JP2021130474A - Oil mixing prevention device - Google Patents

Abstract

To provide an oil mixing prevention device capable of preventing an inflow of fuel oil to an underground tank until a coincidence of the oil type is verified when an unloading hose is connected with an oil pouring pipe of the underground tank.SOLUTION: An oil mixing prevention device comprises an oil pouring port 4 including a valve body 5 arranged at an oil pouring pipe 3 leading into an underground tank and closing an inflow passage of fuel oil and a detection part recognizing the fuel oil at an upstream side of the valve body 5, and oil type determination means deciding the oil type based on an output from the detection part 14 of the oil pouring port 4.SELECTED DRAWING: Figure 1

Description

It is to provide a device capable of determining the oil type when replenishing fuel oil to an oil storage tank such as an underground tank of a gas station and preventing lubrication of different oil types.

The tank mounted on the tank lorry is divided into a plurality of hatches, and fuel oil of a predetermined oil type is loaded into each hatch according to the order of the gas station and delivered to the gas station by the tank lorry.
Then, at the gas station found in Patent Document 1, the fuel oil loaded is unloaded to each underground tank buried underground while preventing oil mixing via a unloading hose.

By the way, there are multiple types of fuel oil to be unloaded into the underground tank, and an accident in which a fuel oil of a different type from the fuel oil in the underground tank is unloaded, for example, kerosene mixed with gasoline or gasoline is mistakenly used for kerosene. If the fuel oil in the underground tank is unloaded, the fuel oil in the underground tank cannot be used, resulting in a large economic loss.

Not only that, gasoline is easier to vaporize than kerosene and burns explosively, so if kerosene mixed with this gasoline is used in a stove or the like, it will lead to a major accident such as a fire.

Therefore, as seen in Patent Document 1, the capacity and oil type of each oil storage tank are stored, the amount of oil calculated from the liquid level signal of the oil level gauge provided in the oil storage tank, and the order amount input from the keyboard. An oil amount management device on the refueling station side having a storage unit for storing the oil, a control unit for outputting order data including the tank number, the oil type, and the order amount, and cargo data including the oil type and the oil amount for each hatch. Consists of a unloading control device on the tank lorry side having a storage unit for storing the input order data and a control unit for controlling unloading based on the cargo data, the order data, and the unloading tank number. What has been proposed.
However, if the bottom valve of the tank truck is opened, there is a problem that different types of fuel oil flow into the oil storage tank and mixed oil cannot be reliably prevented.

Japanese Unexamined Patent Publication No. 2000-128299

Japanese Unexamined Patent Publication No. 2010-91328

The present invention has been made in view of such a problem, and an object of the present invention is to fuel the underground tank until it can be confirmed that the oil types match when the unloading hose is connected to the lubrication pipe of the underground tank. It is an object of the present invention to provide an oil mixture prevention device capable of reliably blocking the inflow of oil and making an oil mixture determination.

In order to solve such a problem, the present invention comprises a valve body arranged in a lubrication pipe leading to an underground tank to open and close the inflow path of fuel oil, and a detection unit for discriminating fuel oil on the upstream side of the valve body. And an oil type determining means for determining the oil type based on the output from the detection unit of the oiling port.

Before the fuel oil flows into the lubrication pipe, the valve body is dammed to determine the oil type, and only when the oil types match, the valve body is opened and unloading is performed to the underground tank.

FIG. 5 is a cross-sectional view showing an embodiment of the oil mixing prevention device of the present invention in a valve closed state. The figure which shows the valve body in a closed state. The figure which shows the valve body in a non-closed state. The figure which shows in the valve open state which shows one Example of the foot valve. The figure which shows one Example of the foot valve in a closed state.

Therefore, the details of the present invention will be described below with reference to the illustrated examples.
FIG. 1 shows an embodiment of the oil mixing prevention device of the present invention, in which a valve body is located on the connection port of the lubrication pipe 3 connected to the discharge port 2 of the unloading hose 1, that is, on the immediate downstream side of the lubrication port 4. 5. In this embodiment, a butterfly valve is arranged.

On the upstream side of the valve body 5, a vapor exhaust port 6 is formed in the upper part of the flow path, and a waste oil recovery port 7 is formed in the lower part. A vapor recovery pipe 9 is connected to the vapor exhaust port 6 via a foot valve 8, and a drain pipe 12 communicating with a waste oil recovery port 7 via a stop valve 11 is connected to the fuel oil recovery container or the corresponding. It communicates with the pipe 13 of the underground tank of the oil type. The vapor recovery pipe 9 can communicate with the space of the oil storage tank or the vapor exhaust pipe, or can be opened to the atmosphere.

Further, a liquid analysis sensor 14 is arranged on the upstream side of the valve body 5, and in this embodiment, an optical sensor as described in, for example, Patent Document 2 is arranged. That is, a light-shielding plate 16 is provided on the upstream surface of the valve plate 15 of the butterfly valve 5 so as to be perpendicular to the light-shielding plate 16 for passing light so as to be located in the optical path L of the optical sensor 14. The through hole 17 is bored.

As shown in FIG. 2, the light emitting means 18 and the light receiving means 19 constituting the optical sensor, which is the liquid analysis sensor 14, face the through hole 17 of the light shielding plate 16 when the butterfly valve 5 is securely closed. It is arranged so as to form a light receiving relationship.
As a result, the opening and closing of the valve body 5 can be reliably detected, and the unloading is performed after confirming that the valve body 5 in the lubrication port is closed before unloading to the underground tank. Even if the bottom valve on the side is opened by mistake, it is possible to prevent the oil from being unloaded before the oil type is determined.

In this embodiment, after confirming that the valve body 5 of the lubrication pipe 3 of the underground tank to be replenished with fuel oil and the valve 11 of the waste oil recovery port 7 are securely closed, the unloading hose 1 is connected to the lubrication pipe 3 It is connected to the lubrication port 4 which is the connection port of. Then, the start button is used to command the start.

In this embodiment, in the valve closed state, the through hole 17 of the light shielding plate 16 faces the optical path L of the light emitting means 18 as shown in FIG. 2, and the position of the valve plate 15 is perfect as shown in FIG. When the valve is deviated from the closed state, the through hole 17 deviates from the optical path L of the optical sensor, so that the light is shielded by the light shielding plate 16. As a result, the output of the light receiving means 19 changes greatly depending on the open / closed state of the butterfly valve 5.
It should be noted that the determination of the closed state of the butterfly valve 5 and the determination of the oil type by the signal of the light receiving means 19 can be configured by a microphone port computer constituting the oil type determining means (not shown).

After checking the oil type, when the bottom valve of the tank lorry is opened, the fuel oil of the tank lorry flows into the lubrication port 4 of the lubrication pipe 3 via the unloading hose 1, and the gas such as air and vapor existing here flows to the upper part. The fuel is discharged from the vapor exhaust port 6 of the above via the foot valve 8 and the vapor recovery pipe 9.

That is, as shown in FIG. 4, while only the gas such as vapor passes through the vapor exhaust port 6, the fuel port 20 is lowered and the valve portion 21 is separated from the valve seat 22 and is in a communicating state. However, when the fuel oil flows in, the foot port 20 rises and the valve portion 21 abuts on the valve seat 22 to close the passage. As a result, the optical path of the liquid analysis sensor 14 can be surely passed through the fuel oil without leaking the fuel oil, and the oil type can be determined in a characteristic manner.

That is, fuel oil is stored on the upstream side of the valve body 5 and the liquid analysis sensor 14 is operated to determine the oil type. When it is confirmed that the oil types match, the valve body 5 is opened via the lever 23 to execute unloading.

On the other hand, if the matching of the oil types cannot be confirmed, the bottom valve of the tank lorry is closed and then the release valve 11 is opened to communicate the fuel oil accumulated between the tank lorry and the lubrication pipe to the fuel oil recovery container. It is discharged to the pipe 12.
Further, when the oil type is, for example, pure regular gasoline, the oil is discharged to the lubrication pipe 13 leading to the corresponding underground tank.
As a result, different types of fuel oil accumulated in the piping downstream of the bottom valve of the lorry and in the unloading hose 1 can be safely recovered without removing the unloading hose 1.

In the above embodiment, the butterfly valve is used for the connection port of the lubrication pipe 3 with the unloading hose, but it is clear that another type of valve, for example, a ball valve, can also be used.
Further, in the above-described embodiment, the valve opening / closing is detected by using the liquid analysis sensor, but it goes without saying that the same effect can be obtained even if the valve opening / closing detection means is provided independently.

Even if the bottom valve of the tank truck is accidentally opened before the oil type is determined, not only can it be blocked by the lubrication pipe of the underground tank, but also the fuel oil of a different oil type accumulated in the lubrication pipe can be reliably recovered. Further, since the opening / closing of the valve body can be detected by the sensor, it is possible to notify when the valve body 5 is opened contrary to the output from the oil type determining means.

That is, if the valve body 5 is opened by an operator's mistake after it is determined to be different from the oil type determination, it is possible to notify the valve body 5, so that a fire accident due to mixed oil can be reliably prevented.

1 Unloading hose 2 Unloading hose discharge port 3 Lubrication pipe 4 Lubrication port 5 Valve body 6 Vapor exhaust port 7 Waste oil recovery port 8 Foot valve 9 Vapor recovery pipe 11 Stop valve 12 Pipe that communicates with fuel oil recovery container 14 Liquid Analytical sensor 15 Valve plate 16 Light-shielding plate 17 Communication hole

Claims (5)

A valve body that is arranged in the lubrication pipe leading to the underground tank and opens and closes the inflow path of fuel oil.
A lubrication port provided with a detection unit for discriminating fuel oil on the upstream side of the valve body, and
An oil mixing prevention device including an oil type determining means for determining an oil type based on an output from a detection unit of the lubrication port. The oil mixing prevention device according to claim 1, wherein bypass paths are formed in the upper portion and the lower portion of the valve body upstream. The oil mixing prevention device according to claim 2, wherein a foot valve is provided in the bypass path connected to the upper side. The oil mixing prevention device according to claim 2, wherein a drain pipe for discharging waste oil is provided in the bypass path connected to the lower side. The oil mixing prevention device according to claim 1, further comprising an opening / closing detecting means for detecting the opening / closing of the valve body.

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