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US 4,699,570 AGranted
Vacuum pump system
AssigneeITT Industries, Inc.
InventorHeinz Bohn
Life of this patent
Estimating the term…
Abstract
A vacuum pump aggregate utilizes a microprocessor in conjunction with pressure and temperature sensors and motor control circuits to regulate the pressure by varying the speed of one or more vacuum pumps. Measured temperature and/or pressure values are compared with predetermined values by the microprocessor which in turn adjusts the speed of the motors.
Claims18
A vacuum pump arrangement comprising:
- a suction inlet;
- a first vacuum pump coupled to said suction inlet and having a first drive motor;
- a second vacuum pump serially coupled to said first vacuum pump and having a second drive motor;
- sensors for measuring predetermined operational parameters of said arrangement;
- at least a first motor speed circuit coupled to one of said first or second drive motors and responsive to control signals for varying the speed of said one drive motor;
- interface circuits coupled to said sensors;
- a microprocessor coupled to said interface circuits and to said motor speed circuits and operational to compare the values of parameters measured by said sensors to predetermined parameters to generate said control signals whereby the speed of said one drive motor is adjusted;
- said sensors comprising a first temperature sensor and a first pressure sensor coupled to the exhaust line of said first pump;
- said first motor speed circuit being coupled to said first motor;
- and said microprocessor being responsive to said first temperature sensor and said first pressure sensor to determine a desired speed of said first motor and to provide control signals to said first motor speed circuit to adjust the speed of said first pump.
7 more elements
A vacuum pump arrangement comprising:
- a piston pump;
- a first pressure sensor and a first temperature sensor in the suction line of said piston pump;
- second pump having its suction line coupled to the exhaust of said piston pump;
- a second pressure sensor and a second temperature sensor in the suction line of said second pump;
- said first and second pressure and temperature sensors providing measured predetermined operational parameters of said arrangement;
- a controller for controlling the operation of said piston pump, said controller being automatically operable to continuously adjust the speed of said piston pump such that the values of said measured predetermined operational parameters correspond to predetermined parameter values.
3 more elements
A vacuum pump arrangement comprising:
- a suction inlet;
- a first vacuum pump coupled to said suction inlet and having a first drive motor;
- a second vacuum pump serially coupled to said first vacuum pump and having a second drive motor;
- sensors for measuring predetermined operational parameters of said arrangement, said sensors comprise a first temperature sensor and a first pressure sensor for monitoring the temperature and pressure, respectively, in the suction line of said first vacuum pump;
- at least a first motor speed circuit coupled to one of said first of second drive motors and responsive to control signals for varying the speed of said one drive motor;
- interface circuits coupled to said sensors;
- a microprocessor coupled to said interface circuits and to said motor speed circuits and operational to compare the values of parameters measured by said sensors to predetermined parameters to generate said control signals whereby the speed of said one drive motor is adjusted.
4 more elements
A vacuum pump arrangement in accordance with clain 11, wherein:
- said sensors comprise a second temperature sensor and a second pressure sensor for monitoring the temperature and pressure, respectively, between said first and second vacuum pumps.
Dependencies are inferred from the claim text.