초록 ▼

An expanded foam material surrounds a relatively thin, metallic motor casing and forms a housing which supports the motor while providing a seal to preclude leakage of liquids into the motor casing and to prevent discharge of dielectric oil from the interior of the motor casing. During manufacture o

An expanded foam material surrounds a relatively thin, metallic motor casing and forms a housing which supports the motor while providing a seal to preclude leakage of liquids into the motor casing and to prevent discharge of dielectric oil from the interior of the motor casing. During manufacture of the pump, the casing is placed within a mold and a portion of the mold structure complementally and firmly engages four radially spaced regions of the generally cylindrical motor casing. Next, a quantity of the initially pourable foam material is introduced into the space between the mold and the casing, and the material self-expands to a solidified, cured condition in firm, surrounding engagement with the motor casing. The mold structure engaging the four regions of the casing consequently causes four radially spaced openings or windows to be formed which extend through the cured housing and expose the associated regions of the casing to the atmosphere, so that dissipation of heat from the motor is facilitated during operation of the pump. Curing of the foam material occurs at a relatively low temperature and pressure so that the housing may be molded around the casing in direct contact with the same without damage to the internal motor components.

대표청구항 ▼

A submersible pump comprising: a hollow metallic casing including a continuous metallic sidewall, a metallic top wall and a metallic bottom wall cooperating to define an enclosed internal chamber; an electric motor received within said chamber and having a rotatable armature shaft projecting through

A submersible pump comprising: a hollow metallic casing including a continuous metallic sidewall, a metallic top wall and a metallic bottom wall cooperating to define an enclosed internal chamber; an electric motor received within said chamber and having a rotatable armature shaft projecting through said bottom wall; an impeller fixed to said armature shaft below said bottom wall of the casing for rotation with the shaft when electrical power is supplied to the motor; and a microcellular, expanded foam housing of initially flowable, cured synthetic resinous material around the exterior only of said casing in surrounding relationship therewith. said housing comprising an integral body of said material adhered tightly to said sidewall and said top wall in firm, rigid, face-to-face, contacting engagement therewith, said casing extending substantially around the periphery of said motor and being normally substantially free of openings for generally precluding contact of said material with said motor, said housing including a portion extending downwardly beyond said bottom wall and configured to present a volute cavity which receives said impeller, a fluid inlet leading into said cavity and a fluid discharge passage leading out of said cavity.