TWI525299B - Thin heat pipe structure and method of forming same - Google Patents

Description

Thin heat pipe structure and forming method thereof

The invention relates to a thin heat pipe structure and a molding method thereof, in particular to a thin heat pipe structure and a molding method thereof, which have the advantages of reducing the pressure resistance and thereby effectively improving the vapor-liquid circulation efficiency.

The heat pipe is excellent in the apparent thermal conductivity of several times to several tens of times of a metal such as copper or aluminum. Therefore, it is used as a cooling element in various heat countermeasure related devices. From the shape point of view, the heat pipe can be divided into a heat pipe in the shape of a circular pipe and a heat pipe in a planar shape. In order to cool a cooled component of an electronic device such as a CPU, it is preferable to use a planar heat pipe for heat dissipation from the viewpoint of easy attachment to a member to be cooled and a wide contact area. With the miniaturization and space saving of the cooling mechanism, in the case of a cooling mechanism using a heat pipe, it is necessary to strictly reduce the thickness of the heat pipe, and a thin heat pipe (i.e., a flat heat pipe) has been developed.

However, the conventional thin heat pipe has a space inside as a working fluid flow path, and is accommodated in the working fluid in the space, and then transfers heat through phase change and movement of evaporation, condensation, etc., thereby achieving heat conduction. effect.

The thin heat pipe is manufactured by filling a hollow pipe body with metal powder, and the metal powder is sintered to form a capillary structure layer on the inner wall of the hollow pipe, and then the hollow pipe body is formed. Vacuuming and filling the working fluid, and finally sealing and flattening to achieve a thin heat pipe structure.

Although it is known that a thin heat pipe can achieve the purpose of thinning, it extends another problem because the diameters of the evaporation end and the condensation end of the thin heat pipe are the same. The size of the space in the evaporation end and the condensation end is also the same, so that the space pressure difference between the evaporation end and the condensation end is almost the same, so that the vapor working fluid in the evaporation end cannot flow to the condensation end and condense rapidly. Conversion to a liquid working fluid, which in turn affects the rate at which the liquid working fluid is returned to the evaporation end by the capillary structure, so that the overall vapor-liquid circulation effect is poor, and the evaporation end and the condensation end of the thin heat pipe cannot be improved. Pressure impedance problem between.

Further, when the thin heat pipe is bent in the production, the inner capillary sintered body is liable to be embrittled and decomposed or deviated from the originally disposed portion, which is a defective product, so that the heat transfer efficiency of the thin heat pipe is greatly reduced. As described above, the prior art has the following disadvantages: 1. The vapor-liquid circulation efficiency is poor; 2. The heat conduction effect is poor; 3. The pressure resistance between the evaporation end and the condensation end of the thin heat pipe cannot be improved.

Therefore, how to solve the above problems and problems in the past, that is, the inventors of this case and the relevant manufacturers engaged in this industry are eager to study the direction of improvement.

Accordingly, in order to effectively solve the above problems, the main object of the present invention is to provide a thin heat pipe structure having an improved vapor-liquid circulation and a reduced pressure resistance.

A secondary object of the present invention is to provide a thin heat pipe structure having an excellent heat conduction effect.

A secondary object of the present invention is to provide a thin heat pipe structure forming method having an improved vapor-liquid circulation and a reduced pressure resistance.

A secondary object of the present invention is to provide a thin heat pipe structure forming method having excellent heat conduction effect.

In order to achieve the above object, the present invention provides a thin heat pipe structure comprising a pipe body and at least one capillary structure, the pipe body having an evaporation end and a condensation end extending outward from the evaporation end, the evaporation end and condensation a first chamber and a second chamber communicating with the first chamber are respectively disposed in the end, and a cross-sectional area of the evaporation end of the tube is smaller than a cross-sectional area of the condensation end of the tube, and the space of the first chamber Smaller than the space of the second chamber, the capillary structure is disposed in the first and second chambers, and defines at least one channel together with the first and second chambers; the second chamber that passes through the condensation end is larger than The first chamber of the evaporation end is effective to prompt the vapor working fluid in the evaporation end to flow to the condensation end quickly, thereby achieving the effect of improving the vapor-liquid circulation effect, thereby further reducing the pressure resistance.

The invention further provides a thin heat pipe structure forming method, firstly providing a pipe body having a first chamber and a second chamber and at least one capillary structure, wherein the pipe body has a first chamber in an evaporation end The space is smaller than the space of the second chamber in a condensation end of the pipe body, and the cross-sectional area of the evaporation end of the pipe body is smaller than the cross-sectional area of the condensation end of the pipe body, and the capillary structure is provided with a first side and a Conversely, the second side of the first side, a third side and a fourth side opposite to the third side, and the capillary structure is placed in the first and second chambers, the capillary structure and the first The two chambers jointly define a first passage and a second passage, and one end of the tubular body to the tubular body The other end is mechanically processed, and the first and second chambers are jointly provided with a first side wall, a second side wall opposite to the second side, a third side wall opposite to the third side, and a corresponding side a fourth side wall of the fourth side, the first side wall of the first chamber is attached to the corresponding first side, and the first side wall of the second chamber of the condensation end is defined with respect to the first side of the capillary structure a gap connecting the first and second passages, and then closing both ends of the tubular body, and simultaneously extracting a vacuum and filling the working fluid; by the design of the method of the invention, the raft is effectively raised to enhance the steam Liquid circulation effect and effect of reducing pressure resistance.

The invention further provides a thin heat pipe structure forming method, firstly providing a pipe body having a first chamber and a second chamber and at least one capillary structure, wherein the pipe body has a first chamber in an evaporation end The space is smaller than the space of the second chamber in a condensation end of the pipe body, and the cross-sectional area of the evaporation end of the pipe body is smaller than the cross-sectional area of the condensation end of the pipe body, and the capillary structure is provided with a first side and a a second side of the first side, a third side, and a fourth side opposite the third side, and the capillary structure is placed in the first and second chambers, and the capillary structure is first and second The chambers jointly define a first passage and a second passage, and then close the two ends of the tubular body, simultaneously extract vacuum and fill the working fluid, and finally apply mechanical processing to the closed tubular body, and the mechanical processing operation The first and second chambers are jointly provided with a first side wall, a second side wall opposite to the second side, a third side wall opposite to the third side, and a fourth side wall opposite to the fourth side. The first side wall of the first chamber is attached to the corresponding first The upper side, a first side wall of the condensing end of the second chamber opposite the first side between the capillary structure defining a void, which empty The gap system communicates with the first and second channels; therefore, through the design of the method of the present invention, the effect of improving the vapor-liquid circulation effect and reducing the pressure resistance is effectively achieved.

The above object of the present invention, as well as its structural and functional features, will be described in accordance with the preferred embodiments of the drawings.

The present invention relates to a thin heat pipe structure and a molding method thereof. Please refer to FIGS. 1, 2 and 4 for a combination and a partial cross-sectional view of a preferred embodiment of the present invention; the thin heat pipe structure 1 includes a pipe body 10 And at least one capillary structure 12, wherein the tube body 10 has an evaporation end 101 and a condensation end 102 extending outward from the evaporation end 101. The cross-sectional area of the evaporation end 101 of the tube body 10 is smaller than the condensation of the tube body 10. a first chamber 1011 and a second chamber 1021 are respectively disposed in the evaporation end 101 and the condensation end 102. The first chamber 1011 is connected to the second chamber 1021 and has a smaller space. The space of the second chamber 1021 and the first and second chambers 1011, 1021 are filled with a working fluid. The working fluid is illustrated by pure water in the preferred embodiment, but is not limited thereto. In the specific implementation, any fluid that can also facilitate evaporation and heat dissipation is an inorganic compound, an alcohol, a ketone, a liquid metal, a cold coal, an organic compound or a mixture thereof, which is the working fluid described.

The first and second chambers 1011 and 1021 are provided with a first side wall 1031, a second side wall 1032, a third side wall 1033 and a fourth side wall 1034. The first side wall 1031 is opposite to the second side wall 1032. The third sidewall 1033 is opposite to the fourth sidewall 1034.

Furthermore, the evaporation end 101 is attached to a heating element (such as a central processing unit, a drawing chip, a north-south bridge chip, an execution unit, etc.; not shown) for absorbing the heat source generated by the heating element. The liquid working fluid of the first chamber 1011 of the evaporation end 101 absorbs the heat source to generate evaporation to be converted into a vapor working fluid, and the vapor working fluid is cooled to the second chamber 1021 of the condensation end 102 to be condensed and converted into After the liquid working fluid, the liquid working fluid is returned to the first chamber 1011 of the evaporation end 101 by the capillary force of the gravity or capillary structure 12 to continue the vapor-liquid circulation, so as to effectively achieve an excellent heat dissipation effect.

Therefore, the second chamber 1021 passing through the condensation end 102 is larger than the first chamber 1011 of the evaporation end 101, thereby reducing the pressure resistance in the second chamber 1021 of the condensation end 102, and allowing the first chamber of the evaporation end 101. The vaporous working fluid converted in 1011 is subjected to a small pressure impedance and can rapidly flow to the second chamber 1021 of the condensation end 102, and can relatively quickly drive the liquid in the second chamber 1021 of the condensation end 102. The working fluid is returned to the first chamber 1011 of the evaporation end 101 to effectively increase the vapor-liquid circulation and achieve the effect of reducing the pressure resistance.

In addition, in the actual implementation of the present invention, the condensing end 102 can be disposed or attached to an opposite heat dissipating fin group (not shown), and the heat dissipating fin group can quickly heat the condensing end 102 to the outside. The heat dissipation is effective to accelerate the condensation of the vapor working fluid at the condensation end 102 into a liquid working fluid.

Referring to Figures 3 and 4, with reference to Figure 2, the capillary structure 12 is selected from the group consisting of mesh, fiber, sintered powder, mesh and sintered powder. And any of the capillary structures 12 are disposed in the first and second chambers 1011, 1021, and have the function of guiding current, providing more return channels and support, and the capillary structure 12 Cooperating with the first and second chambers 1011, 1021 to define at least one channel 105, wherein the preferred embodiment of the capillary structure 12 is disposed at the center of the first and second chambers 1011, 1021, and the first The two chambers 1011 and 1021 respectively define two channels 105 for description; that is, the capillary structure 12 is provided with a first side 121, a second side 122 opposite to the first side 121, a third side 123 and a On the other hand, the fourth side 124 of the third side 123 is adjacent to the opposite second side wall 1032. The first side 1051 is defined between the third side 123 and the corresponding third side wall 1033. A second channel 1052 is defined between the fourth side 124 and the corresponding fourth side wall 1034, and the first side wall 1031 of the first chamber 1011 is attached to the corresponding first side 121. The second cavity The first sidewall 1031 in the chamber 1021 defines a gap 106 between the first side 121 and the first side 121. The gap 106 communicates with the first sidewall First and second channels 1051, 1052.

The spaces of the first and second channels 1051 and 1052 in the first chamber 1011 of the evaporation end 101 are smaller than the first and second channels 1051 and 1052 in the second chamber 1021 of the condensation end 102. The space of the first and second channels 1051 and 1052 in the second chamber 1021 is widened by the gap 106, thereby greatly reducing the pressure resistance in the second chamber 1021 of the condensation end 102, and is helpful. The vaporous working fluid in the first chamber 1011 of the evaporation end 101 is rapidly moved toward the second chamber 1021 to effectively achieve the effect of improving vapor-liquid circulation and excellent heat dissipation.

Furthermore, in the specific implementation, the capillary structure 12 is not limited to be disposed at the center of the first and second chambers 1011 and 1021, and may be disposed in the first and second chambers 1011 and 1021. The third side wall 1033 is disposed on the fourth side wall 1034 or at a position between the third side wall 1033 and the fourth side wall 1034. In addition, the user can pre-determine the width, conduction efficiency, and steam of the tube body 10. The requirement of the liquid circulation efficiency is to set the number of the capillary structure 12 and the channel 105. For example, the two capillary structure 12 is disposed in the first and second chambers 1011 and 1021, and defines three together with the first and second chambers 1011 and 1021. Channel 105, combined with Chen Ming.

Therefore, the second chamber 1021 of the condensation end 102 of the tube body 10 of the present invention is larger than the first chamber 1011 of the evaporation end 101, and is integrated with the capillary structure 12, so that the vapor-liquid circulation efficiency is effectively improved to achieve excellent performance. The heat dissipation effect can further reduce the pressure resistance.

Please refer to FIG. 5, which is a schematic flow chart showing the steps of the method for forming a thin heat pipe structure according to the present invention. Referring to FIG. 1 to FIG. 4 together, as shown in the figure, the method for forming a thin heat pipe structure of the present invention comprises the following steps:

(S1) providing a tube body having a first chamber and a second chamber and at least one capillary structure, and the tube body has a space of the first chamber in an evaporation end smaller than a tube body a space of the second chamber in the condensation end, and a cross-sectional area of the evaporation end of the tube body is smaller than a cross-sectional area of the condensation end of the tube body; a tube body 10 having a first chamber 1011 and a second chamber 1021 is provided and at least a capillary structure 12, and the evaporation end 101 of the tube body 10 has a space smaller than the condensation end of the first chamber 1011 The space of the second chamber 1021 is 102, and the cross-sectional area of the evaporation end 101 of the tube 10 is smaller than the cross-sectional area of the condensation end 102 of the tube 10; wherein the capillary structure 12 is selected as a mesh, a fiber, and a sintered powder. Any combination of mesh, mesh and sintered powder, and the capillary structure is provided with a first side 121, a second side 122 opposite the first side 121, a third side 123 and a fourth opposite the third side 123 Side 124.

(S2) placing the capillary structure into the first and second chambers, and the capillary structure and the first and second chambers together define a first passage and a second passage, and one end of the tubular body to the tube The other end of the body is machined, and the first and second chambers are jointly provided with a first side wall, a second side wall opposite to the second side, a third side wall opposite to the third side, and a relative a fourth side wall of the fourth side, the first side wall of the first chamber is attached to the corresponding first side, and the first side wall of the second chamber of the condensation end is opposite to the first side of the capillary structure Defining a gap that communicates with the first and second passages; placing the capillary structure 12 into the first and second chambers 1011, 1021, and the capillary structure 12 and the first and second chambers 1011, 1021 A first channel 1051 and a second channel 1052 are jointly defined, and one end of the tube body 10 (ie, the evaporation end 101) is mechanically processed (ie, the condensation end 102), such as stamping or rolling. And the first and second chambers 1011, 1021 are jointly provided with a first sidewall 1031, and a second opposite to the second 1,032,122 of the second side wall, a third side opposing the third sidewall 1,033,123 and a fourth side 124 opposite the The fourth side wall 1034 of the first chamber 1011 is attached to the corresponding first side 121, and the first side wall 1031 of the second chamber 1021 of the condensation end 102 is opposite to the capillary The first side 121 of the structure 12 defines a gap 106 that communicates with the first and second channels 1051, 1052.

(S3) closing both ends of the tube body, and simultaneously withdrawing the vacuum and filling the working fluid; closing both ends of the tube body 10 (ie, the evaporation end 101 and the condensation end 102), simultaneously extracting the vacuum, and A working fluid is filled into the first and second chambers 1011, 1021.

Therefore, the design of the method of the present invention is effective to reduce the pressure resistance in the second chamber 1021 of the condensation end 102, so as to effectively promote the vapor working fluid in the first chamber 1011 of the evaporation end 101 to rapidly move toward the first The two chambers 1021 flow in the direction, so that it is effective to reduce the pressure resistance and enhance the effect of the vapor-liquid circulation, thereby achieving an excellent heat dissipation effect.

Please refer to FIG. 6 , which is a schematic flow chart showing the steps of another thin heat pipe structure forming method of the present invention. Referring to FIG. 1 to FIG. 4 together, as shown in the figure, the thin heat pipe structure forming method of the present invention includes the following step:

(S1) providing a tube body having a first chamber and a second chamber and at least one capillary structure, and the tube body has a space of the first chamber in an evaporation end smaller than a tube body a space of the second chamber in the condensation end, and a cross-sectional area of the evaporation end of the tube body is smaller than a cross-sectional area of the condensation end of the tube body, and the capillary structure is provided with a first side and a second side opposite to the first side a third side and a fourth side opposite the third side a tube body 10 having a first chamber 1011 and a second chamber 1021 and at least one capillary structure 12, and the evaporation chamber 101 of the tube body 10 has a space smaller than the tube body of the first chamber 1011. The space of the second chamber 1021 of the condensation end 102 of the 10, and the cross-sectional area of the evaporation end 101 of the tube 10 is smaller than the cross-sectional area of the condensation end 102 of the tube 10; wherein the capillary structure 12 is selected as a mesh, Any combination of fibers, sintered powder, mesh, and sintered powder, and the capillary structure is provided with a first side 121, a second side 122 opposite the first side 121, a third side 123, and an opposite third side The fourth side 124 of 123.

(S2) placing the capillary structure into the first and second chambers, and the capillary structure and the first and second chambers together define a first passage and a second passage; and placing the capillary structure 12 into the first In the two chambers 1011, 1021, the capillary structure 12 and the first and second chambers 1011, 1021 jointly define a first channel 1051 and a second channel 1052.

(S3) closing both ends of the tube body, and simultaneously withdrawing the vacuum and filling the working fluid; closing both ends of the tube body 10 (ie, the evaporation end 101 and the condensation end 102), simultaneously extracting the vacuum, and A working fluid is filled into the first and second chambers 1011, 1021.

(S4) applying a machining operation to one end of the closed pipe body to the other end of the pipe body, and the first and second chambers are jointly provided with a first side wall and a second side opposite to the second side a side wall, a side opposite to the third side a third side wall and a fourth side wall opposite to the fourth side, the first side wall of the first chamber is attached to the corresponding first side, and the first side wall of the second chamber of the condensation end is opposite to the capillary The first side of the structure defines a gap that communicates with the first and second passages; and the end of the tube body 10 that has been closed and filled with a working fluid (ie, the evaporation end 101) to the other end (ie, condensation) The end 102) is subjected to a machining operation, such as stamping or rolling, and the first and second chambers 1011, 1021 are jointly provided with a first side wall 1031 and a second side wall opposite to the second side 122. The third side wall 1033 opposite to the third side 123 and the fourth side wall 1034 opposite to the fourth side 124, the first side wall 1031 in the first chamber 1011 is attached to the corresponding first side. The first side wall 1031 of the second chamber 1021 of the condensation end 102 defines a gap 106 between the first side 121 of the capillary structure 12, and the gap 106 communicates with the first and second channels 1051 and 1052.

Therefore, the design of the method of the present invention is effective to reduce the pressure resistance in the second chamber 1021 of the condensation end, so as to effectively urge the vapor working fluid in the first chamber 1011 of the evaporation end 101 to rapidly move toward the second The chamber 1021 flows in the direction, so that it is effective to reduce the pressure resistance and enhance the effect of the vapor-liquid circulation, thereby achieving an excellent heat dissipation effect. As described above, the present invention has the following advantages over the conventional ones: 1. It has improved vapor-liquid circulation efficiency; 2. Good heat conduction effect; 3. Has the effect of reducing pressure resistance.

The above description is only a preferred embodiment of the present invention, but the features of the present invention are not limited thereto, and any changes or modifications that can be easily conceived in the field of the present invention are known to those skilled in the art. It is intended to be included in the scope of the claims of the present invention below.

1‧‧‧Thin heat pipe structure

10‧‧‧ tube body

101‧‧‧Evaporation end

1011‧‧‧ first chamber

102‧‧‧condensing end

1021‧‧‧Second chamber

1031‧‧‧First side wall

1032‧‧‧second side wall

1033‧‧‧ third side wall

1034‧‧‧fourth sidewall

105‧‧‧ channel

1051‧‧‧First Passage

1052‧‧‧second channel

106‧‧‧ gap

12‧‧‧Capillary structure

121‧‧‧ first side

122‧‧‧ second side

123‧‧‧ third side

124‧‧‧ fourth side

1 is a perspective view of a preferred embodiment of the present invention; FIG. 2 is a partial cross-sectional perspective view of a preferred embodiment of the present invention; and FIG. 3 is a cross-sectional side view of a preferred embodiment of the present invention; 4 is a schematic plan view of a preferred embodiment of the present invention; FIG. 5 is a schematic flow chart of a preferred embodiment of the present invention; and FIG. 6 is a schematic flow chart of another preferred embodiment of the present invention.

1‧‧‧Thin heat pipe structure

101‧‧‧Evaporation end

1011‧‧‧ first chamber

102‧‧‧condensing end

1021‧‧‧Second chamber

1033‧‧‧ third side wall

1034‧‧‧fourth sidewall

105‧‧‧ channel

1051‧‧‧First Passage

1052‧‧‧second channel

12‧‧‧Capillary structure

123‧‧‧ third side

124‧‧‧ fourth side

Claims (9)

A thin heat pipe structure includes: a pipe body having an evaporation end and a condensation end extending outward from the evaporation end, wherein the evaporation end and the condensation end are respectively provided with a first chamber and a first connection a second chamber of the chamber, the first and second chambers are jointly provided with a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall is opposite to the second side wall, the first side The third side wall is opposite to the fourth side wall, and the first and second chambers are filled with a working fluid, and the cross-sectional area of the evaporation end of the tube body is smaller than the cross-sectional area of the condensation end of the tube body, and the space of the first chamber is smaller than a space of the second chamber; and at least one capillary structure disposed in the first and second chambers, and having a first side, a second side opposite to the first side, a third side, and a first side Conversely, on the fourth side of the third side, the second side is disposed opposite to the opposite second side wall, and the third side defines a first passage between the third side wall and the corresponding side a second passage is defined between the fourth side walls, and the first side wall of the first chamber is Disposed on a first side corresponding to the sidewall of the second cavity of the first chamber and the line between the opposing sides defining a first gap, the space-based communication with the first and second channels. The thin heat pipe structure of claim 1, wherein the space of the first and second passages in the first chamber is smaller than a space defined by the first and second passages and the gap in the second chamber. The thin heat pipe structure according to claim 1, wherein the capillary structure is selected from the group consisting of a mesh, a fiber, a sintered powder, a mesh, and a sintered powder. A thin heat pipe structure forming method includes: providing a pipe body having a first chamber and a second chamber and at least one capillary structure, and the pipe body has a space of the first chamber in an evaporation end a space smaller than a second chamber in a condensation end of the tube body, and a cross-sectional area of the evaporation end of the tube body is smaller than a cross-sectional area of the condensation end of the tube body, and the capillary structure is provided with a first side, and the opposite a second side of the first side, a third side and a fourth side opposite the third side; the capillary structure is placed in the first and second chambers, and the capillary structure is shared with the first and second chambers Defining a first passage and a second passage, and machining one end of the tubular body to the other end of the tubular body, and the first and second chambers are jointly provided with a first side wall, and a affixing is opposite to the a second side wall of the second side, a third side wall opposite to the third side, and a fourth side wall opposite to the fourth side, so that the first side wall of the first chamber is attached to the corresponding first side a first side wall of the second chamber of the condensation end opposite the first side of the capillary structure Defining a gap, the space-based communication with the first, second channel; and both ends of the tubular body is closed, while the vacuum evacuation and filling of the working fluid. The thin heat pipe structure forming method according to claim 4, wherein the capillary structure is selected from the group consisting of a mesh, a fiber, a sintered powder, a mesh, and a sintered powder. The method of forming a thin heat pipe structure according to claim 4, wherein the mechanical processing is rolling or stamping. A thin heat pipe structure forming method includes: providing a pipe body having a first chamber and a second chamber and at least one hair a fine structure, and the space of the first chamber in an evaporation end of the tube body is smaller than the space of the second chamber in a condensation end of the tube body, and the cross-sectional area of the evaporation end of the tube body is smaller than the tube a cross-sectional area of the condensation end of the body, and the capillary structure is provided with a first side, a second side opposite to the first side, a third side and a fourth side opposite the third side; the capillary structure is placed The first and second chambers, and the capillary structure and the first and second chambers together define a first passage and a second passage; the two ends of the tubular body are closed, and vacuum and filling working fluid are simultaneously extracted; Machining work is performed on one end of the closed pipe body to the other end of the pipe body, and the first and second chambers are jointly provided with a first side wall and a second side wall opposite to the second side, The first sidewall of the first chamber is attached to the corresponding first side, and the second sidewall of the third chamber is opposite to the fourth sidewall of the fourth side. a first sidewall defines a gap between the first side of the capillary structure, the gap system Through the first and second channels. The thin heat pipe structure forming method according to claim 7, wherein the capillary structure is selected from the group consisting of a mesh, a fiber, a sintered powder, a mesh, and a sintered powder. The method of forming a thin heat pipe structure according to claim 7, wherein the mechanical processing is rolling or stamping.