JPH0723194B2 - Liquid supply nozzle with safety device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid supply nozzle with a safety device that prevents discharge of liquid caused by the liquid supply nozzle falling out.

(Prior Art) When the cylinder tip portion of the liquid supply nozzle is not completely inserted into the liquid injection port, sometimes an accident occurs in which the liquid supply nozzle falls out and liquid is discharged from the cylinder tip.

In order to prevent this kind of discharge accident, the device disclosed in Japanese Utility Model Publication No. 47-5753 has a ball valve installed in an air passage pipe that connects a cylinder tip portion, a negative pressure generating portion of a pipe passage, and an automatic valve closing mechanism. When the liquid supply nozzle falls out with the tip of the cylinder facing up, the ball valve closes the air passage pipe, and the negative pressure generated in the negative pressure generating section is applied to the automatic valve closing mechanism to automatically operate the main valve. Although it is designed to be closed, the safety device configured in this way
Even if it is effective for a liquid supply nozzle having a general automatic valve closing mechanism, it is effective for a liquid supply nozzle of an automatic additional liquid supply type as disclosed in JP-A-63-125196. has no effect.

In other words, the automatic additional liquid supply type liquid supply nozzle closes the flow path once the opening on the cylinder tip side of the air flow path tube is closed by the liquid, and then restarts the flow path when liquid supply is started after a certain period of time. Although it is opened so that additional liquid can be supplied,
In the case of this type of liquid supply nozzle, even if the air flow path pipe is closed by the ball valve to close the main valve at the time of dropping, the main valve opens the flow path again due to the subsequent liquid supply start. Therefore, there is a problem that it is impossible to suppress the discharge of the liquid due to the drop of the liquid supply nozzle.

(Object) The present invention has been made in view of such a problem, and an object of the present invention is to reliably prevent discharge of liquid due to dropping even to a liquid supply nozzle of an automatic additional liquid supply type. It is to provide a new liquid supply nozzle with a safety device capable of performing.

(Means for Achieving the Purpose) That is, the present invention provides a liquid supply nozzle with a safety device for achieving the above object, and a mechanism for closing the main valve by operating by closing the opening end of the air passage pipe by the liquid. A liquid supply nozzle equipped with a mechanism for opening the main valve by the liquid supply of the liquid supply means that operates after a lapse of a certain period of time, and a closing means for closing the air passage pipe by the upward posture of the cylinder tip portion, Lever locking means with a weight that is operated to release the locking of the valve opening lever by the impact applied to the liquid supply nozzle is provided.

(Operation) With the above configuration, if the liquid supply nozzle should come off the liquid injection port, the closing means closes the air flow path pipe in the process of dropping, and the automatic valve closing mechanism works to discharge the liquid. After the drop, the valve opening lever is unlocked by the lever locking means by the impact applied to the liquid supply nozzle, and the additional liquid supply operation after that is disabled, and the liquid discharge from the liquid supply nozzle is suppressed. .

(Example) Then, the Example illustrated below is described.

FIGS. 1 and 2 show an embodiment of the present invention. An air passage pipe 3 having an opening 3a at one end thereof is inserted into the liquid supply nozzle 1 near the tip of the barrel tip portion 2 and the other end thereof is inserted. Is a negative pressure generating portion 10 of a check valve 9 provided on the barrel portion 8 and an automatic valve closing mechanism 20.
It communicates with the inside of the negative pressure chamber 21. A bag-shaped valve receiver 5 having a through hole 4 on one side of the bottom surface is attached to the air passage pipe 3 from the check valve 9 to the cylinder tip portion 2, and the cylinder tip portion 2 is provided inside thereof. A ball valve 6 that closes the open end of the air flow pipe 3 on the check valve 9 side when it is facing upward is movably accommodated.

On the other hand, an end portion of a hose 12 that communicates with a liquid supply pump (not shown) is coupled to the side surface of the barrel portion 8, and from this, the barrel tip portion 2
A main valve 15 which is always biased by a spring 16 via a valve rod 13 so as to close the flow passage is disposed in the flow passage reaching to the second side. As shown in the figure, there is provided an automatic valve closing mechanism 20 for closing the main valve 15 by deforming the diaphragm 22 by the negative pressure generated in the negative pressure chamber 21. As is well known, the automatic valve closing mechanism 20 operates so as to close the main valve 15 when the end of the opening 3a located at the tip of the tube tip portion 2 of the air flow pipe 3 is blocked by the liquid in the tank. , The negative pressure chamber 21 communicating with the air flow pipe 3 always has a spring 23.
The diaphragm 22 is urged outward by the tension member 22.The diaphragm 22 is fixed with a U-shaped piece 24 as shown in Japanese Patent Publication No. 51-27885.
Two pins 25, which slide in the elongated holes of 24, are positioned in a notch 14 provided in a part of the valve rod 13, and these are inserted into a recess 27 of a push rod 26 inserted in the valve rod 13. By engaging and disengaging, the valve rod 13 and the push rod 26 are configured to come into contact with and separate from each other. The above-mentioned push rod 26 is in contact with the rear surface of the push rod 26 so as to always urge the lever 30 forward by a spring 28 acting on its rear end, and pulls the lever 30 pivotally supported by a pin 31 at one end. By this, the push rod 26 is moved to the right in the figure against the spring 28, and the flow path is opened together with the valve rod 13 and the main valve 15 which are connected to the push rod 26 via the pin 25. .

Further, a valve seat 17, which is in contact with the main valve 15 and closes the flow path, is slidably arranged on the upstream side of the check valve 9 in the above-described barrel body 8. In addition to the general valve seat function, the valve seat 17 removes the main valve 15 that is disengaged from the push rod 26 by the liquid level detection and is in contact with the main seat 15 from the hydraulic pressure generated when the liquid supply is stopped thereafter. It has the function of pushing it to the right in the figure when it is opened, and connecting it again with the push rod 26 via the pin 25. The compression spring 18 for moving to the right in the figure acts.

By the way, in the liquid supply nozzle 1 configured as described above, the lever guard 32 for protecting the lever 30 is provided below the barrel portion 8.
Is provided, and a lever locking member 33 having a weight 34 at its free end is pivotably supported about a pin 35 as a fulcrum, and the liquid supply nozzle 1 falls off the liquid injection port and falls. At that time, due to the impact, the lever locking member 33 rotates in the clockwise direction in the figure with the pin 35 as a fulcrum, and the notch 36 releases the locking of the lever 30 held at the valve open position to return it to the valve closed position. It is configured.

Next, the liquid supply operation by the liquid supply nozzle and the liquid supply stop operation at the time of dropping will be described with reference to FIG.

As shown in FIG. 3 (i), under the condition that the liquid supply nozzle 1 is hung on the nozzle hook (not shown), that is, under the condition that the liquid supply pump is stopped and the lever 30 is not operated. , A valve seat 17 slidably assembled in the barrel portion 8
Has moved to the right in the figure to a position where it comes into contact with the stopper 19 due to the urging force of the spring 18 acting on its back surface.
Therefore, the main valve 15 that is biased by the spring 16 and is in contact with the valve seat 17 is also pushed back to the right in the figure, and the pin 25 located in the notch 14 of the valve rod 13 is The valve rod 13 and the push rod 26 are engaged with each other by engaging the recess 27.

Under this condition, if the liquid supply nozzle 1 is removed from the nozzle hook to fill the fuel tank of an automobile with gasoline, for example,
The signal from the nozzle switch causes the pump motor to drive the liquid supply pump to start the liquid supply operation. Because of this, the spring
The valve seat 17, which was urged by 18 and located on the right side in the figure, retracts to the left side in the figure with the main valve 15 in contact with the fluid pressure from the liquid supply pump (see FIG. 3). (Ii)). Therefore, under this condition, the cylinder tip 2 is next inserted into the liquid supply port of the tank,
When the lever 30 is pulled and locked in the notch 36 of the lever locking member 33, the push rod 26 pushed by the lever 30 pulls the valve rod 13 integrally connected via the pin 25 back to the right in the figure. The main valve 15 is opened (Fig. 3 (iii)), the liquid sent from the liquid supply pump is guided from the negative pressure generating portion 10 of the check valve 9 to the cylinder tip portion 2 and is then supplied into the tank. To do. When the liquid supply is started in this way, a negative pressure is generated in the negative pressure generating portion 10 of the check valve 9 by the Venturi effect, and the inside of the air flow path pipe 3 opened here is made negative, but The end of the opening 3a on the cylinder tip 2 side of the flow path pipe 3 is in the atmosphere and sucks air, and this air flows into the negative pressure generating portion 10 from the through hole 4 provided on one side of the bottom surface of the valve receiving body 5. Therefore, the inside of the pipe 3 is at normal pressure at this point.

When the liquid level in the tank rises due to the subsequent supply of liquid, and the end of the opening 3a of the cylinder tip 2 is eventually closed by the bubbles on the liquid surface, the inside of the negative pressure chamber 21 communicating with the air flow pipe 3 is formed. Is a negative pressure due to the negative pressure action in the negative pressure generating section 10, and this negative pressure attracts the diaphragm 22 against the spring 23 in the direction of the figure, and pulls up the piece 24 integrated with this to pull up the pin 24. 25 is removed from the recess 27 of the push rod 26. As a result, the valve rod 13 released from the restraint by the pin 25 moves to the left in the figure by the urging force of the spring 16 acting on the valve rod 13 together with the pin 25, and brings the main valve 15 into contact with the valve seat 17. To close the pipe and stop the liquid supply (Fig. 3 (iV)).

Then, in this state, the liquid supply stop detection means connected to a flow meter (not shown) detects the liquid supply stop and stops the pump motor by the signal. Prior to this, the valve seat 17 whose hydraulic pressure was released moved to the right in the figure while pushing the main valve 15 by the urging force of the spring 18, and at the end of the valve seat 17, the pin seated again.
The valve rod 13 and the push rod 26 are connected via 25 (FIG. 3 (v)).

Then, when a preset time, that is, a time of 2 to 3 seconds until the bubbles disappear, elapses from this state, the motor control circuit restarts the pump motor 43. As a result, the liquid that has flowed into the barrel portion 8 moves the valve seat 17 to the left in the figure against the spring 18, separating the main valve 15 and the valve seat 17 and entering the additional liquid supply operation. (Fig. 3 (iii)).

Then, the additional liquid supply again closes the open end of the air flow pipe 3 on the cylinder tip 2 side, and when the automatic valve closing mechanism 20 operating together closes the main valve 15 to stop the liquid supply,
After that, the above operation was repeated to intermittently supply additional liquid, and when this was repeated several times, the motor control circuit considered that the tank was full, stopped the pump motor, and supplied all liquid. End the operation.

By the way, during the liquid supply shown in FIG. 3 (iii), if the liquid supply nozzle 1 comes off from the liquid injection port of the tank for some reason, the liquid supply nozzle 1 is placed with the barrel tip 2 facing upward. To fall. When such a situation occurs, the ball valve 6 provided in the air passage pipe 3 moves to the check valve 9 side of the air passage pipe 3 by its own weight as shown in FIG. Stop. Therefore, the inside of the air flow pipe 3 is as if the cylinder tip 2
As in the case where the end of the side opening 3a is closed by liquid, a negative pressure is generated, and the inside of the negative pressure chamber 21 communicating with this is immediately made negative, and the diaphragm 22 is sucked upward and the pin 25 is pushed. Remove it from the recess 27 of the rod 26 and attach the valve rod 13 to the spring 11.
The main valve 15 is brought into contact with the valve seat 17 by the urging force of (1) to bring the main valve 15 into contact with the valve seat 17, and the liquid supply is stopped in the state shown in FIG. 3 (iv).

Then, when the liquid supply nozzle 1 comes into contact with the ground due to the subsequent drop, a strong impact is applied to the liquid supply nozzle 1, and accordingly, the lever locking member 33 is moved by the action of the weight 34 fixed to the free end side. 3. From the state shown in Fig. 3 (iv), rotate the lever clockwise to unlock the lever 30. Therefore, the push rod 26 pushes the lever 30 forward by the urging force of the spring 28 acting on the push rod 26 to return it to the state before the operation, and at the same time, the push rod 26 engages the pin 25 with the recess 27 and the valve rod 13
In order to prevent the liquid from being discharged even if the pump motor is restarted after the liquid supply is stopped by returning to the initial state of FIG. 3 (i).

(Effect) As described above, according to the present invention, the liquid supply nozzle that detects the liquid surface, stops the liquid supply, and restarts the liquid supply by the liquid supply after a lapse of a certain time is supplied to the liquid supply nozzle. Since the closing means for closing the air passage pipe by operating the liquid nozzle in the upward posture and the lever locking means with a weight for operating to release the valve opening lever by the impact applied to the liquid supply nozzle are provided. In the process of the nozzle falling out of the liquid injection port and dropping, the automatic closing mechanism works by the closing of the air flow pipe by the above-mentioned closing means to prevent liquid discharge, and after dropping and closing the main valve, it is temporarily sent. Even if the liquid means is restarted, the operation of releasing the main valve is no longer performed, and this prevents the accidental discharge of the liquid that is likely to occur in the main repetitive full tank refueling type liquid supply nozzle, and causes various adverse effects. Can be eliminated.

[Brief description of drawings]

1 and 2 are a side view and a top view showing a liquid supply nozzle according to an embodiment of the present invention in cross section, and FIGS. 3 (i) to (v) are explanatory views showing their respective operations, and FIG. The drawing is an explanatory view showing the operation of the liquid supply nozzle in the dropping process. 1 ... Liquid supply nozzle, 3 ... Air flow pipe 6 ... Ball valve, 13 ... Valve rod 15 ... Main valve, 17 ... Valve seat 20 ... Automatic valve closing mechanism, 30 ... Lever 33 ... … Lever locking member, 34… Weight

Claims (1)

[Claims] 1. A mechanism for closing a main valve by closing an open end of an air flow pipe by a liquid, and a mechanism for closing a main valve by a liquid sending means which operates after a lapse of a certain time thereafter to open a main valve. And a closing means for closing the air flow pipe by the upward posture of the liquid supply nozzle, the lever being engaged with the tip of a lever for opening the main valve. A lever locking member that locks the lever is pivotally supported by a pin planted in a lever guard as a fulcrum, and a weight is attached to a free end portion of the lever locking member. Liquid supply nozzle.