Multi-cavity folded rib pipe type vapor chamber

Abstract

The utility model discloses a multi-cavity folding rib pipe type temperature equalizing plate which comprises a temperature equalizing pipe body, one end of the temperature equalizing pipe body is provided with a first sealing part, the other end of the temperature equalizing pipe body is provided with a second sealing part, the temperature equalizing pipe body comprises an upper pipe body and a lower pipe body, the upper pipe body and the lower pipe body are connected into a whole, and a folding rib is arranged in the middle of the upper pipe body. The folding ribs extend towards the two ends along the axis of the upper pipe body, and the bottoms of the folding ribs are fixedly connected with the inner side of the lower pipe body. The folding ribs are formed on the upper surface of the vapor chamber in a rolling mode, the bottoms of the folding ribs are in contact connection with the inner side of the lower portion of the vapor chamber, the supporting effect is achieved, the two opposite inner side walls of the folding ribs are tightly attached, and therefore the supporting strength is doubled, the overall installation strength and use strength of the vapor chamber are greatly improved, and the service life of the vapor chamber is prolonged. The width size of the vapor chamber can be expanded, the vapor chamber can be applied to a wider heat receiving source, the strength of the vapor chamber cannot be reduced due to size expansion, the overall strength is guaranteed, and the heat dissipation effect is also guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of uniform temperature plate preparation, especially relates to a multi-cavity ribbed pipe type uniform temperature plate. BACKGROUND

[0002] With the continuous increase of electronic chip heat flux density and the increase of power demand, the traditional air cooling technology has been unable to meet the heat dissipation demand of highly integrated electronic chips, and liquid cooling technology has gradually become the market mainstream.

[0003] At present, liquid cooling technology includes direct cooling and indirect cooling, direct cooling is that the insulation liquid such as fluorinated liquid is filled in the case and directly contacts with electronic chips to dissipate heat, this mode is limited by the insulation liquid, the cost is high and is not easy to maintain, and the application in the market is less. Indirect cooling is that a liquid flow channel is arranged in the liquid cooling plate, fluid is heat carried through the contact of the liquid cooling plate and electronic chips, since the direct contact of fluid and electronic chips is avoided, indirect cooling is more popular in the existing liquid cooling technology, but the process of opening the liquid flow channel in the liquid cooling plate is relatively complex, the cost is high, and the heat dissipation efficiency cannot be well ensured. The liquid cooling plate is easily deformed under pressure in the installation and use process, which seriously affects the overall heat dissipation performance, in order to ensure the installation strength of the liquid cooling plate, the width size of the liquid cooling plate cannot be expanded, therefore the liquid cooling plate with small width size cannot be applied to large chips, in order to solve the above problems, the prior art improves the installation strength of the liquid cooling plate by separately arranging a supporting structure in the cavity of the liquid cooling plate, the supporting structure is composed of two or more than two columns, and each column is arranged in the liquid cooling plate in a spaced manner, too many columns not only occupy a large amount of internal space, but also affect the circulation of the cooling liquid, and it is difficult to ensure that the thickness of the column is consistent with the thickness of the liquid cooling plate, therefore the overall heat conduction of the liquid cooling plate is uneven and unstable.

[0004] Therefore, it is necessary to provide a multi-cavity ribbed pipe type uniform temperature plate. UTILITY MODEL CONTENTS

[0005] The utility model discloses a kind of multi-cavity ribbed pipe type uniform temperature plates, and the purpose is to: in view of the above problems, by rolling out rib in the upper surface of uniform temperature plate, the bottom of rib is contacted and connected with the lower part of the inner side of uniform temperature plate, which plays a supporting role, and the two opposite inner walls of rib are closely fitted, so that the supporting strength is doubled, greatly improve the installation strength and use strength of the overall uniform temperature plate, so that the width size of uniform temperature plate can be expanded, applied to wider size heat source, and the strength of uniform temperature plate will not be reduced due to size expansion, which not only ensures overall strength, but also ensures heat dissipation effect, rib is arranged in the middle, does not occupy too much internal space, improves the efficiency of circulation heat conduction, and rib process is simple, easy to prepare, improve production efficiency.

[0006] To achieve the above-mentioned utility model purposes, the utility model adopts the technical scheme as follows:

[0007] According to one aspect of the present application, a multi-cavity ribbed pipe type vapor chamber is provided, comprising a vapor chamber body, one end of the vapor chamber body is provided with a first sealing part, the first sealing part is integrated with the vapor chamber body, the other end of the vapor chamber body is provided with a second sealing part, the second sealing part is integrated with the vapor chamber body;

[0008] The vapor chamber body comprises an upper pipe body and a lower pipe body, the upper pipe body and the lower pipe body are integrated, the middle part of the upper pipe body is provided with a rib, the rib extends to both ends along the axis of the upper pipe body, and the bottom of the rib is fixedly connected with the inner side of the lower pipe body.

[0009] Preferably, the rib is recessed inward from the upper pipe body to form a U-shaped part, and the two opposite inner side walls of the U-shaped part are closely fitted.

[0010] Preferably, the vapor chamber further comprises a liquid absorption core, which is fixedly arranged on the inner side wall of the upper pipe body and the outer side wall of the rib.

[0011] Preferably, the outer side wall of the upper pipe body is provided with a heat dissipation fin, and the heat dissipation fin is fixedly connected with the upper pipe body.

[0012] Preferably, the heat dissipation fin comprises a first fold line type fin and a second fold line type fin, the first fold line type fin and the second fold line type fin are arranged alternately along the transverse direction of the upper pipe body, the first fold line type fin and the second fold line type fin are fixedly connected, the wave crest of the first fold line type fin is arranged in a staggered manner with the wave crest of the second fold line type fin, and the first fold line type fin and the second fold line type fin extend along the longitudinal direction of the upper pipe body.

[0013] Preferably, the cross section of the first fold line type fin and the second fold line type fin is square wave shaped.

[0014] Preferably, the heat dissipation fin comprises a third fold line type fin group, the third fold line type fin group comprises a plurality of third fold line type fins arranged along the longitudinal direction of the upper pipe body, and the plurality of third fold line type fins are integrated in sequence, and the wave crest of the third fold line type fin is arranged in a wave shape along the transverse direction of the upper pipe body.

[0015] Preferably, the heat dissipation fin comprises a fourth fold line type fin group, the fourth fold line type fin group comprises a plurality of fourth fold line type fins arranged along the transverse direction of the upper pipe body, and the plurality of fourth fold line type fins are integrated in sequence, and the wave crest of the fourth fold line type fin is arranged in a straight line shape along the longitudinal direction of the upper pipe body.

[0016] Preferably, a method for preparing a multi-cavity ribbed tube-type heat spreader includes the following steps:

[0017] S1. Select a flat substrate and divide the flat substrate into an upper tube area, a bending area and a lower tube area. Roll out a U-shaped part in the middle of the upper tube area. Then squeeze the two opposite outer walls of the U-shaped part to gradually reduce the width of the U-shaped part until the two opposite inner walls of the U-shaped part are tightly attached to form a rib.

[0018] S2. After the rib is formed, the side of the upper tube area away from the bending area is rolled along the longitudinal direction of the upper tube body to roll out the first connecting part with an arc. The first connecting part is bent toward the side where the rib is concave. The side of the lower tube area away from the bending area is rolled along the longitudinal direction of the lower tube body to roll out the second connecting part with an arc. The second connecting part is bent toward the side where the rib is concave. Then the middle of the bending area is rolled to bring the first connecting part and the second connecting part closer to each other to form a U-shaped material. Rolling continues until the first connecting part and the second connecting part contact each other. The contact point between the first connecting part and the second connecting part is welded to form an O-shaped tube body.

[0019] S3. Roll the two opposite sides of the O-ring until the bottom of the rib contacts the lower tube area. At this point, the O-ring becomes an elliptical tube. Cut the elliptical tube to form tube segments. Clean the tube segments and check for leaks.

[0020] S4. Weld the contact point between the ribs in the pipe section and the lower pipe section, then stamp one end of the pipe section to make the upper and lower sides of the end in close contact, and weld the contact part to form a semi-sealed pipe section. Introduce liquid into the open end of the semi-sealed pipe section for water testing. After the water testing, evacuate the semi-sealed pipe section from the open end and inject coolant.

[0021] S5. Stamp and weld the open end of the semi-sealed pipe section to seal both ends of the pipe section and form a temperature equalization plate.

[0022] Preferably, step S5 further includes the following step:

[0023] Select heat dissipation fins and attach them tightly to one outer wall of the heat spreader.

[0024] Welding is performed at the contact point between the heat dissipation fins and the heat spreader to fix the heat dissipation fins to the outer wall of the heat spreader.

[0025] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0026] 1. The utility model discloses a rib is rolled out on the upper surface of the temperature equalizing plate, and the bottom of the rib is in contact with the lower inner side of the temperature equalizing plate, which plays a supporting role. The two opposite inner walls of the rib are tightly attached, thereby doubling the supporting strength, greatly improving the overall installation strength and use strength of the temperature equalizing plate, and expanding the width size of the temperature equalizing plate. The temperature equalizing plate can be applied to a wider size heat source without causing a decrease in the strength of the temperature equalizing plate due to size expansion, thereby ensuring overall strength and heat dissipation effect.

[0027] 2. The rib is arranged in the middle part, does not occupy too much internal space, and improves the efficiency of circulating heat conduction.

[0028] 3. The rib has a simple process, is easy to prepare, and improves production efficiency.

[0029] 4. The rib and the lower pipe body are connected to divide the internal space of the temperature equalizing plate into two relatively independent spaces, the temperature equalizing plate can be applied to two different chips, and the two chips are cooled, thereby improving the utilization rate of the temperature equalizing plate.

[0030] 5. The thickness of the rib, the upper pipe body and the lower pipe body is consistent, so that the overall heat conduction of the temperature equalizing plate is uniform and stable. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic view of the three-dimensional structure of the utility model;

[0032] Figure 2 is a sectional view of the internal structure of the utility model;

[0033] Figure 3 is a schematic view of the cross section of the utility model;

[0034] Figure 4 is an enlarged schematic view of I of the utility model;

[0035] Figure 5 is a schematic view of the rib rolling equipment structure of the utility model;

[0036] Figure 6 is a schematic view of the structure of the roller equipment of the utility model;

[0037] Figure 7 is a schematic view of the structure of the welding station of the utility model;

[0038] Figure 8 is a schematic view of the structure of the heat dissipation fin of embodiment 1 of the utility model;

[0039] Figures 9-12 is a simulation cloud chart of control 1-3 and embodiment 1 in the comparative experiment of the utility model;

[0040] Figure 13 is a schematic diagram of the heat dissipation fin structure of embodiment 2 of the utility model;

[0041] Figure 14 is a schematic diagram of the heat dissipation fin structure of embodiment 3 of the utility model;

[0042] Figures 15-18 is a simulation cloud chart of control 1-3 and embodiment 1 in the comparative experiment of the utility model.

[0043] In the drawings, 1, uniform temperature pipe body; 2, upper pipe body; 3, lower pipe body; 4, folded rib; 5, first sealing part; 6, second sealing part; 7, first fold line type fin; 8, second fold line type fin; 9, third fold line type fin; 10, fourth fold line type fin. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the following preferred embodiments are referred to and are given, and the utility model is further explained in detail. However, it should be indicated that many details listed in the specification are only for making the reader have a thorough understanding of one or more aspects of the utility model, and the aspects of the utility model can be realized even without these specific details.

[0045] Please refer to Figures 1 to 18 The utility model provides a kind of multi-cavity folded rib pipe type heat spreader, technical scheme as follows:

[0046] As Figures 1-4 Indicated, a kind of multi-cavity folded rib pipe type heat spreader, heat spreader includes uniform temperature pipe body 1, uniform temperature pipe body 1 is formed by the folding of a piece of body and is connected by two sides. Uniform temperature pipe body 1 includes upper pipe body 2 and lower pipe body 3, the middle part of upper pipe body 2 is provided with folded rib 4, folded rib 4 is formed U-shaped portion by the inward recess of upper pipe body 2, two opposite inner side walls of U-shaped portion are closely adhered, folded rib 4 is extended and is arranged along the axis of upper pipe body 2 to two ends, the bottom of folded rib 4 is fixedly connected with the inner side of lower pipe body 3. By setting folded rib 4, the installation strength of upper pipe body 2 and lower pipe body 3 is increased, and two opposite inner side walls of folded rib 4 are closely adhered, so that the support strength is doubled, so that the heat spreader made will not cause the strength to drop due to the increase of width size, simultaneously, the heat spreader is not prone to deformation when installing and using, avoids the heat dissipation performance from being influenced due to pipe body deformation, and because the folded rib 4 set is realized by rolling, therefore the thickness of folded rib 4 and the thickness of upper pipe body 2 can be controlled to be consistent, so that the overall thermal conductivity is more uniform, and the heat conduction rate is more easily controlled.

[0047] It should be indicated that, as Figure 5As shown, the fold 4 is prepared by a fold rolling device. The fold rolling device comprises a plurality of roller groups arranged in sequence, each roller group comprising two rollers arranged vertically, the initial roller being used to roll out a U-shaped part with a larger width, the subsequent rollers being used to gradually reduce the width of the U-shaped part, and the last roller being used to extrude the U-shaped part so that the two opposite inner side walls of the U-shaped part are tightly fitted. Specifically, when the sheet is placed on the fold rolling device, the first roller group is first controlled to roll out a U-shaped part using the first roller group, and the U-shaped part passes through the second roller, the third roller, and so on until the two opposite inner side walls of the U-shaped part are in contact, and then passes through the last roller to extrude the two opposite outer side walls of the U-shaped part so that the two opposite inner side walls of the U-shaped part are tightly fitted, thereby forming the fold 4 on the sheet. As shown in Figure 6 After the fold 4 is formed, the sheet is processed into a uniform temperature tube body by a roller device. Specifically, the sheet is rolled by an upper roller with gradually decreasing thickness, and is matched with a concave roller with gradually decreasing width, so that the sheet is gradually tightened on both sides from a flat state to a U-shaped profile. Finally, the tightening roller is replaced, and the U-shaped profile is continuously rolled to make the two sides of the U-shaped profile tightly fitted. Finally, the two tightly fitted sides are welded by a welding station assembly to form an O-shaped tube body. The welding station assembly is as shown in Figure 7 .

[0048] One end of the uniform temperature tube body 1 is provided with a first sealing part 5, and the other end of the uniform temperature tube body 1 is provided with a second sealing part 6. The first sealing part 5 and the second sealing part 6 are both formed by stamping the end of the uniform temperature tube body 1 by a stamping device. Specifically, the end of the uniform temperature tube body 1 is placed in the stamping device, and the upper and lower sides of the end of the uniform temperature tube body 1 are stamped by the stamping device. The end of the upper tube 2 is bent inwardly to form a first bending part, and the end of the lower tube 3 is bent inwardly to form a second bending part. The stamping makes the upper and lower sides of the end of the uniform temperature tube body 1 tightly fitted, and finally the tightly fitted parts are welded by a high-frequency welding station. The same operation is performed on the other end of the uniform temperature tube body 1 to seal the two ends of the uniform temperature tube body 1, thereby forming a uniform temperature plate.

[0049] The cavity of the uniform temperature plate is provided with a cooling liquid. After the temperature of the cooling liquid in the uniform temperature plate increases, the cooling liquid evaporates, the gaseous cooling substance rises to the cold end on the upper side of the uniform temperature plate, and then liquefies and falls back to the hot end, thereby continuously circulating to achieve the effect of heat dissipation. In the cavity of the uniform temperature plate, the fold 4 separates the cavity into two small cavities, and the two small cavities can perform relatively independent gas-liquid circulation, so that the uniform temperature plate can also be applied to simultaneously cool different chips.

[0050] Further, the inner side wall of the upper pipe body 2 and the outer side wall of the folded rib 4 are further provided with a liquid absorbing core. The liquid absorbing core is based on the capillary effect and the principle of liquid dynamics. When the liquid contacts the surface of the liquid absorbing core, due to the micro-pore structure inside the liquid absorbing core, the liquid is quickly absorbed and diffused along the internal fiber network, forming a "wicking" phenomenon. This effect enables the liquid to return to the evaporation end under the action of gravity, thereby facilitating heat transfer and circulation. The liquid absorbing core includes a metal mesh type or a metal sintering type. The metal mesh type is to attach a certain mesh number of metal wire mesh to the inner side wall of the upper pipe body 2 and the outer side wall of the dot groove. The metal sintering type includes powder sintering and fiber sintering. By providing the liquid absorbing core, the heat transfer rate and the cooling liquid circulation are improved, and the heat dissipation efficiency is further improved.

[0051] As shown in Figure 8 The outer side wall of the upper pipe body 2 is provided with a heat dissipation fin, and the heat dissipation fin is fixedly connected with the upper pipe body 2. The heat dissipation fin includes a first fold line type fin 7 and a second fold line type fin 8, the first fold line type fin 7 and the second fold line type fin 8 are arranged alternately along the transverse direction of the upper pipe body 2, the first fold line type fin 7 and the second fold line type fin 8 are fixedly connected, and the wave crest of the first fold line type fin 7 and the wave crest of the second fold line type fin 8 are arranged in a staggered manner, and the first fold line type fin 7 and the second fold line type fin 8 are arranged in a staggered manner. The wave crest of the second fold line type fin 8 extends along the longitudinal direction of the upper pipe body. The heat dissipation fin is in contact with the upper pipe body 2, and can dissipate the heat of the upper pipe body 2, thereby improving the heat dissipation effect. The wave crest of the first fold line type fin 7 and the wave crest of the second fold line type fin 8 are arranged in a staggered manner, so that the first fold line type fin 7 and the second fold line type fin 8 form a staggered gap, air can flow through the staggered gap, and the heat dissipation effect of the heat dissipation fin is improved.

[0052] The utility model discloses still disclose a kind of multi-cavity folded rib pipe type uniform temperature plate, comprising the following steps:

[0053] S1, plane base material is selected, plane base material is divided into upper pipe body area, bending area and lower pipe body area, U-shaped part of U shape is rolled out in the middle part of upper pipe body area, then the width of U-shaped part is gradually reduced by extruding two opposite outer side walls of U-shaped part, until the opposite two inner side walls of U-shaped part are closely attached, and folded rib is formed;

[0054] S2, after the formation of folded rib, the side of upper pipe body area away from bending area is rolled along the longitudinal direction of upper pipe body, and the first connecting part with arc is rolled out, the first connecting part is bent to the side of recess of folded rib, the side of lower pipe body area away from bending area is rolled along the longitudinal direction of lower pipe body, and the second connecting part with arc is rolled out, the second connecting part is bent to the side of recess of folded rib, then the middle part of bending area is rolled, so that the first connecting part and the second connecting part are close to each other, and U-shaped material is formed, continue to roll, until the first connecting part and the second connecting part contact, the contact place of the first connecting part and the second connecting part is welded, and O-shaped pipe body is formed;

[0055] S3, rolling the two opposite sides of the O-shaped tube body until the bottom of the folded rib contacts the lower tube body area, at this time, the O-shaped tube body becomes an elliptical tube body, cutting the elliptical tube body to form a tube body segment, cleaning and leak detecting the tube body segment;

[0056] S4, welding the contact part of the folded rib and the lower tube body area in the tube body segment, and stamping one end of the tube body segment to make the upper and lower sides of the end part tightly contact and weld the contact part to form a semi-sealed tube body segment, and passing a liquid into the open end of the semi-sealed tube body segment to test water, and after testing water, vacuumizing the semi-sealed tube body segment from the open end and injecting cooling liquid;

[0057] S5, stamping and welding the open end of the semi-sealed tube body segment to seal both ends of the tube body segment to form a uniform temperature plate, and selecting a heat dissipation fin, tightly attaching the heat dissipation fin to one outer side wall of the uniform temperature plate, and welding the contact part of the heat dissipation fin and the uniform temperature plate to fix the heat dissipation fin on the outer side wall of the uniform temperature plate.

[0058] By using the preparation process, the process is simple, the preparation efficiency is improved, and the process cost is reduced, and the uniform temperature plate with better heat dissipation performance can be prepared by the process.

[0059] The utility model carries out contrast experiment, the condition is:

[0060] Under the same external size (120mm*26mm T=2mm), compared with aluminum plate, O-shaped tube without internal support and harmonica tube with internal columnar support, the same heat source is adopted, the heat source condition is: size (10mm*10mm) heat flow (50w), without cooling condition, two-second instantaneous performance, and the following table 1 is obtained:

[0061] Table 1

[0062]

[0063] In table 1, comparative example 1 is aluminum plate, comparative example 2 is O-shaped tube, comparative example 3 is harmonica tube, and example 1 is the uniform temperature plate of the utility model. It can be seen from table 1 that the heat source temperature of the uniform temperature plate of the application drops obviously, the heat dissipation effect is remarkable, the weight is smaller, and the heat dissipation performance is better. The simulation nephogram is as shown in Figures 9-12 .

[0064] Example 2

[0065] As Figure 13As shown in the utility model provides a multi-cavity ribbed pipe type heat spreader, different from embodiment 1, in this embodiment, the heat dissipation fin includes third fold line type fin group, third fold line type fin group includes a plurality of third fold line type fins 9 arranged along the longitudinal direction of upper pipe body, a plurality of third fold line type fins 9 are sequentially connected as a whole, and the wave crest of third fold line type fin 9 is arranged in the form of wave along the transverse direction of upper pipe body. The heat dissipation fin in the form of wave improves the space of air circulation, so that the air can take away more heat of the heat dissipation fin, thereby improving the heat dissipation effect.

[0066] Embodiment 3

[0067] As Figure 14 shown, the utility model provides a multi-cavity ribbed pipe type heat spreader, different from embodiment 1, in this embodiment, the heat dissipation fin includes fourth fold line type fin group, fourth fold line type fin group includes a plurality of fourth fold line type fins 10 arranged along the transverse direction of upper pipe body, a plurality of fourth fold line type fins 10 are sequentially connected as a whole, and the wave crest of fourth fold line type fin 10 is arranged in the form of straight line along the longitudinal direction of upper pipe body. The heat dissipation fin in the form of straight line improves the heat dissipation efficiency, and is simple to manufacture, convenient for production and improves production efficiency.

[0068] Under the same external size (120mm×26mm T=2mm), compared with the combination of aluminum plate and heat dissipation fin, the combination of O-shaped pipe without internal support and heat dissipation fin and the combination of harmonica pipe with internal columnar support and heat dissipation fin, the same heat source is used, and the heat source condition is: size (10mm×10mm) heat flow (50w), without cooling condition, two-second instantaneous performance, and the following table 2 is obtained:

[0069] Table 2

[0070]

[0071] In table 2, comparative example 1 is the combination of aluminum plate and heat dissipation fin, comparative example 2 is the combination of O-shaped pipe and heat dissipation fin, comparative example 3 is the combination of harmonica pipe and heat dissipation fin, and example 1 is the combination of the heat spreader and heat dissipation fin of the utility model. As can be seen from table 2, the combination of the heat spreader and heat dissipation fin of the present application is obviously reduced in heat source temperature, has remarkable heat dissipation effect, and has better heat dissipation performance. The simulation cloud picture is as shown in Figures 15-18 .

[0072] The above only is the preferred embodiment of the utility model, and it should be pointed out that for ordinary skilled person in the art, on the premise of not departing from the principle of the utility model, a plurality of improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the utility model.

Claims

1. A multi-cavity ribbed pipe type uniform temperature plate, characterized by, The even temperature pipe body is provided with a first sealing part at one end and a second sealing part at the other end, and the first and second sealing parts are integrated with the even temperature pipe body; The even temperature pipe body comprises an upper pipe body and a lower pipe body, the upper pipe body is integrated with the lower pipe body, the middle part of the upper pipe body is provided with a fold, the fold extends to both ends along the axis of the upper pipe body, and the bottom of the fold is fixedly connected with the inner side of the lower pipe body.

2. The multi-cavity ribbed pipe heat spreader of claim 1, wherein: The fold is recessed inwardly from the upper pipe body to form a U-shaped part, and the two opposite inner side walls of the U-shaped part are tightly fitted.

3. The multi-cavity ribbed pipe heat spreader of claim 1, wherein: An absorbent core is further provided, which is fixedly arranged on the inner side wall of the upper pipe body and the outer side wall of the fold.

4. The multi-cavity ribbed pipe heat spreader of claim 1, wherein: The outer side wall of the upper pipe body is provided with a heat dissipation fin, and the heat dissipation fin is fixedly connected with the upper pipe body.

5. The multi-cavity ribbed tube type heat spreader according to claim 4, characterized in that: The heat dissipation fin comprises a first fold line type fin and a second fold line type fin, the first fold line type fin and the second fold line type fin are arranged alternately along the transverse direction of the upper pipe body, the first fold line type fin and the second fold line type fin are fixedly connected, the wave crest of the first fold line type fin is arranged in a staggered manner with the wave crest of the second fold line type fin, and the first fold line type fin and the second fold line type fin extend along the longitudinal direction of the upper pipe body.

6. The multi-cavity ribbed tube type heat spreader according to claim 5, characterized in that: The cross section of the first fold line type fin and the second fold line type fin is square wave shaped.

7. The multi-cavity ribbed tube type heat spreader according to claim 4, characterized in that: The heat dissipation fin comprises a third fold line type fin group, the third fold line type fin group comprises a plurality of third fold line type fins arranged along the longitudinal direction of the upper pipe body, the plurality of third fold line type fins are integrated, and the wave crest of the third fold line type fin is arranged in a wave shape along the transverse direction of the upper pipe body.

8. The multi-cavity ribbed tube type heat spreader according to claim 4, characterized in that: The heat dissipation fin comprises a fourth fold line type fin group, the fourth fold line type fin group comprises a plurality of fourth fold line type fins arranged along the transverse direction of the upper pipe body, the plurality of fourth fold line type fins are integrated, and the wave crest of the fourth fold line type fin is arranged in a straight line along the longitudinal direction of the upper pipe body.

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