Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
  • H01R13/46—Bases; Cases
  • H01R13/533—Bases, cases made for use in extreme conditions, e.g. high temperature, radiation, vibration, corrosive environment, pressure
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
  • H01R13/73—Means for mounting coupling parts to apparatus or structures, e.g. to a wall
  • H01R13/74—Means for mounting coupling parts in openings of a panel
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
  • H01R13/46—Bases; Cases
  • H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
  • H01R13/521—Sealing between contact members and housing, e.g. sealing insert

Definitions

• the present invention relates to electrical feedthroughs operating under critical conditions as well as providing electrical feedthroughs and vacuum- tight conditions by metal leads fitted with interference into one or more adjacent, coaxial discs of plastic material with high electrical, mechanical, thermal, chemical resistance in order to guarantee the quality of the required performance, to improve the mean life with respect to the current devices and above all to reduce the production cost.
• the invention also relates to the methods of providing such electrical feedthroughs. Multiple electrical feedthroughs for ultravacuum application at operating temperatures of 70 to 530°K are known in the art. These devices provide the electrical feedthroughs by metal leads and ensure the vacuum tightness, the electrical, thermal insulation by using and sealing ' glass, quartz or ceramic materials according to the operating conditions.
• the sealing of metal leads, insulating materials, and outer supporting metal ring is carried out by using a number of technologies, all of them being specialized.
• the manufacturers of electrical feedthroughs guarantee the required performance by using ceramics as insulation materials of the device and the refined, expensive metal-ceramics-metal brazing technique as sealing means .
• Such solutions require the use of sophisticated technologies, expensive materials, complex setting b steps, high-technology equipment and highly specialized labour.
• the insulating materials such as glass, quartz and ceramics perfectly meet the requirements both of manufacturers and users of electrical
• electrical feedthroughs including one or more solid metal leads with a cylindrical section fitted into holes formed in one or jC more plastic discs adjacent and coaxial to one another allowing the electrical current to pass and the vacuum degree required by the specification to be provided because of their mechanical, thermal, chemical, electrical characteristics as well as their special coupling to the leads and outer supporting rings.
• the tightness between solid metal lead and plastic disc is provided by a suitable interference between both such parts so as to provide the requested vacuum degree even under varying operating temperatures.
• the above-mentioned coupling has a certain amount of interference between both parts such as to ensure always the vacuum tightness without causing a permanent deformation of the plastic disc.
• a permanent deformation of the hole of the plastic disc would not allow the thermal dilatations of the materials involved to be taken up in the whole operating range.
• the interference mentioned above is provided by different methods and building solutions which are used in relation to the thermal fields or the extreme operating temperatures required.
• the cost of the electrical feedthroughs increases according to the heaviness of the operation.
• the first solution provides that the electrical feedthroughs consist of a plastic insulator made by two adjacent, coaxial discs, in which one or more cylindrical metal leads having a very short length with larger diameter are fitted.
• the two segments of the metal leads with lower diameter are fitted into holes arranged geometrically in the two discs forming the insulating support, while the length of the metal leads with larger diameter is placed between the two discs of the insulator accordingly.
• the choice of suitable tolerances between the meal leads and the plastic support allows a forced coupling to be provided able to guarantee the vacuum degree required by the specifications.
• the electrical feedthroughs consist of one or more cylindrical metal leads having a short length with larger diameter which is fitted into a hole of the disc of plastic material and guarantees the vacuum tightness.
• the third solution provides electrical feedthroughs consisting of one or more cylindrical metal leads with uniform diameter which are fitted into holes with larger diameter arranged geometrically and formed in plastic discs adjacent and coaxial to one another.
• the vacuum tightness is provided by a little perforated cylinder or sleeve which is coaxial to the metal leads and arranged between the two plastic discs.
• the choice of suitable coupling tolerances between metal leads, perforated little cylinders, and plastic discs, and the pressing of the two discs to each other until their two opposite surfaces are brought into contact provides a forced coupling between the two discs and the metal lead.
• the perforated little cylinder consists of a type of plastics that makes coupling and keeping the vacuum degree easier.
• the assembly of insulator and electrical leads described above in three different embodiments is pressed between two adjacent, coaxial metal rings rigidly sealed to each other.
• the metal ring with larger opening has a circular saw tooth projection at its inner flat wall, that enters the plastic material by the pressure exerted on the insulator before sealing both such metal rings, thus ensuring the vacuum tightness.
• the metal ring with its projection is sealed to the wall so that the rooms are separated.
• the two metal rings containing the insulator are connected to two bushes by sealing. Both bushes can be threaded at their cylindrical outer and/or inner surface to allow electrical connectors to be used.
• the insulator is made by using special plastic or thermoplastic materials able to guarantee high electrical, mechanical, thermal, chemical resistance under all operating conditions, as mentioned in the specifications.
• the assembly of insulator and electrical leads can be incorporated by moulding and casting such metal leads into a suitable thickness of an insulator of plastic or thermoplastic material.
• the vacuum and pressure tightness between metal leads and insulator can be obtained according to the invention by putting the opposite ends of the metal leads suitably provided with diametrical pads into corresponding holes of two insulating discs which are then pressed to one another.
• the tightness is also ensured by that a coaxial seat shaped like the pads of such metal leads is formed around each hole of the discs.
• Fig. 1 shows a section of the electrical feedthroughs where all components according to a first embodiment of the insulator are illustrated
• Fig . 2 shows a section of the electrical feedthroughs where all components according to a second embodiment of the insulator ' are illustrated;
• Fig. 3 shows a section of the electrical feedthroughs where all components according to a third embodiment of the insulator are illustrated
• Fig. 4 is a section of the particular indicated at 2 in Figs. 1, 2 and 3;
• Fig. 5 is a section of the particular indicated at 3 in Figs. 1, 2 and 3;
• Figs . 6 and ⁇ a show a section and a view of the particular 5, 5' in Figs. 1, 2 and 3, respectively;
• Figs. 7 and 7a show a section and a view of the particular 5a in Figs. 1, 2 and 3, respectively;
• Fig. 8 shows a section of particular 7 of Fig. 3;
• Figs. 9 and 10 show the two steps of the forced insertion with interference according to a preferred method of the invention.
• Figs. 11 and 12 show the two steps of providing the assembly of insulator and metal leads by casting or pressure die-casting
• Figs . 13 and 13a show a top plan view and a section of the assembling step of the two insulating discs pressed to the metal leads provided with diametrical pads, respectively, and
• Fig. 14 shows the assembly of insulator and leads as made.
• the invention consists of a plastic insulator made by two adjacent, coaxial discs 5, 5' in which one or more cylindrical metal leads 6 are fitted, such leads having a very short length with larger diamete .
• the two segments of the metal leads with lower diameter are fitted into holes geometrically arranged in both discs 5, 5' forming the insulating support, while the length of the metal leads with larger diameter is located between the two discs of the insulator accordingly.
• the choice of suitable tolerances between metal leads 6 and plastic supports 5, 5' allows a forced coupling to be provided able to guarantee the vacuum degree required by the specifications.
• the assembly of insulator and electrical leads 5, 6, 5' is pressed between two adjacent, coaxial metal rings 2, 3 connected by sealing to each other.
• the metal ring with larger opening 2 has a circular saw tooth projection at its inner flat wall, that forms a circular seat in the plastic material by the pressure exerted on the insulator before sealing both metal rings 2, 3, thus ensuring the vacuum tightness.
• Metal ring 2 with its projection is sealed to the wall so that the rooms are separated.
• the side flat surfaces of the two metal rings 2, 3 of the insulator 5, 5' are connected to two bushes 1, 4 by sealing.
• the two bushes 1, 4 can be threaded at their cylindrical outer and/or inner surface to allow electrical connectors to be used.
• a plastic insulator shaped as a cylindrical disc 5a in which one or more cylindrical metal leads 6b are fitted and characterized by a short length with larger diameter suitably provided for a forced coupling to the holes geometrically arranged in disc 5a.
• the choice of suitable tolerances between metal leads 6b and plastic support 5a allows the vacuum degree required by the specifications to be ensured.
• the assembly of insulator 5a and electrical leads 6b is pressed between two adjacent, coaxial metal rings 2, 3 rigidly sealed to each other.
• the metal ring 2 with larger opening has a circular saw tooth projection at its inner flat wall, that forms a circular seat in the plastic material of disc 5a by the pressure exerted on the insulator before sealing both such metal rings 2, 3, thus ensuring the vacuum tightness.
• the metal ring 2 with its projection is sealed to the wall so that the rooms are separated.
• the side flat surfaces of the two metal rings 2, 3 of insulator 5a are connected to two bushes 1, 4 by sealing.
• the two bushes 1, 4 can be threaded at their cylindrical outer and/or inner surface to allow electrical connectors to be used.
• the invention consists of one or more cylindrical metal leads with constant diameter 6a which are fitted into holes with larger diameter arranged geometrically and formed in plastic discs 5, 5' adjacent and coaxial to each another.
• the vacuum tightness is provided by a little perforated cylinder or sleeve which is coaxial to the metal leads and arranged between the two plastic discs 5, 5 1 .
• the choice of suitable coupling tolerances between metal leads 6a, perforated little cylinders 7, and plastic discs 5, 5', and the pressing of the two discs 5, 5' to each other until they are brought into contact provides a forced coupling between the two discs 5, 5' and metal lead 6a.
• the assembly of insulator 5, 5' and electrical leads 6a is pressed between two adjacent, coaxial metal rings 2, 3 rigidly sealed to each other.
• the metal ring 2 with larger opening has a circular saw tooth projection at its inner flat wall, that forms a circular seat in the plastic material of disc 5 by the pressure exerted on the insulator before sealing both such metal rings 2, 3, thus ensuring the vacuum tightness.
• the metal ring 2 with its projection is sealed to the wall so that the rooms are separated.
• the side flat surfaces of the two metal rings 2, 3 of insulator 5, 5' are connected to two bushes 1, 4 by sealing during the assembling step of the electrical feedthroughs.
• the two bushes 1, 4 can be threaded at their cylindrical outer and/or inner surface to allow electrical connectors to be used.
• Figure 4 shows a section and a view of the particular 2 of Figures 1, 2 and 3: such component is made of metal and has a hollow cylindrical shape with circular steps sloping down to the axis.
• such component is provided with a circular saw tooth projection at one flat inner wall.
• Figure 5 shows a section and a view of particular 3 of Figures 1, 2 and 3: such component is made of metal and has a hollow cylindrical shape with circular steps sloping down to the axis both at the outside and the inside of the cylinder. This particular geometrical shape is needed to receive and press uniformly the plastic insulator together with particular 2.
• Figures 6 and 6a show a section and a front view of particular 5, 5' of Figures 1 and 3, respectively: 5 such component is of plastic or thermoplastic material with any fibre reinforcement and has a cylindrical shape with a diameter-to-height ratio varying from 8 to 10.
• the disc is provided with one or more through holes parallel to the axis. The diameter of the holes
• Figure 7 and 7a show a section and a view of particular 5a of Figure 2: such component is of plastic or thermoplastic material provided with any fibre reinforcement and having a cylindrical shape with a diameter-to-height ratio of the cylinder
• the disc is provided with one or more through holes parallel to the axis.
• the diameter of the holes of the disc is such as to provide a free displacement coupling with the leads 6b along all of their length except for the short length with larger
• Figure 8 shows a section of particular 7 of Fig. 3: such component is of plastic material and has a complex shape formed of a cylinder on which a
• the solid described above has a through cavity, the inner diameter of which is such as to provide a transition push fit with metal leads 6a.
• Figures 9 and 10 show the steps of pressure fitting with interference according to the first method of the invention.
• a plurality of metal leads 6 the diameter of which is such as to provide an interference able to guarantee the vacuum and pressure tightness are fitted into such holes.
• a auxiliary receiving equipment 9 can be used so that metal leads 6 can be kept in the desired arrangement.
• Fig. 11 shows schematically the embodying of metal leads 6 inside the thickness of an insulator 5 by moulding or casting of plastic or thermoplastic material by the aid of a mould 10. The result is shown in Fig. 12.

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• Connections Arranged To Contact A Plurality Of Conductors (AREA)
• Connector Housings Or Holding Contact Members (AREA)

Applications Claiming Priority (1)

Publications (1)

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ID=34259983

Family Applications (1)

Country Status (3)

Cited By (1)

Citations (2)

Family Cites Families (2)

• 2003
  • 2003-08-27 WO PCT/IT2003/000519 patent/WO2005022694A1/en active Application Filing
  • 2003-08-27 EP EP03818409A patent/EP1658657A1/de not_active Withdrawn
  • 2003-08-27 AU AU2003265145A patent/AU2003265145A1/en not_active Abandoned

Patent Citations (2)

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