Heat pipe heat exchanger

Abstract

The present application relates to heat pipe heat exchange technical field, especially for heat pipe heat exchange device, including shell, sealing plate and several condensing pipes, the sealing plate is through and is set up with several first through hole, the shell cooperation sealing plate forms the evaporation cavity for containing liquid state working medium, heating element is arranged in the inside of evaporation cavity, and heating element is submerged in the inside of liquid state working medium, the bottom end of condensing pipe is communicated with evaporation cavity through first through hole;The inner top of evaporation cavity is provided with flat plate, and second through hole and third through hole are set up on the flat plate, wherein, the second through hole and first through hole are one-to-one corresponding arrangement, the second through hole and third through hole are interval arrangement;The bottom of each second through hole is correspondingly provided with first memory metal sheet, and the first memory metal sheet includes installation part and inclined part connected by bending part.The present application makes every condensing pipe can work normally, improves the heat exchange efficiency of whole heat exchange device.

Description

Technical Field

[0001] This invention relates to the field of heat pipe heat exchange technology, specifically to a heat pipe heat exchange device. Background Technology

[0002] In the field of heat dissipation for heat-generating devices such as electronic equipment and power modules, heat pipe heat exchange systems are widely used due to their advantages such as high heat exchange efficiency, compact structure, and no additional power drive. A typical heat pipe heat exchange system usually includes an evaporation chamber, a heating element, and several condenser tubes. The heating element is located inside the evaporation chamber, and the condenser tubes are connected to the evaporation chamber and extend to the outside of the evaporation chamber. The evaporation chamber is filled with a liquid working fluid. During operation, the heat generated by the heating element is transferred to the liquid working fluid inside the evaporation chamber, causing the liquid working fluid to vaporize and form a gaseous working fluid. The gaseous working fluid enters the condenser tubes and exchanges heat with the outside environment, condenses to form a liquid working fluid, and flows back to the evaporation chamber along the inner wall of the condenser tubes, completing the working fluid cycle and achieving heat dissipation and cooling of the heating element.

[0003] For example, Chinese invention patent application CN120385245A discloses a heat pipe heat exchange device. Although this device solves the problem of working fluid leakage and loss when the heat pipe heat exchanger is depressurized through the pressure relief valve, the following problems still exist in actual use:

[0004] Specifically, in practical applications, the defects are more pronounced, especially during the initial startup of the heating element and when a large amount of heat is generated instantaneously. Specifically, because the liquid working fluid surrounding the heating element preferentially vaporizes upon heating, the gaseous working fluid concentrates directly above the heating element, resulting in uneven heat distribution within the evaporation chamber. The temperature near the heating element is significantly higher than at the far end, causing the gaseous working fluid to preferentially enter the adjacent condenser tubes. This leads to overload of the near-end condenser tubes and idleness of the far-end condenser tubes, with only some condenser tubes operating normally. This significantly reduces the overall heat exchange efficiency of the system, failing to meet the high-efficiency heat exchange requirements of the heating element. In severe cases, localized overheating can damage the heating element and the heat exchange system, limiting its application in high heat flux density scenarios. Summary of the Invention

[0005] The purpose of this invention is to provide a heat pipe heat exchange device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A heat pipe heat exchange device includes a shell, a sealing plate, and several condenser tubes. Several first through holes are provided through the sealing plate. The shell and the sealing plate form an evaporation chamber for containing a liquid working fluid. A heating element is disposed inside the evaporation chamber and is submerged in the liquid working fluid. The bottom end of the condenser tubes is connected to the evaporation chamber through the first through holes.

[0008] The top of the evaporation chamber is provided with a flat plate, and a second through hole and a third through hole are provided on the flat plate. The second through hole is provided in a one-to-one correspondence with the first through hole, and the second through hole and the third through hole are provided at intervals.

[0009] Each of the second through holes is provided with a first memory metal sheet at its bottom. The first memory metal sheet includes a mounting part and an inclined part connected by a bending part. The mounting part is fixedly connected to the lower surface of the plate, and the inclined part is inclinedly disposed below the second through hole.

[0010] The interior of the two third through holes near both ends of the plate is provided with a vertically elastic support structure that expands and contracts with heat. The top of the elastic support structure is fixedly connected to the sealing plate, and the bottom of the elastic support structure is fixedly connected to the plate.

[0011] When the elastic support structure is in a contracted state, the top surface of the plate rests against the lower surface of the sealing plate; when the elastic support structure is in an extended state, a gap is formed between the top surface of the plate and the lower surface of the sealing plate.

[0012] Preferably, the elastic support structure includes a second shape memory metal sheet in a wave shape, the top end of the second shape memory metal sheet is fixedly connected to the sealing plate, and the bottom end of the second shape memory metal sheet is fixedly connected to the plate through a connecting rod.

[0013] Preferably, a connecting seat is fixedly connected to the bottom end of the second memory metal sheet, the connecting seat being an inverted isosceles triangle, and the connecting rod is fixedly connected to the connecting seat.

[0014] Preferably, a fixing seat is fixedly connected to the top of the second memory metal sheet, and the fixing seat is fixedly installed on the bottom of the plate.

[0015] Preferably, each of the four corner positions of the plate is fixedly provided with a replacement block, and when the elastic support structure is in an extended state, at least part of the replacement block is located below the liquid surface of the liquid working fluid.

[0016] Preferably, the replacement block includes a corrosion-resistant shell and a sealing cavity disposed inside the corrosion-resistant shell, the sealing cavity being filled with a weight-adding body.

[0017] Preferably, a feeding pipe is fixedly connected to the side of the corrosion-resistant shell, and a sealing plug is sealed at the port of the feeding pipe.

[0018] Preferably, the filler block is fixedly connected to the plate via a connecting piece, and the upper surface of the connecting piece is flush with the upper surface of the plate.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] In this invention, the angle between the inclined portion and the plate is at its maximum when the heating element is not working. Then, when the heating element starts generating heat, the liquid working fluid transforms into a gaseous state under the heat of the heating element and accumulates above the heating element. At this time, the gaseous working fluid passes through the space between the inclined portion and the plate, as well as the second and first through holes, into the interior of the condenser tube. It then exchanges heat with the external environment through the condenser tube. During this process, the temperature of the gaseous working fluid causes the inclination angle of the inclined portion to gradually decrease, making it more difficult for the gaseous working fluid to enter the adjacent condenser tube, thus forcing it to enter a condenser tube further away. Subsequently... As the gaseous working fluid enters the condenser tube at a greater distance, the angle of the inclined section corresponding to that condenser tube decreases. Simultaneously, the elastic support structure elongates under the temperature effect of the gaseous working fluid, causing the flat plate to move downwards and separate from the sealing plate to form a gap. The gaseous working fluid enters the condenser tube through the third through hole and the gap, preventing excessive pressure of the gaseous working fluid inside the evaporation chamber. This solves the technical problems of overload of the near-end condenser tube, idleness of the far-end condenser tube, and only partial condensation function in existing heat pipe heat exchangers. It ensures that each condenser tube can function normally, improving the heat exchange efficiency of the entire heat exchanger and preventing local overheating from damaging the heating elements and the heat exchanger.

[0021] This invention, by setting up a filler block, can raise the liquid level of the remaining liquid working medium inside the evaporation chamber after a large amount of liquid working medium is converted into gaseous working medium, or when the gaseous working medium condenses into liquid and cannot fall back into the evaporation chamber in time. This ensures that the heating position of the heating element can be completely covered by the liquid working medium. This design can also ensure the heat dissipation effect of the heating element while reducing the amount of liquid working medium used, and at the same time reduce the volume of the entire heat exchange device to a certain extent. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a cross-sectional three-dimensional structural diagram of the present invention;

[0024] Figure 3 This is a cross-sectional three-dimensional structural diagram of the outer shell and sealing plate of the present invention;

[0025] Figure 4 For the present invention Figure 3 A front view structural diagram;

[0026] Figure 5 For the present invention Figure 4 A partial structural diagram;

[0027] Figure 6This is a partial structural schematic diagram of the front cross-section of the flat plate of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the flat plate and the filler block of the present invention;

[0029] Figure 8 This is a schematic diagram of the elastic support structure of the present invention;

[0030] Figure 9 This is a cross-sectional three-dimensional structural diagram of the interpolation block of the present invention.

[0031] In the diagram: 1. Outer shell; 101. Evaporation chamber; 2. Sealing plate; 201. First through hole; 3. Condenser tube; 4. Flat plate; 401. Second through hole; 402. Third through hole; 5. First shape memory metal sheet; 501. Bending part; 502. Mounting part; 503. Inclined part; 6. Second shape memory metal sheet; 7. Fixing base; 8. Connecting base; 9. Connecting rod; 10. Filler block; 1001. Corrosion-resistant shell; 1002. Sealing chamber; 1003. Weighting body; 1004. Feeding pipe; 1005. Sealing plug; 11. Connecting piece; 12. Heating element. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figures 1-9 The present invention provides a technical solution:

[0034] The heat pipe heat exchange device includes an outer shell 1, a sealing plate 2, and several condenser tubes 3, wherein the condenser tubes 3 are the heat pipes, and their function is to exchange heat. The outer shell 1 and the sealing plate 2 can both be made of corrosion-resistant materials, such as corrosion-resistant stainless steel.

[0035] A plurality of first through holes 201 are provided on the sealing plate 2. The outer shell 1 and the sealing plate 2 form an evaporation chamber 101 for containing liquid working fluid. The bottom end of the condenser tube 3 is connected to the evaporation chamber 101 through the first through holes 201.

[0036] The heating element 12 is disposed inside the evaporation chamber 101 and is submerged in the liquid working medium. In this embodiment, the heating element 12 can be a component such as a battery that generates heat when it is working.

[0037] The basic working principle of the above scheme is as follows: When the heating element 12 is working, it will generate heat, which will cause the liquid working medium to evaporate and form a gaseous working medium. The gaseous working medium will enter the interior of the condenser tube 3 through the first through hole 201 due to factors such as pressure. The condenser tube 3, together with the fins, will exchange heat between the gaseous working medium and the external environment. When the temperature of the gaseous working medium drops to a predetermined value, the gaseous working medium will re-condense into a liquid and then slide down the condenser tube 3 and finally fall back into the interior of the evaporation chamber 101.

[0038] However, in actual operation, it was found that the heat distribution inside the evaporation chamber 101 was uneven, or rather, the distribution of the gaseous working fluid was uneven. Specifically, the temperature near the heating element 12 was significantly higher than the temperature farthest from the heating element 12. This is because the liquid working fluid surrounding the heating element 12 is preferentially heated, and the resulting gaseous working fluid is located directly above the heating element 12. At this time, the gaseous working fluid preferentially enters the interior of the adjacent condenser tube 3, causing the condenser tube 3 closer to the heating element 12 to be prone to overload, while the condenser tube 3 farther from the heating element 12 is prone to not working, that is, only some of the condenser tubes 3 are in working condition. This problem is particularly obvious when the heating element 12 first starts running, especially when the heating element 12 generates a large amount of heat as soon as it starts working. Therefore, this application has made further improvements to the above technical solution, as follows.

[0039] A plate 4 is provided on the inner top of the evaporation chamber 101. The plate 4 is made of a corrosion-resistant material, such as corrosion-resistant stainless steel, as shown in the figure. A second through hole 401 and a third through hole 402 are provided on the plate 4. The second through hole 401 is provided in a one-to-one correspondence with the first through hole 201. Specifically, the number of second through holes 401 and first through holes 201 is equal, and the shape and size of the second through holes 401 and first through holes 201 are basically the same. For example, the second through hole 401 can be slightly larger than the first through hole 201, or the second through hole 401 can be completely consistent with the first through hole 201.

[0040] As shown in the figure, the second through hole 401 and the third through hole 402 are set at intervals; or, in other words, a third through hole 402 is set between every two adjacent second through holes 401. Both the second through holes 401 and the third through holes 402 are used to transfer gaseous working fluid, but the timing of the transfer of gaseous working fluid is different, as described in detail below.

[0041] Each second through hole 401 has a corresponding first memory metal sheet 5 at its bottom. As can be seen from the figure, the first memory metal sheet 5 includes a mounting part 502 and an inclined part 503 connected by a bending part 501. The mounting part 502 is fixedly connected to the lower surface of the plate 4. For example, the fixed connection between the mounting part 502 and the plate 4 can be achieved by spot welding. The inclined part 503 is inclinedly disposed below the second through hole 401.

[0042] The specific working process of the first memory metal sheet 5 is as follows: When the heating element 12 is not working, the temperature inside the evaporation chamber 101 is low, and the state of the first memory metal sheet 5 at this time is as follows: Figure 6 As shown by the solid line, the tilt angle of the inclined portion 503 is relatively large. When the heating element 12 operates, causing the liquid working fluid to transform into a gaseous working fluid and accumulate above the heating element 12, the gaseous working fluid preferentially enters the adjacent condenser tube 3 and exchanges heat with the external environment. Specifically, it enters the interior of the condenser tube 3 through the space between the inclined portion 503 and the plate 4, as well as through the second through hole 401 and the first through hole 201, thereby exchanging heat with the external environment through the condenser tube 3. During this process, the temperature of the gaseous working fluid causes the tilt angle of the inclined portion 503 to gradually decrease. The minimum tilt angle of the inclined portion 503 is as follows: Figure 6 As shown by the dotted line, the reduced inclination angle of the inclined portion 503 reduces the space between the inclined portion 503 and the plate 4, thus reducing the amount of gaseous working fluid that can pass through this space. Meanwhile, the continuous heating of the heating element 12 generates more gaseous working fluid, increasing the pressure inside the evaporation chamber 101. Consequently, the gaseous working fluid is forced to enter the condenser tube 3, which is farther away from it. This solves the technical problems of overload of the near-end condenser tube 3, idleness of the far-end condenser tube 3, and only some condenser tubes 3 working normally in existing heat pipe heat exchange devices. It enables each condenser tube 3 to work normally, improves the heat exchange efficiency of the entire heat exchange device, and avoids local overheating that could damage the heating element and the heat exchange device.

[0043] Furthermore, in this technical solution, the interiors of the two third through holes 402 near both ends of the plate 4 are each equipped with a vertically flexible support structure for thermal expansion and contraction. Specifically, as shown in the figure, the two third through holes 402 near both ends of the plate 4 refer to the two third through holes 402 located at the leftmost and rightmost ends of the plate 4. The specific number of elastic support structures inside each third through hole 402 is not limited; for example, it can be two as shown in the figure, or three or four, etc., and the specific number can be adjusted adaptively according to the actual situation. The vertically flexible support structure for thermal expansion and contraction means that the elastic support structure can expand and contract vertically according to temperature changes.

[0044] The top of the elastic support structure is fixedly connected to the sealing plate 2, and the bottom of the elastic support structure is fixedly connected to the plate 4. For example, at low temperatures, the elastic support structure is in a contracted state, and the top surface of the plate 4 is against the lower surface of the sealing plate 2. Only a very small amount of the gaseous working fluid inside the evaporation chamber 101 can enter between the plate 4 and the sealing plate 2, which is almost negligible. At this time, the gaseous working fluid mainly enters the interior of the condenser tube 3 through the second through hole 401. At high temperatures, the elastic support structure is in an extended state, and a gap is formed between the top surface of the plate 4 and the lower surface of the sealing plate 2. The gaseous working fluid inside the evaporation chamber 101 can enter the interior of the condenser tube 3 through this gap.

[0045] The working principle of the above scheme is as follows: When the heating element 12 is not working, the angle between the inclined part 503 and the plate 4 is at its maximum; then, when the heating element 12 starts to generate heat, the liquid working fluid is converted into a gaseous state under the action of the heat from the heating element 12 and accumulates above the heating element 12. At this time, the gaseous working fluid will pass through the space between the inclined part 503 and the plate 4, as well as the second through hole 401 and the first through hole 201, and enter the interior of the condenser tube 3. Heat exchange will occur between the condenser tube 3 and the external environment. In this process, the temperature of the gaseous working fluid will cause the inclined part 503 to tilt. As the angle gradually decreases, it becomes more difficult for the gaseous working fluid to enter the adjacent condenser tube 3, thus forcing the gaseous working fluid to enter the condenser tube 3 that is farther away. Subsequently, as the gaseous working fluid enters the condenser tube 3 that is farther away, the angle of the inclined part 503 corresponding to the condenser tube 3 also decreases. At the same time, the elastic support structure will also elongate under the temperature action of the gaseous working fluid, causing the plate 4 to move down and separate from the sealing plate 2 to form a gap. The gaseous working fluid enters the condenser tube 3 through the third through hole 402 and the gap, thus preventing the gaseous working fluid inside the evaporation chamber 101 from becoming too high.

[0046] In this technical solution, the elastic support structure includes a wave-shaped second memory metal sheet 6. The top end of the second memory metal sheet 6 is fixedly connected to the sealing plate 2. Specifically, the top end of the second memory metal sheet 6 is fixedly connected to a fixing seat 7, which is fixedly installed on the bottom of the plate 4 by welding or other means.

[0047] Specifically, the bottom end of the second memory metal sheet 6 is fixedly connected to the plate 4 via a connecting rod 9; a connecting seat 8 is fixedly connected to the bottom end of the second memory metal sheet 6, the connecting seat 8 is in the shape of an inverted isosceles triangle, and the connecting rod 9 and the connecting seat 8 are fixedly connected by welding or other means.

[0048] In the above scheme, the initial deformation temperature of the first memory metal sheet 5 and the second memory metal sheet 6 can be set to 45℃~55℃, while the complete deformation temperature can be set to 70℃~100℃.

[0049] Furthermore, in this technical solution, each of the four corner positions of the plate 4 is fixedly equipped with a supplementary block 10. The supplementary block 10 is fixedly connected to the plate 4 through a connecting piece 11. The upper surface of the connecting piece 11 is flush with the upper surface of the plate 4. When the elastic support structure is in an extended state, at least part of the supplementary block 10 is located below the liquid surface of the liquid working medium. The function of the supplementary block 10 is that after a large amount of liquid working medium is converted into gaseous working medium, or when the gaseous working medium condenses into liquid and cannot fall back into the evaporation chamber 101 in time, the supplementary block 10 extends into the remaining liquid working medium inside the evaporation chamber 101. This can raise the liquid level of the remaining liquid working medium inside the evaporation chamber 101, ensuring that the heating position of the heating element 12 can be completely covered by the liquid working medium. This design can also ensure the heat dissipation effect of the heating element 12 while reducing the amount of liquid working medium used, and at the same time reduce the volume of the entire heat exchange device to a certain extent.

[0050] Specifically, the replacement block 10 includes a corrosion-resistant shell 1001 and a sealing cavity 1002 disposed inside the corrosion-resistant shell 1001. The corrosion-resistant shell 1001 can be made of pure titanium, and the sealing cavity 1002 is filled with a weight-increasing body 1003. In this embodiment, the weight-increasing body 1003 can be water or the like, allowing for easy adjustment of the volume of the weight-increasing body 1003 according to actual conditions, thus preventing the overall weight of the replacement block 10 from being too heavy or too light.

[0051] Furthermore, a feeding pipe 1004 is fixedly connected to the side of the corrosion-resistant shell 1001, and a sealing plug 1005 is sealed to the port of the feeding pipe 1004. The sealing plug 1005 can be detachably sealed to the feeding pipe 1004 by means of threaded connection or other means, which facilitates the adjustment of the volume of the weight-adding body 1003.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heat pipe heat exchange device, characterized in that, The device includes a shell, a sealing plate, and several condenser tubes. Several first through holes are provided through the sealing plate. The shell and the sealing plate together form an evaporation chamber for containing a liquid working fluid. The heating element is disposed inside the evaporation chamber and is submerged in the liquid working fluid. The bottom end of the condenser tubes is connected to the evaporation chamber through the first through holes. The top of the evaporation chamber is provided with a flat plate, and a second through hole and a third through hole are provided on the flat plate. The second through hole is provided in a one-to-one correspondence with the first through hole, and the second through hole and the third through hole are provided at intervals. Each of the second through holes is provided with a first memory metal sheet at its bottom. The first memory metal sheet includes a mounting part and an inclined part connected by a bending part. The mounting part is fixedly connected to the lower surface of the plate, and the inclined part is inclinedly disposed below the second through hole. When the heating element is not working, the angle between the inclined part and the plate is the largest. The temperature of the gaseous working fluid will cause the inclination angle of the inclined part to gradually decrease. The interior of the two third through holes near both ends of the plate is provided with a vertically elastic support structure that expands and contracts with heat. The top of the elastic support structure is fixedly connected to the sealing plate, and the bottom of the elastic support structure is fixedly connected to the plate. When the elastic support structure is in a contracted state, the top surface of the plate rests against the lower surface of the sealing plate; when the elastic support structure is in an extended state, a gap is formed between the top surface of the plate and the lower surface of the sealing plate.

2. The heat pipe heat exchange device according to claim 1, characterized in that, The elastic support structure includes a wave-shaped second memory metal sheet, the top end of which is fixedly connected to a sealing plate, and the bottom end of which is fixedly connected to a plate via a connecting rod.

3. The heat pipe heat exchange device according to claim 2, characterized in that, The bottom end of the second memory metal sheet is fixedly connected to a connecting seat, which is in the shape of an inverted isosceles triangle, and the connecting rod is fixedly connected to the connecting seat.

4. The heat pipe heat exchange device according to claim 2, characterized in that, The top of the second memory metal sheet is fixedly connected to a fixing seat, which is fixedly installed on the bottom of the plate.

5. The heat pipe heat exchange device according to claim 1, characterized in that, Each of the four corners of the plate is fixedly equipped with a replacement block. When the elastic support structure is in an extended state, at least part of the replacement block is located below the liquid surface of the liquid working fluid.

6. The heat pipe heat exchange device according to claim 5, characterized in that, The replacement block includes a corrosion-resistant shell and a sealed cavity disposed inside the corrosion-resistant shell, the sealed cavity being filled with a weight-adding body.

7. The heat pipe heat exchange device according to claim 6, characterized in that, A feeding pipe is fixedly connected to the side of the corrosion-resistant shell, and a sealing plug is sealed at the port of the feeding pipe.

8. The heat pipe heat exchange device according to claim 5, characterized in that, The filler block is fixedly connected to the plate via a connecting piece, and the upper surface of the connecting piece is flush with the upper surface of the plate.

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