JPS5853277B2 - Netsuden Tatsuouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to transferring heat from a heating section to a cooling section in a heat transfer device that utilizes boiling and condensation of a liquid.

[Background of the invention]

FIG. 1 is a schematic diagram showing the configuration of a conventional heat transfer device.

This heat transfer device includes a heating section 1, a cooling section 2, a vapor riser pipe 3 and a liquid downcomer pipe 4 that connect them, forming a closed container. , alcohol, water, etc.).

When heat is applied from the outside of the heating section 1, the liquid 5 inside the heating section 1
receives the heat and causes boiling, and the generated steam rises in the steam riser pipe 3 due to the steam pressure difference and reaches the cooling section 2,
There, it releases the latent heat of condensation and becomes liquid 5.

This liquid 5 descends by gravity in the liquid downcomer pipe 4 and returns to the heating section 1, where the same cycle as before is repeated again.

On the other hand, the heat released by the cooling section 1 is removed from the outside by suitable cooling means such as forced convection of air or water or boiling of an evaporative liquid.

As explained above, in this conventional heat transfer device, the heating part 1 is heated by the boiling-condensation phenomenon of the liquid 5 contained in the heating part 1.
A large amount of heat applied to the outside can be transported to the cooling section 2.

However, in this conventional heat transfer device, from the heating section 1 to the cooling section 2,
It is not easy to stop heat transport to.

For example, it is possible to install a solenoid valve in the middle of the liquid downcomer pipe 4 to stop the return of the liquid 5, but the valve is unreliable due to leakage at the joints, and is expensive. .

Furthermore, in the event of a failure, the liquid 5 in the heating section 1 and cooling section 2 must be drained before replacement, which is extremely troublesome.

[Purpose of the invention]

The present invention aims to remedy the above-mentioned drawbacks and to provide a heat transfer device which is highly reliable and, in particular, can alleviate the backflow of steam from the heating section to the liquid downcomer.

[Embodiments of the invention]

FIG. 2 is a schematic diagram showing the configuration of the heat transfer device of the present invention.

This heat transfer device bends a part of the liquid downcomer pipe 4 into an inverted U shape to form a riser pipe 4', and the top of the liquid downcomer pipe 4 and the riser pipe 4' after leaving the cooling section 2. A heater 7 is provided in a part of the riser pipe 4' between the two.

Further, a tank 6 is provided in a part of the liquid downcomer pipe 4 after descending from the riser pipe 4'.

The amount of liquid 5 sealed in this heat transfer device is determined so that it can all be stored in cooling section 2.

FIG. 3 shows an enlarged view of the riser pipe 4' section. When input is applied to the heater 1, the riser pipe 4' is surrounded by the heater 7.
The liquid 5 inside boils, and the bubbles 5' generated at this time rise in the riser pipe 4' due to buoyancy.

At this time, the bubbles 5' push upward the liquid 5 in the vicinity thereof, so that the liquid 5 overflows over the top of the riser pipe 4' and descends into the tank 6.

The liquid 5 accumulated in the tank 6 enters the heating section 1 through a liquid downcomer pipe 4 connected to the lower part thereof.

The liquid 5 that has entered the heating section 1 receives heat from the outside and evaporates, and the steam generated at this time rises in the steam riser pipe 3 due to the vapor pressure difference and reaches the cooling section 2.

When the liquid 5 flows into the heating part 1 from the liquid downcomer pipe 4, a part of the vapor generated in the heating part 1 may flow back into the liquid downcomer pipe 4.

In such a case, the riser pipe l generated by the heater 7
However, in the present invention, since the tank 6 is provided, the movement of the backflow steam from the heating section 1 can be weakened at 22. , the pumping action in the riser pipe 4' continues as it is.

The liquid 5 liquefied by releasing the latent heat of condensation in the cooling section 2 eventually enters the riser pipe 4' surrounded by the heater 7, and repeats the same cycle as before.

When the input to the heater 7 is turned off, the liquid 5 in the riser pipe 4' will no longer boil, so the liquid 5 will no longer descend into the tank 6 beyond the riser pipe 4'.

Therefore, no new liquid 5 is supplied to the heating section 1, so after all the liquid 5 remaining in the heating section 1 evaporates and accumulates in the cooling section 2, heat is transferred from the heating section 1 to the cooling section 2. will no longer be conveyed.

In other words, the heat transfer device of the present invention shown in FIG.
Heat transport can be started or stopped.

In the heat transfer device of the present invention, the height of the top of the riser pipe 4' must be higher than the liquid level when all the liquid 5 is stored in the cooling section 2.

FIG. 4 shows a modification of the riser pipe 4' section.

This spirally wraps the riser pipe 4' above the heater 7, and also wraps the riser pipe 4' beyond the top of the riser pipe 4'.
A heat dissipating fin 14 is attached to the outside of the spacer.

The purpose of the spiral riser tube 8 is that the liquid 5 accumulated in the spiral riser tube 8 falls all at once into the tank 6 at the moment when the heater 7 is turned on. The system is designed so that heat transfer from the heating section 1 to the cooling section 2 can start immediately after the input is input to the heater 7.

The reason why the radiation fins 14 are provided is to condense the boiling bubbles in the riser pipe 4' after it passes the top of the riser pipe 4', and to cause this condensate to also fall into the tank 6. It is something that

FIG. 5 is also a modification.

This is a device in which a gas-liquid separation tank 6 is provided in the middle of the liquid downcomer pipe 4 between the tank 6 and the heating section 1.

The liquid 5 flows into the heating section 1 through the liquid downcomer pipe 4, but when the heater 7 is turned on and the liquid 5 starts to be supplied to the heating section 1, the heating section 1 and the liquid near the heating section 1 are still Since the downcomer pipe 4 is at a high temperature, a part of the evaporated vapor of the liquid 5 supplied to the heating section 1 flows backward through the liquid downcomer pipe 4, obstructing the flow of the liquid 5 from the liquid downcomer pipe 4 to the heating section 1. There are cases where

In order to alleviate this phenomenon, the backflow steam is captured in the gas-liquid separation tank 9, and the vapor release pipe 10
Steam is allowed to escape from the tank 6 to the cooling section 2 via the pressure short-circuit pipe 12 from the tank 6.

In some cases, the vapor relief pipe 10 may be directly connected from the gas-liquid separation tank 9 to the cooling section 2.

Also, one end of the pressure short-circuit pipe 12 is attached to the top of the riser pipe 4' and is connected to the cooling section 2, but the evaporated steam in the riser pipe 41 is released to the cooling section 2, and only the liquid 5 is kept in the tank 6. This is to make it possible to enter.

In the embodiment shown in FIG. 5, the tank 6 is located higher than the heater 7, but this is based on the idea that the liquid 5 is pumped from the cooling section 2 to the tank 6.

Therefore, in this case, the water head from the heating section 1 to the liquid level in the tank 6 becomes high, making it easier for the liquid 5 to flow into the heating section 1.

FIG. 6 is also a modification.

When the internal volume of the cooling section 2 is small, a liquid storage tank 13 is provided in the middle of the liquid downcomer pipe 4 between the cooling section 2 and the riser pipe 4'.

Further, as in the embodiment shown in FIG. 5, the top of the riser pipe 4', the liquid storage tank 13 and the cooling section 2 are connected by a pressure short-circuit pipe 12.

In other words, when the internal pressure in the riser pipe 4' increases too much due to the steam generated by inputting power to the heater 7, the liquid 5 flows into the cooling section 2, and the condensation area on the inner surface of the cooling section 2 decreases, resulting in poor heat transfer performance. heater 7 becomes bad or
This is to prevent a decrease in the flow rate of the liquid 5 supplied into the riser pipe 4' surrounded by the inner tube 4', thereby preventing the amount of liquid supplied to the heating section 1 from decreasing.

In this case, the steam generated in the riser pipe 4' is transferred to the pressure short-circuit pipe 1
The steam should reach the cooling part 2 through the cooling part 2, and this steam condenses in the cooling part 2.
It escapes into the atmosphere through the heat dissipation fins 2' attached to the outside.

FIG. 7 is also a modification.

This is done by attaching a cooler 16 to the riser pipe 4' between the top of the riser pipe A and the tank 6, and condensing the steam generated by boiling in the downward inverted riser pipe and flowing it into the tank 6. It was designed to be supplied.

The cooling unit 2 is also equipped with a cooler 15, and the cooler 16 and the cooler 15 are connected by a pipe 17.

In this case, a refrigerant (for example, Freon) flows into the cooler 15 to cool the cooling section 2, and then the refrigerant flows into the cooler 16, so that the temperature inside the riser pipe 4' is lower than the temperature inside the cooling section 2. It is necessary to make it a little more expensive.

This is because if the temperature inside the cooling section 2 is higher than the temperature inside the riser pipe 4', the liquid 5 is stored in the liquid storage tank 13 without inputting input to the heater 7 due to the vapor pressure difference. This is to prevent the liquid 5 from flowing out into the tank 6 beyond the top of the riser pipe 4' even when it is not desired to supply the liquid 5 to the heating section 1.

FIG. 8 shows an example in which the present invention is applied to a refrigerator.

The refrigerator 20 consists of a freezing compartment 21 and a refrigerating compartment 22, and the freezing compartment 21 is maintained at a predetermined temperature by a cooler 24 and a fan 23 for circulating cold air near the cooler 24.

The cooling unit 2 of the present invention is attached to the cooler 24,
The heating unit 1 provided in the upper part of the refrigerator compartment 22 is connected by a steam riser pipe 3 and a liquid faller pipe 4.

A liquid storage tank 13, a riser pipe 4', a heater 7, and a tank 6 are provided in the middle of the liquid downcomer pipe 4.

By feeding back a signal from a temperature sensor 28 provided in the refrigerator compartment 22 to the heater 7, and turning on or off the input to the heater 7 based on this signal, the temperature inside the refrigerator compartment 22 can be maintained at a predetermined temperature. Can be done.

FIG. 9 is a piping system diagram of the refrigerator 20 shown in FIG. 8.

In the case of a refrigerator, a liquid refrigerant (such as Freon) compressed by a compressor 27 and condensed by a condenser 26 is adiabatically expanded by an expansion valve or capillary tube 25, and then led to a cooler 24.
The refrigerant vapor evaporated in the cooler 24 is returned to the compressor 27 again.

As mentioned above, the cooling part 2 of the present invention is attached to this cooler 24, and the cooler 24 absorbs the heat released by the cooling part 2.

FIG. 10 is an example in which the present invention is applied to a wind fan.

The wind fan 30 is attached to a window or wall 37 that partitions an indoor room 31 and an outdoor room 32.

The wind fan 30 consists of an upper fan box 33 and a lower fan box 34. The upper fan box 33 includes a fan 35 and the cooling unit 2 of the present invention, and the lower fan box 34 includes a fan 36 and the heating unit of the present invention. Part 1
is provided.

The heating section 1 and the cooling section 2 include a steam riser pipe 3 and a liquid downcomer pipe 4.
A liquid storage tank 13, a riser pipe 4', a heater 7, and a tank 6 are provided in the middle of the liquid downcomer pipe 4.

This winter, indoor room 31 is heated, and find fan 30
Consider the case where exhaust heat is recovered during ventilation.

The fan 36 sends dirty air inside the room 31 to the outside 32, and the fan 35 sends fresh air from the outside 32 to the room 31.
However, since indoor 31 is heated, outdoor 32
Since the temperature is higher, it would be uneconomical in terms of energy if the air inside the room 31 is discharged directly to the outside 32.

Therefore, the heat transfer device of the present invention is intended to recover waste heat, but when input is input to the heater 7 and the liquid 5 is sent to the heating section 1, the air in the indoor room 31 is transferred to the outdoor 3.
When the liquid 5 is sent out by the second-height fan 36, it comes into contact with the outer surface of the heating section 1 and gives heat to the liquid 5.

The vapor evaporated at this time ascends the steam riser pipe 3 and cools the cooling section 2.
It cools down, releases the latent heat of condensation, and becomes a liquid.

The condensation heat released at this time is given to fresh air sucked in from the outside 32 by the fan 35 from the outer surface of the cooling unit 2.

That is, exhaust heat is recovered by the heat transfer device of the present invention.

When the indoor room 31 is being cooled in the summer, if you do not want the cold air in the indoor room 31 to escape by ventilating it to the outside, input is input to the heater 7 and the fans 35 and 36 are rotated in the opposite direction so that the cool air is removed from the upper fan box 33. The air inside the room 31 may be sent out, and the air outside the room 32 may be taken in from the lower fan box 34.

Also, during summer nights, cool air from outside 32 is brought indoors 3.
If you want to ventilate and cool the high-temperature air in the room 31 to the outside 32, you can turn off the input to the heater 7 and stop the heat exchange by stopping the circulation of the liquid 5.

〔Effect of the invention〕

As explained above, according to the present invention, the amount of heat transferred can be controlled in an inexpensive manner without using a high-grade valve.
Its reliability has also been improved.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional heat transfer device, Fig. 2 is a block diagram of a heat transfer device of the present invention, Fig. 3 is a detailed diagram of the riser pipe section of the present invention, and Fig. 4 is a block diagram of the riser pipe section. FIGS. 5 to 7 show modified examples of the heat transfer device of the present invention, and FIGS. 8 to 10 show applied examples. 1... Heating section, 2... Cooling section, 3...
...Hot air riser pipe, 4...Liquid downcomer pipe, 4'
-・・・Rise pipe, 5...Liquid, 6...
...Tank, 7...Heater, 8...
・Spiral riser pipe, 9...gas-liquid separation tank,
10... Steam relief pipe, 12... Pressure short circuit pipe, 13... Liquid storage tank, 14...
... Radiation fins, 15,16°24 ... Cooler, 20 ... Refrigerator, 21 ... Freezer compartment,
22... Refrigerator room.

Claims (1)

[Scope of Claims] 1. A cooling section is provided in a closed container configured in a loop shape by a heating section, a cooling section located at a higher position than the heating section, and a steam rising pipe and a liquid downcomer pipe connecting the heating section and the cooling section. A portion of the liquid downcomer pipe is formed into an inverted U-shaped riser pipe, and a heater is disposed on the side of the riser pipe closer to the cooling part, and A heat transfer system in which a tank is provided in the middle of the liquid downcomer pipe between the inverted U-shaped riser pipe and the heating section, and the amount of heat transferred from the heating section to the cooling section can be controlled by the input armature to the heater. Device. 2. A liquid storage tank is provided between the riser pipe and the cooling section,
A heat transfer device according to claim 1, wherein an amount of evaporative liquid that can be stored in a liquid storage tank and a cooling section is sealed in a closed container configured in a loop shape.