JPH0441120Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to an automatic refueling switching structure for an underground tank in a gas station.

(b) Conventional technology Traditionally, gas stations have multiple tanks buried underground, with fuel pipes connected to the tanks, and the ends of the pipes connected to multiple metering machines installed above ground. The oil in the tank is sucked through the oil supply pipe, and the vehicle is refueled through the nozzle of the metering machine.

In addition, each tank is equipped with a liquid level sensor.
The system is configured to manage the inventory of each tank by detecting the amount of oil remaining in each tank.

(c) Problems that the invention aims to solve However, at such gas stations,
Since each tank has its own weighing machine,
This has the drawback that the frequency of oil absorption into the vehicle tends to be biased towards a specific weighing machine, and the amount of remaining oil in the tank connected to that weighing machine quickly decreases, resulting in the need to guide the vehicle to another weighing machine. Was.

Additionally, in order to solve the above problem, tanks were refilled in small quantities using lorries, but such frequent replenishment increases transportation costs, making inventory management for each tank extremely difficult. It was complicated and hot.

(d) Means for solving the problem In this invention, in a gas station where multiple underground tanks are buried and multiple metering machines are connected to the same underground tanks, the tip of the fuel pipe from each underground tank is installed. An annular supply pipe was connected to the tank, and each weighing machine was connected to the annular supply pipe via a weighing machine refueling pipe, and a switching valve was installed in each underground tank in each refueling pipe. The present invention provides an automatic refueling switching structure for an underground tank in a gas station, characterized in that it is configured to be controlled based on a liquid level detection value of a liquid level sensor.

(E) Functions and Effects With the configuration described above, the present invention has the following functions and effects.

In this invention, when refueling a vehicle with gasoline from an underground tank, each meter is connected to the connection of the fuel pipe of each underground tank, so each meter can refuel from any underground tank. It can be carried out.

Therefore, by refueling each underground tank from each weighing machine, refueling work can be smoothly performed without guiding the vehicle.

In addition, by controlling the operating operation of the switching valve installed in the refueling pipe of each underground tank based on the liquid level detection value of the liquid level sensor installed in each underground tank, the refueling operation of each underground tank can be performed. inventory management can be done easily and smoothly, and the frequency of replenishing underground tanks can be reduced.

Furthermore, when supplying oil from an underground tank to a metering machine via an annular supply pipe, if part of the annular supply pipe becomes clogged with foreign matter, the supply pipe is annular, so it will not be clogged. Oil flows from the opposite direction, bypassing the matsuta section, and is smoothly supplied to the weighing machine, ensuring reliable refueling from the underground tank.

(F) Embodiment The embodiment of the present invention will be explained in detail based on the drawings.
Figure 1 is a schematic diagram of a gas station according to the present invention. Gas station A has a plurality of underground tanks 1, 2, and 3 buried underground. It stores Yuler gasoline, etc.

In addition, underground tanks 1, 2, and 3 are connected to oil supply pipes 4, 5, and 6, respectively, and each oil supply pipe 4, 5, and 6 is connected to a measuring machine 7, 8, and 6 installed on the ground.
The metering machines 7, 8, and 9 are connected to the metering machines 7, 8, and 9 to refuel vehicles and the like at a gas station.

Therefore, in the present invention, such an underground tank 1,
Each measuring machine 7 is attached to the oil supply pipes 4, 5, and 6 of
8 and 9 are connected, and each weighing machine 7, 8, 9 is configured to be refueled from each underground tank 1, 2, 3, respectively.

The structure will be explained in detail below.

That is, as shown in Fig. 1, the tips of the oil supply pipes 4, 5, and 6 hang down inside the underground tanks 1, 2, and 3; The oil supply pipes 4 , 5 , and 6 extend horizontally and in parallel, and their tips are connected to the annular supply pipe 10 .

In addition, the base ends of the weighing machine refueling pipes 11, 12, 13 are attached to the annular supply pipe 10, and the tips of the weighing machine refueling pipes 11, 12, 13 are connected to the weighing machines 7, 8, 9 on the ground. It is connected.

As shown in FIG. 1, the annular supply pipe 10 is formed into an annular shape with each pipe 10a,
Base end pipes 4, 5,
In addition, the distal ends of the measuring machine proximal pipes 11, 12, and 13 are connected to the distal end side of the annular supply pipe 10.

Note that the fuel supply pipes 4, 5, 6 and the annular supply pipe 10, etc. are buried underground on the underground tanks 1, 2, 3 side, and the metering machine fuel supply pipes 11, 12, 1
3 is extended and connected to weighing machines 7, 8, and 9 installed on the ground at the tip thereof.

With this structure, the annular supply pipe 10 transfers the suction force from each weighing machine 7, 8, 9 to each underground tank 1,
2 and 3 are received, and gasoline can be sent to any of the measuring machines 7, 8, and 9.

Furthermore, since the annular supply pipe 10 is filled with gasoline, it is configured to prevent the gasoline from vaporizing due to the negative pressure of the suction force, and to avoid vapor lock, etc., and to perform the refueling operation smoothly. There is.

Underground tanks 1, 2, and 3 configured as above
has an automatic refueling switching structure, and refueling of each underground tank 1, 2, 3 is performed by detecting the liquid level L of each underground tank 1, 2, 3.

That is, the switching valves 14, 15, 1 are installed at the base ends of the oil supply pipes 4, 5, 6 of the underground tanks 1, 2, 3.
6 are installed respectively, and the switching valves 14,
At 15, 16, oil is supplied from each underground tank 1, 2, 3 to each measuring machine 7, 8, 9 via an annular supply pipe 10.

Note that the switching valves 14, 15, and 16 are constituted by motor-driven automatic valves or electromagnetic valves using a two-way switching system.

In addition, each underground tank 1, 2, 3 is provided with a liquid level sensor 17, 18, 19, respectively, and is configured to detect the height of the liquid level L with the liquid level sensor 17, 18, 19. There is.

The liquid level sensors 17, 18, 19 are constructed by connecting a case body 20 containing a transmitter etc. to an underground tank 1,
2 and 3, and a communication pipe 21 is provided vertically from the liquid level sensor main body 20 into the underground tanks 1, 2, and 3.

A scale tape 23 having a float 22 at its lower end is suspended into the underground tanks 1, 2, and 3 via a communication pipe 21.

With this structure, the height of the liquid level L in each of the underground tanks 1, 2, and 3 is detected by the float 22, and the amount of remaining oil is measured.

Note that in this embodiment, the liquid level sensors 17, 1
8 and 19 are composed of a case body 20, a float 22, a scale tape 23, etc.
The liquid level sensors 17, 18, and 19 are not limited to the structure described above, and it is also possible to measure the amount of remaining oil in the tank using other structures.

In the present invention, the transmitting parts of the liquid level centers 17, 18, 19 of the underground tanks 1, 2, 3 are received, and the transmitting parts and the switching valves 14, 15, 16 are connected to the control device S.
, and the control device S controls the switching valves 14 and 1.
5, 16, each underground tank 1,
The configuration is such that 2 and 3 oiling is performed evenly.

Hereinafter, in FIG. 1, the control device S includes a microprocessor 25 and an input/output interface 2.
6, 27, and a memory 28 consisting of ROM.The interface 2 inputs detection signals from the transmitter to the liquid level sensors 17, 18, 19.
Send to 6.

On the other hand, the switching valves 14, 15, and 16 are connected to the output interface 27, and the switching valve 1
4, 15, and 16.

In addition, 14a, 15a, 16a are the switching valves 1
4, 15, and 16, and receives a signal transmitted from the control device S to operate the switching valves 14, 1.
Perform the opening/closing operations in steps 5 and 16.

The memory 28 also stores a program for opening and closing the switching valves 14, 15, 16 based on detection signals from the liquid level sensors 17, 18, 19 described above.

In this way, the control device S controls the opening and closing operations of the switching valves 14, 15, 16 of the underground tanks 1, 2, 3, and the weighing machines 7, 8, 9 control the switching valves 14, 15, 16 of the underground tanks 1, 2, , 3 is configured to smoothly supply oil evenly.

Furthermore, in this embodiment, the control device S is configured to simultaneously supply fuel from mainly two of the three underground tanks 1, 2, and 3.

Underground tanks 1, 2, 3 configured as above
The automatic lubrication switching structure is shown in Figures 2 to 6.
The details are as follows.

That is, FIG. 2 shows the underground tanks 1, 2, and 3 in a full state. In this case, the control device S selects the two underground tanks 1 and 2 according to the height of the liquid level L, and the switching valves 14 and 15 of the underground tanks 1 and 2 are operated.
The tanks are opened and fuel is supplied from underground tanks 1 and 2.

In this case, the switching valve 16 of the underground tank 3
is in a closed state.

Next, when the height of the liquid level L in the underground tanks 1 and 2 falls, the control device S selects two underground tanks 1 and 3 as shown in FIG. , 3 to open the switching valves 14 and 16, and refuel from the underground tanks 1 and 2.

In this case, the switching valve 15 of the underground tank 2
is in a closed state.

In addition, in FIG. 4, when the height of the liquid level L of the underground tanks 1 and 2 reaches the refueling stop position, the control device S controls the switching valves 14 and 2 of the underground tanks 1 and 2.
15 is closed, the switching valves 16 of the other underground tanks 3 are opened, and only the underground tanks 3 are refueled.

When the height of the liquid level L of each underground tank 1, 2, 3 reaches the refueling stop position, each switching valve 14,
15 and 16 are closed, and the refueling work is completed.

In addition, in the above state, when replenishing gasoline to any of the underground tanks 1, 2, and 3, as shown in FIGS. 5 and 6, depending on the height of the liquid level L, the underground tank 1 , 2 or underground tank 3 only.

In this embodiment, when the liquid level L drops by about 10%, the control device S switches on each switching valve 14, 15, 16.
However, in another embodiment, the two underground tanks 1 and 2 are used as main tanks, and the remaining underground tank 3 is used as a sub-tank, and the control device S is operated as described above. Through control, it is also possible to refuel only the sub-tank after the two main tanks have been refueled.

The embodiment of the present invention is constructed as described above, and when refueling a vehicle etc. with gasoline in the underground tanks 1, 2, 3, the fuel supply pipes 4, 5, Since the weighing machines 7, 8, and 9 are connected to the tank 6 via the annular supply pipe 10, any of the weighing machines 7, 8, and 9 can be connected to each underground tank 1, 2, and 3.
can be refueled.

Therefore, by refueling each underground tank 1, 2, 3 from each weighing machine 7, 8, 9, refueling work can be smoothly performed without guiding the vehicle.

In addition, the liquid level sensors 17, 18 provided in each underground tank 1, 2, 3 control the operation of the switching valves 14, 15, 16 provided in the fuel supply pipes 4, 5, 6 of each underground tank 1, 2, 3. In order to perform equal refueling operations in each underground tank 1, 2, and 3 by controlling the liquid level detection value of 19, inventory management of each underground tank 1, 2, and 3 is easily and smoothly performed, 1, 2,
The frequency of replenishment to 3 can be reduced.

In addition, the above structure consists of three underground tanks 1,
2 and 3 have been explained in detail, but the number of underground tanks is not limited in any way. In the present invention, for example, when five underground tanks are used, three underground tanks are mainly controlled via the control device S. By controlling the amount of remaining oil in each underground tank, inventory management of each underground tank can be performed smoothly.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the automatic refueling switching structure of an underground tank at a gas station according to the present invention;
FIGS. 2 to 6 are explanatory diagrams showing the automatic refueling switching operation state of the underground tank. In the diagram, 1, 2, 3...underground tank, 4, 5, 6
...Refueling pipe, 7,8,9...Measuring machine, 14,
15, 16...Switching valve, 17, 18, 19...Liquid level sensor.

Claims (1)

[Scope of claim for utility model registration] A plurality of underground tanks 1, 2, and 3 are buried, and a plurality of weighing machines 7,
8 and 9, an annular supply pipe 10 is connected to the tip of the fuel supply pipe 4 from each underground tank 1, 2, and 3, and
The same annular supply pipe 10 is connected to the metering machine oil supply pipes 11 and 1.
The measuring machines 7, 8, 9 are connected through the pipes 2, 13, and the switching valves 14, 1 are connected to each oil supply pipe 4.
Automatic refueling of underground tanks at a gas station, characterized in that the operating operations of 5 and 16 are controlled by liquid level detection values of liquid level sensors 17, 18, and 19 provided in each underground tank 1, 2, and 3. Switching structure.