JPS6315200Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a liquid supply nozzle used in a liquid supply device at a gas station or the like.

Liquid supply nozzles equipped with an automatic liquid supply stop mechanism have conventionally been used. This liquid supply nozzle is equipped with a discharge pipe at the tip of the liquid supply nozzle body, and inside the liquid supply nozzle body is a liquid passage that guides the oil liquid from the oil supply hose to the discharge pipe, and a valve mechanism that opens and closes the liquid passage. and,
One end communicates with a lever for opening and closing the valve mechanism and a communication pipe, one end of which opens into a negative pressure introduction chamber defined by a movable partition wall and the other end of which opens to the outside near the tip of the discharge pipe. It is equipped with a vacuum pipe that is connected to the pipe and whose other end is open in the middle of the liquid passage, and an automatic valve closing mechanism that closes the valve mechanism by displacement of a movable partition wall due to negative pressure. During work, when the fuel tank becomes full and the opening at the other end of the communication pipe is blocked with fuel, negative pressure is generated within the communication pipe, and this negative pressure displaces the movable bulkhead, causing it to close automatically. The valve mechanism is activated, the valve mechanism is switched to the closed state, and the liquid supply operation is automatically stopped.

Therefore, this type of refueling nozzle is convenient because it has an automatic liquid supply stop mechanism when refueling ordinary automobiles, etc., but there is a
When connecting a hose as an extension pipe that reaches the bottom of a tank, etc., and performing so-called bottom charging, when the other end opening of the communication pipe is blocked with the hose, etc., the automatic valve closing mechanism starts supplying liquid. The problem arises that the liquid supply operation cannot be carried out smoothly because the liquid starts to operate immediately afterwards. On the other hand, if the opening of the communication pipe is kept open to the atmosphere by not blocking it with a hose, etc., the air sucked into the communication pipe from the opening will be sucked into the liquid passage from the communication pipe, and the air will be As a result, fuel containing a large amount of fuel is discharged, making it easy for the fuel to bubble. This phenomenon causes the problem of increased danger because it promotes vaporization of the fuel.

In view of the above problems, the present invention aims to provide a liquid supply nozzle that can easily switch from a state in which the automatic liquid supply stop mechanism is activated to a state in which the automatic liquid supply stop mechanism can be stopped without any hindrance. The present invention is characterized in that generation of negative pressure can be prevented by closing the vacuum tube with respect to one end of the communication tube by moving the discharge pipe.

An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is a liquid supply nozzle main body, and 2 is a discharge pipe attached to the tip of the main body. The main body 1 includes a liquid passage 4 whose one end is connected to the liquid supply hose 3 and whose other end opens to the outside through the inside of the discharge pipe 2.
A valve mechanism 5 for opening and closing the liquid passage 4 is provided in the middle of the liquid passage 4 in the main body 1. Reference numeral 6 denotes a lever for opening and closing the valve mechanism 5. When pulled upward about the pivot point 7, the valve mechanism 5 opens and closes.
opens, and when returned downward, the valve mechanism 5 closes. 8
is a hook for latching the lever in the operating position.

A pressure operating chamber 9 is provided within the main body 1,
This pressure working chamber 9 is divided into a negative pressure introduction chamber 9A and an atmospheric chamber 9B by a movable partition wall 10.

The movable partition wall 10 is connected to an automatic valve closing mechanism 11 that closes the valve mechanism 5 by displacement of the movable partition wall 10 due to the negative pressure in the negative pressure introduction chamber 9A. To explain the automatic valve closing mechanism 11 of this embodiment, a guide 12 is screwed into the main body 1 between the valve mechanism 5 and the discharge pipe 2, and the guide 12 has an inclined stepped portion 13A in the middle. A through hole 13 is bored.

Further, a support rod 14 is slidably fitted into the small diameter portion 13B of the through hole 13. Holes 15, 15 are formed in the upper part of the support rod 14 in the radial direction, and the support rod 14 is further urged upward in the figure by a spring 16 with the main body 1 as one seat. There is.

The movable bulkhead 10 is moved downward by the spring 17, that is, the atmospheric chamber 9B.
A needle 18 is integrally fixed to the lower surface of the movable partition wall 10.
The needle 18 has a large diameter portion 18A fitted into a large hole 14A formed in the support rod 14, and a small diameter portion 18B of the needle 18 fitted into a small hole 14B formed in the support rod 14. ing. And support rod 14
Balls 19, 19 are provided in the holes 15, 15 of the guide 12, and the balls 19, 19
A and the inclined shoulder of the needle 18 to engage the support rod 1.
The downward movement of 4 is restricted. The lever 6 is rotatably attached to the lower end of the support rod in the figure.

One end 20A of a communication pipe 20 is open to the negative pressure introducing chamber 9A of the pressure operation chamber 9, and the other end 20B of the communication pipe 20 passes through a conduit 21 in the discharge pipe 2 to the tip end 2A of the discharge pipe 2. It opens into the atmosphere from the vicinity. As shown in FIGS. 4 and 6, one end of a vacuum tube 20c, the other end of which opens in the middle of the flow path 4, is provided in the intermediate portion of the communication tube 20 in communication.

Here, the vacuum pipe 20c is the discharge pipe 2.
It is formed in the joint part 2B at the rear end of the. and,
The vacuum tube 20c has one end connected to the main body 1 and the joint part 2.
The area near the automatic valve 22, which is connected to one end 20A side and the other end 20B side of the communication pipe 20 through a gap 20D formed between It opens into the liquid passage 4 in the joint portion 2B of the discharge pipe 2.

Note that one end of the vacuum tube 20c may be configured to directly communicate with the communication tube 20 formed in the joint portion 2B, as shown in FIGS. 6 and 7.

Further, the joint portion 2B of the discharge pipe 2 is attached to the main body 1 so as to be movable in the axial direction by a dimension δ, and is biased to the left in FIG. 4 by a spring 23. The vacuum tube 20c is closed by moving the joint portion 2B of the discharge pipe 2 to the right in FIG.

An adapter hose 24 for bottom charging is detachably attached to the distal end portion 2A of the discharge pipe 2. Connect this adapter hose 24 to the discharge pipe 2
When the communication pipe 20 is attached to the other end opening 20B, the other end opening 20B of the communication pipe 20 is closed. 25 connects the adapter hose 24 to the main body 1
This is a fitting for fixing to the
Here, it also serves to maintain the joint portion 2B of the discharge pipe 2 at a position moved to the right within the main body 1. Therefore, when the main body 1 and the adapter hose 24 are connected by the fitting 25, the joint portion 2B moves to the right as shown in FIG. 5 and closes the vacuum tube 20c.

In the above embodiment, when the automatic liquid supply stop mechanism is activated, the adapter hose 24 is connected to the discharge pipe 2.
4, connect the vacuum pipe 20c to the communication pipe 20 while keeping the vacuum pipe 20c in an open state as shown in FIG. As shown in Fig. 1, pull up the lever 6 and release the hook 8.
Let it hang on. As a result, the valve mechanism 5 opens,
The oil is discharged from the oil supply hose 3, through the liquid passage 4, and from the tip of the discharge pipe 2 into the tank. At this time, due to the suction action of the oil flowing through the liquid passage 4, the air in the communication tube 20 is sucked from the vacuum tube 20c into the oil, but the end 20 of the communication tube 20
Since B is open to the atmosphere, negative pressure in the negative pressure introduction chamber 9A does not become negative. Therefore, the automatic valve closing mechanism 11 does not operate.

When the tank becomes full during refueling and the liquid level reaches the end 20B of the communication pipe 20, the end 20B is blocked, but the vacuum pipe 20c continues to suck, so the negative pressure introduction chamber 9A becomes negative. pressure and the movable bulkhead 1
0 is displaced upward in FIG. 1 and pulls the needle 18 upward. As a result, the balls 19, 19 are unlocked, the balls 19, 19 are displaced inwardly of the support shaft 14, and the engagement with the stepped portion 13A of the guide 12 is released. Therefore, the force of the spring 5A of the valve mechanism 5 and the hydraulic pressure cause the support shaft 14 to drop downward, and the valve mechanism 5 closes. At this time, the lever 6 comes off the hook 8 due to the impact and returns to its original position.

When the valve mechanism 5 closes, the suction force in the vacuum tube 20c disappears, the movable partition wall 10 returns to its original position, and the support shaft 14 is pushed upward by the spring 16 to return to the initial state shown in FIG.

Next, when supplying oil to the storage tank of a small tank lorry, for example, attach the adapter hose 24 to the tip 2A of the discharge pipe 2, and
By connecting the main body 1 and the adapter hose 24 at 5, the discharge pipe 2 is kept moved to the right as shown in FIG.
is closed to the communication pipe 20. Then, the adapter hose 24 is inserted near the bottom of the tank or into the liquid, and the lever 6 is pulled up.

At this time, the valve mechanism 5 opens and the oil flows through the liquid passage 4, but since the vacuum pipe 20c is closed to the communication pipe 20, no negative pressure is generated within the communication pipe 20. Therefore, the automatic valve closing mechanism 11
is never activated. Further, since the communication pipe 20 itself does not become under negative pressure, the generation of vibrations and noise due to negative pressure is prevented. Furthermore, the communication pipe 20
Since air is not sucked into the oil liquid from the tank, air is not mixed into the oil liquid, and bubbling of the oil liquid in the tank is prevented.

Although one embodiment has been described above, the present invention is not limited to the above embodiment, and for example, conventionally known configurations may be applied to the automatic valve closing mechanism, valve mechanism, etc.

As is clear from the above explanation, the present invention allows the vacuum pipe to be closed off to one end of the communication pipe by moving the discharge pipe, so the automatic refueling stop is simple and easy to operate. It becomes possible to switch from a state in which the mechanism works to a state in which the mechanism does not work. And since the present invention prevents the generation of negative pressure itself,
This eliminates the occurrence of undesirable negative pressure within the communication pipe, and prevents vibrations, suction noise, etc. caused by the negative pressure.

[Brief explanation of the drawing]

FIG. 1 is a partially vertical cross-sectional front view of a liquid supply nozzle showing an embodiment of the present invention. FIG. 2 is a plan view of essential parts of the liquid supply nozzle shown in FIG. 1. FIG. 3 is an enlarged vertical cross-sectional view of the main part of the liquid supply nozzle shown in FIG. 1. FIG. 4 is an enlarged vertical cross-sectional view of the main part of the liquid supply nozzle shown in FIG. 1. FIG. 5 is an enlarged vertical cross-sectional view of a main part showing the operating state of the liquid supply nozzle shown in FIG. 1. FIG. 6 is an enlarged vertical cross-sectional view of a main part of a liquid supply nozzle showing another embodiment. FIG. 7 is an enlarged vertical cross-sectional view of a main part showing an operating state of a liquid supply nozzle according to another embodiment. 1...Nozzle body, 2...Discharge pipe, 4...
Liquid passage, 5...Valve mechanism, 6...Lever, 9A...
Negative pressure introduction chamber, 10...Movable partition, 11...Automatic valve closing mechanism, 20...Communication pipe, 20c...Vacuum pipe, 24...Extension pipe (adapter hose).

Claims (1)

[Claims for Utility Model Registration] A nozzle body, a discharge pipe attached to the nozzle body, and a nozzle body having one end connected to a liquid supply hose and the other end opening to the outside through the discharge pipe. a liquid passage, a valve mechanism provided in the middle of the liquid passage, a lever for opening and closing the valve mechanism, one end opening into a negative pressure introduction chamber defined by a movable partition, and the other end opening into the discharge A communication pipe opened to the outside from the tip of the pipe, a vacuum pipe whose one end communicates with the communication pipe and whose other end opens in the middle of the liquid passage, and when the other end opening of the communication pipe is closed, the vacuum pipe In the liquid supply nozzle, the discharge pipe is movably attached to the nozzle body, and an automatic valve closing mechanism that closes the valve mechanism based on displacement of the movable partition wall due to negative pressure generated in the pipe, A biasing means is provided between the discharge pipe and the nozzle body to move and hold the discharge pipe to one side with respect to the nozzle body and communicate the vacuum pipe to one end side of the communication pipe, and the biasing means connecting an extension pipe to the tip of the discharge pipe against the pressure, and moving and displacing the discharge pipe to the other side with respect to the nozzle body so as to block communication of the vacuum pipe with one end side of the communication pipe; A liquid supply nozzle comprising the extension pipe attached to the nozzle body.