Title of Invention	AN APPARATUS FOR COMPENSATING EXPLOSION PRESSURE SURGES IN A CLOSED SYSTEM
Abstract	57) Abstract:- The present invention relates to a Apparatus for compensation of pressure surges in the course of possible dust-or gas-expiosions in closed systems, as for instance in silos, pipelines or the like, with a hinged lid or cover 3, which is configured at least in part as a hollow member pivotable around a pivot axis 4 at an outlet stub 2, characterized in that the hinged lid 3 comprises a planar external surface 6, wherein the internal surface 7 of the hinged lid pointing towards the inside of the outlet stub and lying opposite the planar external surface is configured to be arched or curved, whereby the walls 6,7 forming the hinged lid 3 are formed from thin metal sheets. PRICE: THIRTY RUPEES

Title of Invention

AN APPARATUS FOR COMPENSATING EXPLOSION PRESSURE SURGES IN A CLOSED SYSTEM

Abstract

57) Abstract:- The present invention relates to a Apparatus for compensation of pressure surges in the course of possible dust-or gas-expiosions in closed systems, as for instance in silos, pipelines or the like, with a hinged lid or cover 3, which is configured at least in part as a hollow member pivotable around a pivot axis 4 at an outlet stub 2, characterized in that the hinged lid 3 comprises a planar external surface 6, wherein the internal surface 7 of the hinged lid pointing towards the inside of the outlet stub and lying opposite the planar external surface is configured to be arched or curved, whereby the walls 6,7 forming the hinged lid 3 are formed from thin metal sheets. PRICE: THIRTY RUPEES

Full Text	The invention is directed towards an apparatus for compensation or equalization of pressure surges in the course of possible dust, dirt or gas explosions in closed systems, such as silos, pipelines or the like with a hinged cover or lid in lightweight construction pivotable around a pivot axis at an outlet stub. In order to divert pressure surges in containers through pipelines prior to their striking for instance downstream elements such as filters or the like, so-called explosion protection covers or lids are known, as for instance from the DE-A-24 55 325, the DE-A-30 42 026 or the DE-A 31 06 138. This lastly mentioned explosion protection lid in lightweight construction has given a good account of its self in actual practice, especially the system for damping of the lid when it opens as intended. A refinement of the damping system is shown in the DE-A-36 26 946. It was seen that in particular in pipelines due to the extremely high propagation velocity of pressure surges or waves, which can normally only propagate in one direction in pipelines, the lastly mentioned arrangement can still be improved, in particular as far as the design of the hinged lid itself is concerned. It is a task of the invention to design such a hinged cover or lid in an even more lightweight manner, so that it can be moved by the pressure surge in particular at an even higher velocity without being destroyed in the open position. This task is solved by the invention in an arrangement of the previously described type in that the hinged lid is configured at least partially as a hollow member. The design as partial hollow member entails a large number of advantages, Thus thinner sheet metal plates can overall be used for the construction of the lid, the cavity can be used for additional purposes as this is described further below and more of the like. It is provided in the design that the hinged lid or cover has a planar outer surface, wherein the surface of the hinged lid pointing towards the inside of the stub and located opposite the inner-and outer-surface is configured in an arched or domed manner. This design provides additional considerable advantages, as tests have shown, namely that the impacting pressure surge does not hit a planar surface, rather an arched or domed one, which on the one hand results in an improved initiation of the opening forces and on the other hand to a 'better diversion of the gases striking in an explosion-like manner. Further advantages of the invention result from the additional dependent claims. Thus the cavity of the hinged lid or cover can be foamed out with insulation foam material, the lid can additionally be equipped with a hinge bracket and/or with a heating device or more of the like. It can also be provided in the invention, to thermally separate the internal and external surface of the hinged cover, for instance to rivert or bond said surfaces against one another with interposition of a plastics insulation ring. This is expedient especially if formation of condensation water is to be avoided. It is also advantageous to equip the apparatus in the invention with damping elements for the opening hinged cover, as these were already described in the already mentioned systems in the DE-A-31 06 138 or the DE-A-36-26-946. According to the invention it is also provided that the recovery dish be equipped with a clamping spring lock for fixation of the swiveled out lid or cover in the open state, in order to prevent the lid from swiveling back in an uncontrolled manner. It is also achieved in case of an explosion, by the fixation or fastening in the open position that this disturbance can be optically determined from the outside due to the open and kept open lid. Accordingly the present invention provides an apparatus for compensating explosion-induced pressure surges in a closed system having pressure relief means, said apparatus comprising; an outlet stub attachable to the pressure relief means; and a hollow lid pivotally attached to said outlet stub, wherein the lid has an external planar wall and an internal arched wall attached to the external planar wall and having a concave surface thereof facing the external planar wall, the external planar wall and the internal arched wall defining together a hollow of the lid. * In the following the invention is described with particularity with the help of examples shown in the accompanying drawing, which show on: Figure 1 a side view of the arrangement partially in section. Figure 2 plan view along arrow II in figure 1, and Figure 3a to 3c a portion of the valve in the invention with a part of the receovery dish, wherein the lid is presented in three diflferent positions relatively to the recovery dish. The arrangement generally designated with the numeral 1 in the figures comprises an outlet stub 2, which can for instance—~ be flanged to a load relief portion of the pipe line. This outlet stub 2 is provided with a hinged lid generally designated by the numeral 3, which in case of an application of pressure, for instance by a blast or deflagration in the pipeline can be pivoted around a pivot axis 4 against a flexural recovery or capturing dish 5 of which only a portion is shown in figure 1. The hinged lid 3 is configured as a hollow member, meaning it has a planar external surface 6, for instance from aluminum sheet of 2 mm. thickness, and an internal surface 7 curved or arched in spherical segment like manner; herein the cavity designated by the numeral 8 between the internal surface 7 and the external surface 6 is filled with a plastics foam 9. The external surface 6 and internal surface 7 can also be connected with one another by point welding along the contact line 10 which is outlined in a dotted manner in figure 2; in this case however, an interposed insulation ring for thermal separation can be provided in such a way, that the external surface 6 and the internal surface 7 and said insulation ring are bonded or riveted with one another, which has not been shown in detail here. The metal sheet forming the internal surface 7 comprises a sealing web 11 embracing the outlet stub 2 externally, which sealing web 11 engages from the top into an annular seal 12 which externally surrounds the outlet stub 2. The lid 3 is provided in the area of the pivot axis 4 with a hinge bracket partially overlapping same externally, which hinge bracket 13 can also be configured at least regionally as a pocket, into which the hinqed lid 3 engages It is shown additionally in figures 1 and 2 that the recovery or capturing dish 5 is flexurally supported by means of helical springs 14; the possibility of equipping the hinged lid 3 with an additional heating device is not shown in detail. The hinged lid 3 is shown in different positions relatively to the flexural capture dish 5 in figures 3a. to 3c. Herein it can be seen from these figures, that the flexural capture or recovery dish 5 is equipped, in the upper region of the example shown, with a clamping spring lug 15, which lug cooperates with the margin or edge 11 of the lid 3 in such a way, that the edge 11 can pivot to below the lug 15, can however be fixed in the open position by means of a nose-like attachment 16. The different pivot positions are shown in figure 3a. to 3c., wherein in figure 3a. the lid 3 is still comparatively far from the capturing dish 5, with the pivoting motion in the opening direction being indicated by the arrow 17. In figure 3b. the lid 3 is shown just before contact with the clamping spring lug 15, while in figure 3c. the detent or snap-in position is shown, meaning the lid 3 is fixed in the open position in the capture or recovery dish 5 by the clamping spring lug 15 or the clamping extension 16. Naturally the embodiment example described in the invention can still be changed in many respects, without abandoning the thought in the invention. Thus the invention is not necessarily limited to the curvature or arching of the internal surface 7 as a spherical segment, in this respect a cross sectional elliptical shape or a shape curved in another way can be provided and more of the same. WE CLAIM: 1. An apparatus for compensating explosion-induced pressure surges in a closed system having pressure relief means, said apparatus comprising; an outlet stub attachable to the pressure relief means; and a hollow lid pivotally attached to said outlet stub, wherein the lid has an external planar wall and an internal arched wall attached to the external planar wall and having a concave surface thereof facing the external planar wall, the external planar wall and the internal arched wall defining together a hollow of the lid. 2. The apparatus according to claim 1 wherein the external planar wall and the internal arched wall are formed of thin light-metal sheets. 3. The apparatus according to claim 1, wherein the lid hollow is filled with a foam insulation. 4. The apparatus according to claim 1, wherein the metal sheet forming the internal arched wall, is formed as a spherical segment having an edge thereof attached to the external planar wall by point welding, and a circular sealing web is provided on an outer circumference of the edge. 5. The apparatus according to claim 1, wherein the lid is provided, in a region of a pivotal axis thereof with a hinge bracket. 6. The apparatus according to claim 5, wherein the hinge bracket is approximately pocket-shaped. 7. The apparatus according to claim 1, wherein the hollow lid is provided with a heating device. 8. The apparatus according to claim 1, wherein the external planar wall and the intemal arched wall are thermally separated. 9. The apparatus according to claim 1, wherein a recovery dish is connected to the outlet stub by means of elastic elements wherein faces of the lid and the recovery dish, which converge during the opening process, are planar. 10. The apparatus according to claim 9, wherein the recovery dish has a clamping spring lug for fixing the lid in a pivoted-out position. 11. An apparatus for compensating explosion-induced pressure surges in a closed system substantially herein described with reference to the accompanying drawings.

Full Text

The invention is directed towards an apparatus for compensation or equalization of pressure surges in the course of possible dust, dirt or gas explosions in closed systems, such as silos, pipelines or the like with a hinged cover or lid in lightweight construction pivotable around a pivot axis at an outlet stub.
In order to divert pressure surges in containers through pipelines prior to their striking for instance downstream elements such as filters or the like, so-called explosion protection covers or lids are known, as for instance from the DE-A-24 55 325, the DE-A-30 42 026 or the DE-A 31 06 138. This lastly mentioned explosion protection lid in lightweight construction has given a good account of its self in actual practice, especially the system for damping of the lid when it opens as intended. A refinement of the damping system is shown in the DE-A-36 26 946.
It was seen that in particular in pipelines due to the extremely high propagation velocity of pressure surges or waves, which can normally only propagate in one direction in pipelines, the lastly mentioned arrangement can still be improved, in particular as far as the design of the hinged lid itself is concerned.
It is a task of the invention to design such a hinged cover or lid in an even more lightweight manner, so that it can

be moved by the pressure surge in particular at an even higher velocity without being destroyed in the open position.
This task is solved by the invention in an arrangement of the previously described type in that the hinged lid is configured at least partially as a hollow member.
The design as partial hollow member entails a large number of advantages, Thus thinner sheet metal plates can overall be used for the construction of the lid, the cavity can be used for additional purposes as this is described further below and more of the like.
It is provided in the design that the hinged lid or cover has a planar outer surface, wherein the surface of the hinged lid pointing towards the inside of the stub and located opposite the inner-and outer-surface is configured in an arched or domed manner.
This design provides additional considerable advantages, as tests have shown, namely that the impacting pressure surge does not hit a planar surface, rather an arched or domed one, which on the one hand results in an improved initiation of the opening forces and on the other hand to a 'better diversion of the gases striking in an explosion-like manner.
Further advantages of the invention result from the additional dependent claims. Thus the cavity of the hinged lid or cover can be foamed out with insulation foam material, the lid can additionally be equipped with a hinge bracket and/or with a heating device or more of the like.

It can also be provided in the invention, to thermally separate the internal and external surface of the hinged cover, for instance to rivert or bond said surfaces against one another with interposition of a plastics insulation ring. This is expedient especially if formation of condensation water is to be avoided. It is also advantageous to equip the apparatus in the invention with damping elements for the opening hinged cover, as these were already described in the already mentioned systems in the DE-A-31 06 138 or the DE-A-36-26-946.
According to the invention it is also provided that the recovery dish be equipped with a clamping spring lock for fixation of the swiveled out lid or cover in the open state, in order to prevent the lid from swiveling back in an uncontrolled manner. It is also achieved in case of an explosion, by the fixation or fastening in the open position that this disturbance can be optically determined from the outside due to the open and kept open lid.
Accordingly the present invention provides an apparatus for
compensating explosion-induced pressure surges in a closed system having
pressure relief means, said apparatus comprising; an outlet stub attachable to
the pressure relief means; and a hollow lid pivotally attached to said outlet
stub, wherein the lid has an external planar wall and an internal arched wall
attached to the external planar wall and having a concave surface thereof
facing the external planar wall, the external planar wall and the internal
arched wall defining together a hollow of the lid.

*
In the following the invention is described with particularity with the help of examples shown in the accompanying drawing, which show on:
Figure 1 a side view of the arrangement partially in section.
Figure 2 plan view along arrow II in figure 1, and
Figure 3a to 3c a portion of the valve in the invention with a part of the receovery dish, wherein the lid is presented in three diflferent positions relatively to the recovery dish.
The arrangement generally designated with the numeral 1 in the figures comprises an outlet stub 2, which can for instance—~

be flanged to a load relief portion of the pipe line. This outlet stub 2 is provided with a hinged lid generally designated by the numeral 3, which in case of an application of pressure, for instance by a blast or deflagration in the pipeline can be pivoted around a pivot axis 4 against a flexural recovery or capturing dish 5 of which only a portion is shown in figure 1.
The hinged lid 3 is configured as a hollow member, meaning it has a planar external surface 6, for instance from aluminum sheet of 2 mm. thickness, and an internal surface 7 curved or arched in spherical segment like manner; herein the cavity designated by the numeral 8 between the internal surface 7 and the external surface 6 is filled with a plastics foam 9.
The external surface 6 and internal surface 7 can also be connected with one another by point welding along the contact line 10 which is outlined in a dotted manner in figure 2; in this case however, an interposed insulation ring for thermal separation can be provided in such a way, that the external surface 6 and the internal surface 7 and said insulation ring are bonded or riveted with one another, which has not been shown in detail here. The metal sheet forming the internal surface 7 comprises a sealing web 11 embracing the outlet stub 2 externally, which sealing web 11 engages from the top into an annular seal 12 which externally surrounds the outlet stub 2.
The lid 3 is provided in the area of the pivot axis 4 with a hinge bracket partially overlapping same externally, which hinge bracket 13 can also be configured at least regionally as a pocket, into which the hinqed lid 3 engages

It is shown additionally in figures 1 and 2 that the recovery or capturing dish 5 is flexurally supported by means of helical springs 14; the possibility of equipping the hinged lid 3 with an additional heating device is not shown in detail.
The hinged lid 3 is shown in different positions relatively to the flexural capture dish 5 in figures 3a. to 3c. Herein it can be seen from these figures, that the flexural capture or recovery dish 5 is equipped, in the upper region of the example shown, with a clamping spring lug 15, which lug cooperates with the margin or edge 11 of the lid 3 in such a way, that the edge 11 can pivot to below the lug 15, can however be fixed in the open position by means of a nose-like attachment 16.
The different pivot positions are shown in figure 3a. to 3c., wherein in figure 3a. the lid 3 is still comparatively far from the capturing dish 5, with the pivoting motion in the opening direction being indicated by the arrow 17. In figure 3b. the lid 3 is shown just before contact with the clamping spring lug 15, while in figure 3c. the detent or snap-in position is shown, meaning the lid 3 is fixed in the open position in the capture or recovery dish 5 by the clamping spring lug 15 or the clamping extension 16.
Naturally the embodiment example described in the invention can still be changed in many respects, without abandoning the thought in the invention. Thus the invention is not necessarily limited to the curvature or arching of the internal surface 7 as a spherical segment, in this respect a

cross sectional elliptical shape or a shape curved in another way can be provided and more of the same.

WE CLAIM:
1. An apparatus for compensating explosion-induced pressure surges in a closed system having pressure relief means, said apparatus comprising; an outlet stub attachable to the pressure relief means; and a hollow lid pivotally attached to said outlet stub, wherein the lid has an external planar wall and an internal arched wall attached to the external planar wall and having a concave surface thereof facing the external planar wall, the external planar wall and the internal arched wall defining together a hollow of the lid.
2. The apparatus according to claim 1 wherein the external planar wall and the internal arched wall are formed of thin light-metal sheets.
3. The apparatus according to claim 1, wherein the lid hollow is filled with a foam insulation.
4. The apparatus according to claim 1, wherein the metal sheet forming the internal arched wall, is formed as a spherical segment having an edge thereof attached to the external planar wall by point welding, and a circular sealing web is provided on an outer circumference of the edge.
5. The apparatus according to claim 1, wherein the lid is provided, in a region of a pivotal axis thereof with a hinge bracket.

6. The apparatus according to claim 5, wherein the hinge bracket
is approximately pocket-shaped.
7. The apparatus according to claim 1, wherein the hollow lid is
provided with a heating device.
8. The apparatus according to claim 1, wherein the external planar
wall and the intemal arched wall are thermally separated.
9. The apparatus according to claim 1, wherein a recovery dish is
connected to the outlet stub by means of elastic elements wherein faces of
the lid and the recovery dish, which converge during the opening process,
are planar.
10. The apparatus according to claim 9, wherein the recovery dish
has a clamping spring lug for fixing the lid in a pivoted-out position.
11. An apparatus for compensating explosion-induced pressure
surges in a closed system substantially herein described with reference to the
accompanying drawings.

Documents:

851-mas-95 abstract.jpg

851-mas-95 abstract.pdf

851-mas-95 claims.pdf

851-mas-95 correspondence-others.pdf

851-mas-95 correspondence-po.pdf

851-mas-95 description (complete).pdf

851-mas-95 drawings.pdf

851-mas-95 form-1.pdf

851-mas-95 form-26.pdf

851-mas-95 form-4.pdf

851-mas-95 others document.pdf

851-mas-95 others.pdf

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Patent Number

189663

Indian Patent Application Number

851/MAS/1995

PG Journal Number

30/2009

Publication Date

24-Jul-2009

Grant Date

27-Feb-2004

Date of Filing

07-Jul-1995

Name of Patentee

SHRI. ALBERT THORWESTEN

Applicant Address

DUNNUNGHAUSEN 43 DE-59269 BECKUM

Inventors:

#	Inventor's Name	Inventor's Address
1	NE	NE

PCT International Classification Number

N/A

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA