Range hood

Abstract

This application relates to a range hood. The range hood includes a current signal acquisition unit and a controller. An instruction acquisition module acquires operating instructions and transmits them to a calculation module; the calculation module parses the operating instructions, acquires target operating parameters, and transmits these parameters to a control module; the control module controls the exhaust fan based on the target operating parameters; the current signal acquisition unit collects current signals during the operation of the exhaust fan and transmits them to a feedback module; the feedback module calculates the actual operating parameters of the exhaust fan based on the current signals and transmits these parameters to the calculation module; the calculation module calculates a correction value based on the actual and target operating parameters and transmits the correction value to the control module; the control module corrects the operating parameters of the exhaust fan based on the correction value. This allows for real-time correction of the exhaust fan's operating status, thereby improving the operational stability of the exhaust fan.

Description

Technical Field

[0001] This application relates to the field of range hood technology, and in particular to a 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, traditional range hoods can experience operational instability. Summary of the Invention

[0003] Therefore, it is necessary to provide a range hood that can improve operational stability in response to the aforementioned technical problems.

[0004] A range hood includes a controller, an air intake, an air duct, and an exhaust fan; the air intake is connected to the air duct; the exhaust fan is installed in the air duct, the controller is connected to the exhaust fan, and the range hood also includes a current signal acquisition device.

[0005] The controller includes an instruction acquisition module, a calculation module, a control module, and a feedback module; the instruction acquisition module is connected to the calculation module; the calculation module is connected to the control module; the control module is connected to the smoke exhaust fan; the current signal acquisition unit is connected to both the smoke exhaust fan and the feedback module; the feedback module is connected to the calculation module.

[0006] The instruction acquisition module acquires the execution instruction and transmits it to the computing module.

[0007] The calculation module parses the execution instructions, obtains the target execution parameters, and transmits the target execution parameters to the control module;

[0008] The control module controls the operation of the smoke exhaust fan based on the target operating parameters;

[0009] The current signal acquisition device collects the current signal during the operation of the smoke exhaust fan and transmits the current signal to the feedback module;

[0010] The feedback module calculates the actual operating parameters of the exhaust fan based on the current signal and transmits the actual operating parameters to the calculation module.

[0011] The calculation module calculates the correction value based on the actual operating parameters and the target operating parameters, and then transmits the correction value to the control module.

[0012] The control module adjusts the operating parameters of the exhaust fan based on the correction value.

[0013] In one embodiment, if the run instruction carries a target power, then the target run parameter is the target power;

[0014] Based on the target power, the control module controls the exhaust fan to enter the target power operating range;

[0015] If the execution command carries a target air volume, then the target execution parameter is the target air volume;

[0016] Based on the target air volume, the control module controls the exhaust fan to enter the target air volume operating segment.

[0017] In one embodiment, the feedback module includes a power feedback unit;

[0018] During the target power operation segment, the actual operating parameter is the actual power. The power feedback unit calculates the actual power of the exhaust fan based on the current signal and transmits the actual power to the calculation module.

[0019] The calculation module calculates the power correction value based on the actual power and the target power, and then transmits the power correction value to the control module.

[0020] The control module corrects the actual power of the exhaust fan based on the power correction value.

[0021] In one embodiment, the feedback module further includes a speed feedback unit;

[0022] In the target air volume operation segment, the actual operating parameter is the actual speed. The power feedback unit calculates the actual speed of the exhaust fan based on the current signal and transmits the actual speed to the calculation module.

[0023] The calculation module calculates the speed correction value based on the actual speed and the target air volume, and then transmits the speed correction value to the control module.

[0024] The control module corrects the actual speed of the exhaust fan based on the speed correction value.

[0025] In one embodiment,

[0026] 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 first error range;

[0027] 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 according to the target airflow within the preset second error range.

[0028] In one embodiment, the minimum value of the first back pressure range is equal to the maximum value of the second back pressure range; the minimum value of the first back pressure range is between 150 Pa and 450 Pa.

[0029] In one embodiment, the range hood includes two or more operating settings;

[0030] Each operating setting corresponds to a different target power; and each operating setting corresponds to a different target airflow.

[0031] Within the target power operating range, the range hood switches from the current operating level to the next operating level, and the exhaust fan switches from the target power corresponding to the current operating level to the target power corresponding to the next operating level.

[0032] Within the target air volume operating range, the range hood switches from the current operating level to the next operating level, and the exhaust fan switches from the target air volume corresponding to the current operating level to the target air volume corresponding to the next operating level.

[0033] In one embodiment, the first error range is preset to be between ±8% of the target power; the operating mode corresponding to the target power operating segment is one or any combination of constant power mode, underpower mode and overpower mode;

[0034] Among them, the constant power mode is that the exhaust fan operates at the target power within the preset third error range; the preset third error range is included in the preset first error range;

[0035] The rate of change of the back pressure-air volume curve corresponding to the underpower mode is less than the rate of change of the back pressure-air volume curve corresponding to the constant power mode; in the underpower mode, the error of the actual operating power of the exhaust fan relative to the target power is the negative difference set between the preset first error range and the preset third error range;

[0036] The rate of change of the back pressure-airflow curve corresponding to the overpower mode is greater than the rate of change of the back pressure-airflow curve corresponding to the constant power mode; in the overpower mode, the error of the actual operating power of the exhaust fan relative to the target power is the positive difference between the preset first error range and the preset third error range.

[0037] In one embodiment, the second back pressure range is between 1 Pa and 300 Pa; the preset second error range is between ±15% of the target air volume; the operating mode corresponding to the target air volume operating segment is one or any combination of constant air volume mode, intermediate extreme value mode and oscillation mode.

[0038] 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;

[0039] In the intermediate extreme mode, the actual output air volume of the smoke exhaust fan deviates in the direction of being greater than or less than the target air volume; in the intermediate extreme mode, the error of the actual output air volume of the smoke exhaust fan relative to the target air volume is the difference between the preset second error range and the preset fourth error range;

[0040] 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.

[0041] 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.

[0042] One of the above technical solutions has the following advantages and beneficial effects:

[0043] The fume extractor 105 provided in the embodiments of this application includes an instruction acquisition module, a calculation module, a control module, and a feedback module. The instruction acquisition module is connected to the calculation module; the calculation module is connected to the control module; the control module is connected to the exhaust fan; a current signal acquisition device is connected to both the exhaust fan and the feedback module; and the feedback module is connected to the calculation module. The current signal acquisition device acquires the current signal during the operation of the exhaust fan and transmits it to the feedback module. Based on the current signal, the feedback module calculates the actual operating parameters of the exhaust fan and transmits these parameters to the calculation module. Based on the actual operating parameters and target operating parameters, the calculation module calculates a correction value and transmits it to the control module. The control module corrects the operating parameters of the exhaust fan based on the correction value. By monitoring the operating status of the exhaust fan in real time and making real-time corrections, the operational stability of the exhaust fan is improved. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the range hood in the embodiments of this application.

[0045] Figure 2 This is a schematic diagram of the controller structure in an embodiment of this application.

[0046] Figure 3 This is a schematic diagram of the operation process of the range hood in the embodiments of this application.

[0047] Figure 4This is a schematic diagram of the operating mode of the range hood in the target power operating segment in the embodiments of this application.

[0048] Figure 5 This is a schematic diagram of the operating mode of the target air volume operating segment of the range hood in the embodiments of this application.

[0049] Figure 6 This is a schematic diagram of the operating mode of the target air volume operating segment of the range hood in the embodiments of this application.

[0050] Figure 7 This is a flowchart illustrating the control method of the range hood in an embodiment of this application. Detailed Implementation

[0051] 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.

[0052] 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.

[0053] To solve the above-mentioned technical problems, this application provides a range hood 100. For example... Figure 1 As shown, the range hood 100 includes an air intake 101, an air duct 103, a controller 105, and an exhaust fan 107. The air intake 101 is connected to the air duct 103, and the range hood 100 draws in cooking fumes through the air intake 101 and exhausts the fumes into the air duct 103. The air duct 103 is connected to the outside environment or the main air duct 103 of the building, thereby exhausting the cooking fumes from the building. It should be noted that the air intake 101 of the range hood 100 of this application is flat and elongated, with a small diameter. Under the same airflow speed provided by the exhaust fan 107, the negative pressure generated at the air intake 101 of the range hood 100 of this application is greater than that generated at an air intake 101 with a larger diameter, thus facilitating the extraction of cooking fumes.

[0054] An exhaust fan 107 is disposed within the duct 103. When the exhaust fan 107 operates, it drives the air in the duct 103 to flow outward, thereby providing suction power for the range hood 100 to extract cooking fumes. 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 107 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.

[0055] like Figure 2 As shown, the range hood 100 also includes a current signal acquisition unit 109. The controller 105 includes an instruction acquisition module 1051, a calculation module 1053, a control module 1055, and a feedback module 1057. The instruction acquisition module 1051 is connected to the calculation module 1053, the calculation module 1053 is connected to the control module 1055, the control module 1055 is connected to the exhaust fan 107, the current signal acquisition unit 109 is connected to both the exhaust fan 107 and the feedback module 1057, and the feedback module 1057 is connected to the calculation module 1053.

[0056] During the operation of the range hood, the instruction acquisition module 1051 acquires the operating instruction and transmits it to the calculation module 1053. The calculation module 1053 parses the operating instruction, acquires the target operating parameters, and transmits them to the control module 1055. Based on the target operating parameters, the control module 1055 controls the exhaust fan 107 to operate. The current signal acquisition device 109 acquires the current signal during the operation of the exhaust fan 107 and transmits it to the feedback module 1057. Based on the current signal, the feedback module 1057 calculates the actual operating parameters of the exhaust fan 107 and transmits them to the calculation module 1053. Based on the actual operating parameters and the target operating parameters, the calculation module 1053 calculates a correction value and transmits it to the control module 1055. Based on the correction value, the control module 1055 corrects the operating parameters of the exhaust fan 107. The control module 1055 performs initial control of the exhaust fan 107 based on the target operating parameters. During the operation of the exhaust fan 107, the current signal acquisition device 109 collects the actual operating parameters of the exhaust fan 107 and sends them to the feedback module 1057. The feedback module 1057 calculates a correction value based on the actual operating parameters and the target operating parameters and sends the correction value to the control module 1055. The control module 1055 corrects the operation of the exhaust fan 107 based on the correction value to ensure stable operation of the exhaust fan 107. It should be noted that the command acquisition module 1051 can acquire commands from the user through the command input device of the range hood or from the controller 105.

[0057] In one example, if the operation command carries a target power, then the target operating parameter is the target power. The control module 1055 controls the exhaust fan 107 to enter the target power operating segment based on the target power. In this example, the feedback module 1057 includes a power feedback unit. In the target power operating segment, the actual operating parameter is the actual power. The power feedback unit calculates the actual power of the exhaust fan 107 based on the current signal and transmits the actual power to the calculation module 1053. The calculation module 1053 calculates a power correction value based on the actual power and the target power and transmits the power correction value to the control module 1055. The control module 1055 corrects the actual power of the exhaust fan 107 based on the power correction value.

[0058] In one example, if the operation command carries a target air volume, then the target operating parameter is the target air volume. The control module 1055 controls the exhaust fan 107 to enter the target air volume operating segment based on the target air volume. In this example, the feedback module 1057 also includes a speed feedback unit; in the target air volume operating segment, the actual operating parameter is the actual speed. The power feedback unit calculates the actual speed of the exhaust fan 107 based on the current signal and transmits the actual speed to the calculation module 1053; the calculation module 1053 calculates a speed correction value based on the actual speed and the target air volume and transmits the speed correction value to the control module 1055; the control module 1055 corrects the actual speed of the exhaust fan 107 based on the speed correction value.

[0059] The fume extractor 105 provided in the embodiments of this application includes an instruction acquisition module, a calculation module, a control module, and a feedback module. The instruction acquisition module is connected to the calculation module; the calculation module is connected to the control module; the control module is connected to the exhaust fan; a current signal acquisition device is connected to both the exhaust fan and the feedback module; and the feedback module is connected to the calculation module. The current signal acquisition device acquires the current signal during the operation of the exhaust fan and transmits it to the feedback module. Based on the current signal, the feedback module calculates the actual operating parameters of the exhaust fan and transmits these parameters to the calculation module. Based on the actual operating parameters and target operating parameters, the calculation module calculates a correction value and transmits it to the control module. The control module corrects the operating parameters of the exhaust fan based on the correction value. By monitoring the operating status of the exhaust fan in real time and making real-time corrections, the operational stability of the exhaust fan is improved.

[0060] like Figure 3As shown, this application distinguishes between the target power operating segment and the target airflow operating segment based on back pressure value. Specifically, when the back pressure value of the range hood 100 is within a first back pressure range, the exhaust fan 107 of the range hood 100 enters the target power operating segment; when the back pressure value of the range hood 100 is within a second back pressure range, the exhaust fan 107 of the range hood 100 enters the target airflow operating segment. To implement this scheme, the range hood 100 includes a back pressure detection device and a controller 105. 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 controller 105. The controller 105 controls whether the exhaust fan 107 enters the target power operating segment or the target airflow operating segment based on the back pressure value. It should be noted that, in order to ensure that the airflow in the duct 103 is first driven by the target power operating segment to reduce the back pressure of the range hood 100, the back pressure value within the first back pressure range is greater than the back pressure value within the second back pressure range. In one example, the back pressure detection device is a back pressure sensor. In another example, the controller 105 is a control motherboard, MCU (Microcontroller Unit), or microcontroller, etc.

[0061] The target power operating range refers to the exhaust fan 107 operating at a power close to or equal to the target power. Specifically, when the range hood 100 is in the target power operating range, the back pressure value detected by the range hood 100 is within a first back pressure range, and the exhaust fan 107 operates at the target power within a preset first error range. In one example, the minimum value of the first back pressure range is between 150 Pa and 450 Pa, for example, the minimum value of the first back pressure range is 200 Pa, 250 Pa, 300 Pa, 350 Pa, or 400 Pa. The maximum value of the first back pressure range can be the actual back pressure value of the range hood 100 when it is stopped, as measured by the back pressure detection device. The preset first error range is used to limit the actual operating power range of the exhaust fan 107 in the target power operating range. In one example, the preset first error range is within ±8% of the target power, that is, the actual operating power range of the exhaust fan 107 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 107 during the target power operation range is between 32.2W and 37.8W, with a target power of 35W. For example, if the target power is 35W, then the actual operating power of the exhaust fan 107 during the target power operation range is between 32.2W and 37.8W. It is understood that the preset first error range of ±8% of the target power is for illustrative purposes only, and the preset first error range can be set according to actual needs; no specific limitation is made here.

[0062] To ensure that the exhaust fan 107 operates at the target power within a preset first error range, the controller 105 of the range hood 100 controls the actual output airflow of the exhaust fan 107 based on the detected back pressure value during the target power operation segment. This ensures that the exhaust fan 107 operates at the target power within the preset first error range. It should be noted that the range hood 100 can detect its back pressure value through a back pressure detection device and transmit the detected back pressure value to the controller 105. During the target power operation segment, different back pressure values ​​correspond to different actual output airflows, i.e., different rotational speeds of the exhaust fan 107. The controller 105 controls the rotational speed of the exhaust fan 107 based on the acquired back pressure value, thereby controlling the actual output airflow of the exhaust fan 107 to maintain its operation at the target power within the preset first error range.

[0063] During the target power operation range, in order to maintain the exhaust fan 107 operating at the target power within a preset first error range, such as... Figure 4 As shown, the operating mode corresponding to the target power operating segment is one or any combination of constant power mode, underpower mode, and overpower mode. In one example, the operating mode corresponding to the target power operating segment is constant power mode; in another example, the operating mode corresponding to the target power operating segment is underpower mode; in yet another example, the operating mode corresponding to the target power operating segment is overpower mode; in one example, the operating mode corresponding to the target power operating segment is a combination of constant power mode and underpower mode; in another example, the operating mode corresponding to the target power operating segment is a combination of underpower mode and overpower mode; in yet another example, the operating mode corresponding to the target power operating segment is a combination of constant power mode, underpower mode, and overpower mode.

[0064] It should be noted that constant power mode refers to the expectation that the actual operating power of the exhaust fan 107 will reach the target power. Constant power mode means that the exhaust fan 107 operates at the target power within a preset third error range. The preset third error range is included within the preset first error range, indicating that the actual operating power of the exhaust fan 107 is more precise in constant power mode. For example, the preset third error range may be ±3% of the target power, ±0.5% of the target power, or zero.

[0065] The underpower mode refers to the operation of the exhaust fan 107 at a power level lower than the target power. In the underpower mode, the actual operating power of the exhaust fan 107 is less than that in the 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 degree to which airflow changes with back pressure, or vice versa. In the underpower mode, the error between the actual operating power of the exhaust fan 107 and the target power is the negative difference between a preset first error range and a preset third error range. It should be noted that the error between the actual operating power of the exhaust fan 107 and the target power refers to the difference between the actual operating power and the target power. Since the preset first error range includes the preset third error range, the difference between the preset first error range and the preset third error range yields a set containing negative values ​​and a set containing positive values. For example, if the first error range is ±8% of the target power, and the preset third error range is ±3% of the target power, then by taking the difference between the preset first error range and the preset third error range, we obtain a set containing negative values ​​from -8% to -3% of the target power, and a set containing positive values ​​from +3% to +8% of the target power. The negative value difference set is then the set of values ​​from -8% to -3% of the target power.

[0066] Overpower mode refers to the operation of the exhaust fan 107 at an actual operating power higher than the target power. In overpower mode, the actual operating power of the exhaust fan 107 is greater than that in constant power mode, resulting in a greater rate of change in the back pressure-airflow curve corresponding to overpower mode compared to the rate of change in the back pressure-airflow curve corresponding to constant power mode. The rate of change in the back pressure-airflow curve refers to the degree to which airflow changes with back pressure, or the degree to which back pressure changes with airflow. In overpower mode, the error between the actual operating power of the exhaust fan 107 and the target power is the positive difference between a preset first error range and a preset third error range. It should be noted that the error between the actual operating power of the exhaust fan 107 and the target power refers to the difference between the actual operating power and the target power. Since the preset first error range includes the preset third error range, the difference between the preset first error range and the preset third error range yields a set containing negative values ​​and a set containing positive values. For example, if the first error range is ±8% of the target power, and the preset third error range is ±0.5% of the target power, then by taking the difference between the preset first error range and the preset third error range, we obtain a set containing negative values ​​from -8% to -0.5% of the target power, and a set containing positive values ​​from +0.5% to +8% of the target power. The difference set of positive values ​​is then the set of positive values ​​from +0.5% to +8% of the target power.

[0067] The target airflow operating range refers to the exhaust fan 107 operating at a speed close to or equal to the target airflow. Specifically, when the range hood 100 is in the target airflow operating range, the back pressure value detected by the range hood 100 is within the second back pressure range, and the exhaust fan 107 operates at the target airflow within a preset second error range. In one example, the second back pressure range is between 1 Pa and 300 Pa. In another example, the second back pressure range can also be between 1 Pa and 250 Pa, or between 1 Pa and 200 Pa. The preset second error range is used to limit the actual operating airflow range of the exhaust fan 107 in the target airflow operating range. In one example, the preset second error range is within ±15% of the target airflow, that is, the actual operating airflow range of the exhaust fan 107 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 107 within the target airflow range is between ±15%. For example, if the target airflow is 11 cubic meters per minute, then the actual operating power of the exhaust fan 107 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, then the actual operating power of the exhaust fan 107 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, then the actual operating power of the exhaust fan 107 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 second error range of ±15% of the target airflow is for illustrative purposes only, and the preset second error range can be set according to actual needs, without specific limitations here.

[0068] To ensure that the exhaust fan 107 operates at the target airflow within a preset second error range, during the target airflow operation segment, the controller 105, detected by the range hood 100, controls the input power of the exhaust fan 107 based on the detected back pressure value, thereby ensuring that the exhaust fan 107 operates at the target airflow within the preset second error range. It should be noted that the range hood 100 can detect its back pressure value through a back pressure detection device and transmit the detected back pressure value to the controller 105. Specifically, during the target airflow operation segment, different back pressure values ​​correspond to different input power values, i.e., different rotational speeds of the exhaust fan 107. The controller 105 controls the input power of the exhaust fan 107 based on the acquired back pressure value, thereby controlling the rotational speed of the exhaust fan 107 to maintain its operation at the target airflow within the preset second error range.

[0069] In the target airflow operation segment, to maintain the exhaust fan 107 operating at the target power within the preset second error range, the corresponding operating modes for the target airflow operation segment are constant airflow mode and intermediate extreme value mode (e.g., ...). Figure 5 (as shown) and oscillation modes (such as) Figure 6 (As shown) One or any combination of the following. In one example, the operating mode corresponding to the target airflow segment is constant airflow mode; in one example, the operating mode corresponding to the target airflow segment is intermediate extreme value mode; in one example, the operating mode corresponding to the target airflow segment is oscillation mode; in one example, the operating mode corresponding to the target airflow segment is a combination of oscillation mode and intermediate extreme value mode; in one example, the operating mode corresponding to the target airflow segment is a combination of intermediate extreme value mode and oscillation mode; in one example, the operating mode corresponding to the target airflow segment is a combination of constant airflow mode and oscillation mode; in one example, the operating mode corresponding to the target airflow segment is any combination of constant airflow mode, intermediate extreme value mode and oscillation mode.

[0070] 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 107 will reach the target air volume. In constant air volume mode, the smoke exhaust fan 107 operates within a preset fourth error range according to the 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 107 is more accurate in constant air volume mode. For example, the preset fourth error range may be ±5% of the target air volume, ±2% of the target power, or zero.

[0071] The intermediate extreme value mode refers to the operation of the smoke exhaust fan 107 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 107 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. It should be noted that in the intermediate extreme value mode, the error between the actual output air volume of the smoke exhaust fan 107 and the target air volume is the difference between a preset second error range and a preset fourth error range. Specifically, since the preset second error range includes the preset fourth error range, the difference between the 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 exhaust fan 107 deviates from the target airflow, the error between the actual output airflow of the exhaust fan 107 and the target airflow is a set of positive values ​​(i.e., a set containing positive values). When the actual output airflow of the exhaust fan 107 deviates from the target airflow, the error between the actual output airflow of the exhaust fan 107 and the target airflow is a set of negative values ​​(i.e., a set containing negative values). For example, if the preset second error range is ±15% of the target airflow and the fourth error range is ±2% of the target power, then the difference between the preset second error range and the preset fourth error range 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. When the actual output airflow of the exhaust fan 107 deviates from the target airflow, the error between the actual output airflow of the exhaust fan 107 and the target airflow is ±2% of the target airflow to +15% of the target power. When the actual output air volume of the exhaust fan 107 deviates from the target air volume, the error between the actual output air volume of the exhaust fan 107 and the target air volume is between -15% of the target air volume and -2% of the target power.

[0072] The oscillation mode refers to the actual output air volume of the exhaust fan 107 oscillating back and forth. In other words, under oscillation mode, the air volume output by the exhaust fan 107 oscillates between being less than and greater than the target air volume. It should be noted that, under oscillation mode, the error between the actual output air volume of the exhaust fan 107 and the target air volume is the difference between a preset second error range and a preset fourth error range. Specifically, since the preset second error range includes the preset fourth error range, the difference between the two sets yields a set containing negative values ​​and a set containing positive values. For example, the preset second error range might be ±15% of the target air volume, and the fourth error range might be ±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 target air volume and the set containing positive values ​​is obtained as +5% to +15% of the target air volume and the target power. The actual output air volume of the exhaust fan 107 corresponds to an error of -15% to -5% of the target air volume and the target power, and an error of +5% to +15% of the target air volume and the target power.

[0073] 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.

[0074] During gear switching, the current operating segment of the exhaust fan 107 is determined.

[0075] If, within the target power operating range, the range hood 100 switches from its current operating setting to the next, the exhaust fan 107 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 107 switches from operating at the target airflow corresponding to the current setting to operating at the target airflow corresponding to the next setting.

[0076] The range hood 100 provided in the embodiments of this application includes an air intake 101, an air duct 103, and an exhaust fan 107. The air intake 101 is connected to the air duct 103, and the exhaust fan 107 is disposed within the air duct 103. During the operation of the range hood 100, the operation of the exhaust fan 107 includes at least a target power operation segment corresponding to a first back pressure range and a target airflow operation segment corresponding to a second back pressure range. Specifically, within the target power operation segment, the back pressure value detected by the range hood 100 is within the first back pressure range, and the exhaust fan 107 operates at the target power within a preset first error range. Within the target airflow operation segment, the back pressure value detected by the range hood 100 is within the second back pressure range, and the exhaust fan 107 operates at the target airflow within a preset second error range. This application divides the smoke exhaust operation of the range hood 100 into a target power operation segment and a target air volume operation segment. The target power operation segment drives the airflow on the smoke output side of the range hood 100, reducing the back pressure of the range hood 100. When the back pressure of the range hood 100 drops to a certain value, it switches to the target air volume operation segment so that the exhaust fan 107 maintains operation at the target air volume. As the airflow flows, the lower the back pressure of the range hood 100, the lower the input power required to maintain operation at the target air volume. This achieves good airflow organization by utilizing the target power operation segment, improving the smoke extraction effect, and reduces power consumption by utilizing the target air volume operation segment.

[0077] 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 107; the air intake 101 is connected to the air duct 103; the exhaust fan 107 is disposed within the air duct 103, such as... Figure 7 As shown, it includes the following steps:

[0078] Step S71: Obtain the back pressure value of the range hood 100. The controller 105 of the range hood 100 obtains the back pressure value collected by the back pressure detection device of the range hood 100.

[0079] Step S73: If the back pressure value is determined to be within the first back pressure range, the exhaust fan 107 is controlled to enter the target power operating segment to operate at the target power within a preset first error range. If the controller 105 of the range hood 100 determines that the back pressure value is within the first back pressure range, it controls the exhaust fan 107 to enter the target power operating segment to operate at the target power within a preset first error range. In one example, the controller 105 of the range hood 100 controls the actual output airflow of the exhaust fan 107 based on the obtained back pressure value, so that the exhaust fan 107 operates at the target power within the preset first error range.

[0080] Step S75: If the back pressure value is determined to be within the second back pressure range, the exhaust fan 107 is controlled to enter the target airflow operating segment to operate according to the target airflow within the preset second error range. If the controller 105 of the range hood 100 determines that the back pressure value is within the second back pressure range, it controls the exhaust fan 107 to enter the target airflow operating segment to operate according to the target airflow within the preset second error range. In one example, the controller 105 of the range hood 100 controls the input power of the exhaust fan 107 based on the obtained back pressure value, so that the exhaust fan 107 operates according to the target airflow within the preset second error range. It should be noted that, in one embodiment, the minimum value of the first back pressure range is equal to the maximum value of the second back pressure range; the minimum value of the first back pressure range is between 150 Pa and 450 Pa; the preset first error range is between ±8% of the target power; the second back pressure range is between 1 Pa and 300 Pa; and the preset second error range is between ±15% of the target airflow.

[0081] 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.

[0082] It should be understood that, although Figure 6 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 in this document, there is no strict order in which these steps are executed, and they can be performed in other orders. Furthermore, Figure 6 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.

[0083] 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.

[0084] 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 controller, an air intake, an air duct, and an exhaust fan; the air intake is connected to the air duct; the exhaust fan is disposed within the air duct, and the controller is connected to the exhaust fan, characterized in that, The range hood also includes a current signal acquisition device; The controller includes an instruction acquisition module, a calculation module, a control module, and a feedback module; the instruction acquisition module is connected to the calculation module; the calculation module is connected to the control module; the control module is connected to the smoke exhaust fan; the current signal acquisition device is connected to both the smoke exhaust fan and the feedback module; the feedback module is connected to the calculation module. The instruction acquisition module acquires the execution instruction and transmits the execution instruction to the computing module. The computing module parses the running instruction, obtains the target running parameters, and transmits the target running parameters to the control module; The control module controls the operation of the smoke exhaust fan based on the target operating parameters; The current signal acquisition device acquires the current signal during the operation of the smoke exhaust fan and transmits the current signal to the feedback module; The feedback module calculates the actual operating parameters of the exhaust fan based on the current signal and transmits the actual operating parameters to the calculation module. The calculation module calculates a correction value based on the actual operating parameters and the target operating parameters, and transmits the correction value to the control module. The control module adjusts the operating parameters of the exhaust fan based on the correction value; Wherein, if the running instruction carries a target power, then the target running parameter is the target power; Based on the target power, the control module controls the exhaust fan to enter the target power operating range; If the operating instruction carries a target air volume, then the target operating parameter is the target air volume; Based on the target air volume, the control module controls the exhaust fan to enter the target air volume operating segment; 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 first error range; Within the target airflow operating range, the back pressure value detected by the range hood is within the second back pressure range, and the exhaust fan operates according to the target airflow within the preset second error range.

2. The range hood according to claim 1, characterized in that, The feedback module includes a power feedback unit; In the target power operation segment, the actual operating parameter is the actual power. The power feedback unit calculates the actual power of the exhaust fan based on the current signal and transmits the actual power to the calculation module. The calculation module calculates a power correction value based on the actual power and the target power, and transmits the power correction value to the control module; The control module corrects the actual power of the exhaust fan based on the power correction value.

3. The range hood according to claim 2, characterized in that, The feedback module also includes a speed feedback unit; In the target air volume operating segment, the actual operating parameter is the actual rotation speed. The power feedback unit calculates the actual rotation speed of the exhaust fan based on the current signal and transmits the actual rotation speed to the calculation module. The calculation module calculates the speed correction value based on the actual speed and the target air volume, and transmits the speed correction value to the control module; The control module corrects the actual rotational speed of the exhaust fan based on the rotational speed correction value.

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

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

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

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

8. The range hood according to claim 1, characterized in that, The range hood also includes an air collection box; the air collection box has a through groove for accommodating the air intake; the air velocity at the air intake is between 10 cubic meters per minute and 19 cubic meters per minute.

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