CN116357542A - A sound-absorbing shell with an adjustable opening number of resonance holes, a compressor, and a sound-absorbing method - Google Patents

Abstract

The invention provides a sound-absorbing housing with an adjustable opening number of resonance holes, a compressor and a sound-absorbing method, and relates to the technical field of compressor noise reduction. In the present invention, the volume of the second cavity is reduced by setting the first cavity, and the cavity modal frequency of the second cavity is increased by reducing the volume of the second cavity, so as to avoid lower harmonics of the fundamental frequency The peak frequency excites resonance near the cavity mode frequency of the second cavity; the first cavity is set between the upper inner shell and the upper outer shell, and a plurality of resonance holes are opened in the upper inner shell, so that the first cavity forms a Helmhorn The Helmholtz resonance type noise reduction chamber realizes the noise elimination through the Helmholtz resonance type noise reduction chamber; the sealing plate moves relative to the upper inner shell to open and close the resonance holes in sequence, changing the number of resonance holes in the open state, and changing the number of resonance holes in the open state The number of resonance holes is used to change the noise elimination frequency, so that the real-time noise reduction frequency matches "the real-time rotation speed of the compressor corresponds to the peak frequency of the cavity noise generated by the double frequency harmonic peak excitation of the fundamental frequency", and realizes noise reduction and noise reduction.

Description

A sound-absorbing shell with an adjustable opening number of resonance holes, a compressor, and a sound-absorbing method

technical field

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

Background technique

The noise of the compressor mainly comes from the internal noise of the shell and the vibration radiation noise of the shell.

The internal noise of the shell includes the slapping noise of the valve plate, the eruption noise of the high-speed flow of refrigerant, the friction noise of the structural parts, the electromagnetic noise, the vibration noise of the structural parts, etc., among which the slapping noise of the suction and exhaust valve plates and the noise in the cylinder and cylinder head parts The high-speed flow of refrigerant has the highest proportion of eruption noise.

Since the suction of the compressor is indirect suction, the air inlet of the suction muffler is not directly connected to the shell, and the air inlet of the suction muffler is connected to the inner cavity of the shell, so the flapping noise of the valve plate and the high-speed flow of refrigerant erupt Noise and suction pressure pulsations are transmitted to the internal cavity of the shell through the suction muffler, which can reduce part of the noise and pulsation, but still provoke the response of the internal cavity of the shell. The cavity inside the shell is a closed structure, and there are acoustic modes. The acoustic mode changes with the volume and size of the cavity. The main contribution is the first three modes, which are located in the range of 630-1000Hz. The smaller the volume, the higher the frequency. high. Under the excitation of noise and pulsation, resonance will be generated, the noise will be amplified, and cavity resonance noise will be generated.

The noise and pulsation excitation of reciprocating piston compressors are the multiples of the fundamental frequency of rotation, so within the full speed range of the compressor, the harmonics of the multiples of the fundamental frequency must cover the entire frequency band. There must be an excitation peak near the modal frequency of the shell cavity, thereby exciting resonance. Therefore, cavity resonance noise is an inherent attribute of compressor noise and cannot be eliminated. At present, the noise excitation can only be reduced by optimizing the muffler.

The vibration radiation noise of the casing comes from the external radiation noise generated by the vibration response of the casing under the vibration excitation of the movement, and the external radiation noise generated by the acoustic vibration coupling of the casing internal noise excitation.

Contents of the invention

The object of the present invention is to provide a muffler housing, a compressor and a muffler method with an adjustable opening number of resonant holes, which can reduce the resonant noise of the cavity by reducing the volume of the cavity, and change the number of resonant holes in the open state Realize self-adaptive adjustment and muffler in the full speed range.

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

A muffler shell with an adjustable opening number of resonance holes, comprising an upper shell, an upper inner shell, a lower shell, a sealing plate and a driving device;

The upper inner shell is located inside the upper outer shell, the edge of the upper inner shell is connected to the edge of the upper outer shell, and a first cavity is left between the upper inner shell and the upper outer shell;

The edge of the upper shell and/or the edge of the upper inner shell fits the edge of the lower shell, and a second cavity is left 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 communicate with the first cavity and the second cavity;

The sealing plate is movably connected to the upper inner shell, and the sealing plate can move relative to the upper inner shell to sequentially open and close the resonance holes and change the number of resonance holes in the open state;

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

Preferably, a guide rod is provided on the sealing plate, a guide seat is provided on the upper inner shell, the guide rod is slidably connected to the guide seat, and the guide rod can move relative to the guide seat;

The guide rod moves relative to the guide seat 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 drive device includes a rack, a motor and a drive gear, the rack is arranged on one side of the sealing plate or the guide rod, the motor is assembled on the upper inner shell, and the motor The rotating end is provided with the driving gear, and the driving gear meshes with the rack; the rotating end of the motor rotates forward or reverse to a set angle to drive the sealing plate to move a set distance relative to the upper inner shell .

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

Preferably, there are six resonance holes, 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 several protrusions and depressions toward the side of the second cavity.

Preferably, the outer contours of the protrusion and the recess are stepped.

Preferably, the edge of the upper inner shell fits with the edge of the upper shell, the edge of the lower shell is provided with an annular notch, and the edge of the upper shell fits in the annular notch.

A compressor, including a core assembly, a frequency converter, and a controller. The compressor is provided with the above-mentioned muffler housing with an adjustable opening number of resonance holes, and the core assembly is located inside the second cavity. The controller is respectively connected to the frequency converter and the driving device through signal cables, and the controller controls the action of the driving device according to the output frequency of the frequency converter.

A compressor noise reduction method, using the above-mentioned compressor,

The controller stores "the peak frequency of the cavity noise generated by the peak frequency of the multiplier harmonic of the fundamental frequency corresponding to the speed of the compressor", "the quantitative relationship between the speed of the compressor and the output frequency of the frequency converter" and "the The number of resonance holes corresponds to the anechoic frequency";

The method comprises the steps of:

The compressor is running, and the controller reads the real-time output frequency of the frequency converter to obtain the real-time speed of the compressor, and then obtains "the real-time speed of the compressor corresponds to the peak frequency of the cavity noise generated by the excitation of the multiplier harmonic peak of the fundamental frequency ";

The controller controls the action of the driving device to drive the sealing plate to move relative to the upper inner shell to sequentially open and close the resonance holes, change the number of resonance holes in the open state, and make the real-time noise reduction frequency Match "the real-time rotational speed of the compressor corresponds to the peak frequency of the cavity noise generated by the double frequency harmonic peak excitation of the fundamental frequency".

The beneficial technical effect of the present invention is:

In the muffler housing, compressor and muffler method with adjustable number of resonant hole openings of the present invention, the volume of the second cavity is reduced by setting the first cavity, and the volume of the second cavity is reduced to increase the volume of the second cavity. The cavity modal frequency of the second cavity avoids resonance at the lower peak frequency of the multiplier harmonic of the fundamental frequency near the cavity modal frequency of the second cavity; the first cavity is arranged between the upper inner shell and the upper outer shell, And a plurality of resonance holes are opened in the upper inner shell, so that the first cavity forms a Helmholtz resonance type silencer cavity, and the sound elimination is realized through the Helmholtz resonance type silencer cavity; the sealing plate moves relative to the upper inner shell to open in turn , Close the resonance hole, change the number of resonance holes in the open state, and change the muffler frequency by changing the number of resonant holes in the open state, so that the real-time muffler frequency matches "the real-time speed of the compressor corresponds to the multiplier of the fundamental frequency Harmonic peak frequency” to achieve noise reduction; in addition, the upper inner shell forms several protrusions and depressions on the side of the second cavity to achieve refraction noise reduction; in addition to refraction noise reduction, it also continues Sound insulation through the upper inner shell, and then sound insulation through the upper shell. In this way, the compressor achieves a good noise reduction effect by reducing cavity resonance noise, resonance noise reduction (the noise reduction frequency can be adjusted and changed), refraction noise reduction, upper inner casing sound insulation and upper casing sound insulation.

Description of drawings

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

Fig. 2 is the second cross-sectional view of the compressor of the embodiment of the present invention;

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

Figure 4 is an exploded view of a sealing plate and a driving device according to an embodiment of the present invention;

Fig. 5 is a cross-sectional view of the upper shell, the upper inner shell, the sealing plate and the driving device according to the embodiment of the present invention;

Fig. 6 is a bottom view of the upper 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 1 of the upper inner shell of the embodiment of the present invention;

Fig. 8 is a second perspective view of the upper inner shell of 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 ways

In order to make the object, technical solution and beneficial effect of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. Certain embodiments of the invention will 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 these set forth embodiments; rather, these embodiments are provided so that this invention will satisfy applicable legal requirements.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inner", "outer", "upper", "lower", "front", "rear" etc. are based on the Orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.

In an embodiment of the present invention, a sound-absorbing housing, a compressor, and a sound-absorbing method with adjustable openings of resonance holes are provided, as shown in FIGS. 1 to 9 .

A muffler shell with an adjustable opening number of resonance holes includes an upper 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 to the edge of the upper outer shell 11 , and a first cavity 51 is left between the upper inner shell 12 and the upper outer shell 11 . Wherein, the upper shell 11 and the upper inner shell 12 are stamped and formed by a steel plate using a stamping process. The thickness of the upper shell 11 is large, the thickness of the upper inner shell 12 is small, and the total thickness of the upper shell 11 and the upper inner shell 12 is the same as that of the lower shell 2 . The outer shape and size of the upper shell 11 and the lower shell 2 remain unchanged, without affecting the overall height and size of the compressor, achieving compatibility with the design of end products (such as refrigerators, etc.), and reducing costs.

The edges of the upper inner shell 12 and the edges of the upper outer shell 11 are in interference fit, so as to realize the tight connection between the edges of the upper inner shell 12 and the edges of the upper shell 11 . The edge of the upper inner shell 12 is stacked on the inner wall of the upper shell 11 , and the edge outer wall of the upper shell 11 matches the edge of the lower shell 2 , and a second cavity 52 is left between the upper inner shell 12 and the lower shell 2 . Specifically, the edge of the lower shell 2 is provided with an annular notch 21 , and the edge of the upper shell 11 fits in the annular notch 21 , and the upper shell 11 and the lower shell 2 are assembled and fixed. In this way, the edge of the upper inner shell 12 and the edge of the upper shell 11 are limited and squeezed tightly by the annular notch 21 of the lower shell 2 , so that the edge of the upper inner shell 12 and the edge of the upper shell 11 are firmly matched.

By arranging the first cavity 51, to reduce the volume of the second cavity 52, improve the cavity modal frequency of the second cavity 52, avoid the lower peak frequency of the double frequency harmonic of the fundamental frequency in the cavity of the second cavity 52 Resonance is excited near the cavity mode frequency to reduce cavity resonance noise.

The speed of the compressor is usually 1200-4500rpm, and the corresponding base frequency is 20-75Hz. For example, when the compressor runs at 3000rpm, the base frequency is 50Hz, and there are integer multiple peaks of 50Hz in the whole frequency band, such as 100HJz, 150Hz, 200Hz, 250Hz, etc. Peak, the peak frequency of the multiplier harmonic of the fundamental frequency increases, and its corresponding excitation energy attenuates accordingly. In this way, the higher peak frequency of the multiplier harmonic 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 defines at least two resonance holes 121 , and the resonance holes 121 communicate with the first cavity 51 and the second cavity 52 . By opening the resonance hole 121 connecting the first cavity 51 and the second cavity 52 on the upper inner shell 12, the first cavity 51 forms a Helmholtz resonance type sound-absorbing cavity, and the Helmholtz resonance type sound-absorbing cavity The cavity is anechoic to eliminate noise of a specific frequency.

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

The driving device 4 acts to drive the sealing plate 3 to move 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, and the guide seat 62 is provided with a limit opening 621, and the guide rod 61 is slidably connected in the limit opening 621 of the guide seat 62, and guide The 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 holes 124 on the inner shell 12 through the screws 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 shell 12 , and each resonance hole 121 is arranged on the upper inner shell 12 along the moving direction of the sealing plate 3 .

In this embodiment, each resonance hole 121 is 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 distances between adjacent resonance holes 121 may be the same or different. There are six resonance holes 121 , the six resonance holes 121 have the same diameter, 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, when the sealing plate 3 moves from the first row to the third row of resonance holes 121, the number of opened resonance holes 121 increases rapidly, and the corresponding noise reduction frequency increases rapidly; otherwise, the sealing plate 3 moves from the third row to the third row. During the movement of a row of resonant holes 121, the number of closed resonant holes 121 decreases rapidly, and the corresponding noise reduction frequency decreases rapidly.

The driving device 4 includes a rack 41, a motor 42 and a driving gear 43. A rack 41 is arranged on one side of the sealing plate 3, a motor 42 is assembled on the upper inner shell 12, and a driving gear 43 is arranged at the rotating end of the motor 42, and the driving gear 43 meshes rack 41. Wherein, the motor 42 is arranged on the motor base 421 , and the motor base 421 is assembled and connected to the second screw hole 125 on the inner shell 12 through the screw 8 . The rotating end of the motor 42 rotates forward or reversely to set the angle, and the drive gear 43 drives the rack 41 to move the set distance, so as to drive the sealing plate 3 to move the set distance relative to the upper inner shell 12, so that the sealing plate 3 moves relative to the upper inner shell. During the movement of the shell 12, the six resonance holes 121 are opened and closed sequentially, thereby changing the number of the resonance holes 121 in the open state, and changing the area of the resonance holes 121 in the open state.

By "changing the number of resonant holes 121 in the open state, and changing the area of the resonant holes 121 in the open state", the noise cancellation frequency can be changed. Specifically, the number of opened resonant holes 121 increases, and the area of the resonant holes 121 in the open state becomes larger, and the corresponding noise reduction frequency increases; the number of opened resonant holes 121 decreases, and the area of the resonant holes 121 in the open state becomes smaller, Then the corresponding muffler frequency decreases. Make the real-time noise reduction frequency match "the real-time rotational speed of the compressor corresponds to the peak frequency of the cavity noise generated by the harmonic peak excitation of the fundamental frequency's multiplier", to achieve noise reduction.

The shape of the current compressor shell is generally close to a sphere, and the outline of the internal cavity of the shell is also close to a sphere. Various noises generated by the components of the compressor core, etc. propagate outward and radiate first to the inner surface of the shell. Since the inner surface is close to a sphere, all directions The propagating sound waves are all vertically incident on the shell, and there is no effective refraction and noise reduction effect, so the noise can only be reduced by the sound insulation effect of the shell.

In the muffler housing with adjustable cavity volume in this embodiment, the upper inner shell 12 forms several protrusions 122 and depressions 123 on the side of the second cavity 52, more specifically, the protrusions 122 and depressions The outer contour of 123 is stepped. The combination of the protruding part 122 and the concave part 123 forms a plurality of similar wedge structures with angles. When the sound wave is incident on the surface of the upper inner shell 12 and the lower shell 2, refraction and reflection occur on the surface of the upper inner shell 12 and the lower shell 2, with angled The wedge-like structure can refract noise multiple times and gradually attenuate the noise to achieve refraction and noise reduction to reduce noise.

A compressor, including a core assembly 7, a frequency converter and a controller. The compressor is provided with the muffler housing with an adjustable opening number of resonance holes as described above in this embodiment. The core assembly 7 is located inside the second cavity 52, and the control The converters are respectively connected to the frequency converter and the driving device 4 via signal cables, and the controller controls the action of the driving device 4 according to the output frequency of the frequency converter.

A compressor noise reduction method, using the above-mentioned compressor of the present embodiment, the controller stores "the cavity noise peak frequency generated by the rotation speed of the compressor corresponding to the double frequency harmonic peak of the fundamental frequency", "the rotation speed of the compressor Quantitative relationship with the output frequency of the inverter" and "the number of resonance holes in the open state corresponds to the silencer frequency";

The method comprises the steps of:

The structural shape of the compressor shell and the structural layout of the core determine the cavity structure and volume inside the shell. When the cavity structure and volume are constant, the acoustic modal frequency can be determined. Through the combination of modal simulation and experimental testing The method can accurately obtain the cavity mode frequency.

After the compressor frequency converter receives the signal from the main control board of the refrigerator, it controls the compressor to run at the specified speed. The cavity noise peak frequency generated by the harmonic peak excitation of the fundamental frequency's double frequency";

The highest peak frequency of cavity noise at different speeds can be obtained by obtaining the compressor cavity modal frequency and "the real-time compressor rotation speed corresponds to the peak frequency of the multiplier harmonic of the fundamental frequency, that is, the excitation frequency". The modal frequency is an inherent property, and its frequency is constant. The excitation frequency corresponding to the compressor speed changes. When the excitation frequency is close to the cavity modal frequency, resonance amplification noise will be generated. The closer the excitation frequency is, the more obvious the resonance is. Therefore, the frequency with the most obvious resonance at each speed can be calculated, that is, the cavity noise peak frequency.

The noise reduction peak frequency of the Helmholtz resonance type muffler is mainly affected by the volume of the resonance cavity, the length, diameter and number of the resonance holes. Acoustic frequency, the number of opened resonance holes 121 increases, and the area of the resonance holes 121 in the open state becomes larger, and the corresponding noise reduction frequency increases; the number of opened resonance holes 121 decreases, and the area of the resonance holes 121 in the open state becomes smaller, Then the corresponding muffler frequency decreases. Through simulation calculations and experimental tests, the number and area of different resonant holes 121 are determined in advance to determine the corresponding noise reduction frequency, and the optimal number and area of resonant holes at this speed can be obtained by combining the cavity noise peak frequency at each speed.

All the above parameters are embedded in the controller. When the compressor is working normally, the controller reads the real-time output frequency of the inverter to obtain the real-time speed of the compressor, obtain the peak frequency of cavity noise, and then obtain the optimal number and area of resonance holes .

The controller controls the action of the driving device 4 to drive the sealing plate 3 to move relative to the upper inner shell 12, so as to open and close the resonance holes 121 in sequence, change the number of the resonance holes 121 in the open state, and achieve the optimal number and area of the resonance holes, so that Real-time noise reduction frequency matching "the real-time rotation speed of the compressor corresponds to the peak frequency of the cavity noise generated by the double frequency harmonic peak excitation of the fundamental frequency". In this way, adaptive noise reduction in the full speed range is realized, and cavity noise is reduced.

So far, the present embodiment has been described in detail with reference to the drawings. Based on the above description, those skilled in the art should have a clear understanding of the muffler casing, compressor and muffler method with adjustable opening number of resonance holes of the present invention. In the muffler housing, compressor and muffler method with adjustable number of resonant hole openings of the present invention, the first cavity 51 is provided to reduce the volume of the second cavity 52, and the volume of the second cavity 52 is reduced. , to increase the cavity modal frequency of the second cavity 52, and avoid resonance at the lower peak frequency of the multiplier harmonic of the fundamental frequency near the cavity modal frequency of the second cavity 52; the upper inner shell 12 and the upper outer shell 11 A first cavity 51 is arranged between them, and a plurality of resonance holes 121 are opened in the upper inner shell 12, so that the first cavity 51 forms a Helmholtz resonance type muffler cavity, and the noise elimination is realized through the Helmholtz resonance type muffler cavity; The sealing plate 3 moves relative to the upper inner shell 12 to open and close the resonance holes 121 sequentially, change the number of the resonance holes 121 in the open state, and change the noise elimination frequency by changing the number of the resonance holes 121 in the open state, so that the real-time noise reduction Acoustic frequency matching "the real-time rotation speed of the compressor corresponds to the peak frequency of the multiplier harmonic of the fundamental frequency" to achieve noise reduction; in addition, the upper inner shell 12 forms several raised parts 122 and The recessed part 123 is used to achieve refraction sound elimination; in addition to the refraction sound elimination, the upper inner shell 12 is also used for sound insulation, and then the upper outer shell 11 is used for sound insulation. In this way, the compressor achieves good noise reduction by reducing cavity resonance noise, resonance noise reduction (the noise reduction frequency can be adjusted), refraction noise reduction, upper inner shell 12 sound insulation and upper outer shell 11 sound insulation Effect.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present 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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