Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
1998-08-17
2001-01-16
Kamen, Noah P. (Department: 3747)
Pumps
Motor driven
Electric or magnetic motor
C417S423140, C417S423900
Reexamination Certificate
active
06174146
ABSTRACT:
This invention relates to an electric bilge pump assembly for use in collecting liquid at the bottom of a vessel, a container, a gulley or like structure for holding liquid or in which liquid can gather. The pump is of the centrifugal type having an impeller mounted on the end of a shaft to be driven by an electric motor, the impeller being housed in a chamber having an axial inlet and a tangential outlet. The pump is for integration into a liquid conveying system for liquid disposal or further processing.
Accordingly, the present invention is an electric bilge pump assembly formed of three elongate parts in axial alignment, the assembly being for fixing to a surface in a horizontal attitude or substantially so, the assembly comprising as a first part an electric motor with an output shaft carrying at its distal end an impeller, as a second part a casing having a tubular portion in which is defined a chamber with an axial inlet and a tangential outlet with the impeller being positioned in the chamber, the casing having means for surface securement, and as a third part an inlet housing for fitment over the axial inlet of the casing, the housing having an open arcuate side over which a filter grid is attached.
Preferably, the electric motor is enclosed in a cylindrical jacket whose axis is aligned with the shaft and the axis of the tubular portion of the casing. The jacket preferably has an integral double skin cylindrical outer wall to provide an internal passageway between the skins and into which passageway liquid in the casing can flow to cool the motor.
Preferably, also, the casing has two opposed ends, one in which the axial inlet is provided and the other being open and around which a shroud outwardly extends. The shroud desirably has a plurality of open-ended slots provided at the transition between the tubular portion and itself and into which slots corresponding lugs, provided on the jacket manually are pushed and rotated for the motor to be thereby held in position. At the outer edge of the outer skin of the jacket, an O-ring seal is desirably provided whereby with the lugs fully located in their respective slots, the O-ring is compressed and distorted to provide a liquidtight seal. The shroud is preferably of rectangular shape in end elevation of the casing and two adjoining walls thereof are beneficially extended and provided with apertures through which fastenings can be screwed or bolted into a surface, the wall extensions and apertures serving as the means for surface-securement.
Preferably further, the inlet housing has a body having an upright wall in which an outlet is provided having a projecting spigot surround, the outer circumferential surface of which has a channel providing a seat for an O-ring seal. The end of the casing having the axial inlet is desirably provided with an annular socket formed by an outer peripheral flange and an inner peripheral surround extending from around the axial inlet, the space therebetween being entered by the spigot surround. The outer edge of the outer peripheral flange is beneficially tapered from outside to inside to provide a ramp to assist in the compression of the O-ring seal to provide a liquid tight joint between the casing and inlet housing. The fitment between spigot of the inlet housing with O-ring seal and the socket of the casing, preferably allows the facility to manually adjust the attitude of the filter grid of the housing relative to the surface to which the assembly is attached. The upright wall is, in inner end view, of sectoral shape and the front outer end slopes downwardly from adjacent to the top of the upright wall to meet and partially serve to define a bottom open arcuate side. An air bleed valve preferably is provided in the top side between the top of the upright wall and front outer end.
A tubular extension module of the jacket of the motor is preferably provided, the tubular extension being secured to the jacket by a locking ring and sealed internally with an O-ring. Further, for an automatic version of the pump assembly, a water level detector is preferably provided and housed in the extension. The electric motor beneficially has electric wires extending from the motor for integration into an electric circuit, the wires passing through the tubular extension module along an axial path or substantially so to exit therefrom through an axial collar with a liquidproof seal being provided between wires and collar. The collar has desirably two diametrically-extending wing gussets between itself and the end wall of the tubular extension module to give it support and to aid in disassembly. Two water-level sensors are preferably provided in a spaced relationship in the end wall of the tubular extension module to be located, in use, above the wing gussets, one above each wing gusset.
REFERENCES:
patent: 3717420 (1973-02-01), Rachocki
patent: 4013383 (1977-03-01), Rule
patent: 4645426 (1987-02-01), Hartley et al.
patent: 5833437 (1998-11-01), Kurth et al.
Edgerley David
Eves Alastair
Lacy Graham
Rehill Norman
Gimie Mahmoud M.
Greigg Edwin E.
Greigg Ronald E.
Kamen Noah P.
Munster Simms Engineering Limited
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