FI100459B - Fire extinguishing system in which high pressure gas is used as the extinguishing agent - Google Patents

Abstract

The invention relates to an extinguishing process for operating a gas fire extinguishing installation for extinguishing areas with equipment which is sensitive to the consequential effects of extinguishing agents and to the effects of condensate. <IMAGE>

Description

100459

Fire extinguishing system in which high pressure gas is used as extinguishing agent

The present invention relates to a method of operating a fire extinguishing system for sensitive electronic equipment, in which the extinguishing medium is spread during discharge in such a way as to avoid condensation on the circuit board and individual components.

Such fire extinguishing systems are used in particular to protect the environment and materials in data processing systems, switching and control centers and similar danger areas. These fire extinguishing systems mainly comprise a fire detection system, an extinguishing control system and an extinguishing medium tank 20 embedded in one or more high pressure cylinders, a nozzle with nozzles for discharging the extinguishing medium, in connection with a high-pressure cylinder to release the extinguishing medium.

In gas-based extinguishing systems, in which the gaseous extinguishing medium is stored as a pressurized liquid, such as in CO 2 high-pressure or halon systems, there is a risk that during the phase change, the liquid-to-gaseous state at the nozzles becomes. so much heat is taken from the environment that the temperature drops. The water vapor in the air will condense into 35 microfine droplets.

Condensation of these droplets on circuit boards and electronic components can cause damage as a result of the absorption of solder 2 100459 chips, acid and alkali gases, which after a long time (with extinguishing medium) can cause serious defects and consequent damage, the cause of which is difficult to determine.

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In particular, in the event that the quick-acting valve is activated by means of a fire detection and extinguishing control unit equipped with early warning technology, a faulty or erroneous tripping of such extinguishing systems cannot be completely avoided. The severe deterioration in visibility associated with very fine grinding in the environment, together with the loud discharge sound, can cause panic reactions in personnel present in a protected environment. This is especially true for halon extinguishing systems, where masking can occur without warning because the extinguishing medium, at concentrations capable of extinguishing a fire, is not dangerously toxic during short periods of exposure.

20 As the halon extinguishing medium has been found to deplete the ozone layer, incorrect activation of the halon extinguishing systems cannot be accepted from an environmental point of view.

It is an object of the present invention to provide an extinguishing system which operates according to the principle of oxygen transfer, which does not lower the dew point in a covered environment upon activation and does not endanger personnel due to the extinguishing medium itself or the effects of the covering.

This object is solved by the measures defined in the appended claim 1.

35 The extinguishing medium is fed through the initial block to the manifold, which causes the first pressure drop. The extinguishing medium is then fed from the collection line 100459 3 to the right sanitization zone along one or two routes via one or two combined pressure reducing flow restricting devices to the sanitation zone or, in the case of non-zone systems, through one or two combined pressure reducing devices and connected to .

Together with the combined pressure-reducing flow restricting device, the use of the device according to the invention results in a pressure and internal balance control according to a calculation method in which the amount of extinguishing means is controlled by using an adjustable second pressure-reducing flow-limiting device and a nozzle discharge factor. The nozzle discharge factor is a complex variable that can be influenced to control both discharge and discharge noise.

As a result of the computationally controlled extinguishing-20 system of the invention, there is an inevitable relationship between the amounts of extinguishing medium required, the coverage time required, and the allowable discharge noise. An essential part of the present invention is that the calculated flow rates in the pipeline network, which depend on the reservoir pressure of the quench medium in high pressure vessels, are below the threshold at which the individual gas components of the quench medium can dissociate. In addition, the values of the extinguishing concentrations resulting from the calculated method are such that the physiologically permissible lower limit values for O 2 cannot be exceeded by more than .10% and the upper permissible limit values for CO2 by not more than 5%. Two structural examples of the invention are shown in the drawing and are explained in more detail in the following drawing:

Fig. 1 shows a direct electric trip activated by a fire detector unit, 35 4 100459

Fig. 2 shows a mechanical-pneumatic trigger activated by a fire detector unit.

5 Fire extinguishing systems using a gaseous extinguishing means are activated by means of a fire detector and extinguishing control unit 1, whereby they release the extinguishing agent in the gas blades 2 and 3. In both structural examples, two-way extinguishing medium lines 10 and 6 are used, which supply pressure reducers 11a to connection lines 7-12 provided. The connecting lines 7-12 combine to form extinguishing medium lines 19-21 with safety valves 22-24 and flow to the zone valves 25-27, from which the extinguishing medium lines 15-30 lead to the extinguishing nozzles not shown. The zone valves 25-27 are provided with electromagnetic triggers 31-33, which are activated along the control lines 34-36 leaving the fire detector unit 1.

In the example shown in Fig. 1, a control line 37 is further used, which leads from the fire detector unit 1 to an electromechanically triggered valve 4 connected to the activation cylinder 3. This cylinder 3 filled with extinguishing medium initially activates the next gas cylinders 2 in succession. In the event that a fire is detected in a single extinguishing zone, the triggers 31-33 located in the extinguishing zone are activated, whereby they open the zone valves 25-27. At the same time, the Akti-30 lubrication cylinder 3 is controlled via line 37.

In the example shown in Figure 2, the electromagnetic triggers 31-33 communicate with the control cylinders 38-40 through the control valves 41-43. The control lines 44-35 46 flowing to the double lines 47-52 lead out of the control valves 41-43, where each of the two double lines 47, 49, 51 communicates with the mechanical-pneumatic opening devices 53-55 of the zone valves 25, 100459 5 26 and 27. In addition, the control lines 59-61, which are provided with non-return valves 62-64 and flow into the control line 65 led to the pneumatic trigger 66 in connection with the activation cylinder 3, will open in use by means of mechanical-pneumatic opening devices 53-55. Mechanical-pneumatic triggering will also cause control pulses to be conducted from the fire detector unit 1 to the electromechanical triggers 31-10 33 in the event of a fire. This causes the control valves 41-43 to open and thus the control cylinders 38-40 to open so that the zone valves 25-27 will open through these pressure vessels through the mechanical-pneumatic opening devices 53-55. As a result, the lifting pistons 15 in the mechanical-pneumatic opening devices 53-55 are initially activated using the control lines 47, 49 and 51, and thus the zone valves 25-27 will open using the mechanical opening devices 56-58. Only after the mechanical opening devices have been actuated by means of the lifting pistons in the mechanical-pneumatic opening devices will the control pressure be supplied via the control lines 59-65 to the pneumatic trigger 66 connected to the activation cylinder 3, and this will open.

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An essential part of the invention is that the fire detector unit initially sends only one control signal to the electromagnetic triggers 31-33 along one control line 34-36 and therefore only one of the zone valves 25-27 will open. As soon as the fire detector unit 1 activates even only one of the zone valves 25-27, the activation cylinder 3 is activated and opened. Safety valves 22-24 are located in the extinguishing medium lines 19-21 to prevent overpressurization of the zone valves 25-27.

In order to avoid large pressure shocks, pressure reducers 13-18 are used, which, in addition to reducing the pressure, also limit the flow. The mechanical pneumatic control valves 41-43 known per se are provided with a positive connection for pneumatically activating the pneumatic trigger 66 via mechanical-pneumatic opening devices 53-55. This operation ensures that one of the zone valves 25-27 always opens first and then the pneumatic trigger 66. Check valves 62-64 located in control lines 59-61 form check valves to prevent incorrect pneumatic triggering of one of the zone valves 25-27.

Claims (4)

1. A fire extinguishing system for a extinguishing agent in the form of a high pressure gas, for example Ar, N2 or preferably INERGEN, with a fire alarm and extinguishing control center (1), which for each extinguishing section is connected to the valve (41 to 43) for a control bottle (38 tili 40) via a first control line (34 tili 36), the fast opening valves of the extinguishing tanks (2) acting as the first pressure reducing device containing the extinguishing means. the means, and the extinguishing section valves (25 tili 27), can be activated to open position, that the valves of the control bottles (38 til 40) are provided with electromechanical. . 25 actuators (31 to 33), to which the first control lines (34 to 36) are connected, that each control bottle (38 to 40) is connected to the section valves (25 to 27) through other control lines (44 to 52) and mechanical-pneumatic opening devices (53 tili 55), that third control lines (59 tili 61 and 65) project from the mechanical-V pneumatic opening devices (53 tili 55) and are "connected to a pneumatic trigger (66) for one with a bottle battery. (2) connected pilot bottle (3), that the pilot bottle (3) and the bottle battery (2) are connected to the extinguishing duct pipes (25 to 27) through the single or two-branch extinguishing lines (5, 6). and connecting lines (7, 12), and the connecting lines (7 to 12) being provided with pressure reductions (13 to 18). Fire extinguishing system according to claim 1, characterized in that the quantities of extinguishing media required for the various extinguishing sections can be supplied to the pipe network (28 to 30) and the extinguishing nozzles in a mathematically adapted manner by those used as other pressure reduction and flow reduction devices (13). to 18) 10 within the required outflow time. Fire extinguishing device according to claims 1 and 2, characterized in that the pressure reduction and flow limiting devices (13 to 18) are designed as throttle or throttle passages. Fire extinguishing system according to claims 1 to 3, characterized in that its object can be adapted to existing halon or CO 2 pipe networks by means of the calculation process and by the design of the pressure reduction and flow limiting devices (13 to 18). and the extinguishing nozzles mounted at the ends of the lines (28 to 30).