JPS5838719B2 - Netsuden Tatsuouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to the interior of a closed container consisting of a heating section (evaporation section), a cooling section (condensation section) located above the heating section, and a steam riser pipe and a liquid return pipe that communicate these parts. The present invention relates to a heat transfer device in which an evaporative liquid is sealed in a evaporative liquid, and heat is transferred between a heating part and a cooling part by utilizing the evaporation and condensation action of the evaporative liquid.

In general, in conventional heat transfer devices of this kind, controlling the amount of heat transfer between the heating section and the cooling section requires complicated equipment such as controlling the amount of evaporation and condensation of the evaporative liquid. Sex isn't good either.

The present invention includes means for controlling the amount of heat transferred to the liquid return pipe of a closed container that is composed of a heating section, a cooling section, and a vapor riser pipe and a liquid return pipe that communicate these parts, and in which an evaporative liquid is sealed. With this control means, the amount of heat transferred from the heating section to the cooling section can be easily and reliably controlled with a small heat input.

Hereinafter, an example of the heat transfer device of the present invention will be explained with reference to FIG.

In FIG. 1, a heating section (evaporation section) 1 and a cooling section (condensation section) 2 located above the heating section 1 are communicated through a steam riser pipe 3 and a liquid return pipe 4, and these constitute a closed container. ing.

A predetermined amount of evaporative liquid 5 is sealed inside this airtight container.

A heater 6 is provided in the liquid return pipe 4 as a means for controlling the amount of heat transfer.

15 is a temperature sensor provided near the heating section 1.

When the heating section 1 is heated, the evaporative liquid 5 in the heating section 1 receives the heat and boils, and the vapor generated thereby flows into the cooling section 2 through the steam riser pipe 3 due to the vapor pressure difference.

Although not shown, the steam that has entered the cooling section 2 is condensed by releasing heat around the cooling section by forced air cooling 6 or external cooling means such as a cooler or the like.

The condensed evaporative liquid passes through the liquid return pipe 4 by gravity,
It flows into the heating section 1 again.

Thereafter, flow 2 is repeated, and heat is transferred from the heating section 1 to the cooling section 5.

In such heat transfer, when the heating heater 6 is energized, the flow rate of the evaporative liquid 5 descending through the liquid return pipe 4 can be controlled.

That is, the evaporative liquid 5 descending down the liquid return pipe 4 is boiled by the heat from the heater 6 and generates bubbles.

These bubbles come to block the liquid return pipe 4, and the amount of the evaporative liquid 5 falling through the liquid return pipe 4 is controlled in accordance with the amount of heat generated by the heater 6.

In this way, by controlling the amount of evaporative liquid 5 that returns from the cooling section 2 to the heating section 1, the amount of evaporative liquid 5 that accumulates in the heating section 1 can be increased or decreased, and the amount of evaporative liquid 5 that is returned from the heating section 1 to the cooling section 2 can be increased or decreased. The amount of transmission increases or decreases.

If the evaporative liquid 5 does not return from the cooling part 2 to the heating part 1, all the evaporative liquid 5 that has been present in the heating part 1 will accumulate in the cooling part 2, and eventually the heating part 1 will have no evaporative liquid. Since the liquid 5 disappears, heat is no longer transmitted from the heating section 1 to the cooling section 2.

From these things, 1. The internal volume of the cooling section 2 must be large enough to accommodate the evaporative liquid 5.

Since the specific volume of the evaporative liquid 5 is very small compared to that of vapor, the inner diameter of the liquid return pipe 4 can be made smaller than the inner diameter of the vapor riser pipe 3, as shown in FIG. This is the determination of the structure and inner diameter of the liquid return pipe 4.

As shown in Fig. 2, if the inner diameter is large, the bubbles I generated by the heating of the heater 6 are difficult to coalesce, and the evaporative liquid 5 leaks downward through the bubbles 7 that rise due to buoyancy. , the flow of the evaporative liquid 5 cannot be blocked by the bubbles 7.

If this were to be made possible, a very large amount of input would have to be applied to the heater 6.

Figure 3 shows the inside of the liquid return pipe 4 when the inner diameter is made thinner. In this case, the generated steam 7 tends to coalesce and grow larger, and the diameter of the bubbles 7 is smaller than that of the liquid return pipe. 4, the bubbles 7 create a piston flow and push the evaporative liquid 5 upwards, so the bubbles 7 eventually prevent the liquid from returning.

The smaller the inner diameter of the liquid return pipe 4, the less the input to the heating heater 6 will be.However, it goes without saying that the inner diameter must be large enough to always supply the evaporative liquid that can remove the amount of heat applied to the heating section 1. That's a good thing.

In addition, because we want to reduce the input to the heater 6 and to independently control the input to the heater 6, the thin liquid return pipe 4 is made integral with the steam riser pipe 3, which is thicker and has a larger heat capacity. It is better not to make them come into contact with each other.

When controlling the amount of heat generated by the heater 60, the signal from the temperature sensor 15 provided near the heating section 1 is sent to the heater 60.
6, the heat can be transported or blocked from the heating section 1 to the cooling section 2 at a predetermined temperature, as shown in FIG.

5 to 10 show other examples of the structure of the heat transfer amount control means disposed in the liquid return pipe 4. FIG.

In FIG. 5, a heater 6 is provided in the liquid return pipe 4, and a heater 6 is provided outside the liquid return pipe 4 shown in FIG.
Compared to the case where the heating element J-6 is provided with a heat exchanger, the heat is transferred to the evaporative liquid 5 more quickly, the control speed becomes faster, and the loss of heat from the heating heater J-6 to the outside air of the liquid return pipe 4 can be reduced.

In FIG. 6, a recess is provided in a part of the liquid return pipe 4, and a heating heater 6 is embedded in this recess, so that in the event of a malfunction of the heating heater 6, the heating heater 6 can be replaced without draining the evaporative liquid 5 inside. This is how it was done.

In FIG. 7, internal fins 14 are provided on the inner wall of the liquid return pipe 4 section to which the heater 6 is attached, and the internal fins 14 make it easier for the heat of the heater 6 to be transmitted to the evaporative liquid 5. It is.

In Figure 8, the liquid return pipe 4 is divided into a plurality of thinner branch pipes 4', each branch pipe 4' is provided with a heating heater 6, and input is applied to each heating heater 6 at the same time to prevent liquid return. This is what I did.

In this way, the heat transfer area increases, so the heat generated from the heating heel 1-6 is quickly transferred to the liquid 5, and
Liquid return can be quickly prevented.

Further, in this case, if some of the plurality of heaters 6 are energized and the rest are not energized, it is possible to control the amount of liquid returned in proportion to the number of non-energized heaters for all the heaters.

In FIG. 9, the liquid return pipe 4 is indirectly heated with steam.

A heating heater 6 is provided at one end of a closed container 8 lined with a porous material 9 (for example, cloth, felt metal, wire mesh), and the other end is thermally connected to the liquid return pipe 4.

The porous material 9 is impregnated with an evaporative liquid (for example, water, Freon, alcohol), and when input is applied to the heater 6, the liquid in the porous material 9 in the vicinity receives heat and evaporates. The generated steam moves toward the other end provided in the liquid return pipe 4 due to the steam pressure difference, where it releases latent heat of condensation and condenses.

This heat is transferred to the evaporative liquid 5 in the liquid return pipe 4, and bubbles 7 are generated in the liquid return pipe 4, thereby preventing the liquid from returning.

On the other hand, the condensed liquid is returned to the part 8 near the heater 6 by the capillary force of the porous material 90, and the same cycle as before is repeated.

The advantage of this example is that by increasing the heat transfer area between the heating heater 6 and the closed container 8, the heat generation density of the heating heater 6 can be kept low, and the life of the heating heater 6 can be improved.

Even if the contact area between the heating heater 6 and the sealed container 8 is made large, if the heat transfer area between the sealed container 8 and the liquid return pipe 4 is made small, the evaporative liquid 5 in the liquid return pipe 4 can be reduced. The heat flow density can be such that boiling can occur.

That is, in this example, an operation was performed to change the heat flow density from a small heat flow density to a high heat flow density as a measure for the lifespan of the heater 6.

The example shown in FIG. 10 is also the same as that shown in FIG. 9, but the structure is slightly different.

That is, the inside of the closed container 8 is only lined with a porous material and filled with an evaporative liquid 5'.
Since gravity can be used, the liquid q condensed in the upper part can fall from the upper part of the closed container 8 to the lower part.

Further, in this example, the evaporative liquid 5 inside the liquid return pipe 4 is directly heated as in FIG. 5 or 6.

11, 13, 14, and 17 show other examples of the heat transfer device of the present invention.

In the example of FIG. 11, depending on the circumstances, the cooling section 2 is
If you do not have enough internal volume to store all of the
Instead, a liquid reservoir tank 10 is provided in a part of the liquid return pipe 4.

Therefore, it is sufficient that the total internal volume of the tank 10 and the cooling section 2 is equal to or larger than the required amount of the evaporative liquid 5 to be filled.

The example shown in FIG. 13 further develops the principle of the present invention and reduces the input applied to the heating heater 6. The example shown in FIG. A plurality of closed containers according to the present invention each comprising a liquid return pipe 4 and a steam riser pipe 3 are configured to exchange heat between the liquid return pipe 4 and the heating section 1.

FIG. 13 shows a case where there are three sealed containers.

The liquid return pipe 4-a of the first-stage sealed container is equipped with a heater 6, but the liquid return pipe 4-a of the second-stage sealed container is
-b and the liquid return pipe 4-c of the third stage sealed container are not equipped with a heater.

However, a part of the liquid return pipe 4-b of the second-stage sealed container is
A part of the liquid return pipe 4-c of the third stage sealed container is connected to the heating section 1-a of the sealed container of the second stage.
-b are thermally bonded to each other, and heat exchange occurs at the bonded portions.

First, when input is applied to the heater 6 attached to the liquid return pipe 4-g of the first stage airtight container, the evaporative liquid 5 in the heating part 1-a disappears and is cooled based on the principle explained earlier. It accumulates in part 2-a.

That is, since the heating section 1-a cannot remove heat applied from the outside, its temperature inevitably rises.

When the temperature of the heating section 1-a rises, the temperature of the liquid return pipe 4-b of the second-stage sealed container provided therein also rises, and the evaporative liquid 5 therein boils. After all, cooling section 2-
Block the flow of evaporative liquid returning from b.

Similarly, the flow of the evaporative liquid 5 is also blocked in the liquid return pipe 4-C of the third-stage sealed container, and the evaporative liquid in the heating section 1-c will soon disappear.

FIG. 13 shows a state in which the evaporative liquid 5 in the heating section 1-c of the third-stage closed container is beginning to run out.

According to experiments, in one sealed container, the amount of heat applied from the outside of the heating section 1-a of the first stage sealed container is about 115
Liquid return can be prevented by simply applying the following input to the heating heater 6 installed in the liquid return pipe 4-a of the first-stage sealed container, so three sealed containers can be combined as shown in Figure 13. For example, it is possible to transport or block 125 times the amount of heat from the heating section to the cooling section with just one heater.

Therefore, by increasing the number of combinations of sealed containers, it is possible to significantly increase the amount of heat that can be controlled manually by the heater.

In this example, it must be noted that since the evaporative liquid 5 is returned using gravity, the heating section 1-a of the first-stage sealed container is replaced by the heating section 1-a of the second-stage sealed container. It is necessary to install the heating section i-b of the second-stage sealed container at a higher position than the heating section 1c of the third-stage sealed container.

The example shown in FIG. 14 is an improved version of the example shown in FIG. 13, and includes three cooling sections 2-a and 2-b in FIG.
, 2-c into one, and three steam riser pipes 3
-a, 3-b*3c is also the steam riser pipe 3 of the third stage closed container
- All are connected to C.

In this way, the entire device can be made compact.

In the examples shown in FIGS. 13 and 14, the liquid return pipes 4-b and 4-c of the second-stage and subsequent sealed containers are connected to the heating section 1 of the previous-stage sealed container.
The problem is how to exchange heat with -a and 1-b.

This is because depending on how you choose the location and how you make contact,
The evaporative liquid 5 in the liquid return pipes 4-b and 4-c is transferred to the heating section 1-
This is because even if the evaporative liquid 5 still exists in a and 1-b, it may boil and prevent the liquid from returning.

In order to eliminate this, the second
The liquid return pipe 4-b of the sealed container in the first stage is immersed in the evaporative liquid 5 in the heating section 1-a of the sealed container in the first stage, and is not allowed to come into contact with the vessel wall or fins 1' of the heating section 1-a. It's better.

In addition, the liquid return pipe 4-b is connected to the liquid return pipe 4-a and the heating section 1-a so that the liquid return pipe 4-b is easily cooled by the evaporative liquid 5 returning from the liquid return pipe 4-a of the first stage sealed container. It is best to install it near the joint.

FIG. 16 shows an embodiment in which the heating section 1 has a pipe-like shape.

It is better to insulate the liquid return pipes 4-a and 4-b with a heat insulating material 11 so that they are not affected by heat from the outside.

In the example shown in FIG. 17, a cooler 24 is attached to the upper part of the cooling section 2, so that the heat of the cooling section 2 can be removed by appropriate cooling means (for example, evaporation of liquid, etc.).

Heating section 1-a*1-b, cooling section 2. Steam riser pipe 3. Although the number of closed containers consisting of liquid return pipes 4-a and 4-b is shown for two cases, there is no difference in principle whether there are three or four.

FIG. 18 also shows another example of the heat transfer device of the present invention.

In this example, the heating section 1 is used as a heat transfer amount control means.
A part of the heat added to the liquid return pipe 4 is provided with fins 12 to make it easier to collect the heat.

Further, a shutter 13 is attached to the outside of this fin 12, and by adjusting the opening degree of this shutter 13, the amount of heat for heating the liquid return pipe 4 can be changed, and the amount of heat transfer can be controlled. be.

FIG. 12 is an example in which the heat transfer device of the present invention is applied to a refrigerator.

The refrigerator 20 is divided into a freezer compartment 21 and a refrigerator compartment 22, and the freezer compartment 21 is maintained at a predetermined temperature by a cooler 24 and a fan 23 for circulating cold air near the cooler 24 into the freezer compartment 21. There is.

In the heat transfer device of the present invention, the cooling section 2 is attached to the cooler 24, and the heating section 1 is provided in the upper part of the refrigerator compartment 22.

The heating section 1 and the cooling section 2 are connected by a steam riser pipe 3 and a liquid return pipe 4.

If the temperature of the refrigerator compartment 22 is detected by a temperature sensor 15 (for example, a thermistor) and the input of the heating heater 60 attached to the liquid return pipe 4 is controlled based on the signal from the temperature sensor 15, the heat in the refrigerator compartment 22 can be reduced. is the cooler 24 attached to the cooling unit 2 based on the principle explained earlier.
The temperature of the refrigerator compartment 22 is maintained at a predetermined temperature.

Note that the input to the heater 6 does not necessarily have to be in a rectangular shape with respect to time, but can be input in a sawtooth or sinusoidal shape taking into account the heat capacity of the liquid return pipe 4 and the heat dissipation conditions of the outer surface of the heater 6. It doesn't matter.

FIG. 19 shows an example in which the heat transfer device of the present invention is applied to temperature control of a house 30.

The house 30 is separated into a first indoor room 31 and a second indoor room 32, which is effective when the temperature of the first indoor room 31 and the second indoor room 32 is to be managed separately.

A cooler 33 is installed in the first chamber 31 to maintain an appropriate temperature.

In the heat transfer device of the present invention, the heating section 1 is provided in the second chamber, and the cooling section 2 is provided in the first chamber, and these are connected by a steam riser pipe 3 and a liquid return pipe 4.

A heating heater 6 is attached to the liquid return pipe 4, and the temperature in the second chamber 32 is controlled by controlling the input of this heating heater 60.

Although the temperature control of refrigerators and houses has been described above as an application example of the heat transfer device of the present invention, the heat transfer device of the present invention can also be applied to various other devices such as exhaust heat recovery type wind fans.

As explained above, according to the present invention, the transport of a large amount of heat can be controlled with a small electrical input or thermal input, the reliability is increased, the cost is low, and maintenance and inspection are simplified.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of the heat transfer device of the present invention, and FIG.
3 and 3 are diagrams explaining the control of the amount of heat transfer, FIG. 4 is a diagram showing the relationship between the temperature of the heating part and the amount of heat transfer in the heat transfer device of the present invention, and FIGS. 5 to 10 are diagrams of the present invention FIGS. 11 and 13 are diagrams showing other examples of the heat transfer amount control means in the heat transfer device. 14 and 17 are schematic diagrams showing other examples of the heat transfer device of the present invention, and FIGS. 15 and 16 are diagrams showing the arrangement of the heating section and liquid return pipe in the example shown in FIGS. 13 and 14. A diagram showing an example of thermal bonding, FIG. 18 is a schematic diagram showing still another example of the heat transfer device of the present invention, and FIGS. 12 and 19 are diagrams explaining application examples of the heat transfer device of the present invention. It is. 1, 1-at 1-b, 1-c-heating section, 2.2a
e 2 be 2 c"' Cooling section, 3.3-a, 3
-S, 3-c-Steam riser, 4.4-a, 4-b. 4-c...liquid return pipe, 5...evaporable liquid, 6...
・Heating heat wave -10...Menta, 15...Temperature sensor.

Claims (1)

[Claims] 1. An evaporative liquid is sealed inside a sealed container consisting of a heating section, a cooling section, and a steam riser pipe and a liquid return pipe that communicate these, and the heating section and cooling section are separated by using the evaporation-condensation action of the evaporative liquid. In the heat transfer device, the liquid return pipe is provided with a heater as a local heating means for generating bubbles sufficient to prevent the flow of the liquid, and the liquid return pipe generated by the heater is heated by a heater. A heat transfer device that controls the amount of heat transfer between the heating section and the cooling section by causing air bubbles to rise in the opposite direction to the flow direction of the liquid descending inside, thereby blocking the flow of the liquid. .