Hourglass-type multi-cavity ribbed tube-type vapor chamber

Abstract

The utility model discloses an hourglass type multi-cavity rib pressing pipe type temperature equalizing plate which comprises a heat conduction pipe body, a first sealing part is arranged at one end of the heat conduction pipe body, a second sealing part is arranged at the other end of the heat conduction pipe body, the heat conduction pipe body comprises a first sheet body and a second sheet body, a linear groove is formed in the middle of the first sheet body, and the linear groove is formed in the middle of the second sheet body. The linear groove is formed by recessing the first sheet body towards the inner side, the linear groove extends along the two ends of the first sheet body, and the bottom of the linear groove is fixedly connected with the inner side of the second sheet body. The linear groove is rolled on the upper surface of the vapor chamber, and the bottom of the linear groove is in contact connection with the inner side of the lower part of the vapor chamber, so that a supporting effect is achieved, the installation and use strength of the vapor chamber is enhanced, the width size of the vapor chamber can be expanded, and the vapor chamber can be applied to a wider heat receiving source, so that the service life of the vapor chamber is prolonged. And the strength of the uniform temperature plate is not reduced due to size expansion, so that the overall strength is ensured, and the heat dissipation effect is also ensured.

Description

TECHNICAL FIELD

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

[0002] With the increasing heat flux density of electronic chips and the increasing power demand, the traditional air cooling technology cannot meet the heat dissipation demand of highly integrated electronic chips, and liquid cooling technology gradually becomes the market mainstream.

[0003] At present, liquid cooling technology includes direct cooling and indirect cooling. Direct cooling is to fill the case with insulating liquid such as fluorinated liquid to directly contact and dissipate heat with electronic chips. This way is limited by insulating liquid, has high cost and is not easy to maintain, and is less used in the market. Indirect cooling is to provide a liquid flow channel in the liquid cooling plate, and the fluid is brought away by the contact of the liquid cooling plate and the electronic chip. Since direct contact of the fluid and the electronic chip is avoided, indirect cooling is more popular in existing liquid cooling technology. However, the process of opening the liquid flow channel in the liquid cooling plate is relatively complex, and the cost is high, which cannot well guarantee the heat dissipation efficiency. The liquid cooling plate is easily deformed under pressure during installation and use, 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, so the liquid cooling plate with small width size cannot be applied to large chips. In order to solve the above problems, the prior art provides a support structure in the cavity of the liquid cooling plate to improve the installation strength of the liquid cooling plate. The support structure is composed of two or more columns, and each column is arranged in the liquid cooling plate. Too many columns not only occupy a lot of internal space, but also affect the circulation of the cooling liquid. In addition, it is difficult to ensure that the thickness of the column is consistent with the thickness of the liquid cooling plate, which leads to uneven and unstable heat conduction of the liquid cooling plate as a whole.

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

[0005] The utility model discloses a sandglass type multi-cavity ribbed tubular uniform temperature plate, which is characterized in that a linear groove is rolled on the upper surface of the uniform temperature plate. The bottom of the linear groove is in contact with the inner side of the lower part of the uniform temperature plate, which plays a supporting role and strengthens the installation and use strength of the uniform temperature plate. The width size of the uniform temperature plate can be expanded, and it can be applied to a wider heat source without causing a decrease in the strength of the uniform temperature plate. The linear groove is arranged in the middle part and does not occupy too much internal space, which improves the efficiency of circulation and heat conduction. The linear groove can be realized by rolling, which is simple in process and easy to prepare, and improves the 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 sandglass-shaped multi-cavity ribbed pipe type vapor chamber is provided, comprising a heat conduction pipe body with cooling liquid inside, one end of the heat conduction pipe body is provided with a first sealing part, the first sealing part is integrated with the heat conduction pipe body, the other end of the heat conduction pipe body is provided with a second sealing part, the second sealing part is integrated with the heat conduction pipe body.

[0008] The heat conduction pipe body comprises a first sheet body and a second sheet body, a linear groove is arranged in the middle of the first sheet body, the linear groove is formed by inward recessing of the first sheet body, the linear groove is arranged along both ends of the first sheet body, and the bottom of the linear groove is fixedly connected with the inner side of the second sheet body.

[0009] Preferably, the thickness of the linear groove is consistent with the thickness of the first sheet body.

[0010] Preferably, the first sheet body is provided with a heat dissipation fin on the outer side wall, and the heat dissipation fin is fixedly connected with the first sheet body.

[0011] Preferably, the first sheet body is provided with a heat dissipation fin on the outer side wall, and the heat dissipation fin is fixedly connected with the first sheet 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 first sheet 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 are arranged along the longitudinal direction of the first sheet body.

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

[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 first sheet body, and the plurality of third fold line type fins are sequentially integrated, and the wave crest of the third fold line type fin is arranged in a wave shape along the transverse direction of the first sheet 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 first sheet body, and the plurality of fourth fold line type fins are sequentially integrated, and the wave crest of the fourth fold line type fin is arranged in a straight line shape along the longitudinal direction of the first sheet body.

[0016] Preferably, a preparation method of a sandglass-shaped multi-cavity ribbed pipe type uniform temperature plate comprises the following steps:

[0017] S1, selecting a planar base material, dividing the planar base material into a first sheet area, a bending area and a second sheet area, the first sheet area and the second sheet area being of the same size, rolling a rib in the middle of the first sheet area to form a linear groove arranged along the longitudinal direction of the first sheet;

[0018] S2, after the rolling of the rib is completed, rolling the side of the first sheet area away from the bending area along the longitudinal direction of the first sheet to form a first connecting part with an arc, the first connecting part being bent towards the side of the linear groove which is recessed, rolling the side of the second sheet area away from the bending area along the longitudinal direction of the second sheet to form a second connecting part with an arc, the second connecting part being bent towards the side of the linear groove which is recessed, rolling the middle of the bending area to make the first connecting part and the second connecting part close to each other to form a U-shaped material, continuing to roll until the first connecting part and the second connecting part are in contact, welding the contact part of the first connecting part and the second connecting part to form an O-shaped pipe body;

[0019] S3, rolling the two opposite sides of the O-shaped pipe body until the bottom of the linear groove is in contact with the second sheet area, at this time, the O-shaped pipe body becomes an elliptical pipe body, cutting the elliptical pipe body to form a pipe body segment, cleaning the pipe body segment and checking for leaks;

[0020] S4, welding the contact part of the linear groove and the second sheet area of the pipe body segment, stamping one end of the pipe body segment to make the upper and lower sides of the end part in close contact and welding the contact part to form a semi-sealed pipe body segment, passing a liquid into the open end of the semi-sealed pipe body segment to test the water, after the water test, vacuumizing the semi-sealed pipe body segment from the open end and injecting a cooling liquid;

[0021] S5, stamping and welding the open end of the semi-sealed pipe body segment to seal both ends of the pipe body segment to form a uniform temperature plate.

[0022] Preferably, in the step S5, the following steps are further included:

[0023] selecting a heat dissipation fin, and tightly attaching the heat dissipation fin to an outer side wall of the uniform temperature plate;

[0024] 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.

[0025] As described above, due to the adoption of the above technical solutions, the present application has the following beneficial effects:

[0026] 1. The utility model discloses a linear groove is rolled out on the upper surface of the temperature equalizing plate, and the bottom of the linear groove is in contact with the inner side of the lower part of the temperature equalizing plate, thereby playing a supporting role, so that the installation and use strength of the temperature equalizing plate is strengthened, the width size of the temperature equalizing plate can be expanded, and the temperature equalizing plate can be applied to a wider size heat source, and the temperature equalizing plate strength will not decrease due to size expansion, the overall strength is ensured, and the heat dissipation effect is ensured.

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

[0028] 3. The linear groove of the utility model discloses only needs to be rolled to realize, and the process is simple, easy to prepare, and production efficiency is improved.

[0029] 4. The linear groove of the utility model is connected with the second sheet body, equivalent to dividing the internal space of the temperature equalizing plate into two relatively independent spaces, can be applied to two different chips, and the temperature equalizing plate can be applied to two different chips.

[0030] 5. The linear groove can be realized by rolling, the thickness of the linear groove and the thickness of the first sheet body are kept consistent, so that the prepared temperature equalizing plate is uniformly and stably heat-conducting. DRAWINGS

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

[0032] Figure 2 It is the internal structure section view of the utility model;

[0033] Figure 3 It is the rolling ribbing equipment structure schematic diagram of the utility model;

[0034] Figure 4 It is the structure schematic diagram of the roller equipment of the utility model;

[0035] Figure 5 It is the structure schematic diagram of the welding station of the utility model;

[0036] Figure 6 It is the structure schematic diagram of the heat dissipation fin of the embodiment 1 of the utility model;

[0037] Figures 7-10 It is the simulation nephogram of control 1-3 and the embodiment 1 in the comparative experiment of the utility model;

[0038] Figure 11 It is the structure schematic diagram of the heat dissipation fin of the embodiment 2 of the utility model;

[0039] Figure 12 It is the structure schematic diagram of the heat dissipation fin of the embodiment 3 of the utility model;

[0040] Figures 13-16 is the simulation cloud chart of the control 1-3 and the example 1 in the contrast experiment of the utility model.

[0041] In the drawing, 1, heat pipe body; 2, first sheet body; 3, second sheet body; 4, linear groove; 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

[0042] To make the purpose, technical scheme and advantages of the utility model more clearly and clearly, 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.

[0043] Please refer to Figures 1 to 16 The utility model provides a sandglass type multi-cavity ribbed pipe type uniform temperature plate, and the technical scheme is as follows:

[0044] As Figures 1-2 shown, a sandglass type multi-cavity ribbed pipe type uniform temperature plate, the uniform temperature plate includes heat pipe body 1, and the heat pipe body 1 is formed by connecting two sides after bending a sheet body. The heat pipe body 1 includes first sheet body 2 and second sheet body 3, and the middle part of the first sheet body 2 is provided with linear groove 4, and the linear groove 4 is formed by recessing inward from the first sheet body, and the linear groove 4 is arranged along both ends of the first sheet body 2, and the bottom of the linear groove 4 is fixedly connected with the inner side of the second sheet body 3. By arranging the linear groove 4, the mounting strength of the first sheet body 2 and the second sheet body 3 is increased, so that the uniform temperature plate made will not cause strength reduction due to the increase of width size, so that the uniform temperature plate is not prone to deformation during installation and use, avoids that the heat dissipation performance is influenced due to pipe body deformation, and since the linear groove 4 is arranged and realized by rolling, the thickness of the linear groove 4 and the thickness of the first sheet 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. Wherein, the bottom of the linear groove 4 is arranged as a plane, not only to ensure that the contact surface between the linear groove 4 and the second sheet body 3 is larger, but also to facilitate welding at the contact part of the linear groove and the second sheet body 3, to provide more reliable support for the whole.

[0045] It should be indicated that, as Figure 3As shown, the linear groove 4 is rolled by a rolling ribbing device. The rolling ribbing device comprises a base provided with a placing groove, and a rolling assembly movably arranged on the base and driven by a moving assembly. The rolling assembly comprises a roller and a motor. The motor drives the roller to rotate. The rotating roller cooperates with the moving assembly to roll the first sheet to form the linear groove 4. Specifically, when the sheet is placed in the placing groove, the moving assembly is first controlled, and then the roller is driven to rotate by the motor. The moving assembly moves while the roller rotates, and the sheet is rolled to form the linear groove on the sheet. Figure 4 As shown, the sheet after rolling ribbing is formed into the heat pipe body 1 by a roller device. Specifically, the sheet is rolled by an upper roller with gradually decreasing thickness, and cooperates with a concave wheel with gradually decreasing width, so that the sheet is gradually tightened from the flat state to the 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 close to each other. Finally, the two sides close to each other are welded by a welding station assembly to form the O-shaped pipe body. The welding station assembly is as shown. Figure 5

[0046] One end of the heat pipe body 1 is provided with a first sealing part 5, and the other end of the heat pipe body 1 is provided with a second sealing part 6. The first sealing part 5 and the second sealing part 6 are formed by stamping the end of the heat pipe body by a stamping device. Specifically, the end of the heat pipe body 1 is placed in the stamping device, and the upper and lower sides of the end of the heat pipe body 1 are stamped by the stamping device. The end of the first sheet 2 is inwardly inclined and curved to form a first bending part, and the end of the second sheet is inwardly curved to form a second bending part. The stamping makes the upper and lower sides of the end of the heat pipe body 1 close to each other, and finally the upper and lower sides close to each other are welded by a high-frequency welding station. The other end of the heat pipe body 1 is operated in the same way, and the two ends of the heat pipe body 1 are sealed to form the uniform plate.

[0047] The cavity of the uniform plate is provided with a cooling liquid. When the temperature of the heat receiving end of the uniform plate rises, the cooling liquid evaporates, the gaseous cooling material rises to the cold end of the upper side of the uniform plate, and then liquefies and falls to the hot end again, continuously circulating to achieve the effect of heat dissipation. In the cavity of the uniform plate, the linear groove is equivalent to dividing the cavity into two small cavities, and the two small cavities can independently circulate, so that the uniform plate can be applied to cool different chips at the same time.

[0048] ​Further, the liquid absorbing core is arranged on the inner side wall of the first sheet 2 and the outer side wall of the linear groove 4. 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, the liquid is quickly absorbed and diffused along the internal fiber network due to the micro-pore structure inside the liquid absorbing core, 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 of metal wire mesh to the inner side wall of the first sheet 2 and the outer side wall of the dotting groove. The metal sintering type includes powder sintering and fiber sintering. By arranging the liquid absorbing core, the heat transfer rate and the cooling liquid circulation are improved, and the heat dissipation efficiency is further improved.

[0049] As shown in Figure 6 The outer side wall of the first sheet 2 is provided with a heat dissipation fin, and the heat dissipation fin is fixedly connected with the first sheet 2. The heat dissipation fin includes a first fold line type fin 7 and a second fold line type fin 8, which are arranged alternately along the transverse direction of the first sheet 2. The first fold line type fin 7 and the second fold line type fin 8 are fixedly connected, and the peaks of the first fold line type fin 7 and the second fold line type fin 8 are arranged in a staggered manner. The first fold line type fin 7 and the second fold line type fin 8 extend along the longitudinal direction of the first sheet 2. The heat dissipation fin is in contact with the first sheet 2, which can transfer the heat of the first sheet 2 for heat dissipation, thereby improving the heat dissipation effect. The peaks of the first fold line type fin 7 and the second fold line type fin 8 of the heat dissipation fin 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.

[0050] A preparation method of a sandglass-shaped multi-cavity ribbed pipe type uniform heat spreader, characterized in that it comprises the following steps:

[0051] S1, selecting a planar base material, dividing the planar base material into a first sheet area, a bending area and a second sheet area, the first sheet area and the second sheet area are of the same size, rolling ribs in the middle of the first sheet area to roll out linear grooves arranged along the longitudinal direction of the first sheet;

[0052] S2, after rolling the ribs, rolling the side of the first sheet area away from the bending area along the longitudinal direction of the first sheet to roll out a first connecting part with an arc, the first connecting part is bent to the side of the linear groove which is recessed, rolling the side of the second sheet area away from the bending area along the longitudinal direction of the second sheet to roll out a second connecting part with an arc, the second connecting part is bent to the side of the linear groove which is recessed, rolling the middle of the bending area to make the first connecting part and the second connecting part close to each other to form a U-shaped material, continuing to roll until the first connecting part and the second connecting part are in contact, welding the contact part of the first connecting part and the second connecting part to form an O-shaped pipe body;

[0053] S3, rolling the two opposite sides of the O-shaped tube body until the bottom of the linear groove contacts the second sheet 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 the tube body segment, and detecting leakage;

[0054] S4, welding the contact part of the linear groove and the second sheet 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, 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;

[0055] 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, 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.

[0056] By adopting 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.

[0057] The utility model carries out comparison experiment, the condition is:

[0058] 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:

[0059] Table 1

[0060]

[0061] 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 7-10 .

[0062] Example 2

[0063] As Figure 11As shown in the utility model provides a sandglass type multi-cavity ribbed pipe type uniform temperature plate, 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 first sheet body longitudinal direction, 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 first sheet 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.

[0064] Embodiment 3

[0065] As Figure 12 shown, the utility model provides a sandglass type multi-cavity ribbed pipe type uniform temperature plate, 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 first sheet body transverse direction, 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 first sheet 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.

[0066] 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 adopted, the heat source condition is that the size is (10mm×10mm) and the heat flow is (50w), there is no cooling condition, and two-second instantaneous performance is obtained, and the following table 2 is obtained:

[0067] Table 2

[0068]

[0069] 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 uniform temperature plate and heat dissipation fin of the utility model. As can be seen from table 2, compared with comparative examples 1-3, the temperature of the heat source of the uniform temperature plate and heat dissipation fin of the utility model decreases 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 13-16 .

[0070] The above only is the preferred implementation manner 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 sandglass-shaped multi-cavity ribbed tubular temperature distribution plate, characterized in that, It includes a heat-conducting pipe body with coolant inside, one end of the heat-conducting pipe body is provided with a first sealing part, the first sealing part is integrated with the heat-conducting pipe body, and the other end of the heat-conducting pipe body is provided with a second sealing part, the second sealing part is integrated with the heat-conducting pipe body. The heat-conducting tube body includes a first plate and a second plate. A linear groove is provided in the middle of the first plate. The linear groove is formed by the inward indentation of the first plate and extends along both ends of the first plate. The bottom of the linear groove is fixedly connected to the inner side of the second plate.

2. The hourglass-shaped multi-cavity ribbed tubular heat spreader according to claim 1, characterized in that: The thickness of the linear groove is the same as the thickness of the first sheet.

3. The hourglass-shaped multi-cavity ribbed tubular heat spreader according to claim 1, characterized in that: It also includes a liquid-absorbing core, which is fixedly disposed on the inner side wall of the first sheet and the outer side wall of the linear groove.

4. The hourglass-shaped multi-cavity ribbed tubular heat spreader according to claim 1, characterized in that: The outer wall of the first plate is provided with heat dissipation fins, which are fixedly connected to the first plate.

5. The hourglass-shaped multi-cavity ribbed tubular heat spreader according to claim 4, characterized in that: The heat dissipation fins include a first zigzag fin and a second zigzag fin. The first zigzag fin and the second zigzag fin are arranged alternately in the transverse direction of the first sheet body. The first zigzag fin and the second zigzag fin are fixedly connected, and the crests of the first zigzag fin and the crests of the second zigzag fin are staggered. Both the first zigzag fin and the second zigzag fin extend longitudinally along the first sheet body.

6. The hourglass-shaped multi-cavity ribbed tubular heat spreader according to claim 5, characterized in that: Both the first and second zigzag-shaped fins have square wave-shaped cross sections.

7. The hourglass-shaped multi-cavity ribbed tubular heat spreader according to claim 4, characterized in that: The heat dissipation fins include a third zigzag fin group, which includes a plurality of third zigzag fins arranged sequentially along the longitudinal direction of the first fin body. The plurality of third zigzag fins are connected in sequence as one unit, and the crests of the third zigzag fins are arranged in a wavy shape along the transverse direction of the first fin body.

8. The hourglass-shaped multi-cavity ribbed tubular heat spreader according to claim 4, characterized in that: The heat dissipation fins include a fourth zigzag fin group, which includes a plurality of fourth zigzag fins arranged sequentially along the transverse direction of the first fin body. The plurality of fourth zigzag fins are connected in sequence as one unit, and the crests of the fourth zigzag fins are arranged in a straight line along the longitudinal direction of the first fin body.

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