Pump structure

Details Pump structure Pump structure

2000-07-24

2001-11-27

Freay, Charles G. (Department: 3746)

Pumps

Motor driven

Electric or magnetic motor

C417S365000, C415S172100

Reexamination Certificate

active

06322335

ABSTRACT:

FIELD OF THE INVENTION
The present invention generally relates to a pump, and in particular to a pump structure comprising a movable, dynamic and auto-adjustable thrust ring assembly for extending service life of the pump.
BACKGROUND OF THE INVENTION
A conventional pump, as shown in
FIG. 5
of the attached drawings, comprises a front casing
100
attached to a rear casing
200
to define an interior space
101
for accommodating an impeller
300
. The impeller
300
is supported by a shaft and driven by a motor to rotate in the interior space
101
. A trust
500
is fixed in an inside surface of the front casing
100
. A wearing ring
400
is attached to the impeller
300
for contactingly engaging the thrust ring
500
. Since there is always essential clearance between the shaft and bushing, the rotation of the impeller
300
is unavoidably an eccentric motion. This causes a non-uniform engagement between the thrust ring
500
and the wearing ring
400
, leading to breakage of lubrication film therebetween and eventually shorting the service life time of wearing ring
400
.
Thus, it is desired to provide a pump structure for overcoming the problems.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a pump structure wherein the wearing of a wearing ring of an impeller is reduced hereby extending service life thereof.
Another object of the present invention is to provide a pump structure comprising an axially movable buffer, the orientation of which being capable to vary with the wearing ring of the impeller, while an eccentric motion occurs thus forming a face-to-face touch between the rings,by the way, the buffer also used to reduce the impact force acted by the impeller onto the thrust ring.
In accordance with the present invention, the pump of the present invention combining a front casing and a rear casing for defining a space therebetween. An end of the shaft extends into the space with an impeller is supported by a bushing which makes the impeller is rotatable in the space. A wearing ring is attached to a front side of the impeller. The front casing defines a bore in which a buffer is received so as to be axially movable with respect thereto. A thrust ring is attached to the buffer for contactingly engaging the wearing ring whereby when the impeller rotates, the axial movement of the buffer facilitates maintaining a fluid film between the thrust ring and the wearing ring. An O-ring is mounted to the buffer for providing a buffering function between the buffer and the front casing. This reduces the impact force.


REFERENCES:
patent: 4063846 (1977-12-01), Eagle
patent: 5184945 (1993-02-01), Chi-Wei
patent: 6200090 (2001-03-01), Chien et al.
patent: 6234748 (2001-05-01), Brown et al.
patent: 6264440 (2001-07-01), Klein et al.
patent: 8-303388 (1996-11-01), None

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