of the bearing bush substrate is provided with an inner contact surface, and the inner contact surface is of a hollow cylinder structure; the inner contact surface is internally formed with a plurality of circumferentially arranged oil grooves in the hollow cylinder structure, and the oil grooves are arranged at intervals in the axial direction of the bearing bush base body; the bearing bush base body is also provided with an oil hole communicated with the oil groove; the inner contact surface is provided with arc-shaped outer expansion edges at the outer edges of two sides of the hollow cylinder structure, an annular groove is formed on the arc-shaped outer expansion edges, a polyether-ether-ketone ring is embedded in the annular groove, and the polyether-ether-ketone ring has an inner diameter smaller than the diameter of the inner contact surface. The utility model can effectively improve the assembly performance of the connecting rod shaft/the plunger shaft lever on the plunger pump, ensure the service performance and prolong the service life of the plunger pump.

Description

Bearing bush for plunger pump

Technical Field

The utility model relates to the technical field of mounting accessories of plunger pumps, in particular to a bearing bush for a plunger pump.

Background

The plunger pump is used as an important device of a hydraulic system, and the plunger pump is used for realizing the suction and pumping of pumping media by means of the reciprocating motion of the plunger in the cylinder body to change the volume of the sealed working cavity, has the advantages of high rated pressure, compact structure, high pumping efficiency, convenient flow regulation and the like, and is widely applied to occasions where high pressure, high flow and flow are required to be regulated, such as hydraulic machines, engineering machinery and ships.

In general, in a plunger pump, a plunger body is driven to reciprocate by providing power by eccentric rotation of a pump shaft, in order to ensure sealing performance and motion accuracy of a plunger, a sliding bearing is generally adopted in the plunger pump in the prior art to assist in assembling a connecting rod shaft/plunger shaft of the plunger, wherein the sliding bearing is a part where the sliding bearing is in contact with the shaft, the usability of the sliding bearing is directly affected, and in consideration of the fact that the traction of the pump shaft of the plunger pump has eccentric motion, small radial vibration exists in the sliding bearing in addition to axial reciprocating motion of the connecting rod shaft/plunger shaft correspondingly connected with the sliding bearing, so that the sliding bearing on the plunger pump needs to bear continuous and high-frequency alternating load impact. In the prior art, a bearing bush structure specially designed for a plunger pump movement mode is not available, and the defect of low service life exists under the stress characteristic condition by adopting the traditional sliding bearing bush structure.

Disclosure of Invention

The technical problem solved by the utility model is to provide a bearing bush for a plunger pump, which can be used for solving the defects in the technical background.

The technical problems solved by the utility model are realized by adopting the following technical scheme:

the bearing bush for the plunger pump comprises a bearing bush base body, wherein the inner side of the bearing bush base body is provided with an inner contact surface, and the inner contact surface is of a hollow cylinder structure;

the inner contact surface is internally formed with a plurality of circumferentially arranged oil grooves in the hollow cylinder structure, and the oil grooves are arranged at intervals in the axial direction of the bearing bush base body; the bearing bush base body is also provided with an oil hole communicated with the oil groove; the inner contact surface is provided with arc-shaped outer expansion edges at the outer edges of two sides of the hollow cylinder structure, an annular groove is formed on the arc-shaped outer expansion edges, a polyether-ether-ketone ring is embedded in the annular groove, and the polyether-ether-ketone ring has an inner diameter smaller than the diameter of the inner contact surface.

By way of further limitation, the bushing substrate is formed from a babbitt alloy or a copper-based alloy.

By way of further definition, the bearing shell substrate is formed with an antiwear structural coating on an inner surface corresponding to the inner contact surface.

As a further limitation, the inner contact surface is also formed with an oil guide grid, the oil guide grid is connected with the oil groove and is of a rhombic space circulation structure, and the oil guide grid is formed in an inner contact surface area between annular grooves on two sides of the inner contact surface;

the grid groove depth on the oil guide grid is 1/3-1/2 of the groove depth of the oil groove.

By way of further limitation, the number of annular grooves and the polyether-ether-ketone rings on the single-sided arc-shaped outer expansion is two, and the two polyether-ether-ketone rings have flush inner diameter surfaces after assembly.

By way of further limitation, the annular groove has an inverted trapezoidal base structure in the ring cross section, and the polyetheretherketone ring is detachably mounted in the annular groove in an interference fit.

The beneficial effects are that: the bearing bush for the plunger pump has better adaptability to the operation stress of the plunger pump shaft conducted to the connecting rod shaft/plunger shaft rod in the operation process of the plunger pump, can be in impact-resistant contact with the connecting rod shaft/plunger shaft rod of the plunger pump through the combination of the arc-shaped outer expansion edge and the polyether-ether-ketone ring, so as to offset and buffer the impact of alternating load generated in the process of driving the connecting rod shaft/plunger shaft rod to reciprocate by the pump shaft on the plunger pump, further improve the operation stability of the pump shaft of the plunger pump, and meanwhile, the inner side of the bearing bush forms the lubrication contact of a full contact surface through the combination of the oil guide grid arranged in a diamond grid shape and the oil groove, and can effectively ensure the working stability and the service life of the bearing bush by matching with the sealing of the polyether-ether-ketone ring.

Drawings

Fig. 1 is a longitudinal sectional structural pattern diagram of a preferred embodiment of the present utility model.

Wherein: 1. arc-shaped outer expansion edges; 2. a polyetheretherketone ring; 3. a bearing bush base; 4. an oil groove; 5. an oil guiding grid; 6. and an oil hole.

Detailed Description

The utility model is further described with reference to the following detailed drawings in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the implementation of the utility model easy to understand.

Referring to a preferred embodiment of a bearing bush for a plunger pump of fig. 1, in this embodiment the bearing bush is used in the structural assembly of a single plunger pump for cooperating with a sliding bearing to provide guiding assistance for the plunger shaft of the plunger pump.

The bearing bush comprises a bearing bush base body 3 formed by Babbitt metal, wherein the whole bearing bush base body 3 is of a hollow cylinder structure, and an antiwear structure coating is formed on the inner surface, and in the embodiment, the antiwear structure coating is a antiwear alloy coating and is formed on the inner surface of the bearing bush base body 3 by a powder metallurgy process.

The bearing bush matrix 3 comprises an upper bearing bush and a lower bearing bush which are matched with each other, the upper bearing bush and the lower bearing bush are opposite in structure, and the two sides of the upper bearing bush and the lower bearing bush are provided with assembling parts for fixed matched installation; the semi-circular inner walls of the upper bearing bush and the lower bearing bush form an inner contact surface after assembly, the inner contact surface is integrally in a straight cylinder shape, two oil grooves 4 which are annularly arranged are formed in the axial direction, and a plurality of oil holes 6 communicated with the oil grooves 6 are formed in the annular surface of the bearing bush base body 3 to supply lubricating oil for the oil grooves 4.

The bearing bush base body 3 is formed with arc-shaped outer expanded edges 1 at the end surfaces of the two ends of the inner contact surface, and the inner contact surface is continuously increased from the center of the bearing bush base body 3 to the outer inner diameter at the positions of the arc-shaped outer expanded edges 1.

The inner contact surface is formed between the arc-shaped outer expanded edges 1 at two ends, and the oil guide grid 5 is in a diamond blind groove grid structure in the embodiment, the inner contact surface at the inner side of the arc-shaped outer expanded edges 1 is evenly spread, the blind groove width of the oil guide grid 5 is 1/5 of the groove width of the oil groove 4, and the groove depth is 1/3 of the groove depth of the oil groove. The lubricating oil entering the oil groove 4 through the oil holes 6 is uniformly guided through the oil guiding grid 5 to contact and cover the inner contact surface.

The bearing bush base body 3 is provided with two annular grooves on the arc-shaped outer expansion edges 1 at the left end and the right end, the upper part of the annular cross-section shape structure of the annular groove is rectangular, the lower part of the annular groove is inverted trapezoid, the polyether-ether-ketone ring 2 matched with the cross-section shape of the annular is embedded in the annular groove in an interference assembly mode, the polyether-ether-ketone ring 2 is arranged at the outer edge of the inner contact surface of the bearing bush base body 3, and the impact of alternating load generated by the reciprocating motion of a corresponding assembled plunger shaft driven by an eccentric connecting rod can be weakened.

Meanwhile, the four polyether-ether-ketone rings 2 on the left side and the right side have the same inner diameter, the inner diameter is 0.5-0.8 mm smaller than the inner diameter of the inner contact surface of the bearing bush base body 3, so that the outer edge of lubricating oil on the oil guide grid 5 on the inner side of the bearing bush base body 3 is sealed, and in the reciprocating motion process of a plunger shaft, the lubricating oil is filled in the inner contact surface area to form a lubricating oil film, so that on one hand, the cooling effect is realized, the inherent friction heat of the inner side of the bearing bush base body is reduced, on the other hand, the sliding lubrication effect is ensured, the friction is reduced, and the durability of the bearing bush is further ensured.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be appreciated by those skilled in the art that these examples are for illustrative purposes only and are not intended to limit the scope of the present utility model. Furthermore, it is to be understood that various changes, modifications and/or variations may be made by those skilled in the art after reading the technical content of the present utility model, and that all such equivalents are intended to fall within the scope of the present utility model as defined in the appended claims.

Claims

1. The bearing bush for the plunger pump is characterized by comprising a bearing bush base body, wherein the inner side of the bearing bush base body is provided with an inner contact surface, and the inner contact surface is of a hollow cylinder structure;

2. A bushing for a plunger pump according to claim 1, wherein the bushing substrate is made of babbitt or copper-based alloy.

3. A bearing shell for a plunger pump according to claim 1, wherein the bearing shell base body is formed with a wear-resistant structural coating on the inner surface corresponding to the inner contact surface.

4. The bushing for a plunger pump according to claim 1, wherein the inner contact surface is further formed with an oil guiding mesh, the oil guiding mesh is connected with the oil groove, is of a rhombic space circulation structure, and is formed in an inner contact surface area between annular grooves on two sides of the inner contact surface.

5. The bushing for a plunger pump according to claim 4, wherein the mesh groove depth on the oil guiding mesh is 1/3 to 1/2 of the groove depth.

6. A bearing bush for a plunger pump according to claim 1, wherein the annular groove has an inverted trapezoid bottom structure in a ring cross section, and the number of the annular groove and the polyether-ether-ketone ring arranged on the single-side arc-shaped outer expansion side is two.

7. A bearing shell for a plunger pump according to claim 1, wherein the annular groove has an inverted trapezoidal bottom structure in a ring cross section, and the polyetheretherketone ring is detachably fitted in the annular groove in an interference fit.