JPH03260711A - Heater controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to heating control equipment, and in particular, to heating control equipment,
The present invention relates to a method suitable for detecting an abnormality in a heater when the temperature rises.

[Conventional technology]

Conventional devices are provided with a heater abnormality detection function during normal operation, but are not provided with a function to detect heater abnormality during temperature rise.

Note that related devices of this type include, for example,
JP-A-50-18309 is mentioned.

[Problem to be solved by the invention]

FIG. 3 shows the relationship between the temperature of the device and the inclusions in the device in a conventional system and various set values. Further, FIG. 4 shows a conventional alarm control circuit.

The conventional alarm control shown in FIG. 4 compares the temperature of the device and its contents with a temperature alarm set value, and if the temperature of the device and its contents deviates from the temperature alarm set value, A warning had been issued.

Therefore, as shown in the relationship between the temperature of the device and the inclusions in the conventional system in Figure 3, after the temperature increase command is output, the temperature of the device and the inclusions in the device exceeds the temperature alarm set value. It is not possible to detect an abnormality in the heater until the

In other words, the alarm control circuit shown in Fig. 4 does not issue an alarm when a temperature increase command is output and the temperature exceeds the low temperature alarm set value (during normal operation); In order to prevent this, the operator should adjust the temperature alarm setting while monitoring the temperature of the equipment and the contents inside the equipment. There was a problem that adjustments had to be made manually.

An object of the present invention is to detect an abnormality in a heater during temperature rise, alert the operator to the abnormality, and reduce the burden on the operator.

[Means to solve the problem]

The above purpose is to predict the temperature change of the device and the inclusions in the device based on the ambient temperature, heater power consumption, amount of inclusions in the device, amount of inclusions flowing into the device, and inflow temperature, and based on the predicted values, Calculate the high and low temperature alarm set values for each time, compare the actual measured value with the high and low temperature alarm set values at each time, and output an alarm if the actual measured value deviates from the alarm set value. This is achieved by

[Effect]

The temperature of the device and the inclusions in the device can be predicted based on the power consumption of the heater, the ambient temperature, the amount of inclusions in the device, the amount of inclusions flowing into the device, and the inflow temperature.

Therefore, based on the predicted temperature rise value predicted from the heater power consumption, ambient temperature, amount of inclusions in the device, amount of inclusions flowing into the device, and inflow temperature, high and low temperature alarm settings are determined.
By comparing this alarm set value and the actual temperature every time, and issuing an alarm when the actual measured value deviates from the alarm set value, it is possible to detect a heater abnormality when the temperature rises.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. In the figure, 1 is a heater, 2 is a temperature detector, 3 is a temperature change prediction calculation circuit, 4 is a temperature high and low alarm setting circuit, 5 is a comparator, 6 is a liquid level detector, 7 is a flow rate detector, 8 is an inflow temperature detector.

The temperature detector 2 detects the temperature of the device and the inclusions within the device and inputs the detected temperature to the comparator 5. The comparator 5 reads the temperature high and low alarm set values from the alarm setting circuit 4 at regular intervals, compares them with the temperature from the temperature detector 2, and determines whether the actual measured value deviates from the temperature high or low alarm set values. If the temperature is high or low, an alarm will be output. In addition, the temperature change prediction calculation circuit 3
Then, the heater power consumption, the ambient temperature, the liquid level of inclusions in the device which is the output of the liquid level detector 6, the amount of inclusions flowing into the device which is the output of the flow rate detector 7, and the output of the inflow temperature detector 8. Based on a certain inflow temperature, a predicted temperature rise value is output with a heater control start command, and when the actual measured value reaches the rated temperature, the normal operation temperature is output to the alarm setting circuit 4. An alarm set value is output to the comparator 5 based on the predicted value.

FIG. 2 shows the relationship between the temperature of the device and the contents inside the device and various set values. As is clear from the figure, after the heater control command is output, the temperature alarm set value increases, and when the rated temperature is reached, the alarm set value for normal operation is output.

In the present invention, when the heater is normal, the temperature of the device and the contents within the device does not deviate from the alarm set value, so no false alarm is issued.

〔Effect of the invention〕

According to the present invention, it is possible to detect an abnormality in the heater when the temperature is rising, and to notify the operator of the abnormality, thereby reducing the burden on the operator.

[Brief explanation of drawings]

FIG. 1 is a heating control block diagram of an embodiment of the present invention, and FIG.
The figure is an explanatory diagram of the device of the present invention and the temperature of the inclusions in the device and various set values, FIG. 3 is an explanatory diagram of the conventional device and the temperature of the inclusions in the device and various set values, and FIG. is a conventional alarm control circuit diagram. 1... Heater, 2... Temperature detector, 3 - Temperature change prediction calculation circuit, 4... Alarm setting circuit, 5 - Comparator, 6... Liquid level detector, 7... Flow rate Detector, 8...
Inflow temperature detector 59... Alarm set value. Figure 1 Figure 3 Dark room Figure 2 Ama Figure 4

Claims (1)

[Scope of Claims] 1. A heating control device that heats the device and the inclusions in the device using a heater and maintains the temperature of the device and the inclusions in the device at a predetermined value, comprising: a circuit that predicts a temperature change of the inclusions in the device; a circuit that outputs an alarm value for each hour based on the predicted temperature value in the circuit; and detection of the temperature of the device and the inclusions in the device. What is claimed is: 1. A heater control device comprising: a circuit, a comparison circuit for signals from each of the alarm value output circuit and the temperature detection circuit, and detects an abnormality in the heater.