Aluminum alloy airtight packaging connector and manufacturing method thereof

Abstract

The invention discloses an aluminum alloy airtight packaging connector and a manufacturing method. The connector mainly comprises a shell, a base, a contact pin and sealing glass. The contact pin is sintered and sealed in the base through sealing glass, and the base is installed in the shell; the base is fixedly connected with the shell through a fastening bolt; the shell is made of aluminum or aluminum alloy, the base is made of stainless steel, and the contact pins are made of iron-nickel alloy. According to the invention, the housing adopts an aluminum alloy housing, the pressure-bearing part base adopts a stainless steel structure, and the housing and the pressure-bearing part base are fixed by adopting a sealing ring and a fastening bolt, so that the problems of poor pressure-bearing performance of aluminum alloy glass metal sealing, heavy weight of a stainless steel structure and the like are ingeniously solved, and the effects of reducing the weight and realizing high pressure bearing can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical connectors, and in particular to an aluminum alloy hermetic sealed connector and a manufacturing method thereof. Background Art

[0002] At present, the field of electrical connectors is widely used in aerospace, aviation, automobiles, ships and other fields, with a high market share and a large supply of products. The connector used in the ignition device is one of the important components in the rocket engine, and its reliability directly determines the success or failure of the missile launch mission. This connector is generally used in the head or tail of the solid rocket engine. When the missile is launched, the inside of the connector will be subjected to huge air pressure, up to 30MPa. Therefore, whether the air tightness and pressure resistance of the connector are qualified will determine the success or failure of the launch mission.

[0003] Currently, this type of connector is made of stainless steel, which is heavier than aluminum alloy. Patent CN112499994A discloses an aluminum alloy shell and nickel alloy core column connector sealed with low-temperature glass. The aluminum alloy shell and nickel alloy core column connector sealed with low-temperature glass is a connector composed of a metal shell, a metal core column and a low-temperature glass material between the two. The low-temperature glass used in this connector is a phosphate glass system, which has much lower chemical stability and strength than the silicate system, and does not have high pressure resistance in practical applications. Summary of the invention

[0004] The outer shell is made of aluminum alloy, and the base of the pressure-bearing part is made of stainless steel structure. The two are fixed with sealing rings and fastening bolts, which cleverly solves the problems of poor pressure-bearing performance of aluminum alloy glass-metal sealing and heavy weight of stainless steel structure, achieving the effect of reducing weight while achieving high pressure-bearing effect.

[0005] The technical solution adopted by the present invention to solve the technical problem is: an aluminum alloy hermetic sealed connector, the connector mainly includes a shell, a base, a pin and a sealing glass; the pin is sealed in the base by sintering the sealing glass, and the base is installed in the shell; the base and the shell are fixedly connected by fastening bolts; the shell material is aluminum or aluminum alloy, the base material is stainless steel, and the pin material is iron-nickel alloy.

[0006] Furthermore, in terms of molar percentage, the composition of the sealing glass is: 50-60 mol% of silicon dioxide, 15-20 mol% of boron trioxide, 3-5 mol% of aluminum trioxide, 4-8 mol% of sodium oxide, 4-8 mol% of potassium oxide, 0-4 mol% of calcium oxide, 0-6 mol% of barium oxide, and 0.5-2 mol% of cobalt oxide.

[0007] Furthermore, the thermal expansion coefficient of the base is greater than that of the sealing glass, the thermal expansion coefficient of the sealing glass is close to that of the pin, and the sintering between the base and the sealing glass is a compression seal with higher sealing strength.

[0008] Furthermore, the base and the shell are externally plated with nickel, and the pins are externally plated with gold.

[0009] Furthermore, a sealing groove 1 is provided on the periphery of the base, and a sealing groove 2 is opened at a corresponding position in the shell; the space between the sealing groove 1 and the sealing groove 2 is used for installing a sealing ring.

[0010] Furthermore, a sealing gasket 1 is provided between the fastening bolt and the base; and a sealing gasket 2 is provided below the base in the shell.

[0011] Furthermore, a step is provided at the bottom of the inner cavity of the shell, and the step serves to limit the base; a thread is provided at the top of the inner cavity of the shell, and the thread is installed in cooperation with a fastening bolt.

[0012] A method for manufacturing an aluminum alloy hermetic sealed connector, the manufacturing method mainly comprising the following steps:

[0013] Step 1), the shell is made of aluminum or aluminum alloy, the base is made of stainless steel, and the pin is made of iron-nickel alloy. The base and the pin are sealed and connected by sintering the sealing glass to form a compression seal;

[0014] Step 2: Nickel-plating the surface of the shell, nickel-plating the surface of the base, and gold-plating the surface of the pin;

[0015] Step 3: Install the sealing gasket 1 on the upper part of the base, and install the sealing ring in the sealing groove outside the base;

[0016] Step 4: Install the base into the housing, then install the fastening nut to fix the base inside the housing, and then install the second sealing gasket at the bottom of the housing.

[0017] Furthermore, in step 1), the sealing glass is first loaded into the through hole of the base and positioned by a sintering mold; then the pin is passed through the through hole on the sealing glass, and after high-temperature sintering, the pin and the base are fixedly connected by the sealing glass.

[0018] The beneficial effects of the present invention are as follows: compared with the prior art, the present invention provides an aluminum alloy hermetic connector and a method for making the same. Structurally, the outer shell of the connector of the present invention adopts an aluminum alloy shell with an aluminum alloy density of 2.68, and the pressure-bearing base is made of a stainless steel structure with a stainless steel density of 7.93. The aluminum alloy hermetic connector is about 66% lighter than the stainless steel hermetic connector. The base and the pin are sealed with glass compression, and the two are fixed with a sealing ring and a fastening bolt, and two upper and lower sealing pads are also provided, which solves the problems of poor pressure-bearing performance of aluminum alloy glass-metal sealing and heavy weight of stainless steel structure. The pressure-bearing performance of traditional aluminum alloy hermetic connectors does not exceed 5MPa, while the pressure-bearing performance of stainless steel hermetic connectors can reach 30MPa. This patent combines the advantages of two metal materials through structural design to prepare an aluminum alloy high-pressure hermetic connector.

[0019] In terms of materials, the sealing glass of the present invention adopts a silicate system and adds CoO. Co, Fe and Ni belong to the fourth period and eighth group in the periodic table, have similar electron layers and similar chemical properties. When CoO is introduced into the glass, a Si-O-Co bond can be formed. During the sealing process with the metal, the oxygen vacancies of the Si-O bonds in the glass and the Fe-O bonds and Ni-O in the metal will form bond bridges through Co, thereby improving the interfacial bonding force between the metal and the glass. Compared with the phosphate glass system, it has better chemical stability, sealing strength and compressive strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a connector provided by the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the housing in the connector provided by the present invention;

[0022] Figure 3 It is a structural schematic diagram of a base in a connector provided by the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the pins in the connector provided by the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the sealing glass in the connector provided by the present invention;

[0025] Figure 6 It is a structural schematic diagram of a fastening bolt in a connector provided by the present invention;

[0026] In the figure: 1-fastening bolts, 2-housing, 3-base, 4-mounting end plate, 5-sealing glass, 6-pin, 7-sealing gasket 1, 8-sealing ring, 9-sealing gasket 2; 10-sealing groove 1, 11-sealing groove 2, 12-step. DETAILED DESCRIPTION

[0027] The present invention is further described below by specific examples, but these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0028] Example

[0029] like Figures 1 to 6 As shown, an aluminum alloy hermetic sealed connector, the connector mainly includes a shell 2, a base 3, a pin 6 and a sealing glass 5; the pin 6 is sintered and sealed in the base 3 by the sealing glass 5, and the base 3 is installed in the shell 2; the base 3 and the shell 2 are fixedly connected by a fastening bolt 1; the shell 2 is made of aluminum or aluminum alloy, the base 3 is made of stainless steel, and the pin 6 is made of iron-nickel alloy.

[0030] In terms of molar percentage, the composition of the sealing glass is: 50-60 mol% of silicon dioxide, 15-20 mol% of boron trioxide, 3-5 mol% of aluminum trioxide, 4-8 mol% of sodium oxide, 4-8 mol% of potassium oxide, 0-4 mol% of calcium oxide, 0-6 mol% of barium oxide, and 0.5-2 mol% of cobalt oxide. In this embodiment, the composition of the sealing glass is: 56 mol% of silicon dioxide, 18 mol% of boron trioxide, 4 mol% of aluminum trioxide, 6 mol% of sodium oxide, 6 mol% of potassium oxide, 3 mol% of calcium oxide, 5 mol% of barium oxide, and 2 mol% of cobalt oxide.

[0031] In this embodiment, the thermal expansion coefficient of the base 3 is greater than the thermal expansion coefficient of the sealing glass 5, and the thermal expansion coefficient of the sealing glass 5 is close to the thermal expansion coefficient of the pin 6. -7 / ℃, the thermal expansion coefficient of sealing glass is 90~105×10 -7 / ℃, the thermal expansion coefficient of the pin is 90×10 -7 / °C. The sintering between the base 3 and the sealing glass 5 is compression sealing, which has higher sealing strength.

[0032] In this embodiment, the base 3 and the housing 2 are externally plated with nickel, and the pin 6 is externally plated with gold.

[0033] In this embodiment, a sealing groove 10 is provided on the periphery of the base 3 , and a sealing groove 2 11 is provided at a corresponding position in the housing 2 ; the space between the sealing groove 10 and the sealing groove 2 11 is used to install the sealing ring 8 .

[0034] In this embodiment, a sealing gasket 7 is provided between the fastening bolt 1 and the base 3 ; a sealing gasket 2 9 is provided below the base 3 in the housing 2 .

[0035] In this embodiment, a step 12 is provided at the bottom of the inner cavity of the shell 2 , and the step 12 serves to limit the base 3 ; a thread is provided at the top of the inner cavity of the shell 2 , and the thread is installed in cooperation with the fastening bolt 1 .

[0036] A method for manufacturing an aluminum alloy hermetic sealed connector, the manufacturing method mainly comprising the following steps:

[0037] Step 1), the housing 2 is made of aluminum or aluminum alloy, the base 3 is made of stainless steel, and the pin 6 is made of iron-nickel alloy, and the base 3 and the pin 6 are sealed and connected by sintering the sealing glass 5 to form a compression seal;

[0038] Step 2: nickel-plating the surface of the housing 2, nickel-plating the surface of the base 3, and gold-plating the surface of the pin 6;

[0039] Step 3: Install the sealing gasket 7 on the upper part of the base 3, and install the sealing ring 8 on the sealing groove 10 outside the base 3;

[0040] Step 4: Install the base 3 into the housing 2, then install the fastening nut 1 to fix the base 3 inside the housing 2, and then install the sealing gasket 9 at the bottom of the housing 2.

[0041] Among them, in step 1), the sealing glass 5 is first loaded into the through hole of the base 3 and positioned by the sintering mold; then the pin 6 is passed through the through hole on the sealing glass 5, and after high-temperature sintering, the pin 6 and the base 3 are fixedly connected by the sealing glass 5. The high-temperature sintering is carried out in an atmosphere chain furnace, the sintering temperature is 960℃±10℃, the time is 5-20min, and the pressure is 10-100kPa.

[0042] Performance Testing:

[0043] The aluminum alloy connector prepared in this embodiment and the conventional aluminum alloy connector are placed on the air pressure test fixture for air pressure testing, and the pressure can reach up to 30MPa. The chemical stability refers to "GB / T 6582-2021 Glass Glass Particles Water Resistance Test Method and Classification at 98°C". The air tightness is tested using a helium mass spectrometer leak detector.

[0044] In the preparation of conventional aluminum alloy connectors, the same connector structure is adopted, the metal material is aluminum alloy, and the sealing glass is phosphate system glass. After assembly, the sealing is performed at 500-550°C.

[0045] The test results are shown in Table 1 below:

[0046]

[0047] The above implementation modes are only used to illustrate the present invention, but not to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention should be defined by the claims.

Claims

1. An aluminum alloy hermetic sealed connector, characterized in that: The connector mainly comprises a housing (2), a base (3), a plug pin (6) and a sealing glass (5); the plug pin (6) is sintered and sealed in the base (3) by the sealing glass (5), and the base (3) is installed in the housing (2); the base (3) and the housing (2) are fixedly connected by fastening bolts (1); the housing (2) is made of aluminum or aluminum alloy, the base (3) is made of stainless steel, and the plug pin (6) is made of iron-nickel alloy.

2. The aluminum alloy hermetic sealed connector according to claim 1, characterized in that: In terms of molar percentage, the sealing glass is composed of 50-60 mol% silicon dioxide, 15-20 mol% boron trioxide, 3-5 mol% aluminum trioxide, 4-8 mol% sodium oxide, 4-8 mol% potassium oxide, 0-4 mol% calcium oxide, 0-6 mol% barium oxide, and 0.5-2 mol% cobalt oxide.

3. The aluminum alloy hermetic sealed connector according to claim 1, characterized in that: The thermal expansion coefficient of the base (3) is greater than the thermal expansion coefficient of the sealing glass (5), the thermal expansion coefficient of the sealing glass (5) is close to the thermal expansion coefficient of the plug pin (6), and the sintering between the base (3) and the sealing glass (5) is a compression seal, which has a higher sealing strength.

4. The aluminum alloy hermetic sealed connector according to claim 1, characterized in that: The base (3) and the housing (2) are nickel-plated on the outside, and the plug pin (6) is gold-plated on the outside.

5. The aluminum alloy hermetic sealed connector according to claim 1, characterized in that: A sealing groove 1 (10) is provided on the periphery of the base (3), and a sealing groove 2 (11) is provided at a corresponding position in the housing (2); the space between the sealing groove 1 (10) and the sealing groove 2 (11) is used for installing a sealing ring (8).

6. The aluminum alloy hermetic sealed connector according to claim 1, characterized in that: A sealing gasket 1 (7) is provided between the fastening bolt (1) and the base (3); and a sealing gasket 2 (9) is provided below the base (3) inside the housing (2).

7. The aluminum alloy hermetic sealed connector according to claim 1, characterized in that: The bottom of the inner cavity of the shell (2) is provided with a step (12), and the step (12) serves to limit the base (3); the top of the inner cavity of the shell (2) is provided with a thread, and the thread is installed in cooperation with the fastening bolt (1).

8. The method for manufacturing an aluminum alloy hermetic package connector according to claim 1, characterized in that: The production method mainly comprises the following steps: Step 1), the housing (2) is made of aluminum or aluminum alloy, the base (3) is made of stainless steel, and the plug pin (6) is made of iron-nickel alloy, and the base (3) and the plug pin (6) are sealed and connected by sintering the sealing glass (5) to form a compression seal; Step 2: nickel-plating the surface of the housing (2), nickel-plating the surface of the base (3), and gold-plating the surface of the pin (6); Step 3: Install the sealing gasket 1 (7) on the upper part of the base (3), and install the sealing ring (8) on the sealing groove 1 (10) outside the base (3); Step 4: Install the base (3) into the housing (2), then install the fastening nut (1) to fix the base (3) inside the housing (2), and then install the second sealing gasket (9) at the bottom of the housing (2).

9. The method for manufacturing an aluminum alloy hermetic package connector according to claim 8, characterized in that: In step 1), the sealing glass (5) is first inserted into the through hole of the base (3) and positioned by a sintering mold; then the pin (6) is passed through the through hole on the sealing glass (5), and after high-temperature sintering, the pin (6) and the base (3) are fixedly connected by the sealing glass (5).

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