CN115900403A - A loop heat pipe - Google Patents

Abstract

A loop heat pipe comprises an evaporator, a vapor pipeline, a condenser, a liquid pipeline and a compensator, wherein the evaporator and the compensator share an external shell, and a second capillary core is arranged in the compensator; the first capillary core is positioned in the evaporator, and a first steam cavity and a second steam cavity are formed between the evaporator and the shell; the vapor line communicates the first vapor chamber to the condenser; the liquid line communicates the condenser to the compensator; a secondary line communicating the second vapor chamber to the condenser or communicating the second vapor chamber to the liquid line is also included. When the loop heat pipe works, the heat leakage from the evaporator to the compensator is reduced, the requirement on the supercooling degree is reduced, and the heat transmission performance of the loop heat pipe is improved.

Description

A loop heat pipe

technical field

The invention relates to a heat transfer device, in particular to a loop heat pipe.

Background technique

Loop heat pipes are an advanced heat transfer element. When the loop heat pipe works, the pressure and temperature of its evaporator are higher than that of the compensator, so the evaporator leaks heat to the compensator. According to the working principle of the loop heat pipe, the heat needs to be offset by the subcooling of the return liquid to maintain the thermal balance of the compensator. However, this will increase the temperature difference between the cold and hot ends of the loop heat pipe and deteriorate the heat transfer performance. Therefore, it is necessary to reduce this heat leakage as much as possible. The heat conduction through the shell between the evaporator and the compensator and the capillary core of the loop heat pipe is an important source of the above heat load. Therefore, reducing the heat conduction is of great significance to improve the heat transfer performance of the loop heat pipe.

Contents of the invention

In view of this, the present invention provides a loop heat pipe, which can reduce the heat leakage from the evaporator to the compensator of the loop heat pipe, and improve its heat transfer performance.

The present invention adopts following technical scheme:

A loop heat pipe, comprising an evaporator, a gas pipeline, a condenser, a liquid pipeline and a compensator, characterized in that the evaporator and the compensator share an external casing, and the casing includes an upper casing and a The lower housing, the upper housing and the lower housing jointly define a closed chamber and are provided with a first capillary core, and the first capillary core separates the closed chamber into the evaporator and the a compensator, the first capillary core is located in the evaporator; the first capillary core includes a main part and a rest part, the main part is far away from the compensator, and forms a first steam chamber with the housing, The remaining part is close to the compensator and forms a second steam chamber with the housing; there is a second capillary core in the compensator, and the second capillary core is in contact with or connected to the first capillary core;

The first capillary wick isolates the second steam chamber from the first steam chamber to prevent gas-phase working fluid from circulating between the second steam chamber and the first steam chamber, and the first The capillary wick isolates the second steam chamber from the compensator to prevent gas-phase working fluid from circulating between the second steam chamber and the compensator;

the vapor line communicating the first vapor chamber to the condenser;

said liquid line communicating said condenser to said compensator; further comprising,

A secondary line communicating the second vapor chamber to the condenser, or communicating the second vapor chamber to the liquid line.

Optionally, the first capillary core is an integral capillary structure, and the rest of the first capillary core has a plurality of recessed structures, and the plurality of recessed structures are communicated with a groove to form the first capillary structure with the housing. Two steam chambers.

Optionally, the first capillary core is a powder sintered body.

Optionally, the first capillary core is formed by laminating multiple layers of capillary structure.

Optionally, there are through holes on the capillary structure layer, and the through holes on the adjacent capillary structure layers are at least partially overlapped to form a through channel. There is a channel on the capillary structure layer, and the channel communicates with the through passage to form the second steam chamber with the housing.

Optionally, the material of the capillary structure layer is one or more layers of wire mesh or metal fiber felt or metal foam, and the materials of the multiple layers of the capillary structure layer constituting the first capillary core are the same or different.

Optionally, the second capillary core is a part of the first capillary core, formed by extending the remainder of the first capillary core toward the compensator.

Optionally, the second capillary core is a separate capillary structure.

Optionally, the evaporator and the compensator are arranged horizontally or vertically.

Optionally, the shape of the main part of the first capillary core is a shape with a large surface area, such as a spade tooth shape.

Compared with the prior art, when the loop heat pipe of the present invention is working, the heat leakage from the evaporator to the compensator along the shell and the heat leakage from the first capillary core in the evaporator to the compensator will cause the working fluid Vaporized in the second steam chamber, absorbing the above heat load, the vaporized working fluid enters the secondary pipeline, condenses, and finally returns to the compensator. Therefore, the requirement for the subcooling degree of the liquid working medium in the evaporator is significantly reduced, and the performance of the loop heat pipe is improved.

Description of drawings

Fig. 1 is the schematic diagram of a kind of embodiment of a kind of loop heat pipe of the present invention;

Fig. 2 is a schematic diagram of the structure after the upper casing in Fig. 1 is opened;

3 is a schematic diagram of a first embodiment of a first capillary core and a second capillary core in the present invention;

4 is a schematic diagram of a second embodiment of the first capillary core and the second capillary core in the present invention;

FIG. 5 is an exploded view of FIG. 4 .

In the above figure: 1-evaporator, 2-vapor pipeline, 3-condenser, 4-liquid pipeline, 5-compensator, 6-secondary pipeline, 11-first capillary core, 51-second capillary core, 12 - first steam chamber, 13 - second steam chamber, 111 - main part of first wick, 112 - remainder of first wick, 110, 110a, 110b, 110c, 110d - capillary structure layer, 1121 - recessed structure , 1122 - groove, 1123 - through hole, 1124 - through channel, 1125 - channel, 100 - shell, 101 - upper shell, 102 - lower shell.

Detailed ways

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. This embodiment is carried out on the premise of the technical solution of the present invention, and the detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

Please refer to FIG. 1 and FIG. 2 , which are schematic diagrams of an embodiment of a loop heat pipe according to the present invention. It comprises, evaporator 1 , vapor line 2 , condenser 3 , liquid line 4 , compensator 5 and secondary line 6 . The evaporator 1 and the compensator 5 share an external casing 100 , and the casing 100 includes an upper casing 101 and a lower casing 102 . The upper casing 101 and the lower casing 102 form a closed chamber, and there is a first capillary wick 11 inside, and the first capillary wick 11 separates the closed chamber into an evaporator 1 and a compensator 5 . The first wick 11 comprises a main part 111 of the first wick and a remainder 112 of the first wick. The main part 111 of the first capillary wick is far away from the compensator 5 and the remaining part 112 of the first capillary wick is close to the compensator 5 .

The second capillary wick 51 is located inside the compensator 5 . The first capillary core 11 is in contact with or connected to the second capillary core 51 .

The main part 111 of the first capillary wick and the housing 100 enclose the first steam chamber 12 . The remaining part 112 of the first capillary core and the housing 100 enclose the second steam chamber 13 . The gas line 2 communicates with the first vapor chamber 12 and the condenser 3 , and the liquid line 4 communicates with the condenser 3 and the compensator 5 . In this embodiment, the secondary pipeline 6 communicates with the second steam chamber 13 and the condenser 3 . But not limited thereto, the secondary pipeline 6 can also connect the second steam chamber 13 to the liquid pipeline 4 .

The shape of the main part 111 of the first capillary core is a shape with a large surface area, such as a spade tooth shape.

In this embodiment, the evaporator 1 and the compensator 5 are arranged horizontally, but not limited thereto, the evaporator 1 and the compensator 5 may also be arranged vertically.

The basic working principle of the present invention: the lower housing 102 at the evaporator 1 is in contact with the heat source, so that the evaporator 1 absorbs heat, the working medium in the first steam chamber 12 is vaporized, and the vaporized working medium enters along the gas pipeline 2 The condenser 3 returns to the compensator 5 along the liquid line 4 after exothermic condensation in the condenser 3, and returns to the evaporator 1 under the capillary force of the first capillary wick 11 and the second capillary wick 51, thus completing One cycle. At the same time, since the temperature and pressure in the evaporator 1 are higher than the temperature and pressure of the working fluid in the compensator 5, the evaporator 1 conducts heat to the compensator 5 through the housing 100 and the first capillary core 11, and conducts heat to the second In the steam chamber 13, the working medium in the second steam chamber 13 is vaporized by heat and absorbs the heat, and then the gas-phase working medium flows into the condenser 3 along the secondary pipeline 6, and after exothermic condensation in the condenser 3, it flows through the steam The condensed working medium in the pipeline 2 returns to the compensator 5 through the liquid pipeline 4, and returns to the evaporator 1 under the action of the capillary force of the first capillary wick 11 and the second capillary wick 51, thereby completing a cycle. In this way, the amount of heat leaked from the evaporator 1 into the compensator 5 is significantly reduced. Therefore, the requirement for the subcooling degree of the liquid working medium in the evaporator 1 is significantly reduced, so that the performance of the loop heat pipe is improved.

Please refer to FIG. 3 , which is a schematic diagram of a first embodiment of the first capillary core and the second capillary core in the present invention. The first capillary core 11 is an integral capillary structure, which includes a main part 111 of the first capillary core and a remaining part 112 of the first capillary core. The remaining part 112 of the first capillary core has a plurality of recessed structures 1121 , and the recessed structures 1121 communicate with each other through grooves 1122 , and together with the housing 100 (not shown in the figure) enclose the second steam chamber 13 . The first capillary core 11 can be a powder sintered body, but not limited thereto. The second capillary core 51 can be a part of the first capillary core 11 and is formed by extending the remainder 112 of the first capillary core toward the compensator 5 . But not limited thereto, the second capillary core 51 can also be a separate capillary structure, which can be formed by sintering powder on the lower housing 102 (not shown in the figure), and is in contact with the first capillary core 11 . The main part 111 of the first capillary wick is spade-toothed.

Please refer to FIG. 4 and FIG. 5 , which are schematic diagrams of a second embodiment of the first capillary core and the second capillary core in the present invention. The first capillary core 11 is formed by laminating multiple capillary structure layers 110, and forms a main part 111 of the first capillary core and a remainder part 112 of the first capillary core. There are a plurality of through holes 1123 on the capillary structure layer 110 , and the through holes 1123 on adjacent capillary structure layers such as the capillary structure layer 110 b and the capillary structure layer 110 c are partially overlapped to form a through channel 1124 . There is a channel 1125 on the capillary structure layer 110 a close to the housing 100 (not shown in the figure), and the channel 1125 communicates with all the passages 1124 and forms the second steam chamber 13 with the housing 100 . In this embodiment, the second capillary core 51 is a part of the first capillary core 11 and is formed by extending the capillary structure layer 110d close to the lower casing 102 (not shown in the figure) toward the compensator 5 .

The capillary structure layer 110 is made of one or more layers of wire mesh or metal fiber felt or metal foam. The materials of the capillary structure layers 110a, 110b, 110c and 110d are the same or different.

The through-holes 1123 on the adjacent capillary structure layer 110 are partially overlapped compared with complete overlap, and the through-channel 1124 formed by it has a larger surface area, which can absorb more heat leakage from the first capillary core 11 to the compensator 5, and the effect is better. .

Based on the above-mentioned embodiments of a loop heat pipe of the present invention, the present invention can significantly reduce the heat leakage from the evaporator to the compensator through the shell and capillary core, and improve its heat transfer performance.

Finally, it should be emphasized that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the principles and principles shall be included within the protection scope of the present invention.

Claims (10)

1. A loop heat pipe comprising an evaporator, a gas line, a condenser, a liquid line and a compensator, wherein the evaporator and the compensator share an external housing, and the housing includes an upper shell body and a lower casing, the upper casing and the lower casing jointly define a closed chamber and are provided with a first capillary wick, and the first capillary wick separates the closed chamber into the evaporator and the In the compensator, the first capillary core is located in the evaporator; the first capillary core includes a main part and a rest part, the main part is far away from the compensator, and forms a first vapor with the housing cavity, the remaining part is close to the compensator, and forms a second steam cavity with the housing; there is a second capillary core in the compensator, and the second capillary core is in contact or connected with the first capillary core ; The first capillary wick isolates the second steam chamber from the first steam chamber, so as to prevent gas-phase working fluid from circulating between the second steam chamber and the first steam chamber, and the first The capillary wick isolates the second steam chamber from the compensator to prevent gas-phase working fluid from circulating between the second steam chamber and the compensator; the vapor line communicating the first vapor chamber to the condenser; said liquid line communicating said condenser to said compensator; further comprising, A secondary line communicating the second vapor chamber to the condenser, or communicating the second vapor chamber to the liquid line. 2. A kind of loop heat pipe according to claim 1, characterized in that: The first capillary core is an integral capillary structure, and the rest of the first capillary core has a plurality of recessed structures, and the plurality of recessed structures communicate with the housing through a groove to form the second steam chamber. 3. A kind of loop heat pipe according to claim 2, characterized in that: The first capillary core is a powder sintered body. 4. A kind of loop heat pipe according to claim 1, characterized in that: The first capillary core is formed by laminating multiple layers of capillary structure. 5. A kind of loop heat pipe according to claim 4, characterized in that: There are through holes on the capillary structure layer, and the through holes on the adjacent capillary structure layers are at least partially overlapped to form a through channel, on the capillary structure layer close to the upper shell or close to the lower shell There is a channel, and the channel communicates with the through channel to form the second steam chamber with the housing. 6. A loop heat pipe according to claim 4 or 5, characterized in that: The material of the capillary structure layer is one or more layers of wire mesh, metal fiber felt or metal foam, and the materials of the multiple layers of the capillary structure layer constituting the first capillary core are the same or different. 7. A loop heat pipe according to claim 1, characterized in that: The second capillary core is a part of the first capillary core and is formed by extending the remainder of the first capillary core toward the compensator. 8. A loop heat pipe according to claim 1, characterized in that: The second capillary core is a separate capillary structure. 9. A loop heat pipe according to claim 1, characterized in that: The evaporator and the compensator are arranged horizontally or vertically. 10. A loop heat pipe according to claim 1, characterized in that: The shape of the main part of the first capillary core is a shape with a large surface area, such as a spade tooth shape.

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