JP2506026Y2 - Underground tank vapor recovery device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of Industrial Application The present invention relates to a device for recovering vapor discharged from a tank when a liquid such as gasoline is injected into an underground tank installed in a gas station or the like.

(2) Conventional technology Conventionally, a required valve element that closes the opening side of the exhaust pipe during work is formed above the connecting part of the gas reduction pipe provided in the middle of the exhaust pipe from the underground tank (Japanese Patent Publication No. 53). -8043)
Also known are those in which a valve element is formed on the ventilation pipe and the gas recovery hose side (JP-B-53-27483) and (JP-B-55-29878).

(3) Problems to be solved by the invention However, all of the above are composed of a movable valve element, and strictly speaking, the Fire Service Act (Regulation No.
It has a structure that cannot form the valveless ventilation structure specified in Article 20, Paragraph 3).

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a safe and inexpensive vapor recovery device which complies with the Fire Defense Law and which can completely recover gas during replenishment with a simple structure.

(4) Means for Solving the Problems In order to achieve the above-mentioned object, the present invention forms a first cylindrical portion having a diameter larger than that of the ventilation pipe in the middle portion of the ventilation pipe standing from the underground tank. A second cylindrical portion having a small diameter and having a lid, which is connected to the underground tank side of the ventilation pipe, is provided in the first cylindrical portion, and a first circular hole is formed on a side surface of the first cylindrical portion and a second cylindrical portion is formed on a side surface of the second cylindrical portion. The two circular holes are formed on the same line, the first circular hole is fitted and the connecting pipe fitted to the second circular hole so as to come into contact with and separate from the second circular hole is connected to the tip of the vapor recovery hose, and the first circular hole is formed. The circular hole is provided with a lid for sealing the first circular hole.

(5) Function When the liquid is not replenished, the vapor is passed through the second circular hole of the second cylindrical portion with the lid attached to the first circular hole and passes through the second circular hole of the second cylindrical portion. When replenishing the liquid, the connecting pipe is inserted into the first circular hole and fitted into the second circular hole, and the vapor is replenished from the second cylindrical portion through the connecting pipe and the recovery hose during replenishment of the liquid.

(6) Embodiment Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3.

(1) shows an underground tank, a ventilation pipe (2) is provided upright in the underground tank (1), and a vapor recovery device (3) is provided in an intermediate portion of the ventilation pipe (2). There is. That is, the vapor recovery device (3) is provided with the large diameter first cylindrical portion (3a) connected to the ventilation pipe (2), and the upper surface is closed inside the first cylindrical portion (3a). A second cylindrical portion (3) having a small diameter whose lower end is connected to the underground tank side of the ventilation pipe (2).
b) and the first cylindrical portion (3a) and the second cylindrical portion (3
On the side wall of b), a first circular hole (3c) and a second circular hole (3d) which are concentric with each other are formed on the same line, and the connecting pipe (4) connected to the tip of the vapor recovery hose (9) is formed. ) Is fitted in the first circular hole (3c) and is fitted in the second circular hole (3d) so as to come into contact with and separate from the second circular hole (3d).

(4a) is a collar body that projects from the intermediate portion of the connection tube (4) and restricts excessive fitting and insertion of the connection tube (4), (4b) ... (4b) is the tip side of the collar body (4a). A small hole formed in the peripheral surface of the connecting pipe (4), (5) a tank truck for closing the first circular hole (3c), and a refueling hose (8).

Next, the operation of the first embodiment having the above configuration will be described.
For example, when the gasoline is not being replenished, the lid (5) is attached to the first circular hole (3c) as shown in the second illustration, and the underground tank (1) is attached.
The vapor generated inside is discharged upward from the second circular hole (3d) of the second cylindrical portion (3b) through the ventilation pipe (2). Therefore, it acts as a valveless ventilation pipe and conforms to the valveless ventilation pipe specified by the Fire Service Law.

Next, for example, when replenishing gasoline to the underground tank (1) with the tank truck (7), the refueling hose (8) is connected to the underground tank (1) and the lid body (5) of the vapor recovery device (3) is removed. Then, the connecting pipe (4) is fitted into the second circular hole (3d) through the first circular hole (3c) to replenish the gasoline. At this time, the underground tank (1) and the tank truck (7) are connected via an oil supply hose (8), a ventilation pipe (2), a vapor recovery device (3), and a vapor recovery hose (9) to form an underground tank. The vapor generated in (1) is immediately recovered through the connection pipe (4) and the vapor recovery hose (9) as shown in FIG. 3, and the inside of the tank truck vehicle (7) is decompressed, so that the suction action works. A small amount of air is taken in through the small holes (4b) ... (4b) formed in the peripheral surface of (4).

However, when an abnormal pressure is generated in the underground tank (1), the vapor of the abnormal pressure is generated in the small hole (4b) ...
It is released into the atmosphere through the ventilation pipe (2) via (4b).

FIG. 4 shows a second embodiment of the present invention, in which safety valves (10) ... (10) are provided outside the small holes (4b) ... (4b) of the connecting pipe (4) to prevent air from entering the vapor during replenishment. Prevents mixture and when abnormal pressure occurs in the underground tank (1), the safety valves (10) ... (10) are opened by the abnormal pressure so that the vapor is released from the ventilation pipe (2) into the atmosphere. did.

FIG. 5 shows a third embodiment of the present invention, wherein the second cylindrical portion (3b) is provided.
A safety valve (11) that opens when an abnormal pressure is generated is provided on the lid of the upper surface of the device to prevent the mixing of air during replenishment and release the abnormal pressure.

FIG. 6 shows a fourth embodiment of the present invention in which a part of the peripheral wall of the second cylindrical portion (3b) is shared with a part of the peripheral wall of the first cylindrical portion and a nut (12) is attached to the connecting pipe (4). Attach, and project a short cylinder (13) with a thread (13a) on the outer periphery at the periphery of the first circular hole (3c), and fit the connecting pipe (4) into the circular holes (3c) (3d). The connection pipe (4) is surely screwed by screwing the nut (12) to the screw thread (13a). Reference numeral (14) shows an auxiliary lid which is opened and closed by a spring for preventing gas leakage when the connecting pipe (4) is attached and detached.

(7) Effect of the Invention According to the present invention, when the liquid is not replenished as described above, the lid is attached to the first circular hole and the vapor passing through the ventilation pipe is passed through the second circular hole of the second cylindrical portion to the upper side. The ventilation pipe is vented to exhaust air, and when replenishing the liquid, the connecting pipe is inserted into the first circular hole and fitted into the second circular hole, and the vapor is being replenished from the second cylindrical portion. Since the material is collected through the pipe and the collecting hose, it is completely valveless and conforms to the regulations of the Fire Service Law, and has a simple structure, and is safe and inexpensive.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a refueling mode of the present invention, FIG. 2 is a longitudinal sectional view of a main portion of the first embodiment of the present invention when not refueling, and FIG. 3 is a main part of the first embodiment when refueling. FIG. 4 is an enlarged partial cross-sectional view of an essential part of the second embodiment, FIG. 5 is an enlarged sectional view of an essential part of the third embodiment, and FIG. FIG. (1) …… Underground tank (2) …… Ventilation pipe (3a) …… First cylindrical part (3b) …… Second cylindrical part (3c) …… First circular hole (3d) …… Second circular hole (4) …… Connection pipe (5) …… Lid

Claims (1)

(57) [Scope of utility model registration request] 1. A first cylinder portion having a diameter larger than that of the ventilation pipe is formed in an intermediate portion of the ventilation pipe erected from the underground tank, and a small diameter connected to the underground tank side of the ventilation pipe in the first cylinder portion. And a second cylindrical portion with a lid is provided, and a first circular hole is formed on the side surface of the first cylindrical portion and a second circular hole is formed on the side surface of the second cylindrical portion on the same line. A connecting pipe, which is inserted into the hole and fits in the second circular hole so as to come into contact with and separate from the second circular hole, is connected to the tip of the vapor recovery hose, and the first circular hole is provided with a lid for sealing the first circular hole. A vapor recovery device for underground tanks.