FR2520084A1 - QUICK CLOSURE DEVICE FOR AIR PASSAGES, ESPECIALLY FOR SHUTTLE AIR DUCTS - Google Patents

Abstract

THE INVENTION RELATES TO A QUICK-CLOSING DEVICE FOR THE AIR PASSAGE. IN A CHASSIS 1, A FIXED BLOCKING PART 7 IS PROVIDED TO COOPERATE WITH A MOBILE BLOCKING PART 6; EACH SHUTTER PART 6, 7 INCLUDES CLOSING BARS 8, 9 ARRANGED IN PARALLEL AND DELIMITED BETWEEN THEM OF AIR PASSAGE OPENINGS 10, 11, BARS 8, 9 OF EACH SHUTTER PART 6, 7 BEING CONNECTED BETWEEN THEM AT THEIR ENDS BY BARS 12, 13; THE BARS OF THE TWO SHUTTER PARTS ARE OFFSET LATERALLY WITH THEM SO THAT, IN THE CLOSED POSITION OF THE MOBILE SHUTTER PART 6, THEY COVER THE PASSAGE OPENINGS 10, 11 OF THE OTHER SHUTTER PART 6, 7; PORTIONS 12A, 13A OF THE LINK BARS 12, 13 WHICH ARE LOCATED BETWEEN THE CLOSING COMPONENTS 8, 9 PROVIDE A SUPPORT SURFACE 14, 15 FOR THE CLOSING COMPONENTS 8, 9 OF THE ASSOCIATED BLOCKING PART 6, 7 SO AS TO ENSURE CORRECT WATERPROOFING IN THESE EXTREME AREAS OF THE CLOSING COMPONENTS. APPLICATION TO SHELTER STRUCTURES.

Description

The present invention relates to a quick-closing device for

  air passages, in particular for shelter air ducts, comprising at least

  two cooperating shutter parts, which are de-

  positioned relative to each other in a direction of approach to a closed position and in a direction of removal into an open position, each closure portion having closure members separate from each other. other by passage openings and interconnected, the closure members of one of the closure portions being offset relative to the closure members of the other sealing portion so that, in the closed position of the two shutter parts,

  closing members of one of the closure parts

  covering the through holes of the other closure part, the dimension of each closure member being greater, perpendicular to the direction of movement of the closure parts, than

  the free width of the passage opening in re-

couvrement.

  By the expression "closing device

  pide ", which is also called" protective valve

  the explosions "means a valve closing and opening automatically, which is open in its service position, that is to say which allows a passage

  of air and which, when a wave of pressure

  of a certain intensity, moves automatically

  in the closed position. Such valves are provided in particular in air ducts which

  result in volumes with a risk of explo-

  such as shelters, which serve to prevent the penetration of a pressure wave into the volume to be protected, or the expansion of a pressure wave established in a volume.

  such quick closing valves that they pre-

  on the one hand, during the operation of the ventilation, a resistance to the air as low as possible and that, on the other hand, when pressure waves occur, they close

  in a short time, that is, in a few short

  second, and thus absorb without

Damage pressure jolts.

  We now know

  protection against explosions of this kind in

  which is provided a fixed support portion which is constituted by parallel bars between them which are separated from each other by orifices of

  air passage (U.S. Patents 3,015,342 and 3,296,952).

  For the closing of these air passages, there are provided closure bars which are individually slidably mounted, which are held in an open position by springs having a soft elasticity characteristic and which , during a solicitation by a wave of

  pressure, are moved to their closed position

  ture with counterbalancing of the force of the springs.

  To prevent a closing bar from

  jam during its closing movement, which

  would fish for a proper closure, it is necessary

  to provide precise guides for each individual bar

  These known valves are therefore of

very expensive construction.

  In patent CH 427 514 or in the patent

  No. 3,301,168, there is described a quick-closing device of the type defined above, in which the closure members, separated from each other by air passage openings, as well as from the fixed closing part of the shutter part guided by translation are interconnected at their ends For this purpose, the closing members of the movable shutter portion are offset relative to the closure members of the part of sealing

  fixed, so that in the closed position

  of the movable closing part, these closing members cover the passage openings of the fixed closing portion.

  compared to the solution described above, the advantage

  that, because of the connection of the iron

  the mobile closure part in the form of a one-piece assembly, only this one must

  to be guided, and not the different closing organs.

  On the other hand, this quick-closing device has the disadvantage of oppositing a high resistance to the flow of air in the open position. In an installation where the flow rates are high, this means that the quick-closing device must

  be provided with corresponding large dimensions.

  This, however, often has difficulties because there is often a limited available space for the installation of such a closure device

fast in the air duct.

  In addition, the closure members, arranged in the form of lamellae, of the movable closing portion

  are not at all able to withstand

  pressure, so that this known quick-closing valve can not be used when

  should expect high pressures.

  The present invention aims to create

  a quick-closing device of the type defined above

  above, which can withstand without damage the action of

  strong pressure jolts and which guarantees an obtura-

  perfectly sealed in the closed position

shutter parts.

  This problem is solved according to the invention in that the closure members of each closure portion are arranged so that, in the closed position of the closure portions, they enter the passage openings of the other part. shutter and are applied laterally against adjacent closure members of the other

shutter part.

  With the arrangement according to the invention, the closing members of the two shutter parts,

  we obtain that the closure devices of one of the

  shutter parts can be applied against adjacent closing members of the other sealing part, so that a correct seal is established by the closing pressure, caused by the pressure shock, against the zones the closing members can rest against the other closing devices in such a way that they can

  prevent residual deformation of the organs of.

  closing. Preferably, the closing members are arranged in the form of bars and are curved on

  their side turned to the other part of shutter.

  When the closure members of each closure part are connected to each other at their ends by means of a connecting member, whose

  parts between the closing members

  on the side facing the other closure part, a seat for a closure member of the other sealing part against which is sealingly abutted, in the closed position of the closure member, or a part, clinging to it, the connecting member is obtained with relatively simple means a good sealing effect also on the ends of the closure members,

  in particular also when the parts of

  t Uon come into contact with a slight relative shift

  in the longitudinal direction of the farm machinery

  ture. Other advantages and features of the invention will be highlighted, in the following

  description, given as a non-limita-

  tif, with reference to the accompanying drawings in which Figure 1 is an elevational view

  of an explosion protection valve

bearing two shutter parts;

  FIG. 2 is a section made on the line

Figure II-I 1 of Figure 1;

  FIG. 3 is a section on an enlarged scale

  die with respect to Figure 1, made along the line III-II of Figure 1; Figure 4 is a perspective view of a portion of the end zone of the two shutter portions in the closed position; FIG. 5 shows, in correspondence with FIG. 3, another embodiment of an explosion protection valve comprising two

  fixed parts of shutter and a movable part of shutter

  ration; Figures 6 and 7 show in section a part of the closure members of two shutter parts in the open position and in the closed position; and FIG. 8 is a sectional view of a part of

  two shutter parts of a third embodiment of

  an explosion protection valve.

  The explosion protection valve shown in FIGS. 1 to 3 comprises a frame frame 1 of rectangular shape which is provided with

  on one side of a border 2 projecting towards the interior

  On the opposite front side of the frame 1, there are also provided edges 3 which are fixed by means of screws 4 on the frame 1 and which rest against a protruding rim 5 of the frame. volume defined by the borders 2 and 3, there are provided two shutter portions 6 and 7, the shutter portion 7 being fixed, while the other shutter portion 6 is movable in the direction of the arrow D Each these closure parts 6, 7 comprise closure members 8, 9 in the form of bars, oriented parallel to each other and which are arranged at spacing distances spread A (Figure 3) The closing members 8, 9, each closure portion 6, 7 are separated from each other by air passage openings 10, 11 The closure members 8 of the movable sealing portion 6 have a circular cross section, which means that their outer surface 8a is formed by the

  peripheral surface of a circular cylinder

  closing nines 9 of the fixed sealing part 7

  have, on the other hand, a form of elongated cross section.

  On their side turned towards the mobile shutter

  6, these closure members 9 comprise a surface

  9 which is also constituted by a

  of a peripheral surface of a circular cylinder.

  The closing members 9 decrease in section in a direction opposite to the movable closing part 6, so that the passage openings 11 between the closure members 9 widen in the manner of a diffuser With this arrangement of the openings of passage

  11, an improvement in flow conditions is obtained.

  which results, for a given area of

  flow of the protective valve against

  explosions and in the event of a decrease in pressure de-

  completed, by increasing the flow rate With the

  9, the resistance of the sealing part 7 is further increased.

  compared to an embodiment and the or-

  ganes of closure would have a cylindrical shape

  -circular corresponding to the organs 8.

  As well, the closing members 8 of the movable closing portion 6 that the closing members 9 of the fixed sealing part 7 are connected to each other at their ends respectively with

  a connecting bar 12, 13, as shown in particular by

  FIGS. 3 and 4 With the aid of these connecting bars 12 and 13, the closing members 8 and 9 are held in their relative positions where the closing members 8 are offset relative to the closing members 9 so that the closing members 8, 9 of one of the closing portions 6, 7 are placed facing the passage openings 10, 11 of the other closing part 6, 7 so as to be able to close these passage openings 10 As shown in particular in FIG. 6, the closing members 8 are offset relative to the closing members 9 by a distance B which is approximately equal to half the spacing distance A of the axes of the fastening members. adjacent closure 8 or 9 of a sealing portion 6 or 7 The portions 12a, 13a of connecting bars 12, 13 which are located between the closing members 8, 9 are set back on their side facing the other part of filling 6, 7 and

  they comprise a support surface 14, 15 for a

  8, 9 These bearing surfaces 14, 15 have a shape corresponding to that of the outer surfaces 8a, 9a of closing members 8, 9 with which they cooperate sealingly in

  the closed position of the closing parts 6, 7.

  As shown in Figure 2, the ob-

  mobile ration 6 is maintained by elastic elements

  16, shown only schematically, in-its open position o it rests against the edge 2 and o it is spaced from the fixed sealing portion 7 For guiding the closing portion 6, it is provided at the top and bottom in the frame 1 of the guide bars 17 and 18 The lateral guidance of the sealing portion 6 can be ensured,

  either by the inner wall of the frame 3, or

by guide bars.

  Referring to Figures 6 and 7, o the closing members 9 of the fixed sealing portion 7 have also been shown, to simplify the

  drawing, in the form of circular cylindrical bars

  we will now describe a particular arrangement

  favorable cultivation of closure members 8 and 9.

  When in particular in the open position the two shutter portions 6 and 7 are maintained at a spacing such that the internal passage dimension 21 between respectively a closure member

  8 of the closing part 6 and the closing devices

  9 'and 9', adjacent to this organ, on the other side

  7, is approximately equal to half of the inner dimension of the through openings and 11 between the closure members 8 and 9, no adverse sectional changes occur.

  in the flow path of the air In addition, the cour-

  Closure 22 (FIG. 7) of the movable sealing part 6 is weak in correspondence Si for example

  the width 19 of the closure members 8 and 9, that is,

  That is to say, their diameter is 20 mm, and if the internal dimension of the passage openings 10 and 11 is equal to half of this value, that is to say to 10 mm, we obtain, for an internal dimension of the passage section 21 of 5 mm, a closing stroke 22 of the movable closing part 6 of about 6 mm. One thus obtains, for an internal dimension of the passage section 21 of 5 mm, a travel of Closure 22 of the movable closing part 6 by about 6 mm. Such an arrangement therefore makes it possible to obtain extremely short closing times. Furthermore, a small closing stroke is equivalent to a short accelerating stroke of the part d. mobile shutter 6 and, therefore, at a lower speed limit of this part Because the energy that must be canceled when the movable shutter portion 6 comes into contact with the fixed shutter portion 7 is proportional to the square of the speed of the movable shutter portion 6, forces acting on the parts

  shutter 6 and 7 are reduced in correspondence.

  When a pressure wave acts on the ob-

  ration 6 placed in the open position, it is moved in opposition to the force of the holding springs 16 in the open condition, in the direction of the arrow D, to the fixed closing portion 7. entry into

  contact of the closing part 6 with the obturation part

  7, the closing members 8 of the closing portion 6 are laterally applied against the closing members 9 of the closing portion 7, as shown in particular in FIG. 7. In these lateral bearing positions,

  it is produced by the effect of the pressure wave an application

  In addition, there is a lateral support of the bars 8 'of the movable closing part 6 against the bars 9 of the fixed sealing portion 7. As a result, the closure elements 8 and 9 are sealed against each other. this support of the bars 8, their deformation is kept as low as possible As has already been stated and as shown in particular in Fig 4, it occurs at the ends of the closure members 8 and 9, because of the particular arrangement connecting rods 12 and 13, also a good seal on the front side of the closing parts 6 and 7 As shown in FIG. 4, the outer surfaces 8 has closure members 8 in particular sealingly against the bearing surfaces 15 of the connecting bars 13, while, for their part, the outer surfaces 9 has closure members 9, come to apply

  sealed against the bearing surfaces 14 of the connecting bars 12.

  When, in the explosion protection valve of FIGS. 1 to 3, the closing part 7 is also mounted so as to be able to move in the frame 1, this explosion protection valve can also be closed.

  in the case where an aspiration succeeds the pressure wave.

  When a pressure wave propagating in the direction of the arrow D (FIG. 3) is exerted on the closing portion 6, the latter: is moved in the manner described above to the other shutter portion 7, which then relies on

  application surfaces 24 curbs 3 In the asphalt

  subsequent to the pressure wave and in which there is an air flow oriented in the direction of the arrow F (Fig 3), the closing portion 6 is moved back again until she comes to lean

  against the application surfaces 23 provided on the borders 2.

  The other shutter part 7, which is also displaced in the direction of the arrow S, now comes to bear against the sealing part 6, so that it occurs,

  in the manner already described, also a closing of

  In FIG. 3, there is shown in FIG. 3, at 6 'and 7', broken line lines

  closing both shutter parts.

  FIG. 5 is a purely diagrammatic representation of another embodiment of an explosion protection valve, which also closes as well in the case of a pressure wave as in the case of a

  suction effect occurring after this pressure wave.

  This valve comprises, as in the embodiment of Figs 1 to 3, a fixed sealing portion 7 and a movable sealing portion 6 These sealing portions correspond, as regards their structure, essentially to the parts of shutter 6 and 7 of the embodiment of Figs 1 to 3; Bar-shaped closing members 8 and 9 of these closing parts 6 and 7 are connected to each other at their ends also by means of connecting bars 12 and 13, which are arranged on their side facing respectively the l 6, 7 in the same manner as indicated in FIG. 4. Above the movable sealing portion 6 there is provided a second fixed sealing portion 25 which is in principle arranged in the same way as the fixed sealing portion 7 Unlike the latter, the second sealing portion 25 has, however, closure members 26 which have a circular cylindrical shape The existing air passage openings between these closing members 26 are designated by 27 The closing members 26 are interconnected at their ends by means of a connecting bar 28 The parts 28 has connecting bars which are located between the closing members 26 include, s on their side turned towards the closing part 6, a bearing surface 29 which corresponds to the shape of the outer surface of the closing members 8 and against which these closing members 8 can be sealingly applied. 6 is maintained, by means of springs 30 shown only schematically, in a median position between the two fixed sealing portions 7 and 25, so that, in this service position, the air can 'flow through the openings

passage 27, 10 and 11.

  In the case of a pressure wave coming in the direction of the arrow D, the movable sealing part 6 is moved towards the fixed sealing part 7, so that it is effected in the manner already described in FIG. closing the passage openings 10 and 11 During the next suction phase, the movable suction part 6 is moved in an opposite direction, that is to say in the direction of the arrow S, of the part of shutter 7 to the fixed sealing portion 25 When the sealing portion 6 comes into contact with the sealing portion, the passage openings 10 and 27 are now closed

also in the manner described.

  The embodiment of FIG. 5 comprises, by comparison

  because of the double-acting valve already described with reference to FIG. 3 and having altogether only two shutter parts, the disadvantage of greater loss

charge.

  In the case of the variant represented only

  In FIG. 8, the closing portions 31 and 32 differ from the closing parts 6 and 7 of the embodiment of FIGS. 1 to 3 by another cross-sectional shape of the closing members 33 and 34, which define between them there are passage openings designated 35 and 36. As shown in FIG. 8, the closing members 33 and 34, also arranged in the form of bars, have a cross-section of rectangular shape, in particular of square shape, and they comprise on their edges turned towards the closing members of the other closing part 31, 32, inclined bearing surfaces 38, 39 In the closed position of the two closing parts 31 and 32, the closing members 33 come apply by their bearing surfaces 38 against the bearing surfaces 39 of adjacent closure members 34 of the part

shutter 32.

  Because of the angular profile of the closing members 33 and 34, in this embodiment flow conditions are obtained which are more unfavorable than in the example

embodiment of Figs 1 to 3.

  In this respect, it should also be noted that the closure members may have any appropriate form of section

  right, for example also an elliptical shape.

  For the valve of Figs 1 to 3, the closing parts 6 and 7 can be mounted and dismounted easily after removal of the demountable borders 3 Because these demountable edges 3 are applied against the edges 5 forming

  part of the chassis 1, large forces can be trans-

  put, through the borders 2 and 3 and the edges 5,

  between blanking parts 6 and 7 and ch seated 1.

  It is possible to perform in a simple way, when

  this is necessary, a replacement of the borders 3.

  When, as explained with reference to FIGS. 6 and 7, the closing stroke of the movable closing portion 6 is made small, a slight clearance is necessary between the movable closing part 6 and the frame 1 to prevent skewing, and therefore jamming of the movable sealing portion 6, especially when the wave

  pressure is exerted obliquely.

  By a corresponding dimensioning of the closing members 8 and 9 in the form of bars, it is possible to manufacture explosion protection valves of the

  type described so that they can work properly

  harmless under the effect of pressure waves of up to 100 bar and more,

everything at a low pressure drop.

  In the embodiments shown, the connecting bars 12 and 13 are arranged so that the closing members 8 and 9 are disengaged on their side facing the connecting bars 12 and 13 of the other closing part 6, 7 It is also possible, however, that

  link 12, 13 cling to the closure members 8, 9.

  In this case, the hooking portions of the connecting bars and the bearing surfaces 14 and 15 of the other associated connecting bars 12, 13 are arranged in such a way that the hooking portions of the connecting bars are applied in such a way that tight against the bearing surfaces 14, 15 of the bar of

link placed opposite.

Claims (12)

  1. Quick closing device for air massaes, especially for shelter air ducts, comprising at least two cooperating shutter parts, which are movable relative to each other in a direction of approximation in a closed position and in a direction of removal into an open position, each closure part having closing members separated from each other by passage openings and connected   1 o between them, the closing devices of one of the parts   the closure part of the other closure part so that, in the closed position of the two closure parts cover the passage orifices of the other closure part, the dimension of each closing member being larger, perpendicular to the direction of movement of the closure portions, than the free width of the overlapping passage opening, characterized in that the closing members (8,9) of each part of shutter (6, 7) are arranged   in the closing position of the parts of ob-   turing (6, 7), they enter the openings of passages (10, 11) of the other closing part (6, 7) and are laterally applied against the closing members (8, 9).   adjacent to the other obturating part (6, 7).   2. Device according to claim 1, characterized in that the closure members 8, 9 are arranged in the form of bars and are curved on their side facing the other shutter portion 6, 7. 162520084   3. Device according to claim 2, characterized in that the outer surfaces (8a, 9a) of the closing members (8, 9) are formed, at least on the side facing the other closing portion (6). , 7), by the peripheral surface of a cylinder, preferably a circular cylinder.   4. Device according to one of claims 1 to 3,   characterized in that the closing members (8, 9) are arranged substantially parallel to one another and are spaced apart substantially equal distances (1) and in that the closure members (8, 9) of one of the parts (6, 7) are offset relative to the closure members (8, 9) of the other closure portion (6, 7) by half the spacing distance Q) between the members closing (8, 9).   Device according to one of Claims 1 to 4,   characterized in that the closing members (8, 9) of each closing part (6, 7) are interconnected at their ends by means of a connecting member (12, 13), parts of which ( 12a, 13a) between the closing members (8, 9) have, on the side facing the other closure part (6, 7), a seat (14, 15) for a closing member ( 8, 9) of this other sealing part (6, 7) against which, in a closed position, said sealing member (8, 9) or part of the sealing member hooking on this one.   6. Device according to claim 5, characterized in that each seat is formed by a bearing surface (14, 15) whose profile corresponds to the shape of the bearing surface (8 a, 9 a) of the associated closing member (8, 9) or of the part   of the connecting member clinging to it.   7. Device according to one of claims 1 to 6,   characterized in that, in the open position of the closure portions (6, 7), the inner dimension of the passage (21) respectively between a closure member (8) of one of the closure portions (6) ) and the adjacent closure member (9 ', 9 ") of the other closure portion (7) is approximately half of the internal dimension of the passage openings (10, 11).   8. Device according to one of claims 1 to 7,   characterized in that one of the shutter portions (7) is stationary, while the other shutter portion (6) is movable and in the open position the movable shutter portion (6) is kept spaced from the fixed sealing portion (7) by a holding force in condition   opening, for example by a spring force.   9. Device according to one of claims 1 to 7,   characterized in that the two closing parts (6, 7) are movable and are kept spaced from each other in an open position by a holding force in   opening condition, for example a spring force.   10. Device according to one of claims 8 or 9,   characterized in that the movable obturating part (6) or the movable obturating parts (6, 7) are guided in a frame (1) which has stops (2, 3) for limiting the translational travel of each shutter part (6, 7). -20,084   11. Device according to one of claims 1 to 7,   characterized in that there are two fixed sealing portions (7, 25) spaced from one another, and a third movable sealing part (6) which is arranged between the two fixed parts and which is maintained in a median opening position by a holding force in condition   opening, for example a spring force.   12. Device according to one of claims 1 to 11,   characterized in that the passage openings (11) of at least one sealing portion (7) are arranged in a manner   to widen towards the other closing part (6).