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US 4,784,587 AGranted
Pump apparatus
AssigneeNippondenso Co., Ltd.
InventorsToshihiro Takei, Yoshiyuki Hattori, Yutaka Kawashima, Tetuya Izumi, Yoshifumi Ina, Takeshi Matsuda
Life of this patent
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Abstract
A pump apparatus comprises a pump housing, an impeller having a plurality of radial grooves rotatably disposed within the pump housing, first and second fluid passages each defined by the impeller and the pump housing at both sides of the impeller, a motor having an output shaft for driving the impeller, a first radial clearance between the impeller and the output shaft of the motor, and a second radial clearance between an outer peripheral surface of the impeller and the pump housing, which is smaller than the first clearance.
Claims17
A pump apparatus comprising:
- a pump housing defined by a hollow housing body and two end walls secured to said housing body;
- a single impeller rotatably disposed in said pump housing, said impeller being enclosed at an outer periphery thereof of an inner periphery of said housing body in a substantially liquid-tight manner, whereby said impeller is journaled at said outer periphery thereof in said inner periphery of said housing body;
- a first fluid passage for primarily pressurized fluid defined by said impeller and said pump housing at one side of said impeller, said fist fluid passage including an inlet and an outlet;
- a second fluid passage for secondarily pressurized fluid defined by said impeller and said pump housing at the other side of said impeller, said second fluid passage including an inlet and an outlet;
- a plurality of radial grooves formed on a peripheral portion of each end surface of said impeller, each of which radially extends to an outer peripheral surface of said impeller;
- a motor including an output shaft for rotating and carrying at an end portion thereof said impeller;
- a first radial clearance provided between said carrying end portion of said output shaft of said motor and said impeller;
- and
- a second radial clearance provided between said outer peripheral surface of said impeller and an inner periphery of said housing body for rotation of said impeller, and said second radial clearance being smaller than said first clearance, whereby a radial movement of said impeller is restricted.
6 more elements
A pump apparatus comprising:
- a pump housing defined by a hollow housing body and two end walls secured to said housing body;
- a single impeller rotatably disposed in said pump housing, said impeller being enclosed at an outer periphery thereof by an inner periphery of said housing body in a substantially liquid-tight manner, whereby said impeller is journaled at said outer periphery thereof in said inner periphery of said housing body;
- a first fluid passage for primarily pressurized fluid defined by said impeller and said pump housing at one side of said impeller, said first fluid passage including an inlet and an outlet;
- a second fluid passage for secondarily pressurized fluid defined by said impeller and said pump housing at the other side of said impeller, said second fluid passage including an inlet and an outlet;
- a plurality of radial grooves formed on a portion of each end surface of said impeller;
- a motor including an output shaft for rotating and carrying at an end portion thereof said impeller;
- a first intermediate chamber defined by said impeller and the end wall facing said first fluid passage;
- a second intermediate chamber defined by said impeller and the end wall facing said second fluid passage;
- a projection area of said second intermediate chamber projected on said impeller being smaller than that of said first intermediate chamber;
- and
- communication means for communicating said both intermediate chambers to the outlet of said second fluid passage.
8 more elements
A pump apparatus comprising;
- a pump housing defined by a hollow housing body and two end walls secured to said housing body;
- an impeller rotatably disposed in said pump housing;
- a first fluid passage for primarily pressurized fluid defined by said impeller and said pump housing at one side of said impeller, said first fluid passage having a generally annular shape and partially interrupted by a wall portion projecting radially inwardly from said pump housing, said first fluid passage including an inlet and an outlet;
- a second fluid passage for secondarily pressurized fluid defined by said impeller and said pump housing at the other side of said impeller, said second fluid passage having a generally annular shape and partially interrupted by a wall portion projecting radially inwardly from said pump housing, said second fluid passage including an inlet which is circumferentially spaced by about 180 degrees from the inlet of said first fluid passage, and an outlet which is circumferentially spaced by about 180 degrees from the outlet of said first fluid passage;
- a plurality of radial grooves formed on a portion of each end surface of said impeller;
- a motor including an output shaft for rotating and carrying at an end portion thereof said impeller;
- and
- communicating means for communicating the outlet of said first fluid passage with the inlet of said second fluid passage, said communicating means including an axial through hole formed in a center portion of said impeller, a first connecting passage section for connecting the outlet of said first fluid passage with said axial through hole, and a second connecting passage section for connecting the inlet of said second fluid passage with said axial through hole
5 more elements
Dependencies are inferred from the claim text.