Control method and control device of range hood and range hood

Abstract

The invention relates to the technical field of range hoods, particularly provides a control method and device of a range hood and the range hood, and aims to solve the problem of how to evaluate the advantages and disadvantages between air volume increase and noise increase. The range hood provided by the invention comprises a fan. The provided control method comprises the following steps: adapting a rotating speed adjusting strategy for the fan; the corresponding first air volume of the range hood before rotating speed adjustment is obtained, the corresponding second air volume after rotating speed adjustment is estimated based on the adjustment strategy, and the air volume change rate is obtained through calculation; on the basis of the adjustment strategy, noise variation of noise before and after rotation speed adjustment during operation of the range hood is estimated, and the ratio of the air volume change rate to the noise variation is calculated; and comparing the ratio with a preset ratio, and selectively executing an adjustment strategy according to a comparison result. According to the method, the air volume income and noise damage caused by rotation speed increase can be evaluated before the rotation speed of the fan is adjusted, and effective balance between the smoke exhaust effect of the range hood and noise control is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of range hoods, and specifically provides a range hood control method, a control device and a range hood. Background Art

[0002] With the increasing use of constant air volume technology, when the range hood is running under high back pressure conditions, in order to maintain a constant air volume, it is usually necessary to significantly increase the speed. However, this practice is often accompanied by a significant increase in noise, while the actual increase in air volume is not always significant, which has an adverse impact on the user experience.

[0003] In view of this, there is an urgent need for a method that can effectively evaluate the pros and cons between increased air volume and increased noise to solve the above problems. Summary of the invention

[0004] The present invention aims to solve the above technical problem, that is, at least to solve the problem of how to evaluate the pros and cons between increased air volume and increased noise.

[0005] In a first aspect, the present invention provides a control method for a range hood, wherein the range hood includes a fan, and the control method includes: an adjustment strategy for adapting a rotation speed to the fan; obtaining a first air volume corresponding to the range hood before the rotation speed is adjusted, and estimating a second air volume corresponding to the rotation speed after the rotation speed is adjusted based on the adjustment strategy, and calculating the air volume change rate; based on the adjustment strategy, estimating a noise change during operation of the range hood before and after the rotation speed is adjusted, and calculating a 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.

[0006] The present invention can evaluate the air volume gain and noise damage brought by increasing the speed before adjusting the fan speed, and weigh the pros and cons according to the degree of air volume gain and noise damage, so as to determine whether it is necessary to execute the adjustment strategy. Only when the positive benefits brought by the increase in air volume outweigh the negative impact of the increase in noise will the adjustment strategy be executed, thereby achieving an effective balance between the range hood exhaust effect and noise control, thereby effectively improving the user experience.

[0007] In some feasible implementations of the above-mentioned control method for a range hood, the “selectively executing the adjustment strategy according to the comparison result” includes:

[0008] If the ratio is greater than or equal to the preset ratio, executing the adjustment strategy; or

[0009] If the ratio is less than, equal to or less than the preset ratio, the adjustment strategy is not executed.

[0010] It can be understood that by comparing the ratio of the air volume change rate to the noise change with the preset ratio, it can be ensured that while the exhaust capacity of the range hood is effectively enhanced, the noise will not be increased too much, so there is no need to sacrifice the auditory experience for the air volume. While improving the kitchen air quality, the user experience is also guaranteed.

[0011] In some feasible implementations of the above-mentioned control method for range hoods, before adapting the speed adjustment strategy for the fan, the control method also includes: obtaining the external impedance of the range hood, comparing the external impedance with a preset impedance threshold, and selectively correcting the adjustment strategy based on the comparison result.

[0012] It is understandable that changes in external impedance will directly affect the exhaust effect and noise level of the range hood, so using it as a reference factor for adjusting the speed can improve the accuracy of the adjustment strategy.

[0013] In some feasible implementations of the above-mentioned control method for range hoods, the “selectively correcting the adjustment strategy according to the comparison result” includes:

[0014] If the external impedance is less than or equal to the preset impedance threshold, then the adjustment strategy is not corrected; or

[0015] If the external impedance is greater than, equal to, or greater than the preset impedance threshold, the speed adjustment amount in the adjustment strategy is increased.

[0016] It should be noted that when the external impedance is lower than or does not exceed the preset impedance threshold, the external smoke exhaust effect of the range hood is relatively good, and the noise generated when the range hood is working is also within the acceptable range for users, so there is no need for additional correction of the adjustment strategy; when the external impedance is not lower than or higher than the preset impedance threshold, it means that the range hood needs greater power, that is, to increase the speed of the fan to overcome resistance and maintain an effective exhaust effect, so it is necessary to make additional corrections to the speed adjustment amount in the adjustment strategy.

[0017] In some feasible implementations of the above-mentioned control method for range hoods, the process of obtaining the external impedance of the range hood includes: obtaining the real-time air volume of the range hood; determining the outlet static pressure of the range hood based on the real-time air volume and a preset static pressure-air volume relationship model; and calculating and obtaining the external impedance based on the outlet static pressure and the real-time air volume.

[0018] In some feasible implementations of the above-mentioned control method for range hood, the calculation formula of the external impedance is:

[0019] S=P / Q 2

[0020] Among them, S is the external impedance of the range hood; P is the outlet static pressure of the range hood; Q is the real-time air volume of the range hood.

[0021] In some feasible implementations of the above-mentioned control method for range hoods, the preset static pressure-air volume relationship model is a set of static pressure-air volume relationship curves corresponding to a plurality of fan speeds.

[0022] In some feasible implementations of the above-mentioned control method for range hoods, the “estimated noise change amount of the range hood during operation before and after the speed adjustment” is calculated by the following formula:

[0023]

[0024] Where ΔL is the noise change; n a is the first speed of the fan before speed adjustment; n b is the second speed of the fan after the speed estimation adjustment; m is the proportional constant.

[0025] In a second aspect, the present invention further provides a control device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the range hood control method in any of the aforementioned technical solutions through the computer program.

[0026] In a third aspect, the present invention further provides a range hood, comprising the aforementioned control device.

[0027] Those skilled in the art will appreciate that, since the range hood and the control device can execute the control method in any of the aforementioned technical solutions, they possess all the technical effects that can be obtained by the aforementioned control methods, which will not be elaborated herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0029] Figure 1 A flowchart of a range hood control method provided in Embodiment 1 of the present invention;

[0030] Figure 2 A schematic diagram of a preset static pressure-air volume relationship model provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not used to limit the scope of protection of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific applications. In order to better illustrate the present invention, numerous specific details are given in the specific embodiments below. It should be understood by those skilled in the art that the present invention can also be implemented without certain specific details.

[0032] A range hood, also known as an exhaust hood or a range hood, generally includes a smoke hood and a drive mechanism, and the drive mechanism usually uses a fan. When the range hood is in operation, the power of the range hood is turned on, the motor is started to drive the fan wheel to rotate, and then the smoke is sucked into the smoke duct of the range hood under the driving action of the fan, and then discharged to the outside along the smoke duct.

[0033] Example 1

[0034] like Figure 1 As shown, Figure 1 1 is a flow chart 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 comprises:

[0035] S1, is the adjustment strategy for the fan speed adaptation.

[0036] Specifically, by measuring and analyzing some data of the range hood, a corresponding speed adjustment strategy can be adapted for the fan; or, through multiple experimental tests, a unified initial speed adjustment strategy can be preset for the fan.

[0037] In one embodiment, the speed adjustment strategy is to increase the speed of the fan, 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.

[0038] S2. Obtain a first air volume corresponding to the range hood before the speed is adjusted, estimate a second air volume corresponding to the speed after the speed is adjusted based on the adjustment strategy, and calculate the air volume change rate.

[0039] Specifically, the current air volume of the range hood (i.e., the first air volume) can be calculated by a conventional constant air volume algorithm, or by adding an air volume sensor to measure the current air volume of the range hood. The second air volume can be directly read in the adjustment strategy, and then the difference between the second air volume and the first air volume is calculated, and then the air volume change rate is calculated by calculating the ratio of the difference to the first air volume.

[0040] S3. Based on the adjustment strategy, estimate the noise change of the range hood before and after the speed adjustment, and calculate the ratio of the air volume change rate to the noise change.

[0041] Furthermore, in order to more quickly obtain the noise change of the range hood before and after the speed adjustment during operation, the real-time speed of the fan (defined as the first speed) can be measured and the estimated adjusted 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 based on the estimation formula of the sound power level of similar fans.

[0042] Specifically, the estimated noise change of the range hood during operation before and after the speed adjustment is calculated using the following formula:

[0043]

[0044] Where ΔL is the noise change in dB; n a The first speed of the fan before speed adjustment, in rpm; n b It is the second speed of the fan after the speed estimation adjustment, in rpm; m is the proportional constant.

[0045] It should be noted that the proportional constant m reflects the quantitative relationship between the change in sound power level and the change in speed ratio. It means that for every 1 dB change in sound power level, the logarithm of the corresponding speed ratio multiplied by m is equal to the change in sound power level. In other words, m is the proportional coefficient in the formula, and the value of m is based on experimental data or empirical formulas. For example, m can be 50.

[0046] S4. Compare the ratio with a preset ratio, and selectively execute an adjustment strategy based on the comparison result.

[0047] It is understandable that by comparing the ratio of the air volume change rate to the noise change with the preset ratio, it can be ensured that the noise will not be increased too much while the exhaust capacity of the range hood is effectively enhanced, so that the auditory experience does not have to be sacrificed for the air volume. Only when the positive benefits of the air volume increase outweigh the negative impact of the noise increase will the adjustment strategy be implemented, so that the balance between the performance and noise of the range hood can be adjusted, while improving the kitchen air quality, it also ensures the user experience.

[0048] Among them, the specific value of the preset ratio is the result of comprehensive consideration of experimental data analysis, user expectations for noise comfort and actual application conditions. By setting a reasonable preset ratio, it can be ensured that the range hood maintains a low noise level while providing sufficient air volume, thereby improving the user experience. For example, the preset ratio can be 5%.

[0049] Further, according to the comparison result between the ratio and the preset ratio, the adjustment strategy is selectively executed. In other words, according to the comparison between the ratio and the preset ratio, the adjustment strategy can be selected to be executed or not executed, specifically including:

[0050] S31. If the ratio is greater than or equal to a preset ratio, an adjustment strategy is executed.

[0051] When the ratio of the air volume change rate to the noise change is greater than or not lower than the preset ratio, the speed is increased to make the fan work in a more efficient range. Although the noise increases, the effect of increasing the air volume is significantly better. At this time, executing the adjustment strategy can significantly improve the exhaust capacity of the range hood, thereby more effectively removing fumes and odors in the kitchen. In particular, for scenarios where a large amount of fumes need to be removed quickly, users may be more willing to accept a certain degree of noise increase in exchange for better exhaust effects.

[0052] S32: If the ratio is less than or equal to or less than the preset ratio, the adjustment strategy is not executed.

[0053] When the ratio of the air volume change rate to the noise change is not higher than or lower than the preset ratio, not executing the adjustment strategy can avoid unnecessary noise increase and keep the kitchen environment quiet and comfortable. For users who pursue a quiet kitchen environment, not executing the adjustment strategy can maintain the noise level they expect, thereby improving the user experience.

[0054] Specifically, the following specific application scenarios can be used to determine whether to execute or not execute the adjustment strategy: If the standard air volume set at the time of the range hood is 12.6m 3 / min, the standard external flue resistance is Ss. In this case, if the speed remains unchanged, when the external flue resistance is greater than Ss, the actual air volume will be less than 12.6m 3 / min, otherwise the actual air volume will be greater than 12.6m 3 / min. Therefore, in order to keep the air volume constant at 12.6m 3 / min, the speed needs to be adjusted to maintain a constant air volume of 12.6m 3 / min. Of course, in some application scenarios, if the actual air volume is greater than 12.6m 3 / min, which is more conducive to removing oil smoke, and you can choose not to change the fan speed.

[0055] See also Figure 2 , if the current air volume of the range hood (i.e., the first air volume) and the corresponding second air volume after the adjustment strategy estimates the speed adjustment are point a and point b in the figure respectively, in other words, in the adjustment strategy, the working point needs to be changed from Figure 2 Point a in the Figure 2 At point b in the figure, the first air volume is 11.6m 3 / min, less than the second air volume 12.6m 3 / min, so the speed needs to be increased. As shown in the figure, the speed needs to be increased from 1100rpm to 1200rpm.

[0056] However, as the speed increases, the noise will increase accordingly. There are two situations. Situation 1: After the speed increases, the air volume increases significantly, and the noise increases slightly, indicating that the positive benefits brought by the increase in air volume outweigh the negative impact of the increase in noise. At this time, you can choose to execute the current adjustment strategy. Situation 2: After the speed increases, the air volume increases slightly, and the noise increases significantly. This means that the positive benefits brought by the increase in air volume are obviously less than the negative impact of the increase in noise. At this time, choose not to execute the current adjustment strategy.

[0057] In summary, the present invention can evaluate the air volume gain and noise damage brought by increasing the speed before adjusting the fan speed, and weigh the pros and cons according to the degree of air volume gain and noise damage, so as to determine whether it is necessary to execute the adjustment strategy. Only when the positive benefits brought by the increase in air volume outweigh the negative impact of the increase in noise will the adjustment strategy be chosen to be executed. In this way, while helping to increase the air volume, the noise growth can also be controlled within the range acceptable to users, achieving an effective balance between the range hood exhaust effect and noise control, thereby effectively improving the user experience.

[0058] Example 2

[0059] In order to improve the accuracy of the adjustment strategy, before the adjustment strategy of the speed is adapted for the fan, the control method provided by the present invention further includes:

[0060] The external impedance of the range hood is obtained, the external impedance is compared with a preset impedance threshold, and the adjustment strategy is selectively corrected according to the comparison result.

[0061] It is understandable that changes in external impedance will directly affect the exhaust effect and noise level of the range hood, so using it as a reference factor for adjusting the speed can improve the accuracy of the adjustment strategy. In this case, selectively correcting the adjustment strategy based on the size relationship between the external impedance and the preset impedance threshold can ensure that the fan speed estimated in the adjustment strategy is more accurate and reasonable, avoiding the need to adjust the fan speed multiple times in the future, which not only affects the exhaust efficiency, but also affects the stability of the system.

[0062] Further, according to the comparison result between the external impedance and the preset impedance threshold, the adjustment strategy is selectively corrected. In other words, according to the comparison between the external impedance and the preset impedance threshold, the adjustment strategy may be corrected or not, specifically including:

[0063] If the external impedance is less than or equal to the preset impedance threshold, no correction is performed on the adjustment strategy.

[0064] When the external impedance is lower than or does not exceed the preset impedance threshold, the external smoke exhaust effect of the range hood is relatively good, and the noise generated when the range hood is working is also within the acceptable range for users, so there is no need for additional correction of the adjustment strategy.

[0065] If the external impedance is greater than or equal to or greater than the preset impedance threshold, the speed adjustment amount in the adjustment strategy is increased.

[0066] When the external impedance is not lower than or higher than the preset impedance threshold, it means that the range hood needs more power, that is, to increase the speed of the fan to overcome the resistance and maintain an effective exhaust effect. Therefore, additional correction is required for the speed adjustment amount in the adjustment strategy.

[0067] Furthermore, the process of obtaining the preset impedance threshold includes: obtaining the real-time noise value when the range hood is working, blocking the exhaust port of the range hood, and adjusting the back pressure of the range hood until the real-time noise value reaches the preset noise threshold, then calculating the external impedance of the range hood at this time and using it as the preset impedance threshold.

[0068] It is understandable that in the process of obtaining the preset impedance threshold, by adjusting the back pressure and observing the change of the real-time noise value, the balance point between the range hood performance and the noise can be found. When the real-time noise value reaches the preset noise threshold, the external impedance at this time is used as the preset impedance threshold, which can be used as a reasonable threshold for controlling the noise level of the range hood while ensuring that the range hood has a certain exhaust capacity.

[0069] Among them, the value of the preset noise threshold can be selected according to actual conditions. For example, the preset noise threshold can be 65dB. When the noise of the range hood reaches 65dB when working, 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, it is considered that the noise of the range hood when working is greater than 65dB.

[0070] Furthermore, the process of obtaining the external impedance of the range hood includes: obtaining the real-time air volume of the range hood, then determining the outlet static pressure of the range hood based on the real-time air volume and a preset static pressure-air volume relationship model, and finally calculating the external impedance based on the outlet static pressure and the real-time air volume.

[0071] Specifically, the external impedance is calculated as:

[0072] S=P / Q 2

[0073] Among them, S is the external impedance of the range hood; P is the outlet static pressure of the range hood, in Pa; Q is the real-time air volume of the range hood, in m 3 / min.

[0074] For further information, see Figure 2 The preset static pressure-air volume relationship model is a collection of static pressure-air volume relationship curves (i.e., PQ relationship curves) corresponding to multiple fan speeds. The model covers static pressure-air volume relationship curves under multiple fan speeds, which means that no matter what speed state the range hood fan is in, the corresponding static pressure-air volume relationship can be found, thereby improving the accuracy and applicability of the model. The static pressure-air volume relationship curve in the model helps to control the range hood while reducing noise and maintaining the range hood's exhaust efficiency.

[0075] In addition, a set of static pressure-air volume relationship curves corresponding to multiple external impedances can be added to the static pressure-air volume relationship model, which can enrich the data set of the model and enable the model to more comprehensively reflect the performance of the range hood under different impedance conditions. This helps to improve the accuracy and reliability of the model and make the model closer to the actual situation when predicting and evaluating the performance of the range hood. It should be noted that if Figure 2 As shown, the value of the external impedance S in the figure can be 2.2, 2.6 and 3.8, the value of the fan speed V can be 1100rpm, 1200rpm and 1300rpm, and other values ​​are no longer shown one by one in the figure.

[0076] It should be noted that the numerical values ​​in the above examples are merely exemplary and should not limit the scope of protection of the present invention. In addition, when establishing a static pressure-air volume relationship model, different fan speeds can be selected for the range hood for experimental testing to obtain multiple sets of data on the static pressure and air volume of the range hood at different fan speeds, and a static pressure-air volume relationship curve of the range hood at different fan speeds can be constructed based on the above data.

[0077] In a specific implementation of establishing a static pressure-air volume relationship model, the fan speed range is 400rpm to 1500rpm. When conducting experimental tests, the fan speed can be an integer speed, and the interval of the integer speed is 100rpm. Through actual measurement, multiple sets of data on the static pressure and air volume of the range hood at different fan speeds are obtained, and the static pressure-air volume characteristic curve of the range hood is plotted. On this basis, other intermediate speeds can be taken as the average of two adjacent integer speed curves. The specific calculation formula is as follows:

[0078]

[0079] Among them, n, n1, and n2 are the fan speeds at a certain value, and the speed n1 and the speed n2 are two adjacent integer speeds of the speed n in the static pressure-air volume relationship model, and n2 is greater than n1, q n (P) is the air volume of the range hood when the speed is n and the outlet static pressure is P, the unit is m3 / min, It is the air volume of the range hood when the speed is n1 and the outlet static pressure is P. It is the air volume of the range hood when the speed is n2 and the outlet static pressure is P.

[0080] The present invention also provides a control device, which includes a memory and a processor. The memory stores a computer program, and the processor is configured to execute the range hood control method in any of the above-mentioned technical solutions through the computer program.

[0081] The present invention also provides a range hood, which comprises the aforementioned control device.

[0082] In the description of the present invention, "processor" may include hardware, software or a combination of the two. The processor may be a central processing unit, a microprocessor, an image processor, a digital signal processor or any other suitable processor. The processor has data and / or signal processing functions. The processor may be implemented in software, hardware or a combination of the two. Non-temporary computer-readable storage media include any suitable medium that can store program code, such as a disk, a hard disk, an optical disk, a flash memory, a read-only memory, a random access memory, etc.

[0083] It is understood by those skilled in the art that all or part of the processes in the method for implementing the above-mentioned embodiments of the present invention may also be completed by hardware related to computer program instructions, and the computer program may be stored in a computer-readable storage medium, and the computer program, when executed by a processor, may implement the steps of the above-mentioned various method embodiments. Among them, the computer program includes computer program code, and the computer program code may be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable storage medium may include: any entity or device, medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electric carrier signal, telecommunication signal and software distribution medium, etc., which can carry the computer program code.

[0084] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle 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 these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A method for controlling a range hood, characterized in that: The range hood includes a fan, and the control method includes: An adjustment strategy for adapting the speed of the fan; Obtaining a first air volume corresponding to the range hood before the speed is adjusted, estimating a second air volume corresponding to the speed after the adjustment based on the adjustment strategy, and calculating the air volume change rate; Based on the adjustment strategy, the noise change amount of the range hood during operation before and after the speed adjustment is estimated, and the ratio of the air volume change rate to the noise change amount is calculated; The ratio is compared with a preset ratio, and the adjustment strategy is selectively executed according to the comparison result.

2. The control method of the range hood according to claim 1, characterized in that: The “selectively executing the adjustment strategy according to the comparison result” includes: If the ratio is greater than or equal to the preset ratio, executing the adjustment strategy; or If the ratio is less than, equal to or less than the preset ratio, the adjustment strategy is not executed.

3. The control method of the range hood according to claim 1, characterized in that: Before adapting the speed adjustment strategy for the fan, the control method further includes: The external impedance of the range hood is obtained, the external impedance is compared with a preset impedance threshold, and the adjustment strategy is selectively corrected according to the comparison result.

4. The control method of the range hood according to claim 3, characterized in that: The “selectively correcting the adjustment strategy according to the comparison result” includes: If the external impedance is less than or equal to the preset impedance threshold, then the adjustment strategy is not corrected; or If the external impedance is greater than, equal to, or greater than the preset impedance threshold, the speed adjustment amount in the adjustment strategy is increased.

5. The control method of the range hood according to claim 3 or 4, characterized in that: The process of obtaining the external impedance of the range hood includes: Obtaining the real-time air volume of the range hood; Determining the outlet static pressure of the range hood based on the real-time air volume and a preset static pressure-air volume relationship model; The external impedance is calculated based on the outlet static pressure and the real-time air volume.

6. The control method of the range hood according to claim 5, characterized in that: The calculation formula of the external impedance is: S=P / Q 2 Among them, S is the external impedance of the range hood; P is the outlet static pressure of the range hood; Q is the real-time air volume of the range hood.

7. The control method of the range hood according to claim 5, characterized in that: The preset static pressure-air volume relationship model is a collection of static pressure-air volume relationship curves corresponding to multiple fan speeds.

8. The control method of the range hood according to claim 1, characterized in that: The "estimated noise change amount of the range hood during operation before and after the speed adjustment" is calculated by the following formula: Where ΔL is the noise change; n a is the first speed of the fan before speed adjustment; n b is the second speed of the fan after the speed estimation adjustment; m is the proportional constant.

9. A control device, characterized in that: The control device comprises a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to execute the range hood control method according to any one of claims 1 to 8 through the computer program.

10. A range hood, characterized in that: The range hood comprises the control device according to claim 9.

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