Box type silencing exhaust pipe structure for aviation two-cylinder engine

Abstract

The utility model relates to a box type silencing exhaust pipe structure for an aviation two-cylinder engine, which comprises an exhaust pipe upper end cover structure, an exhaust pipe lower end cover structure and a silencing body component, the upper end cover structure of the exhaust pipe comprises an upper end cover body, a group of air inlet interfaces arranged on two sides of the upper end of the upper end cover body, and an upper connecting screw hole group which is arranged at the edge of the lower opening end of the upper end cover body and is integrally designed with the upper end cover body, the exhaust pipe lower end cover structure comprises a lower end cover body and a lower connecting screw hole set which is arranged at the edge of the upper opening end of the lower end cover body and integrally designed with the lower end cover body, the lower connecting screw hole set and the upper connecting screw hole set are fixed through external bolts, and an upper silencing inner flow guide channel structure is arranged in the inner face of the upper end cover body. And the lower end cover body is internally provided with a silencing body assembly internally connected with a separation groove. According to the utility model, the integrated design is adopted, the structure is compact, the weight is light, the appearance size is small, the operation is simple, and the design scheme has certain universality.

Description

Technical Field

[0001] The utility model relates to an auxiliary accessory of an aviation two-cylinder engine, in particular to a box-type silencer exhaust pipe structure for the aviation two-cylinder engine. Background Art

[0002] The muffler exhaust pipe of an aviation two-cylinder engine is an important accessory that affects engine performance and noise. Its length and structure have a great impact on the engine.

[0003] The silencer exhaust pipe of an aviation two-cylinder engine is a component of the exhaust system of an aviation two-cylinder engine, and is responsible for exhaust. The general exhaust pipe often has a loud sound when exhausting, so a silencer exhaust pipe has appeared. However, the exhaust silencer device of this structure is complex and large in size, which cannot meet the requirements of reducing the weight and size of drones, and cannot meet people's use needs well. In view of the above situation, technical innovation is carried out on the basis of the existing box-type silencer exhaust pipe for aviation two-cylinder engines. Utility Model Content

[0004] The utility model aims to provide a box-type silencer exhaust pipe structure for an aviation two-cylinder engine, which is a box-type silencer exhaust pipe structure for an aviation two-cylinder engine with low noise, low fuel consumption and light weight.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a box-type silencer exhaust pipe structure for an aviation two-cylinder engine, comprising an exhaust pipe upper end cover structure, an exhaust pipe lower end cover structure and a silencer body assembly, the exhaust pipe upper end cover structure comprising an upper end cover body, a group of air intake interfaces arranged on both sides of the upper end of the upper end cover body, an upper connecting screw hole group arranged at the edge of the lower end of the upper end cover body and designed as an integral part with the upper end cover body, the exhaust pipe lower end cover structure comprising a lower end cover body, a lower connecting screw hole group arranged at the edge of the upper end of the lower end cover body and designed as an integral part with the lower end cover body, the lower connecting screw hole group and the upper connecting screw hole group are fixed by external bolts, an upper silencer inner guide channel structure is arranged in the inner surface of the upper end cover body, and a silencer body assembly inner partition groove is arranged in the lower end cover body.

[0006] The silencer assembly includes a silencer baffle and a group of silencer honeycomb blocks. The silencer baffle is arranged on the inner surface of the upper end cover and fixed by internal bolts. The silencer honeycomb blocks are arranged on the inner surface of the lower end cover and are connected to the internal dividing oblique groove of the silencer assembly.

[0007] The muffler honeycomb block is fan-shaped, and positioning screw holes are set through the center points of both ends. The positioning screw holes are set with lower component bolts and fixed to the lower end cover body. The muffler baffle is set with a muffler hole group at the small round end of the muffler honeycomb block.

[0008] The upper silencer inner guide channel structure includes an upper end dividing groove arranged inside the upper end cover body, and each silencer inner guide channel body is arranged outside the upper end oblique dividing groove. The silencer inner guide channel body is composed of two folded sound guide platforms, and two folded sound slope platforms are arranged at intervals at the entrance end of each folded sound guide platform, and a reverse folded sound slope platform is arranged at the outlet end of each folded sound guide platform.

[0009] An upper fixing seat body is arranged at the middle position of the upper end of the upper cover body.

[0010] The beneficial effects of the utility model are as follows: the utility model arranges a silencer assembly in the upper and lower end covers and an upper silencer inner guide channel structure in the upper end cover; changes the airflow direction and makes the airflow pass through the contracting and expanding end faces for multiple times, so that the air is mixed after divergence, reduces the density differences in the airflow, achieves uniform mixing, consumes the energy of the sound waves in the airflow, attenuates the airflow pressure with different densities caused by pressure during exhaust, reduces the propagation path of the longitudinal wave, and thus reduces the exhaust noise; and adopts a centralized design, has a compact structure, is light in weight, has a small size, is simple to operate, and the design scheme has certain versatility.

[0011] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model.

[0013] Figure 2 This is a diagram of the internal structure of the upper end cover of the utility model.

[0014] Figure 3 This is a diagram of the internal structure of the lower end cover of the utility model.

[0015] Figure 4 It is a structural diagram of the sound-absorbing partition in the utility model.

[0016] In the figure: 1. upper end cover, 2. air inlet interface, 3. upper connecting screw hole group, 4. lower end cover, 5. lower connecting screw hole group, 6. external bolts, 7. internal separation groove of silencer assembly, 8. silencer baffle, 9. silencer honeycomb block, 10. internal bolts, 11. internal separation oblique groove of silencer assembly, 12. positioning screw holes, 13. lower component bolts, 14. silencer hole group, 15. upper end separation groove, 16. folded sound guide platform, 17. folded sound slope platform, 18. reverse folded sound slope platform, 19. upper fixed seat, 20. gasket. DETAILED DESCRIPTION

[0017] The directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like in the application text are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" 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 an indirect connection 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.

[0019] Embodiment 1, as Figure 1-4 As shown, a box-type silencer exhaust pipe structure for an aviation two-cylinder engine includes an exhaust pipe upper end cover structure, an exhaust pipe lower end cover structure and a silencer assembly, wherein the exhaust pipe upper end cover structure includes an upper end cover body 1, a group of air intake interfaces 2 arranged on both sides of the upper end of the upper end cover body, each air intake interface 2 is equipped with a gasket 20, and an upper connecting screw hole group 3 designed integrally with the upper end cover body is arranged at the edge of the lower end of the upper end cover body, the exhaust pipe lower end cover structure includes a lower end cover body 4, a lower connecting screw hole group 5 designed integrally with the lower end cover body at the edge of the upper end of the lower end cover body, the lower connecting screw hole group is fixed to the upper connecting screw hole group by external bolts 6, an upper silencer inner guide channel structure is arranged in the inner surface of the upper end cover body, and a silencer assembly internal partition groove 7 is arranged in the lower end cover body.

[0020] The silencer assembly includes a silencer baffle 8 and a group of silencer honeycomb blocks 9. The silencer baffle is arranged on the inner surface of the upper end cover and fixed by internal bolts 10. The silencer honeycomb blocks are arranged on the inner surface of the lower end cover and are connected to the internal dividing oblique grooves 11 of the silencer assembly.

[0021] The muffler honeycomb block 9 is fan-shaped, and positioning screw holes 12 are set through the center points of both ends, and the positioning screw holes are set with lower component bolts 13 to fix with the lower end cover 4, and the muffler baffle 8 is set with a muffler hole group 14 at the small round end of the muffler honeycomb block. The muffler honeycomb block 9 adopts the acoustic principle. The honeycomb shape increases the contact area of ​​the airflow when it flows, absorbs the energy therein, and thus reduces the noise.

[0022] The upper silencer inner guide channel structure includes an upper dividing groove 15 arranged inside the upper end cover body 1, and each silencer inner guide channel body arranged outside the upper oblique dividing groove. The silencer inner guide channel body is composed of two folded sound guide platforms 16, and two folded sound slope platforms 17 are arranged at intervals at the entrance end of each folded sound guide platform, and a reverse folded sound slope platform 18 is arranged at the outlet end of each folded sound guide platform.

[0023] An upper fixing seat 19 is arranged at the middle position of the upper end of the upper cover body.

[0024] The upper end cover 1 is used in conjunction with the engine exhaust hole to discharge exhaust gas. The upper end cover 1 and the engine body are sealed with a gasket 20 and then fixed to the engine body with bolts, wherein the gasket plays a sealing role. An upper silencer inner guide channel structure is designed inside the upper end cover. The design of the upper silencer inner guide channel structure needs to conform to the exhaust flow resonance characteristics. In addition, in order to achieve the silencing effect, the upper silencer inner guide channel structure needs to be designed diagonally with the exhaust hole as much as possible to lengthen the exhaust flow time in the exhaust pipe. The lower end cover 4 discharges the exhaust gas into the atmosphere and is used to assist in fixing the silencer baffle 8. The silencer baffle is punched with a silencer hole group 14 and assembled with the upper end cover 1 to form a guide groove for the exhaust gas flow field, so that the exhaust gas flows according to the designed flow field. The size and number of the silencer holes need to be determined on the basis of theoretical analysis and actual test on the engine.

[0025] The utility model arranges silencer body components in the upper and lower end covers and arranges an upper silencer inner guide channel structure in the upper end cover; changes the airflow direction and makes the airflow pass through the contracted and expanded end faces for multiple times, so that the air is mixed after divergence, reduces the density difference in the airflow, realizes uniform mixing, consumes the energy of the sound waves in the airflow, attenuates the airflow pressure of different densities caused by pressure during exhaust, reduces the propagation path of the longitudinal wave, and thus reduces the exhaust noise; and adopts a centralized design, has a compact structure, is light in weight, has a small size, is simple to operate, and the design scheme has certain versatility.

[0026] The above embodiments are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present invention.

[0027] The parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art.

Claims

1. A box-type silencer exhaust pipe structure for an aviation two-cylinder engine, comprising an exhaust pipe upper end cover structure, an exhaust pipe lower end cover structure and a silencer assembly, characterized in that: The exhaust pipe upper end cover structure comprises an upper end cover body, a group of air inlet interfaces arranged on both sides of the upper end of the upper end cover body, an upper connecting screw hole group arranged at the edge of the lower end of the upper end cover body and designed as a whole with the upper end cover body, the exhaust pipe lower end cover structure comprises a lower end cover body, a lower connecting screw hole group arranged at the edge of the upper end of the lower end cover body and designed as a whole with the lower end cover body, the lower connecting screw hole group and the upper connecting screw hole group are fixed by external bolts, an upper silencer inner guide channel structure is arranged in the inner surface of the upper end cover body, and a silencer assembly internal connecting partition groove is arranged in the lower end cover body; the upper silencer inner guide channel structure comprises an upper end partition groove arranged in the inner part of the upper end cover body, and silencer inner guide channels arranged outside the upper oblique partition groove, and the silencer inner guide channels are composed of two folded sound guide platforms, two folded sound slope platforms are arranged at intervals at the entrance end of each folded sound guide platform, and a reverse folded sound slope platform is arranged at the outlet end of each folded sound guide platform.

2. The box-type silencer exhaust pipe structure for a two-cylinder aircraft engine according to claim 1, characterized in that: The silencer assembly includes a silencer baffle and a group of silencer honeycomb blocks. The silencer baffle is arranged on the inner surface of the upper end cover and fixed by internal bolts. The silencer honeycomb blocks are arranged on the inner surface of the lower end cover and are connected to the internal dividing oblique groove of the silencer assembly.

3. The box-type silencer exhaust pipe structure for a two-cylinder aircraft engine as claimed in claim 2, characterized in that: The muffler honeycomb block is fan-shaped, and positioning screw holes are set through the center points of both ends. The positioning screw holes are set with lower component bolts and fixed to the lower end cover body. The muffler baffle is set with a muffler hole group at the small round end of the muffler honeycomb block.

4. The box-type silencer exhaust pipe structure for a two-cylinder aircraft engine according to claim 1, characterized in that: An upper fixing seat body is arranged at the middle position of the upper end of the upper cover body.

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