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Fluid pump

  • US 4,443,216 A
  • Filed: 04/09/1982
  • Issued: 04/17/1984
  • Est. Priority Date: 04/15/1981
  • Status: Expired due to Fees
First Claim
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1. A fluid pump device for use in conjunction with a chamber having a contained volume which can be reduced elastically and which incorporates or is locatable in circuit with spaced-apart unidirectional valves through which fluid can be passed with cyclic compression and expansion of the chamber;

  • said pump device comprising;

    a pair of spaced-apart clamp elements between which the pumping chamber is located in use of the device,electrically energisable means operable when energized to move one of the clamp elements relative to the other in an opening direction to permit expansion of the chamber,biasing means for exerting a closing force on the clamp elements whereby the chamber is biased to a compressed condition following de-energisation of the electrically energisable means,timing means for detecting the time duration T incurred in compressing the chamber to a predetermined extent against back pressure exerted by fluid within the chamber,fault indicating means for providing a fault condition indication if during operation of the device the time duration T incurred in compressing the chamber is less than a first predetermined time period T1 as a result of an excessively low back pressure being present in the chamber or is greater than second predetermined time period T2 as a result of an excessively high back pressure existing in the chamber, andelectrically actuatable adjusting means for adjusting the force exerted by the biasing means so that, when the device is subjected to normal no-fault operating conditions, the terminal end of the time duration T is located within a time slot bounded by the predetermined time periods T1 >

    T and T2 <

    T.

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