EP1731770B1 - Pneumatic circuit for a smoke extraction and ventilation system - Google Patents

Abstract

An air reservoir primary valve (36) is fitted in a central housing. It is connected via only a single control line (37) to separate start-up buttons (18). The arrangement forms a series of manual start-up stations. On operating a smoke extraction button (18), the control line (37) is vented. Such venting causes changeover in position of the reservoir primary valve (36), from its initial position into a starting position.

Description

The invention relates to a pneumatic circuit arrangement for a smoke extraction and ventilation system with pneumatic cylinders according to the preamble of claim 1.

More specifically, the pneumatic circuit is provided for supplying pneumatic cylinders in a flue and ventilation system.

Conventional pneumatic smoke evacuation systems are powered either from CO ₂ cartridges or from compressed air tanks fed by compressors or from a reserve air tank provided in addition to storage tanks of a compressor. With the reserve air tank, the power supply should be secured even when the compressor fails and the usual storage tank is emptied, which takes over the energy supply to power the pneumatic cylinder during normal ventilation operation of a smoke extraction and ventilation system. In the smoke evacuation system or the smoke evacuation and ventilation system, the power supply of the pneumatic cylinder for the smoke extraction case must be done through pipes, so it can not easily be used hoses are used.

Furthermore, manual release stations over which usually the power supply of the pneumatic cylinder takes place in flue systems, housed in relatively large enclosures, which are expensive to manufacture, claim space during assembly according to their size and space on the one hand with the reserve air tank and on the other hand with the pneumatic cylinders connect.

On the other hand, according to the prior art known in practice in small, compact housings only valves with very low flow rate can be used, which therefore can only be used as control valves and can not be used directly to power the pneumatic cylinder. But these control valves must be connected to at least two lines, namely a supply line and a controlled line.

From the DE 43 42 117 A1 a pneumatic circuit arrangement of the type mentioned is known, which is fed with compressed air from a storage tank as a secondary air source and a compressor as a pressure medium source. Trigger stations in the form of temperature-dependent bursting elements are connected via a respective line to a control input of a fire protection valve, which is vented when a hazardous temperature is exceeded, so that the fire protection valve switches. As a result, a conduit from the reservoir and a conduit to a Verstellzylinderanordnung are connected to a sliding door with the atmosphere and the entire control and the secondary pressure medium source are vented so that the sliding door can be manually operated, which is otherwise brought by an adjusting cylinder in the open position, in the she usually remains. For this purpose, the pressure medium source is connected via the normally switched through fire protection valve. This circuit arrangement is for controlling a smoke extraction and ventilation system not suitable. It also has a high pressure medium consumption due to the venting of the entire system including the storage container in the case of release.

The present invention is therefore an object of the invention to provide a pneumatic circuit for supplying pneumatic cylinders in a flue system and in a flue and ventilation system, which consists of compact components that can be easily installed.

This object is achieved by the pneumatic circuit arrangement with the features of claim 1.

In these pneumatic circuit arrangements, only the reserve air priority valve via pipes on the one hand to be connected to the reserve air tank to be fed from this, and on the other hand to the pneumatic cylinder, in particular its opening side to be connected. The opening side of the pneumatic cylinder is understood to mean the side to be pressurized with compressed air to move a smoke vent or dome or the like to a smoke exhaust position. Conversely, when a closing side of the pneumatic cylinder is pressed, the smoke outlet flap is closed.

On the other hand, the other lines in the circuit arrangement, namely the pneumatic control lines between the reserve air priority valve and the release stations or smoke extraction buttons can be formed as hoses, in particular made of plastic, which can be laid easily and flexibly.

The smoke extraction buttons as release stations can be made very compact.

The smoke extractors are especially designed as manual buttons. But they can also be operated externally in other ways, in particular by an electric or electromagnetic actuation. The latter is particularly suitable for connection with sensors for automatically triggering the smoke extraction position of the smoke extraction system.

In any case, the remote from the reserve air priority valve smoke extractor button with that only via a single line in communication, which is a pneumatic control line for the reserve air priority valve is. The smoke extractor buttons do not need to be fed from the reserve air tanks or other compressed air supply, but are at the basic position of the reserve air priority valve under the prevailing in the Reserveluftvorrangverttil at a specific point, namely a first pressure chamber, prevailing pressure and control the reserve air priority valve by venting the first chamber or pressure reduction Operation of the smoke extraction button.

By bringing the smoke extractor button into a reset position, the line to the reserve air priority valve or the pneumatic control line is again blocked or sealed from the surrounding atmosphere.

The reserve air priority valve provided in this manner for pressurizing the pneumatic cylinders with compressed air is a piston valve whose essential features are specified in claim 1.

The spool valve can be in fluid communication with an additional, arbitrarily operable two-way valve in addition to the smoke extraction buttons in a smoke extraction and the storage tank of the compressor for adjusting the ventilation of the pneumatic cylinder or the pneumatic cylinder in the Rauchabzugs- and Ventilation system is powered.

Among the features of the compact piston valve as a reserve air priority valve according to claim 1 is a displaceable between the basic position and the release position in the housing of the spool valve spool with annular grooves, which faces away from each other opposite Pressure receiving sides adjacent to a first pressure chamber or to a second pressure chamber, wherein the first pressure chamber and the second pressure chamber are in throttled fluid conductive connection with each other. The housing of this spool valve also has a plurality of connection bores, namely a connection hole "reserve air tank", with which it can be connected to the reserve air tank, a connection hole "RWA on" and a connection hole "RWA", with it to an opening side or Furthermore, a connection hole "vent", which forms a vent for the closing side of the pneumatic cylinder or the pneumatic cylinder, further each a connection hole "ventilation on" or connection hole "ventilation to", with which it to outputs the above-mentioned, arbitrarily operable two-way valve for the ventilation function of the smoke extraction and ventilation system, which is also realized with the SHE flaps or domes, can be connected, and also a connection hole "smoke vent button" for connection to one of the above-mentioned smoke vent , The connection holes, the first pressure chamber and the second pressure chamber in the housing and the annular grooves in the piston valve are arranged so that in the basic position of the spool, in this at equal pressures in the first pressure chamber and in the second pressure chamber from a reset position out is set, the connection hole "reserve air tank" is connected to both pressure chambers via a respective throttle, the connection hole "smoke extraction button" is connected to the first pressure chamber, the connection hole "venting" of the pneumatic cylinder (s) is closed and the connection holes "ventilation on" and " Ventilation to "connected to the connection holes" RWA on "or" RWA closed ", whereby the pneumatic cylinder via the reserve air priority valve, but by this virtually unaffected, depending on the setting or actuation of the arbitrarily operable two-way valve either on the opening side or on the closing side of the pneumatic cylinder from the normal compressed air supply, ie the storage tank of a compressor, are pressurized with compressed air.

The spool valve is completed by return means of the spool, which are in fluid communication with the second pressure chamber in order to lower the pressure in this for returning the piston valve or to vent the second pressure chamber. The piston valve is then displaced by the pressure prevailing in the first pressure chamber in the direction of its rest position.

As a return means of the piston valve can be arranged according to claim 2 in the housing, an internal reset button, with which the second pressure chamber can be vented.

However, it is also possible to connect an external reset button to the housing of the reserve air priority valve, if this has a corresponding connection hole "reset button" according to claim 3, via which the second pressure chamber can be vented. The connection hole "Reset button" in the housing must be closed externally when not in use. Otherwise, the connection hole "Reset button" is locked in the basic position of the piston valve, so that it is not in this position in communication with the second pressure chamber.

According to claim 4, a connection hole "compressed air supply" can also be arranged in the housing of the reserve air priority valve, which can be connected to the storage container of the compressor, that is fed from the normal compressed air supply. The connection hole "Compressed air supply" in the housing and an annular groove in the spool are designed so that in the basic position of the spool the connection hole "compressed air supply" with the connection hole "reserve air tank" is connected. This ensures that in the initial position of the spool the reserve air tank is fed from the normal compressed air supply to be reliable for the triggering case ready. Between the connection bore "compressed air supply" and the housing on the one hand and the regular compressed air supply, especially the storage tank of the compressor on the other hand is expediently arranged according to claim 5, a check valve, which a backflow of compressed air from the reserve air tank in the event of a malfunction in the compressor and associated pressure vessel there causes a pressure drop prevented.

The spool valve which realizes the reserve air priority valve with the spool valve which is displaceable in the housing between the basic position and the release position and adjoins a first pressure chamber and a second pressure chamber at two opposite pressure receiving sides, is further designed with the features that the first and the second pressure chamber communicate with each other through a longitudinal bore in the spool and one each at each of the two ends of the longitudinal bore throttles, wherein in the longitudinal bore a transverse bore opens, which is connected to one of the annular grooves in the spool, which the connection bore " Compressed air supply "with the connection hole" reserve air tank "in the basic position of the piston valve can connect. As a result, the two pressure chambers are on the throttles, which can be easily designed as throttle holes, in the basic position of the spool both with the connection hole "compressed air supply" to Normal compressed air supply from the reservoir of the compressor as well as with the connection hole "reserve air tank" in conjunction. Thus, the equilibrium of high pressures in the two chambers for the basic position of the piston valve reliably sets. In addition, the reserve air tank is held by the spool valve in its normal position to the pressure of the regular compressed air supply.

The high pressure equilibrium between the two pressure chambers is only terminated when air escapes from the first pressure chamber by actuation of the smoke vent button via the connection bore "smoke outlet button" and thus the pressure in the first pressure chamber drops. As mentioned above, so that the existing pressure in the second pressure chamber push the spool valve in the release position. According to claim 7, the connecting hole "smoke vent button" and the spool on the first pressure chamber are expediently arranged so that the connection hole "smoke vent" is closed by the spool, if this by lowering the pressure in the first pressure chamber and thus adjusting pressure difference between its two pressure receiving sides is moved in the direction of the first pressure chamber. Closing the "Smoke Discharge Button" connection hole avoids further pressure loss in the first pressure chamber even if the smoke extractor button remains in the release position and thus in the venting position. Throttle holes between the two pressure chambers then flow via compressed air from the second pressure chamber into the first pressure chamber, so that a new equilibrium occurs at the piston valve, which strikes in the release position.

In all the embodiments of the spool valve described above, the connection hole "smoke exhaust probe" is closed by this in the release position, the connection hole "reserve air tank" connected to the connection hole "RWA open", the connection hole "RWA closed" connected to the ventilation, the connection hole "ventilation on "and the connection hole" Ventilation closed "locked, the connection hole" compressed air supply "closed and the connection hole" Reset button "connected to the second pressure chamber.

These connections ensure that the pneumatic cylinder forcibly moves the smoke extraction flap actuated by it into the open smoke extraction position.

The spool valve can be returned to its home position by pressing the internal reset button or the external reset button connected to the "Reset Button" connection hole after the smoke vent button is reset or the "Smoke Dump" connection hole is not vented by a Venting now takes place in the second pressure chamber, whereby the piston valve is automatically moved back into the normal position by the relatively higher pressure in the first pressure chamber.

As mentioned, a smoke extraction switch via the pneumatic control line to control the reserve air priority valve or spool valve in the release position. Since this control is done by pressure drop in the pneumatic control line, this can consist of a little expensive, easy to install plastic hose.

The spool valve with the above options is designed according to claim 8 as a 9/2 way valve.

For actuating the spool valve, a smoke extractor according to claim 9 is suitable, which comprises an arbitrarily actuable vent valve. The vent valve can be triggered manually in the flue case or electrically controlled with an electromagnetic actuator, optionally also remotely controlled and / or by a sensor.

In detail, such a smoke vent button in a compact, reliably operating embodiment comprises the features of claim 10, that the vent valve has a valve body with a lockable by a piston valve vent, that the spool is under the force of a return spring that in the smoke vent button against the Is mounted in a power take-off spring in the axial direction displaceable release button with a circumferential groove that in the flue trigger a reset lever plate is pivotally mounted about an axis which is oriented parallel to the axial direction of the release button that the reset lever plate rests on the one hand on the spool and on the other hand on the Trigger button is applied so that it can be pressed against the trigger return spring until the reset lever plate enters the circumferential groove of the release button and opens the vent.

The flat, low-assembly design of the smoke vent button is achieved according to claim 12, characterized in that the reset lever plate is arranged parallel to a base side of the housing, on which the release button can be mounted.

To reset the smoke vent button, the reset lever plate can be swung out of the circumferential groove of the release button according to claim 11.

Figur 1

einen Systemschaltplan der pneumatischen Schaltungsanordnung,

Figur 2

ein Reserveluftvorrangventil in Form eines 9/2 Wegeventils als Kolbenschieberventil in einem Längsschnitt in Grundstellung,

Figur 3

das Reserveluftvorrangventil gemäß Figur 2 in einer Schnittebene A-A in Figur 2,

Figur 4

das Reserveluftvorrangventil in einem Längsschnitt in Auslösestellung,

Figur 5

das Reserveluftvorrangventil gemäß Figur 4 in einer Schnittebene A-A in Figur 4,

Figur 6

einen Rachabzugstaster, der ein Rauchabzugsauslösetaster ist, in einem Schnitt senkrecht zur Auslöserichtung in unbetätigter Stellung,

Figur 7

den Rauchabzugstaster gemäß Figur 6 in einer Schnittebene B-B in Figur 6,

Figur 8

den Rauchabzugstaster in einem Schnitt senkrecht zur Auslöserichtung in betätigter Stellung und

Figur 9

den Rauchabzugstaster gemäß Figur 8 in einer Schnittebene B-B in Figur 8.

The essential components of the pneumatic circuit arrangement according to the invention are shown in the drawing with nine figures. It shows:

FIG. 1

a system diagram of the pneumatic circuitry,

FIG. 2

a reserve air priority valve in the form of a 9/2 way valve as a piston valve in a longitudinal section in basic position,

FIG. 3

the reserve air priority valve according to FIG. 2 in a sectional plane AA in FIG. 2 .

FIG. 4

the reserve air priority valve in a longitudinal section in the release position,

FIG. 5

the reserve air priority valve according to FIG. 4 in a sectional plane AA in FIG. 4 .

FIG. 6

a revenge trigger, which is a smoke extraction trigger button, in a section perpendicular to the release direction in the unactuated position,

FIG. 7

according to the smoke extraction button FIG. 6 in a sectional plane BB in FIG. 6 .

FIG. 8

the smoke vent button in a section perpendicular to the release direction in the actuated position and

FIG. 9

according to the smoke extraction button FIG. 8 in a sectional plane BB in FIG. 8 ,

In the system diagram FIG. 1 a combined smoke extraction and ventilation system is denoted by 31 a two-sided pneumatic cylinder, on each side CA or CZ for opening or closing a smoke exhaust flap, not shown, can be acted upon with compressed air. The pneumatic cylinder 31 may represent a group of such pneumatic cylinders in a smoke and heat exhaust system - RWA system - stand.

To supply the pneumatic cylinder 31 with compressed air, a connection point 32 is indicated, which is fed from a storage container, not shown, of a compressor for normal compressed air supply. With compressed air, which is taken from this connection point 32 can be acted upon by a pressure regulator 33 and a hand lever valve 34, which is a 5/2 way valve, the pneumatic cylinder 31 with compressed air for regular ventilation on the side CA, whereby the smoke exhaust flap moved into the ventilation position or the pneumatic cylinder 31 can move the SHE flap to the closed position by applying compressed air on the side CZ.

In that regard, the system shown in the system diagram is conventional and therefore need not be further described.

To supply compressed air to the pneumatic cylinder 31 in a smoke and heat exhaust case, this is done from a reserve air tank 35 as an accumulator. To control the flue and ventilation system smoke vent switches, one of which is symbolically represented by the reference numeral 18.

The smoke extraction buttons are connected at a central location with a special reserve air priority valve, which is a pressure-operated piston valve 36. To the spool valve 36 includes a reset button, which may be designed as an external button or as integrated in the spool valve internal reset button 17th

How out FIG. 1 can be seen, the spool valve connections for the compressed air supply to the junction 32, for an output of the 5/2 way valve 34 for acting on the pneumatic cylinder 31 on the opening side of the SHE flap and for an output of the 5/2 way valve to close the SHE flap and for corresponding connections between the spool valve 36 and the pneumatic cylinder, for the or the smoke vent button 18 and the pneumatic control line 37, for the reserve air tank 35, for a reset button and for a vent.

The spool valve 36 is a realization of a reserve air priming valve which generally causes actuation of at least one of the smoke vent buttons 18 in the smoke and heat venting case to pressurize the pneumatic cylinder 31 from the reserve air tank 35 to apply a SHE door or the like in the RWA position open, wherein the pneumatic cylinder is not powered by the 5/2 way valve or hand lever valve with energy directly from the normal compressed air supply to the junction 32. The compressed air supply of the pneumatic cylinder 31 takes place in the flue case via pipes made of steel or copper, which in FIG. 1 are shown by solid lines. On the other hand, pneumatic control lines 37 between the smoke extractor button 18 and the smoke vent buttons and the spool valve 36 can be realized by plastic hoses, which are shown by broken lines. Also for the energy supply the 5/2-way valve 34 and for feeding the spool valve 36 from the junction 32 via a check valve 8 can at least partially plastic hoses are used.

• In einem quaderförmigen Gehäuse 3, welches einen Ventilkörper darstellt, ist in einer zentralen, nicht bezeichneten Bohrung ein Kolbenschieber 4 gelagert, der aus zwei Teilen 4a und 4b, die fertigungsgünstig hergestellt werden können, zusammengesetzt ist.

Further details on the design of the spool valve 36 will be apparent from the FIGS. 2 to 5 , It is going on first FIG. 2 Reference is made, in which the spool valve is shown in a longitudinal section in the basic position:

• In a cuboidal housing 3, which is a valve body, a piston valve 4 is mounted in a central, not designated bore, which is composed of two parts 4a and 4b, which can be made low-priced, composed.

On each of the two oppositely facing end faces of the piston slide 4, a pressure chamber 1 or 2 is arranged, which adjoins a pressure receiving side 1a and 2a of the piston slide 4.

How out FIG. 2 further seen, the pressure chambers 1 and 2 are connected by a longitudinal bore 38 in the spool 4 and one throttle bore as a throttle 5 and 6 at both ends of the longitudinal bore 38 fluidly connected to each other. From the longitudinal bore 38 branches off a transverse bore 39 between the throttles 5 and 6, which opens into an annular groove 40 on the outer circumference of the piston slide 4.

From the piston slide in the longitudinal direction mutually offset further annular grooves 41, 42, 43 are formed, which can communicate with connection bores 7, 9, 10, 11, 13, 14, 15 in the housing 3 in fluid conductive connection, as in FIG. 2 shown in detail. Another connection hole 12 may communicate directly with the pressure chamber 1 in fluid conducting connection and a connection bore 16 with the second pressure chamber 2, see FIG. 4 , Non-designated annular seals dense portions of the spool, in particular between the annular grooves 40 to 43 and from the pressure chambers 1 and 2 from.

In the housing 3 of the spool valve, an internal reset button 17 is integrated, which includes a manually operable plunger 19, a spring 19 a and a sealing O-ring 20 and a recess 20 a, see FIG. 4 , with the pressure chamber 2 may be in communication when the spool is in the release position.

The latter also applies to the connection hole 1 6 for an external reset button, which is therefore referred to as a connection hole "reset button". It is to be closed when not in use.

The designations of the connection bores are subsequently supplemented with their functions or the components of the pneumatic circuit arrangement to be connected to them.

In the in FIG. 2 illustrated basic position of the spool 4 is the compressed air supply, from the junction 32 in FIG. 1 goes out, via the check valve 8 with the connection bore 7 "compressed air supply" in conjunction and this via the annular groove 40 with the connection bore 13 "reserve air tank", to which the reserve air tank is connected. Furthermore, these two pressure sources via the annular groove 40, the transverse bore 39 and the longitudinal bore 38 and in each case the throttle 5 and 6 are connected to the pressure chamber 1 and 2 respectively. Consequently, the pressures in the pressure chambers are equal to high pressures of the compressed air supply or the reserve air tank 35. The pressures press on the pressure receiving sides 1 a and 2 a the spool valve 4 in the illustrated basic position.

In this basic position, the connection bore 9 "ventilation on" is further connected to a corresponding output of the 5/2 way valve 34 and via the annular groove 41 with the connection bore 14 "RWA on", which communicates with the opening side CA of the pneumatic cylinder 31, see also FIG. 1 , Analogously, the connection bore 10, which is connected to the second outlet of the 5/2 directional control valve 34, is connected to the closing side CZ of the pneumatic cylinder 31 via the annular groove 42 and the connection bore 15 "RWA closed." Opening and closing the flap connected to the pneumatic cylinder can thus be effected for regular ventilation by the manually operated 5/2 way valve via the set in the initial position spool valve 36, which at the same time the pressure energy supply of the pneumatic cylinder 31 from the connection point 32 takes place.

The connection bore 11 "venting", which can serve to vent the pneumatic cylinder 31 on the closing side CZ, is closed in this case.

In the case of smoke and heat venting, the pressure chamber 1 connected to the connection bore 12 "smoke extraction button" is vented by a smoke vent button 18 connected to the connection bore 12, whereby the pressure in the pressure chamber 1 becomes lower than the pressure in the pressure chamber 2 and the piston slide 4 to the left is postponed to his trigger position. It closes the connection hole 12 "Smoke extraction button" so that no further pressure drop and compressed air loss occur. Rather, via the throttles 5 and 6 compressed air flows into the first Pressure chamber 1 from the second pressure chamber 2 after, adjusting a new pressure balance. The pressure in the first pressure chamber 1 can serve to restore the piston slide 4. The reset is, as mentioned above, carried out by pressing the internal reset button 17 or connected to the connection hole 16 "Reset button" external reset button.

In the set before the reset of the piston valve 4 release position is achieved in particular that the pressure from the reserve air tank 35 propagates to the connection bore 13 "reserve air tank" via the annular groove 41 and the connection bore 14 "RWA on" to the opening side CA of the pneumatic cylinder 31, the RWA flap moves safely into the SHE opening position. In this case, the side CZ of the pneumatic cylinder 31 can be vented via the connection bore 15 "RWA", the annular groove 43 and the connection bore 11 "venting". The connection hole 9 "ventilation on" and the connection bore 10 "ventilation to" are locked, however.

The spool valve 36 described above as a reserve air priority valve works with a special smoke vent button or more smoke vent buttons as a trigger button together, each of which can be accommodated in a very compact housing. An embodiment of the trigger button is described below with reference to FIGS. 6 to 9 described. Figures 6 and 7 show views of the smoke vent button in the ready position, and the FIGS. 8 and 9 This smoke vent button in tripped position or vent position.

With the smoke vent button is a venting of the first pressure chamber 1 of the spool valve 36 via the pneumatic control line 37, preferably a plastic tube, see FIG. 1 , The pneumatic control line 37 is connected to a connection 44 of the smoke vent button, which is designated by 18. The smoke extractor has as weseitliches functional element a vent valve which comprises a provided with a vent opening 24 valve body 25 and a valve under pressure of a return spring piston valve 27 which normally closes the vent opening 24 with respect to the terminal 44. The piston slide 27 and the slide return spring 26 are arranged substantially parallel to a base side 30 on which the smoke extraction button 18 comes to rest when mounted on a building or the like.

Also parallel to the base side 30, a reset lever plate 23 is pivotally mounted about an axis 28 in the smoke vent button 18. An arm 23 a of the reset lever plate abuts against an end face of the spool valve 27 and holds it in the in the FIGS. 6 and 7 shown operating provision, in which the vent valve is closed with the spool 27 when a relation to the first arm 23 a spatially unwound second arm 23 b of the reset lever plate rests against an outer periphery of a release button 21, as in the FIGS. 6 and 7 shown.

The reset lever plate 23 is pivotally mounted about an axis 28 which is oriented perpendicular to the base side 30. Also perpendicular to the base side and thus parallel to the axis 28 of the trigger button 21 is mounted in the smoke vent button 18, which by a trigger return spring 22 in the in FIG. 7 shown operation provision to the right, that is kept pressed outward.

In the case of smoke extraction, the smoke vent button 18 is manually operated by depressing the release button 21, whereby the second arm 23b of the reset lever plate 23 can be engaged in a circumferential groove in the release button 21, see FIGS. 8 and 9 because the first arm 23a of the reset lever plate 23 is moved by the slide return spring 26 to the right or clockwise about the axis 28. Because in this case the spool 27 is pushed to the right by the slide return spring 26, the vent valve opens and releases the vent 24 to which a muffler may be located.

To reset the smoke vent button 18 from the triggered position or venting position again, the reset approach 23c is moved by a tool down or counterclockwise, against the force of the slide return spring 26. As soon as this movement of the second arm 23b of the reset lever plate 23 is pivoted out of the circumferential groove 45 of the release button, the release button is again by the release return spring 22 to the outside back, and the flue button 18 resumes its operation according to the provision FIGS. 6 and 7 one.

LIST OF REFERENCE NUMBERS

1

(Pressure) chamber

1 a

Pressure receiving side

2

(Pressure) chamber

2a

Pressure receiving side

3

Housing (valve body)

4

spool

4a, 4b

Parts of the piston valve

5

throttle

6

throttle

7

Connection bore "compressed air supply"

8th

check valve

9

Connection hole "Ventilation on"

10

Connection bore "ventilation to"

11

Connecting bore "venting"

12

Connection bore "Smoke extraction probe"

13

Connection hole "reserve air tank"

14

Connection bore "RWA on"

15

Connection bore "RWA closed"

16

Connection hole "Reset button"

17

internal reset button

18

Smoke extraction button (release button)

19

tappet

19a

feather

20

O-ring

20a

recess

21

release button

22

Trigger return spring

23

Reset lever plate

23a

first arm

23b

second arm

23c

Reset approach

24

vent

25

valve body

26

Slide return spring

27

spool

28

axis

29

casing

30

base side

31

pneumatic cylinder

32

Connection point compressed air supply

33

pressure regulator

34

5/2 way valve (hand lever valve)

35

Reserve air tank

36

Piston spool valve (reserve air priority valve)

37

pneumatic control line

38

longitudinal bore

39

cross hole

40

ring groove

41

ring groove

42

ring groove

43

ring groove

44

Connection control line

45

circumferential groove

Claims (12)

1. Pneumatic circuit for a smoke extraction and ventilation system including pneumatic cylinders (31), including compressed air from a storage container of a compressor or from a reserve air container (35), including release stations, wherein in a central housing (3) a reserve air priority valve is disposed and is connected with separate smoke extraction operators (18) as release stations via only one single pneumatic control line (37) each, wherein said smoke extraction operator (18) is suited in each case when actuated to ventilate said pneumatic control line (37), and wherein said reserve air priority valve (36) is reversible from a normal position into a release position,
   characterized in
   that said reserve air priority valve (36) is a compressed-air actuated piston valve,
   that for the supply of said pneumatic cylinders (31), said piston valve (36) comprises a sleeve valve (4) including annular slots (40 - 43) movable in said housing (3) between said normal position and
   said release position, said sleeve valve (4) bordering on two opposite pressure receiving sides (1a, 2a) averted relative to each other against a first pressure chamber (1) and a second pressure chamber (2), respectively,
   that said first pressure chamber (1) and said second pressure chamber (2) are connected in fluid conducting manner via valves (5, 6) and can be filled with compressed air,
   that said housing (3) of said piston valve has a "reserve air container" connection bore (13) by means of which it can be connected to said reserve air container (35),
   that said housing (3) of said piston valve has an "RWA open" connection bore (14) and an "RWA (smoke and heat extraction) closed" connection bore (15) by means of which it can be connected to an opening side (CA) and to a closing side (CZ) of one pneumatic cylinder (31) each,
   that said housing (3) includes a "ventilation" connection bore (11) which forms a ventilation opening for said closing side (CZ) of said pneumatic cylinder (31),
   that said housing (3) includes one "ventilation open" connection bore (9) and one "ventilation closed" connection bore (10) each by means of which it can be connected to the outputs of any two-way valve (34) that can randomly be actuated which is fed from said storage container of said compressor and which serves for a ventilation adjustment of said smoke extraction and ventilation system,
   that said first pressure chamber (1) can be connected via a "smoke extraction operator" connection bore (12) with a ventilating/pressure lowering smoke extraction operator (18) as release operator,
   that said connection bores (9 - 15) and said pressure chambers (1, 2) in said housing (3) as well as said annular slots (40 - 43) in said sleeve valve (4) are so arranged that
   in the normal position of said sleeve valve (4) to which it is set with the same pressures in said first pressure chamber (1) and said second pressure chamber (2),
   said "reserve air container" connection bore (13) is connected with the two pressure chambers (1, 2) via a pressure lowering valve each,
   said "smoke extraction operator" connection bore (12) is connected with said first pressure chamber (1),
   said "ventilation" connection bore (11) is closed and said "ventilation open" connection bore (9) and said "ventilation closed" bore (10) are connected with said "RWA open" connection bore and said "RWA closed" bore (18), respectively,
   and in one release position of said sleeve valve (4) for which the pressure in said first pressure chamber (1) is lowered by actuation of said smoke extraction operator (18),
   said "reserve air container" connection bore (13) is connected with said "RWA open" connection bore (14),
   said "RWA closed" connection bore (15) is connected with said "ventilation" connection bore (11),
   said "ventilation open" connection bore 9 and said "ventilation closed" bore (10) are locked,
   and reset means of said sleeve valve (4) are in fluid conducting connection with said second pressure chamber (2).
2. Pneumatic circuit according to claim 1,
   characterized in
   that as said reset means of said sleeve valve (4), an internal reset operator (17) is disposed which is suited to ventilate said second pressure chamber (2).
3. Pneumatic circuit according to claim 1 or 2,
   characterized in
   that said reset means of said sleeve valve (4) comprise a "reset operator" connection bore (16) in said housing to which bore an external reset operator can be connected which is suited to ventilate said second pressure chamber (2).
4. Pneumatic circuit according to one of claims 1 through 3,
   characterized in
   that in said housing (3), a "compressed air supply" connection bore (7) is provided which can be connected with said storage container of said compressor, and
   that said "compressed air supply" connection bore (7) in said housing (3) and an annular slot (40) are formed in said sleeve valve (4) so that in the normal position of said sleeve valve (4) said "compressed air supply" connection bore (7) is connected with said "reserve air container" connection bore (13).
5. Pneumatic circuit according to claim 4,
   characterized in
   that between said "compressed air supply" connection bore (7) and said storage container of said compressor, a check valve (8) is disposed.
6. Pneumatic circuit according to one of claims 1 through 5,
   characterized in
   that said first and said second pressure chamber (1, 2) are connected with one another by a longitudinal bore (38) in said sleeve valve (4) and one valve (5, 6) each disposed at the two ends of said longitudinal bore, and
   and that into said longitudinal bore (38), a cross bore (39) opens which is connected with one (40) of said annular slots in said sleeve valve (4) which is suited to connect said "compressed air supply" connection bore (7) with said "reserve air container" connection bore (13) in the normal position of said sleeve valve (4).
7. Pneumatic circuit according to one of claims 1 through 6,
   characterized in
   that said "smoke extraction operator" connection bore (12) and said sleeve valve (4) on said first pressure chamber are so provided that said "smoke extraction operator" connection bore is closed by said sleeve valve when by actuating said smoke extraction operator (18) and by lowering of the pressure in said first pressure chamber (1) said sleeve valve is pushed into the release position.
8. Pneumatic circuit according to one of claims 1 through 7,
   characterized by
   a 9/2 way valve as said piston valve (36).
9. Pneumatic circuit according to one of the foregoing claims,
   characterized in
   that said smoke extraction operator (18) comprises a ventilation valve that can externally be actuated.
10. Pneumatic circuit according to claim 9,
    characterized in
    that said ventilation valve includes a valve body (25) having a ventilation (24) that can be locked by a sleeve valve (27),
    that said sleeve valve (27) is loaded with a valve reset spring (26),
    that in said smoke extraction operator (18) a release button (21) having a circumferential groove (45) is supported which can be moved contrary to the force of a release reset spring (22) in axial direction,
    that in said smoke extraction operator (18) a reset lever plate (23) is pivotally supported about an axis (28) which is oriented in parallel to the axial direction of said release button (21),
    that said reset lever plate (23) rests, on one side, against said sleeve valve (27) and, on the other side, against said release button (21) such that said release button (21) can be pressed in against said release reset spring (22) until said reset lever plate (23) engages in said circumferential groove (45) of said release button (21) and opens ventilation (24).
11. Pneumatic circuit according to claim 10,
    characterized in
    that in order to reset said smoke extraction operator (18), said reset lever plate (23) can be moved out from said circumferential groove (45).
12. Pneumatic circuit according to claim 10 or 11,
    characterized in
    that said reset lever plate (23) is disposed in parallel to one base side (30) of said housing.

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