Metal flexible cloth sealing structure for combustion chamber of gas turbine
By adopting a metal flexible cloth sealing structure in the gas turbine, the problem of sealing leakage of traditional seals under relative motion is solved, and higher sealing performance and system reliability are achieved.
Patent Information
- Application Number
- CN202421589459.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-05
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-07-05
AI Technical Summary
The seals in traditional gas turbines are unable to effectively adapt to the relative movement between components due to their lack of flexibility, resulting in seal leakage.
The metal flexible cloth sealing structure is adopted, including flexible metal cloth and high-temperature resistant gasket. The notch is inserted through an interference fit and connected to the supporting gasket to form a flexible sealing system.
Effectively reduce or prevent leakage flow between high-pressure and low-pressure areas on both sides of the seal, improving sealing performance and system reliability and stability.
Smart Images
Figure CN222849314U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of gas turbines, and in particular relates to a metal flexible cloth sealing structure for a combustion chamber of a gas turbine. Background Art
[0002] Between turbine components, such as between a transition section and a first stage nozzle of a combustor, a seal assembly is provided to seal between each transition section and the first stage nozzle for eliminating or minimizing leakage flow between high pressure and low pressure regions on both sides of the seal.
[0003] In a conventional gas turbine, multiple burners are arranged in a circular array around the axis of the turbine to deliver the hot gases from the burners through the transition section to the first stage nozzle. This type of combustion system requires seals to withstand relative movement with the sealed connection parts. Figure 1 As shown, the transition section has an outwardly opening slot I, which is generally arranged radially, while the first-stage nozzle generally has an axially opening slot II, which is arranged axially. A relatively strong rigid seal extends between slots I and II, which is not flexible enough to accommodate the relative movement between the components. When misalignment occurs between the sealing components, these relatively hard seals will tilt or "tilt", causing excessive leakage to flow through the seal.
[0004] The above information disclosed in the above background technology section is only used to enhance the understanding of the background technology of the technology described in this article. Therefore, the background technology may contain certain information that does not form the prior art known in this country to those skilled in the art. Utility Model Content
[0005] In order to solve the defects of the above-mentioned prior art, the utility model proposes a metal flexible cloth sealing structure for a gas turbine combustion chamber.
[0006] The technical solution adopted by the utility model is as follows:
[0007] A gas turbine combustion chamber metal flexible cloth sealing structure is installed between a combustion chamber transition section and a turbine air inlet nozzle for sealing, and comprises a metal flexible cloth sealing member and a supporting gasket. The bottom end of the metal flexible cloth sealing member is inserted into a notch I of the combustion chamber transition section in an interference fit manner, the top end of the metal flexible cloth sealing member is connected to the supporting gasket, and the other end of the supporting gasket away from the metal flexible cloth sealing member is inserted into a notch II of the turbine air inlet nozzle in an interference fit manner.
[0008] Optionally, the metal flexible cloth seal includes an inner flexible metal cloth and a high temperature resistant gasket included on the outer side of the flexible metal cloth.
[0009] Optionally, the bottom of the notch I is arc-shaped, and the lower edge of the flexible metal cloth is also arc-shaped.
[0010] Furthermore, the cross-sectional shape of the high temperature resistant gasket is a "J" shape, which wraps the outer side surface of the flexible metal cloth away from the supporting gasket and the lower edge of the flexible metal cloth.
[0011] The cross-sectional shape of the high temperature resistant gasket is a "J" shape, which wraps the outer side of the flexible metal cloth away from the support gasket and the lower edge of the flexible metal cloth. The high temperature resistant gasket is wrapped around the high pressure side of the outer side, so that the high pressure directly acts on the gasket, so that the flexible metal cloth and the sealing surface of the groove are kept in sealing engagement, thereby increasing the flow resistance in addition to the flow resistance provided by the filter cloth material. The high temperature resistant gasket is wrapped around the lower edge of the flexible metal cloth and extends toward the sealing surface, which can block the leakage flow between the high pressure and low pressure areas, thereby minimizing or preventing the leakage flow.
[0012] Furthermore, the flexible metal cloth adopts a plain, twill, Dutch twill or twisted fabric structure.
[0013] Optionally, the supporting gasket includes a connecting portion I connected to the metal flexible cloth seal, a connecting portion II connected to the notch II of the turbine intake nozzle, and a supporting portion in the middle of the connecting portion I and the connecting portion II.
[0014] Furthermore, the connection part I is in the shape of a cap, which is covered on the top of the metal flexible cloth seal; the connection part II is adapted to the shape of the slot II; and the support part is in the shape of a continuous right-angle bend.
[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:
[0016] In general, compared with the prior art, the utility model provides a gas turbine combustion chamber metal flexible cloth sealing structure, which aims to effectively eliminate or minimize the leakage flow between the high-pressure and low-pressure areas on both sides of the seal, and has significant advantages over the prior art. The sealing structure consists of a metal flexible cloth seal and a support gasket. The metal flexible cloth seal includes a flexible metal cloth and an externally wrapped high-temperature resistant gasket. The bottom end of the flexible metal cloth is inserted into the slot I in an interference fit manner, which can absorb vibration movement and effectively avoid the sealing leakage problem that may occur in traditional rigid seals under vibration. The high-temperature resistant gasket adopts a "J"-shaped cross-sectional shape, which is wrapped around the outer side and lower edge of the flexible metal cloth. By wrapping on the outer high-pressure side, the high pressure directly acts on the gasket, ensuring that the flexible metal cloth is tightly engaged with the sealing surface of the groove, increasing the flow resistance. At the same time, the high-temperature resistant gasket extends to the lower edge to the sealing surface, effectively blocking the leakage flow between the high-pressure and low-pressure areas, and minimizing or preventing leakage. It can be seen that the metal flexible cloth sealing structure in the utility model optimizes the sealing performance, improves the reliability and stability of the sealing system through the carefully designed metal flexible cloth seals and support gaskets, and provides important guarantee for the safe operation of the gas turbine combustion chamber. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The present invention will be described by way of examples with reference to the accompanying drawings, in which:
[0018] Figure 1 It is a schematic diagram of a traditional sealing method in the prior art;
[0019] Figure 2 This is a schematic diagram of a sealing structure in one embodiment of the utility model;
[0020] Figure 3 This is a schematic diagram of a flexible metal cloth in one embodiment of the utility model;
[0021] Figure 4 This is a schematic diagram of the structure of a Dutch twill fabric in one embodiment of the present invention. DETAILED DESCRIPTION
[0022] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.
[0023] This embodiment provides a gas turbine combustion chamber metal flexible cloth sealing structure, which is intended to effectively deal with the leakage flow problem between the high-pressure and low-pressure areas and ensure the efficient operation of the system. By being installed between the combustion chamber transition section 1 and the turbine intake nozzle 2, this metal flexible cloth seal 4 plays a key role in isolation and sealing, see Figure 2 , including: a metal flexible cloth seal 4 and a support gasket 5, the bottom end of the metal flexible cloth seal 4 is inserted in the notch Ⅰ6 of the combustion chamber transition section 1 in an interference fit manner, the top end of the metal flexible cloth seal 4 is connected to the support gasket 5, and the other end of the support gasket 5 away from the metal flexible cloth seal 4 is inserted in the notch Ⅱ7 of the turbine intake nozzle 2 in an interference fit manner, thereby forming a mutually coordinated sealing system to isolate the high-pressure and low-temperature environment outside the metal flexible cloth seal 4 from the low-pressure and high-temperature environment inside. The design of this structure not only enables the seal to flexibly adapt to various pressure and temperature changes during the operation of the gas turbine, but also ensures the reliability and durability of the seal. By effectively eliminating or minimizing the leakage flow, this metal flexible cloth sealing structure helps to improve the efficiency and performance of the gas turbine, thereby promoting the operation level of the entire system to a higher level.
[0024] In a preferred embodiment, see Figure 3, the design of the metal flexible cloth seal 4 further optimizes the performance and reliability of the sealing structure. The seal has a flexible metal cloth 8 on the inside and a high temperature resistant gasket 9 on the outside. The ingenious design of this structure provides multiple functions to cope with complex working environments. The flexible metal cloth 8 is usually made of composite metal woven cloth or knitted cloth. This cloth has good elasticity and high temperature resistance and can effectively adapt to the high temperature and high pressure environment during the operation of the gas turbine. The inner side of the flexible metal cloth 8 is tightly engaged with the sealing surface of the notch Ⅰ6 on the transition section to ensure the reliability and effectiveness of the seal. The high temperature resistant gasket 9 is located on the outside of the flexible metal cloth 8, providing structural support for the flexible metal cloth 8. This design not only enhances the overall stability of the seal, but also effectively prevents deformation or damage caused by high temperature and high pressure. As a sacrificial component of the sealing surface, the flexible metal cloth 8 bears wear and stress, while the presence of the high temperature resistant gasket 9 ensures that the seal can maintain stable performance under various working conditions. In summary, the preferred embodiment of the metal flexible cloth seal 4 realizes reliable sealing of the seal in a high temperature and high pressure environment by combining the design of the flexible metal cloth 8 and the high temperature resistant gasket 9, thereby providing higher efficiency and reliability guarantee for the operation of the gas turbine.
[0025] Furthermore, when selecting cloth seal design materials, oxidation resistance and wear resistance are critical key attributes. For cloth fiber materials, these performance characteristics directly affect the performance of seals in high temperature and high pressure environments. In addition, structural gaskets, as auxiliary components, also need to have high temperature strength and oxidation resistance, as well as good creep and fatigue properties to ensure the reliability and long-term operation of the overall sealing system. Typical cloth fiber materials such as Haynes25 (also known as L605) are widely used because of their excellent high temperature wear resistance. However, it should be noted that at temperatures exceeding 750°C (about 1400°F), the oxidation rate of Haynes25 may increase dramatically, thereby shortening the service life. In order to cope with higher temperature requirements, the metal flexible cloth in this embodiment preferably uses Haynes188. Haynes 188 has excellent oxidation resistance and can effectively resist oxidation at high temperatures.
[0026] Furthermore, in the design of cloth seals, it is important to select the appropriate cloth weave structure, mesh density and orientation. Metal fabric structures generally include plain, twill, Dutch twill and twisted types. The weave selection of the sealing cloth depends on key parameters such as wear, leakage performance and mesh integrity. In this embodiment, the metal flexible cloth preferably adopts a Dutch twill weave structure, which combines the characteristics of different wire diameters and forms a unique structure through staggered and alternating channel design (see Figure 4). This woven structure combines the advantages of a high-density mesh with relatively large fiber diameters for outstanding performance. Dutch twill fabrics also offer an interlocking structure that allows for greater mesh integrity when cut locally.
[0027] In another preferred embodiment, the bottom of the notch Ⅰ6 and the lower edge of the flexible metal cloth 8 are both designed in an arc shape. This design helps to reduce stress concentration and improve the durability and sealing performance of the seal. Specifically, the cross-sectional shape of the high temperature resistant gasket 9 is a "J" shape, which wraps the outer side of the flexible metal cloth 8 away from the support gasket 5 and the lower edge of the flexible metal cloth 8. In this design, the outer side of the flexible metal cloth 8 is the high pressure side, and the inner side is the sealing side, the purpose is to block the gas flow in the high pressure area from passing through the seal. The gasket is placed on the high pressure side of the flexible metal cloth 8, and the gasket is wrapped on the outer high pressure side through the "J" cross-sectional shape, directly subjected to the high pressure, ensuring that the flexible metal cloth 8 maintains a good sealing engagement with the sealing surface of the groove. The gasket is wrapped on the outer side and the lower edge of the flexible metal cloth 8 and extends to the sealing surface, effectively preventing the leakage flow between the high pressure and low pressure areas. This design not only increases the flow resistance in addition to the flow resistance provided by the filter cloth material, but also minimizes or prevents the occurrence of leakage flow, thereby improving the performance and reliability of the sealing system.
[0028] In general, the design of the high temperature resistant gasket 9 with a "J" shaped cross section, combined with the design of the notch at the bottom of the arc and the lower edge of the flexible metal cloth 8, effectively optimizes the structure of the seal, ensures reliable sealing under high temperature and high pressure environment, and provides important guarantee for the safe operation of the equipment. In another preferred embodiment, the support gasket 5 includes a connection part I501 connected to the metal flexible cloth seal 4, a connection part II502 connected to the notch II7 of the turbine intake nozzle 2, and a support part 503 in the middle of the connection part I501 and the connection part II502.
[0029] Furthermore, the connection portion I 501 is in the shape of a cap, covering the top of the metal flexible cloth seal 4. This shape design provides additional protection and support, ensuring the stability and reliability of the seal.
[0030] The shape of the connecting portion II 502 is matched with the notch II 7. This carefully designed matching shape ensures a perfect fit between the connecting portion and the notch, thereby enhancing the sealing performance and durability of the sealing system.
[0031] The support portion 503 is in the shape of a continuous right-angle bend, which provides a solid support structure and helps maintain the shape and function of the seal. The continuous right-angle bend shape of the support portion 503 can effectively disperse pressure and ensure that the seal can work effectively under various working conditions.
[0032] As described above, the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.
Claims
1. A gas turbine combustion chamber metal flexible cloth sealing structure, installed between the combustion chamber transition section and the turbine inlet nozzle, used for sealing, characterized in that: It includes a metal flexible cloth seal and a supporting gasket. The bottom end of the metal flexible cloth seal is inserted in the slot I of the transition section of the combustion chamber in an interference fit manner, the top end of the metal flexible cloth seal is connected to the supporting gasket, and the other end of the supporting gasket away from the metal flexible cloth seal is inserted in the slot II of the turbine intake nozzle in an interference fit manner.
2. A gas turbine combustion chamber metal flexible cloth sealing structure according to claim 1, characterized in that: The metal flexible cloth seal includes a flexible metal cloth on the inside and a high temperature resistant gasket on the outside of the flexible metal cloth.
3. A gas turbine combustion chamber metal flexible cloth sealing structure according to claim 1, characterized in that: The bottom of the notch I is arc-shaped, and the lower edge of the flexible metal cloth is also arc-shaped.
4. A gas turbine combustion chamber metal flexible cloth sealing structure according to claim 2, characterized in that: The cross-sectional shape of the high temperature resistant gasket is a "J" shape, which wraps the outer side of the flexible metal cloth away from the supporting gasket and the lower edge of the flexible metal cloth.
5. A gas turbine combustion chamber metal flexible cloth sealing structure according to claim 4, characterized in that: The flexible metal cloth adopts a plain, twill, Dutch twill or twisted fabric structure.
6. A gas turbine combustion chamber metal flexible cloth sealing structure according to claim 1, characterized in that: The supporting gasket comprises a connecting portion I connected to the metal flexible cloth sealing member, a connecting portion II connected to the notch II of the turbine air intake nozzle, and a supporting portion in the middle of the connecting portion I and the connecting portion II.
7. A gas turbine combustion chamber metal flexible cloth sealing structure according to claim 6, characterized in that: The connection part I is in the shape of a cap, which is covered on the top of the metal flexible cloth sealing member; the connection part II is adapted to the shape of the slot II; and the support part is in the shape of a continuous right-angle bend.