Fluid flow regulation
Publication Date: 2014-Sep-12
The IP.com Prior Art Database
The basic concept of this invention is to measure the ambient temperature of the fuel dispensing unit or the temperature of the fuel and thereafter regulate the flow rate of the fuel in the fuel line and/or fuel hose based on the measured temperature.
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FLUID FLOW REGULATION
A fuel dispensing unit used for filling the fuel tank of a vehicle with fuel is a complex device containing a vast number of components connected to each other. Normally, fuel is pumped from an underground reservoir up to the fuel dispensing unit through a fuel pipe. From there, the fuel is pumped to a
nozzle through a fuel hose and into the vehicle to be refueled via said nozzle. The fuel pipe and the fuel hose are connected by means of a hose connection. Since the underground reservoir is placed several meters below the fuel dispensing unit there are certain requirements on the pump which is to be used for pumping the fuel up to the fuel dispensing.
A problem with the fuel dispensing units on the market today may occur when they are used in countries with a high temperature climate. When fuel is pumped from the underground reservoir up to the fuel dispensing unit, the vacuum level in the fuel line increases with the flow rate of the fuel. When the ambient temperature is high, in combination with a high flow rate in the
fuel line, the vacuum level in the fuel line might increase so much that the fuel vaporizes and/or so that pump will be unable to pump the fuel from the underground reservoir and up to the fuel dispensing.
Description of the invention
The basic concept of this invention is to measure the ambient temperature of the fuel dispensing unit (see figure) or the temperature of the fuel and thereafter regulate the flow rate of the fuel in the fuel line and/or fuel hose based on the measured temperature. In one exemplary embodiment of the invention, a temperature sensor is provided in the fuel line of the fuel
dispensing unit and a solenoid valve is provided in the fuel hose of the fuel dispensing unit. The temperature sensor and the solenoid valve are in turn both connected to a control unit. The control unit monitors the temperature of the fuel flowing through the fuel line and when the fuel temperature reaches a critical temperature, the maximum allowed fuel flow in the fuel hose is
regulated (limited) using the solenoid valve provided fuel hose. If the normal fuel flow rate in each fuel hose (during maximum use of the fuel dispensing unit) is approximately 40 liters/minute, the fuel flow rate may for example be lowered to 30 liters/minute in order to avoid the problems discussed above.
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