CN212376965U - Current collector and centrifugal fan applying same - Google Patents

Abstract

The utility model discloses a collector, including being the annular first water conservancy diversion face of circle and being located the radial inboard second water conservancy diversion face of first water conservancy diversion face, the centre of first water conservancy diversion face and second water conservancy diversion face forms first air intake, the collector has the axis, the second water conservancy diversion face extends along the axis, first water conservancy diversion face is including being located the first tip in the radial outside and being located the radial inboard second tip, the second water conservancy diversion face is including being close to the third tip of first water conservancy diversion face and keeping away from the fourth tip of first water conservancy diversion face, on the axial cross-section of collector, the third tip to the fourth tip of second water conservancy diversion face are the curve that expands to the radial outside gradually. Also discloses a centrifugal fan applying the collector. Compared with the prior art, the utility model has the advantages of: the centrifugal fan can guide airflow into the impeller in a proper manner, prevent eddy current from being generated between the current collector and the front ring of the impeller, better solve the squeaking sound and effectively reduce the wind noise of the centrifugal fan.

Description

Current collector and centrifugal fan applying same

Technical Field

The utility model relates to a power device, especially a collector and applied centrifugal fan who has this collector.

Background

The domestic range hood utilizes the centrifugal fan to realize taking the oily air out of the kitchen and discharging to public flue or directly discharge the outdoor, in order to improve the air inflow condition, improve fan work efficiency, noise reduction, set up a collector at the fan import usually, the effect of collector is with the smooth guide impeller of fluid, use the collector can effectively improve the fan performance, at this moment the fan flow is great, work is under the design operating mode condition, the noise value is lower.

The application number is 201720503666.8 discloses a current collector, including wind-guiding face and stationary plane, the stationary plane personally submits the ring form, the wind-guiding face includes the radial wind-guiding face that radially extends the certain distance from the radial inboard of stationary plane, and the axial wind-guiding face that radially extends the certain distance in the axial from the radial inboard of radial wind-guiding face, form into the air intake in the middle of the wind-guiding face, the axial wind-guiding face has first end and second end in circumference, the axial wind-guiding face is the first wind-guiding section of straight and convex second wind-guiding section respectively between first end and second end, first wind-guiding section and second wind-guiding section constitute the confined annular.

After the airflow enters the volute from the axial direction, the airflow can flow out from the impeller in the radial direction only by turning a larger angle, so that the turbulence degree of the airflow is increased; the axial air guide surface is close to the front ring of the impeller, and eddy current is easily generated at the position between the axial air guide surface and the front ring of the impeller, so that edge noise is generated (squeaking is generated when the frequency is proper).

SUMMERY OF THE UTILITY MODEL

The utility model discloses the first technical problem that will solve is not enough to above-mentioned prior art existence, provides one kind and can prevent that the vortex between collector and the impeller front ring from producing to eliminate the collector of arris sound.

The utility model aims to solve the second technical problem that a centrifugal fan who has this collector is provided to use.

The utility model provides a technical scheme that above-mentioned first technical problem adopted does: the utility model provides a collector, is including being the annular first water conservancy diversion face of circle and being located the radial inboard second water conservancy diversion face of first water conservancy diversion face, the centre of first water conservancy diversion face and second water conservancy diversion face forms first air intake, collector has the axis, the second water conservancy diversion face extends along the axis, first water conservancy diversion face is including being located the radial outside first end and being located the radial inboard second end, the second water conservancy diversion face is including being close to the third end of first water conservancy diversion face and keeping away from the fourth end of first water conservancy diversion face, its characterized in that: and on the axial cross section of the collector, the third end part to the fourth end part of the second flow guiding surface are curves gradually expanding towards the radial outer side.

In order to avoid the eddy and reduce the noise when the current collector runs with large wind, on the axial section of the current collector, the first end part of the first flow guide surface is inclined to the second end part, the direction of the inclination from the first end part to the second end part is opposite to the extending direction of the second flow guide surface, and the second end part and the third end part are in smooth transition.

The utility model provides a technical scheme that above-mentioned second technical problem adopted does: the utility model provides an use centrifugal fan that has this collector, includes the spiral case and sets up the impeller in the spiral case, seted up the second air intake on the spiral case, its characterized in that: the current collector is arranged at the second air inlet.

In order to guide the airflow into the impeller, the impeller comprises blades and a front ring which is arranged corresponding to the second air inlet and used for fixing the blades, the front ring is annular, and the fourth end part of the second flow guide surface is arranged between the front ring and the second air inlet or penetrates through the radial inner side of the front ring to enter the impeller.

In order to eliminate edge noise formed by vortex generated between the second guide surface and the front ring of the impeller, the axial distance between the fourth end part of the second guide surface and the front ring is H, and H is less than or equal to 4 mm.

In order to enable the second flow guide surface to have a proper expansion angle, on the axial section of the collector, the included angle between the tangent of the end point of the fourth end part of the second flow guide surface on the section and the axis of the impeller is alpha, and alpha is more than or equal to 5 degrees.

Compared with the prior art, the utility model has the advantages of: by arranging the flow collecting ring to be a curve gradually expanding towards the radial outer side, when the flow collecting ring is applied to a centrifugal fan, airflow can be guided into an impeller along the same trend, vortex is prevented from being generated between the flow collector and a front ring of the impeller, squealing sound can be better solved, and wind noise of the centrifugal fan can be effectively reduced; by controlling the distance between the collector and the front ring of the impeller, the generation of eddy currents is further reduced.

Drawings

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

fig. 2 is an exploded view of a centrifugal fan according to an embodiment of the present invention;

fig. 3 is a sectional view of a centrifugal fan according to an embodiment of the present invention;

fig. 4 is an enlarged view of a portion I of fig. 3.

Detailed Description

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

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.

Referring to fig. 1 and 2, a centrifugal fan includes a collector 1, a volute 21, and an impeller 22 disposed within the volute 21. The header 1 and the impeller 22 are arranged coaxially (both axes are X, see fig. 3). The header 1 comprises a first flow guiding surface 11 in the shape of a circular ring and a second flow guiding surface 12 located radially inside the first flow guiding surface 11. The first flow guide surface 11 and the second flow guide surface 12 form a first air inlet 13 in the middle, and the second flow guide surface 12 extends into the volute 21 along the axis X of the header 1.

The volute casing 21 is provided with a second air inlet 211, the impeller 22 comprises blades 221, and a front ring 222 and a rear ring 223 which are respectively arranged at two ends of the blades 221 and used for fixing the blades 221, and the front ring 222 and the rear ring 223 are both in a circular ring shape. The collector 1 is disposed corresponding to the second air inlet 211, and the second air inlet 211 is communicated with the first air inlet 13.

The centrifugal fan further comprises an oil guide plate 3, the oil guide plate 3 can be arranged on one side of the volute casing 21, where the second air inlet 211 is formed, the current collector 1 can be arranged on the oil guide plate 3 and integrally formed with the oil guide plate, or can be directly arranged at the second air inlet 211 of the volute casing 21.

Referring to fig. 4, the first flow guiding surface 11 comprises a first end 111 located radially outside and a second end 112 located radially inside, and the second flow guiding surface 12 comprises a third end 121 close to the first flow guiding surface 11 and a fourth end 122 remote from the first flow guiding surface 11. In an axial cross section of the header 1, the first end 111 to the second end 112 of the first flow guiding surface 11 is inclined, and the direction inclined from the first end 111 to the second end 112 is opposite to the extending direction of the second flow guiding surface 12, i.e. inclined away from the impeller 22. The third end 121 to the fourth end 122 of the second guide surface 12 may be curved and expanded outward in the radial direction toward the impeller 22. The second end 112 of the first guide surface 11 and the third end 121 of the second guide surface 12 are in smooth transition. The first guide surface 11 with the oblique section can slowly transit high-speed wind to the second guide surface 12, and compared with a curved surface, the oblique straight surface is not easy to generate vortex, so that noise can be reduced when the wind turbine runs at a high wind quantity.

Referring to fig. 3 to 4, in an axial cross section of the collector, an included angle α between a tangent of an end point of the fourth end portion 122 of the second guide surface 12 on the cross section and the axis X of the impeller 22 is greater than or equal to 5 ° (i.e., the expansion angle of the second guide surface 12 is greater than or equal to 10 °). The fourth end 122 of the second guide surface 12 is disposed between the front ring 222 and the second air inlet 211 or passes through the radial inner side of the front ring 222 to enter the impeller 22. The axial distance between the fourth end 122 of the second guiding surface 12 and the front ring 222 is H, preferably, H is less than or equal to 4 mm.

The utility model discloses a be the arc that gradually expands to the outside and control fourth end 122 of second water conservancy diversion face 12 and the absolute distance between preceding circle 222 with second water conservancy diversion face 12 towards the impeller direction to can be fine with the leading-in impeller 22 of air current, prevent that the vortex between fourth end 122 of second water conservancy diversion face 12 and preceding circle 222 from producing, sound is made an uproar to the solution that can be better, and can effectual reduction centrifugal fan 2's wind noise.

Claims (6)

1. The utility model provides a collector, is including being the annular first water conservancy diversion face (11) of circle and being located the radial inboard second water conservancy diversion face (12) of first water conservancy diversion face (11), the centre of first water conservancy diversion face (11) and second water conservancy diversion face (12) forms first air intake (13), the collector has axis (X), second water conservancy diversion face (12) extend along axis (X), first water conservancy diversion face (11) are including being located radial outside first tip (111) and being located radial inboard second tip (112), second water conservancy diversion face (12) are including being close to first water conservancy diversion face (11) third tip (121) and keeping away from first water conservancy diversion face (11) fourth tip (122), its characterized in that: in the axial cross section of the collector, the third end part (121) to the fourth end part (122) of the second flow guiding surface (12) are in a curve gradually expanding towards the radial outer side.

2. The current collector of claim 1, wherein: in the axial cross section of the collector, the first end part (111) to the second end part (112) of the first flow guide surface (11) is oblique, the direction of inclination from the first end part (111) to the second end part (112) is opposite to the extending direction of the second flow guide surface (12), and the second end part (112) and the third end part (121) are in smooth transition.

3. A centrifugal fan applying the collector of claim 1 or 2, comprising a volute (21) and an impeller (22) disposed in the volute (21), wherein the volute (21) is provided with a second air inlet (211), and the centrifugal fan is characterized in that: the collector is arranged at the second air inlet (211).

4. The centrifugal fan of claim 3, wherein: the impeller (22) comprises blades (221) and a front ring (222) which is arranged corresponding to the second air inlet (211) and used for fixing the blades (221), the front ring (222) is annular, and the fourth end portion (122) of the second flow guide surface (12) is arranged between the front ring (222) and the second air inlet (211) or penetrates through the radial inner side of the front ring (222) to enter the impeller (22).

5. The centrifugal fan of claim 4, wherein: the axial distance between the fourth end (122) of the second flow guide surface (12) and the front ring (222) is H, and H is less than or equal to 4 mm.

6. The centrifugal fan according to any one of claims 3 to 5, wherein: on the axial section of the collector, the included angle between the tangent of the end point of the fourth end part (122) of the second flow guide surface (12) on the section and the axis of the impeller (22) is alpha, and alpha is more than or equal to 5 degrees.

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