Micro-miniature turbojet engine fuel pipe based on 3D printing technology

Abstract

The utility model belongs to the technical field of microminiature turbojet engines, and particularly relates to a microminiature turbojet engine fuel pipe based on the 3D printing technology, which comprises a fuel delivery pipe, a fuel mother pipe and a fuel branch pipe which are communicated with one another, and the fuel delivery pipe is composed of a fuel delivery pipe linear section and a fuel delivery pipe bent section. The fuel mother pipe is of a variable-diameter circular ring structure with internal circulation, the straight section of the fuel conveying pipe is perpendicular to the plane where the fuel mother pipe is located, the right end of the bent section of the fuel conveying pipe is communicated with the fuel mother pipe, a plurality of fuel branch pipes are annularly distributed on the left side of the fuel mother pipe, and the right ends of the fuel branch pipes are communicated with the fuel mother pipe. The fuel pipe of the microminiature turbojet engine is simple in structure, does not need additional procedures such as welding, is extremely small in product deformation and high in strength, and is favorable for realizing automatic batch production; the variable cross-section design of the fuel mother pipe is beneficial to improving the uniformity of fuel distribution, and then the performance and the working reliability of the engine are improved.

Description

Technical Field

[0001] The micro - mini turbojet engine of the present utility model belongs to the technical field, and particularly relates to a fuel pipe of a micro - mini turbojet engine based on 3D printing technology. Background Art

[0002] The micro - mini turbojet engine is one of the optional power devices for small cruise missiles and unmanned aerial vehicles.

[0003] For the micro - mini turbojet engines currently on the market, their fuel delivery pipes, fuel main pipes, and fuel branch pipes are all of split - type structures. After the production of these three parts is completed, they are assembled and welded. On the one hand, the production cycle is relatively long and the production efficiency is low; on the other hand, molds for production, assembly, and welding need to be designed, and welding is likely to cause deformation of the parts, affecting the performance of the engine. Summary of the Utility Model

[0004] The problem to be solved by the present utility model is: to overcome the defects of low production efficiency, complex assembly, and welding deformation of the fuel pipes of micro - mini turbojet engines in the prior art.

[0005] To solve the above - mentioned technical problems, the present utility model provides the following technical solutions:

[0006] A fuel pipe of a micro - mini turbojet engine based on 3D printing technology includes a fuel delivery pipe, a fuel main pipe, and a fuel branch pipe that are interconnected. The fuel delivery pipe is composed of a straight section of the fuel delivery pipe and a bent section of the fuel delivery pipe. The plane where the straight section of the fuel delivery pipe is located is perpendicular to the plane where the fuel main pipe is located. The right end of the bent section of the fuel delivery pipe is connected to the fuel main pipe. A number of fuel branch pipes are annularly distributed on the left side of the fuel main pipe, and the right ends of the fuel branch pipes are connected to the fuel main pipe. The fuel main pipe is composed of a circular tube body of the fuel main pipe and an inner cavity of the fuel main pipe. The cross - section of the inner cavity of the fuel main pipe is a circle with a changing diameter, and the ratio range of the diameter of the maximum cross - section to the diameter of the minimum cross - section of the inner cavity of the fuel main pipe is 1.2 - 2.5.

[0007] Further, the included angle between the extending direction of the straight section of the fuel delivery pipe and the bent section of the fuel delivery pipe is 160° - 175°.

[0008] Further, the ratio range of the length of the straight section of the fuel delivery pipe to the length of the bent section of the fuel delivery pipe is 5 - 30.

[0009] Further, the fuel delivery pipe has an inner cavity for fuel flow, and the wall thickness of the fuel delivery pipe is 0.5 mm - 2 mm.

[0010] Further, the wall thickness of the fuel main pipe is 0.5 mm - 2 mm.

[0011] Furthermore, there is an inner cavity in the fuel branch pipe, and the wall thickness of the fuel branch pipe is 0.3 mm - 1.0 mm.

[0012] Furthermore, the fuel branch pipe is composed of a fuel branch pipe closed end and a fuel branch pipe cylindrical section.

[0013] Furthermore, a number of fuel injection holes are provided at the fuel branch pipe closed end.

[0014] Furthermore, the diameter of the fuel injection hole is 0.2 mm - 1.0 mm.

[0015] Furthermore, the number of the fuel injection holes is 4 - 20.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model provides a micro - miniaturized turbofan engine fuel pipe based on 3D printing technology, which has a simple structure, does not require additional processes such as welding, has extremely small product deformation, high strength, and is conducive to realizing automated mass production; in addition, the variable cross - section design of the fuel main pipe in the utility model is beneficial to improving the uniformity of fuel distribution, thereby enhancing the performance and working reliability of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a micro - miniaturized turbofan engine fuel pipe based on 3D printing technology provided by the specific embodiment of the utility model;

[0019] Figure 2 is Figure 1 a cross - sectional view in the main viewing direction of

[0020] Figure 3 is Figure 2 a partial detail view at C of

[0021] Figure 4 is Figure 2 a cross - sectional view of the A - A section of

[0022] Figure 5 is Figure 2 a left view of

[0023] Figure 6 is Figure 5 a cross - sectional view of the B - B section of

[0024] Figure 7 is Figure 6 a partial detail view at D of

[0025] Reference numerals:

[0026] 1 is a fuel delivery pipe, 11 is a straight section of the fuel delivery pipe, 12 is a bent section of the fuel delivery pipe, 13 is the inner cavity of the fuel delivery pipe, 2 is a fuel main pipe, 21 is a circular pipe body of the fuel main pipe, 22 is the inner cavity of the fuel main pipe, 3 is a fuel branch pipe, 31 is a closed end of the fuel branch pipe, 32 is a cylindrical section of the fuel branch pipe, 33 is the inner cavity of the fuel branch pipe, and 34 is a fuel injection hole. Detailed implementation mode

[0027] The technical solution of the present invention will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] It should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "horizontal", "left", "right", "front", "rear", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention.

[0029] As Figure 1 shown, the present invention provides a micro turbojet engine fuel pipe based on 3D printing technology, including a fuel delivery pipe 1, a fuel main pipe 2, and a fuel branch pipe 3 that are interconnected;

[0030] As Figure 2 and Figure 3 shown, the fuel delivery pipe 1 is composed of a straight section 11 of the fuel delivery pipe with a certain wall thickness and a bent section 12 of the fuel delivery pipe;

[0031] The included angle between the straight section 11 of the fuel delivery pipe and the bent section 12 of the fuel delivery pipe is 160° - 175°;

[0032] The length ratio range of the straight section 11 of the fuel delivery pipe to the bent section 12 of the fuel delivery pipe is 5 - 30, and the length of the straight section 11 of the fuel delivery pipe is 80 mm - 300 mm.

[0033] The wall thickness of the fuel delivery pipe 1 is 0.5 mm - 2 mm.

[0034] The fuel delivery pipe 1 has an inner cavity 13 for fuel flow.

[0035] The cross-section of the inner cavity 13 of the fuel delivery pipe is circular, and the cross-sectional diameter of the inner cavity 13 of the fuel delivery pipe is 2 mm - 8 mm.

[0036] The fuel main pipe 2 has a variable-diameter circular ring structure with internal circulation. In the field of engineering technology, variable diameter refers to a design or technology that changes the diameter of a pipeline or channel to adapt to different working conditions or optimize performance.

[0037] The fuel main pipe 2 consists of a circular tube body 21 of the fuel main pipe and an inner cavity 22 of the fuel main pipe. The cross-section of the inner cavity 22 of the fuel main pipe is a circle with a variable diameter.

[0038] The cross-sectional diameter of the inner cavity 22 of the fuel main pipe is 3 mm - 12 mm.

[0039] The wall thickness of the fuel main pipe 2 is 0.5 mm - 2 mm, and the ratio range of the diameter of the largest cross-section to the smallest cross-section of the inner cavity 22 of the fuel main pipe is 1.2 - 2.5.

[0040] Combined with Figures 1-4 As shown, the straight section 11 of the fuel delivery pipe is perpendicular to the plane where the fuel main pipe 2 is located, and the right end of the bent section 12 of the fuel delivery pipe is connected to the fuel main pipe 2;

[0041] As Figure 5 shown, several fuel branch pipes 3 are annularly distributed on the left side of the fuel main pipe 2, and the right ends of the fuel branch pipes 3 are connected to the fuel main pipe 2.

[0042] The wall thickness of the fuel branch pipe 3 is 0.3 mm - 1.0 mm, and there is an inner cavity 33 of the fuel branch pipe inside the fuel branch pipe 3.

[0043] The length of the fuel branch pipe 3 is 10 mm - 80 mm.

[0044] The cross-sectional diameter of the inner cavity 33 of the fuel branch pipe is 1 mm - 6 mm.

[0045] As Figure 6 、 Figure 7 shown, the fuel branch pipe 3 consists of a closed end 31 of the fuel branch pipe and a cylindrical section 32 of the fuel branch pipe.

[0046] Fuel injection holes 34 are arranged near the closed end 31 of the fuel branch pipe. The number of fuel injection holes 34 is 4 - 20, and the diameter of the fuel injection holes 34 is 0.2 mm - 1.0 mm.

[0047] In a preferred technical solution of the present utility model, there are 2 - 10 groups of fuel injection holes 34. The number of fuel injection holes 34 in each group is 2. The two fuel injection holes 34 in each group of fuel injection holes 34 are symmetrically distributed along the circumferential direction of the inner cavity 33 of the fuel branch pipe, and the adjacent two groups of fuel injection holes 34 are perpendicular to each other.

[0048] In a preferred technical solution of the present utility model, the axial distance between the adjacent two groups of fuel injection holes 34 is 2 mm - 5 mm.

[0049] The fuel delivery pipe 1, the fuel main pipe 2 and the fuel branch pipe 3 are interconnected with each other, and the three are integrally formed by 3D printing. The 3D printing is carried out from the fuel main pipe 2 towards the fuel delivery pipe 1 and the fuel branch pipe 3.

[0050] The materials of the fuel delivery pipe 1, the fuel main pipe 2 and the fuel branch pipe 3 can be stainless steel, superalloy or titanium alloy.

[0051] Fuels such as aviation kerosene or diesel are supplied from outside the engine, flow through the fuel delivery pipe 1 and then enter the fuel main pipe 2. The variable cross-section design of the fuel main pipe 2 is beneficial to improving the uniformity of fuel distribution. After gathering in the fuel main pipe 2, the fuel enters several fuel branch pipes 3, and finally the fuel is ejected from the fuel injection holes 34 of the fuel branch pipe 3 and mixed and burned with the air inhaled by the engine.

[0052] Other technologies in this embodiment adopt existing technologies.

[0053] The above technical features constitute the best embodiment of the present utility model, which has strong adaptability and the best implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the needs of different situations.

[0054] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present utility model, rather than a limitation on the protection scope of the present utility model. Simple modifications or equivalent replacements made by those of ordinary skill in the art to the technical solution of the present utility model do not depart from the essence and scope of the technical solution of the present utility model.

Claims

1. A micro turbojet engine fuel pipe based on 3D printing technology, comprising a fuel delivery pipe, a fuel main pipe and fuel branch pipes that are interconnected, characterized in that, The fuel delivery pipe consists of a straight section of the fuel delivery pipe and a bent section of the fuel delivery pipe. The straight section of the fuel delivery pipe is perpendicular to the plane where the fuel main pipe is located. The right end of the bent section of the fuel delivery pipe is connected to the fuel main pipe. A number of fuel branch pipes are annularly distributed on the left side of the fuel main pipe. The right end of the fuel branch pipe is connected to the fuel main pipe. The fuel main pipe consists of a circular pipe body of the fuel main pipe and an inner cavity of the fuel main pipe. The cross-section of the inner cavity of the fuel main pipe is a circle with a changing diameter. The ratio range of the diameter of the largest cross-section to the diameter of the smallest cross-section of the inner cavity of the fuel main pipe is 1.2 - 2.

5.

2. The micro-turbofan engine fuel pipe based on 3D printing technology according to claim 1, characterized in that, The included angle between the straight section of the fuel delivery pipe and the bent section of the fuel delivery pipe is 160° - 175°.

3. The micro-turbofan engine fuel pipe based on 3D printing technology according to claim 1, characterized in that, The ratio range of the length of the straight section of the fuel delivery pipe to the length of the bent section of the fuel delivery pipe is 5 - 30.

4. The fuel pipe of the micro turbojet engine based on 3D printing technology according to claim 1, characterized in that, The fuel delivery pipe has an inner cavity for fuel flow, and the wall thickness of the fuel delivery pipe is 0.5 mm - 2 mm.

5. The micro-turboshaft engine fuel pipe based on 3D printing technology according to claim 1, characterized in that The wall thickness of the fuel main pipe is 0.5 mm - 2 mm.

6. The fuel pipe of the micro turbojet engine based on 3D printing technology according to claim 1, wherein The fuel branch pipe has an inner cavity of the fuel branch pipe inside, and the wall thickness of the fuel branch pipe is 0.3 mm - 1.0 mm.

7. The fuel pipe of the micro turbojet engine based on 3D printing technology according to claim 1, characterized in that, The fuel branch pipe consists of a closed end of the fuel branch pipe and a cylindrical section of the fuel branch pipe.

8. The fuel pipe of the micro turbojet engine based on 3D printing technology according to claim 7, characterized in that, A number of fuel injection holes are provided at the closed end of the fuel branch pipe.

9. The fuel pipe of the micro turbojet engine based on 3D printing technology according to claim 8, characterized in that, The diameter of the fuel injection hole is 0.2 mm - 1.0 mm.

10. The fuel pipe of the micro turbojet engine based on 3D printing technology according to claim 8, characterized in that, The number of fuel injection holes is 4 - 20.

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