Special-shaped gravity assisted heat pipe and solar fan heater

Abstract

The utility model belongs to the technical field of heating equipment, and relates to a special-shaped gravity heat pipe and a solar fan heater, which comprise a first heat transfer part and a second heat transfer part, the first heat transfer part and the second heat transfer part are coaxially arranged, and the second heat transfer part is positioned on the outer side of the first heat transfer part; the plurality of second heat transfer parts are annularly distributed around the first heat transfer part; the first heat transfer part and the second heat transfer part are arranged on the special-shaped gravity heat pipe, so that the heat transfer area of the special-shaped gravity heat pipe is increased, and the heat transfer efficiency of the special-shaped gravity heat pipe is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heating equipment, in particular to a special-shaped gravity heat pipe and a solar heater. Background Art

[0002] Solar heater is an environmentally friendly heating device that converts solar energy into electrical energy through photovoltaic panels, which in turn drives the heating element to generate heat and achieve heating. However, solar energy is highly intermittent and unstable, so solar phase change energy storage technology came into being. When there is sufficient solar energy, the solar phase change heater stores excess heat in the phase change medium. When there is insufficient solar energy or at night, the phase change medium releases the previously stored heat to ensure continuous heating and improve heating efficiency.

[0003] Referring to the patent document with application number 202121520844.0, a solar phase change heater is disclosed, including a manifold, a heat collecting tube and a bracket, characterized in that it also includes a heat dissipation module, a sealing ring, a gravity heat pipe, a shaping tube, and a phase change medium. The phase change medium is filled in the shaping tube, the shaping tube is placed in the heat collecting tube, the sealing ring is installed at the opening of the heat collecting tube, the heat dissipation module is arranged in the condensation section of the gravity heat pipe, and the shaping tube is a metal round tube; sunlight shines on the heat collecting tube, and the heat collected by the heat collecting tube is transferred to the phase change medium through the shaping tube, the phase change medium absorbs and stores part of the heat, and the other part of the heat is transferred to the manifold through the heat pipe to heat the air in the manifold, and the circulating fan transports the heated air to the heat user terminal to achieve heating.

[0004] It can be seen that the phase change medium is filled in the cavity formed by the shaped tube and the gravity heat pipe. The gravity heat pipe is set as a round tube, which makes the contact area between the gravity heat pipe and the phase change medium small, affecting the heat exchange efficiency between the collector tube and the gravity heat pipe. Utility Model Content

[0005] In order to solve the technical problem in the background technology that the contact area between the gravity heat pipe and the phase change medium is small, which affects the heat exchange efficiency between the heat collecting pipe and the gravity heat pipe, the utility model provides a special-shaped gravity heat pipe and a solar heater.

[0006] The utility model discloses a special-shaped gravity heat pipe and a solar heater. By arranging a first heat transfer part and a second heat transfer part on the special-shaped gravity heat pipe, the heat transfer area of ​​the special-shaped gravity heat pipe is increased and the heat transfer efficiency of the special-shaped gravity heat pipe is improved.

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0008] A special-shaped gravity heat pipe comprises a first heat transfer part and a second heat transfer part, wherein the first heat transfer part and the second heat transfer part are coaxially arranged, and the second heat transfer part is located outside the first heat transfer part; a plurality of second heat transfer parts are arranged, and the plurality of second heat transfer parts are distributed in a ring shape around the first heat transfer part.

[0009] In a specific possible implementation manner, a connecting portion is further included, and the second heat transfer portion is connected with the first heat transfer portion through the connecting portion, and one second heat transfer portion corresponds to one connecting portion.

[0010] In a specific embodiment, the radial cross-section of the second heat transfer portion is fan-shaped.

[0011] A solar air heater comprises a heat collecting tube and a heat dissipation unit, and also comprises a special-shaped gravity heat pipe; the special-shaped gravity heat pipe comprises a condensing section, an insulating section and an evaporating section which are sequentially distributed from top to bottom, the evaporating section is coaxially sleeved in the heat collecting tube, and the condensing section extends into the heat dissipation unit; a first cavity is formed between the evaporating section and the heat collecting tube, a phase change medium is arranged in the first cavity, a heat transfer medium is arranged in the evaporating section, and the phase change medium in the first cavity absorbs and stores the heat energy of sunlight and transfers the heat energy to the heat transfer medium in the evaporating section.

[0012] In a specific possible implementation scheme, the heat dissipation unit includes a header, which is connected to one end of the heat collecting tube, and the side wall of the header is provided with an air inlet and an air outlet that are interconnected, a heat dissipation cavity is formed between the air inlet and the air outlet, and the condensing section extends into the heat dissipation cavity.

[0013] In a specific possible implementation scheme, the heat dissipation unit further includes a heat dissipation pipe; the heat dissipation pipe extends into the heat dissipation cavity, and one end of the heat dissipation pipe is connected to the heat collecting pipe, and the condensing section is coaxially nested in the heat dissipation pipe.

[0014] In a specific possible implementation manner, spiral fins are arranged around the outer circumference of the heat dissipation pipe.

[0015] In a specific embodiment, the spiral fin pitch is not less than 20 mm.

[0016] In a specific possible implementation scheme, the heat dissipation unit further includes a circulation fan, which is installed on the header and is used to increase the air flow rate in the heat dissipation cavity.

[0017] In a specific possible implementation manner, the circulation fan is installed at the air inlet.

[0018] In summary, the utility model includes the following beneficial technical effects:

[0019] 1. The utility model provides a special-shaped gravity heat pipe, by arranging a first heat transfer part and a second heat transfer part on the special-shaped gravity heat pipe, thereby increasing the heat transfer area of ​​the special-shaped gravity heat pipe and improving the heat transfer efficiency of the special-shaped gravity heat pipe.

[0020] 2. The utility model solar air heater increases the contact area between the special-shaped gravity heat pipe and the phase change medium by arranging the special-shaped gravity heat pipe on the solar air heater, improves the heat exchange efficiency between the collecting tube and the special-shaped gravity heat pipe, and at the same time, increases the heat dissipation area of ​​the evaporation section by arranging the special-shaped gravity heat pipe on the solar air heater, thereby improving the heating efficiency of the solar air heater.

[0021] 3. The utility model solar heater increases the heat dissipation area of ​​the condensing section by coaxially nesting the condensing section in the heat dissipation pipe, so that the heat of the condensing section is dissipated faster, and the heat dissipation efficiency of the special-shaped gravity heat pipe is improved. Preferably, spiral fins are arranged around the outer periphery of the heat dissipation pipe to improve the heat dissipation efficiency of the heat dissipation pipe and further improve the heating efficiency of the solar heater.

[0022] 4. The utility model solar air heater accelerates the air circulation in the header box by arranging a circulation fan on the header box, discharges the heated air in the header box from the air outlet more quickly, and improves the heating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the special-shaped gravity heat pipe of the utility model.

[0024] Figure 2 It is a schematic diagram of the overall structure of the utility model solar air heater.

[0025] Figure 3 The utility model is a partial structural schematic diagram of a solar air heater, which is intended to illustrate the positional relationship between the special-shaped gravity heat pipe and the heat collecting pipe.

[0026] Figure 4 It is a partial structural schematic diagram of the utility model solar air heater, and is intended to illustrate the heat dissipation unit.

[0027] Figure 5 It is a partial structural schematic diagram of the utility model solar air heater, which is intended to illustrate the positional relationship between the heat collecting pipe and the heat dissipating pipe.

[0028] Explanation of the reference numerals: 1. special-shaped gravity heat pipe; 11. first heat transfer part; 12. second heat transfer part; 13. connecting part; 2. heat collecting pipe; 3. heat dissipation unit; 31. header; 311. air inlet; 312. air outlet; 313. heat dissipation cavity; 32. heat dissipation pipe; 33. spiral fin; 34. circulation fan; 35. first cavity; 36. second cavity. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further explained below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the implementation methods described below.

[0030] Reference Figure 1 A special-shaped gravity heat pipe 1 comprises a first heat transfer part 11, a second heat transfer part 12 and a connecting part 13. The first heat transfer part 11 and the second heat transfer part 12 are coaxially arranged, and the second heat transfer part 12 is located outside the first heat transfer part 11. A plurality of second heat transfer parts 12 are provided, and the plurality of second heat transfer parts 12 are distributed in an annular shape around the first heat transfer part 11. The second heat transfer part 12 is connected to the first heat transfer part 11 through the connecting part 13, and one second heat transfer part 12 corresponds to one connecting part 13.

[0031] The second heat transfer part 12 can be provided in two, three or four forms, and the second heat transfer part 12 can be provided in a structure with a radial cross section of a sector, an ellipse, a circle, etc. In the present invention, any arrangement method that increases the heat transfer area of ​​the special-shaped gravity heat pipe 1 by providing the second heat transfer part 12 is acceptable.

[0032] Specifically, the special-shaped gravity heat pipe 1 includes a condensation section, an insulation section, and an evaporation section, which are sequentially distributed from top to bottom. When the heat transfer medium is heated in the evaporation section of the special-shaped gravity heat pipe 1, it evaporates and vaporizes, absorbing a large amount of latent heat of vaporization, and the steam flows rapidly to the condensation section under a small pressure difference; the steam condenses on the inner wall of the condensation section of the special-shaped gravity heat pipe 1, releasing a large amount of latent heat of vaporization; the liquid condensed in the condensation section flows back to the evaporation section along the wall of the special-shaped gravity heat pipe 1 under the action of gravity; in this way, the high-speed cycle continues, and the heat is continuously transferred from the evaporation section of the special-shaped gravity heat pipe 1 to the condensation section.

[0033] Reference Figure 2 and Figure 3 A solar air heater comprises a heat collecting tube 2, a heat dissipation unit 3, a special-shaped gravity heat pipe 1 and a bracket. The heat collecting tube 2 has a closed dome shape at one end and an open end at the other end. The closed end of the heat collecting tube 2 is fixed to a section of the bracket close to the ground, and the open end is fixed to a section of the bracket away from the ground. The heat collecting tube 2 is tilted to increase the area of ​​the heat collecting tube 2 in contact with sunlight and improve the heat collection efficiency of the heat collecting tube 2. The evaporation section is coaxially sleeved in the heat collecting tube 2, and the bottom of the evaporation section is welded to the closed end of the heat collecting tube 2 to ensure the position stability of the special-shaped gravity heat pipe 1. A first cavity 35 is formed between the evaporation section and the heat collecting tube 2. A phase change medium is arranged in the first cavity 35. A heat transfer medium is arranged in the evaporation section. The phase change medium in the first cavity 35 absorbs and stores the heat energy of sunlight and transfers the heat energy to the heat transfer medium in the evaporation section.

[0034] Specifically, the heat transfer medium is set to tetrafluoroethane. Tetrafluoroethane has a low boiling point and a high latent heat of vaporization. It can quickly change from liquid to gas in the evaporation section and from gas to liquid in the condensation section, thereby improving the heat transfer efficiency of the heat transfer medium in the special-shaped gravity heat pipe 1; tetrafluoroethane also has good fluidity, so that the heat transfer medium forms a stable flow cycle in the special-shaped gravity heat pipe 1, ensuring continuous and stable heat transfer.

[0035] Specifically, the phase change medium is set to Li2SO4, which is a solid-solid phase change medium. During the heating process, Li2SO4 changes from a low-energy state crystal structure to a high-energy state crystal structure and absorbs heat, realizing the heat storage of the phase change medium. During the cooling process, Li2SO4 changes from a high-energy state crystal structure to a low-energy state crystal structure and releases heat, realizing the heat release of the phase change medium. The transformation of the Li2SO4 crystal structure is achieved by rearranging the atoms or molecules in the Li2SO4 in the lattice, thereby absorbing or releasing heat. During the conversion process, there is no change in the overall phase of Li2SO4, and there is no solid-liquid or liquid-gas phase change in the traditional sense. It has the advantages of small volume change, no supercooling and leakage.

[0036] Reference Figure 2 and Figure 4 The heat dissipation unit 3 includes a header 31. The header 31 is connected to the open end of the heat collecting tube 2. The side wall of the header 31 is provided with an air inlet 311 and an air outlet 312 that are interconnected. The air inlet 311 and the air outlet 312 are arranged opposite to each other. A heat dissipation cavity 313 is formed between the air inlet 311 and the air outlet 312. The condensing section is inserted into the heat dissipation cavity 313. The insulation section is sealed and connected to the header 31 through a first seal. The first seal can be set as a rubber seal ring, a high-temperature sealant, etc. Preferably, the first seal is set as a rubber seal ring, and the shape of the rubber seal ring is set correspondingly according to the shape of the insulation section.

[0037] Example 1

[0038] This embodiment is a special-shaped gravity heat pipe, referring to Figure 1 In this embodiment, four second heat transfer parts 12 are provided, and the four second heat transfer parts 12 are evenly distributed in a ring shape around the first heat transfer part 11, thereby increasing the heat transfer area of ​​the special-shaped gravity heat pipe 1 and improving the heat transfer efficiency of the special-shaped gravity heat pipe 1.

[0039] Example 2

[0040] Reference Figure 1 On the basis of Example 1, the second heat transfer portion 12 is configured to have a fan-shaped radial cross section, which further increases the heat transfer area of ​​the special-shaped gravity heat pipe 1 and improves the heat transfer efficiency of the special-shaped gravity heat pipe 1.

[0041] Example 3

[0042] The present embodiment is a solar air heater. In the present embodiment, the first sealing member is configured as a rubber sealing ring, and the shape of the rubber sealing ring is configured accordingly according to the shape of the insulation section to avoid heat overflow from the condensation section and improve the heat transfer efficiency of the special-shaped gravity heat pipe 1.

[0043] Example 4

[0044] Reference Figure 2 , Figure 3 and Figure 5 In this embodiment, the heat dissipation unit 3 also includes a heat dissipation pipe 32, which extends into the heat dissipation cavity 313, and one end of the heat dissipation pipe 32 is connected to the open end of the heat collecting tube 2. The condensing section is coaxially nested in the heat dissipation pipe 32, and a second cavity 36 is formed between the condensing section and the heat dissipation pipe 32. There is no flow between the second cavity 36 and the first cavity 35, so as to prevent the heat released by the condensing section from being dissipated to the first cavity 35, thereby improving the heat transfer efficiency of the special-shaped gravity heat pipe 1.

[0045] Specifically, the heat dissipation pipe 32 is connected to the open end of the heat collecting pipe 2 through a second sealing member, which can be a rubber sealing ring, a high temperature sealant, a metal sealing ring, etc. In this embodiment, the second sealing member is a rubber sealing ring, and the shape of the rubber sealing ring is consistent with the cross-sectional shape of the second cavity 36.

[0046] Example 5

[0047] Reference Figure 2 On the basis of Example 4, spiral fins 33 are arranged around the outer periphery of the heat dissipation tube 32, and the spiral pitch of the spiral fins 33 is not less than 20 mm. Specifically, the spiral pitch of the spiral fins 33 can be set to 20 mm, 25 mm, 30 mm, etc., but any arrangement method that arranges the spiral fins 33 around the outer periphery of the heat dissipation tube 32 and increases the heat dissipation area of ​​the heat dissipation tube 32 is acceptable. In this embodiment, the spiral pitch of the spiral fins 33 is set to 20 mm, which increases the heat dissipation area of ​​the heat dissipation tube 32 and further improves the heat dissipation efficiency of the heat dissipation tube 32.

[0048] Example 6

[0049] Reference Figure 2 and Figure 4 On the basis of Embodiment 5, the heat dissipation unit 3 further includes a circulation fan 34. The circulation fan 34 is fixedly connected to the header 31, and the circulation fan 34 is communicated with the air outlet 312. Specifically, the circulation fan 34 is placed in the air inlet 311, and the circulation fan 34 is arranged opposite to the air outlet 312. The circulation fan 34 accelerates the air intake from the air inlet 311 and the air discharge from the air outlet 312, thereby increasing the air flow rate in the heat dissipation cavity 313 and optimizing the heating effect.

[0050] Example 7

[0051] Reference Figure 2 and Figure 4 On the basis of Embodiment 6, a plurality of circulating fans 34 are provided, and the plurality of circulating fans 34 are linearly distributed along the side wall of the header 31. The number of circulating fans 34 can be one, two, or three, and any arrangement method that increases the air flow rate in the heat dissipation cavity 313 by providing the circulating fans 34 is acceptable. In this embodiment, three circulating fans 34 are provided.

[0052] The implementation principle of the solar air heater of the utility model is as follows: during the day, sunlight shines on the outer wall of the heat collecting tube 2, and the phase change medium in the heat collecting tube 2 absorbs and stores the heat energy of the sunlight, and transfers the heat energy to the heat transfer medium in the evaporation section; the temperature of the heat transfer medium rises due to the heat, and then evaporates and vaporizes, and the steam flows from the evaporation section to the condensation section, condenses and releases heat after flowing to the condensation section, and the heat is dissipated into the second cavity 36; the heat in the second cavity 36 is dissipated into the heat dissipation cavity 313 through the heat dissipation pipe 32, thereby heating the air in the heat dissipation cavity 313; the circulation fan 34 rotates to discharge the heated air in the heat dissipation cavity 313 from the air outlet 312, thereby realizing heating.

[0053] At night, the phase change medium transfers the stored heat energy to the heat transfer medium in the evaporation section. The heat transfer medium is heated and its temperature rises, and then evaporates and vaporizes. The steam flows from the evaporation section to the condensation section, condenses and releases heat after flowing to the condensation section, and the heat is dissipated into the second cavity 36; the heat in the second cavity 36 is dissipated into the heat dissipation cavity 313 through the heat dissipation pipe 32, thereby heating the air in the heat dissipation cavity 313; the circulation fan 34 rotates to discharge the heated air in the heat dissipation cavity 313 from the air outlet 312, thereby achieving heating.

[0054] Repeat this process to achieve continuous heating.

[0055] The above are all preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A special-shaped gravity heat pipe, characterized in that: It comprises a first heat transfer part (11) and a second heat transfer part (12), wherein the first heat transfer part (11) and the second heat transfer part (12) are coaxially arranged, and the second heat transfer part (12) is located outside the first heat transfer part (11); A plurality of the second heat transfer parts (12) are provided, and the plurality of second heat transfer parts (12) are distributed in a ring shape around the first heat transfer part (11).

2. The special-shaped gravity heat pipe according to claim 1, characterized in that: It also includes a connecting portion (13), wherein the second heat transfer portion (12) is connected to the first heat transfer portion (11) via the connecting portion (13), and one second heat transfer portion (12) corresponds to one connecting portion (13).

3. The special-shaped gravity heat pipe according to claim 2, characterized in that: The radial cross section of the second heat transfer portion (12) is fan-shaped.

4. A solar air heater, comprising a heat collecting tube (2) and a heat dissipation unit (3), characterized in that: It also comprises the special-shaped gravity heat pipe (1) as claimed in any one of claims 1 to 3; The special-shaped gravity heat pipe (1) comprises a condensation section, an insulation section and an evaporation section which are sequentially arranged from top to bottom, the evaporation section is coaxially sleeved in the heat collecting pipe (2), and the condensation section extends into the heat dissipation unit (3); A first cavity (35) is formed between the evaporation section and the heat collecting tube (2), a phase change medium is arranged in the first cavity (35), a heat transfer medium is arranged in the evaporation section, and the phase change medium in the first cavity (35) absorbs and stores heat energy from sunlight and transfers the heat energy to the heat transfer medium in the evaporation section.

5. The solar air heater according to claim 4, characterized in that: The heat dissipation unit (3) comprises a header (31); The header (31) is connected to one end of the heat collecting tube (2); an air inlet (311) and an air outlet (312) that are interconnected are provided on a side wall of the header (31); a heat dissipation cavity (313) is formed between the air inlet (311) and the air outlet (312); and the condensing section extends into the heat dissipation cavity (313).

6. The solar air heater according to claim 5, characterized in that: The heat dissipation unit (3) further comprises a heat dissipation pipe (32); The heat dissipation pipe (32) extends into the heat dissipation cavity (313), and one end of the heat dissipation pipe (32) is connected to the heat collecting pipe (2), and the condensation section is coaxially nested in the heat dissipation pipe (32).

7. The solar air heater according to claim 6, characterized in that: The heat dissipation pipe (32) is surrounded by spiral fins (33).

8. The solar air heater according to claim 7, characterized in that: The spiral pitch of the spiral fins (33) is not less than 20 mm.

9. The solar air heater according to claim 5, characterized in that: The heat dissipation unit (3) further comprises a circulation fan (34), which is installed on the header (31) and is used to increase the air flow rate in the heat dissipation cavity (313).

10. The solar air heater according to claim 9, characterized in that: The circulation fan (34) is installed at the air inlet (311).

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