US20150129175A1 - Thermosyphon heat sink - Google Patents
Thermosyphon heat sink Download PDFInfo
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- US20150129175A1 US20150129175A1 US14/145,223 US201314145223A US2015129175A1 US 20150129175 A1 US20150129175 A1 US 20150129175A1 US 201314145223 A US201314145223 A US 201314145223A US 2015129175 A1 US2015129175 A1 US 2015129175A1
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- Prior art keywords
- heat
- chamber
- dissipating device
- gas
- liquid
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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
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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
- F28D15/046—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 characterised by the material or the construction of the 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
- F28D15/04—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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the present invention generally relates to a heat-dissipating device and, in particular to a thermosyphon heat sink.
- heat dissipating devices are usually used for cooling electronic components or semiconductor of electronic products or optoelectronic products.
- the conventional thermosyphon heat sink includes an evaporator, a condenser, a gas tube, a liquid tube and a working fluid.
- Two ends of the gas tube are connected with the evaporator and the condenser respectively.
- the liquid tube is connected with the evaporator and the condenser respectively.
- One side of the evaporator is contacted with the heating element, and the working fluid is filled in the evaporator.
- the heat generated from the heating element can be conducted to the working fluid through the evaporator.
- the working fluid absorbs the heat and is transformed into the gas, and the gas will flow into the condenser through the gas tube.
- the liquid will flow into the evaporator through the liquid tube after being cooled in the condenser to achieve the cooling circulation effect.
- thermosyphon heat sink has the following shortcomings:
- a path of gas flowing into the condenser from the evaporator through the gas tube and a path of gas flowing into the evaporator from the condenser are too long so that the fluid resistance is large and the circulation speed of the liquid and the gas is slow. As a result, the effect of heat dissipating is poor.
- the condenser is composed of a plurality of flat tubes, gas-gathering tubes and liquid gathering tubes so that the volume of the heat sink is large and the manufacturing process is complicated. As a result, the cost of the manufacturing process and the material will be increased.
- an object of the present invention is to provide a heat-dissipating device, wherein a stepped area is formed at a location where the liquid conduit is assembled with the chamber for gathering the liquid reflowing to the evaporating section after condensing, thereby the heat of the heating element will be absorbed continuously.
- the present invention provides a heat-dissipating device for contacting with a heating element.
- the heat-dissipating device includes a condenser and an evaporator.
- the condenser includes a shell and a main capillary wick.
- the shell has a chamber and a through hole communicating with the chamber, and the main capillary wick is disposed in the chamber.
- the evaporator includes an evaporating section having a gas cavity, a gas conduit communicating with the through hole, and a liquid conduit communicating with the chamber and filling with working fluid.
- the liquid conduit is inserted in the gas conduit and has a hole communicating with the gas cavity, and an outer surface of the evaporating section is contacted with the heating element; wherein a stepped area is formed at a location where the liquid conduit is assembled with the chamber, the liquid flows in the gas cavity and absorbs the heat generated from the heating element to be transformed into gas to flow in the chamber through the gas conduit, and the gas is transformed into the liquid and gathered in the stepped area by cooling the condenser for flowing in the liquid conduit.
- the present invention has the following effects.
- the liquid flows in the liquid conduit, and the gas flows in the gas conduit for achieving a flowing diversion effect.
- the liquid can be avoided from an affection of the gas when reflowing into the evaporating section, then a flowing resistance of the liquid and the gas can be reduced.
- the circulation speed of the liquid and the gas will be raised for a better heat dissipating effect of the heat sink.
- the auxiliary evaporating section and the evaporating section are arranged in a line or disposed in a staggered manner; therefore, cooling for a plurality of heating elements at the same time can be achieved.
- the liquid can flow quickly into the liquid conduit by an inclined plane of the chamber of the shell because of gravity.
- the cooling circulation of the liquid and the gas can be enhanced for a better cooling effect of the heat sink.
- a stepped area is formed at a location where the liquid conduit is assembled with the chamber for gathering the liquid reflow to the evaporating section after cooling.
- FIG. 1 is a perspective view of the first embodiment of the heat-dissipating device of the present invention
- FIG. 2 is a partially exploded view of the first embodiment of the heat-dissipating device of the present invention
- FIG. 3 is an exploded view of the condenser of the first embodiment of the present invention.
- FIG. 4 is a partially exploded view of the evaporator of the first embodiment of the heat-dissipating device of the present invention.
- FIG. 5 is a cross-sectional view of the first embodiment of the heat-dissipating device of the present invention after being assembled;
- FIG. 6 is a partially cross-sectional view of the condenser of the first embodiment of the heat-dissipating device of the present invention.
- FIG. 7 is a cross-sectional view of the evaporator of the first embodiment of the present invention.
- FIG. 8A is a schematic diagram of the first embodiment of the heat-dissipating device of the present invention while operating;
- FIG. 8B is another schematic diagram of the first embodiment of the heat-dissipating device of the present invention while operating;
- FIG. 8C is a schematic diagram of the protrusion of the evaporating section of the first embodiment of the present invention.
- FIG. 9 is a perspective view of the second embodiment of the heat-dissipating device of the present invention.
- FIG. 10 is an exploded view of the condenser of the second embodiment of the present invention as shown in FIG. 9 ;
- FIG. 11 is a cross-sectional view of the second embodiment of the heat-dissipating device of the present invention.
- FIG. 12 shows another type of the condenser of the heat-dissipating device of the present invention
- FIG. 13 shows further another type of the condenser of the heat-dissipating device of the present invention
- FIG. 14 is a perspective view of the third embodiment of the heat-dissipating device of the present invention.
- FIG. 15 is an exploded view of the condenser of the third embodiment of the heat-dissipating device of the present invention as shown in FIG. 15 ;
- FIG. 16 is a cross-sectional view of the condenser of the third embodiment of the present invention.
- FIG. 17 is an exploded view of the evaporator of the third embodiment of the present invention.
- FIG. 18 is a cross-sectional view of the third embodiment of the present invention.
- the present invention provides a heat-dissipating device or thermosyphon heat sink 1 for contacting with a heating element.
- the heat-dissipating device 1 includes a condenser 10 and an evaporator 20 .
- the condenser 10 includes a shell 11 , a main capillary wick 12 and a heat-dissipating body 13 .
- the shell 11 has a chamber 111 and a through hole 112 .
- the through hole 112 communicating with the chamber 111 is provided at one side of the shell 11 .
- the main capillary wick 12 is disposed in the chamber 111 .
- the main capillary wick 12 can be a metal net or a plurality of heat-dissipating fins, or disposed on an inner surface of the chamber 111 by sintering of metal powder or sand blasting.
- the main capillary wick 12 can be disposed at the inner wall of the chamber 111 and constituted by a foam material. Moreover, the main capillary wick 12 can also be configured in a wavy shape or provided as heat-dissipating fins.
- the heat dissipating bodies 13 are disposed on two opposite ends outside the shell 11 , and the heat-dissipating bodies 13 includes a plurality of heat-dissipating fins 131 arranged at intervals.
- the condenser 10 further includes a couple of lids 113 .
- a couple of entrances 110 communicating with the chamber 111 are disposed respectively at a front end and a back end of the shell 11 .
- Each lid 113 covers and seals the entrance 110 .
- the through hole 112 is disposed on one of the lids 113 , and the through hole 112 is communicated with the chamber 111 .
- the shell 11 can be formed by extruding for facilitating the manufacturing process of the shell 11 and saving the manufacturing cost.
- two sides of the bottom of the chamber 111 are formed with an inclined plane 114 respectively in a direction from an end of the lid 113 tilting toward the through hole 112 ; therefore, the wall thickness of the shell 11 is not equal.
- the evaporator 20 includes an evaporating section 21 , a gas conduit 22 , a liquid conduit 23 , working fluid and an auxiliary capillary wick 25 .
- An outer surface of the evaporating section 21 is connected with the heating element, and the gas conduit 22 is communicated with the through hole 112 at an end near the condenser 10 .
- the evaporating section 21 has a gas cavity 211 communicating with the through hole 112 , and the liquid conduit 23 communicating with the chamber 111 is filled with the working fluid.
- the working fluid can be, but not limited to, refrigerant or water etc.
- the gas conduit 22 and the liquid conduit 23 are, for example but not limited to, long elongated tubes.
- One side of the evaporating section 21 has an opening 212 and a cover 213 corresponding to the opening 212 .
- the opening 212 is communicated with the gas cavity 211
- the cover 213 is formed with an embedding slot 215 on a side near the gas cavity 211
- the cover 213 contacts with the heating element at a side away from the through hole 212 .
- the liquid conduit 23 is inserted in the gas conduit 22 and disposed in the gas cavity 211
- the gas conduit 22 has a hole 231 communicating with the gas cavity 211 .
- a cross section of the gas conduit 22 is larger than that of the liquid conduit 23 .
- the auxiliary capillary wick 25 is disposed in the gas cavity 211 of the evaporating section 21 , and one side of the auxiliary capillary wick 25 is connected with the embedding slot 215 .
- the auxiliary capillary wick 25 can be p a metal net or foam material disposed in the embedding slot 215 , or formed by a plurality of heat-dissipating fins or in the embedding slot 215 by sand blasting.
- the evaporator 20 further includes an auxiliary evaporating section 26 at a side of the evaporating section 21 away from the condenser 10 .
- the auxiliary evaporating section 26 and the evaporating section 21 are, but not limited to, in linear arrangement.
- the auxiliary evaporating section 26 further includes an auxiliary capillary wick 27 .
- the gas conduit 22 and the liquid conduit 23 are extended to the auxiliary evaporating section 26 .
- the auxiliary evaporating section 26 and the evaporating section 21 can be disposed in a staggered manner for cooling heating elements 9 in different positions to achieve the heat dissipation effect.
- the liquid conduit 23 is inserted in the gas conduit 22 and disposed in the gas cavity 211 . Besides, one end of the liquid conduit 23 near the condenser 10 is extended and inserted in the chamber 111 .
- a stepped area 100 (refer to FIG. 6 ) is formed in a location where the liquid conduit 23 is assembled in the chamber 111 .
- the liquid 24 flows in the gas cavity 211 through the hole 231 , and the liquid 24 is transformed into gas 241 by heat generated from the heating element in the gas cavity 211 and absorbed by the evaporating section 21 .
- the gas 241 flows to the chamber 111 through the gas conduit 22 and the gas 241 is transformed into the liquid 24 and gathered in the stepped area 100 by cooling the condenser 10 so that the liquid 24 flows into the liquid conduit 23 .
- the stepped area 100 is formed in an inner surface of the chamber 111 and located at a bottom of the main capillary wick 12 correspondingly.
- the liquid conduit 23 is disposed in the stepped area 100 .
- the stepped area 100 is located at the bottom of the center of the chamber 111 and formed as a storage space in the chamber 111 .
- the liquid 24 is gathered in the chamber 111 .
- the gas 241 in the condenser 10 is cooled and transformed into the liquid 24 , the liquid 24 can flow quickly from two sides of the bottom of the inner surface into the middle portion of the bottom of the chamber 11 by the gravity.
- the liquid 24 can flow into the liquid conduit 23 quickly, and the cooling circulation of the heat-dissipating device 1 will be enhanced for improving the cooling effect of the heat-dissipating device 1 .
- a rib 235 is extended between an inner surface of the gas conduit 22 and an outer surface of the liquid conduit 23 .
- the gas conduit 22 and the liquid conduit 23 can be formed as a single piece by aluminum extruding process.
- the liquid 24 in the liquid conduit 23 flows into the evaporating section 21 through the hole 231 of the liquid conduit 23 . Meanwhile, the heat of the heating element 9 will be conducted to the auxiliary capillary wick 25 through the cover 213 . The heat can be transferred to the liquid 24 by the auxiliary capillary wick 25 that enlarges the contacting areas with the liquid 24 in the gas cavity 211 .
- the liquid 24 absorbs the heat of the auxiliary capillary wick 25 and transforms into the gas 241 , the gas 241 will flow in the chamber 111 of the shell 11 through the gas conduit 22 .
- the heat can be transferred to the shell 11 through the main capillary wick 12 , and the shell 11 will conduct the heat to the heat-dissipating body 13 .
- the heat accumulated in the heat-dissipating body 13 will be dissipated to air through heat exchanging with air by the heat-dissipating fins 131 .
- the gas 241 in the chamber 111 will transform into the liquid 24 and flow into the liquid conduit 23 for next cooling circulation. Thus an effect of cooling heating element will be achieved.
- a flowing path between the liquid 24 and the gas 241 can be decreased by disposing the liquid conduit 23 in the gas conduit 22 .
- the liquid 24 flowing in the liquid conduit 23 with a smaller cross section has a low pressure.
- the gas 241 flowing in the gas conduit 22 with a larger cross section has a high pressure. Therefore, the liquid 24 and the gas 241 will achieve a flowing diversion effect.
- the liquid 24 can be avoided from an affection of the gas 241 when reflowing into the evaporating section 21 so as to reduce the flowing resistance of the liquid 24 and the gas 241 .
- the circulation speed of the liquid 24 and the gas 241 will be raised for a better heat dissipating effect of the heat-dissipating device.
- the lid 213 of the evaporating section 21 has a protrusion 214 at a side away from the gas cavity 211 , and the protrusion 214 is in thermal contact with the heating element.
- the opening 212 of the evaporating section 21 and the lid 213 can be omitted by protruding the wall of the evaporating section 21 .
- the lid 213 can be removed and a protrusion 214 ′ can be formed with the evaporating section 21 as a single piece shown in FIG. 8C .
- the heat-dissipating device 1 a includes a condenser 10 a and an evaporator 20 a.
- the condenser 10 a includes a shell 11 a, a main capillary wick 12 a and a heat-dissipating body 13 a.
- the shell 11 a has a chamber 111 a and a through hole 112 a.
- the evaporator 20 a includes an evaporating section 21 a, a gas conduit 22 a, a liquid conduit 23 a, a working fluid and an auxiliary capillary wick 25 a.
- the condenser 10 a in the present embodiment further includes a couple of lids 113 a.
- a couple of entrances 110 a communicating with the chamber 111 a are disposed at the left end and right end of the shell 11 a.
- Each lid 113 a covers and seals the entrance 110 a of the shell 11 a.
- the shell 11 a can be formed by extruding for simplifying the manufacturing process and saving the cost of the shell 11 a.
- an inclined plane 114 a is formed at the bottom of the chamber 111 a of the shell 11 a at a side away from the through hole 112 a and tilted toward the through hole 112 a.
- a top plane of the chamber 11 a is, preferably but not limited to, parallel to the inclined plane 114 a.
- the wall of the shell 11 a has an unequal thickness preferably.
- a further difference between this embodiment and the first embodiment is that one end of the liquid conduit 23 a in this embodiment is located in the through hole 112 a.
- the stepped area is formed between an inner surface 1110 a of the chamber 111 a and an inner surface 230 a of the liquid conduit 23 a.
- FIG. 12 showing another type of the condenser of the first and second embodiments.
- the condenser 10 b includes a shell 11 b, a main capillary wick 12 b and a heat-dissipating body (not shown).
- a difference between the present embodiment with the first embodiment and the second embodiment is that the shell 11 b is in one-piece form by bending a metal plate.
- the shell 11 b has a chamber 111 b, and a stepped area 100 b is provided at the bottom of the center of the chamber 111 b.
- the main capillary wick 12 b can be a metal net or disposed on an inner surface of the chamber 111 b by sintering of metal powder or sand blasting. Moreover, it can also be constituted by a foam material.
- two sides of the bottom of the chamber 111 b of the shell 11 b are formed with an inclined plane 114 b tilted from two sides of the shell 11 b toward the center of the bottom respectively.
- the inclined plane 114 b is formed by bending the shell 11 b directly.
- the condenser 10 c includes a shell 11 c, a main capillary wick 12 c and a heat-dissipating body (not shown), wherein the shell 11 c is in one-piece form by bending a metal plate.
- a difference between this embodiment and the above-described embodiments is that two sides of the bottom of the chamber 111 c of the shell 11 c are formed with an inclined plane 114 c extended and tilted from two sides of the shell 11 c toward the center of the bottom respectively, and a stepped area 100 c is provided at the bottom of the center of the chamber 111 c.
- the inclined plane 114 c is configured by disposing two oblique plates 13 c at two sides of the chamber 111 c of the shell 11 c and neighboring the stepped area 100 c, respectively.
- the condenser 10 d includes a shell 11 d and a main capillary wick 12 d.
- the shell 11 d has a chamber 111 d and a through hole 112 d communicating with the chamber 111 d at a side of the shell 11 d.
- the main capillary wick 12 d is disposed in the chamber 111 d.
- the main capillary wick 12 d includes a plurality of fins protruded from a top inner surface of the chamber 111 d to the bottom of an inner surface of the chamber 111 d.
- the evaporator 20 d includes an evaporating section 21 d with a gas cavity 211 d, a gas conduit 22 d communicating with the through hole 112 d, and a liquid conduit 23 d communicating with the chamber 111 d and filling with liquid.
- the liquid conduit 23 d is inserted in the gas conduit 22 d and has a hole 231 d communicating with the gas cavity 211 d.
- An outer surface of the evaporating section 21 d is contacted with the heating element.
- a location where the liquid conduit 23 d inserted in the chamber 111 d is formed with a stepped area 100 d.
- the liquid flows into the gas cavity 211 d through the hole 231 d, and the liquid transforms into gas by absorbing the heat of the heating element through the evaporating section 21 d.
- the gas flows into the chamber 111 d through the gas conduit 22 d and is transformed into liquid through the condenser 10 d for gathering in the stepped area 100 d and flowing into the liquid conduit 23 d.
- the stepped area 100 d is formed in an inner surface of the chamber 111 d and located at the bottom of the main capillary wick 12 d correspondingly.
- the liquid conduit 23 d is disposed on the stepped area 100 d.
- the stepped area 100 d is located at the bottom of the center of the chamber 111 d for gathering the liquid in the chamber 111 d.
- FIG. 18 showing the cross-sectional view of the heat-dissipating device of the present invention.
- a difference between the present embodiment and the first embodiment is that an end of liquid conduit 23 d in the present embodiment is located in the through hole 112 d.
- the stepped area 100 d ′ is formed between an inner surface 1110 d of the chamber 111 d and an inner surface 230 d of the liquid conduit 23 d.
- the gas flow and the gas flow are disposed in the same component of the heat-dissipating device of the present invention for reducing the module volume and the total cost.
- the liquid conduit of the heat-dissipating device of the present invention is assembled with the chamber to form a stepped area.
- the liquid after cooling can reflow to the middle zone of the condenser easily by the gravity.
- a storage can be made for storing the liquid. Therefore, the evaporated liquid due to heat absorption in the evaporator end can be rapidly supplemented for enhancing the heat transfer efficiency.
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Abstract
A heat-dissipating device includes a condenser and an evaporator. The condenser includes a shell and a main capillary wick. The shell has a chamber and a through hole communicating with the chamber. The main capillary wick is disposed in the chamber. The evaporator has an evaporating section, a gas conduit and a liquid conduit. The evaporating section has a gas cavity, and the liquid conduit communicating with the chamber and filling with a liquid. The liquid conduit having a hole communicating with the gas cavity is inserted in the gas conduit and the gas cavity. A stepped area is formed between the liquid conduit and the chamber for gathering the liquid flowing into the liquid conduit.
Description
- 1. Field of the Invention
- The present invention generally relates to a heat-dissipating device and, in particular to a thermosyphon heat sink.
- 2. Description of Prior Art
- Generally speaking, electronic components or semiconductor of electronic products or optoelectronic products generate a large amount of heat during operation. The electronic components or semiconductor should be prevented from overheating and causing damages to electronic products or optoelectronic products. The electronic products or optoelectronic products will be out of function due to overheating. Thus heat dissipating devices are usually used for cooling electronic components or semiconductor of electronic products or optoelectronic products.
- Taking Taiwanese patent No. 1339331 as an example, the conventional thermosyphon heat sink includes an evaporator, a condenser, a gas tube, a liquid tube and a working fluid. Two ends of the gas tube are connected with the evaporator and the condenser respectively. The liquid tube is connected with the evaporator and the condenser respectively. One side of the evaporator is contacted with the heating element, and the working fluid is filled in the evaporator. When using, the heat generated from the heating element can be conducted to the working fluid through the evaporator. The working fluid absorbs the heat and is transformed into the gas, and the gas will flow into the condenser through the gas tube. The liquid will flow into the evaporator through the liquid tube after being cooled in the condenser to achieve the cooling circulation effect.
- However, the conventional thermosyphon heat sink has the following shortcomings:
- (1) A path of gas flowing into the condenser from the evaporator through the gas tube and a path of gas flowing into the evaporator from the condenser are too long so that the fluid resistance is large and the circulation speed of the liquid and the gas is slow. As a result, the effect of heat dissipating is poor.
- (2) The condenser is composed of a plurality of flat tubes, gas-gathering tubes and liquid gathering tubes so that the volume of the heat sink is large and the manufacturing process is complicated. As a result, the cost of the manufacturing process and the material will be increased.
- Accordingly, an object of the present invention is to provide a heat-dissipating device, wherein a stepped area is formed at a location where the liquid conduit is assembled with the chamber for gathering the liquid reflowing to the evaporating section after condensing, thereby the heat of the heating element will be absorbed continuously.
- In order to achieve the object mentioned above, the present invention provides a heat-dissipating device for contacting with a heating element. The heat-dissipating device includes a condenser and an evaporator. The condenser includes a shell and a main capillary wick. The shell has a chamber and a through hole communicating with the chamber, and the main capillary wick is disposed in the chamber. The evaporator includes an evaporating section having a gas cavity, a gas conduit communicating with the through hole, and a liquid conduit communicating with the chamber and filling with working fluid. The liquid conduit is inserted in the gas conduit and has a hole communicating with the gas cavity, and an outer surface of the evaporating section is contacted with the heating element; wherein a stepped area is formed at a location where the liquid conduit is assembled with the chamber, the liquid flows in the gas cavity and absorbs the heat generated from the heating element to be transformed into gas to flow in the chamber through the gas conduit, and the gas is transformed into the liquid and gathered in the stepped area by cooling the condenser for flowing in the liquid conduit.
- The present invention has the following effects. The liquid flows in the liquid conduit, and the gas flows in the gas conduit for achieving a flowing diversion effect. The liquid can be avoided from an affection of the gas when reflowing into the evaporating section, then a flowing resistance of the liquid and the gas can be reduced. The circulation speed of the liquid and the gas will be raised for a better heat dissipating effect of the heat sink.
- Because a cross section of the liquid conduit is smaller than a cross section of the gas conduit, an auto flowing diversion effect can be achieved by the principle of pressure difference for the liquid flowing into the liquid conduit and the gas flowing into the gas conduit.
- Further, the auxiliary evaporating section and the evaporating section are arranged in a line or disposed in a staggered manner; therefore, cooling for a plurality of heating elements at the same time can be achieved. Moreover, when the gas in the condenser is cooled and transformed into liquid, the liquid can flow quickly into the liquid conduit by an inclined plane of the chamber of the shell because of gravity. Thus, the cooling circulation of the liquid and the gas can be enhanced for a better cooling effect of the heat sink. Furthermore, a stepped area is formed at a location where the liquid conduit is assembled with the chamber for gathering the liquid reflow to the evaporating section after cooling. Thus, the effect for absorbing the heat generated from the heating element continuously is achieved.
- The features of the invention believed to be novel are set forth with particularity in the appended claims. The invention itself, however, may be best understood by reference to the following detailed description of the invention, which describes a number of exemplary embodiments of the invention, taken in conjunction with the accompanying drawings, in which:
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FIG. 1 is a perspective view of the first embodiment of the heat-dissipating device of the present invention; -
FIG. 2 is a partially exploded view of the first embodiment of the heat-dissipating device of the present invention; -
FIG. 3 is an exploded view of the condenser of the first embodiment of the present invention; -
FIG. 4 is a partially exploded view of the evaporator of the first embodiment of the heat-dissipating device of the present invention; -
FIG. 5 is a cross-sectional view of the first embodiment of the heat-dissipating device of the present invention after being assembled; -
FIG. 6 is a partially cross-sectional view of the condenser of the first embodiment of the heat-dissipating device of the present invention; -
FIG. 7 is a cross-sectional view of the evaporator of the first embodiment of the present invention; -
FIG. 8A is a schematic diagram of the first embodiment of the heat-dissipating device of the present invention while operating; -
FIG. 8B is another schematic diagram of the first embodiment of the heat-dissipating device of the present invention while operating; -
FIG. 8C is a schematic diagram of the protrusion of the evaporating section of the first embodiment of the present invention; -
FIG. 9 is a perspective view of the second embodiment of the heat-dissipating device of the present invention; -
FIG. 10 is an exploded view of the condenser of the second embodiment of the present invention as shown inFIG. 9 ; -
FIG. 11 is a cross-sectional view of the second embodiment of the heat-dissipating device of the present invention; -
FIG. 12 shows another type of the condenser of the heat-dissipating device of the present invention; -
FIG. 13 shows further another type of the condenser of the heat-dissipating device of the present invention; -
FIG. 14 is a perspective view of the third embodiment of the heat-dissipating device of the present invention; -
FIG. 15 is an exploded view of the condenser of the third embodiment of the heat-dissipating device of the present invention as shown inFIG. 15 ; -
FIG. 16 is a cross-sectional view of the condenser of the third embodiment of the present invention; -
FIG. 17 is an exploded view of the evaporator of the third embodiment of the present invention; -
FIG. 18 is a cross-sectional view of the third embodiment of the present invention. - In cooperation with attached drawings, the technical contents and detailed description of the invention are described thereinafter according to a number of preferable embodiments, being not used to limit its executing scope. Any equivalent variation and modification made according to appended claims is all covered by the claims claimed by the present invention.
- Please refer to
FIG. 1 toFIG. 4 showing the first embodiment of the heat-dissipating device of the present invention. The present invention provides a heat-dissipating device orthermosyphon heat sink 1 for contacting with a heating element. The heat-dissipatingdevice 1 includes acondenser 10 and anevaporator 20. - As shown in
FIGS. 1-3 , thecondenser 10 includes ashell 11, a maincapillary wick 12 and a heat-dissipatingbody 13. Theshell 11 has achamber 111 and a throughhole 112. The throughhole 112 communicating with thechamber 111 is provided at one side of theshell 11. The maincapillary wick 12 is disposed in thechamber 111. The maincapillary wick 12 can be a metal net or a plurality of heat-dissipating fins, or disposed on an inner surface of thechamber 111 by sintering of metal powder or sand blasting. Alternatively, the maincapillary wick 12 can be disposed at the inner wall of thechamber 111 and constituted by a foam material. Moreover, the maincapillary wick 12 can also be configured in a wavy shape or provided as heat-dissipating fins. Theheat dissipating bodies 13 are disposed on two opposite ends outside theshell 11, and the heat-dissipatingbodies 13 includes a plurality of heat-dissipatingfins 131 arranged at intervals. - As shown in
FIG. 3 , thecondenser 10 further includes a couple oflids 113. A couple ofentrances 110 communicating with thechamber 111 are disposed respectively at a front end and a back end of theshell 11. Eachlid 113 covers and seals theentrance 110. The throughhole 112 is disposed on one of thelids 113, and the throughhole 112 is communicated with thechamber 111. Thus, theshell 11 can be formed by extruding for facilitating the manufacturing process of theshell 11 and saving the manufacturing cost. Moreover, two sides of the bottom of thechamber 111 are formed with aninclined plane 114 respectively in a direction from an end of thelid 113 tilting toward the throughhole 112; therefore, the wall thickness of theshell 11 is not equal. - As shown in
FIG. 4 , theevaporator 20 includes an evaporatingsection 21, agas conduit 22, aliquid conduit 23, working fluid and anauxiliary capillary wick 25. An outer surface of the evaporatingsection 21 is connected with the heating element, and thegas conduit 22 is communicated with the throughhole 112 at an end near thecondenser 10. The evaporatingsection 21 has agas cavity 211 communicating with the throughhole 112, and theliquid conduit 23 communicating with thechamber 111 is filled with the working fluid. The working fluid can be, but not limited to, refrigerant or water etc. - The
gas conduit 22 and theliquid conduit 23 are, for example but not limited to, long elongated tubes. One side of the evaporatingsection 21 has anopening 212 and acover 213 corresponding to theopening 212. Theopening 212 is communicated with thegas cavity 211, and thecover 213 is formed with an embeddingslot 215 on a side near thegas cavity 211, and thecover 213 contacts with the heating element at a side away from the throughhole 212. Moreover, theliquid conduit 23 is inserted in thegas conduit 22 and disposed in thegas cavity 211, and thegas conduit 22 has ahole 231 communicating with thegas cavity 211. Preferably, a cross section of thegas conduit 22 is larger than that of theliquid conduit 23. - The
auxiliary capillary wick 25 is disposed in thegas cavity 211 of the evaporatingsection 21, and one side of theauxiliary capillary wick 25 is connected with the embeddingslot 215. Theauxiliary capillary wick 25 can be p a metal net or foam material disposed in the embeddingslot 215, or formed by a plurality of heat-dissipating fins or in the embeddingslot 215 by sand blasting. - In this embodiment, the
evaporator 20 further includes an auxiliary evaporatingsection 26 at a side of the evaporatingsection 21 away from thecondenser 10. The auxiliary evaporatingsection 26 and the evaporatingsection 21 are, but not limited to, in linear arrangement. The auxiliary evaporatingsection 26 further includes anauxiliary capillary wick 27. Thegas conduit 22 and theliquid conduit 23 are extended to the auxiliary evaporatingsection 26. In real practice, theauxiliary evaporating section 26 and the evaporatingsection 21 can be disposed in a staggered manner for cooling heating elements 9 in different positions to achieve the heat dissipation effect. - Please also refer to
FIG. 5 toFIG. 8C showing the condenser and the evaporator of the heat-dissipating device. Theliquid conduit 23 is inserted in thegas conduit 22 and disposed in thegas cavity 211. Besides, one end of theliquid conduit 23 near thecondenser 10 is extended and inserted in thechamber 111. - A stepped area 100 (refer to
FIG. 6 ) is formed in a location where theliquid conduit 23 is assembled in thechamber 111. The liquid 24 flows in thegas cavity 211 through thehole 231, and the liquid 24 is transformed intogas 241 by heat generated from the heating element in thegas cavity 211 and absorbed by the evaporatingsection 21. Thegas 241 flows to thechamber 111 through thegas conduit 22 and thegas 241 is transformed into the liquid 24 and gathered in the steppedarea 100 by cooling thecondenser 10 so that the liquid 24 flows into theliquid conduit 23. - In this embodiment, the stepped
area 100 is formed in an inner surface of thechamber 111 and located at a bottom of the maincapillary wick 12 correspondingly. Theliquid conduit 23 is disposed in the steppedarea 100. Preferably, the steppedarea 100 is located at the bottom of the center of thechamber 111 and formed as a storage space in thechamber 111. Thus the liquid 24 is gathered in thechamber 111. When thegas 241 in thecondenser 10 is cooled and transformed into the liquid 24, the liquid 24 can flow quickly from two sides of the bottom of the inner surface into the middle portion of the bottom of thechamber 11 by the gravity. Thus, the liquid 24 can flow into theliquid conduit 23 quickly, and the cooling circulation of the heat-dissipatingdevice 1 will be enhanced for improving the cooling effect of the heat-dissipatingdevice 1. - As shown in
FIG. 7 , arib 235 is extended between an inner surface of thegas conduit 22 and an outer surface of theliquid conduit 23. Thus, thegas conduit 22 and theliquid conduit 23 can be formed as a single piece by aluminum extruding process. - Please also refer to
FIG. 8A andFIG. 8B . When the heat-dissipatingdevice 1 of the present invention is in use, the liquid 24 in theliquid conduit 23 flows into the evaporatingsection 21 through thehole 231 of theliquid conduit 23. Meanwhile, the heat of the heating element 9 will be conducted to theauxiliary capillary wick 25 through thecover 213. The heat can be transferred to the liquid 24 by theauxiliary capillary wick 25 that enlarges the contacting areas with the liquid 24 in thegas cavity 211. When the liquid 24 absorbs the heat of theauxiliary capillary wick 25 and transforms into thegas 241, thegas 241 will flow in thechamber 111 of theshell 11 through thegas conduit 22. - After the main
capillary wick 12 absorbing the heat of thegas 241 in thechamber 111, the heat can be transferred to theshell 11 through the maincapillary wick 12, and theshell 11 will conduct the heat to the heat-dissipatingbody 13. The heat accumulated in the heat-dissipatingbody 13 will be dissipated to air through heat exchanging with air by the heat-dissipatingfins 131. Thegas 241 in thechamber 111 will transform into the liquid 24 and flow into theliquid conduit 23 for next cooling circulation. Thus an effect of cooling heating element will be achieved. - A flowing path between the liquid 24 and the
gas 241 can be decreased by disposing theliquid conduit 23 in thegas conduit 22. The liquid 24 flowing in theliquid conduit 23 with a smaller cross section has a low pressure. Thegas 241 flowing in thegas conduit 22 with a larger cross section has a high pressure. Therefore, the liquid 24 and thegas 241 will achieve a flowing diversion effect. The liquid 24 can be avoided from an affection of thegas 241 when reflowing into the evaporatingsection 21 so as to reduce the flowing resistance of the liquid 24 and thegas 241. The circulation speed of the liquid 24 and thegas 241 will be raised for a better heat dissipating effect of the heat-dissipating device. - In addition, effects of reducing the volume and simplifying the manufacturing process and the assembly procedure can be achieved by the heat-dissipating
bodies 13 connected with theshell 11 in an upper end or a lower end and theliquid conduit 23 inserted in thegas conduit 22. Thereby, the cost of the manufacturing and the material will be reduced. - In this embodiment, the
lid 213 of the evaporatingsection 21 has aprotrusion 214 at a side away from thegas cavity 211, and theprotrusion 214 is in thermal contact with the heating element. Besides, theopening 212 of the evaporatingsection 21 and thelid 213 can be omitted by protruding the wall of the evaporatingsection 21. In other words, thelid 213 can be removed and aprotrusion 214′ can be formed with the evaporatingsection 21 as a single piece shown inFIG. 8C . - Please refer to
FIG. 9 toFIG. 11 showing the second embodiment of the heat-dissipating device of the present invention. The heat-dissipatingdevice 1 a includes acondenser 10 a and an evaporator 20 a. Thecondenser 10 a includes ashell 11 a, a maincapillary wick 12 a and a heat-dissipatingbody 13 a. Theshell 11 a has achamber 111 a and a throughhole 112 a. The evaporator 20 a includes an evaporatingsection 21 a, agas conduit 22 a, aliquid conduit 23 a, a working fluid and anauxiliary capillary wick 25 a. - A difference between the present embodiment and the first embodiment is that the
condenser 10 a in the present embodiment further includes a couple oflids 113 a. A couple ofentrances 110 a communicating with thechamber 111 a are disposed at the left end and right end of theshell 11 a. Eachlid 113 a covers and seals theentrance 110 a of theshell 11 a. Theshell 11 a can be formed by extruding for simplifying the manufacturing process and saving the cost of theshell 11 a. - Moreover, another difference between the present embodiment and the first embodiment is that an
inclined plane 114 a is formed at the bottom of thechamber 111 a of theshell 11 a at a side away from the throughhole 112 a and tilted toward the throughhole 112 a. A top plane of thechamber 11 a is, preferably but not limited to, parallel to theinclined plane 114 a. The wall of theshell 11 a has an unequal thickness preferably. When the gas in thecondenser 10 a is cooled and transformed into the liquid, the liquid can flow quickly along theinclined plane 114 a of thechamber 111 a into theliquid conduit 23 a by the gravity. Thus, the cooling circulation of the heat-dissipatingdevice 1 a will be enhanced for improving the cooling effect thereof. - As shown in
FIG. 11 , a further difference between this embodiment and the first embodiment is that one end of theliquid conduit 23 a in this embodiment is located in the throughhole 112 a. The stepped area is formed between aninner surface 1110 a of thechamber 111 a and aninner surface 230 a of theliquid conduit 23 a. - Please further refer to
FIG. 12 showing another type of the condenser of the first and second embodiments. Thecondenser 10 b includes ashell 11 b, a maincapillary wick 12 b and a heat-dissipating body (not shown). A difference between the present embodiment with the first embodiment and the second embodiment is that theshell 11 b is in one-piece form by bending a metal plate. - The
shell 11 b has achamber 111 b, and a steppedarea 100 b is provided at the bottom of the center of thechamber 111 b. The maincapillary wick 12 b can be a metal net or disposed on an inner surface of thechamber 111 b by sintering of metal powder or sand blasting. Moreover, it can also be constituted by a foam material. Moreover, two sides of the bottom of thechamber 111 b of theshell 11 b are formed with aninclined plane 114 b tilted from two sides of theshell 11 b toward the center of the bottom respectively. Theinclined plane 114 b is formed by bending theshell 11 b directly. - Please further refer to
FIG. 13 showing another type of the condenser of the first and second embodiments. The structures of the present embodiment are substantially the same as the above-described embodiments. Thecondenser 10 c includes ashell 11 c, a maincapillary wick 12 c and a heat-dissipating body (not shown), wherein theshell 11 c is in one-piece form by bending a metal plate. A difference between this embodiment and the above-described embodiments is that two sides of the bottom of thechamber 111 c of theshell 11 c are formed with aninclined plane 114 c extended and tilted from two sides of theshell 11 c toward the center of the bottom respectively, and a steppedarea 100 c is provided at the bottom of the center of thechamber 111 c. Theinclined plane 114 c is configured by disposing twooblique plates 13 c at two sides of thechamber 111 c of theshell 11 c and neighboring the steppedarea 100 c, respectively. - Please also refer to
FIG. 14 toFIG. 17 showing the third embodiment of the heat-dissipating device of the present invention. Thecondenser 10 d includes ashell 11 d and a maincapillary wick 12 d. Theshell 11 d has achamber 111 d and a throughhole 112 d communicating with thechamber 111 d at a side of theshell 11 d. The maincapillary wick 12 d is disposed in thechamber 111 d. As shown inFIG. 15 andFIG. 16 , the maincapillary wick 12 d includes a plurality of fins protruded from a top inner surface of thechamber 111 d to the bottom of an inner surface of thechamber 111 d. - As shown in
FIG. 17 , theevaporator 20 d includes an evaporatingsection 21 d with agas cavity 211 d, agas conduit 22 d communicating with the throughhole 112 d, and aliquid conduit 23 d communicating with thechamber 111 d and filling with liquid. Theliquid conduit 23 d is inserted in thegas conduit 22 d and has ahole 231 d communicating with thegas cavity 211 d. An outer surface of the evaporatingsection 21 d is contacted with the heating element. - Moreover, a location where the
liquid conduit 23 d inserted in thechamber 111 d is formed with a steppedarea 100 d. The liquid flows into thegas cavity 211 d through thehole 231 d, and the liquid transforms into gas by absorbing the heat of the heating element through the evaporatingsection 21 d. The gas flows into thechamber 111 d through thegas conduit 22 d and is transformed into liquid through thecondenser 10 d for gathering in the steppedarea 100 d and flowing into theliquid conduit 23 d. - In this embodiment, the stepped
area 100 d is formed in an inner surface of thechamber 111 d and located at the bottom of the maincapillary wick 12 d correspondingly. Theliquid conduit 23 d is disposed on the steppedarea 100 d. The steppedarea 100 d is located at the bottom of the center of thechamber 111 d for gathering the liquid in thechamber 111 d. - Please refer to
FIG. 18 showing the cross-sectional view of the heat-dissipating device of the present invention. A difference between the present embodiment and the first embodiment is that an end ofliquid conduit 23 d in the present embodiment is located in the throughhole 112 d. The steppedarea 100 d′ is formed between aninner surface 1110 d of thechamber 111 d and aninner surface 230 d of theliquid conduit 23 d. - It is worth notice that the structures of evaporator and condenser in various types can be applied in different embodiments of the heat-dissipating device of the present invention as needed.
- In conclusion, the gas flow and the gas flow are disposed in the same component of the heat-dissipating device of the present invention for reducing the module volume and the total cost. Besides, the liquid conduit of the heat-dissipating device of the present invention is assembled with the chamber to form a stepped area. Thus, the liquid after cooling can reflow to the middle zone of the condenser easily by the gravity. A storage can be made for storing the liquid. Therefore, the evaporated liquid due to heat absorption in the evaporator end can be rapidly supplemented for enhancing the heat transfer efficiency.
- Although the present invention has been described with reference to the preferred embodiment thereof, it will be understood that the invention is not limited to the details thereof. Various substitutions and improvements have been suggested in the foregoing description, and others will occur to those of ordinary skill in the art. Therefore, all such substitutions and improvements are intended to be embraced within the scope of the invention as defined in the appended claims.
Claims (21)
1. A heat-dissipating device for contacting with a heating element, comprising:
a condenser comprising a shell having a chamber and a through hole communicating with the chamber, and a main capillary wick disposed in the chamber; and
an evaporator comprising an evaporating section having a gas cavity, a gas conduit communicating with the through hole, and a liquid conduit communicating with the chamber and filling with liquid, wherein the liquid conduit is inserted in the gas conduit and has a hole communicating with the gas cavity, and an outer surface of the evaporating section is contacted with the heating element;
wherein a stepped area is formed at a location where the liquid conduit is assembled with the chamber, the liquid flows in the gas cavity and absorbs the heat generated from the heating element to be transformed into gas and flows in the chamber through the gas conduit, the gas is transformed into the liquid, gathered in the stepped area by cooling of the condenser and flows into the liquid conduit.
2. The heat-dissipating device according to claim 1 , wherein the evaporator further comprises an auxiliary evaporating section at a side of the evaporating section away from the condenser, the evaporating section and the auxiliary evaporating section are arranged in a line or disposed in a staggered manner, and the gas conduit and the liquid conduit are extended to the auxiliary evaporating section.
3. The heat-dissipating device according to claim 1 , wherein the evaporating section has an opening and a cover corresponding to the opening, the opening is communicated with the gas cavity, the cover has a protrusion at a side away from the opening, and the protrusion is contacted with the heating element.
4. The heat-dissipating device according to claim 3 , wherein the auxiliary evaporating section further includes an auxiliary capillary wick, the cover is formed with an embedding slot at a side near the gas cavity, the auxiliary capillary wick comprises a plurality of heat-dissipating fins, a metal net disposed in the embedding slot, a component made of foam, or formed in the embedding slot of the cover by sand blasting.
5. The heat-dissipating device according to claim 1 , wherein a protrusion is protruded from a wall of the evaporating section and formed with the evaporating section as a single piece.
6. The heat-dissipating device according to claim 1 , wherein a side of the liquid conduit is connected with an inner surface of the gas conduit.
7. The heat-dissipating device according to claim 1 , wherein a cross section of the gas conduit is greater than a cross section of the liquid conduit.
8. The heat-dissipating device according to claim 1 , wherein the condenser further comprises a lid, an entrance communicating with the chamber and disposed at a side of the shell, and the entrance is sealed by the lid .
9. The heat-dissipating device according to claim 1 , wherein a bottom of an inner surface of the chamber is formed with an inclined plane from a side away and tilted from the through hole toward the through hole.
10. The heat-dissipating device according to claim 1 , wherein two sides of the bottom of the chamber are formed with an inclined plane from a side away and tilted from the through hole toward the through hole respectively.
11. The heat-dissipating device according to claim 1 , wherein a rib is extended between an inner surface of the gas conduit and an outer surface of the liquid conduit.
12. The heat-dissipating device according to claim 1 , wherein the condenser further comprises a heat-dissipating body disposed at an upper end or a lower end of the shell.
13. The heat-dissipating device according to claim 12 , wherein the heat-dissipating body comprises a plurality of heat-dissipating fins arranged at intervals.
14. The heat-dissipating device according to claim 1 , wherein the main capillary wick is a metal net or comprises a plurality of heat-dissipating fins disposed on an inner surface of the chamber.
15. The heat-dissipating device according to claim 1 , wherein the main capillary wick is configured in a waved shape.
16. The heat-dissipating device according to claim 1 , wherein the stepped area is formed in an inner surface of the chamber and correspondingly located on a bottom of the main capillary wick.
17. The heat-dissipating device according to claim 16 , wherein the stepped area is located at the bottom of the center of the chamber and formed as a storage space in the chamber.
18. The heat-dissipating device according to claim 1 , wherein an end of the liquid conduit is positioned in the through hole, and the stepped area is formed between an inner surface of the chamber and an inner surface of the liquid conduit.
19. The heat-dissipating device according to claim 1 , wherein the shell is in one-piece form by bending a metal plate.
20. The heat-dissipating device according to claim 19 , wherein a bottom of an inner surface of the chamber of the shell is formed with an inclined plane from a side away from the through hole and tilted toward the through hole, and the inclined plane is in one-piece form from bending of shell.
21. The heat-dissipating device according to claim 19 , wherein the shell further includes two oblique plates and an inclined plane, the inclined plane is formed on a bottom of an inner surface of the chamber from a side away from the through hole and tilted toward the through hole, and the two oblique plates are disposed on two sides of the chamber of the shell and neighboring the stepped area to form the inclined plane.
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CN107835617A (en) * | 2017-11-01 | 2018-03-23 | 深圳兴奇宏科技有限公司 | Loop heat pipe structure |
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Cited By (5)
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US11236948B2 (en) | 2016-08-24 | 2022-02-01 | Delta Electronics, Inc. | Heat dissipation assembly |
US20220120510A1 (en) * | 2016-08-24 | 2022-04-21 | Delta Electronics, Inc. | Heat dissipation assembly |
US11549760B2 (en) * | 2016-08-24 | 2023-01-10 | Delta Electronics, Inc. | Heat dissipation assembly |
US11092383B2 (en) * | 2019-01-18 | 2021-08-17 | Asia Vital Components Co., Ltd. | Heat dissipation device |
US10969837B1 (en) * | 2019-11-06 | 2021-04-06 | Hongfujin Precision Electronics(Tianjin)Co., Ltd. | Heat sink and electronic device having same |
Also Published As
Publication number | Publication date |
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US11486652B2 (en) | 2022-11-01 |
CN103813695B (en) | 2016-08-17 |
CN103813695A (en) | 2014-05-21 |
US20190339023A1 (en) | 2019-11-07 |
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