Variable-frequency fan control method and device of range hood and range hood

Abstract

The invention discloses a control method and device for a variable-frequency fan of an extractor hood, the extractor hood and a storage medium. The control method comprises the steps that first back pressure borne by the extractor hood during operation is obtained, and the air volume of the variable-frequency fan of the extractor hood under the first back pressure is obtained; a target backpressure interval where the first backpressure is located is determined from a plurality of preset backpressure intervals, a plurality of operation frequency adjusting curves correspondingly associated with the target backpressure interval are obtained, and the operation frequency adjusting curves are used for adjusting the operation frequency of the frequency conversion draught fan; according to the air volume and the first back pressure, a target operation frequency adjusting curve of the frequency conversion fan is determined from the multiple operation frequency adjusting curves; and the operation frequency of the frequency conversion fan is adjusted according to the target operation frequency adjusting curve. According to the embodiment of the invention, the variable-frequency fan of the range hood is controlled more accurately, and the oil smoke suction effect of the range hood is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the range hood control technical field, and particularly relates to a range hood variable frequency fan control method and device and range hood. BACKGROUND

[0002] At present, intelligent equipment develops rapidly, and the range hood also gradually develops from the original fixed frequency control to variable frequency control. The range hood variable frequency control refers to setting a variable frequency fan in the range hood, and realizing the variable frequency working of the range hood through the intelligent control of the variable frequency fan. In the related technology, the variable frequency fan of the range hood generally controls the operating frequency of the variable frequency fan based on the indoor oil fume concentration, and the operating frequency adjustment mode of the variable frequency fan is relatively fixed. However, this adjustment mode ignores the influence of the back pressure on the air volume, resulting in poor oil fume suction effect of the range hood. SUMMARY

[0003] The main purpose of the present application is to provide a range hood variable frequency fan control method and device and range hood, and to provide a more accurate control mode for the variable frequency fan to improve the oil fume suction effect of the range hood.

[0004] To achieve the above purpose, in a first aspect, the present application provides a range hood variable frequency fan control method, which comprises:

[0005] obtaining a first back pressure suffered by the range hood when running, and obtaining the air volume of the variable frequency fan of the range hood when suffering the first back pressure;

[0006] determining a target back pressure interval where the first back pressure is located from a plurality of preset back pressure intervals, and obtaining a plurality of operating frequency adjustment curves corresponding to the target back pressure interval, the operating frequency adjustment curve being used to adjust the operating frequency of the variable frequency fan;

[0007] determining a target operating frequency adjustment curve of the variable frequency fan from the plurality of operating frequency adjustment curves according to the air volume and the first back pressure;

[0008] adjusting the operating frequency of the variable frequency fan according to the target operating frequency adjustment curve.

[0009] In a possible implementation, the determining of the target operating frequency adjustment curve of the variable frequency fan from the plurality of operating frequency adjustment curves according to the air volume and the first back pressure comprises:

[0010] determining that the back pressure gradually increases and the air volume is less than or equal to a first preset air volume threshold, and determining a first operating frequency adjustment curve as the target operating frequency adjustment curve of the variable frequency fan from the plurality of operating frequency adjustment curves;

[0011] determining that the air volume is greater than or equal to a second preset air volume threshold, and determining a second operating frequency adjustment curve as the target operating frequency adjustment curve of the variable frequency fan from the plurality of operating frequency adjustment curves.

[0012] The first preset air volume threshold is less than the second preset air volume threshold, and a frequency adjustment speed corresponding to the first operating frequency adjustment curve is greater than a frequency adjustment speed corresponding to the second operating frequency adjustment curve.

[0013] In a possible implementation, the determining the target operating frequency adjustment curve of the variable frequency fan from the plurality of operating frequency adjustment curves according to the air volume and the first back pressure comprises:

[0014] determining that the back pressure gradually decreases and the air volume is less than or equal to a first preset air volume threshold, and determining a third operating frequency adjustment curve as the target operating frequency adjustment curve of the variable frequency fan from the plurality of operating frequency adjustment curves;

[0015] determining that the air volume is greater than or equal to a second preset air volume threshold, and determining a fourth operating frequency adjustment curve as the target operating frequency adjustment curve of the variable frequency fan from the plurality of operating frequency adjustment curves.

[0016] The first preset air volume threshold is less than the second preset air volume threshold, and a frequency adjustment speed corresponding to the third operating frequency adjustment curve is less than a frequency adjustment speed corresponding to the fourth operating frequency adjustment curve.

[0017] In a possible implementation, the determining the target operating frequency adjustment curve of the variable frequency fan from the plurality of operating frequency adjustment curves according to the air volume and the first back pressure further comprises:

[0018] determining that the air volume is greater than the first preset air volume threshold and less than the second preset air volume threshold, and determining a fifth operating frequency adjustment curve as the target operating frequency adjustment curve of the variable frequency fan from the plurality of operating frequency adjustment curves.

[0019] In a possible implementation, the determining the target operating frequency adjustment curve of the variable frequency fan from the plurality of operating frequency adjustment curves according to the air volume and the first back pressure further comprises:

[0020] determining the first preset air volume threshold and the second preset air volume threshold according to the first back pressure.

[0021] In a possible implementation, the back pressure range includes a high back pressure range, a medium back pressure range and a low back pressure range, and each of the back pressure ranges is associated with a plurality of operation frequency adjustment curves, wherein:

[0022] the first operation frequency adjustment curves associated with different back pressure ranges are different; or

[0023] the second operation frequency adjustment curves associated with different back pressure ranges are different; or

[0024] the third operation frequency curves associated with different back pressure ranges are different; or

[0025] the third operation frequency curves associated with different back pressure ranges are different; or

[0026] the fourth operation frequency curves associated with different back pressure ranges are different.

[0027] In a possible implementation, after adjusting the operation frequency of the variable frequency fan according to the target operation frequency adjustment curve, the method further includes:

[0028] when the operation frequency of the variable frequency fan reaches a rated operation frequency, controlling the range hood to start a flue cleaning function.

[0029] Based on the above first aspect, a variable frequency fan control device of a range hood is further provided, and the variable frequency fan control device includes:

[0030] an acquisition unit, configured to acquire a first back pressure suffered by a range hood when the range hood is running, and acquire an air volume of a variable frequency fan of the range hood when the range hood suffers the first back pressure;

[0031] a determination unit, configured to determine a target back pressure range in which the first back pressure is located from a plurality of preset back pressure ranges, and acquire a plurality of operation frequency adjustment curves corresponding to the target back pressure range, the operation frequency adjustment curves being used to adjust an operation frequency of the variable frequency fan;

[0032] a processing unit, configured to determine a target operation frequency adjustment curve of the variable frequency fan from the plurality of operation frequency adjustment curves according to the air volume and the first back pressure;

[0033] a control unit, configured to adjust the operation frequency of the variable frequency fan according to the target operation frequency adjustment curve.

[0034] In a third aspect based on the first or second aspect above, an extractor hood is also provided, and the extractor hood includes a processor, a memory, a communication interface, and a communication bus, the processor, the memory, and the communication interface being in communication with each other via the communication bus.

[0035] The memory is configured to store at least one executable instruction, and the executable instruction causes the processor to execute the method of the first aspect above.

[0036] In a fourth aspect based on the first aspect above, a computer-readable storage medium is also provided, and the computer-readable storage medium stores a computer program, and the computer program, when executed by a processor, is configured to implement the method of the first aspect above.

[0037] In a fifth aspect, the present application also provides a computer program product, and the computer program product includes at least one executable instruction, and the executable instruction is configured to execute the method of the first aspect above.

[0038] The method, device, and extractor hood provided by the embodiments of the present application are configured to configure different operation frequency adjustment curves according to different back pressure intervals and the requirements of different scenes in each back pressure interval, obtain a first back pressure received by the extractor hood and an air volume of the variable frequency fan under the first back pressure during operation of the extractor hood, determine a target back pressure interval in which the first back pressure is located from among a plurality of preset back pressure intervals, obtain a plurality of operation frequency adjustment curves associated with the target back pressure interval, analyze an operation scene of the extractor hood according to the first back pressure and the air volume, obtain a target operation frequency adjustment curve matched from the plurality of operation frequency adjustment curves based on the operation scene, and control the variable frequency fan to operate according to the target operation frequency adjustment curve, so that the extractor hood can achieve a better oil fume extraction effect in different operation scenes. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 A flowchart of a variable frequency fan control method of an extractor hood is provided for an embodiment of the present application;

[0040] Figure 2 A flowchart of a variable frequency fan control method of an extractor hood is provided for another embodiment of the present application;

[0041] Figure 3 A flowchart of a variable frequency fan control method of an extractor hood is provided for another embodiment of the present application;

[0042] Figure 4 A structural diagram of a variable frequency extractor hood control device is provided for an embodiment of the present application.

[0043] The objectives, functional characteristics and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts should fall within the scope of the present application.

[0045] The terms "first", "second", "third", "fourth" and the like in the description and in the claims of the present application and in the above description of the drawings are used for distinguishing between similar objects and not necessarily for describing a specific sequential or chronological order. It is to be understood that the use of the terms so construed can interchange depending on the context in which it is used. For example, a first information can be termed a second information and similarly, a second information can be termed a first information without departing from the scope of the present disclosure.

[0046] Depending on the context, the word "if" as used herein can be interpreted to mean "when" or "in response to determining" or "in response to ascertaining".

[0047] Further, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise.

[0048] It will be further understood that the terms "comprises" and "comprising", "includes" and "including" mean that there are no other features, steps, operations, elements, components, items, species, and / or groups that are present in the described implementation, but it does not, by itself, preclude the implicit presence of one or more other features, steps, operations, elements, components, items, species, and / or groups.

[0049] The terms "or" and "and / or" as used herein are to be interpreted as inclusive, i.e., as meaning one or any combination of the conjunctive terms. Thus, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". An exception to this definition will occur only when a combination of elements, functions, steps or acts are in some way inherently mutually exclusive.

[0050] The intelligent range hood adjusts the operation frequency of the variable frequency fan based on the indoor oil fume concentration. Compared with the fixed frequency range hood, the oil fume suction effect is better, and energy is saved, so the intelligentization of the range hood becomes a development trend. At present, the related intelligent range hood still has defects, such as the control mode of the variable frequency fan is relatively single, and the adjustment of the operation frequency of the variable frequency fan is determined according to the difference between the oil fume concentration and the target oil fume concentration. However, during the working process of the range hood, the environment is relatively complex, and there are many factors affecting the oil fume suction effect of the range hood. Based on this single control mode, the oil fume suction effect of the range hood is not good.

[0051] Based on this, the embodiment of the present application provides a variable frequency fan control method of a range hood, sets multiple operation frequency adjustment modes of the variable frequency fan, selects the adjustment mode suitable for the scene to adjust the variable frequency fan in different scenes, so that the oil fume suction effect of the range hood can achieve a better oil fume suction effect in different scenes.

[0052] The technical solutions of the present application will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0053] Referring to Figure 1 The embodiment of the present application provides a flowchart of a variable frequency fan control method of a range hood, and the method comprises:

[0054] S101, acquiring a first back pressure received by the range hood during operation, and acquiring the air volume of the variable frequency fan of the range hood when the first back pressure is received;

[0055] The range hood comprises a variable frequency fan and a processor, and the variable frequency fan is controlled by the processor.

[0056] In some embodiments, when the range hood is turned on, the control method provided by the embodiment of the present application is executed to control the operation of the variable frequency fan.

[0057] In some embodiments, the range hood comprises a normal mode and a high-efficiency mode, wherein in the normal mode, the range hood controls the operation of the variable frequency fan based on the oil fume concentration; and in the high-efficiency mode, the operation of the variable frequency fan is controlled based on the method provided by the embodiment of the present application. After the range hood is turned on, it is determined whether the current time is a cooking peak period. If yes, the high-efficiency mode is selected to be turned on, and if no, the normal mode is selected to be turned on. Alternatively, the range hood can be manually selected by the user to turn on the high-efficiency mode. In the cooking peak period, the public flue pressure is relatively large, and the oil fume suction effect is greatly affected by the external pressure, so the high-efficiency mode is selected in the cooking peak period, which can improve the oil fume suction effect of the range hood.

[0058] It can be understood that in the embodiments of the present application, the range hood can determine whether the current time is the cooking peak period by acquiring the flue pressure of the public flue; or determine whether the current time is the cooking peak period based on whether the current time is in the preset time period.

[0059] The oil fume suction effect of the range hood is mainly affected by factors such as back pressure in the pipeline, static pressure of the variable frequency fan, and air volume of the variable frequency fan. Therefore, in the embodiments of the present application, different control modes are set in combination with factors such as back pressure and air volume to control the variable frequency fan, so that the range hood can achieve better oil fume suction effect in different scenarios.

[0060] During the operation of the range hood, the back pressure in the pipeline can change continuously, so the first back pressure obtained at different times can be different. Correspondingly, the air volume of the variable frequency fan can also be different when affected by the first back pressure. Therefore, the air volume of the variable frequency fan is obtained at the same time as the first back pressure of the range hood is obtained, and then the operating frequency of the variable frequency fan is adjusted in combination with the first back pressure and the air volume, so as to ensure that the air volume of the variable frequency fan is sufficient to achieve effective exhaust effect.

[0061] As an implementation manner, a back pressure detection device can be arranged in the range hood to detect the first back pressure received by the range hood during operation. Correspondingly, an air volume detection device can be arranged in the range hood to detect the air volume of the variable frequency fan.

[0062] As another implementation manner, to reduce the cost of the range hood, the back pressure detection device and the air volume detection device can not be arranged, and the first back pressure received by the range hood and the air volume of the variable frequency fan when receiving the first back pressure can be calculated according to the working parameters such as power, current, torque, and current of the variable frequency fan.

[0063] S102, determining a target back pressure interval in which the first back pressure is located from a plurality of preset back pressure intervals, and acquiring a plurality of running frequency adjustment curves corresponding to the target back pressure interval;

[0064] The running frequency adjustment curve refers to the running frequency adjustment curve of the variable frequency fan, and is used to adjust the running frequency of the variable frequency fan.

[0065] In one or more embodiments of the present application, a plurality of back pressure intervals are preset based on the range of back pressure that the range hood can be subjected to when operating, for example, the back pressure intervals include a high back pressure interval, a medium back pressure interval and a low back pressure interval. For example, the interval of standard static pressure 800 pa or more is configured as the high back pressure interval, the interval of standard static pressure 400 pa to 800 pa is configured as the medium back pressure interval, and the interval of standard static pressure 400 pa or less is configured as the low back pressure interval. It should be noted that when the standard static pressure of the variable frequency fan is greater than the back pressure, the range hood can successfully remove the oil fume, and the standard static pressure changes with the change of the back pressure, so the standard static pressure of the variable frequency fan reflects the change trend and size of the back pressure. Among them, when the variable frequency fan operates in the low pressure interval, the resistance of the variable frequency fan is the smallest, and a large air volume can be achieved, so the low back pressure interval is also a large flow interval. In addition, more back pressure intervals can also be set based on actual needs to achieve more fine interval control, which will not be listed here.

[0066] Based on the fact that the size of the back pressure affects the oil fume suction effect of the range hood, and under the same back pressure, the air volume of the variable frequency fan affects the oil fume suction effect of the range hood. In order to guarantee the oil fume suction effect of the range hood in different scenarios, different operating frequency adjustment curves are configured in the same back pressure interval according to the influence of the air volume of the variable frequency fan and the like on the oil fume suction effect. Different back pressure intervals are configured with different operating frequency adjustment curves based on different back pressures. Therefore, each back pressure interval corresponds to a plurality of operating frequency adjustment curves, and the operating frequency adjustment curves associated with each back pressure interval can be different.

[0067] After obtaining the first back pressure of the range hood, the target back pressure interval in which the first back pressure is located is determined from the plurality of preset back pressure intervals. For example, when the first back pressure is 700 Pa, the target back pressure interval in which the first back pressure is located is the medium back pressure interval, and then a target operating frequency adjustment curve is determined from the operating frequency adjustment curves associated with the medium back pressure interval, which is used to adjust the operating frequency of the variable frequency fan.

[0068] S103, determining the target operating frequency adjustment curve of the variable frequency fan from the plurality of operating frequency adjustment curves according to the air volume and the first back pressure;

[0069] In some implementations, in the back pressure interval, the air volume is divided into a plurality of air volume intervals, such as a high air volume interval and a low air volume interval, and different air volume intervals are configured with different operating frequency adjustment curves; or, in combination with the change of the first back pressure, different operating frequency adjustment curves are correspondingly configured in the same air volume interval. Therefore, during the operation of the range hood, after the air volume and the first back pressure are obtained, the target operating frequency adjustment curve of the variable frequency fan can be determined from the plurality of operating frequency adjustment curves corresponding to the target back pressure interval.

[0070] In some embodiments, in each back pressure interval, at least two operation frequency adjustment curves are configured, for example, a first operation frequency adjustment curve and a second operation frequency adjustment curve. The frequency adjustment speed corresponding to the first operation frequency adjustment curve is greater than the frequency adjustment speed corresponding to the second operation frequency adjustment curve, that is, the operation frequency of the variable frequency fan is adjusted based on the first operation frequency adjustment curve, and the operation frequency of the variable frequency fan changes rapidly. Based on the operation scenarios that may occur during the operation of the range hood, a low air volume scenario and a high air volume scenario are defined, the low air volume scenario is associated with the first operation frequency adjustment curve, and the high air volume scenario is associated with the second operation frequency adjustment curve. Therefore, during the operation of the range hood, whether the range hood is in the low air volume scenario or the high air volume scenario is determined according to the air volume and the first back pressure, and then the target operation frequency adjustment curve of the variable frequency fan is determined based on the operation frequency adjustment curve associated with the low air volume scenario or the high air volume scenario.

[0071] In S104, the operation frequency of the variable frequency fan is adjusted according to the target operation frequency adjustment curve.

[0072] The range hood adjusts the variable frequency fan according to the target operation frequency adjustment curve, so that the range hood achieves a better oil fume suction effect in the corresponding scenario.

[0073] In the low air volume scenario, the variable frequency fan has a low air volume and is affected by the back pressure, and the range hood has a poor oil fume exhaust effect, so the speed of the variable frequency fan needs to be increased, and therefore the operation frequency of the variable frequency fan needs to be increased. In this scenario, if the operation frequency adjustment speed of the variable frequency fan is too slow, the back pressure may accumulate and rapidly increase, and the variable frequency fan needs to suddenly increase the speed to a large operation frequency. The static pressure of the variable frequency fan may still be low, even lower than the back pressure, that is, the static pressure adjustment lags behind, which may cause oil fume backflow and affect the adjustment effect of the range hood. In the high air volume scenario, although affected by the back pressure, the air volume is large, and the range hood has a normal oil fume exhaust effect, so no large adjustment of the variable frequency fan is needed. Therefore, the adjustment requirements of the variable frequency fan are different in different scenarios. If a single adjustment method is used, the risk of oil fume backflow may occur in the low air volume scenario, or the operation frequency adjustment of the variable frequency fan is too large in the high air volume scenario, resulting in resource waste.

[0074] Optionally, after S104, the method further includes: when the operation frequency of the variable frequency fan reaches the rated operation frequency, controlling the range hood to start a flue cleaning function. That is, when the operation frequency of the variable frequency fan is adjusted to the maximum value, if the back pressure of the range hood cannot be reduced, the range hood is controlled to start the flue cleaning function to automatically clean the flue, so as to reduce the back pressure of the flue by cleaning the flue.

[0075] Therefore, the embodiment of the present application configures different running frequency adjustment curves according to different back pressure intervals and the requirements of different scenarios under each back pressure interval. During the operation of the range hood, the first back pressure received by the range hood and the air volume of the frequency conversion fan under the first back pressure are obtained, and then the target back pressure interval in which the first back pressure is located is determined from the plurality of preset back pressure intervals, the plurality of running frequency adjustment curves corresponding to the target back pressure interval are obtained, the running scenario of the range hood is analyzed according to the first back pressure and the air volume, the target running frequency adjustment curve matched from the plurality of running frequency adjustment curves is obtained based on the running scenario, and the frequency conversion fan is controlled to operate according to the target running frequency adjustment curve, so that the range hood can achieve a better oil fume suction effect under different running scenarios.

[0076] Figure 2 The flowchart of the control method of the frequency conversion fan of the range hood provided by another embodiment of the present application is shown in the figure. Based on the foregoing embodiment, the step S103 is further refined, as shown in the figure, which comprises: Figure 2

[0077] S201, when the back pressure received by the range hood gradually increases, it is determined whether the air volume is less than or equal to the first preset air volume threshold according to the first back pressure and the second back pressure obtained in the previous period;

[0078] In this step, the previous time period refers to the time period adjacent to the first back pressure acquisition time, and the second back pressure obtained in this time period includes at least one. For example, if the first back pressure is obtained at T1, the previous time period refers to the time period before T1-1.

[0079] The difference between the first back pressure and the second back pressure can be used to determine the back pressure change trend. For example, when the difference between the first back pressure and the second back pressure is greater than zero, it indicates that the back pressure change trend is gradually increasing; when the difference between the first back pressure and the second back pressure is less than zero, it indicates that the back pressure change trend is gradually decreasing.

[0080] In some examples, when the back pressure received by the range hood rises from the low back pressure interval to the medium back pressure interval, the back pressure change trend gradually increases. When the back pressure received by the range hood decreases from the high back pressure interval to the medium back pressure interval, the back pressure change trend gradually decreases. That is, when the second back pressure received by the range hood is in the medium back pressure interval, the back pressure may gradually increase or gradually decrease, and when the back pressure gradually increases, the back pressure may rise to the high back pressure interval, and when the back pressure gradually decreases, the back pressure may decrease to the low back pressure interval.

[0081] ​The embodiment comprehensively considers the back pressure change trend and the air volume of the variable frequency fan, and divides the operation scene into a low air volume scene 1 and a high air volume scene 1 based on the operation scene in which the back pressure gradually increases during operation of the range hood. For example, the scene in which the back pressure gradually increases and the air volume is low is the low air volume scene 1, and the scene in which the back pressure gradually increases and the air volume is large is the high air volume scene 1. The low air volume scene 1 is associated with the first operation frequency adjustment curve, and the high air volume scene 1 is associated with the second operation frequency adjustment curve.

[0082] In an optional implementation, the first preset air volume threshold and the second preset air volume threshold are configured, and the first preset air volume threshold is smaller than the second preset air volume threshold. The first preset air volume threshold and the second preset air volume threshold are used to determine the operation scene of the range hood. For example, when the air volume is less than or equal to the first preset air volume threshold, it is determined that the operation scene is the low air volume scene 1, and when the air volume is greater than or equal to the second preset air volume threshold, it is determined that the operation scene is the high air volume scene 1.

[0083] Therefore, in this step, when the back pressure received by the range hood gradually increases, it is determined whether the air volume is less than or equal to the first preset air volume threshold to determine the operation scene of the range hood.

[0084] If yes, S202 is performed, and the first operation frequency adjustment curve is determined as the target operation frequency adjustment curve of the variable frequency fan from the multiple operation frequency adjustment curves;

[0085] If no, S203 is performed, and it is determined whether the air volume is greater than or equal to the second preset air volume threshold;

[0086] If yes, S204 is performed, and the second operation frequency adjustment curve is determined as the target operation frequency adjustment curve of the variable frequency fan from the multiple operation frequency adjustment curves.

[0087] It should be noted that in the scene in which the back pressure gradually increases, whether the back pressure will rise to a higher back pressure interval is also related to the air volume generated by the variable frequency fan. Under the same back pressure, the air volume of the variable frequency fan can be different. When the air volume of the variable frequency fan is large, the back pressure can not rise to a higher back pressure interval, and when the air volume of the variable frequency fan is small, the back pressure rises to a higher back pressure interval.

[0088] In the operation scenario where the back pressure gradually increases, if the air volume of the variable frequency fan is low, the back pressure can quickly increase and can increase from the low back pressure range to the high back pressure range. Therefore, in this scenario, the operating frequency of the variable frequency fan needs to be adjusted to a certain value in advance. If the air volume of the variable frequency fan is large, the back pressure will not quickly increase, so the adjustment speed requirement of the operating frequency of the variable frequency fan is low in this scenario. Based on this, the first operating frequency adjustment curve is configured to have a frequency adjustment speed greater than the frequency adjustment speed of the second operating frequency. When the air volume is less than or equal to the first preset air volume threshold, the first operating frequency adjustment curve is used as the target operating frequency adjustment curve; when the air volume is greater than or equal to the second preset air volume threshold, the second operating frequency adjustment curve is used as the target operating frequency adjustment curve.

[0089] Optionally, after adjusting the variable frequency fan based on the first operating frequency adjustment curve, the operating frequency of the variable frequency fan approaches the upper limit operating frequency corresponding to the target back pressure range (or approaches the lower limit operating frequency of the back pressure range higher than the target back pressure range). For example, when the first back pressure is in the medium back pressure range, if the back pressure gradually increases and the air volume is less than or equal to the first preset air volume threshold, the back pressure received by the range hood has the possibility of increasing to the high back pressure range, the first operating frequency adjustment curve is used to quickly adjust the operating frequency of the variable frequency fan to approach the required operating frequency corresponding to the high back pressure range, and the static pressure of the variable frequency fan is adjusted in advance, so that the static pressure is always greater than the back pressure, which can avoid the situation of oil fume backflow when the back pressure increases to the high back pressure range.

[0090] Optionally, after adjusting the variable frequency fan based on the second operating frequency adjustment curve, the operating frequency of the variable frequency fan is less than the upper limit operating frequency of the target back pressure range. For example, when the first back pressure is in the medium back pressure range, if the air volume is greater than or equal to the second preset air volume threshold, the back pressure received by the range hood will not increase to the high back pressure range, the second operating frequency adjustment curve is used to adjust the operating frequency of the variable frequency fan, which can reduce the adjustment amount or the adjustment speed of the operating frequency, thereby saving energy.

[0091] Optionally, the first preset air volume threshold can also be equal to the first preset air volume threshold. If the first preset air volume threshold is less than the second preset air volume threshold, when the air volume is greater than the first preset air volume threshold and less than the second preset air volume threshold, the fifth operating frequency adjustment curve is determined as the target operating frequency adjustment curve of the variable frequency fan from the plurality of operating frequency adjustment curves.

[0092] That is, in this embodiment, the back pressure range is also associated with the fifth operating frequency adjustment curve, and when the operation scenario of the range hood does not satisfy the low air volume scenario 1 and the high air volume scenario 1, the fifth operating frequency adjustment curve is used as the target operating frequency adjustment curve of the variable frequency fan.

[0093] Optionally, in some embodiments, the first preset air volume threshold and the second preset air volume threshold can be preset fixed values. For example, according to the relationship between the back pressure and the air volume of the range hood determined by testing or analysis, when the back pressure has the possibility of rising to the high back pressure interval, the air volume critical value of the corresponding variable frequency fan is configured as the first preset air volume threshold, and when the back pressure does not have the possibility of rising to the high back pressure interval, the air volume critical value of the corresponding variable frequency fan is configured as the second preset air volume threshold.

[0094] In some embodiments, the first preset air volume threshold and the second preset air volume threshold are related to the size of the back pressure, and the first preset air volume threshold and the second preset air volume threshold are different corresponding to different back pressures. That is, the first preset air volume threshold and the second preset air volume threshold are determined based on the back pressure (or static pressure). Specifically, according to the air volume critical value of the corresponding variable frequency fan when each back pressure has the possibility of rising to the high back pressure interval, the first preset air volume threshold is configured as the first preset air volume threshold, and the first preset air volume threshold set according to the size of the back pressure is obtained. Correspondingly, when each back pressure does not have the possibility of rising to the high back pressure interval, the air volume critical value of the corresponding variable frequency fan is configured as the second preset air volume threshold, and the second preset air volume threshold set according to the size of the back pressure is obtained. After obtaining the first back pressure, the first preset air volume threshold and the second preset air volume threshold are determined according to the first back pressure, and then the running scene of the range hood is determined based on the comparison result of the air volume and the first preset air volume threshold and the second preset air volume threshold. Since the influence of air volume on the rising trend of back pressure is different under different back pressures, the first preset air volume threshold and the second air volume threshold are determined based on the back pressure in this embodiment, which improves the accuracy of judging whether the back pressure rises to the high back pressure interval, improves the precision of variable frequency fan control, and improves the oil fume suction effect of the range hood.

[0095] For example, when the first back pressure is 710 Pa, the first preset air volume threshold is A1 and the second preset air volume threshold is B1; when the first back pressure is 730 Pa, the first preset air volume threshold is A2 and the second preset air volume threshold is B2.

[0096] In some embodiments, the first running frequency adjustment curve, the second running frequency adjustment curve, and the fifth running frequency adjustment curve associated with each back pressure interval are different, and each first running frequency adjustment curve, second running frequency adjustment curve, and fifth running frequency adjustment curve is set according to the properties of the back pressure interval. The running frequency of the variable frequency fan is controlled in combination with the back pressure interval, the air volume, and the running scene, etc. parameters, to improve the accuracy of running frequency adjustment, and thus improve the oil fume suction effect of the range hood.

[0097] In this embodiment, different operation frequency adjustment curves are configured according to different back pressures and air volumes in the same back pressure interval. Different operation frequency adjustment curves are adopted for different operation scenarios of the range hood to adjust the variable frequency fan and perform more precise variable frequency control on the variable frequency fan, so that the range hood can achieve better oil fume suction effect in different operation scenarios.

[0098] Figure 3 The flowchart of the variable frequency fan control method of the range hood provided for another embodiment of the present application is shown in FIG. 10. Based on the foregoing embodiment, step S103 is further refined in this embodiment, as shown in FIG. 10, and includes: Figure 3

[0099] S301, determining whether the air volume is less than or equal to the first preset air volume threshold when the back pressure gradually decreases according to the first back pressure and the second back pressure obtained in the previous period.

[0100] In this embodiment, the determination manner of the back pressure change trend of the range hood is the same as that of S201 in the foregoing Figure 2 embodiment, and the specific implementation process and principles can be referred to the foregoing embodiment, which will not be described here.

[0101] In some examples, when the back pressure of the range hood rises from the low back pressure interval to the medium back pressure interval, the back pressure change trend gradually increases. When the back pressure of the range hood decreases from the high back pressure interval to the medium back pressure interval, the back pressure change trend gradually decreases. That is, when the second back pressure of the range hood is in the medium back pressure interval, the back pressure may gradually increase or gradually decrease. When the back pressure gradually increases, the back pressure may rise to the high back pressure interval. When the back pressure gradually decreases, the back pressure may decrease to the low back pressure interval.

[0102] This embodiment comprehensively considers the back pressure change trend and the air volume of the variable frequency fan, divides the operation scenarios into a low air volume scenario 2 and a high air volume scenario 2 based on the operation scenario in which the back pressure gradually decreases during the operation of the range hood. For example, the scenario in which the back pressure gradually decreases and the air volume is low is the low air volume scenario 2, and the scenario in which the back pressure gradually decreases and the air volume is large is the high air volume scenario 2. The low air volume scenario 2 is associated with a third operation frequency adjustment curve, and the high air volume scenario 2 is associated with a fourth operation frequency adjustment curve.

[0103] In an optional implementation manner, the first preset air volume threshold and the second preset air volume threshold are configured, and the first preset air volume threshold is less than the second preset air volume threshold. The first preset air volume threshold and the second preset air volume threshold are used to determine the operation scenario of the range hood. For example, when the air volume is less than or equal to the first preset air volume threshold, it is determined that the operation scenario is the low air volume scenario 2, and when the air volume is greater than or equal to the second preset air volume threshold, it is determined that the operation scenario is the high air volume scenario 2.

[0104] ​Therefore, in this step, when the back pressure gradually decreases, it is determined whether the air volume is less than or equal to the first preset air volume threshold, to determine the operation scene of the range hood.

[0105] If yes, S302 is performed, and the third operation frequency adjustment curve is determined as the target operation frequency adjustment curve of the variable frequency fan from the plurality of operation frequency adjustment curves;

[0106] If no, S303 is performed, and it is determined whether the air volume is greater than or equal to the second preset air volume threshold;

[0107] If yes, S304 is performed, and the fourth operation frequency adjustment curve is determined as the target operation frequency adjustment curve of the variable frequency fan from the plurality of operation frequency adjustment curves;

[0108] The first preset air volume threshold is less than the second preset air volume threshold, and the frequency adjustment speed corresponding to the third operation frequency adjustment curve is less than the frequency adjustment speed of the fourth operation frequency adjustment curve.

[0109] It should be noted that in the scenario of gradually decreasing back pressure, whether the back pressure will drop to the low back pressure interval also relates to the air volume generated by the variable frequency fan. At the same back pressure, when the air volume of the variable frequency fan is large, the back pressure will drop to the low back pressure interval, and when the air volume of the variable frequency fan is small, the back pressure can not drop to the low back pressure interval.

[0110] In the operation scene of gradually decreasing back pressure, if the air volume of the variable frequency fan is large, it can drop to the low back pressure interval, and can drop from the high back pressure interval to the low back pressure interval. Therefore, in this scenario, the operation frequency of the variable frequency fan can be reduced in advance to reduce the energy consumption of the variable frequency fan. If the air volume of the variable frequency fan is small, the back pressure will not decrease rapidly, and can be maintained in the back pressure interval, so the demand speed of the operation frequency of the variable frequency fan is low in this scenario. Based on this, the frequency adjustment speed corresponding to the third operation frequency adjustment curve is configured to be less than the frequency adjustment speed corresponding to the fourth operation frequency. When the air volume is less than or equal to the first preset air volume threshold, the third operation frequency adjustment curve is used as the target operation frequency adjustment curve; and when the air volume is greater than or equal to the second preset air volume threshold, the fourth operation frequency adjustment curve is used as the target operation frequency adjustment curve.

[0111] Optionally, after adjusting the variable frequency fan based on the third operation frequency adjustment curve, the operation frequency of the variable frequency fan is greater than the lower limit operation frequency of the target back pressure interval. For example, when the first back pressure is in the medium back pressure interval, if the air volume is less than or equal to the second preset air volume threshold, the back pressure of the range hood will not decrease to the low back pressure interval, the third operation frequency adjustment curve is used to adjust the operation frequency of the variable frequency fan, to avoid excessive adjustment of the operation frequency, and to avoid the back pressure from increasing.

[0112] Optionally, after adjusting the frequency conversion fan based on the fourth operating frequency adjustment curve, the operating frequency of the frequency conversion fan approaches the lower limit operating frequency corresponding to the target back pressure interval (or approaches the upper limit operating frequency of the back pressure interval lower than the target back pressure interval). For example, when the first back pressure is in the medium back pressure interval, if the back pressure gradually decreases and the air volume is greater than or equal to the second preset air volume threshold, the back pressure received by the range hood has the possibility of decreasing to the low back pressure interval, then the fourth operating frequency adjustment curve is used to quickly adjust the operating frequency of the frequency conversion fan to approach the required operating frequency corresponding to the low back pressure interval, thereby saving energy.

[0113] Optionally, the first preset air volume threshold can also be equal to the first preset air volume threshold. If the first preset air volume threshold is less than the second preset air volume threshold, when the air volume is greater than the first preset air volume threshold and less than the second preset air volume threshold, the fifth operating frequency adjustment curve is determined as the target operating frequency adjustment curve of the frequency conversion fan from the plurality of operating frequency adjustment curves.

[0114] That is, in this embodiment, the back pressure interval is also associated with the fifth operating frequency adjustment curve, and when the operating scenario of the range hood does not meet the low air volume scenario 1 and the high air volume scenario 1, the fifth operating frequency adjustment curve is used as the target operating frequency adjustment curve of the frequency conversion fan.

[0115] Optionally, in some embodiments, the first preset air volume threshold and the second preset air volume threshold can be pre-set fixed values. For example, according to the test or analysis of the relationship between the back pressure received by the range hood and the air volume, when it is determined that the back pressure has the possibility of increasing to the high back pressure interval, the corresponding air volume threshold of the frequency conversion fan is configured as the first preset air volume threshold, and correspondingly, when the back pressure does not have the possibility of increasing to the high back pressure interval, the corresponding air volume threshold of the frequency conversion fan is configured as the second preset air volume threshold.

[0116] In some embodiments, the first preset air volume threshold and the second preset air volume threshold are related to the size of the back pressure. Different back pressures correspond to different first preset air volume thresholds and second preset air volume thresholds. That is, the first preset air volume threshold and the second preset air volume threshold are determined based on the back pressure (or static pressure). Specifically, according to each back pressure, when there is a possibility of rising to the high back pressure interval, the corresponding air volume critical value of the variable frequency fan is configured as the first preset air volume threshold, and a first preset air volume threshold set that changes according to the back pressure size is obtained; correspondingly, under each back pressure, when there is no possibility of rising to the high back pressure interval, the corresponding air volume critical value of the variable frequency fan is configured as the second preset air volume threshold, and a second preset air volume threshold set that changes according to the back pressure size is obtained. After obtaining the first back pressure, the first preset air volume threshold and the second preset air volume threshold are determined according to the first back pressure, and then the operating scenario of the range hood is determined based on the comparison results of the air volume and the first preset air volume threshold and the second preset air volume threshold. Since the influence of air volume on the back pressure rising trend is different under different back pressures, this embodiment determines the first preset air volume threshold and the second air volume threshold based on the back pressure, thereby improving the accuracy of judging whether the back pressure rises to the high back pressure range, improving the accuracy of the variable frequency fan control, and improving the oil fume extraction effect of the range hood.

[0117] For example, when the first back pressure is 710Pa, the corresponding first preset air volume threshold is A1, and the second preset air volume threshold is B1; when the first back pressure is 730Pa, the corresponding first preset air volume threshold is A2, and the second preset air volume threshold is B2.

[0118] In some embodiments, each backpressure range is associated with a different third, fourth, and fifth operating frequency adjustment curve. Each third, fourth, and fifth operating frequency adjustment curve is specifically configured based on the properties of the backpressure range. By combining parameters such as the backpressure range, air volume, and operating scenario to control the operating frequency of the variable frequency fan, the accuracy of frequency adjustment is improved, thereby enhancing the range hood's fume extraction efficiency.

[0119] In this embodiment, in the same back pressure range, different operating frequency adjustment curves are configured according to different back pressures and air volumes. Different operating frequency adjustment curves are used for different operation scenarios of the range hood. The variable frequency fan is adjusted and more precise frequency control is performed on the variable frequency fan, so that the range hood can achieve better oil fume extraction effect in different operation scenarios.

[0120] like Figure 4 As shown, the embodiment of the present application further provides a variable frequency fan control device for a range hood, the control device 40 comprising:

[0121] The acquisition unit 401 is configured to acquire a first back pressure suffered by the range hood when the range hood is running, and acquire an air volume of the variable frequency fan of the range hood when the range hood is subjected to the first back pressure.

[0122] The determination unit 402 is configured to determine a target back pressure interval in which the first back pressure is located from a plurality of preset back pressure intervals, and acquire a plurality of operation frequency adjustment curves corresponding to the target back pressure interval in association, the operation frequency adjustment curve being used to adjust an operation frequency of the variable frequency fan.

[0123] The processing unit 403 is configured to determine a target operation frequency adjustment curve of the variable frequency fan from the plurality of operation frequency adjustment curves according to the air volume and the first back pressure.

[0124] The control unit 404 is configured to adjust the operation frequency of the variable frequency fan according to the target operation frequency adjustment curve.

[0125] The range hood variable frequency fan control device provided by the embodiment of the present application can perform each step involved in the above-mentioned corresponding method embodiments, and has similar implementation principles and technical effects, which will not be described here again.

[0126] The present application also provides an electronic device, which comprises a memory, a processor, and a camera connection program stored in the memory and executable on the processor, and each embodiment of the range hood variable frequency fan control method is implemented when the camera connection program is executed by the processor.

[0127] In addition, the present application also provides a computer readable storage medium, and the camera connection program is stored on the computer readable storage medium, and each embodiment of the range hood variable frequency fan control method is implemented when the camera connection program is executed by the processor.

[0128] The present embodiment also provides a computer program product, which, when running on a computer, causes the computer to perform the above-mentioned related steps to realize each embodiment of the range hood variable frequency fan control method provided by the above-mentioned embodiments.

[0129] Among them, the device, computer readable storage medium, computer program product or chip provided by the embodiment are used to execute the corresponding method provided above, so the beneficial effects that can be achieved are referred to the beneficial effects in the corresponding method provided above, which will not be described here again.

[0130] Those skilled in the art can clearly understand the above-mentioned embodiment method can be realized by means of software and the necessary general hardware platform, of course, can also be through hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application essentially or say the part of the prior art contribution can be embodied in the form of software products, the computer software product is stored in the above-mentioned storage medium (such as ROM / RAM, magnetic disc, optical disc), including a number of instructions to make a terminal device (may be a mobile phone, computer, server, air conditioner, or network equipment, etc.) executes the method of each embodiment of the present application.

[0131] The above is only the preferred embodiment of the present application, not therefore limit the patent scope of the present application, any equivalent structure or equivalent process transformation using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for controlling a variable frequency fan of a range hood, characterized in that: The method comprises: obtaining a first back pressure to which the range hood is subjected during operation, and obtaining an air volume of a variable frequency fan of the range hood when subjected to the first back pressure; Determining a target back pressure interval in which the first back pressure is located from a plurality of preset back pressure intervals, and obtaining a plurality of operating frequency adjustment curves corresponding to the target back pressure interval, wherein the operating frequency adjustment curves are used to adjust the operating frequency of the variable frequency fan; determining a target operating frequency adjustment curve for the variable frequency fan from the plurality of operating frequency adjustment curves according to the air volume and the first back pressure; The operating frequency of the variable frequency fan is adjusted according to the target operating frequency adjustment curve.

2. The method according to claim 1, wherein Determining a target operating frequency adjustment curve for the variable frequency fan from the plurality of operating frequency adjustment curves according to the air volume and the first back pressure includes: When it is determined, based on the first back pressure and the second back pressure obtained in the previous time period, that the back pressure on the range hood is gradually increasing and the air volume is less than or equal to a first preset air volume threshold, determining a first operating frequency adjustment curve from the multiple operating frequency adjustment curves as the target operating frequency adjustment curve for the variable frequency fan; When the air volume is greater than or equal to a second preset air volume threshold, determining a second operating frequency adjustment curve from the multiple operating frequency adjustment curves as the target operating frequency adjustment curve of the variable frequency fan; The first preset air volume threshold is smaller than the second preset air volume threshold, and the frequency adjustment speed corresponding to the first operating frequency adjustment curve is greater than the frequency adjustment speed corresponding to the second operating frequency.

3. The method according to claim 1, wherein Determining a target operating frequency adjustment curve for the variable frequency fan from the plurality of operating frequency adjustment curves according to the air volume and the first back pressure includes: When it is determined, based on the first back pressure and the second back pressure obtained in the previous time period, that the back pressure on the range hood is gradually decreasing and the air volume is less than or equal to a first preset air volume threshold, a third operating frequency adjustment curve is determined from the multiple operating frequency adjustment curves as the target operating frequency adjustment curve for the variable frequency fan; When the air volume is greater than or equal to a second preset air volume threshold, determining a fourth operating frequency adjustment curve from the multiple operating frequency adjustment curves as the target operating frequency adjustment curve of the variable frequency fan; The first preset air volume threshold is smaller than the second preset air volume threshold, and the frequency adjustment speed corresponding to the third operating frequency adjustment curve is smaller than the frequency adjustment speed of the fourth operating frequency adjustment curve.

4. The method according to claim 2 or 3, wherein: The step of determining a target operating frequency adjustment curve for the variable frequency fan from the plurality of operating frequency adjustment curves according to the air volume and the first back pressure further includes: When the air volume is greater than the first preset air volume threshold and less than the second preset air volume threshold, a fifth operating frequency adjustment curve is determined from the multiple operating frequency adjustment curves as the target operating frequency adjustment curve of the variable frequency fan.

5. The method according to claim 4, wherein Before determining the target operating frequency adjustment curve of the variable frequency fan from the multiple operating frequency adjustment curves according to the air volume and the first back pressure, the method further includes: The first preset air volume threshold and the second preset air volume threshold are determined according to the first back pressure.

6. The method according to claim 5, wherein The back pressure intervals include a high back pressure interval, a medium back pressure interval, and a low back pressure interval. Each back pressure interval is associated with a plurality of operating frequency adjustment curves, wherein: The first operating frequency adjustment curves associated with different back pressure intervals are different; or, The second operating frequency adjustment curves associated with different back pressure intervals are different; or, The third operating frequency curves associated with different back pressure intervals are different; or, The third operating frequency curves associated with different back pressure intervals are different, or, The fourth operating frequency curves associated with different back pressure intervals are different.

7. The method according to claim 1, wherein After adjusting the operating frequency of the variable frequency fan according to the target operating frequency adjustment curve, the method further includes: When the operating frequency of the variable frequency fan reaches the rated operating frequency, the range hood is controlled to start the flue cleaning function.

8. A variable frequency fan control device for a range hood, characterized in that: The variable frequency fan control device includes: an acquiring unit, configured to acquire a first back pressure to which the range hood is subjected during operation, and to acquire an air volume of a variable frequency fan of the range hood when subjected to the first back pressure; a determination unit, configured to determine a target back pressure interval in which the first back pressure is located from a plurality of preset back pressure intervals, and obtain a plurality of operating frequency adjustment curves associated with the target back pressure interval, wherein the operating frequency adjustment curves are used to adjust the operating frequency of the variable frequency fan; a processing unit, configured to determine a target operating frequency adjustment curve for the variable frequency fan from the plurality of operating frequency adjustment curves according to the air volume and the first back pressure; A control unit is used to adjust the operating frequency of the variable frequency fan according to the target operating frequency adjustment curve.

9. A range hood, characterized in that: The range hood comprises: a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other via the communication bus; The memory is used to store at least one executable instruction, and the executable instruction enables the processor to execute the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, which is used to implement the method according to any one of claims 1 to 7 when executed by a processor.

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