JPH02238295A - heat pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Icheon Field) This invention relates to a heat pipe. [Conventional d technology and its problems] Aluminum pipes are easily corroded by water, steam, methanol, etc. For this reason, when aluminum pipes are used as container pipes for heat pipes, water or methanol, which have a high heat transfer ability and are inexpensive and safe, cannot be used as the working fluid, and the working fluid is limited to fluorocarbons, etc. There was a problem that

Therefore, the present invention aims to provide a heat vibrator that can use water or methanol as a working fluid. (Means for solving the problem and their effects) The above il
The measures taken to solve the problem are as follows. That is, the heat pipe of Jin's invention has a container as a composite pipe having a lead layer formed by expanding the diameter of a lead pipe and adhering it tightly to the inner surface of a corrugated metal pipe, and a working fluid is sealed in the container.

Therefore, since the hydraulic fluid comes into contact with the lead layer, which has good corrosion resistance, the type of hydraulic fluid is not limited, and water or methanol can be used as the hydraulic fluid. [Example] Next, an example of the heat pipe according to the present invention will be described.

The heat pipe according to the present invention uses a composite pipe 1 as a container, which has a lead layer 4 made by expanding the diameter of a lead pipe 3 and tightly adhering it to the inner surface of a corrugated metal pipe 2, and has a working fluid sealed in the container. be. The material for the corrugated metal tube 2 is as follows:
Steel, stainless steel, copper, etc. can be used. Further, as a material for forming the lead pipe 3, lead or a lead alloy (Cu+Te alloy, C alloy, 'AC alloy, so-called solder, etc.) that can be continuously extruded can be used.

As shown in FIG. 2, the outer peripheral surface of the corrugated metal tube 2 is coated with extruded polyethylene, which improves the corrosion resistance of the outer surface of the corrugated metal tube 2 and also serves as a heat-retaining layer in some cases.
A protective layer 5 made of polyvinyl chloride, polybutene, nylon, or the like, or one or more layers of fused polyethylene tape, rubberized cloth tape, etc., wound by taping is provided. Alternatively, in order to efficiently exchange heat on the outer peripheral surface of the corrugated metal tube 2, the protective layer 5 having heat insulating properties is not provided on the corrugated metal tube 2, or in such a case, the atmosphere around the outer circumference of the metal tube 2 may be is a corrosion-resistant gas, such as so. , When there is a risk of contact with liquids such as SOs, sewage, chemical solutions, or water vapor, the outer surface of the corrugated metal tube 2 should be It is preferable to provide a protective layer 5 made of a lead pipe. When the protective layer 5 is made of lead or a lead alloy, as described above, the thermal conductivity between the inner and outer surfaces of the composite pipe 1 is particularly good. Furthermore, when heat insulation is required, the protective layer 5 is formed of a foamed plastic insulation layer such as foamed polystyrene or foamed polyethylene, or a insulation layer such as glass wool or asbestos. In this case, as shown in FIG. 3, on top of the protective layer 5 made of heat insulating material,
The second protective layer 6, which has the functions of shape retention, trauma prevention, waterproofing, corrosion resistance, and heat insulation, is formed by extruding polyethylene, polyvinyl chloride, polyptene, nylon, etc., or is made of fused polyethylene tape, rubber bow cloth tape, etc. It is very preferable to form it by taping. Furthermore, although not shown here, a heat insulating layer is applied to the necessary portions of the outer periphery of the lead pipe 3, and then the corrugated metal pipe 2 is covered, and the diameter is expanded, and the lead layer 4 is applied to the metal pipe 2 through the heat insulating layer. You can also place them in close contact. Particularly, when providing the protection N5 by the lead pipe on the outer periphery of the metal pipe 2 for corrosion resistance, the present method of sandwiching a heat insulating layer between the lead pipe 4 and the metal pipe 2 is effective.

In addition, instead of the heat insulation layer, the purpose is to eliminate so-called electrical corrosion between the lead layer 4 and the metal pipe 2 over the entire length of the composite pipe,
An insulating tape or paint that eliminates electrical connection for the purpose of energizing the lead layer 4 or the metal tube 2, or one or more types of adhesive that strengthens the fixation between the lead layer 4 and the metal tube 2. Sometimes a combination is involved. The composite pipe 1 as described above is manufactured by the following method.
Manufactured. First, a corrugated metal tube 2 is formed. For example, Figure 5a,
As shown in b and c, the thickness is 0. 3-2. A flat metal plate 7 of about 0 ms is rolled into a tubular shape and the joint 8 is TIG, M
Welding is performed by tG, plasma arc, resistance welding, laser welding, electron beam welding, etc., and then corrugated processing is performed to form the corrugated metal tube 2. Next, the corrugated metal tube 2
For example, a lead pipe 3 extruded using a continuous lead extruder is inserted into the tube. This insertion of the lead pipe 3 is performed, for example, at the sixth
As shown in the figure, when forming the corrugated metal tube 2 from the metal strip 7, the metal flat plate 7 is rolled up in advance and the lead tube 3 is inserted. At this time, it is preferable to insert a heat shield plate or a cooling pipe S between the metal pipe 2 and the lead pipe 3 so that the inserted lead pipe 3 is not melted by the heat of welding the seam 8 of the metal flat 7. Another method for inserting the lead pipe 3 is a method that is adopted when the composite pipe is not very long, in which the lead pipe 3 and the corrugated metal pipe 2 having an inner diameter slightly larger than its outer diameter are manufactured in advance. Then, insert the lead pipe 3 into the corrugated metal pipe 2 from its end. After that, both ends of the lead pipe 3 are sealed, a pressure medium such as gas or liquid is sealed inside the lead pipe 3, and the lead pipe 3 is connected to the corrugated metal pipe 3.
At the same time, by evacuating the atmosphere in the gap 10 formed between the lead pipe 3 and the inner peripheral surface of the corrugated metal pipe 2, the diameter of the lead pipe 3 is expanded and the corrugated metal pipe 2 is processed. A lead layer 4 is formed by bringing a lead pipe 3 into close contact with the inner peripheral surface of the lead pipe 3. At this time, it is preferable to heat the lead pipe 3 to a maximum of 150'C or less to facilitate pipe expansion. The reason why the heating temperature is set to a maximum of 150° C. or lower is that heating to a temperature higher than this may cause the strength of the lead pipe 3 to deteriorate, and locally weak parts may be damaged by internal pressure. Next, the internal pressure for expanding the diameter of the lead pipe 3 depends on the inner diameter of the lead pipe, but is at most about 50 kg/cd, preferably 10 kg/cd.
cd or less to prevent deformation even if the corrugated metal tube 2 has a large diameter. In addition, with regard to the pressurization method, if the maximum internal pressure is applied all at once, if there is a localized weak point in the lead pipe 3 due to unevenness, there is a risk of damage to that part. /d for 1 hour, then tokg/cd for 1 hour, then 15kg/d for 1 hour.
It is preferable to increase the pressure gradually over time to the maximum pressure allowed by the design. When the composite pipe 1 is short, the corrugated metal pipe 2 and the lead pipe 3 may be formed separately, and the lead pipe 3 may be inserted into the corrugated metal pipe 2 later. As mentioned above. The diameter of the lead pipe 3 may be expanded by filling the lead pipe 3 with a pressure medium after the lead pipe 3 is inserted into the corrugated metal pipe 2 and is transported to the required location and installed. ．． Furthermore, the corrugated metal pipe 2 has flexibility due to the corrugation, but this shape also occurs in the lead pipe 3 that is tightly fitted inside, so the corrugation of the inner surface of the lead pipe 3 increases the fluid resistance inside the pipe. In some cases, this may be undesirable. If fluid resistance due to corrugation becomes a problem, the pressure of the pressure rod enclosed in the lead pipe 3 should be adjusted to approximately 60 to 10% of the theoretical rupture tensile strength of the composite pipe before corrugation.
Further increase the pressure to 0% and hold for a certain period of time, e.g.
It is best to leave it for ~60 minutes to stretch out the waves in the corrugated metal tube 2.

Next, when transferring the composite pipe 1 to a heat pipe, if a wick is not required, just seal both ends, and if a wick is required, just cover the lead pipe 3 with wick material 11 and seal in the working fluid. ．． To create a wink inside the lead pipe 3, the following procedure may be used.

That is, when carbon fiber, metal mesh, etc. are used as the wink material 11 and fixed to the inner surface of the lead pipe 3, stainless steel is used to maintain the shape of the wick material 11, as shown in FIG. , copper, nylon, FR
Form a spiral 12 with P etc., and this spiral 12
Wrap the wick material 11 around the outer circumference of the wick material 1.
1 is fixed to the spiral 12 with a binder material (cloth tape, metal tape, wire, etc.) 13 as necessary.

Next, the wink material 1 fixed to this spiral 12
As shown in FIG. 8, 1 is supplied to a continuous lead extruder [14] capable of wrapping a long object therein, and lead is continuously coated around the wick material 11 to form a lead pipe 3. ．． The lead pipe 3 thus formed may be cut to a certain size or wound around a drum, if necessary. Next, this lead pipe 3 is inserted into the corrugated metal tube 2, and then the diameter is expanded to bring it into close contact with the inner surface of the corrugated metal tube 2. In addition, in the case of long heat pipes, if the required length is known, it can be sealed and filled with hydraulic fluid at the factory, but if the required length is not limited, it can be wrapped in a drum. After installing a composite pipe 1 with a wick material 11 stretched on the inner surface of the composite pipe 1, the air inside the composite pipe 1 is evacuated from both ends or one end of the composite pipe 1, and then the required amount of hydraulic fluid is filled in. Then, by sealing both ends, a heat pipe is obtained. When a heat pipe is manufactured in this manner, it can be well adapted to various conditions at the site where it is installed, so a more practical heat pipe can be obtained despite the installation method. For example, when this heat pipe is provided with a heat insulating layer and a protective cover in the center to form a heat insulating part 15 as shown in FIG. 9, and a heat absorbing part 16 and a heat radiating part 17 are formed on both sides of this heat insulating part 15. In this case, when parts A and B surrounding the heat absorbing part 16 and the heat radiating part 17 are both air, the heat retaining layer and the protective layer are removed from both the heat absorbing part 16 and the heat radiating part 17, and the corrugated metal tube 2 is left as is. Just attach the fin 18 to that part. If part A is steam or high-temperature water and part B is air, it is preferable for corrosion resistance to cover at least the corrugated metal tube 2 in part A with a lead pipe on the outside. However, covering the entire length with lead pipes
It is not necessarily necessary, and it is sufficient if the metal surface of the heat absorbing portion 16 that contacts the A portion is covered to a minimum extent. Of course, in this case, instead of using a lead pipe to cover the corrugated metal tube 2 in section A, the corrugated metal tube may be corroded with a thin corrosion-resistant material such as Teflon, although the heat exchange rate will be lower. Regarding section B, if it is necessary to impart corrosion resistance to the corrugated metal tube 2, the same treatment as for section A described above may be taken. Of course, the material of the corrugated metal tube is stainless steel, etc.
It goes without saying that if the surrounding conditions are not corrosive, there is no need to coat the pipe with lead, even if the surrounding area is a liquid atmosphere, and the metal pipe can be used as is. [Effects of the Invention] Since the container is a composite pipe having a lead pipe made by expanding the diameter of a lead pipe and tightly adhering it to the inner surface of a corrugated metal pipe, the hydraulic fluid is not limited, and the pipe is not limited to conventional pipes. It has the advantage that water, methanol, etc., which cannot be used with aluminum pipes, can be used.

Furthermore, since the container is flexible, it is easy to construct the facility. Furthermore, since the corrugated metal pipe that covers the outer periphery of the lead pipe has internal pressure resistance characteristics, it is possible to obtain a heat pipe that can be used up to pressure and temperature ranges that cannot be used with lead pipes alone.

[Brief explanation of drawings]

1 to 3 are cross-sectional views showing an embodiment of a composite pipe used in a heat pipe container according to the present invention, FIG. 4 is a cross-sectional view showing a state in which a lead pipe is inserted into a corrugated metal pipe, and FIG. Figures 5 (a), (b), and (c) are diagrams showing an example of a method for manufacturing a corrugated metal pipe, Part 6 is a schematic diagram showing a state in which a lead pipe is inserted into a corrugated metal pipe, and Figures 7 and 8 are The figure is a schematic diagram showing a process of installing a wick material into a lead pipe, and FIG. 9 is a schematic diagram showing an embodiment of a heat vibrator according to the present invention. 1... Composite pipe, 2... Corrugated metal pipe, 3... Lead pipe, 5, 6... Protective layer, 11... Wick material, 4...Lead layer, 7...Metal plate, 12...Sviral.

Claims (2)

[Claims] (1) A heat pipe in which a container is a composite pipe having a lead layer formed by expanding the diameter of a lead pipe and tightly adhering it to the inner surface of a corrugated metal pipe, and a working fluid is sealed in the container. (2) The heat pipe according to claim 1, wherein the working fluid is water or methanol.