Silencing device, air conditioner and control method of air conditioner

Abstract

The invention provides a silencing device, an air conditioner and a control method of the air conditioner, the silencing device is provided with a shell, a first film and a second film are arranged in the shell, and the first film and the second film are distributed in the first direction and arranged face to face; and the first film and the second film are connected through a connecting rod, so that the technical problem that in the prior art, a vibration source needs to be changed to reduce the noise influence can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of noise elimination, and in particular relates to a noise elimination device, an air conditioner and a control method thereof. Background Art

[0002] In the outdoor unit of the air conditioner, the compressor, as the main moving component, will produce vibration and noise problems. The vibration and noise will be transmitted to the entire outdoor unit structure along the pipeline and the shell. When the frequency of the compressor is close to the value of the pipeline modal frequency, serious vibration and noise problems will occur at this time, and the vibration of the pipeline will cause a certain deformation of the structure, thereby reducing the reliability of the system. Therefore, it is essential to control the vibration and noise problems of the compressor pipeline. In the prior art, the noise reduction method of the vibration source is often used to reduce the impact of vibration. For example, in the prior art, the commonly used method to reduce pipeline vibration and noise is to increase the pipeline counterweight to reduce the pipeline modal frequency, so that the compressor excitation frequency and the pipeline resonance frequency are staggered to avoid resonance. Although adding counterweights can solve some vibration and noise problems, it may cause resonance of other pipeline frequencies. Its reliability is not high and the effect is not obvious. Another method is to add damping materials to the pipeline, such as rubber blocks, damping blocks, polyurethane and other materials with high elasticity, to consume the vibration energy of the pipeline. However, the vibration-damping rubber pad will be affected by various factors due to long-term exposure to the environment (such as temperature, light, humidity, etc.) during actual use, resulting in the breakage of the elastic molecular chain, destruction of the cross-linked structure or aging of the material, which will cause the vibration-damping rubber pad to harden and lose its vibration-damping effect, and lose its original elasticity and softness. Secondly, wrapping a layer of sound insulation cotton in the compressor pipeline system can effectively reduce high-frequency noise, but as the air conditioner is used for a longer period of time, the noise reduction performance of the sound insulation cotton itself will gradually decrease, and the noise reduction effect of the sound insulation cotton on low-frequency noise is not obvious.

[0003] How to reduce the adverse effects of compressor vibration without changing the compressor and pipelines is a technical problem that urgently needs to be solved. Summary of the invention

[0004] Therefore, the present invention provides a silencer, an air conditioner and a control method thereof, which can solve the technical problem in the prior art that the vibration source needs to be modified to reduce the adverse effects of noise.

[0005] In a first aspect, the present invention provides a silencer device, which is arranged on a sound propagation path. The silencer device has a shell, in which a first film and a second film are arranged. The first film and the second film are distributed along a first direction and arranged face to face. The first film and the second film are connected via a connecting rod.

[0006] In some embodiments, the edge of the first film and the edge of the second film are both sealed to the inner wall of the shell, and a closed cavity is formed between the first film and the second film, and the closed cavity is filled with an inert gas with a density less than that of air.

[0007] In some embodiments, the silencer device includes an air pressure regulating component, and the air pressure regulating component is used to adjust the gas pressure in the closed cavity.

[0008] In some embodiments, the muffler device includes a battery;

[0009] The first film is a first piezoelectric film, and the first piezoelectric film is connected to the battery via a wire;

[0010] and / or,

[0011] The second film is a second piezoelectric film, and the second piezoelectric film is connected to the battery via a wire.

[0012] In some embodiments, along the first direction, the housing includes a first side wall adjacent to the first film and a second side wall adjacent to the second film;

[0013] A first porous sound absorbing member is disposed between the first side wall and the first film, and / or a second porous sound absorbing member is disposed between the second side wall and the second film.

[0014] In some embodiments, a third film is disposed in the sealed cavity, an edge of the third film is sealed and connected to the inner wall of the shell, the connecting rod passes through the third film, and the third film is sealed and connected to the connecting rod.

[0015] In some embodiments, the length of the connecting rod is adjustable.

[0016] In a second aspect, the present invention also provides an air conditioner, comprising the above-mentioned silencer; the air conditioner comprises an outdoor unit, the outdoor unit comprises a compressor and an outdoor fan, the compressor and the outdoor fan are separated by a partition, and the silencer is arranged on the partition and located on one side of the outdoor fan.

[0017] In some embodiments, the first direction is consistent with the axial direction of the compressor, the shell is provided with a first opening and a second opening, when a first porous sound absorbing member and a second porous sound absorbing member are provided, the first porous sound absorbing member is provided inside the first opening, and the second porous sound absorbing member is provided inside the second opening; the first opening and the second opening are both facing the partition, and the partition is provided with through holes corresponding to the first opening and the second opening.

[0018] In a third aspect, the present invention further provides a control method for an air conditioner. When a sealed cavity is provided, the control method comprises: obtaining a frequency P of noise, and adjusting the pressure in the sealed cavity according to the frequency P of noise.

[0019] The present invention sets two films, sets a connecting rod between the two films, and the two films are in a tensioned and flattened state and have a certain elasticity. When working, the sound wave makes the first film vibrate, and the first film transmits the sound wave to the second film with the same frequency and amplitude through the connecting rod. The vibration of the two films and the vibration of the sound source produce a phase difference, thereby achieving the technical effect of double film sound wave interference and cancellation, so that the sound wave is weakened when passing through the silencer, reducing the propagation of noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0021] Figure 1 Schematic diagram of the structure of the muffler device according to an embodiment of the present invention;

[0022] Figure 2 is a schematic structural diagram of a first film, a second film and a connecting rod when they are assembled together in an embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of a porous sound absorbing member according to an embodiment of the present invention;

[0024] Figure 4 is a schematic diagram of an air pump and an air tank in an embodiment of the present invention when combined together;

[0025] Figure 5 is a schematic diagram of a first perspective of a silencer device according to an embodiment of the present invention disposed on an outdoor unit;

[0026] Figure 6 is a schematic diagram from a second perspective showing that the muffler device according to an embodiment of the present invention is arranged on an outdoor unit;

[0027] Figure 7 is a third perspective schematic diagram of a silencer device according to an embodiment of the present invention being arranged on an outdoor unit;

[0028] Figure 8 It is a flow chart of pressure regulation in a closed cavity of a muffler device according to an embodiment of the present invention.

[0029] The accompanying drawings are marked as follows:

[0030] 1. First film; 2. Second film; 3. Shell; 301. First opening; 302. Second opening; 3031. First side wall; 3032. Second side wall; 4. Connecting rod; 501. First porous sound absorbing member; 502. Second porous sound absorbing member; 601. Air pump; 602. Air tank; 603. Wire; 604. Compressor; 605. Partition. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0033] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0034] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0035] The present invention provides a muffler, an air conditioner and a control method thereof, which can reduce the influence of noise without modifying a compressor.

[0036] See also Figure 1-7 As shown, a silencer device provided by the present invention is arranged on the sound propagation path, and the silencer device has a shell 3, and a first film 1 and a second film 2 are arranged in the shell 3. The first film 1 and the second film 2 are distributed along a first direction and arranged face to face; the first film 1 and the second film 2 are connected via a connecting rod 4.

[0037] By setting two films, connecting rods 4 are set between the two films, and the two films are in a tensioned and flattened state and have a certain elasticity. When working, the sound wave makes the first film 1 vibrate, and the first film 1 transmits the sound wave to the second film 2 with the same frequency and amplitude through the connecting rod 4. The vibration of the two films and the vibration of the sound source produce a phase difference, thereby achieving the technical effect of double film sound wave interference and cancellation, so that the sound wave is weakened when passing through the silencer, reducing the propagation of noise.

[0038] Preferably, the connecting rod 4 is a lightweight rigid connecting rod 4 , that is, the connecting rod 4 has a small weight and a large rigidity, so that the connecting rod 4 can easily transmit vibration.

[0039] Preferably, Figure 2 As shown, the edge of the first film 1 and the edge of the second film 2 are both sealed and connected to the inner wall of the shell 3, and a closed cavity is formed between the first film 1 and the second film 2, and the closed cavity is filled with an inert gas with a density less than that of air.

[0040] Two tensioned membranes, inert gas filled between the two membranes, and connecting rod 4, these three structures together constitute a "spring-mass" system. The membrane will produce displacement deformation due to the acoustic-vibration coupling effect, thereby dissipating part of the acoustic energy radiated by the compressed pipeline.

[0041] The thin film structure dissipates part of the low-frequency noise energy through acoustic-vibration coupling. At this time, the sound pressure on both sides of the thin film structure is equal to the particle vibration velocity, that is, P1 = P2, u1 = u2. For the sound pressure, its expression is P(x) = Ae -jkx +Be jkx , the particle velocity expression is Where A and B are the acoustic wave amplitude coefficients, k is the wave number, x is the position in the coordinates, is the density of the sound propagation medium, and c is the sound velocity of the sound propagation medium. Since the sound pressure at the boundary and the particle vibration velocity have the relationship of P1=P2 and u1=u2, for the transmission of sound waves at the boundary, the transmission loss of the sound waves is related to the density and sound velocity of the medium in different regions, and the density of the medium will also affect the frequency corresponding to the sound wave transmission loss. When the sound wave is transmitted from the air medium to the helium medium between the two films, the acoustic impedance of the propagation process changes, so the energy of the low-frequency noise will be further reduced.

[0042] By filling the closed cavity with an inert gas with a density lower than that of air, such as helium, the low-frequency noise of the chamber of the compressor 604 is reduced due to the mismatch in acoustic impedance between the air medium and the helium medium. In addition, the inert gas is extremely inactive, and the sound waves will be greatly weakened when transmitted in the inert gas.

[0043] Preferably, Figure 1 Figure 5 and Figure 6 As shown, the silencer device includes an air pressure regulating component, and the air pressure regulating component is used to adjust the gas pressure in the closed cavity.

[0044] Furthermore, the air pressure regulating assembly includes an air pump 601 and an air tank 602. The air pump 601 can be used to fill the closed cavity with air to increase the pressure in the closed cavity, and the air pump 601 can also be used to pump the air in the closed cavity into the air tank 602 to reduce the pressure in the closed cavity. When the gas in the closed cavity is helium, the air tank 602 stores helium.

[0045] From the relationship between the sound pressure at different interfaces and the particle vibration velocity, it can be seen that the density of helium and the speed of sound are related to the transmission loss and frequency of sound waves. Therefore, the air pressure regulating component adjusts the helium pressure inside the closed cavity so that the silencer can weaken sound waves of different frequencies, that is, change the silencer frequency of the thin film silencer.

[0046] Preferably, Figure 1 As shown, the muffler device includes a battery;

[0047] The first film 1 is a first piezoelectric film, and the first piezoelectric film is connected to the battery via a wire 603;

[0048] and / or,

[0049] The second film 2 is a second piezoelectric film, and the second piezoelectric film is connected to the battery via a wire 603 .

[0050] The first film 1 is a first piezoelectric film, which is connected to the battery via a wire 603; the second film 2 is a second piezoelectric film, which is connected to the battery via a wire 603. The two films are piezoelectric films, and the films vibrate to generate electric charges, which are transferred to the battery for storage via the wire 603. The electric charges stored in the battery can be used as a backup power source to achieve the purpose of energy recovery.

[0051] Furthermore, the two piezoelectric films are β-type PVDF piezoelectric films. PVDF piezoelectric film is a polyvinylidene fluoride piezoelectric film, which will generate certain charges on the polarization surface of the material when subjected to external force or deformation in a certain direction.

[0052] Preferably, Figure 1 As shown, along the first direction, the housing 3 includes a first side wall 3031 adjacent to the first film 1 and a second side wall 3032 adjacent to the second film 2;

[0053] A first porous sound absorbing member 501 is disposed between the first side wall 3031 and the first film 1 , and / or a second porous sound absorbing member 502 is disposed between the second side wall 3032 and the second film 2 .

[0054] On the one hand, the porous sound absorbing member can absorb high-frequency noise and improve the sound-absorbing effect of the sound-absorbing device; on the other hand, the porous sound absorbing member has a heat-insulating effect. The two films are arranged between the two porous sound absorbing members, which effectively reduces the influence of the external temperature on the two films, so that the two films can always be in a good elastic state, avoiding the rapid aging of the films due to heat, reducing the service life, and improving the sound-absorbing effect of the sound-absorbing device. The sound-absorbing device is particularly suitable for environments that generate both noise and heat, such as the scene where the compressor 604 is working. The vibration of the compressor 604 generates noise, and the compressor 604 generates high temperature when compressing the gas. In this environment, the sound-absorbing device can not only effectively eliminate noise, but also avoid the adverse effects of the high temperature environment on the film.

[0055] Furthermore, the porous sound-absorbing member is made of porous fiber sound-absorbing material. A gap is formed between the first porous sound-absorbing member 501 and the first film 1, and a gap is formed between the second porous sound-absorbing member 502 and the second film 2. The setting of the gap ensures that the porous sound-absorbing member does not hinder the vibration of the film.

[0056] Preferably, a third film is provided in the sealing cavity, the edge of the third film is sealingly connected to the inner wall of the shell 3 , the connecting rod 4 passes through the third film, and the third film is sealingly connected to the connecting rod 4 .

[0057] By setting up the third film, the three-layer film can silence noise of more wavelengths. The third film divides the closed cavity into two, and the air pressure in the two cavities is different, thereby weakening noise of different frequencies and wavelengths.

[0058] Preferably, the length of the connecting rod 4 is adjustable.

[0059] By adjusting the length of the connecting rod 4, the tension of the first film 1 and the second film 2 is different, so that the muffler can adapt to different noise environments and weaken noises of different frequencies and wavelengths. Since the film has a certain elasticity and service life, the elasticity of the film decreases after long-term use. By adjusting the length of the connecting rod 4, the first film 1 and the second film 2 are always in a tensioned state, thereby increasing the service life of the film.

[0060] The present invention also provides an air conditioner, such as Figure 5-7 As shown, the silencer device is included; the air conditioner includes an outdoor unit, the outdoor unit includes a compressor 604 and an outdoor fan, the compressor 604 and the outdoor fan are separated by a partition 605, and the silencer device is arranged on the partition 605 and is located on one side of the outdoor fan.

[0061] The noise of the outdoor unit mainly comes from the vibration generated by the operation of the compressor 604. The silencer is set on the middle partition 605 and is located on one side of the outdoor fan. When the noise generated by the compressor 604 is transmitted to the silencer, the noise passes through the first film 1 and the second film 2. Some of the sound waves generated by the vibration of the two films and the vibration of the compressor 604 will have a phase difference, thereby weakening the propagation of the sound waves.

[0062] The volume of the chamber where the compressor 604 is located is relatively small, which makes it inconvenient to install a silencer. In addition, the operation of the compressor 604 not only generates noise, but also generates a lot of heat. The heat has an adverse effect on the film of the silencer. High temperature will cause the film to age faster, which is not conducive to the silencer's noise reduction. At the same time, the silencer and the outdoor fan are arranged on the same side of the partition 605. The operation of the outdoor fan can accelerate the flow of gas outside the shell 3, further avoiding the silencer's temperature from being too high.

[0063] Preferably, Figure 7As shown, the first direction is consistent with the axial direction of the compressor 604, the shell 3 is provided with a first opening 301 and a second opening 302, when a first porous sound absorbing member 501 and a second porous sound absorbing member 502 are provided, the first porous sound absorbing member 501 is arranged on the inner side of the first opening 301, and the second porous sound absorbing member 502 is arranged on the inner side of the second opening 302; the first opening 301 and the second opening 302 are both facing the partition 605, and the partition 605 is provided with through holes corresponding to the first opening 301 and the second opening 302.

[0064] Through the above arrangement, the axial direction of the general compressor 604 is the vertical direction, so the first direction is also the vertical direction, the first film 1 and the second film 2 are also distributed in the up-down direction, and the first opening 301 and the second opening 302 are also distributed in the up-down direction. The noise generated by the motor and the pump body in the compressor 604 is mixed inside the compressor 604 and then propagates outward through the outer shell of the compressor 604. Since the axial direction of the outer shell of the compressor 604 is the vertical direction, the first direction of the silencer is also the vertical direction. The noise generated by the compressor 604 will enter the first opening 301 and the second opening 302 with a greater probability. In this way, the silencer can better weaken the noise generated by the compressor 604. Since the compressor 604 generates heat when working, the porous structure of the two porous sound-absorbing parts has a heat-insulating effect, thereby reducing the adverse effects of the high temperature generated by the compressor 604 on the two films, effectively ensuring the performance of the two films, avoiding the thermal aging of the two films, and improving the life of the films and the silencer performance.

[0065] The present invention also provides a control method for an air conditioner. When a sealed cavity is provided, the control method comprises: obtaining a frequency P of noise, and adjusting the pressure in the sealed cavity according to the frequency P of noise.

[0066] Different pressures of the inert gas in the sealed cavity can attenuate noises of different frequencies. Furthermore, an acoustic sensor is provided inside the gas filling port of the air pump 601 to sense the magnitude of the frequency of the sound wave. The frequency detected at the gas filling port of the air pump 601 can represent the frequency of the sound wave in the closed cavity; the sound wave is transmitted to the gas filling port of the air pump 601 through the inert gas (such as helium), and the frequency P of the sound wave is obtained.

[0067] Specifically, Figure 8As shown, firstly, the initial silencing performance of the thin film silencing device is obtained according to the structural characteristics of the film, the structural parameters of the closed cavity and the density of the filled helium; secondly, the influence of the pressure of the helium filled inside the thin film silencing device on the maximum silencing frequency of the silencing system is obtained through the calculation software, and the numerical law of the noise frequency changing with the helium density ρ is obtained, and the numerical change relationship between the initial density ρ0 of the helium filled in the thin film silencing device, the silencing frequency and the density ρ is input into the program of the controller, wherein the air pump 601 charging port senses the frequency of the sound wave, and the frequency information is input into the motor controller, so that the motor controller controls the gas tank 602 to charge and discharge the closed cavity with helium, thereby achieving the maximum silencing efficiency of the silencing device.

[0068] Specifically, by adjusting the content of the inert gas to change the air pressure in the closed cavity, the stability of the gas in the closed cavity is ensured, and the noise in the closed cavity will not be weakened or reduced due to the filling of the gas.

[0069] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A muffler device, arranged on a sound propagation path, comprising a housing (3), characterized in that: A first film (1) and a second film (2) are arranged in the shell (3); the first film (1) and the second film (2) are distributed along a first direction and arranged face to face; the first film (1) and the second film (2) are connected via a connecting rod (4).

2. The muffler device according to claim 1, characterized in that: The edge of the first film (1) and the edge of the second film (2) are both sealed to the inner wall of the shell (3), and a closed cavity is formed between the first film (1) and the second film (2), and the closed cavity is filled with an inert gas with a density less than that of air.

3. The muffler device according to claim 2, characterized in that: The silencer device comprises an air pressure regulating component, and the air pressure regulating component is used to regulate the gas pressure in the closed cavity.

4. The muffler device according to claim 1, characterized in that: The muffler device includes a battery; The first film (1) is a first piezoelectric film, and the first piezoelectric film is connected to the storage battery via a wire (603); and / or, The second film (2) is a second piezoelectric film, and the second piezoelectric film is connected to the storage battery via a wire (603).

5. The muffler device according to claim 1, characterized in that: Along the first direction, the housing (3) comprises a first side wall (3031) adjacent to the first film (1) and a second side wall (3032) adjacent to the second film (2); A first porous sound absorbing member (501) is arranged between the first side wall (3031) and the first film (1), and / or a second porous sound absorbing member (502) is arranged between the second side wall (3032) and the second film (2).

6. The muffler device according to claim 2, characterized in that: A third film is arranged in the sealed cavity, the edge of the third film is sealedly connected to the inner wall of the shell (3), the connecting rod (4) passes through the third film, and the third film is sealedly connected to the connecting rod (4).

7. The muffler device according to any one of claims 1 to 6, characterized in that: The length of the connecting rod (4) is adjustable.

8. An air conditioner, characterized in that: The air conditioner comprises the silencer device according to any one of claims 1 to 7; the air conditioner comprises an outdoor unit, the outdoor unit comprises a compressor (604) and an outdoor fan, the compressor (604) and the outdoor fan are separated by a partition (605), and the silencer device is arranged on the partition (605) and is located on one side of the outdoor fan.

9. The air conditioner according to claim 8, characterized in that: The first direction is consistent with the axial direction of the compressor (604); the shell (3) is provided with a first opening (301) and a second opening (302); when a first porous sound absorbing member (501) and a second porous sound absorbing member (502) are provided, the first porous sound absorbing member (501) is arranged on the inner side of the first opening (301), and the second porous sound absorbing member (502) is arranged on the inner side of the second opening (302); the first opening (301) and the second opening (302) are both facing the partition (605); and the partition (605) is provided with through holes corresponding to the first opening (301) and the second opening (302).

10. A control method for the air conditioner according to claim 8, characterized in that: When a sealed cavity is provided, the control method includes: obtaining a frequency P of noise, and adjusting the pressure in the sealed cavity according to the frequency P of noise.

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