CN217032146U - High-power sintered heat pipe - Google Patents

Abstract

The utility model discloses a high-power sintered heat pipe which comprises a heat pipe wall, wherein a capillary structure layer and a steam channel are arranged in the heat pipe wall, the steam channel is formed by surrounding the capillary structure layer, the capillary structure layer comprises a cooling section, a heating section and an intermediate heat insulation section, the cooling section and the heating section are positioned at two ends of the capillary structure layer, the intermediate heat insulation section is positioned between the cooling section and the heating section, and the thickness of the intermediate heat insulation section is larger than that of the cooling section and that of the heating section. The high-power sintered heat pipe is characterized in that a capillary structure layer with inconsistent thickness is sintered on the inner wall of the heat pipe wall, an internal liquid heat transfer medium absorbs heat and is vaporized into steam in a heating section in the high-power sintered heat pipe, the steam is transferred to a cooling section to release heat under the action of internal steam pressure difference and is condensed into liquid again, and the liquid heat transfer medium flows back to the heating section along the capillary structure layer under the capillary action force of the capillary structure layer to perform the next round of heat transfer circulation, so that the heat transfer process is completed once.

Description

High-power sintered heat pipe

Technical Field

The utility model belongs to the field of radiators, and particularly relates to a high-power sintered heat pipe.

Background

The sintered heat pipe is used as a heat transfer device and can be applied to any component needing heat transfer. And the sintering heat pipe can be processed into different shapes according to different application scenes to adapt to the requirements of special scenes. However, as the length of the sintered heat pipe is longer, the time required by the process of reflowing the liquid heat transfer medium in the sintered heat pipe under the capillary action is longer, so that the maximum heat transfer amount is reduced; the longer the reflux time of the liquid heat transfer medium is, the more the liquid heat transfer medium is too late to supplement the heating section, so that the phenomenon of dry burning in the pipe that the liquid in the pipe does not have enough liquid for heating evaporation circulation is formed; the maximum heat transfer capacity of a single sintering heat pipe is correspondingly reduced, and the longer the length of the sintering heat pipe is, the longer the time required by the liquid medium replenishing process is. The maximum heat transfer capacity of the sintered heat pipe decreases with increasing length.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a high-power sintering heat pipe which has higher bearing capacity and can meet the application scene of high-power and long-distance heat transmission.

In order to solve the technical problems, the technical scheme provided by the utility model is as follows:

the utility model provides a high power sintering heat pipe, includes the heat pipe wall, be equipped with capillary structure layer and vapour passageway in the heat pipe wall, the vapour passageway by capillary structure layer encloses establishes and forms, capillary structure layer is including the cooling zone, the heating section that are located both ends and being located the adiabatic section in the middle between cooling zone and the heating section, the thickness of adiabatic section in the middle of being greater than cooling zone and heating section.

Further, the capillary structure layer is a sintered copper powder layer.

Further, a transition section is arranged between the cooling section and/or the heating section and the intermediate heat insulation section.

Further, the transition section is in a circular truncated cone shape.

Further, a heat transfer medium is filled in the steam channel.

The utility model has the beneficial effects that:

the high-power sintered heat pipe is characterized in that a capillary structure layer with inconsistent thickness is sintered on the inner wall of the heat pipe wall, an internal liquid heat transfer medium absorbs heat and is vaporized into steam in a heating section in the high-power sintered heat pipe, the steam is transferred to a cooling section to release heat under the action of internal steam pressure difference and is condensed into liquid again, and the liquid heat transfer medium flows back to the heating section along the capillary structure layer under the capillary action force of the capillary structure layer to perform the next round of heat transfer circulation, so that the heat transfer process is completed once.

Drawings

Fig. 1 is a side sectional view of a high power sintered heat pipe of the present invention in a preferred embodiment.

The reference numerals include:

1-cooling section 2-intermediate heat insulation section 3-heating section

4-capillary structure layer 5-heat pipe wall 6-transition section

7-vapor channel

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and do not limit the utility model.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must be in a particular orientation, constructed or operated in a particular orientation, and is not to be construed as limiting the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1, which is a preferred embodiment of the present invention, the high power sintered heat pipe includes a heat pipe wall 5, a capillary structure layer 4 and a vapor channel 7 are disposed in the heat pipe wall 5, the vapor channel 7 is surrounded by the capillary structure layer 4, the capillary structure layer 4 includes a cooling section 1, a heating section 3 and an intermediate heat insulation section 2 located between the cooling section 1 and the heating section 3, and the thickness of the intermediate heat insulation section 2 is greater than that of the cooling section 1 and that of the heating section 3.

The high-power sintered heat pipe is characterized in that a capillary structure layer 4 with inconsistent thickness is sintered on the inner wall of a heat pipe wall 5, an internal liquid heat transfer medium absorbs heat and is vaporized into steam in a heating section 3 in the high-power sintered heat pipe, the steam is transmitted to a cooling section 1 along a steam channel 7 in the high-power sintered heat pipe under the action of internal steam pressure difference to be condensed into liquid again, and the liquid heat transfer medium flows back to the heating section 3 along the capillary structure layer 4 under the capillary action force of the capillary structure layer 4 to perform the next round of heat transfer circulation, so that the heat transfer process is completed once.

If the liquid medium in the heat pipe flows back too slowly to reach the supplementary heating section 3, the heat pipe will fail at that power, and the longer the heat pipe is, the longer the liquid medium needs to flow back, and the lower the failure power of the heat pipe will be. In order to increase the length of the heat pipe and simultaneously maintain higher heat transfer power to meet the scene requirement, the thickness of the middle heat insulation section 2 of the capillary structure layer 4 is increased by the capillary structure layer 4 to improve the capillary force of liquid heat transfer medium backflow, the speed of the heat transfer medium backflow is accelerated, the heat transfer medium at the heating section 3 is supplemented in time to complete heat transfer circulation, the capillary structure layer 4 maintains the length increase and simultaneously has higher heat transfer capacity, and the conditions of high power and long-distance heat transfer are met.

The high-power sintered heat pipe is suitable for high-power requirements, and a long heat pipe is needed in a limited space to complete an application scene of heat transfer. The high-power sintered heat pipe comprises a heat pipe wall 5 and a capillary structure layer 4. The above components are described in further detail below.

The heat pipe wall 5 is preferably a copper pipe cut to length to serve as a vapor transfer passage, and the internal cavity is closed with the capillary structure layer 4 and the heat transfer medium. It will be appreciated that the heat pipe wall 5 may be manufactured in different lengths and specific shapes as required to meet the heat dissipation requirements of various fields and situations.

Preferably, the capillary structure layer 4 is a sintered copper powder layer. The capillary structure layer 4 comprises a cooling section 1, a heating section 3 and an intermediate heat insulation section 2, wherein the cooling section 1 and the heating section 3 are arranged at two ends of the capillary structure layer, the intermediate heat insulation section 2 is arranged between the cooling section 1 and the heating section 3, and the thickness of the intermediate heat insulation section 2 is larger than that of the cooling section 1 and that of the heating section 3. After the heat transfer medium is cooled in the cooling section 1, the liquid heat transfer medium is driven by force to be adsorbed to the heating section 3 under the capillary action force of the capillary structure layer 4, so that the heat transfer cycle is completed in cycles.

Preferably, a transition section 6 is arranged between the cooling section 1 and/or the heating section 3 and the intermediate heat insulation section 2, and the transition section 6 is in a circular truncated cone shape.

A certain-shaped central rod is inserted into the heat pipe wall 5, and after copper powder is added, the copper-containing central rod is sintered at a high temperature to form a copper capillary structure layer 4. Specifically, a central rod with a small middle diameter and large diameters at two ends is inserted into the heat pipe wall 5, then a certain amount of copper powder is filled into a gap between the central rod and the heat pipe wall 5, and then the copper powder is sintered into a capillary structure layer 4 with inconsistent axial thickness in a high-temperature furnace at a certain temperature, namely the thickness of a middle heat insulation section 2 of the capillary structure layer 4 is large, and the thicknesses of a cooling section 1 and a heating section 3 at two ends are thin; the capillary structure layer 4 encloses a steam channel 7, correspondingly, the diameter of the part of the steam channel 7 corresponding to the middle heat insulation section 2 is small, and the diameter of the part of the steam channel 7 corresponding to the cooling sections 1 and the heating sections 3 at the two ends is large; and finally, injecting a certain heat transfer medium into the heat pipe wall 5, pumping to a vacuum state, and welding and sealing two ends of the heat pipe wall 5 to form a vacuum state with a sealed interior.

According to the difference of the thickness of the capillary structure layer 4, the central rod is processed into different diameters according to the requirements, specifically, the diameter of the central rod corresponding to the middle heat insulation section 2 is small, the gap between the central rod and the heat pipe wall 5 is large, the powder filling amount is large, the sintered capillary structure layer 4 is thick, and the adsorption effect of the capillary structure layer 4 on a liquid heat transfer medium is strong; and the diameter of the central rod corresponding to the cooling sections 1 and the heating sections 3 at the two ends is large, and the gap between the central rod and the hot pipe wall 5 is smaller than that of the central rod corresponding to the middle heat insulation section 2, so that the thickness of the capillary structure layer 4 sintered by the cooling sections 1 and the heating sections 3 is thin.

Corresponding to the capillary structure layer 4, the diameters of the two ends of the vapor channel 7 are larger, and the velocity of the vapor flowing along the vapor channel 7 under the driving of pressure difference cannot generate larger influence due to the reduction of the diameter of the vapor channel 7 in the middle part; the reflux speed of the liquid medium under the capillary action of the capillary structure layer 4 is increased due to the increase of the capillary action of the middle heat insulation section 2 of the capillary structure layer 4, so that the speed of the liquid medium for supplementing the heating section 3 can be increased, and although the length of the high-power sintered heat pipe is increased, the heating section can be supplemented in time due to the increase of the reflux speed of the liquid medium, so that the long high-power sintered heat pipe still has enough liquid medium for heat absorption and vaporization under high power to complete the heat transfer effect, and long-distance and high-power heat dissipation is realized.

The heat transfer medium, usually pure water, is used for being heated and vaporized into steam, the steam carrying certain heat is re-condensed into liquid after being released heat in the cooling section 1, and then reaches the heating section 3 under the driving of the capillary force of the capillary structure layer 4, so as to complete a cycle process, and the heat transfer medium is used as a heat transfer medium. The heat transfer medium may be employed as a different type of medium, as required. Different volumes, or different kinds of heat transfer media may be injected into the vapor passage 7 depending on the actual power and the needs of a particular scenario.

Compared with the sintering heat pipe technology adopting the capillary structure layer 4 with uniform thickness to flow back and forth with the liquid medium, the capillary adsorption force of the liquid medium of the high-power sintering heat pipe in the middle heat insulation section 2 is larger, so that the backflow speed of the liquid medium in the area can be accelerated, the supplement speed of the liquid medium to the heating section 3 is accelerated, the maximum heat transfer value borne by the high-power sintering heat pipe is greatly improved, the length increase of the high-power sintering heat pipe is maintained, but the maximum heat transfer capacity can be greatly improved, and the high-power sintering heat pipe can be suitable for an electronic heat dissipation structure with high power and long-distance heat transfer. And the high-power sintering heat pipe can use less heat pipes in a limited space to carry out long-distance heat transfer on a high-power application scene so as to finish long-distance heat dissipation on a high-power product.

The foregoing is only a preferred embodiment of the present invention, and many variations in the detailed description and the scope of the application may be made by those skilled in the art without departing from the spirit of the utility model.

Claims (5)

1. The utility model provides a high power sintering heat pipe, includes heat pipe wall (5), its characterized in that, be equipped with capillary structure layer (4) and steam channel (7) in heat pipe wall (5), steam channel (7) by capillary structure layer (4) enclose establishes and form, capillary structure layer (4) are including cooling zone (1), the heating section (3) that are located both ends and be located adiabatic section (2) in the middle between cooling zone (1) and the heating section (3), the thickness of adiabatic section (2) in the middle of is greater than cooling zone (1) and heating section (3).

2. High power sintered heat pipe according to claim 1, characterized in that the wick layer (4) is a layer of sintered copper powder.

3. High power sintered heat pipe according to claim 1, characterized in that a transition section (6) is provided between the cooling section (1) and/or heating section (3) and the intermediate heat insulating section (2).

4. The high power sintered heat pipe of claim 3, wherein the transition section (6) is frustoconical.

5. The high power sintered heat pipe of claim 1, characterized in that the vapor channel (7) is filled with a heat transfer medium.

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