CN-121983805-A - Feed-through connector

CN121983805ACN 121983805 ACN121983805 ACN 121983805ACN-121983805-A

Abstract

The invention relates to the technical field of electric connectors, in particular to a feed-through connector which comprises a feed-through insert, a coaxial cable, a coaxial connector with characteristic impedance of 50Ω, an epoxy sealing layer and a plug connector, wherein the feed-through insert is made of an insulating high polymer material, the feed-through insert comprises a mounting main body, the mounting main body is provided with a first side and a second side which are oppositely arranged along the axial direction, a mounting channel which penetrates through the mounting main body along the axial direction is arranged in the mounting main body, a plurality of bolt holes are formed in the mounting main body, the mounting channel comprises a first hole section and a second hole section which are sequentially communicated along the axial direction, the aperture of the first hole section is larger than that of the second hole section, the plug connector is fixedly arranged on the first side of the mounting main body and is coaxially and correspondingly arranged with the mounting channel, and stable coaxial transmission and sealing insulation effects are realized while mechanical connection reliability is kept.

Inventors

LIANG YUCHANG
HUANG YINGSHUN
LU YIQIANG
LIANG ZHICHENG
LU WEIXIAN

Assignees

广东亿讯电子有限公司

Dates

Publication Date: 20260505
Application Date: 20260402

Claims (10)

1. A feed-through connector, comprising a feed-through insert, a coaxial cable, a coaxial connector having a characteristic impedance of 50Ω, an epoxy sealing layer, and a plug; the feed-through insert is made of an insulating high polymer material and comprises a mounting main body, wherein the mounting main body is provided with a first side and a second side which are oppositely arranged along the axial direction, a mounting channel penetrating along the axial direction is arranged in the mounting main body, and a plurality of bolt holes are formed in the mounting main body; The mounting channel comprises a first hole section and a second hole section which are communicated in sequence along the axial direction, the aperture of the first hole section is larger than that of the second hole section, and the plug connector is fixedly arranged on the first side of the mounting main body and coaxially and correspondingly arranged with the mounting channel; The coaxial cable is arranged in the mounting channel in a penetrating way and comprises an inner conductor, an insulating medium layer coated on the periphery of the inner conductor and an outer conductor coated on the periphery of the insulating medium layer; one end of the coaxial cable sequentially penetrates through the second hole section and the first hole section from the second side of the mounting main body to the first side and then is connected with the plug connector, the epoxy resin sealing layer is filled between the inner wall of the second hole section and the periphery of the coaxial cable, and the epoxy resin sealing layer is solidified to form a sealing and fixing section surrounding the coaxial cable; The coaxial connector is arranged at the other end of the coaxial cable and is positioned at the second side of the mounting main body, the coaxial connector comprises a central contact piece and an outer contact piece, the central contact piece is electrically connected with the inner conductor, the outer contact piece is electrically connected with the outer conductor, and the central contact piece and the outer contact piece are coaxially arranged.
2. The feedthrough connector of claim 1, wherein an annular gap is formed between an inner wall of the second hole segment and the outer circumference of the coaxial cable, the epoxy sealing layer filling within the annular gap.
3. The feedthrough connector of claim 1 or 2, wherein the feedthrough insert and the epoxy sealing layer together form a wall-penetrating hermetic insulation around the coaxial cable.
4. The feedthrough connector of claim 2, wherein an annular transition step is formed between the first and second bore segments, the epoxy sealing layer being disposed against the annular transition step to form an axially-position-limited seal-retaining segment.
5. The feedthrough connector of claim 1, wherein the epoxy sealing layer is integral with an inner wall of the second hole section and an outer circumference of the coaxial cable.
6. The feedthrough of claim 1, wherein the coaxial connector is a radio frequency coaxial connector, the characteristic impedance of the coaxial cable is 50Ω, the maximum contact resistance of the feedthrough is no greater than 20mΩ, the insulation resistance is no less than 1000mΩ, and the withstand time at 150Vac voltage is 30 seconds.
7. The feedthrough connector of claim 6, wherein the characteristic impedance Z0 of the coaxial transmission structure of the coaxial cable and the coaxial connector satisfies the formula: Z0=(138/√εr)lg(D/d), wherein εr represents the relative permittivity of the insulating dielectric layer, D represents the inner diameter of the outer conductor, D represents the outer diameter of the inner conductor, and Z0 is 50Ω.
8. The feed-through connector according to claim 1, wherein the inner conductor is a stranded conductor formed by stranding a plurality of conductive monofilaments, the conductive monofilaments are copper monofilaments or copper alloy monofilaments, a conductive plating layer is arranged on the periphery of the inner conductor, the conductive plating layer is silver plating layer or tin plating layer, a stepped stripping section is formed at one end of the coaxial cable close to the coaxial connector so that the inner conductor, the insulating medium layer and the outer conductor form connection sections which are staggered in sequence along the axial direction, the central contact piece is provided with a central connection part connected with the inner conductor, the outer contact piece is provided with an outer connection part connected with the outer conductor, the central connection part is fixedly connected with the inner conductor, and the outer connection part is fixedly connected with the outer conductor.
9. The feed-through connector of claim 8, wherein the central connection portion is a sleeve-type contact structure and the outer connection portion is a surrounding contact structure, the central connection portion and the outer connection portion being radially spaced apart, the central connection portion being correspondingly clamped to the outer periphery of the inner conductor, the outer connection portion being correspondingly wrapped around the outer periphery of the outer conductor to form a continuous coaxial connection interface between the coaxial connector and the coaxial cable.
10. The feedthrough connector of claim 2, wherein the inner wall of the second bore section is provided with at least one circumferentially extending annular retaining groove or annular consolidation recess, the epoxy sealing layer partially filling in the annular retaining groove or annular consolidation recess and forming an axial retaining structure for the coaxial cable after curing.

Description

Feed-through connector Technical Field The invention relates to the technical field of electric connectors, in particular to a feed-through connector. Background Feed-through connectors are a type of electrical connection means provided at openings in a partition wall, bulkhead, housing wall or other structure for transmitting electrical signals or power from one side of the structure to the other and maintaining the sealing and insulating properties of the installation site as much as possible during transmission. For the case of transmitting signals in a coaxial manner, the feed-through connector is usually used together with a coaxial cable, a coaxial connector or a plug so as to form a continuous coaxial transmission path, and is widely applied to underwater equipment, sealed cabins, pressure-resistant equipment and other devices requiring through-wall conductive connection. In the prior art, although the common electric connector can realize conductive connection, when the common electric connector is installed in a structure opening and bears the function of wall-penetrating conductive connection, the common electric connector is difficult to simultaneously meet the requirements of installation fixation, sealing insulation, high-frequency coaxial transmission and the like. Particularly when a coaxial structure is used for transmitting high-frequency signals, besides the reliable electric connection between the central conductor and the outer conductor, the connector is required to have a stable coaxial structure and an impedance matching relation, so that signal reflection and transmission loss are reduced. In addition, after the feedthrough connector is disposed at the opening of the structure under underwater or pressure environment, it is necessary to combine the installation stability, the partial seal holding capability and the insulation reliability during long-term use. The existing part wall-penetrating connecting structure still has the following defects that (1) the matching structure of the mounting main body and an external mounting interface is simpler, the fixing strength and the overall mounting stability are insufficient, (2) when a cable passes through a structure opening, the local sealing structure is not tightly matched with an insulating supporting structure, a long-term stable sealing insulating interface is difficult to form, (3) the continuity of a connecting transition structure between a coaxial cable and a coaxial connector or a plug connector is insufficient, the stable characteristic impedance and high-frequency transmission performance are not easy to maintain, (4) the existing part structure is difficult to simultaneously consider the requirements of electrical indexes such as lower contact resistance, higher insulating resistance, voltage resistance and the like, and (5) the conductor connecting mode of the connecting end is simpler, the structural transition of a central conductor and an external conductor in a connecting area is not reasonable enough, and the connection reliability and the coaxial transmission consistency are easy to influence. Accordingly, there is still a need in the art for a feedthrough connector that addresses the deficiencies of wall-penetrating conductive connection in terms of installation stability, sealing insulation, and high frequency coaxial signal transmission performance. Disclosure of Invention To solve at least one of the above problems in the prior art, the present invention is directed to a feed-through connector. The purpose of the invention is realized in the following way: A feedthrough connector comprising a feedthrough insert, a coaxial cable, a coaxial connector having a characteristic impedance of 50Ω, an epoxy sealing layer, and a plug; the feed-through insert is made of an insulating high polymer material and comprises a mounting main body, wherein the mounting main body is provided with a first side and a second side which are oppositely arranged along the axial direction, a mounting channel penetrating along the axial direction is arranged in the mounting main body, and a plurality of bolt holes are formed in the mounting main body; the mounting channel comprises a first hole section and a second hole section which are sequentially communicated along the axial direction, the aperture of the first hole section is larger than that of the second hole section, the plug connector is fixedly arranged on the first side of the mounting main body and is coaxially and correspondingly arranged with the mounting channel, the coaxial cable penetrates through the mounting channel, the coaxial cable comprises an inner conductor, an insulating medium layer coated on the outer periphery of the inner conductor and an outer conductor coated on the outer periphery of the insulating medium layer, one end of the coaxial cable sequentially penetrates through the second hole section and the first hole section from the second side of the mounting