DE2335680A1 - Powder fire extinguishant system - has controls to open only one gas propellant container at a time - Google Patents

Abstract

Fire extinguishing system particularly for a mobile unit, has containers for powdered extinguished to be expelled by compressed gas, with a common extinguishant from their outlet valves each actuated by a hand switch and a control pressure medium. A control duct connects the outlet valves of the containers and conducts the control medium, and contains a controller actuated by the hand switches to permit the actuation of only one of the outlet valves at any given time. The duct may also contain a delay unit for the opening of an outlet valve until the previously open valve has closed.

Description

Paientanwölte Dipl.-Ing. W. Scherrmann Dr.-Ing. R. Rligcr

73 Esslingen (Neckar), Fabrikstrasse ? '■ Pjstfach 348 July 12, 1973 ^Tel " ^: '

Stuü j irt (0711) 35653?

PA 154 naha ³⁵⁹⁶¹⁹

Telegrams patent protection Esslingenneckar

Minimax GmbH, 206b Bad Oldesloe, Industriestraße 10-12

Fire extinguishing system with several containers for an extinguishing agent in powder form to be expelled by pressurized gas

The invention relates to a fire extinguishing system with several containers for a pressurized gas to be expelled, preferably powder extinguishing agent which has outlet valves leading to a common extinguishing line, which are to be actuated by a control pressure medium via this respectively assigned manual switch.

Larger fire extinguishing systems, in particular those in which dry extinguishing powder is used as extinguishing agent, often have several separate extinguishing agent containers for both technical and economic reasons. Fire extinguishing systems are therefore known in which the aforementioned arrangement is implemented. In such fire extinguishing systems, the first extinguishing agent container, while the insert is first deflated, while the second container is filled with pressurized gas before its use and, if appropriate only during the final phase of the emptying of the first container which serves for expelling the extinguishing agent _fSO £ _a ß _{he au} f this wis <is made ready for use. There is a risk that

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the pressurized gas intended only for the second container, e.g. via the common extinguishing line, also into the first completely or partially emptied container arrives and is thus distributed over both containers. the The consequence of this is that the pressurized gas, which is used to expel the extinguishing agent, closes one in the second container has low pressure and therefore oeiiu ejection of the extinguishing agent achieved neither sufficient coverage nor sufficient distribution. Object of the invention On the other hand, it is necessary to ensure that a second extinguishing agent container can only be put into operation if the extinguishing agent container previously in operation has been locked.

According to the invention, the aforementioned object is a Fire extinguishing system of the type mentioned above is achieved in that one of the outlet valves of the extinguishing agent container connecting control line leading the control pressure i.iedium contains a control device to be actuated by the manual switch for the outlet valves, each of which allows actuation of only one exhaust valve. The control line preferably also contains one as well by the manual switch for the exhaust valves to be actuated delay device, by which the opening of an exhaust valve Can be delayed until the previously open exhaust valve is closed.

The fire extinguishing system according to the invention, e.g. can be operated pneumatically or electrically, guarantees in any case that in each case in use one extinguishing agent container is no longer connected to another extinguishing agent container, so that the to expel the extinguishing agent from the extinguishing agent container to be used, do not pour the compressed gas into a

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empty extinguishing agent container can flow in.

According to a further feature _{> of} the invention, the outlet valves of the extinguishing agent container can only be switched by the control pressure medium if a special pressure gas line connecting the interior of the extinguishing agent container to them, preferably an expansion shock container and a non-return valve that can be opened in the direction of the outlet valve, is under pressure. In this way it is ensured that the outlet valve of the extinguishing agent container opens only then. if the pressurized gas serving as the propellant is under sufficient pressure in the extinguishing agent container and the extinguishing agent may have been loosened by the expansion shock.

According to a further feature of the invention is in the Pressurized gas lines with shut-off of their part leading to the extinguishing agent container a reaching the outlet valve Test pressure gas can be introduced. The compressed gas line preferably contains for this purpose a three-way valve, in the rest position of which the compressed gas line is unaffected and in its working position the test pressure gas source is connected to the associated outlet valve. With the help of the aforementioned arrangement it is possible to properly open and close the outlet valves without putting the system into operation check and thus determine whether the system is ready for operation.

In the drawing, an embodiment of the subject matter of the invention is shown. Show it:

1 shows a fire extinguishing system according to the invention in a schematic representation,

2 shows the control device belonging to the fire extinguishing system in an axial section,

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Fig. 3. the delay device belonging to the fire extinguishing system in an axial section,

4 shows a fire engine with a fire extinguishing system according to FIG. 1 in a side view and

5 shows the fire engine in a top view.

The spherical extinguishing agent containers 1 are shown in FIG. 1 and 2, which contain dry extinguishing powder, connected to the extinguishing line 5 via outlet lines 3 and 4. In the Outlet lines 3 and 4, outlet valves 6 and 7 are arranged, which the extinguishing agent container 1 and 2 in the idle state shut off against each other and against the extinguishing line 5.

A pressurized gas cylinder 8 or 9 is used to pressurize the extinguishing agent containers 1 and 2 Pressurized gas, e.g. air or nitrogen. The pressurized gas bottles B and 9 are connected to extinguishing agent tanks 1 and 2 by feed lines 10 and 11, respectively. In these are Reducing valves 12 and 13 are arranged.

The cylinder valves 14 and 15 of the compressed gas cylinders 8 and 9 are to be operated remotely pneumatically. The same applies to the outlet valves 6 and 7 of the extinguishing agent container 1 and 2. For this purpose, the cylinder valves 14 and 15 are assigned hand switches 16 and 17, respectively, while the Outlet valves 6 and 7 closed by manual switches 18 and 19 are actuated.

The control compressed gas used to control the valves is contained in a compressed gas storage container 20. Of this

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leads a line 21 to the manual switches 18 and 19 for the outlet valves 6 and 7 of the extinguishing agent container 1 and 2. The manual switchi8 is via a switching line 22 with the outlet valve 6 of the extinguishing agent container 1 and the manual switch 19 via a switching line 23 to the outlet valve 7 of the extinguishing agent container 2 in connection. The outlet valves 6 and 7 are connected to one another by a control line 24 which a control device 25 connected to the switching line 22. The control line 25 also contains a delay device 26 connected to the switching line 23.

The control device 25 has the structure and the effect of a flow valve and therefore contains in the Cylinder 27 has a piston 28 with a part 29 smaller Diameter and a part 30 of larger diameter. Accordingly, the cylinder 27 also contains a piston chamber 31 of smaller diameter and a piston chamber 32 of larger diameter. The piston / is at rest under the action of a compression spring 36, one on the opposite At the end of the piston 28, the shoulder 33 seated against the corresponding wall 34 at the end of the cylinder 27 applies. The piston part 29 of smaller diameter has a cylindrical recess 35.In the through this formed Cavity of the cylinder 27 opens in the rest position of the piston 28 by the hand switch 18 for the Outlet valve 6 incoming switching line 22. The continuation of this leading to the outlet valve 6 also goes Switching line 22 from the aforementioned cavity. The outlet valves open into the piston chamber 32 of larger diameter 6 and 7 connecting control line 24.

The delay device 26 (FIG. 3) also has the structure and mode of operation of a flow valve. However, it is set up so that the valve with

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Delay takes effect. It also contains a piston 38 with a part 3 9 smaller in the cylinder 37 Diameter and a part 40 of larger diameter. The cylinder 37 therefore again has a piston chamber 41 smaller diameter and a piston chamber 42 of larger diameter. The piston 38 is at rest under the action of a compression spring 43, one on the opposite End of the piston 3 8 seated shoulder 44 against the end wall 45 of the cylinder 37 applies. Of the Piston part 3 9 of smaller diameter in turn has a cylindrical recess 46. In the rest state of the delay device 26 opens into the part of the piston chamber 41 of smaller diameter containing the compression spring 43 the switching line 23 coming from the manual switch 19, while the continuation leading to the outlet valve 7 this switching line 23 extends from the cavity formed by the cylindrical recess 46. In the proportionate large-sized part 47 of the piston chamber 42, the extent of which is determined by the piston shoulder 44, opens the Control line 24 with a throttle bore 48.

The extinguishing agent containers 1 and 2 are each connected to the outlet valves 6 and 7 by an additional compressed gas line 49 or 50 connected. Each of these compressed gas lines initially contains an expansion shock container 51 or 52, then a three-way valve 53 or 54 and finally a check valve opening in the direction of the outlet valve 6 or 7 55 and 56, respectively. The two compressed gas lines 49 and 50 of the extinguishing agent containers 1 and 2 are in front of the outlet valves 6 and 7 connected by a ring line 57.

The mode of operation of the fire extinguishing system described and illustrated is as follows:

When the extinguishing agent container 1 is to be made ready for use, the manual switch 16 is actuated. As a result, it opens the control pressure gas coming from the pressurized gas reservoir 20 and flowing in via the line 21 passes through the cylinder valve

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the pressurized gas cylinder 8, and the propellant gas flows over the Feed line 10 and the reducing valve 12 in the extinguishing agent container 1 a.

When the pressure in the extinguishing agent container 1 has reached a certain value, the pressurized gas suddenly penetrates into the expansion shock container 51, for example by destroying a rupture disc by which this container is closed is. Due to the sudden expansion of the compressed gas in the container 51, an "expansion shock" is generated in the extinguishing agent container 1 in a known manner, which is used to loosen it of the dry extinguishing powder contained in your extinguishing agent container. The compressed gas from the extinguishing agent container 1 is then applied to the outlet valve 6.

To make the extinguishing agent container ready for use 2, the manual switch 17 is to be operated in a corresponding manner, which opens the bottle valve 15 and the influx of the pressurized gas from the pressurized gas cylinder 9 into the extinguishing agent container 2 results. After passing of the expansion shock container 52, the compressed gas flows from the extinguishing agent container 2 into the compressed gas line 50 and is present at the outlet valve 7 of the extinguishing agent container 2.

If the extinguishing agent container 1 is to be emptied during use, the manual switch 18 is actuated so that the control pressure gas reaches the outlet valve 22 via the switching line 22. The control device 25 allows this Flow of the control pressure gas because the piston 28 is in its rest position under the influence of the compression spring 36 and the control pressure gas can flow around the recess 35 of the piston part 29 of smaller diameter. Since now both the compressed gas from the switching line 22 and that from the compressed gas line 49 to the outlet valve of the If the extinguishing agent container is pending, it opens and the dry extinguishing powder flows out of the extinguishing agent container 1 into the extinguishing line 5.

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If the extinguishing agent container 2 is to be used, the stove switch 19 is actuated so that the control pressure gas enters the switching line 23. Via the control line 24 the control pressure gas influences the control device 25.

It acts here on the piston part 30 of larger diameter and therefore moves the piston 28 counter to the action of the compression spring 36 in such a way that the switching line 22 is interrupted and not at the outlet valve 6 of the extinguishing agent container 1 via the switching line 22 pressurized gas there is more to come. The outlet valve 6 therefore closes.

On the other hand, the control compressed gas contained in the compressed gas line SA due to the actuation of the manual switch 19 cannot pass the delay device 26 because the piston part 39 of smaller diameter in the delay device 26 separates the access and the outlet of the switching line 23 to the cylinder 37. On the other hand, the control pressure gas flows via the control line 24 and the throttle bore 48 in the end wall 45 of the cylinder 37 into the relatively large part 47 of the piston chamber 42. Since this inflow takes place via the throttle bore 48 and the pressurized gas must initially also fill the piston part space, it only acts on the piston part 40 of larger diameter with a delay. As a result, the piston part 38 is adjusted against the action of the compression spring 43 and as a result the path for the flow of the control pressure gas #t to the outlet valve 7 of the extinguishing agent container 2 is released, so that the outlet valve 7 now opens. The above-described mode of operation of the delay device 26 means that the outlet valve 7 in any case only opens when the outlet valve 6 of the other extinguishing agent container 1 is already closed.

If the two manual switches 18 and 19 are adjusted at the same time due to incorrect operation, the control pressure gas acts via the control line 24 to the control device 25

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a and locks by adjusting the piston 28 while acting on the piston part 30 of the larger diameter Flow of the control pressure gas through the switching line 22 to the outlet valve 6. Despite the operation of the hand switch 18, therefore, the outlet valve 6 does not open. On the other hand, after a delayed adjustment of the piston 3 8 in the delay device 26 by the pressure gas flowing in via the control line 24, the flow of the control pressure gas . Released in the switching line 23, so that the switching valve 7 of the extinguishing agent container 2 opens.

As is readily apparent, the control pressure gas acts via the control line 24 on the larger piston part 40 for as long Diameter of the delay device 26 and accordingly interrupts the flow of the control pressure gas through the Switching line 22 to the outlet valve 6 how the manual switch for the use of the extinguishing agent container 2 is operated. if Therefore, in the case of the aforementioned incorrect operation, the extinguishing agent container 1 must now also be used, the must first Manual switch 19 can be returned to the rest position, resulting in the immediate adjustment of the piston 28 in the control device 25 under the action of the compression spring 36 and thus the release of the switching line 22 and the opening of the Outlet valve 6 of the extinguishing agent container 1 results.

Because the two compressed gas lines 49 and 50 of the extinguishing agent containers 1 and 2 are in front of the outlet valves 6 and 7 are connected by a ring line 57, it is ensured that the outlet valves 6 and 7 also then from the pressure gas line 49 or 50 can be subjected to sufficient pressure when in the associated extinguishing agent container or 2 the pressure of the propellant gas has already dropped.

if necessary, it is therefore ensured that even among these iastänuen / the rest of the dry powder that is still in the extinguishing medium

- 10 -

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container remains, can be driven out. The check valves that only open in the direction of the outlet valves 6 or 7 55 and 56 in the compressed gas lines 49 and 50 ensure that again not compressed gas from the one extinguishing agent container can get into the other extinguishing agent container.

In fire extinguishing systems of the type described here, because they are often not used for a long time, especially with the outlet valves that are assigned to the extinguishing agent containers, there is a risk that they will either become stuck in the course of time or become leaky. It can therefore happen that such malfunctions are only detected when the fire is in use, ie when the fire is started. In order to practically rule out such disturbances, which can naturally have a dangerous effect, a test compressed gas can be introduced into the compressed gas line 49 and 50 via the three-way valves 53 and 54 when the fire extinguishing system is idle. While the three-way valves 53 and 54 in their normal position clear the passage for the compressed gas lines 49 and 50, in the test position they block the part of the compressed gas lines 49 and 50 leading to the extinguishing agent containers 1 or 2 and clear the way for a test compressed gas, which flows from an external source of compressed gas via the three-way valve and the check valve 55 and 56 to the outlet valve 6 and 7, respectively. In this way, by actuating the three-way valve, it can be checked whether the associated outlet valve opens and closes properly, with the associated manual switch 18 or 19 naturally having to be actuated at the same time. In this way, _f without the extinguishing agent container must be 1 and 2 filled with pressurized gas and made ready for use, a check of the exhaust valves for free movement and leakage and also the other valves possible for operability. This therefore avoids the risk of the valves failing in an emergency.

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"" II ""

A test arrangement of the aforementioned type is natural Can also be used with other types of fire extinguishing systems, if these only works with valves that are operated pneumatically.

A fire extinguishing system of the type described above and shown in FIGS. 1 to 3 type shown is in Fig. 4 and 5 aif a fire engine arranged. As the drawing shows, the extinguishing agent containers 1 and 2 with the associated expansion shock containers 51 and 52 mounted on an auxiliary frame 58, which in turn is mounted on the frame 59 of the chassis of the fire engine 61 is attached. By the way, they are too other components of the fire extinguishing system according to FIG. 1, which have the same reference numerals in FIGS. 4 and 5, on which Fire engine recognizable. The extinguishing line 5 of the vehicle leads to a known per se .. pivotable in all directions Powder thrower 62, with a jet pipe 63. On Most of the switching elements for the fire extinguishing system are arranged on a switch panel 64 on the side of the vehicle. In contrast, the manual switches 16 and 17 as well as are located on a further control panel 65 in front of the powder thrower 62 18 and 19 to establish operational readiness and to Inserting the extinguishing agent containers 1 and 2. .

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Claims (11)

Claims 1 · / Fire extinguishing system with several containers for one through Fire gas to be expelled, preferably powdery extinguishing agent, which have outlet valves leading to a common extinguishing line, which are respectively assigned via these Manual switches can be operated by a control pressure medium, characterized in that one of the outlet valves (6,7) the extinguishing agent container (1,2) connecting the control pressure medium leading control line (24) through the manual switch (18,19) for the outlet valves (6,7) to be actuated control device (25) contains, each of the actuation only allows one outlet valve (6,7). 2. Fire extinguishing system according to claim 1, characterized in that that the control line (24) is also operated by the manual switch (18, 19) for the outlet valves (6, 7) Contains delay device (26) by means of which the opening of an outlet valve (7) can be delayed until the previously open outlet valve (6) is closed. 3. Fire extinguishing system with two extinguishing agent containers according to claim 1, characterized in that the control device (25) consists of a flow valve controlled by a piston (28) of different diameters, which at Actuation of the first manual switch (18) for the outlet valve (6) of the first extinguishing agent container (1) the flow of the control pressure medium, but interrupts this flow path when actuating the second manual switch (19) for the outlet valve (7) of the second extinguishing agent container (2) the control pressure medium opposite the piston (28) takes effect. - 13 - 409885/1176 4. Fire extinguishing system according to claim 3, characterized in that that the piston (28) is held by a compression spring (36) in a position in which it by means of the first Hand switch (18) supplied Steueräruckraediuin in one of him free space (35) of the piston cylinder (27) can flow in and flow out of this again while he via the piston part (30) of larger diameter fed to him by means of the second land switch (19) Acting control pressure medium adjustable 4-st. 5. Fire extinguishing system according to claim 2, characterized in that that also the delay device (26) consists of a flow valve controlled by a piston (38) of different diameter exists that when the second hand switch is operated (19) first releases the flow for the control pressure medium for the outlet valve (6) of the second extinguishing agent container £ (2), when the piston (38) is under the influence of the control pressure medium has been adjusted with delay. 6. Fire extinguishing system according to claim 5, characterized in that the piston (38) by one in the region of its smaller Diameter v / effective compression spring (43) is held in a position in which it allows the flow of it over the second Hand switch (19) shuts off the supplied control pressure medium, while it is through the larger on the piston part (30) Diameter acting control pressure medium can be transferred with a delay into the flow-free position. 7. Fire extinguishing system according to claim 6, characterized in that the inlet opening (48) for the application of the Piston part (30) serving larger diameter control pressure medium designed as a throttle bore and that of the control pressure medium Before the piston (38) is influenced, the cylinder space (47) to be filled is relatively large. - 14 - 409885/1176 8. Fire extinguishing system according to claim 1, characterized in that the outlet valve (6, 7) of a ^ öschmittelbehälter (1, 2) through the control pressure medium can only be switched if a special, the interior of the extinguishing agent container (1,2) connecting with it, preferably an expansion shock container (51,52) and a in the direction of the outlet valve (6,7) to be opened check valve (55,56) containing pressure gas line (49,50) is under pressure. 9. Fire extinguishing system according to claim 8, characterized in that the individual extinguishing agent containers (1,2) assigned Pressurized gas lines (49, 50) are connected to one another via a ring line (57). 10. Fire extinguishing system according to claim 8, characterized in that in the compressed gas lines (49.50) with their shut-off a test pressure gas reaching the outlet valve (6,7) can be introduced to the extinguishing agent container (1,2). 11. Fire extinguishing system according to claim 10, characterized in that the compressed gas line (49.50) has a three-way valve (53.54) contains, in the rest position of which the pressure gas line (49,50) is unaffected and in its working position the test pressure gas source is connected to the outlet valve (6,7). 409885/1 176