JPH10141878A - Manufacture of heat pipe on site - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure that the production can be made in a factory, that the transportation with a track is easy, that the work on installation site is also simple, and that this can exhibit the performance enough. SOLUTION: An upper heat pipe 1a where a ferromagnetic edge 9 is inserted into an evacuated metallic pipe 7 and a magnet to attract the ferromagnetic edge 9 is attached to the periphery of the tip of the metallic pipe 7, and a lower heat pipe 1b where a refrigerant 14 is charged in the evacuated metallic tube 7 connected to this bottom are arranged two pieces lengthwise and are joined with each other, being sealed with a nut-shaped connecting metal fitting 15, on a installation field. Then, the magnet attached to the upper short heat pipe 1a is removed, and the ferromagnetic edge 9 is allowed to fall. Then, the block plates 11b and 11b at the junction part are punched by an impact, whereby the inside of both heat pipes 1a and 1b are made continuous to make one piece of heat pipe 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a long heat pipe for transferring heat from a high-temperature underground heat source to a low-temperature surface.

[0002]

2. Description of the Related Art In order to prevent snow on a road surface or a parking lot or snow on a roof, or to prevent freezing of house facilities and the like, heating is performed using geothermal heat. In this way, as a device that uses the geothermal heat to prevent snow melting and freezing, a refrigerant is sealed inside a metal tube that has been decompressed,
A heat pipe having a rapid heat transfer function is used, with the lower part of the metal tube serving as a refrigerant evaporating part and the upper part serving as a refrigerant vapor condensing part. This heat pipe is buried in the ground, absorbs high-temperature geothermal heat from the deeply buried evaporating section, and transfers heat to the condensing section buried near the low-temperature surface to heat.

In order to effectively extract geothermal heat using this heat pipe, it is necessary to increase the length to several tens of meters. Although such a long heat pipe can be produced in a factory, it cannot be transported as it is long since a large truck carrying the heat pipe to the installation site is about 9 m. For this reason, multiple pipes of a length that can be transported by a large truck are transported to the installation site, where they are welded to lengthen the pipes, a leak test is performed, and the long pipes are heated (baked) on site ) While the inside of the pipe is evacuated, a refrigerant is finally sealed and the end is cut off to create a heat pipe.

[0004] The heat pipe 1 thus welded on site
As shown in FIG. 4, is buried in the underground 2 using a driving machine, absorbs high-temperature geothermal heat from the deeply buried evaporating section 3, and transfers heat to the condensing section 4 buried near the low-temperature ground surface. It is moved to melt snow on the road surface 5.

[0005] However, work conditions such as on-site welding work, evacuation, charging of refrigerant, and leak test of the welded portion 6 are inferior to those of a factory. There was a problem that could not be demonstrated.

[0006]

SUMMARY OF THE INVENTION The present invention eliminates the above-mentioned disadvantages, can be manufactured in a factory, is easy to transport by truck,
An object of the present invention is to provide a method for manufacturing a heat pipe on site, in which the work at the installation site is easy and the performance can be sufficiently exhibited.

[0007]

According to a first aspect of the present invention, there is provided a method for manufacturing a heat pipe in a field, wherein a ferromagnetic blade is inserted into a metal tube having a reduced pressure, and the ferromagnetic blade is mounted on the outer periphery of the tip of the metal tube. A short heat pipe at the uppermost portion to which a magnet to be attached is attached, and a short heat pipe at the lower side in which a refrigerant is sealed inside a decompressed metal tube connected to the lower portion are manufactured in advance at a factory. After arranging these multiple short heat pipes vertically at the installation site, sealing the joints with connecting fittings and joining, remove the magnet attached to the top short heat pipe and drop the ferromagnetic blade In addition, the impact plate breaks the closing plate at the joint, and connects the inside of the heat pipe to produce one long heat pipe.

According to a second aspect of the present invention, there is provided a method of manufacturing a heat pipe in a field, wherein a thread is formed on an outer periphery of a joint portion of the short heat pipe, and adjacent short heat pipes are integrally joined by a nut-like fitting. And the on-site joining work is easy.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIG.
This will be described in detail with reference to FIG. As shown in FIG. 1A, a thread 8 is formed on the outer periphery of one end of a metal tube 7 such as a copper tube or a stainless steel tube having a length of about 6 to 8 m. Next, a ferromagnetic blade 9 is inserted into the metal tube 7, one end of which is closed with a closing plate 11 a formed of a thick plate provided with a nozzle 10, and the other end side on which the thread 8 is formed is about 0.8 mm. It is closed by a closing plate 11b formed of a thin plate. A ring-shaped magnet is provided around the outer periphery of the end of the metal tube 7 where the ferromagnetic blade 9 is inserted.
Attach 12 to adsorb the ferromagnetic blade 9. Thereafter, the inside is evacuated from the nozzle 10 while heating (baking) the metal tube 7, and then the nozzle 10 is sealed off to form the upper short heat pipe 1a.

In the lower short heat pipe 1b, similarly, a thread 8 is formed on the outer periphery of one end of a metal tube 7 having a length of about 6 to 8 m, and an end of this portion is formed by a thin plate. A stopper 13 having a funnel-shaped central portion of the metal block is joined to the other end of the metal tube 7 with a stopper 11a formed of a thick plate provided with a nozzle 10. Close. Thereafter, the interior of the metal tube 7 is evacuated while heating, and the refrigerant 14 is sealed from the nozzle 10.
10 is sealed to form the lower short heat pipe 1b. In this way, the upper and lower short heat pipes 1a and 1b are prepared in a factory, and then transported by truck to the installation site.

At the installation site, as shown in FIG. 1 (B), the upper short heat pipe 1a and the lower short heat pipe 1b are vertically arranged with the closing plates 11b, 11b formed of thin plates facing each other. After that, the nut-shaped connection fitting 15 is attached to the threads 8, 8 and joined in a sealed state. Next, when the ring-shaped magnet 12 attached to the outer periphery of the upper end of the short heat pipe 1a is removed, as shown in FIG. 2 (A), the ferromagnetic blade 9 which has been adsorbed falls by its own weight. B) Closed plate 11 formed of a thin plate as shown in B)
b, 11b and breaks through it, collides with a stopper 13 attached to the bottom surface of the lower short heat pipe 1b, and stops. As a result, the two short heat pipes 1a and 1b communicate with each other to form one heat pipe 1.

After one heat pipe 1 is prepared on site, the heat pipes 1 are sequentially driven by a driving machine and buried in the ground 2 as shown in FIG. Attach radial radiating fins 16 and backfill. The heat pipe 1 has a lower portion buried deep in the ground 2 as an evaporator 3 and a radiator fin 16 mounted on the road surface 5 as a condenser 4 as an upper end, and heat is rapidly transferred between them. The snow is melted on the road surface 5 by the geothermal energy.

In the above description, two short heat pipes 1a and 1b are joined, but three or more short heat pipes may be connected. In this case, it is necessary to close the short heat pipe disposed in the middle with a closing plate formed of a thin plate at both ends. The refrigerant 14 may be sealed in any one of the plurality of short heat pipes, but the refrigerant 14 may be sealed in all the short heat pipes.

In the above description, a case has been described in which a thread is formed on the outer periphery of the joint portion of the short heat pipe, and the thread is formed integrally with the nut-like connection fitting 15 here. It is also possible to adopt a method of fitting and then welding and joining them together. Further, if the upper part of the ferromagnetic blade 9 is made porous, the function of a boiling stone can be achieved in a state of being immersed in the refrigerant 14, and the evaporation of the refrigerant 14 in the evaporator 3 can be promoted.

[0015]

As described above, according to the heat pipe manufacturing method of the present invention, a plurality of short heat pipes shorter than the length of the truck bed are manufactured in advance in a factory.
After installing and connecting this vertically at the installation site, the closing plate is punched out with a ferromagnetic blade and the inside is communicated to create one long heat pipe at the site, improving workability and In addition, the heat transfer performance can be sufficiently exhibited.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view showing two short heat pipes produced in a factory according to an embodiment of the present invention.
(B) is a cross-sectional view showing a state in which two short heat pipes are joined with a connection fitting.

FIG. 2A is a cross-sectional view showing a state where a ferromagnetic blade is falling. (B) is a cross-sectional view of the heat pipe showing a state in which the ferromagnetic blade punches out the closing plate and the inside communicates.

FIG. 3 is a cross-sectional view showing a state where a heat pipe created on site is buried underground.

FIG. 4 is a cross-sectional view showing a state in which a heat pipe prepared on site by a conventional method is buried underground.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Heat pipe 1a Short heat pipe 1b Short heat pipe 2 Underground 3 Evaporating part 5 Condensing part 5 Road surface 6 Welding part 7 Metal pipe 8 Thread 9 Ferromagnetic blade 10 Nozzle 11a Closing plate 11b Closing plate 12 Magnet 13 Stopper 14 Refrigerant 15 Connection bracket 16 Radiation fin

Claims (2)

[Claims] 1. An uppermost short heat pipe in which a ferromagnetic blade is inserted into a metal tube whose pressure has been reduced, and a magnet for adsorbing the ferromagnetic blade is attached to an outer periphery of a tip of the metal tube, and is connected to a lower portion thereof. At the installation site, a plurality of short heat pipes on the lower side in which a refrigerant was sealed inside the decompressed metal pipe, and a plurality of the heat pipes were vertically arranged, sealed and joined with a fitting, and then attached to the uppermost short heat pipe. A method for manufacturing a heat pipe in a field, comprising removing a magnet, dropping a ferromagnetic blade, breaking an obstruction plate at a joint portion by an impact thereof, and connecting the insides of the heat pipes. 2. The heat pipe site according to claim 1, wherein a thread is formed on an outer periphery of a joint portion of the short heat pipe, and adjacent short heat pipes are integrally joined by a nut-like fitting. Production method.