Immersed vertical pump with reduced thrust loading

Details Immersed vertical pump with reduced thrust loading Immersed vertical pump with reduced thrust loading

1999-02-04

2001-01-09

Freay, Charles G. (Department: 3746)

Pumps

Motor driven

Electric or magnetic motor

C417S423140

Reexamination Certificate

active

06171080

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an immersed pump having a suction port directly immersed in a liquid for operation.
PRIOR ART
Immersed pumps having a suction port immersed in a liquid so as to draw in the liquid have been widely known. As shown in
FIG. 4
, conventional immersed pumps are generally configured so that an impeller
26
mounted at the tip of a rotating shaft
25
is driven and rotated by a motor
21
mounted at the upper end of a body frame
20
, in order to draw in a liquid from a suction port
23
provided at the lower end of a housing
22
at the lower end of the body frame
20
. The liquid is then pressurized and discharged sideward from a ejection port
24
at the upper end of the frame through a channel in the side of the body frame
20
.
Since an immersed pump of this type force-feeds a liquid upward, the liquid may leak to the frame
20
through the circumference of the motor's rotating shaft
25
. Thus, a shaft sealing apparatus
27
such as a mechanical seal must be used to support and seal the rotating shaft
25
to prevent leakage. Accordingly, maintenance or replacement of the shaft sealing apparatus
27
, which is associated with usage frequency, can be so cumbersome that the lifetime expectancy of the pump decreases.
In addition, since the liquid drawn in from the center of the lower end of the housing
22
, pressurized, and ejected sideward from the body frame
20
, a lateral force may be imparted to the rotating shaft
25
to vibrate and deform it, thereby vibrating the entire pump and creating loud noise.
Furthermore, since the thrust of the rotating shaft
25
effected by the rotation of the impeller
26
acts in the same direction as the weight of the motor
21
, a large force may be applied to each section of the pump, particularly a bearing which supports the rotating shaft
25
mounted in the body frame
20
, resulting in defects.
DISCLOSURE OF THE INVENTION
It is a technical object of this invention to improve the above immersed pump, by altering its design in such a way that the pump transfers a liquid downward, thereby eliminating the need to seal the shaft with a shaft sealing apparatus—and thus the need for maintenance/replacement associated with such sealing—and reducing the effect on individual pump sections of a) the thrust of the rotating shaft effected by the rotation of the impeller and b) the weight of the motor acting in the same direction. This improved design should provide an immersed pump that can reduce the incidence of defects.
It is another technical object to provide an immersed pump that precludes a lateral force caused by the ejected liquid from being imparted to the rotating shaft, in order to prevent vibration and/or deformation of the rotating shaft as well as vibrations affecting the entire pump.
To achieve these objects, this invention provides an immersed pump comprising a body frame, a motor mounted at the upper end of the body frame, a pump housing mounted at the lower end of the body frame, a rotating shaft extending from the motor through the inside of the body frame to the housing, and at least one impeller attached to the rotating shaft in the housing, the impeller being driven and rotated by the motor to draw a liquid in a tank from a suction port into the housing and eject it from an ejection port, characterized in that the suction port is provided above the impeller, and in that the ejection port is provided at the lower end of the housing.
Since the suction port through which a liquid is drawn in is provided above the impeller installation position so that the liquid drawn into the housing is force-fed downward, use of a shaft sealing apparatus such as a conventional mechanical seal can be omitted to eliminate the need for cumbersome maintenance and replacement of the apparatus.
In addition, the upward thrust of the rotating shaft effected by the rotation of the impeller offsets the downward weight of the motor, thus reducing the force imparted to each section of the pump. Consequently, it is possible to prevent defects that may occur in conventional pumps in which the motor's thrust and gravitational force act in the same direction.
Furthermore, the liquid drawn into the housing is force-fed downward therein, thereby precluding a lateral force from being applied to the rotating shaft despite the ejection of the pumped liquid. This configuration further prevents the rotating shaft from being vibrated or deformed and avoids vibration of the entire pump that result in noise.
According to the immersed pump described in this invention, the ejection port is provided on an extension of the axis of the rotating shaft, and a joint that is directly joined with an ejection hole provided at the bottom of the tank is mounted in the ejection port.
Moreover, according to this invention, the housing is formed by coupling a plurality of short, cylinder-shaped housing members together in the vertical direction, and an impeller is provided in each of at least some of the housing members. In this case, the impellers are provided in some of the lower housing members while a suction port is provided on the outer circumference of each of at least some of the remaining upper housing members.
In addition, desirably, the plurality of housing members are detachably coupled together, and each of the impellers is remorably attached to the rotating shaft.


REFERENCES:
patent: 2166758 (1939-06-01), Franck
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patent: 2478941 (1949-08-01), Piccardo
patent: 2997957 (1961-08-01), Hall
patent: 3723019 (1973-03-01), Berman
patent: 4930996 (1990-06-01), Jensen et al.
patent: 4978281 (1990-12-01), Conger
patent: 5051071 (1991-09-01), Haentjens
patent: 5407323 (1995-04-01), Gay et al.
patent: 5549450 (1996-08-01), Mann et al.
patent: 558 040 (1943-12-01), None
patent: 599 988 (1948-03-01), None
patent: 614 442 (1948-12-01), None
patent: 1 373 039 (1974-11-01), None
patent: 1 428 533 (1976-03-01), None
patent: 2 248 406 (1992-04-01), None

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