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: in the plane of volute front cover plate draw square grid, the square grid point in the projection of front cover plate is as distributed point, according to the data measured by all acceleration sensors and acceleration transfer function, the exciting force of each motor mounting point is calculated, and according to the exciting force and the first displacement transfer function of each motor mounting point to each distributed point, the displacement of each distributed point is calculated, then according to the displacement of each distributed point and the second displacement transfer function of each vibration actuator to each distributed point, the excitation output of each vibration actuator is calculated; Finally, the excitation output of each vibration actuator is carried out Fourier inverse transform to generate fixed time domain signal, and the time domain excitation signal is output to the vibration actuator, and the vibration actuator starts to work. The method can realize the vibration reduction of each distributed point on the volute, and improve the overall vibration reduction effect of the volute.

Description

Technical Field

[0001] This invention relates to the field of range hood technology, and in particular to a vibration reduction control method for a range hood and a range hood thereof. Background Technology

[0002] A range hood is a kitchen appliance designed to purify the kitchen environment. It works on the principle of fluid dynamics, using a centrifugal fan installed inside to draw in and exhaust cooking fumes. The centrifugal fan consists of a casing, an impeller housed within the casing, and a motor that drives the impeller. As the impeller rotates, a negative pressure is generated at the center of the fan, drawing in the cooking fumes from below. After being accelerated by the fan, the fumes are collected by the casing and guided outwards.

[0003] During the operation of a range hood, after the motor is powered on, the impeller rotates inside the volute, and the operation of the motor and the vibration of the volute will generate noise, affecting the user's experience. There are many existing methods for reducing motor vibration. For example, Chinese utility model patent ZL202223356433.X (authorization announcement number CN219062031U) discloses a volute structure and a range hood. The volute structure has damping and vibration reduction materials inside the vibration isolation plate, which reduces the vibration transmission of the volute structure when the fan is in use, thereby reducing the noise of the range hood. Another example is Chinese invention patent CN202111387690.7 (application publication number CN113864249 A), which discloses a vibration reduction and noise reduction device, a fan, and a range hood. When the fan is working, the elastic buffer can extend the vibration transmission time through the expansion and contraction deformation of the elastic buffer to reduce the impact force generated by the vibration. Then, under the damping effect of the damping plate and the combined effect of the elastic buffer, the vibration of the fan can be more effectively alleviated, and the operating noise of the fan can be reduced.

[0004] While the aforementioned range hoods can achieve some vibration and noise reduction, existing noise reduction methods typically rely on external structures to reduce vibration transmission from the volute structure, thereby mitigating fan vibration. However, these methods cannot achieve distributed vibration control of the range hood's vibrating components throughout the entire operating speed range. Therefore, further improvements to the existing technology are necessary. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a vibration control method for a range hood that can achieve distributed vibration reduction of the volute to improve the vibration reduction effect, in contrast to the above-mentioned prior art.

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

[0007] The technical solution adopted by the present invention to solve the first technical problem mentioned above is as follows: a vibration reduction control method for a range hood, wherein the range hood includes a housing and a fan system installed in the housing, the fan system includes a volute, an impeller disposed in the volute, and a motor driving the impeller to rotate, the volute includes a front cover plate and a rear cover plate arranged at intervals, the rear cover plate is provided with a bracket, and the bracket is provided with N motor mounting points, where N is a positive integer; characterized in that: the bracket is also provided with M acceleration sensors and K vibration actuators, where M and K are both positive integers;

[0008] The vibration reduction control method for the range hood includes the following steps:

[0009] 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. The number of distributed points is the same as that of the vibration actuator.

[0010] S2. 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);

[0011] S3. By sequentially setting n = 1, 2, ... N, and k0 = 1, 2, ... K, obtain the first displacement transfer function from the nth motor mounting point to the k0th distributed point.

[0012] S4. By sequentially setting k1 = 1, 2, ... K and k0 = 1, 2, ... K, obtain the second displacement transfer function from the k1th vibration actuator to the k0th distributed point.

[0013] S5. 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 S2.

[0014] S6. Calculate the displacement of each distributed point based on the excitation force of each motor mounting point in S5 and the first displacement transfer function in S3.

[0015] S7. Calculate the excitation output of each vibration actuator based on the displacement of each distributed point in S6 and the second displacement transfer function in S4.

[0016] S8. Perform an inverse Fourier transform on the excitation output of each vibration actuator in S7 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.

[0017] To ensure that the excitation force at the motor mounting point has a solution, the condition that M and N in S2 must satisfy is: M≥N.

[0018] To calculate the excitation force, the formula for calculating the excitation force at each motor mounting point in S5 is as follows:

[0019]

[0020] 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.

[0021] To achieve the displacement calculation of distributed points, the displacement calculation formula for each distributed point in S6 is as follows:

[0022]

[0023] Where D1(w) is the displacement of the first distributed point, D2(w) is the displacement of the second distributed point, and D... K (w) represents the displacement of the Kth distributed point.

[0024] To calculate the excitation output of the vibration actuator, the excitation output calculation formula for each vibration actuator in S7 is as follows:

[0025]

[0026] 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 K (w) represents the excitation output of the Kth vibration actuator.

[0027] To achieve noise reduction, the following steps are included after step S8:

[0028] S9. Select Q motor speed operating points, where Q is a positive integer, and test the noise value of each motor speed operating point.

[0029] S10. Initialize the value of q to 1;

[0030] S11. 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 S12; otherwise, reduce the side length of the square to L-ΔL and proceed to S2.

[0031] S12. Determine if q is Q. If yes, end; otherwise, add 1 to the value of q and update the value of q, then go to S11.

[0032] 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.

[0033] To facilitate the installation of the motor, the bracket includes two strip support plates arranged side by side at intervals, each strip support plate being connected to the opposite sides of the outer peripheral surface of the motor.

[0034] To improve the overall strength of the bracket and reduce motor vibration, the bracket also includes at least two support frames corresponding to the two strip support plates respectively. Each support frame has a first end connected to the volute and a second end for connecting to its corresponding strip support plate.

[0035] To implement the above vibration reduction control method, a controller is also installed on the bracket. The controller is electrically connected to all acceleration sensors and all vibration actuators. The controller is configured to control the vibration actuators to perform corresponding excitation vibrations based on the data measured by all acceleration sensors and the pre-stored acceleration transfer function, first displacement transfer function and second displacement transfer function.

[0036] Compared with the prior art, the advantages of the present invention are as follows: by drawing a grid diagram on the plane of the front cover plate of the volute to form distributed points, and by calculating the excitation output of each vibration actuator based on the data measured by the acceleration sensor and the pre-stored acceleration transfer function from the motor mounting point to the acceleration sensor, the first displacement transfer function from the motor mounting point to the distributed points, and the second displacement transfer function from the vibration actuator to the distributed points, the vibration reduction of each distributed point on the volute is realized, thereby improving the overall vibration reduction effect of the volute. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the fan system in an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of a grid diagram in an embodiment of the present invention. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0040] 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 four motor mounting points 131 in the middle. M accelerometers (not shown in the figure) and K vibration actuators (not shown in the figure) are also mounted on bracket 13, where N, M, and K are all positive integers. This range hood uses the following vibration reduction control method for vibration reduction.

[0041] In this embodiment, the bracket 13 includes two strip support plates 132 arranged side by side at intervals, and at least two support frames 133 corresponding to the two strip support plates 132 respectively. Each strip support plate 132 is connected to opposite sides of the outer peripheral surface of the motor 3. Each support frame 133 has a first end connected to the volute 1 and a second end for connecting to its corresponding strip support plate 132. The specific structure of the bracket 13 can be referred to the content disclosed in the applicant's earlier patent application with patent number ZL 202121503504.7 (authorization announcement number CN 215521396U).

[0042] Additionally, a controller (not shown in the figure) is installed on bracket 13. The controller is electrically connected to all acceleration sensors and all vibration actuators. The controller is configured to control the vibration actuators to perform corresponding excitation operations based on the data measured by all acceleration sensors and the pre-stored acceleration transfer function, the first displacement transfer function described below, and the second displacement transfer function described below.

[0043] The characteristic of the range hood vibration reduction control method in this embodiment is:

[0044] The vibration reduction control method for the range hood includes the following steps:

[0045] S1. Draw i horizontal lines and j vertical lines at equal intervals on the plane of the front cover plate of the volute, where i and j are both positive integers, forming a grid. The grid has (i-1)*(j-1) squares with side length L, and the outer contour of the front cover plate is within the grid. The squares within the projection of the front cover plate are designated as distributed points, with the number of distributed points being the same as that of the vibration actuator. The grid is as follows: Figure 2 As shown;

[0046] S2. 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);

[0047] To ensure that the solution to the system of equations is positive definite or overpositive definite (has a solution), the condition that M and N satisfy in this embodiment is: M≥N;

[0048] S3. By sequentially setting n = 1, 2, ... N, and k0 = 1, 2, ... K, obtain the first displacement transfer function from the nth motor mounting point to the k0th distributed point.

[0049] S4. By sequentially setting k1 = 1, 2, ... K and k0 = 1, 2, ... K, obtain the second displacement transfer function from the k1th vibration actuator to the k0th distributed point.

[0050] S5. 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 S2.

[0051] In this embodiment, the formula for calculating the excitation force at each motor mounting point is:

[0052]

[0053] 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 sensor; In order to obtain The inverse matrix;

[0054] S6. Calculate the displacement of each distributed point based on the excitation force of each motor mounting point in S5 and the first displacement transfer function in S3.

[0055] In this embodiment, the displacement calculation formula for each distributed point is:

[0056]

[0057] Where D1(w) is the displacement of the first distributed point, D2(w) is the displacement of the second distributed point, and D... K (w) represents the displacement of the Kth distributed point;

[0058] S7. Calculate the excitation output of each vibration actuator based on the displacement of each distributed point in S6 and the second displacement transfer function in S4.

[0059] In this embodiment, the excitation output calculation formula for each vibration actuator is as follows:

[0060]

[0061] 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 K (w) represents the excitation output of the Kth vibration actuator;

[0062] S8. Perform an inverse Fourier transform on the excitation output of each vibration actuator in S7 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, so that the vibration displacement of the distributed points on the front cover plate 11 and the rear cover plate 12 of the volute is 0.

[0063] In addition, S8 includes the following steps:

[0064] S9. Select Q motor speed operating points, where Q is a positive integer, and test the noise value of each motor speed operating point.

[0065] S10. Initialize the value of q to 1;

[0066] S11. 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 S12; otherwise, reduce the side length of the square to L-ΔL and proceed to S2.

[0067] S12. Determine if q is Q. If yes, end; otherwise, add 1 to the value of q and update the value of q, then go to S11.

[0068] The vibration and noise targets set for each working condition are automatically achieved through steps S9 to S12.

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 K vibration actuators, where M and K are both positive integers; 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. The number of distributed points is the same as that of the vibration actuator. S2. 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. By sequentially setting n = 1, 2, ... N, and k0 = 1, 2, ... K, obtain the first displacement transfer function from the nth motor mounting point to the k0th distributed point. S4. By sequentially setting k1 = 1, 2, ... K and k0 = 1, 2, ... K, obtain the second displacement transfer function from the k1th vibration actuator to the k0th distributed point. S5. 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 S2. S6. Calculate the displacement of each distributed point based on the excitation force of each motor mounting point in S5 and the first displacement transfer function in S3. S7. Calculate the excitation output of each vibration actuator based on the displacement of each distributed point in S6 and the second displacement transfer function in S4. S8. Perform an inverse Fourier transform on the excitation output of each vibration actuator in S7 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.

2. The vibration reduction control method for a range hood according to claim 1, characterized in that: The condition that M and N satisfy in S2 is: M≥N.

3. The vibration reduction control method for a range hood according to claim 1, characterized in that: The formula for calculating the excitation force at each motor mounting point in S5 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.

4. The vibration reduction control method for a range hood according to claim 3, characterized in that: The displacement calculation formula for each distributed point in S6 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... K (w) represents the displacement of the Kth distributed point.

5. The vibration reduction control method for a range hood according to claim 4, characterized in that: The excitation output calculation formula for each vibration actuator in S7 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 K (w) represents the excitation output of the Kth vibration actuator.

6. The vibration reduction control method for a range hood according to any one of claims 1 to 5, characterized in that: The step following S8 is as follows: S9. Select Q motor speed operating points, where Q is a positive integer, and test the noise value of each motor speed operating point. S10. Initialize the value of q to 1; S11. 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 S12; otherwise, reduce the side length of the square to L-ΔL and proceed to S2. S12. Determine if q is Q. If yes, end; otherwise, add 1 to the value of q and update the value of q, then go to S11.

7. 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 6 above.

8. The range hood according to claim 7, characterized in that: The bracket (13) includes two strip support plates (132) arranged side by side at intervals, each strip support plate (132) being connected to the opposite sides of the outer peripheral surface of the motor (3).

9. The range hood according to claim 8, characterized in that: The bracket (13) further includes at least two support frames (133) corresponding to the two strip support plates (132) respectively, each support frame (133) having a first end connected to the volute (1) and a second end for connecting to its corresponding strip support plate (132).

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