JPH0814331B2 - 2-stage switching type on-off valve - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an on-off valve capable of switching the discharge amount between two stages, large and small.

(Prior Art) In a preset liquid dispenser used at a gas station or the like,
There is a demand for a valve that can supply liquid by switching the flow rate between two stages according to the liquid supply amount, such as the first large flow liquid supply and the small flow liquid close to the set amount.

Such a technique of switching the flow rate in multiple stages by a valve is used in a machine tool such as a cycle time shortening device (for example, "Hydraulic textbook" issued by Nikkan Kogyo Shimbun).
(See pages 102 and 103). These require some flow control valves in addition to the two-position switching valve, which makes the equipment considerably complicated and expensive, and it is necessary to supply a large amount of liquid. It has a problem that it cannot be applied to various things.

(Purpose) The present invention has been made in view of such a problem, and an object thereof is to provide a single valve with a large flow rate and a small flow rate.
An object of the present invention is to provide a device having a simple structure capable of switching control in stages.

(Summary of the Invention) That is, the feature of the present invention is that the main valve is opened and closed while the valve is closed, and a stopper member that is unlocked by stopping the liquid supply is provided to open a small flow rate. Is set by the stopper member.

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

The drawings show one embodiment of the present invention, in which reference numeral 2 is a main valve of a two-stage switching type on-off valve 1 provided in the middle of a liquid supply pipe 3, and this main valve 2 has a rear surface thereof. A spring 5 provided between the lid 4 and the lid 4 and a static pressure acting on the rear hydraulic chamber 7 through the communication hole 6 are constantly seated on the valve seat 8.

On the other hand, a cylinder 9 in which the main valve 2 is slidably inserted has a pilot valve composed of a solenoid 10 and a valve body 11.
A drainage passage hole 13 communicating with the downstream side of the liquid supply pipe 3 via 12 is provided. The drainage passage 13 is configured to discharge a larger amount of fluid than the fluid flowing into the fluid pressure chamber 7 from the communication hole 6 when the pilot valve 12 is opened.

Reference numeral 14 is a stopper member for setting a small flow rate, and one of the rotating shafts has a baffle plate 14a that receives the dynamic pressure of the fluid from the inflow port, and the other has a protrusion having a length that forms a gap corresponding to the small flow rate. 14b is provided and is rotatably supported 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. In the figure, reference numeral 20 indicates a protrusion that abuts on the upper end of the main valve to limit the upper limit position, and 21 indicates a packing provided at the tip of the main valve.

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

When the pilot valve 12 is opened while the liquid is being sent by the pump, the liquid in the hydraulic chamber 7 flows out to the outlet side through the pilot valve 12 and the drainage passage hole 13, and the liquid pressure causes the spring 5 to resist the spring 5. Then, the main valve 2 is moved upward. As a result, the fluid flows into the outlet side. At the same time, the baffle plate of the stopper member 14
The spring 14a receives the dynamic pressure of the fluid flowing in from the inlet 15
It is rotated to a state in which it is perpendicular to the valve seat surface (FIG. 3I).

If you want to reduce the flow rate in this state, the solenoid 10
When the pilot valve 12 is closed by deenergizing the valve, the drainage passage hole 13 is closed, so that the static pressure of the fluid flowing from the communication hole 6 acts on the back surface of the main valve 2 together with the force of the spring 5. The valve 2 is moved toward the valve seat 8 side, but the protrusion 14b of the stopper member 14 in the vertical state is received by the dynamic pressure flowing from the inflow port.
Abut and stop. As a result, the liquid is supplied at a small flow rate with the opening defined by the length of the protrusion 14b (II).

When stopping the liquid supply, a nozzle valve (not shown) is closed, and when the pump operation is stopped to stop the movement of the fluid in the liquid supply pipe, the dynamic pressure on the stopper member 14 stops acting and the spring 15 Since the turning force is superior and the force of the spring 5 acting on the main valve 2 is received, the stopper member
14 returns in 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 to close the flow passage.

FIG. 4 shows an example of the liquid supply device 30 using the two-stage switching type on-off valve 1 described above. The liquid supply pump 32 driven by the pump motor 31 is configured to supply the liquid stored in an underground tank or the like. The flow meter 33 and the main valve 2 of the two-stage switching type on-off valve 1 described above are configured to deliver liquid to the liquid supply nozzle N, and the control device 40 is connected to the flow meter 33 with a flow rate pulse transmitter. The pulse signal from 34, the signal corresponding to the liquid supply amount set by the preset button 35 on the keyboard 38, the signal from the start button 36 and the reset button 37 are input, and the signal output from the control device 40 is the preset amount. And indicator 3 that displays the liquid supply
9, It is configured to input to the pilot valve 12 of the two-stage switching type on-off valve 1.

FIG. 5 shows the control device 40.
Is reset by a signal from the reset button 37, integrates the flow rate pulse from the flow rate pulse transmitter 34, outputs this to the display 39 via the indicator drive means 42, and the comparing means.
The counting means 41 that outputs the liquid supply amount to 43, and the integrated value signal from the counting means 41 and the preset set value signal from the liquid supply amount setting means 44 are received and compared, and the liquid supply amount reaches immediately before the set value. Comparing means for outputting a throttle signal to the pilot valve drive means 47 when it does, and a stop signal to the motor control means 46 when it becomes zero
43, a liquid supply amount setting means 44 which is reset by a signal from the reset button 36, receives a preset signal from the preset button 35 and outputs it as a set value to the comparison means 43, and a signal from the start button 36 It is composed of pilot valve drive means 47 for opening the valve and closing the pilot valve by a throttle signal, a signal from the start button 36, and a motor control means 46 for controlling the pump drive motor 31 by a stop signal from the comparison means 43. ing.

In the liquid supply device configured in this way, 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 liquid is supplied by the preset button 35. The amount is input to the liquid supply amount setting means 44. If the start button 36 is pressed at this stage, a signal is output from the pilot valve drive means 47 and the pilot valve
12 open. As a result, the main valve 2 is fully opened, and the liquid supply is started with the discharge amount of 45 per minute, and the liquid supply amount is displayed on the display 39 by the pulse signal from the flow rate pulse transmitter 34. This liquid supply amount signal is input to the comparison means 43, where it is compared with the set value from the liquid supply amount setting means 44. When the difference between these values reaches a value corresponding to 0.5, for example, the throttle signal from the comparison means 43 is input to the pilot valve drive means 47, the solenoid 10 of the pilot valve 12 is closed, and the main valve 1 is applied to the projection 14b. Lower it to the contact position (Fig. 3, II).

As a result, the discharge rate from the liquid supply nozzle N is reduced to 10 / min, but the liquid supply continues, and the comparison means
When the value of 43 becomes zero, the comparison means 43 outputs a signal to the motor control means 46 to stop the liquid feeding, so that the stop member 14
Rotates in the 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. However, even if the nozzle valve is closed, the dynamic pressure does not act, so that the fully closed state can be achieved.

Further, although the casing is provided with the communication hole in the above-mentioned embodiment, the same effect can be obtained even if the communication hole 22 is provided on the inlet side of the main valve 1 as shown in FIG. Is clear.

(Effect) As described above, according to the present invention, since the stopper which rotates by receiving the dynamic pressure is provided at the valve seat facing position of the valve body which is opened and closed by the pilot valve, the valve body is opened and closed by the fluid pressure. In addition, the opening for a small flow rate can be set by the stopper, and a single valve body provided in the liquid supply passage can be switched between a large flow rate and a small flow rate by one pilot valve. It is possible to apply this kind of device to a device requiring flow rate adjustment to remarkably simplify the piping system and to significantly reduce the equipment cost.

[Brief description of drawings]

FIG. 1 is a sectional view of a two-stage switching type on-off valve which constitutes an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIGS. FIG. 4 is a diagram showing an example of a liquid supply device using the valve, FIG. 5 is a diagram showing a control circuit thereof, and FIG. 6 is a sectional view showing another embodiment of the present invention. is there. 2 ... Main valve, 3 ... Liquid supply pipe 6 ... Communication hole, 12 ... Pilot valve 13 ... Drainage hole, 14 ... Stopper member 14a ... Baffle plate, 14b ... Protrusion

Claims (1)

[Claims] 1. A two-stage switching type on-off valve in which a main valve is held in a small open state while the valve is being closed, and a stopper member is provided which can be unlocked by stopping liquid supply.