DE2703004A1 - Fire sprinkler system for cold store room - has main supply and branches with gas of different pressures separated by valves - Google Patents

Abstract

The system is partic. for cold store applications where no liq. extinguishing agent must be present in the piping inside the room whilst the system is not in active operation. The main supply pipe as well as the branches are filled with pressurised gas of different pressures. The gas pressure in the supply pipe is maintained from one source and the branches from another source via respective non return valves. If, after outbreak of fire one of the sprinkler heads opens, pressure maintained by the gas drops and non return valves allow the pressure in the supply pipe to drop. The decreased pressure in the supply pipe registers via the line in a chamber of the operating valve. Higher pressure in the main supply end pushes the plunger into the chamber to open the passage of pressurised extinguishing agent into the main supply pipe.

Description

Jan. 24, 1977 "Sprinkler system"

The invention relates to a sprinkler system for fire protection in warehouses, in particular in deep-freeze warehouses, with a sprinkler system whose sprinkler pipe network with is filled with a compressed gas.

Such systems are used to prevent unintentional flooding of the sprinkler pipe network and thus freezing to prevent the same. For this purpose it is known to apply an antifreeze to such pipeline systems fill (German Offenlegungsschrift 2345380) or pump the extinguishing water continuously in a closed circuit.

The well-known dry systems are not suitable for use in deep-freeze warehouses, since when the alarm valve is opened, the entire pipeline network is filled with extinguishing water will. It is not to be avoided that this gets into the sprinkler pipework (Sprinkler lines) infused water freezes immediately. Another disadvantage is that that a leak in the pipeline network causes it to be filled with extinguishing water.

So-called pre-action systems are also known to date do not rule out incorrect flooding of the pipeline network. The response of a hand-held detector always causes a Flooding of the pipeline network.

Up to now, many searches have been made for an extinguishing system that has the disadvantages of the dry and the pre-controlled system the use of water as an extinguishing agent is not appropriate.

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The invention is based on the object in a sprinkler system in the event of fire as well as in the event of a malfunction, to prevent extinguishing water from entering the parts when the alarm valve is open of the sprinkler pipe network in which there are no open sprinklers.

This object is achieved in that the supply line and the sprinkler lines of the pipe network are different with compressed gas Pressure filled and the two pipe sections separated from each other on the pressure side by pressure-dependent valves are.

vom With this measure it is achieved that the alarm valve is coming Extinguishing water only flows into the sprinkler line in which the open sprinkler or sprinklers are located.

An embodiment of the invention is shown in the drawing and is described in more detail below. It shows:

1 shows a sprinkler system with a pilot-operated system.

2 shows a circuit arrangement.

With the system shown in FIG. 1, the known disadvantages are eliminated, since incorrect flooding of the pipeline network in the event of leaks or when a fire alarm is triggered excluded are. Before the pipeline network is flooded or filled with extinguishing water, two functions must be namely the opening of the sprinkler and the response of a fire alarm must be fulfilled.

The installation of check valves 20 and 21 upstream of each sprinkler line 23 and the different pressures of a compressed gas in the supply system leading to sprinkler tiers 23

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line 6 and in the sprinkler lines 25 leads to that after the alarm system has responded and a sprinkler has been opened, the extinguishing water only enters the sprinkler lines flows into which a sprinkler has opened.

In the sprinkler drinkers there is a common upstream Throttle bore 23 built up a gas pressure which is approx. 2 bar above the maximum occurring water pressure the sprinkler system. In the supply line which leads from the alarm valve C to the sprinkler lines, a gas pressure is also built up, which each one has lower pressure than in the strands 25 and is used to open the valve.

In the operational state, the sprinkler lines 25 fed by a check valve 20 from the supply line 6 through the pressurized gas source B via the shut-off valve 22, throttle bore 23 and check valve 21 and line 2k are under a higher gas pressure than the supply line 6 itself Supplied with compressed gas via shut-off valve 18, throttle check valve 14 and check valve.

The main chamber 1 of the alarm valve C is connected to the water supply line 2 and separated from the pressure chamber by the movably arranged piston 3 with capillary k. In addition, the supply line 6 leading to the extinguishing organs, the alarm line 7 and the pressure monitor 8 are connected to the chamber system of this alarm valve. From the pressure chamber 5, the discharge line 9 leads to the solenoid valve 50 via the line 11 to the pneumatically controlled shut-off valve 12 and to the supply line 6. To the pressure chamber of the pneumatically operated shut-off valve 12, the line 1 $ coming from the compressed gas source A leads before reaching the pressure chamber of the pneumatically operated shut-off valve 12, branches

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from the line 16 from the line 17, which via valve 19, which is open in the operational state, ends freely and in which the compressed gas valve 12 a is arranged, the is equivalent to the pneumatically operated shut-off valve 12. In the pressurized gas source shown by the coming compressed gas line 13 are arranged one after the other, a shut-off valve 18, a throttle check valve 14, the branch of the line 16 and the check valve 15. Ultimately, this pressure gas line 13 opens into the supply line 6 a.

In Fig. 2 is the control of the signaling system acting on the solenoid valve 5o for a pre-controlled sprinkler system shown. The solenoid valve 50 is arranged in the line 9, which the pressure chamber 5 of the alarm valve connects. The contact of the detector 54 is closed when the system is ready for operation the relay 51 via the contact 511 itself and closes the contact 512 via the solenoid valve 50 with current is supplied, which closes the connecting line 9 in this state. When reaching the characteristic The addressed detector 54 and opens fire parameters the Baiais 51 falls under the opening of the centrepieces 5U and away. As a result, the solenoid valve 50 is de-energized and is the Connection line 9 free. The system according to the invention can now fulfill its function, as it is for example to Fig. 1 is described. This mode of operation also remains in the event of a power failure or any other Fault in the reporting system received, because in this state the solenoid valve opens and thus the connection line 9 is free. After the characteristic Fire characteristic, the detector 54 closes its contact. at Pressing the button »510 attracts the Beiais 51 and maintains itself via the contact 511 that closes with it. The contact closed when the relay 51 is picked up 512 provides power to solenoid valve 50

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Ip 270300A

here that the connecting line 9 interrupts. Each re-ignition of the extinguished fire initiates the extinguishing process again in the same switching sequence if the alarm system is functional. If the push button 510 is permanently bridged, an automatic circuit is created which is controlled ^{solely by the detector 5 1 ».}

After a sprinkler has opened, the pressure prevailing in the sprinkler line 25 concerned is rapidly reduced, since Less pressurized gas flows in via the throttle check valve 23 than flows out to the open sprinkler.

The pressure drop in the line 25 causes the passage of the check valve 20, so that the in the supply line The prevailing pressure above the open sprinkler is also reduced.

This causes the pressure in the feed line to drop. This pressure drop continues through line 11 and line 9 to into the pressure chamber 5 of the alarm valve. The piston 3 is pushed into the pressure chamber 5 and thus releases the opening of the supply line 6. Through this can supply the extinguishing agent from supply line 2 Flow unhindered into the supply line 6 to the pressure-relieved pipe string and to the extinguishing organs. At the same time, the alarm line 7 is released, into which the water also penetrates and by means of suitable Transmissions trigger the alarm.

The sprinkler system according to the invention is excellently suited for use in extremely low and high temperatures. It guarantees because of the smaller pipeline volume a faster fire fighting and is in addition to the pressure-controlled alarm valve described also for any other dry alarm valve can be used if the fire alarm system is not used.

Instead of the check valves 20, 21, pneumatically or electrically controlled valves can also be used.

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L e r s e i t e

Claims (7)

Claims 9 7 Π ^ Π Π Α l) Sprinkler system for fire protection in warehouses, in particular in cold stores, with a sprinkler system, the sprinkler pipe network of which is filled with a pressurized gas, thereby characterized in that the supply line (6) and the sprinkler lines (25) of the pipe network with compressed gas are different Pressure filled and the two pipe sections (6 and 25) through pressure-dependent valves (20) from each other are separated. 2) sprinkler system according to claim 1, characterized in that the gas pressure in the sprinkler lines (25) is higher is than the pressure in the supply line (6). 3) Sprinkler system according to claims 1 and 2, characterized in that that the supply line (6) and the sprinkler lines (25) are connected to different gas sources are. 4) Sprinkler system according to claims 1 and 2, characterized in that that the supply line (6) and the sprinkler lines (25) are connected to a gas source, from which two lines emanate, one line having a pressure change device. 5) Sprinkler system according to claims 1 to 4, characterized in that that the valves (20) as check valves and are arranged between the supply line (6) and the respective sprinkler lines (25). 6) Sprinkler system according to claims 1 to 5, characterized in that that both to the supply line ^) and to the sprinkler lines (25) separate gas lines (l3, 24) and are provided with pressure-dependent valves, in particular check valves (21). 7) Sprinkler system according to claims 1-7, characterized in that that the compressed gas supply line led to the sprinkler lines (25) (24) is provided with a throttle (23). 809830/0435
ORIGINAL INSPECTED