EP0318657B1 - Container with integral overpressure protection - Google Patents
Container with integral overpressure protection Download PDFInfo
- Publication number
- EP0318657B1 EP0318657B1 EP88115536A EP88115536A EP0318657B1 EP 0318657 B1 EP0318657 B1 EP 0318657B1 EP 88115536 A EP88115536 A EP 88115536A EP 88115536 A EP88115536 A EP 88115536A EP 0318657 B1 EP0318657 B1 EP 0318657B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- container
- wall
- rupture groove
- groove
- end wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D51/00—Closures not otherwise provided for
- B65D51/16—Closures not otherwise provided for with means for venting air or gas
- B65D51/1633—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element
- B65D51/1638—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element by means of an element bursting upon a predetermined pressure in the container being exceeded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D7/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal
- B65D7/02—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by shape
- B65D7/04—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by shape of curved cross-section, e.g. cans of circular or elliptical cross-section
- B65D7/045—Casks, barrels, or drums in their entirety, e.g. beer barrels, i.e. presenting most of the following features like rolling beads, double walls, reinforcing and supporting beads for end walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D7/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal
- B65D7/42—Details of metal walls
Definitions
- the invention relates to a pressurized metal container with overpressure protection, in particular a beer keg with an essentially cylindrical side wall and bulging end walls, at least one end wall being provided with a connecting piece, and the container wall being provided in the region of an end wall with a tear groove partially enclosing a surface area , through which the wall thickness is reduced to a predetermined residual thickness.
- a container of the type described above is known from DE-OS 35 33 406, which has a bulge in the bottom, the surface of which is provided with a tear groove which only partially surrounds a surface area. This takes advantage of the fact that if the permissible maximum pressure is exceeded, the container wall tears open at a precisely specified point and the excess pressure can escape.
- the invention has for its object to provide a container of the type mentioned, which has an integrated overpressure protection in the container itself, which responds reliably and is easy to manufacture.
- the tear groove is arranged in the transition region of the curvature of the end wall adjoining the side wall.
- the arrangement in this area of the container has the advantage that even with a large residual wall thickness defined by the tear groove, a reliable and flawless cracking occurs when a predetermined maximum pressure is exceeded. This is due to the fact that, under the influence of the internal pressure, the bulged end wall is subjected to considerable transverse expansion in this edge region, which leads to a crack if a limit stress which can be predetermined by the depth of the tear groove is exceeded.
- the groove expediently has an approximately wedge-shaped cross section, so that when pressure is applied, the necessary crack due to the notch effect and the superimposition of tensile and bending stresses in the area of the tear groove.
- the ends of the tear groove have a smaller radius of curvature Edge area of the curved end wall runs out.
- This makes it possible to use a rotating cutting tool to produce a tear groove with a constant groove depth, the circular tear groove being interrupted by the fact that the tool can run freely in the edge region.
- the arrangement of the tear groove is also advantageous for the use of a punching tool with a closed cutting contour, since the cutting contour is stressed much more favorably.
- the ends of the tear groove end in a recess formed in the container wall, in which the wall thickness is practically unchanged.
- This arrangement also has the advantage of simple manufacture.
- an approximately punctiform depression is preferably formed at the edge of the curvature.
- the tear groove can now be machined with a circumferential tool that runs freely in the area of the molded-in depression, so that the tear groove has the same depth over its entire length and thus a perfect functional reliability is provided. Except for the area of the depression, cracking can occur when the excess pressure is applied Use the tear groove at every point so that local deviations in the material properties can have no influence.
- the depression is arranged on the side of the surface area enclosed by the tear groove facing away from the edge area of the curved end face.
- This arrangement has the advantage that most of the tear groove runs in the area which is subjected to the greatest transverse expansion when pressurized.
- the further advantage of this arrangement is that such a tear groove can also be attached to barrels already in operation, since only a very small depression has to be incorporated here, which can also be attached to a finished barrel, for example, with a ball impact.
- the standing or carrying ring which is usually arranged in the case of kegs and projects over the curved end face in the extension of the side wall, does not hinder the subsequent attachment.
- the tear groove is arranged on the end wall carrying the connecting piece.
- Such kegs are usually connected to the pressure system with the connection piece pointing upwards. If, when the specified maximum pressure is exceeded, the integrated overpressure safety device comes into operation, which, depending on the size of the remaining wall thickness specified by the tear groove, can be between pressures of 20 to 30 bar, then the usually gaseous pressure medium blows upwards. The recoil forces acting on the container are thus directed downwards, so that the container can tip over due to the lateral arrangement.
- Another advantage is that the pressure reduction takes place much faster due to the escape of the gaseous medium, the gas volume to be blown off being generally considerably less than the remaining liquid volume still in the barrel.
- the opening which is created when the tear is opened is directed essentially against the inner wall of the support ring, so that here a deflection of the escaping gas jet takes place, which is practically without any movement of the keg triggering force remains.
- the arrangement on the end wall forming the container bottom is possible and equally effective with regard to a relatively low "response pressure".
- the disadvantage is that with a tearing pressure of, for example, 20 bar and an opening cross section sufficient for the pressure to decrease as quickly as possible, the reaction forces which act on the container through the then jet-like liquid are so great that the container is raised almost like a floor .
- An arrangement in the top end face is therefore preferable, as kegs of this type can then be safely placed directly under the dispenser.
- the tear groove has an approximately trapezoidal cross section. This has the advantage that the necessary remaining thickness of the container wall can be kept somewhat larger in the area of the tear groove.
- the beer keg shown in Fig. 1 in a vertical section a so-called keg, consists of two sections 1 and 2, which are deep-drawn from metal and are firmly connected to each other after the incorporation of the rolling rings 3 in the central plane via the weld 4.
- the bulged end wall 5 of part 1 is provided with a connection fitting 6.
- a barrel sump 8 is formed in the bulged end wall 7 of part 2 forming the base part.
- a base ring 9 or 10 is welded to both the base part 7 and the end wall 5 forming the cover part.
- Fig. 2 shows in section the dome-shaped lid part 5 of the keg shown in Fig. 1.
- the cover part merges with a radius of curvature R1 into the essentially cylindrical side wall 22, which is considerably smaller than the radius of curvature R2 of the spherical cap part.
- This edge region 21 is surrounded on the outside by the welded-on stand ring 10.
- the circular tear groove 14 is worked in with a rotating cutting tool, the path of movement of the tool being laid such that it ends in the edge region 21 of the curvature of the end wall 5 which has the smaller radius of curvature R1, so that the top view 3 shows an open circular contour.
- a crack occurs in the apex region 23 of the tear groove 14 due to the transverse expansion in the end face 5.
- the surface area 16 enclosed by the tear groove 14 is opened outwards, as shown in broken lines in FIG. 2. Due to the material deformation, the crack occurs at about 20 to 24 bar.
- the tear groove 14 can be wedge-shaped in cross-section or else trapezoidal. This results in a more favorable tear behavior, especially with regard to the superimposition of tensile and bending stresses in the event of overpressure.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Containers With Two Or More Constituent Elements (AREA)
- Containers Opened By Tearing Frangible Portions (AREA)
- Safety Valves (AREA)
Description
Die Erfindung betrifft einen druckbeaufschlagten Behälter aus Metall mit Überdrucksicherung, insbesondere Bierfaß mit im wesentlichen zylindrischer Seitenwandung und nach außen gewölbten Stirnwänden wobei wenigstens eine Stirnwand mit einem Anschlußstutzen versehen ist, und wobei die Behälterwandung im Bereich einer Stirnwand mit einer einen Flächenbereich teilweise umschließenden Reißnut versehen ist, durch die die Wandstärke bis auf eine vorgegebenen Restdicke reduziert ist.The invention relates to a pressurized metal container with overpressure protection, in particular a beer keg with an essentially cylindrical side wall and bulging end walls, at least one end wall being provided with a connecting piece, and the container wall being provided in the region of an end wall with a tear groove partially enclosing a surface area , through which the wall thickness is reduced to a predetermined residual thickness.
Insbesondere in der Getränkeindustrie werden metallische Behälter, sogenannte Kegs eingesetzt, die durch Beaufschlagung mit einem Druckgas entleert werden. Hierbei muß sichergestellt sein, daß bei unbeabsichtigten Überschreitungen der Maximaldruckgrenze der Überdruck abgebaut wird. Ein Behälter der eingangs bezeichneten Art ist aus der DE-OS 35 33 406 bekannt, der im Boden eine Auswölbung aufweist, deren Fläche mit einer einen Flächenbereich nur teilweise umschließenden Reißnut versehen ist. Hierbei wird ausgenutzt, daß bei einer Überschreitung des zulässigen Maximaldruckes die Behälterwandung an einer genau vorgegebenen Stelle aufreißt und der Überdruck entweichen kann. Derartige Drucküberschreitungen sind im Getränkebereich sehr selten, da sie bei den gebräuchlichen Zapfsystemen nur bei einer Fehlbedienung auftreten können, so daß man in Kauf nehmen kann, daß bei einer derartigen Überschreitung des höchstzulässigen Drucks und dem Wirksamwerden der Überdrucksicherung der betreffenden Behälter unbrauchbar wird. Der von der Reißnut umschlossene Flächenbereich wird klappenartig nach außen gedrückt, da der herausklappende Flächenbereich in dem nicht von der Reißnut umgrenzten Restbereich seine unveränderte Wandstärke aufweist und somit dieser Teil als "Gelenk" wirkt. Die Reißnut kann, wie die DE-OS 35 33 406 zeigt, durch ein entsprechendes Prägewerkzeug eingebracht werden, dessen Schneide eine nicht vollständig geschlossene kreisartige Kontur aufweist. Derartige Formen, auch reine Kreisformen, können jedoch durch ein rotierendes Werkzeug spanabhebend nach Fertigstellung des Behälters nicht angebracht werden.Metallic containers, so-called kegs, are used in particular in the beverage industry and are emptied by the application of compressed gas. It must be ensured that the overpressure is reduced if the maximum pressure limit is exceeded unintentionally. A container of the type described above is known from DE-OS 35 33 406, which has a bulge in the bottom, the surface of which is provided with a tear groove which only partially surrounds a surface area. This takes advantage of the fact that if the permissible maximum pressure is exceeded, the container wall tears open at a precisely specified point and the excess pressure can escape. Such pressure overruns are very rare in the beverage sector, since they can only occur in the event of incorrect operation in the conventional dispensing systems, so that it can be accepted that if the maximum permissible pressure is exceeded and the overpressure protection of the container concerned becomes ineffective. The surface area enclosed by the tear groove is pressed outward in a flap-like manner, since the surface area that folds out has its unchanged wall thickness in the remaining area not delimited by the tear groove, and thus this part acts as a “joint”. The tear groove can, as the DE-OS 35 33 406 shows, by an appropriate embossing tool be introduced, the cutting edge of which has a not completely closed circular contour. However, such shapes, including pure circular shapes, cannot be machined by a rotating tool after completion of the container.
Der Erfindung liegt die Aufgabe zugrunde, einen Behälter der eingangs bezeichneten Art zu schaffen, der eine in den Behälter selbst integrierte Überdrucksicherung aufweist, die zuverlässig anspricht und einfach herzustellen ist.The invention has for its object to provide a container of the type mentioned, which has an integrated overpressure protection in the container itself, which responds reliably and is easy to manufacture.
Diese Aufgabe wird dadurch gelöst, daß die Reißnut in dem an die Seitenwandung anschliessenden Übergangsbereich der Wölbung der Stirnwand angeordnet ist. Die Anordnung in diesem Bereich des Behälters hat den Vorteil, daß selbst bei einer durch die Reißnut definierten großen Restwandstärke ein zuverlässiger und einwandfreier Anriß bei Überschreitung eines vorgegebenen Maximaldruckes erfolgt. Dies ist darauf zurückzuführen, daß unter dem Einfluß des Innendruckes die ausgewölbte Stirnwand in diesem Randbereich einer erheblichen Querdehnung unterworfen ist, die bei Überschreiten einer durch die Tiefe der Reißnut vorgebbaren Grenzbeanspruchung zu einem Anriß führt. Die Nut weist zweckmäßigerweise einen in etwa keilförmigen Querschnitt auf, so daß bei Überdruckbeaufschlagung der notwendige Anriß durch die Kerbwirkung und die Überlagerung von Zug- und Biegebeanspruchung im Bereich der Reißnut einsetzt. Dieser Vorteil wird insbesondere bei den üblicherweise aus zwei tiefgezogenen Hälften zusammengesetzten Kegs ausgenutzt, da der zwischen der im wesentlichen als Kugelkalotte gekrümmten Stirnfläche und der zylindrischen Seitenwandung liegende Übergangsbereich einen erheblich kleineren Krümmungsradius aufweist. Der unmittelbar an diesen Randbereich angrenzenden Teil der Stirnwand unterliegt bei einer Druckbeaufschlagung der größten Querdehnung.This object is achieved in that the tear groove is arranged in the transition region of the curvature of the end wall adjoining the side wall. The arrangement in this area of the container has the advantage that even with a large residual wall thickness defined by the tear groove, a reliable and flawless cracking occurs when a predetermined maximum pressure is exceeded. This is due to the fact that, under the influence of the internal pressure, the bulged end wall is subjected to considerable transverse expansion in this edge region, which leads to a crack if a limit stress which can be predetermined by the depth of the tear groove is exceeded. The groove expediently has an approximately wedge-shaped cross section, so that when pressure is applied, the necessary crack due to the notch effect and the superimposition of tensile and bending stresses in the area of the tear groove. This advantage is exploited in particular in the case of the kegs which are usually composed of two deep-drawn halves, since the one between the end face which is essentially curved as a spherical cap and the cylindrical side wall lying transition area has a significantly smaller radius of curvature. The part of the end wall immediately adjacent to this edge area is subject to the greatest transverse expansion when pressure is applied.
Um nun in einfacher Weise eine Unterbrechung der im übrigen nicht unterbrochenen Reißnut zu bewerkstelligen, um so das vorstehend angegebene "Gelenk" mit unveränderter Wandstärke zu erhalten, ist in vorteilhafter Ausgestaltung der Erfindung vorgesehen, daß die Reißnut mit ihren Enden in den einen kleineren Krümmungsradius aufweisenden Randbereich der gewölbten Stirnwand ausläuft. Hierdurch ist es möglich, ein rotierendes Schneidwerkzeug zur Erzeugung einer Reißnut mit gleichbleibender Nuttiefe einzusetzen, wobei die an sich kreisförmige Reißnut dadurch unterbrochen ist, daß das Werkzeug im Randbereich freilaufen kann. Auch für den Einsatz eines Stanzwerkzeuges mit geschlossener Schneidenkontur ist die Anordnung der Reißnut vorteilhaft, da eine wesentlich günstigere Beanspruchung der Schneidekontur gegeben ist.In order to easily interrupt the otherwise uninterrupted tear groove so as to obtain the above-mentioned "joint" with unchanged wall thickness, it is provided in an advantageous embodiment of the invention that the ends of the tear groove have a smaller radius of curvature Edge area of the curved end wall runs out. This makes it possible to use a rotating cutting tool to produce a tear groove with a constant groove depth, the circular tear groove being interrupted by the fact that the tool can run freely in the edge region. The arrangement of the tear groove is also advantageous for the use of a punching tool with a closed cutting contour, since the cutting contour is stressed much more favorably.
In einer anderen Ausgestaltung der Erfindung ist jedoch vorgesehen, daß die Reißnut mit jeweils ihren Enden in eine in der Behälterwandung eingeformte Vertiefung ausläuft, in der die Wandstärke praktisch unverändert ist. Diese Anordnung hat ebenfalls den Vorteil einer einfachen Herstellung. Beim Tiefziehen des die betreffende Stirnwand aufweisenden Behälterteils wird vorzugsweise am Rande der Wölbung eine in etwa punktförmige Vertiefung mit eingeformt. Nach der Fertigstellung des Behälters kann nunmehr die Reißnut spanabhebend mit einem umlaufenden Werkzeug eingearbeitet werden, das im Bereich der eingeformten Vertiefung freiläuft, so daß die Reißnut über ihre gesamte Länge die gleiche Tiefe aufweist und damit eine einwandfreie Funktionssicherheit gegeben ist. Bis auf den Bereich der Vertiefung kann bei Einwirken des Überdrucks die Rißbildung an jeder Stelle der Reißnut einsetzen, so daß lokale Abweichungen der Materialeigenschaft keinen Einfluß haben können. Besonders zweckmäßig ist es, wenn die Vertiefung auf der dem Randbereich der gewölbten Stirnfläche abgekehrten Seite des von der Reißnut umschlossenen Flächenbereichs angeordnet ist. Diese Anordnung hat den Vorteil, daß der größte Teil der Reißnut in dem Bereich verläuft, der bei einer Druckbeaufschlagung der größten Querdehnung unterworfen ist. Der weitere Vorteil dieser Anordnung besteht darin, daß eine derartige Reißnut auch an bereits im Betrieb befindlichen Fässern angebracht werden kann, da hier nur eine sehr geringe Vertiefung einzuarbeiten ist, die beispielsweise mit einem Kugeleinschlag auch an einem fertigen Faß angebracht werden kann. Der üblicherweise bei Kegs angeordnete, die gewölbten Stirnfläche in Verlängerung der Seitenwandung jeweils überragende Stand- bzw. Tragring behindert die nachträgliche Anbringung nicht. In besonders zweckmäßiger Ausgestaltung der Erfindung ist insbesondere für derartige Kegs vorgesehen, daß die Reißnut auf der den Anschlußstutzen tragende Stirnwand angeordnet ist. Derartige Kegs werden üblicherweise mit nach oben weisendem Anschlußstutzen an die Druckanlage angeschlossen. Tritt nun bei einer Überschreitung des vorgegebenen Maximaldruckes die integrierte Überdrucksicherung in Funktion, was je nach Größe der durch die Reißnut vorgegebenen Restwandstärke zwischen Drücken von 20 bis 30 bar liegen kann, so bläst das üblicherweise gasförmige Druckmedium nach oben ab. Die auf den Behälter wirksam werdenden Rückstoßkräfte sind also nach unten gerichtet, so daß der Behälter aufgrund der seitlichen Anordnung allenfalls kippen kann. Ein weiterer Vorteil besteht darin, daß der Druckabbau durch das Entweichen des gasförmigen Mediums sehr viel schneller erfolgt, wobei das abzublasende Gasvolumen in der Regel erheblich geringer ist als das noch im Faß befindliche restliche Flüssigkeitsvolumen. Bei Kegs mit Tragring, bei denen die Reißnut durch eine Vertiefung unterbrochen ist, wie vorstehend angegeben, ist die beim Aufreißen entstehende Öffnung im wesentlichen gegen die Innenwandung des Tragringes gerichtet, so daß hier eine Umlenkung des austretenden Gasstrahles erfolgt, die praktisch ohne eine eine Bewegung des Kegs auslösende Kraftwirkung bleibt.In another embodiment of the invention, however, it is provided that the ends of the tear groove end in a recess formed in the container wall, in which the wall thickness is practically unchanged. This arrangement also has the advantage of simple manufacture. When the container part having the relevant end wall is deep-drawn, an approximately punctiform depression is preferably formed at the edge of the curvature. After completion of the container, the tear groove can now be machined with a circumferential tool that runs freely in the area of the molded-in depression, so that the tear groove has the same depth over its entire length and thus a perfect functional reliability is provided. Except for the area of the depression, cracking can occur when the excess pressure is applied Use the tear groove at every point so that local deviations in the material properties can have no influence. It is particularly expedient if the depression is arranged on the side of the surface area enclosed by the tear groove facing away from the edge area of the curved end face. This arrangement has the advantage that most of the tear groove runs in the area which is subjected to the greatest transverse expansion when pressurized. The further advantage of this arrangement is that such a tear groove can also be attached to barrels already in operation, since only a very small depression has to be incorporated here, which can also be attached to a finished barrel, for example, with a ball impact. The standing or carrying ring, which is usually arranged in the case of kegs and projects over the curved end face in the extension of the side wall, does not hinder the subsequent attachment. In a particularly expedient embodiment of the invention, it is provided in particular for such kegs that the tear groove is arranged on the end wall carrying the connecting piece. Such kegs are usually connected to the pressure system with the connection piece pointing upwards. If, when the specified maximum pressure is exceeded, the integrated overpressure safety device comes into operation, which, depending on the size of the remaining wall thickness specified by the tear groove, can be between pressures of 20 to 30 bar, then the usually gaseous pressure medium blows upwards. The recoil forces acting on the container are thus directed downwards, so that the container can tip over due to the lateral arrangement. Another advantage is that the pressure reduction takes place much faster due to the escape of the gaseous medium, the gas volume to be blown off being generally considerably less than the remaining liquid volume still in the barrel. In the case of kegs with a support ring, in which the tear groove is interrupted by a recess, as stated above, the opening which is created when the tear is opened is directed essentially against the inner wall of the support ring, so that here a deflection of the escaping gas jet takes place, which is practically without any movement of the keg triggering force remains.
Die Anordnung an der den Behälterboden bildende Stirnwand, beispielsweise im Bereich des Faßsumpfes, insbesondere aber auch im Randbereich der gewölbten Bodenfläche, ist zwar möglich und hinsichtlich eines verhältnismäßig niedrigen "Ansprechdruckes" in gleicher Weise wirksam. Der Nachteil besteht jedoch darin, daß bei einem Reißdruck von beispielsweise 20 bar und einem für einen möglichst raschen Druckabbau ausreichenden Öffnungsquerschnitt dann die Reaktionskräfte, die durch die dann strahlförmig austretende Flüssigkeit auf den Behälter wirken, so groß sind, daß der Behälter nahezu geschoßartig angehoben wird. Eine Anordnung in der obenliegenden Stirnfläche ist daher der Vorzug zu geben, da dann derartige Kegs gefahrlos auch unmittelbar unter der Zapfanlage aufgestellt werden können.The arrangement on the end wall forming the container bottom, for example in the region of the barrel sump, but in particular also in the edge region of the curved bottom surface, is possible and equally effective with regard to a relatively low "response pressure". The disadvantage, however, is that with a tearing pressure of, for example, 20 bar and an opening cross section sufficient for the pressure to decrease as quickly as possible, the reaction forces which act on the container through the then jet-like liquid are so great that the container is raised almost like a floor . An arrangement in the top end face is therefore preferable, as kegs of this type can then be safely placed directly under the dispenser.
In Ausgestaltung der Erfindung ist vorgesehen, daß die Reißnut einen in etwa trapezförmigen Querschnitt aufweist. Dies hat den Vorteil, daß die notwendige Restdicke der Behälterwandung im Bereich der Reißnut etwas größer gehalten werden kann.In an embodiment of the invention it is provided that the tear groove has an approximately trapezoidal cross section. This has the advantage that the necessary remaining thickness of the container wall can be kept somewhat larger in the area of the tear groove.
Die Erfindung wird anhand schematischer Zeichnungen näher erläutert. Es zeigen:
- Fig. 1
- einen Getränkebehälter im Vertikalschnitt,
- Fig. 2 und 3
- Eine Ausführungsform der Überdrucksicherung an Getränkebehältern im Schnitt und in Aufsicht im Deckelbereich B.
- Fig. 1
- a beverage container in vertical section,
- 2 and 3
- An embodiment of the overpressure protection on beverage containers in section and under supervision in the lid area B.
Das in Fig. 1 in einem Vertikalschnitt dargestellte Bierfaß, ein sogenannter Keg, besteht aus zwei Teilstücken 1 und 2, die aus Metall tiefgezogen sind und nach dem Einarbeiten der Rollringe 3 in der Mittelebene über die Schweißnaht 4 fest miteinander verbunden sind. Die ausgewölbte Stirnwand 5 des Teiles 1 ist mit einer Anschlußarmatur 6 versehen. In die ausgewölbte, den Bodenteil bildende Stirnwand 7 des Teiles 2 ist ein Faßsumpf 8 eingeformt. Sowohl am Bodenteil 7 als auch an der den Deckelteil bildenden Stirnwand 5 ist jeweils ein Standring 9 bzw. 10 angeschweißt.The beer keg shown in Fig. 1 in a vertical section, a so-called keg, consists of two
Fig. 2 zeigt im Schnitt den kalottenförmig ausgewölbten Deckelteil 5 des in Fig. 1 dargestellten Kegs. Der Deckelteil geht in seinem Randbereich 21 mit einem Krümmungsradius R1 in die im wesentlichen zylindrische Seitenwandung 22 über, der erheblich geringer ist als der Krümmungsradius R2 des kalottenförmigen Deckelteils. Dieser Randbereich 21 ist auf der Außenseite von dem angeschweißten Standring 10 umfaßt.Fig. 2 shows in section the dome-
Vor dem Anschweißen des Standringes 10 wird mit einem rotierenden Schneidewerkzeug die kreisförmige Reißnut 14 eingearbeitet, wobei die Bewegungsbahn des Werkzeugs so gelegt ist, daß es in dem den kleineren Krümmungsradius R1 aufweisenden Randbereich 21 der Wölbung der Stirnwand 5 ausläuft, so daß die in der Draufsicht in Fig. 3 dargestellte offene Kreiskontur entsteht.Before the
Bei einer Druckbeaufschlagung, die den durch die Tiefe der Reißnut 14 vorgegebenen höchstzulässigen Druck überschreitet, erfolgt im Scheitelbereich 23 der Reißnut 14 aufgrund der Querdehnung in der Stirnfläche 5 ein Anriß. Durch die senkrecht zur Innenfläche wirkenden Kräfte wird hierbei der von der Reißnut 14 umschlossene Flächenbereich 16 nach außen aufgeklappt, wie dies in Fig. 2 gestrichelt dargestellt ist. Aufgrund der Materialverformung erfolgt der Anriß bei etwa 20 bis 24 bar. Die Reißnut 14 kann im Querschnitt keilförmig oder aber auch trapezförmig ausgebildet sein. Dies hat insbesondere im Hinblick auf die Überlagerung von Zug- und Biegespannungen im Überdruckfall ein günstigeres Reißverhalten zur Folge.When pressure is applied which exceeds the maximum permissible pressure specified by the depth of the
Claims (6)
- Container which can be pressurised, is made from metal and has an excess pressure safety system, particularly a beer barrel with an essentially cylindrical side wall and outwardly bulging end walls, in which at least one end wall is provided with a pipe connection and in which the wall of the container is provided with a rupture groove which partially surrounds an area of the surface and by which the wall thickness is reduced to a predetermined residual thickness, characterised in that the rupture groove (14) is arranged in the transitional region (21) of the bulge in the end wall (5) adjoining the side wall (22).
- Container as claimed in claim 1, characterised in that the ends of the the rupture groove (14) terminate in the edge region of the bulge in the end wall (5) having a smaller radius of curvature (R1).
- Container as claimed in claim 1, characterised in that the ends of the rupture groove (14) terminate in an indentation formed in the container wall in which the wall thickness is practically unaltered.
- Container as claimed in claim 3, characterised in that the indentation is arranged on the side of the area of the surface (16) surrounded by the rupture groove (14) facing away from the wall region (21) of the bulged end face (5).
- Container as claimed in one of claims 1 to 4, characterised in that the rupture groove (14) has an approximately trapeziform cross-section.
- Container as claimed in one of claims 1 to 5, characterised in that the rupture groove (14) is arranged on the end wall (5) bearing the pipe connection (6).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873737977 DE3737977A1 (en) | 1987-11-08 | 1987-11-08 | CONTAINER WITH INTEGRATED PRESSURE SAFETY |
DE3737977 | 1987-11-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0318657A1 EP0318657A1 (en) | 1989-06-07 |
EP0318657B1 true EP0318657B1 (en) | 1992-04-22 |
Family
ID=6340099
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88115536A Expired - Lifetime EP0318657B1 (en) | 1987-11-08 | 1988-09-22 | Container with integral overpressure protection |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0318657B1 (en) |
DE (2) | DE3737977A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9303113U1 (en) * | 1993-03-05 | 1994-04-14 | Schäfer Werke GmbH, 57290 Neunkirchen | Pressure-resistant metal container |
DE4437748C2 (en) * | 1994-09-20 | 1996-07-04 | Schuetz Werke Gmbh Co Kg | Process for the reconditioning of standard plastic sheet drums |
DE20115158U1 (en) * | 2001-09-14 | 2002-02-14 | Schaefer Werke Gmbh | Beverage dispensing equipment |
FR2875765B1 (en) * | 2004-09-30 | 2008-10-10 | Peugeot Citroen Automobiles Sa | DEVICE FOR PROTECTING A WATER TANK FOR WASHING THE GLASS ELEMENTS OF A MOTOR VEHICLE |
DE102010044338B4 (en) | 2009-09-08 | 2023-05-04 | SCHäFER WERKE GMBH | Container with a safety rupture point |
DE102012106643B8 (en) * | 2012-07-23 | 2014-03-27 | Progress-Werk Oberkirch Ag | Method for producing a pressure vessel and such a pressure vessel |
US8939314B1 (en) | 2013-07-30 | 2015-01-27 | Progress-Werk-Oberkirch AG | Method for producing a pressure vessel and pressure vessel |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3533406A1 (en) * | 1985-08-23 | 1987-03-05 | Schaefer Werke Gmbh | Pressure-resistant metal container for receiving liquids |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT52598B (en) * | 1910-12-05 | 1912-03-11 | Berlin Anhaltische Maschb Ag | Tank for flammable liquids. |
GB1007594A (en) * | 1961-03-24 | 1965-10-13 | Grundy Teddington Ltd | Improvements in metal casks and like containers and methods of making same |
US3484817A (en) * | 1967-11-07 | 1969-12-16 | Black Swalls & Bryson Inc | Safety pressure relief device |
US4416388A (en) * | 1982-09-20 | 1983-11-22 | Sexton Can Company, Inc. | Pressure relief device |
US4610370A (en) * | 1985-12-30 | 1986-09-09 | Amoco Corporation | Pressure release vent |
-
1987
- 1987-11-08 DE DE19873737977 patent/DE3737977A1/en active Granted
-
1988
- 1988-09-22 EP EP88115536A patent/EP0318657B1/en not_active Expired - Lifetime
- 1988-09-22 DE DE8888115536T patent/DE3870416D1/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3533406A1 (en) * | 1985-08-23 | 1987-03-05 | Schaefer Werke Gmbh | Pressure-resistant metal container for receiving liquids |
Also Published As
Publication number | Publication date |
---|---|
DE3870416D1 (en) | 1992-05-27 |
EP0318657A1 (en) | 1989-06-07 |
DE3737977C2 (en) | 1991-12-05 |
DE3737977A1 (en) | 1989-05-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE3532395C2 (en) | ||
DE60209807T2 (en) | CAN COVER | |
DE2706723C2 (en) | Pressure safety device for pressure vessels or the like. | |
DE69635041T2 (en) | rupture disc | |
DE60200511T2 (en) | Pressure accumulator with safety valve | |
DE2828341A1 (en) | OVERPRESSURE PROTECTION WITH A REVERSION DISC | |
DE2359382A1 (en) | SAFETY DEVICE FOR PRESSURE RELIEF | |
DE3012382A1 (en) | SAFETY GAS CARTRIDGE | |
DE60027771T2 (en) | SAFETY VALVE WITH BREAKING POINT | |
DE2525047A1 (en) | EASY TO OPEN CONTAINER PART AND THE METHOD AND DEVICE FOR THE PRODUCTION THEREOF | |
DE3876696T2 (en) | REVERSE Rupture Disc for Pressure Relief. | |
DE2341077C3 (en) | Sheet metal container lid with at least one rigid closure part that can be moved into the container | |
EP0318657B1 (en) | Container with integral overpressure protection | |
DE2335342A1 (en) | SAFETY DEVICE FOR LIMITING THE PRESSURE OF A FLUID | |
DE3533406C2 (en) | ||
DE69209272T2 (en) | Fragile pressure relief device and manufacturing process | |
EP0686120B1 (en) | Metal container capable of withstanding internal over pressure | |
EP0825131B1 (en) | Container for dispensing liquids by internal gaseous pressure | |
EP0825131A2 (en) | Container for dispensing liquids by internal gaseous pressure | |
DE2708505A1 (en) | Pressure vessel bursting disc - has convex and concave sided partition integral with open ended cylinder and originally flat | |
EP2980468B1 (en) | Protection device for pressurized gas containers | |
DE4319054A1 (en) | Plastic retaining means, in particular for roof fastenings | |
DE2206561A1 (en) | VALVE | |
DE69926360T2 (en) | Reverse Buckling | |
DE19958958A1 (en) | Drinks can closure has seal which deforms plastically under pressure to prevent explosion |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE DE FR GB NL |
|
GBC | Gb: translation of claims filed (gb section 78(7)/1977) | ||
TCNL | Nl: translation of patent claims filed | ||
EL | Fr: translation of claims filed | ||
17P | Request for examination filed |
Effective date: 19890622 |
|
17Q | First examination report despatched |
Effective date: 19910709 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: BLEFA GMBH |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): BE DE FR GB NL |
|
REF | Corresponds to: |
Ref document number: 3870416 Country of ref document: DE Date of ref document: 19920527 |
|
ET | Fr: translation filed | ||
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) | ||
PLBI | Opposition filed |
Free format text: ORIGINAL CODE: 0009260 |
|
26 | Opposition filed |
Opponent name: THIELMANN AG KOMMANDITGESELLSCHAFT Effective date: 19930122 |
|
NLR1 | Nl: opposition has been filed with the epo |
Opponent name: THIELMANN AG. KG. |
|
PLBN | Opposition rejected |
Free format text: ORIGINAL CODE: 0009273 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: OPPOSITION REJECTED |
|
27O | Opposition rejected |
Effective date: 19940408 |
|
NLR2 | Nl: decision of opposition | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19950811 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 19950818 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19950821 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19950823 Year of fee payment: 8 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19960922 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19960930 Ref country code: BE Effective date: 19960930 |
|
BERE | Be: lapsed |
Owner name: BLEFA G.M.B.H. Effective date: 19960930 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19970401 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19970423 Year of fee payment: 9 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19960922 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 19970401 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF THE APPLICANT RENOUNCES Effective date: 19980214 |