A LED car lamp with multiple heat dissipation

Abstract

The present invention discloses a LED automobile lamp with multiple heat dissipation, including a chuck, a heat dissipation fan and an LED lamp board. A heat dissipation seat is provided through the middle of the chuck, one end of the heat dissipation seat is connected to the LED lamp board, lamp beads are provided on both sides of the LED lamp board, the heat dissipation fan is arranged on one side of the chuck and opposite to the heat dissipation seat, a heat dissipation pipe with built-in coolant is provided through the chuck, and both ends of the heat dissipation pipe are fixedly connected with an annular heat exchange pipe with a gap sleeved outside the LED lamp board, and a straight pipe part, a spiral part and a drainage part are provided on the heat dissipation pipe, and the coolant in the heat dissipation pipe flows through the straight pipe part, the spiral part, the drainage part and the annular heat exchange pipe. In the present invention, by providing the straight pipe part, the spiral part, the drainage part, the heat dissipation fan, the annular heat exchange pipe, the wind wheel and the spiral blades, the present invention has multiple heat dissipation effects of air cooling and water cooling, better heat dissipation effect, small size, low cost, and more reliable and safe heat dissipation.

Description

Technical Field

[0001] The invention relates to the technical field of automobile lamp manufacturing, and in particular to a LED automobile lamp with multiple heat dissipation. Background Art

[0002] LED lights are widely used in the field of automotive lighting manufacturing due to their high brightness and strong controllability. Since LED lights have high brightness and generate a lot of heat, heat dissipation treatment is usually required during the use of automotive lights in order to increase the service life of LED lights.

[0003] At present, the utility model with the publication number CN208139184U proposes a multi-heat dissipation LED car lamp, including a lamp pole, a lamp board, a holder and a heat dissipation assembly. A long lamp board groove is provided at one end of the lamp pole, and the lamp board is fixed by rivets; a fixed heat dissipation tube is provided in the middle of the lamp pole, and a protrusion is provided at one end of the heat dissipation tube close to the lamp board; the other end of the lamp pole is built in the heat dissipation assembly, and the heat dissipation assembly includes a radiator, a fan and a bottom cover. The fan is inserted into the mounting groove of the radiator by bolts to lock the fan into the radiator, and the bottom cover is threadedly connected to the radiator. The utility model adopts a combination of multiple heat dissipation and heat conduction technologies to improve the life of the LED car lamp. The heat of the LED car lamp is quickly taken away through the structure of active heat dissipation and passive heat dissipation, while reducing the volume of the tail, making the installation easier and more applicable.

[0004] However, the above-mentioned prior art still has shortcomings when used: its multiple heat dissipation methods are passive heat dissipation and active heat dissipation, among which passive heat dissipation is to use a fin structure heat sink for natural heat dissipation, and active heat dissipation is to use a cooling fan to blow away the heat on the heat sink. However, this conventional heat dissipation combination method is difficult to meet the needs of LED headlights with higher heat generation. In other words, the existing automotive LED lights generate higher heat, and the existing heat dissipation structure is difficult to quickly discharge the heat, resulting in a greatly reduced service life of the headlights.

[0005] To this end, the present invention proposes a multi-heat dissipation LED automobile lamp. Summary of the invention

[0006] The purpose of the present invention is to solve the problem of insufficient heat dissipation of the heat dissipation structure of the existing LED automobile lamp and to propose a LED automobile lamp with multiple heat dissipation.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A multiple heat dissipation LED automobile lamp comprises a chuck, a heat dissipation fan and an LED lamp board, a heat dissipation seat is provided through the middle of the chuck, one end of the heat dissipation seat is connected to the LED lamp board, lamp beads are provided on both sides of the LED lamp board, the heat dissipation fan is arranged on one side of the chuck and opposite to the heat dissipation seat, a heat dissipation pipe with built-in coolant is provided through the chuck, both ends of the heat dissipation pipe are fixedly connected with an annular heat exchange pipe which is sleeved outside the LED lamp board with a gap, a straight pipe portion, a spiral portion and a drainage portion are provided on the heat dissipation pipe, the coolant in the heat dissipation pipe flows through the straight pipe portion, the spiral portion, the drainage portion and the annular heat exchange pipe, the straight pipe portion is opposite to the back side of the heat dissipation fan, both ends of the straight pipe portion are connected to the drainage portion, the drainage portion is used to drain the coolant flow, and the spiral portion is sleeved on the outside of the straight pipe portion.

[0009] As a further description of the above technical solution:

[0010] The drainage part includes a gear housing, gear one and gear two. A transmission chamber one rotatably connected to gear one and a transmission chamber two rotatably connected to gear two are provided in the gear housing. Gear one and gear two are meshed. Connecting pipes connected in series with the heat dissipation pipe are fixedly connected on both sides of the gear housing. The connecting pipes are communicated with the junction of the transmission chamber one and the transmission chamber two.

[0011] As a further description of the above technical solution:

[0012] Gears 1 located at both ends of the straight tube portion are coaxially arranged, and a transmission shaft 1 is fixedly connected to the middle part of gear 1 close to the cooling fan, and the transmission shaft 1 passes through the middle part of gear 1 away from the cooling fan and is rotatably connected, and a transmission shaft 2 rotatably connected to an adjacent gear housing is fixedly connected to the middle part of gear 2 that meshes with gear 1 rotatably matched with the transmission shaft 1, and one end of the transmission shaft 2 and the transmission shaft 1 are connected by a belt drive group located on the outside of the adjacent gear housings of the two.

[0013] As a further description of the above technical solution:

[0014] The shell of the heat dissipation fan is fixedly connected to the heat dissipation pipe, and one end of the wheel shaft of the impeller on the heat dissipation fan is fixedly connected to one end of the transmission shaft.

[0015] As a further description of the above technical solution:

[0016] The transmission shaft 1 is coaxial with the straight tube portion, the transmission shaft 1 passes through the straight tube portion and a spiral blade located in the straight tube portion is welded to the outer peripheral wall of the transmission shaft 1.

[0017] As a further description of the above technical solution:

[0018] The middle part of gear 2 near the cooling fan is also fixedly connected to transmission shaft 2 which is rotatably connected to the adjacent gear housing. The opposite ends of transmission shaft 2 near the two ends of the straight tube are fixedly connected to wind wheels, which are located outside the gear housing and close to the spiral part.

[0019] As a further description of the above technical solution:

[0020] The two sections of the heat dissipation pipe located on one side of the chuck and connected to the annular heat exchange pipe are spiral-shaped, and a spiral heat conducting sheet with a closed-loop structure is fixedly connected to the pipe body of the annular heat exchange pipe.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0022] 1. In the present invention, an annular heat exchange tube is sleeved on the outside of the LED lamp panel, and then a heat dissipation tube is arranged across the chuck. Both ends of the heat dissipation tube are connected to the annular heat exchange tube, and a coolant is arranged in a closed-loop passage formed by the heat dissipation tube and the annular heat exchange tube. When the coolant flows, water cooling is achieved, and air cooling is combined with the heat dissipation fan and the heat dissipation seat. At the same time, the flow airflow generated by the heat dissipation fan will accelerate the heat dissipation of the heat dissipation tube. This air cooling and water cooling combined heat dissipation method produces multiple heat dissipation effects, and the heat dissipation effect is better, which greatly extends the service life of the vehicle lamp.

[0023] 2. In the present invention, two drainage parts using the gear pump principle are arranged on the heat dissipation pipe. The two drainage parts can drive the coolant to flow quickly without a matching turnover water tank. Moreover, the two drainage parts are connected in series to the heat dissipation pipe and are driven by the axle of a heat dissipation fan at the same time, which has the advantages of low cost, small size and no space occupation.

[0024] 3. In the present invention, wind wheels are arranged on the two drainage parts, and the wind wheels on the two drainage parts are arranged relatively. When the drainage parts are running, the wind wheels will rotate, and the rotation of the wind wheels will drive the air to flow outside the spiral part of the heat dissipation pipe. Since the heat dissipation area of ​​the spiral part is larger, combined with the blowing effect of the two wind wheels, the coolant passing through the spiral part can be quickly cooled down, which can effectively avoid the problem of leakage caused by poor pipeline sealing due to high pressure formed by excessive coolant temperature. This is suitable for occasions where the car lights are turned on for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of a multi-heat dissipation LED automotive lamp proposed by the present invention;

[0026] Figure 2 for Figure 1 The main view;

[0027] Figure 3 This is a schematic diagram of the structure of a drainage part of a LED automobile lamp with multiple heat dissipation proposed by the present invention;

[0028] Figure 4 for Figure 3 A schematic diagram of a drainage part on the middle straight pipe part away from the cooling fan after explosion and expansion;

[0029] Figure 5 This is a schematic diagram of the structure of a transmission system of a multiple heat dissipation LED automobile lamp proposed by the present invention;

[0030] Figure 6 for Figure 3 Schematic diagram of the right view.

[0031] Legend:

[0032] 1. Chuck; 2. Cooling fan; 21. Impeller; 3. LED light board; 31. Lamp beads; 4. Heat sink; 5. Heat pipe; 51. Straight pipe; 52. Spiral part; 53. Drainage part; 531. Gear housing; 5311. Transmission chamber 1; 5312. Transmission chamber 2; 5313. Connecting pipe; 532. Gear 1; 5321. Drive shaft 1; 53211. Spiral blade; 533. Gear 2; 5331. Drive shaft 2; 6. Annular heat exchange tube; 61. Spiral heat conductive sheet; 7. Belt drive group; 8. Wind wheel. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example 1

[0035] See also Figure 1-5 A multi-heat dissipation LED automobile lamp includes a chuck 1, a heat dissipation fan 2 and an LED light board 3. The chuck 1 is a component that is connected to the rear of the lampshade. A heat sink 4 is provided through the middle of the chuck 1. One end of the heat sink 4 is connected to the LED light board 3. Lamp beads 31 are provided on both sides of the LED light board 3. The heat of the lamp beads 31 and the LED light board 3 will be transferred to the heat sink 4, and the heat sink 4 will discharge the heat outward. The heat dissipation fan 2 is provided on one side of the chuck 1 and is opposite to the heat sink 4, that is, the heat dissipation fan 2 is located outside the rear of the lampshade. The heat dissipation fan 2 blows air to the heat sink 4 to accelerate heat exchange and realize air-cooled heat dissipation. The heat sink 4 adopts a common aluminum heat dissipation structure including fins. Specifically, the heat sink 4 can be a cylindrical structure. A row of scattered fins is provided in the cylinder. The fins are opposite to the heat dissipation fan 2. A slot fixedly connected to the LED light board 3 is provided at the blind end outside the cylinder.

[0036] In the present technical solution, a heat dissipation tube 5 with built-in coolant is provided on the chuck 1, two through holes can be provided on the disk surface of the chuck 1, two places of the heat dissipation tube 5 pass through the through holes, and then the heat dissipation tube 5 and the chuck 1 are welded at the through holes, and the two ends of the heat dissipation tube 5 are fixedly connected with an annular heat exchange tube 6 which is sleeved outside the LED lamp board 3, that is, a part of the heat dissipation tube 5 is located on one side of the chuck 1, and the other part is located on the other side of the chuck 1, and the annular heat exchange tube 6 and the heat dissipation tube 5 are in a connected state, and the function of the annular heat exchange tube 6 is to absorb the heat generated by the lamp bead 31, wherein the heat dissipation tube 5 and the annular heat exchange tube 6 are both made of aluminum, and if the coolant flows along the closed-loop channel formed by the annular heat exchange tube 6 and the heat dissipation tube 5, a water cooling effect can be generated, thereby improving the heat dissipation effect, wherein the coolant can be automobile coolant (water and ethylene glycol mixture). How to improve the air-cooled heat dissipation effect and drive the coolant flow is a problem that needs to be solved.

[0037] To this end, a straight tube portion 51, a spiral portion 52 and a drainage portion 53 are provided on the heat dissipation tube 5. The straight tube portion 51, the spiral portion 52 and the drainage portion 53 are all located outside the chuck 1. The outside here refers to the side located outside the lampshade after the automobile lamp is installed. The coolant in the heat dissipation tube 5 flows through the straight tube portion 51, the spiral portion 52, the drainage portion 53 and the annular heat exchange tube 6. When the coolant flows through the annular heat exchange tube 6, heat exchange is performed. The function of the spiral portion 52 is to increase the heat dissipation area. When the high-temperature coolant flows through the straight tube portion 51 and the spiral portion 52, natural heat dissipation is performed. Among them, the spiral portion 52 is sleeved on the outside of the straight tube portion 51. The straight tube portion 51 and the back of the heat dissipation fan 2 are opposite. The suction force generated by the heat dissipation fan 2 will accelerate the airflow to flow through the spiral portion 52 and the straight tube portion 51, accelerate the cooling of the coolant, and thus improve the air-cooled heat dissipation effect. Then, drainage parts 53 are connected to both ends of the straight tube part 51. Specifically, one heat dissipation tube 5 includes two drainage parts 53, and the drainage parts 53 are used to guide the flow of the coolant. The two drainage parts 53 can increase the driving force for the flow of the coolant.

[0038] The specific structure of the drainage part 53 is that it includes a gear housing 531, a gear 1 532 and a gear 2 533. The gear housing 531 is provided with a transmission chamber 1 5311 rotatably connected to the gear 1 532 and a transmission chamber 2 5312 rotatably connected to the gear 2 533. The gear 1 532 and the gear 2 533 are meshed. The two sides of the gear housing 531 are fixedly connected with connecting pipes 5313 connected in series with the heat dissipation pipe 5. The connecting pipes 5313 are connected to the junction of the transmission chamber 1 5311 and the transmission chamber 2 5312, that is, one connecting pipe 5313 is a water inlet pipe, and the other connecting pipe 5313 is a drain pipe. The drainage part 53 draws on the structural principle of the gear pump to drive the liquid flow. When the gear 1 532 and the gear 2 533 are running, one connecting pipe 5313 will attract the coolant, and the other connecting pipe 5313 will push the sucked coolant outward through the other connecting pipe 5313.

[0039] Furthermore, the gears 1 532 at both ends of the straight tube 51 are coaxially arranged, and the middle of the gear 1 532 near the cooling fan 2 is fixedly connected with a transmission shaft 1 5321, which penetrates the middle of the gear 1 532 far from the cooling fan 2 and is rotatably connected, wherein the transmission shaft 1 5321 can be rotatably connected with the gear housing 531 through a small-sized bearing. The middle of the gear 2 533 meshing with the gear 1 532 rotatably matched with the transmission shaft 1 5321 is fixedly connected with a transmission shaft 2 5331 rotatably connected with the adjacent gear housing 531, and the transmission shaft 2 5331 is also rotatably connected with the gear housing 531 through a small-sized bearing, and the transmission shaft 2 5331 and one end of the transmission shaft 1 5321 are connected through a belt drive group 7 located outside the adjacent gear housings 531 of the two, and the belt drive group 7 here adopts a common transmission structure of a pulley and a belt combination, and the purpose of this arrangement is to ensure that the directions of the coolant flow pushed by the two drainage parts 53 are in a consistent state. Thus, when the single transmission shaft 5321 is controlled to rotate, the two drainage parts 53 will operate simultaneously to generate driving force. The advantage of this arrangement is that the volume is reduced, and the coolant can circulate in the closed-loop pipeline without the need for a matching turnover water tank.

[0040] In this embodiment, the shell of the cooling fan 2 is fixedly connected to the cooling pipe 5. Specifically, a positioning sleeve is welded on the outer peripheral wall of the shell through two connecting plates. The positioning sleeve is fixedly mounted on the cooling pipe 5. One end of the axle of the impeller 21 on the cooling fan 2 is fixedly connected to one end of the transmission shaft 5321. The cooling fan 2 provides a driving force for the rotation of the transmission shaft 5321. When in use, the power of the cooling fan 2 can be appropriately increased so that the coolant can flow reliably without affecting the normal heat dissipation of the cooling fan 2.

[0041] Furthermore, in order to reduce the resistance of the coolant flow, the transmission shaft 5321 and the straight tube 51 are coaxially arranged, the transmission shaft 5321 passes through the straight tube 51 and the outer peripheral wall thereof is welded with a spiral blade 53211 located in the straight tube 51, the transmission shaft 5321 and the straight tube 51 are rotatably connected, and a bearing can be installed at the rotatable connection. The function of the spiral blade 53211 is to reverse flow and accelerate the flow of the coolant. Since the rotation resistance of the spiral blade 53211 is small, the axial driving force of the coolant generated by it will reduce the load of the operation of the drainage part 53. Thus, it has the advantage of energy saving.

[0042] In this embodiment, the two sections of the heat dissipation tube 5 located on one side of the chuck 1 and connected to the annular heat exchange tube 6 are spirally shaped. This arrangement facilitates the coolant to flow through the annular heat exchange tube 6 in an all-round manner. A spiral heat conductive plate 61 with a closed-loop structure is fixedly connected to the tube body of the annular heat exchange tube 6. The spiral heat conductive plate 61 can further increase the area of ​​heat exchange with the lamp bead 31.

[0043] Example 2

[0044] See also Figure 6 , which is different from Example 1, is that the middle part of the gear 2 533 near the cooling fan 2 is also fixedly connected to a transmission shaft 2 5331 rotatably connected to the adjacent gear housing 531, and the opposite ends of the transmission shaft 2 5331 near the two ends of the straight tube portion 51 are fixedly connected to wind wheels 8, which are located outside the gear housing 531 and close to the spiral portion 52. The two wind wheels 8 will blow air in opposite directions to accelerate the heat dissipation of the spiral portion 52, so that the coolant passing through the spiral portion 52 can be quickly cooled down to avoid the formation of high air pressure in the heat dissipation pipe 5. Therefore, this arrangement can not only further improve the heat dissipation effect, but also effectively prevent the coolant temperature from being too high, resulting in an increase in pressure in the heat dissipation pipe 5, thereby avoiding the problem of coolant leakage from the rotating seal, which is suitable for the working scenario where the LED car lights are turned on for a long time.

[0045] In the above-mentioned embodiment 1 and embodiment 2, the parts involved in sealing are sealed by using a common sealing rubber ring structure. Since the sealing method is common and is a prior art, the sealing structure of the rotating connection in this technology is not described in detail in this application.

[0046] Working principle: 1. Before use, use the chuck 1 to fasten and install the car lamp through the pressure strip located on the lamp shell. At this time, the LED lamp board 3 and the annular heat exchange tube 6 are located in the lampshade, and then the wires on the heat sink 4 (not shown in the figure) are connected to the power supply line. At this time, the assembly of the car lamp and the lampshade is completed.

[0047] 2. When in use, the lamp bead 31 is powered on, lights up and generates heat. Part of the heat is transferred to the annular heat exchange tube 6, and part of the heat is transferred to the heat sink 4. The heat dissipation fan 2 is powered on and started at the same time, and the external airflow blows to the heat sink 4 to accelerate the heat dissipation of the heat sink 4. In this process, the impeller 21 on the heat dissipation fan 2 will drive the transmission shaft 1 5321 to rotate. At this time, the gear 1 532 in the drainage part 53 close to the heat dissipation fan 2 will rotate. When the gear 1 532 rotates, the adjacent gear 2 533 will be driven to rotate due to the meshing action. The coolant in the current gear housing 531 will flow, and the drainage part 53 away from the heat dissipation fan 2 is driven by the reversing transmission action of the belt drive group 7, so that the direction of the coolant flow is consistent with the direction of the coolant flow in the aforementioned drainage part 53, thereby accelerating the flow of the coolant. After passing through the spiral part 52, the coolant accelerates the heat dissipation, and the cooled coolant enters the annular heat exchange tube 6 and the heat exchange in the lampshade, and then the next cooling cycle is carried out. The rotation of the wind wheel 8 accelerates the external airflow to flow through the spiral part 52, accelerates the heat dissipation of the spiral part 52, and makes the coolant flowing through it in a state of rapid cooling. Therefore, the above-mentioned air cooling and water cooling methods, combined with the heat exchange characteristics of the annular heat exchange tube 6 on the periphery of the LED lamp board 3, make the vehicle lamp have multiple heat dissipation functions and better heat dissipation effect.

[0048] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-heat dissipation LED automobile lamp, comprising a chuck (1), a heat dissipation fan (2) and an LED lamp board (3), characterized in that: A heat sink (4) is provided through the middle of the chuck (1), one end of the heat sink (4) is connected to the LED light board (3), lamp beads (31) are provided on both sides of the LED light board (3), the heat dissipation fan (2) is provided on one side of the chuck (1) and opposite to the heat sink (4), a heat dissipation pipe (5) with built-in coolant is provided through the chuck (1), both ends of the heat dissipation pipe (5) are fixedly connected to an annular heat exchange pipe (6) which is sleeved on the outside of the LED light board (3), and the heat dissipation fan (2) is provided on one side of the chuck (1) and opposite to the heat dissipation pipe (4), The heat dissipation pipe (5) is provided with a straight pipe portion (51), a spiral portion (52) and a drainage portion (53); the coolant in the heat dissipation pipe (5) flows through the straight pipe portion (51), the spiral portion (52), the drainage portion (53) and the annular heat exchange pipe (6); the straight pipe portion (51) and the back surface of the heat dissipation fan (2) are opposite to each other; the drainage portions (53) are connected to both ends of the straight pipe portion (51); the drainage portions (53) are used to guide the coolant to flow; and the spiral portion (52) is sleeved on the outside of the straight pipe portion (51); The drainage portion (53) comprises a gear housing (531), a gear 1 (532) and a gear 2 (533); a transmission chamber 1 (5311) rotatably connected to the gear 1 (532) and a transmission chamber 2 (5312) rotatably connected to the gear 2 (533) are arranged in the gear housing (531); the gear 1 (532) and the gear 2 (533) are meshed; connecting pipes (5313) connected in series with the heat dissipation pipe (5) are fixedly connected to both sides of the gear housing (531); the connecting pipes (5313) are in communication with the junction of the transmission chamber 1 (5311) and the transmission chamber 2 (5312); The gears 1 (532) located at both ends of the straight tube portion (51) are coaxially arranged, and a transmission shaft 1 (5321) is fixedly connected to the middle of the gear 1 (532) close to the heat dissipation fan (2). The transmission shaft 1 (5321) passes through the middle of the gear 1 (532) away from the heat dissipation fan (2) and is rotatably connected. The middle of the gear 2 (533) meshing with the gear 1 (532) rotatably matched with the transmission shaft 1 (5321) is fixedly connected to a transmission shaft 2 (5331) rotatably connected to the adjacent gear housing (531). One end of the transmission shaft 2 (5331) and the transmission shaft 1 (5321) are connected via a belt drive group (7) located outside the adjacent gear housings (531) of the two.

2. The LED automotive lamp with multiple heat dissipation according to claim 1, characterized in that: The outer shell of the heat dissipation fan (2) and the heat dissipation pipe (5) are fixedly connected, and one end of the wheel shaft of the impeller (21) on the heat dissipation fan (2) is fixedly connected to one end of the transmission shaft 1 (5321).

3. The LED automotive lamp with multiple heat dissipation according to claim 1, characterized in that: The transmission shaft 1 (5321) and the straight tube portion (51) are coaxial, the transmission shaft 1 (5321) passes through the straight tube portion (51) and a spiral blade (53211) located inside the straight tube portion (51) is welded to its outer peripheral wall.

4. The LED automotive lamp with multiple heat dissipation according to claim 1, characterized in that: The middle portion of the second gear (533) near the cooling fan (2) is also fixedly connected to a second transmission shaft (5331) rotatably connected to the adjacent gear housing (531), and the opposite ends of the second transmission shaft (5331) near the two ends of the straight tube portion (51) are fixedly connected to wind wheels (8), and the wind wheels (8) are located outside the gear housing (531) and near the spiral portion (52).

5. The LED automotive lamp with multiple heat dissipation according to claim 1, characterized in that: The two sections of the heat dissipation pipe (5) located on one side of the chuck (1) and connected to the annular heat exchange pipe (6) are spiral-shaped, and a spiral heat conducting sheet (61) with a closed-loop structure is fixedly connected to the pipe body of the annular heat exchange pipe (6).

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