U.S. patent application number 11/226301 was filed with the patent office on 2006-12-14 for centrifugal pump.
This patent application is currently assigned to DELTA ELECTRONICS, INC.. Invention is credited to Hou-Chu Chen, Chin-Chu Hsu, Wen-Shi Huang, Shui-Fa Tsai.
Application Number | 20060280631 11/226301 |
Document ID | / |
Family ID | 37524271 |
Filed Date | 2006-12-14 |
United States Patent
Application |
20060280631 |
Kind Code |
A1 |
Tsai; Shui-Fa ; et
al. |
December 14, 2006 |
Centrifugal pump
Abstract
A housing of a centrifugal pump includes a fluid inlet, a fluid
outlet, and an accommodation chamber. An impeller of the pump is
disposed in the accommodation chamber and includes at least one
venthole axially penetrating the impeller. A drive member is fixed
to one side of the housing and corresponds to the impeller for
providing electromagnetic force required for rotation of the
impeller. A central shaft penetrates the center of the impeller and
axially extends to the drive member.
Inventors: |
Tsai; Shui-Fa; (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: |
37524271 |
Appl. No.: |
11/226301 |
Filed: |
September 15, 2005 |
Current U.S.
Class: |
417/423.1 |
Current CPC
Class: |
F04D 13/0673 20130101;
F04D 9/006 20130101; F04D 13/0606 20130101 |
Class at
Publication: |
417/423.1 |
International
Class: |
F04B 17/00 20060101
F04B017/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 10, 2005 |
TW |
94119254 |
Claims
1. A centrifugal pump, comprising: a housing having an inlet, an
outlet, and an accommodation chamber; an impeller disposed in the
accommodation chamber and comprising at least one venthole
penetrating the impeller; a drive member fixed to one side of the
housing and corresponding to the impeller for providing
electromagnetic force required for rotation of the impeller; and a
shaft penetrating the center of the impeller and axially extending
to the drive member.
2. The centrifugal pump as claimed in claim 1, wherein the impeller
further comprises a rotating portion and a plurality of blades, the
venthole axially penetrates the rotating portion, and the blades
are formed on a surface of the rotating portion.
3. The centrifugal pump as claimed in claim 1, wherein the inlet,
outlet, and accommodation chamber are communicated with one
another.
4. The centrifugal pump as claimed in claim 1, wherein a gap exists
between the housing and the impeller.
5. The centrifugal pump as claimed in claim 1, wherein the housing
further comprises a cover and an outer frame, the accommodation
chamber is between the cover and the outer frame, the inlet and
outlet are formed and extend in the cover.
6. The centrifugal pump as claimed in claim 5, wherein the outer
frame surrounds the drive member, preventing a fluid from entering
the drive member.
7. The centrifugal pump as claimed in claim 5, wherein the housing
further comprises a base opposite to the cover, and the drive
member is fixed to the base.
8. The centrifugal pump as claimed in claim 1, wherein the shaft
comprises a spiral groove on the surface thereof.
9. The centrifugal pump as claimed in claim 8, wherein the spiral
direction of the spiral groove corresponds to the rotational
direction of the impeller.
10. A centrifugal pump, comprising: a housing having an inlet, an
outlet, and an accommodation chamber; an impeller disposed in the
accommodation chamber; a drive member fixed to one side of the
housing and corresponding to the impeller for providing
electromagnetic force required for rotation of the impeller; and a
shaft penetrating the center of the impeller and extending to the
drive member, wherein the shaft comprises a spiral groove on the
surface thereof.
11. The centrifugal pump as claimed in claim 10, wherein the spiral
direction of the spiral groove corresponds to the rotational
direction of the impeller, such that air under the impeller moves
upward along the spiral groove.
12. The centrifugal pump as claimed in claim 10, wherein the
impeller comprises a rotating portion and a plurality of blades
formed on a surface of the rotating portion.
13. The centrifugal pump as claimed in claim 10, wherein the inlet,
outlet, and accommodation chamber are communicated with one
another.
14. The centrifugal pump as claimed in claim 10, wherein a gap
exists between the housing and the impeller.
15. The centrifugal pump as claimed in claim 10, wherein the
housing further comprises a cover and an outer frame, the
accommodation chamber is between the cover and the outer frame, the
inlet and outlet are formed and extend in the cover.
16. The centrifugal pump as claimed in claim 15, wherein the outer
frame surrounds the drive member, preventing a fluid from entering
the drive member.
17. The centrifugal pump as claimed in claim 15, wherein the
housing further comprises a base opposite to the cover, and the
drive member is fixed to the base.
18. The centrifugal pump as claimed in claim 10, wherein the
impeller comprises a venthole axially penetrating the impeller.
Description
BACKGROUND
[0001] The invention relates to a centrifugal pump, and in
particular to a centrifugal pump with a vent structure enabling
removal of air therefrom.
[0002] Referring to FIG. 1, a conventional centrifugal pump
comprises a housing 1, an impeller 2, a stator 3, and a central
shaft 4. The stator 3 is able to activate the impeller 2 rotating
with the central shaft 4.
[0003] The housing 1 comprises an accommodation chamber in which
the impeller 2 is disposed. The housing 1 further comprises a water
inlet 10 and a water outlet 12. Water flows into the centrifugal
pump via the water inlet 10. In another aspect, water flows out of
the centrifugal pump along the rotational direction of the impeller
2 and via the water outlet 12.
[0004] The impeller 2 comprises a rotating portion 20 and a
plurality of blades 22 disposed thereon.
[0005] The stator 3 is disposed under the impeller 2 and coupled to
the rotating portion 20, activating the impeller 2 by
electromagnetic force when electricity is applied thereto. The
central shaft 4 axially penetrates the center of the impeller 2 and
extends to the stator 3.
[0006] The water inlet 10, water outlet 12, and accommodation
chamber of the housing 1 are connected to and communicated with one
another. During operation of the conventional centrifugal pump,
water flows to the impeller 2 via the water inlet 10 and obtains
kinetic energy by rotation of the impeller 2. The water then flows
out of the centrifugal pump via the water outlet 12 by centrifugal
force provided by the blades 22 of the impeller 2.
[0007] Nevertheless, at startup or during operation of the
conventional centrifugal pump, air inevitably enters the
centrifugal pump, adversely affecting the pumping pressure and
causing the impeller 2 to idle. Air binding is thus generated.
[0008] Moreover, when the centrifugal pump operates in the presence
of air and water, rotational balance of the impeller 2 is adversely
affected to cause noise. Furthermore, air erosion is easily
generated in the centrifugal pump. Namely, air bubbles in the
centrifugal pump break and strike the impeller 2 during rapid
movement of the water and the air bubbles, ablating the surfaces of
the blades 22 of the impeller 2 and thereby causing damage
thereto.
SUMMARY
[0009] Accordingly, an embodiment of the invention provides a
centrifugal pump comprising a housing, an impeller, a stator, and a
central shaft. The housing comprises a fluid inlet, a fluid outlet,
and an accommodation chamber. The fluid inlet, fluid outlet, and
accommodation chamber are connected to and communicated with one
another. The impeller is disposed in the accommodation chamber and
comprises at least one venthole axially penetrating the impeller.
The stator is fixed to one side of the housing and corresponds to
the impeller, providing electromagnetic force required for rotation
of the impeller. The central shaft penetrates the center of the
impeller and axially extends to the stator.
[0010] The impeller further comprises a rotating portion and a
plurality of blades. The venthole axially penetrates the rotating
portion, and the blades are formed on a surface of the rotating
portion.
[0011] The housing further comprises a top cover and an outer
frame. The accommodation chamber is between the top cover and the
outer frame. The fluid inlet and fluid outlet are formed and extend
in the top cover. Fluid flows into the centrifugal pump via the
fluid inlet and out of the centrifugal pump via the fluid outlet
along the rotational direction of the impeller.
[0012] The outer frame surrounds the stator, preventing the fluid
from entering the drive member.
[0013] The housing further comprises a base opposite to the top
cover, and the stator is fixed to the base.
[0014] Accordingly, when the centrifugal pump operates, air therein
is expelled via the venthole, thereby decreasing pumping pressure
loss, air binding, noise, vibration, and air erosion.
[0015] Another embodiment of the invention provides a centrifugal
pump comprising a housing, an impeller, a stator, and a central
shaft. The housing comprises a fluid inlet, a fluid outlet, and an
accommodation chamber. The impeller is disposed in the
accommodation chamber. The stator is fixed to one side of the
housing and corresponds to the impeller, providing electromagnetic
force required for rotation of the impeller. The central shaft
penetrates the center of the impeller and axially extends to the
stator. The central shaft comprises a spiral groove on the surface
thereof. The spiral direction of the spiral groove corresponds to
the rotational direction of the impeller.
[0016] Accordingly, when the centrifugal pump operates, air therein
moves to the central shaft by compression of fluid and is expelled
along the spiral groove, thereby decreasing pumping pressure, air
binding, noise, vibration, and air erosion.
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 cross section of a conventional
centrifugal pump;
[0019] FIG. 2 is a schematic cross section of the centrifugal pump
of a first embodiment of the invention;
[0020] FIG. 3 is a schematic top view of the impeller of FIG. 2;
and
[0021] FIG. 4 is a schematic cross section of the centrifugal pump
of a second embodiment of the invention.
DETAILED DESCRIPTION
First Embodiment
[0022] Referring to FIG. 2, the centrifugal pump comprises a
housing 5, an impeller 6, a stator 7, and a central shaft 8. The
stator 7 is able to activate the impeller 6 rotating with the
central shaft 4.
[0023] The impeller 6, stator 7, and central shaft 8 are disposed
in the housing 5. The housing 5 comprises a top cover 50, an outer
frame 52, and a base 54. An accommodation chamber is formed between
the top cover 50 and the outer frame 52 for accommodating the
impeller 6. The top cover 50 comprises a fluid inlet 501 and a
fluid outlet 503. Fluid, such as water, flows into the centrifugal
pump via the fluid inlet 501 and out of the centrifugal pump via
the fluid outlet 503 along the rotational direction of the impeller
6. The fluid inlet 501, fluid outlet 503, and accommodation chamber
of the housing 5 are connected to and communicated with one
another. The base 54 is disposed opposite to the top cover 50. A
sealed chamber is formed between the base 54 and the outer frame
52, in which the stator 7 is disposed.
[0024] The impeller 6 comprises a rotating portion 60 and a
plurality of blades 61 disposed on the upper surface of the
rotating portion 60. A gap exists between the impeller 6 and the
top cover 50 and between the impeller 6 and the outer frame 52,
allowing the fluid to flow through. At least one venthole 62 is
axially formed to penetrate the rotating portion 60. As shown in
FIG. 3, a plurality of ventholes 62 is formed in the impeller 6,
preferably, uniformly distributed on the upper surface of the
rotating portion 60.
[0025] The stator 7 is disposed under the impeller 6 and comprises
a core 70 and a circuit board 71. The sealed chamber formed between
the base 54 and the outer frame 52 of the housing 5 accommodates
the core 70 and circuit board 71. The circuit board 71 is disposed
on the base 54 and the core 70 is disposed on an axial extending
portion of the base 54. The core 70 is electrically connected to
the circuit board 71 and corresponds to the rotating portion 60 of
the impeller 6, providing electromagnetic force to rotate the
impeller 6 when applied with electricity.
[0026] The central shaft 8 penetrates the center of the impeller 6
and extends to the center of the core 70 of the stator 7. The
impeller 6 rotates about the central shaft 8 when the core 70 is
applied with electricity.
[0027] When the centrifugal pump operates, the fluid flows to the
impeller 6 via the fluid inlet 501 and obtains kinetic energy by
rotation of the impeller 6. The fluid then flows to the fluid
outlet 503 by centrifugal force provided by the blades 61 of the
impeller 6. Additionally, air under the rotating portion 60 is
expelled via the ventholes 62 along the axial direction of the
impeller 6 such that pumping pressure loss, air binding, noise,
vibration, and air erosion are thus avoided.
Second Embodiment
[0028] Elements corresponding to those of the first embodiment
share the same reference numerals, and explanation thereof is
omitted for simplification of the description.
[0029] Referring to FIG. 4, the difference between this and the
first embodiments is modification of the vent structure.
Specifically, a spiral groove 80 is formed on the outer surface of
the central shaft 8. The spiral direction of the spiral groove 80
corresponds to the rotational direction of the impeller 6. When the
centrifugal pump operates, air under the rotating portion 60 moves
to the central shaft 8 by compression of the fluid and is rapidly
expelled along the spiral groove 80.
[0030] Structure, disposition, and function of other elements of
the centrifugal pump of this embodiment are the same as those of
the first embodiment, and explanation thereof is omitted for
simplicity.
[0031] In conclusion, the aforementioned venthole and spiral groove
can selectively be applied in a centrifugal pump to achieve the
removal of air. Moreover, the aforementioned venthole and spiral
groove can simultaneously be applied in the centrifugal pump,
further enhancing the removal of air under the rotating portion of
the impeller.
[0032] 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.
* * * * *