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 an air suction port, an air duct and a smoke exhaust fan. During operation of the range hood, the working process of the smoke exhaust fan at least comprises an intermediate target air volume operation section; the corresponding intermediate target air volume of the intermediate target air volume operation section is 50% to 85% of the rated air volume of the smoke exhaust fan; during the intermediate target air volume operation section, the back pressure value detected by the range hood is within the corresponding back pressure range of the intermediate target air volume operation section, and the smoke exhaust fan operates at the intermediate target air volume within a preset first error range. The application comprises the intermediate target air volume operation section in the operation process of the range hood, the intermediate target air volume operation section is inserted in the smoke exhaust process, the back pressure of the range hood can be quickly reduced, good air flow organization can be formed, the oil fume suction effect is improved, and the target air volume operation is beneficial to reducing power 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. Furthermore, the installation locations of range hoods vary. For example, some exhaust directly to the atmosphere, some are located high in the main duct, and some are low in the main duct. Therefore, facing such complex usage environments, the inventors discovered that traditional technologies have at least the following problems: traditional range hoods that simply increase exhaust volume cannot reduce energy consumption while maintaining good fume extraction performance. 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 a housing, within which are an air intake, an exhaust vent, a duct, and an exhaust fan. The air intake and exhaust vent are connected to the duct. The exhaust fan is located within the duct, and during operation, the exhaust fan's operation includes at least a target airflow section. The target airflow corresponding to this target airflow section is 50% to 85% of the exhaust fan's rated airflow.

[0005] Within the intermediate target airflow operating range, if the back pressure value detected by the range hood is within the corresponding back pressure range of the intermediate target airflow operating range, the exhaust fan will operate according to the intermediate target airflow within the preset first error range.

[0006] In one embodiment, the back pressure range corresponding to the intermediate target air volume operating segment is between 50 Pa and 800 Pa, and the intermediate target air volume is between 4 cubic meters per minute and 7 cubic meters per minute.

[0007] In one embodiment, the first error range is preset to be between ±15% of the intermediate target air volume; the working mode corresponding to the intermediate target air volume operating segment is one or any combination of constant air volume mode, intermediate extreme value mode and oscillation mode;

[0008] Among them, the constant air volume mode is that the smoke exhaust fan operates at the intermediate target air volume within the preset second error range; the preset second error range is included in the preset first error range;

[0009] In the intermediate extreme value mode, the actual output air volume of the smoke exhaust fan shifts to be greater than or less than the intermediate target air volume; in the intermediate extreme value mode, the error of the actual output air volume of the smoke exhaust fan relative to the intermediate target air volume is the difference between the preset first error range and the preset second error range;

[0010] In oscillation mode, the actual output air volume of the smoke exhaust fan oscillates between being less than and greater than the intermediate target air volume; in oscillation mode, the error of the actual output air volume of the smoke exhaust fan relative to the intermediate target air volume is the difference between the preset first error range and the preset second error range.

[0011] In one embodiment, the range hood includes two or more operating settings;

[0012] Each operating setting corresponds to a different intermediate target air volume;

[0013] Within the intermediate 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 intermediate target air volume corresponding to the current operating level to the intermediate target air volume corresponding to the next operating level.

[0014] In one embodiment, during the intermediate target airflow operation segment, the control device for detecting the range hood controls the input power of the exhaust fan based on the detected back pressure value, so that the exhaust fan operates within a preset second error range according to the target airflow.

[0015] In one embodiment, during the operation of the range hood, the working process of the exhaust fan further includes at least a target power operating segment corresponding to a first back pressure range and a target air volume operating segment corresponding to a second back pressure range; the minimum value of the first back pressure range is greater than the maximum value of the second back pressure range; the target power operating segment is between adjacent intermediate target air volume operating segments and target air volume operating segments; the first operating segment after the exhaust fan is started is the target power operating segment;

[0016] If there are two or more intermediate target air volume operating segments, then the area between adjacent intermediate target air volume operating segments is the target power operating segment;

[0017] Within the target power operating range, 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 third error range;

[0018] 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 fifth error range according to the target airflow.

[0019] In one embodiment, each preset third 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;

[0020] Among them, the constant power mode means that the exhaust fan operates at the target power within the preset fifth error range; the preset fifth error range is included in the preset third error range;

[0021] 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 third error range and the preset fifth error range;

[0022] 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 third error range and the preset fifth error range.

[0023] In one embodiment, the second back pressure range is between 1 Pa and 300 Pa; each preset fourth 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.

[0024] Among them, the constant air volume mode means that the smoke exhaust fan operates at the target air volume within the preset sixth error range; the preset sixth error range is included in the preset fourth error range;

[0025] 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 fourth error range and the preset sixth error range;

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

[0027] 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.

[0028] A control method for a range hood, applied to a range hood, the range hood including a housing, within which are disposed an air intake, an air exhaust, an air duct, and a smoke exhaust fan; the air intake and air exhaust are respectively connected to the air duct; the smoke exhaust fan is disposed within 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 back pressure range corresponding to the intermediate target air volume operating section, the exhaust fan is controlled to enter the intermediate target air volume operating section so as to operate according to the target air volume within the preset first error range; the intermediate target air volume corresponding to the intermediate target air volume operating section is 50% to 85% of the rated air volume of the exhaust fan.

[0031] One of the above technical solutions has the following advantages and beneficial effects:

[0032] The range hoods provided in the embodiments of this application include a housing, within which an air intake, an exhaust vent, a duct, and an exhaust fan are disposed. The air intake and exhaust vent are respectively connected to the duct. The exhaust fan is disposed within the duct. During the operation of the range hood, the exhaust fan's operation includes at least one intermediate target airflow operating segment. Within this intermediate target airflow operating segment, the back pressure value detected by the range hood is within the corresponding back pressure range, and the exhaust fan operates at the intermediate target airflow within a preset first error range. The intermediate target airflow corresponding to the intermediate target airflow operating segment is 50% to 85% of the exhaust fan's rated airflow. This application includes an intermediate target airflow operating segment in the range hood's exhaust process. By inserting this segment into the exhaust process, the back pressure of the range hood can be quickly reduced, and a good airflow organization can be formed, improving the smoke extraction effect. Simultaneously, operating at the target airflow helps reduce power consumption. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the range hood in the embodiments of this application.

[0034] Figure 2 This is a first schematic diagram of the operation process of the range hood in the embodiments of this application.

[0035] Figure 3 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.

[0036] Figure 4 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.

[0037] Figure 5 This is a second schematic diagram illustrating the operation of the range hood in an embodiment of this application.

[0038] Figure 6 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.

[0039] Figure 7 This is a flowchart illustrating the control method of the range hood in an embodiment of this application. Detailed Implementation

[0040] 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.

[0041] 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.

[0042] 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 107, within which are disposed an air intake 101, an exhaust 105, a duct 103, and an exhaust fan (not shown in the figure). The air intake 101 and exhaust 105 are connected to the duct 103. The range hood 100 draws in cooking fumes through the air intake 101 and exhausts them into the duct 103 through the exhaust 105. The duct 103 connects to the outside environment or the main duct 103 of the building, thereby venting the cooking fumes from the building. It should be noted that the air intake 101 of the range hood 100 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.

[0043] 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. During the operation of the range hood 100, the exhaust fan's operation includes a target power operation segment and a target air volume operation segment. It should be noted that the operation of the range hood 100 begins from the start of its fume extraction function until it stabilizes, that is, after the range hood 100 is turned on, the back pressure value of the range hood gradually decreases from the shutdown back pressure value to zero. The shutdown back pressure value is the back pressure value of the range hood in the shutdown state. The shutdown state can be a short time since the last start-up, when the airflow in the duct is not yet completely still; or it can be a long time since the last start-up, when the airflow in the duct is completely still. The shutdown back pressure value is the actual value measured by the range hood 100 in the shutdown state. In this application, "stable operation" means that the exhaust fan operates within the corresponding preset fifth error range according to the target air volume.

[0044] In one example, such as Figure 2 As shown, during the operation of a range hood, the exhaust fan's working process includes at least one intermediate target airflow operating segment. It should be noted that the intermediate target airflow operating segment is the exhaust segment set to operate at a target airflow when the range hood's back pressure value is within the middle range. This segment means the exhaust fan operates at a power level close to or equal to the intermediate target. The intermediate target airflow operating segment can have one, two, or three segments. In one example, the intermediate target airflow corresponding to the intermediate target airflow operating segment is 50% to 85% of the exhaust fan's rated airflow. For example, the intermediate target airflow is 55% of the exhaust fan's rated airflow, 60% of the rated airflow, 65% of the rated airflow, 70% of the rated airflow, and 75% of the rated airflow, etc. Here, the rated airflow is the maximum exhaust volume that the range hood can provide.

[0045] In one example, the back pressure range corresponding to the intermediate target airflow operating segment is between 50 Pa and 800 Pa, and the intermediate target airflow is between 4 cubic meters per minute and 7 cubic meters per minute. For example, one intermediate target airflow operating segment corresponds to a back pressure range of 50 Pa to 300 Pa, another to 400 Pa to 750 Pa, and yet another to 350 Pa to 800 Pa. These specific values ​​can be set according to actual needs. Additionally, the intermediate target airflow can be 5 cubic meters per minute or 6 cubic meters per minute.

[0046] Within the intermediate target airflow operating range, if the back pressure value detected by the range hood falls within the corresponding back pressure range for that range, the exhaust fan operates at the intermediate target airflow within a preset first error range. In one example, the preset first error range is within ±15% of the intermediate target airflow, meaning 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 actual operating power of the exhaust fan within the target airflow range is between ±15%. For example, if the target airflow is 4 cubic meters per minute, then the actual operating power range of the exhaust fan within the target airflow range is 3.4 cubic meters per minute to 4.6 cubic meters per minute. If the target airflow is 6 cubic meters per minute, then the actual operating power range of the exhaust fan within the target airflow range is 5.1 cubic meters per minute to 6.9 cubic meters per minute. If the target airflow is 7 cubic meters per minute, then the actual operating power range of the exhaust fan within the target airflow range is 5.95 cubic meters per minute to 8.05 cubic meters per minute. It is understood that the preset first error range of ±15% of the target airflow is for illustrative purposes only, and the preset first error range can be set according to actual needs; no specific limitation is made here.

[0047] The control process for the intermediate target air volume operating segment is as follows: within the intermediate target air volume operating segment, the control device for detecting the range hood controls the input power of the exhaust fan based on the detected back pressure value, so that the exhaust fan operates according to the target air volume within the preset second error range.

[0048] Range hoods can be designed with multiple operating speeds. In one example, a range hood may have two or more operating speeds. In this case, each operating speed corresponds to a different intermediate target airflow. Within the intermediate target airflow range, the range hood switches from the current operating speed to the next operating speed, and the exhaust fan switches from operating at the intermediate target airflow corresponding to the current operating speed to operating at the intermediate target airflow corresponding to the next operating speed.

[0049] In the intermediate target airflow operating range, in order to maintain the exhaust fan operating at the target power within the preset first error range, such as... Figure 3 and Figure 4As shown, the operating mode corresponding to the intermediate target airflow segment is one or any combination of constant airflow mode, intermediate extreme value mode, and oscillation mode. In one example, the operating mode corresponding to the target airflow segment is constant airflow mode; in another example, the operating mode corresponding to the target airflow segment is intermediate extreme value mode; in another example, the operating mode corresponding to the target airflow segment is oscillation mode; in another example, the operating mode corresponding to the target airflow segment is a combination of oscillation mode and intermediate extreme value mode; in another example, the operating mode corresponding to the target airflow segment is a combination of intermediate extreme value mode and oscillation mode; in another example, the operating mode corresponding to the target airflow segment is a combination of constant airflow mode and oscillation mode; in yet another example, the operating mode corresponding to the target airflow segment is any combination of constant airflow mode, intermediate extreme value mode, and oscillation mode.

[0050] 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 second error range, at an intermediate target air volume. This preset second error range is included within a preset first error range. This means that in constant air volume mode, the actual output air volume of the smoke exhaust fan is more precise. For example, the preset second error range could be ±4% of the target air volume, ±3% of the target power, or zero.

[0051] 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 this mode, the actual output air volume of the smoke exhaust fan shifts towards a direction greater than the target air volume; or it operates at an actual output air volume lower than the target air volume. In other words, in this mode, the actual output air volume of the smoke exhaust fan shifts towards either a direction greater than or less than the intermediate 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 intermediate target air volume is the difference between a preset first error range and a preset second error range. Specifically, since the preset first error range includes the preset second error range, the difference between the two sets yields a set containing negative values ​​and a set containing positive values. Therefore, when the actual output air volume of the smoke exhaust fan shifts towards a direction greater than 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 between the actual output airflow and the target airflow is a set of negative values ​​(i.e., a set containing negative values). For example, if the first preset error range is ±15% of the target airflow and the second preset error range is ±3% of the target power, then the difference between the first and second preset error ranges yields a set containing negative values ​​ranging from -15% of the target airflow to -3% of the target power, and a set containing positive values ​​ranging from +3% 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 between the actual output airflow and the target airflow is between +3% 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 between the actual output airflow and the target airflow is between -15% of the target airflow and -3% of the target power.

[0052] 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 actual output air volume of the smoke exhaust fan oscillates between being less than and greater than the intermediate 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 intermediate target air volume is the difference between a preset first error range and a preset second error range. Specifically, since the preset first error range includes a preset sixth error range, the difference between the preset second error range and the preset sixth error range yields a set containing negative values ​​and a set containing positive values. For example, if the preset first error range is ±15% of the target air volume and the second error range is ±4% of the target power, the difference between the preset first error range and the preset second error range yields a set containing negative values ​​ranging from -15% of the target air volume to -4% of the target power, and a set containing positive values ​​ranging from +4% 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 -4% of the target air volume and +4% to +15% of the target power.

[0053] In one example, such as Figure 5 As shown, during the operation of the range hood, the exhaust fan's working process also 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. The minimum value of the first back pressure range is greater than the maximum value of the second back pressure range; the period between adjacent intermediate target airflow operating segments is the target power operating segment; the first operating segment after the exhaust fan starts is the target power operating segment. In other words, from the moment the range hood is powered on until it reaches stable operation, the first segment is the target power operating segment, and the intermediate target airflow operating segments are not connected, with at least one target power operating segment inserted in between.

[0054] When there are two or more intermediate target airflow operating segments, the adjacent intermediate target airflow operating segments are connected to the target power operating segment. In other words, the intermediate target airflow operating segments are not connected, and a target power operating segment is inserted in between.

[0055] For example, the backpressure range from the shutdown backpressure value to zero should be divided into at least four backpressure subsets. It should be noted that adjacent backpressure subsets share a single value. For example, four, five, or six backpressure subsets can be divided; the specific number can be determined based on actual design requirements. A backpressure subset is a set of values ​​within the backpressure range from the shutdown backpressure value to zero.

[0056] Each back pressure subset satisfies the following conditions: at least two back pressure subsets correspond to the target power operating segment; at least two back pressure subsets correspond to the target component operating segment; the target power operating segments are not connected, the target component operating segments are not connected, and the segment with the smallest value in the back pressure subset corresponds to the target air volume operating segment.

[0057] For example, the back pressure range from the shutdown back pressure value to zero is sequentially divided into a first back pressure subset, a second back pressure subset, a third back pressure subset, and a fourth back pressure subset. To satisfy the above conditions, the first back pressure subset corresponds to the target power operating segment, the second back pressure subset corresponds to the target air volume operating segment, the third back pressure subset corresponds to the target power operating segment, and the fourth back pressure subset corresponds to the target air volume operating segment.

[0058] The back pressure range from the shutdown back pressure value to zero is sequentially divided into a first back pressure subset, a second back pressure subset, a third back pressure subset, a fourth back pressure subset, and a fifth back pressure subset. To satisfy the above conditions, the first back pressure subset corresponds to the target airflow operating segment, the second back pressure subset corresponds to the target power operating segment, the third back pressure subset corresponds to the target airflow operating segment, the fourth back pressure subset corresponds to the target power operating segment, and the fifth back pressure subset corresponds to the target airflow operating segment.

[0059] In the example where the back pressure range from the shutdown back pressure value to zero is sequentially divided into four back pressure subsets, the range is divided into four subsets with values ​​decreasing in descending order: a first subset, a second subset, a third subset, and a fourth subset. Specifically, the minimum value of the first subset is the maximum value of the second subset, the minimum value of the second subset is the maximum value of the third subset, and the minimum value of the third subset is the maximum value of the fourth subset. The first and third back pressure subsets correspond to the target power operating segment; the second and fourth back pressure subsets correspond to the target airflow operating segment. In one example, the target airflow for the target airflow operating segment corresponding to the second back pressure subset is between 4 cubic meters per minute and 7 cubic meters per minute. For example, the target airflow for the target airflow operating segment corresponding to the second back pressure subset is 5 cubic meters per minute or 6 cubic meters per minute.

[0060] In one example, the second back pressure subset is between 300 Pa and 700 Pa. For example, the second back pressure subset is 300 Pa to 700 Pa; the second back pressure subset is 350 Pa to 650 Pa; the second back pressure subset is 400 Pa to 600 Pa. In one example, the target airflow for the target airflow operating segment corresponding to the fourth back pressure subset is between 11 cubic meters per minute and 13 cubic meters per minute. For example, the target airflow for the target airflow operating segment corresponding to the fourth back pressure subset is 12 cubic meters per minute.

[0061] 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.

[0062] This application distinguishes between the target power operating segment and the target airflow operating segment by using back pressure values. Specifically, the back pressure range from the shutdown back pressure value to zero is divided into at least four back pressure subsets. At least two back pressure subsets correspond to the target power operating segment, and at least two back pressure subsets correspond to the target airflow operating segment. Specifically, within the target power operating segment, if the back pressure value detected by the range hood 100 falls within the corresponding back pressure subset, the exhaust fan operates at the target power within the corresponding preset third error range. Within the target airflow operating segment, if the back pressure value detected by the range hood falls within the corresponding back pressure subset, the exhaust fan operates at the target airflow within the preset fourth error range. To implement this solution, 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 one example, the back pressure detection device is a back pressure sensor. In another example, the control device is a control motherboard, MCU (Microcontroller Unit), or microcontroller, etc.

[0063] It should be noted that since there are at least two target power operating segments, the target power corresponding to each target power operating segment may be the same or different. In addition, the preset third error range corresponding to each target power operating segment may be the same or different. Therefore, when the exhaust fan operates at the target power within the corresponding preset third error range, "corresponding preset third error range" refers to the preset third error range corresponding to the target power operating segment.

[0064] Since there are at least two target air volume operating segments, and the target air volume corresponding to each target air volume operating segment is different, and the preset fourth error range corresponding to each target air volume operating segment can be the same or different, the "corresponding preset third error range" in the context of the smoke exhaust fan operating according to the target air volume within the corresponding preset fourth error range refers to the preset third error range corresponding to the target air volume operating segment.

[0065] 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 corresponding back pressure segment of that target power operating range, and the exhaust fan operates at the target power within a preset third error range. The preset third 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 third 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 (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 third error range of ±8% of the target power is for illustrative purposes only, and the preset third error range can be set according to actual needs, without specific limitations here.

[0066] To ensure the exhaust fan operates at the target power within a preset third 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 corresponding preset third 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 third error range.

[0067] During the target power operation range, in order to maintain the exhaust fan operating at the target power within the preset third 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.

[0068] 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 fifth error range. This preset fifth error range is included within the preset third error range, indicating that the actual operating power of the exhaust fan is more precise in constant power mode. For example, the preset fifth error range could be ±3% of the target power, ±0.5% of the target power, or zero.

[0069] 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 third error range and the preset fifth 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 third error range includes the preset fifth error range, the difference between the preset third and fifth 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 fifth error range is ±3% of the target power, then by taking the difference between the preset third error range and the preset fifth 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.

[0070] 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 third error range and the preset fifth 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 third error range includes the preset fifth error range, the difference between the preset third and fifth 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 fifth error range is ±0.5% of the target power, then by taking the difference between the preset third error range and the preset fifth 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.

[0071] The target airflow operating segment 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 segment, the back pressure value detected by the range hood 100 is within the corresponding back pressure sub-segment of the target airflow operating segment, and the exhaust fan operates according to the target airflow within a preset fourth error range. In one example, the minimum value segment in the back pressure subset is between 1 Pa and 300 Pa. In another example, the minimum value segment in the back pressure subset could also be between 1 Pa and 250 Pa, or between 1 Pa and 200 Pa. It should be noted that, since the back pressure range of the range hood 100 continuously varies from high to low, the range from the shutdown back pressure value to zero is divided, and the minimum value segment in the back pressure subset includes the value segment with zero back pressure.

[0072] The preset fourth error range is used to limit the actual operating air volume range of the smoke exhaust fan when it operates within the target air volume range. In one example, the preset fourth error range is within ±15% of the target air volume, that is, the actual operating air volume range of the smoke exhaust fan when it operates within the target air volume range is (target air volume - target air volume). 15% to (target air volume + target air volume) The actual operating power of the exhaust fan within the target airflow range is between ±15%. For example, if the target airflow is 11 cubic meters per minute, the actual operating power range of the exhaust fan within 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 range of the exhaust fan within 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 range of the exhaust fan within the target airflow range is 11.05 cubic meters per minute to 14.95 cubic meters per minute. It is understood that the preset fourth error range of ±15% of the target airflow is for illustrative purposes only, and the preset fourth error range can be set according to actual needs; no specific limitation is made here.

[0073] To ensure the exhaust fan operates at the target airflow within a preset fourth error range, the control device of the range hood 100, based on the detected back pressure value, controls the input power of the exhaust fan within the target airflow range during the target airflow operation segment. 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 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 and its speed based on the acquired back pressure value to maintain the exhaust fan operating at the target airflow within the preset fourth error range.

[0074] In the target airflow operation range, to maintain the exhaust fan operating at the target power within the preset fourth error range, the corresponding operating modes for the target airflow operation range 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 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.

[0075] 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 sixth error range according to the target air volume. This preset sixth error range is included within the preset fourth 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 sixth error range may be ±5% of the target air volume, ±2% of the target power, or zero.

[0076] 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 the preset fourth error range and the preset sixth error range. Specifically, since the preset fourth error range includes the preset sixth error range, the difference between the preset fourth and preset sixth error ranges 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 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 between the actual output airflow and the target airflow is a set of negative values ​​(i.e., a set containing negative values). For example, if the preset fourth error range is ±15% of the target airflow and ±2% of the target power, then the difference between the preset fourth and sixth 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 between the actual output airflow and 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 between the actual output airflow and the target airflow is between -15% of the target airflow and -2% of the target power.

[0077] 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 the preset fourth error range and the preset sixth error range. Specifically, since the preset fourth error range includes the preset sixth error range, the difference between the preset fourth and sixth error ranges yields a set containing negative values ​​and a set containing positive values. For example, if the preset fourth error range is ±15% of the target air volume and ±5% of the target power, the difference between the preset fourth and sixth error ranges yields a set containing negative values ​​from -15% to -5% of the target air volume and a set containing positive values ​​from +5% 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.

[0078] To accommodate different cooking processes or methods, in one example, the range hood 100 includes two or more operating levels. Each operating level corresponds to a different target power; and the same back pressure subset within each operating level corresponds to a different target airflow. It should be noted that the back pressure range is divided in the same way across all operating levels, and the same back pressure subset within each operating level refers to the subset of back pressure values ​​that are equal across all operating levels. For example, in one example, the range hood 100 includes three levels: low, medium, and high. The back pressure range from the off-state back pressure value to zero is sequentially divided into a first back pressure subset, a second back pressure subset, a third back pressure subset, and a fourth back pressure subset. The first back pressure subset corresponds to the target power operating segment, the second back pressure subset corresponds to the target airflow operating segment, the third back pressure subset corresponds to the target power operating segment, and the fourth back pressure subset corresponds to the target airflow operating segment. For example, in one example, the target power corresponding to the first and third back pressure subsets of the low-end setting is 35W, the target airflow corresponding to the second back pressure subset of the low-end setting is 4 cubic meters per minute, and the target airflow corresponding to the fourth back pressure subset of the low-end setting is 11 cubic meters per minute. The target power corresponding to the first and third back pressure subsets of the mid-end setting is 37W, the target airflow corresponding to the second back pressure subset of the mid-end setting is 4 cubic meters per minute, and the target airflow corresponding to the fourth back pressure subset of the mid-end setting is 11 cubic meters per minute. The target power corresponding to the first and third back pressure subsets of the high-end setting is 39W, the target airflow corresponding to the second back pressure subset of the high-end setting is 4 cubic meters per minute, and the target airflow corresponding to the fourth back pressure subset of the high-end setting is 11 cubic meters per minute.

[0079] During gear switching, the operation is adjusted according to the current operating stage of the exhaust fan.

[0080] 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.

[0081] The range hoods provided in the embodiments of this application include a housing, within which an air intake, an exhaust vent, a duct, and an exhaust fan are disposed. The air intake and exhaust vent are respectively connected to the duct. The exhaust fan is disposed within the duct. During the operation of the range hood, the exhaust fan's operation includes at least one intermediate target airflow operating segment. Within this intermediate target airflow operating segment, the back pressure value detected by the range hood is within the corresponding back pressure range, and the exhaust fan operates at the intermediate target airflow within a preset first error range. The intermediate target airflow corresponding to the intermediate target airflow operating segment is 50% to 85% of the exhaust fan's rated airflow. This application includes an intermediate target airflow operating segment in the range hood's exhaust process. By inserting this segment into the exhaust process, the back pressure of the range hood can be quickly reduced, and a good airflow organization can be formed, improving the smoke extraction effect. Simultaneously, operating at the target airflow helps reduce power consumption.

[0082] In one embodiment, this application also provides a control method for a range hood 100, applied to the range hood 100. The range hood 100 includes a housing 107, within which are disposed an air intake 101, an air exhaust 105, a duct 103, and a smoke exhaust fan; the air intake 101 and the air exhaust 105 are connected to the duct 103; the smoke exhaust fan is disposed within the duct 103, such as... Figure 7 As shown, it includes the following steps:

[0083] Step S71: Obtain the back pressure value of the range hood.

[0084] Step S73: If the back pressure value is determined to be within the back pressure range corresponding to the intermediate target air volume operating section, control the smoke exhaust fan to enter the intermediate target air volume operating section so as to operate according to the target air volume within the preset first error range; the intermediate target air volume corresponding to the intermediate target air volume operating section is 50% to 85% of the rated air volume of the smoke exhaust fan.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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, wherein an air intake, an air exhaust, a duct, and an exhaust fan are disposed within the housing; the air intake and the air exhaust are respectively connected to the duct; and the exhaust fan is disposed within the duct, characterized in that, During the operation of the range hood, the working process of the exhaust fan includes at least a section with an intermediate target air volume; the intermediate target air volume corresponding to the intermediate target air volume section is 50% to 85% of the rated air volume of the exhaust fan; Within the intermediate target airflow operating range, the back pressure value detected by the range hood is within the back pressure range corresponding to the intermediate target airflow operating range, and the exhaust fan operates according to the intermediate target airflow within a preset first error range.

2. The range hood according to claim 1, characterized in that, The back pressure range corresponding to the intermediate target air volume operating section is between 50 Pa and 800 Pa, and the intermediate target air volume is between 4 cubic meters per minute and 7 cubic meters per minute.

3. The range hood according to claim 1, characterized in that, The preset first error range is within ±15% of the intermediate target air volume; the working mode corresponding to the intermediate 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 second error range according to the intermediate target air volume; the preset second 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 intermediate target air volume; in the intermediate extreme mode, the error of the actual output air volume of the smoke exhaust fan relative to the intermediate target air volume is the difference between the preset first error range and the preset second error range; In the oscillation mode, the actual output air volume of the smoke exhaust fan oscillates between being less than the intermediate target air volume and being greater than the intermediate target air volume; in the oscillation mode, the error of the actual output air volume of the smoke exhaust fan corresponding to the intermediate target air volume is the difference between the preset first error range and the preset second error range.

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 speeds corresponds to a different intermediate target airflow. Within the intermediate 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 intermediate target airflow corresponding to the current operating level to operating according to the intermediate target airflow corresponding to the next operating level.

5. The range hood according to claim 1, characterized in that, Within the intermediate target airflow operating range, the control device for detecting the range hood controls the input power of the exhaust fan based on the detected back pressure value, so that the exhaust fan operates within a preset second error range according to the target airflow.

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 further includes at least a target power operating segment corresponding to a first back pressure range and a target air volume operating segment corresponding to a second back pressure range; the minimum value of the first back pressure range is greater than the maximum value of the second back pressure range; the target power operating segment is between adjacent intermediate target air volume operating segments and the target air volume operating segments; the first operating segment after the exhaust fan starts is the target power operating segment; If there are two or more intermediate target airflow operating segments, then the target power operating segment is located between adjacent intermediate target airflow operating segments. Within the target power operating range, 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 third error range; Within the target airflow operating range, if the back pressure value detected by the range hood is within the second back pressure range, the exhaust fan will operate within the preset fourth error range according to the target airflow.

7. The range hood according to claim 6, characterized in that, Each of the preset third error ranges 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 fifth error range; the preset fourth error range is included in the preset third 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 difference set between the preset third error range and the preset fifth 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 third error range and the preset fifth error range.

8. The range hood according to claim 6, characterized in that, The second back pressure range is between 1 Pa and 300 Pa; each of the preset fourth error ranges is within ±15% of the target air volume; the working 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 exhaust fan operating within a preset sixth error range according to the target air volume; the preset sixth error range is included in the preset fourth 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 fourth error range and the preset sixth 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 fourth error range and the preset sixth error range.

9. The range hood according to any one of claims 1 to 4, 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.

10. A control method for a range hood, applied to a range hood, the range hood comprising a housing, wherein an air intake, an air exhaust, a duct, and an exhaust fan are disposed within the housing; the air intake and the air exhaust are respectively connected to the duct; the exhaust fan is disposed within the 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 back pressure range corresponding to the intermediate target air volume operating segment, the exhaust fan is controlled to enter the intermediate target air volume operating segment so as to operate according to the target air volume within the preset first error range; the intermediate target air volume corresponding to the intermediate target air volume operating segment is 50% to 85% of the rated air volume of the exhaust fan.

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