KR200337398Y1 - Heat-pipe having a cotton-wick - Google Patents

Abstract

The present invention is a heat pipe having a container on a hollow pipe having both ends of the longitudinal direction closed and sealed to achieve a vacuum state, one end of the longitudinal direction is formed with a heat-absorbing portion for the heat is absorbed, the other end The present invention relates to a container, comprising: a cotton body disposed in the container in the longitudinal direction to guide the movement of the working fluid, and a fixing member disposed in the container in the longitudinal direction to fix the cotton body. Cottonwick; It is characterized in that it comprises a working fluid which is accommodated in the container and repeats evaporation and condensation while circulating between the heating part and the radiating part by heat from the outside.

Accordingly, by using the cotton wick, it is possible to circulate the working fluid irrespective of the gravity direction to improve the heat exchange efficiency, as well as to simplify the manufacturing and to reduce the manufacturing cost.

Description

Heat pipe with cotton wick {HEAT-PIPE HAVING A COTTON-WICK}

The present invention relates to a heat pipe having a cotton wick, and more particularly, by forming a wick using cotton, not only to improve heat transfer efficiency, but also to simplify manufacturing and reduce costs. A heat pipe having a cotton wick.

Heat pipe is made by injecting a working fluid with low boiling point and high evaporation latent heat into a metal tube in a vacuum state.The heat pipe can be easily changed from liquid to vapor under low pressure. It is a device that transfers heat with latent heat. Heat pipe has a working temperature range of 0 ° C to 200 ° C and can be used as an efficient heat transfer element for general air conditioning and heating, cooling of electronic devices, waste heat recovery in the middle temperature range, and solar heat collection. The advantage of heatpipes is that they can deliver up to thousands of times the thermal conductivity of copper without a separate power source.

The heat pipe is formed by encapsulating a small amount of working fluid, which is an evaporation medium, inside a container that is sealed at both ends to form a vacuum. The working fluid mainly uses methanol, acetone, and water (distilled water).

One end of the container forms a heating portion to which heat is applied, and the other end forms a heat dissipation portion from which heat is released. Here, in the heating section, heat is applied to the working fluid to evaporate and convert to a vapor state, and the working fluid in the vapor state condenses as it reaches the heat dissipating unit while releasing heat, is converted into a liquid phase, and then returns to the heating section. As this cycle is repeated, heat from the heating portion is transferred to the heat dissipation portion, whereby rapid superheat conduction occurs to have the same temperature throughout the heat pipe, and the heat transfer rate at this time occurs very quickly at a speed close to the speed of sound.

The performance of the heat pipe may be affected by various variables such as the type and amount of injection fluid, the vacuum and cleanliness of the pipe body, that is, the container, but the performance of the heat pipe depends on the circulation capacity of the working fluid. . Therefore, in order to improve the circulation capacity of the working fluid, a mesh screen type wick attached with a dense and thin metal mesh inside the container is installed, or a groove having a dense and fine groove formed on the inner wall of the container. Or a sintered wick in which the metal powder is coated and sintered to a predetermined thickness on the inner wall of the container. By drawing in the wick or processing the groove in the inner wall, the capillary force is generated to circulate the working fluid so that the temperature of the heat absorbing portion and the condensation portion can be kept isothermal.

However, such a conventional heat pipe has a structure in which heat is transferred from the heat absorbing portion to the condensing portion by using latent heat emitted by a phase change of the working fluid, and thus the evaporation and return process are carried out inside the container. If heat transfer from the condenser to the heat absorbing part is required in the opposite direction of gravity, friction occurs between working fluids in the condenser, which causes problems in actual application due to a large heat loss even when it is not operated or operated. In addition, heat transfer is easily performed in a state in which heat pipes are arranged vertically. However, when heat pipes are arranged horizontally, heat transfer is not performed properly.

In the case of mesh screen type heat pipes, it is difficult to manufacture when the heat pipe is thin or long because a thin permeable metal mesh is attached to the inner wall in manufacturing, with the disadvantage that the transmittance is small, the pressure loss is large and the thermal resistance is large. There is a disadvantage that the manufacturing cost increases. In the case of forming the groove, the capillary diameter is large, so the capillary force is small, the operating capacity is low in the partially overheated dry state, and the boiling limit is suddenly generated, resulting in a sudden temperature rise.

On the other hand, in the case of sintered wicks, the constituent particles and the particles are very dense so that capillary forces are generally higher than that of grooved wicks or mesh screen wicks, and thermal conductivity is relatively higher than that of mesh screen wicks. Heat flux performance. In addition, the heat transfer is relatively smooth even when the heat pipe is disposed in the heat transfer direction in the reverse direction or horizontally, but the manufacturing process is complicated, the price increases, and the weight is heavy. have.

Therefore, the capillary phenomenon is excellent to facilitate heat transfer even when the heat pipe is horizontally disposed, and it is necessary to manufacture the wick with a new material that is easy to manufacture and can reduce the cost.

Accordingly, it is an object of the present invention to provide a heat pipe having a cotton wick that enables heat transfer to be smooth even in a state where the heat pipes are horizontally arranged, and is easy to manufacture and to reduce cost.

1 is a side cross-sectional view of a heat pipe according to an embodiment of the present invention,

FIG. 2 is a front sectional view of the heat pipe of FIG. 1;

3 is a side cross-sectional view of a heat pipe according to another embodiment of the present invention;

4 is a front sectional view of the heat pipe of FIG. 3;

Figure 5 is a side cross-sectional view of a heat pipe according to another embodiment of the present invention,

FIG. 6 is a sectional front view of the heat pipe of FIG. 5.

* Explanation of symbols for the main parts of the drawings

10 heat pipe 11: container

13 working fluid 15, 25 support rod

17, 27, 37: Cotton body 20, 30, 40: Cottonwick

35: support plate

The object is, according to the present invention, both ends of the longitudinal direction is closed to achieve a vacuum state, a heat dissipation portion (a) is formed at one end of the longitudinal direction to absorb heat and the other end of the heat dissipation ( In the heat pipe having the container 11 on the hollow pipe in which b) was formed, it is arranged in the container 11 along the longitudinal direction and guides the movement of the working fluid 13 to the cotton body 17, 27, 37, and cotton wicks 20, including fixing members 15, 25, and 35 arranged in a lengthwise direction of the container 11 to fix the cotton bodies 17, 27, 37. 30,40); Cottonwick, which is contained in the container 11 and includes a working fluid 13 for repeating evaporation and condensation while circulating between the heating part a and the heat radiating part b by heat from the outside. Achieved by a heat pipe having

Here, the fixing member 15 is formed in the shape of a hollow pipe, the cotton body (17, 27, 37) is preferably inserted in the pipe along the longitudinal direction.

The fixing member 25 is formed in a rod shape, the cotton body 17, 27, 37 may be attached to the outer peripheral surface of the rod over the entire area along the longitudinal direction.

The fixing member 35 is formed in a long plate shape along the longitudinal direction, the cotton body (17, 27, 37) may be long attached to the both sides of the plate in the longitudinal direction.

The cotton bodies 17, 27, 37 are preferably woven by braiding cotton yarn.

Hereinafter, with reference to the accompanying drawings will be described in detail for the subject innovation.

Heat pipe with this cotton wick, by braiding cotton yarn with excellent capillary phenomenon to the fixing member to form a cotton wick, heat transfer is possible even if the container is placed in the reverse or horizontal direction of the heat transfer direction, and is easy to manufacture. Cost can be reduced.

1 is a side cross-sectional view of a heat pipe having a cotton wick in accordance with an embodiment of the present invention, Figure 2 is a front sectional view of FIG. As shown, the heat pipe 10 has a container 11 formed of a long metal pipe on one side, and the working fluid 13 formed of methanol, acetone, water (distilled water), etc. is formed in the container 11. It is accepted.

The container 11 has a heating portion (a) to which heat is applied to one end of the container 11 along the longitudinal direction, and a heat dissipation portion (b) to which heat is discharged to the other end. When heat is applied to the heating part a, the working fluid 13 in the container 11 is evaporated and converted into a vapor state, and the working fluid 13 in the vapor state moves along the longitudinal direction of the container 11. When the heat exchanges with the container 11, the temperature gradually decreases, and when it reaches the heat radiating part b, it is converted into a liquid phase.

The cotton wick 20 is mounted in the inner hollow of the container 11 along its longitudinal direction. 1 and 2, the cotton wick 20 is a support rod 15, which is a fixing member formed in a pipe shape having both sides opened, and a cotton body uniformly disposed in the support rod 15 along the longitudinal direction. (V) 17.

The support rod 15 is formed of a metal tube or a plastic tube to support a cotton body 17 having little support force when immersed in a liquid, and the length of the support rod 15 is a heating part (a) and a heat radiating part (b) of the container 11. It is formed long enough to connect. Cotton body 17 is formed of a braided type braided cotton yarn, the width thereof is formed almost the same as the inner diameter of the support bar 15 to be inserted into the support bar 15 uniformly. The length of the cotton body 17 is formed longer than the length of the support bar 15, the knot is formed on the outside of the support bar 15 on both ends of the cotton body 17, the cotton body 17 is the support bar 15 To prevent deviations from or uneven placement. At this time, the both ends of the cotton body 17 are formed long enough to make direct contact with both ends of the container 11, that is, the heating part a and the heat dissipation part b, thereby heating the a part and the heat dissipating part b. The circulation of the working fluid 13 between) can be performed smoothly. In addition to the knot, the end of the cotton body 17 can be fixed with a clip or an O-ring, and of course, and the end of the cotton body 17 is formed long enough to fix the end of the cotton body 17 even when the clip or O-ring is fixed. Both ends are in contact with the heating part (a) and the heat dissipation part (b), respectively. On the other hand, since the cottonwick 20 is accommodated without a separate fixing device inside the container 11, the cottonwick 20 is disposed adjacent to the lower region of the container 11 at the position where the heat pipe 10 is mounted, and accordingly, It is maintained to some extent immersed in the working fluid (13).

By such a configuration, when the heating part a of the heat pipe 10 is heated, the working fluid 13 phase changes to a vapor state while evaporating, and the working fluid 13 phase changed to a vapor state is a heat pipe 10. Heat exchange with the container 11 while moving the upper region of the () along the longitudinal direction. Accordingly, when the heat dissipation part b reaches the working fluid 13, the working fluid 13 changes to a liquid phase, and the working fluid 13 changed into the liquid phase is the cotton body 17 of the cotton wick 20 extending to the end of the container 11. The absorbed working fluid 13 moves directly along the cottonwick 20 and returns to the heating part a. Then, in the heating part (a), the working fluid 13 immediately evaporates in the vapor state in the state absorbed by the cottonwick 20.

Since the cottonwick 20 is formed of pure cotton, the cottonwick 20 has excellent capillary phenomenon due to its unique porous structure, and thus, the absorbing force of the working fluid 13 inside the container 11 is high, which almost affects the direction of gravity. Do not receive. Therefore, even when the heat pipe 10 is disposed in the reverse direction of the gravity direction or the heat pipe 10 is disposed horizontally, as in the heat dissipating part b, the heating part a is disposed at the bottom, the working fluid The circulation of (13) takes place smoothly. In addition, since the material itself is in a pure state, unlike synthetic yarns, there is no possibility of chemical reactions such as deterioration or foaming inside the container 11, and thus the life of the heat pipe 10 may be extended. Can be.

Meanwhile, in the above-described embodiment, the cotton wick 20 is formed by inserting the cotton body 17 into the supporting rod 15 having the fixing member in a pipe shape, which is a hollow body, as shown in FIGS. 3 and 4. , The fixing member is formed of a rod-shaped support rod 25, and the cotton body 27 may be mounted to surround the outer surface of the support rod 25 to form the cottonwick 30. Accordingly, when weaving the cotton body 27, a ball for inserting the support rod 25 into which the support rod 25 can be inserted is formed in the central region, or the outer surface of the support rod 25 with the support rod 25 placed thereon. Cotton wick 30 can be manufactured using a method of weaving cotton body 27 directly.

In addition, as shown in Figures 5 and 6, the fixing member may be manufactured in a plate shape without forming a pipe or a rod. When the support plate 35 is manufactured, the cotton bodies 37 are disposed on both sides of the support plate 35 so that the working fluid 13 is absorbed and circulated on both sides of the support plate 35, and the support plate 35 is disposed. By making the width of N) narrower than the width of the container 11, the cottonwick 40 can always be located at the bottom in the container 11.

As described above, the heat pipe 10 having the cotton wicks 20, 30 and 40 is made of cotton wicks using cotton bodies 17, 27 and 37 braided with cotton yarn inside the container 11. By attaching (20, 30, 40), it is possible to utilize the properties of porous cotton having excellent water absorption. In other words, by extending the cottonwick (20, 30, 40) to both ends of the container 11 to facilitate the return of the working fluid 13 from the heat radiating portion (b) to the heating portion (a), the working fluid (13) In addition to improving the circulation speed, the heat pipe 10 may be arranged in a reverse direction with respect to the gravity direction, or horizontally, so that the working fluid 13 may be circulated.

On the other hand, in the case of using the cotton wick (20, 30, 40) by simply mounting the cotton body (17, 27, 37) to the fixing member, which is generated when using a mesh screen type wick or sintered wick conventionally Not only manufacturing difficulties can be prevented, but manufacturing costs can be reduced.

On the other hand, conventionally employing the heat pipe (10) when used as a heating material, such as home heating, agricultural heating, etc., in order to assist the return of the working fluid 13 to install the heat pipe 10 inclined to be located away from the heat source The end side of the heat pipe 10 is set high and used. Accordingly, the installation process is complicated, there is a problem that the floor should be designed to a predetermined thickness or more in order to install the heat pipe 10 inclined.

However, in the case of using the heat pipe 10 having the cotton wick 20, 30, 40, even if the heat pipe 10 is installed horizontally, the heat exchange is smooth, so that the heat pipe 10 does not need to be inclined and installed on the floor. You may design thinner. Therefore, the installation work is simple and the equipment cost is reduced.

As described above, according to the present invention, by using the cotton wick (20, 30, 40), the working fluid 13 can be circulated regardless of the gravity direction to improve the heat exchange efficiency, it is easy to manufacture And manufacturing cost can be reduced.

Claims (5)

Both ends of the longitudinal direction are closed and sealed to form a vacuum state, and a heating pipe (a) is formed at one end of the longitudinal direction to absorb heat, and a heat pipe (b) having a heat dissipation part (b) at which the other end is discharged. In the heat pipe having 11), A cotton body (17, 27, 37) and the cotton body (17, 27, 37) for guiding the movement of the working fluid 13 is disposed in the container 11 in the longitudinal direction to fix the cotton body (17, 27, 37) Cotton wick (20, 30, 40) including a fixing member (15, 25, 35) disposed long along the longitudinal direction of the container (11); Cottonwick, which is contained in the container 11 and includes a working fluid 13 for repeating evaporation and condensation while circulating between the heating part a and the heat radiating part b by heat from the outside. Heat pipe having. The method of claim 1, The fixing member (15) is formed in the shape of a hollow pipe, and the cotton body (17, 27, 37) is a heat pipe having a cotton wick, characterized in that inserted along the longitudinal direction in the pipe. The method of claim 1, The fixing member 25 is formed in a rod shape, and the cotton body 17, 27, 37 is attached to the outer circumferential surface of the rod over the entire area along its length direction, the heat having a cotton wick pipe. The method of claim 1, The fixing member 35 is formed in a long plate shape along the longitudinal direction, the cotton body (17, 27, 37) has a cotton wick characterized in that it is attached to the both sides of the plate long along the longitudinal direction Heat pipe. The method according to any one of claims 1 to 4, The cotton body (綿) (17, 27, 37) is a heat pipe having a cotton wick, characterized in that woven by braided cotton yarn.