Soundproof cover, control method and compressor

Abstract

The application provides a soundproof cover, a control method and a compressor. The soundproof cover comprises a cover body and a unit cell for noise reduction. The inner wall of the cover body is arranged with a plurality of unit cells. The cover body has a containing cavity for placing a noise source. The unit cell comprises a mounting frame and an elastic membrane. The mounting frame has a cavity. The side wall of the elastic membrane is connected with the inner wall of the mounting frame. A first cavity chamber faces the containing cavity. A second cavity chamber forms a soundproof chamber with the inner wall of the cover body. A mass is arranged on the side of the elastic membrane facing the containing cavity. The pre-tightening force of the elastic membrane is adjustably arranged. Since the inner wall of the cover body is arranged with a plurality of unit cells and the pre-tightening force of the elastic membrane can be adjusted, the soundproof cover can effectively reduce noise with different peak frequencies, thereby meeting the requirement of effectively reducing noise of the noise source under different operating frequencies.

Description

Technical Field

[0001] This invention belongs to the field of compressor technology, specifically relating to a soundproof cover, a control method, and a compressor. Background Technology

[0002] Air conditioner outdoor units contain a fan and compressor system, which inevitably generate noise. The compressor is the primary noise source. Besides radiating noise itself, its vibrations are transmitted through foot pads and piping to the sheet metal parts of the outdoor unit casing. These thin-walled sheet metal parts further radiate noise. Currently, sound insulation cotton is typically used to wrap the compressor to prevent noise transmission; counterweights are placed on the piping to suppress vibration transmission. However, these methods are ineffective and cannot meet the noise control requirements of air conditioning products.

[0003] Related technologies disclose a noise reduction device and a compressor noise reduction system. The noise reduction device includes noise reduction holes and a silencing channel. The noise reduction holes are installed on the side wall of the inner shell, and their cross-sectional area gradually decreases. The noise reduction holes are connected to the silencing channel for further noise reduction. This solution achieves better noise reduction through multi-stage noise reduction. However, this noise reduction device consists of a noise reduction inner shell, a noise reduction outer shell, noise reduction holes, and a noise reduction channel, resulting in a complex and thick structure, and its noise reduction effect is only effective within a specific frequency range. Related technologies also disclose a compressor noise reduction structure and an air conditioner. This compressor noise reduction structure includes a noise reduction shell and an elastic base pad. The noise reduction shell includes a rigid sound insulation shell and an internal sound-absorbing structure. The elastic base pad is located below the rigid sound insulation base, and the lower opening of the rigid sound insulation cover is fixedly connected to the elastic base pad. A vibration isolation gap is provided between the rigid sound insulation base and the lower opening of the rigid sound insulation cover. This solution reduces the noise of the compressor by absorbing the noise generated by the compressor and blocking the noise propagation path. However, this solution results in the same sound absorption effect in all directions of the compressor and fails to reduce the radiated noise from sheet metal parts. Summary of the Invention

[0004] This invention provides a soundproof enclosure, a control method, and a compressor, which can solve the technical problem that existing noise reduction structures only have a noise reduction effect on noise within a specific frequency range and cannot effectively reduce noise at different peak frequencies.

[0005] This invention provides a soundproof enclosure, which includes an enclosure body and unit cells for noise reduction:

[0006] The inner wall of the cover is arranged with multiple unit cells, and the cover has a cavity for accommodating noise source components;

[0007] The unit cell includes a mounting frame and an elastic membrane. The mounting frame is connected to the inner wall of the cover and has a cavity. The side wall of the elastic membrane is connected to the inner wall of the mounting frame. The elastic membrane divides the cavity into a first chamber and a second chamber, which are independent of each other. The first chamber faces the receiving cavity, and the second chamber forms a soundproof chamber between itself and the inner wall of the cover. A mass block is provided on the side of the elastic membrane facing the receiving cavity, and the preload of the elastic membrane is adjustable.

[0008] In some embodiments, the cavity has multiple sub-cavities, each of which is provided with the elastic membrane, and each sub-cavity is divided by the elastic membrane into an independent first chamber and a second chamber.

[0009] In some embodiments, the cavity has a first sub-cavity, a second sub-cavity, and a third sub-cavity that are independent of each other. Each of the first sub-cavity, the second sub-cavity, and the third sub-cavity is provided with an elastic membrane. Each of the first sub-cavity, the second sub-cavity, and the third sub-cavity is divided into a first chamber and a second chamber by a corresponding elastic membrane, and the volume of the first sub-cavity, the second sub-cavity, and the third sub-cavity decreases sequentially.

[0010] In some embodiments, the mass blocks are provided on the elastic membranes corresponding to the first sub-cavity, the second sub-cavity, and the third sub-cavity, and the mass blocks decrease in mass sequentially.

[0011] In some embodiments, the mounting frame includes a first side plate, a second side plate, a third side plate, and a fourth side plate that are connected in an enclosing manner. With the inner wall of the cover as the projection plane, the first side plate and the third side plate are arranged parallel to each other, and the second side plate and the fourth side plate are arranged parallel to each other.

[0012] It also includes a first partition and a second partition. The first partition is arranged parallel to the second side plate and the fourth side plate. The two sides of the first partition are perpendicularly connected to the first side plate and the third side plate, respectively. The second partition is arranged parallel to the first side plate and the third side plate. One side wall of the second partition is connected to the first partition, and the other side wall of the second partition is connected to the fourth side plate. The first partition and the second partition divide the cavity into a first sub-cavity, a second sub-cavity, and a third sub-cavity.

[0013] In some embodiments, a first electromagnetic coil is provided on the inner wall of the cover, and a second electromagnetic coil is provided on the side of the elastic membrane facing the inner wall of the cover. The first electromagnetic coil and the second electromagnetic coil are arranged opposite to each other, and there is a current change between the first electromagnetic coil and the second electromagnetic coil to adjust the preload of the elastic membrane.

[0014] In some embodiments, the cover includes an outer shell and a damping layer, the outer wall of the outer shell being provided with the damping layer, and the mounting frame being connected to the inner wall of the outer shell.

[0015] A control method for controlling the aforementioned soundproof enclosure, wherein a first electromagnetic coil is disposed on the inner wall of the enclosure, and a second electromagnetic coil is disposed on the side of the elastic membrane facing the inner wall of the enclosure, the control method includes:

[0016] The operating frequency of the noise source is obtained, and the operating frequency of the noise source is a first frequency. When the first frequency is obtained from the database, the first electrical signal value corresponding to each unit cell is adjusted to the first electrical signal value.

[0017] The operating frequency of the noise source device is continuously acquired. If the operating frequency of the noise source device remains unchanged, the first electrical signal value of the unit cell remains unchanged. If the operating frequency of the noise source device changes, the electrical signal value of each unit cell corresponding to the operating frequency is reacquired from the database according to the operating frequency of the noise source device.

[0018] In some embodiments, when the cavity has independent first sub-cavities, second sub-cavities, and third sub-cavities, and the elastic membrane is respectively disposed in the first sub-cavity, the second sub-cavity, and the third sub-cavity, and a second electromagnetic coil is disposed on the side of the elastic membrane in each sub-cavity facing the inner wall of the cover, and a first electromagnetic coil is disposed on the inner wall of the cover corresponding to each sub-cavity, the step of establishing the database includes:

[0019] By establishing monitoring points at the center coordinates of each unit cell, the noise frequency response curve of each unit cell when receiving noise is obtained;

[0020] Using the electrical signals of the first and second electromagnetic coils in the first, second, and third sub-cavities of each unit cell as variables, and with the noise value after noise reduction of the unit cell as the minimum target, the electrical signal values ​​in each sub-cavity of the noise source at different frequencies are obtained, forming the database.

[0021] A compressor is provided with a soundproof cover, the compressor being a noise source, and the soundproof cover being the aforementioned soundproof cover.

[0022] The soundproof enclosure, control method, and compressor provided by this invention have the following beneficial effects:

[0023] Because the inner wall of the enclosure is equipped with multiple unit cells, which, combined with noise sources, will generate noise of varying degrees, and sound waves propagate in multiple directions, this invention arranges multiple unit cells on the inner wall of the enclosure to maximize the absorption of sound waves from different directions. The preload of the elastic membrane can be adjusted, and the elastic membrane provides a certain supporting force to the mass block. This allows for effective noise reduction at different peak frequencies, thus satisfying the requirement for effective noise reduction at different operating frequencies of the noise sources. In this way, each unit cell can flexibly adjust its vibration absorption range for different noise peak frequencies. Attached Figure Description

[0024] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a soundproof cover according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram showing that the inner wall of the cover body of this invention is arranged with multiple unit cells;

[0027] Figure 3 This is a schematic diagram of a unit cell according to an embodiment of the present invention;

[0028] Figure 4 This is an explosion image of a single cell according to an embodiment of the present invention;

[0029] Figure 5 This is a logic flowchart of the control method according to an embodiment of the present invention;

[0030] Figure 6 This is a logical flowchart of the database in an embodiment of the present invention;

[0031] Figure 7 A comparison chart showing the impact of damping layers on radiated noise of sheet metal parts;

[0032] Figure 8 To compare the changes in the sound absorption coefficient of the unit cell of the first and second electromagnetic coils.

[0033] Attached Figures: 1-Cover; 101-Outer Shell; 102-Damping Layer; 2-Unit Cell; 201-Mounting Frame; 211-First Side Plate; 212-Second Side Plate; 213-Third Side Plate; 214-Fourth Side Plate; 215-First Partition; 216-Second Partition; 202-Elastic Membrane; 203-First Chamber; 204-Mass Block; 251-First Sub-Cavity; 252-Second Sub-Cavity; 253-Third Sub-Cavity; 31-First Electromagnetic Coil; 32-Second Electromagnetic Coil; 4-Noise Source Component; 5-Outdoor Unit Cover. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0036] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0037] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0038] See also Figure 1 and Figure 2 As shown, according to an embodiment of the present invention, a soundproof cover is provided, which includes a cover body 1 and unit cells 2 for noise reduction: a plurality of unit cells 2 are arranged on the inner wall of the cover body 1, and the cover body 1 has a receiving cavity for placing a noise source 4; the unit cell 2 includes a mounting frame 201 and an elastic membrane 202, the mounting frame 201 is connected to the inner wall of the cover body 1, and the mounting frame 201 has a cavity; the side wall of the elastic membrane 202 is connected to the inner wall of the mounting frame 201, and the elastic membrane 202 divides the cavity into a first chamber 203 and a second chamber that are independent of each other, the first chamber 203 faces the receiving cavity, and the second chamber forms a soundproof cavity between the second chamber and the inner wall of the cover body 1, a mass block 204 is provided on the side of the elastic membrane 202 facing the receiving cavity, and the preload of the elastic membrane 202 is adjustable.

[0039] Specifically, the cover 1 is placed over the noise source 4. The noise source 4 operates at a certain frequency and generates noise during operation. The noise is transmitted in the form of sound waves to the surroundings. The sound waves are transmitted to each unit cell 2. Each unit cell 2 has a corresponding elastic membrane 202 with a mass block 204. When the sound wave resonates with the mass block 204, the vibrating mass block 204 consumes the sound wave energy, thereby achieving noise reduction. If the operating frequency of the noise source 4 changes, the noise generated by the noise source 4 will increase or decrease. The preload of the elastic membrane 202 can be adjusted according to the operating frequency of the noise source 4. If the preload of the elastic membrane 202 decreases, the elasticity of the elastic membrane 202 increases, and the mass block 204 can vibrate more significantly, consuming more sound wave energy. If the preload of the elastic membrane 202 increases, the elasticity of the elastic membrane 202 decreases, and the vibration amplitude of the mass block 204 decreases, consuming less sound wave energy.

[0040] In this embodiment, since the inner wall of the enclosure 1 is provided with multiple unit cells 2, combined with the noise source 4, different levels of noise will be generated, and the sound waves are transmitted in multiple directions. In this embodiment, multiple unit cells 2 are arranged on the inner wall of the enclosure 1, which can absorb sound waves in different directions to the greatest extent. The preload of the elastic membrane 202 can be adjusted, and the elastic membrane 202 provides a certain support force to the mass block 204. It can effectively reduce noise at different peak frequencies according to the soundproof enclosure, thus meeting the requirement of effective noise reduction at different operating frequencies of the noise source 4. In this way, the sound absorption range of each unit cell 2 can be flexibly adjusted for different peak frequencies.

[0041] As a specific implementation, when the noise source 4 is a compressor, the compressor can operate at different frequencies. In addition to the noise generated by the compressor itself, the related pipelines connected to the compressor will also generate noise. In this embodiment, the noise source 4 can also be a pipeline connected to the compressor.

[0042] See also Figure 2 and Figure 3 As shown, the cavity has multiple sub-cavities, each of which is equipped with an elastic membrane 202. Each sub-cavity is divided into an independent first chamber 203 and a second chamber by the elastic membrane 202. Specifically, the volumes of the sub-cavities can be the same or different.

[0043] Specifically, each sub-cavity is equipped with an elastic membrane 202. When sound waves are transmitted to each unit cell 2, a mass block 204 is provided on the corresponding elastic membrane 202 of each sub-cavity. When the sound wave resonates with the mass block 204, the vibrating mass block 204 consumes the sound wave energy, thereby achieving noise reduction. When the volumes of each sub-cavity are the same, each sub-cavity can reduce noise for the same peak value. When the volumes of each sub-cavity are different, since the peak values ​​of the sound waves transmitted to each unit cell 2 are different, each sub-cavity can target multiple noise reduction peak values.

[0044] In this embodiment, compared to the mounting frame 201 having only one cavity, this embodiment divides the cavity into multiple sub-cavities, so that multiple noise reduction peaks exist in each unit cell 2 at the same time. Even if the sound wave peaks transmitted from different directions of the cover 1 are different, noise reduction can still be performed, thereby achieving a wideband noise reduction effect.

[0045] See also Figure 3 and Figure 4 As shown, the cavity has a first sub-cavity 251, a second sub-cavity 252, and a third sub-cavity 253 that are independent of each other. Each of the first sub-cavity 251, the second sub-cavity 252, and the third sub-cavity 253 is provided with an elastic membrane 202. Each of the first sub-cavity 251, the second sub-cavity 252, and the third sub-cavity 253 is divided into a first chamber 203 and a second chamber that are independent of each other by the corresponding elastic membrane 202, and the volume of the first sub-cavity 251, the second sub-cavity 252, and the third sub-cavity 253 decreases in sequence.

[0046] Specifically, when the cavity consists of three independent sub-cavities, the first sub-cavity 251 can reduce high-frequency noise from the noise source 4, the second sub-cavity 252 can reduce mid-frequency noise from the noise source 4, and the third sub-cavity 253 can reduce low-frequency noise. With this configuration, even if the noise peak transmitted by the noise source 4 to the surroundings is different, noise reduction can be achieved to the greatest extent. Furthermore, since each sub-cavity is equipped with an elastic membrane 202, the preload of the elastic membrane 202 in each sub-cavity can be adjusted to address the directional nature of noise transmission from the noise source 4.

[0047] In this embodiment, the volumes of the various sub-cavities are different. The larger the volume of a sub-cavity, the larger the size of the elastic membrane 202. This allows each unit cell 2 of the soundproof enclosure to simultaneously have multiple noise reduction peaks. Even if the noise frequency transmitted to a single cell is the same, the noise reduction frequency bands of the three sub-cavities in each unit cell 2 are different. Adjusting the preload of the elastic membrane 202 in each sub-cavity broadens the noise reduction frequency band. It is worth noting that in this embodiment, the optimal configuration is three sub-cavities. In other embodiments, two or more sub-cavities can be configured according to noise reduction requirements.

[0048] See also Figure 3 and Figure 4 As shown, each of the elastic membranes 202 corresponding to the first sub-cavity 251, the second sub-cavity 252, and the third sub-cavity 253 is provided with a mass block 204, and the mass of the mass block 204 decreases sequentially.

[0049] Specifically, since the volumes of the first sub-cavity 251, the second sub-cavity 252, and the third sub-cavity 253 are different, the sizes of the elastic membranes 202 in the first sub-cavity 251, the second sub-cavity 252, and the third sub-cavity 253 are also different. In order to make the mass block 204 resonate with the sound wave, the mass of the mass block 204 in the first sub-cavity 251, the second sub-cavity 252, and the third sub-cavity 253 decreases sequentially in this embodiment. The three sets of mass blocks 204 in each unit cell 2 can be adjusted independently. For the three obvious peak frequencies that need noise reduction, the three sub-cavities can be adjusted to the corresponding noise reduction peak frequencies for effective noise reduction. Since noise transmission is directional, even if the frequency of the noise source 4 is the same, the relative magnitude of the noise peaks in different directions will be different. In this embodiment, the preload of the elastic membrane 202 and the size of the mass block 204 can be flexibly adjusted, thereby adjusting the resonant frequency of each cavity to achieve noise reduction effects at different frequencies.

[0050] It is worth noting that, in conjunction with [see also] Figure 8The three distinct peak frequencies are the three largest peak frequencies in the noise spectrum of the compressor during operation, between 50-500Hz. Adjustment Case 1 involves increasing the tension of the elastic diaphragm 202 in the largest of the three sub-chambers; Adjustment Case 2 involves increasing the tension of the elastic diaphragm 202 in all three sub-chambers. In this embodiment, the three sub-chambers can be adjusted independently, but they do not necessarily have to be adjusted to be the same. It can be seen that for different operating frequencies of the noise source 4, this embodiment can adjust the preload of the elastic diaphragm in each sub-chamber individually to obtain different sound absorption coefficients and produce different degrees of sound absorption effects.

[0051] As a specific implementation, the unit cell 2, equipped with a soundproof chamber and mass block 204, operates on the principle that the mass block 204 and the elastic membrane 202 possess abundant resonant modes at low frequencies. After sound waves are incident, the modes of the elastic membrane 202 are difficult to couple with the traveling wave in the direction of the sound wave. At this point, the elastic membrane 202 with the added mass block 204 couples and resonates with the air inside the chamber, dissipating the energy of the incident sound waves, thereby achieving a soundproofing effect. The relationship between M and the corresponding resonant frequency f of each mass block 204 is as follows: Where α is a constant, a mass block 204 is added to the elastic membrane 202. The elastic membrane 202 and the mass block 204 have few modes. To increase the number of structural modes, mass blocks 204 of equal size are symmetrically attached to the elastic membrane 202 in each cavity. The elastic membrane 202 can be made of silicone rubber film, and the mass block 204 can be made of steel.

[0052] In one specific implementation, this embodiment provides two mass blocks 204 on each elastic membrane 202. The mass size of the two mass blocks 204 can be the same or different. In a preferred embodiment, the mass size of the two mass blocks 204 is the same and they are symmetrically arranged on the elastic membrane 202.

[0053] See also Figure 3 and Figure 4 As shown, the mounting frame 201 includes a first side plate 211, a second side plate 212, a third side plate 213, and a fourth side plate 214 that are connected in an enclosing manner. With the inner wall of the cover 1 as the projection plane, the first side plate 211 and the third side plate 213 are arranged parallel to each other, and the second side plate 212 and the fourth side plate 214 are arranged parallel to each other. It also includes a first partition 215 and a second partition 216. The first partition 215 is arranged parallel to the second side plate 212 and the fourth side plate 214. The two sides of the partition 215 are perpendicularly connected to the first side plate 211 and the third side plate 213, respectively; the second partition 216 is arranged parallel to the first side plate 211 and the third side plate 213, one side wall of the second partition 216 is connected to the first partition 215, and the other side wall of the second partition 216 is connected to the fourth side plate 214; the first partition 215 and the second partition 216 divide the cavity into a first sub-cavity 251, a second sub-cavity 252 and a third sub-cavity 253.

[0054] Specifically, the mounting frame 201 is a frame structure formed by four plates. Both sides of the mounting frame 201 are open structures. A first partition 215 and a second partition 216 are provided in the mounting frame 201, thereby dividing the cavity into three chambers. Since the volumes of the first sub-cavity 251, the second sub-cavity 252 and the third sub-cavity 253 in this embodiment decrease sequentially, the length of the first partition 215 is greater than the length of the second partition 216, and the first partition 215 and the second partition 216 are arranged perpendicular to each other, the cavity can be divided according to the volume requirements in this way.

[0055] In this embodiment, by combining the structure of the mounting frame 201 and setting partitions in the mounting frame 201, the cavity is divided so that the second chambers in each sub-cavity are independent of each other, ensuring that the second chambers can form soundproof chambers between themselves and the inner wall of the cover 1. In this embodiment, two partitions are set to form three sub-cavities according to the noise reduction requirements. In other embodiments, more than two partitions can be set to form more than three sub-cavities according to the noise reduction requirements.

[0056] See also Figure 4 As shown, a first electromagnetic coil 31 is provided on the inner wall of the cover 1, and a second electromagnetic coil 32 is provided on the side of the elastic membrane 202 facing the inner wall of the cover 1. The first electromagnetic coil 31 and the second electromagnetic coil 32 are arranged opposite to each other, and there is a current change between the first electromagnetic coil 31 and the second electromagnetic coil, which is used to adjust the preload of the elastic membrane 202.

[0057] Specifically, when it is necessary to adjust the preload of the elastic membrane 202, the current of the first electromagnetic coil 31 and the second electromagnetic coil 32 is changed, causing a change in the interaction force between the two electromagnetic coils. This causes a change in the force exerted by the mass block 204 towards the inner wall of the cover 1, thereby pulling the membrane and causing a change in the membrane preload. This, in turn, adjusts the vibration frequency of the mass block 204 and the elastic membrane 202, thus achieving adjustable noise reduction peak frequency. In this embodiment, the first electromagnetic coil 31 and the second electromagnetic coil 32 are arranged in pairs. The pair arrangement is to adjust the pulling force of the mass block 204 towards the cavity, indirectly adjusting the preload of the elastic membrane 202, thereby adjusting the resonant frequency of each sub-cavity and achieving noise reduction effects at different frequencies.

[0058] In one specific implementation, the cavity has three independent sub-cavities: a first sub-cavity 251, a second sub-cavity 252, and a third sub-cavity 253. Each sub-cavity 251, 252, and 253 has an elastic membrane 202. Each elastic membrane 202 has a mass block 204 mounted on it. Two second electromagnetic coils 32 are mounted on the side of each elastic membrane 202 facing the inner wall of the cover 1. Two first electromagnetic coils 31 are mounted on the inner wall of the cover 1 corresponding to each sub-cavity. This configuration... In the optimal implementation of this embodiment, the preload of the elastic membrane 202 in each sub-cavity can be adjusted, and the mass block 204 on each elastic membrane 202 will resonate with the sound wave. In this way, the elastic membrane 202 can be used for a wider range of noise frequencies, and the mass block 204 can also be provided with a certain support force, making it easier to resonate with the sound wave. This allows multiple noise reduction peaks to exist in each unit cell 2 at the same time. Even if the sound wave peaks transmitted from different directions of the cover 1 are different, noise reduction can still be achieved, thereby realizing a wideband noise reduction effect.

[0059] As a specific implementation, the elastic membrane 202 is a thin-film acoustic metamaterial. When using this material, there is a problem of narrow noise reduction frequency. In this embodiment, by setting a first linear magnetic coil and a second electromagnetic coil 32, the preload of the elastic membrane 202 can be adjusted, thereby broadening the noise reduction frequency of the elastic membrane 202. Traditional thin-film materials are very light and vibrate at high frequencies, making it difficult to achieve low-frequency noise reduction. In this embodiment, a rigid mass block 204 is set on the elastic membrane 202. The rigid mass block 204 is fixed on the elastic membrane 202, and the elastic membrane 202 can provide a certain support, achieving a lightweight and low-frequency sound insulation effect.

[0060] See also Figure 1 As shown, the cover 1 includes an outer shell 101 and a damping layer 102. The outer wall of the outer shell 101 is provided with the damping layer 102, and the mounting frame 201 is connected to the side wall of the outer shell 101 away from the damping layer 102.

[0061] In this embodiment, the mounting frame 201 of each unit cell 2 is mounted on the outer shell 101. When the cover 1 is set in the outdoor unit cover 5, the outdoor unit cover 5 is a sheet metal part. By setting a damping layer 102 on the outside of the outer shell 101 and applying the damping layer 102 to the outdoor unit cover 5, the soundproof cover and the sheet metal part can be connected by damping, and the radiated noise of the sheet metal can also be suppressed.

[0062] A control method, in conjunction with [see also...] Figure 5 As shown, the control method is used to control the aforementioned soundproof enclosure. When a first electromagnetic coil 31 is provided on the inner wall of the enclosure 1, and a second electromagnetic coil 32 is provided on the side of the elastic membrane 202 facing the inner wall of the enclosure 1, the control method includes:

[0063] S1: The user sends a power-on command to obtain the operating frequency of the noise source 4. The operating frequency of the noise source 4 is the first frequency. When obtaining the first frequency from the database, the first electrical signal value corresponding to each unit cell 2 is adjusted to the first electrical signal value.

[0064] S2: Continuously acquire the operating frequency of the noise source 4. If the operating frequency of the noise source 4 remains unchanged, keep the first electrical signal value of the unit cell 2 unchanged. If the operating frequency of the noise source 4 changes, reacquire the electrical signal value of each unit cell 2 corresponding to the operating frequency in the database according to the operating frequency of the noise source 4.

[0065] It is worth noting that, in this embodiment, the noise source 4 is the compressor and related piping structure.

[0066] See also Figure 6 As shown, when the cavity has independent first sub-cavities 251, second sub-cavities 252, and third sub-cavities 253, and each of the first sub-cavities 251, second sub-cavities 252, and third sub-cavities 253 is provided with an elastic membrane 202, and a second electromagnetic coil 32 is provided on the side of the elastic membrane 202 in each sub-cavity facing the inner wall of the cover 1, and a first electromagnetic coil 31 is provided on the inner wall of the cover 1 corresponding to each sub-cavity, the steps for establishing the database include:

[0067] S11: Establish a simulation model of the acoustic radiation of the compressor components;

[0068] S12: Establish monitoring points with the center coordinates of each unit cell 2 to obtain the noise frequency response curve in front of each unit cell 2, that is, the noise frequency response curve of each unit cell 2 when receiving noise.

[0069] S13: Using the electrical signals of the first electromagnetic coil 31 and the second electromagnetic coil 32 corresponding to the first sub-cavity 251, the second sub-cavity 252 and the third sub-cavity 253 in each unit cell 2 as variables, and taking the noise value behind the unit cell 2 as the minimum target, that is, taking the noise value after noise reduction of the unit cell 2 as the minimum target, the minimum target here refers to taking the noise reduction effect as the goal, to obtain the electrical signal values ​​in each sub-cavity of the noise source 4 at different frequencies, and form a database.

[0070] It is worth noting that the database in this embodiment is a pre-established database. The database can be established through simulation, experimental testing, or during the actual operation of the compressor. Because compressor noise transmission is directional, even at the same frequency, the noise peak value transmitted in different directions will be different, and the noise peak value will also be different at different frequencies. However, at the same frequency, the noise peak value in the same direction will not change. Therefore, depending on different situations, each unit cell 2 can simultaneously have multiple noise reduction peak values ​​in the same direction, thus broadening the noise reduction frequency band.

[0071] A compressor is provided with a soundproof cover. The compressor is a noise source 4. The soundproof cover is the aforementioned soundproof cover. The soundproof cover can cover the compressor and related piping structure. Since the compressor is installed in an outdoor unit, the soundproof cover is connected to the inner wall of the outdoor unit cover 5.

[0072] In this embodiment, the high-frequency noise generated by the compressor is the motor position, and the low-frequency noise is the entire structure. This embodiment can also adjust the position with high noise.

[0073] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0074] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A soundproof cover, characterized in that, include: The cover (1) and the unit cell (2) for noise reduction: The inner wall of the cover (1) is arranged with multiple unit cells (2), and the cover (1) has a cavity for accommodating the noise source (4); The unit cell (2) includes a mounting frame (201) and an elastic membrane (202). The mounting frame (201) is connected to the inner wall of the cover (1) and has a cavity. The side wall of the elastic membrane (202) is connected to the inner wall of the mounting frame (201). The elastic membrane (202) divides the cavity into a first chamber (203) and a second chamber that are independent of each other. The first chamber (203) faces the receiving cavity. The second chamber forms a soundproof chamber between itself and the inner wall of the cover (1). A mass block (204) is provided on the side of the elastic membrane (202) facing the receiving cavity. The preload of the elastic membrane (202) is adjustable. The cavity has a first sub-cavity (251), a second sub-cavity (252), and a third sub-cavity (253) that are independent of each other. Each of the first sub-cavity (251), the second sub-cavity (252), and the third sub-cavity (253) is provided with an elastic membrane (202). Each of the first sub-cavity (251), the second sub-cavity (252), and the third sub-cavity (253) is divided into a first chamber (203) and a second chamber by a corresponding elastic membrane (202). The volume of the first sub-cavity (251), the second sub-cavity (252), and the third sub-cavity (253) decreases sequentially. Each of the elastic membranes (202) corresponding to the first sub-cavity (251), the second sub-cavity (252), and the third sub-cavity (253) is provided with a mass block (204), and the mass of the mass block (204) decreases sequentially.

2. The soundproof cover according to claim 1, characterized in that, The cavity has multiple sub-cavities, each of which is provided with an elastic membrane (202). Each sub-cavity is divided by the elastic membrane (202) into a first chamber (203) and a second chamber that are independent of each other.

3. The soundproof cover according to claim 1, characterized in that, The mounting frame (201) includes a first side plate (211), a second side plate (212), a third side plate (213), and a fourth side plate (214) that are connected in a surrounding manner. With the inner wall of the cover (1) as the projection plane, the first side plate (211) and the third side plate (213) are arranged parallel to each other, and the second side plate (212) and the fourth side plate (214) are arranged parallel to each other. It also includes a first partition (215) and a second partition (216). The first partition (215) is arranged parallel to the second side plate (212) and the fourth side plate (214). The two sides of the first partition (215) are perpendicularly connected to the first side plate (211) and the third side plate (213), respectively. The second partition (216) is arranged parallel to the first side plate (211) and the third side plate (213). One side wall of the second partition (216) is connected to the first partition (215), and the other side wall of the second partition (216) is connected to the fourth side plate (214). The first partition (215) and the second partition (216) divide the cavity into the first sub-cavity (251), the second sub-cavity (252), and the third sub-cavity (253).

4. The soundproof cover according to claim 1, characterized in that, The inner wall of the cover (1) is provided with a first electromagnetic coil (31), and the elastic membrane (202) is provided with a second electromagnetic coil (32) on the side facing the inner wall of the cover (1). The first electromagnetic coil (31) and the second electromagnetic coil (32) are arranged opposite to each other. There is a current change between the first electromagnetic coil (31) and the second electromagnetic coil, which is used to adjust the preload of the elastic membrane (202).

5. The soundproof cover according to claim 1, characterized in that, The cover (1) includes an outer shell (101) and a damping layer (102). The outer wall of the outer shell (101) is provided with the damping layer (102), and the mounting frame (201) is connected to the inner wall of the outer shell (101).

6. A control method, characterized in that, The control method is used to control the soundproof enclosure according to any one of claims 1 to 5. When the inner wall of the enclosure (1) is provided with a first electromagnetic coil (31) and the elastic membrane (202) is provided with a second electromagnetic coil (32) on the side facing the inner wall of the enclosure (1), the control method includes: The operating frequency of the noise source (4) is obtained. The operating frequency of the noise source (4) is the first frequency. When the first frequency is obtained from the database, the first electrical signal value corresponding to each unit cell (2) is adjusted to the first electrical signal value. The operating frequency of the noise source (4) is continuously acquired. If the operating frequency of the noise source (4) remains unchanged, the first electrical signal value of the unit cell (2) remains unchanged. If the operating frequency of the noise source (4) changes, the electrical signal value of each unit cell (2) corresponding to the operating frequency is reacquired from the database according to the operating frequency of the noise source (4).

7. The control method according to claim 6, characterized in that, When the cavity has a first sub-cavity (251), a second sub-cavity (252), and a third sub-cavity (253) that are independent of each other, and the first sub-cavity (251), the second sub-cavity (252), and the third sub-cavity (253) are respectively provided with the elastic membrane (202), and the side of the elastic membrane (202) in each sub-cavity facing the inner wall of the cover (1) is provided with a second electromagnetic coil (32), and the inner wall of the cover (1) corresponding to each sub-cavity is provided with a first electromagnetic coil (31), the steps for establishing the database include: A monitoring point is established with the center coordinates of each unit cell (2) to obtain the noise frequency response curve of each unit cell (2) when receiving noise; Using the electrical signals of the first electromagnetic coil (31) and the second electromagnetic coil (32) corresponding to the first sub-cavity (251), the second sub-cavity (252) and the third sub-cavity (253) in each unit cell (2) as variables, and taking the noise value after noise reduction of the unit cell (2) as the minimum target, the electrical signal values ​​in each sub-cavity of the noise source (4) at different frequencies are obtained to form the database.

8. A compressor, wherein the compressor is provided with a soundproof cover, the compressor being a noise source (4), and the soundproof cover being the soundproof cover according to any one of claims 1 to 5.

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