CN216788822U

CN216788822U - Range hood with noise reduction function

Info

Publication number: CN216788822U
Application number: CN202123047138.1U
Authority: CN
Inventors: 吴灵辉
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2021-12-04
Filing date: 2021-12-04
Publication date: 2022-06-21
Anticipated expiration: 2031-12-04

Abstract

The utility model relates to a range hood with noise reduction function, 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 air guide sleeve is arranged on the inner wall of the shell, a cavity is formed between the air guide sleeve and the inner wall of the shell, the air guide sleeve comprises a main guide plate opposite to the air inlet of the volute, and the main guide plate inclines towards the air inlet from bottom to top; the main flow guide plate is also provided with a flow guide part which protrudes towards the air inlet and is vertically extended, and first noise reduction holes communicated with the cavity are distributed in the flow guide part. This range hood can effectively eliminate the interior swirl influence of casing, and then promotes the noise reduction effect.

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. The range hood has single air intake range hood and double air intake range hood. At present, a noise reduction device is adopted to absorb and reduce the pneumatic noise generated by a fan so as to reduce the noise pollution to people. Especially, for a double-air-inlet range hood, because two oil smoke channels are formed, oil smoke enters the range hood from the front air inlet and the rear air inlet, and the noise of the range hood mainly comes from the inside of the fan system, so that the fan system can radiate large noise outwards through the two air inlets in the working process.

Therefore, the prior application patent of the applicant, chinese patent application No. cn201310627547.x (with the authorization number of CN103697512B), discloses a silent range hood, which comprises a casing and a smoke collecting hood with an air inlet, wherein a volute is arranged in the casing, the volute is provided with a front air inlet and a rear air inlet, a sound absorbing guide hood is arranged on a casing front cover plate of the casing, which is over against the front air inlet of the volute, a closed cavity is formed between the sound absorbing guide hood and the casing front cover plate, a rear panel of the sound absorbing guide hood, which is opposite to the front air inlet, is provided with a plurality of first micropores communicated with the closed cavity, and the closed cavity is filled with first sound absorbing cotton. The sound absorption air guide sleeve is arranged at the position right opposite to the front air inlet of the volute, the sound absorption air guide sleeve is provided with the micropores, and the sound absorption cotton is filled in the sound absorption air guide sleeve, so that most of front air inlet noise of middle, low and high frequency can be absorbed, and the sound absorption effect can be further enhanced by reasonably selecting the aperture and the center distance of the micropores and the filling area of the sound absorption cotton.

Firstly, the sound-absorbing air guide sleeve on the front cover plate of the machine shell only guides air flow in a single air flow direction, the direction of the air flow entering the air inlet of the fan is mainly complex, the air flow direction from bottom to top is accompanied by the flow direction converging from two sides to the center and the backflow direction from top to bottom, and particularly the vortex is generated at the upper right of the volute due to the limitation of the space of the box body, so that the effect of reducing noise and guiding the air flow only through the sound-absorbing air guide sleeve structure is limited; secondly, inhale the sound cotton and directly fill in inhaling the cavity between sound kuppe and the apron, also easy contaminated entering of greasy dirt can become invalid, needs regularly in time to change, has reduced user's use and has experienced.

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 effectively eliminate the influence of the vortex in the casing so as to improve the noise reduction effect, 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 effectively reduce the pollution of the sound absorption piece by oil stains, 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 housing;

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

the air guide sleeve is arranged on the inner wall of the shell, a cavity is formed between the air guide sleeve and the inner wall of the shell, the air guide sleeve comprises a main guide plate opposite to the air inlet of the volute, and the main guide plate inclines towards the air inlet from bottom to top;

the main flow guide plate is also provided with a flow guide part which protrudes towards the air inlet and is vertically extended, and first noise reduction holes communicated with the cavity are distributed in the flow guide part.

In order to guide the incoming flow below and the backflow above, the flow guide part comprises a strip-shaped wall with an arc-shaped cross section, an upper flow guide wall and a lower flow guide wall, the upper flow guide wall is connected between the upper end of the strip-shaped wall and the main flow guide plate and inclines towards the direction far away from the air inlet from bottom to top, and the lower flow guide wall is connected between the lower end of the strip-shaped wall and the main flow guide plate and inclines towards the air inlet from bottom to top.

In order to further improve the noise reduction effect, a second noise reduction hole communicated with the cavity is arranged on the other part of the main flow guide plate except the flow guide part.

In order to guide the incoming flow of the main flow guide plate in the up-down and left-right directions, a first side flow guide plate and a second side flow guide plate are respectively arranged between the left side and the right side of the main flow guide plate and the inner wall of the casing, an upper flow guide plate is arranged between the upper side of the main flow guide plate and the inner wall of the casing, a lower flow guide plate is arranged between the lower side of the main flow guide plate and the inner wall of the casing, and the main flow guide plate, the first side flow guide plate, the second side flow guide plate, the lower flow guide plate, the upper flow guide plate and the inner wall of the casing jointly define the cavity.

In order to further improve the flow guiding effect, the distance between the left side edge and the right side edge of the main flow guiding plate is gradually reduced from bottom to top, the distance between the left side edge and the right side edge of the upper flow guiding plate is gradually reduced from top to bottom, and the first side flow guiding plate and the second side flow guiding plate are both convex arc-shaped plates.

In order to enable the incoming flow from the lower part to flow to the area where the main guide plate is located more smoothly, the lower guide plate inclines towards the air inlet from bottom to top, and the vertical section of the lower guide plate is arc-shaped.

As an improvement, the included angle formed by the intersection of the upper guide plate and the horizontal plane is alpha, and alpha is more than 0 degree and less than 60 degrees.

As an improvement, the included angle formed by the intersection of the main flow guide plate and the vertical plane is beta, and the beta is more than 3 degrees and less than 10 degrees.

The technical scheme adopted by the utility model for solving the second technical problem is as follows: the first week of making an uproar hole of falling is followed and is had the orientation the first annular that the cavity extended formation keeps off the edge, the second falls the week of making an uproar hole of following and has the orientation the second annular that the cavity extended formation keeps off the edge, it has the sound cotton of inhaling to fill in the cavity, first annular keep off along and the second annular keep off along with inhale the cotton counterbalance of sound, thereby will inhale the sound cotton with the internal face of kuppe is spaced apart.

In order to quickly guide the oil on the inner wall of the air guide sleeve downwards to the outside of the air guide sleeve, the bottom of the inner wall of the air guide sleeve is provided with oil guide plates downwards from two sides to the middle position, and the lowest position of each oil guide plate is provided with an oil leakage port.

In order to further improve the overall noise reduction effect of the range hood facing the double air inlets, two air inlets of the volute are respectively a front air inlet and a rear air inlet, and two flow guide covers are arranged on two opposite side walls of the casing and are respectively opposite to the front air inlet and the rear air inlet.

Compared with the prior art, the utility model has the advantages that: the main flow guide plate of the air guide cover can guide the main incoming flow below to the direction of the air inlet of the volute, and on the basis, the flow guide part vertically extends and is capable of guiding the incoming flows on the left side and the right side to the air inlet, so that the air flow entering the shell in all directions can be gathered to the central area where the air inlet is located. Especially, the setting of water conservancy diversion portion can form the baffle to the left and right sides incoming flow to a certain extent, can break the swirl in the upper right side of spiral case air intake, effectively reduces pneumatic noise, and it falls the scheme of making an uproar for current single direction (from bottom to top) water conservancy diversion, can realize the purpose of making an uproar that falls in the multidimension water conservancy diversion.

Drawings

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

fig. 2 is a vertical sectional view of the extractor hood according to the embodiment of the present invention along the front-rear direction;

FIG. 3 is an exploded view of a range hood in accordance with an embodiment of the present invention;

fig. 4 is a schematic perspective view of a dome of a range hood according to an embodiment of the present invention;

fig. 5 is a front view of a dome of the range hood according to the embodiment of the present invention;

FIG. 6 is a cross-sectional view taken at A-A of FIG. 5;

fig. 7 is a schematic perspective view of a back surface of a dome of the range hood according to the embodiment of the present invention;

fig. 8 is a schematic perspective view of a sound-absorbing cotton of a range hood according to an embodiment of the present invention.

Detailed Description

The utility model is described in further detail below with reference to the following examples of the drawings.

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 to 8, a range hood with a noise reduction function includes a casing 10 and a fan system 20, the casing 10 includes a fan frame 11 and a smoke collecting hood 13, and the smoke collecting hood 13 is disposed at the bottom of the fan frame 11. The fan system 20 is disposed in the fan frame 11 and used for providing negative pressure for sucking and exhausting oil smoke. The fan system 20 includes a volute 21, an impeller and a motor, wherein the impeller is disposed in the volute 21 and connected to an output shaft of the motor. The volute 21 has an air inlet 210 a; 210b, an air inlet 210 a; 210b include a front air inlet 210a on the front cover plate 12 of the scroll casing 21 and a rear air inlet 210b on the rear cover plate 12. Usually, the fan frame 11 is a U-shaped plate structure with an open side, and the open side of the fan frame 11 is connected with a fan cover plate 12. In this embodiment, the front air inlet 210a of the scroll casing 21 is opposite to the front sidewall of the fan frame 11, and the rear air inlet 210b is opposite to the fan cover 12. The structure of the range hood is the prior art.

The range hood of the embodiment further includes a dome 30 and sound absorption cotton 40.

As shown in fig. 2, the air guide sleeve 30 is provided on the front side wall of the blower housing 11. A cavity 300 is formed between the air guide sleeve 30 and the inner wall of the cabinet 10, and the sound-absorbing cotton 40 is filled in the cavity 300. The air guide sleeve 30 is also provided with noise reduction holes communicated with the cavity 300.

Referring to fig. 4, the air guide sleeve 30 includes a main guide plate 31, an upper guide plate 34, a lower guide plate 35, a first side guide plate 32, a second side guide plate 33, and a guide part 36. Among them, the air inlet 210a of the volute 21; 210b are opposite and face the air inlet 210a from bottom to top; 210b are inclined, and the interval between the left and right sides of the main baffle 31 is gradually decreased from bottom to top. The upper baffle 34 faces the air inlet 210a from top to bottom; 210b are inclined such that the bottom edge of the upper baffle 34 is connected to the top edge of the main baffle 31 and the distance between the left and right edges thereof gradually decreases from top to bottom. The first side baffle 32 is connected to the left side of the main baffle 31 and the left side of the upper baffle 34, and faces the air inlet 210a from left to right; 210b are inclined. The second side baffle 33 is connected to the right side of the main baffle 31 and the right side of the upper baffle 34, and faces the air inlet 210a from right to left; 210b are inclined. Specifically, the first side baffle 32 and the second side baffle 33 are both arc plates protruding outward. The lower baffle 35 faces the air inlet 210a from bottom to top; 210b are inclined and their vertical cross-sections in the front-rear direction are arc-shaped. The main baffle 31, the first side baffle 32, the second side baffle 33, the lower baffle 35, and the upper baffle 34 define the cavity 300 together with the front side wall of the fan frame 11.

Referring to fig. 6, the upper baffle 34 intersects the horizontal plane at an angle α, 0 ° < α < 60 °, preferably 45 °. The angle formed by the intersection of the main deflector 31 and the vertical plane is beta, 3 ° < beta < 10 °, preferably 8 °.

Referring to fig. 4 and 6, the flow guiding portion 36 is formed on the main flow guiding plate 31, and extends vertically and faces the air inlet 210 a; 210b are convex. Specifically, in order to guide the incoming flow below and the backflow flow above, the flow guide part 36 includes a strip-shaped wall 361, and an upper flow guide wall 362 and a lower flow guide wall 363, and a cross section of the strip-shaped wall 361 is a convex arc shape. The upper flow guiding wall 362 is connected between the upper end of the strip-shaped wall 361 and the main flow guiding plate 31, and is far away from the air inlet 210a from bottom to top; 210b are inclined. The lower flow guide wall 363 is connected between the lower end of the strip-shaped wall 361 and the main flow guide plate 31 and faces the air inlet 210a from bottom to top; 210b are inclined. The above-mentioned "vertically extending arrangement" may refer to an arrangement extending in a vertical direction, and may also refer to a condition that the flow guide portion 36 is slightly inclined with respect to a vertical line.

Referring to fig. 7, the strip-shaped wall 361 of the flow guide 36 is provided with first noise reduction holes 3610 communicating with the cavity 300. The main flow guide plate 31 of the air guide sleeve 30 is provided with a second noise reduction hole 310 communicating with the cavity 300 except for the air guide part 36. Wherein, the aperture range of the first noise reduction holes 3610 and the second noise reduction holes 310 is 1-5 mm.

Referring to FIG. 6, the perimeter of the first noise reduction hole 3610 has a first annular ledge 3611 extending toward the cavity 300. similarly, the perimeter of the second noise reduction hole 310 has a second annular ledge 311 extending toward the cavity 300. The protruding depth of the first annular blocking edge 3611 and the protruding depth of the second annular blocking edge 311 are 1-5 mm. The inner space of each first annular baffle edge 3611 and the inner space of each second annular baffle edge 311 of the present embodiment form a helmholtz resonator. Based on the calculation formula of the acoustic helmholtz resonant cavity frequency, the volume of the resonant cavity is increased to reduce the sound absorption frequency range, and since the sound absorption material (such as the sound absorption cotton 40) generally has a weak sound absorption capability to the low frequency range, the arrangement of the resonant cavity formed by the first annular blocking edge 3611 and the second annular blocking edge 311 improves the sound absorption effect.

Referring to fig. 2, the cavity 300 is filled with sound-absorbing cotton 40. Wherein, the overall shape of the sound-absorbing cotton 40 is matched with the shape of the cavity 300. The end of the first annular blocking edge 3611 and the end of the second annular blocking edge 311 are abutted against the sound-absorbing cotton 40, so that the sound-absorbing cotton 40 is spaced from the inner wall surface of the air guide sleeve 30, direct contact with oil smoke is reduced, and the service life of the sound-absorbing cotton 40 is prolonged.

Referring to fig. 7, in order to quickly guide the oil on the inner wall of the air guide sleeve 30 downward to the outside of the air guide sleeve 30, the bottom of the inner wall of the air guide sleeve 30 is provided with oil guide plates 37 downward from two sides to the middle position, and the oil leakage port 370 is formed at the lowest position of the oil guide plate 37. After entering the air guide sleeve 30, the oil dirt can flow downwards in the gap between the sound absorption cotton 40 and the air guide sleeve 30 and is gathered on the oil guide plate 37, the oil guide plate 37 has a certain inclination angle with the horizontal direction, the inclination angle is more than 5 degrees, and the oil dirt can be guided to the middle oil leakage hole, so that the oil dirt entering the air guide sleeve 30 is discharged. In addition, the installation surface of the outer periphery of the air guide sleeve 30 can be fixed through the hole columns and is in close contact with the fan cover plate 12 or the fan frame 11, and oil dirt cannot enter the air guide sleeve 30 from the installation surface.

On the basis of the above embodiments, other embodiments can be obtained by replacing and improving the related technical features. For example, the drawings in this embodiment only show that the noise reduction and flow guiding structure of the air guide sleeve 30 is disposed on the front side wall of the fan frame 11 (i.e., the side plate directly opposite to the front air inlet 210a), and it is conceivable that, for a range hood with front and rear dual air inlets, two air guide sleeves 30 may be disposed, and are respectively disposed on two opposite side walls of the casing 10 (i.e., the front side walls of the fan cover plate 12 and the fan frame 11), and are respectively opposite to the front air inlet 210a and the rear air inlet 210b of the scroll casing 21. For another example, the cross section of the strip-shaped wall 361 of the guiding portion 36 of the guiding cover 30 is not limited to a convex arc, but may be a V-shaped or other curved structure (e.g. concave arc), as long as it is capable of guiding the left and right incoming flows toward the air inlet 210a of the volute casing 21; 210 b.

Claims

1. A range hood with noise reduction function comprises:

a housing (10);

the fan system is arranged in the shell (10) and comprises a volute (21), and the volute (21) is provided with an air inlet (210 a; 210 b);

the air guide sleeve (30) is arranged on the inner wall of the casing (10), a cavity (300) is formed between the air guide sleeve and the inner wall of the casing (10), the air guide sleeve (30) comprises a main guide plate (31) opposite to an air inlet (210 a; 210b) of the volute (21), and the main guide plate (31) inclines towards the air inlet (210 a; 210b) from bottom to top;

the method is characterized in that: the main guide plate (31) is also provided with a flow guide part (36) which protrudes towards the air inlets (210 a; 210b) and is arranged in a vertically extending manner, and first noise reduction holes (3610) communicated with the cavity (300) are distributed on the flow guide part (36).

2. The range hood with noise reduction function according to claim 1, wherein: the flow guide part (36) comprises a strip-shaped wall (361) with an arc-shaped cross section, an upper flow guide wall (362) and a lower flow guide wall (363), the upper flow guide wall (362) is connected between the upper end of the strip-shaped wall (361) and the main flow guide plate (31) and inclines towards the direction far away from the air inlet (210 a; 210b) from bottom to top, and the lower flow guide wall (363) is connected between the lower end of the strip-shaped wall (361) and the main flow guide plate (31) and inclines towards the air inlet (210 a; 210b) from bottom to top.

3. The range hood with noise reduction function according to claim 1, wherein: and the other part of the main flow guide plate (31) except the flow guide part (36) is provided with a second noise reduction hole (310) communicated with the cavity (300).

4. The range hood with noise reduction function according to claim 1, wherein: a first side guide plate (32) and a second side guide plate (33) are respectively arranged between the left side and the right side of the main guide plate (31) and the inner wall of the casing (10), an upper guide plate (34) is arranged between the upper side of the main guide plate (31) and the inner wall of the casing (10), a lower guide plate (35) is arranged between the lower side of the main guide plate (31) and the inner wall of the casing (10), and the main guide plate (31), the first side guide plate (32), the second side guide plate (33), the lower guide plate (35), the upper guide plate (34) and the inner wall of the casing (10) jointly define the cavity (300).

5. The range hood with a noise reduction function according to claim 4, wherein: the distance between the left side edge and the right side edge of the main guide plate (31) is gradually reduced from bottom to top, the distance between the left side edge and the right side edge of the upper guide plate (34) is gradually reduced from top to bottom, and the first side guide plate (32) and the second side guide plate (33) are both convex arc-shaped plates.

6. The range hood with a noise reduction function according to claim 4, wherein: the lower guide plate (35) inclines towards the air inlets (210a, 210b) from bottom to top, and the vertical section of the lower guide plate is arc-shaped.

7. The range hood with noise reduction function according to claim 4, wherein: the upper guide plate (34) and the horizontal plane are intersected to form an included angle alpha, and the angle alpha is more than 0 degree and less than 60 degrees.

8. The range hood with noise reduction function according to claim 1, wherein: the included angle formed by the intersection of the main flow guide plate (31) and the vertical plane is beta, and beta is more than 3 degrees and less than 10 degrees.

9. The range hood with noise reduction function according to claim 3, wherein: the week of first hole (3610) of making an uproar has the orientation first annular that cavity (300) extension formed keeps off along (3611), the week of the hole (310) of making an uproar is made an uproar along having the orientation second annular that cavity (300) extension formed keeps off along (311), it inhales sound cotton (40) to fill in cavity (300), first annular keep off along (3611) and second annular keep off along (311) with inhale sound cotton (40) counterbalance, thereby will inhale sound cotton (40) with the internal face interval of kuppe (30).

10. The range hood with a noise reduction function according to claim 9, wherein: the bottom of the inner wall of the air guide sleeve (30) is provided with an oil guide plate (37) which inclines downwards from two sides to the middle position, and the lowest position of the oil guide plate (37) is provided with an oil leakage opening (370).

11. The range hood with the noise reduction function according to any one of claims 1 to 10, wherein: the two air inlets (210 a; 210b) of the volute (21) are respectively a front air inlet (210a) and a rear air inlet (210b), and the two air guide covers (30) are respectively arranged on two opposite side walls of the casing (10) and are respectively opposite to the front air inlet (210a) and the rear air inlet (210 b).