JPH0440635B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat transfer device, and particularly to a heat transfer device using a pipe-shaped container as a heat transfer element.

[Conventional technology]

A heat pipe transfers heat using latent heat associated with vaporization and liquefaction of a working heat medium.
Because it has extremely high thermal conductivity, it is a heat transfer element that has been widely used in recent years for waste heat recovery and air conditioning in factories, and for cooling electronic components.

Conventional heat pipes have a structure in which the inside of the container is evacuated, a heating medium guide part called a heat medium is installed along the inner wall of the container, and an operating heating medium is sealed in the container, and one end of the container is heated. Then, the working heat transfer medium evaporates and moves to the other end where it becomes colder, where it condenses. The condensed working heat medium moves inside the wick by capillary action, returns to the heating section, and evaporates again, thereby transporting heat from the heating section to the condensing section.

However, conventional heat pipes have limited thermal efficiency, and because the container has a closed structure, the evaporation temperature of the working heat medium is determined primarily by the pressure inside the container and the type of working heat medium. . For this reason, the pressure inside the container is controlled according to the temperature of the heating section,
It is not possible to adjust the evaporation temperature to the optimum value, and especially when there are multiple heating sections, it is not possible to individually adjust the evaporation temperature to the optimum evaporation temperature. There was a risk that a situation would arise where the team could not perform.

Taking the above facts into consideration, the inventors have developed a heat transfer device that can always operate the system in the optimum state by varying the evaporation temperature of the working heat medium, has no design constraints on long-distance heat transfer, and has a long lifespan. For the purpose of achieving this, a heat transfer device was previously proposed in Japanese Patent Application No. 59-68899 (see Japanese Patent Application Laid-Open No. 60-213793), which is the original invention.

In the heat transfer device according to the original invention, one end of the pipe-shaped container is connected to a liquid receiver storing a working heat medium, and an inclined part is provided which is gradually lower than the liquid receiver, thereby increasing the surface area of the heat medium and improving efficiency. The other end of the pipe-like container is equipped with a pressure control valve, and a reflux pipe is connected to the liquid receiver via a condenser, so that a desired pressure can be obtained by operating the pressure control valve.

FIG. 3 shows an embodiment of the heat transfer device according to the original invention, and in FIG. 3, a liquid receiver is used as a reservoir in which refrigerant as a working heat medium is stored in a liquid state up to a predetermined level. A plurality of (two in this embodiment) heat pipes 12 are branched and connected in parallel to the heat pipe 10 . As shown in the figure, the pipe-shaped container constituting each heat pipe 12 is extended from the liquid receiver 10 to a heating section 14 such as an object to be cooled, and then bent and extended to near the condenser 30.

The pipe-shaped container 18 of the heat pipe 12 has a large number of annular ribs 22, which are chevron-shaped protrusions, protruding around the longitudinal axis of the inner wall container 18 to increase the liquid surface by capillary action. Substantially chevron-shaped protrusions can also be formed by cutting similarly shaped grooves into the flat inner wall.

In the vicinity of the connecting portion of the heat pipe 12 to the liquid receiver 10, there is an inclined portion 12A that is gradually lowered from the liquid receiver 10. Therefore, the liquid refrigerant that overflows in the liquid receiver 10 is moved to the inclined part 12A by gravity.
However, as shown in FIG. 4, there are many annular ribs 22 protruding from the inside, so the refrigerant stays in the grooves between these ribs 22 and also passes over the ribs 22 to the next groove. reach. Furthermore, since the refrigerant staying in the groove moves up the wall surface along the groove due to capillary action, the refrigerant has a large surface area and is easily vaporized. Also,
Similarly, the surface area of the refrigerant is large in flat areas,
Easily vaporized. While moving in the direction of arrow A, heating section 1
In step 4, the refrigerant removes heat from the object to be cooled and evaporates. This evaporation may be performed at the inclined portion 12A.
The flat portion of the container 18 other than the inclined portion 12A may be inclined, and any arrangement other than vertical may be sufficient.

Note that the rib 22 is not limited to an annular shape as shown in the drawings, but may be spirally formed or formed in the axial direction of the container 18, and its cross section is not limited to a chevron shape. Furthermore, instead of these ribs 22, they may be fibrous or the like to perform a general capillary action.

A pressure control valve 23 is provided for each heat pipe 12 at the return end of the heat pipe 12, and the outlet side of the pressure control valve 23 is commonly connected to a header 24 as a collector. A pressure detector 27 and an indoor temperature (or humidity) detector 28 are provided for each heat pipe 12 on the pressure control valve 23 side of the heat pipe 12 . Pressure detector 27 and/or room temperature (or humidity) detector 28
By inputting the detection signal into the controller 29 and controlling the opening degree of the pressure control valve 23, it is possible to independently set the pressure inside the container 18 to a desired value for each heat pipe 12.

A condenser 30 is connected to the header 24 via a reflux pipe 25. The condenser 30 consists of a main body 34 having a large number of radiation fins 32, and a fan 36 that sends cold air to the main body 34, and the fan 36 is rotationally driven by a motor 38.

The outlet side of the condenser 30 is again connected to the bottom of the receiver 10 via the reflux pipe 40, so that the receiver 10, the heat pipe 12, and the condenser 30 form a closed loop. The liquid receiver 10
The refrigerant can be easily replenished with leaked refrigerant from a closed injection port (not shown).

A vacuum pump 46 is connected to the middle of the reflux tube 25 via a pipe 42 and a vacuum header 44, and by this operation, the degree of vacuum inside the reflux tube 25 can be maintained at a predetermined value. A solenoid valve 48 is interposed in the middle of the piping 42 to maintain airtightness within the device system. This vacuum pump 46 may be connected near the heating section 14.

Next, the operation of this embodiment will be explained.

First, the motor 38 is rotated and the fan 36 blows cold air to the main body 34 of the condenser 30.
0 is the cooling operation state. The inside of the condenser 30, the reflux pipe 25, and the header 24 become negative pressure, and at the same time, the condensed refrigerant returns to the liquid receiver 10. Next, the pressure control valve 23 is adjusted to maintain the pressure in each container 18 for each heat pipe 12 at a suitable arbitrary constant pressure.

In each heat pipe 12, the liquid refrigerant that overflows in the liquid receiver 10 is moved to the inclined part 12 by gravity.
A flows down to the heating section 14. When the liquid refrigerant that has arrived at the heating unit 14 is heated by an external object to be cooled, it evaporates at a temperature determined by the pressure inside the container 18 and the type of refrigerant. Here, the pressure inside the container 18 is set in advance by adjusting the pressure control valve 23 to a value that allows the refrigerant to evaporate and optimizes the heat transfer efficiency, taking into consideration the temperature of the object to be cooled. When the refrigerant evaporates, it absorbs a large amount of heat of vaporization from the outside and cools the object to be refrigerated. Ribs 22 are provided inside the container 18,
Since the refrigerant has a large surface area and is easily vaporized, it absorbs a large amount of heat. In this embodiment, the pressure control valve 2
3 controls the pressure of the refrigerant in a vaporized state, so that evaporation of the refrigerant in the heating section 14 can be quickly stopped. On the other hand, if the flow rate of the liquid refrigerant is controlled on the upstream side of the heating section 14, even if the flow of the liquid refrigerant is stopped, the remaining refrigerant will evaporate in the heating section 14, so the cooling operation will be stopped quickly. It is not possible.

The refrigerant gas that has become vapor in the heating section 14 is
Flows in the direction shown by from the return portion of the heat pipe 12 through the pressure control valve 23 and into the header 24. After the refrigerant gas sent from each heat pipe 12 is collected in this header 24, it is further transferred to the condenser 30 via the reflux pipe 25. The refrigerant gas that has come to the condenser 30 is condensed and becomes liquid under the cooling effect of the condenser 30, and at this time, the heat of condensation is released to the outside. The released heat is exhausted from the heat radiation fins 32 into the atmosphere.

The refrigerant after condensation passes through the reflux pipe 40 to the liquid receiver 10.
The process returns to , and the above operations are repeated.

As described above, in the original application, a plurality of heat pipes 12 are provided, and each heat pipe 12 is individually equipped with a pressure control valve 23. Therefore, in response to the environmental conditions of a plurality of objects to be cooled, it is possible to efficiently apply a desired cooling effect to each object to be cooled, independently and without mutual influence on each heat pipe 12 by appropriate and simple operations. I can do it.

However, in the original invention, the evaporation pressure of the refrigerant evaporated in the heating section 14 is adjusted by the pressure regulating valve 23.
Although it was possible within a certain range, it was difficult to implement it over a wide range.

[Problem to be solved by the invention]

An object of the present invention is to provide a heat transfer device in which the evaporation pressure of the refrigerant evaporated in the heating section according to the original invention can be adjusted over a wide range.

[Means to solve problems]

This invention attaches a pressure adjustment mechanism to the liquid receiver,
By attaching a check valve to the reflux pipe connected to the liquid receiver, the evaporation pressure of the refrigerant evaporated in the heating section can be adjusted within a wide range.

〔Example〕

FIG. 1 is a system diagram showing one embodiment of the heat transfer device according to the present invention, and FIG. 2 is a system diagram showing another embodiment.

A piston 50 that is inscribed in the upper part of the inside of the liquid receiver 10 shown in FIG.
Nut 5 attached to the upper surface of the interlocking liquid receiver 10
Adjust by rotating 2.

A check valve 53 is attached to the reflux pipe 40, and this check valve 53 prevents the medium from flowing back from the receiver 10 to the condenser 30 when the piston 50 applies pressure to the medium.

FIG. 2 shows another embodiment, in which a gas cylinder 60
It consists of a pipe 61 connected to the pipe 61, a valve 62 and a pressure gauge 63 attached in the middle of the pipe 61. Piping 61
The pressure of the hollow expandable body 64 connected to is set by adjusting the opening degree of the valve 62.

The pressure inside the liquid receiver 10 is set appropriately depending on the position of the piston 50 or the lower end of the hollow elastic body 64 to apply pressure to the medium stored in the liquid receiver 10, and the pressure is applied to the medium stored in the liquid receiver 10. After adjusting the amount of medium sent into the chamber, the operating pressure of the pressure regulating valve 23 is adjusted. Thereby, the evaporation pressure of the medium evaporated in the heating section can be adjusted over a wider range than when the pressure adjustment valve 23 alone is used.

Note that the other configurations and driving directions are the same as those of the original invention.

〔Effect of the invention〕

This invention provides a heat transfer device having a closed circuit connecting a liquid receiver, a heating section, a pressure regulating valve, a condenser, etc., in which a pressure adjustment mechanism is attached to the liquid receiver, and the operating heat from the liquid receiver is transferred to a reflux pipe. Since a check valve is provided to prevent the medium from flowing backward, the pressure of the refrigerant evaporated in the heating section can be easily varied over a wide range.

Additional Relationship This invention is based on the original invention, Patent No. 1539789 (see Japanese Patent Publication No. 1-20358), "Heat Transfer Device" (a liquid receiver storing a working heat medium at one end of the plurality of pipe-shaped containers 18). 10 is connected to the heating section 1 through an inclined section 12A that is gradually lowered from the liquid receiver 10.
A pressure control valve 23 is provided on the opposite side of the pipe-shaped container 18 from the liquid receiver 10, and a condenser 30 is provided between the pressure control valve 23 and the liquid receiver 10. A pressure regulating mechanism 50, 6 is connected to a liquid receiver 10 of a heat transfer device (heat transfer device) which is connected with a return pipe 25, 40 to form a closed loop circuit.
4 is attached and a check valve 53 is attached to the return pipe 40.
This is an additional patent that falls under No. 31 No. 1.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing one embodiment of the heat transfer device according to the present invention, FIG. 2 is a system diagram showing another embodiment,
FIG. 3 is a system diagram of a heat transfer device according to the original invention, and FIG. 4 is an explanatory diagram showing a cross-sectional view of a heat pipe. 10...liquid receiver, 12...heat pipe, 14
... Heating part, 22 ... Rib, 23 ... Pressure control valve, 24 ... Header, 25, 40 ... Circulation pipe, 3
0... Condenser, 50... Piston, 51... Spindle, 53... Check valve, 60... Gas cylinder,
61...Piping, 62...Valve, 63...Pressure gauge, 6
4...Hollow stretchable body.

Claims (1)

[Scope of Claims] 1 A liquid receiver 10 storing a working heat medium is connected to one end of the plurality of pipe-shaped containers 18, and a liquid receiver 10 is connected to the heating part 14 via a gradually lowered slope part 12A. A pressure control valve 23 is provided on the opposite side of the pipe-shaped container 18 from the liquid receiver 10, and the pressure control valve 23 and the liquid receiver 1
A reflux pipe 2 is connected to the reflux pipe 2 via a condenser 30 between the
5, 40 to form a closed loop circuit, the liquid receiver 10 is provided with a pressure adjustment mechanism 50, 64, and the liquid receiver 10 and the condenser 30 are connected to each other to form a closed loop circuit. A heat transfer device characterized in that a check valve 53 is attached to the pipe 40 to prevent the working heat medium stored in the liquid receiver 10 from flowing back into the condenser 30.