CN215983185U - Silencer and air conditioner - Google Patents

Abstract

The application provides a muffler and an air conditioner, comprising an inner cylinder, a muffler channel is opened on the cylinder wall of the inner cylinder; an outer cylinder, the outer cylinder is rotatably sleeved on the outer circumference of the inner cylinder, and the inner cylinder and the outer cylinder cooperate to form a resonance cavity wherein, the outer cylinder is provided with an adjustment piece covering the muffler channel in the resonance cavity, and the adjustment piece adjusts the size of the muffler channel with the rotation of the outer cylinder to change the resonance frequency of the muffler. In the present application, the outer cylinder is rotatably sleeved on the outer circumference of the inner cylinder, and a resonance cavity is formed between the inner cylinder and the outer cylinder. , the adjustment member adjusts the size of the muffler channel with the rotation of the outer cylinder, thereby changing the resonance frequency of the muffler, thus realizing a muffler whose resonance frequency can be adjusted by the rotation of the outer cylinder, so that the resonance frequency of the muffler and the peak frequency of the transmitted sound are realized. Similar or the same, so as to ensure the noise reduction effect of the muffler.

Description

Silencer and air conditioner

Technical Field

The application relates to the technical field of noise reduction, in particular to a silencer and an air conditioner.

Background

At present, in the working process of an air conditioner, the condition of sound transmission often occurs, namely, the noise of an outdoor unit is transmitted to an indoor unit through a connecting pipe, the sound source of the noise is divided into structure transmission and in-pipe air flow transmission, wherein the air flow transmission refers to the noise of the outdoor unit and is transmitted by the noise of a compressor and the pulsation of air flow through a refrigerant in a pipeline, and the connecting pipe is transmitted to the indoor unit, so that other abnormal noises exist in the indoor unit.

In the prior art, in order to solve the problem of air flow transmission sound, a silencer is added in an external machine pipeline, but the frequency of the peak value of the transmission sound can be more than one, and also can be more than one or more than one frequency, and the selection and experiment of the silencer can take a lot of time and cost.

SUMMERY OF THE UTILITY MODEL

The application provides a silencer and an air conditioner, and aims to solve the technical problem that at present, the silencer is fixed in silencing frequency, so that selection and experiments of the silencer can spend a large amount of time and cost.

In a first aspect, the present application provides a muffler comprising:

the wall of the inner cylinder is provided with a silencing channel;

the outer cylinder is rotatably sleeved on the periphery of the inner cylinder, and the inner cylinder and the outer cylinder are matched to form a resonant cavity;

the outer barrel is internally provided with an adjusting piece for shielding the silencing channel in the resonant cavity, and the adjusting piece adjusts the size of the silencing channel along with the rotation of the outer barrel so as to change the resonance frequency of the silencer.

In some embodiments, the device further comprises an adjusting cylinder, one end of the outer cylinder is in contact with the outer wall surface of the inner cylinder to form a sealed end, and the other end of the outer cylinder is arranged at an interval with the outer wall surface of the inner cylinder to form an open end;

the adjusting cylinder is embedded in the open end and can move along the axis of the inner cylinder so as to adjust the size of the resonant cavity along with the movement of the adjusting cylinder.

In some embodiments, the inner wall surface of the outer cylinder is provided with a first internal thread, and the outer wall surface of the inner cylinder is provided with a first external thread;

the outer wall surface of the adjusting cylinder is provided with a second external thread screwed with the first internal thread, and the inner wall surface of the adjusting cylinder is provided with a second internal thread screwed with the first external thread.

In some embodiments, the first external thread is also screwed with a first nut, and the first nut is contacted with one end of the adjusting cylinder far away from the outer cylinder;

the second external thread is also screwed with a second nut, and the second nut is contacted with one end of the outer barrel, which is far away from the sealing end.

In some embodiments, a closed annular chamber is arranged inside the barrel body of the adjusting barrel;

the contact part of the outer cylinder and the inner cylinder is provided with a sealing ring.

In some embodiments, the sound-deadening passage includes a plurality of sub-sound-deadening passages arranged at intervals, and the regulating member includes a sub-regulating member corresponding to each sub-sound-deadening passage.

In some embodiments, an annular partition is disposed between adjacent sub-muffling passages;

one side of the annular partition plate is connected with the inner wall surface of the outer cylinder, and the other side of the annular partition plate is attached to the outer wall surface of the inner cylinder so as to divide the resonant cavity into a plurality of sub-resonant cavities; or

One side of the annular partition plate is connected with the outer wall surface of the inner cylinder, and the other side of the annular partition plate is attached to the inner wall surface of the outer cylinder so as to divide the resonant cavity into a plurality of sub-resonant cavities.

In some embodiments, each of the sub-muffling passages is the same size, and each of the sub-resonance chambers is different in size; or

The sizes of the sub-silencing passages are different, and the sizes of the sub-resonance cavities are the same.

In some embodiments, the sound attenuating passageway comprises a strip-shaped aperture disposed annularly about the inner barrel axis;

the adjusting piece comprises a fan-shaped partition plate corresponding to the size of the strip-shaped hole, and at least part of the end face, facing the strip-shaped hole, of the fan-shaped partition plate is attached to the outer wall surface of the inner barrel.

In a second aspect, the present application provides an air conditioner comprising a silencer as in the first aspect.

This application locates the inner tube periphery through the rotatable cover of urceolus, and the cooperation forms the resonant cavity between inner tube and urceolus, be provided with the adjusting part that shelters from the amortization passageway in the resonant cavity at the urceolus, when the urceolus rotated, the adjusting part adjusted amortization passageway size along with the rotation of urceolus, and then changed the resonant frequency of silencer, thereby realized that a resonant frequency can rotate and the silencer of adjusting through the urceolus, make the resonant frequency of silencer be close or the same with transmission sound peak frequency, thereby reach best amortization state.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of a muffler structure provided in an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view taken at A-A of FIG. 1 as provided in an embodiment of the present application;

FIG. 3 is a schematic structural view of an inner barrel provided in an embodiment of the present application;

FIG. 4 is a schematic structural view of the outer barrel provided in the embodiment of the present application;

FIG. 5 is a schematic cross-sectional view taken at B-B of FIG. 4 as provided in an embodiment of the present application;

FIG. 6 is a schematic view of an internal structure of the outer tub provided in the embodiment of the present application;

FIG. 7 is a schematic diagram of a structure of an adjustment barrel provided in an embodiment of the present application;

FIG. 8 is a schematic cross-sectional view taken at C-C of FIG. 7 as provided in an embodiment of the present application;

fig. 9 is another schematic cross-sectional view at a-a in fig. 1 provided in an embodiment of the present application.

The device comprises an inner cylinder 10, a silencing passage 11, a strip-shaped hole 111, a sub-silencing passage 112, a first external thread 12, an outer cylinder 20, a sealed end 210, an open end 220, an adjuster 21, a fan-shaped partition plate 211, a sub-adjuster 212, a first internal thread 22, a resonant cavity 30, a sub-resonant cavity 31, an adjuster 40, a second external thread 41, a second internal thread 42, an annular partition plate 50, an annular chamber 60, a sealing ring 70, a first nut 80 and a second nut 90.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the utility model. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known structures and processes are not shown in detail to avoid obscuring the description of the utility model with unnecessary detail. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

The embodiment of the application provides a silencer and an air conditioner, which are particularly suitable for silencing an internal and external machine connecting pipe of the air conditioner, and the details are respectively described below.

First, referring to fig. 1 and fig. 2, fig. 1 shows a schematic structural diagram of a silencer in an embodiment of the present application, and fig. 2 shows a schematic cross-sectional diagram at a-a in fig. 1 in an embodiment of the present application, where the silencer includes:

the inner cylinder 10, the wall of the inner cylinder 10 is equipped with a silencing channel 11;

the outer cylinder 20, the outer cylinder 20 is rotatably sleeved on the periphery of the inner cylinder 10, and the inner cylinder 10 and the outer cylinder 20 are matched to form a resonant cavity 30;

the outer cylinder 20 is provided with an adjusting member 21 for shielding the muffling channel 11 in the resonant cavity 30, and the adjusting member 21 adjusts the size of the muffling channel 11 along with the rotation of the outer cylinder 20 to change the resonant frequency of the muffler.

Specifically, the inner cylinder 10 has an air flow passage therein, and the wall of the cylinder is provided with a noise reduction passage 11, so that when air flows in the inner cylinder 10 to generate noise, the resonant cavity 30 communicated with the air flow passage through the noise reduction passage 11 resonates with the air noise to eliminate the noise. Referring to fig. 3, fig. 3 is a schematic structural diagram of an inner tube 10 according to an embodiment of the present invention, and the inner tube 10 may be a component of a connection pipe between an indoor unit and an outdoor unit of an air conditioner to eliminate noise of the connection pipe between the indoor unit and the outdoor unit of the air conditioner.

It will be appreciated that the inner barrel 10 can also be other ducts through which air can flow, such as the exhaust pipe of an automobile engine, the fresh air pipe of a fresh air system, etc.

The outer cylinder 20 is used to cooperate with the inner cylinder 10 to form a resonant cavity 30, and when sound waves enter the resonant cavity 30, a part of sound energy is reflected back to the sound source to be cancelled due to the sudden change of acoustic impedance. Meanwhile, under the action of the sound wave, the air column in the resonant cavity 30 generates resonance, and the frictional damping during the resonance converts a part of the sound energy into heat energy to be dissipated, so that the radiation quantity of the sound energy is reduced, and the aim of eliminating the noise is fulfilled.

Referring to fig. 4, 5 and 6, fig. 4 shows a schematic structural diagram of the outer barrel 20 in the embodiment of the present application, fig. 5 shows a schematic sectional diagram at B-B in fig. 4 in the embodiment of the present application, and fig. 6 shows a schematic internal structural diagram of the outer barrel 20 in the embodiment of the present application. Wherein, the outer cylinder 20 is rotatably sleeved on the outer periphery of the inner cylinder 10, the outer cylinder 20 is provided with an adjusting piece 21 for shielding the silencing channel 11 in the resonant cavity 30, the adjusting piece 21 can adjust the size of the silencing channel 11 along with the rotation of the outer cylinder 20, so as to change the resonance frequency of the silencer, so that the resonance frequency of the silencer is close to or the same as the peak frequency of the transmitted sound, the amplitude can reach the maximum value when the sound wave resonates with the air column, the reciprocating motion speed of the air column reaches the maximum value, so as to maximize the friction loss, and the absorbed sound energy also reaches the maximum value.

Specifically, the resonant frequency f of the muffler can be calculated by the following formula:

wherein C is the sound velocity, A is the cross-sectional area of the muffling channel 11, V is the cavity volume of the resonant cavity 30, and L is the effective length of the muffling channel 11.

This application locates the inner tube 10 periphery through the rotatable cover with urceolus 20 to the cooperation forms resonant cavity 30 between inner tube 10 and urceolus 20, be provided with the adjusting part 21 that shelters from amortization passageway 11 in resonant cavity 30 at urceolus 20, when urceolus 20 rotated, adjusting part 21 adjusted amortization passageway 11 size along with the rotation of urceolus 20, and then changed the resonant frequency of silencer, thereby realized that a resonant frequency can rotate and the silencer of adjusting through urceolus 20, make the resonant frequency of silencer be close to or the same with transmission sound peak frequency, thereby reach best amortization state.

Further, in order to widen the adjustment range of the resonant frequency of the silencer, refer to fig. 1, fig. 2 and fig. 4, wherein the silencer further includes an adjusting cylinder 40, one end of the outer cylinder 20 contacts with the outer wall surface of the inner cylinder 10 to form a sealed end 210, the other end is spaced from the outer wall surface of the inner cylinder 10 to form an open end 220, the adjusting cylinder 40 is embedded in the open end 220, and the adjusting cylinder 40 can move along the axis of the inner cylinder 10 to adjust the size of the resonant cavity 30 along with the movement of the adjusting cylinder 40.

In the above embodiment, the adjusting cylinder 40 is inserted into the open end 220 and seals the open end 220, so as to form the sealed resonant cavity 30, since the adjusting cylinder 40 can move along the axis of the inner cylinder 10, the volume of the resonant cavity 30 is changed, and finally the purpose of changing the resonant frequency of the muffler is achieved, in combination with the embodiment in which the adjusting member 21 changes the size of the muffling channel 11, the size of the muffling channel 11 and the volume of the resonant cavity 30 can be changed at the same time, so as to expand the resonant frequency adjusting range of the widened muffler, so that the muffler can perform noise elimination on noise with lower or higher frequency.

It will be appreciated that both ends of the outer barrel 20 can be sealed ends 210 and contact the outer wall surface of the inner barrel 10 to form a seal, thereby forming a fixed volume resonant cavity 30.

Further, in some embodiments of the present application, for example, for embodiments in which the muffler further includes the adjusting cylinder 40, referring to fig. 1, 3, 4 and 7, in order to ensure the sealing property of the open end 220, fig. 7 shows a schematic structural diagram of the adjusting cylinder 40 in the embodiments of the present application, specifically, the inner wall surface of the outer cylinder 20 is provided with a first internal thread 22, the outer wall surface of the inner cylinder 10 is provided with a first external thread 12, the outer wall surface of the adjusting cylinder 40 is provided with a second external thread 41 screwed with the first internal thread 22, and the inner wall surface of the adjusting cylinder 40 is provided with a second internal thread 42 screwed with the first external thread 12. The first female screw 22 and the first male screw 12 are screwed to form a plurality of sealing surfaces, and the second female screw 42 and the second male screw 41 are screwed to form a plurality of sealing surfaces, thereby achieving sealing between the inner wall surface of the outer cylinder 20 and the outer wall surface of the adjustment cylinder 40, and between the outer wall surface of the inner cylinder 10 and the inner wall surface of the adjustment cylinder 40.

It is understood that the sealing between the inner wall surface of the outer cylinder 20 and the outer wall surface of the adjustment cylinder 40, and the outer wall surface of the inner cylinder 10 and the inner wall surface of the adjustment cylinder 40 can be achieved in other manners, such as the sealing ring 70; alternatively, a sealing ring 70 may be provided at a contact portion of the outer cylinder 20 and the inner cylinder 10 to seal the sealing end 210.

Further, the adjusting cylinder 40 and the outer cylinder 20 are prevented from being rotated randomly during operation, and with reference to fig. 1 and fig. 2, the first external thread 12 is further screwed with a first nut 80, and the first nut 80 is in contact with one end of the adjusting cylinder 40 away from the outer cylinder 20; the second external thread 41 is further threaded with a second nut 90, and the second nut 90 contacts an end of the outer barrel 20 away from the sealing end 210. When the silencer works, the first nut 80 is abutted against the open end 220 of the outer cylinder 20, the second nut 90 is abutted against one end of the adjusting cylinder 40, and the phenomenon that the resonant frequency is changed due to the fact that the adjusting cylinder 40 and the outer cylinder 20 rotate due to noise vibration can be avoided due to the influence of friction force between the end face of the nut and the end faces of the outer cylinder 20 and the adjusting cylinder 40.

As an exemplary structure of the sound attenuation channel 11 and the adjusting member 21, refer to fig. 3 and 6, wherein the sound attenuation channel 11 includes a strip-shaped hole 111 annularly disposed around the axis of the inner cylinder 10, the adjusting member 21 includes a fan-shaped partition 211 corresponding to the size of the strip-shaped hole 111, and an end surface of the fan-shaped partition 211 facing the strip-shaped hole 111 is at least partially attached to an outer wall surface of the inner cylinder 10. In the rotating process of the outer cylinder 20, the end surface part of the fan-shaped partition board 211 facing the strip-shaped hole 111 is attached to the outer wall surface of the inner cylinder 10, the other part covers the strip-shaped hole 111, and along with the continuous rotating cylinder of the outer cylinder 20, the fan-shaped partition board 211 can completely cover the strip-shaped hole 111 or can completely open the strip-shaped hole 111, so that the size of the silencing channel 11 is changed.

It can be understood that the muffling channel 11 and the adjusting member 21 can be in other shapes, for example, the muffling channel 11 is a circular hole, the adjusting member 21 is a cylinder corresponding to the circular hole, and the cylinder shields a part of the muffling hole to change the size of the muffling channel 11.

With continued reference to fig. 8, fig. 8 shows a schematic cross-sectional view at C-C of the embodiment of the present application, wherein a closed annular chamber 60 is disposed inside the barrel of the adjusting barrel 40, and the closed annular chamber 60 forms an air-borne noise chamber, which is advantageous for noise elimination of the silencer noise due to the large energy consumption of the air-borne noise.

Further, in order to further expand the adjustment range of the muffling frequency, in some embodiments of the present application, referring to fig. 9, fig. 9 shows another schematic cross-sectional view at a-a in fig. 1 of the present application, where the muffling channel 11 includes a plurality of sub-muffling channels 112 disposed at intervals, the adjusting member 21 includes a sub-adjusting member 212 corresponding to each sub-muffling channel 112, and since the plurality of sub-muffling channels 112 and the plurality of sub-adjusting members 212 are disposed, the maximum value of the muffling channel 11 is further expanded, the adjustment range of the muffling frequency can be further expanded, so as to perform muffling for noise with higher frequency.

Further, in some embodiments of the present application, for example, for the embodiment where the muffling channel 11 includes a plurality of sub-muffling channels 112 arranged at intervals, and the adjusting member 21 includes a sub-adjusting member 212 corresponding to each sub-muffling channel 112, in order to facilitate noise cancellation for noises with multiple frequencies, continuing to refer to fig. 9, an annular partition plate 50 is disposed between adjacent sub-muffling channels 112, and the annular partition plate 50 can divide the resonant cavity 30 into a plurality of sub-resonant cavities 31, and different sub-resonant cavities 31 have different resonant frequencies, so that noise cancellation can be performed for noises with different frequencies.

Generally, one side of the annular partition 50 is connected to the inner wall surface of the outer cylinder 20, and the other side is attached to the outer wall surface of the inner cylinder 10, thereby dividing the resonant cavity 30 into a plurality of sub-resonant cavities 31. It can be understood that the annular partition 50 can also be connected with the outer wall surface of the inner cylinder 10 on one side and attached to the inner wall surface of the outer cylinder 20 on the other side; or, an independent annular partition plate 50 is provided, and both sides of the annular partition plate are respectively attached to the outer wall surface of the inner cylinder 10 and the inner wall surface of the outer cylinder 20, so as to divide the resonant cavity 30 into a plurality of sub-resonant cavities 31.

Further, in order to make each sub-resonant cavity 31 have different resonant frequencies, the size of each sub-muffling channel 112 is the same, and the size of each sub-resonant cavity 31 is different; or the size of each sub-resonance cavity 31 is the same, and the resonance frequency of each sub-resonance cavity 31 can be changed by changing the size of each sub-resonance cavity 31 and the size of each sub-resonance cavity 112.

It is understood that the sub-resonant cavities 31 and the sub-muffling channels 112 may also have different sizes, for example, multiple sets of sub-resonant cavities 31 and sub-muffling channels 112 are sequentially enlarged to make the resonant frequency of each sub-resonant cavity 31 different.

It should be noted that the above-mentioned contents of the silencer are for clearly showing the verification process of the present invention, and those skilled in the art can make equivalent modifications under the guidance of the present application, for example, both ends of the outer cylinder 20 can be set as the open ends 220 and respectively embedded into the adjusting cylinders 40, so as to realize the bidirectional adjustment of the resonant cavity 30.

Further, in order to better implement the silencer in the embodiments of the present application, on the basis of the silencer, an embodiment of the present application further provides an air conditioner, and the air conditioner includes the silencer in any one of the embodiments as described above. The air conditioner in this application embodiment is because of being provided with the muffler of above-mentioned embodiment to have the whole beneficial effect of above-mentioned muffler structure, no longer describe herein.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and parts that are not described in detail in a certain embodiment may refer to the above detailed descriptions of other embodiments, and are not described herein again.

Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing detailed disclosure is to be considered merely illustrative and not restrictive of the broad application. Various modifications, improvements and adaptations to the present application may occur to those skilled in the art, although not explicitly described herein. Such modifications, improvements and adaptations are proposed in the present application and thus fall within the spirit and scope of the exemplary embodiments of the present application.

Also, this application uses specific language to describe embodiments of the application. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application is included in at least one embodiment of the present application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.

Similarly, it should be noted that in the preceding description of embodiments of the present application, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the embodiments. This method of disclosure, however, is not intended to require more features than are expressly recited in the claims. Indeed, the embodiments may be characterized as having less than all of the features of a single embodiment disclosed above.

Numerals describing the number of components, attributes, etc. are used in some embodiments, it being understood that such numerals used in the description of the embodiments are modified in some instances by the use of the modifier "about", "approximately" or "substantially". Unless otherwise indicated, "about", "approximately" or "substantially" indicates that the number allows a variation of ± 20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximations that may vary depending upon the desired properties of the individual embodiments. In some embodiments, the numerical parameter should take into account the specified significant digits and employ a general digit preserving approach. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the range are approximations, in the specific examples, such numerical values are set forth as precisely as possible within the scope of the application.

For each patent, patent application publication, and other material cited in this application, such as articles, books, specifications, publications, documents, and the like, the entire contents of which are hereby incorporated by reference into this application, except for application history documents that are inconsistent with or conflict with the contents of this application, and except for documents that are currently or later become incorporated into this application as though fully set forth in the claims below. It is noted that the descriptions, definitions and/or use of terms in this application shall control if they are inconsistent or contrary to the present disclosure.

The present invention provides a silencer and an air conditioner, which are provided by the embodiments of the present invention, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the method and the core idea of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (10)

1. a silencer, is characterized in that, comprises: an inner cylinder, a muffler channel is opened on the cylinder wall of the inner cylinder; an outer cylinder, the outer cylinder is rotatably sleeved on the outer circumference of the inner cylinder, and the inner cylinder and the outer cylinder cooperate to form a resonance cavity; Wherein, the outer cylinder is provided with an adjustment member that blocks the muffler channel in the resonance cavity, and the adjustment member adjusts the size of the muffler channel with the rotation of the outer cylinder to change the resonance frequency of the muffler . 2 . The muffler according to claim 1 , further comprising an adjustment cylinder, one end of the outer cylinder is in contact with the outer wall surface of the inner cylinder to form a sealing end, and the other end is in contact with the outer wall surface of the inner cylinder. 3 . spaced apart to form open ends; The adjustment cylinder is embedded in the open end, and the adjustment cylinder can move along the axis of the inner cylinder to adjust the size of the resonance cavity with the movement of the adjustment cylinder. 3. The muffler according to claim 2, wherein the inner wall surface of the outer cylinder is provided with a first inner thread, and the outer wall surface of the inner cylinder is provided with a first outer thread; The outer wall surface of the adjustment cylinder is provided with a second external thread screwed with the first internal thread, and the inner wall surface of the adjustment cylinder is provided with a second internal thread screwed with the first external thread. 4. The muffler according to claim 3, wherein the first external thread is further screwed with a first nut, and the first nut is in contact with an end of the adjusting cylinder away from the outer cylinder; The second external thread is also screwed with a second nut, and the second nut is in contact with the end of the outer cylinder away from the sealing end. 5 . The muffler according to claim 2 , wherein a closed annular chamber is arranged inside the barrel of the adjusting barrel. 6 . 6 . The muffler of claim 1 , wherein the muffler channel comprises a plurality of sub-muffler channels arranged at intervals, and the adjustment member comprises a sub-adjustment member corresponding to each of the sub-muffler channels. 7 . 7. The muffler according to claim 6, wherein an annular partition is arranged between the adjacent sub-muffler passages; One side of the annular partition is connected to the inner wall surface of the outer cylinder, and the other side is attached to the outer wall surface of the inner cylinder, so as to divide the resonant cavity into a plurality of sub-resonant cavities; or One side of the annular baffle is connected with the outer wall surface of the inner cylinder, and the other side is attached to the inner wall surface of the outer cylinder, so as to divide the resonant cavity into a plurality of sub-resonant cavities. 8. The muffler according to claim 7, wherein the size of each of the sub-muffler channels is the same, and the size of each of the sub-resonance cavities is different; or The size of each of the sub-muffler channels is different, and the size of each of the sub-resonance cavities is the same. 9. The muffler of claim 1, wherein the muffler channel comprises a strip hole annularly arranged around the axis of the inner cylinder; The adjusting member includes a fan-shaped partition plate corresponding to the size of the strip-shaped hole, and the end surface of the fan-shaped partition plate facing the strip-shaped hole is at least partially abutted with the outer wall surface of the inner cylinder. 10. An air conditioner comprising the muffler according to any one of claims 1 to 9.

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