US20220364794A1 - Heat pipe structure - Google Patents
Heat pipe structure Download PDFInfo
- Publication number
- US20220364794A1 US20220364794A1 US17/317,901 US202117317901A US2022364794A1 US 20220364794 A1 US20220364794 A1 US 20220364794A1 US 202117317901 A US202117317901 A US 202117317901A US 2022364794 A1 US2022364794 A1 US 2022364794A1
- Authority
- US
- United States
- Prior art keywords
- tubular body
- heat pipe
- space
- pipe structure
- working fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000012530 fluid Substances 0.000 claims abstract description 25
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 239000002826 coolant Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 239000010936 titanium Substances 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 239000007788 liquid Substances 0.000 description 9
- 230000007613 environmental effect Effects 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/04—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/0233—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes the conduits having a particular shape, e.g. non-circular cross-section, annular
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
- F28F2265/14—Safety or protection arrangements; Arrangements for preventing malfunction for preventing damage by freezing, e.g. for accommodating volume expansion
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
- The present invention relates generally to a heat pipe structure, and more particularly to a heat pipe structure having an ice molecule force releasing space for a frozen working fluid.
- A conventional heat pipe has a hollow case (tube) body. A capillary wick is disposed in the case (tube) body. A working fluid (such as water, coolant, methanol, acetone and liquid ammonia) is filled in the case (tube) body. In the current market, the hollow case (tube) body is generally made of copper, aluminum or the like material. The working fluid in the hollow case (tube) body will change between different phases to release latent heat so as to transfer heat.
- The heat pipes currently applied to electronic products for dissipating heat are all made of copper tube with pure water therein. The copper has better heat conductivity and the working fluid has better latent heat so that such heat pipe meets the use requirements of most of normal environments. However, the application of the heat pipe is still limited by the application conditions, for example, outdoor heat dissipation application (such as 5G, 6G base station, outdoor photovoltaic power supply IGBT heat dissipation and vehicle heat dissipation). Also, the freezing problem of the working liquid in a zero-degree environment and the affection of the ice molecule force to the structural strength will limit the application of the heat pipe.
- When the heat pipe is horizontally arranged and the working fluid is frozen, the ice molecules will expand to pressurize and expand the tube wall of the heat pipe. This will lead to deformation of the heat pipe. On the other hand, in the case that the heat pipe is vertically arranged, the working liquid will accumulate on the bottom of the lower end of the heat pipe due to gravity. When the environmental temperature is lower than zero degree, the working liquid in the heat pipe will freeze and the ice molecules will expand to expand the wall face of the heat pipe. In some more serious situations, the heat pipe will be expanded and broken to lose the vacuum state and leas to leakage of the working fluid.
- It is therefore tried by the applicant to provide a heat pipe structure having an ice molecule force releasing space for a frozen working fluid so as to solve the above problem of the conventional heat pipe that the working liquid in the heat pipe will freeze at low temperature to destroy the vapor-liquid circulation in the heat pipe.
- It is therefore a primary object of the present invention to provide a heat pipe structure having an ice molecule force releasing space for a frozen working fluid. In the case that the heat pipe is vertically arranged, the working liquid will accumulate on the bottom of the lower end of the heat pipe due to gravity. The working liquid filled in the heat pipe will freeze at zero degree. At this time, the releasing force of the ice molecules of the frozen working liquid on the lowermost portion of the heat pipe will expand the bottommost portion of the tube body. In this situation, the ice molecule force releasing space of the heat pipe provides a space for the frozen working fluid so as to prevent the heat pipe from breaking.
- To achieve the above and other objects, the heat pipe structure of the present invention 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.
- In the case that the heat pipe is vertically arranged, the working fluid will accumulate at the lower end of the heat pipe due to gravity. The environmental temperature of the actual working site ranges from 40˜100 degrees. When the environmental temperature is lower than zero degree, the working liquid filled in the heat pipe will freeze. The water and ice have different physical densities so that the molecule releasing force of the ice at the lower end (or the heat pipe) in the vertical direction will expand the tube wall of the bottommost portion of the heat pipe. The heat pipe structure of the present invention is formed with the bulged space as an ice molecule releasing space after the working fluid is frozen so as to prevent the tube body of the heat pipe from breaking.
- The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein:
-
FIG. 1 is a perspective view of a preferred embodiment of the heat pipe structure of the present invention; and -
FIG. 2 is a sectional view of the preferred embodiment of the heat pipe structure of the present invention. - Please refer to
FIGS. 1 and 2 .FIG. 1 is a perspective view of a preferred embodiment of the heat pipe structure of the present invention.FIG. 2 is a sectional view of the preferred embodiment of the heat pipe structure of the present invention. The heat pipe structure of the present invention includes atubular body 1. - The
tubular body 1 has afirst end 11 and asecond end 12 and anairtight chamber 13. At least onecapillary structure layer 2 is disposed on a wall face of thetubular body 1. A workingfluid 3 is filled in theairtight chamber 13. The workingfluid 3 is selected from a group consisting of water, coolant, methanol and acetone. Thecapillary structure layer 2 is selected from a group consisting of sintered powders, channels, woven meshes and any combination thereof. Thetubular body 1 is selected from a group consisting of circular tube, flat tube and square tube. Thetubular body 1 is made of a material selected from a group consisting of aluminum, copper, stainless steel and titanium. Any of the first andsecond ends tubular body 1 is such arranged as to be normal to a horizontal face. That is, thetubular body 1 is vertically disposed. The first andsecond ends tubular body 1. One end of thetubular body 1 in contact with the horizontal face has abulged space 14 as an ice molecule releasing space after the workingfluid 3 is frozen. - The bulged
space 14 of thetubular body 1 has a capacity larger than that of any other portion of thetubular body 1. Thebulged space 14 is formed in such a manner that the tubular wall of thetubular body 1 upright upward protrudes to form an expanded space. Alternatively, thebulged space 14 is formed in such a manner that the tubular wall of thetubular body 1 horizontally leftward or rightward protrudes to form an expanded space. - The problem solved by the present invention is that when the heat pipe is vertically used, the working fluid will accumulate at the lower end. At this time, in the case that the environmental temperature is lower than zero degree, the working fluid in the heat pipe at the lower end will be frozen so that the portion of the heat pipe in which the working fluid is frozen will be expanded or even exploded and broken. Therefore, in the present invention, when the heat pipe is vertically used, the
bulged space 14 is formed at the lower end of the heat pipe as an ice molecule releasing space after the working fluid is frozen. Alternatively, both of two ends of the heat pipe can be formed with thebulged spaces 14. Still alternatively, the bulgedspace 14 can be formed on any portion of the heat pipe in accordance with the use state of the heat pipe. - The present invention has been described with the above embodiments thereof and it is understood that many changes and modifications in such as the form or layout pattern or practicing step of the above embodiments can be carried out without departing from the scope and the spirit of the invention that is intended to be limited only by the appended claims.
Claims (7)
1. A heat pipe structure comprising a tubular body having a first end, a second end, and an airtight chamber, at least one capillary structure layer disposed on a wall face of the tubular body, and a working fluid filled in the airtight chamber, the first end and second end being respectively positioned at an axial upper end and an axial lower end of the tubular body, where the tubular body is erected to stand vertically such that an elevation of the first end at the axial upper end is higher than an elevation of the second end at the axial lower end and wherein the second end of the tubular body has a bulged space configured as an ice molecule releasing space after the working fluid is frozen.
2. The heat pipe structure as claimed in claim 1 , wherein the bulged space of the tubular body is positioned at the lower end of the tubular body, the bulged space having a capacity larger than that of any other portion of the tubular body.
3. (canceled)
4. The heat pipe structure as claimed in claim 1 , wherein the bulged space is formed in such a manner that a tubular wall of the tubular body protrudes radially leftward or radially rightward to form the bulged space.
5. The heat pipe structure as claimed in claim 1 , wherein the tubular body is made of a material selected from a group consisting of aluminum, copper, stainless steel and titanium.
6. The heat pipe structure as claimed in claim 1 , wherein the working fluid is selected from a group consisting of water, coolant, methanol and acetone.
7. The heat pipe structure as claimed in claim 1 , wherein the bulged space is formed in such a manner that the tubular wall of the tubular body radially protrudes to form an expanded space.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17/317,901 US20220364794A1 (en) | 2021-05-12 | 2021-05-12 | Heat pipe structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17/317,901 US20220364794A1 (en) | 2021-05-12 | 2021-05-12 | Heat pipe structure |
Publications (1)
Publication Number | Publication Date |
---|---|
US20220364794A1 true US20220364794A1 (en) | 2022-11-17 |
Family
ID=83999404
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17/317,901 Pending US20220364794A1 (en) | 2021-05-12 | 2021-05-12 | Heat pipe structure |
Country Status (1)
Country | Link |
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US (1) | US20220364794A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2997858A (en) * | 1953-04-09 | 1961-08-29 | Perez William | Thermal cooling element |
US20140055954A1 (en) * | 2012-08-23 | 2014-02-27 | Asia Vital Components Co., Ltd. | Heat pipe structure, and thermal module and electronic device using same |
-
2021
- 2021-05-12 US US17/317,901 patent/US20220364794A1/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2997858A (en) * | 1953-04-09 | 1961-08-29 | Perez William | Thermal cooling element |
US20140055954A1 (en) * | 2012-08-23 | 2014-02-27 | Asia Vital Components Co., Ltd. | Heat pipe structure, and thermal module and electronic device using same |
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