An exhaust silencer for an internal combustion engine

Abstract

The utility model relates to an exhaust silencer of internal combustion engine, the silencer includes the silencer body, and the front end of silencer body is the air inlet, and the rear end of silencer body is the gas outlet, the silencer body still is equipped with the silencer fixed bolster, the air inlet, first silencer chamber, second silencer chamber, third silencer chamber, fourth silencer chamber, fifth silencer chamber, sixth silencer chamber, gas outlet are sequentially installed in the silencer body, and the sixth silencer chamber is located in the fifth silencer chamber, the utility model can solve the problem that the space size in car is limited and cannot normally arrange the silencer, the fixed structure of silencer and frame can solve the problem that the vertical arrangement of silencer is unstable, and additionally, increase rainproof structure at the tail mouth of silencer, can solve the problem that when internal combustion engine stops, rainwater fills into silencer through pipeline and flows to internal combustion engine and further leads to the problem of engine damage.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle engine exhaust emission purification technology and energy saving and consumption reduction technology, and specifically relates to an internal combustion engine exhaust muffler. Background Technology

[0002] To reduce the broadband noise generated by the high-temperature and high-pressure gases discharged from the internal combustion engine during operation, a muffler needs to be installed on the exhaust pipe. Currently, there are four types of mufflers: resistive, reactive, impedance composite, and active mufflers.

[0003] Existing internal combustion engine exhaust mufflers are generally located inside the vehicle, either under the chassis or in the engine compartment, and are fixed to the frame by a strap, with the tail end facing the rear or side of the vehicle. However, in some cases, due to the limitation of the interior space, the exhaust muffler cannot be located inside the vehicle.

[0004] If the exhaust muffler is located outside the vehicle and is vertically arranged, the original fixed structure cannot be used. However, the bottom connecting flange alone cannot effectively guarantee the vertical stability of the muffler. Moreover, with the muffler vertically arranged and the tail end facing upward, rainwater entering the muffler and flowing through the pipeline to the internal combustion engine can easily cause damage to the engine. Summary of the Invention

[0005] This utility model provides an exhaust muffler for an internal combustion engine, the purpose of which is to overcome the shortcomings of the prior art. It is arranged outside the vehicle, which can solve the problem of limited space inside the vehicle that makes it impossible to arrange the muffler normally. The fixing structure between the muffler and the vehicle frame can solve the problem of instability when the muffler is arranged vertically. In addition, the addition of a rainproof structure at the tail end of the muffler can solve the problem of rainwater entering the muffler and flowing into the internal combustion engine through the pipeline when the internal combustion engine is stopped, which can cause damage to the engine body.

[0006] The technical solution adopted in this utility model is as follows:

[0007] An internal combustion engine exhaust muffler includes a muffler body, with an air inlet at the front end and an air outlet at the rear end; a muffler mounting bracket is also installed on the muffler body.

[0008] The following components are installed sequentially within the muffler body: air inlet, first muffler chamber, second muffler chamber, third muffler chamber, fourth muffler chamber, fifth muffler chamber, sixth muffler chamber, and air outlet, with the sixth muffler chamber located within the fifth muffler chamber.

[0009] The first anechoic chamber, the second anechoic chamber, the third anechoic chamber, the fourth anechoic chamber, and the fifth anechoic chamber are all resistant anechoic structures with abrupt changes in cross-section;

[0010] The sixth anechoic chamber is a resistive anechoic structure. Airflow holes are opened on the side wall of the sixth anechoic chamber, and glass fiber is filled inside the sixth anechoic chamber.

[0011] A straight airflow passage is made in the partition between the second, third, and fourth anechoic chambers.

[0012] The two muffler mounting brackets are connected to the frame by bolts passing through corresponding connection holes. The connection hole on the first mounting bracket is a vertical elongated oval hole, and the connection hole on the second mounting bracket is a round hole. The opening method on the frame is as follows: the connection hole corresponding to the vertical elongated oval hole of the first mounting bracket is a round hole on the frame, and the round hole corresponding to the second mounting bracket is a horizontal elongated oval hole on the frame.

[0013] There is a first liner between the fixed bracket and the muffler body, and a second liner between the fixed bracket and the muffler body.

[0014] A rainproof structure is installed at the air outlet; the fixing frame of the rainproof structure is fixed on the air outlet, the pins are welded to the fixing frame on both sides, the rocker arm is hinged to the fixing frame with the pins as the hinge axis, and the end of the rocker arm is equipped with a rainproof cap.

[0015] Weight reduction holes are made on the rocker arm, and a counterweight is added to the other end of the rocker arm opposite the rain cap. Beneficial effects

[0016] 1. The muffler body adopts an impedance composite type, which can effectively reduce the wide-band exhaust noise of the internal combustion engine. By opening the airflow through hole between the muffler chambers, the exhaust resistance can be effectively reduced, so that the noise suppression and exhaust back pressure are balanced, and the airflow noise is reduced without affecting the engine working efficiency.

[0017] 2. The muffler fixing bracket structure can realize its vertical arrangement. One fixing bracket has a round hole and the other fixing bracket has an oblong hole, which facilitates assembly and prevents the muffler from moving. There are lining plates and partitions at the fixing brackets, which can effectively reduce the failure risk of the overall fixing structure and improve the stability of the muffler's vertical arrangement.

[0018] 3. The rainproof structure is designed to be open when the internal combustion engine is running and automatically close when the engine is stopped, effectively preventing rainwater from entering the muffler and flowing through the pipeline to the internal combustion engine, thus preventing damage to the engine.

[0019] 4. The muffler is located outside the vehicle and does not take up any interior space. Furthermore, the upward-facing and high exhaust outlet gives the vehicle good wading ability. Attached Figure Description

[0020] Figure 1 This is an appearance drawing of the present utility model;

[0021] Figure 2 This is a diagram of the internal structure of the muffler body;

[0022] Figure 3 This is a schematic diagram of the sixth anechoic chamber.

[0023] Figure 4 This is a schematic diagram of the fixed bracket;

[0024] Figure 5 This is a schematic diagram of a rainproof structure. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 As shown:

[0027] This utility model includes a muffler body 1, with an air inlet 111 at the front end and an air outlet 112 at the rear end. A muffler mounting bracket 2 is also installed on the muffler body 1. A rainproof structure 3 is installed at the air outlet 112.

[0028] like Figure 2 As shown:

[0029] The muffler body 1 is an impedance composite type. The following components are installed sequentially inside the muffler body 1: air inlet 111, first silencing chamber 11, second silencing chamber 12, third silencing chamber 13, fourth silencing chamber 14, fifth silencing chamber 15, sixth silencing chamber 16, and air outlet 112, wherein the sixth silencing chamber 16 is located inside the fifth silencing chamber 15.

[0030] Airflow enters through inlet 111, passes through first silencing chamber 11, second silencing chamber 12, third silencing chamber 13, fourth silencing chamber 14, fifth silencing chamber 15, and sixth silencing chamber 16, and exits through outlet 112, acoustically reflecting and dissipating the airflow noise, thereby reducing exhaust noise.

[0031] The first anechoic chamber 11, the second anechoic chamber 12, the third anechoic chamber 13, the fourth anechoic chamber 14, and the fifth anechoic chamber 15 are all resistive anechoic chambers. Through the resistive anechoic structure with abrupt changes in cross-section, an acoustic impedance mismatch is formed, reflecting part of the sound wave, which interferes with and cancels out the original sound wave, thereby achieving the purpose of reducing the low-frequency pulsating noise generated by the periodic discharge of high-pressure exhaust gas in the cylinder of the internal combustion engine.

[0032] like Figure 3 As shown:

[0033] The sixth anechoic chamber 16 is a resistive anechoic structure. Airflow holes 160 are opened on the side wall of the sixth anechoic chamber 16. The sixth anechoic chamber 16 is filled with glass fiber 161 that can withstand high temperature of 700℃. Airflow enters the sixth anechoic chamber 16 through the airflow holes 160. The friction between the glass fiber gaps converts sound energy into heat energy, thereby reducing the high-frequency airflow noise generated by friction between high-speed airflow and pipe and turbulence.

[0034] like Figure 1 As shown:

[0035] An airflow through-hole 10 is opened on the partition between the second silencing chamber 12, the third silencing chamber 13, and the fourth silencing chamber 14, which can effectively reduce exhaust resistance, balance noise suppression and exhaust back pressure, and achieve the goal of reducing airflow noise without affecting engine working efficiency.

[0036] like Figure 4 As shown:

[0037] The two muffler mounting brackets are connected to the vehicle frame by bolts passing through corresponding connection holes. The connection hole on the first mounting bracket 21 is a vertical elongated oval hole 210, and the connection hole on the second mounting bracket 22 is a round hole 220. The opening method on the vehicle frame is as follows: the connection hole corresponding to the vertical elongated oval hole 210 of the first mounting bracket 21 is a round hole on the vehicle frame, and the connection hole corresponding to the round hole 220 of the second mounting bracket 22 is a horizontal elongated oval hole on the vehicle frame. This ensures that the muffler cannot move up and down or left and right after the bolts are tightened, thus ensuring the vertical stability of the muffler.

[0038] There is a first liner 211 between the fixed bracket 1 and the muffler body 1, and a second liner 221 between the fixed bracket 2 and the muffler body 1. This can increase the stress area and reduce the tensile and shear stress on the surface of the cylinder. The first liner 211 is supported by a first muffler partition 212 at its center position, and the second liner 221 is supported by a second muffler partition 222 at its center position, so as to improve the rigidity of the fixed bracket and reduce the failure risk of the overall fixed structure.

[0039] like Figure 5 As shown:

[0040] The rainproof structure 3 consists of six parts: a rainproof cap 31, a rocker arm 32, a counterweight 34, a guide block 35, a pin 36, and a fixing frame 37. The fixing frame 37 is a certain distance away from the air outlet 112 and is fixed to the air outlet 112. The pin 36 is welded to the fixing frame 37 on both sides. The rocker arm 32 is hinged to the fixing frame 37 with the pin 36 as the hinge axis. The rainproof cap 31 is installed at the end of the rocker arm 32. In order to ensure that the rainproof cap 31 can automatically return to the closed state at the maximum opening angle, a weight reduction hole 33 is opened on the rocker arm 32 and a counterweight 34 is added to the other end of the rocker arm 32 relative to the rainproof cap 31. At the same time, in order to ensure that the rocker arm 32 does not deviate when rotating along the pin 36, two circular guide blocks 35 are added between the rocker arm 32 and the fixing frame 37.

[0041] When the internal combustion engine is working, airflow is output from the outlet 112 and the rain cap 31 is in the open state. When the internal combustion engine is stopped, no airflow is output from the outlet 112, and the rain cap 31 automatically closes the outlet 112 due to its own weight.

[0042] It has been verified that when the air flow rate is not less than 400 kg / h, the rain cap 31 rotates counterclockwise along the pin 36 to a maximum opening angle of 60°. When the air flow rate is less than 400 kg / h, the rain cap 31 rotates clockwise along the pin 36 to cover the air outlet 112.

[0043] The various embodiments described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above description of the disclosed embodiments enables those skilled in the art to implement or use this invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An internal combustion engine exhaust muffler, characterized in that: Includes a muffler body, with the front end of the muffler body being the air inlet and the rear end being the air outlet; the muffler body is also equipped with a muffler mounting bracket. The following components are installed sequentially within the muffler body: air inlet, first muffler chamber, second muffler chamber, third muffler chamber, fourth muffler chamber, fifth muffler chamber, sixth muffler chamber, and air outlet, with the sixth muffler chamber located within the fifth muffler chamber. The first anechoic chamber, the second anechoic chamber, the third anechoic chamber, the fourth anechoic chamber, and the fifth anechoic chamber are all resistant anechoic structures with abrupt changes in cross-section; The sixth anechoic chamber is a resistive anechoic structure. Airflow holes are opened on the side wall of the sixth anechoic chamber, and glass fiber is filled inside the sixth anechoic chamber. A straight airflow passage is made in the partition between the second, third, and fourth anechoic chambers.

2. The internal combustion engine exhaust muffler as described in claim 1, characterized in that: The muffler mounting bracket is connected to the vehicle frame by bolts passing through corresponding connection holes. The connection holes on the first mounting bracket are vertical elongated oval holes, and the connection holes on the second mounting bracket are round holes. The opening method on the vehicle frame is as follows: the connection hole corresponding to the vertical elongated oval hole of the first mounting bracket is a round hole on the vehicle frame, and the round hole corresponding to the second mounting bracket is a horizontal elongated oval hole on the vehicle frame.

3. The internal combustion engine exhaust muffler as described in claim 2, characterized in that: There is a first liner between the fixed bracket and the muffler body, and a second liner between the fixed bracket and the muffler body.

4. The internal combustion engine exhaust muffler as described in claim 1, characterized in that: A rainproof structure is installed at the air outlet; the fixing frame of the rainproof structure is fixed on the air outlet, the pins are welded to the fixing frame on both sides, the rocker arm is hinged to the fixing frame with the pins as the hinge axis, and the end of the rocker arm is equipped with a rainproof cap.

5. The internal combustion engine exhaust muffler as described in claim 4, characterized in that: Weight reduction holes are made on the rocker arm, and a counterweight is added to the other end of the rocker arm opposite the rain cap.

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