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US 5,842,837 AGranted
Tandem pump apparatus
AssigneeAisin Seiki Kabushiki Kaisha
InventorsHideki Nakayoshi, Naoki Oogushi
Life of this patent
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Abstract
A tandem pump apparatus is featured having a main suction passage connected to a fluid source. The main suction passage branches into first and second suction passages which, in turn, feed into first and second pumps. Each pump discharges a portion of the fluid to a return passage that is fluidly connected to the suction port of each respective pump. In each return passage, a return control valve is disposed to control the amount of fluid returned to the suction port. The tandem pump featured in this invention exhibits increased efficiency and decreased noise.
Claims5
A tandem pump apparatus comprising:
- a first pump having a suction port and a discharge port for discharging the fluid sucked from the suction port;
- a second pump having a suction port and a discharge port for discharging the fluid sucked from the suction port;
- a driving shaft driving the first pump and the second pump;
- a first return passage connecting the discharge port of the first pump with the suction port of the first pump for returning a part of the fluid discharged from the discharge port into the suction port;
- a second return passage connecting the discharge port of the second pump with the suction port of the second pump for returning a part of the fluid discharged from the discharge port into the suction port;
- a first return flow control valve disposed in the first return passage for controlling an amount of the fluid which is returned to the suction port of the first pump through the first return passage;
- a second return flow control valve disposed in the second return passage for controlling an amount of the fluid which is returned to the suction port of the second pump through the second return passage;
- a main suction passage connected with a fluid source;
- a first suction passage connecting the main suction passage with the first return passage which is located between the first return flow control valve and the suction port of the first pump;
- and
- a second suction passage connecting the main suction passage with the second return passage which is located between the second return flow control valve and the suction port of the second pump.
8 more elements
Dependencies are inferred from the claim text.