US20090159648A1 - Device and method for brazing a heat pipe - Google Patents
Device and method for brazing a heat pipe Download PDFInfo
- Publication number
- US20090159648A1 US20090159648A1 US12/396,863 US39686309A US2009159648A1 US 20090159648 A1 US20090159648 A1 US 20090159648A1 US 39686309 A US39686309 A US 39686309A US 2009159648 A1 US2009159648 A1 US 2009159648A1
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- US
- United States
- Prior art keywords
- pipe
- heat pipe
- brazing
- heat
- bracket assembly
- 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.)
- Abandoned
Links
- 238000005219 brazing Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000000945 filler Substances 0.000 claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 30
- 239000010959 steel Substances 0.000 claims abstract description 30
- 230000000712 assembly Effects 0.000 claims abstract description 23
- 238000000429 assembly Methods 0.000 claims abstract description 23
- 229910001316 Ag alloy Inorganic materials 0.000 claims abstract description 22
- YCKOAAUKSGOOJH-UHFFFAOYSA-N copper silver Chemical compound [Cu].[Ag].[Ag] YCKOAAUKSGOOJH-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 20
- 239000002826 coolant Substances 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 239000011449 brick Substances 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 230000017525 heat dissipation Effects 0.000 abstract description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the subgroups H01L21/06 - H01L21/326
- H01L21/4814—Conductive parts
- H01L21/4871—Bases, plates or heatsinks
- H01L21/4882—Assembly of heatsink parts
Definitions
- the invention relates to a device and method for brazing a heat pipe with copper-silver alloy filler to improve heat dissipation efficiency of the heat pipe.
- heat sinks and fans are used to dissipate heat from electronic equipment. Since heat is dissipated at a heat transfer rate proportional to a conventional heat sink's surface area, fins are attached to the heat sink to increase the surface area so more heat will be dissipated.
- small, modern electronic equipment size limits how many and how large fins can be, which provides an upper limit to how much heat can be effectively dissipated by a heat sink attached to the electronic equipment. Since heat pipes transfer heat at a much higher rate than heat sinks and fans and can be made to be much smaller than a heat sink and fan, heat pipes are excellent candidates for heat dissipation in small, high performance electronic equipment.
- the heat transfer coefficient (h wf ) of a working fluid in a heat pipe is much higher than the heat transfer coefficient (h a ) of air as in a heat sink or fan.
- tin In a conventional assembly process of a heat pipe, tin is often used as a filler to braze components of the heat pipe together and is covered with flux to reduce oxidation of the tin.
- tin has a low melting point and heat-transfer coefficient (h) and is poorly suited to dissipate heat generated by high performance electronic equipment.
- traditional heat pipe components soldering with tin can not pass a reduction procedure at 400° C. Therefore, reliability of the heat pipe is poor.
- the heat pipe is hollow and air-tight, has an internal cavity, an inside surface and a wick and has a vacuum inside to maintain its heat-transfer efficiency.
- flux covering the components of heat pipe may degrade performance of the wick on the inside surface inside the heat pipe and decrease the heat-transfer efficiency of the heat pipe by raising the evaporation and condensation temperatures of the working fluid.
- the heat pipe In a conventional heat pipe manufacturing process, the heat pipe is usually between 100 millimeter and 300 millimeter in length, is cut to fit a product specification and sealed at one end.
- the sealed end cannot transfer heat. The bigger the heat pipe is, the longer the sealed end is. Therefore the sealed end reduces the heat-transfer efficiency of the heat pipe.
- the objective of the present invention is to braze a heat pipe with a copper-silver alloy filler to improve heat dissipation efficiency of the heat pipe.
- a device for brazing a heat pipe comprises a brazing furnace and a conveyor.
- the brazing furnace comprises an open ended passage with a multi-stage brazing heater and cooler.
- the conveyor comprises an input bracket assembly, an output bracket assembly and a steel mesh belt.
- a method for brazing a heat pipe in accordance with the present invention comprises steps of (A) providing multiple heat pipe components, (B) assembling the heat pipe components, (C) injecting mixed gas, (D) turning on the multi-stage brazing heater and cooler, (E) placing the heat pipe assemblies on the conveyor, (F) brazing the heat pipe assemblies, (G) cooling the heat pipes and (H) removing the heat pipes from the conveyor.
- FIG. 1 is a perspective view of a device in accordance with the present invention for brazing components of a heat pipe.
- FIG. 2 is a flow chart of a method in accordance with the present invention for brazing components of a heat pipe.
- FIG. 3 is an exploded perspective view of primary components of a heat pipe to be brazed with the method in FIG. 2 .
- FIG. 4 is a partially exploded perspective view of components of a heat pipe to be brazed with the method in FIG. 2 .
- FIG. 5 is a perspective view of assembled components of a heat pipe to be brazed with the method in FIG. 2 .
- FIG. 6 is a perspective view of components of a heat pipe brazed with the method in FIG. 2 .
- a device in accordance with the present invention brazes components of a heat pipe ( 2 ) having a pipe ( 21 ), a base ( 22 ), a cover ( 23 ), a small pipe ( 24 ) and multiple copper-silver alloy fillers ( 25 A, 25 B, 26 ) using a method in accordance with the present invention to braze the components.
- the pipe ( 21 ) is hollow and has a diameter, a lower end, an upper end, an inside surface and a wick.
- the base ( 22 ) is larger than the diameter of the pipe ( 21 ), has an upper surface and is mounted on the lower end of the pipe ( 21 ).
- the upper surface of the base ( 22 ) has an optional recess in which the lower end of the pipe may be mounted.
- the cover ( 23 ) is mounted in the upper end of the pipe ( 21 ) and has a central through-hole ( 231 ).
- the small pipe ( 24 ) is mounted in and protrudes longitudinally from the central through-hole ( 231 ).
- the copper-silver alloy filler rings ( 25 A, 25 B, 26 ) comprise two large filler rings ( 25 A, 25 B) and a small filler ring ( 26 ).
- the large filler rings ( 25 A, 25 B) correspond to the pipe ( 21 ) and comprise a large upper filler ring ( 25 B) and a large lower filler ring ( 25 A).
- the large upper filler ring ( 25 B) is mounted on the upper end of the pipe ( 21 ) against the cover ( 23 ).
- the large lower filler ring ( 25 A) is mounted around the pipe ( 21 ) and against the base ( 22 ).
- the small filler ring ( 26 ) corresponds to the small pipe ( 24 ) and is mounted around the small pipe ( 24 ) and against the cover ( 23 ).
- the device for brazing components of a heat pipe ( 2 ) with the copper-silver alloy fillers ( 25 A, 25 B, 26 ) to improve heat dissipation efficiency of the heat pipe ( 2 ) comprises a brazing furnace ( 11 ) and a conveyor ( 12 ).
- the brazing furnace ( 11 ) is an elongated structure, has an input end and an output end and comprises a housing ( 111 ), a steel liner ( 112 ), multiple injection nozzles, a multi-stage brazing heater and a cooler.
- the housing ( 111 ) is made of fire brick and has an input end, an output end, an internal, longitudinal passage, multiple mixed gas injection ports ( 1111 ), a cooling medium input ( 1112 ) and a cooling medium discharge ( 1113 ).
- the input end has an opening.
- the output end has an opening that corresponds to and is aligned with the opening in the input end.
- the internal, longitudinal passage is formed between and communicates with the openings in the input and output ends and is straight.
- the mixed gas injection ports ( 1111 ) are formed at intervals along the housing ( 111 ).
- the cooling medium input ( 1112 ) is formed through the housing ( 111 ) near the output end.
- the cooling medium discharge ( 1113 ) is formed through the housing ( 111 ) near the output end.
- the steel liner ( 112 ) corresponds to and is mounted in the internal, longitudinal passage and comprises an inner wall, a smooth floor and multiple temperature sensors ( 1121 ).
- the inner wall has multiple mixed gas through-holes ( 1122 ), two cooling medium through-holes ( 1123 ), opposite sides and a ceiling.
- the mixed gas through-holes ( 1122 ) correspond to and align respectively with the mixed gas injection ports ( 1111 ) in the housing ( 111 ).
- the cooling medium through-holes ( 1123 ) correspond to and align respectively with the cooling medium input ( 1112 ) and discharge ( 1113 ).
- the temperature sensors ( 1121 ) are mounted longitudinally at intervals on the inner wall of the steel liner ( 112 ).
- the injection nozzles are mounted detachably respectively in aligned pairs of mixed gas injection ports ( 1111 ) in the housing ( 111 ) and mixed gas through-holes ( 1122 ) in the steel liner ( 112 ) and connect to an external mixed gas source.
- the multi-stage brazing heater is mounted in the steel liner ( 112 ) of the brazing furnace ( 11 ) adjacent to the input end and comprises at least two heating elements ( 114 ).
- Each heating element ( 114 ) is formed in a wave shape and is mounted on the sides and ceiling of the inner wall of the steel liner ( 112 ). Adjacent heating elements ( 114 ) may longitudinally overlap somewhat.
- the cooler is mounted in the steel liner ( 112 ) of the brazing furnace ( 11 ) between the multi-stage brazing heater and the opening in the output end and comprises at least one cooling element ( 115 ) and at least one cooling medium input nozzle and one cooling medium discharge nozzle.
- the cooling element ( 115 ) is mounted on the inner wall and connects to the cooling medium through-holes ( 1123 ).
- the conveyor ( 12 ) moves assembled components of heat pipes ( 2 ) through the brazing furnace ( 11 ) to melt the copper-silver alloy filler rings (( 25 A, 25 B, 26 ) to securely join components of a heat pipe ( 2 ) and fill any gaps between components and comprises an input bracket assembly ( 121 ), an output bracket assembly ( 122 ) and a steel mesh belt ( 123 ).
- the input bracket assembly ( 121 ) is mounted adjacent to the input end of the brazing furnace ( 11 ) and comprises a flat top, two elongated legs and a drive pulley.
- the flat top is parallel to the floor of the steel liner ( 112 ) and has a front edge, two side edges and a rear edge. The front edge may abut the input end of the housing ( 111 ).
- the rear edge has a rectangular notch.
- the elongated legs are connected respectively to the side edges of the flat top and protrude down.
- the drive pulley is rotatably mounted between the elongated legs under the flat top, is aligned with the rectangular notch in the rear edge and may be driven by a motor mounted under the flat top by a shaft or gear train.
- the output bracket assembly ( 122 ) is mounted adjacent to the output end of the brazing furnace ( 11 ) and comprises a flat top, two elongated legs and an idler.
- the flat top is parallel to the floor of the steel liner ( 112 ) and has a rear edge, two side edges and a front edge. The rear edge may abut the output end of the housing ( 111 ).
- the front edge has a rectangular notch.
- the elongated legs are connected respectively to the side edges of the flat top and protrude down.
- the idler is rotatably mounted between the elongated legs under the flat top and is aligned with the rectangular notch in the front edge.
- the steel mesh belt ( 123 ) is mounted around the drive pulley of the input bracket assembly ( 121 ) and the idler of the output bracket assembly ( 122 ) in a loop and comprises an upper outbound leg and a lower return leg.
- the upper outbound leg after passing around the drive pulley slides along the flat top of the input bracket assembly ( 121 ) on which heat pipe assemblies ( 2 ′) that have not been brazed are placed on the steel mesh belt ( 123 ), the floor of the steel liner ( 112 ) of the brazing furnace ( 11 ) and the flat top of the output bracket assembly ( 122 ) and extends around the idler.
- the lower return leg extends from the idler, passes under the output bracket assembly ( 122 ), the brazing furnace ( 11 ) and the input bracket assembly ( 121 ) and engages the drive pulley.
- the method for brazing components of a heat pipe ( 2 ) having a pipe ( 21 ), a base ( 22 ), a cover ( 23 ), a small pipe ( 24 ) and multiple copper-silver alloy fillers ( 25 A, 25 B, 26 ) comprises steps of (A) providing multiple heat pipe ( 2 ) components, (B) assembling the heat pipe ( 2 ) components, (C) injecting mixed gas, (D) turning on the multi-stage brazing heater and cooler, (E) placing heat pipe assemblies ( 2 ′) on the conveyor ( 12 ), (F) brazing the heat pipe assemblies ( 2 ′), (G) cooling the heat pipes ( 2 ) and (H) removing the heat pipes ( 2 ) from the conveyor ( 12 ).
- the step of (A) providing multiple heat pipe components comprises obtaining heat pipe ( 2 ) components comprising pipes ( 21 ), bases ( 22 ), covers ( 23 ), small pipes ( 24 ) and copper-silver alloy filler rings ( 25 A, 25 B, 26 ).
- the pipes ( 21 ) are hollow, and each pipe ( 21 ) has a lower end and an upper end.
- Each base ( 22 ) is larger than the pipe ( 21 ) and has an upper surface and an optional recess.
- the recess corresponds to the pipe ( 21 ).
- Each cover ( 23 ) includes a central through-hole ( 231 ).
- the small pipes ( 24 ) correspond respectively to the central through-holes ( 231 ).
- the step of (B) assembling the heat pipe components to form heat pipe assemblies ( 2 ′) comprises steps of (B1) assembling primary components of the heat pipe ( 2 ) and (B2) mounting copper-silver alloy filler rings ( 25 A, 25 B, 26 ) respectively at joints between primary components.
- the step of (B1) assembling primary components of the heat pipe ( 2 ) comprises mounting the lower end of the pipe ( 21 ) on the upper surface of the base ( 22 ), mounting the cover ( 23 ) on the upper end of the pipe ( 21 ) and mounting the small pipe ( 24 ) in the central through-hole ( 231 ).
- gaps will exist between primary components after this assembly step.
- step of (B2) mounting the copper-silver alloy filler rings ( 25 A, 25 B, 26 ) respectively at joints between the primary components will cause the copper-silver alloy filler rings ( 25 A, 25 B, 26 ) to fill and close gaps between primary components when brazed and melted.
- the step of (C) injecting mixed gas comprises injecting N 2 , NH 4 and H 2 in a ratio of 2:1:1 into the steel liner ( 112 ) of the brazing furnace ( 11 ) at the heating elements ( 114 ).
- the step of (D) turning on the multi-stage brazing heater and cooler causes the initial stage to heat to approximately 220° C. and burn the mixed gas to evacuate most oxygen in the brazing furnace ( 11 ) and remove any impurities from inside the steel liner ( 112 ) to obviate oxidation of the heat pipe assemblies ( 2 ′) in the brazing furnace ( 11 ).
- the step of (E) placing the heat pipe assemblies ( 2 ′) on the conveyor ( 12 ) comprises placing the heat pipe assemblies ( 2 ′) on the conveyor ( 12 ) sliding on the input bracket assembly ( 121 ) to be carried into and through the brazing furnace ( 11 ).
- the step of (F) brazing the heat pipe assemblies ( 2 ′) to form heat pipes ( 2 ) comprises moving the heat pipe assemblies ( 2 ′) through the multi-stage heating elements ( 114 ), heating the heat pipe assemblies ( 2 ′) to approximately 780° C. and melting the copper-silver alloy filler rings ( 25 A, 25 B, 26 ) to fill any gaps.
- the step of (G) cooling the heat pipe ( 2 ) comprises moving the brazed heat pipes ( 2 ) through the cooling element ( 15 ) and onto the output bracket assembly ( 122 ) after the heat pipes ( 2 ) are cooled to approximately 150° C.
- the step of (H) removing the heat pipe ( 2 ) from the conveyor ( 12 ) comprises removing the heat pipes ( 2 ) from the output bracket assembly ( 122 ) after the molten copper-silver alloy filler rings ( 25 A, 25 B, 26 ) solidify may be performed robotically.
- the heat pipes ( 2 ) manufactured by the device and method in accordance with the present invention can pass a reduction procedure at 400° C., a thermal shock testing between ⁇ 80° C. and 150° C. and a high temperature testing at 300° C. for 72 hours to have good reliability, can maintain its heat conductivity during normal operation and can be used in a field of IC design, LED module and thermal energy recycling.
- the field of thermal energy recycling includes waste heat, hot water, solar energy industry and so like.
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
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- Microelectronics & Electronic Packaging (AREA)
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Abstract
The present invention relates to a device and method for brazing a heat pipe assembly with copper-silver alloy filler rings to improve heat dissipation efficiency of a heat pipe. The device comprises a brazing furnace and a conveyor. The brazing furnace comprises an open ended passage with a multi-stage brazing heater and cooler. The conveyor comprises an input bracket assembly, an output bracket assembly and a steel mesh belt. The method comprises steps of (A) providing multiple heat pipe components, (B) assembling the heat pipe components to form heat pipe assemblies, (C) injecting mixed gas, (D) turning on the multi-stage brazing heater and cooler, (E) placing the heat pipe assemblies on the conveyor, (F) brazing the heat pipe assemblies to form heat pipes, (G) cooling the heat pipes and (H) removing the heat pipes from the conveyor.
Description
- The invention relates to a device and method for brazing a heat pipe with copper-silver alloy filler to improve heat dissipation efficiency of the heat pipe.
- With recent reductions in electronic equipment size, performance of electronic equipment has increased dramatically. Higher performance has resulted in more internal heat and higher operating temperature. Without effective dissipation of the internal heat, reliability and life span of the associated electronic equipment is adversely affected.
- To dissipate heat from electronic equipment, conventional heat sinks and fans are used. Since heat is dissipated at a heat transfer rate proportional to a conventional heat sink's surface area, fins are attached to the heat sink to increase the surface area so more heat will be dissipated. However, small, modern electronic equipment size limits how many and how large fins can be, which provides an upper limit to how much heat can be effectively dissipated by a heat sink attached to the electronic equipment. Since heat pipes transfer heat at a much higher rate than heat sinks and fans and can be made to be much smaller than a heat sink and fan, heat pipes are excellent candidates for heat dissipation in small, high performance electronic equipment.
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- Q=Thermal energy in Joules
- h=Heat transfer coefficient
- A=Surface area of the heat being transferred
- T0=Temperature of the object's surface
- Tenv=Temperature of the environment
- Specifically, the heat transfer coefficient (hwf) of a working fluid in a heat pipe is much higher than the heat transfer coefficient (ha) of air as in a heat sink or fan.
- In a conventional assembly process of a heat pipe, tin is often used as a filler to braze components of the heat pipe together and is covered with flux to reduce oxidation of the tin. However, tin has a low melting point and heat-transfer coefficient (h) and is poorly suited to dissipate heat generated by high performance electronic equipment. In addition, traditional heat pipe components soldering with tin can not pass a reduction procedure at 400° C. Therefore, reliability of the heat pipe is poor.
- The heat pipe is hollow and air-tight, has an internal cavity, an inside surface and a wick and has a vacuum inside to maintain its heat-transfer efficiency. However, flux covering the components of heat pipe may degrade performance of the wick on the inside surface inside the heat pipe and decrease the heat-transfer efficiency of the heat pipe by raising the evaporation and condensation temperatures of the working fluid.
- In a conventional heat pipe manufacturing process, the heat pipe is usually between 100 millimeter and 300 millimeter in length, is cut to fit a product specification and sealed at one end. The sealed end cannot transfer heat. The bigger the heat pipe is, the longer the sealed end is. Therefore the sealed end reduces the heat-transfer efficiency of the heat pipe.
- The objective of the present invention is to braze a heat pipe with a copper-silver alloy filler to improve heat dissipation efficiency of the heat pipe.
- A device for brazing a heat pipe comprises a brazing furnace and a conveyor. The brazing furnace comprises an open ended passage with a multi-stage brazing heater and cooler. The conveyor comprises an input bracket assembly, an output bracket assembly and a steel mesh belt.
- A method for brazing a heat pipe in accordance with the present invention comprises steps of (A) providing multiple heat pipe components, (B) assembling the heat pipe components, (C) injecting mixed gas, (D) turning on the multi-stage brazing heater and cooler, (E) placing the heat pipe assemblies on the conveyor, (F) brazing the heat pipe assemblies, (G) cooling the heat pipes and (H) removing the heat pipes from the conveyor.
-
FIG. 1 is a perspective view of a device in accordance with the present invention for brazing components of a heat pipe. -
FIG. 2 is a flow chart of a method in accordance with the present invention for brazing components of a heat pipe. -
FIG. 3 is an exploded perspective view of primary components of a heat pipe to be brazed with the method inFIG. 2 . -
FIG. 4 is a partially exploded perspective view of components of a heat pipe to be brazed with the method inFIG. 2 . -
FIG. 5 is a perspective view of assembled components of a heat pipe to be brazed with the method inFIG. 2 . -
FIG. 6 is a perspective view of components of a heat pipe brazed with the method inFIG. 2 . - With reference to
FIGS. 1 , 3, 4, 5 and 6, a device in accordance with the present invention brazes components of a heat pipe (2) having a pipe (21), a base (22), a cover (23), a small pipe (24) and multiple copper-silver alloy fillers (25A, 25B, 26) using a method in accordance with the present invention to braze the components. The pipe (21) is hollow and has a diameter, a lower end, an upper end, an inside surface and a wick. The base (22) is larger than the diameter of the pipe (21), has an upper surface and is mounted on the lower end of the pipe (21). The upper surface of the base (22) has an optional recess in which the lower end of the pipe may be mounted. The cover (23) is mounted in the upper end of the pipe (21) and has a central through-hole (231). The small pipe (24) is mounted in and protrudes longitudinally from the central through-hole (231). The copper-silver alloy filler rings (25A, 25B, 26) comprise two large filler rings (25A, 25B) and a small filler ring (26). The large filler rings (25A, 25B) correspond to the pipe (21) and comprise a large upper filler ring (25B) and a large lower filler ring (25A). The large upper filler ring (25B) is mounted on the upper end of the pipe (21) against the cover (23). The large lower filler ring (25A) is mounted around the pipe (21) and against the base (22). The small filler ring (26) corresponds to the small pipe (24) and is mounted around the small pipe (24) and against the cover (23). - The device for brazing components of a heat pipe (2) with the copper-silver alloy fillers (25A, 25B, 26) to improve heat dissipation efficiency of the heat pipe (2) comprises a brazing furnace (11) and a conveyor (12).
- The brazing furnace (11) is an elongated structure, has an input end and an output end and comprises a housing (111), a steel liner (112), multiple injection nozzles, a multi-stage brazing heater and a cooler.
- The housing (111) is made of fire brick and has an input end, an output end, an internal, longitudinal passage, multiple mixed gas injection ports (1111), a cooling medium input (1112) and a cooling medium discharge (1113). The input end has an opening. The output end has an opening that corresponds to and is aligned with the opening in the input end. The internal, longitudinal passage is formed between and communicates with the openings in the input and output ends and is straight. The mixed gas injection ports (1111) are formed at intervals along the housing (111). The cooling medium input (1112) is formed through the housing (111) near the output end. The cooling medium discharge (1113) is formed through the housing (111) near the output end.
- The steel liner (112) corresponds to and is mounted in the internal, longitudinal passage and comprises an inner wall, a smooth floor and multiple temperature sensors (1121). The inner wall has multiple mixed gas through-holes (1122), two cooling medium through-holes (1123), opposite sides and a ceiling. The mixed gas through-holes (1122) correspond to and align respectively with the mixed gas injection ports (1111) in the housing (111). The cooling medium through-holes (1123) correspond to and align respectively with the cooling medium input (1112) and discharge (1113). The temperature sensors (1121) are mounted longitudinally at intervals on the inner wall of the steel liner (112).
- The injection nozzles are mounted detachably respectively in aligned pairs of mixed gas injection ports (1111) in the housing (111) and mixed gas through-holes (1122) in the steel liner (112) and connect to an external mixed gas source.
- The multi-stage brazing heater is mounted in the steel liner (112) of the brazing furnace (11) adjacent to the input end and comprises at least two heating elements (114). Each heating element (114) is formed in a wave shape and is mounted on the sides and ceiling of the inner wall of the steel liner (112). Adjacent heating elements (114) may longitudinally overlap somewhat.
- The cooler is mounted in the steel liner (112) of the brazing furnace (11) between the multi-stage brazing heater and the opening in the output end and comprises at least one cooling element (115) and at least one cooling medium input nozzle and one cooling medium discharge nozzle. The cooling element (115) is mounted on the inner wall and connects to the cooling medium through-holes (1123).
- The conveyor (12) moves assembled components of heat pipes (2) through the brazing furnace (11) to melt the copper-silver alloy filler rings ((25A, 25B, 26) to securely join components of a heat pipe (2) and fill any gaps between components and comprises an input bracket assembly (121), an output bracket assembly (122) and a steel mesh belt (123).
- The input bracket assembly (121) is mounted adjacent to the input end of the brazing furnace (11) and comprises a flat top, two elongated legs and a drive pulley. The flat top is parallel to the floor of the steel liner (112) and has a front edge, two side edges and a rear edge. The front edge may abut the input end of the housing (111). The rear edge has a rectangular notch. The elongated legs are connected respectively to the side edges of the flat top and protrude down. The drive pulley is rotatably mounted between the elongated legs under the flat top, is aligned with the rectangular notch in the rear edge and may be driven by a motor mounted under the flat top by a shaft or gear train.
- The output bracket assembly (122) is mounted adjacent to the output end of the brazing furnace (11) and comprises a flat top, two elongated legs and an idler. The flat top is parallel to the floor of the steel liner (112) and has a rear edge, two side edges and a front edge. The rear edge may abut the output end of the housing (111). The front edge has a rectangular notch. The elongated legs are connected respectively to the side edges of the flat top and protrude down. The idler is rotatably mounted between the elongated legs under the flat top and is aligned with the rectangular notch in the front edge.
- The steel mesh belt (123) is mounted around the drive pulley of the input bracket assembly (121) and the idler of the output bracket assembly (122) in a loop and comprises an upper outbound leg and a lower return leg.
- The upper outbound leg after passing around the drive pulley slides along the flat top of the input bracket assembly (121) on which heat pipe assemblies (2′) that have not been brazed are placed on the steel mesh belt (123), the floor of the steel liner (112) of the brazing furnace (11) and the flat top of the output bracket assembly (122) and extends around the idler. The lower return leg extends from the idler, passes under the output bracket assembly (122), the brazing furnace (11) and the input bracket assembly (121) and engages the drive pulley.
- With further reference to
FIG. 2 , the method for brazing components of a heat pipe (2) having a pipe (21), a base (22), a cover (23), a small pipe (24) and multiple copper-silver alloy fillers (25A, 25B, 26) comprises steps of (A) providing multiple heat pipe (2) components, (B) assembling the heat pipe (2) components, (C) injecting mixed gas, (D) turning on the multi-stage brazing heater and cooler, (E) placing heat pipe assemblies (2′) on the conveyor (12), (F) brazing the heat pipe assemblies (2′), (G) cooling the heat pipes (2) and (H) removing the heat pipes (2) from the conveyor (12). - The step of (A) providing multiple heat pipe components comprises obtaining heat pipe (2) components comprising pipes (21), bases (22), covers (23), small pipes (24) and copper-silver alloy filler rings (25A, 25B, 26). The pipes (21) are hollow, and each pipe (21) has a lower end and an upper end. Each base (22) is larger than the pipe (21) and has an upper surface and an optional recess. The recess corresponds to the pipe (21). Each cover (23) includes a central through-hole (231). The small pipes (24) correspond respectively to the central through-holes (231).
- The step of (B) assembling the heat pipe components to form heat pipe assemblies (2′) comprises steps of (B1) assembling primary components of the heat pipe (2) and (B2) mounting copper-silver alloy filler rings (25A, 25B, 26) respectively at joints between primary components.
- The step of (B1) assembling primary components of the heat pipe (2) comprises mounting the lower end of the pipe (21) on the upper surface of the base (22), mounting the cover (23) on the upper end of the pipe (21) and mounting the small pipe (24) in the central through-hole (231). However, gaps will exist between primary components after this assembly step.
- The step of (B2) mounting the copper-silver alloy filler rings (25A, 25B, 26) respectively at joints between the primary components will cause the copper-silver alloy filler rings (25A, 25B, 26) to fill and close gaps between primary components when brazed and melted.
- The step of (C) injecting mixed gas comprises injecting N2, NH4 and H2 in a ratio of 2:1:1 into the steel liner (112) of the brazing furnace (11) at the heating elements (114).
- The step of (D) turning on the multi-stage brazing heater and cooler causes the initial stage to heat to approximately 220° C. and burn the mixed gas to evacuate most oxygen in the brazing furnace (11) and remove any impurities from inside the steel liner (112) to obviate oxidation of the heat pipe assemblies (2′) in the brazing furnace (11).
- The step of (E) placing the heat pipe assemblies (2′) on the conveyor (12) comprises placing the heat pipe assemblies (2′) on the conveyor (12) sliding on the input bracket assembly (121) to be carried into and through the brazing furnace (11).
- The step of (F) brazing the heat pipe assemblies (2′) to form heat pipes (2) comprises moving the heat pipe assemblies (2′) through the multi-stage heating elements (114), heating the heat pipe assemblies (2′) to approximately 780° C. and melting the copper-silver alloy filler rings (25A, 25B, 26) to fill any gaps.
- The step of (G) cooling the heat pipe (2) comprises moving the brazed heat pipes (2) through the cooling element (15) and onto the output bracket assembly (122) after the heat pipes (2) are cooled to approximately 150° C.
- The step of (H) removing the heat pipe (2) from the conveyor (12) comprises removing the heat pipes (2) from the output bracket assembly (122) after the molten copper-silver alloy filler rings (25A, 25B, 26) solidify may be performed robotically.
- The heat pipes (2) manufactured by the device and method in accordance with the present invention can pass a reduction procedure at 400° C., a thermal shock testing between −80° C. and 150° C. and a high temperature testing at 300° C. for 72 hours to have good reliability, can maintain its heat conductivity during normal operation and can be used in a field of IC design, LED module and thermal energy recycling. The field of thermal energy recycling includes waste heat, hot water, solar energy industry and so like.
Claims (10)
1. A device for brazing components of a heat pipe having a pipe being hollow and having a diameter, a lower end, an upper end, an inside surface and a wick; a base being larger than the diameter of the pipe, having an upper surface and being mounted on the lower end of the pipe; a cover being mounted in the upper end of the pipe and having a central through-hole; a small pipe being mounted in and protruding longitudinally from the central through-hole; and multiple copper-silver alloy filler rings being a large upper filler ring being mounted on the upper end of the pipe against the cover, a large lower filler ring being mounted around the pipe and against the base and a small filler ring corresponding to the small pipe and being mounted around the small pipe and against the cover, the device comprising
a brazing furnace being an elongated structure, having an input end and an output end and comprising
a housing being made of fire brick and having
an input end having an opening;
an output end having an opening corresponding to and being aligned with the opening in the input end;
an internal, longitudinal passage being formed between and communicating with the openings in the input and output ends and being straight;
multiple mixed gas injection ports being formed at intervals along the housing;
a cooling medium input being formed through the housing near the output end; and
a cooling medium discharge is formed through the housing near the output end;
a steel liner corresponding to and being mounted in the internal, longitudinal passage and comprising
an inner wall having
multiple mixed gas through-holes corresponding to and aligning respectively with the mixed gas injection ports in the housing;
two cooling medium through-holes corresponding to and aligning respectively with the cooling medium input and discharge;
opposite sides; and
a ceiling;
a smooth floor; and
multiple temperature sensors being mounted longitudinally at intervals on the inner wall of the steel liner;
multiple injection nozzles being mounted detachably respectively in aligned pairs of mixed gas injection ports in the housing and mixed gas through-holes in the steel liner and connecting to an external mixed gas source;
a multi-stage brazing heater being mounted in the steel liner of the brazing furnace adjacent to the input end and comprising at least two heating elements with each heating element being formed in a wave shape and being mounted on the sides and ceiling of the inner wall of the steel liner; and
a cooler being mounted in the steel liner of the brazing furnace between the multi-stage brazing heater and the opening in the output end and comprises
at least one cooling element being mounted on the inner wall and connecting to the cooling medium through-holes;
at least one cooling medium input nozzle; and
at least one cooling medium discharge nozzle; and
a conveyor moving assembled components of heat pipes through the brazing furnace to melt the copper-silver alloy filler rings to securely join components of a heat pipe and fill any gaps between components and comprising
an input bracket assembly being mounted adjacent to the input end of the brazing furnace and comprising
a flat top being parallel to the floor of the steel liner and having a front edge, two side edges and a rear edge having a rectangular notch;
two elongated legs being connected respectively to the side edges of the flat top and protruding down; and
a drive pulley being rotatably mounted between the elongated legs under the flat top and being aligned with the rectangular notch in the rear edge;
an output bracket assembly being mounted adjacent to the output end of the brazing furnace and comprising
a flat top being parallel to the floor of the steel liner and having a rear edge, two side edges and a front edge having a rectangular notch;
two elongated legs being connected respectively to the side edges of the flat top and protruding down; and
an idler being rotatably mounted between the elongated legs under the flat top and being aligned with the rectangular notch in the front edge; and
a steel mesh belt being mounted around the drive pulley of the input bracket assembly and the idler of the output bracket assembly in a loop and comprises
an upper outbound leg after passing around the drive pulley sliding along the flat top of the input bracket assembly on which heat pipe assemblies that have not been brazed are placed on the steel mesh belt, the floor of the steel liner of the brazing furnace where the components of the heat pipes are brazed and cooled and the flat top of the output bracket assembly where the brazed heat pipes are robotically removed for final fabrication and extending around the idler; and
a lower return leg extending from the idler, passing under the output bracket assembly, the brazing furnace and the input bracket assembly and engaging the drive pulley.
2. The device as claimed in claim 1 , wherein adjacent heating elements of the multi-stage brazing heater longitudinally overlap somewhat.
3. The device as claimed in claim 1 , wherein the front edge of the input bracket assembly abuts the input end of the housing.
4. The device as claimed in claim 1 , wherein the drive pulley is driven by a motor mounted under the flat top.
5. The device as claimed in claim 1 , wherein the rear edge of the output bracket assembly abuts the output end of the housing.
6. The device as claimed in claim 4 , wherein the drive pulley is driven by a shaft.
7. The device as claimed in claim 4 , wherein the drive pulley is driven by a gear train.
8. A method for brazing components of a heat pipe having a pipe, a base, a cover, a small pipe and multiple copper-silver alloy fillers comprising steps of
(A) providing multiple heat pipe components comprises obtaining heat pipe components comprising pipes being hollow, and each pipe having a lower end and an upper end, bases, each base is larger than the pipe and has an upper surface, covers, small pipes and copper-silver alloy filler rings;
(B) assembling the heat pipe components to form heat pipe assemblies comprises steps of
(B1) assembling primary components of the heat pipe comprises mounting the lower end of the pipe on the upper surface of the base, mounting the cover on the upper end of the pipe and mounting the small pipe in the central through-hole; and
(B2) mounting copper-silver alloy filler rings respectively at joints between primary components will cause the copper-silver alloy filler rings to fill and close gaps between primary components when brazed and melted;
(C) injecting mixed gas comprising injecting N2, NH4 and H2 in a ratio of 2:1:1 into the steel liner of the brazing furnace at the heating elements;
(D) turning on the multi-stage brazing heater and cooler causing the initial stage to heat to approximately 220° C. and burn the mixed gas to evacuate most oxygen in the brazing furnace and remove any impurities from inside the steel liner to obviate oxidation of the heat pipe assemblies in the brazing furnace;
(E) placing heat pipe assemblies on the conveyor comprises placing the heat pipe assemblies on the conveyor sliding on the input bracket assembly to be carried into and through the brazing furnace;
(F) brazing the heat pipe assemblies to form heat pipes comprises moving the heat pipe assemblies through the multi-stage heating elements, heating the heat pipe assemblies to approximately 780° C. and melting the copper-silver alloy filler rings to fill any gaps;
(G) cooling the heat pipes comprises moving the brazed heat pipes through the cooling element and onto the output bracket assembly after the heat pipes are cooled to approximately 150° C.; and
(H) removing the heat pipes from the conveyor comprises removing the heat pipes from the output bracket assembly after the molten copper-silver alloy filler rings solidify.
9. The method as claimed in claim 8 , wherein the upper surface of each base has a recess corresponding to the pipe.
10. The method as claimed in claim 8 , wherein removing the heat pipes from the output bracket assembly is performed robotically
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/396,863 US20090159648A1 (en) | 2004-04-13 | 2009-03-03 | Device and method for brazing a heat pipe |
US12/560,829 US7703663B2 (en) | 2004-04-13 | 2009-09-16 | Device and method for brazing a heat pipe |
US12/705,309 US20100140331A1 (en) | 2004-04-13 | 2010-02-12 | Device and method for brazing a heat pipe |
US13/400,487 US8496161B2 (en) | 2005-04-11 | 2012-02-20 | Device and method for brazing a heat pipe |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW093110301 | 2004-04-13 | ||
TW093110301A TW200533455A (en) | 2004-04-13 | 2004-04-13 | Method and device for brazing CPU heat sink modules |
US11/103,700 US20050252951A1 (en) | 2004-04-13 | 2005-04-11 | Method for assembling and brazing CPU heat sink modules |
US12/396,863 US20090159648A1 (en) | 2004-04-13 | 2009-03-03 | Device and method for brazing a heat pipe |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/103,700 Continuation US20050252951A1 (en) | 2004-04-13 | 2005-04-11 | Method for assembling and brazing CPU heat sink modules |
US11/103,700 Continuation-In-Part US20050252951A1 (en) | 2004-04-13 | 2005-04-11 | Method for assembling and brazing CPU heat sink modules |
Related Child Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/103,700 Continuation-In-Part US20050252951A1 (en) | 2004-04-13 | 2005-04-11 | Method for assembling and brazing CPU heat sink modules |
US12/560,829 Division US7703663B2 (en) | 2004-04-13 | 2009-09-16 | Device and method for brazing a heat pipe |
US12/705,309 Continuation-In-Part US20100140331A1 (en) | 2004-04-13 | 2010-02-12 | Device and method for brazing a heat pipe |
Publications (1)
Publication Number | Publication Date |
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US20090159648A1 true US20090159648A1 (en) | 2009-06-25 |
Family
ID=35308450
Family Applications (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/103,700 Abandoned US20050252951A1 (en) | 2004-04-13 | 2005-04-11 | Method for assembling and brazing CPU heat sink modules |
US12/396,863 Abandoned US20090159648A1 (en) | 2004-04-13 | 2009-03-03 | Device and method for brazing a heat pipe |
US12/560,829 Expired - Fee Related US7703663B2 (en) | 2004-04-13 | 2009-09-16 | Device and method for brazing a heat pipe |
US12/705,309 Abandoned US20100140331A1 (en) | 2004-04-13 | 2010-02-12 | Device and method for brazing a heat pipe |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/103,700 Abandoned US20050252951A1 (en) | 2004-04-13 | 2005-04-11 | Method for assembling and brazing CPU heat sink modules |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/560,829 Expired - Fee Related US7703663B2 (en) | 2004-04-13 | 2009-09-16 | Device and method for brazing a heat pipe |
US12/705,309 Abandoned US20100140331A1 (en) | 2004-04-13 | 2010-02-12 | Device and method for brazing a heat pipe |
Country Status (2)
Country | Link |
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US (4) | US20050252951A1 (en) |
TW (1) | TW200533455A (en) |
Cited By (2)
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US20100140331A1 (en) * | 2004-04-13 | 2010-06-10 | Wen-Chih Liao | Device and method for brazing a heat pipe |
CN105171176A (en) * | 2015-09-09 | 2015-12-23 | 奥英万科技有限公司 | Special-purpose welding machine for welding electronic key plug devices |
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TWM330736U (en) | 2007-09-14 | 2008-04-11 | Wen-Chi Liao | Heat-conduction pipe |
DE102018101453A1 (en) * | 2018-01-23 | 2019-07-25 | Borgwarner Ludwigsburg Gmbh | Heating device and method for producing a heating rod |
US10978313B2 (en) * | 2018-02-20 | 2021-04-13 | International Business Machines Corporation | Fixture facilitating heat sink fabrication |
US11278978B2 (en) * | 2019-06-21 | 2022-03-22 | International Business Machines Corporation | Pattern bonded finned cold plate |
CN111761156A (en) * | 2020-07-22 | 2020-10-13 | 厦门福鑫特工贸有限公司 | Brazing method for large computer radiator |
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Also Published As
Publication number | Publication date |
---|---|
TW200533455A (en) | 2005-10-16 |
US20100140331A1 (en) | 2010-06-10 |
US7703663B2 (en) | 2010-04-27 |
US20100001040A1 (en) | 2010-01-07 |
US20050252951A1 (en) | 2005-11-17 |
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