JPH05319497A - Liquid supply nozzle - Google Patents

Abstract

(57) [Summary] [Purpose] To ensure the responsiveness and certainty of operation of a liquid supply nozzle that enables repeated liquid supply. An automatic valve-closing mechanism 10 in which a push rod 25 is detachably coupled to a main valve 17 that is opened by an operating lever 26, and these are operated by detecting the liquid level in a tank.
And the main valve is closed to cut off the liquid supply, the movable valve seat 22 is pushed up together with the main valve 17 due to the decrease in hydraulic pressure, the main valve 17 is connected to the push rod 25 again, and the liquid pressure by the next liquid supply is applied. The movable valve seat 22 is pushed down to enable additional liquid supply. Particularly, by disposing the automatic valve closing mechanism 10 in the vicinity of the negative pressure generating portion 8 of the check valve 7, its responsiveness and sensitivity are improved. Things that I tried to raise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid supply nozzle of a type in which liquid is repeatedly supplied to automatically fill a tank.

[0002]

2. Description of the Related Art A valve in a tank operates an automatic valve closing mechanism to stop a liquid supply, and then returns a liquid supply nozzle to a liquid supplyable state so that some additional liquid supply is repeated. The above-mentioned valve seat moving type liquid supply nozzle has already been proposed by the applicant in Japanese Patent Publication No. 3-64398.

In the liquid supply nozzle proposed here, an automatic valve closing mechanism for engaging and disengaging the main valve rod and the push rod is arranged behind the lever, and a negative pressure provided downstream of the main valve. Since the generator and the automatic valve closing mechanism are widely separated from each other across the lever, it takes a lot of time for the negative pressure in the negative pressure generator to act on the automatic valve closing mechanism. As a result of the negative pressure also weakening, the frequency of liquid level detection increases with each additional liquid supply,
Moreover, if the amount of liquid supply is gradually reduced, the response after liquid level detection becomes even more sluggish at the final stage, and sometimes an overflow accident may occur.

Further, in this liquid supply nozzle, in order to operate the push rod located behind the lever, a structure in which a long groove is provided in the main valve rod and the lever is inserted therethrough must be adopted. When dust or the like is clogged between the long groove and the lever, the lever is easily dragged by the main valve rod and disengages from the notch to make it impossible to supply additional liquid.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to further solve such a problem, and an object of the present invention is to provide good responsiveness after liquid level detection and ensure additional liquid supply operation. An object is to provide an improved liquid supply nozzle.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has a direction in which the lever is opened / closed via a detachable pressing member and is always in contact with a movable valve seat. A movable valve that is biased toward the main valve and a movable valve that is displaced in the direction away from the main valve by receiving the liquid supply pressure, is released in the direction of the main valve when the liquid supply pressure is released, and engages the main valve with the pressing member In a liquid supply nozzle having a seat, a pressing member is interposed between the main valve and the lever, and the pressing member is separated from the main valve by an automatic valve closing mechanism arranged near the negative pressure generating portion of the check valve. It was done like this.

[0007]

EXAMPLES The examples shown below will be described below. 1 to 3 show a liquid supply nozzle according to an embodiment of the present invention.

The liquid supply nozzle body 1 is composed of a body portion 5 on the downstream side and a grip portion 30 on the upstream side with a main valve installation site as a boundary.

A cylinder tip portion 2 is attached to the tip of the body portion 5 on the downstream side, and an air conduit 3 opened near the tip is inserted therein, and a rear end thereof is an air passage hole provided in the body portion 5. From 6 to 6, one is in the negative pressure generating part 8 of the check valve 7 and the other is in the negative pressure chamber 11 of the automatic valve closing mechanism 10 provided near the negative pressure generating part
When the tip opening 4 of the air conduit 3 is closed by liquid or bubbles, the automatic valve closing mechanism 10 is actuated by the negative pressure acting in the negative pressure chamber 11 and the main valve 17 is closed. It is configured to close the flow path 16.

The body portion 5 includes the grip portion 30 to the barrel tip portion 2.
A flow path 16 communicating with the movable valve seat 22 which is constantly urged in the main valve direction by a valve seat spring 21 is slid at the one end opening of the body 5 joined to the grip 30 by the screw 15. It is movably mounted and is configured to seat the main valve 17 thereon.

Reference numeral 25 is a valve rod 19 via a weak compression spring 24.
The push rod 25 is slidably inserted into the push rod 25. The push rod 25 includes a pin 13 operated by a diaphragm 12 forming a part of the automatic valve closing mechanism 10 and a notch 19 ′ of the valve rod 19 and the push rod 25. 25 ′ is always connected to the valve rod 19 and the operating lever 26 acting on the outer end thereof opens and closes the main valve 17, while the negative pressure acting in the negative pressure chamber 11 causes the diaphragm 12 to move. When displaced, the main valve 17 coupled by the pin 13 is seated on the valve seat 20 by the urging force of the main valve spring 18, and the flow path 16 is closed.

On the other hand, the grip portion 30 has a front end that forms a lid portion 31 that covers the opening end of the body portion 5 on the side of the movable valve seat 22, and this edge 32 is a stopper that restricts the upward movement of the movable valve seat 22. In addition, the inside is configured as a spring receiving seat for the main valve spring 18, and the other end is a connecting portion 34 with the liquid supply hose 33.
Is doing.

Reference numeral 35 in the drawing denotes a notch for engaging the latch 28 of the operating lever 26, and 36 denotes the latch 2.
The lever which removes 8 is shown.

On the other hand, FIG. 4 shows an example of a metering device, in which the liquid feed pump 42 driven by the pump motor 43 is
The liquid stored in the underground tank or the like is configured to be sent to the nozzle body via the flow meter 41, and the liquid supply amount at this time is from the flow rate pulse transmitter 44 connected to the flow meter 41 to the control device 50 described later. Is output as a pulse signal to the display 46 and displayed on the display 46.

On the other hand, FIG. 5 shows the control device 5 described above.
0 is shown in detail, and the liquid supply control device 50 outputs a signal to the time measuring means 52 and the motor control means 53 when the pulse signal from the flow rate pulse transmitter 44 is cut off. Means 51, a timer means 52 which is set by a signal from the liquid supply stop detecting means 51, outputs a signal to the control means 53 to operate the pump motor 43 after a preset time has elapsed, and a nozzle switch 45. The pump motor 43 is operated by the signal, the pump motor 43 is stopped by the signal input from the liquid supply stop detecting means 51, and further, when the signal from the time measuring means 52 is received, for example, three to four times, the liquid supply is performed. It is reset by a signal from the motor control means 53, which is constructed so as not to accept the subsequent signals after the completion, and from the flow rate pulse transmitter 44. It is constituted by a flow pulse through the integrated display unit drive means 55 and counting means 54 for outputting the integrated value on the display 46.

Next, the liquid supply operation by the above-mentioned device will be described. The state in which the liquid supply nozzle body 1 is hung on the nozzle hook 49 of the measuring device 40, that is, the liquid supply pump 4
2 is stopped and the operating lever 26 is not operated, the movable valve seat 22 slidably attached to the body portion 5 is moved to its body as shown in FIGS. It is urged by the strong spring 21 acting on the back surface to move upward, and is in contact with the lid end edge 32. Therefore, the main valve 17, which is biased by the main valve spring 18 and is in contact with the movable valve seat 22, is also raised, and the pin 13 located in the notch 19 ′ of the valve rod 19 is
The push rod 25 is engaged with the recess 25 ′ of the push rod 25 to connect the valve rod 19 and the push rod 25.

Under this condition, for example, when the nozzle body 1 is removed from the nozzle hook 49 to fill the fuel tank of the automobile with gasoline, the counting means 54 of the control device 50 is reset by a signal from the nozzle switch 45. Indicator 4
6 is set to zero, and at the same time, the pump motor 43 drives the liquid supply pump 42 to start the liquid supply operation. For this reason, the valve seat 22 that has been lifted by being biased by the spring 21 receives the hydraulic pressure from the liquid supply pump 42 and moves down while the main valve 17 is in contact.

Therefore, when the cylinder tip portion 2 is then inserted into the liquid supply port of the tank and the operation lever 26 is pulled to engage the notch 35, the push rod 25 pushed by the lever 26 is pushed as shown in FIG. Is the valve rod 1 integrated through the pin 13.
9 is pushed up to open the main valve 17, and the liquid sent from the liquid supply pump 42 is supplied into the tank.

Then, the liquid level in the tank rises due to the subsequent supply of liquid, and when the open end of the cylinder tip portion 2 is eventually closed by the bubbles on the liquid surface, the negative pressure chamber communicating with the air conduit 3 is formed. The inside of the diaphragm 11 is subjected to a negative pressure action in the negative pressure generating portion 8 to become a negative pressure, and this negative pressure resists the spring 14 to cause the diaphragm 1
2 is deformed to the left in Fig. 2, and the pin 1 is integrated with it.
3 is removed from the recess 25 ′ of the push rod 25. As a result, the valve rod 19 released from the pin 13 is released from the pin 1
The main valve 17 is lowered by the urging force of the main valve spring 18 that acts on the main valve 17 while contacting the movable valve seat 22, and the liquid supply is stopped.

In this state, the liquid supply stop detecting means 51
Immediately detects the stop of the liquid supply, and the signal is used to measure the time.
When 2 is set, a signal is sent to the motor control means 53 to stop the pump motor 43 by this control means 53. Therefore, the movable valve seat 22 whose pressure has been released rises together with the main valve 17 by being urged by the spring 21, and at the end of the movable valve seat 22, the valve rod 19 and the push rod 25 are connected again via the pin 13.

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 means 53 causes the pump motor 43 to be restarted by the signal from the time measuring means 52. To start. As a result, the liquid that has flowed into the body portion 5 moves the movable valve seat 22 downward against the spring 21, thereby separating the main valve 17 and the movable valve seat 22 from each other and performing the liquid supply operation shown in FIG. 2 again. Let in.

After this liquid supply resuming operation, the open end 4 of the air conduit 3 is closed again by the bubbles, and the automatic valve closing mechanism 10 operating together with this closes the main valve 17 and stops the liquid supply. Repeat the operation of to perform intermittent liquid supply,
When this is repeated three or four times, the motor control means 53 considers that the inside of the tank is full, and stops the pump motor 43 without receiving the subsequent signal from the time measurement means 52, and all of them are stopped. The liquid supply operation of is completed.

[0023]

As described above, according to the present invention, the pressing member is provided between the lever and the main valve of the liquid supply nozzle which enables the repeated supply of liquid, and the pressing member is interposed therebetween. Since the main valve is operated to be opened and closed, this type of liquid supply nozzle can be made to have the same structure as a normal automatic liquid supply nozzle, that is, the structure to directly open and close the main valve by a lever. It is possible to eliminate various problems associated with the operation and to make the liquid supply nozzle more compact.

Moreover, since the automatic valve closing mechanism for releasing the engagement between the main valve and the pressing member is arranged in the vicinity of the negative pressure generating portion, the automatic valve closing mechanism responds to even a slight negative pressure generated in the negative pressure generating portion. It is possible to operate with good performance and high sensitivity, and it is possible to prevent an overflow accident that is likely to occur during repeated liquid supply.

[Brief description of drawings]

FIG. 1 is a sectional view of a liquid supply nozzle according to an embodiment of the present invention shown in a valve closed state.

FIG. 2 is a sectional view of the same nozzle shown in a valve open state.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a diagram showing an outline of a weighing device.

FIG. 5 is a diagram showing a configuration of a control device.

[Explanation of symbols]

 1 Liquid Supply Nozzle 7 Check Valve 8 Negative Pressure Generation Section 10 Automatic Valve Closing Mechanism 13 Pin 17 Main Valve 19 Valve Rod 22 Movable Valve Seat 25 Push Rod 26 Lever

Claims (1)

[Claims] 1. A main valve which is opened / closed by a lever through a detachable pressing member and is normally urged in a direction of abutting against a movable valve seat, and from the main valve which receives a liquid sending pressure. A liquid supply nozzle provided with the movable valve seat, which is displaced in a separating direction, is disengaged from the liquid supply pressure and is displaced in the main valve direction, and engages the main valve with the pressing member. A liquid supply system characterized in that the pressing member is interposed between levers, and the pressing member is separated from the main valve by an automatic valve closing mechanism arranged near the negative pressure generating portion of the check valve. nozzle.