JPS6338638B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a heat transfer device used, for example, in an air conditioner.

[Prior art]

Heat transfer devices generally enclose a heat transport medium in a pipe and utilize the phase change of this heat transport medium between liquid and steam, and the heat absorbed in the heat receiving part is transported to the heat radiating part and radiated. I try to let them do it. Figure 1 is a system diagram of a conventional heat transfer device, with a heat receiving section 1 arranged horizontally above and a heat dissipating section 2 arranged vertically below.
A pipe line 3 connects them in a loop. First and second check valves 4A and 4B that allow flow in only one direction are provided in series in the middle of this pipe line 3, and an accumulator 5 is arranged between these two check valves 4A and 4B. It is set up. That is,
3A is a pipe line between the heat receiving part 1 and the heat radiation part 2, 3B is a pipe line between the heat radiation part 2 and the first check valve 4A, and 3C is a pipe line between the heat receiving part 1 and the heat radiation part 2;
3D is a pipe line between the first check valve 4A and the second check valve 4B, and 3D is a pipe line between the second check valve 4B and the heat receiving part 1. The pipe is a loop,
A so-called closed pipeline is formed, and an accumulator 5 is connected to the pipeline 3C. An appropriate amount of working fluid 6 such as fluorocarbon or methyl alcohol as a heat transport medium is sealed in the pipe line including this accumulator 5, and the first and second check valves 4A and 4B cooperate to operate the heat dissipation section. If the working fluid 6 from 2 is made to flow only towards the heat receiving part 1, and here the liquid working fluid 6 is liquid 6A and the gaseous working fluid 6 is vapor 6B, the accumulator 5 The other pipe lines 3 are filled with liquid 6A. Incidentally, the inlet/outlet pipe 7 of the accumulator 5 is provided so as to open at the lower part of the accumulator 5, and is configured so that the liquid in the accumulator 5 is discharged before the vapor.

Now, when heat is supplied to the heat receiving part 1, the liquid 6A in the heat receiving part 1 turns into high pressure steam corresponding to the given temperature, and there is a pressure difference between the heat receiving part 1 and the accumulator 5. occurs, and the pressure in the heat receiving part 1 is higher than that in the heat receiving part 1. Therefore, the liquid 6A in the pipe 3A, the heat radiating part 2, and the pipe 3B flows into the accumulator 5 through the first check valve 4A, and the pressure in the accumulator 5 increases. gradually increase.

Then, the steam 6B generated in the heat receiving part 1 reaches the heat radiating part 2, where it is cooled, releases the heat of condensation, and is liquefied, so this is regulated by the temperature of the heat receiving part and the temperature of the heat radiating part, and as a result, Heat receiving part 1, pipe line 3
A. The pressure of the steam 6B in the heat radiating section 2 is a saturated vapor pressure corresponding to a temperature approximately intermediate between the temperature of the heat receiving section and the temperature of the heat radiating section, and therefore the liquid 6A is evaporated in the heat receiving section 1. During this time, the pressure of the accumulator 5 is also maintained at approximately this pressure.

In this state, the steam 6B 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 are no more 6A left in 1. When all of the liquid 6A in the heat receiving part 1 evaporates, the pressure of the steam 6B in the heat receiving part 1, the pipe line 3A, and the heat radiating part 2 is regulated only by the temperature of the heat radiating part 2, and becomes low. 1 and the pressure in the accumulator 5 is higher, the liquid 6A stored in the accumulator 5 will flow back to the heat receiving part 1 through the second check valve 4B. .

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

By the way, when this heat transfer device is used in various devices, it may be necessary to connect the inlet/outlet pipe 7 to the upper part of the accumulator 5 depending on the installation position of the accumulator 5 or the convenience of piping. However, in this case, in the conventional heat transfer device of this type, a pressure difference occurs between the pressure in the heat receiving section 1 and the pressure in the accumulator 5, and when the liquid 6A is discharged from the accumulator 5 to the heat receiving section 1, the inside of the accumulator 5 is Since the steam 6B is discharged from the accumulator 5 at the same time as or before the liquid 6A, the time required for the prescribed liquid 6A to reflux becomes longer, resulting in a problem that the heat transport efficiency decreases.

[Summary of the invention]

The present invention was developed in view of the above circumstances, and includes an accumulator that is provided in a conduit that connects a heat receiving part and a heat radiating part in a loop and has a heat transport medium sealed inside. The very simple structure of providing a capillary tube or porous material as a separation prevention means to prevent the heat transport medium from separating into a gas phase and a liquid phase allows for high transport efficiency even when the inlet/outlet pipe is connected to the upper part of the accumulator. It is an object of the present invention to provide a heat transfer device that can prevent a decrease in heat efficiency. Hereinafter, its configuration and the like will be explained in detail with reference to embodiments shown in the drawings.

[Embodiments of the invention]

FIG. 2 is a schematic diagram showing the main parts of the heat transfer device according to the present invention, in which 5 is an accumulator;
is an inlet/outlet pipe connected to the upper part of the accumulator 5, unlike the conventional one. As shown in FIG. 1, this inlet/outlet pipe 7 is a pipe line 3 connected in a loop between the heat receiving part 1 and the heat radiating part 2, and has a first check valve 4A and a second check valve 4A. It is connected to the pipe line 3C between the valve 4B and the valve 4B.

Reference numeral 11 designates a capillary tube as a separation prevention means for preventing the working fluid 6 sealed in the accumulator 5 and the pipe line 3 from separating into a gas phase and a liquid phase. Entry/exit pipe 7
It is formed to have a smaller diameter and a longer length, and one end is connected to the inlet/outlet pipe 7, and the other end is opened near the lower part of the accumulator 5. It is provided in the accumulator 5 by meandering in a wave shape. In other words, the capillary tube 11 is provided in a meandering state to obtain a long length.

In the heat transfer device configured in this way,
As in the conventional system, the vapor 6B that absorbs heat and evaporates in the heat receiving part 1 is liquefied in the heat radiating part 2, so that the heat from the heat receiving part 1 is transported to the heat radiating part 2 without using any power. can do.

Further, a pressure difference is generated between the heat receiving part 1 and the accumulator 5, and the liquid 6A in the pipe 3A, the heat radiating part 2, and the pipe 3B or the liquid 6A liquefied in the heat radiating part 2 is
When the liquid 6A flows into the accumulator 5 from the upper inlet/outlet pipe 7 through the check valve 4A, the capillary action of the capillary tube 11 can prevent the liquid 6A from falling to the bottom of the accumulator 5. Furthermore, this capillary tube 11 can condense the vapor 6B by capillary condensation. In other words, the vapor pressure is proportional to the radius of the curved surface of the surface in contact with the vapor, and when the radius of curvature is small, the vapor pressure is also small, and condensation at the same pressure can occur even at higher temperatures. As a result, the curved surface portion of the capillary tube 11 draws in the steam 6B, causing condensation.

Therefore, it is possible to prevent the working fluid 6 introduced into the accumulator 5 from separating into the liquid 6A in the liquid phase and the vapor 6B in the gas phase. Therefore, when the pressure in the heat receiving section 1 is lower than that in the accumulator 5 and the working fluid 6 in the accumulator 5 is discharged to the heat receiving section 1, the steam 6B is discharged from the accumulator 5 simultaneously with the liquid 6A or first. can be prevented from being discharged. As a result, it is possible to shorten the time required for the predetermined liquid 6A to reflux, improve the heat transport efficiency, and prevent the heat transport efficiency from decreasing. Furthermore, since the working fluid 6 is prevented from being separated into a liquid phase and a gas phase due to capillary action, separation can be prevented and heat can be transported even in zero gravity.

3 and 4 are schematic diagrams of main parts showing other embodiments, and in these figures, members that are the same as or equivalent to those shown in FIG. 2 are given the same reference numerals.
The explanation will be omitted. In the example shown in FIG. 3, a large number of capillary tubes 12 formed in a straight line and open at both ends are used as separation prevention means. These capillary tubes 12 have a length corresponding to the internal height of the accumulator 5, and are arranged vertically and in parallel with each other.

In the example shown in FIG. 4, a porous material 13 is filled as a separation means. As the porous material 13, a material having a large number of pores or voids such as a resin material used for filters, ceramics, etc. can be used.

Even in the heat transfer device configured in this way,
Since the working fluid 6 can be condensed by the pores and voids of the capillary tube 12 and the porous material 13, separation of the working fluid 6 is prevented, and the amount of water required for the predetermined liquid 6A in the accumulator 5 to reflux is reduced. It can save time.

As described above, the present invention is intended to prevent the working fluid 6 in the accumulator 5 from separating by using a capillary tube or a porous material, so it is limited to the heat transfer device described in the above embodiment. Of course, the present invention is not limited to the present invention, and can also be implemented in other types of heat transfer devices having an accumulator.

〔Effect of the invention〕

As explained above, according to the present invention, a separation prevention device that prevents the heat transport medium from separating into a gas phase and a liquid phase is provided inside the accumulator provided in the pipe line in which the heat transport medium is sealed. Since a capillary tube or a porous material is provided as a means, separation of the heat transport medium within the accumulator can be prevented.

Therefore, it is possible to prevent the vapor of the working fluid from being discharged from the accumulator and shorten the time required for a given heat transport medium to circulate, even if the inlet/outlet pipe is connected to the upper part of the accumulator. This has the effect of preventing a decrease in heat transport efficiency.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a conventional heat transfer device, FIG. 2 is a schematic diagram showing the main parts of the heat transfer device according to the present invention, and FIGS. 3 and 4 are schematic diagrams showing the main parts of other embodiments. It is a diagram. 1...Heat receiving part, 2...Heat radiating part, 3...Pipe line, 4
A, 4B...first and second check valves, 5...accumulator, 7...in/out pipe, 11...capillary tube,
12... Capillary tube, 13... Porous material.

Claims (1)

[Scope of Claims] 1. The heat receiving part and the heat radiating part are connected in a loop shape, and there is a conduit in which an appropriate amount of heat transport medium is sealed, and only the part directed from the heat radiating part to the heat receiving part is provided in the conduit. In a configuration in which first and second check valves are interposed to allow a heat transport medium to flow, and an accumulator is disposed between these check valves, the heat transport medium is in a gas phase inside the accumulator. 1. A heat transfer device comprising a separation prevention means for preventing separation into a liquid phase and a liquid phase. 2. The heat transfer device according to claim 1, wherein the separation prevention means is constituted by a small-diameter capillary tube connected to the pipe line. 3. The heat transfer device according to claim 1, wherein the separation prevention means is composed of a large number of capillary tubes arranged in parallel. 4. The heat transfer device according to claim 1, wherein the separation prevention means is made of a filled porous material.