JPH01114665A - Control device for warm air flow heater - Google Patents

Abstract

PURPOSE:To prevent the main body of a heater from starting even when an operation switch is turned ON if a seismoscope is under a cut OFF state by stopping the operation of a warm wind heater even when the operation switch is turned on in the case of the seismoscope which is switched off. CONSTITUTION:When a seismoscope 5 operates and shuts down a circuit, the supply of electric power to a self retention coil 4a is cut OFF and the self retention output voltage is reduced to 0. The power supply to a load relay 13 is also shut down, thereby bringing the operation of a loading unit to a stop. When a pushbutton switch 1b of an operation switch 1 is depressed due to some cause, self retention output voltage passing through the switch is supplied to a load relay 13. In this case, however, the self retention out voltage is applied to a signal line 11, which turns the voltage to a high level. A microcomputer 12 judges this as an abnormal state and turns a signal line 16 into a low level and cuts off the load relay 13, which prevents the loading unit from starting the operation.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a control for a hot air heater that can reliably stop the operation of the hot air heater when a seismic sensor detects vibration and operates. It is related to the device.

[Prior Art] FIG. 2 is a circuit diagram showing a conventional hot air heater control device and its peripheral circuits. In the figure, (1) is an operation switch, which consists of a main switch (1a) and a push switch (1b).

In addition, (2) and (3) are when the operation switch (1) is turned on/off.
Voltage dividing resistor to take out the signal about OFF, (4)
is a self-holding relay, which consists of a self-holding coil (4a) and a self-holding switch (4b). (5) is a seismic sensor, (6) and (7) are voltage dividing resistors for extracting the self-holding circuit output voltage by turning on and off the self-holding switch (4b), and (8) is for smoothing the output voltage. (9) is a signal line for taking out a signal for turning on/off the operation switch (1), and (10) is a signal line for taking out an output voltage. And these signal lines (9),
(10) are microcomputers (12
)It is connected to the.

Furthermore, (13) is a load relay for controlling the operation and stop of the heater main body, which is a load device, and is composed of a load coil (13a) and a load switch (13b). In addition, (14) is the load power supply which is the power supply of the heater main body, (
15) is a load motor, and (16) is a signal line for supplying a signal from the microcomputer (12) to the load relay (13).

Next, the operation of such a conventional heater control device will be explained.

When the operation switch (1) is turned on, the main switch (
Both 1a) and the push switch (1b) are turned on and current flows through the main switch (1a) and the push switch (1b) to the self-holding coil (4a) of the self-holding relay (4).

This causes the self-holding switch (4b) to operate and turn on the self-holding switch (4b). Then, when the push switch (1) is released, the push switch (1) is released.
Only b) is turned off. However, in this state, since the self-holding switch (4b) is on, current continues to flow through the circuit, and a self-holding circuit output voltage is generated.

This output voltage is then supplied to the microcomputer (12) via a signal line (10).

The microcomputer (12) turns on the load relay (13) via the signal line (16), so the load motor (1
5) receives power from the load power source (14) and rotates. In this way, the heater main body, which is a load device, is operated.

Here, when the seismic sensor (5) operates and the current to the circuit passing through the seismic sensor (5) is cut off, the current to the self-holding coil (4a) is cut off, and the self-holding switch (4b) is turned off. As a result, the output voltage becomes 0, and the signal line (10
) to the microcomputer (12) also becomes a low level signal. Microcomputer (1
2) responds to this signal by sensing vibrations (5) to extinguish the fire through activation, that is, to stop the operation of the heater body.

[Problems to be Solved by the Invention] Since the conventional hot air heater control device is configured as described above, even when the seismic sensor (5) is cut off, the operation switch ( 1) is pressed down, that is, when the push switch (1b) of the operation switch (1) is turned on, the operation switch (1)
The current flows through the voltage dividing resistors (6) and (7). Therefore, there was a problem in that the output voltage supplied to the signal line (10) was at a high level, and the microcomputer (12) started operating the heater body.

This invention was made to solve the above-mentioned problems, and even if the operation switch (1) is turned on with the seismic sensor (5) turned off, the main body of the heater starts to collapse. The purpose of the present invention is to obtain a control device for a hot air heater without any

[Means for solving the problem] A control device for a hot air heater according to the present invention connects a main switch to a power source, connects one end of a push switch and a self-holding switch to the other end of the main switch, A self-holding coil is connected to the other ends of these push switches and the self-holding switch, and a seismic switch is connected to the other end of this self-holding coil, and a signal from the connection between the self-holding coil and the seismic switch and the main A signal indicating whether the switch is on or not is sent to the microcomputer, and the microcomputer uses two input signals to control the seismic switch to stop operation if it is off.

[Function] In the hot air heater control device according to the present invention, when the main switch and the push switch are turned on, current flows through the self-holding coil. When current flows through this self-holding coil, the self-holding switch is turned on. When the push switch is off and the main switch is on, the potential at the connection between the self-holding coil and the seismic switch is at a low level. Then, since a signal indicating that the main switch is turned on is input, the microcomputer controls the heater to operate. Here, if the seismic switch is cut off in the normal state where the main switch is on and the push switch is off, the power to the self-holding coil is cut off and the self-holding switch is turned off. Therefore, the self-holding output voltage is no longer applied to the load coil of the load relay, the load relay is cut off, and the operation of the heater is stopped. In this state, if the push switch of the operation switch is pressed down,
Current continues to flow through the push switch. However, the potential of the signal line at this time becomes high level. Therefore, the microcomputer detects that the signal from the signal line has changed to a high level and shuts off the relay from the signal line.

As described above, the hot air heater control device according to the present invention can prevent the heater from operating in a state where the ffW is turned off using the microcomputer.

[Example] Hereinafter, one embodiment of the present invention will be described based on the drawings.

In Fig. 1, (1) is the operation switch, which consists of a main switch (1a) and a push switch (1b), and (2) and (3) are the on/off switches for operation switch (1).
A voltage dividing resistor (4) is a self-holding relay for transmitting a signal about OFF to the microcomputer (12), and a self-holding coil (4a) and a self-holding switch (4)
b), (5) is a seismic sensor, (6), (
7) is a voltage dividing resistor for sending the output voltage of the self-holding circuit to the microcomputer (12), (8) a capacitor for smoothing the output voltage, and (9) is a voltage dividing resistor for sending the output voltage of the self-holding circuit to the microcomputer (12). signal line that transmits to
(11) is a signal line that conveys the status of the seismic sensor (5) to the microcomputer (12), (13) is a load relay, (1
4) is a load power supply, (15) is a load motor, and (1B) is a signal line for sending signals from the microcomputer (12) to the load device.

Next, the operation of the apparatus of this embodiment will be explained. 1st
In the figure, the main switch (1) of the operation switch (1)
When both a) and the push switch (1b) are closed, the self-holding coil (4a) of the self-holding relay (4) is energized, and the 0 self-holding switch (4b) is turned on. On the other hand, signals for on/off of the operation switch (1), which are voltage-divided by the voltage-dividing resistors (2) and (3), are transferred to the microcomputer (12) through the signal line (9). That is, the signal from this signal line (9) causes the microcomputer (12
) can know the on/off state of the operation switch (1). Further, by turning on the self-holding relay (4), a self-holding output voltage is applied to the load relay (13). Furthermore, since the connection point between the self-holding coil (4a) and the seismic sensor (5) is at the same potential as the ground side, the signal line (
11), a low level signal is input to the microcomputer (12). Therefore, the microcomputer (12) outputs a high level signal to the signal line (16) under the condition that the signal from the signal line (9) is high level and the signal from the signal line (11) is low level, and the load relay ( 13
) on. This allows the load motor (1
5) is supplied with power and starts operating.

In this way, when the seismic sensor (5) operates during normal operation and interrupts this circuit, the power to the self-holding coil (4a) is cut off, thereby causing the self-holding switch (4b) is turned off. Therefore, the self-holding output voltage becomes 0, the power supply to the load relay (13) is also cut off, and the operation of the load device is stopped. If the push switch (1b) of the operation switch (1) is pressed down for some reason while the seismic sensor (5) is cut off, the self-holding output voltage will be transmitted through this,
It is supplied to the load relay (13). However, in this case, since a self-holding output voltage is applied to the signal line (11), it becomes high level. That is, a microcomputer (12
), both signals from the signal line (9) and the signal line (11) are at high level. Therefore, the microcomputer (12) determines this to be an abnormal state, and the signal line (
16) is set to low level, and the load relay (13) is cut off. Therefore, the load device is never operated.

[Effects of the Invention] As described in Part 2, according to the present invention, since the output level of the voltage signal to the seismic sensor is processed by a microcomputer, operation can be started with the seismic sensor turned off. This improves the safety of the hot air heater.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a control device for a hot air heater according to an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional control device for a hot air heater. In the figure, (1) is the operation switch, (la) is the main switch, (lb) is the push switch, (4) is the self-holding relay, (4a) is the self-holding coil, (4b) is the self-holding switch, (5) ) is a seismic sensor, and (12) is a microcomputer. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] (1) An operation switch that is connected to the power supply at one end and consists of a main switch that turns on and off the power supply from this switch, and a push switch that is connected in series with this switch and is turned on only when the operation starts; A self-holding relay consisting of a self-holding coil and a self-holding switch driven by the self-holding coil and connected in parallel to the push switch, a seismic switch connected in series to the self-holding coil, and an on/off switch for the main switch. It has a means for detecting the state, a means for detecting the potential of the connection between the self-holding coil and the seismic switch, and a microcomputer that receives signals from these two detecting means and controls the operation of the hot air heater. A control device for a hot-air heater, characterized in that, when the seismic switch is off, the hot-air heater is controlled to stop operating even if the operation switch is on.