JPH0771997B2 - Liquid supply device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a preset liquid supply device having a liquid supply nozzle capable of switching a flow rate stepwise.

(Prior Art) In a gas station or the like, it is necessary to supply a specified amount of liquid according to the customer's request, and in order to automatically perform this type of liquid supply, JP-A-57-204896, etc. It is necessary to provide a liquid supply device as shown in FIG. 1, that is, a liquid supply device that can perform preset liquid supply by controlling opening and closing of a valve arranged in the measuring machine based on the liquid supply amount.

For this reason, at a gas station that has used a non-preset type weighing machine, there is a problem that the above-described weighing machine must be replaced in order to automate preset liquid supply.

(Purpose) The present invention has been made in view of such a problem, and an object of the present invention is to provide an automatic preset liquid supply function with a slight modification to the conventional device. It is to provide a new liquid supply device.

(Means for Achieving the Purpose) That is, the present invention is, as a liquid supply device for achieving the above object, a liquid supply nozzle communicating with a liquid supply pump in a measuring device through a flow meter, and an operation lever operated. Is operated to maintain the main valve rod in the fully open position and the small open position, and to operate the main valve rod and the rod in the fully open position by operating due to the increase in the hydraulic pressure in the fluid chamber communicating with the upstream pipe line of the main valve. A valve opening change mechanism that stops and operates by hydraulic pressure drop to lock the main valve rod and the rod in the small open position is provided, while the metering device side compares the preset amount and the liquid supply amount to determine the difference. The liquid supply pump is temporarily stopped by the constant value signal,
A control means for stopping the liquid supply pump by a coincidence signal between the preset amount and the liquid supply amount is provided.

(Examples) Therefore, the details of the present invention will be described below based on illustrated examples.

FIG. 1 shows an example of an automatic nozzle used in the device of the present invention. The nozzle body 1 is roughly divided into a cylinder tip portion 2, a body portion 3 and a grip portion 4, and the cylinder tip portion 2 includes
An air passage pipe 5 having one end opened near its tip is inserted, and the other end is opened into a negative pressure generating portion 7 of a check valve 6 provided in the body 3 and a diaphragm chamber 9 of an automatic valve closing mechanism 8. However, the liquid level in the tank rises due to the supply of liquid, and
When the tip of the tip 2 of the cylinder is blocked by the liquid, the negative pressure generated in the negative pressure generator 7 causes the diaphragm 10 to be deformed by suction, and the sliding rod 11 forming the fulcrum of the trigger 12 is unlocked. valve
It is configured as a conventionally known automatic valve closing mechanism that closes 16.

On the other hand, an end portion of the liquid supply hose 14 which communicates with a liquid supply pump 41 (FIG. 3) in the measuring device 40 is coupled to the rear end of the body portion 3 described above, and from this portion to the barrel tip portion 2. A main valve 16 urged by a spring 15 so as to always close the flow passage is arranged in the flow passage.

The main valve 16 can be opened and closed by the trigger 12 described above, and the opening of the main valve can be changed from the fully open state to the small open state by hydraulic operation by the liquid supply pump to narrow the liquid supply flow rate immediately before the set value. Is configured.

That is, the main valve rod 17 fixed to the main valve 16 is provided with a hole 19 having a step portion 18 in the axial direction from the lower end, and the operating rod 23 abutting the trigger 12 is provided in the hole 19 by a spring 22. When the upper end of the operating rod 23 comes into contact with the stepped portion 18 while being pushed up by the trigger 12, the main valve 16 is opened via the main valve rod 17 in a small open state. Is configured to be able to maintain. Further, these rods 17 and 23 are provided with notches 20 and 24 for engaging and disengaging a pin 36 of a valve opening degree changing mechanism 30 which will be described later, so that the trigger 12 is pulled down, that is, the main valve 12 is closed. When it is placed in the groove, the notches 20 and 24 of the rods 17 and 23 are aligned with each other so that they can be connected by a pin 36.

On the other hand, the valve opening changing mechanism 30 described above deforms the diaphragm 34 due to the decrease in hydraulic pressure caused by the stop of the liquid supply of the liquid supply pump, removes the pin 36 from the notch 24 of the rod 23, and opens the main valve 16 small. It displaces to the position, as shown in FIG.
In the liquid chamber 32 that communicates with the upstream side of the main valve 16 via the through hole 31,
A diaphragm 34, which is constantly urged by a spring 33 against the hydraulic pressure, is stretched, and a U-shaped piece 35 is fixed to the diaphragm 34. The two pins 36 that slide with are positioned in the notches 20 of the main valve rod 17 and are engaged with and disengaged from the notches 24 of the operating rod 23 to bring the main valve rod 17 and the operating rod 23 into and out of contact with each other. Is configured.

Incidentally, reference numeral 38 in the drawing indicates a latch which is locked in a state where the trigger 12 is pulled.

3 and 4 show a weighing device 40 equipped with the above-mentioned auto nozzle.
And, showing the liquid supply control device 50 disposed here,
The metering device 40 includes a liquid supply pump 41 that is driven by a pump motor 42 to feed the liquid stored in an underground tank or the like toward the nozzle body 1, and a flow meter 43 that includes a pulse transmitter 44.
And the pulse signal from the pulse transmitter 44 and the keyboard 45
A liquid supply controller 50 that controls the pump motor 42 based on a preset signal from the device and a display 46 that displays the liquid supply amount and the preset amount are provided.

Further, the liquid supply control device 50 for controlling the pump motor 42 is reset by a signal from the nozzle switch 47, and preset value storage means 51 for storing the specified liquid supply amount from the keyboard 45 as a preset value, and a nozzle switch. 47
Reset by a signal from the flow pulse generator
The counting means 52 for integrating the flow rate pulse from 44, the preset value of the preset value storage means 51 and the integrated value of the counting means 52 are compared, and the difference between them is a constant value, for example, a value corresponding to 0.5 l. The first motor stop signal a is output when it becomes, and then the second motor stop signal b is output when the integrated value reaches immediately before the set value. The pump motor 42 receives the motor stop signal a, operates, and outputs a motor start signal after a lapse of a certain time (for example, 3 seconds), the nozzle switch 47, the comparing means 53, and the time measuring means 54. And a motor control means 55 for controlling to drive and stop, and a display drive for receiving a preset value signal from the preset storage means 51 and an integrated value signal from the counting means 52 and outputting them to display them on the display 46. By means 56 It has been made.

Next, each liquid supply operation by the above-mentioned device will be described.

1 and 2 under the condition that the liquid supply nozzle body 1 is hooked on the nozzle of the measuring device 40, that is, the liquid supply pump 41 is stopped and the trigger 12 is removed. (A)
As shown in FIG. 6, the main valve 16 is biased by the spring 15 acting on its back surface to close the flow path, and the diaphragm 34 in the valve opening degree changing mechanism 30 is biased by the spring 33. The piece 35, which bulges outward in the figure, is also displaced to the right in the figure to disengage the held pin 36 from the notch 24 in the operating rod 23, but the operating rod 23 has been removed. Since it protrudes downward so as to contact the trigger 12, the notch 24 is in a position corresponding to the notch 20 of the main valve rod 17 and is in a state capable of engaging with the pin 36.

Under this condition, for example, if the nozzle body 1 is removed from the nozzle hook to fill the fuel tank of the automobile with gasoline,
The preset value storage means 51 and the counting means 52 are reset by the signal from the nozzle switch 47 to zero the display 46,
At the same time, the pump motor 42 starts the liquid feed pump 41 to start feeding gasoline from the underground tank or the like to the nozzle body 1.

Therefore, the gasoline flowing into the liquid chamber 32 through the through hole 31 deforms the diaphragm 34 inward with its liquid pressure,
The pin 36 is attached to the main valve rod 17 and the operating rod via the piece 35 which is integrated with this.
The notches 20 and 24 of 23 are engaged with each other to integrate them. Therefore, next, the keyboard 45 is operated to input a liquid supply amount of, for example, 10 l specified by the customer as a preset value into the preset value storage means 51, and then the barrel tip portion 2 of the nozzle body 1 is inserted into the liquid supply port of the automobile. Then pull trigger 12 and latch 38
, The main valve rod 17 integrated with the operating rod 23 via the pin 36 pushes up the main valve 16 against the spring 15 and opens the flow passage to, for example, discharge 45 l / min in the tank. Then, the liquid supply is started (Fig. 2 (b)).

The pulse transmitter 44 connected to the flow meter 43 by this liquid supply start
A pulse signal is output from the counting means 52 that receives this signal.
While integrating the number of pulses to display the liquid supply amount on the display 46, while outputting the integrated value signal from the comparing means 53,
It is compared with the preset value of 10 l input from the preset value storage means 51.

In this way, when the liquid supply progresses and eventually the difference between the preset value and the integrated value reaches a value corresponding to 0.5 l, for example, the first motor stop signal a output from the comparison means 53 is input to the motor control means 55. Then, the pump motor 42 is temporarily stopped.

When the pump motor 42 is stopped, the hydraulic pressure in the liquid chamber 32 is stopped, and accordingly, the diaphragm 34 urged by the spring 33 bulges outward together with the bridge 35, and the pin 36 of the operating rod 23 is urged. Cutout
Remove from 24. Therefore, the main valve rod 17 disengaged from the operating rod 23 descends until the stepped portion 18 contacts the tip of the operating rod 23, and the main valve 16 is brought into a small open state (Fig. 2). (C)).

On the other hand, the timer means 54 receiving the first motor stop signal a from the comparing means 53 outputs a motor start signal to the motor control means 55 after a lapse of some time, for example, 3 seconds, to output the pump motor. 42 is restarted and, for example, 5 liters of gasoline per minute is supplied to the tank from the flow path that is in the small open state.

Then, when the liquid supply further proceeds and the integrated value reaches just before the preset value (actually before about 0.01), the comparison means 53 outputs the second motor stop signal b to the motor control means 55 to stop the pump motor 42. Then, since all the operations of the preset liquid supply are completed, the trigger 12 is finally removed from the latch 38 to close the main valve 16, and the nozzle body 1 is hung on the nozzle to prepare for the next liquid supply.

By the way, although the preset liquid supply operation has been described above, in order to automatically perform full liquid supply, the nozzle body 1 is removed from the nozzle hook, the display 46 is reset to zero, and the pump motor 42 is started. .

As a result, the diaphragm 34 in the liquid chamber 32 is deformed inward by hydraulic pressure in the same manner as described above, and the pin 36 is fitted into the notch 24 of the operating rod 23 via the piece 35 which is integral with the diaphragm. When the trigger 12 is engaged with the latch 38 in this state, the main valve 16 moves the operating rod 23.
It is pushed up via and the flow path is fully opened, resulting in the state of FIG. 2 (b).

Then, the liquid supply proceeds in this state, and when the liquid level in the tank rises, the air passage pipe 5 opened at the tip of the cylinder tip portion 2 is closed by the bubbles formed on the liquid surface. The diaphragm 9 of the automatic valve closing mechanism 8 in communication becomes a negative pressure due to the negative pressure action of the negative pressure generating portion 7 of the check valve 6, and the negative pressure causes the diaphragm 10 to be deformed by suction and the trigger 12
The unlocking of the sliding rod 11 forming the fulcrum of the main valve is released by the spring which acts on the sliding rod 11 downwardly in FIG. Close 16 to stop the liquid supply.

(Effects) As described above, according to the present invention, the main valve rod is reduced by the hydraulic pressure so that the main valve rod is held at the fully opened position by the increase in the hydraulic pressure in the liquid chamber communicating with the upstream side of the main valve. Since it is held in the open position, the liquid supply pump is temporarily stopped when the difference between the preset amount and the oil supply amount reaches a certain value,
By simply stopping the liquid supply pump when the liquid supply amount matches the preset amount, it is possible to automatically perform the operation of changing the liquid supply nozzle from full open to small open and then to stop. In addition, the solenoid valve for presetting provided on the side of the weighing device is not required, and further simplification of the device and further safety can be achieved, and
This type of liquid supply device can be configured as a low power type device having a smaller discharge resistance.

[Brief description of drawings]

FIG. 1 is a sectional view of an automatic nozzle used in a liquid supply device of the present invention, FIGS. 2 (a) to 2 (c) are diagrams showing respective operating states thereof, and FIG. 3 is a diagram showing a measuring device, FIG. FIG. 4 is a diagram showing a liquid supply control device. 1 …… Nozzle body, 8 …… Automatic valve closing mechanism 16 …… Main valve, 17 …… Main valve rod 23 …… Operating rod, 30 …… Valve opening change mechanism 40 …… Measuring machine, 41 …… Liquid supply pump

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP 61-273396 (JP, A) JP 59-26500 (JP, A) JP 55-107693 (JP, A)

Claims (1)

[Claims] 1. A liquid supply nozzle communicating with a liquid supply pump in a metering device via a flow meter, a rod operated by an operating lever to hold a main valve rod at a fully open position and a small open position, and a main valve The main valve rod and the rod are operated by increasing the liquid pressure in the liquid chamber communicating with the upstream pipe line to lock the main valve rod and the rod in the fully open position, and are operated by decreasing the hydraulic pressure to operate the main valve rod and the rod. While a valve opening change mechanism that locks in the small open position is provided, the metering device side compares the preset amount with the liquid supply amount and temporarily stops the liquid supply pump by a constant value signal of the difference to perform presetting. A liquid supply device comprising a control means for stopping the liquid supply pump according to a coincidence signal between the amount and the liquid supply amount.