High-temperature combined type shaft seal structure
By designing a high-temperature combined shaft seal structure including metal outer ring, graphite sealing ring and metal flat gasket in a high-temperature and high-pressure environment, the problem of poor sealing performance of traditional sealing materials under high temperature and high pressure is solved, and a higher level of sealing performance is achieved durability and sealing properties, and reduce maintenance costs.
Patent Information
- Application Number
- CN202421222109.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-05-31
AI Technical Summary
In high temperature and high pressure environments, traditional sealing materials such as rubber have poor temperature resistance and low brittleness and hardness, resulting in unsatisfactory sealing performance and prone to gas leakage, which increases maintenance costs.
It adopts a high-temperature combined shaft seal structure, including metal outer ring, graphite seal ring and metal flat gasket. By designing multiple annular grooves and hanging springs and other components, the graphite seal ring is closely attached to the bearing under the thrust of the hanging spring. Achieve sealing under high temperature and high pressure.
It improves the durability and sealing performance of the shaft seal, reduces the impact of human factors on the installation quality of the shaft seal, reduces maintenance costs, and achieves the double sealing effect in high temperature and high pressure environments.
Smart Images
Figure CN222502662U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of shaft sealing of pneumatic valves and valves, and more specifically to a high-temperature combined shaft sealing structure. Background Art
[0002] In extreme working environments of high temperature and high pressure (temperature not less than 500°C and pressure not less than 20MPa), the shaft sealing problem of pneumatic valves and valves has always been a technical bottleneck in the industrial field; traditional sealing materials, such as rubber, have poor temperature resistance and cannot work stably under such high temperature conditions, so they are difficult to use in such scenarios.
[0003] Graphite materials are usually used for sealing in such environments. Although graphite has a certain stability in high temperature environments and can resist high temperature erosion, its inherent brittleness and low hardness make it very easy to break during installation, and it is not wear-resistant. New parts need to be replaced after a short period of use, which greatly increases maintenance costs. At the same time, the sealing performance of graphite materials is not ideal, and gas leakage is prone to occur, which further increases the difficulty of its application in high temperature and high pressure environments.
[0004] Therefore, it is necessary to develop a high-temperature combined shaft seal structure that improves the durability and sealing performance of the shaft seal, improves the valve assembly efficiency, improves the shaft seal installation quality, and reduces the impact of human factors on the shaft seal installation quality. Utility Model Content
[0005] The purpose of the utility model is to overcome the shortcomings of the above-mentioned background technology and provide a high-temperature combined shaft seal structure.
[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a high-temperature combined shaft seal structure, characterized in that it includes a metal outer ring, a graphite sealing ring and a metal flat gasket, the inside of the metal outer ring is sequentially provided with a first annular groove, a second annular groove, a third annular groove, a fourth annular groove and a fifth annular groove from top to bottom, the graphite sealing ring is located in the fourth annular groove, the metal flat gasket is located in the fifth annular groove, and a suspension spring is provided between the inner wall of the fourth annular groove and the graphite sealing ring.
[0007] In the above technical solution, a graphite retaining ring is arranged between the graphite sealing ring and the suspension spring.
[0008] In the above technical solution, the outer ring of the graphite retaining ring is provided with a groove, and the suspension spring is located in the groove.
[0009] In the above technical solution, a metal thin gasket and a corrugated gasket are arranged in sequence from top to bottom between the graphite sealing ring and the metal flat gasket.
[0010] In the above technical solution, the graphite sealing ring is provided with a graphite sealing ring opening.
[0011] In the above technical solution, the graphite sealing ring is provided in two pieces, and the openings of the two graphite sealing rings are installed opposite to each other at 180 degrees.
[0012] In the above technical solution, the graphite retaining ring is provided with a graphite retaining ring opening.
[0013] In the above technical solution, the outer diameter of the metal outer ring and the bearing hole are fitted with interference fit.
[0014] In the above technical solution, a V-shaped groove is provided on the bottom surface of the metal outer ring.
[0015] Compared with the prior art, the utility model has the following advantages:
[0016] 1) The utility model improves the durability and sealing performance of the shaft seal.
[0017] 2) The utility model improves the valve assembly efficiency, saves working procedures, improves the shaft seal installation quality, and reduces the influence of human factors on the shaft seal installation quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural schematic diagram of the utility model.
[0019] Figure 2 It is a schematic diagram of the structure of the metal outer ring.
[0020] Figure 3 Schematic diagram of the structure of a graphite sealing ring.
[0021] Figure 4 It is a schematic diagram of the structure of a metal flat gasket.
[0022] Figure 5 Schematic diagram of the structure of the graphite retaining ring.
[0023] Figure 6 Schematic diagram of the groove structure.
[0024] Figure 7 This is an installation diagram of the utility model in a high-temperature butterfly valve.
[0025] Figure 8 for Figure 7 Enlarged view of point A in the middle.
[0026] Among them, 1-metal outer ring, 11-first annular groove, 12-second annular groove, 13-third annular groove, 14-fourth annular groove, 15-fifth annular groove, 16-V-shaped groove, 2-graphite sealing ring, 21-graphite sealing ring opening, 3-metal flat gasket, 4-suspension spring, 5-graphite retaining ring, 51-groove, 52-graphite retaining ring opening, 6-metal thin gasket, 7-corrugated gasket. DETAILED DESCRIPTION
[0027] The following is a detailed description of the implementation of the utility model in conjunction with the accompanying drawings, but they do not constitute a limitation of the utility model and are only used as examples. At the same time, the advantages of the utility model will become clearer and easier to understand through the description.
[0028] Referring to the accompanying drawings, it can be seen that a high-temperature combined shaft seal structure is characterized in that it includes a metal outer ring 1, a graphite sealing ring 2 and a metal flat gasket 3, wherein the metal outer ring 1 is provided with a first annular groove 11, a second annular groove 12, a third annular groove 13, a fourth annular groove 14 and a fifth annular groove 15 from top to bottom, the graphite sealing ring 2 is located in the fourth annular groove 14, the metal flat gasket 3 is located in the fifth annular groove 15, and a suspension spring 4 is provided between the inner wall of the fourth annular groove 14 and the graphite sealing ring 2.
[0029] The diameter of the first annular groove 11 is smaller than that of the second annular groove 12 , the diameter of the third annular groove 13 is smaller than that of the first annular groove 11 , the diameter of the fourth annular groove 14 is larger than that of the third annular groove 13 , and the diameter of the fifth annular groove 15 is larger than that of the fourth annular groove 14 .
[0030] A graphite retaining ring 5 is arranged between the graphite sealing ring 2 and the suspension spring 4 .
[0031] The outer ring of the graphite retaining ring 5 is provided with a groove 51 , and the suspension spring 4 is located in the groove 51 .
[0032] A metal thin gasket 6 and a corrugated gasket 7 are arranged in sequence from top to bottom between the graphite sealing ring 2 and the metal flat gasket 3 .
[0033] The graphite sealing ring 2 is provided with a graphite sealing ring opening 21 .
[0034] The graphite sealing ring 2 is provided with two pieces, and the graphite sealing ring openings 21 of the two graphite sealing rings 2 are installed opposite to each other at 180 degrees.
[0035] The graphite retaining ring 5 is provided with a graphite retaining ring opening 52 .
[0036] The outer diameter of the metal outer ring 1 and the bearing hole are fitted with interference fit.
[0037] The bottom surface of the metal outer ring 1 is provided with a V-shaped groove 16 .
[0038] The metal flat gasket 3 encapsulates the graphite sealing ring 2, the graphite retaining ring 5, the metal thin gasket 6, the corrugated gasket 7, the suspension spring 4 and the like inside the metal outer ring 1 through the deformation of the V-shaped groove 16 of the metal outer ring 1.
[0039] The utility model is installed in the bearing hole of the valve and can seal the inner wall of the bearing and the shaft of the valve at the same time to prevent gas leakage.
[0040] The metal outer ring 1 is the basis of the entire shaft seal. Its outer diameter is fitted with the bearing hole by interference fit, ensuring a tight seal on the inner wall of the bearing hole. At the same time, the ring groove design on the metal outer ring 1 not only facilitates disassembly, but also provides convenience for subsequent maintenance and replacement.
[0041] The graphite sealing ring 2 is the key to the sealing performance. The graphite material has good stability in a high temperature environment and can maintain the sealing effect for a long time. A graphite retaining ring 5 is installed outside the two graphite sealing rings 2. A hanging spring 4 is designed at the groove 51 of the outer ring of the graphite retaining ring 5. Under the radial thrust of the hanging spring 4 and the graphite retaining ring 5, the graphite sealing ring 2 shrinks toward the center, thereby tightly hugging the shaft to achieve sealing at the valve shaft.
[0042] The two graphite sealing rings 2 are designed with a 0.2 mm graphite sealing ring opening 21 and are installed at 180° opposite to each other; the design of the graphite sealing ring opening 21 is to facilitate installation and to compensate for the wear of the graphite sealing ring 2 during use. As the wear of the inner diameter of the graphite sealing ring 2 increases, the hanging spring 4 enables the graphite sealing ring 2 to still be close to the valve shaft when the wear of the inner diameter increases, maintaining a good sealing state. The two graphite sealing ring openings 21 are installed at 180° opposite to each other to reduce the impact of the opening of the graphite sealing ring 2 on leakage.
[0043] The thrust of the corrugated gasket 7 at the bottom of the graphite sealing ring 2 makes the graphite sealing ring 2 close to the sealing surface of the metal outer ring 1, so that the shaft sealing assembly can maintain a good seal even under low pressure.
[0044] Example
[0045] Figure 7 and Figure 8 It is the application of shaft seal assembly in high-temperature butterfly valve. The butterfly valve flow channel housing is filled with high-temperature and high-pressure gas (temperature 500℃, pressure 20MPa). The upper end of the valve shaft is connected to the valve drive mechanism, which can be a motor or an actuator. The motor or the driven actuator needs to be in a lower temperature environment; the external environment of the valve must also be kept in a lower temperature environment. At this time, a seal needs to be designed at the bearing hole position of the valve housing to ensure that the high-temperature gas will not leak to the upper part or the external environment of the valve when the valve is closed, opened or in motion.
[0046] When the utility model is used in this configuration, the metal outer ring 1 of the shaft seal assembly is interference fit with the bearing hole to prevent high-temperature gas from leaking from the inner wall of the bearing hole. The graphite sealing ring 2 is tightly attached to the sealing surface of the metal outer ring 1 under the axial thrust of the corrugated gasket 7, and at the same time, it tightly holds the valve shaft under the radial thrust of the suspension spring 4, so that the high-temperature gas will not leak from the valve shaft in any state of the valve.
[0047] The utility model realizes double sealing of the inner wall of the bearing hole and the valve shaft. The utility model skillfully combines metal and graphite materials, as well as a series of carefully designed components, to ensure excellent sealing performance under high temperature and high pressure environments.
[0048] Other parts not described belong to the prior art.
Claims
1. A high-temperature combined shaft seal structure, characterized in that: The invention comprises a metal outer ring (1), a graphite sealing ring (2) and a metal flat gasket (3); the metal outer ring (1) is provided with a first annular groove (11), a second annular groove (12), a third annular groove (13), a fourth annular groove (14) and a fifth annular groove (15) in sequence from top to bottom; the graphite sealing ring (2) is located in the fourth annular groove (14); the metal flat gasket (3) is located in the fifth annular groove (15); and a suspension spring (4) is provided between the inner wall of the fourth annular groove (14) and the graphite sealing ring (2).
2. A high temperature combined shaft seal structure according to claim 1, characterized in that: A graphite retaining ring (5) is arranged between the graphite sealing ring (2) and the suspension spring (4).
3. A high temperature combined shaft seal structure according to claim 2, characterized in that: The outer ring of the graphite retaining ring (5) is provided with a groove (51), and the suspension spring (4) is located in the groove (51).
4. A high temperature combined shaft seal structure according to claim 3, characterized in that: A metal thin gasket (6) and a corrugated gasket (7) are arranged in sequence from top to bottom between the graphite sealing ring (2) and the metal flat gasket (3).
5. The high temperature combined shaft seal structure according to claim 1, characterized in that: The graphite sealing ring (2) is provided with a graphite sealing ring opening (21).
6. A high temperature combined shaft seal structure according to claim 5, characterized in that: The graphite sealing ring (2) is provided in two pieces, and the graphite sealing ring openings (21) of the two graphite sealing rings (2) are installed opposite to each other at an angle of 180 degrees.
7. A high temperature combined shaft seal structure according to claim 2, characterized in that: The graphite retaining ring (5) is provided with a graphite retaining ring opening (52).
8. The high temperature combined shaft seal structure according to claim 1, characterized in that: The outer diameter of the metal outer ring (1) and the bearing hole are fitted with interference fit.
9. A high temperature combined shaft seal structure according to claim 4, characterized in that: The bottom surface of the metal outer ring (1) is provided with a V-shaped groove (16).