JPH0193671A - Two-step changeover type opening/closing valve - Google Patents

Abstract

PURPOSE:To make a valve opening a two-step changeover type at an opening/ closing valve used for a gas station oil feeder or the like by opening in a small way and engage-stopping a main valve in the middle of the valve being opened, and providing a stopper member which releases enage-stopping by the stoppage of liquid delivery. CONSTITUTION:A main valve body 2 is arranged within a valve main body having an entrance 3a and an exit 3b. A stopper member 14 for setting a small flow quantity is supported turnably by means of a shaft 16 in the lower part of the main valve 2. An obstructing plate 14 is provided on one side of the stopper member 14 and on the other side is provided a projection 14a', and energization is done by means of a spring 15 so as to be paralleled with a valve seat surface. A pump is connected at the downstream of the exit 3b. When a pilot valve 11 is opened, the main valve 2 rises and is opened fully. When the pilot valve 11 is closed, the main valve 2 comes down, and the obstructing plate 14a is operated on by means of fluid force, and with the projection 14a' facing upward, the main valve 2 stops with a small opening. When the pump is stopped, the stopper member 14 is turned by means of the spring 15, and the main valve 2 is totally closed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an opening valve that can switch the discharge amount into two stages, large and small.

(Prior art) Preset liquid supply machines used in gasoline scunds, etc., supply liquid by switching the flow rate in two stages according to the liquid supply amount, such as a large flow at the beginning and a small flow near the set amount. There is a need for a valve that can

The technology of switching the flow rate in multiple stages using valves is used as a means to shorten the cycle time of machine tools (for example, see "Hydraulic Textbook" published by Nikkan Kogyo Shimbun, pp. 102 and 103); This method requires several flow control valves in addition to a two-position switching valve, making the equipment quite complex and expensive, and it also has the problem that it cannot be applied to systems that supply large amounts of liquid. are doing.

(Purpose) The present invention has been made in view of the above problems, and its purpose is to provide a device with a simple structure that can switch and control a single valve into two stages of large flow rate and small flow rate. Our goal is to provide the following.

(Summary of the Invention) In other words, the present invention is characterized by providing a stopper member that locks the main valve to a small opening while the valve is closing, and releases the locking when liquid feeding is stopped. is set by the stopper member.

(Example) The details of the present invention will be described below based on illustrated examples.

The drawing shows one embodiment of the present invention, and the reference numeral 2 in the drawing is the main valve of the two-stage switching type on-off valve 1 provided in the middle of the liquid supply pipe 3. It is constructed so that it is always seated on the valve seat 8 under the static pressure that acts on the hydraulic pressure chamber 7 on the back side through the spring 5 provided between the back side and the lid 4 and the communication hole 6 .

On the other hand, the cylinder 9 into which the main valve 2 is slidably inserted has a drain hole 1 which communicates with the downstream side of the liquid supply pipe 3 via a pilot valve 12 consisting of a solenoid 10 and a valve body 11.
3 is provided. The liquid drain hole 13 is configured to discharge more liquid than the amount of liquid flowing into the hydraulic pressure chamber 7 from the communication hole 6 when the pilot valve is opened by 12%.

14 is a stopper member for setting a small flow rate, and a baffle plate 14a that receives the dynamic pressure of the fluid from the inflow port is provided on one side of the rotating shaft.
The other side is provided with a protrusion 14b having a length to form a gap corresponding to a small flow rate, and is rotated by a shaft 16 below the valve seat surface while being biased by a spring 15 so as to be parallel to the valve seat surface. possible to be pivoted. In addition, the reference numeral 2o in the figure indicates a protrusion that comes into contact with the upper end of the main valve and limits the upper limit m.
1 shows the gasket provided at the tip of the main valve.

Next, the opening/closing operation of the valve thus configured will be explained.

When the pilot valve 12 is opened while the liquid is being fed by the pump, the liquid in the hydraulic chamber 7 flows out to the outlet side through the pilot valve 12 and the drain hole 13@, and resists the spring 5 due to the hydraulic pressure. to move the main valve 2 upward. As a result, fluid flows toward the outflow port, and at the same time, the baffle plate 14a of the stopper member 14 receives the dynamic pressure of the fluid flowing from the inflow port, and rotates against the spring 15 until it is perpendicular to the valve seat surface. (Figure 3 I).

In this state, if you want to reduce the flow rate, use solenoid 10.
When the pilot valve 12 is closed by deenergizing the drain hole 13
is closed, the static pressure of the fluid flowing in from the communication hole 6 acts on the back surface of the main valve 2, and combined with the force of the spring 5, moves the main valve 2 excessively toward the valve seat 8. The receiver receives the dynamic pressure flowing from the stopper member 14 and stops when it comes into contact with the protrusion 14b of the stopper member 14 in the vertical position. As a result, the protrusion 14b
Liquid is supplied at a small flow rate with the opening determined by the length of (■).

When stopping the liquid supply, the nozzle valve (not shown) is closed or the operation of the pump is stopped to stop the movement of the fluid in the liquid supply pipe, so that the dynamic pressure on the stopper member 14 is no longer applied, and the spring 15 is Since the turning force prevails and the force of the spring 5 acting on the main valve 2 is received, the stopper member 14 returns to a direction parallel to the valve seat surface. As a result, the main valve 2 is pressed against the valve seat 8 by the spring 5, thereby closing the flow path.

FIG. 4 shows an example of a liquid supply device 130 using the above-described two-stage switching valve 1. A liquid supply pump 32 driven by a pump motor 31 pumps liquid stored in an underground tank or the like. It is configured to send liquid to the liquid supply nozzle N via the flow meter 33 and the main valve 2 of the above-described two-stage switching type on-off well 1,
The control device 40 also receives a pulse signal from a flow rate pulse transmitter 34 connected to a flow meter 33, a signal corresponding to the amount of liquid supplied by a preset button 35 on a keyboard 38, a start button 36, and a reset button 37. The signal outputted from the control device flt40 is input to a display 39 for displaying the preset amount and the amount of liquid to be supplied, a pilot valve 12 of the two-stage switching valve 1, etc.

Figure 5 shows the control device 40t! The control device 140 is reset by a signal from the reset button 37, integrates the flow pulse from the flow pulse transmitter 34, and outputs this to the display 39 via the display meter driving means 42. , and a counting means 41 that outputs the amount of liquid to be supplied to the comparison means 43, and an integrated value signal from the counting means 41 and the amount of liquid to be supplied setting means 44.
It receives and compares the preset set value signal from the controller, and outputs a throttle signal to the pilot valve drive means 47 when the amount of liquid supplied reaches just before the set value, and outputs a stop signal to the motor control means 46 when it becomes zero. Comparing means 43, liquid supply amount setting means 44 which is reset by a signal from reset button 36, receives a preset signal from preset button 35 and outputs it as a set value to comparison means 43, and start button 36.
a pilot valve drive means 47 which opens the pilot valve in response to a signal from the control circuit and closes the pilot valve in response to a throttle signal; and a motor control means which controls the pump drive motor 31 in response to a signal from the start button 36 and a stop signal from the comparison means 43. 46.

In the liquid supply device configured as described above, for example, in order to fill the tank with gasoline, the reset button 37 is pressed to reset the counting means 41 and the liquid supply amount setting means 44, and then the preset button 35 is used to start the liquid supply. The amount is input into the liquid supply amount setting means 44. When the start button 36 is pressed at this stage, a signal is output from the bidet valve drive means 47 and the pilot valve 12 opens, which causes the main valve 2 to fully open.
Liquid supply is started with a discharge rate of 45 fl per minute, and in conjunction with this, the liquid supply rate is displayed on the display meter 39 by a pulse signal from the flow rate pulse generator 34.

This supplied liquid amount signal is input to the comparison means 43, where it is compared with the set value from the supplied liquid amount setting means 44. When the difference between these pockets reaches a value corresponding to, for example, 0.51, the throttle signal from the comparing means 43 is input to the pilot valve driving means 47, and the solenoid 10F of the pilot valve 12 is inputted to the pilot valve driving means 47.
8. Close the main valve 1 and lower it to the position where it contacts the protrusion 14b (Fig. 3 -).

As a result, the discharge amount from the liquid supply nozzle N is 10β/min.
However, the liquid supply continues to be performed, and when the value of the comparison means 43 becomes zero, the comparison means 43 outputs a signal to the motor control means 46 to stop the liquid supply, so that the stop member 14 becomes horizontal. direction to close the main valve 1 and finish the liquid supply.

In this embodiment, the pump 32 is stopped and the main valve is closed, but even if the nozzle valve is closed, no dynamic pressure is applied, so it is possible to set the nozzle to the full state.

Further, in the above-described embodiment, the communication hole is provided in the casing, but the same effect can be achieved even if the communication hole 22 is provided on the inlet side of the main valve 1 as shown in FIG. is clear.

(Effects) As described above, according to the present invention, a stopper that rotates in response to dynamic pressure is provided at a position opposite to the valve seat of the valve body that is opened and closed by the pilot valve, so that the valve body can be opened and closed by fluid pressure. At the same time, the stopper can be used to set the opening for small flow rates, and a single pilot valve can be used to perform two-stage flow rate switching between large flow rate and small flow rate using a single valve body installed in the liquid supply flow path. This method can be applied to equipment requiring this type of flow rate adjustment, thereby significantly simplifying the piping system and significantly reducing equipment costs.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a two-stage switching type switching well that constitutes an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, and Fig. 3 I and ■ show the operation of the same device. 4 is a diagram showing an example of a liquid supply device using the above valve, FIG. 5 is a diagram showing its control circuit, and FIG. 6 is a sectional view showing another embodiment of the present invention. be.

Claims (1)

[Claims] A two-stage switching type on-off valve that is equipped with a stopper member that locks the main valve to a small opening while the valve is closing, and releases the lock when liquid feeding is stopped.