A wear-resistant oil pump packing

Abstract

This utility model relates to the field of sealing technology, specifically to a wear-resistant packing for a pumping unit. It includes a rubber substrate, with an anti-corrosion layer and a wear-resistant layer sequentially arranged from the inside out on the outer side of the rubber substrate. An upper rubber layer is bonded and sealed to the upper end of the wear-resistant layer, and an upper adhesive layer is coated on the upper end of the upper rubber layer. A lower rubber layer is bonded and sealed to the lower end of the wear-resistant layer, and a lower adhesive layer is coated on the lower end of the lower rubber layer. An insert rod is fixed inside the lower end of the rubber substrate, with its lower end penetrating the anti-corrosion layer and the wear-resistant layer and extending into the lower rubber layer. Multiple support frames are arranged inside the rubber substrate, and the support frames are fixedly connected to an elastic steel strip. The wear-resistant layer, anti-corrosion layer, and rubber substrate of this utility model form a gradient protection system. Combined with the flexible wrapping of the bonding interface by the upper and lower rubber layers, it achieves dual isolation from chemical corrosion and mechanical wear, ensuring long-term sealing integrity.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, specifically to a wear-resistant oil pump packing. Background Technology

[0002] Oil pumping units are machines used to extract oil. They are the main lifting equipment in an oil pumping system. The wellhead of an oil pumping unit usually needs to be sealed, and packing is used for this purpose. By using packing, the wellhead of the oil pumping unit can be sealed to prevent oil from being discharged through the inlet during the pumping process and causing pollution to the surrounding environment.

[0003] Patent document CN215761594U discloses a corrosion-resistant pumping unit wellhead packing, comprising a wear-resistant layer, a body, and a second end. The body has an external anti-corrosion layer, and the anti-corrosion layer has an external wear-resistant layer. A snap-fit ​​structure is located below the wear-resistant layer. A reinforcing structure is located in the middle of the body. A first end is located at the top of one end of the body, and a second end is located at the bottom of the other end. In use, the packing is spirally wound in a packing box. When using this structure, after the packing is wound in a ring, it is first squeezed vertically. This squeezing causes the inserts between adjacent layers to be inserted into the lower packing layer, thus improving the tightness between the two layers. However, after inserting the inserts into the lower packing layer, the inserts can damage the wear-resistant and anti-corrosion layers of the lower packing layer. Under normal circumstances, the wear-resistant layer is not easily punctured. Due to the presence of the inserts, gaps can easily form between the upper and lower packing layers, affecting the sealing effect. Utility Model Content

[0004] The main purpose of this invention is to provide a wear-resistant pumping unit packing that can improve the sealing effect and enhance the stability of the upper and lower packing layers after installation.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A wear-resistant pumping unit packing includes a rubber matrix. From the inside out, an anti-corrosion layer and a wear-resistant layer are sequentially arranged on the outer side of the rubber matrix. An upper rubber layer is bonded and sealed to the upper end of the wear-resistant layer, and an upper adhesive layer is coated on the upper end of the upper rubber layer. A lower rubber layer is bonded and sealed to the lower end of the wear-resistant layer, and a lower adhesive layer is coated on the lower end of the lower rubber layer. An insert rod is fixed inside the lower end of the rubber matrix. The lower end of the insert rod penetrates the anti-corrosion layer and the wear-resistant layer and extends into the lower rubber layer. Multiple support frames are arranged inside the rubber matrix. The support frames are fixedly connected to an elastic steel strip. Each support frame includes two opposing arc-shaped rods. The middle of each arc-shaped rod protrudes outward from the rubber matrix. The ends of the two arc-shaped rods are fixedly connected by end rods. The middle of one of the arc-shaped rods is fixedly connected to the elastic steel strip. The height of the elastic steel strip is lower than the height of the support frame.

[0007] Specifically, an upper release paper is attached to the upper end of the upper adhesive layer, and a lower release paper is attached to the lower end of the lower adhesive layer.

[0008] Specifically, the upper end of the insertion rod is thickened, and the lower end of the insertion rod is pointed.

[0009] Specifically, each of the two arc-shaped rods of the support frame has multiple inner rings fixed on opposite sides, and the inner rings on the support frame correspond one-to-one, with the core rope passing through the corresponding inner rings.

[0010] Specifically, the core rope is a polyester cord.

[0011] Specifically, the thickness of the wear-resistant layer portion closer to the elastic steel strip is greater than the thickness of the wear-resistant layer portion farther from the elastic steel strip.

[0012] Specifically, the rubber matrix is ​​spirally wound, and the elastic steel strip is spirally wound.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. The insert rod penetrates the wear-resistant layer and extends to the lower rubber layer at its lower end. During insertion, it only pierces the upper rubber layer of the adjacent packing, avoiding damage to the wear-resistant and anti-corrosion layers beneath the insert rod, while enhancing the mechanical interlocking of the upper and lower layers. The thickened upper end of the insert rod increases anchoring force, while the pointed tip reduces insertion resistance, achieving stable embedding without damaging the wear-resistant and anti-corrosion layers. The upper and lower adhesive layers are protected by release paper. During installation, after peeling off the release paper, adjacent packings are directly bonded together, forming a continuous adhesive interface, significantly improving sealing reliability.

[0015] 2. The inner arc-shaped rod, in conjunction with the elastic steel strip, undergoes centripetal deformation when the packing is under pressure. This pushes the inner wear-resistant layer tightly against the surface of the smooth rod, dynamically compensating for wear gaps and maintaining stable sealing pressure. The height of the elastic steel strip is lower than that of the support frame, ensuring that pressure is preferentially transmitted to the sealing contact surface during deformation, avoiding stress concentration caused by excessive structural rigidity. The wear-resistant layer near the elastic steel strip is thickened to specifically enhance the wear resistance of the friction area with the smooth rod, extending service life, while the outer layer is thinned to reduce material redundancy costs.

[0016] 3. The core rope runs through the inner ring of the support frame to form a mesh skeleton, which improves the tensile and shear resistance of the rubber matrix and prevents interlayer peeling or breakage caused by frequent deformation.

[0017] 4. The rubber substrate and the elastic steel strip are spirally wound to fit the installation requirements of the packing box, avoiding uneven local stress caused by manual winding, simplifying the operation process and reducing installation errors.

[0018] 5. The wear-resistant layer, anti-corrosion layer, and rubber matrix form a gradient protection system. Combined with the flexible wrapping of the bonding interface by the upper and lower rubber layers, it achieves dual isolation from chemical corrosion and mechanical wear, ensuring long-term sealing integrity. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the packing spiral after it has been coiled.

[0020] Figure 2 for Figure 1 A schematic diagram of region A in the middle.

[0021] Figure 3 This is a schematic diagram of the support frame.

[0022] Figure 4 This is a schematic diagram showing the connection between a spirally wound elastic steel strip and a support frame.

[0023] The components in the attached diagram are named as follows: 1. Wear-resistant layer, 2. Upper rubber layer, 3. Upper release paper, 4. Lower rubber layer, 5. Lower release paper, 6. Anti-corrosion layer, 7. Arc rod, 8. End rod, 9. Inner ring, 10. Core rope, 11. Elastic steel strip, 12. Insert rod, 13. Rubber substrate. Detailed Implementation

[0024] 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.

[0025] Example 1: Refer to Figure 1 , Figure 2 and Figure 4As shown, a wear-resistant pumping unit packing includes a rubber substrate 13, with an anti-corrosion layer 6 and a wear-resistant layer 1 sequentially arranged on the outer side of the rubber substrate 13 from the inside to the outside.

[0026] The upper end of the wear-resistant layer 1 is bonded and sealed with an upper rubber layer 2. The upper end of the upper rubber layer 2 is coated with an upper adhesive layer, and the upper end of the upper adhesive layer is covered with an upper release paper 3. The lower end of the wear-resistant layer 1 is bonded and sealed with a lower rubber layer 4. The lower end of the lower rubber layer 4 is coated with a lower adhesive layer, and the lower end of the lower adhesive layer is covered with a lower release paper 5.

[0027] A rod 12 is fixed inside the lower end of the rubber substrate 13. The lower end of the rod 12 penetrates the anti-corrosion layer 6 and the wear-resistant layer 1 and extends into the lower rubber layer 4. The upper end of the rod 12 is thickened, and the lower end of the rod 12 is pointed.

[0028] Multiple support frames are provided inside the rubber matrix 13. The support frames are fixedly connected to the elastic steel strip 11. The support frame includes two oppositely arranged arc-shaped rods 7. The middle part of the arc-shaped rods 7 protrudes outward from the rubber matrix 13. The ends of the two arc-shaped rods 7 are fixedly connected by end rods 8. The middle part of one of the arc-shaped rods 7 is fixedly connected to the elastic steel strip 11. The height of the elastic steel strip 11 is lower than the height of the support frame.

[0029] Multiple inner rings 9 are fixed on opposite sides of the two arc-shaped rods 7 of the support frame. The inner rings 9 on the support frame correspond one-to-one, and the core rope 10 passes through the corresponding inner ring 9. The core rope 10 is a polyester cord.

[0030] The thickness of the wear-resistant layer 1 portion on the side closer to the elastic steel belt 11 is greater than the thickness of the wear-resistant layer 1 portion on the side farther away from the elastic steel belt 11.

[0031] When installing this packing, remove the upper release paper 3 and the lower release paper 5, allowing the packing to spirally coil inside the packing box, with the elastic steel strip 11 close to the axis of the packing box. After the packing is installed inside the packing box, the thickness of the wear-resistant layer 1 portion facing the center of the packing box is greater than the thickness of the wear-resistant layer 1 portion away from the center of the packing box. Therefore, this packing is more wear-resistant during oil extraction.

[0032] After the packing is installed in the packing box, the packing is squeezed by the end cap of the packing box. The packing parts of the upper and lower adjacent layers are squeezed against each other. The lower end of the insert rod 12 can be inserted into the upper rubber layer 2 of the lower packing part, and the lower adhesive layer of the upper packing part can be bonded together with the upper adhesive layer of the lower packing part. After the packing is installed, it can improve the connection stability between the upper packing part and the lower packing part.

[0033] After the packing is compressed inside the packing box, the middle parts of the arc-shaped rods 7 on the inner and outer sides can move towards the center of the packing box and towards the outside of the packing box, respectively. During the process of the middle part of the inner arc-shaped rod 7 protruding towards the center of the packing box, it can act on the elastic steel strip 11. The elastic steel strip 11 can increase the sealing pressure of the inner packing part on the smooth rod.

[0034] By setting the core rope 10, the structural strength of this packing can be improved, and its service life can be extended.

[0035] Example 2: Based on Example 1, referring to... Figure 1 and Figure 4 As shown, the rubber matrix 13 is spirally wound, and the elastic steel strip 11 is spirally wound.

[0036] The rubber matrix 13 and the elastic steel strip 11 are spirally wound. This packing is also spirally wound when it is not under stress, which makes it easy to install this packing into the packing box during installation.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A wear-resistant pumping machine packing comprising a rubber matrix (13), the outer side of which is provided with, from the inside to the outside, an anticorrosion layer (6) and a wear-resistant layer (1), characterized in that, The upper end of the wear-resistant layer (1) is bonded and sealed with an upper rubber layer (2), and the upper end of the upper rubber layer (2) is coated with an upper adhesive layer. The lower end of the wear-resistant layer (1) is bonded and sealed with a lower rubber layer (4), and the lower end of the lower rubber layer (4) is coated with a lower adhesive layer. The lower end of the rubber substrate (13) is fixed with a rod (12). The lower end of the rod (12) extends into the lower rubber layer (4) after penetrating the anti-corrosion layer (6) and the wear-resistant layer (1). Multiple support frames are provided in the rubber substrate (13). The support frames are fixedly connected to the elastic steel strip (11). The support frame includes two oppositely arranged arc rods (7). The middle part of the arc rod (7) protrudes outward from the rubber substrate (13). The ends of the two arc rods (7) are fixedly connected by end rods (8). The middle part of one of the arc rods (7) is fixedly connected to the elastic steel strip (11). The height of the elastic steel strip (11) is lower than the height of the support frame.

2. The wear resistant pumping unit packing of claim 1, wherein, The upper adhesive layer has an upper release paper (3) attached to its upper end, and the lower adhesive layer has a lower release paper (5) attached to its lower end.

3. The wear resistant pumping unit packing of claim 1, wherein, The upper end of the insertion rod (12) is thickened, and the lower end of the insertion rod (12) is pointed.

4. The wear resistant pumping unit packing of claim 1, wherein, Multiple inner rings (9) are fixed on opposite sides of the two arc-shaped rods (7) of the support frame. The inner rings (9) on the support frame correspond one-to-one, and the core rope (10) passes through the corresponding inner ring (9).

5. The wear resistant pumping unit packing of claim 4, wherein, The core rope (10) is a polyester cord.

6. The wear resistant pumping unit packing of claim 1 wherein, The thickness of the wear-resistant layer (1) portion near the elastic steel strip (11) is greater than the thickness of the wear-resistant layer (1) portion away from the elastic steel strip (11).

7. The wear-resistant pumping unit packing according to claim 1, characterized in that, The rubber matrix (13) is spirally wound, and the elastic steel strip (11) is spirally wound.

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