CN211777651U - Exhaust silencer - Google Patents

Abstract

The utility model relates to the technical field of exhaust mufflers, in particular to an exhaust muffler, comprising an exhaust pipe and a casing sleeved on the outside of the exhaust pipe; the exhaust pipe and the casing are arranged coaxially, and the exhaust pipe The length of the pipe along the axis direction corresponds to the length of the casing along the axis direction, so that the two ends of the exhaust pipe along the axis direction are flush with the two end faces of the casing along the axis direction respectively; the casing and the exhaust pipe are flush with each other. A first chamber is formed therebetween, and there are several air circulation holes on the side wall of the exhaust pipe, and the exhaust pipe is communicated with the first chamber through the air circulation holes; One end of the gas end is the exhaust end; a conical baffle is arranged in the exhaust pipe at a position relatively close to the intake end, and the conical tip of the conical baffle faces the intake end. The exhaust muffler in this embodiment can divert the exhaust air flow of the engine, and can improve the noise reduction effect of the exhaust muffler and the power performance of the engine.

Description

an exhaust muffler

technical field

The utility model relates to the technical field of exhaust mufflers, in particular to an exhaust muffler.

Background technique

In order to reduce the exhaust sound from the engine, automobile companies install exhaust mufflers in the exhaust passage of the engine. The exhaust muffler forms a volume chamber on the outer peripheral side of the exhaust pipe of the exhaust passage, and the volume chamber is filled with a sound-absorbing material formed of glass fiber or foamed resin. sound produced by the air.

For example, Chinese Patent Publication No. CN102383899A discloses an exhaust muffler, which includes an exhaust pipe for exhausting the engine, the end of the exhaust pipe is provided with a sealing plate, and the tail of the exhaust pipe is wrapped in a sealed container , the container is fixedly connected to the exhaust pipe, the tail of the container is provided with an air outlet pipe, the exhaust pipe located in the container is provided with a number of air flow holes, and the container is also provided with a discharge pipe connected to the tail of the exhaust pipe and the inner wall of the container. sound film. In this solution, the muffler sheet can reduce the flow rate of the gas discharged from the muffler, and can reduce the deposition of solid particles on the muffler material.

The exhaust muffler in the above scheme includes an exhaust pipe with an exhaust hole and a casing (container) sleeved on the exhaust pipe. During operation, the exhaust air (gas flow) of the engine flows into the exhaust through the exhaust pipe. The muffler performs noise reduction, but in the actual use process, the existing muffler still has the following problems: the airflow discharged from the engine is turbulent and unstable, so that when the airflow just enters the exhaust muffler, it will hit the exhaust pipe, and in the Resonance occurs in the exhaust duct to produce noise, resulting in poor exhaust muffling effect; in addition, due to the disturbance and instability of the airflow, resonance occurs in the exhaust duct, making the airflow from the engine unsmooth, that is, generating a large amount of noise. Exhaust back pressure, resulting in large engine power loss and poor power performance.

Utility model content

In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is: how to provide an exhaust muffler capable of dredging the exhaust air flow of the engine, so as to improve the muffler effect of the exhaust muffler and the power of the engine.

In order to solve the above-mentioned technical problems, the utility model adopts the following technical solutions:

An exhaust muffler comprises an exhaust pipe and a casing sleeved on the outside of the exhaust pipe; the exhaust pipe and the casing are arranged coaxially, and the length of the exhaust pipe along the axis direction is the same as that of the casing The lengths along the axis direction are corresponding, so that the two ends of the exhaust pipe along the axis direction are flush with the two end faces of the casing along the axis direction respectively; a first cavity is formed between the casing and the exhaust pipe There are several air flow holes on the side wall of the exhaust pipe, and the exhaust pipe communicates with the first chamber through the air flow holes; one end of the exhaust pipe is the intake end, and The end away from the intake end is the exhaust end; the exhaust duct is provided with a conical baffle at a position relatively close to the intake end, and the conical tip of the conical baffle faces the intake end.

In this scheme, the airflow (gas flow) discharged from the engine enters the exhaust muffler through the intake end of the exhaust duct; when the airflow enters the exhaust duct, the conical baffle in the exhaust duct can divert the airflow and The flow is divided so that the air flow can enter the first chamber through the air flow hole and finally be discharged through the exhaust end. In this solution, the conical outer surface of the conical baffle can guide the airflow smoothly, so that the originally turbulent airflow and the generated airflow become smooth and smooth. On the other hand, compared with the turbulent airflow, the smooth and smooth airflow can be discharged out of the exhaust muffler faster and more smoothly, which can reduce the exhaust back pressure and improve the power performance of the engine.

Therefore, the exhaust muffler in this solution can divert the exhaust air flow of the engine, and can improve the noise reduction effect of the exhaust muffler and the power performance of the engine.

Preferably, at least a section of the exhaust duct where the conical baffle is installed is in the shape of a circular tube; The shaped baffle forms a partition for the inner space of the exhaust duct.

In this way, after the conical baffle blocks the inner space of the exhaust duct, the gas entering the intake end of the exhaust duct is smoothly blocked by the conical baffle and then completely diverted and shunted into the first chamber, and then passes through the subsequent gas After the flow hole enters the inner space of the exhaust pipe from the first chamber, it is discharged from the exhaust end, which better realizes the airflow dredging, and improves the noise reduction effect of the exhaust muffler and the power performance of the engine.

Preferably, the first cavity is provided with a perforated baffle perpendicular to the axis of the exhaust pipe; the inner side of the perforated baffle is sleeved on the outer side wall of the exhaust pipe, and the outer side is connected to the casing The inner side wall of the perforated baffle plate is provided with a plurality of air passage holes parallel to the axis of the casing.

In this way, after the airflow is channeled into the first chamber through the conical baffle, most of the airflow will re-enter the exhaust duct through the airflow hole, while another part of the airflow will still flow in the first chamber; enter the exhaust duct The air flow inside will become smooth after being "filtered" by the air flow holes, while the flowing air flow in the first chamber will become chaotic during the flow and hit the inner wall of the casing, causing noise. In this solution, a perforated baffle is arranged in the first chamber, so that the airflow flowing in the first chamber can be smoothed by the "filtering" of the perforated baffle through the air through holes, so as to eliminate the generated noise and further improve the engine power.

Preferably, the perforated baffle divides the first chamber into two chambers, and the chamber relatively close to the intake end is the second chamber, and the chamber relatively close to the exhaust end is the third chamber; the The second chamber and the third chamber are respectively filled with different sound-absorbing fillers.

In this way, the noise generated in the exhaust muffler is eliminated by the different sound-absorbing fillers filled in the second chamber and the third chamber, and the two different fillers can eliminate the noise twice, which is beneficial to improve the noise reduction. Eliminates the effect and also increases the durability of the exhaust muffler.

Preferably, the sound-absorbing filler filled in the second chamber is a steel ball.

In this way, the low-frequency noise and resonance noise generated by the airflow in the exhaust muffler can be eliminated by the steel ball, and the noise reduction effect of the exhaust muffler can be improved.

Preferably, the sound-absorbing filler filled in the third chamber is centrifugal glass wool.

In this way, the high-frequency noise generated by the airflow in the exhaust muffler can be eliminated by the steel ball, and in cooperation with the steel ball filled in the second chamber, the noise can be eliminated twice, and the high-frequency noise and low-frequency noise in the noise can be eliminated at the same time. and resonance noise, which can improve the muffler effect of the exhaust muffler.

Preferably, the intake end of the exhaust duct is provided with an intake extension duct coaxial with the exhaust duct and extending in a direction away from the housing.

In this way, the air intake extension pipe can be better connected to the engine end, so that the air can be better supplied, which is beneficial to improve the power performance of the engine.

Preferably, the exhaust end of the exhaust pipe has an exhaust extension pipe coaxial with the exhaust pipe and extending in a direction away from the casing.

In this way, the exhaust extension pipe can be better connected to the external exhaust equipment, so that the airflow can be better supplied and discharged, which is also conducive to improving the power performance of the engine.

Preferably, the distance between the conical baffle and the intake end is 1/4 of the total length of the exhaust duct along the axis.

Preferably, the distance between the perforated baffle and the exhaust end is 2/5 of the total length of the exhaust pipe along the axis.

Description of drawings

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be described in further detail below in conjunction with the accompanying drawings, wherein:

1 is a front cross-sectional view of an exhaust muffler in an embodiment;

Fig. 2 is the structural representation of the exhaust muffler in the embodiment;

3 is a schematic structural diagram of a conical baffle in an embodiment;

FIG. 4 is a schematic structural diagram of a perforated baffle in an embodiment.

Reference numerals in the accompanying drawings include: shell 1, exhaust duct 2, air flow hole 21, conical baffle 3, conical outer surface 31, perforated baffle 4, air through hole 41, air intake extension Pipe 5, exhaust extension pipe 6.

Detailed ways

The following is a further detailed description through specific embodiments:

Example:

This embodiment discloses an exhaust muffler.

As shown in Figure 1 and Figure 2: an exhaust muffler, comprising an exhaust pipe 2, and a casing 1 sleeved on the outside of the exhaust pipe 2; the exhaust pipe 2 is arranged coaxially with the casing 1, and the exhaust pipe The length of the pipe 2 along the axis direction corresponds to the length of the casing 1 along the axis direction, so that the two ends of the exhaust pipe 2 along the axis direction are flush with the two end faces of the casing 1 along the axis direction respectively; A first chamber is formed between 1 and the exhaust duct 2, and there are several airflow holes 21 on the side wall of the exhaust duct 2, and the exhaust duct 2 communicates with the first chamber through the airflow holes 21; One end of 2 is the intake end, and the end far away from the intake end is the exhaust end; the exhaust pipe 2 is provided with a conical baffle 3 at a position relatively close to the intake end, and the conical tip of the conical baffle 3 is positive. towards the intake end. In this embodiment, the distance between the conical baffle 3 and the intake end is 1/4 of the total length of the exhaust duct 2 along the axis, which is about 120 mm.

In this embodiment, the airflow discharged from the engine enters the exhaust muffler through the intake end of the exhaust duct 2; and when the airflow enters the exhaust duct 2, the conical baffle 3 in the exhaust duct 2 can guide the airflow And the flow is divided, so that the air flow can enter the first chamber through the air flow hole 21 and finally be discharged through the exhaust end. In this embodiment, the conical tip of the conical baffle 3 faces the intake end, so that the airflow entering the intake end can smoothly guide the airflow through the conical outer surface 31 of the conical baffle 3, so that the originally turbulent airflow is and the generated air flow becomes smooth and smooth. On the one hand, it can prevent the turbulent air flow from hitting the exhaust duct 2, so that the noise reduction effect is improved; on the other hand, the smooth and smooth air flow can be faster than the turbulent air flow. , Out of the exhaust muffler more smoothly, it can reduce the exhaust back pressure and improve the power performance of the engine.

In the specific implementation process, as shown in FIG. 3 : at least a section of the exhaust duct 2 where the conical baffle is installed is designed as a circular tube. Of course, the exhaust duct 2 can be designed as a circular tube as a whole; the bottom of the conical baffle 3 The edge of the round end is in abutment with the inner side wall of the exhaust duct 2 , so that the conical baffle 3 forms a partition for the inner space of the exhaust duct 2 .

In this way, after the inner space of the exhaust duct 2 is blocked by the conical baffle 3, the gas entering the intake end of the exhaust duct 2 is smoothly blocked by the conical baffle 3 and then completely diverted and shunted into the first chamber, and then After entering the inner space of the exhaust pipe 2 from the first chamber through the subsequent air flow holes, it is discharged from the exhaust end, which better realizes air flow dredging, and improves the noise reduction effect of the exhaust muffler and the power performance of the engine.

In the specific implementation process, as shown in FIG. 4 : the first cavity is provided with a perforated baffle 4 arranged perpendicular to the axis of the exhaust pipe 2; the inner side of the perforated baffle 4 is sleeved on the outer side wall of the exhaust pipe 2, and The outer side is fitted with the inner side wall of the casing 1 ; the perforated baffle plate 4 has a plurality of air passage holes 41 parallel to the axis of the casing 1 . In this embodiment, the distance between the perforated baffle 4 and the exhaust end is 2/5 of the total length of the exhaust pipe 2 along the axis, which is about 200 mm.

In this way, after the air flow passes through the conical baffle 3 and is dredged into the first chamber, most of the air flow will re-enter the exhaust duct 2 through the air flow hole 21, while another part of the air flow is still flowing in the first chamber; The airflow in the exhaust duct 2 will become smooth after being "filtered" by the airflow holes 21, while the flowing airflow in the first chamber will become chaotic during the flow and hit the inner wall of the housing 1, resulting in noise. In this embodiment, a perforated baffle 4 is arranged in the first chamber, so that the airflow in the first chamber can be smoothed by the “filtering” of the perforated baffle 4 through the air through holes 41, so that the generated noise can be eliminated. And further improve the power of the engine.

In the specific implementation process, the perforated baffle 4 divides the first chamber into two chambers, and the chamber relatively close to the intake end is the second chamber, and the chamber relatively close to the exhaust end is the third chamber; The second chamber and the third chamber are respectively filled with different sound-absorbing fillers.

In this way, the noise generated in the exhaust muffler is eliminated by the different sound-absorbing fillers filled in the second chamber and the third chamber, and the two different fillers can eliminate the noise twice, which is beneficial to improve the noise reduction. Eliminates the effect and also increases the durability of the exhaust muffler.

In a specific implementation process, the sound-absorbing filler filled in the second chamber is steel balls.

In this way, the low-frequency noise and resonance noise generated by the airflow in the exhaust muffler can be eliminated by the steel ball, and the noise reduction effect of the exhaust muffler can be improved.

In the specific implementation process, the noise-absorbing filler filled in the third chamber is centrifugal glass wool.

In this way, the high-frequency noise generated by the airflow in the exhaust muffler can be eliminated by the steel ball, and in cooperation with the steel ball filled in the second chamber, the noise can be eliminated twice, and the high-frequency noise and low-frequency noise in the noise can be eliminated at the same time. and resonance noise, which can improve the muffler effect of the exhaust muffler.

In a specific implementation process, the intake end of the exhaust duct 2 has an intake extension duct 5 that is coaxial with the exhaust duct 2 and extends in a direction away from the housing 1 . In this embodiment, the length of the air intake extension duct 5 is 51 mm, and the air intake extension duct 5 is connected to the exhaust duct 2 by welding.

In this way, the air intake extension duct 5 can be better connected to the engine end, so that the airflow can be better supplied, which is beneficial to improve the power performance of the engine.

In a specific implementation process, the exhaust end of the exhaust pipe 2 has an exhaust extension pipe 6 which is coaxial with the exhaust pipe 2 and extends in a direction away from the casing 1 . In this embodiment, the length of the exhaust extension pipe 6 is 51 mm, and the exhaust extension pipe 6 is connected to the exhaust pipe 2 by welding.

In this way, the exhaust extension pipe 6 can be better connected to the external exhaust equipment, so that the air can be supplied and discharged better, which is also beneficial to improve the power performance of the engine.

The above are only examples of the present utility model, and common knowledge such as the well-known specific structures and characteristics in the scheme have not been described too much here. Those of ordinary skill in the art know that the utility model belongs to the technical field before the filing date or the priority date. General technical knowledge, can know all the prior art in this field, and have the ability to apply conventional experimental means before the date, those of ordinary skill in the art can, under the inspiration given in this application, combine their own ability to perfect and implement this solutions, some typical well-known structures or well-known methods should not be obstacles to those skilled in the art from practicing the present application. It should be pointed out that for those skilled in the art, under the premise of not departing from the structure of the present utility model, several deformations and improvements can also be made, which should also be regarded as the protection scope of the present utility model, and these will not affect the present utility model. The effect of the implementation of the new model and the practicability of the patent. The scope of protection claimed in this application shall be based on the content of the claims, and the descriptions of the specific implementation manners in the description can be used to interpret the content of the claims.

Claims (10)

1. An exhaust muffler, characterized in that: it comprises an exhaust pipe, and a casing sleeved on the outside of the exhaust pipe; the exhaust pipe and the casing are arranged coaxially, and the exhaust pipe is along the axis direction The length of the upper part corresponds to the length of the housing along the axial direction, so that the two ends of the exhaust pipe along the axial direction are flush with the two end faces of the housing along the axial direction respectively; A first chamber is formed between the housing and the exhaust duct, and the side wall of the exhaust duct is provided with several air circulation holes, and the exhaust duct communicates with the first chamber through the air circulation holes ; One end of the exhaust duct is the intake end, and the end away from the intake end is the exhaust end; the exhaust duct is provided with a conical baffle at a position relatively close to the intake end, and the conical baffle is The tapered tip of the plate is facing towards the intake end. 2. The exhaust muffler according to claim 1, characterized in that: at least a section of the exhaust duct where the conical baffle is installed is in the shape of a circular tube; The inner sidewall of the exhaust duct is abutted and matched, so that the conical baffle blocks the inner space of the exhaust duct. 3 . The exhaust muffler according to claim 1 , wherein: the first chamber is provided with a perforated baffle perpendicular to the axis of the exhaust pipe; the inner side of the perforated baffle is sleeved with the The outer side wall of the exhaust duct is fitted with the inner side wall of the casing; the perforated baffle plate is provided with a plurality of air passage holes parallel to the axis of the casing. 4 . The exhaust muffler according to claim 3 , wherein the perforated baffle divides the first chamber into two chambers, and the chamber relatively close to the intake end is the second chamber, which is opposite to the second chamber. 5 . The chamber close to the exhaust end is the third chamber; the second chamber and the third chamber are respectively filled with different sound-absorbing fillers. 5 . The exhaust muffler according to claim 4 , wherein the sound-absorbing filler filled in the second chamber is steel balls. 6 . 6 . The exhaust muffler according to claim 5 , wherein the noise-absorbing filler filled in the third chamber is centrifugal glass wool. 7 . 7 . The exhaust muffler according to claim 1 , wherein the intake end of the exhaust duct has an intake extension duct coaxial with the exhaust duct and extending away from the housing. 8 . 8 . The exhaust muffler of claim 3 , wherein the exhaust end of the exhaust pipe has an exhaust extension pipe coaxial with the exhaust pipe and extending away from the casing. 9 . 9 . The exhaust muffler according to claim 1 , wherein the distance between the conical baffle plate and the intake end is 1/4 of the total length of the exhaust pipe along the axis. 10 . 10. The exhaust muffler according to claim 3, wherein the distance between the perforated baffle and the exhaust end is 2/5 of the total length of the exhaust pipe along the axis.

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