Silencing device and central air conditioner

Abstract

The invention relates to the technical field of heat pumps, and provides a silencing device and a central air conditioner. The silencing device is applied to the bypass pipe of the central air conditioning unit. The silencing device comprises a silencing device body and an adjusting unit. The silencing device body is provided with a resonant cavity, a refrigerant inlet and a refrigerant outlet, the refrigerant inlet can communicate with the refrigerant outlet through the resonant cavity, the refrigerant inlet is used for communicating with an outlet of the condenser through the bypass pipe, and the refrigerant outlet is used for communicating with an inlet of the evaporator; the adjusting unit is connected with the silencing device body and used for adjusting the volume of the resonant cavity so as to adjust the inherent frequency of the resonant cavity. In specific implementation, the volume of the resonant cavity can be adjusted by the adjusting unit so as to adjust the inherent frequency of the resonant cavity, so that the inherent frequency of the resonant cavity can be adjusted to be matched with sound waves by adjusting the volume of the resonant cavity, and noise elimination is realized. The technical problem that in the prior art, a silencing device can only conduct silencing on sound waves matched with the inherent frequency of a resonant cavity is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and particularly to a noise elimination device and a central air conditioner. Background Art

[0002] A central air conditioner includes a unit and terminals. The unit includes a condenser, an evaporator, a bypass pipe and a valve (ball valve). One end of the bypass pipe is connected to the outlet of the condenser, and the other end of the bypass pipe is connected to the inlet of the condenser. The bypass pipe is used to control the pressure of the refrigerant; the ball valve is arranged on the bypass pipe to control the flow rate of the pipeline. In specific applications, for example, when it is necessary to relieve pressure from the condenser to the evaporator, the valve can be opened. After the valve is opened, due to the different pressures of the refrigerant in the condenser and the refrigerant in the evaporator, usually the pressure of the refrigerant in the condenser is higher than the pressure of the refrigerant in the evaporator. Under the action of the pressure difference, the gaseous refrigerant will flow at a high speed in the bypass pipe. During the high-speed flow process, the gaseous refrigerant will generate noise. In order to reduce this noise, a noise elimination device is usually connected to the bypass pipeline.

[0003] The noise elimination device of the prior art has a resonance cavity and an inlet that can communicate with the resonance cavity. When sound waves enter the resonance cavity through the inlet, due to the frequency of the sound waves matching the natural frequency of the resonance cavity, resonance will occur. In the resonance state, the energy of the sound waves will be reflected back and forth in the resonance cavity, resulting in the attenuation of the sound energy in the resonance cavity. That is, the resonance cavity will absorb a large amount of sound energy, causing the energy of the sound waves to be attenuated, thereby achieving the effect of noise elimination.

[0004] However, since the volume of the resonance cavity is fixed, the noise elimination device of the prior art can only eliminate the sound waves that match the natural frequency of the resonance cavity. If the frequency of the sound waves does not match the natural frequency of the resonance cavity, the bypass pipeline will still generate noise, affecting the use experience. Summary of the Invention

[0005] The present invention provides a noise elimination device and a central air conditioner to solve the technical problem that the noise elimination device in the prior art can only eliminate the sound waves that match the natural frequency of the resonance cavity.

[0006] The present invention provides a noise elimination device applied to the bypass pipe of the unit of a central air conditioner. The noise elimination device includes: a noise elimination device main body having a resonance cavity, a refrigerant inlet and a refrigerant outlet. The refrigerant inlet can communicate with the refrigerant outlet through the resonance cavity. The refrigerant inlet is used to communicate with the outlet of the condenser through the bypass pipe, and the refrigerant outlet is used to communicate with the inlet of the evaporator; an adjustment unit connected to the noise elimination device main body for adjusting the volume of the resonance cavity to adjust the natural frequency of the resonance cavity.

[0007] According to an embodiment of the present invention, the adjusting unit includes: an adjusting member located in the resonance cavity and connected to the cavity wall of the resonance cavity; a driving member connected to the adjusting member for driving the adjusting member to move so as to adjust the volume of the resonance cavity through the adjusting member.

[0008] According to an embodiment of the present invention, the main body of the noise elimination device includes a sound insulation shell and a porous tube; the resonance cavity, the refrigerant inlet and the refrigerant outlet are arranged in the sound insulation shell, and the resonance cavity extends along the axial direction of the sound insulation shell; the sound insulation shell has a first end and a second end arranged along its axial direction; the refrigerant inlet is located at the first end; the refrigerant outlet is located on the side wall of the sound insulation shell; the adjusting member is an adjusting plate, and the periphery of the adjusting plate is slidably connected to the peripheral wall of the resonance cavity; the driving member is used to drive the adjusting member to slide along the axial direction of the sound insulation shell between the second end and the refrigerant outlet; the porous tube is arranged along the axial direction of the sound insulation shell and is arranged in the resonance cavity and located between the adjusting member and the second end, and the porous tube is coaxially arranged with the refrigerant inlet.

[0009] According to an embodiment of the present invention, the driving member includes an adjusting bolt, the adjusting bolt is arranged along the axial direction of the sound insulation shell and can penetrate through the second end and is screwed to the second end, and the end of the adjusting bolt is connected to the plate surface of the adjusting plate.

[0010] According to an embodiment of the present invention, the driving member includes an adjusting rod and a linear motion structure; the adjusting rod is arranged along the axial direction of the sound insulation shell and can penetrate through the second end and is slidably connected to the second end, and the end of the adjusting rod is connected to the plate surface of the adjusting plate; the linear motion structure is connected to the adjusting rod for making the adjusting rod move linearly.

[0011] According to an embodiment of the present invention, it further includes a sound sensor and a controller; the adjusting member divides the resonance cavity into a first cavity and a second cavity arranged in sequence from the first end to the second end; the sound sensor is located in the second cavity for detecting the intensity of the sound in the second cavity; the porous tube is located in the first cavity; the controller is electrically connected to the sound sensor and the linear motion structure for controlling the linear motion structure according to the intensity.

[0012] According to an embodiment of the present invention, the linear motion structure includes: a motor located outside the resonance cavity and connected to the sound insulation shell; a lead screw arranged along the axial direction of the sound insulation shell, and the end of the lead screw is connected to the output end of the motor; a nut sleeve sleeved on the lead screw and connected to the adjusting rod.

[0013] According to an embodiment of the present invention, it further includes a connecting plate, the periphery of the connecting plate is connected to the peripheral wall of the resonance cavity, the porous tube is arranged in the first cavity through the connecting plate, and the connecting plate has a plurality of through holes arranged at intervals.

[0014] According to an embodiment of the present invention, the adjusting plate has a plurality of through holes arranged at intervals.

[0015] The present invention also provides a central air conditioner, comprising: a unit, the unit including a condenser; the noise elimination device of the above embodiment, the refrigerant inlet of the noise elimination device being communicated with the outlet of the condenser.

[0016] The characteristics and advantages of the noise elimination device and the central air conditioner of the present invention are as follows:

[0017] The adjustment unit can adjust the volume of the resonance cavity to adjust the natural frequency of the resonance cavity. Therefore, the natural frequency of the resonance cavity can be adjusted to match the sound wave by adjusting the volume of the resonance cavity, so as to achieve noise elimination. Compared with the prior art, since the natural frequency of the resonance cavity of the noise elimination device of the present invention is flexible and adjustable, the present invention can eliminate sound waves of different frequencies, with a wider application range, and solves the technical problem that the noise elimination device in the prior art can only eliminate sound waves matching the natural frequency of the resonance cavity; in specific applications, if noise is heard in the bypass pipeline, it indicates that the current natural frequency of the resonance cavity does not match the frequency of the sound wave, and the current natural frequency of the resonance cavity can be adjusted through the adjustment unit to make the current natural frequency of the resonance cavity match the frequency of the sound wave of the noise, so as to eliminate the noise and avoid the situation where sudden noise (noise of special frequency) cannot be eliminated. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a partial structural schematic diagram of the central air conditioner of the present invention.

[0020] Figure 2 It is a structural schematic diagram of the noise elimination device of the present invention.

[0021] Reference Numerals:

[0022] 100, noise elimination device; 110, noise elimination device main body; 111, sound insulation shell; 1110, resonance cavity; 1111, first cavity; 1112, second cavity; 1120, refrigerant inlet; 1130, refrigerant outlet; 1101, first end; 1102, second end; 112, porous pipe; 120, adjustment unit; 121, adjustment component; 122, driving component; 130, connecting plate; 200, condenser; 300, evaporator; O, axis of the sound insulation shell. Detailed Embodiments

[0023] To make the objectives, technical solutions and advantages of the present invention more clear, the following will, in conjunction with the accompanying drawings in the present invention, clearly and completely describe the technical solutions in the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0024] In the description of this embodiment, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing this embodiment and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to this embodiment.

[0025] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this embodiment, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0026] In this embodiment, unless otherwise clearly specified and limited, the terms "arranged", "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0027] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0028] Figures 1 to 2 shows the muffling device 100 and the central air conditioner provided by the present invention. As can be seen from the figure, the muffling device 100 of the present invention is applied to the bypass pipe of the central air conditioner unit. The muffling device 100 includes a muffling device main body 110 and an adjustment unit 120. The muffling device main body 110 has a resonance cavity 1110, a refrigerant inlet 1120 and a refrigerant outlet 1130. The refrigerant inlet 1120 can communicate with the refrigerant outlet 1130 through the resonance cavity 1110. The refrigerant inlet 1120 is used to communicate with the outlet of the condenser 200 through the bypass pipe, and the refrigerant outlet 1130 is used to communicate with the inlet of the evaporator 300; the adjustment unit 120 is connected to the muffling device main body 110 and is used to adjust the volume of the resonance cavity 1110 to adjust the natural frequency of the resonance cavity 1110.

[0029] During specific implementation, the adjustment unit 120 can adjust the volume of the resonance cavity 1110 to adjust the natural frequency of the resonance cavity 1110. Therefore, the natural frequency of the resonance cavity 1110 can be adjusted to match the sound wave by adjusting the volume of the resonance cavity 1110, thereby achieving noise reduction. Compared with the prior art, since the natural frequency of the resonance cavity 1110 of the muffling device 100 of the present invention is flexible and adjustable, the present invention can reduce the noise of sound waves with different frequencies, has a wider application range, and solves the technical problem that the muffling device 100 in the prior art can only reduce the noise of sound waves matching the natural frequency of the resonance cavity 1110; in specific applications, if noise is heard in the bypass pipeline, it indicates that the current natural frequency of the resonance cavity 1110 does not match the frequency of the sound wave. The adjustment unit 120 can be used to adjust the current natural frequency of the resonance cavity 1110 so that the current natural frequency of the resonance cavity 1110 can match the frequency of the sound wave of the noise to eliminate the noise and avoid the situation where sudden noise (noise with a special frequency) cannot be eliminated.

[0030] In this embodiment, the resonance cavity 1110 may be columnar and arranged horizontally; the refrigerant inlet 1120 may be located at the end of the resonance cavity 1110 and arranged coaxially with the resonance cavity 1110; the refrigerant outlet 1130 may be located at the bottom of the resonance cavity 1110.

[0031] According to an embodiment of the present invention, the adjusting unit 120 may include an adjusting member 121 and a driving member 122. The adjusting member 121 is located within the resonance cavity 1110 and is connected to the cavity wall of the resonance cavity 1110. The driving member 122 is connected to the adjusting member 121 and is configured to drive the adjusting member 121 to move, so as to adjust the volume of the resonance cavity 1110 through the adjusting member 121.

[0032] According to an embodiment of the present invention, the muffler device main body 110 includes a muffler housing 111 and a porous tube 112. The resonance cavity 1110, the refrigerant inlet 1120, and the refrigerant outlet 1130 are provided in the muffler housing 111. The resonance cavity 1110 extends along the axial direction O of the muffler housing 111. The muffler housing 111 has a first end 1101 and a second end 1102 arranged along its axial direction O. The refrigerant inlet 1120 is located at the first end 1101. The refrigerant outlet 1130 is located on the side wall of the muffler housing 111. The adjusting member 121 is an adjusting plate, and the periphery of the adjusting plate is slidably connected to the peripheral wall of the resonance cavity 1110. The driving member 122 is configured to drive the adjusting member 121 to slide between the second end 1102 and the refrigerant outlet 1130 along the axial direction O of the muffler housing 111. The porous tube 112 is arranged along the axial direction O of the muffler housing 111, is provided within the resonance cavity 1110, and is located between the adjusting member 121 and the second end 1102. The porous tube 112 is coaxially arranged with the refrigerant inlet 1120.

[0033] In a feasible embodiment, the driving member 122 includes an adjusting bolt. The adjusting bolt is arranged along the axial direction O of the muffler housing 111, can penetrate through the second end 1102, and is screwed to the second end 1102. The end of the adjusting bolt is connected to the plate surface of the adjusting plate.

[0034] During specific implementation, when it is necessary to adjust the natural frequency of the resonance cavity 1110, the adjusting bolt can be rotated. As the adjusting bolt rotates, the position of the adjusting plate will change, causing the adjusting plate to approach or move away from the first end 1101. That is to say, the volume of the resonance cavity 1110 can be increased or decreased. Since the change in the volume of the resonance cavity 1110 will affect the natural frequency of the resonance cavity 1110, the natural frequency of the resonance cavity 1110 can be adjusted by rotating the adjusting bolt.

[0035] In this embodiment, the adjusting bolt includes a connected head and a rod portion. The head is located outside the muffler device main body 110, and the rod portion is located inside the muffler device main body 110 and can penetrate through the second end 1102.

[0036] In another feasible embodiment, the driving member 122 may include an adjusting rod and a linear motion structure. The adjusting rod is arranged along the axial direction O of the muffler housing 111, can penetrate through the second end 1102, and is slidably connected to the second end 1102. The end of the adjusting rod is connected to the plate surface of the adjusting plate. The linear motion structure is connected to the adjusting rod and is configured to cause the adjusting rod to move linearly.

[0037] During specific implementation, the linear motion structure can drive the adjusting rod to perform linear motion. Along with the linear motion of the adjusting rod, the adjusting plate will also perform linear motion, causing the position of the adjusting plate to change, making the adjusting plate approach or move away from the first end 1101. That is to say, the volume of the resonance cavity 1110 can be increased or decreased. Since the change in the volume of the resonance cavity 1110 will affect the natural frequency of the resonance cavity 1110, therefore, through the above structural arrangement, the natural frequency of the resonance cavity 1110 can be adjusted.

[0038] In this embodiment, the adjusting rod can slide through the second end 1102, and the linear motion structure can be located outside the main body 110 of the sound absorption device.

[0039] According to an embodiment of the present invention, the sound absorption device 100 of the present invention may further include a sound sensor and a controller; the adjusting member 121 divides the resonance cavity 1110 into a first cavity 1111 and a second cavity 1112 arranged in sequence from the first end 1101 to the second end 1102; the sound sensor is located in the second cavity 1112 and is used to detect the intensity of the sound in the second cavity 1112; the porous tube 112 is located in the first cavity 1111; the controller is electrically connected to the sound sensor and the linear motion structure and is used to control the linear motion structure according to the intensity.

[0040] During specific implementation, if the sound sensor detects that the intensity of the sound in the second cavity 1112 is greater than a preset value, it indicates that there is noise in the bypass pipeline. That is to say, the natural frequency of the current resonance cavity 1110 does not match the frequency of the sound wave. At this time, the controller can control the linear motion structure. The linear motion structure can drive the adjusting rod to perform linear motion. Along with the linear motion of the adjusting rod, the adjusting plate will also perform linear motion, causing the position of the adjusting plate to change, making the adjusting plate approach or move away from the first end 1101. That is to say, the volume of the resonance cavity 1110 can be increased or decreased. Since the change in the volume of the resonance cavity 1110 will affect the natural frequency of the resonance cavity 1110, therefore, through the above structural arrangement, the natural frequency of the resonance cavity 1110 can be adjusted until when the sound sensor detects that the intensity of the sound in the second cavity 1112 is lower than the preset value, it indicates that there is no noise or less noise in the bypass pipeline, and there is no need to continue adjusting the natural frequency of the resonance cavity 1110. At this time, the controller can stop controlling the linear motion structure, so that the adjusting plate stops moving.

[0041] In this embodiment, the linear motion structure may include a motor, a lead screw, and a nut. The motor is located outside the resonance cavity 1110 and is connected to the sound absorption shell 111; the lead screw is arranged along the axial direction O of the sound absorption shell 111, and the end of the lead screw is connected to the output end of the motor; the nut is sleeved on the lead screw and is connected to the adjusting rod.

[0042] During specific implementation, if the sound sensor detects that the sound intensity in the second chamber 1112 is greater than the preset value, it indicates that there is noise in the bypass pipeline. That is, the natural frequency of the current resonance chamber 1110 does not match the frequency of the sound wave. At this time, the controller can control the motor to start. After the motor starts, the output shaft of the motor will rotate. The rotation of the output shaft of the motor can drive the screw rod to rotate. The rotation of the screw rod will cause the nut to move linearly along the axial direction O of the screw rod. When the nut moves linearly, it will drive the adjusting rod to move linearly. As the adjusting rod moves linearly, the adjusting plate will also move linearly, changing the position of the adjusting plate, making the adjusting plate approach or move away from the first end 1101. That is, the volume of the resonance chamber 1110 can be increased or decreased. Since the change in the volume of the resonance chamber 1110 will affect the natural frequency of the resonance chamber 1110, through the above structural settings, the natural frequency of the resonance chamber 1110 can be adjusted until the sound sensor does not detect that the sound intensity in the second chamber 1112 is lower than the preset value, indicating that there is no noise or less noise in the bypass pipeline and there is no need to continue adjusting the natural frequency of the resonance chamber 1110. At this time, the controller can stop controlling the linear motion structure, so that the adjusting plate stops moving.

[0043] According to an embodiment of the present invention, the sound-absorbing device 100 of the present invention may further include a connecting plate 130. The periphery of the connecting plate 130 is connected to the peripheral wall of the resonance chamber 1110. The porous pipe 112 is arranged in the first chamber 1111 through the connecting plate 130. The connecting plate 130 has a plurality of through holes arranged at intervals.

[0044] During specific implementation, the connecting plate 130 can connect the porous pipe 112 to the chamber wall (sound-absorbing shell 111) of the resonance chamber 1110. The through holes have two main functions: First, the pores (through holes) can change the flow mode and speed of the air flow in the resonance chamber 1110. By reasonably designing and arranging the pores, the air flow can be guided to form a complex flow path in the resonance chamber 1110, thereby enhancing the energy loss and attenuation of the sound wave and improving the sound-absorbing performance. Second, the existence of the pores can increase the contact area between the sound wave and the air. When the sound wave enters the resonance chamber 1110 through the pores, it will cause friction and turbulent motion with the air around the pores, thereby increasing the energy loss and attenuation of the sound wave.

[0045] According to an embodiment of the present invention, the adjusting plate has a plurality of through holes arranged at intervals.

[0046] During specific implementation, the functions of the through holes of the adjusting plate can refer to the functions of the through holes of the above-mentioned connecting plate 130.

[0047] The present invention also provides a central air conditioner, which includes a unit and a noise elimination device 100. The unit includes a condenser 200; the refrigerant inlet 1120 of the noise elimination device 100 is communicated with the outlet of the condenser 200. The specific structure, working principle and beneficial effects of the noise elimination device 100 are the same as those of the above embodiments, and will not be elaborated here.

[0048] In some embodiments, the noise elimination device main body 110 may further include an air inlet pipe, which is axially penetrated through the refrigerant inlet 1120 along the axis O of the sound insulation shell 111. The air inlet pipe includes a first section and a second section connected to each other. The first section is located outside the resonance cavity 1110, and the second section is located inside the resonance cavity 1110. A plurality of through holes arranged at intervals are provided on the outer peripheral wall of the second section.

[0049] During specific implementation, the function of the through holes in the second section can refer to the function of the through holes in the above-mentioned connecting plate 130.

[0050] In this embodiment, the through holes may also be referred to as micro holes, and the aperture of the through holes may be 2 millimeters.

[0051] In summary, the noise elimination device 100 of the present invention can effectively reduce the noise of the unit. At the same time, because it is adjustable, it can be adapted to more unit models and more working conditions, increasing the economy, better improving the overall quality of the machine, and improving the user experience.

[0052] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" means that the specific features, structures, materials or characteristics described in connection with the embodiment or mode are included in at least one embodiment or mode of the embodiments of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or modes in a suitable manner. In addition, without conflict, those skilled in the art can combine and combine the different embodiments or modes described in this specification and the features of different embodiments or modes.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A muffler, characterized in that: The bypass pipe of the central air-conditioning unit is applied, and the muffler device comprises: The muffler body (110) comprises a resonance cavity (1110), a refrigerant inlet (1120) and a refrigerant outlet (1130); the refrigerant inlet (1120) can be connected to the refrigerant outlet (1130) through the resonance cavity (1110); the refrigerant inlet (1120) is used to be connected to the outlet of the condenser (200) through the bypass pipe; the refrigerant outlet (1130) is used to be connected to the inlet of the evaporator (300); An adjustment unit (120) is connected to the muffler device body (110) and is used to adjust the volume of the resonance cavity (1110) so as to adjust the natural frequency of the resonance cavity (1110).

2. The muffler device according to claim 1, characterized in that: The adjustment unit (120) comprises: An adjustment component (121) is located in the resonance cavity (1110) and connected to a cavity wall of the resonance cavity (1110); A driving component (122) is connected to the adjusting component (121) and is used to drive the adjusting component (121) to move, so as to adjust the volume of the resonance cavity (1110) through the adjusting component (121).

3. The muffler device according to claim 2, characterized in that: The muffler device body (110) comprises a muffler shell (111) and a porous tube (112); The resonance cavity (1110), the refrigerant inlet (1120) and the refrigerant outlet (1130) are arranged in the muffler shell (111), and the resonance cavity (1110) is extended along the axial direction (O) of the muffler shell (111); The muffler shell (111) has a first end (1101) and a second end (1102) arranged along its axial direction (O); The refrigerant inlet (1120) is located at the first end (1101); the refrigerant outlet (1130) is located on the side wall of the silencer shell (111); The adjusting component (121) is an adjusting plate, and the periphery of the adjusting plate can be slidably connected to the peripheral wall of the resonance cavity (1110); The driving component (122) is used to drive the adjusting component (121) to slide between the second end (1102) and the refrigerant outlet (1130) along the axial direction (O) of the silencer shell (111); The porous tube (112) is arranged along the axial direction (O) of the silencer shell (111), and is arranged in the resonance cavity (1110), and is located between the adjustment component (121) and the second end (1102). The porous tube (112) is coaxially arranged with the refrigerant inlet (1120).

4. The muffler device according to claim 3, characterized in that: The driving component (122) comprises an adjusting bolt, which is arranged along the axial direction (O) of the silencer shell (111) and can pass through the second end (1102) and is screwed to the second end (1102), and the end of the adjusting bolt is connected to the plate surface of the adjusting plate.

5. The muffler device according to claim 3, characterized in that: The driving component (122) comprises an adjusting rod and a linear motion structure; The adjusting rod is arranged along the axial direction (O) of the muffler shell (111), and can penetrate the second end (1102), and can be slidably connected to the second end (1102), and the end of the adjusting rod is connected to the plate surface of the adjusting plate; The linear motion structure is connected to the adjusting rod and is used to make the adjusting rod move linearly.

6. The muffler device according to claim 5, characterized in that: Also included are sound sensors and controllers; The adjusting component (121) divides the resonance cavity (1110) into a first cavity (1111) and a second cavity (1112) which are sequentially arranged from the first end (1101) to the second end (1102); The sound sensor is located in the second cavity (1112) and is used to detect the intensity of the sound in the second cavity (1112); The porous tube (112) is located in the first cavity (1111); The controller is electrically connected to the sound sensor and the linear motion structure, and is used to control the linear motion structure according to the intensity.

7. The muffler device according to claim 6, characterized in that: The linear motion structure comprises: A motor, located outside the resonance cavity (1110) and connected to the muffler housing (111); A screw rod is arranged along the axial direction (O) of the muffler housing (111), and an end of the screw rod is connected to an output end of the motor; The nut is sleeved on the screw rod and connected to the adjusting rod.

8. The muffler device according to claim 6, characterized in that: It also includes a connecting plate (130), the periphery of which is connected to the peripheral wall of the resonance cavity (1110), the porous tube (112) is arranged in the first cavity (1111) through the connecting plate (130), and the connecting plate (130) has a plurality of through holes arranged at intervals.

9. The muffler according to any one of claims 3 to 8, characterized in that: The adjustment plate has a plurality of through holes arranged at intervals.

10. A central air conditioner, characterized in that: include: A unit, the unit comprising a condenser (200); The silencer (100) according to any one of claims 1 to 9, wherein the refrigerant inlet (1120) of the silencer (100) is connected to the outlet of the condenser (200).

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