JPS629798B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The first and second inventions according to the present invention detect the output states of a large number of gas sensors arranged at required locations within a monitoring area, for example, by monitoring the output states of a cathode ray tube. Gas alarm TV central monitoring system that enables centralized monitoring at one location by displaying graphics on the tube surface and simultaneously displaying a predetermined preliminary warning level and alarm level on the display screen of an image display device. It is.

[Conventional technology]

Conventionally, gas leak alarms have been used to monitor gas leaks. An example is shown in FIG.

In FIG. 10, 40 indicates a gas leak alarm, 41 is a housing, 42 is a gas intake port, 43 is a gas sensor provided in the housing 41, 44 is an alarm buzzer, 45 is an alarm lamp, and 46 is a gas leak alarm. power lamp,
47 is a power cord.

A gas leak alarm 40 having such a configuration is installed at each location where gas leaks are to be monitored. When a gas leak occurs, gas enters through the gas intake port 42 and comes into contact with the gas sensor 43. When the gas sensor 43 comes into contact with gas, for example, its resistance value changes (there are various types depending on the type of gas sensor 43), and this change is converted into an electrical signal and the alarm buzzer 4 is activated.
4 or flashes an alarm lamp 45 to notify that there is a gas leak.

[Problem that the invention seeks to solve]

In this way, in the conventional gas leak alarm 40,
When a gas leak occurs, the alarm buzzer 44 and alarm lamp 45 of the gas leak alarm 40 in the vicinity are activated to notify the gas leak, but this does not allow for remote monitoring, and It is not possible to know where and where the gas leak has occurred, or how the gas leak status changes from time to time. For this purpose, the outputs of each gas sensor 43 are collected on one panel, each output is associated with each meter on the panel in pairs, and the state of the output of each gas sensor 43 is constantly monitored from the needle or digital display value of each meter. However, when there are a large number of monitoring points, it becomes a difficult task to simply read the readings of each meter, and it is even more difficult to read them one by one while instantly determining whether or not the readings are abnormal. That's not the point. Moreover, it was completely impossible to observe the behavior of the gas as a whole at a glance just by reading the readings of individual meters.

In view of the above points, the first and second inventions according to the present invention provide image display devices such as cathode ray tubes (hereinafter referred to as cathode ray tubes).
The purpose of this invention is to provide a gas alarm TV centralized monitoring system that displays the output of each gas sensor 43 in a TV (television) style using a CRT (CRT).

[Means for solving problems]

A first invention according to the present invention includes: a sensor output section to which outputs from gas sensors respectively arranged at required locations within a monitoring area are applied; a scanning section that sequentially detects each output of the sensor output section; A control section that performs graphical processing on each output and timing output obtained from the scanning section and sets a preliminary alarm level and an alarm level, and a bar graph and numerical representation of each output that has been subjected to graphical processing and timing output of the control section. and an image display device for displaying the preliminary warning level and the warning level on the graphical display.

Further, a second invention according to the present invention includes a sensor output unit to which outputs from gas sensors respectively arranged at predetermined locations within the monitoring area are applied, and a scanning unit that sequentially detects each output of the sensor output unit. , a control section that performs graphical processing on each output and timing output obtained from this scanning section and sets a preliminary alarm level and an alarm level; an image display device that displays the preliminary alarm level and the alarm level on the graphic display;
The apparatus further includes a video recording device that is activated when at least one of the gas sensors reaches a preliminary warning level or an alarm level and records the output of the control section to the image display device.

[Effect]

In the first and second aspects of the present invention, the output of each gas sensor is constantly displayed in the form of a bar graph on the display surface of the image display device. A preliminary alarm level and an alarm level are displayed on the display screen, and are used to determine whether the output of each gas sensor is abnormal or normal. The clock output is displayed in numbers on the display screen, indicating the time.

Furthermore, the second invention is equipped with a video recording device, which is activated when at least one of the gas sensors reaches a preliminary warning level or an alarm level, and records subsequent images on the display surface of the image display device. It will be used as a material for elucidation.

〔Example〕

FIG. 1 shows an embodiment of the first and second inventions (hereinafter simply referred to as this invention unless there is a need for special distinction) according to the present invention, in which 1 is a sensor section, 1 ₁ , 1 It is composed of ₂ , ..., 1 _o gas sensors, and each gas sensor 1 ₁ to 1 _o is arranged at a required location within the monitoring area. 2 is a sensor output section to which the outputs of each of the gas sensors 1 ₁ to 1 _o are added. 3 is a scanning section that scans the n outputs of the sensor output section 2 and sequentially outputs them. Reference numeral 4 denotes a control unit, which is configured using, for example, a central processing unit (hereinafter referred to as CPU). Reference numeral 5 denotes an operation section, which includes a switch 31, a buzzer 38, etc., which will be described later. 6 is a wind direction/anemometer, which outputs two values of wind direction and wind force and controls the control unit 4.
Enter. Reference numeral 7 denotes a CRT, which displays necessary figures, characters, time, etc. on a screen 7A according to the output of the control section 4. Reference numeral 8 denotes a video tape recorder (hereinafter referred to as VTR), which is a type of video recording device, which is started and stopped by remote control from the control unit 4, as shown by dotted lines, and records the contents displayed on the CRT 7. Therefore, whenever necessary, the records can be
It can be reproduced and displayed on the tube surface 7A of the CPT 7.

FIG. 2 is a layout diagram showing an example of the arrangement of the gas sensors 1 ₁ to 1 _o . Reference numeral 11 indicates a monitoring area, and roads 12 and 13 are provided perpendicularly to the center. Reference numeral 14 indicates a workbench equipped with, for example, a gas filling pump, and reference numeral 15 indicates gas equipment such as a gas tank, which are arranged as shown in the figure, for example. The gas sensors 1 ₁ to 1 _o are placed at key points.
In the event of a gas leak, care has been taken to make it easy to detect the gas concentration at which location and take countermeasures.

Next, a description will be given of how the outputs of the gas sensors 1 ₁ to 1 _o are displayed on the tube surface 7A of the CRT 7 in FIG. 1.

Figure 3 shows 20 gas sensors ₁₁ to ₁₂₀ (first
, when n = 20 in Figure 2),
This is a bar graph showing each output value in the form of a bar on the tube surface 7A of the CRT 7, with the length thereof being proportional to the output value, and corresponds to the main part of the present invention. That is, in FIG. 3, 5, 10, etc. represent the numbers of gas sensors 1 ₁ to 1 ₂₀ , 21 is the sensor number,
22 is a 0 level line whose output is 0, 23 is a preliminary warning line which is at a level to issue a preliminary warning, 24 is a warning line which is at a level to issue a warning, and 25 is a time display section showing the instantaneous time. The example of FIG. 3 shows that gas sensor 1 ₁₄ has exceeded the preliminary alarm level and gas sensor 1 ₂₀ has exceeded the alarm level. And you can see that the time is 15:03:12. All of the other gas sensors are below the preliminary warning level and are in the background, so there is no abnormality. Since there is an abnormality in the gas sensor ₁₂₀ , the situation is such that an alarm must be issued as soon as possible and countermeasures must be taken.

FIG. 4 shows gas sensors 1 ₁ to 1 ₂₀ as described above.
If an abnormality occurs in any of the areas, the location of the abnormality is shown on the tube surface 7 of the CRT 7 along with the layout diagram in Figure 2.
This is an example of displaying on A. That is, as will be described later, if an abnormality occurs in any of the gas sensors 1 ₁ to 1 ₂₀ (in the above example, gas sensor 1 ₂₀
(an abnormality has occurred), the tube surface 7A is switched to display a layout diagram as shown in FIG. 4, and the gas sensor ₁₂₀ in which the abnormality has occurred is blinked. Therefore, by looking at the tube surface 7A, it is immediately clear which gas sensor is producing an abnormal output. Also, 16 is a wind direction display mark, 17 is a wind force display mark, and the fourth
In the example in the figure, you can see that the wind is blowing to the northeast.
Further, in the illustrated example, the wind force is "5".

FIG. 5 shows an example of a message instructing the process to be taken when an abnormality occurs. Prepare various types of messages in advance in anticipation of an accident. In other words, the location of the abnormality, the wind direction,
Countermeasures to be taken at that time are determined in consideration of wind force, temperature and humidity, and displayed on the tube surface 7A to instruct countermeasures suitable for the situation at the time of occurrence of an accident. In the example shown in FIG. 5, it is displayed that the gas sensor ₁₂₀ has an abnormal output, and an instruction is given to "close the first valve." Although the second and subsequent steps are omitted, appropriate countermeasures are actually displayed one after the other. Finally, "Caution. 14" is displayed, and "Gas sensor 14" is displayed.
It is also displayed that the output is different from the normal state.

FIG. 6 shows a panel surface 30 of the operation unit 5 for switching the displays shown in FIGS. 3, 4, and 5.
The sensor output section 2, scanning section 3, control section 4, etc. shown in FIG. 1 are housed within the housing of the operating section 5. In this figure, numeral 31 is a switch that can be switched to three stages, positions A, B, and C. Position A is the "sensor output", and at this position, the outputs of the gas sensors 1 ₁ to 1 _o are switched to the positions shown in Figure 3. Display as follows.
Under normal conditions until an abnormality occurs, the pipe surface 7A should be in the state shown in Figure 3, and the monitor should connect the preliminary warning line 2.
All you have to do is check whether there are more than 2 gas sensors. Position B is the "sensor arrangement" and the display shown in FIG. 4 is performed. Position C is "message" and the display shown in FIG. 5 is performed. In addition, 32 is a power switch, 33 is a reset switch, 34 is a power indicator light, 35 is a sensor failure lamp, 36 is a preliminary warning lamp, 37 is an abnormality warning lamp, 38 is a buzzer, and a timing device (not shown) is also provided. Built-in.

Next, the overall operation of the embodiment shown in FIG. 1 will be explained. As mentioned earlier, under normal conditions, the switch 31 is at position A, so the outputs of the gas sensors ₁₁ to _1o are displayed in the form of a bar graph on the tube surface 7A of the CRT 7, as shown in FIG. Ru. That is, the outputs of the gas sensors 1 ₁ to 1 _o are sequentially detected from the sensor output section 2 to the scanning section 3 and then input to the control section 4 . In the control section 4, the output from the scanning section 3 is A/D converted into data, and this and the numbers of the gas sensors ₁₁ to _1o are passed to the CPU. The CPU stores these data in memory and displays them graphically as shown in FIGS. 3 and 4. Since the processing means for graphical display is conventionally carried out by various computers, the details thereof will be omitted. In addition, the CPU of the control unit 4 receives countermeasure messages determined in advance based on the location of the accident, wind direction, wind force, etc.
It is stored in the CPU memory, and if there is an abnormal output, the necessary A message is pulled out and a buzzer 38 is sounded to notify the guard of the abnormality. Then, the supervisor turns the switch 31 to position B and changes the display to the one shown in Figure 4, and finds that the gas sensor at the location where the failure occurred, that is, where the gas leak occurred, for example, ₁₂₀ , is blinking, so the entire When the switch 31 is turned again to position C after checking the relationship between the location of the switch and the location where the failure occurred, a message indicating the procedure for handling the accident shown in FIG. 5 appears on the screen 7A. Therefore, you can read it and give appropriate instructions to the field. Then, at the same time as an abnormality occurs, a remote control command indicated by a dotted line is issued from the control section 4 to start the VTR 8.
As a result, all images of the tube surface 7A after that time are recorded. Therefore, in order to analyze the accident at a later date, the recording on the VTR 8 can be played back and displayed on the screen 7A or another CRT 7.

Next, linearization regarding the graphical display of FIG. 3 will be explained. The output values of gas sensors 1 ₁ to 1 _o are A/D converted and sent to the CPU, but when displayed on the same scale, it is fine if the gas sensors are of the same type, but if there are many types, they will be at the same level unless linearized. This makes it difficult to monitor alarms. For linearization, either a calculation method using an approximation function or a method of preparing a conversion table corresponding to a calibration curve may be used.

Next, an example of the wind direction/anemometer 6 will be described.
FIG. 7 is a principle diagram for explaining wind direction detection, in which AC cell thin motors 41 and 42 are arranged on the sending side of S and the receiving side of R, and the excitation windings 41 and 42 of both are arranged.
f and 42f are excited by an AC power source 43 via a switch 44. The rotor 41r rotates according to the direction of the wind. Due to this rotation, each phase U, V,
A voltage is generated between W in accordance with the rotation, and the rotor 42r rotates to cancel this voltage, thereby performing an operation to follow the rotor 41r. Voltages V ₁ , V ₂ , and V ₃ are generated in each phase of the rotor 42r. Therefore, if two of these, for example V ₁ and V ₂ are used, the rotor 4
The rotational position of 2r, that is, the wind direction can be determined. Note that a resistor may be connected to Y or Δ instead of the rotor 42r.

FIG. 8 is a block diagram showing the measurement of both the wind direction and the wind force. Reference numerals 51 and 52 are wind direction output sections, where the voltages V ₁ and V ₂ are detected, and this is applied to the level regulator 5.
3 is input. On the other hand, in the AC power supply 54, for example, a sine wave voltage of 100V is converted into a 90° phase by a delay circuit 55.
The zero value is detected by the zero detection unit 56, and the instantaneous values of the voltages V ₁ and V ₂ at that timing are detected. That is, the counter or shift register 57 counts every time a zero is detected, and the analog switches 58, 59, and 60 are sequentially closed at each count or every appropriate number of counts (the analog switch 60 will be described later). Now, when analog switch 58 closes, voltage V ₁ is digitized by A/D converter 63 and latched into one of latch circuits 64. Similarly, when analog switch 59 is closed, voltage _V2 is digitized and latched. The wind direction is determined by outputting these two digital values to the input port 65 and comparing them with values previously stored in the memory within the CPU.

Next, regarding wind power (wind speed), the rotational speed of the wind speed generator 61 increases in proportion to the wind speed, and therefore the output voltage V ₀ is also proportional to the wind speed. This voltage V ₀ also passes through the rectifier/voltage regulator 62 and is digitized and latched by the A/D converter 63 when the analog switch 60 is closed. Therefore, using this value, the wind power is calculated as CRT7 (first
(Figure) can be displayed on the tube surface 7A.

Figure 9 shows an example of how to display the wind direction and wind force.The wind direction is indicated by an arrow, and depending on the direction, north, northeast,...northwest, etc. are indicated, and the wind force is indicated by numbers. . That is, if the number is "5", the wind power is "5".

In the above embodiment, various displays are performed using the CRT 7, but the present invention is not limited to the CRT 7, and it is also possible to use one using a liquid crystal or other image display devices. Furthermore, the lines indicating the levels of the preliminary warning line 23, warning line 24, etc. in FIG. 3 may be dotted lines, or arrows may be attached to the ends of the levels. Alternatively, the bar graph itself may be blinked. Furthermore, in the above description, in addition to the display in FIG. 3, the display in FIGS. 4 and 5 is also performed by the switch 31, but the present invention does not necessarily require the display in FIGS. The entire situation of the abnormal state and its occurrence can be known only by the display in FIG. 3, thereby making it possible to achieve the object of the present invention.

〔Effect of the invention〕

As explained in detail above, the first and second aspects of the present invention are such that the outputs of a large number of gas sensors arranged within a monitoring area are constantly displayed as a bar graph on the display screen of the image display device. , you can see the output of each gas sensor at a glance. Moreover, since the preliminary alarm level and the alarm level are displayed on the display screen of the image display device, it is possible to clearly determine whether the output of each gas sensor is abnormal or whether it is about to become abnormal. moreover,
Since the time is displayed on the display screen of the image display device at the same time, this is extremely convenient in case of an emergency. Further, a second invention according to the present invention is provided with a video recording device, which is activated when at least one of the gas sensors reaches a preliminary warning level or an alarm level, and records images on the display surface of the image display device thereafter. Since it is recorded, it is extremely useful in clarifying accidents at a later date.

Thus, the first and second inventions according to this invention are
This is a complete change from the conventional gas alarm monitoring system, which uses multiple gas alarms that individually sound a buzzer or flash an indicator lamp, and uses an image display device to perform intensive monitoring. Therefore, it has the excellent advantages of easy monitoring and low fatigue, and is expected to be widely used in the future.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of an embodiment of the first and second inventions according to the present invention, Fig. 2 is a layout diagram showing an example of the arrangement of gas sensors, and Fig. 3 is a bar graph showing the output of each gas sensor. Figure 4 shows an example of when a layout diagram is displayed on the CRT screen when an abnormality occurs, and Figure 5 shows an example of when an abnormality occurs. A diagram showing an example of a case where a message indicating the processing steps to be taken in the event of an occurrence is displayed on the screen of a CRT, FIG. 6 is a front view showing an example of the panel of the device of this invention, and FIG. A diagram of the principle for explanation; Figure 8 is a block diagram showing the measurement of both wind direction and wind force;
FIG. 9 is a diagram showing an example of a method of displaying wind direction and wind force, and FIG. 10 is an external view showing an example of a conventionally used gas leak alarm. In the figure, 1 is a sensor section, 1 ₁ to 1 _o are gas sensors, 2 is a sensor output section, 3 is a scanning section, 4 is a control section, 5 is an operation section, 6 is a wind direction/anemometer, and 7 is a wind speed meter.
CRT, 7A is tube surface, 8 is VTR, 11 is monitoring area, 12, 13 is road, 14 is workbench, 15 is gas equipment, 16 is wind direction indicator mark, 17 is wind force indicator mark, 21 is sensor number, 22 is the 0 level line,
23 is a backup warning line, 24 is a warning line, 25 is a time display section, 30 is a panel surface, 31 is a switch, 32 is a power switch, 33 is a reset switch, 34 is a power indicator light, 35 is a sensor failure lamp, 36 37 is a preliminary warning lamp, 37 is an abnormality warning lamp, and 38 is a buzzer.

Claims (1)

[Scope of Claims] 1. A sensor output section to which outputs from gas sensors arranged at required locations within a monitoring area are applied, a scanning section that sequentially detects each output of the sensor output section, and a scanning section. a control unit that performs graphical processing on each output and timing output obtained from the controller and sets a preliminary alarm level and an alarm level; A gas alarm comprising an image display device that displays a preliminary alarm level and an alarm level on the graphical display.
TV central monitoring system. 2. A sensor output unit to which outputs from gas sensors placed at required locations in the monitoring area are applied, a scanning unit that sequentially detects each output of the sensor output unit, and a sensor output unit that sequentially detects each output from the sensor output unit, and A control unit that performs graphical processing on the clock output and sets a preliminary alarm level and an alarm level; and a control unit that displays the graphically processed outputs and timing outputs of the control unit in bar graphs and numbers, and displays the preliminary alarm level and alarm level. an image display device that displays on the graphical display; and a video recorder that is activated when at least one of the gas sensors reaches a preliminary alarm level or an alarm level and records the output of the control unit to the image display device. A gas alarm TV central monitoring system comprising: