A fan assembly with noise reduction function, an integrated stove and a noise reduction control method

Abstract

The present invention discloses a fan assembly with a noise reduction function, comprising a fan housing, a fan arranged in the fan housing, and an air duct having an air inlet and an air outlet and connected to the fan housing; at least two layers of silencing substrates are arranged in the air duct, which are spaced from each other and extend along the wind direction in the air duct, and the silencing substrate has a plurality of groups of silencing units continuously arranged along its extension direction, and a control mechanism is provided to control the protrusion degree of at least part of the silencing units relative to the silencing substrate, so that the silencing substrate is in a silencing state, and a plurality of groups of silencing units constitute a waveform structure that offsets noise sound waves. The present invention also discloses an integrated stove having the fan assembly, and a noise reduction control method based on the fan assembly. The beneficial effect of the present invention is that the waveform structure formed by the silencing substrate offsets the noise waveform, thereby achieving the effect of noise regulation.

Description

Technical Field

[0001] The invention relates to a fan assembly with noise reduction function, an integrated stove and a noise reduction control method, and belongs to the technical field of kitchen appliances. Background Art

[0002] As an important part of kitchen appliances, the noise level of integrated stoves is crucial to user experience and product competitiveness.

[0003] In an existing technology for sound insulation and noise reduction of an integrated stove, a cover plate is mainly provided to avoid the noise generated by the operation of a centrifugal fan. This method simply blocks the noise but does not play a role in regulating the noise. In addition, a single structural change cannot allow users to intuitively feel the effectiveness of the sound blocking. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a fan assembly with noise reduction function, an integrated stove and a noise reduction control method, by which the waveform structure formed by the sound-absorbing base layer offsets the noise waveform to achieve the effect of noise regulation.

[0005] The present invention is achieved through the following technical solutions.

[0006] A fan assembly with a noise reduction function comprises a fan housing, a fan arranged in the fan housing, and an air duct having an air inlet and an air outlet and connected to the fan housing; at least two layers of sound-absorbing base layers which are spaced apart from each other and extend along the wind direction in the air duct are arranged in the air duct, a plurality of groups of sound-absorbing units are continuously arranged on the sound-absorbing base layer along its extension direction, and a control mechanism is provided for controlling the protrusion degree of at least part of the sound-absorbing units relative to the sound-absorbing base layer, so that the sound-absorbing base layer is in a sound-absorbing state, and a plurality of groups of the sound-absorbing units constitute a waveform structure for offsetting noise sound waves.

[0007] As a further improvement of the present invention, it also includes a noise collector for identifying the noise in the air duct and forming a signal; the control mechanism includes a control processing component and multiple power components, the control processing component is used to receive the signal sent by the noise collector, and control the power component to drive the silencing unit to move relative to the silencing base layer to change the degree of protrusion.

[0008] As a further improvement of the present invention, the silencer unit can slide and retract along the raised direction relative to the silencer base layer; the power component includes an output shaft arranged on the drive motor and assembled on the drive motor, and the output shaft is connected to at least one silencer unit for driving the silencer unit to slide and retract.

[0009] As a further improvement of the present invention, the silencer unit includes a plurality of silencer convex point structures arranged side by side.

[0010] As a further improvement of the present invention, a first connecting plate and a second connecting plate are respectively arranged in the air duct near the air outlet and away from the air outlet, and the first connecting plate is provided with a ventilation hole corresponding to the air outlet so that the oil smoke passes through the ventilation hole and the air outlet in sequence, and the two ends of the sound-absorbing base layer are respectively connected to the first connecting plate and the second connecting plate.

[0011] As a further improvement of the present invention, at least two layers of supporting parts are provided on the first connecting plate and the second connecting plate, and the two ends of the sound-absorbing base layer are respectively supported on the supporting parts corresponding to the first connecting plate and the second connecting plate.

[0012] As a further improvement of the present invention, a plurality of air holes are arranged on the first connecting plate.

[0013] An integrated stove comprises the fan assembly.

[0014] A noise reduction control method, comprising the steps of:

[0015] Step S1: Detect whether the decibel of noise in the air duct is lower than a first threshold decibel;

[0016] Step S2: If yes, control the muffler base layer to be in a muffler state; if no, detect whether the concentration of the oil smoke entering the fan housing exceeds the threshold concentration;

[0017] Step S3: If yes, control the silencing base layer to be in a silencing state; if no, detect whether the speed of the fan exceeds the set range;

[0018] Step S4: If yes, control the silencing base layer to be in a silencing state; if no, adjust the speed of the fan, and detect whether the decibel of the noise in the air duct is lower than a second threshold decibel, and the second threshold decibel is lower than the first threshold decibel;

[0019] Step S5: If yes, then end the control; if no, then control the mute base layer to be in a mute state.

[0020] As a further improvement of the present invention, the steps for controlling the sound-absorbing base layer in step S2, step S3, step S4, and step S5 include:

[0021] Step S01: Detect whether all the silencing base layers are in a silencing state;

[0022] Step S02: If yes, then end the control; if no, then control one of the mute base layers to be in a mute state;

[0023] Step S03: Detect whether the decibel of the noise in the air duct is lower than the second threshold decibel. If so, end the control; if not, control one of the remaining silencing base layers to put it in a silencing state;

[0024] Step S04: Repeat step S03 until the decibel of the noise in the air duct is lower than the second threshold decibel, or all the silencing base layers are in a silencing state.

[0025] Beneficial effects of the present invention:

[0026] 1. The noise reduction base layer is configured in the air duct, which can greatly eliminate the noise caused by oil smoke, improve the quietness of the fan component during operation, reduce noise pollution in the kitchen environment, and improve the user experience;

[0027] 2. Through the control mechanism, the protrusion degree of the muffler unit relative to the muffler base layer can be controlled, that is, the shape of the waveform structure composed of multiple groups of muffler units can be controlled and adjusted to match and adapt to different noise waves, thereby effectively eliminating noise and achieving noise reduction function;

[0028] 3. By setting at least two layers of silencing base layers, and by using a control mechanism, the silencing units on different silencing base layers can form different waveform structures, so that these multiple and mixed noises can be more thoroughly offset, and have better adaptability for use;

[0029] 4. The setting of the air holes on the first connecting plate, on the one hand, can increase the flow rate of oil smoke in the air duct without affecting the installation and setting of the silencer base layer; on the other hand, a small part of the oil smoke can reduce the impact intensity of the oil smoke on the first connecting plate when passing through the air holes, thereby reducing the noise in the air duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to help understand the purpose and advantages of the present invention, wherein:

[0031] Figure 1 It is a schematic diagram of the overall structure of the fan assembly;

[0032] Figure 2 It is a schematic diagram of the local structure of the sound-absorbing base layer;

[0033] Figure 3 is a schematic diagram of a power assembly;

[0034] Figure 4 is a structural schematic diagram of a first connecting plate;

[0035] Figure 5 Flow chart of the noise reduction control method. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below based on the accompanying drawings and implementation examples.

[0037] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. The words "inside" and "outside" refer to the direction toward or away from the geometric center of a specific component, respectively. They are relative concepts, and therefore may change accordingly according to different locations and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0038] Implementation Case 1:

[0039] A fan assembly, referring to Figure 1-4 , mainly used in integrated stoves, configured as a part of the lower machine of the integrated stove, and its function is to provide negative pressure so that the oil smoke is sucked into the smoke hood 5, and then the oil smoke is discharged through the fan assembly. The fan assembly of this embodiment includes a fan housing 12, a fan 11, and an air duct 13, wherein the fan 11 is arranged in the fan housing 12, the air duct 13 is arranged horizontally and connected to the bottom of the fan housing 12, and the air duct 13 has an air inlet 131 and an air outlet 132, the air inlet 131 is formed at the top of the air duct 13, and the air outlet 132 is formed at one end of the air duct 13.

[0040] In this embodiment, at least two layers of mutually spaced silencing base layers 2 are provided in the air duct 13. The silencing base layer 2 is basically a flat plate-like structure or a sheet-like structure. Its specific shape is based on the structure of the air duct 13 and is extended along the wind direction in the air duct 13. The silencing base layer 2 is continuously arranged with multiple groups of silencing units 21 along its extension direction. The silencing units 21 can be adjusted relative to the silencing base layer 2 and can change the protrusion degree relative to the silencing base layer 2. The silencing base layer 2 is also provided with a control mechanism for controlling the protrusion degree of at least one silencing unit 21 relative to the silencing base layer 2, so that the silencing base layer 2 is in a silencing state, and multiple groups of silencing units 21 constitute a wave structure, thereby being able to offset noise sound waves.

[0041] In this embodiment, the air duct 13 of the fan assembly has a relatively narrow and long structure, so most of the noise generated by the oil fume is mainly generated in the air duct 13. Therefore, the sound-absorbing base layer 2 used for noise reduction in this embodiment is arranged in the air duct 13, which can greatly eliminate the noise caused by the oil fume, improve the quietness of the fan assembly during operation, reduce noise pollution in the kitchen environment, and improve the user experience.

[0042] In this embodiment, the control mechanism can control the protrusion of the muffler unit 21 relative to the muffler base layer 2, that is, the shape of the waveform structure formed by the multiple groups of muffler units 21 can be controlled to match and adapt to different noise sound waves, so that the noise can be effectively eliminated to achieve the noise reduction function. Obviously, when there is no noise or the noise level is low in the air duct 13, the control mechanism can control the muffler unit 21 to reset.

[0043] It should be noted that when the oil smoke flows from the fan 11 into the air duct 13, its flow direction will change, thus generating noise; due to the relatively narrow and long structure of the air duct 13, the oil smoke will be affected by the inner wall of the air duct 13 during the high-speed flow in the air duct 13, forming turbulence, and the air flow velocity pulsation in the turbulence will also generate noise; when the fan 11 is started, it will vibrate, and under the influence of the vibration of the fan 11, the air duct 13 is also prone to mechanical resonance and thus generating noise. Therefore, the noise in the air duct 13 is relatively complex and the noise sources are diverse. In this embodiment, by setting at least two layers of silencing base layers 2, and by means of a control mechanism, the silencing units 21 on different silencing base layers 2 can form different waveform structures, so that these multiple and miscellaneous noises can be more thoroughly offset, and have better adaptability for use. In addition, due to the different rotation speeds of the fan 11 and the different oil smoke densities, the noise volume will also be different. In this embodiment, the number of required silencing base layers 2 can be reasonably adapted according to the noise volume.

[0044] The fan assembly of this embodiment also includes a noise collector 31, which is used to identify the noise in the air duct 13 and form a signal. The noise collector 31 can be set at the air inlet 131 of the air duct 13, so as to accurately detect the noise condition in the air duct 13. In this embodiment, the control mechanism includes a control processing component 32 and a plurality of power components 33, wherein the control processing component 32 is used to receive the signal sent by the noise collector 31, and control the power component 33 to drive the muffler unit 21 to move relative to the muffler base layer 2, thereby changing the protrusion degree of the muffler unit 21 relative to the muffler base layer 2.

[0045] More specifically, the fan assembly shown in this embodiment is provided with two layers of sound-absorbing base layers 2. The sound-absorbing base layer 2 located on the upper layer, which is closest to the air inlet 131, has a control mechanism that first controls the sound-absorbing unit 21 on this layer to perform the first sound absorption and noise reduction on the noise. If the amount of noise is small or the number of noise sources is small, the sound absorption and noise reduction can be completed by this layer of sound-absorbing base layer 2. If there is still noise, the remaining noise can be absorbed and noise reduced by the sound-absorbing base layer 2 located on the lower layer.

[0046] In this embodiment, the silencer unit 21 passes through the silencer base layer 2, and can slide and retract along the raised direction of the silencer unit 21 relative to the silencer base layer 2. The silencer base layer 2 basically extends in the horizontal direction, and the silencer unit 21 basically slides and retracts up and down. As for the power assembly 33, it includes a drive motor 331 and an output shaft 332, wherein the drive motor 331 is installed on the silencer base layer 2, the output shaft 332 is assembled on the drive motor 331, and the output shaft 332 is connected to at least one silencer unit 21, which can drive the silencer unit 21 to slide and retract so that multiple groups of silencer units 21 can be adjusted to a waveform structure. More specifically, the drive motor 331 is arranged on the bottom surface of the silencer base layer 2, and the silencer unit 21 can pass through the top surface of the silencer base layer 2 and slide and retract along the raised direction for adjustment. In addition, the output shaft 332 can be connected to one silencer unit 21, or it can be connected to multiple silencer units 21 spaced apart from each other. Specifically, a connecting piece can be used to connect multiple silencer units 21 spaced apart from each other, and then connected to the output shaft 332, so that one drive motor 331 can drive multiple silencer units 21 to slide, telescope and adjust, that is, one drive motor 331 can control multiple peaks in the waveform structure.

[0047] In this embodiment, specifically, the control processing component 32 includes a piezoelectric sensor 321 and a drive sensor 322. The noise collector 31 is specifically configured as a sound sensor, which identifies the noise in the air duct 13 and forms a signal. The piezoelectric sensor 321 receives the signal from the noise collector 31, processes the signal and transmits it to the drive sensor 322. The drive sensor 322 finally converts the signal into a motion signal and transmits it to the drive motor 331 to drive the silencing unit 21 to slide and telescope. More specifically, the piezoelectric sensor 321 is installed on the top surface of the silencing base layer 2, and the drive sensor 322 is installed on the bottom surface of the silencing base layer 2.

[0048] In this embodiment, the sound-absorbing unit 21 includes a plurality of sound-absorbing convex point structures 211 arranged side by side, and the side-by-side direction is perpendicular to the extension direction of the sound-absorbing base layer 2 .

[0049] In this embodiment, a first connecting plate 41 and a second connecting plate 42 are provided in the air duct 13, wherein the first connecting plate 41 is close to the air outlet 132, and the second connecting plate 42 is far from the air outlet 132. A through vent 411 is provided in the middle of the first connecting plate 41, and the vent 411 corresponds to the air outlet 132, so that the oil smoke entering the air duct 13 through the air inlet 131 flows along the air duct 13 and sequentially passes through the vent 411 and the air outlet 132. The two ends of the silencing substrate 2 are respectively provided on the first connecting plate 41 and the second connecting plate 42, so that the state of these silencing substrates 2 being provided in the air duct 13 remains stable, so that they can fully and effectively exert their silencing and noise reduction functions.

[0050] In this embodiment, specifically, at least two supporting parts 401 are provided on the first connecting plate 41 and the second connecting plate 42, and the two ends of the sound-absorbing base layer 2 are supported on the corresponding supporting parts 401, respectively, so as to facilitate the installation of the sound-absorbing base layer 2 in the air duct 13. In addition, the two ends of the sound-absorbing base layer 2 and the corresponding supporting parts 401 can be connected by detachable fasteners such as screws to prevent the sound-absorbing base layer 2 from shaking.

[0051] In this embodiment, a plurality of air holes 412 are arranged on the first connecting plate 41. When the oil smoke flows at a high speed in the air duct 13, most of the oil smoke passes through the vents 411, and a small portion of the oil smoke close to the inner wall of the air duct 13 passes through the air holes 412. On the one hand, the setting of the air holes 412 can increase the flow rate of the oil smoke in the air duct 13 without affecting the installation and setting of the silencer base layer 2. On the other hand, when a small portion of the oil smoke passes through the air holes 412, the impact intensity of the oil smoke on the first connecting plate 41 can be reduced, thereby reducing the noise in the air duct 13.

[0052] Implementation Case 2:

[0053] An integrated stove includes a fan assembly, and the fan assembly is shown in Implementation Case 1.

[0054] Implementation Case 3:

[0055] A noise reduction control method. The noise reduction control method of this implementation case is implemented based on the fan component shown in implementation case 1.

[0056] Reference Figure 5 Combined with Figure 1 , the specific steps include:

[0057] Step S1: Detect whether the decibel of noise in the air duct 13 is lower than a first threshold decibel;

[0058] Step S2: If yes, control the muffler base layer 2 to be in a muffler state; if no, detect whether the concentration of the oil smoke entering the fan housing 12 exceeds the threshold concentration;

[0059] Step S3: If yes, control the silencing base layer 2 to be in a silencing state; if no, detect whether the speed of the fan 11 exceeds the set range;

[0060] Step S4: If yes, the silencing base layer 2 is controlled to be in a silencing state; if no, the speed of the fan 11 is adjusted, and the decibel of the noise in the air duct 13 is detected to be lower than the second threshold decibel. The second threshold decibel is lower than the first threshold decibel. The specific adjustment can be made in an automatic adjustment manner, or the user can manually adjust the fan speed by using the sound adjustment knob;

[0061] Step S5: If yes, then the control is ended; if no, then the silencing base layer 2 is controlled to be in a silencing state.

[0062] The noise in the air duct 13 is detected by the noise collector 31 , and the fume concentration of the air inlet fan housing 12 is detected by the fume concentration sensor 51 disposed on the fume collecting hood 5 .

[0063] Through the noise reduction control method of this implementation case, the optimal noise reduction method can be adapted based on the noise level in the air duct 13, the concentration of oil smoke, and the rotation speed of the fan 11, and it is implemented without affecting the normal exhaust work of the fan 11.

[0064] More specifically, in this embodiment, the first threshold decibel is set to 65-75db, preferably to 70db; the second threshold decibel is set to 60-70db, preferably to 68db; the threshold concentration is set to 0.75-0.85mg / m², preferably to 0.8 mg / m².

[0065] For controlling the sound-absorbing base layer 2, in step S2, step S3, step S4, and step S5, the control steps include:

[0066] Step S01: Detect whether all the silencing base layers 2 are in a silencing state;

[0067] Step S02: If yes, then the control is ended, and all the screen indicator lights are turned on to flash; if no, then one of the mute base layers 2 is controlled to be in a mute state, and the corresponding screen indicator light is turned on to flash, indicating that the mute base layer 2 has been turned on to control;

[0068] Step S03: Detect whether the decibel of the noise in the air duct 13 is lower than the second threshold decibel. If so, end the control; if not, control one of the remaining silencing base layers 2 to put it in a silencing state;

[0069] Step S04: Repeat step S03 until the decibel of the noise in the air duct 13 is lower than the second threshold decibel, or all the silencing base layers 2 are in a silencing state.

[0070] Referring to the implementation case 1, the sound-absorbing base layer 2 is set to two layers, and the upper sound-absorbing base layer 2 is controlled first. If the noise reduction requirement cannot be met, the lower sound-absorbing base layer 2 is controlled. If the sound-absorbing base layer 2 is set to three or more layers, the sound-absorbing base layers 2 can be controlled in sequence from top to bottom.

[0071] In addition, the control of the silencer base layer 2 is specifically as follows: the piezoelectric sensor 321 receives the signal from the noise collector 31, transmits the signal to the driving sensor 322 after processing, and the driving sensor 322 finally converts the signal into a motion signal and transmits it to the power component 33 to drive the silencer unit 21.

[0072] Finally, it should be noted that the above implementation cases are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned implementation cases, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned implementation cases, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation cases of the present invention.

Claims

1. A fan assembly with noise reduction function, characterized in that: The invention comprises a fan housing (12), a fan (11) arranged in the fan housing (12), and an air duct (13) having an air inlet (131) and an air outlet (132) and connected to the fan housing (12); at least two layers of sound-absorbing base layers (2) are arranged in the air duct (13) and are spaced from each other and extend along the wind direction in the air duct (13); the sound-absorbing base layer (2) has a plurality of groups of sound-absorbing units (21) arranged continuously along its extension direction, and a control mechanism is provided for controlling the protrusion degree of at least part of the sound-absorbing units (21) relative to the sound-absorbing base layer (2), so that the sound-absorbing base layer (2) is in a sound-absorbing state, and the plurality of groups of sound-absorbing units (21) form a waveform structure for offsetting noise sound waves; the sound-absorbing units (21) include a plurality of sound-absorbing convex point structures (211) arranged side by side.

2. The fan assembly according to claim 1, characterized in that: It also includes a noise collector (31) for identifying the noise in the air duct (13) and generating a signal; the control mechanism includes a control processing component (32) and a plurality of power components (33); the control processing component (32) is used to receive the signal emitted by the noise collector (31) and control the power component (33) to drive the muffler unit (21) to move relative to the muffler base layer (2) to change the degree of protrusion.

3. The fan assembly according to claim 2, characterized in that: The silencer unit (21) can slide and retract relative to the silencer base layer (2) in a convex direction; the power assembly (33) comprises a drive motor (331) arranged on the silencer base layer (2), and an output shaft (332) mounted on the drive motor (331); the output shaft (332) is connected to at least one silencer unit (21) and is used to drive the silencer unit (21) to slide and retract.

4. The fan assembly according to claim 1, characterized in that: A first connecting plate (41) and a second connecting plate (42) are respectively arranged in the air duct (13) near the air outlet (132) and away from the air outlet (132); the first connecting plate (41) is provided with a ventilation hole (411) corresponding to the air outlet (132), so that oil smoke passes through the ventilation hole (411) and the air outlet (132) in sequence; and two ends of the sound-absorbing base layer (2) are respectively arranged on the first connecting plate (41) and the second connecting plate (42).

5. The fan assembly according to claim 4, characterized in that: At least two layers of support parts (401) are provided on the first connecting plate (41) and the second connecting plate (42), and two ends of the sound-absorbing base layer (2) are respectively supported on the support parts (401) corresponding to the first connecting plate (41) and the second connecting plate (42).

6. The fan assembly according to claim 4, characterized in that: A plurality of air holes (412) are arranged on the first connecting plate (41).

7. An integrated stove, characterized in that: Comprising the fan assembly according to any one of claims 1-6.

8. A noise reduction control method for a fan assembly according to any one of claims 1 to 6, characterized in that the steps include: Step S1: Detecting whether the decibel level of noise in the air duct (13) is lower than a first threshold decibel level; Step S2: If yes, then control the muffler base layer (2) to be in a muffler state; if no, then detect whether the concentration of the oil smoke entering the fan housing (12) exceeds a threshold concentration; Step S3: If yes, then control the muffler base layer (2) to be in a muffler state; if no, then detect whether the rotation speed of the fan (11) exceeds a set range; Step S4: If yes, then control the silencing base layer (2) to be in a silencing state; if no, then adjust the rotation speed of the fan (11), and detect whether the decibel of the noise in the air duct (13) is lower than a second threshold decibel, and the second threshold decibel is lower than the first threshold decibel; Step S5: If yes, then the control is terminated; if no, then the mute base layer (2) is controlled to be in a mute state.

9. The noise reduction control method according to claim 8, characterized in that: The steps for controlling the sound-absorbing base layer (2) in step S2, step S3, step S4 and step S5 include: Step S01: Detect whether all the silencing base layers (2) are in a silencing state; Step S02: If yes, then end the control; if no, then control one of the mute base layers (2) to put it in a mute state; Step S03: Detect whether the decibel of the noise in the air duct (13) is lower than a second threshold decibel. If so, end the control; if not, control one of the remaining silencing base layers (2) to put it in a silencing state; Step S04: Repeat step S03 until the decibel level of the noise in the air duct (13) is lower than the second threshold decibel level, or all the silencing base layers (2) are in a silencing state.

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