EP2739887A1

EP2739887A1 - Explosion protection device for explosion-decoupling of two parts of a plant

Info

Publication number: EP2739887A1
Application number: EP12755954.0A
Authority: EP
Inventors: Peter Reitinger
Original assignee: Reitinger Engineering Dipl-Ing Peter Reitinger
Current assignee: Reitinger Engineering Dipl-Ing Peter Reitinger
Priority date: 2011-08-02
Filing date: 2012-08-01
Publication date: 2014-06-11
Also published as: WO2013017274A1; DE102011109154B3

Abstract

The invention relates to an explosion protection device for the explosion-decoupling of two parts of a plant, which are connected to each other by a pipeline in which explosive dusts or gases are conveyed. To this end, a tubular element (1) is arranged within the pipeline, in which element at least one closing flap (2, 3) is fixed such that it can pivot and, in the event that an explosive pressure occurs, changes to a closed position and lies against a sealing stop (12, 13) in the tubular element (1). The invention is characterized in that the tubular element (1) contains an inlet opening (6) having a first closing flap (2) and an outlet opening (7) spaced apart axially having an axially opposite second closing flap (3). In the delivery state, the two closing flaps (2, 3) are fixed in such a way in that they lie against each other at the opposite closing edges (5) thereof, such that said flaps form a continuous side wall of the tubular element (1) and, inclined slightly obliquely at an obtuse angle in relation to each other, project into the axial flow area of the tubular element (1) and, in the event of an increase in pressure caused by an explosion, the closing flap (2, 3) lying closest to the location of the explosion is pivoted in the outward direction and the other closing flap (2, 3) is pivoted in the direction of the inner pipe toward the closed position against a stop (12, 13).

Description

Explosion protection device for explosive decoupling of two system components

The invention relates to an explosion protection device for explosive decoupling of two parts of the plant according to the preamble of claim 1. In industrial or commercial plants are often dust-laden materials by means of piping of a

System part transported to a subsequent part of the system. For this purpose, pneumatic conveying systems are often used, where easily explosive air and particle distributions

which can cause explosions in the system components or pipelines. For pressure relief explosion protection flaps or rupture discs are provided, which indeed direct the explosion pressure to the outside to the atmosphere, but can not always prevent a spread of the explosion within the system. That's why in these

explosion-prone pneumatic conveyor systems frequently

Explosion protection devices used, the

To prevent explosion propagation in the conveying direction. Such a device for explosion-technical

Decoupling of two system components in a dedusting system is previously known from DE 10 2007 010 060 B3. The explosive dusts in a stream of air from a

Detection point supplied via a pipeline to a separator containing a rupture disc for pressure relief. To prevent the propagation of an explosion in the

Separator in the direction of the detection point is mounted in the pipe system between these two parts of the plant a non-return valve for explosion-decoupling, which in an explosion-induced pressure in the separator automatically

CONFIRMATION COPY Pipeline closes in the direction of the detection point. For this purpose, a pipe body is installed in the connecting pipe system, which contains a housing whose cross section is larger than that

Pipe diameter is. In this tubular body, a circular pipe socket is inserted with a stop, of a

Non-return valve is closed. This check valve is articulated above the pipe socket, so that it is pivoted in the normal conveying operation of the flowing pneumatic air flow upwards and is thus opened. Now causes an explosion in the separator to a pressure increase, which is greater than the Durchströmdruck, the

Swung check valve downwards, and then rests on the stop of the pipe socket and closes it to the separator. Since the seal of the non-return valve to the stop of the pipe socket in the course of operation through

Sticking or material removal may deteriorate, a wear and a position sensor are mounted in the tubular body, the proper operation of the

Monitor explosion protection device. However, such a device can be used only between plants or plant parts, which have a pneumatic conveying system that holds open the check valve in the conveying direction in the conveying direction. From DE 30 077 98 C2 Although an explosion-proof shut-off device with a propellant-operated

Locking device known which operates independently of the operational flow direction. This contains one in one

Pipe system installable housing in which as a closing member a slide plate is guided, which is movable transversely to the pipe system. To determine an explosion situation, a flame detector is additionally provided at the appropriate place, by which a propellant charge provided in the housing is triggered, which moves the slide plate to the tube interior. Because of the high explosive speed are so only Explosions decoupled, which is a greater distance to the

Have slide plate, since the closing process a

relatively large closing period required. The invention is therefore based on the object, a

Explosion protection device for the explosive decoupling of two parts of the plant to cause, which is independent of the operational flow direction and regardless of the distance to the explosion site.

This object is achieved by the invention defined in claim 1. Further developments and advantageous

Embodiments of the invention are specified in the subclaims.

The invention has the advantage that the inventive

Explosion protection device can be used by the obliquely inclined in the axial flow area closing flap even at high Staubbbeladungen in the product flow and is also suitable for non-pneumatically funded explosive Materialström. In particular, the inclined arrangement of the two mutually opposing closing flaps in the flow has the advantage that a triggering of the device and a

Decoupling of the system components independently of the

Direction of flow and regardless of the location of

explosion triggering event is because the

Explosion protection device only mechanically by an im

Pipe body occurring predetermined overpressure is triggered. A particular embodiment of the invention with a

Pressure relief opening covering lid, whose

Superior edge area is sealed with a heat-resistant porous sealing material, has the advantage that at the same time also a pressure relief to the atmosphere is achieved and a flame escape can be prevented. In a further particular embodiment of the invention in which the pivot bearing device is flattened several

Containing locking surfaces which abut against a bearing damper device is advantageous in that with the aid of a predetermined or adjustable spring force, the intended positions of the closing flaps are easily lockable and fixable, and at the same time a triggering pressure can be predetermined. An additional special embodiment of the invention in which the abutment side between the closing flaps and the abutment surfaces is formed obliquely, has the advantage that thereby the relatively large abutment surfaces, which rest on one another under pressure, can achieve a high sealing effect, the safe passage of explosive flames prevent. This advantageous effect is further improved by the fact that on the longitudinal sides of the closing flaps still a heat-resistant sealing material is applied in addition, that the lateral seal improved so that there is a flame passage is almost impossible. In this case, the application of the sealing material and the flat resting of the stop surfaces has the advantage that thereby in the guide channel for sealing no prominent

Stop edges are necessary at which settle material or material removal can take place, whereby a long-term flame protection would not be guaranteed.

The invention will be explained in more detail with reference to an embodiment which is illustrated in the drawing. Show it:

Fig. 1: a side view of a

Explosion protection device in normal

Conveying state as a sectional view; Fig. 2: a front view of a

Explosion protection device, and

Fig. 3: a side view of a

Explosion protection device in

explosion-actuated state as a sectional view.

In Fig. 1 of the drawing is a side view of a

Explosion protection device in the normal conveying operation shown as a sectional view, which contains a continuous tubular body 1, in which two axially oppositely arranged

Closing flaps 2, 3 are arranged articulated, whose

opposing shooting edges 5 abut each other. And so form a continuous conveyor channel 4 through the tubular body.

The tubular body 1 is preferably formed as a square tube body which can be installed in a pipe, not shown, which connects two systems or system parts together, are promoted in the explosive dusts or gases. Here, the square section of the tubular body 1 in

single of Fig. 2 of the drawing can be seen, in which the tubular body 1 is shown in more detail in front view. Thus, the tubular body 1 has a square on one side

Entrance opening 6 and on the axially opposite side of a square outlet opening 7, between which the conveying channel 4 extends. At the entrance opening 6 and the

Output opening 7, a mounting flange 8 is arranged in each case, with which the through-conveying pipe is tightly connected by means of screws with the tubular body 1. 1 and 2 of the drawing, the usual installation position of the tubular body 1 between a horizontal conveyor line, wherein the function is maintained in other mounting positions. In the installed position according to FIGS. 1 and 2 of the drawing, the conveying channel 4 bends between the two inlet and outlet openings 7 7 about 45 ° downwards, then about half of the

Conveyor in the tubular body 1 to extend horizontally linear, and then bend back by 45 ° upwards. For this purpose, the tubular body 1 consists of a housing part which has two continuous parallel vertical side walls 9 in the longitudinal direction, which are formed symmetrically to a transverse axis 10 and

preferably side plates represent. In the lower region, the two side walls 9 are connected to a horizontal transverse wall 29, which consists of a central base plate 11 and two stop plates 12, 13. In this case, the bottom plate 11 is arranged symmetrically to the transverse axis 10 horizontally and has a length which corresponds approximately to half the length of the tubular body 1. Between the edge of the mounting flanges 8 and the two ends of the bottom plate 11, a stop plate 12, 13 is then arranged, preferably at an angle of 45 ° to the horizontal flow direction and 45 ° to the vertical position of the mounting flange 6, 7 with the

Mounting flange 6, 7 and the bottom plate 11 is connected. In this case, the transverse wall 29 is a continuous lower

Side wall of the tubular body 1 is up. That is

Housing part of the tubular body 1 open and has a

rectangular, upwardly directed sheet edge 30. This opening of the tubular body up is covered by a rectangular cover 14, the above releasably on the housing part of the

Pipe body 1 is attached.

In the upper part of the tubular body 1, the two closing flaps 1, 2 are also arranged symmetrically to the transverse axis 10. Here, the first closing flap 2 in the area of the

Input opening 6 and the second closing flap 3 in the region of the outlet opening 7 between the two side walls 9 and pivotally mounted. This is one

Swivel bearing device 15 between the two side walls. 9 provided, consisting of a bearing pin 16, a

Valve bearing part 17 and a bearing damping device 18 consists. The bearing pin 16 is formed as a round bolt and arranged transversely between the side plates 9 and thereby

preferably attached to a side plate 9 .. The

Valve bearing part 17 consists of a bearing housing 19 with four longitudinal surfaces 24, whose length corresponds approximately to the width of the tubular body 1, which is approximately a square cross-section

has and in the center contains a longitudinal bore which serves to receive the bearing pin 16. There are three

Longitudinal edges of the bearing housing 19 are greatly flattened and each form a locking surface 20 to the bearing damping device 18. The bearing damping device 18 is above the

Valve bearing part 17 and arranged parallel to the bearing housing 19 between the two side plates 9. There is the

Bearing damping device 18 of a sheet metal housing 21, in which at least one damping spring 22 and an abutment rod 23 are arranged, wherein the abutment rod 23 always at one of the longitudinal surfaces 24 or the locking surfaces 20 of

Bearing housing 19 rests with a spring force.

To decouple the system parts, one closing flap 2, 3 is in each case provided on one of the longitudinal surfaces 24 of the bearing housing 19

attached. In this case, the closing flaps 2, 3 consist of an inwardly open rectangular box 25 whose width corresponds approximately to the width of the tubular body 1. With a rectangular transverse side of the rectangular box 25, each closing flap 2, 3 is connected to a longitudinal surface 24 of the bearing housing 19. The length of the closing flaps 2, 3 corresponds to at least the height of the conveying channel 4 or the passage height of the

Befestigungsflansches 8. In this case, the lower end of each closing flap 2, 3 includes a stop side 26, preferably at an obtuse angle of 135 ° to the closed box surface is arranged, wherein the angle is matched to the inclination angle of the stop plates 12, 13 as a respective stop. The stop side 26 is higher than the height of the

Long sides 27 of the rectangular box 25, so that the two opposite in the normal operating state closing flaps 2, 3 with their closing edges 5 for sealing close together or overlap.

For better sealing and decoupling of the conveying channel 4, a heat-resistant, not shown sealing material is applied to the two outer longitudinal sides 27 of the closing flaps 2, 3, which preferably consists of a porous open-pored plastic mesh whose grid webs of a

Metal layer are sheathed or wrapped. The metal layer is preferably made of a thin aluminum coating, through which a certain elasticity of the sealing material is ensured. This slightly elastic

Although gasket-permeable, gasket material prevents penetration of an explosion-induced flame in any case, since it is cooled by the metal and deflected many times by the grid bars.

On the top of the open tubular body 1, this is flame-closed by the lid 14. In this case, the lid 14 consists of a rectangular horizontal sheet metal part, the sheet metal edge 30 of the tubular body 1 on each side

projected at least 20 mm and is provided at its edges with a downwardly directed beaded edge 31. At the edge areas is between the inner wall surface of the

overlapping edge. 31 and the outer wall surface of the sheet edge 30 of the tubular body 1 for releasing pressure, a heat-resistant, air-permeable sealing material 28 is attached. This sealing material 28 has a thickness of preferably 20 to 50 mm and is made of a heat-resistant porous

Plastic grid. The grid bars of the Plastic lattice surrounded by a thin metal layer or sheathed, which preferably consists of a thin layer of aluminum. This porous sealing material 28 is a total of air or gas permeable and thereby causes explosive operation at the same time a pressure release to the outside to the atmosphere and prevented by its cooling and flame deflecting effect penetration of explosive flames. In Fig. 3 of the drawing an explosion protection device is shown, which was triggered by an explosion. In this case, this explosion protection device corresponds to that of FIG. 1 and 2 of the drawing and also contains the same

Reference numerals. The explosion protection device according to FIG. 1 represents this in the normal flow-through operating state, wherein the previous delivery channel 4 in the pipe system by the parallel position of the closing flaps 2, 3 with the

Stop plates 12, 13 inclined by a predetermined angle of preferably 45 ° inclined. The two lower sides of the closing flaps 2, 3 form a continuous upper side wall of the tubular body 1, wherein the two

Closing flaps 2, 3 preferably form an obtuse angle of 90 ° to 135 ° to each other. To the explosive

Protective function basically does not matter to the direction of flow. To describe the function of the

Explosion protection device is therefore assumed that the explosion-triggering event in the pipe system before

Entrance opening 6 is done. By such a

explosion-induced event arises in the tubular body 1 after the inlet opening 6 an instantaneous pressure increase of at least 0.1 to 3 bar, which is sufficient to apply the inclined inclined in the linear conveyor channel 4 first closing flap 2 with a necessary force upwards. Although this first closing flap 2 is by its bearing housing 19 and its locking bearing damping device 18 in position fixed, but pivotally mounted up or down against a spring force of the damping spring 23. It is the

Bearing damping device 18 adjusted by its damping spring 23 so that the first closing flap 2 in the normal

Delivery mode is fixed in their position. At a

predetermined overpressure of z. B. 0.1 to 3 bar is the

Spring force of the bearing damping device 18 exceeded and the abutment rod 23 is moved upward in the direction of the cover 14, so that the first closing flap 2 is pivoted upward and is fixed there by the bearing damping device 18 on the subsequent longitudinal surface 24 of the bearing housing 19, as shown in FIG. 3 of the drawing is shown. At the same time, the inner surface of the second

Closing flap 3 with an overpressure relative to the

Output port 7 charged. As soon as this is greater than the specified or set spring force of

Bearing damping device 18 of the second closing flap 3 is this from its fixed position down in her

Closed position pivots until they plan with their stop side 26 on the second stop plate 13 as a stop

rests. Due to the relatively large inclined abutment surfaces 26 is formed taking into account the seal of

Long sides 27 of the second closing flap 3 in this

Closed position a good flap seal, through which the outlet opening 7 sealed and thus from the

Entrance opening 6 is decoupled. By such

Sealing can be reliably prevented that an explosion-induced flame enters the following after the output port 7 part of the system.

At the same time is achieved by the lid 14 mounted on the porous sealing material 28, that a pressure equalization takes place to the outside to the atmosphere. Because of the upward pivoted first closing flap 2, the delivery channel 4 is no longer completely sealed in the pipe body 1 upwards. As a result, the internal overpressure can be dissipated via the projecting porous sealing material 28 over the projecting edge regions of the cover 14 to the outside to the atmosphere.

At the same time but by the sealing material 28th

prevents the explosion-related flames from escaping to the outside.

Such an explosion protection device works in the same way in the reverse direction, if the

explosion-related event is carried out before the exit opening 7, except that then the second closing flap 3 is pivoted upwards and the first closing flap 2 the

Inlet opening.6 closes. By such an explosive event, none of the components of the

Explosion protection device destroyed, so that it can be easily reset by removing the cover 14 in its operative state.

In a particular embodiment of

Explosion protection device could be a provision of

Closing flaps 2, 3 also self-employed by means of a

controllable servomotor to the storage devices 15 done.

Claims

Explosion protection device for explosive decoupling of two system components. Claims

1. Explosion protection device for explosive

Decoupling of two parts of the plant, which are interconnected by means of a pipeline in which explosive dusts or gases are conveyed, wherein within the pipeline a tubular body (1) is arranged, in which at least one closing flap (2, 3) is pivotally mounted, at a occurring

Explosion pressure changes to a closed position and thereby abuts a sealing stop (12, 13) in the tubular body (1), characterized in that the tubular body. (1) an inlet opening (6) and an axially spaced outlet opening (7) with two axially disposed therebetween closing flaps (2, 3), wherein the two closing flaps (2, 3) are fixed in the conveying state that they at their opposite Closing edges (5) abut each other so that they form a continuous side wall of the tubular body (1) and at a predetermined angle to each other slightly inclined inclined into the axial flow area of the tubular body (1) and in an explosion-induced pressure increase, the closest to the explosion closing flap (2, 3) pivoted outwards and the other

Closing flap (2, 3) towards the inner tube for

Closed position to a stop (12, 13) is pivoted.

2. Explosion protection device according to claim 1, characterized

characterized in that the tubular body (1) has a Entrance opening (6) with a mounting flange (8) and an outlet opening (7) with another

Mounting flange (8), with two parallel side walls (9) and a transverse wall (29) of a

Bottom plate (11) and two of the mounting flanges (8) outwardly inclined to the bottom plate (11)

Stop plates (12, 13), which leads to a

quadrangular continuous conveying channel (4) are connected.

Explosion protection device according to claim 1 or 2, characterized in that the conveying channel (4)

opposite to the transverse wall (29) two rotatable

stored and against each other and the

Bottom plate (11) inclined closing flaps (2, 3), through which the conveying channel (4) forms an approximately equal passage cross-section.

Explosion protection device according to one of claims 1 to 3, characterized in that the tubular body (1) on the opposite side of the bottom plate (11) has an opening which is covered by a rectangular cover (14) with a protruding edge region, wherein for pressure relief at least between the projecting edge region and the sheet edge (30) of the tubular body (1) a heat-resistant porous

Seal material (28) is arranged.

Explosion protection device according to one of claims 1 to 4, characterized in that the two

Closing flaps (3) symmetrical to a middle one

Transverse axis (10) within the tubular body (1) are arranged and consist of a bearing housing (19) and an inwardly open rectangular box (25), wherein on both longitudinal sides (27) of the rectangular box (25) opposite to the bearing housing (19) an obliquely arranged abutment side (26) is fixed, whose Anschrägwinkel on the inclination of the stop plates (12, 13) is tuned.

Explosion protection device according to claim 5, characterized in that a pivot bearing device (15) is provided which has a flap bearing part (17) with a longitudinal bearing housing (19) with approximately

contains square cross section whose

Connecting surfaces have a strong bevel and thereby form at least one locking surface (20).

Explosion protection device according to claim 6, characterized in that opposite to

Pivot bearing device (15) within the tubular body

(1) a bearing damping device (18) is arranged, which contains a sheet metal housing (21) with a damping spring (22) and an abutment rod (23) arranged therein, wherein the abutment rod (23) with a

predetermined spring force on one of the longitudinal surfaces (24) of the bearing housing (19) or Arretierungsflächen

(20) of the pivot bearing device (15) rests and thereby the closing flaps (2, 3) in one of

Fixed positions.

Explosion protection device according to one of Claims 1 to 7, characterized in that the longitudinal sides (27) of the rectangular box (25) of the closing flaps (2, 3) are coated or connected on the outside with a heat-resistant porous and slightly elastic damping material (28) arranged in this way in that it seals the closing flaps (2, 3) against the side walls (9) of the tubular body (1).