JPH0684200B2 - Liquid supply nozzle of liquid supply device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a self-closing type liquid supply nozzle in which a valve is automatically closed when a liquid level is detected, and more particularly to a liquid supply nozzle of a suspension type liquid supply device. .

[Prior Art] A self-closing type liquid supply nozzle is known (for example, JP-A-61-273396 by the present applicant).

This liquid supply nozzle is shown in FIG. 4 and a second embodiment of the present invention.
The description will be made with reference to the publicly known portions of FIGS.

3 and 4, the liquid passage 12 formed in the main body 11 of the liquid supply nozzle 10 is provided with a nozzle valve 13 and a check valve 14 having a small hole 49 communicating with the liquid passage 1. A nozzle portion 10a is attached to the end of the main body 11.

The valve rod 15 of the nozzle valve 13 is slidably accommodated in a long hole 16 formed in the main body 11, and is a valve spring interposed between a cap 17 attached to the end and a cap 18 of the main body. It is urged in the valve closing direction by 19. The valve rod 15 is formed with a long rectangular hole 20 and a through hole 21 that connects the long rectangular hole 20 to the cap 17 side in the vertical direction, and the long rectangular hole 20 has a nozzle lever pivotally supported by a pin 22.
23 is penetrated, and the lock pin 24 is inserted in the through hole 21. The end of the nozzle lever 23 protruding from the main body 11 is bent into a hook shape and is locked by a latch 26 provided in the frame 25. The lock pin 24 is the lock pin 24.
A spring 27 interposed between the cap 17 and the cap 17 urges the nozzle lever 23 to abut. These valve rod 15
Each of the lock pin 24 and the lock pin 24 is formed with a slit 29 and a groove 30 which form a common recess 28 when the nozzle valve 13 is closed, and at least two rollers 31 are slid into the recess 28.
The groove 29, the groove 30 and the roller 31 are engaged with each other.
When the roller 31 is engaged with both the slit 29 and the groove 30, the lock pin 24 and the valve rod 15 are connected via the roller 31, and when the nozzle lever 23 is rotated counterclockwise,
That is, when the nozzle lever 23 is pulled, the nozzle valve 13 is opened via the lock pin 24, the roller 31 and the valve rod 15,
When 31 engages only slot 29, lock pin 24
And the valve rod 15 are released from each other, and even if the nozzle lever 23 is pulled, the lock pin 24 moves only against the spring 27, the valve rod 15 does not move, and the nozzle valve 13 does not open, and the nozzle valve
When the valve 13 is opened, the roller 31 slips out of the groove 30 and slides 29
The valve stem 15 is moved by being biased by the valve spring 19 so that the nozzle valve 13 is closed.

On the other hand, a recess formed in the body 1 in a direction orthogonal to the valve rod 15
A first diaphragm 35 and a second diaphragm 36 are attached to the 32 by a first cap 33 and a second cap 34, and the first chamber 37 and the second diaphragm 36 are attached by these diaphragms 35, 36. Second chamber by second cap 34
38 and are defined. The first chamber 37 has a negative pressure generating section 40 provided at the check valve 14 via a passage 39,
The second chamber 38 is connected to the liquid level detection unit 42 provided at the end of the nozzle portion 10a via the communication pipe 41, and the second chamber 38 is connected to the liquid path 12 via the passage 43, and A throttling or orifice 50 is provided.

A roller guide 44 is attached to the first diaphragm 35, and the roller guide 44 is attached to the lower end of the fork formed by the roller 31.
Are movably provided in the axial direction of the valve rod 15. In the roller guide 44, the roller 31 is recessed by the first spring 45 interposed between the roller guide 44 and the first cap 33,
That is, it engages with both the slit 29 and the groove 30 to connect the valve rod 15 and the lock pin 24.

A center cap 46 is attached to the second diaphragm 36, and the center cap 46 is fixed to the roller guide 44 by a second spring 47 interposed between the center cap 46 and the first cap 33. Set center pin 48
The roller guide 44 engages the roller 30 only with the slit 29 to release the connection between the valve rod 15 and the lock pin 24. A gap C is formed in the center cap 46 to allow the center pin 48 to move upward, and the urging force of the second spring is set to be larger than the urging force of the first spring 45. .

Next, the operation will be described.

The liquid pressure is not applied to the liquid passage 12 before the liquid transfer is started. Therefore, since no hydraulic pressure is applied to the second chamber 38, the center cap 46 is urged by the second spring 47 to resist the center pin 48, against the first spring 45, as shown in FIG. The roller 31 is pulled up via the roller guide 44 and engaged only with the slit 29 to release the connection between the valve rod 15 and the lock pin 24.
Therefore, even if the nozzle lever 8 is pulled, the lock pin 24 only moves and the nozzle valve 13 does not open.

When a preset amount, for example, 10 is input to the control device by the preset switch, the motor rotates to drive the pump, and the main valve opens to start liquid transfer, which causes the second chamber to flow through the liquid passage 12. Liquid pressure is applied to 38, for example, 2 kg / cm ² . Therefore, as shown in FIG. 4, the second diaphragm 36 bulges downward against the second spring 47, and moves downward until the center cap 46 contacts the first cap 33. Therefore, the center pin 48 is urged by the first spring 45 and descends to engage the roller 31 with the slit 29 and the groove 30 via the roller guide 44 to connect the valve rod 15 and the lock pin 24.
Here, when the nozzle lever 23 is pulled and locked by the latch 26, the valve rod 15 moves to open the nozzle valve 13, pushes the check valve 14 open, and the liquid flows to start the liquid supply. As a result, the pressure in the second chamber 38, that is, the liquid path 12 drops to 0.83 kg / cm ² , for example,
The liquid is discharged from the liquid supply nozzle 10 at a flow rate of 50 / min, for example.

When the tank is full before the preset amount 10, the negative pressure generated in the negative pressure generating section 40 by closing the liquid level detecting section 42 is applied to the first chamber 37 via the passage 39. As a result, the first diaphragm 35 bulges upward, resists the first spring 45, pulls up the roller 31 via the roller guide 44, and engages only the slit 29 with the lock pin 24 and the valve rod 15. To release. Therefore, the valve rod 15 is moved by being biased by the valve spring 19 to close the nozzle valve 13.

When the preset amount is slightly before, for example, 9.5, the control device closes the main valve by one stage and throttles the flow rate to, for example, 5 / min. At this time, a large amount of liquid flows from the liquid supply nozzle 10 due to inertia, so that the pressure in the liquid passage 12 temporarily decreases, and the operating pressure of the second diaphragm 36, that is, the second diaphragm is changed to the second diaphragm.
The pressure to be positioned in the position shown, for example 0.07 to
Approaches 0.08kg / cm ² . However, since the orifice 43 is provided in the passage 43, the resistance of the orifice 50 does not cause immediate transmission to the second chamber 38, and during that time, the pressure in the liquid passage 12 immediately becomes the normal pressure when the one-stage valve is closed, for example, Return to 0.2kg / cm ² . Therefore, the second chamber 38 is maintained at 0.2 kg / cm ² during the liquid supply of the first-stage throttle, and the second diaphragm 36 is actuated to prevent the nozzle valve 13 from closing.

When the preset amount is 10, the control device closes the main valve by two-stage valve, that is, fully closes the liquid supply to stop. This causes the pressure in the liquid passage 12 to drop, so that the check valve 14 closes, but the liquid in the liquid supply hose flows out from the small hole 49 of the check valve 14. When the pressure in the liquid passage 12, that is, the second chamber 38, drops to 0.07 to 0.08 kg / cm ² after a short time, for example, about 1 second, as shown in FIG. 3, the second diaphragm 36 causes the second spring 47 to move. Is urged to bulge upward, so that the center cap 46 is
The roller 31 is pulled up via the center pin 48 and the roller guide 44 against 45, and is engaged only with the slit 29 to release the connection between the valve rod 15 and the lock pin 24. Therefore, the valve rod 15 is a valve spring.
It is moved by being biased by 19, and the nozzle valve 13 is closed.

This liquid supply nozzle itself is effective, but when it is used in a suspension type liquid supply device, even if the main valve is closed at the end of preset refueling, the top of the discharge pipe 72 (Fig. 1) and the liquid path 12 The second diaphragm 36 cannot bulge upward while the weight of the liquid up to the time is being applied to the second chamber 38. That is, the nozzle valve 13 is not closed until the liquid flows out of the nozzle and the liquid pressure applied to the diaphragm 36 falls below a certain level. Further, when the nozzle valve 13 is closed in this way, more than the preset amount is discharged, and the vicinity of the top of the discharge pipe 72 becomes vapor, so that the next oil supply amount becomes less than the preset amount.

Japanese Patent Publication No. 41-13554 discloses a nozzle having a check valve. However, since such a known technique is not used for the suspension type liquid supply device, in the suspension type liquid supply device, even if the main valve is closed, the valve is opened due to the pressure in the liquid passage, which is inconvenient.

Further, a technique of automatically closing when the pressure of liquid exceeds a certain pressure is disclosed, for example, in Japanese Patent Publication No. 63-6439 and Japanese Patent Publication No. 39-12170, both of which are rear drip in a suspension type liquid supply device. And weighing error cannot be prevented.

[PROBLEMS TO BE SOLVED] Accordingly, an object of the present invention is to provide a liquid supply nozzle of a liquid supply device in which a hanging liquid supply device performs a preset liquid supply operation, and at the end of which a drooping from the nozzle or a measurement error does not occur. There is.

[Means for Solving the Problem] According to the present invention, a pump, a flow meter, and a main valve are sequentially connected by a pipe, and after the pipe and the canopy provided above the site of a gas station are started up, the canopy is connected to the canopy. It is introduced into the attached hose processing device, the liquid supply hose connected to the pipe is hung from the hose processing device, a liquid supply nozzle is attached to the lower end of the liquid supply hose, and after the predetermined amount of liquid is supplied, the original In a liquid supply nozzle of a liquid supply device in which a valve is closed to set a liquid supply amount in the vicinity of the liquid supply nozzle, a nozzle valve is provided in an internal liquid passage and the nozzle valve is held in an open position. A nozzle lever is provided, and a liquid level detection unit is provided at the end of the nozzle portion of the liquid supply nozzle. The liquid level detection unit is connected to the first chamber of the nozzle valve opening / closing mechanism via a communication pipe, and the communication pipe Communicates with the negative pressure generating part provided in the liquid passage, A first diaphragm provided in the first chamber is provided with a means for engaging the valve rod of the nozzle valve, and a second chamber having the second diaphragm is provided with a fluid passage communicating with the upstream side of the nozzle valve. A second diaphragm for holding the engagement means in the engagement position by the pressure of the liquid passage, and a spring for closing the valve body against the weight of the liquid on the upstream side. A check valve having a spring with a constant number is provided.

[Explanation of Action and Effect] Therefore, when preset refueling is completed, the main valve is closed and the liquid supply is stopped. At that time, the valve is closed against the weight of the liquid from the top of the canopy, that is, the discharge pipe to the liquid supply nozzle. As a result, the fluid pressure in the fluid path drops, and the weight of the fluid is not applied to the second chamber having the second diaphragm, so that the engagement means is released and the nozzle valve is closed.

As described above, according to the present invention, when the main valve is closed, the influence of the weight of the liquid in the pipe including the hose can be eliminated and the nozzle valve can be immediately closed. Even in this case, it is possible to prevent a dripping of the liquid from the nozzle and a metering error caused by careless rotation of the flowmeter.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a liquid supply device equipped with a liquid supply nozzle 80 embodying the present invention. An office B is provided on a site A of a gas station, and a hose processing device 61 is provided on a canopy 60 of the gas station. Has been. A hose reel 63 driven by a hose reel motor 62 is housed in the hose processing device 61, and a liquid supply hose 64 is wound around the hose reel 63. A liquid supply nozzle 80 is provided at the tip of the liquid supply hose 64, and a switch box 65 is provided near the tip thereof. This switch box 65 has a preset switch 66, a reset switch 67 and a lift switch 68.
Is provided.

On the other hand, a suction pipe 69 extending from an oil storage tank (not shown) is provided with a pump 71 driven by a pump motor 70,
The pump 71 has a discharge pipe 72 connected to a liquid supply hose 64.
Are connected. The discharge pipe 72 is provided with a flow meter 74 having a flow rate pulse transmitter 73 and a main valve 75. The motor 70, a preset switch 66, a reset switch 67, a lift switch 68, a motor 62, and a flow rate pulse transmitter. 73 and original valve
75 is connected to a control device 76 provided in the office B, and the control device 76 is provided with a refueling amount provided on the wall surface of the office B.
A display 77 for displaying the preset amount is connected.

2 and 3 show a liquid supply nozzle 80 embodying the present invention, and the same reference numerals are given to the publicly known portions described above, and the duplicated description will be omitted.

In the figure, one end of an elbow 82 is connected to the main body 11 via a swivel 81, and the other end of the elbow 82 is connected to a connector 84 to which a liquid supply hose 64 is connected via a swivel 83. On the elbow 82 side of this connector 84, the entire code
A check valve shown at 85 is provided. The check valve 85 is a valve body 86 that is seated on the valve seat 84a of the connector 84.
And a spring 87 stretched between the valve body 86 and the elbow 82. The spring constant of the spring 87 is set to such a value that the valve body 86 is closed against the weight of the liquid between the top of the discharge pipe 72 and the valve seat 84a when the main valve 75 is fully closed.

Therefore, when the preset refueling is finished and the main valve 75 is closed and the fluid pressure of the fluid supply hose 64 drops, the check valve 85 is closed. Therefore, the hydraulic pressure in the liquid passage 12 rapidly drops, and the second diaphragm 36 bulges upward as described above to release the connection between the valve rod 15 and the lock pin 24. Therefore, the valve rod 15 is moved by being biased by the valve spring 19 to close the nozzle valve 13.

[Effects of the Invention] As described above, according to the present invention, the following effects can be achieved.

(I) In the suspension type liquid supply device, the check valve bears the weight of the liquid on the upstream side of the check valve at the time of closing the main valve, which is inevitable, so that the main valve can be closed rapidly.

(Ii) No drooping or weighing error.

(Iii) Since the main valve can be closed rapidly, the end of refueling becomes a speedy day.

[Brief description of drawings]

FIG. 1 is an overall explanatory view showing a liquid supply device equipped with a liquid supply nozzle according to the present invention, FIG. 2 is an orthogonal sectional view of FIG. 3 showing an embodiment of the present invention, and FIG. FIG. 4 is a side sectional view showing the liquid supply nozzle of FIG. 4, and FIG. 4 is an orthogonal sectional view of a conventional oil supply nozzle. 13 …… Nozzle valve, 15 …… Valve rod, 24 …… Lock pin, 28…
… Concave, 29 …… Valve rod slot, 30 …… Lock pin groove,
31 …… Roller, 35 …… First diaphragm, 36 …… Second
Diaphragm, 37 …… first chamber, 38 …… second chamber, 40
…… Negative pressure generating part, 42 …… Liquid level detecting part, 64 …… Liquid supply hose, 80 …… Liquid supply nozzle, 82 …… Elbow, 85 …… Check valve

Claims (1)

[Claims] 1. A pump, a flow meter, and a main valve are sequentially connected by a pipe, and the pipe and the hose treatment device attached to the canopy which is provided above the site of a gas station and is started up are introduced. Then, suspend the liquid supply hose connected to the pipe from the hose processing device, attach the liquid supply nozzle to the lower end of the liquid supply hose, and after supplying a predetermined amount of liquid, close the main valve to adjust the liquid supply amount. In a liquid supply nozzle of a liquid supply device in which a preset switch to be set is provided in the vicinity of the liquid supply nozzle, a nozzle valve is provided in an internal liquid passage, and a nozzle lever for holding the nozzle valve in an open position is provided. Is provided with a liquid level detection unit at the end of the nozzle part, and the liquid level detection unit is connected to the first chamber of the nozzle valve opening / closing mechanism via a communication pipe, and the communication pipe is provided with a negative pressure provided in the liquid passage. It communicates with the generating part, the first
The first diaphragm provided in the chamber is provided with a means for engaging with the valve rod of the nozzle valve, and the second chamber having the second diaphragm is provided with a fluid passage communicating with the upstream side of the nozzle valve. The second diaphragm holds the engagement means in the engagement position by the pressure of the liquid passage, and has a spring constant that closes the valve body against the weight of the liquid on the upstream side. A liquid supply nozzle of a liquid supply device, comprising a check valve having a spring.