WO2020053628A1 - Système d'étanchéité pour fluides gazeux - Google Patents

Système d'étanchéité pour fluides gazeux Download PDF

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Publication number
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
Authority
WO
WIPO (PCT)
Prior art keywords
sealing
pistons
sealing element
sealing system
conical
Prior art date
Application number
PCT/IB2018/057045
Other languages
German (de)
English (en)
Inventor
Erwin Weh
Wolfgang Weh
Original Assignee
Weh Gmbh, Verbindungstechnik
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Weh Gmbh, Verbindungstechnik filed Critical Weh Gmbh, Verbindungstechnik
Priority to PCT/IB2018/057045 priority Critical patent/WO2020053628A1/fr
Publication of WO2020053628A1 publication Critical patent/WO2020053628A1/fr

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Classifications

    • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Devices (AREA)

Abstract

L'invention concerne un système d'étanchéité (1) pour fluides gazeux, comprenant un boîtier (2) et un canal de fluide (3) formé dans celui-ci pour conduire le fluide gazeux, lequel est entouré par deux pistons (4, 5) alignés sur un axe identique et montés de manière à pouvoir coulisser dans le sens axial dans le boîtier (2), et comprenant un élément d'étanchéité annulaire (6) en matière plastique élastique, qui dans une zone des extrémités opposées des deux pistons (4, 5) est logé de manière à pouvoir coulisser dans le sens axial dans une chambre (7) du boîtier (2) qui entoure cette zone de manière annulaire. L'élément d'étanchéité (6) possède au moins une surface d'étanchéité conique (6-1, 6-2) par rapport aux deux pistons (4, 5), laquelle peut être chargée ou déchargée en fonction d'une position fermée ou ouverte des pistons (4, 5) l'un par rapport à l'autre, l'élément d'étanchéité (6) étant supporté par la chambre (7).
PCT/IB2018/057045 2018-09-14 2018-09-14 Système d'étanchéité pour fluides gazeux WO2020053628A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IB2018/057045 WO2020053628A1 (fr) 2018-09-14 2018-09-14 Système d'étanchéité pour fluides gazeux

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2018/057045 WO2020053628A1 (fr) 2018-09-14 2018-09-14 Système d'étanchéité pour fluides gazeux

Publications (1)

Publication Number Publication Date
WO2020053628A1 true WO2020053628A1 (fr) 2020-03-19

Family

ID=63720738

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2018/057045 WO2020053628A1 (fr) 2018-09-14 2018-09-14 Système d'étanchéité pour fluides gazeux

Country Status (1)

Country Link
WO (1) WO2020053628A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
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 (fr) * 1996-08-01 1998-02-12 Weh Gmbh, Verbindungstechnik Passage tournant
WO2000031415A1 (fr) * 1998-11-26 2000-06-02 Continental Teves Ag & Co. Ohg Pompe a piston
US20020129856A1 (en) * 2001-03-15 2002-09-19 Werner Reinelt Electrohydraulic control device
DE20203296U1 (de) * 2002-03-02 2003-04-17 Weh Erwin Anschlußkupplung mit Schalteinheit
DE20203247U1 (de) * 2002-03-02 2003-04-17 Weh Erwin Anschlußkupplung mit Datenschnittstelle
US20040094739A1 (en) * 2002-11-19 2004-05-20 Staubli Faverges Quick coupler for removably joining two pipes
DE102005025916A1 (de) * 2005-06-06 2006-12-07 Marco Systemanalyse Und Entwicklung Gmbh Ventilpatrone
DE202006011681U1 (de) * 2006-07-27 2007-09-06 Weh, Erwin Schaltventil mit Schieber
US20160176700A1 (en) * 2014-12-18 2016-06-23 Opw Fueling Components Inc. Nozzle for Dispensing Pressurized Fluid

Patent Citations (10)

* Cited by examiner, † Cited by third party
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 (fr) * 1996-08-01 1998-02-12 Weh Gmbh, Verbindungstechnik Passage tournant
WO2000031415A1 (fr) * 1998-11-26 2000-06-02 Continental Teves Ag & Co. Ohg Pompe a piston
US20020129856A1 (en) * 2001-03-15 2002-09-19 Werner Reinelt Electrohydraulic control device
DE20203296U1 (de) * 2002-03-02 2003-04-17 Weh Erwin Anschlußkupplung mit Schalteinheit
DE20203247U1 (de) * 2002-03-02 2003-04-17 Weh Erwin Anschlußkupplung mit Datenschnittstelle
US20040094739A1 (en) * 2002-11-19 2004-05-20 Staubli Faverges Quick coupler for removably joining two pipes
DE102005025916A1 (de) * 2005-06-06 2006-12-07 Marco Systemanalyse Und Entwicklung Gmbh Ventilpatrone
DE202006011681U1 (de) * 2006-07-27 2007-09-06 Weh, Erwin Schaltventil mit Schieber
US20160176700A1 (en) * 2014-12-18 2016-06-23 Opw Fueling Components Inc. Nozzle for Dispensing Pressurized Fluid

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