Silencing device, air conditioner outdoor unit and noise reduction control method of air conditioner outdoor unit

Abstract

The invention discloses a silencing device, an air conditioner outdoor unit and a noise reduction control method of the air conditioner outdoor unit. The silencing device comprises a shell, a silencing cavity is formed in the inner side of the shell, and the top of the silencing cavity is open; the silencing assembly comprises a silencing pipe, the silencing pipe is contained in the silencing cavity, and one end of the silencing pipe extends towards the top of the silencing cavity and is open. According to the silencing device, the sound waves can be transmitted into the silencing cavity through the silencing pipe for resonance to dissipate energy of the sound waves, efficient absorption of noise in the environment is achieved, and the air conditioner outdoor unit with the silencing device is lower in noise during operation and better in user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a muffler, an air conditioner outdoor unit and a noise reduction control method thereof. Background Art

[0002] In the air conditioner outdoor unit, the compressor is the main moving component. During operation, it will generate vibration and noise problems. The vibration and noise will be transmitted along the pipeline and the shell to the entire outdoor unit structure. When the frequency of the compressor is close to the value of the pipeline modal frequency, serious vibration and noise problems will occur. The vibration of the pipeline will cause certain deformation of the structure, reducing the reliability of the system. In the prior art, it is common to add pipeline counterweights to reduce the pipeline modal frequency, so that the compressor excitation frequency and the pipeline resonance frequency are staggered to avoid resonance. Although adding counterweights can solve some vibration and noise problems, it may cause resonance of other pipeline frequencies. Its reliability is not high, and the overall noise reduction effect is not ideal. Summary of the invention

[0003] Provided are a silencer device, an air conditioner outdoor unit and a noise reduction control method thereof, to solve the problem that the air conditioner outdoor unit has an unsatisfactory noise reduction effect when using a traditional noise reduction method.

[0004] In a first aspect, an embodiment of the present invention provides a muffler device, comprising:

[0005] A shell body, an inner side of which is formed with a muffler cavity, and the top of the muffler cavity is open;

[0006] The muffler assembly comprises a muffler pipe, which is received in the muffler cavity and has one end extending toward the top of the muffler cavity and opening.

[0007] In the silencer device provided in an embodiment of the present invention, a plurality of silencer cavities are formed, and the plurality of silencer cavities are arranged adjacent to each other in pairs on the same horizontal plane on the inner side of the shell. One end of the silencer pipe is arranged at the bottom of the silencer cavity, and the other end extends toward the top of the silencer cavity.

[0008] In the silencer device provided in an embodiment of the present invention, at least two of the silencer cavities are arranged at intervals along a first direction on the inner side of the shell, and at least two of the silencer cavities are arranged at intervals along a second direction on the inner side of the shell, wherein the first direction is perpendicular to the second direction.

[0009] In the silencer device provided in the embodiment of the present invention, the silencer pipe is a spiral pipe, and the silencer pipe spirally extends toward the top of the silencer cavity.

[0010] In the silencer device provided in an embodiment of the present invention, the silencer assembly also includes an adjustment assembly, the silencer pipe includes a first pipe segment and a second pipe segment, the adjustment assembly is arranged at the bottom of the silencer cavity, the first pipe segment is arranged on the adjustment assembly, one end of the second pipe segment is telescopically connected to the first pipe segment, and the other end extends toward the top of the silencer cavity, wherein the adjustment assembly is used to drive the second pipe segment to telescopically move along the axial direction of the first pipe segment to lengthen or shorten the silencer pipe.

[0011] In the silencer device provided in an embodiment of the present invention, the adjustment assembly includes a rotating drive member and a base shell, a through hole is provided at the top of the base shell, the first pipe segment is accommodated in the base shell, the end of the second pipe segment passes through the through hole and is threadedly sleeved with the first pipe segment, the rotating drive member is provided in the base shell and is connected to the first pipe segment, wherein the rotating drive member is used to drive the first pipe segment to rotate so as to drive the second pipe segment to move relative to the first pipe segment along the axial direction of the first pipe segment.

[0012] In the silencer device provided in the embodiment of the present invention, the silencer device further includes a porous sound absorbing member, and the porous sound absorbing member is filled in the top of the silencer cavity.

[0013] In a second aspect, an embodiment of the present invention provides an air conditioner outdoor unit, which includes the silencer device described in the first aspect.

[0014] In the air conditioner outdoor unit provided in an embodiment of the present invention, the air conditioner outdoor unit also includes a casing and a compressor, the compressor is arranged in the casing, the shell part of the silencer device is arranged in the casing and the open part of the silencer cavity of the silencer device is adjacent to the compressor.

[0015] In a third aspect, an embodiment of the present invention provides a noise reduction control method for an air conditioner outdoor unit, the method comprising: detecting the noise frequency of compressor pipeline vibration; and controlling an adjustment component to adjust the length of a silencer pipe according to the noise frequency of the compressor pipeline vibration.

[0016] The present invention provides a silencer, an air conditioner outdoor unit and a noise reduction control method thereof, wherein the silencer comprises a shell and a silencer assembly; the shell has a silencer cavity formed inside thereof, and the top of the silencer cavity is open; the silencer assembly comprises a silencer pipe, and the silencer pipe is received in the silencer cavity and one end thereof extends and opens toward the top of the silencer cavity. The silencer device of the present application is provided with a silencer cavity inside the shell, and a silencer pipe is provided inside the silencer cavity, and one end of the silencer pipe extends and opens toward the top of the silencer cavity, so that sound waves are transmitted through the silencer pipe into the silencer cavity for resonance to dissipate the energy of the sound waves, thereby achieving efficient absorption of noise in the environment. The air conditioner outdoor unit using the silencer device has lower noise during operation and better user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0018] Figure 1 A schematic diagram of the structure of a muffler provided in an embodiment of the present invention;

[0019] Figure 2 A three-dimensional diagram of a housing provided by an embodiment of the present invention;

[0020] Figure 3 An assembly diagram of a muffler assembly provided in an embodiment of the present invention;

[0021] Figure 4 A schematic diagram of the silencing principle of the silencing device provided in an embodiment of the present invention;

[0022] Figure 5 A three-dimensional diagram of a muffler assembly provided by an embodiment of the present invention;

[0023] Figure 6 A partial cross-sectional view of a muffler provided in an embodiment of the present invention;

[0024] Figure 7 A partial cross-sectional view of a muffler assembly provided in an embodiment of the present invention;

[0025] Figure 8 An exploded view of a muffler assembly provided in an embodiment of the present invention;

[0026] Fig. 9 A three-dimensional diagram of a porous sound absorbing member provided in an embodiment of the present invention;

[0027] Fig.10 A three-dimensional diagram of an air conditioner outdoor unit provided by an embodiment of the present invention;

[0028] Fig.11 An assembly diagram of a muffler and a housing provided in an embodiment of the present invention;

[0029] Fig.12 An internal structural diagram of an air conditioner outdoor unit provided by an embodiment of the present invention;

[0030] Fig.13 A flowchart of the steps of the noise reduction control method of the air conditioner outdoor unit provided by an embodiment of the present invention;

[0031] The reference numerals in the figures are:

[0032] 100, silencer; 10, shell; 101, silencer cavity; 20, silencer assembly; 21, silencer pipe; 211, first pipe section; 212, second pipe section; 22, adjustment assembly; 221, base shell; 2210, through hole; 222, rotating drive member; 30, porous sound absorbing member; 200, air conditioner outdoor unit; 201, casing; 202, compressor. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Reference Figures 1 to 9 , which shows an embodiment of the muffler device 100 provided by the present invention. The structure and working principle of the muffler device 100 are described in detail below in conjunction with the drawings of the specification. The muffler device 100 includes a shell 10 and a muffler assembly 20; the shell 10 has a muffler cavity 101 formed inside, and the top of the muffler cavity 101 is open; the muffler assembly 20 includes a muffler pipe 21, and the muffler pipe 21 is accommodated in the muffler cavity 101 and one end of the muffler pipe 21 extends toward the top of the muffler cavity 101 and is open.

[0035] In a specific implementation, the silencer 100 can be applied to noise reduction in any noise scene. For example, the silencer 100 can be applied to an air conditioner outdoor unit to achieve noise reduction for the air conditioner outdoor unit. In this embodiment, the silencer 100 includes a shell 10 and a silencer assembly 20. The shell 10 has an arbitrary shape. A silencer cavity 101 is formed on the inner side of the shell 10. The silencer cavity 101 is a cavity structure on the inner side of the shell 10. The silencer cavity 101 can be a cavity structure of any shape. The silencer cavity 101 has a certain volume. The silencer assembly 20 is disposed as a whole in the silencer cavity 101. The silencer assembly 20 includes a silencer pipe 21. The silencer pipe 21 is a pipe structure with a certain length. The shape of the silencer pipe 21 is not limited and can be a pipe structure of any shape. It can be designed as a straight pipe structure or a curved pipe structure. The muffler tube 21 is entirely accommodated in the muffler cavity 101, and one end of the muffler tube 21 extends toward the top of the muffler cavity 101 and is open, so that the internal space of the muffler tube 21 is connected to the muffler cavity 101 and the outside of the shell 10. In practical applications, when the muffler device 100 is in an environment with noise, the noise in the environment will be transmitted through the air medium, such as Figure 4As shown, according to the principle of Helmholtz resonance silencing, when sound waves are transmitted in the main pipe A, part of the sound waves will be transmitted along the silencer pipe 21 to the silencer cavity 101, and the other part of the sound waves will be transmitted to the downstream of the main pipe A. The sound waves transmitted to the silencer cavity 101 will resonate with the air medium in the silencer cavity 101, and the energy of the resonant part of the sound waves will be dissipated, thereby greatly weakening the sound wave energy passing through the silencer 100, thereby achieving efficient absorption of noise in the environment and noise reduction.

[0036] The silencer device in this embodiment is configured by setting a silencer cavity on the inner side of the shell, and setting a silencer pipe in the silencer cavity, with one end of the silencer pipe extending toward the top of the silencer cavity and opening it, so that sound waves are transmitted into the silencer cavity through the silencer pipe for resonance to dissipate the energy of the sound waves, thereby achieving efficient absorption of noise in the environment and better noise reduction effect.

[0037] In one embodiment, referring to Figures 1 to 3 , there are several silencer cavities 101, and the several silencer cavities 101 are arranged adjacent to each other in pairs on the same horizontal plane inside the shell 10, and one end of the silencer pipe 21 is arranged at the bottom of the silencer cavity 101, and the other end extends toward the top of the silencer cavity 101. In a specific implementation, there are several silencer cavities 101 formed on the inner side of the shell 10, and the specific number can be designed according to the application scenario. For example, in some application scenarios with relatively large noise, the number of silencer cavities 101 can be set more. Several silencer cavities 101 are arranged adjacent to each other in pairs on the same horizontal plane inside the shell 10, and all the silencer cavities 101 are open in the same direction, and a certain distance is maintained between two adjacent silencer cavities 101. Each muffler cavity 101 has a muffler assembly 20, one end of the muffler pipe 21 of the muffler assembly 20 is arranged at the bottom of the muffler cavity 101, and the other end extends toward the top of the muffler cavity 101, so that the muffler pipe 21 as a whole can have a longer length in the muffler cavity 101. Each muffler cavity 101 cooperates with the muffler pipe 21 to have an independent noise reduction function. Through the cooperation of several muffler cavities 101, the muffler bandwidth of the muffler device can be effectively widened, the energy of the sound wave energy can be greatly reduced, the noise can be greatly weakened, and the noise reduction ability can be improved.

[0038] Further, refer to Figure 2 At least two of the muffler cavities 101 are arranged at intervals along a first direction on the inner side of the shell 10, and at least two of the muffler cavities 101 are arranged at intervals along a second direction on the inner side of the shell 10, wherein the first direction and the second direction are perpendicular to each other. In a specific implementation, there are a plurality of muffler cavities 101 formed on the inner side of the shell 10, and the muffler cavities 101 are arranged in a crisscross manner, such as Figure 2As shown, the x direction represents the first direction, and the y direction represents the second direction. At least two muffler cavities 101 are arranged at intervals along the first direction on the inner side of the shell 10, and at least two muffler cavities 101 are arranged at intervals along the second direction on the inner side of the shell 10. The first direction and the second direction are perpendicular to each other. All the muffler cavities 101 are crisscrossed on the inner side of the shell 10. The number of muffler cavities 101 arranged in the first direction and the second direction can be set to be equal or unequal. In this embodiment, 5 muffler cavities 101 are set in the first direction on the inner side of the shell 10, and 2 muffler cavities 101 are set in the second direction on the inner side of the shell 10. By arranging the muffler cavities 101 in perpendicular directions, the muffler cavities 101 can evenly receive sound waves in the noise environment, and the muffler tubes 21 in the muffler cavities 101 can weaken the energy of the sound waves, thereby improving the effect of muffler noise reduction.

[0039] In one embodiment, referring to Figure 1 and Figure 3 , the muffler pipe 21 is a spiral pipe, and the muffler pipe 21 spirally extends toward the top of the muffler cavity 101. In a specific implementation, the length of the muffler pipe 21 in the muffler cavity 101 determines the muffler frequency of the muffler cavity 101. The longer the length of the muffler pipe 21 in the muffler cavity 101, the higher the muffler frequency of the muffler cavity 101. Therefore, in this embodiment, the muffler pipe 21 is designed as a spiral pipe structure, and the muffler pipe 21 as a whole spirally extends inside the muffler cavity 101 toward the top of the muffler cavity 101. The muffler pipe 21 with a spiral pipe structure is longer in the muffler cavity 101 as a whole. In actual applications, the higher the muffler frequency of the muffler cavity 101, the better the muffler noise reduction effect.

[0040] In one embodiment, referring to Figures 1 to 6The muffler assembly 20 also includes an adjusting assembly 22, and the muffler pipe 21 includes a first pipe section 211 and a second pipe section 212. The adjusting assembly 22 is arranged at the bottom of the muffler cavity 101, and the first pipe section 211 is arranged on the adjusting assembly 22. One end of the second pipe section 212 is telescopically connected to the first pipe section 211, and the other end extends toward the top of the muffler cavity 101, wherein the adjusting assembly 22 is used to drive the second pipe section 212 to telescopically move along the axial direction of the first pipe section 211 to extend or shorten the muffler pipe 21. In a specific implementation, the silencer assembly 20 also includes an adjustment assembly 22, which is entirely arranged at the bottom of the silencer cavity 101. The silencer pipe 21 consists of a first pipe section 211 and a second pipe section 212. The first pipe section 211 is entirely arranged in the adjustment assembly 22. One end of the second pipe section 212 is telescopically connected to the first pipe section 211. Both ends of the second pipe section 212 are transparent, so that the second pipe section 212 is connected to the interior of the first pipe section 211. The other end of the second pipe section 212 extends toward the top of the silencer cavity 101. Since the second pipe section 212 is retractable relative to the first pipe section 211, the adjustment component 22 can drive the second pipe section 212 to move along the axis of the first pipe section 211, so that the second pipe section 212 extends or retracts relative to the first pipe section 211, thereby extending or shortening the overall length of the muffler 21. The overall length of the muffler 21 can be changed by adjusting the component 22, so that the length of the muffler 21 can be variable, and the length of the muffler 21 in the muffler cavity 101 determines the muffler frequency of the muffler cavity 101. Figure 4 As shown, according to the principle of Helmholtz resonance silencing, when the sound wave is transmitted in the main pipeline A, part of the sound wave will be transmitted along the silencer pipe 21 to the silencer cavity 101, and the other part of the sound wave will be transmitted to the downstream of the main pipeline A, wherein the equation for the sound wave to be transmitted from the silencer pipe 21 to the silencer cavity 101 is:

[0041]

[0042] Among them, p3 is the sound pressure at the muffler 21, p5 is the sound pressure at the muffler cavity 101, Sc is the cross-sectional area of ​​the muffler 21, Sv is the cross-sectional area of ​​the muffler cavity 101, u3 is the particle vibration velocity at the muffler 21, u5 is the particle vibration velocity at the muffler cavity 101, lc is the length of the muffler 21, lv is the length of the muffler cavity 101, ρ is the air density, c is the speed of sound in the air, k is the wave number of the sound, combined with the boundary condition of the rigid wall of the muffler cavity 101, u5 = 0, the following equation can be obtained:

[0043]

[0044] As can be seen from the above formula, the transmission and dissipation of sound waves are functions of the length and radius of the muffler tube 21 and the length and radius of the muffler cavity 101, so changing the length of the muffler tube 21 can change the muffler frequency. Therefore, in different noise environments, by adjusting the telescopic distance of the second pipe section 212 relative to the first pipe section 211 by adjusting the component 22, and changing the overall length of the muffler tube 21 in the muffler cavity 101, the muffler effect in the corresponding noise environment can be achieved, and the muffler device 100 has a wider application range.

[0045] Further, refer to Figures 6 to 8 The adjusting assembly 22 includes a rotating driving member 222 and a base shell 221, a through hole 2210 is provided on the top of the base shell 221, the first pipe segment 211 is accommodated in the base shell 221, the end of the second pipe segment 212 passes through the through hole 2210 and is threadedly sleeved with the first pipe segment 211, the rotating driving member 222 is provided in the base shell 221 and connected to the first pipe segment 211, wherein the rotating driving member 222 is used to drive the first pipe segment 211 to rotate so as to drive the second pipe segment 212 to move relative to the first pipe segment 211 along the axial direction of the first pipe segment 211. In a specific implementation, the adjustment component 22 includes a rotating drive member 222 and a base shell 221. The rotating drive member 222 is integrally installed in the base shell 221. The rotating drive member 222 is specifically a motor. A through hole 2210 with a diameter equivalent to the outer diameter of the second pipe segment 212 is provided at the top of the base shell 221. The through hole 2210 passes through the inner and outer sides of the base shell 221. The first pipe segment 211 is integrally vertically arranged in the base shell 221 and is transmission-connected with the rotating drive member 222. The end of the second pipe segment 212 passes through the through hole 2210 and is threadedly sleeved with the first pipe segment 211. In this embodiment, the end of the second pipe segment 212 is threadedly sleeved on the inside of the first pipe segment 211. In other embodiments, the second pipe segment 212 can be threadedly sleeved on the outside of the first pipe segment 211. The rotary drive member 222 is used to drive the first pipe section 211 to rotate. Through the screw transmission, when the rotary drive member 222 drives the first pipe section 211 to rotate, the second pipe section 212 moves relative to the first pipe section 211 along the axial direction of the first pipe section 211 under the action of the screw transmission, so that the overall length of the muffler 21 can be changed. The actual moving direction of the second pipe section 212 depends on the direction in which the rotary drive member 222 drives the first pipe section 211 to rotate. In actual applications, the rotary drive member 222 can be controlled according to the noise environment to adjust the length of the muffler 21 in the muffler cavity 101 to meet the requirements of muffler noise reduction.

[0046] In one embodiment, referring to Fig. 9, the silencer 100 also includes a porous sound absorbing member 30, and the porous sound absorbing member 30 is filled in the top of the silencer cavity 101. In specific implementation, the silencer 100 also includes a porous sound absorbing member 30, and the porous sound absorbing member 30 can be designed with sound-absorbing sponge or other porous fiber materials, and its special structure can consume sound wave energy. The porous sound absorbing member 30 is filled in the top of the silencer cavity 101 as a whole, and keeps a certain distance from the silencer pipe 21. In actual applications, when the silencer 100 is in a noisy environment, before the sound wave is transmitted to the inside of the silencer cavity 101, the sound wave will first consume part of its energy by the porous sound absorbing member 30, and finally the silencer cavity 101 and the silencer pipe 21 cooperate to further consume energy, thereby achieving a better sound reduction effect.

[0047] In one embodiment, an air conditioner outdoor unit 200 is provided, referring to Fig.10 The air conditioner outdoor unit 200 applies the silencer 100 described in the above embodiment. The silencer 100 is used in the air conditioner outdoor unit 200 to eliminate the noise generated during the operation of the outdoor unit and improve the comfort of the air conditioner outdoor unit 200. Since the above embodiment has already made a detailed introduction to the specific structure and working principle of the silencer 100, they will not be repeated here.

[0048] Further, refer to Fig.11 and Fig.12 , the air conditioner outdoor unit 200 also includes a casing 201 and a compressor 202, the compressor 202 is arranged in the casing 201, the shell 10 of the silencer 100 is partially arranged in the casing 201 and the open part of the silencer cavity 101 of the silencer 100 is adjacent to the compressor 202. In a specific implementation, the air conditioner outdoor unit 200 includes a casing 201 and a compressor 202, the casing 201 is the outer shell structure of the air conditioner outdoor unit 200, mainly used to provide protection, the compressor 202 is a high-pressure component in the air conditioner outdoor unit 200, used to compress the refrigerant to achieve refrigeration, the compressor 202 is arranged inside the casing 201 as a whole, the shell 10 of the silencer 100 is partially arranged in the casing 201, and a part is outside the casing 201, and the open part of the silencer cavity 101 inside the shell 10 of the silencer 100 is adjacent to the compressor 202. The shell 10 of the silencer 100 is adjacent to the compressor 202, specifically, it is arranged to be adjacent to the pipeline of the compressor 202. On the whole, the silencer cavity 101 of the silencer device 100 is open to the internal space of the casing 201. The noise during the operation of the compressor 202 mainly comes from the pipeline vibration of the compressor 202. By partially arranging the shell 10 of the silencer 100 in the casing 201, the open part of the silencer cavity 101 on the inner side of the shell 10 of the silencer device 100 is adjacent to the compressor 202, so that the noise can be weakened at the noise source, thereby achieving better noise reduction effect.

[0049] The air conditioner outdoor unit in this embodiment uses the silencer device provided in the above embodiment, so the noise during operation is lower, the comfort of use is improved, and the user experience is better.

[0050] In one embodiment, a noise reduction control method for an air conditioner outdoor unit is provided. Fig.13 As shown, the method includes steps: S1-S2.

[0051] S1. Detect the noise frequency of compressor pipeline vibration.

[0052] In a specific implementation, a sound sensor and a controller are installed on the air conditioner outdoor unit. When the compressor pipeline vibrates, noise is generated. The sound sensor converts the sound into an electrical signal and transmits it to the controller for analysis, thereby obtaining the noise frequency when the compressor pipeline vibrates.

[0053] S2. Control the adjustment component to adjust the length of the muffler pipe according to the noise frequency of the compressor pipeline vibration.

[0054] In a specific implementation, when designing the controller system, the silencer performance of the silencer is firstly analytically calculated according to the size of the silencer cavity and the size of the silencer pipe of the silencer, and the initial silencer performance of the silencer is obtained. The particle swarm optimization algorithm is combined with the analytical prediction model to perform an optimization process to maximize the average absorption coefficient of the silencer pipes of different lengths in different ranges. The silencer pipe length parameters at the corresponding frequency are stored in the controller system, and then the length parameters of the silencer pipe at the maximum sound absorption coefficient at the corresponding frequency are stored in the controller system. The controller analyzes the signal sent back by the sound sensor to obtain the size of the noise frequency of the compressor pipeline vibration. The controller is connected to the adjustment component of the silencer, and the adjustment component of the silencer is controlled according to the noise frequency of the compressor pipeline vibration to adjust the length of the silencer pipe, thereby achieving the maximum silencer frequency of the silencer, wherein the specific process of the adjustment component adjusting the length of the silencer pipe can refer to the above-mentioned embodiment in the specification.

[0055] The noise reduction control method of the air-conditioning outdoor unit of the present embodiment detects the noise frequency of the compressor pipeline vibration, controls the adjustment component to adjust the length of the silencer pipe according to the noise frequency of the compressor pipeline vibration, and achieves the maximum silencer frequency of the silencer device, thereby effectively improving the noise reduction effect of the air-conditioning outdoor unit, making the air-conditioning outdoor unit quieter during operation and providing a better user experience.

[0056] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A muffler, characterized in that: include: A shell body, an inner side of which is formed with a muffler cavity, and the top of the muffler cavity is open; The muffler assembly comprises a muffler pipe, which is received in the muffler cavity and has one end extending toward the top of the muffler cavity and opening.

2. The muffler device according to claim 1, characterized in that: A plurality of the muffler cavities are formed, and the plurality of the muffler cavities are arranged adjacent to each other in pairs on the same horizontal plane inside the shell. One end of the muffler pipe is arranged at the bottom of the muffler cavity, and the other end extends toward the top of the muffler cavity.

3. The muffler device according to claim 2, characterized in that: At least two of the muffler cavities are arranged at intervals along a first direction on the inner side of the shell, and at least two of the muffler cavities are arranged at intervals along a second direction on the inner side of the shell, wherein the first direction is perpendicular to the second direction.

4. The muffler device according to any one of claims 1 to 3, characterized in that: The muffler pipe is a spiral pipe, and the muffler pipe spirally extends toward the top of the muffler cavity.

5. The muffler according to any one of claims 1 to 3, characterized in that: The silencer assembly also includes an adjustment assembly, and the silencer pipe includes a first pipe section and a second pipe section. The adjustment assembly is arranged at the bottom of the silencer cavity, and the first pipe section is arranged on the adjustment assembly. One end of the second pipe section is telescopically connected to the first pipe section, and the other end extends toward the top of the silencer cavity, wherein the adjustment assembly is used to drive the second pipe section to telescopically move along the axial direction of the first pipe section to lengthen or shorten the silencer pipe.

6. The muffler device according to claim 5, characterized in that: The adjustment assembly includes a rotary drive member and a base shell, a through hole is provided on the top of the base shell, the first pipe segment is accommodated in the base shell, the end of the second pipe segment passes through the through hole and is threadedly sleeved with the first pipe segment, the rotary drive member is provided in the base shell and connected to the first pipe segment, wherein the rotary drive member is used to drive the first pipe segment to rotate so as to drive the second pipe segment to move relative to the first pipe segment along the axial direction of the first pipe segment.

7. The muffler device according to any one of claims 1 to 3, characterized in that: The muffler device further comprises a porous sound absorbing member, and the porous sound absorbing member is filled in the top of the muffler cavity.

8. An air conditioner outdoor unit, characterized in that: A noise reduction device comprising the noise reduction device according to any one of claims 1 to 7.

9. The air conditioner outdoor unit according to claim 8, characterized in that: The air conditioner outdoor unit also includes a casing and a compressor, wherein the compressor is arranged in the casing, the shell portion of the muffler is arranged in the casing, and the open portion of the muffler cavity of the muffler is adjacent to the compressor.

10. A noise reduction control method for an air conditioner outdoor unit, characterized in that: include: Detect the noise frequency of compressor pipeline vibration; The regulating component is controlled to adjust the length of the muffler pipe according to the noise frequency of the compressor pipeline vibration.

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