CN218293944U - Impeller of multi-wing centrifugal fan, multi-wing centrifugal fan and range hood - Google Patents

Abstract

The utility model discloses a multi-wing centrifugal fan's impeller, include: a front plate; the rear disc is arranged opposite to the front disc; the middle disc is arranged between the front disc and the rear disc; the blades are arranged between the front disc and the middle disc and between the middle disc and the rear disc and are distributed at intervals along the circumferential direction; the method is characterized in that: a plurality of flow guide holes penetrating through the wall thickness of the middle disc are distributed on the middle disc. A plurality of flow guide holes penetrating through the wall thickness of the middle disc are distributed on the middle disc, and the flow guide holes guide the overflowing air flow on two sides of the middle disc, so that the opposite impact of the air flow on two sides of the middle disc can be effectively reduced, the air flow vortex is reduced, and the noise of the impeller is reduced; meanwhile, sound waves can be continuously refracted and rubbed in the diversion holes, and sound energy is reduced, so that noise is reduced.

Description

Impeller of multi-wing centrifugal fan, multi-wing centrifugal fan and range hood

Technical Field

The utility model belongs to the technical field of the fan, concretely relates to multi-wing centrifugal fan's impeller and applied multi-wing centrifugal fan who has this impeller.

Background

The centrifugal fan is a common air supply device, and the centrifugal fan accelerates air entering an impeller axially by utilizing an impeller rotating at a high speed by means of input mechanical energy, then decelerates and changes direction, flows out of the impeller radially, and finally flows out of an air outlet of a volute. The multi-wing centrifugal fan has the outstanding characteristics of compact structure, high pressure coefficient, low noise and large flow coefficient, and is widely applied to the range hood. The multi-wing centrifugal fan of the existing range hood mostly adopts impellers with air inlet on two sides so as to effectively improve the flow of the range hood. A double-sided inlet impeller typically includes a front disk, a rear disk, a center disk positioned between the front and rear disks, and vanes. The air current of well dish both sides exists unbalance, and the air current strikes the well dish and produces the swirl, causes the air current unstable, and the dynamic balance of impeller operation in-process also can be influenced to the impact force of difference simultaneously, and the large scale swirl that produces also can produce the vortex noise. In order to solve the problem, 4-8 vent holes are commonly adopted in the conventional middle disc, air flows at two sides can be communicated, the air flows at two sides of the middle disc are balanced, but the impeller of the design still has noise sharp points at the frequency doubling positions of corresponding spokes, and the noise is high; and two survey air currents offset, also can not avoid producing extra swirl, further increased the noise.

For example, the Chinese patent invention with publication number CN110145488A (application number 201910354996.9) discloses an impeller assembly for a centrifugal fan, which comprises a central disc, wherein the impeller assembly is provided with an axis, the central disc is provided with a center, the central disc comprises a wheel disc mounting part in the middle, a connecting part positioned at the periphery of the wheel disc mounting part and a blade mounting part positioned at the periphery of the connecting part, the blade mounting part is provided with a blade slot, the wheel disc mounting part integrally protrudes along the axis direction relative to the connecting part, the connecting part is provided with a plurality of pressing tables arranged at intervals along the circumferential direction, the pressing tables protrude along the axis direction and are annular, and ventilation holes are formed in the pressing tables. The setting in above-mentioned ventilation hole can realize the adaptation degree of different front and back air inlet ratios under the different operating mode, and automatic balance air inlet ratio still has the great problem of noise.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the first technical problem that a multi-wing centrifugal fan's impeller that can guide both sides air current steadily to pass through the center, reduce both sides air current offset is provided.

The utility model aims to solve the second technical problem that a multi-wing centrifugal fan who uses above-mentioned impeller is provided.

The utility model aims to solve the third technical problem that a smoking lampblack absorber that uses above-mentioned multiple wing centrifugal fan is provided.

The utility model provides a technical scheme that first technical problem adopted does: an impeller for a multi-bladed centrifugal fan comprising:

a front plate;

the rear disc is arranged opposite to the front disc;

the middle disc is arranged between the front disc and the rear disc;

the blades are arranged between the front disc and the middle disc and between the middle disc and the rear disc and are distributed at intervals along the circumferential direction;

the method is characterized in that: a plurality of flow guide holes penetrating through the wall thickness of the middle disc are distributed on the middle disc.

In order to further improve the drainage effect of the air flow on the two sides of the middle disc, preferably, at least two groups of the flow guide holes are arranged at intervals along the circumferential direction, and each group of the flow guide holes is provided with at least two flow guide holes arranged at intervals along the radial direction.

In order to adapt to the flow guiding effect of different areas, the air flow quantity of the air flow close to the blade path is larger, and preferably, in at least one group of flow guiding holes, the hole diameter of each flow guiding hole is gradually reduced from inside to outside along the radial direction.

In order to adapt to the flow guiding effect of different areas, the closer to the blade path, the greater the air flow, preferably, in at least one group of flow guiding holes, the distance between two adjacent flow guiding holes is gradually reduced from inside to outside along the radial direction.

In order to further improve the drainage effect of the air flow on the two sides of the middle disc, preferably, the middle disc is provided with an area which is gradually inclined towards the rear disc from inside to outside along the radial direction, and at least part of the flow guide holes are positioned in the area.

For further noise reduction, as preferred, the central authorities include tandem interconnect's first part and second part, at least part of this second part with first part interval and injecing the cavity jointly, it has the sound piece of inhaling to fill in this cavity, should inhale the sound piece and be equipped with a plurality of third through-holes, first part on be equipped with respectively with a plurality of first through-holes that each third through-hole corresponds the intercommunication, the second part on be equipped with respectively with a plurality of second through-holes that each third through-hole corresponds the intercommunication, just third through-hole, the first through-hole that corresponds and the second through-hole that corresponds form jointly the water conservancy diversion hole.

Further, as preferred, the first part be close to the head disc set up to radially from inside to outside have wheel dish portion, connecting portion in proper order and with the blade installation department that the blade restraint is in the same place, first through-hole locate on the connecting portion, the second part be the ring-type, with the connecting portion inject jointly the cavity.

Preferably, the blades arranged between the front disk and the middle disk and the blades arranged at the corresponding positions between the middle disk and the rear disk are the same blades penetrating through the corresponding holes in the middle disk.

The utility model provides a technical scheme that second technical problem adopted does: the utility model provides a multi-wing centrifugal fan which characterized in that: the impeller of the multi-wing centrifugal fan is applied.

The utility model provides a technical scheme that third technical problem adopted does: a range hood, its characterized in that: the impeller of the multi-wing centrifugal fan is applied.

Compared with the prior art, the utility model has the advantages of: a plurality of flow guide holes penetrating through the wall thickness of the middle disc are distributed on the middle disc, and the flow guide holes guide the overflowing air flow on two sides of the middle disc, so that the opposite impact of the air flow on two sides of the middle disc can be effectively reduced, the air flow vortex is reduced, and the noise of the impeller is reduced; meanwhile, sound waves can be continuously refracted and rubbed in the diversion holes, and sound energy is reduced, so that noise is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a middle plate in an embodiment of the present invention.

Fig. 2 is an enlarged view at I in fig. 1.

Fig. 3 is a schematic structural diagram of another view angle of the middle plate according to the embodiment of the present invention.

Fig. 4 is an exploded view of the middle plate according to the embodiment of the present invention.

Fig. 5 is a cross-sectional view of the middle plate in the embodiment of the present invention.

Fig. 6 is an enlarged view of Π in fig. 5.

Fig. 7 is a schematic structural diagram of an impeller according to an embodiment of the present invention.

Fig. 8 is a schematic structural view of the oil smoke suction in the embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

Referring to fig. 7, the impeller of the multi-blade centrifugal fan in the present embodiment includes a front disk 1, a rear disk 2, a middle disk 3, and blades 5. The rear disc 2 is arranged opposite to the front disc 1; the middle disc 3 is arranged between the front disc 1 and the rear disc 2; the blades 5 are arranged between the front disk 1 and the middle disk 3 and between the middle disk 3 and the rear disk 2 and are distributed at intervals along the circumferential direction, and the blades 5 arranged between the front disk 1 and the middle disk 3 and the blades 5 arranged at corresponding positions between the middle disk 3 and the rear disk 2 are the same blades 5 penetrating through corresponding holes in the middle disk 3.

Referring to fig. 1 to 6, a plurality of flow guide holes 301 penetrating through the wall thickness of the middle disc 3 are distributed on the middle disc 3, at least two groups of flow guide holes 301 are arranged at intervals along the circumferential direction, and each group of flow guide holes 301 is provided with at least two flow guide holes 301 arranged at intervals along the radial direction. In each group of the flow guide holes 301, the diameter of each flow guide hole 301 is gradually reduced from inside to outside along the radial direction. In each group of the guide holes 301, the distance between two adjacent guide holes 301 gradually decreases from inside to outside along the radial direction. In this embodiment, the intermediate tray 3 comprises a first part 31 and a second part 32 connected to each other in tandem, the first part 31 being arranged close to the front tray 1 and having, in order from the inside to the outside in the radial direction, a tray part 311, a connecting part 312, and a blade mounting part 313 to which the blades 5 are constrained. The second member 32 is annular and defines a cavity 303 with the connecting portion 312. The connecting portion 312 and the second member 32 are inclined from the inside to the outside in the radial direction of the middle disc 3 toward the rear disc 2 to form an inclined area 302. The cavity 303 is filled with a sound absorbing member 4, the sound absorbing member 4 is provided with a plurality of third through holes 41, the connecting portion 312 is provided with a plurality of first through holes 311a correspondingly communicated with the third through holes 41, the second component 32 is provided with a plurality of second through holes 321 correspondingly communicated with the third through holes 41, and the third through holes 41, the corresponding first through holes 311a and the corresponding second through holes 321 form a flow guide hole 301 together.

Referring to fig. 8, the range hood includes a smoke collecting hood 100 and a fan frame 200 disposed above the smoke collecting hood 100, and a multi-blade centrifugal fan (not shown) of the present embodiment is disposed in the fan frame 200.

Claims (10)

1. An impeller for a multi-bladed centrifugal fan comprising:

a front plate (1);

the rear disc (2) is arranged opposite to the front disc (1);

the middle disc (3) is arranged between the front disc (1) and the rear disc (2);

the blades (5) are arranged between the front disc (1) and the middle disc (3) and between the middle disc (3) and the rear disc (2) and are distributed at intervals along the circumferential direction;

the method is characterized in that: a plurality of flow guide holes (301) penetrating through the wall thickness of the middle disc (3) are distributed on the middle disc.

2. The impeller of claim 1, wherein: the flow guide holes (301) are at least two groups and are arranged at intervals along the circumferential direction, and each group is provided with at least two flow guide holes (301) and is arranged at intervals along the radial direction.

3. The impeller of claim 2, wherein: in at least one group of the guide holes (301), the diameter of each guide hole (301) is gradually reduced from inside to outside along the radial direction.

4. The impeller of claim 2, wherein: in at least one group of the guide holes (301), the distance between two adjacent guide holes (301) is gradually reduced from inside to outside along the radial direction.

5. The impeller of claim 1, wherein: the middle disc (3) is provided with an area (302) which gradually inclines towards the rear disc (2) from inside to outside along the radial direction, and at least part of the diversion holes (301) are positioned in the area (302).

6. The impeller of claim 1, wherein: the well dish (3) include behind one another interconnect's first part (31) and second part (32), at least part of this second part (32) with first part (31) interval and inject cavity (303) jointly, it has sound absorbing member (4) to fill in this cavity (303), this sound absorbing member (4) are equipped with a plurality of third through-holes (41), first part (31) on be equipped with respectively with a plurality of first through-holes (311 a) that each third through-hole (41) corresponds the intercommunication, second part (32) on be equipped with respectively with a plurality of second through-holes (321) that each third through-hole (41) corresponds the intercommunication, just third through-hole (41), corresponding first through-hole (311 a) and corresponding second through-hole (321) form jointly water conservancy diversion hole (301).

7. The impeller of claim 6, wherein: first part (31) be close to preceding dish (1) set up to radially from inside to outside have wheel dish portion (311), connecting portion (312) in proper order and with blade (5) retrain blade installation department (313) together, first through-hole (311 a) locate on connecting portion (312), second part (32) be annular, and with connecting portion (312) inject jointly cavity (303).

8. The impeller according to any one of claims 1 to 7, characterized in that: locate preceding dish (1) and well dish (3) between blade (5) and locate well dish (3) between corresponding position department blade (5) be same blade (5) that run through corresponding hole on well dish (3) with back dish (2).

9. The utility model provides a multi-wing centrifugal fan which characterized in that: impeller for a centrifugal fan with multiple blades according to any one of claims 1 to 8.

10. A range hood, its characterized in that: use of an impeller with a multi-bladed centrifugal fan according to claim 9.

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