CN105222631A - A kind of loop circuit heat pipe composite liquid sucking core - Google Patents
A kind of loop circuit heat pipe composite liquid sucking core Download PDFInfo
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- CN105222631A CN105222631A CN201510741906.3A CN201510741906A CN105222631A CN 105222631 A CN105222631 A CN 105222631A CN 201510741906 A CN201510741906 A CN 201510741906A CN 105222631 A CN105222631 A CN 105222631A
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- heat pipe
- loop circuit
- bead
- circuit heat
- phase transformation
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Abstract
The invention discloses a kind of loop circuit heat pipe composite liquid sucking core.The present invention is made up of metal dust, phase transformation bead and hole; The metal dust of described metal dust to be diameter be 25-150 micron; Described phase transformation bead is made up of the phase-change material in phase transformation bead shell and shell, and the diameter of described phase transformation bead is 1-3mm; The solid-liquid phase change temperature of described phase-change material is lower than the boiling point of working medium in loop circuit heat pipe 3 DEG C; The size of described hole is realized by the control metal dust of different-grain diameter and the ratio of phase transformation bead.The present invention can effectively avoid loop circuit heat pipe initial start stage due to evaporator shell body drain heat and liquid-sucking core conduction effect dorsad and cause loop circuit heat pipe startup failure, be conducive to the smooth startup of loop circuit heat pipe, improve loop circuit heat pipe operation stability.
Description
Technical field
The present invention relates to Thermal Power Engineering technical field, in particular, relate to a kind of loop circuit heat pipe composite liquid sucking core.
Background technology
Loop circuit heat pipe is widely used in the cooling heat dissipation of high heat flux device in the fields such as Aero-Space, great power LED and large server.Loop circuit heat pipe is that the draft of a kind of dependence capillary drives, the enclosed two-phase circulating heat transfer device utilizing phase transformation to carry out conducting heat.The evaporimeter of loop circuit heat pipe and condenser are two parts of relative separation, thus according to the position of practical application flexible arrangement evaporimeter and condenser, and can form loop by steam connecting leg and liquid connecting leg.But loop circuit heat pipe itself also exists many deficiencies, main manifestations is two aspects: be the heat conduction of sidewall and the leakage heat of liquid-sucking core on the one hand, is that liquid-sucking core backflow resistance and capillary head can not be taken into account on the other hand.First, a part can via sidewall to liquid-sucking core and compensated cavity transmission from the heat of base plate, some heat another can be revealed to compensated cavity by liquid-sucking core, above-mentioned damaging heat transmission is mainly because the inherent structure of loop heat pipe evaporator causes, liquid-sucking core and compensated cavity inner loop working medium can be caused to produce phase transformation, thus compensated cavity and evaporation cavity cannot set up the pressure reduction needed for circulation, easily cause the startup failure of loop circuit heat pipe.In addition, tradition liquid-sucking core due to particle diameter single, make liquid-sucking core well can not take into account larger capillary head and less backflow resistance simultaneously, although the composite liquid sucking core of existing different-grain diameter appears at theoretical research field, the technological process of complexity and manufacturing cost limit the further application of loop circuit heat pipe.
Summary of the invention
The object of the present invention is to provide a kind of loop circuit heat pipe composite liquid sucking core, have that capillary head is large, backflow resistance is little, and can effectively avoid loop circuit heat pipe to cause the startup of loop circuit heat pipe unsuccessfully in initial start stage due to the conduction effect dorsad of evaporator shell body drain heat and liquid-sucking core.
The technical scheme adopted for realizing object of the present invention is:
A kind of loop circuit heat pipe composite liquid sucking core, is made up of metal dust, phase transformation bead and hole; The metal dust of described metal dust to be diameter be 25-150 micron; Described phase transformation bead is made up of the phase-change material in phase transformation bead shell and shell, and the diameter of described phase transformation bead is 1-3mm; The solid-liquid phase change temperature of described phase-change material is lower than the boiling point of working medium in loop circuit heat pipe 3 DEG C; The size of described hole is realized by the control metal dust of different-grain diameter and the ratio of phase transformation bead.
Described metal dust is copper powder or nickel powder.
Described phase transformation bead shell selects nickel to be its composition material.
The paraffin reaching required setting phase transition temperature by controlling molecular weight selected by described phase-change material.
Compared with prior art, the invention has the beneficial effects as follows:
The setting of composite liquid sucking core can effectively avoid loop circuit heat pipe to cause the startup of loop circuit heat pipe unsuccessfully in initial start stage due to the conduction effect dorsad of evaporator shell body drain heat and liquid-sucking core, be conducive to the smooth startup of loop circuit heat pipe, improve the stability that loop circuit heat pipe runs; Composite liquid sucking core is at it while micro-channel side has larger capillary head, and overall structure has the little feature of backflow resistance; And composite liquid sucking core manufacture process craft is relatively simple, use copper powder size to have uniformity, cheap
Accompanying drawing explanation
Figure 1 shows that the loop heat pipe principle figure of band composite liquid sucking core;
Figure 2 shows that the structural representation of a kind of loop circuit heat pipe composite liquid sucking core of the present invention;
In figure: 1. metal dust, 2. phase transformation bead, 3. phase transformation bead shell, 4. hole, 5. phase-change material, 6. base plate, 7. shell, 8. micro-channel, 9. vapor flowing space, 10. steam connecting leg, 11. condensers, 12. liquid connecting legs, 13. compensated cavities, 14. mixed layers, 15. copper powder layers.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Refer to Fig. 1-Fig. 2, a kind of loop circuit heat pipe composite liquid sucking core of the present invention is made up of metal dust 1, phase transformation bead 2 and hole 4; Described metal dust 1 is the metal dust of 25-150 micron for diameter, can be copper powder or nickel powder, and the preferred copper powder of the present invention is as the material of liquid-sucking core; Described phase transformation bead 2 is made up of phase transformation bead shell 3 and phase-change material 5, and the diameter of described phase transformation bead 2 is 1-3mm, and the preferred nickel of described phase transformation bead shell 3 is its composition material; The selection of described phase-change material 5 should according to the actual motion thermal creep stress of loop circuit heat pipe, and the solid-liquid phase change temperature of described phase-change material 5 should be lower than the boiling point of working medium in loop circuit heat pipe about 3 DEG C, the present invention preferably reaches the phase-change material of paraffin as described phase-change material 5 of required setting phase transition temperature by controlling molecular weight.Described metal dust 1 and described phase transformation bead 2 mix and form hole 4 each other after oversinterings, and the size of described hole 4 is by realizing at the different metal dust 1 of liquid-sucking core position control different-grain diameter and the ratio of phase transformation bead 2.
As embodiment, select the paraffin with certain solid-liquid phase change temperature to fill in described phase transformation bead shell 3 and seal, obtaining described phase transformation bead 2.To get particle diameter be the copper powder of 75 microns and the described phase transformation bead of 3mm diameter is raw materials for sintering, first in the sintering mold with circle or rectangle, put into above-mentioned copper powder and pave extruding and form described copper powder layer 15, on the copper powder layer paved, put into the mixture with a certain proportion of copper powder and phase transformation bead 2 again, carry out compression equally and form described mixed layer 14 and cover sintering particular manufacturing craft.Mould is put into high temperature sintering furnace sinter, sintering time controls between 60-90 minute, finally treats that furnace temperature is cooled to room temperature, removes the loop circuit heat pipe composite liquid sucking core that mould can obtain required form.Composite liquid sucking core is put into described shell 7, and the described micro-channel 8 on the bottom of composite liquid sucking core and described base plate 6 is fitted tightly, the bottom of described micro-channel 8 and described composite liquid sucking core forms described vapor flowing space 9, and the upper surface of described composite liquid sucking core and described shell 7 constitute described compensated cavity 13.The outlet of described vapor flowing space 9 is connected with described steam connecting leg 10, and described steam connecting leg outlet is connected with the import of described condenser 11, is connected with described liquid connecting leg 12 between the outlet of described condenser 11 and described compensated cavity 13.On the one hand, because the diameter of copper powder and described phase transformation bead 2 is inconsistent, thus between copper powder, sintering will form little space, sinter and will form larger hole between described phase transformation bead 2 and copper powder.On the other hand, the described copper powder layer 15 contacted with described micro-channel due to the bottom of composite liquid sucking core again sinters for full copper powder, therefore the described copper powder layer 15 near micro-channel has less porosity and larger capillary head, and the described mixed layer 14 near described compensated cavity 13 side is obtained by copper powder and described phase transformation bead 2 mixed sintering, thus porosity is relatively large, flow resistance is little.Loop circuit heat pipe start and variable parameter operation time, because thermic load changes, a part of heat will be passed to the top of described liquid-sucking core by described base plate 6 by described micro-channel 8 and described shell 7 and cause the rising of surrounding loop Temperature of Working.This partial heat is taken away owing to not being recycled Working fluid phase changing evaporation and being stayed in liquid-sucking core and described compensated cavity 13, when liquid-sucking core top will cause loop circuit heat pipe to start unsuccessfully prior to producing liquid-gas phase transition interface around described micro-channel 8 and wick contacts face.In the present embodiment, when heat is passed to the top of composite liquid sucking core by described shell 7 and described micro-channel 8, because the thawing of being heated of the solid in described phase transformation bead 2 becomes liquid, the temperature on liquid-sucking core top will be controlled in lower than working medium boiling point about 3 DEG C, ensure that liquid-sucking core can not prior to first producing liquid-gas phase transition interface near described micro-channel and wick contacts face, after loop circuit heat pipe successfully starts, under the condensate liquid cooling effect of backflow, liquid phase-change working medium is solidified again.In general, composite liquid sucking core be provided with the smooth startup being beneficial to loop circuit heat pipe, improve loop circuit heat pipe run stability; Composite liquid sucking core is at it while micro-channel side has larger capillary head, and overall structure is arranged has the little feature of backflow resistance; Composite liquid sucking core manufacture process craft is relatively simple, use copper powder size to have uniformity, cheap.
Below introduce a kind of several embodiments heating EGR and control method thereof of the present invention; the following stated is only the preferred embodiment of the present invention; it should be noted that; for those skilled in the art; under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
1. a loop circuit heat pipe composite liquid sucking core, is characterized in that, is made up of metal dust, phase transformation bead and hole; The metal dust of described metal dust to be diameter be 25-150 micron; Described phase transformation bead is made up of the phase-change material in phase transformation bead shell and shell, and the diameter of described phase transformation bead is 1-3mm; The solid-liquid phase change temperature of described phase-change material is lower than the boiling point of working medium in loop circuit heat pipe 3 DEG C; The size of described hole is realized by the control metal dust of different-grain diameter and the ratio of phase transformation bead.
2. loop circuit heat pipe composite liquid sucking core according to claim 1, is characterized in that, described metal dust is copper powder or nickel powder.
3. loop circuit heat pipe composite liquid sucking core according to claim 1, is characterized in that, described phase transformation bead shell selects nickel to be its composition material.
4. loop circuit heat pipe composite liquid sucking core according to claim 1, is characterized in that, the paraffin reaching required setting phase transition temperature by controlling molecular weight selected by described phase-change material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510741906.3A CN105222631A (en) | 2015-11-04 | 2015-11-04 | A kind of loop circuit heat pipe composite liquid sucking core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510741906.3A CN105222631A (en) | 2015-11-04 | 2015-11-04 | A kind of loop circuit heat pipe composite liquid sucking core |
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| Publication Number | Publication Date |
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| CN105222631A true CN105222631A (en) | 2016-01-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510741906.3A Pending CN105222631A (en) | 2015-11-04 | 2015-11-04 | A kind of loop circuit heat pipe composite liquid sucking core |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106767070A (en) * | 2017-01-12 | 2017-05-31 | 山东大学 | A kind of flat type loop heat pipe evaporator and loop circuit heat pipe |
| CN110303153A (en) * | 2019-06-28 | 2019-10-08 | 安泰环境工程技术有限公司 | A kind of processing method of capillary wick and its assembly method with shell |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002022379A (en) * | 2000-07-06 | 2002-01-23 | Showa Denko Kk | Heat pipe |
| CN201754050U (en) * | 2010-08-19 | 2011-03-02 | 中冶南方工程技术有限公司 | Flat plate type loop hot pipe |
| CN102829662A (en) * | 2012-08-16 | 2012-12-19 | 圣火科技(河南)有限责任公司 | Rotary phase-change heat storage device |
| CN205102649U (en) * | 2015-11-04 | 2016-03-23 | 天津商业大学 | Loop heat pipe is with compound imbibition core |
-
2015
- 2015-11-04 CN CN201510741906.3A patent/CN105222631A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002022379A (en) * | 2000-07-06 | 2002-01-23 | Showa Denko Kk | Heat pipe |
| CN201754050U (en) * | 2010-08-19 | 2011-03-02 | 中冶南方工程技术有限公司 | Flat plate type loop hot pipe |
| CN102829662A (en) * | 2012-08-16 | 2012-12-19 | 圣火科技(河南)有限责任公司 | Rotary phase-change heat storage device |
| CN205102649U (en) * | 2015-11-04 | 2016-03-23 | 天津商业大学 | Loop heat pipe is with compound imbibition core |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106767070A (en) * | 2017-01-12 | 2017-05-31 | 山东大学 | A kind of flat type loop heat pipe evaporator and loop circuit heat pipe |
| CN110303153A (en) * | 2019-06-28 | 2019-10-08 | 安泰环境工程技术有限公司 | A kind of processing method of capillary wick and its assembly method with shell |
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Application publication date: 20160106 |