CN211370824U - Impeller of double-air-inlet centrifugal fan - Google Patents

Abstract

The utility model discloses a two air inlet centrifugal fan's impeller, including preceding circle, with the back circle that the coaxial interval of preceding circle set up and set up the blade between preceding circle and back circle, be provided with rim plate, its characterized in that between inboard, preceding circle and the back circle of blade: the impeller still includes the solid fixed ring fixed with the rim plate, be connected with two at least first connecting portion between solid fixed ring and the preceding circle, gu be connected with two at least second connecting portion between fixed ring and the back circle, form first ventilation hole between the adjacent first connecting portion, form the second ventilation hole between the adjacent second connecting portion. Compared with the prior art, the utility model has the advantages of: the inlet and outlet angles of the blades can be closer to the design size, the radial shaking amount during operation is small, the structural rigidity is strong and stable, and the long-term high-rotation-speed operation can be better adapted.

Description

Impeller of double-air-inlet centrifugal fan

Technical Field

The utility model relates to a power device, especially a two air inlet centrifugal fan's impeller.

Background

The multi-wing centrifugal fan is the main power system of cooking fume exhauster and other ventilation equipment, and has the features of compact structure, low noise, high pressure coefficient, great flow coefficient, etc. The energy conversion of the fan is mainly realized by the work of the impeller, so the performance of the impeller directly influences the characteristics of the ventilation equipment.

For example, the invention patent in chinese application No. 201910147712.9 discloses an impeller, a fan and a range hood, wherein the impeller includes a wheel disc and a plurality of fan blades, the plurality of fan blades are arranged at intervals along the circumferential direction of the wheel disc, an inner cavity is arranged in the wheel disc and an air inlet hole communicated with the inner cavity is arranged on the wheel disc, a cavity is arranged in the fan blade and an air outlet hole communicated with the cavity is arranged on the surface of the fan blade, and the inner cavity of the disc is communicated with the cavity of the fan blade.

Along with range hood's effective amount of wind is higher and higher, and the impeller rotational speed is also higher and higher, also higher and higher to the dynamic balance of impeller and the demand of structural rigidity, as shown in the above-mentioned patent drawing, only there is a fixed point between each fan blade and the central disk, and preceding circle only plays the effect at fixed fan blade both ends with the back circle, sees from the longitudinal section, is equivalent to the fixed knot structure of a "T" shape, and the overall structure rigidity is poor between preceding circle and the central disk around, appears range hood shake problem easily under the operation of long-term high rotational speed. The middle disc rolling can cause the deformation of the fan blades in different degrees, the matching verticality of the fan blades and the middle disc cannot be guaranteed, the coaxiality of the front ring and the rear ring of the impeller and the middle disc is also guaranteed, and the impeller is easy to misplace, so that the radial shaking amount of the impeller in actual operation is large. In addition, the parallelism of the fan blades relative to the rotation axis of the impeller cannot be guaranteed, so that the inlet and outlet angles of the fan blades are large in deviation from the design, and the air volume and the air pressure of the impeller are directly influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to the not enough of above-mentioned prior art, provide one kind and can make the exit angle of blade be close design size, when operation radial shake the momentum little, structural rigidity is strong and stable, can be better adapt to the impeller of the long-term high rotational speed centrifugal fan of two air intakes of operation.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a two air inlet centrifugal fan's impeller, includes preceding circle, circle the back circle that sets up with preceding coaxial interval and set up the blade between circle and back circle in the front, be provided with rim plate, its characterized in that between inboard, preceding circle and the back circle of blade: the impeller still includes the solid fixed ring fixed with the rim plate, be connected with two at least first connecting portion between solid fixed ring and the preceding circle, gu be connected with two at least second connecting portion between fixed ring and the back circle, form first ventilation hole between the adjacent first connecting portion, form the second ventilation hole between the adjacent second connecting portion.

The front ring, the rear ring and the wheel disc are fixed by at least two rivets penetrating through the wheel disc and the fixing ring, and the rivets are arranged at intervals in the circumferential direction of the fixing ring.

The front ring is provided with a first through hole for one end of the blade to penetrate through, the rear ring is provided with a second through hole for the other end of the blade to penetrate through, one end of the blade penetrates through the first through hole and then bends to one side to form a first pressure head which is abutted against the front side of the front ring, and the other end of the blade penetrates through the second through hole and then bends to one side to form a second pressure head which is abutted against the rear side of the rear ring.

Each first connecting portion is formed with first stator, each second connecting portion is formed with the second stator, first stator and second stator constitute axial compressor structure respectively.

Compared with the prior art, the utility model has the advantages of: the middle disc is eliminated, and the middle disc is connected with the fixed ring through the first connecting part and the second connecting part and then is connected and fixed with the wheel disc, so that a delta-shaped closed structure is formed among the front ring, the rear ring and the blades, the structure ensures the position precision of the front ring and the rear ring relative to the wheel disc, the radial runout of the impeller can be controlled to be very small, the parallelism of the blades relative to the rotation axis of the impeller can be ensured, the inlet and outlet angles of the blades are closer to the design size, and the structure has strong rigidity and stability and can better adapt to long-term high-rotation-speed operation; through being formed with first stator on the first connecting portion, be formed with the second stator on the second connecting portion, first stator and second stator constitute axial compressor structure respectively to can accelerate the inside air current flow of impeller, more be favorable to the discharge of air current, improve the impeller performance.

Drawings

FIG. 1 is a schematic view of a prior art impeller;

fig. 2 is a schematic view of an impeller of a double intake centrifugal fan according to a first embodiment of the present invention;

fig. 3 is a side view of an impeller of a double intake centrifugal fan according to a first embodiment of the present invention;

fig. 4 is an exploded view of an impeller of a double intake centrifugal fan according to a first embodiment of the present invention;

fig. 5 is a schematic view of an impeller of a double intake centrifugal fan according to a second embodiment of the present invention;

fig. 6 is a side view of an impeller of a double intake centrifugal fan according to a second embodiment of the present invention;

fig. 7 is an exploded view of an impeller of a double intake centrifugal fan according to a second embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.

In the description of the present invention, it is to be understood that the terms "center," "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 a generic and descriptive sense only and not for purposes of limitation, as the disclosed embodiments of the invention may be oriented in different directions and the directional terms are intended to be illustrative and should not be construed as limiting, such as "upper" and "lower" are not necessarily limited to directions 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.

Example one

Referring to fig. 2, the impeller of the double-air inlet centrifugal fan comprises a front ring 1, a rear ring 2 coaxially arranged with the front ring 1 at an interval, and blades 3 arranged between the front ring 1 and the rear ring 2, wherein a wheel disc 4 is arranged on the inner side of each blade 3 and between the front ring 1 and the rear ring 2. The vanes 3 have at least two, and are arranged at intervals along the axial direction of the front ring 1 or the rear ring 2.

The impeller still includes the solid fixed ring 7 fixed with rim plate 4, is connected with two at least first connecting portion 5 between solid fixed ring 7 and the preceding circle 1, is connected with two at least second connecting portion 6 between solid fixed ring 7 and the back circle 2, and first connecting portion 5 and second connecting portion 6 can all be shaft-like to be radial distribution. First ventilation holes 51 are formed between adjacent first connection portions 5, and second ventilation holes 61 are formed between adjacent second connection portions 6. The front ring 1, the rear ring 2 and the wheel disc 4 are fixed by at least two rivets 10 passing through the wheel disc 4 and the fixing ring 7, the rivets 10 being arranged at intervals in the circumferential direction of the fixing ring 7. The rivet 10 is used for positioning and fixing, the structure is reliable, and the positioning is accurate.

Referring to fig. 4, a first through hole 11 for one end of the blade 3 to pass through is formed in the circumferential direction of the front ring 1, and a second through hole 21 for the other end of the blade 3 to pass through is formed in the circumferential direction of the rear ring 2. One end of the blade 3 passes through the first through hole 11 and then bends to one side to form a first pressure head 31 which is abutted against the front side of the front ring 1, and the other end of the blade 3 passes through the second through hole 21 and then bends to one side to form a second pressure head 32 which is abutted against the rear side of the rear ring 2.

Referring to fig. 1 and 3, a closed structure in a shape of "Δ" is formed between the front ring 1, the rear ring 2 and the blades 3, as seen from the longitudinal section, and is more stable in structure and better adapted to long-term high-speed operation, compared with the "T" structure formed between the front ring 1 ', the rear ring 2', the blades 3 'and the middle disc 4' of the prior art in fig. 1. And the structure ensures the position accuracy of the front ring 1 and the rear ring 2 relative to the wheel disc 4, the radial runout of the impeller is small, the parallelism of the blades 3 relative to the rotation axis of the impeller is also ensured, and the inlet and outlet angles of the blades 3 are closer to the design size.

Example two

Referring to fig. 5 to 7, the present embodiment is different from the first embodiment in that: first guide vanes 8 are formed on each first connecting portion 5, second guide vanes 9 are formed on each second connecting portion 6, and the first guide vanes 8 and the second guide vanes 9 respectively form an axial flow structure, so that the flow of air flow in the impeller can be accelerated, the air flow can be discharged more conveniently, and the performance of the impeller is improved.

Claims (4)

1. The utility model provides a two air inlet centrifugal fan's impeller, includes preceding circle (1), circle (2) and set up in the front between circle (1) and back circle (2) the back circle (2) that set up with preceding circle (1) coaxial interval, be provided with rim plate (4), its characterized in that between inboard, preceding circle (1) and the back circle (2) of blade (3): the impeller still includes solid fixed ring (7) fixed with rim plate (4), gu be connected with two at least first connecting portion (5) between fixed ring (7) and preceding circle (1), gu be connected with two at least second connecting portion (6) between fixed ring (7) and back circle (2), form first ventilation hole (51) between adjacent first connecting portion (5), form second ventilation hole (61) between adjacent second connecting portion (6).

2. The impeller of the double-air-inlet centrifugal fan as claimed in claim 1, wherein: the front ring (1), the rear ring (2) and the wheel disc (4) are fixed by at least two rivets (10) penetrating through the wheel disc (4) and the fixing ring (7), and the rivets (10) are arranged at intervals in the circumferential direction of the fixing ring (7).

3. The impeller of the double-air-inlet centrifugal fan as claimed in claim 1 or 2, wherein: offer first through-hole (11) that wherein one end of confession blade (3) passed on preceding circle (1), offer second through-hole (21) that the other end that supplies blade (3) to pass on back circle (2), the wherein one end of blade (3) is passed behind first through-hole (11) and to a lateral buckling, is formed first pressure head (31) that offsets with the front side of preceding circle (1), the other end of blade (3) passes behind second through-hole (21) and to a lateral buckling, is formed second pressure head (32) that offsets with the rear side of back circle (2).

4. The impeller of the double-air-inlet centrifugal fan as claimed in claim 1 or 2, wherein: each first connecting portion (5) is provided with a first guide vane (8), each second connecting portion (6) is provided with a second guide vane (9), and the first guide vane (8) and the second guide vane (9) respectively form an axial flow structure.

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