JPS5910073Y2 - Refueling device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for pumping up oil from a fuel tank and refueling an automobile or the like with it.

Conventionally, in this type of refueling system, a pit has been provided below the main body of the refueling machine to provide space for connecting the oil pump and the refueling pump, or to store the refueling pump, flow meter, etc. It is provided.

On the other hand, the oil storage tank is designed so that atmospheric air can be introduced into the tank by the negative pressure generated when the oil in the tank decreases during refueling, thereby allowing smooth refueling.

However, there are several problems with such conventional oil supply devices.

That is, oil vapor, which has a higher specific gravity than oil or air, may accumulate in the pit due to equipment damage or poor connections within the main body of the refueling machine.

This oil vapor, for example, in the case of gasoline, is extremely dangerous, and there is a high risk of ignition and explosion due to a small spark.

Therefore, it has been proposed to return the oil vapor in the pit to the oil storage tank using a blower, etc., but there are problems such as the need for an explosion-proof structure for the blower motor, wear of the rotating parts, and problems with motor control. .

That is, since it is not preferable to keep the motor operating all the time, a complicated mechanism and circuit are required to operate the motor while paper is present or for a certain period of time using a timer.

Another problem is the inflow of air into the storage tank from the vent pipe during refueling.

This inflow of air (atmospheric air) dilutes the vapor in the space within the oil storage tank, and therefore the oil in the tank evaporates until it is further saturated.

This is a loss of oil and is uneconomical.

This invention provides a refueling device that solves the above-mentioned conventional problems.

That is, the refueling device of this invention has a connecting pipe connecting the pit and the ventilation pipe, and a check valve is interposed in this pipe, so that the oil vapor accumulated in the pit is returned to the oil storage tank through this connecting pipe. In addition to this, a special valve mechanism is installed in the vent pipe to effectively introduce atmospheric air into the oil storage tank through the vent pipe.

The illustrated embodiment will be described below.

In the figure, PU is a refueling machine body installed on the ground, which is equipped with a refueling pump 5, a flow meter 7, etc., and pumps up oil O in an oil storage tank 1 through a pumping pipe 2, and refuels through a hose 8. The nozzle 9 refuels an automobile or the like (not shown).

6 is a motor that drives the refueling pump 5; 11 is a display that receives the output from the flow meter 7 and displays the refueling amount; 10 is a nozzle case that houses the refueling nozzle 9; 3 is a pumping pipe 2.
This is a flexible pipe that connects the oil supply path 4 and the oil supply path 4.

P is a pit provided below the refueling machine main body PU.

Reference numeral 12 denotes a vent pipe that communicates the oil storage tank 1 with the atmosphere, and introduces the atmosphere into the oil storage tank 1 through a vent port 12' at the upper end.

If necessary, steam in the oil storage tank 1 is discharged via this vent pipe 12.

Note that 13 is an oil supply pipe for supplying oil to the oil storage tank 1 from a tank truck (not shown) or the like, and 13' is an oil supply port thereof.

Moreover, F is a flammability prevention net. In this invention, in the above structure, a communication pipe R is provided that connects the pit P and the ventilation pipe 12, and a valve having a special valve mechanism built in is provided at the connection part of the communication pipe R with the ventilation pipe 12. A case ■ is provided.

That is, the valve case ■ is made up of three case parts V 1 , V 2 , and V 3 integrally combined as shown in FIG. 2, and the case parts ■ 1 and ■ 3 are connected to the vent pipe 12. .

Two flow passage ports L1 and L2 are formed in the case part ■1, the flow passage port L1 constitutes a part of the ventilation pipe, and the other flow passage port L2 is connected to the communication pipe R. .

A light spherical check valve K made of plastic, for example, is disposed at the flow passage port L2, and is designed to allow only flow into the valve case V from the passage pipe R side.

Therefore, when oil vapor accumulates in the pit P and the level of oil O in the oil storage tank 1 decreases during refueling, the check valve K operates to open the pipe (flow path), and the oil vapor in the pit P drops. Oil vapor is drawn into the oil storage tank 1.

Note that if the pipe line R is provided with a slight slope (upward to the right in FIG. 1), it is possible to prevent the pipe line R from being blocked by the condensed liquid.

A double valve mechanism is installed in the case part (2), which are combined so that the regulated flow directions are opposite to each other.

This valve mechanism is composed of valves A and B, and the oil storage tank 1
When the pressure inside the tank 1 is within a certain range, the flow path of the ventilation pipe 12 is closed, and when the pressure inside the tank 1 is below the lower limit or above the upper limit of the range, the flow path of the ventilation pipe 12 is opened. do.

That is, valve A is normally urged to close by spring S, but for some reason check valve K does not operate, and the pressure inside oil storage tank 1 decreases to a constant pressure value (check valve It is designed to open when the pressure becomes lower than the expected opening operation pressure value of K.

On the other hand, when the pressure inside the oil storage tank 1 increases and exceeds a certain pressure value due to oil filling from a tank truck, etc., valve B
opens the flow path against the bias of spring S2.

By such operation of the valve mechanism, the function of the vent pipe 12 is maintained, and moreover, the oil vapor from the pit P can be smoothly recovered through the communication pipe R.

The invention is not limited to the illustrated embodiment.

Various modifications to the installation position and structure of the check valve interposed in the communication pipe R are possible.

The same applies to the valve mechanism installed in the flow path of the ventilation pipe.
The valves A and B may be provided separately instead of having a heavy structure.

Further, instead of valve A, a small hole that communicates both sides of valve B may be provided in valve B or at a suitable location.

Furthermore, the present invention can be applied to not only the ground-mounted refueling device but also the ceiling-suspended type.

Since the oil supply device of this invention is as detailed above,
It is safe and there is no risk of explosion due to oil vapor accumulating in the pit.

This oil vapor is collected in the oil storage tank, and it is also possible to prevent the oil in the oil storage tank from evaporating, which is economical.

Another major advantage is that oil vapor in the pit can be recovered without the need for special power.

Furthermore, according to this invention, if the oil vapor released into the atmosphere from the fuel tank of an automobile or the like during refueling is guided to this pit, it can contribute to energy conservation by preventing air pollution and pollution.

When the main body of the oil feeder is installed in the pump room, its effects are extremely significant, such as the fact that oil vapor accumulated on the floor of the pump room can also be recovered.

[Brief explanation of drawings]

FIG. 1 is a diagram schematically showing the structure of an embodiment of this invention.
FIG. 2 is an enlarged longitudinal sectional view of the main part. 1... Oil storage tank, 2... Oil handling pipe, 5... Oil supply pump, 6... Motor, 7... Flow rate Total, 9...Refueling nozzle,
PU...Refueling machine main body, P...Pit, R...Connection pipe, 12...Vent pipe, ■
...Valve case, ■1, ■2, V3...
Case part, A, B... Valve, K... Check valve, L1, L2... Channel opening, S1, S2...
...Spring, 13...Oil pipe.

Claims (1)

[Scope of utility model registration request] When the internal pressure of the oil storage tank drops below atmospheric pressure, the pit provided below the main body of the refueling machine installed on the ground and the ventilation pipe led out from the oil storage tank are opened by the oil storage tank internal pressure, and the pit and the oil storage tank are opened. The tank is connected via a normally closed check valve that communicates with the tank, and the ventilation pipe from this connection to the vent is connected to the tank when the internal pressure of the oil storage tank exceeds a certain value or when the check valve is opened. A refueling device characterized in that it is also equipped with a normally closed valve mechanism that is opened by the internal pressure of the oil storage tank to communicate the oil storage tank and the vent when the pressure drops below the expected operating pressure.