JP2009069952A - Heat sensor and fire alarm using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat sensor capable of immediately detecting that an external temperature becomes a prescribed temperature or above, and to provide a fire alarm using it. <P>SOLUTION: This heat sensor has: a tube body 101 provided with a lid part 101a on one end side; and a detection signal output part 102 provided in a cavity part of the tube body 101, outputting a detection signal when a contact 102a with the lid part 101a turns off based on thermal expansion of the tube body 101 when the external temperature becomes the prescribed temperature (e.g. 60°C) or above. Thereby, external air heat can be directly conducted to the tube body 101, and the thermal expansion or contraction of the tube body 101 accompanying a change of the external temperature can be rapidly performed. Accordingly, it can be immediately detected that the external temperature becomes the prescribed temperature or above, and detection accuracy of indoor occurrence of a fire, or the like, for example, can be improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat detector capable of detecting, for example, that an indoor temperature has become equal to or higher than a predetermined temperature, and a fire alarm using the same.

  Conventionally, as a heat detector of this type, when a thermal expansion member and a contact point are turned on or off based on thermal expansion or contraction of the thermal expansion member when the external temperature exceeds a predetermined temperature, a predetermined detection signal is output. What is provided with the detection signal output part to output is known.

In this thermal sensor, a thermal expansion member is accommodated in a housing having thermal conductivity, and is thermally expanded or contracted based on external air heat transmitted through the housing.
No. 7-35267

  However, in the conventional example, since the thermal expansion member is accommodated in the housing, even when the external temperature reaches a predetermined temperature, the time until the contact is turned on or off depends on the thermal conductivity of the housing. It became long and it was difficult to immediately detect that the external temperature was higher than a predetermined temperature.

  The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to use a heat detector capable of immediately detecting that the external temperature has become equal to or higher than a predetermined temperature, and the heat detector. It is to provide a fire alarm.

  In order to achieve the above object, the heat sensor of the present invention is provided in a cylindrical thermal expansion member having a lid on one end side and a hollow portion of the thermal expansion member, and the external temperature is equal to or higher than a predetermined temperature. And a detection signal output unit that outputs a predetermined detection signal when the contact with the lid is turned on or off based on thermal expansion or contraction of the thermal expansion member.

  In order to achieve the above object, the fire alarm device of the present invention includes the heat sensor and an alarm information output unit that outputs predetermined alarm information when a detection signal is input from the heat sensor. ing.

  As a result, the cylindrical thermal expansion member is provided in an exposed state, and a detection signal output unit that outputs a predetermined detection signal when the external temperature becomes equal to or higher than the predetermined temperature is provided in the hollow portion of the thermal expansion member. Since it is provided, external air heat can be directly transmitted to the thermal expansion member.

  According to the present invention, since external air heat can be directly transmitted to the thermal expansion member, thermal expansion or contraction of the thermal expansion member accompanying a change in the external temperature can be performed quickly. Therefore, it is possible to immediately detect that the external temperature has become equal to or higher than the predetermined temperature, and it is possible to improve the detection accuracy such as the occurrence of a fire indoors.

  1 to 7 show an embodiment of the present invention. FIG. 1 is a perspective view of a fire alarm, FIG. 2 is a sectional view of a heat detector, FIG. 3 is a functional configuration diagram of the fire alarm, and FIG. Is a flowchart showing the operation of the fire alarm, FIG. 5 is a functional configuration diagram of the fire alarm device showing a modification of the embodiment, FIG. 6 is a functional configuration diagram of the fire alarm device, and FIG. 7 is a modification of the embodiment. It is sectional drawing of a heat sensor.

  The fire alarm device 10 of the present invention is attached to a ceiling or the like, and outputs sound information as alarm information when the indoor temperature reaches a predetermined temperature.

  As shown in FIG. 1, the fire alarm device 10 includes an attachment portion 11 for attaching the fire alarm device 10 to a ceiling or the like, and a heat sensor 100 for detecting an indoor temperature or the like. By being inserted into a mounting groove (not shown) provided on the ceiling or the like, it is attached to the ceiling or the like. In addition, it is suitable to use a material with a small expansion coefficient due to heat for the attachment portion 11, and in this embodiment, the attachment portion 11 is made of resin such as engineer plastic. Moreover, you may comprise the attaching part 11 with metals, such as aluminum. Further, a well-known reflecting member 11a that reflects light or heat, such as an aluminum film, is provided at the lower end of the mounting portion 11, and the reflecting member 11a converts the radiant heat from the fire source to the heat detector 100. Reflected to the side. Furthermore, an alarm information output unit 110, a power supply unit 120, and a power supply unit 130 are provided in the fire alarm device 10.

  As shown in FIG. 2, the heat detector 100 is provided at the lower part of the fire alarm device 10, and includes a cylindrical body 101 formed so as to extend in the vertical direction and a detection signal output unit 102. .

  The cylinder 101 is formed by processing a silicone rubber plate having a predetermined thickness dimension (for example, 1 mm) into a cylindrical shape, and is thermally expanded or contracted in the vertical direction based on an external temperature. Further, the upper end of the cylinder 101 is fixed to the mounting portion 11, and a lid 101 a formed to cover the hollow portion of the cylinder 101 is provided at the lower end of the cylinder 101. In this case, since the upper end of the cylinder 101 is fixed, the lower end of the cylinder 101 thermally expands or contracts in the vertical direction based on the external temperature. The lid 101a is formed of a member different from the cylinder 101, and is made of a metal such as aluminum in the present embodiment. The lid 101a may be formed integrally with the cylinder 101.

  The detection signal output unit 102 is a known touch sensor, and is provided in the hollow portion of the cylinder 101. The upper end of the detection signal output unit 102 is fixed to the mounting portion 11, and a movable contact 102 a that can contact the lid 101 a is provided at the lower end of the detection signal output unit 102 so as to protrude downward. The movable contact 102 a is pressed upward, that is, toward the inside of the detection signal output unit 102 by the lid 101 a when the external temperature is normal temperature. In this case, the movable contact 102a is in an on state. The movable contact 102a is turned off when it is restored, that is, when it completely protrudes downward. The detection signal output unit 102 outputs a predetermined detection signal when the movable contact 102a is turned off.

  The detection signal output unit 102 is provided in a state of being separated from the cylinder 101. Thereby, since the cylinder 101 does not thermally expand or contract while in contact with the cylinder 101, the amount of thermal expansion or contraction can be prevented from changing due to friction with the cylinder 101.

  Here, the operation of the heat sensor 100 will be described with reference to FIG. First, when the external temperature is normal temperature, as shown in FIG. 2A, the movable contact 102a is urged toward the inside of the detection signal output unit 102 by the lid 101a. Here, when the external temperature rises, the lid 101a moves downward along with the thermal expansion of the cylinder 101, so that the movable contact 102a is restored while being in contact with the lid 101a. When the external temperature reaches a predetermined temperature (for example, 60 ° C.) or higher, as shown in FIG. 2B, the movable contact 102a is separated from the lid portion 101a and completely turned off. In this case, a detection signal is output from the detection signal output unit 102. When the external temperature decreases, the lid 101a moves upward as the cylinder 101 contracts. When the external temperature becomes lower than a predetermined temperature (for example, 60 ° C.), the lid 101a comes into contact with the movable contact 102a, so that the movable contact 102a is turned on.

  The alarm information output unit 110 includes a small speaker and a memory such as a CPU, a RAM, and a ROM. The alarm information output unit 110 is driven in a power supply state and outputs predetermined audio information stored in its own memory.

  The power supply unit 120 is a battery provided in the fire alarm device 10 and supplies driving power to the alarm information output unit 110. A commercial power supply may be used as the power supply unit 120. Further, the heat sensor 100 and the power supply unit 130 are connected to the + side of the power supply unit 120.

  The power supply unit 130 includes a thyristor or the like, and is provided between the power supply unit 120 and the alarm information output unit 110 as shown in FIG. The power supply unit 130 has a power supply unit 120 connected to the anode side of the thyristor and an alarm information output unit 110 connected to the cathode side. Further, when a detection signal is output from the heat detector 100, the power supply unit 130 is connected so that the detection signal passes through the gate of the thyristor. That is, driving power is supplied from the power supply unit 120 to the alarm information output unit 110 when the contact unit 102a of the detection signal output unit 102 is turned off.

  The operation of the fire alarm device 10 configured as described above will be described with reference to the flowchart of FIG. First, when a fire occurs, the cylinder 101 of the heat sensor 100 is thermally expanded due to an increase in external temperature. In this case, since the cylindrical body 101 is exposed to the outside, it is possible to directly transmit external air heat to the thermal expansion member. In this case, the radiant heat from the fire source is efficiently transmitted to the thermal expansion member by the reflecting member 11 a provided in the attachment portion 11. When the external temperature becomes equal to or higher than a predetermined temperature (for example, 60 ° C.), the movable contact 102a of the detection signal output unit 102 is turned off (step S1). In this case, a detection signal is output from the detection signal output unit 102, and the detection signal is input to the power supply unit 130 (step S2). When the detection signal is input to the power supply unit 130, the driving power of the alarm information output unit 110 is supplied from the power source unit 120 to the alarm information output unit 110 (step S3). Next, the alarm information output unit 110 is driven by driving power supplied from the power supply unit 120, and outputs audio information as alarm information (step S4).

  Thus, according to the heat sensor 100 of the present embodiment, the cylindrical body 101 provided with the lid portion 101a on one end side and the hollow portion of the cylindrical body 101 are provided, and the external temperature is a predetermined temperature (for example, 60). When the contact point 102a with the lid part 101a is turned off based on the thermal expansion of the cylindrical body 101, the detection signal output unit 102 that outputs a detection signal is provided. It can be directly transmitted to the body 101, and the thermal expansion or contraction of the cylindrical body 101 accompanying the change in the external temperature can be performed quickly. Therefore, it is possible to immediately detect that the external temperature has become equal to or higher than the predetermined temperature, and it is possible to improve the detection accuracy such as the occurrence of a fire indoors.

  Moreover, since the cylinder 101 is formed of silicone rubber, the heat resistance and water resistance of the heat sensor 100 can be improved.

  Furthermore, since the lid portion 101a is formed of a member different from the cylindrical body 101, the cylindrical body 101 can be easily processed, and an increase in manufacturing cost can be suppressed by providing the lid portion 101a integrally with the cylindrical body 101. can do.

  Furthermore, according to the fire alarm device 10 of the present embodiment, the heat sensor 100 and the alarm information output unit 110 that outputs sound information when a detection signal is input from the heat sensor 100 are provided. The external air heat can be directly transmitted to the cylinder 101 of the heat sensor 100, and the thermal expansion or contraction of the cylinder 101 accompanying the change in the external temperature can be performed quickly. Accordingly, it is possible to immediately detect that the external temperature has become equal to or higher than the predetermined temperature, and it is possible to quickly detect that a fire has occurred indoors.

  In addition, a power supply unit 120 for the alarm information output unit 110 and a power supply unit 130 that supplies driving power from the power supply unit 120 to the alarm information output unit 110 only when a detection signal is input from the heat detector 100 are provided. The alarm information output unit 110 outputs the alarm information in the power supply state, so that, for example, it is possible to reduce the power consumption of the entire fire alarm 10 when no fire has occurred, thereby realizing energy saving. be able to.

  In addition, the said embodiment is only one specific example of this invention, and this invention is not limited only to the said embodiment. For example, in the above-described embodiment, the driving power is supplied from the power supply unit 120 to the alarm information output unit 110 only when the movable contact 102a of the heat sensor 100 is turned off. Even when the driving power is supplied to the alarm information output unit 110 only when is turned on, the same effect as the above embodiment can be obtained. Further, the movable contact 102a may be turned on or off based on the contraction of the cylinder 101.

  Moreover, in the said embodiment, although the fire alarm device 10 outputs the audio | voice information as alarm information, so that the fire alarm device 10 may transmit an alarm signal with respect to the predetermined | prescribed fire alarm device 20. It may be configured. In this case, the fire alarm device 10 is provided with an alarm signal output unit 140 that outputs an alarm signal to the fire alarm device 20 instead of the alarm information output unit 110, as shown in FIG. The fire alarm device 10 is configured to perform wireless communication with the fire alarm device 20. When the fire alarm device 20 receives an alarm signal from the fire alarm device 10, the fire alarm device 20 outputs audio information as alarm information. It is like that. The alarm signal output unit 140 includes a CPU, a memory such as a RAM and a ROM, an RF (Radio Frequency) circuit, an A / D conversion circuit, an antenna, and the like. When the detection signal is output, the power supply state is set, and a predetermined alarm signal stored in its own memory is output to the fire alarm device 20.

  As shown in FIG. 6, the fire alarm device 20 includes a communication control unit 21 that performs wireless communication with the fire alarm device 10 and an alarm output unit 22 that outputs audio information. The communication control unit 21 includes a CPU, a memory such as a RAM and a ROM, an RF circuit, an A / D conversion circuit, an antenna, and the like, and receives an alarm signal from the fire alarm 10. . Moreover, the communication control part 21 transmits the audio | voice information stored in the own memory to the alarm output part 22, when an alarm signal is received. The alarm output unit 22 is a known speaker, and outputs audio information received from the communication control unit 22 to the outside.

  By comprising in this way, since it is not necessary to provide the alarm information output part 110 in the fire alarm device 10, the manufacturing cost of the fire alarm device 10 can be reduced.

  Furthermore, as shown in FIG. 7, the cylinder 101 of the heat sensor 100 may be provided so as to extend in the horizontal direction. In this case, the same effect as the above embodiment can be obtained.

The perspective view of the fire alarm which shows one Embodiment of this invention Cross section of heat sensor Functional configuration of fire alarm Flow chart showing operation of fire alarm Functional configuration diagram of a fire alarm showing a modification of the embodiment Functional diagram of fire alarm system Sectional drawing of the heat sensor which shows the modification of embodiment

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Fire alarm, 100 ... Heat sensor, 101 ... Cylindrical body, 101a ... Cover part, 102 ... Detection signal output part, 102a ... Movable contact, 110 ... Alarm information output part, 120 ... Power supply part, 130 ... Power supply Department.

Claims (5)

A cylindrical thermal expansion member provided with a lid on one end side;
Provided in the hollow part of the thermal expansion member, outputs a predetermined detection signal when the contact point with the lid part is turned on or off based on the thermal expansion or contraction of the thermal expansion member when the external temperature exceeds the predetermined temperature And a detection signal output unit. The heat sensor according to claim 1, wherein the thermal expansion member is formed of silicone rubber. The heat detector according to claim 1, wherein the lid portion is formed of a member different from the thermal expansion member. The heat detector according to claim 1, 2, or 3,
A fire alarm device comprising: an alarm information output unit that outputs predetermined alarm information when a detection signal is input from the heat detector. A power supply unit for the alarm information output unit;
A power supply unit that supplies driving power from the power supply unit to the alarm information output unit only when a detection signal is input from the heat detector;
The fire alarm device according to claim 4, wherein the alarm information output unit outputs the alarm information in a power supply state.

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