U.S. patent application number 11/964926 was filed with the patent office on 2009-07-02 for centrifugal blower and bottom housing thereof.
This patent application is currently assigned to FU ZHUN PRECISION INDUSTRY (SHEN ZHEN) CO., LTD.. Invention is credited to CHING-BAI HWANG, ZHI-HUI ZHAO.
Application Number | 20090169373 11/964926 |
Document ID | / |
Family ID | 40798671 |
Filed Date | 2009-07-02 |
United States Patent
Application |
20090169373 |
Kind Code |
A1 |
HWANG; CHING-BAI ; et
al. |
July 2, 2009 |
CENTRIFUGAL BLOWER AND BOTTOM HOUSING THEREOF
Abstract
A centrifugal blower (10) includes a bottom housing (12), a top
cover (14) covering the bottom housing, and an impeller (16) and a
stator accommodated in a space formed between the bottom housing
and the top cover. The bottom housing includes a base plate (121),
and a sidewall (122) surrounding the base plate. The sidewall
includes a tongue (126) extending from the sidewall towards an
inner space enclosed by an inner surface of the sidewall. The
tongue is slantingly arranged with respect to a top surface (121a)
of the base plate and size of a transverse section of tongue is
variable changing along a height direction of the tongue.
Inventors: |
HWANG; CHING-BAI; (Tu-Cheng,
TW) ; ZHAO; ZHI-HUI; (Shenzhen, CN) |
Correspondence
Address: |
PCE INDUSTRY, INC.;ATT. Steven Reiss
458 E. LAMBERT ROAD
FULLERTON
CA
92835
US
|
Assignee: |
FU ZHUN PRECISION INDUSTRY (SHEN
ZHEN) CO., LTD.
Shenzhen City
CN
FOXCONN TECHNOLOGY CO., LTD.
Tu-Cheng
TW
|
Family ID: |
40798671 |
Appl. No.: |
11/964926 |
Filed: |
December 27, 2007 |
Current U.S.
Class: |
415/206 ;
415/208.1 |
Current CPC
Class: |
F04D 29/422 20130101;
F04D 25/0613 20130101 |
Class at
Publication: |
415/206 ;
415/208.1 |
International
Class: |
F04D 29/44 20060101
F04D029/44; F04D 29/42 20060101 F04D029/42 |
Claims
1. A bottom housing of a centrifugal blower comprising: a base
plate; and a sidewall surrounding the base plate, the sidewall
comprising a tongue extending from the sidewall towards an inner
space enclosed by an inner surface of the sidewall, the tongue
being slantingly arranged with respect to a top surface of the base
plate.
2. The bottom housing of claim 1, wherein a size of a transverse
section of the tongue gradually decreases along a height direction
from a bottommost end towards a topmost end of the tongue.
3. The bottom housing of claim 1, wherein a size of a transverse
section of the tongue gradually increases along a height direction
from a bottommost end towards a topmost end of the tongue.
4. The bottom housing of claim 1, wherein a size of a transverse
section of the tongue gradually decreases along directions
respectively from an axially middle portion of the tongue towards a
bottommost end and towards a topmost end of the tongue.
5. The bottom housing of claim 1, wherein a size of a transverse
section of the tongue gradually increases along directions
respectively from an axially middle portion of the tongue towards a
bottommost end and towards a topmost end of the tongue.
6. A centrifugal blower comprising: a bottom housing; a top cover
covering the bottom housing; and an impeller and a stator
accommodated in a space formed between the bottom housing and the
top cover, wherein the bottom housing comprising: a base plate; and
a sidewall surrounding the base plate, the sidewall comprising a
tongue extending from the sidewall towards an inner space enclosed
by an inner surface of the sidewall, the tongue being slantingly
arranged with respect to a top surface of the base plate.
7. The centrifugal blower of claim 6, wherein a size of a
transverse section of the tongue gradually decreases along a height
direction from a bottommost end towards a topmost end of the
tongue.
8. The centrifugal blower of claim 6, wherein a size of a
transverse section of the tongue gradually increases along a height
direction from a bottommost end towards a topmost end of the
tongue.
9. The centrifugal blower of claim 6, wherein a size of a
transverse section of the tongue gradually decreases along
directions respectively from an axially middle portion of the
tongue towards a bottommost end and towards a topmost end of the
tongue.
10. The centrifugal blower of claim 6, wherein a size of a
transverse section of the tongue gradually increases along
directions respectively from an axially middle portion of the
tongue towards a bottommost end and towards a topmost end of the
tongue.
11. The centrifugal blower of claim 6, wherein the sidewall define
an air outlet which comprises a near side and a far side, an
airflow generated by the impeller arriving at the air outlet and
flowing from the near side towards the far side, the tongue being
arranged adjacent to the far side of the air outlet.
12. A centrifugal blower comprising: a bottom housing; a top cover
covering the bottom housing; and an impeller and a stator
accommodated in a space formed between the bottom housing and the
top cover, wherein the bottom housing comprising: a base plate; and
a sidewall surrounding the base plate, the sidewall comprising a
tongue extending from the sidewall towards an inner space enclosed
by an inner surface of the sidewall, a size of a transverse section
of tongue being variable changing along a height direction of the
tongue.
13. The centrifugal blower of claim 12, wherein the tongue has a
triangular profile and comprises an inner surface which comprises a
first surface adjacent to the impeller, a second surface opposite
to the first surface, and a third surface connecting the first
surface with the second surface.
14. The centrifugal blower of claim 13, wherein a size of a
transverse section of the tongue gradually decreases along a height
direction from a bottommost end towards a topmost end of the
tongue.
15. The centrifugal blower of claim 13, wherein a size of a
transverse section of the tongue gradually increases along a height
direction from a bottommost end towards a topmost end of the
tongue.
16. The centrifugal blower of claim 13, wherein a size of a
transverse section of the tongue gradually decreases along
directions respectively from an axially middle portion of the
tongue towards a bottommost end and towards a topmost end of the
tongue.
17. The centrifugal blower of claim 13, wherein a size of a
transverse section of the tongue gradually increases along
directions respectively from an axially middle portion of the
tongue towards a bottommost end and towards a topmost end of the
tongue.
18. The centrifugal blower of claim 12, wherein the sidewall define
an air outlet which comprises a near side and a far side, an
airflow generated by the impeller arriving at the air outlet and
flowing from the near side towards the far side, the tongue being
arranged adjacent to the far side of the air outlet.
Description
BACKGROUND
[0001] 1. Technical Field
[0002] The present invention relates to centrifugal blowers and
bottom housings thereof, and more particularly to a bottom housing
which helps to decrease noise generated by a centrifugal
blower.
[0003] 2. Description of related art
[0004] With continuing development of the electronic technology,
electronic components such as CPUs generate more and more heat that
is required to be dissipated immediately.
[0005] Conventionally, a centrifugal blower is used to produce an
airflow which can remove heat from the electronic component. The
centrifugal blower comprises a stator and an impeller being
rotatable with respect to the stator. The impeller further
comprises a hub and a plurality of blades radially and outwardly
extending from the hub. In use, the blades of the impeller rotate
around the stator to drive the airflow to flow towards the
electronic component, thus cooling the electronic component
continuously.
[0006] Increasing revolving speed of the impeller relatively
increases the amount of airflow, therefore a heat dissipation
efficiency is relatively improved. However, increasing the
revolving speed may correspondingly cause a rise of a noise level
generated by the centrifugal blower, thus making a user near the
fan feel uncomfortable.
[0007] What is needed, therefore, is an impeller which can overcome
the above-mentioned disadvantage.
SUMMARY
[0008] The present invention, in one aspect, provides a bottom
housing of a centrifugal. The bottom housing includes a base plate,
and a sidewall surrounding the base plate. The sidewall includes a
tongue extending from the sidewall towards an inner space enclosed
by an inner surface of the sidewall. The tongue is slantingly
arranged with respect to a top surface of the base plate.
[0009] The present invention, in another aspect, provides a
centrifugal blower using the bottom housing. The centrifugal blower
includes a bottom housing, a top cover covering the bottom housing,
and an impeller and a stator accommodated in a space formed between
the bottom housing and the top cover. The bottom housing includes a
base plate, and a sidewall surrounding the base plate. The sidewall
includes a tongue extending from the sidewall towards an inner
space enclosed by an inner surface of the sidewall. The tongue is
slantingly arranged with respect to a top surface of the base
plate.
[0010] The present invention, in a further aspect, provides a
centrifugal blower using the bottom housing. The centrifugal blower
includes a bottom housing, a top cover covering the bottom housing,
and an impeller and a stator accommodated in a space formed between
the bottom housing and the top cover. The bottom housing includes a
base plate, and a sidewall surrounding the base plate. The sidewall
includes a tongue extending from the sidewall towards an inner
space enclosed by an inner surface of the sidewall. A size of a
transverse section of tongue is variable changing along a height
direction of the tongue.
[0011] Other advantages and novel features of the present impeller
and centrifugal blower will become more apparent from the following
detailed description of preferred embodiments when taken in
conjunction with the accompanying drawings, in which:
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] FIG. 1 is an exploded, isometric view of a centrifugal
blower according to a preferred embodiment of the present
invention.
[0013] FIG. 2 is a top view of the centrifugal blower of FIG. 1
with a top cover being removed.
[0014] FIG. 3 is an isometric view of a bottom housing of the
centrifugal blower according to a second embodiment of the present
invention.
[0015] FIG. 4 is an isometric view of a bottom housing of the
centrifugal blower according to a third embodiment of the present
invention.
[0016] FIG. 5 is an isometric view of a bottom housing of the
centrifugal blower according to a fourth embodiment of the present
invention.
DETAILED DESCRIPTION
[0017] When a flow field of the airflow of a related centrifugal
blower was simulated by using computational fluid dynamics (CFD)
software, it was found that there were harmonic waves superposing
at an area between free ends of the blades and an inner surface of
a tongue formed on the centrifugal blower, which is a reason for an
increase of noise generated by the centrifugal blower. After many
times of experiments and tests, applicants further found that the
superposition of the harmonic waves was generated due to the inner
surface of the tongue perpendicular to a planar top surface of a
bottom housing of the related centrifugal blower. Therefore,
applicant contrives to solve such problems of the related art.
[0018] Reference will now be made to the drawing figures to
describe the preferred embodiment in detail.
[0019] Referring to FIG. 1, the centrifugal blower 10 includes a
bottom housing 12, a top cover 14 covering the bottom housing 12,
and an impeller 16 and a stator (not shown) accommodated in a space
formed between the bottom housing 12 and the top cover 14.
[0020] The bottom housing 12 includes a base plate 121 and a
sidewall 122 extending upwardly from and surrounding the base plate
121. The base plate 121 of the bottom housing 12 and the top cover
14 respectively define an air inlet 123 therein. The sidewall 122
of the bottom housing 12 defines an air outlet 124 which is
perpendicular to the air inlets 123. The air outlet 124 has a near
side 124a and a far side 124b confronting to the near side 124a.
During operation of the centrifugal blower 10, airflow arrives at
the air outlet 124 and flows from the near side 124a towards the
far side 124b.
[0021] The impeller 16 includes a hub 162 and a plurality of blades
164 radially and outwardly extending from the hub 162. An air
channel 125 is formed between free ends of the blades 164 and an
inner surface of the sidewall 122 of the bottom housing 12. A width
of the air channel 125 gradually increases along a counterclockwise
direction from the far side 124b towards the near side 124a of the
air outlet 124.
[0022] The sidewall 122 of the bottom housing 12 includes a tongue
126 near the far side 124b of the air outlet 124. Particularly
referring to FIG. 2, the tongue 126 is substantially triangular
shaped in profile and integrally extends from the sidewall 122
towards an inner space enclosed by an inner surface of the sidewall
122 of the centrifugal blower 10. The tongue 126 has a first
surface 126a near the air channel 125 and the impeller 16 and is
located near the far side 124b of the air outlet 124, a second
surface 126b which faces away the air channel 125 and the impeller
16, and a third surface 126c which smoothly and integrally connects
the first surface 126a with the second surface 126b. The first
surface 126a is an arc-shaped surface which extends along an
extension direction of the air channel 125. The second surface 126b
is substantially to be a planar surface. An extension direction of
an outermost terminal end of the first surface 126a forms an obtuse
angle with an extension direction of an innermost terminal end of
the second surface 126b. Alternatively, the extension direction of
the outermost terminal end of the first surface 126a may form an
acute or a right angle with the extension direction of the
innermost terminal end of the second surface 126b.
[0023] The first, second and third surfaces 126a, 126b, 126c
cooperatively form an inner surface 126d of the tongue 126. The
first, second and third surfaces 126a, 126b, 126c of the inner
surface 126d of the tongue 126 respectively and gradually inclines
towards an outer surface of the sidewall 122 of the bottom housing
12 from a bottommost end of the tongue 126 towards a topmost end of
the tongue 126. That is, the inner surface 126d of the tongue 126
is slantingly arranged with respect to a planar top surface 121a of
the base plate 121 of the bottom housing 12. A size of a transverse
cross section of tongue 126 gradually decreases along a direction
from the base plate 121 of the bottom housing 12 towards the top
cover 14.
[0024] In the present centrifugal blower 10, the inner surface 126d
of the tongue 126 is slantingly arranged with respect to the top
surface 121a of the base plate 121 of the bottom housing 12. The
slantwise inner surface 126d of the tongue 126 disturbs the
superposition of the harmonic waves and thereby decreases noise
generated by the present centrifugal blower 10.
[0025] In the preferred embodiment, the size of the transverse
cross section of tongue 126 gradually decreases along the direction
from the base plate 121 of the bottom housing 12 towards the top
cover 14. Alternatively, referring to FIG. 3, the size of the
transverse section of the tongue 126 gradually increases along the
direction from the base plate 121 of the bottom housing 12 towards
the top cover 14. Referring to FIG. 4, the size of the transverse
section of tongue 126 gradually decreases along directions
respectively from an axially middle portion 126e of the tongue 126
towards the base plate 121 of the bottom housing 12 and towards the
top cover 14. Referring to FIG. 5, the size of the transverse
section of tongue 126 gradually increases along directions
respectively from the axially middle portion 126e of the tongue 126
towards the base plate 121 of the bottom housing 12 and towards the
top cover 14. That is, the size of the transverse section of the
tongue 126 may change along a height direction of the tongue
126.
[0026] In the preferred embodiment, the inner surface 126d of the
tongue 126, i.e., the first, second and third surfaces 126a, 126b,
126c of the tongue 126 are slantingly arranged with respect to the
top surface 121 a of the base plate 121 of the bottom housing 12.
Alternatively, there may be only one or two of the first, second
and third surfaces 126a, 126b, 126c of the inner surface 126d of
the tongue 126 being slantingly arranged with respect to the top
surface 121a of the base plate 121 of the bottom housing 12.
[0027] It is to be understood, however, that even though numerous
characteristics and advantages of the present invention have been
set forth in the foregoing description, together with details of
the structure and function of the invention, the disclosure is
illustrative only, and changes may be made in detail, especially in
matters of shape, size, and arrangement of parts within the
principles of the invention to the full extent indicated by the
broad general meaning of the terms in which the appended claims are
expressed.
* * * * *