Pump system with liquid cooling operation
First Claim
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1. A pump system comprising:
- a pump unit composed of a turbo pump, a three-phase induction motor for operating said turbo pump, and a frequency/voltage converter for generating a frequency and a voltage to energize said three-phase induction motor, wherein an impeller of said turbo pump and a rotor of said motor are fixedly mounted on a main shaft which is supported by bearings, said motor also comprising a stator;
means for keeping a ratio of said voltage to said frequency constant and varying a rotational speed of said turbo pump in order to equalize a current of said three-phase induction motor to a constant current irrespective of a head of the pump; and
means for supplying a liquid pressurized by said impeller to at least one of spaces for thermal isolation between said stator and said bearings and between said stator and said rotor.
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Abstract
A pump control system has a pump unit composed of a turbo pump, a motor for operating the turbo pump, and a frequency/voltage converter for generating a frequency and a voltage to energize the motor. The rotational speed of the turbo pump is varied in order to equalize the current of the motor to a constant current irrespective of the head of the pump. The pump can be operated to take fully advantage of the current capacity of the motor.
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Citations
16 Claims
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1. A pump system comprising:
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a pump unit composed of a turbo pump, a three-phase induction motor for operating said turbo pump, and a frequency/voltage converter for generating a frequency and a voltage to energize said three-phase induction motor, wherein an impeller of said turbo pump and a rotor of said motor are fixedly mounted on a main shaft which is supported by bearings, said motor also comprising a stator; means for keeping a ratio of said voltage to said frequency constant and varying a rotational speed of said turbo pump in order to equalize a current of said three-phase induction motor to a constant current irrespective of a head of the pump; and means for supplying a liquid pressurized by said impeller to at least one of spaces for thermal isolation between said stator and said bearings and between said stator and said rotor. - View Dependent Claims (2, 3, 4)
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5. A pump system comprising:
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a pump unit composed of a turbo pump, a motor for operating said turbo pump, and a frequency/voltage converter for generating a frequency and a voltage to energize said motor, wherein an impeller of said turbo pump and a rotor of said motor are fixedly mounted on a main shaft which is supported by bearings said motor also comprising a stator; means for keeping a predetermined relationship of said voltage to said frequency and varying a rotational speed of said turbo pump in order to equalize a current of said motor to a constant current irrespective of a head of the pump; and means for supplying a liquid pressurized by said impeller to at least one of spaces for thermal isolation between said stator and said bearings and between said stator and said rotor. - View Dependent Claims (6, 7, 8)
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9. A pump system comprising:
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a pump unit composed of a turbo pump, a motor for operating said turbo pump, and a frequency/voltage converter for generating a frequency and a voltage to energize said motor, wherein an impeller of said turbo pump and a rotor of said motor are fixedly mounted on a main shaft which is supported by bearings, said motor also comprising a stator; means for equalizing a current of said three-phase induction motor to a constant current irrespective of a head of the pump; and means for supplying a liquid pressurized by said impeller to a space for thermal isolation between said stator and a heat producing portion other than said stator. - View Dependent Claims (10, 11, 12)
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13. A pump system comprising:
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a pump unit composed of a turbo pump, a motor for operating said turbo pump, and a frequency/voltage converter for generating a frequency and a voltage to energize said motor, wherein an impeller of said turbo pump and a rotor of said motor are fixedly mounted on a main shaft which is supported by bearings, said motor also comprising a stator; means for equalizing a current of said three-phase induction motor to a constant current irrespective of a head of the pump; and means for supplying a liquid to a space for thermal isolation between said stator and a heat producing portion other than said stator. - View Dependent Claims (14, 15, 16)
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Specification