JPH0433192U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of the present invention. FIG. 2 is a diagram showing the voltage and operation of the main components in the above embodiment when the sensor 3 is short-circuited, when a fire occurs, and when there is no fire. FIG. 3 is an overall view of the above embodiment. FIG. 4 is a circuit diagram of another embodiment of the present invention. Figure 5 shows
In the embodiment shown in FIG. 4, the voltage of the sensor 3 in each case when a short circuit occurs, when a fire occurs, and when there is no fire,
It is a figure which shows the operation|movement of a main member. FIG. 6 is a diagram showing an example of an electric circuit in a conventional example. 5, 51...Control unit, 8...Valve unit, I...Initiator, IC1 to IC3...Comparator, T
R1 to TR3...transistor, BZ...buzzer, C...capacitor, N...relay, M...multivibrator, L1, L2...signal line.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A fire detection means that sends out an electrical signal when a fire is detected; A control means that starts a fire extinguishing device in response to the electrical signal; This control means and the fire detection means are connected. two signal lines for detecting a short circuit; a short-circuit detection means for detecting a short circuit in the fire detection means; an activation for preventing activation of the fire extinguishing system when the short-circuit detection means detects a short circuit in the fire detection means; An automatic fire extinguishing system characterized by having: a prevention means; (2) In claim (1), the fire detection means includes a switch that operates when the fire is detected, and a first resistor connected or formed in series with the switch; A second resistor connected in series with the first resistor is turned off when the detection voltage, which is the voltage at the connection point between the first resistor and the second resistor, is lower than the first reference voltage. a first comparator; the control means has a second comparator that is turned off when a second reference voltage lower than the first reference voltage is higher than the detection voltage; and a starting means for starting the fire extinguishing device when both the second comparators are turned off, and the starting preventing means is configured such that the detected voltage is the same as the first one.
An automatic fire extinguishing system that stops activation of the fire extinguishing system when the voltage is higher than a reference voltage. (3) In claim (1), the fire detection means includes a switch that operates when the fire is detected, and a second resistor connected or formed in series with the switch; The short circuit detection means includes a relay that operates when the main signal line is energized, and a starting means that starts the fire extinguishing device when the relay is activated, and the short circuit detection means includes a second relay connected in series with the resistor. and a comparator that compares a detected voltage, which is a voltage at a connection point between the first resistor and the second resistor, with a predetermined reference voltage, and the activation prevention means is configured to control the detected voltage. An automatic fire extinguishing system characterized in that the activation of the fire extinguishing system is stopped when the voltage is higher than the reference voltage. (4) Claim (1) provides that the short circuit detection means comprises a multivibrator that operates when a short circuit is detected, and a buzzer or lamp that intermittently sounds or lights up in response to the operation of the multivibrator. Features an automatic fire extinguishing system.