CN216307911U - Range hood with noise reduction function - Google Patents

Abstract

The utility model relates to a range hood with noise reduction function, comprising: a casing having an air inlet; the rectifying plate is arranged below the shell in a lifting mode relative to the shell, and an air inlet channel for allowing smoke to enter the air suction inlet from the outside is formed between the rectifying plate and the shell; still including locating the device of making an uproar that falls in the casing, should fall the device of making an uproar and include: the noise reduction plate is fixed relative to the machine shell, and noise reduction holes are distributed on the noise reduction plate; the movable plate and the noise reduction plate define a noise reduction cavity communicated with the noise reduction hole together, the movable plate is linked with the rectification plate and can move relative to the noise reduction plate under the driving of the rectification plate so as to change the volume of the noise reduction cavity. Thereby the fly leaf can fall the board removal of making an uproar relatively under the drive of cowling panel and change the volume of falling the chamber of making an uproar, from this for fall the sound absorption characteristic in chamber of making an uproar and can adjust according to range hood's amount of wind, strengthened noise reduction effect, improved user experience.

Description

Range hood with noise reduction function

Technical Field

The utility model relates to the technical field of kitchen appliances, in particular to a range hood with a noise reduction function.

Background

The range hood is a kitchen appliance for purifying the kitchen environment, which works by utilizing the fluid dynamics principle, and generates negative pressure suction force to suck oil smoke through the operation of a centrifugal fan arranged in the range hood so as to discharge the oil smoke to the outside. In the prior art, in order to improve the oil smoke absorption effect of the range hood, a rectifying plate is arranged at the air inlet cavity at the front end of the range hood, and after contacting the rectifying plate, smoke can be attached to the rectifying plate and absorbed into the range hood due to the wall attachment effect, so that the gathering effect is enhanced, and the escape of the smoke is reduced. For further promoting range hood's oil absorption cigarette effect, set up the cowling panel into liftable formula, at the cigarette machine during operation, reduce the position of cowling panel, make the cowling panel more press close to the smoke source, make the flue gas contact the cowling panel in advance, simultaneously for guaranteeing the oil absorption cigarette effect, the wind speed of cigarette machine air intake can not reduce, consequently need promote the amount of wind of cigarette machine. Because the cowling panel descends, range hood's air inlet area increases, if the amount of wind of cigarette machine keeps unchangeable, then the air speed of intaking can reduce, and the fall can make the oil absorption cigarette effect worsen. The problem brought by the increase of the air volume of the smoke machine is the increase of the noise of the smoke machine, which is unfavorable for the user experience.

Therefore, the prior patent application of the applicant provides various noise reduction solutions, one noise reduction solution is that, for example, chinese invention patent application with application number CN201810205619.4 (publication number CN110274270A) discloses a noise reduction type range hood, which is provided with a noise reduction device with a noise reduction cavity on a fan cover plate at the front side of a fan frame, wherein the noise reduction device can move back and forth relative to a noise reduction pore plate under the drive of a cover plate component driving mechanism to adjust the volume size of the noise reduction cavity. According to the Helmholtz resonance principle, the resonance frequency of the noise reduction cavity can be the same as or matched with the wind noise frequency generated by different gears of the range hood, and the stepless noise reduction of the range hood can be realized by the stepless regulation of the volume of the noise reduction cavity.

Another noise reduction scheme is a noise reduction structure of a fan guide plate disclosed in chinese patent application No. CN201810097511.8 (publication No. CN110094367A), which is a noise reduction cavity with adjustable volume formed on the fan guide plate by matching a fixed plate and a movable plate, wherein the noise reduction cavity is driven by a driving mechanism to move relative to the fixed plate, and a partition plate moves synchronously with the movable plate and further changes the volume of the noise reduction cavity, so that the resonance frequency of the noise reduction cavity is the same as or matched with the wind noise frequency generated by different gears of the range hood, thereby realizing frequency conversion noise reduction of the fan guide plate and further reducing the working noise of the fan.

First, the volume of the noise reduction cavity in the noise reduction scheme needs to be additionally provided with a driving mechanism for driving the cover plate assembly or the movable plate, the space in the internal flow channel of the range hood is limited, too many parts are arranged, the inside of the casing is too crowded, and the smoothness of smoke flowing is affected. Secondly, the existing noise reduction scheme is that a noise reduction cavity with adjustable volume is arranged at a fan cover plate of a fan frame or a guide plate of a centrifugal fan, the noise reduction processing is carried out at the rear end region of a flue gas channel in both the fan cover plate and the guide plate, and the effective noise reduction processing is not considered in an inlet region adjacent to the flue gas channel, so that the noise reduction effect is limited, and the use experience of a user is reduced.

Therefore, the existing range hood needs to be further improved.

SUMMERY OF THE UTILITY MODEL

The first technical problem to be solved by the utility model is to provide a range hood with a noise reduction function, which can be linked with the lifting process of a rectifying plate, avoid over-crowding in a machine shell and further improve the smoothness of smoke flow, aiming at the current situation of the prior art.

The second technical problem to be solved by the utility model is to provide a range hood with a noise reduction function, which can perform noise reduction treatment matched with the air volume in the position adjacent to an air suction inlet area, aiming at the current situation of the prior art.

The technical scheme adopted by the utility model for solving the first technical problem is as follows: a range hood with noise reduction function comprises:

a casing having an air inlet;

the rectifying plate is arranged below the shell in a lifting mode relative to the shell, and an air inlet channel for allowing smoke to enter the air suction opening from the outside is formed between the rectifying plate and the shell;

still including locating the device of making an uproar falls in the casing, should fall the device of making an uproar and include:

the noise reduction plate is fixed relative to the machine shell, and noise reduction holes are distributed on the noise reduction plate;

the movable plate, with fall the board of making an uproar inject jointly with fall the chamber of making an uproar that the hole communicates falls, the movable plate with the cowling panel links mutually, and can be in drive of cowling panel down relatively fall the board removal of making an uproar thereby change fall the volume in the chamber of making an uproar.

In order to drive fly leaf and cowling panel synchronous movement, still include lift drive arrangement, this lift drive arrangement includes driving piece and connecting rod, the driving piece is connected on the casing, the first end of connecting rod with the power take off end transmission of driving piece is connected, the second end with the cowling panel transmission is connected, thereby can drive the cowling panel reciprocates, it establishes to fall to make an uproar the board encloses outside the connecting rod to have vertical extension, and in the open activity chamber in lower part, the fly leaf with the connecting rod transmission is connected, and can be in with sliding about the ability the restraint activity intracavity. The structural design that the board of will making an uproar encloses and establishes outside the connecting rod also can effectively utilize casing inner space to a certain extent, avoids each part too crowded in the casing, influences the smooth and easy nature that the inside flue gas of casing flows.

In order to ensure the noise reduction effect, the moving direction of the movable plate is opposite to the moving direction of the rectifying plate. The rectifying plate moves downwards, the air volume of the range hood is increased, the rotating speed of the impeller of the centrifugal fan in the range hood needs to be increased, the peak frequency of the outward radiated noise of the impeller is increased, the movable plate moves upwards synchronously at the moment, the volume of the noise reduction cavity is reduced, the resonance frequency of the noise reduction cavity is increased, the noise reduction characteristic of the noise reduction device is matched with the air volume of the current range hood, and a better noise reduction effect is obtained. Similarly, when the rectifying plate moves upwards, the air quantity of the range hood is correspondingly reduced, the rotating speed of the impeller of the centrifugal fan in the range hood needs to be reduced, the peak frequency of the outward radiated noise is reduced, the movable plate moves downwards synchronously at the moment, the volume of the noise reduction cavity is increased, the resonance frequency of the noise reduction cavity is reduced, the noise reduction characteristic of the noise reduction device is matched with the air quantity of the current range hood, and a better noise reduction effect is obtained.

In order to guarantee the synchronous motion of fly leaf and cowling panel to and simplify the lifting drive device and consider, the driving piece is driving motor, the connecting rod be with driving motor's power output shaft's two-way lead screw, this two-way lead screw have the screw thread revolve to opposite first screw thread section and second screw thread section, the back of cowling panel has the first connecting post that upwards extends, first connecting post has the first screw hole that the axial was seted up, the first screw thread section of two-way lead screw with insert and establish in the first screw hole, the second screw thread section with the fly leaf transmission is connected, thereby drives the cowling panel and the fly leaf removes in opposite directions or removes dorsad.

In order to limit the movable plate and the rectifying plate in the circumferential direction, prevent the movable plate and the rectifying plate from rotating in the up-and-down moving process and ensure the moving stability of the movable plate and the rectifying plate, one of the inner peripheral wall of the noise reduction plate and the outer peripheral wall of the movable plate is provided with a first sliding groove, the other one of the inner peripheral wall of the noise reduction plate and the outer peripheral wall of the movable plate is provided with a first sliding block matched with the first sliding groove, the movable plate is provided with a second connecting column extending upwards, the second connecting column is provided with a second threaded hole which is axially arranged and through which a second threaded section of the bidirectional screw rod is arranged, the bottom of the movable plate is provided with an insertion hole part which is communicated with the second threaded hole and into which the first connecting post of the rectifying plate extends, one of the outer peripheral wall of the first connecting column and the inner wall of the inserting hole part is provided with a second sliding groove, and the other one of the outer peripheral wall of the first connecting column and the inner wall of the inserting hole part is provided with a second sliding block matched with the second sliding groove.

In order to fix the driving part and the noise reduction device, a support frame is arranged in the machine shell, and the driving part and the noise reduction plate are connected to the support frame.

The technical scheme adopted by the utility model for solving the second technical problem is as follows: the whole body of the noise reduction plate is in a cylindrical shape, the noise reduction holes are arranged on the annular wall of the noise reduction plate, a gap is formed between the noise reduction plate and the inner wall of the casing to serve as a flue gas flow passage for flue gas to pass through, and the flue gas flow passage is communicated with the air suction opening.

Compared with the prior art, the utility model has the advantages that: the movable plate of the noise reduction device is linked with the rectifying plate, and when the rectifying plate moves up and down, the movable plate can move relative to the noise reduction plate under the driving of the rectifying plate so as to change the volume of the noise reduction cavity, so that the sound absorption characteristic of the noise reduction cavity can be adjusted according to the air volume of the range hood, the noise reduction effect is enhanced, and the user experience is improved. Especially, the regulation of the size of the cavity of making an uproar falls is driven through the cowling panel lift, therefore need not to increase extra actuating mechanism as among the prior art, avoids excessively crowded in the casing, and then has improved the smooth and easy nature of flue gas flow, and on the other hand has reduced actuating mechanism's quantity, has also saved manufacturing cost.

Drawings

Fig. 1 is a schematic perspective view of a range hood according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of a range hood according to another embodiment of the present invention;

FIG. 3 is a schematic perspective view of the blower housing and blower system of FIG. 1 without the blower housing and blower system;

FIG. 4 is a schematic perspective view of FIG. 3 with the fume collecting hood omitted;

FIG. 5 is an exploded view of FIG. 4;

FIG. 6 is an exploded view from another angle of FIG. 4;

fig. 7 is a vertical cross-sectional view of the extractor hood according to the embodiment of the present invention along the left-right direction (the rectifying plate is moved upward to a high position);

fig. 8 is a vertical cross-sectional view of the extractor hood according to the embodiment of the present invention along the left-right direction (the rectifying plate is moved down to the low position state).

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration and are not to be construed as limiting, for example, because the disclosed embodiments of the present invention may be oriented in different directions, "lower" is not necessarily limited to a direction opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Referring to fig. 1 to 8, a range hood with a noise reduction function includes a housing 10, a fan system 15, a rectifying plate 20, a lifting driving device, and a noise reduction device 30. The housing 10 includes a fan frame 11 and a fume collecting hood 12 connected to a bottom of the fan frame 11, and the fume collecting hood 12 has a suction opening 120 at a bottom thereof. The fan system 15 is disposed in the fan frame 11 and used for providing negative pressure for sucking and exhausting oil smoke.

Referring to fig. 1 and 2, the rectifying plate 20 is disposed below the casing 10 and connected to the casing 10 through a lifting driving device, so as to achieve lifting adjustment relative to the casing 10. The rectifying plate 20 further has a gap with the casing 10, and the gap forms an air inlet passage 200 for allowing the smoke to enter the air inlet 120 from the outside.

Referring to fig. 5 and 6, the lifting driving device includes a driving member 41 and a connecting rod 42, the driving member 41 of the embodiment is a driving motor, and the driving motor is connected to the inner wall of the housing 10 through a supporting frame 14 (see fig. 3 in detail). The connecting rod 42 is preferably a bidirectional lead screw, and the upper end (i.e., the first end) of the bidirectional lead screw is connected to the output shaft of the driving motor so as to be rotated by the driving motor. The lower end (second end) of the bidirectional screw is in transmission connection with the rectifying plate 20, so that the rectifying plate 20 can be driven to move up and down. Specifically, the bidirectional screw rod has a first threaded section 421 and a second threaded section 422 with opposite thread directions along the length direction thereof, the back of the rectifying plate 20 has a first connecting column 21 extending upwards, the first connecting column 21 has a first threaded hole 211 opened axially, wherein the first threaded section 421 of the bidirectional screw rod is inserted into the first threaded hole 211 of the first connecting column 21. More specifically, the first connecting column 21 of the current plate 20 is further limited in the circumferential direction by a limiting structure (specifically described below), so as to prevent the bidirectional screw rod from rotating during the up-and-down movement of the current plate 20.

With continued reference to fig. 5 and 6, the noise reducer 30 is disposed in the casing 10, and specifically includes a noise reduction plate 31 and a movable plate 32. In this embodiment, the noise reduction plate 31 is a cylindrical structure enclosed outside the bidirectional screw, the top of the cylindrical structure is connected to the support frame 14, and the cylindrical structure has a vertically extending movable cavity 312 with an opening at the lower part, and the annular wall of the noise reduction plate 31 is provided with noise reduction holes 310 communicated with the movable cavity 312.

Referring to fig. 6, the movable plate 32 has a second connecting rod 322 extending upward, and the second connecting rod 322 has a second threaded hole 3221 opened axially for the second threaded section 422 of the bidirectional screw to pass through. Therefore, the movable plate 32 of the present embodiment can be in transmission connection with the second threaded end of the bidirectional screw, and can slide up and down in the movable cavity 312 under the driving of the bidirectional screw. Wherein the shape of the movable plate 32 substantially corresponds to the shape of the cross-section of the movable chamber 312, whereby the movable plate 32 and the noise reduction plate 31 together define the noise reduction chamber 300 communicating with the noise reduction holes 310. A gap is formed between the noise reduction plate 31 of the present embodiment and the inner wall of the casing 10, the gap is a flue gas channel 13 for passing flue gas, and the flue gas channel 13 is communicated with the air suction opening 120. The noise reduction device 30 of the present embodiment performs noise reduction processing at a position adjacent to the air suction opening 120, so as to ensure the noise reduction effect at this position.

Because the screw thread directions of the first screw thread section 421 and the second screw thread section 422 of the bidirectional screw thread are opposite, the bidirectional screw thread can drive the rectifying plate 20 and the movable plate 32 to move towards or away from each other in the rotating process driven by the driving motor. Wherein, when driving motor moved, the cowling panel 20 and the movable plate 32 of this embodiment can move simultaneously (also be the movable plate 32 with the cowling panel 20 links mutually), when realizing cowling panel 20 lift adjustment, also correspond the volume that the chamber 300 of making an uproar falls in the change, from this for fall the sound absorption characteristic in chamber 300 of making an uproar and can adjust according to range hood's amount of wind, strengthened the noise reduction effect, improved user experience.

According to the Helmholtz resonance principle, the resonance frequency is calculated by

Wherein f is the resonance frequency of the noise reduction cavity 300, c is the sound velocity in the air, s is the area of the noise reduction hole 310 of the noise reduction cavity 300 and V is the volume of the noise reduction cavity 300, and L is the effective neck length of the noise reduction hole 310. From this, it can be seen that, when the other parameters are not changed, the volume of the noise reduction chamber 300 is increased and the resonance frequency is decreased, whereas, the volume of the noise reduction chamber 300 is decreased and the resonance frequency is increased. By utilizing the helmholtz resonance noise reduction principle, the air columns in the noise reduction holes 310 and the air in the noise reduction cavity 300 form an elastic resonance system, when partial noise frequency of the range hood is the same as the natural frequency of the resonance system, the air columns in the noise reduction holes 310 resonate and violently rub against the hole wall, and the friction enables sound energy to be converted into heat energy, so that the purpose of noise reduction is achieved, and the volume of the cavity behind the holes is used for controlling the resonance frequency of a sound absorption peak value.

Under the cooking condition of large oil smoke amount, the range hood is switched to a strong suction gear, the rectifying plate 20 moves downwards, the air volume of the range hood is increased, the rotating speed of the impeller of the centrifugal fan in the range hood is increased, the peak frequency of outward radiated noise of the impeller is increased, at the moment, the movable plate 32 moves upwards synchronously, the volume of the noise reduction cavity 300 is reduced, the resonance frequency of the noise reduction cavity 300 is increased, the noise reduction characteristic of the noise reduction device 30 is matched with the air volume of the current range hood, and a better noise reduction effect is obtained, which is shown in detail in fig. 8. Similarly, under the cooking condition of small oil smoke amount, the range hood switches to the weak suction gear, the rectifying plate 20 moves upwards, the air amount of the range hood correspondingly decreases, the rotating speed of the impeller of the centrifugal fan in the range hood decreases, the peak frequency of the outward radiated noise of the impeller decreases, the movable plate 32 moves downwards synchronously at this time, the volume of the noise reduction cavity 300 increases to reduce the resonance frequency of the noise reduction cavity 300, so that the noise reduction characteristic of the noise reduction device 30 is matched with the air amount of the current range hood, and a better noise reduction effect is obtained, which is shown in detail in fig. 7.

The embodiment is a structural design that the noise reduction plate 31 is surrounded outside the connecting rod 42, and the internal space of the casing 10 can be effectively utilized to a certain extent, so that the situation that parts in the casing 10 are too crowded and the flowing smoothness of the smoke in the casing 10 is influenced is avoided.

Referring to fig. 5 and 6, the inner peripheral wall of the noise reduction plate 31 of the present embodiment has a first sliding block 311 protruding inward in the radial direction and extending in the up-down direction, the outer peripheral wall of the movable plate 32 has a first sliding slot 320 matching with the first sliding block 311, and the movable plate 32 can realize the limit in the circumferential direction and the guiding function in the up-down direction through the sliding fit between the first sliding block 311 and the first sliding slot 320. Specifically, the first sliding blocks 311 of the present embodiment have two blocks, which are oppositely disposed on the inner peripheral wall of the noise reduction plate 31, and correspondingly, the first sliding grooves 320 also have two blocks, which are disposed on two opposite sides of the movable plate 32.

The bottom of the movable plate 32 is provided with an insertion hole portion 321 communicated with the second threaded hole 3221, the radial dimension of the insertion hole portion 321 is larger than the radial dimension of the second threaded hole 3221, so that a bidirectional screw rod can pass through the insertion hole portion, in particular, the first connection column 21 of the rectification plate 20 can extend into the insertion hole portion, specifically, the outer peripheral wall of the first connection column 21 is provided with a second sliding groove 210 extending in the up-down direction, correspondingly, the inner wall of the insertion hole portion 321 is provided with a second sliding block 3220 protruding inwards in the radial direction and extending in the up-down direction, and the rectification plate 20 can realize the limiting in the circumferential direction and the guiding effect in the up-down direction through the sliding fit between the second sliding groove 210 of the first connection column 21 and the second sliding block 3220 of the movable plate 32. Specifically, the second sliders 3220 of the present embodiment have two opposite sides disposed on the inner peripheral wall of the insertion hole portion 321 of the movable plate 32, and correspondingly, the second sliding grooves 210 have two opposite sides disposed on the first connecting column 21.

In a preferable scheme, a plane formed between the two first sliding grooves 320 (the first sliders 311) and a plane formed between the two second sliding grooves 210 (the second sliders 3220) of the present embodiment are substantially located on the same plane, thereby ensuring stability of the up-and-down movement of the rectifying plate 20 and the movable plate 32.

Claims (7)

1. A range hood with noise reduction function comprises:

a casing (10) having an air inlet (120);

the rectifying plate (20) is arranged below the machine shell (10) in a lifting mode relative to the machine shell (10), and an air inlet channel (200) for enabling smoke to enter the air suction opening (120) from the outside is formed between the rectifying plate and the machine shell (10);

the noise reduction device is characterized by further comprising a noise reduction device (30) arranged in the machine shell (10), wherein the noise reduction device (30) comprises:

the noise reduction plate (31) is fixed relative to the machine shell (10), and noise reduction holes (310) are distributed on the noise reduction plate;

the movable plate (32) and the noise reduction plate (31) jointly define a noise reduction cavity (300) communicated with the noise reduction hole (310), the movable plate (32) is linked with the rectifying plate (20) and can be driven by the rectifying plate (20) to move relative to the noise reduction plate (31) so as to change the volume of the noise reduction cavity (300).

2. The range hood with the noise reduction function according to claim 1, further comprising a lifting driving device, wherein the lifting driving device comprises a driving member (41) and a connecting rod (42), the driving member (41) is connected to the housing (10), a first end of the connecting rod (42) is in transmission connection with a power output end of the driving member (41), a second end of the connecting rod is in transmission connection with the rectifying plate (20), so as to drive the rectifying plate (20) to move up and down, the noise reduction plate (31) is enclosed outside the connecting rod (42) and has a vertically extending movable cavity (312) with an opening at a lower portion, and the movable plate (32) is in transmission connection with the connecting rod (42) and can be constrained in the movable cavity (312) in a vertically sliding manner.

3. The range hood with noise reduction function according to claim 2, wherein: the moving direction of the movable plate (32) is opposite to the moving direction of the rectifying plate (20).

4. The range hood with noise reduction function according to claim 3, wherein: the driving part (41) is driving motor, connecting rod (42) for with the two-way lead screw that driving motor's power take off hub is connected, this two-way lead screw have screw thread revolve to opposite first screw thread section (421) and second screw thread section (422), the back of cowling panel (20) has first connecting post (21) that upwards extends, first connecting post (21) have first screw hole (211) that the axial was seted up, two-way lead screw's first screw thread section (421) with insert and establish in first screw hole (211), second screw thread section (422) with fly leaf (32) transmission is connected, thereby drives cowling panel (20) and fly leaf (32) move or dorsad.

5. The range hood with noise reduction function according to claim 4, wherein: one of the inner peripheral wall of the noise reduction plate (31) and the outer peripheral wall of the movable plate (32) is provided with a first sliding groove (320), the other one of the inner peripheral wall of the noise reduction plate and the outer peripheral wall of the movable plate (32) is provided with a first sliding block (311) matched with the first sliding groove (320), the movable plate (32) is provided with a second connecting column (322) extending upwards, the second connecting column (322) is provided with a second threaded hole (3221) which is axially arranged and through which a second threaded section (422) of the bidirectional screw rod is arranged, the bottom of the movable plate (32) is provided with a jack part (321) which is communicated with the second threaded hole (3221) and into which the first connecting column (21) of the rectifying plate (20) extends, one of the outer peripheral wall of the first connecting column (21) and the inner wall of the jack part (321) is provided with a second sliding groove (210), and the other one is provided with a second sliding block (3220) matched with the second sliding groove (210).

6. The range hood with noise reduction function according to claim 2, wherein: the casing (10) is internally provided with a support frame (14), and the driving part (41) and the noise reduction plate (31) are connected to the support frame (14).

7. The range hood with a noise reduction function according to any one of claims 1 to 6, wherein: the whole body of the noise reduction plate (31) is in a cylindrical shape, the noise reduction holes (310) are arranged on the annular wall of the noise reduction plate (31), a gap is formed between the noise reduction plate (31) and the inner wall of the casing (10) to serve as a flue gas flow channel (13) for flue gas to pass through, and the flue gas flow channel (13) is communicated with the air suction opening (120).

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