Micro-miniature turbojet engine exhaust device

Abstract

The utility model discloses a microminiature turbojet engine exhaust device, which relates to the technical field of engines and comprises a casing, an exhaust component and a turbine. The exhaust assembly comprises an exhaust nozzle, an exhaust cone and a connector; the exhaust nozzle is connected with the cartridge receiver, and the exhaust cone is installed in the exhaust nozzle through the connector; and the turbine is fixed on a rotating shaft of the turbojet engine. The exhaust assembly structure provided by the utility model can be suitable for a microminiature turbojet engine, is simple in overall structure and low in assembly and welding difficulty, and can meet the requirement of high-efficiency batch production while ensuring the product reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an exhaust device for a micro-sized turbojet engine. Background Art

[0002] Turbojet engines are also called turbojet engines for short. They are usually composed of an air intake, a compressor, a combustion chamber, a turbine and a tail nozzle. In a turbojet engine, the compressor turbine at the front end of the engine first compresses the air, and the temperature of the compressed air rises; the air enters the combustion chamber from the compressor, atomizing the fuel to form an oil-gas mixture; the spark plug or glow plug ignites the mixture, and the fuel gas explodes to do work, forming high-temperature and high-pressure gas; the high-pressure gas drives the turbine to rotate, and the turbine drives the compressor turbine to inhale air through the transmission shaft, forming the entire heat engine cycle.

[0003] Among them, the high-temperature and high-pressure gas passing through the turbine needs to be discharged through the exhaust assembly. However, the exhaust assembly of the existing turbojet engine is complicated to assemble, the welding operation space is small, and the production of the exhaust assembly needs to be completed with welding tooling and assembly tooling, which has low reliability and production efficiency. Compared with conventional engines, micro-turbine engines are small in size and light in weight, and are widely used in micro-unmanned target drones, etc., but the above problems still exist.

[0004] Therefore, it is necessary to design a novel micro-turbojet engine exhaust device to solve the existing problems. Utility Model Content

[0005] In order to solve the problems of complex assembly and low production efficiency of existing exhaust components, the utility model provides an exhaust device for a micro-sized turbojet engine.

[0006] In order to achieve the purpose of the utility model, the technical solution adopted by the utility model is as follows:

[0007] A micro-sized turbojet engine exhaust device comprises a casing, an exhaust assembly and a turbine; the exhaust assembly comprises a tail nozzle, an exhaust cone and a connector; the tail nozzle is connected to the casing, and the exhaust cone is installed inside the tail nozzle through the connector; the turbine is fixed on the rotating shaft of the turbojet engine.

[0008] Based on the above technical solution, further, the tail nozzle includes a tail nozzle cylindrical section, a tail nozzle convergent cone section and a tail nozzle convex section, one end of the tail nozzle cylindrical section is connected to the tail nozzle convergent cone section by integral molding or welding; the other end of the tail nozzle cylindrical section is connected to the tail nozzle convex section by integral molding or welding.

[0009] Based on the above technical solution, further, it also includes a fixing piece, and a plurality of connecting holes are provided on the convex section of the tail nozzle, and the fixing piece passes through the connecting holes to fix the tail nozzle and the casing.

[0010] Based on the above technical solution, further, a plurality of tail nozzle grooves are opened on the tail nozzle cylindrical section, and the plurality of tail nozzle grooves are arranged at intervals along the outer circumference of the tail nozzle cylindrical section.

[0011] Based on the above technical solution, further, the exhaust cone includes an exhaust cone cylindrical section and an exhaust cone arc section, and an exhaust cone groove is opened on the exhaust cone cylindrical section or the exhaust cone arc section.

[0012] Based on the above technical solution, further, the connector includes a connector vertical section and a connector arc section, and the connector vertical section and the connector arc section are connected by integral molding or welding.

[0013] Based on the above technical solution, further, one end of the vertical section of the connector passes through the tail nozzle groove and the exhaust cone groove until one end of the vertical section of the connector is located inside the exhaust cone.

[0014] Based on the above technical solution, further, the arc section of the connector is connected to the outer side of the cylindrical section of the tail nozzle by welding.

[0015] Based on the above technical solution, further, a gap is provided between the blades of the turbine and the exhaust cone cylindrical section.

[0016] Based on the above technical solution, further, the fixing member is a connecting bolt.

[0017] Compared with the prior art, the beneficial effects of the present invention are specifically embodied in:

[0018] The exhaust device provided by the utility model can be applicable to a micro-sized turbojet engine, has a simple overall structure, and is easy to assemble and weld, and can meet the needs of high-efficiency mass production while ensuring product reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional schematic diagram of the exhaust device of a micro-sized turbojet engine provided by the utility model;

[0020] Figure 2 This is an axonometric diagram of the exhaust device of a micro-sized turbojet engine provided by the utility model;

[0021] Figure 3 yes Figure 1 Rear view of

[0022] Figure 4 yes Figure 1 A schematic diagram of the front view of the exhaust assembly;

[0023] Figure 5 yes Figure 1Schematic diagram of the rear view of the mid-exhaust assembly;

[0024] Figure 6 yes Figure 4 A side view of the exhaust assembly;

[0025] Figure 7 yes Figure 1 Schematic diagram of the structure of the mid-tail nozzle;

[0026] Figure 8 yes Figure 7 Side view of

[0027] Fig. 9 yes Figure 1 Schematic diagram of the structure of the middle exhaust cone;

[0028] Fig.10 yes Fig. 9 Side view of

[0029] Fig.11 yes Figure 1 Schematic diagram of the structure of the connector;

[0030] Fig.12 yes Fig.11 Side view of

[0031] Fig.13 yes Fig.11 Right view of .

[0032] Reference numerals:

[0033] 1. Casing; 2. Exhaust assembly; 3. Fixings; 4. Turbine; 21. Tail nozzle; 22. Exhaust cone; 23. Connector; 211. Tail nozzle cylindrical section; 212. Tail nozzle convergent cone section; 213. Tail nozzle groove; 214. Connecting hole; 215. Tail nozzle raised section; 221. Exhaust cone cylindrical section; 222. Exhaust cone arc cone section; 223. Exhaust cone groove; 231. Connector vertical section; 232. Connector arc section. DETAILED DESCRIPTION

[0034] The present invention is further described and illustrated below in conjunction with the accompanying drawings and specific implementations. The technical features of each implementation of the present invention can be combined accordingly without conflicting with each other.

[0035] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model. Therefore, the utility model is not limited by the specific embodiments disclosed below. The technical features in each embodiment of the utility model can be combined accordingly without conflicting with each other.

[0036] Example

[0037] like Figure 1-Figure 13 As shown, in this embodiment, a micro-sized turbojet engine exhaust device is provided, which includes a casing 1, an exhaust assembly 2, a fixing member 3 and a turbine 4; a bolt connection hole is provided at the rear end of the casing 1, a bolt connection hole is provided at the connection portion between the exhaust assembly 2 and the casing 1, the exhaust assembly 2 is fixed to the rear end of the casing 1 through a plurality of fixing members 3, and the turbine 4 is fixed to the rotating shaft of the engine. Among them, the fixing member 3 can select a connecting bolt with a fixed connection function.

[0038] The exhaust assembly 2 includes a tail nozzle 21, an exhaust cone 22 and a connector 23; the tail nozzle 21 is connected to the casing 1, and the exhaust cone 22 is installed inside the tail nozzle 21 through the connector 23; specifically, one end of the connector 23 is fixed to the outside of the tail nozzle 21, and the other end of the connector 23 is fixed to the exhaust cone 22.

[0039] After the exhaust cone 22 is placed inside the tail nozzle 21, the connector 23 passes through the tail nozzle 21 and is inserted into the exhaust cone 22. The exhaust cone 22 is fixed by the action of no less than 3 connectors 23; the connector 23 is fixed to the outside of the tail nozzle 21 by welding, which can prevent the leakage of high-temperature combustion gas; after the exhaust assembly 2 is assembled and welded, it is fixed to the rear end of the casing by several fixings 3, so that the tail nozzle 21 and the exhaust cone 22 are connected and fixed to the micro-turbojet engine. Among them, the tail nozzle convergent cone section 212 presents a reduced structure, specifically, the diameter of the tail nozzle convergent cone section 212 part of the structure away from the tail nozzle cylindrical section 211 gradually decreases. This solution has a simple structure, low difficulty in assembly and welding, and can meet the needs of high-efficiency mass production while ensuring product reliability.

[0040] In this embodiment, the tail nozzle 21 includes a tail nozzle cylindrical section 211, a tail nozzle convergent cone section 212 and a tail nozzle convex section 215, wherein one end of the tail nozzle cylindrical section 211 is connected to the tail nozzle convergent cone section 212 by integral molding or welding; the other end of the tail nozzle cylindrical section 211 is connected to the tail nozzle convex section 215 by integral molding or welding. The tail nozzle convex section 215 is provided with a plurality of connection holes 214, and the fixing member 3 passes through the connection holes 214 to fix the tail nozzle 21 to the casing 1, and a plurality of tail nozzle grooves 213 are opened on the tail nozzle cylindrical section 211, and the plurality of tail nozzle grooves 213 are arranged at intervals along the outer circumference of the tail nozzle cylindrical section 211.

[0041] In this embodiment, the thickness of the tail nozzle 21 is 0.5-2.0 mm, the acute angle A between the extension line of the tail nozzle cylindrical section 211 on the tail nozzle 21 and the tail nozzle convergent cone section 212 is 5°-25°, and the ratio between the axial length L of the tail nozzle cylindrical section 211 and the axial length H of the tail nozzle convergent cone section 212 is in the range of 0.8-1.2. The number of tail nozzle grooves 213 on the tail nozzle 21 is 3-12, the length-to-width ratio of the tail nozzle grooves 213 is in the range of 2-6, the tail nozzle grooves 213 are located in the 1 / 4-3 / 4 area of ​​the axis of the tail nozzle cylindrical section 211, and the tail nozzle grooves 213 are evenly distributed along the circumferential direction of the tail nozzle cylindrical section 211.

[0042] In this embodiment, the exhaust cone 22 includes an exhaust cone cylindrical section 221 and an exhaust cone arc section 222, and an exhaust cone groove 223 is formed on the exhaust cone cylindrical section 221 or the exhaust cone arc section 222. The thickness of the exhaust cone 22 is 0.5-2.0 mm, and the ratio of the axial distance between the exhaust cone cylindrical section 221 and the exhaust cone arc section 222 on the exhaust cone 22 is 0.2-0.5. The shape of the exhaust cone arc section 222 on the exhaust cone 22 is semicircular or semi-elliptical. The number of the exhaust cone grooves 223 on the exhaust cone 22 is 3-12, and the aspect ratio of the exhaust cone grooves 223 is 2-6. The exhaust cone grooves 223 are on the exhaust cone cylindrical section 221 or the exhaust cone arc section 222.

[0043] In this embodiment, the connector 23 includes a connector vertical section 231 and a connector arc section 232, and the connector vertical section 231 and the connector arc section 232 are connected by integral molding or welding. The length ratio of the long side C to the wide side D of the connector vertical section 231 is in the range of 2-6, and the height of the rectangular part 231 needs to ensure that there is still a 2-10mm margin after passing through the exhaust cone 22. The thickness of the connector arc section 232 is 0.6-1.2mm, and the curvature of the connector arc section 232 is the same as the curvature of the tail nozzle cylindrical section 211, which is conducive to ensuring the sealing performance of the gas on the one hand and facilitating welding on the other hand. The length of the side length E of the connector arc section 232 along the axial direction of the engine is 1.2-2 times the length of the long side C of the connector vertical section 231, and the length of the side length E of the connector arc section 232 along the circumferential direction of the engine is 2-5 times the length of the wide side of the connector vertical section 231. The connector vertical section 231 on the connector 23 is inserted into the exhaust cone groove 223 on the exhaust cone cylindrical section 221 or the exhaust cone arc section 222 on the exhaust cone 22. The number of connectors 23 is set to 3-12 according to the different thrust sizes of the engine, and the exhaust cone 22 is fixed by connecting no less than 3 connector vertical sections 231 on the connectors 23. Furthermore, the welding method of the connector arc section 232 on the connector 23 to the outer side of the tail nozzle cylindrical section 211 on the tail nozzle 21 can be argon arc welding, laser welding, cold welding, etc. The material of the connector 23 can be heat-resistant stainless steel, titanium alloy or high-temperature alloy, etc.

[0044] A certain gap is left between the rear end of the turbine blade 4 and the front end of the exhaust cone cylindrical section 221 on the exhaust cone 22 to prevent the turbine 4 from interfering with the exhaust cone 22 when rotating. Other technologies of this embodiment adopt existing technologies and will not be described in detail here.

[0045] The above is only an implementation method of the utility model, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A micro-turbojet engine exhaust device, characterized in that: It comprises a casing (1), an exhaust assembly (2) and a turbine (4); The exhaust assembly (2) comprises a tail nozzle (21), an exhaust cone (22) and a connector (23); The tail nozzle (21) is connected to the casing (1), and the exhaust cone (22) is installed inside the tail nozzle (21) via a connector (23); The turbine (4) is fixed on the rotating shaft of the turbojet engine.

2. The micro-turbojet engine exhaust device according to claim 1, characterized in that: The tail nozzle (21) comprises a tail nozzle cylindrical section (211), a tail nozzle convergent cone section (212) and a tail nozzle convex section (215); one end of the tail nozzle cylindrical section (211) is connected to the tail nozzle convergent cone section (212) by integral molding or welding; and the other end of the tail nozzle cylindrical section (211) is connected to the tail nozzle convex section (215) by integral molding or welding.

3. The micro-turbojet engine exhaust device according to claim 2, characterized in that: It also includes a fixing member (3), wherein the tail nozzle protruding section (215) is provided with a plurality of connection holes (214), and the fixing member (3) passes through the connection holes (214) to fix the tail nozzle (21) to the casing (1).

4. The micro-turbojet engine exhaust device according to claim 3, characterized in that: A plurality of tail nozzle grooves (213) are provided on the tail nozzle cylindrical section (211), and the plurality of tail nozzle grooves (213) are arranged at intervals along the outer circumference of the tail nozzle cylindrical section (211).

5. The micro-turbojet engine exhaust device according to claim 4, characterized in that: The exhaust cone (22) comprises an exhaust cone cylindrical section (221) and an exhaust cone circular arc section (222), and an exhaust cone groove (223) is provided on the exhaust cone cylindrical section (221) or the exhaust cone circular arc section (222).

6. The exhaust device of a micro-turbojet engine according to claim 5, characterized in that: The connector (23) comprises a connector vertical section (231) and a connector circular arc section (232); the connector vertical section (231) and the connector circular arc section (232) are connected by integral molding or welding.

7. The micro-turbojet engine exhaust device according to claim 6, characterized in that: One end of the connector vertical section (231) passes through the tail nozzle groove (213) and the exhaust cone groove (223) until it is located inside the exhaust cone (22).

8. The exhaust device of a micro-turbojet engine according to claim 6, characterized in that: The connector arc section (232) is connected to the outer side of the tail nozzle cylindrical section (211) by welding.

9. The exhaust device of a micro-turbojet engine according to claim 5, characterized in that: A gap is provided between the blades of the turbine (4) and the exhaust cone cylindrical section (221).

10. The micro-turbojet engine exhaust device according to claim 3, characterized in that: The fixing member (3) is a connecting bolt.

Images