JPH0776038B2 - Liquid supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a liquid supply device, in particular, a nozzle that automatically closes by a negative pressure generated by a flow at the time of liquid detection and automatically opens by rising after a decrease in liquid pressure. The present invention relates to a liquid supply device using.

(Prior Art) A nozzle that performs a valve closing operation when a liquid is detected by using a negative pressure generated by a flow of a liquid supplied to a tank, and also performs a valve opening operation by increasing the liquid pressure after a decrease in the liquid pressure, a so-called auto nozzle is It is disclosed in JP-A-63-125196.

That is, as shown in FIG. 5, an air inlet tube C having one end having an opening B near the tip of the barrel tip portion A is inserted in the barrel tip portion A, and the other end is provided in the barrel body portion D. Valve E
The negative pressure generating part F and the negative pressure chamber H of the automatic valve closing mechanism G are opened. A hose connected to a pump of a weighing device is coupled to the side surface of the barrel portion D, and the passage extending from here to the tip of the barrel is always closed by a spring K through a valve punch J. A biased main valve L is provided, and a check valve E forming a negative pressure generating portion of an air inflow pipe C is provided downstream of the main valve L.
Are opposed to each other. On the side surface of the barrel body D, the diaphragm M is deformed by the negative pressure generated in the negative pressure chamber H,
A recess of the push rod R slid by the lever N,
Remove the pin Q that is locked in the recess P of the valve punch J to remove the main valve L
A valve closing mechanism G for closing the valve is provided, and a valve seat T of the main valve L is provided slidably by a spring V.
In the figure, reference symbol S indicates a latch for holding the lever N in the pulled state.

In such a nozzle, a negative pressure is generated by the flow in the flow path formed by the check valve that is pushed open by the liquid pressure. Since the negative pressure generated in the pressure generating portion F becomes too large, the diaphragm M is deformed, the pin Q is disengaged, the valve Q is closed again immediately after the valve is opened, and the valve seat T is moved impulsively. There is an inconvenience that the parts constituting the automatic valve closing mechanism G are easily worn.

(Means for Solving the Problem) In order to solve such a problem, in the present invention, a small amount of the liquid is discharged at the initial stage of the liquid feeding as compared with the normal liquid feeding.

(Function) At the start of liquid transfer, the amount of liquid supplied is small,
The negative pressure generated in the negative pressure generation section is reduced to prevent malfunction, and the pressure acting on the main valve is suppressed to a low level, thereby alleviating the impact force at the start of liquid supply.

(Example) Therefore, the details of the present invention will be described below based on an illustrated example.

FIG. 1 shows an embodiment of the present invention. In the figure, reference numeral 1 is a flow meter that receives liquid supply from a liquid feed pump 3 driven by a pump motor 2 and has a discharge port A pulse transmitter 6 that is connected to one end of a liquid supply hose 5 via a flow rate control valve 4 described later and that outputs a pulse proportional to the flow rate is provided. To the other end of the liquid supply hose 5, a nozzle 10 (FIG. 5) that performs a valve closing operation by utilizing the negative pressure generated by the above-described liquid flow is connected.

FIG. 2 shows an embodiment of the above-mentioned flow control valve. In the figure, reference numeral 20 is a main valve as a flow control valve disposed in a part of the liquid feeding pipe. 20 is a valve seat hole described later
A plurality of step portions 20a, 20b having a step length and having a diameter of which the tip side becomes gradually smaller are formed on the surface facing the 21a, and a spring provided between the back surface and the lid 22.
The valve seat 21 is always seated by receiving the pressing force of 23 and the static pressure on the upstream side of the pipeline acting on the hydraulic chamber 25 on the back surface via the liquid passage hole 24, which will be described later.

On the other hand, a valve body 26 slidably inserted through the main valve 20 is provided with a liquid conducting hole 24 communicating with the upstream side of the liquid supply pipe and a draining liquid hole 27 communicating with the downstream side of the liquid supply pipe. The through holes 24, 27 are provided with a first solenoid valve 28 and a second solenoid valve 29 for driving the valve bodies 28b, 29b by energizing the solenoids 28a, 29a to open the through holes 24, 27. Has been. Reference numeral 30 in the figure is a side road,
The main valve (20) is provided with a through hole in the wall portion (31) separating the inflow side and the outflow side, and the fluid resistance thereof is set to a desired minimum flow rate. Note that reference numerals 33 and 34 in the figure respectively indicate flow rate adjusting screw valves provided in the liquid introducing hole 24 and the draining hole 27, respectively.

Returning to FIG. 1 again, reference numeral 11 in the drawing denotes a control device, which receives signals from the flow rate pulse transmitter 1 and the nozzle switch 12, and also displays 13, the flow rate control valve 4, and the pump motor 2.
Is configured to be controlled based on a flowchart described later.

Next, the operation of the apparatus thus configured will be described based on the flowcharts and waveform charts shown in FIGS.

When the nozzle 10 is removed from the nozzle hook to start the liquid supply, the nozzle switch 12 is turned on (Fig. 3A), and the control device 11
Operate pump motor 2 (Fig. 4) and display 13
To zero (b). In this state, the flow control valve 4
Since the main valve 20 is closed, the liquid sent from the pump 3 flows into the hose 5 via the side passage 30 of the flow control valve 4 and then into the liquid supply nozzle 10. Therefore, the valve seat T, which is urged by the spring U and occupies the forward position, receives the hydraulic pressure from the liquid supply pump 3 and slowly retracts while the main valve L is in contact.

In this state, when the lever is pulled and the latch S is locked at that position, the push rod R pushed by the lever N pulls the integral valve rod J back through the pin Q to the right in the drawing to pull out the main valve. L
open(). As a result, liquid is supplied through the side passage 30 of the flow control valve 4 at a small flow rate of, for example, 5 liters per minute. In this state, a constant flow rate, for example, 0.10 liter of liquid is supplied (C). The second solenoid 29a of the flow control valve 4 is urged (and d) to open the drainage hole 27 to fully open the main valve 20, for example, normal liquid supply is started at a maximum flow rate of 45 liters per minute. The pulses output from the flow rate pulse transmitter 6 in accordance with this are integrated by the sequential counting means and displayed on the display 13 as the liquid supply amount. When a fixed amount, for example, 10 liters of liquid has been supplied from the start of the liquid supply (f), the second solenoid 29a is deenergized and the second solenoid valve 29 is closed.
8 solenoid 28a is energized for a short time ΔT, for example 0.15
The first solenoid valve 28 is opened () and closed (g,) for about a second. As a result, the amount of fluid in the liquid chamber 25 is increased by a small amount, the main valve 20 moves to the valve seat 21 side, and the step portion 20
The flow rate will be limited by the difference in diameter between b and the valve seat hole 21a. By this flow rate throttling operation, the discharge amount of the liquid from the nozzle 10 is set to, for example, a flow amount of about 35 liters per minute, which is less than about 10 liters per minute as compared with the normal liquid supply, and blowback from the tank is prevented. become. If the liquid rises to the detection opening B of the nozzle and the main valve L is closed and the liquid supply is stopped before this flow rate throttling operation (h), the process moves to step (n) described later.

When the liquid supply at this flow rate progresses and the bubbles in the tank rise to the liquid detection opening B of the nozzle, the negative pressure generated by the negative pressure generation mechanism F acts on the negative pressure chamber H, and the diaphragm M moves. After being sucked, the pin Q is disengaged from the recess P of the push rod R, and the valve rod J is pushed by the spring K to bring the main valve L into contact with the valve seat T and close the main valve. (). The control device 11 detects the change in the flow rate, (i) stops the pump motor 2, and energizes the first and second solenoid valves 28, 29 of the flow rate control valve 4 to open the through holes 24, 27. Open (, nu). As a result, the main valve 20 of the flow control valve 4 is urged by the spring 23 to come into contact with the valve seat 21 and close the flow path. Then, the hydraulic pressure in the hose S disappears, the valve seat T and the valve stick J are pushed forward by the spring U, and when the concave part of the valve stick J and the concave part of the push rod R coincide with each other, the pin Q separates them. Integral, the main valve L is locked in this position.

After a time for which the bubbles disappear, for example, at a stage of about 4 seconds (L), the controller 11 operates the pump motor 2 again (E). The liquid sent from the pump 3 flows into the nozzle 10 with a small flow rate through the side passage 30 of the flow rate control valve 4 and exerts hydraulic pressure on the valve seat T of the nozzle to open it against the spring U. . When a predetermined amount, for example, about 100 cc of liquid has flowed, the control device 11 causes the solenoid of the second solenoid valve 29 to
29a is urged for a minute time ΔT, for example, about 0.35 seconds (
). Thus, the flow rate determined by the difference in diameter between the step portion 20a and the valve seat hole 21a, that is, the negative pressure generated in the negative pressure generating portion F is sufficient to operate the automatic valve closing mechanism G, for example, about 20 liters per minute. Becomes By this liquid supply operation, the bubbles rise up to the liquid detection opening B mechanism, and when the automatic valve closing mechanism F operates to stop the liquid supply operation (Yo), the process returns to step (n) described above, and again (n ) ~ (Yo) repeat the process. By repeating the liquid supply with this medium flow rate, it is possible to reliably perform the oil supply to the specified position even when the disappearance of the bubbles is insufficient.

When the medium flow rate liquid supply is repeated a plurality of times, for example, twice (ta), the pump motor is stopped and the first and second solenoids 29a and 29a are energized (re), and the bubble disappearance time is reached. After that, the control device 11 determines that the lower digit of the liquid supply amount calculation, for example, 10
A value where the effective number is zero up to CC, that is, a so-called rounding amount is preset, the first and second solenoids 28a and 29b are deenergized, the pump motor 2 is operated again, and the flow path control valve 4 is bypassed from the side passage 30. Perform liquid supply at the flow rate. (Tsu). In this way
At the stage where the liquid has been supplied up to the preset rounding amount (n), the pump is stopped (n), and the lever N is engaged with the latch S.
If the nozzle is removed and the nozzle 10 is set on the nozzle hook, the nozzle switch 12 is turned off (La,).

In addition, in this embodiment, the liquid supply operation at the intermediate flow rate is performed twice, but it is clear that the same operation can be achieved even if it is performed three times or more.

Further, in this embodiment, the liquid feed is started and stopped by the pump motor, but a similar function can be obtained by providing a stop valve in the liquid feed passage to start and stop the liquid feed. It is clear that it will play.

Further, in the above-mentioned embodiment, the minimum flow rate is set by providing the flow control valve with the side passage, but it is clear that the same effect can be obtained even if the flow rate control valve is set by the opening degree of the main valve.

(Effects of the Invention) As described above, in the present invention, when the liquid at the tip of the nozzle or the bubble is detected, the valve closing operation is performed by increasing the negative pressure generated in the negative pressure generating portion of the nozzle body due to the flow of the liquid. In addition, in the liquid supply device equipped with a liquid supply nozzle that can be opened by stopping the liquid supply after closing the valve and starts opening after a certain period of time to restart the liquid supply, At the start, the negative pressure generated in the negative pressure generating section is lower than the negative pressure that induces the valve closing operation.Lubrication is executed at a small flow rate, and after a predetermined amount of liquid has been supplied, the liquid supply at a small flow rate is not interrupted. Since it is equipped with a flow rate control means for continuously supplying the liquid at the flow rate of the normal liquid supply capable of closing the valve, a gentle fluid pressure can be applied to the main valve of the liquid supply nozzle even when the liquid supply is started. If it is possible to maintain the valve open state and guarantee a reliable lubrication operation, In addition, the life of the main valve can be extended by eliminating the sudden movement of the main valve.

[Brief description of drawings]

FIG. 1 is a block diagram of an apparatus showing an embodiment of the present invention, FIG. 2 is a sectional view showing an embodiment of a flow control valve used in the same apparatus, and FIGS. 5A and 5B, and FIG. 5A and FIG. 5B are cross-sectional views showing an example of a nozzle that is closed by a negative pressure generated by each fluid. 1 ... Liquid feed pump, 2 ... Pump motor 3 ... Flow meter, 4 ... Flow control valve 6 ... Flow pulse transmitter

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Haruhisa Yamada 2-12-13 Shibaura, Minato-ku, Tokyo Tokyo Tatsuno Co., Ltd. (56) Reference JP-A 1-279096 (JP, A) JP-A 63 -125196 (JP, A) JP-A-56-84296 (JP, A)

Claims (1)

[Claims] 1. When a liquid at the tip of a nozzle or bubbles is detected, the valve closing operation is performed by increasing the negative pressure generated in the negative pressure generating portion of the nozzle body due to the flow of the liquid, and the liquid feeding is stopped after the valve is closed. In the liquid supply device provided with a liquid supply nozzle that opens by the start of liquid supply after a certain time and restarts liquid supply, when the liquid supply nozzle starts the liquid supply, the negative pressure generation unit The generated negative pressure causes the refueling to be executed at a small flow rate that is lower than the negative pressure inducing the valve closing operation, and after the predetermined amount of liquid has been supplied, the valve closing operation is continued without interruption of the liquid supply at the small flow rate. A liquid supply device comprising flow rate control means for performing liquid supply at a possible normal liquid supply flow rate.