TWI766681B - Heat pipe structure - Google Patents

Abstract

A heat pipe structure includes a tubular body. The tubular body has a first end and a second end and an airtight chamber. At least one capillary structure layer is disposed on a wall face of the tubular body. A working fluid is filled in the airtight chamber. Any of the first and second ends of the tubular body is such arranged as to be normal to a horizontal face. The first and second ends are respectively positioned at upper and lower ends of the tubular body. One end of the tubular body in contact with the horizontal face has a bulged space as an ice molecule releasing space after the working fluid is frozen.

Description

Heat pipe structure

A heat pipe structure, especially a heat pipe structure with space for icing ice molecules to release force.

The traditional heat pipe system has a hollow shell (tube) body, and a capillary wick and working fluid (water, refrigerant, methanol, acetone, liquid ammonia, etc.) are arranged inside the shell (tube) body. ) body is currently mostly made of copper, aluminum and other materials on the market, because the internal working fluid of the hollow shell (tube) body undergoes a phase change latent heat mechanism for heat conduction.

However, currently used in the field of heat dissipation of electronic products are heat pipes made of copper material plus water (Copper tube+Pure Water). It is used in normal environment; but it will still be subject to application conditions, such as outdoor (5G, 6G base station, outdoor photovoltaic power source IGBT heat dissipation, automotive or any outdoor application that requires heat dissipation), when the working liquid is at an ambient temperature of 0 degrees The resulting icing problem and the influence of icing molecular force on the structural strength are limited.

When the heat pipe is installed horizontally, the working fluid will freeze, and the ice molecules will expand and squeeze the heat pipe wall, causing the heat pipe to deform. In addition, if the heat pipe is installed in an upright manner, the working fluid will be affected by gravity. The influence gathers at the bottom of the lower end of the heat pipe, and when the working environment is lower than 0 degrees, the working liquid inside the heat pipe freezes, and the ice molecules will expand to expand the wall of the heat pipe. Loss of vacuum and leakage of working fluid.

Therefore, how to properly prevent the internal working liquid from freezing at low temperature, thereby destroying the gas-liquid circulation inside the heat pipe is the first and foremost goal of those who are familiar with the art.

Therefore, in order to effectively solve the above problems, the main purpose of the present invention is to provide a solution to solve the problem that when the vertical arrangement of the heat pipe is affected by (gravity), since the working liquid filled in the heat pipe will freeze at zero degrees, the molecules of the ice in the lowermost part will freeze. The release force will cause the bottom of the tube to expand, thereby adding a heat pipe structure in which the ice molecule releases the force space.

In order to achieve the above object, the present invention provides a heat pipe structure, comprising: a pipe body; the pipe body has a first end and a second end and an airtight chamber, and the wall surface of the pipe body has at least one capillary structure layer and filled with a working fluid, any one of the first and second ends of the pipe body is arranged in a vertical manner with a horizontal plane, the first and second ends are respectively located at the upper and lower ends of the pipe body, the pipe body The lower end in contact with the horizontal plane has an expansion space as a release space for ice molecules after the working fluid freezes.

Since the heat pipe is placed vertically, the working fluid will be concentrated at the lower end of the heat pipe due to the influence of gravity, and the working liquid filled in the heat pipe will freeze when the working environment is below zero, and in the actual working scene, the environment The temperature varies from 40 to 100 degrees. When the internal working fluid freezes, due to the different physical densities of ice and water, the molecular release force of the ice at the bottom end of the most vertical direction (the lower end of the heat pipe) will cause the bottom of the heat pipe to bulge. Therefore, in the present invention, an expansion space for preventing the bulging of the heat pipe body is provided as the ice molecule releasing space after the working liquid freezes.

1: Tube body

11: First End

12: Second end

13: Airtight Chamber

14: Expansion space

2: capillary structure layer

3: Working fluid

Figure 1 is a perspective view of the first embodiment of the heat pipe structure of the present invention; Figure 2 is a cross-sectional view of the first embodiment of the heat pipe structure of the present invention.

The above-mentioned objects of the present invention and their structural and functional characteristics will be described with reference to the preferred embodiments of the accompanying drawings.

Please refer to Figures 1 and 2, which are three-dimensional and cross-sectional views of the first embodiment of the heat pipe structure of the present invention. As shown in the figures, the heat pipe structure of the present invention comprises: a pipe body 1; the pipe body 1 has a first The end 11, a second end 12 and an airtight chamber 13, the wall surface of the pipe body 1 has at least one capillary structure layer 2 and is filled with a working fluid 3, the working fluid 3 is water, refrigerant, methanol, acetone wherein Either, the capillary structure layer 2 can be sintered powder or groove or woven mesh or a combination thereof, and the tube body 1 is any one of a round tube, a flat tube, and a square tube, and the tube body 1 is made of It is any one of aluminum, copper, stainless steel and titanium, and any one of the first and second ends 11 and 12 of the pipe body 1 is arranged in a vertical manner with a horizontal plane, which means that the pipe body 1 is in an upright manner. The first and second ends 11 and 12 are located at the upper and lower ends of the pipe body 1 respectively, and one end of the pipe body 1 in contact with the horizontal plane has an expansion space 14 as the ice molecules after the working fluid 3 freezes Free up space.

The part of the pipe body 1 where the expansion space 14 is arranged has a larger volume ratio than other parts of the pipe body 1 , and the expansion space 14 is formed by the pipe wall of the pipe body protruding vertically upward to form a space for pipe expansion or the expansion space formed by the pipe body The tube wall horizontally protrudes to any of the left or right sides to form a space for expanding the tube.

The problem solved by the present invention is that when the heat pipe is used vertically and upright, the working fluid will gather at the lower end, and at the same time, when the ambient temperature is lower than 0 degrees, the working fluid at the lower end of the heat pipe will freeze and cause the heat pipe to freeze. The ice part expands and even bursts, so in this case, an expansion space is set at the lower end of the heat pipe when the heat pipe is used upright as a release space for the ice molecules after the working fluid freezes. Of course, it can also be located at both ends of the heat pipe. The expansion space is arranged at the bottom, or the expansion space is correspondingly arranged around the heat pipe according to the different use states.

1: Tube body

11: First End

12: Second end

13: Airtight Chamber

14: Expansion space

2: capillary structure layer

3: Working fluid

Claims (6)

A heat pipe structure comprises: a pipe body with a first end, a second end and an airtight chamber, the wall surface of the pipe body has at least one capillary structure layer and is filled with a working fluid, the first end of the pipe body is Either one of the first and second ends is arranged vertically to a horizontal plane, the first and second ends are respectively located at the upper and lower ends of the pipe body, and one end of the pipe body in contact with the horizontal plane has a bulge formed by protruding outward. The space is released as ice molecules after the working fluid freezes. According to the heat pipe structure described in the patent application item 1, the place where the tube body has the expansion space is the lower end, and its volume ratio is greater than that of other parts of the tube body. The heat pipe structure as described in the first patent application, wherein the expansion space is formed by the pipe wall of the pipe body protruding vertically upward to form the expansion space. The heat pipe structure as described in the first patent application, wherein the expansion space is formed by the horizontal protrusion of the pipe wall of the pipe body to any one of the left or right sides to form the expansion space. The heat pipe structure as described in the first patent application, wherein the material of the pipe body is any one of aluminum, copper, stainless steel, and titanium. The heat pipe structure as described in the first patent application, wherein the working fluid system is any one of water, refrigerant, methanol and acetone.

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