A new type of packing for oil pumping units

Abstract

This application discloses a novel packing for oil pumping units, belonging to the technical field of oil pumping unit components. It includes a packing body comprising two semi-circular packing units, one and two, connected by a 90° rotation. The two adjacent packing units are joined together, forming a zigzag joint. This novel packing structure employs a split semi-circular joint with a zigzag staggered joint, resulting in strong sealing and stress dispersion. Alternating wear-resistant layers and grease grooves effectively resist wear and provide self-lubrication. A locking mechanism with slots and strips achieves axial and radial locking, ensuring precise assembly and torsional stability, and facilitating precise docking. Raised arc-shaped blocks enhance end-face sealing and bear loads, while a spiral arc-shaped cavity optimizes pressure distribution and buffers impacts. The aramid material is resistant to high-temperature corrosion. Overall, it achieves long service life, low maintenance, and high reliability, significantly improving oil pumping efficiency and reducing operation and maintenance costs.

Description

Technical Field

[0001] This application relates to the technical field of pumping unit components, and more specifically, to a new type of packing for pumping units. Background Art

[0002] As a core device for oil extraction, the dynamic seal between the polished rod and the stuffing box of the beam pumping unit is crucial. During the reciprocating up and down movement of the polished rod, the packing in the stuffing box system is subject to wear. Under long-term operation, it is easy to出现井口漏油情况 due to severe packing wear. Existing packings mostly adopt an integral structure or a simple splicing method. Among them, the integral packing structure is difficult to install and拆卸, and it is necessary to disconnect the upper end of the polished rod from the suspension rope, and then the packing is introduced or exported from the upper end of the polished rod. The simple splicing type packing structure wears quickly, resulting in frequent replacement. Especially when the splicing seams are on the same straight line, it is difficult to align during installation and is prone to loosening, and the sealing effect deteriorates rapidly with the extension of use time. This not only increases the maintenance cost but may also pose safety hazards due to oil leakage. In view of this, we propose a new type of packing for pumping units. Utility Model Content

[0003] 1. Technical Problems to be Solved

[0004] The purpose of this application is to provide a new type of packing for pumping units, which solves the technical problems in the above background art, and realizes that the new packing structure adopts a split semi-circular splicing,配合“几”形交错缝, with strong sealing performance and stress dispersion, the wear-resistant layer and the grease groove are alternately arranged, effectively resisting wear and self-lubricating, the clamping groove and clamping strip locking mechanism realizes axial and radial locking, ensuring precise assembly and anti-torsion stability, and facilitating precise docking assembly, the convex arc block strengthens the end face seal and bears the load, the spiral arc cavity optimizes the pressure distribution and buffers the impact, the aramid material is resistant to high temperature and corrosion, and the overall realizes the technical effects of long life, low maintenance, high reliability, significantly improving the pumping efficiency and reducing the operation and maintenance cost.

[0005] 2. Technical Solutions

[0006] The technical solution of this application provides a new type of packing for pumping units, including: a packing body, the packing body includes a semi-packing one and a semi-packing two that are spliced and connected, the adjacent upper and lower packing bodies are spliced and connected by rotating 90°, the semi-packing one and the semi-packing two are spliced to form a几形拼接缝, the几形拼接缝 of adjacent two packing bodies are arranged staggeredly, multiple wear-resistant layers are fixedly arranged on the inner arc surfaces of the semi-packing one and the semi-packing two, and multiple arc cavities are arranged inside the semi-packing one and the semi-packing two.

[0007] It should be noted that the part "出现井口漏油情况" in the original text seems to be incomplete or inaccurate in expression. I have translated it as best as possible according to the context. You may need to check and correct it if necessary.By adopting the above technical solution, the packing body is composed of a cylindrical sleeve structure formed by splicing two semi-circular packing units, creating a geometrical splice. This allows it to be stably fitted onto the outside of the polished rod of the pumping unit. Several packing units are placed sequentially inside the packing box, with adjacent packing units requiring a 90° rotation for precise alignment. The geometrical splices are staggered. Finally, the packing units are compressed by tightening the cap bolts at the end of the packing box. Axial preload causes the packing units to deform under pressure, ensuring a tight fit between the packing units and the inner wall of the packing box and the polished rod, thus filling any gaps and achieving a sealing effect. Compared to traditional packing... The straight-line splicing seam of the substrate avoids the problem of traditional substrate splicing seams being on the same straight line during long-term reciprocating motion, which can easily lead to poor sealing performance. At the same time, the inner wall of the substrate has a grease groove for injecting lubricating grease. Combined with a wear-resistant layer that is resistant to high temperature, high pressure and wear, the substrate maintains good sealing performance. When subjected to sudden axial impact, the arc-shaped cavity design can generate a deformation energy storage effect and then slowly release energy to avoid damage caused by rigid collision. This design successfully solves many drawbacks of existing technologies and has significant progressive value and application potential.

[0008] Optionally, both ends of the splicing surfaces of the first and second semicircular packing roots are provided with arc-shaped notches, and a first slot is provided at the arc-shaped notches. A first locking strip is fixedly provided on the splicing surfaces of the first and second semicircular packing roots in the middle. An arc-shaped splicing block matching the arc-shaped notch is fixedly provided on the second semicircular packing root, and a second locking strip matching the first slot is fixedly provided on the arc-shaped splicing block. A second slot matching the first locking strip is provided on the second semicircular packing root.

[0009] By adopting the above technical solution, the first semicircular packing has pre-set arc-shaped notches at both ends and a first slot is machined at the arc-shaped notches. Correspondingly, the second semicircular packing has matching arc-shaped splicing blocks and a second locking strip. The first locking strip is set on the splicing surface in the middle of the first semicircular packing. Correspondingly, the second semicircular packing has a second slot to accommodate the first locking strip. The mortise and tenon joint is achieved by splicing at both ends and the middle, which ensures that the two semicircles are quickly aligned with the central axis, reduces human error, and prevents displacement due to torque during operation.

[0010] Optionally, both ends of the first and second semicircular packings are fixed with an arc-shaped positioning block, and both ends of the first and second semicircular packings are provided with an arc-shaped positioning groove. The first semicircular packing is rotated 90°, and the arc-shaped positioning groove at the bottom end is engaged with the arc-shaped positioning block at the top end of the second semicircular packing.

[0011] By adopting the above technical solution, each end of the semicircular packing root one and the semicircular packing root two is provided with an arc-shaped positioning block and a corresponding arc-shaped positioning groove. When the two packing bodies are connected vertically, by rotating the upper packing body by 90°, the arc-shaped positioning groove and the corresponding arc-shaped positioning block are precisely engaged, so as to achieve precise connection of the two packing bodies in the axial direction. In addition to completing the radial locking of the packing bodies, an axial limiting function is added to prevent vertical movement.

[0012] Optionally, both the first and second semicircular packing roots are fixedly provided with raised arc-shaped blocks at their upper ends and spliced ​​together to form an annular convex structure. The bottom ends of both the first and second semicircular packing roots are provided with arc-shaped groove structures that match the raised arc-shaped blocks.

[0013] By adopting the above technical solution, the upper ends of the semicircular packing one and the semicircular packing two are provided with raised arc-shaped blocks, which together form a complete annular boss. Correspondingly, the other end is machined with an arc-shaped groove structure that matches it. When the high-pressure fluid tries to seep out from the gap, it will encounter the barrier formed by the boss, be forced to change its flow direction and consume energy, and further increase the sealing effect.

[0014] Optionally, the raised arc-shaped block is provided with roundness scale lines along its arc-shaped edge.

[0015] By adopting the above technical solution, construction workers can adjust the concentricity according to the scale of the raised arc block to ensure concentric assembly of each layer.

[0016] Optionally, the inner wall of the disc body is provided with multiple grease grooves, and the grease grooves and wear-resistant layers are alternately arranged.

[0017] By adopting the above technical solution, lubricant can be added by setting a grease tank. With the stirring effect generated by the movement of the polished rod, the lubricating grease gradually migrates to the friction interface to form a dynamic oil film. Fine particles or impurities generated by wear are trapped in the tank instead of entering the working surface, maintaining a low coefficient of friction.

[0018] Optionally, the wear-resistant layer is made of aramid packing material.

[0019] By adopting the above technical solution and selecting aramid fiber as the raw material for the wear-resistant layer, it resists the erosion of acids, alkalis and other corrosive media in crude oil, provides strong shear resistance, and can maintain a low wear rate even under dry friction conditions.

[0020] Optionally, the arc-shaped cavity within the disc body has an overall spiral structure.

[0021] By adopting the above technical solution, the internal multi-layered arc-shaped cavity is designed as a spiral upward shape. When subjected to a sudden axial impact force, the spiral cavity generates a deformation energy storage effect and then slowly releases energy to avoid damage caused by rigid collision.

[0022] 3. Beneficial effects

[0023] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0024] 1. The split semi-circular splicing design, multi-layer composite structure, and precise positioning and locking mechanism enable accurate and rapid assembly into a stable packing structure, reducing installation difficulty and time costs. It can achieve radial and axial locking functions after the packing box is installed to prevent vertical movement. The flexibility of the semi-circular structure allows for slight radial deformation, compensating for gap changes caused by polished rod vibration and maintaining long-term stable contact. The staggered arrangement of the geometric splicing seams disrupts the liquid permeation path. Combined with the pressure dispersion effect of the multi-layer arc-shaped cavity, it absorbs axial impact force and balances pressure distribution, reducing the risk of fatigue damage and effectively preventing well fluid leakage. The 90° rotation stacking method ensures that the load is evenly transferred to the entire contact surface, avoiding local overload that could lead to cracking or deformation. The introduction of grease grooves and wear-resistant layers significantly reduces the direct wear of the polished rod on the substrate, making it particularly suitable for oil well environments with high sand content, effectively solving the problems of traditional packing products.

[0025] 2. The new packing has the characteristics of high wear resistance, self-lubrication, easy installation and long service life. It meets the requirements of long-term stable operation under harsh working conditions, successfully solves many drawbacks of existing technologies, and has significant progressiveness and application value. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a novel packing for an oil pumping unit disclosed in a preferred embodiment of this application;

[0027] Figure 2 This is an exploded structural diagram of a novel packing for an oil pumping unit disclosed in a preferred embodiment of this application.

[0028] Figure 3 This is an exploded structural diagram of a novel packing for an oil pumping unit disclosed in a preferred embodiment of this application.

[0029] Figure 4 This is a schematic diagram of the packing body connection structure of a novel packing for an oil pumping unit disclosed in a preferred embodiment of this application;

[0030] The labels in the diagram are as follows: 100, Packing core; 1, Semicircular packing core one; 11, First retaining strip; 12, Arc-shaped notch; 121, First retaining groove; 2, Semicircular packing core two; 21, Arc-shaped splicing block; 211, Second retaining strip; 22, Second retaining groove; 3, G-shaped splicing seam; 4, Grease groove; 5, Arc-shaped cavity; 6, Protruding arc-shaped block; 7, Arc-shaped positioning block; 8, Arc-shaped positioning groove; 9, Wear-resistant layer. Detailed Implementation

[0031] The present application will be further described in detail below with reference to the accompanying drawings.

[0032] Reference Figures 1 to 4 This application provides a novel packing for an oil pumping unit, comprising: a packing body 100, the packing body 100 including a semi-circular packing 1 and a semi-circular packing 2 connected by splicing; adjacent packing bodies 100 are rotated 90° to splice together; the semi-circular packing 1 and the semi-circular packing 2 are spliced ​​together to form a geometrical splice seam 3; the geometrical splice seams 3 of two adjacent packing bodies 100 are staggered; and multiple wear-resistant materials are fixedly provided on the inner arc surface of both the semi-circular packing 1 and the semi-circular packing 2. Layer 9, with multiple arc-shaped cavities 5 inside the semi-circular packing 1 and semi-circular packing 2, forms a cylindrical sleeve structure by splicing semi-circular packing 1 and semi-circular packing 2 together, creating a geometrical splice seam 3. This structure can be stably fitted onto the outside of the polished rod of the pumping unit. Several packing bodies 100 are placed sequentially inside the packing box, and adjacent packing bodies 100 need to be rotated 90° before being spliced ​​for precise alignment. The geometrical splice seams 3 are staggered. Finally, the packing box is fastened. The end cap bolts compress the substrate 100. Through axial preload, the substrate 100 is deformed by compression molding, ensuring that the substrate 100 is tightly fitted to the inner wall of the packing box and the guide rod without gaps. This fills the gaps and achieves a sealing effect. Compared with the straight joints of traditional packing, this substrate 100 avoids the traditional substrate 100 joints being on the same straight line during long-term reciprocating motion of the guide rod, which can easily lead to a deterioration in the sealing effect. At the same time, the inner wall of the substrate 100 is equipped with a grease groove 4 to inject lubricating grease. Combined with the high temperature, high pressure and wear-resistant layer 9, the substrate 100 still maintains good sealing performance. When subjected to sudden axial impact, the arc-shaped cavity 5 design can generate a deformation energy storage effect, and then slowly release energy to avoid damage caused by rigid collision. This successfully solves many drawbacks of existing technologies and has significant progressiveness and application value.

[0033] Reference Figure 2 and Figure 3Both ends of the splicing surfaces of semicircular packing root 1 and semicircular packing root 2 are provided with arc-shaped notches 12, and a first slot 121 is provided at the arc-shaped notches 12. A first locking strip 11 is fixedly provided on the splicing surface of semicircular packing root 1 and semicircular packing root 2 in the middle. An arc-shaped splicing block 21 matching the arc-shaped notch 12 is fixedly provided on semicircular packing root 2, and a second locking strip 211 matching the first slot 121 is fixedly provided on the arc-shaped splicing block 21. A second slot 22 matching the first locking strip 11 is provided on semicircular packing root 2. The two ends of the semicircular packing root 1 are pre-set with arc-shaped notches 12, and the first groove 121 is machined at the arc-shaped notches 12. Correspondingly, the semicircular packing root 2 is provided with matching arc-shaped splicing block 21 and second clamping strip 211. The first clamping strip 11 is provided on the splicing surface in the middle of the semicircular packing root 1. Correspondingly, the second groove 22 of the semicircular packing root 2 is provided to accommodate the first clamping strip 11. The two ends and the middle splicing method are used to make mortise and tenon joints to ensure that the two semicircles are quickly aligned with the central axis, reduce human error, and prevent displacement caused by torque during operation.

[0034] Reference Figure 2 and Figure 3 Both ends of the semicircular packing root 1 and the semicircular packing root 2 are fixed with an arc-shaped positioning block 7. Both ends of the semicircular packing root 1 and the semicircular packing root 2 are provided with an arc-shaped positioning groove 8. The semicircular packing root 1 is rotated 90° and the arc-shaped positioning groove 8 at the bottom end is engaged with the arc-shaped positioning block 7 at the top end of the semicircular packing root 2. Both the semicircular packing root 1 and the semicircular packing root 2 are provided with an arc-shaped positioning block 7 and a corresponding arc-shaped positioning groove 8 at the end. When the two packing root bodies 100 are connected vertically, by rotating the upper packing root body 100 by 90°, the arc-shaped positioning groove 8 is precisely engaged with the corresponding arc-shaped positioning block 7, so as to achieve precise connection of the two packing root bodies 100 in the axial direction. In addition to completing the radial locking of the packing root body 100, an axial limiting function is added to prevent vertical movement.

[0035] Reference Figure 2 and Figure 3 Both the upper ends of the first and second semicircular packing units are fixed with raised arc-shaped blocks 6, which are spliced ​​together to form an annular convex structure. The bottom ends of the first and second semicircular packing units are provided with arc-shaped groove structures that match the raised arc-shaped blocks 6. The upper ends of the first and second semicircular packing units are provided with raised arc-shaped blocks 6, which together form a complete annular boss. Correspondingly, the other end is machined with an arc-shaped groove structure that matches it. When the high-pressure fluid tries to seep out from the gap, it will encounter the barrier formed by the boss, be forced to change its flow direction and consume energy, and further increase the sealing effect.

[0036] Reference Figure 2 and Figure 3 The raised arc-shaped block 6 has roundness scale lines along its arc edge. Construction workers can adjust the concentricity according to the scale of the raised arc-shaped block 6 to ensure concentric assembly of each layer.

[0037] Reference Figure 2 and Figure 3 The inner wall of the substrate 100 is provided with multiple grease grooves 4, and the grease grooves 4 and the wear-resistant layer 9 are alternately arranged. By setting the grease grooves 4, lubricant can be added. With the stirring effect generated by the movement of the polished rod, the lubricating grease gradually migrates to the friction interface to form a dynamic oil film. Fine particles or impurities generated by wear are trapped in the grooves instead of entering the working surface, maintaining a low coefficient of friction.

[0038] Reference Figure 2 and Figure 3 The wear-resistant layer 9 is made of aramid packing material. Aramid fiber is used as the raw material for the wear-resistant layer 9 to resist the erosion of acids, alkalis and other corrosive media in crude oil, and provide strong shear resistance, so as to maintain a low wear rate even under dry friction conditions.

[0039] Reference Figure 2 and Figure 3 The arc-shaped cavity 5 inside the substrate 100 has a spiral structure. The internal multi-layer arc-shaped cavity 5 is designed as a spiral rising shape. When subjected to a sudden axial impact force, the spiral cavity generates a deformation energy storage effect and then slowly releases energy to avoid damage caused by rigid collision.

[0040] Working principle: When installing the packing body 100, firstly, the semi-circular packing root 1 and semi-circular packing root 2 are spliced ​​together using the arc-shaped splicing block 21. With the cooperation of the retaining strip and the retaining groove, a stable packing body 100 is formed and fitted onto the outside of the smooth rod. The first packing body 100 is placed inside the packing box. Then, the first packing body 100 is rotated 90° and inserted. Precise alignment is achieved through the arc-shaped positioning block 7 and the arc-shaped positioning groove 8. The above steps are repeated to stack multiple layers until the required height is reached. Finally, special sealant is injected to fill the remaining gaps, and the pressure bolts at the end of the packing box are tightened to compress the packing body 100. Through axial pre-tightening force, the packing body 100 is deformed by compression molding, so that the packing body 100 is tightly fitted with the inner wall of the packing box and the smooth rod without gaps, and the gaps are filled to achieve a tight seal. The sealing effect is achieved because the joint between the semi-circular packing 1 and the semi-circular packing 2 is a geometric joint 3, and the geometric joints 3 of the two adjacent packing bodies 100 are alternately set. This avoids the phenomenon that the joints of the traditional packing bodies 100 are on the same straight line during long-term reciprocating motion, which can easily lead to a deterioration in the sealing effect. At the same time, the inner wall of the packing body 100 can be filled with lubricating grease through the grease groove 4. Combined with the wear-resistant layer 9 which is resistant to high temperature, high pressure and wear, the packing body 100 still maintains good sealing performance. When subjected to a sudden axial impact force, the spiral cavity composed of the arc cavity 5 generates a deformation energy storage effect, and then slowly releases energy to avoid damage caused by rigid collision. This successfully solves many drawbacks of the existing technology and has significant progressiveness and application value.

Claims

1. A novel packing system for oil pumping units, characterized in that: It includes: a base body (100), the base body (100) includes a semi-circular packing root one (1) and a semi-circular packing root two (2) that are spliced ​​together. The upper and lower adjacent base bodies (100) are rotated 90° and spliced ​​together. The semi-circular packing root one (1) and the semi-circular packing root two (2) are spliced ​​together to form a geometric splice seam (3). The geometric splice seams (3) of two adjacent base bodies (100) are staggered. The inner arc surfaces of the semi-circular packing root one (1) and the semi-circular packing root two (2) are fixedly provided with multiple wear-resistant layers (9). The interior of the semi-circular packing root one (1) and the semi-circular packing root two (2) is provided with multiple arc-shaped cavities (5).

2. The novel packing for an oil pumping unit according to claim 1, characterized in that: Both ends of the splicing surfaces of the first semicircular packing root (1) and the second semicircular packing root (2) are provided with arc-shaped notches (12). A first slot (121) is provided at the arc-shaped notch (12). A first locking strip (11) is fixedly provided on the splicing surface of the first semicircular packing root (1) and the second semicircular packing root (2) in the middle. An arc-shaped splicing block (21) matching the arc-shaped notch (12) is fixedly provided on the second semicircular packing root (2), and a second locking strip (211) matching the first slot (121) is fixedly provided on the arc-shaped splicing block (21). A second slot (22) matching the first locking strip (11) is provided on the second semicircular packing root (2).

3. The novel packing for an oil pumping unit according to claim 1, characterized in that: Both ends of the first semicircular packing root (1) and the second semicircular packing root (2) are fixed with an arc-shaped positioning block (7). Both ends of the first semicircular packing root (1) and the second semicircular packing root (2) are provided with an arc-shaped positioning groove (8). The first semicircular packing root (1) is rotated 90°, and the arc-shaped positioning groove (8) at the bottom end is engaged with the arc-shaped positioning block (7) at the top end of the second semicircular packing root (2).

4. The novel packing for an oil pumping unit according to claim 1, characterized in that: Both the upper ends of the first semicircular disk root (1) and the second semicircular disk root (2) are fixed with raised arc-shaped blocks (6) and spliced ​​together to form an annular convex disk structure. The bottom ends of the first semicircular disk root (1) and the second semicircular disk root (2) are provided with arc-shaped groove structures that match the raised arc-shaped blocks (6).

5. The novel packing for an oil pumping unit according to claim 4, characterized in that: The raised arc-shaped block (6) has roundness scale lines along its arc edge.

6. The novel packing for an oil pumping unit according to claim 1, characterized in that: The inner wall of the substrate (100) is provided with a plurality of grease grooves (4), and the grease grooves (4) are alternately arranged with the wear-resistant layer (9).

7. The novel packing for an oil pumping unit according to claim 1, characterized in that: The wear-resistant layer (9) is made of aramid packing material.

8. The novel packing for an oil pumping unit according to claim 1, characterized in that: The arc-shaped cavity (5) inside the disk body (100) has an overall spiral structure.

Images