DE102007049588B4 - Electrically controlled quick exhaust for a dry tube network with sprinklers - Google Patents

Abstract

Electrically controlled quick air vent for a dry pipe network with sprinklers for fire extinguishing systems, consisting of pipelines, the sprinklers, dry alarm valve, water supply, and compressed air supply (25), with at least one normally closed pilot operated solenoid valve (22) being arranged on the respective dry pipe network (29) with sprinklers and by means of a pressure switch (23a) on the alarm channel (26) of the upstream dry alarm valve (1) with a control center (30) triggered in a time-controlled manner and remains open until the compressed air in the respective drying pipe network (29) is discharged, the opening time of each solenoid valve (22) is determined and adjusted depending on the respective drying pipe network (29).

Description

The invention relates to an electrically controlled quick breather for a drying pipe network with sprinklers for fire extinguishing systems according to the features of the first claim.

The invention is suitable for dry systems with large pipe networks, even those in which the fire extinguishing foam is added, so that mechanical quick breather are not or only partially used because of their sensitive function, as they stick or clog and thus no longer work properly or water residues in the Drying system can lead to premature closure of the valve.

Dry nets for fire extinguishing systems are used particularly where, due to the risk of frost, pipeline networks can not be filled with water. Therefore, they have a relatively long "reaction time" due to the system.

In DE 23 45 318 A1 a wet sprinkler system for large cold stores is described, which is operated with a water pressure boilers. It is cheaper to operate these extinguishing systems with dry nets.

DE 203 00 772 U1 describes a drying network for fire extinguishing systems, consisting of a water supply, a dry alarm valve, the pressure network with extinguishing nozzles and a compressed gas supplier or pressure generator, with compressed air is connected to the lines of the nitrogen network with a nitrogen generator. Such dry sprinkler meshes require for venting the pipe network and the lines that are filled with gaseous medium, rapid exhaust stations, by their rapid release, it is possible that the pressure is removed from the pipeline network, so that it can be filled quickly with water or other liquid ,

In DE 31 33 410 A1 a dry extinguishing system is described with a sprinkler dry system, from which the air in case of fire via a vent valve with safety valve drained, or the air in the sprinkler lines, which does not exit via the open sprinkler, is passed into buffer zones. The system, which is installed after the main sprinkler line of the pipe network to be vented, opens as soon as the preset pressure of the safety valve is exceeded by water flowing into the pipe network. As a result, the compressed air is discharged via a vertically arranged vent valve with the downstream safety valve. As soon as the extinguishing medium enters the breather valve, it lifts a ball installed in the breather valve and thus closes the connection to the safety valve. A disadvantage of this venting system is that when clamping the float ball, the system can not be closed or not fully opened. Furthermore, it is disadvantageous that the pipe network pressure can not fall below the set pressure of the safety valve.

DE 295 09 755 U1 describes a quick exhaust station in the drying plant, but which has a fairly high trip time, so that closing the vent station does not occur immediately, which has an increased water consumption.

A quick exhaust station in a drying pipe network is in DE 297 09 277 U1 described, with this station and this system has the disadvantage that degrade the function of the quick exhaust in foam mixtures and in the presence of water sacs in the piping system may occur premature closing of the valve, so that extinguishing water does not reach the fire quickly and reliably.

DE 196 01 777 A1 describes an electrically controlled differential pressure switch, which measures a pressure drop in the sprinkler pipe network and sends it as a control signal to a control unit. At the same time there is an electrically controlled quick exhaust in the sprinkler pipeline. It is further provided that the electrical control unit evaluates a float signal, by which the pressure drop in the pipeline network is detected. The control center is an electronic control center, which is controlled by a microprocessor. The solenoid valve for venting is controlled by a timed control unit, wherein the control unit simultaneously opens two solenoid valves, wherein it is the one solenoid valve to the vent valve and the other solenoid valve is the valve which opens the extinguishing valve.

DE 199 36 454 A1 describes a method for operating a sprinkler system in a cold store. In case of response of one or more sprinklers, the quick-opening flap will only be opened if at the same time a fire detector has reported fire to a fire alarm control panel. In the event of leaks in the sprinkler piping network, the gas loss is compensated via the connecting line without the quick-opening flap being opened.

DE 100 15 030 A1 describes a quick exhaust station for venting of dry tube networks of sprinkler systems in the event of fire, which is characterized in that a solenoid valve in the control line to the diaphragm chamber of the Quick opener is arranged, whereby the diaphragm chamber and thus the control chamber is relieved of pressure on the diaphragm valve in a direct way and opens the diaphragm valve, whereby the Sprinklerrohrnetz can be vented faster.

Based on this prior art, it is an object of the invention to develop a quick exhaust fan for dry nets with sprinklers for fire extinguishing systems, which dissipates the triggering of a sprinkler, the compressed air from the drying pipe network until the system is filled with extinguishing agent, even if Schaumzumischungen extinguishing water be used or if in the drying pipe network extinguishing water residues are present, which are entrained in the quick exhaust during the venting time.

This object is achieved by an electrically controlled quick exhaust for a drying pipe network with sprinklers for fire extinguishing systems according to the features of the first claim.

Subclaims give advantageous embodiments of the invention again.

The solution according to the invention provides an electrical quick-ventilator for a dry-type network with sprinklers for fire-extinguishing systems, wherein a dry-alarm valve is arranged on one side of the dry-tube network and a solenoid valve at one or more suitable locations. The solenoid valve is to be dimensioned so large that the drying pipe network can be almost completely filled with extinguishing water in the desired time. It may, for example, be provided with a nominal diameter of 50 mm. Preferably, a pilot operated solenoid valve with 3/2-way pilot control (hinged armature pilot valve) is used. The particular advantage is that in open switching position no medium such as compressed air or fire water flows through the pilot control and thus the risk of clogged control bores due to contaminated media is very low. In addition, the armature is protected from harmful influences by a membrane.

It is also a normally closed (NC = normally closed) to use valve to prevent the valve in the idle state consumes much energy, and in the event of an electrical failure, such. B. in case of power failure, safely go to the closed position. This ensures that, even in the event of a power failure, extinguishing water does not continuously escape from the sprinkler piping network, which would prevent the sprinkler from being supplied. It can be a solenoid valve 24 V NC, to allow battery backup via a standard fire alarm panel. The solenoid valve is opened by means of a control panel for a defined time. The opening time of the solenoid valve can be determined and adjusted before or after completion of the pipe network for the respective drying pipe network. The time is preferably chosen so that the solenoid valve is closed immediately before the time at which the extinguishing water arrives at the location of the drying tube network on which the solenoid valve is installed. When using multiple solenoid valves in a drying pipe network, different solenoid valves may have different opening times.

The solenoid valve is triggered by an additional pressure switch which is mounted directly on the alarm channel of the dry alarm valve station, in addition to the one already present there. This can optionally be done with shut-off. The use of the additional pressure switch, which is installed in a place that is not pressurized during the regular alarm test, but only in an actual trip, minimizes the risk of accidentally triggering the quick breather during the regular alarm test.

So that the function of the solenoid valve is not endangered by contaminants entrained in the venting of the drying pipe network, it is advantageous to connect a filter upstream of the solenoid valve. This can be installed in the main flow of the solenoid valve or preferably outside the main flow in the region of the pilot control channels. It is furthermore advantageous to connect a separator downstream of the quick-acting ventilator, which separates any water entrained in the air flow from the air in order to be able to discharge the two media separately. Furthermore, it is advisable to arrange an element near the solenoid valve, with the aid of which, in the case of an incorrect timing at the control center, the solenoid valve is closed, as long as the drying tube network is completely vented. For this purpose, a responsive to the presence of water sensor such as a level indicator, a float switch, etc. may be installed, or there is another pressure switch arranged, which responds to the pressure increase, which occurs when the drying tube network completely filled with water and there adjusts the pressure supplied by the pumps. The use of a pressure switch is preferred because eleven such switch is triggered neither by occasionally entrained from the drying pipe network water nor by foaming when inflating water-foaming agent mixture. In the case of sensors reacting to level, this possibility would exist, which could then lead to an early closing signal from the sensor to the control unit and thus to an incomplete venting of the dry tube network.

To check the function and to adapt the pressure switch to the water supply pressure present in the respective system, it is also advantageous to connect a pressure gauge to the pressure switch. Between pressure switch and Manometer can be a delay element, z. As a container can be arranged. In order to install the additional components on the dry pipe network quickly and possibly also subsequently, a mold tube has proved advantageous, which can be fastened by means of pipe coupling to the sprinkler network, and has all the necessary connections. A shut-off flushing connection is provided on the forming tube, with which it is possible to flush out residual foam from the solenoid valve and thus minimize the risk of sticking of the valve. Furthermore, it is advantageous to connect a shut-off device to the forming tube in order to be able to rinse the magnetic valve without having to flood the drying tube network and to be able to carry out maintenance and inspection work without influencing the drying tube network.

In order to enable a quick electrical connection of the additional components, a terminal box is preferably installed on the forming tube, which is already connected to the electrical components such as solenoid valve, pressure switch and monitoring switch for the obturator, so that after installation of the assembly form tube on site only the wiring to Control Center must be established.

The solution according to the invention has the advantage that dry tube networks for fire extinguishing systems with sprinklers can be quickly and safely vented so long even when Schaumzumischungen in the fire water and entrained extinguishing water residues from the drying pipe network until the entire pipeline network is filled with extinguishing agent.

In the following the invention will be explained in more detail with reference to two figures and one embodiment. The figures show:

1 : Dry alarm valve and arrangement of the pressure switch

2 : Drying system with dry alarm valve and solenoid valve and separator.

The 1 shows the dry alarm valve 1 under which the slider 3 is arranged and a ball valve 16 for emptying. Furthermore, the check valve is on a line 6 , the ball valve 7 with the compressed air supply, the ball valve 8th and the manometer 9 arranged to the sprinkler pipe network. Furthermore, there is the ball valve 10 with pressure gauge 11 the water supply, the ball valve 20 and the vent valve 21 at the plant. Between 3/2-way tap 4 with bleeder valve 5 and the quick-opener 17 with pressure gauge 18 a line is arranged, at which the pressure switch 23a located. Under the quick-release 17 there is a ball valve 19 for drainage and an alarm pressure switch 12 ,

The 2 shows the dry alarm valve 1 , from the piping with sprinklers of the sprinkler system 29 are arranged, wherein at the end of the solenoid valve 22 is arranged. The solenoid valve 22 follows the separator 24 , where the pipe coupling 31 between the separator 24 and the solenoid valve 22 are arranged. The separator 24 serves to air and residual water after triggering the solenoid valve 22 to remove. Foam can by means of the valve 33 at the flushing connection 35 for foam from the forming tube 38 be removed. Due to fire heat, one or more sprinklers in the sprinkler system are triggered 29 and a pressure drop. This leads to the opening of the valve disk 2 in the alarm valve 1 ,

At a response of the alarm valve 1 is via the pressure switch 23a a signal to the control center 30 given, in turn, the solenoid valve 22 on the quick-ventilator unit opens for a defined time.

The electrical lines are all monitored for wire break and short circuit and via the control center 30 emergency power supply.

The extinguishing water now enters the pressure-relieved pipe network almost unhindered 29 one. The required opening time for the solenoid valve 22 is different or known for each plant. Once this time, which has been determined by experiments, has expired, the solenoid valve 22 closed again, so that more extinguishing water can only flow through the sprinklers. A premature closure by residual water is in the timed solenoid valve 22 not possible. Other important for the function of the system parts are in the 2 located.

LIST OF REFERENCE NUMBERS

1

Dry Valve

2

valve disc

3

pusher

4

3/2-way valve

5

drain valve

6

check valve

7

Ball valve, compressed air supply

8th

Ball valve, Man.-stopcock

9

Pressure gauge, sprinkler pipe network

10

Ball valve, Man.-stopcock

11

Pressure gauge, water supply

12

Alarm Pressure Switch

13

strainer

14

throttle

15

alarm bell

16

Ball valve, draining

17

Accelerator

18

Pressure gauge, quick-opener

19

Ball valve, drainage

20

Ball valve, line quick-release

21

vent valve

22

magnetic valve

23

pressure switch

23a

additional pressure switch

24

separator

25

Compressed air supply

26

alarm channel

27

water supply

28

Alarm bells line

29

sprinkler

30

control Center

31

pipe coupling

32

terminal box

33

Valve for flushing device

34

delay reservoir

35

Flushing connection

36

Ball valve, monitored

37

manometer

38

forming tube

Claims (8)

Electrically controlled quick exhaust for a dry tube network with sprinklers for fire extinguishing systems, consisting of piping, the sprinklers, dry alarm valve, water supply, and compressed air feed ( 25 ), whereby at the respective drying pipe network ( 29 ) with sprinklers at least one normally closed pilot operated solenoid valve ( 22 ) is arranged and by means of a pressure switch ( 23a ) on the alarm channel ( 26 ) of the upstream dry alarm valve ( 1 ) with a control center ( 30 ) is time-controlled and remains open until the compressed air in the respective drying pipe network ( 29 ), wherein the opening time of each solenoid valve ( 22 ) depending on the respective drying pipe network ( 29 ) is determined and set. Electrically controlled quick-vent for a dry-tube network according to claim 1, characterized in that the solenoid valve ( 22 ) has a nominal diameter of 50 mm. Electrically controlled rapid exhaust fan for a drying pipe network according to claims 1 to 2, characterized in that the solenoid valve ( 22 ) a separator ( 24 ) is connected downstream. Electrically controlled rapid exhaust fan for a drying pipe network according to claims 1 to 3, characterized in that the solenoid valve ( 22 ) is preceded by a filter. Electrically controlled rapid exhaust fan for a drying pipe network according to claim 4, characterized in that the filter is arranged in the region of the pilot control channels. Electrically controlled rapid exhaust fan for a drying pipe network according to claims 1 to 5, characterized in that in front of the solenoid valve ( 22 ) another pressure switch ( 23 ) a pressure gauge ( 37 ) is arranged. An electrically controlled rapid exhaust fan for a drying pipe network according to claim 6, characterized in that the pressure switch ( 23 ) or the sensor a delay container ( 34 ) and possibly a pressure gauge ( 37 ) are connected upstream. Electrically controlled rapid exhaust fan for a drying pipe network according to one of the claims 1 to 7, characterized in that in front of the solenoid valve ( 22 ) a forming tube ( 38 ) with a valve ( 33 ) to a flushing connection ( 35 ) is arranged.

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