JPH0425149Y2 - - Google Patents

Description

[Detailed description of the invention] a. Industrial application field The present invention automatically injects extinguishing agent by activating a relay for driving a fire extinguisher activation coil based on a fire detection signal from a fire detector. The present invention relates to an automatic fire extinguishing system, and more specifically, to an automatic fire extinguishing system capable of conducting extinguishing agent injection tests.

b. Prior Art The automatic fire extinguishing system as described above is incorporated into, for example, electrical discharge machines, machining centers, and the like. In this type of automatic fire extinguishing system that is commonly used, when injecting extinguishing agent, when the injection test switch is pressed once, the relay and extinguisher operating coil are activated continuously and all the extinguishing agent is injected. It was impossible to stop the injection midway.

c Problems that the invention aims to solve For this reason, when performing periodic function inspections (tests) of automatic fire extinguishing systems, all of the extinguishing agent is wasted, and a large amount of extinguishing agent is wasted after it is sprayed. It was necessary to refill the extinguishing agent, which was very uneconomical.

The present invention was devised in view of the above-mentioned actual situation, and the object is to provide an automatic fire extinguishing device that can perform a continuous extinguishing agent injection test or an arbitrary short-time extinguishing agent injection test. .

d Means for solving the problem In order to solve the above-mentioned problem, in the present invention, the extinguishing agent is In an automatic fire extinguishing system that automatically injects a fire extinguisher, a series circuit including a contact switch and an operation/test changeover switch, which are turned on when the relay is activated, is connected in series to the relay, and By connecting an injection test switch that selectively operates the injection test switch in parallel to the series circuit and switching the changeover switch to the test side, the injection test switch can be operated continuously or continuously after the injection test switch is operated. The fire extinguisher operating coil is configured to be selectively driven only during the operation period of the test switch.

An embodiment of the present invention will be described below with reference to FIG.

In Figure 1, SL is a solenoid coil for activating a fire extinguisher, RY is a relay activated based on a fire detection signal from fire detector F, and RY _a and RY _b are turned on by relay RY. Contact, PBS
is a push button switch for extinguishing agent injection (injection test switch), SW is a changeover switch for operation and testing, T ₁ and
_T2 is an input terminal. As shown in the figure, a series circuit consisting of a solenoid coil (fire extinguisher operating coil) SL and a contact RY _b is connected between power lines A and B, and a relay RY and a push button switch for injecting extinguishant are connected.
A series circuit with PBS is connected. and,
A series circuit of relay RY _a and changeover switch SW is connected in parallel to the push button switch PBS.

In addition, the above-mentioned changeover switch SW is connected to the input terminal T ₂
a movable contact a and two fixed contacts b connected to the
c, and one fixed contact b is a contact RY _a
, and the other fixed contact c is arranged independently from the circuit.

Next, the manner of use of the automatic fire extinguishing system of this example will be described.

First, a case will be described in which the movable contact d is switched to the fixed terminal b side (operating side) as shown by the solid line in FIG. 1 by operating the changeover switch SW. In this case, when a fire is detected by fire detector F, relay RY is activated based on the fire detection signal from fire detector F, and contact RY _a is switched on accordingly. It will be done. Then, the contact RY _b is switched to the on state, and as a result, the solenoid coil SL is driven and the solenoid coil SL for activating the fire extinguisher is excited, and the plunger (not shown) is sucked, thereby injecting the extinguishing agent (not shown). The valve is opened and extinguishing agent is injected. In addition, when the extinguishant injection push button switch PBS is pressed to turn on, relay RY is activated and contact RY _a
and RY _b both turn on. Along with this,
Solenoid SL is energized and extinguishing agent is injected.
At this time, even if the push button switch PBS is released from the press and switched to the OFF state, power continues to be supplied via the changeover switch SW and contact RY _a , so the relay RY is self-retained and continues to operate. . Therefore, once the injection switch SW is turned on, all extinguishing agent will be continuously injected from then on.

On the other hand, operate the changeover switch SW to move the movable contact d to the fixed terminal c as shown by the imaginary line in FIG.
side (test side), press the extinguishant injection push button switch PBS to turn it on, and the relay RY and the solenoid coil SL for operating the fire extinguisher will operate as in the case described above. The fire extinguishing agent is then injected. However, in this case, when the pressure on the changeover switch SW is released and the switch is turned off, the power supply to the relay RY is cut off, so both contacts RY _a and RY _b are turned off, and solenoid coil SL is turned off. becomes inactive.
Therefore, the extinguishing agent is injected only while the push button switch PBS is in the on state, and thereafter the extinguishing agent is stopped.

e. Effects of the invention As described above, the present invention enables continuous injection of the entire amount of extinguishing agent or only during the operating period of the injection switch (any short period of time) by switching the operating/testing switch to the testing side. Since the system is configured to selectively perform minute injections of extinguishing agent over a wide range of areas, when testing the extinguishing agent injection function during periodic maintenance and inspection of the automatic fire extinguishing system, the selector switch must be placed on the test side. By switching, only a small amount of extinguishing agent is required, and inspection work can be carried out easily and economically.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of the main parts of an automatic fire extinguishing system according to the present invention. F...Fire detector, SL...Solenoid coil for fire extinguisher operation (fire extinguisher operating coil), RY...Relay, RY _a , RY _b ...Contact, PBS...Push button switch for extinguishing agent injection (for injection test) switch), SW…
...Switch for operation/testing.

Claims (1)

[Scope of utility model registration request] In an automatic fire extinguishing system that automatically sprays extinguishing agent by activating a relay for driving a fire extinguisher activation coil based on a fire detection signal from a fire detector, the relay is turned on when the relay is activated. A series circuit consisting of a contact switch and an operation/test changeover switch is connected in series to the relay, and an injection test switch that selectively operates the relay is connected in parallel to the series circuit, and the changeover switch is tested. By switching to the side, the fire extinguisher operating coil is selectively driven either continuously after the injection test switch is operated or only during the operation period of the injection test switch. An automatic fire extinguishing system characterized by comprising: