Pump unit with multiple operation modes

Details Pump unit with multiple operation modes Pump unit with multiple operation modes

2008-07-15

2008-07-15

Kramer, Devon (Department: 3746)

Pumps

Condition responsive control of pump drive motor

In response to pump speed

C417S044200, C417S287000

Reexamination Certificate

active

10516912

ABSTRACT:
A first pump of small capacity and a second pump of large capacity are connected directly with each other and are driven by a variable-speed motor. The rotational speed of the variable-speed motor is controlled by a control device. In a first mode, a first discharge line of the first pump and a second discharge line of the second pump are disconnected with each other, making the first pump unloaded. With the first pump in the unloaded state, a constant-horsepower operation is performed, where the discharge fluid is brought into a high pressure by relatively small torque. In a second mode, the first discharge line and the second discharge line are connected with each other by a switching valve. With the first and second discharge lines in the connected state, a constant-horsepower operation is performed, where a high flow rate of discharge fluid is discharged at relatively low rotational speed.

REFERENCES:
patent: 3695783 (1972-10-01), Soyland et al.
patent: 5199854 (1993-04-01), Aoyama
patent: 5228289 (1993-07-01), Norton
patent: 2456929 (1975-08-01), None
patent: 1515157 (1978-06-01), None
patent: 2075132 (1981-11-01), None
patent: 51-163501 (1976-12-01), None
patent: 53-50502 (1978-05-01), None
patent: 53-50504 (1978-05-01), None
patent: 60-100594 (1985-07-01), None
patent: 4-92708 (1992-03-01), None
patent: 5-263768 (1993-10-01), None
patent: WO97/32128 (1997-09-01), None

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