U.S. patent application number 11/230451 was filed with the patent office on 2007-01-18 for pump.
This patent application is currently assigned to DELTA ELECTRONICS, INC.. Invention is credited to Hou-Chu Chen, Wen-Chuan Chen, Chin-Chu Hsu, Wen-Shi Huang.
Application Number | 20070014677 11/230451 |
Document ID | / |
Family ID | 37022131 |
Filed Date | 2007-01-18 |
United States Patent
Application |
20070014677 |
Kind Code |
A1 |
Chen; Wen-Chuan ; et
al. |
January 18, 2007 |
Pump
Abstract
A housing of a pump includes a fluid inlet and a fluid outlet. A
rotor of the pump is disposed in the housing and includes a
rotating portion, a magnet, and a bearing. The magnet is disposed
on one side of the rotating portion. The bearing is disposed in the
center of the rotating portion. A stator is disposed in the housing
and corresponds to the magnet of the rotor, providing
electromagnetic force required for rotation of the rotor. The
rotating portion, magnet, and bearing are integrally formed as
single unit by injection molding.
Inventors: |
Chen; Wen-Chuan; (Taoyuan
Hsien, TW) ; Chen; Hou-Chu; (Taoyuan Hsien, TW)
; Hsu; Chin-Chu; (Taoyuan Hsien, TW) ; Huang;
Wen-Shi; (Taoyuan Hsien, TW) |
Correspondence
Address: |
BIRCH STEWART KOLASCH & BIRCH
PO BOX 747
FALLS CHURCH
VA
22040-0747
US
|
Assignee: |
DELTA ELECTRONICS, INC.
|
Family ID: |
37022131 |
Appl. No.: |
11/230451 |
Filed: |
September 21, 2005 |
Current U.S.
Class: |
417/423.1 |
Current CPC
Class: |
F05D 2300/171 20130101;
F05D 2300/43 20130101; F04D 13/0673 20130101; F05D 2230/54
20130101; F04D 29/026 20130101 |
Class at
Publication: |
417/423.1 |
International
Class: |
F04B 17/00 20060101
F04B017/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 15, 2005 |
TW |
94212103 |
Claims
1. A pump, comprising: a housing having an inlet and an outlet; a
rotor disposed in the housing and comprising a rotating portion, a
magnet, and a bearing, wherein the magnet is disposed on one side
of the rotating portion, and the bearing is disposed in the center
of the rotating portion; and a stator disposed in the housing and
corresponding to the magnet of the rotor for providing
electromagnetic force required for rotation of the rotor; wherein
the rotating portion, magnet, and bearing are integrally formed as
a single unit.
2. The pump as claimed in claim 1, wherein the rotor is integrally
formed by plastic injection molding.
3. The pump as claimed in claim 1, wherein the magnet is disposed
in the interior of the rotating portion.
4. The pump as claimed in claim 3, wherein the stator is disposed
in the interior of the rotor.
5. The pump as claimed in claim 1, wherein the magnet is disposed
in the exterior of the rotating portion.
6. The pump as claimed in claim 5, wherein the stator is disposed
in the exterior of the rotor.
7. The pump as claimed in claim 1, further comprising a shaft
axially penetrating the rotor.
8. The pump as claimed in claim 7, wherein the housing further
comprises a top cover and a frame body, and an accommodation
chamber is formed between the top cover and the frame body for
accommodating the rotor.
9. The pump as claimed in claim 8, wherein the housing further
comprises a bottom cover, and a sealed chamber is formed between
the bottom cover and the frame body for accommodating the
stator.
10. The pump as claimed in claim 1, wherein the stator comprises a
plurality of stacked silicon steel sheets and a coil.
11. The pump as claimed in claim 1, wherein the pump is a
centrifugal pump.
12. The pump as claimed in claim 1, wherein the rotor further
comprises a plurality of blades on a top surface thereof.
Description
BACKGROUND
[0001] The invention relates to a pump, and in particular to a
centrifugal pump with an integrally formed rotor.
[0002] Referring to FIG. 1, a conventional centrifugal pump
comprises a rotating portion 10, a bearing 12, and a magnet 14. The
rotating portion 10, bearing 12, and magnet 14 are individually and
separately manufactured and then assembled together by press
fitting to form a rotor.
[0003] As the rotating portion 10, bearing 12, and magnet 14
respectively provide tolerances, deviation of concentricity and
roundness of the rotor after assembly is large. Operation of the
centrifugal pump is thus adversely affected. Namely, moment of
inertia, vibration, and noise may be generated during operation of
the centrifugal pump, adversely affecting output performance
thereof.
[0004] Moreover, because the rotating portion 10, bearing 12, and
magnet 14 are individually and separately manufactured and then
assembled together by press fitting, connection and engagement
therebetween is weak, reducing reliability of the rotor.
SUMMARY
[0005] Accordingly, the present invention provides a pump
comprising a housing, a rotor, and a stator. The housing comprises
a fluid inlet and a fluid outlet. The rotor is disposed in the
housing and comprises a rotating portion, a magnet, and a bearing.
The magnet is disposed on one side of the rotating portion. The
bearing is disposed in the center of the rotating portion. The
stator is disposed in the housing and corresponds to the magnet of
the rotor, providing electromagnetic force required for rotation of
the rotor. The rotating portion, magnet, and bearing are integrally
formed.
[0006] The rotor is integrally formed by plastic injection
molding.
[0007] The magnet is disposed in the interior or exterior of the
rotating portion.
[0008] The stator is disposed in the interior or exterior of the
rotor.
[0009] The pump further comprises a shaft axially penetrating the
rotor.
[0010] The housing further comprises a top cover and a frame body.
An accommodation chamber is formed between the top cover and the
frame body for accommodating the rotor.
[0011] The housing further comprises a bottom cover. A sealed
chamber is formed between the bottom cover and the frame body for
accommodating the stator.
[0012] The stator comprises a plurality of stacked silicon steel
sheets and a coil.
[0013] The pump comprises a centrifugal pump.
[0014] The rotor comprises a plurality of blades on a top surface
thereof.
[0015] During integral formation of the rotor, the magnet and
bearing are placed in a mold forming the rotor. The rotor is
integrally formed with the magnet and bearing by plastic injection
molding. The housing, rotor, shaft, and stator are then assembled
to form the centrifugal pump.
[0016] The centrifugal pump can be an outer-rotor type or
inner-rotor type pump. In the outer-rotor type pump, the stator is
disposed in the interior of the rotor. In the inner-rotor type
pump, the stator is disposed in the exterior of the rotor.
DESCRIPTION OF THE DRAWINGS
[0017] The invention can be more fully understood by reading the
subsequent detailed description and examples with references made
to the accompanying drawings, wherein:
[0018] FIG. 1 is a schematic exploded view of a rotor of a
conventional centrifugal pump;
[0019] FIG. 2A is a schematic cross section of a rotor of an
outer-rotor type centrifugal pump of an embodiment of the
invention;
[0020] FIG. 2B is a schematic cross section of a rotor of an
inner-rotor type centrifugal pump of an embodiment of the
invention;
[0021] FIG. 3A is a schematic cross section of an outer-rotor type
centrifugal pump of an embodiment of the invention; and
[0022] FIG. 3B is a schematic cross section of an inner-rotor type
centrifugal pump of an embodiment of the invention.
DETAILED DESCRIPTION
First embodiment
[0023] Referring to FIG. 2A and FIG. 3A, the (outer-rotor type)
centrifugal pump comprises a housing 20, a rotor 22, a stator 24,
and a shaft 26. The stator 24 is disposed in the interior of the
rotor 22. The shaft 26 axially penetrates the rotor 22.
[0024] The rotor 22, stator 24, and shaft 26 are disposed in the
housing 20 comprising a top cover 201, a frame body 202, and a
bottom cover 203. An accommodation chamber is formed between the
top cover 201 and the frame body 202 for accommodating the rotor
22. The top cover 201 comprises a fluid inlet 2011 and a fluid
outlet 2012, both shown by dashed lines in FIG. 3A. The fluid inlet
2011 and fluid outlet 2012 respectively take in and output fluid,
such as water, when the centrifugal pump operates. The bottom cover
203 is disposed opposite the top cover 201. A sealed chamber is
formed between the bottom cover 203 and the frame body 202 for
accommodating the stator 24. Two ends of the shaft 26 are fixed to
the top cover 201 and frame body 202, respectively. The rotor 22
rotates around the shaft 26.
[0025] The rotor 22 comprises a plastic rotating portion 221, a
magnet 222, a bearing 223, and a plurality of blades 224. The
magnet 222 is disposed on the inner wall of the rotating portion
221. The bearing 223 is disposed in the center of the rotating
portion 221 and supports the shaft 26. The blades 224 are formed on
the top surface of the rotating portion 221. A gap exists between
the rotor 22 and the top cover 201 and between the rotor 22 and the
frame body 202, allowing the fluid to flow therethrough.
[0026] The stator 24 is disposed in the interior of the rotor 22
and comprises a plurality of stacked silicon steel sheets and a
coil surrounding the silicon steel sheets. The stator 24
corresponds to and is coupled to the rotor 22. When the coil is
applied with electricity, electromagnetic force is generated to
rotate the rotor 22.
[0027] The rotor 22 is integrally formed. Specifically, during
integral formation of the rotor 22, the magnet 222 and bearing 223
are placed in a mold forming the rotor 22. The rotating portion 221
is integrally formed with the magnet 222 and bearing 223 as a
single unit by plastic injection molding. The housing 20, rotor 22,
stator 24, and shaft 26 are then assembled to form the centrifugal
pump.
Second embodiment
[0028] Referring to FIG. 2B and FIG. 3B, the (inner-rotor type)
centrifugal pump comprises a housing 30, a rotor 32, a stator 34,
and a shaft 36. The stator 34 is disposed in the exterior of the
rotor 32. The shaft 36 axially penetrates the rotor 32.
[0029] The rotor 32, stator 34, and shaft 36 are disposed in the
housing 30 comprising a top cover 301, a frame body 302, and a
bottom cover 303. An accommodation chamber is formed between the
top cover 301 and the frame body 302 for accommodating the rotor
32. The top cover 301 comprises a fluid inlet 3011 and a fluid
outlet 3012, both shown by dashed lines in FIG. 3B. The fluid inlet
3011 and fluid outlet 3012 respectively take in and output fluid,
such as water, when the centrifugal pump operates. The bottom cover
303 is disposed opposite the top cover 301. A sealed chamber is
formed between the bottom cover 303 and the frame body 302 for
accommodating the stator 34. Two ends of the shaft 36 are fixed to
the top cover 301 and frame body 302, respectively. The rotor 32
rotates around the shaft 36.
[0030] The rotor 32 comprises a plastic rotating portion 321, a
magnet 322, a bearing 323, and a plurality of blades 324. The
magnet 322 is disposed on the outer wall of the rotating portion
321. The bearing 323 is disposed in the center of the rotating
portion 321 and supports the shaft 36. The blades 324 are formed on
the top surface of the rotating portion 321. A gap exists between
the rotor 32 and the top cover 301 and between the rotor 32 and the
frame body 302, allowing the fluid to flow therethrough.
[0031] The stator 34 is disposed in the exterior of the rotor 32
and comprises a plurality of stacked silicon steel sheets and a
coil surrounding the silicon steel sheets. The stator 34
corresponds to and is coupled to the rotor 32. When the coil is
applied with electricity, electromagnetic force is generated to
rotate the rotor 32.
[0032] Similarly, the rotor 32 is integrally formed. During
integral formation of the rotor 32, the magnet 322 and bearing 323
are placed in a mold forming the rotor 32. The rotating portion 321
is integrally formed with the magnet 322 and bearing 323 as a
single unit by plastic injection molding. The housing 30, rotor 32,
stator 34, and shaft 36 are then assembled to form the centrifugal
pump.
[0033] In conclusion, in the disclosed centrifugal pumps, the
rotors are integrally formed, such that manufacturing costs thereof
are reduced. Moreover, because the precision of each member in the
rotors is promoted or the tolerance provided by each member therein
is reduced after injection molding, concentricity and roundness of
the rotors are enhanced. As connection strength and reliability of
the disclosed centrifugal pumps are enhanced, moment of inertia,
vibration, and noise provided thereby are reduced.
[0034] While the invention has been described by way of example and
in terms of preferred embodiment, it is to be understood that the
invention is not limited thereto. To the contrary, it is intended
to cover various modifications and similar arrangements (as would
be apparent to those skilled in the art). Therefore, the scope of
the appended claims should be accorded the broadest interpretation
so as to encompass all such modifications and similar
arrangements.
* * * * *