JPH0315519Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a negative pressure outlet hole arrangement structure of a refueling nozzle with an auto stopper.

(B) Conventional technology Conventionally, in a refueling nozzle with an auto-stop configured to lock the refueling valve in an open state to continue refueling, an ejector part is provided in the internal flow path of the refueling nozzle, and the refueling valve is locked in the open state to continue refueling. Negative pressure is generated by the fuel oil flowing through the ejector, and this negative pressure is broken by air flowing in from a communication hole provided near the tip of the nozzle. When fuel oil reaches the hole, it flows in through the hole. The system is configured so that the increase in negative pressure when the fluid to be supplied is switched from air to fuel oil having a large inertial mass and viscosity is guided to an unlocking mechanism to operate the mechanism, thereby releasing the lock and closing the fuel supply valve. The negative pressure outlet hole b for discharging negative pressure from the ejector part of this nozzle is located in the ring-shaped ejector part a, as shown in FIG. A large number of them were arranged at approximately equal intervals all around the circumference.

(c) Problems to be solved by the invention However, in recent years, as shown in Figure 3, piping e for refueling has been installed on the roof d covering the upper part of the refueling location c.
A space-free refueling station has emerged in which a refueling hose f is installed vertically, and a refueling nozzle g is connected to the end of the hose. is heated by direct sunlight, and part of the fuel oil vaporizes, making it impossible to release negative pressure from the ejector.
For this reason, there was a drawback that the auto-stop mechanism did not operate because the lock for stopping the refueling was not released.

Note that if the auto-stop mechanism does not operate and fuel oil overflows, flammable fuel oil has leaked out, creating an extremely dangerous situation.

(d) Means for solving the problem In this invention, an ejector part is provided in the internal flow path of the fuel nozzle for refueling the tank of a vehicle, etc., and the negative energy generated in the ejector part during refueling is eliminated. The pressure is broken only by the air flowing in from the communication hole provided near the tip of the nozzle, and when the fuel oil supplied to the tank reaches the communication hole, the fluid flowing in from the hole changes from the air to the fuel. A refueling system with an auto stopper configured to automatically stop refueling by unlocking the refueling valve of the same nozzle, which is locked in the open state, by the rise in negative pressure that occurs when switching to oil, and closing the valve. In the nozzle, the negative pressure outlet hole from the ejector part is arranged only in the lower half of the ejector part, and the negative pressure outlet hole has the same inner opening diameter on the inner peripheral surface of the ventilate provided in the ejector part. It is an object of the present invention to provide a negative pressure outlet hole arrangement structure for a refueling nozzle with an auto stopper, which has an outer opening opening in the outer peripheral surface formed in a large tapered shape.

(e) Effect This design focuses on the fact that vapor is unevenly distributed in the upper part of the nozzle internal flow path, and provides a negative pressure outlet hole only in the lower half of the ejector part, and a negative pressure outlet hole in the upper half of the ejector part. Since the structure is such that no pressure outlet holes are provided, negative pressure can be extracted without any problems caused by vapor contamination, and the auto-stop mechanism can be operated reliably. Note that the negative pressure in the ejector section is generated by the flow rate of fuel oil, and the negative pressure generated in the part of the ejector section through which fuel flows, that is, the lower half, is led out through the negative pressure outlet hole. Since the outlet hole is not in communication with the upper half where vapor flows and where negative pressure is weakly generated, there is no problem caused by vapor contamination.

In particular, by forming the negative pressure outlet hole formed in the ventilate of the ejector part in a tapered shape, the outer opening opening on the outer circumferential surface is larger than the inner opening opening diameter on the inner circumferential surface of the ventillary.
The resistance of air flowing from the outside to the inside through the negative pressure outlet hole is reduced, and a large amount of air can be sucked in. Sufficient negative pressure can be transmitted to each part, and the fuel oil flows through the communication hole. The rise in negative pressure when reaching 100 kW is greater than that in a case where the negative pressure outlet hole is not tapered, and the lock can be reliably released.

(f) Effects According to this invention, the negative pressure outlet hole is provided only in the lower half of the ejector, which prevents the auto-stop mechanism from being damaged by vapor, ensures the operation of the mechanism, and prevents fuel oil overflow. This has the effect of preventing this and improving safety.

(G) Embodiment The embodiment of this invention will be explained in detail based on the drawings. A shows a refueling nozzle with an automatic stopper, and a refueling pipe installed on the roof d covering the refueling location c. It is connected to the tip of a refueling hose f hanging vertically from e through a rotatable swivel joint 1.

The refueling nozzle A is composed of a nozzle body 4 containing a refueling valve 2 and a locking mechanism 3, and a nozzle tip 5 connected to the end of the nozzle body 4. Nozzle tip 5
The system is configured to refuel the fuel tank of a vehicle, etc. from the fuel tank.

The nozzle body 4 has a flow passage 6 formed therein, and a refueling valve 2 disposed in the middle of the flow passage 6. The valve 2 has a valve stem connected below a valve body 7 of a machine room type. The valve body 7 is separated from and brought into contact with the valve seat 9 by the vertical movement of the valve stem 8, thereby communicating and blocking the flow path 6. -1 are disposed adjacent to each other, and when the lever 10 is operated, the valve stem 8 is brought into contact with the valve stem 8 and the stem 8 is moved upward.
A closing spring 7-1 is interposed between the inner surface of a cap 11 screwed onto the upper part of the nozzle body 4, and the valve element 7 is pressed against the valve seat 9.

In addition, the nozzle body 4 is provided with a cylindrical case 12 of the locking mechanism 3 in a state that crosses the flow path 6 and does not communicate with the flow path 6. A refueling valve 2 unlocking mechanism 3 is housed inside.

The unlocking mechanism 3 includes a rod 1 connected to the base end 10-2 of the valve lever 10 in the case cylindrical body 12.
3 is inserted vertically and slidably, and the rod 13 is urged upward by a return spring 14.

The lock cone insertion hole 13 is located at the upper end of the rod 13.
-1, and three ball fitting holes 13-2 are formed at equal intervals on the outer peripheral surface of the upper end, and a lock ball 13-3 is fitted into each of the holes 13-2. The outer side corresponds to the inner circumferential surface of the enlarged inner diameter part 12-1 formed in the upper part of the case cylindrical body 12, and the inner side corresponds to the conical outer circumferential surface of the lock cone 15 inserted from above into the lock cone insertion hole 13-1. are in contact with each other.

The upper end of the lock cone 15 is connected to the center of a diaphragm 16, and the upper surface of the diaphragm 16 faces the inner surface of a vacuum chamber 17 connected to the upper part of the nozzle body 4. A spring 18 is interposed between the upper surface of the diaphragm 16 and biases the diaphragm 16 downward.

The inside of the vacuum chamber 17 communicates with the inner circumferential surface of the connecting portion 4-1 at the tip of the nozzle body 4 via a communication passage 19 bored inside the nozzle body 4. An ejector portion 20 is connected to the base end 5-1 of the inserted nozzle tip 5.

The ejector section 20 is composed of a ventilator 21 and a leak prevention valve body 22 that is biased 23 in the direction of the ventilee 21. Negative pressure is generated on the circumferential surface 21-1, and this negative pressure is transferred to the outer circumferential surface of the ventilate 21 and the inner circumferential surface of the connecting portion 4-1 through the negative pressure outlet hole 24 bored in the inner circumferential surface 21-1. Negative pressure is led out to the vacuum chamber 17 by leading out between the vacuum chamber 17 and the vacuum chamber 17.

In particular, in the present invention, the negative pressure outlet hole 24 is provided only in the lower half of the ejector part 20, that is, the lower half of the inner peripheral surface of the ventilate 21, and the negative pressure outlet hole is provided in the upper half of the same. As a result, the upper half is insulated from the negative pressure lead-out path.

In addition, the details of the negative pressure outlet hole 24 are shown in FIG.
-1, the outer opening diameter 21-4 opened on the outer circumferential surface 21-3 is larger than the inner opening diameter 21-2 in the ventilary 21. By arranging them in a concentrated manner in the lower half of the cylinder, a sufficient opening area is secured for deriving negative pressure.

Therefore, the resistance of the air flowing from the outside to the inside through the negative pressure outlet hole is reduced, and a large amount of air can be sucked in, so that sufficient negative pressure can be transmitted to each part, and the fuel oil When the negative pressure reaches the communication hole, the rise in negative pressure is greater than that in a case where the negative pressure outlet hole is not tapered, and the lock can be reliably released.

A communication tube 26 that communicates with the inner peripheral surface of the connecting portion 4-1 is inserted into the inside of the nozzle tip 5.
The tip of the nozzle 6 communicates with a communication hole 27 bored near the tip of the nozzle tip 5.

To perform refueling with the refueling nozzle A configured as described above, insert the nozzle tip 5 into the fuel tank and operate the valve lever 10 upwards. First, the closing spring 7-1 of the refueling valve 2 acts as a fulcrum, and the rod 13 of the unlocking mechanism 3
The lock ball 13-3 at the upper end of the lock 13 is moved downwardly against the urging force of the return spring 14, and the lock ball 13-3 at the upper end of the lock 13 is moved against the stepped portion 12 at the lower end of the enlarged inner diameter section 12-1 of the case cylinder 12.
-2 and the stopper bolt 15-1 hanging from the lower end of the lock cone 15, preventing the rod 13 from moving any further downward, and this time, the valve lever tip 10 connected to the rod 13 is pinched. -2
The middle part 10 of the lever 10 rotates around .
-1, the biasing force of the closing spring 7-1 is overcome and the refueling valve 2 is opened to start refueling.

Further, a lock lever 28 is rotatably supported at the base end of the nozzle body 4 around a pin 28-1, and a leaf spring 28-2 attached to the lever 28 is supported.
The force of the valve lever tip 10-3 is counteracted by the frictional force between the mountain-like protrusion 10-4 formed on the valve lever tip 10-3 and the lock groove 28-3 formed in the lock lever 28. 3 is locked so that the oil supply valve 2 can be locked in the open state.

In the above-mentioned locked state, refueling continues, and negative pressure is generated in the ejector part 20 due to the flow rate of fuel oil flowing through the ejector part 20. However, since air is sucked in through the communication hole 27, the negative pressure is reduced. It has been broken.

As this refueling state continues, the oil level in the fuel tank gradually rises, and when the oil level reaches the communication hole 27,
Fuel oil will be inhaled instead of air,
Since fuel oil has greater flow resistance and inertial mass than air, the previously broken negative pressure is guided to the vacuum chamber 17, which sucks the diaphragm 16 upward and locks the lock cone 1.
The lock ball 13-3 is released from the pinched state by pulling up the stopper bolt 15-1 of No. 5, and the oil supply valve 2 is closed by the bias of the closing spring 7-1, and the rod 13 is moved downward to open the valve lever. The position of the valve lever 10 is changed so that the tip is upwardly moved, the frictional force between the mountain-like protrusion 10-4 and the lock groove 28-3 is reduced, and the lock of the valve lever tip 10-3 is released by the biasing force of the leaf spring 28-2. The lever 10 is then returned to the initial position before the refueling operation.

The refueling nozzle of this embodiment operates as described above, and in particular, by providing the negative pressure outlet hole 24 only in the lower half of the ejector part 20 and insulating the upper half from the negative pressure outlet system. , summer, etc., roof d
Even if the pipe e installed in the ejector 20 is heated and paper is generated in the fuel oil, the paper is unevenly distributed in the upper part of the flow path. If the pressure is derived and the upper half is insulated from the negative pressure derivation system, there will be no problem in deriving the negative pressure and the auto-stop operation will be performed reliably.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view (Fig. 2 - cross section) showing the negative pressure outlet arrangement structure according to the present invention;
FIG. 3 is a vertical cross-sectional view of a refueling nozzle equipped with the structure of the present invention, and FIG.
The figure is an enlarged cross-sectional view showing the details of the negative pressure outlet hole.
The figure is a cross-sectional view showing a conventional negative pressure outlet arrangement structure. A; Refueling nozzle; 2; Refueling valve; 20; Ejector portion; 24; Negative pressure outlet hole; 27; Communication hole.

Claims (1)

[Scope of utility model registration request] An ejector part 20 is provided in the internal flow path of a refueling nozzle A for supplying fuel oil into a tank of a vehicle, etc., and the negative pressure generated in the ejector part 20 during refueling is communicated near the tip of the nozzle A. Hole 27
Break only with the air flowing in from the
When the fuel oil supplied to the tank reaches the communication hole 27, the refueling valve of the nozzle A is locked in the open state due to the negative pressure rise that occurs when the fluid flowing in from the hole 27 switches from air to fuel oil. In the refueling nozzle A with an auto stopper, which is configured to release the lock of 2 and close the valve 2 to automatically stop refueling, the negative pressure outlet hole 24 from the ejector section 20 is connected to the The negative pressure outlet hole 24 is provided only in the lower half part, and the negative pressure outlet hole 24 is provided on the inner circumferential surface 21 of the ventilate 21 provided in the ejector part 20.
Negative pressure outlet hole arrangement structure of a refueling nozzle with an auto stopper in which an outer opening diameter 21-4 opened on the outer circumferential surface 21-3 is tapered to be larger than the inner opening diameter 21-2 in -1.