Fixing device for heat insulation module of combustion chamber of gas turbine

Abstract

The invention relates to a fixing device for a heat insulation module of a combustion chamber of a gas turbine, and aims to solve the problems of hook deformation and tile loosening under a high-temperature operation working condition. The hook comprises a fixing section, a clamping section, a tail end hook, a limiting section, a spring piece, a limiting block and the like, a multi-section integrally-formed structure is adopted, and a cooling hole, a flow guide groove and a heat buffering connecting area are arranged at key positions. A cooling cavity is formed by the tail end hook and a side groove of the heat insulation tile, effective circulation of cold air is ensured, and thermal ablation is restrained. The limiting section is connected with the tail end hook and the fixing section and used for limiting thermal deformation of the tail end hook under high-temperature scouring, and the structural stability is improved. The spring pieces have the elastic pre-tightening function, vibration and thermal shock influences are relieved, meanwhile, the micro deformation grooves are arranged in a matched mode to absorb thermal expansion differences, and the service life is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of heat insulation of a combustion chamber of a gas turbine, and in particular relates to a fixing device for a heat insulation module of a combustion chamber of a gas turbine. Background Art

[0002] The combustion chamber is an important part of the gas turbine. Its function is to provide fuel through a specific nozzle, mix the fuel with the air compressed by the compressor and burn it, so as to provide gas to the turbine section. Therefore, the combustion chamber is one of the components with the highest temperature during the operation of the gas turbine, and the internal temperature can reach 1400℃. In order to protect the metal shell of the combustion chamber, the annular combustion chamber of the F-class heavy-duty gas turbine is usually covered with metal tiles or heat-insulating tiles on the shell, and the tiles are fixed by fixing devices.

[0003] At present, there are two main types of fixing devices for the inner and outer ring tiles of the combustion chamber. One is the central fixing method applicable to metal tiles, that is, leaving a hole in the center of the tile and fastening it with bolts and related fixing structures; the other is the double-sided fixing method applicable to thermal insulation tiles, that is, fastening it with hooks and related fixing structures at the hook grooves on both sides of the tile. As a high-temperature protection component, the tile not only needs to withstand long-term high-temperature corrosion during actual service, but also needs to withstand huge thermal stress and the erosion of high-temperature gas.

[0004] For the insulation tiles fixed on both sides, the gap between two adjacent insulation tiles is subjected to long-term erosion by high-temperature gas, which will cause wear on the corners of the tiles, thus gradually increasing the gap. As the gap between the insulation tiles increases, the hook clamping section and the hook-shaped end of the clamping section, which are made of a certain nickel-based high-temperature alloy, are gradually exposed to the erosion of high-temperature gas, facing the harsh service environment of mechanical stress, high-temperature thermal stress and high-temperature gas. In addition, due to insufficient cold air, the hook clamping section is prone to ablation, and the hook-shaped end of the clamping section is also prone to thermal deformation and upward warping, thereby reducing the pre-tightening force of the clamping section on the tile, resulting in failure of the hook fixation. The failure of the hook fixation may cause the insulation tile to fall off, causing huge safety hazards. Therefore, how to effectively suppress the deformation caused by thermal stress, especially under extreme conditions, to maintain the durability and stability of the hook, needs to be solved urgently. Summary of the invention

[0005] The object of the present invention is to provide a gas turbine combustion chamber heat insulation module fixing device, comprising a hook, the hook is used to fix the heat insulation tile on the combustion chamber shell, the hook comprises a fixing section, a clamping section, a limiting section, and a spring sheet;

[0006] The fixing section is used to connect the combustion chamber shell; the fixing section is connected to the clamping section;

[0007] The clamping section is used to fix the heat insulation tile; the clamping section includes Bend I, the end hook, and Bend II. The side closer to the fixed section is Bend I, and the side farther from the fixed section is Bend II. The end hook is arranged at the end of the clamping section away from the fixed section, and the end hook is used to fix the heat insulation tile and guide the cold air flow;

[0008] One end of the limiting section is connected to the end hook, and the other end of the limiting section is connected to a position on the clamping section other than the end hook, or the fixed section, or the end of the spring piece. The limiting section is used to limit the thermal deformation of the end hook; the connection between the limiting section and the end hook, the position on the clamping section other than the end hook, and the fixed section can be achieved by welding, while the limiting section and the spring piece can be of an integral structure or welded;

[0009] The connection between the limiting section and the position on the clamping section other than the end hook forms a stable triangular structure between the limiting section and the clamping section;

[0010] The spring piece is arranged on the side of the fixed section close to the heat insulation tile, and the spring piece is used to fix the heat insulation tile and buffer and damp vibration;

[0011] An air inlet hole is arranged in the middle of Bend I, and the air inlet hole is used for the cold air to flow through;

[0012] The technical solution of this application has the following technical characteristics: to solve the problems that the heat insulation tiles in the gas turbine combustion chamber are prone to fall off, the hooks are thermally deformed, and the fixation fails under the condition of high-temperature gas scouring, an integrated hook structure composed of a fixed section, a clamping section, a limiting section, and a spring piece is adopted. The clamping section is provided with two bending structures and an end hook. The end hook has both cooling guidance and fixation functions at the same time, and an air inlet hole is arranged at Bend I to guide the cold air flow. The limiting section provides a pulling force to limit the thermal deformation of the end hook, and the spring piece is used to provide a pre-tightening force and buffer and damp vibration;

[0013] A cooling channel is formed through the air inlet hole and the guidance of the end hook to ensure that the cold air flows through the heated part of the hook, effectively reducing the temperature and delaying ablation;

[0014] The spring piece is arranged on the side of the hook close to the heat insulation tile, and through the elastic action, continuous clamping and vibration buffering are realized to prevent the tile from loosening;

[0015] Through the double-bending design of the clamping section and the cooperation of the end hook to form a structural limit, the warping and deformation of the hook at high temperature are effectively avoided;

[0016] The hook can adopt an integral structure, and the fixed section and the clamping section are continuously formed, reducing the manufacturing and installation difficulty and improving the positioning accuracy;

[0017] The integrated cooling and limiting design enables the hook to maintain a long-term stable working state under harsh thermal conditions, significantly improving the service life and operation safety of the heat insulation module.

[0018] A technical solution provided by this application further has the following technical features:

[0019] Preferably, in an embodiment of this application, the clamping section is connected to the end of the heat shield, and the clamping section axially limits the heat shield; a side groove is provided on the side of the heat shield, and the end hook is used to catch the side groove of the heat shield to radially fix the heat shield.

[0020] Preferably, in an embodiment of this application, the end hook and the side groove of the heat shield form a cooling cavity, and after the cold air enters the cooling cavity, it flows out from both sides.

[0021] Preferably, in an embodiment of this application, after the hook and the heat shield are installed and matched, the side groove and the air inlet hole are arranged adjacent to each other.

[0022] Preferably, in an embodiment of this application, positioning holes are provided on both the spring piece and the fixed section, and they are correspondingly matched with the positioning holes on the combustion chamber housing.

[0023] Preferably, in an embodiment of this application, the limiting section adopts the form of limiting section III, one end of the limiting section III is connected to the end hook, and the other end of the limiting section III is connected to the fixed section.

[0024] Preferably, in an embodiment of this application, the limiting section adopts the form of limiting section II, one end of the limiting section II is connected to the end hook, and the other end of the limiting section II is connected to a position on the clamping section other than the end hook.

[0025] Preferably, in an embodiment of this application, the end hook is an S-shaped hook, and the protruding part abuts against the heat shield.

[0026] Preferably, in an embodiment of this application, a limiting block is provided on one side of the outer wall of the clamping section, and the limiting block is arranged at the connection between bending section I and bending section II, so that the retention gap between adjacent hooks forms a cooling air flow channel.

[0027] Preferably, in an embodiment of this application, the limiting block is located on the right side of the outer wall of the clamping section and is integrally formed with the clamping section.

[0028] Preferably, in an embodiment of this application, the limiting section adopts the form of limiting section I, and the limiting section I and the spring piece are of an integrally formed structure.

[0029] Preferably, in an embodiment of this application, the fixed section and the clamping section are of an integrally formed structure.

[0030] Preferably, in an embodiment of this application, the spring piece includes positioning hole I and straight section I; a positioning hole I is provided at the end of the spring piece; there is an inclination of 3° - 5° between the straight section where the positioning hole I is located and the straight section I.

[0031] Preferably, in an embodiment of the present application, the fixed section and the spring piece are attached to each other.

[0032] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention.

[0033] In order to solve the problems such as easy wear of the heat insulation tile of the gas turbine combustion chamber under the erosion of high-temperature gas, failure of hook fixing, and falling off of the tile block, an integrated hook structure including a fixed section, a clamping section, a limiting section and a spring piece is adopted, and a cooling air flow channel, a cooling cavity composed of an air inlet hole and a terminal hook, and a limiting block and other structural designs are introduced, overcoming the defects such as insufficient cooling effect, easy thermal deformation of the structure, and poor installation stability in the existing double-sided fixing method, and achieving the following technical effects:

[0034] 1. Improve the heat resistance of the structure: Guide the cold air flow through the air inlet hole and the terminal hook cooling cavity, effectively reduce the temperature of the heated part of the hook, and slow down the high-temperature ablation process;

[0035] 2. Enhance the fixing stability: The spring piece provides a pre-tightening force and has a vibration damping and buffering function, preventing the hook from loosening under vibration conditions and improving the fixing reliability of the tile block;

[0036] 3. Prevent the hook from thermal deformation: Limit and constrain the terminal hook by setting a limiting section to prevent it from warping and deforming at high temperatures and maintain the clamping force;

[0037] 4. Optimize the cooling air flow path: The limiting block and the bending structure of the clamping section jointly form a cold air channel to ensure uniform air flow distribution and improve the overall cooling efficiency;

[0038] 5. Improve the assembly accuracy and repeatability: Through the design of positioning holes, achieve precise assembly of the hook and the combustion chamber housing, facilitating maintenance and replacement;

[0039] 6. Prolong the service life of components: The integrally formed structure reduces the weak points of welding or connection, improves the overall structural strength, and enhances the service life under high-temperature conditions;

[0040] The technical solution of the present application starts from the dual perspectives of structural optimization and cooling performance, systematically improving the service stability and safety of the combustion chamber heat insulation module, and is applicable to efficient heat insulation protection in long-term high-temperature and high-stress environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0042] Figure 1 is the front view of a fixing device for a heat insulation module of a gas turbine combustion chamber of the present invention;

[0043] Figure 2 Schematic diagram of the use and fixing device of a heat insulation module for a gas turbine combustion chamber according to the present invention;

[0044] Figure 3 Stereogram of the use state of a fixing device for a heat insulation module of a gas turbine combustion chamber according to the present invention;

[0045] Figure 4 Schematic diagram of the structure of a fixing device for a heat insulation module of a gas turbine combustion chamber according to the present invention;

[0046] Figure 5 Schematic diagram of the form structure of the limiting section Ⅰ of a fixing device for a heat insulation module of a gas turbine combustion chamber according to the present invention;

[0047] Figure 6 Schematic diagram of the structure of a spring piece of a fixing device for a heat insulation module of a gas turbine combustion chamber according to the present invention;

[0048] Figure 7 Schematic diagram of the structure of a fixing device for a heat insulation module of a gas turbine combustion chamber according to the present invention;

[0049] Figure 8 Schematic diagram of the cooling cavity of a fixing device for a heat insulation module of a gas turbine combustion chamber according to the present invention;

[0050] Figure 9 Schematic diagram of the installation structure of a fixing device for a heat insulation module of a gas turbine combustion chamber according to the present invention;

[0051] Figure 10 Schematic diagram of the form structure of the limiting section Ⅱ of a fixing device for a heat insulation module of a gas turbine combustion chamber according to the present invention;

[0052] Figure 11 Schematic diagram of the form structure of the limiting section Ⅲ of a fixing device for a heat insulation module of a gas turbine combustion chamber according to the present invention;

[0053] Figure 12 Schematic diagram of the variant structure of the limiting section Ⅰ of a fixing device for a heat insulation module of a gas turbine combustion chamber according to the present invention;

[0054] Figure 13 Picture of the ablation of the bracket corner of the existing heat insulation module of the gas turbine combustion chamber at high temperature;

[0055] Elements in the figure:

[0056] 1. Limiting section Ⅰ

[0057] 2. Spring piece

[0058] 3. Fixed section

[0059] 4. Clamping section

[0060] 5. Starting part

[0061] 6. Connecting part

[0062] 7. Overlapping part

[0063] 8. Positioning hole Ⅰ

[0064] 9. Straight section Ⅰ

[0065] 10. Air inlet hole

[0066] 11. Limiting block

[0067] 12. Bending part Ⅰ

[0068] 14. Bending part Ⅱ

[0069] 13. End hook

[0070] 15. Positioning hole Ⅱ

[0071] 16. Straight section Ⅱ

[0072] 17. Heat insulation tile

[0073] 18. Cooling cavity

[0074] 19. Hook

[0075] 20. Side groove

[0076] 21. Limiting section Ⅱ

[0077] 22. Integral limiting section

[0078] 23. Segmented limiting section

[0079] 24. Limiting section Ⅲ. Specific embodiments

[0080] The following further describes in detail the specific embodiments of the present application with reference to the accompanying drawings. These embodiments are only for illustrating the present application and are not intended to limit the present invention.

[0081] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0082] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0083] In addition, in the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0084] Such as Figures 1-9 , a fixing device for a heat insulation module of a gas turbine combustor, including a hook 19, the hook 19 is used to fix a heat insulation tile 17 on a combustor housing, and the hook 19 includes a fixing section 3, a clamping section 4, and a spring piece 2;

[0085] The fixing section 3 is used to connect the combustor housing; the fixing section 3 is connected to the clamping section 4;

[0086] The clamping section 4 is used to fix the heat insulation tile 17; the clamping section 4 includes a bending portion I 12, a terminal hook 13, and a bending portion II 14. The side close to the fixing section 3 is the bending portion I 12, and the side far from the fixing section 3 is the bending portion II 14. The terminal hook 13 is arranged at the end of the clamping section 4 far from the fixing section 3, and the terminal hook 13 is used to fix the heat insulation tile 17 and guide the cold air flow;

[0087] The spring piece 2 is arranged on the side surface of the fixing section 3 close to the heat insulation tile 17, and the spring piece 2 is used to fix the heat insulation tile 17 and buffer and damp vibration;

[0088] An air inlet hole 10 is arranged in the middle of the bending portion I 12, and the air inlet hole 10 is used for the cold air flow;

[0089] The technical solution of the present application has the following technical features: In order to solve the problem of the fixing failure of the hook in the gas turbine combustor, a structural means of restricting the thermal deformation of the hook-shaped end of the clamping section of the hook is adopted, overcoming the defect that the prior art generally only relies on improving the cooling capacity to reduce the ablation of the hook and cannot fundamentally prevent the loss of the fixing force caused by thermal deformation, and achieving the technical effect of effectively maintaining the stable pre-tightening force of the clamping section of the hook on the heat insulation tile block in the high-temperature gas direct impact environment, thereby significantly improving the reliability and service life of the hook.

[0090] The working conditions faced by the present application are as follows:

[0091] 1. Service environment / working conditions:

[0092] The working conditions of the combustor where it serves:

[0093] i. Inlet temperature range: 1200℃-1400℃

[0094] ii. Inlet pressure range: 1700kpa-2000kpa

[0095] iii. Gas velocity range: 20-100m / s

[0096] iv. Main inlet flow range: 2-20kg / s

[0097] v. Cooling temperature range: 400-600℃

[0098] 2. Hook material:

[0099] Nickel-based superalloy

[0100] 3. Hook service temperature range:

[0101] i. Hot surface temperature range: 600℃-800℃, in extreme cases the maximum temperature may reach 1100℃ or even higher, the temperature of the entire hook end is not uniform, such as Figure 13 ,In the high temperature area, the corners are ablated under high temperature, and the end hook is severely deformed and ,warped up.

[0102] 4. Is it applicable to extreme working conditions?

[0103] The hook material and process can be applied to extreme working conditions. Since the entire combustion chamber of the engine is not uniform, there are local high temperatures or flame intrusion that causes the hook to become hot. This application is mainly aimed at these local extreme working conditions, which can reflect the technical effect of improving key points and maintain the original intention of the design.

[0104] 5. Size range of thermal insulation tiles:

[0105] The present invention is applicable to ceramic heat-insulating tiles with side grooves and cooling holes. Length range: 160mm-210mm

[0106] Width range: 190mm-195mm Thickness range: 36mm-42mm

[0107] 6. Does the change in the size of the insulation tile affect the hook?

[0108] No effect on the hooking condition within the insulation tile size range mentioned above

[0109] 7. Thermal deformation range of the hook end of the existing technology:

[0110] Set the initial hook installation deformation (pre-deformation) to 100%, and a single hook can provide a pre-tightening force of 325 N. After the hook is heated, its deformation will decrease, that is, the hook thermal deformation = (measured deformation displacement / pre-deformation displacement) × 100%. The pre-tightening force will also decrease accordingly. At the highest design temperature, it can reach about 90% of the design value, that is, 292.5 N. However, due to the uneven temperature distribution in the combustion chamber and the fluctuations of flame combustion, in local areas, flame intrusion is likely to occur, resulting in abnormal temperature at the end of the hook. Under the current service conditions, the thermal deformation will decrease to 35%-45% of the initial pre-deformation at most, and the pre-tightening force will decrease to 114-149 N. In the event of an extreme unit acceleration condition, it will not be able to meet the requirements of safe service.

[0111] In the prior art, the limit value of the end hook deformation:

[0112] When the thermal deformation decreases to 35% under the current service conditions, the hook only provides a pre-tightening force of 114 N. If the unit acceleration is too large, the 114 N force cannot press the tile tightly, resulting in a collision between the tile and the cylinder block under extreme conditions, affecting the safe service of the tile and the unit;

[0113] Comparing the thermal deformation range of the end hook of the present invention:

[0114] Set the initial hook installation deformation (pre-deformation) to 100%, and a single hook can provide a pre-tightening force of 325 N. After the hook is heated, its deformation will decrease, and the pre-tightening force will also decrease accordingly, that is, the hook thermal deformation = (measured deformation displacement / pre-deformation displacement) × 100%. Under the service conditions in the most severe area, the thermal deformation of the hook of the present invention will be maintained above 80% of the initial pre-deformation, and can continuously provide a pre-tightening force of more than 260 N. According to the weight of the 4 kg tile, even if all 4 hooks are ablated under extreme conditions, it can still cope with an acceleration value exceeding 26 G and meet the limit (20 G) condition of the unit.

[0115] In order to ensure the downward pressure in this application, the elasticity of the bottom elastic segment is emphasized, and two layers of elastic sheets are designed in order to provide a fixed pressing force. However, in a system, the weakest link is the one that needs to be strengthened the most. The elastic sheet area is purged by cold air, and its strength can be maintained. However, at the end of the hook, especially the bending section, it is very easy to deform at high temperatures in abnormal areas such as the gas intrusion area, resulting in a decrease in the deformation of the elastic sheet and a decrease in the provided pressing force. This application adds a limiting section to the hook in the prior art to limit the thermal deformation of the end hook through the limiting section, which is an effective strengthening for the weak link, enabling it to maintain a certain force to fix the heat insulation tile at high temperatures, thereby achieving the corresponding technical effects;

[0116] The limiting section can be implemented by three structures: limiting section Ⅰ, limiting section Ⅱ, and limiting section Ⅲ, as well as their variant structures;

[0117] During the design process of the hook in the prior art, the main purpose is to increase the pre-tightening force so as to fix the segment, ensuring that the hook can be used normally under conventional working conditions, that is, when the service temperature of the hook is between 600 - 800 °C; with the improvement of the unit parameters, the temperature at the end of the hook in the local abnormal working condition area increases, while the deformation amount of the elastic sheet at the bottom of the hook is the same and the temperature there is low, resulting in the bending section of the hook becoming a weak link. This application aims to strengthen this weak link. To cope with sudden extreme working conditions, while ensuring normal operation, it can overcome the adverse effects of sudden extreme working conditions and ensure the operation load range;

[0118] The commonly adopted method to solve the problem of hook fixing failure is to increase the cooling air volume to cool the end; however, when the cooling air increases, the unit efficiency will be greatly reduced. The advantage of the auxiliary measure adopted in this application is that it can improve the anti-deformation ability of the hook without sacrificing the unit efficiency, maintain the downward pressure, and ensure the safety of the segment and the unit when dealing with large accelerations.

[0119] In this application, by introducing a reasonable slope and the structure of the limiting section Ⅰ1 in the design of the spring sheet 2, the fixing section 3, and the clamping section 4, the hook 19 can, under the action of high-temperature and high-pressure gas flow for a long time, offset the thermal stress through self-adaptive deformation, thus effectively reducing the deformation amount of the end hook 13; this structural innovation enables the hook to continuously maintain sufficient pre-tightening force and fixing force in the environment where high-temperature gas flows through, avoiding the loosening of the heat insulation tile 17 due to thermal expansion or external impact. In addition, the design of the limiting block 11 forms a predetermined air flow channel between adjacent hooks 19, effectively preventing the obstruction of the cooling air flow, thereby ensuring the uniformity of the cooling air flow and further avoiding the problems of thermal deformation and hook ablation caused by uneven cooling;

[0120] It can be significantly distinguished from the prior art. By optimizing the structure to suppress thermal deformation, it not only improves the durability of the hook under extreme conditions, but also enhances the long-term stability of the heat insulation tile, greatly improving the reliability of the heat insulation system of the gas turbine combustion chamber, reducing the maintenance frequency and cost, and solving the failure problems caused by uneven thermal stress and cooling air flow distribution in the prior art;

[0121] The working process of this application is as follows:

[0122] During the operation of the gas turbine, the internal environment temperature of the combustion chamber shell is extremely high. To prevent the metal shell from overheating and damage, it is necessary to reliably fix the heat insulation tile 17 on the inner wall of the shell; the hook 19, as the main fixing component of the heat insulation tile 17, realizes the stable clamping and thermal protection of the heat insulation tile 17 through the coordinated action of its fixing section 3, clamping section 4, and spring sheet 2;

[0123] During operation, the fixed section 3 of the hook 19 is first firmly connected to the combustion chamber housing by means such as screwing, welding or positioning holes, forming a structural support foundation; the clamping section 4 extends through the bending point I 12, and a bending point II 14 and a terminal hook 13 are provided at its end. The deformation design of the clamping section 4 gives it a certain elasticity, and it can be inserted into the end and side grooves of the heat insulation tile 17 during installation. Through the hooking action of the terminal hook 13, the radial and axial fixation of the heat insulation tile 17 is achieved;

[0124] Meanwhile, the spring piece 2 is attached to the side of the fixed section 3 close to the heat insulation tile 17. When the hook 19 presses the heat insulation tile 17, the spring piece 2 provides an inward elastic pre-tightening force, which not only enhances the clamping stability, but also absorbs small displacements under the conditions of equipment vibration or thermal expansion and contraction, playing a role in vibration damping and buffering, and preventing the heat insulation tile from loosening or misaligning;

[0125] During high-temperature operation, the cooling gas flows from the inside of the housing into the clamping section 4 of the hook 19, enters the air inlet hole 10 in the middle of the bending point I 12, and then flows along the inside of the clamping section to the area of the terminal hook 13; the special structural design of the terminal hook 13 guides the cold air to cover the heat-sensitive area of the hook, forming a local cooling gas film, effectively reducing the risk of structural deformation and ablation caused by thermal stress, thereby ensuring the long-term stable operation of the fixing device under the erosion of high-temperature combustion gas.

[0126] Specifically, in an embodiment of the present application, in the first case of the limiting section, there are 5 ways to set the limiting section, such as Figure 1 、 4 ,for Figure 12 A, and such as Figure 12 variant B, C, D, F; including a length range (5 mm - bending II), a width range (5 mm - equal width to the terminal hook - even wider than the terminal hook), a thickness range (1 mm - 3 mm); an angle range (3° - 5°), the limiting section and the spring piece can be integrally formed or realized by welding. The material of the limiting section can be the same as that of its spring piece, or a more erosion-resistant material can be selected.

[0127] Specifically, in an embodiment of the present application, such as Figure 10 ,in the second case of the limiting section, a welding block is added inward at the bending II to limit the thermal deformation of the terminal hook, such as the size, angle, distribution method, etc. of the welding block. At this time, the limiting section and the clamping section can be integrally formed or realized by welding. The material can be the same as that of the clamping section, or a more erosion-resistant material can be selected.

[0128] Specifically, in an embodiment of the present application, such as Figure 11 ,in the third case of the limiting section: another case of the limiting section is a supplement to, the limiting section can be connected to the side wall of the clamping section, and its angle range is (20° - 45°), and the remaining settings can be the same as those in the first case of the limiting section.

[0129] Specifically, in an embodiment of the present application, the clamping section 4 is connected to the end of the heat shield 17, and the clamping section 4 axially positions the heat shield 17; a side groove 20 is provided on the side surface of the heat shield 17, and the end hook 13 is used to engage with the side groove 20 of the heat shield 17 to radially fix the heat shield 17; with the above structure, when installing, the heat shield 17 is inserted into the clamping section 4 of the hook 19, and the axial contact surface of the clamping section 4 fits with the end of the heat shield 17 to form an effective axial limit, thereby preventing the heat shield 17 from generating axial displacement under the action of thermal stress; at the same time, the side groove 20 of the heat shield 17 and the end hook 13 are cooperatively engaged, and the radial locking is realized by using the shape of the hook part, enhancing the overall fixing strength; this structure enables the heat shield 17 to be stably positioned under high-temperature scouring and mechanical vibration, significantly improving the service reliability and service life of the device, and further ensuring the long-term safe operation of the combustion chamber.

[0130] Specifically, in an embodiment of the present application, a cooling cavity 18 is formed between the end hook 13 and the side groove 20 of the heat shield 17, and the cold air enters the cooling cavity 18 and flows out from both sides; after the hook 19 and the heat shield 17 are installed and matched, the side groove 20 and the air inlet hole 10 are arranged adjacent to each other; positioning holes are provided on both the spring piece 2 and the fixed section 3, and they are correspondingly matched with the positioning holes on the combustion chamber housing; one end of the limiting section III 24 is connected to the end hook 13, and the other end of the limiting section III 24 is connected to the fixed section 3, and the limiting section III 24 is used to limit the thermal deformation of the end hook 13.

[0131] In the embodiment, by engaging the end hook 13 with the side groove 20 of the heat shield 17, a cooling cavity 18 is formed, and the air inlet hole 10 is used to guide the cold air into the cooling cavity. The cold air evenly flows out along the gaps on both sides of the heat shield 17 in the cavity, thereby effectively cooling the clamping section 4 of the hook 19 and the end of the heat shield under high-temperature working conditions, reducing the accumulation of thermal stress and the material ablation rate; the positioning holes provided on the spring piece 2 and the fixed section 3 of the hook 19, through precise cooperation with the positioning holes on the combustion chamber housing, can ensure the stable and reliable installation position of the hook, enhancing the assembly accuracy and working stability of the overall structure; the limiting section I 1 bridges the end hook 13 and the fixed section 3, effectively limiting the warping deformation of the hook-shaped end of the clamping section, further maintaining the stability of the pre-tightening force after long-term high-temperature operation, so as to achieve the comprehensive technical effects of improving the service life of the hook structure, preventing the heat shield from loosening, and optimizing the cooling effect.

[0132] Specifically, in an embodiment of the present application, the end hook 13 is an S-shaped hook, and the protruding part abuts against the heat shield 17; in an embodiment, the end hook 13 is an S-shaped hook structure, and its protruding part forms a surface contact with the side wall of the heat shield 17 after installation. The radial fixing strength is improved through the pressing action of this contact area, enhancing the structural stability; at the same time, the S-shaped structure enables the end hook 13 to have a certain flexibility under the working conditions of thermal expansion and contraction and gas erosion. With the connection constraint of the limiting section I1, it can effectively prevent the end hook 13 from warping outwards, maintain a continuous pre-tightening force and clamping state, further inhibit the risk of the heat shield loosening and extend the service life of the hook.

[0133] Specifically, in an embodiment of the present application, a limiting block 11 is provided on one side of the outer wall of the clamping section 4. The limiting block 11 is arranged at the connection between the first bending section 12 and the second bending section 14, so as to form a cooling air flow channel with the retention gap between adjacent hooks 19; the limiting block 11 is located on the right side of the outer wall of the clamping section 4 and is integrally formed with the clamping section 4; the limiting section I1 and the spring piece 2 are an integrally formed structure; the fixing section 3 and the clamping section 4 are an integrally formed structure;

[0134] In an embodiment, a limiting block 11 is provided on one side of the outer wall of the clamping section 4. The limiting block 11 is located in the connection area between the first bending section 12 and the second bending section 14. Its setting position keeps a reasonable gap between adjacent hooks 19, forming a stable cooling air flow channel, effectively guiding the cold air to flow along the surface of the heat shield 17 to reduce the thermal load; the limiting block 11 is integrally formed with the clamping section 4 to ensure the structural strength and positioning accuracy, avoiding affecting the cooling effect or interfering with the installation due to component deformation; at the same time, the limiting section I1 and the spring piece 2, the fixing section 3 and the clamping section 4 all adopt an integrally formed process, reducing the problems of thermal fatigue and structural stress concentration at the connection parts, improving the overall assembly stability and long-term service reliability, and further ensuring that the hook 19 maintains stable pre-tightening and limiting performance in a high-temperature environment.

[0135] Specifically, in an embodiment of the present application, the spring piece 2 includes a positioning hole I8 and a straight section I9; a positioning hole I8 is provided at the end of the spring piece 2; there is an inclination of 3° - 5° between the straight section where the positioning hole I8 is located and the straight section I9; the fixing section 3 and the spring piece 2 are attached and arranged.

[0136] In the embodiment, the spring piece 2 includes a positioning hole Ⅰ8 and a straight section Ⅰ9. The positioning hole Ⅰ8 is located at the end of the spring piece 2 and is used to ensure the precise fixation of the spring piece 2 to the combustion chamber housing. Both the straight section Ⅰ9 and the straight section where the positioning hole Ⅰ8 is located have an inclination of 3° - 5°. The inclination design helps to form an appropriate pre-tightening force during the installation process, enabling the spring piece 2 to fix the heat insulation tile 17 more firmly. At the same time, it provides sufficient elastic deformation in a high-temperature environment to absorb vibrations and reduce the impact of thermal shock. The fixing section 3 and the spring piece 2 are arranged in a fitting manner, achieving the tight combination of the two, ensuring the stability of the entire hook 19 structure and the reliability during long-term operation, and avoiding the risk of loosening or position deviation of the clamping section 4 and the heat insulation tile 17 due to uneven cold air flow or high-temperature effects.

[0137] There are two ways to solve the problem of hook fixation failure. One is to reduce the ablation frequency of the hook. In order to improve the efficiency of the gas turbine, the design optimizations are all aimed at reducing the cold air. Therefore, reducing the ablation frequency of the hook can only be achieved by increasing the cold air at the hook. Through technical research, the current methods to reduce hook ablation include setting cooling holes in the clamping section, coating a protective coating on the clamping section, opening holes in the clamping section tile, and connecting an external heat insulation part to the clamping section, etc. The other is to reduce the deformation amount of the hook-shaped end of the hook clamping section, that is, to optimize the hook design and limit the deformation of the hook-shaped end of the clamping section to avoid the decrease of the pre-tightening force of the hook. The heat insulation screen hook structure that can inhibit loosening in this application is of great significance.

[0138] Specifically, in an embodiment of this application, a structural design for restricting the deformation of the hook-shaped end of the hook clamping section is proposed. This design is a fixing device for the heat insulation tile of a gas turbine combustion chamber. By adding a connecting device that restricts the deformation of the clamping section, it is ensured that the hook does not deform under the long-term scouring of high-temperature gas, thereby playing a role in inhibiting the loosening of the tile. The hook 19 is used to fix the ceramic heat insulation tile 17 to the combustion chamber housing and includes:

[0139] A fixing section 3, and the fixing section 3 is used to connect the combustion chamber housing;

[0140] A clamping section 4, the clamping section 4 is connected to the fixing section 3 and is used to fix the ceramic heat insulation tile 17; the clamping section 4 is used to abut against the end of the ceramic heat insulation tile 17 to axially limit the ceramic heat insulation tile 17;

[0141] A spring piece 2, the spring piece 2 is connected to one side of the fixing section 3 and is used to fix the ceramic tile and buffer and damp vibrations;

[0142] An air inlet hole 10, the air inlet hole 10 is located on the bending section Ⅰ12, and the cooling air enters from here for cold air circulation; the cold air at the back enters from the air inlet hole 10 and circulates along the gap between the end of the ceramic heat insulation tile 17 and the clamping section 4. The end hook 13 and the side groove 20 of the ceramic heat insulation tile 17 form a cooling cavity 18, and after the cold air enters the cooling cavity 18, it flows out from both sides;

[0143] The end hook 13 is used to fix the ceramic heat insulation tile 17 and guide the cold air flow; the end hook 13 is limited in the side groove 20 of the ceramic heat insulation tile 17 to radially fix the ceramic heat insulation tile 17;

[0144] One end of the limiting section III 24 is connected to the end hook 13, and the other end of the limiting section III 24 is connected to the fixing section 3. The limiting section III 24 is used to limit the thermal deformation of the end hook 13.

[0145] The hook 19 is connected to the positioning hole in the installation groove of the combustion chamber housing through the spring piece 2 and the positioning hole of the fixing section 3 to connect the hook 19 to the combustion chamber housing; the ceramic heat insulation tile 17 is fixed by the clamping section 4 of the hook 19. The clamping section 4 abuts against the end of the ceramic heat insulation tile 17 to axially limit the ceramic heat insulation tile 17, while the end hook 13 is stuck in the side groove 20 of the ceramic heat insulation tile 17 to radially fix the ceramic heat insulation tile 17; by adding a limiting section I 1 between the end of the spring piece 2 and the end hook 13, the thermal deformation of the end hook 13 is limited;

[0146] The limiting block 11 is located on one side of the outer wall of the clamping section 4 and is used to limit the adjacent hooks 19 from fitting together, avoiding the situation where the cooling air cannot flow when the hooks 19 are in contact during the movement of the tile; it can limit the complete fitting of the adjacent hooks 19, ensuring that the cooling air can flow normally when the hooks 19 are in contact during the movement of the tile, thus avoiding the situation of ablation of the hooks 19 caused by insufficient cold air;

[0147] The spring piece 2 and the fixing section 3 are connected by a solder joint. A through hole is provided in the straight section of the connection side. The straight section of the connection side is punched by a punching die. By applying pressure, the upper die is pressed down to prepare a positioning through hole on the metal plate. The positioning pin is fixed to the combustion chamber housing through the through hole;

[0148] The spring piece 2 includes a positioning hole I 8, a straight section I 9, and a positioning through hole, and is integrally formed with the limiting section I 1. The straight section has a slope of 3° - 5°;

[0149] The structural design for limiting the deformation of the end hook 13 can ensure that the hook 19 does not deform under the long-term scouring of high-temperature gas, thus playing a role in inhibiting the loosening of the tile;

[0150] The positioning hole I 8, the air inlet hole 10, and the through hole are any one of a round hole or an oval hole.

[0151] Specifically, in an embodiment of the present application, the fixing section 3 and the clamping section 4 are integrally formed. The fixing section 3 includes a straight section and a positioning through hole. The slope of the straight section of the fixing section 3 is the same as that of the straight section I 9. The clamping section 4 includes a connection area with the fixing section 3, a bending area, an air inlet hole at the bending place, a limiting block, and a hook-shaped end;

[0152] The limiting segment I1, as an extension of the spring piece 2, overlaps with the end hook 13, including a starting part 5, a connecting part 6, and a lapping part 7;

[0153] The starting part 5 starts from the middle of the end of the spring piece 2, with the same width and thickness as the thickness of the clamping segment 4, and an inclination of 5° - 20°;

[0154] The connecting part 6 connects the starting part 5 and the lapping part 7, with the same width and thickness as the starting part 5;

[0155] The thickness of the lapping part 7 is the same as that of the connecting part 6, and the width can be freely adjusted according to requirements. The minimum adjustment range is the same as the width, and the maximum is the same as the width of the end hook 13. The length can also be freely adjusted according to requirements. The minimum adjustment range is the same as the length of the end hook 13, and the maximum can reach the bending position of the side wall of the clamping segment 4. The outer shape fits the area of the lapping clamping segment 4;

[0156] Such as Figure 7 The fixed segment 3 includes a positioning hole II15 and a straight segment II16;

[0157] Such as Figure 10 、 11 This application provides hooks 19 with different length structures and their corresponding limiting segments II21;

[0158] The integral limiting segment 22 is of an integral structure; the segmented limiting segment 23 is of a segmented structure; and the limiting segment III24 gives a layout form. One end of the limiting segment III24 is connected to the connection of the bending position I12 and the bending position II14, and the other end is connected to the middle of the end hook 13;

[0159] The limiting block 11 is located on the right side of the outer wall of the clamping segment 4 and is integrally formed with the clamping segment 4, restricting the complete fitting of adjacent hooks 19, which can ensure the normal flow of cooling air when the hooks 19 are connected during the movement of the tile, thereby avoiding the situation of hook 19 ablation caused by insufficient cooling air;

[0160] The hook 19 of the present invention is used for the fixing device of the ceramic heat insulation tile 17 in the gas turbine combustion chamber. The end hook 13 of the clamping segment 4 axially and radially limits the tile through a hook-shaped design, which can effectively fix the tile. At the same time, it can also prevent the axial gap between adjacent ceramic heat insulation tiles 17 from being too large, reducing the risk of high-temperature gas intrusion and effectively protecting the combustion chamber shell.

[0161] Specifically, in an embodiment of the present application, the hook 19 can apply a pre-tightening force to the tile by utilizing the self-elastic deformation of the spring piece 2, so that the tile can be stably fixed on the hook 19, effectively suppressing the loosening of the tile. At the same time, the elasticity of the spring piece 2 can not only compensate for the errors existing in the manufacturing and installation processes of the tile, but also make the installation and disassembly processes of the tile more convenient and labor-saving. In addition, during the operation of the gas turbine, the generated vibrations and thermal and cold shocks can be mitigated through the elastic deformation of the spring piece 2, effectively reducing the risk of damage and fracture of the tile during operation.

[0162] Specifically, in an embodiment of the present application, compared with the prior art which changes the cooling channel and increases the cold air volume to achieve the purpose of reducing the thermal deformation amount at the limit end; the working condition at this deformed part is similar to the end hook 13 at the contact part of the ceramic heat insulation tile 17 in the present application, and a limiting section is provided at the hook-shaped end of the clamping section 4 of the hook 19 of the present invention. By adding a connecting device that restricts the deformation of the clamping section 4, it is ensured that the hook 19 does not deform under the long-term scouring of high-temperature gas, thereby achieving the goal of reducing the thermal deformation amount at the hook-shaped end of the clamping section 4. Compared with the prior art, the present invention more economically and effectively extends the service life of the hook 19.

[0163] Specifically, in an embodiment of the present application, for the hook 19 in the prior art, the initial hook installation deformation amount (pre-deformation amount) is set to 100%, and a single one can provide a pre-tightening force of 325N. After the hook is heated, its deformation amount will decrease, that is, the hook thermal deformation amount = (measured deformation displacement / pre-deformation displacement) × 100%. The pre-tightening force will also decrease accordingly. At the highest design temperature, it can reach about 90% of the design value, that is, 292.5N. After long-term scouring by high-temperature gas, the end hook 13 of the clamping section 4 tilts upward, and the thermal deformation amount will drop to 35%-45% of the initial pre-deformation amount at most, and the pre-tightening force drops to 114-149N; for the hook 19 of the present invention, a single one can also provide a pre-tightening force of 325N at normal temperature, and after long-term scouring by high-temperature gas, the end hook 13 of the clamping section 4 can still fit with the ceramic heat insulation tile 17, and the thermal deformation amount will be maintained above 80% of the initial pre-deformation amount, and a pre-tightening force of more than 260N can be continuously provided. The hook 19 of the present invention can still provide a relatively high pre-tightening force after long-term high-temperature operation, effectively suppressing the loosening of the tile and greatly extending the service life of the hook 19.

[0164] The hook 19 of the present invention is provided with cooling holes at the bending part I12, and a cooling chamber is formed between the end hook 13 and the hook groove of the ceramic heat insulation tile 17. The cold air enters through the cooling holes and flows along the gap between the end of the ceramic heat insulation tile 17 and the clamping section 4, cooling the clamping section 4 and the end and bottom surface of the heat insulation tile, reducing the temperature difference between the heat insulation tile and the clamping section 4, reducing the ablation effect caused by heat conduction on the clamping section 4, and at the same time reducing the ablation effect of the hot gas on the clamping section 4, thereby extending the service life of the hook 19.

[0165] The hook 19 of the present invention is provided with a limiting section between the end of the fixed section 3 and the end hook 13. By adding a connecting device that restricts the deformation of the clamping section 4, it is ensured that the hook 19 does not deform under the long-term scouring of high-temperature gas. This not only extends the service life of the hook 19, effectively reduces the loss of the hook 19, but also plays a role in suppressing the loosening of the tile.

[0166] Generally speaking, the present invention aims to solve the technical problems of the fixing failure of the hook of the heat insulation tile in the existing gas turbine combustion chamber under the scouring of high-temperature gas and the easy falling off of the tile. It adopts a hook structure including a fixed section, a clamping section, a limiting section and a spring piece, and sets a bending structure, an end hook, an air inlet hole and other cooling channel structures in the clamping section, effectively overcoming the defects of the exposure, easy ablation and thermal deformation of the clamping section of the hook in the existing double-sided fixing method;

[0167] By setting an air inlet hole and an end hook cooling cavity in the clamping section, the cold air can flow to the key heat-receiving parts of the hook, significantly reducing the local temperature; the setting of the spring piece not only enhances the stable fixing of the heat insulation tile, but also has a buffering and vibration damping effect, further improving the anti-vibration reliability of the system; the cooling cavity structure formed by the end hook and the side groove of the heat insulation tile can guide the cold air to flow out from both sides, optimizing the cooling path and effectively preventing the hook from failing;

[0168] This fixing device integrates the functions of cooling, limiting and buffering through its structure, realizing the reliable fixing of the heat insulation tile under high-temperature and strong-scouring working conditions, and achieving remarkable technical effects of improving the service life of the hook, avoiding the falling off of the tile and enhancing the safety.

[0169] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A fixing device for a heat insulation module of a gas turbine combustion chamber, comprising a hook for fixing a heat insulation tile to a combustion chamber housing, characterized in that, The hook includes a fixed section, a clamping section, a limiting section, and a spring piece; The fixed section is used to connect to the combustion chamber housing; the fixed section is connected to the clamping section; The clamping section is used to fix the heat insulation tile; the clamping section includes a bend I, a terminal hook, and a bend II. The side closer to the fixed section is the bend I, and the side farther from the fixed section is the bend II. The terminal hook is arranged at the end of the clamping section away from the fixed section, and the terminal hook is used to fix the heat insulation tile and guide the cold air to flow; One end of the limiting section is connected to the terminal hook, and the other end of the limiting section is connected to a position on the clamping section other than the terminal hook, or the fixed section, or the end of the spring piece. The limiting section is used to limit the thermal deformation of the terminal hook; The spring piece is arranged on the side of the fixed section close to the heat insulation tile, and the spring piece is used to fix the heat insulation tile and buffer and damp vibration; An air inlet hole is arranged in the middle of the bend I, and the air inlet hole is used for the cold air to flow through.

2. The fixing device for the heat insulation module of a gas turbine combustion chamber according to claim 1, characterized in that, The end of the clamping section is connected to the end of the heat insulation tile, and the clamping section axially limits the heat insulation tile; a side groove is arranged on the side of the heat insulation tile, and the terminal hook is used to position the side groove of the heat insulation tile to radially fix the heat insulation tile.

3. The fixing device for the heat insulation module of a gas turbine combustor according to claim 2, characterized in that, The terminal hook and the side groove of the heat insulation tile form a cooling cavity, and after the cold air enters the cooling cavity, it flows out from both sides.

4. A fixing device for a heat insulation module of a gas turbine combustion chamber according to claim 2, characterized in that, After the hook and the heat insulation tile are installed and matched, the side groove and the air inlet hole are arranged adjacent to each other.

5. A fixing device for a heat insulation module of a gas turbine combustion chamber according to claim 1, characterized in that One end of the limiting section is connected to the terminal hook, and the other end of the limiting section is connected to the fixed section. The limiting section is used to limit the thermal deformation of the terminal hook.

6. The fixing device for the heat insulation module of a gas turbine combustor according to claim 5, characterized in that, The terminal hook is an S-shaped hook, and the protruding part abuts against the heat insulation tile.

7. The fixing device for the heat insulation module of a gas turbine combustion chamber according to claim 1, characterized in that, A limiting block is arranged on one side of the outer wall of the clamping section. The limiting block is arranged at the connection between the bend I and the bend II, so that the adjacent hooks maintain a gap to form a cooling air flow channel.

8. The fixing device for the heat insulation module of a gas turbine combustion chamber according to claim 7, characterized in that, The limiting block is located on the right side of the outer wall of the clamping section and is integrally formed with the clamping section.

9. The fixing device for the heat insulation module of a gas turbine combustor according to claim 1, characterized in that, The spring piece includes a positioning hole I and a straight section I; a positioning hole I is arranged at the end of the spring piece; there is an inclination of 3° - 5° between the straight section where the positioning hole I is located and the straight section I.

10. The fixing device for the heat insulation module of a gas turbine combustor according to claim 9, characterized in that, The fixed section and the spring piece are arranged in a fitting manner; positioning holes are arranged on both the spring piece and the fixed section, and they are correspondingly matched with the positioning holes on the combustion chamber housing; the limiting section and the spring piece are of an integrally formed structure; the fixed section and the clamping section are of an integrally formed structure.

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