Adjustable valve graphite gasket

Abstract

The utility model discloses an adjustable valve graphite sealing gasket, including outer ring graphite pad, middle ring graphite pad and inner ring graphite pad, the middle ring graphite pad detachably is sleeved in the outside of inner ring graphite pad, and the outer ring graphite pad detachably is sleeved in the outside of middle ring graphite pad, be provided with first cavity in the outer ring graphite pad, be provided with second cavity in the middle ring graphite pad, be provided with third cavity in the inner ring graphite pad, the bottom of outer ring graphite pad, middle ring graphite pad and inner ring graphite pad all is provided with honeycomb hole structure, the utility model discloses through the detachable nesting design of outer ring, middle ring, inner ring, and the connection stability is enhanced to the collocation card strip and the slot, through the cavity buffering adaptation in each ring, the weight reduction heat insulation, through annular metal net makes up graphite strength short board, through honeycomb hole structure compensation deformation, enhances the resistance to damage, while reserving the excellent sealing property of graphite, realizes the flexible adjustment of specification, and the universality of sealing pad, working condition adaptability, structural reliability and service life are improved greatly.

Description

Technical Field

[0001] This utility model relates to the field of graphite gasket technology, and in particular to an adjustable valve graphite gasket. Background Technology

[0002] Graphite gaskets, with their excellent high-temperature resistance, corrosion resistance, and good compression resilience, are widely used in valve sealing applications in industries such as petrochemicals, power, and metallurgy, and are key components for ensuring the sealing performance of fluid transport in equipment.

[0003] However, traditional graphite gaskets are mostly one-piece structures, which have significant limitations: on the one hand, their specifications are fixed and need to be customized for valve sealing cavities of different sizes, resulting in poor versatility and increased spare parts inventory costs for enterprises; on the other hand, if the gasket is locally worn, corroded, or cracked, the entire gasket needs to be replaced, which not only increases maintenance costs but also prolongs equipment downtime; in addition, traditional graphite gaskets themselves are relatively weak and are prone to creep, excessive compression, or even cracking under installation compression or long-term high temperature and high pressure conditions, affecting sealing stability; and their adaptability to minor deformations of the sealing surface is insufficient, which can easily lead to leakage risks due to loose fit. Therefore, in view of the above situation, there is an urgent need to develop an adjustable valve graphite gasket with a detachable nested design of outer, middle and inner rings, enhanced connection stability with locking strips and grooves, buffered and adapted by the cavities in each ring for weight reduction and heat insulation, compensated for the strength shortcomings of graphite with an annular metal mesh, and compensated for deformation and enhanced damage resistance with a honeycomb structure. While retaining the excellent sealing performance of graphite, it also allows for flexible adjustment of specifications, greatly improving the gasket's versatility, adaptability to operating conditions, structural reliability and service life, in order to overcome the shortcomings in current practical applications and meet current needs. Utility Model Content

[0004] The purpose of this invention is to provide an adjustable valve graphite sealing gasket to solve the problems mentioned in the background art.

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

[0006] An adjustable valve graphite sealing gasket includes an outer ring graphite gasket, a middle ring graphite gasket, and an inner ring graphite gasket. The middle ring graphite gasket is detachably fitted over the outer side of the inner ring graphite gasket, and the outer ring graphite gasket is detachably fitted over the outer side of the middle ring graphite gasket. A first cavity is provided inside the outer ring graphite gasket, a second cavity is provided inside the middle ring graphite gasket, and a third cavity is provided inside the inner ring graphite gasket. Multiple first retaining strips are fixed to the inner side of the outer ring graphite gasket, and multiple first retaining grooves are provided on the middle ring graphite gasket for retaining the first retaining strips. Multiple second retaining strips are fixed to the inner side of the middle ring graphite gasket, and multiple second retaining grooves are provided on the inner ring graphite gasket for retaining the second retaining strips. A honeycomb structure is provided at the bottom of the outer ring graphite gasket, the middle ring graphite gasket, and the inner ring graphite gasket.

[0007] Preferably, a first annular metal mesh is fixed inside the outer graphite pad, a second annular metal mesh is fixed inside the middle graphite pad, and a third annular metal mesh is fixed inside the inner graphite pad.

[0008] Preferably, the edges of the first card strip are chamfered, and the edges of the second card strip are chamfered.

[0009] Preferably, the outer, middle, and inner graphite pads are all coated with a layer of polytetrafluoroethylene (PTFE) coating.

[0010] Preferably, the total height of the first card strip is half the thickness of the outer graphite pad.

[0011] Preferably, the total height of the second card strip is half the thickness of the middle circle graphite pad.

[0012] The beneficial effects of this utility model are as follows: This adjustable valve graphite gasket, composed of an outer, middle, and inner graphite gasket, forms a detachable multi-layered assembly. The overall specifications of the gasket can be flexibly adjusted according to the different dimensions of the valve sealing cavity and operating conditions, eliminating the need for individual customization for different valves and improving versatility. Furthermore, if a certain layer is worn or corroded, the entire gasket does not need to be replaced; only the corresponding layer needs to be replaced, significantly reducing maintenance costs and replacement difficulty. The cavity design of the first, second, and third cavities buffers deformation to adapt to the sealing surface gap, disperses pressure to prevent excessive graphite compression, reduces weight, provides auxiliary heat insulation, and reserves space for functional integration. The bottom honeycomb structure compensates for minor deformations of the sealing surface, reduces assembly pressure, and enhances creep and fracture resistance, ensuring sealing stability. In summary, this utility model, through its detachable nested design of outer, middle, and inner rings, combined with locking strips and grooves to enhance connection stability, utilizes the internal cavities of each ring for buffering, weight reduction, and heat insulation. It also compensates for the strength limitations of graphite through an annular metal mesh and compensates for deformation and enhances damage resistance through a honeycomb structure. While retaining the excellent sealing performance of graphite, it achieves flexible specification adjustments and reduced maintenance costs, significantly improving the versatility, adaptability to operating conditions, structural reliability, and service life of the sealing gasket. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 .

[0014] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 .

[0015] Figure 3 This is an exploded view of the present invention.

[0016] Figure 4 This is an internal sectional view of the present invention.

[0017] Figure 5 This is a perspective view of the graphite pad in the middle ring of this utility model.

[0018] Legend:

[0019] 1. Outer ring graphite pad; 101. First retaining strip; 102. First cavity; 103. First annular metal mesh; 2. Middle ring graphite pad; 201. Second retaining strip; 202. First retaining groove; 203. Second cavity; 204. Second annular metal mesh; 3. Inner ring graphite pad; 301. Second retaining groove; 302. Third cavity; 303. Third annular metal mesh; 4. Honeycomb structure. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] Specific implementation examples are given below.

[0022] See Figures 1-5 In this embodiment of the present invention, an adjustable valve graphite sealing gasket includes an outer ring graphite gasket 1, a middle ring graphite gasket 2, and an inner ring graphite gasket 3. The middle ring graphite gasket 2 is detachably fitted onto the outside of the inner ring graphite gasket 3, and the outer ring graphite gasket 1 is detachably fitted onto the outside of the middle ring graphite gasket 2.

[0023] The outer graphite pad 1 has a first cavity 102, the middle graphite pad 2 has a second cavity 203, and the inner graphite pad 3 has a third cavity 302. The cavity configuration can enhance the adaptability to the sealing surface gap by utilizing the deformation buffering capacity of the cavity, disperse pressure to avoid excessive compression or breakage of graphite, reduce weight, assist in heat insulation, and reserve space for functional integration.

[0024] The outer graphite pad 1 has a first annular metal mesh 103 fixed inside, the middle graphite pad 2 has a second annular metal mesh 204 fixed inside, and the inner graphite pad 3 has a third annular metal mesh 303 fixed inside. The first annular metal mesh 103, the second annular metal mesh 204, and the third annular metal mesh 303 respectively support the outer graphite pad 1, the middle graphite pad 2, and the inner graphite pad 3. The high strength and support of the metal mesh compensate for the shortcomings of graphite material, such as fragility and weak creep resistance.

[0025] The inner side of the outer graphite pad 1 is fixed with a plurality of first locking strips 101, the total height of the first locking strips 101 being half the thickness of the outer graphite pad 1. The middle graphite pad 2 is provided with a plurality of first slots 202 for locking the first locking strips 101. The stability of the connection between the outer graphite pad 1 and the middle graphite pad 2 is increased by the cooperation of the first locking strips 101 and the first slots 202.

[0026] Multiple second locking strips 201 are fixed on the inner side of the middle ring graphite pad 2. The total height of the second locking strips 201 is half the thickness of the middle ring graphite pad 2. Multiple second locking grooves 301 are provided on the inner ring graphite pad 3 to lock the second locking strips 201. The stability of the connection between the middle ring graphite pad 2 and the inner ring graphite pad 3 is increased by the cooperation of the second locking strips 201 and the second locking grooves 301.

[0027] The first card strip 101 has a chamfered edge so that it can be inserted into the first card slot 202, and the second card strip 201 has a chamfered edge so that it can be inserted into the second card slot 301.

[0028] The outer ring graphite pad 1, the middle ring graphite pad 2, and the inner ring graphite pad 3 are all coated with a layer of polytetrafluoroethylene (PTFE). The PTFE coating enhances the corrosion resistance of the graphite pads, effectively resisting the erosion of graphite by harsh media such as acids, alkalis, and organic solvents, and preventing material aging and failure.

[0029] The bottom of the outer ring graphite pad 1, the middle ring graphite pad 2, and the inner ring graphite pad 3 are all provided with a honeycomb hole structure 4. The honeycomb hole structure 4 provides buffering to compensate for the slight deformation of the sealing surface and reduce the assembly clamping force. It also enhances the creep resistance and fracture resistance of the graphite pad by relying on the support of the honeycomb hole structure 4, while maintaining its excellent sealing performance and improving the sealing stability and service life under complex working conditions.

[0030] Working principle: This adjustable valve graphite gasket consists of an outer graphite gasket 1, a middle graphite gasket 2, and an inner graphite gasket 3, forming a detachable multi-layer combination. The overall specifications (such as outer diameter) of the gasket can be flexibly adjusted according to different valve sealing cavity dimensions and operating conditions, eliminating the need for individual customization for different valves and improving versatility. Furthermore, if a layer is worn or corroded, only the corresponding layer needs to be replaced, without replacing the entire gasket, significantly reducing maintenance costs and replacement difficulty. The cavity design of the first cavity 102, the second cavity 203, and the third cavity 302 buffers deformation to adapt to the sealing surface gap, disperses pressure to prevent excessive graphite compression, reduces weight, provides auxiliary heat insulation, and reserves space for functional integration. The bottom honeycomb structure 4 compensates for minor deformation of the sealing surface, reduces assembly pressure, and enhances creep and fracture resistance, ensuring sealing stability.

[0031] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] 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. An adjustable valve graphite sealing gasket, characterized in that, It includes an outer ring graphite pad (1), a middle ring graphite pad (2), and an inner ring graphite pad (3). The middle ring graphite pad (2) is detachably fitted onto the outside of the inner ring graphite pad (3), and the outer ring graphite pad (1) is detachably fitted onto the outside of the middle ring graphite pad (2). The outer ring graphite pad (1) has a first cavity (102), the middle ring graphite pad (2) has a second cavity (203), and the inner ring graphite pad (3) has a third cavity (302). The outer ring graphite pad (1) has a first cavity (102), the middle ring graphite pad (2) has a second cavity (203), and the inner ring graphite pad (3) has a third cavity (302). Multiple first locking strips (101) are fixed on the inner side. Multiple first locking grooves (202) for locking the first locking strips (101) are provided on the middle ring graphite pad (2). Multiple second locking strips (201) are fixed on the inner side of the middle ring graphite pad (2). Multiple second locking grooves (301) for locking the second locking strips (201) are provided on the inner ring graphite pad (3). The bottom of the outer ring graphite pad (1), the middle ring graphite pad (2) and the inner ring graphite pad (3) are all provided with a honeycomb hole structure (4).

2. The adjustable valve graphite sealing gasket according to claim 1, characterized in that, The outer graphite pad (1) has a first annular metal mesh (103) fixed inside, the middle graphite pad (2) has a second annular metal mesh (204) fixed inside, and the inner graphite pad (3) has a third annular metal mesh (303) fixed inside.

3. The adjustable valve graphite sealing gasket according to claim 1, characterized in that, The first card strip (101) has a chamfered edge, and the second card strip (201) has a chamfered edge.

4. The adjustable valve graphite sealing gasket according to claim 1, characterized in that, The outer ring graphite pad (1), the middle ring graphite pad (2), and the inner ring graphite pad (3) are all coated with a layer of polytetrafluoroethylene.

5. The adjustable valve graphite sealing gasket according to claim 1, characterized in that, The total height of the first card strip (101) is half the thickness of the outer graphite pad (1).

6. The adjustable valve graphite sealing gasket according to claim 1, characterized in that, The total height of the second card strip (201) is half the thickness of the middle circle graphite pad (2).

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