CN110671316A - High-abrasion-resistance high-sealing piston - Google Patents

Abstract

The invention discloses a high wear-resistant and high-sealing piston, comprising an elastic piston, a piston rod hole is formed in the center of the elastic piston along its axial direction, and a concave array is arranged on the circumferential surface of the elastic piston in contact with a cylinder liner The pit array is composed of regularly arranged oval pits; the short axis direction of the oval pit is parallel to the axial direction of the elastic piston; the ratio of the short axis to the long axis of the oval pit is 0.5～ 0.75; the depth of the oval pit is 0.3 to 0.4 times the short axis of the oval pit. The invention overcomes the deficiencies of the existing pistons with poor wear resistance and poor sealing performance, processes elliptical pits on the surface of the elastic piston, utilizes the interference fit between the piston and the cylinder liner, the piston is squeezed during installation, and the oval pits are deformed to form The circular pit increases the storage capacity of lubricating oil, improves the wear resistance and sealing performance of the piston, and prolongs the service life of the piston.

Description

A highly wear-resistant and high-sealing piston

technical field

The invention relates to the technical field of pistons, in particular to a high wear-resistant and high-sealing piston.

Background technique

Piston is one of the core components in linear reciprocating pumps, such as mud pumps in the oil industry and drilling pumps in the construction field. During the power stroke of the piston, the pressure is large, the wear between the piston surface and the cylinder liner is increased, and the lubrication effect between the piston and the cylinder liner is poor, which also aggravates the wear of the piston.

The piston and the cylinder liner are installed by interference fit, and the sealing effect is poor. At the same time, the storage capacity of the piston lubricating oil is poor, and a stable lubricating oil film cannot be established between the piston and the cylinder liner, resulting in poor lubrication performance, resulting in increased piston wear, poor piston sealing effect, and shortened piston service life. The demand for non-metallic pistons increases year by year, especially in the petroleum industry, but the piston's wear resistance and sealing properties continue to limit the working life of the piston.

Therefore, how to provide a highly wear-resistant and high-sealing piston is an urgent problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a high wear-resistant and high-sealing piston, which aims to overcome the shortcomings of the existing pistons with poor wear resistance and poor sealing performance. With a good fit, the piston is squeezed during installation, and the oval pit is deformed to form a circular pit, which increases the storage capacity of lubricating oil, improves the wear resistance and sealing performance of the piston, and prolongs the service life of the piston.

In order to achieve the above object, the present invention adopts the following technical solutions:

A highly wear-resistant and high-sealing piston, comprising an elastic piston, the center of the elastic piston is provided with a piston rod hole along its axial direction, and an array of pits is arranged on the circumferential surface of the elastic piston in contact with the cylinder liner; The pit array is composed of regularly arranged oval pits; the short axis direction of the oval pits is parallel to the axial direction of the elastic piston; the ratio of the short axis to the long axis of the oval pits is 0.5-0.75; the The depth of the oval pit is 0.3-0.4 times the long axis of the oval pit.

Preferably, in the above-mentioned piston with high wear resistance and high sealing, the area of the dimple array accounts for 15-30% of the circumferential area of the elastic piston.

Preferably, in the above-mentioned piston with high wear resistance and high sealing, the distribution spacing in the direction of the long axis of the elliptical pits is 1.9 to 4 times that of the long axis of the oval pits.

Preferably, in the above-mentioned highly wear-resistant and high-sealing piston, the distance between the elliptical dimple array and the bottom end of the elastic piston is H, and H is 3 to 8 times the short axis of the elliptical dimple.

Preferably, in the above-mentioned piston with high wear resistance and high sealing, the elliptical recesses are uniformly distributed in the circumferential direction of the surface of the elastic piston.

Preferably, in the above-mentioned high wear-resistant and high-sealing piston, the elliptical recesses are distributed in a rhombus shape in the circumferential direction of the surface of the elastic piston.

Preferably, in the above-mentioned highly wear-resistant and high-sealing piston, the elliptical dimples in the dimple array are distributed at equal intervals along the short axis direction thereof.

Preferably, in the above-mentioned highly wear-resistant and high-sealing piston, the lengths of the long axis and the short axis of the elliptical dimples in the dimple array vary equally along the direction of the short axis.

Preferably, in the above-mentioned high wear-resistant and high-sealing piston, the array of dimples provided on the circumferential surface of the elastic piston is processed by one or more combinations of mold, numerical control, and laser processing.

Preferably, in the above-mentioned high wear-resistant and high-sealing piston, the elastic piston is made of rubber, nylon or polyurethane.

As can be seen from the above technical solutions, compared with the prior art, the present invention provides a highly wear-resistant and high-sealing piston. The surface of the elastic piston is machined with elliptical pits, and the interference fit between the piston and the cylinder liner is used. The piston is squeezed and deformed during installation, and the oval pit on the surface is transformed into a circular pit, which increases the storage capacity of lubricating oil and reduces the piston. At the same time, it helps to lubricate and establish oil film pressure, which helps to improve the wear resistance and sealing performance of the piston, and finally improves the service life of the piston, prolongs the replacement cycle, and improves the economic performance.

The invention relates to a high wear-resistant and high-sealing piston, which can be widely used in pistons made of non-metallic elastic materials.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative efforts.

Fig. 1 is the three-dimensional schematic diagram of the present invention;

Fig. 2 is the schematic diagram of the uniform distribution structure of the elliptical pit on the surface of the elastic piston in the embodiment 1;

Fig. 3 is the schematic diagram that the elliptical pit on the surface of the elastic piston adopts the rhombus distribution structure in the embodiment 2;

4 is a schematic diagram of the equidistant spacing distribution structure along the short axis direction of the elliptical pits on the surface of the elastic piston in Example 3;

FIG. 5 is a schematic diagram of the distribution structure of the elliptical dimples with variable diameters on the surface of the elastic piston along the short axis direction of the equidistant spacing in Example 4. FIG.

Among them, 1- top of piston, 2- bottom of piston, 3- elastic piston, 4- piston rod hole, 5- array of pits, a- short and long diameter of oval pit, b- long radius of oval pit, L- The elliptical pits are distributed with spacing in the short axis direction, t is the difference in the distribution spacing of adjacent elliptical pits in the short axis direction, and H is the distance between the pit array and the bottom end of the elastic piston.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The embodiment of the invention discloses a high wear-resistant and high-sealing piston, which overcomes the shortcomings of the existing piston with poor wear resistance and poor sealing performance. When the piston is squeezed, the oval pit is deformed to form a circular pit, which increases the storage capacity of lubricating oil, improves the wear resistance and sealing performance of the piston, and prolongs the service life of the piston.

Example 1

The elliptical pits on the surface of the elastic piston 3 adopt a uniform distribution structure.

A highly wear-resistant and high-sealing piston, comprising an elastic piston 3, the center of the elastic piston 3 is provided with a piston rod hole 4 along its axial direction, and an array of pits 5 is arranged on the circumferential surface of the elastic piston 3 in contact with the cylinder liner; The array 5 is composed of regularly arranged oval pits; the short axis direction of the oval pits is parallel to the axial direction of the elastic piston 3; the ratio of the short axis to the long axis of the oval pits is 0.6; 0.3 times the long axis of the pit.

In order to further optimize the above technical solution, the area of the dimple array 5 accounts for 20% of the circumferential area of the elastic piston 3 .

In order to further optimize the above technical solution, the distribution pitch in the direction of the long axis of the elliptical pits is three times that of the long axis of the elliptical pits.

In order to further optimize the above technical solution, the distance between the elliptical dimple array 5 and the bottom end of the elastic piston 3 is H, and H is 4 times the short axis of the elliptical dimple.

In order to further optimize the above technical solution, the elliptical dimples are evenly distributed in the circumferential direction of the surface of the elastic piston 3 .

In order to further optimize the above technical solution, the array of dimples 5 provided on the circumferential surface of the elastic piston 3 is manufactured by one or more combinations of mold, numerical control, and laser processing.

In order to further optimize the above technical solution, the elastic piston 3 is made of rubber, nylon or polyurethane.

Embodiment 2

The elliptical pits on the surface of the elastic piston 3 adopt a rhombus distribution structure.

A highly wear-resistant and high-sealing piston, comprising an elastic piston 3, the center of the elastic piston 3 is provided with a piston rod hole 4 along its axial direction, and an array of pits 5 is arranged on the circumferential surface of the elastic piston 3 in contact with the cylinder liner; The array 5 is composed of regularly arranged oval pits; the short axis direction of the oval pits is parallel to the axial direction of the elastic piston 3; the ratio of the short axis to the long axis of the oval pits is 0.6; 0.4 times the long axis of the pit.

In order to further optimize the above technical solution, the area of the dimple array 5 accounts for 20% of the circumferential area of the elastic piston 3 .

In order to further optimize the above technical solution, the distribution pitch in the direction of the long axis of the elliptical pits is twice the long axis of the elliptical pits.

In order to further optimize the above technical solution, the distance between the elliptical dimple array 5 and the bottom end of the elastic piston 3 is H, and H is 5 times the short axis of the elliptical dimple.

In order to further optimize the above technical solution, the elliptical dimples are distributed in a diamond shape in the circumferential direction of the surface of the elastic piston 3 .

In order to further optimize the above technical solution, the array of dimples 5 provided on the circumferential surface of the elastic piston 3 is manufactured by one or more combinations of mold, numerical control, and laser processing.

In order to further optimize the above technical solution, the elastic piston 3 is made of rubber, nylon or polyurethane.

Embodiment 3

The elliptical dimples on the surface of the elastic piston 3 are equally spaced along the short axis direction.

A highly wear-resistant and high-sealing piston, comprising an elastic piston 3, the center of the elastic piston 3 is provided with a piston rod hole 4 along its axial direction, and an array of pits 5 is arranged on the circumferential surface of the elastic piston 3 in contact with the cylinder liner; The array 5 is composed of regularly arranged oval pits; the short axis direction of the oval pits is parallel to the axial direction of the elastic piston 3; the ratio of the short axis to the long axis of the oval pits is 0.5; 0.3 times the long axis of the pit.

In order to further optimize the above technical solution, the area of the dimple array 5 accounts for 15% of the circumferential area of the elastic piston 3 .

In order to further optimize the above technical solution, the distribution pitch in the direction of the long axis of the elliptical pits is 1.9 times that of the long axis of the elliptical pits.

In order to further optimize the above technical solution, the distance between the elliptical dimple array 5 and the bottom end of the elastic piston 3 is H, and H is 3 times the short axis of the elliptical dimple.

In order to further optimize the above technical solution, the elliptical pits in the pit array 5 are distributed at equal intervals along the short axis direction, the interval is L, and the difference is t.

In order to further optimize the above technical solution, the array of dimples 5 provided on the circumferential surface of the elastic piston 3 is manufactured by one or more combinations of mold, numerical control, and laser processing.

In order to further optimize the above technical solution, the elastic piston 3 is made of rubber, nylon or polyurethane.

Embodiment 4

The variable-diameter elliptical pits on the surface of the elastic piston 3 are equally spaced along the short-axis direction.

A highly wear-resistant and high-sealing piston, comprising an elastic piston 3, the center of the elastic piston 3 is provided with a piston rod hole 4 along its axial direction, and an array of pits 5 is arranged on the circumferential surface of the elastic piston 3 in contact with the cylinder liner; The array 5 is composed of regularly arranged oval pits; the short axis direction of the oval pits is parallel to the axial direction of the elastic piston 3; the ratio of the short axis to the long axis of the oval pits is 0.75; the depth of the oval pits is oval pits. 0.4 times the long axis of the pit.

In order to further optimize the above technical solution, the area of the dimple array 5 accounts for 30% of the circumferential area of the elastic piston 3 .

In order to further optimize the above technical solution, the elliptical pits in the pit array 5 are distributed at equal intervals along the short axis direction thereof.

In order to further optimize the above technical solution, the lengths of the long axis and the short axis of the elliptical pits in the pit array 5 vary equally along the direction of the short axis.

In order to further optimize the above technical solution, the array of dimples 5 provided on the circumferential surface of the elastic piston 3 is manufactured by one or more combinations of mold, numerical control, and laser processing.

In order to further optimize the above technical solution, the elastic piston 3 is made of rubber, nylon or polyurethane.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the description of the method.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A highly wear-resistant and high-sealing piston, characterized in that it comprises an elastic piston, the center of the elastic piston is provided with a piston rod hole along its axial direction, and a concave surface is provided on the circumferential surface of the elastic piston in contact with the cylinder liner. The pit array; the pit array is composed of regularly arranged oval pits; the short axis direction of the oval pit is parallel to the axial direction of the elastic piston; the ratio of the short axis to the long axis of the oval pit is 0.5 to 0.75; the depth of the oval pit is 0.3 to 0.4 times the long axis of the oval pit. 2 . The highly wear-resistant and high-sealing piston according to claim 1 , wherein the area of the dimple array accounts for 15-30% of the circumferential area of the elastic piston. 3 . 3 . The highly wear-resistant and high-sealing piston according to claim 1 , wherein the distribution spacing in the direction of the long axis of the oval pits is 1.9 to 4 times that of the long axis of the oval pits. 4 . 4 . The highly wear-resistant and high-sealing piston according to claim 1 , wherein the distance between the array of elliptical dimples and the bottom end of the elastic piston is H, and H is the short axis of the elliptical dimples 4 . 3 to 8 times. 5 . The highly wear-resistant and high-sealing piston according to claim 1 , wherein the elliptical dimples are evenly distributed in the circumferential direction of the surface of the elastic piston. 6 . 6 . The piston with high wear resistance and high sealing according to claim 1 , wherein the elliptical recesses are distributed in a rhombus shape in the circumferential direction of the surface of the elastic piston. 7 . 7 . The highly wear-resistant and high-sealing piston according to claim 1 , wherein the elliptical dimples in the dimple array are distributed at equal intervals along the short axis direction thereof. 8 . 8 . The highly wear-resistant and high-sealing piston according to claim 8 , wherein the lengths of the long axis and the short axis of the elliptical pits in the pit array are equally different along the direction of the short axis. 9 . Variety. 9 . The piston with high wear resistance and high sealing according to claim 1 , wherein the array of pits provided on the circumferential surface of the elastic piston is processed by one or more of molds, numerical control, and laser processing. 10 . A combination of processing is made. 10 . The highly wear-resistant and high-sealing piston according to claim 1 , wherein the elastic piston is made of rubber, nylon or polyurethane. 11 .

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