CN213931505U - Solar heat collecting pipe - Google Patents

Abstract

The utility model discloses a solar energy collection pipe. The glass tube and the metal tube are sequentially arranged from outside to inside, the outer tube wall of one section of the metal tube inserted in the glass tube is provided with a selective absorption coating, the glass tube comprises an outer glass tube and an inner glass tube which are connected, a vacuum layer is arranged between the outer glass tube and the inner glass tube, the metal tube is a straight-through tube, two ends of the metal tube, which are exposed out of the glass tube, are respectively provided with a sealing sleeve and a fixing piece used for pressing the sealing sleeve to the glass tube, the sealing sleeve is provided with an insertion slot, the glass tube is matched with the insertion slot, and the fixing piece is in threaded fit with the metal tube. The utility model discloses can reduce the processing degree of difficulty, improve heat resistance.

Description

Solar heat collecting pipe

Technical Field

The utility model relates to a solar energy collection pipe technical field, concretely relates to solar energy collection pipe.

Background

The solar heat collecting tube is divided into two types according to the material, wherein one type is the full-glass vacuum solar heat collecting tube, and the other type is the metal-glass vacuum solar heat collecting tube. Among them, the all-glass vacuum solar heat collecting tube has the disadvantages of poor pressure-bearing freezing resistance and easy frost cracking, so that the metal-glass vacuum solar heat collecting tube with excellent freezing resistance is widely applied.

The metal-glass solar vacuum heat collecting tube comprises a metal tube and a glass tube, wherein the metal tube is arranged in the glass tube, the surface of the metal tube is provided with a selective absorption coating, a vacuum layer is arranged between the metal tube and the glass tube, and two ends of the metal tube are sealed with two ends of the glass tube.

On one hand, the metal tube and the glass tube are difficult to seal because of the larger difference of the expansion coefficients of the metal tube and the glass tube, and the processing difficulty is increased; on the other hand, the metal tube and the glass tube with large difference of expansion coefficients have different expansion margins after temperature rise, so that the stress of the sealed part of the metal tube and the glass tube is increased, the sealed part of the metal tube and the glass tube is broken, and the heat resistance of the metal-glass solar vacuum heat collecting tube is poor.

Therefore, how to reduce the processing difficulty and improve the heat resistance is a technical problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model discloses it is not enough to the above-mentioned that prior art exists, provide a solar energy collection pipe, the utility model discloses can reduce the processing degree of difficulty, improve heat resistance.

In order to realize the purpose, the utility model discloses a technical scheme is:

the solar heat collecting tube comprises a glass tube and a metal tube which are sequentially arranged from outside to inside, wherein a selective absorption coating is arranged on the outer tube wall of one section of the metal tube inserted in the glass tube, the glass tube comprises an outer glass tube and an inner glass tube which are connected, a vacuum layer is arranged between the outer glass tube and the inner glass tube, the metal tube is a straight tube, sealing sleeves and fixing pieces used for pressing the sealing sleeves to the glass tube are arranged at two ends of the metal tube exposed out of the glass tube, the sealing sleeves are provided with slots, the glass tube is matched with the slots, and the fixing pieces are in threaded fit with the metal tube.

Furthermore, the fixing piece adopts a nut, external threads matched with the nut are arranged at two ends of the metal pipe, and a gasket is arranged between the nut and the sealing sleeve.

Furthermore, a first heat insulation pad is arranged between the sealing sleeve and the gasket.

Furthermore, both ends of the metal pipe are provided with limiting steps, the limiting steps are arranged on one side, away from the first heat insulation pad, of the sealing sleeve, and a second heat insulation pad is arranged between the limiting steps and the sealing sleeve.

Furthermore, the first heat insulation pad and the second heat insulation pad are both made of tetrafluoro pads.

Furthermore, the metal pipe is a stainless steel pipe.

The utility model discloses beneficial effect who has:

1. because the solar heat collecting pipe of the utility model does not need to carry out the sealing operation of the metal pipe and the glass pipe, on one hand, the processing difficulty is reduced, and the processing efficiency is improved; on the other hand, avoid when rising temperature, because the cracked condition of sealing-in department appears in tubular metal resonator and glass pipe because the coefficient of expansion difference is great, improved heat resistance, also improved the utility model discloses a solar energy collection pipe's operating stability has reduced the cost that the maintenance change consumes. In addition, the fixing piece is used on the metal tube, the glass tube is clamped between the two fixing pieces, the glass tube can be blocked by the two fixing pieces, the glass tube is prevented from moving along the axial direction of the metal tube, and therefore the metal tube and the glass tube are easy and reliable to assemble.

2. The utility model discloses an adopt the nut as the mounting, can conveniently draw materials, save the cost of drawing materials, it is convenient the utility model discloses a processing.

3. The utility model discloses a set up first heat insulating mattress, can reduce the heat that distributes out from the seal cover, reduce the heat and scatter and disappear, improve the thermal-arrest effect.

4. The utility model discloses a set up spacing step at the both ends of tubular metal resonator, set up the second heat insulating mattress between spacing step and seal cover, can utilize the second heat insulating mattress to improve sealed effect on the basis of the air bed between seal cover sealed tubular metal resonator and the glass pipe, reduce the heat and scatter and disappear, improve the thermal-arrest effect.

5. The utility model discloses a let first heat insulating mattress and second heat insulating mattress all adopt the tetrafluoro pad, can conveniently draw materials, sparingly draw materials the cost, further convenient the utility model discloses a processing.

6. The utility model discloses an adopt nonrust steel pipe as the tubular metal resonator, not only can conveniently draw materials, can also utilize the good corrosion resisting property of nonrust steel pipe, prolong the utility model discloses a life further reduces the maintenance cost.

Drawings

FIG. 1 is a schematic structural view of a solar heat collecting tube;

FIG. 2 is a full sectional view taken at line A-A of FIG. 1;

FIG. 3 is a half sectional view taken at line A-A of FIG. 1;

FIG. 4 is a partial schematic view of FIG. 2;

FIG. 5 is a schematic view of the structure of a glass tube;

FIG. 6 is a schematic structural view of a metal tube;

figure 7 is a schematic view of the construction of the gland;

FIG. 8 is a schematic view of the nut;

FIG. 9 is a cross-sectional view taken at FIG. 8B-B;

FIG. 10 is a schematic view of a first insulation mat;

FIG. 11 is a schematic view of a second insulation mat.

Description of reference numerals:

1-glass tube, 11-outer glass tube, 12-inner glass tube, 13-vacuum layer, 2-metal tube, 21-external thread, 22-limiting step, 3-sealing sleeve, 31-slot, 4-nut, 5-gasket, 6-first heat insulation pad, and 7-second heat insulation pad.

Detailed Description

For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings. It is noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. 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, but 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 thus, should not be construed as limiting the present invention.

Example (b):

as shown in fig. 1 to 4, a solar heat collecting tube comprises a glass tube 1 and a metal tube 2 which are arranged in sequence from outside to inside.

As shown in fig. 5, the glass tube 1 comprises an outer glass tube 11 and an inner glass tube 12 connected with each other, and a vacuum layer 13 is provided between the outer glass tube 11 and the inner glass tube 12.

As shown in fig. 6, the metal pipe 2 is a straight pipe, and the metal pipe 2 is made of a stainless steel pipe. The outer tube wall of the section of the metal tube 2 inserted into the glass tube 1 is coated with a selective absorption coating, as shown in fig. 3, the two ends of the metal tube 2 exposed out of the glass tube 1 are both provided with external threads 21. The two ends of the metal tube 2 inserted in the glass tube 1 are welded with limit steps 22.

As shown in fig. 2, the sealing sleeves 3 are disposed at two ends of the metal tube 2 exposed out of the glass tube 1, as shown in fig. 7, the sealing sleeves 3 are disposed with slots 31, as shown in fig. 4, the slots 31 are used for inserting the glass tube 1.

As shown in fig. 2, the metal tube 2 is provided with fixing members at both ends exposed out of the glass tube 1, the fixing members are nuts 4, the nuts 4 are as shown in fig. 8 and 9, the nuts 4 are engaged with external threads 21 provided on the metal tube 2, and after the nuts 4 are screwed on the external threads 21 at both ends of the metal tube 2, the sealing sleeve 3 can be pressed against the glass tube 1. A gasket 5 is arranged between the nut 4 and the sealing sleeve 3.

As shown in fig. 4, a first insulating mat 6, as shown in fig. 10, is provided between the sealing sleeve 3 and the gasket 5. A second insulating pad 7 as shown in fig. 11 is arranged between the limit step 22 and the sealing sleeve 3. The first heat insulation pad 6 and the second heat insulation pad 7 are made of tetrafluoro pads.

When assembling a solar heat collecting tube of the present embodiment, the following operations are required: (1) the worker inserts the metal tube 2 into the glass tube 1; (2) the two ends of the metal pipe 2 are sleeved with second heat insulation pads 7; (3) the sealing sleeves 3 are sleeved on the two ends of the metal pipe 2, so that the two ends of the glass pipe 1 are inserted into the slots 31 on the sealing sleeves 3, and the second heat insulation pad 7 is clamped between the limiting step 22 and the sealing sleeves 3; (3) the two ends of the metal pipe 2 are sleeved with first heat insulation pads 6; (4) sleeving gaskets 5 on two ends of the metal pipe 2, and clamping a first heat insulation pad 6 between the gaskets 5 and the sealing sleeve 3; (5) the nuts 4 are screwed to both ends of the metal pipe 2 to press the spacer 5 against the first heat insulating mat 6, whereby the installation is completed.

Through the above process, it can be known that: because the solar heat collecting tube of the embodiment does not need to carry out the sealing operation of the metal tube 2 and the glass tube 1, on one hand, the processing difficulty is reduced, and the processing efficiency is improved; on the other hand, the situation that the sealing part is broken due to the large difference of the expansion coefficients of the metal tube 2 and the glass tube 1 during temperature rise is avoided, the heat resistance is improved, the operation stability of the solar heat collecting tube is improved, and the cost consumed by maintenance and replacement is reduced.

In addition, as shown in fig. 2, two nuts 4 serving as fixing members are used for the metal tube 2, and the glass tube 1 is sandwiched between the two fixing members, so that the glass tube 1 is blocked by the two fixing members, and the glass tube 1 is prevented from moving in the axial direction of the metal tube 2, and the metal tube 2 and the glass tube 1 can be assembled easily and reliably.

The heat collecting principle of the solar heat collecting tube of the embodiment is as follows: after the selective absorption coating on the surface of the metal tube 2 directly absorbs the heat of sunlight, the heat-conducting medium in the metal tube 2 is heated, the heat transfer efficiency is high, and the heat loss is reduced. The glass tube 1 sleeved outside the metal tube 2 reduces heat loss from the metal tube 2, and the sealing sleeve 3 is used for reducing heat loss from an air layer between the metal tube 2 and the glass tube 1, so that the heat collection effect of the solar heat collection tube is improved.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (6)

1. The solar heat collecting tube comprises a glass tube and a metal tube which are sequentially arranged from outside to inside, wherein a selective absorption coating is arranged on the outer tube wall of one section of the metal tube inserted in the glass tube.

2. The solar heat collecting pipe as claimed in claim 1, wherein the fixing member is a nut, both ends of the metal pipe are provided with external threads matched with the nut, and a gasket is arranged between the nut and the sealing sleeve.

3. The solar energy heat collecting pipe as claimed in claim 2, wherein a first heat insulating pad is provided between the sealing sleeve and the gasket.

4. The solar heat collecting pipe as claimed in claim 3, wherein the metal pipe is provided at both ends thereof with a limiting step, the limiting step is provided at a side of the sealing sleeve away from the first heat insulating pad, and a second heat insulating pad is provided between the limiting step and the sealing sleeve.

5. The solar heat collecting pipe as claimed in claim 4, wherein the first and second heat insulating mats are made of tetrafluoro mat.

6. The solar heat collecting tube as claimed in claim 1, wherein the metal tube is a stainless steel tube.

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