JPS63143400A - Display method for operating point of fluid - Google Patents

Abstract

PURPOSE:To facilitate any change of a set operable range of the fluid machine in the caption by displaying its operating conditions by means of a relative display between its operable range and an existing operating point. CONSTITUTION:On a CRT-screen 25 are displayed the piping diagram 31, the surging line 12, etc. of a blower as still pictures, and further displayed measured data, opening and/or closing conditions of valves, the existing operating point 18, an alarm 32, etc. as moving pictures. Thus, by making picture processing with the use of the CRT-screen 25 together with a broken-line coordinates storage table 20 and an operating point coordinate file 21, a set operable range can be easily changed.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is aimed at safely operating a fluid machine such as a blower (hereinafter referred to as a blower) by determining its operable range (depending on the relationship between discharge pressure and flow rate). (determined for each blower) and current position during operation (discharge pressure and flow rate values as operating point)
and t-CRTiI! [Regarding the method of displaying on the i-plane.]

[Conventional technology]

Conventionally, a general-purpose monitor scope (oscilloscope) has been used as a device for performing this type of display, and its configuration is as shown in FIG.

In FIG. 2, l is a monitor scope; 11. CRT
The screen 3 is a transparent plastic plate overlaid on the front surface of the CRT screen 2, and 4 is a bright spot (operating point) on the CRT screen.

FIG. 2A is a front view showing the transparent plastic plate 3 in FIG. 2 removed from the CRT screen 2. In FIG. 2A, reference numeral 5 indicates an operable area displayed on the transparent plastic plate 3, 6 a surge line (characteristic curve) also displayed, and 7 a choke line also displayed.

Please refer to FIG. 2 and FIG. 2A. The monitor scope 1 has two human power signal input terminals T1 for the X and Y axes. Any method may be used as long as it is received by T2 and generates a bright spot 4 at the intersection thereof. If the flow rate signal is plotted on the X-axis and the pressure signal is plotted on the Y-axis, the intersection point is displayed as a bright spot on the CRT screen as the operating point.

On the other hand, the boundary line is usually called the surging line, which is not a special term but a well-known term in fluid machinery (some trickle compressors also have an area called the choking line, but for the sake of simplification, K111. Dear, I will explain below using the surging line as an example).

The surging line 6 is determined by mechanical elements of the blower (not shown), and is finally determined by an actual load test after the blower is manufactured. In other words, the line at the time of design is a predicted line, and it is also necessary to make subtle corrections depending on the state after installation and mechanical changes after operation, so it is desirable that the line itself be a variable display.

[Problem that the invention seeks to solve]

However, the conventional method is to place a border (
This is a method of displaying a safe area by overlapping hand-drawn surging lines 6 and choking lines 7), which requires work such as rewriting each time the surging line 6 is changed.

Furthermore, although this monitor scope l was installed on the instrument panel, it was located far away from the other I gauges and indicator 8t, making it difficult to operate while keeping it in view at the same time.

In this invention, the surging line 1 is approximated by several polygonal lines, and by specifying the coordinates of the polygonal points, they are visually displayed on the CRT screen in the same way as the operating points, making it easy to change the display of the surging line. One purpose is to do something. In addition, this method can be combined with other operational information on the CRT console of the digital instrumentation device that has been put into practical use in place of the instrument panel, and provided to the operator as the same screen for convenience. For other purposes.

[Means for solving problems]

FIG. 3 is a block diagram showing means for solving the problem, and FIG. 3A is an enlarged view of the main part (display screen).

In these figures, 17 is CI (T control device), 20 is a polygonal line coordinate storage table, 21 is an operating point file, 15
is a pattern display, 16 is a vector display, 11Fi actually measured surging line, 12 is an approximate polygonal line, A-D
is the breaking point, (Xo tyo)...(Xn, yn)
are the same coordinates. Further, the operating point 18 is indicated by the coordinates (F, P). These are given to the CRT control device 17 by hardware or software, but any method is not important here.

It is desirable that this CRT be able to control dots (small bright spots in the smallest unit of pixels). Torera's C
RT is polygonal line coordinate storage table 20, operating point file 2
By giving the required information from 1, the pattern display 15
The surging line 12 and the operating point display 18 can be displayed in arbitrary colors and shapes (cross cursor, etc.) using the vector generator 16.

[Effect]

FIG. 4 is an explanatory diagram of the action. In the same figure, 25 is C
The RT screen, 26 is a still screen plane, and 27 is a moving image plane. A CRT control device normally converts the given information into pixels (dots) via a pattern display or vector display and displays them at a predetermined position by running scanning lines. Some of the information consists of data that constantly changes, while other information consists of data that does not need to be changed once it is set, such as the coordinate axis Rin.

Displaying data that does not need to be changed once it has been set on the screen through program operation is a disadvantage in terms of display speed.
There is also a problem in terms of visibility. That is, if a CRT screen such as a graphic screen is constantly and repeatedly displayed as data, not only will the screen flicker, but the display speed will generally drop significantly. Therefore, once the startup is required for display, it is stored in the pixel memory, and subsequent screen scanning is performed by reading it from the pixel memory, which can significantly speed up the display. This is called a still screen, and the pixel memory for it is called a still image plane and is indicated by 22).

On the other hand, the constantly changing data must be updated and displayed by running a program every refresh cycle to update its position and number mt, and these are stored in another pixel memory called a moving picture screen plane (23).

For example, in FIG. 4, point A shows the refresh position three times ago, point B shows the refresh position two times ago, point 0 shows the refresh position one time ago, and point D shows the current operating point. The latest position is memorized on the moving image screen plane 23 by clearing the previous data and storing the current data each time the screen is refreshed.

When the still screen plane 22 and the moving screen plane 23 are superimposed and displayed in the control device, it looks like the C81 screen 2.
5 is displayed on the CRT. In recent years, advances in memory devices and CRT display functions have made it possible to process multiple screens, and using these display methods for this purpose has many advantages in terms of ease of screen creation and improvement in processing speed.

〔Example〕

It is assumed that the method according to the present invention is applied to a CRT console (for example, a CRT console of a digital instrumentation system) currently functioning as a four-process monitor and control device.

FIG. 1 is an explanatory diagram showing one embodiment of the present invention.

In the same figure, on the CRT screen 25, the piping system diagram 31 of the blower, the measurement name, the aforementioned surging line 12, etc. are displayed on a static screen, and the measurement data, the opening/closing status of the pulp, the current operating point 18, and various indicator lights are displayed. (Alarm) 32 etc. move [1! It is displayed as the IT page. As is clear from Figure 1, on the display screen obtained by overlapping these, almost all of the information necessary for the operation of the blower is displayed in a concentrated manner, and the main text is displayed at the bottom of screen IIi. An indication of the operating status (surging line 12 and operating point 18) is shown according to the method.

Same C for plant monitoring and blower operating status monitoring
By incorporating it into the RT screen, information can be centralized,
Operator convenience will be greatly improved.

〔Effect of the invention〕

According to the present invention, the operating state of a fluid machine such as a hydraulic machine is displayed using a relative display t- of its operable area and current operating point, and is based on a polygonal line coordinate storage table and an operating point coordinate file. By processing the images together using a CRT, it is possible to easily set the operable area (surging line). In addition, as a screen display method, at least two screen planes are used, and after dividing the screen into a moving image and a still screen, the display speed can be completely improved by superimposing the images and displaying them. By displaying the same display in combination on the screen, it is possible to greatly improve operation monitoring performance.

[Brief explanation of the drawing]

@Figure 1 is an explanatory diagram showing an embodiment of the present invention, Figure 2 is a front view showing a monitor scope as a conventional example, and Figure 2A is a re-illustration of the transparent plastic plate in Figure 2. The front view, Figure @3 is a block diagram showing means for solving all the problems of the present invention, Figure @3A is an enlarged view of the main part (display screen), Figure 4 is a detailed explanatory diagram of the present invention, It is. Explanation of symbols 11. Song/actual surging line, 12.. Surging line approximated to the song, 15.. Song pattern indicator, 16.
...Vector display, 17. Curving CRT control device, 18. Curving point, 2o... Polygonal line coordinate storage table, 21. Curving point file, 25... For... Still screen plane for CRT screen, 26..., 27...
...Video screen plane, 31...Curved piping system diagram, 32
・・・・・・Indicator light agent Patent attorney Akio Namiki Agent Patent attorney Kiyoi Matsuzaki 1 Figures 1 and 2 Figures of the 2nd figure and 3 figures Addendum

Claims (1)

[Claims] 1) In a CRT (cathode ray tube) device for displaying a screen for process monitoring installed in a CRT (cathode ray tube) console for plant operation, the operable region based on the operating characteristics of a fluid machine such as a blower can be approximated by a polygonal line. The CRT of the CRT device has a polygonal line coordinate storage table that stores coordinates necessary to display as a boundary line, and a refresh memory that receives and refreshes measured values of various quantities representing operating points of the fluid machine. A method for displaying an operating point of a fluid machine, characterized in that, in addition to the process monitoring screen, an operable area and an operating point of the fluid machine are also displayed on a screen.