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Constant pressure variable speed inverter control booster pump system

  • US 5,941,690 A
  • Filed: 12/23/1996
  • Issued: 08/24/1999
  • Est. Priority Date: 12/23/1996
  • Status: Expired due to Fees
First Claim
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1. A constant pressure variable speed inverter control booster pump system comprising:

  • a constant pressure control system;

    combine pressure meter, pressure transmitter and CPU in one, installed in a stainless steel container, said CPU being a complementary metal-oxide semiconductor chip for analog-digital conversion, multiple set I/O pressure indication, and internal function determination, a pressure transmitter that detects the pressure of a water supply pipe, a filter amplifier that removes waves from said pressure sensor induced by the pulse of water pressure and amplifies filtered signal, a water supply pipe detecting circuit that detects the presence of water and a leakage of water in said water supply pipe, and provides a reference voltage signal to a window comparator for comparison when the water is not in use, or when there is a water leakage, a window comparator that compares the reference voltage signal of said pipe detecting circuit with a set value, and provides a signal to said CPU for judgement if the comparison result surpasses/or is below the preset pressure simultaneously drives a bi-color LED, a speed regulating circuit controlled by said CPU to buffer the dropping of speed of the system when said CPU detects the water is not in use, a stop buffering control circuit controlled by said CPU to stop the system a predetermined length of time after said speed regulating circuit has been controlled by said CPU to drop the speed of the system, when there is not any pressure change in said water supply pipe during this period, or to boost the speed rapidly if there is a pressure change in said water supply pipe during this period, and a power supply stabilizer that provides the system with stabilized power supply;

    an inverter controlled by said control unit to change output frequency;

    a motor controlled by said inverter to drive a pump;

    a pressure transmitter installed in said water supply pipe; and

    a pump controlled by said motor to pump water through said water supply pipe;

    wherein said control unit detects the change of pressure in said water supply pipe, and provides an analog signal DC 0V-10V to said inverter subject to the detection result, causing said inverter to change output frequency to said motor, so as to control the speed of said motor under a constant range.

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