TW201945680A - Loop heat pipe having different pipe diameters characterized in allowing a working liquid to be rapidly returned to the evaporating chamber so as to increase the heat dissipation efficiency - Google Patents

Abstract

A loop heat pipe having different pipe diameters includes: an evaporating chamber, having a housing and a capillary member disposed in the housing, wherein the capillary member does not fully occupy the interior of the housing and an evaporating space is formed between the capillary member and the housing; a condensing unit, having a heat dissipating member disposed outside and having a flow channel disposed inside, wherein one end of the flow channel is formed as a gas connecting end, another end thereof is formed as a liquid connecting end, and an inner diameter of the gas connecting end is larger than an inner diameter of the liquid connecting end; a gas flowing pipe, wherein one end thereof is connected to the housing and communicated with the evaporating space, and another end thereof is connected to the gas connecting end of the condensing unit and communicated with the flow channel; and a liquid flowing pipe, wherein one end thereof is connected to the housing and communicated with the interior of the housing, another end thereof is connected to the liquid connecting end of the condensing unit and communicated with the flow channel, and an inner diameter of a pipe body of the liquid flowing pipe is smaller than an inner diameter of a pipe body of the gas flowing pipe, so that a working liquid can be rapidly returned to the evaporating chamber so as to increase the heat dissipation efficiency.

Description

Loop heat pipes with different pipe diameters

The present invention relates to a heat dissipation device, and particularly to a loop heat pipe with different pipe diameters.

Patent No. CN1060524448A discloses a loop heat pipe having a hollow pipe body bent into a fold-back shape and divided into two pipeline channels, one for the evaporation section and the other for the condensation section, and the two pipe ports and the pipe walls on the opposite sides of each other Set as a flat wall surface, the closed end cover has a closed end and a set of set ends, and the set of set ends is provided with a set of mouth shapes. When the two tube ports are set, the two tube ports are closely abutted against each other; Patent CN1060524449A discloses a loop heat pipe, which is also a two-pipe hollow pipe body with an evaporation section and a condensation section. A closed end cover is set at the two pipe port set, and the closed end cover has a closed end and A set of group ends, the set ends are set as a set of mouth shape, when the two tube ports are set, the gap between the sleeve port and the two tube ports is filled by a joint filler; CN106091761A patent, A loop heat pipe is disclosed, which is also a two-pipe hollow pipe body having an evaporation section and a condensation section. A closed end cover is set at the two tube port, and the closed end cover has a closed end and a set of ends. , The set end is set to have two sets of mouth shape for the two tubes The steam flow path and the condensing flow path provided by the aforementioned three cases are all set to the same (large) round diameter pipe body, and there is no additional design to make the liquid flow more easily. The liquid type of working fluid During circulation, it is not easy to return to the steam flow path smoothly, resulting in a slow circulation speed and limited heat dissipation efficiency.

The main purpose of the present invention is to set the liquid flow tube to have a smaller diameter than the vapor flow tube to produce the effect of a liquid bomb, so that the liquid working liquid can smoothly return to the evaporation chamber and improve the heat dissipation efficiency.

In order to achieve the foregoing object, a loop heat pipe with different pipe diameters provided according to the present invention includes: an evaporation cavity having a shell and a capillary material disposed in the shell, the capillary material not occupying the shell An evaporation space is formed between the inside of the body and the shell; a condensing part is provided with a heat dissipation unit on the outside, and a circulation passage is arranged inside, one end of the circulation passage is set as a steam connection end, and the other end is set as a liquid connection End, the inner diameter of the steam connection end is larger than the inner diameter of the liquid connection end; a steam flow tube, one end of which is connected to the housing and communicates with the evaporation space, and the other end is connected to the steam connection of the condensing member and is connected to the circulation channel Communicating; a liquid flow tube, one end of which is connected to the casing and is in communication with the interior of the casing, and the other end is connected to the liquid connection end of the condensing member and is in communication with the circulation channel; The inner diameter of the flow tube.

As a result, the diameter of the liquid flow tube of the present invention is smaller than the diameter of the vapor flow tube, so that the liquid working fluid can form a liquid bomb effect, and the liquid bomb can be pushed by the pressure difference without capillary force. , So that the liquid working liquid can be smoothly returned to the evaporation chamber, thereby improving heat dissipation efficiency.

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 3, a loop heat pipe 10 with different pipe diameters provided by the first preferred embodiment of the present invention is mainly composed of an evaporation chamber 11, a condensing member 21, a steam flow pipe 31, a The liquid flow tube 41 and an operating fluid 51 are composed of:

The evaporation chamber 11 has a casing 12 and a capillary material 13 disposed in the casing 12. The capillary material 13 does not fill the interior of the casing 12 and forms an evaporation space 125 with the casing 12; The casing 12 is composed of an upper cover 121 and a receiving box 122. The capillary material 13 is disposed in the receiving box 122. The upper cover 121 covers the receiving box 122, and a sidewall is provided around the receiving box 122. A first hole 123 and a second hole 124 are provided on the side wall. The first hole 123, the second hole 124, and the evaporation space 125 are located on the same side of the containing box 122. Larger than the aperture of the second hole 124, the first hole 123 is in communication with the evaporation space 125, and one end of the steam pipe 31 is inserted to connect to the casing 12, and the second hole 124 corresponds to the liquid pipe One end of 41 is plugged in and connected to the casing 12. The capillary material 13 has a plurality of channels 131, and the channel openings 132 of each of the channels 131 communicate with the evaporation space 125. In this embodiment, the capillary material 13 is made of copper powder sintered.

The condensing element 21 is set as a hollow U-shaped elbow in the embodiment, and a heat dissipation unit 100 is provided on the outside. The inside of the elbow has a circulation channel 211 penetrating both ends of the elbow, and defines the circulation channel. One end of 211 is a steam connection end 212 and the other end is a liquid connection end 213. The inner diameter of the steam connection end 212 corresponds to the diameter of the first hole 123 of the housing 12 and is larger than the liquid connection end 213. The inner diameter of the liquid junction end 213 corresponds to the diameter of the second hole 124 of the casing 12. The heat dissipating unit 100 may be a plurality of fins, and is arranged around the peripheral side of the U-shaped elbow.

The steam flow pipe 31 is a hollow pipe, and is set as a curved pipe with a predetermined length in this specification, and its pipe diameter corresponds to that of the first hole 123 of the casing 12 and the steam connection end 212 of the condensing member 21. Inner diameter, one end of the steam flow tube 31 is inserted into the first hole 123 of the casing 12 and communicates with the evaporation space 125. The other end of the steam flow tube 31 is connected to the steam connection end 212 of the condensing element 21 and is connected to the The circulation channel 211 is communicated.

The liquid flow tube 41 is a hollow tube. In this specification, the vapor flow tube 31 is a curved tube with a predetermined length. The diameter of the liquid flow tube 41 corresponds to the second hole 124 and the condensing part of the casing 12. The inner diameter of the liquid connection end 213 and the inner diameter of the liquid flow tube 41 are smaller than the inner diameter of the steam flow tube 31. One end of the liquid flow tube 41 is inserted into the second hole 124 of the casing 12. It communicates with the inside of the casing 12, the other end of the liquid flow tube 41 is connected to the liquid connection end 213 of the condensing element 21 and communicates with the circulation channel 211 (as shown in FIG. 3).

The working fluid 51, in this embodiment, pure water is taken as an example, injected into the evaporation chamber 11, absorbed by the capillary material 13, and exists in a part of the loop heat pipe 10.

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

With the above structure, a heating source (such as an electronic device) is placed on the evaporation chamber 11 during actual operation. When the heating source (not shown) is operated for a period of time, heat is generated. The heating source The heat is transferred to the evaporation chamber 11 by heat conduction, and the heat is directed to the capillary material 13. Most of the working fluid 51 is stored in the capillary material 13 in a liquid form. When heat is introduced into the capillary material 13, the capillary The temperature of the material 13 rises, so that the liquid working fluid stored in the capillary material 13 absorbs enough heat, and then gradually evaporates to form a gaseous working fluid. The gaseous working fluid is passed from the capillary 13 to each of the channel openings 132 of the plurality of channels 131. Move to the evaporation space 125 and collect, and then enter the steam flow pipe 31 and continue to advance in the direction of the condensing element 21, and enter the condensing element 21 from the steam connection end 212. With the heat dissipating unit 100 provided outside the condensing member 21, the vapor-phase operating fluid passing through the condensing member 21 dissipates heat into the air, and the vapor-phase operating fluid condenses into a droplet-like liquid operating fluid due to cooling, and is attached to The tube wall of the condensing element 21. However, as more and more condensed liquid actuating fluids are formed, the liquid actuating fluids in the shape of water droplets are becoming larger and larger, and because the liquid end 213 of the condensing member 21 is smaller, the liquid actuating fluids in the shape of water droplets may be faster. The liquid filling terminal 213 fills the liquid flow tube 41 and forms a liquid bomb 511 that fills the cross section of the liquid flow tube 41. Furthermore, the diameter of the liquid flow tube 41 is small. In the case of no capillary force, the liquid bomb 511 can be pushed by the pressure difference between the vapor flow tube 31 and the liquid flow tube 41, so that the liquid bomb 511 can flow in the liquid flow. The flow in the tube 41 is easier and faster. In addition, the gaseous actuating fluid continuously enters the condensing member 21 from the vapor flow tube 31, which will form a force that propels the liquid bomb 511 forward, and finally flows back to the evaporation. The inside of the cavity 11 is adsorbed by the capillary material 13. In this way, the thermal energy of the heating source can be continuously exported to achieve a good heat dissipation effect.

As can be seen from the above, in the present invention, the liquid flow pipe 41 is set to have a smaller diameter than the steam flow pipe 31, and the condensation piece 21 connecting the steam flow pipe 31 and the liquid flow pipe 41 is also set to have a smaller diameter than the liquid connection end 213. It is smaller than the steam connection end 212, so a liquid bomb 511 can be formed in the liquid flow tube 41 with a small cross-sectional area (as shown in FIG. 3), and the steam flow tube 31 can be used without capillary force. The pressure difference with the liquid flow tube 41 pushes the liquid bomb 511, so that the liquid operating liquid returns to the evaporation chamber 11 more smoothly and quickly.

Please refer to FIG. 4 and FIG. 5 again, a loop heat pipe 10 'with a condenser tube provided by the second preferred embodiment of the present invention is mainly the same as the first preferred embodiment disclosed above, with the differences Lies in:

The first hole 123 'and the evaporation space 125' are located on the same side of the containing box 122 ', the first hole 123' and the second hole 124 'are located on different sides of the containing box 122', the first hole A hole 123 'has a larger diameter than the second hole 124'. The first hole 123 'is in communication with the steam space 125', and is correspondingly inserted into one end of the steam pipe 31 'to connect to the casing 12. ', The second hole 124' corresponds to one end of the liquid flow tube 41 'for plugging and connecting to the casing 12', the condensing member 21 'is a hollow tube, and the circulation channel 211' is provided in the hollow tube The two ends of the hollow tube are penetrated inside and form the steam connection end 212 'and the liquid connection end 213', respectively. The inner diameter of the steam connection end 212 'is larger than the inner diameter of the liquid connection end 213'. The heat dissipating unit 100 'has a plurality of fins arranged around the peripheral side of the hollow tube.

The remaining steps of the second embodiment and the effects that can be achieved are the same as those of the first embodiment disclosed above, and will not be described again.

It also has the effect that the diameter of the liquid flow tube 41 'is smaller than that of the vapor flow tube 31', so that the liquid working fluid can form the effect of the liquid bomb 511 '. Without the capillary force, the liquid flow tube 31' and the liquid The pressure difference in the flow tube 41 ′ promotes the liquid bomb 511 ′, so that the liquid bomb 511 ′ can flow more smoothly in the liquid flow tube 41 ′ (as shown in FIG. 5). To the evaporation chamber 11 ', the effect is smoother and faster.

Please refer to FIG. 6 to FIG. 8 again, a loop heat pipe 10 with a condensing pipe provided by the third preferred embodiment of the present invention is mainly the same as the first preferred embodiment disclosed previously, with the differences Lies in:

The condensing element 21 "is a rectangular block in this embodiment, and a pipe is provided inside to form the circulation channel 211". The two ends of the pipe form the steam connection end 212 "and the liquid connection end 213", respectively. The steam connection end 212 "and the liquid connection end 213" pass through the outside of the block, and the inner diameters of the steam connection end 212 "and the liquid connection end 213" correspond to the steam flow tube 31 "and the liquid flow, respectively. The diameter of the tube 41 ", the inner diameter of the steam connection end 212" is larger than the inner diameter of the liquid connection end 213 ", for the one end of the steam flow tube 31" to be inserted into the assembly to communicate with the circulation channel 211 ", the The liquid connection end 213 "is used for one end of the liquid flow tube 41" to be inserted into a group to communicate with the circulation channel 211 ". The heat dissipation unit (not shown) has a plurality of fins and is directly disposed on the block during implementation.

The remaining steps of the third embodiment and the effects that can be achieved are the same as those of the first embodiment disclosed previously, and will not be described again.

By setting the liquid flow pipe 41 "to have a smaller diameter than the steam flow pipe 31", and the condensation piece 21 "and the flow passage 211" connecting the steam flow pipe 31 "and the liquid flow pipe 41" are also provided. The type with a smaller pore diameter at the liquid junction 213 "and a larger pore diameter at the vapor junction 212" can form the liquid working fluid with the effect of a liquid bomb 511 ", and without the capillary force by the steam The pressure difference between the flow tube 31 "and the liquid flow tube 41" promotes the liquid bomb 511 ", so that the liquid bomb 511" can flow more smoothly in the liquid flow tube 41 "(as shown in Fig. 8). The liquid operating fluid can be returned to the evaporation chamber 11 "more smoothly and quickly, and the heat dissipation efficiency of the loop heat pipe of the present invention can be improved.

In the third preferred embodiment, the first hole 123 "and the second hole 124" are located on the same side of the containing box 122 ", and the steam flow tube 31" and the liquid flow tube 41 "are arranged in On the same side of the accommodating box 122 ", the arrangement of the steam connection end 212" and the liquid connection end 213 "of the condensing member 21" can be adapted for the steam flow tube 31 "and the liquid flow tube 41" to be inserted and combined with each other. The circulation channel 211 "may be communicated with each other; the first hole 123" and the second hole 124 "may be located on different sides of the containing box 122", and the steam flow pipe 31 "and the liquid flow pipe 41 "The two ends of the condensing member 21" whose flow channel 211 "penetrates the two sides of the rectangular block, and the steam connection ends 212 of the two ends of the flow channel 211" are connected to the liquid connection. The end 213 "is also set to correspond to the structure that can be used to insert the steam flow tube 31" and the liquid flow tube 41 ". The type shown in the second embodiment can also improve the heat dissipation efficiency of the loop heat pipe of the present invention. In this specification, it will not be represented by a diagram.

10‧‧‧loop heat pipe

11‧‧‧ evaporation chamber

12‧‧‧shell

121‧‧‧ Upper cover

122‧‧‧Receiving Box

123‧‧‧The first hole

124‧‧‧Second Hole

125‧‧‧ evaporation space

13‧‧‧ Wool

131‧‧‧channel

132‧‧‧passage

21‧‧‧Condensation

211‧‧‧Circulation channel

212‧‧‧Steam connection

213‧‧‧Liquid end

31‧‧‧steam tube

41‧‧‧fluid tube

51‧‧‧Working fluid

511‧‧‧ liquid bomb

100‧‧‧ cooling unit

10’‧‧‧loop heat pipe

11’‧‧‧ evaporation chamber

12’‧‧‧shell

122’‧‧‧ container

123’‧‧‧ the first hole

124’‧‧‧Second hole

125’‧‧‧ evaporation space

21’‧‧‧Condensation

211’‧‧‧Circulation channel

212’‧‧‧Steam connection

213’‧‧‧Liquid end

31’‧‧‧ steam tube

41’‧‧‧fluid tube

511’‧‧‧ liquid bomb

100’‧‧‧ cooling unit

10 ”‧‧‧loop heat pipe

11 ”‧‧‧ evaporation chamber

122 "‧‧‧Receiving Box

123 "‧‧‧The first hole

124 "‧‧‧Second Hole

21 ”‧‧‧Condensation

211 "‧‧‧Circulation channel

212 "‧‧‧Steam connection

213 ”‧‧‧Liquid junction

31 ”‧‧‧steam tube

41 "‧‧‧fluid tube

511 "‧‧‧ liquid bomb

FIG. 1 is a perspective view of a first preferred embodiment of the present invention. Figure 2 is an exploded perspective view of Figure 1. FIG. 3 is a schematic cross-sectional view of the horizontal plane of FIG. 1 and a schematic cross-sectional view of a heat dissipation unit. Fig. 4 is a perspective view of a second preferred embodiment of the present invention. FIG. 5 is a horizontal cross-sectional view of FIG. 4 and a cross-sectional view of a heat dissipation unit. Fig. 6 is a perspective view of a third preferred embodiment of the present invention. Figure 7 is an exploded perspective view of Figure 6. FIG. 8 is a schematic horizontal sectional view of FIG. 6.

Claims (7)

A loop heat pipe with different pipe diameters includes: an evaporation cavity having a shell and a capillary material arranged in the shell; the capillary material does not occupy the inside of the shell and forms a space between the shell and the shell; Evaporation space; a condensing part, which is provided with a heat dissipation unit on the outside, and has a flow passage inside, one end of the flow passage is set as a steam connection end, and the other end is set as a liquid connection end, the inner diameter of the steam connection end is larger than that The inner diameter of the liquid connection end; a vapor flow tube, one end of which is connected to the casing and communicates with the evaporation space, and the other end is connected to the vapor connection end of the condensing element and communicates with the circulation channel; It is connected to the body and communicates with the interior of the casing, and the other end is connected to the liquid junction of the condensing element and communicates with the circulation channel. The inner diameter of the liquid flow tube is smaller than the inner diameter of the steam flow tube. Loop heat pipes with different tube diameters according to item 1 of the scope of patent application, wherein: the shell is composed of an upper cover and a containing box, the capillary material is arranged in the containing box, and the upper cover covers the containing box A side wall is provided around the containing box, and a first hole and a second hole are provided on the side wall. The first hole, the second hole, and the evaporation space are located on the same side of the containing box. The aperture is larger than the aperture of the second hole, the first hole is in communication with the steam space, and is connected to the casing corresponding to one end of the steam tube, and the second hole is corresponding to the end of the liquid tube. Instead, connect the case. According to item 2 of the scope of patent application, loop heat pipes with different pipe diameters, in which the condensing member is a U-shaped elbow with a hollow interior, and the circulation channel is provided inside the elbow and penetrates the two ends of the elbow, and is bent The two ends of the tube form the steam connection end and the liquid connection end, respectively, and the inner diameter of the steam connection end is larger than the inner diameter of the liquid connection end. Loop heat pipes with different tube diameters according to item 1 of the scope of patent application, wherein: the shell is composed of an upper cover and a containing box, the capillary material is arranged in the containing box, and the upper cover covers the containing box A side wall is provided around the containing box, and a first hole and a second hole are provided on the side wall. The first hole and the evaporation space are located on the same side of the containing box, and the first hole and the second hole are located. On the different side of the containing box, the aperture of the first hole is larger than the aperture of the second hole, the first hole is in communication with the steam space, and one end of the steam flow tube is inserted to connect the casing, The second hole is corresponding to one end of the liquid flow tube, and is connected to the casing. According to the fourth scope of the patent application, loop heat pipes with different pipe diameters, in which the condensing member is a hollow pipe, and the circulation channel is provided in the hollow pipe and penetrates the two ends of the hollow pipe. The two ends respectively form the steam connection end and the liquid connection end, and the inner diameter of the steam connection end is larger than the inner diameter of the liquid connection end. Loop heat pipes with different pipe diameters according to item 2 of the scope of patent application, where the condensing member is a rectangular block with a pipe inside to form the circulation channel, and the two ends of the pipe form the steam connection ends The inner diameter of the steam connection end is larger than the inner diameter of the liquid connection end. The loop heat pipes with different pipe diameters according to item 1 of the scope of patent application, wherein the capillary material is a sintered copper powder structure and has a plurality of channels, and the channel ports of each channel communicate with the steam space.