JPH0236480B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oil intake pipe installed in an underground tank for storing liquid fuel such as gasoline at a gas station.

The oil suction pipe is installed inside the underground tank of the gas station.
The base end is connected to the pump of the oil supply system by piping, and it is desirable that the opening surface of the tip be as close as possible to the bottom plate of the underground tank so that all oil is sucked up without leaving any residue.

However, in order to prevent dirt and water accumulated on the bottom plate of the underground tank from being sucked up, the oil suction pipe is opened with a slight gap from the bottom plate of the underground tank.

However, when the remaining amount of oil in the underground tank becomes low and the liquid level reaches the opening at the end of the oil suction pipe, air is sucked up along with the oil, and the oil and oil are absorbed into cars coming to refuel. There is an inconvenience that air is measured and refueled, and the total amount of measured oil and air is displayed on the refueling amount display meter. In addition, it is necessary to bleed out air that has entered various parts of the oil supply system, which is troublesome.

The purpose of the present invention is to eliminate the above-mentioned disadvantages, and when the remaining amount of oil in the underground tank becomes low and the liquid level reaches the vicinity of the tip opening of the oil suction pipe, suction is automatically stopped, and as a result, air is removed. To provide an oil suction pipe that is free from the risk of sucking up oil.

However, according to the present invention, the purpose of the lever is to install an oil absorber in an underground tank of a gas station so that its tip is open close to the bottom plate of the underground tank, and whose base end is connected to the pump of the gas station by piping. The pipe is provided with a water remover that has a U-shaped cross section, has an upward opening that communicates with the tip of the oil suction pipe, and whose central portion is connected to the tip of the oil suction pipe, and the opening of this water remover can be closed. This is achieved by attaching an annular float valve to an oil suction pipe and providing a stopper above the annular float valve to prevent the annular float valve from floating up.

Embodiments of the invention will now be described in detail with reference to the drawings.

FIG. 1 is an explanatory diagram showing the usage state of the present invention, in which a water remover 3 and a float valve 4 are installed at the tip of an oil suction pipe 2 that opens into the underground tank 1 with a slight distance from the bottom plate of the underground tank 1. The oil suction pipe 2 is connected to an oil supply machine 7 through a pipe 6 via a fitting 5 having a check valve to prevent oil from flowing back into the underground tank 1 when not in use.

The water remover 3 has a U-shaped cross section and has an oil absorption pipe 2 in the center.
It is screwed onto the tip of the oil absorption pipe 2, and an opening surface 3a is formed on the upper surface, which communicates with the tip of the oil absorption pipe 2 inside. Therefore, the oil absorption pipe 2 opens into the underground tank 1 through the opening surface 3a of the water remover 3.

In the figure, reference numeral 8 denotes a small hole provided at the center of the bottom of the water remover 3 through which water separated and dropped in the oil absorption pipe 2 when the oil absorption device 7 is not in use falls to the bottom of the underground tank 1.

A ring-shaped float valve 4 is slidably fitted on the side of the oil absorption pipe 2 so as to correspond to the opening surface 3a of the water remover 3,
Furthermore, a stopper 9 for preventing the float valve 4 from floating further is protruded from the side surface of the oil suction pipe 2 at an upper position.

The diameters of the float valve 4 and the water remover 3 are both smaller than the diameter of the inlet 10 of the underground tank 1, so that they can be taken in and out during maintenance.

Next, the operation will be described. When the oil level in the underground tank 1 is far above the opening at the tip of the oil suction pipe 2, the float valve 4 is in a position where its upper surface abuts against the stopper 9. The oil in the underground tank 1 is sucked up from the oil suction pipe 2 through the opening surface 3a of the water remover 3 and sent to the oil supply machine 7.

When the remaining amount of oil in the tank 1 decreases and the oil level drops to the position shown by the chain line in FIG.
Since the opening surface 3a is blocked, further suction of oil from the oil suction pipe 2 communicating with the opening surface 3a is prevented, and the discharge of oil from the oil supply machine 7 is stopped. Note that if oil is reinforced into the underground tank 1, the float valve 4 will float up and the opening surface 3 will rise.
A can be opened and refueled.

As described above, the oil suction pipe of the present invention is equipped with a float valve that closes the opening at the tip of the oil suction pipe installed in the underground tank, so that the amount of oil remaining in the underground tank is reduced. When the oil level reaches a position slightly above the opening surface at the tip of the oil suction pipe, the float valve automatically closes the opening surface, so suction continues, and air is also sucked up and refueled. This has the effect of being able to reliably prevent oil from being stored away, and to let you know at that stage that the amount of oil remaining in the underground tank is low.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the usage state of the oil suction pipe of the present invention, FIG. 2 is an enlarged longitudinal sectional front view of the tip of the oil suction pipe,
FIG. 3 is a sectional view taken along the line AA in FIG. 2. 1... Underground tank, 2... Oil absorption pipe, 3... Water remover, 3a... Opening surface, 4... Float valve.

Claims (1)

[Claims] 1 An oil suction pipe with a U-shaped cross section and an oil suction pipe installed in an underground tank of a gas station so that its tip opens close to the bottom plate of the underground tank, and whose base end is connected to the pump of the gas supply system by piping. A water remover having an upward opening communicating with the tip of the pipe and a central portion connected to the tip of the oil suction pipe is provided, and an annular float valve capable of closing the opening of the water remover is attached to the oil suction pipe, An oil suction pipe characterized in that a stopper for preventing the annular float valve from floating is provided above the oil suction pipe.