TW202045885A - Heat pipe manufacturing method with adjustable working temperature range - Google Patents

Abstract

The invention is a heat pipe manufacturing method and structure with adjustable working temperature range. The heat pipe includes a tube, capillary and working fluid. The tube has a hollow passage, and the hollow passage has a length direction and a diameter direction. A part of the tube has a deformation zone in the diameter direction, and the cross-sectional area of the deformation zone in the diameter direction is reduced relative to the original cross-sectional area before pressing, so that the deformation zone has a high fluid resistance. Thereby, the heat pipe is operated under a certain working temperature range so as to reach the working efficiency.

Description

Manufacturing method and structure of heat pipe with adjustable working temperature range

The present invention relates to a heat pipe, in particular to a manufacturing method and structure of a heat pipe with adjustable operating temperature range.

The working principle of the heat pipe is to provide the working fluid injected into it through the internal vacuum environment to undergo phase change after being heated to exchange heat, and then the working fluid will return to liquid after being cold and can be recycled and reused The implementation is to attach the evaporating end face of the heat pipe to the surface of the electronic heating element, so that the heat generated by the electronic element is absorbed by the evaporating end face of the heat pipe, and then transferred to the condensing end through the heat pipe to achieve the effect of heat dissipation.

Furthermore, in order to achieve good heat dissipation efficiency, the existing heat pipe has a very small temperature difference between the evaporating end and the condensing end, and the heat energy of the work piece is exchanged through the phase change of the working fluid, thereby preventing the work piece from overheating. Damage or deterioration of system efficiency. However, in a special use environment (such as an extremely cold environment), the electronic components cannot reach the proper operating temperature smoothly due to the small temperature difference, and the electronic components cannot exert the maximum working performance.

In this regard, how to make the heat pipe not operate when the ambient temperature is low and the heating temperature of the electronic components is low, and only start to operate when the heating temperature of the electronic components is high, so as to achieve the purpose of running the heat pipe at a certain temperature, which is the present invention Human research goals.

An object of the present invention is to provide a heat pipe manufacturing method with adjustable working temperature range, so that the heat pipe can operate in a certain working temperature range, and the work object can achieve working efficiency.

In order to achieve the above objective, the present invention is a method for manufacturing a heat pipe with adjustable operating temperature range, including: a. Providing a heat pipe for attaching a work object for heat exchange. The heat pipe includes a pipe body and is arranged on the pipe. A capillary tissue on the inner wall surface of the body and a working fluid arranged in the tube body. The tube body has a hollow channel. The hollow channel has a length direction and a tube diameter direction perpendicular to the length direction. The working fluid absorbs The heat energy of the work piece is converted into the vapor phase, and it undergoes condensation reaction along the length direction through the hollow channel and then condenses back to the working fluid, and moves through the capillary tissue to the place where the heat pipe attaches the work piece to absorb the work piece The thermal energy; b. Use a processing method to uniformly compress a part of the tube in the tube diameter direction to form a deformed area, the cross-sectional area of the deformed region in the tube diameter direction is relative to the original cross-sectional area before pressing The area is reduced by a reduction ratio so that the deformation area has a higher fluid resistance. The reduction ratio of the cross-sectional area of the deformation area in the tube diameter direction is determined by the following methods: c. Set the heat pipe to an ambient temperature Under the interval, the work can be heat exchanged, and the operating temperature of the work can be in a target operating temperature range; d. Provide a test room with the work and the heat pipe attached to the work, and Control the temperature of the test chamber within the ambient temperature range; e. Make the work object operate in the test room in the environmental temperature range, and measure an actual temperature range of the work object during operation; and f. Reduce The cross-sectional area of the hollow channel in the pipe diameter direction reaches the reduction ratio, so that the actual temperature range falls within the target operating temperature range.

An object of the present invention is to provide a heat pipe structure with adjustable operating temperature range, comprising a tube body, capillary tissue arranged on the inner wall surface of the tube body, and working fluid arranged in the tube body. The tube body has a hollow channel. The pipe diameter has a length direction and a vertical length direction. The working fluid absorbs the heat energy of the working object and converts it into a vapor phase. It also undergoes condensation reaction along the length through the hollow channel and then condenses back to the working fluid, and moves to the working fluid through the capillary tissue. The heat pipe is attached to the work object to absorb the heat energy of the work object. The part of the pipe body has a deformation area in the pipe diameter direction. The cross-sectional area of the deformation area in the pipe diameter direction is reduced by a reduction ratio relative to the original cross-sectional area before pressing. The deformation area has higher fluid resistance.

Compared with the prior art, the tube body of the heat pipe of the present invention is partially uniformly pressed in the tube diameter direction to form a deformation zone. In a low temperature environment, the vapor flow resistance between the evaporation end and the condensation end is high, and the temperature difference is therefore Increase, so that the heat pipe can run efficiently under a certain working temperature range, so that the work object can be raised to an appropriate working temperature to be able to exert its working efficiency; also, when the heat pipe is in a high-temperature environment, its working fluid will have a high-temperature vapor volume When it becomes larger, the internal pressure of the heat pipe can be increased and the working gas can be quickly pushed from the evaporating end to the condensing end, thereby increasing the heat transfer efficiency, so that the evaporating end and the condensing end have a smaller temperature difference; Operate in the working temperature range, and make the work object reach the working efficiency, and can avoid the work object from overheating and damage or causing the system performance efficiency to deteriorate.

The detailed description and technical content of the present invention are described as follows in conjunction with the drawings. However, the drawings are only provided for reference and explanation, and are not intended to limit the present invention.

Please refer to FIGS. 1 to 3, which are respectively a three-dimensional appearance diagram and a cross-sectional view of the heat pipe structure with adjustable operating temperature range of the present invention. The present invention is a heat pipe 1 with an adjustable operating temperature range, which includes a tube body 10, a capillary tissue 20 arranged on the inner wall surface of the tube body 10, and a working fluid 30 arranged in the tube body 10; The heat pipe 1 is used for attaching a work object (not shown) for heat exchange. The structure of the heat pipe 1 and its manufacturing method are described in more detail below.

In this embodiment, the manufacturing method of the heat pipe 1 includes: a. Providing a heat pipe 1, the heat pipe 1 comprising a pipe body 10, a capillary tissue 20 arranged on the inner wall of the pipe body 10 and arranged on the pipe body 10 in a working fluid 30. The tube body 10 has a hollow channel 100, and the hollow channel 100 has a length direction 101 and a tube diameter direction 102 perpendicular to the length direction 101. In addition, the working fluid 30 absorbs the heat energy of the working object and converts it into a vapor phase. It undergoes condensation reaction along the length direction 101 through the hollow channel 100 and then condenses back to the working fluid 30, and moves to the working fluid 30 through the capillary tissue 20. The heat pipe 1 is attached to the work object to absorb the heat energy of the work object.

Specifically, the tube body 10 includes the deformed region 11 and a first section 12 and a second section 13 located on opposite sides of the deformed region 11; preferably, the length of the deformed region 11 is smaller than the length of the first section 13 The length of a section 12 and the second section 13. It should be noted that the length of the deformation zone 11 is not limited, and it only needs to reach the resistance of the gas when passing through the deformation zone 11.

Furthermore, the manufacturing method of the heat pipe 1 further includes: b. Using a processing method to uniformly press a part of the pipe body 10 in the pipe diameter direction 102 to form a deformed area 11. In addition, the cross-sectional area A'of the deformed region 11 in the pipe diameter direction 102 after compression is reduced by a reduction ratio P relative to the original cross-sectional area A before compression. Thereby, the deformed region 11 can have a higher fluid resistance; wherein, the reduction ratio P of the cross-sectional area of the deformed region 11 in the pipe diameter direction 102 is determined by the following method.

Further, the manufacturing method further includes: c. Setting the heat pipe 10 to be able to perform heat exchange on the work object in an ambient temperature range, and enable the operating temperature of the work object to be in a target operating temperature range.

Subsequent, the manufacturing method includes: d. Provide a test chamber, place the work object and the heat pipe 1 attached to the work object, and control the temperature of the test chamber within the ambient temperature range. In addition, the manufacturing method includes: e. Make the work object operate in the ambient temperature range of the test chamber, and measure an actual temperature range of the work object during operation. Finally, the manufacturing method includes: f. reducing the cross-sectional area of the hollow channel 100 in the tube diameter direction 102 to the reduction ratio P, so that the actual temperature range falls within the target operating temperature range.

In actual use, the reduction ratio P can be set to 25% to 75%; in addition, the reduction ratio P is adjusted according to the actual temperature range of the work object during operation, for example, when the reduction ratio P is set to 75% , Its meaning is that the cross-sectional area A'after pressing is only 25% of the original cross-sectional area A.

In more detail, the ambient temperature range includes a high ambient temperature and a low ambient temperature; in addition, in the e step, the actual temperature range includes a high actual temperature and a low actual temperature. Furthermore, the high actual temperature is the operating temperature of the work object when the test room is operating at the high ambient temperature, and the low actual temperature is the operating temperature of the work object when the test room is operating at the low ambient temperature . It should be noted that the working temperature of the work object is measured when operating under a normal load.

For example, in the present invention, when the heat pipe 1 is used at a low ambient temperature, the original cross-sectional area of the tube body 10 of the heat pipe 1 is set to 0.015 cm², and the temperature between the evaporating end and the condensing end The difference is very small at 2.27°C; then, a part of the pipe body 10 is uniformly pressed in the pipe diameter direction 102 to form a deformed area 11, and the cross-sectional area of the deformed area 11 in the pipe diameter direction 102 is relative to the original before pressing. The cross-sectional area A is reduced by 25%, 50% and 75% respectively. Therefore, the compressed cross-sectional area will account for 75%, 50% and 25% of the original cross-sectional area and become 0.012 cm², 0.008 cm² and 0.004 Square centimeters. In addition, the temperature difference between the evaporating end and the condensing end will increase to 3.03°C, 4.55°C and 9.10°C, respectively.

It can be seen from the above example that the tube body 10 of the heat pipe 1 is partially uniformly compressed in the tube diameter direction 102 to form a deformed area 11, such as the reduction ratio of 75% (that is, the cross-sectional area A'occupies the original cross-sectional area A after compression 25%), the temperature difference between the evaporating end and the condensing end will increase to 9.10℃. At this time, when the heat pipe 1 is attached to a work object to perform heat exchange, the heat dissipation efficiency of the heat pipe 1 is reduced because the temperature difference between the evaporation end and the condensation end of the heat pipe 1 increases. Therefore, the heat pipe 1 will only start heat exchange after the work object reaches a certain temperature, so that the heat pipe 1 is operated in a certain working temperature range, so that the work object can be raised to a proper working temperature to be able to perform its work performance.

Furthermore, please refer to the following table, which shows the experimental data obtained by the heat pipe manufacturing method described above. H (mm) TL (℃) TH (℃) ΔT (℃) 2.0 23.9 78.7 54.8 0.7 30.6 78.7 48.1 0.4 37.6 80.5 42.9

The above table can be checked in conjunction with Figure 3. The height of the heat pipe 1 is 2mm before the heat pipe is pressed. Moreover, before the heat pipe 1 is pressed, when the heat pipe 1 is operating at a low ambient temperature of 0°C, its work (Such as a processor) measured temperature (low actual temperature TL) is 23.9 ℃; in addition, when the heat pipe 1 is operating at a high ambient temperature of 70 ℃, the surface of the working object (such as the processor) The measured temperature (high actual temperature TH) is 78.7°C. According to this, the temperature difference ΔT between the low actual temperature TL and the high actual temperature TH of the work object is 54.8°C.

Furthermore, when the heat pipe 1 is uniformly pressed and the heat pipe height H is reduced to 0.7 mm (about one third of the original height), the temperature difference ΔT between the low actual temperature TL and the high actual temperature TH of the work object is 48.1°C. Similarly, when the heat pipe 1 is uniformly pressed to reduce the heat pipe height H to 0.4mm (approximately one-fifth of the original height), the temperature difference ΔT between the low actual temperature TL and the high actual temperature TH of the work object is 42.9°C.

It can be known from the above experimental data that the internal space of the heat pipe 1 of the present invention after being uniformly pressed becomes smaller. In this case, the low actual temperature TL and the high actual temperature TH of the heat pipe 1 will both increase. In addition, the increase of the low actual temperature TL can make the work piece reach a certain temperature before the heat exchange starts. In addition, the temperature difference ΔT when the heat pipe 1 operates under high ambient temperature and low ambient temperature is reduced.

It is worth noting that, in the present invention, when the heat pipe 1 is in a high-temperature environment, it uses the phase change principle of the working fluid to use the characteristic of high-temperature gas with a relatively large volume to increase the internal pressure of the heat pipe 1 to reduce The working gas is quickly pushed from the evaporating end to the condensing end, thereby improving the heat transfer efficiency, so that the evaporating end and the condensing end have a smaller temperature difference value, thereby avoiding the damage of the working object or the deterioration of system efficiency.

In addition, it should be noted that after the heat pipe 1 of the present invention has been through the aforementioned methods and multiple tests, when the user sets the target operating temperature range, the reduction ratio P can be calculated through a computer program to increase the cost. The utility of the invention.

The foregoing descriptions are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Other equivalent changes using the patent spirit of the present invention should all belong to the patent scope of the present invention.

1: Heat pipe

10: Tube body

100: Hollow channel

101: length direction

102: pipe diameter direction

11: Deformation area

12: The first section

13: Second section

20: Capillary tissue

30: working fluid

A: Original cross-sectional area

A’: Cross-sectional area after pressing

P: Reduction ratio

H: height

TL: Low actual temperature

TH: High actual temperature

ΔT: temperature difference

Figure 1 is a schematic diagram of the three-dimensional appearance of the heat pipe with adjustable operating temperature range of the present invention;

2 and 3 are cross-sectional views in two directions of the heat pipe with adjustable operating temperature range of the present invention.

1: Heat pipe

10: Tube body

100: Hollow channel

101: length direction

11: Deformation area

12: The first section

13: Second section

20: Capillary tissue

30: working fluid

Claims (10)

A heat pipe manufacturing method with adjustable operating temperature range, including: a. Provide a heat pipe for attaching a work object for heat exchange. The heat pipe includes a pipe body, a capillary structure arranged on the inner wall surface of the pipe body, and a working fluid arranged in the pipe body. The pipe The body has a hollow channel, the hollow channel has a length direction and a tube diameter direction perpendicular to the length direction, the working fluid absorbs the heat energy of the working object and then converts it into a vapor phase, and then proceeds along the length direction through the hollow channel After the condensation reaction, it condenses back to the working liquid, and moves through the capillary tissue to the place where the heat pipe is attached to the working object to absorb the heat energy of the working object; b. Use a processing method to uniformly press a part of the tube in the tube diameter direction to form a deformed area, and the cross-sectional area of the deformed area in the tube diameter direction is reduced by one relative to the original cross-sectional area before pressing The reduction ratio makes the deformation zone have higher fluid resistance, wherein the reduction ratio of the cross-sectional area of the deformation zone in the pipe diameter direction is determined by the following method; c. Set the heat pipe system to be able to perform heat exchange on the work object in an ambient temperature range, and enable the operating temperature of the work object to be in a target operating temperature range; d. Provide a test room with the work object and the heat pipe attached to the work object, and control the temperature of the test room within the ambient temperature range; e. Make the work object operate in the ambient temperature range of the test room, and measure an actual temperature range of the work object during operation; and f. Reduce the cross-sectional area of the hollow channel in the pipe diameter direction to the reduction ratio, so that the actual temperature range falls within the target operating temperature range. The method for manufacturing a heat pipe with an adjustable operating temperature range according to claim 1, wherein the tube body includes the deformed area and a first section and a second section located on opposite sides of the deformed area. The length is smaller than the length of the first section and the second section. The method for manufacturing a heat pipe with an adjustable operating temperature range according to claim 1, wherein in step c, the ambient temperature range includes a high ambient temperature and a low ambient temperature; in step e, the actual temperature range includes a high actual temperature And a low actual temperature. The high actual temperature is the operating temperature of the work object when the test chamber is operating at the high ambient temperature, and the low actual temperature is the work object when the test chamber is operating at the low ambient temperature Working temperature. The method for manufacturing a heat pipe with an adjustable operating temperature range according to claim 1, wherein in step e, the operating temperature of the work object is measured when operating under a normal load. The heat pipe manufacturing method with adjustable operating temperature range as described in claim 1, wherein the reduction ratio is 25% to 75%. The heat pipe manufacturing method with adjustable operating temperature range as described in claim 5, wherein the reduction ratio is 75%. A heat pipe structure with adjustable working temperature range, comprising a pipe body, a capillary tissue arranged on the inner wall surface of the pipe body, and a working fluid arranged in the pipe body. The pipe body has a hollow channel and the hollow channel Having a length direction and a pipe diameter direction perpendicular to the length direction, the working fluid absorbs the heat energy of the working object and then converts it into a vapor phase, and then condenses back to the working fluid after undergoing condensation reaction along the length direction through the hollow channel, The capillary tissue moves to the place where the heat pipe is attached to the work object to absorb the heat energy of the work object, wherein a part of the pipe body has a deformation area in the pipe diameter direction, and the deformation area is in the pipe diameter direction. The cross-sectional area is reduced by a reduction ratio relative to the original cross-sectional area before pressing, so that the deformed area has a higher fluid resistance. The heat pipe structure with adjustable operating temperature range according to claim 7, wherein the tube body includes a first section and a second section located on opposite sides of the deformation area, and the length of the deformation area is smaller than the first section. Section and the second section. The heat pipe structure with adjustable operating temperature range as described in claim 7, wherein the reduction ratio is 25% to 75%. The heat pipe structure with adjustable operating temperature range as described in claim 9, wherein the reduction ratio is 75%.

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