CN210861743U

CN210861743U - Full-glass vacuum tube, solar heat collector and solar air heat collector

Info

Publication number: CN210861743U
Application number: CN201921702094.1U
Authority: CN
Inventors: 马志刚; 李洪海
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-10-10
Filing date: 2019-10-10
Publication date: 2020-06-26
Anticipated expiration: 2029-10-10

Abstract

The utility model discloses a full glass vacuum tube, solar collector and solar energy air heat collector relates to the medium temperature heat utilization of solar energy technical field. Full glass vacuum tube includes outer pipe and inlayer pipe, the inner wall of outer pipe and the outer wall of inlayer pipe are at both ends sealing connection, in order to form confined vacuum cavity between the two, the outer wall of inlayer pipe is provided with and is used for absorbing the solar energy selectivity absorption coating of solar energy, the inlayer pipe is provided with a plurality of extending direction along it, extending structure includes the expansion section that one section pipe diameter diminishes gradually along inlayer pipe extending direction and one section pipe diameter grow gradually along inlayer pipe extending direction at least. The all-glass vacuum tube has larger ventilation or water flow, high heat energy transfer efficiency and difficult expansion and cracking caused by uneven heating.

Description

Full-glass vacuum tube, solar heat collector and solar air heat collector

Technical Field

The utility model relates to a medium temperature heat utilization technical field of solar energy, more specifically say, relate to a full glass vacuum tube, solar collector and solar energy air heat collector.

Background

The all-glass vacuum tube is applied to a solar heat collector or a solar air heat collector, and most of all-glass vacuum tubes in the current market are designed to be an inner layer and an outer layer with single openings, namely, one ends of the vacuum tubes are welded together, the other ends of the vacuum tubes are opened, and an interlayer of the inner tube and the outer tube is vacuumized and is sprayed with a solar selective absorption coating on the outer wall of the inner tube. As shown in fig. 1, when the all-glass vacuum tube is applied to a solar heat collector, water is used as a medium to absorb solar energy, a certain inclination angle needs to be ensured, heat is transferred in a natural convection manner, and the heat exchange speed is slow. Secondly, the design of the single opening ensures that when the water in the pipe generates gas at high temperature, the gas is not easy to discharge and the gas blockage phenomenon is easy to occur. As shown in figure 2, when the all-glass vacuum tube is applied to a solar air collector, air enters a collector header along the direction of an arrow, absorbs solar energy in the all-glass vacuum tube to be heated, and then flows out along the direction of the arrow to carry heat out. Therefore, research and development personnel develop a spiral vacuum tube with outlets at two ends, as shown in fig. 3 and 4, because the temperature of the glass inner tube is different from that of the glass outer tube when the spiral vacuum tube works, the temperature difference is large, the expansion amount of the glass inner tube is different, and the expansion amount of the glass inner tube in the longitudinal direction is far larger than that of the glass outer tube, so that the joint of the glass inner tube and the glass outer tube at two ends can be cracked. Therefore, the glass spring is made of the glass tube with the diameter of phi 10mm, the glass spring is compressed by the expansion of the glass inner tube, so that the total length of the glass inner tube (including the glass spring section) is not changed, and the joint of the glass outer tube and the glass inner tube cannot be burst. Fig. 3 is a schematic flow diagram of air or water, so that the spiral vacuum tube can take away heat by using the forced circulation action of a water pump or a fan, the heat transfer efficiency is improved to a certain extent, and the problem of air blockage is solved at the same time, however, the diameter of the glass inner tube is phi 10mm, the flow channel is narrow, the ventilation or water passing amount is small, and the heat transfer efficiency is still low; and the resistance of air flow and water flow is large, and the glass spring is easy to damage due to large stress. Therefore, the spiral vacuum tube is mostly applied to a solar air heat collector, and is rarely applied to a solar heat collector.

Therefore, how to manufacture an all-glass vacuum tube with an efficient heat transfer mode, which is not easy to accumulate gas and to be damaged, is a technical problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

For overcoming the problem that exists in the correlation technique at least to a certain extent, the utility model provides an all-glass vacuum tube, it both can be used for solar collector and can be applied to solar energy air heat collector.

The utility model discloses a realize through following technical scheme:

the utility model provides a full glass vacuum tube, including outer pipe and inlayer pipe, the inner wall of outer pipe with the outer wall of inlayer pipe is at both ends sealing connection, in order to form confined vacuum cavity between the two, the outer wall of inlayer pipe is provided with the solar energy selectivity absorption coating that is used for absorbing solar energy, the inlayer pipe is provided with a plurality of extending structure along its extending direction, extending structure includes at least that one section pipe diameter is followed inlayer pipe extending direction gradually diminishes shrink section and one section pipe diameter are followed inlayer pipe extending direction gradually enlarges expansion section.

Optionally, the telescopic structure is provided with a section of the contraction section and a section of the expansion section in sequence in the extending direction of the inner-layer pipe.

Optionally, the convergent section and the divergent section are symmetrically arranged about a cross section of the inner tube.

Optionally, there is a circular arc transition between the contraction section and the expansion section.

Optionally, the outer layer pipe and the inner layer pipe are arranged in a revolving body structure.

Optionally, the outer layer tube is set to be cylindrical with a diameter of 58cm, and the inner layer tube is set to be cylindrical with a diameter of 47 cm.

Optionally, the minimum diameter at the telescopic structure of the inner tube is set to 20 cm.

Optionally, the wall thickness of the inner tube is set to 2 mm.

A solar heat collector comprises two heat collector headers and a plurality of full-glass vacuum tubes, wherein two ends of each full-glass vacuum tube are respectively communicated with the two heat collector headers, one of the heat collector headers is provided with a water inlet, the other heat collector header is provided with a water outlet, and the full-glass vacuum tubes are any one of the full-glass vacuum tubes.

A solar air heat collector comprises two heat collector headers and a plurality of all-glass vacuum tubes, wherein two ends of each all-glass vacuum tube are respectively communicated with the two heat collector headers, one of the heat collector headers is provided with an air inlet, the other heat collector header is provided with an air outlet, and the all-glass vacuum tubes are any one of the above all-glass vacuum tubes.

The utility model provides a technical scheme can include following beneficial effect:

this full glass vacuum tube is through setting up a plurality of extending structure at inlayer pipe extending direction, extending structure includes that one section pipe diameter is followed shrink section and one section pipe diameter that inlayer pipe extending direction diminishes gradually along inlayer pipe extending direction grow gradually expansion section gradually, when being applied to solar collector or solar air heat collector, the inlayer pipe is followed its extending direction inflation and is made extending structure's shrink section and expansion section take place the fifty percent discount to the direction that is close to each other, so the total length of inlayer pipe does not change, can not oppress and take place the spalling at both ends to the outer pipe of being connected with it sealed. Meanwhile, by adopting the telescopic structure, the inner diameter of the telescopic structure can be made larger, so that larger ventilation or water flow can be obtained, the heat transfer efficiency is high, the resistance of air flow or water flow is smaller, and the damage is not easy to damage.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of water flow in a prior art single-opening all-glass evacuated tube used in a solar collector;

FIG. 2 is a schematic diagram showing the flow of water or air when a single-opening all-glass vacuum tube is applied to a solar heat collector or a solar air heat collector in the prior art;

FIG. 3 is a schematic diagram of the flow of water or air when a spiral vacuum tube is applied to a solar heat collector or a solar air heat collector in the prior art;

FIG. 4 is an enlarged view of a portion of the coil in the spiral vacuum tube of FIG. 3;

FIG. 5 is a longitudinal cross-sectional view of an all-glass vacuum tube shown in the first embodiment;

FIG. 6 is a longitudinal cross-sectional view of an all-glass vacuum tube shown in example two;

fig. 7 is a schematic diagram of the flow of water or air when the all-glass evacuated tube shown in some embodiments is applied to a solar collector or a solar air collector.

In the figure: 1-outer layer tube, 2-inner layer tube, 3-telescopic structure, 4-vacuum cavity, 5-solar selective absorption coating, 6-heat collector header, 31-contraction section and 32 expansion section.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus or methods consistent with certain aspects of the present invention.

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below do not limit the scope of the invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims. In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Referring to fig. 1-7, the present invention provides an all-glass vacuum tube, which comprises an outer tube 1 and an inner tube 2, wherein the outer tube 1 and the inner tube 2 are respectively connected in a sealing manner at the left and right ends, a vacuum cavity 4 is formed between the inner wall of the outer tube 1 and the outer wall of the inner tube 2, and the outer wall of the inner tube 2 is provided with a solar selective absorption coating 5. The inner tube 2 is provided with a plurality of telescopic structures 3 along the extending direction thereof, and the extending direction is from left to right. The telescopic structure 3 comprises at least one section of contraction section 31 and one section of expansion section 32, wherein the contraction section 31 gradually reduces along the extension direction pipe diameter of the inner-layer pipe 2, and the expansion section 32 gradually increases along the extension direction pipe diameter of the inner-layer pipe 2. The telescopic structure 3 can be provided with a contraction section 31 and then an expansion section 32 from left to right, and as shown in fig. 5, a structure which is concave towards the direction close to the center of the inner-layer pipe 2 is formed; the expanding section 32 and the contracting section 31 may be arranged from left to right, and as shown in fig. 6, the structure is concave outward away from the center of the inner tube 2. So set up, the part of the non-extending structure 3 of inlayer pipe 2 is heated and can compress extending structure 3 along its extending direction inflation length variation, makes shrink section 31 and expansion section 32 to the orientation fifty percent discount that is close to each other, so, the total length of inlayer pipe 2 does not change when being heated, can not cause the oppression to outer pipe 1 at both ends and junction of outer pipe 1, takes place the spalling. Meanwhile, by adopting the structure of concave or concave, the resistance is smaller compared with that of a spiral pipe when water or air is introduced. Meanwhile, the inner diameter can be made relatively large (the diameter of the glass spring in the glass spiral tube cannot be made large due to the structure of the glass spring and the connection structure of the glass spring with the inner layer tube and the outer layer tube, generally 10cm, as shown in figure 4), so that the ventilation volume or the water passing volume is large, and the heat transfer efficiency is high. The solar air heat collector can meet the requirements of large ventilation and water flow, and can be applied to solar heat collectors and solar air heat collectors. Wherein the outer layer pipe 1 and the inner layer pipe 2 can be connected and sealed at two ends through glass welding, and the telescopic structure 3 and the non-telescopic structure 3 of the inner layer pipe 2 are of an integrated structure.

Preferably, the contraction section 31 and the expansion section 32 are symmetrically arranged with respect to the cross section of the inner tube 2. As shown in fig. 5, the contracted section 31 and the expanded section 32 are in circular arc transition, and the connection between the contracted section 31 and the expanded section 32 and the part of the non-telescopic structure 3 in the inner tube 2 is also in circular arc transition. So set up, inlayer pipe 2 is when the thermal expansion, and the deformation that takes place when extending structure 3 receives the extrusion is more level and smooth, and the atress is more even, difficult damaged.

Wherein, the outer layer pipe 1 and the inner layer pipe 2 can be set as a revolving body structure, and the structure has small resistance to water flow or air flow; and is easy to manufacture and mold.

Specifically, the outer layer pipe 1 is set to be cylindrical with the diameter of 58cm, the non-telescopic structure 3 part of the inner layer pipe 2 is set to be cylindrical with the diameter of 47cm, the telescopic structures 3 can be distributed at equal intervals along the extending direction of the inner layer pipe 2, and the diameter of the minimum position is set to be 20 cm. Thus, a large ventilation or water flow can be ensured. The wall thickness of the inner tube 2 may be set to 2 mm.

The utility model also provides a solar heat collector, this solar heat collector is for adopting water to absorb solar energy as the medium. The solar heat collector comprises two heat collector headers 6 and a plurality of any one of the full-glass vacuum tubes, wherein two ends of each full-glass vacuum tube are respectively communicated with the two heat collector headers 6, one heat collector header 6 is provided with a water inlet, and the other heat collector header is provided with a water outlet. As shown in fig. 7, the solar heat collector can adopt a water pump to perform forced water circulation, the water flow is large, and the heat energy transfer efficiency is high. Solar collector is prior art, the utility model discloses only adopted the full glass vacuum tube of difference, other structures are no longer specifically repeated.

The utility model also provides a solar energy air heat collector, this solar energy air heat collector adopt the air to absorb solar energy as the medium, including two heat collector headers 6 and a plurality of above arbitrary all glass vacuum tubes, the both ends of each all glass vacuum tube are linked together with two heat collector headers 6 respectively, and a heat collector header 6 is provided with the air inlet, and another is provided with the gas outlet. As shown in fig. 7, the solar air heat collector can adopt a fan to perform forced air circulation, the air flow is large, and the heat energy transfer efficiency is high. Solar energy air heat collector is prior art, the utility model discloses only adopted the full glass vacuum tube of difference, other structures are no longer specifically repeated.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. The utility model provides an all-glass vacuum tube, its characterized in that includes outer pipe (1) and inlayer pipe (2), the inner wall of outer pipe (1) with the outer wall of inlayer pipe (2) be at both ends sealing connection, in order to form confined vacuum cavity (4) between the two, the outer wall of inlayer pipe (2) is provided with solar energy selective absorption coating (5) that are used for absorbing the sunlight energy, inlayer pipe (2) are provided with a plurality of extending structure (3) along its extending direction, extending structure (3) include at least that one section pipe diameter is followed inlayer pipe (2) extending direction shrink section (31) that gradually diminishes and a section pipe diameter is followed inlayer pipe (2) extending direction expansion section (32) that gradually enlarges.

2. The all-glass vacuum tube according to claim 1, wherein the telescopic structure (3) is provided with a section of the contraction section (31) and a section of the expansion section (32) in sequence in the extension direction of the inner tube (2).

3. The all-glass vacuum tube according to claim 2, characterized in that the contraction section (31) and the expansion section (32) are arranged symmetrically with respect to the cross section of the inner tube (2).

4. The all-glass vacuum tube as claimed in claim 3, wherein the constricted section (31) and the expanded section (32) have a circular arc transition therebetween.

5. The all-glass vacuum tube according to claim 4, characterized in that the outer tube (1) and the inner tube (2) are arranged in a solid of revolution configuration.

6. The all-glass vacuum tube as claimed in claim 5, characterized in that the outer tube (1) is arranged cylindrically with a diameter of 58cm and the inner tube (2) is arranged cylindrically with a diameter of 47 cm.

7. The all-glass vacuum tube as claimed in claim 6, characterized in that the minimum diameter at the telescopic structure (3) of the inner tube (2) is set to 20 cm.

8. The all-glass vacuum tube according to claim 7, characterized in that the wall thickness of the inner tube (2) is set to 2 mm.

9. A solar heat collector comprises two heat collector headers (6) and a plurality of full-glass vacuum tubes, wherein two ends of each full-glass vacuum tube are respectively communicated with the two heat collector headers (6), one of the heat collector headers (6) is provided with a water inlet, and the other heat collector header is provided with a water outlet, and the full-glass vacuum tubes are the full-glass vacuum tubes in any one of claims 1 to 8.

10. A solar air heat collector comprises two heat collector headers (6) and a plurality of full-glass vacuum tubes, wherein two ends of each full-glass vacuum tube are respectively communicated with the two heat collector headers (6), one of the heat collector headers (6) is provided with an air inlet, and the other heat collector header is provided with an air outlet, and the full-glass vacuum tubes are set as the full-glass vacuum tubes in any one of claims 1 to 8.