Joint structure for inflating and deflating laser gyroscope
The ceramic and corrugated tube seal structure for laser gyroscopes addresses connection issues by providing a strong, easy-to-assemble connection that prevents leakage and contamination, ensuring the integrity of the vacuum chamber.
Patent Information
- Application Number
- CN202422406737.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-30
AI Technical Summary
The connection method between the existing laser gyro and the vacuum exhaust table has problems such as high-temperature hydrogen-oxygen welding safety hazards, the risk of fragile and leakage of glass tubes, and the squeezer or VCR joints are prone to damage indium seals and contaminated cavity. Conventional sealing methods are not suitable for laser gyro charging and exhaust.
The joint structure of ceramic tube and corrugated tube is adopted, combined with the improved KF flange and metal sealing ring, sealing connection is achieved through axial force to avoid shear damage and contamination, and clamping is used to easily disassemble.
It realizes high-strength and convenient sealing connection, avoids fragility of glass tubes, shear damage and cavity contamination, and improves the measurement accuracy and safety of laser gyroscopes.
Smart Images
Figure CN223106968U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of laser gyro preparation, and particularly relates to a joint structure for charging and exhausting air of a laser gyro. Background Art
[0002] During the production process of a laser gyro, it is necessary to connect its internal cavity with a high-vacuum exhaust table 100 for vacuum pumping and gas filling operations. In the traditional method, the laser gyro and the vacuum exhaust table 100 are connected by glass fusion welding to achieve insulated ventilation connection. As Figure 1 shown, the laser gyro 200 is connected to the vacuum exhaust table 100 through a quartz tube 300, and the quartz tube 300 mainly plays an insulating role. The vacuum exhaust table 100 and the glass tube part are transitioned by using kovar materials, that is, the vacuum exhaust table 100 is connected to a first kovar alloy tube 500 through a first CF flange 400, the first kovar alloy tube 500 is fused with the quartz tube 300, and the gyro and the glass tube are connected by fusion welding, that is, the quartz tube 300 is fused with a second kovar alloy tube 600, and the second kovar alloy tube 600 is welded to the extraction anode 201, so that the extraction anode 201 forms an insulated isolation conduction tube. This process requires high-temperature oxyhydrogen welding and fusion, with poor operability, potential safety hazards, and easy contamination of the cavity. In addition, vibrations and the like occurring during the operation of the exhaust table will cause risks such as glass fragmentation and air leakage. Moreover, the second kovar alloy tube 600 is rigidly connected to the extraction anode 201, which easily causes risks such as air leakage due to the shearing force on the sealing part of the extraction anode 201. In recent years, great improvements have been made in the connection between laser gyros and vacuum tables at home and abroad. By relying on ferrule or VCR joints, etc., cold sealing between the laser gyro and the exhaust table has been achieved. However, when the ferrule or VCR joint is tightened, there is still a shearing force at the extraction nozzle when the ferrule is rotated, which will still cause a risk of air leakage and there is a certain operation difficulty.
[0003] High-vacuum detachable seals usually adopt knife-edge flanges, KF flanges or ferrule VCR seal methods. The knife-edge flange realizes sealing by pressing an oxygen-free copper gasket through the knife-edge on the flange end face, which requires a large clamping force and usually needs to be fixed by multiple screws. If applied to the sealed connection between a laser gyro and a vacuum exhaust table, not only is it difficult to process the knife-edge of the extraction anode of the laser gyro, but also the knife-edge flange is difficult to disassemble; the laser gyro and the extraction anode are connected by indium sealing, and this kind of sealing is very weak in resisting shearing force. If a ferrule VCR seal is adopted, the torque of the locking thread during sealing will damage the indium seal of the extraction anode of the indium seal. And the common KF sealing ring structure is usually fluororubber, which is an organic material and will release impurity gases when heated or used in a high vacuum, which will then contaminate the laser gyro cavity and cause a decrease in the measurement accuracy of the laser gyro. Therefore, these conventional seal methods are not suitable for the joint seal of laser gyro charging and exhausting. Summary of the Utility Model
[0004] In view of the problems in the background art, the present utility model proposes a joint structure for charging and exhausting a laser gyroscope, which has high strength, is convenient to install and disassemble, and will not damage the indium seal of the laser gyroscope or contaminate the cavity of the laser gyroscope.
[0005] The present utility model adopts the following technical solutions:
[0006] A joint structure for charging and exhausting a laser gyroscope includes a ceramic tube, a bellows, and a sealing structure. One end of the ceramic tube is connected to one end of the bellows. The other end of the ceramic tube is used to be hermetically connected to a vacuum exhaust table. The sealing structure is arranged at the other end of the bellows. The sealing structure includes a first flange joint arranged at the other end of the bellows, a second flange joint arranged at the air extraction positive end of the laser gyroscope, a clamp for clamping the first flange joint and the second flange joint, and a metal sealing ring arranged between the first flange joint and the second flange joint. Knife-edge structures are arranged at both ends of the metal sealing ring in the axial direction. While the clamp clamps the first flange joint and the second flange joint, the knife-edge structures at both ends of the metal sealing ring in the axial direction are clamped into the end faces of the corresponding flange joints, so that the first flange joint and the second flange joint are hermetically connected through the metal sealing ring.
[0007] Preferably, both ends of the metal sealing ring in the axial direction extend towards the end faces of the corresponding flange joints respectively until knife-edge structures with a sharp-corner cross-section are formed.
[0008] Preferably, one end of the ceramic tube and one end of the bellows are connected through a third kovar alloy tube.
[0009] Preferably, the clamp is a chain clamp.
[0010] Preferably, the bellows is a butterfly bellows.
[0011] Preferably, the material of the bellows is stainless steel.
[0012] Preferably, the material of the metal sealing ring is oxygen-free copper or aluminum.
[0013] Preferably, the other end of the ceramic tube is hermetically connected to the vacuum exhaust table through a second CF flange.
[0014] Preferably, a fourth kovar alloy tube is also connected between the second CF flange and the ceramic tube.
[0015] Compared with the prior art, the advantages of the present utility model are as follows:
[0016] The joint structure for charging and exhausting air of a laser gyroscope in the present utility model adopts a joint method of a ceramic tube + bellows. The bellows is hermetically connected to the cavity of the laser gyroscope through an improved KF flange. The ceramic tube plays a role of insulating connection. Moreover, the ceramic tube has higher strength than a glass tube, solving the problem of fragility of the conventional glass tube in fusion sealing. The bellows has excellent elasticity, reducing the problem of rigid connection existing in the conventional high-vacuum detachable seal. The improved KF flange includes a first flange joint connected to the bellows, a second flange joint arranged at the pumping anode end of the laser gyroscope, a clamp for clamping the two, and a metal sealing ring located between the two. Both ends of the metal sealing ring in the axial direction have knife edges. When the clamp clamps the first flange joint and the second flange joint, the knife edge structures at both ends of the metal sealing ring in the axial direction are clamped into the end faces of the corresponding flange joints, so that the first flange joint and the second flange joint are hermetically connected through the metal sealing ring. It can be seen that the above-mentioned improved KF flange sealing structure and the sealing connection process mainly rely on axial force, thus avoiding the risk of damage to the indium seal of the pumping anode caused by large shear force during the conventional ferrule VCR seal connection process, and also avoiding the problem of impurity gas release from fluororubber in the conventional KF flange seal, which causes pollution to the cavity of the laser gyroscope. In addition, since the knife edges are processed on the sealing ring and the joint is clamped by a clamp, the problems of difficult processing and difficult disassembly of the conventional knife-edge flange are also avoided. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] To make it easier to understand the present utility model, the present utility model will be described in more detail by referring to the specific embodiments shown in the accompanying drawings. These drawings only depict the typical embodiments of the present utility model and should not be considered as a limitation to the protection scope of the present utility model.
[0018] Figure 1 The application state schematic diagram of the joint structure for charging and exhausting air of a laser gyroscope in the prior art.
[0019] Figure 2 The application state schematic diagram of the joint structure for charging and exhausting air of a laser gyroscope in the embodiment of the present utility model.
[0020] Figure 3 The structural schematic diagram of the joint structure for charging and exhausting air of a laser gyroscope in the embodiment of the present utility model.
[0021] Figure 4 The partial sectional structural schematic diagram of the improved KF flange in the embodiment of the present utility model.
[0022] Figure 5 The three-dimensional structural schematic diagram of the metal sealing ring in the embodiment of the present utility model.
[0023] Figure 6Schematic diagram of the structure of the chain clamp according to the embodiment of the present utility model.
[0024] Figure 7 Schematic diagram of the structure of the air extraction anode according to the embodiment of the present utility model.
[0025] Reference numerals:
[0026] 100, vacuum exhaust table; 200, laser gyro; 201, air extraction anode; 300, quartz tube; 400, first CF flange; 500, first kovar alloy tube; 600, second kovar alloy tube; 1, ceramic tube; 2, bellows; 3, first flange joint; 4, second flange joint; 5, clamp; 6, metal sealing ring; 61, knife-edge structure; 7, third kovar alloy tube; 8, second CF flange; 9, fourth kovar alloy tube. Detailed implementation manners
[0027] The following describes the implementation manners of the present utility model with reference to the drawings, so that those skilled in the art can better understand the present utility model and implement it. However, the listed embodiments are not intended to limit the present utility model. Without conflict, the following embodiments and the technical features in the embodiments can be combined with each other, and the same components are denoted by the same reference numerals.
[0028] As Figures 2 - 7 shown, the joint structure for charging and exhausting the laser gyro in this embodiment includes a ceramic tube 1, a bellows 2 and a sealing structure. One end of the ceramic tube 1 is connected to one end of the bellows 2, and the other end of the ceramic tube 1 is used for sealing connection with the vacuum exhaust table 100. The sealing structure is provided at the other end of the bellows 2. The sealing structure includes a first flange joint 3 provided at the other end of the bellows 2, a second flange joint 4 provided at the end of the air extraction anode 201 of the laser gyro 200, a clamp 5 for clamping the first flange joint 3 and the second flange joint 4, and a metal sealing ring 6 provided between the first flange joint 3 and the second flange joint 4. Knife-edge structures 61 are provided at both ends of the metal sealing ring 6 in the axial direction. While the clamp 5 clamps the first flange joint 3 and the second flange joint 4, the knife-edge structures 61 at both ends of the metal sealing ring 6 in the axial direction are clamped into the end faces of the corresponding flange joints, so that the first flange joint 3 and the second flange joint 4 are hermetically connected through the metal sealing ring 6.
[0029] The joint structure for the charging and exhausting of a ring laser gyro according to the present utility model adopts a joint method of a ceramic tube 1 + a corrugated tube 2. The corrugated tube 2 is hermetically connected to the cavity of the ring laser gyro through an improved KF flange. The ceramic tube 1 plays a role of insulating connection. Moreover, the ceramic tube 1 has higher strength than a conventional glass tube, solving the problem of easy breakage of the glass tube in conventional glass tube fusion sealing; the corrugated tube 2 has excellent elasticity, reducing the problem of rigid connection in conventional high-vacuum detachable sealing; the improved KF flange includes a first flange joint 3 connected to the corrugated tube 2, a second flange joint 4 provided at the end of the extraction anode 201 of the ring laser gyro, a clamp 5 for clamping the two, and a metal sealing ring 6 located between the two. Both ends of the metal sealing ring 6 in the axial direction have a knife-edge structure 61. While the clamp 5 clamps the first flange joint 3 and the second flange joint 4, the knife-edge structures 61 at both ends of the metal sealing ring 6 in the axial direction are clamped into the end faces of the corresponding flange joints, so that the first flange joint 3 and the second flange joint 4 are hermetically connected through the metal sealing ring 6. It can be seen that the above-mentioned improved KF flange sealing structure and the sealing connection process mainly rely on axial force, thus avoiding the risk of indium seal damage of the extraction anode 201 caused by large shear force during the conventional ferrule VCR sealing connection, and also avoiding the problem that the fluororubber releases impurity gases and pollutes the cavity of the ring laser gyro in the conventional KF flange sealed by fluororubber. In addition, since the knife-edge is processed on the sealing ring and the joint is clamped by a clamp, the problems of difficult processing and difficult disassembly of the conventional knife-edge flange are also avoided.
[0030] In this embodiment, as Figure 5 shown, both ends of the metal sealing ring 6 in the axial direction extend towards the end faces of the corresponding flange joints respectively until a knife-edge structure 61 with a sharp-corner cross-section is formed. While the clamp 5 clamps the first flange joint 3 and the second flange joint 4, the entire sharp-cornered knife-edge structure 61 is clamped into the end faces of the corresponding flange joints to hermetically connect the two flange joints.
[0031] In this embodiment, one end of the ceramic tube 1 and one end of the corrugated tube 2 are connected by a third kovar alloy tube 7. The kovar alloy has a small coefficient of thermal expansion and can achieve good non-matching sealing with the ceramic and stainless-steel corrugated tubes.
[0032] In this embodiment, the ceramic tube 1 is made of alumina ceramic, has good insulation and strength, and can be hermetically connected to the kovar alloy joint through brazing.
[0033] In this embodiment, the corrugated tube 2 is a butterfly corrugated tube made of stainless steel, which can withstand high vacuum and high temperature. The disc-shaped corrugated tube structure has excellent elasticity and can avoid the problem of rigid connection.
[0034] In this embodiment, as Figure 6As shown, the clamp 5 is a chain clamp. The sealing structure combining a chain clamp and a metal knife-edge seal ring can achieve quick disassembly and assembly, and the chain clamp also has the function of resisting heating.
[0035] In this embodiment, the material of the metal seal ring 6 is oxygen-free copper or aluminum, which realizes knife-edge sealing and can withstand a high temperature of 300 °C.
[0036] In this embodiment, the other end of the ceramic tube 1 is hermetically connected to the vacuum exhaust table 100 through the second CF flange 8.
[0037] In this embodiment, a fourth kovar alloy tube 9 is also connected between the second CF flange 8 and the ceramic tube 1.
[0038] The joint structure for charging and exhausting of the laser gyroscope of the present utility model has the advantages of vibration resistance, insulation, easy installation and disassembly, and convenient operation on the workbench surface. After the charging and exhausting are completed, the joint structure and the laser gyroscope can be disassembled by squeezing and then cutting off the oxygen-free copper exhaust tube.
[0039] The above-described embodiments are only relatively preferred specific embodiments of the present utility model. The phrases "in one embodiment", "in another embodiment", "in yet another embodiment" or "in other embodiments" used in this specification can all refer to one or more of the same or different embodiments according to the present disclosure. Ordinary variations and substitutions made by those skilled in the art within the scope of the technical solution of the present utility model should be included in the protection scope of the present utility model.
Claims
1. A joint structure for charging and exhausting air of a laser gyroscope, characterized in that, It includes a ceramic tube (1), a corrugated tube (2) and a sealing structure. One end of the ceramic tube (1) is connected to one end of the corrugated tube (2). The other end of the ceramic tube (1) is used for sealing connection with a vacuum exhaust table (100). The sealing structure is arranged at the other end of the corrugated tube (2). The sealing structure includes a first flange joint (3) arranged at the other end of the corrugated tube (2), a second flange joint (4) arranged at the end of the air extraction anode (201) of a laser gyroscope (200), a clamp (5) for clamping the first flange joint (3) and the second flange joint (4), and a metal sealing ring (6) arranged between the first flange joint (3) and the second flange joint (4). Knife-edge structures (61) are arranged at both ends of the metal sealing ring (6) in the axial direction. When the clamp (5) clamps the first flange joint (3) and the second flange joint (4), the knife-edge structures (61) at both ends of the metal sealing ring (6) in the axial direction are clamped into the end faces of the corresponding flange joints, so that the first flange joint (3) and the second flange joint (4) are sealed and connected through the metal sealing ring (6).
2. The joint structure for charging and exhausting of a ring laser gyroscope according to claim 1, wherein, Both ends of the metal sealing ring (6) in the axial direction extend towards the end faces of the corresponding flange joints respectively until knife-edge structures (61) with a sharp-angled cross-section are formed.
3. The joint structure for charging and exhausting of the laser gyroscope according to claim 1 or 2, characterized in that, One end of the ceramic tube (1) and one end of the corrugated tube (2) are connected through a third kovar alloy tube (7).
4. The joint structure for charging and exhausting of a ring laser gyro according to claim 1 or 2, characterized in that, The clamp (5) is a chain clamp.
5. The joint structure for charging and exhausting of the laser gyroscope according to claim 1 or 2, characterized in that, The corrugated tube (2) is a butterfly corrugated tube.
6. The joint structure for charging and exhausting of the laser gyroscope according to claim 1 or 2, characterized in that The material of the corrugated tube (2) is stainless steel.
7. The joint structure for charging and exhausting of a laser gyroscope according to claim 1 or 2, characterized in that, The material of the metal sealing ring (6) is oxygen-free copper or aluminum.
8. The joint structure for charging and exhausting a laser gyroscope according to claim 1 or 2, characterized in that The other end of the ceramic tube (1) is sealed and connected to the vacuum exhaust table (100) through a second CF flange (8).
9. The joint structure for charging and exhausting of a ring laser gyro according to claim 8, characterized in that, A fourth kovar alloy tube (9) is also connected between the second CF flange (8) and the ceramic tube (1).