Plunger of plunger pump, plunger spring seat, plunger assembly and plunger assembly assembling method

Abstract

The present invention relates to a plunger of a plunger pump, a plunger spring seat, a plunger assembly and an assembly method of the plunger assembly. In the prior art, there are problems such as difficult assembly, low efficiency, easy detachment and cracking. The plunger assembly of the present invention includes a plunger and a plunger spring seat. A blind hole is provided at one end of the plunger body of the plunger. The plug of the plunger includes a guide body and an expansion body. The outer diameter of the guide body is less than or slightly less than the inner diameter of the blind hole of the plunger body. The outer diameter of the expansion body of the plunger is slightly greater than the inner diameter of the blind hole of the plunger body. The guide body of the plug is inserted into the blind hole of the plunger body, and then the expansion body is inserted into the blind hole, so that the blind hole end of the plunger body provided with the blind hole expands slightly; the spring guide body of the plunger spring seat has a plunger assembly hole, and the blind hole end of the plunger is inserted into the plunger assembly hole of the plunger spring seat. After the blind hole end of the plunger body expands, its outer diameter is slightly greater than the inner diameter of the plunger assembly hole. The processing technology of the present invention is simple and convenient, the fixation is very firm, and the stability of the product performance is improved.

Description

Technical Field

[0001] The present invention relates to a plunger pump, and more particularly to a plunger, a plunger spring seat, a plunger assembly and an assembly method thereof used in a plunger pump. In particular, the present invention relates to structural improvements of the plunger and the plunger spring seat to improve the assembly method between the plunger and the spring seat. Background Art

[0002] In the high-pressure cleaner industry, the plunger pump is one of the important power components of the cleaner. Among them, the plunger assembly is a very important component in the plunger pump. How to assemble the plunger onto the spring seat has been a technology that the industry has been seeking to improve. In the prior art, the plunger spring seat is usually a mesh body. When installing the plunger, there are problems such as difficult assembly and low efficiency. Especially after assembly, phenomena such as falling off and cracking are likely to occur, resulting in unstable product performance. Summary of the Invention

[0003] The object of the present invention is to improve the structures of the plunger, the plunger spring seat and the plunger assembly, improve the assembly method between the plunger and the spring seat, and improve the assembly efficiency and the stability of product performance in view of the deficiencies of the existing technology.

[0004] According to the above object, the present invention provides a plunger, which includes a plunger body. A blind hole is provided at one end of the plunger body. The plunger further includes a plug, which includes a guiding body and an expanding body. The outer diameter of the guiding body is less than or slightly less than the inner diameter of the blind hole of the plunger body. The outer diameter of the expanding body is slightly greater than the inner diameter of the blind hole of the plunger body. The plug is first inserted into the blind hole of the plunger body by the guiding body, and then the expanding body is inserted into the blind hole, so that the blind hole end of the plunger body provided with the blind hole is slightly expanded.

[0005] In the above plunger, the guiding body and the expanding body of the plug are connected by an inclined surface in a transitional manner.

[0006] In the above plunger, the transitional inclined surface is a plane.

[0007] In the above plunger, the transitional inclined surface is an arc surface.

[0008] In the above plunger, the plunger is formed by cold extrusion process in one step.

[0009] The present invention also provides a plunger spring seat, which includes a spring guiding body. The spring guiding body has a plunger assembly hole, and the plunger assembly hole is a blind hole for installing the plunger.

[0010] In the above plunger spring seat, the plunger spring seat has a working surface, and the working surface is a spherical surface.

[0011] In the above plunger spring seat, the plunger spring seat is integrally formed by a cold extrusion process.

[0012] The present invention also provides a plunger assembly, including a plunger and a plunger spring seat. The plunger is the same as the above-described plunger, and the plunger spring seat is the same as the above-described plunger spring seat. The blind hole end of the plunger is inserted into the plunger assembly hole of the plunger spring seat. After the blind hole end of the plunger body expands, its outer diameter is slightly larger than the inner diameter of the plunger assembly hole.

[0013] The present invention also provides an assembly method for a plunger assembly, including:

[0014] Insert the guiding body of a plug into the blind hole of the plunger body;

[0015] Align the plunger assembly hole of the plunger spring seat with the expanding body of the plug, apply pressure on the working surface of the plunger spring seat, and press the blind hole end of the plunger body into the plunger assembly hole of the plunger spring seat; and

[0016] Continue to apply pressure on the working surface of the plunger spring seat, so that the expanding body of the plug is inserted into the blind hole of the plunger body. The outer diameter of the expanding body is slightly larger than the inner diameter of the blind hole of the plunger body, so that the blind hole end of the plunger body expands outwards, and the plunger body is fixed in the plunger assembly hole of the plunger spring seat.

[0017] The present invention will be described in detail below through specific embodiments. Brief Description of the Drawings

[0018] Figure 1 Shows a schematic structural view of the plunger of the plunger pump of the present invention;

[0019] Figure 2 Shows a schematic structural view of the plunger spring seat of the present invention;

[0020] Figures 3A - 3C Shows a schematic view of the assembly process of the plunger and the spring seat.

[0021]

Symbol Description

[0022] Plunger body 1

[0023] Blind hole end 11

[0024] Blind hole 12

[0025] Plug 2

[0026] Guiding body 21

[0027] Expanding body 22

[0028] Transition surface 23

[0029] Plunger spring seat 3

[0030] Spring guide 31

[0031] Plunger assembly hole 32

[0032] Plunger working surface 33 Detailed implementation mode

[0033] As Figure 1 shown Figure 1 shows a schematic structural view of the plunger of the plunger pump of the present invention. It can be seen from the figure that the plunger includes a plunger body 1 and a plug 2.

[0034] The plunger body 1 is a cylinder, and a blind hole 12 is provided at one end of the cylinder. In the present invention, the end of the plunger 1 with the blind hole 12 is called the blind hole end 11. The depth of the blind hole 12 can be determined as needed. In this embodiment, the depth of the blind hole 12 is close to the length of the plunger body 1, and in another embodiment, the depth of the blind hole 12 can be less than half of the length of the plunger body 1.

[0035] Generally, the inner wall of the blind hole 12 is cylindrical. In special cases, the inner wall of the blind hole 12 can also be square cylindrical or other shapes. Preferably, the plunger 1 can be formed in one step by cold extrusion process.

[0036] The plug 2 includes a guide body 21 and an expansion body 22. The outer diameter of the guide body 21 is less than or slightly less than the inner diameter of the blind hole 12 of the plunger body 1, and the outer diameter of the expansion body 22 is slightly larger than the inner diameter of the blind hole 12 of the plunger body 1. The plug 2 is first inserted into the blind hole 12 of the plunger body 1 by the guide body 21, and then the expansion body 22 is forced into the blind hole 12. Since the outer diameter of the expansion body 22 is larger than the inner diameter of the blind hole 12, the expansion body 22 will squeeze the blind hole wall of the plunger body 1, so that the blind hole end 11 of the plunger body 1 expands slightly outward. The value of the outer diameter of the expansion body 22 can be determined according to actual needs, and the basic condition is slightly larger than the inner diameter of the blind hole 12.

[0037] Continue to refer to Figure 1 , there are various ways to transition between the guide body and the expansion body of the plug, such as stepped, inclined plane type, etc. In Figure 1 the embodiment, it shows that the transition surface 23 is an inclined plane, and this transition inclined plane is a plane. Of course, it can also be transitioned by an arc surface or other means.

[0038] Please refer to Figure 2 , Figure 2The structural schematic diagram of the plunger spring seat 3 of the present invention is shown. The plunger spring seat 3 includes a spring guide body 31, and the spring guide body 31 is further provided with a plunger assembly hole 32. The plunger assembly hole 32 is a blind hole for installing a plunger. One end of the spring guide body 31 relative to the blind hole is a plunger working surface 33, and this working surface can be a plane or a surface of other shapes, such as a spherical surface.

[0039] Similar to the processing method of the plunger 1, preferably, a cold extrusion process can be used for one-time forming.

[0040] Please refer to Figures 3A - 3C , which is a schematic diagram of the assembly process of the plunger and the spring seat. As Figure 3A shown, in the initial state, the plunger body 1, the plug 2, and the spring seat 3 are individual parts. First, insert the guide body 21 of the plug 2 into the blind hole 12 of the plunger body 1, and align the plunger assembly hole 32 of the plunger spring seat 3 with the expansion body 22 of the plug 2 to form the state as Figure 3B shown.

[0041] Then, apply pressure on the working surface 33 of the plunger spring seat 3 to press the blind hole end 11 of the plunger body 1 into the plunger assembly hole 32 of the plunger spring seat 3.

[0042] Finally, continue to apply pressure on the working surface 33 of the plunger spring seat 3 to make the expansion body 22 of the plug 2 plug into the blind hole 12 of the plunger body 1. Since the outer diameter of the expansion body 22 is slightly larger than the inner diameter of the blind hole 12 of the plunger body 1, the blind hole end 11 of the plunger body 1 expands outwards, and the plunger body 1 is fixed in the plunger assembly hole 32 of the plunger spring seat 3 due to the expansion (as Figure 3C shown).

[0043] In actual assembly operations, a tooling device can be used. For example, put the plunger body 1 with the guide body 21 of the plug 2 inserted into the corresponding tooling, and also put the spring seat 3 into the corresponding tooling, so that the plunger assembly hole 32 of the plunger spring seat 3 is aligned with the expansion body 22 of the plug 2. Then, the tooling applies pressure on the working surface 33 of the plunger spring seat 3 to press the blind hole end of the plunger body into the plunger assembly hole of the plunger spring seat.

[0044] As described above, in the present invention, the blind hole end 11 of the plunger body 1 is expanded to be fixed together with the plunger assembly hole 32 of the spring seat 3. This not only makes the processing technology simple and convenient, but also the fixation is very firm without falling off, greatly improving the stability of the product performance.

Claims

1. Assembly method of a plunger assembly, characterized in that, the plunger assembly includes a plunger and a plunger spring seat, the plunger includes a plunger body and a plug, the plug includes a guiding body and an expanding body, the outer diameter of the guiding body is smaller than the inner diameter of the blind hole of the plunger body, and the assembly method includes: inserting the guiding body of the plug into the blind hole of the plunger body; aligning the plunger assembly hole of the plunger spring seat with the expanding body of the plug, applying pressure on the working surface of the plunger spring seat, and pressing the blind hole end of the plunger body into the plunger assembly hole of the plunger spring seat; and continuing to apply pressure on the working surface of the plunger spring seat to make the expanding body of the plug fit into the blind hole of the plunger body, the outer diameter of the expanding body being slightly larger than the inner diameter of the blind hole of the plunger body, so that the blind hole end of the plunger body expands outwards and fixes the plunger body in the plunger assembly hole of the plunger spring seat.

2. The assembly method of the plunger assembly according to claim 1, characterized in that, the guiding body and the expanding body of the plug are connected by a bevel surface in a transitional manner.

3. The assembly method of the plunger assembly according to claim 2, characterized in that, the bevel surface is a flat surface.

4. The assembly method of the plunger assembly according to claim 2, characterized in that, the bevel surface is an arc surface.

5. The assembly method of the plunger assembly according to any one of claims 1-4, characterized in that, the plug and the plunger body are integrally formed by a cold extrusion process.

6. The assembly method of the plunger assembly according to claim 1, characterized in that, the working surface of the plunger spring seat is a spherical surface.

7. The assembly method of the plunger assembly according to claim 6, characterized in that, the plunger spring seat is integrally formed by a cold extrusion process.

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