A seal cartridge packing

Abstract

This utility model discloses a sealing box packing, relating to the technical field of sealing box equipment, specifically a sealing box packing, which includes a packing rubber body with a frustum structure. An axial cavity is formed on the packing rubber body. The inner wall of the axial cavity is sprayed with a wear-resistant coating layer, the thickness of which is 0.1mm-0.3mm. A wire mesh is disposed inside the axial cavity, located between the inner wall of the axial cavity and the coating layer. The wire mesh is fixedly connected to the inner wall of the axial cavity. Symmetrically distributed first and second limiting teeth are installed on the wire mesh. The first and second limiting teeth restrict the axial movement of the coating layer. The dedicated wear-resistant coating layer directly serves as the friction surface, significantly increasing the wear life compared to pure rubber packing. The built-in wire mesh enhances the packing's resistance to pressure, impact, and deformation.

Description

Technical Field

[0001] This utility model relates to the field of sealing box equipment technology, specifically a sealing box packing. Background Technology

[0002] Packing, a long-established dynamic sealing element, is widely used in the sealing of shafts or reciprocating rods in equipment such as centrifugal pumps, compressors, valves, and agitators. Its core function is to fill the gap between moving and stationary parts with elastic material to prevent leakage of the working medium (such as liquids or gases).

[0003] Traditional packing is typically made of woven materials such as cotton, linen, aramid, carbon fiber, and graphite, impregnated with lubricants or polymers. In actual operating conditions, the inner surface of the packing directly rubs against the high-speed rotating or reciprocating shaft. This continuous friction leads to two main problems: first, the packing material itself is constantly worn away, causing the sealing gap to increase and eventually leading to leakage; second, particles generated by wear may contaminate the medium or damage the equipment. Especially in harsh operating conditions, with abrasive media, or in high-pressure, high-speed scenarios, the wear problem of packing is particularly prominent, not only shortening its service life and increasing maintenance costs and downtime, but also posing a challenge to production safety and continuity.

[0004] To improve wear resistance, existing technologies mostly focus on the material itself, such as using more wear-resistant fiber materials (e.g., carbon fiber, polytetrafluoroethylene fiber) or impregnating with more lubricating agents (e.g., graphite, molybdenum disulfide). However, these improvements are homogeneous throughout the material, and friction and wear still occur concentrated on the innermost surface in contact with the shaft. There is a bottleneck in improving overall performance, and the cost is high. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a sealing packing that can significantly enhance the wear resistance of the contact surface between the packing and the shaft, while ensuring its structural reliability and economy, thereby fundamentally extending the service life and sealing reliability of the packing under harsh working conditions.

[0006] The objective of this utility model is achieved through the following technical solution: A sealing packing includes a packing rubber body with a frustum structure, an axial cavity is formed on the packing rubber body, and the inner wall of the axial cavity is sprayed with a wear-resistant coating, the thickness of which is 0.1 mm to 0.3 mm.

[0007] Preferably, a wire mesh is provided inside the axial cavity, the wire mesh is located between the inner wall of the axial cavity and the sprayed coating, and the wire mesh is fixedly connected to the inner wall of the axial cavity.

[0008] Preferably, the wire mesh is equipped with symmetrically distributed first and second limiting toothed plates, which are used to restrict the axial movement of the sprayed coating.

[0009] Preferably, the first limiting toothed plate includes a first base plate, the first base plate abutting the wire mesh against the inner wall of the axial cavity by a first fastener, and the second limiting toothed plate includes a second base plate, the second base plate abutting the wire mesh against the inner wall of the axial cavity by a second fastener.

[0010] Preferably, the first base plate is provided with a first toothed rack, and the second base plate is provided with a second toothed rack that cooperates with the first toothed rack. The spray coating covers the two toothed racks and completely covers the wire mesh.

[0011] The beneficial effects of this utility model are: In this application, a dedicated wear-resistant spray coating is used directly as the friction surface, which significantly increases the wear life compared to pure rubber packing. The built-in steel wire mesh enhances the packing's resistance to pressure, impact, and deformation, making it suitable for higher pressure conditions. The innovative limit tooth plate design solves the key technical problem of sprayed materials easily falling off in dynamic sealing. Mechanical interlocking ensures the long-term stability of the coating. Because the coating is not easily worn or detached, it can maintain good contact with the shaft for a long time, thereby maintaining a stable and reliable sealing effect. It is suitable for shaft sealing scenarios with harsh working conditions, high pressure, and high-speed reciprocating or rotating motion. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This utility model Figure 1 A schematic diagram of the cross-sectional structure; Figure 3 This is a schematic diagram of the wire mesh and the internal wall connection structure of the wire mesh in this utility model; Figure 4 This utility model Figure 3 Side view; Figure 5 This utility model Figure 4 Schematic diagram of the cross-sectional structure at point AA; In the figure, 1 is the packing rubber body; 101 is the axial cavity; 2 is the spray coating; 3 is the wire mesh; 4 is the first limiting tooth plate; 41 is the first base plate; 42 is the first rack; 5 is the second limiting tooth plate; 51 is the second base plate; and 52 is the second rack. Detailed Implementation

[0013] like Figures 1-5As shown, a sealing packing is provided, including a packing rubber body with a frustum structure. The main body is frustum shaped and has an internal axial cavity for passing through a shaft or rod that needs to be sealed. The axial cavity is formed on the packing rubber body, and the inner wall of the axial cavity is sprayed with a wear-resistant coating. The thickness of the coating is 0.1 mm to 0.3 mm, preferably 0.2 mm. Its main function is to directly contact the moving parts, providing excellent wear resistance and sealing performance, and extending the service life of the packing. Before spraying, the inner wall of the rubber cavity (especially the structure with wire mesh and toothed plates installed) must undergo strict surface treatment, such as cleaning and degreasing. Sandblasting or the use of a special primer ensures strong adhesion of the coating. Spraying techniques include air spraying, airless spraying, or more advanced electrostatic spraying to ensure a uniform film is formed on the complex internal cavity surface. The coating is a composite coating with polyamide-imide (PAI) or epoxy resin as the base material, polytetrafluoroethylene (PTFE) as the lubricating phase, and nano-alumina or silicon carbide ceramic particles as the wear-resistant reinforcing phase. This cleverly balances adhesion (resin), lubricity (PTFE), and extreme wear resistance (ceramic particles). The advantages of the designed "wire mesh + limiting tooth plate" structure significantly improve the performance and service life of the packing products.

[0014] To improve the adhesion of the sprayed coating and the overall structural stability, the solution includes the following preferred reinforcement structures: Preferably, a wire mesh is provided inside the axial cavity, embedded between the inner wall of the axial cavity and the wear-resistant spray coating. The wire mesh is fixedly connected to the inner wall of the axial cavity as a reinforcing rib, integrated with the rubber body, greatly improving the structural strength and extrusion resistance of the packing matrix and preventing deformation and damage under high pressure. Symmetrically distributed first and second limiting toothed plates are installed on the wire mesh. The first and second limiting toothed plates are used to restrict the axial movement of the spray coating, mainly for mechanically locking the wire mesh, limiting and preventing the wear-resistant spray coating from moving or falling off in the axial direction (i.e., along the direction of axial movement). The first limiting toothed plate includes a first base plate as a base fixing plate. The first base plate uses first fasteners (such as screws, rivets, or fixation through vulcanization) to abut the wire mesh against the inner wall of the axial cavity. The first fasteners pass through the first base plate to press and fix the wire mesh to the inner wall of the axial cavity. The limiting toothed plate includes a second base plate, which abuts the wire mesh against the inner wall of the axial cavity via a second fastener. A first toothed rack is provided on the first base plate, which is vertically arranged on the first base plate and has a serrated or rough surface. A second toothed rack is provided on the second base plate, which is vertically arranged on the second base plate and its structure is mutually compatible with the first toothed rack (the abutting surface faces the center to limit the axial displacement of the sprayed coating). The sprayed coating covers the two toothed racks and completely covers the wire mesh. The wire mesh is clamped between the first / second base plate and the inner wall of the axial cavity. The first and second toothed racks stand opposite each other, forming a "clamping" rough area. During spraying, the wear-resistant sprayed coating completely covers and wraps the wire mesh and the first and second toothed racks. After curing, the coating embedded in the gaps between the toothed racks forms a strong mechanical interlocking structure, thereby effectively anchoring the sprayed coating to the substrate and eliminating the possibility of axial movement.

Claims

1. A sealing box packing, characterized in that, The device includes a packing rubber body (1) with a frustum structure. An axial cavity (101) is provided on the packing rubber body (1). The inner wall of the axial cavity (101) is sprayed with a wear-resistant coating (2). The thickness of the coating (2) is 0.1 mm to 0.3 mm.

2. The sealing box packing according to claim 1, characterized in that, The axial cavity (101) is provided with a wire mesh (3), which is located between the inner wall of the axial cavity (101) and the spray coating (2). The wire mesh (3) is fixedly connected to the inner wall of the axial cavity (101).

3. The sealing box packing according to claim 2, characterized in that, The wire mesh (3) is equipped with a first limiting toothed plate (4) and a second limiting toothed plate (5) that are symmetrically distributed. The first limiting toothed plate (4) and the second limiting toothed plate (5) are used to restrict the axial movement of the sprayed coating (2).

4. The sealing box packing according to claim 3, characterized in that, The first limiting toothed plate (4) includes a first base plate (41), which abuts the wire mesh (3) against the inner wall of the axial cavity (101) by a first fastener. The second limiting toothed plate (5) includes a second base plate (51), which abuts the wire mesh (3) against the inner wall of the axial cavity (101) by a second fastener.

5. A sealing box packing according to claim 4, characterized in that, The first base plate (41) is provided with a first toothed rack (42), and the second base plate (51) is provided with a second toothed rack (52) that cooperates with the first toothed rack (42). The spray coating (2) covers the two toothed racks and completely covers the wire mesh (3).

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