TWI660149B - Loop heat pipe with liquid bomb tube - Google Patents

Abstract

A loop heat pipe with a liquid bomb tube includes: an evaporation cavity having a shell and a capillary material disposed in the shell; a return pipe having two ends connected to the shell respectively; and a working fluid , Injected into the evaporation chamber; wherein a part defining a predetermined length of the return pipe body is a condensation section, defining a portion of the return pipe from the condensation section to the steam end as a steam section, and defining the return pipe from the condensation section The part to the liquid end is a liquid section. The liquid section of the return pipe is provided with at least one partition, and the liquid section of the return pipe is divided into two or more liquid bomb tubes, and the two or more liquid bomb tubes are refluxed. The tubes are not connected to each other, and the diameters of the two or more liquid bomb tubes are smaller than the diameter of the return pipe. The two or more liquid bomb tubes are connected to the condensation section and the inside of the casing.

Description

Loop heat pipe with liquid bomb tube

The invention relates to a loop heat pipe, in particular to a loop heat pipe having a liquid bomb pipe.

Taiwan Patent No. 604173 discloses a loop heat pipe, the shell of which includes an outer shell and an inner shell. The thermal conductivity of the outer shell is higher than the thermal conductivity of the inner shell, and the heat conduction opening of the inner shell is provided with a capillary element to match the external Circulate the pipeline to form a loop heat pipe. The liquid pipeline provided by the technology in this case does not have an additional design to make the liquid flow more easily. When the liquid passes through, it is not easy to smoothly return to the casing.

Taiwan Patent No. 304467 discloses another type of loop heat pipe, which is mainly provided with a flexible braided pulse tube in a liquid pipeline, so that the liquid can flow back more smoothly. However, this technology requires the combination of a flexible braided vessel to its liquid line and condensing section. This structure increases the assembly process during manufacturing and also requires sintering, which not only increases manufacturing costs, but also may Or the sintering is poor and the yield is reduced.

The main object of the present invention is to provide a loop heat pipe with a liquid bomb tube, which has an internal partition in the liquid section of the return pipe to form a smaller diameter pipe, so as to achieve the effect that the liquid operating fluid can generate a liquid bomb, and the liquid operating Without capillary force, the liquid can still propel the liquid bomb by the pressure difference inside the return pipe, and it can smoothly return to the evaporator.

Yet another object of the present invention is to provide a loop heat pipe with a liquid-elastic tube. The liquid section of the return tube does not have the problem of assembling woven vessels or other capillary materials, which can reduce manufacturing costs and improve yield.

In order to achieve the above object, the present invention provides a loop heat pipe with a liquid bomb tube, which includes: an evaporation cavity, a casing, and a capillary material disposed in the casing. The capillary material does not occupy the interior of the casing. A steam space is formed between the shell and the casing; a return pipe having two ends is defined as a steam end and a liquid end, respectively. The steam end of the return pipe is connected to the shell and communicates with the space, and the reflux The liquid end of the tube is connected to the casing and communicates with the interior of the casing; and a working fluid is injected into the evaporation chamber; wherein a portion defining a predetermined length of the return tube body is a condensation section, and the surface of the condensation section Used to set a heat dissipation unit, define the part of the return pipe from the condensation section to the steam end as the steam section, and define the part of the return pipe from the condensation section to the liquid end as the liquid section, and the internal part of the liquid section of the return pipe At least one partition is provided, and the liquid section of the return tube is divided into two or more liquid bomb tubes. The two or more liquid bomb tubes are not connected to each other in the return tube, and the calibers of the two or more liquid bomb tubes are uniform. Smaller than the return pipe The two or more liquid bomb tube are in communication and the inner housing of the condensing section.

In this way, the liquid section of the return pipe of the present invention has internally partitioned into a smaller diameter pipe, thereby achieving the effect that the liquid working fluid can generate a liquid bomb, and the liquid working fluid can still be used without capillary force. The pressure difference inside the return pipe pushes the liquid bomb and smoothly returns to the evaporator. In addition, because the return tube of the present invention does not have the problem of assembling a braided vessel or other capillary materials in the liquid section, the manufacturing cost can be reduced and the yield can be improved.

In order to explain the technical features of the present invention in detail, the following preferred embodiments are described in conjunction with the drawings as follows, wherein:

As shown in FIGS. 1 to 6, a loop heat pipe 10 with a liquid bomb tube provided by the first preferred embodiment of the present invention is mainly composed of an evaporation chamber 11, a return pipe 21, and a working fluid 31. ,among them:

The evaporation chamber 11 has a casing 12 and a capillary material 14 disposed in the casing 12. The capillary material 14 does not fill the interior of the casing 12 and forms a steam space 16 between the casing 12 and the casing 12. The steam space 16 has a common chamber 161 and a plurality of branch chambers 162. The plurality of branch chambers 162 are separated from each other by the capillary 14 at a predetermined distance, and the plurality of branch chambers 162 are connected to the common chamber 161, except for this communicating portion. In addition, the plurality of branch chambers 162 do not communicate with each other at other locations. The capillary material 14 is sintered from copper powder in this embodiment.

The return pipe 21 has two ends and is defined as a steam end 214 and a liquid end 216, respectively. The steam end 214 of the return pipe 21 is connected to the casing 12 and communicates with the space. The liquid end of the return pipe 21 216 is connected to the casing 12 and communicates with the inside of the casing 12.

The working fluid 31 in this embodiment takes pure water as an example, is injected into the evaporation chamber 11, is adsorbed by the capillary material 14, and exists in a part of the return pipe 21.

Wherein, a part of the body of the return pipe 21 with a predetermined length is defined as a condensation section 22, and a surface of the condensation section 22 is provided with a heat dissipation unit 100. The heat dissipation unit 100 may be a plurality of fins in actual implementation. In addition, a portion of the return pipe 21 from the condensation section 22 to the steam end 214 is defined as a vapor section 24, and a portion of the return pipe 21 from the condensation section 22 to the liquid end 216 is defined as a liquid section 26, and the return pipe The liquid section 26 of 21 is provided with a partition 28 therein, and the liquid section 26 of the return pipe 21 is divided into two sub-tube bodies and defined as liquid bomb tubes 29 respectively. The two liquid bomb tubes 29 are disposed on the return pipe 21. The liquid sections 26 are not connected to each other, and the diameters of the two liquid bomb tubes 29 are smaller than the diameter of the return pipe 21. The two liquid bomb tubes 29 communicate with the condensation section 22 and the inside of the casing 12. This partitioning member 28 may be a plate body and integrally formed with the return pipe 21 during actual manufacturing. The working fluid 31 is located in the liquid section 26 of the return pipe 21.

In this embodiment, in addition to the liquid section 26, the partition member 28 extends to the condensation section 22 and extends to the entire length of the condensation section 22, but does not extend to the vapor section 24. Since the condensing section 22 is a place where the vaporous working fluid condenses into a liquid working fluid, the partition 28 extends to the entire length of the condensing section 22, which represents the entirety of the liquid bomb tube 29 formed in the condensing section 22 Since the liquid bomb tube 29 is a pipe with a smaller diameter than the return tube 21, it can achieve the effect of forming a liquid bomb from the liquid working fluid, which can make the liquid working fluid pass through the interior of the return tube 21 without capillary force. The pressure difference pushes the liquid bomb, which smoothly flows back into the evaporation chamber 11 and is absorbed by the capillary material 14.

In this embodiment, the pipe diameter of the steam section 24 is the same as the pipe diameter of the liquid section 26. In addition, the diameter of each liquid bomb tube 29 is smaller than the diameter of the vapor section 24 of the return tube 21. This can clearly define the size relationship between the diameter of the liquid bomb tube 29 compared to the return tube 21, and it can also be understood that the effect of the small diameter of the liquid bomb tube 29 is easy to form a liquid bomb.

It should be added that, as shown in Fig. 4, when the partition member 28 'is a plate, its cross-sectional shape may not necessarily be linear, but may be arc-shaped. In addition, as shown in FIG. 5, the number of the partition members 28 ″ is not necessarily one, but may be three partition members 28 ″, and the return pipe 21 ″ is divided into three liquid bomb tubes 29 ″. . Further, as shown in FIG. 6, the partition 28 '' 'may not be plate-shaped, but may be a tube wall portion after hollowed out into a pipe body as shown in FIG. 6 in a cross section.

The structure of the first embodiment has been described above, and the use state of the first embodiment is described next.

Please refer to FIG. 1 and FIG. 2. Before use, place the evaporation chamber 11 on a heat-dissipating object (such as a computer's central processing unit CPU, not shown), and place it on the return pipe 21. The condensing section 22 is provided with a heat dissipation unit 100. In this embodiment, the heat dissipation unit 100 is composed of a plurality of fins.

In use, the thermal energy of the object to be dissipated will be transferred to the evaporation chamber 11, and the working fluid adsorbed by the capillary material 14 inside the evaporation chamber 11 will evaporate into a vaporous working fluid and be dispersed in the steam space 16. The plurality of branch chambers 162 can help provide enough space for the vapor-phase operating fluid to spread and flow to the common chamber 161 and then enter the vapor section 24 of the return pipe 21 until reaching the condensation section 22. With the effect that the heat energy is taken away by the air through the heat dissipation unit 100 provided in the condensation section 22, the temperature inside the condensation section 22 is lower than the temperature of the evaporation chamber 11, which will cause the vaporous working fluid flowing to the condensation section 22 Due to cooling, the liquid working fluid condenses into a droplet shape and is attached to the wall of each liquid bomb tube 29 in the condensation section 22. As more and more condensed liquid actuating liquids are formed, the liquid actuating liquids in the shape of water droplets become larger and larger, and finally liquid bombs 311 occupying the cross section of the liquid bomb tube 29 are formed. Since the caliber of each liquid bomb tube 29 is smaller than the return tube 21, the effect of making the liquid working fluid into a liquid bomb can be achieved. In addition, the gaseous working fluid continuously enters the condensation section 22 from the steam section 24, and naturally forms a pressure difference, and the liquid bomb 311 is pushed from the condensation section 22 to the liquid pipe, and finally flows into the evaporation chamber 11 and is again The capillary material 14 is adsorbed. In this way, the thermal energy of the object to be dissipated can be continuously extracted, and a good heat dissipation effect can be achieved.

It can be known from the above that the liquid section 26 of the return pipe 21 has a liquid bomb tube 29 which is internally partitioned into a smaller caliber, which can achieve the effect of forming a liquid bomb from a liquid working fluid, and can make the liquid working fluid without capillary forces. The liquid bomb can still be pushed back by the pressure difference inside the return pipe 21 to smoothly return to the evaporation chamber 11. In addition, the present invention does not assemble braided vessels or other capillary materials in the liquid section 26 of the return tube 21. Compared with the conventional technology, the present invention can reduce the manufacturing cost and improve the yield.

As shown in FIG. 7, a loop heat pipe 40 with a liquid bomb tube provided by the second preferred embodiment of the present invention is mainly similar to the first embodiment disclosed above, except that:

A water storage space 47 is formed between the capillary material 44 and the casing 42. The water storage space 47 is in communication with the liquid end of the return pipe, and the water storage space 47 is not in communication with the steam space 46. This water storage space 47 can be used to adjust the amount of water in the working fluid. This design is because the traditional loop heat pipe itself needs a liquid section to return the liquid working fluid, but if the working fluid in the evaporation chamber is mostly located in the return pipe, The steam section, the condensation section and the liquid section have not returned yet. At this time, the amount of water in the evaporation chamber may be too small to work effectively, which is also called dry burning state. Therefore, this water storage space 47 can provide the effect of adjusting the amount of water in the working fluid, so that the working fluid 49 in the evaporation chamber 41 can be maintained at a certain amount, thereby avoiding the problem of dry burning.

In addition, in the second embodiment, the partition 58 does not extend into the condensation section 52. In this way, although the liquid operating liquid cannot directly enter each liquid bomb tube 59 in the condensation section 52, it still enters the liquid tube and enters each liquid bomb tube 59 after the amount of water reaches a certain level. It can be understood that the liquid bomb formation effect of this structure will be slightly inferior to that of the first embodiment described above, but the liquid bomb tube 59 of the liquid section 56 can still achieve the liquid bomb formation Effect, and easier to return to the evaporation chamber 41.

It can be understood from this second embodiment that if the partition 58 extends only from the liquid section 56 to half of the condensation section 52 in length, then the liquid bomb tube 59 formed by it of course extends to the condensation section 52 In half the length, the effect of this structure in forming a liquid bomb will be better than the above-mentioned structure of the second embodiment, but inferior to the structure of the aforementioned first embodiment.

The rest of the structure and the effects that can be achieved in this second embodiment are the same as those in the first embodiment, and will not be described again.

As shown in FIG. 8, a loop heat pipe 60 with a liquid bomb tube provided by the third preferred embodiment of the present invention is mainly similar to the first embodiment disclosed above, except that:

The partition 68 extends not only to the condensation section 62 but also to the steam end 614 of the steam section 64.

This structure will allow the vapor-phase working fluid to directly enter the small-diameter liquid bomb tube 69 when passing through the vapor section 64, but since it has not yet reached the condensation section 62, even a small amount of vapor-phase working fluid will condense into small water droplets. However, the amount of water is very small, which is not enough to form a liquid bomb. In other words, this structure does not affect the overall work efficiency. However, because the entire return tube 61 is a liquid bomb tube structure, it can be used directly. The tube is assembled without the need to separately manufacture the part without the partition, and it is not necessary to determine whether the partition 68 has been correctly extended to the position of the condensation section 62 as in the first embodiment. Therefore, this third embodiment is In one embodiment, the manufacturing cost is further saved.

The rest of the structure and the effects that can be achieved in the third embodiment are the same as those in the first embodiment, and will not be described again.

As shown in FIG. 9, a loop heat pipe 70 with a liquid bomb tube provided by the fourth preferred embodiment of the present invention is mainly similar to the first embodiment disclosed above, except that:

The return pipe 71 has two pipe bodies 71a, 71b. One pipe body 71b serves as the liquid section 76 and the condensation section 72, and the other pipe body 71a serves as the steam section 74. The pipe body diameter of the steam section 74 is smaller than the liquid section. 76 and the diameter of the tube body of the condensation section 72. The liquid section 76 and the tube body 71b of the condensation section 72 are connected to a part of the outer portion of the tube body 71a of the steam section 74 to connect the internal space. This structure mainly explains the connection relationship of the return pipe 71 formed by the connection of the two pipe bodies 71a and 71b, but it can be further understood that the pipe body 71b as the liquid section 76 and the condensation section 72 can be provided with a partition inside The tube body 71a as the steam section 74 is not provided with a partition.

The aforementioned structure can achieve the effect of using two different pipe bodies connected to form the return pipe 71.

The rest of the structure and the effects that can be achieved in the fourth embodiment are the same as those in the first embodiment, and will not be described again.

As shown in FIG. 10, a loop heat pipe 80 having a liquid bomb tube provided by the fifth preferred embodiment of the present invention is mainly similar to the fourth embodiment disclosed previously, except that:

The return pipe 81 has two pipe bodies 81a, 81b. One pipe body 81b serves as the liquid section 86 and the condensation section 82, and the other pipe body 81a serves as the steam section 84. The pipe body 81a of the steam section 84 is sleeved on The outer part of the other tube body 81b is connected to each other, and the internal space is communicated. Since the caliber of the pipe body 81a of the steam section 84 is smaller than the caliber of the other pipe body 81b, in actual implementation, the pipe section 81a of the steam section 84 is first expanded to expand the caliber, and then It is socketed and connected to the other pipe body 81b.

In the foregoing structure, when the diameter of the pipe body 81a of the steam section 84 is smaller than that of the other pipe body 81b, the small-diameter pipe body can still be used to socket the large-diameter pipe body.

The rest of the structure and the effects that can be achieved in the fifth embodiment are the same as those in the fourth embodiment, and will not be described again.

10‧‧‧Loop heat pipe with liquid bomb

11‧‧‧ evaporation chamber

12‧‧‧shell

14‧‧‧ Wool

16‧‧‧Steam space

161‧‧‧share room

162‧‧‧Branch

21,21 ’’, 21 ’’ ’‧‧‧ return tube

214‧‧‧Steam end

216‧‧‧Liquid end

22‧‧‧Condensing section

24‧‧‧Steam section

26‧‧‧Liquid section

28,28 ’, 28’ ’, 28’ ’’ ‧‧‧ divider

29,29’’‧‧‧ liquid bomb tube

31‧‧‧working fluid

311‧‧‧ liquid bomb

40‧‧‧Loop heat pipe with liquid bomb

41‧‧‧ evaporation chamber

42‧‧‧shell

44‧‧‧ Wool

46‧‧‧Steam space

47‧‧‧Water storage space

49‧‧‧working fluid

52‧‧‧Condensing section

56‧‧‧Liquid section

58‧‧‧ divider

59‧‧‧ liquid bomb tube

60‧‧‧Loop heat pipe with liquid bomb

61‧‧‧Return pipe

62‧‧‧Condensing section

64‧‧‧Steam section

614‧‧‧Steam end

68‧‧‧ divider

69‧‧‧ liquid bomb tube

70‧‧‧ loop heat pipe with liquid bomb

71‧‧‧ return tube

71a, 71b ‧‧‧ tube body

72‧‧‧ Condensing section

74‧‧‧Steam section

76‧‧‧Liquid section

80‧‧‧ loop heat pipe with liquid bomb tube

81‧‧‧ return tube

81a, 81b‧‧‧ tube

82‧‧‧Condensing section

84‧‧‧Steam section

86‧‧‧Liquid section

100‧‧‧ cooling unit

FIG. 1 is a perspective view of a first preferred embodiment of the present invention. FIG. 2 is a schematic horizontal sectional view of FIG. 1. FIG. 3 is a schematic cross-sectional view of a partial element of the first preferred embodiment of the present invention, showing a cross-sectional structure of a return pipe and a partition. FIG. 4 is another schematic cross-sectional view of the first preferred embodiment of the present invention, which mainly shows the cross-sectional structure of another partition member. FIG. 5 is another schematic cross-sectional view of the first preferred embodiment of the present invention, which mainly shows the cross-sectional structure of yet another partition member. FIG. 6 is another schematic cross-sectional view of the first preferred embodiment of the present invention, which mainly shows the cross-sectional structure of yet another separator. FIG. 7 is a schematic horizontal sectional view of a second preferred embodiment of the present invention. FIG. 8 is a schematic horizontal sectional view of a third preferred embodiment of the present invention. FIG. 9 is a schematic horizontal sectional view of a fourth preferred embodiment of the present invention. Fig. 10 is a schematic horizontal sectional view of a fifth preferred embodiment of the present invention.

Claims (12)

A loop heat pipe with a liquid bomb tube includes: an evaporation cavity having a shell and a capillary material disposed in the shell; the capillary material does not fill the interior of the shell and forms a space between the shell and the shell; Steam space; a return pipe with two ends defined as a steam end and a liquid end, the steam end of the return pipe is connected to the housing and communicates with the space, and the liquid end of the return pipe and the housing It is connected to communicate with the interior of the casing; and a working fluid is injected into the evaporation chamber; wherein a part of the predetermined length of the return tube body is defined as a condensation section, and a surface of the condensation section is provided with a heat dissipation unit, which defines The part of the return pipe from the condensation section to the steam end is a steam section, and the part of the return pipe from the condensation section to the liquid end is a liquid section. At least one separator is arranged inside the liquid section of the return pipe, and The liquid section of the return tube is divided into two or more liquid bomb tubes, the two or more liquid bomb tubes are not connected to each other in the return tube, and the diameters of the two or more liquid bomb tubes are smaller than the diameter of the return tube. More than two liquid bomb tubes are connected to the Condensing section and the inside of the shell. The loop heat pipe with a liquid bomb tube according to item 1 of the patent application scope, wherein the at least one partition member extends from the liquid section of the return pipe to the condensation section. The loop heat pipe with a liquid bomb tube according to item 2 of the patent application scope, wherein the at least one partition member extends to the entire length of the condensation section. The loop heat pipe with a liquid bomb tube according to item 1 of the scope of the patent application, wherein the at least one partition is extended from the liquid section of the return pipe to the condensation section and then to the steam end of the steam section. A loop heat pipe with a liquid bomb tube according to item 1 of the scope of the patent application, wherein the return pipe has two tubes, one tube as the liquid section and the condensation section, and the other tube as the steam section and the steam section. The caliber of the pipe body is smaller than that of the liquid section and the condensing section. The pipe system of the liquid section and the condensing section is connected to a part of the outer part of the pipe section of the steam section to connect, so that the internal space is connected. A loop heat pipe with a liquid bomb tube according to item 1 of the scope of the patent application, wherein the return pipe has two tubes, one tube as the liquid section and the condensation section, and the other tube as the steam section and the steam section. The pipe system is connected to the outer part of another pipe body to connect, so that the internal space is connected. The loop heat pipe with a liquid bomb tube according to item 1 of the scope of the patent application, wherein the at least one partition member is plural in number, and then the liquid section of the return pipe is divided into a plurality of liquid bomb tubes. The loop heat pipe with a liquid bomb tube according to item 1 of the scope of the patent application, wherein a water storage space is formed between the capillary material and the casing, the water storage space is in communication with the liquid end of the return pipe, and the The water storage space is not connected with the steam space. The loop heat pipe with a liquid bomb tube according to item 1 of the scope of patent application, wherein the steam space has a common room and a plurality of branch rooms, the plurality of branch rooms are separated from each other by a predetermined distance, and the plurality of branch rooms are connected to the common room . A loop heat pipe with a liquid-elastic tube according to item 1 of the scope of the patent application, wherein the capillary material is sintered from copper powder. The loop heat pipe with a liquid bomb tube according to item 1 of the scope of the patent application, wherein the tube diameter of each liquid bomb tube is smaller than the tube diameter of the steam section of the return tube. The loop heat pipe with a liquid bomb tube according to item 1 of the scope of the patent application, wherein the at least one partition is integrally formed with the return pipe.