CN2741187Y - Impulsive circulating heat tube for cooling electronic device - Google Patents

Abstract

The utility model belongs to the technical field of electronic cooling, and relates to components for cooling semiconductors or other solid devices. The pulsating heat pipe is composed of a group of thick straight pipes 14 and thin straight pipes 15 arranged parallel to each other. The elbows 16 are connected; the heat transfer working fluid forms a one-way plug-like flow in the pipe under the pressure generated by heat action, absorbs heat and evaporates in the heating section 17, and releases heat and condenses in the heat dissipation section 18. The pulsating heat pipe of the utility model has high heat transfer limit and low thermal resistance, and has the advantages of light weight, low cost, convenient processing, reliable operation and no noise, and is suitable for cooling modern high energy consumption electronic equipment.

Description

Circulating Flow Type Pulsating Heat Pipes for Electronic Device Cooling

Technical field:

The invention belongs to the technical field of electronic cooling, and relates to components for cooling semiconductors or other solid devices.

Background technique:

With the continuous development of electronic assembly technology, the physical size of components is getting smaller and smaller, and the assembly density is increased; the performance of chips is improved, and the heat generated by them is also increased accordingly, resulting in the formation of high heat density of electronic devices. Therefore, it is more and more important to find effective heat dissipation methods for electronic devices.

The conventional heat dissipation method mainly relies on the heat sink on the radiator to dissipate heat through heat conduction, which cannot meet the heat dissipation requirements of high heat flux.

As shown in Figure 4: the circulation type heat pipe is a serpentine pipe, and its two ends are sealed and connected to form a loop. In the pipeline where the heat pipe flows, at least one float type check valve 19 is required to limit the one-way flow of vapor and liquid, evaporate in the heating section and condense in the cooling section. In the case of large or unstable heat transfer, The movement of the float valve 19 is limited, which will generate pulsation, which not only affects the stability and reliability of the heat pipe, but also makes it difficult to realize the miniaturization of the heat pipe.

As shown in Figure 5: the loop heat pipe separates the liquid channel from the gas channel to form a circulation loop. The return of the fluid creates a flow resistance in the pipe and a capillary structure that guides the condensed liquid back to the evaporator. As a result, when the heat absorption of the heat-absorbing section is very large, the heating section will not be able to obtain sufficient liquid supply due to the limitation of the capillary force limit.

Invention content:

The object of the present invention is to provide a pulsating heat pipe suitable for cooling modern high energy consumption electronic equipment, which has small volume, light weight, low cost, convenient processing, strong heat transfer capacity, stable and reliable operation and no noise.

Technical scheme of the present invention is:

I. The pulsating heat pipe is composed of an aluminum unit plate 1 and a flat plate 2; one side of the aluminum unit plate 1 is milled with a group of thick straight tubes 3 arranged parallel to each other, a group of thin straight tubes 4 and a group of connecting curved channels 5, Thus, the capillary groove is formed; the flat plate 2 covers the unit plate 1, thus the capillary groove becomes a closed cavity; the closed cavity is filled with 30% to 70% of working fluid; the curved channel 5 at one end serves as the heating section 6 of the heat pipe, and the other The curved channel 5 at one end is used as a heat dissipation section 7 of the heat pipe; the channel between the heating section 6 and the heat dissipation section 7 is used as an adiabatic section of the heat pipe.

II. The pulsating heat pipe is composed of a group of thick straight pipes 14 and thin straight pipes 15 arranged parallel to each other, and each adjacent two pipes are connected by an elbow 16; Form a one-way plug-like flow in the heating section 17, absorb heat and evaporate, and release heat and condense in the heat dissipation section 18.

The invention has the advantages that the pulsating heat pipe has high heat transfer limit and low thermal resistance, and has the advantages of light weight, low cost, convenient processing, reliable operation and no noise, and is suitable for cooling modern high-energy consumption electronic equipment.

Description of drawings:

Fig. 1 is a schematic structural view of the pulsating heat pipe of the present invention.

FIG. 2 is a sectional view of FIG. 1 .

Fig. 3 is a schematic structural view of the pulsating heat pipe of the present invention.

Fig. 4 is a schematic structural diagram of a circulation heat pipe.

Fig. 5 is a schematic structural diagram of a loop-type heat pipe.

Detailed ways:

Figure 1 and Figure 2 describe the structure of the pulsating heat pipe of the present invention. The pulsating heat pipe is composed of an aluminum unit plate 1 and a flat plate 2; one side of the aluminum unit plate 1 is milled with a group of thick straight tubes 3 arranged parallel to each other, a group of thin straight tubes 4 and a group of connecting curved channels 5. Capillary groove; the flat plate 2 covers the unit plate 1, and thus the capillary groove forms a closed cavity; the closed cavity is filled with 30% to 70% of the working fluid; the curved channel 5 at one end serves as the heating section 6 of the heat pipe, and the curved channel 5 at the other end The curved passage 5 serves as the heat dissipation section 7 of the heat pipe; the passage between the heating section 6 and the heat dissipation section 6 serves as the heat insulation section of the heat pipe.

When the pulsating heat pipe of the present invention is in operation, the heating end of the pulsating heat pipe is heated, and the heat dissipation end is cooled. Due to the thickness of the pipe, different flow resistances are formed, and the gas-liquid mixture formed by gasification of the working fluid at the evaporation end (gas-based ) selects the thick channel to flow upwards in a plug-like manner, and the mixture (mainly liquid) that is partially condensed in the condensation section selects a thin channel to flow downwards in a plug-like manner to form a continuous circulation flow; the evaporation and condensation of the working fluid in the pulsating heat pipe will Heat is transferred from the heating end to the cooling end; the working fluid in the entire closed cavity forms a liquid plug and an air plug under the action of surface tension, absorbs heat and evaporates in the heating section 6, grows into a large bubble 8, and the liquid plug 9 gradually becomes shorter; Under the action of the pressure difference between the heating section 6 and the heat dissipation section 8, the large air bubbles 8 entrain the short liquid plug 9 and flow to the heat dissipation section 7 along the thick channel 3: when they reach the heat dissipation section 7, the steam releases heat and condenses, and the air bubbles 8 become smaller , the liquid plug 9 becomes longer. Under the action of inertial force and gravity, the elongated liquid plug 12 and the reduced air bubbles 11 flow along the thin channel 4 to the heating section 6; when the air bubbles 8 and the liquid plug 9 reach the heating section 6, a cycle is completed. In the cycle, all air bubbles 8 and liquid plugs 9 flow in one direction. The working liquid continues to be heated and evaporated in the heating section to start the next cycle. The heat transfer is completed in the circulation of the working fluid.

Fig. 3 shows the structure of the pulsating heat pipe of the present invention. The pulsating heat pipe is composed of a group of thick straight pipes 14 and thin straight pipes 15 arranged parallel to each other, and each adjacent two pipes are connected by an elbow 16; the heat transfer working fluid is formed in the pipe under the pressure generated by the heat action. One-way plug flow, heat absorption and evaporation in the heating section 17, heat release and condensation in the heat dissipation section 18.

In the pulsating heat pipe of the present invention, the flow direction of the working fluid is restricted by alternately arranging the thick pipes and thin pipes, and the pressure difference under the action of heat makes a continuous one-way circulation flow in the pipes, and the flow direction of the air plug 8 and the liquid plug 9 are the same, and the flow resistance is very small. Therefore, the heat transfer is high, and the heat pipe can realize long-distance heat transfer.

In the operation of the heat pipe, there are no moving parts such as check valves, only the stable one-way circulation of the working fluid, which ensures its long-term reliable performance.

It is easy to realize miniaturization and easy production and processing. It only needs to form a capillary groove on a flat plate, or connect a group of thick pipes and thin pipes alternately, and the heat pipe is formed.

Claims (2)

1. A circulating flow type pulsating heat pipe for cooling electronic devices, characterized in that: the pulsating heat pipe is composed of an aluminum unit plate (1) and a flat plate (2); one side of the aluminum unit plate (1) is milled with parallel arrays A group of thick straight pipes (3), a group of thin straight pipes (4) and a group of connecting curved passages (5), the flat plate (2) covers the unit plate (1), forming a closed cavity; the closed cavity is filled with 30 % ~ 70% of the working fluid. 2. A circulating flow type pulsating heat pipe for cooling electronic devices, characterized in that: the pulsating heat pipe is composed of a group of thick straight pipes (14) and thin straight pipes (15) arranged in parallel to each other, and each two adjacent pipes Connect them with elbow (16).

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