JPS621591Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a heat transfer device, in particular, utilizes the phase change between the liquid and steam of the working fluid sealed in the pipe to transport the heat absorbed in the heat receiving part to the heat radiating part. The present invention relates to a heat transfer device for dissipating heat.

The schematic structure of a conventional heat transfer device of this type is shown in the accompanying drawing, FIG. 1, in which:
Reference numeral 1 indicates a heat receiving section arranged horizontally above, 2 indicates a heat dissipating section arranged vertically below, 3 is 3A,
3B is a check valve that allows flow only in one direction;
4 is an accumulator, and 5 is a liquid reservoir, which is located between the heat receiving section 1 and the accumulator 4 and above the heat receiving section 1. Further, as shown in FIG. 2 of the attached drawings, 6 is pivotably supported in the liquid reservoir 5 so as to be able to swing around a fulcrum 0, and when no liquid is stored inside, the center of gravity is below the fulcrum 0. When the opening is located above with point G ₁ and a predetermined amount of liquid is stored, the center of gravity G ₂ moves above the fulcrum 0 and automatically rotates, draining the liquid inside. It is a rotating liquid reservoir that discharges to the outside, that is, into the liquid reservoir 5. Further, 7 is a pipe, 7A is a pipe between one end of the heat receiving part 1 and one end of the heat radiating part 2, and 7B is a pipe between the other end of the heat radiating part 2 and the check valve 3A. 7C is a conduit between the check valve 3A and the bottom of the accumulator 4, 7D is a conduit between the bottom of the accumulator 4 and the check valve 3B,
7E is a pipe between the check valve 3B and the upper part of the liquid reservoir 5, and 7F is a pipe between the bottom of the liquid reservoir 5 and the other end of the heat receiving part 1. Each pipe 7
forms a loop, so-called a closed pipe line, and a suitable amount of working fluid 8, which is a condensable liquid such as fluorocarbon or methyl alcohol, as a heat transport medium is sealed in the pipe line 7 including the accumulator 4, and check valves 3A, 3
B cooperates to allow the working fluid 8 from the heat radiating part 2 to flow only toward the heat receiving part 1 via the liquid reservoir 5. In this way, at the time of startup,
The pipe line 7 other than the upper part of the accumulator 4 is filled with a liquid working fluid 8. Hereinafter, this liquid working fluid 8 will be simply referred to as liquid 8A, whereas the gaseous working fluid 8 will be simply referred to as vapor 8B.

The operation of such a conventional device will be described next.

First, when heat is supplied to the heat receiving section 1, the liquid 8A in the heat receiving section 1 generates high pressure steam 8B corresponding to the given temperature, creating a pressure difference between the heat receiving section 1 and the accumulator 4. As a result, the pressure in the heat receiving part 1 is higher than that in the heat receiving part 1, so the liquid 8A in the pipe 7A, the heat radiating part 2, and the pipe 7B flows into the accumulator 4 through the check valve 3A, and the pressure in the accumulator 4 is gradually increased. .

The steam 8B generated in the heat receiving part 1 reaches the heat radiating part 2, where it is cooled, releases the heat of condensation, and becomes liquefied. Therefore, this is regulated by the temperature of the heat receiving part and the temperature of the heat radiating part. Heat receiving part 1, pipe line 7
The pressure of the steam 8B in the heat receiving part 1 and the heat receiving part 2 is a saturated vapor pressure corresponding to a temperature approximately intermediate between the heat receiving part temperature and the heat radiating part temperature, and therefore, the liquid 8A is evaporated in the heat receiving part 1. During this time, the pressure of the accumulator 4 is also maintained at approximately this pressure.

In this state, the steam 8B generated in the heat receiving part 1 reaches the heat radiating part 2 and is liquefied again, so that the heat in the heat receiving part 1 is transferred to the heat radiating part 2. This continues until there is no more liquid 8A in 1. When all of the liquid 8A in the heat receiving part 1 evaporates, the pressure of the steam 8B in the heat receiving part 1, the piping 7A, and the heat radiating part 2 is regulated only by the temperature of the heat radiating part 2, and becomes low. Since a pressure difference is generated between the two and the pressure in the accumulator 4 is high, the liquid 8A stored in the accumulator 4 flows from the pipe 7D to the liquid reservoir 5 through the check valve 3B and the pipe 7E. However, the liquid 8 that entered the liquid reservoir 5
A remains in the rotating liquid reservoir 6, and when a predetermined amount of liquid 8A is stored in the rotating liquid reservoir 6, it is turned, so that it flows back to the heat receiving part 1 from the bottom of the liquid reservoir 5 through the pipe 7F. become. At this time, if the rotating liquid reservoir 6 is not provided, the liquid 8A refluxed from the accumulator 4 will enter the heat receiving part 1 as it is, and only a small amount of the liquid 8A refluxed to the heat receiving part 1 will be there. High-pressure steam 8B is generated, the pressure in the heat receiving section 1 becomes higher than the pressure in the accumulator 4, and the return flow of the liquid 8A to the heat receiving section 1 is stopped. This means that
This means that a state in which there is no liquid 8A in the heat receiving part 1 frequently occurs, and as a result, the heat transport efficiency decreases. Therefore, by providing the rotary liquid reservoir 6, at least the volume of the liquid 8A can be returned to the heat receiving part 1 by one return of the liquid 8A, so that the heat transport efficiency can be increased.

The above operations are repeated in sequence, and the heat from the heat receiving part 1 located at the top is transferred to the heat radiating part 2 located at the bottom.
In addition, heat can be transported without using any power.

Because conventional heat transfer devices are configured and operate as described above, it is not possible to control the temperature of the heat receiving section and the heat dissipating section, and there is a situation where the heat receiving section temporarily runs out of working fluid. As a result, the heat-receiving part overheats, and the temperature of the heat-receiving part rises abnormally, albeit temporarily.

It is an object of the present invention to provide a heat transfer device that eliminates the drawbacks of conventional devices and can appropriately return liquid to the heat receiving section regardless of the presence or absence of liquid in the heat receiving section. .

In order to achieve this objective, the present invention detects either the temperature or pressure of steam in the heat receiving part and in any part of the pipe line from the heat receiving part to the outlet pipe of the working fluid of the heat dissipating part. When either the element, the heating source that heats the heat receiving part, or the temperature converted from the temperature and pressure detected by the detection element become below a certain predetermined lower limit temperature, the heating source increases the heating amount. , when the temperature exceeds the upper limit temperature, which is higher than the lower limit temperature by a certain temperature range, the heating source at least reduces its heating amount; and a control device that is set so that the differential pressure is greater than the pressure difference required to circulate the heat from the heat radiating section to the heat receiving section.

Hereinafter, the present invention will be explained based on the accompanying drawings showing one embodiment thereof.

In FIG. 3, a heat receiving section 1, a heat dissipating section 2, first and second check valves 3A and 3B, an accumulator 4,
Liquid reservoir 5, rotating liquid reservoir 6, pipe line 7, that is, 7A to 7
F and working fluid 8 are all exactly the same as those in conventional devices. Further, reference numeral 11 is a heat source for heating the heat receiving part 1, for example, a gas burner, and the heat source 11 is a control device, for example, an ON
-OFF switch 12 starts or stops heating. In addition, the above control device, for example, ON
-The OFF switch is operated by steam 8 of working fluid 8.
In the part where B flows, that is, in the heat receiving part 1, in the pipe line 7A from the heat receiving part 1 to the heat radiating part 2, or in the pipe line 7B at the outlet part of the working fluid 8 of the heat releasing part, for example, , inserted into the conduit 7A,
Alternatively, it is activated by a detection signal of the steam temperature from a detection element 13, which is provided in contact with the pipe wall and which detects the steam temperature of the working fluid 8 contained therein, and is composed of, for example, a thermocouple. This detection element 13 detects that the steam temperature has fallen below a certain predetermined lower limit temperature _TA , and that from the lower limit temperature _TA ,
The pressure difference in the steam 8B of the working fluid 8 caused by the temperature difference in the predetermined temperature range ΔT causes the working fluid 8 to move into the heat radiation section 2.
This device detects both the fact that the steam temperature has risen above the upper limit temperature T _B which is set higher by a predetermined temperature width ΔT that causes a pressure difference larger than the pressure difference required for reflux from the steam to the heat receiving part 1. If it is detected by this detection signal that the temperature has fallen below the lower limit temperature T _A , the control device 12 is activated, for example, the heating source 11 is activated to heat the heat receiving part 1, and , when it is detected that the temperature has risen above the upper limit temperature, the control device 12 is activated to, for example,
The heating source 11 is stopped, and heating of the heat receiving part 1 is stopped.

The device of the present invention is constructed as described above, but its operation is as follows: Freon R-114 is used as the working fluid, the lower limit temperature T _A is 50°C, the upper limit temperature T _B is 60°C,
An example in which the predetermined temperature range ΔT is 10° C. will be explained.

First, heat is supplied to the heat receiving part 1, and the liquid 8A evaporates to become vapor 8B. This vapor 8B is carried to the heat radiating part 2 and condensed in the heat radiating part 2, so that the heat radiating part 2 radiates heat. By this, the heat receiving part 1
Transporting heat from the radiator to the heat radiating section 2 is exactly the same in both the present invention and the conventional device.

In the device of the present invention, in the initial state under such conditions, the steam temperature is lower than the lower limit temperature of 50°C,
Therefore, the heating source 11 is put into operation by the detection element 13 and the control device 12, and heating is started.

As heating continues by the heat source 11 in this manner, the steam temperature in the heat receiving section and the pipe line 7A gradually rises, and this heating continues until the upper limit temperature reaches 60°C.

In this way, the above steam temperature is increased to an upper limit of 60℃.
When the detection element 13 detects this, the control device, for example, ON-
The OFF switch is activated to switch the heating source 11 and stop heating. The steam pressure at this time was 5.9Kg/ ^cm2 , as seen in the saturated steam pressure curve of Freon R-114 shown in Figure 4 of the attached drawings, and at the same time, the pressure inside the accumulator 4 was also 5.9Kg/cm2. Since they communicate through the 1 check valve 3A, the pressure is the same.

When the heat source 11 stops heating in this way, the steam is only cooled by the heat radiation section 2, and the temperature gradually decreases, and the pressure also decreases at the same time. In this way, when the steam temperature falls below 50°C, the detection element 13 again issues a detection signal to detect the lower limit temperature of 50°C, which causes the control device 12 to operate again to switch and start heating again. At this time, the pressure of the steam 8B decreases to 4.3 kg/cm ² as shown in FIG. Therefore, the pressure inside the accumulator 4 is the saturated vapor pressure of 5.9, which corresponds to the upper limit temperature of 60°C.
Kg/ ^cm2 , a pressure difference of 1.6Kg/ ^cm2 is created between the accumulator 4 and the heat receiving part 1.
This pressure difference is 1.6Kg/ ^cm2 , so the accumulator 4
From there, the liquid 8A flows back to the liquid reservoir 5, and as a result, the liquid 8A flows back to the heat receiving section 1.

By repeating the above operations, heat is transferred from the heat receiving part 1 to the heat radiating part 2, and moreover, the heat is refluxed without using external force.

Since the device of the present invention is constructed and operated as described above, the pressure fluctuation of the steam, which is the reflux force of the liquid 8A, is
This occurs regardless of the presence or absence of the liquid 8A in the heat receiving part 1, so when the liquid 8A is always present in the heat receiving part 1, the liquid 8
Since A can be refluxed, it is possible to control the steam temperature, and therefore the temperature of the heat receiving part and the heat radiating part, to be between, for example, a lower limit temperature of 50°C and an upper limit temperature of 60°C, and the temperature of the heat receiving part This has the effect of preventing the temperature of the heat receiving part 1 from rising abnormally due to the lack of liquid in the heat receiving part 1.

In the above embodiment, the detection element 13 is provided in the pipe 7A through which the steam 8B passes, but the detection element 13 is not limited to this. A detection element may be inserted or brought into contact to detect the temperature inside the outlet side pipe 7B or the pipe wall thereof, or alternatively, the steam pressure in the heat receiving section 1 or the pipe 7A may be directly detected. Accordingly, the heating source may be controlled based on the saturated vapor pressure corresponding to the lower and upper temperature limits, and in any of these cases, the effect is no different from that of the above embodiment.

Furthermore, the operation of the heating source 11 can be turned on and off via the detection element 13 and the control device 12, thereby heating or not heating at all, according to the method of the above embodiment. However, the heating source itself is not limited to a high heating source whose heating capacity is set so that it operates below the lower limit temperature and the temperature after heating is above the upper limit temperature, and a high heating source whose heating capacity is set so that the heating source itself operates above the upper limit temperature and the temperature after heating is above the upper limit temperature. There is no problem even if the heating source is configured with a low heating source whose heating capacity is set to be lower than the temperature, and the effect is not different from that in the above embodiment.

[Brief explanation of the drawing]

Fig. 1 is a structural diagram showing an example of a conventional heat transfer device, Fig. 2 is a cross-sectional view of the structure showing a liquid reservoir and a rotating liquid reservoir used in the conventional device, and Fig. 3 is a heat transfer system of the present invention. FIG. 4 is a structural diagram of an embodiment of the apparatus, and is a saturated vapor pressure curve diagram of Freon R-114 as a working fluid. 1...Heat receiving part, 2...Heat radiating part, 3A, 3B...
First and second check valves, 4...Accumulator, 5
...Liquid reservoir, 6...Rotating liquid reservoir, 7,7A to 7F...
...Pipeline, 8...Working fluid, 8A...Liquid, 8B...
Steam, 11...Heating source, 12...Control device (ON
-OFF switch), 13...detection element.

Claims (1)

[Claims for Utility Model Registration] (1) A loop-shaped connection between the heat receiving section installed above and the heat dissipation section installed below, and the condensability of fluorocarbons, methyl alcohol, etc. as a heat transport medium inside. It has a conduit in which an appropriate amount of liquid working fluid is sealed, and first and second check valves are interposed in this conduit to allow the working fluid to flow only from the heat radiating part to the heat receiving part, and In a heat transfer device in which an accumulator is disposed between these two check valves, the temperature and pressure of steam in the heat receiving section and in any part of the pipe line leading from the heat receiving section to the working fluid outlet pipe of the heat dissipating section. A detection element that detects any of the above, a heating source that heats the heat receiving part, and a temperature converted from the temperature and pressure detected by the detection element become below a certain predetermined lower limit temperature, the above-mentioned The heat source increases the amount of heating, and when the temperature reaches the upper limit temperature, which is higher than the lower limit temperature by a certain predetermined temperature range, the heat source at least reduces the amount of heat, and the predetermined temperature range is determined by the predetermined temperature range. and a control device configured such that a pressure difference in the steam that is generated is greater than a pressure difference required to recirculate the working fluid from the heat radiating section to the heat receiving section. transmission device. (2) The heat transfer device according to claim 1, wherein the heating source starts and stops heating by detecting a lower limit temperature and an upper limit temperature. (3) The heating source is a low heating source whose heating capacity is set such that the heating capacity is set so that the temperature after heating is switched to the detection of a temperature higher than the upper limit temperature and the temperature lower than the lower limit temperature, and the detection of a temperature lower than the lower limit temperature. 2. A heat transfer device according to claim 1 or 2, comprising: a high heating source whose heating capacity is set such that the temperature after heating is higher than the upper limit temperature;