KR20220077569A - Centrifugal fan - Google Patents

Abstract

A centrifugal fan is provided. More particularly, it relates to a centrifugal fan that blows air cooled by an evaporator. A centrifugal fan according to an aspect of the present specification includes a hub coupled to a rotational shaft, and a plurality of blades disposed on the hub and radially disposed about the rotational shaft, wherein the blades include a straight part and the straight part Including a curved portion extending in a radial direction and a folding portion extending in a circumferential direction from an upper end or lower end of the curved portion, the width of the folding portion is formed to be uniform as a whole. Through this, the cooling efficiency of the centrifugal fan can be improved by preventing the refrigerant from leaking into the space between the plurality of blades. In addition, since the folding part can be formed by bending the upper end or the lower end of the curved part, it is possible to reduce the manufacturing cost of the part.

Description

Centrifugal Fan {CENTRIFUGAL FAN}

This specification relates to centrifugal fans. More particularly, it relates to a centrifugal fan that blows air cooled by an evaporator.

In general, a refrigerator can cool food or prevent spoilage by providing cool air using a refrigeration cycle device including a compressor, a condenser, an expansion mechanism, and an evaporator. A refrigerator is a device that uses cold air to keep food fresh for a long period of time.

In the refrigerator, a centrifugal fan is installed on the flow path to flow air from the refrigerating compartment and the freezing compartment to the evaporator and then blowing the air into the refrigerating compartment and the freezing compartment.

A refrigerator generally has an outer case with an open front, an inner case disposed inside the outer case, a storage compartment (eg, a refrigerator or freezer compartment) disposed inside the inner case, and a front side of the outer case to open and close the storage compartment including a door that

In this case, the refrigerator includes an evaporator formed on one side of the storage chamber and generating cold air by exchanging refrigerant with air, a cold air flow path disposed between the outer case and the inner case, and a centrifugal system for circulating cold air of the evaporator to the storage chamber through the cold air flow passage It may include a fan and a motor for providing power to the centrifugal fan.

Korean Patent Publication No. 10-0389395 B (2003.06.27. Announcement) Korean Patent Publication No. 10-1577875 B (2015.12.28. Announcement)

An object of the present specification is to provide a centrifugal fan capable of improving blowing efficiency by preventing a refrigerant from leaking into a space between a plurality of blades.

In addition, the problem to be solved by the present specification is to provide a centrifugal fan capable of reducing the manufacturing cost of parts.

A centrifugal fan according to an aspect of the present specification for achieving the above object includes a hub coupled to a rotational shaft, and a plurality of blades disposed on the hub and radially disposed about the rotational shaft, the blades comprising: It may include a straight part, a curved part extending in a radial direction from the straight part, and a folding part extending in a circumferential direction from an upper end or a lower end of the curved part, and the width of the folding part may be formed to be uniform as a whole.

Through this, the cooling efficiency of the centrifugal fan can be improved by preventing the refrigerant from leaking into the space between the plurality of blades.

In addition, since the folding part can be formed by bending the upper end or the lower end of the curved part, it is possible to reduce the manufacturing cost of the part.

_, (여기에서, w는 상기 폴딩부의 폭, a는 상기 블레이드의 피치각, D_o는 상기 블레이드의 외경)을 만족할 수 있다.In addition, the width of the folding part is the following formula,

_, (where w is the width of the folding part, a is the pitch angle of the _blade , and Do is the outer diameter of the blade).

In addition, the folding part may be disposed only at one of the upper end and the lower end of the curved part.

In addition, the folding part may extend from the upper end or the lower end of the curved part in a direction opposite to the rotation direction of the rotation shaft.

In addition, the folding part may extend in the circumferential direction from the entire area of the upper end of the curved portion or the entire area of the lower end of the curved portion.

In addition, an angle between the relative velocity vector of the fluid particle and the circumferential direction vector at the inner end of the straight part may be 40 degrees or more and 45 degrees or less.

In addition, the angle between the relative velocity vector of the fluid particle and the circumferential direction vector at the outer end of the curved portion may be 115 degrees or more and 120 degrees or less.

Also, the curved portion may be concave in a rotation direction of the rotation shaft.

A centrifugal fan according to an aspect of the present specification for achieving the above object includes a hub coupled to a rotation shaft, and a plurality of blades disposed on the hub and radially disposed about the rotation shaft, the plurality of The blade includes a first blade, a second blade disposed on one side of the first blade, and a third blade disposed on one side of the second blade, wherein the first blade includes a first straight portion and the second blade 1 includes a first curved portion extending in a radial direction from the straight portion, wherein the second blade includes a second straight portion, a second curved portion extending radially from the second straight portion, and an upper end of the first curved portion and a first folding part connecting an upper end of the second curved part, and the third blade having a third straight part, a third curved part extending in a radial direction from the third straight part, and the second curved part It may include a second folding part connecting the lower end and the lower end of the third curved part.

Through this, the cooling efficiency of the centrifugal fan can be improved by preventing the refrigerant from leaking into the space between the plurality of blades.

In addition, the number of the plurality of blades may be 55 or more and 60 or less.

In addition, the first folding part may connect the entire upper end of the first curved part and the entire upper end of the second curved part, and the second folding part may connect the entire lower end of the second curved part and the entire lower end of the third curved part. .

In addition, an angle between the relative velocity vector of the fluid particle and the circumferential vector at the inner ends of the first to third straight lines may be 40 degrees or more and 45 degrees or less.

In addition, an angle between the relative velocity vector of the fluid particle and the circumferential direction vector at the outer ends of the first to third curved portions may be 115 degrees or more and 120 degrees or less.

Also, the first to third curved portions may be concave in a rotation direction of the rotation shaft.

Through the present specification, it is possible to provide a centrifugal fan capable of improving the blowing efficiency by preventing the refrigerant from leaking into the space between the plurality of blades.

In addition, through the present specification, it is possible to provide a centrifugal fan capable of reducing the manufacturing cost of parts.

1 is a perspective view of a centrifugal fan according to a first embodiment of the present specification.
2 is a plan view of a centrifugal fan according to a first embodiment of the present specification.
3 is a schematic diagram of a centrifugal fan according to a first embodiment of the present specification;
4 is a perspective view of a centrifugal fan according to a second embodiment of the present specification.
5 is a perspective view of a blade of a centrifugal fan according to a second embodiment of the present specification.
6 is a perspective view of a centrifugal fan according to a third embodiment of the present specification.
7 is a graph showing the blowing efficiency of the centrifugal fan according to the second and third embodiments of the present specification.
8 is a perspective view of a centrifugal fan according to a fourth embodiment of the present specification.
9 is a perspective view of a blade of a centrifugal fan according to a fourth embodiment of the present specification.
10 is a diagram illustrating a flow of a refrigerant in the centrifugal fan according to the first embodiment of the present specification.
11 is a view showing the flow of refrigerant in the centrifugal fan according to the second to fourth embodiments of the present specification.
12 is a graph showing the efficiency of centrifugal fans according to second to fourth embodiments of the present specification.
13 is a perspective view of a centrifugal fan according to a fifth embodiment of the present specification.
14 is a perspective view of a partial configuration of a centrifugal fan according to a fifth embodiment of the present specification.
15 is a graph showing the efficiency of a centrifugal fan according to a fifth embodiment of the present specification.

Hereinafter, the embodiments disclosed in the present specification (discloser) will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numbers regardless of reference numerals, and redundant description thereof will be omitted.

In the description of the embodiments disclosed in this specification, when a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but It should be understood that other components may exist in between.

In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed in this specification is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present specification , should be understood to include equivalents or substitutes.

On the other hand, the terms of the specification (discloser) can be replaced with terms such as document, specification, description.

1 is a perspective view of a centrifugal fan according to a first embodiment of the present specification. 2 is a plan view of a centrifugal fan according to a first embodiment of the present specification. 3 is a schematic diagram of a centrifugal fan according to a first embodiment of the present specification;

1 to 3 , the centrifugal fan 10 according to the first embodiment of the present specification may include a rotating shaft 100 , a hub 200 , and a plurality of blades 300 , but among them It may be implemented except for some configurations, and additional configurations are not excluded.

The centrifugal fan 10 is disposed between the outer case and the inner case of the refrigerator, and may flow the refrigerant cooled in the evaporator into the storage chamber.

The rotation shaft 100 may be rotatably disposed in one direction. For example, the rotation shaft 100 may be rotatably connected to a motor (not shown). A hub 200 may be rotatably coupled to the rotation shaft 100 .

The hub 200 may be rotatably connected to the rotation shaft 100 . A blade 300 may be disposed on the hub 200 . In the embodiments of the present specification, the hub 200 has a cylindrical shape as an example, but if the blade 300 can be rotated in one direction according to the rotation of the rotation shaft 100, the shape of the hub 200 may be varied. can be changed.

The plurality of blades 300 may be disposed on the hub 200 . The plurality of blades 300 may be radially disposed with respect to the rotation shaft 100 . The inner diameter (D _i ) of the plurality of blades 300 may mean a diameter of a virtual circle drawn by the inner ends of the plurality of blades 300 . The outer diameter D _o of the plurality of blades 300 may mean a diameter of a virtual circle drawn by the outer ends of the plurality of blades 300 . In the first embodiment of the present specification, the inner diameter (D _i ) of the plurality of blades 300 may be 40 mm, and the outer diameter (D _o ) of the plurality of blades 300 may be 85 mm. Through this, the compact centrifugal fan 10 can be formed.

The blade 300 may include a straight part 310 , a connection part 320 , and a curved part 330 .

The straight part 310 may be formed in a straight shape when the centrifugal fan 10 is viewed from above. The straight part 310 may be formed in a radial shape. In the first embodiment of the present specification, the inner end of the straight part 310 is connected to the hub 200 as an example, but it is not excluded that the inner end of the straight part 310 is not connected to the hub 200. does not

A straight line connecting the straight line part 310 may not pass through the rotation shaft 100 . Specifically, the angle a1 between the relative velocity vector L2 of the fluid particle and the circumferential vector L1 at the inner end of the straight line part 310 may be 40 degrees or more and 45 degrees or less. The relative velocity vector L2 of the fluid particle at the inner end of the straight part 310 is the absolute velocity vector of the fluid particle at the inner end of the straight part 310, and the circumferential vector L1 at the inner end of the straight part 310. may mean subtracting The circumferential vector L1 at the inner end of the straight line portion 310 may mean a tangent vector at a point where the blade 300 contacts the virtual circle formed by the inner end of the plurality of blades 300 . Through this, the inner diameter (D _i ) of the plurality of blades 300 is 40mm, and the outer diameter (Do ) of the plurality of blades 300 is _85mm , when the number of the plurality of blades 300 is increased to the maximum and centrifugal It is possible to improve the blowing efficiency of the fan 10 .

The connection part 320 may connect the straight part 310 and the curved part 330 . The connection part 320 may be formed in a straight shape when the centrifugal fan 10 is viewed from above. When the centrifugal fan 10 is viewed from the side, the connection part 320 may increase in height as at least a part of it goes outward.

The curved part 330 may be formed in a curved shape when the centrifugal fan 10 is viewed from above. The curved part 330 may be formed to be concave in the rotation direction of the rotation shaft 100 as a whole. The curved part 330 may be formed in a sirocco shape as a whole. Through this, it is possible to reduce the noise of the centrifugal fan 10 by reducing the number of rotations even at the same flow rate.

An angle a2 between the relative velocity vector L4 of the fluid particle and the circumferential vector L3 at the outer end of the curved part 330 may be 115 degrees or more and 120 degrees or less. The relative velocity vector L4 of the fluid particle at the outer end of the curved portion 330 is the absolute velocity vector of the fluid particle at the outer end of the curved portion 330, and the circumferential vector L3 at the outer end of the curved portion 330. may mean subtracting At the outer end of the curved portion 330 , the circumferential vector L3 may mean a tangent vector at a point where the blade 300 contacts the virtual circle formed by the outer end of the plurality of blades 300 . Through this, the inner diameter (D _i ) of the plurality of blades 300 is 40mm, and the outer diameter (Do ) of the plurality of blades 300 is _85mm , when the number of the plurality of blades 300 is increased to the maximum and centrifugal It is possible to improve the blowing efficiency of the fan 10 .

The height of the curved part 330 may be higher than the height of the straight part 310 . In the first embodiment of the present specification, the height of the curved part 330 may mean the axial height of the rotation shaft 100 , and the height of the straight part 310 may mean the axial height of the rotation shaft 100 .

According to the centrifugal fan 10 according to the first embodiment of the present specification, since the blade 300 is formed of a straight part 310 and a curved part 330 , it is possible to reduce noise while maintaining the blowing efficiency. In addition, the number of the plurality of blades 300 may be 60. Through this, even with the configuration of the compact centrifugal fan 10, the blowing efficiency can be improved.

4 is a perspective view of a centrifugal fan according to a second embodiment of the present specification. 5 is a perspective view of a blade of a centrifugal fan according to a second embodiment of the present specification. 6 is a perspective view of a centrifugal fan according to a third embodiment of the present specification. 7 is a graph showing the blowing efficiency of the centrifugal fan according to the second and third embodiments of the present specification. 8 is a perspective view of a centrifugal fan according to a fourth embodiment of the present specification. 9 is a perspective view of a blade of a centrifugal fan according to a fourth embodiment of the present specification. 10 is a view showing a flow of a refrigerant in the centrifugal fan according to the first embodiment of the present specification. 11 is a view showing the flow of refrigerant in the centrifugal fan according to the second to fourth embodiments of the present specification. 12 is a graph showing the efficiency of centrifugal fans according to second to fourth embodiments of the present specification.

4 and 5 , the centrifugal fan 20 according to the second embodiment of the present specification may include a rotating shaft 100 , a hub 200 , and a plurality of blades 300 , but among these It may be implemented except for some configurations, and additional configurations are not excluded.

A configuration not described below may be understood to be the same as a detailed configuration of the centrifugal fan 10 according to the first embodiment of the present specification.

The blade 300 may include a folding part 340 . The folding part 340 may extend in the circumferential direction from the upper end of the curved part 330 . Specifically, the folding part 340 may extend from the upper end of the curved part 330 in a direction opposite to the rotation direction of the rotation shaft 100 (backward). The folding part 340 is not formed at the lower end of the curved part 330 , but may extend in a direction opposite to the rotation direction of the rotation shaft 100 only at the upper end of the curved part 330 . The folding part 340 may extend in a direction opposite to the rotation direction of the rotation shaft 100 in the entire area of the upper end of the curved part 330 .

Referring to FIG. 6 , the folding part 350 of the blade 300 of the centrifugal fan 30 according to the third embodiment of the present specification moves from the upper end of the curved part 330 to the direction of the rotation shaft 100 (forward). can be extended

Referring to FIG. 7 , in the case of the folding part 340 of the centrifugal fan 20 according to the second embodiment of the present specification compared to the folding part 350 of the centrifugal fan 30 according to the third embodiment of the present specification. This means that the blowing efficiency is further improved. That is, as in the case of the centrifugal fan 20 according to the second embodiment of the present specification, the folding part 340 preferably extends in a direction opposite to the rotation direction of the rotation shaft 100 in the curved part 300 .

Referring to FIGS. 8 and 9 , the folding part 360 of the blade 300 of the centrifugal fan 40 according to the fourth embodiment of the present specification may refer to the circumferential direction from the lower end of the curved part 330 . . In FIGS. 8 and 9 , the folding part 360 has been described as extending in the direction opposite to the rotation direction of the rotation shaft 100 in the lower region of the curved part 330 , but it is extended in the rotation direction of the rotation shaft 100 . does not exclude

Referring to FIG. 10 , in the case of the centrifugal fan 10 according to the first embodiment of the present specification, it can be seen that the refrigerant leaks between the plurality of blades 300 . Referring to FIG. 11 , in the case of the centrifugal fans 20 , 30 , and 40 according to the second to fourth embodiments of the present specification, it can be seen that the amount of refrigerant leaked between the plurality of blades 300 is reduced.

That is, through the centrifugal fans 20, 30, and 40 according to the second to fourth embodiments of the present specification, it is possible to prevent the refrigerant from leaking into the space between the plurality of blades 300, thereby reducing the blowing efficiency. have. In addition, since the folding parts 340 , 350 , and 360 are formed only at one of the upper or lower ends of the curved part 330 , it is possible to prevent an increase in cost due to an increase in unnecessary parts. In addition, since the folding part 340 extends in the circumferential direction perpendicular to the upper end or lower end of the curved part 330 extending in the radial direction, the folding part 340 is formed by bending the upper end or the lower end of the curved part 330 . can do. Through this, it is possible to reduce the manufacturing cost of the part.

The width w of the folding parts 340 , 350 , and 360 of the blade 300 may be formed uniformly as a whole. The width w of the folding parts 340 , 350 , and 360 may mean the circumferential length of the folding parts 340 , 350 , and 360 . The width w of the folding parts 340 , 350 , and 360 may satisfy Equation 1 below.

[Equation 1]

Here, w denotes the width of the folding parts 340 , 350 , 360 , a denotes a pitch angle of the blade 300 , and D _o denotes the outer diameter of the blade 300 . have. The pitch angle a of the blades 300 may mean 360/n, and n may mean the number of the plurality of blades 300 .

12, the inner diameter (D _i ) of the plurality of blades 300 is 40mm, the outer diameter (Do ) of the plurality of blades 300 is _85mm , and the number of the plurality of blades 300 is 60. , w can be seen to be between about 1.48 to 1.98, and in that case, it can be seen that the blowing efficiency of the centrifugal fans 20, 30, 40 is increased than before. Accordingly, when the overall constant width w of the folding parts 340 , 350 , 360 of the blade 300 satisfies Equation 1, the blowing efficiency of the centrifugal fans 20 , 30 , 40 can be improved .

13 is a perspective view of a centrifugal fan according to a fifth embodiment of the present specification. 14 is a perspective view of a partial configuration of a centrifugal fan according to a fifth embodiment of the present specification. 15 is a graph showing the efficiency of a centrifugal fan according to a fifth embodiment of the present specification.

13 and 14 , the centrifugal fan 50 according to the fifth embodiment of the present specification may include a rotation shaft 100 , a hub 200 , and a plurality of blades 300 , but among these It may be implemented except for some configurations, and additional configurations are not excluded.

A configuration not described below may be understood to be the same as a detailed configuration of the centrifugal fan 10 according to the first embodiment of the present specification.

The plurality of blades 300 may include a first blade, a second blade disposed on one side of the first blade, and a third blade disposed on one side of the second blade.

The first blade has a first straight part 312 , a first curved part 332 extending in a radial direction from the first straight part 312 , and a first straight part 312 and a first curved part 332 . It may include a first connection part 322 for connecting the.

The second blade includes a second straight part 314 , a second curved part 334 extending in a radial direction from the second straight part 314 , and a second straight part 314 and a second curved part 334 . It may include a second connection part 324 for connecting the , and a first folding part 380 for connecting the upper end of the first curved part 332 and the upper end of the second curved part 334 . The first folding part 380 may connect the entire area of the upper end of the first curved part 332 and the entire area of the upper end of the second curved part 334 .

The third blade has a third straight part 316 , a third curved part 336 extending in a radial direction from the third straight part 316 , and a third straight part 316 and a third curved part 336 . It may include a third connecting portion 326 connecting the , and a second folding portion 390 connecting the lower end of the second curved portion 334 and the lower end of the third curved portion 336 . The second folding part 390 may connect the entire area of the lower end of the second curved part 334 and the entire area of the lower end of the third curved part 336 .

That is, in the plurality of blades 300 , upper ends and lower ends of adjacent curved portions 330 may be alternately connected by folding portions 380 and 390 . Through this, it is possible to increase the efficiency of the centrifugal fan 50 by reducing the refrigerant leaking between the plurality of blades 300 .

15, when the inner diameter (D _i ) of the plurality of blades 300 is 40mm, and the outer diameter (Do ) of the plurality of blades 300 is _85mm , the number of the plurality of blades 300 is 55 In the above case, it can be seen that the efficiency is higher than before. In addition, when the number of the plurality of blades 300 exceeds 60, interference of neighboring blades among the plurality of blades 300 may occur. That is, the number of the plurality of blades 300 is preferably 55 or more and 60 or less.

Any or other embodiments of the present specification described above are not mutually exclusive or distinct. Any of the above-described embodiments or other embodiments of the present specification may be combined or combined with each configuration or function.

For example, it means that configuration A described in a specific embodiment and/or drawings may be combined with configuration B described in other embodiments and/or drawings. That is, even if the coupling between the components is not directly described, it means that the coupling is possible except for the case where it is described that the coupling is impossible.

The above detailed description should not be construed as restrictive in all respects and should be considered as exemplary. The scope of this specification should be determined by a reasonable interpretation of the appended claims, and all modifications within the scope of equivalents of this specification are included in the scope of this specification.

10, 20, 30, 40, 50: centrifugal fan 100: rotating shaft
200: hub 300: blade

Claims (14)

a hub coupled to the rotating shaft; and
and a plurality of blades disposed on the hub and radially disposed about the axis of rotation,
The blade includes a straight part, a curved part extending in a radial direction from the straight part, and a folding part extending in a circumferential direction from an upper end or a lower end of the curved part,
A centrifugal fan in which the width of the folding part is formed uniformly as a whole. The method of claim 1,
The width of the folding part is expressed by the following formula,

_,
(where w is the width of the folding part, a is the pitch angle of the blade, and D _o is the outer diameter of the blade). The method of claim 1,
A centrifugal fan in which the folding part is disposed only at one of the upper end and the lower end of the curved part. The method of claim 1,
The folding part is a centrifugal fan extending from the upper end or the lower end of the curved part in a direction opposite to the rotation direction of the rotation shaft. The method of claim 1,
The folding part is a centrifugal fan extending in the circumferential direction in the entire area of the upper end or the lower end of the curved portion. The method of claim 1,
An angle between the relative velocity vector of the fluid particle and the circumferential direction vector at the inner end of the straight part is 40 degrees or more and 45 degrees or less. The method of claim 1,
An angle between the relative velocity vector of the fluid particle and the circumferential direction vector at the outer end of the curved part is 115 degrees or more and 120 degrees or less. The method of claim 1,
A centrifugal fan in which the curved portion is concave in a rotation direction of the rotation shaft. a hub coupled to the rotating shaft; and
and a plurality of blades disposed on the hub and radially disposed about the axis of rotation,
The plurality of blades includes a first blade, a second blade disposed on one side of the first blade, and a third blade disposed on one side of the second blade,
The first blade includes a first straight portion and a first curved portion extending in a radial direction from the first straight portion,
The second blade includes a second straight part, a second curved part extending in a radial direction from the second straight part, and a first folding part connecting an upper end of the first curved part and an upper end of the second curved part, ,
The third blade includes a third straight part, a third curved part extending in a radial direction from the third straight part, and a second folding part connecting a lower end of the second curved part and a lower end of the third curved part centrifugal fan. 10. The method of claim 9,
The number of the plurality of blades is 55 or more and 60 or less centrifugal fan. 10. The method of claim 9,
The first folding portion connects the entire upper end of the first curved portion and the entire upper end of the second curved portion,
The second folding part is a centrifugal fan connecting the entire lower end of the second curved part and the entire lower end of the third curved part. 10. The method of claim 9,
An angle between the relative velocity vector of the fluid particle and the circumferential vector at the inner end of the first to third straight lines is 40 degrees or more and 45 degrees or less. 10. The method of claim 9,
An angle between the relative velocity vector of the fluid particle and the circumferential direction vector at the outer end of the first to third curved portions is 115 degrees or more and 120 degrees or less. 10. The method of claim 9,
The first to third curved portions are concavely formed in a rotation direction of the rotation shaft.

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