Spiral wound gasket for gas turbine

Abstract

The utility model relates to a spiral-wound gasket for a gas turbine, which is characterized by comprising a gasket inner ring, a spiral-wound gasket outer ring, a spiral-wound gasket inner ring, a spiral-wound gasket inner ring and a spiral-wound gasket outer ring, the winding belt is formed by alternately winding a metal belt and a graphite belt and is wound on the outer surface of the gasket inner ring, the cross section of the metal belt and the cross section of the graphite belt are both in a V shape, and a V-shaped groove is formed in the middle of the metal belt and the middle of the graphite belt. The V-shaped section design of the metal belt and the graphite belt is favorable for providing tighter sealing, the V shape can generate higher sealing contact pressure when being pressed, so that medium leakage is effectively prevented, and the bulges of the metal belt are matched with the grooves of the graphite belt to form physical interlocking, so that the sealing performance is improved. Therefore, displacement of the strip under the dynamic condition is prevented, the stability of the whole structure is improved, and meanwhile the metal strip is prevented from falling off in the transportation or installation process.

Description

Technical Field

[0001] The utility model relates to the technical field of speed reducers, in particular to a winding gasket for a gas turbine. Background Technique

[0002] A gas turbine is a power machine widely used in the fields of power generation and aviation. It relies on high-performance and highly reliable components to ensure its performance and safe operation. Among them, sealing technology is one of the key technologies to ensure the efficient operation of gas turbines. Among the multiple components of the turbine, winding gaskets play a crucial role in ensuring the airtightness of mechanical joints and preventing the leakage of working media.

[0003] Traditional winding gaskets are mostly made of a single material, such as all-metal or all-non-metal gaskets. Although these gaskets perform well in some applications, in the high-temperature and high-pressure environment of gas turbines, they often face problems such as material failure, decreased sealing performance, and shortened service life. And usually, the metal strip is prone to falling off during transportation or use, affecting installation.

[0004] Chinese Patent No. 201820925022.2 discloses an assembled metal winding gasket, which discloses the following technical solution: including a gasket inner ring, a gasket body, and a gasket outer ring. The gasket body is clamped between the gasket inner ring and the gasket outer ring. The gasket body is tightly wound by a metal strip and a graphite strip in a spiral manner. The cross-sections of the metal strip and the graphite strip are both V-shaped. The outer side of the gasket inner ring is provided with a V-shaped protrusion that matches the inner side of the gasket body. The inner side of the gasket outer ring is provided with a V-shaped groove that matches the outer side of the gasket body. The gasket outer ring is composed of an upper ring body and a lower ring body that are screwed together. The beneficial effects of the utility model are: by adopting a gasket outer ring composed of an upper ring body and a lower ring body screwed together, on the one hand, it is convenient to install the gasket outer ring on the gasket body, and on the other hand, a V-shaped groove that matches the outer side of the gasket body can be provided on the inner side of the gasket outer ring, so that the gasket body can be fixed together with the gasket inner ring to prevent the gasket outer ring from falling off the gasket body.

[0005] Therefore, it is necessary to design a winding gasket for a gas turbine to solve the above technical problems. Content of the Utility Model

[0006] The purpose of the utility model is to provide a winding gasket for a gas turbine to solve the above problems.

[0007] In order to solve the above technical problems, the utility model provides a winding gasket for a gas turbine, including:

[0008] A gasket inner ring, on one side of which a metal filter screen is installed;

[0009] Winding tape, the winding tape is formed by alternately winding a metal tape and a graphite tape, and is wound around the outer surface of the inner ring of the gasket. The cross-sections of both the metal tape and the graphite tape are V-shaped, and a V-groove is provided at the middle of the metal tape and the graphite tape. Raised portions are provided on both sides of the outer surfaces of the metal tape and the graphite tape, and grooves are provided on the inner surfaces of the metal tape and the graphite tape;

[0010] Outer ring of the gasket, the outer ring of the gasket is sleeved outside the graphite tape, and the inner ring of the gasket is composed of a first outer ring body and a second outer ring body spliced together.

[0011] Further, a first V-surface that cooperates with the metal tape and the graphite tape, and a second V-surface that cooperates with the V-groove are provided on the outer surface of the inner ring of the gasket.

[0012] Further, the included angle of the V-groove is 65 - 75 degrees, and the included angle of the inner surfaces of the metal tape and the graphite tape is 155 - 165 degrees.

[0013] Further, the raised portions are located within the grooves. The raised portions are semi-circular arc-shaped or triangular-shaped, and the grooves are semi-circular arc-shaped or triangular-shaped corresponding to the raised portions.

[0014] Further, screw holes are provided at both ends of the first outer ring body and the second outer ring body, and V-grooves that cooperate with the outer surface of the graphite tape are provided on the inner walls of the first outer ring body and the second outer ring body.

[0015] Further, a ring groove is provided at one end of the inner ring of the gasket. A collar is provided on the outer surface of the metal filter net. Screw holes are provided on the ring groove and the collar. After the collar is installed in the ring groove, the collar is fixed in the ring groove by bolts.

[0016] Further, the metal tape is made of graphite material, and the graphite tape is made of stainless steel material.

[0017] The beneficial effects of the present utility model are as follows: The V-shaped cross-section design of the metal and graphite tapes helps to provide a tighter seal because the V-shape can generate a higher sealing contact pressure when being compressed, thereby effectively preventing the leakage of the medium. The raised portions of the metal tape cooperate with the grooves of the graphite tape to form a physical interlock, which not only helps to prevent the displacement of the tapes under dynamic conditions, but also increases the stability of the overall structure, and at the same time prevents the metal tape from falling off during transportation or installation. Description of the Drawings

[0018] Figure 1 is an exploded view of a winding gasket for a gas turbine of the present utility model;

[0019] Figure 2is a perspective view of a wound gasket for a gas turbine of the present utility model;

[0020] Figure 3 is a perspective view of the outer ring of the gasket of the present utility model;

[0021] Figure 4 is a partial perspective view of the metal strip or graphite strip of the present utility model;

[0022] Figure 5 is a side view of a wound gasket for a gas turbine of the present utility model.

[0023] In the figure:

[0024] 1. Inner gasket ring; 11. Metal filter screen; 12. Ring groove; 13. Collar; 14. First V surface; 15. Second V surface;

[0025] 2. Winding strip; 21. Metal strip; 22. Graphite strip; 23. V groove; 24. Protrusion; 25. Groove;

[0026] 3. Outer gasket ring; 31. First outer ring body; 32. Second outer ring body; 33. Screw hole. Specific embodiments

[0027] Now, the present utility model will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0028] As Figures 1 to 5 shown, the present utility model provides a wound gasket for a gas turbine, including: an inner gasket ring 1, a metal filter screen 11 is installed on one side of the inner gasket ring 1, a ring groove 12 is opened at one end of the inner gasket ring 1, a collar 13 is arranged on the outer surface of the metal filter screen 11, screw holes 33 are opened on the ring groove 12 and the collar 13, and after the collar 13 is installed in the ring groove 12, the collar 13 is fixed in the ring groove 12 by bolts.

[0029] The inner gasket ring 1 is used to fit the internal joint surface of the turbine, providing a preliminary sealing effect, and a metal filter screen 11 is installed outside the inner gasket ring 1 to intercept particles or impurities that may enter the sealing area, preventing these impurities from affecting the sealing effect or damaging mechanical components. When installing the metal filter screen 11, the collar 13 is installed in the ring groove 12, and the collar 13 is fixed in the ring groove 12 by bolts to ensure that the gasket remains fixed during the operation of the gas turbine and will not shift due to vibration or temperature changes.

[0030] The outer surface of the inner gasket ring 1 is provided with a first V surface 14 that cooperates with the metal strip 21 and the graphite strip 22, and a second V surface 15 that cooperates with the V groove 23

[0031] The first V surface 14 is used to directly butt against the V-shaped cross-section of the graphite tape 22. The shape of the first V surface 14 matches the V-shaped cross-section of the winding tape 2, which can increase the contact area, thereby improving the sealing efficiency and reliability. When the gasket is compressed, the close contact between the first V surface 14 and the winding tape 2 helps to form a uniformly distributed pressure field, which is crucial for preventing medium leakage.

[0032] The second V surface 15 cooperates with the V groove 23 between the metal tape 21 and the graphite tape 22. The shape and size of the second V surface 15 match the V groove 23, so that when the component is subjected to external forces such as thermal expansion or mechanical pressure, it can better absorb and relieve these forces, avoiding damage caused by excessive force concentration. The design of the second V surface 15 also helps to lock the position of the winding tape 2, ensuring the stability and sealing performance during long-term operation.

[0033] The winding tape 2 is formed by alternately winding the metal tape 21 and the graphite tape 22, and is wound around the outer surface of the inner ring 1 of the gasket. The cross-sections of both the metal tape 21 and the graphite tape 22 are V-shaped, and a V groove 23 is provided in the middle of the metal tape 21 and the graphite tape 22. Protrusions 24 are provided on both sides of the outer surface of the metal tape 21, and grooves 25 are provided on the inner surface of the graphite tape 22. The metal tape 21 is made of stainless steel, and the graphite tape 22 is made of graphite.

[0034] The metal tape 21 is made of stainless steel, with high strength and good mechanical properties to ensure structural stability in high-pressure and high-temperature environments. The graphite tape 22 is made of graphite. Graphite can withstand extremely high temperatures and is suitable for use in high-temperature environments. It will not easily lose its mechanical properties like some metals. The self-lubricating property of graphite can reduce the friction between moving parts, help reduce wear and extend the service life. Compared with metals, graphite is more flexible and can better absorb and disperse pressure when subjected to external forces. The V-shaped cross-section design of the metal tape 21 and the graphite tape 22 helps to provide a tighter seal because the V shape can generate a higher sealing contact pressure when compressed, effectively preventing medium leakage. The design of the protrusions 24 on the metal tape 21 cooperates with the grooves 25 on the graphite tape 22 to form a physical interlock, which not only helps to prevent the displacement of the tapes under dynamic conditions but also increases the overall structural stability and prevents the metal tape 21 from falling off during transportation or installation.

[0035] The included angle of the V groove 23 is 65 - 75 degrees, and the included angle between the inner surfaces of the metal tape 21 and the graphite tape 22 is 155 - 165 degrees.

[0036] The included angle of the V groove 23 is designed to be between 65 and 75 degrees, which helps to achieve good sealing contact. Within this angle range, the V groove 23 can effectively cooperate with the corresponding V surface to form a stable locking structure, reducing the possibility of air leakage.

[0037] The protrusion 24 is located within the groove 25. The protrusion 24 is semi-circular or triangular in shape, and the groove 25 is semi-circular or triangular in shape corresponding to the protrusion 24.

[0038] The semi-circular protrusion 24 and groove 25 can provide a smooth contact interface, reduce stress concentration that may be caused by sharp corners, and prevent detachment between the metal strip 21 and the graphite strip 22. The semi-circular design helps to disperse the loading pressure.

[0039] The triangular protrusion 24 and groove 25 can provide more contact points and enhanced insertion stability, effectively prevent sliding between the metal strip 21 and the graphite strip 22, and have good resilience.

[0040] The outer gasket ring 3 is sleeved outside the graphite strip 22. The inner gasket ring 1 is composed of a first outer ring body 31 and a second outer ring body 32 spliced together. Screw holes 33 are provided at both ends of the first outer ring body 31 and the second outer ring body 32. V-grooves 23 that match the outer surface of the graphite strip 22 are provided on the inner walls of the first outer ring body 31 and the second outer ring body 32.

[0041] The inner gasket ring 1 consists of two parts, the first outer ring body 31 and the second outer ring body 32. The segmented design allows for more flexibility during manufacturing and assembly, especially in applications with large or complex shapes. The segmented design also facilitates transportation and replacement because the individual segments are easier to handle and install. V-grooves 23 that match the outer surface of the graphite strip 22 are provided on the inner walls of the first outer ring body 31 and the second outer ring body 32. This V-groove 23 design helps to precisely control and position the graphite strip 22, ensuring that it is correctly located at the required position, increasing the sealing performance and structural stability of the entire gasket.

[0042] Based on the ideal embodiments of the present utility model as inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A wound gasket for a gas turbine, characterized in that, Comprising: A gasket inner ring (1), on one side of which a metal filter net (11) is installed; A winding belt (2), which is formed by alternately winding a metal belt (21) and a graphite belt (22), and is wound on the outer surface of the gasket inner ring (1). The cross-sections of both the metal belt (21) and the graphite belt (22) are V-shaped, and a V-groove (23) is provided at the middle of the metal belt (21) and the graphite belt (22). Protrusions (24) are provided on both sides of the outer surfaces of the metal belt (21) and the graphite belt (22), and grooves (25) are formed on the inner surfaces of the metal belt (21) and the graphite belt (22); A gasket outer ring (3), which is sleeved outside the graphite belt (22). The gasket inner ring (1) is composed of a first outer ring body (31) and a second outer ring body (32) spliced together.

2. A wound gasket for a gas turbine as claimed in claim 1, wherein The outer surface of the gasket inner ring (1) is provided with a first V-surface (14) that cooperates with the metal belt (21) and the graphite belt (22), and a second V-surface (15) that cooperates with the V-groove (23).

3. A wound gasket for a gas turbine as claimed in claim 2, wherein The included angle of the V-groove (23) is 65 - 75 degrees, and the included angle of the inner surfaces of the metal belt (21) and the graphite belt (22) is 155 - 165 degrees.

4. A wound gasket for a gas turbine as claimed in claim 3, wherein The protrusion (24) is located within the groove (25). The protrusion (24) is in a semi-circular arc shape or a triangular shape, and the groove (25) is in a semi-circular arc shape or a triangular shape corresponding to the protrusion (24).

5. A wound gasket for a gas turbine as claimed in claim 4, wherein Both ends of the first outer ring body (31) and the second outer ring body (32) are provided with screw holes (33), and the inner walls of the first outer ring body (31) and the second outer ring body (32) are provided with V-grooves (23) that cooperate with the outer surface of the graphite belt (22).

6. A wound gasket for a gas turbine as claimed in claim 5, wherein One end of the gasket inner ring (1) is provided with a ring groove (12). A collar (13) is provided on the outer surface of the metal filter net (11). Screw holes (33) are provided in the ring groove (12) and the collar (13). After the collar (13) is installed in the ring groove (12), the collar (13) is fixed in the ring groove (12) by bolts.

7. A wound gasket for a gas turbine as claimed in claim 6, wherein The metal belt (21) is made of stainless steel, and the graphite belt (22) is made of graphite.

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