JPH0723182B2 - Vapor recovery device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a vapor (gasoline vapor) recovery device provided in, for example, a fuel filling station of an automobile.

[Conventional technology]

When refueling a fuel tank of an automobile, vapor flows out from the fuel tank, but this vapor is highly flammable and dangerous, so if it is released into the atmosphere as it is at the refueling point, which is a dangerous place, , It may lead to a great danger such as fire.

Therefore, at the gas station, in order to process the vapor, a vapor processing device is attached to the fuel dispenser to process the vapor or return the vapor to an underground oil storage tank.

By the way, in the case of the latter return method to the underground tank,
Conventionally, for example, as shown in Japanese Patent Application No. 49-65802 (Japanese Utility Model Publication No. 50-153515) and Japanese Patent Publication No. 57-33239,
The pipe connecting the fueling nozzle and the underground tank was specially buried in the ground for vapor return.

[Problems to be Solved by the Invention]

Therefore, it is not only necessary to prepare a separate pipe for vapor return, but also a large amount of money and days are required for the burying work of the pipe, and it is impossible to install it at an existing gas station where the ground surface is covered with concrete. Was close to

An object of the present invention is to solve the above-mentioned disadvantages of the conventional example, and to provide a vapor recovery device that can easily and inexpensively install a vapor recovery pipe by using an oil supply pipe provided in an oil supply device.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention has a fuel supply pump and a flowmeter sequentially arranged in the middle of a fuel supply pipe communicating with an underground oil storage tank, and a fuel supply hose having a fuel supply hose having a fuel supply nozzle at the end thereof is connected to the fuel supply pipe. In the vapor recovery device in the device, a branch pipe having a branch pipe that obliquely protrudes is provided in the middle of the oil supply pipe on the inflow side of the oil supply pump, and a blower is provided in the middle of the vapor recovery pipe whose one end is opened near the tip of the nozzle valve. The gist is that the end is inserted into the oil supply pipe through the branch pipe, the vapor recovery pipe is further led out into the underground oil storage tank and then opened, and the vapor recovery pipe and the branch pipe are sealed with packing. .

[Action]

According to the present invention, while the gasoline is discharged from the nozzle valve, the evaporation of the gasoline flowing out from the nozzle valve is caused by the blower provided in the vapor recovery pipe exposed to the outside of the oil supply pipe in the oil supply device, and the nozzle valve tip It is sucked into the vapor recovery pipe opened in the vicinity and is discharged into the space inside the underground oil storage tank through the vapor recovery pipe.

Since the tip of the branch pipe is closed by the packing, the vapor recovery pipe can be branched so as to bypass the oil supply pipe in which the flow meter and the oil supply pump are disposed without leaking the vapor into the oil supply device. .

Thus, 30 to 40% of the gasoline vapor discharged into the underground oil storage tank is liquefied in the tank, and the rest passes through the air vent opened here to open to the non-hazardous area in the gas station. It is released into the atmosphere from the tip of the air vent.

As described above, by using the oil supply pipe provided in the oil supply device, it is possible to install the vapor return pipe at a low cost without burying it separately, and thus it is possible to easily install it in the existing oil supply device.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a vertical sectional front view of an oil supply device provided with a vapor recovery pipe according to the present invention, and FIG. 2 is a vertical sectional front view showing an oil supply pipe portion. In the figure, reference numeral 1 denotes a ground-fixing type fueling machine, and the fueling machine 1 starts up a fueling pipe 4 which opens in the vicinity of the bottom of an underground oil storage tank in a fueling machine case 1a standing upright on an island 2 as is well known in the art. , A refueling pump 5 and a flow meter 6 are sequentially provided in the middle of the refueling pipe 4, and the refueling pump 5 has a motor 7
Refueling amount indicator 8 for connecting the and displaying the measured value of the flow meter 6
Is provided.

The end of the oil supply pipe 4 is connected to an oil supply hose 9 arranged outside the case 1a, and a nozzle valve 10 is provided at the tip of the oil supply hose 9.
And also provided with a nozzle hook 11 on the side of the case 1a,
In the vicinity thereof, a nozzle switch 12 that interlocks with the engagement / disengagement of the nozzle valve 10 is provided.

On the other hand, a lower end of an air vent 13 communicating with the atmosphere is opened in the underground oil storage tank 3. In the figure, 21 is a supply port to the oil storage tank 3.

The vapor recovery device of the present invention in such an oil supply device is equipped with an umbrella-shaped vapor recovery nozzle 14 near the tip of the nozzle valve 10 so as to cover it, and a vapor recovery pipe connected to the vapor recovery nozzle 14. Nozzle valve 15
After being provided along the outside of the oil supply pipe 10, the oil supply hose 9 was inserted and led out into the oil supply pipe 4 in the oil supply machine case 1a.

In the refueling machine case 1a, a branch pipe 16 is provided to the refueling pipe 4 in order to bypass each device such as the refueling pump 5 and the flow meter 6.
a and 16b are provided. As shown in FIG. 2, the branch pipes 16a and 16b have a branch pipe 17 projecting from the oil supply pipe 4 and a tip end thereof filled with packing 17a.
The branch pipe 16 is installed in the existing refueling machine.
When a and 16b are provided, a part of the oil supply pipe 4 should be cut and removed, and then attached here. In addition, in the case of a new oil supply machine, in addition to that, part of the oil supply pipe 4 It is also possible to integrally project the branch pipe 17 from the.

The vapor recovery pipe 15 inserted into the oil supply pipe 4 is led out to the outside of the oil supply pipe 4 through the branch pipe 17 at the branch pipe 16a portion arranged on the outflow side of the flowmeter 6, and the inflow of the oil supply pump 5 is performed. It is inserted into the branch pipe 17 at the branch pipe 16b arranged on the side and is inserted again into the oil supply pipe 4.

In order to bypass each device such as the flow meter 6 in this way, a blower 18 is provided in the middle of the vapor recovery pipe 15 exposed outside the oil supply pipe 4.
And a vapor recovery pipe reinserted into the oil supply pipe 4
The tip of 15 was led out from the end of the oil supply pipe 4 which opens near the bottom of the underground oil storage tank 3, and was further drawn upward to project and open into the upper space of the underground tank 3.

To arrange this vapor recovery pipe 15 in the pipe 4,
When the recovery pipe 15 is pushed in from 17, the flexible recovery pipe 15 advances along the bent pipe 4, is led out into the underground tank 3, and can be easily arranged.

FIG. 3 is a drive circuit diagram, in which the motor 7 of the refueling pump 5 and the nozzle switch 12 are connected in series, the blower motor 19 and the detector 22 for detecting refueling are connected in series, and these are connected to the power supply 20. .

Next, the usage and operation will be described. To refuel, if the nozzle valve 10 is removed from the nozzle hook 11, the nozzle switch 12 is closed and the motor 7 rotates to enable refueling.

Next, when the nozzle valve 10 is inserted into the fuel filler port of the automobile to refuel, the flow meter 6 rotates, the detector 22 closes, and the blower motor 19 rotates. While the gasoline is discharged from the nozzle valve 10, the evaporation of the gasoline flowing out from the nozzle valve 10 is sucked into the vapor recovery pipe 15 from the vapor recovery nozzle 14 by the action of the blower 18, and passes through the vapor recovery pipe 15 to the underground oil storage tank. It is released to the space inside 3.

In addition, since the tip of the branch pipe 17 is closed by the packing 17a, the vapor is collected so as to bypass the oil supply pipe 4 in which the flow meter 6 and the oil supply pump 5 are arranged without leaking the vapor into the oil supply case 1a. The tube 15 can be branched.

At this time, since the gasoline vapor is sucked and sent by the blower 18 as described above, a thin vapor recovery pipe 15 can be used, and the fuel supply hose 9 through which the gasoline flows can be used.
Even if the vapor recovery pipe 15 is inserted therein, the amount of gasoline discharged will be slightly reduced and will not cause a great obstacle. Further, since the fuel supply pipe 4 is relatively thick, even if the vapor recovery pipe 15 passes through this inside, it does not hinder the discharge of gasoline. Further, since the vapor recovery pipe 15 is not exposed to the outside of the refueling hose 9 and can be handled integrally, it does not interfere with the operation during refueling work.

Thus, 30-40% of the gasoline vapor discharged into the underground oil storage tank 3 is liquefied in the tank 3, and the rest passes through the air vent 13 opened here, and is in a non-hazardous area in the gas station. It is discharged into the atmosphere from the tip of the air vent 13 which is opened in the.

When refueling is complete, the detector 22 opens and the blower motor 19
Will stop and will not send excess air to the underground tank. Pull out the nozzle valve 10 from the filler port and hook it up with the nozzle.
When it is returned to 11, the nozzle switch 12 is opened, the power supply to the motor 7 is cut off, and the motor 7 and the oil supply pump 5 are stopped.

In the above, the example in which the vapor recovery pipe 15 is inserted through the fuel supply hose 9 has been described, but as another embodiment, as shown in FIG. 4, the vapor recovery pipe 15 may be arranged along the fuel supply hose 9. . In this case, since the vapor recovery pipe 15 does not pass through the fuel supply hose 9, the gasoline discharge amount does not decrease. Moreover, since the vapor recovery pipe 15 is thin, even if it is exposed to the outside, it does not affect the flexibility of the refueling hose 9 and does not hinder the refueling work.

〔The invention's effect〕

As described above, in the vapor recovery device of the present invention, since the vapor recovery pipe is arranged in the oil supply device by utilizing the oil supply pipe that is always provided in the oil supply device, an embedded pipe of the vapor recovery pipe is prepared separately. There is no need to embed.

Therefore, even in the existing refueling device, it is a simple construction that only replaces the refueling pipes on the outflow side of the flow meter and the inflow side of the refueling pump with the branch pipes and installs the vapor recovery pipes, without impairing the refueling function. It can be installed at any location, and its overall structure is simple and installation costs are low.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an oil supply apparatus provided with a vapor recovery pipe in the apparatus of the present invention, FIG. 2 is a vertical sectional front view showing the same oil supply pipe portion, FIG. 3 is a blower drive circuit diagram, and FIG. It is a vertical front view showing other examples of the present invention. DESCRIPTION OF SYMBOLS 1 ... Refueling machine, 1a ... Refueling machine case 2 ... Island, 3 ... Underground oil storage tank 4 ... Refueling piping, 5 ... Refueling pump 6 ... Flowmeter, 7 ... Motor 8 ... Refueling amount indicator, 9 ... Refueling hose 10 ... Nozzle Valve, 11 ... Nozzle hook 12 ... Nozzle switch, 13 ... Air vent 14 ... Vapor recovery nozzle, 15 ... Vapor recovery pipe 16a, 16b ... Branch pipe, 17 ... Branch pipe 17a ... Packing, 18 ... Blower 19 ... Blower motor, 20 ... Power supply 21 ... Replenishment port, 22 ... Detector

Claims (1)

[Claims] 1. A vapor recovery device in a refueling device in which a refueling pump and a flow meter are sequentially arranged in the middle of a refueling pipe communicating with an underground oil storage tank, and a refueling hose having a refueling nozzle at the tip is connected to the end of the refueling pipe. In the above, a branch pipe having an obliquely projecting branch pipe is provided in the middle of the oil supply pipe on the inflow side of the oil supply pump, a blower recovery pipe having one end opened near the tip of the nozzle valve is provided with a blower, and the other end is provided with a branch pipe. A vapor recovery device, characterized in that the vapor recovery pipe is inserted into the oil supply pipe via the above, the vapor recovery pipe is introduced into the underground oil storage tank and then opened, and the vapor recovery pipe and the branch pipe are sealed with packing.