Range hood and control method of range hood

Abstract

The application relates to an extractor hood and a control method of the extractor hood. The extractor hood comprises an air suction port, an air duct and an exhaust fan. The working process of the exhaust fan at least comprises a fast start running section. The running time length of the fast start running section is a preset time length. In the fast start running section, the back pressure value of the extractor hood is configured as a target back pressure value which is much larger than the actual back pressure value of the extractor hood, and the exhaust fan runs at a target rotating speed corresponding to the target back pressure value. The application sets the fast start running section for the extractor hood, especially at the initial stage of the power-on start of the extractor hood, so as to quickly reduce the back pressure value of the extractor hood, form good air flow organization, prepare for the extractor hood to quickly form good oil fume suction effect, improve the response efficiency of the extractor hood, and prepare for the exhaust fan to run at low rotating speed or low power in the subsequent stage, thereby reducing energy consumption.

Description

Technical Field

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

[0002] With the development of range hood technology, most manufacturers have adopted the approach of increasing the exhaust volume to improve the fume extraction performance. Currently, the exhaust volume of range hoods has increased from 16 cubic meters per minute to 20, 24, or even 26 cubic meters per minute. However, increasing the exhaust volume only meets the space's ventilation requirements. Without proper airflow organization, simply increasing the exhaust volume cannot reduce fume pollution or control airflow direction. Continuously increasing the exhaust volume actually increases energy consumption and removes a large amount of clean air from the room, resulting in reduced social benefits. Even with continuously increasing exhaust volume, at the same speed setting, the exhaust fan still operates at a stable speed and cannot quickly reduce the back pressure to create good airflow organization, which is detrimental to improving fume extraction efficiency. Summary of the Invention

[0003] Therefore, it is necessary to provide a range hood and its control method that can improve the performance of fume extraction while reducing energy consumption, in order to address the above-mentioned technical problems.

[0004] A range hood includes an air intake, an air duct, and an exhaust fan; the air intake is connected to the air duct; the exhaust fan is installed inside the air duct, and during the operation of the range hood, the exhaust fan's operation process includes at least a rapid start-up operation phase; the duration of the rapid start-up operation phase is a preset duration; During the rapid start-up operation phase, the back pressure value of the range hood is configured as the target back pressure value; the target back pressure value is much larger than the actual back pressure value of the range hood. The exhaust fan operates at the target speed corresponding to the target back pressure value.

[0005] In one embodiment, the range hood detects the actual back pressure value; the range hood obtains the theoretical time it takes for the back pressure value of the range hood to drop from the actual back pressure value to the preset back pressure value when the exhaust fan is running at the target speed, and configures the theoretical time as the preset time.

[0006] In one embodiment, the target back pressure value is between 250 bar and 350 bar.

[0007] In one embodiment, if the preset back pressure value is within the first back pressure range, the working process of the exhaust fan during the operation of the range hood also includes a target power operation segment corresponding to the first back pressure range and a target air volume operation segment corresponding to the second back pressure range. If the preset value is within the second back pressure range, during the operation of the range hood, the working process of the exhaust fan also includes a target air volume operation segment corresponding to the second back pressure range; within the target power operation segment, the back pressure value detected by the range hood is within the first back pressure range, and the exhaust fan operates at the target power within the preset first error range; Within the target airflow operating range, the back pressure value detected by the range hood is within the second back pressure range, and the exhaust fan operates within the preset second error range according to the target airflow; the target airflow is much smaller than the airflow corresponding to the target speed.

[0008] In one embodiment, the minimum value of the first back pressure range is greater than the maximum value of the second back pressure range; the minimum value of the first back pressure range is between 150 Pa and 450 Pa.

[0009] In one embodiment, the range hood includes two or more operating settings; Each operating setting corresponds to a different target power; and each operating setting corresponds to a different target airflow. Within the target power operating range, the range hood switches from the current operating level to the next operating level, and the exhaust fan switches from the target power corresponding to the current operating level to the target power corresponding to the next operating level. Within the target air volume operating range, the range hood switches from the current operating level to the next operating level, and the exhaust fan switches from the target air volume corresponding to the current operating level to the target air volume corresponding to the next operating level.

[0010] In one embodiment, the first error range is preset to be between ±8% of the target power; the operating mode corresponding to the target power operating segment is one or any combination of constant power mode, underpower mode and overpower mode; Among them, the constant power mode is that the exhaust fan operates at the target power within the preset third error range; the preset third error range is included in the preset first error range; The rate of change of the back pressure-air volume curve corresponding to the underpower mode is less than the rate of change of the back pressure-air volume curve corresponding to the constant power mode; in the underpower mode, the error of the actual operating power of the exhaust fan relative to the target power is the negative difference set between the preset first error range and the preset third error range; The rate of change of the back pressure-airflow curve corresponding to the overpower mode is greater than the rate of change of the back pressure-airflow curve corresponding to the constant power mode; in the overpower mode, the error of the actual operating power of the exhaust fan relative to the target power is the positive difference between the preset first error range and the preset third error range.

[0011] In one embodiment, the second back pressure range is between 1 Pa and 300 Pa; the preset second error range is between ±15% of the target air volume; the operating mode corresponding to the target air volume operating segment is one or any combination of constant air volume mode, intermediate extreme value mode and oscillation mode; Among them, the constant air volume mode is that the smoke exhaust fan operates according to the target air volume within the preset fourth error range; the preset fourth error range is included in the preset second error range; In the intermediate extreme mode, the actual output air volume of the smoke exhaust fan deviates in the direction of being greater than or less than the target air volume; in the intermediate extreme mode, the error of the actual output air volume of the smoke exhaust fan relative to the target air volume is the difference between the preset second error range and the preset fourth error range; In oscillation mode, the actual output air volume of the smoke exhaust fan oscillates between being less than the target air volume and being greater than the target air volume; in oscillation mode, the error of the actual output air volume of the smoke exhaust fan relative to the target air volume is the difference between the preset second error range and the preset fourth error range.

[0012] In one embodiment, the range hood further includes an air collection box; the air collection box has a through groove for accommodating the air intake; the air velocity at the air intake is between 11 cubic meters per minute and 18 cubic meters per minute.

[0013] A control method for a range hood, applied to a range hood including an air intake, an air duct, and an exhaust fan; the air intake is connected to the air duct; the exhaust fan is installed inside the air duct, and includes the following steps: Configure the back pressure value of the range hood as the target back pressure value; the target back pressure value is much larger than the actual back pressure value of the range hood. Control the exhaust fan to operate at the target speed corresponding to the target back pressure value.

[0014] One of the above technical solutions has the following advantages and beneficial effects: The range hoods provided in the embodiments of this application include an air intake, an air duct, and an exhaust fan. The air intake is connected to the air duct, and the exhaust fan is installed inside the air duct. During the operation of the range hood, the exhaust fan's operation includes at least a rapid start-up phase. The duration of the rapid start-up phase is a preset duration. During the rapid start-up phase, the back pressure value of the range hood is configured to a target back pressure value that is much greater than the actual back pressure value of the range hood, and the exhaust fan operates at a target speed corresponding to the target back pressure value. This application, by setting a rapid start-up phase for the range hood, especially in the initial stage when the range hood is first powered on, can quickly reduce the back pressure value of the range hood, forming a good airflow organization. This prepares the range hood for quickly achieving a good smoke extraction effect by reducing the back pressure value, improving the response efficiency of the range hood, and also prepares for the subsequent low-speed or low-power operation of the exhaust fan, reducing energy consumption. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the range hood in the embodiments of this application.

[0016] Figure 2 This is a schematic diagram illustrating the operation of a range hood in an embodiment of this application.

[0017] Figure 3 This is another schematic diagram of the operation process of the range hood in the embodiments of this application.

[0018] Figure 4 This is a schematic diagram of the operating mode of the range hood in the target power operating segment in the embodiments of this application.

[0019] Figure 5 This is a schematic diagram of the operating mode of the target air volume operating segment of the range hood in the embodiments of this application.

[0020] Figure 6 This is a schematic diagram of the operating mode of the target air volume operating segment of the range hood in the embodiments of this application.

[0021] Figure 7 This is a flowchart illustrating the control method of the range hood in an embodiment of this application. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0023] As a kitchen appliance, the range hood 100 is used to extract cooking fumes. To improve the fume extraction performance of the range hood 100, the common approach is to increase its exhaust volume. However, simply increasing the exhaust volume without proper airflow organization will not significantly improve the extraction performance and may even increase the energy consumption of the range hood 100.

[0024] To solve the above-mentioned technical problems, this application provides a range hood 100. For example... Figure 1 As shown, the range hood 100 includes an air intake 101, an air duct 103, and an exhaust fan (not shown in the figure). The air intake 101 connects to the air duct 103, and the range hood 100 draws in cooking fumes through the air intake 101 and exhausts the fumes into the air duct 103. The air duct 103 connects to the outside environment or the main air duct 103 of the building, thereby exhausting the cooking fumes from the building. It should be noted that the air intake 101 of the range hood 100 in this application is flat and elongated, with a small diameter. Under the same airflow speed provided by the exhaust fan, the negative pressure generated at the air intake 101 of the range hood 100 is greater than that generated at an air intake 101 with a larger diameter, thus facilitating the extraction of cooking fumes.

[0025] The exhaust fan is installed inside the duct 103. When the exhaust fan is working, it drives the air in the duct 103 to flow outward, thereby providing suction power for the range hood 100 to extract cooking fumes. When the back pressure of the range hood is high (for example, when the range hood is first powered on), the exhaust fan operates at a low speed and outputs a low air volume. It takes a long time to move the air in the duct, resulting in poor fume extraction during this period. It is even possible that the cooking is finished before the air in the duct has flowed well. If the fumes need to be exhausted, the range hood needs to continue running, resulting in wasted energy. However, if the range hood is turned off immediately after cooking, the fumes will accumulate in the duct, which can lead to blockage of the duct over time, and even backflow of fumes into the kitchen.

[0026] Therefore, in the process of operating the range hood, if... Figure 2As shown, the operation of the exhaust fan includes at least a rapid start-up phase. It should be noted that the rapid start-up phase is used to quickly reduce the back pressure of the range hood. In one example, the rapid start-up phase is activated when the actual back pressure detected by the range hood is greater than or equal to a preset back pressure value. The rapid start-up phase is not activated when the actual back pressure detected by the range hood is less than or equal to the preset back pressure value. It should be noted that the preset back pressure value can be set according to actual needs and serves as a threshold for the rapid start-up phase to be activated. For example, the preset back pressure value may be between 600 Pa and 1000 Pa. In one example, the rapid start-up phase is activated when the range hood's shutdown time is greater than or equal to a preset shutdown time; otherwise, it is not activated. It should be noted that the shutdown time is the time elapsed since the range hood was last turned on. The preset shutdown time is the time required for the actual back pressure value to rise to the preset back pressure value after the range hood is turned on and then turned off, or the time required for the airflow velocity in the duct to drop to the preset velocity after the range hood is turned on and then turned off (for example, the preset velocity can be zero).

[0027] Specifically, during the rapid start-up phase, the back pressure value of the range hood is configured as a target back pressure value. It's important to note that this target back pressure value is not the actual back pressure value detected by the range hood, but rather a pre-set back pressure value to ensure the range hood operates at this preset back pressure, increasing the exhaust fan speed to quickly reduce the range hood's back pressure. In one example, the target back pressure value is significantly higher than the actual back pressure value of the range hood. It should be noted that this actual back pressure value can be the back pressure value after a preset shutdown time since the range hood was last turned on, even when it is currently off. In one example, the target back pressure value is between 250 bar and 350 bar; for example, a target back pressure value of 300 bar.

[0028] During the rapid start-up phase, the exhaust fan operates at the target speed corresponding to the target back pressure value. To increase the rate of back pressure reduction, after setting a target back pressure value for the exhaust fan, the exhaust fan is controlled to operate at the target speed corresponding to that value. It should be noted that there is a one-to-one correspondence between the target speed and the target back pressure value; setting different target back pressure values ​​for the range hood will cause the exhaust fan to operate at the corresponding target speed.

[0029] The runtime of the quick-start operation segment is a preset duration. In one example, the range hood simulation calculates the theoretical time it takes for the back pressure value of the range hood to decrease from the actual back pressure value to the preset back pressure value when the exhaust fan is running at the target speed. Each time the range hood sets the target back pressure value, obtains the target speed, and simulates the theoretical time it takes for the actual back pressure value to decrease to the preset back pressure value when the exhaust fan is running at the target speed. It should be noted that the known parameters required for the simulation calculation have already been configured into the range hood, such as the duct size. After obtaining the theoretical duration, it is set as the preset duration.

[0030] Depending on the preset back pressure value setting, it can be divided into the following two cases: The first case, such as Figure 2 As shown, if the preset back pressure value is within the first back pressure range, during the operation of the range hood, the working process of the exhaust fan also includes a target power operation segment corresponding to the first back pressure range and a target air volume operation segment corresponding to the second back pressure range.

[0031] The second scenario, such as Figure 3 As shown, if the preset value is within the second back pressure range, during the operation of the range hood, the working process of the exhaust fan also includes a target air volume operation segment corresponding to the second back pressure range.

[0032] Taking the first scenario as an example, the target power operating segment and the target air volume operating segment will be explained. For example... Figure 2 As shown, during the operation of the range hood 100, the working process of the exhaust fan includes at least a target power operating segment corresponding to a first back pressure range and a target airflow operating segment corresponding to a second back pressure range. It should be noted that the operation of the range hood 100 extends from the start of its fume extraction function to stable operation. Stable operation, as referred to in this application, means that the exhaust fan operates at the target airflow within a preset second error range. In one example, the range hood 100 also includes an air collection box; the air collection box has a through slot for accommodating the air intake 101. The air collection box has left and right baffles and a guide air curtain. When the exhaust fan is operating stably, the air velocity at the air intake 101 is between 11 cubic meters per minute and 18 cubic meters per minute. For example, the air velocity at the air intake 101 is 12 cubic meters per minute, 13 cubic meters per minute, 14 cubic meters per minute, 15 cubic meters per minute, 16 cubic meters per minute, or 17 cubic meters per minute.

[0033] This application distinguishes between the target power operating segment and the target airflow operating segment based on back pressure value. Specifically, when the back pressure value of the range hood 100 is within a first back pressure range, the exhaust fan of the range hood 100 enters the target power operating segment; when the back pressure value of the range hood 100 is within a second back pressure range, the exhaust fan of the range hood 100 enters the target airflow operating segment. To implement this scheme, the range hood 100 includes a back pressure detection device and a control device. The back pressure detection device detects the back pressure value of the range hood 100 in real time or periodically and transmits the detected back pressure value to the control device. The control device controls whether the exhaust fan enters the target power operating segment or the target airflow operating segment based on the back pressure value. It should be noted that, in order to ensure that the airflow in the duct 103 is first driven by the target power operating segment to reduce the back pressure of the range hood 100, the back pressure value within the first back pressure range is greater than the back pressure value within the second back pressure range. In one example, the back pressure detection device is a back pressure sensor. In one example, the control device is a control motherboard, an MCU (Microcontroller Unit), or a microcontroller, etc.

[0034] The target power operating range refers to the exhaust fan operating at a power close to or equal to the target power. Specifically, when the range hood 100 is in the target power operating range, the back pressure value detected by the range hood 100 is within a first back pressure range, and the exhaust fan operates at the target power within a preset first error range. In one example, the minimum value of the first back pressure range is between 150 Pa and 450 Pa, for example, the minimum value of the first back pressure range is 200 Pa, 250 Pa, 300 Pa, 350 Pa, or 400 Pa. The maximum value of the first back pressure range can be the actual back pressure value of the range hood 100 when it is stopped, as measured by the back pressure detection device. The preset first error range is used to limit the actual operating power range of the exhaust fan in the target power operating range. In one example, the preset first error range is within ±8% of the target power, that is, the actual operating power range of the exhaust fan in the target power operating range is (target power - target power) / (target power - target ... 8% to (target power + target power) The actual operating power of the exhaust fan during the target power operation range is between 32.2W and 37.8W (within ±8%). For example, if the target power is 35W, then the actual operating power of the exhaust fan during the target power operation range is between 32.2W and 37.8W. Of course, it is understood that the preset first error range of ±8% of the target power is for illustrative purposes only, and the preset first error range can be set according to actual needs, without specific limitations here.

[0035] To ensure the exhaust fan operates at the target power within a preset first error range, the control device of the range hood 100, based on the detected back pressure value, controls the actual output airflow of the exhaust fan within the target power operating range, thus ensuring the exhaust fan operates at the target power within the preset first error range. It should be noted that the range hood 100 can detect its back pressure value through a back pressure detection device and transmit the detected back pressure value to the control device. Within the target power operating range, different back pressure values ​​correspond to different actual output airflows, i.e., different exhaust fan speeds. The control device controls the exhaust fan speed based on the acquired back pressure value, thereby controlling the actual output airflow of the exhaust fan to maintain its operation at the target power within the preset first error range.

[0036] During the target power operation range, in order to maintain the exhaust fan operating at the target power within a preset first error range, such as... Figure 4 As shown, the operating mode corresponding to the target power operating segment is one or any combination of constant power mode, underpower mode, and overpower mode. In one example, the operating mode corresponding to the target power operating segment is constant power mode; in another example, the operating mode corresponding to the target power operating segment is underpower mode; in yet another example, the operating mode corresponding to the target power operating segment is overpower mode; in one example, the operating mode corresponding to the target power operating segment is a combination of constant power mode and underpower mode; in another example, the operating mode corresponding to the target power operating segment is a combination of underpower mode and overpower mode; in yet another example, the operating mode corresponding to the target power operating segment is a combination of constant power mode, underpower mode, and overpower mode.

[0037] It should be noted that constant power mode refers to the expectation that the actual operating power of the exhaust fan will reach the target power. In constant power mode, the exhaust fan operates at the target power within a preset third error range. This preset third error range is included within the preset first error range, indicating that the actual operating power of the exhaust fan is more precise in constant power mode. For example, the preset third error range could be ±3% of the target power, ±0.5% of the target power, or zero.

[0038] Underpowered mode refers to the exhaust fan operating at a power level lower than the target power. In underpowered mode, the actual operating power of the exhaust fan is less than that in constant power mode, resulting in a smaller rate of change in the back pressure-airflow curve compared to the constant power mode. The rate of change in the back pressure-airflow curve refers to the magnitude of the change in airflow with changes in back pressure, or vice versa. In underpowered mode, the error between the actual operating power of the exhaust fan and the target power is the negative difference between a preset first error range and a preset third error range. It should be noted that the error between the actual operating power of the exhaust fan and the target power refers to the difference between the actual operating power and the target power. Since the preset first error range includes the preset third error range, the difference between the two sets yields a set containing negative values ​​and a set containing positive values. For example, if the first error range is ±8% of the target power, and the preset third error range is ±3% of the target power, then by taking the difference between the preset first error range and the preset third error range, we obtain a set containing negative values ​​from -8% to -3% of the target power, and a set containing positive values ​​from +3% to +8% of the target power. The negative value difference set is then the set of values ​​from -8% to -3% of the target power.

[0039] Over-power mode refers to the operation of the exhaust fan at a power level higher than the target power. In over-power mode, the actual operating power of the exhaust fan is greater than that in constant power mode, resulting in a greater rate of change in the back pressure-airflow curve compared to the constant power mode. The rate of change in the back pressure-airflow curve refers to the magnitude of the change in airflow with changes in back pressure, or vice versa. In over-power mode, the error between the actual operating power of the exhaust fan and the target power is the positive difference between a preset first error range and a preset third error range. It should be noted that the error between the actual operating power of the exhaust fan and the target power refers to the difference between the actual operating power and the target power. Since the preset first error range includes the preset third error range, the difference between the preset first and third error ranges yields a set containing negative values ​​and a set containing positive values. For example, if the first error range is ±8% of the target power, and the preset third error range is ±0.5% of the target power, then by taking the difference between the preset first error range and the preset third error range, we obtain a set containing negative values ​​from -8% to -0.5% of the target power, and a set containing positive values ​​from +0.5% to +8% of the target power. The difference set of positive values ​​is then the set of positive values ​​from +0.5% to +8% of the target power.

[0040] The target airflow operating range refers to the exhaust fan operating at a speed close to or equal to the target airflow. Specifically, when the range hood 100 is in the target airflow operating range, the back pressure value detected by the range hood 100 is within the second back pressure range, and the exhaust fan operates at the target airflow within a preset second error range. In one example, the second back pressure range is between 1 Pa and 300 Pa. In another example, the second back pressure range can also be between 1 Pa and 250 Pa, or between 1 Pa and 200 Pa. The preset second error range is used to limit the actual operating airflow range of the exhaust fan in the target airflow operating range. In one example, the preset second error range is within ±15% of the target airflow, that is, the actual operating airflow range of the exhaust fan in the target airflow operating range is (target airflow - target airflow). 15% to (target air volume + target air volume) The target airflow is between ±15% of the target airflow. For example, if the target airflow is 11 cubic meters per minute, the actual operating power of the exhaust fan during the target airflow range is 9.35 cubic meters per minute to 12.65 cubic meters per minute. If the target airflow is 12 cubic meters per minute, the actual operating power of the exhaust fan during the target airflow range is 10.2 cubic meters per minute to 13.8 cubic meters per minute. If the target airflow is 13 cubic meters per minute, the actual operating power of the exhaust fan during the target airflow range is 11.05 cubic meters per minute to 14.95 cubic meters per minute. It is understood that the preset second error range of ±15% of the target airflow is for illustrative purposes only, and the preset second error range can be set according to actual needs, without specific limitations here. It should be noted that the target airflow is much smaller than the airflow corresponding to the target speed. For example, the airflow corresponding to the target speed is between 30 cubic meters per minute and 50 cubic meters per minute.

[0041] To ensure the exhaust fan operates at the target airflow within a preset second error range, during the target airflow operation segment, the control device of the range hood 100 controls the input power of the exhaust fan based on the detected back pressure value, thereby ensuring the exhaust fan operates at the target airflow within the preset second error range. It should be noted that the range hood 100 can detect its back pressure value through a back pressure detection device and transmit the detected back pressure value to the control device. Specifically, during the target airflow operation segment, different back pressure values ​​correspond to different input power values, i.e., different exhaust fan speeds. The control device controls the input power of the exhaust fan based on the acquired back pressure value, thereby controlling the exhaust fan speed to maintain the exhaust fan operating at the target airflow within the preset second error range.

[0042] In the target airflow operation range, to maintain the exhaust fan operating at the target power within the preset second error range, the corresponding operating modes for the target airflow operation range are constant airflow mode and intermediate extreme value mode (e.g., ...). Figure 5 (as shown) and oscillation modes (such as) Figure 6 (As shown) One or any combination of the following. In one example, the operating mode corresponding to the target airflow segment is constant airflow mode; in one example, the operating mode corresponding to the target airflow segment is intermediate extreme value mode; in one example, the operating mode corresponding to the target airflow segment is oscillation mode; in one example, the operating mode corresponding to the target airflow segment is a combination of oscillation mode and intermediate extreme value mode; in one example, the operating mode corresponding to the target airflow segment is a combination of intermediate extreme value mode and oscillation mode; in one example, the operating mode corresponding to the target airflow segment is a combination of constant airflow mode and oscillation mode; in one example, the operating mode corresponding to the target airflow segment is any combination of constant airflow mode, intermediate extreme value mode and oscillation mode.

[0043] It should be noted that constant air volume mode refers to the expectation that the actual output air volume of the smoke exhaust fan will reach the target air volume. In constant air volume mode, the smoke exhaust fan operates within a preset fourth error range according to the target air volume. This preset fourth error range is included within the preset second error range, indicating that the actual output air volume of the smoke exhaust fan is more precise in constant air volume mode. For example, the preset fourth error range may be ±5% of the target air volume, ±2% of the target power, or zero.

[0044] The intermediate extreme value mode refers to the operation of the smoke exhaust fan at an actual output air volume higher than the target air volume. In other words, in the intermediate extreme value mode, the actual output air volume of the smoke exhaust fan shifts towards exceeding the target air volume; or it operates at an actual output air volume lower than the target air volume. It should be noted that in the intermediate extreme value mode, the error in the actual output air volume of the smoke exhaust fan relative to the target air volume is the difference between a preset second error range and a preset fourth error range. Specifically, the error in the actual output air volume of the smoke exhaust fan relative to the target air volume refers to the difference between the actual output air volume of the smoke exhaust fan and the target air volume. Specifically, since the preset second error range includes the preset fourth error range, the difference between the preset second error range and the preset fourth error range results in a set containing negative values ​​and a set containing positive values. When the actual output air volume of the smoke exhaust fan shifts towards exceeding the target air volume, the error in the actual output air volume of the smoke exhaust fan relative to the target air volume is a set of positive values ​​(i.e., a set containing positive values). When the actual output airflow of the smoke exhaust fan deviates from the target airflow, the error in the actual output airflow relative to the target airflow is a set of negative values ​​(i.e., a set containing negative values). For example, if the preset second error range is ±15% of the target airflow and the fourth error range is ±2% of the target power, then the difference between the preset second and fourth error ranges yields a set containing negative values ​​from -15% of the target airflow to -2% of the target power, and a set containing positive values ​​from +2% of the target airflow to +15% of the target power. Similarly, when the actual output airflow of the smoke exhaust fan deviates from the target airflow, the error in the actual output airflow relative to the target airflow is between +2% of the target airflow and +15% of the target power. Likewise, when the actual output airflow of the smoke exhaust fan deviates from the target airflow, the error in the actual output airflow relative to the target airflow is between -15% of the target airflow and -2% of the target power.

[0045] The oscillation mode refers to the actual output air volume of the smoke exhaust fan oscillating back and forth. In other words, in oscillation mode, the output air volume of the smoke exhaust fan oscillates between being less than and greater than the target air volume. It should be noted that in oscillation mode, the error between the actual output air volume of the smoke exhaust fan and the target air volume is the difference between a preset second error range and a preset fourth error range. Specifically, since the preset second error range includes the preset fourth error range, the difference between the two sets yields a set containing negative values ​​and a set containing positive values. For example, if the preset second error range is ±15% of the target air volume and the fourth error range is ±5% of the target power, the difference between the two sets yields a set containing negative values ​​from -15% of the target air volume to -5% of the target power, and a set containing positive values ​​from +5% of the target air volume to +15% of the target power. The actual output air volume of the smoke exhaust fan has an error of -15% to -5% of the target air volume and +5% to +15% of the target power.

[0046] To accommodate different cooking processes or methods, in one example, the range hood 100 includes two or more operating speeds. Each operating speed corresponds to a different target power and a different target airflow. For example, in one example, the range hood 100 includes three speeds: low, medium, and high. For example, in one example, the low speed corresponds to a target power of 35W and a target airflow of 11 cubic meters per minute. The medium speed corresponds to a target power of 37W and a target airflow of 12 cubic meters per minute. The high speed corresponds to a target power of 39W and a target airflow of 13 cubic meters per minute.

[0047] During gear switching, the operation is adjusted according to the current operating stage of the exhaust fan.

[0048] If, within the target power operating range, the range hood 100 switches from its current operating setting to the next, the exhaust fan switches from operating at the target power corresponding to the current setting to operating at the target power corresponding to the next setting. Similarly, if, within the target airflow operating range, the range hood 100 switches from its current operating setting to the next, the exhaust fan switches from operating at the target airflow corresponding to the current setting to operating at the target airflow corresponding to the next setting.

[0049] The range hood 100 provided in the embodiments of this application includes an air intake 101, an air duct 103, and an exhaust fan. The air intake 101 is connected to the air duct 103, and the exhaust fan is disposed within the air duct 103. The operation of the exhaust fan includes at least a rapid start-up operation phase. The duration of the rapid start-up operation phase is a preset duration. During the rapid start-up operation phase, the back pressure value of the range hood is configured to a target back pressure value that is significantly greater than the actual back pressure value of the range hood, and the exhaust fan operates at a target speed corresponding to the target back pressure value. This application, by setting a rapid start-up operation phase for the range hood, especially in the initial stage when the range hood is first powered on, can quickly reduce the back pressure value of the range hood, forming a good airflow organization. This prepares the range hood to quickly achieve a good smoke extraction effect, improves the response efficiency of the range hood, and prepares for the subsequent low-speed or low-power operation of the exhaust fan, reducing energy consumption. It can also prevent air duct blockage and backflow of fumes.

[0050] During the operation of the range hood 100, the exhaust fan's operation includes at least a target power operating segment corresponding to a first back pressure range and a target airflow operating segment corresponding to a second back pressure range. Specifically, within the target power operating segment, the back pressure value detected by the range hood 100 is within the first back pressure range, and the exhaust fan operates at the target power within a preset first error range. Within the target airflow operating segment, the back pressure value detected by the range hood 100 is within the second back pressure range, and the exhaust fan operates at the target airflow within a preset second error range. This application divides the smoke exhaust operation of the range hood 100 into a target power operation segment and a target air volume operation segment. The target power operation segment drives the airflow on the smoke output side of the range hood 100, reducing the back pressure of the range hood 100. When the back pressure of the range hood 100 drops to a certain value, it switches to the target air volume operation segment so that the exhaust fan maintains operation at the target air volume. As the airflow flows, the lower the back pressure of the range hood 100, the lower the input power required to maintain operation at the target air volume. This achieves good airflow organization by utilizing the target power operation segment, improving the smoke extraction effect, and reduces power consumption by utilizing the target air volume operation segment.

[0051] In one embodiment, this application also provides a control method for a range hood 100, applied to the range hood 100, which includes an air intake 101, an air duct 103, and an exhaust fan; the air intake 101 is connected to the air duct 103; the exhaust fan is disposed within the air duct 103, such as... Figure 7 As shown, it includes the following steps: Step S71: Configure the back pressure value of the range hood as the target back pressure value. The target back pressure value is significantly larger than the actual back pressure value of the range hood.

[0052] Step S73: Control the exhaust fan to run at the target speed according to the corresponding target back pressure value.

[0053] In some embodiments, the following steps are also included: Step S75: Obtain the back pressure value of the range hood 100. The control device of the range hood 100 obtains the back pressure value collected by the back pressure detection device of the range hood 100.

[0054] Step S77: If the back pressure value is determined to be within the first back pressure range, the exhaust fan is controlled to enter the target power operating segment to operate at the target power within a preset first error range. If the control device of the range hood 100 determines that the back pressure value is within the first back pressure range, it controls the exhaust fan to enter the target power operating segment to operate at the target power within a preset first error range. In one example, the control device of the range hood 100 controls the actual output airflow of the exhaust fan based on the obtained back pressure value, so that the exhaust fan operates at the target power within the preset first error range.

[0055] Step S79: If the back pressure value is determined to be within the second back pressure range, the exhaust fan is controlled to enter the target airflow operating segment to operate according to the target airflow within the preset second error range. If the control device of the range hood 100 determines that the back pressure value is within the second back pressure range, it controls the exhaust fan to enter the target airflow operating segment to operate according to the target airflow within the preset second error range. In one example, the control device of the range hood 100 controls the input power of the exhaust fan based on the obtained back pressure value to make the exhaust fan operate according to the target airflow within the preset second error range. It should be noted that in one embodiment, the minimum value of the first back pressure range is greater than the maximum value of the second back pressure range; the minimum value of the first back pressure range is between 150 Pa and 450 Pa; the preset first error range is between ±8% of the target power; the second back pressure range is between 1 Pa and 300 Pa; and the preset second error range is between ±15% of the target airflow.

[0056] It should be noted that the control method of the range hood 100 in this application has the same steps as that in the range hood 100 of this application. For details, please refer to the range hood 100 of this application. It will not be repeated here.

[0057] It should be understood that, although Figure 7 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 7At least some of the steps in the process may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.

[0058] 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.

[0059] The embodiments described above are merely illustrative of 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 patent application. 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 range hood, comprising an air intake, an air duct, and an exhaust fan; wherein the air intake is connected to the air duct; and the exhaust fan is disposed within the air duct, characterized in that, During the operation of the range hood, the working process of the exhaust fan includes at least a rapid start-up operation phase; the duration of the rapid start-up operation phase is a preset duration. During the rapid start-up operation phase, the back pressure value of the range hood is configured as a target back pressure value; the target back pressure value is greater than the actual back pressure value of the range hood. The exhaust fan operates at a target speed corresponding to the target back pressure value; If the preset back pressure value is within the first back pressure range, during the operation of the range hood, the working process of the exhaust fan also includes a target power operation segment corresponding to the first back pressure range and a target air volume operation segment corresponding to the second back pressure range. If the preset back pressure value is within the second back pressure range, during the operation of the range hood, the operation of the exhaust fan also includes a target air volume operation segment corresponding to the second back pressure range; within the target power operation segment, if the back pressure value detected by the range hood is within the first back pressure range, the exhaust fan operates at the target power within a preset first error range. Within the target airflow operating range, the back pressure value detected by the range hood is within the second back pressure range, and the exhaust fan operates within the preset second error range according to the target airflow; the target airflow is less than the airflow corresponding to the target rotation speed.

2. The range hood according to claim 1, characterized in that, The range hood simulates and calculates the theoretical time it takes for the back pressure value of the range hood to decrease from the actual back pressure value to the preset back pressure value when the exhaust fan is running at the target speed, and configures the theoretical time as the preset time.

3. The range hood according to claim 2, characterized in that, When the actual back pressure value of the range hood detected by the range hood is greater than or equal to the preset back pressure value, the fast start operation segment is activated. If the actual back pressure value detected by the range hood is less than the preset back pressure value, the fast start operation segment will not be activated. The target back pressure value is between 250 bar and 350 bar.

4. The range hood according to claim 1, characterized in that, The minimum value of the first back pressure range is greater than the maximum value of the second back pressure range; the minimum value of the first back pressure range is between 150 Pa and 450 Pa.

5. The range hood according to claim 1, characterized in that, The range hood includes two or more operating speeds; Each of the aforementioned operating speeds corresponds to a different target power; and each of the aforementioned operating speeds corresponds to a different target airflow. Within the target power operating range, the range hood switches from the current operating level to the next operating level, and the exhaust fan switches from the target power corresponding to the current operating level to the target power corresponding to the next operating level. Within the target airflow operating range, the range hood switches from the current operating level to the next operating level, and the exhaust fan switches from the target airflow corresponding to the current operating level to the target airflow corresponding to the next operating level.

6. The range hood according to claim 1, characterized in that, The preset first error range is between ±8% of the target power; the operating mode corresponding to the target power operating segment includes one or any combination of constant power mode, underpower mode and overpower mode; The constant power mode refers to the exhaust fan operating at the target power within a preset third error range; the preset third error range is included in the preset first error range. The rate of change of the back pressure-airflow curve corresponding to the underpower mode is less than the rate of change of the back pressure-airflow curve corresponding to the constant power mode; in the underpower mode, the error of the actual operating power of the exhaust fan relative to the target power is the negative numerical difference between the preset first error range and the preset third error range; The rate of change of the back pressure-airflow curve corresponding to the overpower mode is greater than the rate of change of the back pressure-airflow curve corresponding to the constant power mode; in the overpower mode, the error of the actual operating power of the exhaust fan relative to the target power is the positive difference between the preset first error range and the preset third error range.

7. The range hood according to claim 1, characterized in that, The second back pressure range is between 1 Pa and 300 Pa; the preset second error range is between ±15% of the target air volume; the operating mode corresponding to the target air volume operating segment is one or any combination of constant air volume mode, intermediate extreme value mode and oscillation mode; The constant air volume mode refers to the smoke exhaust fan operating within a preset fourth error range according to the target air volume; the preset fourth error range is included in the preset second error range. In the intermediate extreme mode, the actual output air volume of the smoke exhaust fan shifts to be greater than or less than the target air volume; in the intermediate extreme mode, the error of the actual output air volume of the smoke exhaust fan relative to the target air volume is the difference between the preset second error range and the preset fourth error range; In the oscillation mode, the actual output air volume of the smoke exhaust fan oscillates between being less than the target air volume and being greater than the target air volume; in the oscillation mode, the error of the actual output air volume of the smoke exhaust fan corresponding to the target air volume is the difference between the preset second error range and the preset fourth error range.

8. The range hood according to claim 1, characterized in that, The range hood also includes an air collection box; the air collection box has a through groove for accommodating the air intake; the air velocity at the air intake is between 11 cubic meters per minute and 18 cubic meters per minute.

9. A control method for a range hood, applied to a range hood, the range hood comprising an air intake, an air duct, and an exhaust fan; the air intake is connected to the air duct; the exhaust fan is disposed within the air duct, characterized in that... During the operation of the range hood, the working process of the exhaust fan includes at least a rapid start-up operation phase; the duration of the rapid start-up operation phase is a preset duration. The control method for the range hood includes the following steps: During the rapid start-up operation phase, the back pressure value of the range hood is configured as a target back pressure value; the target back pressure value is greater than the actual back pressure value of the range hood. The exhaust fan is controlled to operate at the target speed corresponding to the target back pressure value; If the preset back pressure value is within the first back pressure range, during the operation of the range hood, the working process of the exhaust fan also includes a target power operation segment corresponding to the first back pressure range and a target air volume operation segment corresponding to the second back pressure range. If the preset back pressure value is within the second back pressure range, during the operation of the range hood, the operation of the exhaust fan also includes a target air volume operation segment corresponding to the second back pressure range; within the target power operation segment, if the back pressure value detected by the range hood is within the first back pressure range, the exhaust fan operates at the target power within a preset first error range. Within the target airflow operating range, the back pressure value detected by the range hood is within the second back pressure range, and the exhaust fan operates within the preset second error range according to the target airflow; the target airflow is less than the airflow corresponding to the target rotation speed.

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