A vacuum-sealed double-layer noise-reducing housing, a compressor, and a vacuum pumping method

Abstract

The present invention provides a vacuum-sealed double-layer noise-reducing housing, a compressor and a vacuum pumping method, which relate to the technical field of compressor noise reduction. The vacuum-sealed double-layer noise-reducing housing of the present invention reduces the volume of the second cavity by setting the first cavity, increases the cavity modal frequency of the second cavity, and avoids the excitation of resonance near the cavity modal frequency by the lower peak frequency of the multiple-frequency harmonic of the fundamental frequency, so as to reduce the cavity resonance noise; the upper inner shell forms a convex part and a concave part on one side of the second cavity to achieve refraction noise elimination; in addition to refraction noise elimination, the upper inner shell is also used for sound insulation, then vacuum sound insulation is carried out through the vacuum cavity, and finally sound insulation is carried out through the upper outer shell. In this way, under the five-fold action of reducing cavity resonance noise, refraction noise elimination, upper inner shell sound insulation, vacuum cavity sound insulation and upper outer shell sound insulation, the compressor achieves good noise reduction effect. The method of the present invention can conveniently and efficiently pump the first cavity of the compressor to a vacuum state and keep the first cavity in a vacuum state.

Description

Technical Field

[0001] The present invention relates to the technical field of compressor noise reduction, and specifically relates to a vacuum-sealed double-layer noise reduction housing, a compressor, and a vacuum pumping method. Background Art

[0002] The noise of the compressor mainly comes from the internal noise of the housing and the noise radiated by the vibration of the housing.

[0003] The internal noise of the housing includes valve plate flapping noise, refrigerant high-speed flow and ejection noise, structural member friction noise, electromagnetic noise, structural member vibration noise, etc. Among them, the suction and exhaust valve plate flapping noise and the refrigerant high-speed flow and ejection noise in the cylinder and cylinder head components account for the highest proportion.

[0004] Since the compressor sucks air indirectly, the intake port of the intake silencer is not directly connected to the housing, but is connected to the internal cavity of the housing. The valve plate flapping noise, refrigerant high-speed flow and ejection noise, and suction pressure pulsation are transmitted to the internal cavity of the housing through the intake silencer. The intake silencer can reduce a part of the noise and pulsation, but still can arouse the response of the internal cavity of the housing. The internal cavity of the housing is a closed structure with acoustic modes, which change with the volume and size of the cavity. The main contributions are the first three modes, which are in the range of 630 - 1000 Hz. The smaller the volume, the higher the frequency. Under the excitation of noise and pulsation, resonance will occur, amplifying the noise and generating cavity resonance noise.

[0005] The noise and pulsation excitation of the reciprocating piston compressor are both multiples of the rotational fundamental frequency. Therefore, within the full speed range of the compressor, the harmonic multiples of the fundamental frequency will necessarily cover the entire frequency band. There must be an excitation peak near the cavity mode frequency of the housing, thus exciting resonance. Therefore, the cavity resonance noise is an inherent property of the compressor noise and cannot be eliminated. Currently, only the noise excitation can be reduced by optimizing the silencer.

[0006] The noise radiated by the vibration of the housing comes from the vibration response of the housing excited by the vibration of the core and the noise radiated outward by the vibration generated by the acoustic-vibration coupling of the internal noise of the housing. Summary of the Invention

[0007] The purpose of the present invention is to provide a vacuum-sealed double-layer noise reduction housing, a compressor, and a vacuum pumping method, to reduce the cavity resonance noise, and to increase the vacuum sound insulation by setting a vacuum cavity to reduce the noise of the compressor.

[0008] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0009] A vacuum-sealed double-layer noise reduction housing includes an upper outer shell, an upper inner shell, a lower shell, and a one-way sealing assembly;

[0010] The upper inner shell is located inside the upper outer shell, and the edge of the upper inner shell is sealingly connected to the edge of the upper outer shell. A first cavity is left between the upper inner shell and the upper outer shell;

[0011] The edge of the upper outer shell and / or the edge of the upper inner shell cooperate with the edge of the lower shell, and a second cavity is left between the upper inner shell and the lower shell;

[0012] At least one ventilation hole is opened in the upper inner shell, and the ventilation hole communicates the first cavity and the second cavity;

[0013] The one-way sealing assembly is arranged on the upper inner shell. In the initial state, the one-way sealing assembly closes the ventilation hole; when the air pressure in the second cavity is less than the air pressure in the first cavity, under the action of the air pressure difference between the first cavity and the second cavity, the one-way sealing assembly opens the ventilation hole;

[0014] Continuously evacuate the space where the second cavity is located to form a vacuum in the first cavity. The one-way sealing assembly closes the ventilation hole to keep the first cavity in a vacuum state.

[0015] Preferably, a guiding channel is arranged on one side of the upper inner shell where the ventilation hole is located;

[0016] The one-way sealing assembly includes a guiding rod, a support seat, a sealing gasket, a spring and a fixing seat. The guiding rod is slidably connected in the guiding channel. A support seat is arranged at one end of the guiding rod located in the second cavity. A sealing gasket is arranged on the inner end face of the support seat. A spring and a fixing seat are sequentially assembled at one end of the guiding rod located in the first cavity. One end of the spring is connected to the fixing seat, and the other end of the spring is connected to the upper inner shell;

[0017] In the initial state of the one-way sealing assembly, under the elastic force of the spring, the sealing gasket contacts the upper inner shell and closes the ventilation hole; when the air pressure in the second cavity is less than the air pressure in the first cavity, under the action of the air pressure difference between the first cavity and the second cavity, overcoming the elastic force of the spring, the sealing gasket disengages from the upper inner shell and opens the ventilation hole; after a vacuum is formed in the first cavity, under the elastic force of the spring, the sealing gasket contacts the upper inner shell and closes the ventilation hole to keep the first cavity in a vacuum state.

[0018] Preferably, at least one ring of annular protrusions is arranged on the side of the sealing gasket in contact with the upper inner shell, and the annular protrusions surround the ventilation hole.

[0019] Preferably, the upper inner shell forms a plurality of protrusions and depressions on the side towards the second cavity.

[0020] Preferably, the outer contours of the protrusions and the depressions are in a stepped shape.

[0021] Preferably, the edge of the upper inner shell is in interference fit with the edge of the upper outer shell.

[0022] Preferably, an annular notch is provided at the edge position of the lower shell, and the edge of the upper outer shell is fitted in the annular notch.

[0023] Preferably, the upper outer shell and / or the upper inner shell are formed by a stamping process.

[0024] A compressor includes a core component. The compressor is provided with the above-mentioned vacuum-sealed double-layer noise-reducing housing, and the core component is located inside the second cavity.

[0025] A method for evacuating a compressor evacuates the above-mentioned compressor. The method includes the following steps:

[0026] Place the compressor in a closed space. The second cavity is communicated with the closed space, and the closed space is connected to a vacuum pumping device;

[0027] Start the vacuum pumping device to evacuate the closed space, so that the air pressure in the second cavity is less than the air pressure in the first cavity, and the one-way sealing component opens the vent hole until the closed space is evacuated to a vacuum. The one-way sealing component closes the vent hole to keep the inside of the first cavity in a vacuum state.

[0028] The beneficial technical effects of the present invention are:

[0029] The vacuum-sealed double-layer noise-reducing housing and the compressor of the present invention reduce the volume of the second cavity by setting the first cavity, increase the cavity mode frequency of the second cavity, and avoid the excitation of resonance near the cavity mode frequency by the lower peak frequency of the multiple-frequency harmonic of the fundamental frequency, so as to reduce the cavity resonance noise; several convex parts and concave parts are formed on the side of the upper inner shell facing the second cavity to achieve refraction noise reduction; in addition to refraction noise reduction, the upper inner shell is also used for sound insulation, then vacuum sound insulation is carried out through the vacuum cavity, and finally sound insulation is carried out through the upper outer shell. In this way, under the five-fold action of reducing cavity resonance noise, refraction noise reduction, upper inner shell sound insulation, vacuum cavity sound insulation and upper outer shell sound insulation, the compressor achieves good noise reduction effect.

[0030] The method for evacuating the compressor of the present invention can conveniently and efficiently evacuate the first cavity of the compressor and keep the inside of the first cavity in a vacuum state. Description of the Drawings

[0031] Figure 1 Is a cross-section of the compressor according to the embodiment of the present invention Figure 1 ;

[0032] Figure 2 Is a cross-section of the compressor according to the embodiment of the present invention Figure 2 ;

[0033] Figure 3 This is a cross-sectional view of the upper outer shell, upper inner shell and one-way sealing assembly of the embodiment of the present invention;

[0034] Figure 4 This is a cross-sectional view of the one-way sealing assembly of the embodiment of the present invention;

[0035] Figure 5 This is a three-dimensional view of the upper inner shell of the embodiment of the present invention Figure 1 ;

[0036] Figure 6 This is a three-dimensional view of the upper inner shell of the embodiment of the present invention Figure 2 ;

[0037] Figure 7 This is a bottom view of the upper inner shell of the embodiment of the present invention. Detailed implementation manners

[0038] To make the objectives, technical solutions and beneficial effects of the present invention more clear and understandable, the following further describes the present invention in detail with reference to specific embodiments and the accompanying drawings. Some but not all of the embodiments of the present invention will be shown in the following with reference to the accompanying drawings. In fact, the various embodiments of the present invention can be implemented in many different forms and should not be construed as limited to the embodiments described herein; on the contrary, these embodiments are provided so that the present invention meets the applicable legal requirements.

[0039] 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. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0040] In an embodiment of the present invention, a vacuum-sealed double-layer noise-reducing housing, a compressor and a vacuum pumping method are provided. Please refer to Figures 1 to 7 as shown.

[0041] A vacuum-sealed double-layer noise-reducing housing includes an upper outer shell 11, an upper inner shell 12, a lower shell 2 and a one-way sealing assembly.

[0042] The upper inner shell 12 is located inside the upper outer shell 11. The edge of the upper inner shell 12 is sealingly connected to the edge of the upper outer shell 11, and a first cavity 31 is left between the upper inner shell 12 and the upper outer shell 11.

[0043] Among them, the upper outer shell 11 and the upper inner shell 12 are formed by stamping a steel plate using a stamping process. The upper outer shell 11 has a large thickness, and the upper inner shell 12 has a small thickness. The total thickness of the upper outer shell 11 and the upper inner shell 12 is the same as the thickness of the lower shell 2. The external shape and size of the upper outer shell 11 and the lower shell 2 remain unchanged, which does not affect the overall height and size of the compressor, realizes compatibility with the design of terminal products (such as refrigerators, etc.), and reduces costs.

[0044] The edge of the upper inner shell 12 is in interference fit with the edge of the upper outer shell 11 to achieve sealing between the edge of the upper inner shell 12 and the edge of the upper outer shell 11.

[0045] 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 cooperates with the edge of the lower shell 2, and a second cavity 32 is left between the upper inner shell 12 and the lower shell 2. Specifically, an annular notch 21 is provided at the edge position of the lower shell 2, and the edge of the upper outer shell 11 is fitted into the annular notch 21, and the upper outer 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 outer shell 11 are limited and tightened through 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 outer shell 11 are firmly fitted.

[0046] By setting the first cavity 31, the volume of the second cavity 32 is reduced, the cavity mode frequency of the second cavity 32 is increased, and the resonance of the lower peak frequency of the harmonic of the fundamental frequency near the cavity mode frequency is avoided, so as to reduce the cavity resonance noise.

[0047] The rotational speed of the compressor is usually 1200 - 4500 rpm, and the corresponding fundamental frequency is 20 - 75 Hz. For example, when the compressor runs at 3000 rpm, the fundamental frequency is 50 Hz, and there are peaks at integer multiples of 50 Hz in the full frequency band, such as peaks at 100 Hz, 150 Hz, 200 Hz, 250 Hz, etc. The peak frequency of the harmonic of the fundamental frequency increases, and the corresponding excitation energy decays accordingly. In this way, the resonance of the higher peak frequency of the harmonic of the fundamental frequency near the cavity mode frequency is excited, and the resonance energy is lower, reducing the cavity resonance noise.

[0048] Four vent holes 41 are opened in the upper inner shell 12 at the plane position, and the vent holes 41 communicate the first cavity 31 and the second cavity 32.

[0049] A one-way sealing component is provided on the upper inner shell 12. In the initial state, the one-way sealing component closes the vent holes 41; when the air pressure in the second cavity 32 is less than the air pressure in the first cavity 31, under the action of the air pressure difference between the first cavity 31 and the second cavity 32, the one-way sealing component opens the vent holes 41.

[0050] Continuously evacuate the space where the second cavity 32 is located to form a vacuum in the first cavity 31. The one-way sealing assembly closes the vent hole 41 to keep the first cavity 31 in a vacuum state.

[0051] Specifically, a guiding channel 42 is provided on one side of the vent hole 41 of the upper inner shell 12. In this embodiment, the guiding channel 42 is located at the middle position of the four vent holes 41.

[0052] The one-way sealing assembly includes a guiding rod 51, a support seat 52, a sealing gasket 53, a spring 54 and a fixing seat 55. The guiding rod 51 is slidably connected in the guiding channel 42. A support seat 52 is provided at one end of the guiding rod 51 located in the second cavity 32, and a sealing gasket 53 is provided on the inner end face of the support seat 52. Among them, the guiding rod 51 and the support seat 52 are integrally formed. One end of the guiding rod 51 located in the first cavity 31 is successively assembled with the spring 54 and the fixing seat 55. One end of the spring 54 is connected to the fixing seat 55, and the other end of the spring 54 is connected to the upper inner shell 12. In this embodiment, an external thread is provided at one end of the guiding rod 51 located in the first cavity 31, and the fixing seat 55 is provided as a nut. One end of the guiding rod 51 located in the first cavity 31 is threadedly connected to the fixing seat 55. In addition, the fixing seat 55 is provided as a nut, and the position of the fixing seat 55 can be adjusted to adjust the elastic force of the spring 54, so that in the initial state, under the elastic force of the spring 54, the sealing gasket 53 contacts the upper inner shell 12 and closes the four vent holes 41.

[0053] In the initial state, under the elastic force of the spring 54, the sealing gasket 53 contacts the upper inner shell 12 and closes the four vent holes 41. When the air pressure in the second cavity 32 is less than the air pressure in the first cavity 31, under the action of the air pressure difference between the first cavity 31 and the second cavity 32, overcoming the elastic force of the spring 54, the sealing gasket 53 disengages from the upper inner shell 12 and opens the vent hole 41. After a vacuum is formed in the first cavity 31, under the elastic force of the spring 54, the sealing gasket 53 contacts the upper inner shell 12 and closes the vent hole 41 to keep the first cavity 31 in a vacuum state.

[0054] As described above, the one-way sealing assembly of this embodiment can automatically realize the closing and opening actions of the vent hole 41 according to the need of evacuation. Moreover, the one-way sealing assembly of this embodiment has a simple structure and low cost.

[0055] On one side of the gasket 53 in contact with the upper inner shell 12, there is at least one ring of annular protrusions 531, and the annular protrusions 531 surround the vent hole 41. In this embodiment, on the side of the gasket 53 in contact with the upper inner shell 12, there are two rings of annular protrusions 531, an inner ring of annular protrusions 531 and an outer ring of annular protrusions 531, so that the vent hole 41 is located between the two rings of annular protrusions 531 to improve the sealing performance when the gasket 53 seals the vent hole 41. In addition, when the guiding duct 42 is a through hole, the gasket 53 and the annular protrusions 531 also seal the guiding duct 42 together.

[0056] The current compressor housing generally has an outer shape close to a sphere, and the inner cavity contour of the housing is also close to a sphere. Various noises generated by the compressor core assembly and the like propagate outward and first reach the inner surface of the housing. Since the inner surface is close to a sphere, the sound waves propagating in all directions are vertically incident on the housing, and there is no effective refraction and sound absorption effect, and only the sound insulation effect of the housing can be relied on to reduce noise.

[0057] In the double-layer cavity sound-absorbing housing of this embodiment, the upper inner shell 12 forms a plurality of protrusions 121 and recesses 122 on the side towards the second cavity 32. More specifically, the outer contours of the protrusions 121 and recesses 122 are stepped. The protrusions 121 and recesses 122 are combined to form a plurality of angular wedge-like structures. 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. The angular wedge-like structures can refract the noise multiple times and gradually attenuate the noise, realizing refraction and sound absorption to reduce noise.

[0058] A compressor includes a core assembly 6, and the compressor is provided with the above-mentioned vacuum-sealed double-layer noise-reducing housing, and the core assembly 6 is located inside the second cavity 32.

[0059] A method for evacuating a compressor evacuates the above-mentioned compressor, and the method includes the following steps:

[0060] Place the compressor in a closed space, the second cavity 32 is communicated with the closed space, and the closed space is connected to a vacuum pumping device (such as a vacuum pump);

[0061] Start the vacuum pumping device to evacuate the closed space. The air pressure in the second cavity 32 first decreases, so that the air pressure in the second cavity 32 is less than the air pressure in the first cavity 31, and the one-way sealing assembly opens the vent hole 41 until the closed space (including the first cavity 31) is evacuated to a vacuum, and the one-way sealing assembly closes the vent hole 41 to keep the first cavity 31 in a vacuum state.

[0062] For the compressor vacuum pumping method of this embodiment, when evacuating the above-mentioned compressor, the compressor can be assembled to a terminal product (such as a refrigerator, etc.). When evacuating a part of the terminal product (such as the refrigeration system of the refrigerator), the first cavity 31 is evacuated together, so as to simplify the operation process of vacuum pumping and be more convenient and efficient.

[0063] So far, this embodiment has been described in detail with reference to the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the vacuum-sealed double-layer noise-reducing housing, compressor, and vacuum pumping method of the present invention. For the vacuum-sealed double-layer noise-reducing housing and compressor of the present invention, by setting the first cavity 31, the volume of the second cavity 32 is reduced, the cavity modal frequency of the second cavity 32 is increased, and the resonance of the lower peak frequency of the harmonic of the fundamental frequency near the cavity modal frequency is avoided, so as to reduce the cavity resonance noise; several protrusions 121 and depressions 122 are formed on the inner upper shell 12 towards the second cavity 32 to achieve refraction noise elimination; in addition to refraction noise elimination, the inner upper shell 12 continues to isolate sound, then vacuum sound insulation is carried out through the vacuum cavity (the first cavity 31), and finally sound insulation is carried out through the outer upper shell 11. In this way, under the five-fold action of reducing cavity resonance noise, refraction noise elimination, sound insulation of the inner upper shell 12, vacuum cavity sound insulation, and sound insulation of the outer upper shell 11, the compressor achieves a good noise reduction effect. For the compressor vacuum pumping method of the present invention, the first cavity 31 of the compressor can be evacuated conveniently and efficiently, and the first cavity 31 is kept in a vacuum state.

[0064] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vacuum-sealed double-layer noise-reducing housing, characterized in that: It includes an upper outer shell, an upper inner shell, a lower shell and a one-way sealing component; The upper inner shell is located inside the upper outer shell, the edge of the upper inner shell is sealingly 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 outer shell and / or the edge of the upper inner shell cooperate with the edge of the lower shell, and a second cavity is left between the upper inner shell and the lower shell; At least one ventilation hole is opened in the upper inner shell, and the ventilation hole communicates with the first cavity and the second cavity; The one-way sealing component is arranged on the upper inner shell. In the initial state, the one-way sealing component closes the ventilation hole; when the air pressure in the second cavity is less than the air pressure in the first cavity, under the action of the air pressure difference between the first cavity and the second cavity, the one-way sealing component opens the ventilation hole; Continuously evacuate the space where the second cavity is located to form a vacuum in the first cavity. The one-way sealing component closes the ventilation hole to keep the first cavity in a vacuum state.

2. The vacuum-sealed double-layer noise-reducing housing according to claim 1, characterized in that: A guiding channel is arranged on one side of the ventilation hole of the upper inner shell; The one-way sealing component includes a guiding rod, a support seat, a sealing pad, a spring and a fixing seat. The guiding rod is slidably connected in the guiding channel. A support seat is arranged at one end of the guiding rod located in the second cavity. A sealing pad is arranged on the inner end face of the support seat. A spring and a fixing seat are sequentially assembled at one end of the guiding rod located in the first cavity. One end of the spring is connected to the fixing seat, and the other end of the spring is connected to the upper inner shell; In the initial state of the one-way sealing component, under the elastic force of the spring, the sealing pad contacts the upper inner shell and closes the ventilation hole; when the air pressure in the second cavity is less than the air pressure in the first cavity, under the action of the air pressure difference between the first cavity and the second cavity, overcoming the elastic force of the spring, the sealing pad separates from the upper inner shell and opens the ventilation hole; after a vacuum is formed in the first cavity, under the elastic force of the spring, the sealing pad contacts the upper inner shell and closes the ventilation hole to keep the first cavity in a vacuum state.

3. The vacuum-sealed double-layer noise-reducing housing according to claim 2, characterized in that: At least one circle of annular protrusions is arranged on the side of the sealing pad in contact with the upper inner shell, and the annular protrusions surround the ventilation hole.

4. The vacuum-sealed double-layer noise-reducing housing according to claim 1, characterized in that: The upper inner shell forms a plurality of protrusions and depressions on the side of the second cavity.

5. The vacuum-sealed double-layer noise-reducing housing according to claim 4, characterized in that: The outer contours of the protrusions and the depressions are stepped.

6. The vacuum-sealed double-layer noise-reducing housing according to claim 1, characterized in that: The edge of the upper inner shell is in interference fit with the edge of the upper outer shell.

7. The vacuum-sealed double-layer noise-reducing housing according to claim 6, characterized in that: An annular notch is provided at the edge position of the lower shell, and the edge of the upper outer shell is fitted into the annular notch.

8. A vacuum-sealed double-layer noise-reducing housing according to claim 1, wherein: The upper outer shell and / or the upper inner shell are formed by a stamping process.

9. A compressor, comprising a core component, characterized in that: The compressor is provided with the vacuum-sealed double-layer noise-reducing housing according to any one of claims 1 to 8, and the movement assembly is located inside the second cavity.

10. A method for evacuating a compressor, which evacuates the compressor according to claim 9, characterized in that: The method comprises the following steps: Placing the compressor in a closed space, connecting the second cavity to the closed space, and connecting the closed space to a vacuum pumping device; Starting the vacuum pumping device to pump the closed space to a vacuum, making the air pressure in the second cavity less than the air pressure in the first cavity, and the one-way sealing assembly opening the vent hole until the closed space is pumped to a vacuum, and the one-way sealing assembly closing the vent hole to keep the first cavity in a vacuum state.

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