U.S. patent application number 11/026437 was filed with the patent office on 2006-01-19 for wet and dry pump.
This patent application is currently assigned to LG Electronics Inc.. Invention is credited to Jay-Ho Choi, Yo-Han Lee, Jun-Young Lim.
Application Number | 20060013712 11/026437 |
Document ID | / |
Family ID | 34941868 |
Filed Date | 2006-01-19 |
United States Patent
Application |
20060013712 |
Kind Code |
A1 |
Lee; Yo-Han ; et
al. |
January 19, 2006 |
Wet and dry pump
Abstract
Disclosed is a wet and dry pump, comprising: a housing having an
inlet and an outlet of fluid; an impeller rotatably set in the
housing; and a motor including a rotating shaft connected to the
impeller, a stator fixed to an inner circumferential surface of the
housing and having a damp-proof-processed winding coil therein, and
a rotor fixed to an outer circumference of the rotating shaft with
maintaining a certain gap with an inner circumference of the
stator. Therefore, it can be advantageous to improve
characteristics of power consumption and noise by making wet air or
liquid pass through a passage between the stator and the rotor.
Inventors: |
Lee; Yo-Han; (Seoul, KR)
; Choi; Jay-Ho; (Seoul, KR) ; Lim; Jun-Young;
(Incheon, KR) |
Correspondence
Address: |
GREENBLUM & BERNSTEIN, P.L.C.
1950 ROLAND CLARKE PLACE
RESTON
VA
20191
US
|
Assignee: |
LG Electronics Inc.
Seoul
KR
|
Family ID: |
34941868 |
Appl. No.: |
11/026437 |
Filed: |
January 4, 2005 |
Current U.S.
Class: |
417/423.7 ;
417/366; 417/423.3 |
Current CPC
Class: |
F04D 13/064 20130101;
F04D 31/00 20130101 |
Class at
Publication: |
417/423.7 ;
417/423.3; 417/366 |
International
Class: |
F04B 39/06 20060101
F04B039/06; F04B 39/02 20060101 F04B039/02; F04B 35/04 20060101
F04B035/04 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 13, 2004 |
KR |
54303/2004 |
Claims
1. A wet and dry pump, comprising: a housing having an inlet and an
outlet of fluid; an impeller rotatably set in the housing; and a
motor including a rotating shaft connected to the impeller, a
stator fixed to an inner circumferential surface of the housing and
having a damp-proof-processed winding coil therein, and a rotor
fixed to an outer circumference of the rotating shaft with
maintaining a certain gap with an inner circumference of the
stator.
2. The pump of claim 1, wherein the stator comprises: a plurality
of bobbins arranged as a ring shape and each bobbin having a coil
wound therein, wherein an entire outer portion of the each bobbin
is molded; and a plurality of conductors connected to the plurality
of bobbins, respectively, and exposed to the outside of the molding
portion at a certain interval along an inner circumference of the
stator.
3. The pump of claim 2, wherein the housing comprises: a
cylindrical impeller cover having the inlet at a central upper
portion thereof and in which an impeller is arranged; and a motor
cover to which the impeller cover is coupled, at which a plurality
of outlets are formed along an outer circumference thereof, and
which the stator is fixed to an inner circumference thereof.
4. The pump of claim 3, wherein a guide member for guiding fluid
sucked by the impeller toward the motor cover is installed between
the impeller cover and the motor cover.
5. The pump of claim 4, wherein the guide member has a flat-type
ring shape forming a curved surface toward the impeller.
6. The pump of claim 4, wherein the plurality of outlets are
respectively formed at upper and lower sides of the stator.
7. The pump of claim 3, wherein a cooling passage through which
fluid sucked by the impeller passes is formed between an outer
circumference of the stator and an inner circumference of the motor
cover.
8. The pump of claim 4, wherein the molding portion comprises a
protruded portion protruding on an outer circumference of the
molding portion to be fixed to an inner circumference of the motor
cover, and a recessed portion recessed in the outer circumference
of the molding portion to form the cooling passage with the inner
circumference of the motor cover.
9. The pump of claim 1, wherein the motor is installed on a passage
of the fluid flowed from the inlet to the outlet.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a wet and dry pump, and
particularly, to a wet and dry pump capable of making wet air or
liquid pass through a space between a stator and a rotor by
processing a motor to be damp-proof.
[0003] 2. Description of the Conventional Art
[0004] As shown in FIGS. 1 and 2, a conventional wet and dry pump
includes: a housing 110 provided with a cylindrical impeller cover
111 and a cylindrical motor cover 112; an impeller 120 rotatably
installed in the impeller cover 112; a motor 140 installed in the
motor cover 112 and connected to the impeller 120 and a rotating
shaft 130, for providing a driving force to rotate the impeller
120; and a cooling fan 170 connected to the rotating shaft 130 and
rotated by a rotation of the rotating shaft 130 and thereby sucking
a cooling air into the motor cover 102 to discharge it.
[0005] An inlet 113 for sucking fluid by an operation of the
impeller 120 is formed at a central upper portion of the impeller
cover 111, and a plurality of outlets 114 for discharging the fluid
flowed in the impeller cover 111 is formed at a circumference of
the impeller cover 111.
[0006] A suction opening 115 for sucking cooling air by an
operation of the cooling fan 170 is formed at a central lower
portion of the motor cover 112, and a plurality of discharge
openings 116 for discharging the air having performed a cooling
operation to the outside are formed at a circumference of the motor
cover 112.
[0007] The motor 140 includes: a stator 141 of a ring shape fixed
at an inner circumferential surface of the motor cover 112; and a
cylindrical rotor 142 fixed at an outer circumference of the
rotating shaft 130, maintaining a certain gap with an inner
circumferential surface of the stator 141. According to this, the
air sucked by the cooling fan 170 discharges to the outside a heat
generated from the motor 140 when the air passes through the gap
between the stator 141 and the rotor 142.
[0008] A shielding wall 117 is installed between the impeller cover
111 and the motor cover 112. As a result, the fluid sucked by the
impeller 120 can not be flowed in the motor cover 112 and the
cooling air sucked by the cooling fan 170 can not be flowed in the
impeller cover 111 as well.
[0009] According to the aforementioned construction, when the motor
140 is operated, the impeller 120 is rotated by the rotation of the
rotating shaft 130. As a result, fluid is flowed in the impeller
cover 111 through the inlet 113 of the impeller cover 111 and
discharged to the outside through the outlet 114.
[0010] Additionally, once the cooling fan 170 is rotated by the
rotation of the rotating shaft 130, the external air is sucked in
the motor cover 112 through the suction opening 115 and cools the
motor 140 while passing through the gap between the stator 141 and
the rotor 142, thereafter being discharged to the outside through
the discharge opening 116.
[0011] In the aforementioned conventional wet and dry pump, since
the shielding wall 117 for shielding a space between an inner space
of the impeller cover 111 and an inner space of the motor cover 112
is installed therein, the fluid flowed in the impeller cover 111 is
prevented from being flowed toward the motor 140 and thereby the
conventional wet and dry pump can pump wet air or liquid.
[0012] However, because the conventional wet and dry pump should
have the cooling fan 170 for cooling the motor 140, power loss of
approximately 60.about.70W is occurred, and noise of approximately
2.about.3 dB is disadvantageously increased thereby.
SUMMARY OF THE INVENTION
[0013] Therefore, an object of the present invention is to provide
a wet and dry pump capable of improving a cooling efficiency of a
motor by processing it to be damp-proof and thus by making wet air
or liquid pass through a space between a stator and a rotor, and
capable of improving characteristics of power consumption and noise
by removing a separate cooling fan for cooling the motor.
[0014] To achieve these and other advantages and in accordance with
the purpose of the present invention, as embodied and broadly
described herein, there is provided a wet and dry pump, comprising:
a housing having an inlet and an outlet of fluid; an impeller
rotatably disposed in the housing; and a motor including a rotating
shaft connected to the impeller, a stator fixed to an inner
circumferential surface of the housing and having a
damp-proof-processed winding coil therein, and a rotor fixed to an
outer circumference of the rotating shaft with maintaining a
certain gap with an inner circumference of the stator.
[0015] The foregoing and other objects, features, aspects and
advantages of the present invention will become more apparent from
the following detailed description of the present invention when
taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The accompanying drawings, which are included to provide a
further understanding 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.
[0017] In the drawings:
[0018] FIG. 1 is a front view showing a conventional wet and dry
pump;
[0019] FIG. 2 is a longitudinal sectional view showing the wet and
dry pump shown in FIG. 1;
[0020] FIG. 3 is a front view showing a wet and dry pump according
to the present invention;
[0021] FIG. 4 is a longitudinal sectional view showing the wet and
dry pump shown in FIG. 3;
[0022] FIG. 5 is a perspective view showing a partially cut stator
in FIG. 3;
[0023] FIG. 6 is a graph showing respective power consumption of
the wet and dry pump according to the present invention and that of
the conventional wet and dry pump, respectively in comparison
therewith; and
[0024] FIG. 7 is a graph showing respective operation noise of the
wet and dry pump according to the present invention and that of the
conventional wet and dry pump in comparison therewith.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0025] Reference will now be made in detail to the preferred
embodiments of the present invention, examples of which are
illustrated in the accompanying drawings.
[0026] Referring to FIGS. 3 and 4, a wet and dry pump according to
the present invention is comprised of: a housing 10 provided with a
cylindrical impeller cover 11 having an inlet 13 at a central upper
portion thereof and a cylindrical motor cover 12 having a plurality
of outlets 14 and 15 along an outer circumference thereof; an
impeller 10 rotatably installed in the impeller cover 11; and a
motor 40 installed in the motor cover 12 and connected to the
impeller 20 and a rotating shaft 30, for providing a driving force
to rotate the impeller 20.
[0027] The motor 40 includes: a stator 41 of a ring shape fixed to
an inner circumferential surface of the motor cover 12; and a rotor
42 fixed to an outer circumference of the rotating shaft 30,
maintaining a certain gap 50 with an inner circumference of the
stator 41.
[0028] A brushless motor, particularly, a switched reluctance (SRM)
motor is preferably applied as the motor 40, and according to
characteristics of the brushless motor, the rotor 42 has a
characteristic of damp-proofing.
[0029] As can be seen from FIG. 5, the stator 41 is comprised of: a
plurality of bobbins 46 arranged as a ring shape and the each
bobbin having a coil 45 which is wound therein, wherein entire
outer portion of the each bobbin is molded (43) with a material
such as a synthetic resin; and a plurality of conductors 47
connected to the plurality of bobbins 46, respectively, and exposed
to the outside of the molding portion 43 at a certain interval
along an inner circumference of the stator 41. As a result, even
although wet air or liquid passes through a space between the
stator 41 and the rotor 42, the coils 45 in the molding portion 43
are shielded from the wet air or the liquid.
[0030] The molding portion 43 has a plurality of protruded portions
48 and recessed portions 49 along an outer circumference thereof in
order to form a cooling passage 51 through which fluid sucked by
the impeller 10 passes for cooling the motor 40. Namely, the
protruded portion 48 of the molding portion 43 is fixed to an inner
circumferential surface of the motor cover 12 via welding or other
engaging means, thus the cooling passage 51 is formed between the
recessed portion 49 of the molding portion 43 and the inner
circumferential surface of the motor cover 12.
[0031] The plurality of outlets 14 and 15 formed at the motor cover
12 are comprised of: a first outlet 14 formed at an upper side of
the stator 41, for first discharging the fluid flowed in from the
impeller cover 11; and a second outlet 15 formed at a lower side of
the stator 41, for passing fluid, which is not discharged to the
outside through the first outlet 14, through the space between the
stator 41 and the rotor 42 and thereafter for discharging to the
outside.
[0032] The rotating shaft 30 can be protruded to the outside of the
motor cover 12. In this case, a bearing 17 is preferably installed
between the rotating shaft 30 and the motor cover 12.
[0033] Preferably, a guide member 22 for guiding the fluid flowed
in by the impeller 20 toward the motor cover 12 is installed
between the impeller cover 11 and the motor cover 12. In the
embodiment of the present invention, the guide member 22 has a flat
type of ring shape forming a curved surface toward the impeller
20.
[0034] Hereinafter, an operation of the wet and dry pump according
to the present invention will be described.
[0035] First, once the rotor 42 is rotated by an electromagnetic
interaction between the stator 41 and the rotor 42, the impeller 20
connected to the rotor 42 and the rotating shaft 30 is rotated and
thereby external fluid is flowed in through the inlet 13 of the
impeller cover 11.
[0036] The fluid flowed in the impeller cover 11 is guided to the
guide member 22 to be flowed in the motor cover 12. A part of the
fluid flowed in the motor cover 12 is discharged to the outside
through the first outlet 14, and non-discharged fluid passes
through the cooling passage 50 between the stator 41 and the rotor
42 as well as the cooling passage 51 between the inner
circumference of the motor cover 12 and the outer circumference of
the stator 41 in order to cool the motor 40. Furthermore, the fluid
having performed the cooling operation for the motor 40 is
discharged to the outside through the second outlet 15.
[0037] Hereinafter, effect of the wet and dry pump in accordance
with the present invention will be explained with reference to
FIGS. 6 and 7.
[0038] FIG. 6 is a graph showing a variation of power consumption
based on a diameter of the inlet 13, namely, variation of suction
capacity of the pump according to the present invention with the
conventional pump, respectively. As shown in FIG. 6, it can be
noticed that the pump according to the present invention consumes
power less than the conventional pump does because the cooling fan
for cooling the motor has been removed.
[0039] FIG. 7 is a graph showing noise measured in the conventional
pump and the pump according to the present invention, respectively.
As shown in FIG. 7, it can be noticed that the pump according to
the present invention is improved characteristics of noise in
comparison with the conventional pump because the cooling fan for
cooling the motor has been removed.
[0040] As stated above, the wet and dry pump according to the
present invention can advantageously improve a cooling efficiency
of the motor by processing it to be damp-proof and then making wet
air or liquid pass through a passage between the stator and the
rotor.
[0041] Furthermore, the wet and dry pump according to the present
invention can efficiently improve characteristics of power
consumption and noise by removing the cooling fan for cooling the
motor.
[0042] As the present invention may be embodied in several forms
without departing from the spirit or essential characteristics
thereof, it should also be understood that the above-described
embodiments are not limited by any of the details of the foregoing
description, unless otherwise specified, but rather should be
construed broadly within its spirit and scope as defined in the
appended claims, and therefore all changes and modifications that
fall within the metes and bounds of the claims, or equivalence of
such metes and bounds are therefore intended to be embraced by the
appended claims.
* * * * *