Electrode assembly for a carbon dioxide laser tube

Abstract

The utility model discloses a kind of electrode assemblies for carbon dioxide laser tube, including glass tubular electrode mounting seat integrally fired on glass tube shell and inserted installation valve alloy metal electrode;The inner wall of electrode mounting seat upper end is equipped with inner taper hole, metal electrode middle part has round table shape sealing section, its outer taper surface is precisely matched with inner taper hole, and vacuum sealing adhesive layer is equipped in the surface of sticking;After laser tube is pumped, the axial thrust generated by atmospheric pressure makes round table shape sealing section and taper compact, realize the self-reinforced sealing of "more suction more tight";The exposed end of metal electrode is equipped with center inner thread hole, power line is fixed by wiring bolt cooperation wiring nose, connection is firm and installation maintenance is convenient;The utility model is improved through tubular sintering seat, taper self-tight sealing and inner thread wiring structure, simplifies firing process, avoids glass cracking, improves sealing reliability and assembly stability, prolongs the service life of laser.

Description

Technical Field

[0001] This utility model relates to the field of laser manufacturing technology, and in particular to an improvement of an electrode assembly for a sealed carbon dioxide laser. Background Technology

[0002] In sealed carbon dioxide laser tubes, the sealing and connection reliability of the electrode assembly directly affect the laser's performance and lifespan. Early carbon dioxide laser electrodes often used tungsten rods directly sintered and sealed to a borosilicate glass tube at high temperatures. This method requires extremely high precision in glassworking processes and is prone to internal stress due to differences in thermal expansion coefficients, leading to glass cracking or chronic gas leakage. Furthermore, tungsten rods are easily oxidized at high temperatures, and external wiring is usually done by winding or welding, which can easily loosen or damage the glass seal due to heat from secondary welding.

[0003] In summary, developing an electrode assembly with better sealing and simpler glass processing is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose an electrode assembly for a carbon dioxide laser tube, thereby solving the problems mentioned in the background art.

[0005] To achieve the above technical objectives, the present invention provides an electrode assembly for a carbon dioxide laser tube, comprising: The electrode mounting base is a tubular structure made of glass, integrally fired and connected to the end of the glass tube shell; the inner wall of the electrode mounting base has a conical surface whose diameter gradually decreases towards the inside of the laser body. A metal electrode is inserted and installed inside the electrode mounting base; the middle part of the metal electrode has a frustum-shaped sealing section that mates with the conical surface of the electrode mounting base; the outer conical surface of the frustum-shaped sealing section is in contact with and sealed to the conical surface of the electrode mounting base. The metal electrode has an internal threaded hole at one end located outside the laser body, and a discharge electrode is provided at the other end located inside the laser body.

[0006] Furthermore, a sealant layer is filled between the outer conical surface of the frustum-shaped sealing section and the conical surface of the electrode mounting base.

[0007] Furthermore, the metal electrode is made of a metal material with a coefficient of thermal expansion similar to that of glass, preferably a Kovar alloy.

[0008] Furthermore, the conical surface of the electrode mounting base and the tapered design of the frustum-shaped sealing section ensure that when a vacuum is drawn inside the laser tube to form a negative pressure, the external atmospheric pressure acts on the outside of the metal electrode, generating a component force that pushes the metal electrode into the laser tube, causing the frustum-shaped sealing section to adhere more and more tightly to the conical surface of the electrode mounting base.

[0009] Furthermore, it also includes an external wiring component, which includes a conductive bolt or connector with external threads, which is screwed into the internal threaded hole of the metal electrode to achieve electrical connection and fixation.

[0010] Compared with the prior art, the beneficial effects of this utility model include: 1. This utility model designs the mating surfaces of the electrode and the glass base as frustum / cone shapes. Based on the adhesive bonding and sealing, since the laser tube is under vacuum pressure during operation, the external atmospheric pressure will give the metal electrode an inward thrust, causing the frustum surface of the metal electrode to press tightly against the conical surface of the glass mounting base. This structure achieves a self-tightening sealing effect of "the more it is sucked in, the tighter it becomes", which greatly improves the reliability and long-term stability of the vacuum seal and eliminates air leakage.

[0011] 2. The present invention uses a tubular structure for the electrode mounting base (compared to the flange plane of the prior art), which is more in line with the conventional operating habits of glass lampworkers for the welding and firing process with the glass tube shell. The firing stress is more easily released, reducing the risk of cracking of the glass during the firing and use process. Attached Figure Description

[0012] Figure 1 This is a cross-sectional schematic diagram of an electrode assembly for a carbon dioxide laser tube provided by this utility model. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0014] This invention provides an electrode assembly for a carbon dioxide laser tube, applied to the body of a sealed carbon dioxide laser. The assembly mainly includes a glass electrode mounting base 20 integrally formed on a glass tube shell 10 and a metal electrode 30 inserted into it.

[0015] The glass shell 10 is typically made of borosilicate glass or quartz glass; the electrode mounting base 20 is also made of glass and is in the shape of a short tube. During the manufacturing of the laser glass preform, the tubular electrode mounting base 20 is sintered at high temperature to the end of the glass shell 10 to form an integrated structure.

[0016] A conical surface is machined or fired onto the upper inner wall of the electrode mounting base 20. The diameter of the conical surface gradually decreases along the direction towards the interior of the laser body, forming an inner conical hole seat. The metal electrode 30 is preferably made of Kovar alloy material because its coefficient of thermal expansion matches that of high borosilicate glass, which can reduce the stress caused by temperature changes. The main body of the metal electrode 30 is rod-shaped, with a frustum-shaped sealing section 31 in the middle. The taper of the outer conical surface of the frustum-shaped sealing section 31 is precisely matched with the taper of the conical surface of the electrode mounting base 20.

[0017] During assembly, a vacuum sealant layer (such as a special vacuum epoxy resin adhesive) that is resistant to high vacuum and high temperature is first evenly applied to the outer surface or conical surface of the frustum-shaped sealing section 31. Then, the discharge electrode 33 of the metal electrode 30 (usually designed as a thin rod) is inserted through the electrode mounting base 20 into the glass tube shell 10 to serve as a pre-ignition electrode or main discharge electrode in the laser tube. At this time, the frustum-shaped sealing section 31 falls into and fits onto the conical surface of the electrode mounting base 20, with the gap filled by the vacuum sealant layer.

[0018] After the adhesive cures, a preliminary seal is formed. When the laser tube completes the degassing and is evacuated to a vacuum state, the air pressure inside the tube is much lower than the atmospheric pressure outside the tube. At this time, the atmospheric pressure acts on the exposed end face of the metal electrode 30, generating an inward axial thrust. Due to the presence of the conical mating structure, this thrust causes the metal frustum-shaped sealing section 31 to press more tightly against the conical surface of the electrode mounting base 20, squeezing the vacuum sealing adhesive layer, thereby achieving a self-reinforcing sealing effect of "the more it is sucked, the tighter it becomes". Even if the adhesive layer is slightly aged, the clamping force of the mechanical structure can ensure that there is no air leakage.

[0019] The metal electrode 30 has a central internal threaded hole 32 machined at one end outside the laser body. When wiring, a matching external wiring bolt (which can be a bolt with a pressure plate or a terminal block) is passed through the wiring lug of the power cable and then screwed into the internal threaded hole 32 to tighten. This internal threaded connection method has a compact structure, a very strong connection, and no protruding vulnerable threads on the outside of the metal electrode, making installation and maintenance convenient.

[0020] This embodiment significantly improves the reliability and manufacturability of the carbon dioxide laser tube electrode assembly through comprehensive improvements to the tubular sintering seat, the self-tightening seal of the conical surface, and the internal thread wiring structure.

[0021] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. An electrode assembly for a carbon dioxide laser tube, characterized in that, include: The electrode mounting base (20) is a tubular structure made of glass and integrally fired and connected to the end of the glass tube shell (10); the upper inner wall of the electrode mounting base (20) has a conical surface whose diameter gradually decreases towards the inside of the laser body (1); A metal electrode (30) is installed inside the electrode mounting base (20); the middle part of the metal electrode (30) has a frustum-shaped sealing section (31) that matches the conical surface shape and angle of the electrode mounting base (20); the outer conical surface of the frustum-shaped sealing section (31) is in contact with and sealed to the conical surface of the electrode mounting base (20). The metal electrode (30) has an internal threaded hole (32) along the axial direction at one end outside the laser body, and a discharge electrode (33) is provided at the other end inside the laser body.

2. The electrode assembly for a carbon dioxide laser tube according to claim 1, characterized in that: A sealing layer is provided between the outer conical surface of the frustum-shaped sealing section (31) and the conical surface of the electrode mounting base (20).

3. The electrode assembly for a carbon dioxide laser tube according to claim 1, characterized in that: The conical surface of the electrode mounting base (20) and the frustum-shaped sealing section (31) are configured such that when the laser body (1) is in a vacuum negative pressure state, the axial thrust generated by the external atmospheric pressure acting on the metal electrode (30) causes the frustum-shaped sealing section (31) to press against the conical surface of the electrode mounting base (20) to form a self-tightening seal.

4. An electrode assembly for a carbon dioxide laser tube according to claim 2 or 3, characterized in that: The metal electrode (30) is made of Kovar alloy material.

5. The electrode assembly for a carbon dioxide laser tube according to claim 4, characterized in that: An external wiring bolt is fitted inside the internal threaded hole (32), and the external wiring bolt is used to tighten and fix the power line terminal.

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