CN1192202C

CN1192202C - Plate loop heat pipe (I)

Info

Publication number: CN1192202C
Application number: CNB011311983A
Authority: CN
Inventors: 李嘉豪
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-09-06
Filing date: 2001-09-06
Publication date: 2005-03-09
Anticipated expiration: 2021-09-06
Also published as: CN1403777A

Abstract

The present invention relates to a flat plate loop type heat pipe. At least one annular loop plate is arranged in a hollow shell body so that the annular loop plate is provided with at least one loop; the loop is formed in the way that an evaporating zone, a steam channel, a condensing zone and a fluid returning channel are orderly connected in series. The shell body is filled with a proper amount of liquid. The fluid returning channel and the steam channel are respectively separate channels. The annular loop plate is covered by a plate-shaped capillary tissue; the flow resistance of the steam channel is smaller than that of the fluid returning channel. When the evaporating zone is heated, and the condensing zone dissipates heat, all fluids in the loop are made to stably flow in the same direction without conflicts. All the fluids can flow across each part of the loop, so non-condensable gas which exists in the loop flows along the loop, and has little effect on the temperature equalizing performance of the loop so that the heat pipe has excellent temperature equalizing performance and large heat transferring amount.

Description

Flat type loop type heat pipe (one)

Technical field

The invention belongs to a kind of flat type loop type heat pipe, relate to particularly that a kind of hot biography amount is big, uniform temperature is good, and for the not concretive gas heat exchange structure little to the circuit system properties influence that exists in the tabular heat pipe.

Background technology

Existing heat pipe, owing to have goodish heat transmitting, be widely used in the radiating subassembly of electronic building brick, the radiating subassembly of heat pipe-type has a heat pipe 1 usually, be provided with a heat-conducting block 11 in the electronic building brick end, heat-conducting block 11 joins with an end of heat pipe 1, and the other end of heat pipe 1 can join through another heat-conducting block and heat-exchange device, or heat pipe 1 other end directly is folded with several radiating fins 12, shown in Fig. 1, promptly be the heat pipe of radiating fin 12 formulas.

The manufacturing of heat pipe, it is to be used for the interior cleaning of heat pipe and the step of degasification that quite high a part of cost is arranged, just carry out operation clean and that vacuumize in the heat pipe, cleanliness factor and vacuum are high more, the heat transfer effect effect that can finish is good more, can guarantee heat conducting stability more, but, the not concretive gas (non-condensing gas) that still has trace in the passage, in the passage of not concretive gas in heat pipe, can produce and gather, the evaporating area temperature difference of zone that it gathers and heating end is very big, just has influence on the smoothness of heat pipe effect.Wherein not concretive gas is easy to be accumulated in the end at condensing zone passage place, can decline to a great extent and its uniform temperature and heat are passed on Gong.

Heat pipe 1 provides the generation of steam flow for the evaporating area of hot-zone in heat-conducting block 11, making steam flow is that the condensing zone of cold-zone flows along passage towards the other end, make the steam flow condensation form condensate liquid stream then at the passage place of cold-zone, relend the capillary structure 13 that helps in the passage apace with condensate liquid stream by the cold-zone towards the hot-zone pilot flow, flash to the part of gas in order to replenish evaporating area liquid, to constitute flowing of circulation.

When heat pipe 1 one ends are heated and make liquid evaporation in the heat pipe, steam flows towards condensing zone, and be condensed into liquid, make liquid be back to evaporating area through capillary structure, because the fluid of heat pipe comes and goes the loop for being arranged in the same passage, steam flow is conflicted in this passage mutually with the flow direction of liquid stream, and hot biography amount is reduced, and not concretive gas remaining in the passage lodges in condensing zone, forms the big zone of the temperature difference, has reduced uniform temperature, heat transfer property thereby also significantly reduction, so therefore creating conditions and keep all being strict with of opposite heat tube significantly improve cost traditionally, price rises, quite do not meet economy, for the article of more realistic demand are provided, the inventor researches and develops, to solve the existing not good problem of its heat transfer property of heat pipe.

Summary of the invention

Technical problem to be solved by this invention is to be to provide a kind of flat type loop type heat pipe, in tabular heat pipe, form the structure of multiple field and multichannel and multiloop formula, with evaporating area, steam channel, condensing zone, fluid return passage is connected into a loop in regular turn, the wherein above setting parallel with one another of steam channel single passage of possibility or two passages, fluid return passage also can be with single passage or setting parallel with one another more than two passages, just form the string of single loop formula, the framework of combination in parallel, promptly form more efficient heat-exchange device, the loop mainly is the guide function that utilizes the passage flow resistance different, the flow resistance that is steam channel is less than fluid return passage, allow fluid in the loop produce automatically cyclicity and stable folk prescription to and the flowing of equidirectional.Dryout the phenomenon generation thereby tabular heat pipe is had hardly,, great hot biography amount can be arranged under the confined space so can produce good heat transmitting.In the passage the steam flow that forms and the liquid stream of condensation be all along same direction and flow and do not conflict mutually: and each loop on the same plane can form inhomogeneous configuration status, to adapt to actual demand.

Another purpose of the present invention is to provide a kind of above-mentioned flat type loop type heat pipe, be under the preceding topic with the consideration of economy, can carry out the manufacturing of tabular heat pipe with low cost, but still keep the heat transfer function of tabular heat pipe, and can produce guiding faster, guiding on utilization asymmetric phenomenon of loop internal channel hot-fluid and the loop structure, make the steam channel in the heat exchange, condensing zone, fluid return passage, evaporating area series loop in regular turn become the passage of circulation shape, can make the interior existing not concretive gas of housing can't fixedly accumulate in the condensing zone of passage, and allow not concretive gas constantly circulate according to design direction along passage, significantly improve the uniform temperature of tabular heat pipe, so even not concretive gas is arranged in the housing of tabular heat pipe, functional characteristic to tabular heat pipe all influences not quite, and can prolong the service life of tabular heat pipe.

For achieving the above object, structure of the present invention is: comprise a housing and ring of numbers shape circuit board, be arranged in the hollow housing with at least one cyclic loop plate, allow the cyclic loop plate have at least one loop, the loop forms the evaporating area of series connection in regular turn, steam channel, condensing zone, fluid return passage, and in housing, be filled with appropriate amount of fluid, fluid return passage is to each have its independent and not shared mutually passage with steam channel, and be covered with tabular capillary structure in the cyclic loop plate, and the flow resistance that makes steam channel is less than fluid return passage, when evaporating area is heated, the condensing zone heat radiation, make not conflict mutually of fluids all in loop steady flow all in the same direction, and all fluids all can be flowed through the loop everywhere, so the not concretive gas that exists in the loop is little to the uniform temperature influence in loop, and along loop flow, and it is good to make the loop hot plate become uniform temperature, and the great heat-exchange device of hot biography amount.Wherein steam channel can be to be arranged in parallel more than two passages, and fluid return passage can be to be arranged in parallel more than two passages.

For explaining that better the present invention reaches technology, means and the effect that predetermined purpose is taked, below in conjunction with the embodiments of the invention that accompanying drawing is described in detail, believe purpose of the present invention, feature and advantage, can be goed deep into thus and concrete understanding.

Description of drawings

Fig. 1 is the cutaway view of prior art scheme;

Fig. 2 is a three-dimensional exploded view of the present invention;

Fig. 3 is the last parallax stereogram behind the first cyclic loop plate turn-over among Fig. 2;

Fig. 4 is the first cyclic loop plate last parallax stereogram of turn-over not among Fig. 2;

Fig. 5 is the top view of the second cyclic loop plate among Fig. 2;

Fig. 6 is the cutaway view after the present invention's combination among Fig. 2;

Fig. 7 is the flow schematic diagram of the first cyclic loop fluid among Fig. 2;

Specific embodiment

Fig. 2,3,4,5,6 and Fig. 7 in, one embodiment of the present of invention are a kind of loop heat pipe, have a housing 3, it is the hollow obturator for a housing 3, and is filled with appropriate amount of fluid in housing 3.The charging quantity of liquid is meant the capacity of inserting liquid that fills up the 80-90% of the volume of first each loop inner gateway of cyclic loop plate in interior capillary structure of housing and the loop.

Have at least one first cyclic loop plate 5 that is the empty shape of Lou and be second cyclic loop 4 of the empty shape of Lou with at least one, each cyclic loop plate the 4, the 5th is arranged in the housing 3, and form in housing 3 with cyclic loop plate 4 and to have at least one loop 2, loop 2 is with empty each passage that forms of Lou, housing 3 wherein is made up of top shell 31 and drain pan 32, with the periphery of the periphery of top shell 31 and the drain pan 32 airtight formation housing 3 afterwards that joins.Wherein the cyclic loop plate can only be established wherein one, or be arranged to two mutually stacked, can be with Fig. 3 and state shown in Figure 4, directly foldedly mutually form another combination.

Its middle shell 3 can have another kind of pattern, and housing is for flattening into flat tube and closed at both ends person by a pipe.

Offer the passage of projection or depression on the first cyclic loop plate 5 and the second cyclic loop plate 4, in Fig. 3,4, Fig. 5, being provided with of this passage can be satisfied the demand that forms the loop; Wherein the set-up mode of the first cyclic loop plate and the second cyclic loop plate is approximate.

The first cyclic loop plate 5 in Fig. 2 and the second cyclic loop plate 4 are for being square, and in the user mode that wherein forms the quartering respectively, just be distinguished into four districts with cross, each district all forms a loop, be that the edge strip 57,47 that

bar

50b, 40b and two horn shapes intersect that separates that separates

bar

50a, 40a and vertical side non-intersect by each two and that be the horn shape parallel sides is connected to form, in this to horn shape by separate and respectively form a

center breach

58,48 between

bar

50a, 50b or 40a, 40b.

In a pair of

bar

40a and 40b and a pair of edge strip 47 of separating, or a pair of separating in

bar

50a and 50b and a pair of edge strip 57 spaces surrounded by frame, respectively with four

first parting bead

41,42,43,44,51,52,53,54 with

separate bar

40a, 40b, 50a, 50b forms four fat pipes side by side, again with one

second parting bead

45,55 both sides respectively with

first parting bead

44,54, the edge strip 47 of parallel sides, 57 form fat pipe side by side two times, separate bar 47 at the opposite side vertical side, 57 and show an end parting bead 46,56 separate into one than narrow passage, and make end parting bead 46,56 and

first parting bead

44,54 join.

At Fig. 3, among Fig. 4, the parallel sides of the first cyclic loop plate 5 separates bar 50a, first,

second parting bead

51,52,53,54,55 respectively are provided with a scalariform groove 59f with perpendicular edge strip of joining 57 places respectively, 59a, 59b, 59c, 59d, 59e, each groove 59 is located at the outer end of nearly fat pipe and time fat pipe, and form wide, the state of inferior fat pipe transverse intersection, so that each groove 59 becomes the tunnel end points that steam moves, even the steam of the first cyclic loop plate 5, via the cooling channel partly that keeps to the side of the first cyclic loop plate, 5 fat pipes, and be the state that is connected between the two halves of the left and right sides.

In Fig. 5, the parallel sides of the second cyclic loop plate 4 separates bar 40, first,

second parting bead

41,42,43,44,45 respectively is provided with one with perpendicular edge strip of joining 47 places respectively and runs through translot 49, forms between wide, inferior fat pipe to be arrangeding in parallel; It needs the transmission via the second tabular capillary structure 7, as shown in Figure 6.

Each loop on each

circuit board

4,5 forms by fat pipe, inferior fat pipe, than the connection shape of narrow passage.But above-mentioned structure only is a preferred embodiment.Wherein form steam channel 22 with fat pipe, to form fluid return passageway 24 than narrow passage, breach 48 places in center are evaporating area 21, and the panel edges place at fat pipe place is a condensing zone 23 in proper order, and it flows to the liquid of filling in housing 3 shown in Fig. 7.And fat pipe has partly had function and effect for condensing zone by condensing zone.

Loop 2 is made up of evaporating area 21, steam channel 22, condensing zone 23, the fluid return passage 24 of series connection in regular turn, is filled with an amount of liquid in loop 2, and the charging quantity of liquid is meant by filling up capillary structure to the volume that fills up 90% in the loop.Wherein fluid return passage 24 is passages of not sharing mutually with steam channel 22, just steam channel 22 is passages independently, fluid return passage 24 also is a passage independently, and this is the structure that is different from steam channel with the shared same passage of fluid return passage of existing conventional heat pipe.

The zone in loop 2 of the present invention, last, the below respectively forms two groups of loops 2, and a pair of loop of last branch or below is for being symmetrical set, the evaporating area 21 in the middle of promptly forming and the condensing zone 23 of periphery, make steam enter four steam channels that fat pipe composed in parallel 22, enter the inferior fat pipe of condensing zone 23 then, the liquid runs down that is condensed into is got back to evaporating area 21 than the formed fluid return passage 24 of narrow passage, just finish do action once, and the shape in loop can the cooperation demand be provided with, and is that evaporating area is arranged on the center among the figure, also can be the state of off-centre, or, all can use mode of the present invention at corner, form multiple shape.

In addition, be to form separately the independently single loop setting of four groups of parallel connection formulas in Fig. 2, liquid is confluxed in the center indentation, there, also can on the cyclic loop plate, form in-line several loops combination if necessary, so that the present invention can form the heat pipe structure of another kind of kenel sequentially with different contact contact thermals source.

And the present invention makes flow resistance in fluid return passage 24 greater than steam channel 22, this is the imbalance that painstakingly causes hot-fluid in the shell channel, to form the dissymmetrical structure that housing 3 inner fluid passages flow, the steam that is formed by evaporating area 21 is easy to and natural stability ground folk prescription to flowing towards condensing zone 23, and in cold emblem district 23 condensations formation condensate liquid stream, allow the liquid of condensation flow and not concretive gas, together with uncooled steam flow, the flow resistance in loop not under the same-action with the guiding of channel design under, simultaneously towards fluid return passage 24 stably folk prescription and be back to evaporating area 21 to flowing through fluid return passage 24.

The evaporating area 21 of indication of the present invention is exactly that loop 2 is subjected to thermal site partly, and it can be with a thermal source 8, as shown in Figure 6, join with at least one end face (bottom surface) center of housing 3, and thermal source is meant the easy heating surface of electronic building brick, typically refers to central processing unit, but is not limited to this assembly.So, the heat-exchange device of evaporating area and desire heat radiation joins, the heat-exchange device of desire heat radiation can be the heat transfer block of thermal source, the fins group of being heated, heating water sleeve or as the condensing zone in another group loop of the present invention, wherein another organized the serial connection pattern that loop is meant the present invention two loops.

In addition, condensing zone 23 of the present invention is exactly the position of loop heat radiation, this partly is main heat dissipation region, certainly passage itself also is good radiator structure, a condensing zone and a heat-exchange device 9 are joined, as shown in Figure 6, just the other end at least (end face) of condensing zone 23 with as the heat radiation heat-exchange device join, heat-exchange device be integral type radiator, radiating fin group, cooling tower or the present invention another the group loop evaporating area.So, housing can with at least one end face evaporating area more join with a thermal source, carrying out heat exchange, the part of all the other end faces of housing is to all joining with a heat-exchange device, to dispel the heat again.

In addition, at the steam channel shown in Fig. 2 22 is a plurality of passages, that is to say and to be provided with steam channel parallel with one another more than one or two 22, so that the flow resistance summation of each steam channel is less than fluid return passage, flow resistance wherein is controlled to be and changes loop total sectional area or total length or its combination, to form the state that flow resistance is little, flow velocity is big in the steam channel, and the state that flow resistance is big, flow velocity is little in the fluid return passage, make the hot-fluid that painstakingly forms in the loop asymmetric, impel determining of flow direction; And, fluid return passage 24 is a plurality of passages in Fig. 2, but also can be provided with fluid return passage parallel with one another more than two, aforesaidly have big flow resistance condition as long as meet, and make condensed fluid return evaporating area, be i.e. the pilot flow in generation loop naturally through fluid return passage, and the mobile phenomenon of this kind is that stable folk prescription is to flowing, and by what painstakingly limit, only can flow, can not violate arbitrarily flowing of design towards the direction of design.

Or allow and be full of liquid in the fluid return passage to form fluid-tight, it can be done and put a full capillary structure in the fluid return passage fully to form, also can dwindle gas by the space to reach above-mentioned fluid-tight effect, fluid-tight wherein is meant that the runner section dwindles or with the capillary structure closed flow, promptly the mode with the asymmetry that increases flow resistance is formed, the fluid circulation is more stable flows towards design direction and make, but can influence the trafficability characteristic of non-condensing gas this moment because of fluid return passageway, make the uniform temperature of this enforcement relatively poor, can see through degasification program to the loop, to eliminate non-condensing gas, improve uniform temperature.

Because loop 2 has been configured to tandem, and sequential folk prescription is to circulating, make the not concretive gas that is present in the loop not gather the space and the time of stop, can only flow or condensate liquid stream flows in the loop along steam flow, so, the present invention can form the liquid and the not concretive gas of liquid stream after gas that the steam channel space contains most steam flow and the few partly condensation in the loop, and most liquid and the few partly gas and the not concretive gas of steam flow for condensation in the fluid return passage space constitute apace folk prescription to circulating.Interior all fluids of heat pipe are all flowed towards same direction, and conflict mutually, and all fluids any time can both be by any passage in the system, so heat transfer property is good, hot biography amount is big, and has a narrow range of temperature.

The present invention is at the first folded mutually cyclic loop plate 5, posted one first tabular capillary structure 6 outside the second cyclic loop plate 4 respectively, one second tabular capillary structure 7, tabular capillary structure 6,7, about and the cyclic loop plate 4 of its length and width, 5 grades are big, but on the tabular capillary structure only the position with respect to fat pipe be provided with

groove

61,71, and groove is weak point than fat pipe, the groove place is for allowing the zone of steam flow, so aforesaid translot 49 promptly is to see through capillary structure 7 to join with fluid return passage, the utilization capillary structure attracts the liquid of condensation and guides to fluid return passage.In Fig. 2, be capillary structure with big cover type, it can be located at the one or both sides of independent one cyclic loop plate with at least one tabular capillary structure, to form the structure of storehouse shape.And tabular capillary structure is also than little with the cyclic loop plate, or is arranged between two cyclic loop plates.

Because capillary structure is a porous, be easy to become the passageway of liquid, capillary structure not only is provided with and in the length of the fluid return passage at condensate liquid stream place, its internal channel is diminished and flow resistance becomes big, or extend to evaporating area separately or extend to condensing zone separately, or extend to evaporating area and condensing zone simultaneously, or more can in whole loop, be provided with capillary structure, but the flow resistance that will meet steam channel is less than fluid return passage.Wherein capillary structure is pottery, sintered powder, foaming metal, mesh grid, sintering net, channel form plate, fibre bundle or helix.Wherein fluid return passage more will be provided with the space and allows steam and not concretive gas pass through.And capillary structure can place passage or to extend out to passage logical by outstanding on the tabular capillary structure for strip, and tabular capillary structure is not more than the cyclic loop plate.Be embedded with a capillary structure as scalariform groove, form being communicated with between fluid return passage and steam channel with capillary structure at the first cyclic loop plate.

In Fig. 7, more circle is provided with the sign of each zone of action, the centre is a condensation water evaporating area 21, at steam channel 22 inner half passages is the evaporating area of evaporation current, it promptly is the evaporation region 25 of broad sense, and in steam channel 22 outer half passages is the steam flow condensing zone, also be combined into the condenser zone 27 of broad sense with former condensing zone 23, its both sides are respectively returned the district for condensation water stream with the non-condensing air-flow, be provided with the passage that is communicated with 24 of steam channel 22 and fluid return passages again, but in the broadest sense, for being provided with a join domain 26, the passage that contains aforementioned connection, the scalariform groove, the condensing zone 23 that runs through translot etc. just makes join domain circle in 27 of evaporation region 25 and condenser zone.

Structure in sum, the present invention uses independently diversion mechanism, and the unequal framework of flow resistance between formation steam channel and fluid return passage, cooperate the hot-fluid imbalance that is produced, the principle of capillarity etc., form in-line order folk prescription to the fluid loop structure, and steam channel and fluid return passage also can the parallel structures of each self-forming multichannel, as long as under the major premise of flow resistance in fluid return passage 24 greater than steam channel 22, just can produce the connection cyclic loop, so, the present invention is in manufacturing process, need also can not operate heat transfer, if the housing inner looping is after the degasification program through the program of degasification, then heat conductivity is better, and operating temperature range is wider; So, make the easier composition in loop, on using, reality compares with existing heat pipe, the speed that its heat-conducting flow moves is faster than existing heat pipe, hot uniform temperature height, heat transmitting is good, and then hot biography amount is bigger, faster, so the present invention does not need the degasification processing procedure, and the clean process of cleaning is also inessential, make its processing procedure simple, then cost is low, and price also can reduce, has better economy, and functional characteristic is better, so the present invention can provide good usability, the present invention and existing heat pipe are diverse mechanism.

The above is the detailed description of preferred embodiment of the present invention and schemes attached; be not to be used for limiting the present invention; all scopes of the present invention should be as the criterion with the claimed scope of patent right book; the embodiment of all and of the present invention design philosophys and similar variation thereof, approximate construction all should be contained among the scope of patent protection of the present invention.

Claims

1. flat type loop type heat pipe is characterized in that: comprising:

One housing, it is the hollow obturator, is filled with appropriate amount of fluid in it, and

At least one cyclic loop plate that is the empty shape of Lou, it is located in the housing, and be provided with at least one loop thereon, the loop is made up of evaporating area, at least one steam channel, condensing zone and at least one fluid return passage string sign in regular turn, wherein steam channel, fluid return passage are passage independently separately, and the flow resistance that is positioned at fluid return passage is greater than steam channel, make the loop form asymmetric guiding effect, between steam channel and the fluid return passage passage that is connected is arranged, the loop is with empty each passage that forms of Lou;

Be subjected to the steam flow of thermosetting by evaporating area when liquid, flow to the liquid stream that condensing zone forms condensation, allow the liquid of condensation flow, and with the not concretive gas that is had in the loop, together with uncooled part steam flow, under the asymmetric guiding of passage hot-fluid in loop, simultaneously towards fluid return passage with single equidirectional flow, and be back to evaporating area, and flow into evaporation channel again, form circulating of loop.

2. flat type loop type heat pipe as claimed in claim 1 is characterized in that described housing is made up of a pair of top shell and drain pan.

3. flat type loop type heat pipe as claimed in claim 1 is characterized in that the evaporating area of at least one end face of described housing and a thermal source join, and to carry out heat exchange, the part of all the other end faces of housing is to all joining with a heat-exchange device, to dispel the heat again.

4. flat type loop type heat pipe as claimed in claim 1 is characterized in that described housing for being flat tubulose, and closed at both ends.

5. flat type loop type heat pipe as claimed in claim 1 is characterized in that the loading of described liquid, is meant the capacity of inserting liquid of the 80-90% of the volume of first each loop inner gateway of cyclic loop plate in the capillary structure that fills up in the housing and the loop.

6. flat type loop type heat pipe as claimed in claim 1 is characterized in that described cyclic loop plate forms by two plates are folded mutually.

7. flat type loop type heat pipe as claimed in claim 1 is characterized in that the evaporating area of described ring-type loop plate is set for the eccentric.

8. flat type loop type heat pipe as claimed in claim 1, the steam channel that it is characterized in that described ring-type loop plate is with setting parallel with one another more than two passages.

9. flat type loop type heat pipe as claimed in claim 1 is characterized in that the flow resistance of the fluid return passage of described ring-type loop plate is to instigate that the passage section of fluid return passage is long-pending to be reduced or passage length is increased or its combination greater than steam channel.

10. flat type loop type heat pipe as claimed in claim 1, the fluid return passage that it is characterized in that described ring-type loop plate are to form fluid-tight with liquid.

11. flat type loop type heat pipe as claimed in claim 10 is characterized in that described fluid-tight is meant that the runner section dwindles or with the capillary structure closed flow.

12. flat type loop type heat pipe as claimed in claim 1, the fluid return passage that it is characterized in that described ring-type loop plate is with setting parallel with one another more than two passages.

13. flat type loop type heat pipe as claimed in claim 1 is characterized in that described cyclic loop plate is that to have the material of capillarity or porous made.

14. flat type loop type heat pipe as claimed in claim 1 is characterized in that being between each loop on the described cyclic loop plate serial or parallel connection setting.

15. flat type loop type heat pipe as claimed in claim 1 is characterized in that having a center breach on the described cyclic loop plate, and becomes the evaporating area in each loop with the center breach.

16. flat type loop type heat pipe as claimed in claim 1, it is characterized in that described cyclic loop plate is the first cyclic loop plate, the first cyclic loop plate is made up of the number parting beads, and wherein parting bead has the scalariform groove, being communicated with between formation fluid return passage and steam channel.

17. flat type loop type heat pipe as claimed in claim 16 is characterized in that the scalariform groove of the described first cyclic loop plate is embedded with a capillary structure, forms being communicated with between fluid return passage and steam channel with capillary structure.

18. flat type loop type heat pipe as claimed in claim 1, it is characterized in that described cyclic loop plate is the second cyclic loop plate, the second cyclic loop plate is made up of a plurality of parting bead, wherein is formed with separately independently path with parting bead, and the plate mask between parting bead and limit has one to run through translot.

19. flat type loop type heat pipe as claimed in claim 1, it is characterized in that described ring-type loop plate is made up of the first cyclic loop plate and the second cyclic loop plate, the first cyclic loop plate is made up of a plurality of parting bead, wherein parting bead has the scalariform groove, form being communicated with between fluid return passage and steam channel, the second cyclic loop plate is made up of a plurality of parting bead, wherein is formed with separately independently path with parting bead, and the plate mask between parting bead and limit has one to run through translot.

20. flat type loop type heat pipe as claimed in claim 1, it is characterized in that described cyclic loop plate is the second cyclic loop plate, the second cyclic loop plate is made up of the number parting bead, wherein parting bead has independently passage, be provided with a capillary structure, the second cyclic loop plate and capillary structure are folded mutually, form being communicated with between fluid return passage and steam channel with capillary structure.

21. flat type loop type heat pipe as claimed in claim 1 is characterized in that: also be provided with at least one tabular capillary structure, it is arranged between cyclic loop plate and the housing.

22. flat type loop type heat pipe as claimed in claim 21 is characterized in that the shape of described tabular its setting of capillary structure can be identical with the cyclic loop plate or inequality.

23. flat type loop type heat pipe as claimed in claim 21 is characterized in that described tabular capillary structure is formed by pottery, sintered powder, foaming metal, mesh grid, sintering net, channel form plate, fibre bundle or helix.

24. flat type loop type heat pipe as claimed in claim 21 is characterized in that flow resistance that described tabular capillary structure forms fluid return passage greater than steam channel, and guides ring-type circuit board condensed fluid simultaneously and return evaporating area.

25. flat type loop type heat pipe as claimed in claim 21 is characterized in that described tabular capillary structure extends to the evaporating area and/or the condensing zone of cyclic loop plate.

26. flat type loop type heat pipe as claimed in claim 21, it is characterized in that described tabular capillary structure extends in the whole loop of cyclic loop plate, return the evaporating area of cyclic loop plate in order to liquid, but the flow resistance of fluid return passage needs greater than vapor passageway still.

27. flat type loop type heat pipe as claimed in claim 1 is characterized in that: also be provided with at least one tabular capillary structure, it is arranged between a pair of cyclic loop plate.