Solar metal glass vacuum tube hot-pressing sealing cover tube
By decomposing the outer cover of the solar metal glass vacuum tube into a combination of short section thick-walled glass short pipes and long section thin-walled glass long pipes, the problem of difficulty and high cost in the production of glass flanges in the prior art is solved, and the effect of simplifying the process, reducing costs and improving compressive resistance is achieved.
Patent Information
- Application Number
- CN202421531001.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-07-01
AI Technical Summary
The glass flanges of existing solar metal glass vacuum tubes are difficult to make, costly, and have insufficient compressive resistance, which affects the sealing effect.
The design is decomposed into a combination of short-section thick-walled glass short tubes and long-section thin-walled glass long tubes. They are connected by heating and welding. The short-section thick-walled glass short tubes are easy to make flanges and can directly withstand the hot-pressure sealing pressure.
The production process is simplified, the cost and difficulty are reduced, the flange is compressed and the sealing effect is ensured.
Smart Images
Figure CN222964156U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of solar thermal utilization, in particular to a hot-pressed sealing cover tube for a solar metal-glass vacuum tube. Background Art
[0002] The structure of the existing solar metal-glass vacuum tube is that the outer cover tube is a glass tube, one end of which is closed, the inner heat absorber is metal, and the open end of the glass tube and the metal heat absorber are sealed with a kovar cover. A flange needs to be arranged at the open end of the glass tube for hot-pressed sealing connection with the kovar cover.
[0003] The existing technology is to make a glass flange on a glass tube with the same diameter and wall thickness as the outer cover tube. Since the sealing end face of the flange is relatively wide and requires a certain compressive capacity, the diameter of the glass flange is large and the wall is thick, while the wall thickness of the glass cover tube is only within 3 mm. During production, there is a lot of material accumulation, the forming is difficult, and the cost is high. Therefore, the present application proposes a hot-pressed sealing cover tube for a solar metal-glass vacuum tube, which simplifies the production process and reduces the production difficulty and production cost. Summary of the Utility Model
[0004] In view of the above defects or deficiencies in the prior art, it is desired to provide a hot-pressed sealing cover tube for a solar metal-glass vacuum tube.
[0005] A hot-pressed sealing cover tube for a solar metal-glass vacuum tube provided by the utility model comprises a glass short tube and a glass long tube, and the glass short tube and the glass long tube are connected by a heating and welding method; one end of the glass short tube far away from the glass long tube is provided with a kovar cover through a flange connection.
[0006] Preferably, the interior of the glass short tube is arranged in a through manner up and down, the length of the glass short tube is 50 - 100 mm, and the wall thickness is 3.5 - 5 mm; one end of the glass short tube far away from the glass long tube forms a flange integrated with it through a heating and softening and flattening method, and the end face width of the flange is 8 - 9 mm.
[0007] Preferably, one end of the glass long tube is set as an open end, and the other end is set as a closed end; the wall thickness of the glass long tube is not more than 3 mm; the open end of the glass long tube and one end of the glass short tube far away from the flange are connected by a heating and welding method.
[0008] Preferably, the kovar cover is press-sealed and connected with the flange through a conventional hot-pressed sealing process.
[0009] Compared with the prior art, the beneficial effects of the utility model are:
[0010] The hot-pressed sealing cover tube of the solar metal glass vacuum tube of the present utility model is decomposed into a combination of a short thick-walled glass short tube and a long thin-walled glass long tube. The short thick-walled glass short tube is easy to manufacture the flange required for hot pressing sealing and can directly bear the hot pressing sealing pressure. After hot pressing sealing, the two are butted to form a full-size solar metal glass hot-pressed sealing cover tube, which simplifies the process, reduces the cost and difficulty.
[0011] It should be understood that the content described in the part of the utility model content is not intended to limit the key or important features of the embodiments of the present utility model, nor to limit the scope of the present utility model.
[0012] Other features of the present utility model will become easily understood through the following description. Description of the Drawings
[0013] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects and advantages of the present utility model will become more obvious:
[0014] Figure 1 It is a schematic structural diagram of a sealing cover tube in the prior art;
[0015] Figure 2 It is a schematic structural diagram of a hot-pressed sealing cover tube of a solar metal glass vacuum tube provided by an embodiment of the present utility model;
[0016] Figure 3 It is a structural diagram of a short thick-walled glass short tube;
[0017] Figure 4 It is a top view of the short thick-walled glass short tube;
[0018] Reference numerals in the figure: 11, glass cover tube; 12, metal heat absorber; 13, kovar cover one; 111, glass flange one;
[0019] 21, glass short tube; 22, glass long tube; 23, flange; 24, kovar cover; 25, open end; 26, closed end. Detailed Description of the Embodiments
[0020] The following further describes the present utility model in detail with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related utility model and do not limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for the convenience of description.
[0021] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. The following will describe the present utility model in detail with reference to the drawings and embodiments.
[0022] Please refer toFigure 1 , the existing solar metal glass vacuum tube is composed of a metal heat absorber 12 and a glass cover tube 11. A glass flange 111 needs to be provided at the open end of the glass cover tube 11 at the glass tube end for hot pressing and sealing connection with a kovar cover 13; the existing manufacturing technology of the glass flange 1 is to manufacture the glass flange 111 on a glass tube with the same diameter and wall thickness as the outer cover tube 11. Since the sealing end face of the glass flange 111 is relatively wide and a certain compressive capacity is required, the diameter of the glass flange 111 is large and the wall is thick, while the wall thickness of the glass cover tube 11 is only within 3 mm. During manufacturing, there is a lot of material accumulation, the forming is difficult, and the cost is high.
[0023] Please refer to Figures 2 to 4 , an embodiment of the present invention provides a hot-pressed sealing cover tube for a solar metal glass vacuum tube, which includes a glass short tube 21 and a glass long tube 22. The glass short tube 21 and the glass long tube 22 are connected by a heating and welding method; one end of the glass short tube 21 away from the glass long tube 22 is connected with a kovar cover 24 through a flange 23.
[0024] In a preferred embodiment, the inside of the glass short tube 21 is provided in a through-up-and-down manner. The length of the glass short tube 21 is 50 - 100 mm, and the wall thickness is 3.5 - 5 mm; one end of the glass short tube 21 away from the glass long tube 22 forms a flange 23 integrated with it through a heating and softening and flattening method. The end face width of the flange 23 is 8 - 9 mm; the compressive capacity of the short-section thick-wall glass short tube 21 is much greater than the pressure required for hot pressing and sealing, and the glass tube can be avoided from being crushed.
[0025] In a preferred embodiment, one end of the glass long tube 22 is set as an open end 25, and the other end is set as a closed end 26; the wall thickness of the glass long tube 22 is not greater than 3 mm; the open end 25 of the glass long tube 22 and one end of the glass short tube 21 away from the flange 23 are connected by a heating and welding method.
[0026] Wherein, the outer diameter of the glass short tube 21 is the same as or slightly smaller than the outer diameter of the glass long tube 22.
[0027] In a preferred embodiment, the kovar cover 24 is press-sealed and connected with the flange 23 through a conventional hot-pressing and sealing process.
[0028] In this application, the envelope tube is formed by butt - joining two glass tubes with different wall thicknesses and different lengths. The short glass tube 21 is a thick - wall glass tube with a length of 50 - 100 mm and a wall thickness of 3.5 - 5 mm. One end of it is heated and softened, and then flattened with a graphite plate to a sealing plane with an end - face width of 8 - 9 mm, thus forming the glass flange 23 without the need for material stacking. Then, the other end of this short - section thick - wall glass tube 21 is directly supported on a platform, and a kovar cap 24 is placed on it. The hot - press sealing connection between the flange 23 end of the glass tube 21 and the kovar cap 24 is completed using a conventional hot - press sealing process. Since the compressive capacity of the short - section thick - wall glass tube 21 is much greater than the pressure required for hot - press sealing, the glass tube can be prevented from being crushed.
[0029] The above - mentioned hot - press - sealed glass - kovar connector (i.e., the connector integrating the glass short tube 21 and the flange 23) and the thin - wall glass long tube 22 are heated and welded on a glass lathe to form a full - size hot - press - sealed envelope tube for a solar metal - glass vacuum tube.
[0030] Example 1
[0031] Take a thick - wall glass short tube 21 with an outer diameter the same as that of the glass long tube 22, a length of 100 mm, and a wall thickness of 4.5 mm. Clamp it on a glass lathe, heat and soften one end of it with a flame, and flatten it with a graphite plate to a sealing plane with an end - face width of 8 - 9 mm, thus forming the glass flange 23 without the need for material stacking. Then, the other end of this short - section thick - wall glass tube 21 is directly supported on a platform, and a kovar cap 24 is placed on it. The hot - press sealing connection between the flange end of the glass tube 21 and the kovar cap 24 is completed using a conventional hot - press sealing process. Since the compressive capacity of the short - section thick - wall glass tube 21 is much greater than the pressure required for hot - press sealing, the glass tube can be prevented from being crushed.
[0032] The above - mentioned hot - press - sealed glass - kovar connector and a 2 - meter - long thin - wall outer glass long tube 22 are heated and welded on a glass lathe, that is, the end of the glass short tube 21 far from its flange 23 and the open end of the glass long tube 22 are heated and welded to form a full - size hot - press - sealed envelope tube for a solar metal - glass vacuum tube.
[0033] The present invention decomposes the hot - press - sealed outer envelope tube of a solar metal - glass vacuum tube into a combination of a short - section thick - wall glass short tube 21 and a long - section thin - wall glass long tube 22. The short - section thick - wall glass short tube 21 is easy to make the flange 23 required for hot - press sealing and can directly withstand the hot - press sealing pressure. After hot - press sealing, the two glass tubes are butt - joined to form a full - size hot - press - sealed envelope tube for a solar metal - glass vacuum tube, simplifying the process and reducing the cost.
[0034] In the description of this specification, terms such as "connection", "installation", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0035] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.
[0036] The above are only the preferred embodiments of this application and are not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.
Claims
1. A solar metal glass vacuum tube hot-pressed sealing tube, characterized in that: The invention comprises a short glass tube and a long glass tube, wherein the short glass tube is connected to the long glass tube by heating and welding; the end of the short glass tube away from the long glass tube is provided with a cap by flange connection; the interior of the short glass tube is provided with a vertical through-type arrangement, the length of the short glass tube is 50-100 mm, and the wall thickness is 3.5-5 mm; the end of the short glass tube away from the long glass tube is formed into a flange integral with the long glass tube by heating, softening and flattening, and the end face width of the flange is 8-9 mm; one end of the long glass tube is provided as an open end, and the other end is provided as a closed end; the wall thickness of the long glass tube is not greater than 3 mm; the open end of the long glass tube is connected to the end of the short glass tube away from the flange by heating and welding.
2. The solar metal glass vacuum tube hot-pressing sealing tube according to claim 1 is characterized in that: The kovar cover is press-sealed and connected to the flange by a conventional hot press-sealing process.