U.S. patent application number 16/695085 was filed with the patent office on 2020-05-28 for axial fan and electrical device.
This patent application is currently assigned to NIDEC CORPORATION. The applicant listed for this patent is NIDEC CORPORATION. Invention is credited to Toshifumi FUKUI, Toshikazu FUKUNAGA, Yang LIU, Zhengyi XIA, Nobuaki YASUMOTO, Chenghui YU.
Application Number | 20200166040 16/695085 |
Document ID | / |
Family ID | 67426616 |
Filed Date | 2020-05-28 |
United States Patent
Application |
20200166040 |
Kind Code |
A1 |
YASUMOTO; Nobuaki ; et
al. |
May 28, 2020 |
AXIAL FAN AND ELECTRICAL DEVICE
Abstract
Embodiments of the disclosure provide an axial fan and an
electrical device. A center of a radial inner surface and a center
of a radial outer surface of a cylindrical portion of a housing of
the axial fan are disposed at different positions.
Inventors: |
YASUMOTO; Nobuaki; (Kyoto,
JP) ; LIU; Yang; (Dalian, CN) ; YU;
Chenghui; (Dalian, CN) ; FUKUNAGA; Toshikazu;
(Kyoto, JP) ; XIA; Zhengyi; (Dalian, CN) ;
FUKUI; Toshifumi; (Kyoto, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
NIDEC CORPORATION |
Kyoto |
|
JP |
|
|
Assignee: |
NIDEC CORPORATION
Kyoto
JP
|
Family ID: |
67426616 |
Appl. No.: |
16/695085 |
Filed: |
November 25, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F04D 29/522 20130101;
F04D 29/541 20130101; F04D 29/52 20130101; F04D 19/002 20130101;
F04D 25/08 20130101; F05D 2250/51 20130101 |
International
Class: |
F04D 19/00 20060101
F04D019/00; F04D 25/08 20060101 F04D025/08; F04D 29/52 20060101
F04D029/52 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 28, 2018 |
CN |
201821979346.0 |
Claims
1. An axial fan, comprising: a motor comprising a shaft rotatable
about a central axis; an impeller fixed to the shaft; and a housing
comprising a cylindrical portion disposed on a radial outer side of
the impeller and extending in an axial direction, wherein a center
of an axial projection of a radial inner surface of the cylindrical
portion is a first center, the first center being located on the
central axis, and a center of an axial projection of a radial outer
surface of the cylindrical portion is a second center, the second
center being at a position different from a position of the first
center in a direction perpendicular to the central axis.
2. The axial fan according to claim 1, wherein in the direction
perpendicular to the central axis, a radial width of a first region
of the cylindrical portion that is disposed on a second center side
based on the first center is greater than a radial width of a
second region of the cylindrical portion that is disposed on an
opposite side of the second center based on the first center, and a
housing recess that is recessed in the axial direction is formed in
the first region.
3. The axial fan according to claim 2, wherein a plurality of
housing recesses are formed in a circumferential direction.
4. The axial fan according to claim 3, wherein a first rib is
disposed between the plurality of housing recesses.
5. The axial fan according to claim 2, wherein the housing further
comprises: a base that overlaps with the motor in the axial
direction; and a second rib connecting the base and the radial
inner surface of the cylindrical portion, wherein the second rib
and the housing recess are provided at different positions in a
circumferential direction.
6. The axial fan according to claim 2, wherein in a direction
toward an air outlet of the axial fan, the radial inner surface of
the first region of the cylindrical portion inclines in a direction
away from the central axis.
7. The axial fan according to claim 1, wherein the cylindrical
portion comprises a cylindrical inner wall extending in the axial
direction, and a cylindrical outer wall that is disposed on a
radial outer side of the inner wall and extends in the axial
direction, the inner wall comprises the radial inner surface, and
the outer wall comprises the radial outer surface, and the inner
wall and the outer wall are connected by a third rib extending in a
radial direction.
8. The axial fan according to claim 1, wherein the housing further
comprises: an edge portion extending to the radial outer side from
an end of the cylindrical portion that is close to an air outlet of
the axial fan in the axial direction, and a center of an axial
projection of the edge portion is the second center.
9. An electrical device, comprising the axial fan according to
claim 1.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] The present invention claims priority under 35 U.S.C. .sctn.
119 to Chinese Application No. 201821979346.0 filed on Nov. 28,
2018 the entire content of which is incorporated herein by
reference.
BACKGROUND
Technical Field
[0002] The disclosure relates to the measurement field, and in
particular, to an axial fan.
Description of Related Art
[0003] In the conventional art, a cooling fan is mounted in the
housing of various electrical products to cool the electronic
components of the electrical product. Because heat generated by the
electronic components increases as the performance improves, and
the layout density increases as the size of the housing decreases,
static pressure and flow of the cooling fan need to be increased.
In order to meet this requirement, in recent years, an axial fan
has been used as a cooling fan to ensure a large static pressure
and an increased flow.
[0004] It should be noted that, the above introduction of the
technical background is only for the purpose of facilitating a
clear and complete description of the technical solutions of the
disclosure and facilitating the understanding by those skilled in
the art. The above technical solutions are not considered to be
well known to those skilled in the art simply because these
solutions are described in the background section of the
disclosure.
[0005] When the foregoing existing axial fan is mounted to an
actual electrical device, the air flow inside the electrical device
may be impeded due to the arrangement of other components of the
electrical device. As a result, fluidity of air on a side of the
electrical device is relatively poor.
SUMMARY OF THE INVENTION
[0006] According to an embodiment of the disclosure, an axial fan
is provided, and the axial fan includes: a motor having a shaft
that can rotate about a central axis; an impeller fixed to the
shaft; and a housing having a cylindrical portion disposed on a
radial outer side of the impeller and extending in an axial
direction, wherein a center of an axial projection of a radial
inner surface of the cylindrical portion is a first center, the
first center being located on the central axis; and a center of an
axial projection of a radial outer surface of the cylindrical
portion is a second center, the second center being at a position
different from a position of the first center in a direction
perpendicular to the central axis.
[0007] The above and other elements, features, steps,
characteristics and advantages of the present disclosure will
become more apparent from the following detailed description of the
preferred embodiments with reference to the attached drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] FIG. 1 is a cross-sectional view of an axial fan according
to an embodiment of the disclosure.
[0009] FIG. 2 is a bottom view of an axial fan according to
Embodiment 1 of the disclosure.
[0010] FIG. 3 is a perspective view of the axial fan according to
Embodiment 1 of the disclosure.
[0011] FIG. 4 is a schematic diagram of a relative position of an
internal structure of an electrical device according to Embodiment
2 of the disclosure.
DESCRIPTION OF THE EMBODIMENTS
[0012] The foregoing and other features of the disclosure will
become apparent from the following specification with reference to
the accompanying drawings. Specific implementations of the
disclosure are disclosed in the specification and the accompanying
drawings, which illustrate some implementations in which the
principles of the disclosure may be adopted. It should be
understood that, the disclosure is not limited to the
implementations described, and conversely, the disclosure includes
all modifications, variations and equivalents that fall within the
scope of the appended claims.
[0013] In the embodiments of the disclosure, for convenience of
description, a direction parallel to a central axis is referred to
as an "axial direction", a radial direction that is centered 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". However, the above is merely for
convenience of description and is not intended to limit the
orientation of the axial fan during use and manufacture.
[0014] The following describes the axial fan in the embodiments of
the disclosure with reference to the accompanying drawings.
[0015] FIG. 1 is a cross-sectional view of an axial fan according
to an embodiment of the disclosure. FIG. 2 is a bottom view of an
axial fan according to Embodiment 1 of the disclosure. FIG. 3 is a
perspective view of the axial fan according to Embodiment 1 of the
disclosure.
[0016] As shown in FIG. 1 and FIG. 2, the axial fan 10 includes: a
motor 100 having a shaft 110 that can rotate about a central axis
OO'; an impeller 200 fixed to the shaft 110; and a housing 300
having a cylindrical portion 310 disposed on a radial outer side of
the impeller 200 and extending in the axial direction. A center of
an axial projection of a radial inner surface 311 of the
cylindrical portion 310 is a first center C1, and the first center
is located on the central axis OO'. A center of an axial projection
of a radial outer surface 312 of the cylindrical portion 310 is a
second center C2, and the second center C2 is at a position
different from the position of the first center C1 in a direction
perpendicular to the central axis OO'.
[0017] In the present embodiment, the first center C1 is located on
the central axis OO', the second center is located on an axis AA'
of the radial outer surface 312 of the cylindrical portion 310, and
the axis AA' is deviated relative to the central axis OO' in a
direction perpendicular to the axial direction.
[0018] In the present embodiment, a direction of a relative offset
between the first center C1 and the second center C2 and the offset
may be set according to the actual requirement.
[0019] In this way, the first center C1 of the radial inner surface
311 and the second center C2 of the radial outer surface 312 are
disposed at different positions, so that a component that impedes
flowing of air in the electrical device can be avoided to some
extent, thereby improving air supply efficiency.
[0020] In the present embodiment, for the structures of the motor
100 and the impeller 200, please refer to the related art. In
addition, the axial fan 10 may further include some other existing
components. The descriptions thereof are omitted herein.
[0021] In the present embodiment, as shown in FIG. 2, in the
direction perpendicular to the central axis OO', a radial width of
a first region 313 of the cylindrical portion 310 that is disposed
on the side of the second center C2 (the left side in FIG. 2) based
on the first center C1 is greater than a radial width of a second
region 314 of the cylindrical portion 310 that is disposed on the
opposite side of the second center C2 based on the first center C1.
That is, the left side portion of the cylindrical portion 310 in
FIG. 2 is thicker, and the right side portion is thinner. In
addition, a housing recess 315 that is recessed in the axial
direction is formed in the first region 313.
[0022] In this way, the weight of the housing can be reduced and
shrinkage generated during molding can be prevented.
[0023] As shown in FIG. 2, a plurality of housing recesses 315 are
formed in the circumferential direction. The quantity and the size
of the housing recess 315 may be set according to the actual
requirement.
[0024] In the present embodiment, as shown in FIG. 2, a first rib
316 is disposed between the plurality of housing recesses 315. In
this way, the rigidity of the housing can be improved.
[0025] In the present embodiment, as shown in FIG. 2, the housing
300 may further include: a base 320 that overlaps with the motor
100 in the axial direction; and a second rib 330 connecting the
base 320 and the radial inner surface 311 of the cylindrical
portion 310, wherein the second rib 330 is at a position different
from the position of the housing recess 315 in the circumferential
direction.
[0026] In this way, the rigidity of the housing can be
improved.
[0027] As shown in FIG. 2, a plurality of second ribs 330 may be
disposed in the circumferential direction, and the quantity of
second ribs 330 may be determined according to the actual
requirement.
[0028] In the present embodiment, the radial inner surface 311 of
the first region 313 of the cylindrical portion 310 may be designed
to incline in a direction away from the central axis OO' in a
direction toward an air outlet of the axial fan 10 (an upward
direction in FIG. 1). In this way, an airflow from an upper surface
of the axial fan can be aggregated from the first center C1 to the
second center C2, thereby reducing exhaust resistance.
[0029] In the present embodiment, as shown in FIG. 3, the housing
300 may further include: an edge portion 320 extending to the
radial outer side from an end (an upper end in FIG. 1) of the
cylindrical portion 310 that is close to the air outlet of the
axial fan 10 in the axial direction, wherein a center of an axial
projection of the edge portion 320 is the second center C2. In this
way, installation precision of the axial fan during installation
can be improved.
[0030] In addition, the cylindrical portion 310 may include a
cylindrical inner wall extending in the axial direction, and a
cylindrical outer wall disposed on a radial outer side of the inner
wall and extending in the axial direction. The inner wall includes
the radial inner surface 311, and the outer wall includes the
radial outer surface 312, and the inner wall and the outer wall may
be connected by a third rib (not shown) extending in the radial
direction. In this way, the rigidity of the housing can be improved
while reducing the weight of the housing.
[0031] It can be known from the foregoing embodiment that, the
center of the radial inner surface and the center of the radial
outer surface of the cylindrical portion of the housing of the
axial fan are disposed at different positions, so that the
component that impedes flowing of air in the electrical device can
be avoided to some extent, thereby improving air supply
efficiency.
[0032] The present embodiment provides an electrical device, and
the electrical device includes the axial fan described in
Embodiment 1. A specific structure of the axial fan is described in
Embodiment 1. Content of the axial fan is incorporated herein, and
the descriptions thereof are omitted herein.
[0033] FIG. 4 is a schematic diagram of a relative position of an
internal structure of the electrical device according to Embodiment
2 of the disclosure. As shown in FIG. 4, the electrical device 20
includes the axial fan 10 and another component 30, and the another
component 30 is located on the right side below the axial fan
10.
[0034] As shown in FIG. 4, the another component 30 impedes flowing
of air on the right side, and as the center C1 of the radial inner
surface of the cylindrical portion 310 of the axial fan 10 is
configured to be deviated to the left side relative to the center
of the electrical device, the another component 30 can be avoided
to some extent, thereby improving air supply efficiency.
[0035] In the present embodiment, the electrical device may be any
electrical device that uses an axial fan. For example, the
electrical device may be a computer, acoustic equipment, a
projector, a communication device, a power supply, an air purifier,
or a medical device that uses an axial fan.
[0036] Features of the above-described preferred embodiments and
the modifications thereof may be combined appropriately as long as
no conflict arises. While preferred embodiments of the present
disclosure have been described above, it is to be understood that
variations and modifications will be apparent to those skilled in
the art without departing from the scope and spirit of the present
disclosure. The scope of the present disclosure, therefore, is to
be determined solely by the following claims.
* * * * *