JP3358636B2 - Automatic refueling nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic refueling nozzle suitable for a refueling device for supplying fuel oil by a refueling pump common to a plurality of measuring mechanisms.

[0002]

2. Description of the Related Art An automatic refueling nozzle used in a gas station or the like engages with a lever via a locking member so as to be disengageable, as shown in Japanese Patent Publication No. 3-64398.
A main valve that comes into contact with the valve seat by the urging force of the first spring and moves in a direction of retracting from the valve seat by raising the lever, and a locking member that detects the liquid level in the tank and connects the main valve and the lever to the locking member. An automatic valve closing mechanism for disengaging and bringing the main valve into contact with the valve seat; displacing in the direction of receiving the liquid pressure and disengaging from the main valve; A valve seat that is depressed and displaced in the direction of the main valve by the force to re-engage the main valve with the lever, and feeds the fuel oil from the pump, and stops the liquid feed to move the valve seat and the main valve. It is configured to control a refueling operation and a refueling stop operation. However, in the oil supply device that receives the supply of the fuel oil by the common pump, the supply of the fuel oil must be continued to the other nozzles. The liquid pressure in the main valve chamber cannot be released via the pump as in the case of stopping the liquid supply by stopping the pump. It is extremely difficult to retract the valve seat and the main valve by the force of the spring generated. In order to solve such a problem, a bypass pipe is provided between the main valve chamber and the nozzle via an electromagnetic valve,
It is conceivable to open and close this solenoid valve in accordance with an automatic valve closing operation by a drive signal. However, there is a problem that not only the size of the nozzle becomes large but also the control device becomes complicated.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and an object of the present invention is to operate a main valve and a valve seat at the time of automatic closing only by operating a refueling lever. It is an object of the present invention to provide a new automatic refueling nozzle capable of releasing a hydraulic pressure to be supplied.

[0004]

SUMMARY OF THE INVENTION In order to solve such a problem, according to the present invention, a lever is removably engaged via a locking member, and a valve seat is actuated by the urging force of a first spring. A main valve that moves in a direction of retreating from the valve seat by raising the lever, and detects a liquid level in the tank to disengage the locking member from the main valve and the lever. An automatic valve closing mechanism for bringing the main valve into contact with the valve seat, displacing in a direction of being separated from the main valve in response to a liquid supply pressure, and releasing the liquid supply pressure and applying a biasing force of a second spring; A valve seat for pressing and displacing in the direction of the main valve to re-engage the main valve with the lever; forming a passage in the main valve to communicate with a cylinder tip, and raising the passage by raising the lever To open the passage and always open the passage.
A small valve biased by the automatic closing mechanism.
At the time of valve operation, the hydraulic pressure in the area between the valve seat and the main valve is shifted toward the cylinder tip.
It is configured to escape .

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows an embodiment of a fuel supply system to which a fuel supply nozzle according to the present invention is applied. In the drawings, reference numerals 1 and 2 denote fueling devices, respectively, which are connected to a submergable pump 5 via a fuel oil supply pipe 6. It is configured to measure the fuel oil in the underground tank 7 that is being pumped. These refueling devices 1 and 2 include flow meters 12 and 13 connected to a fuel oil supply pipe 6 via solenoid valves 10 and 11, respectively.
The apparatus includes automatic refueling nozzles 16 and 17 described below connected via nozzle hoses 14 and 15, control means 18 and 19, and indicators 20 and 21 for displaying refueling data.
The control means 18 and 19 open and close the solenoid valves 10 and 11 according to signals from the nozzle switches 22 and 23, and also control the flow rate pulse transmitters 24 and
The signals from the display units 20 and 2 are counted and the refueling amount is counted.
1 is output.

FIGS. 2 and 3 show one embodiment of the above-described automatic refueling nozzle of the present invention. The refueling nozzle body 31 includes a cylinder tip 32, a cylinder body 33 and a grip 3
An air passage pipe 35 having one end communicating with an opening 35 a provided near the tip of the tube tip 32 is inserted into the tube tip 32, and the other end is provided with a flow path 6.
The valve 2 is connected to the negative pressure generating chamber 37 of the check valve 36 provided in the cylinder body 33 through the passage 2, and further opens into the negative pressure chamber 51 of the automatic valve closing mechanism 50 through the flow path 63.

On the other hand, a main valve chamber 39 is provided in the cylinder body 33, and the flow meters 12, 1
The flow path connected to the other ends of the hoses 14 and 15 communicating with the pipe 3 and reaching the cylinder tip portion 32 from the main valve chamber 39 is urged by a spring 41 via a valve rod 43 so as to always close the flow path. A main valve 42 is provided.
As shown in FIG. 3, an automatic valve closing mechanism 50 for deforming the diaphragm 52 by the negative pressure generated in the negative pressure chamber 51 and closing the main valve 42 is provided on the side surface of the main valve 42.

As is well known, the automatic valve closing mechanism 50 opens the main valve 42 when the opening 35a located at the tip of the cylinder tip 32 of the air passage pipe 35 is closed by the liquid in the vehicle fuel tank. The diaphragm, which operates so as to close the flow path, is always urged outward (downward in the figure) by a spring 53 to a negative pressure chamber 51 which communicates with the air flow path pipe 35 via the flow path 63. In the diaphragm 52, a U-shaped piece 54 is fixedly provided, and two pins 55 that slide in the long groove of the piece 54 are provided in a part of the valve rod 43. By being located in the notch 34 and being configured to be engaged with and disengaged from the concave portion 57 of the push rod 56 inserted into the valve rod 43, the valve rod 43 and the push rod 56 are configured to be brought into and out of contact with each other. ing.

The push rod 56 is always in contact with the back surface of the push rod 56 so as to urge the oil supply lever 61 forward by a spring 58 acting on its rear end, and one end is rotatably supported by a pin 64. Pulling the refueling lever 61 moves the push rod 56 rightward in the figure against the spring 58, and opens the flow path with the valve rod 43 and the main valve 42 engaged with the push rod 56 via the pin 55. It is configured as follows.

A valve seat 38, which is in contact with the main valve 42 and closes the flow path, is slidably disposed on the cylinder body 33 upstream of the check valve 36. The valve seat 38 has a general function and a main valve 42 which is detached from the push rod 56 by liquid level detection and abuts on the push rod 56. The valve 73 has the function of moving the main valve 42 rightward in the drawing due to the decrease in the hydraulic pressure due to the opening of the through-hole 75 by the opening 73 and engaging it with the push rod 56 again via the pin 55. Is the spring 4
The urging force of the spring 46 is strong enough to move the main valve 42 rightward in FIG.

Reference numeral 73 in the figure denotes the aforementioned small valve provided on the main valve 42, and an operating rod 70 whose one end is always in contact with the refueling lever 61 by a coil spring 71 as shown in FIG.
And is movably accommodated in the small valve chamber 74. The small valve chamber 74 communicates with the through-hole 75 at the tip end side of the main valve 42 with the nozzle cylinder tip 32, and communicates with the main valve chamber 74 via the small hole 76. The through hole 75 is provided at a position facing the small valve 73, and is opened by pulling up the lever 61 (FIG. 4B). Reference numeral 78 in the drawing indicates a packing member provided on the main valve 42.

FIG. 5 shows an embodiment of the control means 18 and 19 in the above-described refueling devices 1 and 2. Numerals 81 and 91 in the figure denote counting means, and the flow pulse transmitter 2
The flow rate pulses from 4 and 25 are counted and converted into the amount of refueling.
Is displayed as the refueling amount. 83, 93
The refueling stop detecting means determines that the refueling operation has stopped when the flow rate pulses input from the flow rate pulse transmitters 24 and 25 decrease sharply, and outputs a signal. 84,
Reference numeral 94 denotes a time measuring means which is activated by a signal from the refueling stop detecting means 83, 93 and outputs a signal when a time until bubbles in the automobile fuel tank disappears, for example, two to three seconds has elapsed. is there. Numerals 85 and 95 denote solenoid valve driving means, which are nozzle off signals from the nozzle switches 22 and 23,
And the signals from the timing means 84 and 94, the solenoid valve 10,
11 is opened, and the electromagnetic valves 10 and 11 are closed by signals from the refueling stop detecting means 83 and 93. 87 is a pump control means, which is one of the oil supply devices 1 and 2
The pump 5 detects that a nozzle off signal has been output from the
, And the nozzles of all the fueling devices 1 and 2 stop the pump 5 upon detecting that the disconnection signal has been lost.

In this embodiment, the refueling nozzles 16, 1
When the nozzle 7 is set to the nozzle hook of the oil supply devices 1 and 2, the submerged pump 5 is stopped, and the solenoid valves 10 and 11 are also closed. In this state, as shown in FIG. 6 (i), the valve seat 38 slidably assembled in the main valve chamber is brought to a position where it comes into contact with the stopper 65 by the urging force of the strong spring 46 acting on the rear surface thereof. It is moving rightward in the figure. Therefore, the main valve 42 urged by the spring 41 and in contact with the valve seat 38 is also pushed back to the right in the drawing, and during this time, the pin 55 located in the notch 34 of the valve rod 43 is And the push rod 56 is engaged with the valve rod 43. Further, the small valve 73 is connected to the lever 61 in the state shown in FIG.
To close the through hole 75 of the main valve 42.

In this state, when one fuel supply nozzle 16 is removed from the nozzle hook to fill the fuel tank of the vehicle with gasoline, the control means 1 receives a signal from the nozzle switch 22.
8 returns the display of the display 20 to zero, activates the mergeable pump 5, and opens the solenoid valve 10. For this reason, the valve seat 38 occupying the forward position (right side in the figure) biased by the spring 46 retreats (leftward in the figure) while receiving the hydraulic pressure from the pump 5 and keeping the main valve 42 in contact. (Fig. 6 (ii)). Even in this state, since the other end of the operating rod 70 of the small valve 73 is in contact with the lever 61, the small valve 73 closes the through hole 75 of the main valve 42 and prevents the fuel oil from flowing out from the through hole 75.

Next, when the cylinder tip portion 32 is inserted into the filler port of the vehicle fuel tank and the fuel supply lever 61 is pulled and locked at the latch 88 at that position, the push rod 56 pushed by the lever 61 is moved through the pin 55. Combined and integrated valve rod 4
3 is pulled back to the right in the figure to open the main valve 42 (FIG. 6 ii).
i), the fuel oil sent by the pump 5 and passed through the electromagnetic valve 10 is guided from the negative pressure generating portion 37 of the check valve 36 to the cylinder tip portion 32, and then supplied into the tank. When the refueling is started in this way, a negative pressure is generated in the negative pressure generating portion 37 of the check valve 36 due to the Venturi effect. , The inside of the air passage pipe 35 is maintained at the atmospheric pressure at this time. In this state, since the lever 61 is pulled, the operating rod 70 is retracted, and the small valve 73 opens the through hole 75 (FIG. 4B).

When the level of the liquid in the tank rises due to the subsequent refueling, and the opening 35a located in the cylinder tip 32 is closed by the liquid or bubbles in the tank, the negative pressure chamber 51 communicated by the pipe 63 is formed. However, the negative pressure is generated by the negative pressure of the negative pressure generating portion 37 of the check valve 36, and the negative pressure sucks the diaphragm 52 upward in the drawing against the spring 53,
The piece 54 integrated therewith is lifted to remove the pin 55 from the concave portion 57 of the push rod 56. As a result, the valve rod 43 released from the pin 55 is moved to the left in the figure by the urging force of the spring 41 with the pin 55, and the main valve 42 is brought into contact with the valve seat 38 to be closed. Stop refueling (Fig. 6 iv).

In this state as well, the small valve 73 is located on the right side in the drawing, so that the main valve chamber 39 communicates with the cylinder tip portion 32 through the through holes 76 and 75. The amount of fuel oil used is negligible compared to the amount of fuel oil when the main valve 42 is open.

In this state, the refueling stop detecting means 83 immediately detects the refueling stoppage and sets the timekeeping means 84 by a signal because the input of the flow rate pulse from the flow rate pulse transmitter 24 sharply decreases. The solenoid valve 10 is closed. The closing of the solenoid valve 10 cuts off the supply of fuel oil to the nozzle. On the other hand, even in this state, the refueling lever 61
The main valve chamber 39 communicates with the cylinder tip portion 32 through the through holes 76 and 75, and the hydraulic pressure acting on the cylinder tip portion 32 is Let go. As a result, the valve seat 38 whose hydraulic action is released by closing the solenoid valve 10 pushes the main valve 42 rightward in the drawing by the urging force of the spring 46, and moves forward. To engage with the push rod 56 of the valve rod 43 (FIG. 6V).

Then, after a lapse of a predetermined time from this state, that is, two to three seconds until the bubble disappears, the solenoid valve driving means 85 responds to the signal from the time counting means 84 by the solenoid valve driving means 85.
Release 0 again. As a result, the liquid flowing into the main valve chamber 39 causes the valve seat 38 to retreat to the left in the drawing against the spring 46 to separate the main valve 42 and the valve seat 38 and to start the refueling operation again (FIG. 6 iii).

After the refueling is resumed, the air flow pipe 3
When the opening 35a of 5 is closed by the foam, the automatic valve closing mechanism 50 closes the main valve 42 and stops refueling by the above-described process. When such an operation is repeated three or four times, the solenoid valve driving unit 85 regards the vehicle fuel tank as being full, and thereafter keeps the solenoid valve 10 closed without outputting a signal.

When the lever 61 is released from the latch 88, the operating rod 70 is pressed leftward in the figure by the lever 61, so that the through hole 75 of the main valve 42 is closed by the small valve 74, and the fuel oil flows out. Is prevented (FIG. 6i). When the nozzle 16 is returned to the nozzle hook, when the nozzle 17 of the other oil supply device 2 is removed and the oil supply operation is being performed, the pump control means 87 operates the pump 5 as it is, and Is set to the nozzle hook, the pump 5 is stopped.

In this embodiment, a description has been given of a case where a pump is accommodated in an oil storage tank and the oil is supplied to a plurality of oil supply devices by a fuel oil supply pipe from the pump. However, as shown in FIG. And a plurality of flow meters 12, 1.
It is apparent that the same effect can be obtained by using the nozzles 16 and 17 for automatic refueling in the multi-nozzle type refueling device 104 for supplying fuel oil to the fuel tank 3.
Further, in the above-described embodiment, an example has been described in which liquid is supplied to a plurality of refueling mechanisms by a common pump.
It is apparent that the same effect is achieved even when applied to a refueling device in which one pump is connected to one refueling nozzle.

[0023]

As described above, according to the present invention, in the state where the lever is pulled, the communication state between the main valve chamber and the cylinder tip is secured by a small flow path, and the automatic When the valve is closed, the hydraulic pressure in the main valve chamber is released to the cylinder tip side, and the movement of the valve seat for reconnecting the main valve to the lever can be reliably performed.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a refueling facility to which an automatic refueling nozzle of the present invention is applied.

FIG. 2 is a sectional view showing an embodiment of the automatic refueling nozzle of the present invention.

FIG. 3 is a top view showing one embodiment of the automatic refueling nozzle of the present invention.

4 (a) and 4 (b) show the structure of a small valve, respectively.
It is a figure shown in a non-refueling state and a refueling operation state.

FIG. 5 is a block diagram showing an embodiment of a control device of the above device.

FIGS. 6 (i) to 6 (v) are explanatory views showing the operation of the above device.

FIG. 7 is a diagram showing another application example of the present invention.

[Explanation of symbols]

 1, 2 Refueling device 5 Pump 10, 11 Solenoid valve 12, 13 Flow meter 16, 17 Refueling nozzle 24, 25 Flow pulse transmitter 32 Cylinder tip 36 Check valve 37 Valve seat 42 Main valve 50 Automatic valve closing mechanism 73 Small valve 75 , 76 through hole

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B67D 5/00-5/70

Claims (1)

(57) [Claims] 1. A lever which is removably engaged via a locking member, abuts against a valve seat by the urging force of a first spring, and retreats from the valve seat by raising the lever. A main valve that moves, an automatic valve closing mechanism that detects the liquid level in the tank, disengages the main valve and the lever from the locking member and abuts the main valve on the valve seat, In response to the hydraulic pressure, the main valve is displaced in a direction to separate from the main valve, and when the liquid supply pressure is released, the main valve is pressed and displaced in the direction of the main valve by the urging force of the second spring, and the main valve is again moved to the lever. The main valve is provided with a passage communicating with a cylinder tip, the passage is opened by pulling up the lever, and is urged by a spring in a direction to always open the passage. A small valve,
An automatic refueling nozzle configured to release fluid pressure in a region between the valve seat and the main valve to a cylinder tip side when the valve is closed by the automatic closing mechanism.