CN113757817B - Sound insulation structure, air condensing units and air conditioner - Google Patents
Sound insulation structure, air condensing units and air conditioner Download PDFInfo
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- CN113757817B CN113757817B CN202111230973.0A CN202111230973A CN113757817B CN 113757817 B CN113757817 B CN 113757817B CN 202111230973 A CN202111230973 A CN 202111230973A CN 113757817 B CN113757817 B CN 113757817B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/08—Compressors specially adapted for separate outdoor units
- F24F1/12—Vibration or noise prevention thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a sound insulation structure, an air conditioner outdoor unit and an air conditioner. The sound insulation structure comprises a body and a protruding structure, wherein the body is flaky and is provided with a first surface; a plurality of protruding structure intervals set up the first surface, every protruding structure all with be formed with the cavity between the body, it is a plurality of the cavity seals airtightly, protruding structure has and keeps away from the vibration face of first surface, the vibration face is used for producing the vibration when the sound wave propagates. The sound insulation structure is used for wrapping the periphery of a sound source such as a compressor, when sound waves generated by the sound source pass through the protruding structure, the vibration surface plays a role in vibration reduction and sound absorption through vibration, and the cavity has a certain sound insulation function.
Description
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to a sound insulation structure, an air conditioner outdoor unit and an air conditioner.
Background
The compressor is installed in the outdoor unit of the air conditioner, and the compressor generates medium and high frequency electromagnetic noise, mechanical noise, pneumatic noise and the like due to the acting force of the electromagnetic torque, the gas resistance torque and the like of the compressor, so that noise pollution is caused to the environment around the compressor. In the prior art, a felt fiber sound absorption material or a rubber sound insulation material or a composite material of the felt fiber sound absorption material and the rubber sound insulation material is usually adopted to wrap a compressor for sound insulation and noise reduction treatment. However, the existing sound insulation or absorption material has poor noise reduction effect on high-frequency noise in the compressor, and the requirement of an air conditioner product on the noise quality is difficult to meet.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the sound insulation structure which is used for wrapping the compressor of the air conditioner and has good sound insulation effect on high-frequency noise in the compressor.
The invention also provides an air conditioner outdoor unit and an air conditioner adopting the sound insulation structure.
A sound-insulating structure according to an embodiment of the first aspect of the present invention includes: the body is in a sheet shape and is provided with a first surface; a plurality of protruding structure intervals set up the first surface, every protruding structure all with be formed with the cavity between the body, it is a plurality of the cavity seals airtightly, protruding structure has and keeps away from the vibration face of first surface, the vibration face is used for producing the vibration when the sound wave propagates.
According to the sound insulation structure provided by the embodiment of the invention, at least the following beneficial effects are achieved: the sound insulation structure is used for wrapping the periphery of a sound source such as a compressor, when sound waves generated by the sound source pass through the protruding structure, the vibration surface plays a vibration and sound absorption function through vibration, and the cavity has a certain sound insulation function.
According to some embodiments of the invention, the volumes of at least two of the cavities are different.
According to some embodiments of the invention, at least two of the cavities are not in communication with each other.
According to some embodiments of the invention, the protruding structures are rectangular, and have a length a, a width b and a height h, wherein h is less than or equal to a and h is less than or equal to b.
According to some embodiments of the invention, a wall thickness of the vibration surface is less than or equal to 1mm.
According to some embodiments of the invention, the body further has a second surface facing away from the first surface, the second surface being a planar structure.
According to some embodiments of the invention, the sound insulating structure is made of plastic.
According to some embodiments of the invention, the sound insulation structure is formed in one step by using a plastic suction or blow molding process.
According to the air conditioner outdoor unit of the embodiment of the second aspect of the invention, the air conditioner outdoor unit comprises a compressor, a liquid storage device connected with the compressor and the sound insulation structure, the sound insulation structure encloses a sound insulation cavity, and the compressor and the liquid storage device are located in the sound insulation cavity.
The air conditioner outdoor unit provided by the embodiment of the invention at least has the following beneficial effects: the sound insulation structure wraps the periphery of the compressor, when sound waves generated by a sound source pass through the convex structure, the vibration surface plays a vibration damping and sound absorbing function through vibration, and the cavity has a certain sound insulation function.
An air conditioner according to an embodiment of the third aspect of the present invention includes the air conditioner outdoor unit described above.
The air conditioner provided by the embodiment of the invention at least has the following beneficial effects: the sound insulation structure wraps the periphery of a compressor of the air conditioner, when sound waves generated by a sound source pass through the protruding structure, the vibration surface plays a vibration damping and sound absorbing function through vibration, and the cavity has a certain sound insulation function.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described with reference to the following figures and examples, in which:
fig. 1 is a schematic plan view of a sound insulating structure according to an embodiment of the present invention;
FIG. 2 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 1;
fig. 3 is a schematic view of vibration of a projection structure of a sound-insulating structure according to an embodiment of the present invention;
FIG. 4 is a schematic view of an assembly of a sound insulating structure and a compressor according to an embodiment of the present invention;
FIG. 5 is a comparison of the test spectrum of a white noise source before and after installation of a sound insulating structure according to an embodiment of the present invention.
Reference numerals:
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation descriptions referred to, for example, the left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that the device or element referred to must have a specific orientation, be constructed in a specific orientation and operation, and thus should not be construed as limiting the present invention.
In the description of the present invention, if there are first and second described only for the purpose of distinguishing technical features, it is not understood that relative importance is indicated or implied or that the number of indicated technical features or the precedence of the indicated technical features is implicitly indicated or implied.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
The compressor is installed in the outdoor unit of the air conditioner, and the acting force such as electromagnetic torque, gas resistance torque and the like of the compressor can cause the compressor to generate medium-high frequency electromagnetic noise, mechanical noise, pneumatic noise and the like, so that noise pollution is caused to the environment around the compressor, and the user experience is influenced. In the prior art, a felt fiber sound absorption material or a rubber sound insulation material or a composite material of the felt fiber sound absorption material and the rubber sound insulation material are used for wrapping a compressor to perform sound insulation and noise reduction treatment. The existing sound insulation or absorption material has poor noise reduction effect on medium-high frequency noise with the frequency of a compressor above 630Hz, and is difficult to meet the requirement of air-conditioning products on the noise quality. Moreover, the frequency band of the traditional sound absorption cotton material is usually above 1000Hz, and the sound absorption effect below 1000Hz is not good. In addition, the environment-friendly sound absorption and insulation material is expensive and has low cost performance.
Accordingly, the present invention provides a sound insulation structure 100 having a good noise reduction effect to reduce noise pollution of a compressor 200 of an outdoor unit of an air conditioner.
The following describes a technical solution of the sound insulation structure 100 of the present invention with reference to fig. 1 to 5, so as to illustrate the noise reduction principle and effect of the sound insulation structure 100 of the embodiment of the present invention on medium and high frequency noise with a frequency above 630 Hz.
Referring to fig. 1, 2 and 3, a specific embodiment of the sound insulation structure 100 of the present invention is disclosed, as shown in fig. 1 and 2, the sound insulation structure 100 includes a body 110 and a protruding structure 120, wherein the body 110 may be made of a sound insulation material with a good sound insulation function, and the body 110 is configured in a sheet shape, so that the sound insulation structure 100 can wrap a sound source, such as a compressor 200, to insulate the sound source. The body 110 has a first surface 111 and a second surface 112, and when the sound insulation structure 100 is assembled around a sound source, the sound insulation structure 100 is used for wrapping the sound source, wherein the first surface 111 is the surface of the body 110 facing away from the sound source, and the second surface 112 is the surface of the body 110 close to the sound source, that is, the first surface 111 and the second surface 112 face away from each other.
The plurality of protruding structures 120 are arranged at intervals, the protruding structures 120 cover the whole first surface 111 as much as possible, a cavity 121 is formed between each protruding structure 120 and the body 110, the protruding structures 120 have a vibration surface 122 far away from the first surface 111, and the vibration surface 122 has a predetermined surface area.
Referring to fig. 2 and 3, the plurality of cavities 121 are hermetically sealed, and air or inert gas is filled in the cavities 121, so that when sound waves generated by a sound source pass through the protrusion structures 120, the air or inert gas in the cavities 121 is oscillated, which causes the vibration surfaces 122 of the protrusion structures 120 to vibrate, thereby achieving sound absorption through the vibration of the vibration surfaces 122, and the cavities 121 between the body 110 and the protrusion structures 120 function as sound insulation cavities. Therefore, the sound insulation and sound absorption noise reduction modes are organically combined, so that the noise generated by a sound source is reduced.
Therefore, according to the sound insulation structure 100 of the embodiment of the invention, the protruding structure 120 is arranged on the surface of the body 110, the cavity 121 is formed between the protruding structure 120 and the body 110, the sound insulation structure 100 is wrapped on the periphery of a sound source such as the compressor 200, when the sound wave generated by the sound source passes through the protruding structure 120, the vibration surface 122 plays a role in vibration reduction and sound absorption through vibration, and the cavity has a certain sound insulation function.
It should be noted that, from the perspective of sound insulation and noise reduction, when the sound insulation effect of the material itself for manufacturing the body 110 is limited, experiments show that, in order to ensure the sound insulation effect of the sound insulation structure 100, when the projection area of the projection structure 120 on the first surface 111 of the body 110 is more than 50% of the area of the first surface 111, the sound insulation structure 100 can achieve a predetermined sound insulation effect. Thus, in order to ensure the sound insulation effect of the sound insulation structure 100, the protruding structures 120 should be disposed as densely as possible on the first surface 111 of the body 110.
After the sound insulation structure 100 is manufactured, each protruding structure 120 is shaped, the volume of the cavity 121 is fixed, the cavity 121 with the preset volume has a good noise reduction effect on noise in a certain frequency band, and the noise reduction effect on noise in other frequency bands is not ideal. Therefore, it can be understood that, referring to fig. 2, in some embodiments, the volumes of the cavities 121 formed between the plurality of protruding structures 120 and the body 110 are varied, that is, the volumes of at least two cavities 121 are different, and the resonant frequencies corresponding to the cavities 121 are different, so that the sound absorption and noise reduction effects of the cavities 121 on sound waves in different frequency bands are different, thereby achieving the purpose of reducing noise of noise in a wider frequency band.
It is understood that the volumes of the plurality of cavities 121 are all set to be different in order to reduce noise of a noise source in a wide frequency band.
It can be understood that, referring to fig. 2, in some embodiments, the cavities 121 are not communicated with each other, the cavities 121 that are not communicated with each other form independent vibration reduction cavities, and the volumes of at least two cavities 121 are different, so that the sound insulation structure 100 has a sound insulation effect in a wider frequency band, and a purpose of reducing noise in the wider frequency band is achieved.
It should be noted that, in order to make the volumes of the cavities 121 different, in some embodiments, two or more adjacent cavities 121 are communicated with each other, so that the two or more adjacent cavities 121 form a vibration damping cavity with a volume larger than that of another single cavity 121, and the sound insulation structure 100 can also have a sound insulation effect in a wider frequency band, so as to achieve the purpose of reducing noise in the wider frequency band.
The plurality of cavities 121 may be hermetically sealed, each cavity 121 may be independently hermetically sealed, or two or more adjacent cavities 121 may be hermetically sealed after being communicated with each other, which is not limited herein.
It is understood that, referring to fig. 1 and 2, in some embodiments, the protruding structure 120 is square, and the length of the square protruding structure 120 is a, the width of the square protruding structure is b, and the height of the square protruding structure 120 is h, where h is less than or equal to a and h is less than or equal to b, and the protruding structure 120 is square, mainly from the viewpoint of processing, so as to facilitate the manufacturing of the sound insulation structure 100 and reduce the processing difficulty of the sound insulation structure 100.
It is understood that the protrusion structure 120 may be configured in other shapes, such as a cylinder shape, a truncated cone shape, a prism shape, etc., as long as the top of the protrusion structure 120 has the vibration surface 122 with a predetermined surface area, so that when the sound wave generated by the sound source passes through the protrusion structure 120, the air or inert gas in the cavity 121 is oscillated, and the vibration surface 122 of the protrusion structure 120 is further caused to vibrate, thereby achieving the purpose of sound absorption through the vibration of the vibration surface 122, and reducing the noise generated by the sound source.
It is understood that in some embodiments, the wall thickness of the vibration surface 122 is less than or equal to 1mm, so that when sound waves emitted from the sound source pass through the protruding structure 120, the air or inert gas in the cavity 121 is oscillated, and the oscillated air or inert gas can generate larger vibration on the vibration surface 122 with a thickness of less than or equal to 1mm, thereby improving the noise reduction effect of the sound insulation structure 100.
Referring to fig. 2 and 3, it can be appreciated that the second surface 112 of the body 110 is provided as a planar structure, thereby facilitating the sound-proof structure 100 to enclose a sound source, such as a compressor 200.
It can be understood that, in some embodiments, the sound insulation structure 100 is made of PP plastic or other plastic with a certain sound insulation effect, and when the PP plastic is adopted, the sound insulation structure can be formed in one step by adopting a plastic suction or blow molding process, so that the sound insulation structure 100 can be conveniently processed and manufactured, the processing difficulty of the sound insulation structure 100 is reduced, and the PP plastic is low in price, so that the manufacturing cost of the sound insulation structure 100 is low.
It can be understood that sound insulation structure 100 can also adopt split type structure, if sound insulation structure 100's body 110 can also adopt the better closely knit material preparation of sound insulation effect to form, protruding structure 120 adopts the better material preparation of pliability, body 110 and protruding structure 120 assembly after will dividing the body preparation again are in the same place, because sound insulation structure 100's body 110 self has better sound insulation function, thereby make sound insulation structure 100 with sound insulation and damping sound absorption organic combination together, further promote sound insulation structure 100's noise reduction effect.
Referring to fig. 5, fig. 5 is a comparison graph of test frequency spectrums before and after a white noise source is subjected to sound insulation processing by using the sound insulation structure 100 according to an embodiment of the present invention, where the left side of each frequency spectrum in the graph corresponds to a noise decibel value of the white noise source, and the right side corresponds to a noise decibel value after the sound insulation structure 100 according to the embodiment of the present invention is used.
In this test, the sound source was a white noise source, which is noise with a power spectral density that is constant over the entire frequency domain. Random noise with the same energy density at all frequencies is called white noise.
White noise is noise having a noise power spectral density equal to that included in a frequency band of equal bandwidth in a wide frequency range. It is typically physically translated into white noise (white noise).
White noise, or white noise, is a random signal with a constant power spectral density. In other words, the power spectral density of the signal is the same in each frequency band, and since white light is a mixture of monochromatic lights of various frequencies (colors), the signal is said to have a flat power spectrum and is called white, and the signal is also called white noise. In contrast, other noise signals that do not have this property are referred to as colored noise.
Ideally white noise has infinite bandwidth and thus infinite energy, but this is not possible in the real world. In fact, we often consider a flat signal of limited bandwidth as white noise, as this makes us more convenient in mathematical analysis. White noise is convenient in mathematical processing, so it is a powerful tool for system analysis.
As can be seen from the test spectrogram in fig. 5, after the sound insulation structure 100 of the present invention is used to perform sound insulation treatment on a white noise source, the noise reduction range of the sound insulation structure 100 of the present invention to the medium and high frequency noise with the frequency above 630Hz in the white noise source is about 5 to 15 db, so that the sound insulation structure has a better noise reduction effect. Therefore, compared with the existing sound insulation material, the sound insulation structure provided by the embodiment of the invention has a good noise reduction effect on medium-high frequency noise with the frequency of above 630Hz, and for the traditional sound absorption cotton sound absorption material, the noise reduction frequency of the embodiment of the invention is reduced to 630Hz, namely, the sound insulation structure provided by the embodiment of the invention has a good noise reduction effect on noise with the frequency of 630Hz to 1000Hz, so that the requirement of an air conditioner product on the noise quality can be met.
Referring to fig. 4, an outdoor unit of an air conditioner according to a second aspect of the present invention includes a compressor 200, a liquid storage device 210, and the sound insulation structure 100 of any of the above embodiments, wherein the liquid storage device 210 is connected to the compressor 200, and the sound insulation structure 100 is enclosed to form a sound insulation chamber, so as to enclose the compressor 200 and the liquid storage device 210 in the sound insulation chamber. Because the raised structure 120 is arranged on the surface of the body 110, the cavity 121 is formed between the raised structure 120 and the body 110, the sound insulation structure 100 is wrapped on the periphery of the compressor 200, the cavity 121 has a sound insulation function, and the vibration surface 122 plays a role in vibration reduction and sound absorption through vibration, therefore, the sound insulation and sound absorption modes are organically combined, the medium-high frequency noise of the compressor 200 with the noise frequency above 630Hz can be effectively reduced, the pollution of the noise to the environment is reduced, the comfort of the air conditioner in the use process is improved, and the user experience is improved; and the sound insulation structure 100 is low in price, so that the cost of the air conditioner can be reduced while the sound quality of the air conditioner is improved.
An air conditioner according to an embodiment of a third aspect of the present invention includes the outdoor unit of an air conditioner described above. Because the raised structure 120 is arranged on the surface of the body 110, the cavity 121 is formed between the raised structure 120 and the body 110, the sound insulation structure 100 is wrapped on the periphery of the compressor 200 of the air conditioner, the cavity 121 has a sound insulation function, and the vibration surface 122 plays a role in vibration reduction and sound absorption through vibration, therefore, the invention organically combines sound insulation and sound absorption modes for reducing noise, can effectively reduce medium-high frequency noise of the compressor 200 with the noise frequency above 630Hz, reduces the pollution of the noise to the environment, improves the comfort of the air conditioner in the using process, and improves the user experience; and the sound insulation structure 100 is low in price, so that the cost of the air conditioner can be reduced while the sound quality of the air conditioner is improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The present invention is not limited to the above-described embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.
Claims (8)
1. A sound insulating structure, comprising:
the body is flaky and is provided with a first surface;
the protruding structures are arranged on the first surface at intervals, a cavity is formed between each protruding structure and the body, the cavities are hermetically sealed, and the protruding structures are provided with vibrating surfaces far away from the first surface and used for generating vibration when sound waves are transmitted; the volumes of at least two cavities are different, at least two adjacent cavities are communicated with each other, and at least two cavities are not communicated with each other; when the sound insulation structure is used, the first surface is configured to be closer to a sound source than the vibration surface.
2. The sound insulation structure of claim 1, wherein the protruding structure is a rectangular body having a length a, a width b, and a height h, wherein h is ≦ a and h is ≦ b.
3. A sound-insulating structure according to claim 1, characterized in that the wall thickness of the vibrating surface is less than or equal to 1mm.
4. The sound-insulating structure of claim 1, wherein the body further has a second surface facing away from the first surface, the second surface being a planar structure.
5. A sound-insulating structure according to any one of claims 1 to 4, characterised in that it is made of plastic.
6. The sound insulation structure of claim 5, wherein the sound insulation structure is formed in one step by a plastic suction or blow molding process.
7. An outdoor unit of an air conditioner, comprising:
a compressor;
the liquid storage device is connected with the compressor;
and a sound-insulating structure as claimed in any one of claims 1 to 6 enclosing a sound-insulating chamber in which the compressor and the reservoir are located.
8. An air conditioner comprising the outdoor unit of claim 7.
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| CN202111230973.0A CN113757817B (en) | 2021-10-22 | 2021-10-22 | Sound insulation structure, air condensing units and air conditioner |
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| CN202111230973.0A CN113757817B (en) | 2021-10-22 | 2021-10-22 | Sound insulation structure, air condensing units and air conditioner |
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| CN113757817A CN113757817A (en) | 2021-12-07 |
| CN113757817B true CN113757817B (en) | 2022-11-29 |
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Citations (7)
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|---|---|---|---|---|
| DE2758041A1 (en) * | 1977-12-24 | 1979-06-28 | Fraunhofer Ges Forschung | Sound-damping laminate used as wall-covering - made of polyethylene sheet with noise-absorbing depressions sealed by smooth covering polystyrene foil |
| JPS6327242A (en) * | 1986-05-16 | 1988-02-04 | マテクホ−ルデイング ア−ゲ− | Structural element absorbing airborne sound and manufacture thereof |
| DE4334984C1 (en) * | 1993-10-14 | 1995-01-19 | Freudenberg Carl Fa | Sound-absorbing moulding |
| EP0666806A1 (en) * | 1992-11-07 | 1995-08-16 | Helmut Pelzer | Moulded article designed to absorb airborne sound. |
| KR19980052875U (en) * | 1996-12-31 | 1998-10-07 | 김광호 | Noise control device of air conditioner |
| CN106012880A (en) * | 2016-06-29 | 2016-10-12 | 广州睿成信息科技有限公司 | Inflation-adjustable sound barrier |
| CN210772498U (en) * | 2019-08-12 | 2020-06-16 | 珠海格力电器股份有限公司 | Sound-proof housing, compressor unit spare and have its air conditioner |
-
2021
- 2021-10-22 CN CN202111230973.0A patent/CN113757817B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2758041A1 (en) * | 1977-12-24 | 1979-06-28 | Fraunhofer Ges Forschung | Sound-damping laminate used as wall-covering - made of polyethylene sheet with noise-absorbing depressions sealed by smooth covering polystyrene foil |
| JPS6327242A (en) * | 1986-05-16 | 1988-02-04 | マテクホ−ルデイング ア−ゲ− | Structural element absorbing airborne sound and manufacture thereof |
| EP0666806A1 (en) * | 1992-11-07 | 1995-08-16 | Helmut Pelzer | Moulded article designed to absorb airborne sound. |
| DE4334984C1 (en) * | 1993-10-14 | 1995-01-19 | Freudenberg Carl Fa | Sound-absorbing moulding |
| KR19980052875U (en) * | 1996-12-31 | 1998-10-07 | 김광호 | Noise control device of air conditioner |
| CN106012880A (en) * | 2016-06-29 | 2016-10-12 | 广州睿成信息科技有限公司 | Inflation-adjustable sound barrier |
| CN210772498U (en) * | 2019-08-12 | 2020-06-16 | 珠海格力电器股份有限公司 | Sound-proof housing, compressor unit spare and have its air conditioner |
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| CN113757817A (en) | 2021-12-07 |
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