Range hood noise reduction method, medium, range hood noise reduction mechanism, and range hood

Abstract

The present application relates to a kind of range hood noise reduction method, medium, range hood noise reduction mechanism and range hood, by judging the detected smoke exhaust resistance value greater than or equal to the preset smoke exhaust resistance threshold value, and the detected range hood air inlet place noise value greater than the preset noise threshold value, increase auxiliary air inlet passage air inlet area and reduce fan speed, the air inlet place noise value still greater than the preset noise threshold value, continue to increase auxiliary air inlet passage air inlet area and reduce fan speed, otherwise, again detect the smoke exhaust resistance value, in the smoke exhaust resistance value less than or equal to the preset smoke exhaust resistance threshold value and smoke exhaust resistance value current state duration greater than or equal to the preset time when, make range hood air inlet area restore to the initial state when not increase auxiliary air inlet passage air inlet area. Thus, by adjusting auxiliary air inlet passage air inlet area can utilize silencer to reduce range hood noise, and the area of air inlet passage occupied by silencer is compensated to improve oil fume suction effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of range hood, in particular to a range hood noise reduction method, medium, range hood noise reduction mechanism and range hood. BACKGROUND

[0002] The range hood, also known as the extractor hood, can quickly remove the oil fume generated during the cooking process, which is harmful to human body, and discharge it outdoors. With the continuous improvement of people's living standards, the extractor hood has become an essential household appliance in the kitchen.

[0003] Chinese utility model patent CN220506873U discloses a sound-attenuating channel device for extractor hood and an extractor hood. The sound-attenuating channel device is arranged in the air inlet channel of the extractor hood and includes a plurality of sound-attenuating units arranged in sequence along the transverse direction perpendicular to the extension direction of the air inlet channel. Each sound-attenuating unit has a sound-attenuating channel with the same extension direction as the air inlet channel. Each sound-attenuating unit further includes a sound-attenuating chamber arranged at the periphery of the sound-attenuating channel and a noise reduction hole distributed on the inner circumferential wall of the sound-attenuating channel and penetrating the sound-attenuating channel and the sound-attenuating chamber. The central frequencies of at least two sound-attenuating units in each sound-attenuating unit are different. The sound-attenuating channel device can achieve noise reduction in a larger low-frequency range and effectively improve the noise reduction effect.

[0004] However, the above-mentioned utility model patent CN220506873U has the following disadvantages: since the sound-attenuating channel device is arranged in the air inlet channel of the extractor hood, the sound-attenuating channel device will occupy the area of the air inlet channel, reducing the air inlet amount into the air inlet channel, which adversely affects the oil fume suction effect of the extractor hood. SUMMARY

[0005] The first technical problem to be solved by the present application is to provide an extractor hood noise reduction method which can effectively reduce the noise of the extractor hood and compensate for the area of the air inlet channel occupied by the sound-attenuating device to improve the oil fume suction effect.

[0006] The second technical problem to be solved by the present application is to provide a readable storage medium for implementing the above-mentioned extractor hood noise reduction method.

[0007] The third technical problem to be solved by the present application is to provide an extractor hood noise reduction mechanism for implementing the above-mentioned extractor hood noise reduction method.

[0008] The fourth technical problem to be solved by the present application is to provide an extractor hood applying the above-mentioned extractor hood noise reduction mechanism.

[0009] The technical solution adopted by the present application to solve the first technical problem is as follows:

[0010] Step 1, detecting the exhaust resistance value of the exhaust hood after starting; wherein the air inlet channel of the exhaust hood is provided with a noise elimination device, and the noise elimination device has an auxiliary air inlet channel capable of adjusting the size of the air inlet area under control;

[0011] Step 2, making a judgment according to the detected exhaust resistance value:

[0012] When the exhaust resistance value is less than or equal to the preset exhaust resistance threshold, go to step 1; otherwise, increase the fan speed of the exhaust hood, and go to step 3;

[0013] Step 3, detecting the noise value at the air inlet of the exhaust hood;

[0014] Step 4, making a judgment according to the detected noise value at the air inlet:

[0015] When the noise value at the air inlet is less than or equal to the preset noise threshold, go to step 1; otherwise, go to step 5;

[0016] Step 5, increasing the air inlet area of the auxiliary air inlet channel in the air inlet channel of the exhaust hood and reducing the fan speed of the exhaust hood, and going to step 6;

[0017] Step 6, detecting the noise value at the air inlet of the exhaust hood again, and making a judgment according to the detected noise value at the air inlet:

[0018] When the noise value at the air inlet is less than or equal to the preset noise threshold, go to step 7; otherwise, go to step 5;

[0019] Step 7, detecting the exhaust resistance value of the exhaust hood again, and making a judgment according to the detected exhaust resistance value:

[0020] When the exhaust resistance value is less than or equal to the preset exhaust resistance threshold and the current state of the exhaust resistance value lasts for more than or equal to the preset time, the air inlet area of the exhaust hood is restored to the initial state before the air inlet area of the auxiliary air inlet channel is increased; otherwise, the air inlet area of the exhaust hood is maintained in the current state.

[0021] Improvements are made in the noise reduction method of the exhaust hood, wherein the air inlet area of the auxiliary air inlet channel is adjusted by the opening and closing of a valve plate controlled by a magnetic force.

[0022] Further, in the noise reduction method of the exhaust hood, the noise elimination device has at least two auxiliary air inlet channels, and the air inlet area of the auxiliary air inlet channel in the air inlet channel of the exhaust hood is increased by adjusting the air inlet area of the auxiliary air inlet channel one by one.

[0023] The technical scheme adopted by the present application to solve the second technical problem is: a readable storage medium, which stores a computer program, and the computer program is characterized in that, when executed by a processor, the oil fume exhaust fan noise reduction method is realized.

[0024] The technical scheme adopted by the present application to solve the third technical problem is: an oil fume exhaust fan noise reduction mechanism for realizing the oil fume exhaust fan noise reduction method, and the mechanism is characterized in that, comprising:

[0025] A smoke exhaust resistance detection device is arranged to detect the smoke exhaust resistance value of the oil fume exhaust fan after starting;

[0026] A fan is arranged in the oil fume exhaust fan;

[0027] A noise detection device is arranged to detect the noise value at the air inlet of the oil fume exhaust fan;

[0028] A noise elimination device is arranged in the air inlet channel of the oil fume exhaust fan and above the air inlet of the oil fume exhaust fan; wherein the noise elimination device has at least one auxiliary air inlet channel which can adjust the size of the air inlet area under control;

[0029] A controller is provided with a timer, and the controller is connected with the smoke exhaust resistance detection device, the fan, the noise detection device and the noise elimination device respectively, and processes the data detected by the smoke exhaust resistance detection device and the noise detection device, and controls the rotation speed of the fan and adjusts the air inlet area of the auxiliary air inlet channel in the air inlet channel of the oil fume exhaust fan.

[0030] In the oil fume exhaust fan noise reduction mechanism, the auxiliary air inlet channel comprises:

[0031] A noise elimination cavity is formed with a noise elimination hole; wherein the lower end opening of the noise elimination cavity is arranged close to the upper side of the air inlet of the oil fume exhaust fan, and the upper opening of the noise elimination cavity is arranged close to the upper end of the air inlet channel of the oil fume exhaust fan;

[0032] An acoustic material is arranged in the noise elimination cavity;

[0033] A valve plate is arranged at the lower end opening of the noise elimination cavity;

[0034] A magnetic attraction device with controllable magnetic attraction force is connected with the controller, and the magnetic attraction force of the magnetic attraction device is adjusted to control the opening or closing of the lower end opening of the noise elimination cavity.

[0035] Further, in the oil fume exhaust fan noise reduction mechanism, the magnetic attraction device is an electromagnet.

[0036] The technical scheme adopted by the present application to solve the fourth technical problem is: an oil fume exhaust fan, characterized in that, the oil fume exhaust fan noise reduction mechanism is applied.

[0037] Compared with the prior art, the oil fume exhaust fan noise reduction method has the advantages that: when the detected smoke exhaust resistance value is greater than or equal to the preset smoke exhaust resistance threshold value, the fan rotating speed of the oil fume exhaust fan is increased, the noise value at the air inlet of the oil fume exhaust fan is detected, when the noise value at the air inlet is greater than the preset noise threshold value, the air inlet area of the auxiliary air inlet channel in the air inlet channel of the oil fume exhaust fan is increased and the fan rotating speed of the oil fume exhaust fan is reduced, when the detected noise value at the air inlet is still greater than the preset noise threshold value, the air inlet area of the auxiliary air inlet channel is continuously increased and the fan rotating speed of the oil fume exhaust fan is reduced, and when the noise value at the air inlet is not greater than the preset noise threshold value, the smoke exhaust resistance value is detected again, when the smoke exhaust resistance value is less than or equal to the preset smoke exhaust resistance threshold value and the current state of the smoke exhaust resistance value lasts for a time greater than or equal to the preset time, the air inlet area of the oil fume exhaust fan is restored to the initial state before the air inlet area of the auxiliary air inlet channel is increased, otherwise, the air inlet area of the oil fume exhaust fan is maintained in the current state. In this way, the air inlet area of the auxiliary air inlet channel and the fan rotating speed of the oil fume exhaust fan are controlled and adjusted according to the data processing of the smoke exhaust resistance and the noise at the air inlet of the oil fume exhaust fan, so that the noise of the oil fume exhaust fan can be effectively reduced by using the silencing device, and the air inlet channel area occupied by the silencing device can be compensated to improve the oil fume suction effect. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 The oil fume exhaust fan noise reduction method in the embodiment of the present application is shown in the flowchart;

[0039] Figure 2 The electrical connection of the main components of the oil fume exhaust fan noise reduction mechanism in the embodiment of the present application is shown in the schematic diagram;

[0040] Figure 3 The structure of the oil fume exhaust fan in the embodiment of the present application is shown in the schematic diagram;

[0041] Figure 4 The structure of the silencing device in the embodiment of the present application is shown in the schematic diagram;

[0042] Figure 5 The silencing device shown in another perspective view is shown in the schematic diagram; Figure 4 The valve plate in the oil fume exhaust fan shown in the schematic diagram is in the open state.

[0043] Figure 6 The valve plate in the oil fume exhaust fan shown in the schematic diagram is in the open state. Figure 3 The valve plate in the oil fume exhaust fan shown in the schematic diagram is in the open state. DETAILED DESCRIPTION

[0044] The present application will be further described in detail below with reference to the embodiments combined with the drawings.

[0045] The present embodiment provides an oil fume exhaust fan noise reduction method. Specifically, referring to Figure 1 The oil fume exhaust fan noise reduction method of the present embodiment includes the following steps:

[0046] Step 1, detecting the exhaust resistance value of the range hood after starting; wherein, the inlet channel of the range hood is provided with a noise elimination device, and the noise elimination device has an auxiliary inlet channel which can adjust the size of the inlet area under control; that is, the inlet area of the auxiliary inlet channel can be adjusted, such as increasing the inlet area of the auxiliary inlet channel or reducing the inlet area of the auxiliary inlet channel; assuming that in this embodiment, the detected exhaust resistance value of the range hood is marked as P t , t>0;

[0047] Step 2, making a judgment according to the detected exhaust resistance value:

[0048] When the exhaust resistance value is less than or equal to the preset exhaust resistance threshold value, it means that the range hood is currently subjected to small exhaust resistance, and it is not necessary to compensate the inlet area of the range hood by increasing the inlet area of the auxiliary inlet channel, then step 1 is entered; otherwise, it means that the range hood is currently subjected to large exhaust resistance, and it is necessary to compensate the inlet area of the range hood by increasing the inlet area of the auxiliary inlet channel to ensure the oil fume suction effect of the range hood, then the fan speed of the range hood is increased, and step 3 is entered;

[0049] Assuming that the preset exhaust resistance threshold value in this embodiment is marked as P0, then once it is judged that the detected exhaust resistance value P t ≤P0, step 1 is entered; otherwise, P t >P0, the fan speed of the range hood is increased, and step 3 is entered;

[0050] Step 3, detecting the noise value at the inlet of the range hood; wherein, assuming that the detected noise value at the inlet of the range hood is marked as S t ;

[0051] Step 4, making a judgment according to the detected noise value at the inlet:

[0052] When the noise value at the inlet is less than or equal to the preset noise threshold value, step 1 is entered; otherwise, step 5 is entered;

[0053] Assuming that the preset noise threshold value in this embodiment is marked as S0, once it is judged that the detected noise value at the inlet S t ≤S0, it means that the noise level generated by the range hood is small at this time, then step 1 is entered; otherwise, S t >S0, it means that the noise level generated by the range hood is large at this time, and measures need to be taken to reduce the noise level, then step 5 is entered;

[0054] Step 5, increasing the inlet area of the auxiliary inlet channel in the inlet channel of the range hood and reducing the fan speed of the range hood, and step 6 is entered;

[0055] Step 6, the noise value at the air inlet of the range hood is detected again, and a judgment is made according to the detected noise value at the air inlet:

[0056] When the noise value at the air inlet is less than or equal to the preset noise threshold, that is, S t ≤S0, it means that after taking measures, the noise level of the range hood at this time is acceptable, and then step 7 is entered; otherwise, it means that after taking measures, the noise level of the range hood at this time is still large and cannot be accepted, and then step 5 is entered.

[0057] Step 7, the smoke exhaust resistance value of the range hood is detected again, and a judgment is made according to the detected smoke exhaust resistance value:

[0058] When the smoke exhaust resistance value is less than or equal to the preset smoke exhaust resistance threshold and the current state of the smoke exhaust resistance value lasts for a duration greater than or equal to the preset duration, the air inlet area of the range hood is restored to the initial state before the auxiliary air inlet passage air inlet area is increased; otherwise, the air inlet area of the range hood is maintained in the current state.

[0059] That is, in this step 7, assuming that the preset duration is T0, the smoke exhaust resistance value of the range hood is detected again and marked as P t ', then once it is judged that P t '≤P0, and the current state of the detected smoke exhaust resistance value P t '≤P0 lasts for a duration T≤T0, it means that the noise level of the range hood has been reduced to an acceptable level, and then the air inlet area of the range hood is restored to the initial state before the auxiliary air inlet passage air inlet area is increased. The initial state refers to the state corresponding to the state after the range hood is started and no adjustment has been made to the air inlet area of the auxiliary air inlet passage. In this initial state, the air inlet of the auxiliary air inlet passage is closed, that is, the air inlet area of the auxiliary air inlet passage is zero.

[0060] As an implementation manner of controlling and adjusting the air inlet area of the auxiliary air inlet passage, in this embodiment, the air inlet area of the auxiliary air inlet passage is adjusted by the opening and closing of the valve plate controlled by the magnetic force.

[0061] In order to effectively adjust the air inlet area of the auxiliary air inlet channel to meet the compensation of the air inlet area of the range hood air inlet channel, in this embodiment, the noise reduction device has at least two auxiliary air inlet channels, and the air inlet area of the auxiliary air inlet channel in the range hood air inlet channel is increased by adjusting the air inlet area of the auxiliary air inlet channel one by one. For example, the noise reduction device of this embodiment has N auxiliary air inlet channels described above, N≥2; the N auxiliary air inlet channels are arranged in an array, and the numbers of the N auxiliary air inlet channels are 1st auxiliary air inlet channel, 2nd auxiliary air inlet channel, …, N-1st auxiliary air inlet channel and Nth auxiliary air inlet channel; when it is determined that the air inlet area of the auxiliary air inlet channel needs to be increased, the 1st auxiliary air inlet channel is opened first according to a preset order to compensate for the air inlet area of the range hood air inlet channel; when it is determined again that the air inlet area of the auxiliary air inlet channel needs to be increased after the 1st auxiliary air inlet channel is opened, the 2nd auxiliary air inlet channel is opened again to compensate for the air inlet area of the range hood air inlet channel; in this way, the auxiliary air inlet channels are opened one by one according to the determination. Of course, according to actual needs, the air inlet areas corresponding to the auxiliary air inlet channels of the noise reduction device after being opened can be completely the same or not completely the same.

[0062] This embodiment provides a readable storage medium. Specifically, the readable storage medium stores a computer program, and the computer program is executed by a processor to implement the range hood noise reduction method described above.

[0063] This embodiment also provides a range hood noise reduction mechanism for implementing the range hood noise reduction method described above. Specifically, as shown in Figure 2 and Figure 3 The range hood noise reduction mechanism of this embodiment includes a smoke exhaust resistance detection device 21, a fan 22, a noise detection device 23, a noise reduction device 24 and a controller 26. The fan 22 is arranged in the range hood 1, the noise reduction device 24 is arranged in the air inlet channel of the range hood 1 and located above the range hood air inlet 10, the noise reduction device 24 has a plurality of auxiliary air inlet channels 25 whose air inlet areas can be adjusted under control, and the controller 26 is connected with the smoke exhaust resistance detection device 21, the fan 22, the noise detection device 23 and the noise reduction device 24 respectively. Among them, the smoke exhaust resistance detection device 21 is responsible for detecting the smoke exhaust resistance value of the range hood 1 after starting; the noise detection device 23 is responsible for detecting the noise value at the air inlet 10 of the range hood 1; the controller 26 is responsible for processing according to the data detected by the smoke exhaust resistance detection device 212 and the noise detection device 23, and controlling the fan 22, the rotating speed and adjusting the air inlet area of the auxiliary air inlet channel 25 in the range hood air inlet channel respectively.

[0064] It should be noted that in this embodiment, the auxiliary air inlet channel 25 comprises a noise elimination cavity 251, sound absorbing material, a valve plate 252 and a magnetic attraction device 253 with controllable magnetic attraction force; the noise elimination cavity 251 is formed with a noise elimination hole 250, the lower end opening of the noise elimination cavity 251 is arranged close to the upper end of the air inlet 10 of the range hood, and the upper end opening of the noise elimination cavity 251 is arranged close to the upper end of the air inlet channel of the range hood; the sound absorbing material is arranged in the noise elimination cavity 251; the valve plate 252 is arranged at the lower end opening of the noise elimination cavity 251 to open or close the lower end opening of the noise elimination cavity 251. One end of the valve plate 252 is a free end, and the other end of the valve plate 252 is a fixed end, and the fixed end is fixed by an elastic component 254. The magnetic attraction device 253 is arranged at the edge of the lower end opening of the corresponding noise elimination cavity 251 (not shown in the figure) to magnetically attract the free end of the valve plate.

[0065] The valve plate 252 herein is an iron valve plate that can be magnetically attracted, the magnetic attraction device 252 is connected to the controller 26, and then the opening or closing of the lower end opening of the noise elimination cavity 251 by the valve plate 252 can be controlled by adjusting the magnetic attraction force of the magnetic attraction device 252 on the valve plate 252. After the magnetic attraction force of the magnetic attraction device 252 on the valve plate 252 disappears, the valve plate 252 moves back to the original position under the action of the elastic component, thereby closing the lower end opening of the noise elimination cavity 251.

[0066] According to actual control needs, the magnetic attraction device 253 in this embodiment is a controllable electromagnet. According to actual needs for adjusting the air inlet area, for each auxiliary air inlet channel, a required number of valve plates can be arranged, for example, the valve plate arrangement mode shown in Figure 3 and Figure 6 , so that more accurate adjustment of the air inlet area of the auxiliary air inlet channel can be achieved.

[0067] This embodiment also provides a range hood. The range hood comprises the range hood noise reduction mechanism described above.

[0068] Although the preferred embodiments of the present application have been described in detail above, it should be understood that various modifications and changes can be made by those skilled in the art without departing from the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method of noise reduction for a range hood, the method comprising: The method comprises the following steps: Step 1, detecting the exhaust resistance value of the exhaust hood after starting; wherein the air inlet channel of the exhaust hood is provided with a noise reduction device, and the noise reduction device has an auxiliary air inlet channel capable of adjusting the size of the air inlet area under control; Step 2, making a judgment according to the detected exhaust resistance value: When the exhaust resistance value is less than or equal to the preset exhaust resistance threshold, step 1 is entered; otherwise, the fan speed of the exhaust hood is increased, and step 3 is entered; Step 3, detecting the noise value at the air inlet of the exhaust hood; Step 4, making a judgment according to the detected noise value at the air inlet: When the noise value at the air inlet is less than or equal to the preset noise threshold, step 1 is entered; otherwise, step 5 is entered; Step 5, increasing the air inlet area of the auxiliary air inlet channel in the air inlet channel of the exhaust hood and reducing the fan speed of the exhaust hood, and entering step 6; Step 6, detecting the noise value at the air inlet of the exhaust hood again, and making a judgment according to the detected noise value at the air inlet: When the noise value at the air inlet is less than or equal to the preset noise threshold, step 7 is entered; otherwise, step 5 is entered; Step 7, detecting the exhaust resistance value of the exhaust hood again, and making a judgment according to the detected exhaust resistance value: When the exhaust resistance value is less than or equal to the preset exhaust resistance threshold and the current state of the exhaust resistance value lasts for more than or equal to the preset time, the air inlet area of the exhaust hood is restored to the initial state before the air inlet area of the auxiliary air inlet channel is increased; otherwise, the air inlet area of the exhaust hood is maintained in the current state.

2. The range hood noise reduction method of claim 1, wherein, The air inlet area of the auxiliary air inlet channel is adjusted by the opening and closing of a valve plate controlled by a magnetic force.

3. The range hood noise reduction method of claim 2, wherein, The noise reduction device has at least two auxiliary air inlet channels, and the air inlet area of the auxiliary air inlet channel in the air inlet channel of the exhaust hood is increased by adjusting the air inlet area of the auxiliary air inlet channel one by one.

4. A readable storage medium having stored thereon a computer program, characterized in that The computer program is executed by a processor to realize the exhaust hood noise reduction method of any one of claims 1-3.

5. A mechanism for reducing the noise of a range hood, which implements the method for reducing the noise of a range hood according to claim 3, characterized in that, It comprises: exhaust resistance detection device (21) for detecting the exhaust resistance value of the exhaust hood (1) after starting; fan (22) provided in the exhaust hood (1); noise detection device (23) for detecting the noise value at the air inlet (10) of the exhaust hood (1); noise reduction device (24) provided in the air inlet channel of the exhaust hood (1) and located above the air inlet (10) of the exhaust hood; wherein the noise reduction device (24) has at least one auxiliary air inlet channel (25) capable of adjusting the size of the air inlet area under control; controller (26) with a timer, the controller (26) is connected with the exhaust resistance detection device (21), the fan (22), the noise detection device (23) and the noise reduction device (24) respectively, and makes a judgment according to the data detected by the exhaust resistance detection device (21) and the noise detection device (23), and controls the fan (22), the speed and the air inlet area of the auxiliary air inlet channel (25) in the air inlet channel of the exhaust hood respectively.

6. The noise reduction mechanism of claim 5, wherein, The auxiliary air inlet channel (25) comprises: A noise elimination cavity (251) is formed with a noise elimination hole (250); wherein the lower end opening of the noise elimination cavity (251) is arranged close to the upper end of the air inlet (10) of the range hood, and the upper opening of the noise elimination cavity (251) is arranged close to the upper end of the air inlet channel of the range hood; A sound absorbing material is arranged in the noise elimination cavity (251); A valve plate (252) is arranged at the lower end opening of the noise elimination cavity (251); A magnetic attraction device (253) with controllable magnetic attraction force is connected to the controller (26), and the opening or closing of the lower end opening of the noise elimination cavity (251) is controlled by adjusting the magnetic attraction force on the valve plate (252).

7. The noise reduction mechanism of claim 6, wherein, The magnetic attraction device (253) is an electromagnet.

8. A range hood, characterized by The range hood is applied with the noise elimination mechanism according to any one of claims 5-7.

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