A ceramic sealing head structure of a multi-core armored cable and a preparation method thereof

Abstract

The application discloses a ceramic sealing head structure of a multi-core armored cable and a preparation method thereof, and comprises a shell transition piece, a ceramic insulator, core wire isolation ceramic and a sealing transition pipe; the shell transition piece is arranged between a metal armored shell and the ceramic insulator and is in sealing connection with the metal armored shell and the ceramic insulator respectively; the core wire isolation ceramic is arranged in the metal armored shell, the core wire isolation ceramic is provided with isolation holes corresponding to the multiple core wires one by one, the ceramic insulator is provided with multiple groups of core wire penetrating holes, each group of core wire penetrating holes comprises a first through hole and a second through hole which are eccentric to each other, the first through hole is provided with the sealing transition pipe, the core wire penetrates into the first through hole after being bent through the second through hole and is led out through the sealing transition pipe. The application enlarges the core wire leading-out spacing and prolongs the creepage distance by means of the double eccentric holes, and realizes high insulation and reliable sealing leading-out under high temperature and high pressure by means of stress buffering of the transition piece and secondary isolation of the isolation ceramic.

Description

Technical Field

[0001] This invention relates to the field of cable sealing and packaging technology, specifically to a ceramic sealing head structure for multi-core armored cables and its preparation method. Background Technology

[0002] In the field of end-sealing technology for multi-core armored cables, ensuring long-term sealing reliability while safely leading out each core is a key factor limiting the application of such products under high-temperature and high-pressure conditions. Currently, the industry typically uses metal-glass sintering or organic material potting solutions to seal the ends of armored cables. However, with the continuous improvement of system operating voltage and temperature levels, the limitations of these traditional end-sealing structures are becoming increasingly apparent.

[0003] First, there is insufficient high-temperature stability. Glass sintered bodies are prone to microcracks under repeated thermal cycling stress, while organic potting materials suffer from high-temperature aging and decomposition. Both can lead to a significant decrease in the insulation resistance of the end cap, thereby causing insulation failure.

[0004] Secondly, the insulation lacks redundancy. The insulation between multiple core wires and between the core wires and the metal shell often relies on a single ceramic body or a single insulating medium; once the insulation has a local defect, the entire cable is rendered unusable, lacking redundant protection and transition protection.

[0005] Third, it is difficult to simultaneously ensure both sealing strength and airtightness. Ceramics and metals are dissimilar materials with a significant difference in their coefficients of thermal expansion. The sealing interface is prone to cracking due to thermal mismatch stress during brazing cooling and high-temperature service, making it difficult to guarantee both sealing strength and airtightness at the same time, thus limiting the overall pressure resistance rating of the end cap.

[0006] In addition, the core wires of multi-core armored cables often use thermocouple alloys such as nickel-chromium-nickel-silicon and nickel-chromium-nickel-aluminum, or multiple materials such as pure nickel and copper-based conductors. The solderability of core wires of different materials varies, and it is often difficult to reliably seal the lead-out of core wires of multiple materials using a single sealing method. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides a ceramic sealing head structure for multi-core armored cables and its preparation method.

[0008] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a ceramic sealing head structure for a multi-core armored cable, wherein the armored cable includes multiple core wires and a metal armored shell covering the outer periphery of the multiple core wires; the ceramic sealing head structure includes a shell transition piece, a ceramic insulator, a core wire isolation ceramic and a sealing transition tube; The outer casing transition piece is disposed between the metal armored outer casing and the ceramic insulator, and is sealed to both the metal armored outer casing and the ceramic insulator respectively, so as to form a stress buffer structure between the two. The core wire isolation ceramic is housed inside a metal armored shell and located on the inlet side of the ceramic insulator. The core wire isolation ceramic has isolation holes that correspond one-to-one with multiple core wires. The ceramic insulator has multiple sets of core wire holes corresponding to each core wire. Each set of core wire holes includes a first through hole and a second through hole that are eccentrically arranged. Each set of core wire holes is provided with a sealing transition tube, which is installed in the first through hole. Each core wire passes through the corresponding isolation hole and the second through hole in sequence and then enters the first through hole, and is led out through the corresponding sealing transition tube, so that adjacent core wires form mutually separated lead-out paths. The outlet end of the sealing transition pipe is sealed.

[0009] Furthermore, the first through hole in each group of core wire holes is offset relative to the second through hole in a direction away from the axis of the armored cable, so that the distance between the first through holes of adjacent groups of core wire holes is greater than the distance between the corresponding core wires in the armored cable.

[0010] Furthermore, one end of the sealed transition tube is installed in the first through hole by brazing and is sealed to the ceramic insulator, while the other end is the lead-out end, and the opening of the lead-out end is provided with a fusion weld to seal the opening.

[0011] Furthermore, the outer diameter of the core wire isolation ceramic matches the inner diameter of the metal armor shell, with a clearance fit between them.

[0012] Furthermore, the isolation holes of the core wire isolation ceramic are arranged one-to-one with the arrangement of multiple core wires, so as to position and guide each core wire to the corresponding second through hole before the core wire is inserted into the ceramic insulator.

[0013] Furthermore, the sealing weld at the outlet of the sealing transition pipe, together with the sealing connection between the outer shell transition piece and the metal armor shell, constitutes the first seal; the end of the outer shell of the head structure is also sealed with a connector shell, and the weld between the connector shell and the end of the outer shell constitutes a second seal that is independent of the first seal.

[0014] Furthermore, the ceramic insulator is a multi-layered structure composed of multiple ceramic sub-body layers stacked along the axial direction, with the through-holes of each ceramic sub-body layer corresponding to and connected to each other; Furthermore, the sealing transition tube is a multi-hole integrated tube with multiple outlet channels, and the multiple outlet channels are respectively connected to each of the first through holes.

[0015] This invention also provides a method for manufacturing a ceramic sealing head structure for a multi-core armored cable, comprising the following steps: S1. The ceramic insulator is brazed with the sealing transition tube and the outer shell transition piece in a hydrogen furnace to form an integrated airtight assembly; the outer shell transition piece is located between the ceramic insulator and the metal armored outer shell, and forms a compressive stress wrapping around the ceramic insulator during the brazing cooling process. S2. Insert the armored cable into the core wire isolation ceramic, so that each core wire is independently constrained and positioned through the isolation holes of the core wire isolation ceramic, and then install it into the integrated airtight assembly. S3. Insert each core wire into the corresponding core wire hole of the ceramic insulator. The core wire is bent through the second through hole to increase the lead-out distance between adjacent core wires. Then, the core wire is led out through the first through hole with a sealing transition tube installed. S4. After the core wire is led out, the outlet of the sealing transition tube is sealed by fusion welding, and the outer shell transition piece is sealed to the metal armor shell to form the first seal.

[0016] Furthermore, after the first seal is formed, the connector housing is sealed and welded at the end of the housing of the head structure, so that the weld between the connector housing and the end of the housing constitutes the second seal, and the second seal and the first seal form a double seal.

[0017] The present invention has the following beneficial effects: The present invention provides a ceramic sealing end cap structure for a multi-core armored cable and its preparation method: (1) The present invention uses ceramic insulators as the main insulators. Each set of core wire holes is composed of a first through hole and a second through hole that are eccentric to each other. After the core wire is bent through the second through hole, it is repositioned and passes through the first through hole, so that the distance between the lead-out points of adjacent core wires is greater than the original distance between the core wires in the armored cable. Thus, the creepage distance between adjacent core wires is extended without increasing the external size of the ceramic insulator. Combined with the inherent high volume resistivity and high breakdown field strength of the ceramic insulator, the end cap is less prone to surface creepage and breakdown flashover under high voltage conditions. (2) The present invention adopts a layered brazing structure in which the outer shell transition piece, ceramic insulator and sealing transition tube are connected in series. The thermal expansion coefficient of the outer shell transition piece is matched with that of the ceramic insulator, and it acts as a transition and stress buffer layer between the ceramic part and the metal armor shell. It effectively absorbs the thermal mismatch stress generated under brazing cooling and high temperature cycling conditions, and avoids the ceramic body from cracking due to stress concentration. (3) The present invention adds a core wire isolation ceramic outside the ceramic insulator to independently constrain and separate each core wire. Even if the ceramic insulator is partially damaged, the core wire isolation ceramic can still prevent short circuits between wires or breakdown of the shell, forming redundant protection of secondary isolation. At the same time, the core wire isolation ceramic pre-sorts, positions and guides each core wire before it enters the ceramic insulator, improving assembly accuracy and consistency. (4) In this invention, the sealing weld at the outlet of the sealing transition pipe and the sealing connection between the outer shell transition piece and the armored outer shell together constitute the first seal; when the connector is installed, the weld between the connector shell and the end of the head shell constitutes the second seal, forming a double layer of insurance with the first seal, which significantly improves the overall airtight reliability and safety margin of the head. Attached Figure Description

[0018] Figure 1 This is an overall sectional view of the present invention; Figure 2 This is a schematic diagram of the end face of the ceramic insulator in this invention; Figure 3 This is a schematic diagram of the core wire isolation ceramic structure in this invention; Figures 1 to 3 The reference numerals in the attached figures are respectively: 1-core wire, 2-metal armored shell, 3-shell transition piece, 4-ceramic insulator, 5-core wire isolation ceramic, 6-sealed transition tube, 7-isolation hole, 8-first through hole, 9-second through hole, 10-connector shell. Detailed Implementation

[0019] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0020] like Figures 1 to 3 As shown, a ceramic sealing head structure for a multi-core armored cable is used for end sealing of the multi-core armored cable. The number of cores 1 in the armored cable can be two, four, or six, etc. The armored cable includes multiple cores 1, a metal armor shell 2 covering the outer periphery of the multiple cores 1, and a magnesium oxide insulation layer 11 filling the space between the cores 1 and the metal armor shell 2. The sealing head structure includes a shell transition piece 3, a ceramic insulator 4, a core isolation ceramic 5, and a sealing transition tube 6.

[0021] The outer casing transition member 3 is made of a metallic material whose coefficient of thermal expansion is close to that of the ceramic insulator 4; in this embodiment, Kovar alloy is preferred. The outer casing transition member 3 is disposed between the metal armored outer casing 2 and the ceramic insulator 4, and is sealed to both. Its inner side is sealed to the outer periphery of the ceramic insulator 4 via hydrogen furnace brazing, and its outer side is sealed to the metal armored outer casing 2 via argon arc welding or brazing. Thus, the outer casing transition member 3 forms a stress buffer structure between the ceramic insulator 4 and the metal armored outer casing 2, absorbing the thermal mismatch stress generated during brazing cooling and high-temperature service, preventing the ceramic insulator 4 from cracking.

[0022] The core wire isolation ceramic 5 is installed inside the metal armored housing 2 and is located on the inlet side of the ceramic insulator 4. The outer diameter of the core wire isolation ceramic 5 matches the inner diameter of the metal armored housing 2, and the two are either clearance fit or interference fit.

[0023] The core wire isolation ceramic 5 is provided with isolation holes 7 corresponding one-to-one with multiple core wires 1. The isolation holes 7 of the core wire isolation ceramic 5 are arranged one-to-one with the arrangement of the multiple core wires 1 to position and guide each core wire 1 to its corresponding second through hole 9 before it enters the ceramic insulator 4. Each core wire 1 passes through its corresponding isolation hole 7 before entering the ceramic insulator 4, thus completing pre-positioning and preliminary guidance before entering the ceramic insulator 4, limiting radial offset and mutual crossing of the core wires 1, and accurately guiding them to their corresponding second through hole 9, thereby ensuring the guiding effect of the double eccentric core wire through hole. Simultaneously, the core wire isolation ceramic 5 and the ceramic insulator 4 form a double-stage ceramic insulation structure arranged front and back along the lead-out direction of the core wires 1. This allows the core wires 1 to pass through two stages of ceramic insulation isolation sequentially during their entry into the end cap, further increasing the insulation path, reducing the risk of partial discharge and electrical breakdown, and improving the end cap's withstand voltage performance, assembly consistency, and long-term service reliability. Since the core wire isolation ceramic 5 prepositions and radially constrains each core wire 1, the position of each core wire 1 can remain stable during subsequent brazing, welding and encapsulation processes, reducing assembly deviations caused by core wire 1 swinging and frictional damage between core wire 1 and ceramic hole wall, thereby improving the consistency of end cap assembly and product yield.

[0024] Furthermore, by setting up the core wire isolation ceramic 5, on the one hand, multiple isolation holes 7 independently constrain and separate each core wire 1, keeping the core wire 1 isolated from the metal armor shell 2 and from each core wire 1 to each other. This prevents insulation failure and voltage drop caused by the core wire 1 touching the shell or inter-wire contact due to external forces during assembly. Even if the ceramic insulator 4 is partially damaged, the core wire isolation ceramic 5 can still maintain isolation, thus forming a redundant protection of secondary isolation in conjunction with the ceramic insulator 4. On the other hand, before the core wire 1 is inserted into the ceramic insulator 4, the core wire isolation ceramic 5 pre-organizes, positions, and guides multiple core wires 1, ensuring that each core wire 1 is smoothly introduced into the corresponding second through hole 9 of the ceramic insulator 4 according to the design spacing. This forms a synergistic guiding effect with the double eccentric core wire insertion hole, improving assembly consistency while forming a double-stage ceramic insulation structure, thus improving the voltage withstand performance and long-term reliability of the end cap.

[0025] The ceramic insulator 4 is a columnar component integrally sintered from high-purity alumina ceramic, possessing high density, high volume resistivity, and high breakdown field strength. The ceramic insulator 4 is located at the end of the armored cable, and its outer periphery is sealed to the metal armored shell 2 via the outer shell transition piece 3. As an optional embodiment, the ceramic insulator 4 is a multi-layered stacked structure composed of multiple ceramic sub-body layers stacked axially, with the core holes of each layer interconnected to accommodate longer creepage distances or arrangements with a higher core count.

[0026] The ceramic insulator 4 has multiple sets of through holes corresponding to each core wire 1. Each set of through holes includes a first through hole 8 and a second through hole 9 that are eccentrically arranged. A sealing transition tube 6 is provided for each set of through holes. The sealing transition tube 6 is installed in the first through hole 8. Each core wire 1 passes through the corresponding isolation hole 7 and the second through hole 9 in sequence and enters the first through hole 8, and is led out through the corresponding sealing transition tube 6, so that adjacent core wires 1 form mutually separated lead-out paths. The first through hole 8 in each set of through holes is offset relative to the second through hole 9 in a direction away from the axis of the armored cable, so that the distance between the first through holes 8 of adjacent sets of through holes is greater than the distance between the corresponding core wires 1 in the armored cable. By eccentrically setting the first through hole 8 and the second through hole 9, the core wire 1 forms an offset guide path within the ceramic insulator 4. Without changing the arrangement of the core wire 1 inside the armored cable, the spacing between the sealing transition tubes 6 at the lead-out end is redistributed, thereby increasing the insulation distance and creepage distance between adjacent lead-out core wires 1. It can also be adapted to connectors with different pin arrangement sizes.

[0027] Because the sealing transition tubes 6 are installed within the first through holes 8, the leading-out sealing transition tubes 6 simultaneously form a larger spacing. Without increasing the overall size of the end cap, this increases the air insulation distance between adjacent core wires 1, the creepage distance along the ceramic surface, and the electrical clearance, reducing the risk of local electric field concentration and discharge. This improves the pressure resistance, insulation reliability, and long-term high-temperature service stability of the end cap structure. Furthermore, the increased spacing between the first through holes 8 simultaneously increases the welding operation space between the sealing transition tubes 6, ensuring that the welding and lead-out end sealing operations of each sealing transition tube 6 do not interfere with each other. This not only reduces the risk of heat affecting adjacent weld points and solder cross-linking during welding but also improves the assembly consistency and production yield of multi-core end caps.

[0028] As an optional implementation, the eccentricity between the first through hole 8 and the second through hole 9 (i.e., the offset distance between the centers of the two holes) can be set according to the rated voltage level and the required creepage distance; the offset direction of the first through hole 8 is not limited to strictly radially away from the axis, but can also be offset along any tangential or oblique direction that increases the distance between adjacent first through holes 8, as long as the distance between adjacent sets of first through holes 8 is greater than the original distance of the core wire 1.

[0029] In existing schemes that use a single ceramic body to seal and lead out multi-core wires 1, the spacing between the through holes on the ceramic body is usually equal to the original dense spacing of the core wires 1 within the armored cable. Therefore, the creepage distance between adjacent lead-out core wires 1 is limited by the original spacing of the core wires 1 in the cable. Under high-voltage conditions, an excessively short creepage distance can easily lead to surface discharge or even breakdown flashover, becoming a bottleneck restricting the withstand voltage rating of the end cap.

[0030] This invention designs each set of core wire holes in the ceramic insulator 4 as a first through hole 8 and a second through hole 9 that are mutually eccentric. When the core wire 1 is led out from the armored cable at its original spacing, it first passes through the second through hole 9, which is located close to the original position of the core wire 1. At this point, it is bent and its direction is changed, and then it is offset to the first through hole 8, which is offset in the direction away from the axis, and then led out through the sealed transition tube 6 installed in the first through hole 8. Since the first through hole 8 is offset outward relative to the second through hole 9, the distance between the lead-out points of adjacent core wires 1 is enlarged to be greater than the original spacing of the core wires 1. In this way, without increasing the external dimensions of the ceramic insulator 4 or changing the original arrangement of the core wires 1, the creepage distance between adjacent core wires 1 can be significantly extended, thereby improving the insulation and withstand voltage capability of the end cap.

[0031] One end of the sealing transition tube 6 is brazed into the first through hole 8 and then brazed with the ceramic insulator 4 in a hydrogen furnace to achieve a sealed connection. The other end of the sealing transition tube 6 is the lead-out end, which is sealed. Specifically, the opening of the lead-out end is provided with a fusion weld to seal the opening. After the core wire 1 is led out through this lead-out end, the opening of the lead-out end is sealed by self-fusion welding to form a sealing weld. The good weldability of the sealing transition tube 6 allows it to meet the welding and sealing requirements of core wires 1 made of different materials, such as nickel-chromium-nickel-silicon, nickel-chromium-nickel-aluminum alloys, and pure nickel and copper-based conductors.

[0032] In addition to the sealing transition tube 6 being an independent single tube corresponding to each of the first through holes 8, in an optional embodiment, the sealing transition tube 6 can also be designed as a multi-hole integrated tube according to the number of core wires 1, that is, a multi-hole integrated tube with multiple lead-out channels, with the multiple lead-out channels respectively connected to each of the first through holes 8, so as to simplify assembly and improve consistency.

[0033] The sealing weld at the outlet of the sealing transition pipe 6, together with the sealing connection between the outer shell transition piece 3 and the metal armor shell 2, constitutes the first seal. This seal is used to close the outlet channel of the core wire 1 and the interface between the outer shell and the head, forming an airtight sealing structure for the head body. This first seal forms the main airtight barrier, blocking the leakage path between the inside of the head and the outside, ensuring the airtightness of the head, preventing leakage of the medium along the inner cavity of the sealing transition pipe 6 and the gap between the core wire 1, and preventing leakage of the medium along the joint between the metal armor shell 2 and the ceramic sealing assembly.

[0034] The end of the head structure's outer shell is also sealed with a connector housing 10. The weld between the connector housing 10 and the end of the outer shell forms a second seal independent of the first seal. The second seal is located outside the first seal and forms an independent series redundant sealing system with the first seal. When the sealing performance of the first seal deteriorates due to long-term high-temperature service, thermal cycling, or local damage, the second seal can continue to block media leakage, extend the leakage path, and improve the overall airtight reliability, safety, and long-term service stability of the head, making it particularly suitable for high-temperature, high-pressure, and high-reliability operating conditions.

[0035] This invention also provides a method for manufacturing a ceramic sealing head structure for a multi-core armored cable, comprising the following steps: S1. The ceramic insulator 4 is brazed with the sealing transition pipe 6 and the outer shell transition piece 3 in a hydrogen furnace to form an integrated airtight assembly; the outer shell transition piece 3 is located between the ceramic insulator 4 and the metal armored outer shell 2, and forms a compressive stress wrapping around the ceramic insulator 4 during the brazing cooling process. S2. Insert the armored cable into the core wire isolation ceramic 5, so that each core wire 1 is independently constrained and positioned by the isolation hole 7 of the core wire isolation ceramic 5, and then install it into the integrated airtight assembly. S3. Insert each core wire 1 into the corresponding core wire hole of the ceramic insulator 4, wherein the core wire 1 is bent through the second through hole 9 to expand the lead-out spacing of adjacent core wires 1, and then the core wire 1 is led out through the first through hole 8 where the sealing transition tube 6 is installed. S4. After the core wire 1 is led out, the outlet of the sealing transition tube 6 is sealed by fusion welding, and the outer shell transition piece 3 is sealed to the metal armor shell 2 to form the first seal.

[0036] After the first seal is formed, the connector housing 10 is sealed and welded to the end of the housing of the head structure, so that the weld between the connector housing 10 and the end of the housing forms the second seal, and the second seal and the first seal form a double seal.

[0037] Additionally, it should be noted that components not described in detail in this article are existing technologies.

[0038] 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 ceramic sealing head structure for a multi-core armored cable, the armored cable comprising multiple core wires (1) and a metal armor shell (2) covering the outer periphery of the multiple core wires (1), characterized in that, It includes a housing transition piece (3), a ceramic insulator (4), a core wire isolation ceramic (5), and a sealing transition tube (6); The outer shell transition member (3) is disposed between the metal armored outer shell (2) and the ceramic insulator (4), and is sealed to the metal armored outer shell (2) and the ceramic insulator (4) respectively to form a stress buffer structure between the two. The core wire isolation ceramic (5) is disposed inside the metal armor shell (2) and located on the inlet side of the ceramic insulator (4). The core wire isolation ceramic (5) is provided with isolation holes (7) corresponding one-to-one with the multiple core wires (1). The ceramic insulator (4) is provided with multiple sets of core wire holes corresponding to each core wire (1). Each set of core wire holes includes a first through hole (8) and a second through hole (9) arranged eccentrically. Each set of core wire holes is provided with a sealing transition tube (6). The sealing transition tube (6) is installed in the first through hole (8). Each core wire (1) passes through the corresponding isolation hole (7) and the second through hole (9) in sequence and enters the first through hole (8), and is led out through the corresponding sealing transition tube (6) so that adjacent core wires (1) form mutually separated lead-out paths. The outlet end of the sealing transition tube (6) is sealed.

2. The ceramic sealing head structure for multi-core armored cables according to claim 1, characterized in that, The first through hole (8) in each group of core wire holes is offset relative to the second through hole (9) in a direction away from the axis of the armored cable, so that the distance between the first through holes (8) of adjacent groups of core wire holes is greater than the distance between the corresponding core wires (1) in the armored cable.

3. The ceramic sealing head structure for multi-core armored cables according to claim 2, characterized in that, One end of the sealed transition tube (6) is installed in the first through hole (8) by brazing and is sealed to the ceramic insulator (4). The other end is the lead-out end, and the opening of the lead-out end is provided with a fusion weld to seal the opening.

4. The ceramic sealing end cap structure for multi-core armored cables according to claim 1, characterized in that, The outer diameter of the core wire isolation ceramic (5) matches the inner diameter of the metal armor shell (2), and the two are in a clearance fit.

5. The ceramic sealing end cap structure for multi-core armored cables according to claim 1, characterized in that, The isolation holes (7) of the core wire isolation ceramic (5) are arranged one-to-one with the arrangement of the multiple core wires (1) so as to position and guide each core wire (1) to the corresponding second through hole (9) before the core wire (1) passes through the ceramic insulator (4).

6. The ceramic sealing end cap structure for multi-core armored cables according to claim 1, characterized in that, The sealing weld at the outlet of the sealing transition pipe (6) together with the sealing connection between the outer shell transition piece (3) and the metal armor shell (2) constitutes the first seal; the end of the shell of the head structure is also sealed and welded with a connector shell (10), and the weld between the connector shell (10) and the end of the shell constitutes the second seal, which is independent of the first seal.

7. The ceramic sealing head structure for multi-core armored cables according to claim 1, characterized in that, The ceramic insulator (4) is a multi-layered structure composed of multiple ceramic sub-body layers stacked along the axial direction, with the through-holes of each ceramic sub-body layer corresponding to and connected to each other.

8. The ceramic sealing end cap structure for multi-core armored cables according to claim 1, characterized in that, The sealing transition tube (6) is a multi-hole integrated tube with multiple outlet channels, and the multiple outlet channels are respectively connected to each of the first through holes (8).

9. A method for manufacturing a ceramic sealing end cap structure for a multi-core armored cable, used to manufacture the ceramic sealing end cap structure for a multi-core armored cable as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1. The ceramic insulator (4) is brazed with the sealing transition tube (6) and the outer shell transition piece (3) in a hydrogen furnace to form an integrated airtight assembly; the outer shell transition piece (3) is located between the ceramic insulator (4) and the metal armored outer shell (2), and forms a compressive stress wrapping around the ceramic insulator (4) during the brazing cooling process; S2. Insert the armored cable into the core wire isolation ceramic (5), so that each core wire (1) is independently constrained and positioned through the isolation hole (7) of the core wire isolation ceramic (5), and then installed into the integrated airtight assembly. S3. Insert each of the core wires (1) into the corresponding core wire hole of the ceramic insulator (4), wherein the core wire (1) is bent through the second through hole (9) to expand the lead-out spacing of adjacent core wires (1), and then the core wire (1) is led out through the first through hole (8) on which the sealing transition tube (6) is installed. S4. After the core wire (1) is led out, the outlet of the sealing transition tube (6) is sealed by fusion welding, and the outer shell transition piece (3) is sealed to the metal armor shell (2) to form the first seal.

10. The method for manufacturing the ceramic sealing end cap structure of the multi-core armored cable according to claim 9, characterized in that, After the first seal is formed, the connector housing (10) is sealed and welded at the end of the housing of the head structure, so that the weld between the connector housing (10) and the end of the housing forms a second seal, and the second seal and the first seal form a double seal.

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