Oilfield pumping unit packing seals

Abstract

This utility model discloses a packing seal for an oilfield pumping unit, including a packing rubber sealing ring and a packing box. The inner diameter of each ring of the packing rubber sealing ring has several spherical protrusions, and the outer diameter of each ring also has several annular spherical sealing protrusions. Shallow annular grooves are provided on the inner wall of the packing rubber sealing ring between adjacent spherical protrusions. The inner wall of the packing box has several annular recessed grooves, and the annular spherical sealing protrusions are respectively inserted into these recessed grooves. This utility model, by providing several spherical protrusions on the inner diameter of the packing rubber sealing ring, utilizes the contact sealing principle and interference fit to prevent small impurities from being carried out along the pumping rod during oil pumping. The shallow annular grooves between vertically adjacent spherical protrusions can accommodate small particulate impurities, minimizing damage to the packing line seal caused by impurities in the crude oil and extending the product's service life.

Description

Technical Field

[0001] This utility model relates to the field of oil pumping unit packing technology, and in particular to oilfield oil pumping unit packing seals. Background Technology

[0002] When the sucker rod of an oilfield pumping unit is working, it moves up and down reciprocatingly. Based on the reciprocating motion sealing design principle of rubber seals, it is necessary to consider the instability of the working environment of oil wells under high load, high pressure and high pressure. Special attention needs to be paid to the product structure design of packing rubber seals, the selection of rubber materials and the surface treatment of seals.

[0003] Existing packing rubber seals are prone to oil leakage due to the up-and-down reciprocating motion of the sucker rod during actual use, which affects the service life of the seals and increases the energy consumption of the pumping unit. This paper proposes a packing seal for oilfield pumping units to solve the above problems. Utility Model Content

[0004] In view of the shortcomings and defects in the existing technology, this utility model proposes a packing seal for oilfield pumping units. This invention addresses the technical problem that existing packing rubber seals in the background technology are prone to oil leakage due to long-term wear caused by the up-and-down reciprocating motion of the sucker rod during actual use, which affects the service life of the seal and increases the energy consumption of the pumping unit.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An oilfield pumping unit packing seal includes a packing rubber sealing ring and a packing box. The inner diameter of a single ring of the packing rubber sealing ring is provided with several spherical protrusions, and the outer diameter of a single ring of the packing rubber sealing ring is provided with several annular spherical sealing protrusions. The inner wall of the packing rubber sealing ring between two adjacent spherical protrusions is provided with shallow annular grooves. The inner wall of the packing box is provided with several annular embedded grooves, and several of the annular spherical sealing protrusions are respectively inserted into several annular embedded grooves.

[0007] Preferably, the plurality of spherical protrusions are distributed at equal intervals, and the plurality of annular spherical sealing protrusions are distributed at equal intervals.

[0008] Preferably, the packing rubber seal is a hydrogenated nitrile butadiene rubber product.

[0009] Preferably, the packing rubber seal is coated with an acrylic corrosion-resistant coating.

[0010] Compared with the prior art, the advantages of this utility model are as follows:

[0011] 1. By setting several spherical protrusions on the inner diameter of the packing rubber seal, the contact sealing principle and sealing interference are used to prevent small impurities from being carried out along the smooth rod during the oil extraction process. A shallow annular groove is set between vertically adjacent spherical protrusions to accommodate small particulate impurities, so as to minimize the damage of impurities in crude oil to the packing line seal and extend the service life of the product.

[0012] 2. By selecting imported HNBR material with excellent comprehensive physical and mechanical properties such as good oil resistance, high strength, acid resistance, alkali resistance and weather resistance, the packing rubber seal ring has the characteristics of low wear, good strength and good compression set. This improves the product's wear performance, compression resilience and self-lubricating performance, ensuring that the product is not prone to leakage under high load and long-term use, is easy to maintain and extends the service life of the seal.

[0013] 3. By setting matching annular spherical sealing protrusions and annular embedded grooves on the contact surfaces of the packing rubber sealing ring and the packing box, stress interaction is achieved, minimizing the difficulty of maintenance and installation while providing a sealing effect. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of the packing seal for an oilfield pumping unit proposed in this utility model;

[0015] Figure 2 This is a cross-sectional schematic diagram of the packing seal for an oilfield pumping unit proposed in this utility model;

[0016] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0017] In the diagram: 1. Packing rubber seal ring, 2. Packing box, 3. Spherical protrusion, 4. Annular spherical sealing protrusion, 5. Shallow annular groove, 6. Annular inner groove. Detailed Implementation

[0018] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Reference Figure 1-3 The packing seal for an oilfield pumping unit includes a packing rubber seal ring 1 and a packing box 2. The inner diameter of the single-ring ring of the packing rubber seal ring 1 has several spherical protrusions 3, and the outer diameter of the single-ring ring of the packing rubber seal ring 1 has several annular spherical sealing protrusions 4. The spherical protrusions 3 and 4 are evenly spaced. A shallow annular groove 5 is provided on the inner wall of the packing rubber seal ring 1 between adjacent spherical protrusions 3. The spherical protrusions 3 on the inner diameter of the packing rubber seal ring 1 utilize the contact sealing principle and interference fit to prevent small impurities from being carried out along the pumping rod during the oil pumping process. The shallow annular groove 5 between vertically adjacent spherical protrusions 3 can accommodate small particulate impurities, minimizing damage to the packing line seal caused by impurities in the crude oil and extending the product's service life.

[0021] The inner wall of the packing box 2 is provided with several annular recessed grooves 6, and several annular spherical sealing protrusions 4 are respectively inserted into the several annular recessed grooves 6. Matching annular spherical sealing protrusions 4 and annular recessed grooves 6 are provided on the contact surface between the packing rubber sealing ring 1 and the packing box 2 to achieve stress interaction, minimize the difficulty of maintenance and installation, and at the same time achieve a sealing effect. The packing rubber sealing ring 1 is a hydrogenated nitrile butadiene rubber product, using imported HNBR material with excellent comprehensive physical and mechanical properties such as good oil resistance, high strength, acid resistance, alkali resistance and weather resistance. This gives the packing rubber sealing ring 1 the characteristics of low wear, good strength and good compression set, improving the product's wear performance, compression resilience and self-lubricating performance, ensuring that the product is not prone to leakage under high load and long-term use, is easy to maintain, and extends the service life of the seal. The packing rubber sealing ring 1 is coated with an acrylic corrosion-resistant coating. After the production of the packing rubber sealing ring 1, the product surface is coated again to make the product surface smoother, further improve the product's wear resistance and extend the product's service life.

[0022] In use, this invention features several spherical protrusions 3 on the annular inner diameter of the packing rubber seal ring 1. Utilizing the contact sealing principle and interference fit, it prevents minute impurities from being carried out along the guide rod during oil extraction. Shallow annular grooves 5 are provided between vertically adjacent spherical protrusions 3 to accommodate small particulate impurities, minimizing damage to the packing line seal caused by impurities in the crude oil and extending the product's service life. Imported HNBR material with excellent comprehensive physical and mechanical properties, including good oil resistance, high strength, acid and alkali resistance, and weather resistance, is selected, giving the packing rubber seal ring 1 low wear, high strength, and good compressive strength. The features of this product improve its wear resistance, compression resilience, and self-lubricating properties, ensuring that it is not prone to leakage during long-term use under high loads, is easy to maintain, and extends the service life of the seals. Matching annular spherical sealing protrusions 4 and annular inner grooves 6 are set on the contact surfaces of the packing rubber seal ring 1 and the packing box 2 to achieve stress interaction, minimizing the difficulty of maintenance and installation while providing a sealing effect. After the packing rubber seal ring 1 is manufactured, the product surface is coated again to make the product surface smoother, further improving the product's wear resistance and extending its service life.

[0023] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. Oilfield pumping unit packing seal, comprising a packing rubber seal ring (1) and a packing box (2), characterized in that, The packing rubber sealing ring (1) has several spherical protrusions (3) on its single-ring inner diameter and several annular spherical sealing protrusions (4) on its single-ring outer diameter. The packing rubber sealing ring (1) has shallow annular grooves (5) on its annular inner wall between two adjacent spherical protrusions (3). The packing box (2) has several annular embedded grooves (6) on its annular inner wall. Several annular spherical sealing protrusions (4) are respectively inserted into several annular embedded grooves (6).

2. The oil field pumping unit packing seal of claim 1, wherein, The spherical protrusions (3) are arranged at equal intervals, and the annular spherical sealing protrusions (4) are arranged at equal intervals.

3. The oil field pumping unit packing seal of claim 1 wherein, The packing rubber seal (1) is a hydrogenated nitrile butadiene rubber product.

4. The oil field pumping unit packing seal of claim 1 wherein, The packing rubber seal (1) is coated with an acrylic corrosion-resistant coating.

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