A noise reduction cavity control method and a noise reduction system

Abstract

The present disclosure relates to a noise reduction cavity control method and a noise reduction system. The method is applied to the noise reduction system, which is installed in the inner cavity of an extractor hood. The noise reduction system comprises a fixed plate structure and a variable plate structure. The volume of an expansion cavity is positively correlated with the height of the variable plate structure extending from the fixed plate structure, and the volume of a fixed cavity is positively correlated with the height of the fixed plate structure. Both the expansion cavity and the fixed cavity belong to the noise reduction cavity. The method comprises: obtaining extractor hood fan noise information; performing frequency spectrum analysis on the extractor hood fan noise information to obtain noise spectrum data; performing energy proportion analysis on the noise spectrum data to obtain energy proportion information of the noise spectrum data in a preset frequency band; and in the case that the energy proportion information exceeds a preset proportion, controlling the variable plate structure to move vertically along a guide rail to change the ratio of the expansion cavity and the fixed cavity in the extractor hood. The present disclosure can eliminate noise in a specific frequency band and reduce the noise of the extractor hood.

Description

Technical Field

[0001] This invention relates to the field of noise reduction technology for range hoods, and in particular to a noise reduction cavity control method and noise reduction system. Background Technology

[0002] As an essential kitchen appliance, the range hood works by using a motor to drive an impeller within a centrifugal volute, creating negative pressure to draw away cooking fumes and vent them outdoors. To improve the exhaust efficiency, the motor speed is typically increased to boost airflow and air pressure. However, higher motor speeds also increase noise levels, and the sound emitted by a range hood is broadband, with the low-frequency range having a significant impact on human hearing. Therefore, noise reduction for range hoods is crucial. Summary of the Invention

[0003] To address at least one of the aforementioned technical problems, this disclosure proposes a noise reduction cavity control method and a noise reduction system.

[0004] On one hand, this disclosure provides a noise reduction cavity control method applied to a noise reduction system. The noise reduction system is installed inside the range hood cavity and includes a fixed plate structure and a variable plate structure. The volume of the expansion cavity is positively correlated with the height of the variable plate structure extending beyond the fixed plate structure, and the volume of the fixed cavity is positively correlated with the height of the fixed plate structure. Both the expansion cavity and the fixed cavity are noise reduction cavities. The method includes: Obtain noise information from the range hood fan; The noise spectrum information of the range hood fan was analyzed to obtain noise spectrum data; Energy proportion analysis is performed on noise spectrum data to obtain the energy proportion information of noise spectrum data within a preset frequency band; When the energy ratio exceeds the preset ratio, the variable plate structure is controlled to move vertically along the guide rail. This movement is used to change the ratio of the expansion cavity to the fixed cavity inside the range hood.

[0005] In an optional embodiment, controlling the vertical movement of the variable plate structure along the guide rail includes: Sound pressure amplitude analysis is performed on the target spectrum data to obtain target frequency band noise data. The target spectrum data is the spectrum data of the noise spectrum data that falls into the preset frequency band. The target frequency band noise data is the noise data at the point of maximum sound pressure amplitude in the noise frequency band corresponding to the target spectrum data. Determine the proportional information corresponding to the noise data of the target frequency band. The proportional information represents the ratio of the first height information to the second height information required to eliminate the noise of the target frequency band. The first height information is the height of the variable plate structure extending out of the fixed plate structure, and the second height information is the height of the fixed plate structure. Based on the proportional information, the variable plate structure is controlled to move vertically along the guide rail to the position corresponding to the proportional information.

[0006] In an optional embodiment, energy proportion analysis is performed on the noise spectrum data to obtain energy proportion information of the noise spectrum data within a preset frequency band, including: Determine the target spectrum data, which is the spectrum data in the noise spectrum data that falls into the preset frequency band; The target spectrum data is integrated to obtain energy percentage information.

[0007] In an optional embodiment, the noise information of the range hood fan is subjected to spectral analysis to obtain noise spectrum data, including: Fourier transform was performed on the noise information of the range hood fan to obtain the noise self-power spectrum in the frequency domain. The noise power spectrum is determined as the noise spectrum data.

[0008] Secondly, this disclosure also provides a noise reduction system for implementing the above-mentioned noise reduction cavity control method. The noise reduction system includes: a first moving structure and a second moving structure. The first moving structure is installed on the inner wall of one side of the range hood cavity, and the second moving structure is installed on the inner wall of the other side of the range hood cavity. The target moving structure includes a fixed plate structure and a variable plate structure. The target moving structure is either the first moving structure or the second moving structure. The variable plate structure moves vertically. The fixing plate structure includes a first fixing plate and a second fixing plate. The first fixing plate is fixed to the side wall of the range hood, and the second fixing plate is fixed to the rear wall of the range hood. The first fixing plate and the second fixing plate are arranged opposite to each other. The variable plate structure includes a variable plate, which is located between the first fixed plate and the corresponding side wall of the range hood. A fixed cavity is formed between the second fixed plate of the first movable structure and the second fixed plate of the second movable structure. An expansion cavity is formed between the variable plate of the first moving structure and the variable plate of the second moving structure.

[0009] In an optional embodiment, the variable plate structure further includes: a perforated plate; The perforated plate is attached to the second fixed plate, and the perforated plate is positioned opposite the variable plate.

[0010] In an optional embodiment, the perforated plate is further provided with a cavity channel for communicating with an expansion cavity.

[0011] In an optional embodiment, the target moving structure further includes: a motor; The motor is fixed to the rear wall of the range hood cavity and is used to drive the variable plate structure to move vertically along the slide rail.

[0012] Thirdly, this disclosure also provides a range hood including the aforementioned noise reduction system.

[0013] Fourthly, this disclosure also provides an integrated cooktop, including the aforementioned noise reduction system.

[0014] Implementing this disclosure will have the following beneficial effects: The noise reduction cavity control method is applied to a noise reduction system installed inside the range hood. The noise reduction system includes a fixed plate structure and a variable plate structure. The volume of the expansion cavity is positively correlated with the height of the variable plate structure extending beyond the fixed plate structure, and the volume of the fixed cavity is positively correlated with the height of the fixed plate structure. Both the expansion cavity and the fixed cavity are noise reduction cavities. The method includes: acquiring range hood fan noise information; performing spectral analysis on the range hood fan noise information to obtain noise spectrum data; performing energy proportion analysis on the noise spectrum data to obtain energy proportion information of the noise spectrum data within a preset frequency band; and controlling the variable plate structure to move vertically along the guide rail when the energy proportion information exceeds the preset proportion. This movement is used to change the ratio of the expansion cavity to the fixed cavity inside the range hood.

[0015] This disclosure obtains noise spectrum data by performing spectral analysis on the noise information of a range hood fan, which can transform the noise data in the time domain into noise data in the frequency domain, facilitating further analysis of the noise data. By performing energy ratio analysis on the noise spectrum data, energy ratio information is obtained, and when the energy ratio information exceeds a preset ratio, the variable plate structure is controlled to move vertically along the guide rail. The movement of the variable plate structure can change the cavity ratio between the expansion cavity and the fixed cavity, thereby achieving the effect of adjusting the noise reduction of a specific frequency band.

[0016] Other features and aspects of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions and advantages in the embodiments of this application or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The accompanying drawings are incorporated in and constitute a part of this specification, illustrating embodiments consistent with this disclosure, and are used together with the description to explain the principles of this disclosure, and do not constitute an improper limitation of this disclosure.

[0018] Figure 1 This is a schematic diagram of an implementation environment according to an exemplary embodiment; Figure 2 This is a flowchart illustrating a noise reduction cavity control method according to an exemplary embodiment; Figure 3 This is a schematic diagram illustrating a first altitude information and a second altitude information according to an exemplary embodiment; Figure 4 This is a schematic diagram of a noise reduction cavity control device according to an exemplary embodiment; Figure 5 This is a schematic diagram illustrating a noise reduction system according to an exemplary embodiment; Figure 6 This is a schematic diagram illustrating the detailed structure of a noise reduction system according to an exemplary embodiment; The following is supplementary explanation of the attached figures: 1-First moving structure; 2-Second moving structure; 3-Fixed plate structure; 301-First fixed plate; 302-Second fixed plate; 4-Variable plate structure; 401-Variable plate; 402-Perforated plate; 403-Cavity channel; 5-Motor. Detailed Implementation

[0019] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or server that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0021] Various exemplary embodiments, features, and aspects of this disclosure will now be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise. The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0022] In this document, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0023] Furthermore, to better illustrate this disclosure, numerous specific details are set forth in the following detailed description. Those skilled in the art will understand that this disclosure can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art have not been described in detail in order to highlight the main points of this disclosure.

[0024] Please see Figure 1 , Figure 1 This is a schematic diagram illustrating an application environment according to an exemplary embodiment, such as... Figure 1 As shown, the application environment may include server 01 and terminal 02.

[0025] In an optional embodiment, server 01 can be used for computational processing in the noise reduction cavity control method. Specifically, server 01 can be a standalone physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, content delivery networks (CDNs), and big data and artificial intelligence platforms.

[0026] In an optional embodiment, terminal 02 can perform computational processing in conjunction with the noise reduction cavity control method of server 01. Specifically, terminal 02 can be, but is not limited to, electronic devices such as smartphones, desktop computers, tablets, laptops, smart speakers, digital assistants, augmented reality (AR) / virtual reality (VR) devices, and smart wearable devices. Optionally, the operating system running on the electronic device can be, but is not limited to, Android, iOS, Linux, Windows, and Unix systems.

[0027] For example, the noise information of the range hood fan is obtained through terminal 02 and transmitted to server 01; server 01 performs spectrum analysis on the noise information of the range hood fan to obtain noise spectrum data; energy ratio analysis is performed on the noise spectrum data to obtain the energy ratio information of the noise spectrum data within a preset frequency band, and sends it to terminal 02; if the energy ratio information exceeds the preset ratio, terminal 02 controls the variable plate structure to move vertically along the guide rail, and the movement is used to change the ratio of the expansion cavity and the fixed cavity inside the range hood.

[0028] In addition, it should be noted that, Figure 1 The example shown is merely one application environment provided by this disclosure; in practical applications, other application environments may also be included.

[0029] In the embodiments described in this specification, the server 01 and the terminal 02 can be directly or indirectly connected through wired or wireless communication, and this disclosure does not impose any restrictions.

[0030] Figure 2 This is a schematic diagram illustrating a noise reduction cavity control method according to an exemplary embodiment, such as... Figure 2 The noise reduction cavity control method shown is applied to a noise reduction system installed inside the range hood. The noise reduction system includes a fixed plate structure and a variable plate structure. The volume of the expansion cavity is positively correlated with the height of the variable plate structure extending beyond the fixed plate structure, and the volume of the fixed cavity is positively correlated with the height of the fixed plate structure. Both the expansion cavity and the fixed cavity are noise reduction cavities. The method includes: Step S201: Obtain the noise information of the range hood fan.

[0031] In this embodiment of the disclosure, the noise information of the range hood fan can be obtained by collecting the noise of the range hood fan through a microphone sensor in the inner cavity of the range hood.

[0032] Step S202: Perform spectrum analysis on the noise information of the range hood fan to obtain noise spectrum data.

[0033] In this embodiment of the disclosure, the noise information of the range hood fan is subjected to spectrum analysis to obtain noise spectrum data, including: Step S2021: Perform Fourier transform processing on the noise information of the range hood fan to obtain the noise self-power spectrum in the frequency domain.

[0034] In this embodiment of the disclosure, the collected noise information of the range hood fan is noise information in the time domain. After Fourier transform processing, it is transformed into noise information in the frequency domain, namely the noise self-power spectrum.

[0035] Step S2022: Determine the noise self-power spectrum as noise spectrum data.

[0036] As can be seen from the above, in this embodiment of the present disclosure, by performing spectrum analysis on the noise information of the range hood fan, noise spectrum data is obtained, which can transform the noise data in the time domain into noise data in the frequency domain, making it easier to further analyze the noise data and determine specific frequency bands, such as the mid-low frequency band.

[0037] Step S203: Perform energy proportion analysis on the noise spectrum data to obtain the energy proportion information of the noise spectrum data within the preset frequency band.

[0038] In this embodiment of the disclosure, energy proportion analysis is performed on the noise spectrum data to obtain energy proportion information of the noise spectrum data within a preset frequency band, including: Step S2031: Determine the target spectrum data, which is the spectrum data in the noise spectrum data that falls into the preset frequency band.

[0039] In this embodiment of the disclosure, the preset frequency band can be the mid-low frequency band or the low frequency band of noise. For example, if the preset frequency band is the low frequency band [x1,x2], then the spectrum data of the noise spectrum data that falls into the low frequency band [x1,x2] is determined as the target spectrum data.

[0040] Step S2032: Integrate the target spectrum data to obtain energy percentage information.

[0041] In this embodiment, the target spectrum data is first divided into several smaller frequency bands, and the frequency band division method can be selected according to specific needs. Energy proportion information is calculated by integrating and summing the spectral values ​​within each frequency band.

[0042] Based on the above, in this embodiment of the present disclosure, by determining the target spectrum data and performing integration processing on the target spectrum data to obtain energy proportion information, it is possible to understand the energy distribution of the signal at different frequencies, thereby identifying the main frequency components in the signal.

[0043] Step S204: When the energy ratio information exceeds the preset ratio, control the variable plate structure to move vertically along the guide rail. The movement is used to change the ratio of the expansion cavity to the fixed cavity inside the range hood.

[0044] In this embodiment of the disclosure, if the energy percentage information exceeds a preset percentage, it indicates that the data proportion within a preset frequency band in the noise is relatively high, requiring a larger cavity for noise reduction. Controlling the variable plate structure to move vertically along the guide rail includes: Step S2041: Perform sound pressure amplitude analysis on the target spectrum data to obtain target frequency band noise data. The target spectrum data is the spectrum data of the noise spectrum data that falls into the preset frequency band. The target frequency band noise data is the noise data at the point of maximum sound pressure amplitude in the noise frequency band corresponding to the target spectrum data.

[0045] In this embodiment of the disclosure, sound pressure amplitude analysis is performed on the target spectrum data to obtain the sound pressure amplitude within the frequency range of the target spectrum data, and the noise data corresponding to the maximum sound pressure amplitude is determined as the target frequency band noise data.

[0046] Step S2042: Determine the proportional information corresponding to the target frequency band noise data. The proportional information represents the ratio of the first height information to the second height information required to eliminate the target frequency band noise. The first height information is the height of the variable plate structure extending beyond the fixed plate structure, and the second height information is the height of the fixed plate structure.

[0047] In this embodiment of the disclosure, such as Figure 3 As shown, the first height information L1 is the height of the variable plate structure extending beyond the fixed plate structure, and the second height information L2 is the height of the fixed plate structure.

[0048] In this embodiment of the disclosure, determining the proportional information corresponding to the target frequency band noise data can be done by looking up the corresponding proportional information in a table based on the target frequency band noise data. This table represents the relationship between the frequency band noise data summarized from a large amount of experimental data and the ratio of the first height information and the second height information required to eliminate the noise in that frequency band.

[0049] Step S2043: Based on the proportional information, control the variable plate structure to move vertically along the guide rail to the position corresponding to the proportional information.

[0050] In this embodiment, a variable plate structure can be driven by a motor to move vertically along a guide rail to change the height of the variable plate structure extending beyond the fixed plate structure, thereby changing the ratio of the first height information to the second height information and adjusting the volume ratio between the expansion cavity and the fixed cavity to the corresponding position.

[0051] Based on the above, in this embodiment of the present disclosure, the target frequency band noise data is obtained by analyzing the sound pressure amplitude of the target spectrum data, and the sound pressure amplitude within the target spectrum data can be understood; by determining the proportional information corresponding to the target frequency band noise data, and controlling the variable plate structure to move vertically along the guide rail to the position corresponding to the proportional information based on the proportional information, the volume ratio between the expansion cavity and the fixed cavity can be adjusted to the corresponding position, thereby achieving noise elimination.

[0052] Figure 4 This is a block diagram illustrating a noise reduction cavity control device according to an exemplary embodiment. The device is applied to a noise reduction system installed inside a range hood. The noise reduction system includes a fixed plate structure and a variable plate structure. The volume of the expansion cavity is positively correlated with the height of the variable plate structure extending beyond the fixed plate structure, and the volume of the fixed cavity is positively correlated with the height of the fixed plate structure. Both the expansion cavity and the fixed cavity are noise reduction cavities. (Refer to...) Figure 4The device includes an acquisition module, a spectrum analysis module, an energy analysis module, and a control module, wherein... The acquisition module is used to acquire noise information of the range hood fan; The spectrum analysis module is used to perform spectrum analysis on the noise information of the range hood fan to obtain noise spectrum data; The energy analysis module is used to perform energy proportion analysis on noise spectrum data to obtain the energy proportion information of noise spectrum data within a preset frequency band. The control module is used to control the variable plate structure to move vertically along the guide rail when the energy ratio information exceeds the preset ratio. The movement is used to change the ratio of the expansion cavity to the fixed cavity inside the range hood.

[0053] In an optional embodiment, the control module includes: The sound pressure amplitude analysis module is used to perform sound pressure amplitude analysis on the target spectrum data to obtain the target frequency band noise data. The target spectrum data is the spectrum data of the noise spectrum data that falls into the preset frequency band, and the target frequency band noise data is the noise data at the point of maximum sound pressure amplitude in the noise frequency band corresponding to the target spectrum data. The ratio information module is used to determine the ratio information corresponding to the target frequency band noise data. The ratio information represents the ratio of the first height information and the second height information required to eliminate the target frequency band noise. The first height information is the height of the variable plate structure extending out of the fixed plate structure, and the second height information is the height of the fixed plate structure. The control submodule is used to control the variable plate structure to move vertically along the guide rail to the position corresponding to the proportional information, based on the proportional information.

[0054] In an optional embodiment, the energy analysis module includes: The target spectrum data module is used to determine the target spectrum data, which is the spectrum data of the noise spectrum data that falls into the preset frequency band; The integration processing module is used to perform integration processing on the target spectrum data to obtain energy percentage information.

[0055] In an optional embodiment, the spectrum analysis module includes: The Fourier transform processing module is used to perform Fourier transform processing on the noise information of the range hood fan to obtain the noise power spectrum in the frequency domain. The spectrum data determination module is used to determine the noise power spectrum as noise spectrum data.

[0056] In the embodiments of this application, the terms "module" or "unit" refer to a computer program or part of a computer program that has a predetermined function and works with other related parts to achieve a predetermined goal, and can be implemented wholly or partially using software, hardware such as processing circuitry or memory, or combinations thereof. Similarly, one or more processors or memories can be used to implement one or more modules or units. Furthermore, each module or unit can be part of an overall module or unit that includes the functionality of that module or unit.

[0057] In an exemplary embodiment, this disclosure also provides an electronic device, including: a processor; and a memory for storing processor-executable instructions; wherein the processor is used to execute the instructions to implement the noise-reducing cavity control method as described in the embodiments of this disclosure. The electronic device may be a terminal, and includes a processor, a memory, a network interface, a display screen, and an input device connected via a system bus. The processor of the electronic device provides computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The network interface of the electronic device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, it implements a noise-reducing cavity control method. The display screen of the electronic device may be a liquid crystal display screen or an electronic ink display screen. The input device of the electronic device may be a touch layer covering the display screen, or a button, trackball, or touchpad provided on the casing of the electronic device, or an external keyboard, touchpad, or mouse, etc.

[0058] In an exemplary embodiment, a storage medium is also provided, which, when the instructions in the storage medium are executed by the processor of an electronic device, enables the electronic device to perform the noise reduction cavity control method of the present disclosure embodiments.

[0059] In an exemplary embodiment, a computer program product containing instructions is also provided, which, when run on a computer, causes the computer to execute the noise reduction cavity control method of the present disclosure embodiments.

[0060] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. This computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this disclosure can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM), etc.

[0061] This disclosure also provides a noise reduction system for implementing the above-described noise reduction cavity control method, such as... Figure 5 As shown, the noise reduction system includes: a first moving structure 1 and a second moving structure 2; the first moving structure 1 is installed on the inner wall of one side of the range hood cavity, and the second moving structure 2 is installed on the inner wall of the other side of the range hood cavity. The target moving structure includes a fixed plate structure 3 and a variable plate structure 4. The target moving structure is any one of the first moving structure 1 and the second moving structure 2. The variable plate structure 4 moves vertically.

[0062] In this embodiment, the front panel, left side panel, right side panel, and rear panel of the range hood casing together form the range hood cavity. The first movable structure 1 is installed on the inner wall of the left side panel, and the second movable structure 2 is installed on the inner wall of the right side panel. The first movable structure 1 and the second movable structure 2 contain the same components, both including a fixed plate structure 3 and a variable plate structure 4. The first movable structure 1 and the second movable structure 2 are symmetrically arranged along the centerline of the range hood casing.

[0063] like Figure 6 As shown, the fixing plate structure 3 includes a first fixing plate 301 and a second fixing plate 302. The first fixing plate 301 is fixed to the side wall of the range hood, and the second fixing plate 302 is fixed to the rear wall of the range hood. The first fixing plate 301 and the second fixing plate 302 are arranged opposite to each other.

[0064] In this embodiment, both sides of the first fixing plate 301 are flat, and one of the flat sides is fixed to the left side wall of the range hood. Both sides of the second fixing plate 302 are flat, and its edge is fixed to the rear side wall of the range hood. The first fixing plate 301 and the second fixing plate 302 are arranged opposite each other at a certain distance. The first fixing plate 301 and the second fixing plate 302 of the same moving structure are both located on the same side of the range hood.

[0065] like Figure 6 As shown, the variable plate structure 4 includes a variable plate 401, which is located between the first fixed plate 301 and the corresponding side wall of the range hood.

[0066] In this embodiment, both sides of the variable plate 401 are planes, with one side of the plane located between the first fixed plate 301 and the corresponding side wall of the range hood. The variable plate 401 can move vertically between the first fixed plate 301 and the corresponding side wall of the range hood.

[0067] A fixed cavity is formed between the second fixed plate 302 of the first movable structure 1 and the second fixed plate 302 of the second movable structure 2; an expansion cavity is formed between the variable plate 401 of the first movable structure 1 and the variable plate 401 of the second movable structure 2.

[0068] In this embodiment, the front and rear panels of the range hood, the second fixed plate 302 of the first movable structure 1, and the second fixed plate 302 of the second movable structure 2 together form a fixed cavity. The width of the fixed cavity is approximately equal to the distance between the second fixed plates 302 of the first movable structure 1 and the second fixed plate 302 of the second movable structure 2. The front and rear panels of the range hood, the variable plate 401 of the first movable structure 1, and the variable plate 401 of the second movable structure 2 together form an expansion cavity. The width of the expansion cavity is approximately equal to the distance between the variable plates 401 of the first movable structure 1 and the variable plates 401 of the second movable structure 2.

[0069] In an optional embodiment, such as Figure 6 As shown, the variable plate structure 4 also includes: a perforated plate 402; the perforated plate 402 is attached to the second fixed plate 302, and the perforated plate 402 is arranged opposite to the variable plate 401.

[0070] In this embodiment, the perforated plate 402 is provided with a plurality of through holes for communicating with the gas inside the cavity. The edge of the perforated plate 402 is fixed to the rear plate of the range hood. Both sides of the perforated plate 402 are flat, one side is attached to the second fixed plate 302, and the other side is opposite to the variable plate 401.

[0071] In this embodiment of the disclosure, the above-mentioned noise reduction cavity can be moved by setting the range hood shell as a double-layer structure, which includes an outer shell and an inner shell. The variable plate structure 4 is fixed on the inner shell, and the fixed plate structure 3 is fixed on the outer shell. When the variable plate structure 4 moves, it can drive the inner shell to move in the vertical direction at the same time, so that a height difference is formed between the inner shell and the outer shell, thereby increasing the volume of the range hood cavity and thus increasing the volume of the expansion cavity.

[0072] In an optional embodiment, such as Figure 6 As shown, the perforated plate 402 is also provided with a cavity channel 403, which is used to connect the expansion cavity.

[0073] In this embodiment of the present disclosure, a cavity channel 403 is provided on the perforated plate 402 near the rear wall of the range hood. The cavity channel is square and is used to circulate air within the cavity.

[0074] In an optional embodiment, such as Figure 6 As shown, the target moving structure also includes: motor 5; motor 5 is fixed on the rear wall of the range hood cavity, and motor 5 is used to drive the variable plate structure 4 to move vertically along the slide rail.

[0075] In this embodiment, the motor 5 is installed on the rear wall of the range hood between the variable plate 401 and the perforated plate 402 of the variable plate structure 4, and can drive the variable plate 401 and the perforated plate 402 of the variable plate structure 4 to move vertically along the guide rail.

[0076] This disclosure also provides a range hood including the aforementioned noise reduction system.

[0077] In this embodiment of the disclosure, the range hood may be a top-mounted range hood.

[0078] This disclosure also provides an integrated cooktop including the aforementioned noise reduction system.

[0079] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims.

[0080] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A method for controlling a noise reduction cavity, characterized in that, The method is applied to a noise reduction system installed inside a range hood. The noise reduction system includes a fixed plate structure and a variable plate structure. The volume of the expansion cavity is positively correlated with the height of the variable plate structure extending beyond the fixed plate structure, and the volume of the fixed cavity is positively correlated with the height of the fixed plate structure. Both the expansion cavity and the fixed cavity are noise reduction cavities. Obtain noise information from the range hood fan; The noise spectrum information of the range hood fan is analyzed to obtain noise spectrum data; Energy proportion analysis is performed on the noise spectrum data to obtain the energy proportion information of the noise spectrum data within a preset frequency band; When the energy ratio information exceeds the preset ratio, sound pressure amplitude analysis is performed on the target spectrum data to obtain target frequency band noise data. The target spectrum data is the spectrum data of the noise spectrum data that falls into the preset frequency band. The target frequency band noise data is the noise data at the point of maximum sound pressure amplitude in the noise frequency band corresponding to the target spectrum data. Determine the proportional information corresponding to the target frequency band noise data. The proportional information represents the ratio of the first height information to the second height information required to eliminate the target frequency band noise. The first height information is the height of the variable plate structure extending beyond the fixed plate structure, and the second height information is the height of the fixed plate structure. Based on the proportional information, the variable plate structure is controlled to move vertically along the guide rail to the position corresponding to the proportional information.

2. The noise reduction cavity control method according to claim 1, characterized in that, The step of performing energy proportion analysis on the noise spectrum data to obtain the energy proportion information of the noise spectrum data within a preset frequency band includes: Determine the target spectrum data, which is the spectrum data of the noise spectrum data that falls within the preset frequency band; The energy percentage information is obtained by integrating the target spectrum data.

3. The noise reduction cavity control method according to claim 1, characterized in that, The step of performing spectral analysis on the noise information of the range hood fan to obtain noise spectrum data includes: The noise information of the range hood fan is subjected to Fourier transform processing to obtain the noise self-power spectrum in the frequency domain; The noise power spectrum is determined as the noise spectrum data.

4. A noise reduction system, characterized in that, The noise reduction system is used to implement the noise reduction cavity control method as described in any one of claims 1-3, and the noise reduction system includes: a first moving structure (1) and a second moving structure (2). The first moving structure (1) is installed on the inner wall of one side of the range hood cavity, and the second moving structure (2) is installed on the inner wall of the other side of the range hood cavity. The target moving structure includes a fixed plate structure (3) and a variable plate structure (4). The target moving structure is any one of the first moving structure (1) and the second moving structure (2). The variable plate structure (4) moves vertically. The fixing plate structure (3) includes a first fixing plate (301) and a second fixing plate (302). The first fixing plate (301) is fixed to the side wall of the range hood, and the second fixing plate (302) is fixed to the rear wall of the range hood. The first fixing plate (301) and the second fixing plate (302) are arranged opposite to each other. The variable plate structure (4) includes a variable plate (401), which is located between the first fixed plate (301) and the corresponding side wall of the range hood. A fixed cavity is formed between the second fixed plate (302) of the first movable structure (1) and the second fixed plate (302) of the second movable structure (2). An expansion cavity is formed between the variable plate (401) of the first moving structure (1) and the variable plate (401) of the second moving structure (2).

5. The noise reduction system according to claim 4, characterized in that, The variable plate structure (4) further includes: a perforated plate (402); The perforated plate (402) is attached to the second fixed plate (302), and the perforated plate (402) is disposed opposite to the variable plate (401).

6. The noise reduction system according to claim 5, characterized in that: The perforated plate (402) is also provided with a cavity channel (403), which is used to connect the expansion cavity.

7. The noise reduction system according to claim 4, characterized in that, The target moving structure also includes: a motor (5); The motor (5) is fixed on the rear wall of the range hood cavity, and the motor (5) is used to drive the variable plate structure (4) to move vertically along the slide rail.

8. A range hood, characterized in that: Including the noise reduction system as described in any one of claims 4-7.

9. An integrated stove, characterized in that: Including the noise reduction system as described in any one of claims 4-7.

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