Metal sealing rope, preparation method of metal sealing rope and turbine stationary blade sealing structure

Abstract

The invention provides a metal sealing rope, a preparation method of the metal sealing rope and a turbine stationary blade sealing structure. The metal sealing rope provided by the invention is used for sealing between a turbine stationary blade and a stationary blade sealing ring; the metal sealing rope comprises an armor layer, a filling core and a fixing agent; the armor layer is formed by weaving a metal flat belt; the filling core is formed by weaving a plurality of core bodies; the armor layer is coated on the filling core; the fixing agent is dispersed in the armor layer, the contact surface of the armor layer and the filling core and in the filling core; the armor layer and the fixing agent enable the metal sealing rope to be rectangular in a normal temperature state; the fixing agent is volatilized through heat generated by working of the gas turbine, so that the metal sealing rope expands in the longitudinal direction and the transverse direction, and the metal flat belt of the armor layer is in plane contact with the turbine stationary blade and the stationary blade sealing ring. According to the metal sealing rope, the preparation method of the metal sealing rope and the turbine stationary blade sealing structure, good sealing can be formed between the turbine stationary blade and the stationary blade sealing ring.

Description

Technical Field

[0001] The present application relates to the technical field of gas turbines, and in particular to a metal sealing rope, a method for preparing the metal sealing rope, and a turbine vane sealing structure. Background Art

[0002] With the continuous development of the global economy and the continuous growth of the population, the demand for energy is increasing. As an efficient and clean energy conversion equipment, gas turbines play an increasingly important role in power generation, industrial drive, aerospace and other fields. As one of the core components of gas turbines, turbine vanes have an important impact on the operation of gas turbines.

[0003] A gas turbine is an internal combustion power machine that uses a continuously flowing gas as a working fluid to drive the impeller to rotate at high speed, converting the energy of the fuel into useful work. Turbine vanes usually work in a high-temperature environment. In order to prevent high temperature from damaging the turbine vanes and rotor components, cooling gas is usually introduced between the turbine vanes and the vane sealing ring to cool the turbine vanes. In order to prevent the loss of cooling gas, a seal needs to be designed between the lower end of the turbine vane and the vane sealing ring.

[0004] Traditional seals use baffles and springs to achieve sealing effects. They use axial screws to connect the sealing sheet, spring and gasket together. The screws are connected to the stationary blade sealing ring through threads. Along the circumferential direction, the sealing sheet is divided into many sectors, and each sector is axially positioned by a screw and a spring. In this structure, there is a gap between the sealing sheets when they are installed, the leakage is too large, and the sealing effect is poor. Summary of the invention

[0005] In view of this, the present application provides a metal sealing rope, a method for preparing the metal sealing rope, and a turbine stator blade sealing structure, so as to solve the problems of poor sealing effect and large leakage of traditional sealing structures.

[0006] Specifically, the present application is implemented through the following technical solutions: The first aspect of the present application provides a metal sealing rope, which is used for sealing between turbine vanes and vane sealing rings of gas turbines; the metal sealing rope comprises an armor layer, a filling core and a fixing agent; the armor layer is woven from metal flat belts; the filling core is woven from a plurality of core bodies; wherein, The armor layer is coated on the filling core; the fixing agent is dispersed inside the armor layer, the contact surface between the armor layer and the filling core, and inside the filling core; The armor layer and the fixing agent enable the metal sealing rope to maintain a rectangular shape at room temperature, so that the lower surface of the metal sealing rope is in contact with the stationary blade sealing ring, a gap is formed between the upper surface of the metal sealing rope and the stationary blade sealing ring, and a gap is formed between the side surface of the metal sealing rope and the turbine stationary blade and the stationary blade sealing ring; The heat generated by the operation of the gas turbine causes the fixing agent to volatilize, so that the metal sealing rope expands in the longitudinal and transverse directions, and the metal flat belt of the armor layer forms a planar contact with the turbine stator blade and the stator blade sealing ring.

[0007] The second aspect of the present application provides a method for preparing a metal sealing rope, the method being used to prepare any one of the metal sealing ropes provided in the first aspect of the present application; the method comprising: A cylindrical core is prepared, and a plurality of cores are used to weave a filling core; A metal flat belt is used to weave an armor layer covering the filling core on the filling core to form an intermediate structure; wherein the cross section of the intermediate structure is circular; Placing the intermediate structure in a rectangular mold filled with a fixing agent solution so that the fixing agent solution diffuses into the interior of the armor layer, the contact surface between the armor layer and the filling core, and the interior of the filling core; applying a force to the intermediate structure so that a cross-section of the intermediate structure matches an inner shape of the rectangular mold; The fixing agent solution is cooled to solidify the fixing agent solution, and the solidified fixing agent is dispersed inside the armor layer, the contact surface between the armor layer and the filling core, and inside the filling core to form the metal sealing rope.

[0008] The third aspect of the present application provides a turbine stator blade sealing structure, the turbine stator blade sealing structure comprising a turbine stator blade, a stator blade sealing ring and any one of the metal sealing ropes provided in the first aspect of the present application; wherein, The upper end of the stationary blade sealing ring is inserted into the lower end of the turbine stationary blade to form a cavity for accommodating cooling air together with the turbine stationary blade; A groove matching the metal sealing rope is provided on the contact surface where the upper end of the stationary blade sealing ring contacts the turbine stationary blade; The metal sealing rope is filled in the groove; wherein the lower surface of the metal sealing rope is in contact with the stationary blade sealing ring, a gap is formed between the upper surface of the metal sealing rope and the stationary blade sealing ring, and a gap is formed between the side surface of the metal sealing rope and the stationary blade and the stationary blade sealing ring; The heat generated by the operation of the gas turbine causes the fixing agent of the metal sealing rope to volatilize, so that the metal sealing rope expands in the longitudinal and transverse directions. The metal flat belt of the armor layer forms a planar contact with the turbine stator blade and the stator blade sealing ring, thereby realizing the sealing function and sealing the cooling gas in the cavity.

[0009] The metal sealing rope provided by the present application is formed by arranging an armor layer, a filling core and a fixing agent, and the armor layer is woven by a metal flat belt, the filling core is woven by a plurality of core bodies, the armor layer is coated on the filling core, and the fixing agent is dispersed in the interior of the armor layer, the contact surface between the armor layer and the filling core, and the interior of the filling core. In this way, through the synergistic effect of the armor layer and the fixing agent, the metal sealing rope can be kept in a rectangular shape at room temperature, so that the lower surface of the metal sealing rope is in contact with and fits the stator blade sealing ring, a gap is formed between the upper surface of the metal sealing rope and the stator blade sealing ring, and the side surface of the metal sealing rope is in contact with the turbine stator blade and the stator blade sealing ring. A gap is formed between the sealing rings so that the metal sealing rope can be used in the sealing of the turbine stator blade and the stator blade sealing ring. Furthermore, when the gas turbine is working, the metal sealing rope can effectively adapt to the heat generated by the gas turbine. The fixing agent can volatilize under the action of the heat generated by the gas turbine. When the fixing agent volatilizes, the metal sealing rope can expand in the longitudinal and transverse directions through the synergistic effect of the fixing agent, the armor layer and the filling core. The expansion ability can be used to make the metal flat belt of the armor layer form a planar contact with the turbine stator blade and the stator blade sealing ring, so as to effectively fill the gap between the turbine stator blade and the stator blade sealing ring, improve the sealing performance and prevent gas leakage.

[0010] In addition, the metal sealing rope is first fixed with a fixing agent before use. Furthermore, when in use, it can be placed in the groove on the stationary blade sealing ring, which is very convenient to install.

[0011] Furthermore, the metal sealing rope provided in the present application can maintain a specified elasticity through the mutual constraints of multiple cores in the filling core formed by multiple cores and the constraints of the armor layer formed by metal flat strips. This elasticity not only makes the contact surface of the metal sealing rope on the contact surface larger than the width of at least one metal flat strip, so that the sealing rope can maintain stable sealing performance under various working conditions, reduce the risk of gas leakage, and enhance the overall sealing effect; it can also effectively control the expansion range of the metal sealing rope to prevent it from exceeding a predetermined range. This controllable expansion characteristic helps to prevent the metal sealing rope from causing the stator blade sealing ring to move up and down due to excessive expansion, thereby reducing the sealing failure problem caused by the up and down movement of the stator blade sealing ring, and can improve the overall performance and reliability of the seal.

[0012] The preparation method of the metal sealing rope provided in the present application provides a method for preparing the metal sealing rope. Through this method, the metal sealing rope can be prepared, and then the metal sealing rope can be used in the sealing of turbine stator blades and stator blade sealing rings to improve the sealing performance.

[0013] The turbine stator blade sealing structure provided in the present application is implemented by filling the metal sealing rope into the groove arranged on the contact surface between the upper end of the stator blade sealing ring and the turbine stator blade. In this way, when the gas turbine is working, the heat generated can volatilize the fixing agent of the metal sealing rope, so that the metal sealing rope can expand in the longitudinal and transverse directions. The metal flat belt of the armor layer forms a planar contact with the stator blade and the stator blade sealing ring, thereby realizing the sealing function and effectively preventing the leakage of cooling gas.

[0014] Furthermore, when the gas turbine is working, there is radial relative movement between the lower end of the turbine stator blade and the stator blade sealing ring. Since the metal sealing rope has a certain elasticity, it can adapt to this relative movement and still maintain good sealing performance when the turbine stator blade moves, thereby ensuring the reliability of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A diagram showing the connection structure of a turbine stator blade, a stator blade sealing ring and a rotor assembly according to an exemplary embodiment of the present application; Figure 2 A schematic diagram of a first embodiment of a metal sealing rope provided in the present application; Figure 3 This is a schematic diagram of a turbine vane sealing structure according to an exemplary embodiment of the present application; Figure 4 This is a diagram showing the original state of a metal sealing rope in a turbine vane sealing structure according to an exemplary embodiment of the present application; Figure 5 This is a working state diagram of a metal sealing rope in a turbine vane sealing structure according to an exemplary embodiment of the present application; Figure 6 A flow chart of Example 1 of the method for preparing a metal sealing rope provided in the present application; Figure 7 This is a schematic diagram of an intermediate structure shown in an exemplary embodiment of the present application.

[0016] Description of reference numerals: 1: Armor layer; 2: Filling core; 100: Transparent Quiet Leaves; 200: stationary blade sealing ring; 300: rotor assembly; 400: Metal sealing rope. DETAILED DESCRIPTION

[0017] Here, exemplary embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application.

[0018] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0019] It should be understood that although the terms first, second, third, etc. may be used in the present application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0020] Figure 1 This is a diagram showing the connection structure of a turbine stator blade, a stator blade sealing ring and a rotor assembly according to an exemplary embodiment of the present application. Figure 1 The operating temperature of the turbine vane 100 of the gas turbine is less than or equal to 600°C, and the operating pressure difference is less than or equal to 1.0MPa. During operation, in order to prevent high temperature from damaging the turbine vane 100 and the rotor assembly 300, cooling gas is introduced between the turbine vane 100 and the vane sealing ring 200. Furthermore, in order to prevent the cooling gas from flowing into other systems, a seal needs to be designed between the lower end of the turbine vane 100 and the vane sealing ring 200 to reduce the loss of cooling gas.

[0021] Furthermore, the technical parameters of the seal must meet the following requirements: 1) Achieve a certain sealing effect; at 450℃, under the condition of pressure difference of 0.5MPa, the leakage rate is ≤0.3kg / s; 2) Easy installation: The metal sealing rope 400 provided in the present application is rectangular in its original state. During operation, the fixing agent evaporates after being heated, and the metal sealing rope 400 expands by itself to achieve a sealing effect, which is very easy to install; 3) No foreign matter is allowed.

[0022] The metal sealing rope provided in the present application can achieve an air leakage of ≤0.3kg / s at the sealing connection part (under high temperature of 450°C and pressure difference of 0.5MPa). In addition, the product is very easy to install. At the same time, when the output is used to seal the turbine stator blades and stator blade sealing rings, the wear of the stator blade sealing rings can be avoided, thereby increasing the overall service life of the equipment.

[0023] Specific embodiments are given below to introduce the technical solution of the present application in detail.

[0024] Figure 2 This is a schematic diagram of Example 1 of the metal sealing rope provided in this application. Figure 3 A schematic diagram of a turbine vane sealing structure showing an exemplary embodiment of the present application. Figure 4 This is a diagram showing the original state of the metal sealing rope in the turbine vane sealing structure according to an exemplary embodiment of the present application. Figures 2 to 4 The metal sealing rope provided in this embodiment is used for sealing between the turbine stator blade 100 and the stator blade sealing ring 200 of a gas turbine; the metal sealing rope 400 comprises an armor layer 1, a filling core 2 and a fixing agent (not shown in the figure); the armor layer 1 is woven with a metal flat belt; the filling core 2 is woven with a plurality of core bodies; wherein, The armor layer 1 is coated on the filling core 2; the fixing agent is dispersed inside the armor layer 1, the contact surface between the armor layer 1 and the filling core 2, and inside the filling core 2; The armor layer 1 and the fixing agent enable the metal sealing rope 400 to maintain a rectangular shape at room temperature, so that the lower surface of the metal sealing rope 400 is in contact with the stationary blade sealing ring 200, a gap is formed between the upper surface of the metal sealing rope 400 and the stationary blade sealing ring 200, and a gap is formed between the side surface of the metal sealing rope 400 and the turbine stationary blade 100 and the stationary blade sealing ring 200; The heat generated by the operation of the gas turbine causes the fixing agent to volatilize, so that the metal sealing rope 400 expands in the longitudinal and transverse directions, and the metal flat belt of the armor layer 1 forms a planar contact with the turbine stator blade 100 and the stator blade sealing ring 200.

[0025] For details, please refer to Figure 2 The metal sealing rope 400 maintains a rectangular shape at room temperature, and the metal sealing rope 400 includes an armor layer 1 and a filling core 2. The armor layer 1 is located at the outermost layer of the metal sealing rope 400, and is coated on the filling core 2 to provide mechanical protection and structural support for the metal sealing rope 400.

[0026] It should be noted that the armor layer 1 is woven by metal flat belts. Among them, the weaving of metal flat belts refers to the metal flat belts being interlaced with each other according to a certain weaving pattern to form a tight and regular armor layer 1. Specifically, the armor layer 1 is woven by metal flat belts, and its surface is smooth and flat, which can avoid the problem of gaps between wires when metal wires are used for weaving. In addition, the use of metal flat belts to weave the armor layer 1 can not only make the armor layer 1 have higher strength and flexibility, but also increase the bonding force between the armor layer 1 and the filling core 2, and improve the overall stability of the metal sealing rope 400.

[0027] In the present application, the specific weaving form of the metal flat belt to form the armor layer is not limited. For example, in one embodiment, the armor layer 1 can be woven in a plain weave, a twill weave, a biaxial weave, a triaxial weave, or the like.

[0028] Optionally, in a possible implementation, the width of the metal flat strip is 0.2 mm to 0.3 mm. In addition, in a possible implementation, the thickness of the metal flat strip is 0.5 mm.

[0029] It should be noted that the armor layer 1 can be woven from high-temperature alloy materials through special processes according to different use temperatures. In this embodiment, the specific materials used are not limited. For example, in a possible implementation, the armor layer 1 is woven from flat belts made of cobalt-based materials or nickel-based materials.

[0030] Further, the metal sealing rope 400 is woven from a plurality of metal flat belts, and the specific number of strands is set according to actual needs, and is not limited in this embodiment. Optionally, in a possible implementation, the armor layer 1 can be woven from 12 or 24 metal flat belts.

[0031] For details, please continue to refer to Figure 2 The filling core 2 is located inside the armor layer 1 and is covered by the armor layer 1. The filling core 2 is composed of multiple core bodies and is used to provide the elasticity and deformation ability required for sealing. It works together with the armor layer 1 and the fixing agent to achieve the sealing function.

[0032] It should be noted that the multiple cores can be woven together in a spiral or staggered arrangement to form the filling core 2. In specific implementation, the multiple cores can be woven together in different weaving methods to form the filling core 2. In this embodiment, the specific weaving method is not limited. For example, in a possible implementation, the multiple cores can be woven together by twisted weaving, braided weaving, layered arrangement, twisted weaving, etc. to form the filling core 2.

[0033] In specific implementation, different filling materials can be selected to make the core body according to different use temperatures and sealing requirements. In this embodiment, there is no restriction on the material for making the core body. For example, in one embodiment, graphite can be used to make the core body; for another example, in another embodiment, ceramic fiber can be used to make the core body.

[0034] It should be noted that the number of cores is also set according to actual needs, and is not limited in this embodiment. In addition, the multiple cores can be cores made of the same material or cores made of different materials, and are not limited in this embodiment.

[0035] Specifically, the fixing agent (not shown in the figure) is dispersed inside the armor layer 1 (the fixing agent is dispersed between each metal flat strip), the contact surface between the armor layer 1 and the filling core 2, and inside the filling core 2 (the fixing agent is dispersed between each core body).

[0036] It should be noted that the fixing agent is in solid state at room temperature, in liquid state when the temperature is greater than a first temperature, and volatilizes when the temperature is greater than a second temperature. The first temperature is lower than the operating temperature of the gas turbine, and the second temperature is within the operating temperature range of the gas turbine.

[0037] Further, it can be understood that in order to ensure that the armor layer 1 and the filling core 2 are not affected by temperature when the fixing agent volatilizes, the second temperature is lower than the melting temperature of the armor layer 1 and the filling core 2 .

[0038] Please refer to Figure 3 When the metal sealing rope 400 provided in this embodiment is applied to a gas turbine, the turbine vane 100, the vane sealing ring 200 and the metal sealing rope 400 constitute a turbine vane sealing structure, wherein the upper end of the vane sealing ring 200 is inserted into the lower end of the turbine vane 100 to form a cavity for accommodating cooling air together with the turbine vane 100; A groove matching the metal sealing rope 400 is provided on the contact surface where the upper end of the stationary blade sealing ring 200 contacts the turbine stationary blade 100; The metal sealing rope 400 is filled in the groove; wherein, the lower surface of the metal sealing rope 400 is in contact with the stator blade sealing ring 200, a gap is formed between the upper surface of the metal sealing rope 400 and the stator blade sealing ring 200, and a gap is formed between the side surface of the metal sealing rope 400 and the turbine stator blade 100 and the stator blade sealing ring 200.

[0039] It should be noted that a large amount of heat is generated in the turbine area of ​​the gas turbine during operation, and this heat causes the fixing agent inside the metal sealing rope 400 to volatilize. Furthermore, since the fixing agent is dispersed inside the armor layer 1, the contact surface between the armor layer 1 and the filling core 2, and inside the filling core 2, when the fixing agent volatilizes, it will cause the metal sealing rope 400 to expand in the longitudinal and transverse directions. Furthermore, after the metal sealing rope 400 expands, the metal flat belt of the armor layer 1 forms a planar contact with the turbine stator blade 100 and the stator blade sealing ring 200 (the contact surface is a plane).

[0040] Figure 5 This is a working state diagram of the metal sealing rope in the turbine vane sealing structure shown in an exemplary embodiment of the present application. Figure 5 After the fixing agent evaporates, the metal sealing rope 400 forms a planar contact with the turbine stator blade 100 and the stator blade sealing ring 200 .

[0041] That is, the metal sealing rope 400 forms a plane with the turbine stator blade 100, and the metal sealing rope 400 forms a plane contact with the stator blade sealing ring 200. Figure 5 After the metal sealing rope 400 is placed in the groove, during operation, the metal sealing rope 400 expands by itself and contacts all surfaces of the groove.

[0042] It should be noted that the metal sealing rope 400 is rectangular, and the top and bottom of the metal sealing rope 400 may be covered with the armor layer 1, or the armor layer 1 may be covered on the side, and the top and bottom are sealed by other materials (for example, by silver sealing). Figure 3 , top and bottom along Figure 3 Up and down directions shown.

[0043] The metal sealing rope provided in this embodiment is formed by arranging an armor layer, a filling core and a fixing agent, and the armor layer is woven by a metal flat belt, the filling core is woven by a plurality of core bodies, the armor layer is coated on the filling core, and the fixing agent is dispersed in the interior of the armor layer, the contact surface between the armor layer and the filling core, and the interior of the filling core. In this way, through the synergistic effect of the armor layer and the fixing agent, the metal sealing rope can be kept rectangular at room temperature, so that the lower surface of the metal sealing rope is in contact with the stationary blade sealing ring, a gap is formed between the upper surface of the metal sealing rope and the stationary blade sealing ring, and the side surface of the metal sealing rope is in contact with the turbine stationary blade and the stationary blade sealing ring. A gap is formed between the sealing rings so that the metal sealing rope can be used in the sealing of the turbine stator blade and the stator blade sealing ring. Furthermore, when the gas turbine is working, the metal sealing rope can effectively adapt to the heat generated by the gas turbine. The fixing agent can volatilize under the action of the heat generated by the gas turbine. When the fixing agent volatilizes, the metal sealing rope can expand in the longitudinal and transverse directions through the synergistic effect of the fixing agent, the armor layer and the filling core. The expansion ability can be used to make the metal flat belt of the armor layer form a planar contact with the turbine stator blade and the stator blade sealing ring, so as to effectively fill the gap between the turbine stator blade and the stator blade sealing ring, improve the sealing performance and prevent gas leakage.

[0044] In addition, the metal sealing rope is first fixed with a fixing agent before use. Furthermore, when in use, it can be placed in the groove on the stationary blade sealing ring, which is very convenient to install.

[0045] Optional, see Figure 5 The heat generated by the operation of the gas turbine causes the metal sealing rope 400 to maintain an elliptical shape after expansion, and the metal sealing rope 400 that maintains an elliptical shape maintains surface contact and elastic fit with the stationary blade and the stationary blade sealing ring 200.

[0046] Optionally, maintaining surface contact and elastic fit includes: The metal sealing rope 400 maintaining an elliptical shape maintains specified elasticity under the mutual constraints between the individual cores in the filling core 2 formed by the plurality of core bodies and the constraints of the armor layer 1 formed by the metal flat belt; wherein the specified elasticity makes the contact surface between the metal sealing rope 400 maintaining an elliptical shape and the turbine stator blade 100 and the stator blade sealing ring 200 on any contact plane greater than the width of at least one metal flat belt, and does not cause the stator blade sealing ring 200 to move around the metal sealing rope 400 maintaining an elliptical shape.

[0047] Specifically, the metal sealing rope 400 is composed of an armor layer 1, a filling core 2 and a fixing agent. The armor layer 1 and the filling core 2 both contain the fixing agent, and the fixing agent also exists on the contact surface between the armor layer 1 and the filling core 2. The metal sealing rope 400 is made into a rectangle at room temperature. After the gas turbine starts working, the heat generated by the operation of the gas turbine causes the fixing agent to volatilize, and the metal sealing rope 400 expands in the longitudinal and transverse directions to form and maintain an elliptical shape.

[0048] It is understandable that the ellipse can provide a larger contact area. Due to the ellipse shape, when the metal sealing rope 400 contacts the turbine stator blade 100 and the stator blade sealing ring 200 on any contact plane, the contact surface is greater than the width of at least one metal flat strip.

[0049] Furthermore, the elliptical metal sealing rope 400 has a certain elastic deformation ability in different directions, which can better adapt to the shape of the sealing surface, prevent the elasticity from exceeding the design range, and effectively reduce the up and down movement of the stationary blade sealing ring 200 caused by thermal deformation, so as to avoid wear and sealing failure caused by the up and down movement.

[0050] For details, please refer to Figure 5 , keeping the elliptical metal sealing rope 400 in contact with the retaining surface of the turbine stator 100 and the stator sealing ring 200 and elastically fitting. The elastic fitting can not only enable the metal sealing rope 400 to adapt to slight deformation and vibration, maintain the stability of the seal, and improve the sealing effect, but also avoid the elasticity exceeding the design range, thereby avoiding the stator sealing ring 200 from moving up and down due to the elasticity exceeding the design range, thereby avoiding the problem of sealing failure due to up and down movement.

[0051] The metal sealing rope provided in the present embodiment can maintain a specified elasticity through the mutual constraints of the multiple cores in the filling core formed by multiple cores and the constraints of the armor layer formed by the metal flat strips. This elasticity not only makes the contact surface of the metal sealing rope on the contact surface larger than the width of at least one metal flat strip, so that the sealing rope can maintain stable sealing performance under various working conditions and enhance the overall sealing effect; it can also effectively control the expansion range of the metal sealing rope to prevent it from exceeding the predetermined range. This controllable expansion characteristic helps to prevent the metal sealing rope from causing the stator blade sealing ring to move up and down due to excessive expansion, thereby reducing the sealing failure problem caused by the up and down movement of the stator blade sealing ring, and can improve the overall performance and reliability of the seal.

[0052] Corresponding to the aforementioned embodiment of a metal sealing rope, the present application also provides an embodiment of a method for preparing a metal sealing rope.

[0053] Figure 6This is a flow chart of Example 1 of the method for preparing the metal sealing rope provided in this application. Figure 6 The method provided in this embodiment is used to prepare any metal sealing rope provided in the first aspect of the present application, and the preparation method comprises: S101, preparing a cylindrical core body, and using multiple core bodies to weave a filling core.

[0054] Specifically, a high temperature resistant material is selected to prepare a plurality of cylindrical cores, and the plurality of cores are used to braid the cores to form a filling core. It should be noted that the material for preparing the cores, the number of cores, and the braiding form of the cores are set according to actual needs, and are not limited in this embodiment. For example, in one embodiment, six cylindrical cores are made of ceramic fibers, and the six cylindrical cores are braided together in a twisted braiding manner to form a filling core.

[0055] S102, using a metal flat belt to weave an armor layer covering the filling core on the filling core to form an intermediate structure; wherein the cross-section of the intermediate structure is circular.

[0056] Specifically, Figure 7 This is a schematic diagram of an intermediate structure shown in an exemplary embodiment of the present application, please refer to Figure 7 The armor layer is formed by weaving a metal flat belt outside the filling core. The armor layer completely covers the filling core to form an intermediate structure with a circular cross-section.

[0057] Referring to the above description, the material of the metal flat belt, the size of the metal flat belt, the weaving method of the metal flat belt, etc. are set according to actual needs and are not limited in this embodiment.

[0058] S103, placing the intermediate structure in a rectangular model filled with a fixing agent solution, so that the fixing agent solution diffuses into the interior of the armor layer, the contact surface between the armor layer and the filling core, and the interior of the filling core.

[0059] Specifically, the intermediate structure is placed in a pre-prepared rectangular mold filled with a fixing solution, and is placed in the rectangular mold for a specified time so that the fixing solution diffuses into the armor layer, the contact surface between the armor layer and the filling core, and the filling core. It should be noted that the specified time is set according to actual needs and is not limited in this embodiment.

[0060] S104: Apply force to the intermediate structure to make the cross section of the intermediate structure match the internal shape of the rectangular model.

[0061] Specifically, after confirming that the fixing agent solution has diffused into the interior of the armor layer, the contact surface between the armor layer and the filling core, and the interior of the filling core, pressure is applied to the intermediate structure so that the cross-section of the intermediate structure matches the internal shape of the rectangular model, that is, by applying pressure to the intermediate structure, the intermediate structure is squeezed into a rectangle to match the shape of the rectangular mold.

[0062] S105, cooling the fixing agent solution to solidify the fixing agent solution, and dispersing the solidified fixing agent inside the armor layer, the contact surface between the armor layer and the filling core, and inside the filling core to form the metal sealing rope.

[0063] Specifically, the fixing agent solution is cooled to solidify, and the solidified fixing agent is distributed inside the armor layer, the contact surface between the armor layer and the filling core, and inside the filling core to form a rectangular metal sealing rope.

[0064] The method provided in this embodiment provides a method for preparing a metal sealing rope. Through this method, a metal sealing rope can be prepared, and then the metal sealing rope can be used in the sealing of turbine stator blades and stator blade sealing rings to improve the sealing performance.

[0065] Please continue to refer to Figure 3 The present application also provides a turbine stator blade sealing structure, the turbine stator blade sealing structure comprises a turbine stator blade, a stator blade sealing ring and the metal sealing rope; wherein, The upper end of the stationary blade sealing ring is inserted into the lower end of the turbine stationary blade to form a cavity for accommodating cooling air together with the turbine stationary blade; A groove matching the metal sealing rope is provided on the contact surface where the upper end of the stationary blade sealing ring contacts the turbine stationary blade; The metal sealing rope is filled in the groove; wherein the lower surface of the metal sealing rope is in contact with the stationary blade sealing ring, a gap is formed between the upper surface of the metal sealing rope and the stationary blade sealing ring, and a gap is formed between the side surface of the metal sealing rope and the stationary blade and the stationary blade sealing ring; The heat generated by the operation of the gas turbine causes the fixing agent of the metal sealing rope to volatilize, so that the metal sealing rope expands in the longitudinal and transverse directions. The metal flat belt of the armor layer forms a planar contact with the turbine stator blade and the stator blade sealing ring, thereby realizing the sealing function and sealing the cooling gas in the cavity.

[0066] Optionally, the size of the groove and the cross-sectional size of the metal sealing rope meet specified requirements, so that the metal sealing rope forms surface contact with each surface of the groove after expansion.

[0067] Specifically, referring to the previous description, when the gas turbine is working, the turbine vanes and the vane sealing rings are in a high-temperature environment. In order to ensure the safety and reliability of the structure of this part, it is necessary to introduce cooling gas into the cavity between the turbine vanes and the turbine sealing rings to ensure the working temperature of the turbine vanes and the vane sealing rings. At the same time, when the turbine vanes are heated, radial displacement occurs, and there is radial relative movement between the lower end of the turbine vanes and the vane sealing rings. The cooling gas flows into the vane sealing rings through the turbine vanes, thereby cooling the turbine vanes and the vane sealing rings. In order to prevent the cooling gas from flowing into other systems, a groove is opened at each of the two axial ends of the vane sealing ring, and a metal sealing rope is filled in the groove for sealing.

[0068] For further information, please refer to Figure 2 and Figure 3 The fixing agent of the metal sealing rope volatilizes when the turbine blade of the gas turbine is heated, and the metal sealing rope expands while the fixing agent volatilizes to contact with each surface of the groove, so as to achieve a sealing function through expansion and seal the cooling gas in the cavity. It should be noted that the size of the groove matches the expanded metal sealing rope, so that the expanded metal sealing rope can contact with each surface of the groove, thereby providing a good sealing effect.

[0069] The turbine stator blade sealing structure provided in the present embodiment is achieved by filling the metal sealing rope into the groove provided on the contact surface between the upper end of the stator blade sealing ring and the turbine stator blade. In this way, when the gas turbine is working, the heat generated can volatilize the fixing agent of the metal sealing rope, so that the metal sealing rope can expand in the longitudinal and transverse directions. The metal flat belt of the armor layer forms a planar contact with the stator blade and the stator blade sealing ring, thereby realizing the sealing function and effectively preventing the leakage of cooling gas.

[0070] Furthermore, when the gas turbine is working, there is radial relative movement between the lower end of the turbine stator blade and the stator blade sealing ring. Since the metal sealing rope has a certain elasticity, it can adapt to this relative movement and still maintain good sealing performance when the turbine stator blade moves, thereby ensuring the reliability of the seal.

[0071] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A metal sealing rope, characterized in that: The metal sealing rope is used for sealing between turbine vanes and vane sealing rings of gas turbines; the metal sealing rope comprises an armor layer, a filling core and a fixing agent; the armor layer is woven from metal flat belts; the filling core is woven from a plurality of core bodies; wherein, The armor layer is coated on the filling core; the fixing agent is dispersed inside the armor layer, the contact surface between the armor layer and the filling core, and inside the filling core; The armor layer and the fixing agent enable the metal sealing rope to maintain a rectangular shape at room temperature, so that the lower surface of the metal sealing rope is in contact with the stationary blade sealing ring, a gap is formed between the upper surface of the metal sealing rope and the stationary blade sealing ring, and a gap is formed between the side surface of the metal sealing rope and the turbine stationary blade and the stationary blade sealing ring; The heat generated by the operation of the gas turbine causes the fixing agent to volatilize, so that the metal sealing rope expands in the longitudinal and transverse directions, and the metal flat belt of the armor layer forms a planar contact with the turbine stator blade and the stator blade sealing ring.

2. The metal sealing rope according to claim 1, characterized in that: The heat generated by the operation of the gas turbine causes the metal sealing rope to expand and maintain an elliptical shape, and the metal sealing rope that maintains an elliptical shape maintains surface contact and elastic fit with the turbine stator blade and the stator blade sealing ring.

3. The metal sealing rope according to claim 1, characterized in that: The method of maintaining surface contact and elastic fit includes: The metal sealing rope maintaining an elliptical shape maintains specified elasticity under the mutual constraints between the individual cores in the filling core formed by the multiple core bodies and the constraints of the armor layer formed by the metal flat belts; wherein, the specified elasticity makes the contact surface between the metal sealing rope maintaining an elliptical shape and the turbine stator blade and the stator blade sealing ring on any contact plane greater than the width of at least one metal flat belt, and does not cause the stator blade sealing ring surrounding the metal sealing rope maintaining an elliptical shape to move.

4. The metal sealing rope according to claim 1, characterized in that: The width of the metal flat strip is 0.2 mm to 0.3 mm.

5. The metal sealing rope according to claim 1, characterized in that: The armor layer is woven from flat belts made of cobalt-based materials or nickel-based materials.

6. The metal sealing rope according to claim 1, characterized in that: The core is made of any of the following materials: graphite or ceramic fiber.

7. The metal sealing rope according to claim 3, characterized in that: The armor layer is woven from 12 or 24 metal flat tapes.

8. A method for preparing a metal sealing rope, characterized in that: The preparation method is used to prepare the metal sealing rope according to any one of claims 1 to 7; the preparation method comprises: A cylindrical core is prepared, and a plurality of cores are used to weave a filling core; A metal flat belt is used to weave an armor layer covering the filling core on the filling core to form an intermediate structure; wherein the cross section of the intermediate structure is circular; Placing the intermediate structure in a rectangular mold filled with a fixing agent solution so that the fixing agent solution diffuses into the interior of the armor layer, the contact surface between the armor layer and the filling core, and the interior of the filling core; applying a force to the intermediate structure so that a cross-section of the intermediate structure matches an inner shape of the rectangular mold; The fixing agent solution is cooled to solidify the fixing agent solution, and the solidified fixing agent is dispersed inside the armor layer, the contact surface between the armor layer and the filling core, and inside the filling core to form the metal sealing rope.

9. A turbine vane sealing structure, characterized in that: The turbine vane sealing structure comprises a turbine vane, a vane sealing ring and a metal sealing rope as claimed in any one of claims 1 to 7; wherein: The upper end of the stationary blade sealing ring is inserted into the lower end of the turbine stationary blade to form a cavity for accommodating cooling air together with the turbine stationary blade; A groove matching the metal sealing rope is provided on the contact surface where the upper end of the stationary blade sealing ring contacts the turbine stationary blade; The metal sealing rope is filled in the groove; wherein the lower surface of the metal sealing rope is in contact with the stationary blade sealing ring, a gap is formed between the upper surface of the metal sealing rope and the stationary blade sealing ring, and a gap is formed between the side surface of the metal sealing rope and the stationary blade and the stationary blade sealing ring; The heat generated by the operation of the gas turbine causes the fixing agent of the metal sealing rope to volatilize, so that the metal sealing rope expands in the longitudinal and transverse directions. The metal flat belt of the armor layer forms a planar contact with the turbine stator blade and the stator blade sealing ring, thereby realizing the sealing function and sealing the cooling gas in the cavity.

10. The turbine vane sealing structure according to claim 9, characterized in that: The size of the groove and the cross-sectional size of the metal sealing rope meet specified requirements, so that the metal sealing rope forms surface contact with each surface of the groove after expansion.

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