A detachable turbine engine combustion chamber liner

Abstract

The utility model relates to turbine engine bush technology field especially, it is a detachable turbine engine combustion chamber bush, it includes outer bush and inner bush, the outer bush includes first bush body, connecting lug, fastening bolt, second bush body, connecting through -hole, fastening nut and nest groove, both sides of the butt joint of first bush body and second bush body all are solid and are equipped with connecting lug, the connecting lug surface screw thread connection of first bush body both sides has fastening bolt, the connecting lug surface both sides of second bush body and fastening bolt corresponding position all are equipped with connecting through -hole. Compared with traditional integral bush structure, the utility model realizes high -efficient heat isolation, improves heat -insulating effect and service life, can realize quick dismount simultaneously, reduces bush dismounting difficulty, improves bush's assembly and maintenance efficiency, is helpful for reducing maintenance cost, improves bush's practicality.

Description

Technical Field

[0001] This utility model relates to a turbine engine combustion chamber bushing, and more particularly to a detachable turbine engine combustion chamber bushing, belonging to the technical field of turbine engine bushings. Background Technology

[0002] A turbine engine is a power device that uses rotating turbine blades to convert the energy of high-temperature, high-pressure combustion gases generated by fuel combustion into mechanical energy, thereby driving equipment such as generator sets.

[0003] The combustion chamber bushing of a turbine engine is a thermal protection component installed inside the combustion chamber of a turbine engine. It is usually made of high-temperature resistant materials and ensures the safe and stable operation of the combustion chamber through its own structure and cooling system.

[0004] Traditional turbine engine combustion chamber bushings are mostly integral structures. After long-term exposure to high-temperature combustion gas scouring, thermal shock, and mechanical vibration, they are prone to localized damage. When damaged, they must be replaced as a whole, resulting in high maintenance costs and low efficiency. Existing technologies also include detachable bushings, which are convenient to replace. However, in actual use, they usually rely on the inherent heat insulation properties of the bushing itself to achieve heat insulation. This leads to insufficient actual heat insulation performance during use, and heat can still be continuously transferred outward through the bushing itself, causing the temperature of the outer bushing and combustion chamber shell to rise, reducing the performance and service life of the turbine engine. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a detachable turbine engine combustion chamber bushing to solve the aforementioned technical problems in the prior art.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: A detachable turbine engine combustion chamber bushing includes an outer bushing and an inner bushing. The outer bushing includes a first bushing body, connecting lugs, fastening bolts, a second bushing body, connecting through holes, fastening nuts, and nesting grooves. Connecting lugs are fixed on both sides of the joint between the first bushing body and the second bushing body. Connecting through holes are provided on the connecting lugs at the joint between the first bushing body and the second bushing body. The first bushing body and the second bushing body are connected by fastening nuts and fastening bolts that pass through the connecting through holes. Nesting grooves are provided on the inner sides of both the first bushing body and the second bushing body. A heat insulation layer is detachably connected to the inner sidewall of the nesting groove.

[0007] Furthermore, the inner liner includes an inner liner body, a metal sealing gasket, and a snap-fit ​​protrusion. The upper and lower ends of the surface of the inner liner body are fixedly connected with snap-fit ​​protrusions. The snap-fit ​​protrusions abut against the bottom end and bottom end of the inner cavity of the nesting groove, respectively. A metal sealing gasket is detachably provided at the abutment point between the snap-fit ​​protrusion and the nesting groove.

[0008] Furthermore, the inner liner is made of nickel-based single-crystal alloy material, and the outer wall of the inner liner is coated with a thermal barrier coating.

[0009] Furthermore, the inner liner surface is provided with air film pores.

[0010] Furthermore, the air film pores are multiple and evenly distributed on the surface of the inner liner.

[0011] Furthermore, elastic pads are nested in the inner walls of the first bushing and the second bushing at the locations corresponding to the snap-fit ​​protrusions, and the inner side of the elastic pads abuts against the outer wall of the snap-fit ​​protrusions.

[0012] Furthermore, a drainage hole is provided at the bottom end of the nesting groove inside the first bushing body and the second bushing body.

[0013] Furthermore, the insulation layer is made of ceramic fiber felt, and the outer layer of the insulation layer is wrapped with metal foil to prevent the fibers from falling off.

[0014] Compared with the prior art, this utility model has at least the following beneficial effects: This application incorporates a thermal insulation layer made of ceramic fiber felt between the inner and outer bushings. Combined with a thermal barrier coating on the surface of the inner bushing and an elastic pad within the nested groove of the outer bushing, the thermal insulation layer reduces heat transfer from the inner bushing to the outside, while the elastic pad provides thermal expansion space for the inner bushing. This reduces the operating temperature of the outer bushing to minimize thermal damage and prevents the inner bushing from cracking due to thermal stress concentration. As a result, the engine combustion chamber bushing can withstand thermal shock and mechanical vibration, effectively improving the overall thermal insulation performance and service life of the bushing.

[0015] This application utilizes a first and second bushing body that can be spliced ​​together as an outer bushing, and is fixed with connecting ears and fastening bolts to create a detachable fixing structure. Meanwhile, the inner bushing achieves quick assembly and disassembly through a snap-fit ​​protrusion and a nested groove in the outer bushing, reducing the difficulty of bushing assembly disassembly and assembly and effectively improving disassembly and assembly efficiency. When the inner bushing or insulation layer is partially damaged, the corresponding sector segment can be disassembled and replaced separately without overall disassembly. This not only significantly shortens maintenance time and improves maintenance efficiency, but also effectively reduces maintenance costs and enhances the practicality of the bushing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a structural schematic diagram showing the overall disassembled view of this utility model; Figure 3 This is a structural schematic diagram of the outer shell of this utility model after being disassembled; Figure 4 This is a structural schematic diagram of the overall vertical sectional view of this utility model.

[0017] In the picture: 1. Outer liner; 2. Inner liner; 3. Thermal insulation layer; 4. Elastic pad; 5. Drainage hole; 1. Outer sleeve: 101. First bushing body; 102. Connecting lug; 103. Fastening bolt; 104. Second bushing body; 105. Threaded connection hole; 106. Fastening nut; 107. Nesting groove; 2. Inner liner: 201. Inner liner body; 202. Metal gasket; 203. Snap-fit ​​protrusion; 204. Air film hole. Detailed Implementation

[0018] The technical solution of this utility model will now be clearly and completely described in conjunction with the accompanying drawings and specific embodiments.

[0019] like Figures 1 to 4 As shown, a detachable turbine engine combustion chamber bushing includes an outer bushing 1 and an inner bushing 2. The outer bushing 1 comprises a first bushing body 101, connecting ears 102, fastening bolts 103, a second bushing body 104, a connecting through hole 105, a fastening nut 106, and a nesting groove 107. Connecting ears 102 are fixed on both sides of the joint between the first bushing body 101 and the second bushing body 104. A connecting through hole 105 is provided on the connecting ears 102 at the joint between the first bushing body 101 and the second bushing body 104. The first bushing body 101 and the second bushing body 104 are connected by the fastening nut 106 and the fastening bolt 103 passing through the connecting through hole 105. A nesting groove 107 is provided on the inner side of both the first bushing body 101 and the second bushing body 104. A heat insulation layer 3 is detachably connected to the inner wall of the nesting groove 107. The cross-section of the first bushing body 101 and the second bushing body 104 is a semi-circular structure.

[0020] The inner liner 2 includes an inner liner body 201, a metal sealing gasket 202, and a snap-fit ​​protrusion 203. The upper and lower ends of the inner liner body 201 are fixedly connected to the snap-fit ​​protrusion 203, and the inner liner body 201 is snapped into the inner cavity of the nesting groove 107 inside the outer liner 1 via a snap-fit ​​connection. The snap-fit ​​protrusion 203 abuts against the bottom end and bottom end of the inner cavity of the nesting groove 107, respectively. A metal sealing gasket 202 is detachably provided at the abutment point between the snap-fit ​​protrusion 203 and the nesting groove 107. The surface of the inner liner 2... Multiple sets of evenly distributed air film holes 204 are provided; the inner bushing 2 achieves quick positioning and installation through the cooperation of the snap-fit ​​protrusion 203 and the nesting groove 107 of the outer bushing 1. With the metal sealing gasket 202 at the contact point between the snap-fit ​​protrusion 203 and the nesting groove 107, the sealing of the connection between the inner and outer bushings 1 can be guaranteed to prevent gas leakage. At the same time, the multiple sets of air film holes 204 can introduce cooling airflow to form a protective air film. Meanwhile, the snap-fit ​​structure facilitates the individual disassembly and assembly of the inner bushing 2, effectively improving the convenience of bushing maintenance.

[0021] The inner bushing 2 is made of nickel-based single-crystal alloy and has a thermal barrier coating on its outer wall. Elastic pads 4 are nested on the inner walls of the first bushing body 101 and the second bushing body 104 at locations corresponding to the snap-fit ​​protrusion 203, with the inner side of the elastic pads 4 abutting against the outer wall of the snap-fit ​​protrusion 203. Drainage holes 5 are provided at the bottom of the nesting grooves 107 inside the first bushing body 101 and the second bushing body 104. The inner bushing 2 is made of nickel-based single-crystal alloy and coated with a thermal barrier coating. Preferably, the thermal barrier coating is a multi-layered coating with zirconium oxide or other ceramic materials as its core, applied to the surface of high-temperature components, providing thermal insulation, thermal shock resistance, and... Anti-oxidation and corrosion reduction lowers the substrate temperature and improves the durability of components in extreme high-temperature environments; this technology is existing. Thanks to the alloy's excellent high-temperature resistance and the coating's thermal insulation protection, the inner bushing 2's resistance to high-temperature combustion gases is significantly improved. The elastic pads 4 corresponding to the snap-fit ​​protrusions 203 on the inner walls of the first bushing body 101 and the second bushing body 104 provide a flexible buffer space for the thermal expansion of the inner bushing 2 to avoid thermal stress concentration. The drain hole 5 at the bottom of the nesting groove 107 can promptly drain condensate, preventing moisture accumulation from affecting the performance of the insulation layer 3, effectively ensuring the stable operation and service life of the bushing under complex working conditions, and ensuring the practical effect of the bushing.

[0022] Among them, the heat insulation layer 3 is made of ceramic fiber felt, and the outer layer of the heat insulation layer 3 is wrapped with metal foil to prevent fiber shedding; the heat insulation layer 3 is made of ceramic fiber felt and wrapped with metal foil on the outside, which can reduce the heat transfer from the inner liner 2 to the outside through the high-efficiency heat insulation performance of ceramic fiber felt, and can also effectively prevent ceramic fibers from falling off under the scouring or vibration environment of high-temperature gas, avoid fiber fragments entering the gas passage and affecting the safe operation of the engine, and at the same time ensure the long-term stable heat insulation effect of the heat insulation layer 3.

[0023] Working principle: When using the bushing, firstly, the ceramic fiber felt insulation layer 3 wrapped with metal foil is laid in the nesting groove 107 of the first bushing body 101 and the second bushing body 104 of the outer bushing 1. Then, the inner bushing 2 with thermal barrier coating is inserted into the outer bushing 1 through the engagement of the snap-fit ​​protrusion 203 and the nesting groove 107, so that the metal sealing gasket 202 at the contact point between the snap-fit ​​protrusion 203 and the nesting groove 107 is tightly fitted. Finally, the first bushing body 101 and the second bushing body 104 are spliced ​​and fixed by the connecting lug 102, the fastening bolt 103 and the fastening nut 106. Once assembled, the entire assembly is completed and then mounted onto the turbine engine. During engine operation, the air film holes 204 on the surface of the inner bushing 2 introduce cooling airflow to form a protective air film. Combined with the heat insulation effect of the insulation layer 3 and the buffering effect of the elastic pad 4 on thermal expansion, a highly efficient heat insulation effect is achieved. When maintenance is required, the outer bushing 1 can be disassembled by loosening the fastening bolts 103, and the damaged inner bushing 2 or insulation layer 3 can be removed and replaced separately. After replacement, it can be reassembled and fixed according to the assembly steps. The operation is simple, effectively reducing the difficulty of later maintenance and repair and improving the convenience of maintenance.

[0024] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and refinements can be made without departing from the principle of the present utility model, and these modifications and refinements should also be considered within the protection scope of the present utility model.

Claims

1. A detachable turbine engine combustion chamber bushing, comprising an outer bushing (1) and an inner bushing (2), characterized in that: The outer bushing (1) includes a first bushing body (101), a connecting lug (102), a fastening bolt (103), a second bushing body (104), a connecting through hole (105), a fastening nut (106), and a nesting groove (107). The first bushing body (101) and the second bushing body (104) are both fixedly provided with connecting lugs (102) at the joint. The connecting lugs (102) at the joint of the first bushing body (101) and the second bushing body (104) are provided with connecting through holes (105). The first bushing body (101) and the second bushing body (104) are connected by fastening nuts (106) and fastening bolts (103) that pass through the connecting through holes (105). The inner sides of the first bushing body (101) and the second bushing body (104) are both provided with nesting grooves (107). The inner sidewall of the nesting groove (107) is detachably connected with a heat insulation layer (3).

2. The detachable turbine engine combustion chamber bushing according to claim 1, characterized in that: The inner liner (2) includes an inner liner body (201), a metal sealing gasket (202), and a snap-fit ​​protrusion (203). The upper and lower ends of the surface of the inner liner body (201) are fixedly connected with snap-fit ​​protrusions (203). The snap-fit ​​protrusions (203) abut against the bottom end and bottom end of the inner cavity of the nesting groove (107) respectively. The metal sealing gasket (202) is detachably provided at the abutment of the snap-fit ​​protrusions (203) and the nesting groove (107).

3. The detachable turbine engine combustion chamber bushing according to claim 2, characterized in that: The inner liner (2) is made of nickel-based single crystal alloy material, and the outer wall of the inner liner (2) is coated with a thermal barrier coating.

4. The detachable turbine engine combustion chamber bushing according to claim 3, characterized in that: The inner liner (2) has air film holes (204) on its surface.

5. The detachable turbine engine combustion chamber bushing according to claim 4, characterized in that: There are multiple air film pores (204), which are evenly distributed on the surface of the inner liner (2).

6. The detachable turbine engine combustion chamber bushing according to claim 2, characterized in that: The inner walls of the first bushing body (101) and the second bushing body (104) are each provided with an elastic pad (4) corresponding to the snap-fit ​​protrusion (203), and the inner side of the elastic pad (4) abuts against the outer side wall of the snap-fit ​​protrusion (203).

7. The detachable turbine engine combustion chamber bushing according to claim 1, characterized in that: Drainage holes (5) are provided at the bottom of the nesting groove (107) inside the first bushing body (101) and the second bushing body (104).

8. The detachable turbine engine combustion chamber bushing according to claim 1, characterized in that: The insulation layer (3) is made of ceramic fiber felt, and the outer layer of the insulation layer (3) is wrapped with metal foil.

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