U.S. patent number 3,752,603 [Application Number 05/206,256] was granted by the patent office on 1973-08-14 for motor driven centrifugal pump.
This patent grant is currently assigned to Zenith Manufacturing Inc.. Invention is credited to Robert E. Bunch.
United States Patent |
3,752,603 |
Bunch |
August 14, 1973 |
MOTOR DRIVEN CENTRIFUGAL PUMP
Abstract
A motor driven centrifugal pump characterized by a unique
housing, motor and impeller which provide the pump with a simple
low-cost construction, compact size, quiet operation and other
features that adapt the pump for use in a trailer, camper or the
like for pumping water from a storage tank to a tap or other
outlet.
Inventors: |
Bunch; Robert E. (LaVerne,
CA) |
Assignee: |
Zenith Manufacturing Inc. (El
Monte, CA)
|
Family
ID: |
22765601 |
Appl.
No.: |
05/206,256 |
Filed: |
December 9, 1971 |
Current U.S.
Class: |
417/423.14;
415/200; 415/217.1 |
Current CPC
Class: |
H02K
7/14 (20130101); F04D 13/06 (20130101); F04D
29/2233 (20130101) |
Current International
Class: |
F04D
29/18 (20060101); H02K 7/14 (20060101); F04D
29/22 (20060101); F04D 13/06 (20060101); F04b
017/00 () |
Field of
Search: |
;417/424
;415/214,201,200 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Husar; C. J.
Claims
What is claimed as new in support of Letters Patent is:
1. A pump comprising:
a generally cylindrical housing having a coaxial cylindrical pump
chamber in one end, an inlet nipple extending coaxially from said
housing end and containing an inlet passage opening to said
chamber, means on said nipple for securing said nipple and thereby
the entire pump to a pump mount, an outlet nipple extending
tangentially from said housing adjacent said end and containing an
outlet passage opening tangentially to said chamber, and a motor
chamber in the opposite end of said housing,
said housing comprising a circular wall member between and forming
a common boundry wall of said chambers and having circular flanges
about its edge projecting axially beyond opposite sides of the wall
member, a first generally cup-shaped end portion having a
cylindrical wall seating against and sealed to one side of said
wall member with the adjacent flange of the wall member overlapping
the cylindrical wall of said end portion to form said pump chamber,
said inlet nipple and outlet nipple extending from said cup
portion, and a second generally cup-shaped end portion having a
cylindrical wall seating against and sealed to the opposite side of
said wall member with the adjacent flange of said wall member
overlapping the cylindrical wall of said second end portion to form
said motor chamber,
a centrifugal pump impeller rotatably mounted in said chamber to
turn about the axis of the chamber, and
a motor in said motor chamber having a shaft connected to said
impeller for driving said impeller in rotation.
2. A pump according to claim 1 wherein:
said motor has electrical terminals projecting laterally through
aligned openings in the cylindrical wall of said second end portion
and the adjacent flange of said wall member.
3. A pump according to claim 1 wherein:
said inlet nipple securing means comprise external threads.
4. A pump according to claim 1 wherein:
said inlet nipple securing means comprise external circumferential
ribs.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to pumps and more particularly to
a novel centrifugal pump.
2. Discussion of the Prior Art
As will appear from the ensuing description, the centrifugal pump
of the invention is capable of a wide variety of uses. The pump is
intended primarily for use as a water pump in recreational vehicles
such as campers, trailers, and the like, however, and will be
described in connection with this particular use.
Campers, trailers and other recreational vehicles are equipped with
one or more taps and, in some cases, other water outlets which
receive water from a storage tank on the vehicle. Water is
transported from the tank to the outlets by hand operated or motor
driven pumps. The motor driven pumps are obviously superior to hand
operated pumps. The existing motor driven pumps for this purpose,
however, have certain deficiencies which this invention overcomes.
Foremost among these are costly construction, large size, and noisy
operation.
SUMMARY OF THE INVENTION
The improved pump of this invention is a centrifugal pump having a
housing containing a motor and centrifugal impeller. The housing
may be conveniently injection molded from plastic and has a unique
three-part construction. This housing has a central circular wall
member with axially projecting annular flanges about its edges and
two generally cup-shaped end portions. One end portion is sealed to
one side of the wall member in overlapping telescoping relation to
its adjacent flange and forms with the wall member a pump chamber
containing the centrifugal impeller. Extending axially from the end
portion is an inlet nipple which is externally threaded or
otherwise adapted for connection to the water tank. An outlet
nipple extends tangentially from the end portion for connection to
a water pipe leading to the trailer or camper water outlets. The
opposite end portion of the housing is sealed to the other side of
the wall member in overlapping telescoping relation to its adjacent
flange and contains the pump motor.
Projecting laterally from the end of the pump motor adjacent the
wall member are a pair of electrical terminals. These terminals
extend externally of the pump housing through slots in the end
portion of the housing containing the motor.
The pump impeller may also be conveniently injection molded from
plastic and has a number of radial vanes. The edges of these vanes
are disposed in fluid sealing relation to the wall of the pumping
chamber so that rotation of the impeller by the pump motor impels
water from the chamber through the outlet. Each vane inclines
forwardly in the direction of rotation toward the inlet end of the
chamber in such a way as to enhance the centrifugal pumping action
of the impeller.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a pump according to the
invention;
FIG. 2 is an enlarged section taken on line 2--2 in FIG. 1;
FIG. 3 is an enlarged section taken on line 3--3 in FIG. 1; and
FIG. 4 illustrates a modified inlet nipple for the pump.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The illustrated centrifugal pump 10 has a housing 12 containing a
motor 14 and a centrifugal impeller 16. Housing 12 has three parts
18, 20 and 22 which may be conveniently injection molded from
plastic.
Housing part 18 is a circular wall member with axially projecting
annular flanges 24, 26 about its edges. Housing part 20 is a
generally cup-shaped end portion having a cylindrical wall 28 and
an end wall 30. The open end of the end portion 20 seats against
one side of the wall member 18 in overlapping telescoping relation
with its flange 24. The end portion is adhesively bonded or
otherwise sealed to the wall member to form with the member a
circular pump chamber 32.
Extending axially from the end wall 30 is an inlet nipple 34
containing a water passage 36 opening to the pump chamber 32.
Nipple 34 is externally threaded for connection to a pump mount,
such as the wall of a trailer or camper water tank with the inlet
passage in communication with the tank interior. FIG. 4 illustrates
an alternative inlet nipple configuration 38 having circumferential
ribs and grooves and adapted to be adhesively bonded to a pump
mount. An outlet nipple 40 extends tangentially from the housing
end portion 20 and contains an outlet passage 42 opening
tangentially to the pump chamber 32.
Housing part 22 is a cup-shaped end portion which seats against the
opposite side of the wall member 18 in overlapping telescoping
relation to its flange 26. The end portion is adhesively bonded or
otherwise secured to the wall member and contains the pump motor
14. The motor shaft 44 extends through the wall member 18 and is
sealed to the member in any convenient manner. Extending laterally
from the end of the motor 14 adjacent the wall member 18 are
electrical terminals 46. These terminals extend externally of the
housing through slots 48 in the end portion 22 for connection to an
electrical power source. A variety of motors may be used in the
pump. The preferred motor, however, is a 5,000 r.p.m. 12 V., 11/2
amp motor of Rowe Industries, New York.
The pump impeller 16 may be conveniently molded from plastic and is
rigidly attached to the motor shaft 44 within the pump chamber 32.
The impeller has radial vanes 50 whose edges are disposed in fluid
sealing relation to the pump chamber walls. As shown in FIGS. 2 and
3, the impeller vanes incline forwardly in the direction of
impeller rotation.
When the impeller 16 is driven by the motor 14, the impeller vanes
50 centrifugally impel water from the pump chamber 32 through the
outlet passage 42 to produce a centrifugal pumping action. The
inclination of the vanes enhances this pumping action.
* * * * *