JPH0193686A - Flow control valve - Google Patents

Abstract

PURPOSE:To switch the discharge quantity from high flow to low flow by means of a single valve disc by installing valves capable of independently opening and closing each hole to a liquid-introducing hole and a liquid-exhausting hole connected to the upstream and downstream sides of a supplying pipe line. CONSTITUTION:When a second solenoid operated valve 17 is energized, the solenoid operated valve 17 opens a liquid-exhausting hole 15, a liquid in a liquid pressure chamber 7 flows to the downstream side of a supplying pipe 3, with the result that a main valve 2 moves up by liquid pressure from the upstream side to fully open the pipe line. In order to contract the opening from the full opening state, a first solenoid operated valve 13 is energized to open a liquid- introducing hole 11 and connect the upstream side to the liquid pressure chamber 7, and at the same time, the second solenoid operated valve 17 is de-energized to close the liquid-exhausting hole 15 and disconnect the hole from the downstream side. When the discharge quantity reaches a desired value, the first solenoid operated valve 13 is de-energized to close the liquid-introducing hole 11.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a flow control valve capable of switching the discharge l.

(Prior art) Preset liquid dispensers used at gas stations, etc. require a valve that can switch the flow rate depending on the liquid supply, such as supplying a large flow at the beginning and supplying a small flow near the set amount. ing.

The technology of switching the flow rate using a valve is used as a means to shorten the cycle time of machine tools (for example, see "Hydraulic Textbook" 10, published by Nikkan Kogyo Shimbun).
(See page 2.103), these require several flow rate control valves in addition to the 3-position switching valve, making the equipment quite complex and expensive, and in addition to requiring a large amount of liquid to be supplied. The problem is that it cannot be applied to objects.

(Purpose) The present invention was made in view of these problems, and its purpose is to provide flow rate control with a simple structure that allows switching the discharge amount from a large flow rate to a small flow rate using a single valve body. The purpose is to provide a valve.

(Means for Achieving the Object) That is, the present invention provides a flow rate control valve for achieving the above object, which includes a liquid introducing passageway that communicates with the upstream side and the downstream side of the liquid supply pipe in the liquid chamber on the back of the valve body. In addition to providing holes and drainage holes,
Each through hole r! : A valve that can be opened and closed is provided, and by operating this valve, the pressure inside the liquid chamber can be changed and the degree of opening of the valve body can be changed.

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

FIG. 1 shows an embodiment of the present invention, and the reference numeral 2 in the figure is a main valve as a flow control valve 1 disposed in a part of a liquid supply pipe 3. , the valve seat is constantly closed by the pressing force of the spring 5 provided between the back surface and the lid 4, and the static pressure on the upstream side of the pipe acting on the hydraulic pressure chamber 7 on the back surface through the liquid guide hole 11. It is configured to seat 8.

On the other hand, on the side of the valve body 10 through which the main valve 2 is slidably inserted, there is a liquid guide hole 11 that communicates with the upstream side of the liquid supply pipe 3 and a drainage hole that communicates with the downstream side of the liquid supply pipe 3. 15, and each through hole 11.15 is provided with a first solenoid valve 13 and a second solenoid valve 17 for opening and closing each through hole 11.15.

In addition, the reference numeral 6 in the figure indicates a backing provided on the main valve 2, and 14.
Reference numeral 18 indicates screw valves for flow rate adjustment provided in the liquid guide hole 11 and the drain liquid hole 15, respectively.

Next, the opening/closing operation of the flow rate control valve 1 configured as described above will be explained with reference to FIGS. 1 and 2.

The first and second solenoid valves 13 and 17 close the liquid guide hole 11 and the drain hole 15, respectively, and the main valve 2 contacts the valve seat 8 and closes the liquid supply pipe 3. Under the condition shown in FIG. 1, the liquid supply pump (not shown) is operated, and then the second solenoid valve 17 is
When energized, the electromagnetic valve 17 opens the drain hole 15 and brings the hydraulic pressure chamber 7 on the back side of the main valve 2 and the downstream side of the liquid supply pipe 3 into communication. Therefore, the liquid in the hydraulic pressure chamber 7 flows out to the downstream side of the liquid supply pipe 3, and the main valve 2 rises in response to the pressure of the liquid on the upstream side, fully opening the pipe (the first Figure 2 (a)).

2 abc To narrow down the opening from the fully open state described above, first solenoid valve 13
is energized, the liquid guide hole 11 is opened, and the upstream side of the liquid supply pipe 3 and the hydraulic pressure chamber 7 are brought into communication. As a result, the main valve 2 starts to descend due to the pressure increase in the hydraulic chamber 7 (Fig. 2(b)).
When the degree of opening, in other words, the discharge amount from the liquid supply pipe 1 reaches a desired value, at that point, the first electromagnetic valve 13 is turned off and the liquid guide hole 11 is closed. As a result, the main valve 2 is kept in a throttled state by the pressure in the hydraulic chamber 7 at the time when the liquid introduction hole 11 is closed (FIG. 2(C)).

In order to further reduce the discharge amount from this reduced state, the first solenoid valve 13 is energized again to open the liquid guide hole 11. As a result, the hydraulic pressure in the hydraulic chamber 7 increases and the main valve 2 is further activated. Since the main valve 2 can be lowered, the opening degree of the main valve 2 can be gradually reduced by repeating the same operation as the previous time.

Next, in order to open the main valve 2 from the throttled state shown in FIG. (Figure 2(a)
), when the desired opening degree is reached, the second electromagnetic valve 17 may be deenergized to close the drain hole 15 (FIG. 2(c)).

Finally, to close the main valve 2, the solenoid valve 13 is energized and the liquid guide hole 11 is left open. It descends until it makes contact and closes the pipe.

By the way, FIG. 3 shows an example of a metering device using the above-mentioned flow rate control valve 1, and the above-mentioned flow rate control valve is installed from the upstream side of the liquid supply pipe 3 leading from the liquid supply pump (not shown) to the nozzle. A valve 1 and a flow meter 20 are arranged in order, and a control bag N
30, a flow I pulse transmitter 21 connected to the flow meter 20;
, a signal corresponding to the liquid supply amount set by the preset button 23 on the keyboard 22, and signals from the start button 24 and reset button 25 are input, and the signal output from the control device 30 is input. , the above-mentioned first and second
It is configured to output to the electromagnetic valves 13, 17 and a display 26 that displays the flow rate and preset amount.

FIG. 4 shows the above-mentioned control device 130. This control device 3o measures the instantaneous flow rate at each moment based on the pulse signal from the flow rate pulse generator 21 and sends it to the valve control means 36. An instantaneous flow rate measuring means 31 that outputs, a counting means 32 that is reset by the reset button 25, integrates the pulses from the flow rate pulse generator 21 and outputs it to the display drive means 33, and is reset by the reset button 25, A setting means 35 receives a preset signal from the preset button 23 and outputs the preset signal as a set value to the comparison means 34 and the display driving means 33, and the integrated value signal from the counting means 32 and the set value signal from the setting means 35 Comparing means 34 outputs the difference between the set value and the integrated value to the storage means 37 and also outputs it to the valve control means 36 together with the data corresponding to the flow rate curve (FIG. 5) stored in the storage means 37.
Then, the start button 24 is activated to open the second electromagnetic valve 17, and from then on, the first, The valve control means 36 operates the second solenoid valves 13 and 17 at the timing shown in FIG.

Then, in order to fill gasoline into the fuel tank of a car, for example, using the liquid supply device configured in this way, the reset button 25 is pressed to reset the counting means 32 and the setting means 35, and the preset button 23 is operated to perform, for example, 30J
When the liquid supply amount Qt is set and the start button 24 is pressed, the liquid supply pump (not shown) is activated and the second solenoid valve 17 opens the liquid drain hole 15 (FIG. 5I).

Therefore, in this state, if a liquid supply nozzle (not shown) is inserted into the liquid supply port of the tank and the lever is pulled, the main valve 2 will open due to the hydraulic pressure, and the normal liquid supply will be performed with a discharge rate q1 of, for example, 45j2 per minute. (Fig. 5 ■), and the pulses output from the flow rate pulse generator 21 are sequentially counted by the counting means 3.
2 and displayed as the amount of liquid supplied on the display 26, this integrated value signal is input to the comparison means 34, and compared with the set value signal from the setting means 35 input here, the remaining amount is calculated. is calculated.

In this way, when the remaining amount calculated by the comparison means 37 eventually reaches 1ρ, the output signal from this and the program signal from the storage means 37 cause the valve control means 36 to open the first electromagnetic valve 13 and to open the first electromagnetic valve 13. 2 closes the electromagnetic valve 17 and causes the main valve 1 to perform a closing operation (Fig. 5 III), and when the discharge amount q2 becomes, for example, 20 u/min due to this closing operation, the moment this state is detected from the change in the pulse signal. The flow rate measurement means 31 immediately outputs this detection signal to the valve control means 36 and energizes the first electromagnetic valve 13 to stop the main valve 2 at the first stage throttle level (Fig. 5 -).

In addition, if excessive aperture occurs during this operation, the second
Open the solenoid valve, open the main valve 2 a little (V in Figure 5), and close it again (■ in Figure 5).

When this small amount of liquid supply progresses and the remaining amount calculated by the comparing means 37 reaches, for example, 0.5β, the first solenoid valve 13 is opened as before (Fig. 5 ■), and the discharge amount q3 is 10j7/mi.
When the amount of liquid supplied reaches the set amount, the first solenoid valve 13 is opened and the main valve 2 is fully opened to finish all liquid supply (Fig. 5 ■). ).

(Effects) As described above, according to the present invention, valves that operate independently to open and close these holes are provided in the liquid introduction hole and the liquid drainage hole that communicate with the liquid chamber on the back of the valve body. Therefore, the opening degree of the valve body can be set arbitrarily by controlling the opening and closing of the liquid introduction hole and the drainage passage hole, and the opening degree of the valve body can be maintained by closing the opening degree at the desired opening degree. This can be applied to devices such as liquid supply devices that require varying the discharge amount in multiple stages to significantly simplify the piping system and significantly reduce equipment costs.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a flow control valve showing an embodiment of the present invention;
FIGS. 2(a) to (C) are diagrams showing each operation, FIG. 3 is a diagram showing an example of a liquid supply device using the above flow rate control valve, FIG. 4 is a diagram showing its control circuit, and FIG. FIG. 5 is a diagram showing the relationship between the discharge amount and the operation of the solenoid valve.

Claims (1)

[Claims] The liquid chamber on the back of the valve body is provided with a liquid passage hole and a liquid drainage passage that communicate with the upstream and downstream sides of the liquid supply pipe, and the liquid passage hole and the liquid drainage passage are provided independently. A flow control valve comprising a valve that operates to open and close each of the through holes.