JPH0617154B2 - Auto nozzle with flow control mechanism - Google Patents

Description

The present invention relates to an auto nozzle having a flow rate control mechanism.

(Prior Art) A refueling device installed at a gas station or the like is usually composed of a computer and an automatic nozzle that communicates with a liquid supply pump in a weighing machine.
No. 57-204896, an automatic valve closing mechanism is provided, which operates by closing an air passage pipe opened at the tip of a nozzle with liquid as seen in JP-A-27885. As seen in, etc., a counting circuit that counts pulse signals according to the liquid supply amount, and a liquid supply pipe that operates when the liquid supply amount reaches an integer value or when the liquid supply amount reaches a preset value A control valve is provided to close the passage.

Therefore, in the conventional refueling devices, a control valve operated by the count amount and a valve operated by the liquid level in the tank are provided in the flow path from the liquid supply pump to the tip of the auto nozzle, which causes pressure loss and control. There has been a problem that the amount of liquid supplied may be in error due to the deformation of the hose from the valve to the auto nozzle.

(Purpose) The present invention has been made in view of such a problem, and an object thereof is to provide a flow rate control function in addition to the original automatic liquid supply stop function to reduce pressure loss and to reduce the hose bulge. It is to provide a new auto nozzle that does not cause an error.

(Means for Achieving the Purpose) That is, the present invention acts on the air from the pressurized air supply source acting on the piston fixed to the rear end or the tip as an auto nozzle for achieving the above-mentioned object. A piston rod that is axially displaced so as to displace the valve rod to the pipe line open position by receiving the pressing force of one of the levers, a valve rod that is always urged in the direction to close the pipe line by a spring, and a cylinder tip. Communicating with the air flow path pipe that opens in the vicinity of the tip of the part and the negative pressure generating part of the cylinder body, displaces due to the negative pressure generated in the pipe, and disengages the valve rod and the piston rod at the pipe line open position, Moreover, an automatic valve closing mechanism for engaging the valve rod and the piston rod at the closed position of the conduit at the time of return is provided.

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

The drawings show an embodiment of the present invention, in which the nozzle body 1
Is roughly divided into a cylinder tip portion 2, a cylinder body portion 3, and a grip portion 4, and an air passage pipe 5 having one end opened near the tip of the cylinder tip portion 2 is inserted into the cylinder tip portion 2. The other end is open to the negative pressure generating portion 7 (FIG. 2) of the check valve 6 provided in the barrel portion 3 and the negative pressure chamber 17 of the automatic valve closing mechanism 16.

On the other hand, the above-mentioned barrel body 3 has a weighing device 40 on its side surface.
The end portion of the hose 10 communicating with the liquid supply pump 42 (FIG. 4) inside the hose 10 is coupled to the passage reaching the tube end portion 2 from here, and the passage 11 is always closed by the spring 11 via the valve rod 13. A main valve 12 biased in such a manner is arranged, and a check valve 6 forming a negative pressure generating portion 7 of the air passage pipe 5 is arranged opposite to the downstream side thereof. Further, as shown in FIG. 2, an automatic valve closing mechanism 16 for closing the main valve by deforming the diaphragm 18 by the negative pressure generated in the negative pressure chamber 17 is provided on the side surface of the barrel body 3. There is. That is, JP-A-52-1
As in the mechanism disclosed in Japanese Laid-Open Patent Publication No. 51919, the negative pressure chamber 17 communicating with the air flow pipe 5 is provided with a diaphragm 18 which is constantly urged outward by a spring 19 and is attached to the diaphragm 18. A piece 20 having a U-shape as shown in FIG. 3 is fixedly provided, and two pins 22 which slide in the long holes 21 of the piece 20 are provided in a part of the valve rod 13. Lack 1
4, the valve rod 13 is engaged with and disengaged from the recess 25 of the piston rod 24 inserted into the valve rod 13.
And the piston rod 24 are brought into contact with and separated from each other.

By the way, the above-mentioned piston rod 24 has a function of operating by air pressure to open and close the main valve 12, and the end portion of the piston rod 24 slides in the cylinder 28 provided in the barrel portion 3. A piston 26 is integrally attached, and the tip of the rod 24 is in contact with the back of a lever 31 whose one end is pivotally supported by a pin 30,
When the spring 27 acting on the piston 26 always urges the lever forward, when pressurized air is supplied into the cylinder 28 from the pipe 33 communicating with the pressurized air supply source 47 in the measuring device 40, The air pressure is configured to release the biasing force applied to the lever 31.

FIG. 5 shows a control device 50 for controlling the amount or pressure of the pressurized air supplied into the cylinder 28. The control device 50 includes an automatic liquid supply operator 62 and a preset operator 63. Liquid supply start detecting means 5 which is set by the signal of No. 5 and is output when the flow rate pulse signal from the pulse transmitter 44 is inputted at the time of setting and is reset by receiving the signal when the nozzle switch 45 is turned off.
1 and a signal from the liquid supply stop detection means 52, which is set by a signal from the liquid supply start detection means 51 and outputs a signal when the input of the flow rate pulse signal from the pulse transmitter stops. And the liquid supply start detecting means 5 which is set by the timer and outputs a signal after a set time.
The flow rate control valve 48 is fully opened by the first signal input from No. 1, the flow rate control valve 48 is closed by the signal input from the liquid supply stop detecting means 52, and the flow rate control valve 48 is sequentially throttled for each signal input from the time measuring means 57. From the nozzle switch 45, the flow rate control valve 48 is opened by the flow rate, the flow rate control valve 48 is throttled by the first signal from the memory subtraction means 59, and the flow rate control valve 48 is closed by the second signal. Is reset by the signal of, the flow pulse of the pulse oscillator 44 is integrated,
The count value 58 for outputting the integrated value to the display 46 and the storage / subtraction means 59 and the signal from the preset operator 63 are stored, and the signal from the counting means is subtracted from the stored value so that the subtracted value becomes a constant value. It is composed of a memory subtraction means 59 which outputs a signal when it becomes zero and when it becomes zero.

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

Manual Liquid Supply Operation Now, the nozzle body 1 is removed from the nozzle hook 49, the drive motor 43 of the liquid supply pump 42 is started by a signal from the nozzle switch 45, and the counting means 58 of the controller 50 is operated.
Is reset and zero is displayed on the display 46, and then the cylinder tip 2
Is inserted into the liquid supply port of the tank and the lever 31 is pulled. As a result, the piston rod 24 pushed by the lever 31 moves to the right in the figure, and the valve rod 13 coupled to the rod 24 via the pin 22 that is engaged with the recess 25 of the rod 24 is also shown in the figure. The main valve 12 is moved to the right and the main valve 12 is opened, and the liquid sent from the liquid supply pump 42 is guided from the negative pressure generating portion 7 of the check valve 6 to the cylinder tip portion 2 and is then supplied into the tank. Under this condition, since the negative pressure is generated in the negative pressure generating portion 7 of the check valve 6 by the Venturi effect,
Due to this negative pressure, the inside of the air passage pipe 5 opened here is sucked with air from the opening end on the cylinder tip 2 side to be at normal pressure.

However, when the opening end on the cylinder tip 2 side is closed by the bubbles due to the rise of the liquid level in the tank, the negative pressure chamber 17 communicating with the air flow pipe 5 becomes negative pressure, and this negative pressure causes the spring to move. 18 against the 18 to suck the diaphragm 18 upward in the figure,
The piece 20 integrated with this is pulled up to remove the pin 22 from the recess 25 of the piston rod 24. As a result, even if the lever 31 is continuously pulled by the finger, the valve rod 13 released from the restraint by the rod 24 moves to the left in the figure by the biasing force of the spring 11 acting on the valve rod 13 together with the pin 22 ( In FIG. 3 (b), the main valve 2 is closed to stop the liquid supply.

Then, when the lever 31 is returned to its original position at the time when the bubbles in the tank disappear, the piston rod 24, which is urged by the spring 27 and moved leftward in the drawing together with the lever 31, is shown in FIG. Since it engages with the pin 22 in the state of returning to the position of (a), the lever 31 is pulled again and the main valve 12 is opened to keep the inside of the tank until the tip of the air flow path pipe 5 is closed by the foam. Liquid is supplied, and thereafter, this operation is repeated until liquid is supplied until the inside of the tank is full. Finally, the nozzle body 1 is hung on the nozzle hook 49, the pump motor 43 is stopped, and the liquid supply is completed.

The flow rate pulses from the pulse transmitter 44 of the flow meter 41 are integrated by the counting means 58 and displayed on the display 46.

Automatic liquid supply operation In order to perform liquid supply in this mode, the nozzle body 1 is removed from the nozzle hook 49, the display 46 is reset to zero, and the motor 4
Rotate 3. Next, when the automatic liquid supply operator 62 of the keyboard 61 provided on the measuring device 40 is pressed, the liquid supply start detecting means 51 of the control device 50 is set. Then, the lever 31 of the nozzle body 1 is pulled. When the flow rate pulse from the pulse transmitter 44 is input to the detection means 51 by this liquid supply operation,
The liquid supply stop detection means 52 is set by the signal from the detection means 51, and the signal is input to the valve control means 53, and the flow control valve 48 is fully opened by the signal from the valve control means 53.
Pressurized air from the pressurized air supply source 47 is caused to flow into the cylinder 28 provided in the barrel portion 3 to press the piston 26 in the cylinder 28 to the right in the figure, and release the pressing force to the lever 31. A liquid supply operation state of a discharge rate of, for example, 45 / min that does not require manpower is set.

On the other hand, a pulse signal is output from the pulse transmitter 44 connected to the flow meter 41 to the counting circuit 58, the number of pulses corresponding to the liquid supply amount is integrated, and the integrated content is displayed on the display 46.

When the liquid level in the tank rises and the opening at the tip of the air flow pipe 5 is closed by the bubbles, the diaphragm 18 sucked by the negative pressure in the negative pressure chamber 17 is moved to the piston rod 24 as described above. The pin 22 is disengaged from the recess 25 and the engagement with the valve rod 13 is released, and the valve rod 13 is moved to the left to close the main valve 12. In this state, the liquid supply stop detection means 52 detects the liquid supply stop, the signal from the detection means 52 sets the timing means 57, and the valve control means 53 closes the flow control valve 48. Therefore, the piston rod 24 moves to the left in the drawing together with the lever 31, and at the terminal end thereof, it is connected to the valve rod 13 again via the pin 22.

After the set time of the time measuring means 57, that is, a time of 2 to 3 seconds until the millet disappears, the valve means 5 is controlled by the time measuring means 57.
A signal is input to 3, and the valve control means 53 opens the flow rate control valve 48 in a state where the flow control valve 48 is throttled by one stage. This allows the cylinder 2
The pressurized air that has flowed into the piston 8 is moved to the piston 2 depending on the amount of the inflow.
6 is pushed to the right to open the main valve 12 through the piston rod 24, the pin 22 and the valve rod 13 by an amount corresponding to the inflow amount of the pressurized air, and from this, the tank is discharged with a discharge amount reduced to, for example, 30 / min. Supply liquid to.

By this liquid supply restart operation, a set signal is input from the liquid supply start detecting means 51 to the liquid supply stop detecting means 52. And
When the automatic valve closing mechanism 16 operates again and the liquid supply is stopped, the above operation is repeated thereafter, and the discharge rate is further increased to 20 / min.
Fill the tank by intermittently supplying the liquid while dropping it to 3 / min. Finally, when the nozzle main body 1 is hung on the nozzle hook 49, the pump motor 43 is stopped, and the liquid supply start detecting means 51 is reset to end the liquid supply operation.

Preset liquid supply operation On the other hand, when performing automatic liquid supply of, for example, 10 according to the customer's request, when the nozzle body 1 is removed from the nozzle hook 49, the indicator 46 returns to zero and the motor 43 rotates. Next, when the preset operator 63 such as the keyboard 61 provided in the weighing machine 40 is operated, 10 is set in the memory subtraction means 59 and the liquid supply start detection means 51 is set. Then, the cylinder tip portion 2 of the nozzle body 1 is inserted into the liquid supply port and the lever 31 is pulled.

By this operation, similarly to the automatic liquid supply operation, the valve control means 53 causes the flow control valve 4 to operate in response to a signal from the liquid supply start detection means 51.
8 is fully opened, pressurized air is made to flow into the cylinder 28, and the piston 26 is moved to the right. Therefore, the piston rod 24 releases the pressing force applied to the lever 31 and fully opens the main valve 12 to supply the liquid into the tank with a maximum discharge rate of, for example, 45 / min.

This liquid supply amount is counted by the counting means 58 connected to the pulse transmitter 44.
The pulse number is integrated and displayed on the display 46, while the signal from the counting means 58 enters the memory subtraction means 59 to start subtraction from the stored value. Then, when the remainder subtracted from the stored value becomes a value equivalent to 0.5, for example,
The signal from this is input to the valve control means 53, and the control means 5
The flow control valve 48 is throttled by the output of 3.

As a result, the amount of pressurized air flowing into the cylinder 28 is reduced, and the piston 26 is pushed by the spring 27 by the reduced amount to move to the left in the figure, and the piston rod 26 and the pin 2 are moved.
2. The opening of the main valve 12 is narrowed through the valve rod 13, the discharge amount from this is set to 20 / min, and the liquid supply is continued.
Then, when the subtraction value of the memory subtraction means 59 becomes zero, the valve control means 53 closes the flow control valve 48 by the signal from this and cuts off the pressurized air flowing into the cylinder 28 to shut off the main valve 12.
Close.

Finally, when the nozzle main body 1 is hung on the nozzle hook 49, the pump motor 43 is stopped, and the liquid supply start detecting means 51 is reset to end the liquid supply operation.

Although the flow control valve 48 is used to adjust the opening degree of the main valve 12 in the above, the same effect can be obtained by using the pressure control valve.

(Effect) As described above, according to the present invention, the nozzle body is provided with the piston rod for displacing the valve rod to the open position by either the pressurized air or the lever, and the valve rod is provided with the piston rod at the line opening position. Since the automatic valve closing mechanism that disengages from the rod and engages both of them at the pipe line closed position is provided, the auto nozzle itself has a normal automatic shut-off function based on the liquid level and the flow rate controlled by the control device. A control function can be added, the valve for controlling the flow rate that should be provided in the main body of the oil supply device is not needed, and the partial pressure loss is reduced, and the error of the liquid supply amount caused by the bulge of the hose is eliminated and the amount of liquid supply can be reduced. The accuracy can be further improved.

[Brief description of drawings]

1 and 2 are a side view and a top view showing a cutaway view of an auto nozzle according to an embodiment of the present invention, and FIGS. 3 (a) and 3 (b).
Is a perspective view showing the main part thereof, FIG. 4 is a schematic configuration diagram of the weighing device, and FIG. 5 is a diagram showing a control circuit. 1 ... Nozzle body, 12 ... Main valve 13 ... Valve rod, 16 ... Automatic valve closing mechanism 24 ... Piston rod 28 ... Cylinder, 31 ... Lever 33 ... Air introduction pipe, 40 ... Metering device 42 ... Liquid supply pump, 47 ... Pressurized air supply source 48 ... Flow rate control valve

Claims (1)

[Claims] 1. A valve rod is displaced to a conduit opening position by receiving the pressing force of either air from a pressurized air supply source acting on a piston fixed to a rear end portion or a lever acting on a tip end portion. A piston rod that is axially displaced as much as possible, a valve rod that is constantly urged by a spring in a direction that closes the conduit, and an air passage pipe that opens near the tip of the cylinder tip and the negative pressure generating part of the cylinder body Then, the valve rod is disengaged by the negative pressure generated in the pipe to release the engagement between the valve rod and the piston rod at the line opening position, and at the time of the return, the valve rod and the piston rod are engaged at the line closing position. An automatic nozzle with a flow control mechanism that has an automatic valve closing mechanism that enables