Vibration reduction method, vibration reduction system, and range hood

Abstract

The present application relates to a kind of vibration reduction method, vibration reduction system and extractor hood, the vibration reduction method obtains the motor body vibration acceleration value and the motor installation positioning hole vibration acceleration value on motor mounting bracket in the current speed state corresponding to motor when extractor hood operates stably, obtains the vibration transmission coefficient in the current speed state of motor, and when motor body vibration acceleration value is less than the preset vibration acceleration threshold value corresponding to the current speed state of motor, maintain the motor speed unchanged, otherwise adjust motor operating voltage to make motor body vibration acceleration value less than the preset vibration acceleration threshold value, calculate the real-time damping of vibration isolation structure, once the real-time damping of vibration isolation structure is greater than the critical damping of vibration isolation structure, execute the cooling treatment measure generated based on the current temperature of motor, to reduce the heat transferred to vibration isolation structure, reduce the damping coefficient of the vibration isolation structure, enhance the vibration isolation effect of vibration isolation structure, realize the purpose of eliminating abnormal sound by controlling the damping coefficient of vibration isolation structure.

Description

Technical Field

[0001] This invention relates to the field of range hoods, and more particularly to a vibration reduction method, a vibration reduction system, and a range hood. Background Technology

[0002] A range hood, also known as a cooking hood, is installed above the kitchen stove to quickly remove harmful cooking fumes and exhaust them outdoors. As people's living standards continue to improve, range hoods have become an indispensable household appliance in the kitchen.

[0003] The range hood contains a fan system, which includes a volute, a motor, and an impeller. The volute is mounted to the top and rear panel via a mounting bracket, and the volute also has a motor mounting bracket with mounting holes. The motor is mounted to the bracket using screws passing through these holes. The impeller is mounted on the motor shaft. The motor drives the impeller to rotate, creating negative pressure to draw away the cooking fumes. As airflow increases, the demands on the fume extraction efficiency of range hoods also rise. This leads to further improvements in motor performance. Under increased load, the motor's vibration can change abruptly due to the dynamic imbalance caused by the load, transmitting to the volute and the entire unit, resulting in abnormal noise.

[0004] To avoid abnormal noise caused by sudden changes in motor vibration, an elastic rubber structure is usually fixed between the motor and the motor mounting bracket using screws as a vibration isolation structure. This vibration isolation structure achieves a vibration reduction effect, thereby eliminating abnormal noise caused by sudden changes in motor vibration.

[0005] However, current vibration reduction solutions for range hood fan systems have shortcomings: they do not consider the high temperatures generated by the motor during operation, which directly transfers this heat to the vibration isolation structure, causing an increase in the damping coefficient of the isolation structure. An increase in the damping coefficient of the isolation structure will reduce its vibration isolation effect, hindering noise reduction. Summary of the Invention

[0006] The first technical problem to be solved by the present invention is to provide a vibration reduction method that can eliminate abnormal noise by controlling the damping coefficient of the vibration isolation structure, in contrast to the above-mentioned prior art.

[0007] The second technical problem to be solved by the present invention is to provide a vibration reduction system for implementing the vibration reduction method.

[0008] The third technical problem to be solved by the present invention is to provide a range hood that uses the above-mentioned vibration reduction system.

[0009] The technical solution adopted by this invention to solve the first technical problem is: a vibration reduction method, applicable to range hoods with a vibration isolation structure fixed between the motor and the motor mounting bracket, characterized in that the vibration reduction method includes:

[0010] Step 1: Obtain the current speed of the motor when the range hood is running stably, and the vibration acceleration value of the motor body at that current speed.

[0011] Step 2: Obtain the vibration acceleration value of the motor mounting positioning hole on the motor mounting bracket at the current motor speed.

[0012] Step 3: Calculate the vibration transmission coefficient at the current motor speed based on the obtained vibration acceleration values ​​of the motor body and the motor mounting positioning holes.

[0013] Step 4: Determine whether the obtained vibration acceleration value of the motor body is less than the preset vibration acceleration threshold corresponding to the current motor speed state.

[0014] When the vibration acceleration value of the motor body is less than the corresponding preset vibration acceleration threshold, the current speed of the motor is maintained; otherwise, the working voltage of the motor at the current speed is adjusted until the vibration acceleration value of the motor body after the working voltage adjustment is less than the preset vibration acceleration threshold corresponding to the current speed of the motor, and then proceed to step 5.

[0015] Step 5: Calculate the critical damping of the vibration isolation structure, and obtain the real-time damping of the vibration isolation structure at the current motor speed based on the obtained vibration transmission coefficient.

[0016] Step 6: Make a judgment based on the obtained critical damping and real-time damping of the vibration isolation structure:

[0017] When the real-time damping of the vibration isolation structure is less than the critical damping of the vibration isolation structure, the current speed of the motor is maintained; otherwise, cooling measures based on the current temperature of the motor are implemented.

[0018] Improvedly, in the vibration reduction method, the cooling measure is to reduce the temperature of at least one of the motor, the vibration isolation structure, and the motor mounting bracket, so that the real-time damping of the vibration isolation structure is less than the critical damping of the vibration isolation structure.

[0019] Optionally, in the vibration reduction method, the current speed state is the current speed value of the motor or / and the speed range corresponding to the current speed value of the motor.

[0020] In a further improvement, in the vibration reduction method, in step 4, the adjustment of the operating voltage of the motor at the current speed is changed to a reduction in the operating voltage.

[0021] Improvedly, in the vibration reduction method, in step 3, the vibration transmission coefficient of the motor at its current speed is calculated as follows:

[0022]

[0023] Where P is the vibration transmission coefficient at the current motor speed, and V a V represents the vibration acceleration value of the motor body at the current speed. b This represents the vibration acceleration value of the motor mounting positioning hole at the current motor speed.

[0024] Furthermore, in the vibration reduction method, in step 5, the calculation methods for the critical damping of the vibration isolation structure and the real-time damping of the vibration isolation structure are as follows:

[0025]

[0026] Wherein, ζ0 is the critical damping of the vibration isolation structure, m is the mass value of the vibration isolation structure, K is the stiffness value of the vibration isolation structure; ζ is the real-time damping of the vibration isolation structure, μ is the damping coefficient of the vibration isolation structure, and P is the vibration transmission coefficient at the current motor speed.

[0027] The technical solution adopted by the present invention to solve the second technical problem is: a vibration reduction system that implements any of the vibration reduction methods described in the present invention, characterized in that it comprises:

[0028] The motor speed acquisition device shall at least acquire the motor speed status when the range hood is running stably;

[0029] The motor vibration acceleration acquisition device collects the vibration acceleration value of the motor body at the corresponding speed state when the range hood is running stably;

[0030] The positioning hole vibration acceleration acquisition device collects the vibration acceleration value of the motor mounting positioning hole on the motor mounting bracket at the corresponding speed state when the range hood is running stably;

[0031] Temperature acquisition device to collect motor temperature;

[0032] The processor is connected to the motor speed acquisition device, the motor vibration acceleration acquisition device, the positioning hole vibration acceleration acquisition device, and the temperature acquisition device, respectively. It processes the motor speed status acquired by the motor speed acquisition device, the vibration acceleration value acquired by the motor vibration acceleration acquisition device, the vibration acceleration value acquired by the positioning hole vibration acceleration acquisition device, and the motor temperature acquired by the temperature acquisition device, and generates the cooling treatment measure instruction.

[0033] The cooling actuator executes the cooling measures instructions generated by the processor.

[0034] Improvedly, in the vibration reduction system, the cooling actuator is a processor-controlled refrigeration device.

[0035] The technical solution adopted by the present invention to solve the third technical problem is: a range hood, characterized in that it applies any of the vibration reduction systems described in the present invention.

[0036] Compared with the prior art, the advantages of the present invention are as follows: The vibration reduction method of the present invention obtains the vibration acceleration value of the motor body at the current speed state corresponding to the stable operation of the range hood and the vibration acceleration value of the motor mounting positioning hole on the motor mounting bracket, thereby obtaining the vibration transmission coefficient at the current speed state of the motor. When the vibration acceleration value of the motor body is less than the preset vibration acceleration threshold corresponding to the current speed state of the motor, the motor speed is kept constant; otherwise, the operating voltage of the motor is adjusted so that the vibration acceleration value of the motor body is less than the preset vibration acceleration threshold. Furthermore, the critical damping of the vibration isolation structure and the real-time damping of the vibration isolation structure corresponding to the current speed state of the motor are calculated. Once the real-time damping of the vibration isolation structure is greater than the critical damping of the vibration isolation structure, cooling measures based on the current temperature of the motor are implemented to reduce abnormal noise, thereby reducing the heat transferred to the vibration isolation structure. By reducing the heat of the vibration isolation structure, the damping coefficient of the vibration isolation structure is reduced, thereby enhancing the vibration isolation effect of the vibration isolation structure. This achieves the purpose of eliminating abnormal noise by controlling the damping coefficient of the vibration isolation structure. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the vibration reduction method in an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the vibration reduction system 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] This embodiment provides a vibration reduction method applicable to range hoods where a vibration isolation structure is fixed between the motor and the motor mounting bracket. Specifically, see... Figure 1 As shown, the vibration reduction method of this embodiment includes the following steps:

[0041] Step 1: Obtain the current speed state of the motor when the range hood is running stably, and the vibration acceleration value of the motor body at that current speed state; wherein, the current speed state here can be a speed range or a specific speed value; in this embodiment, it is assumed that the vibration acceleration value of the motor body at that current speed state is denoted as V. a ;

[0042] Step 2: Obtain the vibration acceleration value of the motor mounting positioning hole on the motor mounting bracket at the current motor speed; where, it is assumed that the vibration acceleration value of the motor mounting positioning hole at the current motor speed is V.b ;

[0043] Step 3: Based on the obtained vibration acceleration values ​​of the motor body and the motor mounting positioning holes, calculate the vibration transmission coefficient at the current motor speed. For example, in this embodiment, the vibration transmission coefficient at the current motor speed is calculated as follows:

[0044]

[0045] Where P is the vibration transmission coefficient at the current motor speed, and V a V represents the vibration acceleration value of the motor body at the current speed. b V represents the vibration acceleration value of the motor mounting hole at the current motor speed. b >0;

[0046] Step 4: Determine whether the obtained vibration acceleration value of the motor body is less than the preset vibration acceleration threshold corresponding to the current motor speed state.

[0047] When the vibration acceleration value of the motor body is less than the corresponding preset vibration acceleration threshold, it means that the current vibration acceleration of the motor body is within the allowable vibration acceleration range, and the current speed of the motor is maintained. Otherwise, it means that the current vibration acceleration of the motor body exceeds the allowable vibration acceleration range, and the operating voltage of the motor at the current speed needs to be adjusted until the vibration acceleration value of the motor body after the operating voltage adjustment is less than the preset vibration acceleration threshold corresponding to the current speed of the motor, and then proceed to step 5. After adjusting the operating voltage of the motor, for example, by reducing the operating voltage of the motor, the vibration acceleration value of the motor body needs to be obtained again, and the newly obtained vibration acceleration value of the motor body needs to be compared with the previously existing preset vibration acceleration threshold for judgment.

[0048] Step 5: Calculate the critical damping of the vibration isolation structure, and obtain the real-time damping of the vibration isolation structure corresponding to the current motor speed based on the obtained vibration transmission coefficient; for example, in this embodiment, the calculation methods for the critical damping and real-time damping of the vibration isolation structure are as follows:

[0049]

[0050] Where ζ0 is the critical damping of the vibration isolation structure, m is the mass value of the vibration isolation structure, K is the stiffness value of the vibration isolation structure; ζ is the real-time damping of the vibration isolation structure, μ is the damping coefficient of the vibration isolation structure, and P is the vibration transmission coefficient at the current motor speed.

[0051] Step 6: Make a judgment based on the obtained critical damping and real-time damping of the vibration isolation structure:

[0052] When the real-time damping of the vibration isolation structure is less than its critical damping, it indicates that the current vibration acceleration value of the motor bracket does not exceed the acceleration value of the motor body, resulting in vibration attenuation and no risk of abnormal noise. Therefore, the motor's current speed is maintained. Otherwise, it indicates that the current vibration acceleration value of the motor bracket exceeds the acceleration value of the motor body, resulting in vibration amplification and a risk of abnormal noise. Cooling measures based on the motor's current temperature are then implemented to reduce noise. For example, the cooling measures here involve reducing the temperature of at least one of the motor, vibration isolation structure, and motor mounting bracket so that the real-time damping of the vibration isolation structure is less than its critical damping. Ideally, cooling treatment should be applied to the motor and motor mounting bracket to reduce the heat transferred to the vibration isolation structure, thereby reducing the damping coefficient of the vibration isolation structure and enhancing its vibration isolation effect.

[0053] This embodiment provides a vibration reduction system for implementing the above-described vibration reduction method. Specifically, see... Figure 2 As shown, the vibration reduction system includes:

[0054] The motor speed acquisition device 1 acquires at least the motor speed status when the range hood is running stably;

[0055] Motor vibration acceleration acquisition device 2, acquires the vibration acceleration value of the motor body at the corresponding speed state when the range hood is running stably;

[0056] The positioning hole vibration acceleration acquisition device 3 acquires the vibration acceleration value of the motor mounting positioning hole on the motor mounting bracket at the corresponding speed state when the range hood is running stably;

[0057] Temperature acquisition device 4 collects the motor temperature;

[0058] The processor 5 is connected to the motor speed acquisition device 1, the motor vibration acceleration acquisition device 2, the positioning hole vibration acceleration acquisition device 3, and the temperature acquisition device 4, respectively. It processes the motor speed status acquired by the motor speed acquisition device, the vibration acceleration value acquired by the motor vibration acceleration acquisition device, the vibration acceleration value acquired by the positioning hole vibration acceleration acquisition device, and the motor temperature acquired by the temperature acquisition device to generate the aforementioned cooling treatment instructions.

[0059] The cooling actuator 6 executes the cooling measures instructions generated by the processor 5. In this embodiment, the cooling actuator 6 is a refrigeration device controlled by the processor 5.

[0060] This embodiment also provides a range hood. The range hood includes a motor, a motor mounting bracket, and a vibration isolation structure fixed between the motor and the mounting bracket. The motor mounting bracket has motor mounting positioning holes required for fixing the motor. The range hood utilizes the aforementioned vibration reduction system.

[0061] Although preferred embodiments of the present invention have been described in detail above, it should be clearly understood that various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A vibration reduction method, applicable to range hoods where a vibration isolation structure is fixed between the motor and the motor mounting bracket, characterized in that, The vibration reduction method includes: Step 1: Obtain the current speed of the motor when the range hood is running stably, and the vibration acceleration value of the motor body at that current speed. Step 2: Obtain the vibration acceleration value of the motor mounting positioning hole on the motor mounting bracket at the current motor speed. Step 3: Calculate the vibration transmission coefficient at the current motor speed based on the obtained vibration acceleration values ​​of the motor body and the motor mounting positioning holes. Step 4: Determine whether the obtained vibration acceleration value of the motor body is less than the preset vibration acceleration threshold corresponding to the current motor speed state. When the vibration acceleration value of the motor body is less than the corresponding preset vibration acceleration threshold, the current speed of the motor is maintained; otherwise, the working voltage of the motor at the current speed is adjusted until the vibration acceleration value of the motor body after the working voltage adjustment is less than the preset vibration acceleration threshold corresponding to the current speed of the motor, and then proceed to step 5. Step 5: Calculate the critical damping of the vibration isolation structure, and obtain the real-time damping of the vibration isolation structure at the current motor speed based on the obtained vibration transmission coefficient. Step 6: Make a judgment based on the obtained critical damping and real-time damping of the vibration isolation structure: When the real-time damping of the vibration isolation structure is less than the critical damping of the vibration isolation structure, the current speed of the motor is maintained; otherwise, cooling measures based on the current temperature of the motor are implemented.

2. The vibration reduction method according to claim 1, characterized in that, The cooling measures involve reducing the temperature of at least one of the following structures: the motor, the vibration isolation structure, and the motor mounting bracket, so that the real-time damping of the vibration isolation structure is less than the critical damping of the vibration isolation structure.

3. The vibration reduction method according to claim 1, characterized in that, The current speed state refers to the current motor speed value and / or the speed range corresponding to the current motor speed value.

4. The vibration reduction method according to claim 1, characterized in that, In step 4, adjusting the operating voltage of the motor at the current speed is to reduce the operating voltage.

5. The vibration reduction method according to any one of claims 1 to 4, characterized in that, In step 3, the vibration transmission coefficient of the motor at its current speed is calculated as follows: Where P is the vibration transmission coefficient at the current motor speed, and V a V represents the vibration acceleration value of the motor body at the current speed. b V represents the vibration acceleration value of the motor mounting hole at the current motor speed. b >0.

6. The vibration reduction method according to claim 5, characterized in that, In step 5, the critical damping of the vibration isolation structure and the real-time damping of the vibration isolation structure are calculated as follows: Wherein, ζ0 is the critical damping of the vibration isolation structure, m is the mass value of the vibration isolation structure, K is the stiffness value of the vibration isolation structure; ζ is the real-time damping of the vibration isolation structure, μ is the damping coefficient of the vibration isolation structure, and P is the vibration transmission coefficient at the current motor speed.

7. A vibration reduction system implementing the vibration reduction method according to any one of claims 1 to 6, characterized in that, include: The motor speed acquisition device (1) acquires at least the motor speed state corresponding to the stable operation of the range hood; Motor vibration acceleration acquisition device (2) acquires the vibration acceleration value of the motor body at the corresponding speed state when the range hood is running stably; The positioning hole vibration acceleration acquisition device (3) acquires the vibration acceleration value of the motor mounting positioning hole on the motor mounting bracket at the corresponding speed state when the range hood is running stably; Temperature acquisition device (4) acquires motor temperature; The processor (5) is connected to the motor speed acquisition device (1), the motor vibration acceleration acquisition device (2), the positioning hole vibration acceleration acquisition device (3), and the temperature acquisition device (4), respectively. It processes the motor speed status acquired by the motor speed acquisition device (1), the vibration acceleration value acquired by the motor vibration acceleration acquisition device (2), the vibration acceleration value acquired by the positioning hole vibration acceleration acquisition device (3), and the motor temperature acquired by the temperature acquisition device (4) to generate the cooling treatment measure instruction. The cooling actuator (6) executes the cooling measures instructions generated by the processor (5).

8. The vibration reduction system according to claim 7, characterized in that, The cooling actuator (6) is a refrigeration device controlled by a processor.

9. A range hood, characterized in that, The vibration reduction system described in claim 7 or 8 is applied.

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