Range hood control methods and range hoods

Abstract

This invention relates to the field of range hood technology, specifically providing a control method and a range hood that at least solves the problems of low smoke extraction efficiency and low energy efficiency in existing range hoods. The range hood provided by this invention includes a fan, and the control method includes: acquiring the real-time rotational speed of the fan and the real-time airflow of the range hood; calculating the outlet static pressure of the range hood based on the real-time rotational speed, real-time airflow, and a preset static pressure-airflow relationship model; calculating the external impedance of the range hood based on the real-time airflow and outlet static pressure; comparing the external impedance with a preset impedance threshold, and selectively adjusting the height of the range hood according to the comparison result. This invention adjusts the height of the range hood, which can further optimize the smoke extraction path and reduce the resistance encountered during the smoke extraction process.

Description

Technical Field

[0001] This invention relates to the field of range hood technology, specifically providing a control method for a range hood and a range hood itself. Background Technology

[0002] As range hoods become increasingly common in daily cooking, consumers are paying more and more attention to their smoke extraction efficiency and energy consumption. Most existing range hoods are fixedly installed, but when the distance between the range hood's inlet and the countertop is too large, the longer smoke path increases the extraction time. This not only reduces the range hood's smoke extraction efficiency but also easily leads to smoke dispersion, directly impacting the user experience.

[0003] Therefore, a new control method is urgently needed to solve the above problems. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned technical problems, namely, to at least solve the problems of low smoke extraction efficiency and low energy efficiency of existing range hoods.

[0005] In a first aspect, the present invention provides a control method for a range hood, the range hood including a fan, the control method comprising: acquiring the real-time rotational speed of the fan and the real-time airflow of the range hood; calculating the outlet static pressure of the range hood based on the real-time rotational speed, the real-time airflow, and a preset static pressure-airflow relationship model; calculating the external impedance of the range hood based on the real-time airflow and the outlet static pressure; comparing the external impedance with a preset impedance threshold, and selectively adjusting the height of the range hood according to the comparison result.

[0006] This invention monitors the external impedance of the range hood and adjusts its height based on a comparison between the external impedance and a preset impedance threshold. This adjusts the distance between the smoke inlet and the countertop, thereby optimizing the smoke exhaust path and reducing resistance during the exhaust process. This effectively lowers the external impedance of the range hood, which not only improves its smoke extraction efficiency and reduces smoke escape, but also reduces noise and energy consumption during operation, enhancing the user experience.

[0007] In some feasible implementations of the above-mentioned range hood control method, the phrase "selectively adjusting the height of the range hood based on the comparison results" includes:

[0008] If the external impedance is less than or equal to the preset impedance threshold, the height of the range hood will not be adjusted; or

[0009] If the external impedance is greater than or equal to or greater than the preset impedance threshold, then the height of the range hood is reduced.

[0010] Understandably, when the external impedance is less than or equal to the preset impedance threshold, it indicates that the current height of the range hood is sufficient to effectively remove cooking fumes, and no height adjustment is needed to achieve efficient fume extraction. When the external impedance is greater than or equal to the preset impedance threshold, it indicates that the fume path is too long, and the distance between the suction inlet and the countertop is too far. In this case, lowering the height of the range hood reduces the distance between the suction inlet and the countertop, thereby reducing the external impedance and improving the fume extraction efficiency. Furthermore, when the external impedance of the range hood decreases, the power required by the range hood also decreases, thus achieving energy saving and noise reduction.

[0011] In some feasible implementations of the above-mentioned range hood control method, the "selective adjustment of the height of the range hood" includes: selecting the height adjustment amount of the range hood based on a preset air volume-height relationship, and adjusting the height of the range hood with the height adjustment amount.

[0012] Understandably, based on the airflow-height relationship determined during the experiment, the adjustment range of the range hood height can be accurately obtained, ensuring that the range hood can effectively remove fumes with an optimal exhaust path under different cooking conditions, reducing the escape of fumes and improving the efficiency of fume extraction.

[0013] In some feasible embodiments of the above-mentioned range hood control method, the range hood includes a smoke collection hood, the smoke collection hood includes a smoke inlet, and the "selective adjustment of the height of the range hood" includes: selectively adjusting the height of the smoke inlet.

[0014] In some feasible embodiments of the above-mentioned control method for range hoods, before obtaining the real-time rotational speed of the fan and the real-time air volume of the range hood, the control method further includes: adjusting the height of the smoke inlet to a preset height.

[0015] In some feasible embodiments of the above-described range hood control method, before, simultaneously with, or after selectively adjusting the height of the range hood, the control method further includes: selectively adjusting the fan speed based on a comparison result.

[0016] In some feasible implementations of the above-mentioned range hood control method, the phrase "selectively adjusting the fan speed based on the comparison results" includes:

[0017] If the external impedance is less than or equal to the preset impedance threshold, the fan speed will not be adjusted; or

[0018] If the external impedance is greater than or equal to or greater than the preset impedance threshold, the speed of the fan is increased.

[0019] In some feasible implementations of the above-mentioned range hood control method, the formula for calculating the external impedance is:

[0020] S = P / Q 2

[0021] Where S is the external impedance of the range hood; P is the static pressure at the outlet of the range hood; and Q is the real-time airflow of the range hood.

[0022] In some feasible implementations of the above-mentioned range hood control method, the preset static pressure-airflow relationship model is a set of static pressure-airflow relationship curves corresponding to multiple fan speeds.

[0023] In a second aspect, the present invention also provides a range hood, the range hood including a control device, the control device including a memory and a processor, the memory storing a computer program, and the processor being configured to execute the control method of the range hood in any of the foregoing technical solutions through the computer program.

[0024] Those skilled in the art will understand that, since the range hood can execute the control method in any of the aforementioned technical solutions, it possesses all the technical effects that the aforementioned control method can achieve, and will not be elaborated further here. Attached Figure Description

[0025] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0026] Figure 1 This is a flowchart of the control method for a range hood provided in Embodiment 1 of the present invention;

[0027] Figure 2 A schematic diagram of the air volume-height relationship model of a range hood provided in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the static pressure-airflow relationship model of a range hood provided in an embodiment of the present invention. Detailed Implementation

[0029] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the invention and are not intended to limit the scope of protection of the invention. Those skilled in the art can make adjustments as needed to adapt to specific applications. Numerous specific details are set forth in the following detailed description to better illustrate the invention. Those skilled in the art should understand that the invention can be practiced even without certain specific details.

[0030] A range hood, also known as a cooking hood or range extractor, generally consists of a smoke collection hood and a drive mechanism, typically a fan. During operation, the range hood is powered on, starting the motor to drive the fan's impeller. Driven by the fan, the cooking fumes are drawn into the range hood's duct and then exhausted outdoors. The smoke collection hood includes the suction inlet. The range hood can be movably mounted on the wall, or the smoke collection hood can be movably mounted on the range hood. This allows adjustment of the distance between the suction inlet and the countertop by controlling the movement of either the range hood or the smoke collection hood.

[0031] Example 1

[0032] like Figure 1 As shown, Figure 1 This is a schematic flowchart of the main steps of a range hood control method provided by the present invention. The range hood control method provided by the present invention includes:

[0033] S1. Obtain the real-time speed of the fan and the real-time air volume of the range hood.

[0034] Specifically, the real-time rotational speed of the fan can be measured using a speed sensor or other means, and the real-time airflow of the range hood can be measured using an airflow sensor or other means.

[0035] S2. Based on real-time rotation speed, real-time air volume, and a preset static pressure-air volume relationship model, the outlet static pressure of the range hood (i.e., the static pressure of the range hood) is calculated.

[0036] See Figure 3 The preset static pressure-airflow relationship model is a collection of static pressure-airflow relationship curves (i.e., PQ relationship curves) corresponding to multiple fan speeds. The model covers static pressure-airflow relationship curves at multiple fan speeds, meaning that regardless of the speed of the range hood's fan, a corresponding static pressure-airflow relationship can be found, thus improving the model's accuracy and applicability. (Continue to refer to...) Figure 3 When the fan speed is fixed (i.e., the same speed is used), the real-time air volume is input into the corresponding static pressure-air volume relationship curve, and the outlet static pressure of the range hood can be output.

[0037] Additionally, a set of static pressure-airflow relationship curves corresponding to multiple external impedances can be added to the static pressure-airflow relationship model. This enriches the model's dataset, allowing it to more comprehensively reflect the performance of the range hood under different impedance conditions. This helps improve the model's accuracy and reliability, making its predictions and evaluations of range hood performance closer to reality. It should be noted that, as... Figure 3As shown in the figure, the external impedance S can be 2.2, 2.6 and 3.8, and the fan speed V can be 1100 rpm, 1200 rpm and 1300 rpm. Other values ​​are not shown in the figure.

[0038] It should be noted that when establishing the static pressure-airflow relationship model, different fan speeds can be selected for the range hood to conduct experimental tests, obtain multiple sets of data on the static pressure and airflow of the range hood at different fan speeds, and construct the static pressure-airflow relationship curve of the range hood at different fan speeds based on the above data.

[0039] In one specific implementation of the static pressure-airflow relationship model, the fan speed range is 400 rpm to 1500 rpm. During experimental testing, the fan speed can be taken as an integer, with intervals of 100 rpm. Multiple sets of static pressure and airflow data for the range hood at different fan speeds are obtained through actual measurements, and the static pressure-airflow characteristic curve of the range hood is plotted. Based on this, other intermediate speeds can be calculated by averaging the curves of two adjacent integer speeds, using the following formula:

[0040]

[0041] Where n, n1, and n2 are the fan speeds at a certain value, and speeds n1 and n2 are two consecutive integer speeds of speed n in the static pressure-air volume relationship model, with n2 being greater than n1. n (P) is the air volume of the range hood when the rotation speed is n and the outlet static pressure is P, and the unit is m³ / s. 3 / min, This refers to the airflow of the range hood when its rotation speed is n1 and its outlet static pressure is P. It is the air volume of the range hood when the rotation speed is n2 and the outlet static pressure is P.

[0042] It should be noted that the values ​​in the above examples are merely exemplary and should not be construed as limiting the scope of protection of this invention.

[0043] S3. Based on the real-time air volume and outlet static pressure, the external impedance of the range hood is calculated.

[0044] Specifically, the formula for calculating external impedance is:

[0045] S = P / Q 2

[0046] Where S is the external impedance of the range hood; P is the static pressure at the outlet of the range hood, in Pa; and Q is the real-time airflow of the range hood, in m³ / s. 3 / min.

[0047] S4. Compare the external impedance with the preset impedance threshold, and selectively adjust the height of the range hood based on the comparison result.

[0048] The preset impedance threshold was obtained experimentally during the experimental phase and recorded in the range hood's controller. The process of obtaining the preset impedance threshold during the experimental phase included: acquiring the real-time noise value of the range hood during operation, blocking the range hood's exhaust vent, and adjusting the range hood's back pressure until the real-time noise value reached the preset noise threshold. The external impedance of the range hood at this point was then calculated and used as the preset impedance threshold.

[0049] Understandably, by adjusting the back pressure and observing changes in real-time noise levels during the process of obtaining the preset impedance threshold, a balance between the performance and noise of the range hood can be found. When the real-time noise level reaches the preset noise threshold, the external impedance at this point serves as the preset impedance threshold, ensuring that the range hood has a certain smoke extraction capacity while also acting as a reasonable threshold for controlling the noise level of the range hood.

[0050] The preset noise threshold can be selected according to the actual situation. For example, the preset noise threshold can be 65dB. When the noise of the range hood reaches 65dB, the external impedance at this time is recorded as the preset impedance threshold. When the measured external impedance of the range hood is greater than the preset impedance threshold, the noise of the range hood is considered to be greater than 65dB.

[0051] Furthermore, based on the comparison between the external impedance and the preset impedance threshold, the height of the range hood can be selectively adjusted. In other words, the height of the range hood can be adjusted or not adjusted based on the comparison between the external impedance and the preset impedance threshold. Specifically, this includes:

[0052] S41. If the external impedance is less than or equal to the preset impedance threshold, the height of the range hood will not be adjusted.

[0053] When the external impedance is less than or equal to the preset impedance threshold, it means that the current height of the range hood is sufficient to effectively remove fumes. At this time, no height adjustment is needed to achieve the purpose of efficient smoke removal.

[0054] S42. If the external impedance is greater than or equal to or greater than the preset impedance threshold, the height of the range hood shall be reduced.

[0055] When the external impedance is greater than or equal to a preset impedance threshold, it indicates that the smoke extraction path is too long and the distance between the smoke extraction port and the countertop is too far. In this case, reducing the height of the range hood can decrease the distance between the smoke extraction port and the countertop, thereby reducing the external impedance and improving the range hood's smoke extraction efficiency. Furthermore, when the external impedance of the range hood decreases, the power required by the range hood also decreases, thus achieving energy saving and noise reduction.

[0056] Furthermore, based on the preset airflow-height relationship, the height adjustment amount of the range hood is selected, and the height of the range hood is adjusted accordingly. It is understandable that, based on the airflow-height relationship determined during the experiment, the range hood height adjustment amount can be accurately obtained, ensuring that the range hood can effectively remove fumes with an optimal exhaust path under different cooking conditions, reducing fume escape and improving fume extraction efficiency.

[0057] Specifically, please refer to Figure 2 Multiple sets of data on the relationship between the height of the range hood and the required airflow were obtained through experimental testing. Based on this data, a linear fitting function for the relationship between the range hood's height and required airflow can be derived. In other words, an airflow-height relationship model for the range hood can be constructed based on this data, and the adjustment height of the range hood can be selected based on this model. Specifically, when conducting tests to obtain the relevant data... Figure 2 The air volume Q is the air volume required for the range hood to achieve a 90% oil fume capture rate. Figure 2 The height in the figure refers to the distance between the range hood and the countertop. It's understandable that determining the range hood's adjustment height based on the required airflow for fume extraction ensures effective fume removal under various cooking conditions, minimizing fume escape.

[0058] In one embodiment, the range hood includes a smoke collection hood, which includes a smoke inlet. Selectively adjusting the height of the range hood specifically involves selectively adjusting the height of the smoke inlet. The smoke inlet is located on the smoke collection hood, and its height can be adjusted by adjusting the height of the hood or a portion thereof.

[0059] Compared to adjusting the overall height of the range hood, adjusting the height of the smoke inlet allows for targeted adjustments based on the specific location where cooking fumes are generated. This ensures that fumes are quickly drawn in after they are generated, reducing escape. Furthermore, adjusting the height of the smoke inlet is simpler and doesn't significantly alter the range hood's center of gravity, ensuring stability during operation. Additionally, adjusting the smoke inlet height allows for greater flexibility in meeting different cooking needs, thus expanding the range hood's applicability.

[0060] Furthermore, before acquiring the real-time rotational speed of the fan and the real-time airflow of the range hood, the control method also includes adjusting the height of the smoke inlet to a preset height.

[0061] It should be noted that the preset height is the initial height of the smoke inlet, which can be set according to actual conditions. For example, in one embodiment, the optimal height, which is suitable for most users, is obtained after experimental testing. Since the preset height is already a verified and reasonable height, fine-tuning based on it can quickly achieve the ideal performance state without excessive trial and error. When it is necessary to adjust the height of the range hood's smoke inlet, starting the adjustment from the preset height can greatly improve the adjustment efficiency.

[0062] In another embodiment, setting the initial height to the maximum height of the smoke inlet allows for greater flexibility in handling different cooking needs, particularly suitable for scenarios where users frequently need to switch between kitchen utensils with significant height differences. Furthermore, setting the initial height to the maximum height of the smoke inlet means that the range hood has the maximum smoke capture range from the moment of initial installation or adjustment. This is especially important for handling large amounts of smoke or situations where smoke spreads rapidly during cooking, ensuring that smoke is effectively absorbed in its early stages and preventing it from escaping and polluting the kitchen environment.

[0063] In summary, this invention monitors the external impedance of the range hood and adjusts its height based on a comparison between the external impedance and a preset impedance threshold. This adjusts the distance between the smoke inlet and the countertop, thereby optimizing the smoke exhaust path and reducing resistance during the exhaust process. Consequently, it effectively reduces the external impedance of the range hood, which not only improves its smoke extraction efficiency and reduces smoke escape, but also reduces noise and energy consumption during operation, enhancing the user experience.

[0064] Example 2

[0065] Before, during, or after selectively adjusting the height of the range hood, the control method also includes selectively adjusting the fan speed based on the comparison results.

[0066] When the external impedance is greater than the preset impedance threshold, the exhaust capacity of the range hood can be increased by increasing the fan speed, thereby effectively overcoming the large external impedance and ensuring that the fumes are discharged smoothly.

[0067] Specifically, based on the comparison between the external impedance and the preset impedance threshold, the fan speed is selectively adjusted. In other words, the fan speed can be adjusted or not adjusted based on the magnitude of the comparison between the external impedance and the preset impedance threshold. This includes:

[0068] If the external impedance is less than or equal to the preset impedance threshold, the fan speed will not be adjusted.

[0069] When the external impedance is less than or equal to the preset impedance threshold, it means that the current fan speed is sufficient to effectively remove oil fumes. At this time, the fan speed remains unchanged, which can avoid unnecessary energy consumption and also avoid noise caused by changes in speed.

[0070] If the external impedance is greater than or equal to or greater than the preset impedance threshold, the fan speed will be increased.

[0071] When the external impedance is greater than or equal to or greater than the preset impedance threshold, that is, when the external impedance increases to the point where the range hood needs to use a higher air volume, the fan speed needs to be increased. This ensures that the range hood has enough power to remove the fumes.

[0072] Example 3

[0073] Based on Example 2, before determining to increase the fan speed, the control method further includes: adapting the fan speed to an adjustment strategy; obtaining the first air volume corresponding to the range hood before the speed adjustment, and estimating the second air volume corresponding to the speed adjustment based on the adjustment strategy, and calculating the air volume change rate; estimating the noise change of the range hood before and after the speed adjustment based on the adjustment strategy, and calculating the ratio of the air volume change rate to the noise change; comparing the ratio with a preset ratio, and selectively executing the adjustment strategy based on the comparison result.

[0074] Specifically, by measuring and analyzing some data of the range hood, a corresponding speed adjustment strategy can be adapted for the fan; alternatively, a unified initial speed adjustment strategy can be preset for the fan through multiple experimental tests.

[0075] In one embodiment, the speed adjustment strategy is to increase the fan speed, thereby correspondingly increasing the air volume of the range hood, so that the air volume of the range hood reaches or approaches the required air volume.

[0076] Furthermore, in order to obtain the noise change of the range hood before and after speed adjustment more quickly, the real-time speed of the fan (defined as the first speed) can be measured first, and the estimated adjustment speed of the fan in the adjustment strategy (defined as the second speed) can be read. After obtaining the first speed and the second speed, the noise change due to the increase in speed can be calculated according to the estimation formula of the sound power level of similar fans.

[0077] Specifically, the estimated change in noise level of the range hood before and after speed adjustment is calculated using the following formula:

[0078]

[0079] Where ΔL is the noise change, in dB; n a The first speed of the fan before speed adjustment, in rpm; nb This represents the second speed of the fan after the speed prediction adjustment, in rpm; m is a proportional constant.

[0080] It should be noted that the proportionality constant m reflects the quantitative relationship between the change in sound power level and the change in rotational speed ratio. It means that for every 1 dB change in sound power level, the logarithm of the corresponding rotational speed ratio multiplied by m is equal to the change in sound power level. In other words, m is the proportionality coefficient in the formula, and the value of m is derived from experimental data or empirical formulas. For example, m can be 50.

[0081] This allows for an assessment of the airflow gains and noise degradation caused by increasing fan speed before adjustments are made. By weighing the pros and cons based on the degree of airflow gains and noise degradation, it can be determined whether an adjustment strategy needs to be implemented. Only when the positive benefits of increased airflow outweigh the negative impact of increased noise will an adjustment strategy be implemented. This helps to increase airflow while keeping noise growth within an acceptable range for the user, achieving an effective balance between the range hood's smoke extraction effect and noise control, thereby effectively improving the user experience.

[0082] Furthermore, based on the comparison results, selectively implementing adjustment strategies includes:

[0083] If the ratio is greater than or equal to the preset ratio, the adjustment strategy will be executed.

[0084] If the ratio is less than or equal to or less than the preset ratio, an adjustment strategy will be executed and modified.

[0085] Understandably, by comparing the ratio of airflow change rate to noise change rate with a preset ratio, it can be ensured that while effectively enhancing the range hood's exhaust capacity, noise levels are not excessively increased, thus avoiding sacrificing auditory comfort for increased airflow. Adjustments are only implemented when the positive benefits of increased airflow outweigh the negative impact of increased noise. This balance between range hood performance and noise levels improves kitchen air quality while ensuring a superior user experience.

[0086] Please see Figure 3 If the current airflow of the range hood (i.e., the first airflow) and the second airflow corresponding to the estimated speed adjustment after the adjustment strategy are shown as points a and b in the diagram, respectively, in other words, in the adjustment strategy, the operating point needs to be changed from... Figure 3 Point a in the middle is transformed into Figure 3 At point b, the initial airflow is 11.6 m³ / s. 3 / min, less than the second air volume of 12.6m³. 3 / min, therefore the rotation speed needs to be increased, such as Figure 3 As shown, the engine speed needs to be increased from 1100rpm to 1200rpm.

[0087] However, as the rotation speed increases, the noise will also increase, leading to two possible scenarios. Scenario 1: Increasing the rotation speed results in a significant increase in airflow and a slight increase in noise. This indicates that the positive benefits of increased airflow outweigh the negative impact of increased noise, and the current adjustment strategy can be implemented. Scenario 2: Increasing the rotation speed results in a slight increase in airflow and a significant increase in noise. This indicates that the positive benefits of increased airflow are significantly less than the negative impact of increased noise, and the current adjustment strategy should not be implemented.

[0088] The present invention also provides a range hood, the range hood including a control device, the control device including a memory and a processor, the memory storing a computer program, and the processor being configured to execute the control method of the range hood in any of the foregoing technical solutions through the computer program.

[0089] In the description of this invention, "processor" can include hardware, software, or a combination of both. A processor can be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. A processor has data and / or signal processing capabilities. A processor can be implemented in software, in hardware, or a combination of both. Non-transitory computer-readable storage media includes any suitable medium capable of storing program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random access memory, etc.

[0090] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by hardware related to computer program instructions. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable storage medium can include any entity or device capable of carrying the computer program code, a medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory, a random access memory, an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0091] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A control method of an extractor hood, characterized in that, The range hood comprises a fan, and the control method comprises: obtaining a real-time rotating speed of the fan and a real-time air volume of the range hood; calculating an outlet static pressure of the range hood based on the real-time rotating speed, the real-time air volume, and a preset static pressure-air volume relationship model; calculating an external impedance of the range hood based on the real-time air volume and the outlet static pressure; comparing the external impedance with a preset impedance threshold, and selectively adjusting a height of the range hood according to a comparison result.

2. The control method of the range hood according to claim 1, characterized in that, The "selectively adjusting the height of the range hood according to the comparison result" comprises: if the external impedance is less than or equal to the preset impedance threshold, the height of the range hood is not adjusted; or if the external impedance is greater than or equal to the preset impedance threshold, the height of the range hood is reduced.

3. The control method of the range hood according to claim 1, characterized in that, The "selectively adjusting the height of the range hood" comprises: selecting a height adjustment amount of the range hood based on a preset air volume-height relationship, and adjusting the height of the range hood by the height adjustment amount.

4. The control method of a range hood according to any one of claims 1 to 3, characterized by, The range hood comprises a smoke collecting cover, the smoke collecting cover comprises a smoke suction port, and the "selectively adjusting the height of the range hood" comprises: selectively adjusting a height of the smoke suction port.

5. The control method of a range hood according to claim 4, characterized by, Before obtaining the real-time rotating speed of the fan and the real-time air volume of the range hood, the control method further comprises: adjusting the height of the smoke suction port to a preset height.

6. The control method of a range hood according to claim 1, characterized by, Before, simultaneously with, or after selectively adjusting the height of the range hood, the control method further comprises: selectively adjusting the rotating speed of the fan according to the comparison result.

7. The control method of the range hood according to claim 6, characterized by, The "selectively adjusting the rotating speed of the fan according to the comparison result" comprises: if the external impedance is less than or equal to the preset impedance threshold, the rotating speed of the fan is not adjusted; or if the external impedance is greater than or equal to the preset impedance threshold, the rotating speed of the fan is increased.

8. The control method of the range hood according to claim 1, characterized in that, The calculation formula of the external impedance is: S = P / Q 2 wherein, S is the external impedance of the range hood, P is the outlet static pressure of the range hood, and Q is the real-time air volume of the range hood.

9. The control method of the range hood according to claim 1, characterized in that, The preset static pressure-air volume relationship model is a set of static pressure-air volume relationship curves corresponding to a plurality of fan rotating speeds.

10. A range hood characterized by, The range hood comprises a control device, the control device comprises a memory and a processor, the memory stores a computer program, and the processor is configured to execute the control method of the range hood according to any one of claims 1 to 9 by using the computer program.

Images