A vibration reduction control method for a range hood and a range hood

Abstract

The application relates to a kind of range hood vibration reduction control method and range hood, vibration reduction control method includes: drawing grid chart in the plane where volute front cover plate is, the grid point in the grid chart in the projection of front cover plate is as distributed point, the length of square in the grid chart and the number of vibration actuator are adjusted multiple times simultaneously, and the number of distributed points and the number of vibration actuator are adjusted according to each time, and work, the number of distributed points and the working condition of vibration actuator after R adjustment are measured respectively, find the number of distributed points and the number of vibration actuator that meet the noise target condition, and select the minimum value of the number of vibration actuator as the final number of vibration actuator;Finally, the final number of vibration actuator is installed on the corresponding distributed point, and works according to control vibration actuator.The method can reduce the vibration reduction cost to the maximum extent while realizing the vibration reduction of each distributed point on the volute.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of range hood, and particularly relates to a range hood vibration reduction control method and a range hood. BACKGROUND

[0002] The range hood is a kitchen product for purifying the kitchen environment. The range hood works by using the principle of fluid dynamics, and absorbs and discharges the oil fume through the centrifugal fan installed in the range hood. The centrifugal fan includes a volute, an impeller installed in the volute, and a motor driving the impeller to rotate. When the impeller rotates, a negative pressure suction is generated at the center of the fan, and the oil fume below the range hood is sucked into the fan, accelerated by the fan, and then collected and guided by the volute to be discharged outdoors.

[0003] During the operation of the range hood, after the motor is powered on, the rotation of the impeller in the volute driven by the motor causes the operation of the motor and the vibration of the volute to generate noise, affecting the user's experience. There are many methods to reduce the vibration of the motor in the prior art, for example, the Chinese utility model patent with the patent number ZL202223356433.X (the authorized announcement number CN219062031U) discloses a volute structure and a range hood, the volute is provided with a damping vibration material in the vibration isolation plate, which reduces the vibration transmission of the volute structure during the use of the fan, thereby reducing the noise of the range hood during use. For another example, the Chinese invention patent with the application number CN202111387690.7 (the application publication number CN113864249A) discloses a vibration reduction and noise reduction device, a fan and a range hood, when the fan works, the extension and contraction deformation of the elastic buffer can prolong the vibration transmission time to reduce the impact force generated by the vibration, and then under the combined action of the damping effect of the damping plate and the elastic buffer, the vibration of the fan can be more effectively relieved, and the working noise of the fan can be reduced.

[0004] Although the above range hood can achieve a certain vibration reduction and noise reduction effect, the noise reduction method in the prior art usually reduces the vibration transmission of the volute structure through external structure to relieve the vibration of the fan, and cannot realize the distributed vibration reduction control of the vibration structure of the range hood in the whole speed condition, and the vibration reduction device in the prior art has high cost. Therefore, the prior art needs to be further improved. SUMMARY

[0005] The first technical problem to be solved by the present application is to provide a range hood vibration reduction control method which can realize distributed vibration reduction of the volute, improve the vibration reduction effect, and minimize the vibration reduction cost, aiming at the above-mentioned prior art.

[0006] The second technical problem to be solved by the present application is to provide a range hood applying the above-mentioned range hood vibration reduction control method.

[0007] The technical scheme adopted by the present application to solve the first technical problem is as follows: a vibration reduction control method for an extractor hood, the extractor hood comprising a casing and a fan system installed in the casing, the fan system comprising a volute, an impeller arranged in the volute, and a motor driving the impeller to rotate, the volute comprising a front cover plate and a rear cover plate arranged at intervals, the rear cover plate being provided with a support, the support being provided with N motor mounting points, N being a positive integer; characterized in that the support is further provided with M acceleration sensors and at least one vibration actuator, M being a positive integer.

[0008] The vibration reduction control method for the extractor hood comprises the following steps:

[0009] S1. Drawing i horizontal lines and j vertical lines in the plane of the front cover plate of the volute at equal intervals, i and j being positive integers, to form a grid pattern, the grid pattern having (i-1)*(j-1) squares with a side length of L, and the outer contour of the front cover plate being in the grid pattern, and taking the square points in the grid pattern that are in the projection of the front cover plate as distributed points;

[0010] S2. Simultaneously adjusting the side length of the square in the grid pattern and the number of vibration actuators for R times, the number of distributed points in the grid pattern after the rth adjustment being Kr, and the vibration actuator after the rth adjustment being Sr; r being 1, 2, … R in turn;

[0011] S3. During the operation of the extractor hood, the number of distributed points and the vibration actuators after the 1st, 2nd, … Rth adjustment are respectively subjected to the following operations;

[0012] The control logic of the number of distributed points and the vibration actuators after the rth adjustment comprises the following steps:

[0013] S3-1. Successively taking n = 1, 2, … N, and m = 1, 2, … M, to obtain the acceleration transfer function H Fn-Am (ω) from the nth motor mounting point to the mth acceleration sensor;

[0014] S3-2. Successively taking n = 1, 2, … N, and k0 = 1, 2, … Kr, to obtain the first displacement transfer function

[0015] S3-3. Successively taking s = 1, 2, … Sr, and k0 = 1, 2, … Kr, to obtain the second displacement transfer function

[0016] S3-4、in the working process of the range hood, obtaining the data measured by all acceleration sensors, and calculating the exciting force of each motor mounting point according to the data measured by all acceleration sensors and the acceleration transfer function in S3-1;

[0017] S3-5、calculating the displacement of each distributed point according to the exciting force of each motor mounting point in S3-4 and the first displacement transfer function in S3-2;

[0018] S3-6、calculating the exciting output of each vibration actuator according to the displacement of each distributed point in S3-5 and the second displacement transfer function in S3-3;

[0019] S3-7、performing Fourier inverse transform on the exciting output of each vibration actuator in S3-6 to generate a fixed time domain signal, and outputting the time domain signal to the vibration actuator to control the vibration actuator to start working;

[0020] S4、measuring the noise of the distributed points and the working conditions of the vibration actuators after the first, second, …, Rth adjustment, finding the number of distributed points and the number of vibration actuators that meet the noise target condition, and selecting the minimum value of the number of vibration actuators as the final number of vibration actuators;

[0021] S5、installing the vibration actuators with the final number in S4 on the corresponding distributed points, and controlling the vibration actuators to work in the same way as in S3.

[0022] To ensure that the exciting force of the motor mounting point has a solution, the condition between M and N is: M≥N.

[0023] To reduce the cost, the number of vibration actuators adjusted each time in S2 is less than the number of distributed points.

[0024] To make the square grid length adjustment regular, and to find the optimal length faster, the adjustment method of the square grid length in the square grid in S2 is:

[0025] The square grid length L in the square grid is adjusted once within the interval (L-ΔL L+ΔL) with a length adjustment step dL;

[0026] Wherein, ΔL is the allowable error length of the square grid length in the square grid.

[0027] To make the vibration actuator number adjustment regular, and to find the optimal number of vibration actuators faster, the adjustment method of the vibration actuator in S2 is:

[0028] The number of vibration actuators is adjusted once within the interval (s-Δs s+Δs) with a number adjustment step ds;

[0029] Wherein s is the initial number of vibration actuators, and Δs is the allowed error number of vibration actuators.

[0030] In order to realize the calculation of the exciting force, the calculation formula of the exciting force of each motor mounting point in S3-4 is:

[0031]

[0032] Wherein, F1(w) is the exciting force of the first motor mounting point, F2(w) is the exciting force of the second motor mounting point, F N (w) is the exciting force of the Nth motor mounting point, A1(w) is the data measured by the first acceleration sensor, A2(w) is the data measured by the second acceleration sensor, A M (w) is the data measured by the Mth acceleration sensor.

[0033] In order to realize the displacement calculation of the distributed point, the displacement calculation formula of each distributed point in S3-5 is:

[0034]

[0035] Wherein, D1(w) is the displacement of the first distributed point, D2(w) is the displacement of the second distributed point, D Kr (w) is the displacement of the Krth distributed point.

[0036] In order to realize the excitation output calculation of the vibration actuator, the excitation output calculation formula of each vibration actuator in S3-6 is:

[0037]

[0038] Wherein, E1(w) is the excitation output of the first vibration actuator, E2(w) is the excitation output of the second vibration actuator, E Sr (w) is the excitation output of the Srth vibration actuator.

[0039] In order to realize the optimal noise reduction effect, the specific way of noise measurement of the distributed point number and the working condition of the vibration actuator after the rth adjustment in S4 is:

[0040] S4-1, select Q motor speed working points, Q is a positive integer, and test the noise value of each motor speed working point;

[0041] S4-2, the initial value of q is 1;

[0042] S4-3, judge whether the noise measurement value P q of the qth motor speed working point is less than or equal to the target value noise target value T qIf so, proceed to S4-4; otherwise, the number of distributed points and the operating conditions of the vibration actuator after the r-th adjustment do not meet the noise target conditions, and the process ends.

[0043] S4-4. Determine if q is Q. If so, the number of distributed points after the r-th adjustment and the working condition of the vibration actuator meet the noise target condition. If not, add 1 to the value of q and update the value of q, then go to S4-3.

[0044] The technical solution adopted by the present invention to solve the second technical problem mentioned above is: a range hood, characterized in that: the range hood vibration reduction method described above is applied.

[0045] Compared with the prior art, the advantages of the present invention are as follows: by drawing a grid pattern on the plane of the front cover plate of the volute to form distributed points, and by simultaneously adjusting the side length of the squares in the grid pattern and the number of vibration actuators, vibration reduction can be achieved at each distributed point on the volute, improving the overall vibration reduction effect of the volute, while minimizing the number of vibration actuators to reduce vibration reduction costs. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the fan system in an embodiment of the present invention;

[0047] Figure 2 This is a schematic diagram of a grid diagram in an embodiment of the present invention. Detailed Implementation

[0048] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0049] like Figure 1 As shown, the range hood in this embodiment includes a housing and a fan system installed inside the housing. The fan system includes a volute 1, an impeller 2 disposed inside the volute 1, and a motor 3 that drives the impeller 2 to rotate. The volute 1 includes a front cover plate 11 and a rear cover plate 12 spaced apart. A bracket 13 is provided on the rear cover plate 12, and N motor mounting points 131 are provided on the bracket 13. Figure 1 There are 4 motor mounting points 131 in the middle. M acceleration sensors (not shown in the figure) and at least one vibration actuator (not shown in the figure) are also mounted on bracket 13, where N and M are both positive integers. This range hood uses the following vibration reduction control method for vibration reduction, where M and N satisfy the condition: M ≥ N.

[0050] The support 13 in the embodiment includes two strip-shaped support plates 132 arranged side by side and spaced apart, and at least two support frames 133 corresponding to the two strip-shaped support plates 132 respectively. Each strip-shaped support plate 132 is connected to two opposite sides of the outer circumferential surface of the motor 3 respectively. Each support frame 133 has a first end connected to the volute 1 and a second end for connecting to its corresponding strip-shaped support plate 132. The specific structure of the support 13 can refer to the disclosure in the prior application of the applicant with the patent number ZL 202121503504.7 (the authorized announcement number CN 215521396U).

[0051] In addition, a controller (not shown in the figure) is also installed on the support 13. The controller is electrically connected with all the acceleration sensors and all the vibration actuators. The controller is configured to control the vibration actuators to perform corresponding vibration exciting actions according to the data measured by all the acceleration sensors and the acceleration transfer function, the first displacement transfer function and the second displacement transfer function stored in advance.

[0052] The range hood vibration control method in the embodiment includes the following steps:

[0053] S1, draw i horizontal lines and j vertical lines in the plane of the volute front cover plate, i and j are both positive integers, forming a grid chart, the grid chart has (i-1)*(j-1) squares with a side length of L, and the outer contour of the front cover plate is in the grid chart, and the square points in the projection of the front cover plate are taken as distributed points; the grid chart is specifically as shown in Figure 2 ;

[0054] S2, adjust the side length of the square and the number of vibration actuators simultaneously for R times, the number of distributed points in the grid chart after the rth adjustment is Kr, and the vibration actuators after the rth adjustment is Sr; r is 1, 2, … R in turn;

[0055] In the embodiment, the number of vibration actuators after each adjustment is less than the number of distributed points.

[0056] On the one hand, the adjustment method of the side length of the square in the grid chart is:

[0057] The side length L of the square in the grid chart is adjusted once in the interval (L-ΔL L+ΔL) with a side length adjustment step dL;

[0058] Wherein, ΔL is the allowable error length of the side length of the square in the grid chart; dL is the preset side length adjustment step;

[0059] On the other hand, the adjustment method of the vibration actuators in S2 is:

[0060] The number of the vibration actuators is adjusted once in the interval of (s-Δs s+Δs) with the number adjustment step length ds;

[0061] Wherein s is the initial number of the vibration actuators, Δs is the allowed error number of the vibration actuators; ds is the preset number adjustment step length;

[0062] S3, in the working process of the range hood, and the first, second…R adjusted distributed point number and the vibration actuator are respectively as follows:

[0063] Wherein, the control logic of the first adjusted distributed point number and the vibration actuator is specifically as follows:

[0064] S3-1, make n=1, 2, …N, m=1, 2, …M in turn, and obtain the acceleration transfer function H Fn-Am (ω) from the nth motor mounting point to the mth acceleration sensor;

[0065] S3-2, make n=1, 2, …N, k0=1, 2, …Kr in turn, and obtain the first displacement transfer function

[0066] S3-3, make s=1, 2, …Sr, k0=1, 2, …Kr in turn, and obtain the second displacement transfer function from the sth vibration actuator to the k0th distributed point

[0067] S3-4, in the working process of the range hood, obtain the data measured by all the acceleration sensors, and calculate the exciting force of each motor mounting point according to the data measured by all the acceleration sensors and the acceleration transfer function in S3-1;

[0068] In the embodiment, the calculation formula of the exciting force of each motor mounting point is as follows:

[0069]

[0070] Wherein F1(w) is the exciting force of the first motor mounting point, F2(w) is the exciting force of the second motor mounting point, F N (w) is the exciting force of the Nth motor mounting point, A1(w) is the data measured by the first acceleration sensor, A2(w) is the data measured by the second acceleration sensor, A M (w) is the data measured by the Mth acceleration sensor; To obtain the inverse matrix of ;

[0071] S3-5, calculating the displacement of each distributed point according to the exciting force of each motor mounting point in S3-4 and the first displacement transfer function in S3-2;

[0072] In this embodiment, the displacement calculation formula of each distributed point is:

[0073]

[0074] wherein D1(w) is the displacement of the first distributed point, D2(w) is the displacement of the second distributed point, D Kr (w) is the displacement of the Krth distributed point;

[0075] S3-6, calculating the excitation output of each vibration actuator according to the displacement of each distributed point in S3-5 and the second displacement transfer function in S3-3;

[0076] In this embodiment, the excitation output calculation formula of each vibration actuator is:

[0077]

[0078] wherein E1(w) is the excitation output of the first vibration actuator, E2(w) is the excitation output of the second vibration actuator, E Sr (w) is the excitation output of the Srth vibration actuator;

[0079] S3-7, performing Fourier inverse transform on the excitation output of each vibration actuator in S3-6 to generate a fixed time domain signal, and outputting the time domain signal to the vibration actuator to control the vibration actuator to start working;

[0080] S4, measuring the noise of the distributed point quantity and the working condition of the vibration actuator after the first, second, …, Rth adjustment, finding the distributed point quantity and the vibration actuator quantity that meet the noise target condition, and selecting the minimum value of the vibration actuator quantity as the final number of vibration actuators;

[0081] In this embodiment, the specific way of measuring the noise of the distributed point quantity and the working condition of the vibration actuator after the rth adjustment is:

[0082] S4-1, selecting Q motor speed working points, Q being a positive integer, and testing the noise value of each motor speed working point;

[0083] S4-2, setting the initial value of q as 1;

[0084] S4-3, judging whether the noise measurement value P q of the qth motor speed working point is less than or equal to the target value noise target value T qIf yes, go to S4-4; if no, the number of distributed points and the working condition of the vibration actuators after the rth adjustment do not satisfy the noise target condition, and the process ends;

[0085] S4-4, determine whether q is Q. If yes, the number of distributed points and the working condition of the vibration actuators after the rth adjustment satisfy the noise target condition; if no, update the value of q by adding 1 to the value of q, and go to S4-3;

[0086] S5, install the final number of vibration actuators in S4 on the corresponding distributed points, and control the vibration actuators to work in the same manner as in S3.

[0087] In this embodiment, the number of vibration actuators and the system cost are maximally reduced on the basis of ensuring the noise target.

Claims

1. A vibration reduction control method for a range hood, the range hood comprising a housing and a fan system installed within the housing, the fan system comprising a volute (1), an impeller (2) disposed within the volute (1), and a motor (3) driving the impeller (2) to rotate, the volute (1) comprising a front cover plate (11) and a rear cover plate (12) spaced apart, the rear cover plate (12) being provided with a bracket (13), the bracket (13) being provided with N motor mounting points (131), where N is a positive integer; characterized in that: The bracket (13) is also equipped with M acceleration sensors and at least one vibration actuator, where M is a positive integer; The vibration reduction control method for the range hood includes the following steps: S1. Draw i horizontal lines and j vertical lines at equal intervals on the plane where the front cover plate of the volute is located, where i and j are both positive integers, to form a grid. The grid has (i-1)*(j-1) squares with a side length of L, and the outer contour of the front cover plate is all in the grid. The square points in the grid that are in the projection of the front cover plate are taken as distributed points. S2. Simultaneously adjust the side length of the squares in the grid diagram and the number of vibration actuators R times. The number of distributed points in the grid diagram after the r-th adjustment is Kr, and the number of vibration actuators after the r-th adjustment is Sr; r is 1, 2, ..., R in sequence. The method for adjusting the side length of the squares in a grid diagram is as follows: In the grid diagram, the side length L of the square is adjusted once within the interval (L-ΔL L+ΔL) with a side length adjustment step dL. Where ΔL is the allowable error length of the side length of the square in the grid diagram; The method for adjusting the number of vibration actuators is as follows: The number of vibration actuators is adjusted once within the range of (s-Δs s+Δs) with a quantity adjustment step size ds. Where s is the initial number of vibration actuators, and Δs is the allowable error of the vibration actuators; S3. During the operation of the range hood, the number of distributed points and the vibration actuator after the 1st, 2nd...Rth adjustments are respectively performed as follows; The specific steps of the control logic for the number of distributed points after the r-th adjustment and the vibration actuator are as follows: S3-1. Sequentially set n = 1, 2, ... N, m = 1, 2, ... M, and obtain the acceleration transfer function H from the nth motor mounting point to the mth accelerometer. Fn-Am (ω); S3-2. By sequentially setting n = 1, 2, ... N, and k0 = 1, 2, ... Kr, obtain the first displacement transfer function from the nth motor mounting point to the k0th distributed point. S3-3. Sequentially set s = 1, 2, ..., Sr, k0 = 1, 2, ..., Kr to obtain the second displacement transfer function from the s-th vibration actuator to the k0-th distributed point. S3-4. During the operation of the range hood, acquire the data measured by all acceleration sensors, and calculate the excitation force at each motor mounting point based on the data measured by all acceleration sensors and the acceleration transfer function in S3-1. S3-5. The displacement of each distributed point is calculated based on the excitation force of each motor mounting point in S3-4 and the first displacement transfer function in S3-2. S3-6. Calculate the excitation output of each vibration actuator based on the displacement of each distributed point in S3-5 and the second displacement transfer function in S3-3. S3-7. Perform an inverse Fourier transform on the excitation output of each vibration actuator in S3-6 to generate a fixed time-domain signal, and output the time-domain signal to the vibration actuator to control the vibration actuator to start working. S4. After adjusting the number of distributed points and the working condition of the vibration actuators for the first, second...Rth times, perform noise measurements to find the number of distributed points and the number of vibration actuators that meet the noise target conditions, and select the value with the smallest number of vibration actuators as the final number of vibration actuators. S5. Install the final number of vibration actuators from S4 at the corresponding distributed points, and control the vibration actuators to work in the same way as in S3.

2. The vibration reduction control method for a range hood according to claim 1, characterized in that: The condition that M and N satisfy is: M≥N.

3. The vibration reduction control method for a range hood according to claim 1, characterized in that: In S2, the number of vibration actuators after each adjustment is less than the number of distributed points.

4. The vibration reduction control method for a range hood according to claim 3, characterized in that: The formula for calculating the excitation force at each motor mounting point in S3-4 is as follows: Where F1(w) is the excitation force at the first motor mounting point, and F2(w) is the excitation force at the second motor mounting point. N (w) represents the excitation force at the Nth motor mounting point, A1(w) represents the data measured by the first acceleration sensor, and A2(w) represents the data measured by the second acceleration sensor. M (w) represents the data measured by the Mth accelerometer.

5. The vibration reduction control method for a range hood according to claim 4, characterized in that: The displacement calculation formula for each distributed point in S3-5 is as follows: Where D1(w) is the displacement of the first distributed point, D2(w) is the displacement of the second distributed point, and D... Kr (w) represents the displacement of the Kr-th distributed point.

6. The vibration reduction control method for a range hood according to claim 5, characterized in that: The excitation output calculation formula for each vibration actuator in S3-6 is as follows: Where E1(w) is the excitation output of the first vibration actuator, E2(w) is the excitation output of the second vibration actuator, and E Sr (w) is the excitation output of the Sr-th vibration actuator.

7. The vibration reduction control method for a range hood according to any one of claims 1 to 6, characterized in that: The specific method for measuring noise based on the number of distributed points after the r-th adjustment in S4 and the operating condition of the vibration actuator is as follows: S4-1. Select Q motor speed operating points, where Q is a positive integer, and test the noise value of each motor speed operating point. S4-2. Initialize the value of q to 1; S4-3. Determine the noise measurement value P at the qth motor speed operating point. q Is it less than or equal to the target value T corresponding to the qth motor speed operating point? q If so, proceed to S4-4; otherwise, the number of distributed points and the operating conditions of the vibration actuator after the r-th adjustment do not meet the noise target conditions, and the process ends. S4-4. Determine if q is Q. If so, the number of distributed points after the r-th adjustment and the working condition of the vibration actuator meet the noise target condition. If not, add 1 to the value of q and update the value of q, then go to S4-3.

8. A range hood, characterized in that: The application is the vibration reduction method for range hoods as described in any one of claims 1 to 7.

Images