JPH02242797A - Vapor collecting equipment for underground tank - Google Patents

Abstract

PURPOSE:To perform unloading work of oil unless a collecting hose is correctly connected by a method wherein valve equipment is respectively provided on both ends of the collecting hose, and a valve opening mechanism, which opens the valve equipment only when the collecting hose is connected to a gas discharge pipe from an underground tank and the tank of a tank lorry, is equipped. CONSTITUTION:Valve equipment are respectively provided at both ends of a collecting hose 13, and a valve opening mechanism, which opens the valve equipment when the collecting hose 13 is connected to a gas discharge pipe 3 from an underground tank 1 and the tank of a tank lorry 7, is equipped. That is, only when the other end of the collecting hose 13 is connected to a vapor collecting port 12 on the tank of the tank lorry 7, the valve equipment on both ends of the collecting hose 13 opens, and the gas discharge pipe 3 of the underground tank 1 communicates with the inside of the tank of the tank lorry 7. Therefore, since one end of the collecting hose 13 is closed when the collecting hose 13 is not connected, the discharge gas which contains a large quantity of oil vapor from the collecting hose 13 does not disperse in the atmosphere. For this reason, unless the collecting those is correctly connected, unloading work can not be performed.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is directed to the use of air that replaces oil in an underground tank when refueling from a tank truck to an underground tank installed at a gas station or other refueling station. This invention relates to a vapor recovery device for recovering oil vapor contained in oil into the tank of a tank lorry.

[Conventional technology]

When refueling an underground tank from a tank truck, air is discharged from the underground tank in an amount equal to the volume of the oil to be refueled.

This air contains a large amount of oil vapor such as gasoline. Therefore, if this is released directly into the atmosphere, it not only poses a pollution problem to the neighborhood, but also poses a high risk of catching fire.

Therefore, when refueling an underground tank from the tank of a tank lorry, the exhaust gas from the underground tank is returned to the tank of the tank lorry using a recovery hose.
The problem can be solved (U.S. Patent No. 2904
(See specification No. 081).

FIG. 4 shows an outline of the steam recovery system. In the figure, l is an underground tank buried on the site of a gas station or other gas station, with a fuel pipe 2 and an exhaust pipe 3.
, a suction pipe 4 and a liquid level gauge 5 are attached. A refueling port 6 is provided at the ground side end of the refueling pipe 2, and is connected to a socket at the tip of a refueling hose 8 from a tank lorry 7. The exhaust pipe 3 is connected to a ventilation pipe 9 on the ground.
A vent hole 10 is provided at the tip. An automatic valve 14 is provided in the ventilation pipe 9, and is used to pump air in and out from the vent 10 when the pressure inside the underground tank 1 increases or becomes negative due to changes in atmospheric pressure or temperature. It adjusts the pressure and also shuts off the exhaust air when refueling the underground tank 1 at the time of unloading using a wind tunnel valve (Special Publication Publication No. 55
(Refer to Publication No.-29878).

A 7-shaped connecting pipe 11 is provided in the middle of the ventilation pipe 9, and a recovery hose 13 is connected between this connecting pipe 11 and a steam recovery port 12 provided in the hatch cover of the tank of the tank lorry 7. Connecting. As a result, air discharged from the underground tank 1 when unloading oil from the tank lorry 7 to the underground tank 1 is returned to the tank of the tank lorry 70 through the exhaust pipe 3, the connection pipe 111 and the recovery hose 13. Since the inside of the tank of the tank lorry vehicle 7 becomes negative pressure when unloading from the tank, the air in the underground tank 1 can be recovered without power by its suction force.

As described above, the air discharged from the underground tank 1 does not go outside during unloading, and the oil contained in the exhaust gas can be effectively recovered.

[Problem to be solved by the invention]

The above vapor recovery system is established when the worker of the tank lorry 7 correctly connects the recovery hose 13 to the connection pipe 11 and the vapor recovery port 12 of the tank lorry 7.

However, a worker accidentally opened the steam recovery port 1 of the tank truck 7.
If you neglect to connect the recovery hose 13 to 2 and unload the cargo by hanging the end of the recovery hose 13 on a firewall, etc.,
Steam in the underground tank 1 is discharged from the tip of the recovery hose 13, which is dangerous and causes pollution.

The present invention has been made in view of these circumstances, and it is an object of the present invention to make it impossible to unload the cargo unless the recovery hose is properly connected.

[Means to solve the problem]

To achieve this objective, the underground tank vapor recovery device of the present invention, when unloading oil from a tank lorry to an underground tank, collects exhaust gas from the underground tank through a recovery hose to the tank lorry. In a vapor recovery device for an underground tank connected to a tank, a valve device is provided at each end of the recovery hose, and the valve device is opened when the recovery hose is connected to an exhaust pipe from the underground tank and a tank of a tank lorry. It is characterized by being equipped with a valve opening mechanism.

〔Example〕

Hereinafter, the present invention will be specifically described based on embodiments shown in the drawings.

Figure 1 shows the connection fittings 2 attached to both ends of the recovery hose 130.
FIG. 2 is a partially cutaway side view showing 0; In the same figure, 21 is a valve stem supported in the connection fitting 20 so as to be able to move up and down,
A valve plate 22 is fixed to this. The connecting fitting 20 is formed with a valve v23 that the valve plate 22 contacts. The valve plate 22 is normally pressed against the valve seat 23 by a spring 25 whose upper end is supported by a spring receiver 24, and is maintained in a closed state. In the figure, 26 is a rubber gasket, and 27 is an O-ring.

FIG. 2 is a partially cutaway side view of a connecting pipe 11 provided in the middle of the ventilation pipe 9 shown in FIG. 4 and a socket attached to the steam recovery port 12 of the tank lorry 7. In the figure, socket body 30.・1 has a valve stem 3 that can freely move up and down
1 is supported, and a valve plate 32 is fixed to this. The socket body 30 has a valve seat 3 on which the valve plate 32 abuts.
3 is formed. The valve plate 32 has a spring receiver 34
A spring 35 whose lower end is supported by a spring 35 is normally in pressure contact with the valve seat 33 to keep the valve closed. Note that 37 is an auxiliary spring that pushes up the valve stem 31. Further, 40 is a cap that is placed over the socket main body 30 during normal operation, and is stopped by a latch 36.

The connection fitting 20 is attached to the socket main body 30 having the above configuration at the time of refueling. FIG. 3 shows this state. When the connecting fitting 20 is pushed in, the valve stem 2 of the connecting fitting 20
1 and the tip of the valve stem 31 of the socket body 30 collide, overcoming the elasticity of the spring 25.35 and separating the valve plate 22.32 from the valve seat 23.33. A stopper 21a is provided on the valve plate 21 to ensure that both valve plates 22 and 32 are opened.

In this way, the recovery hose 13 has connection fittings 2 at both ends.
0 is provided, the recovery hose 13 is connected to the connection pipe ll.
If it is only attached to the side socket body 30, the valve device of the connection fitting at the other end of the recovery hose 13 is closed, so that the exhaust from the underground tank 1 cannot be discharged from the other end of the recovery hose 13. Only when the other end of the recovery hose 13 is connected to the steam recovery port 12 of the tank of the tank lorry car 7, the valve devices at both ends of the recovery hose 130 are opened, and the exhaust pipe 3 of the underground tank 1 and the tank of the tank lorry car 7 are opened. The inner and outer lines will be opened.

〔Effect of the invention〕

As explained above, in the present invention, valve devices are provided at both ends of the recovery hose, and the valve devices are opened when the recovery hose is connected to the exhaust pipe from the underground tank and the tank of the tank lorry. Equipped with a valve opening mechanism.

As a result, since one side of the recovery hose is closed when the recovery hose is not connected, exhaust gas containing a large amount of oil vapor from the recovery hose will not be dissipated into the atmosphere, and the vapor recovery equipment in the underground tank can be used as intended. This will greatly contribute to pollution prevention and accident prevention.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view showing an embodiment of a connecting fitting according to the present invention, Fig. 2 is a partially cutaway sectional view showing an embodiment of a socket according to the present invention, and Fig. 3 is a connecting fitting and a socket. FIG. 4 is a partially cutaway side view showing the connection state of the steam recovery system. l: Underground tank 2: Fuel supply pipe 3: Exhaust pipe 4: Suction pipe 5: Level gauge
6 = Oil supply lower: Tank lorry vehicle 8: Fuel supply hose 9: Ventilation pipe
10: Vent port 11: Connection pipe 12: Steam recovery port 13: Recovery hose 14: Automatic valve 20: 22: 24: 26 = 30: 32: 34: 36: 40: Connection fitting Valve plate Spring receiver is rubber packing socket body The valve plate spring receiver is latch cap 21: valve stem 23: valve seat 25 spring 27: O-ring 31: valve stem 33: valve seat 35 spring 37: auxiliary spring Fig. 4

Claims (1)

[Claims] 1. When unloading oil from a tank truck to an underground tank, in an underground tank vapor recovery device that connects the exhaust air from the underground tank to the tank of the tank truck via a recovery hose, a steam recovery device is installed at both ends of the recovery hose. A vapor recovery device for an underground tank, characterized in that each valve device is provided, and a valve opening mechanism opens the valve device when the recovery hose is connected to an exhaust pipe from the underground tank and a tank of a tank truck. .