JPS6325786B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an automatic fire monitoring device installed in a kitchen or the like.

[Background technology]

Conventionally, heat detectors and fire extinguishing agent nozzles were placed in kitchens and their exhaust ducts, and when an abnormal temperature rise was detected, fire extinguishing agent was automatically injected to the location where the fire occurred. An automatic fire extinguishing system has been proposed. In such conventional automatic fire extinguishing systems, a mechanical contact type using a bimetal or the like is generally used as a heat sensor. This type of mechanical contact type heat sensor has a preset temperature,
When the ambient temperature approaches this set temperature or exceeds this set temperature, an abnormal temperature rise detection output is generated. Therefore,
In the conventional example, the extinguishing agent was suddenly injected, and there was a problem in that it was not possible to know in advance that the temperature would be within a dangerous range where the extinguishing agent would be injected. In addition, in such a conventional example, a person cooking in the kitchen can also know how much the temperature is currently rising in the kitchen or in the exhaust duct, and how close it is to the set temperature. First, there was a problem in that it was impossible to even know whether the automatic fire extinguishing system was operating normally or not.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned points, and is capable of occasionally displaying temperature rises in places where fire is handled such as kitchens, and continuously changing the temperature up to the injection of extinguishing agent. An automatic system that can be clearly seen by anyone when the display element is lit, and that can emit an alarm sound in advance when the temperature is in a dangerous range where extinguishing agent is being sprayed. The purpose of this invention is to provide a fire monitoring device.

[Disclosure of the invention]

The configuration of the present invention will be described below with reference to illustrated embodiments. FIG. 1 is a circuit diagram showing the basic configuration of an embodiment of the present invention. In the figure, reference numeral 1 denotes a temperature sensor such as a thermistor, which is placed within the canopy of the kitchen or its exhaust duct. This temperature sensor 1 has a sufficiently small heat capacity so that changes in environmental temperature can be detected quickly. 2 is a constant voltage power supply circuit, which makes the power supply voltage V _DD a constant voltage,
It is applied to both ends of a series circuit of temperature sensor 1 and resistor 3. When the environmental temperature of the temperature sensor 1 made of a thermistor increases, its resistance value decreases, and therefore the voltage across the resistor 3 increases. The voltage across this resistor 3 is the input voltage to the voltage comparator 4.
It is applied as Vin. FIG. 2 is a circuit diagram showing the configuration of the voltage comparator 4. As shown in FIG. As shown in the figure, the input voltage Vin is applied to one input of each of the voltage comparators _n1 to _n10 . Also voltage comparator
The other input of n ₁ to n ₁₀ has a voltage divided by resistors R ₁ , R ₂ and resistors r ₁ to _{r 10} as a reference voltage.
Each of 10 levels of reference voltage is applied. When the input voltage Vin becomes higher than each reference voltage, the output of each voltage comparator _n1 to _n10 changes from H level to L level. The output of the voltage comparator _n1 to which the lowest reference voltage Vmin is applied is already at the L level at room temperature. On the other hand, voltage comparators n ₂ to _{n 4} output at L level at an environmental temperature in the range of 50 to 100 degrees Celsius, which is higher than room temperature but does not pose a risk of fire, and voltage comparators n ₅ to n ₇ output at normal The output becomes L level at an environmental temperature in the range of 100℃ to 150℃, which is higher than the temperature rise during cooking and poses a risk of fire.
Further, the voltage comparators n ₈ to _{n 10} have the values of their respective voltage dividing resistors set so that their outputs are at the L level at an environmental temperature in the range of 150° C. to 200° C., which is considered to be the temperature at the time of a fire outbreak. The highest reference voltage Vmax applied to voltage comparator n ₁₀ and the lowest reference voltage Vmin applied to voltage comparator n ₁ are each connected to resistor R ₁
and can be set freely by appropriately selecting the value of R ₂ . The output of each voltage comparator n ₁ to _{n 10} is connected to the cathode of a light emitting diode h ₁ to h ₁₀ , respectively, and each of these light emitting diodes
The anodes h ₁ to _{h 10} are each connected to the power supply voltage V _DD via a current limiting resistor. Light emitting diode h ₁ to _{h 4} that lights up in the normal cooking temperature range
The light emitting diodes _h5 to _h7 , which light up in the dangerous temperature range where there is a risk of fire, are yellow, and the light emitting diodes _h8 to _h10 , which light up in the temperature range where a fire occurs, are red. A terminal A is connected to the anode side of the red light emitting diodes _h8 to _h10 via selection switches _a1 to _a3 and a backflow prevention diode Da. Further, a terminal B is connected to the anode side of the yellow light emitting diodes _h5 to _h7 via selection switches _b1 to _b3 and a backflow prevention diode Db. For example, select switch a ₂
and selection switch b ₂ are on,
When the temperature detected by the temperature sensor 1 rises to the middle of the fire danger temperature range, the light emitting diode _h6 lights up and the terminal B is connected to the L level. Further, when the temperature detected by the temperature sensor 1 further rises to the middle of the fire occurrence temperature range, the light emitting diode _h9 lights up and the terminal A is connected to the L level.

Figure 3 shows an alarm sound generator 5 connected to terminal B.
FIG. When terminal B goes to L level, base current flows to transistor Tr ₁ in FIG. 3, and the collector of transistor Tr ₁ goes to H level.
level. Therefore, one input of NAND gate _G1 becomes H level, and NAND gate _G1
operates as an inverter. Reference numeral 6 denotes an oscillation circuit consisting of an astable multivibrator, which is composed of a NAND gate _G1 , an inverter _I1 , resistors _R3 , _R4 , and a capacitor _C1 that determine the time constant. The oscillation output of the oscillation circuit 6 is output from the inverter I ₂ ,
Transistor Tr ₂ through a buffer stage consisting of I ₃
is applied to the base of BZ is an electronic buzzer and is intermittently driven by turning on and off the transistor _Tr2 . Therefore, the electronic buzzer BZ will beep.
Fires can be prevented in advance by emitting a beeping alarm and taking measures such as weakening the cooking flame at this stage. When terminal B is not connected to L level, the transistor
Since Tr ₁ is turned off and its collector becomes L level, the output of NAND gate G ₁ becomes H level, the output of inverter I ₁ becomes L level, and the transistor
Since Tr ₂ is turned off, electronic buzzer BZ is turned off.

Figure 4 shows fire extinguishant injection device 1 connected to terminal A.
FIG. 1 is a circuit diagram showing a first drive circuit. When the terminal AL level is reached, a base current flows through the transistor Tr ₃ in FIG. 4, the collector of the transistor Tr ₃ becomes H level, and the transistor Tr ₄ is turned on. When the transistor Tr ₄ is turned on, the red pilot lamp 7 lights up and the emergency alarm 8 also sounds. Also, the relay 9 is turned on, its contacts 10 are closed, and the extinguishant injection device 11 is activated.
12 is a relay for driving other disaster prevention equipment, and is turned on by a signal from a hand-operated switch 13 or another fire detection device inputted via a diode _D1 . There is.

FIG. 5 is a diagram showing an example of the arrangement of an automatic fire extinguishing device in a kitchen. In the figure, 14 is a cooking table like a gas range, and a cooking pot 15 containing oil or the like is placed thereon. Inside the ventilation hood 16 above the cooking table 14, there is a temperature sensor 17 for the fire source,
A fire extinguishing injection nozzle 18 for the fire source is provided. Inside the exhaust duct 19 connected to the ventilation hood 16, a temperature sensor 20 for the duct and a fire extinguishant injection nozzle 21 for the duct are provided. Each extinguishing agent injection nozzle 18 and 21 is connected to an extinguishing agent storage container 24 and 2 via copper piping 22 and 23.
5. Reference numeral 26 denotes an operation panel, on which the above-mentioned light emitting diodes h ₁ to _{h 10} are arranged from the lower position to the upper position of the display surface in order from the element with the lowest display temperature to the element with the highest display temperature. 27 is an emergency push button for manually injecting extinguishing agent. 28
29 is a yellow indicator lamp that lights up at a fire danger temperature, and 29 is a red indicator lamp that lights up at a fire outbreak temperature.

FIG. 6 is a circuit diagram showing the configuration of another embodiment of the present invention. In this embodiment, the light emitting diodes _h2 to _h10 for displaying the detected temperature are driven to light up by general-purpose voltage level detecting ICs 4a and 4b. In FIG. 6, D ₂ and D ₃ are level shift diodes, and 30 is a field effect transistor used as a constant current resistor.
The input voltage of the voltage level detection IC 4b is lower than the input voltage of the voltage level detection IC 4A by the voltage shift caused by the level shift diodes D ₂ and D ₃ .
After all of the light emitting diodes h ₂ to h ₅ in the IC 4a are lit, the light emitting diodes h ₆ to h ₁₀ of the voltage level detection IC 4b are sequentially lit. Light emitting diode _h1 that lights up at room temperature
In this embodiment, the light-emitting diode h1 is driven to light up by the outputs of the operational amplifiers _OP1 and OP2, and when the input voltage is normally applied to the voltage detection IC _4a , the light-emitting diode _h1 lights up. The input voltage input to the voltage detection resistor 4a can be finely adjusted by a variable resistor VR.
In addition, in this embodiment, buffer amplifiers BF1 to _BF1 are connected to the output sides of the selection switches _a1 to _a3 and _{b1 to b3} .
BF ₆ is connected. When the temperature reaches a fire hazard and one of the outputs of the buffer amplifiers BF ₄ to _{BF 6} selected by the selective light emitting switches b ₁ to b ₃ becomes L level, the yellow light emitting diode 28 lights up. . Further, when the fire occurrence temperature is reached and any one of the outputs of the buffer amplifiers BF ₁ to _{BF 3} selected by the selection switches a ₁ to _{a 3} becomes L level, the red light emitting diode 29
lights up. Terminal A' is an output terminal for driving other disaster prevention equipment, and becomes L level when the hand-operated switch 13 is pressed. At this time, terminal A also becomes L level via diode _D4 . SW is a manual automatic changeover switch, and when this switch SW is closed, it becomes automatic, and the buffer amplifiers BF ₁ to _{BF 3}
When any one of the outputs selected by the selection switches _a1 to _a3 becomes L level, the terminal
A' is also automatically set to L level. Note that DIP switches or the like can be used as the selection switches a ₁ to a ₃ and b ₁ to b ₃ .

〔Effect of the invention〕

The present invention is configured as described above, and has a temperature detection section that generates an output voltage according to the environmental temperature in a place where fire is handled such as a kitchen, and the output voltage of the temperature detection section as input, and is capable of preventing fires from occurring during normal conditions. There is a voltage comparison section that compares the output voltage from the temperature detection section in the temperature range up to the time of occurrence with multi-step reference voltages, and the output of the voltage comparison section is used to drive the lighting, and the output voltage from the temperature detection section is applied to the voltage comparison section. A large number of display elements each light up when the reference voltage of each stage is exceeded, and when the display element of each display element lights up at a temperature close to the temperature at which the fire occurred, extinguishing agent is injected at the location where the fire occurred. A fire extinguishing agent injection device,
Among the display elements, the display element is equipped with an alarm sound generator that emits an alarm sound when the display element lights up at a temperature slightly lower than the temperature at which a fire occurs, so that the extinguishing agent is not suddenly sprayed. However, if the temperature is in a dangerous range where extinguishing agent is injected, an audible alarm will alert you in advance that there is a risk of a fire, and at this stage, you will be able to avoid cooking fires. This has the effect of preventing fires in advance by taking measures such as weakening the This allows people in the kitchen to know the current temperature rise in the kitchen and exhaust ducts, how close they are to the set temperature, and whether or not the automatic fire extinguishing system is working properly. Furthermore, the present invention has the effect that the above-mentioned large number of display elements can be divided into a group for displaying the temperature range during cooking, a group for displaying the dangerous temperature range, and a group for displaying the temperature range at the time of a fire outbreak. The display elements are divided into display groups, each group has a different emitted light color, and the display elements are arranged in order from the lower display temperature to the higher display temperature from the lower position to the upper position of the display surface. Therefore, depending on the emitted color of the display element and its height position,
Changes in temperature rise can effectively give the user a sense of urgency as they approach a dangerous area, and have the effect of prompting the user to take prompt action such as stopping the use of fire before a fire breaks out. If you are a fire user, you tend to be slow to decide to stop using fire, but by making the display changes on the display element clear as described above, you can encourage your decision and reduce the risk of it being too late in the event of a fire. It has the excellent effect of being able to

As described in the description of the embodiments of the present invention, the extinguishing agent injection device is configured to display the display element selected by the first selection switch among the plurality of display elements that light up near the temperature at which a fire occurs. The device injects extinguishing agent when the fire is turned on, and the alarm sound generating device is a display element selected by a second selection switch from among a plurality of display elements that light up at a temperature slightly lower than the temperature at the time of fire occurrence. A device that emits an alarm sound when the fire extinguisher injection device is turned on would be convenient because the temperature at which the fire extinguishant injection device operates and the temperature at which the alarm sound generation device operates can be freely set according to the usage environment. be.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of the main part of one embodiment of the present invention, and FIG.
The figure is a circuit diagram of the voltage comparator used in the above, Figure 3 is a circuit diagram of the alarm sound generator used in the same, Figure 4 is a circuit diagram showing the drive circuit of the extinguishant injection device used in the same, and Figure 5 is FIG. 6, which is a diagram showing an example of the arrangement of an automatic fire extinguishing system in a kitchen, is a circuit diagram of a main part of another embodiment of the present invention. 1 is a temperature sensor, 4 is a voltage comparator, 5 is an alarm sound generator, 11 is a fire extinguisher injection device, and h ₁ to h ₁₀ are display elements.

Claims (1)

[Claims] 1. A temperature detection unit that generates an output voltage according to the environmental temperature in a place where fire is handled such as a kitchen, and a temperature detection unit that uses the output voltage of the temperature detection unit as input, There is a voltage comparison section that compares the output voltage from the temperature detection section with multi-step reference voltages, and the output of the voltage comparison section is used to drive the lighting, so that the output voltage from the temperature detection section exceeds the reference voltage of each step in the voltage comparison section. a fire extinguishing agent injection device that injects extinguishing agent to the place where the fire occurred when each of the display elements lights up at a temperature close to the temperature at which the fire occurred; Among the display elements, an alarm sound generating device is provided that generates an alarm sound when the display element lights up at a temperature slightly lower than the temperature at the time of fire occurrence, and the temperature range during cooking of the large number of display elements is set. It is divided into a display group, a group that displays the dangerous temperature range, and a group that displays the temperature range in the event of a fire, and the emitted light color of each group is different, and each display element is moved from the lower position to the upper position on the display screen. 1. An automatic fire monitoring device characterized in that display elements are arranged in order from display elements with lower display temperatures to display elements with higher display temperatures. 2. A fire extinguishing agent injection device is a device that injects a fire extinguishing agent when a display element selected by a first selection switch among a plurality of display elements that light up near the temperature at which a fire occurs is lit, and The alarm sound generation device is a device that generates an alarm sound when the display element selected by the second selection switch lights up among the plurality of display elements that light up at a temperature slightly lower than the temperature at the time of fire occurrence. An automatic fire monitoring device according to claim 1, characterized in that: