Range hood vibration reduction control method and range hood

Abstract

The present application relates to a range hood vibration control method and a range hood, the vibration control method comprising: obtaining an acceleration transfer function; selecting a selected point on the free end of the smoke baffle, obtaining a first displacement transfer function from each volute mounting point to the selected point; obtaining a second displacement transfer function from the vibration actuator mounting point to the selected point; calculating the excitation force of each volute mounting point according to the data measured by all acceleration sensors and the acceleration transfer function; calculating the displacement of the selected point according to the excitation force of each volute mounting point and the first displacement transfer function; calculating the excitation output of the vibration actuator according to the displacement of the selected point and the second displacement transfer function; finally, performing Fourier inverse transform on the excitation output of the vibration actuator to generate a fixed time domain signal, outputting the time domain excitation signal to the vibration actuator, and controlling the vibration actuator to start working. The method can realize the vibration reduction of the smoke baffle and improve the overall vibration reduction effect of the range hood.

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. The oil fume is sucked by a 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, which sucks the oil fume below the range hood into the fan. After being accelerated by the fan, the oil fume is collected and guided by the volute and discharged outdoors.

[0003] The current range hood includes a shell with an air inlet on the front side, a smoke baffle constrained in front of the air inlet in a manner of being able to be flipped relative to the shell, and a movement mechanism for driving the movement of the smoke baffle. The movement mechanism includes a driving motor. Therefore, in addition to the vibration generated by the operation of the centrifugal fan, the smoke baffle will also vibrate during the flipping process due to the driving force of the driving motor, which is fixed on the wall of the shell, and thus abnormal noise is easily caused.

[0004] To solve this technical problem, a range hood is disclosed in Chinese Patent Application No. CN202210281036.6 (Publication No. CN114719312A), which includes a smoke collecting cavity, a smoke baffle, and a driving mechanism. The driving mechanism is connected with the smoke baffle and drives the rotation of the smoke baffle. The driving mechanism is connected with the smoke baffle through a flipping link. A smoke baffle mounting seat for mounting the flipping link and a push rod support for mounting the driving mechanism are arranged on the wall of the smoke collecting cavity. The flipping link is rotationally connected with the smoke baffle mounting seat. The driving mechanism is a linear driving mechanism. The linear driving mechanism is rotationally connected with the push rod support and the flipping link. The linear driving mechanism drives the flipping link to rotate around the smoke baffle mounting seat, thereby driving the smoke baffle to flip to open or close the smoke collecting cavity.

[0005] Although the above-mentioned patent can avoid the abnormal noise problem caused by the deformation of the smoke collecting cavity by dispersing the stress on the wall of the smoke collecting cover, the above-mentioned patent still has the following use limitations: the vibration of the smoke baffle during the movement of the smoke baffle will generate noise, and the above-mentioned range hood cannot solve this technical problem.

[0006] Therefore, it is necessary to further improve the prior art. SUMMARY

[0007] The first technical problem to be solved by the present application is to provide a range hood vibration reduction control method capable of reducing the vibration of the smoke baffle and improving the vibration reduction effect of the range hood.

[0008] The second technical problem to be solved by the present application is to provide an extractor hood using the above-mentioned extractor hood vibration control method.

[0009] The technical solution adopted by the present application to solve the first technical problem is as follows: an extractor hood vibration control method, wherein the extractor hood comprises a fume collecting hood, a fan frame arranged above the fume collecting hood, and a fan system arranged in the fan frame, the fan system comprises a volute, the front side of the fume collecting hood is provided with an air inlet and a smoke baffle rotatably constrained in front of the air inlet, the wall surface of the fan frame is provided with N volute mounting points, N is a positive integer; characterized in that: M acceleration sensors and one vibration actuator are mounted on the fume collecting hood, M is a positive integer.

[0010] The extractor hood vibration control method comprises the following steps:

[0011] S1, sequentially set n = 1, 2, … N, and m = 1, 2, … M, and obtain the acceleration transfer function Hn,m(ω) from the nth volute mounting point to the mth acceleration sensor; Fn-Am (ω);

[0012] S2, select a selected point on the free end of the smoke baffle, and sequentially set n = 1, 2, … N, and obtain the first displacement transfer function Hn(ω) from the nth volute mounting point to the selected point; Fn-D (ω);

[0013] S3, obtain the second displacement transfer function H(ω) from the vibration actuator mounting point to the selected point in S2; E-D (ω);

[0014] S4, during the operation of the extractor hood, obtain the data measured by all the acceleration sensors, and calculate the exciting force of each volute mounting point according to the data measured by all the acceleration sensors and the acceleration transfer function in S1;

[0015] S5, calculate the displacement of the selected point according to the exciting force of each volute mounting point in S4 and the first displacement transfer function in S2;

[0016] S6, calculate the excitation output of the vibration actuator according to the displacement of the selected point in S5 and the second displacement transfer function in S3;

[0017] S7, perform Fourier inverse transform on the excitation output of the vibration actuator in S6 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.

[0018] In the present solution, the acceleration sensors and the vibration actuator are both mounted on the same side inner wall of the fume collecting hood.

[0019] In order to ensure that the exciting force solution of the volute mounting point has a solution, the condition that M and N satisfy in the S1 is: M >= N.

[0020] In order to realize the calculation of the exciting force, the exciting force calculation formula of each volute mounting point in the S4 is:

[0021]

[0022] Wherein, F1(w) is the exciting force of the first volute mounting point, F2(w) is the exciting force of the second volute mounting point, F N (w) is the exciting force of the Nth volute 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.

[0023] In order to realize the displacement calculation of the distributed point, the displacement D(w) calculation formula of the selected point in the S5 is:

[0024]

[0025] In order to realize the excitation output calculation of the vibration actuator, the excitation output E(w) calculation formula of the vibration actuator in the S6 is:

[0026] E(w) = D(w) * e jπ / H E-D (ω).

[0027] In order to improve the vibration reduction effect of the smoke baffle, the selected point in the S2 is located at the central part of the free end of the smoke baffle.

[0028] In the above scheme, after the vibration actuator starts to work in the S7, the vibration is transmitted to the smoke baffle, so that the vibration displacement of the smoke baffle is 0.

[0029] The technical scheme adopted by the application to solve the second technical problem is: a range hood characterized by applying the range hood vibration reduction method as described above.

[0030] In order to realize the above vibration reduction control method, a controller is further installed in the smoke collecting cover or the fan frame, the controller is electrically connected with all the acceleration sensors and the vibration actuators, and the controller is configured to control the vibration actuators to perform corresponding exciting vibration 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.

[0031] Compared with the prior art, the advantages of the present invention are as follows: by selecting a point on the free end of the smoke baffle, and based on the data measured by the accelerometer and the pre-stored acceleration transfer function from the volute mounting point to the accelerometer, the first displacement transfer function from the volute mounting point to the selected point, and the second displacement transfer function from the vibration actuator mounting point to the selected point, the excitation output of the vibration actuator is calculated, thereby realizing the vibration reduction of the smoke baffle and improving the overall vibration reduction effect of the range hood. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the range hood in an embodiment of the present invention. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0034] like Figure 1 As shown, the range hood in this embodiment includes a smoke collection hood 1, a fan frame 2 mounted on the smoke collection hood 1, and a fan system mounted within the fan frame 2. The fan system includes a volute (not shown in the figure). The front side of the smoke collection hood 1 has an air inlet 11 and a baffle plate 12 that is rotatably constrained in front of the air inlet 11. The fan frame 2 has N volute mounting points (not shown in the figure), where N is a positive integer. The smoke collection hood 1 is equipped with M acceleration sensors (not shown in the figure) and a vibration actuator (not shown in the figure), where M is a positive integer. The above-described range hood is a structure used in the prior art, and will not be described in detail here.

[0035] The range hood uses the following vibration reduction control method for vibration reduction, and the condition that M and N satisfy is: M≥N; in addition, the acceleration sensor and the vibration actuator are both installed on the same inner wall of the smoke hood 1.

[0036] A controller is also installed inside the smoke hood 1 or the fan frame 2. The controller is electrically connected to all acceleration sensors and vibration actuators. The controller is configured to control the vibration actuator 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.

[0037] The vibration reduction control method for the range hood in this embodiment includes the following steps:

[0038] S1. Sequentially set n = 1, 2, ... N, m = 1, 2, ... M, and obtain the acceleration transfer function H from the nth volute mounting point to the mth accelerometer. Fn-Am (ω);

[0039] S2, select a selected point on the free end of the smoke baffle, and sequentially make n = 1, 2, … N to obtain the first displacement transfer function H of the nth volute mounting point to the selected point Fn-D (ω);

[0040] In this embodiment, the selected point is located at the center of the free end of the smoke baffle 12.

[0041] S3, obtain the second displacement transfer function H of the vibration actuator mounting point to the selected point in S2 E-D (ω);

[0042] S4, obtain the data measured by all acceleration sensors during the operation of the range hood, and calculate the exciting force of each volute mounting point according to the data measured by all acceleration sensors and the acceleration transfer function in S1.

[0043] In this embodiment, the exciting force calculation formula of each volute mounting point is:

[0044]

[0045] Wherein, F1(w) is the exciting force of the first volute mounting point, F2(w) is the exciting force of the second volute mounting point, F N (w) is the exciting force of the Nth volute 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 ;

[0046] S5, calculate the displacement of the selected point according to the exciting force of each volute mounting point in S4 and the first displacement transfer function in S2.

[0047] In this embodiment, the displacement D(w) of the selected point is calculated as follows:

[0048]

[0049] S6, calculate the excitation output of the vibration actuator according to the displacement of the selected point in S5 and the second displacement transfer function in S3.

[0050] In this embodiment, the excitation output E(w) of the vibration actuator is calculated as follows:

[0051] E(w) = D(w) * e jπ / H E-D (ω)

[0052] S7, Fourier inverse transform of the excitation output of the vibration actuator in S6 to generate a fixed time domain signal, output the time domain signal to the vibration actuator, control the vibration actuator to start working, after the vibration actuator starts working, the vibration is transmitted to the smoke baffle, so that the vibration displacement of the smoke baffle is 0.

Claims

1. A vibration reduction control method for a range hood, the range hood comprising a smoke collection hood, a fan frame mounted on the smoke collection hood, and a fan system mounted within the fan frame, the fan system comprising a volute, the front side of the smoke collection hood having an air inlet and a smoke baffle rotatably constrained in front of the air inlet, and the fan frame having N volute mounting points on its wall, where N is a positive integer; characterized in that: The smoke collection hood is equipped with M acceleration sensors and one vibration actuator, where M is a positive integer. The vibration reduction control method for the range hood includes the following steps: S1. Sequentially set n = 1, 2, ... N, m = 1, 2, ... M, and obtain the acceleration transfer function H from the nth volute mounting point to the mth accelerometer. Fn-Am (ω); S2. Select a point on the free end of the smoke baffle, and sequentially set n = 1, 2, ... N, to obtain the first displacement transfer function H from the nth volute mounting point to the selected point. Fn-D (ω); S3. Obtain the second displacement transfer function H from the vibration actuator mounting point to the selected point in S2. E-D (ω); S4. During the operation of the range hood, acquire the data measured by all acceleration sensors, and calculate the excitation force at each volute mounting point based on the data measured by all acceleration sensors and the acceleration transfer function in S1. S5. Calculate the displacement of the selected point based on the excitation force of each volute mounting point in S4 and the first displacement transfer function in S2. S6. Calculate the excitation output of the vibration actuator based on the displacement of the selected point in S5 and the second displacement transfer function in S3. S7. Perform an inverse Fourier transform on the excitation output of the vibration actuator in S6 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 acceleration sensor and the vibration actuator are both installed on the same inner wall of the smoke hood.

3. The vibration reduction control method for a range hood according to claim 1, characterized in that: The condition that M and N satisfy in S1 is: M≥N.

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 volute mounting point in S4 is as follows: Where F1(w) is the excitation force at the first volute mounting point, and F2(w) is the excitation force at the second volute mounting point. N (w) represents the excitation force at the Nth volute mounting point, A1(w) represents the data measured by the first accelerometer, and A2(w) represents the data measured by the second accelerometer. 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 formula for calculating the displacement D(w) of the selected point in S5 is as follows:

6. The vibration reduction control method for a range hood according to claim 5, characterized in that: The excitation output E(w) of the vibration actuator in S6 is calculated using the following formula: E(w)=D(w)*e jπ / H E-D (ω)。 7. The vibration reduction control method for a range hood according to any one of claims 1 to 6, characterized in that: The selected point in S2 is located at the center of the free end of the smoke baffle.

8. The vibration reduction control method for a range hood according to claim 7, characterized in that: After the vibration actuator in S7 starts working, the vibration is transmitted to the smoke baffle, so that the vibration displacement of the smoke baffle is 0.

9. 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 8 above.

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