JPS61143689A - Heat pipe - Google Patents

Abstract

PURPOSE:To enable to control the quantity of heat transfer by a method wherein a U-shaped bend is formed in a heat insulating section and the titled heat pipe is rotated. CONSTITUTION:A heat pipe consists of a heat absorbing or evaporator section A, a heat insulating section B and a heat releasing or condenser section C. A bend 3 is formed in the heat insulating section B. The quantity of heat transfer can be controlled within the range from 0 to the maximum capacity of a heat pipe, which is constituted so as to be able to rotate at least 90 deg., due to the formation of the bend 3. Concretely, when the bend 3 is in the horizontal plane, the maximum capacity on the heat transfer of the heat pipe is shown, because no portion of working fluid obstructs the motive power of the heat pipe. When the U-shaped bend 3 is in the vertical plane, the liquid fills up the U-shaped portion by gravity, resulting in producing no shifting of evaporated gas from the heat absorbing or evaporator section A to the heat releasing or condenser section C and the same time no returning of condensed working liquid to the heat releasing or condenser section C and accordingly no heat transfer is resulted. When the minimum quantity of heat transfer (a) (not equal to 0) is desired, the proper depth of the U-shape and the proper quantity of working liquid are the answer for it. When the wanted value of control lies within the range from 0 to the maximum value of the quantity of heat transfer of the pipe, only thing to do is to select the proper angle of inclination of the U-shaped bend of the heat pipe within the range of 90 deg. of from the horizontal position to the vertical position of the bend.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a horizontally arranged heat pipe in which heat transfer m is variable.

(Prior Art and Problems to be Solved) In conventional heat pipes, whether they are thermosiphon type or loop type, it is difficult to control the amount of heat transferred. The reason is that heat pipes operate without energy, so the structure of the pipe, the type of working fluid sealed in the pipe, and its condition II! The maximum amount of heat that can be transferred is determined by (pressure and fIi), and Il! given to the endothermic evaporator within that range! I!
This is because the maximum amount of heat depending on the state of I and the heat radiation condensing section is naturally transferred.

However, for example, a greenhouse that receives heat using heat pipes,
Rooms that receive heating have their own amount of heat required, which is different from the amount of heat naturally transferred by heat pipes, so some kind of control is necessary.
There are many cases like this.

Structurally, a heat pipe encloses a working fluid in a sealed container and utilizes natural circulation through the cycle of vaporization and liquefaction of the working fluid, so it is necessary to provide a backing, a fludge, etc. inside the sealed container to control these. Although it is conceivable that a sealed container incorporating such a function would have problems such as a decrease in maintainability due to leakage, a decrease in the performance of the heat pipe, and an increase in cost, it would be difficult to use a conventional structure. It has been a long-standing challenge to provide a control mechanism to the device itself.

(Means for Solving the Problems) The present invention solves the above-mentioned problems and provides a heat pipe with a variable amount of heat transfer, which has achieved the long-standing problem. A U-shaped bent portion is formed in the holder so that it can be rotated by at least 90 degrees.

(Embodiment) FIG. 1 is an explanatory diagram of an embodiment of the heat pipe of the present invention, and the heat pipe is composed of a heat-absorbing evaporator section (A), a heat-insulating section (B), and a heat-dissipating condensing section (C). (1) is a closed container whose internal space is filled with a working fluid such as water, and ■ is a fin provided for heat absorption or heat radiation in the endothermic evaporation section (A) and heat dissipation condensation section (C). There is no need to provide
Also, if necessary, it may be provided only on either side. ■
is a U-shaped bent part formed in the heat insulating part (B), (4 indicates that it is rotatable).

In this way, the bent part (3) is attached to the heat pipe insulation part (B).
The heat pipe configured to be able to rotate at least 90 degrees can control the amount of heat transfer from O to the maximum capacity of the heat pipe.

Fig. 2 is an explanatory diagram of another embodiment of the heat pipe of the present invention, in which the heat absorption evaporation part (A) and the heat radiation condensation part (C) are the same as in Fig. 1, but are formed in the heat insulation part (B). Two U-shaped bent portions (3') are formed in series. In this way, the bent portion (3') may be formed by combining a plurality of U-shapes.

Examples of use of the heat pipe of the present invention will be described below.

Figure 3 is an explanatory diagram when using the maximum load, (A) is a top view,
(b) is a side view. By locating the bent portion (3) in the horizontal direction as shown in the figure, there is no part where the working fluid opposes gravity, and the heat transfer of the heat pipe exhibits its maximum capacity.

Figure 4 is an explanatory diagram when heat transfer is stopped, (A) is a top view, (
B) is a side view. The figure shows the heat pipe in Figure 3 at 90
The U-shaped bend (3) is located in the vertical direction. In this case, the liquid fills the U-shaped part due to gravity, and the vaporized gas does not move from the endothermic evaporation section (A) to the heat dissipation condensation section (C), and the condensed working liquid returns to the heat dissipation condensation section (A). heat transfer is lost.

As mentioned above, in order to stop the heat transfer in the heat pipe, it is sufficient to select a working fluid suitable for the operating temperature range and design the amount of the working fluid, the depth of the U-shape, and the method of attaching the wick. The depth of the U-shape can be practically determined based on the above by putting a slightly larger amount of working fluid than the pipe into a closed container.

If the minimum amount of heat transfer is set to α (≠0), it is sufficient to find the depth and liquid volume of such a U-shape, and to control the amount of heat transfer between 0 and the maximum, use the U-shaped bending of the heat pipe. The angle may be selected appropriately between 30 degrees from horizontal to vertical. In addition,
Effects of the U-shaped bent part In order to especially increase the stopping effect and improve the efficiency of the heat pipe, at least no wick is provided in the U-shaped bent part, and if necessary, a heat insulating part and a It is preferable that no wick be provided in the heat dissipation and condensation portion.

(Effects of the Invention) According to the heat pipe of the present invention described above, the amount of heat transfer can be controlled by forming a U-shaped bent part in the heat insulating part and rotating it, so that the heat pipe can be manufactured easily. It has advantages such as easy operation and low cost.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams of an embodiment of the heat pipe of the present invention, and FIGS. 3 and 4 are explanatory diagrams of an example of use of the heat pipe of FIG. 1, in which (A) is a top view. , (b) is a side view. 1... Airtight container, 2... Fin, 3... U-shaped bent part. Box 1 Figure 2 Fan 3 Figure Procedure Amendment (Method) April 3, 1985 1. Indication of the case 1988 Patent Application No. 266844 2. Name of the invention Heat pipe 3. Person making the amendment Relationship to the incident Patent applicant address 5-15 Kitahama, Higashi-ku, Osaka Name (
213) Sumitomo Electric Industries, Ltd. Representative President Tetsu Kawakami Department 4, Agent address: Nishinakajima, Yodoyo-ku, Osaka! The lower part No. 3, No. 20, No. 6, the drawing to be corrected, 7, and the content of the correction, Figure 3, will be corrected as shown in the attached sheet.

Claims (3)

[Claims] (1) A heat pipe characterized in that a U-shaped bent part is formed in the heat insulating part of the horizontally arranged heat pipe so that the heat pipe can be rotated by at least 90 degrees, thereby making the amount of heat transfer variable. (2) The heat pipe according to claim 1, wherein the bent portion is formed by a plurality of continuous U-shapes. (3) The heat pipe according to claim 1, characterized in that there is no wick at least from the bent portion or from the bent portion to the heat dissipation and condensation portion.