Combustion cases, engines and helicopters

Abstract

The present application relates to a combustion chamber casing, an engine and a helicopter, wherein the combustion chamber casing comprises an inner casing shell and an outer casing shell connected to each other, an installation cavity is formed in the inner casing shell, a first cavity is formed between the inner casing shell and the outer casing shell, a plurality of nozzle seats are installed in the first cavity, one end of the nozzle seat is connected to an oil inlet pipeline, the other end of the nozzle seat is connected to a nozzle, and the nozzle is located in the installation cavity. The combustion chamber casing of the present application is sealed as a whole, so that the parts except the connector and the external fuel pipeline are in the heat-insulating cavity formed by the outer casing shell and the inner casing shell, and are well protected by the inner and outer casings, which is conducive to preventing the invasion of external particulate matter and corrosive substances, and preventing the fuel pipeline and the nozzle seat from being hit by external sand and dust and corroded by corrosive substances.

Description

Technical Field

[0001] The present application relates to the technical field of aircraft engines and gas turbines, and in particular to a combustion chamber casing, an engine and a helicopter. Background Art

[0002] Small and micro aircraft engines and gas turbines have been hot topics of research at home and abroad in recent years. They have the advantages of small size, light weight, large output energy and high density. Among them, the design of the combustion chamber is a key link in the gas turbine engine. The combustion chamber components are mainly divided into combustion chamber heat shield, flame tube, fuel nozzle, fuel main pipe, combustion chamber casing and other components. In the traditional combustion chamber component design, the combustion chamber heat shield, fuel nozzle and fuel main pipe all adopt a split design. The combustion chamber heat shield mainly protects external accessories, cables and other pipelines from high temperature radiation. The fuel nozzle and fuel main pipe are mainly used to supply fuel to the interior of the combustion chamber. The combustion chamber casing seals the high temperature and high pressure gas inside the combustion chamber and constructs the internal air flow channel.

[0003] For the anti-sand and dust design of engine combustion chamber components, the materials of the combustion chamber heat insulation screen and external pipelines are currently mainly selected, and the anti-sand and dust ability of the engine combustion chamber components is improved by selecting reliable materials. Therefore, in the prior art, the anti-sand and dust ability of the engine combustion chamber components is mainly determined by the properties such as the strength of the combustion chamber heat insulation screen and external pipeline materials, resulting in low corrosion resistance and wind and sand resistance of the engine combustion chamber components. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a combustion chamber casing, an engine and a helicopter, which can improve the corrosion resistance and wind and sand resistance of the engine combustion chamber components.

[0005] On the one hand, the present application provides a combustion chamber casing, comprising an inner casing shell and an outer casing shell connected to each other, an installation cavity for accommodating a flame tube being formed in the inner casing shell, a first cavity being formed between the inner casing shell and the outer casing shell, a plurality of nozzle seats being installed in the first cavity, one end of the nozzle seat being connected to an oil inlet pipe, the other end of the nozzle seat being connected to a nozzle, the nozzle being located in the installation cavity, and one end of the nozzle located in the first cavity being connected to the oil inlet pipe.

[0006] In one embodiment of the present application, the inner casing and the outer casing are both cylindrical, the first cavity is formed between the bottom surface of the inner casing and the bottom surface of the outer casing, the second cavity is formed between the side surface of the inner casing and the side surface of the outer casing, and the first cavity and the second cavity are connected to form a heat-insulating cavity.

[0007] In one embodiment of the present application, the casing outer shell includes a plurality of sub-shells, and two adjacent sub-shells are spliced ​​together to form the casing outer shell.

[0008] In one embodiment of the present application, a first mounting hole is provided at the joint between two adjacent sub-shells, a mounting seat corresponding to the first mounting hole is provided on the inner shell of the receiver, a mounting column is provided on the sub-shell, a second mounting hole corresponding to the mounting column is provided on the inner shell of the receiver, the first mounting hole is connected to the mounting seat, and the mounting column is connected to the second mounting hole.

[0009] In one embodiment of the present application, a plurality of mounting seat holes are provided on the bottom surface of the inner shell of the casing, and the nozzle seat is installed in the mounting seat holes.

[0010] In one embodiment of the present application, the nozzle seat and the nozzle form an oil path that is interconnected, the nozzle is provided with a nozzle, and the oil paths in two adjacent nozzle seats are connected by an oil pipe, one of the oil pipes is a three-way pipe, and the end of the three-way pipe that is not connected to the nozzle seat is connected to a pipe joint, the pipe joint is installed on the casing outer shell, and the pipe joint is also connected to the oil inlet pipe.

[0011] In one embodiment of the present application, a positioning boss is provided in the nozzle seat, and an end surface of the nozzle away from the nozzle opening contacts the positioning boss.

[0012] In one embodiment of the present application, the heat insulation cavity is filled with heat insulation material.

[0013] On the other hand, an engine is provided, which is equipped with the above-mentioned combustion chamber casing.

[0014] On the other hand, a helicopter is provided, which is equipped with the above-mentioned engine.

[0015] The above combustion chamber casing technical solution of the present application has the following advantages compared with the prior art:

[0016] (1) In the present application, the entire combustion chamber casing is sealed as a whole. Except for the connectors and the external fuel pipeline, the remaining parts are in the insulation cavity formed by the casing outer shell and the casing inner shell, and are well protected by the inner and outer shells, which is beneficial to prevent the insulation material from being exposed, and prevent the invasion of external particles and corrosive substances, and prevent the fuel pipeline and the nozzle seat from being hit by external sand and dust and corroded by corrosive substances. At the same time, it can play a good insulation role, reduce material and processing costs, and extend the service life of the fuel main pipe and the fuel nozzle seat; and the arrangement of the casing inner shell and the casing outer shell further improves the fire protection capability.

[0017] (2) The outer casing of the casing in the present application is formed by splicing three sub-casings, which are overlapped by pressed edges, which facilitates disassembly and assembly, improves maintainability, reduces process difficulty, and saves costs.

[0018] (3) In the present application, the outer surface of the combustion chamber casing outer shell is designed to be a smooth surface and passivated, which enhances the corrosion resistance of the combustion chamber components, simplifies the process and reduces costs.

[0019] (4) The heat-insulating cavity is filled with heat-insulating materials, such as aerogel, high-silica fiber, etc., which are used to achieve heat insulation. It can play a good heat-insulating effect, protect the external components of the combustion chamber casing from high-temperature radiation, increase the material service life of external accessories, cables and other pipelines, improve engine safety, and increase the environmental adaptability of the engine; in addition, the fuel pipeline is wrapped in the heat-insulating cavity between the inner casing and the outer casing. Since it is filled with heat-insulating materials, if the fuel in the fuel pipeline leaks, the presence of the heat-insulating material can absorb the fuel, so that the fuel pipeline will not immediately leak into the engine compartment when it leaks. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a first structural schematic diagram of the combustion chamber casing of the present application;

[0022] Figure 2 is a second structural schematic diagram of the combustion chamber casing of the present application;

[0023] Figure 3 It is a schematic diagram of the explosion structure of the casing outer shell of the combustion chamber casing of the present application;

[0024] Figure 4 It is a schematic structural diagram of the combustion chamber casing of the present application without the casing outer shell;

[0025] Figure 5 is a cross-sectional view of the combustion chamber casing of the present application;

[0026] Figure 6 It is a structural schematic diagram of the nozzle and the nozzle seat of the combustion chamber casing of the present application;

[0027] Figure 7 is a cross-sectional view of the nozzle and the nozzle seat of the combustion chamber casing of the present application;

[0028] Figure 8It is a schematic diagram of the nozzle seat structure of the combustion chamber casing of the present application.

[0029] Description of the Figures in the Specification:

[0030] 1. Inner casing of casing; 2. Outer casing of casing; 3. Mounting cavity; 4. First cavity; 5. Nozzle; 6. Throttle hole; 7. Second cavity; 8. Insulation cavity; 9. Sub-casing; 10. First mounting hole; 11. Mounting seat; 12. Mounting column; 13. Second mounting hole; 14. Oil hole; 15. Nozzle seat; 16. Mounting seat hole; 17. Oil passage; 18. Nozzle; 19. Oil pipe; 20. Tee pipe; 21. Pipe joint; 22. Positioning boss; 23. First pressing edge; 24. Second pressing edge; 25. Third mounting hole. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] Embodiment 1

[0033] Reference Figures 1 to 8 As shown, the combustion chamber casing of the present application comprises an inner casing shell 1 and an outer casing shell 2 which are connected to each other, wherein an installation cavity 3 for accommodating a flame tube is formed in the inner casing shell 1, and a first cavity 4 is formed between the inner casing shell 1 and the outer casing shell 2, wherein a plurality of nozzle seats 15 are installed in the first cavity 4, wherein one end of the nozzle seat 15 is connected to an oil inlet pipeline, and the other end of the nozzle seat 15 is connected to a nozzle 5, and the nozzle 5 is located in the installation cavity 3.

[0034] The combustion chamber casing of the present application comprises a casing inner shell 1 and a casing outer shell 2, wherein a mounting cavity 3 is formed in the casing inner shell 1, and the mounting cavity 3 is used to mount a flame tube on the engine. The casing inner shell 1 and the casing outer shell 2 are connected to each other, and the casing outer shell 2 is sleeved on the outer edge of the casing inner shell 1, so that a first cavity 4 is formed between the casing inner shell 1 and the casing outer shell 2, and a plurality of nozzle seats 15 are installed in the first cavity 4, one end of the nozzle seat 15 is connected to the oil inlet pipeline, so that the oil inlet pipeline is supplied with oil through the nozzle seat 15, and the other end of the nozzle seat 15 is connected to a nozzle 5, and the nozzle 5 realizes spraying fuel into the flame tube installed in the mounting cavity 3, so that the fuel after spraying is ignited and organized to burn in the flame tube. Since the nozzle 5 realizes spraying fuel into the flame tube installed in the mounting cavity 3, the other end of the nozzle 5 needs to extend to the inside of the mounting cavity 3. The casing of the present application is connected in the form of inner and outer shells, and the casing outer shell 2 is used to effectively seal the internal parts, prevent sand and corrosive substances from entering the insulation cavity 8, and can protect the insulation materials and pipelines located in the insulation cavity 8 (including the first cavity 4), effectively improving the corrosion resistance and wind sand resistance of the engine combustion chamber parts, and the arrangement of the casing inner shell 1 and the casing outer shell 2 further improves the fireproof ability. In addition, the outer surface of the combustion chamber casing outer shell 2 is designed to be a smooth surface and passivated, which enhances the corrosion resistance of the combustion chamber parts, simplifies the process, and reduces costs.

[0035] In one embodiment, the inner casing 1 and the outer casing 2 are both cylindrical, and the first cavity 4 is formed between the bottom surface of the inner casing 1 and the bottom surface of the outer casing 2, and the second cavity 7 is formed between the side surface of the inner casing 1 and the side surface of the outer casing 2, and the first cavity 4 and the second cavity 7 are connected to form a heat-insulating cavity 8.

[0036] The inner casing 1 and the outer casing 2 are both cylindrical. Figure 1 and Figure 3 As shown, the casing inner shell 1 and the casing outer shell 2 are coaxially arranged, and the casing outer shell 2 is wrapped around the outer edge of the casing inner shell 1, so that a first cavity 4 is formed between the bottom surface of the casing inner shell 1 and the bottom surface of the casing outer shell 2, and a second cavity 7 is formed between the side surface (cylindrical side surface) of the casing inner shell 1 and the side surface (cylindrical side surface) of the casing outer shell 2, and the first cavity 4 and the second cavity 7 are connected to form a heat-insulating cavity 8. Except for necessary connectors and external fuel pipelines, the remaining parts and internal fuel pipelines are all in the heat-insulating cavity 8 between the casing outer shell 2 and the casing inner shell 1. The heat-insulating cavity 8 is used to protect the internal fuel pipeline and the nozzle seat 15 from external sand and dust impact and corrosion by corrosive substances, thereby reducing the processing cost and material cost of the fuel pipeline and the nozzle seat 15, and extending the service life of the fuel pipeline and the nozzle seat 15.

[0037] In one embodiment, the casing outer shell 2 includes a plurality of sub-shells 9 , and two adjacent sub-shells 9 are spliced ​​together to form the casing outer shell 2 .

[0038] The casing shell 2 includes a plurality of sub-shells 9, and two adjacent sub-shells 9 are spliced ​​together to form the casing shell 2. Specifically, the bottom of each sub-shell 9 is fan-shaped, and the side is arc-shaped, forming two side edges, and the outer side of one side edge (in the direction outward from the center of the fan-shaped circle) is provided with a depression to form a first pressing edge 23, and the inner side of the other side edge (in the direction inward from the center of the fan-shaped circle) is recessed to form a second pressing edge 24, so that when two adjacent sub-shells 9 are connected, the first pressing edge 23 of one sub-shell 9 is superimposed and connected with the second pressing edge 24 of the other sub-shell 9, thereby forming a complete cylindrical casing shell 2. Preferably, three sub-shells 9 are spliced ​​together to form a completed casing shell 2, and the mutual superposition of the pressing edges is conducive to disassembly and assembly, improves maintainability, reduces process difficulty, and saves costs.

[0039] In one embodiment, a first mounting hole 10 is provided at the joint between two adjacent sub-shells 9, a mounting seat 11 corresponding to the first mounting hole 10 is provided on the inner shell 1 of the casing, a mounting column 12 is provided on the sub-shell 9, a second mounting hole 13 corresponding to the mounting column 12 is provided on the inner shell 1 of the casing, the first mounting hole 10 is connected to the mounting seat 11, and the mounting column 12 is connected to the second mounting hole 13.

[0040] A first mounting hole 10 is provided at the joint between two adjacent sub-shells 9. Figure 3As shown, the joint is formed by overlapping and splicing the first pressing edge 23 and the second pressing edge 24, so the first pressing edge 23 and the second pressing edge 24 are both provided with corresponding first mounting holes 10. When installing, the first mounting holes 10 of the first pressing edge 23 and the second pressing edge 24 are aligned, and a mounting seat 11 corresponding to the first mounting hole 10 is provided on the inner shell 1 of the receiver. When installing, the first mounting hole 10 aligned with the first pressing edge 23 and the second pressing edge 24 is aligned with the mounting seat 11, and then the first mounting hole 10 (including the first mounting hole 10 on the first pressing edge 23 and the second pressing edge 24) is connected to the mounting seat 11. Bolt connection or welding can be used to splice and connect the two sub-shells 9 to the inner shell 1 of the receiver. A mounting post 12 is provided on the sub-shell 9, and the mounting post 12 is arranged at the top edge of the inner shell 1 of the casing (the fully open end of the cylindrical inner shell 1 and the outer shell 2 of the casing is called the top, and the end with the bottom surface is called the bottom). A second mounting hole 13 corresponding to the mounting post 12 is provided on the inner shell 1 of the casing, and the second mounting hole 13 is provided at the top edge of the inner shell 1 of the casing. The mounting post 12 is aligned with and connected to the second mounting hole 13, and bolt connection or welding can be adopted to connect the sub-shell 9 and the inner shell 1 of the casing to each other. Furthermore, a third mounting hole 25 can be provided on the mounting post 12, and the connection between the sub-shell 9 and the inner shell 1 of the casing is realized by connecting the second mounting hole 13 with the third mounting hole 25. The casing inner shell 1 is connected to the casing outer shell 2 in the above manner to form an insulating cavity 8. The casing outer shell 2 ensures that the internal fuel pipeline, nozzle seat 15 and other components are not impacted by external sand and dust and corroded by corrosive substances. The insulating cavity 8 has a good thermal insulation effect, reduces material and processing costs, and extends the service life of the fuel main pipe and the fuel nozzle seat 15.

[0041] In one embodiment, a plurality of mounting seat holes 16 are provided on the bottom surface of the casing inner shell 1 , and the nozzle seat 15 is installed in the mounting seat holes 16 .

[0042] The nozzle 5 is used to atomize the fuel and spray it into the flame tube. A plurality of mounting holes 16 are provided on the bottom surface of the casing inner shell 1. The mounting holes 16 are used to install the nozzle seat 15. When the nozzle seat 15 is installed in the mounting hole 16 on the casing inner shell 1, the nozzle 5 connected to the nozzle seat 15 is located in the installation cavity 3. When the nozzle seat 15 is supplied with fuel, the fuel is sprayed into the flame tube in the installation cavity 3 through the nozzle 5. Specifically, the mounting holes 16 are arranged in a circular array around the axis of the casing inner shell 1 on the bottom surface of the casing inner shell 1.

[0043] In one embodiment, the nozzle seat 15 and the nozzle 5 form an oil passage 17 that is interconnected, and a nozzle 18 is provided on the nozzle 5. The oil passages 17 in two adjacent nozzle seats 15 are connected through an oil pipe 19, one of the oil pipes 19 is a three-way pipe 20, and the end of the three-way pipe 20 that is not connected to the nozzle seat 15 is connected to a pipe joint 21, and the pipe joint 21 is installed on the casing outer shell 2, and the pipe joint 21 is also connected to the oil inlet pipe.

[0044] The nozzle seat 15 and the nozzle 5 form an oil passage 17 that communicates with each other. Figure 7 The nozzle 5 is provided with a nozzle 18. When the fuel reaches the nozzle 18 through the oil passage, it will be sprayed into the flame tube in the installation cavity 3 through the nozzle 18. The oil passages 17 in two adjacent nozzle seats 15 are connected by an oil pipe 19. Figure 4 As shown, two adjacent nozzle seats 15 arranged in a circular array are connected by an oil pipe 19 and an oil hole 14, and the oil passages 17 on the two adjacent nozzle seats 15 are connected by the oil pipe 19 and the oil hole 14. Specifically, the oil pipe 19 is a fuel hard pipe to improve the stability of fuel flow. There is an oil pipe 19 between two adjacent nozzle seats 15, such as Figure 4 The combustion chamber casing shown includes six nozzle seats 15 and six oil pipes 19. Among the six oil pipes 19, one of the oil pipes 19 is a tee pipe 20. The end of the tee pipe 20 that is not connected to the nozzle seat 15 is connected to a pipe joint 21. The pipe joint 21 is installed on the casing outer shell 2. The oil pipe 19 is fixed to the casing outer shell 2 by bolts on the pipe joint 21. The pipe joint 21 is also connected to the oil inlet pipeline to realize oil supply through the oil inlet pipeline. Further, the nozzle 5 is as shown in FIG. Figure 7 As shown, a throttle hole 6 is provided inside the nozzle 5. The fuel first flows in from the oil inlet pipe and then enters the nozzle seat 15 connected to the tee pipe 20 through the tee pipe 20, and then flows into the adjacent nozzle seat 15 through the oil pipe 19 in turn, and further flows to the nozzle 5. After passing through the throttle hole 6 in the nozzle 5, the fuel pressure drops, the flow rate increases, the density decreases, and part of the fuel is atomized. The part of the atomized fuel is further atomized through the nozzle 18 and sprayed into the flame tube in the installation cavity 3 to be ignited and burned.

[0045] In one embodiment, a positioning boss 22 is disposed in the nozzle seat 15 , and an end surface of the nozzle 5 away from the nozzle opening 18 contacts the positioning boss 22 .

[0046] In order to facilitate the installation and positioning of the nozzle 5 on the nozzle seat 15, a positioning boss 22 is provided inside the nozzle seat 15. When the nozzle 5 is installed on the nozzle seat 15, the end surface of the nozzle 5 away from the nozzle opening 18 contacts the positioning boss 22, so that the nozzle 5 is limitedly installed by the positioning boss 22.

[0047] In one embodiment, the insulation cavity 8 is filled with insulation material.

[0048] The heat insulation cavity 8 is filled with heat insulation materials, such as aerogel, high silica fiber, etc., which are used to achieve heat insulation, and can play a good heat insulation effect, can protect the external components of the combustion chamber casing from high temperature radiation, increase the material service life of external accessories, cables and other pipelines, improve engine safety, and increase engine environmental adaptability. In addition, the fuel pipeline is wrapped in the heat insulation cavity 8 between the casing inner shell 1 and the casing outer shell 2. Since it is filled with heat insulation materials, if the fuel in the fuel pipeline leaks, the presence of the heat insulation material can absorb the fuel, so that the fuel pipeline will not leak immediately into the engine compartment.

[0049] The specific flow process of fuel is as follows:

[0050] like Figure 4 and Figure 7 As shown, the fuel first flows from the oil inlet pipe through the pipe joint 21 into the tee pipe 20, and then flows into the nozzle seat 15 connected to the tee pipe 20 through the tee pipe 20. The oil inlet pipe continuously supplies oil to the nozzle seat 15, so that the fuel enters each nozzle seat 15 through the oil pipe 19. The fuel entering the nozzle seat 15 first passes through the throttle hole 6 in the nozzle 5, the fuel pressure drops, the flow rate increases, the density decreases, and part of the fuel is atomized. The partially atomized fuel is further atomized through the nozzle 18 and sprayed into the flame tube in the installation cavity 3 to organize combustion after ignition.

[0051] Embodiment 2

[0052] An engine is provided with the combustion chamber casing of the first embodiment. The engine using the combustion chamber casing of the first embodiment can effectively improve the anti-dust and anti-corrosion capabilities of the engine on the basis of improving the anti-dust and anti-corrosion capabilities of the combustion chamber casing, thereby extending the service life of the engine.

[0053] Embodiment 3

[0054] A helicopter is provided with the engine of the second embodiment. The helicopter using the engine of the second embodiment can effectively reduce the material cost of the helicopter on the basis of improving the dust resistance and corrosion resistance of the combustion chamber casing.

[0055] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A combustion chamber casing, Features: The invention comprises an inner casing shell (1) and an outer casing shell (2) which are connected to each other, wherein an installation cavity (3) for accommodating a flame tube is formed in the inner casing shell (1), and a plurality of nozzle seats (15) are installed in a first cavity (4), wherein one end of the nozzle seat (15) is connected to an oil inlet pipeline, and the other end of the nozzle seat (15) is connected to a nozzle (5), and the nozzle (5) is located in the installation cavity (3); wherein the first cavity (4) is formed between the bottom surface of the inner casing shell (1) and the bottom surface of the outer casing shell (2), and a second cavity (7) is formed between the side surface of the inner casing shell (1) and the side surface of the outer casing shell (2), and the first cavity (4) and the second cavity (7) are connected to form a heat insulation cavity (8); the combustion chamber casing is connected in the form of the inner casing shell (1) and the outer casing shell (2), and the internal parts thereof are sealed by the outer casing shell (2).

2. The combustion chamber casing according to claim 1, Features: The inner casing (1) and the outer casing (2) are both cylindrical.

3. The combustion chamber casing according to claim 2, Features: The casing outer shell (2) comprises a plurality of sub-shells (9), and two adjacent sub-shells (9) are spliced ​​together to form the casing outer shell (2).

4. The combustion chamber casing according to claim 3, Features: A first mounting hole (10) is provided at a joint between two adjacent sub-shells (9); a mounting seat (11) corresponding to the first mounting hole (10) is provided on the inner shell (1) of the casing; a mounting column (12) is provided on the sub-shell (9); a second mounting hole (13) corresponding to the mounting column (12) is provided on the inner shell (1) of the casing; the first mounting hole (10) is connected to the mounting seat (11); and the mounting column (12) is connected to the second mounting hole (13).

5. The combustion chamber casing according to claim 2, Features: A plurality of mounting seat holes (16) are arranged on the bottom surface of the casing inner shell (1), and the nozzle seat (15) is mounted in the mounting seat holes (16).

6. The combustion chamber casing according to claim 5, Features: The nozzle seat (15) and the nozzle (5) form an oil passage (17) that is in communication with each other. The nozzle (5) is provided with a nozzle (18). The oil passages (17) in two adjacent nozzle seats (15) are communicated with each other through an oil pipe (19). One of the oil pipes (19) is a three-way pipe (20). An end of the three-way pipe (20) that is not connected to the nozzle seat (15) is connected with a pipe joint (21). The pipe joint (21) is mounted on the casing outer shell (2). The pipe joint (21) is also communicated with the oil inlet pipe.

7. The combustion chamber casing according to claim 6, Features: A positioning boss (22) is provided in the nozzle seat (15), and the end surface of the nozzle (5) away from the nozzle opening (18) is in contact with the positioning boss (22).

8. The combustion chamber casing according to claim 2, Features: The heat insulation cavity (8) is filled with heat insulation material.

9. An engine comprising a combustion chamber casing as claimed in any one of claims 1 to 8.

10. A helicopter comprising the engine according to claim 9.

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