CN201964812U

CN201964812U - Novel flat heat pipe

Info

Publication number: CN201964812U
Application number: CN201020246830XU
Authority: CN
Inventors: 张平
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-07-05
Filing date: 2010-07-05
Publication date: 2011-09-07
Anticipated expiration: 2020-07-05

Abstract

The utility model discloses a novel flat heat pipe. By processing triangular or rectangular micro channels with equally unequal channel equivalent diameters and continuously communicated and porous media with unequal producer price index (PPI) values on the inner surfaces of upper and lower plates and side plates, the capillary limit, the boiling limit and the structural strength of the flat heat pipe are remarkably improved, and non-condensable gas generated by non-thorough cleaning and degassing during heat pipe preparation is effectively solved. The flat heat pipe can be used for heat transfer of electronic components. The flat heat pipe has the advantages that: (1) the capillary limit, the boiling limit and the structural strength of the flat heat pipe are remarkably improved; and (2) the non-condensable gas generated by non-thorough cleaning and degassing during heat pipe preparation is effectively solved.

Description

A kind of novel flat heat pipe

(1) technical field:

The utility model relates to a kind of flat plate heat tube that is used for heat conduction, and can be used to the cool electronic components and parts and conduct heat, specifically be a kind of miniature capillary pump loop flat plate heat pipe.

(2) background technology:

At present, flat plate heat tube with its can effectively increase heat transfer area with two-dimensional approach, uniform temperature is good, thermal conductivity factor is high, heat transfer is rapid, thermal resistance is little, be easy to be integrated into the advantage of radiating module and receive high praise day by day with multiple radiator, be widely applied on the chip-scale heat dissipation design.The existing various ways of flat plate heat tube is suggested, but is mostly to utilize the two dull and stereotyped confined spaces that form up and down, sintering capillary structure on the inwall of two flat boards, and be that working medium is made flat plate heat tube with water how.Yet, this form can not well improve the Heat Transfer of Heat Pipe on Heat Pipe performance, can not effectively overcome because of capillary force deficiency, the excessive mummification phenomenon that produces of flow resistance, and improve because of adding heat and surpass critical value and produce the boiling limit that liquid film is directed at the heating surface sintering, and can not effectively solve cleaning and the clean not concretive gas that produces of degasification when preparing because of heat pipe.

(3) summary of the invention:

Therefore, for addressing the above problem, the utility model proposes a kind of capillary limit that can comparatively significantly improve flat-plate heat pipe, the boiling limit and structural strength, and effectively solve the flat plate heat tube of the not concretive gas that cleaning and degasification do not produce only when preparing because of heat pipe.

According to a kind of novel flat heat pipe described in the utility model, comprise a closure casing, working medium, capillary structure and porous media supporting construction.Closure casing has by last, the space that lower plate and side plate are welded to form, and last, the triangle that communicates continuously that the equivalent diameter that processes lower plate and side plate inner surface does not wait successively or the micro-channel of rectangle, be beneficial to form formation and the second cosmic velocity that the nucleus of boiling is accelerated bubble, because of the flow resistance of bubble in the bigger micro-channel of equivalent diameter less than at the less micro-channel resistance of equivalent diameter, therefore make the not concretive gas that when heat pipe prepares, does not produce only get rid of by gas vent in using for the first time because of cleaning and degasification, this measure also makes the transport path of working medium in capillary structure shorten, and increased the evaporation/condensation area, strengthen boiling heat transfer, and rolled up the closed loop; Utilize porous media material to do support column, and so as to reinforcement flat plate heat tube structural strength, and provide capillary force that working medium is refluxed, and can further reduce the thermal resistance of upper and lower plates; The metallurgical mesh formula capillary structure of powder China ink that adopts is with the lower plate sintering, it is capillary structure that upper plate adopts the bigger porous media of PPI value, and be aided with the less porous media support column of PPI value, form by the lower plate capillary structure with this, vapor chamber, upper plate porous media capillary structure is to the steam channel of upper plate condensing zone, and by the upper plate condensing zone, upper plate porous media capillary structure, the porous media support column, the lower plate capillary structure is to the lower plate evaporating area with by the micro-channel of upper plate condensing zone, the side plate micro-channel is to the working medium return flow line of lower plate micro-channel, form steam channel and the different circulation canal of working medium backflow runner with this, and can make when preparing cleaning be followed the whole circulation channel cycle by capillary force and steam pressure promotion with the not concretive gas that degasification does not produce only because of heat pipe, and effectively overcome because of the capillary force deficiency, excessive and the mummification phenomenon that produces of flow resistance, and improve because of adding heat and produce the boiling limit that liquid film is directed at the heating surface sintering above critical value; Working medium can adopt general heat pipe water commonly used, ammonia etc., the equivalent diameter that upper and lower plate and side plate inner surface process the micro-channel of the triangle that communicates continuously that do not wait successively or rectangle also matches with it, and selects for use the metallurgical mesh structure of lower plate powder China ink, porous media support column and the upper plate porous media that match to strengthen capillary force.Employing is last, the triangle that communicates continuously that the equivalent diameter that processes lower plate and side plate inner surface does not wait successively or the micro-channel of rectangle and the porous media capillary structure that the PPI value does not wait, be because the easier flow resistance from big micro-channel of equivalent diameter and porous media capillary structure of bubble is littler than the flow resistance of little micro-channel of equivalent diameter and porous media capillary structure, otherwise its capillary force to working medium is bigger, the second cosmic velocity of bubble and the back-flow velocity of working medium have been accelerated, thereby improved the capillary limit and the boiling limit of flat-plate heat pipe effectively, become big flared structure successively and reach effect same thereby the micro-channel among the present invention also can be processed into equivalent diameter.

A kind of novel flat heat pipe described in the utility model is by processing the triangle that communicates continuously or the micro-channel of rectangle and the porous media that the PPI value does not wait that equivalent diameter does not wait successively at upper and lower plate and side plate inner surface, significantly improve capillary limit, the boiling limit and the structural strength of flat-plate heat pipe, and also comparatively efficiently solved the not concretive gas that cleaning and degasification do not produce only when preparing because of heat pipe.

For the ease of understanding structure content of the present utility model in depth and can reaching beneficial effect, the utility model is described in further detail below in conjunction with accompanying drawing and concrete enforcement.

(4) description of drawings:

Fig. 1 is the cutaway view of the utility model flat plate heat tube.

Fig. 2 is a porous media support column schematic diagram of the present utility model.

Fig. 3 is the metallurgical mesh formula capillary structure schematic diagram of lower plate powder China ink of the present utility model.

Fig. 4 is a upper plate porous media capillary structure of the present utility model.

Fig. 5 is a lower plate front view of the present utility model.

Accompanying drawing sign: upper plate 1, side plate 2, lower plate 3, porous media support column 4, upper plate porous media capillary structure 5, the metallurgical mesh formula capillary structure 6 of lower plate powder China ink, thermal source 7, vaporium 8, reservation implementation of port/exhaust outlet 9.

(5) specific embodiment:

In Fig. 1,2, the utility model discloses a kind of novel flat heat pipe and comprise upper plate 1, side plate 2, lower plate 3, porous media support column 4, upper plate porous media capillary structure 5, the metallurgical mesh formula capillary structure 6 of lower plate powder China ink, vaporium 8 compositions, its forming process is followed successively by: at first moulding upper plate 1 and upper plate porous media capillary structure 5, side plate 2, porous media support column 4, the metallurgical mesh formula capillary structure 6 of lower plate powder China ink, again with lower plate 3 sintering and welding; Upper plate porous media capillary structure 5, porous media support column 4, upper plate 1, side plate 2, lower plate 3, be commaterial,, be beneficial to reduce system's thermal contact resistance and be convenient to sintering and welding such as being copper or aluminium all.

At Fig. 1,2,3,4, in 5, the utility model discloses a kind of flat plate heat tube, comprise by upper plate 1, side plate 2, lower plate 3, porous media support column 4, upper plate porous media capillary structure 5, the metallurgical mesh formula capillary structure 6 of lower plate powder China ink, vaporium 8 and working medium are formed, wherein at upper plate 1, side plate 2, the conduit equivalent diameter that processes lower plate 3 inner surfaces does not wait the triangle that communicates continuously of (a as shown in Figure 5 is not equal to b) or the micro-channel of rectangle successively, be beneficial to form formation and the second cosmic velocity that the nucleus of boiling is accelerated bubble, because of the flow resistance of bubble in the bigger micro-channel of equivalent diameter less than at the less micro-channel resistance of equivalent diameter, therefore make the not concretive gas that when heat pipe prepares, does not produce only get rid of by gas vent 9 in using for the first time because of cleaning and degasification, this measure also makes the transport path of working medium in capillary structure shorten, and increased the evaporation/condensation area, strengthen boiling heat transfer, and rolled up the closed loop; Porous media support column 4, can strengthen the flat plate heat tube structural strength, because of the PPI value is bigger than upper plate porous media capillary structure 5, working medium flow resistance therein is also different, thereby provide enough capillary forces that working medium is refluxed, and can further reduce the thermal resistance of upper and lower plates; Filling working medium can fill by the reservation implementation of port/exhaust outlet 9 on the lower plate 3; The metallurgical mesh formula capillary structure 6 of lower plate powder China ink, and with lower plate 3, porous media support column 4 and upper plate porous media capillary structure 5 be sintering together, form by lower plate 3 evaporating area micro-channel with this, the metallurgical mesh formula capillary structure 6 of lower plate powder China ink, vaporium 8, upper plate porous media capillary structure 5 is to the steam channel of upper plate 1 condensing zone micro-channel, and by the micro-channel of upper plate 1 condensing zone, upper plate porous media capillary structure 5, porous media support column 4, the metallurgical mesh formula capillary structure 6 of lower plate powder China ink is to lower plate 3 evaporating area micro-channel with by upper plate 1 condensing zone micro-channel, the micro-channel of side plate 2 is to the working medium return flow line of lower plate 3 evaporating area micro-channel, form steam channel and the different circulation canal of working medium backflow runner with this, and can make when preparing cleaning be followed the whole circulation channel cycle by capillary force and steam pressure promotion with the not concretive gas that degasification does not produce only because of heat pipe, and effectively overcome because of the capillary force deficiency, excessive and the mummification phenomenon that produces of flow resistance, and improve because of adding heat and produce the boiling limit that liquid film is directed at the heating surface sintering above critical value; Working medium can adopt general heat pipe water commonly used, ammonia etc., the equivalent diameter that upper and lower plate and side plate inner surface process the micro-channel of the triangle that communicates continuously that do not wait successively or rectangle also matches with it, and selects for use the metallurgical mesh structure 6 of lower plate powder China ink, porous media support column 4 and the upper plate porous media capillary structure 5 that match to strengthen capillary force.Also can be by after whole flat plate heat tube moulding, give the certain heat flow of lower plate 3 of flat plate heat tube, get rid of certain non-condensing gas, property burn-back again by the reservation exhaust outlet 9 of upper plate.

A kind of novel flat heat pipe in sum, the utility model uses independently diversion mechanism, and constitute between steam channel and working medium return flow line the different structure of resistance between the unequal and micro-channel of flow resistance, cooperation is produced, the hot-fluid imbalance, the principle of capillarity etc., form in-line order folk prescription to fluid circulation loop, and steam channel and working medium return flow line also can the parallel structures of each self-forming multichannel, as long as under the major premise of flow resistance in the working medium return flow line greater than steam channel, just can produce UNICOM's cyclic loop, cleaning was followed the whole circulation channel cycle with the not concretive gas that degasification does not produce only by capillary force and steam pressure promotion when so the utility model made and prepares because of heat pipe, and effectively overcome because of the capillary force deficiency, excessive and the mummification phenomenon that produces of flow resistance, and improve because of adding heat and produce the boiling limit that liquid film is directed at the heating surface sintering above critical value.

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

Claims

1. a novel flat heat pipe comprises closure casing, capillary structure and supporting construction, it is characterized in that:

Described closure casing, the Surface Machining that included has upper plate (1), side plate (2) and the lower plate (3) of the micro-channel of triangle that communicates continuously that equivalent diameter do not wait successively or rectangle, capillary structure comprises porous media support column (4), upper plate porous media capillary structure (5), lower plate powder China ink metallurgical mesh formula capillary structure (6), porous media support column (4) is as supporting construction, and adjacent conduit equivalent diameter does not wait successively and the triangle that communicates continuously or the micro-channel of rectangle by being processed with at upper plate (1), lower plate (3) and side plate (2) inner surface.

2. a kind of novel flat heat pipe according to claim 1 is characterized in that described flat-plate heat pipe also can be processed into the conduit equivalent diameter in the micro-channel of the triangle of upper plate (1), side plate (2), the processing of lower plate (3) inner surface or rectangle and become big flared structure successively.