A combustion chamber

Abstract

The present invention discloses a combustion chamber, including a combustion chamber casing, a flame tube and a fixing part, wherein the flame tube is arranged in the combustion chamber casing, and the fixing part has a first annular structure fixedly connected to the end of the combustion chamber casing, and a second annular structure fixedly connected to the flame tube, wherein the first annular structure and the second annular structure are connected via a tubular part. Since the first annular structure is fixedly connected to the end of the combustion chamber casing, that is, the first annular structure can be fixed to the end of the combustion chamber casing by screws, and a locking plate is arranged between the screw and the end of the combustion chamber casing, when the locking fails, the locking plate falls outside the combustion chamber casing and does not enter the interior of the engine, thereby avoiding damage caused by the locking plate falling inside the engine. And since the locking plate and the screw are installed outside the combustion chamber casing, it is convenient for the inspector to promptly discover the failure and replace it in time. This makes the combustion chamber easy to install and maintain.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft engines, and in particular to a combustion chamber. Background Art

[0002] The combustion chamber is the core component of the engine. It is also the place where the engine undergoes violent chemical reactions. Its interior involves complex turbulent flow, fuel atomization and combustion. With the development of aviation engine technology, the operating temperature of the combustion chamber has gradually increased. On the basis of meeting the requirements of weight, reliability, life, etc., the temperature resistance of the combustion chamber has also been further improved.

[0003] The existing combustion chamber includes a combustion chamber casing, a gas turbine guide, a flame tube, and an oil flinging plate. The flame tube is arranged in the combustion chamber casing. The gas turbine guide part extends into the combustion chamber casing. The oil flinging plate is arranged in the flame tube and is used to provide oil mist into the flame tube. The flame tube is divided into a flame tube outer body and a flame tube inner body. The flame tube outer body wraps the flame tube inner body. The flame tube outer body is fixed to the gas turbine guide by screws, and the screws are prevented from loosening by locking plates.

[0004] However, the above combustion chamber has a problem of locking failure due to the fact that the installation process of the locking plate is affected by human factors, which in turn causes the screws and the locking plate to fall into the engine, causing damage to the engine. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is that since the installation process of the locking plate is affected by human factors, there is a problem of locking failure, which in turn causes the screws and locking plates to fall into the engine, causing engine damage.

[0006] To this end, the present invention provides a combustion chamber, comprising:

[0007] Combustion chamber casing;

[0008] A flame tube, wherein the flame tube is arranged in the combustion chamber casing;

[0009] The fixing part comprises a first circular ring structure fixedly connected to the end of the combustion chamber casing and a second circular ring structure fixedly connected to the flame tube, wherein the first circular ring structure and the second circular ring structure are connected via a cylindrical part.

[0010] Optionally, in the above-mentioned combustion chamber, the inner diameter of the first circular ring structure is greater than the inner diameter of the second circular ring structure.

[0011] Optionally, in the above-mentioned combustion chamber, a plurality of cooling holes are provided on the second annular structure.

[0012] Optionally, the above combustion chamber further includes:

[0013] a first stopper, the first stopper being arranged at one side of the first circular ring structure, and the first stopper being suitable for being engaged with a turbine casing;

[0014] A second stopper is provided on the other side of the first circular ring structure, and the second stopper is suitable for being engaged with the combustion chamber casing.

[0015] Optionally, in the above combustion chamber, the flame tube comprises:

[0016] A flame tube body, wherein the flame tube body is fixedly connected to the second circular ring structure;

[0017] A wave ring, wherein the wave ring has a plurality of convex surfaces and a plurality of concave surfaces, wherein the plurality of convex surfaces and the plurality of concave surfaces are spaced apart from each other and evenly distributed on the wave ring, wherein the convex surface is fixedly connected to the flame tube body, and a first air inlet passage is formed between the concave surface and the flame tube body.

[0018] Optionally, in the above combustion chamber, the flame tube further comprises:

[0019] A front ring, the front ring is fixedly connected to the wave-shaped ring;

[0020] A positioning ring, one side of which is fixedly connected to the front ring, and the other side of which is plugged into the inner wall of the combustion chamber casing, and a plurality of jet holes are provided on the positioning ring, and the jet holes are suitable for introducing compressed air.

[0021] Optionally, in the above-mentioned combustion chamber, the flame tube body comprises:

[0022] A first outer ring, wherein the first outer ring is fixedly connected to the corrugated ring;

[0023] a second outer ring, one side of the second outer ring being fixedly connected to a side of the first outer ring away from the corrugated ring, the other side of the second outer ring being fixedly connected to the second circular ring structure via an outer connecting ring, and a second air inlet passage being arranged on the second outer ring;

[0024] The first outer ring, the second outer ring and the outer connecting ring enclose a combustion cavity.

[0025] Optionally, in the above-mentioned combustion chamber, the flame tube body also includes a flame tube inner body, the flame tube inner body is arranged in the combustion cavity, and a third air intake passage is provided on the flame tube inner body, and a plurality of rectangular grooves are opened on the outer wall of the tubular member, and the rectangular grooves are connected to the third air intake passage.

[0026] Optionally, the above combustion chamber further includes:

[0027] A bushing mounting seat, wherein the bushing mounting seat is fixedly connected to the outer side wall of the flame tube body;

[0028] A movable bushing is connected to the bushing mounting seat, and the movable bushing is suitable for inserting the electric nozzle.

[0029] Optionally, in the above-mentioned combustion chamber, a compressed air flow channel is formed between the flame tube and the combustion chamber casing.

[0030] The technical solution provided by the present invention has the following advantages:

[0031] 1. The combustion chamber provided by the present invention comprises a combustion chamber casing, a flame tube and a fixing part, wherein the flame tube is arranged in the combustion chamber casing, and the fixing part comprises a first circular ring structure fixedly connected to the end of the combustion chamber casing, and a second circular ring structure fixedly connected to the flame tube, and the first circular ring structure and the second circular ring structure are connected via a tubular part.

[0032] The combustion chamber of this structure has a first annular structure fixedly connected to the end of the combustion chamber casing, that is, the first annular structure can be fixed to the end of the combustion chamber casing by screws, and the locking piece is arranged between the screws and the end of the combustion chamber casing. When the locking fails, the locking piece falls outside the combustion chamber casing and does not enter the interior of the engine, thereby avoiding the damage caused by the locking piece falling inside the engine. And because the locking piece and the screw are installed outside the combustion chamber casing, it is convenient for the inspector to promptly discover the failure and replace it in time. This makes the combustion chamber easy to install and maintain.

[0033] 2. The combustion chamber provided by the present invention has a first stopper provided on the first annular structure, and the flame tube is fixedly connected to the second annular structure. The flame tube can position the turbine casing through the first stopper, so that the turbine casing and the flame tube are precisely matched. The first annular structure is provided with a second stopper, and the flame tube can be precisely positioned with the combustion chamber casing through the second stopper, so that the combustion chamber casing and the flame tube are precisely matched. The flame tube is precisely matched with the combustion chamber casing and the turbine casing respectively, which is beneficial to the stability of the combustion chamber performance; the flame tube is plugged into the inner wall of the combustion chamber casing through a positioning ring, and the side of the flame tube away from the positioning ring is fixedly connected to the end of the combustion chamber casing through the first annular structure, so that both sides of the flame tube are fixedly connected to the combustion chamber casing, which optimizes the stress condition of the flame tube and improves the problem of large thermal deformation of thin-walled flame tubes fixed on one side and the resulting performance deterioration.

[0034] 3. The combustion chamber provided by the present invention has a plurality of concave surfaces and convex surfaces, and the plurality of concave surfaces and the plurality of convex surfaces are evenly spaced and distributed. The corrugated ring is fixedly connected to the flame tube body, and a plurality of first air inlet channels are formed between the convex surface of the corrugated ring and the flame tube body. The plurality of first air inlet channels are distributed along the circumferential direction of the corrugated ring, i.e., an annular air inlet structure. The corrugated ring annular air inlet structure can form a wall-attached air film with a large penetration depth in the circumferential direction of the flame tube, thereby realizing efficient cooling of the flame tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A partial cross-sectional view of a combustion chamber in the present invention;

[0037] Figure 2 A partial cross-sectional view of the flame tube and the fixing member provided by the present invention;

[0038] Figure 3 for Figure 2 A partial enlarged schematic diagram of the middle circle A;

[0039] Figure 4 A schematic diagram of a corrugated ring provided for a combustion chamber in the present invention;

[0040] Figure 5 It is a schematic diagram of the structure of the flame tube and the fixing member in the present invention;

[0041] Figure 6 It is a schematic diagram showing another perspective of the cooperation between the flame tube and the fixing member in the present invention.

[0042] Description of reference numerals:

[0043] 1. Combustion chamber casing;

[0044] 2. Flame tube; 211. First outer ring; 212. Second outer ring; 2121. Second air inlet passage; 213. External connecting ring; 214. Flame tube inner body; 2141. Third air inlet passage; 22. Wave ring; 221. Convex surface; 222. Concave surface; 23. Front ring; 24. Positioning ring; 25. Combustion cavity;

[0045] 3. Fixing member; 31. First circular ring structure; 311. First stopper; 312. Second stopper; 32. Second circular ring structure; 321. Cooling hole; 33. Rectangular groove;

[0046] 4. Compressed air flow channel;

[0047] 51. Bushing mounting seat; 52. Movable bushing;

[0048] 6. Gas turbine shaft;

[0049] 7. Oil throw tray;

[0050] 8. Turbine casing;

[0051] 9. Combustion guide hollow blades. DETAILED DESCRIPTION

[0052] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0054] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0056] Example 1

[0057] This embodiment provides a combustion chamber, such as Figures 1 to 6 As shown, it includes a combustion chamber casing 1, a flame tube 2 and a fixing part 3. The flame tube 2 is arranged in the combustion chamber casing 1. The fixing part 3 has a first circular ring structure 31 fixedly connected to the end of the combustion chamber casing 1, and a second circular ring structure 32 fixedly connected to the flame tube 2. The first circular ring structure 31 and the second circular ring structure 32 are connected via a tubular part.

[0058] The combustion chamber provided in this embodiment has the first annular structure 31 fixedly connected to the end of the combustion chamber casing 1, that is, the first annular structure 31 can be fixed to the end of the combustion chamber casing 1 by screws, and the locking plate is arranged between the screws and the end of the combustion chamber casing 1. When the locking fails, the locking plate falls outside the combustion chamber casing 1 and does not enter the interior of the engine, thereby avoiding the damage caused by the locking plate falling inside the engine. And because the locking plate and the screws are installed outside the combustion chamber casing 1, it is convenient for the inspectors to find the failure in time and replace it in time. This makes the combustion chamber easy to install and maintain.

[0059] like Figure 1 , Figure 5 and Figure 6 As shown, in the combustion chamber provided by this embodiment, the flame tube 2 is located in the middle part of the combustion chamber casing 1, the outer periphery of the second circular ring structure 32 is welded to the flame tube 2, and a plurality of cooling holes 321 are opened on the second circular ring structure 32. When compressed air flows through, a cooling air film is formed on the second circular ring structure 32, thereby improving the second circular ring structure 32's ability to resist high temperature radiation. The right end of the combustion chamber casing 1 is connected to the first annular structure 31, which is a circular flange. A second stopper 312 is provided on the left side of the first annular structure 31, and the second stopper 312 is a circular protrusion extending from the first annular structure 31. When the circular protrusion is engaged with the end of the combustion chamber casing 1, the fixing member 3 is successfully matched with the combustion chamber casing 1; a first stopper 311 structure is provided on the right side of the first annular structure 31, and the first stopper 311 structure is a circular groove on the inner wall of the first annular structure 31. When the circular groove is engaged with the protrusion on the turbine casing 8, the fixing member 3 is successfully matched with the turbine casing 8; the turbine casing 8 and the fixing member 3 are fixed to the end of the combustion chamber casing 1 by screws. A locking plate is provided between the screw and the right end of the combustion chamber casing 1. The first circular ring structure 31 and the second circular ring structure 32 are connected by a cylindrical member, and the inner diameter of the first circular ring structure 31 is larger than the inner diameter of the second circular ring structure 32. The cylindrical member gradually collapses from the first circular ring structure 31 toward the second circular ring structure 32, and a plurality of rectangular grooves 33 are spaced apart on the side wall of the cylindrical member.

[0060] like Figures 2 to 4As shown, in the combustion chamber provided in this embodiment, the flame tube 2 includes a flame tube body, a wave-shaped ring 22, a front ring 23 and a positioning ring 24, and a compressed air flow channel 4 is formed between the flame tube 2 and the combustion chamber casing 1. The flame tube 2 body includes a first outer ring 211, a second outer ring 212, an outer connecting ring 213 and a flame tube inner body 214. The first outer ring 211 is a thin-walled plate that forms an arc-shaped cylindrical structure. The wave-shaped ring 22 is an integral stamping part. The wave-shaped ring 22 is an annular shape. The wave-shaped ring 22 has a plurality of convex surfaces 221 and a plurality of concave surfaces 222. The plurality of concave surfaces 222 and the plurality of convex surfaces 221 are spaced apart from each other and evenly distributed on the wave-shaped ring 22, that is, the plurality of convex surfaces 221 and the concave surfaces 222 are alternately distributed on the wave-shaped ring 22 along the circumference. The two sides of the wave-shaped ring 22 are respectively welded to the inner wall of the first outer ring 211 and the inner wall of the front ring 23. The first outer ring 211 is fixedly connected to the front ring 23, and the first air inlet channel is formed between the concave surface 222 of the wave ring 22 and the inner wall of the first outer ring 211. The front ring 23 is fixedly connected to the wave ring 22 by spot welding, the positioning ring 24 is fixedly connected to the front ring 23 by spot welding, the clamping ring is fixedly connected to the front ring 23 by rivets, and the gasket is arranged between the clamping ring and the front ring 23. One side of the positioning ring 24 is fixedly connected to the front ring 23, and the other side of the positioning ring 24 is plugged into the inner wall of the combustion chamber casing 1. The positioning ring 24 is provided with a plurality of jet holes, and the angle between the jet holes and the horizontal direction is -50°, so that the flow speed of the compressed air outside the front ring 23 is increased. There are a plurality of first air inlet channels formed by concave and convex surfaces on the wave ring 22, and the plurality of first air inlet channels are distributed along the circumferential direction of the wave ring 22. The plurality of first air inlet channels can form a wall-attached air film with a large penetration depth in the circumferential direction of the flame tube, thereby realizing efficient cooling of the flame tube. The front ring 23 is provided with a plurality of holes, and compressed air can enter the combustion cavity 25 from the plurality of first air inlet passages of the wave ring 22 and the holes on the front ring 23 . The compressed air enters from the compressed air flow channel 4 and is input into the combustion cavity 25 through the first air inlet passage. The side of the first outer ring 211 away from the corrugated ring 22 is connected to the second outer ring 212 by argon arc welding. The second outer ring 212 is a straight cylindrical structure surrounded by thin-walled plates. The side of the second outer ring 212 away from the first outer ring 211 is connected to the outer connecting ring 213 by argon arc welding. The side of the outer connecting ring 213 away from the second outer ring 212 is connected to the second circular ring structure 32 by argon arc welding. The outer connecting ring 213 is also an arc-shaped cylindrical structure surrounded by thin-walled plates; the second outer ring 212 is provided with a flange hole. In actual application, the second outer ring 212 is provided with two flange holes. The compressed air in the compressed air flow channel 4 enters the combustion cavity 25 from the two flange holes. The two flange holes are the second air inlet channel 2121. The flange hole is a hole that gradually shrinks toward the combustion cavity 25.The first outer ring 211, the second outer ring 212 and the outer connecting ring 213 enclose the outer boundary of the combustion cavity 25. The flame tube inner body 214 extends into the combustion cavity 25. The flame tube inner body 214 constitutes the inner boundary of the combustion cavity 25. An outlet is provided on the flame tube inner body 214, and the outlet is the third air intake channel 2141. The outlet is a hole that gradually shrinks toward the combustion cavity 25. The compressed air in the compressed air flow channel 4 passes through the rectangular groove and is transported to the flame tube inner body 214 through the combustion guide hollow blades 9, and is transported to the combustion cavity 25 from the outlet. The fuel is sprayed into the combustion cavity 25 through the high-speed rotation of the oil-slinging plate 7 and mixed with the compressed air in the combustion cavity 25. A bushing mounting seat 51 is provided on the outer wall of the second outer ring 212. The bushing mounting seat 51 is fixed to the outer wall of the second outer ring 212 by welding. The movable bushing 52 is elastically connected to the bushing mounting seat 51. The movable bushing 52 can move freely in the bushing mounting seat 51. The electric nozzle can be inserted into the movable bushing 52. The electric nozzle ignites the compressed air and fuel mixture in the combustion cavity 25 to realize the combustion process, and the combustion gas is discharged backward to the turbine.

[0061] The combustion chamber provided in this embodiment has an installation process as follows:

[0062] The second annular structure 32 is welded and fixed on the outer connecting ring 213, and then the positioning ring 24 is plugged into the combustion chamber casing 1, and then the first stop 311 is clamped with the inner wall of the end of the combustion chamber casing 1, and then the turbine casing 8 is clamped with the second stop 312, and finally, the turbine casing 8 and the fixing part 3 are fixed to the combustion chamber casing 1 by screws.

[0063] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A combustion chamber, characterized in that: include: Combustion chamber casing (1); A flame tube (2), wherein the flame tube (2) is arranged in the combustion chamber casing (1); A fixing member (3), the fixing member (3) comprising a first circular ring structure (31) fixedly connected to the end of the combustion chamber casing (1), and a second circular ring structure (32) fixedly connected to the flame tube (2), the first circular ring structure (31) and the second circular ring structure (32) being connected via a cylindrical member; A first stopper (311), the first stopper (311) being arranged on one side of the first circular ring structure (31), the first stopper (311) being suitable for being engaged with a turbine casing (8); A second stop (312), the second stop (312) being arranged on the other side of the first annular structure (31), the second stop (312) being suitable for being snap-fitted with the end of the combustion chamber casing (1); The flame tube (2) comprises: A flame tube body, wherein the flame tube body is fixedly connected to the second circular ring structure (32); A wave-shaped ring (22), the wave-shaped ring (22) having a plurality of convex surfaces (221) and a plurality of concave surfaces (222), the plurality of convex surfaces (221) and the plurality of concave surfaces (222) being spaced apart from each other and evenly distributed on the wave-shaped ring (22), the convex surface (221) being fixedly connected to the flame tube body, and a first air inlet passage being formed between the concave surface (222) and the flame tube body; A first outer ring (211), wherein the first outer ring (211) is fixedly connected to the wave-shaped ring (22); a second outer ring (212), one side of the second outer ring (212) being fixedly connected to a side of the first outer ring (211) away from the corrugated ring (22), the other side of the second outer ring (212) being fixedly connected to the second circular ring structure (32) via an outer connecting ring (213), and a second air inlet passage (2121) being provided on the second outer ring (212); The first outer ring (211), the second outer ring (212) and the outer connecting ring (213) enclose a combustion cavity (25); The flame tube body also includes a flame tube inner body (214), the flame tube inner body (214) is arranged in the combustion cavity (25), and a third air intake passage (2141) is provided on the flame tube inner body (214), and a plurality of rectangular grooves (33) are opened on the outer side wall of the tubular member, and the rectangular grooves (33) are connected to the third air intake passage (2141).

2. The combustion chamber according to claim 1, characterized in that The inner diameter of the first circular ring structure (31) is greater than the inner diameter of the second circular ring structure (32).

3. The combustion chamber according to claim 1, characterized in that The second annular structure (32) is provided with a plurality of cooling holes (321).

4. The combustion chamber according to claim 3, characterized in that The flame tube (2) further comprises: A front ring (23), wherein the front ring (23) is fixedly connected to the wave-shaped ring (22); A positioning ring (24), one side of which is fixedly connected to the front ring (23), and the other side of which is plugged into the inner wall of the combustion chamber casing (1), and a plurality of jet holes are provided on the positioning ring (24), and the jet holes are suitable for introducing compressed air.

5. The combustion chamber according to claim 4, characterized in that Also includes: A bushing mounting seat (51), wherein the bushing mounting seat (51) is fixedly connected to the outer side wall of the flame tube body; A movable bushing (52), the movable bushing (52) being connected to the bushing mounting seat (51), and the movable bushing (52) being suitable for inserting an electric nozzle.

6. The combustion chamber according to any one of claims 1 to 5, characterized in that A compressed air flow channel (4) is formed between the flame tube (2) and the combustion chamber casing (1).

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