1. An all-glass evacuated medium-high temperature collector tube comprises an outer tube, an inner tube, a finned tube and an end cover;

the outer tube is made of glass materials, and two ends of the outer tube are open;

the inner tube is made of glass material, and two ends of the inner tube are open;

the inner pipe is positioned in the outer pipe, and two ends of the inner pipe are respectively connected with two corresponding ends of the outer pipe in a sealing manner;

a vacuum interlayer is arranged between the inner pipe and the outer pipe, the vacuum interlayer is vacuumized, and a getter is arranged in the vacuum interlayer;

the inner pipe is of a wavy structure as a whole;

the end covers are assembled at the two ends of the inner pipe;

the finned tube is located inside the inner tube, and two ends of the finned tube penetrate through the end cover.

2. The all-glass evacuated medium-high temperature collector tube according to claim 1, characterized in that: the outer wall of the inner pipe is coated with a selective absorption coating.

3. The all-glass evacuated medium-high temperature collector tube according to claim 1, characterized in that: an elastic supporting clamp is arranged between the inner pipe and the outer pipe, one end of the elastic supporting clamp is in lap joint with the outer wall of the inner pipe, and the other end of the elastic supporting clamp is in lap joint with the inner wall of the outer pipe.

4. The all-glass evacuated medium-high temperature collector tube according to claim 3, characterized in that: the getter is arranged on the elastic supporting card.

5. The all-glass evacuated medium-high temperature collector tube according to claim 1, characterized in that: the inner diameter of the outer tube remains uniform.

6. The all-glass evacuated medium-high temperature collector tube according to claim 1, characterized in that: the inner pipe is made of a die by adopting a pressing method process.

7. The all-glass evacuated medium-high temperature collector tube according to claim 1, characterized in that: the fusion sealing connection positions of the two ends of the inner pipe and the two ends of the outer pipe are of a fillet structure.

8. The all-glass evacuated medium-high temperature collector tube according to claim 1, characterized in that: the finned tube is made of a metal material.

9. The all-glass evacuated medium-high temperature collector tube according to claim 1, characterized in that: fins at two ends of the finned tube extend along the radial direction of the finned tube and are abutted against the inner wall of the inner tube.

10. The all-glass evacuated medium-high temperature collector tube according to claim 1, characterized in that: the end cap is made of a thermally insulating material.

Background

At present, solar heat collecting pipes have been developed for more than thirty years and are widely applied to solar heat utilization. Solar collector tubes are generally of double tube (outer and inner) design. According to the opening mode, the solar heat collecting pipe is divided into a single-end opening mode and a two-end opening mode. The solar heat collecting pipe with the single end open is generally applied to medium and low temperature working conditions, and the outer pipe and the inner pipe can be both glass pipes, so that the product cost of the heat collecting pipe is reduced. The solar energy collection pipe of both ends open-ended is generally applied to medium and high temperature operating mode, and the outer tube generally adopts the glass pipe, and the inner tube generally adopts the metal pipe, if outer tube, inner tube all adopt the glass pipe, then the body of double-deck pipe body is heated the inflation and is caused the body to break easily at medium and high temperature operating mode. The inner tube adopts the metal tube can avoid the body thermal expansion to break, nevertheless leads to the cost of thermal-collecting tube product higher. In addition, the limited daylighting area of the solar heat collecting pipe applied to the medium-high temperature working condition at present can not be fully utilized, so that the heat utilization rate of solar energy is low.

Disclosure of Invention

The invention aims to provide an all-glass evacuated medium-high temperature heat collecting tube, which is applied to medium-high temperature working conditions, wherein the inner tube and the outer tube are made of glass materials, so that the tube body is prevented from being broken due to thermal expansion, the daylighting area is fully utilized, and the heat utilization rate of solar energy is improved.

In order to achieve the above purpose, the technical solution adopted by the invention is as follows:

an all-glass evacuated medium-high temperature collector tube comprises an outer tube, an inner tube, a finned tube and an end cover;

the outer tube is made of glass materials, and two ends of the outer tube are open;

the inner tube is made of glass material, and two ends of the inner tube are open;

the inner pipe is positioned in the outer pipe, and two ends of the inner pipe are respectively connected with two corresponding ends of the outer pipe in a sealing manner;

a vacuum interlayer is arranged between the inner pipe and the outer pipe, the vacuum interlayer is vacuumized, and a getter is arranged in the vacuum interlayer;

the inner pipe is of a wavy structure as a whole;

the end covers are assembled at the two ends of the inner pipe;

the finned tube is located inside the inner tube, and two ends of the finned tube penetrate through the end cover.

Preferably, the outer wall of the inner tube is coated with a selective absorption coating.

Preferably, an elastic supporting clamp is arranged between the inner pipe and the outer pipe, one end of the elastic supporting clamp is lapped on the outer wall of the inner pipe, and the other end of the elastic supporting clamp is lapped on the inner wall of the outer pipe.

Preferably, the getter is arranged on the elastic support card.

Preferably, the inner diameter of the outer tube remains uniform.

Preferably, the inner pipe is manufactured by a pressing process through a mould.

Preferably, the fusion sealing connection positions of the two ends of the inner pipe and the two ends of the outer pipe are of a fillet structure.

Preferably, the finned tube is made of a metallic material.

Preferably, the fins at both ends of the finned tube are abutted against the inner wall of the inner tube along the radial extension of the finned tube.

Preferably, the end cap is made of a thermally insulating material.

The beneficial technical effects of the invention are as follows:

the all-glass evacuated medium-high temperature collector tube can be applied to medium-high temperature working conditions, and the inner tube and the outer tube are made of glass materials, so that the product cost is greatly reduced; under the working condition of medium and high temperature, the inner pipe is extruded by the elongation deformation of the pipe body generated by heating, and the inner pipe in a wavy structure contracts to buffer the elongation deformation so as to avoid the pipe body from being cracked due to expansion of the pipe body; under the condition that the size of the outer pipe is kept unchanged, the inner pipe is of a wavy structure, the light receiving area of the inner pipe can be increased, the daylighting area is fully utilized, the heat utilization rate of solar energy is obviously improved, the heat collection cost is reduced, and the inner pipe is applied to a heat collection system to further improve the heat collection efficiency of the heat collection system at the effective working temperature.

Drawings

FIG. 1 is a schematic structural diagram of an all-glass evacuated medium-high temperature collector tube according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of an outer tube, an inner tube and the like of the all-glass evacuated medium-high temperature collector tube according to the embodiment of the invention;

FIG. 3 is a schematic structural view of a finned tube in the all-glass evacuated medium-high temperature collector tube according to the embodiment of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings in combination with the specific embodiments. Certain embodiments of the invention now will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. Indeed, various embodiments of the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements.

In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In an embodiment of the present invention, an all-glass evacuated medium-high temperature collector tube is provided, please refer to fig. 1 to 3.

An all-glass evacuated medium-high temperature collector tube comprises an outer tube 1, an inner tube 2, a finned tube 3, an end cover 4 and the like.

The outer tube 1 is made of a glass material, and both ends of the outer tube 1 are open. The inner tube 2 is made of a glass material, and both ends of the inner tube 2 are open. The inner tube 2 is located the inside of outer tube 1, and the one end of inner tube 2 is sealed with the one end of outer tube 1 and is connected, and the other end of inner tube 2 is sealed with the other end of outer tube 1 and is connected. The fusion sealing connection positions of the two ends of the inner pipe 2 and the two ends of the outer pipe 1 are of a fillet structure.

A vacuum interlayer 5 is arranged between the inner pipe 2 and the outer pipe 1, and the vacuum interlayer 5 is vacuumized. After the heated medium in the finned tube 3 is heated, the vacuum interlayer 5 can realize vacuum heat preservation and reduce heat loss. A getter 6 is arranged in the vacuum interlayer 5, and the getter 6 is used for maintaining the vacuum degree of the vacuum interlayer 5.

Set up elastic support card 7 between inner tube 2 and the outer tube 1, the outer wall of the one end overlap joint inner tube 2 of elastic support card 7, the inner wall of the other end overlap joint outer tube 1 of elastic support card 7. The getter 6 is disposed on the elastic support card 7 to fix the getter 6.

The inner diameter of the outer pipe 1 is kept consistent, and the whole body is in a straight cylindrical structure. The whole wavy structure that is of inner tube 2, it is concrete, along the extending direction of inner tube 2, the lateral wall shape of inner tube 2 arranges according to the rule of radially protruding back sunken again along inner tube 2, protruding end and sunken end are circular-arc structure.

The inner tube 2 is made of a wavy die by a pressing process, so that the manufacturing of the inner tube 2 is simplified, and the production cost is reduced.

Under the high temperature operating mode, the extension deformation extrusion inner tube 2 that body (mainly be outer tube 1) was heated and is produced, is in order to cushion extension deformation by the inner tube 2 shrink that is wavy structure to avoid the body to take place the inflation and cause the body to break. The convex tail end and the concave tail end of the side wall of the inner pipe 2 are of arc-shaped structures, so that the inner pipe 2 can be prevented from being broken when the inner pipe 2 is greatly contracted.

In addition, under the condition that the size of the outer pipe 1 is kept unchanged, the inner pipe 2 is of a wavy structure, the inner diameter of the inner pipe 2 is kept consistent, the light receiving area of the inner pipe 2 can be increased, the daylighting area is fully utilized, and the heat utilization rate of solar energy is obviously improved.

The outer wall of the inner tube 2 is coated with a selective absorption coating, so that the absorption capacity of the inner tube 2 and the finned tube 3 on solar radiation energy is improved, and the heat utilization rate of the solar energy is further improved.

The two ends of the inner pipe 2 are both provided with end covers 4, wherein the end covers 4 are made of heat insulation materials, and the end covers 4 are used for realizing heat preservation and heat insulation of the inner pipe 2, the finned pipes 3 and heated media in the finned pipes 3 and reducing heat loss.

The finned tube 3 is positioned inside the inner tube 2, and both ends of the finned tube 3 penetrate through the end covers 4. The medium to be heated flows in from one end of the finned tube 3 and flows out from the other end of the finned tube 3, and is heated while flowing through the finned tube 3.

The finned tube 3 is made of a metal material and has good heat conduction performance so as to efficiently transfer heat to a heated medium in the finned tube 3.

Fins 31 at both ends of the finned tube 3 extend in the radial direction of the finned tube 3 to abut against the inner wall of the inner tube 2. On the one hand, the assembly limiting device is used for limiting the assembly of the finned tube 3 and the inner tube 2, and on the other hand, the fins 31 at the two ends of the finned tube 3 can block the inner cavity of the inner tube 2, so that heat at the two ends of the inner cavity of the inner tube 2 is more transferred to the fins 31 and a heated medium, and the heat loss is reduced.

Up to this point, the present embodiment has been described in detail with reference to the accompanying drawings. From the above description, those skilled in the art should clearly understand that the all-glass evacuated medium-high temperature collector tube of the present invention. The all-glass evacuated medium-high temperature collector tube can be applied to medium-high temperature working conditions, and the inner tube 2 and the outer tube 1 are made of glass materials, so that the product cost is greatly reduced; under the working condition of medium and high temperature, the inner pipe 2 is extruded by the elongation deformation generated by heating the pipe body, and the inner pipe 2 in a wavy structure contracts to buffer the elongation deformation so as to avoid the pipe body from being cracked due to expansion of the pipe body; under the condition that the size of the outer pipe 1 is kept unchanged, the inner pipe 2 is of a wavy structure, the light receiving area of the inner pipe 2 can be increased, the daylighting area is fully utilized, the heat utilization rate of solar energy is obviously improved, the heat collection cost is reduced, and the inner pipe is applied to a heat collection system to further improve the heat collection efficiency of the heat collection system at the effective working temperature.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.