CN216306257U - Centrifugal fan for range hood and range hood applying centrifugal fan - Google Patents

Abstract

The utility model relates to a centrifugal fan for a range hood and a range hood applying the same, wherein the centrifugal fan comprises: the fan frame is provided with two connecting plates which are oppositely arranged; the volute is arranged in the fan frame and positioned between the two connecting plates, the volute comprises a front cover plate, a rear cover plate and a ring wall, and the ring wall is arranged between the front cover plate and the rear cover plate; the lower guide plate is arranged below the bottom of the annular wall and connected between the bottom of the front cover plate and the bottom of the rear cover plate; the two connecting plates, the front cover plate, the rear cover plate, the annular wall and the lower guide plate jointly define a first noise reduction cavity, a first noise reduction hole communicated with the first noise reduction cavity is formed in the volute, and a second noise reduction hole communicated with the first noise reduction cavity is formed in the lower guide plate. The centrifugal fan can fully utilize the peripheral flowing dead zone space of the volute, and effectively improves the noise reduction effect.

Description

Centrifugal fan for range hood and range hood applying centrifugal fan

Technical Field

The utility model relates to the technical field of range hoods, in particular to a centrifugal fan for a range hood and a range hood applying the centrifugal fan.

Background

The range hood is a kitchen appliance for purifying the kitchen environment, wherein, the centrifugal fan is an important part of the range hood and is used for providing negative pressure for sucking and exhausting oil smoke. The centrifugal fan for the existing range hood generally comprises a volute, a volute tongue, an impeller and a motor, wherein the volute comprises a front cover plate, a rear cover plate, an annular middle annular wall for connecting the front cover plate and the rear cover plate, and a lower guide plate. The noise that produces in the range hood operation process can influence people's culinary art and experience and healthy. The noise of the range hood mainly comes from the impeller rotation noise and the vortex broadband noise, and particularly, the noise problem generated by the vortex in the existing range hood is serious.

In order to absorb noise in the volute, the conventional scheme is to form micropores on the annular wall of the volute for first-layer noise reduction, and attach a sound-absorbing material for double noise reduction, as disclosed in chinese patent application with application number CN201910311592.1 (publication number CN110005645A), "a noise-reduction centrifugal fan" includes a fan frame, a volute and an impeller, the volute includes a front cover plate, a rear cover plate, a lower guide plate and an annular wall, the lower guide plate is disposed at the bottom of the front cover plate and the rear cover plate, the annular wall is disposed between the front cover plate and the rear cover plate, noise-reduction holes are formed in the annular wall, the periphery of the annular wall is circumferentially divided into at least three noise-reduction cavities, each noise-reduction cavity corresponds to a corresponding noise-reduction hole unit, and the ratio of the noise-reduction hole area of each noise-reduction hole unit to the volume of the corresponding noise-reduction cavity is sequentially reduced along the counterclockwise direction of the molded line of the volute, wherein sound-absorbing cotton is further filled in the noise-reduction cavities. According to the noise reduction device, only the noise reduction holes are formed in the annular wall of the volute and the sound absorption material is arranged on the annular wall of the volute to reduce noise, the sound absorption material is limited in thickness and cannot exert the noise reduction effect to the maximum extent due to the limitation of space, and the sound absorption material is additionally arranged on the annular wall of the volute and can occupy the flow channel space.

The flow guide plate comprises a flow guide plate body, wherein the flow guide plate body is provided with noise reduction holes, a grid plate is arranged on the inner wall of the flow guide plate body, each grid of the grid plate forms a noise reduction cavity, each noise reduction cavity corresponds to one noise reduction hole, and the ratio S/V of the area S of the noise reduction holes to the volume V of the noise reduction cavities is gradually reduced from the middle area of the flow guide plate body to the left side and the right side. 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 at different positions of the air inlet of the fan, so that the broadband noise reduction of the fan guide plate is realized, and the noise of the fan during working is effectively reduced. This patent only sets up on the guide plate and falls the hole of making an uproar, and need additionally increase the grid plate who falls the chamber of making an uproar with the cooperation of guide plate body, and it falls the structure of making an uproar complicacy, and manufacturing cost is higher.

Therefore, the above-mentioned traditional noise reduction measures that only add a noise reduction structure on the volute wall part or the flow guide plate cannot meet the requirement of people on low noise of the range hood.

SUMMERY OF THE UTILITY MODEL

The first technical problem to be solved by the utility model is to provide a centrifugal fan for a range hood, which can fully utilize the flowing dead zone space around a volute and effectively improve the noise reduction effect, aiming at the current situation of the prior art.

The second technical problem to be solved by the present invention is to provide a range hood using the centrifugal fan in view of 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 centrifugal fan for a range hood, comprising:

the fan frame is provided with two connecting plates which are oppositely arranged;

the volute is arranged in the fan frame and positioned between the two connecting plates, the volute comprises a front cover plate, a rear cover plate and a ring wall, and the ring wall is arranged between the front cover plate and the rear cover plate;

the lower guide plate is arranged below the bottom of the annular wall and connected between the bottom of the front cover plate and the bottom of the rear cover plate;

the two connecting plates, the front cover plate, the rear cover plate, the annular wall and the lower guide plate jointly define a first noise reduction cavity, a first noise reduction hole communicated with the first noise reduction cavity is formed in the volute, and a second noise reduction hole communicated with the first noise reduction cavity is formed in the lower guide plate.

In order to improve the noise reduction effect of the first noise reduction cavity, the front cover plate, the rear cover plate and the annular wall are provided with the first noise reduction holes.

For the two air inlet fan around the adaptation, realize good water conservancy diversion purpose, the guide plate is located down the bottom of front shroud with between the bottom of back shroud, and the middle part is recessed and is the V type on the whole.

In order to further improve the noise reduction effect, a noise reduction part is filled in the first noise reduction chamber, the noise reduction part comprises a first noise reduction part which is attached to the wall of the volute and covers the first noise reduction hole and a second noise reduction part which is attached to the inner wall of the lower guide plate and covers the second noise reduction hole, and a gap is formed between the first noise reduction part and the second noise reduction part and used as a sound insulation layer. The noise reduction piece is arranged in the first noise reduction cavity, so that the space of the peripheral flow dead zone of the volute is fully utilized, the occupation of the volute flow channel space is avoided, and the influence on the flow of the air flow is avoided.

The above structure design makes the centrifugal fan have the function of multiple noise reduction, that is, the noise generated by the airflow flowing in the volute can sequentially pass through the first noise reduction hole on the annular wall, the first noise reduction piece, the sound insulation layer (also called air layer), the second noise reduction piece and the second noise reduction hole on the lower guide plate for five-fold noise reduction, or the noise generated by the airflow flowing in the volute can sequentially pass through the first noise reduction hole on the annular wall, the first noise reduction piece, the sound insulation layer (also called air layer), the first noise reduction piece and the first noise reduction hole on the front and rear cover plates for five-fold noise reduction, similarly, the noise generated in the fan frame sequentially passes through the second noise reduction hole on the lower guide plate, the second noise reduction piece, the sound insulation layer (also called air layer), the first noise reduction piece and the first noise reduction hole on the annular wall for five-fold noise reduction, or the noise generated in the fan frame sequentially passes through the first noise reduction hole on the front and rear cover plates for five-fold noise reduction, First amortization piece, puigging (also being the air bed), first amortization piece and the first hole of making an uproar of falling on the rampart carry out the quintuple and fall the noise, and it is compared in traditional dually and falls the noise, and the amplitude of making an uproar of falling promotes by a wide margin.

In the radial direction of the volute, the flow laws of the volute about the volute are generally inconsistent, in order to achieve the purpose of noise reduction matched with the volute and improve the noise reduction effect, a first partition plate is further arranged between the annular wall and the fan frame and is arranged at intervals along the circumferential direction of the annular wall, so that the area enclosed among the annular wall, the front cover plate, the rear cover plate, the lower guide plate and the fan frame is divided into a plurality of noise reduction chambers along the circumferential direction, and the noise reduction chambers opposite to the lower guide plate form the first noise reduction chambers.

Because the airflow on the lower guide plate at the bottom of the volute is also obviously different from the airflow in the front cover plate area and the rear cover plate area at the bottom of the volute, in order to realize the noise reduction effect matched with the airflow, the bottom of the volute is also provided with a horizontally arranged second partition plate, and the second partition plate divides the first noise reduction chamber into an upper noise reduction chamber at the upper part and a lower noise reduction chamber at the lower part.

In order to divide the upper noise reduction chamber into more noise reduction chambers and improve the noise reduction effect, the second partition plate is in contact with the bottom of the annular wall, so that the upper noise reduction chamber is divided into a first chamber on the left side and a second chamber on the right side.

In order to further improve the noise reduction effect of the noise reduction chamber, the noise reduction chamber further comprises a third partition plate arranged in the noise reduction chamber, the third partition plate extends in the left-right direction and is vertically arranged, and therefore the noise reduction chamber is divided into a third chamber located in the front part and a fourth chamber located in the rear part.

In order to realize noise reduction of the volute except for the other area positions of the volute opposite to the lower guide plate and ensure the whole noise reduction effect of the volute, two first partition plates are respectively arranged at the left side area position and the right side area position of the annular wall, so that a second noise reduction chamber is defined by the fan frame, the front cover plate, the rear cover plate, the annular wall and the first partition plate at the upper left of the volute, a third noise reduction chamber is defined by the fan frame, the front cover plate, the rear cover plate, the annular wall and the first partition plate at the upper right of the volute, a first noise reduction chamber is defined by the two connecting plates, the front cover plate, the rear cover plate, the annular wall and the two first partition plates at the lower part of the volute, third noise reduction holes communicated with the second noise reduction chamber are arranged on the front cover plate, the rear cover plate and the annular wall, and fourth noise reduction holes communicated with the third noise reduction chamber are arranged on the front cover plate, the rear cover plate and the annular wall, the second noise reduction cavity is filled with a third noise reduction piece, and the third noise reduction cavity is filled with a fourth noise reduction piece.

The double suction form of air inlet around the fan system generally adopts at present, but because the existence of motor, often one side air inlet proportion is less, in order to realize according to the difference of intake the assorted noise reduction, still including be used for with go up the fourth baffle that the cavity of making an uproar separates into two cavities in the front and back direction, be used for with the cavity of making an uproar is fallen to the second separates into the fifth baffle of two cavities in the front and back direction and is used for with the cavity is fallen to the third sixth baffle that separates into two cavities in the front and back direction, fourth baffle, fifth baffle and sixth baffle are located the coplanar basically.

In order to further ensure the noise reduction effect, the distance between the fourth partition board and the front cover board is marked as L1, the distance between the fourth partition board and the rear cover board is marked as L2, wherein, 2 is less than or equal to L1/L2 is less than or equal to 4.

The technical scheme adopted by the utility model for solving the second technical problem is as follows: a range hood using the centrifugal fan for the range hood.

Compared with the prior art, the utility model has the advantages that: the sealed cavity forms a first noise reduction cavity which can effectively reduce noise generated by flowing air flow in the volute and flowing noise generated by air flow in the fan frame (outside the volute), and the sealed cavity does not need to additionally increase a grid plate matched with the lower guide plate in the prior art, thereby ensuring the noise reduction effect of the area of the volute on the basis of saving the production cost. In the preferred scheme, the first noise reduction chamber is filled with the noise reduction piece, the dead zone space outside the volute is further utilized, and the purpose of multiple noise reduction is achieved on the premise that the space of the flow passage of the volute is not occupied.

Drawings

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

FIG. 2 is a schematic perspective view of a centrifugal fan according to an embodiment of the present invention;

FIG. 3 is a schematic perspective view of the silencer of FIG. 1 without the silencer;

FIG. 4 is a left side view of FIG. 1;

FIG. 5 is a cross-sectional view taken at A-A of FIG. 4;

FIG. 6 is a schematic structural view of FIG. 5 without the corresponding silencer and part of the partition;

FIG. 7 is a cross-sectional perspective view taken at A-A of FIG. 4;

FIG. 8 is an exploded view of FIG. 1 (with the mounting bracket and the like omitted);

fig. 9 is a schematic perspective view of a range hood according to an embodiment of the present invention;

fig. 10 is a vertical sectional view of the extractor hood according to the embodiment of the present invention along the left-right direction.

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 10, a centrifugal fan for a range hood includes a fan frame 10, a scroll casing 20, an impeller (not shown), a motor (not shown), and a lower baffle 30. The blower frame 10 of the present embodiment is a square-shaped cover structure having two connecting plates 100 arranged oppositely in the left-right direction and a top plate 101 connected between the tops of the two connecting plates 100. The volute 20 is disposed within the blower housing 10 and is located between two connection plates 100. The scroll casing 20 specifically includes a front cover plate 21, a rear cover plate 22, and a circumferential wall 23, wherein the front cover plate 21 and the rear cover plate 22 are disposed opposite to each other, and the circumferential wall 23 is disposed between the front cover plate 21 and the rear cover plate 22. The two ends of the annular wall 23, together with the front cover plate 21 and the rear cover plate 22, define an air outlet 26 for the airflow in the volute 20 to flow out. The front cover plate 21 and the rear cover plate 22 are both provided with air inlets 25, and the air inlets 25 of the front cover plate 21 are provided with air inlet rings 24. The impeller is arranged in the volute 20, and the motor is arranged at the air inlet 25 of the rear cover plate 22 and is in driving connection with the impeller, so that the impeller is driven to rotate to provide negative pressure.

Referring to fig. 1, in order to adapt to the front and rear double-intake fans and achieve the purpose of good flow guiding, the lower flow guiding plate 30 of the present embodiment is located below the bottom of the annular wall 23 and is connected between the bottom of the front cover plate 21 and the bottom of the rear cover plate 22, and the middle of the lower flow guiding plate 30 is concave downward and is in a V shape as a whole.

Referring to fig. 3, the front shroud 21 and the rear shroud 22 of the present embodiment each have a portion exposed to the annular wall 23 in the radial direction of the impeller. A first partition plate 81 is further arranged between the annular wall 23 of the volute 20 and the fan frame 10, wherein the first partition plate 81 is arranged at intervals along the circumferential direction of the annular wall 23, so that an area enclosed between the annular wall 23, the front cover plate 21, the rear cover plate 22, the lower guide plate 30 and the fan frame 10 (including the connecting plate 100 and the top plate 101) is divided into a plurality of noise reduction chambers along the circumferential direction. Two first partition plates 81 are respectively arranged at the left side area position and the right side area position of the annular wall 23, so that the second noise reduction chamber 60 is defined by one of the connection plates 100 of the fan frame 10, the top plate 101, the front cover plate 21, the rear cover plate 22, the annular wall 23 and the first partition plate 81 at the upper left of the scroll casing 20, the third noise reduction chamber 70 is defined by the other connection plate 100 of the fan frame 10, the top plate 101, the front cover plate 21, the rear cover plate 22, the annular wall 23 and the first partition plate 81 at the upper right of the scroll casing 20, and the first noise reduction chamber 50 is defined by the two connection plates 100, the front cover plate 21, the rear cover plate 22, the annular wall 23, the first partition plate 81 and the lower baffle plate 30 at the lower right of the scroll casing 20 (including the lower left and lower right), that is, the first noise reduction chamber 50 of the present embodiment is a noise reduction chamber facing the lower baffle plate 30.

With continued reference to fig. 3, the front cover plate 21, the rear cover plate 22 and the annular wall 23 of the volute 20 are all provided with a first noise reduction hole 200 communicated with the first noise reduction chamber 50, and the lower baffle 30 is provided with a second noise reduction hole 300 communicated with the first noise reduction chamber 50. The front cover plate 21, the rear cover plate 22 and the annular wall 23 are also provided with third noise reduction holes 61 communicated with the second noise reduction chambers 60. The front cover plate 21, the rear cover plate 22 and the annular wall 23 are also provided with fourth noise reduction holes 71 communicated with the third noise reduction chambers 70. Wherein, the first noise reduction chamber 50 is further filled with noise reduction parts, the noise reduction parts include a first noise reduction part 41 and a second noise reduction part 42, the first noise reduction part 41 is attached to the front cover plate 21, the rear cover plate 22 and the annular wall 23 of the scroll casing 20 and covers the first noise reduction hole 200 therein, and the second noise reduction part 42 is attached to the inner wall of the lower baffle 30 and covers the second noise reduction hole 300 of the lower baffle 30, as shown in detail in fig. 1. The second noise reduction chamber 60 is filled with a third noise reduction member 43, and the third noise reduction member 43 is attached to the inner walls of the front cover plate 21, the rear cover plate 22, and the annular wall 23 corresponding to the second noise reduction chamber 60, and covers the third noise reduction hole 61. The third noise reduction chamber 70 is filled with a fourth noise reduction member 44, and the fourth noise reduction member 44 is attached to the inner walls of the front cover plate 21, the rear cover plate 22 and the annular wall 23 corresponding to the third noise reduction chamber 70 and covers the fourth noise reduction hole 71, as shown in fig. 4 and 5.

The first noise reduction part 41, the second noise reduction part 42, the third noise reduction part 43 and the fourth noise reduction part 44 are all made of sound absorption cotton and are all fixed on the corresponding front cover plate 21, the corresponding rear cover plate 22, the corresponding annular wall 23 and the corresponding lower guide plate 30 through the fixing bracket 45.

In the present embodiment, the first sound-deadening member 41 and the second sound-deadening member 42 have the first gap 500 therebetween as a sound-deadening layer. Similarly, the third noise attenuating elements 43 in the second noise reduction chamber 60 have second gaps 62 therebetween to provide an acoustical layer, and the fourth noise attenuating elements 44 in the third noise reduction chamber 70 have third gaps 72 therebetween to provide an acoustical layer, as best seen in FIG. 7.

The noise reduction chambers (including the first noise reduction chamber 50, the second noise reduction chamber 60 and the third noise reduction chamber 70) are provided with the noise reduction members, so that the space of the peripheral flow dead zone of the volute 20 is fully utilized, the occupation of the flow passage space of the volute 20 is avoided, and the influence on the flow of the air flow is avoided. The above-mentioned structural design enables the centrifugal fan to have a multiple noise reduction function, taking the first noise reduction chamber 50 as an example, the noise generated by the airflow flowing in the volute 20 can be reduced five times through the first noise reduction hole 200 on the annular wall 23, the first noise reduction member 41, the sound insulation layer (also called an air layer), the second noise reduction member 42 and the second noise reduction hole 300 on the lower guide plate 30 in sequence, or the noise generated by the airflow flowing in the volute 20 can be reduced five times through the first noise reduction hole 200 on the annular wall 23, the first noise reduction member 41, the sound insulation layer (also called an air layer), the first noise reduction member 41 and the first noise reduction hole 200 on the front and rear cover plates 22 in sequence, and similarly, the noise generated in the fan frame 10 can be reduced five times through the second noise reduction hole 300 on the lower guide plate 30, the second noise reduction member 42, the sound insulation layer (also called an air layer), the first noise reduction member 41 and the first noise reduction hole 200 on the annular wall 23 in sequence, or, the noise generated in the fan frame 10 is sequentially reduced by five times through the first noise reduction hole 200, the first noise reduction member 41, the noise insulation layer (i.e., the air layer), the first noise reduction member 41 and the first noise reduction hole 200 on the annular wall 23 on the front and rear cover plates 22, and compared with the conventional double noise reduction, the noise reduction amplitude is greatly increased.

Since the air flow on the lower baffle 30 at the bottom of the volute 20 is significantly different from the air flow in the area of the front and rear cover plates 22 adjacent to the bottom of the volute 20, in order to achieve the noise reduction effect matched with the air flow, referring to fig. 4, the bottom of the volute 20 of the present embodiment is further provided with a horizontally disposed second partition 82, and the second partition 82 divides the first noise reduction chamber 50 into an upper noise reduction chamber 51 at the upper portion and a lower noise reduction chamber 52 at the lower portion. In order to divide the chamber into more noise reduction chambers and improve the noise reduction effect, the second partition 82 is in contact with the bottom of the annular wall 23, thereby dividing the upper noise reduction chamber 51 into a first chamber 511 located on the left side and a second chamber 512 located on the right side, that is, the first chamber 511 is located on the lower left side of the scroll casing 20, and the second chamber 512 is located on the lower right side of the scroll casing 20.

With continued reference to fig. 4, in order to further improve the noise reduction effect of the noise reduction chamber 52, the present embodiment further includes a third partition plate 83 provided in the noise reduction chamber 52, the third partition plate 83 extending in the left-right direction and being vertically arranged so as to partition the noise reduction chamber 52 into a third chamber 521 at the front and a fourth chamber 522 at the rear.

Referring to fig. 7, a fan system generally adopts a double suction type of front and rear air intake, but due to the existence of a motor, the air intake ratio at one side is often small, and in order to achieve matched noise reduction according to the difference of air intake, a fourth partition plate 84, a fifth partition plate 85 and a sixth partition plate 86 are further correspondingly arranged in the upper noise reduction chamber 51, the second noise reduction chamber 60 and the third noise reduction chamber 70 of the present embodiment in sequence, wherein the fourth partition plate 84 divides the upper noise reduction chamber 51 into two chambers in the front-rear direction, the fifth partition plate 85 divides the second noise reduction chamber 60 into two chambers in the front-rear direction, the sixth partition plate 86 divides the third noise reduction chamber 70 into two chambers in the front-rear direction, and the fourth partition plate 84, the fifth partition plate 85 and the sixth partition plate 86 of the present embodiment are substantially located on the same plane. To further ensure the noise reduction effect, the distance between the fourth partition 84 (i.e., the fifth partition 85 or the sixth partition 86) and the front cover 21 is designated as L1, and the distance between the fourth partition 84 (i.e., the fifth partition 85 or the sixth partition 86) and the rear cover 22 is designated as L2, wherein L1/L2 is 2 ≦ L2 ≦ 4, as shown in FIG. 4.

The present embodiment further relates to a range hood applying the centrifugal fan, the range hood includes a casing 14, a smoke collecting hood 11, an oil cup 12 and a rectifying plate 13, the smoke collecting hood 11 is disposed at the bottom of the casing 14, and an air suction opening (not shown) is disposed on the smoke collecting hood 11. The centrifugal fan is arranged in the casing 14, and a fan frame 10 of the centrifugal fan is connected to the casing 14. The oil cup 12 is long, is arranged at the rear side of the bottom of the smoke collecting hood 11, and extends along the left-right direction. The rectifying plate 13 is disposed below the smoke collecting cover 11, and has a gap with the smoke collecting cover 11, and the gap is an air inlet passage (not shown) for external airflow to flow to an air suction opening of the smoke collecting cover 11.

In the embodiment, a sealed cavity (a flow dead zone) is formed among the connection plate 100 of the fan frame 10, the volute 20 and the lower guide plate 30 at the bottom of the volute 20 for effective utilization, and a first noise reduction hole 200 is formed in the volute 20 and a second noise reduction hole 300 is formed in the lower guide plate 30, so that the sealed cavity forms a first noise reduction cavity 50 capable of effectively reducing noise generated by a flowing air flow in the volute 20 and a flowing noise generated by an air flow in the fan frame 10 (outside the volute 20), and a grid plate matched with the lower guide plate 30 is not additionally added as in the prior art, so that the noise reduction effect of the area of the volute 20 at this position is ensured on the basis of saving the production cost. In a preferred embodiment, the first noise reduction chamber 50 is filled with a noise reduction member, and further, a dead space outside the volute 20 is utilized, so that the purpose of multiple noise reduction is achieved on the premise that the dead space does not occupy the flow passage space of the volute 20.

On the basis of the above embodiments, other embodiments can be obtained by replacing and improving the related technical features. For example, the deflector of the present embodiment can also be a flat plate or an arc plate structure inclined upwards from back to front according to different types of range hoods. For another example, the first silencer 41, the second silencer 42, the third silencer 43, and the fourth silencer 44 of the present embodiment may be made of other porous noise reduction materials besides sound absorbing cotton. For another example, the number of the first partition plates 81 may be three or more, so that more noise reduction chambers may be divided on the outer circumference of the annular wall 23 to improve the noise reduction effect.

Claims (12)

1. A centrifugal fan for a range hood, comprising:

a fan frame (10) having two connecting plates (100) arranged oppositely;

the volute (20) is arranged in the fan frame (10) and located between the two connecting plates (100), the volute (20) comprises a front cover plate (21), a rear cover plate (22) and a ring wall (23), and the ring wall (23) is arranged between the front cover plate (21) and the rear cover plate (22);

the lower guide plate (30) is arranged below the bottom of the annular wall (23) and is connected between the bottom of the front cover plate (21) and the bottom of the rear cover plate (22);

the method is characterized in that: the noise reduction device is characterized in that a first noise reduction cavity (50) is defined by the two connecting plates (100), the front cover plate (21), the rear cover plate (22), the annular wall (23) and the lower guide plate (30), a first noise reduction hole (200) communicated with the first noise reduction cavity (50) is formed in the volute (20), and a second noise reduction hole (300) communicated with the first noise reduction cavity (50) is formed in the lower guide plate (30).

2. The centrifugal fan for a range hood according to claim 1, wherein: the front cover plate (21), the rear cover plate (22) and the annular wall (23) are provided with the first noise reduction holes (200).

3. The centrifugal fan for a range hood according to claim 2, wherein: the lower guide plate (30) is arranged between the bottom of the front cover plate (21) and the bottom of the rear cover plate (22), and the middle part of the lower guide plate is concave downward and is V-shaped on the whole.

4. The centrifugal fan for a range hood according to any one of claims 1 to 3, wherein: the first noise reduction chamber (50) is filled with a noise reduction piece, the noise reduction piece comprises a first noise reduction piece (41) which is attached to the wall of the volute (20) and covers the first noise reduction hole (200) and a second noise reduction piece (42) which is attached to the inner wall of the lower guide plate (30) and covers the second noise reduction hole (300), and a first gap (500) is formed between the first noise reduction piece (41) and the second noise reduction piece (42) and serves as a sound insulation layer.

5. The centrifugal fan for a range hood according to any one of claims 1 to 3, wherein: still be equipped with first baffle (81) between rampart (23) and fan frame (10), first baffle (81) are followed the circumference interval arrangement of rampart (23), thereby will encircle rampart (23), front shroud (21), back shroud (22), lower guide plate (30) and the area that closes between fan frame (10) is for a plurality of noise reduction cavity along circumference, wherein, with the noise reduction cavity that lower guide plate (30) just right has constituted first noise reduction cavity (50).

6. The centrifugal fan for a range hood according to claim 5, wherein: the bottom of the volute (20) is also provided with a second partition plate (82) which is horizontally arranged, and the second partition plate (82) divides the first noise reduction chamber (50) into an upper noise reduction chamber (51) at the upper part and a lower noise reduction chamber (52) at the lower part.

7. The centrifugal fan for a range hood according to claim 6, wherein: the second baffle (82) is in contact with the bottom of the annular wall (23) to divide the upper noise reduction chamber (51) into a first chamber (511) on the left and a second chamber (512) on the right.

8. The centrifugal fan for a range hood according to claim 7, wherein: the noise reduction device further comprises a third partition plate (83) arranged in the lower noise reduction chamber (52), wherein the third partition plate (83) extends in the left-right direction and is vertically arranged so as to divide the lower noise reduction chamber (52) into a third chamber (521) at the front part and a fourth chamber (522) at the rear part.

9. The centrifugal fan for a range hood according to claim 6, wherein: the two first partition plates (81) are respectively arranged at the left side area position and the right side area position of the annular wall (23), so that a second noise reduction chamber (60) is defined by the fan frame (10), the front cover plate (21), the rear cover plate (22), the annular wall (23) and the first partition plate (81) at the upper left of the volute (20), a third noise reduction chamber (70) is defined by the fan frame (10), the front cover plate (21), the rear cover plate (22), the annular wall (23) and the first partition plate (81) at the upper right of the volute (20), the first noise reduction chamber (50) is defined by the two connecting plates (100), the front cover plate (21), the rear cover plate (22), the annular wall (23), the two first partition plates (81) and the lower guide plate (30) at the lower part of the volute (20), and the front cover plate (21), Be equipped with on back shroud (22) and rampart (23) with the communicating third of cavity (60) of making an uproar falls in the second falls hole (61) of making an uproar, be equipped with on front shroud (21), back shroud (22) and rampart (23) with the communicating fourth of cavity (70) of making an uproar falls in the third falls hole (71) of making an uproar, cavity (60) of making an uproar is filled in the second has third amortization piece (43), it has fourth amortization piece (44) to fill in cavity (70) of making an uproar falls in the third.

10. The centrifugal fan for a range hood according to claim 9, wherein: the noise reduction device further comprises a fourth partition plate (84) used for dividing the upper noise reduction chamber (51) into two chambers in the front-back direction, a fifth partition plate (85) used for dividing the second noise reduction chamber (60) into two chambers in the front-back direction, and a sixth partition plate (86) used for dividing the third noise reduction chamber (70) into two chambers in the front-back direction, wherein the fourth partition plate (84), the fifth partition plate (85) and the sixth partition plate (86) are located on the same plane.

11. The centrifugal fan for a range hood according to claim 10, wherein: the distance between the fourth partition plate (84) and the front cover plate (21) is marked as L1, the distance between the fourth partition plate (84) and the rear cover plate (22) is marked as L2, wherein, L1/L2 is more than or equal to 2 and less than or equal to 4.

12. A range hood to which the centrifugal fan for a range hood according to any one of claims 1 to 11 is applied.

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