Solar straight-through heat collecting tube
By setting metal expansion joints and valveable parts on the direct heat collector pipe, the problem of blown pipe during melting is solved, and higher stability and service life are achieved.
Patent Information
- Application Number
- CN202422458781.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-10-11
AI Technical Summary
When the direct heat collector pipe is fused and sealed with metal telescopic corrugated workpieces, rapid thermal expansion and contraction lead to a pipe blowing phenomenon, affecting service life and safety.
The metal expansion joint is tightly connected to the direct heat collector pipe. The metal expansion joint is equipped with a valveable part, and the valveable part has a linear expansion coefficient similar to the silicon boron hard glass and a high Curie point. It is connected through welding to reduce the pipe blasting phenomenon during melting and sealing.
It effectively reduces the phenomenon of pipe blowing when the direct heat collector pipe and metal telescopic corrugated workpieces are melted, and improves the stability and service life of the product.
Smart Images
Figure CN223216506U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of straight-through heat collecting tubes, in particular to a solar straight-through heat collecting tube. Background Art
[0002] A solar water heater converts solar radiation into heat. In my country, solar water heaters are categorized into all-glass evacuated tube solar water heaters, flat-plate water heaters, and sun-heating water heaters. All-glass evacuated tube solar water heaters are currently the most commonly used type of water heater. Straight-through collector tubes are a key component of solar water heaters and a new energy-saving and environmentally friendly product for solar heating, industrial, agricultural, and residential applications. As a new type of evacuated tube, straight-through collector tubes offer the unique advantages of a simple structure, excellent thermal insulation, and a low price. Solar collectors are crucial components in solar thermal applications, absorbing sunlight and transferring it to an internal heat transfer medium.
[0003] Glass vacuum straight-through collector tubes typically consist of a vacuum-sealed glass outer tube and inner tube. These tubes are concentrically arranged, sealed at both ends by fusion, vacuum-baked, and then separated. A support member is placed between the two tubes. The inner tube is coated with a solar-selective coating, and the space within the inner tube serves as a heat transfer medium storage area. The glass outer tube of the straight-through collector tube must surround a metal bellows. Currently, this requires fusion sealing of the straight-through collector tube and the metal bellows. However, there are still limitations. Rapid thermal expansion and contraction during fusion sealing can lead to tube explosion. Utility Model Content
[0004] In order to overcome the defect of the prior art that the fusion seal is prone to tube explosion, the utility model provides a solar direct heat collecting tube.
[0005] The technical solution adopted by the utility model to solve its technical problems is: a solar straight-through heat collecting pipe, comprising a straight-through heat collecting pipe and a metal expansion joint, the metal expansion joint is tightly sleeved on the straight-through heat collecting pipe, and the metal expansion joint is provided with a valve member that can be melt-sealed with the straight-through heat collecting pipe.
[0006] As a further improvement of the present invention, the metal expansion joint is made of stainless steel.
[0007] As a further improvement of the present invention, the straight-through heat collecting pipe and the valve member are welded into one body.
[0008] As a further improvement of the present invention, the valve members may be symmetrically arranged at both ends of the metal expansion joint.
[0009] As a further improvement of the present invention, an exhaust nozzle communicating with the glass inner tube and the glass outer tube is provided on the straight heat collecting tube.
[0010] As a further improvement of the present invention, an evaporative getter coating is provided on the glass outer tube.
[0011] Compared with the prior art, the utility model has the following beneficial effects: in this solution, the metal expansion joint is tightly sleeved on the straight-through heat collecting pipe, and the metal expansion joint is provided with a valve component that can be melt-sealed with the straight-through heat collecting pipe. The valve component has a linear expansion coefficient similar to that of borosilicate hard glass, a high Curie point, and good low-temperature structural stability. The valve component can reduce the pipe bursting phenomenon caused by direct melting and sealing of the straight-through heat collecting pipe and the metal expansion corrugated workpiece. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0013] Figure 1 This is a structural schematic diagram of a solar direct heat collecting tube according to the present utility model.
[0014] In the figure: 1. Straight-through heat collecting tube; 2. Metal expansion joint; 3. Valveable component; 4. Exhaust nozzle; 5. Glass inner tube; 6. Glass outer tube; 7. Evaporable getter coating. DETAILED DESCRIPTION
[0015] In order to make the technical solution and beneficial effects of the present invention more clearly understood, the present invention will be further described in detail below with reference to specific embodiments.
[0016] Reference Figure 1 The embodiment of the utility model discloses a solar straight-through heat collecting pipe, comprising a straight-through heat collecting pipe 1 and a metal expansion joint 2. The metal expansion joint 2 is tightly sleeved on the straight-through heat collecting pipe 1. The metal expansion joint 2 is provided with a valve member 3 that can be melt-sealed with the straight-through heat collecting pipe 1.
[0017] Kovar, also known as 4J29 alloy, has a linear expansion coefficient similar to that of borosilicate glass at 20-450°C, a high Curie point, and good low-temperature structural stability.
[0018] The metal expansion joint 2 is made of stainless steel. The straight-through heat-collecting pipe 1 and the valve-operated component 3 are sealed together by fusion. The hot and cold curves are consistent across an ambient operating temperature range of -30°C to 300°C, ensuring the stability of the glass at specific operating temperatures and achieving an ideal service life. The valve-operated component 3 reduces the risk of pipe explosions caused by direct fusion sealing between the straight-through heat-collecting pipe 1 and the metal expansion bellows.
[0019] The valve component 3 can be symmetrically arranged at both ends of the metal expansion joint 2, and the valve component 3 and the metal expansion joint 2 can be connected together by welding, which can not only ensure that the coefficient values of the two parts are equal during processing, but also ensure that in the product application scenario, when the temperatures of the glass inner tube 5 and the glass outer tube 6 are inconsistent, resulting in the expansion value of the glass inner tube 5 being greater than the expansion value of the glass outer tube 6, the metal expansion joint 2 plays an expansion role.
[0020] An evaporative getter coating 7 is applied to the outer glass tube 6. This absorbs energy, maintaining the temperatures of the inner and outer glass tubes 5 and 6 within a certain range. A vent nozzle 4 is provided on the straight-through heat collecting tube 1, connecting the inner and outer glass tubes 5 and 6. This allows for direct flow between the two tubes, achieving pressure-bearing operation and reducing the risk of tube explosion.
[0021] It should be understood that the specific embodiments described herein are only used to understand the present invention and are not used to limit the present invention. All other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present invention.
Claims
1. A solar direct heat collecting tube, characterized by: It comprises a straight heat collecting pipe (1) and a metal expansion joint (2), wherein the metal expansion joint (2) is tightly sleeved on the straight heat collecting pipe (1), and the metal expansion joint (2) is provided with a valve member (3) capable of being fused and sealed with the straight heat collecting pipe (1).
2. The solar direct heat collecting tube according to claim 1, characterized in that: The metal expansion joint (2) is made of stainless steel.
3. The solar direct heat collecting tube according to claim 2, characterized in that: The straight heat collecting pipe (1) and the valve member (3) are welded into one body.
4. The solar direct heat collecting tube according to claim 3, characterized in that: The valve components (3) are symmetrically arranged at both ends of the metal expansion joint (2).
5. The solar direct heat collecting tube according to claim 4, characterized in that: The straight heat collecting tube (1) is provided with an exhaust nozzle (4) communicating with the glass inner tube (5) and the glass outer tube (6).
6. The solar direct heat collecting tube according to claim 5, characterized in that: An evaporative getter coating (7) is provided on the glass outer tube (6).