CN216788750U - Fume exhaust fan - Google Patents

Abstract

The utility model relates to a range hood, comprising: a housing; the fan system is arranged in the shell and comprises a volute, and the volute is provided with an air inlet; the flow guide piece is arranged in the shell, is positioned above the front side of the air inlet of the volute and is used for guiding airflow into the air inlet; the driving mechanism is arranged on the casing, the power output end of the driving mechanism is connected with the flow guide piece, and the driving mechanism can drive the flow guide piece to be close to or far away from the volute, so that the distance between the flow guide piece and the volute is changed. Because the distance between water conservancy diversion spare and the spiral case can be adjusted, therefore can carry out matching water conservancy diversion to different operating mode wind channel flow conditions and fall the noise.

Description

Fume exhaust fan

Technical Field

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

Background

The range hood is a kitchen appliance for purifying the kitchen environment. When the range hood operates, the aerodynamic performance and noise are not only related to the performance of the multi-wing centrifugal fan, but also are restricted and influenced by the space at the front end of the inlet of the fan, wherein under the influence of inertia force, larger air inlet vortexes can be formed at the front side and the rear side of the impeller. According to the conservation of angular momentum, the intensity of the vortex is not easy to attenuate.

At present, a flow guide device is arranged in a fan frame to stabilize the flow and eliminate the vortex. The three-dimensional noise reduction system of sound is inhaled in water conservancy diversion of lampblack absorber that chinese patent application number is 201610738828.6 discloses, it includes the host computer casing, sets up the air duct system in the host computer casing, air duct system includes the fan shell, sets up the fan air intake on the fan shell, with the main water conservancy diversion that is equipped with on the medial surface of the host computer casing that the fan air intake is relative falls the body of making an uproar from top to bottom extending falls, two left and right main water conservancy diversion inclined planes have on the body are fallen in main water conservancy diversion, and the interval between two left and right main water conservancy diversion inclined planes is fallen by the main water conservancy diversion and falls the host computer casing medial surface at the body place and reduce toward fan air intake direction gradually.

However, the applicant finds that, because the range hood is under different working conditions, such as different air volume gears, the vortex intensity at the back of the fan frame is also different, and the distance between the flow guide piece and the volute in the above patent is fixed, the flow guide piece can play a role in rectifying and stabilizing the flow aiming at a specific working condition state, but the problem of adaptation under different air volume gears is not considered, such as the problem of air inlet blockage is caused if the distance between the flow guide piece and the volute is too close in a high gear, and although the purpose of eliminating the vortex is realized, the smoothness of the air flow entering the air inlet of the volute is greatly influenced, and the compensation is not carried out. On the other hand, to the collection petticoat pipe of lower air inlet, its left and right sides is main air inlet region also, if increase the kuppe at fan frame downside, can cause the regional area of overflowing of air inlet to reduce, and then increase loss along the journey, reduce fan performance. And, install the kuppe on the spiral case surface, also can transmit the noise of spiral case to the kuppe, increase on the one hand and spread the noise (solid transaudient efficiency is higher than gaseous), on the other hand also can improve the risk of resonance abnormal sound.

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

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of the prior art and provides a range hood capable of conducting matching flow guiding and noise reduction according to the flow conditions of air ducts under different working conditions.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a range hood, comprising:

a fan frame;

the fan system is arranged in the fan frame and comprises a volute, and the volute is provided with an air inlet;

the flow guide piece is arranged in the fan frame, is positioned above the front side of the air inlet of the volute and is used for guiding airflow into the air inlet;

the driving mechanism is arranged on the fan frame, the power output end of the driving mechanism is connected with the flow guide piece, and the driving mechanism can drive the flow guide piece to be close to or far away from the volute, so that the distance between the flow guide piece and the volute is changed.

Generally speaking, the diversion piece can be moved closer to or away from the volute by way of integral translation or by way of deflection, in order to better divert the incoming flow from below towards the air inlet of the volute, an impeller is arranged in the volute, the diversion piece comprises a diversion plate, the lower part of the diversion plate is rotatably connected to the fan frame by taking a horizontal line perpendicular to the axis of the impeller as a rotation axis, and the power output end of the driving mechanism is connected to the upper part of the diversion plate.

In order to drive the guide plate to rotate, the driving mechanism comprises an electric push rod, the electric push rod is arranged on a top plate of the fan frame and is provided with a power output end capable of reciprocating along a linear direction parallel to the axis of the impeller, the top of the guide plate is provided with a connecting rod extending upwards, and the connecting rod penetrates through the top plate of the fan frame and is rotatably connected with the power output end of the electric push rod.

In order to avoid interference between the linear movement of the electric push rod and the swing between the connecting rods of the guide plates, the driving mechanism further comprises a sliding seat connected with the power output end of the electric push rod, a strip-shaped movable hole which is vertically communicated and extends along the axial direction of the impeller is formed in the sliding seat, and the connecting rods are arranged in the strip-shaped movable hole in a penetrating mode.

In order to avoid the influence of the flow guide piece on the smoothness of the air flow entering the air inlet of the volute, the orthographic projection of the flow guide plate on the vertical plane perpendicular to the axis of the impeller is overlapped with the air inlet of the volute, and the lower part of the flow guide plate is provided with a notch right facing the air inlet.

In order to further reduce noise, the outer periphery of the guide plate is provided with a folded plate formed by bending in the direction away from the air inlet, a sound absorption cavity is defined among the guide plate, the folded plate and the inner wall of the fan frame, and noise reduction holes communicated with the sound absorption cavity are arranged on the guide plate.

As an improvement, the sound absorption cavity is also filled with sound absorption cotton. The noise reduction effect is further improved by the arrangement of the sound absorption cotton.

In order to avoid the larger impact of the incoming flow below on the guide plate and further improve the flow guide effect, the folded plate at the bottom of the guide plate is an arc-shaped plate protruding downwards.

In order to reasonably design the longitudinal length of the guide plate and avoid the influence on incoming flows in other directions (such as the left side and the right side) caused by overlong longitudinal length of the guide plate and avoid a better guide effect which cannot be achieved due to too short longitudinal length of the guide plate, the distance from the axis of the impeller to the top plate of the fan frame is marked as H, the distance from the bottom edge of the guide plate to the top plate of the fan frame is marked as H1, and H1 is not less than 0.6H and not more than 0.9H.

In order to ensure that the airflow can smoothly enter the volute air inlet, the diameter of the volute air inlet is D, the notch of the guide plate is arc-shaped, the diameter of the notch is D1, wherein D is not less than D1 and not more than 1.23D.

Compared with the prior art, the utility model has the advantages that: the distance between the flow guide piece and the volute can be adjusted, so that matching flow guide and noise reduction can be performed according to the flow conditions of the air ducts under different working conditions. When the range hood is in a low gear, the fluid on the rear side of the range hood flows less, and a large amount of gas forms a vortex behind the fan frame, so that the flow guide piece can be adjusted to be close to the volute, and the flow loss caused by the cyclone is reduced. When the range hood is in a high gear, the overflowing amount of the fan is large at the moment, the air inlet of the volute tends to attract fluid from all the positions around, and at the moment, the adjustable flow guide piece is far away from the volute, so that the problem of air inlet blockage caused by too short distance between the flow guide piece and the volute is avoided. In the preferred scheme, form the sound absorbing cavity between the inner wall of guide plate and fan frame, sound absorbing material such as amortization cotton is packed to inside to set up the hole of making an uproar on the guide plate, therefore, on the basis of carrying out effective water conservancy diversion in order to realize carrying out the air current, promoted the noise reduction effect.

Drawings

FIG. 1 is a schematic perspective view of an embodiment of the present invention;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a vertical cross-sectional view of FIG. 1 taken along the front-to-rear direction;

FIG. 4 is a rear view of FIG. 1 with the blower housing omitted;

FIG. 5 is a front view of a baffle member according to an embodiment of the present invention;

FIG. 6 is a schematic perspective view of a flow guide member according to an embodiment of the present invention;

fig. 7 is a schematic perspective view of a back surface of a flow guide member according to an embodiment of the utility model.

Detailed Description

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

Directional terms such as "front," "rear," "upper," "lower," "left," "right," "side," "top," "bottom," and the like are used in the description and claims of the present invention to describe various example structural portions and elements of the utility model, but are used herein for convenience of description only and are to be determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the present invention may be oriented in different directions, the directional terms are used for descriptive purposes and are not to be construed as limiting, e.g., "upper" and "lower" are not necessarily limited to directions opposite to or coincident with the direction of gravity.

Referring to fig. 1-7, a range hood includes a fan frame 11, a fan system 20, and a deflector 30. The fan system 20 is disposed in the fan frame 11 and is used for providing negative pressure for sucking and exhausting oil smoke. The fan system 20 includes a volute 21, an impeller 22 and a motor 23, wherein the impeller 22 is disposed in the volute 21 and connected to an output shaft of the motor 23. The volute 21 generally includes a front cover plate, a rear cover plate and a circular wall, wherein the circular wall is connected between the front cover plate and the rear cover plate, and the front cover plate and the rear cover plate are provided with air inlets 210. The fan frame 11 includes a rear plate 111 and side plates 112 disposed on left and right sides of the rear plate 111, and the two side plates 112 and the rear plate 111 form a U-shaped frame structure with an open front. A fan cover plate is covered at the front opening of the fan frame 11. Wherein, the air inlet 210 on the front cover plate of the volute 21 is opposite to the fan cover plate (not shown), and the air inlet 210 on the rear cover plate of the volute 21 is opposite to the rear plate 111 of the fan frame 11. The top of the fan frame 11 also has an air outlet plate (hereinafter referred to as top plate 12).

Referring to fig. 3, the embodiment is described by taking an example that the guiding element 30 is disposed opposite to the air inlet 210 on the rear cover plate of the volute, and the guiding element 30 is disposed in the wind frame 11, specifically, at a position above the front side of the air inlet 210 of the volute 21 (herein, "above the front side" may be understood as an outer upper area position of the rear cover plate of the volute), so as to guide the airflow into the air inlet 210 of the volute 21, thereby reducing generation of a large intake vortex on the front side or the rear side of the volute 21.

Referring to fig. 4 and 5, the flow guide member 30 of the present embodiment includes a flow guide plate 31. The guide plate 31 is a square plate, and the left and right width of the square plate is substantially consistent with the left and right width of the fan frame 11. The left and right sides of the lower portion (specifically, the position adjacent to the lower side) of the baffle 31 have pins 312 extending outward and located on the same straight line. The left and right side plates 112 of the fan frame 11 have opposite shaft holes. The air deflector 31 is rotatably disposed in two shaft holes of the blower housing 11 by the two pin shafts 312. On the other hand, in order to ensure that the deflector 31 can flexibly and stably rotate, corresponding bearings can be arranged in the two shaft holes, and the pin shaft 312 is connected to the bearings.

Referring to fig. 7, the outer periphery of the baffle 31 has a flap 32 formed by bending in a direction away from the air inlet 210, wherein the flap 32 at the bottom of the baffle 31 can be in contact with the inner wall of the blower housing 11. In order to avoid that the incoming flow has a large impact on the deflector 31, the flap 32 at the bottom of the deflector 31 is an arc-shaped plate protruding downwards.

Referring to fig. 3, the baffle 31, the flap 32 and the inner wall of the wind turbine frame 11 together define a sound absorption cavity 60, and the sound absorption cavity 60 may be a non-completely closed cavity with an opening (for example, a gap is formed between the flap 32 of the baffle 31 and the inner wall of the wind turbine frame 11, which is an opening), and the sound absorption cavity is filled with sound absorption cotton 50. The baffle 31 is provided with noise reduction holes 311 communicating with the sound absorption chamber 60. Wherein, inhale sound cotton 50 can bond at the back of guide plate 31, and inhale the trailing flank of sound cotton 50 and the edge place plane of folded plate 32 of the periphery of guide plate 31 and level to avoid inhaling sound cotton 50 and cause the interference to the inward deflection process of guide plate 31.

Referring to fig. 4, an orthographic projection of the baffle 31 of the present embodiment on a vertical plane perpendicular to the axis O of the impeller 22 overlaps with an orthographic projection of the air inlet 210 of the volute 21 on a vertical plane. The lower portion of the baffle 31 also has a notch 310 opposite the air inlet 210. In order to ensure that the airflow can smoothly enter the air inlet of the volute 21, the diameter of the air inlet 210 of the volute 21 of the embodiment is D, the notch 310 of the baffle 31 is in the shape of an arc, and the diameter of the notch 310 is D1, wherein D1 is not less than 1.23D, and preferably D1 is 1.1D.

With continued reference to fig. 4, the longitudinal length of the air deflector 31 should be designed reasonably to avoid that the longitudinal length of the air deflector 31 is too long and affects the incoming flows in other directions (such as the left and right sides), and to avoid that the longitudinal length of the air deflector 31 is too short and a good air guiding effect cannot be achieved, the distance from the axis of the impeller 22 to the top plate 12 of the fan frame 11 in this embodiment is denoted by H, the distance from the bottom edge of the air deflector 31 to the top plate 12 of the fan frame 11 is denoted by H1, H1 is not more than 0.9H and preferably H1 is not more than 0.8H.

The deflector 31 is driven by the driving mechanism 40 to deflect in the front-rear direction, and when the deflector 31 deflects, the deflector can approach or separate from the volute 21, so that the distance between the deflector 31 and the volute 21 is changed. Specifically, the baffle 31 rotates about a rotation axis that is a horizontal line perpendicular to the axis of the impeller 22. Wherein, the power output end of the driving mechanism 40 is connected with the upper part of the guide plate 31.

Referring to fig. 1 and 2, the driving mechanism 40 of the present embodiment includes an electric push rod 41 and a sliding seat 42. The electric push rod 41 is arranged on the top plate 12 of the fan frame 11 and is provided with a power output end capable of reciprocating along a linear direction parallel to the axis of the impeller 22, and the sliding seat 42 is connected to the power output end of the electric push rod 41. Slide holder 42 has a strip-shaped movable hole 420 penetrating vertically and extending in the axial direction of impeller 22. The top of the deflector 31 has a connecting rod 313 extending upward, and the connecting rod 313 passes through the top plate 12 of the blower housing 11 and is movably constrained in the strip-shaped movable hole 420 of the sliding seat 42. The top of the connecting rod 313 is also provided with a limiting ball 3130 limited at the upper port of the strip-shaped movable hole 420 of the sliding seat 42.

The distance between the diversion piece 30 and the volute 21 of the embodiment can be adjusted, so that matching diversion and noise reduction can be performed according to the air duct flowing conditions under different working conditions. When the range hood is in a low gear, the fluid on the rear side of the range hood has less flow, and a large amount of gas forms a vortex behind the fan frame 11, so that the upper edge of the flow guide member 30 needs to be adjusted to be close to the volute 21, the flow loss caused by the cyclone is reduced, and the incoming flow from the lower side is guided towards the air inlet 210. When the range hood is in a high gear, the over-flow of the fan is large at the moment, the air inlet 210 of the volute 21 tends to attract fluid from all around, and at the moment, the flow guide piece 30 can be adjusted to be far away from the volute 21, so that the problem of air inlet blockage caused by too close distance between the flow guide piece 30 and the volute 21 is avoided. On the other hand, a sound absorbing cavity is formed between the guide plate 31 and the inner wall of the fan frame 11, sound absorbing materials such as noise reduction cotton are filled inside the sound absorbing cavity, and the guide plate 31 is provided with noise reduction holes 311, so that the noise reduction effect is improved on the basis of effectively guiding the airflow.

On the basis of the above embodiments, other embodiments can be obtained by replacing and improving the related technical features. For example, the flow guide 30 may be moved toward or away from the scroll casing 21 by way of deflection, or moved toward or away from the scroll casing 21 by way of translation in the front-rear direction by integral translation. For another example, the drawing of the present embodiment only shows that the corresponding flow guide member is disposed at the air inlet of the rear cover plate of the volute, and it is conceivable that the flow guide member may also be disposed at the air inlet of the front cover plate of the volute.

Claims (10)

1. A range hood, comprising:

a fan frame (11);

the fan system (20) is arranged in the fan frame (11) and comprises a volute (21), and an air inlet (210) is formed in the volute (21);

it is characterized by also comprising:

the flow guide piece (30) is arranged in the fan frame (11), is positioned above the front side of the air inlet (210) of the volute (21) and is used for guiding the air flow into the air inlet (210);

the driving mechanism (40) is arranged on the fan frame (11), the power output end of the driving mechanism is connected with the flow guide piece (30), and the driving mechanism can drive the flow guide piece (30) to be close to or far away from the volute (21) relative to the volute (21), so that the distance between the flow guide piece (30) and the volute (21) is changed.

2. The range hood of claim 1, wherein: an impeller (22) is arranged in the volute (21), the flow guide piece (30) comprises a flow guide plate (31), the lower portion of the flow guide plate (31) is rotatably connected to the fan frame (11) by taking a horizontal line perpendicular to an axis (O) of the impeller (22) as a rotation axis, and a power output end of the driving mechanism (40) is connected with the upper portion of the flow guide plate (31).

3. The range hood of claim 2, wherein: the driving mechanism (40) comprises an electric push rod (41), the electric push rod (41) is arranged on a top plate (12) of the fan frame (11) and is provided with a power output end capable of reciprocating along a linear direction parallel to the axis (O) of the impeller (22), the top of the guide plate (31) is provided with a connecting rod (313) extending upwards, and the connecting rod (313) penetrates through the top plate (12) of the fan frame (11) and is connected with the power output end of the electric push rod (41) in a rotating mode.

4. The range hood of claim 3, wherein: the driving mechanism (40) further comprises a sliding seat (42) connected with the power output end of the electric push rod (41), the sliding seat (42) is provided with a strip-shaped movable hole (420) which is vertically communicated and extends along the axis (O) direction of the impeller (22), and the connecting rod (313) penetrates through the strip-shaped movable hole (420).

5. The range hood according to any one of claims 2 to 4, wherein: the orthographic projection of the guide plate (31) on a vertical plane perpendicular to the axis of the impeller (22) is overlapped with an air inlet (210) of the volute (21), and the lower part of the guide plate (31) is provided with a notch (310) opposite to the air inlet (210).

6. The range hood of claim 5, wherein: the outer circumference of the guide plate (31) is provided with a folded plate (32) formed by bending along the direction away from the air inlet (210), a sound absorbing cavity (60) is defined among the guide plate (31), the folded plate (32) and the inner wall of the fan frame (11), and a noise reduction hole (311) communicated with the sound absorbing cavity (60) is arranged on the guide plate (31).

7. The range hood of claim 6, wherein: the sound absorption cavity (60) is also filled with sound absorption cotton (50).

8. The range hood of claim 6, wherein: the folded plate (32) at the bottom of the guide plate (31) is an arc-shaped plate protruding downwards.

9. The range hood of claim 5, wherein: the distance from the axis of the impeller (22) to the top plate (12) of the fan frame (11) is represented as H, the distance from the bottom edge of the guide plate (31) to the top plate (12) of the fan frame (11) is represented as H1, and H1 is more than or equal to 0.6H and less than or equal to 0.9H.

10. The range hood of claim 5, wherein: the diameter of an air inlet (210) of the volute (21) is D, the notch (310) of the guide plate (31) is arc-shaped, the diameter of the notch (310) is D1, and D1 is not less than D and not more than 1.23D.

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