JPS6037390B2 - heat transfer device - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention utilizes the boiling and condensing action of a liquid to have a thermal valve action that transmits heat above a certain temperature but not below that temperature. This invention relates to a new heat transfer device.

[Background of the invention]

Conventional heat transfer devices that utilize the boiling and condensing action of a liquid only have the function of transmitting heat, so in order to perform a thermal valve action, it is necessary to use a solenoid valve that controls the flow of the heat medium. It was necessary to add some kind of mechanical valve.

In other words, as shown in Fig. 1, the secondary structure includes a heating section 1, a cooling section 2, a connecting pipe 3 through which the heated heat medium passes, a return pipe 4 through which the cooled heat medium returns, and a temperature sensor. 6 and an electromagnetic valve 5 that controls the flow based on a signal from this valve. Although this method can control the flow simply by adding a solenoid valve 5, it has the drawbacks of poor lifespan and reliability due to the mechanically moving parts, and high price due to the complicated structure of the valve. [Object of the Invention] The object of the present invention is to eliminate the drawbacks of the subordinate technology and provide a heat transfer device with a thermal valve action that can control the circulation flow rate separately from the control of the main amount of heat transfer. It is in.

[Summary of the invention]

A feature of the present invention is that a part of the liquid return pipe is a riser pipe, and a heating device is provided in the riser pipe.

[Embodiments of the Invention] The present invention will be explained in detail with reference to Examples below. FIG. 2 shows an embodiment of the invention. The heating section 1 and the cooling section 2 are connected by a connecting pipe 3 and a return pipe 4 to form a circulation loop, forming a closed container. The low boiling point liquid 33 (fluorocarbon, water, alcohol, mercury, etc.) in the heating section 1 is heated and boiled, and the generated vapor or two-phase flow of vapor and liquid passes through the connecting pipe 3 and enters the cooling section 2. , steam condenses and transfers heat by releasing latent heat of vaporization. The liquid 33 passes through the return pipe 4 again and descends. The process up to this point is equivalent to the prior art, and the features of the present invention are as follows. A part of the return pipe 4 is turned upward again to form an inverted U-shaped riser pipe 7,
A liquid storage tank 8 is added between the cooling part 2 and the riser pipe 7, which has an internal volume that can accommodate all the low boiling point liquid 33 sealed inside the closed container. Furthermore, a heating device 10 (an electric heater, a hot air fan, a Vertier element, an electromagnetic heater, etc.) is added to the riser pipe 7 to heat the riser pipe 7 according to the signal from the temperature detector 6. Top 9 and tank 8
The upper parts of the two are connected by a pressure delivery pipe 11. When the heating device 10 is not operating, the liquid level is lower than the top 9 of the riser 7, and the liquid 33 cannot cross the top 9 and enter the heating section 1, so there is no liquid 33 in the heating section 1, and the heating section 1 The heat transfer between the cooling section 2 and the cooling section 2 ceases. In addition, heating device 1
0 is activated to heat the riser pipe 7, the liquid inside the riser pipe 7 boils and bubbles are generated, and the liquid 33 overflows from the top 9 of the riser pipe 7 due to the pump action when the generated bubbles rise. The overflowing liquid 33 passes through the pipe 13 and enters the heating section 1, where it acts to transfer the heat of the heating section 1 to the cooling section 2. By turning on and off the operation of the heating device 10 in this manner, the supply of the liquid 33 to the heating section 1 can be controlled, and the amount of heat transfer can be controlled. According to the experiment, Freon R-114 (filling amount: 70%) is used as the low boiling point liquid 33, the internal volume of the tank 8 is 80cc, the height of the riser pipe 7 is 10mm, the thermistor is used as the temperature detector 6, and the heating device 10 is used. When using an electric heater as an electric heater, it was possible to turn on and off the heat transfer amount of about 80W by turning on and off the heater input of 2W. FIG. 3 shows another embodiment of the present invention, and shows a structure in which the liquid reservoir tank 8 is omitted. The structure of this method is simple and excellent when the inner mirror of the cooling unit 2 can accommodate all the amount of liquid sealed therein. Moreover, it is more effective to connect the pressure conduit 11 to the lower part of the cooler 2 in order to prevent backflow of steam from the pipe 13, and to seal the connection part above the liquid 33 in the cooling part 2. FIG. 4 shows another embodiment of the present invention, in which two riser pipes (7) are used when there are two heating sections (1, 14).
, 16), and shows a structure in which the cooling section 2 can be used commonly for both temperature sensors 6 and 19 based on the signals from the temperature sensors 6 and 19.

Even if there are three or more, the effects of the present invention can be similarly achieved. 5 to 7 show modified embodiments of the connection structure of the liquid reservoir tank 8 and piping.

FIG. 5 shows an example where the liquid reservoir tank 8 is located at a lower position than the heating section 1. FIG. 6 shows an example in which the return pipe 4 is directly connected to the liquid storage tank 8, and a heat insulating material 23 is attached around the heating device 10, and the heater 1
It shows a structure in which the heat generated at 0 is effectively transferred to the liquid 33. FIG. 7 shows the structure when the pressure communication pipe 11 is further extended to the cooling section 2. In the structure shown above, the heating device 10 is attached only to the lower part of the riser pipe 7, and the liquid 33 is necessarily present inside the riser tube 7 to which it is attached. If there is an upper limit or if there is a size restriction, the heating device 10 may be attached to the entire riser pipe 7 as shown in FIG.

FIG. 9 shows that even when the heating device 10 is not working, when the temperature of the cooling section 2 suddenly drops and the pressure of the system decreases, the liquid 33 boils under reduced pressure in the riser pipe 7 and the liquid 33 flows from the top 9 of the riser pipe 7. This is to prevent it from overflowing.

The down pipe 12 from the liquid reservoir tank 8 is lengthened to form the rise pipe 7.
The above-mentioned phenomenon is suppressed so that equivalent bubbles are generated inside the down pipe 12 and balanced. Further, it is preferable to make the heat capacities of the down pipe 12 and the rise pipe 7 small, since the reduced pressure boiling can be completed more quickly. 10th and 1st
Figure 1 shows the structure when the present invention is applied to a refrigerator.

FIG. 10 shows the cross-sectional structure of the refrigerator-freezer. The refrigerator 23 is divided into a freezing compartment 24 and a refrigerating compartment 25, and the freezing compartment 24 is maintained at about 118 qo by a refrigeration cycle consisting of a compressor 29, a condenser 28, and an evaporator 34, and a blower 26. On the other hand, the refrigerator compartment 25 is cooled to a predetermined temperature of about 2° C. by the heat transfer device of the present invention. That is, a heat exchanger 35 corresponding to the heating section 1 is installed in the refrigerator compartment 25, a heat exchanger corresponding to the cooling section 2 is brought into contact with the evaporator 34 on the refrigeration cycle side, and a temperature detection system installed in the refrigerator compartment 25 is installed. The heating device 1 is energized by a signal from the device 6 (thermistor in this case), and the liquid 33 is caused to overflow from the riser pipe 7 by a bubble pump action and is supplied to the heat exchanger 35. Here, cooling section 2
has shown an example in which it is in contact with the evaporator 34, but the cooling method is not limited to this, air cooling may be used, or it may be completely integrated with the evaporator 34 and cooled directly. Any method may be used as long as the pond is cooled. FIG. 11 also shows an embodiment in which the present invention is applied to a refrigerator.
The evaporator 34 is defrosted using the heat of the compressor 29.

When starting defrosting based on the signal from the temperature sensor 19,
The second heating device 18 is energized, which causes bubbles to form in the second riser 16 and cause liquid 33 to rise over the top 17.
falls in the downcomer pipe 21 and reaches the jacket surrounding the compressor 29. Compressor 29 is normally around 45q0, so liquid 33
boils and turns into steam through the riser pipe 15, reaches the cooling section 2, condenses, and transfers heat. Since this second circuit flows only during defrosting, the heat of the compressor 29 does not normally leak. According to this method, a defrosting heater (usually 100 to 15 times) is unnecessary, power consumption can be reduced, and accidents due to abnormal temperature rise of the heater can be prevented, which is desirable from a safety standpoint. [Effects of the Invention] As explained above, according to the present invention, by activating or stopping the heating device installed in the riser, a much larger amount of heat is transferred from the heating section to the cooling section than the amount of heat applied to the heating device. It became possible to start or stop transport, and the reliability and controllability were also significantly improved compared to heat transfer devices using valves.

[Brief explanation of drawings]

Fig. 1 is a structural diagram of a conventional heat transfer device, Figs. 2 to 5 are structural diagrams showing an embodiment of the present invention, and Figs. 6 to 9 are parts of the connection structure of the heat transfer device of the present invention. An enlarged view, FIG. 10 is a sectional view of a refrigerator-freezer using the present invention, and FIG. 11 is a structural explanatory diagram of a refrigerator-freezer that does not require a defrosting heater and uses the present invention. 1... Heating section, 2... Cooling section, 3...
... Connection pipe, 4 ... Return pipe, 5 ... Solenoid valve, 6, 19 ... Temperature detector, 7 ... Rising pipe, 8 ...・Liquid storage tank, 9... Top, 10, 18... Heating device, 11, 20, 22
... Pressure conveyance pipe, 12 ... Down pipe, 13.
...Pipe, 15...Rising pipe, 21...
・・Descending pipe, 23・・・・ Refrigerator, 24・・・・
・Freezer room, 25... Refrigerator room, 26...
Blower, 28... Condenser, 29... Compressor, 30... Pressure reducing device, 33... Liquid, 34... Evaporator, 35 …···Heat exchanger. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11

Claims (1)

[Claims] 1. A closed container in which a heating section and a cooling section located at a higher position than the heating section are connected to form a circulation loop by a connecting pipe through which steam moves and a liquid return pipe. an amount of evaporative liquid that can store the entire amount in liquid form in the cooling part,
Further, a part of the liquid return pipe is formed into an inverted U-shaped riser pipe, and the top of the riser pipe is arranged above the liquid level formed when the entire amount of the evaporative liquid is stored in the cooling section. A heating device is provided in a portion of the riser near the cooling portion, and when the heating device is activated, heat is transferred between the heating portion and the cooling portion, and when the heating device is stopped, heat transport is stopped. Heat transfer device. 2. In a closed container in which a heating section and a cooling section located at a higher position than the heating section are connected to form a circulation loop by a connecting pipe through which steam moves and a liquid return pipe, the liquid return pipe is Part of the riser pipe is shaped like an inverted U,
A liquid reservoir tank is provided in the liquid return pipe section between the riser pipe and the cooling section, and an amount of evaporative liquid that can be stored in the liquid state in the liquid reservoir tank is sealed in this airtight container. The top of the pipe is disposed above the liquid level created when the entire amount of evaporative liquid is stored in the liquid storage tank, a heating device is provided in a portion of the riser near the cooling section, and the heating device is activated. A heat transfer device that allows heat transport between a heating section and a cooling section when the device is turned on, and stops heat transport when the device is turned off.