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Vacuum system and a method of operating a vacuum system

  • US 5,624,394 A
  • Filed: 10/28/1994
  • Issued: 04/29/1997
  • Est. Priority Date: 10/28/1994
  • Status: Expired due to Term
First Claim
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1. A vacuum system comprising:

  • a vacuum line having an inlet and an outlet;

    a pump connected to the outlet of the vacuum line for drawing fluid therefrom;

    motor means connected to the pump to drive the pump;

    a pressure adjusting assembly including a second fluid line forming a branch off said vacuum line having a second inlet for conducting fluid into the vacuum line at an adjustable rate to vary the pressure therein;

    a pressure sensor connected to the vacuum line to sense the pressure therein and to generate a pressure signal representing the pressure in the vacuum line; and

    control means connected to the pressure sensor to receive the pressure signal therefrom, and includingi) means to generate a control signal representing the differences between the pressure in the vacuum line and a desired pressure,ii) means to compare the pressure signal to a given value to determine whether the pressure in the vacuum line is above or below a set point value; and

    iii) means to direct the control signal to the pressure adjusting assembly if the pressure in the vacuum line is above the set point value, and to direct the control signal to the motor means if the pressure in the vacuum line is below the set point value.

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