Silencer for exhaust system of two-stroke engine
By designing a muffler structure that includes an exhaust inlet, flow path, and bypass channel, the exhaust noise problem of two-stroke engines is solved, noise suppression and efficiency improvement are achieved, and it is suitable for UAV engines.
Patent Information
- Application Number
- CN202423098166.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-12-16
AI Technical Summary
Two-stroke engines produce significant noise during operation, and existing technologies have difficulty in effectively suppressing engine exhaust noise, especially in UAV applications, where it is difficult to meet regulatory requirements.
A muffler is designed, which includes an exhaust inlet and outlet, two exhaust flow paths and a bypass channel. Through the series fluid connection of adjacent flow channels and the partition design, fluid pressure balance is promoted and exhaust gas vibration and energy are weakened. An elliptical exhaust flow path and outer shell combined structure is adopted.
It effectively reduces the noise during engine exhaust, improves engine efficiency and performance, and meets the noise regulations for UAV engines.
Smart Images
Figure CN223359205U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a muffler used for a two-stroke engine, and aims to reduce the emission of engine noise. Background Art
[0002] Two-stroke engines generate significant noise during operation. This noise originates from the propagation of nuclear radiation from the acoustic pulses generated by the airflow during combustion. Two-stroke engines are currently used in a wide range of applications, placing increasing demands on these engines. This is particularly true for engines used in UAVs, which are required to meet noise levels specified by certain regulations and standards. Therefore, it is necessary to control engine exhaust noise by suppressing the acoustic pulses generated during operation.
[0003] In order to make the muffler suitable for two-stroke engines, the structure of the muffler can be carefully designed so that when the engine is working, the sound pulses of the exhaust gas will be reflected, collided and expanded, and the sound waves will propagate back and forth in the cavity, thereby weakening the vibration and energy, and effectively reducing the noise generated by the engine during the exhaust process. Summary of the Invention
[0004] To address the above-mentioned problems, the present invention aims to provide a muffler for a two-stroke engine. The muffler includes an exhaust inlet and an exhaust outlet, with two exhaust flow paths between the exhaust inlet and the exhaust outlet. The exhaust flow path includes two adjacent flow channels, wherein two of the adjacent flow channels are fluidically connected in series so that exhaust gas can flow from one flow channel to the other flow channel along the exhaust flow path. The adjacent flow channels are configured for fluid to flow in opposite directions along them. A bypass channel is provided between the two adjacent flow channels for further connecting the two flow channels and promoting pressure equalization of the fluids within the two channels.
[0005] The exhaust flow path is symmetrically distributed with the exhaust inlet as the center, and the exhaust flow path is in an elliptical shape, which is more suitable for the flow of gas.
[0006] Two of the adjacent flow channels are fluidically connected in series, a partition is provided between the adjacent flow channels, and the partition is provided with two circular bypass channels.
[0007] The bypass channel is arranged in a lateral direction of the gas flow channel and leads to an adjacent flow channel.
[0008] The muffler is composed of an upper and a lower outer shell, and the exhaust flow path is formed by combining a first shell and a second shell. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 This is the general assembly drawing of the utility model;
[0010] In the picture:
[0011] 11-first part of the shell; 12-second part of the shell.
[0012] Figure 2 This is a structural diagram of the muffler of the present utility model;
[0013] In the picture:
[0014] 10 - muffler; 21 - exhaust inlet; 22 - exhaust outlet; 30 - exhaust flow path; 31 - flow channel; 40 - bypass channel.
[0015] Figure 3 This is the axial view of the first part of the housing of the utility model.
[0016] Figure 4 This is the axial view of the second part of the housing of the utility model. DETAILED DESCRIPTION
[0017] The structure of the present invention is further described below with reference to the accompanying drawings:
[0018] like Figure 1 The figure shows the assembly of the utility model, which includes a first housing portion (11), a second housing portion (12) and a plurality of fastening screws.
[0019] The first partial shell (11) is combined with the second partial shell (12) and fastened by a plurality of fastening screws evenly distributed around the periphery.
[0020] like Figure 2 The figure shows the internal structure of the muffler of the present invention, which includes an exhaust inlet (21), an exhaust outlet (22), an exhaust flow path (30), a flow channel (31) and a bypass channel (40). Two exhaust flow paths (30) are included between the exhaust inlet (21) and the exhaust outlet (22), and the exhaust flow path (30) includes two flow channels (31), wherein two adjacent flow channels (31) are fluidically connected in series.
[0021] A partition is provided between the adjacent flow channels (31), and a bypass channel (40) is provided on each of the partitions for further connecting the two flow channels (31).
[0022] Working principle:
[0023] After the engine starts working, the exhaust gas begins to enter the muffler and is discharged to the outside, which promotes more fresh air to enter the engine working cycle and reduces the energy and noise generated by exhaust gas emission, thereby improving the efficiency and performance of the engine.
[0024] After the engine starts working, the working cycle begins. When the piston moves upward from the bottom dead center, the exhaust gas gradually flows from the exhaust inlet (21) into the muffler. After entering the muffler, the exhaust gas flows along two exhaust flow paths (30). The vast majority of the exhaust gas flows from the flow channel (31) to the adjacent flow channel (31), and a very small portion of the exhaust gas flows through the bypass channel (40) to the adjacent flow channel (31). The exhaust gas that passes through the flow channel finally flows to the exhaust outlet (22) and is discharged to the outside.
[0025] The utility model muffler weakens the vibration and energy generated by the exhaust gas through the careful design of the internal structure of the muffler, and effectively reduces the noise generated by the engine during the exhaust process.
Claims
1. A muffler for an exhaust system of a two-stroke engine, the muffler comprising an exhaust inlet and an exhaust outlet, two exhaust flow paths between the exhaust inlet and the exhaust outlet, the exhaust flow path comprising two adjacent flow channels, wherein two of the adjacent flow channels are fluidically connected in series so that exhaust gas can flow from one flow channel to the other flow channel along the exhaust flow path, the adjacent flow channels being configured for fluid to flow in opposite directions therethrough, a bypass channel being provided between the two adjacent flow channels for further connecting the two flow channels and promoting pressure equalization of the fluids in the two channels. 2 . The muffler according to claim 1 , wherein the exhaust flow path is symmetrically distributed with the exhaust inlet as the center.
3. The muffler according to claim 1 or 2, wherein the exhaust flow path is elliptical in shape, which is more suitable for the flow of gas.
4. The muffler according to claim 1, wherein two of the adjacent flow channels are fluidly connected in series, a partition is provided between the adjacent flow channels, and the partition is provided with a bypass channel.
5. The muffler according to claim 1 or 4, wherein the bypass channel is provided in a lateral direction of the gas flow channel and leads to an adjacent flow channel.