JPS6346328B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a digital temperature control device for a combustor for controlling the operation of a combustion control device so as to maintain the temperature of a heat demand source at a predetermined value.

In order to safely control the combustor in a boiler, etc., it is necessary to regularly inspect elements such as igniters and valves, and perform thorough maintenance such as replacing worn parts. . For this reason, periodic inspections are generally performed, but the wear and tear of parts depends on the number of times the combustor starts and stops, not the period of use, so if the frequency of starts and stops is extremely high,
There is a risk of failure before the inspection date.

In addition to the function of controlling the temperature of the heated part, this invention has a function of counting and displaying the number of times the combustor starts and stops, making it possible to accurately notify when maintenance is required. The purpose of the present invention is to provide a digital temperature control device for a combustor.

An embodiment of the present invention will be described below with reference to the drawings. On the front of the front panel 1 shown in FIG. 1, in this example, a digital display 2 consisting of a 7-segment display element with two digits, nine display lamps 3, four push buttons 4a to 4d, an operation switch 5, and two display lamps 6 for identifying display contents.
is located. In addition, the digital display 2 has
An indicator lamp 7 is provided which indicates that there is a fraction of 0.5 when lit. Note that the term "display lamp" refers to optical display elements such as light emitting diodes in general.

FIG. 2 shows the configuration of the digital temperature control device shown in FIG. 1. Microprocessor 11
has a CPU 12, and a RAM 13 and a ROM 14 are connected to this CPU 12. Further, a temperature signal obtained from a temperature detection end shown as a thermistor TH is converted into a digital signal by an A/D converter 15 and then input to the CPU 12. On the other hand, the input switch 16 consisting of the push buttons 4a to 4d and the operation switch 5 is used to give a desired command to the CPU 12, and the output according to this command is
The digital display 2 and display lamps 3, 6,
7 is displayed.

In this example, each of the display lamps 3 has "V1
"Off", "V1 On", "V2 Off", "V2 On",
"H/L Off", "Freezing On", "Number of Times", "Current Number of Times", and "Current Temperature" are given to indicate what the numerical values displayed on the digital display 2 mean. This display mode switching is performed sequentially each time the push button 4a labeled "Step" is pressed, and when a mode that requires setting is selected, the push button 4a labeled "Up" is pressed.
b, or pushbutton 4c labeled "down"
By pressing , it is possible to arbitrarily change the numerical value displayed on the digital display 2, and when the desired numerical value is displayed, press the push button 4d labeled "Memory". When the number is displayed, the displayed value is written to the RAM 13. In this example, the combustor valve V
1.It is configured so that the on and off temperatures of V2, the off temperature of high limit switch H/L, the on temperature of anti-freeze switch, and the number of times valve V1 is turned on can be set, and when either valve V1 or V2 is turned on, The number of times the number of times the number of times the number of times the number of times has reached the number of times the number of times the number of times the number of times the number of times has reached the number of times the number of times the number of times the number of times the number of times the number of times has reached the number of times the number of times the number of times the number of times the number of times the number of times has exceeded the number of times the number of times the number of times the number of times the number of times the number of times the number of times has exceeded is stored is stored in the RAM 13 .

Furthermore, the CPU 12 causes the digital display 2 to flash (blink in short cycles) since the set values have not been written to the RAM 13 immediately after the main power is turned on when the device is started to be used. Notifies you that you need to perform a setting operation. A similar situation also occurs when there is a temporary power outage during use. In this case, RAM13
The setting data written in the ROM 14 will be lost, but at the same time as the power is restored, the CPU 12 will read out the contents of the ROM 14 and supply control signals to the combustor based on this data. The data written in advance in the ROM 14 is suitable for safely operating the combustor until the predetermined setting data is written in the RAM 13, and this changes the operation of the combustor. Various inconveniences caused by the stoppage can be avoided. Also, if two or more types of data are written in the ROM 14 so that the optimal data can be selected according to conditions such as the combustor rating, it is advantageous in that the same model can be applied to many types of combustors. It is.

Next, the operation will be explained according to the flowchart shown in FIG. At the same time as the start by turning on the power, all the memory contents of the RAM 13 are first cleared, and then the step switch is turned on by the push button 4a to set the off point of the valve V1. In this setting operation, as described above, push the pushbutton 4b or 4c to set the value displayed on the digital display 2 so that it is the desired off point, and then press the pushbutton 4d to set this value.
It is completed by writing to RAM13. When it is confirmed that the newly set V1 off point value is within the appropriate range, push button 4a is pressed to proceed to the next V1 on point setting operation. If the value is incorrect, such as higher than the temperature, the display on the digital display 2 is flashed to notify that the set value is incorrect, and the selection mode is switched and a prohibition operation is performed. Similar setting operations are performed sequentially for the V1 on point, V2 on point, H/L off point, freeze on point, and number of valve operations. On the other hand, the number of pushbuttons 4a necessary for performing setting operations is 1.
If the button is not pressed once, the fixed setting value previously written in the ROM 14 is used.

Next, when the operation switch 5 is turned on, it is checked whether there is a burnout in the thermistor TH and whether there is a heat demand, and then a signal to ignite the burners v1 and v2 is output. . This causes the combustor to enter a normal combustion state, and at the same time a count signal is supplied to a counter that counts the number of operations. Therefore, if the temperature detected by the thermistor TH is, for example, 25°C, if the current count display mode is selected by operating the pushbutton 4a, "1" will be displayed on the digital display 2, and the current temperature will be displayed. If you select the mode, "25" will be displayed.

Both valves V1 and V2 of the combustor are open while the water temperature of the boiler is low to supply fuel to the burner at the maximum flow rate. ), valve V1 closes, the fuel supply flow rate decreases, and the second
It is assumed that the valve V2 is used in such a manner that the valve V2 also closes when the V2 off point (for example, 80° C.), which is the set temperature of the valve V2, is reached. Therefore the thermistor
When the detected temperature of TH reaches the V1 off point, CPU1
2 generates the V1 off signal and then generates the V2 off signal when the V2 off point is reached. Also, if the detected temperature drops in this state, the V2 on signal or V
1. The operation to generate the V2 ON signal and maintain the boiler water temperature at the set value is automatically performed. Additionally, if the water temperature of the boiler abnormally rises to the H/L off point for some reason, the CPU 12 will issue an emergency stop signal and valves V1 and V2 will be turned off instantly, and at the same time a predetermined failure indication will appear on the digital display 2. It will be done. This operation is similarly performed when burnout occurs due to disconnection of the thermistor TH.

On the other hand, the CPU 12 counts the V1 and V2 on signals every time they are emitted, and controls the push button 4a.
When the current count display mode is selected by the operation, this count value is displayed on the digital display 2. When the count of the number of starts and stops reaches a preset number in the above-described operation, the display on the digital display 2 is made to flash. This will clearly notify you that maintenance is required.

As described above, according to the present invention, the number of times the combustor starts and stops is counted, and a predetermined display is displayed when this number reaches a set value, so that maintenance is not required due to the passage of time. Notifications will be made based on the number of starts and stops. Therefore, maintenance can be performed before malfunctions occur due to excessive wear and tear of parts, and the safety and reliability of the combustor can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a front view of the panel surface of a digital temperature control device according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of the device, and FIG. 3 is a flowchart thereof. 1...Front panel, 2...Digital display, 3
...Display lamp, 4a-4d...Push button, 5...Operation switch, 6, 7...Display lamp, 11...Microprocessor, 12...CPU, 13...RAM, 14...
ROM, 15...A/D converter, 16...input switch, TH...thermistor.

Claims (1)

[Claims] 1. The combustor for heating the heated part is controlled by a signal from the microprocessor so that the temperature setting value written in the memory matches the detected temperature of the heated part. What is claimed is: 1. A digital temperature control device for a combustor, characterized in that the device is configured to start and stop the combustor and display the number of times the combustor starts and stops on a digital display. 2. The digital temperature control device for a combustor according to claim 1, wherein either the detected temperature or the number of starts/stops is displayed on the digital display by switching a switch. 3. The digital temperature control device for a combustor according to claim 1, wherein the display contents of the digital display are flashed when the number of times of starting and stopping reaches a preset number.