CN213514481U

CN213514481U - Straight-through solar vacuum heat collecting tube

Info

Publication number: CN213514481U
Application number: CN202022000253.2U
Authority: CN
Inventors: 韩春红; 胡皓天; 胡皓然; 李金铎; 刘芳; 李永赛; 李永兴
Original assignee: Shijiazhuang Sund Industrial Co ltd
Current assignee: Shijiazhuang Sund Industrial Co ltd
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2021-06-22
Anticipated expiration: 2030-09-14

Abstract

The utility model provides a straight-through solar vacuum heat collecting tube, belongs to solar water heater technical field, and including inlayer glass pipe and outer glass pipe, inlayer glass and outer glass are coaxial glass pipe, and sealed butt fusion is as an organic whole between the both ends of inlayer glass pipe and outer glass pipe simultaneously, be the vacuum layer in the middle of the two-layer glass pipe, be provided with the annular breach in the middle of the outer glass pipe, annular breach department is provided with the ripple expansion joint of metal, and the outer glass pipe of annular breach both sides is provided with the lateral wall of thickening and is used for with ripple expansion joint sealing connection, and the ripple expansion joint is provided with the safety cover outward. The straight-through solar vacuum heat collecting tube solves the problem that the glass tube is broken due to the difference of expansion amount caused by the temperature difference of the inner tube and the outer tube of the all-glass vacuum heat collecting tube.

Description

Straight-through solar vacuum heat collecting tube

Technical Field

The utility model relates to a through solar vacuum heat collecting tube belongs to solar water heater technical field.

Background

The sustainable development of human society and economy, the demand of people on energy is more and more large, the conventional energy reserves are increasingly tightened, the pressure of global warming and environmental pollution causes that people have to seek novel energy to ensure the sustainable development of human society, solar energy is renewable new energy, has the advantages of cleanness, no pollution, persistence and long term, becomes an important choice for people to deal with energy shortage, climate change and pollution reduction, and the development and utilization of solar energy becomes an important measure for the long-term sustainable development of people.

At present, there are two ways of solar energy utilization with relatively mature technology: photo-thermal utilization and photo-electric utilization. Among them, the basic principle of solar heat utilization is that solar heat collection devices such as evacuated solar collector tubes, flat plate collectors, and ceramic solar collectors convert light energy in natural state into heat energy for direct use in daily life. The glass tube with the heat transfer capability makes most of the essential components of the heat collecting device directly related to the conversion efficiency of solar energy.

The solar energy heat utilization device used in daily life is mostly a vacuum tube heat collector, the full glass vacuum solar energy heat collection tube in the prior art is composed of an inner concentric glass tube and an outer concentric glass tube, a selective absorption coating with high absorption rate and low emissivity is deposited on the outer surface of the inner tube to form a heat absorber, high vacuum is pumped between the interlayer of the inner tube and the outer tube, the shape of the interlayer is like a slender thermos flask liner, the common circulating pipeline heat collecting pipe has the disadvantages of single opening, bidirectional mixed flow of heat transfer medium in the pipe, difficult discharge of heat transfer medium and impurity in the pipe, large resistance, low heat efficiency, incomplete utilization of heat energy, and the straight-through vacuum heat collecting pipe is not easy to freeze, so that the heat transfer medium in the pipe flows in a single direction, the heat transfer medium flows into the pipe from one end and flows out from the other end, the resistance is small, and the heat transfer medium and impurities are easy to drain. However, the inner glass tube of the straight-through vacuum heat collecting tube absorbs solar energy, and is relatively hot, the glass expands, the outer tube has lower temperature due to the existence of vacuum, and does not expand, so the vacuum tube breaks due to the stress of the vacuum tube, especially when the vacuum solar heat collecting tube is used outdoors, the temperature difference of the external environment in some areas is large, and the glass tube is more easily broken due to the difference of expansion caused by the temperature difference between the inner tube and the outer tube, thereby limiting the wide popularization and application of the vacuum heat collecting tube.

Disclosure of Invention

In view of the above problems, it is very important to invent a rupture-proof straight-through solar vacuum heat collecting tube, and in order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a straight-through solar vacuum heat collecting tube, includes inlayer glass pipe and outer glass pipe, and inlayer glass pipe and outer glass pipe are coaxial glass pipe, and sealed butt fusion is as an organic whole between the both ends of inlayer glass pipe and outer glass pipe simultaneously, is vacuum layer, its characterized in that in the middle of the two-layer glass pipe: the middle of the outer glass tube is provided with an annular notch, the annular notch is provided with a metal corrugated expansion joint, the outer glass tubes on two sides of the annular notch are provided with thickened side walls for being in sealing connection with the corrugated expansion joint, and a protective cover is arranged outside the corrugated expansion joint.

The utility model discloses technical scheme's further improvement lies in: the corrugated expansion joint is welded on the outer layer glass tube, and the distance from one end of the glass tube is not less than one third of the length of the glass tube.

The utility model discloses technical scheme's further improvement lies in: the corrugated expansion joint is a multilayer expansion joint, and the number of layers is not less than 3.

The utility model discloses technical scheme's further improvement lies in: the wave distance of the corrugated expansion node wave type is 5-7 mm, and the wave depth is 5-7 mm.

The utility model discloses technical scheme's further improvement lies in: the outer glass tube side wall thickness of annular breach department both sides reduces towards the direction of keeping away from the annular breach, is provided with the recess on the outer circumference of the lateral wall of thickening, and the recess block on safety cover and the outer glass tube is connected.

Due to the adoption of the technology, the utility model discloses the technological effect who gains does: the corrugated expansion joint is arranged on the outer-layer glass tube of the solar vacuum heat collecting tube, so that the problem that the glass vacuum heat collecting tube is easy to break when the temperature difference is large is solved; a protective cover is arranged outside the metal expansion joint, so that the expansion joint is prevented from being damaged due to rusting of the metal corrugated expansion joint in an outdoor severe environment, and the service cycle of the vacuum heat collecting pipe is prolonged; compared with the heat collecting pipe of the original circulating pipeline, the straight-through solar vacuum heat collecting pipe ensures that no old water or water dirt is accumulated in the glass pipe, the heat energy is fully utilized, and the heat efficiency is improved.

Drawings

FIG. 1 is a cross-sectional view of a straight-through solar vacuum heat collecting tube of the present invention;

FIG. 2 is an enlarged cross-sectional view of a corrugated expansion joint of a straight-through solar vacuum heat collecting tube of the present invention;

wherein, 1, outer layer glass tube, 2, inner layer glass tube, 3, ripple expansion joint, 4, safety cover.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

As shown in figures 1 and 2, a straight-through solar vacuum heat collecting tube comprises an inner layer glass tube 2 and an outer layer glass tube 1, wherein the inner layer glass tube 2 and the outer layer glass tube 1 are coaxial glass tubes, the two ends of the inner layer glass tube 2 and the outer layer glass tube 1 are sealed and welded into a whole, a vacuum layer is arranged between the two layers of glass tubes, an annular gap is arranged in the middle of the outer layer glass tube, a metal corrugated expansion joint 3 is arranged at the annular gap, the outer layer glass tubes 1 at the two sides of the annular gap are provided with thickened side walls for being in sealing connection with the corrugated expansion joint 3, a protective cover 4 is arranged outside the corrugated expansion joint 3, the corrugated expansion joint 3 is welded on the outer layer glass tube 1, the distance from one end of the glass tubes is not less than one third of the length of the glass tubes, the corrugated expansion joint 3 is a multilayer expansion joint, the number of layers is not less than 3, and the, the wave depth is 5-7 mm. The thickness of the side wall of the outer glass tube 1 on two sides of the annular gap is reduced towards the direction far away from the annular gap, a groove is arranged on the outer circumference of the thickened side wall, and the protective cover 4 is connected with the groove on the outer glass tube 1 in a clamping manner.

The straight-through solar vacuum heat collecting tube can be more conveniently used in the solar application fields of series or parallel connection, pressure bearing and non-pressure bearing.

Claims

1. The utility model provides a straight-through solar vacuum heat collecting tube, includes inlayer glass pipe (2) and outer glass pipe (1), and inlayer glass pipe (2) and outer glass pipe (1) are coaxial glass pipe, and sealed butt fusion is as an organic whole between the both ends of inlayer glass pipe (2) and outer glass pipe (1) simultaneously, is vacuum layer, its characterized in that in the middle of the two-layer glass pipe: the middle of the outer glass tube (1) is provided with an annular gap, the annular gap is provided with a metal corrugated expansion joint (3), the outer glass tubes (1) on two sides of the annular gap are provided with thickened side walls for being connected with the corrugated expansion joint (3) in a sealing mode, and a protective cover (4) is arranged outside the corrugated expansion joint (3).

2. A straight-through solar vacuum heat collecting tube according to claim 1, characterized in that: the corrugated expansion joint (3) is welded on the outer layer glass tube (1), and the distance from one end of the glass tube is not less than one third of the length of the glass tube.

3. A straight-through solar vacuum heat collecting tube according to claim 1, characterized in that: the corrugated expansion joint (3) is a multilayer expansion joint, and the number of layers is not less than 3.

4. A straight-through solar vacuum heat collecting tube according to claim 1, characterized in that: the wave distance of the wave form of the corrugated expansion joint (3) is 5-7 mm, and the wave depth is 5-7 mm.

5. A straight-through solar vacuum heat collecting tube according to claim 1, characterized in that: outer glass pipe (1) side wall thickness of annular breach department both sides reduces towards the direction of keeping away from the annular breach, is provided with the recess on the outer circumference of thickened lateral wall, and recess block on safety cover (4) and the outer glass pipe (1) is connected.