Air inlet adapter pipe of aero-engine

Abstract

An air inlet adapter of an aero-engine is connected between a cylinder head and a carburetor. The air inlet adapter pipe is provided with an upper end face connected with a carburetor and a lower end face connected with a cylinder head, and a pair of connecting holes and a variable cross-section air inlet channel of a structure with a round upper portion and a round lower portion are arranged between the upper end face and the lower end face in a penetrating mode. The variable cross-section air inlet channel does not make the flow speed of mixed oil gas suddenly changed, the influence of turbulent flow and air resistance on the air inlet efficiency is reduced, and the air inlet efficiency is improved. And the independent air inlet adapter is arranged, so that the universality of the carburetor is improved, and the manufacturing difficulty of the carburetor is reduced. In addition, a negative pressure hole can be formed in the air inlet adapter pipe so that the integration level of the aero-engine can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation engines, in particular to an aviation engine air intake transfer pipe. Background Art

[0002] A piston aircraft engine is mainly composed of components such as a crankshaft, connecting rod, piston, cylinder head, air distributor and casing. Among them, the cross-sectional shape of the cylinder head's intake and exhaust ducts has a significant impact on the performance of the aircraft engine. Tests have shown that intake and exhaust ducts with rectangular cross-sections can improve the intake and exhaust efficiency of aircraft engines. However, the existing carburetor connected to the intake duct has a circular cross-sectional shape. When the mixed oil and gas enter the intake duct from the throat, turbulence and air resistance will be generated, affecting the intake efficiency. A variable cross-sectional air duct structure can reduce the impact of turbulence and air resistance on the intake efficiency, but the carburetor is a die-casting with a complex structure. If a complex variable cross-sectional air duct structure is set at the outlet end of the carburetor, it will not only affect the versatility of the carburetor, but also seriously increase the difficulty of manufacturing the carburetor. Utility Model Content

[0003] In order to overcome the deficiencies in the background technology, the utility model discloses an aircraft engine air intake transfer pipe, the purpose of which is:

[0004] 1. Reduce the impact of turbulence and air resistance on intake efficiency and improve intake efficiency;

[0005] 2. Improve the versatility of the carburetor and reduce the difficulty of manufacturing the carburetor.

[0006] Specifically, the present invention adopts the following technical solutions:

[0007] An aircraft engine air intake adapter pipe is connected between a cylinder head and a carburetor; the air intake adapter pipe has an upper end surface connected to the carburetor and a lower end surface connected to the cylinder head, and a pair of connecting holes and a variable-section air intake duct with an upper circular and lower bottom structure are provided between the upper and lower end surfaces.

[0008] After implementing the above technical solution, compared with the background technology, the beneficial effects produced by the present invention are:

[0009] 1. The intake transfer tube has a variable cross-section intake duct with an upper circular and lower structure. The variable cross-section intake duct reduces the effects of turbulence and air resistance on intake efficiency, thereby improving intake efficiency.

[0010] 2. Setting a separate air intake transfer tube is not only conducive to improving the versatility of the carburetor, but also conducive to reducing the difficulty of manufacturing the carburetor.

[0011] To further improve the technical solution, the carburetor is a vacuum film carburetor; a negative pressure hole is also provided between the upper end surface and the lower end surface, one end of the negative pressure hole is connected to the intake duct of the cylinder head, and the other end is connected to the vacuum film carburetor, which is used to provide negative pressure to the vacuum film carburetor.

[0012] After implementing the above technical solution, the beneficial effects are: the vacuum film carburetor requires the intake duct in the cylinder head to provide negative pressure. Providing a negative pressure hole on the intake transfer pipe can reduce the external air pipe and improve the integration of the aircraft engine.

[0013] To further improve the technical solution, a sink for placing a sealing ring is provided at one end of the negative pressure hole located at the lower end surface.

[0014] After the above technical solution is implemented, the beneficial effect produced is: during assembly, a sealing ring is placed in the sink, which can increase the sealing performance of the negative pressure hole at the connection.

[0015] To further improve the technical solution, the variable-section air inlet is arranged between a pair of connecting holes.

[0016] After implementing the above technical solution, the beneficial effects are: the connecting holes are used to insert bolts, the variable-section intake duct is arranged between a pair of connecting holes, and the carburetor and the intake transfer pipe can be fixed to the cylinder head through the connection of bolts, and the sealing can be ensured.

[0017] To further improve the technical solution, the center of the circular air duct located on the upper end face of the variable-section air inlet duct is eccentrically arranged with respect to the center of the rectangular air duct located on the lower end face of the variable-section air inlet duct.

[0018] After implementing the above technical solution, the beneficial effects are: the intake duct in the cylinder head is curved, and the center of the circular duct is eccentrically arranged with the center of the rectangular duct, which can make the variable-section intake duct smoothly connected with the intake duct in the cylinder head, reducing air resistance.

[0019] To further improve the technical solution, the center of the circular airway is located in the middle of a pair of connecting holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attachment Figure 1 Shown is a schematic diagram of the three-dimensional structure of the air intake transfer pipe.

[0021] Attachment Figure 2 Shown is a schematic diagram of the front structure of the air intake transfer pipe.

[0022] Attachment Figure 3 Shown is a schematic diagram of the reverse structure of the intake transfer tube.

[0023] Attachment Figure 4 Shown is a schematic diagram of the cross-sectional structure of the air intake transfer pipe.

[0024] In the accompanying drawings: 1. Upper end face; 2. Lower end face; 3. Variable-section air inlet duct; 4. Connecting hole; 5. Negative pressure hole. DETAILED DESCRIPTION

[0025] The following describes preferred embodiments of the present invention with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely intended to illustrate the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. It should be noted that, in the description of the present invention, terms such as "front," "rear," "up," "down," "left," "right," "vertical," "horizontal," "inside," and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the device or component must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can mean fixed, detachable, or integral; mechanical or electrical; direct, indirect through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0026] An aircraft engine intake adapter connects between the cylinder head and carburetor. The cylinder head's intake duct has a roughly rectangular cross-section, while the carburetor's cross-section is circular. During operation, the mixed fuel and air produced by the carburetor enter the cylinder head's intake duct through the intake adapter.

[0027] Refer to the attached Figure 1-4 The intake transfer pipe has an upper end face 1 connected to the carburetor and a lower end face 2 connected to the cylinder head. A pair of connecting holes 4 and a variable-section intake duct 3 with an upper circular and lower bottom structure are provided between the upper end face 1 and the lower end face 2.

[0028] The intake transfer tube features a variable-section intake duct 3 with a circular upper and lower structure. The upper end surface 1 of the variable-section intake duct 3 is a circular duct with the same diameter as the carburetor's cross-sectional diameter. The lower end surface 2 of the variable-section intake duct 3 is a rectangular duct with the same cross-sectional shape as the cylinder head intake duct. Therefore, the variable-section intake duct 3 prevents abrupt changes in the flow rate of the fuel-air mixture, reducing the impact of turbulence and air resistance on intake efficiency and improving intake efficiency.

[0029] In addition, providing a separate intake transfer tube is not only beneficial to improving the versatility of the carburetor, but also beneficial to reducing the difficulty of manufacturing the carburetor.

[0030] In this embodiment, the carburetor is a vacuum membrane carburetor. During operation, the intake duct within the cylinder head is required to provide negative pressure for the carburetor. To improve the integration of the aircraft engine, a negative pressure hole 5 is provided between the upper end surface 1 and the lower end surface 2. One end of the negative pressure hole 5 is connected to the intake duct of the cylinder head, and the other end is connected to the vacuum membrane carburetor. During operation, negative pressure is provided to the vacuum membrane carburetor through the negative pressure hole 5.

[0031] To further improve the technical solution, a sink for placing a sealing ring is provided at one end of the negative pressure hole 5 located at the lower end surface 2. During assembly, placing a sealing ring in the sink can increase the sealing performance of the negative pressure hole 5 at the connection.

[0032] To further improve the technical solution, the variable-section intake duct 3 is disposed between a pair of connecting holes 4. The connecting holes 4 are used to insert bolts. The variable-section intake duct 3 is disposed between the pair of connecting holes 4. The carburetor and the intake transfer pipe can be fixed to the cylinder head through the bolt connection, and the sealing of the connection can be ensured.

[0033] In addition, the intake adapter can be made of nylon or nylon plus fiberglass, and injection molding can be used for manufacturing. Nylon material can reduce weight and improve the sealing performance of the connection between the carburetor and the cylinder head.

[0034] A further improvement to the technical solution is that the center of the circular air duct located on the upper end surface 1 of the variable-section intake duct 3 is eccentrically positioned relative to the center of the rectangular air duct located on the lower end surface 2 of the variable-section intake duct 3. The center of the circular air duct is located midway between the pair of connecting holes 4. The intake duct in the cylinder head is curved, and this eccentric positioning of the circular air duct's center relative to the rectangular air duct's center enables smooth communication between the variable-section intake duct 3 and the intake duct in the cylinder head, further reducing air resistance and improving intake efficiency.

[0035] Parts not described in detail are prior art. Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An aircraft engine intake adapter tube, connected between the cylinder head and the carburetor, characterized by: The intake transfer pipe has an upper end surface connected to the carburetor and a lower end surface connected to the cylinder head. A pair of connecting holes and a variable-section intake passage with an upper circular and lower bottom structure are provided between the upper and lower end surfaces.

2. The aircraft engine air intake adapter according to claim 1, characterized in that: The carburetor is a vacuum film carburetor; a negative pressure hole is also provided between the upper end surface and the lower end surface, one end of the negative pressure hole is connected to the intake duct of the cylinder head, and the other end is connected to the vacuum film carburetor, which is used to provide negative pressure to the vacuum film carburetor.

3. The aircraft engine air intake adapter according to claim 2, characterized in that: A sink for placing a sealing ring is provided at one end of the negative pressure hole located at the lower end surface.

4. The aircraft engine air intake adapter according to claim 1, characterized in that: The variable-section air inlet duct is arranged between a pair of connecting holes.

5. The aircraft engine air intake adapter according to claim 1, characterized in that: The center of the circular air duct located at the upper end surface of the variable-section air inlet duct is eccentrically arranged with respect to the center of the rectangular air duct located at the lower end surface of the variable-section air inlet duct.

6. The aircraft engine air intake adapter according to claim 5, characterized in that: The center of the circular airway is located in the middle of a pair of connecting holes.

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