JPH03226495A - Automatic overflow preventing device - Google Patents

Abstract

PURPOSE:To prevent fuel from overflowing by inserting a control tube into a fuel pouring tube for connecting an underground fuel storage tank side of a fuel station, etc., to a remote fuel pouring port side, and branching the pouring tube and the control tube at the ends. CONSTITUTION:A tube 12 is inserted from one end of a fuel pouring tube 11, the tube 12 and the tube 11 are branched at an underground fuel storage tank 1 side, the tube 12 is inserted into a level inspection tube 13, and the end of a tube 12' is located at the height of a fuel level 14 immediately before the tank 1 is fully filled. Fuel is supplied from a tank lorry to the tank 1 through a remote pouring tube 15, the tube 11, and the lever 14 is shifted to the upper side of the tank 1. A valve 2 has a structure in which the air in the space of the tank 1 from the end of the tube 12' is sucked through the tube 12 during fuel supplying so as not to close the valve 12. When the level 14 is shifted and the end of the tube 12' is dipped in the level 14, the air is simultaneously shut OFF, negative pressure is generated in the valve 2, a diaphragm in the valve 2 is operated to stop supplying of the fuel.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) This invention relates to automatic prevention of tank overflows in gas stations.

(Prior Art) At a gas station, gasoline or the like is unloaded from a tank lorry into an underground fuel storage tank installed in the basement of the gas station via a gas hose and a gas pipe. If oil is accidentally poured into the full underground oil storage tank during unloading, there is a risk that it will overflow and cause an explosion. In order to prevent this, conventionally known methods include transmitting an electrical signal from a liquid level gauge to a control unit and controlling a valve attached to a remote oil filler port via the electrical signal and air, or installing the valve directly above the underground oil storage tank. There are valves that are installed inside the tank, and float valves that are inserted into underground oil storage tanks.

(Problem that the invention attempts to solve) The above conventional methods have various problems.

However, the structure is complicated and expensive, it cannot be retrofitted to existing pipes, and the operating status of the valve cannot be confirmed, and float valves cannot be inserted into existing underground oil storage tanks because they are equipped with drop pipes. etc. Additionally, there are other problems such as generally high installation costs.

(Means for Solving the Problems) The present invention has been made to solve the above-mentioned problems of the conventional art, and its feature is that a control pipe or the like is inserted into the oil supply pipe, and the oil supply pipe is separated from the oil supply pipe. The problem is solved by taking out the control pipe etc. from the end.

(Function) According to the present invention, first, a control pipe, for example, a duplex is inserted from one end of the oil supply pipe, the duplex is taken out from the branch end of the oil supply pipe, and the +iiij duso is inserted into the underground oil storage tank. Insert the +iii duup from the piping 11 without a drop pipe, and place the tip of the duup at a predetermined position in the underground oil storage tank. Next, a suitable valve on the remote lubrication side, e.g., U.S. Pat.
3 [14770317] By attaching the valve to the remote lubrication L1 side, the valve closes when the water level reaches the predetermined position.
prevent overflow.

(Example) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In Fig. 1, 12 is a tube, 11 is an oil pipe, and a pipe 12 is inserted from one end of the tube, and a duplex 12 and an oil supply pipe 11 are branched on the ground aluminum storage tank 1 side. The tube 12 is inserted into the measuring tube 13,
The tube 12 is placed at a predetermined position in the underground oil storage tank or at the level of the oil level 14 just before the underground oil storage tank 1 is full.
Valve 2 is connected to Note 71tt pipe 11, and the oil level 14 connected to valve 2 is at the same level as the tip of dupe 12', so valve 2 is connected to pipe 11.
Since it is closed, oil cannot enter from the remote oil filler port 15. According to the embodiment of the present invention, first, the remote L1. Oil port 15, oil supply pipe II,
At the same time that the underground oil storage tank I is being refueled via the underground oil storage tank I, the water level 14 moves to the upper side of the underground oil storage tuck I. - During the recording AI+, the valve 2 is structured so that it cannot be closed by sucking air in the space of the underground oil storage tank 1 from the tip of the tube 12' through the tube 12. At the same time as the water level 14 in the second pool shifts and the tip of the duplex 12' is immersed in the water level I4, the air is shut off, negative pressure is generated in the valve 2, and the diaphragm and valve in the valve 2 operate to supply oil. Stop the city.

(Effects of the Invention) Since the overflow prevention device of the present invention utilizes the oil supply pipe that is always provided at the gas station as described above and arranges the tube, there is no need to embed the tube. Therefore, it can be installed at existing refueling stations without any hindrance to refueling operations, and is generally inexpensive to install.

[Brief explanation of drawings]

Figure 1 shows the allowable capacity q of an underground oil storage tank at a gas station.
It is a schematic configuration diagram in which +11 is used.・・Underground oil storage tank, 2・・・・Valve, ・Conocrete, 4・・・・Do[1 Tube, ・Note Mu
Tube, 12...Dupe,...Tube tip, 13...Measuring tube,...Ura water level, j5
・−・・Remote lubrication port.

Claims (1)

[Claims] An automatic overflow prevention device characterized in that a control pipe is inserted into an oil filling pipe that connects an underground oil storage tank side and a remote oil filling port side of a gas station, etc., and the oil filling pipe and the control pipe are branched at a branching end.