CN207526561U - Silencer - Google Patents

Abstract

The utility model discloses a muffler. The muffler comprises: a housing, an air inlet pipe, an exhaust pipe and a standing wave pipe. At least one of the air inlet pipe and the exhaust pipe is provided with at least one standing wave pipe. A wave tube, the standing wave tube is located outside the casing, and the inlet of the standing wave tube is spaced apart from the outlet of the standing wave tube along the axial direction of the tube where it is arranged. According to the muffler of the embodiment of the present invention, a standing wave tube is arranged on the intake pipe or the exhaust pipe, so that the airflow and noise are diverted when flowing through the intake pipe or the exhaust pipe, and a part of the airflow and noise pass through the inlet of the standing wave pipe. Flowing into the standing wave tube, another part of the airflow and noise flows directly in the intake pipe or exhaust pipe and merges with the airflow and noise flowing out of the standing wave tube through the outlet of the standing wave tube, and finally flows out of the intake pipe or exhaust pipe together. Therefore, through the setting of the standing wave tube, the muffler can eliminate the noise of a specific frequency in a targeted manner, and the noise reduction effect is good.

Description

silencer

technical field

The utility model relates to the technical field of muffler, in particular to a muffler.

Background technique

In the related art, the muffler is composed of a housing, an intake pipe, and an exhaust pipe. The airflow and noise flow into the muffler through the intake pipe and are discharged through the exhaust pipe. During the whole process, the muffler can only eliminate some Noise, the overall noise reduction effect is poor, and affected by the space layout of the chassis, the length of the exhaust pipe is difficult to change, resulting in a single muffler frequency and poor muffler effect.

Utility model content

The utility model aims at at least solving one of the technical problems existing in the prior art. For this reason, the utility model proposes a muffler capable of eliminating specific frequency noise in a targeted manner and having a good noise reduction effect.

The muffler according to the embodiment of the present invention includes: a housing, an air inlet pipe, an exhaust pipe and a standing wave pipe, at least one of the standing wave pipes is provided on at least one of the air inlet pipe and the exhaust pipe, so The standing wave tube is located outside the casing, and the inlet of the standing wave tube is spaced apart from the outlet of the standing wave tube along the axial direction of the tube where it is arranged.

According to the muffler of the embodiment of the present invention, a standing wave tube is arranged on the intake pipe or the exhaust pipe, so that the airflow and noise are diverted when flowing through the intake pipe or the exhaust pipe, and a part of the airflow and noise pass through the inlet of the standing wave pipe. Flowing into the standing wave tube, another part of the airflow and noise flows directly in the intake pipe or exhaust pipe, and flows out of the intake pipe or exhaust pipe together with the airflow and noise flowing out of the standing wave tube through the outlet of the standing wave tube. Therefore, through the setting of the standing wave tube, the muffler can eliminate the noise of a specific frequency in a targeted manner, and the noise reduction effect is better.

According to some embodiments of the present invention, the standing wave tube is a linear tube, and the inlet of the standing wave tube is axially opposite to or staggered from the outlet of the standing wave tube.

According to some embodiments of the present utility model, there are multiple standing wave tubes, the length of the standing wave tube is L1, and the inlet of the standing wave tube and the outlet of the standing wave tube are in the axial direction The spacing is L2, and the values of L1-L2 of the plurality of standing wave tubes are different.

According to some embodiments of the present invention, the plurality of standing wave tubes are connected to the intake pipe and uniformly distributed along the circumference of the intake pipe; and/or the plurality of standing wave tubes are connected to the exhaust pipe and uniformly distributed along the circumference of the exhaust pipe.

According to some embodiments of the present utility model, at least three chambers distributed sequentially along the axial direction are defined in the housing, adjacent chambers are communicated through a plurality of flow holes, and the two chambers at the outermost ends are respectively the first chambers. chamber and tail chamber, the chamber between the first chamber and the tail chamber is an intermediate chamber, the inlet pipe passes through the multiple chambers in sequence and the outlet of the inlet pipe is connected to the tail chamber The chambers are connected, and the number of the exhaust pipes is multiple, and the inlets of the multiple exhaust pipes are located in different chambers, and the inlet pipe has a first silencer connected to at least one of the intermediate chambers. The exhaust pipe has a second silencing hole, the second silencing hole communicates with the first silencing hole through the same intermediate chamber, the chamber where the inlets of the multiple exhaust pipes are located, the The tail chambers are respectively located on both sides of the middle chamber where the first sound-damping hole and the second sound-damping hole are located.

In some embodiments, the housing defines at least three chambers that are sequentially distributed in the axial direction, adjacent chambers communicate through a plurality of flow holes, and the two outermost chambers are the first chamber and the tail chamber respectively. chamber, the outlet of the air intake pipe communicates with the tail chamber, the inlet of the exhaust pipe communicates with the first chamber, and the side wall of the air intake pipe has a plurality of first silencer holes, so The plurality of first silencing holes communicate with at least one of the plurality of chambers except the tail chamber.

In some other embodiments, the casing defines a plurality of chambers distributed in sequence along the axial direction, and adjacent chambers are communicated through a plurality of flow holes, and the two outermost chambers are respectively the first chamber and the tail chamber. chamber, the inlet pipe passes through the plurality of chambers in sequence and communicates with the tail chamber, and the inlet pipe has a plurality of holes communicating with at least one of the other chambers except the tail chamber. There are a plurality of first silencing holes, and there are multiple exhaust pipes, each of which passes through the plurality of chambers in sequence and communicates with the first chamber.

In some specific embodiments, the muffler further includes a guide pipe and a valve located in the casing, the casing defines a plurality of chambers distributed in sequence along the axial direction, and the two chambers at the outermost end are respectively the first chamber and the tail chamber, the chamber between the first chamber and the tail chamber is an intermediate chamber, and the adjacent chambers in the multiple chambers except the tail chamber are communicated through flow holes, so The inlet pipe passes through the plurality of chambers in turn, the outlet of the inlet pipe is located in the tail chamber and is selectively communicated with the tail chamber through a valve covered thereon, and the inlet pipe has a plurality of first silencing holes communicated with the intermediate chamber, the exhaust pipe passes through the plurality of chambers and communicates with the first chamber, the guide pipe is located in the housing, One end of the guide tube communicates with the first chamber and the other end communicates with the tail chamber.

In some other specific embodiments, the housing defines a plurality of chambers distributed sequentially along the axial direction, and the plurality of chambers are connected through flow holes, and the two outermost chambers are the first chambers respectively. and the tail chamber, the chamber between the first chamber and the tail chamber is an intermediate chamber, the number of the intermediate chamber is at least one and at least one of the intermediate chambers is provided with a sound-absorbing member, so The inlet pipe passes through the plurality of chambers in turn, the outlet of the inlet pipe is located in one of the intermediate chambers and is blocked, and the inlet pipe has a plurality of chambers connected to each other except the tail chamber. a first muffler hole, the exhaust pipe passes through the plurality of chambers and communicates with the tail chamber, the outlet of the exhaust pipe is located outside the housing, and the exhaust pipe passes through in turn The tail chamber, the middle chamber and the middle chamber detour to extend into the tail chamber.

In some embodiments, the casing defines a plurality of chambers that are sequentially distributed in the axial direction, and adjacent chambers are communicated through flow holes, and the two outermost chambers are respectively the head chamber and the tail chamber, The chamber located in the middle is the middle chamber, the first chamber and the tail chamber are respectively provided with a first air outlet and a second air outlet communicating with the outside world, and the air inlet pipe extends into the housing and is connected with the The middle chamber is connected, the number of the exhaust pipe is two, and the inlet of one exhaust pipe is connected with a chamber located on one side of the middle chamber, and the outlet is formed as the The first air outlet, the inlet of the other exhaust pipe communicates with a chamber located on the other side of the middle chamber, and the outlet is formed as the second air outlet.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present utility model will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is the schematic diagram of the muffler according to the utility model embodiment;

Fig. 2 is a partial schematic view of the muffler according to the first embodiment of the utility model;

3 is a partial schematic diagram of a muffler according to a second embodiment of the present invention;

Fig. 4 is a partial schematic diagram of a muffler according to a third embodiment of the present invention;

Fig. 5 is a partial schematic view of a muffler according to a fourth embodiment of the present invention;

Fig. 6 is a partial schematic diagram of a muffler according to a fifth embodiment of the present invention;

Fig. 7 is a partial schematic diagram of a muffler according to a sixth embodiment of the present invention.

Reference signs:

muffler 100,

Shell 10, outer shell 11, partition 12, intake pipe 20, first muffler hole 21, exhaust pipe 30, second muffler hole 31, standing wave tube 40, guide tube 50, valve 60, sound-absorbing parts 70, the first air outlet 80, the second air outlet 90,

The first chamber a, the middle chamber b, and the tail chamber c.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, but should not be construed as limiting the present utility model.

A muffler 100 according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 7 .

The muffler 100 according to the embodiment of the present utility model includes: a housing 10, an air inlet pipe 20, an exhaust pipe 30 and a standing wave pipe 40, at least one of the air inlet pipe 20 and the exhaust pipe 30 is provided with at least one standing wave pipe 40 , the standing wave tube 40 is located outside the casing 10, and the inlet of the standing wave tube 40 is spaced apart from the outlet of the standing wave tube 40 along the axial direction of the tube where it is arranged.

According to the muffler 100 of the embodiment of the present utility model, by setting the standing wave tube 40 on the intake pipe 20 or the exhaust pipe 30, the airflow and noise are diverted when flowing through the intake pipe 20 or the exhaust pipe 30, and a part of the airflow and noise The inlet of the standing wave tube 40 flows into the standing wave tube 40, and another part of the airflow and noise directly flows in the intake pipe 20 or the exhaust pipe 30 and merges with the airflow and noise flowing out of the standing wave tube 40 through the outlet of the standing wave tube 40 After that, they flow out of the intake pipe 20 or the exhaust pipe 30 together, and make the gas and noise produce a canceling effect between the standing wave pipe 40 and the intake pipe 20 or between the standing wave pipe 40 and the exhaust pipe 30 . Therefore, through the arrangement of the standing wave tube 40, the muffler 100 can eliminate the noise of a specific frequency in a targeted manner, and the noise reduction effect is good.

That is to say, at least one standing wave tube 40 can be set on the intake pipe 20, at least one standing wave tube 40 can also be set on the exhaust pipe 30, or at least one standing wave tube 40 can be set on the intake pipe 20 and the exhaust pipe 30 respectively. The standing wave tube 40 , and furthermore, the muffler 100 can specifically eliminate the noise of a specific frequency through the setting of the standing wave tube 40 .

According to some embodiments of the present invention, the standing wave tube 40 is a linear tube, and the inlet of the standing wave tube 40 is opposite to or staggered from the outlet of the standing wave tube 40 in the axial direction.

Specifically, the standing wave tube 40 is installed on the intake pipe 20 or the exhaust pipe 30 , and the inlet and outlet of the standing wave tube 40 may be axially aligned or circumferentially staggered. Thus, when the inlet and outlet of the standing wave tube 40 are axially facing each other, not only can the installation of the standing wave tube 40 be facilitated, but also make the processing of the standing wave tube 40 simpler; When they are staggered in the circumferential direction, the staggered openings and inlets can make the airflow and noise enter the standing wave tube 40 from one angle, and flow out of the standing wave tube 40 from another angle, so that the standing wave tube 40 and the intake pipe 20 or the standing wave tube 40 The effect of counteracting the effect produced between the exhaust pipe 30 is better.

Of course, the present invention may not be limited thereto, and the standing wave tube 40 may be a linear tube extending along a single pipeline track, or a non-linear tube extending in multiple directions without a fixed track.

As shown in Figure 1, the number of standing wave tubes 40 is multiple, the length of standing wave tubes 40 is L1, the distance between the inlet of standing wave tubes 40 and the outlet of standing wave tubes 40 in the axial direction is L2, a plurality of The values of L1-L2 of the standing wave tube 40 are different.

Specifically, the flow length of the air flow and noise transmitted to the exhaust pipe 30 through the standing wave pipe 40 is D1, the flow length of the air flow and noise directly removed along the exhaust pipe 30 is D2, and the standing wave The airflow and noise in the pipe 40 and the airflow and noise in the exhaust pipe 30 merge at the outlet of the standing wave pipe 40 to produce a canceling effect to reduce noise and eliminate noise.

Wherein, the noise reduction frequency range in which the standing wave tube 40 and the exhaust pipe 30 produce a canceling effect can be changed by changing the ratio of D1 to D2, and the calculation formula of the noise reduction frequency is: Thus, standing wave tubes 40 of different lengths can be installed on the intake pipe 20 or exhaust pipe 30, so that the specific frequency range of the noise that can be eliminated by the muffler 100 is different, and the multiple standing wave tubes 40 The setting increases the muffler frequency range of the muffler 100 .

In addition, when the inlet of the standing wave tube 40 is opposite to the outlet, the axial distance between the inlet of the standing wave tube 40 and the outlet of the standing wave tube 40 is L2; when the inlet of the standing wave tube 40 is staggered from the outlet of the standing wave tube 40, The linear distance between the inlet and the outlet of the standing wave tube 40 is L2.

It should be noted that, in some embodiments, the shape of the standing wave tube 40 is generally "U", in other embodiments, the shape of the standing wave tube 40 is "W", in some other embodiments , the shape of the standing wave tube 40 is "V" shape. It can be understood that the shape of the standing wave tube 40 is not specifically limited, as long as the shape of the standing wave tube 40 that can achieve the effect of eliminating noise at a specific frequency is an optional embodiment of the present invention.

In some specific embodiments, a plurality of standing wave tubes 40 are connected to the intake pipe 20 and distributed uniformly along the circumference of the intake pipe 20; and/or a plurality of standing wave tubes 40 are connected to the exhaust pipe 30 and distributed along the exhaust pipe 30 evenly distributed circumferentially.

Specifically, a plurality of standing wave tubes 40 may be arranged only in the circumferential direction of the intake pipe 20, or a plurality of standing wave tubes 40 may be arranged only in the circumferential direction of the exhaust pipe 30; A plurality of standing wave tubes 40 are arranged in the circumferential direction of the air tube 30 . Thus, the muffler 100 can eliminate noises in a variety of specific frequency ranges through the multiple standing wave tubes 40 on the intake pipe 20, on the exhaust pipe 30, or on the intake pipe 20 and the exhaust pipe 30, and then The noise reduction range of the muffler 100 is larger.

It should be noted that the outer shell 11 is composed of a casing, a head end cap and a tail end cap, and only the head end cap and the tail end cap of the outer casing are shown in the accompanying drawings 2-7, and the casing is not shown.

The muffler 100 according to six specific embodiments of the present utility model will be described below with reference to FIGS. 2-7 .

Embodiment one

As shown in FIG. 2 , the muffler 100 includes: a housing 10 , an intake pipe 20 , an exhaust pipe 30 and a standing wave pipe 40 .

Wherein, the casing 10 defines at least three chambers that are distributed sequentially along the axial direction, and adjacent chambers communicate through a plurality of flow holes (not shown in the figure), and the two chambers located at the outermost ends are respectively the first chambers. chamber a and the tail chamber c, the outlet of the intake pipe 20 communicates with the tail chamber c, the inlet of the exhaust pipe 30 communicates with the first chamber a, the side wall of the intake pipe 20 has a plurality of first silencing holes 21, The plurality of first sound-absorbing holes 21 communicate with at least one of the plurality of chambers except the tail chamber c, and the standing wave pipe 40 is installed on the exhaust pipe 30 .

Therefore, by setting the standing wave pipe 40 on the exhaust pipe 30 , the muffler 100 can eliminate noise in some specific frequency ranges, thereby making the muffler 100 have a better noise reduction effect.

Embodiment two

As shown in FIG. 3 , the muffler 100 includes: a casing 10 , an intake pipe 20 , two exhaust pipes 30 and a standing wave pipe 40 , and the casing 10 is composed of an outer casing 11 and a partition 12 .

Wherein, the housing 10 defines at least three chambers that are distributed sequentially along the axial direction, and adjacent chambers communicate through a plurality of flow holes, and the two chambers at the outermost end are respectively the first chamber a and the tail chamber c , the chamber between the first chamber a and the tail chamber c is the middle chamber b, the inlet pipe 20 passes through multiple chambers in turn and the outlet of the inlet pipe 20 communicates with the tail chamber c, and the exhaust pipe 30 The number is multiple, the inlets of multiple exhaust pipes 30 are located in different chambers, the intake pipe 20 has a first silencing hole 21 communicating with at least one of the intermediate chambers b, and the exhaust pipe 30 has a second silencing hole hole 31, the second silencing hole 31 communicates with the first silencing hole 21 through the same intermediate chamber b, and the chamber where the inlets of the multiple exhaust pipes 30 are located and the tail chamber c are respectively located in the first silencing hole 21 and the second silencing hole. The two sides of the middle chamber b where the muffler hole 31 is located, and the standing wave tube 40 is installed on the intake pipe 20 .

In other words, the muffler 100 is divided by the outer casing 11 and a plurality of partitions 12 into a first chamber a, two middle chambers b, and a tail chamber c distributed sequentially in the axial direction, and the intake pipe 20 passes through the first chamber a and the middle chamber Chamber b extends into the tail chamber c, an exhaust pipe 30 passes through the tail chamber c and an intermediate chamber b adjacent to the tail chamber c and extends into another intermediate chamber b, and the other An exhaust pipe 30 passes through the tail chamber c and the middle chamber b to extend into the first chamber a, and a plurality of dividing plates 12 are provided with flow holes, and the first muffler hole 21 on the intake pipe 20 is connected with the exhaust pipe. The second sound-absorbing holes 31 on the air pipe 30 are all in the middle chamber b adjacent to the tail chamber c.

Thus, the intake pipe 20 and the tail chamber c, one exhaust pipe 30 and the first chamber a, and the other exhaust pipe 30 and the intermediate chamber b near the first chamber a side form three resonant cavities. The arrangement of the two resonant chambers makes the muffler 100 have higher noise reduction and noise reduction capabilities for low-frequency noise, and the noise reduction for low-frequency noise is complete and sufficient. The standing wave tube 40 installed on the intake pipe 20 enables the muffler 100 to eliminate some specific The noise in the frequency range, and then the setting of multiple chambers and standing wave tubes 40 makes the muffler 100 have a high low-frequency noise noise reduction ability, and can reduce the noise of some specific frequencies to improve the noise of the muffler 100. Noise reduction and noise reduction capabilities.

The difference between the muffler 100 in the specific embodiment shown in FIG. 3 and the muffler 100 in Embodiment 1 is that the muffler 100 shown in FIG. 2 realizes muffler for low-frequency noise through multiple resonant cavities.

Embodiment three

As shown in FIG. 4 , the muffler 100 includes: a casing 10 , an intake pipe 20 , two exhaust pipes 30 and three standing wave pipes 40 , and the casing 10 is composed of an outer casing 11 and a partition 12 .

Wherein, the casing 10 defines a plurality of chambers distributed in sequence along the axial direction, and adjacent chambers are communicated through a plurality of flow holes, and the two chambers located at the outermost end are respectively the first chamber a and the tail chamber c, The air intake pipe 20 passes through a plurality of chambers in turn and communicates with the tail chamber c, and the air inlet pipe 20 has a plurality of first silencing holes 21 communicated with at least one of the other chambers except the tail chamber c. The number of air pipes 30 is two, and each exhaust pipe 30 passes through a plurality of chambers in turn and communicates with the first chamber a, and a standing wave pipe 40 and an air intake pipe are respectively installed on the plurality of exhaust pipes 30. Standing wave tube 40 is also installed on 20.

As a result, the airflow in the intake pipe 20 flows into the first chamber a, the middle chamber b, and the tail chamber c sequentially through the first muffler hole 21, which strengthens the reflection and cancellation effect of the muffler 100 on noise, and finally the first chamber a The airflow and noise of the exhaust pipe 30 respectively enter the exhaust pipe 30 through the inlets of the multiple exhaust pipes 30, and are finally discharged out of the muffler 100, so that the noise flowing out through the single exhaust pipe 30 is reduced more, and at the same time, it passes through the longer exhaust pipe 30. The exhaust pipe 30 makes the pipe for noise to flow into the outside longer, and the longer the pipe from which the noise is derived, the lower the frequency corresponding to the standing wave cancellation effect of the sound, so that the muffler 100 can eliminate the noise of lower frequencies, and it is installed on the intake pipe 20 The standing wave tube 40 of the standing wave tube 40 and the standing wave tube 40 of different length L1 respectively arranged on the two exhaust pipes 30 enable the muffler 100 to eliminate the noise in at least three specific frequency ranges, and then the noise that the muffler 100 can eliminate The frequency range of the noise is wider and the sound attenuation effect is better.

The difference between the muffler 100 in the third embodiment and the muffler 100 in the first embodiment is that the muffler 100 makes the air flow and the noise flow through the first chamber a, the middle chamber b and the tail chamber c sequentially through the intake pipe 20, which strengthens the noise The reflection canceling effect, and through the arrangement of multiple exhaust pipes 30, the noise in a single exhaust pipe 30 is reduced more, and then the purpose of noise reduction and noise reduction is achieved.

Embodiment four

As shown in Figure 5, the muffler 100 includes: a housing 10, an intake pipe 20, an exhaust pipe 30, a guide pipe 50, a valve 60 and two standing wave pipes 40, and the housing 10 is composed of an outer shell 11 and a partition 12 .

In some specific embodiments, the muffler 100 also includes a guide pipe 50 and a valve 60 located in the housing 10, and the housing 10 defines a plurality of chambers distributed in sequence along the axial direction, and the two chambers located at the outermost end The chambers are the first chamber a and the tail chamber c respectively, the chamber located between the first chamber a and the tail chamber c is the middle chamber b, and the adjacent chambers in the multiple chambers except the tail chamber c The chambers are communicated through flow holes, and the air intake pipe 20 passes through a plurality of chambers in sequence, and the outlet of the air intake pipe 20 is located in the tail chamber c and is selectively communicated with the tail chamber c through a valve 60 covered thereon to further The air pipe 20 has a plurality of first silencing holes 21 communicating with the middle chamber b, the exhaust pipe 30 passes through the plurality of chambers and communicates with the first chamber a, the guide pipe 50 is located in the casing 10, and guides One end of the pipe 50 communicates with the first chamber a and the other end communicates with the tail chamber c, a shorter standing wave pipe 40 is installed on the intake pipe 20, and a longer standing wave pipe 40 is installed on the exhaust pipe 30 The pipe 40, and the valve 60 is configured to switch to an open state when the elastic resistance force of the valve 60 is overcome by the pressure difference force in the intake pipe 20.

In other words, the muffler 100 is divided by the outer casing 11 and a plurality of partitions 12 into a first chamber a, a tail chamber c, and an intermediate chamber b distributed sequentially in the axial direction, wherein the intake pipe 20 passes through the area of the intermediate chamber b The first sound-absorbing hole 21 is arranged on the top, and the adjacent partitions 12 between the multiple intermediate chambers b and the partitions 12 connected to the first chamber a are provided with flow holes, so that the airflow and noise can circulate, and the air intake pipe 20 is in the One end in the tail chamber c is connected to the valve 60 .

Thus, the opening and closing state of the valve 60 can be changed by the pressure difference force in the intake pipe 20 , thereby changing the working condition of the muffler 100 , and the muffler 100 has two working conditions.

The first working condition: when the valve 60 is closed, the air flow and noise enter the intake pipe 20 from the outside, enter the middle chamber b through the first silencer hole 21 on the intake pipe 20, and then pass through the The flow hole on the partition 12 enters the first chamber a, and in the first chamber a, the noise can enter the tail chamber c through the guide pipe 50 (at this time, the airflow flowing into the first chamber a directly flows into the first chamber a through the exhaust pipe 30 The outside world will not enter the tail chamber c through the guide pipe 50; at this time, part of the noise flowing into the first chamber a flows into the outside world through the exhaust pipe 30, and the other part enters the tail chamber c through the guide pipe 50, and then passes through the tail chamber c. Eliminate by resonance in the chamber c.), finally all the noise and airflow flow from the first chamber a to the outside through the exhaust pipe 30, in this working condition, the draft pipe 50 and the tail chamber c form a resonance Cavity structure, so that the muffler 100 can eliminate low-frequency noise, and the noise reduction effect on low-frequency noise is better, and at the same time reduce the noise at some specific frequencies through the standing wave tube 40 installed on the inlet pipe 20 and the outlet pipe;

The second operating condition: when the valve 60 is opened, the airflow and noise enter the intake pipe 20 from the outside, part of it enters the tail chamber through the valve 60, and then enters the first chamber a through the guide pipe 50, and the other part passes through the intake pipe 20 The first sound-absorbing hole 21 on the top enters the middle chamber b, and then enters the first chamber a through the flow hole on the partition plate 12 before the first chamber a and the middle chamber b, and finally all the noise and air flow are discharged from the first chamber Room a is discharged to the outside through the exhaust pipe 30. Under this working condition, it has a good noise reduction effect on medium and high frequency noise, and at the same time, the standing wave tube 40 installed on the inlet pipe 20 and the outlet pipe reduces the noise at some specific frequencies. .

In this way, the muffler 100 of the embodiment of the utility model can adjust the opening and closing state of the valve 60 according to the pressure of the airflow entering the intake pipe 20, so that the muffler 100 can eliminate noise in a targeted manner and automatically follow the work of the muffled parts. The state changes to change the working conditions, and cooperate with the standing wave tube 40 to reduce noise and eliminate noise, so that the noise reduction range of the muffler 100 is larger, the matching is stronger, and the noise reduction effect is better.

The difference between the specific embodiment shown in FIG. 5 and Embodiment 1 is that the muffler 100 can adjust the working condition of the muffler 100 by adjusting the opening and closing state of the valve 60, and cooperate with the standing wave tube 40 to achieve The purpose of targeted noise reduction.

Embodiment five

As shown in FIG. 6 , the muffler 100 includes: a casing 10 , an intake pipe 20 , an exhaust pipe 30 , a sound-absorbing component 70 and a standing wave pipe 40 , and the casing 10 is composed of an outer casing 11 and a partition 12 .

Among them, the casing 10 defines a plurality of chambers distributed in sequence along the axial direction, and the plurality of chambers are connected through flow holes, and the two chambers at the outermost end are respectively the first chamber a and the tail chamber c, located The chamber between the chamber a and the tail chamber c is an intermediate chamber b, the number of the intermediate chamber b is at least one and at least one intermediate chamber b is provided with a sound-absorbing member 70, and the air intake pipe 20 passes through multiple chambers in sequence. The outlet of the air intake pipe 20 is located in one of the intermediate chambers b and is blocked, the air intake pipe 20 has a plurality of first muffler holes 21 connected to each chamber except the tail chamber c, and the exhaust air The pipe 30 passes through a plurality of chambers and communicates with the tail chamber c, the outlet of the exhaust pipe 30 is located outside the housing 10, and the exhaust pipe 30 passes through the tail chamber c, the middle chamber b and in the middle chamber in turn. B is detoured to extend into the tail chamber c. The exhaust pipe 30 has a plurality of second silencing holes 31 communicating with the middle chamber b. The middle chamber b where the outlet of the intake pipe 20 is located is connected to the second silencing holes 31 The intermediate chamber b is the same, and the standing wave pipe 40 is installed on the intake pipe 20 .

In other words, the muffler 100 is divided by the outer casing 11 and a plurality of partitions 12 into a first chamber a, an intermediate chamber b, and a tail chamber c distributed sequentially in the axial direction, wherein the intake pipe 20 passes through the first chamber a and Extending into at least one intermediate chamber b, the air inlet pipe 20 communicates with the intermediate chamber b and the first chamber a through the first silencing hole 21, and a plurality of partitions 12 are provided with flow holes, the gas and noise can be Flow in the first chamber a and the middle chamber b.

Thus, the airflow and noise pass through the first chamber a, the middle chamber b and the tail chamber c sequentially, so that the noise reduction effect of the sound-absorbing member 70 is better, and the setting of the longer exhaust pipe 30 enables the muffler 100 to The frequency range of the reduced noise is wider, and the setting of the standing wave tube 40 enables the muffler 100 to reduce the noise at a specific frequency.

The difference between the specific embodiment shown in Figure 6 and the muffler 100 in Embodiment 1 is that the setting of the longer exhaust pipe 30 makes the noise reduction range of the muffler 100 larger, and in at least one middle chamber b The sound-absorbing member 70 is provided so that the muffler 100 can also reduce the noise of medium and high frequency noise, and the noise reduction effect is good.

Embodiment six

As shown in FIG. 7 , the muffler 100 includes: a casing 10 , an intake pipe 20 , two exhaust pipes 30 and a standing wave pipe 40 , and the casing 10 is composed of an outer casing 11 and a partition 12 .

Among them, the casing 10 defines a plurality of chambers distributed in sequence along the axial direction, and the adjacent chambers are communicated through the flow holes. The chamber is the middle chamber, the first chamber a and the tail chamber c are respectively provided with a first air outlet 80 and a second air outlet 90 communicating with the outside world, the air inlet pipe 20 extends into the housing 10 and connects with the middle chamber The intake pipe 20 has a plurality of first silencing holes 21, the number of the exhaust pipe 30 is two, and the exhaust pipe 30 has a second silencing hole 31, and the inlet of one of the exhaust pipes 30 is located in the middle. A chamber on one side of the chamber b is connected, and the outlet is formed as a first air outlet 80, and the inlet of the other exhaust pipe 30 is connected with a chamber on the other side of the middle chamber, and the outlet is formed as The second air outlet 90, and the two standing wave tubes 40 are respectively connected to the two exhaust pipes 30, the length of the standing wave tube 40 connected to the exhaust pipe 30 on the side near the tail chamber c is relatively long, and is connected to the The length of the standing wave pipe 40 of the exhaust pipe 30 near the first chamber a is relatively short.

Thus, from the intake pipe 20 to the middle chamber b, by virtue of the sudden expansion of the cross-section of the pipe, the noise of certain frequencies propagating in the housing 10 is reflected back toward the inlet direction of the air intake pipe 20 at the sudden change in the pipe, thereby Achieve the purpose of sound resistance and noise reduction, and effectively eliminate low and medium frequency noise; in addition, before the airflow and noise are discharged from the first air outlet 80 and the second air outlet 90, the impedance noise reduction can be carried out through the silencer 70 to further eliminate the middle and high frequency noise , and the arrangement of the two standing wave tubes 40 enables the muffler 100 to specifically reduce noise at specific frequencies.

In this way, by making the air flow and noise flow directly into the middle chamber b from the outside, and evenly divide them into the chambers on both sides of the middle chamber b, and finally pass through the first air outlet 80 in the first chamber a and the first air outlet 80 in the tail chamber respectively. The second air outlet 90 of c is discharged, so that the airflow and noise derived from both ends of the housing 10 are consistent in airflow resistance and noise reduction ability, and can be achieved at the first air outlet 80 and the second air outlet 90. Good sound attenuation effect, the distribution of air flow and noise in the multiple chambers of the muffler 100 is more uniform.

The difference between the specific embodiment shown in Figure 7 and the muffler 100 in Embodiment 1 is that the muffler 100 is provided with an intake pipe 20 at the middle chamber b, and an exhaust pipe is provided at the first chamber a and the tail chamber c 30. The muffler 100 has a better noise reduction effect through the sudden change in the cross-sectional area of the pipeline, and the distribution of airflow and noise in the multiple chambers is more uniform.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying the indicated structure Or elements must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

In the description of this specification, references to the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific examples," or "some examples" are intended to mean that the implementation Specific features, structures, materials or characteristics described in an embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications, the scope of the present invention is defined by the claims and their equivalents.

Claims (10)

1. a kind of silencer, which is characterized in that including：Housing, air inlet pipe, exhaust pipe and standing wave tube, the air inlet pipe and institute At least one of exhaust pipe is stated equipped at least one standing wave tube, the standing wave tube is located at outside the housing, described to stay The outlet of the import of wave duct and the standing wave tube is along the axially spaced of the pipe set by it.

2. silencer according to claim 1, which is characterized in that the standing wave tube be linear tube, the standing wave tube into The outlet of mouth and the standing wave tube faces or is staggered in the axial direction.

3. silencer according to claim 1, which is characterized in that the number of the standing wave tube is multiple, the standing wave tube Length for L1, the spacing of the outlet of the import of the standing wave tube and the standing wave tube in the axial direction is L2, the multiple standing wave The value of the L1-L2 of pipe is different.

4. silencer according to claim 1, which is characterized in that multiple standing wave tubes are connected to the air inlet pipe and edge The circumferential direction of the air inlet pipe is evenly distributed with；And/or multiple standing wave tubes are connected to the exhaust pipe and along the circumferential direction of the exhaust pipe It is uniformly distributed.

5. according to the silencer described in any one of claim 1-4, which is characterized in that limit at least three in the housing The chamber being sequentially distributed in an axial direction, adjacent chamber are connected by multiple recirculation holes, and the two chambers positioned at outermost end are respectively First chamber and tail chamber, the chamber between first chamber and the tail chamber is intermediate cavity, and the air inlet pipe sequentially passes through The outlet of the multiple chamber and the air inlet pipe is connected with the tail chamber, the number of the exhaust pipe be it is multiple, it is described The import of multiple exhaust pipes is located in different chambers, and the air inlet pipe has what is be connected at least one of which intermediate cavity First bloop, the exhaust pipe have the second bloop, and second bloop passes through same with first bloop Intermediate cavity connects, and the chamber, the tail chamber where the import of the multiple exhaust pipe are located at first bloop respectively With the both sides of the intermediate cavity where second bloop.

6. according to the silencer described in any one of claim 1-4, which is characterized in that limit at least three in the housing The chamber being sequentially distributed in an axial direction, adjacent chamber are connected by multiple recirculation holes, and the two chambers positioned at outermost end are respectively First chamber and tail chamber, the outlet of the air inlet pipe are connected with the tail chamber, the import of the exhaust pipe and the first chamber Room is connected, and the side wall of the air inlet pipe has multiple first bloops, the multiple first bloop at least with except the tail One in multiple chambers outside chamber is connected.

7. according to the silencer described in any one of claim 1-4, which is characterized in that limited in the housing multiple along axis To the chamber being sequentially distributed, adjacent chamber is connected by multiple recirculation holes, the chamber headed by the two chambers difference of outermost end Room and tail chamber, the air inlet pipe sequentially pass through the multiple chamber and are connected with the tail chamber, and the air inlet pipe has Multiple first bloops being connected at least one of other chambers in addition to the tail chamber, the number of the exhaust pipe To be multiple, each exhaust pipe sequentially passes through the multiple chamber and is connected with the first chamber.

8. according to the silencer described in any one of claim 1-4, which is characterized in that further include the diversion pipe in housing And valve,

Multiple chambers being sequentially distributed in an axial direction are limited in the housing, the chamber headed by the two chambers difference of outermost end With tail chamber, the chamber between the first chamber and tail chamber is intermediate cavity, multiple chambers in addition to the tail chamber In adjacent chamber be connected by recirculation hole, the air inlet pipe sequentially passes through the multiple chamber, and the air inlet pipe goes out Mouthful be located in the tail chamber and by the valve of the cover on it selectively with the tail chamber, air inlet pipe tool Have multiple first bloops being connected with the intermediate cavity, the exhaust pipe pass through the multiple chamber and with the first chamber Room is connected, and the diversion pipe is located in the housing, and one end of the diversion pipe is connected with the first chamber and the other end It is connected with the tail chamber.

9. according to the silencer described in any one of claim 1-4, which is characterized in that limited in the housing multiple along axis To the chamber being sequentially distributed, multiple chambers are connected by recirculation hole, the chamber headed by the two chambers difference of outermost end Room and tail chamber, the chamber between the first chamber and tail chamber are intermediate cavity, and the number of the intermediate cavity is extremely Lack and sound-absorbing part is equipped in one and at least one intermediate cavity, the air inlet pipe sequentially passes through the multiple chamber, described The outlet of air inlet pipe is located in one of in intermediate cavity and is blocked, and the air inlet pipe has each in addition to the tail chamber Multiple first bloops that a chamber is connected, the exhaust pipe pass through the multiple chamber and are connected with the tail chamber, The outlet of the exhaust pipe is located at outside the housing, the exhaust pipe sequentially pass through the tail chamber, the intermediate cavity and Detour is to stretch into the tail chamber in the intermediate cavity.

10. according to the silencer described in any one of claim 1-4, which is characterized in that limit multiple edges in the housing The chamber being axially sequentially distributed, adjacent chamber are connected by recirculation hole, the chamber headed by the two chambers difference of outermost end It is middle part chamber positioned at intermediate chamber with tail chamber, the head chambers and the tail chamber are respectively equipped with what is be in communication with the outside First gas outlet and the second gas outlet, the air inlet pipe are stretched into the housing and are connected with the middle part chamber, the row The number of tracheae is two, and the import of one of exhaust pipe is connected with a chamber of the side positioned at the intermediate cavity It is logical, and outlet is formed as first gas outlet, the import of another exhaust pipe and the opposite side positioned at the middle part chamber One chamber, which is connected and exports, is formed as second gas outlet.