[go: up one dir, main page]

WO1989003491A1 - Joint torique souple - Google Patents

Joint torique souple Download PDF

Info

Publication number
WO1989003491A1
WO1989003491A1 PCT/GB1988/000846 GB8800846W WO8903491A1 WO 1989003491 A1 WO1989003491 A1 WO 1989003491A1 GB 8800846 W GB8800846 W GB 8800846W WO 8903491 A1 WO8903491 A1 WO 8903491A1
Authority
WO
WIPO (PCT)
Prior art keywords
strip
ring seal
coiled
flexible ring
flexible
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.)
Ceased
Application number
PCT/GB1988/000846
Other languages
English (en)
Inventor
Terence Peter Nicholson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Specialist Sealing Ltd
Original Assignee
Specialist Sealing Ltd
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 Specialist Sealing Ltd filed Critical Specialist Sealing Ltd
Publication of WO1989003491A1 publication Critical patent/WO1989003491A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/12—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering
    • F16J15/121—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering with metal reinforcement
    • F16J15/125—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering with metal reinforcement generally perpendicular to the surfaces
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/021—Sealings between relatively-stationary surfaces with elastic packing
    • F16J15/022—Sealings between relatively-stationary surfaces with elastic packing characterised by structure or material
    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/16—Flanged joints characterised by the sealing means
    • F16L23/18—Flanged joints characterised by the sealing means the sealing means being rings
    • F16L23/20—Flanged joints characterised by the sealing means the sealing means being rings made exclusively of metal

Definitions

  • This invention relates to a flexible ring seal which has been specifically but not exclusively devised for sealing the joints between the flanges of glass lined pressure vessels and their associated piping systems.
  • ring seals are unsatisfactory. Firstly, in view of lack of flexibility it is most difficult to obtain an efficient sealing fit, and to achieve this many man-hours of uiork may be needed, which is extremely expensive. Secondly the known ring seals constitute a health hazard because asbestos is extensively used in their construction. In particular, asbestos millboard, which is one of the most dangerous forms of asbestos is a commonly used ingredient.
  • the general object of the invention is to provide a more flexible and efficient ring seal for this and other similar sealing purposes and also one which is safe and easy to manufacture.
  • a flexible ring seal comprises a coiled strip of flexible material enclosed within an envelope made of an inert material having a low friction co-efficient, the strip having at least one transverse convolution and-side margins of increased thickness such that in the coiled structure the adjacent convoluted parts are separated by air spaces.
  • the strip may be made of stainless steel or any other ferrous or non-ferrous metal or alloy preferably capable of imparting resilience to the strip.
  • the convoluted base strip may comprise layers laminated together.
  • the coiled strip may be made of synthetic plastics or elastomeric material which may have an embedded metal reinforcing strip.
  • the ring seal may further comprise a groove closure ring.
  • Fig. 1 is a cross-section of a metal-fabricated strip preparatory to coiling
  • Fig. 2 analogous to Fig. 1, illustrates an alternative profile strip
  • Fig. 3 is a radial cross-section of the main part of a ring seal utilising the strip shown in Fig. 2;
  • Fig. 4 is a fragmentary radial cross-section of a complete ring seal utilising the strip shown in Fig. 1;
  • Figs. 5, 6 and 7 are cross-sections of three typical groove closure rings
  • Figs. 8 and 9 are fragmentary radial cross-sections of two other ring seal embodiments
  • Figs. 10 and 11 are radial cross-sections of the coiled strip forming the main part of two other ring seal embodiments;
  • Fig. 12 is a fragmentary plan view of a ring seal
  • Fig. 13 is a cross section, analogous to Fig, 1, illustrating a further strip profile.
  • the ring seals according to the invention comprise a coiled strip structure which is enclosed in an envelope made of PTFE.
  • this structure is made of metal it comprises, as shown in Fig, 1 or Fig. 2, an assembly of three metal strips namely two rectangular section strips 1 made of solid drawn metal (wire) and a roll-formed strip 2 of uniform thickness, which is thin in relation to its width and formed centrally with at least one arch-shaped convolution 11 (a single convolution being illustrated).
  • At opposite sides of the central convolution 11 are respective plane flanges 12, lying in a common plane, with the convoluted intermediate region lying entirely on one side of this plane.
  • this formed strip 2 leaves the rolling machine it is fed through two guide, rollers onto which the two wires 1 are fed accurately onto positions in contact with the respective side flanges 12, with the outside edges of the rectangular wires aligned with the outside edges of the flanges.
  • the wires are secured to the flanges by resistance welds 3 at regular intervals, for example 10 millimeters. These wires form side margins for the strip, of increased thickness.
  • the convolution 11 and margins are of substantially equal height in the illustrated strips.
  • brazing paste 4 As the compound strip leaves the machine, globules of brazing paste 4 are deposited in the corners between the. convolution of the strip 2 and the wires 1.
  • the compound strip leaves the machine, having been welded and "pasted" it is fed onto the mandrel of a coiling machine and wound upon it, the end of the strip being welded at both sides to the coil when a first coil has been established.
  • the mandrel is then expanded so as to grip the coiled strip firmly, whereupon further coiling occurs, the inside diameter of the ring being controlled by the diameter of the mandrel, until the desired outside diameter is attained.
  • the strip 1, 2 is Argon-arc welded at the intended final point of contact between the strip and its last wound coil and is severed from the coil structure which is then removed from the mandrel and transferred to a high temperature furnace which is characterised by vacuum and an inert atmosphere. This causes the brazing paste to become liquid and to flow by capillary action to form a continuous brazed fillet along the junction between the innermost sides of the wires 1 and the convolution of the strip 2.
  • perforations spaced along the strip prior to form rolling these perforations preferably having the form of slots which are elongated transversely across the strip.
  • the slots typically measure 1.57 mm by 6.65 mm, the interval between adjacent sides of the slots being 1.57 mm.
  • greater flexibility can be achieved if the strip 2 is of laminated formation and formed preferably of three, four or five equal thickness layers.
  • Figs. 1 and 2 typical dimensions of the wires 1 and the strip 2 are indicated for two compound strips whereof the central convolutions are somewhat differently shaped, different radii A, B and C being indicated.
  • Fig. 3 illustrates the coiled structure which is formed by coiling the compound strip which is formed as shown in Fig. 2.
  • The. coiled structure is enclosed within an envelope 5 made of inert low friction co-efficient material such as PTFE.
  • This envelope may be made either from a ring which has been slit radially inwards or two rings fused or bonded together at its inside diameter, as shown in Fig. 4, or it may be milled instead of slit as shown in Figs. 8 and 9. Slit envelopes are usually used for lower pressure applications, and milled envelopes for higher pressure ones.
  • a closure ring 6 as shown for instance in Fig, 4.
  • This ring 6 may typically be dimensioned and have one annular rib 6A as also shown in Fig. 5 or Fig. 6 or it may alternatively be shaped as shown in Fig, 7) which again shows typical relative dimensions, or Fig. 9 and have two annular ribs 6A which face the grooves of the innermost coil.
  • Fig. 9 shows a strip with three convolutions 11, all lying on the same side of the plane of the flanges 12 and not exceeding the. height of the margins 1 when relaxed.
  • closure ring 6 The purpose of the closure ring 6 is to prevent any possibility of the. envelope. 5 being forced under pressure into the adjacent groove or grooves formed by the or each convolution with a consequent risk of splitting of the envelope.
  • Suitable alloys which can be employed in the. fabrication of the coiled structures described above are for instance, the Nimonic and Inconel alloys, Waspalloy, Hastelloy and similar other alloys of which the resilience characteristic can be greatly enhanced by an ageing process.
  • ring seal there may be welded to one. face of the ring seal one or more radial metal tabs 7 (Fig. 12). Conveniently there are four such tabs equally spaced around the outer circumference of the ring seal.
  • the coiled structure need not necessarily wholly consist of metallic material but may instead comprise a coiled transversely convoluted strip of synthetic plastic or elastomeric material having side margins M of increased thickness with adjoining coils adhesively secured to one another and preferably incorporating an embedded metallic reinforcing strip R extending into the thicker margins, as illustrated in Figs. 10 and 11.
  • the strip may have one or more convolutions, in general an odd number of convolutions, as can be seen for example in Figures 9 and 11.
  • Figure 13 shows a further metal ring seal with three convolutions in the strip cross section.
  • Each convolution is semicircular in cross section and the convolutions are interconnected by straight regions.
  • the outermost convolutions are connected to the side flanges by outward joggled or dog-leg regions 10, Typical dimensions in millimeters are. shown, by way of example only, in Figure 13,
  • the convolutions all lie on one side of the. plane of the flanges, but the two outer convolutions are higher than the margins and nest in the convolutions of the adjacent layer of the coil.
  • This seal is made in a manner similar to that described with reference to the seal shown in Figure 1 and is provided with a low-friction envelope as already described.
  • the success of the ring seal derives principally from the air space which is available between the or each convolution and the adjacent parts of the coil and it is the availability of this space which allows the ring seal when under compression to conform with the utmost flexibility to the changing dimension between the flanges to be sealed.
  • the ring seal does not act in the same manner as a block of inert cellular material which can readily be compressed.
  • it is a very complex resilient structure such that under compression the convolutions become flat and this has the effect of forcibly increasing the diameter of the apex of each of the convolutions.
  • this compressing effect is resisted by the natural hoop strength of the material with the consequence that when the compression mode is released it tends to return very closely to its original dimension.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gasket Seals (AREA)

Abstract

Joint torique souple conçu notamment pour étancher les jointures entre les rebords de récipients sous pression à chemise en verre et leurs systèmes de tuyauterie associée, comprenant une bande enroulée (1, 2) de matière souple enfermée à l'intérieur d'une enveloppe (5) de matière inerte à faible coefficient de frottement telle que PTFE (polytétrafluoroéthylène). La bande comporte au moins une spire transversale ainsi que des marges latérales d'épaisseur augmentée de sorte que dans la structure enroulée les parties spirales adjacentes sont séparées par des espaces d'air. En outre on a prévu de préférence un anneau de fermeture (6) faisant face à l'enroulement le plus à l'intérieur radialement de la structure enroulée, de manière à empêcher l'entrée accidentelle de l'enveloppe dans un évidement formé par une spire. La bande peut être en acier inoxydable ou en tout autre métal ou alliage ferreux ou non ferreux pouvant de préférence conférer une élasticité à la bande. Dans un autre mode de réalisation la bande enroulée peut être en plastique synthétique ou en matière élastomère dans laquelle est insérée une bande de renforcement métallique.
PCT/GB1988/000846 1987-10-13 1988-10-13 Joint torique souple Ceased WO1989003491A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878724010A GB8724010D0 (en) 1987-10-13 1987-10-13 Flexible ring seal
GB8724010 1987-10-13

Publications (1)

Publication Number Publication Date
WO1989003491A1 true WO1989003491A1 (fr) 1989-04-20

Family

ID=10625245

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1988/000846 Ceased WO1989003491A1 (fr) 1987-10-13 1988-10-13 Joint torique souple

Country Status (3)

Country Link
CA (1) CA1337823C (fr)
GB (2) GB8724010D0 (fr)
WO (1) WO1989003491A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992012365A1 (fr) * 1990-12-31 1992-07-23 Specialist Sealing Limited Joint d'etancheite
EP0472324A3 (en) * 1990-08-06 1993-03-03 Specialist Sealing Limited Static seal
US5558347A (en) * 1990-12-31 1996-09-24 Specialist Sealing Limited Seal

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0910536D0 (en) * 2009-06-18 2009-07-29 Rolls Royce Plc A compliant element

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2135785A1 (de) * 1970-07-17 1972-01-27 Corrugated Packing Sheet Metal Dichtungsring
DE2618804A1 (de) * 1976-04-29 1977-11-03 Kempchen & Co Gmbh Ganzmetalldichtung
DE3149753A1 (de) * 1981-12-16 1983-06-23 Kempchen & Co Gmbh, 4200 Oberhausen Dichtungsring fuer flanschdichtungen
GB2185295A (en) * 1986-01-15 1987-07-15 Chemical Reactor Services Ltd Joint sealing gasket

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2135785A1 (de) * 1970-07-17 1972-01-27 Corrugated Packing Sheet Metal Dichtungsring
DE2618804A1 (de) * 1976-04-29 1977-11-03 Kempchen & Co Gmbh Ganzmetalldichtung
DE3149753A1 (de) * 1981-12-16 1983-06-23 Kempchen & Co Gmbh, 4200 Oberhausen Dichtungsring fuer flanschdichtungen
GB2185295A (en) * 1986-01-15 1987-07-15 Chemical Reactor Services Ltd Joint sealing gasket

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0472324A3 (en) * 1990-08-06 1993-03-03 Specialist Sealing Limited Static seal
WO1992012365A1 (fr) * 1990-12-31 1992-07-23 Specialist Sealing Limited Joint d'etancheite
GB2251274B (en) * 1990-12-31 1994-10-12 Specialist Sealing Ltd Seal
US5558347A (en) * 1990-12-31 1996-09-24 Specialist Sealing Limited Seal

Also Published As

Publication number Publication date
CA1337823C (fr) 1995-12-26
GB2210939A (en) 1989-06-21
GB2210939B (en) 1991-05-01
GB8823989D0 (en) 1988-11-23
GB8724010D0 (en) 1987-11-18

Similar Documents

Publication Publication Date Title
US4189819A (en) Method of manufacturing metallic spirally wound gaskets
US3204666A (en) Helically wound flexible hose
US4185858A (en) Secondary seal for tubing joined via V-band couplings
US5411274A (en) Vortex gasket for automative exhaust system
GB2075616A (en) Annular gasket
US1942703A (en) Gasket
US4019244A (en) Spiral wound gasket assembly method
JPH02266164A (ja) 渦巻ガスケツト及びその製造法
CA1337823C (fr) Bague d'etancheite flexible
US4127277A (en) Spiral wound gasket assembly and method
EP0472324B1 (fr) Garniture d'étanchéité statique
US4640455A (en) Method of making a metal seal for flanged joints and a seal made by said method
US5794946A (en) Spiral wound gasket
EP0122260B1 (fr) Capsule de soufflet pour pression elevee et son procede de fabrication
US2474790A (en) Gasket centering means
US5653450A (en) Ultra-flexible gasket with double jacket
JP2006515049A (ja) 非常に高い温度で使用するための板状内部構造を備えたシール継手
US2442311A (en) Composite compressible gasket
US6418971B1 (en) Flexible metal conduit
US3556541A (en) Annular packing with metallic reinforcement
JPH0226367A (ja) 圧力変形防止リング付き金属シール部材
US20040091656A1 (en) Helically-wound duct
US2244640A (en) Gasket
JPH05215242A (ja) 静的シール
DE2910802A1 (de) Flexible umhuellung fuer rohre u.dgl.

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR GB IT LU NL SE

122 Ep: pct application non-entry in european phase