CN215860861U

CN215860861U - Current collector, centrifugal fan and range hood

Info

Publication number: CN215860861U
Application number: CN202121491566.0U
Authority: CN
Inventors: 任富佳; 鲍明; 孟君; 郑桐福; 余国成; 周海昕
Original assignee: Hangzhou Robam Appliances Co Ltd
Current assignee: Hangzhou Robam Appliances Co Ltd
Priority date: 2021-07-01
Filing date: 2021-07-01
Publication date: 2022-02-18
Anticipated expiration: 2031-07-01

Abstract

The utility model provides a current collector, a centrifugal fan and a range hood, and relates to the technical field of range hoods, wherein the current collector comprises a guide ring, the guide ring is used for guiding airflow flowing from bottom to top to move along the axial direction of the current collector, and the current collector comprises: the guide vane is connected to the lower part of the guide ring; the guide vane is positioned on the inner side of the guide ring, a gap is formed between the guide vane and the guide ring in the radial direction of the current collector, and the guide vane is closer to the air outlet side of the current collector relative to the guide ring along the axial direction of the current collector; the air inlet side of the current collector faces the air outlet side, and the flow deflector inclines towards the lower end of the current collector. The guide vanes play a role in pertinence bending and guiding the inlet oil smoke in the lower end area of the air inlet of the fan, weaken the flow separation and vortex motion of oil smoke gas flow in a large bending flow area and reduce the vortex noise.

Description

Current collector, centrifugal fan and range hood

Technical Field

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

Background

The range hood is regarded as the important improvement instrument of kitchen culinary art environment, and its aerodynamic performance, noise etc. aspect are receiving more and more consumer's attention.

The range hood comprises a fan and a current collector, wherein an air inlet of the fan is positioned on the side surface of the fan, the current collector is arranged at the air inlet of the fan and is annular, the current collector comprises a radial air guide surface, an arc transition surface and an axial air guide surface which are continuously arranged, and the current collector can guide airflow flowing from bottom to top to move along the transverse direction to enter the fan, so that the purposes of guiding and reducing noise are achieved.

However, the upward flowing oil smoke near the lower area of the air inlet of the fan is not easy to enter the impeller flow channel at the lower position through large flow bending, and the fan impeller always keeps high-speed rotation, so that the flow separation and vortex motion are easy to generate in the area near the lower part of the air inlet of the fan, and vortex noise is brought. Meanwhile, because the air inlet flow at the end part of the impeller flow channel is very small, the axial air inlet of the impeller flow channel is uneven, so that the working efficiency of the impeller is low, and further the pneumatic performance and the working noise of the fan are directly influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a current collector, a centrifugal fan and a range hood so as to solve the technical problem of high noise of the centrifugal fan in the existing range hood.

In a first aspect, an embodiment of the present invention provides a current collector, where the current collector includes a guiding ring, and the guiding ring is configured to guide an airflow flowing from bottom to top to move along an axial direction of the current collector, and the current collector includes: the guide vane is connected to the lower part of the guide ring; the flow deflector is positioned on the inner side of the flow guide ring, and a gap is formed between the flow deflector and the flow guide ring in the radial direction of the current collector; and along the axial direction of the current collector, the air outlet end of the flow deflector is positioned at the air outlet side of the air outlet end of the flow guide ring;

the air inlet side of the current collector faces the air outlet side, and the flow deflector inclines towards the lower end of the current collector.

Further, the guide vane extends along an arc in a bending way, and the bending curvature of the guide vane is the same as that of the guide ring.

Furthermore, the cross section of the flow deflector is arc-shaped, and the arc is bent towards the direction back to the lower part of the flow guide ring.

Furthermore, the two ends of the flow deflector are connected with the flow guiding ring through connecting pins, and the flow deflector, the connecting pins and the flow guiding ring are integrally formed.

Further, the range of the circumferential angle θ 1 between the end side of the flow deflector close to the volute air outlet and the vertical direction is as follows: theta 1 is more than or equal to 30 degrees and less than or equal to 60 degrees; the range of the circumferential angle theta 2 between the end side of the flow deflector, which is far away from the volute air outlet, and the vertical direction is as follows: theta 2 is more than or equal to 45 degrees and less than or equal to 75 degrees.

Further, the projection of the air inlet end of the flow deflector to the outside along the radial direction falls on the flow deflector ring;

or the projection of the air inlet end of the flow deflector to the outside along the radial direction and the air outlet end of the flow guide ring are positioned at the same position in the axial direction of the current collector;

or the projection of the air inlet end of the guide vane along the radial outward direction falls on the air outlet side of the air outlet end of the guide ring.

Furthermore, the water conservancy diversion circle includes towards the convex arc wind-guiding surface of the air inlet side of collector, the border that the arc wind-guiding surface is close to the collector axle center is provided with along the axial of collector to the air-out side direction extension of collector axial wind-guiding surface.

Furthermore, along the axial direction of the current collector, the edge of the flow deflector close to the flow guide ring and the edge of the axial air guide surface close to the air outlet side of the current collector are at the same axial position.

Furthermore, the current collector also comprises an annular mounting edge positioned outside the flow guide ring, the plane of the annular mounting edge is vertical to the axial direction of the current collector, and the annular mounting edge is connected with the arc-shaped air guide surface; and the annular mounting edge is provided with a mounting hole.

In a second aspect, an embodiment of the present invention provides a centrifugal fan, where the centrifugal fan includes the above-mentioned collector.

In a third aspect, the range hood provided by the embodiment of the utility model includes the centrifugal fan.

The flow guiding principle of the current collector provided by the embodiment of the utility model is as follows: when the fan is started, airflow on the air inlet side of the current collector flows to the guide ring from bottom to top, the guide ring guides the flow direction of the airflow to move along the axial direction of the current collector, the airflow moves to the guide sheet along the axial direction, part of the airflow moves to one surface of the guide sheet facing the lower part of the guide ring, bends and flows along the oblique lower part under the action of the guide sheet, and then enters the end part of the impeller flow channel at the lower part. Meanwhile, under the action of the coanda effect, a part of air flow flows along one surface of the guide vane back to the lower part of the guide ring, so that the drainage and steering action of the guide vane can be further improved. The guide vanes play a role in pertinence bending and guiding the inlet oil smoke in the lower end area of the air inlet of the fan, weaken the flow separation and vortex motion of oil smoke gas flow in a large bending flow area and reduce the vortex noise. Meanwhile, under the flow guiding effect of the flow guiding sheet, more air flows can move to the lower end part of the impeller flow channel, the axial air inlet uniformity of the impeller flow channel is improved, the working efficiency of the impeller can be improved, and the pneumatic performance and the working noise of the fan are optimized.

The centrifugal fan and the range hood provided by the embodiment of the utility model both comprise the current collector. Because the centrifugal fan and the range hood provided by the embodiment of the utility model use the current collector, the centrifugal fan and the range hood provided by the embodiment of the utility model also have the advantage of the current collector.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic view of a current collector provided by an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at position M;

fig. 3 is a schematic view of an axial center cross-sectional profile of a current collector according to an embodiment of the present invention;

fig. 4 is a schematic view illustrating an installation of a collector and a centrifugal fan according to an embodiment of the present invention;

FIG. 5 is a schematic view of a centrifugal fan provided in accordance with an embodiment of the present invention;

fig. 6 is an exploded view of a range hood according to an embodiment of the present invention;

fig. 7 is a schematic internal cross-sectional structure of a range hood according to an embodiment of the present invention.

Icon: 100-a guide ring; 110-arc wind guide surface; 120-axial wind guide surface; 200-flow deflectors; 300-annular mounting edge; 410-a volute; 420-a centrifugal impeller; 430-a bracket; 440-a vibration dampening pad; 450-a drive shaft; 460-a motor; 510-a centrifugal fan; 520-a check valve; 530-a main case; 540-smoke collecting hood.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 4, the collector provided by the embodiment of the present invention may be used for being installed at an air inlet of a centrifugal fan 510, and the collector includes a guide ring 100, and the guide ring 100 is used for guiding an air flow flowing from bottom to top to move along an axial direction of the collector.

Unlike the prior art, the current collector includes: and the guide vane 200 is connected to the lower part of the guide ring 100. It should be noted that the lower portion of the baffle ring 100 refers to: when the centrifugal fan 510 is installed in the range hood with its air outlet facing upward, the deflector ring 100 can be divided into an upper portion and a lower portion from the middle, and the lower portion is the lower portion of the deflector ring 100. Since the air flow moves from bottom to top, the problem of guiding the air flow toward the lower end of the impeller only occurs at the lower portion of the baffle 100, and when the air flow flows to the upper portion of the baffle 100, the flow direction of the air flow itself flows toward the upper end of the impeller, so that the baffle 200 is not added to the upper portion of the collector.

The flow deflector 200 is positioned at the inner side of the flow guide ring 100, a gap is formed between the flow deflector 200 and the flow guide ring 100 in the radial direction of the flow collector, and the air outlet end of the flow deflector 200 is positioned at the air outlet side of the air outlet end of the flow guide ring 100 along the axial direction of the flow collector; from the direction of the air inlet side of the current collector towards the air outlet side, the guide vanes 200 incline towards the lower end of the current collector. The flow guiding principle of the current collector provided by the embodiment of the utility model is as follows: when the fan is started, the airflow on the air inlet side of the current collector flows to the guide ring 100 from bottom to top, the guide ring 100 guides the flow direction of the airflow to move along the axial direction of the current collector, the airflow moves to the guide vanes 200 along the axial direction, part of the airflow moves to one surface of the guide vanes 200 facing the lower part of the guide ring 100, bends and flows along the oblique lower part under the action of the guide vanes 200, and then enters the end part of the impeller flow channel at the lower part. Meanwhile, under the action of the coanda effect, a part of air flow flows along the surface of the guide vane 200 back to the lower part of the guide ring 100, so that the drainage and steering action of the guide vane 200 can be further improved. The flow deflector 200 plays a role in bending and guiding the inlet oil smoke in the lower end area of the air inlet of the fan, so that the flow separation and vortex motion of the oil smoke flow in a large bending flow area are weakened, and the vortex noise is reduced. Meanwhile, under the flow guiding effect of the flow guiding sheet 200, more air flows can move to the lower end part of the impeller flow channel, the axial air inlet uniformity of the impeller flow channel is improved, the working efficiency of the impeller can be improved, and the pneumatic performance and the working noise of the fan are optimized.

The guide vane 200 extends along the curve of the arc line, the curvature of the guide vane 200 is the same as that of the guide ring 100, so that the guide vane 200 is better matched with the guide ring 100, the distances between the guide vane 200 and each position of the guide ring 100 are the same, and the air flow between the guide vane 200 and each position of the guide ring 100 is more uniform.

The cross section of the baffle 200 may be flat or arc, and the arc is bent back to the lower portion of the baffle ring 100. Compared to the guide vane 200 having a flat plate-shaped cross section, the guide vane 200 having an arc-shaped cross section has less resistance to the air flow and less reduction in the speed of the air flow when guiding the air flow to turn toward the lower end.

The water conservancy diversion circle 100 is the ring form, and water conservancy diversion circle 100 includes towards the convex arc wind-guiding surface 110 of the air inlet side of collector, the border that arc wind-guiding surface 110 is close to the collector axle center is provided with the edge the axial of collector to the air-out side direction extension of collector axial wind-guiding surface 120. The airflow flowing from bottom to top gradually turns to the horizontal direction along the arc-shaped air guide surface 110 and moves backwards along the axial direction under the guidance of the axial air guide surface 120.

The air inlet end of the flow deflector falls on the flow deflector in the radially outward projection; or the projection of the air inlet end of the flow deflector to the outside along the radial direction and the air outlet end of the flow guide ring are positioned at the same position in the axial direction of the current collector; or the projection of the air inlet end of the guide vane along the radial outward direction falls on the air outlet side of the air outlet end of the guide ring.

In an implementation, the radially outward projection of the air inlet end of the baffle 200 falls on the baffle ring 100, that is, in the axial direction of the collector, the air inlet end of the baffle 200 may be located on the air inlet side of the air outlet end of the axial air guiding surface 120. The airflow flowing into the fan along the axial wind guiding surface 120 interacts with the guide vane 200 when not leaving the axial wind guiding surface 120, so that the airflow at the lower end of the guide ring 100 interacts with the guide vane 200 as much as possible, and the airflow is prevented from escaping after leaving the axial wind guiding surface 120 and not interacting with the guide vane 200.

In another possible implementation, the radially outward projection of the air inlet end of the baffle 200 and the air outlet end of the baffle ring 100 are located at the same position in the axial direction of the collector, that is, as shown in fig. 3, points F and E are located at the same axial position; the airflow flowing into the fan along the axial air guiding surface 120 interacts with the guide vane 200 while leaving the axial air guiding surface 120, so that the airflow at the lower end of the guide ring 100 interacts with the guide vane 200 as much as possible, and the airflow is prevented from escaping after leaving the axial air guiding surface 120 and not interacting with the guide vane 200.

In another embodiment, the projection of the air inlet end of the baffle radially outward falls on the air outlet side of the air outlet end of the flow guiding ring, that is, in the axial direction of the collector, and the air inlet end of the baffle 200 may be located on the air outlet side of the air outlet end of the axial air guiding surface 120. The airflow flowing into the fan along the axial wind guiding surface 120 interacts with the guide vane 200 after leaving the axial wind guiding surface 120, so that the airflow at the lower end of the guide ring 100 interacts with the guide vane 200, and the airflow is prevented from escaping from the axial wind guiding surface 120 and not interacting with the guide vane 200.

The current collector further comprises an annular mounting edge 300 positioned outside the guide ring 100, the plane where the annular mounting edge 300 is located is perpendicular to the axial direction of the current collector, the annular mounting edge 300 is connected with the arc-shaped air guide surface 110, and the vertically arranged annular mounting edge 300 can also play a certain role in guiding air flow to move to the arc-shaped air guide surface 110 from bottom to top; the annular mounting edge 300 is provided with mounting holes, and a current collector can be connected with a fan by screws.

Specifically, the section molded line of the guide ring 100 can be composed of a section of circular arc line BCD and a straight line DE, the circular arc line BCD and the straight line DE are tangent to a point D, and the section molded line of the annular mounting edge 300 is a straight line AB. In particular, the direction of the line DE is kept coincident with the impeller axial direction, i.e. the line AB is kept perpendicular to the line DE. The radius of the circular arc line BCD is R1, and the axial distance between the point E and the point B is L1.

The axial center profile line of the guide vane 200 is a segment of circular arc line FGH. The radius of the circular arc line FGH is R2, and the central angle is θ 3. Specifically, the arc line FGH is axially tangent to the impeller at point F, and the axial positions of point F and point E are the same, i.e., EF and DE remain perpendicular to each other, and the radial distance between point F and point E along the impeller is h 1.

The range of the circumferential angle θ 1 between the end side of the flow deflector 200 close to the air outlet of the volute 410 and the vertical direction is as follows: theta 1 is more than or equal to 30 degrees and less than or equal to 60 degrees; the range of the circumferential angle θ 2 between the end side of the flow deflector 200 far away from the air outlet of the volute 410 and the vertical direction is as follows: theta 2 is more than or equal to 45 degrees and less than or equal to 75 degrees.

The present embodiment provides a set of parameter data for a header, wherein:

10mm≤R1≤15mm，1.0≤R2/R1≤1.2；

5mm≤L1≤10mm，2mm≤h1≤5mm

30°≤θ1≤60°，45°≤θ2≤75°；30°≤θ3≤60°。

when the collector is in an operating state, the oil fume flow near the outer wall moves along the trajectory BCDE according to the operating principle of the centrifugal fan 510, and the flow speed is gradually increased. When the oil fume flow reaches the point E, part of the high-speed airflow bends and flows under the action of the guide vane 200 and then enters the end part of the impeller flow channel at the lower part. Meanwhile, under the action of the coanda effect, a part of air flow flows along the outer side of the guide vane 200, so that the drainage and steering effects of the guide vane 200 can be further improved.

The structure of the deflector ring 100 and the annular mounting edge 300 is applied within 360 degrees of the circumferential direction of the air inlet of the fan, and the deflector 200 is applied only within the range of the circumferential angle of the air inlet with a specific design. The flow collector upper guide vane 200 is arranged at the lower part of the guide ring 100, and fully considers the change of the oil smoke inlet direction and speed of the fan air inlet in the circumferential direction. On one hand, in a severely bent flow area at the lower part of the air inlet of the fan, the flow separation and the vortex motion at the position are effectively weakened through the combined flow guide design of the guide ring 100 and the guide vanes 200; on the other hand, the other circumferential positions of the air inlet of the fan are guided by the single guide ring 100, so that the air inlet of the oil fume flow can be better adapted to flowing of the air.

In order to facilitate processing and improve the overall strength, two ends of the guide vane 200 are connected with the guide ring 100 through connecting pins, and the guide vane 200, the connecting pins and the guide ring 100 are processed in an integrally formed processing mode.

The collector may be applied to the double suction type centrifugal impeller 420, and may also be applied to the single suction type centrifugal impeller 420; the collector can be applied to European-style range hoods and can also be applied to side-draft range hoods; in view of the process and cost, the baffle 200 may be installed separately or the entire collector may be manufactured integrally.

As shown in fig. 5, an embodiment of the present invention provides a centrifugal fan 510, where the centrifugal fan 510 includes the above-mentioned collector.

The centrifugal fan 510 further includes: volute 410, centrifugal impeller 420, bracket 430, vibration dampening mat 440, drive shaft 450, and motor 460. The motor 460 drives the centrifugal impeller 420 to rotate the volute 410 through the transmission shaft 450, and the volute 410 is provided with air inlets on two sides and a collector for guiding air flow. The centrifugal impeller 420 is fixedly connected with the scroll 410 by means of brackets 430 arranged at both sides. The vibration damping pad 440 is arranged between the support 430 and the transmission shaft 450, so that vibration noise generated when the impeller rotates can be effectively reduced.

As shown in fig. 6 and 7, an extractor hood according to an embodiment of the present invention includes the centrifugal fan 510.

The range hood further includes a check valve 520, a main cabinet 530 and a smoke collection cover 540. The lower end of the range hood is provided with a fume collecting hood 540 which plays a role in collecting and collecting cooking fume at the lower part. The main case 530 is fixedly connected to the fume collecting cover 540, a hollow cavity is formed inside the main case, and the centrifugal fan 510 is installed inside the hollow cavity. The check valve 520 is installed at the top of the main cabinet 530 to perform a function of feeding the oil smoke sucked and discharged by the centrifugal fan 510 into a flue connected to the rear end.

When the range hood is in a working state, cooking oil smoke moves from bottom to top under the action of the centrifugal fan 510. In the flowing process of cooking oil smoke entering the air inlet at the side of the centrifugal fan 510 through the inner cavity of the main machine box 530, under the drainage action of the flow collector, especially under the drainage turning action of the flow deflector 200 arranged in the area near the lower part of the air inlet of the fan, the flow separation and the vortex motion are weakened, and the vortex noise is reduced. Meanwhile, after the air inlet flow at the end part of the impeller flow channel at the lower part of the fan is increased, the axial air inlet uniformity of the impeller flow channel is improved, the working efficiency of the impeller can be improved, and further the pneumatic performance and the working noise of the fan are optimized.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A header comprising a deflector ring (100), the deflector ring (100) being adapted to direct an air flow flowing from bottom to top to an axial movement along the header, characterized in that the header comprises: the guide vane (200) is connected to the lower part of the guide ring (100); the flow deflector (200) is positioned on the inner side of the flow guide ring (100), and a gap is formed between the flow deflector (200) and the flow guide ring (100) in the radial direction of the current collector; and along the axial direction of the current collector, the air outlet end of the flow deflector (200) is positioned at the air outlet side of the air outlet end of the flow guide ring (100);

the air inlet side of the collector faces the air outlet side, and the flow deflector (200) inclines towards the lower end of the collector.

2. The current collector of claim 1, wherein the flow deflector (200) extends in an arc curve, the curvature of the flow deflector (200) being the same as the curvature of the flow guiding ring (100).

3. The current collector of claim 2, wherein the cross-section of the baffle (200) is arcuate in shape, the arcuate being curved away from the lower portion of the baffle ring (100).

4. The current collector of claim 1, wherein both ends of the baffle (200) are connected with the baffle ring (100) through connecting feet, and the baffle (200), the connecting feet and the baffle ring (100) are integrally formed.

5. The current collector of claim 1, wherein the circumferential angle θ 1 of the end side of the baffle (200) close to the air outlet of the volute (410) to the vertical is in the range of: theta 1 is more than or equal to 30 degrees and less than or equal to 60 degrees; the range of the circumferential angle theta 2 between the end side of the flow deflector (200) far away from the air outlet of the volute (410) and the vertical direction is as follows: theta 2 is more than or equal to 45 degrees and less than or equal to 75 degrees.

6. The current collector of claim 1, wherein the radially outward projection of the air inlet end of the baffle (200) falls on the deflector collar (100);

or the projection of the air inlet end of the guide vane (200) towards the outside along the radial direction and the air outlet end of the guide ring (100) are positioned at the same position in the axial direction of the current collector;

or the projection of the air inlet end of the guide vane (200) towards the outer side along the radial direction is located on the air outlet side of the air outlet end of the guide ring (100).

7. The collector as claimed in any one of claims 1 to 6, wherein the deflector ring (100) comprises an arc-shaped air deflecting surface (110) protruding towards the air inlet side of the collector, and the edge of the arc-shaped air deflecting surface (110) close to the axis of the collector is provided with an axial air deflecting surface (120) extending along the axial direction of the collector towards the air outlet side of the collector.

8. The collector of claim 7, further comprising an annular mounting edge (300) located outside the deflector ring (100), wherein the plane of the annular mounting edge (300) is perpendicular to the axial direction of the collector, and the annular mounting edge (300) is connected with the arc-shaped air guide surface (110); the annular mounting edge (300) is provided with a mounting hole.

9. A centrifugal fan, characterized in that the centrifugal fan (510) comprises a collector according to any one of claims 1-8.

10. A range hood, characterized in that it comprises a centrifugal fan (510) according to claim 9.