WO2020053628A1 - Sealing system for gaseous fluids - Google Patents
Sealing system for gaseous fluids Download PDFInfo
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- WO2020053628A1 WO2020053628A1 PCT/IB2018/057045 IB2018057045W WO2020053628A1 WO 2020053628 A1 WO2020053628 A1 WO 2020053628A1 IB 2018057045 W IB2018057045 W IB 2018057045W WO 2020053628 A1 WO2020053628 A1 WO 2020053628A1
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- sealing
- pistons
- sealing element
- sealing system
- conical
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/22—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution
- F16K3/24—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members
- F16K3/26—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members with fluid passages in the valve member
- F16K3/265—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members with fluid passages in the valve member with a sleeve sliding in the direction of the flow line
Definitions
- the invention relates to the technical field of sealing technology and in particular to a sealing system for gaseous fluids according to claim 1 and its preferred use according to claim 8.
- Switching valves for oxygen and flammable gases known from sealing technology are usually designed as seat valves.
- the media flow is always led directly over a sealing edge or sealing surface, as a result of which entrained dirt particles cause wear and damage to the valve seat.
- No sealing system known to date meets the common requirements for robustness against contamination with tightness that is always present and also high burn-out safety.
- a sealing system for gaseous fluids with a housing and a fluid channel formed therein for guiding the gaseous fluid, which is enclosed by two axially identically oriented pistons which are axially displaceably mounted in the housing, and with an annular sealing element an elastic plastic material which is accommodated in an axially displaceable manner in a region of opposite ends of the two pistons in a chamber of the housing encircling this region, the sealing element having at least one conical sealing surface with respect to the two pistons, which is dependent on one the pistons can be loaded or relieved against one another in the closed or open position, the sealing element being supported by the chamber.
- An essential point of the sealing system according to the invention is that the sealing element is in sealing contact with the piston and is slidably mounted. Since the sealing element lies outside the direct flow, instead of being made of a solid material, it can be made of a soft material with which a much better seal can be achieved. This is all the more so since the sealing or closing force between the pistons acts symmetrically on the sealing element. In the case of pistons which are moved relative to one another, that is to say their closed positions, a seal is thus created without a support point for the sealing element. When pistons are moved away from one another, that is to say when they are in the open position relative to one another, a seal is formed with the support point of the sealing element in the chamber.
- the sealing element lies outside the direct flow, only a small part of its surface comes into contact with the fluid, which significantly increases the reliability of the sealing system. This is because plastics have the property of easily igniting in a stream of oxygen, for example, and thus causing burnout, particularly at high pressure.
- a labyrinth-like fluid channel between the sealing element and the chamber can be opened by relieving the conical sealing surface, the sealing element functioning as a silencer. At the same time, there is a capillary or suction effect, which ensures particularly reliable ventilation of the fluid channel.
- the opposite ends of the two pistons are designed such that they engage in one another in their closed position. This reduces pressure surges in front of the sealing element and reduces the adiabatic heating of the sealing element, which results in a significantly lower risk of burnout.
- at least one end of the pistons has a conical sealing surface with respect to the conical sealing surface of the sealing element. In the closed position of the pistons, the respective conical sealing surfaces of the piston and the sealing element lie against one another in such a way that the sealing element is pressed axially against one end of a piston and at the same time radially into the chamber, which considerably improves the seal.
- the interacting cones also prevent tilting and thus damage, particularly to a soft sealing element between the ends of the pistons.
- the at least one conical sealing surface of the sealing element and / or the conical sealing surface of at least one end of the pistons lies in an angular range of 20 ° to 35 ° to the piston axis, which corresponds to an ideal range determined by experiment , in which a particularly high level of tightness and reliability of the seal is achieved.
- the sealing element is made of a polyimide material.
- a polyimide material has a particularly good sealing effect and can be used in particular only because of the shielding from the flow and axially symmetrically acting closing force.
- the sealing system described above should preferably be used as a vent for high-pressure valves, in particular for high-pressure valves for oxygen, preferably in the pressure range of up to 420 bar.
- Figure 1 shows an axial section through an inventive sealing system in the closed state
- FIG. 2a shows an axial section through a flap pressure switching valve with a sealing system according to the invention
- Figure 2b shows the enlarged portion of the sealing system according to the invention.
- FIG. 1 shows an axial section through a sealing system 1 according to the invention in the closed state.
- the sealing system 1 has a housing 2 with a fluid channel 3 formed therein for conducting a gaseous fluid, which is supported by two axially displaceable pistons 4 which are axially displaceably mounted in the housing 2.
- annular sealing element 6 made of an elastic sealing material, which is received in an axially displaceably mounted manner in a chamber 7 of the housing 2 encompassing this area.
- the sealing element 6 has two conical sealing surfaces 6-1, 6-2 with respect to the two pistons 4, 5, which can be loaded or unloaded relative to one another depending on a closed or open position of the pistons 4, 5, with the sealing element 6 in the Chamber 7 supports.
- the sealing system 1 shown is preferably used in an oxygen-enriched environment and in this special case is designed as a vent valve which is used in an oxygen-enriched atmosphere under pressure. It is often not possible to use sealing materials that are not flammable at the required pressures in an oxygen atmosphere. It is therefore important to ensure that there is no ignition, since this can burn the sealing element and possibly also other adjacent components of the system.
- the sealing element 6 of the ventilation valve shown here is mounted between the two axially displaceable pistons 4, 5. If both pistons 4, 5 are pressed against each other, the sealing element 6 is clamped between the pistons 4, 5, so that it is against both Piston 4, 5 seals. This prevents gaseous fluid from escaping between the pistons 4, 5; the vent valve is thus closed.
- the end-side cones 6-1, 6-2 of the sealing element 6 interact with corresponding end-side cones 4-1, 5-1 of the respective pistons 4, 5 in order to avoid tilting and thus possible damage to the sealing element 6 at the piston ends and at the same time to enlarge the sealing surface between pistons 4, 5 and sealing element 6.
- the conical sealing surfaces 6-1, 6-2 of the sealing element 6 lie in an angular range from 25 ° ⁇ 5 ° to 30 ° ⁇ 5 ° to a piston axis A.
- the pistons 4, 5 are designed such that they overlap in front of the sealing element 6 when the ventilation valve is closed, that is to say they engage with one another. As a result, pressure surges in front of the sealing element 6 are weakened, which leads to a reduction in the adiabatic heating on the sealing element 6. The risk of oxygen burnout, in particular by igniting the sealing element 6, is thus counteracted.
- a labyrinth-like fluid channel 8 is released between the sealing element 6 and the chamber 7, which on the one hand has a sound-absorbing effect when venting the fluid channel 3 and on the other hand also has a capillary or suction effect, which leads to reliable venting of the fluid channel 3 .
- the fluid channel 8 results both from the overlap of the two piston ends and from the specific cross-sectional shape of the sealing element 6. Its essentially rectangular cross section has a circumferential recess, which ensures a meandering guidance of the gaseous fluid radially outwards , as well as for a particularly good seal of the fluid channel 3 when the vent valve is closed. Because of the shielding of the sealing element 6 from the flow and the axially symmetrically acting closing force, the sealing element 6 can be made of a soft material with a particularly good sealing effect, but which at the same time also has a particularly good sound-absorbing effect.
- the sealing element 6 basically represents such a component. However, since the sealing element 6 is mounted outside the fluid channel 3, it is additionally protected against particles carried in the gaseous fluid. An ignition by particles that strike in the area of the sealing element 6 is therefore excluded.
- the sealing element 6 arranged and designed in this way has proven to be considerably denser than the seals which have been tested and used up to now and has vented particularly reliably.
- FIG. 2a shows an axial section through a flap pressure switching valve 9 with a sealing system according to the invention, which corresponds to that of FIG. 1 except for a different geometry of the sealing element.
- a gaseous fluid flows in the fluid channel 3, the housing 2 of which comes from the inlet 1-1 in the direction of the outlet 0-1.
- An input 1-2 of a switching mechanism 10 is now acted upon by control air, whereby a switching piston 11 moves to the left against the force of a spring 12 and a switching lever 13 moves counterclockwise around a pivot point D.
- the piston 4 is displaced in the direction of the inlet 1-1 and releases the flow through a sealing seat 14, the piston 5 and the piston 4 in the direction of the outlet 0-1. If the input 1-2 is relieved again, the spring 12 pushes the switching piston 11 in the direction of the input 1-2. Again, pressure is applied to the piston 5 and the sealing element 6 '. The piston 4 now moves in the direction of the exit 0-1 and separates from the piston 5. The sealing element 6 then vents the gaseous fluid in the piston 4 and piston 5 in the direction of an outlet 0-2.
- FIG. 2b shows the enlarged partial area of the sealing system G according to the invention in FIG. 2a with pistons 4, 5 in the closed position.
- the sealing element 6 ′ is approximately rectangular in cross section, as a result of which the labyrinthine fluid channel 8 essentially results from the Coverage, that is, the mutual engagement of the two piston ends. Even this simple embodiment of the sealing element 6 'allows a high seal, sound-reducing effect and low risk of burnout of the sealing system G.
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Abstract
The invention relates to a sealing system (1) for gaseous fluids, comprising a housing (2) and a fluid duct (3) formed therein for conveying the gaseous fluid, which fluid duct is enclosed by two axially identically oriented pistons (4, 5) axially movably mounted in the housing (2), and comprising an annular sealing element (6) made from a resilient plastic material, which is received and axially movably mounted in a region of opposing ends of the two pistons (4, 5) in a chamber (7) of the housing (2) enclosing this region in an annular manner. The sealing element (6) has at least one conical sealing surface (6-1, 6-2) relative to the two pistons (4, 5), which conical sealing surface can be loaded or relieved of load relative to one another depending upon a closed or open position of the pistons (4, 5) with respect to one another, the sealing element (6) being supported by the chamber (7).
Description
Dichtungssystem für gasförmige Fluide Sealing system for gaseous fluids
Beschreibung description
Stand der Technik State of the art
Die Erfindung betrifft das technische Gebiet der Dichtungstechnik und insbesondere ein Dichtungssystem für gasförmige Fluide nach Anspruch 1 sowie dessen bevorzugte Verwendung nach Anspruch 8. The invention relates to the technical field of sealing technology and in particular to a sealing system for gaseous fluids according to claim 1 and its preferred use according to claim 8.
Aus der Dichtungstechnik bekannte Schaltventile für Sauerstoff und brennbare Gase sind üblicherweise als Sitzventile ausgeführt. Der Medienstrom wird immer direkt über eine Dichtkante beziehungsweise Dichtfläche geführt, wodurch mitgeführte Schmutzpartikel Verschleiß und Beschädigungen am Ventilsitz verursachen. Kein bislang bekanntes Dichtungssystem erfüllt die gemeinsamen Anforderungen an Robustheit gegen Verschmutzungen bei stets gegebener Dichtigkeit und zudem hoher Ausbrandsicherheit. Switching valves for oxygen and flammable gases known from sealing technology are usually designed as seat valves. The media flow is always led directly over a sealing edge or sealing surface, as a result of which entrained dirt particles cause wear and damage to the valve seat. No sealing system known to date meets the common requirements for robustness against contamination with tightness that is always present and also high burn-out safety.
Aufgabe der Erfindung Object of the invention
Es ist eine Aufgabe der Erfindung, die vorstehenden Probleme zu lösen und ein verbessertes, insbesondere ein besonders widerstandfähiges, dichtes und zuverlässiges Dichtungssystem bereitzustellen. It is an object of the invention to solve the above problems and to provide an improved, in particular a particularly tough, tight and reliable sealing system.
Lösung der Aufgabe Solution of the task
Diese Aufgabe wird durch ein Dichtungssystem für gasförmige Fluide nach Anspruch 1 gelöst, mit einem Gehäuse und einem darin ausgebildeten Fluidkanal zum Leiten des gasförmigen Fluids, der von zwei achsidentisch ausgerichteten und in dem Gehäuse axial verschiebbar gelagerten Kolben umschlossen wird, und mit einem ringförmigen Dichtelement aus einem elastischen Kunststoffmaterial, das in einem Bereich sich gegenüberliegender Enden der beider Kolben in einer ringförmig diesen Bereich umfassenden Kammer des Gehäuses axial verschiebbar gelagert aufgenommen ist, wobei das Dichtelement wenigstens eine konische Dichtfläche gegenüber den beiden Kolben aufweist, die abhängig von einer
gegeneinander geschlossenen oder offenen Stellung der Kolben zueinander belastbar oder entlastbar ist, wobei das Dichtelement durch die Kammer abgestützt wird. This object is achieved by a sealing system for gaseous fluids according to claim 1, with a housing and a fluid channel formed therein for guiding the gaseous fluid, which is enclosed by two axially identically oriented pistons which are axially displaceably mounted in the housing, and with an annular sealing element an elastic plastic material which is accommodated in an axially displaceable manner in a region of opposite ends of the two pistons in a chamber of the housing encircling this region, the sealing element having at least one conical sealing surface with respect to the two pistons, which is dependent on one the pistons can be loaded or relieved against one another in the closed or open position, the sealing element being supported by the chamber.
Ein wesentlicher Punkt des erfindungsgemäßen Dichtungssystems besteht dabei darin, dass das Dichtelement von außen dichtend an den Kolben anliegt und verschiebbar gelagert ist. Da das Dichtelement außerhalb der direkten Strömung liegt, kann es anstatt aus einem festem Material aus einem Weichmaterial hergestellt sein, mit dem eine wesentlich bessere Dichtigkeit erzielbar ist. Dies umso mehr, als zwischen die Dicht- beziehungsweise Schließkraft zwischen den Kolben symmetrisch auf das Dichtelement einwirkt. Bei zueinander verfahrenen Kolben, also deren gegeneinander geschlossener Stellung entsteht damit eine Abdichtung ohne Stützstelle des Dichtelements. Bei voneinander weg verfahrenen Kolben, also bei deren gegeneinander offener Stellung entsteht damit eine Abdichtung mit Stützstelle des Dichtelements in der Kammer. Da das Dichtelement außerhalb der direkten Strömung liegt, kommt zudem nur ein kleiner Teil von dessen Oberfläche überhaupt noch mit dem Fluid in Berührung, womit die Zuverlässigkeit des Dichtungssystems deutlich steigt. Denn Kunststoffe weisen die Eigenschaft auf, sich beispielsweise in einem Sauerstoffstrom leicht zu entzünden und so einen Ausbrand zu verursachen, insbesondere bei hohem Druck. An essential point of the sealing system according to the invention is that the sealing element is in sealing contact with the piston and is slidably mounted. Since the sealing element lies outside the direct flow, instead of being made of a solid material, it can be made of a soft material with which a much better seal can be achieved. This is all the more so since the sealing or closing force between the pistons acts symmetrically on the sealing element. In the case of pistons which are moved relative to one another, that is to say their closed positions, a seal is thus created without a support point for the sealing element. When pistons are moved away from one another, that is to say when they are in the open position relative to one another, a seal is formed with the support point of the sealing element in the chamber. Since the sealing element lies outside the direct flow, only a small part of its surface comes into contact with the fluid, which significantly increases the reliability of the sealing system. This is because plastics have the property of easily igniting in a stream of oxygen, for example, and thus causing burnout, particularly at high pressure.
Bevorzugte Ausführungsformen Preferred embodiments
Bevorzugte Ausführungsformen der vorliegenden Erfindung sind in den jeweiligen Unteransprüchen angegeben. Preferred embodiments of the present invention are specified in the respective subclaims.
In einer ersten bevorzugten Ausführungsform des erfindungsgemäßen Dirchtungssystems ist es vorgesehen, dass durch Entlastung der konischen Dichtfläche ein labyrinthartiger Fluidkanal zwischen dem Dichtelement und der Kammer freigebbar ist, wobei das Dichtelement als Schalldämpfer fungiert. Gleichzeitig entsteht eine Kapillar- beziehungsweise Sogwirkung, die für eine besonders zuverlässige Entlüftung des Fluidkanals sorgt. In a first preferred embodiment of the directional system according to the invention, it is provided that a labyrinth-like fluid channel between the sealing element and the chamber can be opened by relieving the conical sealing surface, the sealing element functioning as a silencer. At the same time, there is a capillary or suction effect, which ensures particularly reliable ventilation of the fluid channel.
In einer zweiten bevorzugten Ausführungsform des erfindungsgemäßen Dichtungssystems ist es vorgesehen, dass die sich gegenüberliegenden Enden der beiden Kolben so ausgestaltet sind, dass sie in deren geschlossener Stellung ineinander eingreifen. Dadurch werden Druckstöße vor dem Dichtelement abgemildert und die adiabatische Erwärmung des Dichtelements reduziert, wodurch eine deutlich geringere Ausbrandgefahr gegeben ist.
In einer weiteren bevorzugten Ausführungsform des erfindungsgemäßen Dichtungssystems ist es vorgesehen, dass wenigstens ein Ende der Kolben gegenüber der konischen Dichtfläche des Dichtelements eine konische Dichtfläche aufweist. In der geschlossenen Stellung der Kolben liegen damit die jeweiligen konischen Dichtflächen von Kolben und Dichtelement so gegeneinander an, dass das Dichtelement axial gegen ein Ende eines Kolbens und gleichzeitig radial in die Kammer gepresst wird, was die Abdichtung erheblich verbessert. Durch die zusammenwirkenden Konen ist zudem ein Verkanten und damit eine Beschädigung insbesondere eines weichen Dichtelements zwischen Enden der Kolben ausgeschlossen. In a second preferred embodiment of the sealing system according to the invention, it is provided that the opposite ends of the two pistons are designed such that they engage in one another in their closed position. This reduces pressure surges in front of the sealing element and reduces the adiabatic heating of the sealing element, which results in a significantly lower risk of burnout. In a further preferred embodiment of the sealing system according to the invention it is provided that at least one end of the pistons has a conical sealing surface with respect to the conical sealing surface of the sealing element. In the closed position of the pistons, the respective conical sealing surfaces of the piston and the sealing element lie against one another in such a way that the sealing element is pressed axially against one end of a piston and at the same time radially into the chamber, which considerably improves the seal. The interacting cones also prevent tilting and thus damage, particularly to a soft sealing element between the ends of the pistons.
In einer weiteren bevorzugten Ausführungsform des erfindungsgemäßen Dichtungssystems ist es vorgesehen, dass die wenigstens eine konische Dichtfläche des Dichtelements und/oder die konische Dichtfläche wenigstens eines Endes der Kolben in einem Winkelbereich von 20° bis 35° zur Kolbenachse liegt, was einem versuchstechnisch ermittelten Idealbereich entspricht, in dem eine besonders hohe Dichtigkeit und Zuverlässigkeit der Abdichtung erzielt wird. In a further preferred embodiment of the sealing system according to the invention, it is provided that the at least one conical sealing surface of the sealing element and / or the conical sealing surface of at least one end of the pistons lies in an angular range of 20 ° to 35 ° to the piston axis, which corresponds to an ideal range determined by experiment , in which a particularly high level of tightness and reliability of the seal is achieved.
In einer weiteren bevorzugten Ausführungsform des erfindungsgemäßen Dichtungssystems ist es vorgesehen, dass das Dichtelement aus einem Polyimid-Material hergestellt ist. Ein derartiges Weichmaterial verfügt über eine besonders gute Dichtwirkung und ist insbesondere nur wegen der Abschirmung von der Strömung und axialsymetrisch einwirkender Schließkraft einsetzbar. In a further preferred embodiment of the sealing system according to the invention, it is provided that the sealing element is made of a polyimide material. Such a soft material has a particularly good sealing effect and can be used in particular only because of the shielding from the flow and axially symmetrically acting closing force.
Das vorstehend beschriebene Dichtungssystem soll wegen seiner besonderen Dichtigkeit und Zuverlässigkeit bevorzugt als Entlüftung für Hochdruckventile, insbesondere für Hochdruckventile für Sauerstoff, bevorzugt im Druckbereich von bis zu 420 bar eingesetzt werden. Because of its special tightness and reliability, the sealing system described above should preferably be used as a vent for high-pressure valves, in particular for high-pressure valves for oxygen, preferably in the pressure range of up to 420 bar.
Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind ohne den Rahmen der vorliegenden Erfindung zu verlassen. It goes without saying that the features mentioned above and those yet to be explained below can be used not only in the respectively specified combination but also in other combinations or on their own without departing from the scope of the present invention.
Kurze Beschreibung der Figuren Brief description of the figures
Bevorzugte Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und
werden in der nachfolgenden Beschreibung näher erläutert, wobei sich gleiche Bezugszeichen auf gleiche oder ähnliche oder funktional gleiche Bauteile beziehen. Es zeigen: Preferred embodiments of the invention are shown in the drawings and are explained in more detail in the following description, the same reference symbols referring to the same or similar or functionally identical components. Show it:
Figur 1 einen Axialschnitt durch ein erfindungsgemäßes Dichtungssystem in geschlossenem Zustand; Figure 1 shows an axial section through an inventive sealing system in the closed state;
Figur 2a einen Axialschnitt durch ein Flochdruckschaltventil mit einem erfindungsgemäßen Dichtungssystem, und 2a shows an axial section through a flap pressure switching valve with a sealing system according to the invention, and
Figur 2b den vergrößerten Teilbereich des erfindungsgemäßen Dichtungssystems in Figure 2b shows the enlarged portion of the sealing system according to the invention in
Figur 2a. Figure 2a.
Figur 1 zeigt einen Axialschnitt durch ein erfindungsgemäßes Dichtungssystem 1 in geschlossenem Zustand. Das Dichtungssystem 1 weist ein Gehäuse 2 mit einem darin ausgebildeten Fluidkanal 3 zum Leiten eines gasförmigen Fluids auf, der von zwei achsidentisch ausgerichteten und in dem Gehäuse 2 axial verschiebbar gelagerten Kolben 4,FIG. 1 shows an axial section through a sealing system 1 according to the invention in the closed state. The sealing system 1 has a housing 2 with a fluid channel 3 formed therein for conducting a gaseous fluid, which is supported by two axially displaceable pistons 4 which are axially displaceably mounted in the housing 2.
5 umschlossen ist. In dem Bereich sich gegenüberliegender Enden der beiden Kolben 4, 5 ist ein ringförmiges Dichtelement 6 aus einem elastischen Dichtmaterial angeordnet, das in einer ringförmig diesen Bereich umfassenden Kammer 7 des Gehäuses 2 axial verschiebbar gelagert aufgenommen ist. Das Dichtelement 6 weist zwei konische Dichtflächen 6-1, 6-2 gegenüber den beiden Koben 4, 5 auf, die abhängig von einer gegeneinander geschlossenen oder offenen Stellung der Kolben 4, 5 zueinander belastbar oder entlastbar sind, wobei dich das Dichtelement 6 in der Kammer 7 abstützt. 5 is enclosed. In the area of opposite ends of the two pistons 4, 5 there is an annular sealing element 6 made of an elastic sealing material, which is received in an axially displaceably mounted manner in a chamber 7 of the housing 2 encompassing this area. The sealing element 6 has two conical sealing surfaces 6-1, 6-2 with respect to the two pistons 4, 5, which can be loaded or unloaded relative to one another depending on a closed or open position of the pistons 4, 5, with the sealing element 6 in the Chamber 7 supports.
Das gezeigte Dichtungssystem 1 wird bevorzugt in sauerstoffangereicherter Umgebung eingesetzt und ist in diesem speziellen Fall als ein Entlüftungsventil ausgeprägt, das in einer mit Sauerstoff angereicherten Atmosphäre unter Druckbeaufschlagung zum Einsatz kommt. Häufig ist es dabei nicht möglich, Dichtwerkstoffe zu verwenden, die bei den geforderten Drücken in Sauerstoffatmosphäre nicht brennbar sind. Es gilt also sicherzustellen, dass es zu keiner Zündung kommt, da dies zum Verbrennen des Dichtelements und gegebenenfalls auch weiterer angrenzender Komponenten des Systems führen kann. The sealing system 1 shown is preferably used in an oxygen-enriched environment and in this special case is designed as a vent valve which is used in an oxygen-enriched atmosphere under pressure. It is often not possible to use sealing materials that are not flammable at the required pressures in an oxygen atmosphere. It is therefore important to ensure that there is no ignition, since this can burn the sealing element and possibly also other adjacent components of the system.
Das Dichtelement 6 des hier gezeigten Entlüftungsventils ist dafür zwischen den zwei axial verschiebbaren Kolben 4, 5 gelagert. Werden beide Kolben 4, 5 gegeneinander gedrückt, so wird das Dichtelement 6 zwischen den Kolben 4, 5 eingeklemmt, so dass es gegen beide
Kolben 4, 5 abdichtet. Dadurch wird ein Austritt gasförmigen Fluids zwischen den Kolben 4, 5 unterbunden; das Entlüftungsventil ist somit geschlossen. The sealing element 6 of the ventilation valve shown here is mounted between the two axially displaceable pistons 4, 5. If both pistons 4, 5 are pressed against each other, the sealing element 6 is clamped between the pistons 4, 5, so that it is against both Piston 4, 5 seals. This prevents gaseous fluid from escaping between the pistons 4, 5; the vent valve is thus closed.
Die endseitigen Konen 6-1, 6-2 des Dichtelements 6 wirken dabei mit entsprechenden endseitigen Konen 4-1, 5-1 der jeweiligen Kolben 4, 5 zusammen, um eine Verkantung und damit mögliche Beschädigung des Dichtelements 6 an den Kolbenenden zu vermeiden und zugleich die Dichtfläche zwischen Kolben 4, 5 und Dichtelement 6 zu vergrößern. Idealerweise liegen die konischen Dichtflächen 6-1, 6-2 des Dichtelements 6 dabei in einem Winkelbereich von 25° ± 5° bis 30° ± 5° zu einer Kolbenachse A. The end-side cones 6-1, 6-2 of the sealing element 6 interact with corresponding end-side cones 4-1, 5-1 of the respective pistons 4, 5 in order to avoid tilting and thus possible damage to the sealing element 6 at the piston ends and at the same time to enlarge the sealing surface between pistons 4, 5 and sealing element 6. Ideally, the conical sealing surfaces 6-1, 6-2 of the sealing element 6 lie in an angular range from 25 ° ± 5 ° to 30 ° ± 5 ° to a piston axis A.
Die Kolben 4, 5 sind dabei derart gestaltet, dass sie sich bei geschlossenem Entlüftungsventil vor dem Dichtelement 6 überlagern, also ineinander greifen. Dadurch werden Druckstöße vor dem Dichtelement 6 abgeschwächt, was zu einer Reduzierung der adiabatischen Erwärmung an dem Dichtelement 6 führt. Der Gefahr eines Sauerstoffausbrands, insbesondere durch ein Zünden des Dichtelements 6 wird somit entgegen gewirkt. The pistons 4, 5 are designed such that they overlap in front of the sealing element 6 when the ventilation valve is closed, that is to say they engage with one another. As a result, pressure surges in front of the sealing element 6 are weakened, which leads to a reduction in the adiabatic heating on the sealing element 6. The risk of oxygen burnout, in particular by igniting the sealing element 6, is thus counteracted.
Werden die Kolben 4, 5 dagegen auseinander bewegt, so ist das Dichtelement 6 zwischen beiden Kolben 4, 5 frei beweglich und das gasförmige Fluid kann zwischen diesen entweichen; das Entlüftungsventil ist also geöffnet. However, if the pistons 4, 5 are moved apart, the sealing element 6 can move freely between the two pistons 4, 5 and the gaseous fluid can escape between them; the vent valve is therefore open.
Bei geöffnetem Entlüftungsventil wird dabei zwischen dem Dichtelement 6 und der Kammer 7 ein labyrinthartiger Fluidkanal 8 freigegeben, der bei der Entlüftung des Fluidkanlas 3 zum einen schalldämpfend wirkt und zum anderen auch eine Kapillar- oder Sogwirkung entfaltet, die zu einer zuverlässigen Entlüftung des Fluidkanals 3 führt. Der Fluidkanal 8 ergibt sich dabei sowohl aus der Überdeckung der beiden Kolbenenden, als auch aus der spezifischen Querschnittsform des Dichtelements 6. Dessen im wesentlichen rechteckiger Querschnitt weist nämlich eine umlaufende Ausnehmung aus, die für eine radial nach außen gerichtete, mäandernde Führung des gasförmigen Fluids sorgt, genauso wie für eine besonders gute Abdichtung des Fluidkanals 3 bei geschlossenem Entlüftungsventil. Wegen der Abschirmung des Dichtelements 6 von der Strömung und der axialsymetrisch einwirkenden Schließkraft kann das Dichtelement 6 aus einem Weichmaterial mit besonders guter Dichtwirkung hergestellt sein, das aber gleichzeitig auch eine besonders gute schalabsorbierende Wirkung aufweist. When the vent valve is open, a labyrinth-like fluid channel 8 is released between the sealing element 6 and the chamber 7, which on the one hand has a sound-absorbing effect when venting the fluid channel 3 and on the other hand also has a capillary or suction effect, which leads to reliable venting of the fluid channel 3 . The fluid channel 8 results both from the overlap of the two piston ends and from the specific cross-sectional shape of the sealing element 6. Its essentially rectangular cross section has a circumferential recess, which ensures a meandering guidance of the gaseous fluid radially outwards , as well as for a particularly good seal of the fluid channel 3 when the vent valve is closed. Because of the shielding of the sealing element 6 from the flow and the axially symmetrically acting closing force, the sealing element 6 can be made of a soft material with a particularly good sealing effect, but which at the same time also has a particularly good sound-absorbing effect.
Ein weiterer möglicher Zündmechanismus ist grundsätzlich auch die Erzeugung von Funken durch das Aufschlagen von in der Strömung befindlichen Partikeln an in
Sauerstoffatmosphäre brennbaren Komponenten oder in deren unmittelbarer Umgebung. Das Dichtelement 6 stellt grundsätzlich eine solche Komponente dar. Da das Dichtelement 6 aber außerhalb des Fluidkanals 3 gelagert ist, wird es zusätzlich vor in dem gasförmigen Fluid mitgeführten Partikeln geschützt. Eine Zündung durch Partikel, die im Bereich des Dichtelements 6 einschlagen, ist damit ausgeschlossen. Another possible ignition mechanism is in principle the generation of sparks by the impact of particles in the flow at in Oxygen atmosphere flammable components or in their immediate surroundings. The sealing element 6 basically represents such a component. However, since the sealing element 6 is mounted outside the fluid channel 3, it is additionally protected against particles carried in the gaseous fluid. An ignition by particles that strike in the area of the sealing element 6 is therefore excluded.
Das derart angeordnete und gestaltete Dichtelement 6 hat sich als wesentlich dichter als die bisher geprüften und verwendeten Dichtungen erwiesen und entlüftet besonders zuverlässig. The sealing element 6 arranged and designed in this way has proven to be considerably denser than the seals which have been tested and used up to now and has vented particularly reliably.
Figur 2a zeigt einen Axialschnitt durch ein Flochdruckschaltventil 9 mit einem erfindungsgemäßen Dichtungssystem , das bis auf eine abweichende Geometrie des Dichtungselements dem der Figur 1 entspricht. Ein gasförmiges Fluid strömt dabei in dem Fluidkanal 3 dessen Gehäuses 2 vom Eingang 1-1 kommend in Richtung Ausgang 0-1. Es liegt dabei Druck an dem Kolben 5 und dem Dichtelement 6' an. Es wird nun ein Eingang 1-2 eines Schaltmechanismus 10 mit Steuerluft beaufschlagt, womit sich ein Schaltkolben 11 entgegen die Kraft einer Feder 12 nach links bewegt und einen Schalthebel 13 entgegen dem Uhrzeigersinn um einen Drehpunkt D bewegt. Dadurch wird der Kolben 4 in Richtung des Eingangs 1-1 verschoben und gibt den Durchfluss durch einen Dichtsitz 14, den Kolben 5 und den Kolben 4 in Richtung Ausgang 0-1 frei. Wird der Eingang 1-2 wieder entlastet, schiebt die Feder 12 den Schaltkolben 11 in Richtung Eingang 1-2. Es liegt wiederum Druck an dem Kolben 5 und des Dichtelements 6' an. Der Kolben 4 bewegt sich jetzt in Richtung des Ausgangs 0-1 und trennt sich von dem Kolben 5 ab. Das Dichtelement 6 entlüftet dann das gasförmige Fluid im Kolben 4 und Kolben 5 in Richtung eines Ausgangs 0-2. FIG. 2a shows an axial section through a flap pressure switching valve 9 with a sealing system according to the invention, which corresponds to that of FIG. 1 except for a different geometry of the sealing element. A gaseous fluid flows in the fluid channel 3, the housing 2 of which comes from the inlet 1-1 in the direction of the outlet 0-1. There is pressure on the piston 5 and the sealing element 6 '. An input 1-2 of a switching mechanism 10 is now acted upon by control air, whereby a switching piston 11 moves to the left against the force of a spring 12 and a switching lever 13 moves counterclockwise around a pivot point D. As a result, the piston 4 is displaced in the direction of the inlet 1-1 and releases the flow through a sealing seat 14, the piston 5 and the piston 4 in the direction of the outlet 0-1. If the input 1-2 is relieved again, the spring 12 pushes the switching piston 11 in the direction of the input 1-2. Again, pressure is applied to the piston 5 and the sealing element 6 '. The piston 4 now moves in the direction of the exit 0-1 and separates from the piston 5. The sealing element 6 then vents the gaseous fluid in the piston 4 and piston 5 in the direction of an outlet 0-2.
Figur 2b zeigt den vergrößerten Teilbereich des erfindungsgemäßen Dichtungssystems G in Figur 2a mit in geschlossener Stellung befindlichen Kolben 4, 5. Im Gegensatz zur Figur 1 ist hier das Dichtelement 6' im Querschnitt ungefähr rechteckig ausgeführt, wodurch sich der labyrinthartige Fluidkanal 8 im wesentlichen aus der Überdeckung, also dem gegenseitigen Eingriff der beiden Kolbenenden ergibt. Schon diese einfache Ausführungsform des Dichtelements 6' lässt dabei eine hohe Abdichtung, schallmindernde Wirkung und geringe Ausbrandgefahr des Dichtsystems G zu.
FIG. 2b shows the enlarged partial area of the sealing system G according to the invention in FIG. 2a with pistons 4, 5 in the closed position. In contrast to FIG. 1, the sealing element 6 ′ is approximately rectangular in cross section, as a result of which the labyrinthine fluid channel 8 essentially results from the Coverage, that is, the mutual engagement of the two piston ends. Even this simple embodiment of the sealing element 6 'allows a high seal, sound-reducing effect and low risk of burnout of the sealing system G.
Claims
1. Dichtungssystem (1) für gasförmige Fluide, mit einem Gehäuse (2) und einem darin ausgebildeten Fluidkanal (3) zum Leiten des gasförmigen Fluids, der von zwei achsidentisch ausgerichteten und in dem Gehäuse (2) axial verschiebbar gelagerten Kolben (4, 5) umschlossen wird, und mit einem ringförmigen Dichtelement (6) aus einem elastischen Kunststoffmaterial, das in einem Bereich sich gegenüberliegender Enden der beider Kolben (4, 5) in einer ringförmig diesen Bereich umfassenden Kammer (7) des Gehäuses (2) axial verschiebbar gelagert aufgenommen ist, wobei das Dichtelement (6) wenigstens eine konische Dichtfläche (6-1, 6-2) gegenüber den beiden Kolben (4, 5) aufweist, die abhängig von einer gegeneinander geschlossenen oder offenen Stellung der Kolben (4, 5) zueinander belastbar oder entlastbar ist, wobei das Dichtelement (6) durch die Kammer (7) abgestützt wird. 1. Sealing system (1) for gaseous fluids, with a housing (2) and a fluid channel (3) formed therein for guiding the gaseous fluid, the pistons (4, 5 ) is enclosed, and with an annular sealing element (6) made of an elastic plastic material, which is axially displaceably mounted in a region of opposite ends of the two pistons (4, 5) in a ring-shaped area (7) of the housing (2) The sealing element (6) has at least one conical sealing surface (6-1, 6-2) with respect to the two pistons (4, 5), which are dependent on a closed or open position of the pistons (4, 5) relative to one another can be loaded or relieved, the sealing element (6) being supported by the chamber (7).
2. Dichtungssystem (1) nach Anspruch 1, bei dem durch Entlastung der konischen Dichtfläche (6-1, 6-2) ein labyrinthartiger Fluidkanal (8) zwischen dem Dichtelement (6) und der Kammer (7) freigebbar ist. 2. Sealing system (1) according to claim 1, in which a labyrinthine fluid channel (8) between the sealing element (6) and the chamber (7) can be released by relieving the conical sealing surface (6-1, 6-2).
3. Dichtungssystem (1) nach Anspruch 1 oder 2, bei dem die sich gegenüberliegenden Enden der beiden Kolben (4, 5) so ausgestaltet sind, dass sie in deren geschlossener Stellung ineinander eingreifen. 3. Sealing system (1) according to claim 1 or 2, wherein the opposite ends of the two pistons (4, 5) are designed so that they engage in one another in their closed position.
4. Dichtungssystem (1) nach einem der vorstehenden Ansprüche, bei dem wenigstens ein Ende der Kolben (4, 5) gegenüber der konischen Dichtfläche (6-1, 6-2) des Dichtelement (6) eine konische Dichtfläche (4-1, 4. Sealing system (1) according to one of the preceding claims, in which at least one end of the pistons (4, 5) with respect to the conical sealing surface (6-1, 6-2) of the sealing element (6) has a conical sealing surface (4-1,
5-1) aufweist. 5-1).
6. Dichtungssystem (1) nach einem der vorstehenden Ansprüche, bei dem die wenigstens eine konische Dichtfläche (6-1, 6-2) des Dichtelements (6) in einem Winkelbereich von 20° bis 35° zur Kolbenachse (A) liegen. 6. Sealing system (1) according to one of the preceding claims, wherein the at least one conical sealing surface (6-1, 6-2) of the sealing element (6) lie in an angular range from 20 ° to 35 ° to the piston axis (A).
7. Dichtungssystem (1) nach einem der vorstehenden Ansprüche, bei dem das Dichtelement (6) aus einem Polyimid-Material hergestellt ist.
Verwendung des Dichtungssystems (1) nach einem der vorstehenden Ansprüche als Entlüftung für Hochdruckventile, insbesondere für Hochdruckventile für Sauerstoff, bevorzugt im Druckbereich von bis zu 420 bar.
7. Sealing system (1) according to one of the preceding claims, wherein the sealing element (6) is made of a polyimide material. Use of the sealing system (1) according to one of the preceding claims as a vent for high pressure valves, in particular for high pressure valves for oxygen, preferably in the pressure range of up to 420 bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/IB2018/057045 WO2020053628A1 (en) | 2018-09-14 | 2018-09-14 | Sealing system for gaseous fluids |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/IB2018/057045 WO2020053628A1 (en) | 2018-09-14 | 2018-09-14 | Sealing system for gaseous fluids |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2020053628A1 true WO2020053628A1 (en) | 2020-03-19 |
Family
ID=63720738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2018/057045 WO2020053628A1 (en) | 2018-09-14 | 2018-09-14 | Sealing system for gaseous fluids |
Country Status (1)
| Country | Link |
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| WO (1) | WO2020053628A1 (en) |
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|---|---|---|---|---|
| US3018635A (en) * | 1958-05-05 | 1962-01-30 | Aro Equipment Corp | Combination valve for oxygen converters |
| WO1998005898A1 (en) * | 1996-08-01 | 1998-02-12 | Weh Gmbh, Verbindungstechnik | Rotary passage |
| WO2000031415A1 (en) * | 1998-11-26 | 2000-06-02 | Continental Teves Ag & Co. Ohg | Piston pump |
| US20020129856A1 (en) * | 2001-03-15 | 2002-09-19 | Werner Reinelt | Electrohydraulic control device |
| DE20203247U1 (en) * | 2002-03-02 | 2003-04-17 | Weh, Erwin, 89257 Illertissen | Connection coupling with data interface |
| DE20203296U1 (en) * | 2002-03-02 | 2003-04-17 | Weh, Erwin, 89257 Illertissen | Connection coupling with switching unit |
| US20040094739A1 (en) * | 2002-11-19 | 2004-05-20 | Staubli Faverges | Quick coupler for removably joining two pipes |
| DE102005025916A1 (en) * | 2005-06-06 | 2006-12-07 | Marco Systemanalyse Und Entwicklung Gmbh | Color-coded differential valve cartridge, used in underground water-hydraulic systems, includes valve- and control pistons with selective carrier assistance |
| DE202006011681U1 (en) * | 2006-07-27 | 2007-09-06 | Weh, Erwin | Switching valve with slide |
| US20160176700A1 (en) * | 2014-12-18 | 2016-06-23 | Opw Fueling Components Inc. | Nozzle for Dispensing Pressurized Fluid |
-
2018
- 2018-09-14 WO PCT/IB2018/057045 patent/WO2020053628A1/en active Application Filing
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3018635A (en) * | 1958-05-05 | 1962-01-30 | Aro Equipment Corp | Combination valve for oxygen converters |
| WO1998005898A1 (en) * | 1996-08-01 | 1998-02-12 | Weh Gmbh, Verbindungstechnik | Rotary passage |
| WO2000031415A1 (en) * | 1998-11-26 | 2000-06-02 | Continental Teves Ag & Co. Ohg | Piston pump |
| US20020129856A1 (en) * | 2001-03-15 | 2002-09-19 | Werner Reinelt | Electrohydraulic control device |
| DE20203247U1 (en) * | 2002-03-02 | 2003-04-17 | Weh, Erwin, 89257 Illertissen | Connection coupling with data interface |
| DE20203296U1 (en) * | 2002-03-02 | 2003-04-17 | Weh, Erwin, 89257 Illertissen | Connection coupling with switching unit |
| US20040094739A1 (en) * | 2002-11-19 | 2004-05-20 | Staubli Faverges | Quick coupler for removably joining two pipes |
| DE102005025916A1 (en) * | 2005-06-06 | 2006-12-07 | Marco Systemanalyse Und Entwicklung Gmbh | Color-coded differential valve cartridge, used in underground water-hydraulic systems, includes valve- and control pistons with selective carrier assistance |
| DE202006011681U1 (en) * | 2006-07-27 | 2007-09-06 | Weh, Erwin | Switching valve with slide |
| US20160176700A1 (en) * | 2014-12-18 | 2016-06-23 | Opw Fueling Components Inc. | Nozzle for Dispensing Pressurized Fluid |
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