JPH11339144A - Thermal sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a thermal sensor capable of confirming a temperature that is now being detected and to prevent a malfunction by notifying a user of an ambient temperature that was detected at that time when an operating means was operated to confirm the ambient temperature. SOLUTION: When an operating means such as a push button is operated, an ambient temperature can be confirmed. When an operation confirmation circuit 2 detects an operation of the operating means, a microcomputer 1 notifys of the ambient temperature detected at that time through a signaling means. The notifying means here notifys of a temperature so that it can be confirmed with the sense of sight and hearing and here, the signaling means consists of a detected temperature display circuit 3 and a warning circuit 4. The microcomputer 1 compares a voltage value that is inputted by a fire deciding part 10 with a preliminarily defined fire decision level and when the voltage value exceeds the fire decision level, it outputs an alarm through the circuit 4 at the time of a normal fire monitoring. Thus, a false report due to detecting an incorrect temperature is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat detector capable of confirming a current detected temperature.

[0002]

2. Description of the Related Art FIG. 5 is an external view showing an example of a residential heat sensor. The heat detector S always detects the ambient temperature by a thermistor TH as a heat detecting element. When the detected temperature exceeds a predetermined fire determination level, an alarm buzzer sounds from the speaker SP. The occurrence of a fire is notified by turning on or blinking an LED (not shown).

The heat sensor S is provided with a push button 100 for checking the operation and a drawstring 101. When the pushbutton 100 is pressed or the drawstring 101 is pulled, the alarm buzzer is forcibly activated. It is possible to check whether the heat detector S is operating normally by checking whether or not the thermistor TH is disconnected.

[0004]

As described above, the operation of the heat sensor can be confirmed. However, since the ambient temperature currently detected cannot be confirmed, the thermistor and its peripheral circuits are not detected. Have deteriorated and their characteristics have changed, an erroneous temperature has been detected, and an alarm may have been output erroneously.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has as its object to provide a heat sensor capable of confirming the temperature currently being detected and preventing malfunction. I have.

[0006]

In order to achieve the above object, a heat sensor according to claim 1 of the present invention is provided with operating means for operating to check the ambient temperature, and when the operating means is operated. And a notifying means for notifying the ambient temperature detected at that time. Here, the operating means is constituted by a push button, a switch, a drawstring or the like, and the notifying means is constituted so that the temperature can be confirmed visually or audibly.

According to a second aspect of the present invention, the notification means of the first aspect is a display means for displaying an ambient temperature. Here, the display means includes one or a plurality of LEDs, an LED dot matrix, a 7-segment display, a liquid crystal display, and the like. According to the third aspect, the alarm means of the first aspect is an alarm means for outputting an alarm sound when it is determined that a fire has occurred, and changes the output time of the alarm sound or the number of times the alarm sound is output according to the ambient temperature. It is characterized by making it.

According to a fourth aspect of the present invention, the notifying means of the first aspect is an alarming means for outputting an alarm by a voice message when the occurrence of a fire is determined, and outputs the ambient temperature by a voice message.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example of the configuration of the heat detector. This heat detector S
A microcomputer 1 for controlling each part, an operation confirmation circuit 2 for accepting operations such as a push button or a string as an operation means and confirming the operation of the detector S, and detecting operation based on a control signal from the microcomputer 1 at the time of operation confirmation It comprises a detected temperature display circuit 3 for displaying temperature, a buzzer, an LED, and the like. When the microcomputer 1 determines a fire or detects a failure of the sensor S, an alarm is displayed or an alarm sounds to indicate that a fire has occurred. An alarm circuit 4 for notifying and a power supply circuit 5 for supplying power to each unit using a battery or AC100V as a power supply are provided.

The microcomputer 1 includes a fire determination unit 11 for determining the occurrence of a fire based on a change in the voltage input by being divided by the thermistor TH and the resistor R, and a control circuit unit 11 for controlling each unit. And a timer circuit section 12 for measuring the duration of outputting an alarm sound. Microcomputer 1
During normal fire monitoring, the fire determination unit 10 compares the input voltage value with a predetermined fire determination level,
When the voltage value exceeds the fire judgment level, an alarm circuit 4
Causes an alarm to be output.

In the present invention, when operating means such as a push button is operated, the ambient temperature can be confirmed. When the operation check circuit 2 detects the operation of the operation unit, the microcomputer 1 notifies the ambient temperature detected at that time by the notification unit. Here, the notification means is for notifying the temperature so that it can be confirmed visually or audibly,
Here, the detected temperature display circuit 3 and the alarm circuit 4 constitute a notification unit. It is not necessary to provide both of them, and only one of them may be provided.

The detected temperature display circuit 3 has, for example, a circuit configuration as shown in FIG. 2 and includes a plurality of LEDs, and the LED which is turned on or blinks changes according to a change in temperature. In this figure, four LEDs (LE
D1 to LED 4), and the microcomputer 1 can detect the port A if the detected temperature is 0 ° C. or more and less than 10 ° C.
Is set to the H level, the transistor TR1 is turned on, and LE
D1 is turned on. In addition, the detection temperature is 10 ° C or more and 20 ° C
If it is less, the port B is set to the H level, the transistor TR2 is turned on, and the LED2 is turned on. Further, if the detected temperature is 20 ° C. or more and less than 30 ° C., the port C is set to the H level, the transistor TR3 is turned on, and the LED 3 is turned on. If the detected temperature is 30 ° C. or more and less than 40 ° C.
The port D is set to the H level, the transistor TR4 is turned on, and the LED4 is turned on.

Note that the detected temperature display circuit 3 is not limited to providing four LEDs 1 to 4 as shown in the figure, but the number of LEDs may be increased more than that, and a finer unit (for example, 5 ° C.) The temperature may be displayed in increments. Alternatively, only one LED may be provided to display the temperature by the number of blinks. In this case, the microcomputer 1 outputs a number of pulses corresponding to the temperature from the port. For example, the LED may blink once in 5 ° C. units.

The ambient temperature is not limited to being displayed on one or several LEDs, but may be displayed on an LED dot matrix, a seven-segment display, a liquid crystal display, or the like. In this case, since the temperature value can be displayed by a number, the recognition becomes easier. When the temperature is displayed as described above, the operator compares it with the temperature detected using another thermometer, and confirms whether the heat sensor S has correctly detected the temperature. As a result, it is possible to prevent a false report caused by detecting a wrong temperature. In addition, the heat sensor S can be used as a simple thermometer during a period in which it is confirmed that the temperature is correctly detected.

FIG. 3 shows the appearance of the heat detector S. The heat detector S is provided with a thermistor TH as a heat detection element. If the temperature detected by the thermistor TH exceeds the fire determination level, the alarm circuit 4 turns on the speaker SP.
Output an alarm sound and an alarm message. When the push button 20 is pressed or the pull cord 21 is pulled, the ambient temperature detected by the thermistor TH is displayed by the LEDs 1 to 4 of the detected temperature display circuit 3. In the figure, the LED 3 is lit, indicating that the ambient temperature is 20 ° C. or more and less than 30 ° C.

Next, notification of the ambient temperature by the alarm circuit 4 will be described. The alarm circuit 4 normally sounds an alarm sound (alarm buzzer) when the fire determination unit 10 of the microcomputer 1 determines that a fire has occurred. The temperature is notified by changing the output time of the alarm sound or the number of times the alarm sound is output.

FIG. 4 is a time chart showing the method. FIG. 4A shows a case where the output time of the alarm sound is changed according to the temperature, and FIG. 4B shows a case where the number of times the alarm sound is output is changed according to the temperature. Here, the temperature is divided into four stages, and the output time is set to T (for example, 5 seconds) and 2T.
(10 seconds), 3T (15 seconds), 4T (20 seconds), or output once (), twice (,),
The number of times (,,) and the number of times (,,,) are four, but the present invention is not limited to this.

If the alarm circuit 4 outputs a warning by voice message when a fire is determined, the ambient temperature can be output by voice message. For example, a message such as “25 ° C.” is output. When the configuration is such that the voice message can be freely output, the temperature to be notified does not need to be divided into a plurality of stages, and the temperature as detected can be notified.

[0019]

As can be understood from the above description, the heat sensor according to any one of claims 1 to 4 of the present invention notifies the detected ambient temperature when the operation of confirming the ambient temperature is performed. . Therefore, it is possible to confirm that the heat detecting element and its peripheral circuits have not deteriorated, and it is possible to prevent a false report due to detecting an incorrect temperature. Further, this heat sensor can be used as a simple thermometer.

In particular, in the present invention, since the ambient temperature is displayed, the operation can be reliably performed by visual confirmation. According to the third aspect of the present invention, an alarm sound that is output when a fire is determined is used to check the ambient temperature. Therefore, it is not necessary to provide a new circuit only for temperature notification, and an extra There is no cost. Further, since the voice message output when the occurrence of a fire is determined is used to check the ambient temperature, more detailed ambient temperature can be reported.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of an internal configuration of a heat detector.

FIG. 2 is a circuit diagram showing an example of a detected temperature display circuit.

FIG. 3 is an external view showing an example of the structure of a heat detector.

FIG. 4 is a time chart showing an example of notification of an ambient temperature by an alarm circuit.

FIG. 5 is an external view showing an example of the structure of a conventional heat sensor.

[Explanation of symbols]

 S Heat detector 1 Microcomputer 2 Operation check circuit 3 Detected temperature display circuit 4 Alarm circuit TH Thermistor 20 Push button 21 String

Claims (4)

[Claims] 1. A heat detector for judging occurrence of a fire on the basis of an ambient temperature to be detected, comprising: operating means for operating to confirm the ambient temperature; and detecting when the operating means is operated. And a notifying means for notifying the detected ambient temperature. 2. The heat sensor according to claim 1, wherein said notification means is display means for displaying an ambient temperature. 3. The alarm means outputs an alarm sound when it is determined that a fire has occurred, and changes the output time of the alarm sound or the number of times the alarm sound is output according to the ambient temperature. The heat sensor according to claim 1, wherein 4. The alarm means is an alarm means for outputting an alarm by voice message when it is determined that a fire has occurred,
The heat sensor according to claim 1, wherein the ambient temperature is output as a voice message.