JPS5958283A - Optically operated solenoid valve - Google Patents

Abstract

PURPOSE:To both eliminate the influence of an electrical noise and form the total unit of a device in a compact size, by converting the opening and closing control instruction by light into an electric signal and controlling a solenoid valve to be opened and closed. CONSTITUTION:One end of a solenoid 22 in a solenoid valve 20 is connected to one end of a power supply 24 through a fuse 26, and the other end of the solenoid 22 is connected to the other end of the power supply 24 through a switching part 57 in a control means 59 equipping a photoelectric converter 55. An opening and closing control instruction by light fed through an optical fiber cable 6 is converted by the control means 50 into an exciting current flowing in the solenoid 22 of the solenoid valve 20, controlling a valve 26 of the solenoid valve 20 to be opened or closed. In this way, eliminating any necessity for interposing a buffer circuit of relay panel or the like for converting an electric signal level, the direct connection, being capable to an optically operated solenoid valve, both eliminates the influence of an electrical noise and forms the whole unit of a device in a compact size.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to electromagnetic valves, and in particular, to opening and closing the valve based on optical signals to eliminate electrical noise and to provide a suitable optical system for obtaining a good interface with a control system. Regarding operating solenoid valves.

As is well known, in a solenoid valve, a solenoid is provided in a valve that is opened and closed to control fluid, a plunger movably provided within the solenoid is connected to the valve, and the electromagnetic force generated by the solenoid and the plunger is connected to the solenoid. A spring biasing the valve in the opposite direction is interposed between the valve and its housing, and the valve is opened or closed by energizing the solenoid and attracting the plunger. This is what I did.

Hereinafter, a method in which the dLm valve opens when the solenoid of the dLm valve is energized will be described as an example.

According to the above-mentioned solenoid valve, the excitation current is supplied to the solenoid to open the valve.
The t current is supplied by opening or closing a relay contact or a semiconductor switch provided between the power source and the solenoid.

By the way, the electric power required to open the solenoid valve is generally about too (VA':l), and electromagnetic interference occurs when the solenoid is energized or cut off.

Furthermore, since the solenoid valve is installed close to mechanical equipment, it is susceptible to electromagnetic interference from other mechanical equipment.

Especially now that control systems are becoming more electronic,
There is a growing risk that the control system will malfunction due to the electrical noise, so it is necessary to pay sufficient attention to the interface between the control system and the solenoid valve.

For this reason, conventionally, as shown in FIG. 1, a buffer circuit 3 called a magnetic valve board is interposed between the electronic control system 1 and the solenoid valve drive circuit 2 to eliminate the influence of the electrical noise. Ta.

Below, FIG. 1 will be explained.

In FIG. 1, an electronic control system 1 includes a sequencer 10 that controls the system in a predetermined order, an output device 12 that outputs a signal from this sequencer 10, and a relay 14 that converts the signal of this output device 12 into a contact signal. It is composed of.

Further, the solenoid valve drive circuit 2 includes a solenoid 2 of the solenoid valve 2o.
2 is connected to one end of the power supply 24, and the other end of the solenoid 22 of the solenoid valve 20 is connected to the power supply 24 through a series circuit of a relay contact 30a from the buffer circuit 3 and a fuse 26.
It is configured by connecting it to the other end. Note that 28 is a valve of the solenoid valve 2o.

Further, the buffer circuit 3 is configured by connecting one end of the power relay 30 to one end of the power source 32 and connecting the other end of the power relay 30 to the other end of the power source 32 via the contact 14a of the relay 14. Buffer circuit 3 configured as described above
Since the electronic control system 1 and the electromagnetic valve drive circuit 2 are connected by converting the noise signal level, the influence of electrical noise is completely eliminated and the interface is easy.

However, although the control system is made compact and the control operation is ensured by using a sequencer using a microcomputer, etc., the buffer circuit 3 is required, so the entire control system is When considered as such, it has the disadvantage that it remains the same as before in terms of reducing the number of panels and ensuring control operations.

SUMMARY OF THE INVENTION An object of the present invention is to provide a light-operated direct solenoid valve that eliminates the drawbacks of the prior art described above, eliminates the influence of electrical noise, and has a good interface with a control system.

In order to achieve the above object, the present invention opens and closes the solenoid valve by converting a light-based opening/closing operation command into an electric signal and switching it to control the excitation current supplied to the solenoid of the stain magnetic valve. This is what I did.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 2 is a block diagram showing a schematic configuration of the optically operated solenoid valve according to the present invention.

In FIG. 2, a light-operated solenoid valve 5 that controls the flow rate of the fluid 4 in a binary manner (flow or not flow) receives an opening/closing operation command from light sent via a light 7 eyeper cable 6. The converted electric operation signal is used to control the excitation current flowing through the solenoid 22 of the solenoid valve 20 by the control means 50 for switching the excitation current flowing through the solenoid 22 of the solenoid valve 20. It is designed to open or close. Further, the solenoid valve 5 is a valve 26
A conversion means 53f is provided which switches the light from the multi-light source 52 to the optical switch 51 connected to the optical switch 51, converts the operating state of the valve 26 of the solenoid valve 2o into an optical signal, and outputs the optical signal via the optical fiber cable 7. It is composed of Note that 8 is a fluid pipe.

To explain in more detail, in the optically operated solenoid valve 5, the solenoid valve 2
One end of the zero solenoid 22 is connected to one end of the power source 24 via a fuse 26, and the other end of the solenoid 22 is connected to the other end of the power source 24 via a switching section of the control means 50. Further, the optically operated solenoid valve 5 is provided with a constant voltage power supply device 54, so that DC power is supplied to the control means 50 and the monitoring light source device 52.

The control means 50 of the optically operated solenoid valve 5 includes a photoelectric converter 55 that receives an optically operated command signal sent via an optical fiber cable 6 and converts it into an electrically operated command signal; It is composed of an amplifier 56 that amplifies the electrical operation command signal from the amplifier 56, and a switching section 57 such as a triac that is switched by the electrical operation command signal from the amplifier 56. The switching section 57
inputs the signal from the amplifier 56 to the gate terminal of the triac of the switching section 57, and connects the other end of the solenoid 22 and the other end of the power source 24 to the first and second switching poles.

The operation of the light first-power activation low valve 5 configured as described above will be explained below.

- When the solenoid 22 of the electromagnetic valve 20 is energized, the valve 26 moves to the left of the arrow, allowing or blocking fluid (for example, water, oil, air, etc.) 4 to pass therethrough. The optical closing operation signal is applied as an optical signal to the photoelectric converter 55 via the optical fiber cable 6, and is converted into an electrical signal.
The signal is amplified by the amplifier 56 and becomes a gate signal for the switching section 57.

The power supply 24 of the optically operated ridge valve 5 is used as an excitation source for the solenoid 22 of the solenoid valve 20, and at the same time is used as a power supply for the photoelectric converter 55, the amplifier 56, and the monitor light source device 52 via the constant voltage power supply 54. DC power is supplied as

On the other hand, regarding the monitoring of the operating state of the electromagnetic valve 20, the operating state of the electromagnetic valve 20 can be known by the movement of the valve 26. Therefore, the movement of the valve 26 is controlled by the optical switch 51 to turn on and off the optical signal transmitted from the light source device 52, and this optical signal is transmitted to the outside via the optical fiber 7.

This monitor signal is 7-kensa (central control unit) 10
It is possible to check the entire solenoid valve operation system by checking the operation signals sent by the operator.

FIG. 3 is a circuit diagram showing the connection of the optically operated solenoid valve 5 according to the present invention. As shown in the figure, the optically operated solenoid valve 5 is connected to the control system 1 through optical fiber cables 6 and 7, so there is no problem with the interface, and since it is an optical signal, it is completely immune to the effects of electrical noise. I don't accept it.

Further, the electronic control system 1 includes an output device 14 and an input device 1.
6 are provided, and it goes without saying that each device 14 and 16 is provided with an electrical-to-optical or optical-to-electrical converter.

Note that the control means 50 of the optically operated solenoid valve 5 is a photoelectric converter 5.
5, an amplifier 56 and a triac 57, but these devices may be omitted if, for example, an optical thyristor is used.

Further, the light source device 52 may be, for example, a light emitting diode, a semiconductor laser, or the like.

Furthermore, the photoelectric converter 55 may be anything that converts light into electricity, such as a phototransistor or a solar cell.

As described above, the present invention has the following effects.

(1) Since it uses an optical interface, there is no need to interpose a buffer circuit such as a relay board for electrical signal level conversion between the optically operated solenoid valve and the electronic control system, allowing direct connection to the optically operated solenoid valve. becomes. Therefore, the influence of electrical noise is eliminated and the entire device is made more compact.

(11) By using light, the state of the solenoid valve can be easily monitored externally. This makes it possible to diagnose not only the failure of the solenoid valve externally but also the attached photoelectric circuit by combining the input optical signal and the feedback monitor signal. The reliability of control operations is improved.

When mounting a semiconductor switching element in an 0IO solenoid valve, there is a high possibility that electrical noise may be picked up depending on the wiring in the middle when operating it using an external electrical signal, but since light is used, the wiring route in the middle is The problem of what to do with it disappears.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional example, FIG. 2 is a block diagram showing an overview of an embodiment of a light-operated magnetocardial valve according to the present invention, and FIG.
The figure is a block diagram showing the connection of the solenoid valve of the present invention. 5... Optically operated solenoid valve, 6, 7... Optical fiber cable, 20... Solenoid valve, 22... Solenoid, 26
...Valve, 51... Optical switch, 55... Photoelectric converter, 57... Switching section. 2nd drawing 3 eyes 0

Claims (1)

[Scope of Claims] 1. A solenoid valve that opens and closes the valve in response to an opening/closing command signal, characterized in that a control means is provided to open and close the solenoid valve by receiving an optical opening/closing command signal and converting it into an electric signal. A light-operated magnetic valve. 2. In claim 1, there is provided a control means for opening and closing the rlL+6 valve by taking in an optical opening/closing command signal and converting it into an electric signal, and converting the operating state of a solenoid valve opened and closed by the control means into an optical signal. 1. A light-operated control valve, comprising: an operating state output means for outputting an operating state.