CN116357542A - Sound-deadening shell with adjustable resonant holes, compressor and sound-deadening method - Google Patents

Abstract

The invention provides a silencing shell with an adjustable opening quantity of resonance holes, a compressor and a silencing method, and relates to the technical field of compressor noise reduction. According to the invention, the first cavity is arranged to reduce the volume of the second cavity, and the second cavity modal frequency is improved by reducing the volume of the second cavity, so that resonance excitation of lower peak frequency of frequency multiplication harmonic waves of fundamental frequency near the second cavity modal frequency is avoided; a first cavity is arranged between the upper inner shell and the upper outer shell, and a plurality of resonance holes are formed in the upper inner shell, so that a Helmholtz resonance type silencing cavity is formed in the first cavity, and silencing is realized through the Helmholtz resonance type silencing cavity; the sealing plate acts for opening and Guan Gongzhen holes in sequence relative to the upper inner shell, the number of resonance holes in an opening state is changed, and the silencing frequency is changed by changing the number of resonance holes in the opening state, so that the real-time silencing frequency is matched with the cavity noise peak frequency generated by exciting the real-time frequency doubling harmonic wave peak value of the corresponding fundamental frequency of the real-time rotating speed of the compressor, and silencing and noise reduction are realized.

Description

Sound-deadening shell with adjustable resonant holes, compressor and sound-deadening method

Technical Field

The invention relates to the technical field of compressor noise reduction, in particular to a silencing shell with an adjustable opening quantity of resonance holes, a compressor and a silencing method.

Background

Compressor noise is mainly from housing internal noise and housing vibration radiated noise.

The noise inside the shell comprises valve plate slapping noise, refrigerant high-speed flowing eruption noise, structural part friction noise, electromagnetic noise, structural part vibration noise and the like, wherein the ratio of the suction and exhaust valve plate slapping noise to the refrigerant high-speed flowing eruption noise in the cylinder and the cylinder head part is highest.

Because the compressor is in indirect suction, the suction silencer air inlet is not directly connected with the shell, the suction silencer air inlet is connected with the inner cavity of the shell, valve plate slapping noise, refrigerant high-speed flow eruption noise and suction pressure pulsation are transmitted to the inner cavity of the shell through the suction silencer, and the suction silencer can reduce part of noise and pulsation, but still can excite the response of the inner cavity of the shell. The cavity inside the shell belongs to a closed structure, acoustic modes exist, the acoustic modes change along with the change of the volume and the size of the cavity, the main contribution is a front third-order mode, the front third-order mode is located in the range of 630-1000Hz, and the smaller the volume is, the higher the frequency is. Resonance occurs under the excitation of noise and pulsation, and the noise is amplified to generate cavity resonance noise.

Both the noise and the pulsation excitation of the reciprocating piston compressor are the frequency multiplication of the rotation fundamental frequency, so that the frequency multiplication harmonic wave of the fundamental frequency necessarily covers the whole frequency band in the full rotation speed range of the compressor. Excitation peaks necessarily exist near the modal frequencies of the shell cavity, so that resonance is excited, cavity resonance noise is an inherent property of compressor noise and cannot be eliminated, and noise excitation can only be reduced by optimizing a silencer at present.

The shell vibration radiation noise comes from the fact that the shell is excited by the vibration of the movement to generate vibration response outward radiation noise, and the shell internal noise excites the shell sound vibration coupling to generate vibration outward radiation noise.

Disclosure of Invention

The invention aims to provide a silencing shell with an adjustable number of resonant holes, a compressor and a silencing method, wherein cavity resonance noise is reduced by reducing the volume of a cavity, and the number of the resonant holes in an open state is changed to realize self-adaptive regulation silencing in a full rotating speed range.

In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

a silencing shell with an adjustable resonance hole opening number comprises an upper outer shell, an upper inner shell, a lower shell, a sealing plate and a driving device;

the upper inner shell is positioned in the upper outer shell, the edge of the upper inner shell is connected with the edge of the upper outer shell, and a first cavity is reserved between the upper inner shell and the upper outer shell;

the edge of the upper outer shell and/or the edge of the upper inner shell is matched with the edge of the lower shell, and a second cavity is reserved between the upper inner shell and the lower shell;

the upper inner shell is provided with at least two resonance holes, and the resonance holes are communicated with the first cavity and the second cavity;

the sealing plate is movably connected with the upper inner shell, and can act relative to the upper inner shell to sequentially open and close the resonance holes, so that the number of the resonance holes in an open state is changed;

the driving device acts to drive the sealing plate to act relative to the upper inner shell.

Preferably, a guide rod is arranged on the sealing plate, a guide seat is arranged on the upper inner shell, the guide rod is connected with the guide seat in a sliding manner, and the guide rod can move relative to the guide seat;

the guide rod moves relative to the guide seat so as to drive the sealing plate to move relative to the upper inner shell;

each of the resonance holes is arranged on the upper inner case along a moving direction of the sealing plate.

Preferably, the driving device comprises a rack, a motor and a driving gear, wherein the rack is arranged on one side of the sealing plate or the guide rod, the motor is assembled on the upper inner shell, the driving gear is arranged at the rotating end of the motor, and the driving gear is meshed with the rack; the rotating end of the motor rotates forward or backward by a set angle so as to drive the sealing plate to move by a set distance relative to the upper inner shell.

Preferably, each of the resonance holes is arranged in a row along a moving direction of the sealing plate.

Preferably, the number of the resonance holes is six, one resonance hole is arranged in the first row, two resonance holes are arranged in the second row, and three resonance holes are arranged in the third row.

Preferably, the upper inner shell forms a plurality of protruding parts and recessed parts towards one side of the second cavity.

Preferably, the outer contours of the convex part and the concave part are in a step shape.

Preferably, the edge of the upper inner shell is matched with the edge of the upper outer shell, an annular notch is formed in the edge of the lower shell, and the edge of the upper outer shell is matched in the annular notch.

The compressor comprises a core assembly, a frequency converter and a controller, wherein the compressor is provided with a silencing shell with the adjustable resonant holes, the core assembly is positioned in the second cavity, the controller is connected with the frequency converter and the driving device through signal cables respectively, and the controller controls the driving device to act according to the output frequency of the frequency converter.

A compressor silencing method is applied to the compressor,

the controller stores the cavity noise peak frequency generated by exciting the frequency multiplication harmonic peak value corresponding to the fundamental frequency of the rotating speed of the compressor, the quantitative relation between the rotating speed of the compressor and the output frequency of the frequency converter and the silencing frequency corresponding to the number of the resonant holes in the open state;

the method comprises the following steps:

the compressor operates, the controller reads the real-time output frequency of the frequency converter to obtain the real-time rotating speed of the compressor, and then the cavity noise peak frequency generated by exciting the frequency multiplication harmonic peak value of the real-time rotating speed of the compressor corresponding to the fundamental frequency is obtained;

the controller controls the driving device to act so as to drive the sealing plate to act relative to the upper inner shell, so that the resonance holes are sequentially opened and closed, the number of the resonance holes in an opened state is changed, and the real-time silencing frequency is matched with the cavity noise peak frequency generated by excitation of the frequency multiplication harmonic peak value of the fundamental frequency corresponding to the real-time rotating speed of the compressor.

The beneficial technical effects of the invention are as follows:

according to the silencing shell, the compressor and the silencing method, the first cavity is arranged to reduce the volume of the second cavity, and the second cavity modal frequency is improved by reducing the volume of the second cavity, so that resonance is prevented from being excited near the second cavity modal frequency by the lower peak frequency of the frequency doubling harmonic wave of the fundamental frequency; a first cavity is arranged between the upper inner shell and the upper outer shell, and a plurality of resonance holes are formed in the upper inner shell, so that a Helmholtz resonance type silencing cavity is formed in the first cavity, and silencing is realized through the Helmholtz resonance type silencing cavity; the sealing plate acts relative to the upper inner shell to sequentially open and Guan Gongzhen holes, the number of resonance holes in an open state is changed, and the silencing frequency is changed by changing the number of resonance holes in the open state, so that the real-time silencing frequency is matched with the 'frequency multiplication harmonic peak frequency of the fundamental frequency corresponding to the real-time rotating speed of the compressor', and silencing and noise reduction are realized; in addition, the upper inner shell forms a plurality of protruding parts and recessed parts towards one side of the second cavity so as to realize refraction noise elimination; besides the refraction silencing, the sound is further insulated through the upper inner shell, and then is insulated through the upper outer shell. Therefore, the compressor achieves good noise reduction effect by reducing cavity resonance noise, resonance noise elimination (noise elimination frequency can be adjusted and changed), refraction noise elimination, upper inner shell noise insulation and upper outer shell noise insulation.

Drawings

FIG. 1 is a cross-sectional view of a compressor according to an embodiment of the present invention;

FIG. 2 is a second cross-sectional view of a compressor according to an embodiment of the present invention;

FIG. 3 is an exploded view of the upper outer shell, the upper inner shell, the sealing plate and the driving device according to the embodiment of the present invention;

FIG. 4 is an exploded view of a seal plate and a driving device according to an embodiment of the present invention;

FIG. 5 is a cross-sectional view of the upper outer shell, upper inner shell, seal plate and drive mechanism of an embodiment of the present invention;

FIG. 6 is a bottom view of the upper outer shell, the upper inner shell, the sealing plate and the driving device according to the embodiment of the present invention;

FIG. 7 is a perspective view of the inner housing according to an embodiment of the present invention;

FIG. 8 is a second perspective view of the inner housing according to the embodiment of the present invention;

fig. 9 is a bottom view of the upper inner shell of the embodiment of the present invention.

Detailed Description

The present invention will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantageous effects of the present invention more apparent. Some embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments are shown. Indeed, various embodiments of the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "inner", "outer", "upper", "lower", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In an embodiment of the present invention, a muffler shell with an adjustable number of resonant holes is provided, a compressor and a muffler method, please refer to fig. 1 to 9.

A silencing shell with an adjustable resonance hole opening number comprises an upper outer shell 11, an upper inner shell 12, a lower shell 2, a sealing plate 3 and a driving device 4.

The upper inner shell 12 is located inside the upper outer shell 11, the edge of the upper inner shell 12 is connected with the edge of the upper outer shell 11, and a first cavity 51 is reserved between the upper inner shell 12 and the upper outer shell 11. Wherein, the upper outer shell 11 and the upper inner shell 12 are formed by stamping steel plates by adopting a stamping process. The thickness of the upper outer case 11 is large, the thickness of the upper inner case 12 is small, and the total thickness of the upper outer case 11 and the upper inner case 12 is the same as the thickness of the lower case 2. The external shape and the size of the upper shell 11 and the lower shell 2 are unchanged, the overall height and the size of the compressor are not affected, the compatibility with the design of terminal products (such as a refrigerator and the like) is realized, and the cost is reduced.

The edge of the upper inner case 12 is interference fit with the edge of the upper outer case 11 to achieve tight connection between the edge of the upper inner case 12 and the edge of the upper outer case 11. The edge of the upper inner shell 12 is laminated on the inner wall of the upper outer shell 11, the outer wall of the edge of the upper outer shell 11 is matched with the edge of the lower shell 2, and a second cavity 52 is reserved between the upper inner shell 12 and the lower shell 2. Specifically, the edge position of the lower case 2 is provided with an annular notch 21, the edge of the upper case 11 is fitted in the annular notch 21, and the upper case 11 and the lower case 2 are assembled and fixed. In this way, the edge of the upper inner shell 12 is limited and squeezed between the edge of the upper outer shell 11 through the annular notch 21 of the lower shell 2, so that the edge of the upper inner shell 12 is firmly matched with the edge of the upper outer shell 11.

By arranging the first cavity 51 to reduce the volume of the second cavity 52, the cavity mode frequency of the second cavity 52 is improved, and resonance is avoided from being excited near the cavity mode frequency of the second cavity 52 by the lower peak frequency of the frequency multiplication harmonic of the fundamental frequency, so that cavity resonance noise is reduced.

The rotation speed of the compressor is usually 1200-4500rpm, the corresponding fundamental frequency is 20-75Hz, for example, when the compressor runs at 3000rpm, the fundamental frequency is 50Hz, integer multiple peaks of 50Hz exist in the full frequency band, such as peaks of 100HJz, 150Hz, 200Hz, 250Hz and the like, the frequency of the multiple harmonic peak of the fundamental frequency is increased, and the corresponding excitation energy is attenuated. Therefore, the higher peak frequency of the frequency multiplication harmonic wave of the fundamental frequency excites resonance near the cavity mode frequency, the resonance energy is lower, and the cavity resonance noise is reduced.

The upper inner shell 12 is provided with at least two resonance holes 121, and the resonance holes 121 are communicated with the first cavity 51 and the second cavity 52. The resonance hole 121 which is communicated with the first cavity 51 and the second cavity 52 is formed on the upper inner shell 12, so that the first cavity 51 forms a Helmholtz resonance type silencing cavity, and silencing is realized through the Helmholtz resonance type silencing cavity, so that noise with specific frequency is eliminated.

The sealing plate 3 is movably connected with the upper inner shell 12, and the sealing plate 3 can act relative to the upper inner shell 12 to sequentially open and close the six resonance holes 121, so as to change the number of the resonance holes 121 in an open state.

The driving device 4 acts to drive the sealing plate 3 to act relative to the upper inner shell 12.

The outer wall of the sealing plate 3 is provided with a guide rod 61, the upper inner shell 12 is provided with a guide seat 62, the guide seat 62 is provided with a limiting opening 621, the guide rod 61 is slidably connected in the limiting opening 621 of the guide seat 62, and the guide rod 61 can move relative to the guide seat 62. Wherein, both ends of the guide seat 62 are assembled and connected to the first screw hole 124 on the upper inner shell 12 through the screw 8.

The guide rod 61 moves relative to the guide seat 62 to drive the sealing plate 3 to move relative to the upper inner case 12, and the respective resonance holes 121 are arranged on the upper inner case 12 along the moving direction of the sealing plate 3.

In the present embodiment, the respective resonance holes 121 are arranged in a row along the moving direction of the sealing plate 3. The diameters of the resonance holes 121 may be the same or different, and the pitches between adjacent resonance holes 121 may be the same or different. The number of the resonance holes 121 is six, the diameters of the six resonance holes 121 are the same, one resonance hole 121 is arranged in the first row, two resonance holes 121 are arranged in the second row, and three resonance holes 121 are arranged in the third row. In this way, during the process of moving the sealing plate 3 from the first row to the third row of the resonance holes 121, the number of the opened resonance holes 121 is rapidly increased, and the corresponding noise elimination frequency is rapidly increased; conversely, during the movement of the sealing plate 3 from the third row to the first row of resonant holes 121, the number of closed resonant holes 121 decreases rapidly, and the corresponding noise elimination frequency decreases rapidly.

The driving device 4 comprises a rack 41, a motor 42 and a driving gear 43, wherein the rack 41 is arranged on one side of the sealing plate 3, the motor 42 is assembled on the upper inner shell 12, the driving gear 43 is arranged at the rotating end of the motor 42, and the driving gear 43 is meshed with the rack 41. Wherein, motor 42 sets up on motor cabinet 421, and motor cabinet 421 passes through screw 8 assembly connection on the second screw 125 on the upper inner shell 12. The rotating end of the motor 42 rotates forward or backward by a set angle, the driving gear 43 drives the rack 41 to move by a set distance so as to drive the sealing plate 3 to move by the set distance relative to the upper inner shell 12, and six resonance holes 121 are sequentially opened and closed in the process of moving the sealing plate 3 relative to the upper inner shell 12, so that the number of the resonance holes 121 in an opened state is changed, and the area of the resonance holes 121 in the opened state is changed.

By "changing the number of the resonance holes 121 in the on state", the area of the resonance holes 121 in the on state "is changed to change the muffling frequency. Specifically, the number of the opened resonance holes 121 increases, and the area of the resonance holes 121 in the opened state becomes large, so that the corresponding noise elimination frequency increases; the number of the resonance holes 121 to be opened is reduced, and the area of the resonance holes 121 in the opened state is reduced, so that the corresponding noise elimination frequency is reduced. So that the real-time noise elimination frequency is matched with the cavity noise peak frequency generated by exciting the real-time rotating speed of the compressor corresponding to the frequency multiplication harmonic peak value of the fundamental frequency, and noise elimination and reduction are realized.

The appearance of the existing compressor shell is generally close to a sphere, the outline of a cavity in the shell is also close to the sphere, various noise generated by a compressor core assembly and the like is transmitted outwards to reach the inner surface of the shell, and sound waves transmitted in all directions are vertically incident on the shell due to the fact that the inner surface is close to the sphere, no effective refraction silencing effect exists, and noise reduction can be carried out only by means of the sound insulation effect of the shell.

In the muffler shell with adjustable cavity volume of this embodiment, the upper inner shell 12 forms a plurality of protruding portions 122 and recessed portions 123 toward the second cavity 52 side, and more specifically, the outer contours of the protruding portions 122 and the recessed portions 123 are stepped. The convex parts 122 and the concave parts 123 are combined to form a plurality of wedge-like structures with angles, when sound waves are incident on the surfaces of the upper inner shell 12 and the lower shell 2, refraction and reflection occur on the surfaces of the upper inner shell 12 and the lower shell 2, and the wedge-like structures with angles can refract noise for a plurality of times and attenuate the noise gradually, so that refraction and noise elimination are realized, and the noise is reduced.

The compressor comprises a core assembly 7, a frequency converter and a controller, wherein the compressor is provided with the silencing shell with the adjustable resonant holes in the embodiment, the core assembly 7 is positioned in the second cavity 52, the controller is connected with the frequency converter and the driving device 4 through signal cables respectively, and the controller controls the driving device 4 to act according to the output frequency of the frequency converter.

A compressor silencing method is applied to the compressor, and a controller stores 'cavity noise peak frequency generated by frequency multiplication harmonic peak excitation of the rotation speed of the compressor corresponding to fundamental frequency', 'quantitative relation between the rotation speed of the compressor and the output frequency of a frequency converter', and 'quantity of resonance holes in an open state corresponding to silencing frequency';

the method comprises the following steps:

the shell structure shape and the core structure layout of the compressor determine the cavity structure and the volume in the shell, and under the condition that the cavity structure and the volume are certain, the acoustic mode frequency can be determined, and the cavity mode frequency can be accurately obtained through a mode simulation and test combination method.

After the compressor frequency converter receives the signal of the main control board of the refrigerator, the compressor is controlled to run according to the appointed rotating speed, the controller reads the real-time output frequency of the frequency converter to obtain the real-time rotating speed of the compressor, and then the cavity noise peak frequency generated by exciting the frequency multiplication harmonic peak value of the real-time rotating speed of the compressor corresponding to the fundamental frequency is obtained;

the highest peak frequency of the cavity noise under different rotating speeds can be obtained through the obtained cavity modal frequency of the compressor and the frequency multiplication harmonic peak frequency corresponding to the fundamental frequency in real time of the compressor, namely the excitation frequency, and the cavity modal frequency is an inherent attribute, the frequency is unchanged, the excitation frequency corresponding to the rotating speed of the compressor is changed, resonance amplification noise is generated when the excitation frequency is close to the cavity modal frequency, resonance is more obvious when the excitation frequency is close to the cavity modal frequency, and therefore the frequency with the most obvious resonance under each rotating speed, namely the cavity noise peak frequency, can be calculated.

The silencing peak frequency of the Helmholtz resonance type silencer is mainly influenced by the volume of a resonant cavity, the length, the diameter and the number of resonant holes, the volume of the resonant cavity, the length of the resonant holes and the diameter are unchanged, the silencing frequency is adjusted by changing the number of the resonant holes, the number of the opened resonant holes 121 is increased, the area of the resonant holes 121 in an opened state is enlarged, and the corresponding silencing frequency is increased; the number of the resonance holes 121 to be opened is reduced, and the area of the resonance holes 121 in the opened state is reduced, so that the corresponding noise elimination frequency is reduced. Through simulation calculation and experimental tests, the silencing frequencies corresponding to the number and the areas of different resonant holes 121 are determined in advance, and the optimal number and the area of the resonant holes at each rotating speed can be obtained by combining the cavity noise peak frequency at the rotating speed.

The parameters are embedded into the controller, and when the compressor works normally, the controller reads the real-time output frequency of the frequency converter to obtain the real-time rotating speed of the compressor, so as to obtain the peak frequency of the cavity noise, and further obtain the optimal quantity and area of the resonant holes.

The controller controls the driving device 4 to act so as to drive the sealing plate 3 to act relative to the upper inner shell 12, so that the resonance holes 121 are sequentially opened and closed, the number of the resonance holes 121 in the opened state is changed, the optimal number and area of the resonance holes are achieved, and the real-time silencing frequency is matched with the cavity noise peak frequency generated by excitation of the real-time rotating speed of the compressor corresponding to the frequency doubling harmonic wave peak value of the fundamental frequency. Thereby realizing self-adaptive noise elimination in the full rotating speed range and reducing cavity noise.

The present embodiment has been described in detail with reference to the accompanying drawings. From the above description, those skilled in the art should clearly recognize that the resonance hole opening amount of the present invention is adjustable, the muffler shell, the compressor, and the muffler method. According to the silencing shell, the compressor and the silencing method with the adjustable opening quantity of the resonant holes, the first cavity 51 is arranged to reduce the volume of the second cavity 52, and the second cavity 52 cavity modal frequency is improved by reducing the volume of the second cavity 52, so that resonance is prevented from being excited near the second cavity 52 cavity modal frequency by the lower peak frequency of the frequency multiplication harmonic wave of the fundamental frequency; a first cavity 51 is arranged between the upper inner shell 12 and the upper outer shell 11, and a plurality of resonance holes 121 are formed in the upper inner shell 12, so that the first cavity 51 forms a Helmholtz resonance type silencing cavity, and silencing is realized through the Helmholtz resonance type silencing cavity; the sealing plate 3 acts relative to the upper inner shell 12 to sequentially open and close the resonance holes 121, the number of the resonance holes 121 in an open state is changed, and the silencing frequency is changed by changing the number of the resonance holes 121 in the open state, so that the real-time silencing frequency is matched with the 'frequency multiplication harmonic peak frequency of the fundamental frequency corresponding to the real-time rotating speed of the compressor', and silencing and noise reduction are realized; in addition, the upper inner case 12 forms a plurality of protrusions 122 and depressions 123 toward the second cavity 52 side to achieve refraction noise elimination; besides silencing by refraction, sound is further insulated by the upper inner shell 12 and then is insulated by the upper outer shell 11. Therefore, the compressor achieves good noise reduction effect by reducing cavity resonance noise, resonance noise elimination (noise elimination frequency can be adjusted and changed), refraction noise elimination, upper inner shell 12 noise insulation and upper outer shell 11 noise insulation.

While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.

Claims (10)

1. The utility model provides a resonance hole opens quantity adjustable noise elimination casing which characterized in that:

comprises an upper outer shell, an upper inner shell, a lower shell, a sealing plate and a driving device;

the upper inner shell is positioned in the upper outer shell, the edge of the upper inner shell is connected with the edge of the upper outer shell, and a first cavity is reserved between the upper inner shell and the upper outer shell;

the edge of the upper outer shell and/or the edge of the upper inner shell is matched with the edge of the lower shell, and a second cavity is reserved between the upper inner shell and the lower shell;

the upper inner shell is provided with at least two resonance holes, and the resonance holes are communicated with the first cavity and the second cavity;

the sealing plate is movably connected with the upper inner shell, and can act relative to the upper inner shell to sequentially open and close the resonance holes, so that the number of the resonance holes in an open state is changed;

the driving device acts to drive the sealing plate to act relative to the upper inner shell.

2. The muffler shell with an adjustable number of resonant holes as claimed in claim 1, wherein:

the sealing plate is provided with a guide rod, the upper inner shell is provided with a guide seat, the guide rod is connected with the guide seat in a sliding manner, and the guide rod can move relative to the guide seat;

the guide rod moves relative to the guide seat so as to drive the sealing plate to move relative to the upper inner shell;

each of the resonance holes is arranged on the upper inner case along a moving direction of the sealing plate.

3. The muffler shell with an adjustable number of resonant holes as claimed in claim 2, wherein:

the driving device comprises a rack, a motor and a driving gear, wherein the rack is arranged on one side of the sealing plate or one side of the guide rod, the motor is assembled on the upper inner shell, the driving gear is arranged at the rotating end of the motor, and the driving gear is meshed with the rack; the rotating end of the motor rotates forward or backward by a set angle so as to drive the sealing plate to move by a set distance relative to the upper inner shell.

4. The muffler shell with an adjustable number of resonant holes as claimed in claim 2, wherein:

each of the resonance holes is arranged in a row along a moving direction of the sealing plate.

5. The adjustable resonator hole opening number muffler shell of claim 4, wherein:

the number of the resonant holes is six, one resonant hole is arranged in the first row, two resonant holes are arranged in the second row, and three resonant holes are arranged in the third row.

6. The muffler shell with an adjustable number of resonant holes as claimed in claim 1, wherein:

the upper inner shell forms a plurality of protruding parts and recessed parts towards one side of the second cavity.

7. The adjustable resonator hole opening number muffler shell of claim 6, wherein:

the outer contours of the convex part and the concave part are in a step shape.

8. The muffler shell with an adjustable number of resonant holes as claimed in claim 1, wherein:

the edge of the upper inner shell is matched with the edge of the upper outer shell, an annular notch is formed in the edge of the lower shell, and the edge of the upper outer shell is matched in the annular notch.

9. The utility model provides a compressor, includes core subassembly, converter and controller, its characterized in that:

the compressor is provided with the silencing shell with the adjustable resonant holes according to any one of claims 1 to 8, the core assembly is positioned in the second cavity, the controller is connected with the frequency converter and the driving device through signal cables respectively, and the controller controls the driving device to act according to the output frequency of the frequency converter.

10. A method of silencing a compressor using the compressor of claim 9, wherein:

the controller stores the cavity noise peak frequency generated by exciting the frequency multiplication harmonic peak value corresponding to the fundamental frequency of the rotating speed of the compressor, the quantitative relation between the rotating speed of the compressor and the output frequency of the frequency converter and the silencing frequency corresponding to the number of the resonant holes in the open state;

the method comprises the following steps:

the compressor operates, the controller reads the real-time output frequency of the frequency converter to obtain the real-time rotating speed of the compressor, and then the cavity noise peak frequency generated by exciting the frequency multiplication harmonic peak value of the real-time rotating speed of the compressor corresponding to the fundamental frequency is obtained;

the controller controls the driving device to act so as to drive the sealing plate to act relative to the upper inner shell, so that the resonance holes are sequentially opened and closed, the number of the resonance holes in an opened state is changed, and the real-time silencing frequency is matched with the cavity noise peak frequency generated by excitation of the frequency multiplication harmonic peak value of the fundamental frequency corresponding to the real-time rotating speed of the compressor.

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