High-temperature-resistant, high-pressure-resistant and wear-resistant plunger packing arc-shaped seal made of polyurethane

Abstract

The utility model relates to the technical field of plunger packing, in particular to a high-temperature-resistant, high-pressure-resistant and wear-resistant plunger packing arc-shaped seal made of polyurethane, which comprises an arc-shaped seal assembly, the arc-shaped seal assembly comprises an arc-shaped packing and a V-shaped packing, a connecting strip is fixedly connected on the outer wall of the arc-shaped packing and close to the position of the V-shaped packing, and the arc-shaped packing and the V-shaped packing are connected through the connecting strip. A connecting groove is formed in the position, corresponding to the connecting strip, of the outer wall of the V-shaped packing, and a high-temperature-resistant, high-pressure-resistant and wear-resistant plunger packing arc-shaped seal made of polyurethane is designed, so that the sealing performance is improved through an arc-shaped seal assembly in the device; the problems that an existing plunger packing arc-shaped seal made of a hydrogenated nitrile rubber material cannot effectively prevent sand-carrying fluid from penetrating and entering under the working condition of a high-pressure and high-temperature complex medium, sand inclusion is caused, a plunger and the seal are strained, and the service life is shortened are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of plunger packing, in particular to an arc-shaped seal of a plunger packing which is made of polyurethane and is resistant to high temperature, high pressure and wear. Background Art

[0002] At present, hydrogenated nitrile rubber (HNBR) is used in the arc seal of plunger packing in oil drilling. The plunger pump is an important device in the hydraulic system. It relies on the reciprocating motion of the plunger in the cylinder. The plunger punches the layer about 120 times in 1 minute, and the punching length is about 8 inches. The performance of the arc seal material is mainly wear resistance and good rebound. However, the existing plunger packing arc seal still has shortcomings. Specifically: the plunger packing arc seal made of hydrogenated nitrile rubber material cannot effectively prevent the sand-carrying liquid from penetrating under high-pressure, high-temperature and complex medium conditions, resulting in sand inclusion, straining the plunger and seal, and reducing the service life.

[0003] Therefore, there is a need for a high temperature, high pressure and wear-resistant plunger packing arc seal made of polyurethane to solve the problems raised in the above background technology. Utility Model Content

[0004] The utility model aims to provide a high temperature, high pressure and wear-resistant plunger packing arc seal made of polyurethane to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A high temperature, high pressure and wear-resistant plunger packing arc seal made of polyurethane comprises an arc seal assembly, wherein the arc seal assembly comprises an arc packing and a V-shaped packing, the outer wall of the arc packing is fixedly connected with a connecting strip near the V-shaped packing, and the outer wall of the V-shaped packing is provided with a connecting groove at a position corresponding to the connecting strip.

[0007] As a preferred solution of the utility model, two groups of V-shaped packings are provided, and the two groups of V-shaped packings are glued together.

[0008] As a preferred solution of the utility model, the shape of the connecting groove is matched with the shape of the connecting strip, and the connecting strip is designed as a ring structure.

[0009] As a preferred solution of the utility model, the arc-shaped packing and the connecting strip are both made of PPDI tetrahydrofuran polyurethane material, and the arc-shaped packing is cast and then machined to a specified size.

[0010] As a preferred solution of the utility model, the V-shaped packing is made of PU rubber, and the connection mode between the connecting strip and the connecting groove is a sliding connection.

[0011] As a preferred solution of the utility model, the surfaces of the arc-shaped packing and the V-shaped packing are sprayed with heat-insulating coating.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. In the utility model, a high-temperature, high-pressure and wear-resistant plunger packing arc seal made of polyurethane is designed, and the arc seal assembly in the device is used to improve the sealing performance. The arc packing is made of PDI tetrahydrofuran polyurethane material and is cast and then machined to the product size. It can withstand high temperature and high pressure, and has a low wear coefficient, effectively preventing the sand-carrying liquid from penetrating into it. At the same time, the arc packing has outstanding high-temperature solvent resistance and outstanding resilience, so that the arc seal assembly has low wear and reduces endogenous heat. During use, the arc seal assembly has excellent acid and alkali resistance and hydrolysis resistance, and can still maintain good dynamic performance under high temperature and high pressure conditions. It is suitable for working in medium-pressure complex environments, and solves the problem that the plunger packing arc seal made of hydrogenated nitrile rubber material cannot effectively prevent the sand-carrying liquid from penetrating into it under high-pressure, high-temperature and complex medium conditions, resulting in sand inclusion, straining the plunger and seal, and reducing the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the front section structure of the utility model;

[0015] Figure 2 This is a front cross-sectional view of the arc-shaped packing of the utility model;

[0016] Figure 3 This is a front cross-sectional view of the V-shaped packing of the utility model.

[0017] In the figure: 1, arc-shaped seal assembly; 101, arc-shaped packing; 102, V-shaped packing; 103, connecting strip; 104, connecting groove. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0019] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0020] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be a central element. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this article includes any and all combinations of one or more related listed items.

[0022] For examples, see Figure 1-3 , the utility model provides a technical solution:

[0023] A high temperature, high pressure and wear-resistant plunger packing arc seal made of polyurethane, comprising an arc seal assembly 1, the arc seal assembly 1 comprising an arc packing 101 and a V-shaped packing 102, a connecting strip 103 is fixedly connected to the outer wall of the arc packing 101 and at a position close to the V-shaped packing 102, and a connecting groove 104 is opened on the outer wall of the V-shaped packing 102 and at a position corresponding to the connecting strip 103;

[0024] Two groups of V-shaped packings 102 are provided, and the two groups of V-shaped packings 102 are glued together, the shape of the connecting groove 104 is adapted to the shape of the connecting strip 103, the connecting strip 103 is designed as a ring structure, the arc packing 101 and the connecting strip 103 are both made of PPDI tetrahydrofuran polyurethane material, and the arc packing 101 is cast and then machined to a specified size, the V-shaped packing 102 is made of pudding rubber, the connection mode of the connecting strip 103 and the connecting groove 104 is a sliding connection, the surfaces of the arc packing 101 and the V-shaped packing 102 are sprayed with heat insulation coating, and the arc packing 101 and the V-shaped packing 102 are both sprayed with heat insulation coating. 1 is made of PDI tetrahydrofuran polyurethane material and is cast and then machined to product size. It can withstand high temperature and high pressure, and has a low wear resistance coefficient, effectively blocking the infiltration of sand-carrying liquid. At the same time, the arc packing 101 has outstanding high-temperature solvent resistance and resilience, so that the arc sealing assembly 1 has low wear and reduces endogenous heat. During use, the arc sealing assembly 1 has excellent acid and alkali resistance and hydrolysis resistance, and can still maintain good dynamic performance under high temperature and high pressure environment. It is suitable for working in medium-pressure complex environment. The V-shaped packing 102 on the arc packing 101 can further improve the sealing performance of the arc packing 101.

[0025] Working process of the utility model: when the arc seal designed by the present invention is in operation and is made of polyurethane and resistant to high temperature, high pressure and wear, the arc packing 101 is made of PDI tetrahydrofuran polyurethane material and is cast and then machined to the product size. It can withstand high temperature and high pressure, and has a low wear coefficient, and can effectively block the penetration of sand-carrying liquid. At the same time, the arc packing 101 has outstanding high temperature solvent resistance and outstanding resilience, so that the arc seal assembly 1 has low wear and reduces endogenous heat. During use, the arc seal assembly 1 has excellent acid and alkali resistance and hydrolysis resistance, and can still maintain good dynamic performance under high temperature and high pressure environment, and is suitable for operation in medium pressure and complex environment. The V-shaped packing 102 on the arc packing 101 can further improve the sealing performance of the arc packing 101.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high temperature, high pressure and wear resistant plunger packing arc seal made of polyurethane, comprising an arc seal assembly (1), characterized in that: The arc-shaped sealing assembly (1) comprises an arc-shaped packing (101) and a V-shaped packing (102); a connecting strip (103) is fixedly connected to the outer wall of the arc-shaped packing (101) at a position close to the V-shaped packing (102); and a connecting groove (104) is provided on the outer wall of the V-shaped packing (102) at a position corresponding to the connecting strip (103).

2. According to claim 1, a high temperature and high pressure wear-resistant plunger packing arc seal made of polyurethane is characterized by: The V-shaped packing (102) is provided in two groups, and the two groups of V-shaped packing (102) are glued together.

3. The high temperature and high pressure wear-resistant plunger packing arc seal made of polyurethane according to claim 1, characterized in that: The shape of the connecting groove (104) is compatible with the shape of the connecting strip (103), and the connecting strip (103) is designed as a ring-shaped structure.

4. The high temperature and high pressure wear-resistant plunger packing arc seal made of polyurethane according to claim 1, characterized in that: The arc-shaped packing (101) and the connecting strip (103) are both made of PPDI tetrahydrofuran polyurethane material, and the arc-shaped packing (101) is cast and then machined to a specified size.

5. The high temperature and high pressure wear-resistant plunger packing arc seal made of polyurethane according to claim 1, characterized in that: The V-shaped packing (102) is made of PU rubber, and the connection between the connecting strip (103) and the connecting groove (104) is a sliding connection.

6. The high temperature and high pressure wear-resistant plunger packing arc seal made of polyurethane according to claim 1, characterized in that: The surfaces of the arc-shaped packing (101) and the V-shaped packing (102) are sprayed with heat-insulating paint.

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