Nuclear power plant primary loop low-voltage instrument control cable penetrating device and manufacturing method thereof

Abstract

The invention relates to the technical field of low-voltage electrics. According to the nuclear power plant primary loop low-voltage instrument control cable penetrating device and the manufacturing method thereof, a first low-voltage conductor and a flange cover are sealed through first sintered glass, and a second low-voltage conductor and a flange are sealed through second sintered glass; in the sealing process, the first low-voltage conductor, the first sintered glass and the flange cover adopt a sealing process which is completed by one step through metal pre-oxidation and sintering, and the second low-voltage conductor, the second sintered glass and the flange adopt a sealing process which is completed by one step through metal pre-oxidation and sintering; the first low-voltage conductor and the second low-voltage conductor are coaxially connected. According to the invention, a sealing process which is completed by one step through metal pre-oxidation and sintering is adopted, so that the influence of accelerated aging of a sealing material caused by high temperature, high pressure and high irradiation is reduced, the sealing performance and mechanical strength of the penetration piece are ensured, and the reliability and safety of the penetration piece used under a high-pressure condition for a long time are ensured.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical technology, and in particular to a device for penetrating low-voltage instrumentation and control cables in the primary loop of a nuclear power plant and its manufacturing method. Background Technology

[0002] Currently, with the development of new nuclear energy technologies, the outlet temperature and pressure of various non-pressurized water reactor types (such as gas-cooled reactors and supercritical carbon dioxide reactors) are constantly increasing, resulting in more severe operating environment conditions and requiring the supporting equipment and devices to have strong environmental adaptability and reliability.

[0003] Currently, electrical penetrations utilize organic materials for sealing. For example, the patent "Low-Pressure Electrical Penetration Device for Reactor Containment" (publication number ZL200620137310.9) uses polymeric organic materials for conductor sealing and electrical insulation. While it exhibits certain sealing performance and mechanical strength under existing pressurized water reactor conditions, it suffers from material aging issues under high temperature and high radiation conditions. Therefore, there is a need to find an electrical penetration device suitable for high-temperature, high-pressure, and high-radiation environments. Summary of the Invention

[0004] In view of this, the present invention provides a device for penetrating the low-voltage instrumentation and control cable of the primary loop of a nuclear power plant and a method for manufacturing the same.

[0005] Specifically, the following technical solutions are included: In a first aspect, this application provides a device for penetrating the low-voltage instrumentation and control cable of the primary loop in a nuclear power plant, comprising: Flange, flange cover, first low-voltage conductor, second low-voltage conductor; The flange and the flange cover are detachably connected. The first low-voltage conductor and the flange cover are sealed together by a first sintered glass, and the second low-voltage conductor and the flange are sealed together by a second sintered glass. During the sealing process, the first low-voltage conductor, the first sintered glass, and the flange cover are sealed together by a one-step metal pre-oxidation and sintering process. The second low-voltage conductor, the second sintered glass, and the flange are sealed together by a one-step metal pre-oxidation and sintering process. The first low-voltage conductor and the second low-voltage conductor are coaxially connected.

[0006] Preferably, both the flange and the flange cover are provided with sintering channels; The wall surface of the sintering channel that contacts the sintered glass is configured as a multi-curved surface or a conical surface.

[0007] Preferably, the device further includes a dual-head connector; The double-ended connector is disposed in the flange cover, with the first low-voltage conductor connected to one end of the double-ended connector and the second low-voltage conductor connected to the other end of the double-ended connector.

[0008] Preferably, the device further includes insulating components and a double-ended connector; The insulating component is disposed inside the flange cover, the double-ended connector is disposed in the insulating component, and one side of the insulating component abuts against the flange; The insulating components are made of polysulfone, epoxy resin, silicone rubber, or polyetheretherketone.

[0009] Preferably, the device further includes insulating adhesive; The insulating adhesive is filled between the flange cover, the first low-voltage conductor, and the first sintered glass, and the insulating adhesive is also filled between the flange, the second low-voltage conductor, and the second sintered glass.

[0010] Preferably, the device further includes a first pressure plate and a second pressure plate; The first end face and the second end face of the flange cover are disposed opposite to each other, and the first end face and the second end face of the flange are disposed opposite to each other; The first end face of the flange cover abuts against the first end face of the flange, the first pressure plate abuts against the second end face of the flange cover, the insulating adhesive filled in the flange cover abuts against the first pressure plate, the second pressure plate abuts against the second end face of the flange, and the insulating adhesive filled in the flange abuts against the second pressure plate.

[0011] Preferably, the device further includes an external connector; Multiple first low-voltage conductors are provided, and multiple first low-voltage conductors are connected to one external connector; Multiple second low-voltage conductors are provided, and multiple second low-voltage conductors are connected to another external connector.

[0012] Secondly, this application provides a method for manufacturing a primary loop low-voltage instrumentation and control cable penetration device for a nuclear power plant, used to manufacture the primary loop low-voltage instrumentation and control cable penetration device for a nuclear power plant as described in the first aspect, the manufacturing method comprising: The first low-voltage conductor and flange cover are assembled with the first sintered glass and sintered using a one-step sealing process of metal pre-oxidation and sintering to form the first sintered structural component. The second low-voltage conductor and flange are assembled with the second sintered glass and sintered using a one-step sealing process of metal pre-oxidation and sintering to form the second sintered structural component. The surface oxides of the first and second sintered structural components are removed and electroplated or chemically plated with nickel or chromium. Liquid insulating adhesive is filled into the sintering channels of the first and second sintered structural components and cured at room temperature or high temperature. Install the second end of the double-ended connector to the first end of the first low-voltage conductor, and install the insulating component to the first end of the double-ended connector; A sealing structure is installed on the flange cover of the first sintered structural component; The second sintered structural component is fastened to the first sintered structural component using fasteners; Install external connectors on multiple first low-voltage conductors, install another external connector on multiple second low-voltage conductors, install the first protective box to the flange cover, and install the second protective box to the flange.

[0013] Preferably, the sintering process, which involves a one-step sealing process of metal pre-oxidation and sintering, includes: Based on a pre-set temperature gradient, the metal pre-oxidation process and sintering process are completed in one step in the heating furnace under a reducing atmosphere.

[0014] The beneficial effects of the technical solution provided by this invention include at least the following: This invention uses a first sintered glass to perform glass-metal sintering sealing of the first low-voltage conductor and the flange cover, and a second sintered glass to perform glass-metal sintering sealing of the second low-voltage conductor and the flange. It adopts a sealing process that completes the metal pre-oxidation and sintering in one step, which realizes the sealing between the first low-voltage conductor and the flange cover, and between the second low-voltage conductor and the flange. This reduces the impact of high temperature, high pressure, and high radiation on the accelerated aging of the sealing material, ensures the sealing performance and mechanical strength of the penetrating component, and ensures the reliability and safety of the penetrating component under long-term high-pressure conditions. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a through-hole device structure according to an embodiment of the present invention; Figure 2 This is a schematic cross-sectional view of a through-hole device according to an embodiment of the present invention. Figure 2 Figure A shows a schematic diagram of a multi-surface structure. Figure 2 Figure B in the diagram is a schematic diagram of a conical surface structure; Figure 3 This is a schematic diagram of a penetration device for removing the first protective box and the second protective box according to an embodiment of the present invention; Figure 4This is a schematic diagram of a through-hole device for removing external connectors according to an embodiment of the present invention.

[0017] The reference numerals in the figure are respectively: 101-First protective box; 102-Second protective box; 201-First low-voltage conductor; 202-Second low-voltage conductor; 301-First pressure plate; 302-Second pressure plate; 401-First sintered glass; 402-Second sintered glass; 5-Flange cover; 6-Fastener; 7-Lifting ring; 8-Double-ended connector; 9-Sealing structure; 10-Flange; 11-Insulating component; 12-Insulating adhesive; 13-External connector.

[0018] The accompanying drawings have illustrated specific embodiments of the invention, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Before providing a further detailed description of the embodiments of the present invention, the directional terms used in the embodiments of the present invention, such as "upper part," "lower part," and "side part," are used to refer to... Figure 1 The orientation shown is a reference and does not limit the scope of protection of this invention.

[0021] To make the technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0022] like Figure 1 , Figure 2As shown, this application provides a low-voltage instrumentation and control cable penetration device for the primary loop of a nuclear power plant, comprising: a flange 10, a flange cover 5, a first low-voltage conductor 201, and a second low-voltage conductor 202; the flange 10 and the flange cover 5 are detachably connected, and the first low-voltage conductor 201 and the flange cover 5 are sealed together by a first sintered glass 401. Specifically, after the first low-voltage conductor 201, the flange cover 5, and the first sintered glass 401 are assembled and supported using a graphite mold, they are heated in a reducing atmosphere. During the sealing process, the first low-voltage conductor 201, the first sintered glass 401, and the flange cover 5 are sealed using a one-step sealing process that combines metal pre-oxidation and sintering. The second low-voltage conductor 202 and the flange 10 are sealed together by the second sintered glass 402. Specifically, after the second low-voltage conductor 202, the flange 10, and the second sintered glass 402 are assembled and supported using a graphite mold, they are heated in a reducing atmosphere. During the sealing process, the second low-voltage conductor 202, the second sintered glass 402, and the flange 10 are sealed using a one-step sintering process involving metal pre-oxidation and sintering. The first low-voltage conductor 201 and the second low-voltage conductor 202 are coaxially connected. This application uses a first sintered glass 401 to perform glass-metal sintering sealing of the first low-voltage conductor 201 and the flange cover 5, and a second sintered glass 402 to perform glass-metal sintering sealing of the second low-voltage conductor 202 and the flange 10. By adopting a sealing process that completes the metal pre-oxidation and sintering in one step, the sealing of the first low-voltage conductor 201 and the flange cover 5, and the second low-voltage conductor 202 and the flange 10 are achieved. This reduces the impact of high temperature, high pressure, and high radiation on the accelerated aging of the sealing material, and ensures the sealing performance and mechanical strength of the penetrating parts.

[0023] Preferred, such as Figure 2 As shown in the enlarged section, sintering channels are provided on both flange 10 and flange cover 5. The wall surface of the sintering channel in contact with the sintered glass is designed as a multi-curved surface or a conical surface, which not only enables pre-oxidation and sintering to be completed in one step, but also significantly enhances the overall pressure-bearing capacity (not less than 20MPa). A multi-curved surface refers to the wall surface of the sintering channel in contact with the sintered glass including multiple concave and convex surfaces, which are continuously and alternately arranged along the axial direction of the sintering channel, such as... Figure 2 As shown in Figure A, the conical surface refers to the conical shape of the wall surface of the sintered channel that contacts the sintered glass along the axial direction of the sintered channel. In other words, the cross-sectional area of ​​the sintered channel in contact with the sintered glass changes linearly along the axial direction of the sintered channel, as shown in Figure A. Figure 2 As shown in Figure B.

[0024] Specifically, during the heating process, because the wall surface in contact with the sintered glass within the sintering channel is designed as a multi-curved or conical surface, an air gap exists between the glass and the wall surface of the sintering channel. During sintering, the inner wall of the sintering channel is first oxidized. During the oxidation process, as heating continues to the glass melting temperature, the glass gradually melts into molten glass. The molten glass naturally fills the previously existing air gap and wets the oxidized metal, forming a pressure-bearing and sealed interface. Finally, it is sintered into a single unit, realizing the one-step completion of the metal pre-oxidation process and the sintering process, simplifying the sintering steps. Moreover, because the contact surface between the glass and the sintering channel becomes a multi-curved or conical surface after sintering, the overall pressure-bearing capacity after sintering is significantly enhanced (not less than 20MPa), ensuring the reliability and safety of the penetrating component under long-term high-pressure conditions.

[0025] Preferably, flange 10 and flange cover 5 are made of metal materials such as carbon steel, stainless steel or titanium alloy, and the coefficient of thermal expansion of flange 10 and flange cover 5 is higher than or equal to the coefficient of thermal expansion of glass or expansion alloy.

[0026] Preferably, after sintering, the flange cover 5 and flange 10 need to have their surface oxides removed and be electroplated or chemically plated with nickel or chromium. After sintering, the first low-voltage conductor 201 and the second low-voltage conductor 202 need to have their surface oxides removed and their exposed surfaces treated with nickel, gold, or other plating layers to enhance wear resistance and conductivity.

[0027] Preferably, the first low-voltage conductor 201 and the second low-voltage conductor 202 are made of an expansion alloy, and more preferably, the first low-voltage conductor 201 and the second low-voltage conductor 202 are made of an iron-nickel alloy. The expansion coefficients of the first low-voltage conductor 201 and the second low-voltage conductor 202 are basically consistent with the expansion coefficient of glass, allowing them to be sintered together with the flange cover 5 and the flange 10 to achieve pressure bearing and sealing functions, ensuring the operability of glass sintering and sealing from a process perspective. Although the expansion alloy has low conductivity, it generates less heat when carrying small currents, so it can be used in the low-pressure instrumentation and control through-system of the primary loop in nuclear power plants.

[0028] Preferably, the device further includes a double-ended connector 8, which is disposed in the flange cover 5. The first low-voltage conductor 201 is connected to one end of the double-ended connector 8, and the second low-voltage conductor 202 is connected to the other end of the double-ended connector 8. The connection method between the first low-voltage conductor 201, the second low-voltage conductor 202 and the double-ended connector 8 is crimping or plugging, ensuring the electrical continuity of the first low-voltage conductor 201 and the second low-voltage conductor 202.

[0029] Preferably, the device further includes an insulating component 11 and insulating adhesive 12. The insulating component 11 is disposed within the flange cover 5, and the double-ended connector 8 is disposed within the insulating component 11, with one side of the insulating component 11 abutting against the flange 10. The insulating component 11 is made of polysulfone, epoxy resin, silicone rubber, or polyetheretherketone. The double-ended connector 8 is installed within the reserved space of the insulating component 11, and the insulating component 11 is used for fixing the double-ended connector 8 and for electrical insulation of the internal space.

[0030] Insulating adhesive 12 is filled between flange cover 5, the first low-voltage conductor 201, and the first sintered glass 401. Insulating adhesive 12 is also filled between flange 10, the second low-voltage conductor 202, and the second sintered glass 402. Both flange cover 5 and flange 10 are provided with sintering channels. The first low-voltage conductor 201 is disposed in the sintering channel on flange cover 5, the second low-voltage conductor 202 is disposed in the sintering channel on flange 10, the first sintered glass 401 and the second sintered glass 402 are disposed in the sintering channels, and the insulating adhesive 12 is disposed in the sintering channels.

[0031] The insulating adhesive 12 is filled into the corresponding positions in its liquid state and then cured at room temperature or high temperature. This completely eliminates air within the sintered channels, ensuring continuous insulation along the entire length of the first low-voltage conductor 201 and the second low-voltage conductor 202, enhancing creepage distance, and guaranteeing the voltage withstand requirements of the entire through-hole device. The insulating adhesive 12 fills the space within the sintered channels excluding the sintered glass, the first low-voltage conductor 201, and the second low-voltage conductor 202, isolating it from the air atmosphere, ensuring continuous insulation, and enhancing the electrical insulation performance of the equipment.

[0032] Preferably, multiple first low-voltage conductors 201 and multiple second low-voltage conductors 202 are provided, with each first low-voltage conductor 201 and second low-voltage conductor 202 corresponding to the other. At least three first low-voltage conductors 201 and three second low-voltage conductors 202 are provided. In this embodiment, nine first low-voltage conductors 201 and nine second low-voltage conductors 202 are provided. The diameters of the multiple first low-voltage conductors 201 and the multiple second low-voltage conductors 202 are the same or different. The corresponding first low-voltage conductors 201 and second low-voltage conductors 202 have the same diameter. This enables the transmission of low-voltage, low-current power, nuclear power plant primary loop low-voltage instruments, and low-voltage control power and signals.

[0033] Preferred, such as Figure 3 , Figure 4As shown, the device also includes a first pressure plate 301 and a second pressure plate 302. The first end face and the second end face of the flange cover 5 are positioned opposite each other, as are the first end face and the second end face of the flange 10. The first end face of the flange cover 5 and the first end face of the flange 10 abut against each other, the first pressure plate 301 abuts against the second end face of the flange cover 5, the insulating adhesive 12 filled in the flange cover 5 abuts against the first pressure plate 301, and the second pressure plate 302 abuts against the second end face of the flange 10. The insulating adhesive 12 filled in the flange 10 abuts against the second pressure plate 302. The first pressure plate 301 is bolted to the second end face of the flange cover 5, pressing the insulating adhesive 12 firmly. The second pressure plate 302 is bolted to the second end face of the flange 10, pressing the insulating adhesive 12 firmly. The first pressure plate 301 and the second pressure plate 302 are used to prevent the insulating adhesive 12 from bulging or falling off during long-term use, ensuring the electrical performance of the equipment. Additionally, conductor numbers can be etched onto the pressure plate to facilitate on-site identification of wiring.

[0034] Preferably, both the first pressure plate 301 and the second pressure plate 302 are made of polysulfone, epoxy resin, silicone rubber, or polyetheretherketone.

[0035] Preferably, the free ends of the first low-voltage conductor 201 and the second low-voltage conductor 202 are both cylindrical structures, connected to an external cable via an elastic element. The first low-voltage conductor 201 and the second low-voltage conductor 202 are connected to the external cable using terminals or crimping kits.

[0036] Preferably, the device further includes a sealing structure 9, with two axial sealing structures 9 provided between the flange cover 5 and the flange 10 to improve the sealing performance of the flange cover 5 and the flange 10. The sealing structure 9 can be a gasket or a sealing ring.

[0037] Flange cover 5 and flange 10 are connected by fastener 6. The detachable structure makes it easy to replace the sealing structure 9, insulating component 11, first low-voltage conductor 201, and second low-voltage conductor 202 without replacing the entire through-hole device, which greatly facilitates the project and reduces losses. Fastener 6 is a bolt.

[0038] The flange cover 5 has a through hole on its side that connects to the inside and outside, linking the air chamber between the flange 10 and the flange cover 5 to the outside. A pipe interface is provided at the through hole for connecting a pressure monitoring device. The internal space of the flange 10 and the flange cover 5 forms an air chamber. After being filled with gas at a certain pressure, the overall leakage rate of the glass sintering structure and the sealing ring can be monitored based on changes in gas pressure.

[0039] The flange cover 5 is also equipped with a lifting ring 7 for transporting and hoisting the through device.

[0040] like Figure 2 , Figure 3As shown, the device also includes an external connector 13, a first protective box 101, and a second protective box 102. Two external connectors 13 are provided, and multiple first low-voltage conductors 201 are provided, connected to one external connector 13; multiple second low-voltage conductors 202 are provided, connected to another external connector 13. By connecting multiple first low-voltage conductors 201 and multiple second low-voltage conductors 202 as a whole through the external connectors 13 located at the ends, rapid connection to subsequent cables can be achieved. Furthermore, the external connector 13 is composed of at least insulating material and conductive metal components.

[0041] Specifically, after the two external connectors 13 are fully inserted into their respective positions with the first low-voltage conductor 201 and the second low-voltage conductor 202, the first protective box 101 is bolted to the flange cover 5, and the second protective box 102 is bolted to the flange 10. The installation of the first protective box 101 and the second protective box 102 effectively isolates dust, impurities, etc. from the environment, and provides protection for the internal insulating components 11, insulating adhesive 12, pressure plate, conductors, etc. The connection point between the end of the first low-voltage conductor 201 and the external cable is located inside the first protective box 101, and the connection point between the end of the second low-voltage conductor 202 and the external cable is located inside the second protective box 102.

[0042] Under normal and accident operating conditions, the low-pressure instrumentation and control cable penetration device for the primary loop of nuclear power plants proposed in this application can ensure the integrity of the pressure boundary and prevent the leakage of radioactive materials. It can be used for the penetration of instrumentation and control cables in nuclear facilities, new gas-cooled reactors, ultracarbon reactors and other fields.

[0043] This application enables instrumentation cables to penetrate pressure boundaries under high temperature, high pressure, and radiation conditions, providing power to equipment inside the pressure boundary. A glass-metal sintering process is used to seal the first low-voltage conductor 201 to the flange cover 5 and the second low-voltage conductor 202 to the flange 10, reducing the impact of accelerated aging of the sealing material caused by high temperature and radiation, and ensuring the reliability and safety of the equipment under long-term high-pressure conditions. The first low-voltage conductor 201 and the second low-voltage conductor 202 are expansion alloys (containing iron-nickel alloys) with expansion coefficients matching glass, ensuring the operability of the glass sintering seal from a technological perspective. The penetration device is equipped with two axial sealing structures 9, enabling continuous monitoring of multiple sealing points (flange 10 seal, flange cover 5 seal, and sintered channel seal). The overall equipment adopts detachable connections, facilitating installation, maintenance, and replacement.

[0044] This embodiment also provides a method for manufacturing a low-voltage instrumentation and control cable penetration device for the primary loop of a nuclear power plant, including: Step 1: Assemble the first low-voltage conductor 201 and flange cover 5 with the first sintered glass 401, and sinter them using a one-step sealing process of metal pre-oxidation and sintering to form the first sintered structural component. Assemble the second low-voltage conductor 202 and flange 10 with the second sintered glass 402, and sinter them using a one-step sealing process of metal pre-oxidation and sintering to form the second sintered structural component. Remove the surface oxides from the first and second sintered structural components and electroplate or chemically plate them with nickel or chromium.

[0045] Specifically, the sintering process using a one-step sealing process that combines metal pre-oxidation and sintering includes: based on a pre-set temperature gradient, the metal pre-oxidation process and the sintering process are completed in one step in a heating furnace under a reducing atmosphere.

[0046] Specifically, after the first low-voltage conductor 201, flange cover 5, and first sintered glass 401 are assembled and supported using a graphite mold, they are heated in a reducing atmosphere to complete one-step sintering. During this heating process, because the wall surface in contact with the sintered glass inside the sintering channel is designed with multiple curved or conical surfaces, an air gap exists between the glass and the sintering channel. During sintering, based on a pre-set temperature gradient, the inner wall of the sintering channel of flange cover 5 is first oxidized, and then heated to the glass melting temperature. The molten glass naturally fills the air gap between the glass and the sintering channel and wets the oxidized metal, forming a pressure-bearing and sealing interface. Finally, the metal pre-oxidation process and the sintering process are completed in one step, forming the first sintered structural component.

[0047] Specifically, after the second low-voltage conductor 202, flange 10, and second sintered glass 402 are assembled and supported using a graphite mold, they are heated in a reducing atmosphere to complete one-step sintering. During this heating process, because the wall surface in contact with the sintered glass inside the sintering channel is designed with multiple curved or conical surfaces, an air gap exists between the glass and the sintering channel. During sintering, based on a pre-set temperature gradient, the inner wall of the sintering channel of flange 10 is first oxidized, and then heated to the glass melting temperature. The molten glass naturally fills the air gap between the glass and the sintering channel and wets the oxidized metal, forming a pressure-bearing and sealing interface. Finally, the metal pre-oxidation process and the sintering process are completed in one step to form the second sintered structural component.

[0048] Specifically, the sealing process of the first sintered structural component and the second sintered structural component is carried out simultaneously.

[0049] Specifically, the surface oxides of the first and second sintered structural components are removed and electroplated or chemically plated with nickel or chromium. This includes: after sintering, the surface oxides of the flange cover 5 and flange 10 need to be removed and electroplated or chemically plated with nickel or chromium; after sintering, the surface oxides of the first low-voltage conductor 201 and the second low-voltage conductor 202 need to be removed and the exposed surfaces treated with nickel, gold, or other plating layers to enhance wear resistance and conductivity.

[0050] Step 2: Fill the sintering channels of the first and second sintered structural components with liquid insulating adhesive 12, and cure at room temperature or high temperature. Specifically, liquid insulating adhesive 12 is filled into the sintering channels between the flange cover 5, the first low-voltage conductor 201, and the first sintered glass 401, and into the sintering channels between the flange 10, the second low-voltage conductor 202, and the second sintered glass 402. After curing at room temperature or high temperature, the air inside the sintering channels is removed. The insulating adhesive 12 fills the space within the sintering channels, excluding the sintered glass, the first low-voltage conductor 201, and the second low-voltage conductor 202, isolating the air atmosphere, ensuring continuous insulation, and enhancing the electrical insulation performance of the equipment.

[0051] Step 3: Install the second end of the double-ended connector 8 to the first end of the first low-voltage conductor 201, and install the insulating component 11 to the first end of the double-ended connector 8; Specifically, such as Figure 1 As shown, the first end of the double-ended connector 8 is the right end of the double-ended connector 8, the second end of the double-ended connector 8 is the left end of the double-ended connector 8, the first end of the first low-voltage conductor 201 is the right end of the first low-voltage conductor 201, and a countersunk hole is provided on the flange cover 5, which is recessed away from the flange 10. The left end of the double-ended connector 8 is installed into the right end of the first low-voltage conductor 201 within the countersunk hole, and then the insulating component 11 is installed into the countersunk hole of the flange cover 5. The insulating component 11 has a insertion channel, and the first end of the double-ended connector 8 is inserted into the left end of the insertion channel.

[0052] Step 4: Install the sealing structure 9 on the flange cover 5 of the first sintered structural component; Specifically, the flange cover 5 is provided with a sealing groove, and the sealing structure 9 is installed into the sealing groove of the flange cover 5.

[0053] Step 5: Secure the second sintered structural component to the flange cover 5 of the first sintered structural component using fasteners 6; Specifically, the sintered and processed second sintered structural component is locked to the flange cover 5 using fasteners 6.

[0054] Step 6: Install the first pressure plate 301 on the flange cover 5 and the second pressure plate 302 on the flange 10; Specifically, a first pressure plate 301 is installed on the second end face of the flange cover 5, and a second pressure plate 302 is installed on the second end face of the flange 10. The first pressure plate 301 is bolted to the second end face of the flange cover 5, and the first pressure plate 301 presses against the insulating adhesive 12. The second pressure plate 302 is bolted to the second end face of the flange 10, and the second pressure plate 302 presses against the insulating adhesive 12. The first pressure plate 301 and the second pressure plate 302 are used to prevent the insulating adhesive 12 from bulging or falling off during long-term use, thus ensuring the electrical performance of the equipment.

[0055] Step 7: Install external connectors 13 on multiple first low-voltage conductors 201, install another external connector 13 on multiple second low-voltage conductors 202, install the first protective box 101 to the flange cover 5, and install the second protective box 102 to the flange 10.

[0056] Specifically, the first protective box 101 is bolted to the flange cover 5, and the second protective box 102 is bolted to the flange 10. The installation of the first protective box 101 and the second protective box 102 effectively isolates dust, impurities, etc. from the environment, and provides protection for the internal insulating components 11, insulating adhesive 12, pressure plate, conductors, etc. The connection point between the end of the first low-voltage conductor 201 and the external cable is located inside the first protective box 101, and the connection point between the end of the second low-voltage conductor 202 and the external cable is located inside the second protective box 102.

[0057] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "a plurality of" means two or more, unless otherwise expressly defined.

[0058] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0059] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for penetrating low-voltage instrumentation and control cables in the primary loop of a nuclear power plant, characterized in that, include: Flange, flange cover, first low-voltage conductor, second low-voltage conductor; The flange and the flange cover are detachably connected. The first low-voltage conductor and the flange cover are sealed together by a first sintered glass, and the second low-voltage conductor and the flange are sealed together by a second sintered glass. During the sealing process, the first low-voltage conductor, the first sintered glass, and the flange cover are sealed together by a one-step metal pre-oxidation and sintering process. The second low-voltage conductor, the second sintered glass, and the flange are sealed together by a one-step metal pre-oxidation and sintering process. The first low-voltage conductor and the second low-voltage conductor are coaxially connected.

2. The device for penetrating a low-voltage instrumentation and control cable in the primary loop of a nuclear power plant according to claim 1, characterized in that, Both the flange and the flange cover are provided with sintering channels; The wall surface of the sintering channel that contacts the sintered glass is configured as a multi-curved surface or a conical surface.

3. The device for penetrating the low-voltage instrumentation and control cable of the primary loop in a nuclear power plant according to claim 1, characterized in that, The device also includes a double-headed connector; The double-ended connector is disposed in the flange cover, with the first low-voltage conductor connected to one end of the double-ended connector and the second low-voltage conductor connected to the other end of the double-ended connector.

4. The device for penetrating the low-voltage instrumentation and control cable of the primary loop in a nuclear power plant according to claim 1, characterized in that, The device also includes insulating components and a double-ended connector; The insulating component is disposed inside the flange cover, the double-ended connector is disposed in the insulating component, and one side of the insulating component abuts against the flange; The insulating components are made of polysulfone, epoxy resin, silicone rubber, or polyetheretherketone.

5. A device for penetrating low-voltage instrumentation and control cables in the primary loop of a nuclear power plant according to claim 1, characterized in that, The device also includes insulating adhesive; The insulating adhesive is filled between the flange cover, the first low-voltage conductor, and the first sintered glass, and the insulating adhesive is also filled between the flange, the second low-voltage conductor, and the second sintered glass.

6. A device for penetrating low-voltage instrumentation and control cables in the primary loop of a nuclear power plant according to claim 1, characterized in that, The device also includes a first pressure plate and a second pressure plate; The first end face and the second end face of the flange cover are disposed opposite to each other, and the first end face and the second end face of the flange are disposed opposite to each other; The first end face of the flange cover abuts against the first end face of the flange, the first pressure plate abuts against the second end face of the flange cover, the insulating adhesive filled in the flange cover abuts against the first pressure plate, the second pressure plate abuts against the second end face of the flange, and the insulating adhesive filled in the flange abuts against the second pressure plate.

7. A device for penetrating low-voltage instrumentation and control cables in the primary loop of a nuclear power plant according to claim 1, characterized in that, The device also includes external connectors; Multiple first low-voltage conductors are provided, and multiple first low-voltage conductors are connected to one external connector; Multiple second low-voltage conductors are provided, and multiple second low-voltage conductors are connected to another external connector.

8. A method for manufacturing a low-voltage instrumentation and control cable penetration device for the primary loop of a nuclear power plant, characterized in that, The method for manufacturing a low-voltage instrumentation and control cable penetration device for the primary loop of a nuclear power plant as described in any one of claims 1 to 7 includes: The first low-voltage conductor and flange cover are assembled with the first sintered glass and sintered using a one-step sealing process of metal pre-oxidation and sintering to form the first sintered structural component. The second low-voltage conductor and flange are assembled with the second sintered glass and sintered using a one-step sealing process of metal pre-oxidation and sintering to form the second sintered structural component. The surface oxides of the first and second sintered structural components are removed and electroplated or chemically plated with nickel or chromium. Liquid insulating adhesive is filled into the sintering channels of the first and second sintered structural components and cured at room temperature or high temperature. Install the second end of the double-ended connector to the first end of the first low-voltage conductor, and install the insulating component to the first end of the double-ended connector; A sealing structure is installed on the flange cover of the first sintered structural component; The second sintered structural component is fastened to the first sintered structural component using fasteners; Install external connectors on multiple first low-voltage conductors, install another external connector on multiple second low-voltage conductors, install the first protective box to the flange cover, and install the second protective box to the flange.

9. A method for manufacturing a low-voltage instrumentation and control cable penetration device for the primary loop of a nuclear power plant according to claim 8, characterized in that, The sintering process, which involves a one-step sealing process of metal pre-oxidation and sintering, includes: Based on a pre-set temperature gradient, the metal pre-oxidation process and sintering process are completed in one step in the heating furnace under a reducing atmosphere.

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