JPS609198Y2 - Refueling device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fuel supply system in which a single underground pipe extending from an underground tank is branched and each of the branch pipes is connected to a fuel pump.

As shown in FIG.
A refueling system consisting of refueling pumps 2, 3, filters 4.5, air separator bodies 6, 7, flow meters 8, 9, etc. is installed independently inside the tank, and underground piping extends from the underground tank 10. 11 and branch piping 11a, ll.
b to each oil supply pump 2, 3 via check valve 12, 13, respectively.
There is a type of oil supply device that supplies oil independently from nozzles 16, 17 of oil supply hoses 14, 15 extending from the discharge sides of flowmeters 8, 9.

The amount of oil supplied from nozzles 16 and 17 is indicated on each display meter 1.
It will be displayed on 8.19.

In this type of oil supply system, the air separator main bodies 6 and 7 described above are independently connected to the oil supply pumps 2 and 3.
It is arranged between the suction side and the discharge side of the.

Since the refueling device for refueling the same liquid type has the above-mentioned configuration, the piping construction cost is low, so it is often implemented.

In this product, oil is supplied using the oil supply system on the left side in Figure 1.
When the fuel pump 2 is then abruptly stopped, the oil sucked up by the fuel pump 2 tries to return to the underground tank 10 through the underground pipe 11a and the underground pipe 11, but the flow path is blocked by the check valve 12. In order to do so, the oil passes through the branch pipe 11b, pushes open the check valve 13, and flows into the oil supply system on the right side of FIG.

Since oil is also present in the oil supply system into which this oil has flowed, the oil has nowhere to go and flows into the air separator main body 7, where it accumulates.

As shown in FIG. 2, a space S is provided inside the air separator bodies 6, 7 to separate liquid and air, and can accommodate a certain amount of oil.

However, when refueling is performed using only one refueling system, in the example mentioned above, too much oil accumulates inside the air separator main body 7 side, and eventually the vent pipe, which is open to the atmosphere, causes vapor to escape to the atmosphere. The problem remained that oil liquid would be blown out from 7a and 6a.

The present invention solves the above-mentioned problems, and is characterized in that the air separator (-) is used in common as an air separator for multiple oil supply systems to prevent oil from blowing out. .

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 3, the same components as those in FIGS. 1 and 2 will be described with the same reference numerals.

The refueling pump 2 in the refueling device main body 1 is connected to a branch pipe 11a of the underground pipe 11 via a check valve 12, and similarly, the refueling pump 3 is connected to a branch pipe 11b of the underground pipe 11 via a check valve 13. has been done.

A filter 4 is provided on the discharge side of the oil supply pump 2, and a filter 4 is provided on the discharge side of the oil supply pump 2.
A filter 5 is connected to the discharge side of each.

The conduits 20 and 21 that guide the oil-containing air from the filters 4 and 5 are connected to the - air separator main body 22, and the oil return pipes 23 from the air separator main body 22 are branched, respectively. The pipes 23 a and 23 b are opened to the suction side of each oil supply pump 2 and 3 on the downstream side of the check valves 12 and 13 .

Further, from the upper part of the air separator main body 22, a vent pipe 22a that is open to the atmosphere is led out to release vapor into the atmosphere.

Note that the valve 2 of the float 25 floating inside the air separator body 22 returns the oil liquid in the air separator body 22 to the oil supply pumps 2 and 3.
5a.

In this device, when the oil supply pump 2 is used to supply oil, if the oil supply pump 2 is abruptly stopped, the oil on the oil supply pump 3 side flows into the air separator main body 22.

This increases the amount of oil in the air separator body 22.

However, since the air separator main body 22 is shared, if the oil in the air separator main body 22 rises above a predetermined level when the oil supply pump 2 is operated and the valve 25a opens, the oil inside the main body 22 will rise. The oil liquid is returned to the suction side of the pump 2 via the branch pipe 23a, and the liquid level inside the main body 22 is lowered.

Therefore, the oil liquid will no longer be blown out into the atmosphere.

When the valve 25a closes the oil return pipe 23, the oil from the main body 22 is no longer sucked in, and the air inside the main body 22 is no longer sucked into the oil supply pumps 2 and 3.

In addition, in this embodiment, the oil return pipe 23 from the air separator main body
The branch pipes 23a and 23b are connected to the branch pipe 11a on the downstream side of the check valve 12.13.

11b, and the oil return pipe 23 is opened on the suction side of each oil supply pump 2, 3, but the oil return pipe 23 is directly connected to the branch pipe 11a, 11 on the upstream side of the check valves 12, 13.
The oil return pipe 23 may be opened on the suction side of each of the oil supply pumps 2 and 3 by connecting to the - of the bs pipe 11.

In the embodiment, check valves were installed only in the branch pipes 11a and llb, but if the branch pipes are long or there is a height difference between the underground tank and the branch pipes, check valves are installed in the pipe 11. may be provided.

As described above, the present invention uses a common air separator to discharge excess oil every time refueling, so the underground piping is branched into multiple parts and a refueling pump is connected to each of the branch pipes. Even if the piping is installed in the air separator, the oil liquid will not overflow from the air separator, making it safer.

Since there is no need to lead out a large number of underground pipes from underground tanks and connect them to the oil supply pumps, piping work becomes easier and the cost of piping work is reduced.

Furthermore, since only one air separator is required, an inexpensive oil supply device can be provided, and the blowout of oil can be reliably prevented, which is highly effective.

[Brief explanation of drawings]

Figure 1 shows the constituent countries of a conventional oil supply system. FIG. 2 is a cross-sectional view of the air separator. FIG. 3 shows a configuration of an embodiment of the present invention, and shows a fuel supply device in which a plurality of fuel supply mechanisms are incorporated in one fuel supply device main body. 2.3... Fuel pump, 10... Underground tank, 11... Underground piping, lla, llb.
... Branch pipe, 22 ... Air separator main body, 23 ... Oil return pipe.

Claims (1)

[Scope of utility model registration request] A conduit in which underground piping extending from an underground tank is branched, each branch pipe is connected to each fuel pump, a filter is connected to the discharge side of each fuel pump, and air containing oil from each filter is guided. 1. A refueling device, characterized in that: - is connected to an air separator main body, and an oil return pipe from the air separator main body is opened to the suction side of each refueling pump.