CN110056514B - Centrifugal fan and cooling device comprising same - Google Patents

Centrifugal fan and cooling device comprising same Download PDF

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Publication number
CN110056514B
CN110056514B CN201810052742.7A CN201810052742A CN110056514B CN 110056514 B CN110056514 B CN 110056514B CN 201810052742 A CN201810052742 A CN 201810052742A CN 110056514 B CN110056514 B CN 110056514B
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China
Prior art keywords
plate portion
centrifugal fan
impeller
plate
rib
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CN201810052742.7A
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CN110056514A (en
Inventor
雷鹏
佟国梁
薛邦全
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Nidec Corp
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Nidec Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F04D29/424—Double entry casings

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A centrifugal fan and a cooling apparatus including the same, the centrifugal fan having: an impeller, a motor; and a housing; the housing has: a first plate portion having a first air intake port that penetrates in an axial direction; a second plate section having a second air inlet penetrating in the axial direction; a first side wall portion extending from a radially outer edge of the first plate portion in a direction toward the second plate portion; and a second side wall portion extending from a radially outer edge of the second plate portion toward the first plate portion; the impeller has: a cup portion; a first support portion located radially outside the cup portion, the first support portion having a plurality of blades arranged in an axial direction; and a first rib connecting the cup portion and the first support portion; the portion enclosed by the cup portion, the first supporting portion and the first rib portion forms an impeller opening, and the area of the impeller opening is larger than that of the second air suction port. Since the opening area on the impeller side becomes large, the loss of the amount of air flowing from the intake port is reduced, and the amount of air blown is increased.

Description

Centrifugal fan and cooling device comprising same
Technical Field
The present invention relates to a motor, and more particularly, to a centrifugal fan and a cooling device including the same.
Background
With the development of society and the advancement of science and technology, people now pursue high-quality life, and the requirements on household appliances are higher and higher. The efficiency and cost of household appliances are considerations when people choose to purchase them.
It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the invention.
Disclosure of Invention
In order to increase the air intake of the centrifugal fan and control the cost, the embodiment of the invention provides the centrifugal fan and a cooling device comprising the centrifugal fan.
According to a first aspect of embodiments of the present invention, there is provided a centrifugal fan having:
an impeller is arranged on the upper portion of the shell,
a motor having a rotating portion that is disposed so as to be rotatable about a central axis and that drives the impeller to rotate; and
a housing that houses the impeller and the motor therein;
the housing has:
a first plate portion located on one axial side of the impeller and having a first intake port that penetrates in the axial direction;
a second plate portion that is located on the other axial side of the impeller and has a second air inlet that penetrates in the axial direction;
a first side wall portion extending from an edge of a radial outer side of the first plate portion toward the second plate portion; and
a second side wall portion extending from an edge of a radially outer side of the second plate portion toward the first plate portion;
the impeller has:
a cup portion that houses the rotating portion of the motor;
a first support portion located radially outside the cup portion, the first support portion having a plurality of blades arranged in an axial direction; and
a first rib connecting the cup portion and the first support portion;
wherein a portion surrounded by the cup portion, the first support portion, and the first rib portion constitutes an impeller opening;
the area of the opening of the impeller is larger than that of the second air suction port.
In one embodiment, the second plate portion has: a second support part supporting the motor; a rim located radially outward of the second support portion; and a second rib portion connecting the second support portion and the rim portion in a radial direction; wherein a portion surrounded by the second support portion, the edge portion, and the second rib portion constitutes the second air inlet.
In one embodiment, the cup portion is formed in a cylindrical shape extending in the axial direction, and an edge of the outermost side in the radial direction of the cylindrical cup portion, which is closer to the second plate portion, is closer to the first plate portion than an edge of the inner side in the radial direction of the first support portion, so that the first rib portion is provided obliquely.
In one embodiment, the first support portion is expanded in a flat plate shape in a radial direction, the plurality of blades are arranged on a surface of the first support portion on a side close to the first plate portion, and a projection of the first support portion on a plane perpendicular to the central axis partially overlaps a projection of the edge portion of the second plate portion on the plane as viewed in an axial direction.
In one embodiment, one end of the first support portion on the radially inner side is closer to the radially inner side than one end of the second plate portion on the radially inner side of the rim portion.
In one embodiment, the first ribs are arranged at equally spaced angles in the circumferential direction; the second ribs are arranged at a different angle in the circumferential direction from the first ribs.
In one embodiment, the number of the first ribs is the same as the number of the second ribs, and the number of the first ribs and the number of the second ribs are three.
In one embodiment, the circumferential extent of the second ribs is greater than the circumferential extent of the first ribs.
In one embodiment, a circuit board is disposed between the second support portion and the motor.
In one embodiment, the number of the first ribs is four or five.
In one embodiment, a third rib portion is provided on a surface of the second plate portion on a side close to the first plate portion, the third rib portion being provided radially outward of the first support portion.
In one embodiment, a ratio of an axial height between a face of the first plate portion remote from the second plate portion to a face of the second plate portion remote from the first plate portion to an axial height between a face of the second plate portion remote from the first plate portion to an end of the motor close to the first plate portion is in a range of 0.5 to 0.8.
In one embodiment, the ratio of the area of the impeller opening to the area of the first suction port is in the range of 0.25 to 0.55.
According to a second aspect of the embodiments of the present invention, there is provided a cooling device, which includes the centrifugal fan.
The embodiment of the invention has the beneficial effects that: with the centrifugal fan of the embodiment of the invention, the opening area of the impeller side is increased, the loss of the air quantity flowing in from the air suction port is reduced, and the air supply quantity is increased.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the scope of the terms of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
Elements and features described in one drawing or one implementation of an embodiment of the invention may be combined with elements and features shown in one or more other drawings or implementations. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views, and may be used to designate corresponding parts for use in more than one embodiment.
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In the drawings:
fig. 1 is a schematic view of a centrifugal fan of embodiment 1;
fig. 2 is an exploded view of the centrifugal fan of embodiment 1;
fig. 3 is a sectional view of the centrifugal fan of embodiment 1;
fig. 4 is a schematic view of the first plate portion, the first air intake port, and the first side wall portion of the centrifugal fan of embodiment 1;
fig. 5 is a plan view of the first plate portion and the first air intake port of the centrifugal fan according to embodiment 1;
fig. 6 is a schematic view of a second plate portion, a second suction port, and a second side wall portion of the centrifugal fan of embodiment 1;
fig. 7 is a plan view of a second plate portion and a second air inlet of the centrifugal fan according to embodiment 1;
fig. 8 is a schematic view of an impeller of the centrifugal fan of embodiment 1;
fig. 9 is a plan view of an impeller of the centrifugal fan according to embodiment 1.
Detailed Description
The foregoing and other features of the invention will become apparent from the following description taken in conjunction with the accompanying drawings. In the description and drawings, particular embodiments of the invention have been disclosed in detail as being indicative of some of the embodiments in which the principles of the invention may be employed, it being understood that the invention is not limited to the embodiments described, but, on the contrary, is intended to cover all modifications, variations, and equivalents falling within the scope of the appended claims.
In the embodiments of the present invention, the terms "first", "second", and the like are used for distinguishing different elements by name, but do not denote a spatial arrangement, a temporal order, or the like of the elements, and the elements should not be limited by the terms. The term "and/or" includes any and all combinations of one or more of the associated listed terms. The terms "comprising," "including," "having," and the like, refer to the presence of stated features, elements, components, and do not preclude the presence or addition of one or more other features, elements, components, and elements.
In embodiments of the invention, the singular forms "a", "an", and the like include the plural forms and are to be construed broadly as "a" or "an" and not limited to the meaning of "a" or "an"; furthermore, the term "comprising" should be understood to include both the singular and the plural, unless the context clearly dictates otherwise. Further, the term "according to" should be understood as "at least partially according to … …," and the term "based on" should be understood as "based at least partially on … …," unless the context clearly dictates otherwise.
In the embodiment of the present invention, for the convenience of description, a direction parallel to a direction extending along the central axis is referred to as an "axial direction", a radial direction centering on the central axis is referred to as a "radial direction", and a direction around the central axis is referred to as a "circumferential direction", but this is merely for the convenience of description, and does not limit the orientation of the centrifugal fan in the embodiment of the present invention at the time of use and manufacture.
Various embodiments of the present invention will be described below with reference to the accompanying drawings. These embodiments are merely exemplary and are not intended to limit the present invention.
Example 1
The embodiment of the invention provides a centrifugal fan. Fig. 1 is a schematic view of the centrifugal fan, fig. 2 is an exploded view of the centrifugal fan, and fig. 3 is a sectional view of the centrifugal fan. As shown in fig. 1 to 3, the centrifugal fan has an impeller 100, a motor 200, and a casing 300. The motor 200 includes a rotating portion 201, and the rotating portion 201 is disposed to be rotatable about a central axis and drives the impeller 100 to rotate. The casing 300 internally houses the impeller 100 and the motor 200.
In the present embodiment, as shown in fig. 2, the housing 300 has a first plate portion (also referred to as an upper plate portion) 301 and a second plate portion (also referred to as a lower plate portion) 302. The first plate 301 is located on one axial side of the impeller 100, has a first intake port (also referred to as an upper intake port) 303 that penetrates in the axial direction, and has a first side wall 305 extending from at least a part of the radially outer edge of the first plate 301 in the direction of the second plate 302. Fig. 4 and 5 show the structure of an embodiment of the first plate portion 301, the first air intake port 303, and the first side wall portion 305. The second plate portion 302 is located on the other axial side of the impeller 100, and has a second air inlet (also referred to as a lower air inlet) 304 that penetrates in the axial direction, and a second side wall portion 306 that extends from at least a part of the outer edge of the second plate portion 302 in the radial direction toward the first plate portion 301. Fig. 6 and 7 show the structure of one embodiment of the second plate portion 302.
In the present embodiment, as shown in fig. 1, the first side wall 305 and the second side wall 306 may be engaged, fitted or connected in other ways in the axial direction, which is not limited in the present embodiment.
In the present embodiment, as shown in fig. 2 and 3, the impeller 100 has a cup portion (also referred to as an impeller cup portion) 101, a first support portion (also referred to as an impeller support portion) 102, and a first rib portion (also referred to as an impeller rib) 103. Fig. 8 and 9 show a configuration of an embodiment of the impeller 100, and as shown in fig. 3 and 8, the cup portion 101 houses the rotating portion 201 of the motor, the first support portion 102 is located radially outward of the cup portion 101, a plurality of blades 104 are provided in the first support portion 102 in the axial direction, the first rib 103 connects the cup portion 101 and the first support portion 102, and a portion surrounded by the cup portion 101, the first support portion 102, and the first rib 103 constitutes the impeller opening 105.
In the present embodiment, the area of the impeller opening 105 (shown in fig. 9) is larger than the area of the second air inlet 304 (shown in fig. 7), that is, the sum of the opening areas on the impeller side is larger than the sum of the opening areas on the lower plate side, whereby the loss of the amount of air flowing from the air inlet is reduced by enlarging the opening area on the impeller side, and the amount of air blown by the centrifugal fan can be increased.
In one embodiment of the present embodiment, as shown in fig. 7, the second plate portion 302 has a second support portion (also referred to as a motor support portion) 3021 that supports the above-described motor 200; a rim section 3022 located radially outward of the second support section 3021; and a second rib (also referred to as a lower plate rib) 3023 connecting the second support portion 3021 and the edge portion 3022 in the radial direction. In the present embodiment, as shown in fig. 7, a portion surrounded by the second support portion 3021, the edge portion 3022, and the second rib portion 3023 constitutes the second air inlet 304.
In one embodiment of the present embodiment, as shown in fig. 2 and 8, the cup portion 101 may be formed in a cylindrical shape extending in the axial direction, and as shown in fig. 3, an edge of the radially outermost side of the cylindrical cup portion 101, which is close to the second plate portion 302, is closer to the first plate portion 301 than an edge of the radially inner side of the first support portion 102, that is, a lower end a of the cup portion 101 is closer to an upper side shown in fig. 3 than an inner end B of the first support portion 102, as viewed in fig. 3. Since the first rib 103 is used to connect the cup portion 101 and the first support portion 102, by such an arrangement, the first rib 103 can be formed to be obliquely arranged. The opening area of the impeller opening 105 can be further increased, and the loss of the amount of air flowing from the intake port can be reduced, thereby increasing the amount of air blown.
In one embodiment of the present embodiment, as shown in fig. 3, the first support section 102 is expanded in a flat plate shape in the radial direction, the plurality of blades 104 are arranged on the surface of the first support section 102 on the side close to the first plate section (upper plate section) 301, and a projection c of the first support section 102 on a plane perpendicular to the center axis partially overlaps with a projection d of the edge section 3022 of the second plate section 302 on the plane as viewed in the axial direction. This prevents turbulence between impeller 300 and lower plate portion 302, and increases the amount of air blown.
In one embodiment of the present embodiment, as shown in fig. 3, one end (B) of the first support portion 102 on the radial inner side is located radially inward of one end (D) of the edge portion 3022 of the second plate portion 302 on the radial inner side. This prevents turbulence generated by the plurality of blades 104, thereby reducing noise.
In one embodiment of the present embodiment, as shown in fig. 9, the first ribs 103 are arranged at equally spaced angles in the circumferential direction; as shown in fig. 7, the second rib 3023 is arranged at a different angle in the circumferential direction from the first rib 103. This reduces interference between the lower plate rib (second rib 3023) and the impeller rib (first rib 103), thereby reducing noise.
In the present embodiment, as shown in fig. 9 and 7, the number of the first ribs 103 and the second ribs 3023 may be the same, for example, three ribs may be provided, and thus the strength of the component can be ensured by the minimum number of ribs, and the maximum opening area of the intake port can be ensured.
In the present embodiment, as shown in fig. 9 and 7, the circumferential width of the second rib (lower plate rib) 3023 may be larger than the circumferential width of the first rib (impeller rib) 103, and thus, by increasing the circumferential width of the lower plate rib (second rib 3023), the vibration generated by the motor can be reduced.
In the present embodiment, as described above, the second support portion 3023 is used to support the motor 200, and the circuit board of the motor 200 may be disposed between the second support portion 3023 and the motor 200, as shown in fig. 7, whereby the air flowing in from the lower air intake port (the second air intake port 304) can cool the circuit board.
In the present embodiment, the impeller ribs (first ribs 103) are three as illustrated in fig. 9, but the present embodiment is not limited thereto, and the number of the first ribs 103 may be four or five or another number, and the present embodiment is not limited to the number of the impeller ribs (first ribs 103) on the premise of securing the area of the impeller opening 105.
In one embodiment of the present embodiment, as shown in fig. 6 and 7, a third rib portion 3024 may be further provided on a surface of the second plate portion 302 on a side close to the first plate portion 301, the third rib portion 3024 may protrude from the surface in a direction of the first plate portion 301, and the third rib portion 3024 may be provided radially outside the first support portion (impeller support portion) 102, that is, a projection of the first support portion 102 on the second plate portion 302 does not cover the third rib portion 3024. By providing the third rib 3024, the amount of exhaust from the exhaust port can be controlled, and turbulence can be prevented.
In the present embodiment, the number of the third rib portions 3024 is not limited, and may be a plurality of different lengths as shown in fig. 6 and 7, a plurality of the same length, or one.
In the present embodiment, as shown in fig. 6 and 7, the second side wall portion 306 may have a circular arc portion and a linear portion, and the third rib portion 3024 may be provided along the linear portion of the second side wall portion 306, for example, substantially parallel to the linear portion of the second side wall portion 306.
In one embodiment of the present embodiment, as shown in fig. 3, the relationship between the axial height E between the surface of the first plate portion 301 distant from the second plate portion 302 and the surface of the second plate portion 302 distant from the first plate portion 301 and the axial height F between the surface of the second plate portion 302 distant from the first plate portion 301 and the end of the motor 200 close to the first plate portion 301 is: the ratio of F to E is in the range of 0.5 to 0.8, i.e., F/E is 0.5 to 0.8. Therefore, the air quantity can be controlled by controlling the axial height of the motor 200, and air inlet is facilitated.
In one embodiment of the present embodiment, as shown in fig. 3, the ratio of the area of the impeller opening 105 to the area of the first suction port (upper suction port) 303 is in the range of 0.25 to 0.55. This reduces the loss of the amount of air flowing in from the upper intake port (first intake port 303), and increases the amount of air blown.
In the above embodiment, the opening area on the impeller side becomes large, the loss of the amount of air flowing from the intake port is reduced, and the amount of air blown is increased.
Example 2
This example provides a cooling device having the centrifugal fan described in example 1, and also having other conventional components. The present embodiment does not limit the structure, arrangement and function of the conventional components, and reference may be made to the prior art.
In this embodiment, the centrifugal fan of embodiment 1 has a large opening area on the impeller side, and thus reduces the loss of the amount of air flowing from the intake port and increases the amount of air blown.
The cooling device of the present embodiment may be any cooling device using a centrifugal fan, and may be, for example, a compressor using a centrifugal fan. However, the present embodiment is not limited thereto, and the centrifugal fan of embodiment 1 may be used as a centrifugal fan of other cooling devices, for example, an indoor unit of an air conditioner, an outdoor unit of an air conditioner, a centrifugal fan in a home appliance such as a water dispenser and a blower, or a centrifugal fan in various information devices and industrial devices.
While the invention has been described with reference to specific embodiments, it will be apparent to those skilled in the art that these descriptions are illustrative and not intended to limit the scope of the invention. Various modifications and alterations of this invention will become apparent to those skilled in the art based upon the spirit and principles of this invention, and such modifications and alterations are also within the scope of this invention.

Claims (14)

1. A centrifugal fan having:
an impeller is arranged on the upper portion of the shell,
a motor having a rotating portion that is disposed so as to be rotatable about a central axis and that drives the impeller to rotate; and
a housing that houses the impeller and the motor therein;
the housing has:
a first plate portion located on one axial side of the impeller and having a first intake port that penetrates in the axial direction;
a second plate portion that is located on the other axial side of the impeller and has a second air inlet that penetrates in the axial direction;
a first side wall portion extending from a radially outer edge of the first plate portion in a direction toward the second plate portion;
and
a second side wall portion extending from a radially outer edge of the second plate portion toward the first plate portion;
the impeller has:
a cup portion that houses the rotating portion of the motor;
a first support portion located radially outside the cup portion, the first support portion having a plurality of blades arranged in an axial direction; and
a first rib connecting the cup portion and the first support portion;
wherein a portion surrounded by the cup portion, the first support portion, and the first rib portion constitutes an impeller opening;
the area of the opening of the impeller is larger than that of the second air suction port.
2. The centrifugal fan of claim 1, wherein the second plate portion has:
a second support part supporting the motor;
a rim located radially outward of the second support portion; and
a second rib portion connecting the second support portion and the rim portion in a radial direction;
wherein a portion surrounded by the second support portion, the edge portion, and the second rib portion constitutes the second air inlet.
3. The centrifugal fan according to claim 1 or 2, wherein the cup portion is formed in a cylindrical shape extending in the axial direction, and an edge of a radially outermost side of the cylindrical cup portion, which is closer to the second plate portion, is closer to the first plate portion than an edge of a radially inner side of the first support portion, so that the first rib is provided obliquely.
4. The centrifugal fan according to claim 2, wherein the first support portion is expanded in a radial direction into a flat plate shape, the plurality of blades are arranged on a surface of the first support portion on a side close to the first plate portion, and a projection of the first support portion on a plane perpendicular to the central axis partially overlaps a projection of the edge portion of the second plate portion on the plane as viewed in an axial direction.
5. The centrifugal fan according to claim 2, wherein one end of a radially inner side of the first support portion is located closer to a radially inner side than one end of a radially inner side of the edge portion of the second plate portion.
6. The centrifugal fan of claim 2,
the first ribs are arranged at equal angular intervals in the circumferential direction;
the second ribs are arranged at a different angle in the circumferential direction from the first ribs.
7. The centrifugal fan of claim 6, wherein the number of first ribs and the number of second ribs are the same and are all three.
8. The centrifugal fan of claim 6, wherein the circumferential extent of said second ribs is greater than the circumferential extent of said first ribs.
9. The centrifugal fan according to claim 2, wherein a circuit board is disposed between the second support portion and the motor.
10. The centrifugal fan according to claim 1 or 2, wherein the number of the first ribs is four or five.
11. The centrifugal fan according to claim 1 or 2, wherein a third rib is provided on a surface of the second plate portion on a side close to the first plate portion, the third rib being provided radially outward of the first support portion.
12. The centrifugal fan according to claim 1 or 2, wherein a ratio of an axial height between a face of the second plate portion remote from the first plate portion to an end of the motor close to the first plate portion to an axial height between a face of the first plate portion remote from the second plate portion to a face of the second plate portion remote from the first plate portion is in a range of 0.5 to 0.8.
13. The centrifugal fan as claimed in claim 1 or 2, wherein a ratio of an area of the impeller opening to an area of the first suction port is in a range of 0.25 to 0.55.
14. A cooling device comprising a centrifugal fan according to any one of claims 1 to 13.
CN201810052742.7A 2018-01-19 2018-01-19 Centrifugal fan and cooling device comprising same Active CN110056514B (en)

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