Solar collector and its sealing connection structure of heat collecting tube and header

Abstract

The present application relates to a solar thermal collector and a sealed connection structure of a heat collecting tube and a header, wherein the heat collecting tube connection hole is connected to the water cavity inside the header, the heat pipe extension end of the heat collecting tube extends into the water cavity, a metal ring gasket is fixedly arranged on the heat pipe of the heat collecting tube, an outer screw sleeve with an inner thread on the inner circumference and an inner screw sleeve with an outer thread on the outer circumference axially seal and clamp the metal ring gasket, thereby realizing a sealed connection between the heat collecting tube, especially the heat pipe in the heat collecting tube, and the header. The present application improves the light-water photothermal conversion efficiency of the solar thermal collector and enhances the sealing effect of the connection between the heat collecting tube and the header.

Description

Technical Field

[0001] The present application relates to the field of solar energy utilization, and in particular to a solar thermal collector and a sealed connection structure of a heat collecting tube and a header thereof. Background Art

[0002] Solar energy, as a renewable energy source, has been widely used, such as photovoltaic power generation, solar thermal heating, and solar thermal power generation. Solar energy is also the main direction for the development of green energy in the future. There are two technical approaches to using solar energy: photovoltaic power generation and solar thermal heating. Photovoltaic power generation usually refers to the technology of converting collected solar energy into electrical energy, and solar thermal heating usually refers to the technology of converting collected solar energy into usable thermal energy.

[0003] The Chinese invention patent application with patent number CN202010321847.5 discloses a photovoltaic-thermal device, including: a base frame, a water flow tank (junction box) fixed on the base frame, and a heat collecting tube connected to the base frame. The heat collecting tube can be divided into two structural forms: water-flowing and non-water-flowing. The heat collecting tube with water flow needs to be inserted into the water flow tank to be directly connected with the water cavity, while the heat collecting tube without water flow (vacuum heat collecting tube) is inserted into the water flow tank, but usually not connected with the water cavity. Specifically, the heat collecting tube without water flow mainly includes: a vacuum tube body, a heat-absorbing coating coated on the tube wall of the vacuum tube body, and a heat pipe movably arranged in the inner tube. The heat pipe includes a heat pipe protruding end (heat conducting tube protruding end) that extends out of the vacuum tube body and is inserted into the water flow tank. Refer to the attachment of the patent application document. Figure 7 Although the extended end of the heat pipe is inserted into the water tank, it is not directly connected to the inner cavity of the water tank. A heat-conducting sleeve is sealed inwardly at the wall of the water tank, and the extended end of the heat pipe is inserted into the heat-conducting sleeve and contacts the heat-conducting sleeve. When working, the heat pipe transfers heat to the heat-conducting sleeve, and the heat-conducting sleeve then transfers the heat it obtains to the water in the water tank that is in direct contact with the heat-conducting sleeve. The heat of the heat pipe can only be transferred to the water in the water tank with the help of the heat-conducting sleeve, and cannot be directly transferred to the water in the water tank. The light-to-water photothermal conversion efficiency is low.

[0004] In addition, the above patent application document also introduces a "sealed insertion" method in which the protruding end of the heat pipe is in direct contact with the water in the water tank: the protruding end of the heat pipe inserted in the water tank is in direct contact with the water in the water tank, and the sealing ring is used to maintain the seal of the joint between the heat pipe end body and the water tank to prevent water leakage.

[0005] However, there are the following problems with using sealing rings for sealing:

[0006] 1. The sealing ring in the above device has two sealing surfaces, one is the seal between the outer peripheral surface of the sealing ring and the water tank, and the other is the seal between the inner peripheral surface of the sealing ring and the outer side of the heat pipe, that is, there are two possible water leakage positions when the sealing ring is used for sealing.

[0007] 2. The sealing of the sealing ring is usually based on the elasticity of its material, and the pre-tightening force is generated by the deformation of the interference fit with the sealing surface. The aforementioned pre-tightening force is obtained by radially squeezing the sealing ring outward by the heat pipe. When the photovoltaic-thermal device is actually used, the temperature change range in the water tank and on the heat pipe is large. Working in such an environment, the sealing ring will accelerate aging. In the later use, the sealing ring will produce problems such as pre-tightening force attenuation due to aging, which will cause poor sealing and fixing effects, and eventually leaks.

[0008] This application arises from this. Summary of the invention

[0009] The technical problem to be solved by the present application is: in view of the above problems, a sealed connection structure of a solar thermal collector and its collector tube and a header is proposed, so as to improve the light-to-water thermal conversion efficiency of the solar thermal collector while enhancing the sealing effect of the connection between the collector tube and the header.

[0010] The technical solution of this application is:

[0011] A sealed connection structure of a heat collecting tube and a header of a solar collector, wherein the heat collecting tube comprises a vacuum tube body and a heat pipe inserted into the vacuum tube body, a heat collecting tube connection hole is formed on the wall of the header, and the heat pipe comprises a heat pipe extension end extending out of the vacuum tube body and inserted into the heat collecting tube connection hole.

[0012] The heat collecting pipe connection hole is in communication with the water cavity inside the header, and the extended end of the heat pipe extends into the water cavity;

[0013] The sealing connection structure also includes:

[0014] An outer screw sleeve with an inner thread on its inner circumference, the outer screw sleeve is fixed in the heat collecting pipe connection hole, and the outer circumference of the outer screw sleeve is sealed with the hole wall of the heat collecting pipe connection hole, and the axial inner side end of the outer screw sleeve is integrally provided with a circle of radially inwardly convex first annular inner flange;

[0015] A copper ring gasket, wherein the copper ring gasket is fixedly sleeved outside the heat pipe, and the inner circumference of the copper ring gasket is sealed with the outer circumference of the heat pipe, the heat pipe passes through the outer screw sleeve, and the copper ring gasket is located inside the outer screw sleeve; and

[0016] An inner screw sleeve with an external thread on its outer circumference is movably sleeved outside the heat pipe, and the inner screw sleeve is threadably matched with the outer screw sleeve and locked into the outer screw sleeve, and the copper ring gasket is axially sealed and clamped between the inner screw sleeve and the first annular inner flange.

[0017] Based on the above technical solutions, this application also includes the following preferred solutions:

[0018] The axial outer end surface of the first annular inner flange and the axial inner end surface of the inner threaded sleeve include conical surfaces that cooperate with each other to clamp the copper ring gasket.

[0019] The outer peripheral surface of the outer screw sleeve is sealed and welded to the hole wall surface of the heat collecting pipe connecting hole.

[0020] The heat collecting pipe connection hole is a flanged hole, and the outer screw sleeve is fixed to the flange of the flanged hole by welding.

[0021] The inner circumference of the copper ring gasket is sealed and welded to the outer circumference of the heat pipe.

[0022] The inner hole of the copper ring gasket is a flanged hole, and the heat pipe is fixed to the flange of the flanged hole by welding.

[0023] A rubber sealing ring is sandwiched between the copper ring gasket and the first annular inner flange.

[0024] The inner hole diameter of the first annular inner flange is larger than the diameter of the extended end of the heat pipe.

[0025] The axial inner side end of the inner thread sleeve is integrally provided with a circle of radially inwardly convex second annular inner flange.

[0026] A solar thermal collector comprises the above-mentioned sealed connection structure.

[0027] Beneficial effects of this application:

[0028] 1. The present application extends the heat pipe of the vacuum heat collecting pipe directly into the water cavity inside the header, so as to directly contact the water in the header, thereby improving the light-to-water photothermal conversion efficiency of the solar collector.

[0029] 2. The connection between the collector tube and the header is equipped with a specially designed rigid sealing structure, which effectively prevents water from overflowing from the connection between the two, eliminates the aging problem of the traditional flexible sealing ring type sealing structure, and is very convenient to assemble and disassemble.

[0030] 3. The outer screw sleeve and the opposite side of the inner screw sleeve are provided with mutually matching conical surfaces to clamp the copper ring gasket fixed on the heat pipe in the middle, which increases the sealing area between the copper ring gasket and the inner and outer screw sleeves and improves the sealing effect. Moreover, during assembly, the copper ring gasket is squeezed and deformed as the locking depth of the inner screw sleeve increases, thereby eliminating the gap that may exist in the rigid fit.

[0031] 4. The heat collector pipe connection hole is set as a flanged hole with a flange. After the outer screw sleeve is inserted into the heat collector pipe connection hole, the flange of the heat collector pipe connection hole is welded and fixed to the inner outer screw sleeve by laser welding technology, so that the outer peripheral surface of the outer screw sleeve and the wall surface of the heat collector pipe connection hole are mutually welded and sealed. This not only facilitates the welding of the outer screw sleeve and the heat collector pipe connection hole, but also realizes the rigid sealing match between the outer peripheral surface of the outer screw sleeve and the wall surface of the heat collector pipe connection hole.

[0032] 5. The inner hole of the copper ring gasket is set as a flanged hole structure. After the copper ring gasket is put on the required position on the heat pipe, the flange of the inner hole of the copper ring gasket is welded and fixed to the heat pipe by laser welding process, so that the inner circumference of the copper ring gasket and the outer circumference of the heat pipe are mutually fused and sealed. This not only facilitates the welding of the copper ring gasket and the heat pipe, but also realizes the rigid sealing cooperation between the inner hole of the copper ring gasket and the heat pipe.

[0033] 6. The inner hole diameter of the inner flange at the end of the outer screw sleeve is set to be larger than the diameter of the extended end of the heat pipe. During assembly, first complete the welding of the outer screw sleeve and the connecting hole of the heat collecting pipe, then pass the heat pipe with the inner screw sleeve inward through the inner hole of the outer screw sleeve, so that the extended end of the heat pipe extends into the water cavity of the header. After that, rotate the inner screw sleeve, and set the copper ring gasket sealing clamp welded and fixed on the heat pipe between the inner screw sleeve and the first annular inner flange. Then, the vacuum tube body is sheathed outside the heat pipe. It is convenient to assemble the heat collecting pipe and the header.

[0034] 7. A circle of radially inwardly convex annular inner flange is integrally provided at the axial inner side end of the inner screw sleeve. On the one hand, the supporting area of ​​the inner screw sleeve for the copper ring gasket is increased, and the possibility of collapse and deformation of the copper ring gasket due to force is reduced. On the other hand, the risk of foreign objects contacting and damaging the copper ring gasket is also reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present application, rather than limiting the present application.

[0036] Figure 1 It is an overall schematic diagram of the solar thermal collector in Example 1 of the present application.

[0037] Figure 2 yes Figure 1 Cross-sectional view of .

[0038] Figure 3 yes Figure 2 An enlarged view of the X1 section.

[0039] Figure 4 yes Figure 2 Enlarged view of the X2 section.

[0040] Figure 5 This is a schematic diagram of the heat pipe structure in a heat collecting tube in an implementation of the present application.

[0041] Figure 6 It is a three-dimensional schematic diagram of a copper ring gasket in an implementation of the present application.

[0042] Figure 7 It is a cross-sectional schematic diagram of a copper ring gasket in one embodiment of the present application.

[0043] Figure 8 It is a three-dimensional schematic diagram of an external screw sleeve in an implementation of the present application.

[0044] Fig. 9 It is a cross-sectional schematic diagram of an external screw sleeve in an implementation of the present application.

[0045] Fig.10 It is a three-dimensional schematic diagram of an inner thread sleeve in one embodiment of the present application.

[0046] Fig.11 It is a cross-sectional schematic diagram of an inner threaded sleeve in one embodiment of the present application.

[0047] Fig.12 It is a schematic diagram of the heat pipe structure in the heat collecting tube in the second implementation of this application.

[0048] Fig.13 It is an enlarged cross-sectional view of the connection between the collector tube and the header in the second implementation of the present application.

[0049] Fig.14 It is a three-dimensional schematic diagram of the copper ring gasket in the second implementation of this application.

[0050] Fig.15 It is a cross-sectional schematic diagram of the copper ring gasket in the second embodiment of the present application.

[0051] Fig.16 It is a cross-sectional schematic diagram of the outer screw sleeve in the second embodiment of the present application.

[0052] Fig.17 It is a cross-sectional schematic diagram of the inner threaded sleeve in the second embodiment of the present application.

[0053] in:

[0054] a-heat collecting tube, b-header, 1-vacuum tube body, 2-heat pipe, 3-water cavity, 4-heat collecting tube connection hole, 5-external screw sleeve, 6-internal screw sleeve, 7-copper ring gasket, 8-rubber sealing ring;

[0055] 101 - outer tube, 102 - inner tube, 201 - protruding end of the heat pipe, 401 - flange of the heat collecting tube connection hole, 501 - first annular inner flange, 601 - second annular inner flange, 602 - third annular inner flange, 701 - flange of the copper ring gasket. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be clearly and completely described below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0057] Unless otherwise defined, the technical terms or scientific terms used herein shall have the common meanings understood by persons with ordinary skills in the field to which this application belongs. The words "one" or "an" and the like used in the patent application specification and claims of this application do not indicate a quantity limitation, but indicate the existence of at least one.

[0058] In the description of the specification and claims of this application, the terms "upper", "lower", "horizontal", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the present application.

[0059] Now, specific embodiments of the present application are described with reference to the accompanying drawings.

[0060] Embodiment 1:

[0061] Reference Figures 1 to 11 As shown, the solar collector of the present application also includes the heat collecting tube a and the header b of the traditional solar collector. There are multiple heat collecting tubes a, and only one is shown in the figure for the convenience of drawing. The heat collecting tube a adopts a vacuum heat collecting tube that does not flow water, which includes: a vacuum tube body 1 composed of an outer tube 101 and an inner tube 102 (a vacuum environment is between the inner and outer tubes) that are coaxially fixedly connected, a heat absorbing coating attached to the wall of the inner tube, and a heat pipe 2 inserted in the inner tube and wrapped with a heat-conducting aluminum foil on the periphery. Phase change material is encapsulated inside the heat pipe 2. The interior of the header b is a water cavity 3 for water flow, and a heat collecting tube connection hole 4 for connecting the heat collecting tube is formed on the wall of the header b. The aforementioned heat pipe 2 has a heat pipe extension end 201 extending out of the vacuum tube body 1, and the heat pipe extension end 201 is inserted into the heat collecting tube connection hole 4.

[0062] The key improvement of this embodiment is that the heat collecting pipe connection hole 4 is a through hole communicating with the water cavity 3 inside the header, and the heat pipe extension end 201 passes through the heat collecting pipe connection hole 4 and extends into the water cavity 3. When working, the heat pipe extension end 201 is in direct contact with the water in the water cavity 3, so that the heat is transferred to the water in the header more quickly, thereby improving the heat collection efficiency.

[0063] Because the heat pipe 2 is inserted into the water cavity 3 and directly contacts the water, it is necessary to ensure that the heat pipe 2 is sealed with the heat collecting pipe connection hole 4, otherwise there will be a water leakage problem. Based on this, the present embodiment is also equipped with an outer screw sleeve 5, an inner screw sleeve 6 and a copper ring gasket 7 to seal the connection part between the heat collecting pipe a and the header b, specifically the matching part between the heat collecting pipe of the heat collecting pipe and the heat collecting pipe connection hole of the header.

[0064] The inner circumference of the outer screw sleeve 5 is provided with an internal thread. The outer screw sleeve 5 is inserted into the heat collecting pipe connecting hole 4, and the outer circumference of the outer screw sleeve is sealed and welded with the hole wall of the heat collecting pipe connecting hole 4. The axial inner side end of the outer screw sleeve 5 is integrally provided with a circle of radially inwardly convex first annular inner flange 501.

[0065] The copper ring gasket 7 is sleeved outside the heat pipe 2, and the inner circumference of the copper ring gasket is sealed and welded with the outer circumference of the heat pipe 2. The heat pipe 2 passes through the outer screw sleeve 5, and the copper ring gasket 7 is located inside the outer screw sleeve 5.

[0066] The outer peripheral surface of the inner thread sleeve 6 has an external thread. The inner thread sleeve 6 is movably sleeved outside the heat pipe 2, and the inner thread sleeve and the outer thread sleeve 5 are threadedly matched and locked into the outer thread sleeve, so that the copper ring gasket 7 is axially sealed and clamped between the inner thread sleeve and the first annular inner flange 501.

[0067] As can be seen from the above, the copper ring gasket is sleeved on the outside of the heat pipe 2 and the two are sealed and welded, and the copper ring gasket is sealed and clamped between the inner screw sleeve 6 and the first annular inner flange 501 at the end of the outer screw sleeve, so that the water in the water cavity 3 cannot seep out.

[0068] In order to increase the sealing area between the copper ring gasket 7 and the inner and outer screw sleeves to improve the sealing effect, in this embodiment, a conical surface structure is provided on the axial outer end surface of the first annular inner flange 501 and the axial inner end surface of the inner screw sleeve 6. The conical surface on the first annular inner flange and the conical surface on the inner screw sleeve cooperate with each other to clamp the copper ring gasket 7 in the middle.

[0069] In order to more conveniently weld the outer screw sleeve 5 and the heat collecting tube connecting hole 4 and realize the sealing cooperation between the outer peripheral surface of the outer screw sleeve 5 and the wall surface of the heat collecting tube connecting hole 4, the present embodiment sets the above-mentioned heat collecting tube connecting hole 4 as a flanged hole with a flange, and the flange of the flanged hole is the flange 401 of the heat collecting tube connecting hole. After the outer screw sleeve 5 is installed into the heat collecting tube connecting hole 4, the laser welding process is used to weld and fix the flange of the heat collecting tube connecting hole 4 and the inner outer screw sleeve 5, so that the outer peripheral surface of the outer screw sleeve 5 and the wall surface of the heat collecting tube connecting hole 4 are fused and sealed to each other.

[0070] Similarly, in order to facilitate the welding of the copper ring gasket 7 and the heat pipe 2 and to achieve the sealing cooperation between the inner hole of the copper ring gasket 7 and the heat pipe 2, in this embodiment, the inner hole of the copper ring gasket 7 is also set as a flanged hole structure, and the flange of the flanged hole structure is the flange 701 of the copper ring gasket. After the copper ring gasket 7 is put on the required position on the heat pipe 2, the laser welding process is used to weld and fix the flange 701 of the copper ring gasket to the heat pipe 2, so that the inner circumference of the copper ring gasket 7 and the outer circumference of the heat pipe 2 are fused and sealed to each other.

[0071] The copper ring pad 7 is a copper ring pad with high thermal conductivity and easy to be welded with a copper heat pipe.

[0072] In this embodiment, the heat pipe extension end 201 is thicker than other pipe sections of the heat pipe. If the inner hole diameter of the first annular inner flange 501 is smaller than the diameter of the heat pipe extension end 201, then when assembling the solar collector, the thin end of the heat pipe 2 (the end away from the extension end of the heat collecting pipe) must first be passed through the outer screw sleeve 5, and then the outer screw sleeve 5 is welded to the heat collecting pipe connection hole 4, and then the vacuum pipe body 1 is mounted. In this way, not only is the assembly difficult, but once the outer screw sleeve 5 is welded, the heat pipe 2 in the heat collecting pipe cannot be removed from the header.

[0073] Based on the above reasons, in this embodiment, the inner hole diameter of the first annular inner flange 501 is set to be larger than the diameter of the heat pipe extension end 201. During assembly, the outer screw sleeve 5 is welded to the heat collecting pipe connection hole 4 first, and then the heat pipe 2 with the inner screw sleeve 6 is passed inward through the inner hole of the outer screw sleeve 5, so that the heat pipe extension end 201 extends into the water cavity 3 of the header. After that, the inner screw sleeve 6 is rotated, and the copper ring gasket 7 welded and fixed on the heat pipe 2 is sealed and clamped between the inner screw sleeve 6 and the first annular inner flange 501. Then the vacuum tube body 1 is sleeved on the outside of the heat pipe 2.

[0074] When the solar heat exchanger is actually used, the heat exchange tube a thereon is mostly placed at an angle, with the heat pipe protruding end 201 on top and the other end at the bottom. In this way, the heat pipe 2 has a tendency to slide downward under the action of its own gravity, which causes the copper ring gasket 7 to be stressed and acts on the inner screw sleeve 6 on the lower side of the copper ring gasket 7. If the supporting area of ​​the inner screw sleeve 6 for the copper ring gasket 7 is small, the copper ring gasket 7 is easily deformed or even damaged. Based on this, the present embodiment is provided with a circle of radially inwardly convex second annular inner flange 601 integrally at the axial inner side end of the inner screw sleeve 6. On the one hand, the supporting area of ​​the inner screw sleeve 6 for the copper ring gasket 7 is increased, and the possibility of the copper ring gasket 7 collapsing and deforming due to stress is reduced. On the other hand, the risk of external objects contacting and damaging the copper ring gasket 7 is also reduced.

[0075] Furthermore, in this embodiment, a circle of radially inwardly convex third annular inner flange 602 is integrally provided on the axial outer side of the inner screw sleeve 6, further reducing the risk of foreign objects contacting and damaging the copper ring gasket 7, while also limiting the swing space of the heat pipe 2.

[0076] Embodiment 2:

[0077] Figures 12 to 17 Another specific embodiment of the solar thermal collector of the present application is shown, which has a structure and assembly method substantially the same as the above-mentioned embodiment 1, except that:

[0078] In this embodiment, the axial outer end surface of the first annular inner flange 501 of the outer screw sleeve and the axial inner end surface of the inner screw sleeve 6 are both vertical planes and no longer have a conical surface structure. A rubber sealing ring 8 is axially sandwiched between the copper ring gasket 7 and the first annular inner flange 501.

Claims

1. A sealed connection structure of a heat collecting tube and a header of a solar collector, wherein the heat collecting tube (a) comprises a vacuum tube body (1) and a heat pipe (2) inserted into the vacuum tube body, a heat collecting tube connection hole (4) is formed on the wall of the header (b), and the heat pipe (2) comprises a heat pipe extension end (201) extending out of the vacuum tube body (1) and inserted into the heat collecting tube connection hole (4), It is characterized in that The heat collecting pipe connection hole (4) is in communication with the water cavity (3) inside the header (b), and the heat pipe extension end (201) extends into the water cavity (3); The sealing connection structure also includes: An external screw sleeve (5) with an internal thread on its inner circumference, the external screw sleeve being fixed in the heat collecting pipe connecting hole (4), and the outer circumference of the external screw sleeve being in sealing cooperation with the hole wall surface of the heat collecting pipe connecting hole (4), and the axial inner side end of the external screw sleeve being integrally provided with a circle of radially inwardly convex first annular inner flange (501); a copper ring gasket (7), the copper ring gasket being fixedly sleeved outside the heat pipe (2), and the inner peripheral surface of the copper ring gasket being in sealing cooperation with the outer peripheral surface of the heat pipe (2), the heat pipe (2) passing through the outer screw sleeve (5), and the copper ring gasket (7) being located inside the outer screw sleeve (5); and An inner screw sleeve (6) with an external thread on its outer circumferential surface is movably sleeved outside the heat pipe (2), and the inner screw sleeve is threadably matched with the outer screw sleeve (5) and locked into the outer screw sleeve, and the copper ring gasket (7) is axially sealed and clamped between the inner screw sleeve and the first annular inner flange (501).

2. The sealed connection structure of the heat collecting tube and the header of the solar collector according to claim 1, characterized in that: The axial outer end surface of the first annular inner flange (501) and the axial inner end surface of the inner threaded sleeve (6) include conical surfaces that cooperate with each other to clamp the copper ring gasket (7).

3. The sealed connection structure of the heat collecting tube and the header of the solar collector according to claim 1, characterized in that: The outer peripheral surface of the outer screw sleeve (5) is sealed and welded to the hole wall surface of the heat collecting pipe connecting hole (4).

4. The sealed connection structure of the heat collecting tube and the header of the solar collector according to claim 3, characterized in that: The heat collecting pipe connection hole (4) is a flanged hole, and the outer screw sleeve (5) is fixed to the flange of the flanged hole by welding.

5. The sealed connection structure of the heat collecting tube and the header of the solar collector according to claim 1, characterized in that: The inner circumference of the copper ring gasket (7) is sealed and welded to the outer circumference of the heat pipe (2).

6. The sealed connection structure of the heat collecting tube and the header of the solar collector according to claim 5, characterized in that: The inner hole of the copper ring gasket (7) is a flanged hole, and the heat pipe (2) is fixed to the flange of the flanged hole by welding.

7. The sealed connection structure of the heat collecting tube and the header of the solar collector according to claim 1, characterized in that: A rubber sealing ring (8) is axially sandwiched between the copper ring gasket (7) and the first annular inner flange (501).

8. The sealed connection structure of the heat collecting tube and the header of the solar collector according to claim 1, characterized in that: The inner hole diameter of the first annular inner flange (501) is larger than the diameter of the heat pipe extension end (201).

9. The sealed connection structure of the heat collecting tube and the header of the solar collector according to claim 1, characterized in that: The axial inner side end of the inner screw sleeve (6) is integrally provided with a circle of radially inwardly convex second annular inner flange (601).

10. A solar thermal collector, characterized in that: It comprises a sealing connection structure as described in any one of claims 1 to 9.

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