阅读说明：本技术 线聚焦金属流道太阳能真空集热管及制造工艺 (Line-focusing metal runner solar vacuum heat collecting tube and manufacturing process ) 是由 熊熙源 张化明 刘润泽 马晓莹 王德刚 于 2021-09-23 设计创作，主要内容包括：本申请涉及真空集热管的技术领域,尤其是涉及线聚焦金属流道太阳能真空集热管及制造工艺,其包括以下步骤：S1、制造玻璃外管；S2、铸造金属内管初加工件,冷轧加工；S3、铸造径向卸荷件初加工件,热轧、常温弯曲成型；S4、制作互相滑动配合的环形滑座和环形滑板；S5、组装内撑环；S6、将内密封环与金属内管熔接,将内密封环与玻璃外管熔接；S7、将连接部与金属内管进行焊接；S8、将径向卸荷件与环形滑座胶接,将径向卸荷件与玻璃外管胶接；S9、将玻璃外管与金属内管之间的腔室抽为真空；本申请在金属内管发生膨胀变形的前提下,能够提高金属内管与玻璃外管的连接气密性和稳定性,改善真空集热管的使用性能,延长真空集热管的寿命。(The application relates to the technical field of vacuum heat collecting tubes, in particular to a line-focusing metal runner solar vacuum heat collecting tube and a manufacturing process, which comprises the following steps: s1, manufacturing a glass outer tube; s2, casting a metal inner tube primary machined part, and cold rolling; s3, casting a radial unloading piece primary workpiece, hot rolling, and bending and forming at normal temperature; s4, manufacturing an annular sliding seat and an annular sliding plate which are in sliding fit with each other; s5, assembling an inner supporting ring; s6, welding the inner sealing ring with the metal inner pipe, and welding the inner sealing ring with the glass outer pipe; s7, welding the connecting part with the metal inner pipe; s8, gluing the radial unloading piece with the annular sliding seat and gluing the radial unloading piece with the outer glass tube; s9, vacuumizing a cavity between the glass outer tube and the metal inner tube; this application takes place under the prerequisite of expansion deformation at the metal inner tube, can improve the connection gas tightness and the stability of metal inner tube and glass outer tube, improves evacuated collector tube's performance, prolongs evacuated collector tube's life-span.)

1. The utility model provides a line focus metal runner solar vacuum heat collection tube, includes metal inner tube (1) and glass outer tube (2), inside metal inner tube (1) was located glass outer tube (2), its characterized in that: an axial unloading piece (3) and a radial unloading piece (6) are connected between the metal inner tube (1) and the glass outer tube (2) at the same time; the axial unloading part (3) comprises an annular sliding seat (31) and an annular sliding plate (32), the annular sliding seat (31) is provided with a sliding groove (311), the annular sliding plate (32) is inserted into the sliding groove (311) and is in sliding connection with the annular sliding seat (31), a connecting part (321) is fixedly arranged at the end part, far away from the annular sliding seat (31), of the annular sliding plate (32), the inner wall of the connecting part (321) is fixedly connected with the outer peripheral wall of the metal inner tube (1), the annular sliding plate (32) and the annular sliding seat (31) are jointly connected with an elastic main sealing piece (4), and the connecting part (321) and the annular sliding seat (31) are jointly connected with an elastic auxiliary sealing piece (5); the inner circumferential surface of the radial unloading piece (6) is fixedly connected with the annular sliding seat (31), and the outer circumferential surface of the radial unloading piece (6) is fixedly connected with the inner wall of the glass outer tube (2); the cavities of the metal inner tube (1) and the glass outer tube (2) are set to be vacuum.

2. The line focus metal flow channel solar vacuum heat collection tube of claim 1, wherein: the end part of the annular sliding plate (32) located in the sliding groove (311) is fixedly provided with an anti-falling ring (322), the inner wall of the sliding groove (311) is provided with an anti-falling groove (312), and the anti-falling ring (322) is located in the anti-falling groove (312) and is in sliding connection with the annular sliding seat (31).

3. The line focus metal flow channel solar vacuum heat collection tube of claim 1, wherein: in the diameter direction of the metal inner pipe (1), the radial unloading piece (6) is bent to and fro to form a wave shape.

4. The line focus metal flow channel solar vacuum thermal-collecting tube of claim 3, characterized in that: in the radial direction of the metal inner pipe (1), the included angle of the bending geometric center lines of any two adjacent sections of the radial unloading piece (6) is 20-35 degrees.

5. The line focus metal flow channel solar vacuum thermal-collecting tube of claim 3, characterized in that: and reinforced connecting rings (61) are fixedly arranged at the joints of the radial unloading piece (6) and the metal inner tube (1) and the joints of the radial unloading piece (6) and the glass outer tube (2).

6. The line focus metal flow channel solar vacuum heat collection tube of claim 1, wherein: the radial unloading piece (6) is arranged in a hollow mode.

7. The line focus metal flow channel solar vacuum heat collection tube of claim 1, wherein: an inner sealing ring (7) is connected between the metal inner tube (1) and the glass outer tube (2) together, and the inner sealing ring (7) is closer to the middle part of the metal inner tube (1) than the radial unloading piece (6) and the axial unloading piece (3).

8. The line focus metal flow channel solar vacuum heat collection tube of claim 1, wherein: the metal inner tube (1) cover is equipped with interior supporting ring (8), and the internal perisporium of interior supporting ring (8) is closely butt with metal inner tube (1), and the periphery wall that metal inner tube (1) was kept away from in interior supporting ring (8) is closely butt with the inner wall of glass inner tube.

9. A manufacturing process of a line focusing metal runner solar vacuum heat collecting tube, the line focusing metal runner solar vacuum heat collecting tube according to any one of the claims 1 to 8, characterized in that: the method comprises the following steps:

s1, manufacturing the glass outer tube (2): manufacturing a glass outer tube (2) with openings at two ends by adopting a hot stamping forming method;

s2, manufacturing the metal inner tube (1): casting a primary workpiece of the metal inner tube (1), and performing cold rolling on the primary workpiece of the metal inner tube (1);

s3, manufacturing a radial unloading piece (6): casting a radial unloading piece (6) primary processing piece, and carrying out hot rolling and normal-temperature bending forming on the radial unloading piece (6) primary processing piece;

s4, manufacturing an annular sliding seat (31) and an annular sliding plate (32) which are matched with each other in a sliding way;

s5, mounting of the inner support ring (8): placing the metal inner tube (1) inside the glass outer tube (2), sleeving the metal inner tube (1) into a plurality of inner support rings (8), and enabling the intervals of the inner support rings (8) to be equal, so that the inner support rings (8) are simultaneously abutted against the metal inner tube (1) and the glass outer tube (2);

s6, installation of the inner sealing ring (7): the inner peripheral wall of the inner sealing ring (7) is welded with the metal inner pipe (1), and the outer peripheral wall of the inner sealing ring (7) is welded with the glass outer pipe (2);

s7, installation of the annular sliding base (31) and the annular sliding plate (32): welding the inner peripheral wall of the connecting part (321) with the outer peripheral wall of the metal inner pipe (1);

s8, connection of the radial unloading piece (6): the inner peripheral wall of the radial unloading piece (6) is glued with the annular sliding seat (31), and the outer peripheral wall of the radial unloading piece (6) is glued with the inner wall of the glass outer tube (2);

s9, vacuumizing: the cavity between the glass outer tube (2) and the metal inner tube (1) is vacuumized through an air outlet tube, and an air exhaust tube (21) is sealed.

Technical Field

The application relates to the technical field of vacuum heat collecting tubes, in particular to a line-focusing metal runner solar vacuum heat collecting tube and a manufacturing process thereof.

Background

Heating by using solar energy is an advanced technology which is more and more widely applied in recent years, for example, solar water heaters are commonly used in places such as families, dormitories, hotels and the like. The structures of various solar water heaters are different, but the key technology is that the heat collecting device fully absorbs the energy of sunlight and converts the energy into heat energy to heat a water source for use.

The evacuated collector tube is a core collector assembly commonly used on a solar water heater, and comprises a glass outer tube and a metal inner tube, wherein vacuum is formed between the glass outer tube and the metal inner tube, the tube wall of the metal inner tube is coated with a heat absorbing material, water flows through the metal inner tube, the water is heated by solar radiation energy absorbed by the glass outer tube and the metal inner tube, a vacuum layer plays a role in heat preservation, and the evacuated collector tube is connected with a water storage tank in a plug-in mode.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: the metal inner tube is easy to expand and deform after being heated, so that the joint of the metal inner tube and the glass outer tube is loosened and leaks, or the metal inner tube is deformed under pressure when the pressure is higher, so that the phenomena can be caused, and the service performance and the service life of the vacuum heat collecting tube are influenced.

Disclosure of Invention

Under the prerequisite that takes place the expansion deformation at the metal inner tube, in order to improve the connection gas tightness and the stability of metal inner tube and glass outer tube, improve evacuated collector tube's performance, the life-span of extension evacuated collector tube, this application provides line focus metal runner solar vacuum collector tube and manufacturing process.

The line focusing metal runner solar vacuum heat collecting tube adopts the following technical scheme:

a line focusing metal runner solar vacuum heat collecting tube comprises a metal inner tube and a glass outer tube, wherein the metal inner tube is positioned in the glass outer tube, and an axial unloading part and a radial unloading part are simultaneously connected between the metal inner tube and the glass outer tube; the axial unloading piece comprises an annular sliding seat and an annular sliding plate, the annular sliding seat is provided with a sliding chute, the annular sliding plate is inserted into the sliding chute and is in sliding connection with the annular sliding seat, a connecting part is fixedly arranged at the end part of the annular sliding plate, which is far away from the annular sliding seat, the inner wall of the connecting part is fixedly connected with the outer peripheral wall of the metal inner tube, the annular sliding plate and the annular sliding seat are jointly connected with an elastic main sealing sheet, and the connecting part and the annular sliding seat are jointly connected with an elastic auxiliary sealing sheet; the inner peripheral surface of the radial unloading piece is fixedly connected with the annular sliding seat, and the outer peripheral surface of the radial unloading piece is fixedly connected with the inner wall of the glass outer tube; the cavities of the metal inner tube and the glass outer tube are set to be vacuum.

By adopting the technical scheme, the metal inner tube and the glass outer tube are fixedly connected by the axial unloading piece and the radial unloading piece together, and the annular sliding seat is connected with the annular sliding plate in a sealing manner by the elastic main sealing piece and the elastic auxiliary sealing piece. When the metal inner tube warp, the metal inner tube can drive annular slide through connecting portion and remove, and annular slide carries out the relative movement of small displacement with annular slide, and elasticity main seal piece, elasticity vice gasket produce small deformation, still keep the sealing connection of annular slide and annular slide. The radial unloading piece can deform along the diameter direction of the metal inner tube, and the deformation of the metal inner tube in the diameter direction can be compensated and absorbed by the radial unloading piece. The sliding connection of annular slide and annular slide can realize keeping the sealing connection of metal inner tube and glass outer tube throughout under the flexible circumstances of warping of metal inner tube, can improve the connection gas tightness and the stability of metal inner tube and glass outer tube, improves evacuated collector tube's performance, prolongs evacuated collector tube's life-span.

Optionally, an anti-drop ring is fixedly arranged at the end part of the annular sliding plate located in the sliding groove, an anti-drop groove is formed in the inner wall of the sliding groove, and the anti-drop ring is located in the anti-drop groove and is in sliding connection with the annular sliding seat.

By adopting the technical scheme, the slip connection of the anti-drop ring and the annular sliding seat can avoid the annular sliding plate from dropping off the annular sliding seat, and the use safety of the line focusing metal runner solar vacuum heat collecting tube is improved.

Optionally, in the diameter direction of the metal inner tube, the radial unloading piece is bent back and forth to form a wave shape.

By adopting the technical scheme, the deformation capacity of the radial unloading piece in the diameter direction of the radial unloading piece can be increased, the elastic deformation performance of the radial unloading piece in the diameter direction is improved, and the radial unloading piece can effectively absorb the telescopic deformation of the metal inner tube.

Optionally, in the radial direction of the metal inner pipe, the included angle between the bending geometric center lines of any two adjacent sections of the radial unloading piece is 20-35 °.

By adopting the technical scheme, when the bending angle of the radial unloading piece exceeds 180 degrees, the mechanical strength of the bending part of the radial unloading piece is weakest; in the radial direction of the metal inner tube, the included angle of the bending geometric center lines of any two adjacent sections of the radial unloading piece is 20-35 degrees, so that the radial unloading piece has good scalability and structural strength, and the possibility of cracking at the bending part of the radial unloading piece is reduced.

Optionally, reinforced connecting rings are fixedly arranged at the joints of the radial unloading piece and the metal inner tube and the joints of the radial unloading piece and the glass outer tube.

By adopting the technical scheme, the connection area of the radial unloading piece and the annular sliding seat can be increased by reinforcing the connection ring, and the connection firmness of the radial unloading piece and the annular sliding seat is improved; the reinforced connecting ring can increase the connecting area of the radial unloading piece and the glass outer tube, and improve the connecting firmness of the radial unloading piece and the glass outer tube.

Optionally, the radial unloading piece is arranged in a hollow manner.

By adopting the technical scheme, the radial unloading part is hollow, so that the weight of the radial unloading part can be reduced, the manufacturing cost is reduced, and the bending deformation performance of the radial unloading part can be improved.

Optionally, an inner sealing ring is connected between the metal inner tube and the glass outer tube, and the inner sealing ring is closer to the middle of the metal inner tube than the radial unloading member and the axial unloading member.

Through adopting above-mentioned technical scheme, the vacuum degree of cavity between metal inner tube and the glass outer tube can further be kept to interior sealing ring, and when the connection leakproofness of annular slide and annular slide reduced, interior sealing ring can play a role as secondary insurance.

Optionally, the metal inner tube sleeve is provided with an inner supporting ring, the inner peripheral wall of the inner supporting ring is tightly abutted to the metal inner tube, and the outer peripheral wall of the inner supporting ring away from the metal inner tube is tightly abutted to the inner wall of the glass inner tube.

Through adopting above-mentioned technical scheme, interior vaulting ring can further improve the connection wholeness and the connection stability of metal inner tube and glass outer tube, and simultaneously, interior vaulting ring can absorb the stress that the deformation on the part metal inner tube diameter direction produced, keeps the appearance uniformity of metal inner tube.

Optionally, a manufacturing process of a line focus metal flow passage solar vacuum heat collecting tube, the line focus metal flow passage solar vacuum heat collecting tube according to any one of the above claims 1 to 8, comprising the following steps:

s1, manufacturing a glass outer tube: manufacturing a glass outer tube with openings at two ends by adopting a hot stamping forming method;

s2, manufacturing a metal inner tube: casting a metal inner tube primary machined part, and performing cold rolling processing on the metal inner tube primary machined part;

s3, manufacturing a radial unloading piece: casting a radial unloading piece primary processing piece, and carrying out hot rolling and normal-temperature bending forming on the radial unloading piece primary processing piece;

s4, manufacturing an annular sliding seat and an annular sliding plate which are mutually matched in a sliding way;

s5, mounting of the inner supporting ring: placing the metal inner tube inside the glass outer tube, sleeving the metal inner tube into the plurality of inner support rings, and enabling the distances between the inner support rings to be equal, so that the inner support rings simultaneously abut against the metal inner tube and the glass outer tube;

s6, mounting of the inner sealing ring: the inner peripheral wall of the inner sealing ring is welded with the metal inner pipe, and the outer peripheral wall of the inner sealing ring is welded with the glass outer pipe;

s7, mounting of the annular sliding seat and the annular sliding plate: welding the inner peripheral wall of the connecting part with the outer peripheral wall of the metal inner pipe;

s8, connection of a radial unloading piece: the inner peripheral wall of the radial unloading piece is connected with the annular sliding seat in an adhesive mode, and the outer peripheral wall of the radial unloading piece is connected with the inner wall of the glass outer tube in an adhesive mode.

By adopting the technical scheme and the line focusing metal runner solar vacuum heat collecting tube manufactured by the manufacturing process, when the metal inner tube deforms, the metal inner tube can drive the annular sliding plate to move through the connecting part, the annular sliding plate and the annular sliding seat move relatively in a small displacement mode, the elastic main sealing piece and the elastic auxiliary sealing piece deform slightly, and the annular sliding seat and the annular sliding plate are still kept in sealing connection. The radial unloading piece can deform along the diameter direction of the metal inner tube, and the deformation of the metal inner tube in the diameter direction can be compensated and absorbed by the radial unloading piece. The sliding connection of annular slide and annular slide can realize keeping the sealing connection of metal inner tube and glass outer tube throughout under the flexible circumstances of warping of metal inner tube, can improve the connection gas tightness and the stability of metal inner tube and glass outer tube, improves evacuated collector tube's performance, prolongs evacuated collector tube's life-span.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the metal inner pipe deforms, the metal inner pipe can drive the annular sliding plate to move through the connecting part, the annular sliding plate and the annular sliding seat perform relative movement of small displacement, the elastic main sealing sheet and the elastic auxiliary sealing sheet generate small deformation, and the annular sliding seat and the annular sliding plate are still kept in sealing connection; the radial unloading piece can deform along the diameter direction of the metal inner tube, and the deformation of the metal inner tube in the diameter direction can be compensated and absorbed by the radial unloading piece. The radial unloading piece and the axial unloading piece can jointly realize that the metal inner tube and the glass outer tube are always in sealed connection under the condition that the metal inner tube is in telescopic deformation, so that the connection air tightness and stability of the metal inner tube and the glass outer tube can be improved, the service performance of the vacuum heat collecting tube is improved, and the service life of the vacuum heat collecting tube is prolonged;

2. the inner sealing ring can further keep the vacuum degree of a cavity between the metal inner tube and the glass outer tube, and when the connection sealing performance of the annular sliding seat and the annular sliding plate is reduced, the inner sealing ring can play a role as a secondary safety;

3. the inner supporting ring can further improve the connection integrity and the connection stability of the metal inner tube and the glass outer tube, and meanwhile, the inner supporting ring can absorb stress generated by deformation of part of the metal inner tube in the diameter direction, so that the appearance consistency of the metal inner tube is kept.

Drawings

FIG. 1 is a schematic structural diagram of a line-focus metal runner solar vacuum heat collecting tube and a manufacturing process according to an embodiment of the present application;

fig. 2 is an enlarged view of a portion a in fig. 1.

Description of reference numerals: 1. a metal inner tube; 2. a glass outer tube; 21. an air exhaust pipe; 211. sealing the cover; 3. an axial relief; 31. an annular slide seat; 311. a chute; 312. a drop-proof groove; 32. an annular slide plate; 321. a connecting portion; 322. the anti-drop ring; 4. an elastic main sealing sheet; 5. an elastic pair sealing sheet; 6. a radial relief; 61. reinforcing the connecting ring; 7. an inner seal ring; 8. an inner support ring.

Detailed Description

The present application is described in further detail below with reference to figures 1-2.

The embodiment of the application discloses a line focusing metal runner solar vacuum heat collecting tube.

Referring to fig. 1, the line-focusing metal runner solar vacuum heat collecting tube comprises a metal inner tube 1 and a glass outer tube 2, wherein the metal inner tube 1 is positioned inside the glass outer tube 2, the axes of the metal inner tube and the glass outer tube are overlapped, and the length of the metal inner tube 1 is greater than that of the glass outer tube 2. An axial unloading member 3 and a radial unloading member 6 are simultaneously connected between the metal inner tube 1 and the glass outer tube 2, two groups of the axial unloading members 3 and the radial unloading members 6 are respectively positioned at two end parts of the metal inner tube 1 or the glass outer tube 2, and the two groups of the axial unloading members 3 and the radial unloading members 6 seal a cavity between the metal inner tube 1 and the glass outer tube 2; two ends of the axial unloading piece 3 are respectively connected with the metal inner tube 1 and the radial unloading piece 6, the end part of the radial unloading piece 6 far away from the axial unloading piece 3 is connected with the glass outer tube 2, and the cavities of the metal inner tube 1 and the glass outer tube 2 are set to be vacuum.

Referring to fig. 1, two inner sealing rings 7 are connected between a metal inner tube 1 and a glass outer tube 2 together, the inner sealing rings 7 are close to an axial unloading piece 3 or a radial unloading piece 6, the inner sealing rings 7 are closer to the middle part of the metal inner tube 1 than the radial unloading piece 6 and the axial unloading piece 3, and the inner sealing rings 7 are parallel to the diameter of the metal inner tube 1; the inner peripheral wall of the inner sealing ring 7 is welded with the metal inner tube 1, and the outer peripheral wall of the inner sealing ring 7 is welded with the glass outer tube 2.

Referring to fig. 1, a plurality of inner support rings 8 are sleeved on a metal inner tube 1, in this embodiment, four inner support rings 8 are provided, the distance between two adjacent inner support rings 8 is equal, and the inner support rings 8 are parallel to the diameter of the metal inner tube 1; the internal perisporium of interior braced ring 8 and the inseparable butt of metal inner tube 1, the outer peripheral wall that interior braced ring 8 kept away from metal inner tube 1 and the inseparable butt of inner wall of glass inner tube.

Referring to fig. 1, the glass outer tube 2 is communicated with an exhaust tube 21, the exhaust tube 21 is located between the inner sealing ring 7 and the inner supporting ring 8, and an opening of the exhaust tube 21 is sealed with a sealing cover 211.

The radial unloading part 6 and the axial unloading part 3 can jointly realize that the metal inner tube 1 and the glass outer tube 2 are always kept in sealing connection under the condition that the metal inner tube 1 is in telescopic deformation, so that the connection airtightness and stability of the metal inner tube 1 and the glass outer tube 2 can be improved, the service performance of the vacuum heat collecting tube is improved, and the service life of the vacuum heat collecting tube is prolonged. The inner seal ring 7 can further maintain the vacuum degree of the cavity between the metal inner tube 1 and the glass outer tube 2, and when the connection sealing performance between the annular slide seat 31 and the annular slide plate 32 is reduced, the inner seal ring 7 can function as a secondary safety device. The inner support ring 8 can further improve the connection integrity and the connection stability of the metal inner tube 1 and the glass outer tube 2, and meanwhile, the inner support ring 8 can absorb the stress generated by the deformation of part of the metal inner tube 1 in the diameter direction, so that the appearance consistency of the metal inner tube 1 is kept.

Referring to fig. 1 and 2, the axial unloading member 3 includes an annular slider 31 and an annular slide plate 32. The annular slide 31 has seted up spout 311 towards the side in metal inner tube 1 middle part, and anticreep groove 312 has all been seted up to spout 311 two inner walls just right each other, and annular slide 32 inserts in the spout 311 and with annular slide 31 sliding fit, and the tip integrated into one piece that annular slide 32 is located spout 311 has anticreep ring 322, and anticreep ring 322 is located anticreep groove 312 and with annular slide 31 sliding connection. A connecting part 321 is integrally formed at the end part of the annular sliding plate 32 far away from the annular sliding seat 31, the inner wall of the connecting part 321 is fixedly connected with the outer peripheral wall of the metal inner tube 1, the annular sliding plate 32 and the annular sliding seat 31 are fixedly connected with an elastic main sealing piece 4, and the connecting part 321 and the annular sliding seat 31 are fixedly connected with an elastic auxiliary sealing piece 5; the inner peripheral wall of the radial unloading piece 6 is fixedly connected with the annular sliding seat 31, and the outer peripheral wall of the radial unloading piece 6 is fixedly connected with the inner wall of the glass outer tube 2.

The metal inner tube 1 and the glass outer tube 2 are fixedly connected by the axial unloading piece 3 and the radial unloading piece 6 together, and the annular sliding seat 31 and the annular sliding plate 32 are connected in a sealing manner by the elastic main sealing piece 4 and the elastic auxiliary sealing piece 5. When the metal inner tube 1 deforms, the metal inner tube 1 can drive the annular sliding plate 32 to move through the connecting portion 321, the annular sliding plate 32 and the annular sliding seat 31 perform relative movement with small displacement, the elastic main sealing piece 4 and the elastic auxiliary sealing piece 5 generate small deformation, and the sealing connection between the annular sliding seat 31 and the annular sliding plate 32 is still maintained. The slip connection of the anti-slip ring 322 and the annular sliding seat 31 can prevent the annular sliding plate 32 from slipping off the annular sliding seat 31, and improve the use safety of the line focusing metal runner solar vacuum heat collecting tube.

Referring to fig. 1 and 2, in the diameter direction of the metal inner tube 1, the radial unloading member 6 is bent back and forth to form a wave shape, so that the deformation capacity of the radial unloading member 6 in the diameter direction is increased, the elastic deformation performance of the radial unloading member in the diameter direction is improved, and the radial unloading member 6 can effectively absorb the telescopic deformation of the metal inner tube 1. The radial unloading part 6 is hollow, so that the weight of the radial unloading part 6 can be reduced, the manufacturing cost is reduced, and the bending deformation performance of the radial unloading part 6 can be improved.

Referring to fig. 1 and 2, in the diameter direction of the metal inner tube 1, the included angle between the bending geometric center lines of any two adjacent sections of the radial unloading piece 6 is 15-40 degrees, and when the bending angle of the radial unloading piece 6 exceeds 180 degrees, the mechanical strength of the bending part of the radial unloading piece 6 is weakest; in the radial direction of the metal inner tube 1, the included angle of the bending geometric center lines of any two adjacent sections of the radial unloading piece 6 is 15-40 degrees, so that the radial unloading piece 6 has good scalability and structural strength, and the possibility of cracking at the bending part of the radial unloading piece 6 is reduced.

Referring to fig. 1 and 2, annular reinforcing connecting rings 61 are fixedly connected to the joints of the radial unloading member 6 and the metal inner tube 1 and the joints of the radial unloading member 6 and the glass outer tube 2. The reinforced connecting ring 61 can increase the connecting area of the radial unloading piece 6 and the annular sliding seat 31, and improve the connecting firmness of the radial unloading piece 6 and the annular sliding seat 31; the reinforced connecting ring 61 can increase the connecting area of the radial unloading piece 6 and the glass outer tube 2, and improve the connecting firmness of the radial unloading piece 6 and the glass outer tube 2.

The implementation principle of the line focusing metal runner solar vacuum heat collecting tube in the embodiment of the application is as follows: the metal inner tube 1 and the glass outer tube 2 are fixedly connected by the axial unloading piece 3 and the radial unloading piece 6 together, and the annular sliding seat 31 and the annular sliding plate 32 are connected in a sealing manner by the elastic main sealing piece 4 and the elastic auxiliary sealing piece 5.

When the metal inner tube 1 deforms, the metal inner tube 1 can drive the annular sliding plate 32 to move through the connecting part 321, the annular sliding plate 32 and the annular sliding seat 31 perform relative movement of small displacement, the elastic main sealing piece 4 and the elastic auxiliary sealing piece 5 generate small deformation, and the sealing connection between the annular sliding seat 31 and the annular sliding plate 32 is still maintained; the radial unloading piece 6 can effectively absorb the telescopic deformation of the metal inner pipe 1.

The inner seal ring 7 can further maintain the vacuum degree of the cavity between the metal inner tube 1 and the glass outer tube 2, and when the connection sealing performance between the annular slide seat 31 and the annular slide plate 32 is reduced, the inner seal ring 7 can function as a secondary safety device.

The inner support ring 8 can further improve the connection integrity and the connection stability of the metal inner tube 1 and the glass outer tube 2, and meanwhile, the inner support ring 8 can absorb the stress generated by the deformation of part of the metal inner tube 1 in the diameter direction, so that the appearance consistency of the metal inner tube 1 is kept.

The embodiment of the application also discloses a manufacturing process of the line focusing metal runner solar vacuum heat collecting tube, which comprises the following steps:

s1, referring to the figure, the glass outer tube 2 with openings at both ends is manufactured by a hot press molding method, and then crack detection is performed, and the glass outer tube is qualified without cracks.

And S2, referring to the figure, manufacturing the primary workpiece of the metal inner tube 1 by adopting a casting process, performing cold rolling on the primary workpiece of the metal inner tube 1, and performing sizing test and crack-free detection after the cold rolling is completed. (ii) a

And S3, referring to the figure, casting the radial unloading part 6 initially-processed piece, carrying out hot rolling on the radial unloading part 6 initially-processed piece, improving the plasticity of the radial unloading part 6 initially-processed piece, and bending and molding the radial unloading part 6 initially-processed piece by using a press at normal temperature to form the wavy radial unloading part 6.

S4, referring to the figure, the annular slide 31 and the annular slide 32 are cast to be slidably fitted to each other.

S5, referring to the figure, the metal inner tube 1 is arranged inside the glass outer tube 2, the metal inner tube 1 is sleeved into the inner support rings 8, the distance between the adjacent inner support rings 8 is equal, the inner support rings 8 are perpendicular to the axis of the metal inner tube 1, and the inner support rings 8 are tightly pressed against the metal inner tube 1 and the glass outer tube 2 at the same time.

S6, referring to the figure, the inner seal ring 7 is put in place, the inner peripheral wall of the inner seal ring 7 is heated and then welded to the outer peripheral wall of the metal inner tube 1, and the outer peripheral wall of the inner seal ring 7 is heated and then welded to the inner peripheral wall of the glass outer tube 2.

S7, referring to the figure, the inner peripheral wall of the connecting portion 321 and the outer peripheral wall of the metal inner pipe 1 are welded and connected integrally.

S8, referring to the figure, the inner peripheral wall of the radial unloading part 6 is glued with the annular slide seat 31 by using strong glue, and the outer peripheral wall of the radial unloading part 6 is glued with the inner wall of the glass outer tube 2 by using strong glue;

s9, referring to the figure, the chamber between the glass outer tube 2 and the metal inner tube 1 is evacuated through the air outlet tube, and the exhaust tube 21 is sealed by the cover 211.

The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.