초록 ▼

A vapor recovery system includes an anemometer positioned in the vapor return line to calculate the volume of returning vapor in the vapor return line. The anemometer is connected to a control system which compares the volume of returning vapor to the volume of fuel being dispensed and adjusts the s

A vapor recovery system includes an anemometer positioned in the vapor return line to calculate the volume of returning vapor in the vapor return line. The anemometer is connected to a control system which compares the volume of returning vapor to the volume of fuel being dispensed and adjusts the speed at which vapor is recovered so that the two volumes approximately equal one another. The anemometer may be a Wheatstone bridge arrangement or a pair of thermometers.

대표청구항 ▼

[ What is claimed is:] [1.] A fuel dispenser having a variable speed vapor recovery system comprising:a) a fuel delivery system adapted to deliver fuel along a fuel delivery path from a storage tank to a vehicle during a fueling operation;b) a variable speed vapor recovery system having a vapor reco

[ What is claimed is:] [1.] A fuel dispenser having a variable speed vapor recovery system comprising:a) a fuel delivery system adapted to deliver fuel along a fuel delivery path from a storage tank to a vehicle during a fueling operation;b) a variable speed vapor recovery system having a vapor recovery path to deliver vapors expelled from the vehicle to the underground storage tank when fuel is delivered during a fueling operation;c) an anemometer;d) a control system for controlling said variable speed vapor recovery system, said control system coupled to said anemometer to measure a parameter corresponding to emissivity associated with vapor flowing past the anemometer during a fueling operation and adapted to determine an actual flow rate of vapor in said vapor recovery path and control the vapor recovery system accordingly;e) wherein said vapor recovery system comprises two constant speed pumps operatively connected to said control system and wherein each pump is associated with a valve controlled by said control system, wherein each of said valves is adapted to control the rate of vapor recovery within different portions of said vapor recovery path.