JPS6072009A - Fluid control device - Google Patents

Abstract

PURPOSE:To make a device small-sized, and to reduce its cost by inserting and providing a controlling solenoid valve in a pipe, comparing and calculating a detecting value of a flow rate (pressure) transmitting device by a control unit, and driving said valve. CONSTITUTION:A controlling solenoid valve 13 is inserted into a duct 14 of the downstream side through a pressure source 12 from a process pipe 11. Also, an output of a flow rate transmitting device 15 installed in said duct 14 is transmitted to a control unit 16, and compared with a set value. A deviation is derived by said comparison, and said controlling solenoid valve 13 is driven. In this way, an output signal corresponding to said deviation is applied to the solenoid valve 13, a flow rate is controlled, and a constant flow rate is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a fluid control device that is used in process instrumentation, sampling instrumentation, radiation monitoring instrumentation, etc. of nuclear power generation to control the flow rate or pressure of a fluid.

[Technical background of the invention and its problems] A conventional flow rate side m device used for process instrumentation of nuclear power generation, radiation monitor instrumentation, etc. has a configuration as shown in FIG.

In the figure, 1 is a process pipe, 2 is a pressure source, and downstream of this pressure source 2, a valve 3, a pressure gauge 4, a flow meter 5, a constant flow valve 6, a pressure gauge 7, and a valve 8 are installed in this order. has been done.

In this flow rate control device, a design flow rate is calculated in advance, and a constant flow valve 6 that matches the design flow rate is selected.

When the flow rate passing through the constant flow valve 6 changes due to pressure fluctuations before and after the constant flow valve 6, the constant flow valve 6 is operated to control the flow rate in order to remove this influence and keep the differential pressure constant.

However, in such a configuration, in addition to the constant flow valve 6, the pressure gauges 4 and 7, the valves 3 and 8, and the flow control 6 are required, so the number of parts is large, the size is large, and the cost is high. However, there is a drawback that the flow rate cannot be set arbitrarily because it is set at one point or the setting range is small.

[Object of the Invention] An object of the present invention is to provide a fluid control device that has a simple configuration, can be made smaller, and can reduce costs.

[Summary of the Invention] The present invention provides a control unit in which a control solenoid valve and a flow transmitter or a pressure transmitter are inserted into a pipeline through which a fluid whose flow rate or pressure is to be controlled flows, and a signal from this transmitter is transmitted to a control unit] This is a flow rate control device that controls the flow rate or pressure of fluid by transmitting data to the control solenoid valve and driving the control solenoid valve.

[Embodiment of the Invention] FIG. 2 shows an embodiment of the present invention, in which 11 is a process pipe, 12 is a pressure source, and 13 is a control pipe inserted into a pipe line 14 downstream of this pressure source 12. A solenoid valve 15 is the pipe line 1
The output of this transmitter 15 is transmitted to a control unit 16, where it is compared with a set value and a deviation is detected. Further, the control solenoid valve 13 is driven by the output of the control unit 16. Note that 17 is a power source.

The control solenoid valve 13 is classified into a proportional control solenoid valve and a pulse control solenoid valve in terms of operation mode.

In the case of a proportional control solenoid valve, as shown in FIG.
6 is used, and the set flow m is determined from this proportional control controller 21.
A signal to keep the solenoid constant, for example, a signal corresponding to the operating stroke (see Fig. 4) or opening degree (Cv value) of the solenoid valve is given to the proportional control solenoid valve 13A, and the solenoid is held in that state. Keep the flow constant.

In the case of a pulse control solenoid valve, a control unit 16 having a pulse control controller 164 is used as shown in FIG. The pulse control solenoid valve 13A is opened by the pulse signal when , and closed when the reverse switch 16'6 is ON, and both switches 165.
When 166 is ON, the state is maintained and the pulse width is determined by the operation time as shown in FIGS. 6(a), (b), and (c).
Energize solenoid 3B and keep the flow rate constant while vibrating it.

When the control solenoid valve 13 is inserted into the pipe line 14 and driven by the control unit 16, the fluid flow rate in the process pipe 14 is detected by the flow transmitter 15, and the flow rate is detected by the control unit 16 as an analog signal.
If this signal is transmitted to control unit 1
The controller in 6 compares and calculates the set value, and an output signal corresponding to the deviation is given to the solenoid valve 13 to control the control solenoid valve 1.
3 is driven. In other words, the flow rate is controlled and the flow rate is constant.

In addition, although the flow rate of the fluid was controlled in the embodiment described above, it can be similarly implemented by controlling pressure.

In that case, as shown in FIG. 7, a pressure transmitter 21 is installed in place of the flow rate transmitter, and the signal is transmitted to the control unit 16 to drive the control solenoid valve 13. do.

[Effects of the Invention] As described above, according to the present invention, a control solenoid valve is inserted into a pipe through which a fluid flows, and a flow rate (pressure) transmitter is used to measure the flow m(
The drive is driven by a signal based on the result of a comparison calculation between the detected value (pressure) and the set value on the controller of the control unit, so the structure is simpler than the previous model, which required many piping elements (valve, pressure gauge, etc.). This makes it possible to reduce the size and cost by using a control unit that does not require a complicated electric circuit. In particular, the area required for process instrumentation or sampling instrumentation racks for nuclear power generation tends to be reduced, but as the flow control unit, which occupies a large proportion of the rack, can be made smaller, the size of the rack itself has become smaller over time. can greatly contribute to

Also, in small diameter piping such as sampling piping, v?
, Volume control, for example, flow rate control using an electric valve is difficult, but in the case of a control solenoid valve, it is possible to make the operating distance very short, and it is possible to control the flow rate of small diameter piping. be able to.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram showing an example of a conventional flow rate control device;
The figure is a block diagram showing one embodiment of the fluid control device according to the present invention, FIG. 3 is a block diagram for explaining the function when a proportional control solenoid valve is used as the control solenoid valve, and FIG. A characteristic diagram showing the relationship between the drive current and stroke of the control solenoid valve, Figure 5 is a configuration diagram to explain the function when a pulse control solenoid valve is used as the control solenoid valve, and Figure 6 is a pulse control solenoid valve. FIG. 7 is an explanatory diagram of a pulse signal used in the electromagnetic valve, and FIG. 7 is a configuration diagram showing another embodiment of the present invention. 11.14... Process piping, 12... Pressure source, 1
3...Control solenoid valve, 15...Flow rate transmitter, 16.
...Control unit, 21...Pressure transmitter. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] A control solenoid valve and a flow rate transmitter or a pressure transmitter are inserted into a pipe through which a fluid whose flow rate or pressure is to be controlled flows, and a signal from this transmitter is transmitted to a control unit to control the control solenoid valve. A fluid control device characterized in that it is configured to drive.