A heat collecting tube with elastic buffering structure

Abstract

The utility model belongs to the technical field of heat collecting tube, especially, relate to a heat collecting tube with elastic buffer structure, including heat collecting tube main part, the heat collecting tube main part includes inner cover, end cover, corrugation, connecting ring, steel pipe, glass tube, getter box, getter seat, exhaust nozzle and Kovar ring. Through being provided with connecting ring and kovar ring in the transition area of glass tube and steel pipe, the elastic buffer structure is formed, when glass tube is heated and can take place linear expansion, through the elastic deformation of connecting ring and kovar ring absorbs the expansion energy of glass tube, and the elastic buffer structure structure is located in the transition area of glass tube and steel pipe, can disperse the concentrated stress, avoid stress direct action on the fusion sealing interface of glass tube, thereby make the elastic buffer structure effectively solved the tension problem caused by glass tube thermal expansion, significantly reduced the risk of glass tube crack and rupture, prolonged the service life of heat collecting tube.

Description

Technical Field

[0001] This utility model relates to the field of heat collection tube technology, and in particular to a heat collection tube with an elastic buffer structure. Background Technology

[0002] In actual operation scenarios, the glass tube, as the core component for heat conduction and insulation, must withstand a dynamic temperature range of 20℃-400℃ for extended periods. This temperature range covers the entire operating condition of the collector tube, from standby to full-load operation. Due to the physical properties of thermal expansion and contraction, the glass tube undergoes significant volume expansion. This expansion is not uniform and controllable, creating continuous and unstable tension at the connection points between the glass tube and other components. If this tension is not effectively relieved, it can lead to minor cracks on the surface of the glass tube, affecting heat conduction efficiency; in severe cases, it can cause the glass tube to rupture or directly cause the connection structure between the glass tube and surrounding components to fail. This not only requires frequent component replacements, increasing maintenance costs, but also directly interrupts the normal operation of the collector tube, significantly shortening its overall service life. This has become a key issue restricting the stable application of collector tubes. To address this problem, we propose a collector tube with an elastic buffer structure. Utility Model Content

[0003] The purpose of this invention is to provide a heat collection tube with an elastic buffer structure to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a heat collection tube with an elastic buffer structure, comprising a heat collection tube body, the heat collection tube body including an inner sleeve, an end cap, corrugations, a connecting ring, a steel pipe, a glass tube, a getter box, a getter seat, an exhaust nozzle, and a Kovar ring, the end cap being assembled at the end of the inner sleeve, the corrugations being linked with the inner sleeve, the steel pipe penetrating the heat collection tube body, the Kovar ring being fused to the glass tube, the connecting ring being connected to the Kovar ring, the getter seat being provided with a getter box, and the exhaust nozzle being provided on the side of the heat collection tube body and communicating with the internal cavity.

[0005] As an improved technical solution, the connection between the connecting ring and the Kovar ring forms an elastic buffer structure, which is located in the transition area between the glass tube and the steel tube.

[0006] As an improved technical solution, the getter box is fixed to the inner wall of the glass tube by a getter seat, and the getter box and the exhaust nozzle are in the same axial extension direction.

[0007] As an improved technical solution, the expansion coefficient of the Kovar ring is basically close to that of the glass tube.

[0008] As an improved technical solution, the connecting ring is made of stainless steel.

[0009] As an improved technical solution, the getter box has a ring-shaped structure, which is sleeved around the steel pipe and does not contact the steel pipe, and is fixed to the inner wall of the glass tube by at least two symmetrically distributed getter seats.

[0010] After adopting the above technical solution, the beneficial effects of this utility model are: I. This utility model forms a sealed support structure through the inner sleeve and end caps, thereby achieving overall sealing and structural stability of the heat collection tube. Furthermore, the combination of corrugations and connecting rings initially alleviates thermal stress, improving the temperature resistance and durability of the heat collection tube. Simultaneously, the arrangement of the getter box and exhaust nozzle ensures the long-term maintenance of the internal vacuum environment, reducing heat loss and improving heat collection efficiency. The overall design simplifies the assembly process and reduces production costs.

[0011] II. This utility model forms an elastic buffer structure by setting a connecting ring and a Kovar ring in the transition area between the glass tube and the steel tube. When the glass tube is heated, it will expand linearly. The expansion energy of the glass tube is absorbed by the elastic deformation of the connecting ring and the Kovar ring themselves. The elastic buffer structure is located in the transition area between the glass tube and the steel tube, which can disperse the concentrated stress and avoid the stress acting directly on the fusion interface of the glass tube. Thus, the elastic buffer structure effectively solves the tensile problem caused by the thermal expansion of the glass tube, significantly reduces the risk of glass tube cracking and breakage, extends the service life of the heat collection tube, and reduces the frequency and cost of maintenance. At the same time, this structure improves the adaptability of the heat collection tube under dynamic temperature changes and ensures the stability of long-term operation, especially suitable for harsh environments such as solar thermal collection. Attached Figure Description

[0012] Figure 1 This is a front view structural diagram of the present utility model; Figure 2 For the present utility model Figure 1 A magnified structural diagram at point A.

[0013] In the diagram: 1. Inner sleeve; 2. End cap; 3. Corrugated; 4. Connecting ring; 5. Steel pipe; 6. Glass tube; 7. Getter box; 8. Getter holder; 9. Exhaust nozzle; 10. Kovar ring. Detailed Implementation

[0014] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0015] This utility model provides a technical solution as follows: Figures 1 to 2As shown in this embodiment, a heat collection tube with an elastic buffer structure includes a heat collection tube body. The heat collection tube body includes an inner sleeve 1, an end cap 2, a corrugated core 3, a connecting ring 4, a steel pipe 5, a glass tube 6, a getter box 7, a getter seat 8, an exhaust nozzle 9, and a Kovar ring 10. The end cap 2 is assembled at the end of the inner sleeve 1. The corrugated core 3 is linked with the inner sleeve 1. The steel pipe 5 passes through the heat collection tube body. The Kovar ring 10 is fused to the glass tube 6. The connecting ring 4 is connected to the Kovar ring 10. The getter seat 8 is provided with the getter box 7. The exhaust nozzle 9 is provided on the side of the heat collection tube body and communicates with the internal cavity.

[0016] The main body of the heat collector tube forms a sealed support structure through the inner sleeve 1 and the end cap 2. The corrugated 3, as a flexible element, is linked with the inner sleeve 1, allowing the heat collector tube to undergo slight displacement in the axial and radial directions to adapt to dimensional changes caused by temperature variations. The cooperation between the corrugated 3 and the connecting ring 4 initially alleviates thermal stress and improves the temperature resistance and durability of the heat collector tube. The steel pipe 5, as the core of heat conduction, runs through the main body of the heat collector tube to transfer heat energy. The glass tube 6 provides heat insulation and transparent protection. The Kovar ring 10 is fused to the glass tube 6 to ensure airtightness. The connecting ring 4 is then connected to the Kovar ring 10 to form a transition area, which plays a role in stress transfer. The getter box 7 is fixed by the getter seat 8 and is used to absorb residual gas inside the heat collector tube to maintain the vacuum. The exhaust nozzle 9 is connected to the internal cavity and is used to discharge gas during the vacuuming process. The arrangement of the getter box 7 and the exhaust nozzle 9 ensures the long-term maintenance of the internal vacuum environment, reduces heat loss, and improves heat collection efficiency.

[0017] In other embodiments, the connection between the connecting ring 4 and the Kovar ring 10 forms an elastic buffer structure, which is located in the transition area between the glass tube 6 and the steel tube 5. When the collector tube operates within the temperature range of 20℃-400℃, the glass tube 6 undergoes linear expansion upon heating, generating axial tensile force. This expansion energy is absorbed by the elastic deformation of the connecting ring 4 and Kovar ring 10. The elastic buffer structure, located in the transition area between the glass tube 6 and the steel pipe 5, disperses the concentrated stress, preventing stress from directly acting on the fusion interface of the glass tube 6. Thus, the elastic buffer structure effectively solves the tensile force problem caused by the thermal expansion of the glass tube 6, significantly reducing the risk of cracks and breakage of the glass tube 6, extending the service life of the collector tube, and reducing maintenance frequency and costs. At the same time, this structure improves the adaptability of the collector tube under dynamic temperature changes, ensuring long-term operational stability, and is particularly suitable for harsh environments such as solar thermal collection.

[0018] In other embodiments, the getter box 7 is fixed to the inner wall of the glass tube 6 by the getter seat 8, and the getter box 7 and the exhaust nozzle 9 are in the same axial extension direction. This design allows the getter box 7 to contain getter material, which is then firmly fixed to the inner wall of the glass tube 6 via the getter seat 8. This ensures that the getter box 7 will not shift due to vibration or temperature changes during the operation of the heat collection tube. Furthermore, the getter box 7 and the exhaust nozzle 9 are arranged coaxially, which straightens the gas flow path during the vacuuming process, facilitating the efficient discharge of gas through the exhaust nozzle 9.

[0019] In other embodiments, the coefficient of thermal expansion of Kovar ring 10 is substantially close to that of glass tube 6; This design allows the Kovar ring 10 to be made of a material with a coefficient of thermal expansion that matches that of the glass tube 6, such as an iron-nickel-cobalt alloy. Within a temperature range of 20℃ to 400℃, the thermal expansion curves of the two are highly consistent. When the temperature changes, the Kovar ring 10 and the glass tube 6 expand or contract at similar rates, avoiding the generation of large thermal stress at the fusion sealing interface. This ensures the sealing integrity of the fusion sealing part and prevents microcracks or leaks caused by thermal mismatch.

[0020] In other embodiments, the connecting ring 4 is made of stainless steel 304; This design ensures the long-term durability and reliability of the connecting ring 4 by using 304 stainless steel, reduces the decrease in buffering function due to material aging, lowers maintenance requirements, and improves the adaptability of the connecting ring 4 in harsh environments. In addition, 304 stainless steel is low in cost, easy to process, and conducive to large-scale production.

[0021] In other embodiments, the getter box 7 is an annular structure, which is sleeved around the steel pipe 5 and does not contact the steel pipe 5, and is fixed to the inner wall of the glass tube 6 by at least two symmetrically distributed getter seats 8. By designing the getter box 7 as a ring structure surrounding the steel pipe 5 and using symmetrical support and fixation, the getter box 7 is more evenly distributed in the space inside the pipe. This structure increases the effective surface area and exposure space of the getter, so that the gas can be efficiently absorbed no matter which direction it is released from. The non-contact design with the steel pipe 5 avoids the thermal bridge effect and reduces the impact on the temperature field of the steel pipe 5, which greatly improves the uniformity of getter distribution and absorption efficiency, and can establish and maintain a high vacuum more quickly and for a long time.

[0022] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A heat collection tube with an elastic buffer structure, comprising a heat collection tube body, characterized in that: The main body of the heat collection tube includes an inner sleeve (1), an end cap (2), a corrugated plate (3), a connecting ring (4), a steel pipe (5), a glass tube (6), a getter box (7), a getter seat (8), an exhaust nozzle (9), and a Kovar ring (10). The end cap (2) is assembled at the end of the inner sleeve (1), the corrugated plate (3) is linked with the inner sleeve (1), the steel pipe (5) penetrates the main body of the heat collection tube, the Kovar ring (10) is fused to the glass tube (6), the connecting ring (4) is connected to the Kovar ring (10), the getter seat (8) is provided with a getter box (7), and the exhaust nozzle (9) is provided on the side of the main body of the heat collection tube and communicates with the internal cavity.

2. A heat collection tube with an elastic buffer structure according to claim 1, characterized in that: The connection between the connecting ring (4) and the Kovar ring (10) forms an elastic buffer structure, which is located in the transition area between the glass tube (6) and the steel tube (5).

3. A heat collection tube with an elastic buffer structure according to claim 1, characterized in that: The getter box (7) is fixed to the inner wall of the glass tube (6) by the getter seat (8), and the getter box (7) and the exhaust nozzle (9) are in the same axial extension direction.

4. A heat collection tube with an elastic buffer structure according to claim 1, characterized in that: The expansion coefficient of the Kovar ring (10) is basically close to that of the glass tube (6).

5. A heat collection tube with an elastic buffer structure according to claim 1, characterized in that: The connecting ring (4) is made of stainless steel 304.

6. A heat collection tube with an elastic buffer structure according to claim 1, characterized in that: The getter box (7) is a ring structure, which is sleeved around the steel pipe (5) and does not contact the steel pipe (5), and is fixed to the inner wall of the glass tube (6) by at least two symmetrically distributed getter seats (8).

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