Electrical penetration assembly feedthrough assembly and method of assembly

Abstract

The electrical penetration assembly feed-through assembly comprises an inner sleeve used for containing an insulated wire, the inner sleeve and an outer sleeve are coaxially connected in a sleeved mode and located on the inner side of the outer sleeve, an insulated sleeve is arranged between the inner sleeve and the outer sleeve, and the inner sleeve, a filling layer and the outer sleeve are axially sealed and electrically isolated in the radial direction. And connectors are arranged at the two ends. The inner sleeve serves as a shielding layer of the insulated wire, the outer sleeve serves as an installation interface of the feed-through assembly and the electrical penetration assembly, the inner sleeve and the outer sleeve are electrically isolated through the insulated sleeve, electrical isolation between the shielding layer of the feed-through assembly and the electrical penetration assembly body is achieved, and mutual interference between signals of different channels is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear energy equipment, and in particular to an electrical penetration component feed-through assembly and an assembly method. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The containment is the third barrier of a nuclear power plant. Its main function is to prevent radioactive substances from being released into the electrical environment under accident conditions (especially LOCA accidents, i.e., loss of coolant accidents). The containment is equipped with electrical penetrations for cables to pass through the containment to ensure the integrity of the containment and the stability of the electrical connection under operation and accident conditions. The electrical penetrations need to ensure both electrical and mechanical sealing functions.

[0004] The electrical penetration usually has a barrel, a flange and several feed-through components, and the feed-through components as a whole pass through the front and rear flange panels of the electrical penetration. For example, an electrical penetration in the prior art CN117198568 includes a barrel, an internal terminal box, an external terminal box and a feed-through line passing through the barrel. The feed-through line includes an outer tube, a filling body and a conductor, the conductor is passed through the outer tube, the filling body is arranged on the conductor and is located between the conductor and the outer tube, and the outer tube of the feed-through line can be used as a shielding layer for the internal conductor.

[0005] Since each electrical penetration will be installed with multiple feed-throughs, the feed-throughs are generally fixed and sealed to the penetrations by metal ferrule assemblies, and the electrical penetrations are welded and sealed to the nuclear power plant containment, which is equivalent to all conductors of all electrical penetrations in a nuclear power plant sharing a shielding layer, resulting in poor shielding effect of the conductors and making signals susceptible to electromagnetic interference. Summary of the invention

[0006] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides an electrical penetration component feedthrough assembly and an assembly method, so that the shielding layer of the feedthrough assembly is electrically isolated from the body of the electrical penetration component to ensure that the signals in the electrical penetration component do not interfere with each other.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] The first aspect of the present invention provides an electrical penetration feedthrough assembly, comprising an inner sleeve for accommodating an insulated wire, the inner sleeve being coaxially sleeved with an outer sleeve and being located on the inner side of the outer sleeve, an insulating sleeve being provided between the inner sleeve and the outer sleeve, the inner sleeve, a filling layer and the outer sleeve being axially sealed and radially electrically isolated, and connectors being provided at both ends.

[0009] Furthermore, the connector includes a shell, a tail cover is provided at one end of the shell, a conductor is provided inside the shell, and an insulator is provided between the shell and the conductor.

[0010] Furthermore, the tail cover is located inside the inner sleeve, and the insulated wire is inserted into the tail cover and connected to the conductor.

[0011] Furthermore, the connector is sealed by glass metal sintering or ceramic metal brazing, and the shell, conductor and insulator are made into a sealed whole.

[0012] Further, the insulating sleeve fills up the cavity between the inner sleeve and the outer sleeve, or the insulating sleeve fills up both ends of the cavity between the inner sleeve and the outer sleeve.

[0013] Furthermore, the material of the insulating sleeve includes at least one or more of polyetheretherketone, polypropylene or epoxy resin.

[0014] Furthermore, the insulated conductor is a mineral insulated conductor, a fiber wrapped conductor or a PEEK extruded conductor.

[0015] Furthermore, one or more unloading grooves are provided on the circumferential outer side of the inner sleeve and the circumferential inner side of the outer sleeve.

[0016] Furthermore, it is provided with one or more holes which radially penetrate the inner sleeve, the insulator and the outer sleeve for sealing test and monitoring.

[0017] A second aspect of the present invention provides a method for assembling an electrical feedthrough assembly, comprising the following steps:

[0018] The inner sleeve, insulating sleeve and outer sleeve are assembled from the inside to the outside, and after assembly, they are pressed together by a spinning device to achieve axial sealing and radial electrical isolation among the three.

[0019] The shell, conductor and insulator are assembled in sequence, and glass-metal sintering or ceramic-metal brazing is performed to form a sealed whole, and then the tail cover is assembled to form a connector;

[0020] The insulated wire is inserted into the inner sleeve, the connector is arranged at both ends of the inner sleeve, the conductors at both ends of the insulated wire are respectively connected to the conductors of the connector, and the tail cover of the connector is connected to the inner sleeve to obtain an assembled electrical penetration feedthrough component.

[0021] Compared with the prior art, one or more of the above technical solutions have the following beneficial effects:

[0022] 1. The electrical penetration feedthrough assembly uses the inner sleeve as the shielding layer of the insulated wire, and the outer sleeve as the installation interface between the feedthrough assembly and the electrical penetration. The inner sleeve and the outer sleeve are electrically isolated by the insulating sleeve located between the inner sleeve and the outer sleeve, thereby realizing electrical isolation between the shielding layer of the feedthrough assembly and the electrical penetration body, and avoiding mutual interference between signals of different channels.

[0023] 2. The feed-through assembly is wired using a connector, and the shielding layer of the wire is continuously connected, so that an independent and closed electrical transmission channel is formed inside the assembly. The electromagnetic compatibility of the electrical penetration is further improved, meeting the use requirements of nuclear power reactors related to waterproofing and easy installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0025] Figure 1 is a schematic diagram of the structure of an electrical penetration feedthrough assembly provided by one or more embodiments of the present invention;

[0026] Figure 2 It is a schematic structural diagram of a double-layer casing assembly provided by one or an embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of a connector provided by one or embodiments of the present invention.

[0028] In the figure, 1-outer sleeve, 2-insulating sleeve, 3-inner sleeve, 4-insulated wire, 5-connector, 6-channel, 11-outer sleeve unloading groove, 31-inner sleeve unloading groove, 51-housing, 52-tail cover, 53-conductor, 54-insulator. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0031] Terminology explanation:

[0032] Safety barrier refers to the key design in a nuclear power plant that ensures that radioactive materials do not leak into the environment. Generally, a nuclear power plant has three safety barriers.

[0033] The first safety barrier is the fuel pellets and fuel cladding. The fuel pellets are usually made of sintered uranium dioxide ceramics. Most of their microporous structures are not connected to the outside world and can retain most of the radioactive materials produced by nuclear fission. The fuel pellets are loaded into cladding made of zirconium alloy or stainless steel to form fuel element rods.

[0034] The second safety barrier is a pressure vessel and a closed primary circuit system. The pressure vessel is used to enclose the core composed of nuclear fuel.

[0035] The third safety barrier is the containment (reactor building), which is generally a prestressed reinforced concrete structure with a thickness of 1 meter and a steel lining on the inner surface, which has good sealing performance. The containment is also equipped with a safety injection system, a containment spray system, a hydrogen removal system, an air purification and cooling system, etc. to cope with possible extreme accidents.

[0036] Since various systems require power supply and transmission of control signals, electrical penetrations are installed on the containment for cables to pass through the containment. The electrical penetrations have corresponding design requirements in terms of sealing, electrical continuity, and pressure and temperature resistance.

[0037] As introduced in the background technology, in the prior art, since multiple feed-throughs are installed in each electrical penetration, the feed-throughs are generally fixed and sealed to the penetrations through metal ferrule assemblies, and the electrical penetrations are welded and sealed to the nuclear power plant containment, which is equivalent to all conductors of all electrical penetrations in a nuclear power plant sharing a shielding layer, resulting in poor shielding effect of the conductors and making it easy for signals to be affected by electromagnetic interference.

[0038] Therefore, the following embodiments provide an electrical penetration feedthrough assembly and an assembly method, so that the shielding layer of the feedthrough assembly is electrically isolated from the body of the electrical penetration, ensuring that the signals in the electrical penetration do not interfere with each other.

[0039] Embodiment 1:

[0040] The electrical penetration feedthrough assembly comprises an inner sleeve 3, an insulating sleeve 2 and an outer sleeve 1 which are coaxially sleeved from the inside to the outside in sequence. The inner sleeve 3 contains an insulated wire 4, and connectors 5 are provided at both ends. The connector 5 comprises a housing 51, a tail cover 52 is provided at the rear end of the housing 51, a conductor 53 is provided inside the housing 51, and an insulator 54 is provided between the housing 51 and the conductor 53. The insulated wire 4 is inserted into the tail cover 52 and connected to the conductor 53.

[0041] In this embodiment, Figure 1 As shown, the electrical penetration feedthrough assembly includes an outer sleeve 1 , an insulating sleeve 2 , an inner sleeve 3 , an insulated wire 4 and a connector 5 .

[0042] In this embodiment, Figure 2As shown, the insulating sleeve 2 is arranged outside the inner sleeve 3, and the outer sleeve 1 is arranged outside the insulating sleeve 2. After the inner sleeve 3, the insulating sleeve 2, and the outer sleeve 1 are assembled, they are pressed by a spinning device to achieve axial sealing and radial electrical isolation between the three.

[0043] The insulating sleeve 2 is made of polyetheretherketone, polymaple or other engineering plastics, or a combination of several thereof. In this embodiment, the insulating sleeve 2 is made of polyetheretherketone.

[0044] The insulating sleeve 2 may be composed of one section or multiple sections. In this embodiment, the insulating sleeve 2 is composed of six sections, which are connected end to end and arranged in sequence.

[0045] The insulating sleeve 2 can fill the cavity between the inner sleeve and the outer sleeve, or can be filled in sections. In this embodiment, the insulating sleeve 2 is filled in two sections, respectively filling the two ends of the cavity between the inner sleeve 1 and the outer sleeve 3. Alternatively, the insulating sleeve 2 is omitted, and epoxy resin or other materials are used to pot between the inner sleeve 3 and the outer sleeve 1.

[0046] The inner sleeve 3 is a seamless pipe, made of stainless steel or other metal materials. At least one unloading groove is provided on the outer side of the circumference. In this embodiment, the inner sleeve 3 is a seamless stainless steel pipe, and two inner sleeve unloading grooves 31 are provided on the outer side of the circumference.

[0047] The outer sleeve 1 is a seamless pipe made of stainless steel or other metal materials. At least one unloading groove is provided on the inner side of the circumference. In this embodiment, the outer sleeve 1 is a seamless stainless steel pipe, and two outer sleeve unloading grooves 11 are provided on the inner side of the circumference.

[0048] One or more insulated conductors 4 may be arranged. Figure 3 As shown, the insulated wires 4 are arranged inside the inner sleeve 3, and 9 insulated wires 4 are arranged.

[0049] The insulated conductor 4 is a mineral insulated conductor, a fiber wrapped conductor or a PEEK extruded conductor, or a combination of several thereof. In this embodiment, the insulated conductor 4 is a fiber wrapped conductor.

[0050] The core wire of the insulated wire 4 is made of copper, nickel or alloy. In this embodiment, the core wire of the insulated wire 4 is made of copper.

[0051] In this embodiment, Figure 3 As shown, the connector 5 is arranged at both ends of the inner sleeve 3, and includes a shell 51, a tail cover 52 arranged at the rear end of the shell, a conductor 53 arranged inside the shell, and an insulator 54 arranged between the shell and the conductor.

[0052] One or more conductors may be arranged in the housing 51. In this embodiment, nine conductors 53 are arranged in the housing 51.

[0053] The housing 51 is made of stainless steel or other metal materials. The insulator 54 can be made of glass and / or ceramic. In this embodiment, the housing 51 is made of stainless steel, the tail cover 52 is made of stainless steel, the conductor 53 is made of copper, and the insulator 54 is made of glass.

[0054] The connector 5 is sealed by glass metal sintering or ceramic metal brazing. In this embodiment, the connector 5 is sealed by glass metal sintering, and the housing 51, the conductor 53 and the insulator 54 are made into a sealed whole.

[0055] The conductor 53 of the connector 5 is fixedly connected to the insulated wire 4 by crimping, termination, welding or other methods. One end of the tail cover 52 is fixedly connected to the housing 51 by thread, bayonet, welding or other methods, and the other end is fixedly connected to the inner sleeve 3 by welding or other methods.

[0056] In this embodiment, the conductor 53 of the connector 5 is fixedly connected to the insulated wire 4 by welding, one end of the tail cover 52 is fixedly connected to the housing 51 by welding, and the other end is fixedly connected to the inner sleeve 3 by welding.

[0057] In this embodiment, one or more outer circular flats are provided on the outer periphery of the tail cover 54 for clamping and / or fixing.

[0058] In this embodiment, one or more holes 6 are provided in the middle of the feed-through assembly, which radially penetrate the inner sleeve, the insulator and the outer sleeve, for sealing test and monitoring.

[0059] This embodiment provides an electrical penetration feedthrough assembly with electrical isolation function, wherein the inner sleeve 3 is used as the shielding layer of the insulated wire 4, and the outer sleeve 1 is used as the installation interface between the feedthrough assembly and the electrical penetration, so as to realize the electrical isolation between the shielding layer of the feedthrough assembly and the electrical penetration body, and avoid mutual interference between signals of different channels. At the same time, the wiring method of the feedthrough assembly adopts a connector 5, and the shielding layer of the wire is continuously connected, so that an independent and closed electrical transmission channel is formed inside the assembly, and the electromagnetic compatibility of the electrical penetration is further improved, meeting the use requirements of waterproof and easy installation. When in use, the electrical lines between the containment and the set space are connected through the connectors at both ends.

[0060] In the prior art, the electrical penetrations used in nuclear power plants are usually composed of a cylinder and several feedthrough assemblies that penetrate the cylinder, and the cylinder and the feedthrough assemblies are fixed and sealed with a metal ferrule assembly. The outer tube of the feedthrough line can be used as a shielding layer for the internal conductor. Since each electrical penetration will be installed with multiple feedthroughs, the outer tube of the feedthrough line is fixed and sealed with the penetration by a metal ferrule assembly, and the electrical penetration is welded and sealed with the nuclear power plant containment, which is equivalent to all conductors of all electrical penetrations in a nuclear power plant sharing one shielding layer. The shielding effect of the conductors is poor, and the signals are easily affected by electromagnetic interference. At the same time, the wiring method of the feedthrough line usually adopts terminal blocks, cold crimping or wire noses, which are not waterproof and the wiring is complicated.

[0061] Compared with the prior art, the structure provided in this embodiment has the following beneficial effects:

[0062] (1) The electrical penetration feedthrough assembly uses the inner sleeve as the shielding layer of the insulated wire and the outer sleeve as the installation interface between the feedthrough assembly and the electrical penetration. The inner sleeve and the outer sleeve are electrically isolated by the insulating sleeve to achieve electrical isolation between the shielding layer of the feedthrough assembly and the electrical penetration body, thereby avoiding mutual interference between signals of different channels.

[0063] (2) The feed-through assembly is wired using a connector, and the shielding layer of the wire is continuously connected, so that an independent and closed electrical transmission channel is formed inside the assembly. The electromagnetic compatibility of the electrical penetration is further improved, meeting the requirements of waterproofing and easy installation.

[0064] Embodiment 2:

[0065] A method for assembling an electrical feedthrough assembly comprises the following steps:

[0066] (1) The inner sleeve 3, the insulating sleeve 2 and the outer sleeve 1 are assembled from the inside to the outside, and after the assembly is completed, they are pressed together by a spinning device to achieve axial sealing and radial electrical isolation among the three;

[0067] (2) Assembling the housing 51, the conductor 53 and the insulator 54 in sequence, performing glass-metal sintering to form a sealed whole, and then assembling the tail cover 52 to form the connector 5;

[0068] (3) The insulated wire 4 is inserted into the inner sleeve 3, and the connector 5 is arranged at both ends of the inner sleeve 3. The conductors at both ends of the insulated wire 4 are respectively connected to the conductors 53 of the connector 5 at both ends (welding can be used), and the tail cover 52 of the connector 5 is connected to the inner sleeve 3 (welding can be used) to form a sealed feed-through assembly.

[0069] Steps (1) and (2) are performed in no particular order.

[0070] The electrical penetration feedthrough assembly obtained by the above method uses the inner sleeve as the shielding layer of the insulated wire and the outer sleeve as the installation interface between the feedthrough assembly and the electrical penetration. By electrically isolating the inner sleeve and the outer sleeve, the electrical isolation of the feedthrough assembly shielding layer and the electrical penetration body is achieved, thereby avoiding mutual interference between signals of different channels.

[0071] At the same time, the feed-through component is wired using a connector, and the shielding layer of the wire is continuously connected, so that an independent and closed electrical transmission channel is formed inside the component. The electromagnetic compatibility of the electrical penetration parts is further improved to meet the requirements of waterproofing and easy installation.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electrical feedthrough assembly, characterized in that: It includes an inner sleeve for accommodating an insulated wire. The inner sleeve is coaxially sleeved with an outer sleeve and is located on the inner side of the outer sleeve. An insulating sleeve is arranged between the inner sleeve and the outer sleeve. The inner sleeve, the filling layer and the outer sleeve are axially sealed and radially electrically isolated. Connectors are arranged at both ends.

2. The electrical penetration feedthrough assembly according to claim 1, wherein: The connector comprises a shell, one end of which is provided with a tail cover, a conductor is provided inside the shell, and an insulator is provided between the shell and the conductor.

3. The electrical penetration feedthrough assembly according to claim 2, wherein: The tail cover is located inside the inner sleeve, and the insulated wire is inserted into the tail cover and connected to the conductor.

4. The electrical penetration feedthrough assembly of claim 1, wherein: The connector is sealed by glass-metal sintering or ceramic-metal brazing, and the shell, conductor and insulator are made into a sealed whole.

5. The electrical penetration feedthrough assembly of claim 1, wherein: The insulating sleeve fills the cavity between the inner sleeve and the outer sleeve, or the insulating sleeve fills both ends of the cavity between the inner sleeve and the outer sleeve.

6. The electrical penetration feedthrough assembly of claim 1, wherein: The material of the insulating sleeve includes at least one or more of polyetheretherketone, polypropylene or epoxy resin.

7. The electrical penetration feedthrough assembly of claim 1, wherein: The insulated conductor is a mineral insulated conductor, a fiber wrapped conductor or a PEEK extruded conductor.

8. The electrical penetration feedthrough assembly of claim 1, wherein: One or more unloading grooves are arranged on the circumferential outer side of the inner sleeve and the circumferential inner side of the outer sleeve.

9. The electrical penetration feedthrough assembly of claim 1, wherein: It also has one or more holes which radially penetrate the inner sleeve, the insulator and the outer sleeve for sealing test and monitoring.

10. The assembly method of the electrical penetration feedthrough assembly according to any one of claims 1 to 9, characterized in that: The following steps are involved: The inner sleeve, insulating sleeve and outer sleeve are assembled from the inside to the outside, and after assembly, they are pressed together by a spinning device to achieve axial sealing and radial electrical isolation among the three. The shell, conductor and insulator are assembled in sequence, and glass-metal sintering or ceramic-metal brazing is performed to form a sealed whole, and then the tail cover is assembled to form a connector; The insulated wire is inserted into the inner sleeve, the connector is arranged at both ends of the inner sleeve, the conductors at both ends of the insulated wire are respectively connected to the conductors of the connector, and the tail cover of the connector is connected to the inner sleeve to obtain an assembled electrical penetration feedthrough component.

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