JPH0379636B2 - - Google Patents

Description

Detailed Description of the Invention: Industrial Application Field This invention transports heat as the latent heat of vaporization of the working fluid by evaporating and liquefying a condensable working fluid sealed inside a sealed tube and circulating it in the vertical direction. This relates to a thermosyphon that performs.

BACKGROUND TECHNOLOGY A thermosiphon basically consists of evacuating a non-condensable gas such as air from the inside of a sealed tube and then sealing in a condensable fluid such as water as a working fluid.
The working fluid is evaporated by applying heat to the lower end of the sealed tube, which is installed almost vertically.
At the same time, by removing heat from the upper end of the sealed tube,
The working fluid vapor is condensed and liquefied at the upper end of the closed tube,
Furthermore, the liquefied working fluid is caused to flow down along the inner surface of the sealed tube, and as a result, heat is transferred as latent heat of vaporization of the working fluid. Therefore, thermosiphons are simple in construction and can transport heat without requiring external power, making it possible to collect geothermal heat or extract heat from underground to store cold heat underground. It can be considered to be used for such purposes.

However, in the general thermosiphon described above, the working fluid is configured to flow down the inner surface of a sealed tube, so the condensed and liquefied working fluid is distributed over the entire inner circumferential surface of the evaporator where heat is input from the outside. It is not always possible to sufficiently disperse the working fluid, and the flow direction of the working fluid and the working fluid vapor are opposite, resulting in opposing flows. There is a problem in that the heat is scattered by the steam flow, resulting in a shortage of working fluid in the evaporator, which limits the amount of heat transport. A thermosiphon having the configuration shown in FIG. 5 has been proposed as a thermosiphon capable of solving such problems.
This has a heat dissipation/liquid reservoir part 3 with fins 2 attached to the upper end of the sealed tube 1, and a distribution pipe 4 with many small holes formed in the peripheral wall at the bottom of the heat dissipation/liquid reservoir part 3. At the same time, the lower end side of the distribution pipe 4 is drawn in from the outside of the sealed tube 1 to the inside through the peripheral wall, and non-condensable gas such as air is evacuated from the inside of the sealed tube 1. In this state, a condensable fluid such as water is sealed as a working fluid. A thermosyphon with such a configuration applies heat Q to the lower end of the sealed tube 1 that is vertically erected with the heat dissipation/liquid reservoir section 3 on the upper side, and removes heat Q from the heat dissipation/liquid reservoir section 3. For example, the working fluid vapor flows upward inside the sealed tube 1 to the heat dissipation/liquid reservoir section 3.
The resulting working fluid flows down through the distribution pipe 4 and is distributed and supplied to the entire inner circumferential surface of the sealed pipe 1.

Problems to be Solved by the Invention However, in the conventional thermosiphon shown in FIG. Therefore, it is difficult to uniformly disperse the working fluid over the entire inner peripheral surface of the sealed tube 1.
Further, there were manufacturing problems such as difficulty in drawing the small-diameter distribution pipe 4 into the interior of the sealed pipe 1 and fixing it at a desired position.

This invention has been made in view of the above circumstances, and an object thereof is to provide a vertical thermosiphon that is easy to manufacture and has an excellent heat transport amount.

Means for Solving the Problems In order to achieve the above object, the present invention provides an opening at least at the upper end with a smaller diameter and shorter length than the outer tube, and which is provided inside an outer tube of a closed structure arranged vertically. A helical filament is sandwiched between the inner circumferential surface of the outer tube and the outer circumferential surface of the inner tube, and a substantially condensable material is inserted into the outer tube. The inner tube is characterized in that only a working fluid is sealed therein, and a large number of ventilation holes are formed in the peripheral wall of the inner tube.

Further, in the present invention, it is preferable that a cut-and-raised piece is formed on the inner tube and connected at the upper end, and the cut-and-raised piece is bent to the outside of the inner tube to form the ventilation hole.

Further, in the present invention, when at least the inner tube is a spiral corrugated tube, it is preferable that the vent hole is formed in a portion of the peripheral wall of the inner tube where the outer surface faces obliquely downward.

Function: Also in the thermosiphon of the present invention, the working fluid evaporates and flows toward the upper end, and then radiates heat and liquefies, thereby transporting heat as the latent heat of evaporation of the working fluid. In this case, in this invention, since the spiral filament is sandwiched between the inner tube and the outer tube, a spiral liquid reservoir is formed between the inner tube and the outer tube, and the liquid reservoir is activated here. Evaporation of the fluid occurs and the vapor flows upward between the inner and outer tubes, but since the space between the inner and outer tubes is spiral-shaped,
The working fluid vapor gradually flows into the inside of the inner tube through the vent hole, and substantially the interior of the inner tube becomes a vapor flow path through which the working fluid vapor reaches the upper end. In addition, since the inner tube is shorter than the outer tube, the working fluid vapor flowing to the upper end contacts the inner circumferential surface of the outer tube and releases heat to the outside, and the resulting liquid phase working fluid is transferred to the outer tube. The liquid flows down along the inner peripheral surface, and thus the spiral space between the inner tube and the outer tube becomes a liquid flow path, and gas-liquid separation is performed. Furthermore, since the working fluid flows down in a spiral flow, it is sufficiently distributed and supplied over the entire inner circumferential surface of the outer tube, where heat exchange takes place.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing one embodiment of the present invention, in which an inner tube 11 is inserted concentrically into an outer tube 10, and a spiral shape is formed between the outer tube 10 and the inner tube 11. The entire container is formed by sandwiching the filamentary bodies 12 of the container. Here, the outer tube 10 is made of a spiral corrugated tube of a sealed structure with spiral irregularities on the peripheral wall, and is used vertically, and its upper end is formed into a straight tube shape and has fins 13. It is attached as a heat dissipation part 14, and most of the lower end part is an evaporation part 15 which receives heat from the outside.
Further, a heat insulating part 16 is formed between the evaporation part 15 and the heat radiation part 14. On the other hand, the inner tube 11 is made of a spiral corrugated tube having a smaller diameter and shorter dimensions than the outer tube 10 and the same pitch as the outer tube 10, and the upper end of the inner tube 11 is connected to the heat dissipation section 14. It is arranged concentrically inside the outer tube 10 so as to be located on the lower side. The filamentous body 12 is sandwiched between the inner surface of the outer tube 10 and the outer surface of the inner tube 11 while being in contact with them. Note that the striatum 12 has an outer tube 10 and an inner tube 11.
The inner tube 11 may be fixed to either one of the outer tubes 10 by welding or the like, and in such a case, the inner tube 11 may be screwed into the outer tube 10 using the filament 12 as a thread. .

Further, a ventilation hole 17 of any shape such as a round shape is formed in a portion of the inner tube 11 that does not come into contact with the filamentary body 12 and whose outer surface faces obliquely downward.
The ventilation hole 17 may be formed by simply punching out a part of the inner tube 11, but as shown in FIG. It is preferable to form a piece 18 and bend the cut and raised piece 18 to the outside of the inner tube 11.

Inside the outer tube 10 configured as described above, a condensable working fluid 19, such as water, that evaporates at the intended use temperature is sealed after a non-condensable gas such as air is evacuated.

In the thermosiphon configured as described above, heat Q is applied from the outside to the evaporation section 15, and the heat dissipation section 1
When heat Q is taken away from 4, the working fluid 19 evaporates in the evaporator, and the vapor is transferred to the heat radiator 1 with low pressure.
It flows upward towards 4. In that case, the working fluid vapor is generated between the inner tube 11 and the outer tube 10 and becomes an upward flow, but since the striated body 12 is sandwiched between the inner tube 11 and the outer tube 10, a spiral flow occurs between the inner tube 11 and the outer tube 10. Since the working fluid vapor enters the inside of the inner tube 11 through the vent hole 17 formed in the inner tube 11 and flows there toward the heat radiating section 14 . In particular, if the ventilation hole 17 is configured with a cut-and-raised piece 18 left as shown in FIG. 2, the cut-and-raised piece 18 serves as a guide, and the working fluid vapor quickly enters the inside of the inner tube 11. Since the inner tube 11 is shorter than the outer tube 10 as described above, the working fluid vapor flows through the outer tube 10 in the heat dissipation section 14.
It comes into contact with the inner circumferential surface of the tube, where it radiates heat and condenses into liquid. The resulting liquid-phase working fluid flows down along the inner surface of the outer tube 10, so it enters between the inner tube 11 and the outer tube 10 at a portion below the heat dissipation section 14.
Since a spiral space is formed between the inner tube 11 and the outer tube 10 by sandwiching the filament 12, the hydraulic fluid flows outside the inner tube 11 in a spiral flow.

Therefore, in the above thermosiphon, the inner tube 1
1 becomes a steam flow path and the outside of the inner tube 11 becomes a working fluid flow path, so that gas-liquid separation is performed and the working fluid is not scattered by the steam flow.
In other words, there are almost no restrictions due to the scattering limit,
In addition, since the working fluid forms a spiral flow, it is dispersed over the entire inner circumferential surface of the outer tube 10, and as a result, a sufficient amount of working fluid can be supplied to the entire inner circumferential surface of the evaporator section 15 where heat is input. .

Note that the outer tube and inner tube in this invention are not limited to spiral corrugated tubes, and may be formed of straight tubes. Examples are shown in FIGS. 3 and 4. As shown in these figures, an outer tube 20 is formed of a straight tube with a sealed structure, and a straight inner tube 21 having a smaller diameter and shorter length than the outer tube 20 is inserted concentrically therein. A spiral filament 22 is sandwiched and fixed between the outer tube 20 and the inner tube 21. Further, a fin 23 is attached to a portion of the outer tube 20 above the inner tube 21 to form a heat radiating section 24 . On the other hand, most of the lower side of the outer tube 20 serves as an evaporator section 25, and a small portion between the evaporator section 25 and the heat radiation section 24 serves as a heat insulating section 26.

On the other hand, as shown in FIG.
is formed. The ventilation hole 27 may be formed by simply punching it out as in the previous embodiment, or it may be formed as a through hole having a cut-and-raised piece connected at its upper end.

The outer tube 20 and inner tube 21 constitute the entire container, and only substantially condensable working fluid 29 is sealed inside the container.

Note that if the inner diameter D of the inner tube 21 is approximately 25φ, the diameter d of the vent hole 23 is 1φ≦D≦8φ.
It is preferable to set it to a certain degree.

Even if the outer tube 20 and the inner tube 21 are formed of straight tubes as shown in FIG. It serves as a reflux section for the working fluid, and also serves as the inner pipe 2
Since the inside of 1 serves as a flow path for the working fluid vapor and the two are isolated, the working fluid can be sufficiently distributed and supplied to the entire evaporation section 25.

Effects of the Invention As explained above, according to the present invention, there is no restriction on the amount of heat transport due to the so-called scattering limit, and
Since the working fluid can be sufficiently distributed and supplied to the entire heat input area, the amount of heat transport can be increased more than ever before, and the amount of heat transported can be increased several times compared to a general thermosiphon. did it. Further, in the present invention, since the inner tube having a perforated structure can be inserted and fixed into the outer tube, the manufacturing workability can be improved.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention, Fig. 2 is a partial view thereof, Fig. 3 is a sectional view showing another embodiment of the invention, and Fig. 4 is a front view showing the inner tube thereof. , FIG. 5 is a schematic diagram showing an example of a conventional thermosiphon. 10,20...Outer tube, 11,21...Inner tube, 1
2, 22...Striatum, 14, 24...Heat radiation part, 1
5, 25... Evaporation section, 17, 27... Ventilation hole, 1
8... cut and raised piece, 19, 29... working fluid.

Claims (1)

[Scope of Claims] 1. An inner tube having a smaller diameter and shorter length than the outer tube and having at least an open upper end is concentrically inserted into an outer tube of a closed structure arranged vertically, and the outer tube A spiral filament is sandwiched between the inner circumferential surface of the inner tube and the outer circumferential surface of the inner tube, and substantially only condensable working fluid is sealed inside the outer tube, and a A gas-liquid separation type vertical thermosiphon characterized by the formation of numerous ventilation holes. 2. The ventilation hole is formed by cutting a part of the inner tube to form a cut and raised piece connected at the upper end, and bending the cut and raised piece toward the outer circumference of the inner tube. A gas-liquid separation type vertical thermosiphon according to claim 1. 3. At least the inner tube of the outer tube and the inner tube is formed of a spiral corrugated tube, and the ventilation hole is formed in a portion of the peripheral wall of the inner tube with the outer surface facing diagonally downward. A gas-liquid separation type vertical thermosiphon according to claim 1 or 2, characterized in that: