JPS60243486A - Antifreezing heat pipe for water service pipe - Google Patents

Abstract

PURPOSE:To enable the titled heat pipe to be efficiently fitted to a water service pipe without inserting it into the water service pipe, by a construction wherein the shape of a part of a heat-releasing part of the heat pipe can be varied, and fins having highly heat-conductive fastening bands for fixing to a water service pipe are provided at intervals at a part of the heat pipe faced to the water service pipe. CONSTITUTION:The heat pipe 11 comprises a heat-receiving part 12 reaching a terrestrial heat part 5, a heat-insulated part 13 surrounded by a heat insulator 4, and the heat-releasing part 14 for releasing the heat taken in by the part 12. A straight pipe part 14a of the part 14 is fitted with fins 15... on its outer surface on the water service pipe side, at predetermined intervals in the longitudinal direction. The highly heat-conductive fastening bands 17 for fixing the fins 15 to a riser pipe 2a and transmitting heat to the water service pipe are fitted. The heat released from the part 14 is transmitted to the riser pipe 2a through the fins 15 and the bands 17. Since the part 13 is thermally insulated by covering it by the heat insulator 19, the released heat is effectively transmitted to the riser pipe 2a.

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to a heat pipe for preventing freezing of water pipes on the surface of the earth in cold regions, particularly bent portions of water pipes. Traditionally, when carrying out water piping work in cold regions,
As shown in Figure 3, the water pipe 2 is laid in the unfrozen layer deeper than the frozen layer 1 on the ground surface, and when it is set up and bent from the + side as it is, or when it is brought indoors etc. and connected to the faucet. In order to prevent the riser pipe 2a from falling into the frozen layer 1 or the ground and being exposed to low temperatures and freezing, the heat dissipating part 3c of the heat pipe 3 is inserted into the riser pipe 2a.

A method is adopted in which the heat receiving section 3a of the heat pipe is positioned in the geothermal section 5 via a heat insulating section 3b covered with a heat insulating material 4, with the heat pipe being partially double-pipe. Although this method has good thermal efficiency in preventing freezing, if the water pipe has a bend, it becomes very difficult to construct a double pipe by inserting a heat pipe. Furthermore, in this double pipe system, if damage such as cracking of the heat dissipating section 3CK occurs, there is a possibility f'L that the working fluid will be mixed into the tap water. Object and Structure of the Present Invention In view of the above circumstances, an object of the present invention is to provide a heat pipe that is suitable for heating particularly bent portions of water pipes and that can be efficiently attached to water pipes without being inserted into the water pipes. The gist is that the heat pipe heats the water pipe by providing a heat dissipating section at least at the bending section of the water pipe, at least a part of the heat dissipating section having a bendable variable shape, and the variable shape section A heat pipe for preventing freezing of water pipes, in which fins having thermally conductive tightening bands for fixing to the water pipes are provided at intervals in the length direction on the part of the outer peripheral surface facing the water pipes. be. Specific Structure of the Present Invention FIGS. 1 and 2 show an embodiment of the heat pipe according to the present invention. FIG. 1 is a side view showing a structure in which a heat pipe 11 is attached to a riser pipe 2a; ! FIG. 2 is a cross-sectional view thereof. 2. The heat receiving part reaches the geothermal part 5. It is composed of a heat insulating part 13, a heat receiving part 12 which takes in heat, and a heat radiating part 14 which releases heat. The heat dissipation section 14 has a straight pipe section 14a following the heat insulating section and a bellows section 14h at the tip. Fins 15 are attached to the outer surface of the straight pipe section 1.4a of the heat dissipation section 14 on the water pipe side at predetermined intervals in the length direction, and fins 15 are attached to the bellows section 14b with suitably selected friends. Fins 15 are attached to the outer surface of the convex portion 16 on the water pipe side. A fastening band 17 with good thermal conductivity is attached to fix these fins 15 to the rising g2a and to transfer heat to the water pipe. These tightening bands 17 have a separating section 1.
7a is provided, and is designed to produce a thermal effect that tightens the bolts and nuts 17b to bring the tightening band 17 into close contact with the water pipe. In the heat pipe according to the present invention, a flexible material is used because the heat radiation part has a variable shape. -However, there is no need to repeatedly deform it, and it is only necessary to bend it once or twice to match the external shape of the water pipe, so high toughness is not necessarily required. Therefore, commonly used copper, aluminum, stainless steel, aluminum alloy, etc. can be used as they are. Finally, the fins and tightening bands are particularly required to have good geothermal conductivity and strength for fixing between water pipes and heat pipes, and copper, aluminum, etc. are suitable. Note that these may also be laminates with two layers of reinforcing material on the back side of the heat transfer surface. In addition, although a bellows shape is shown as an example of a bendable deformable shape for the heat dissipation part, the present invention is not limited to this bellows shape, and a convoluted shape, a flat shape, a shape with a large number of small diameters, etc. are also suitable. used. Effects of the present invention Since the heat pipe 11 according to the present invention has the above-described structure, even if the riser pipe 2a is bent, the heat dissipation portion 14 of the heat pipes arranged in parallel can be bent freely. Utilize the variable shape to create the tightening band 15-... and start up Q! F2
・L (Fixed as close as possible to f'L.Furthermore, the heat pipe 11 does not need to be manufactured in a factory to match the riser pipe 2a, and can be seen at the site by 2+: In addition, the heat radiated by the heat radiating section 14 is transmitted through the fins 15 and the tightening band 17.
It is transmitted to the tube 2a. At this time, the above-mentioned parts (heat pipe heat dissipation section 14, fins 15, tightening band) 7 and riser p-pipe 211 are coated and insulated with heat insulating material] 9. The heat emitted by the FAffi 14 is effectively transferred to the riser pipe 2a, and the water in the pipe does not freeze even in extremely cold regions. Once installed, the heat dissipation part will not be subject to repeated bending and stretching, and material fatigue failure of the variable shape parts such as bellows will not occur. In the above description, since the water pipe to be attached is the riser pipe 2a, the bellows portion 14t+ is only in the vicinity of the tip of the heat radiating part 14, but the whole heat radiating part 14 is made into a bellows shape so that it can be widely adapted to the water pipe to be attached. In some cases, the straight pipe portion 14a may be provided in the middle of a plurality of bellows portions.
Ha. Further, although the fins 15 of the bellows portion 14h are provided on the convex portion 16, they may also be provided on the concave portion 20 or the concave and convex portions 16, 2Q as appropriate. As described above, the heat pipe for preventing freezing of water pipes according to the present invention has extremely high on-site adaptability to the shape of water pipes, and can be easily installed even in water pipes that are not straight. has.

[Brief explanation of the drawing]

1st south is a side view illustrating a method for preventing freezing of a rising water pipe using a heat pipe according to the present invention; 2... water pipe; 2a... rising water pipe; ,3
...Heat vibe, 3a, old...Heat receiving part, 3b
...Insulation section, 3c...Straight pipe section, 14b
・・Group・Fin, 15・・Group・Fin, 17・・・・
- Locking band, 19... Insulation material. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A heat pipe that heats the water pipe by providing a heat radiation part at least at the bending part of the water pipe, wherein at least a part of the heat radiation part has a bendable variable shape, and a part of the outer peripheral surface of the variable shape part is attached to the water pipe. A heat pipe for preventing freezing of water pipes, the facing portion of which is provided with fins having thermally conductive tightening bands for fixing to the water pipe at intervals in the length direction.