JPS6075909A - Valve monitor device - Google Patents

Abstract

PURPOSE:To obtain a simple monitor device by providing the 1st and 2nd limit switches to a motor operated valve and displaying with inversion of a symbol pattern of the valve with the binary signal outputs corresponding to the open/ close of the limit switches. CONSTITUTION:A limit switch S1 has a constant close contact and opens this contact with full open of a motor operated valve 8 which is done by a valve drive motor 9. While a limit switch S2 has a constant close contact and opens this contact with full close of the valve 8. The motor 9 is fed through a feeder 18, and the power is fed to both switches S1 and S2 and pilot lamps 20 and 21 via a rectifying power supply device 19. These lamps 20 and 21 are shown in different colors and monitored by a central control board, etc. In addition, relays 16 and 17 are set in parallel to the lamps 20 and 21. Then constant close contacts 16-1, and 17-1 of relays 16 and 17 are connected to an input part 12 of an electronic computer 14. Thus the right and left halves of a butterfly-shaped valve symbol pattern are displayed independently of each other on the screen of a CRT display device 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a valve monitoring device in a monitoring panel that simulates a plant system.

[Technical background of the invention and its problems]

In industrial plants including thermal and nuclear power plants,
In addition to displaying a simulated plant system diagram on the monitoring panel, the measured values of various state quantities of Zorothes are simultaneously displayed on this monitoring panel and used for monitoring, controlling, and controlling the plant. ing.

Figure 1 shows an example of a plant displayed on a CRT screen of a graphic display device using a computer, which is one of this type of monitoring equipment. In addition to figure 2, symbols and figures 3 for turbines, symbols and figures 4 for condensers, symbols and figures 5 for pumps, symbols and figures 6 for valves, etc. are arranged as appropriate and are displayed together with a diagram 7 representing the piping that connects them. . Note that numbers, characters, etc. (not shown) representing various quantities of the process are also displayed at convenient locations on the same screen.

In addition, in such a graphic display, states such as starting or stopping a pump or opening or closing a valve can be expressed by changing the pattern of each symbolic figure, for example, an outline pattern depicting only the outline of the figure, or the entire figure. Distinguishable display is performed by switching to one of a variety of patterns in which the area is depicted in a single color.

Here, a motor-operated valve is represented by a graphically displayed symbol and figure, and a device for monitoring the open/closed state of this motor-operated valve will be explained with reference to the drawings. In FIG. 2, an electric valve 8 that is installed in the plant and forms a part thereof is provided with a limit switch s1 and a limit switch S2, which are engaged with an electric valve drive motor 9 via gears or the like. There is.

As shown in FIG. 3(B), the limit switch S1 is
It is normally closed and opens when the motor 9 is rotated and the electric valve 8 reaches full open (valve opening 100%).Similarly, the limit switch s2 is normally closed and the electric valve 8 is opened. It is arranged to open when the valve reaches full open (valve opening degree 0). FIG. 2 shows a case where the electric valve 8 is fully closed. In addition, the central open-side l room of the plant V is a central processing unit (hereinafter referred to as CPU), which is used for process control and monitoring, which is composed of a storage unit 11, an input unit 12, and an output unit I3.
An LR truss 14 is installed, and both terminals of each of the IJ Mitsutwitches S1 and s2 are connected to the input section 12 of this tunq-tawara 14. A CR1 display device 15 is connected to the output section 13 of the computer 14 as one of the output devices.

CR1 display device 15! The plant system diagram shown in FIG. 1 is displayed using the equation 14i, and the electric valve 8 is displayed as a linear symbol figure 6.

The symbol figure 6 has a left half 6a and a right half 6b that can be displayed independently by switching to an outline pattern or a solid pattern. 14, and in response to opening or closing of the limit switch s1, the left half 6a has a contour chisel turn or a solid pattern.
Similarly, in response to opening or closing of the limit switch S2, the display of the right half 6b is switched to a solid pattern or a contour pattern. Therefore, corresponding to the valve opening degree of the electric valve 8, the chisel turn of the symbol figure 6 is as shown in FIG. When the valve opening degree is 100% (fully open), both the left half part 6a and the right half part 6b have a contour pattern.
When the valve opening degree is intermediate, the left half 6a displays a solid pattern and the right half 6b displays a contour turn.

On the other hand, if the power to the electric valve drive motor 9 is lost for some reason, the symbol and figure 6 will continue to display the stop position of the electric valve 8 at the time of power loss; Since the action is lost, it is inconvenient to control the electric valve 8 based on the monitoring of the symbol figure 6. For this reason, a detector (not shown) such as an undervoltage relay is installed in the power supply of the drive motor 9, and when the power is lost, the signal from this detector is input to the computer 14, and a plant system diagram is displayed. At an appropriate location on the screen of the CR1 display device 15,
Measures were taken to display the information using letters, figures, etc.

However, in the above-mentioned monitoring device, when monitoring the electric valve 8, the wiring from the limit switches S1 and S2 for detecting the valve opening and the wiring from the detector for detecting loss of power are connected to the computer 14. Not only that, but also the monitoring points regarding the electric valve 8 are dispersed in two places on the screen of the CR1 display device 15, which has the disadvantage of making the monitoring work complicated.

[Object of the invention] ′ The object of the present invention is to check the valve opening of an electric valve and the life and death of the driving power source for this electric valve in monitoring and controlling a plant.
It is an object of the present invention to provide a simple valve monitoring device that can also be displayed as a change in the symbol/figure representing the electric valve on a display device.

[Summary of the invention]

In the present invention, the valve opening degree of a motor-operated valve installed in a plant is displayed by a pattern change of a symbol figure of the motor-operated valve drawn on a display device of a computer installed in the plant. The symbol and shape of the valve that is
By changing the pattern, we focused on the fact that we have four types of display classification ability. a second limit switch that inverts, first and second control elements that input binary signal outputs corresponding to opening and closing of the first and second limit switches to the computer, respectively; The combination of the power supply that commonly energizes the second control element and the electric valve, and the output signal values of the first and second control elements is determined by the pattern of the first half and second half of the symbol figure of the valve. Provided is a valve monitoring device f, which is equipped with a means for displaying binary inversions, and displays the fully open position, intermediate position, and fully closed position of a motor-operated valve in a power activation state, as well as the power loss state of a heart-operated valve. The above objective is achieved by displaying the symbols and shapes of the electric valves by electrifying them by chisel-turning.

[Embodiments of the invention]

Embodiments of the valve monitoring device 1'-' according to the present invention will be described below with reference to the drawings. omitted.

FIG. 4 is a wiring diagram showing the configuration of one embodiment of the present invention,
In the figure, 81 is a limit switch. This limit switch S1 has a normally closed contact that is always closed, and the heart valve 8, which is linked to the rotation of the valve and small movement motor 9, is fully open (valve opening degree 1
0 (transfer) It operates and opens the contact when VC is reached. On the other hand, the limit switch S2 has a normally open contact and operates to open the contact when the heart valve 8 reaches a fully open position (valve opening degree is 0). FIG. 4 shows that the electric valve 8 is in a fully closed state. This electric valve 8
The drive motor 9 that drives is supplied with power by a three-phase power supply line 18, and two phases of this three-phase power supply line 18 are connected to both limit switches 81,
It is connected to each of the a and b terminals of S2 by conductive wires. An indicator lamp 21 is connected in series in the middle of the conductor connecting each terminal of both limit switches 81, 82 and one terminal on the output side of the rectifier power supply 19, and this indicator lamp 21 is connected in series. , 21 are supplied with direct current converted from alternating current by a rectifying power supply 19. The two indicator lamps 21 are classified into red and green, for example, and are installed on a central control console or the like in a central control room (not shown) for monitoring.

As shown in FIG. 4, when the electric valve 8 is fully closed, a red indicator lamp is lit and a green indicator lamp 21 is turned off. Relays 16 and 17 are connected in parallel to the display lamps 2Cj, 21, respectively.
t 17 operates in synchronization with the image display lamp (a) and 21. Relay 16 is limit switch S
Similarly, the relay 17 has a normally open contact x611* that corresponds to the normally closed contact of limit switch $2 and operates synchronously, and the relay 17 has a normally open contact 17 that corresponds to and operates synchronously with the normally closed contact of limit switch $2. -1 (il- has both normally open contacts 16
-1 and 17-1 are electrically connected to the input section 12 of the computer 14, and the open/closed states of both contacts +6-1 and 17-'1 are read by the CPU 10 as binary signals of ON and OFF. It has become.

Then, depending on whether the contacts 16-1 and 17-1 are opened or closed, that is, ON or OFF, a symbol of a valve having an external shape as shown in FIGS. 5(A) and 5(B) is displayed on the screen of the CRT display device 15. The computer 14 is configured to be displayed as a graphic 6. As shown in Fig. 1, the symbol figure 6 of this valve has a left half 6a and a right half 6b of its outer shape that can be displayed independently by switching to a contour pattern or a solid/ξ turn. . That is, for example, as shown in Fig. 5 (N), in the case of normally open contact 16-1 crab 〇N, the valve symbol figure 6
The left half of is a solid pattern, and when it is OFF, the left half is displayed as a contour) ξ turn. In addition, normally open contact 17-
When 1 is ON, the right half of the valve symbol figure 6 is displayed as an outline pattern, and when OFF, the right half is displayed as a solid pattern.

Next, the operation of the above-described embodiment will be described. When the electric valve 8 is fully closed due to the rotation of the drive motor 9, that is, when the valve opening degree is 0, the limit switch S1 does not operate and its normally closed contact remains closed, that is, the ON state is maintained. Therefore, a closed circuit is formed between the red indicator lamp and relay 6 connected to this limit switch S1 and the rectifier power supply 19, the red indicator lamp is lit, and the relay 16 is connected to the limit switch S1.
The excitation coil is energized and the normally open contact 16- of the relay 16 is energized.
1 is closed, ie switched ON. Further, the limit switch S2 operates when the valve opening degree of the electric valve 8 is 0%,
Its normally closed contacts are switched open, ie, OFF.

Therefore, the green indicator lamp 21, relay 17 and rectifier power supply 19 connected to this limit switch S2
The circuit with is opened, the green indicator lamp 21 goes out,
The excitation coil of the relay 17 is de-energized, and its normally open contact 17-1 remains open, ie, in the OFF state. The ON state of this normally open contact 16-1 and the O state of normally open contact 17-1
The FF state is read by dPUlo of the computer 14 and displayed as an external valve symbol figure 6 on the screen of the CR7 display device 15. As shown in Fig. 5 (A), the left half of this square symbol figure 6 has a solid ξ turn, and its right half is also shown in a solid pattern, as shown in Fig. 5 (B). It is displayed that the cardiac valve 8 is in the valve opening degree θ, that is, in the fully closed ':+ state.

On the other hand, when the electric valve 8 is fully open, that is, the valve opening is 100, the limit switch S1 opens IIUJ, and its normally closed contact is switched to open, that is, OFF.

Therefore, the application of the red indicator lamp and the supply of oxygen to the relay 16 are cut off, the red indicator lamp 20 goes out, and the excitation coil of the relay 16 is de-energized.
The normally open contact 16-1 of No. 6 maintains an open state, that is, an OFF state. Further, the limit switch S2 does not operate when the valve opening degree of the electric valve 8 is 100, and its normally closed contact remains closed, that is, remains in the ON state. This normally open contact 16-1
The OFF state of the contact 7-1 and the ON state of the normally open contact 7-1 are read by the CPU of the computer J4, and are shown in FIG. 5(A).
, As shown in (B), the valve notation indicates that the valve opening degree is 100%, that is, it is fully open.

Further, when the valve opening degree of the electric valve 8 is within θ to 100 degrees, both limit switches 81 and 82 are inoperative, and their normally closed contacts are both closed, that is, maintained in the ON state. Therefore, the red and green display lamps 21 are turned on, and both the excitation coils of both relay coils 16 and 17 are excited. For this purpose, both normally open contacts 16-1 and '17-1 of both relay coils 16 and 17 are closed, that is, switched ON. Both normally open contacts 16-'1, 1
Each ON state of 7-1 is read by the CPUl0 of the computer 14, and as shown in FIG. is displayed on the screen of the CRT display device [5], indicating that the motor-operated valve 8 is within the valve opening range of 0 to 100 degrees, that is, is at a medium opening.

By the way, if the power to the drive motor 9 of the electric valve 8 is lost for some reason, both limit switches 81 and S2
does not operate, and the display lamp 21 and both relays 16 and 17, which share the power source of the drive motor 9, are turned off, and their excitation coils are de-energized. As a result, both normally open contacts 16-1 and 17-1 are kept open, that is, in the OFF state. Both normally open contacts 16-1
．． The OFF state of 17-1 is read by the CPU 10 of the computer 14, and as shown in FIG. 5 (4) (B), the left half of the outer shape of the valve symbol figure is an outline pattern, and the right half is a solid pattern. is displayed on the screen of the CR7 display device 15, indicating that the electric valve 8 has lost power. In this way, the electric valve 8
Since the state of failure is displayed at the same location on the screen of the CRT display and device 5 by the external valve symbol figure 6 indicating the opening degree of the electric valve 80, the monitoring work is significantly reduced.

In addition, in the above-mentioned embodiment, the symbol figure 6 of the valve was shown as an example in which the contour chisel turn and the solid pattern stand out.
The present invention is not limited to this, but for example, the left half and right half of the outer shape may be displayed in two colors.
You can also change the colors.

In addition, in addition to being used as a monitoring device to display valve status, if the calculator is also used for process control, the computer can perform processing based on the valve monitoring data, and then use the computer for process control. It can also be output as

〔Effect of the invention〕

As explained above, the valve monitoring device according to the present invention has a symbol graphic of the electric valve installed in the plant that displays the valve opening degree of the electric valve on the display device of the electric W machine installed at θ in the plant. a first limit switch that is provided on each of the electric valves and that is reversed only when the electric valve is fully opened; and a second limit switch that is reversed only when the electric valve is fully closed; first and second control elements that respectively input binary signal outputs corresponding to the opening and closing of these first and second limit switches to the computer; The combination of a power supply that commonly energizes the valve and the output signal values of the first and second control elements is binary-inverted in the patterns of the first half and the second half of the symbol figure, respectively. and means for displaying the information.

Therefore, a CRT that simulates and displays a plant system diagram
On the screen of the display device, the state of power loss of the motor-operated valve can also be displayed using the valve symbols and graphics that originally display the opening states of the 11-member valves.

As a result, 'fj+5! J valve opening status and its it+
The power loss state is displayed at the same location on the screen of the CRT display device, so just by looking at one point, you can monitor both the opening state of the electric valve and its power loss state. It also becomes easier to identify. -! In addition, both signals related to valve opening and power supply status can be input to the 'l1iL calculator via the same wiring via the relay of the control element, so the cables required for this wiring are smaller than wiring for each signal. Installation of: jji k ffIJ has the effect that it can be reduced.

[Brief explanation of the drawing]

Figure 1 is an example of a display on a graphic display device using a general computer, Figure 2 is a wiring diagram to explain the configuration of a conventional valve monitoring device, and Figure 3 (5) is a limit Figure 3 (B) is a chart showing the correspondence between the switch position and the pattern of the symbol and figure of the valve; The figure is a wiring diagram showing the configuration of an embodiment of the present invention, FIG.
A) is a diagram showing the correspondence between the relay contact and the valve symbol and figure Ap-n, and Figure 5 (B) is the same diagram showing the correspondence between the valve opening and the valve symbol and figure E-turn. This is a chart showing. 1...CR7 screen, 6...Valve symbol figure, 8...
Electric valve, 9... Drive motor, ■0... CPU,
DESCRIPTION OF SYMBOLS 11... Storage part, 12... Input part, 13... Output part, 14... Computer, 15... CRT display device, 1
6, 17... Relay, 16-1.17-1... Normally open contact, 18... Power supply line, 19... Source device for rectification,
Addition, 21...Display lamp, SL, S2...Limit switch. Applicant's agent Hisashi Hatano Figure 3 (A) (B) Figure 12 10 13

Claims (1)

[Scope of Claims] 1. In a system for displaying the valve opening degree of a motor-operated valve installed in a plant by a pattern change of a symbol figure of the motor-operated valve extracted on a display device of a computer installed in the plant, A first limit switch that is provided on each of the electric valves and that reverses only when the electric valve is fully open, and a second limit switch that reverses only when the electric valve is fully open, and each of these first and second limit switches. first and second control elements that respectively input binary signal outputs corresponding to opening and closing of the computer into the computer;
and a second control element and a source that commonly energizes the electric valve, and a combination of output signal values of the first and second control elements in a first half and a second half of the symbol figure. A valve monitoring device characterized by comprising means for displaying each of the patterns in binary inversion. 2. The first and second control elements are relays each having an excitation winding connected in series with the first and second limit switches and energized by the power source. A monitoring device for the valve described in Section.