Range hood and control method and device thereof

Abstract

The application relates to an extractor hood and a control method and device thereof. The extractor hood comprises a flue fan and a fan module. The flue fan is arranged in a flue of the extractor hood and is used to operate under the action of flowing gas in the flue to reflect the blockage degree of the flue. The control method comprises the following steps: acquiring the rotating speed of the flue fan; selecting the working gear of the fan module according to the rotating speed of the flue fan to match the rotating speed of the flue fan with a preset rotating speed; and the preset rotating speed is the rotating speed of the flue fan when the blockage degree meets the normal working requirement of the extractor hood. By arranging the flue fan in the flue of the extractor hood, the rotating speed of the flue fan is used to reflect the blockage degree of the flue. The method is applicable to different types and categories of fan modules. After the fan module is changed, the parameters in the controller do not need to be adjusted repeatedly through experiments, and the maintenance efficiency of the extractor hood in the later period is greatly improved.

Description

Technical Field

[0001] This application relates to the field of range hood technology, and in particular to a range hood and its control method and device. Background Technology

[0002] With the improvement of people's living standards and the demand for quality life, range hoods are not only used in large places such as restaurants and hotels, but have also entered thousands of households. More and more families are using range hoods to purify kitchen gases and solve the problem of oil fumes generated during cooking.

[0003] Traditional range hood blockage detection functions suffer from low maintenance efficiency and poor versatility. Summary of the Invention

[0004] The first technical problem solved by this invention is to provide a control method for a range hood that is applicable to various fan modules, can accurately determine the blockage of the flue, and adaptively adjust the working level of the fan module.

[0005] The second technical problem solved by the present invention is to provide a range hood that is applicable to various fan modules, can accurately determine the duct blockage, and adaptively adjust the working level of the fan module.

[0006] The third technical problem solved by the present invention is to provide a control device for a range hood that is applicable to various fan modules, can accurately determine the duct blockage, and adaptively adjust the working speed of the fan module.

[0007] The fourth technical problem solved by this invention is to provide a computer-readable storage medium for range hoods that is applicable to various fan modules, can accurately determine the blockage of the flue, and adaptively adjust the working speed of the fan module.

[0008] The first technical problem mentioned above is solved by the following technical solution:

[0009] A control method for a range hood, the range hood including a flue fan and a fan module, the flue fan being installed inside the flue of the range hood, the flue fan operating under the action of flowing gas in the flue to reflect the degree of blockage in the flue, the control method including: acquiring the rotational speed of the flue fan; selecting the operating level of the fan module according to the rotational speed of the flue fan to match the rotational speed of the flue fan with a preset speed; the preset speed is the rotational speed of the flue fan when the degree of blockage meets the normal operating requirements of the range hood.

[0010] Based on the control method of the range hood in this embodiment, a flue fan is installed in the flue of the range hood, and the speed of the flue fan is used to reflect the degree of blockage in the flue. It is applicable to different models and types of fan modules. After the fan module is changed, there is no need to repeat the experiment to adjust the parameters in the controller, which greatly improves the efficiency of later maintenance of the range hood.

[0011] In one embodiment, the step of selecting the operating level of the fan module according to the speed of the flue fan includes: keeping the operating level unchanged when the speed of the flue fan matches the preset speed; and increasing or decreasing the operating level when the speed of the flue fan does not match the preset speed.

[0012] In one embodiment, there are multiple working positions, for working position M i Corresponding to a set of speed ranges Any two speed ranges in and Yes: If The upper limit is less than The lower limit value, then The corresponding target work level is higher than The corresponding target operating speed; when the speed of the flue fan does not match the preset speed, the steps to increase or decrease the operating speed include: when the speed of the flue fan does not match the preset speed, repeatedly determine the target speed range from a set of speed ranges corresponding to the operating speed of the fan module, switch the operating speed to the target operating speed range, until the speed of the flue fan matches the preset speed; the target speed range is the speed range to which the speed of the flue fan belongs.

[0013] This embodiment helps save time switching the operating speed of the fan module. By selecting an appropriate target operating speed based on the target speed range, the fan module can quickly switch to the currently required operating speed. Compared with the method of switching only to adjacent speeds at a time, this avoids frequent speed switching and saves time. This also allows the range hood to more quickly extract and expel cooking fumes when the flue is blocked.

[0014] In one embodiment, the control method further includes:

[0015] If the speed of the flue fan is within [n0-Δn, n0+Δn], it is determined that the speed of the flue fan matches the preset speed; where n0 is the preset speed and Δn is the allowable speed deviation.

[0016] In one embodiment, the working positions include M1, M2 and M3, wherein M3 is higher than M2 and M2 is higher than M1;

[0017] The set of speed ranges corresponding to M1 are as follows: The corresponding target work level is M3. The corresponding target work level is M2;

[0018] The set of speed ranges corresponding to M2 are as follows: The corresponding target work level is M3. The corresponding target work level is M1;

[0019] The corresponding speed range for M3 is as follows: The corresponding target work level is M2. The corresponding target work level is M1.

[0020] In one embodiment, after the step of selecting the operating speed of the fan module according to the speed of the flue fan so that the speed of the flue fan matches the preset speed, the method further includes: if the speed of the flue fan is (0, n0-Δn) after the duration of the operating speed being at the highest operating speed is greater than a preset time, a prompt signal is issued.

[0021] After receiving the alert signal, users can seek assistance from maintenance personnel. Maintenance personnel can adjust or replace the fan module, and for users on different floors sharing a main flue, they can also inspect the main flue to eliminate any blockages. The alert signal can also be remotely sent to maintenance personnel via wireless network, facilitating on-site inspection and repair.

[0022] The second technical problem mentioned above is solved by the following technical solution:

[0023] A range hood includes: a fan module for extracting cooking fumes; a flue fan disposed within the flue of the range hood, used to operate under the influence of flowing gas in the flue to reflect the degree of blockage in the flue; a speed measuring module for detecting the rotational speed of the flue fan; and a controller connected to the speed measuring module and the fan module, including a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, it implements the steps of the range hood control method as described in any of the above embodiments.

[0024] Based on the range hood in this embodiment, a flue fan is installed in the flue of the range hood, and the speed of the flue fan is used to reflect the degree of blockage in the flue. It is applicable to different models and types of fan modules. After the fan module is changed, there is no need to repeat the experiment to adjust the parameters in the controller, which greatly improves the efficiency of later maintenance of the range hood.

[0025] In one embodiment, the flue fan is located at the check valve port of the flue.

[0026] The gas flow rate at the check valve port is the best indicator of the degree of blockage in the flue. Placing the flue fan at the check valve port can improve the accuracy of judging the degree of blockage.

[0027] The third technical problem mentioned above is solved by the following technical solution:

[0028] A control device for a range hood includes a duct fan and a fan module. The duct fan is installed inside the duct of the range hood and operates under the action of the flowing gas in the duct to reflect the degree of blockage in the duct. The control device includes: a speed acquisition module for acquiring the speed of the duct fan; and a speed selection module for selecting the operating speed of the fan module according to the speed of the duct fan, so that the speed of the duct fan matches a preset speed. The preset speed is the speed of the duct fan when the degree of blockage meets the normal operating requirements of the range hood.

[0029] Based on the control device of the range hood in this embodiment, a flue fan is installed in the flue of the range hood, and the speed of the flue fan is used to reflect the degree of blockage in the flue. It is applicable to different models and types of fan modules. After the fan module is changed, there is no need to repeat the experiment to adjust the parameters in the controller, which greatly improves the efficiency of later maintenance of the range hood.

[0030] The fourth technical problem mentioned above is solved by the following technical solution:

[0031] A computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the control method for a range hood in any of the above embodiments.

[0032] Based on the computer-readable storage medium in this embodiment, by installing a flue fan in the flue of the range hood, the rotation speed of the flue fan can reflect the degree of blockage in the flue. This method is applicable to different models and types of fan modules. After the fan module is changed, there is no need to repeat the experiment to adjust the parameters in the controller, which greatly improves the efficiency of later maintenance of the range hood. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology 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.

[0034] Figure 1 This is a flowchart illustrating the control method for a range hood in one embodiment;

[0035] Figure 2This is a flowchart illustrating the control method for a range hood in another embodiment;

[0036] Figure 3 This is a flowchart illustrating the control method for a range hood in yet another embodiment;

[0037] Figure 4 This is a structural block diagram of a range hood in one embodiment;

[0038] Figure 5 This is a structural block diagram of the control device for a range hood in one embodiment;

[0039] Explanation of reference numerals in the attached diagram: 10-fan module, 30-flue fan, 50-speed measurement module, 70-controller, 110-speed acquisition module, 130-gear selection module. Detailed Implementation

[0040] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0042] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

[0043] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “under,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0044] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. Furthermore, in the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if there is transmission of electrical signals or data between the connected objects.

[0045] When used herein, the singular forms of “a,” “an,” and “ / the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0046] Most range hoods on the market lack automatic variable frequency speed control. If the duct becomes clogged or internal resistance increases, the actual airflow produced by the range hood is often lower than expected, resulting in poor smoke extraction and a negative user experience. For existing range hoods that can address duct blockage through variable frequency speed control, the current and speed of the fan module are typically collected to determine the blockage level and implement appropriate control strategies. However, if the motor or turbine changes, the previously established relationship between motor current / speed and duct blockage becomes inapplicable, leading to inaccurate judgments. Adjusting these parameters requires significant time for re-experimentation, resulting in inefficiency.

[0047] Based on the above reasons, this invention provides a control method for a range hood, wherein the range hood includes a duct fan and a fan module. When the user turns on the range hood while cooking, the fan module operates to draw cooking fumes into the range hood and discharge them through the duct. The duct fan is installed inside the duct of the range hood and operates under the influence of the flowing gas in the duct to reflect the degree of blockage in the duct. It can be understood that the flow velocity in the duct is related to the degree of blockage. Under the same operating setting of the fan module, the greater the blockage in the duct, the slower the gas flow velocity in the duct. The rotation speed of the duct fan installed inside the duct reflects the magnitude of the gas flow velocity in the duct, thereby reflecting the degree of blockage. The following description uses the application of this range hood control method in a range hood controller as an example.

[0048] like Figure 1 As shown, the control method for the range hood includes steps S102 and S104.

[0049] S102, obtain the rotational speed of the flue fan.

[0050] Specifically, the rotational speed of the flue fan can be detected by setting up a speed measurement module. This module can include a reflector and a photoelectric speed measurement unit. A reflector is attached to the fan blades, and the photoelectric speed measurement unit emits a light signal towards the fan. The frequency of the reflected light signal is related to the fan's rotational speed. The photoelectric speed measurement unit converts the reflected light signal into a corresponding electrical signal, and the range hood controller can calculate the fan's rotational speed based on this signal frequency. Alternatively, the speed measurement module can include a light source and a photoelectric conversion unit. The light source sends a light signal towards the fan, which passes through the gaps between the fan blades and is received by the photoelectric conversion unit. Therefore, different fan rotational speeds result in different frequencies of the electrical signal output by the photoelectric conversion unit, allowing the range hood controller to calculate the fan's rotational speed based on this frequency.

[0051] S104 selects the operating speed of the fan module according to the speed of the flue fan, so that the speed of the flue fan matches the preset speed.

[0052] The preset speed is the fan speed of the duct when the blockage level meets the normal operating requirements of the range hood. It can be understood that the variable frequency speed control of the fan module is achieved by switching between different operating levels. The higher the operating level of the fan module, the faster the motor speed in the fan module. Specifically, the fan module is driven by the variable frequency signal output from the drive module. When it is necessary to change the operating level, the controller sends an adjustment command to the variable frequency module, and the drive module outputs a variable frequency signal corresponding to the operating level. Each operating level corresponds to a different frequency of the variable frequency signal; the higher the operating level, the higher the frequency of the corresponding variable frequency signal. The preset speed can be obtained through experimental testing, simulating different levels of duct blockage and testing the range hood's smoke extraction capacity under different blockage levels. The fan speed at which the extraction capacity meets relevant standards or regulations is selected as the preset speed.

[0053] Based on the control method of the range hood in this embodiment, a flue fan is installed in the flue of the range hood, and the speed of the flue fan is used to reflect the degree of blockage in the flue. It is applicable to different models and types of fan modules. After the fan module is changed, there is no need to repeat the experiment to adjust the parameters in the controller, which greatly improves the efficiency of later maintenance of the range hood.

[0054] In one embodiment, such as Figure 2 As shown, the control method for the range hood includes steps S202 to S206.

[0055] S202, obtain the rotational speed of the flue fan.

[0056] Step S202 is the same as step S102, as can be found above.

[0057] S204 maintains the same operating speed when the speed of the flue fan matches the preset speed.

[0058] It's understandable that the range hood can work normally if the fan speed matches the preset speed, without needing to adjust the operating level.

[0059] S206 can increase or decrease the operating speed when the speed of the flue fan does not match the preset speed.

[0060] It's understandable that a mismatch between the exhaust fan's speed and the preset speed means the range hood cannot properly extract cooking fumes. Adjusting the operating speed is necessary to match the fan's speed to the preset speed. Specifically, if the exhaust fan speed is too high, it means the current operating speed's anti-clogging capability is higher than the degree of duct blockage; from an energy-saving perspective, the operating speed should be lowered. Conversely, if the exhaust fan speed is too low, it means the current operating speed's anti-clogging capability is lower than the degree of duct blockage; the operating speed should be increased to improve the range hood's anti-clogging capability.

[0061] In one embodiment, there are multiple working positions, for working position M... i Corresponding to a set of speed ranges Any two speed ranges in and Yes: If The upper limit is less than The lower limit value, then The corresponding target work level is higher than The corresponding target operating speed. Here, N is an integer greater than or equal to 2. To avoid difficulty in determining the speed range of the flue fan, the speed ranges within the same group should not overlap; that is, there should be no repeated endpoints among the speed ranges within the same group, ensuring that each flue fan's speed can find a unique corresponding speed range. In one embodiment, the speed ranges within the same group are continuous on the number axis, meaning a group of speed ranges can cover a segment or the entire number axis. In this embodiment, each operating speed of the fan module has a corresponding group of speed ranges, and each speed range corresponds to a target operating speed. Once it is determined that the flue fan's speed is within a certain speed range, the fan module's operating speed can be switched to the target operating speed corresponding to that speed range.

[0062] This embodiment helps save time switching the operating speed of the fan module. By selecting an appropriate target operating speed based on the target speed range, the fan module can quickly switch to the currently required operating speed. Compared with the method of switching only to adjacent speeds at a time, this avoids frequent speed switching and saves time. This also allows the range hood to more quickly extract and expel cooking fumes when the flue is blocked.

[0063] Specifically, please refer to Figure 3 The control method for the range hood includes steps S302 to S310.

[0064] S302, obtain the speed of the flue fan.

[0065] Step S302 is the same as step S102, as can be found above.

[0066] S304 determines whether the speed of the flue fan matches the preset speed.

[0067] If the speed of the flue fan matches the preset speed, proceed to step S306. If the speed of the flue fan does not match the preset speed, proceed to step S308. It is also worth noting that, considering that factors causing blockage may intensify or weaken over time, steps S302 and S304 can be performed after step S306 to maintain the flue fan speed matching the preset speed. The speed measurement module can be controlled to collect the flue fan speed at preset intervals, thus executing step S302 at preset intervals. Alternatively, the speed measurement module can remain on to continuously acquire the flue fan speed output by the speed measurement module. Step S304 can be executed by the range hood controller, or it can be executed by other computer devices, which then send the judgment result to the range hood controller so that the range hood controller can select to execute either step S306 or step S308.

[0068] S306, keep the working gear unchanged.

[0069] Step S302 is similar to step S204, and can be referred to above.

[0070] S308 determines the target speed range from a set of speed ranges corresponding to the operating position of the fan module.

[0071] The target speed range is the speed range to which the flue fan belongs. This can be understood as follows: after determining the speed range to which the flue fan belongs from the multiple speed ranges corresponding to the current operating position of the fan module, the speed range to which the flue fan belongs is taken as the target speed range.

[0072] S310 switches the working gear to the target working gear that corresponds to the target speed range.

[0073] It can be understood that the range hood controller generates a corresponding control signal based on the target operating level and inputs this control signal to the inverter module. The inverter module then drives the fan module with the corresponding inverter signal, switching the fan module's operating level to the target operating level. After the fan module's operating level is switched to the target operating level, the process returns to step S302. If the speed of the flue fan after the level switch matches the preset speed, the operating level remains unchanged. If the speed of the flue fan after the level switch does not match the preset speed, a new target speed range is determined based on the newly acquired flue fan speed and the new operating level, and the fan module's operating level is switched to the target operating level corresponding to the target speed range. This process is repeated until the flue fan speed matches the preset speed.

[0074] In one embodiment, the control method further includes:

[0075] When the speed of the flue fan falls within the range of [n0-Δn, n0+Δn], it is determined that the speed of the flue fan matches the preset speed. Here, n0 is the preset speed, and Δn is the allowable speed deviation. It can be understood that if the absolute value of the difference between the flue fan speed and the preset speed is within the allowable speed deviation, even if the flue fan speed is not exactly equal to the preset speed, the deviation has a small impact on the normal operation of the range hood and can be ignored. Therefore, when the speed of the flue fan falls within the range of [n0-Δn, n0+Δn], it is determined that the speed of the flue fan matches the preset speed.

[0076] In one embodiment, the operating speeds include M1, M2, and M3. M3 is higher than M2, and M2 is higher than M1. That is, the motor speed of the fan module in operating speed M3 is higher than the motor speed in operating speed M2, and the motor speed of the fan module in operating speed M2 is higher than the motor speed in operating speed M1. M1 corresponds to a set of speed ranges as follows: The corresponding target work level is M3. The corresponding target operating gear is M2. The set of speed ranges corresponding to M2 are as follows: The corresponding target work level is M3. The corresponding target operating gear is M1. The set of speed ranges corresponding to M3 are as follows: The corresponding target work level is M2. The corresponding target work level is M1.

[0077] In one specific embodiment, the operating levels are described as consisting of M1, M2, and M3. In response to the automatic frequency conversion command, the range hood controller controls the fan module to start operating from operating level M1 and stores the current operating level information, i=1. The range hood controller receives the rotational speed of the flue fan from the speed measurement module in real time. If the detected rotational speed of the flue fan is within the range... This means the blockage is slightly affecting the range hood's operation. A higher operating speed should be tested to see if it's sufficient to combat the blockage. In this case, the fan module's operating speed should be increased to M2, and i should be reassigned to 2. If the detected fan speed is within [a certain range], [further action will be taken]. This means the blockage is severely affecting the range hood's operation. The highest operating setting should be tested to see if it's sufficient to combat the blockage. Therefore, the fan module's operating setting should be increased to M3, and i should be reassigned to 3. If the detected fan speed falls within [n0-Δn, n0+Δn], it means the fan module's operating setting is appropriate; the fan module's operating setting should remain unchanged.

[0078] When the status flag i=2, meaning the fan module is in operating mode M2, if the detected speed of the flue fan is within the range... This means the blockage is still affecting the range hood's operation. You should try the highest operating setting to see if it's sufficient to combat the blockage. In this case, increase the fan module's operating setting to M3 and reassign the value of i to 3. If the detected fan speed is within... If the fan module's operating speed is too high, the operating speed will be reduced to M1, and i will be reassigned to 1. If the detected speed of the flue fan is within [n0-Δn, n0+Δn], it means the fan module's operating speed is appropriate, and the operating speed of the fan module will remain unchanged.

[0079] When the range hood status flag i = 3, meaning the fan module is in operating mode M3, if the detected fan speed value meets the following conditions... This means the fan module's operating speed is too high, so the operating speed of the fan module is reduced to M2, and i is reassigned to 2. If the detected fan speed value meets the requirements... If the fan module's operating speed is too high, the operating speed should be reduced to M1, and i should be reset to 1. If the detected fan speed is within [n0-Δn, n0+Δn], the fan module's operating speed is appropriate, and the operating speed should be maintained. If the detected fan speed is within (0, n0-Δn), it means that even at its highest operating speed, the fan module cannot prevent blockage, and a warning signal should be issued to the user.

[0080] In one embodiment, after selecting the operating speed of the fan module based on the speed of the flue fan to match the preset speed, the method further includes: if the flue fan speed falls within (0, n0-Δn) after the operating speed has been at the highest setting for a period exceeding a preset time, a warning signal is issued. This indicates that even at its highest setting, the fan module cannot prevent blockage, hence the warning signal. Upon receiving the warning signal, the user can seek assistance from maintenance personnel. Maintenance personnel can adjust or replace the fan module, and for cases where users on different floors share a main flue, they can also inspect the main flue to eliminate factors causing blockage. The warning signal can also be remotely sent to maintenance personnel via wireless network, facilitating on-site inspection and repair.

[0081] It should be understood that, although Figure 1 or Figure 2 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figure 1 or Figure 2 At least some of the steps in the process may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but may be executed at different times. The execution order of these steps or stages is not necessarily sequential, but may be executed in turn or alternately with other steps or at least some of the steps or stages in other steps.

[0082] Please see Figure 4This invention also provides a range hood, which includes a fan module 10, a flue fan 30, a speed measuring module 50, and a controller 70. The fan module 10 is used to extract cooking fumes. After the fan module 10 operates, it draws the cooking fumes into the range hood and discharges them through the flue. The flue fan 30 is installed inside the flue of the range hood and operates under the influence of the flowing gas in the flue to reflect the degree of blockage in the flue. It can be understood that the gas flow rate inside the flue is related to the degree of blockage. With the fan module 10 operating at the same speed setting, the greater the blockage in the flue, the slower the gas flow rate. The rotational speed of the flue fan 30, installed inside the flue, reflects the magnitude of the gas flow rate, thereby reflecting the degree of blockage. The speed measuring module 50 is used to detect the rotational speed of the flue fan 30. The controller 70 is connected to the speed measurement module 50 and the fan module 10, and includes a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, it achieves the following: obtaining the rotation speed of the flue fan 30; selecting the working level of the fan module 10 according to the rotation speed of the flue fan 30 so that the rotation speed of the flue fan 30 matches the preset rotation speed; the preset rotation speed is the rotation speed of the flue fan 30 when the degree of blockage meets the normal working needs of the range hood.

[0083] Based on the range hood in this embodiment, by installing a flue fan 30 in the flue of the range hood, the rotation speed of the flue fan 30 is used to reflect the degree of blockage in the flue. It can be applied to different models and types of fan modules 10. After the fan module 10 is changed, there is no need to repeat the experiment to adjust the parameters in the controller 70, which greatly improves the efficiency of later maintenance of the range hood.

[0084] In some embodiments, the speed measuring module 50 may include a reflector and a photoelectric speed measuring unit. A reflector is attached to the blades of the flue fan 30, and the photoelectric speed measuring unit emits a light signal towards the flue fan 30. The frequency of the reflected light signal is related to the rotational speed of the flue fan 30. The photoelectric speed measuring unit converts the reflected light signal into a corresponding electrical signal, and the range hood controller 70 can calculate the rotational speed of the flue fan 30 based on the frequency of this electrical signal. The speed measuring module 50 may also include a light source and a photoelectric conversion unit. The light source sends a light signal towards the flue fan 30, which passes through the gaps between the blades of the flue fan 30 and is received by the photoelectric conversion unit. Therefore, different rotational speeds of the flue fan 30 result in different frequencies of the electrical signal output by the photoelectric conversion unit, and the range hood controller 70 can calculate the rotational speed of the flue fan 30 based on the frequency of this electrical signal.

[0085] In some embodiments, when the computer program is executed by the processor, it implements the steps of the control method for the range hood in any of the above embodiments.

[0086] In one embodiment, the flue fan 30 is positioned at the backflow preventer in the flue. It is understood that for residential users, currently each household's flue discharges cooking fumes through a shared common flue. The backflow preventer effectively prevents toxic gases and cooking fumes from other households from flowing back into one's own home, and also prevents flying insects such as mosquitoes, moths, and flies, as well as crawling insects such as geckos, from entering the flue. The gas flow rate at the backflow preventer is the best indicator of the flue's blockage level; positioning the flue fan 30 at the backflow preventer improves the accuracy of the blockage assessment.

[0087] Please see Figure 5 This invention also provides a control device for a range hood. The range hood includes a flue fan and a fan module. The flue fan is installed inside the flue of the range hood and operates under the influence of the flowing gas in the flue to reflect the degree of blockage in the flue. The control device includes a speed acquisition module 110 and a speed selection module 130. The speed acquisition module 110 acquires the speed of the flue fan. The speed selection module 130 selects the operating speed of the fan module based on the speed of the flue fan, so that the speed of the flue fan matches a preset speed. The preset speed is the speed of the flue fan when the degree of blockage meets the normal operating requirements of the range hood.

[0088] Based on the control device of the range hood in this embodiment, a flue fan is installed in the flue of the range hood, and the speed of the flue fan is used to reflect the degree of blockage in the flue. It is applicable to different models and types of fan modules. After the fan module is changed, there is no need to repeat the experiment to adjust the parameters in the controller, which greatly improves the efficiency of later maintenance of the range hood.

[0089] In one embodiment, the gear selection module 130 is used to maintain the operating gear unchanged when the speed of the flue fan matches the preset speed. The gear selection module 130 is also used to increase or decrease the operating gear when the speed of the flue fan does not match the preset speed.

[0090] In one embodiment, there are multiple working positions, for working position M... i Corresponding to a set of speed ranges Any two speed ranges in and Yes: If The upper limit is less than The lower limit value, then The corresponding target work level is higher than The corresponding target operating speed. The speed selection module 130 is used to repeatedly determine the target speed range from a set of speed ranges corresponding to the operating speed of the fan module when the speed of the flue fan does not match the preset speed, and switch the operating speed to the target operating speed range until the speed of the flue fan matches the preset speed. The target speed range is the speed range to which the flue fan's speed belongs.

[0091] In one embodiment, the speed selection module 130 is used to determine whether the speed of the flue fan matches a preset speed when the speed of the flue fan is within the range of [n0-Δn, n0+Δn]. Here, n0 is the preset speed, and Δn is the allowable speed deviation.

[0092] In one embodiment, the operating speeds include M1, M2, and M3. M3 is higher than M2, and M2 is higher than M1. That is, the motor speed of the fan module in operating speed M3 is higher than the motor speed in operating speed M2, and the motor speed of the fan module in operating speed M2 is higher than the motor speed in operating speed M1. M1 corresponds to a set of speed ranges as follows: The corresponding target work level is M3. The corresponding target operating gear is M2. The set of speed ranges corresponding to M2 are as follows: The corresponding target work level is M3. The corresponding target operating gear is M1. The set of speed ranges corresponding to M3 are as follows: The corresponding target work level is M2. The corresponding target work level is M1.

[0093] In one embodiment, the control device of the range hood further includes a prompting module. The prompting module is used to issue a prompt signal when the speed of the flue fan is within (0, n0-Δn) after the duration of the highest working position is greater than a preset time.

[0094] Specific limitations regarding the control device of the range hood can be found in the limitations of the control method for the range hood described above, and will not be repeated here. Each module in the aforementioned control device of the range hood can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module. It should be noted that the module division in this embodiment is illustrative and only represents a logical functional division; other division methods may be used in actual implementation.

[0095] This invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the following: obtaining the rotational speed of the flue fan; selecting the operating speed of the fan module according to the rotational speed of the flue fan so that the rotational speed of the flue fan matches a preset speed; the preset speed is the rotational speed of the flue fan when the degree of blockage meets the normal working requirements of the range hood.

[0096] Based on the computer-readable storage medium in this embodiment, by installing a flue fan in the flue of the range hood, the rotation speed of the flue fan can reflect the degree of blockage in the flue. This method is applicable to different models and types of fan modules. After the fan module is changed, there is no need to repeat the experiment to adjust the parameters in the controller, which greatly improves the efficiency of later maintenance of the range hood.

[0097] In one embodiment, when a computer program in a computer-readable storage medium is executed by a processor, it implements the following: when the speed of the flue fan matches a preset speed, maintaining the operating level unchanged; when the speed of the flue fan does not match the preset speed, increasing or decreasing the operating level.

[0098] In one embodiment, the computer program in the computer-readable storage medium, when executed by a processor, implements the following: determining that the speed of the flue fan matches a preset speed when the speed of the flue fan is within the range of [n0-Δn, n0+Δn]. Here, n0 is the preset speed, and Δn is the allowable speed deviation.

[0099] In one embodiment, the operating speeds include M1, M2, and M3. M3 is higher than M2, and M2 is higher than M1. That is, the motor speed of the fan module in operating speed M3 is higher than the motor speed in operating speed M2, and the motor speed of the fan module in operating speed M2 is higher than the motor speed in operating speed M1. M1 corresponds to a set of speed ranges as follows: The corresponding target work level is M3. The corresponding target operating gear is M2. The set of speed ranges corresponding to M2 are as follows: The corresponding target work level is M3. The corresponding target operating gear is M1. The set of speed ranges corresponding to M3 are as follows: The corresponding target work level is M2. The corresponding target work level is M1.

[0100] In one embodiment, when a computer program in a computer-readable storage medium is executed by a processor, it implements the following: if the speed of the flue fan is within (0, n0-Δn) after the duration of the highest operating setting is greater than a preset time.

[0101] 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. The 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 methods described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0102] In the description of this specification, references to terms such as "some embodiments," "other embodiments," and "ideal embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0103] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0104] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A control method for a range hood, characterized in that, The range hood includes a flue fan and a blower module. The blower module is used to extract cooking fumes. After the blower module operates, it draws the cooking fumes into the range hood and discharges them through the flue. The flue fan is installed inside the flue of the range hood and operates under the influence of the flowing air in the flue to reflect the degree of blockage in the flue. The control method includes: Obtain the rotational speed of the flue fan; The operating speed of the fan module is selected according to the rotation speed of the flue fan so that the rotation speed of the flue fan matches the preset rotation speed; the preset rotation speed is the rotation speed of the flue fan when the degree of blockage meets the normal working requirements of the range hood; The step of selecting the operating speed of the fan module based on the rotation speed of the flue fan includes: When the speed of the flue fan matches the preset speed, the operating gear remains unchanged; If the speed of the flue fan does not match the preset speed, the operating level will be increased or decreased. There are multiple working speeds, for working speed M i Corresponding to a set of speed ranges , ... Any two of the aforementioned speed ranges and Yes: If The upper limit is less than The lower limit value, then The corresponding target work level is higher than The corresponding target working level; The step of increasing or decreasing the operating speed when the speed of the flue fan does not match the preset speed includes: If the speed of the flue fan does not match the preset speed, the target speed range is repeatedly determined from a set of speed ranges corresponding to the working position of the fan module, and the working position is switched to the target working position corresponding to the target speed range until the speed of the flue fan matches the preset speed; the target speed range is the speed range to which the speed of the flue fan belongs.

2. The control method for a range hood according to claim 1, characterized in that, The control method further includes: The rotational speed of the flue fan belongs to In the case where the speed of the flue fan matches the preset speed, the following conditions are met: The preset rotation speed, To allow for speed deviation.

3. The control method for a range hood according to claim 2, characterized in that, The working positions include M1, M2 and M3, wherein M3 is higher than M2, and M2 is higher than M1; The set of speed ranges corresponding to M1 are as follows: , , The corresponding target working level is M3. The corresponding target working level is M2; The set of speed ranges corresponding to M2 are as follows: , , The corresponding target working level is M3. The corresponding target working level is M1; The set of speed ranges corresponding to M3 are as follows: , , The corresponding target working level is M2. The corresponding target working level is M1.

4. The control method for a range hood according to claim 1, characterized in that, The step of selecting the operating speed of the fan module based on the rotation speed of the flue fan to match the rotation speed of the flue fan with the preset rotation speed further includes: After the duration of the highest operating setting exceeds a preset time, the rotational speed of the flue fan becomes... In such cases, a warning signal will be issued.

5. A range hood, characterized in that, include: A fan module is used to extract cooking fumes; after the fan module is turned on, it draws the cooking fumes into the range hood and discharges them through the range hood's flue. A flue fan is installed inside the flue of the range hood and operates under the action of the flowing gas in the flue to reflect the degree of blockage in the flue. A speed measuring module is used to detect the rotational speed of the flue fan; A controller, connected to the speed measuring module and the fan module, includes a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, it implements the steps of the control method for the range hood as described in any one of claims 1 to 4.

6. The range hood according to claim 5, characterized in that, The flue fan is located at the check valve port of the flue.

7. A control device for a range hood, characterized in that, The range hood includes a flue fan and a fan module. The fan module is used to extract cooking fumes. After the fan module operates, it draws the cooking fumes into the range hood and discharges them through the flue. The flue fan is installed inside the flue of the range hood and operates under the influence of the flowing air in the flue to reflect the degree of blockage in the flue. The control device includes: A speed acquisition module is used to acquire the speed of the flue fan; The speed selection module is used to select the working speed of the fan module according to the speed of the flue fan, so that the speed of the flue fan matches the preset speed; the preset speed is the speed of the flue fan when the degree of blockage meets the normal working requirements of the range hood; The gear selection module is used to keep the working gear unchanged when the speed of the flue fan matches the preset speed, and to increase or decrease the working gear when the speed of the flue fan does not match the preset speed. There are multiple working speeds, for working speed M i Corresponding to a set of speed ranges , ... Any two of the aforementioned speed ranges and Yes: If The upper limit is less than The lower limit value, then The corresponding target work level is higher than The corresponding target working level; The gear selection module is used to repeatedly determine a target speed range from a set of speed ranges corresponding to the working gear of the fan module when the speed of the flue fan does not match the preset speed, and switch the working gear to the target working gear corresponding to the target speed range until the speed of the flue fan matches the preset speed; the target speed range is the speed range to which the speed of the flue fan belongs.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the control method for the range hood according to any one of claims 1 to 4.

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