WO2020044145A1 - Sealing assembly and oil-filled cable terminal - Google Patents

Sealing assembly and oil-filled cable terminal Download PDF

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Publication number
WO2020044145A1
WO2020044145A1 PCT/IB2019/056695 IB2019056695W WO2020044145A1 WO 2020044145 A1 WO2020044145 A1 WO 2020044145A1 IB 2019056695 W IB2019056695 W IB 2019056695W WO 2020044145 A1 WO2020044145 A1 WO 2020044145A1
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WO
WIPO (PCT)
Prior art keywords
oil
cable terminal
filled cable
strip
filled
Prior art date
Application number
PCT/IB2019/056695
Other languages
French (fr)
Inventor
Zheng Huang
Ming Zhang
Jinquan YANG
Original Assignee
3M Innovative Properties Company
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 3M Innovative Properties Company filed Critical 3M Innovative Properties Company
Publication of WO2020044145A1 publication Critical patent/WO2020044145A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/20—Cable fittings for cables filled with or surrounded by gas or oil
    • H02G15/22—Cable terminations
    • H02G15/23—Cable-end sealings

Definitions

  • the present invention relates to a sealing assembly of an oil-filled cable terminal and an oil-filled cable terminal comprising the sealing assembly.
  • High-voltage oil-filled power cable terminal products are currently a main form of high- voltage power cable terminal product.
  • almost all of outdoor cable terminals in ultra-high voltage cable terminal product systems are oil-filled cable terminal products.
  • the present invention aims at solving at least one aspect of the above-described problems and deficiencies existing in the prior art.
  • a sealing assembly of an oil-filled cable terminal comprising: a metal tube; a first elastic sealing member, molded on an outer peripheral surface of the metal tube, and used for axially sealing the oil-filled cable terminal; and a second elastic sealing member, molded on an end portion of the metal tube, and used for radially sealing the oil-filled cable terminal.
  • the first elastic sealing member is adapted to be axially pressed against a bottom plate used for mounting the oil-filled cable terminal, so as to achieve axial sealing between the oil-filled cable terminal and the bottom plate.
  • the second elastic sealing member and a cable extending into the oil-filled cable terminal form an interference fit, so as to achieve radial sealing between the oil-filled cable terminal and the cable.
  • the first elastic sealing member comprises a base portion, an edge portion, and a connecting portion connecting the base portion to the edge portion; the base portion is directly attached to the outer peripheral surface of the metal tube, the edge portion protrudes axially towards two sides relative to the connecting portion, and the edge portion is adapted to be axially pressed against the bottom plate so as to achieve the axial sealing.
  • the edge portion protrudes axially towards each of the two sides by 1-5 mm relative to the connecting portion.
  • the edge portion protrudes axially towards each of the two sides by 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm relative to the connecting portion.
  • a cross section of the edge portion of the first elastic sealing member is substantially circular; a cross section of the base portion of the first elastic sealing member is substantially trapezoidal, and gradually contracts outwards radially; and a cross section of the connecting portion of the first elastic sealing member is substantially rectangular.
  • the second elastic sealing member has a through hole allowing a treated end portion of the cable to pass through, and an inner diameter of the through hole is less than an outer diameter of the end portion of the cable, such that the end portion of the cable and the through hole form an interference fit, so as to achieve the radial sealing.
  • the inner diameter of the through hole of the second elastic sealing member is 90%-96% of the outer diameter of the end portion of the cable.
  • an inner diameter of the metal tube is greater than the outer diameter of the end portion of the cable; and a gap between an inner surface of the metal tube and an outer surface of the end portion of the cable is within a range of 5-10 mm.
  • an axis of the metal tube coincides with an axis of the through hole of the second elastic sealing member, so as to ensure that the end portion of the cable passing through the metal tube and the through hole is centrally positioned in the metal tube.
  • the first elastic sealing member and the second elastic sealing member are made of the same oil-resistant elastic material or from different oil-resistant elastic materials.
  • the metal tube is made of a non-magnetic conductive metal material.
  • the metal tube is made of copper or aluminum.
  • an oil-filled cable terminal comprising the above-described sealing assembly.
  • the oil-filled cable terminal further comprises a support plate and a tail tube, wherein the support plate and the tail tube are sleeved on the cable, and are adapted to be fixed on one side of a bottom plate used for mounting the oil-filled cable terminal; when the support plate and the tail tube are fixed on the bottom plate, the support plate compresses a first elastic sealing member of the sealing assembly in a groove of the bottom plate, so as to achieve axial sealing between the oil-filled cable terminal and the bottom plate.
  • the oil-filled cable terminal further comprises an insulator, wherein the insulator is sleeved on the cable, and is adapted to be fixed on the other side of the bottom plate, and an O-shaped seal ring is adopted for sealing between the insulator and the bottom plate.
  • the oil-filled cable terminal further comprises a first semiconductive strip, a first metal shield strip, and a first insulation strip, wherein the first semiconductive strip is wound around a metal tube of the sealing assembly and a metal sheath of the cable, the first metal shield strip is wound around the first semiconductive strip, and the first insulation strip is wound around the first metal shield strip.
  • the oil-filled cable terminal further comprises a second semiconductive strip, a second metal shield strip, and a second insulation strip, wherein the second semiconductive strip is wound around the metal tube and a second elastic sealing member of the sealing assembly and an outer semiconductive layer of the cable, the second metal shield strip is wound around the second semiconductive strip, and the second insulation strip is wound around the second metal shield strip.
  • the oil-filled cable terminal further comprises a first heat shrinkable tube and a second heat shrinkable tube, wherein the first heat shrinkable tube is heat-shrunk on the tail tube and the cable, and the second heat shrinkable tube is heat-shrunk on the second insulation strip.
  • the oil-filled cable terminal further comprises a waterproof sealing strip, wherein the waterproof sealing strip is wound around the first insulation strip.
  • the oil-filled cable terminal further comprises a copper braid located between the metal sheath and the first metal shield strip, wherein one end of the copper braid and the first metal shield strip is fastened in a first annular slot of the metal tube of the sealing assembly by a copper wire, and the other end is fastened on the metal sheath of the cable by a copper wire; after being fastened, the one end and the other end of the copper braid and the first metal shield strip are respectively soldered to the metal tube and the metal sheath.
  • the other end of the second metal shield strip is fastened in a second annular slot of the metal tube of the sealing assembly by a copper wire; after being fastened, the other end of the second metal shield strip is soldered to the metal tube.
  • the oil-filled cable terminal further comprises a copper braid located between the metal sheath and the first metal shield strip, one end of the copper braid is soldered to the metal tube of the sealing assembly, and the other end is soldered to the metal sheath of the cable.
  • the bottom plate and the tail tube are adapted to be connected to a ground terminal, and are used for grounding the oil-filled cable terminal.
  • the first elastic sealing member and the second elastic sealing member of the sealing assembly can respectively achieve the axial sealing and the radial sealing of the oil-filled cable terminal, thereby improving sealing performance of the oil-filled cable terminal.
  • the metal tube of the sealing assembly can improve easiness and reliability of grounding, thereby improving reliability of grounding of a cable.
  • FIG. 1 shows a schematic diagram of a sealing assembly according to an embodiment of the present invention.
  • FIG. 2 shows a schematic diagram of an oil-filled cable terminal according to an embodiment of the present invention.
  • a sealing assembly of an oil-filled cable terminal comprises: a metal tube; a first elastic sealing member, molded on an outer peripheral surface of the metal tube, and used for axially sealing the oil-filled cable terminal; and a second elastic sealing member, molded on an end portion of the metal tube, and used for radially sealing the oil-filled cable terminal.
  • FIG. 1 shows a schematic diagram of a sealing assembly 101 according to an
  • FIG. 2 shows a schematic diagram of an oil-filled cable terminal 10 according to an embodiment of the present invention.
  • the sealing assembly of the oil-filled cable terminal mainly comprises: a metal tube 1012, a first elastic sealing member 1011, and a second elastic sealing member 1013.
  • the metal tube 1012 can be made of a non magnetic conductive metal material.
  • the metal tube 1012 can be made of copper or aluminum.
  • the first elastic sealing member 1011 is molded on an outer peripheral surface of the metal tube 1012, and is used for axially sealing the oil-filled cable terminal 10.
  • the second elastic sealing member 1013 is molded on an end portion of the metal tube 1012, and is used for radially sealing the oil-filled cable terminal 10.
  • the entire sealing assembly 101 is an integral sealing assembly, thereby greatly facilitating mounting and use.
  • the first elastic sealing member 1011 can be made of an elastic material having high oil resistance, such as an elastic rubber material.
  • the second elastic sealing member 1013 can be made of an elastic material having high oil resistance, such as an elastic rubber material.
  • the first elastic sealing member 1011 and the second elastic sealing member 1013 can be made of the same oil-resistant elastic material, or can be made of different oil-resistant elastic materials.
  • the first elastic sealing member 1011 is adapted to be axially pressed against a bottom plate 110 used for mounting the oil-filled cable terminal 10, so as to achieve axial sealing between the oil-filled cable terminal 10 and the bottom plate 110.
  • the second elastic sealing member 1013 and the cable 113 extending into the oil-filled cable terminal 10 form an interference fit, so as to achieve radial sealing between the oil-filled cable terminal 10 and the cable 113.
  • the first elastic sealing member 1011 comprises a base portion 101 la, an edge portion 101 lb, and a connecting portion 101 lc connecting the base portion 101 la to the edge portion 1011b.
  • the base portion 101 la of the first elastic sealing member 1011 is directly attached to the outer peripheral surface of the metal tube 1012.
  • the edge portion 101 lb of the first elastic sealing member 1011 protrudes axially towards two sides relative to the connecting portion 1011c.
  • the edge portion 1011b of the first elastic sealing member 1011 is adapted to be axially pressed against the bottom plate 110, so as to achieve the axial sealing between the oil-filled cable terminal 10 and the bottom plate 110.
  • the edge portion 101 lb of the first elastic sealing member 1011 can protrude axially towards each of the two sides by 1-5 mm relative to the connecting portion 101 lc.
  • the edge portion 101 lb of the first elastic sealing member 1011 can protrude axially towards each of the two sides by 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm relative to the connecting portion 101 lc.
  • a cross section of the edge portion 101 lb of the first elastic sealing member 1011 is substantially circular.
  • a cross section of the base portion 101 la of the first elastic sealing member 1011 is substantially trapezoidal, and gradually contracts outwards radially.
  • a cross section of the connecting portion 101 lc of the first elastic sealing member 1011 is substantially rectangular. Therefore, the first elastic sealing member 1011 is butterfly-shaped as a whole, and thus, the first elastic sealing member 1011 can be referred to as a butterfly-shaped sealing member.
  • the second elastic sealing member 1013 has a through hole 1013a allowing a treated end portion 113a of the cable 113 to pass through.
  • An inner diameter of the through hole l013a of the second elastic sealing member 1013 is less than an outer diameter of the end portion 113a of the cable 113, such that the end portion 113a of the cable 113 and the through hole 1013a form an interference fit, so as to achieve the radial sealing between the oil-filled cable terminal 10 and the cable 113.
  • the inner diameter of the through hole l0l3a of the second elastic sealing member 1013 can be 90%-96% of the outer diameter of the end portion 113a of the cable 113. That is, the inner diameter of the through hole l0l3a of the second elastic sealing member 1013 can be 4%-10% less than the outer diameter of the end portion 113a of the cable 113.
  • an inner diameter of the metal tube 1012 is greater than the outer diameter of the end portion 113a of the cable 113.
  • the end portion 113a of the cable 113 passes through the metal tube 1012, and is not in contact with the metal tube 1012.
  • a gap between an inner surface of the metal tube 1012 and an outer surface of the end portion 113a of the cable 113 is within a range of 5-10 mm.
  • an axis of the metal tube 1012 coincides with an axis of the through hole 1013a of the second elastic sealing member 1013, so as to ensure the end portion 113a of the cable 113 passing through the metal tube 1012 and the through hole 1013a is centrally positioned in the metal tube 1012.
  • an oil-filled cable terminal 10 is further disclosed.
  • the oil-filled cable terminal 10 comprises the sealing assembly 101 shown in FIG. 1.
  • the oil-filled cable terminal 10 further comprises a support plate 107 and a tail tube 108.
  • the support plate 107 and the tail tube 108 are sleeved on the cable 113, and are adapted to be fixed on one side of a bottom plate 110 used for mounting the oil-filled cable terminal 10.
  • the support plate 107 and the tail tube 108 when the support plate 107 and the tail tube 108 are fixed on the bottom plate 110, the support plate 107 compresses a first elastic sealing member 1011 of the sealing assembly 101 in a groove of the bottom plate 110, so as to achieve axial sealing between the oil-filled cable terminal 10 and the bottom plate 110.
  • the oil-filled cable terminal 10 further comprises an insulator 114, the insulator 114 is sleeved on the cable 113, and is adapted to be fixed on the other side of the bottom plate 110, and an O-shaped seal ring (not shown) is adopted for sealing between the insulator 114 and the bottom plate 110.
  • the oil-filled cable terminal 10 further comprises a first semi conductive strip 102a, a first metal shield strip l03a, and a first insulation strip l04a.
  • the first semiconductive strip l02a is wound around a metal tube 1012 of the sealing assembly 101 and a metal sheath 111 of the cable 113
  • the first metal shield strip 103a is wound around the first semiconductive strip 102a
  • the first insulation strip 104a is wound around the first metal shield strip l03a.
  • the oil-filled cable terminal 10 further comprises a second semiconductive strip 102b, a second metal shield strip 103b, and a second insulation strip 104b.
  • the second semiconductive strip l02b is wound around the metal tube 1012 and the second elastic sealing member 1013 of the sealing assembly 101 and an outer semiconductive layer of the cable 113a
  • the second metal shield strip 103b is wound around the second semiconductive strip l02b
  • the second insulation strip l04b is wound around the second metal shield strip 103b.
  • the oil-filled cable terminal 10 further comprises a first heat shrinkable tube 109 and a second heat shrinkable tube 106.
  • the first heat shrinkable tube 109 is heat-shrunk on the tail tube 108 and the cable 113
  • the second heat shrinkable tube 106 is heat-shrunk on the second insulation strip 104b.
  • the oil-filled cable terminal 10 further comprises a waterproof sealing strip 105.
  • the waterproof sealing strip 105 is wound around the first insulation strip l04a.
  • the oil-filled cable terminal further comprises a copper braid 112 located between the metal sheath 111 and the first metal shield strip 103 a.
  • One end of the copper braid 112 and the first metal shield strip 103 a is fastened in a first annular slot l0l2a (see FIG. 1) of the metal tube 1012 of the sealing assembly 101 by a copper wire, and the other end is fastened on the metal sheath 111 of the cable 113 by a copper wire.
  • the one end and the other end of the copper braid 112 and the first metal shield strip 103a are respectively soldered to the metal tube 1012 and the metal sheath 111.
  • the present invention is not limited to the above-described embodiments.
  • one end and the other end of the copper braid 112 can be pre-sol dered respectively to the metal tube 1012 of the sealing assembly 101 and the metal sheath 111 of the cable 113. In this way, using copper wires to fasten the two ends of the copper braid 112 is not necessary.
  • the other end of the second metal shield strip 103b is fastened in a second annular slot 1012b (see FIG. 1) of the metal tube 1012 of the sealing assembly 101 by a copper wire. After being fastened, the other end of the second metal shield strip 103b is soldered to the metal tube 1012.
  • 108 are adapted to be connected to a ground terminal, and are used for grounding the oil-filled cable terminal.
  • the above steps not only seal the oil-filled cable terminal, but also reliably ground the entire oil-filled cable terminal, thereby ensuring safe operation of the oil-filled cable terminal.

Abstract

Disclosed is a sealing assembly of an oil-filled cable terminal. The sealing assembly of an oil-filled cable terminal comprises: a metal tube; a first elastic sealing member, molded on an outer peripheral surface of the metal tube, and used for axially sealing the oil-filled cable terminal; and a second elastic sealing member, molded on an end portion of the metal tube, and used for radially sealing the oil-filled cable terminal. In the present invention, the first elastic sealing member and the second elastic sealing member of the sealing assembly can respectively achieve axial sealing and radial sealing of the oil-filled cable terminal, thereby improving sealing performance of the oil-filled cable terminal. In addition, the metal tube of the sealing assembly has good electrical conductivity, thereby improving grounding performance of a cable.

Description

SEALING ASSEMBLY AND OIL-FILLED CABLE TERMINAL
Technical Field
The present invention relates to a sealing assembly of an oil-filled cable terminal and an oil-filled cable terminal comprising the sealing assembly. Background
High-voltage oil-filled power cable terminal products are currently a main form of high- voltage power cable terminal product. In particular, almost all of outdoor cable terminals in ultra-high voltage cable terminal product systems are oil-filled cable terminal products.
However, since the oil-filled cable terminals need to be filled with insulation oil, axial sealing and radial sealing are required at the bottom of the oil-filled cable terminal products. Due to peristalsis of a cable during operation, radially sealing a cable surface is quite difficult, and the oil-filled terminal products are prone to oil leakage. In addition, designing a reliable electrical connection in a sealed section also needs to be taken into consideration. Since a sealing material of the sealed portion is generally a non-metallic elastic material, damage to the cable or malfunction of a cable system may occur due to poor grounding.
Summary
The present invention aims at solving at least one aspect of the above-described problems and deficiencies existing in the prior art.
According to one aspect of the present invention, a sealing assembly of an oil-filled cable terminal is provided, comprising: a metal tube; a first elastic sealing member, molded on an outer peripheral surface of the metal tube, and used for axially sealing the oil-filled cable terminal; and a second elastic sealing member, molded on an end portion of the metal tube, and used for radially sealing the oil-filled cable terminal.
According to an exemplary embodiment of the present invention, the first elastic sealing member is adapted to be axially pressed against a bottom plate used for mounting the oil-filled cable terminal, so as to achieve axial sealing between the oil-filled cable terminal and the bottom plate.
According to another exemplary embodiment of the present invention, the second elastic sealing member and a cable extending into the oil-filled cable terminal form an interference fit, so as to achieve radial sealing between the oil-filled cable terminal and the cable. According to another exemplary embodiment of the present invention, the first elastic sealing member comprises a base portion, an edge portion, and a connecting portion connecting the base portion to the edge portion; the base portion is directly attached to the outer peripheral surface of the metal tube, the edge portion protrudes axially towards two sides relative to the connecting portion, and the edge portion is adapted to be axially pressed against the bottom plate so as to achieve the axial sealing.
According to another exemplary embodiment of the present invention, the edge portion protrudes axially towards each of the two sides by 1-5 mm relative to the connecting portion.
According to another exemplary embodiment of the present invention, the edge portion protrudes axially towards each of the two sides by 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm relative to the connecting portion.
According to another exemplary embodiment of the present invention, a cross section of the edge portion of the first elastic sealing member is substantially circular; a cross section of the base portion of the first elastic sealing member is substantially trapezoidal, and gradually contracts outwards radially; and a cross section of the connecting portion of the first elastic sealing member is substantially rectangular.
According to another exemplary embodiment of the present invention, the second elastic sealing member has a through hole allowing a treated end portion of the cable to pass through, and an inner diameter of the through hole is less than an outer diameter of the end portion of the cable, such that the end portion of the cable and the through hole form an interference fit, so as to achieve the radial sealing.
According to another exemplary embodiment of the present invention, the inner diameter of the through hole of the second elastic sealing member is 90%-96% of the outer diameter of the end portion of the cable.
According to another exemplary embodiment of the present invention, an inner diameter of the metal tube is greater than the outer diameter of the end portion of the cable; and a gap between an inner surface of the metal tube and an outer surface of the end portion of the cable is within a range of 5-10 mm.
According to another exemplary embodiment of the present invention, an axis of the metal tube coincides with an axis of the through hole of the second elastic sealing member, so as to ensure that the end portion of the cable passing through the metal tube and the through hole is centrally positioned in the metal tube. According to another exemplary embodiment of the present invention, the first elastic sealing member and the second elastic sealing member are made of the same oil-resistant elastic material or from different oil-resistant elastic materials.
According to another exemplary embodiment of the present invention, the metal tube is made of a non-magnetic conductive metal material.
According to another exemplary embodiment of the present invention, the metal tube is made of copper or aluminum.
According to one aspect of the present invention, an oil-filled cable terminal is provided, comprising the above-described sealing assembly.
According to an exemplary embodiment of the present invention, the oil-filled cable terminal further comprises a support plate and a tail tube, wherein the support plate and the tail tube are sleeved on the cable, and are adapted to be fixed on one side of a bottom plate used for mounting the oil-filled cable terminal; when the support plate and the tail tube are fixed on the bottom plate, the support plate compresses a first elastic sealing member of the sealing assembly in a groove of the bottom plate, so as to achieve axial sealing between the oil-filled cable terminal and the bottom plate.
According to another exemplary embodiment of the present invention, the oil-filled cable terminal further comprises an insulator, wherein the insulator is sleeved on the cable, and is adapted to be fixed on the other side of the bottom plate, and an O-shaped seal ring is adopted for sealing between the insulator and the bottom plate.
According to another exemplary embodiment of the present invention, the oil-filled cable terminal further comprises a first semiconductive strip, a first metal shield strip, and a first insulation strip, wherein the first semiconductive strip is wound around a metal tube of the sealing assembly and a metal sheath of the cable, the first metal shield strip is wound around the first semiconductive strip, and the first insulation strip is wound around the first metal shield strip.
According to another exemplary embodiment of the present invention, the oil-filled cable terminal further comprises a second semiconductive strip, a second metal shield strip, and a second insulation strip, wherein the second semiconductive strip is wound around the metal tube and a second elastic sealing member of the sealing assembly and an outer semiconductive layer of the cable, the second metal shield strip is wound around the second semiconductive strip, and the second insulation strip is wound around the second metal shield strip.
According to another exemplary embodiment of the present invention, the oil-filled cable terminal further comprises a first heat shrinkable tube and a second heat shrinkable tube, wherein the first heat shrinkable tube is heat-shrunk on the tail tube and the cable, and the second heat shrinkable tube is heat-shrunk on the second insulation strip.
According to another exemplary embodiment of the present invention, the oil-filled cable terminal further comprises a waterproof sealing strip, wherein the waterproof sealing strip is wound around the first insulation strip.
According to another exemplary embodiment of the present invention, the oil-filled cable terminal further comprises a copper braid located between the metal sheath and the first metal shield strip, wherein one end of the copper braid and the first metal shield strip is fastened in a first annular slot of the metal tube of the sealing assembly by a copper wire, and the other end is fastened on the metal sheath of the cable by a copper wire; after being fastened, the one end and the other end of the copper braid and the first metal shield strip are respectively soldered to the metal tube and the metal sheath.
According to another exemplary embodiment of the present invention, the other end of the second metal shield strip is fastened in a second annular slot of the metal tube of the sealing assembly by a copper wire; after being fastened, the other end of the second metal shield strip is soldered to the metal tube.
According to another exemplary embodiment of the present invention, the oil-filled cable terminal further comprises a copper braid located between the metal sheath and the first metal shield strip, one end of the copper braid is soldered to the metal tube of the sealing assembly, and the other end is soldered to the metal sheath of the cable.
According to another exemplary embodiment of the present invention, the bottom plate and the tail tube are adapted to be connected to a ground terminal, and are used for grounding the oil-filled cable terminal.
According to the above-described exemplary embodiments of the present invention, the first elastic sealing member and the second elastic sealing member of the sealing assembly can respectively achieve the axial sealing and the radial sealing of the oil-filled cable terminal, thereby improving sealing performance of the oil-filled cable terminal. In addition, the metal tube of the sealing assembly can improve easiness and reliability of grounding, thereby improving reliability of grounding of a cable.
Other objectives and advantages of the present invention will be apparent from the following description of the present invention with reference to the accompanying drawings, which would also facilitate a thorough understanding of the present invention. Brief Description of the Drawings
FIG. 1 shows a schematic diagram of a sealing assembly according to an embodiment of the present invention; and
FIG. 2 shows a schematic diagram of an oil-filled cable terminal according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be further described in detail below through embodiments and with reference to the accompanying drawings. In the description, the same or similar reference numerals indicate the same or similar parts. The description of the embodiments of the present invention provided below with reference to the drawings is intended to be illustrative of the general inventive concept of the present invention, and is not to be construed as limiting the present invention.
Furthermore, in the following detailed description, in order to provide a clearer explanation and a thorough understanding of the present disclosure, many specific details are provided. However, one or a plurality of embodiments may also be implemented without these specific details. In other cases, well-known structures and apparatus are embodied in drawings to simplify the accompanying drawings.
According to a general technical concept of the present invention, a sealing assembly of an oil-filled cable terminal is provided. The sealing assembly of an oil-filled cable terminal comprises: a metal tube; a first elastic sealing member, molded on an outer peripheral surface of the metal tube, and used for axially sealing the oil-filled cable terminal; and a second elastic sealing member, molded on an end portion of the metal tube, and used for radially sealing the oil-filled cable terminal.
FIG. 1 shows a schematic diagram of a sealing assembly 101 according to an
embodiment of the present invention; FIG. 2 shows a schematic diagram of an oil-filled cable terminal 10 according to an embodiment of the present invention.
As shown in FIGs. 1 and 2, in the illustrated embodiments, the sealing assembly of the oil-filled cable terminal mainly comprises: a metal tube 1012, a first elastic sealing member 1011, and a second elastic sealing member 1013.
In order to achieve good electrical shielding and reliable grounding for a cable 113, in an exemplary embodiment of the present invention, the metal tube 1012 can be made of a non magnetic conductive metal material. For example, the metal tube 1012 can be made of copper or aluminum. As shown in FIGs. 1 and 2, in the illustrated embodiments, the first elastic sealing member 1011 is molded on an outer peripheral surface of the metal tube 1012, and is used for axially sealing the oil-filled cable terminal 10. The second elastic sealing member 1013 is molded on an end portion of the metal tube 1012, and is used for radially sealing the oil-filled cable terminal 10.
In the illustrated embodiments, as shown in FIGs. 1 and 2, since the first elastic sealing member 1011 and the second elastic sealing member 1013 are molded on the metal tube 1012, the entire sealing assembly 101 is an integral sealing assembly, thereby greatly facilitating mounting and use.
As shown in FIGs. 1 and 2, in the illustrated embodiments, the first elastic sealing member 1011 can be made of an elastic material having high oil resistance, such as an elastic rubber material. Similarly, the second elastic sealing member 1013 can be made of an elastic material having high oil resistance, such as an elastic rubber material.
In an exemplary embodiment of the present invention, the first elastic sealing member 1011 and the second elastic sealing member 1013 can be made of the same oil-resistant elastic material, or can be made of different oil-resistant elastic materials.
As shown in FIGs. 1 and 2, in the illustrated embodiments, the first elastic sealing member 1011 is adapted to be axially pressed against a bottom plate 110 used for mounting the oil-filled cable terminal 10, so as to achieve axial sealing between the oil-filled cable terminal 10 and the bottom plate 110.
As shown in FIGs. 1 and 2, in the illustrated embodiments, the second elastic sealing member 1013 and the cable 113 extending into the oil-filled cable terminal 10 form an interference fit, so as to achieve radial sealing between the oil-filled cable terminal 10 and the cable 113.
As shown in FIGs. 1 and 2, in the illustrated embodiments, the first elastic sealing member 1011 comprises a base portion 101 la, an edge portion 101 lb, and a connecting portion 101 lc connecting the base portion 101 la to the edge portion 1011b.
As shown in FIGs. 1 and 2, in the illustrated embodiments, the base portion 101 la of the first elastic sealing member 1011 is directly attached to the outer peripheral surface of the metal tube 1012. The edge portion 101 lb of the first elastic sealing member 1011 protrudes axially towards two sides relative to the connecting portion 1011c. The edge portion 1011b of the first elastic sealing member 1011 is adapted to be axially pressed against the bottom plate 110, so as to achieve the axial sealing between the oil-filled cable terminal 10 and the bottom plate 110. As shown in FIGs. 1 and 2, in an embodiment of the present invention, the edge portion 101 lb of the first elastic sealing member 1011 can protrude axially towards each of the two sides by 1-5 mm relative to the connecting portion 101 lc. For example, the edge portion 101 lb of the first elastic sealing member 1011 can protrude axially towards each of the two sides by 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm relative to the connecting portion 101 lc.
As shown in FIGs. 1 and 2, in the illustrated embodiments, a cross section of the edge portion 101 lb of the first elastic sealing member 1011 is substantially circular. A cross section of the base portion 101 la of the first elastic sealing member 1011 is substantially trapezoidal, and gradually contracts outwards radially. A cross section of the connecting portion 101 lc of the first elastic sealing member 1011 is substantially rectangular. Therefore, the first elastic sealing member 1011 is butterfly-shaped as a whole, and thus, the first elastic sealing member 1011 can be referred to as a butterfly-shaped sealing member.
As shown in FIGs. 1 and 2, in the illustrated embodiments, the second elastic sealing member 1013 has a through hole 1013a allowing a treated end portion 113a of the cable 113 to pass through. An inner diameter of the through hole l013a of the second elastic sealing member 1013 is less than an outer diameter of the end portion 113a of the cable 113, such that the end portion 113a of the cable 113 and the through hole 1013a form an interference fit, so as to achieve the radial sealing between the oil-filled cable terminal 10 and the cable 113.
In an exemplary embodiment of the present invention, the inner diameter of the through hole l0l3a of the second elastic sealing member 1013 can be 90%-96% of the outer diameter of the end portion 113a of the cable 113. That is, the inner diameter of the through hole l0l3a of the second elastic sealing member 1013 can be 4%-10% less than the outer diameter of the end portion 113a of the cable 113.
As shown in FIGs. 1 and 2, in the illustrated embodiments, an inner diameter of the metal tube 1012 is greater than the outer diameter of the end portion 113a of the cable 113. The end portion 113a of the cable 113 passes through the metal tube 1012, and is not in contact with the metal tube 1012. In an embodiment of the present invention, a gap between an inner surface of the metal tube 1012 and an outer surface of the end portion 113a of the cable 113 is within a range of 5-10 mm.
As shown in FIGs. 1 and 2, in the illustrated embodiments, an axis of the metal tube 1012 coincides with an axis of the through hole 1013a of the second elastic sealing member 1013, so as to ensure the end portion 113a of the cable 113 passing through the metal tube 1012 and the through hole 1013a is centrally positioned in the metal tube 1012. As shown in FIG. 2, in another embodiment of the present invention, an oil-filled cable terminal 10 is further disclosed. The oil-filled cable terminal 10 comprises the sealing assembly 101 shown in FIG. 1.
As shown in FIG. 2, in the illustrated embodiment, the oil-filled cable terminal 10 further comprises a support plate 107 and a tail tube 108. The support plate 107 and the tail tube 108 are sleeved on the cable 113, and are adapted to be fixed on one side of a bottom plate 110 used for mounting the oil-filled cable terminal 10.
As shown in FIG. 2, in the illustrated embodiment, when the support plate 107 and the tail tube 108 are fixed on the bottom plate 110, the support plate 107 compresses a first elastic sealing member 1011 of the sealing assembly 101 in a groove of the bottom plate 110, so as to achieve axial sealing between the oil-filled cable terminal 10 and the bottom plate 110.
As shown in FIG. 2, in the illustrated embodiment, the oil-filled cable terminal 10 further comprises an insulator 114, the insulator 114 is sleeved on the cable 113, and is adapted to be fixed on the other side of the bottom plate 110, and an O-shaped seal ring (not shown) is adopted for sealing between the insulator 114 and the bottom plate 110.
As shown in FIG. 2, in the illustrated embodiment, the oil-filled cable terminal 10 further comprises a first semi conductive strip 102a, a first metal shield strip l03a, and a first insulation strip l04a. The first semiconductive strip l02a is wound around a metal tube 1012 of the sealing assembly 101 and a metal sheath 111 of the cable 113, the first metal shield strip 103a is wound around the first semiconductive strip 102a, and the first insulation strip 104a is wound around the first metal shield strip l03a.
As shown in FIG. 2, in the illustrated embodiment, the oil-filled cable terminal 10 further comprises a second semiconductive strip 102b, a second metal shield strip 103b, and a second insulation strip 104b. The second semiconductive strip l02b is wound around the metal tube 1012 and the second elastic sealing member 1013 of the sealing assembly 101 and an outer semiconductive layer of the cable 113a, the second metal shield strip 103b is wound around the second semiconductive strip l02b, and the second insulation strip l04b is wound around the second metal shield strip 103b.
As shown in FIG. 2, in the illustrated embodiment, the oil-filled cable terminal 10 further comprises a first heat shrinkable tube 109 and a second heat shrinkable tube 106. The first heat shrinkable tube 109 is heat-shrunk on the tail tube 108 and the cable 113, and the second heat shrinkable tube 106 is heat-shrunk on the second insulation strip 104b. As shown in FIG. 2, in the illustrated embodiment, the oil-filled cable terminal 10 further comprises a waterproof sealing strip 105. The waterproof sealing strip 105 is wound around the first insulation strip l04a.
As shown in FIG. 2, in the illustrated embodiment, the oil-filled cable terminal further comprises a copper braid 112 located between the metal sheath 111 and the first metal shield strip 103 a. One end of the copper braid 112 and the first metal shield strip 103 a is fastened in a first annular slot l0l2a (see FIG. 1) of the metal tube 1012 of the sealing assembly 101 by a copper wire, and the other end is fastened on the metal sheath 111 of the cable 113 by a copper wire. After being fastened, the one end and the other end of the copper braid 112 and the first metal shield strip 103a are respectively soldered to the metal tube 1012 and the metal sheath 111.
It is to be noted that the present invention is not limited to the above-described embodiments. For example, before the first metal shield strip l03a is wounded, one end and the other end of the copper braid 112 can be pre-sol dered respectively to the metal tube 1012 of the sealing assembly 101 and the metal sheath 111 of the cable 113. In this way, using copper wires to fasten the two ends of the copper braid 112 is not necessary.
As shown in FIG. 2, in the illustrated embodiment, the other end of the second metal shield strip 103b is fastened in a second annular slot 1012b (see FIG. 1) of the metal tube 1012 of the sealing assembly 101 by a copper wire. After being fastened, the other end of the second metal shield strip 103b is soldered to the metal tube 1012.
As shown in FIG. 2, in the illustrated embodiment, the bottom plate 110 and the tail tube
108 are adapted to be connected to a ground terminal, and are used for grounding the oil-filled cable terminal.
A mounting process of the oil-filled cable terminal of the present invention will be described in detail below with reference to FIGs. 1 and 2.
First, sleeve the support plate 107, the tail tube 108, and the heat shrinkable tube 109 on the cable 113.
Then, mount the bottom plate 110 on a mounting support (not shown).
Then, push the integral sealing member 101 to a desired position on the cable 113.
Then, move the integral sealing assembly 101 upwards, such that the first elastic sealing member 1011 thereof is fit closely to the bottom plate 110.
Then, sequentially wind the first semiconductive strip 102a, the first metal shield strip 103a, the first insulation strip 104a, and the waterproof sealing strip 105 on the integral sealing assembly 101 and the metal sheath 111 of the cable, use copper wires to fasten the first metal shield strip 103a and the copper braid 112 of the cable 113 to the metal tube 1012 of the integral sealing assembly 101 and the metal sheath 111 of the cable 113, and perform soldering.
Then, fix the support plate 107 and the tail tube 108 to the bottom plate 110, use the support plate 107 and the tail tube 108 to tightly press the first elastic sealing member 1011 of the integral sealing assembly 101, so as to achieve the axial sealing between the sealing assembly 101 and the bottom plate 110.
Then, heat-shrink the first heat shrinkable tube 109 on the tail tube 108 and the cable 113 to perform sealing protection.
Then, form an interference fit between the second elastic sealing member 1013 at the other end of the integral sealing assembly 101 and the treated end portion 113a of the cable 113, that is, the outer diameter of the end portion 113a of the cable 103 is greater than the inner diameter of the through hole of the second elastic sealing member 1013, so as to achieve the radial sealing between the sealing assembly 101 and the cable 113.
Then, sequentially wind the second semi conductive strip l02b, the second metal shield strip l03b, and the second insulation strip l04b on the second elastic sealing member 1013, and use a copper wire to fasten the second metal shield strip l03b in the slot of the metal tube 1012, and perform soldering.
Then, heat-shrink the second heat shrinkable tube 106 on the second insulation strip l04b to perform sealing protection.
Then, fix the insulator 114 to the bottom plate 110, and use the O-shaped seal ring (not shown) to perform sealing between the insulator 114 and the bottom plate 110.
Finally, connect the ground terminal to the bottom plate 110 or to the tail tube 108, so as to ground the oil-filled cable terminal.
The above steps not only seal the oil-filled cable terminal, but also reliably ground the entire oil-filled cable terminal, thereby ensuring safe operation of the oil-filled cable terminal.
It will be appreciated by those skilled in the art that the embodiments described above are exemplary and that those skilled in the art could improve the embodiments. The structures described in various embodiments can be freely combined provided that a structural conflict or a principle conflict does not exist.
Although the present invention has been illustrated with reference to the drawings, the embodiments disclosed in the drawings are intended to be illustrative of the preferred embodiments of the present invention, and cannot be construed as limiting the present invention.
Although some embodiments of the present general inventive concept have been shown and illustrated, those of ordinary skill in the art will understand that these embodiments can be modified without departing from the principles and spirit of the present general inventive concept, the scope of which is defined by the claims and their equivalents.
It should be noted that the wording“comprise” does not exclude other elements or steps, and the wording“a” or“an” does not exclude plurals. Additionally, any element numbers of the claims should not be construed as limiting the scope of the present invention.

Claims

1. A sealing assembly of an oil-filled cable terminal, comprising:
a metal tube (1012);
a first elastic sealing member (1011), molded on an outer peripheral surface of the metal tube (1012), and used for axially sealing the oil-filled cable terminal (10); and
a second elastic sealing member (1013), molded on an end portion of the metal tube (1012), and used for radially sealing the oil-filled cable terminal (10).
2. The sealing assembly of an oil-filled cable terminal according to claim 1, wherein
the first elastic sealing member (1011) is adapted to be axially pressed against a bottom plate (110) used for mounting the oil-filled cable terminal (10), so as to achieve axial sealing between the oil-filled cable terminal (10) and the bottom plate (110).
3. The sealing assembly of an oil-filled cable terminal according to claim 2, wherein
the second elastic sealing member (1013) and a cable (113) extending into the oil-filled cable terminal (10) form an interference fit, so as to achieve radial sealing between the oil-filled cable terminal (10) and the cable (113).
4. The sealing assembly of an oil-filled cable terminal according to claim 2, wherein
the first elastic sealing member (1011) comprises a base portion (101 la), an edge portion (101 lb), and a connecting portion (101 lc) connecting the base portion (101 la) to the edge portion (101 lb); and
the base portion (101 la) is directly attached to the outer peripheral surface of the metal tube (1012), the edge portion (101 lb) protrudes axially towards two sides relative to the connecting portion (101 lc), and the edge portion (101 lb) is adapted to be axially pressed against the bottom plate (110) so as to achieve the axial sealing.
5. The sealing assembly of an oil-filled cable terminal according to claim 4, wherein
the edge portion (101 lb) protrudes axially towards each of the two sides by 1-5 mm relative to the connecting portion (101 lc).
6. The sealing assembly of an oil-filled cable terminal according to claim 5, wherein
the edge portion (101 lb) protrudes axially towards each of the two sides by 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm relative to the connecting portion (101 lc).
7. The sealing assembly of an oil-filled cable terminal according to claim 4, wherein a cross section of the edge portion (101 lb) of the first elastic sealing member (1011) is substantially circular;
a cross section of the base portion (101 la) of the first elastic sealing member (1011) is substantially trapezoidal, and gradually contracts outwards radially; and
a cross section of the connecting portion (101 lc) of the first elastic sealing member (1011) is substantially rectangular.
8. The sealing assembly of an oil-filled cable terminal according to claim 3, wherein
the second elastic sealing member (1013) has a through hole (l0l3a) allowing a treated end portion (1 l3a) of the cable (113) to pass through, and an inner diameter of the through hole (l0l3a) is less than an outer diameter of the end portion (113a) of the cable (113), such that the end portion (1 l3a) of the cable (113) and the through hole (10l3a) form an interference fit, so as to achieve the radial sealing.
9. The sealing assembly of an oil-filled cable terminal according to claim 8, wherein
the inner diameter of the through hole (l0l3a) of the second elastic sealing member
(1013) is 90%-96% of the outer diameter of the end portion (1 l3a) of the cable (113).
10. The sealing assembly of an oil-filled cable terminal according to claim 8, wherein
an inner diameter of the metal tube (1012) is greater than the outer diameter of the end portion ( 113 a) of the cable (113); and
a gap between an inner surface of the metal tube (1012) and an outer surface of the end portion ( 113 a) of the cable (113) is within a range of 5-10 mm.
11. The sealing assembly of an oil-filled cable terminal according to claim 10, wherein
an axis of the metal tube (1012) coincides with an axis of the through hole (l0l3a) of the second elastic sealing member (1013), so as to ensure that the end portion (1 l3a) of the cable (113) passing through the metal tube (1012) and the through hole (l0l3a) is centrally positioned in the metal tube (1012).
12. The sealing assembly of an oil-filled cable terminal according to claim 1, wherein
the first elastic sealing member (1011) and the second elastic sealing member (1013) are made of the same oil-resistant elastic material or from different oil-resistant elastic materials.
13. The sealing assembly of an oil-filled cable terminal according to claim 1, wherein the metal tube (1012) is made of a non-magnetic conductive metal material.
14. The sealing assembly of an oil-filled cable terminal according to claim 13, wherein the metal tube (1012) is made of copper or aluminum. 15. An oil-filled cable terminal, characterized by comprising: the sealing assembly (101) according to any one of claims 1-14.
16. The oil-filled cable terminal according to claim 15, wherein
the oil-filled cable terminal (10) further comprises a support plate (107) and a tail tube (108), wherein the support plate (107) and the tail tube (108) are sleeved on the cable (113), and are adapted to be fixed on one side of a bottom plate (110) used for mounting the oil-filled cable terminal (10);
when the support plate (107) and the tail tube (108) are fixed on the bottom plate (110), the support plate (107) compresses a first elastic sealing member (1011) of the sealing assembly (101) in a groove of the bottom plate (110), so as to achieve axial sealing between the oil-filled cable terminal (10) and the bottom plate (110).
17. The oil-filled cable terminal according to claim 16, wherein
the oil-filled cable terminal (10) further comprises an insulator (114), wherein the insulator (114) is sleeved on the cable (113), and is adapted to be fixed on the other side of the bottom plate (110), and an O-shaped seal ring is adopted for sealing between the insulator (114) and the bottom plate (110).
18. The oil-filled cable terminal according to claim 17, wherein
the oil-filled cable terminal (10) further comprises a first semi conductive strip (l02a), a first metal shield strip (l03a), and a first insulation strip (l04a), wherein the first semi conductive strip (l02a) is wound around a metal tube (1012) of the sealing assembly (101) and a metal sheath (111) of the cable (113), the first metal shield strip (l03a) is wound around the first semi conductive strip (l02a), and the first insulation strip (l04a) is wound around the first metal shield strip (l03a).
19. The oil-filled cable terminal according to claim 18, wherein
the oil-filled cable terminal (10) further comprises a second semiconductive strip (l02b), a second metal shield strip (l03b), and a second insulation strip (l04b), wherein the second semiconductive strip (l02b) is wound around the metal tube (1012) and a second elastic sealing member (1013) of the sealing assembly (101) and an outer semiconductive layer of the cable (1 l3a), the second metal shield strip (103b) is wound around the second semiconductive strip (l02b), and the second insulation strip (l04b) is wound around the second metal shield strip (l03b).
20. The oil-filled cable terminal according to claim 19, wherein
the oil-filled cable terminal (10) further comprises a first heat shrinkable tube (109) and a second heat shrinkable tube (106), wherein the first heat shrinkable tube (109) is heat-shrunk on the tail tube (108) and the cable (113), and the second heat shrinkable tube (106) is heat-shrunk on the second insulation strip (l04b).
21. The oil-filled cable terminal according to claim 18, wherein
the oil-filled cable terminal (10) further comprises a waterproof sealing strip (105), wherein the waterproof sealing strip (105) is wound around the first insulation strip (l04a).
22. The oil-filled cable terminal according to claim 19, wherein
the oil-filled cable terminal further comprises a copper braid (112) located between the metal sheath (111) and the first metal shield strip (l03a), wherein one end of the copper braid (112) and the first metal shield strip (l03a) is fastened in a first annular slot (l012a) of the metal tube (1012) of the sealing assembly (101) by a copper wire, and the other end is fastened on the metal sheath (111) of the cable (113) by a copper wire; and
after being fastened, the one end and the other end of the copper braid (112) and the first metal shield strip (103a) are respectively soldered to the metal tube (1012) and the metal sheath (111).
23. The oil-filled cable terminal according to claim 22, wherein
the other end of the second metal shield strip (l03b) is fastened in a second annular slot
(l0l2b) of the metal tube (1012) of the sealing assembly (101) by a copper wire; and
after being fastened, the other end of the second metal shield strip (103b) is soldered to the metal tube (1012).
24. The oil-filled cable terminal according to claim 19, wherein
the oil-filled cable terminal further comprises a copper braid (112) located between the metal sheath (111) and the first metal shield strip (l03a), one end of the copper braid (112) is soldered to the metal tube (1012) of the sealing assembly (101), and the other end is soldered to the metal sheath (111) of the cable (113).
25. The oil-filled cable terminal according to claim 16, wherein
the bottom plate (110) and the tail tube (108) are adapted to be connected to a ground terminal, and are used for grounding the oil-filled cable terminal.
PCT/IB2019/056695 2018-08-29 2019-08-06 Sealing assembly and oil-filled cable terminal WO2020044145A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201810996747.5A CN108963954B (en) 2018-08-29 2018-08-29 Sealing assembly and oil-filled cable terminal
CN201810996747.5 2018-08-29

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