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CN-122000234-A - Reed-dry tube sealed by multiple reeds at same end and sealing process thereof

CN122000234ACN 122000234 ACN122000234 ACN 122000234ACN-122000234-A

Abstract

The invention discloses a reed pipe sealed at the same end of a plurality of reeds and a sealing process thereof, relating to the technical field of electronic component manufacturing and comprising a glass pipe; the invention discloses a multi-reed assembly, which comprises at least two reeds, a low-temperature medium glass sealing ring, a sealing piece and a sealing piece, wherein the low-temperature medium glass sealing ring is provided with prefabricated through holes which are matched with the multi-reed assembly in number, the low-temperature medium glass sealing ring is sealed at one end of a glass tube, a graphite die is matched with a continuous mesh belt furnace, the production mode of whole plate batch is realized, the efficiency is improved by tens of times compared with that of the traditional single sealing, the special metal pre-oxidation process is introduced before sealing, and annealing is carried out under the protection of nitrogen, so that the chemical bond combination of glass and a metal medium is tighter, the air tightness level is improved to be more than 10-9 cc.P0/min from the traditional 10-8, and the reliability and the service life of a product are greatly improved.

Inventors

  • WEN WEISHAN

Assignees

  • 深圳市海迈士材料技术有限公司

Dates

Publication Date
20260508
Application Date
20260109

Claims (10)

  1. 1. The reed pipe with multiple reeds sealed at the same end is characterized by comprising: A glass tube (1); a multiple reed assembly (2), the multiple reed assembly (2) comprising at least two reeds; The low-temperature medium glass sealing ring (3), wherein the low-temperature medium glass sealing ring (3) is provided with prefabricated through holes with the number matched with that of the multi-reed assemblies (2); a seal (4); The low-temperature medium glass sealing ring (3) is sealed at one end of the glass tube (1), and each reed of the multi-reed assembly (2) respectively penetrates through a prefabricated through hole of the low-temperature medium glass sealing ring (3) and stretches into the glass tube (1); The low-temperature medium glass sealing ring (3) is made of a glass material with softening temperature lower than that of the glass tube (1), and a hot-melting airtight connecting layer is formed between the low-temperature medium glass sealing ring (3) and the multi-reed assembly (2) as well as between the low-temperature medium glass sealing ring and the inner wall of the glass tube (1).
  2. 2. The reed pipe sealed at the same end of a plurality of reeds according to claim 1, wherein the softening temperature of the low-temperature medium glass sealing ring (3) is 80-100 ℃ lower than the softening temperature of the glass pipe (1); The thermal expansion coefficient of the low-temperature medium glass sealing ring (3) is matched with that of the multi-reed assembly (2), and the numerical range is 8.5-9.5 PPM.
  3. 3. The reed pipe sealed at the same end of a plurality of reeds according to claim 1, wherein the reed assembly (2) comprises two or three reeds, and the reeds are uniformly distributed along the circumference of the low-temperature medium glass sealing ring (3); the aperture of the prefabricated through holes is 0.5-3 mm, and the center distance between adjacent prefabricated through holes is 0.5-2 mm.
  4. 4. The reed pipe sealed at the same end of a plurality of reeds according to claim 1, wherein the surface of the reeds in the hot-melt airtight connecting layer is provided with a metal pre-oxidation layer, and the air tightness level of the reed pipe is not lower than 10-9 cc.P0/min.
  5. 5. A process for sealing a reed pipe sealed at the same end of a plurality of reeds according to any one of claims 1 to 4, wherein a continuous production mode is adopted, comprising the following steps: S1, assembling and positioning, namely correspondingly penetrating a multi-reed assembly (2) through a prefabricated through hole of a low-temperature medium glass sealing ring (3), and assembling the multi-reed assembly and a sealing piece (4) at two ends of a glass tube (1) together to form an assembly to be sealed; S2, loading the jig, namely loading a plurality of to-be-sealed assemblies into a graphite precise positioning jig in batches, and limiting the axial and radial positions of the to-be-sealed assemblies by using the jig; S3, continuous heat treatment, namely continuously feeding the graphite precise positioning jig loaded with the components to be sealed into a continuous sealing furnace filled with protective gas, and sequentially passing through a pre-oxidation temperature zone, a sealing temperature zone and an annealing temperature zone; And S4, cooling and discharging, namely cooling the component subjected to heat treatment along with a jig to obtain the reed switch with the same ends sealed by the multiple reeds.
  6. 6. The sealing process according to claim 5, wherein in the step S3, before entering the sealing temperature zone, the multi-reed assembly (2) is subjected to an on-line pre-oxidation treatment in the pre-oxidation temperature zone; The technological parameters of the pre-oxidation temperature zone are that the temperature is 380-420 ℃, the heat preservation time is 25-35 minutes, and the purity of the protective gas is not lower than 99.99%.
  7. 7. The sealing process according to claim 5, wherein in the step S3, the temperature of the sealing temperature zone is set to be the fusion sealing temperature of the low temperature medium glass sealing ring (3) and lower than the softening temperature of the glass tube (1); the specific sealing process parameters are that the temperature is 630-670 ℃, the heat preservation time is 25-35 minutes, and the pressure of the furnace atmosphere is kept at 0.1-0.3 MPa.
  8. 8. A sealing process according to claim 5, wherein in the step S3, the process parameters of the annealing temperature zone are constant temperature 430 ℃ to 470 ℃ for 25 to 35 minutes, and then gradient cooling is performed at a rate of 5 to 10 ℃ per minute.
  9. 9. The sealing process according to claim 5, wherein a positioning groove matched with the outer diameter of the glass tube (1) is formed in the graphite precise positioning jig, the dimensional tolerance of the positioning groove is controlled within +/-0.02 mm, and the inner wall of the positioning groove is coated with a high-temperature-resistant lubricating coating.
  10. 10. The sealing process according to claim 5, wherein the shielding gas is nitrogen, and the reed switch is removed from the sealing furnace after being cooled to below 50 ℃ along with the jig in step S4.

Description

Reed-dry tube sealed by multiple reeds at same end and sealing process thereof Technical Field The invention relates to the technical field of electronic component manufacturing, in particular to a reed switch with multiple reeds sealed at the same end and a sealing process thereof. Background The reed switch (REED SWITCH) is used as a physical switch with wide application scene and high reliability, and plays an important role in the fields of communication, security, medical treatment, automobile electronics and the like. The traditional reed switch structure is generally composed of a glass tube, a fixed reed and a movable reed, and the manufacturing process mainly adopts a flame or laser heating mode. Specifically, the two ends of the glass tube are heated at a local high temperature in an environment filled with inert gas (such as nitrogen) so that the glass is melted and sealed with the metal reed, thereby forming the airtight package. However, the existing conventional sealing technology has significant defects and shortcomings: First, the production efficiency is low. The traditional mode generally adopts a single assembly, positioning, sealing and annealing process, the average time consumption of the whole process is about 30 seconds per unit time, and the large-scale continuous automatic production is difficult to realize, so that the manufacturing cost is high. Second, the level of hermeticity is limited. Because of adopting an instantaneous welding mode of directly carrying out flame or laser heating on two ends of the glass tube, the metal reed does not need to carry out sufficient pre-oxidation treatment. According to the theory and practice of glass and metal sealing, the bonding force of the interface of the metal and glass sealing without pre-oxidation is weak, the air tightness grade is generally lower than 10-8 cc.P0/min, the sealing belongs to the general grade, and the requirement of high-end precise instruments on high reliability is difficult to meet. Again, the structural limitations are large. It is difficult to achieve simultaneous sealing of two or more leaves at the same end by conventional processes. This is because the softening flow of the end portion of the glass tube is difficult to control precisely when heated by flame or laser, and if a plurality of reeds are inserted into the same end, the reeds are liable to have uncontrolled spacing, short circuit or uneven cladding of glass, and the consistency of the product cannot be ensured. Therefore, a reed pipe with multiple reeds sealed at the same end and a sealing process thereof are provided. Disclosure of Invention The invention aims to provide a reed pipe with multiple reeds sealed at the same end and a sealing process thereof. Solves one of the technical problems that the production efficiency is low, the air tightness is poor and the same-end sealing of a plurality of reeds can not be realized in the prior art. In order to solve the technical problems, the application adopts a technical scheme that the reed switch with the same ends of the plurality of reeds is sealed and connected comprises: a glass tube; a multiple reed assembly comprising at least two reeds; The low-temperature medium glass sealing ring is provided with prefabricated through holes which are matched with the multiple reed assemblies in number; a seal; The low-temperature medium glass sealing ring is sealed at one end of the glass tube, and each reed of the multi-reed assembly respectively penetrates through the prefabricated through hole of the low-temperature medium glass sealing ring and stretches into the glass tube; the low-temperature medium glass sealing ring is made of a glass material with softening temperature lower than that of the glass tube, and a hot-melting airtight connecting layer is formed between the low-temperature medium glass sealing ring, the multi-reed assembly and the inner wall of the glass tube. Further preferably, the softening temperature of the low-temperature medium glass sealing ring is 80-100 ℃ lower than the softening temperature of the glass tube; the thermal expansion coefficient of the low-temperature medium glass sealing ring is matched with that of the multi-reed assembly, and the numerical range is 8.5-9.5 PPM. Further preferably, the multi-reed assembly comprises two or three reeds, and the reeds are uniformly distributed along the circumference of the low-temperature medium glass sealing ring; the aperture of the prefabricated through holes is 0.5-3 mm, and the center distance between adjacent prefabricated through holes is 0.5-2 mm. Further preferably, the surface of the reed, which is positioned in the hot-melt airtight connecting layer, is provided with a metal pre-oxidation layer, and the air tightness level of the reed pipe is not lower than 10-9 cc.P0/min. The second aspect is a sealing process of the reed pipe sealed at the same end of a plurality of reeds, adopting a continuous production mode, comprisi