A stainless steel multi-core connector having an air-tight seal and a manufacturing method thereof

Abstract

The present application belongs to the technical field of electric connector, especially a stainless steel multi-core connector with air-tight seal and a manufacturing method thereof. The connector is manufactured by positioning and assembling a stainless steel shell, a plurality of high-temperature-resistant lead wires and a plurality of microcrystalline glass insulating mediums through a sealing mold, and then sealing at a temperature above 980 DEG C. The stainless steel shell is provided with a plurality of through holes, the high-temperature-resistant lead wires penetrate through the through holes and are sealed and fixed with the through holes through the microcrystalline glass insulating mediums. The present application realizes high sealing and high reliability sealing through the stainless steel shell, the microcrystalline glass insulating mediums and lead wires of different materials, and meets the requirements of narrow pitch, multiple lead wires, large current transmission, high sealing and high reliability of the multi-core connector.

Description

Technical Field

[0001] This invention belongs to the field of electrical connector technology, and particularly relates to a stainless steel multi-core connector with an airtight seal and its manufacturing method. Background Technology

[0002] Sealed electrical connectors are widely used in special applications such as infrared detection and imaging systems, aerospace and underwater vehicle equipment, to achieve electrical signal connection and sealing functions. As electronic equipment develops towards higher density, higher performance, and higher reliability, electrical connectors need to meet application requirements such as multiple leads, narrow pitch (≤1.27 mm), high current transmission, high airtightness, and high reliability.

[0003] Currently, the contacts of most existing sealed electrical connectors are made of materials such as Kovar alloy or low-carbon steel. Taking a typical existing sealed connector as an example, its lead pitch is 1.27 mm × 1.27 mm, the lead material is Kovar alloy, the resistivity is approximately 0.53 μΩ·m, and the hermeticity index is ≤1.0×10⁻⁶. -3 Pa cm 3 / s, reliability is tested through 100 temperature cycles.

[0004] However, the aforementioned sealed electrical connectors made of Kovar alloy or low-carbon steel still have shortcomings in meeting the requirements of high current transmission, high airtightness, and high reliability. For example, Kovar alloy has a high resistivity, which easily leads to significant temperature rise under high current conditions, affecting the performance and lifespan of the connector; its airtightness and long-term reliability are also difficult to meet increasingly stringent usage requirements.

[0005] Therefore, there is an urgent need to provide a stainless steel multi-core connector with an airtight seal and its manufacturing method to solve the above problems. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, this invention provides a hermetically sealed stainless steel multi-core connector and its manufacturing method. The connector of this invention can simultaneously meet the requirements of high current transmission, high hermetically tightness, and high reliability.

[0007] To achieve one of the above objectives, the present invention adopts the following technical solution: A stainless steel multi-core connector with an airtight seal is provided. The connector is made by assembling a stainless steel shell, several high-temperature resistant leads and several microcrystalline glass insulating media through a sealing mold and then sealing it at a sealing temperature of over 980°C. The stainless steel shell has several through holes, through which the high-temperature resistant leads pass and are sealed and fixed to the through holes by the microcrystalline glass insulating media.

[0008] Preferably, the microcrystalline glass insulating medium is made by sequentially pressing, debinding, and vitrifying glass powder; the coefficient of thermal expansion of the microcrystalline glass insulating medium is 11ppm / ℃~22ppm / ℃.

[0009] Preferably, the high-temperature resistant lead wire is one of the following: PAC-6 Alloy, 304L stainless steel, 316L stainless steel, and Hastelloy.

[0010] Preferably, the sealing mold is made of stainless steel and includes a lower sealing mold and an upper sealing mold. The lower sealing mold has a countersunk platform and a lower lead positioning hole located in the countersunk platform. The countersunk platform is adapted to the shape of the stainless steel shell. The inner cavity size of the countersunk platform is 0.05 mm to 0.1 mm larger than the outer size of the stainless steel shell to form a clearance fit. The upper sealing mold has an upper lead positioning hole corresponding to the sealing through hole of the shell. The upper lead positioning hole and the lower lead positioning hole are both set to correspond one-to-one with the through hole. The diameter of the upper lead positioning hole and the diameter of the lower lead positioning hole are both 0.01 mm to 0.05 mm larger than the outer diameter of the high-temperature resistant lead wire.

[0011] Preferably, both the lower sealing mold and the upper sealing mold are provided with loading and unloading through holes, the positions of which correspond to the positions of the outer shell base. By setting the loading and unloading through holes, the lead wire is not subjected to force during mold removal, and the mold removal is made simple. Both ends of the lower sealing mold are provided with hand grip grooves, which make it easy to put fingers in and apply force to remove the mold during disassembly.

[0012] Preferably, the stainless steel shell and the high-temperature resistant lead wire are both pretreated before sealing; the pretreatment includes cleaning, annealing and oxidation in sequence.

[0013] To achieve the second objective mentioned above, the present invention provides a method for manufacturing a stainless steel multi-core connector with an airtight seal, the specific steps of which are as follows: S1: Set the temperature of the tube furnace. The temperature setting is based on the high-temperature sealing temperature of the microcrystalline glass insulating medium. After the furnace temperature stabilizes, perform staged temperature calibration of the tube furnace to obtain the corresponding position of the quartz crystallization temperature T3 in the tube furnace. S2: Set the temperature of the tube furnace. The temperature is set according to the crystallization temperature of the glass-ceramic insulating medium. After the furnace temperature stabilizes, the tube furnace is calibrated in stages to obtain the corresponding position of the phase change temperature T4 in the tube furnace. S3: Set the tube furnace temperature to the high-temperature sealing temperature T1. After the temperature stabilizes, install the connector in the sealing mold, and then send the assembled assembly to the tube furnace for high-temperature sealing and keep it at the sealing temperature T1. S4: After the heat preservation is completed, the assembly is sent to the quartz crystallization temperature T3 position for rapid cooling and heat preservation according to the calibrated temperature. The rapid cooling rate is 50℃ / min~150℃ / min. S5: Set the tube furnace temperature to the crystallization temperature. After the temperature stabilizes, send the product into the tube furnace and heat it to the cristobalite phase growth temperature T2. Then keep it at the temperature until the microcrystalline glass insulating medium grains grow. The crystallization temperature and crystallization time are adjusted according to the different materials of the leads. S6: After step S5 is completed, the assembly is sent to the phase change temperature T4 position to cool down to the phase change temperature T4 according to the calibrated temperature. S7: After step S6, cool to room temperature at a rate of 5℃ / min to 40℃ / min.

[0014] Preferably, in step S3, the sealing temperature T1 is equal to the glass viscosity of 10. 4 ~10 5 The temperature is set at 10 Pa·s, and the holding time is 10–20 minutes.

[0015] Preferably, the heat preservation time in step S4 is 30 to 40 minutes.

[0016] Preferably, the cooling rate in step S6 is 10℃ / min to 50℃ / min.

[0017] The advantages of this invention are: (1) This invention achieves stable dual-high-temperature peak sealing in a conventional tube furnace by calibrating the tube furnace with gradient temperatures, thereby completing high-quality sealing of glass-ceramic. This method significantly reduces the requirements for large-scale, high-precision sealing equipment, effectively reducing production equipment investment costs, and is suitable for the mass production and rapid manufacturing of glass-ceramic sealing processes. On this basis, it can reliably achieve sealing of materials with high expansion coefficients such as copper alloys and stainless steel, meeting the stringent requirements of electrical connectors in terms of high current transmission, high airtightness, and long-term reliability. By introducing a specially designed stainless steel sealing mold, the lead wire position can be precisely controlled within the range of 1.27mm ± 0.03mm, fully meeting the design standards for mating and disassembly forces of electrical connectors, thereby further improving the long-term stability of electrical connectors.

[0018] (2) The production equipment used in this invention is a tubular furnace, which has low equipment threshold and is easy to operate. Through reasonable process control, the entire sealing process runs stably, and the product yield and reliability are significantly improved. At the same time, through the optimized design of mold materials and structural dimensions, the accuracy of the product lead position is effectively guaranteed. This process has extremely high scientific research value and engineering application value. Experiments show that the stainless steel multi-core connectors produced using this process can achieve a yield of over 90%, and have good feasibility for mass production.

[0019] (3) The microcrystalline glass insulating medium provided by this invention has an adjustable coefficient of expansion, enabling high-sealing and high-reliability sealing with stainless steel shells and leads of different materials. This manufacturing method has low requirements for production equipment, good process stability, high yield, excellent product reliability, and high lead position accuracy, demonstrating extremely high scientific research value and industrial application prospects. By rationally selecting stainless steel shells, microcrystalline glass insulating media, and leads of various materials, high-sealing and high-reliability sealing effects can be achieved, fully meeting the comprehensive technical requirements of multi-core connectors in terms of narrow pitch, multiple leads, high current transmission, and high sealing and high reliability.

[0020] (4) In a specific embodiment of the present invention, the connector adopts a stainless steel chassis and a copper alloy lead wire structure. The lead wire pitch is designed to be 1.27mm × 1.10mm, and the lead wire material is selected from copper alloy, which has a resistivity as low as 0.31μΩ·m, which is beneficial for high current and low loss transmission. The product's airtightness index can be controlled within ≤1×10 -3 Pa·cm 3 Within a certain range (within 1 second), it can stably pass 500 temperature cycle reliability tests, demonstrating excellent temperature resistance and long-term stability.

[0021] (5) The microcrystalline glass insulating medium in this invention has an expansion coefficient that can be flexibly controlled by adjusting the crystal type and degree of crystallization in the sealing process. The overall expansion coefficient can be continuously adjusted within the range of 11ppm / ℃ to 22ppm / ℃. This characteristic enables it to achieve good matching with stainless steel shells and lead materials with different expansion characteristics, thereby meeting the requirements of high sealing and high reliability sealing. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of one side of the invention.

[0023] Figure 2 This is a schematic diagram of the structure on the other side of the present invention.

[0024] Figure 3 for Figure 1 A top-view structural diagram.

[0025] Figure 4 This is a schematic diagram of the structure on one side after assembly of the present invention.

[0026] Figure 5 This is a schematic diagram of the other side of the structure after the present invention is assembled.

[0027] Figure 6 This is a schematic diagram of the process flow of the present invention.

[0028] Figure 7 This is a schematic diagram showing the temperature calibration of various parts of the tubular furnace of the present invention.

[0029] Figure 8 This is a schematic diagram of the high-temperature sealing process of the present invention.

[0030] The meanings of the symbols in the diagram are as follows: 1-Stainless steel shell, 2-High temperature resistant lead wire, 3-Microcrystalline glass insulating medium, 4-Sealing upper mold, 5-Sealing lower mold, 6-Sunk platform, 7-Lower lead wire positioning hole, 8-Upper lead wire positioning hole, 9-Loading and unloading through hole, 10-Hand grip slot. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0032] like Figure 1-5 As shown, a hermetically sealed stainless steel multi-core connector includes a high-temperature resistant lead 2, a microcrystalline glass insulating medium 3, and a stainless steel shell 1. The stainless steel shell 1 has several through holes, and the microcrystalline glass insulating medium 3 is fixed in these holes. The middle portion of the high-temperature resistant lead 2 is inserted into the microcrystalline glass insulating medium 3, and then the connector is formed by high-temperature sealing. The coefficient of thermal expansion of the microcrystalline glass insulating medium 3 can be adjusted by controlling the crystallization type and degree through different sealing processes. The coefficient of thermal expansion is adjustable within the range of 11ppm / ℃ to 22ppm / ℃ to meet the requirements of high-sealing and high-reliability sealing between the stainless steel shell 1 and leads of different materials.

[0033] Specifically, the microcrystalline glass insulating medium 3 is made from glass powder through processes such as pressing, debinding, and vitrification. Before high-temperature sealing, the stainless steel shell 1 and the high-temperature resistant lead 2 require pretreatment including cleaning, annealing (stress relief and purification), and oxidation (forming an oxide layer on the metal surface to facilitate subsequent bonding between the metal and glass). The high-temperature resistant lead 2 is made of materials such as PAC-6 Alloy, 304L stainless steel, 316L stainless steel, and Hastelloy. After the microcrystalline glass insulating medium 3, the pretreated stainless steel shell 1, and the high-temperature resistant lead 2 are positioned and assembled using a sealing mold, they are then subjected to high-temperature sealing.

[0034] Furthermore, the high-temperature sealing equipment is a tube furnace. High-temperature sealing is carried out under a protective atmosphere such as nitrogen or argon to prevent oxidation by air. The high-temperature sealing process adopts different sealing processes (controlling different times and temperatures) according to different lead materials. The sealing process is a dual high-temperature sealing process, mainly consisting of a rapid heating stage, a high-temperature melting stage, a cooling nucleation stage, a high-temperature grain growth stage, and a cooling stage.

[0035] Furthermore, the sealing mold is made of stainless steel and consists of a lower sealing mold 5 and an upper sealing mold 4. The lower sealing mold 5 has a countersunk platform 6 corresponding to the shape of the stainless steel outer shell 1 and a lower lead wire positioning hole 7 corresponding to the through hole. The size of the countersunk platform 6 is 0.05mm to 0.1mm larger than the outer shell size, and the diameter of the lower lead wire positioning hole 7 is 0.01mm to 0.05mm larger than the outer diameter of the high-temperature resistant lead wire 2. The upper sealing mold 4 has an upper lead wire positioning hole 8 corresponding to the through hole, and the diameter of the upper lead wire positioning hole 8 is 0.01mm to 0.05mm larger than the outer diameter of the high-temperature resistant lead wire 2. The lower sealing mold 5 mainly restricts the movement of the chassis and limits the length and position of the lower lead wire; the upper sealing mold 4 mainly restricts the length and position of the upper lead wire.

[0036] Both the lower sealing mold 5 and the upper sealing mold 4 are provided with loading and unloading through holes 9. The position of the loading and unloading through holes 9 corresponds to the position of the outer shell base. By setting the loading and unloading through holes 9, the lead wire can be prevented from being stressed during mold removal, and the mold removal is made simple. Both ends of the lower sealing mold 5 are provided with hand grip slots 10.

[0037] like Figure 6-8 As shown, a method for manufacturing a stainless steel multi-core connector with a gas seal is described, wherein all high-temperature sealing steps are performed in a protective atmosphere such as nitrogen or argon. The specific steps are as follows: Step 1: Set the temperature of the tube furnace. The temperature is set according to the high temperature sealing temperature of the microcrystalline glass insulating medium 3. After the furnace temperature stabilizes, perform staged temperature calibration on the tube furnace to obtain the corresponding position of the quartz crystallization temperature T3 in the tube furnace. Step 2: Set the temperature of the tube furnace according to the crystallization temperature of the microcrystalline glass insulating medium 3. After the furnace temperature stabilizes, perform staged temperature calibration on the tube furnace to obtain the corresponding position of the phase transition temperature T4 (below the crystallization temperature, that is, below the crystallization temperature of cristobalite) in the tube furnace. Step 3: Set the tube furnace temperature to the high-temperature sealing temperature (glass viscosity 10). 4 ~10 5 After the temperature stabilizes, the assembled assembly is sent to a tube furnace for high-temperature sealing (i.e., above the softening point of the glass-ceramic) and held for 10 to 20 minutes to reach the melting point T1 of the glass-ceramic (the holding time is the time t1 for the glass-ceramic to seal the metal). Step 4: After the heat preservation is completed, the assembly is sent to the temperature T3 position for rapid cooling and heat preservation for 30 to 40 minutes according to the calibrated temperature. The rapid cooling rate is 50℃ / min to 150℃ / min. Step 5: Set the tube furnace temperature to the crystallization temperature. After the temperature stabilizes, send the product into the tube furnace and heat it to the cristobalite phase growth temperature T2, then hold it at that temperature until the microcrystalline glass insulating medium 3 grains grow; crystallization temperature and crystallization time ( Figure 8 T2 and T3 are adjusted according to the different lead wire materials.

[0038] Step 6: After step 5, send the assembly to the phase transition temperature T4 position according to the calibrated temperature, and cool it down to the phase transition temperature T4 at a cooling rate of 10℃ / min~50℃ / min. Step 7: After step 6, cool to room temperature at a rate of 5℃ / min to 40℃ / min to obtain the stainless steel multi-core connector. The obtained stainless steel multi-core connector meets the visual inspection requirements for metal housings in Appendix A of GJB2440B-2024 "General Specification for Hybrid Integrated Circuit Housings", and the airtightness test results are all ≤1×10 -3 Pa cm 3 / s (A4 He), the yield rate can reach over 90%.

[0039] like Figure 8 As shown, the temperature calibration of the tubular furnace is as follows: 1) Set the temperature to the high-temperature sealing temperature and calibrate the temperature of each part between the high-temperature zone and the cooling zone; 2) Set the temperature to the high-temperature microcrystallization temperature and calibrate the temperature of each part between the high-temperature zone and the cooling zone. The high-temperature sealing and microcrystallization process refers to the double high-temperature peak sealing process required for microcrystalline glass sealing through two settings.

[0040] The sealing process is a dual high-temperature peak sealing process, which mainly consists of a rapid heating stage (before t1), a high-temperature melting stage (t1 stage), a cooling nucleation stage (the entire stage from t1 to t2+t2), a high-temperature grain growth stage (the entire stage from t2 to t3+t3), and a cooling stage (after t3).

[0041] The main process parameters for the following embodiments and comparative examples are shown in Table 1 below: Table 1

[0042] Example 1

[0043] The mold is made of stainless steel, and the mold positioning hole diameter is 0.01mm larger than the lead wire outer diameter. The mold is designed with loading and unloading through holes. The sealing equipment uses a tube furnace, and the sealing process adopts double-peak sealing, as detailed below: Step 1: Set the temperature of the tube furnace. The temperature is set according to the high temperature sealing temperature of the microcrystalline glass insulating medium 3. After the furnace temperature stabilizes, perform staged temperature calibration on the tube furnace to obtain the corresponding position of temperature T3 in the tube furnace. Step 2: Set the temperature of the tube furnace according to the crystallization temperature of the microcrystalline glass insulating medium 3. After the furnace temperature stabilizes, perform staged temperature calibration on the tube furnace to obtain the corresponding position of temperature T4 in the tube furnace. Step 3: Set the tube furnace temperature to the high-temperature sealing temperature. After the temperature stabilizes, send the assembled assembly to the tube furnace insulation zone for 15 minutes for high-temperature sealing. Step 4: After the heat preservation is completed, the assembly is sent to the temperature T3 position for rapid cooling and heat preservation for 35 minutes according to the calibrated temperature. The rapid cooling rate is 85℃ / min. Step 5: Set the tube furnace temperature to the crystallization temperature. After the temperature stabilizes, send the product to the tube furnace insulation zone and keep it at that temperature for a certain period of time to allow the microcrystalline glass insulating medium grains to grow. The crystallization temperature and crystallization time are adjusted according to the different lead materials.

[0044] Step 6: After step 5, send the assembly to the temperature T4 position according to the calibrated temperature, and cool it down to the phase transition temperature T4 at a cooling rate of 15℃ / min. Step 7: After step 6, cool to room temperature at a rate of 15℃ / min to obtain a stainless steel multi-core connector with an airtight seal.

[0045] Example 2

[0046] This embodiment uses the same steps as Embodiment 1. Specific parameters are shown in Table 1. Other unlisted parameters, processes, etc. are the same as in Embodiment 1.

[0047] Example 3

[0048] This embodiment uses the same steps as Embodiment 1. Specific parameters are shown in Table 1. Other unlisted parameters, processes, etc. are the same as in Embodiment 1.

[0049] Example 4

[0050] This embodiment uses the same steps as Embodiment 1. Specific parameters are shown in Table 1. Other unlisted parameters, processes, etc. are the same as in Embodiment 1.

[0051] Comparative Example 1

[0052] The comparative mold is made of graphite. The other design and process parameters are the same as those in Example 1. The specific parameters are shown in Table 1. Other parameters and processes not listed are the same as those in Example 1.

[0053] Comparative Example 2

[0054] The positioning hole diameter of the comparative mold is designed to be the outer diameter of the lead wire + 0.10. The other design and process parameters are the same as those in Example 1. The specific parameters are shown in Table 1. Other unlisted parameters and processes are the same as those in Example 1.

[0055] Comparative Example 3

[0056] This comparative mold is not designed with loading and unloading through holes. The conventional removal method is used when unmolding. The other design and process parameters are the same as those in Example 1. The specific parameters are shown in Table 1. Other parameters and processes not listed are the same as those in Example 1.

[0057] Comparative Example 4

[0058] The comparative sealing process adopts single-peak sealing. The remaining design and process parameters are the same as those in Example 1. The specific parameters are shown in Table 1. Other parameters and processes not listed are the same as those in Example 1.

[0059] According to the visual inspection requirements for metal housings in Appendix A of GJB2440B-2024 "General Specification for Hybrid Integrated Circuit Housings", the connectors prepared in Examples 1-4 and Comparative Examples 1-4 were subjected to performance tests. The test results are shown in Table 2 below: Table 2

[0060] Note: In Table 2, the yield rate of 96% can be interpreted as 96 out of 100 products being qualified; similarly, the lead wire misalignment rate of 35% can be interpreted as 35 out of 100 products having misaligned leads.

[0061] Finished product yield % = (Number of qualified products / Total number of products) × 100%.

[0062] As can be seen from the test results in Table 2, the metal packaging shells in Examples 1-4 showed no glass cracks, lead wire misalignment, or other defects, and their airtightness was ≤1×10⁻⁶. -3 Pa cm 3 / s (A4 He). In Comparative Example 1, the lead wire misalignment rate was 35%; in Comparative Example 2, the lead wire misalignment rate was 21%; in Comparative Example 3, the glass cracking rate was 24%; and in Comparative Example 4, the glass cracking rate was 56%. Example 1 had the highest yield, reaching over 93%, while the yields of Comparative Examples 1-4 were 65%, 79%, 76%, and 0%, respectively.

[0063] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stainless steel multi-core connector with an airtight seal, characterized in that: The connector is made by assembling a stainless steel shell (1), several high-temperature resistant leads (2) and several microcrystalline glass insulating media (3) through a sealing mold and then sealing it at a sealing temperature of over 980°C. The stainless steel shell (1) has several through holes, through which the high-temperature resistant leads (2) pass and are sealed and fixed with the through holes by the microcrystalline glass insulating media (3).

2. The stainless steel multi-core connector with an airtight seal according to claim 1, characterized in that: The microcrystalline glass insulating medium (3) is made by pressing, debinding and vitrification of glass powder in sequence; the expansion coefficient of the microcrystalline glass insulating medium (3) is 11ppm / ℃~22ppm / ℃.

3. A stainless steel multi-core connector with an airtight seal according to claim 1, characterized in that: The high-temperature resistant lead (2) is one of the following: hexa-copper alloy, 304L stainless steel, 316L stainless steel and Hastelloy.

4. A stainless steel multi-core connector with an airtight seal according to claim 1, characterized in that: The sealing mold is made of stainless steel and includes a lower sealing mold (5) and an upper sealing mold (4). The lower sealing mold (5) is provided with a countersunk platform (6) and a lower lead positioning hole (7) located in the countersunk platform (6). The countersunk platform (6) is adapted to the shape of the stainless steel shell (1). The inner cavity size of the countersunk platform (6) is 0.05 mm to 0.1 mm larger than the outer size of the stainless steel shell (1) to form a clearance fit. The upper sealing mold (4) is provided with an upper lead positioning hole (8) corresponding to the sealing through hole of the shell. The upper lead positioning hole (8) and the lower lead positioning hole (7) are both set to correspond one-to-one with the through hole. The diameter of the upper lead positioning hole (8) and the diameter of the lower lead positioning hole (7) are both 0.01 mm to 0.05 mm larger than the outer diameter of the high temperature resistant lead wire (2).

5. A stainless steel multi-core connector with an airtight seal according to claim 4, characterized in that: Both the lower sealing mold (5) and the upper sealing mold (4) are provided with loading and unloading through holes (9); both ends of the lower sealing mold (5) are provided with hand grip slots (10).

6. A stainless steel multi-core connector with an airtight seal according to claim 1, characterized in that: The stainless steel shell (1) and the high-temperature resistant lead wire (2) are both pretreated before sealing; the pretreatment includes cleaning, annealing and oxidation in sequence.

7. A method for manufacturing a stainless steel multi-core connector with an airtight seal as described in any one of claims 1-6, characterized in that, The specific steps are as follows: S1: Set the temperature of the tube furnace. The temperature is set according to the high temperature sealing temperature of the microcrystalline glass insulating medium (3). After the furnace temperature stabilizes, the tube furnace is calibrated in stages to obtain the corresponding position of the quartz crystallization temperature T3 in the tube furnace. S2: Set the temperature of the tube furnace. The temperature is set according to the crystallization temperature of the microcrystalline glass insulating medium (3). After the furnace temperature stabilizes, the tube furnace is calibrated in stages to obtain the corresponding position of the phase change temperature T4 in the tube furnace. S3: Set the tube furnace temperature to the high-temperature sealing temperature T1. After the temperature stabilizes, install the connector in the sealing mold, and then send the assembled assembly to the tube furnace for high-temperature sealing and keep it at the sealing temperature T1. S4: After the heat preservation is completed, the assembly is sent to the quartz crystallization temperature T3 position for cooling and heat preservation according to the calibrated temperature. The cooling rate is 50℃ / min~150℃ / min. S5: Set the temperature of the tube furnace to the crystallization temperature. After the temperature stabilizes, send the product into the tube furnace and heat it to the growth temperature of the cristobalite phase T2. Then keep it warm until the microcrystalline glass insulating medium (3) grains grow. S6: After step S5 is completed, the assembly is sent to the phase change temperature T4 position to cool down to the phase change temperature T4 according to the calibrated temperature. S7: After step S6, cool to room temperature at a rate of 5℃ / min to 40℃ / min.

8. A method for manufacturing a stainless steel multi-core connector with an airtight seal according to claim 7, characterized in that: In step S3, the sealing temperature T1 is equal to the glass viscosity of 10. 4 ~10 5 The temperature is set at 10 Pa·s, and the holding time is 10–20 minutes.

9. A method for manufacturing a stainless steel multi-core connector with an airtight seal according to claim 7, characterized in that: The heat preservation time in step S4 is 30 to 40 minutes.

10. A method for manufacturing a stainless steel multi-core connector with an airtight seal according to claim 7, characterized in that: The cooling rate in step S6 is 10℃ / min to 50℃ / min.

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