JPS6329193A - Gas liquid separation type vertical thermo siphon - Google Patents

Abstract

PURPOSE:To provide a superior work efficiency and a superior thermal transportation amount by a method wherein an inner pipe having an opened upper end and having several air holes at its circumferential wall is concentrically inserted and arranged within an external pipe having a closed structure and a helical line is held between both pipes. CONSTITUTION:A heat Q is applied to an evaporater part 15 from an external source and the heat Q is retrieved from a radiation part 14, a working fluid 19 is evaporated and gasified at an evaporation part and its steam flows upwardly toward a radiation part 14 having a low pressure. In this case, the working fluid vapor is generated between the inner pipe 11 and the outer pipe 10 to generate an ascending flow. Since a helical line 12 is held between the pipes, a flowing resistance is high, resulting in that the working fluid vapor passes through air holes 17 formed in the inner pipe 11, enters the inner pie 11 and then flows toward the radiation part 14. In this way, the condensed and liquefied liquid phase working fluid in contact with an inner circumferential surface of the outer pipe 10 at the radiation part 14 flows down along the inner surface of the outer pipe 10, enters a space between the inner pipe 11 and the outer pipe 10, the working liquid becomes a helical flow due to a presence of the helical line 12 and flows out of the inner pipe 11. Therefore, the interior of the inner pipe 11 becomes a vapor passage and the outer part becomes a working fluid passage and thus a gas liquid separation is carried out.

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.

Conventional technology The thermosiphon basically consists of evacuating a non-condensable gas such as air from the inside of a sealed tube, then sealing in a condensable fluid such as water as the working fluid, and then running the sealed tube almost vertically. When installed, heat is applied to the lower end of the tube to evaporate the working fluid, and at the same time heat is removed from the upper end of the sealed tube, causing the working fluid vapor to condense and liquefy at the upper end of the sealed tube, resulting in a rough liquefaction. The working fluid is caused to flow down along the inner surface of the sealed tube, and as a result, heat is transported as the latent heat of vaporization of the working fluid. Therefore, thermosiphons are simple in construction and can transport heat without requiring external power, so they can be used to collect geothermal heat or store cold heat underground using afterheat from the ground. It can be considered to be used for

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 fully disperse the working fluid, and the flow direction of the working fluid and the working fluid vapor are opposite, resulting in counterflow, so the working fluid is not completely dispersed before it returns to the evaporation section where the heat is input. 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. While covering the connection, 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 roughly inside the sealed tube 1, a non-condensable gas such as air is evacuated. This is necessary in a configuration in which a condensed H fluid such as water is sealed as a working fluid in an evacuated state. With a thermosiphon having such a configuration, heat Q is applied to the lower end side of the sealed tube 1 which is vertically erected with the heat dissipation/liquid reservoir section 3 on the upper side.
When the heat Q is removed from the heat dissipation/liquid reservoir section 3, the working fluid vapor flows upward inside the sealed pipe 1 and condenses and liquefies in the heat dissipation/liquid reservoir section 3, and the resulting working fluid flows into the distribution pipe 4. It flows down through the interior and is distributed and supplied over the entire inner peripheral surface of the sealed tube 1.

Problems to be Solved by the Invention However, in the conventional thermosiphon shown in FIG. 5, the amount of hydraulic fluid ejected from each small hole in the distribution pipe 4 is greatly influenced by the head pressure based on the vertical position of the small hole. Therefore, it is difficult to uniformly disperse the working fluid over the entire inner circumferential surface of the sealed tube 1, and it is also difficult to draw the small-diameter distribution pipe 4 into the sealed tube 1 and fix it at the desired position. There were some manufacturing problems.

The present invention was made in view of the above circumstances, and it is an object of the present invention to provide a vertical fogging nermosyphon which is easy to manufacture and has an excellent heat transport amount.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides an opening at least at the upper end, which has a smaller diameter and shorter length than the outer tube, and 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.

Generally speaking, in this invention, when at least the inner tube is a spiral corrugated tube, it is preferable that the vent hole is formed at a location where the outer surface of the back of the peripheral wall of the inner tube faces diagonally 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 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, the working fluid vapor gradually flows into the vent hole. The working fluid vapor flows from the inside of the inner tube into the inner tube, and substantially the inside 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 pocket and the outer tube becomes a liquid flow path, and gas-liquid separation is performed. Since the working fluid roughly 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.

Example Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-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 is formed between the outer tube 10 and the inner tube 11. striatum 12
The container as a whole is formed by sandwiching the two. Here, the outer tube 10 is made of a spiral corrugated tube with a closed structure in which the unevenness of the peripheral wall is spiral, and is necessarily used vertically, and its upper end is formed into a straight tube shape and has fins 13. A heat dissipation section 14 is formed by attaching the evaporation section 15 to the heat dissipation section 14, and most of the lower end section serves as an evaporation section 15 into which heat is input from the outside, and a heat insulation section 16 is formed between the evaporation section 15 and the heat dissipation section 14. On the other hand, the inner tube 11 is made of a spiral corrugated tube having a smaller diameter and shorter length 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 radiating 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. Incidentally, the filamentous body 12 may be fixed to either the outer tube 10 or the inner tube 11 by means such as welding. 11 to outer tube 1
Just screw it inside the 0.

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.

This ventilation hole 17 may be formed by simply punching out a part of the inner tube 11, but as shown in FIG.
1 to form a cut-and-raised piece 18 connected at the upper end, and then insert the cut-and-raised piece 18 into the inner tube 11.
It is preferable to form it by bending it outward.

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 above, the evaporation section 1
When heat Q is applied to 5 from the outside and heat Q is removed from the heat radiation section 14, the working fluid 19 is vaporized in the evaporation section, and the vapor flows upward toward the heat radiation section 14 where the pressure is lower. 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 the filament 12 is sandwiched between the inner tube 11 and the outer tube 10 so that the working fluid vapor forms a spiral flow. 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 contacts the inner circumferential surface of the outer tube 10 at the heat radiating section 14, radiates heat there, and condenses and liquefies.

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, but the inner tube 11 and the outer tube Since a spiral space is formed between the inner tube 11 and the inner tube 11 by inserting the filament 12 therebetween, the hydraulic fluid flows outside the inner tube 11 in a spiral flow.

Therefore, in the above-mentioned thermosiphon, the inside of the inner tube 11 becomes the steam flow path, and the outside of the inner tube 11 becomes the working fluid flow path, so that gas-liquid separation is performed and the working fluid is not scattered by the steam flow. Therefore, there is almost no restriction due to the scattering limit, and 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, the inside of the evaporator section 15, where heat input is required, is eliminated. A sufficient amount of hydraulic fluid can be supplied to the entire circumferential surface.

Incidentally, the outer tube and inner tube according to the present invention are not limited to spiral corrugated tubes, and the outer tube and inner tube can be formed by 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 inside the outer tube 20. 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 portion 24 . On the other hand, the lower taper 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, the inner tube 21 has the striated body 2 as shown in FIG.
A large number of ventilation holes 27 are formed at positions that do not interfere with the ventilation holes 27. The ventilation hole 27 may be formed by simply punching it out as in the embodiment described above, or it may be formed as a circular hole having a cut and raised piece connected at the 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 when the inner diameter of the inner tube 21 is approximately 25φ, the diameter d of the vent hole 27 is preferably set to approximately 1φ≦D≦8φ.

Even if the outer tube 20 and the inner tube 21 are formed of straight tubes as shown in FIG. Since the inside of the inner tube 21 serves as a flow path for the working fluid vapor and the two are isolated, the working fluid is transferred to the evaporator 2.
5 can be sufficiently distributed and supplied to the entire area.

As described in detail, according to the present invention, the restriction on heat transport d due to the so-called scattering limit is eliminated, and the working fluid can be sufficiently distributed and supplied to the entire heat input location, so that heat can be reduced. The amount of heat transported was increased to an unprecedented level, and the amount of heat transported was increased several times compared to a typical thermosiphon.

Further, in the present invention, since the inner tube having a perforated structure may be inserted and fixed into the outer tube, it is possible to achieve good manufacturing workability.

[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...striatal body, 14.24...heat dissipation part,
15゜25...Evaporation part, 17.27...Vent hole,
18... cut and raised piece, 19.29... working fluid.

Claims (3)

[Claims] (1) An inner tube that is smaller in diameter and shorter than the outer tube and is open at least at the top end is inserted concentrically into an outer tube with a sealed structure that is arranged vertically, and the inner peripheral surface of the outer tube is arranged concentrically. A spiral filament is sandwiched between the inner tube and the outer peripheral surface of the inner tube, and substantially only a condensable working fluid is sealed inside the outer tube, and a large number of ventilation holes are provided in the peripheral wall of the inner tube. A vertical thermosiphon with gas-liquid separation. (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, characterized in that: (3) At least the inner tube of the outer tube and the inner tube is formed of a spiral corrugated tube, and the vent 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: