Integrated stove and air duct system, control method

Abstract

The present disclosure relates to an integrated cooker and an air duct system, a control method, the air duct system comprising an air duct structure and a fan system arranged in the air duct structure, the fan system comprising a motor; the air duct system further comprises: a vibration detection module for detecting a vibration signal of the motor; a noise detection module for detecting a noise signal of the air duct structure and the fan system; a distance measurement module arranged at a head of an integrated cooker where the air duct system is located, for detecting a distance between a user and the integrated cooker; a control module in communication connection with the vibration detection module, the noise detection module, the distance measurement module and the motor respectively, the control module acquiring detection results of the vibration detection module, the noise detection module and the distance measurement module, and controlling a rotating speed of the motor. The present disclosure can control the rotating speed of the motor in real time according to noise energy and user distance, so as to avoid that a user perceives too large noise when using the integrated cooker.

Description

Technical Field

[0001] This disclosure relates to the field of integrated stove technology, and in particular to an integrated stove and its air duct system and control method. Background Technology

[0002] An integrated cooktop is a kitchen appliance that combines multiple functions such as a range hood, gas stove, disinfection cabinet, and storage cabinet. One of the problems with current integrated cooktop products is that the noise generated by the fan in the air duct system is concentrated through the air duct structure and propagated directionally from the air intake, thus affecting the user's cooking experience. Summary of the Invention

[0003] In order to solve at least one of the technical problems mentioned above, this disclosure proposes an integrated stove and air duct system, and a control method.

[0004] According to some embodiments of this disclosure, a duct system is provided, disposed in an integrated stove. The duct system includes a duct structure and a fan system disposed within the duct structure. The fan system includes a motor. The duct system further includes: a vibration detection module disposed in the fan system for detecting vibration signals of the motor; a noise detection module disposed in the duct structure and the fan system for detecting noise signals of the duct structure and the fan system; a distance measuring module disposed at the head of the integrated stove where the duct system is located for detecting the distance between the user and the integrated stove; and a control module communicatively connected to the vibration detection module, the noise detection module, the distance measuring module, and the motor, respectively. The control module acquires the detection results of the vibration detection module, the noise detection module, and the distance measuring module, and controls the rotational speed of the motor.

[0005] Based on the above solution, noise and vibration signals of the duct structure and fan system can be obtained. The obtained signals can be used to determine whether the fan operation is abnormal and to calculate the system noise energy of the duct system. Based on the noise energy and the distance between the user and the integrated stove, the motor speed can be controlled in real time to avoid the user perceiving excessive noise during the use of the integrated stove, thereby improving the user experience.

[0006] In some possible implementations, the fan system further includes a volute, an impeller, and a motor bracket. The volute is located inside the duct structure, the impeller is rotatably disposed within the volute, the motor is mounted on the volute and its power output end is connected to the impeller drive, the motor is used to drive the impeller to rotate, and the motor bracket is used to connect the motor and the duct structure; the vibration detection module is disposed on the motor bracket.

[0007] Based on the above scheme, the vibration detection module is installed on the motor bracket. The vibration signal detected by the vibration detection module can reflect both the operating status of the motor and the overall operating status of the fan system.

[0008] In some possible implementations, the volute includes a front cover, a rear cover, an upper ring wall, and a lower ring wall. The noise detection module is respectively installed at the positions of the front cover near the outlet of the volute, the rear cover near the outlet of the volute, the upper ring wall near the outlet of the volute, and the lower ring wall near the outlet of the volute. The positions of the upper ring wall near the outlet of the volute and the lower ring wall near the outlet of the volute correspond to each other.

[0009] Based on the above scheme, by setting noise detection modules at different positions on the volute, the accuracy of noise detection can be improved and the error caused by local noise fluctuations can be reduced.

[0010] In some possible implementations, the air duct structure includes a front plate, a rear plate, a left side plate, a right side plate, a bottom plate, and a cover plate. The noise detection module is respectively provided on the front plate, the front plate, and the bottom plate. The position of the noise detection module on the front plate corresponds to the position of the noise detection module on the front cover, the rear plate corresponds to the position of the noise detection module on the rear cover, and the bottom plate corresponds to the position of the noise detection module on the lower ring wall.

[0011] Based on the above scheme, by setting noise detection modules at different locations in the duct structure, and ensuring that the noise detection locations in the duct structure correspond to the noise detection locations in the fan system, the accuracy of noise detection is further improved.

[0012] According to other embodiments of this disclosure, an integrated cooktop is provided, which further includes an air duct structure as described in any of the above embodiments.

[0013] According to some other embodiments of this disclosure, a duct system control method is provided, applied to a duct structure as described in any of the above embodiments. The method includes: acquiring the excitation frequency of a motor in the duct system; acquiring vibration and noise signals of the motor, and extracting motor vibration parameters and motor noise parameters; acquiring noise signals of the duct structure in the duct system, and extracting duct noise parameters; determining the system noise energy of the duct system based on the motor vibration parameters, the motor noise parameters, and the duct noise parameters; acquiring a user distance, the user distance indicating the length of the user from the center of the integrated stove; and determining the rotational speed of the motor based on the system noise energy and the user distance.

[0014] Based on the above solution, the system noise energy of the air duct system can be determined according to the detected vibration and noise signals, and the motor speed can be controlled in real time according to the user distance to ensure that the user perceives less noise when using the integrated stove, thereby improving the user experience.

[0015] In some possible implementations, determining the system noise energy of the duct system based on the motor vibration parameters, the motor noise parameters, and the duct noise parameters includes: dividing the duct system into at least two sound propagation regions; determining the total regional noise of each of the sound propagation regions based on the motor vibration parameters, the motor noise parameters, and the duct noise parameters; determining the total system noise of the duct system based on the total regional noise of each of the sound propagation regions; and converting the total system noise into an energy representation to obtain the system noise energy.

[0016] Based on the above scheme, dividing the duct system into multiple sound propagation zones can avoid inaccurate measurement of the total system noise caused by local noise measurement errors, thereby improving the accuracy of system control.

[0017] In some possible implementations, noise detection modules are respectively provided on the front plate, rear plate, and bottom plate of the air duct structure in the air duct system, and noise detection modules are respectively provided on the front cover, rear cover, upper ring wall, and lower ring wall of the volute in the air duct system; dividing the air duct system into at least two sound propagation regions includes: dividing the sound propagation region between the rear cover and the rear plate into a first propagation region; dividing the sound propagation region between the front cover and the front plate into a second propagation region; dividing the sound propagation region corresponding to the volute outlet into a third propagation region; and dividing the sound propagation region between the lower ring wall and the bottom plate into a fourth propagation region.

[0018] Based on the above scheme, the sound propagation area of ​​the duct system is divided according to the correspondence between the duct structure and the fan system, so that the divided sound propagation area is closer to the actual sound propagation path, thereby making the calculation of the total noise of the system more accurate.

[0019] In some possible implementations, determining the total regional noise of each sound propagation region based on the motor vibration parameters, the motor noise parameters, and the duct noise parameters includes: for any sound propagation region, obtaining the peak noise of the plate component detected at the duct structure position corresponding to the sound propagation region, and obtaining the peak noise of the volute detected at the volute position corresponding to the sound propagation region; performing sound superposition processing based on the peak noise of the plate component and the peak noise of the volute to obtain the total regional noise of the sound propagation region.

[0020] Based on the above scheme, noise is detected in the air duct structure and the volute separately, and the sound superposition processing is used to avoid the inaccuracy of noise detection at a single location, thereby further reducing the error caused by noise detection.

[0021] In some possible implementations, the method further includes: acquiring plate parameters of the duct system; determining acoustic energy loss based on the plate parameters and the excitation frequency; and correcting the system noise energy based on the acoustic energy loss.

[0022] Based on the above scheme, the process loss of sound energy in the duct system that propagates to the human ear can be obtained. The system noise energy corrected by the sound energy loss is more in line with the actual noise level perceived by the user, thereby achieving precise control and improving the user experience.

[0023] In some possible implementations, the method further includes: determining the abnormal occurrence state of the fan system and the abnormal occurrence state of the motor based on the motor vibration parameters, the motor noise parameters, and the excitation frequency.

[0024] Based on the above scheme, the matching relationship between the motor vibration frequency, the maximum noise frequency and the excitation frequency can be used to determine whether the fan system structure is abnormal and whether the motor is damaged.

[0025] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure.

[0026] 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

[0027] To more clearly illustrate the technical solutions and advantages in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A rear view schematic diagram of the volute structure in an air duct system according to an embodiment of the present disclosure is shown.

[0029] Figure 2 A schematic front view of the volute in an air duct system according to an embodiment of the present disclosure is shown.

[0030] Figure 3 A three-dimensional structural schematic diagram of the volute in an air duct system according to an embodiment of the present disclosure is shown;

[0031] Figure 4 A schematic diagram of a duct structure according to an embodiment of the present disclosure is shown;

[0032] Figure 5 A flowchart illustrating a wind turbine system control method according to an embodiment of the present disclosure is shown;

[0033] Figure 6 A flowchart is shown to determine the system noise energy of the air duct system.

[0034] In the picture,

[0035] 1-Vortex casing; 11-Front cover; 12-Rear cover; 13-Upper ring wall; 14-Lower ring wall; 2-Motor; 3-Motor bracket; 4-Air duct structure; 41-Front plate; 42-Rear plate; 43-Bottom plate. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] Various exemplary embodiments, features, and aspects of this disclosure will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Integrated cooktops are common household appliances in home kitchens, combining the functions of a range hood, cooktop, and disinfection cabinet into one unit. They save kitchen space and are therefore increasingly popular. The range hood system of an integrated cooktop mainly consists of an air duct and a fan system. The air duct includes front and rear panels, left and right side panels, a bottom plate, and a top cover. The fan system is installed on the front and rear panels via mounting points. After the power is turned on, the motor drives the impeller to rotate at high speed, causing the fumes to enter the air duct. Simultaneously, an air pressure difference is created between the inside and outside of the air inlet and outlet, allowing the fumes to rotate and accelerate along with the air inside the volute, eventually being exhausted through the flue to a common flue or outdoors. During the fume extraction process, some high-temperature oil particles in the fumes are thrown onto the inner wall of the volute by the centrifugal force of the impeller, condensing into oil droplets that flow back to the oil collection device on the bottom plate under gravity.

[0043] When the motor is powered on, the shaft rotates, driving the impeller to rotate within the volute. The motor's excitation is transmitted to the impeller, and the rotation itself is also a form of noise excitation. Thus, noise is generated and propagates within the fan system. In integrated cooktops, the fan system is installed within an air duct, a narrow channel-like structure with only one open inlet. This channel-like structure has a noise-gathering effect, focusing the sound within the duct and directing it out through the air inlet, making it audible to the user and affecting their cooking experience.

[0044] To address the aforementioned technical problems, this disclosure provides an air duct system, please refer to... Figures 1-4The air duct system is installed in the integrated stove. The system includes an air duct structure 4 and a fan system within the air duct structure 4, with the fan system including a motor 2. The system also includes: a vibration detection module located in the fan system to detect vibration signals from the motor 2; a noise detection module located in both the air duct structure 4 and the fan system to detect noise signals from both; a distance measuring module located at the head of the integrated stove where the air duct system is located to detect the distance between the user and the stove; and a control module that is communicatively connected to the vibration detection module, noise detection module, distance measuring module, and motor 2. The control module acquires the detection results from these modules and controls the speed of the motor 2. Based on this configuration, the air duct system, by setting up multiple detection modules, can detect vibration data from the motor 2 and noise data from the air duct structure 4, calculate the noise energy that the user can perceive when using the integrated stove, and control the speed of the motor 2 based on the user's distance, thereby achieving real-time frequency conversion noise reduction.

[0045] In this disclosed embodiment, please refer to Figures 1-3 The fan system within the duct structure 4 also includes a volute 1, an impeller, and a motor bracket 3. The volute 1 is located inside the duct structure 4, and the impeller is rotatably mounted within it. The motor 2 is mounted on the volute 1, and its power output is connected to the impeller drive. The motor 2 drives the impeller to rotate. The motor bracket 3 connects the motor 2 and the duct structure 4. A vibration detection module is mounted on the motor bracket 3. In the integrated stove, the main sources of normal noise are the rotation noise of the motor 2 and the impeller in the fan system. When the motor 2 is running, it transmits vibrations through the motor bracket 3 to other mechanical components, such as the volute 1 and the plates of the duct structure 4. Therefore, assuming there are no abnormalities in the motor 2 and the mechanical structures connected to it, the vibration signal detected on the motor bracket 3 can be used to extract the vibration data of the motor 2. This vibration data corresponds to the noise data of the motor 2 and the noise data of the duct system. Based on this correspondence, the detected vibration signal can be used to determine whether the operating state of the motor 2 is abnormal and whether the system structure is abnormal.

[0046] In this embodiment, noise is generated by the motor 2 and impeller at the inlet of the volute 1 and spreads through the volute 1. Since there is a gap between the volute 1 and the air duct structure 4, which is an ideal sound propagation area, the air duct system of this disclosure detects the noise at the volute 1 and the air duct structure 4 respectively, thereby accurately obtaining the total noise situation in the air duct structure 4 and the regional noise situation in each area.

[0047] In some possible embodiments, please refer to Figures 1-3The volute 1 includes a front cover 11, a rear cover 12, an upper annular wall 13, and a lower annular wall 14. Noise detection modules are respectively installed at positions near the outlet of the volute 1 on the front cover 11, the rear cover 12, the upper annular wall 13, and the lower annular wall 14. The positions of the upper annular wall 13 and the lower annular wall 14 near the outlet correspond to each other. In this embodiment, the purpose of placing multiple noise detection modules near the outlet of the volute 1 is that the airflow impact at the outlet of the volute 1 generates additional impact noise; that is, the noise near the outlet of the volute 1 is greater, thus more accurately reflecting the peak noise level inside the volute 1.

[0048] Based on the above embodiments, Figure 4 A schematic diagram of a duct structure according to an embodiment of the present disclosure is shown. Please refer to... Figure 2 The air duct structure 4 includes a front plate 41, a rear plate 42, a left side plate, a right side plate, a bottom plate 43, and a cover plate. Noise detection modules are respectively installed on the front plate 41, rear plate 42, and bottom plate 43. The positions of the noise detection modules on the front plate 41 correspond to the positions of the noise detection modules on the front cover 11, the rear plate 42 corresponds to the positions of the noise detection modules on the rear cover 12, and the bottom plate 43 corresponds to the positions of the noise detection modules on the lower ring wall 14. In this embodiment, the positions of the noise detection modules on the air duct structure 4 correspond to the positions of the noise detection modules on the volute 1, meaning that the noise detected by the noise detection modules on the volute 1 corresponds to the air duct noise, making the total noise within the air duct processed by the control module more accurate.

[0049] Embodiments of this disclosure also provide an integrated stove, including the air duct system described in any of the above embodiments.

[0050] The embodiments of this disclosure also provide a duct system control method, applied to a duct system as described in any of the above embodiments. Figure 5 A flowchart illustrating a wind turbine system control method according to an embodiment of this disclosure is provided. Figure 5 The control method for this fan system includes:

[0051] S101. Obtain the excitation frequency of the motor 2 in the air duct system;

[0052] S102. Obtain the vibration signal and noise signal of the motor 2, and extract the vibration parameters and noise parameters of the motor 2;

[0053] S103. Obtain the noise signal of the air duct structure 4 in the air duct system and extract the air duct noise parameters;

[0054] S104. Determine the system noise energy of the air duct system based on the vibration parameters of the motor 2, the noise parameters of the motor 2, and the noise parameters of the air duct;

[0055] S105. Obtain the user distance, wherein the user distance indicates the length of the user's distance from the center of the integrated stove;

[0056] S106. Determine the rotational speed of the motor 2 based on the system noise energy and the user distance.

[0057] Based on the above method steps, the duct system can determine the system noise energy of the duct system according to the detected vibration and noise signals, and control the speed of motor 2 in real time according to the user distance, ensuring that the user perceives low noise when using the integrated stove, thereby improving the user experience. Since the noise energy in this embodiment is calculated based on vibration and noise data within the duct system, there is no need to install additional noise sensors on the outer shell of the integrated stove. The calculated noise energy is updated in real time according to changes in the detected signals, resulting in high detection sensitivity. Furthermore, the vibration and noise data within the duct system can also reflect the operating status of the internal structure of the duct system, allowing the control module to issue timely alarms to prompt cleaning or maintenance of the integrated stove.

[0058] In this embodiment, the vibration signal and noise signal are acquired by a vibration detection module and a noise detection module respectively mounted on the motor bracket 3. The vibration parameters of the motor 2 include the vibration amplitude and vibration frequency, and the noise parameters include the maximum noise peak value and the corresponding noise peak frequency. Acquiring both the vibration signal and the noise signal is based on the premise that the motor 2 rotates at a stable speed. This embodiment does not limit the extraction method of the motor 2 vibration parameters and motor 2 noise parameters; that is, the motor 2 vibration parameters and / or motor 2 noise parameters can be instantaneous sampled data or averaged data over a fixed time interval.

[0059] Based on the above embodiments, in a specific implementation, after the speed of motor 2 stabilizes, the vibration signal and noise signal of motor 2 within 10 seconds are collected, and the average vibration amplitude and average vibration frequency within the 10 seconds are extracted as vibration parameters of motor 2; the maximum noise peak value and the corresponding noise peak frequency within the 10 seconds are extracted as noise parameters of motor 2.

[0060] Based on the above embodiments, in another specific implementation, the abnormal state of the fan system and the abnormal state of the motor 2 are determined by comparing the excitation frequency, vibration frequency, and noise peak frequency of the motor 2. When the vibration frequency of the motor 2 is equal to the excitation frequency of the motor 2, and when the vibration frequency of the motor 2 is not equal to the noise peak frequency, it is determined that the fan system structure is abnormal, and the control module issues an alarm, suggesting that the user clean or replace the motor 2. When the vibration frequency of the motor 2 is not equal to the excitation frequency of the motor 2, it is determined that the excitation of the motor 2 is abnormal, and the control module issues an alarm, reminding the user to carry out warranty repairs.

[0061] As can be seen from the above embodiments, the fan system is assembled inside the duct, which is a narrow channel-type structure with only one open inlet. This channel-type structure has a noise-gathering effect, concentrating sound within the duct and directing it outwards from the inlet. The noise is mainly generated by the motor 2 and impeller at the inlet of the volute 1 and propagates through the volute 1. Since there is a gap between the volute 1 and the duct structure 4, this gap is an ideal sound propagation area. Therefore, in order to improve the accuracy of the final obtained system noise energy, the duct system control method of this disclosure incorporates the actual sound propagation area into the calculation steps when determining the system noise energy based on noise and vibration signals.

[0062] Figure 6 The flowchart for determining the system noise energy of the duct system is shown below. Please refer to it. Figure 4 The steps for determining system noise energy include:

[0063] S201. Divide the air duct system into at least two sound propagation zones.

[0064] In this embodiment, the at least two sound propagation regions include the sound propagation region corresponding to the outlet of the volute 1 and the sound propagation region formed by the gap between the volute 1 and the air duct structure 4. The sound propagation region corresponding to the outlet of the volute 1 has a higher noise level, while the sound propagation region formed by the gap between the volute 1 and the air duct structure 4 has a lower noise level. Detecting the noise level in the corresponding regions based on the defined sound propagation regions allows for subsequent calculations of system noise energy that are closer to the actual values.

[0065] Based on the above division scheme, in one embodiment of this disclosure, the gap between the volute 1 and the air duct structure 4 can be further divided. Since the air duct structure 4 includes a front plate 41, a rear plate 42, a left side plate, a right side plate, a bottom plate 43, and a cover plate, and the volute 1 includes a front cover 11, a rear cover 12, an upper annular wall 13, and a lower annular wall 14, the air duct system can be divided into four sound propagation regions, including:

[0066] The sound propagation area between the rear cover 12 and the rear panel 42 is defined as the first propagation area;

[0067] The sound propagation area between the front cover 11 and the front panel 41 is divided into the second propagation area;

[0068] The acoustic propagation region corresponding to the outlet of volute 1 is designated as the third propagation region;

[0069] The acoustic propagation area between the lower ring wall 14 and the base plate 43 is designated as the fourth propagation area.

[0070] It should be understood that the division of sound propagation zones is related to the structure of the duct system. The significance of the above four sound propagation zone division schemes lies in the fact that the integrated stove's spatial compression of the duct structure 4 results in smaller gaps between the rear cover 12 and the rear plate 42, the front cover 11 and the front plate 41, and the lower ring wall 14 and the bottom plate 43. These gaps are considered as three independent gaps, thus dividing the space into three different sound propagation zones. If the above three gaps are all large and connected, then a two-sound-propagation-zone division scheme can be adopted.

[0071] S202. Determine the total regional noise of each sound propagation area based on the vibration parameters of motor 2, the noise parameters of motor 2, and the noise parameters of the air duct.

[0072] In this embodiment of the disclosure, the premise for determining the total regional noise of each sound propagation region is that neither the fan system nor the motor 2 malfunctions, i.e., the excitation frequency of the motor 2, the vibration frequency of the motor 2, and the peak noise frequency are all equal. Based on this condition, the steps for determining the total regional noise of each sound propagation region include:

[0073] S301. For any sound propagation area, obtain the peak noise of the plate detected at the position of the air duct structure 4 corresponding to the sound propagation area, and obtain the peak noise of the volute 1 detected at the position of the volute 1 corresponding to the sound propagation area.

[0074] S302. Based on the noise peak of the plate and the noise peak of the volute 1, perform sound superposition processing to obtain the total regional noise of the sound propagation area.

[0075] In this embodiment of the disclosure, the total regional noise of any sound propagation area is considered to be obtained by superimposing the noise peak of the plate and the noise peak of the volute 1, that is, it is considered to be the superposition of two noise signals. The principle of sound superposition processing is to convert the noise signals to be superimposed into power and add them together, and then convert them into decibels.

[0076] In one specific implementation, the air duct system is divided into four sound propagation zones. The total noise level of the sound propagation zone between the front cover 11 and the front panel 41 is calculated as follows: the peak noise level of the front panel 41 of the air duct structure 4 is A. ff The peak noise level of the volute 1 in the front cover 11 of the Ouke area is A. sf , when A ff=A sf When the summation is complete, the total noise in the region is: When A ff >A sf orA ff sf When the summation is complete, the total noise in the region is:

[0077] S203. Determine the total system noise of the duct system based on the total regional noise of each sound propagation area.

[0078] In this embodiment of the disclosure, the total system noise of the air duct system is also obtained by superimposing the total regional noise of each sound propagation area.

[0079] In one specific implementation, the duct system is divided into four sound propagation zones: the first propagation zone, the second propagation zone, the third propagation zone, and the fourth propagation zone, with corresponding total noise levels of A0 and A1 respectively. p1 A p2 A p3 A p4 The total noise peak value for the four regions is: A z That is, the total system noise of the air duct system.

[0080] S204. Convert the total system noise into an energy representation to obtain the system noise energy.

[0081] In this embodiment, the system noise energy is obtained based on the sound energy conversion formula, and the total system noise of the duct system is A. z Then the corresponding system noise energy is: Where v is the volume of the air duct structure 4, ρ is the air density, and c0 is the speed of sound.

[0082] In this embodiment, the system noise energy is obtained by processing noise data within the duct structure 4. However, during actual propagation, the noise within the duct structure 4 is blocked, reflected, and absorbed by the mechanical components within the duct structure 4. In other words, the aforementioned system noise energy is larger than the noise level perceived by the human ear. Therefore, to avoid performance degradation due to over-control, it is necessary to correct the system noise energy. The correction methods include:

[0083] S401. Obtain the panel parameters of the air duct system;

[0084] S402. Determine the sound energy loss based on the plate parameters and excitation frequency;

[0085] S403. Correct the system noise energy based on the loss of sound energy.

[0086] ​In this embodiment, the correction of system noise energy is mainly achieved by calculating the loss during the transmission of sound energy to the human ear. The loss includes two parts: radiation loss from the plates inside the air duct and propagation path loss, with corresponding loss coefficients as follows: Where α is the radiation coefficient of the plate, typically ranging from 0.6 to 0.8, f is the excitation frequency, and ρ... p Let E be the density of the board. Based on the above scheme, the corrected system noise energy is: E r = (1-ε-χ)*E.

[0087] To more clearly explain the duct system control method disclosed herein, a complete implementation process is provided below. This method is applied to... Figure 1 In the illustrated duct system, the gap between the duct structure 4 and the volute 1 is small. The duct system can be divided into four sound propagation regions: the first region is defined as the sound propagation region between the rear cover 12 and the rear plate 42; the second region is defined as the sound propagation region between the front cover 11 and the front plate 41; the third region is defined as the sound propagation region corresponding to the outlet of the volute 1; and the fourth region is defined as the sound propagation region between the lower ring wall 14 and the bottom plate 43. The fan system control method includes:

[0088] After the user starts the range hood function of the integrated stove and selects the operating level, the control module collects the excitation frequency f1 of motor 2 at that level;

[0089] After the motor 2 has been running at a stable speed for about 10 seconds, the vibration detection module on the motor bracket 3 acquires the vibration signal, the noise detection module on the motor bracket 3 acquires the noise signal, and the control module extracts the vibration frequency f and vibration amplitude v of the motor 2 based on the vibration signal and noise signal, and extracts the maximum noise peak As and the corresponding noise peak frequency fs of the noise signal.

[0090] The control module determines whether the following conditions are met: f = f1 = f s If the condition is met, proceed to the next step; otherwise, continue to judge. If f = f1, it is judged that the structure of the fan system is abnormal, and the control module issues an alarm prompt, suggesting that the user clean or replace it; if f ≠ f1, it is judged that the excitation of motor 2 is abnormal, and the control module issues an alarm prompt, reminding the user to repair it.

[0091] The noise detection module acquires noise signals at different locations of the air duct structure 4, and the control module obtains the maximum peak noise value Af at different locations of the air duct structure 4, which are denoted as: Air duct front panel 41A ff Air duct back panel 42A fb 43A air duct base plate fd ;

[0092] The noise detection module acquires noise signals at different locations of the volute 1, and the control module obtains the noise peak values ​​at different locations of the volute 1, specifically the noise peak values ​​of four regions: the front cover 11, the rear cover 12, the upper ring wall 13, and the lower ring wall 14 of the volute 1, denoted as: A sf A sb A ss A sx ;

[0093] Calculate the total regional noise in the first, second, and fourth propagation regions respectively. Taking the second propagation region as an example, when A... ff =A sf When the total regional noise of the second propagation region is... When A ff >A sf orA ff sf When the total regional noise of the second propagation region is... Similarly, the total regional noise A in the first and fourth propagation regions can be obtained. p1 A p4 ;

[0094] Calculate the total regional noise in the third propagation region, when A sf =A sb =A ss =A sx When the total regional noise of the second propagation region is A, then the total regional noise of the second propagation region is A. p3 =A sf +10lg4, otherwise, the total noise in the second propagation region is

[0095] The total noise peak value for the four regions is calculated as follows: A z That is, the total system noise of the air duct system;

[0096] Convert sound signal Az into sound energy This yields the acoustic energy within the duct, where v is the volume of duct structure 4, ρ is the air density, and c0 is the speed of sound.

[0097] The calculation of sound energy propagation within an air duct involves losses in the human ear, comprising two parts: radiation loss from the duct's components and propagation path loss; these are denoted as: Where α is the radiation coefficient of the plate, typically ranging from 0.6 to 0.8, f is the excitation frequency, and ρ... p The density of the sheet metal;

[0098] Calculate the acoustic energy propagating from the import area: E r = (1-ε-χ)*E;​

[0099] The distance measuring module detects the distance L between the user and the center of the integrated stove. If L is less than the preset distance L0, it determines whether Er is less than the preset minimum sound energy E0. If Er is less than or equal to the preset minimum sound energy E0, it means that the user can hardly perceive the sound energy generated in the air duct, and the control module does not adjust the speed of motor 2. If Er is greater than the preset minimum sound energy E0, the sound energy of the air duct system is relatively large, which affects the user's cooking experience. The control module reduces the speed of motor 2 and re-detects. If L is greater than the preset distance L0, the sound energy impact is weak, and the control module does not adjust the speed of motor 2.

[0100] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A duct system, installed in an integrated stove, the duct system comprising a duct structure (4) and a fan system installed within the duct structure (4), the fan system comprising a motor (2). Its features are, The air duct system also includes: A vibration detection module is installed in the fan system to detect the vibration signal of the motor (2); A noise detection module is provided in the duct structure (4) and the fan system for detecting noise signals in the duct structure (4) and the fan system; A distance measuring module is installed at the head of the integrated stove where the air duct system is located, and is used to detect the distance between the user and the integrated stove; The control module is communicatively connected to the vibration detection module, the noise detection module, the ranging module, and the motor (2). The control module obtains the detection results of the vibration detection module, the noise detection module, and the ranging module, and controls the rotational speed of the motor (2). When the vibration frequency of the motor (2) is equal to the excitation frequency of the motor (2), and when the vibration frequency of the motor (2) is not equal to the peak noise frequency, it is determined that the structure of the fan system is abnormal. The control module issues an alarm prompt and suggests that the user clean or replace the motor. When the vibration frequency of the motor (2) is not equal to the excitation frequency of the motor (2), it is determined that the excitation of the motor (2) is abnormal. The control module issues an alarm prompt and reminds the user to repair the motor.

2. The air duct system according to claim 1, characterized in that: The fan system also includes a volute (1), an impeller, and a motor bracket (3). The volute (1) is located inside the air duct structure (4). The impeller is rotatably located in the volute (1). The motor (2) is mounted on the volute (1) and its power output end is connected to the impeller drive. The motor (2) is used to drive the impeller to rotate. The motor bracket (3) is used to connect the motor (2) and the air duct structure (4). The vibration detection module is located on the motor bracket (3).

3. The air duct system according to claim 2, characterized in that: The volute (1) includes a front cover (11), a rear cover (12), an upper ring wall (13), and a lower ring wall (14). The noise detection module is respectively provided at the positions of the front cover (11) near the outlet of the volute (1), the rear cover (12) near the outlet of the volute (1), the upper ring wall (13) near the outlet of the volute (1), and the lower ring wall (14) near the outlet of the volute (1). The positions of the upper ring wall (13) near the outlet of the volute (1) and the lower ring wall (14) near the outlet of the volute (1) correspond to each other.

4. The air duct system according to claim 3, characterized in that: The air duct structure (4) includes a front plate (41), a rear plate (42), a left side plate, a right side plate, a bottom plate (43), and a cover plate. The front plate (41), the rear plate (42), and the bottom plate (43) are respectively provided with the noise detection module. The position of the noise detection module on the front plate (41) corresponds to the position of the noise detection module on the front cover (11). The position of the noise detection module on the rear plate (42) corresponds to the position of the noise detection module on the rear cover (12). The position of the noise detection module on the bottom plate (43) corresponds to the position of the noise detection module on the lower ring wall (14).

5. A method for controlling a duct system, applied to a duct system according to any one of claims 1-4, characterized in that, The method includes: Obtain the excitation frequency of the motor (2) in the air duct system; Obtain the vibration signal and noise signal of the motor (2), and extract the vibration parameters and noise parameters of the motor (2); Obtain the noise signal of the duct structure (4) in the duct system and extract the duct noise parameters; Based on the vibration parameters of the motor (2), the noise parameters of the motor (2), and the noise parameters of the air duct, the system noise energy of the air duct system is determined; The user distance is obtained, wherein the user distance indicates the length of the user's distance from the center of the integrated stove; The rotational speed of the motor (2) is determined based on the system noise energy and the user distance; When the vibration frequency of the motor (2) is equal to the excitation frequency of the motor (2), and when the vibration frequency of the motor (2) is not equal to the noise peak frequency, it is determined that the structure of the fan system is abnormal, and the control module issues an alarm prompt, suggesting that the user clean or replace it. When the vibration frequency of the motor (2) is not equal to the excitation frequency of the motor (2), it is determined that the excitation of the motor (2) is abnormal, and the control module issues an alarm prompt, reminding the user to repair it.

6. The method according to claim 5, characterized in that, The step of determining the system noise energy of the duct system based on the vibration parameters of the motor (2), the noise parameters of the motor (2), and the noise parameters of the duct includes: The air duct system is divided into at least two sound propagation zones; Based on the vibration parameters of the motor (2), the noise parameters of the motor (2), and the noise parameters of the air duct, determine the total regional noise of each sound propagation area; The total system noise of the duct system is determined based on the total noise of the area in each of the sound propagation regions; The total noise of the system is converted into an energy representation to obtain the system noise energy.

7. The method according to claim 6, characterized in that, The front plate (41), rear plate (42) and bottom plate (43) of the air duct structure (4) in the air duct system are respectively equipped with noise detection modules, and the front cover (11), rear cover (12), upper ring wall (13) and lower ring wall (14) of the volute (1) in the air duct system are respectively equipped with noise detection modules; The division of the air duct system into at least two sound propagation zones includes: The sound propagation area between the rear cover (12) and the rear plate (42) is divided into the first propagation area; The sound propagation area between the front cover (11) and the front panel (41) is divided into a second propagation area; The acoustic propagation area corresponding to the outlet of the volute (1) is divided into the third propagation area; The acoustic propagation area between the lower ring wall (14) and the base plate (43) is divided into the fourth propagation area.

8. The method according to claim 7, characterized in that: The determination of the total regional noise of each sound propagation area based on the vibration parameters of the motor (2), the noise parameters of the motor (2), and the noise parameters of the air duct includes: For any of the sound propagation regions, obtain the plate noise peak detected at the location of the air duct structure (4) corresponding to the sound propagation region, and obtain the volute (1) noise peak detected at the location of the volute (1) corresponding to the sound propagation region. Based on the noise peak of the plate and the noise peak of the volute (1), sound superposition processing is performed to obtain the total noise of the sound propagation area.

9. The method according to claim 5, characterized in that, The method further includes: Obtain the plate parameters of the air duct system; The sound energy loss is determined based on the plate parameters and the excitation frequency. The system noise energy is corrected based on the loss of acoustic energy.

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