CN115512860A - Glass-metal sealed electrical penetration assembly and preparation method thereof - Google Patents
Glass-metal sealed electrical penetration assembly and preparation method thereof Download PDFInfo
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- CN115512860A CN115512860A CN202211165702.6A CN202211165702A CN115512860A CN 115512860 A CN115512860 A CN 115512860A CN 202211165702 A CN202211165702 A CN 202211165702A CN 115512860 A CN115512860 A CN 115512860A
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- metal
- glass
- inner tube
- sealing
- connecting conductor
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C13/00—Pressure vessels; Containment vessels; Containment in general
- G21C13/02—Details
- G21C13/032—Joints between tubes and vessel walls, e.g. taking into account thermal stresses
- G21C13/036—Joints between tubes and vessel walls, e.g. taking into account thermal stresses the tube passing through the vessel wall, i.e. continuing on both sides of the wall
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C13/00—Pressure vessels; Containment vessels; Containment in general
- G21C13/02—Details
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Installation Of Indoor Wiring (AREA)
Abstract
The invention belongs to the technical field of nuclear reaction safety, and relates to a glass-metal sealed electric penetration piece and a preparation method thereof, wherein the glass-metal sealed electric penetration piece comprises a metal shell, a metal inner tube, sealing glass and a connecting conductor; the metal inner tube is arranged in the metal shell in a penetrating way and is fixedly connected through sealing glass in a sealing way; the connecting conductor is arranged in the metal inner pipe in a penetrating way through threaded connection; gaps are formed between the inner walls of the two ends of the metal inner tube and the connecting conductors, and metal welding fluxes are filled in the gaps. The metal inner tube and the connecting conductor are assembled firstly, and then the metal shell, the metal inner tube, the connecting conductor assembly and the sealing glass are assembled and sealed by melting. The electric penetration piece has high sealing strength and simple and easily controlled preparation process.
Description
Technical Field
The invention belongs to the technical field of nuclear reaction safety, and particularly relates to a glass-metal sealed electric penetration piece and a preparation method thereof.
Background
The electrical penetration piece is special electrical equipment which is arranged on a containment vessel of a nuclear power station reactor and is used for penetrating a cable through the containment vessel. Under normal and various accident conditions, the electrical penetration assembly should be capable of ensuring the integrity of the containment vessel, preventing radioactive substances from leaking out, and maintaining the continuity of electrical and signals in the containment vessel.
The electric penetration piece sealing material mainly comprises high molecules, glass and ceramics, and the metal shell and the metal conductor are sealed by the sealing material, wherein the performance of the electric penetration piece is determined by the sealing material. At present, the polymer sealing material is most widely used, but the polymer material is difficult to avoid aging phenomena such as embrittlement and creep during long-term operation and long-life operation, and has the risk of losing sealing and insulating functions. The glass material has the advantages of stable chemical property, high strength, long service life and the like, so that the glass-metal sealing technology is gradually pursued by people, but the sealing problem of glass and copper is not solved stably all the time, so that the glass-metal sealing electric penetration piece has almost no domestic application case.
The Chinese patent discloses an electric penetration piece and a preparation method thereof (application number 202210088324. X). The cylinder is sealed firstly, then the cylinder and a guide pin are sealed by mechanical cooperation, the sealing reliability has obvious defect, the sealing strength is not too high, the metal cylinder is 4J42 alloy (the resistivity is 0.61 mu omega.m), the resistivity is larger, the heating value is overlarge when large current is applied, and the production process is slightly complicated.
Disclosure of Invention
The invention aims to provide a glass-metal sealed electrical penetration assembly and a preparation method thereof. According to the electric penetration piece, the metal shell and the metal inner pipe are connected through the sealing glass in a sealing mode, the metal inner pipe is connected with the connecting conductor through threads, and the two ends are sealed in a welding mode, so that the technical problem of poor sealing effect is solved, and the production efficiency is improved. By using the structure, the spanning of replacing the high polymer for the sealing material of the conductor assembly of the electrical penetration piece by the inorganic glass is completed, the requirements of various identification tests of the electrical penetration piece of the nuclear power reactor are met, and the service life of the electrical penetration piece is prolonged.
In order to achieve the purpose, the technical scheme adopted by the invention is that the glass-metal sealed electric penetration piece comprises a metal shell, a metal inner tube, sealing glass and a connecting conductor; the metal inner tube penetrates through the metal shell and is fixedly connected through sealing glass in a sealing manner; the connecting conductor is arranged in the metal inner pipe in a penetrating mode through threaded connection; and gaps are formed between the inner walls at the two ends of the metal inner tube and the connecting conductors, and metal solders are filled in the gaps.
Preferably, the inner walls of the two ends of the metal inner pipe are respectively provided with a stepped hole, and an internal thread is arranged on the inner wall of the metal inner pipe between the stepped holes at the two ends; the connecting conductor is provided with an external thread; the metal solder is filled at the stepped hole.
Preferably, the two ends of the connecting conductor, which are provided with the external threads, are kept at the same distance from the two ends of the connecting conductor; and a gap is reserved between the connecting conductor and the side wall of the stepped hole of the metal inner tube, and the metal solder is filled in the stepped hole.
Preferably, an annular groove is formed in the side wall of the stepped hole, and the metal solder is filled in the annular groove.
Preferably, the stepped bore depth is greater than 5mm.
Preferably, the internal thread and the external thread are fine threads.
Preferably, the length of the thread structure of the metal inner pipe is 20-100mm greater than the width of the metal shell.
Preferably, the length of the thread structure on the connecting conductor is 5-20mm shorter than the length of the thread of the metal inner pipe.
The invention also provides a preparation method of the glass-metal sealed electric penetration piece, which comprises the following steps:
s1: preparing a metal shell, sealing glass, a metal inner tube, a connecting conductor and metal solder with required specifications according to requirements;
s2: the connecting conductor is arranged in the metal inner tube in a penetrating mode and connected through a threaded structure, metal welding fluxes are placed in gaps between the inner walls of the two ends of the metal inner tube and the connecting conductor, and a graphite clamp is used for positioning;
s3: assembling a metal shell, sealing glass and a metal inner tube-connecting conductor filled with metal solder on a sintering mold, wherein: firstly, a metal inner tube penetrates through the inner diameter of the sealing glass, and then a metal shell is sleeved at the outer diameter of the sealing glass to form compression sealing;
s4: and placing the assembled workpiece in a sintering furnace for sealing by melting. In the step S4, the sintering temperature is 950-1000 ℃, and the heat preservation time is 10-20 min; gradually cooling and annealing treatment, wherein the temperature reduction system is 850-650-450-250 ℃.
Compared with the prior art, the glass-metal sealed electric penetration piece has the beneficial effects that:
1. the metal inner tube and the connecting conductor are connected and combined at the two ends of the metal inner tube and the connecting conductor through threads penetrating the width of the metal shell to be filled with metal solders to realize sealing, and the sealing strength and the sealing reliability are improved.
2. The inner walls of the two ends of the metal inner pipe are provided with the stepped holes, and the annular grooves are formed in the stepped holes, so that the firmness of the metal solder is further improved, and the sealing reliability is improved.
3. Has the characteristics of high air tightness, high insulation, high voltage resistance, high chemical stability and long service life.
4. The structure is simple, the preparation method is simple, and the preparation method is easy to realize and control.
5. The glass-metal sealing and the solder-metal sealing are integrally fused and sealed, and the method has high efficiency and good consistency.
Drawings
Fig. 1 is a schematic view of a glass-metal sealed electrical feedthrough having a novel conductor connection configuration according to the present invention.
Wherein: comprises a metal shell 1, sealing glass 2, a metal inner tube 3, an annular groove 31, a threaded connection 32, a connecting conductor 4 and metal solder 5.
Detailed Description
For a better understanding of the present invention, the following examples are provided to further illustrate the present invention, but the present invention is not limited to the following examples.
The glass-metal sealed electric penetration piece of the invention, referring to fig. 1, comprises a metal shell 1, sealing glass 2, a metal inner tube 3, a connecting conductor 4 and a metal solder 5.
The metal case 1 has a tubular structure with two ends penetrating through, and is made of stainless steel. The metal inner tube 3 is arranged in the metal shell 1 in a penetrating way and is fixedly connected in a sealing way through the sealing glass 2.
The metal inner tube 3 has a tubular structure with both ends penetrating therethrough, and is made of 4J50 iron-nickel alloy (resistivity 0.43 [ mu ] omega · m). Stepped holes are respectively arranged on the inner walls of the two ends of the metal inner pipe 3, and the inner diameter of each stepped hole is larger than that of the metal inner pipe 3 between the stepped holes at the two ends. The depth of the stepped hole is more than 5mm. An internal thread is arranged on the inner wall of the metal inner tube 3 between the stepped holes at the two ends, and the length of the thread is 20-100mm greater than the width of the metal shell 1, so that when the metal inner tube 3 is arranged in the metal shell 1 in a penetrating manner, the internal thread structure of the metal inner tube 3 penetrates through the width of the metal shell 1 and extends out of the metal shell 1. For the purpose of thread tightness, the internal thread of the metal inner tube 3 is generally of a fine-pitch internal thread structure. An annular groove 31 having a certain depth is formed in the side wall of the stepped hole along the circumferential direction.
The connecting conductor 4 is a round bar structure, and is made of oxygen-free copper or iron-based material with copper alloy wrapped inside. The connecting conductor 4 is provided with external threads, and equal distances are reserved between two ends of the external threads and two ends of the connecting conductor 4. The length of the external thread of the connecting conductor 4 is slightly shorter than that of the internal thread of the metal inner pipe 3 by 5-20mm. The external thread on the connecting conductor 4 is a fine thread. The external thread of the connecting conductor 4 is the same as the nominal diameter of the internal thread of the metal inner pipe 3, and is M5-M100.
The connecting conductor 4 penetrates through the metal inner pipe 3 and is in threaded connection 32 with the metal inner pipe 3, and two ends of the connecting conductor 4 are symmetrically positioned on the outer sides of two ends of the metal inner pipe 3. The fine thread has good self-locking performance and air tightness, so that the sealing performance can be further improved.
The connection conductor 4 and the stepped hole of the metal inner tube 3 are welded and fixed by the metal solder 5, and the connection contact surface between the connection conductor 4 and the metal inner tube 3 is further sealed. The material of the metal solder 5 is silver-copper-palladium alloy. Because the annular groove is formed in the side wall of the stepped hole, the annular groove is filled with the solder when the solder is welded, so that the position of the solder at the stepped hole is limited, and the welding firmness and the sealing strength are improved.
The glass-metal sealed electric penetration piece is combined with a sealing structure with metal solders arranged at two ends of a metal inner tube and a connecting conductor through the threaded connection between the metal inner tube 3 penetrating the width of a metal shell 1 and the connecting conductor 4, and has high sealing strength and good sealing effect.
The glass-metal sealed electrical penetration assembly of the present invention is prepared by the following steps:
s1: preparing a metal shell 1, sealing glass 2, a metal inner tube 3, a connecting conductor 4 and metal solder 5 with required specifications according to requirements;
s2: connecting the metal inner tube 3 and the connecting conductor 4 through a thread structure, placing metal solder 5 at the stepped hole, and positioning by using a graphite clamp;
s3: assembling a metal shell 1, sealing glass 2 and a metal inner tube-connecting conductor filled with metal solder 5 on a sintering mold, wherein the metal inner tube 3 penetrates through the inner diameter of the sealing glass 2, and then sleeving the metal shell 1 at the outer diameter of the sealing glass 2 to form compression sealing;
s4: putting the assembled workpiece into a sintering furnace for melt sealing, wherein the process can simultaneously carry out melt sealing of glass and metal, and solder and metal; the sintering furnace adopted in the sealing process is a mesh belt chain furnace, the sintering temperature is 950-1000 ℃, the heat preservation time is 10-20 min, and then the temperature reduction annealing treatment is carried out gradually in the temperature range of 850-650-450-250 ℃, so that the stress existing in the sintering process can be effectively released.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (10)
1. The glass-metal sealed electric penetration assembly is characterized by comprising a metal shell, a metal inner tube, sealing glass and a connecting conductor; the metal inner tube penetrates through the metal shell and is fixedly connected with the metal shell in a sealing mode through sealing glass; the connecting conductor is arranged in the metal inner pipe in a penetrating mode through threaded connection; and gaps are formed between the inner walls at the two ends of the metal inner tube and the connecting conductors, and metal welding fluxes are filled in the gaps.
2. The glass-metal sealed electrical feedthrough of claim 1, wherein stepped holes are formed in the inner wall of the inner metal tube at both ends, and an internal thread is formed on the inner wall of the inner metal tube between the stepped holes at both ends; the connecting conductor is provided with an external thread; the metal solder is filled at the stepped hole.
3. The glass-to-metal sealed electrical feedthrough of claim 2, wherein the two ends of the connection conductor where the external threads are disposed are equidistant from the two ends of the connection conductor; and a gap is reserved between the connecting conductor and the side wall of the metal inner tube stepped hole, and the metal solder is filled in the stepped hole.
4. The glass-metal sealed electrical feedthrough of claim 3, wherein an annular groove is defined in a sidewall of the stepped bore, the metallic solder filling the annular groove.
5. The glass-to-metal sealed electrical feedthrough of claim 2, wherein the stepped bore depth is greater than 5mm.
6. The glass-to-metal sealed electrical feedthrough as claimed in claim 2, wherein the internal and external threads are fine pitch threads.
7. The glass-to-metal sealed electrical feedthrough as claimed in any of claims 1 to 6, wherein the length of the threaded formation of the metal inner tube is 20-100mm greater than the width of the metal housing.
8. The glass-to-metal sealed electrical feedthrough according to any of claims 1 to 6, wherein the length of the thread formation on the connection conductor is 5-20mm shorter than the length of the metal inner tube thread.
9. The method of making a glass-to-metal sealed electrical feedthrough according to any of claims 1 to 8, comprising the steps of:
s1: preparing a metal shell, sealing glass, a metal inner tube, a connecting conductor and metal solder with required specifications according to requirements;
s2: the connecting conductor is arranged in the metal inner tube in a penetrating mode and connected through a threaded structure, metal welding fluxes are placed in gaps between the inner walls of the two ends of the metal inner tube and the connecting conductor, and a graphite clamp is used for positioning;
s3: assembling a metal shell, sealing glass and a metal inner tube-connecting conductor filled with metal solder on a sintering mold, wherein: firstly, a metal inner tube penetrates through the inner diameter of the sealing glass, and then a metal shell is sleeved at the outer diameter of the sealing glass to form compression sealing;
s4: and placing the assembled workpiece in a sintering furnace for sealing by fusing.
10. The method for preparing a glass-metal sealed electrical penetration assembly according to claim 9, wherein in the step S4, the sintering temperature is 950 to 1000 ℃ and the holding time is 10 to 20min during the sealing; gradually cooling and annealing, wherein the cooling system is 850-650-450-250 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211165702.6A CN115512860A (en) | 2022-09-23 | 2022-09-23 | Glass-metal sealed electrical penetration assembly and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211165702.6A CN115512860A (en) | 2022-09-23 | 2022-09-23 | Glass-metal sealed electrical penetration assembly and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115512860A true CN115512860A (en) | 2022-12-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211165702.6A Pending CN115512860A (en) | 2022-09-23 | 2022-09-23 | Glass-metal sealed electrical penetration assembly and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115512860A (en) |
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2022
- 2022-09-23 CN CN202211165702.6A patent/CN115512860A/en active Pending
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Address after: 710201 No. 15 West Jin Road, Jingwei Industrial Park, Xi'an economic and Technological Development Zone, Shaanxi Applicant after: Xi'an Taijin Xinneng Technology Co.,Ltd. Applicant after: SUZHOU NUCLEAR POWER RESEARCH INSTITUTE Co.,Ltd. Address before: 710201 No. 15 West Jin Road, Jingwei Industrial Park, Xi'an economic and Technological Development Zone, Shaanxi Applicant before: XI'AN TAIJIN INDUSTRIAL ELECTROCHEMICAL TECHNOLOGY Co.,Ltd. Applicant before: SUZHOU NUCLEAR POWER RESEARCH INSTITUTE Co.,Ltd. |
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