CN101236054A - Integrated internal circulation heat pipe - Google Patents

Abstract

An integrated internal circulation heat pipe, which is equipped with an internal circulation channel. One end of the circulation channel is located in the cooling section of the heat pipe, and the other end communicates with the liquid-absorbing wick installed inside the heating section of the heat pipe. The internal circulation structure of the present invention makes the steam channel Separated from the liquid working medium channel, the working medium flow resistance in the tube is small and the heat transfer is large. The internal circulation heat pipe has a certain anti-gravity height in the gravitational field, which is especially suitable for the heat transfer of the heat pipe when the heat source position is higher than the heat sink position, and maintains the shape of the conventional heat pipe, avoiding the complex shape of the loop heat pipe, large size, The disadvantage of many components has the characteristics of simple manufacture, low cost and convenient installation.

Description

Integrated internal circulation heat pipe

technical field

The invention belongs to the technical field of heat transfer, and in particular relates to heat transfer by means of a heat pipe.

Background technique

A heat pipe is a device that relies on the phase change of its internal working medium to achieve heat transfer. The working medium in the tube is heated and vaporized in the evaporation section, and the generated steam flows to the condensation section under a certain pressure difference, and releases heat in the condensation section. Re-condensed into liquid and returned to the evaporation section, thus forming the circulation of the working medium.

The most common heat pipe is mainly tube heat pipe, which is mainly used to realize long-distance heat transmission under small temperature difference. Because of its reliable operation, simple structure, and normal operation under weightless conditions, it has been widely used in the aerospace field. However, for the conventional heat pipes used in the gravity field, due to its own structure, there is a fatal shortcoming, that is, the ability to work against gravity is low. For conventional heat pipes installed vertically or obliquely, the heat source must be located under the heat sink , otherwise the heat pipe will not work properly. This is mainly because gravity has an important influence on the flow of the working medium in the heat pipe. For conventional heat pipes, although grooves can also be opened in the pipe, or mesh or porous materials that can increase the capillary force can be attached, the capillary force is relatively low. In terms of gravity, it is still in a secondary position. The capillary force provided by the capillary structure in the tube is difficult to overcome the influence of gravity, so when the heat source is higher than the heat sink, the heat pipe cannot work normally.

In order to overcome the influence of gravity, unconventional heat pipes such as loop heat pipes and capillary pump heat pipes have been invented. In the gravitational field, these unconventional heat pipes can provide a certain anti-gravity height and can work under the condition that the heat source is higher than the heat sink. The ubiquitous problems of these unconventional heat pipes are that their structures are complex, their external dimensions are large, many parts are involved, and their cost is high. Apart from the aerospace field, their application in other fields is very limited.

Contents of the invention

In order to overcome the fact that conventional heat pipes cannot work under anti-gravity conditions, the present invention provides an integrated internal circulation heat pipe. By installing an internal circulation pipe inside the heat pipe and installing a liquid-absorbing wick in the heating section, the steam channel and the liquid state are realized. Due to the separation of mass channels, the heat transfer is large, and the internal circulation heat pipe provides a certain anti-gravity height, and at the same time, it has the shape of a conventional heat pipe, and the manufacturing cost is reduced.

The technical scheme adopted in the present invention is: an internal circulation pipe is installed inside the heat pipe, a liquid-absorbing core is installed on the heating section of the heat pipe, and a steam channel is provided on the surface of the liquid-absorbing core. One end of the internal circulation pipe is located at the cooling section of the heat pipe, and the other end is connected The liquid-absorbing core inside the heating section of the heat pipe is connected; the shape of the internal circulation pipe installed in the heat pipe can be circular, oval, triangular or polygonal; the number of internal circulation pipes can be single or multiple; One end of the internal circulation pipe is connected to the inside of the liquid-absorbing core, and can also be connected to the liquid storage chamber at the top of the heat pipe through the liquid-absorbing core; the shape of the integrated internal circulation heat pipe can be circular, oval, triangular or polygonal. In the present invention, an internal channel is added to the inner cavity of a tube-type conventional heat pipe, and a liquid-absorbing core with a vapor channel on the surface is installed on the heating section of the heat pipe, so that when the heating section of the heat pipe is heated, the heat is transferred to the liquid-absorbing core through the tube wall , the liquid working medium in the liquid-absorbing core evaporates and vaporizes when heated, and the generated steam enters the steam chamber through the steam channel of the liquid-absorbing core, and then flows to the cooling section under the action of a certain pressure difference. The steam releases heat in the cooling section and is regenerated. It condenses into liquid, and then the liquid working medium flows back to the upper part of the heat pipe along the internal channel under the action of pressure difference, and flows to the heating section under the action of the capillary force provided by the liquid-absorbing wick, thus forming the circulation of the working medium. When the heat load changes, the liquid in the liquid storage chamber participates in circulation to ensure that the liquid-absorbing core in the heating section can have enough liquid working fluid. Such an internal circulation structure realizes a function similar to that of a loop heat pipe, that is, the capillary core only exists in the heating section, the vapor channel and the liquid channel are separated, the heat transfer is large, and the gravity field has a certain anti-gravity height.

The beneficial effects of the invention are: by adding an internal circulation pipe inside the heat pipe and installing a liquid-absorbing core in the heating section, the separation of the steam channel and the liquid working medium channel is realized, the flow resistance is reduced, and the heat transfer capacity is improved. Similar to the loop heat pipe, in this integrated internal circulation heat pipe, the liquid-absorbing wick only exists in the heating section of the heat pipe, and the other parts are bare pipes, which is beneficial to reduce the flow resistance of the working medium in the pipe. Through the liquid-absorbing core installed in the heating section of the internal circulation heat pipe and the reasonable arrangement of the internal circulation pipe and the liquid-absorbing core, the internal circulation heat pipe can work under certain anti-gravity conditions, and the heat source can be arranged at a position higher than the heat sink. In the practical application of the heat pipe, the arrangement of the heat source is more flexible; the heat pipe can also maintain the shape of the conventional heat pipe, with small volume and large heat transfer capacity, avoiding the complex shape, large size and large size of the loop heat pipe and capillary pump heat pipe. The disadvantage of many components provides convenience for the installation of the heat pipe.

The invention is particularly suitable for the situation that heat pipes are used for heat transfer, and the position of the heat source is higher than that of the heat sink.

Description of drawings

FIG. 1 is a schematic cross-sectional structure diagram of an integrated internal circulation heat pipe.

In the figure: 1. Integrated internal circulation heat pipe, 2. Heating section, 3. Connection channel, 4. Cooling section, 5. Liquid inlet, 6. Internal circulation pipe, 7. Steam channel, 8. Liquid-absorbing core, 9 , storage room

Detailed ways

The present invention will be described in further detail below in conjunction with accompanying drawing embodiment:

In the embodiment shown in Figure 1, the upper part of the integrated internal circulation heat pipe 1 is the heating section 2, the lower part is the cooling section 4, the middle part is the connecting channel 3, the internal circulation pipe 6 is located inside the heat pipe, and the bottom of the internal circulation pipe has an inlet The liquid port 5, the top is connected with the inside of the liquid-absorbing core 8, the liquid-absorbing core is located in the heating section of the heat pipe, the surface of the liquid-absorbing core has a steam channel 7, and the liquid storage chamber 9 is located at the top of the heat pipe. When the heating section 2 of the integrated internal circulation heat pipe 1 is heated, the heat is transferred to the liquid-absorbing core 8 located in the heating section of the heat pipe through the wall surface, and the liquid working medium in the liquid-absorbing core is heated and vaporized, and the generated steam passes through the liquid-absorbing core The steam channel 7 on the surface enters the connecting channel 3, and then enters the cooling section 4 of the heat pipe. The steam releases heat in the cooling section and is condensed into a liquid again, and then the liquid working medium enters through the liquid inlet 5 under a certain pressure difference. The inner circulation pipe 6 rises along the inner circulation pipe and enters the liquid-absorbing core, and the liquid working medium flows to the heating section under the action of the capillary force of the liquid-absorbing core, thereby forming the circulation of the working medium. When the heat load changes, the liquid in the liquid storage chamber 9 participates in the circulation to ensure that the liquid-absorbing core in the heating section can have enough liquid working fluid.

The integrated internal circulation heat pipe of the present invention can be circular, oval, triangular or polygonal. The internal circulation pipe installed inside the heat pipe can be circular, oval, triangular or polygonal. One end of the internal circulation pipe is connected to the inside of the liquid-absorbing core, and may also be connected to the liquid storage chamber at the top of the heat pipe through the liquid-absorbing core. The inner wall of the integrated internal circulation heat pipe can be a smooth wall surface, or can be carved with grooves. The outer wall of the integrated internal circulation heat pipe can be a smooth wall or be provided with fins.

Claims (5)

1. integrated type internal circulation hot pipe, it is characterized in that: at inside heat pipe inner circulating tube is housed, the heat pipe bringing-up section is equipped with the imbibition core, and the imbibition wicking surface has steam channel, one end of inner circulating tube is positioned at the cooling section of heat pipe, and the other end communicates with the imbibition core that is installed in heat pipe bringing-up section inside.

2. integrated type internal circulation hot pipe according to claim 1 is characterized in that: the shape of the inner circulating tube of installing in the described integrated type internal circulation hot pipe can be circular, also can be ellipse, triangle or polygon.

3. according to claim 1,2 described integrated type internal circulation hot pipes, it is characterized in that: the quantity of the inner circulating tube of installing in the described integrated type internal circulation hot pipe can be single, also can be a plurality of.

4. according to claim 1,2 described integrated type internal circulation hot pipes, it is characterized in that: an end of the inner circulating tube of installing in the described integrated type internal circulation hot pipe is connected to imbibition in-core portion, also can link to each other with the fluid reservoir that is positioned at the heat pipe top through the imbibition core.

5. according to claim 1,2 described integrated type internal circulation hot pipes, it is characterized in that: described integrated type internal circulation hot pipe shape can be circular, also can be ellipse, triangle or polygon.