Vapor recovery system for fuel dispenser
DCFirst Claim
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1. A fuel delivery system including:
- fuel delivery means having a variable volumetric flow;
means for providing an electrical signal indicative of the volumetric flow of said fuel delivery means;
vapor recovery means having a controllable volumetric flow, said vapor recovery means having means for sucking vapor at a first end and for ejecting it at a second end; and
means responsive to said electrical signal for making the volumetric flow of said vapor recovery means the same as the volumetric flow of said fuel delivery means.
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Abstract
A system for recovering vapor and liquid emerging from a tank as it is being filled, in which the volumetric flow of a recovery pump that withdraws the vapor through a recovery tube is made equal to the volumetric flow of a fuel delivery pump with a microprocessor. The microprocessor can also modify the volumetric flow of the recovery pump in response to variations in the hydraulic pressure at the inlet side of the recovery pump.
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Citations
15 Claims
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1. A fuel delivery system including:
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fuel delivery means having a variable volumetric flow; means for providing an electrical signal indicative of the volumetric flow of said fuel delivery means; vapor recovery means having a controllable volumetric flow, said vapor recovery means having means for sucking vapor at a first end and for ejecting it at a second end; and means responsive to said electrical signal for making the volumetric flow of said vapor recovery means the same as the volumetric flow of said fuel delivery means. - View Dependent Claims (2, 3, 4)
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5. In a system for delivering vaporizable liquid into an opening of a tank in such manner as to recover liquid and vapor that escapes from the opening, the combination comprising:
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a delivery hose; a nozzle connected to one end of said delivery hose for controlling the flow of said liquid into said tank; first pumping means coupled to the other end of said delivery hose; means coupled between said delivery hose and said pumping means for providing a first electrical signal representing the volumetric flow of fuel through said delivery hose; a recovery hose; second pumping means coupled to said recovery hose for drawing vapor through said recovery hose; transducer means coupled to an inlet of said second pumping means for providing a second electrical signal representing a hydraulic pressure in said recovery hose; and control means for said second pumping means including an electrical signal processor, said control means being responsive to said first electrical signal for initially making the volumetric flow of said second pumping means equal to the volumetric flow in said delivery hose and responsive to said second electrical signal for modifying the volumetric flow of said second pumping means as required to maintain said hydraulic pressure in said recovery hose within a given range of values.
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6. In a system for delivering vaporizable liquid into an opening of a tank in such manner as to recover vapor that may emanate from said opening, the combination comprising:
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a liquid delivery hose; a first pump coupled to said delivery hose so as to be capable of forcing a flow of liquid through it; a recovery hose; a second pump coupled to said recovery hose so as to be capable of withdrawing a flow of liquid and vapor through it, said second pump having an inlet side; signalling means for providing an electrical signal indicative of the volumetric flow in one of said hoses; and control means responsive to said signal for controlling the one of said pumps coupled to the other hose in such manner that it produces the same volumetric flow in said other hose as that in said one hose. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. In a system for delivering vaporizable liquid into an opening of a tank in such manner as to recover liquid and vapor that may emanate from said opening during delivery, the combination comprising:
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a liquid delivery hose; a liquid delivery pump coupled to said delivery hose; metering means coupled to one of said delivery hose and said delivery pump for providing pulses occurring at a repetition rate corresponding to the volumetric flow of liquid through said delivery hose; recovery hose for liquid and vapor; a recovery pump, a motor coupled to drive said recovery pump, said recovery pump producing a volumetric flow through said recovery hose corresponding to a repetition rate of drive pulses applied to said motor; a source of drive pulses that may be varied in repetition rate coupled to said motor; and processor control means responsive to the pulses provided by said means for metering, for controlling the repetition rate of drive pulses provided by said source of drive pulses so as to cause said recovery pump to have the same volumetric flow as said liquid delivery pump.
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14. In a system for delivery vaporizable liquid into an opening of a tank in such manner as to recover liquid and vapor that may emanate from said opening during delivery, the combination comprising:
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a liquid delivery hose; a pump coupled to said delivery hose so as to be capable of forcing a flow of liquid through it; a vapor recovery hose; a pump coupled to said vapor recovery hose so as to be capable of withdrawing a flow of vapor and liquid through it; means for providing an electrical signal indicative of the volumetric flow in said delivery hose; and means responsive to said signal for controlling said recovery pump in such manner that it produces a flow in said recovery tube having the same volumetric rate as the volumetric rate in said delivery hose.
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15. In a system for delivering vaporizable liquid into an intake pipe of a tank in such manner as to recovery fumes or liquid emanating therefrom during the delivery process, the combination comprising:
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a liquid delivery hose; means coupled to said delivery hose for providing electrical indication of the volumetric flow through it; a chamber for collecting any fumes or liquid emanating from the intake pipe when coupled thereto; a recovery tube communicating with said chamber; a recovery pump of the displacement type, communicating with said recovery tube; and means responsive to said electrical indications for driving said recovery pump at a speed such that it has a derived volumetric flow as the volumetric flow in said delivery tube.
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Specification