Plunger pump with simple structure

Abstract

The utility model discloses a plunger pump with a simple structure, which comprises a cylinder body, a return plate and a spring seat, a step is arranged on the cylinder body, a ball socket is arranged on the return plate, a ball matched with the ball socket is fixed at one end of the spring seat, and the other end of the spring seat is positioned in the step of the cylinder body. A disc spring is arranged at the step of the cylinder body, and the two sides of the disc spring are connected with the spring seat and the cylinder body respectively. Compared with the prior art, the ball body is a part of the spring seat, so that the mounting step of a steel ball is omitted. And secondly, the disc spring is adopted to replace a previous cylindrical spring, so that a large amount of mounting space is saved, slotting on the transmission shaft is avoided, the processing cost is reduced, and the structural strength of the transmission shaft is ensured. The overall structure is simple, and assembling is easy.

Description

Technical Field

[0001] This utility model relates to the field of plunger pump manufacturing technology, and in particular to a plunger pump with a simple structure. Background Technology

[0002] A piston pump is an important energy conversion element in a high-pressure hydraulic system. It relies on the reciprocating motion of the piston in the piston slipper assembly within the cylinder to change the volume of hydraulic oil in the sealed cavity, thereby realizing the intake and exhaust of hydraulic oil in the hydraulic circuit and converting the mechanical energy provided by the electric motor into hydraulic energy.

[0003] The key center spring has two main functions: 1. To apply force to the return plate, pressing it firmly against the swashplate to complete the piston pump's oil suction and discharge. 2. To apply force to the cylinder block, ensuring it is in close contact with the distributor plate before the piston pump builds up pressure, thus guaranteeing a certain contact pressure and fulfilling the oil suction and discharge functions.

[0004] In the existing plan, refer to the appendix Figure 1 The center spring acts on the inner sleeve at one end, transmitting force to the cylinder block through the inner sleeve; at the other end, it acts on the spring seat, transmitting force to the return plate through the steel ball. The center spring has two main functions: 1. To apply force to the return plate, ensuring it presses tightly against the slipper and fits snugly against the swashplate, thus completing the piston pump's oil suction and discharge functions. 2. To apply force to the cylinder block, ensuring it fits snugly against the distributor plate before the piston pump builds up pressure, maintaining a certain contact pressure to satisfy the oil suction and discharge functions.

[0005] The existing structure has the following disadvantages:

[0006] 1. To allow space for the center spring, a hole needs to be drilled inside the drive shaft to avoid it. This hole reduces the drive shaft's load-bearing capacity and increases the cost of machining the parts. Furthermore, the increased number of parts required to function as the center spring further increases manufacturing costs.

[0007] 2. The steel ball is prone to falling out of the spring seat during assembly, which will cause the central spring to not work effectively after assembly, and the pump will not work properly. Therefore, the assembly is difficult and the later maintenance is troublesome. Utility Model Content

[0008] (a) Technical problems to be solved

[0009] Based on this, this utility model proposes a simple plunger pump, which aims to solve the problems that the existing central spring reduces the structural strength of the drive shaft and is difficult to assemble and has a high cost.

[0010] (II) Technical Solution

[0011] To overcome or at least partially solve the above problems, this utility model provides a simple plunger pump, including a cylinder and a return plate. The cylinder has a step, and the return plate has a ball socket. It also includes a spring seat. One end of the spring seat is fixed with a ball that mates with the ball socket, and the other end of the spring seat is located inside the step of the cylinder. A disc spring is provided at the step of the cylinder, and both sides of the disc spring are connected to the spring seat and the cylinder respectively.

[0012] Preferably, the spring seat is provided with a positioning post, and the disc spring is sleeved on the positioning post.

[0013] Preferably, the end of the sphere near the disc spring has a mounting surface, and the fixing post of the spring seat is fixed on the mounting surface.

[0014] Preferably, a first frustum is fixed to one end of the fixing post near the disc spring.

[0015] Preferably, a second frustum is fixed to one end of the first frustum near the disc spring, and the diameter of the second frustum is larger than the diameter of the first frustum.

[0016] Preferably, the mounting surface is circular, and the diameter of the fixing post is smaller than the diameter of the mounting surface.

[0017] Preferably, the end of the sphere furthest from the mounting surface has a first plane.

[0018] Preferably, a gap is provided between the drive shaft and the positioning pin inside the cylinder.

[0019] Preferably, the cylinder body is provided with a plunger slipper assembly, and the return plate is used to press the slipper of the plunger slipper assembly onto the swashplate.

[0020] Preferably, the cylinder block is provided with an oil distribution plate at the end away from the return plate.

[0021] (III) Beneficial Effects

[0022] The simple plunger pump of this invention has the following advantages:

[0023] In this invention, the sphere is part of the spring seat, eliminating the need for installing the steel ball separately. Secondly, using a disc spring instead of the previous cylindrical spring saves a significant amount of installation space, avoids slotting on the drive shaft, reduces processing costs, and helps ensure the structural strength of the drive shaft. Thirdly, the overall structure is simple and easy to assemble. Attached Figure Description

[0024] The features and advantages of this utility model will be more clearly understood by referring to the accompanying drawings. The drawings are schematic and should not be construed as limiting the utility model in any way. In the drawings:

[0025] Figure 1 This is a schematic diagram of the existing technology;

[0026] Figure 2 This is a schematic diagram of the structure of this utility model;

[0027] Figure 3 This is a schematic diagram of the spring seat of this utility model;

[0028] Figure 4 This is a front view of the spring seat of this utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Cylinder block, 11. Step, 2. Return plate, 21. Ball socket, 3. Spring seat, 31. Ball, 32. Locating pin, 33. Fixing pin, 34. First frustum, 35. Second frustum, 4. Disc spring, 5. Drive shaft, 6. Piston slipper assembly, 7. Swashplate, 8. Oil distribution plate, 100. Mounting surface, 200. First plane. Detailed Implementation

[0031] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0032] See attached document Figure 2 This embodiment provides a simple plunger pump, including a cylinder body 1 and a return plate 2. The cylinder body 1 has a step 11, and the return plate 2 has a ball socket 21. The plunger pump also includes a spring seat 3. One end of the spring seat 3 is fixed with a ball 31 that mates with the ball socket 21, and the other end of the spring seat 3 is located within the step 11 of the cylinder body 1. A disc spring 4 is provided at the step 11 of the cylinder body 1, and both sides of the disc spring 4 are connected to the spring seat 3 and the cylinder body 1, respectively. In this invention, fixing the ball 31 to the spring seat 3 facilitates assembly within the pump body. Furthermore, using a disc spring instead of a cylindrical helical spring solves the space constraints problem, eliminating the need for slotting on the drive shaft 5 and reducing processing costs. This invention only requires the spring seat 3 and the disc spring 4 to achieve the original function, resulting in a simple overall structure and reduced manufacturing costs.

[0033] As another embodiment of this utility model: refer to the appendix Figure 4 The spring seat 3 is provided with a positioning post 32, and the disc spring 4 is installed by fitting it onto the positioning post 32.

[0034] As another embodiment of this utility model: refer to the appendix Figure 3 The end of the ball 31 near the disc spring 4 has a mounting surface 100, and the fixing post 33 of the spring seat 3 is fixed on the mounting surface 100. The mounting surface 100 can effectively increase the connection area between the ball 31 and the spring seat 3, so that the ball 31 can be more firmly fixed on the spring seat 3.

[0035] As another embodiment of the present invention: a first frustum 34 is fixed to one end of the fixed post 33 near the disc spring 4, the smaller end of the first frustum 34 is close to the fixed post 33, and the diameter of the smaller end of the first frustum 34 is the same as the diameter of the fixed post 33.

[0036] In another embodiment of this utility model: a second frustum 35 is fixed to one end of the first frustum 34 near the disc spring 4, and the diameter of the second frustum 35 is larger than the diameter of the first frustum 34. The two frustums provide support for the fixed column 33 while reducing the space occupied by the spring seat 3 and avoiding obstruction of the return plate 2.

[0037] In another embodiment of this utility model, the mounting surface 100 is circular, and the diameter of the fixing post 33 is smaller than the diameter of the mounting surface 100.

[0038] As another embodiment of this utility model: the end of the sphere 31 away from the mounting surface 100 is provided with a first plane 200, which can reduce the contact area with the ball socket 21.

[0039] As another embodiment of this utility model: a gap is provided between the drive shaft 5 and the positioning column 32 inside the cylinder 1.

[0040] As another embodiment of the present invention: the cylinder body 1 is provided with a plunger slipper assembly 6, and the return plate 2 is used to press the slipper of the plunger slipper assembly 6 onto the swashplate 7.

[0041] As another embodiment of this utility model: an oil distribution plate 8 is provided at the end of the cylinder body 1 away from the return plate 2.

[0042] Finally, the method of this utility model is only a preferred embodiment and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

[0043] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A simple piston pump, comprising a cylinder body and a return plate, wherein the cylinder body has a step and the return plate has a ball socket, characterized in that, It also includes a spring seat, one end of which is fixed with a ball that mates with a ball socket, and the other end of which is located inside the step of the cylinder body. A disc spring is provided at the step of the cylinder body, and the two sides of the disc spring are connected to the spring seat and the cylinder body respectively.

2. The simple plunger pump according to claim 1, characterized in that, The spring seat is provided with a positioning post, and the disc spring is sleeved on the positioning post.

3. The simple plunger pump according to claim 2, characterized in that, The sphere has a mounting surface at one end near the disc spring, and the fixing post of the spring seat is fixed on the mounting surface.

4. The simple plunger pump according to claim 3, characterized in that, The first frustum is fixed to one end of the fixed post near the disc spring.

5. The simple plunger pump according to claim 4, characterized in that, A second frustum is fixed to one end of the first frustum near the disc spring, and the diameter of the second frustum is larger than the diameter of the first frustum.

6. The simple plunger pump according to claim 5, characterized in that, The mounting surface is circular, and the diameter of the fixing post is smaller than the diameter of the mounting surface.

7. The simple plunger pump according to claim 6, characterized in that, The end of the sphere furthest from the mounting surface has a first plane.

8. The simple plunger pump according to claim 7, characterized in that, There is a gap between the drive shaft and the positioning column inside the cylinder.

9. The simple plunger pump according to claim 8, characterized in that, The cylinder body is provided with a plunger slipper assembly, and the return plate is used to press the slipper of the plunger slipper assembly onto the swashplate.

10. The simple plunger pump according to claim 9, characterized in that, An oil distribution plate is provided at the end of the cylinder block away from the return plate.

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