Plunger pump supporting structure

Abstract

The utility model relates to the technical field of hydraulic plunger pumps, and discloses a plunger pump supporting structure which comprises a swash plate and a pump body, cylindrical tables are symmetrically arranged on the two sides of the swash plate, the swash plate is arranged in the pump body, two bearing holes used for installing the cylindrical tables are formed in the pump body, and needle bearings are arranged between the cylindrical tables and the bearing holes. According to the plunger pump supporting structure, the swash plate structure is simpler than a traditional swash plate structure, two semicircular arc structures are omitted and replaced by two simple cylindrical surfaces, and the machining difficulty and the manufacturing cost are greatly optimized; and meanwhile, the machining manufacturability of a pump body matched with the plunger pump is thoroughly improved, the tool cost is reduced, the research and development investment is reduced, the product development period is shortened, and the plunger pump plays a positive role in promoting the application of the plunger pump.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic piston pump technology, and specifically to a piston pump support structure. Background Technology

[0002] The swashplate is a crucial component in swashplate-type axial variable displacement piston pumps, playing a vital role in both open and closed piston pumps. Its main functions are twofold: firstly, to support the entire hydraulic cylinder and piston working mechanism; and secondly, to change the swashplate's angle within the pump by rotating around the common axis of its two semicircles, thereby altering the piston's stroke length within the hydraulic cylinder and ultimately varying the pump's output flow rate, thus achieving variable displacement.

[0003] Traditional plunger pumps have a swashplate structure, such as Figure 1 As shown, the pump body structure assembled with the swashplate is as follows: Figure 2 As shown, the overall structure of the plunger pump is as follows: Figure 3 As shown, in a piston pump, the piston and slipper are connected together by a spherical clamping connection. The pressure in the hydraulic cylinder acts on the piston end face, pressing the slipper against the surface of the swashplate 1. The surface of the swashplate 1 supports the slipper. When the swing angle of the swashplate 1 changes, the stroke of the slipper pushing the piston in the hydraulic cylinder changes, thus achieving variable displacement of the piston pump. The traditional swashplate 1 is designed with two semicircular arcs 2. Therefore, the pump body 3, which is installed with it, must also be designed and machined with two semicircular arcs 2 with the same basic diameter as the semicircular arcs of the swashplate 1. This allows the swashplate 1 to rotate and swing flexibly around the center of the arcs 2 when installed in the pump body 3, thus achieving variable displacement of the piston pump.

[0004] To ensure the flexibility of the swashplate's rotation around its arc axis, higher requirements are placed on the smoothness of the swashplate's left and right sides, as well as the roundness and coaxiality of the left and right arcs within the pump body. For the swashplate, the high requirements for roundness and coaxiality of the left and right arcs can be solved in a single machining operation. However, for the pump body, due to the limitations of its complex internal shape, machining an arc with the required roundness, coaxiality, and appropriate diameter within the pump body is technically challenging. Currently, the only solution in the industry is to use a double-arc power groove cutter head. This cutter needs to be custom-made, and the diameter of the arc machined by the custom-made cutter is fixed and cannot be adjusted. This means that the custom-made cutter can only machine a pump body with a swashplate diameter matching only, resulting in low utilization and high cost. Utility Model Content

[0005] The technical problem this invention aims to solve is that the existing plunger pump swashplate is designed with a two-half-circular arc structure, which results in poor machinability of the pump body, high cost of custom cutting tools, and long development cycle.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is to provide a plunger pump support structure, including a swashplate and a pump body. Cylindrical platforms are symmetrically arranged on both sides of the swashplate. The swashplate is located in the pump body. The pump body is provided with two bearing holes for mounting the cylindrical platforms. A needle roller bearing is provided between the cylindrical platforms and the bearing holes.

[0007] Optionally, one of the bearing holes is a blind hole located inside the pump body, and the other bearing hole is a second through hole penetrating the side wall of the pump body. A bearing seat is provided on the second through hole, and the needle roller bearing is disposed in the bearing seat.

[0008] Optionally, the bearing housing is connected to the pump body by screws, and an O-ring is provided between the bearing housing and the pump body.

[0009] Optionally, the swash plate has a recess in the middle, the bottom of the recess is a plane, and a first through hole is provided in the middle of the plane.

[0010] In summary, the plunger pump support structure provided by this utility model is simpler than the traditional swashplate structure, eliminating the two semi-circular arc structures and replacing them with two simple cylindrical surfaces, which greatly optimizes the processing difficulty and manufacturing cost. At the same time, it thoroughly improves the machinability of the pump body that is installed with it, reduces tooling costs, reduces R&D investment, and shortens the product development cycle, thus playing a positive role in promoting the application of plunger pumps. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a traditional swashplate structure.

[0012] Figure 2 A schematic diagram of the pump body structure for installation with a traditional swashplate.

[0013] Figure 3 A schematic diagram of the installation structure of a traditional swashplate in a piston pump;

[0014] Figure 4 This is a schematic diagram of the swashplate structure of this utility model;

[0015] Figure 5 A schematic diagram of the pump body structure to be installed in conjunction with this utility model;

[0016] Figure 6 This is a schematic diagram of the installation structure of this utility model in a plunger pump;

[0017] In the diagram: 1. Swashplate; 2. Semicircular arc; 3. Pump body; 4. Cylindrical platform; 5. Plane; 6. Bearing hole; 7. Needle roller bearing; 9. Bearing housing; 10. O-ring; 11. Screw. Detailed Implementation

[0018] The following combination Figure 1-6The present invention will be described in further detail below.

[0019] This utility model discloses a plunger pump support structure, referring to... Figures 4 to 6 The pump body includes a swashplate 1 and a pump body 3. Cylindrical platforms 4 are symmetrically arranged on both sides of the swashplate 1. The swashplate 1 is located inside the pump body 3. The pump body 3 has two bearing holes 6 for mounting the cylindrical platforms 4. A needle roller bearing 7 is provided between the cylindrical platform 4 and the bearing hole 6. One of the bearing holes 6 is a blind hole located inside the pump body 3, and the other bearing hole 6 is a second through hole penetrating the side wall of the pump body 3. A bearing seat 9 is provided on the second through hole. The needle roller bearing 7 is located in the bearing seat 9. The bearing seat 9 is connected to the pump body 3 by screws 11. An O-ring 10 is provided between the bearing seat 9 and the pump body 3 for sealing the hydraulic oil inside the pump body 3. The center of the two needle roller bearings 7 inside the pump body 3 serves as the axis for the variable rotation of the swashplate 1.

[0020] In a further embodiment, the swash plate 1 has a recess in the middle, the bottom of the recess is a plane 5, the plane 5 has a first through hole in the middle, the plane 5 is consistent with the plane 5 on the conventional swash plate 1, and is used to support the axial force on the piston slipper in the piston pump when it moves in the variable cylinder.

[0021] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A plunger pump support structure, characterized by, The invention relates to a swash plate (1) and a pump body (3), the swash plate (1) is symmetrically provided with a cylindrical platform (4) on both sides, the swash plate (1) is arranged in the pump body (3), the pump body (3) is provided with two bearing holes (6) for mounting the cylindrical platform (4), and a needle bearing (7) is arranged between the cylindrical platform (4) and the bearing hole (6).

2. The plunger pump support structure of claim 1, wherein, One of the bearing holes (6) is a blind hole in the pump body (3), and the other bearing hole (6) is a second through hole penetrating the side wall of the pump body (3), the second through hole is provided with a bearing seat (9), and the needle bearing (7) is arranged in the bearing seat (9).

3. The plunger pump support structure of claim 2, wherein, The bearing seat (9) is connected with the pump body (3) through a screw (11), and an O-ring (10) is arranged between the bearing seat (9) and the pump body (3).

4. The plunger pump support structure of claim 1, wherein, A recess is arranged in the middle of the swash plate (1), the bottom of the recess is a flat surface (5), and a first through hole is arranged in the middle of the flat surface (5).

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