CN114458589A - Plunger pump plunger, plunger spring seat, plunger assembly and assembly method of plunger assembly - Google Patents

Abstract

The invention relates to a plunger of a plunger pump, a plunger spring seat, a plunger assembly and a method for assembling the plunger assembly. In the prior art, there are phenomena such as difficult assembly, low efficiency, easy to fall off, and cracking. The plunger assembly of the present invention includes a plunger and a plunger spring seat, a blind hole is opened at one end of the plunger body of the plunger, the plunger includes a guide body and an expansion body, and the outer diameter of the guide body is smaller than or slightly smaller than that of the plunger. The inner diameter of the blind hole of the plug body, the outer diameter of the expansion body of the plunger is slightly larger 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 is slightly expanded; 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, and the plunger body The outer diameter of the blind hole end is slightly larger than the inner diameter of the plunger assembly hole after expansion. The processing technology of the invention is simple and convenient, the fixing is very firm, and the stability of product performance is improved.

Description

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

technical field

The invention relates to a plunger pump, in particular to a plunger, a plunger spring seat, a plunger assembly and a method for assembling the plunger assembly used in the plunger pump, in particular to the structural improvement of the plunger and the plunger spring seat , to improve the assembly method between the plunger and the spring seat.

Background technique

In the high-pressure cleaning machine industry, the plunger pump is one of the important power components of the cleaning machine. The plunger assembly is a very important component in the plunger pump. How the plunger is assembled to the spring seat is one of the technologies that the industry has been seeking to improve. one. In the prior art, the plunger spring seat is usually a mesh body. When the plunger is installed, there are problems of difficulty in assembly and low efficiency. Especially after the assembly is completed, it is easy to fall off, crack and other phenomena, resulting in unstable product performance.

SUMMARY OF THE INVENTION

The purpose of the present invention is to improve the structure 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 product performance. stability.

According to the above purpose, the present invention provides a plunger, comprising a plunger body, a blind hole is opened at one end of the plunger body, the plunger further comprises a plug, and the plug includes a guide body and an expansion body, so The outer diameter of the guide body is smaller or slightly smaller than the inner diameter of the blind hole of the plunger body, and the outer diameter of the expansion body is slightly larger than the inner diameter of the blind hole of the plunger body. The guide body 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 is slightly expanded.

In the above-mentioned plunger, the guide body of the plug and the expansion body are connected by an inclined plane transition.

In the above-mentioned plunger, the transition slope is a plane.

In the above-mentioned plunger, the transition slope is an arc surface.

In the above-mentioned plunger, the plunger is formed at one time by a cold extrusion process.

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

In the above-mentioned plunger spring seat, the plunger spring seat has a working surface, and the working surface is a spherical surface.

In the above plunger spring seat, the plunger spring seat is formed at one time by a cold extrusion process.

The present invention also provides a plunger assembly, comprising a plunger and a plunger spring seat, the plunger adopts the above-mentioned plunger, the plunger spring seat adopts the above-mentioned plunger, and the blind hole of the plunger adopts the above-mentioned plunger. The end is inserted into the plunger assembly hole of the plunger spring seat, and the outer diameter of the blind hole end of the plunger body is slightly larger than the inner diameter of the plunger assembly hole after expansion.

The present invention also provides a method for assembling the plunger assembly, comprising:

Insert the guide body of a plug into the blind hole of the plunger body;

Align the plunger assembly hole of the plunger spring seat with the expansion 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 in the plunger assembly hole of the spring seat; and

Continue to apply pressure on the working surface of the plunger spring seat, so that the expansion body of the plug is inserted into the blind hole of the plunger body, and the outer diameter of the expansion body is slightly larger than the diameter of the plunger body. The inner diameter of the blind hole causes the blind hole end of the plunger body to expand outward to fix the plunger body in the plunger assembly hole of the plunger spring seat.

The present invention will be described in detail below through specific embodiments.

Description of drawings

Fig. 1 shows the structural schematic diagram of the plunger pump plunger of the present invention;

Fig. 2 shows the structural schematic diagram of the plunger spring seat of the present invention;

3A-3C show schematic diagrams of the assembly process of the plunger and the spring seat.

【Symbol Description】

Plunger body 1

Blind hole end 11

Blind hole 12

stopper 2

Guide body 21

Expansion body 22

transition surface 23

Plunger spring seat 3

Spring guide 31

Plunger assembly hole 32

Plunger working face 33

Detailed ways

As shown in FIG. 1 , FIG. 1 shows a schematic structural diagram of the plunger of the plunger pump of the present invention. As can be seen from the figure, the plunger includes a plunger body 1 and a plug 2 .

The plunger body 1 is a cylinder, and a blind hole 12 is opened 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 required. In this embodiment, the depth of the blind hole 12 is close to the length of the plunger body 1 , while in other embodiments, the depth of the blind hole 12 may be less than half of the length of the plunger body 1 .

Usually, the inner wall of the blind hole 12 is cylindrical, and in special cases, the inner wall of the blind hole 12 may also be in other shapes such as a square cylinder. Preferably, the plunger 1 can be formed at one time by a cold extrusion process.

The plug 2 includes a guide body 21 and an expansion body 22 . The outer diameter of the guide body 21 is smaller or slightly smaller 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 through the guide body 21 , and then the expansion body 22 is pushed into the blind hole 12 by force. 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 wall of the blind hole of the plunger body 1 , so that the blind hole end 11 of the plunger body 1 is slightly expanded outward. The value of the outer diameter of the expansion body 22 can be determined according to actual needs, and the basic condition is that it is slightly larger than the inner diameter of the blind hole 12 .

Continuing to refer to FIG. 1 , the transition between the guide body and the expansion body of the plug can be in various ways, such as a stepped type, a slope type, and the like. In the embodiment of FIG. 1 , the transition surface 23 is shown as an inclined surface, which is a flat surface. Of course, the transition can also be performed by means of an arc surface or the like.

Please refer to FIG. 2, which shows a schematic structural diagram of the plunger spring seat 3 of the present invention. 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, and the plunger assembly hole 32 is a blind hole for installing the plunger. One end of the spring guide body 31 opposite to the blind hole is a plunger working surface 33 , and the working surface can be a plane or a surface of other shapes, such as a spherical surface.

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

Please refer to FIGS. 3A-3C , which are schematic diagrams of the assembly process of the plunger and the spring seat. As shown in FIG. 3A , in the initial state, the plunger body 1 , the plug 2 and the spring seat 3 are a single part. First, insert the guide body 21 of the stopper 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 stopper 2 to form the state shown in FIG. 3B .

Then, press 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 .

Finally, continue to apply pressure on the working surface 33 of the plunger spring seat 3, so that the expansion body 22 of the plug 2 is inserted into the blind hole 12 of the plunger body 1. Since the outer diameter of the expansion body 22 is slightly larger than that of the plunger body 1 The inner diameter of the blind hole 12 is adjusted so that the blind hole end 11 of the plunger body 1 expands outward, and the plunger body 1 is fixed in the plunger assembly hole 32 of the plunger spring seat 3 due to the expansion (as shown in FIG. 3C ).

In the actual assembly operation, tooling equipment can be used, for example, the plunger body 1 that has been inserted into the guide body 21 of the plug 2 is put into the corresponding tooling, and the spring seat 3 is also put into the corresponding tooling, so that The plunger fitting hole 32 of the plunger spring seat 3 is aligned with the expansion body 22 of the plug 2 . Then, the tool is pressed on the working surface 33 of the plunger spring seat 3, and the blind hole end of the plunger body is pressed into the plunger assembly hole of the plunger spring seat.

As mentioned above, in the present invention, the blind hole end 11 of the plunger body 1 is expanded to be fixed with the plunger assembly hole 32 of the spring seat 3, which is not only simple and convenient in the processing process, but also very firmly fixed and will not fall off. phenomenon, greatly improving the stability of product performance.

Claims (11)

1. A plunger, comprising a plunger body, characterized in that a blind hole is provided at one end of the plunger body, the plunger further comprises a plug, and the plug comprises a guide body and an expansion body, the The outer diameter of the guide body is smaller or slightly smaller than the inner diameter of the blind hole of the plunger body, the outer diameter of the expansion body is slightly larger than the inner diameter of the blind hole of the plunger body, and the plug is first The guide body 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 is slightly expanded. 2 . The plunger according to claim 1 , wherein the guide body of the plug and the expansion body are transitionally connected by an inclined plane. 3 . 3. The plunger of claim 2, wherein the transition slope is a flat surface. 4. The plunger of claim 2, wherein the transition slope is an arc surface. 5 . The plunger according to claim 1 , wherein the plunger is formed by a cold extrusion process at one time. 6 . 6. A plunger spring seat, comprising a spring guide body, wherein the spring guide body has a plunger assembly hole, and the plunger assembly hole is a blind hole for installing the plunger. 7 . The plunger spring seat of claim 6 , wherein the plunger spring seat has a working surface, and the working surface is a spherical surface. 8 . 8 . The plunger spring seat of claim 6 , wherein the plunger spring seat is formed at one time by a cold extrusion process. 9 . 9. A plunger assembly, comprising a plunger and a plunger spring seat, wherein the plunger adopts the plunger claimed in one of the above claims 1-5, and the plunger spring seat adopts the above claim The plunger claimed in one of 6-8, the blind hole end of the plunger is inserted into the plunger assembly hole of the plunger spring seat, and the outer diameter of the blind hole end of the plunger body is slightly larger than that after expansion The inner diameter of the plunger assembly hole. 10. The assembly method of the plunger assembly is characterized in that, comprising: Insert the guide body of a plug into the blind hole of the plunger body; Align the plunger assembly hole of the plunger spring seat with the expansion 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 in the plunger assembly hole of the spring seat; and Continue to apply pressure on the working surface of the plunger spring seat, so that the expansion body of the plug is inserted into the blind hole of the plunger body, and the outer diameter of the expansion body is slightly larger than the diameter of the plunger body. The inner diameter of the blind hole causes the blind hole end of the plunger body to expand outward to fix the plunger body in the plunger assembly hole of the plunger spring seat. 11. The assembly method of the plunger assembly according to claim 10, wherein the plunger adopts the plunger claimed in one of the above claims 1-5, and the plunger spring seat adopts the above claim 6 -One of the 8 claimed plungers.

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