EP0272983A1 - Abdichtungseinrichtung einer eine dehnbare Flüssigkeit enthaltenden Umfassung, insbesondere in einem elektrischen Verbindungszusammenbau - Google Patents

Abdichtungseinrichtung einer eine dehnbare Flüssigkeit enthaltenden Umfassung, insbesondere in einem elektrischen Verbindungszusammenbau Download PDF

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Publication number
EP0272983A1
EP0272983A1 EP87402912A EP87402912A EP0272983A1 EP 0272983 A1 EP0272983 A1 EP 0272983A1 EP 87402912 A EP87402912 A EP 87402912A EP 87402912 A EP87402912 A EP 87402912A EP 0272983 A1 EP0272983 A1 EP 0272983A1
Authority
EP
European Patent Office
Prior art keywords
housing
seal
sealing device
length
fluid
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.)
Withdrawn
Application number
EP87402912A
Other languages
English (en)
French (fr)
Inventor
Etienne Ombredane
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.)
General Electric CGR SA
Original Assignee
Thomson CGR
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 Thomson CGR filed Critical Thomson CGR
Publication of EP0272983A1 publication Critical patent/EP0272983A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/26—Lead-in insulators; Lead-through insulators
    • H01B17/30—Sealing
    • H01B17/301—Sealing of insulators to support
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/08—Electrical details
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S277/00—Seal for a joint or juncture
    • Y10S277/91—O-ring seal

Definitions

  • the invention relates to a device for sealing an enclosure containing an expandable fluid, particularly suitable for sealing in a high voltage electrical connection assembly using an electrical insulation fluid.
  • Such electrical connection assemblies are in common use, in particular in radiology where they are used for the high voltage supply of the X-ray tubes.
  • the X-ray tube is generally contained in a protective sheath brought to the ground potential, and in which the X-ray tube is connected to electrical connection means, integral with the sheath, and which terminate outside the latter.
  • connection means integral with the sheath generally constitute receptacles formed by a female part, in the bottom of which is arranged at least one electrical contact pad connected to the X-ray tube.
  • the high voltage produced by a high voltage generator is led to the receptacle by means of a cable with high electrical insulation, the end of which to be connected to the receptacle comprises a ferrule.
  • the end piece constitutes a male part having a diameter less than the inside diameter of the receptacle, and comprises at its end at least one second contact pad brought to the potential of the high voltage.
  • the tip is engaged in the receptacle so as to ensure electrical contact between the contact pads.
  • the male and female parts, or end pieces and receptacles are made of electrically insulating materials, and each have the required qualities of electrical insulation. But, along walls facing the end piece and the receptacle, the interface space between these walls may be the seat of breakdowns, if this interface space does not have sufficient dielectric strength. Also, it is known to perfect electrical insulation, to fill the interface space with an insulation fluid, oil or grease, avoiding incorporating air into it.
  • the interface space is closed by a seal, generally having an O-ring shape so as to be arranged around the male part, and to be clamped between the latter and the female part.
  • the sheath containing the X-ray tube is brought to occupy different positions and inclinations in which the seal prevents the insulating fluid from flowing outside the enclosure.
  • leakage of insulation fluid occurs when the X-ray tube has been subjected to intensive operation and that it generates a rise in temperature of the sheath, and consequently a rise in temperature of the assembly of electrical connection.
  • the present invention relates to a sealing device arranged in a new way, applicable to all assemblies containing an expandable fluid, in particular in an electrical connection assembly for high voltage, which makes it possible to ensure sealing against the expandable fluid. in a wide range of temperatures, and which also allows to provide a safety function as mentioned above, when the fluid is excessively expanded.
  • a sealing device of an enclosure comprising at least one ring-shaped seal, the enclosure being constituted by the assembly of at least two parts between which an interior volume contains a expandable fluid, the seal being contained in a housing disposed between the two parts and around an axis of symmetry, the housing communicating with the interior volume, the seal being clamped between two opposite walls of the housing, is characterized in that the housing has a length along its section in which the seal is movable and can occupy n positions, the length of the housing being constituted by an initial tightening space and by a clearance space, the initial tightening space corresponding to an initial position of the seal , and the clearance space being located on one side of the seal opposite the interior volume, so that the seal enters the clearance space under the thrust of the expanded fluid.
  • Figure 1 shows by way of nonlimiting example, a sealing device according to the invention, used in a set of high voltage electrical connection 1, of the type intended to be mounted on a sheath 2 in which is conventionally contained an X-ray tube (not shown).
  • connection assembly 1 comprises a nozzle 3 or male part, engaged in a receptacle 4 or female part before the general shape of a tank 12.
  • the sheath 2 comprises an orifice 5 of circular section, formed by a tube 6 having a axis of symmetry 7.
  • the receptacle 4 is immersed by its closed end 8 in the orifice 5 along the axis of symmetry 7.
  • the receptacle 4 has at its second end 9, a fixing flange 10 whose outer diameter D1 is greater than the second outer diameter D2 of the tank 12 of the receptacle 4.
  • the receptacle 4 is pressed into the tube 6 so that the flange of fixing 10 is supported on a stop 11 disposed inside the tube 6.
  • the fixing flange 10 has an upper face 14, opposite the stop 11, from which a recess has been made intended to form a housing 16 in the form of a crown substantially centered around the axis of symmetry 7; the housing 16 being formed in the thickness E of the fixing flange 10.
  • the housing 16 has a first end 18 near the interior of the tank 12, and extends with a length L1 towards a peripheral part 24 of the flange fixing 10, to its second end 23 where it is closed by the peripheral part 24.
  • the housing 16 has a third outside diameter D3 smaller than the first outside diameter D1 of the fixing flange 10, so that the latter has all its thickness E in its peripheral part 24 and a reduced thickness (not marked in the figure) in its part where the housing 16 is made up, that is to say between the bottom 19 of the housing 16 and the stop 11.
  • the upper face 14 of the fixing flange 10 thus constitutes, on the peripheral part 24, a bearing face 15 which is used for fixing the receptacle 4.
  • the receptacle 4 is fixed in the orifice 5 using a ring 13 which is screwed into an internal thread 31 of the tube 6 until it is tightened on the bearing face 15 of the collar 10.
  • the receptacle 4 and the end piece 3 respectively comprise a first and a second electrical contact pads 20, 21 which are brought into contact when the end piece 3 is fully engaged in the receptacle 4; the first pad 20 is connected in a conventional manner (not shown) to the device to be supplied, and the second pad 21 is also conventionally connected, via an electrical cable 22, to a high voltage generator (not shown) .
  • One end 26 of the end piece 3, not engaged in the receptacle 4, comprises a second fixing flange 27 having a fourth outside diameter D4 substantially equal to or greater than the third outside diameter D3 of the housing 16.
  • the body 28 of the end piece 3 is engaged in the receptacle 4 so that a lower face 29 of the second flange 27 is applied above the housing 16, and compresses a seal 30 in the form of a ring contained in the housing 16; the lower face 29 possibly also bearing on the bearing face 15.
  • the end piece 3 is assembled to the receptacle 4 using a second ring 35 which is screwed into the internal thread 31 of the tube 6, so as to tighten the second flange 27 against the seal 30 and to compress the latter.
  • the internal surface 17 of the tank 12 of the receptacle 4 and the external surface 41 of the body 28 of the end piece 3 are opposite but are not contiguous, and these surfaces 17, 41 define between them an internal volume 42 which contains an insulation fluid 48.
  • the interior volume 42 communicates with the housing 16 which is formed between a first wall formed by the bottom 19 of the latter, and a second wall formed by the underside 29 of the second flange 29; the seal 30 is thus clamped between the two opposite walls 19, 29, that is to say between the receptacle 4 and the end piece 3, so as to seal the interior volume 42.
  • the seal 30 and the housing 16 constitute a sealing device according to the invention.
  • the length L1 of the housing 16 is formed by an initial space 44 to which is added a clearance space 45.
  • the initial space 44 corresponds to the space occupied by the seal 30 in an initial position P1 from the latter, for example a position where the seal 30 is clamped between the walls 19, 29 when the end piece 3 is secured to the receptacle 4 and the fluid 48 is not expanded; this first position P1 being materialized in the figure by a line in dotted lines passing through the center 46 of the section S2 of the seal 30.
  • the clearance space 45 constitutes an additional space on one side 47 of the seal 30 opposite the volume, e interior 42, in which the seal 30 can be moved under the pressure of the fluid 48.
  • the seal 30 being clamped between the walls 19, 29 at the first position P1, with for example a whistling charge to prevent leakage of fluid due to these inclinations of the connection assembly 1, the seal 30 can occupy n additional positions P2,..., Pn so as to increase the useful internal volume 48 of depending on the expansion of the fluid 48.
  • the seal 30 conventionally comprises an O-ring shape, and its section, by which it is shown in the figure, has a circular shape, but it should be understood that in the spirit of the Invention, section S2 of seal 30 may be of a different shape.
  • the seal 30 is disposed in the housing 16, around the body 28 of the end piece 3 in a plane substantially normal to the axis of symmetry 7, which axis of symmetry 7 thus also constitutes an axis of symmetry of the joint 30.
  • the seal 30 being in the first position P1, the ring that it constitutes comprises a first average radius R1, and the section of the seal 30 comprises a first radius r1 called in the following description small radius r1 to better differentiate it from the first average radius R1 of the ring.
  • the housing 16 itself constitutes a crown having the same axis of symmetry 7 as the ring formed by the seal 30.
  • the difference between an inner radius ri and an outer radius rE of the crown formed by the housing 16 constitutes the length L1 of the latter in which the seal 30 is movable.
  • the distance d1, d2 between the walls 19,29 is made progressively variable along the length L1, so that a first distance d1 between the walls 19,29 towards the first end 18 of the housing 16, that is to say at the first position P1 , is greater than a second distance d2 between the walls 19, 29 at the second position P2.
  • the seal 30 being made of a flexible and elastic material, such as, for example, rubber of the nitrile butadiene acrylic type, the ring which it constitutes retains a volume V which is substantially constant when it passes from the first average radius R1 initial to a second average radius R2 bigger and vice versa.
  • This conservation of the volume of the ring formed by the seal 30 can be used to define the slope P according to which the distance d1, d2 between the two walls must vary 19,29.
  • the length L1 of the housing 16, in which the joint 30 can move is substantially perpendicular to the axis of symmetry 7, and the difference between the second and the first mean radius is that is to say R1 - R2 corresponds directly to the second length L2 which constitutes the length of the displacement of the seal 30 in the housing 16 between the positions P1, P2.
  • the section S1 of the crown formed by the housing 16 can have the same shape while being arranged differently, for example so that the housing 16 has a length L'1 (represented in FIG. 1 by a line in dotted lines) which forms with the axis of symmetry 7 an angle ⁇ different from 90 °: in which case the second length or length of displacement L2 is equal to:
  • the volume V being constant in the deformations of the joint 30, the second small radius r2 which the section of the joint 30 has at the second position P2 is given by the following relation: where R2 is the second mean radius that comprises the ring formed by the seal 30 at the second position P2.
  • the seal 30 is deformed in these movements, for example when it passes from the first initial position P1 to the second position P2; the deformation of the joint constitutes an advantage which helps it to find the first position P1, initial, when the fluid 48 has regained its initial volume.
  • the seal 30 is pushed into the housing 16 with a force greater than that which is exerted in the housing 16, on the first side of the seal 30 opposite the interior volume 42, by the trapped air. or not in the housing 16.
  • the pressure prevailing in the housing 16 is that of the external pressure, that is to say of the atmospheric pressure, which tends to oppose the depression of the seal 30 in the housing 16.
  • the seal 30 When the seal 30 has been brought to the second position P2 for example, under the thrust of the expanded fluid 48, it retains this position as long as the fluid retains its volume of expansion: when the fluid 48 then decreases in volume and no longer exerts its thrust on the seal 30, the latter is pushed back by atmospheric pressure towards the enclosure 42, in the directions shown by the second arrows 60.
  • This first version of the invention is particularly advantageous in that it allows, by a slight increase in the average radius R1 of the ring forming the seal 30, to obtain an increase in the internal volume 42 very much greater than the increase in volume that the fluid 48 is likely to acquire by its expansion.
  • the insulation fluid 48 contained cold in the internal volume 42 that is to say at room temperature, has a volume of substantially 5 cm3; with a conventional insulation fluid, oil or grease, this volume increases by approximately 0.5 cm3 for an increase in temperature of the order of 100 ° C; - and assuming that at the first position P1, the first distance d1 between the walls 19,29 is of the order of 5 mm, that is to say slightly less than the section of the joint 30, and that the first average radius R1 is of the order of 22 mm, a displacement of the joint 30 over a second length L2 of the order of 2.5 mm frees
  • the housing 16 is formed between the wall 29 or lower face which belongs to the end piece 3 and the wall 19 which belongs to the receptacle 4, and more precisely, the housing 16 is constituted by a groove formed in the upper face 14 of the first flange 10 which belongs to the receptacle 4; but it should be understood that, in the spirit of the invention, the housing 16 can be produced in a different manner, for example by digging the lower face 29 of the second flange 27. It is also possible to produce the housing 16 in an intermediate piece (not shown in Figure 1) of so as to avoid any additional machining of the receptacle 4 and of the end piece 3 which, in the case of standardized electrical connection assemblies 1, constitute standard elements of standardized and fixed dimensions.
  • FIG 2 shows the electrical connection devices 1 in which the sealing device of the invention comprises an intermediate part to form the housing 16; the seal 30 being deformed, when it is moved into the housing 16, in the same manner as in the previous example.
  • the receptacle 4 is supported by the first flange 10 for fixing on the stop 11 of the tube 6m where it is clamped by the first ring 13.
  • a clamping face 61 of the first ring 13, oriented towards the upper face 14 of the first flange 10, has been hollowed out in a second thickness E2 of the ring 13, so as to constitute the housing 16; the first ring 13 constituting the above-mentioned intermediate piece.
  • the housing 16 thus extends along its length L1 from the interior volume 42 to a second peripheral portion 62 of the ring 13 which closes the second end 23 of the housing 16, and from which the ring 13 has its entire thickness. E2.
  • the second face 63 of the ring 13, oriented towards the second flange 27 of the end piece 3, has a groove 64 in which is disposed a second fixed seal 65 or static seal.
  • the end piece 3 is engaged in the receptacle 4 in the same manner as in the previous example, and it is clamped by the second clamping ring 35 so as to compress the static seal 65.
  • the interior volume 42 is sealed on the one hand by the static seal 65 which, in a conventional manner, retains a fixed position; the sealing of the enclosure 42 being produced on the other hand by the movable seal 30, which, as in the previous example, can sink into the housing 16 as a function of the expansion of the insulation fluid 48.
  • the walls of the housing 16 are formed for the first wall by the upper face 14 of the flange 10, and for the second wall by the surface 70 hollowed out in the first clamping ring 13; these two walls 14,70 being separated from each other by a distance d1, d2 which decreases along the length L1, gradually, moving away from the interior volume 42, as in the previous example.
  • the advantage of this version of the invention is that it makes it possible to produce the housing 16 having the same properties as in the previous example, without modifying the receptacle 4 or the end piece 3 thanks to simple machining of the first ring clamp 13.
  • FIG. 3 shows the electrical connection assembly 1, and illustrates a version of the sealing device of the invention in which the length L1 of the housing 16 is substantially parallel to the plane of symmetry 7.
  • the receptacle 4 is fixed in the tube 6 by the first clamping ring 13 which is brought to bear on the first flange 10.
  • the end piece 3 is engaged in the receptacle 4 so that its second flange 27 is in abutment on the first clamping ring 13, against which it is clamped by the second clamping ring 35.
  • the lower volume 42 is defined as in the previous examples between the inner and outer surfaces 41, 17 of the receptacle 4 and the end piece 3, from the bottom 9 of the receptacle 4 to the first end 18 of the housing 16.
  • the housing 16 is located in the extension of the interior volume 42 and its length L1 is disposed parallel to the axis of symmetry 7.
  • the housing 16 is formed between the outer surface 17 of the body 28 of the nozzle 3, and inner wall 66 of the receptacle 4 where the latter has a fifth inner diameter D5 larger than a sixth diameter D6 which it comprises from the interior volume 42. Consequently, the first end 18 of the housing 7 in the form of a stop on which the seal 30 can rest in the first position P1.
  • the seal 30 is disposed in the housing 16 and constitutes around the body 28 of the end piece 3 a ring whose plane is normal to the axis of symmetry 7.
  • the seal 30 in its uncompressed state (not shown) has a diameter slightly greater than the third distance d3 between the walls 66, 17 of the housing 16.
  • the first ring 13 has the same interior (not shown) as the sixth diameter D6, so as to partially close the housing 16 at its second end 23.
  • the enclosure 42 is filled with the insulating fluid.
  • the insulation fluid 48 expands, it pushes the seal 30 in the housing 16 towards the second end 23 of the latter, so that the seal 30 occupies another position P2, Pn all the closer to the second end 23 of the housing 16 that the insulation fluid has greatly expanded.
  • the first side 47 of the seal 30 being in the open air or atmospheric pressure, the seal 30 is pushed back to the first position P1 when the fluid 48 decreases in volume.
  • the seal 30 does not undergo deformation resulting in a modification of the radius of its section S2, so that the walls 66,17 of the housing 16 can be parallel, that is to say at a distance d3 from each other constant. It is nevertheless possible, to promote the return of the seal 30 to the first position P1, to make the walls 66, 17 of the housing 16 not parallel to each other so that the distance from one to the other progressively decreases towards the second end 23 of the housing 16, with a fairly slight slope.
  • the seal 30 does not need to be strongly tightened in the housing 16, since it does not have to withstand very high pressures from the fluid 48 dilated, owing to the fact that it is displaced and that it increases the useful volume of the enclosure 42 as a function of the expansion of the fluid. Also, assuming that the reserve volume that constitutes the housing 16 is insufficient to compensate for the expansion of the fluid, the seal 30 provides only a relatively low resistance to the fluid which can exit outside the connection assembly electric 1, thus avoiding the bursting of the latter.
  • the invention is applicable to enclosures containing an expandable fluid, and it is particularly applicable to high voltage electrical connection assemblies, to ensure sealing against the fluid which serves to perfect the electrical insulation.

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  • Gasket Seals (AREA)
EP87402912A 1986-12-23 1987-12-18 Abdichtungseinrichtung einer eine dehnbare Flüssigkeit enthaltenden Umfassung, insbesondere in einem elektrischen Verbindungszusammenbau Withdrawn EP0272983A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8618086 1986-12-23
FR8618086A FR2608887B1 (fr) 1986-12-23 1986-12-23 Dispositif d'etancheite d'une enceinte contenant un fluide dilatable notamment dans un ensemble de connexion electrique

Publications (1)

Publication Number Publication Date
EP0272983A1 true EP0272983A1 (de) 1988-06-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP87402912A Withdrawn EP0272983A1 (de) 1986-12-23 1987-12-18 Abdichtungseinrichtung einer eine dehnbare Flüssigkeit enthaltenden Umfassung, insbesondere in einem elektrischen Verbindungszusammenbau

Country Status (3)

Country Link
US (1) US4903972A (de)
EP (1) EP0272983A1 (de)
FR (1) FR2608887B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU609814B2 (en) * 1987-12-11 1991-05-09 Rte Corporation Bushing and gasket assembly
EP0520527A1 (de) * 1991-05-27 1992-12-30 Claymount Assemblies B.V. Hochspannungsverbinderanordnung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2769756B1 (fr) * 1997-10-09 1999-12-31 Ge Medical Syst Sa Bague-soufflet pour connecteur haute-tension et connecteur haute-tension obtenu
SE0301506D0 (sv) * 2003-05-22 2003-05-22 St Jude Medical Method in connection with an implantable medical device
DE102015103274A1 (de) 2015-03-06 2016-09-08 HARTING Electronics GmbH Kabelabdichtung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1377420A (fr) * 1963-09-16 1964-11-06 Int Standard Electric Corp Boîtier pour appareil électrique

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2118613A (en) * 1935-02-27 1938-05-24 Asea Ab Vacuum-tight joint for electrode lead-ins
US2708573A (en) * 1952-07-10 1955-05-17 Wales Strippit Corp Seal for liquid springs
US3071386A (en) * 1960-03-14 1963-01-01 Greene Tweed & Co Inc Fluid pressure seals
US3698728A (en) * 1971-01-07 1972-10-17 Mc Donnell Douglas Corp Fluid sealing device
US4072154A (en) * 1976-05-28 1978-02-07 Cardiac Pacemakers, Inc. Sealing arrangement for heart pacer electrode leads
US4203607A (en) * 1976-12-01 1980-05-20 Brieger Emmet F High pressure, fluid tight seal
US4577870A (en) * 1984-02-13 1986-03-25 American Standard Inc. O-ring seal in channel with fluid pressure equalization means

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1377420A (fr) * 1963-09-16 1964-11-06 Int Standard Electric Corp Boîtier pour appareil électrique

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU609814B2 (en) * 1987-12-11 1991-05-09 Rte Corporation Bushing and gasket assembly
EP0520527A1 (de) * 1991-05-27 1992-12-30 Claymount Assemblies B.V. Hochspannungsverbinderanordnung
US5232376A (en) * 1991-05-27 1993-08-03 Claymount Assemblies B.V. High-voltage connector assembly

Also Published As

Publication number Publication date
FR2608887A1 (fr) 1988-06-24
FR2608887B1 (fr) 1989-03-17
US4903972A (en) 1990-02-27

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