CN201050396Y - Vehicular silencer - Google Patents

Abstract

Disclosed is a muffler for vehicle, which comprises a shell (1), an air inlet pipe (4) and an air outlet pipe (5). Wherein, the utility model also comprises at least one baffle (2), a resonance tube (6) and a control valve (8). The outer edge of the at least one baffle (2) is connected closely with the inner wall of the shell (1); the inner part of the shell (1) is divided into at least two chambers (3) which are not communicated with each other; the air inlet pipe (4) is inserted into the shell (1) from one end of the shell (1); the air outlet pipe (5) is inserted into the shell (1) from the other end of the shell (1); via holes are arranged in circumferential direction on the pipe body of the air inlet pipe (4) arranged in the chamber in which the port of the air outlet pipe (5) is arranged; the control valve (8) seals a port (6A) at one end of the resonance tube (6) through an eccentric compression part. According to the air displacement, the utility model can adjust automatically the area of the air passing, so as to adapt to the different working conditions of the engine, increase the muffling effect and decrease the displacement back pressure.

Description

muffler for vehicle

technical field

The utility model relates to a vehicle muffler, in particular to an engine exhaust muffler.

Background technique

The general exhaust muffler usually achieves the purpose of noise reduction through structural features. The exhaust pipe is a long pipe, which is continuously winding and then encapsulated by the shell; because the exhaust pipe is a long round pipe, it cannot be bent too large (easy to crack), so it must be welded with elbows at the bends, the design is complicated, and the processing hours are also many, and the complicated internal structure will make the airflow unobstructed, greatly increasing the exhaust back pressure, thereby increasing the power of the powertrain loss.

For this reason, CN2871858 discloses a kind of automobile muffler, is made up of cylinder body, three dividing plates, air intake pipe, air outlet pipe and front and rear end caps. The partition divides the cylinder into four chambers. The air inlet pipe extends from one end of the cylinder and stops through the first, second and third chambers. The outlet pipe starts from the first chamber and passes through the second, third and third chambers. After the four chambers are connected, there are a certain number of micropores on the inlet pipe, the outlet pipe and the partition plate, so that the first, second and third chambers form a resonance chamber, and the fourth chamber is filled with suction. Acoustic cotton forms an anechoic chamber, and at the same time, an anechoic sleeve surrounds the outer periphery of the middle and rear section of the outlet pipe. The gas enters from the inlet pipe, flows between the chambers through the inlet pipe, the outlet pipe and the micro-holes on the partition, and finally discharges from the exhaust pipe. Although the muffler makes the flow of the exhaust gas flow in the muffler cavity smoother and can reduce the exhaust back pressure to a certain extent, when the engine speed increases or the exhaust volume increases, the output power and exhaust characteristics must be satisfied. According to the requirements of the requirements, it is necessary to increase the passage area of the air flow, but the area of the air flow in the muffler is always the same, which will reduce the noise reduction effect and increase the exhaust back pressure.

Utility model content

The purpose of this utility model is to overcome the shortcomings of the prior art that the area of the air flow in the muffler is always constant, and when the exhaust volume increases, the muffler effect will be reduced and the exhaust back pressure will be increased, and a semi-active muffler can be provided. According to the size of the exhaust volume, the area through which the airflow passes is automatically adjusted, so as to adapt to different working conditions of the engine, improve the noise reduction effect and reduce the exhaust back pressure.

The utility model provides a vehicle muffler, the vehicle muffler includes a housing 1, an intake pipe 4 and an outlet pipe 5; wherein, the vehicle muffler also includes at least one partition 2, a resonance tube 6 and a control valve 8 The outer edge of the at least one partition 2 is airtightly connected with the inner wall of the housing 1, and the inside of the housing 1 is divided into at least two chambers 3 that are not communicated with each other; 1 is inserted at one end, and passes through at least one chamber 3, and at least extends to the next chamber 3; the outlet pipe 5 is inserted from the other end of the housing 1, and passes through at least one chamber 3, and at least extends to the next chamber 3; the port of the air inlet pipe 4 located in the housing and the port of the air outlet pipe 5 located in the housing are not in the same chamber, and at least part of the air inlet pipe 4 and the air outlet pipe 5 are located in the same chamber; the chamber where the port of the air outlet pipe 5 is located The circumferential direction of the inlet pipe 4 in the pipe body is provided with through holes; one end of the resonance pipe 6 is located in the chamber where the inlet pipe 4 port is located, and the other end is located in the chamber where the outlet pipe 5 port is located; the control valve 8 passes through The biasing element closes off the resonant tube 6 port 6A located in the chamber where the outlet tube 5 port is located.

In the vehicle muffler provided by the utility model, the control valve 8 can change its open or closed state according to the rotational speed of the engine. When the engine speed is low, the exhaust gas flow cannot rush open the control valve 8, and the control valve 8 continues to close the resonance tube 6 under the action of the biasing element. At this time, the chamber where the port of the intake pipe 4 is located and the resonance tube form a closed joint. The cavity, which is equivalent to a Helmholtz muffler, can filter the low- and medium-frequency noise of the exhaust very well, and the noise reduction effect is good. When the engine speed is high, the exhaust gas flow overcomes the force of the biasing element, the control valve 8 is opened, the gas flow can circulate through the resonance tube 6 and enter the outlet pipe 5, and the exhaust flow resistance is reduced, so the power loss is reduced. After the control valve 8 is opened, the exhaust noise generated by the combustion of the engine in the tailpipe increases, but the air resistance decreases, and the noise generated by airflow friction also decreases relatively. At high speeds, the friction noise of the gas is the main source of exhaust noise. components, so the total noise level is reduced instead. Therefore, the muffler provided by the utility model controls the valve switch through the engine exhaust airflow, and can automatically adjust the airflow passing area according to the exhaust volume, thereby adapting to different working conditions of the engine, and solving the problem that the airflow passing area in the muffler is always constant , When the engine displacement increases, the noise reduction effect will be reduced and the exhaust back pressure will be increased.

Description of drawings

Fig. 1 and Fig. 8 are the structural representations of the muffler provided by the utility model;

Fig. 2 is the installation schematic diagram of the control valve of the muffler provided by the utility model;

Fig. 3 is a schematic diagram of the air flow state of the muffler provided by the utility model when the engine is at a low speed;

Fig. 4 is a schematic diagram of the air flow state of the muffler provided by the utility model at high engine speed;

Fig. 5 is the noise curve of the muffler provided by the utility model in the valve opening and closing state;

Fig. 6 is the pressure curve of the muffler provided by the utility model in the valve opening and closing state;

Fig. 7 is a cross-sectional view of a resistive tank.

Detailed ways

Preferred embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, a vehicle muffler provided by the utility model includes a housing 1, an air inlet pipe 4 and an air outlet pipe 5; Pipe 6 and control valve 8; the outer edge of the at least one partition 2 is airtightly connected with the inner wall of the housing 1, and divides the interior of the housing 1 into at least two chambers 3 that are not communicated with each other; the The air inlet pipe 4 is inserted from one end of the housing 1, and passes through at least one chamber 3, and at least extends to the next chamber 3; the air outlet pipe 5 is inserted from the other end of the housing 1, and passes through at least one chamber 3, at least Extend to the next chamber 3; the inlet pipe 4 port located in the housing and the outlet pipe 5 port located in the housing are not in the same chamber, and the inlet pipe 4 and the outlet pipe 5 are at least partly located in the same chamber; located in the outlet pipe The inlet pipe 4 in the chamber where the port 5 is located is provided with through holes in the circumferential direction; one end of the resonance pipe 6 is located in the chamber where the inlet pipe 4 port is located, and the other end is located in the chamber where the outlet pipe 5 port is located; The control valve 8 closes the port 6A of the resonant tube 6 located in the chamber where the port of the outlet tube 5 is located by means of a biasing element.

The muffler provided by the utility model controls the valve switch through the exhaust airflow of the engine, and can automatically adjust the airflow passing area according to the exhaust volume, so as to adapt to different working conditions of the engine, and solve the problem that the airflow passing area in the muffler is always constant. When the engine displacement increases, the noise reduction effect will be reduced and the exhaust back pressure will be increased.

The opening and closing of the control valve 8 is controlled by a biasing element in a manner known in the art. As a specific embodiment, the control valve 8 includes a pin shaft 8A fixed in the housing 1 and a pin shaft connected to the pin shaft 8A. The valve 8B closes the port 6A of the resonant tube 6 located in the chamber where the port of the outlet tube 5 is located through the biasing element. The biasing element may be various biasing elements known in the art, such as a coil spring.

Fig. 2 is a schematic diagram of the installation arrangement of the control valve, in which the end cover of the housing 1 is not shown in the drawing. A biasing element (not shown) is provided in the pin shaft 8A, and the biasing element controls the valve 8B in a manner known in the art, so that the valve 8B closes the resonant tube 6 located in the chamber where the port of the air outlet tube 5 is located. Port 6A.

When the engine rotates at low and medium speeds, the exhaust air flow is small, and the state of the exhaust air flow is shown in Figure 3. The air flow enters from the air inlet pipe 4, passes through the through holes arranged in the circumferential direction of the pipe body, and then enters the air outlet pipe 5 to be discharged. At this time, because the engine speed is low, the exhaust gas flow cannot open the valve 8B, and the valve 8B continues to close the resonance tube 6 under the spring. At this time, the chamber where the port of the intake pipe 4 is located and the resonance tube form a closed cavity together. Its function is equivalent to a Helmholtz muffler, which can filter the low- and medium-frequency noise of the exhaust very well, and the noise reduction effect is good.

As the engine speed increases, the exhaust air flow gradually overcomes the spring force, and the valve 8B begins to open. When a certain speed is reached, the valve is fully opened, and the exhaust air flow state is shown in Figure 4. At this stage, the airflow can circulate through the resonant tube 6 and enter the outlet pipe 5, and the exhaust flow resistance is reduced, so the power loss is reduced. After the valve 8B is opened, the exhaust noise generated by engine combustion in the tailpipe increases, but the air resistance decreases, and the noise generated by airflow friction also decreases relatively. At high speeds, the friction noise of the gas is the main component of the exhaust noise , so the total noise is reduced instead.

Fig. 5 and Fig. 6 are respectively the noise curve and the pressure curve when the valve is closed and opened after the muffler of the utility model is adopted in the exhaust system. It can be seen from the figure that when the engine speed is low, if the valve is closed, the noise is low, and when the engine speed is high, if the valve is opened, the noise is low, and the exhaust back pressure also drops a lot. Therefore, the utility model closes the valve at low speed, and opens the valve at high speed, so that it can adapt to different working conditions of the engine, effectively improve the noise reduction effect, and reduce the exhaust back pressure.

The turning point of the engine speed for controlling the opening and closing of the valve can be flexibly designed by changing the stiffness of the biasing element. Since the highest safe and stable speed of gasoline piston engines is basically around 6000r/min, the turning point of this speed is generally set to the middle speed of the engine at 3000±50r/min.

According to the present utility model, preferably, the outlet pipe 5 is wrapped with a resistive tank 7 on the outside of the tube body part inserted into the first chamber of the housing 1, and the resistive tank 7 is built with a resistive sound-absorbing material 9. FIG. 7 is a cross-sectional view of the resistance tank 7 . Therefore, the high-frequency noise of the exhaust gas can be further effectively filtered through the resistive noise reduction.

According to the present utility model, preferably, as shown in FIG. 1 , the outlet pipe 5 is located in the port body part of the chamber, the inlet pipe 4 is located in the port body part of the chamber, and the resonance pipe 6 is located in the chamber. In the port body part in the chamber where the inlet pipe 4 port is located and in the non-port body part of the inlet pipe 4 and the non-port body part of the outlet pipe 5 in the same chamber, at least a part of the circumference is provided with through holes . Since the air flow can pass through the circumferentially arranged through-holes of this part of the pipe body, the flow area of the air flow is increased, so that the effect of decompression and noise reduction can be further achieved.

In the utility model, the size of each chamber in the housing 1 can be coordinated so that the entire muffler is reasonably stable. Preferably, the volume of the chamber where the inlet pipe 4 port is located accounts for 1/3 to 1 of the total volume of the housing 1. /4, so that when the valve 8B is closed, the noise reduction effect of the closed cavity formed by the chamber where the port of the intake pipe 4 is located and the resonance pipe can be improved.

According to the utility model, preferably, the ratio of the pipe body diameters of the air inlet pipe 4, the air outlet pipe 5 and the resonance pipe 6 is 1: 0.5-2: 0.5-2, and preferably, each of the air inlet pipe 4 and the air outlet pipe 5 In the pipe body with a through hole in each section, the total area of the through hole accounts for 1/5 to 1/4 of the total surface area of the outer surface of each section of the pipe, thereby optimizing the noise reduction effect of the muffler. The size of the through hole only needs to meet the requirements of the actual exhaust pressure, and the diameter of the through hole is preferably 2mm-15mm, more preferably 5mm-10mm.

According to the utility model, those skilled in the art can easily think of increasing or decreasing the number of partitions according to the actual situation, so as to optimize the noise reduction effect of the muffler. Increasing the number of partitions can strengthen the support to the intake pipe 4, the outlet pipe 5 and the resonance pipe 6, thereby improving the stability of the muffler structure, and further improving the muffler effect of the vehicle muffler provided by the utility model; while reducing the number of partitions The number can simplify the structure of the muffler and reduce the weight of the muffler. Usually, the number of the separators 2 can be 1-10, preferably 1-5.

In the embodiment shown in Figure 1, the number of the partitions 2 is one, and the outer edge of the one partition 2 is airtightly connected with the inner wall of the housing 1, and the inside of the housing 1 Separated into two chambers 3 that are not connected to each other; the air inlet pipe 4 is inserted from one end of the housing 1, and passes through one chamber 3, and extends to the next chamber 3; the air outlet pipe 5 is from the other end of the housing 1 Insert, and pass through a chamber 3, and extend to the next chamber 3; The inlet pipe 4 pipe body in the chamber where the outlet pipe 5 port is located has through holes; one end of the resonance pipe 6 is located at the inlet In the chamber where the port of the air pipe 4 is located, the other end is located in the chamber where the port of the air outlet pipe 5 is located; the control valve 8 closes the port 6A of the resonant tube 6 located in the chamber where the port of the air outlet pipe 5 is located through a biasing element.

In the embodiment shown in Figure 8, the number of the partitions 2 is two, and the outer edges of the two partitions 2 are airtightly connected with the inner wall of the housing 1, and the housing 1 The interior of the housing is divided into three chambers 3 that are not connected to each other; the air inlet pipe 4 is inserted from one end of the housing 1, passes through at least one chamber 3, and at least extends to the next chamber 3, as a specific implementation For example, the port passes through two chambers 3 and extends to the third chamber 3 counted from the insertion end of the inlet pipe 4; the outlet pipe 5 is inserted from the other end of the housing 1 and passes through at least one chamber 3, At least extend to the next chamber 3, as a specific embodiment, the port passes through the two chambers 3, and extends to the third chamber 3 from the insertion end of the air outlet pipe 5; located at the port of the air outlet pipe 5 The circumference of the inlet pipe 4 pipe body in the chamber where it is located is provided with through holes; one end of the resonance pipe 6 is located in the chamber where the inlet pipe 4 ports are located, and the other end is located in the chamber where the outlet pipe 5 ports are located; The control valve 8 closes the resonant tube 6 port 6A located in the chamber where the outlet tube 5 port is located by means of a biasing element.

Claims (8)

1. silencer for automobile, this silencer for automobile comprises housing (1), suction tude (4) and steam outlet pipe (5); It is characterized in that described silencer for automobile also comprises at least one dividing plate (2), resonatron (6) and control valve (8); The airtight connection of inwall of the outer rim of described at least one dividing plate (2) and described housing (1), and the inside of housing (1) is divided into disconnected at least two chambers (3) mutually; Described suction tude (4) is inserted from housing (1) one end, and passes at least one chamber (3), extends at least in the next chamber (3); Steam outlet pipe (5) inserts from housing (1) the other end, and passes at least one chamber (3), extends at least in the next chamber (3); Steam outlet pipe (5) port that is positioned at suction tude (4) port of housing and is positioned at housing is not at same chamber, and suction tude (4) is arranged in same chamber with steam outlet pipe (5) at least a portion; Be arranged in steam outlet pipe (5) port place chamber suction tude (4) body circumferentially be furnished with through hole; One end of resonatron (6) is arranged in the chamber at suction tude (4) port place, and the other end is arranged in the chamber at steam outlet pipe (5) port place; Described control valve (8) is arranged in resonatron (6) port (6A) of the chamber at steam outlet pipe (5) port place by the biasing element sealing.

2. silencer for automobile according to claim 1, it is characterized in that, described control valve (8) comprises bearing pin (8A) and the pivotally connected valve (8B) on bearing pin (8A) that is fixed in the housing (1), and described valve (8B) is arranged in resonatron (6) port (6A) of the chamber at steam outlet pipe (5) port place by described biasing element sealing.

3. silencer for automobile according to claim 1 is characterized in that, the outside of the body portion of steam outlet pipe (5) in first chamber of its insertion housing (1) is surrounded by resistive jar (7), and described resistive jar (7) are built-in with resistive quieter material.

4. silencer for automobile according to claim 1, it is characterized in that, described steam outlet pipe (5) be arranged in port tube body portion, resonatron (6) that the port tube body portion of chamber, described suction tude (4) be arranged in chamber be arranged in suction tude (4) port place chamber the port tube body portion and be arranged in the non-port body of suction tude (4) and the non-port tube body portion of steam outlet pipe (5) of same chamber, what have a part at least circumferentially is furnished with through hole.

5. silencer for automobile according to claim 1 is characterized in that, the chamber volume at suction tude (4) port place account for housing (1) total volume 1/3 to 1/4.

6. silencer for automobile according to claim 1 is characterized in that, the ratio of the pipe diameter of suction tude (4), steam outlet pipe (5) and resonatron (6) is 1: 0.5-2: 0.5-2.

7. silencer for automobile according to claim 1 is characterized in that, suction tude (4) and steam outlet pipe (5) every section has in the body of through hole, and the through hole gross area accounts for 1/5 to 1/4 of every section outer surface of tube body gross area.

8. silencer for automobile according to claim 1 is characterized in that, the number of described dividing plate (2) is 1-5.

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