Silencing device for suppressing resonance noise of cavity of compressor

Abstract

The invention discloses a silencing device for suppressing resonance noise of a cavity of a compressor, and relates to the technical field of silencing, the silencing device comprises a resonator, a pipe cavity is arranged in the resonator, the pipe cavity is communicated with the cavity of the compressor through a communication hole, and a sound absorption layer is arranged on the inner wall of the pipe cavity. According to the silencing device for suppressing the resonance noise of the cavity of the compressor, broadband noise can be eliminated, and the operation stability of the compressor is improved.

Description

Technical Field

[0001] The invention relates to the technical field of silencing, and in particular to a silencing device for suppressing resonance noise of a compressor cavity. Background Art

[0002] Existing household refrigeration compressors are usually sealed in a shell, and the cavity inside the shell serves as a space for the refrigerant to flow and for storing lubricating oil. However, due to the pulse movement of the suction valve, the flow of refrigerant, and the vibration of the compressor body during the operation of the compressor, strong acoustic vibrations will be generated inside the cavity. When the excitation of certain frequencies matches the inherent acoustic mode of the cavity, it is easy to cause resonance, which not only produces obvious and sharp noise, but also affects the stability of the compressor.

[0003] Existing methods for reducing noise generated by compressor cavity resonance have limitations and cannot eliminate broadband noise. Summary of the invention

[0004] The object of the present invention is to provide a silencer for suppressing the resonance noise of a compressor cavity, which can eliminate broadband noise and improve the operating stability of the compressor.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a muffler for suppressing resonance noise of a compressor cavity, comprising: a resonator, wherein a tube cavity is arranged in the resonator, the tube cavity is connected with the compressor cavity through a connecting hole, and an inner wall of the tube cavity is provided with a sound absorbing layer.

[0007] Preferably, the lumens are spirally coiled in the same plane.

[0008] Preferably, the cross-section of the lumen is rectangular.

[0009] Preferably, a partition is provided between the tube cavities of adjacent circles, and the thickness of the partition is the same as the thickness of the side wall of the outer side of the tube cavity of the outermost circle.

[0010] Preferably, the sound absorbing layer is arranged on a side wall of the tube cavity which is perpendicular to the plane where the tube cavity is located.

[0011] Preferably, the sound absorbing layer is made of glass wool.

[0012] Preferably, the relationship between the length of the lumen and the resonance frequency is:

[0013]

[0014] Among them, f nis the resonance frequency, n is the resonance order, n is 1, C is the sound velocity of the refrigerant fluid in the lumen; L is the length of the lumen; d is the equivalent diameter of the lumen; x is the correction coefficient.

[0015] Preferably, the communicating hole is communicated with one end of the lumen.

[0016] Preferably, the axial direction of the communicating hole is arranged perpendicular to the plane where the lumen is located.

[0017] Preferably, the size of the communicating hole is the same as the cross-sectional size of the lumen.

[0018] Compared with the prior art, the present invention has achieved the following technical effects:

[0019] The sound absorbing layer in the muffler for suppressing the resonance noise of the compressor cavity of the present invention can effectively increase the broadband sound absorption characteristics, solving the shortcomings of the narrow sound absorption band of the reactive resonator and requiring a combination of multiple resonators to achieve broadband noise reduction. The present invention combines the resonator with the sound absorbing layer, effectively broadening the low-frequency sound absorption bandwidth of the muffler. The present invention is suitable for low-frequency resonance suppression, and realizes a broadband noise reduction effect for compressor noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic structural diagram of the silencing device for suppressing the resonance noise of the compressor cavity of the present invention being installed on the compressor housing;

[0022] Figure 2 It is a schematic structural diagram of a muffler device for suppressing resonance noise of a compressor cavity according to the present invention;

[0023] Figure 3 It is a perspective structural schematic diagram of a muffler device for suppressing resonance noise of a compressor cavity according to the present invention;

[0024] Figure 4 It is a cross-sectional schematic diagram of a muffler device for suppressing resonance noise of a compressor cavity according to the present invention;

[0025] Figure 5 It is a curve diagram of the simulation results of the noise reduction effect of the first solution and the compressor without a resonator;

[0026] Figure 6It is a curve diagram of the simulation results of the noise reduction effect of the first scheme, the second scheme and the compressor without a resonator;

[0027] In the figure: 1. sealed shell of compressor; 2. silencer for suppressing resonance noise of compressor cavity; 21. connecting hole; 3. tube cavity; 4. sound absorbing layer; 5. partition. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The object of the present invention is to provide a silencer for suppressing the resonance noise of a compressor cavity, which can eliminate broadband noise and improve the operating stability of the compressor.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figures 1 to 4 As shown, this embodiment provides a silencer 2 for suppressing the resonance noise of the compressor cavity. In order to suppress the noise generated by the air resonance of the compressor, the silencer 2 for suppressing the resonance noise of the compressor cavity of this embodiment is installed on the sealed shell 1 of the compressor, including: a resonator, which is a quarter-wavelength tube resonator. The resonator can be installed on the sealed shell 1 of the compressor by integral casting to ensure good air tightness. A tube cavity 3 is provided in the resonator. The tube cavity 3 is connected to the compressor cavity through a connecting hole 21, and a sound absorbing layer 4 is provided on the inner wall of the tube cavity 3. This embodiment combines the resonator with the sound absorbing layer 4 to improve the low-frequency and broadband sound absorption characteristics. Compared with the prior art, this embodiment can effectively broaden the silencing bandwidth, achieve better noise reduction performance while ensuring a compact structure, and is suitable for noise reduction optimization of household and industrial refrigeration compressors.

[0032] Specifically, in this embodiment, the tube cavity 3 is spirally wound in the same plane to reduce the thickness of the device, making it suitable for compact compressors. The resonator is a rectangular parallelepiped, and the tube cavity 3 forms multiple 90° angle bend structures in the same plane.

[0033] In this embodiment, the cross section of the lumen 3 is rectangular, preferably square.

[0034] In this embodiment, a partition 5 is provided between adjacent circles of the tube lumens 3 , and the thickness of the partition 5 is the same as the thickness of the side wall of the outer side of the tube lumen 3 of the outermost circle.

[0035] In this embodiment, the sound absorbing layer 4 is made of glass wool, and the extension direction of the sound absorbing layer 4 is the same as the extension direction of the lumen 3. The sound absorbing layer 4 is arranged on each inner wall of the lumen 3 or on the inner side of the side wall of the lumen 3 perpendicular to the plane where the lumen 3 is located, so as to increase the viscous loss of low-frequency sound waves, improve the sound elimination effect, and increase the broadband sound absorption performance of the sound elimination device.

[0036] In this embodiment, the two side walls of the lumen 3 parallel to the axial direction of the communicating hole 21 are rigid wall surfaces.

[0037] In this embodiment, the relationship between the length of the lumen 3 and the resonance frequency is:

[0038]

[0039] Among them, f n is the resonance frequency, n is the resonance order, n is 1, C is the sound velocity of the refrigerant fluid in the tube cavity 3; L is the length of the tube cavity 3, that is, the length of the quarter-wavelength tube resonator; d is the equivalent diameter of the tube cavity 3; x is the correction coefficient.

[0040] According to the resonance frequency f n The lengths of the tube cavity 3 and the sound absorbing layer 4 can be determined, thereby determining the overall structural dimensions of the silencer.

[0041] In this embodiment, the axial direction of the communicating hole 21 is perpendicular to the plane where the lumen 3 is located, the communicating hole 21 is connected to the inner end of the lumen 3, and the outer end of the lumen 3 is a closed end.

[0042] In this embodiment, the size of the communicating hole 21 is the same as the cross-sectional size of the lumen 3. The communicating hole 21 is preferably a square hole, and the side lengths of the communicating hole 21 and the cross-sectional size of the lumen 3 are both 10 mm.

[0043] In this embodiment, the resonator is set to have a sound silencing characteristic for the same resonant frequency as the resonant frequency of the compressor cavity; the sound absorbing layer 4 can be made of glass wool, which is composed of glass fibers and has an ultra-high porosity, allowing sound waves to easily enter. It is suitable for medium and high frequency sound absorption, and although the sound absorption coefficient is low at low frequencies, it can effectively increase thermal viscous losses as the inner lining of the resonator, thereby improving its sound absorption capacity at low frequencies.

[0044] In this embodiment, the connecting hole 21 has the same cross-section as the tube cavity 3, both of which are squares with a side length of 10 mm. The resonator tube cavity 3 undergoes five vertical bends and has an overall rectangular appearance. The thickness of the sound absorbing layer 4 is 4 mm, and the height of the sound absorbing layer 4 is the same as the cross-sectional size of the tube cavity 3, both of which are 10 mm. The length of the tube cavity 3 is determined by the resonance frequency.

[0045] Simulation comparison:

[0046] In order to verify the effectiveness of the technical solution of the present invention, two comparative solutions were established. The first solution is a compressor equipped with a quarter-wavelength tube resonator without the sound absorbing layer 4, and the second solution is a compressor equipped with a quarter-wavelength tube resonator with the sound absorbing layer 4 as the inner lining. In addition, a compressor without a resonator is used as a reference model to better evaluate the noise reduction effect of the two solutions.

[0047] The simulation uses a typical compressor cavity with a volume of 0.001359m 3 , and filled with refrigerant fluid R134A, the density of the refrigerant fluid is 3.73Kg / m 3 , the speed of sound of the refrigerant fluid is 172.3m / s.

[0048] The length of the resonance cavity 3 is 110 mm, the wall thickness of the silencer is 2 mm, the depth of the connecting hole 21 is 2 mm, the thickness of the sound absorbing layer 4 is 4 mm, the thickness of the silencer as a whole is 14 mm, and the shape of the silencer is a rectangle of 82 x 62 mm.

[0049] Figure 5 The results obtained by simulation for the first solution and the compressor without resonator are shown in Figure 2. Figure 5 Curve a is a sound pressure level frequency response curve of a reference model of a compressor without a resonator, and curve b is a sound pressure level frequency response curve of a simulation model set according to the first scheme. Figure 5 The middle curve a has a peak value, and the corresponding frequency is the resonance frequency of the compressor without a resonator. After implementing the first solution, it can be seen that compared with the simulation results of the reference model of the compressor without a resonator, the amplitude of the sound pressure level at the resonance frequency of the compressor cavity has been significantly reduced. However, the first solution produces two secondary peaks, and the sound pressure level amplitudes corresponding to the two secondary peaks are close, which are smaller than the sound pressure level amplitude at the resonance frequency of the compressor cavity. Figure 5 It can be seen that after adding the quarter-wavelength tube resonator, the overall noise is reduced, achieving the effect of noise reduction, but two secondary peaks are generated.

[0050] The second solution is analyzed and evaluated: The second solution is the solution adopted in the embodiment of the present invention, and the sound absorbing layer 4 is used as the inner lining of the quarter-wavelength tube resonator. The same settings are used as the first solution, and the results obtained by simulation calculation are plotted on Figure 6 In order to better compare the two, the results of the first solution and the reference model of the compressor without resonator are also plotted in Figure 6 middle.

[0051] like Figure 6As shown, the image of the result of the second solution is curve c, which has only one peak. Compared with the first solution, the amplitude of the sound pressure level corresponding to the peak is further reduced, that is, the secondary peak caused by the single-frequency quarter-wavelength tube resonator in the first solution is eliminated, and a better silencing effect is achieved. It can be seen that the present invention uses the sound absorbing layer 4 as the inner lining of the quarter-wavelength tube resonator, which has a silencing effect with a wider silencing frequency band.

[0052] The tube cavity 3 of the quarter-wavelength tube resonator in the silencer 2 for suppressing the resonance noise of the compressor cavity of this embodiment is spirally coiled in the same plane. The spiral coiling arrangement effectively reduces the thickness of the silencer, making it smaller in size, less affected in the overall appearance of the compressor, and more practical. The sound absorption layer 4 in the silencer 2 for suppressing the resonance noise of the compressor cavity of this embodiment can effectively increase the broadband sound absorption characteristics, solving the shortcomings of the narrow sound absorption band of the reactive resonator and requiring a combination of multiple resonators to achieve broadband noise reduction. This embodiment combines the quarter-wavelength tube resonator with the sound absorption layer 4, effectively broadening the low-frequency sound absorption bandwidth of the silencer. This embodiment is suitable for low-frequency resonance suppression to achieve a broadband noise reduction effect for compressor noise.

[0053] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A muffler for suppressing the resonance noise of a compressor cavity, characterized in that: include: The resonator has a tube cavity arranged inside, the tube cavity is connected with the compressor cavity through a connecting hole, and a sound absorbing layer is arranged on the inner wall of the tube cavity.

2. The muffler device for suppressing the resonance noise of the compressor cavity according to claim 1, characterized in that: The lumens are arranged spirally in the same plane.

3. The muffler device for suppressing the resonance noise of the compressor cavity according to claim 1, characterized in that: The cross section of the lumen is rectangular.

4. The muffler device for suppressing the resonance noise of the compressor cavity according to claim 1, characterized in that: A partition is provided between the tube cavities of adjacent circles, and the thickness of the partition is the same as the thickness of the side wall of the outer side of the tube cavity of the outermost circle.

5. The muffler device for suppressing the resonance noise of the compressor cavity according to claim 1, characterized in that: The sound absorbing layer is arranged on a side wall of the tube cavity which is perpendicular to the plane where the tube cavity is located.

6. The muffler device for suppressing the resonance noise of the compressor cavity according to claim 1, characterized in that: The sound absorbing layer is made of glass wool.

7. The muffler device for suppressing the resonance noise of the compressor cavity according to claim 1, characterized in that: The relationship between the length of the lumen and the resonant frequency is: Among them, f n is the resonance frequency, n is the resonance order, n is 1, C is the sound velocity of the refrigerant fluid in the lumen; L is the length of the lumen; d is the equivalent diameter of the lumen; x is the correction coefficient.

8. The muffler device for suppressing the resonance noise of the compressor cavity according to claim 1, characterized in that: The communicating hole is communicated with one end of the lumen.

9. The muffler device for suppressing the resonance noise of the compressor cavity according to claim 1, characterized in that: The axial direction of the communicating hole is arranged perpendicular to the plane where the lumen is located.

10. The muffler device for suppressing the resonance noise of the compressor cavity according to claim 1, characterized in that: The size of the communicating hole is the same as the cross-sectional size of the lumen.

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