Muffler and control method

Abstract

The present invention provides a muffler and a control method, comprising: a main body having a muffler inlet, a muffler outlet, and a muffler cavity connected to the muffler inlet and the muffler outlet; a muffler structure disposed within the muffler cavity, the muffler structure comprising a thin film muffler unit and a back cavity muffler unit connected to each other; and an additional weight structure fixedly connected to a side of the thin film muffler unit away from the back cavity muffler unit, the weight of the additional weight structure being adjustable to adjust the overall resonant frequency of the thin film muffler unit and the additional weight structure. The technical solution provided by the present invention can solve the technical problem of poor muffler effect for variable frequency sound sources in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of mufflers, and in particular to a muffler and a control method thereof. Background Art

[0002] Currently, noise has adverse effects on the human body, so optimizing noise is an important step that cannot be omitted in the design of household appliances. Taking variable-frequency air conditioners as an example, the noise sources include the fan, air duct, and variable-frequency compressor. The noise of the air conditioner compressor is particularly difficult to control for the following reasons: (1) The operating frequency of the compressor is not constant but changes with the ambient temperature; (2) The maximum operating frequency of the compressor is generally 80Hz, so the noise frequency it generates is mainly in the medium and low frequency bands.

[0003] However, the mufflers in the prior art are mainly used for structure-borne noise with a fixed frequency, and have a poor muffler effect for variable frequency structures. Summary of the Invention

[0004] The main purpose of the present invention is to provide a muffler and a control method to solve the technical problem of poor muffler effect for variable frequency sound sources in the prior art.

[0005] In order to achieve the above object, according to one aspect of the present invention, a muffler is provided, comprising:

[0006] The main body has a muffler inlet, a muffler outlet, and a muffler cavity connected to the muffler inlet and the muffler outlet;

[0007] A sound-absorbing structure is arranged in the sound-absorbing cavity, and the sound-absorbing structure includes a film sound-absorbing unit and a back cavity sound-absorbing unit connected to each other;

[0008] An additional weight structure is fixedly connected to a side of the thin film silencer unit away from the back cavity silencer unit, and the weight of the additional weight structure can be adjusted to adjust the overall resonance frequency of the thin film silencer unit and the additional weight structure.

[0009] Furthermore, the muffler further comprises:

[0010] A first detection member is provided at the entrance of the muffler, and is used to detect the sound condition at the entrance of the muffler; and / or,

[0011] The second detection member is arranged at the silencer outlet and is used to detect the sound condition at the silencer outlet.

[0012] Furthermore, the muffler further comprises:

[0013] The control member, the first detection member is connected to the control member, and / or the second detection member is connected to the control member, so that the control member adjusts the weight of the additional weight structure according to the sound condition information detected by the first detection member and / or the second detection member.

[0014] Furthermore, the muffler further comprises:

[0015] a weight detection member, the weight detection member is used to detect the weight of the additional weight structure, the weight detection member is connected to the control member so that the control member adjusts the weight of the additional weight structure according to the weight information detected by the weight detection member; and / or,

[0016] Furthermore, the additional weight structure includes an adjustable water tank, and the weight of the liquid in the adjustable water tank can be adjusted.

[0017] Furthermore, the muffler further comprises:

[0018] a water pump connected to the adjustable water tank to provide water inflow into the adjustable water tank or water outflow from the adjustable water tank through the water pump; and / or,

[0019] The water storage tank is connected with the adjustable water tank so that the liquid in the water storage tank flows into the adjustable water tank or the liquid in the adjustable water tank flows into the water storage tank.

[0020] Furthermore, the water tank is arranged in the muffler cavity, and the water tank is installed on the inner wall of the main body.

[0021] Furthermore, the sound-absorbing structure further comprises:

[0022] Porous material, filled in the back cavity silencer unit.

[0023] Furthermore, the porous material is attached to a side of the back cavity silencer unit close to the thin film silencer unit, and the porous material is spaced apart from a side of the back cavity silencer unit away from the thin film silencer unit; and / or,

[0024] The porous material is made of sponge, foam copper, foam aluminum, or porous silicon carbide.

[0025] Furthermore, there are multiple additional weight structures, and the multiple additional weight structures are arranged at intervals on the film muffler unit; and / or,

[0026] The muffler structure is installed at the bottom of the main body, the outer edges of the film muffler unit and the outer edges of the back cavity muffler unit are connected to the side wall of the main body, and the back cavity muffler unit is located below the film muffler unit; and / or,

[0027] The flow cross-section of the muffler chamber is larger than the flow cross-section of the muffler inlet; and / or,

[0028] The flow cross section of the muffler cavity is larger than the flow cross section of the muffler outlet.

[0029] Furthermore, the thin film noise reduction unit is made of a PET film, a silicone film, or a nylon film; and / or,

[0030] The main body is made of ABS resin, aluminum, or steel.

[0031] According to another aspect of the present invention, a control method is provided, using the muffler provided above, the control method comprising:

[0032] Acquire the sound information at the muffler inlet and the sound information at the muffler outlet;

[0033] The weight of the additional weight structure of the muffler is adjusted according to the sound information at the muffler inlet and the sound information at the muffler outlet.

[0034] Furthermore, the weight of the additional weight structure of the muffler is adjusted according to the sound information at the muffler inlet and the sound information at the muffler outlet, including:

[0035] The sound wave frequency at the muffler inlet is used as a reference signal, and the sound wave frequency at the muffler outlet is used as an error signal, and the target frequency band to be muffled is obtained according to the reference signal and the error signal;

[0036] The target weight of the additional weight structure is obtained according to the target frequency band to adjust the weight of the additional weight structure.

[0037] Furthermore, obtaining the weight of the additional weight structure according to the target frequency band to adjust the weight of the additional weight structure includes:

[0038] comparing the target weight to the current weight of the attached weight structure;

[0039] When the target weight is greater than the current weight, the weight of the additional weight structure is increased;

[0040] When the target weight is equal to the current weight, the weight of the additional weight structure is controlled to remain unchanged;

[0041] When the target weight is less than the current weight, the weight of the additional weight structure is reduced.

[0042] Furthermore, the muffler is the muffler provided above, and the control method includes:

[0043] When the target weight is greater than the current weight, the water in the water storage tank of the muffler is controlled to flow into the adjustable water tank of the muffler;

[0044] When the target weight is less than the current weight, the water in the adjustable water tank is controlled to flow into the water storage tank.

[0045] By applying the technical solution of the present invention, an additional weight structure is fixedly provided on the thin film silencer unit, and the additional weight structure is made into a structure with adjustable weight. In this way, the weight of the additional weight structure can be adaptively adjusted according to actual needs, thereby adjusting the overall resonance frequency of the thin film silencer unit and the accessory weight part, so that it can be easily adapted to different noise environments to better achieve the noise reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0047] Figure 1 It shows a front view of a muffler provided according to the first embodiment of the present invention;

[0048] Figure 2 A side view of a muffler according to a first embodiment of the present invention is shown;

[0049] Figure 3 It shows a front view of a muffler with multiple additional weight structures provided according to the first embodiment of the present invention;

[0050] Figure 4 A flow chart of a control method provided according to the second embodiment of the present invention is shown.

[0051] The above drawings include the following reference numerals:

[0052] 10. Main body; 11. Silencer inlet; 12. Silencer outlet; 13. Silencer cavity;

[0053] 20. Noise elimination structure; 21. Thin film noise elimination unit; 22. Back cavity noise elimination unit; 23. Porous material;

[0054] 30. Additional weight structure;

[0055] 41. First detection part; 42. Second detection part;

[0056] 50. Control parts;

[0057] 60. Water pump;

[0058] 70. Water storage tank;

[0059] 80. Water pipe. DETAILED DESCRIPTION

[0060] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0061] like Figures 1 to 3 As shown, a first embodiment of the present invention provides a muffler, which includes: a main body 10, a muffler structure 20, and an additional weight structure 30. The main body 10 has a muffler inlet 11, a muffler outlet 12, and a muffler cavity 13 connected to the muffler inlet 11 and the muffler outlet 12. The muffler structure 20 is disposed in the muffler cavity 13, and the muffler structure 20 includes a thin film muffler unit 21 and a back cavity muffler unit 22 that are connected to each other. The additional weight structure 30 is fixedly connected to a side of the thin film muffler unit 21 away from the back cavity muffler unit 22, and the weight of the additional weight structure 30 is adjustable to adjust the overall resonant frequency of the thin film muffler unit 21 and the additional weight structure 30.

[0062] The silencer provided in this embodiment is configured such that an additional weight structure 30 is fixedly provided on the thin film silencer unit 21, and the additional weight structure 30 is a structure with adjustable weight. In this way, the weight of the additional weight structure 30 can be adaptively adjusted according to actual needs, thereby adjusting the overall resonance frequency of the thin film silencer unit 21 and the additional weight structure 30, thereby being able to adapt to different noise environments and achieve a better noise reduction effect.

[0063] It should be noted that "the weight of the additional weight structure 30 is adjustably set" can mean that the additional weight structure is composed of multiple weight blocks, and the weight of the additional weight structure 30 is changed by adding or reducing the weight blocks; "the weight of the additional weight structure 30 is adjustably set" can also mean that the additional weight structure stores fluid, and the weight of the additional weight structure 30 is changed by adding or reducing the fluid.

[0064] In this embodiment, the muffler further includes a first detection member 41, which is disposed at the muffler inlet 11 and is used to detect the sound conditions at the muffler inlet 11. Specifically, the first detection member 41 may be a sound frequency detection member to detect the frequency of incident sound waves at the muffler inlet 11.

[0065] Specifically, the muffler further includes a second detection member 42, which is disposed at the muffler outlet 12 and is used to detect the sound conditions at the muffler outlet 12. Specifically, the second detection member 42 can be a sound frequency detection member to detect the frequency of the transmitted sound waves at the muffler outlet 12.

[0066] In this embodiment, the muffler further includes a control member 50, and the first detection member 41 is connected to the control member 50, or the second detection member 42 is connected to the control member 50, or both the first detection member 41 and the second detection member 42 are connected to the control member 50, so that the control member 50 adjusts the weight of the additional weight structure 30 according to the sound condition information detected by the first detection member 41, or the second detection member 42, or the first detection member 41 and the second detection member 42. With such a structural arrangement, it is possible to adjust the weight of the additional weight structure 30 according to the sound condition of the muffler inlet 11, or the sound condition of the muffler outlet 12, or the sound condition at the muffler inlet 11 and the sound condition at the muffler outlet 12, thereby improving the adjustment accuracy of the additional weight structure 30, so that the overall resonance frequency of the thin film muffler unit 21 and the additional weight structure 30 meets the muffler requirement, thereby improving the muffler effect.

[0067] Specifically, the muffler further includes a weight detection element for detecting the weight of the additional weight structure 30. The weight detection element is connected to the control element 50 so that the control element 50 adjusts the weight of the additional weight structure 30 based on the weight information detected by the weight detection element. This can improve the accuracy of the weight adjustment of the additional weight structure 30 by the control element 50, thereby facilitating real-time weight control.

[0068] Specifically, in this embodiment, the control member 50 is disposed within the muffler cavity 13 and mounted on the inner wall of the main body 10. This structural arrangement facilitates the integration of the muffler and improves the overall aesthetics of the structure. Specifically, the control member 50 is disposed on the top wall of the main body 10 to prevent interference with other components.

[0069] In this embodiment, the additional weight structure 30 includes an adjustable water tank, and the weight of the liquid in the adjustable water tank is adjustable. Such a structural arrangement is simple, easy to operate and adjust, and is convenient for effectively and adaptively adjusting the weight of the adjustable water tank.

[0070] Specifically, the muffler further includes a water pump 60 , which is connected to the adjustable water tank so as to provide water inlet power flowing into the adjustable water tank or water outlet power flowing out of the adjustable water tank through the water pump 60 .

[0071] In this embodiment, the muffler further includes a water tank 70 , which is communicated with the adjustable water tank so that the liquid in the water tank 70 flows into the adjustable water tank or the liquid in the adjustable water tank flows into the water tank 70 .

[0072] Specifically, the water tank 70 is disposed in the muffler cavity 13 and is mounted on the inner wall of the main body 10. This structural arrangement can facilitate the integration of the muffler and improve the aesthetic appearance of the overall structure.

[0073] Specifically, the water tank 70 is installed on a side of the control component 50 away from the top wall of the main body 10, which facilitates the connection between the water tank 70 and structures such as the water pump 60 and avoids interference of the water tank 70 with other components.

[0074] In this embodiment, the sound-absorbing structure 20 further includes a porous material 23, which is filled within the back cavity sound-absorbing unit 22. With this structural arrangement, the thin film sound-absorbing unit 21 and the additional weight structure 30 can generate local resonance in the low-frequency band, while the porous material 23 can absorb sound in the medium and high-frequency bands, thereby achieving the goal of low-frequency broadband sound absorption.

[0075] Specifically, the porous material 23 is attached to the side of the back cavity silencer unit 22 close to the thin film silencer unit 21, and the porous material 23 is spaced apart from the side of the back cavity silencer unit 22 away from the thin film silencer unit 21 to improve the silencer effect.

[0076] Specifically, the porous material 23 is made of sponge, foamed copper, foamed aluminum, or porous silicon carbide.

[0077] In this embodiment, there are multiple additional weight structures 30, and the multiple additional weight structures 30 are spaced apart on the membrane silencer unit 21 so as to better adjust the resonance frequency and achieve a better silencer effect. Specifically, multiple adjustable water tanks of equal volume can be evenly distributed on the membrane silencer unit 21, and each adjustable water tank is connected to the storage water tank on the top through a water pipe 80 and a water pump 60. Since different weight distributions on the membrane correspond to different structural resonance frequencies, the weights of the three adjustable water tanks are not required to be exactly the same, and the sizes of the three will be obtained through the specific calculation of the control component 50. Furthermore, since the overall weight on the membrane becomes larger, the operating frequency range corresponding to the active silencer can become lower.

[0078] Specifically, the bottom of the main body 10 has an installation opening, the muffler structure 20 is installed in the installation opening, and the periphery of the thin film muffler unit 21 is adapted to the periphery of the installation opening, so that the thin film muffler unit 21 is installed in the installation opening and connected to the main body 10. This facilitates the installation of the thin film muffler unit 21 and also facilitates better noise reduction.

[0079] Specifically, the flow cross-section of the muffler cavity 13 is larger than the flow cross-section of the muffler inlet 11 , so that the muffler cavity 13 forms an expansion chamber structure.

[0080] Specifically, the flow cross-section of the muffler cavity 13 is larger than the flow cross-section of the muffler outlet 12 so as to increase the flow pressure at the muffler outlet 12 and to keep the flow pressure at the muffler outlet 12 consistent with the flow pressure at the muffler inlet as much as possible.

[0081] In this embodiment, the thin film noise reduction unit 21 is made of a PET film, a silicone film, or a nylon film, and has a simple structure and a good noise reduction effect.

[0082] Specifically, the main body 10 is made of ABS resin, aluminum, or steel, has a simple structure, good sound-absorbing effect, and is easy to manufacture. Specifically, the main body 10 can be a shell structure.

[0083] The present invention provides a muffler that responds to incident sound waves of varying frequencies, such as the varying noises generated by air conditioner compressors at varying operating frequencies. The additional weight structure 30 on the thin film muffler unit 21 can vary with the frequency, thereby varying the muffler's operating frequency range accordingly, thereby achieving the goal of low-frequency, broadband noise reduction. Specifically, for example, if the operating frequency of an air conditioner compressor varies with the environment, the dominant frequency of its noise will not only be relatively low but also constantly changing, thereby achieving the goal of low-frequency, broadband noise reduction within the air conditioner compressor.

[0084] like Figure 1 and Figure 2 As shown, the muffler in this embodiment is an active muffler. The muffler as a whole includes a single-section expansion chamber, and the various parts are sequentially composed of an air inlet, an air inlet sound sensor (corresponding to the first detection member 41), a control member 50, a water storage tank 70, a water pipe 80, a water pump 60, an adjustable water tank of the additional weight structure 30, a weight sensor at the adjustable water tank, a film muffler unit 21, a porous material 23, an air back cavity, an air outlet sound sensor (corresponding to the second detection member 42) and an air outlet. The air inlet sound sensor is used to measure the frequency of the incident sound wave, and the air outlet sound sensor is used to measure the frequency of the transmitted sound wave. The control member 50 is at the top of the expansion chamber, and it receives the sound wave frequency signal of the sound sensor at the air inlet / outlet and the weight signal of the weight sensor at the adjustable water tank. At the same time, the control member 50 also sends a control signal to the water storage tank 70, the adjustable water tank and the water pump 60 to control the switches of the three.

[0085] Specifically, the control element 50 can also be referred to as a controller. The water tank 70 below the control element 50 is used to store liquid, not just water. The water pipe 80 serves as a channel for liquid transport and extraction between the water tank 70, the water pump 60, and the adjustable water tank. Located near the rear wall of the muffler, it does not hinder the muffler's ventilation performance. The water pump 60, located between the water tank 70 and the adjustable water tank, is used to pump liquid from the adjustable water tank into the top water tank 70. A smaller miniature water pump 60 is sufficient. The adjustable water tank serves as an additional weight, attached to the membrane of the membrane muffler unit 21. Its weight can be flexibly adjusted by transporting liquid, and a weight sensor is placed on it to measure the weight of the adjustable water tank in real time. The membrane is attached to the lower half of the muffler expansion chamber, with all four sides connected to the inner wall of the muffler housing. The membrane can be made of any of the following materials: PET, silicone, or nylon. The muffler housing can be made of any of the following materials: ABS resin, aluminum, or steel. The air back cavity of the muffler is filled with a porous material 23 , which includes any of the following materials: sponge, foam copper, foam aluminum and porous silicon carbide.

[0086] like Figure 4 As shown, a second embodiment of the present invention provides a control method using the muffler provided in the first embodiment. The control method includes: obtaining sound information at the muffler inlet 11 and obtaining sound information at the muffler outlet 12; and adjusting the weight of the additional weight structure 30 of the muffler based on the sound information at the muffler inlet 11 and the sound information at the muffler outlet 12. This control method facilitates precise adjustment of the weight of the additional weight structure 30, thereby better adjusting the overall resonant frequency of the thin film muffler unit 21 and the additional weight structure 30.

[0087] In this embodiment, the weight of the additional weight structure 30 of the muffler is adjusted based on the sound information at the muffler inlet 11 and the sound information at the muffler outlet 12, including: using the sound wave frequency at the muffler inlet 11 as a reference signal and the sound wave frequency at the muffler outlet 12 as an error signal, obtaining a target frequency range to be muffled based on the reference signal and the error signal; obtaining a target weight of the additional weight structure 30 based on the target frequency range to adjust the weight of the additional weight structure 30. This method can further improve the accuracy of adjusting the weight of the additional weight structure 30, so that the overall resonant frequency of the thin film muffler unit 21 and the additional weight structure 30 is adjusted to within the target frequency range, thereby effectively improving the muffler effect.

[0088] Specifically, the weight of the additional weight structure 30 is obtained based on the target frequency band to adjust the weight of the additional weight structure 30, including: comparing the target weight with the current weight of the additional weight structure 30; when the target weight is greater than the current weight, increasing the weight of the additional weight structure 30; when the target weight is equal to the current weight, controlling the weight of the additional weight structure 30 to remain unchanged; when the target weight is less than the current weight, reducing the weight of the additional weight structure 30. This method can effectively and adaptively adjust the weight of the additional weight structure 30.

[0089] In this embodiment, the muffler is the muffler provided above, and the control method includes: when the target weight is greater than the current weight, controlling the water in the muffler's water storage tank 70 to flow into the muffler's adjustable water tank; when the target weight is less than the current weight, controlling the water in the adjustable water tank to flow into the water storage tank 70. This control method is simple to operate and facilitates real-time control of the weight of the additional weight structure 30.

[0090] The acoustic sensor at the air inlet measures the frequency of the incident sound wave, which serves as a reference signal sent to the control unit 50. The acoustic sensor at the air outlet measures the frequency of the transmitted sound wave, which serves as an error signal sent to the control unit 50. Based on the reference and error signals, the control unit 50 extracts the target frequency band for initial noise reduction and calculates the amount of additional weight on the membrane based on the principle of local resonance. The following is the relationship between the equivalent weight m of the membrane and the additional weight structure 30 and the structural resonance frequency f:

[0091]

[0092] Among them, k is the equivalent stiffness of the membrane structure. From the above formula, it can be seen that the greater the additional weight on the membrane, the smaller the corresponding operating frequency of the muffler.

[0093] Then, it is necessary to compare the additional weight calculated by the control component 50 with the current weight of the adjustable water tank. If the calculated additional weight is greater than the current weight, the control component 50 controls the water tank 70 to open, and the liquid in the water tank 70 will be transported to the adjustable water tank; if the calculated additional weight is less than the current weight, the control component 50 controls the water pump 60 and the adjustable water tank to open, and the liquid in the adjustable water tank is pumped into the water tank 70. During the liquid transportation, the weight sensor measures the weight of the adjustable water tank in real time and feeds it back to the control component 50. When the weight of the adjustable water tank is the same as the calculated additional weight, the control component 50 controls the water tank 70 and the water pump 60 to close. At this time, the resonant frequency of the additional weight and the entire membrane structure will be equal to the target frequency, and the membrane silencer unit 21 will undergo local resonance to achieve effective and flexible blocking of incident sound waves.

[0094] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the present invention uses a miniature water tank (i.e., an adjustable water tank) as an additional weight block on the film, and adopts real-time liquid delivery or extraction technology for the adjustable water tank according to different incident sound wave frequencies, so as to change the weight of the additional weight structure 30 on the film in real time, and then make the resonant frequency of the film and the additional weight structure 30 equal to the incident sound wave frequency, so that they undergo local resonance to achieve sound wave blocking. The variable additional weight structure 30 on the film in this invention can make the operating frequency range of the muffler lower and wider.

[0095] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0096] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0097] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element 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 this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0098] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the 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.

[0099] 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. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0100] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A muffler, characterized in that: include: A main body (10), the main body (10) having a muffler inlet (11), a muffler outlet (12), and a muffler cavity (13) in communication with both the muffler inlet (11) and the muffler outlet (12); A sound-absorbing structure (20) is arranged in the sound-absorbing cavity (13), and the sound-absorbing structure (20) comprises a thin film sound-absorbing unit (21) and a back cavity sound-absorbing unit (22) connected to each other; An additional weight structure (30), the additional weight structure (30) being fixedly connected to a side of the thin film muffler unit (21) away from the back cavity muffler unit (22), the weight of the additional weight structure (30) being adjustable to adjust the overall resonance frequency of the thin film muffler unit (21) and the additional weight structure (30); the additional weight structure (30) comprising an adjustable water tank, the weight of the liquid in the adjustable water tank being adjustable; A control member (50) is provided, wherein the control member (50) adjusts the weight of the additional weight structure (30) according to the sound conditions at the muffler inlet (11) and / or the muffler outlet (12).

2. The muffler according to claim 1, characterized in that The muffler further comprises: a first detection member (41) disposed at the muffler inlet (11), the first detection member (41) being used to detect the sound condition at the muffler inlet (11); and / or, The second detection member (42) is arranged at the muffler outlet (12), and the second detection member (42) is used to detect the sound condition at the muffler outlet (12).

3. The muffler according to claim 2, characterized in that The first detection member (41) is connected to the control member (50), and / or the second detection member (42) is connected to the control member (50), so that the control member (50) adjusts the weight of the additional weight structure (30) according to the sound condition information detected by the first detection member (41) and / or the second detection member (42).

4. The muffler according to claim 3, characterized in that The muffler further comprises: a weight detection member, the weight detection member being used to detect the weight of the additional weight structure (30), the weight detection member being connected to the control member (50) so that the control member (50) adjusts the weight of the additional weight structure (30) according to the weight information detected by the weight detection member; and / or, The control component (50) is arranged in the muffler cavity (13), and the control component (50) is mounted on the inner wall of the main body (10).

5. The muffler according to claim 1, characterized in that The muffler further comprises: a water pump (60) connected to the adjustable water tank to provide water inflow power to the adjustable water tank or water outflow power from the adjustable water tank through the water pump (60); and / or, A water storage tank (70) is connected to the adjustable water tank, so that the liquid in the water storage tank (70) flows into the adjustable water tank or the liquid in the adjustable water tank flows into the water storage tank (70).

6. The muffler according to any one of claims 1 to 4, characterized in that The noise reduction structure (20) further includes: The porous material (23) is filled in the back cavity sound-absorbing unit (22).

7. The muffler according to claim 6, characterized in that The porous material (23) is attached to a side of the back cavity sound-absorbing unit (22) close to the thin film sound-absorbing unit (21), and the porous material (23) is spaced apart from a side of the back cavity sound-absorbing unit (22) away from the thin film sound-absorbing unit (21); and / or, The porous material (23) is made of sponge, foam copper, foam aluminum, or porous silicon carbide.

8. The muffler according to any one of claims 1 to 4, characterized in that There are a plurality of additional weight structures (30), and the plurality of additional weight structures (30) are arranged at intervals on the thin film muffler unit (21); and / or, The muffler structure (20) is mounted on the bottom of the main body (10), the outer edge of the thin film muffler unit (21) and the outer edge of the back cavity muffler unit (22) are connected to the side wall of the main body (10), and the back cavity muffler unit (22) is located below the thin film muffler unit (21); and / or, The flow cross-section of the muffler cavity (13) is larger than the flow cross-section of the muffler inlet (11); and / or, The flow cross-section of the muffler cavity (13) is larger than the flow cross-section of the muffler outlet (12).

9. The muffler according to any one of claims 1 to 4, characterized in that The thin film muffler unit (21) is made of a PET film, a silicone film, or a nylon film; and / or, The main body (10) is made of ABS resin, aluminum, or steel.

10. A control method, characterized in that: Using the muffler according to any one of claims 1 to 9, the control method includes: Acquiring sound information at a muffler inlet and a muffler outlet of the muffler; The weight of the additional weight structure of the muffler is adjusted according to the sound information at the muffler inlet and the sound information at the muffler outlet.

11. The control method according to claim 10, characterized in that: Adjusting the weight of the additional weight structure of the muffler according to the sound information at the muffler inlet and the sound information at the muffler outlet includes: Using the sound wave frequency at the muffler inlet as a reference signal, using the sound wave frequency at the muffler outlet as an error signal, and obtaining a target frequency band to be muffled based on the reference signal and the error signal; The target weight of the additional weight structure is obtained according to the target frequency segment to adjust the weight of the additional weight structure.

12. The control method according to claim 11, characterized in that: Acquiring the weight of the additional weight structure according to the target frequency band to adjust the weight of the additional weight structure includes: comparing the target weight to a current weight of the added weight structure; When the target weight is greater than the current weight, increasing the weight of the additional weight structure; When the target weight is equal to the current weight, controlling the weight of the additional weight structure to remain unchanged; When the target weight is less than the current weight, the weight of the additional weight structure is reduced.

13. The control method according to claim 12, characterized in that: The muffler is the muffler described in claim 6, and the control method includes: When the target weight is greater than the current weight, controlling the water in the water storage tank of the muffler to flow into the adjustable water tank of the muffler; When the target weight is less than the current weight, the water in the adjustable water tank is controlled to flow into the water storage tank.

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