A double indium ring sealing structure and its application
By adopting a double indium ring sealing structure in low-temperature optical equipment, the leakage problem caused by uneven stress of single indium ring sealing is solved, and a better sealing effect and longer service life are achieved, reducing maintenance costs.
Patent Information
- Application Number
- CN202111375001.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-11-19
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2041-11-19
AI Technical Summary
In low-temperature optical equipment, single indium ring seals cause slight deformation around the optical window due to uneven stress, resulting in leakage, shortening the service life of the optical window.
Using a double indium ring sealing structure, including an inner indium ring and an outer indium ring. When the second flange is fixed by bolts, the inner indium ring and the outer indium ring are uniformly compressed to avoid excessive tightness or lifting, ensure that the sealing surface is flat and improve Sealing effect.
It enhances the sealing effect of low-temperature vacuum equipment, extends the service life of optical windows, reduces maintenance costs, and improves thermal insulation performance.
Smart Images
Figure CN114019641B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of low-temperature vacuum equipment sealing, and in particular to a double indium ring sealing structure and application thereof. Background Art
[0002] In cryogenic optical equipment, there is often a sealing problem of installing a cryogenic optical window on a cryogenic experimental sample chamber in a vacuum environment. Due to the low temperature, ordinary rubber ring sealing is no longer usable, and only indium ring sealing technology can be used. In the prior art, the field of cryogenic optics is more commonly used to use a single indium ring for sealing of the optical window.
[0003] The advantage of using a single indium ring for sealing the optical window is that it is convenient to replace different types of optical windows. You only need to remove the seal of the indium ring to replace it. However, in the actual use process, problems are gradually exposed. Because the tube wall supporting this optical window is very thin, and when installing the optical window, a circle of indium wire ring is sandwiched between the sealing surfaces, which makes the stress of the surrounding mounting bolts uneven. Under low temperature conditions, it will produce slight deformation around the bonding lens. This slight deformation, coupled with the shrinkage at low temperature, will cause leakage around the optical lens.
[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention
[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a double indium ring sealing structure and its application, aiming to solve the problem in the prior art that low-temperature optical windows are sealed with a single indium wire, resulting in uneven stress, resulting in slight deformation around the bonded lens, thereby shortening the service life of the optical window.
[0006] The technical solution of the present invention is as follows:
[0007] A double indium ring sealing structure, comprising a first flange connected to a vacuum device, a second flange fixed to the first flange by bolts, an optical lens bonded to the second flange, and an inner indium ring and an outer indium ring sandwiched between the first flange and the second flange;
[0008] Among them, a mounting hole is provided on the first flange; an optical window is provided on the second flange, the edge of the optical window vertically extends toward the first flange to form a supporting tube, the optical lens is adhered to the supporting tube and away from one end of the second flange; the supporting tube is embedded in parallel with the mounting hole.
[0009] The double indium ring sealing structure, wherein the first flange is provided with a first groove and a second groove on the contact surface where the first flange contacts the second flange; the inner indium ring is placed in the first groove, and the outer indium ring is placed in the second groove.
[0010] The double indium ring sealing structure, wherein a screw hole is provided between the first groove and the second groove, a light hole matching the screw hole is provided on the second flange, and the second flange is fixedly connected to the first flange by bolts passing through the light hole and the screw hole.
[0011] The double indium ring sealing structure, wherein the screw holes include at least three and are evenly distributed along the circumferential direction.
[0012] In the double indium ring sealing structure, the optical window is circular.
[0013] In the double indium ring sealing structure, the cross-sectional diameters of the inner indium ring and the outer indium ring are the same.
[0014] The double indium ring sealing structure has four screw holes, and the second flange is connected to the first flange by four bolts.
[0015] The double indium ring sealing structure, wherein the second flange is an embedded optical window flange.
[0016] An application of a double indium ring sealing structure, wherein the double indium ring sealing structure is used for sealing optical windows of low-temperature vacuum equipment.
[0017] Beneficial effects: The present invention provides a double indium ring sealing structure and its application, the double indium ring sealing structure comprises a first flange mounted on a vacuum device, a second flange fixed to the first flange by bolts, an optical lens bonded to the second flange, and an inner indium ring and an outer indium ring sandwiched between the first flange and the second flange; the present invention adopts a double indium ring sealing structure, which is divided into an inner indium ring and an outer indium ring. When the second flange is fixed by tightening the bolts, the second flange will be embedded in parallel along the mounting hole, avoiding the phenomenon of over-tightening or warping caused by the interaction between the bolts and the indium ring when tightening, so that the optical window sealing effect of the low-temperature vacuum equipment is better, the performance is stable and reliable. Due to the improved sealing effect, its heat insulation effect is also enhanced, the service life of the optical window is extended, and the maintenance cost of the equipment is reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a three-dimensional structural schematic diagram of a double indium ring sealing structure of the present invention;
[0019] Figure 2 This is a schematic diagram of the structural decomposition of a double indium ring sealing structure of the present invention;
[0020] Figure 3 A cross-sectional view of a double indium ring sealing structure of the present invention along line AA;
[0021] Figure 4 It is an enlarged schematic diagram of a double indium ring sealing structure B of the present invention. DETAILED DESCRIPTION
[0022] The present invention provides a double indium ring sealing structure and its application. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0023] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features.
[0024] At present, the field of low-temperature optics is more commonly used in an installation form called embedded optical window. This optical window is to seal the optical lens with a thin-walled support tube by low-temperature bonding. Then the sealing flange at the other end of the thin-walled support tube uses an indium wire ring to seal the optical window on the sample chamber. The advantage of sealing the optical window on the sample chamber in this way is that it is easy to replace different types of optical windows. You only need to disassemble the seal of the indium ring to replace it. However, people have found in actual use that due to the consideration of heat conduction, the support tube wall of this optical window is very thin. In addition, when installing the optical window, due to the indium wire ring sandwiched between the sealing surfaces, it is easy to cause uneven stress on the surrounding mounting bolts. Under low temperature conditions, the support tube wall will cause slight deformation. This slight deformation, coupled with the shrinkage at low temperature, causes some leakage at the bonding point of the optical lens, resulting in vacuum leakage in the sample chamber, affecting the insulation effect and shortening the service life of the optical window, thereby increasing the maintenance cost.
[0025] Based on this, please refer to the attached Figure 1-2The present invention provides a double indium ring sealing structure, including a first flange 20 connected to a vacuum device 10, a second flange 40 fixed to the first flange 20 by bolts 30, an optical lens 50 bonded to the second flange 40, and an inner indium ring 60 and an outer indium ring 70 sandwiched between the first flange 20 and the second flange 40.
[0026] In this embodiment, the device 10 is an experimental sample cold chamber. It should be noted that the device 10 provided in the drawings of the present invention is only for reference explanation and is not intended to limit the scope of the device 10 of the present invention.
[0027] In this embodiment, a mounting hole 201 is provided on the first flange 20; an optical window 401 is provided on the second flange 40, and the edge of the optical window 401 extends vertically toward the first flange 20 to form a support tube 402, and the optical lens 50 is adhered to the support tube 402 and away from the side of the second flange 40; the support tube 402 is embedded in parallel with the mounting hole 201.
[0028] In some embodiments, the support tube can be used to observe the situation inside the device 10 with naked eyes; or, an observation device can be inserted into the support tube to indirectly observe the situation inside the device 10.
[0029] Specifically, as attached Figure 3-4 As shown, the double indium ring sealing structure also includes low-temperature sealant 80. The diameter of the optical lens is equal to the inner diameter of the support tube, so that the optical lens is just stuck on the inner wall of the support tube. Then, the low-temperature sealant 80 is used to seal the edge of the optical lens away from the second flange to ensure the sealing of the equipment.
[0030] In the prior art, when a single indium ring is used, the optical window flange is fixed to the equipment with bolts, and a lever principle will occur. That is, when the bolts are tightened, the single indium ring will act as a fulcrum. Therefore, the other end of the optical window flange will be lifted up, resulting in poor sealing effect and easy vacuum leakage. Alternatively, due to slight defects on the surface of the indium ring, such as protrusions or depressions, the contact surface between the indium ring and the flange is uneven, forming a tiny lever structure. When the flange squeezes the indium ring, the seal will be too tight or lifted up, resulting in poor sealing effect and vacuum leakage.
[0031] In this embodiment, a double indium ring sealing structure is used to install the second flange on the first flange, which can make the sealing surface smooth, the sealing effect is good, and the vacuum degree of the vacuum equipment is improved, thereby achieving a good heat insulation effect. Double indium rings are used for sealing. When the equipment is at a low temperature, the shrinkage rate of the indium ring is uniform, and it will not be over-tightened or warped, achieving a high vacuum state; the enhanced heat insulation effect also greatly extends the service life of the optical window.
[0032] In some embodiments, the first flange 20 has a first groove 202 and a second groove 203 on the contact surface between the first flange 20 and the second flange 40; the inner indium ring 60 is placed in the first groove 202, and the outer indium ring 70 is placed in the second groove 203. Specifically, Figure 4 As shown, after the inner indium ring and the outer indium ring are placed in the groove, the indium ring should be partially exposed outside the groove so as to withstand the pressure of the second flange and be flattened to play the role of sealing the optical window.
[0033] In this embodiment, the indium ring is placed in the groove to facilitate the positioning of the indium ring during installation. When tightened by bolts, the indium ring is pressed and in close contact with the second flange, which can achieve a better sealing effect for the optical window.
[0034] In some embodiments, a screw hole 204 is provided between the first groove 202 and the second groove 203, and a light hole 403 matching the screw hole 204 is provided on the second flange 40. The second flange 40 is fixedly connected to the first flange 20 by passing the bolt 30 through the light hole 403 and the screw hole 204. The screw hole 204 is arranged between the first groove 202 and the second groove 203, which is conducive to the second flange 40 generating a uniform pressure on the inner indium ring 60 and the outer indium ring 70 when the bolt 30 is tightened and fixed, so that the inner indium ring and the outer indium ring are uniformly pressed, avoiding the over-tightening or warping caused by the tightening of the bolts or the interaction between the indium rings, and the double indium ring sealing structure makes the sealing surface flat, ensuring that there will be no obvious deformation at the bonding point of the optical lens at low temperature. In other words, the screw hole is arranged between the first groove 202 and the second groove 203. When the bolt passes through the light hole to fix the second flange on the first flange, when the bolt is tightened, the inner indium ring and the outer indium ring jointly support the second flange, avoiding the lever structure of a single indium ring, so that the contact surface between the second flange and the first flange is flat, which has a good sealing effect.
[0035] In some embodiments, the screw holes 204 include at least three and are evenly distributed along the circumferential direction; for example: when there are three screw holes, the spacing between them is one-third of the circumference of the circle where the screw holes are located; when there are four screw holes, the spacing between them is one-quarter of the circumference of the circle where the screw holes are located; and so on.
[0036] In this embodiment, there are four screw holes 204, and the second flange 40 is connected to the first flange by four bolts. Specifically, the four bolts pass through the light holes 403 to fix the second flange 40 on the first flange 20, and an indium ring placed in the groove is sandwiched between the contact surfaces of the first flange and the second flange. The pressure of the bolts on the second flange is used to press the indium ring flat and make it in close contact with the flange to achieve a sealing effect.
[0037] In this embodiment, when tightening the bolts, a wrench with a bolt torque gauge is preferably used to tighten them to ensure that the second flange is installed properly. Finally, vacuuming and leak detection tests are performed until they meet the use requirements of the low-temperature optical window.
[0038] In some embodiments, the optical window is circular. In this embodiment, since the double indium ring sealing structure is applied to low-temperature vacuum equipment or ultra-vacuum equipment, the pressure difference between the inside and outside is large, the use of a circular optical window can make the flange receive a more uniform force, avoid large local stress, and reduce the cracking of the optical window caused by uneven force due to the pressure difference between the inside and outside.
[0039] In some embodiments, the cross-sectional diameters of the inner indium ring and the outer indium ring are the same. The cross-sectional apertures of the first groove and the second groove are the same, so that after the inner indium ring and the outer indium ring with the same cross-sectional diameter are placed in the groove, the contact surfaces of the inner indium ring and the outer indium ring and the second flange are at the same horizontal height, which is conducive to uniform force on the two indium rings and avoids over-tightening or warping.
[0040] In this embodiment, the second flange is an embedded optical window flange.
[0041] In some embodiments, the double indium ring sealing structure is used for sealing optical windows of low-temperature vacuum equipment.
[0042] In this embodiment, the double indium ring sealing structure is used for sealing the optical window of 1K system vacuum equipment.
[0043] In summary, the present invention provides a double indium ring sealing structure and its application, the double indium ring sealing structure comprises a first flange connected to the vacuum equipment, a second flange fixed to the first flange by bolts, an optical lens bonded to the second flange, and an inner indium ring and an outer indium ring sandwiched between the first flange and the second flange; wherein the space between the inner indium ring and the outer indium ring is provided with a screw hole for matching and fixing with the bolt; the present invention adopts a double indium ring sealing structure, which is divided into an inner indium ring and an outer indium ring, and when the second flange is fixed by tightening the bolts, the second flange will be embedded in parallel along the installation hole, avoiding the phenomenon of over-tightening or warping caused by the interaction between the bolts and the indium ring when tightening, so that the optical window sealing effect of the low-temperature vacuum equipment is better, the performance is stable and reliable. Due to the improved sealing effect, its heat insulation effect is also enhanced, the service life of the optical window is extended, and the maintenance cost of the equipment is reduced.
[0044] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.
Claims
1. A double indium ring sealing structure, characterized in that: It includes a first flange connected to the vacuum equipment, a second flange fixed to the first flange by bolts, an optical lens bonded to the second flange, and an inner indium ring and an outer indium ring sandwiched between the first flange and the second flange; The first flange is provided with a mounting hole; the second flange is provided with an optical window, the edge of the optical window vertically extends toward the first flange to form a support tube, the optical lens is bonded to the support tube and is away from one end of the second flange; the support tube is embedded in parallel with the mounting hole; The first flange has a first groove and a second groove on the contact surface where the first flange contacts the second flange; the inner indium ring is placed in the first groove, and the outer indium ring is placed in the second groove; the second flange is an embedded optical window flange.
2. The double indium ring sealing structure according to claim 1, characterized in that: A screw hole is arranged between the first groove and the second groove, a light hole matching the screw hole is arranged on the second flange, and the second flange is fixedly connected to the first flange by bolts passing through the light hole and the screw hole.
3. The double indium ring sealing structure according to claim 2, characterized in that: The screw holes include at least three and are evenly distributed along the circumferential direction.
4. The double indium ring sealing structure according to claim 3, characterized in that: There are four screw holes, and the second flange is connected to the first flange through four bolts.
5. The double indium ring sealing structure according to claim 1, characterized in that: The optical window is circular.
6. The double indium ring sealing structure according to claim 1, characterized in that: The cross-sectional diameters of the inner indium ring and the outer indium ring are the same.
7. An application of a double indium ring sealing structure, characterized in that: The double indium ring sealing structure described in any one of claims 1 to 6 is used for sealing the optical window of low-temperature vacuum equipment.