Nuclear power station cable assembly and manufacturing process thereof

Abstract

The invention discloses a nuclear power station cable assembly and a manufacturing process thereof, the nuclear power station cable assembly is used for adapting to a fission chamber detector, the nuclear power station cable assembly comprises a cable body, a first connector and a second connector, and the cable body comprises a core wire, an insulating layer and a shielding shell which are sequentially arranged from inside to outside; the first connector is arranged at one end of the cable body and used for being connected with a fission chamber detector, the first connector comprises a male plug and an explosive welding head, the male plug and the cable body are welded together through the explosive welding head, and the male plug is electrically connected with the core wire; the second connector is arranged at the other end, far away from the first connector, of the cable body, and the second connector and the cable body are welded together; the second connector comprises a coaxial connector, an inner conductor is arranged in the coaxial connector, and the inner conductor is electrically connected with the core wire. The nuclear power station cable assembly provided by the invention has excellent anti-electromagnetic interference performance while being well matched with the fission chamber detector, and can ensure stable transmission of measurement signals of the fission chamber detector.

Description

Technical Field

[0001] The present application relates to the field of nuclear measurement detectors in nuclear power plants, and in particular to a nuclear power plant cable assembly and a manufacturing process of the nuclear power plant cable assembly. Background Art

[0002] The fission chamber detector is a device used to measure and detect nuclear fission reactions. It is commonly used in the field of nuclear energy, radioactive material research, and nuclear reactor monitoring. By measuring the number and characteristics of fission reactions, the fission chamber detector can evaluate the fission performance and radioactivity level of nuclear materials, which is of great significance to nuclear energy safety and radiation monitoring. The fission chamber detector is a primary instrument in the middle range of the nuclear instrument system. It is used to convert the nuclear signal of the reactor into an electrical signal (pulse, root mean square voltage, etc.). The safety level is 1E, which is an important guarantee for the safe operation of the reactor. The fission chamber detector needs to meet the sensitivity and neutron injection rate measurement range requirements of the technical specification. The cable assembly that matches the fission chamber detector also plays a vital role in the signal acquisition of the detector.

[0003] In the prior art, under accident conditions, the accuracy of the detector in measuring the reactor neutron level is reduced, and during the signal transmission process, it is susceptible to severe electromagnetic interference. Currently, there is no nuclear power plant cable assembly that can be specifically adapted to the fission chamber detector. Summary of the invention

[0004] In order to solve one of the technical problems existing in the prior art, the present application provides a cable with anti-interference capability that can be adapted to a fission chamber detector and a manufacturing process of the cable. By using the cable in combination with the fission chamber detector, the electromagnetic interference to the signal collected by the fission chamber detector during the transmission process can be reduced, thereby improving the accuracy of the measurement signal acquisition.

[0005] A nuclear power plant cable assembly provided according to some embodiments of the present application is used to adapt to a fission chamber detector, including: a cable body, the cable body including a core wire, an insulating layer and a shielding shell arranged in sequence from the inside to the outside, the shielding shell being arranged outside the core wire to shield external electromagnetic interference, and the insulating layer separating the core wire and the shielding shell; a first connector, the first connector being arranged at one end of the cable body for connecting to the fission chamber detector, the first connector including a male plug and an explosion welding head, the male plug being welded to the cable body through the explosion welding head, and the male plug being electrically connected to the core wire; a second connector, the second connector being arranged at the other end of the cable body away from the first connector, and the second connector being welded to the cable body; the second connector including a coaxial connector, an inner conductor being arranged inside the coaxial connector, and the inner conductor being electrically connected to the core wire.

[0006] In some embodiments, the cable body further includes a protective outer layer disposed outside the shielding housing, and the protective outer layer is made of PEEK material.

[0007] In some embodiments, it further includes brazing fixing tubes. There are two brazing fixing tubes disposed on the cable body, and the two brazing fixing tubes are respectively located at the welding joints of the cable body with the first connector and the cable body with the second connector.

[0008] In some embodiments, it further includes a first heat shrinkable tube sleeved outside the cable body. The first heat shrinkable tube covers the welding joints of the cable body with the first connector and the cable body with the second connector, and the brazing fixing tubes are located inside the first heat shrinkable tube.

[0009] In some embodiments, it further includes a second heat shrinkable tube sleeved outside the cable body, and at least part of the second heat shrinkable tube overlaps with the first heat shrinkable tube.

[0010] In some embodiments, the male plug includes a welding tube, a lead tube, and an insulating member for separating the welding tube and the lead tube, and the lead tube is electrically connected to the core wire.

[0011] In some embodiments, the explosive welding head includes a first end and a second end disposed opposite to each other. The first end is used to connect to the welding tube, and the second end is used to connect to the brazing fixing tube; wherein, the material of the first end is different from that of the second end, the material of the first end is the same as that of the welding tube, and the material of the second end is the same as that of the brazing fixing tube.

[0012] In addition, the present application also provides a manufacturing process for manufacturing the above-mentioned nuclear power plant cable assembly, including the following steps: S1. Docking and installing the welding pipe of the male plug with the first end of the explosive welding joint, and fastening them by welding to obtain the first connector; S2. Determine the length of the cable body according to the installation depth of the fission chamber detector, and cut the cable body to obtain the cable body with the corresponding length; S3. Straighten the cable body, and use an ultrasonic wire stripper to strip the insulating layer and the shielding outer shell of the cable body near both ends until the core wire is exposed by 40-60 mm, and polish the surface oxide layer of the exposed core wire; S4. Fix two brazing fixing pipes at both ends of the cable body, insert the explosive welding joint end of the first connector into one end of the cable body, and electrically connect the core wire with the male plug, and one of the brazing fixing pipes is in contact with the explosive welding joint; Insert the second connector into the other end of the cable body, electrically connect the inner conductor with the core wire, and the other brazing fixing pipe is in contact with the second connector; S5. Weld and fix the brazing fixing pipes with the corresponding contact explosive welding joint and the second connector respectively, so that the first connector and the second connector are fixed at both ends of the cable body to obtain a nuclear power plant cable assembly.

[0013] In some embodiments, in the above step S5, the brazing fixing pipe and the explosive welding joint, the second connector are welded and fixed by at least one of laser welding and high-frequency induction welding.

[0014] In some embodiments, it further includes step S6 of welding and fixing an outlet pipe on the nuclear power plant cable assembly: first, sleeved the outlet pipe on the nuclear power plant cable assembly; before welding the outlet pipe, use a hot air gun at 150 °C to dry the outlet pipe for 2 minutes; then fix the nuclear power plant cable assembly in a rotatable device; use laser welding to weld the outlet pipe and the nuclear power plant cable assembly together; finally, conduct a water immersion test on the nuclear power plant cable assembly with the outlet pipe welded.

[0015] In some embodiments, it further includes step S7 of sealing a connector on the nuclear power plant cable assembly.

[0016] The beneficial effects of the present application are as follows: The present application provides a nuclear power plant cable assembly and its manufacturing process. The nuclear power plant cable assembly can be adapted to the fission chamber detector, and the cable body is provided with a shielding outer shell. While being well adapted to the fission chamber detector, it has excellent anti-electromagnetic interference performance. Under accident conditions, it can still ensure the stable transmission of the measurement signal of the fission chamber detector. And adopting the above manufacturing process simplifies the manufacturing process, improves the manufacturing efficiency, and reduces the time and labor intensity of manual operation.

[0017] Other features and advantages of the present application will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the present application. The objectives and other advantages of the present application may be realized and attained by the structure particularly pointed out in the specification, claims and drawings. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions of the present application, the present application will be further described below in conjunction with the drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings. In the drawings:

[0019] Figure 1 is a schematic structural diagram of a nuclear power plant cable assembly provided by the present application;

[0020] Figure 2 is a schematic structural diagram of a male plug;

[0021] Figure 3 is a schematic structural diagram of a cable body.

[0022] Reference numeral description:

[0023] Male plug 100, lead pipe 110, insulating member 120, welding pipe 130, explosive welded joint 200, brazing fixing pipe 300, first heat shrinkable sleeve 400, second heat shrinkable sleeve 500, cable body 600, core wire 610, insulating layer 620, shielding shell 630, protective outer layer 640, coaxial connector 700, silicone rubber pad 710, connector protection cap 720. Detailed Description of the Embodiments

[0024] The present application will be further described in detail below in conjunction with the drawings through specific embodiments. Similar elements in different embodiments are labeled with related similar reference numerals. In the following embodiments, many detailed descriptions are provided to enable a better understanding of the present application. However, those skilled in the art can easily recognize that some of these features can be omitted in different situations, or can be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification to avoid overwhelming the core part of the present application with excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0025] In addition, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. Meanwhile, the steps or actions in the method description can also be reordered or adjusted in a manner obvious to those skilled in the art. Therefore, the various sequences in the specification and drawings are only for clearly describing a certain embodiment and do not mean a necessary sequence, unless it is stated otherwise that a certain sequence must be followed.

[0026] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. And the "connection" and "coupling" mentioned in this application, unless otherwise specified, both include direct and indirect connection (coupling).

[0027] The following Figures 1 to 3 With reference to the embodiments provided below, the nuclear power plant cable assembly and its manufacturing process proposed in this application will be further elaborated.

[0028] As Figures 1 to 3 shown, in some embodiments, this application provides a nuclear power plant cable assembly for adapting to a fission chamber detector. The nuclear power plant cable assembly of this application includes a cable body 600, a first connector, and a second connector. Among them, the cable body 600 includes a core wire 610, an insulating layer 620, and a shielding outer shell 630 arranged in sequence from the inside to the outside. The core wire 610 is used to transmit electrical signals. The shielding outer shell 630 is arranged outside the core wire 610 to shield external electromagnetic interference. Preferably, the shielding outer shell 630 is made of a metal material, and the shielding outer shell 630 completely surrounds the core wire 610 to improve the electromagnetic interference resistance of the cable body 600; the insulating layer 620 separates the core wire 610 and the shielding outer shell 630. The first connector is arranged at one end of the cable body 600 for connecting to the fission chamber detector. The first connector includes a male plug 100 and an explosive welding head 200. The male plug 100 is welded to the cable body 600 through the explosive welding head 200, and the male plug 100 is electrically connected to the core wire 610. The second connector is arranged at the other end of the cable body 600 away from the first connector. The second connector is welded to the cable body 600. The second connector includes a coaxial connector 700. An inner conductor is arranged inside the coaxial connector 700, and the inner conductor is electrically connected to the core wire 610. This nuclear power plant cable assembly can adapt to the fission chamber detector, and the cable body is provided with a shielding outer shell 630. While being well adapted to the fission chamber detector, it has excellent electromagnetic interference resistance performance and can still ensure the stable transmission of the measurement signal of the fission chamber detector under accident conditions.

[0029] As Figure 3As shown, in some embodiments, the cable body 600 further includes a protective outer layer 640. The protective outer layer 640 is disposed outside the shielding housing 630 and is made of PEEK material, having good heat resistance, wear resistance and corrosion resistance. The protective outer layer 640 surrounds and protects the internal structure of the cable body 600, preventing damage such as wear and corrosion caused by long-term exposure of the internal components of the cable body 600.

[0030] As Figure 1 shown, in some embodiments, the nuclear power plant cable assembly of the present application further includes two brazing fixing pipes 300. The two brazing fixing pipes 300 are disposed on the cable body 600, and the two brazing fixing pipes 300 are respectively located at the welding joints of the cable body 600 with the first connector and the cable body 600 with the second connector. The cable body 600 is welded to the first connector and the second connector through the brazing fixing pipes 300, which can make the welding more firm and reliable, ensuring the integrity of the finished nuclear power plant cable assembly.

[0031] As Figure 1 shown, in some embodiments, the nuclear power plant cable assembly of the present application further includes a first heat shrinkable sleeve 400. The first heat shrinkable sleeve 400 is sleeved outside the cable body 600, and the first heat shrinkable sleeve 400 covers the welding joints of the cable body 600 with the first connector and the cable body 600 with the second connector. The brazing fixing pipe 300 is located inside the first heat shrinkable sleeve 400. The welding joints are covered and protected by the first heat shrinkable sleeve 400, protecting the internal structure of the nuclear power plant cable assembly and increasing the compressive strength and durability of the nuclear power plant cable assembly.

[0032] As Figure 1 shown, in some embodiments, the nuclear power plant cable assembly of the present application further includes a second heat shrinkable sleeve 500. The second heat shrinkable sleeve 500 is sleeved outside the cable body 600, and at least part of the second heat shrinkable sleeve 500 overlaps with the first heat shrinkable sleeve 400. Through the second heat shrinkable sleeve 500, the cable body 600 is further protected, and at the same time, the sealing performance of the first heat shrinkable sleeve 400 for the welding joints is improved, more effectively preventing water from entering the cable from the welding joints.

[0033] As Figure 2 shown, in some embodiments, the male plug 100 includes a welding pipe 130, a lead pipe 110 and an insulating member 120 for separating the welding pipe 130 and the lead pipe 110. The lead pipe 110 is electrically connected to the core wire 610, and the welding pipe 130 is used for welding connection with the explosive welding joint 200.

[0034] As Figure 1As shown, in some embodiments, the second connector further includes a silicone rubber pad 710 and a connector protection cap 720. Among them, the connector protection cap 720 is installed behind the coaxial connector 700, and the silicone rubber pad 710 is located between the connector protection cap 720 and the coaxial connector 700.

[0035] In some embodiments, the explosive welding head 200 includes a first end and a second end arranged opposite to each other. The first end is used to connect to the welded pipe 130, and the second end is used to connect to the brazing fixed pipe 300. Among them, the materials of the first end and the second end are different. The first end and the second end of the explosive welding head 200 are tightly combined together by explosive welding. In addition, the material of the first end is the same as that of the welded pipe 130, and the material of the second end is the same as that of the brazing fixed pipe 300. Through the explosive welding head 200, the welding between the cable body and the explosive welding head 200, and between the male plug 100 and the explosive welding head 200 are all weldings of the same metal. Furthermore, laser welding and argon arc welding can be combined for welding, so that the nuclear power plant cable assembly can fully meet the sealing requirements.

[0036] This application also provides a manufacturing process for the above-mentioned nuclear power plant cable assembly, including the following steps:

[0037] S1. Dock and install the welded pipe 130 of the male plug 100 with the first end of the explosive welding head 200, and fasten it by welding to obtain the first connector.

[0038] S2. Determine the length of the cable body 600 according to the set depth of the fission chamber detector, and cut the cable body 600 to obtain the corresponding length of the cable body 600.

[0039] S3. Straighten the cable body 600, and use an ultrasonic wire stripper to strip the insulating layer 620 and the shielding outer shell 630 of the cable body 600 near both ends until the core wire 610 is exposed by 40 - 60 mm, and polish the surface oxide layer of the exposed core wire 610.

[0040] S4. Fix two brazing fixed pipes 300 at both ends of the cable body 600, put one end of the explosive welding head 200 of the first connector onto one end of the cable body 600, and make the core wire 610 electrically connected to the male plug 100, where one brazing fixed pipe 300 is in contact with the explosive welding head 200; put the second connector onto the other end of the cable body 600, make the inner conductor electrically connected to the core wire 610, and the other brazing fixed pipe 300 is in contact with the second connector.

[0041] S5. Weld and fix the brazing fixed pipe 300 to the corresponding contacting explosive welding head 200 and the second connector respectively, so that the first connector and the second connector are fixed at both ends of the cable body 600 to obtain the nuclear power plant cable assembly.

[0042] The present application provides a manufacturing process for a nuclear power plant cable assembly. By adopting the above manufacturing process, the manufacturing process is simplified, the manufacturing efficiency is improved, and the time and labor intensity of manual operation are reduced.

[0043] Further, in the above step S1, before welding, clean the welding joint of the welding pipe 130 and the explosive welding joint 200 with a dust-free paper dipped in alcohol to ensure the welding effect. In addition, in the above step S1, the welding method is continuous welding. After welding, it is handed over to the inspector for leak detection after welding, and the leakage rate is required to be ≤ 10-12 Pa·m3 / s to ensure that the sealing performance of the nuclear power plant cable assembly meets the requirements.

[0044] Further, in the above step S2, during cutting, the cutting length of the cable body 600 should be slightly longer than the set depth of the fission chamber detector to compensate for the part of the cable body 600 that needs to be removed during processing. In addition, in the above step S2, after the cutting of the cable body 600 is completed, use a heating hot melt gun to heat both ends of the cut cable body 600 to achieve temporary sealing.

[0045] Further, in the above step S3, when using an ultrasonic wire stripper to strip the cable body 600, it is necessary to pay attention that the core wire 610 does not contact the shielding shell 630.

[0046] Further, in the above step S4, insulating ceramic tube sleeves are respectively provided between the first connector and the cable body 600 and between the second connector and the cable body 600. During assembly, first put the ceramic tube sleeve on the core wire 610, and then respectively put on the first connector and the second connector.

[0047] Further, in the above step S5, the brazing fixing tube 300 is welded and fixed to the explosive welding joint 200 and the second connector by at least one of laser welding and high-frequency induction welding. In this manufacturing process, laser welding and high-frequency induction brazing technologies are adopted to make the welding parts of the first connector and the cable body 600 and the second connector and the cable body 600 more firm and reliable, improving the stability and reliability of the nuclear power plant cable assembly.

[0048] Further, it also includes step S6, welding and fixing the lead-out pipe on the nuclear power plant cable assembly: first, the lead-out pipe is sleeved on the nuclear power plant cable assembly; before welding the lead-out pipe, use a 150°C hot air gun to dry the lead-out pipe for 2 minutes; then the nuclear power plant cable assembly is inserted into a rotatable device and fixed; the lead-out pipe and the nuclear power plant cable assembly are welded together by laser welding; finally, the nuclear power plant cable assembly welded with the lead-out pipe is subjected to a water immersion test. The water immersion test includes three specific operations: a small water immersion test, a medium water immersion test, and a large water immersion test. First, the first connector of the nuclear power plant cable assembly is adapted and connected to the fission chamber detector, and then the lead-out pipe part is placed in deionized water for a small water immersion test; the component part of the first connector is placed in deionized water for a medium water immersion test; the part of the components of the first connector and the second connector are immersed in deionized water for a large water immersion test, wherein it is necessary to ensure that the weld is completely immersed in water. If the insulation resistance of the cable body 600 is significantly reduced, it may be a weld leak, which needs to be checked. Through the water immersion test, the sealing performance of the nuclear power plant cable assemblies in a humid environment is ensured, thereby improving the durability and reliability of the nuclear power plant cable assemblies.

[0049] Furthermore, the method further includes step S7, sealing the connector on the nuclear power plant cable assembly, specifically fixing the tail wing on the nuclear power plant cable assembly by high-frequency induction welding, and after completion, heating the first heat shrink tubing and the second heat shrink tubing to shrink them.

[0050] It can be understood that the above embodiments only express the preferred implementation methods of the present application, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present application; it should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present application; therefore, all equivalent changes and modifications made to the scope of the claims of the present application should fall within the scope of the claims of the present application.

Claims

1. A nuclear power plant cable assembly for adapting to a fission chamber detector, characterized in that, Comprising: A cable body, the cable body includes a core wire, an insulating layer, and a shielding outer shell arranged in sequence from inside to outside. The shielding outer shell is arranged outside the core wire to shield external electromagnetic interference, and the insulating layer separates the core wire and the shielding outer shell; A first connector, the first connector is arranged at one end of the cable body for connecting the fission chamber detector. The first connector includes a male plug and an explosive welding head. The male plug is welded to the cable body through the explosive welding head, and the male plug is electrically connected to the core wire; A second connector, the second connector is arranged at the end of the cable body away from the first connector, and the second connector is welded to the cable body; the second connector includes a coaxial connector, and an inner conductor is arranged inside the coaxial connector, and the inner conductor is electrically connected to the core wire.

2. The nuclear power plant cable assembly according to claim 1, characterized in that The cable body further includes a protective outer layer, and the protective outer layer is arranged outside the shielding outer shell.

3. The nuclear power plant cable assembly according to claim 1 or 2, characterized in that, It further includes two brazing fixing pipes. The two brazing fixing pipes are arranged on the cable body, and the two brazing fixing pipes are respectively located at the welding joints of the cable body and the first connector, and the cable body and the second connector.

4. The nuclear power plant cable assembly according to claim 3, wherein, It further includes a first heat shrinkable sleeve. The first heat shrinkable sleeve is sleeved outside the cable body. The first heat shrinkable sleeve covers the welding joints of the cable body and the first connector, and the cable body and the second connector. The brazing fixing pipe is located inside the first heat shrinkable sleeve.

5. The nuclear power plant cable assembly according to claim 4, wherein It further includes a second heat shrinkable sleeve. The second heat shrinkable sleeve is sleeved outside the cable body, and at least part of the second heat shrinkable sleeve overlaps with the first heat shrinkable sleeve.

6. The nuclear power plant cable assembly according to claim 3, characterized in that, The male plug includes a welding pipe, a lead pipe, and an insulating part for separating the welding pipe and the lead pipe. The lead pipe is electrically connected to the core wire.

7. A manufacturing process for the nuclear power plant cable assembly according to any one of claims 1 to 6, characterized in that, Including the following steps: S1. Dock and install the welding pipe of the male plug with the first end of the explosive welding head, and fasten it by welding to obtain the first connector; S2. Determine the length of the cable body according to the installation depth of the fission chamber detector, and cut the cable body to obtain the cable body with the corresponding length; S3. Straighten the cable body, and use an ultrasonic wire stripper to strip the insulating layer and the shielding outer shell of the cable body near both ends until the core wire is exposed by 40 - 60 mm, and polish the surface oxide layer of the exposed core wire; S4. Fix the two brazing fixing pipes at both ends of the cable body. Sleeve the explosive welding head end of the first connector onto one end of the cable body, and electrically connect the core wire to the male plug, where one of the brazing fixing pipes is in contact with the explosive welding head; sleeve the second connector onto the other end of the cable body, and electrically connect the inner conductor to the core wire, and the other brazing fixing pipe is in contact with the second connector; S5. Weld and fix the brazing fixed pipe to the corresponding explosion welding joint and the second connector in contact respectively, so that the first connector and the second connector are fixed at both ends of the cable body to obtain a nuclear power plant cable assembly.

8. The manufacturing process according to claim 7, characterized in that, In the above step S5, the brazing fixed pipe is welded and fixed to the explosion welding joint and the second connector by at least one of laser welding and high-frequency induction welding.

9. The manufacturing process according to claim 7 or 8, characterized in that, It further includes step S6 of welding and fixing an outlet pipe on the nuclear power plant cable assembly: First, sleeved the outlet pipe on the nuclear power plant cable assembly; Before welding the outlet pipe, dry the outlet pipe with a hot air gun at 150 °C for 2 minutes; Then, insert the nuclear power plant cable assembly into a rotatable device for fixing; Use laser welding to weld the outlet pipe and the nuclear power plant cable assembly together; Finally, conduct a water immersion test on the nuclear power plant cable assembly welded with the outlet pipe.

10. The manufacturing process according to claim 9, characterized in that, It further includes step S7 of sealing a connector on the nuclear power plant cable assembly.

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