Method for turning off a range hood, range hood and processor

Abstract

The embodiment of the present application provides an oil fume extractor shutdown method, an oil fume extractor and a processor, the method comprises the following steps: in response to a shutdown instruction of the oil fume extractor, after cutting off the working power supply of a motor of the oil fume extractor, the real-time rotating speed of the motor is monitored; the motor is used for supplying power for an air wheel of the oil fume extractor, and the air wheel is used for generating airflow blowing to a check valve of the oil fume extractor; in the case that the real-time rotating speed of the motor is less than or equal to a preset rotating speed threshold, a gradually reduced auxiliary power supply current is provided for the motor, so as to reduce the airflow deceleration of the airflow generated by the air wheel, and slow down the reset process of the check valve. The embodiment of the present application can reduce the noise generated when the oil fume extractor is shut down, especially the noise generated by the reset of the check valve, and improve the user experience.

Description

Technical Field

[0001] This invention relates to the field of kitchen appliances, and in particular to a method for turning off a range hood, a range hood, and a processor. Background Technology

[0002] The check valve is a crucial component of a range hood, responsible for expelling fumes into a shared duct or to the outside environment. Its function is to effectively isolate the range hood from the external duct when not in use, preventing objects from entering the hood. When the motor is turned on, the check valve opens under the static pressure generated by the motor-driven impeller, allowing fumes to pass smoothly through the duct and escape. The main component responsible for the check valve's opening and closing is its valve plate. During the opening, closing, and retraction process, the valve plate contacts the check valve seat (e.g., the limiting point on the check valve seat), producing an impact sound that degrades the user experience.

[0003] The check valves of range hoods on the market are mainly made of aluminum and plastic. However, the difference in materials cannot eliminate or improve the noise problem caused by the impact sound of the check valve. In addition to air volume and static pressure, the main inspection indicators of range hoods are also the overall noise and user experience. Summary of the Invention

[0004] In view of the above problems, embodiments of the present invention are proposed to provide a method for turning off a range hood that overcomes or at least partially solves the above problems, which can reduce the noise generated when the range hood is turned off, especially the noise generated by the check valve resetting, and improve the user experience.

[0005] Accordingly, embodiments of the present invention also provide a range hood, a readable storage medium, and a computer program product to ensure the implementation and application of the above methods.

[0006] In a first aspect, embodiments of the present invention disclose a method for turning off a range hood, the method comprising: In response to a shutdown command for the range hood, after the power supply to the motor of the range hood is cut off, the real-time speed of the motor is monitored; the motor is used to power the impeller of the range hood, and the impeller is used to generate airflow towards the check valve of the range hood; When the real-time speed of the motor is less than or equal to a preset speed threshold, a gradually decreasing auxiliary power supply current is provided to the motor to reduce the airflow deceleration of the wind turbine and slow down the reset process of the check valve.

[0007] Optionally, providing the motor with a gradually decreasing auxiliary power supply current includes: acquiring the real-time speed deceleration of the motor, and providing the motor with a gradually decreasing auxiliary power supply current so that the motor runs at a preset speed deceleration until it stops; wherein the preset speed deceleration is less than the natural speed deceleration of the motor.

[0008] Optionally, obtaining the real-time speed deceleration of the motor and providing a gradually decreasing auxiliary power supply current to the motor so that the motor runs at a preset speed deceleration until it stops includes: Monitor the real-time speed of the motor operating based on the auxiliary power supply current, and calculate the real-time speed deceleration of the motor; If the real-time speed deceleration is greater than the preset speed deceleration, the auxiliary power supply current is increased; if the real-time speed deceleration is less than the preset speed deceleration, the auxiliary power supply current is decreased; so that the motor runs at the preset speed deceleration until it stops.

[0009] Optionally, the preset speed threshold is greater than or equal to the first speed threshold and less than or equal to the second speed threshold; the first speed threshold is less than the second speed threshold; the first speed threshold is the speed of the motor when the check valve starts to reset in a clean state; the second speed threshold is the speed of the motor when the motor is stopped from working and powered.

[0010] Optionally, the method further includes: determining a preset speed threshold within the range selected by the first speed threshold and the second speed threshold based on the cumulative usage time of the range hood; the magnitude of the preset speed threshold is proportional to the cumulative usage time.

[0011] Optionally, the method further includes: determining a preset speed threshold within the range selected by the first speed threshold and the second speed threshold based on the weight difference between the monitored weight and the initial weight of the valve plate of the check valve; the magnitude of the preset speed threshold is proportional to the weight difference; The monitored weight of the valve plate is obtained by a weight sensor during the previous shutdown of the range hood.

[0012] Optionally, the preset speed deceleration is greater than 0 and less than or equal to the maximum speed deceleration corresponding to the minimum value of the preset speed threshold; The maximum speed deceleration is calculated using the minimum value and the allowable reset time.

[0013] Optionally, the auxiliary power supply current is less than the current value of the working power supply.

[0014] Secondly, embodiments of the present invention disclose a range hood, the range hood comprising: a motor, a fan connected to the motor, a check valve located in the same exhaust duct as the fan, and a processor communicatively connected to the motor; The processor is used to execute: In response to a shutdown command for the range hood, after the power supply to the motor of the range hood is cut off, the real-time speed of the motor is monitored; the motor is used to power the impeller of the range hood, and the impeller is used to generate airflow towards the check valve of the range hood; When the real-time speed of the motor is less than or equal to a preset speed threshold, a gradually decreasing auxiliary power supply current is provided to the motor to reduce the airflow deceleration of the wind turbine and slow down the reset process of the check valve.

[0015] Thirdly, embodiments of the present invention disclose a processor, comprising: The shutdown monitoring module is used to monitor the real-time speed of the motor after the power supply to the motor of the range hood is cut off in response to the shutdown command of the range hood. The motor is used to power the impeller of the range hood, and the impeller is used to generate airflow towards the check valve of the range hood. The auxiliary power supply module is used to provide a gradually decreasing auxiliary power supply current to the motor when the real-time speed of the motor is less than or equal to a preset speed threshold, so as to reduce the airflow deceleration of the wind turbine and slow down the reset process of the check valve.

[0016] Fourthly, embodiments of the present invention disclose a readable storage medium storing a program or instructions, which, when executed by a processor, can implement the range hood shutdown method as described above.

[0017] Fifthly, embodiments of the present invention disclose a computer program product, including a computer program, wherein when the computer program is executed by a processor, the steps of the range hood shutdown method described in any of the foregoing are as follows.

[0018] The embodiments of the present invention have the following advantages: In this embodiment, upon detecting a shutdown command for the range hood, the power supply to the motor is stopped. While the motor will continue to rotate due to inertia, its speed will decrease. The motor powers the impeller, which rotates at the same speed as the motor. As the motor speed decreases, the impeller speed also decreases synchronously, thus reducing the airflow generated by the impeller. This airflow then blows towards the check valve. The check valve is opened by the airflow and returns to its reset state after the airflow decreases to a certain level. In this application, when the motor's real-time speed decreases to a preset speed threshold, the processor provides auxiliary power to the motor to slow down the decrease in motor speed, extending the time it takes for the motor to reach a stop state (i.e., speed dropping to 0). This also extends the check valve's reset time, reducing its reset speed while maintaining the same reset path. Because the check valve's reset speed is reduced, the impact speed at the limit point during reset is smaller, reducing or eliminating the impact sound during reset, thus reducing or eliminating noise and improving the user experience. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the check valve in the open state of this application; Figure 2 This is a schematic diagram of the check valve reset state in this application; Figure 3 This is a flowchart of the steps of a method for turning off a range hood according to the present invention; Figure 4 This is a structural block diagram of a processor embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the electronic device provided in an embodiment of the present invention. Detailed Implementation

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] The terms "first," "second," etc., used in the specification and claims of this invention are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, the first object can be one or more. Furthermore, the term "and / or" in the specification and claims is used to describe the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. In embodiments of this invention, the term "multiple" refers to two or more, and other quantifiers are similar.

[0022] The check valve of a range hood is usually installed at the connection between the range hood's exhaust vent and the common flue. Its core function is to prevent the backflow of cooking fumes and odors from the common flue when the range hood is turned off. Its working principle is as follows: when the range hood is turned on, the exhaust airflow generated by the impeller opens the valve plate of the check valve, putting the check valve in the open exhaust state. Figure 1 As shown; after the range hood is turned off, the exhaust airflow disappears, and the valve plate resets under its own weight, maintaining a normally closed anti-backflow state, as... Figure 2 As shown.

[0023] In related technologies, during the reset of the check valve, the valve plate 2 of the check valve will collide with the limiting point 1 on the check valve base, producing a clicking noise, which will cause noise and affect the user experience.

[0024] Reference Figure 3 The diagram illustrates a step flowchart of an embodiment of a method for turning off a range hood according to the present invention. The method is applied to a processor and may include the following steps: Step 101: In response to the shutdown command of the range hood, after cutting off the power supply to the motor of the range hood, monitor the real-time speed of the motor; the motor is used to power the impeller of the range hood, and the impeller is used to generate airflow towards the check valve of the range hood. Step 102: When the real-time speed of the motor is less than or equal to a preset speed threshold, provide the motor with a gradually decreasing auxiliary power supply current to reduce the airflow deceleration of the wind turbine and slow down the reset process of the check valve.

[0025] The method for shutting down the range hood provided in this embodiment of the invention can be applied to the processor, i.e. the main controller of the range hood, to reduce the noise generated during the shutdown process, especially the noise generated during the reset of the check valve.

[0026] In this embodiment of the invention, when the user needs the range hood to be turned off, they send a shutdown command, for example, through the communication link of the smart home system, or by pressing the power button on the range hood. At this time, the processor, acting as the main controller of the range hood, receives the shutdown command and promptly cuts off the power supply to the motor. In this example, the motor powers the impeller in the range hood. In typical usage, the motor's rotation drives the impeller, generating airflow that expels cooking fumes. This airflow also blows onto the range hood's check valve, causing it to open and allowing airflow to escape.

[0027] It's understandable that there could be two pathways between the motor and the processor, such as a power supply pathway and a control pathway. The power supply pathway is used by the processor to supply power to the motor, while the control pathway is used by the processor to issue control commands to the motor or receive feedback from the motor. When the processor detects a shutdown command, it cuts off the power supply to the motor in the power supply pathway and monitors the motor's real-time speed through the control pathway. At this time, the control pathway still has a weak power supply, used only to send and receive relevant commands. Alternatively, the motor can actively feed back its real-time speed to the processor through the control pathway.

[0028] The processor can monitor the motor's real-time speed continuously without intervals. Within the limited time from the motor being powered off to completely stopping (i.e., the speed is 0), it can promptly execute relevant processing steps based on the motor's real-time speed.

[0029] Furthermore, if the real-time motor speed is detected to be less than or equal to a preset speed threshold, the range hood's processor will re-power the motor to slow down the rate at which the motor speed decreases. For example, it can provide auxiliary power current to the motor, causing the motor speed to recover to some extent.

[0030] Understandably, after the power supply to the motor is cut off based on the shutdown command, the motor will not stop instantly. Due to inertia, the motor will continue to rotate. However, since there is no continuous positive energy supply (such as the working current that makes the motor rotate in the forward direction), the motor's shutdown speed will gradually decrease until it stops completely due to air resistance. As a result, the impeller will continue to generate a gradually decreasing shutdown airflow, and the check valve will remain open under the action of the shutdown airflow. When the shutdown speed drops to a certain level, causing the shutdown airflow to be unable to counteract the gravitational acceleration corresponding to the check valve's own weight, the check valve will reset and collide with the limit point 1 on the check valve base, producing an impact sound.

[0031] In this example, when the real-time rotational speed is less than or equal to a preset speed threshold, power will be supplied to the motor again to partially restore its speed, thus slowing down the rate of decrease in motor speed and reducing the motor's deceleration. Furthermore, the airflow deceleration generated by the impeller rotating at the same speed as the motor will also decrease, slowing down the rate at which the airflow disappears. Therefore, the duration of airflow generated by the impeller is extended, significantly extending the lifespan of the airflow. By continuously providing the check valve with airflow that counteracts gravity, the net force during the check valve's reset process is reduced, decreasing its acceleration during reset. This reduces the impact velocity at the moment of reset, thereby reducing the resulting impact sound (i.e., noise) and improving the user experience.

[0032] In other words, by reducing the slope of the motor speed change, the duration of airflow can be extended, thus providing a buffer for the descent and reset of the check valve, reducing the speed and noise of the check valve reset impact.

[0033] Understandably, the auxiliary power supply current needs to be a gradually decreasing parameter; otherwise, the motor cannot stop completely (speed to 0).

[0034] In this embodiment, when the processor of the range hood detects a shutdown command, it stops supplying power to the motor. Due to inertia, the motor will continue to rotate, but its speed will decrease. The motor powers the impeller, and the impeller's speed is the same as the motor's. As the motor speed decreases, the impeller's speed also decreases synchronously, thus reducing the airflow generated by the impeller. This airflow then blows towards the check valve. The check valve is opened by the airflow, and after the airflow decreases to a certain level, the check valve returns to its reset state. In this application, when the motor's real-time speed decreases to a preset speed threshold, the processor provides auxiliary power to the motor to slow down the decrease in motor speed, extending the time it takes for the motor to reach a stop state (i.e., the speed drops to 0), which in turn extends the check valve's reset time. Under the premise that the check valve's reset path remains unchanged, the check valve's reset speed can be reduced. Because the check valve's reset speed is reduced, the speed at which the check valve hits the limit point during reset is smaller, which can reduce or eliminate the impact sound emitted during check valve reset, i.e., reduce or eliminate noise and improve the user experience.

[0035] In one embodiment of this application, providing the motor with a gradually decreasing auxiliary power supply current includes: acquiring the real-time speed deceleration of the motor, and providing the motor with a gradually decreasing auxiliary power supply current to make the motor run at a preset speed deceleration until it stops; wherein the preset speed deceleration is less than the natural speed deceleration of the motor.

[0036] That is, in this embodiment, the motor is kept running in the desired state until it stops by monitoring the real-time speed deceleration of the motor.

[0037] Among them, the natural speed deceleration is the speed deceleration of the motor during the process of running due to inertia after the power supply is stopped, under the influence of natural external resistance such as air until it completely stops.

[0038] For example, in actual use, there may be unpredictable external conditions such as increased friction due to bearing aging and changes in air resistance due to temperature variations in air density. A fixed auxiliary power supply current scheme is sensitive to these environmental changes, and executing the scheme according to a uniform preset auxiliary power supply current can easily reduce its effectiveness. In this example, the auxiliary power supply current is adjusted based on the real-time speed deceleration value to influence the motor shutdown process. This closed-loop feedback control strategy allows for accurate adjustment of the auxiliary power supply current, ensuring the shutdown scheme's noise reduction effect.

[0039] Specifically, compared to providing arbitrary auxiliary power supply current to slow down the slope of motor speed change, this embodiment uses the real-time speed deceleration of the motor as a reference standard. By standardizing the auxiliary power supply current through the collected real-time speed deceleration, the motor shutdown process is indirectly affected, which can improve the effect of slowing down the reset process of the check valve.

[0040] In one specific implementation, obtaining the real-time speed deceleration of the motor and providing a gradually decreasing auxiliary power supply current to the motor so that the motor runs at a preset speed deceleration until it stops includes: S11, monitor the real-time speed of the motor operating based on the auxiliary power supply current, and calculate the real-time speed deceleration of the motor; S12, if the real-time speed deceleration is greater than the preset speed deceleration, increase the auxiliary power supply current; if the real-time speed deceleration is less than the preset speed deceleration, decrease the auxiliary power supply current; so that the motor runs at the preset speed deceleration until it stops.

[0041] Specifically, the real-time speed reduction in this example is calculated based on the real-time speed that the processor can monitor, and the rate of decrease of the real-time speed can be quantified through the real-time speed reduction.

[0042] For example, if the real-time rotational speed at time Ts is Ar / s and the real-time rotational speed at time T+1s is Br / s, then the real-time rotational speed deceleration is (AB) r / s. 2 .

[0043] In this example, the auxiliary power supply current is linearly related to the motor speed. Therefore, the auxiliary power supply current can be adjusted in real time by the relationship between the real-time speed deceleration and the preset speed deceleration, so that the real-time speed deceleration is consistent with the preset speed deceleration.

[0044] For example, if the real-time speed deceleration is greater than the preset speed deceleration, it indicates that the motor speed is decreasing too rapidly. Greater power supply is needed to slow the rate of speed decrease, extend the time to reach the stop state, and ensure a buffering effect for the pressure relief valve reset. In this example, this is achieved by increasing the auxiliary power supply current.

[0045] If the real-time speed deceleration is less than the preset speed deceleration, it indicates that the motor speed decreases too slowly, the applied auxiliary power supply current is too large, and there is unnecessary waste of resources. The auxiliary power supply current needs to be reduced to improve resource utilization.

[0046] In this embodiment, based on the linear relationship between the auxiliary power supply current and the motor speed, the auxiliary power supply current can be adjusted by monitoring the real-time speed deceleration of the motor to achieve closed-loop control of the motor speed. When the auxiliary power supply current is too low, timely adjustment can ensure a buffering effect for the pressure relief valve reset; when the auxiliary power supply current is too high, timely adjustment can avoid resource waste.

[0047] In some embodiments of this application, the preset speed threshold is greater than or equal to a first speed threshold and less than or equal to a second speed threshold; the first speed threshold is less than the second speed threshold. The first speed threshold is the motor speed when the check valve starts to reset in a clean state; the second speed threshold is the motor speed when the motor is shut down and the power supply is stopped.

[0048] Specifically, the preset speed threshold in this application is selected within a speed range, where the maximum value of the speed range is the second speed threshold and the minimum value is the first speed threshold.

[0049] For example, a parameter within the aforementioned speed range can be selected as a fixed preset speed threshold and written into the processor after the range hood leaves the factory (or during production). During user operation, when the processor executes the shutdown method provided in this application, it determines whether to provide a gradually decreasing auxiliary power supply current to the motor according to the fixed preset speed threshold.

[0050] The first speed threshold can be the motor speed corresponding to the check valve starting to reset in a clean state. That is, when the range hood is newly manufactured or newly put into use, the check valve is clean and lightweight, free of grease buildup from use. Even a small airflow can keep it open, meaning the check valve can remain open even when the motor is running at a low speed. The check valve will only begin to descend and reset when the motor speed is reduced to a very low value.

[0051] Therefore, the motor speed at which the check valve begins to reset under these conditions is taken as the first speed threshold. If the motor speed is less than the first speed threshold, the check valve will definitely descend and reset; if the motor speed is greater than or equal to the first speed threshold, the check valve may begin to descend and reset, at which point monitoring is required.

[0052] The second speed threshold can be the motor speed when the power supply to the motor is stopped. Specifically, for some range hoods, the power supply to the motor stops not only after receiving a shutdown command but also while the range hood is running at a low speed. In this case, the motor has already started rotating due to inertia, which could cause the check valve to drop and reset. Therefore, the motor speed corresponding to the range hood being switched to a low speed can be used as the second speed threshold to be monitored. At this time, the check valve may have already started to drop and reset, requiring intervention. That is, the upper limit of the motor speed (second speed threshold) to be monitored in this application can be set according to the operating state of the range hood when it is at a low speed and / or after receiving a shutdown command.

[0053] Furthermore, based on the setting of the first speed threshold, during the use of the range hood, the weight of the check valve plate may increase due to the accumulation of grease and smoke during exhaust. This could cause the check valve to begin descending and resetting before the motor speed drops to the first speed threshold. However, in this case, the corresponding motor speed is still lower than the motor speed corresponding to the lower setting (the second speed threshold). In other words, the motor speed that needs to be monitored in this special case is also included in the selected speed range between the first and second speed thresholds.

[0054] For example, the first speed threshold is 200 r / min, and the second speed threshold is 700 r / min. Then the range of the preset speed threshold S1 is: 200 r / min ≤ S1 ≤ 700 r / min.

[0055] Here, 200 r / min represents the motor speed at which the check valve begins to descend and reset when the range hood is first manufactured. At this time, the valve plate of the check valve is in a clean state, so the airflow generated by the low speed can prevent it from resetting. Only when the motor is at an extremely low speed like 200 r / min will the airflow be insufficient to keep the check valve open, and the check valve may begin to reset, requiring intervention in this embodiment. 700 r / min represents the motor speed corresponding to the range hood being in a low-speed setting. At this time, the power supply may have already been cut off, and the range hood is operating based on inertia. The check valve is at risk of descending and resetting, therefore, attention or further intervention is required.

[0056] Furthermore, when the check valve is covered with oil, it may begin to descend and reset within the range of [200 r / min, 700 r / min] when the motor speed is within this range.

[0057] In this example, when the check valve is in its optimal operating state (i.e., immediately after leaving the factory), the motor speed corresponding to the start of its descent and reset is set to a first speed threshold, which is the minimum value of the preset speed threshold. This ensures that the preset speed threshold requiring intervention is never lower than the first speed threshold. This extreme value minimizes the motor speed that triggers the auxiliary power supply current, reducing resource waste. The motor speed corresponding to the range hood operating at a low speed is used as the second speed threshold, which is the maximum value of the preset speed threshold. This ensures that monitoring or intervention begins when the motor speed drops to the second speed threshold. This extreme value allows for rapid monitoring or intervention of the motor speed within the possible range of the check valve's descent and reset, avoiding missing the check valve's rapid reset process.

[0058] Therefore, by confirming the preset speed threshold within the range of the first speed threshold to the second speed threshold, it is possible to ensure that the reset process of the check valve is not missed while meeting the user's personalized needs.

[0059] In one example, the method further includes: determining a preset speed threshold within the range selected by the first speed threshold and the second speed threshold based on the cumulative usage time of the range hood; the magnitude of the preset speed threshold is proportional to the cumulative usage time.

[0060] As mentioned above, the check valve may become contaminated with grease during the use of the range hood, causing the valve plate to gradually increase in weight. This results in a continuous increase in the motor speed corresponding to the check valve's descent and reset. Therefore, the processor can select a preset speed threshold for triggering the auxiliary power supply current within the speed range formed by the first and second speed thresholds, based on the cumulative usage time of the range hood.

[0061] Specifically, the longer the cumulative usage time of the range hood, the larger the preset speed threshold should be. For example, if the cumulative usage time is close to 0, the first speed threshold is used as the preset speed threshold in step S12; if the cumulative usage time is five or even ten years, the parameter value is gradually adjusted to be close to the second speed threshold, or the second speed threshold is used as the preset speed threshold in step S12.

[0062] In this example, instead of writing a fixed preset speed threshold to the processor, the processor dynamically determines the preset speed threshold based on the cumulative usage time of the range hood. This allows the processor to adaptively select the preset speed threshold during the user's use of the range hood, providing auxiliary power supply current reasonably while reducing noise generated during the range hood's shutdown process, thereby improving energy efficiency.

[0063] In one example, the method further includes: determining a preset speed threshold within a range selected by the first speed threshold and the second speed threshold based on the weight difference between the monitored weight and the initial weight of the valve plate of the check valve; the magnitude of the preset speed threshold is proportional to the weight difference; The monitored weight of the valve plate is obtained by a weight sensor during the previous shutdown of the range hood.

[0064] In this example, the range hood is also equipped with a weight sensor to obtain the weight of the valve plate on the check valve, which is used as a condition for determining the preset speed threshold.

[0065] Specifically, a weight sensor can be installed below the valve plate of the check valve. Each time the range hood is completely turned off and the check valve fully resets under its own weight, the weight of the valve plate is collected as the monitored weight of the check valve plate.

[0066] The initial weight refers to the weight of the valve plate of the check valve when the range hood is brand new and completely clean.

[0067] The heavier the monitoring weight of the valve plate, the more oil contamination it contains. The heavier the monitoring weight m of the valve plate, the greater the gravitational force G it experiences (G=mg, g represents gravitational acceleration). A larger airflow is required to counteract its own weight and keep it in the open state.

[0068] By analyzing the weight difference between the monitored weight and the initial weight, the changes in the check valve plate can be more accurately identified, and a corresponding preset speed threshold can be determined within the range of [first speed threshold, second speed threshold]. For example, when the weight difference is 0, the first speed threshold is set as the preset speed threshold; the larger the weight difference, the closer the preset speed threshold is to the second speed threshold.

[0069] In this example, determining the preset speed threshold based on the check valve's disc weight is more accurate than dynamically determining it solely based on the range hood's cumulative usage time. For instance, even with prolonged use of the range hood for cooking processes like steaming and boiling, the check valve accumulates minimal grease. By selecting the preset speed threshold based on the valve disc's weight, the required threshold can be determined more accurately. A smaller preset speed threshold means that, while achieving noise reduction, the auxiliary power supply current will be triggered later, reducing resource consumption.

[0070] In one embodiment, the preset speed deceleration is greater than 0 and less than or equal to the maximum speed deceleration corresponding to the minimum value of the preset speed threshold; wherein, the maximum speed deceleration is calculated by the minimum value and the allowable reset time.

[0071] In this embodiment, a parameter range is also set for the selection of the preset speed deceleration, so that the fixed preset speed deceleration is written into the processor during the manufacturing process before the range hood leaves the factory, so as to control the auxiliary power supply current in a closed loop and ensure the noise reduction effect of the shutdown method of this application.

[0072] Specifically, the preset speed deceleration must be greater than zero. That is, during the shutdown process, the motor speed needs to decrease until it stops completely, and it cannot maintain a certain speed continuously.

[0073] At the same time, for the minimum value of the preset speed threshold, i.e. the first preset speed, a corresponding maximum speed deceleration needs to be set to ensure that even if the motor speed is the first preset speed, it will stop after the allowed reset time under the intervention of the implementation method of this application.

[0074] The allowable reset time is the time during which the impact sound (noise) emitted during the reset process of the recirculation valve is less than the range that the human ear can perceive (about 25dB), for example, 15s.

[0075] The maximum speed deceleration indicates the fastest allowable reduction in motor speed. The first preset speed is the minimum speed at which auxiliary power supply current begins to be provided, i.e., the minimum speed at which intervention is required. If the minimum speed at which intervention is required can guarantee that the motor will not stop until after the allowable reset time (i.e., even at the current maximum speed reduction rate, the minimum speed will only reach 0 after a certain time threshold), then other speed values ​​will also be able to stop after the allowable reset time at the maximum speed deceleration, and will also be able to stop after the reset time at other speed decelerations not exceeding the maximum speed deceleration. This ensures that the noise generated during reset is less than the range perceptible to the human ear, guaranteeing noise reduction.

[0076] Therefore, the preset speed deceleration should be less than or equal to the maximum speed deceleration, and greater than zero.

[0077] For example, the range of the preset speed deceleration S2 is, for example, 0 r / min. 2 ≤S2≤800r / min 2 That is, the maximum speed deceleration can be 800 r / min 2 .

[0078] That is, corresponding to the first preset speed of 200 r / min, the maximum speed deceleration is 800 r / min. 2 In this case, the motor will stop (stop rotating) after 15 seconds. At this time, the noise generated by the check valve resetting can be less than 25dB, which is less than the range that the human ear can hear, thus achieving the purpose of noise reduction.

[0079] Furthermore, for motor speeds within the range of [200 r / min, 700 r / min], as long as the speed deceleration does not exceed 800 r / min... 2 The time to reach the shutdown state is greater than 15 seconds, which can achieve the purpose of noise reduction.

[0080] Optionally, during actual execution, it can be done at [300r / min] 2 800r / min 2 Determine the preset rotational speed and deceleration within the specified range.

[0081] In some specific implementations, multiple range hood prototypes with different airflow rates were tested to identify motor speeds, the motor speed corresponding to the start of check valve reset, etc., as shown in Table 1. Table 1:

[0082] As shown in Table 1, the motor speed of each range hood prototype is in the first column of parameters when running at low speed. In some prototypes, the range hood is powered off during low-speed operation; therefore, in some embodiments of this application, the second speed threshold is set to 700 r / min. The motor speed when the check valve plate begins to descend and reset is the second column of parameters; in some embodiments of this application, the first speed threshold is set to 200 r / min. Furthermore, based on the condition that the check valve plate completes reset after the allowed reset time, the measured motor speed deceleration in each prototype is the third column of parameters, and a preset speed deceleration range of [300 r / min] can be selected accordingly. 2 800r / min 2 ].

[0083] In this example, a range of values ​​is set for the preset speed deceleration, ensuring that the preset speed deceleration is less than the speed deceleration corresponding to the first speed threshold. This guarantees that the check valves reset after the allowed reset time, and the noise generated during reset is generally less than that perceptible to the human ear, thus achieving noise reduction. Simultaneously, each speed deceleration needs to be greater than zero, ensuring that the motor eventually stops, rather than running continuously.

[0084] In some examples, the auxiliary power supply current is less than the current value of the operating power supply.

[0085] Specifically, the auxiliary power supply current provided in this application serves to slow down the rate of decrease in motor speed, and therefore a smaller current value can be used to achieve this purpose.

[0086] When the auxiliary power supply current is greater than or equal to the working power supply current, the motor speed will increase rapidly, even exceeding the motor speed during normal operation of the range hood. On the one hand, if the instantaneous power supply current exceeds the working power supply current, it may damage the components in the range hood. On the other hand, even if the auxiliary power supply current is equal to the working power supply current and does not affect the components, the motor speed should only decrease during the shutdown process. Providing the working power supply current would far exceed the current required to control the motor speed, easily leading to resource waste.

[0087] In this example, considering the operational safety of the components in the range hood and the need to make full use of resources, the auxiliary power supply current is set to be less than the working power supply current. This will not pose a safety threat to the components in the range hood and will also avoid wasting resources.

[0088] It should be noted that, for the sake of simplicity, the method embodiments are all described as a series of actions. However, those skilled in the art should understand that the embodiments of the present invention are not limited to the described order of actions, because according to the embodiments of the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions involved are not necessarily essential to the embodiments of the present invention.

[0089] In another embodiment provided in this application, a range hood is also provided, the range hood comprising: a motor, a fan connected to the motor, a check valve located in the same exhaust duct as the fan, and a processor communicatively connected to the motor; The processor is used to execute: In response to a shutdown command for the range hood, after the power supply to the motor of the range hood is cut off, the real-time speed of the motor is monitored; the motor is used to power the impeller of the range hood, and the impeller is used to generate airflow towards the check valve of the range hood; When the real-time speed of the motor is less than or equal to a preset speed threshold, a gradually decreasing auxiliary power supply current is provided to the motor to reduce the airflow deceleration of the wind turbine and slow down the reset process of the check valve.

[0090] The current range hood can perform the shutdown method of the range hood provided in the above embodiments to reduce the noise generated during shutdown and improve the user experience.

[0091] Reference Figure 4 The diagram shows a structural block diagram of a processor according to the present invention, the processor comprising: The shutdown monitoring module 201 is used to monitor the real-time speed of the motor after the power supply to the motor of the range hood is cut off in response to the shutdown command of the range hood; the motor is used to power the impeller of the range hood, and the impeller is used to generate airflow towards the check valve of the range hood. The auxiliary power supply module 202 is used to provide a gradually decreasing auxiliary power supply current to the motor when the real-time speed of the motor is less than or equal to a preset speed threshold, so as to reduce the airflow deceleration of the wind turbine and slow down the reset process of the check valve.

[0092] Optionally, the auxiliary power supply module 202 includes: The monitoring and adjustment module is used to acquire the real-time speed deceleration of the motor and provide the motor with a gradually decreasing auxiliary power supply current so that the motor runs at a preset speed deceleration until it stops; wherein the preset speed deceleration is less than the natural speed deceleration of the motor.

[0093] Optionally, the monitoring and adjustment module specifically includes: The speed deceleration monitoring module is used to monitor the real-time speed of the motor operating based on the auxiliary power supply current and to calculate the real-time speed deceleration of the motor. The speed deceleration adjustment module is used to increase the auxiliary power supply current when the real-time speed deceleration is greater than the preset speed deceleration, and to decrease the auxiliary power supply current when the real-time speed deceleration is less than the preset speed deceleration, so that the motor runs at the preset speed deceleration until it stops.

[0094] Optionally, the preset speed threshold is greater than or equal to the first speed threshold and less than or equal to the second speed threshold; the first speed threshold is less than the second speed threshold; the first speed threshold is the speed of the motor when the check valve starts to reset in a clean state; the second speed threshold is the speed of the motor when the motor is stopped from working and powered.

[0095] Optionally, the processor further includes: The first speed threshold determination module is used to determine the preset speed threshold within the range selected by the first speed threshold and the second speed threshold based on the cumulative usage time of the range hood; the magnitude of the preset speed threshold is proportional to the cumulative usage time.

[0096] Optionally, the processor further includes: The second speed threshold determination module is used to determine the preset speed threshold within the range selected by the first speed threshold and the second speed threshold based on the weight difference between the monitored weight and the initial weight of the valve plate of the check valve; the magnitude of the preset speed threshold is proportional to the weight difference; wherein, the monitored weight of the valve plate is obtained by a weight sensor in the previous off state of the range hood.

[0097] Optionally, the preset speed deceleration is greater than 0 and less than or equal to the maximum speed deceleration corresponding to the minimum value of the preset speed threshold; wherein, the maximum speed deceleration is calculated by the minimum value and the allowable reset time.

[0098] Optionally, the auxiliary power supply current is less than the current value of the working power supply.

[0099] This invention provides a processor as the main controller in a range hood. When the processor detects a shutdown command for the range hood, it stops supplying power to the motor. Due to inertia, the motor will continue to rotate, but its speed will decrease. The motor powers the impeller, and the impeller's speed is the same as the motor's. As the motor speed decreases, the impeller's speed also decreases synchronously, thus reducing the airflow generated by the impeller. This airflow is directed towards the check valve. The check valve is opened by the airflow and returns to its reset state after the airflow decreases to a certain level. In this application, when the motor's real-time speed decreases to a preset speed threshold, the processor provides auxiliary power to the motor to slow down the decrease in motor speed, extending the time before the motor stops (i.e., the speed drops to 0), which in turn extends the reset time of the check valve. Under the premise that the check valve's reset path remains unchanged, the reset speed of the check valve can be reduced. Because the reset speed of the check valve is reduced, the speed at which the check valve hits the limit point during reset is smaller, which can reduce or eliminate the impact sound emitted during check valve reset, that is, reduce or eliminate noise and improve user experience.

[0100] As the device embodiment is basically similar to the method embodiment, the description is relatively simple, and relevant parts can be found in the description of the method embodiment.

[0101] Reference Figure 5 This is a schematic diagram of the structure of the electronic device provided in an embodiment of the present invention. Figure 5 As shown, the electronic device is, for example, the physical structure of the aforementioned processor. The electronic device includes: a subprocessor, a memory, a communication interface, and a communication bus. The subprocessor, the memory, and the communication interface communicate with each other via the communication bus. The memory stores at least one executable instruction, which causes the subprocessor to perform the steps of the range hood shutdown method described in the aforementioned embodiment.

[0102] This invention provides a non-transitory computer-readable storage medium that, when the instructions in the storage medium are executed by a terminal's program or processor, enables the terminal to perform the steps of the aforementioned method for turning off the range hood.

[0103] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0104] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, processors, or computer program products. Therefore, embodiments of the present invention can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Furthermore, embodiments of the present invention can take the form of computer program products implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0105] Embodiments of the present invention are described with reference to flowchart illustrations and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0106] These computer program instructions may also be stored in a computer-readable storage medium capable of directing a computer or other programmable data processing terminal device to operate in a predictive manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0107] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal equipment, causing a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0108] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0109] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for turning off a range hood, characterized in that, The method includes: In response to a shutdown command for the range hood, after the power supply to the motor of the range hood is cut off, the real-time speed of the motor is monitored; the motor is used to power the impeller of the range hood, and the impeller is used to generate airflow towards the check valve of the range hood; When the real-time speed of the motor is less than or equal to a preset speed threshold, a gradually decreasing auxiliary power supply current is provided to the motor to reduce the airflow deceleration of the wind turbine and slow down the reset process of the check valve.

2. The method for turning off the range hood according to claim 1, characterized in that, Providing the motor with a gradually decreasing auxiliary power supply current includes: The real-time speed deceleration of the motor is obtained, and an auxiliary power supply current is provided to the motor in a gradually decreasing manner so that the motor runs at a preset speed deceleration until it stops; wherein, the preset speed deceleration is less than the natural speed deceleration of the motor.

3. The method for shutting off the range hood according to claim 2, characterized in that, The step of obtaining the real-time speed deceleration of the motor and providing a gradually decreasing auxiliary power supply current to the motor so that the motor runs at a preset speed deceleration until it stops includes: Monitor the real-time speed of the motor operating based on the auxiliary power supply current, and calculate the real-time speed deceleration of the motor; If the real-time speed deceleration is greater than the preset speed deceleration, the auxiliary power supply current is increased; if the real-time speed deceleration is less than the preset speed deceleration, the auxiliary power supply current is decreased; so that the motor runs at the preset speed deceleration until it stops.

4. The method for turning off the range hood according to claim 1, characterized in that, The preset speed threshold is greater than or equal to the first speed threshold and less than or equal to the second speed threshold; the first speed threshold is less than the second speed threshold. The first speed threshold is the motor speed corresponding to the start of the reset of the check valve in the clean state; The second speed threshold is the speed of the motor when the power supply to the motor is stopped.

5. The method for shutting off the range hood according to claim 4, characterized in that, The method further includes: Based on the cumulative usage time of the range hood, a preset speed threshold is determined within the range selected by the first speed threshold and the second speed threshold; the magnitude of the preset speed threshold is proportional to the cumulative usage time.

6. The method for shutting off the range hood according to claim 4, characterized in that, The method further includes: Based on the weight difference between the monitored weight and the initial weight of the check valve disc, a preset speed threshold is determined within the range selected by the first speed threshold and the second speed threshold; the magnitude of the preset speed threshold is proportional to the weight difference. The monitored weight of the valve plate is obtained by a weight sensor during the previous shutdown of the range hood.

7. The method for shutting off the range hood according to claim 2, characterized in that, The maximum speed deceleration corresponding to the minimum value of the preset speed deceleration being greater than 0 and less than or equal to the preset speed threshold. The maximum speed deceleration is calculated using the minimum value and the allowable reset time.

8. The method for shutting off the range hood according to claim 1, characterized in that, The auxiliary power supply current is less than the working power supply current.

9. A range hood, characterized in that, The range hood includes: a motor, a fan connected to the motor, a check valve located in the same exhaust duct as the fan, and a processor communicatively connected to the motor; The processor is used to execute: In response to a shutdown command for the range hood, after the power supply to the motor of the range hood is cut off, the real-time speed of the motor is monitored; the motor is used to power the impeller of the range hood, and the impeller is used to generate airflow towards the check valve of the range hood; When the real-time speed of the motor is less than or equal to a preset speed threshold, a gradually decreasing auxiliary power supply current is provided to the motor to reduce the airflow deceleration of the wind turbine and slow down the reset process of the check valve.

10. A processor, characterized in that, include: The shutdown monitoring module is used to monitor the real-time speed of the motor after the power supply to the motor of the range hood is cut off in response to the shutdown command of the range hood. The motor is used to power the impeller of the range hood, and the impeller is used to generate airflow that blows toward the check valve of the range hood; The auxiliary power supply module is used to provide a gradually decreasing auxiliary power supply current to the motor when the real-time speed of the motor is less than or equal to a preset speed threshold, so as to reduce the airflow deceleration of the wind turbine and slow down the reset process of the check valve.

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