Range hood and control method of range hood

Abstract

The application relates to a range hood and a control method of the range hood. The range hood comprises a shell, an air duct arranged in the shell, and an exhaust fan arranged in the air duct. During operation of the range hood, the working process of the exhaust fan at least comprises a first target air volume operation section and a second target air volume operation section. In the first target air volume operation section, the back pressure value detected by the range hood is within a first back pressure range, and the exhaust fan operates according to the first target air volume within a preset first error range. In the second target air volume operation section, the back pressure value detected by the range hood is within a second back pressure range, and the exhaust fan operates according to the second target air volume within a preset second error range. According to the application, two target air volume operation sections are arranged, the exhaust air volume is adjusted through the two target air volume operation sections, the exhaust air volume can be operated at the first target air volume and the second target air volume under different back pressures, the exhaust air volume is reduced under low back pressure, and therefore the energy consumption of the exhaust fan is reduced.

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 solution of increasing the exhaust volume to improve the fume extraction performance of range hoods. Currently, the exhaust volume of range hoods has increased from 16 cubic meters per minute to 20 cubic meters per minute, 24 cubic meters per minute, and even 26 cubic meters per minute. However, increasing the exhaust volume of range hoods only meets the requirements of space ventilation. Without good airflow organization, simply increasing the exhaust volume cannot reduce oil 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 house, resulting in poor social benefits. The inventors have discovered that traditional technology has at least the following problems: Traditional range hoods operate at high exhaust volumes, increasing energy consumption. Summary of the Invention

[0003] Therefore, it is necessary to provide a range hood and its control method that can reduce energy consumption in response to the above-mentioned technical problems.

[0004] A range hood includes a housing, an air duct is provided inside the housing, and an exhaust fan is provided inside the air duct. During the operation of the range hood, the operation process of the exhaust fan includes at least a first target air volume operation segment corresponding to a first back pressure range and a second target air volume operation segment corresponding to a second back pressure range.

[0005] Within the first target airflow operating range, the back pressure value detected by the range hood is within the first back pressure range, and the exhaust fan operates within the preset first error range according to the first target airflow.

[0006] Within the second 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 second target airflow.

[0007] In one embodiment, the maximum value of the first back pressure range is equal to the minimum value of the second back pressure range; the first target air volume is less than the second target air volume.

[0008] In one embodiment, the first back pressure ranges from 1 Pa to 50 Pa; the second back pressure ranges from 50 Pa to 300 Pa; and the first target air volume is 30% to 60% of the rated air volume of the exhaust fan.

[0009] In one embodiment, the range hood includes two or more operating settings;

[0010] Each operating setting corresponds to a different first target air volume and a different second target air volume;

[0011] Within the first target air volume operating segment, the range hood switches from the current operating level to the next operating level, and the exhaust fan switches from the first target air volume corresponding to the current operating level to the first target air volume corresponding to the next operating level;

[0012] During the second target air volume operation segment, the range hood switches from the current operating level to the next operating level, and the exhaust fan switches from the second target air volume corresponding to the current operating level to the second target air volume corresponding to the next operating level.

[0013] In one embodiment, a first error range is preset between ±15% of the first target air volume; the operating mode corresponding to the first target air volume operating segment is one or any combination of constant air volume mode, intermediate extreme value mode and oscillation mode;

[0014] Among them, the constant air volume mode is that the smoke exhaust fan operates according to the target air volume within the preset third error range; the preset third error range is included in the preset first error range;

[0015] In the intermediate extreme mode, the actual output air volume of the smoke exhaust fan deviates from 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 first error range and the preset third error range;

[0016] 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 first error range and the preset third error range.

[0017] In one embodiment, a second error range is preset between ±15% of the second target air volume; the operating mode corresponding to the second target air volume operating segment is one or any combination of constant air volume mode, intermediate extreme value mode and oscillation mode.

[0018] 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;

[0019] In the intermediate extreme mode, the actual output air volume of the smoke exhaust fan deviates from 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;

[0020] 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.

[0021] In one embodiment, during the operation of the range hood, the working process of the exhaust fan includes a target power operating segment corresponding to the third back pressure range;

[0022] Within the target power operating range, the back pressure value detected by the range hood is within the third back pressure range, and the exhaust fan operates at the target power within the preset fifth error range.

[0023] In one embodiment, the minimum value of the third back pressure range is between 300 Pa and 450 Pa.

[0024] In one embodiment, the fifth 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;

[0025] Among them, the constant power mode means that the exhaust fan operates at the target power within the preset sixth error range; the preset sixth error range is included in the preset fifth error range;

[0026] 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 fifth error range and the preset sixth error range.

[0027] 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 fifth error range and the preset sixth error range.

[0028] In one embodiment, the application is to a range hood, which includes a housing, an air duct inside the housing, and an exhaust fan inside the air duct, and includes the following steps:

[0029] Obtain the back pressure value of the range hood;

[0030] If the back pressure value is determined to be within the first back pressure range, the exhaust fan is controlled to enter the first target air volume operation segment so as to operate within the preset first error range according to the first target air volume;

[0031] If the back pressure value is determined to be within the second back pressure range, the exhaust fan is controlled to enter the second target air volume operation segment, so as to operate according to the second target air volume within the preset second error range.

[0032] One of the above technical solutions has the following advantages and beneficial effects:

[0033] The range hoods provided in the embodiments of this application include a housing, an air duct inside the housing, and an exhaust fan inside the air duct. During the operation of the range hood, the exhaust fan's operation includes at least a first target airflow operating segment and a second target airflow operating segment. In the first target airflow operating segment, the back pressure value detected by the range hood is within a first back pressure range, and the exhaust fan operates at the first target airflow within a preset first error range. In the second target airflow operating segment, the back pressure value detected by the range hood is within a second back pressure range, and the exhaust fan operates at the second target airflow within a preset second error range. This application, by setting two target airflow operating segments, adjusts the exhaust airflow through these two segments. It can operate at both the first and second target airflows under different back pressures. When the back pressure is low, the exhaust airflow is reduced, thereby reducing the energy consumption of the exhaust fan. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the range hood in the embodiments of this application.

[0035] Figure 2 This is a schematic diagram of the operation process of the range hood in the embodiments of this application.

[0036] Figure 3 This is a schematic diagram of the second target airflow operating mode of the range hood in the embodiments of this application.

[0037] Figure 4 This is a schematic diagram of the second target airflow operating mode of the range hood in the embodiments of this application.

[0038] Figure 5 This is another schematic diagram illustrating the operation of the range hood in this embodiment of the application.

[0039] Figure 6 This is a schematic diagram of the operating mode of the first target air volume operating segment of the range hood in the embodiments of this application.

[0040] Figure 7 This is a flowchart illustrating the control method of the range hood in an embodiment of this application. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] 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 a housing 101, within which a duct 103 is provided, and a range hood (not shown in the figure) is installed within the duct 103. The air intake of the range hood is connected to the duct 103, and the range hood 100 draws in cooking fumes through the air intake and exhausts them into the duct 103. The duct 103 is connected to the outside environment or the main air duct 103 of the building, thereby expelling cooking fumes from the building. It should be noted that the air intake of the range hood 100 of 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 of the range hood 100 is greater than that generated at an air intake with a larger diameter, thus facilitating the extraction of cooking fumes.

[0044] 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 draw out the cooking fumes. Figure 2 As shown, during the operation of the range hood 100, the working process of the exhaust fan includes at least a first target airflow operating segment corresponding to a first back pressure range and a second 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 is operating at the target airflow. 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.

[0045] This application distinguishes between a first target airflow operating segment and a second target airflow operating segment based on back pressure values. Specifically, when the back pressure value of the range hood 100 is within the first back pressure range, the exhaust fan of the range hood 100 enters the first target airflow operating segment; when the back pressure value of the range hood 100 is within the second back pressure range, the exhaust fan of the range hood 100 enters the second 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 first target airflow operating segment or the second target airflow operating segment based on the back pressure value. In one example, the back pressure detection device is a back pressure sensor. In one example, the control device is a control motherboard, MCU (Microcontroller Unit), or microcontroller, etc. In one example, the maximum value of the first back pressure range is less than the minimum value of the second back pressure range. In another example, the maximum value of the first back pressure range equals the minimum value of the second back pressure range, meaning the first and second back pressure ranges are connected. When the maximum value of the first back pressure range is less than the minimum value of the second back pressure range, to reduce the energy consumption of the range hood, in one example, the first target airflow is less than the second target airflow. In other words, when the back pressure of the range hood becomes very low, it indicates that the airflow speed within the duct is very fast. At this point, reducing the exhaust airflow of the exhaust fan can still ensure effective smoke extraction. Therefore, when the back pressure of the range hood drops to the first back pressure range, the exhaust fan is controlled to operate at the first target airflow to reduce energy consumption.

[0046] The first target airflow operating segment refers to the exhaust fan operating at a speed close to or equal to the first target airflow. Specifically, when the range hood 100 is in the first target airflow 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 first target airflow within a preset first error range. In one example, the first back pressure range is between 1 Pa and 50 Pa. In another example, the first back pressure range can also be between 1 Pa and 75 Pa, or between 1 Pa and 25 Pa. The preset first error range is used to limit the actual working airflow range of the exhaust fan in the first target airflow operating segment. In one example, the preset first error range is within ±15% of the first target airflow, that is, the actual working airflow range of the exhaust fan in the first target airflow operating segment is between (first target airflow - first target airflow * 15%) and (first target airflow + first target airflow * 15%). In one example, the first target air volume is 30% to 60% of the rated air volume of the smoke exhaust fan. For example, the first target air volume is 40% or 50% of the rated air volume of the smoke exhaust fan. It should be noted that the rated air volume is the maximum air volume that the smoke exhaust fan can output.

[0047] To ensure that the exhaust fan operates within a preset first error range and at the first target airflow, during the first 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 that the exhaust fan operates within the preset first error range and at the first target airflow. 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 first 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 within the preset first error range and at the first target airflow.

[0048] In the first target airflow operation segment, to maintain the exhaust fan operating at the target power within a preset first error range, the corresponding operating modes for the first target airflow operation segment are constant airflow mode and intermediate extreme value mode (e.g., ...). Figure 3 (as shown) and oscillation modes (such as) Figure 4 (As shown) One or any combination of the following. In one example, the operating mode corresponding to the first target airflow segment is constant airflow mode; in one example, the operating mode corresponding to the first target airflow segment is intermediate extreme value mode; in one example, the operating mode corresponding to the first target airflow segment is oscillation mode; in one example, the operating mode corresponding to the first target airflow segment is a combination of oscillation mode and intermediate extreme value mode; in one example, the operating mode corresponding to the first target airflow segment is a combination of intermediate extreme value mode and oscillation mode; in one example, the operating mode corresponding to the first target airflow segment is a combination of constant airflow mode and oscillation mode; in one example, the operating mode corresponding to the first target airflow segment is any combination of constant airflow mode, intermediate extreme value mode and oscillation mode.

[0049] It should be noted that the constant air volume mode refers to the expectation that the actual output air volume of the smoke exhaust fan will reach the first target air volume. In constant air volume mode, the smoke exhaust fan operates within a preset third error range according to the first target air volume. The preset third error range is included within the preset first 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 third error range may be ±4% of the first target air volume, ±3% of the target power, or zero.

[0050] The intermediate extreme value mode refers to the operation of the smoke exhaust fan at an actual output air volume higher than the first 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 first target air volume; or it operates at an actual output air volume lower than the first 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 first target air volume is the difference between a preset first error range and a preset third error range. Specifically, since the preset first error range includes the preset third error range, the difference between the preset first error range and the preset third error range yields a set containing negative values ​​and a set containing positive values. When the actual output airflow of the smoke exhaust fan deviates from the first target airflow, the error in the actual output airflow of the smoke exhaust fan relative to the first target airflow 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 first target airflow, the error in the actual output airflow of the smoke exhaust fan relative to the first target airflow is a set of negative values ​​(i.e., a set containing negative values). For example, if the preset first error range is ±15% of the first target airflow and the third error range is ±3% of the target power, then the difference between the preset first error range and the preset third error range yields a set containing negative values ​​ranging from -15% of the first target airflow to -3% of the target power, and a set containing positive values ​​ranging from +3% of the first target airflow to +15% of the target power. When the actual output airflow of the smoke exhaust fan deviates from the first target airflow, the error in the actual output airflow of the smoke exhaust fan relative to the first target airflow is between +3% of the first target airflow and +15% of the target power. If the actual output air volume of the smoke exhaust fan deviates from the first target air volume, the error between the actual output air volume of the smoke exhaust fan and the first target air volume is from -15% of the first target air volume to -3% of the target power.

[0051] 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 first target air volume. It should be noted that in oscillation mode, the error in the actual output air volume of the smoke exhaust fan relative to the first target air volume is the difference between a preset first error range and a preset third error range. Specifically, since the preset first error range includes the preset third error range, the difference between the preset first error range and the preset third error range results in a set containing negative values ​​and a set containing positive values. For example, the preset first error range is ±15% of the first target air volume, and the third error range is ±3% of the target power. After subtracting the preset first error range and the preset third error range, the set containing negative values ​​is obtained as -15% to -3% of the first target air volume and the set containing positive values ​​is obtained as +3% to +15% of the first target air volume and the set containing positive values. The actual output air volume of the exhaust fan corresponds to an error of -15% to -3% of the first target air volume and the set containing +3% to +15% of the first target air volume and the set containing ...

[0052] The second target airflow operating segment refers to the exhaust fan operating at a speed close to or equal to the second target airflow. Specifically, when the range hood 100 is in the second 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 second target airflow within a preset second error range. In one example, the second back pressure range is between 50 Pa and 300 Pa. In another example, the second back pressure range can also be between 75 Pa and 325 Pa, or between 25 Pa and 275 Pa. The preset second error range is used to limit the actual working airflow range of the exhaust fan in the second target airflow operating segment. In one example, the preset second error range is within ±15% of the second target airflow, that is, the actual working airflow range of the exhaust fan in the second target airflow operating segment is between (second target airflow - second target airflow * 15%) and (second target airflow + second target airflow * 15%). For example, if the second target airflow is 11 cubic meters per minute, then the actual operating power range of the exhaust fan during the second target airflow range is 9.35 cubic meters per minute to 12.65 cubic meters per minute. If the second target airflow is 12 cubic meters per minute, then the actual operating power range of the exhaust fan during the second target airflow range is 10.2 cubic meters per minute to 13.8 cubic meters per minute. If the second target airflow is 13 cubic meters per minute, then the actual operating power range of the exhaust fan during the second 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 second target airflow is for illustrative purposes only, and the preset second error range can be set according to actual needs; no specific limitation is made here.

[0053] To ensure the exhaust fan operates within a preset second error range and at the second target airflow, during the second 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 within the preset second error range and at the second target airflow. 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. During the second 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 within the preset second error range and at the second target airflow.

[0054] In the second target airflow operation segment, to maintain the exhaust fan operating at the target power within the preset second error range, the corresponding operating modes for the second target airflow operation segment are constant airflow mode and intermediate extreme value mode (e.g., Figure 3 (as shown) and oscillation modes (such as) Figure 4(As shown) One or any combination of the following. In one example, the operating mode corresponding to the second target airflow segment is constant airflow mode; in one example, the operating mode corresponding to the second target airflow segment is intermediate extreme value mode; in one example, the operating mode corresponding to the second target airflow segment is oscillation mode; in one example, the operating mode corresponding to the second target airflow segment is a combination of oscillation mode and intermediate extreme value mode; in one example, the operating mode corresponding to the second target airflow segment is a combination of intermediate extreme value mode and oscillation mode; in one example, the operating mode corresponding to the second target airflow segment is a combination of constant airflow mode and oscillation mode; in one example, the operating mode corresponding to the second target airflow segment is any combination of constant airflow mode, intermediate extreme value mode and oscillation mode.

[0055] It should be noted that the constant air volume mode refers to the expectation that the actual output air volume of the smoke exhaust fan will reach the second target air volume. In constant air volume mode, the smoke exhaust fan operates within a preset fourth error range according to the second target air volume. The 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 accurate in constant air volume mode. For example, the preset fourth error range may be ±5% of the second target air volume, ±2% of the target power, or zero.

[0056] The intermediate extreme value mode refers to the operation of the smoke exhaust fan at an actual output air volume higher than the second 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 second target air volume; or it operates at an actual output air volume lower than the second 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 second 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 preset second error range and the preset fourth error range yields a set containing negative values ​​and a set containing positive values. When the actual output airflow of the smoke exhaust fan deviates from the second target airflow, the error in the actual output airflow of the smoke exhaust fan relative to the second target airflow 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 second target airflow, the error in the actual output airflow of the smoke exhaust fan relative to the second 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 second target airflow, and the fourth error range is ±2% of the target power, then after taking the difference between the preset second error range and the preset fourth error range, the set containing negative values ​​is from -15% of the second target airflow to -2% of the target power, and the set containing positive values ​​is from +2% of the second target airflow to +15% of the target power. When the actual output airflow of the smoke exhaust fan deviates from the second target airflow, the error in the actual output airflow of the smoke exhaust fan relative to the second target airflow is from +2% of the second target airflow to +15% of the target power. If the actual output air volume of the smoke exhaust fan deviates from the second target air volume, the error between the actual output air volume of the smoke exhaust fan and the second target air volume is between -15% of the second target air volume and -2% of the target power.

[0057] 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 second target air volume. It should be noted that in oscillation mode, the error in the actual output air volume of the smoke exhaust fan relative to the second 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 preset second error range and the preset fourth error range results in a set containing negative values ​​and a set containing positive values. For example, the preset second error range is ±15% of the second target air volume, and the fourth error range is ±5% of the target power. After subtracting the preset second error range and the preset fourth error range, the set containing negative values ​​is obtained as -15% to -5% of the second target air volume and the set containing positive values ​​is obtained as +5% to +15% of the second target air volume and the set containing positive values. The actual output air volume of the exhaust fan corresponds to an error of -15% to -5% of the second target air volume and the set containing +5% to +15% of the second target air volume and the set containing positive values.

[0058] In one example, such as Figure 5 As shown, during the operation of the range hood, the working process of the exhaust fan includes a target power operating segment corresponding to the third back pressure range. Within the target power operating segment, the back pressure value detected by the range hood is within the third back pressure range, and the exhaust fan operates at the target power within the preset fifth error range.

[0059] 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 the third back pressure range, and the exhaust fan operates at the target power within the preset fifth error range. In one example, the minimum value of the third back pressure range is between 300 Pa and 450 Pa, for example, the minimum value of the third back pressure range is 350 Pa or 400 Pa. The maximum value of the third 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 fifth 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 fifth error range is between ±8% of the target power, that is, the actual operating power range of the exhaust fan in the target power operating range is between (target power - target power * 8%) and (target power + target power * 8%). For example, if the target power is 35W, then the actual operating power range of the exhaust fan during the target power operation range is 32.2W to 37.8W. It is understood that the preset fifth error range of ±8% of the target power is for illustrative purposes only; the preset fifth error range can be set according to actual needs and is not specifically limited here.

[0060] To ensure the exhaust fan operates at the target power within a preset fifth 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. 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 fifth error range.

[0061] During the target power operation range, in order to maintain the exhaust fan operating at the target power within the preset fifth error range, such as... Figure 6As 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.

[0062] 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 sixth error range. This preset sixth error range is included within the preset fifth error range, indicating that the actual operating power of the exhaust fan is more precise in constant power mode. For example, the preset sixth error range could be ±3% of the target power, ±0.5% of the target power, or zero.

[0063] 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 the preset fifth and sixth error ranges. 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 fifth error range includes the preset sixth error range, the difference between the preset fifth and sixth 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 sixth error range is ±1% of the target power, then by taking the difference between the preset fifth and sixth error ranges, we obtain a set containing negative values ​​from -8% to -1% of the target power, and a set containing positive values ​​from +1% to +8% of the target power. The negative value difference set is then the set of values ​​from -8% to -1% of the target power.

[0064] 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 the preset fifth and sixth error ranges. 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 fifth error range includes the preset sixth error range, the difference between the preset fifth and sixth 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 sixth error range is ±0.5% of the target power, then by taking the difference between the preset fifth and sixth error ranges, 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 values ​​from +0.5% to +8% of the target power.

[0065] 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.

[0066] During gear switching, the operation is adjusted according to the current operating stage of the exhaust fan.

[0067] 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. If, within the second 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 second target airflow corresponding to the current setting to operating at the second target airflow corresponding to the next setting. If, within the second 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.

[0068] The range hoods provided in the embodiments of this application include a housing, an air duct inside the housing, and an exhaust fan inside the air duct. During operation, the exhaust fan's operation includes at least a first target airflow operating segment and a second target airflow operating segment. In the first target airflow operating segment, the back pressure value detected by the range hood is within a first back pressure range, and the exhaust fan operates at the first target airflow within a preset first error range. In the second target airflow operating segment, the back pressure value detected by the range hood is within a second back pressure range, and the exhaust fan operates at the second target airflow within a preset second error range. This application, by setting two target airflow operating segments, adjusts the exhaust airflow through these two segments. It can operate at both the first and second target airflows under different back pressures. When the back pressure is low, the exhaust airflow is reduced, thereby reducing the energy consumption of the exhaust fan.

[0069] 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:

[0070] Step S71: 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.

[0071] Step S73: If the back pressure value is determined to be within the first back pressure range, the exhaust fan is controlled to enter the first target airflow operating segment to operate according to the first target airflow 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 first target airflow operating segment to operate according to the first target airflow 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 according to the first target airflow within a preset first error range.

[0072] Step S75: If the back pressure value is determined to be within the second back pressure range, the exhaust fan is controlled to enter the second target airflow operating segment to operate according to the second 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 second target airflow operating segment to operate according to the second target airflow within the preset second error range.

[0073] 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.

[0074] 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 7 At 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.

[0075] 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.

[0076] 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 a housing, an air duct disposed within the housing, and an exhaust fan 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 first target air volume operating segment corresponding to a first back pressure range and a second target air volume operating segment corresponding to a second back pressure range; Within the first target airflow operating range, the back pressure value detected by the range hood is within the first back pressure range, and the exhaust fan operates within the preset first error range according to the first target airflow. Within the second 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 second target airflow. The preset first error range is within ±15% of the first target air volume; the operating mode corresponding to the first target air volume operating segment includes 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 third error range according to the target air volume; the preset third error range is included in the preset first 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 first error range and the preset third 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 first error range and the preset third error range.

2. The range hood according to claim 1, characterized in that, The maximum value of the first back pressure range is less than the minimum value of the second back pressure range; the first target air volume is less than the second target air volume.

3. The range hood according to claim 2, characterized in that, The first back pressure range is 1 Pa to 50 Pa; the second back pressure range is 50 Pa to 300 Pa; the first target air volume is 30% to 60% of the rated air volume of the exhaust fan.

4. The range hood according to claim 1, characterized in that, The range hood includes two or more operating speeds; Each of the aforementioned operating levels corresponds to a different first target air volume and a different second target air volume; Within the first target air volume operating segment, the range hood switches from the current operating level to the next operating level, and the exhaust fan switches from the first target air volume corresponding to the current operating level to operating according to the first target air volume corresponding to the next operating level; Within the second target airflow operating segment, the range hood switches from the current operating level to the next operating level, and the exhaust fan switches from the second target airflow corresponding to the current operating level to operating according to the second target airflow corresponding to the next operating level.

5. The range hood according to claim 1, characterized in that, The preset second error range is within ±15% of the second target air volume; the operating mode corresponding to the second 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.

6. The range hood according to any one of claims 1 to 5, characterized in that, During the operation of the range hood, the working process of the exhaust fan includes a target power operating segment corresponding to the third back pressure range; Within the target power operating range, the back pressure value detected by the range hood is within the third back pressure range, and the exhaust fan operates at the target power within the preset fifth error range.

7. The range hood according to claim 6, characterized in that, The minimum value of the third back pressure range is between 300 Pa and 450 Pa.

8. The range hood according to claim 6, characterized in that, The preset fifth error range is 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; The constant power mode refers to the exhaust fan operating at the target power within a preset sixth error range; the preset sixth error range is included in the preset fifth 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 fifth error range and the preset sixth 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 fifth error range and the preset sixth error range.

9. A control method for a range hood, applied to a range hood, the range hood comprising a housing, an air duct disposed within the housing, and an exhaust fan disposed within the air duct, characterized in that... Includes the following steps: Obtain the back pressure value of the range hood; If the back pressure value is determined to be within the first back pressure range, the exhaust fan is controlled to enter the first target air volume operation segment so as to operate within the preset first error range according to the first target air volume; If the back pressure value is determined to be within the second back pressure range, the exhaust fan is controlled to enter the second target air volume operation segment so as to operate within the preset second error range according to the second target air volume; The preset first error range is within ±15% of the first target air volume; the operating mode corresponding to the first target air volume operating segment includes 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 third error range according to the target air volume; the preset third error range is included in the preset first 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 first error range and the preset third 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 first error range and the preset third error range.

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