JP2701040B2 - Liquid supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a liquid supply device capable of automatically performing a full liquid supply, that is, a so-called "full liquid supply".

(Prior Art) As shown in Japanese Patent Publication No. 51-27885, an automatic nozzle used in a gas station or the like is closed when an air flow pipe opened at the nozzle tip is blocked by liquid in a tank. The mechanism is configured to automatically operate to stop liquid supply.

However, in fact, the bubbles generated on the upper surface of the liquid block the air flow pipe and stop the liquid supply.To fill the tank, operate the lever several times to open the valve closing mechanism. There is a disadvantage that it must be reset each time.

(Problems to be Solved by the Invention) The present invention has been made in view of such inconvenience, and an object of the present invention is to provide a novel liquid supply device capable of filling the tank with a single liquid supply operation. Is to provide.

(Means for Solving the Problems) That is, according to the present invention, as a liquid supply device for achieving the above objects, a first spring having a through hole closed by a pilot valve and acting on the pilot valve and a feeder are provided. A main valve that is displaced in a direction that comes into contact with the movable valve seat in response to one or both of the hydraulic pressures; A movable valve seat which is disengaged from the biasing force of the first spring by the biasing force of the first spring and is displaced in the direction of the main valve, and opens the main valve together with the pilot valve in the valve opening direction against the biasing force of the first spring. The fulcrum pin of the manual operation lever is released by detecting the liquid level in the tank and the manual operation lever to be displaced, and the fulcrum pin is released by the manual operation lever released from the urging force of the second spring by stopping the liquid supply. It has an automatic valve closing mechanism that returns to lock again. The liquid supply nozzle obtained and a liquid supply control means for detecting the stop of liquid discharge from the liquid supply nozzle by operating the automatic valve closing mechanism, stopping the liquid supply, and starting the liquid supply after a lapse of a fixed time from the liquid supply stop. And

(Embodiment) Therefore, a description will be given based on an embodiment illustrated below.

The drawings show one embodiment of the present invention. As shown in FIGS.
An air passage pipe 5 having one end opened near the tip of the tube tip 2 is inserted into the tube tip 2, and the other end is connected to the tube body. 3 is open to the negative pressure generating section 7 of the check valve 6 and the negative pressure chamber 21 of the automatic valve closing mechanism 20.

On the other hand, the end of the hose 10 communicating with the liquid supply pump 42 (FIG. 4) in the metering device 40 is connected to the rear end of the cylinder body 3. A valve mechanism 11 for opening and closing the flow path is provided. The valve mechanism 11 is attached to the tip of the valve rod 12 and is urged downward by a weak spring 13 as a first spring so as to always contact the main valve 16. A main valve 16 having a through hole 15 that is loosely inserted and closed by a pilot valve 14,
The movable valve seat 19 is constantly urged upward by a strong spring 17 as a second spring so as to abut the back surface of the main valve 16 and close the flow passage opening 18 at the center.

20 is a diaphragm 23 due to the negative pressure generated in the negative pressure chamber 21.
The automatic valve closing mechanism 20 is a well-known automatic closing mechanism for closing the main valve 16.
It operates to close the main valve 16 when the opening end located at the tip is closed by the liquid in the tank, and has a negative pressure chamber 21 communicating with the air flow pipe 5, and a negative pressure chamber 21. A diaphragm 23 that is stretched and operates to pull up a retaining rod 22 that has been deformed and held when the inside of the chamber 21 becomes negative pressure, and is constantly retained by the retaining rod 22 via a small ball 24, When the locking rod 22 is pulled up, the locking rod 22 is unlocked by this and is constituted by a sliding rod 26 projecting downward against a spring 25. Further, a lower end of the sliding rod 26 is provided with a valve rod. A lever 30, which moves the valve mechanism 11 up and down by moving the valve 12 up and down, is slidably mounted on a pin 28 as a fulcrum.

Reference numeral 31 in the drawing denotes a latch for holding the lever 30 at the pulled position.

On the other hand, FIG. 3 shows a metering device in which members not directly related to the present invention, such as a keyboard for setting a liquid supply amount in advance and an operation button for automatic liquid supply operation, are removed. Is supplied to the nozzle body 1 via the flow meter 41 through the liquid supply pump 42, which is driven by the liquid supply pump.
Control device described later from flow pulse transmitter 44 connected to 41
It is configured to output a pulse signal to 50 and display it on a display 46.

FIG. 4 shows details of the control device 50 described above.
The liquid supply control device 50 includes a liquid supply stop detection unit 51 that outputs a signal to the timer unit 52 and the motor control unit 53 when the pulse signal from the flow rate pulse transmitter 44 is cut off, and a liquid supply stop detection unit.
A timer means 52 which is set by a signal from 51 and outputs a signal to the control means 53 to operate the pump motor 43 after a preset time has elapsed, and a pump motor 43 operated by a signal from the nozzle switch 45, The pump motor 43 is stopped by a signal input from the liquid supply stop detecting means 51, and further, when a signal of, for example, three or four times is received from the time measuring means 52, it is regarded as liquid supply end and no further signal is received. It is reset by a signal from the configured motor control means 53 and the nozzle switch 45, integrates the flow pulse from the flow pulse transmitter 44, and outputs the integrated value to the display 46 via the display drive means 55. And counting means 54.

Next, the liquid supply operation by the above-described device will be described with reference to FIG.

In the state where the liquid supply nozzle body 1 is hung on the nozzle holder 49 of the measuring device 40, that is, in the state where the liquid supply pump 42 is stopped and the lever 30 is not operated, FIG. As shown in, the movable valve seat 19 is urged by a strong spring 17 and abuts against the back surface of the main valve 16 to close its own flow path opening 18 and pushes up the main valve 16 to raise its upper edge by a pilot. valve
14 and push up the pilot valve 14 against the weak spring 13.

In this state, for example, when the nozzle body 1 is removed from the nozzle hook 49 in order to fill the fuel tank of the automobile with gasoline, the signal from the nozzle switch 45 resets the counting means 54 of the control device 50 and the display 46 To zero, and at the same time, the pump motor 43 drives the liquid supply pump 42 to start the liquid supply operation. Therefore, the movable valve seat 19 and the main valve 16, which have been urged by the spring 17 and rise, receive the liquid pressure from the liquid supply pump 42 while contacting each other, and descend, and together with this, the weak spring The pilot valve 14 urged to 13 also moves down, and the flow path opening 18 of the movable valve seat 19 remains closed (FIG. 2 (ii)).

Therefore, when the cylinder tip 2 is next inserted into the liquid supply port of the tank and the lever 30 is pulled and hooked on the latch 31, the valve rod 12 pushed up by the lever 30 is initially released by the pilot against the weak spring 13. Main valve 16 pushed up by valve 14 and pushed down by hydraulic pressure
A gap is formed between them, from which the fluid flows downward through the through hole 15 to reduce the hydraulic pressure, and then the main valve 16 is pushed up to move the movable valve seat 19.
Is opened (FIG. 2 (iii)). Therefore, the liquid sent from the liquid supply pump 42 flows from the negative pressure generating part 7 of the check valve 6 to the cylinder tip part 2, and further flows into a tank (not shown). On the other hand, when the liquid supply is started in this way, a negative pressure is generated in the negative pressure generating section 7 of the check valve 6 by a Venturi effect, and the inside of the air flow path pipe 5 opened here is made negative. The open end of the tube 5 on the side of the tube tip 2 is in the atmosphere and sucks air.
At this point, the inside of the negative pressure chamber 21 of the automatic valve closing mechanism 20 is at the atmospheric pressure.

When the liquid level in the tank rises due to the subsequent liquid supply, and when the opening end of the cylinder tip 2 is closed by a bubble on the liquid surface, the inside of the negative pressure chamber 21 communicating with the air flow path pipe 5 is reduced. The negative pressure generated by the negative pressure generating section 7 generates a negative pressure, and the diaphragm 23 deformed by the negative pressure pulls up the integral locking rod 22 and locks it via the small ball 24. Unlock the sliding rod 26. As a result, the lever 30 whose free end is locked to the notch 31 loses the fulcrum of the sliding rod 26, so that the pilot valve
The main valve 16 is lowered together with the urging force of the spring 13 acting on the valve 14 and the back surface thereof is brought into contact with the movable valve seat 19 to close the passage opening 18 (FIG. 2 (iv)).

In this state, the liquid supply stop detecting means 51 immediately detects the liquid supply stop, sets the timer means 52 based on the signal, and sends a signal to the motor control means 53 so that the pump motor 43 To stop. For this reason, the movable valve seat 19 from which the hydraulic pressure has been released is pressed by the strong spring 17 so that the main valve 16, the pilot valve 14 and the valve
The sliding rod 26 which rises with the lever 12 and releases the downward force of the valve rod 12 via the lever 30 is a spring acting on itself.
The small ball is raised again by the locking rod 22 integrated with the diaphragm 23, which has been raised by the urging force of 25 and returned to its original state by stopping the liquid supply.
Locked via 24 (FIG. 2 (v)).

Then, when a preset time from this state, that is, a time of two to three seconds until the hour disappears, the motor control means 53 receives a signal from the time keeping means 52 and the pump control means 53
Start 43 again. As a result, the liquid flowing into the cylindrical body 3 lowers the movable valve seat 19 again against the spring 17 to separate the movable valve seat 19 from the main valve 16 to open the flow path opening 18,
It returns to the liquid supply state again (FIG. 2 (iii)).

Then, after the liquid supply restarting operation, the opening end of the air flow path pipe 5 on the cylinder tip 2 side is closed again by the hour, and the automatic valve closing mechanism 20 operated together with this lowers the valve rod 12 via the lever 30, When the liquid supply is stopped by bringing the main valve 16 lowered together with the pilot valve 14 onto the movable valve seat 19 (see FIG. 2 (i
v)) Thereafter, the above operation is repeated to perform intermittent liquid supply. When this operation is repeated several times, the motor control means 53 considers that the tank is full, stops the pump motor 43 without receiving the subsequent signal from the timekeeping means 52, and stops all pumps. Terminate the liquid operation.

By the way, in the above description, the main liquid supply and the additional liquid supply are performed with the same discharge amount, but the discharge amount from the liquid supply nozzle main body 1 is changed according to a signal from the timer 52, for example, 45 / min, 25 / m for the first additional liquid supply
In, the rotation speed of the pump motor 43 may be changed so as to be 15 / min at the time of the second additional liquid supply.

Further, in this embodiment, the pump motor 43 is stopped by the signal from the liquid supply stop detecting means 51 to stop the liquid supply. However, the control is performed in the pipe system from the liquid supply pump 42 to the nozzle body 1. It is also possible to provide a valve so that the control valve performs a liquid feeding stop operation.

Although the automatic liquid supply operation has been described above, in the apparatus according to the present invention, the lever 30 can be manually opened and closed as needed to supply a desired amount of liquid. It is also possible to provide a preset liquid supply so that the main liquid supply operation is terminated when the amount of liquid supply is reduced from the stored value input in advance and the remaining number becomes zero.

(Effect) As described above, according to the present invention, a through hole closed by a pilot valve is provided, and the valve receives a biasing force of one or both of a first spring and a liquid supply pressure acting on the valve. The main valve that contacts the movable valve seat, the movable valve seat that is separated from the main valve by receiving the liquid pressure, is released from the liquid pressure, and is displaced in the direction of the main valve, and the main valve is opened via the pilot valve A liquid supply nozzle equipped with an automatic operation lever to perform locking of the fulcrum pin of the lever by detecting the liquid level in the tank, and an automatic valve closing mechanism to lock the fulcrum pin of the lever again by stopping the liquid supply. On the other hand, since the automatic valve closing mechanism detects the stop of the discharge from the liquid supply nozzle and stops the liquid supply and starts the liquid supply after a lapse of a predetermined time, the liquid supply control means is provided. Only smooth transition from start to supply However, even if the automatic valve closing mechanism is activated due to pseudo fullness such as rising of bubbles generated during liquid supply, the urging force of the first spring acting on the lever is applied via the movable valve seat and the main valve. This automatic valve closing mechanism can be returned again by releasing by the second spring, and the liquid supply can be automatically stopped at the time of pseudo full or true full without using any means such as a timer. It is possible to detect the suspension of the liquid from the liquid supply nozzle in a simple and reliable manner based on the pulse signal from the flow rate pulse transmitter and the like.

[Brief description of the drawings]

FIG. 1 is a side view showing a cross section of a liquid supply nozzle according to an embodiment of the present invention, FIGS. 2 (i) to (v) are explanatory views showing the liquid supply operation, and FIG. FIG. 4 is a schematic diagram showing a control device. 1 ... liquid supply nozzle body, 12 ... valve rod 14 ... pilot valve, 16 ... main valve 19 ... movable valve seat, 20 ... automatic valve closing mechanism 30 ... lever, 40 ... measuring device 42 ... ... Supply pump

Claims (1)

(57) [Claims] The present invention has a through-hole closed by a pilot valve, and receives a biasing force of one or both of a first spring and a liquid sending pressure acting on the pilot valve, in a direction in which the movable valve seat comes into contact with the movable valve seat. The displaced main valve is displaced in a direction away from the main valve in response to the liquid supply pressure, the liquid supply pressure is released, and the urging force of the second spring is released from the urging force of the first spring. A movable valve seat that is displaced in the direction of the main valve, a manually operated lever that displaces the main valve in the valve opening direction together with the pilot valve against the urging force of the first spring, and a liquid level detection in the tank To release the fulcrum pin of the manual operation lever, and return to lock the fulcrum pin of the manual operation lever again by the manual operation lever released from the urging force of the second spring by stopping the liquid supply. Liquid supply nozzle having an automatic valve closing mechanism that performs Liquid supply control means for detecting the stop of the discharge of the liquid from the liquid supply nozzle by operating the automatic valve closing mechanism, stopping the liquid supply, and starting the liquid supply after a lapse of a fixed time from the stop of the liquid supply. Liquid device.