JPH0765267A - Fire alarm device and thermal sensor - Google Patents

Abstract

PURPOSE:To speedily and accurately sense a fire even if the fire breaks out under low-temperature conditions or if a temperature rise due to the fire is slow. CONSTITUTION:The fire alarm device S is equipped with the thermal sensor 1 equipped with a temperature sensor 10 and a receiver 2 which judges whether or not a fire breaks out on the basis of a signal sent from this thermal sensor 1; and the thermal sensor 1 is equipped with a temperature detecting circuit 11 which detects ambient temperature by the temperature sensor 10 and a temperature rise rate detecting circuit 12 which detects the rise rate of the ambient temperature and the receiver 2 performs alarming operation when at least one of data on the detected temperature and data on the temperature rise rate exceed a predetermined specific reference value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire alarm device of the type which judges the presence / absence of a fire based on the measured temperature data measured by a temperature sensor, and an improved heat sensor applied to this fire alarm device. Regarding

[0002]

2. Description of the Related Art Conventionally, there are two types of fire alarm devices using a temperature sensor of this type: a so-called constant temperature type heat sensor and a differential type heat sensor. It is roughly divided into types. The former constant temperature type uses a temperature sensor to detect the ambient temperature, and when this detected temperature exceeds a predetermined reference temperature, it is determined that a fire has occurred at that time and an alarm is issued. . On the other hand, the latter differential type detects the temperature rise rate of the ambient temperature, and when this temperature rise rate exceeds a certain reference value, it is determined that a fire has occurred at that time. .

[0003]

However, in the former constant temperature type of the above-mentioned conventional, a fire occurs under a low ambient temperature (for example, room temperature) of the heat sensor,
When the ambient temperature does not reach a high temperature in a short time, there is a problem that the detection judgment of the occurrence of fire is delayed. On the other hand, in the latter differential type of the above-mentioned conventional, when a fire occurs, a rapid temperature rise is not made, and under the condition where the temperature rise is moderate, it is not possible to accurately detect the fact that a fire has occurred, This was a drawback.

The present invention has been proposed in view of the above points, and even if a fire is generated under low temperature conditions or the temperature rise due to the fire is moderate, these fires can be quickly generated. And to be able to sense accurately,
Its purpose is.

[0005]

According to the present invention, the presence or absence of a fire is judged based on only the detected temperature data or only the temperature rise rate data as in the conventional constant temperature type or differential type fire alarm device. Instead of judging from the above, the existence of a fire is judged based on both of these data, and it is possible to solve the drawbacks of the conventional constant temperature type alone or the differential type only. It was invented in. That is, the present invention according to claim 1 includes a heat sensor including a temperature sensor, and a fire alarm including a receiver that determines whether or not a fire has occurred based on a signal transmitted from the heat sensor. In the device, the heat sensor includes a temperature detection circuit that detects a temperature of an ambient temperature by a temperature sensor, and a temperature increase rate detection circuit that detects a temperature increase rate of the ambient temperature, and the receiver includes Of the data of the detected temperature and the data of the rate of temperature rise, a fire that is configured to perform a warning operation when at least one of the data exceeds a predetermined reference value It is an alarm device.

According to a second aspect of the present invention, a temperature detection circuit for detecting the ambient temperature by a temperature sensor, a temperature rise rate detection circuit for detecting the temperature rise rate of the ambient temperature, and these temperature rise rate detections. A selection circuit that selects one of the data having a larger value among the data detected by the circuit and the temperature detection circuit, and the data selected by this selection circuit is transmitted to the receiver together with the data indicating the type of the data. And a transmitter circuit for controlling the heat sensor.

According to a third aspect of the present invention, there is provided a temperature detection circuit for detecting the ambient temperature by a temperature sensor, and a temperature increase rate detection circuit for detecting the temperature increase rate of the ambient temperature. It is a heat sensor provided with a transmission circuit which distinguishes each data detected by a rise rate detection circuit and a temperature detection circuit, and transmits to a receiver.

[0008]

In the fire alarm device according to the present invention having the above-mentioned structure, the detected temperature data detected by the temperature detection circuit of the heat detector and the temperature rise rate detection circuit are detected. Of both the data of temperature rise rate and the data,
When the data on either side exceeds a predetermined fixed reference value, the receiver judges that a fire has occurred at that time and performs a warning operation. Therefore, even if it takes a long time for the detected temperature value to reach a certain reference value due to fire such as when the ambient temperature of the heat sensor is relatively low, As long as the rate of temperature rise increases, the fact that a fire has occurred can be accurately determined based on the data of the rate of temperature rise, and the notification of fire detection can be promptly issued. Also, unlike this, despite the occurrence of a fire, the ambient temperature does not rise rapidly, and even if the value of the temperature rise rate does not exceed a certain reference value, the ambient temperature rises, As long as the value of the detected temperature reaches a certain reference value, the fact that a fire has occurred is accurately determined and an alarm is issued. As described above, it is possible to quickly and accurately detect the occurrence of a fire regardless of whether the fire occurs under a low temperature condition or a fire condition under which a rapid temperature rise does not occur.

In the heat detector according to the present invention as defined in claim 2, of both data of the detected temperature and the temperature rise rate detected by the temperature detection circuit and the temperature rise rate detection circuit, respectively.
One of the data having the larger value is selected by the selection circuit, and the selected data is transmitted to the receiver together with the data indicating the type of the data. Therefore, in the receiver, it is possible to appropriately determine the presence or absence of a fire by comparing the one type of data on the side with the larger selected value with a predetermined reference value determined in advance according to the type of the data, The same effect as that of the above-mentioned claim 1 is obtained.

In the heat detector according to the third aspect of the present invention, both data of the detected temperature and the temperature rise rate detected by the temperature detection circuit and the temperature rise rate detection circuit are distinguished from each other. Sent to receiver. So at the receiver,
By comparing each of these two types of data with a predetermined reference value determined in advance according to the type, it is possible to appropriately determine whether or not a fire has occurred, and the same action as in the case of claim 1 is obtained. can get.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example of a fire alarm device S according to the present invention. This fire alarm device S includes a heat sensor 1 installed on the ceiling of a house, and the heat sensor 1
And a receiver 2 for receiving signals described below.
The heat sensor 1 and the receiver 2 are wired and connected via the signal line L, but in the present invention, it is also possible to provide a wireless communication means for both of them to eliminate the wiring connection.

Of the above, the heat sensor 1 is a temperature sensor 10 which outputs a signal of an output level corresponding to the ambient temperature,
The temperature detection circuit 11, the temperature rise rate detection circuit 12, the selection circuit 13, and the transmission circuit 14 are provided. Here, the temperature detection circuit 11 uses the temperature sensor 10 to detect the heat sensor 1.
The ambient temperature data D1 is output in the form of, for example, an analog voltage signal. Specifically, the detected temperature and the output signal are as shown in FIG.
When the ambient temperature of the heat sensor 1 is 50 [° C], the temperature detection circuit 11 outputs a signal of voltage 2 [V] as the ambient temperature data D1. It

The temperature rise rate detection circuit 12 includes a temperature sensor 1
0 is used to detect the increase rate of ambient temperature (temperature change per predetermined unit time), and the data D2 of this temperature increase rate can also be output in the form of an analog voltage signal. Specifically, the temperature increase rate and the output signal are set to have a relationship as shown in, for example, FIG.
If the temperature rise rate is 5 [° C / min], the temperature rise rate detection circuit 12 outputs a signal having a voltage of 1 [V] as the temperature rise rate data D2.

The selection circuit 13 selects one of the two types of data, that is, the ambient temperature data D1 and the temperature rise rate data D2, which has the larger value. Specifically, the ambient temperature is 50 [° C], the detected temperature data D1 is 2 [V], and the temperature rise rate is 5 [° C /
When the temperature rise rate data D2 is 1 [V], the former detected temperature data D1 side having a high voltage value is selected. Also, unlike this, data D of the temperature rise rate
If 2 is larger, the temperature increase rate data D2 side is selected.

The transmission circuit 14 has a function of converting the value of the detected temperature data D1 or the temperature increase rate data D2 selected by the selection circuit 13 into a digital signal and then transmitting the data to the receiver 2 side. Have However, in that case,
The data to be transmitted is configured to be transmitted to the receiver 2 side with a data code for identifying whether the data is the ambient temperature data D1 or the temperature increase rate data D2. Has been done. As the data code, for example, "0" is applied to the temperature data D1 and "1" is applied to the temperature rise rate data D2. Further, as the detected temperature data D1 or the temperature increase rate data D2, for example, if the voltage value of the data signal is 2 [V], a value obtained by converting this as a 3-digit digital value of “010” is used. Applied.

The receiver 2 determines from the data code whether the data transmitted from the transmission circuit 14 of the heat detector 1 is the detected temperature data D1 or the temperature increase rate data D2. , The value of the actually received data is compared with a predetermined reference value that is predetermined according to the type of the data, and if the received temperature data exceeds a certain reference value, at that time, for example, It is configured to perform a predetermined alarm operation such as sounding an alarm buzzer or outputting a specific alarm signal. Specifically, for example, with regard to the data D1 of the detected temperature, if the detected temperature exceeds 80 [° C],
[V] When the data corresponding to the signal output above is received from the heat detector 1, it is determined that a fire has occurred. Regarding the temperature rise rate data D2, for example, data corresponding to a signal output of 5 [V] or more when the temperature rise rate exceeds 25 [° C / min] is used.
If it is received from, determine that a fire has occurred.

Next, the operation of the fire alarm device S having the above structure will be described. First, when a fire occurs, the heat detector 1
Detected temperature data D output from the temperature detection circuit 11
As the value of 1 increases, the value of the temperature increase rate data D2 output from the temperature increase rate detection circuit 12 also increases. In such a case, when the temperature inside the room in which the heat detector 1 is installed is low, the ambient temperature of the heat detector 1 does not reach a constant high temperature (for example, 80 [° C]) in a short time. There is. However, even in such a case, since the ambient temperature of the heat detector 1 rises at a constant rate of rise due to the fire, in this case, the temperature rise rate data D2 is more than the detected temperature data D1. Value (that is, the voltage value of the signal) increases, and the selection circuit 13 selects the temperature increase rate data D2. Then, the selected temperature increase rate data D2 is converted into a digital signal by the transmission circuit 14 and then transmitted to the receiver 2 side together with the data code indicating the type.

Therefore, on the receiver 2 side, the value of the temperature rise rate data D2 is set to a predetermined reference value of the temperature rise rate (for example, the temperature rise rate is 25 [° C / min], the output voltage value is 5 [V]), and if it exceeds this reference value, it is determined that a fire has occurred, and a predetermined alarm operation is performed. As a result, even if the ambient temperature of the heat detector 1 has not yet reached the high temperature range of the reference value (for example, 80 [° C]), the fact that a fire has occurred is detected based on the temperature increase rate data D2. It is possible to detect it and to detect a fire early.

Then, unlike the above case, even if a fire occurs, the ambient temperature of the heat detector 1 may not rise rapidly but may rise gradually. In such a case, the temperature increase rate data D2 may be equal to or lower than a predetermined reference value of the temperature increase rate (for example, 25 [° C / min]),
With this, it is not possible to detect that a fire has occurred based on the temperature increase rate data D2. However, even in such a case, the ambient temperature of the heat sensor 1 surely rises, and the selection circuit 13 selects the detected temperature data D1 having a value larger than the temperature rise rate data D2, and this is the transmission circuit. After being converted into a digital signal in 14, it is transmitted to the receiver 2 side together with the code data indicating the type.

Therefore, on the receiver 2 side, the value of the detected temperature data D1 is set to a predetermined reference value of the detected temperature (for example, the detected temperature is 80 [° C] and the output voltage value is 5).
[V]), and if this reference value is exceeded, it is determined that a fire has occurred, and a predetermined warning operation is performed. As a result, it is possible to appropriately detect a fire occurrence, which cannot be detected only based on the temperature increase rate data D2, based on the detected temperature data D1.

In the above embodiment, the selection circuit 13 provided in the heat sensor 1 selects one of the detected temperature data D1 and the temperature increase rate data D2, which has a larger value, to select one type of data. Since only the data is transmitted to the receiver 2 side (corresponding to claim 2), the receiver 2 side only needs to process such one type of data, and the data processing in the receiver 2 can be facilitated. Benefits are obtained. However, the present invention described in claim 1 is not limited to this, and may have a configuration of a fire alarm device Sa as shown in FIG. 3, for example. In this fire alarm device Sa, the heat detector 1a is not provided with the selection circuit 13, and the detected temperature data D1 output from the temperature detection circuit 11 and the temperature increase rate output from the temperature increase rate detection circuit 12 are detected. Both the data D2 of
4a is individually transmitted to the receiver 2a (corresponding to claim 3). Then, in the receiver 2a, each of these two types of data D1 and D2 is compared with a predetermined reference value determined in advance according to the type of the data, and at least one of the data D1 or D2 has a reference value. If it exceeds the limit, the alerting operation is performed at that time. Even with the fire alarm device Sa having such a configuration, similar to the fire alarm device S shown in FIG. 1, the fact that a fire has occurred is detected based on both the detected temperature data D1 and the temperature rise rate data D2. Make accurate decisions.

[0022]

As can be understood from the above description, according to the present invention as set forth in claims 1 to 3, one of the data of both the detected temperature data and the temperature increase rate data is detected. If the data exceeds the specified reference value, it is determined that a fire has occurred.Therefore, a fire occurred when the ambient temperature of the heat sensor was relatively low, and the detected temperature value became a constant reference value. Whether it takes a long time to reach it or the ambient temperature does not rise rapidly in spite of the occurrence of a fire, it is possible to detect the occurrence of a fire appropriately and promptly. As compared with the conventional constant temperature type alone or the differential type only, a remarkable effect that the fire detection performance can be significantly improved can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a hardware configuration of a fire alarm device according to the present invention.

FIG. 2A is an explanatory diagram showing the relationship between the voltage value of the output signal output from the temperature detection circuit and the detected temperature, and FIG. 2B is the voltage value of the output signal output from the temperature rise rate detection circuit. Explanatory drawing which shows the relationship with a temperature rise rate.

FIG. 3 is a block diagram showing another example of the hardware configuration of the fire alarm device according to the present invention.

[Explanation of symbols]

 1, 1a Heat sensor 2, 2a Receiver 10 Temperature sensor 11 Temperature detection circuit 12 Temperature rise rate detection circuit 13 Selection circuit 14, 14a Transmission circuit S, Sa Fire alarm device

Claims (3)

[Claims] 1. A fire alarm device comprising: a heat sensor having a temperature sensor; and a receiver for judging whether or not a fire has occurred based on a signal transmitted from the heat sensor. The sensor includes a temperature detection circuit that detects the ambient temperature with a temperature sensor and a temperature increase rate detection circuit that detects the temperature increase rate of the ambient temperature. A fire alarm device characterized by being configured to perform an alarming operation when at least one of the data of the rate of increase and the data of at least one of the data exceeds a predetermined reference value. . 2. A temperature detection circuit for detecting an ambient temperature by a temperature sensor, a temperature rise rate detection circuit for detecting a temperature rise rate of the ambient temperature, and a temperature rise rate detection circuit and a temperature detection circuit, respectively. It comprises a selection circuit for selecting one of the detected data having a larger value and a transmission circuit for transmitting the data selected by the selection circuit together with the data indicating the type of the data to the receiver. A heat sensor characterized by being present. 3. A temperature detection circuit for detecting an ambient temperature by a temperature sensor, and a temperature rise rate detection circuit for detecting a temperature rise rate of the ambient temperature. The temperature rise rate detection circuit and the temperature detection circuit. And a transmitter circuit that distinguishes each data detected in step 1 and transmits to the receiver.