JPH02208497A - Two-phase flow cold plate - Google Patents

Abstract

PURPOSE:To prevent the generation of the dry-out of an evaporating surface by a method wherein an evaporating plate, forming an evaporating space by a heat receiving plate and the end face of a flange unit, is formed between both of heat transfer flanges projected from the heat receiving plate while a liquid introducing unit is formed at the opposite side of the evaporating space. CONSTITUTION:Heat transfer flanges 18 are projected from the lower surface of a heat receiving plate 17 with a required space so as to form a plurality of parallel evaporating spaces 16. An evaporating plate 20, consisting of a porous sintered metal, is bonded integrally to the lower end bonding surface 19 of the flanges 18 and, further, a liquid introducing unit 22 is formed below the evaporating plate 20 by a bottom plate 21. Accordingly, liquid, introduced into the evaporating plate 20, is blown off by the heat of the evaporating plate 20 into the evaporating space 16 directly whereby effective heat absorption may be effected. On the other hand, an evaporating surface 23 is neared to the liquid introducing unit 22 by the heat transfer flanges 18 and the evaporating plate 20 whereby the flow resistance of the introduced liquid can be reduced and, therefore, the generation of dry-out of the evaporating surface may be prevented effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a two-phase flow cold plate used for cooling a heat exhaust system of space equipment.

[Prior Art] Conventionally, as shown in Fig. 3, when cooling equipment 2 installed in a spacecraft or space base 1, a two-phase A two-phase flow waste heat loop is formed between the flow cold plate 3 and the heat dissipation condenser 4 in which a heat medium is circulated through the pipe 5.6, and the heat generated by the equipment 2 is absorbed by the two-phase flow cold plate 3. However, it is considered that the heat is released from the heat dissipation condenser 4 into outer space.

Figure 4 shows the conventional two-phase flow cold plate 3.
This is an example of a heat-receiving plate 8 made of a material with good heat transfer properties, which has a heat-receiving surface 7 on the upper surface that receives the heat of the equipment 2 shown in FIG. An evaporation groove 9 is provided, a bottom plate 10 is arranged at a required distance from the back surface of the heat receiving plate 8, a liquid guide wick 11 is provided on the back surface of the heat receiving plate 8, and the liquid guide wick 11 and the bottom plate are provided. A liquid supply plate 12 is disposed between the heat receiving plate 8 and the bottom plate 10, and the liquid supply plate 12 and the liquid guiding wick 11 are sandwiched between the heat receiving plate 8 and the bottom plate 10.

Furthermore, a liquid supply groove 13 is provided on the surface of the liquid supply plate 12 that comes into contact with the liquid guide wick 11, and a vapor discharge channel 14 is provided on the surface that comes into contact with the bottom plate IO.

In the two-phase flow cold plate 3 shown in FIG. 8 is evaporated by the amount of heat Q received from the heat receiving surface 7, flows through the evaporation groove 9 in a direction perpendicular to the paper plane of FIG. 4, and is discharged from the steam exhaust passage 14.

[Problem to be solved by the invention] However, in the above conventional cold plate 3,
The liquid in the liquid supply groove 13 is transferred to the evaporation section 1 via the liquid guide wick 11.
5, the distance for the liquid to be guided to the evaporator 15 is long, increasing flow resistance.Furthermore, since the evaporator 15 is flat, the force to suck the liquid is weak. It becomes difficult to uniformly and stably introduce the liquid to the evaporation section 15, and therefore dryout tends to occur, resulting in a significant decrease in heat absorption efficiency.

The present invention was made by focusing on the above-mentioned conventional problems.
By bringing the liquid guide part and the evaporation surface closer together, the purpose is to prevent dryout and achieve efficient heat absorption.

[Means for Solving the Problems] The present invention includes a heat receiving plate having heat transfer flange portions protruding from one side at required intervals, and a heat receiving plate made of sintered metal and integrally bonded to the end face of the heat transfer flange portion. A two-phase flow cold plate comprising an evaporation plate forming an evaporation space between heat transfer flange parts, and a liquid guiding part formed on the side opposite to the evaporation space of the evaporation plate; an evaporator fin formed in an L-shape from a compact metal, one side of which is adhered integrally and in parallel to one side of the heat receiving plate; and an evaporator fin that is in contact with the end surface of the other side of the evaporator fin The present invention relates to a two-phase flow cold plate characterized by comprising a liquid guide wick forming an evaporation space between them, and a liquid guide part formed on the side opposite to the evaporation space of the liquid guide wick.

[Function] Heat from the heat receiving plate is transmitted to the evaporator plate via the heat transfer flange,
The liquid guided from the liquid guide part to the porous evaporation plate is evaporated so as to be blown directly into the evaporation space from the evaporation surface.

Further, the heat of the heat receiving plate is transmitted to the evaporating fins, and the liquid guided from the liquid guiding portion to the evaporating fins via the liquid guiding wick immediately evaporates from the surface of the evaporating fins facing the evaporation space.

[Implementation example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, which has a heat-receiving surface 7 on the top surface that receives the heat of the equipment 2 shown in FIG. Heat transfer flange portions 18 are integrally provided on the lower surface of the heated heat receiving plate 7 at required intervals so as to form a plurality of parallel evaporation spaces 16, and the lower end of each heat transfer flange portion 18 is provided. An evaporation plate 20 made of porous sintered metal (for example, copper) is integrally bonded to the adhesive surface 19 by diffusion bonding or the like, and a liquid guide portion 22 is further formed on the lower surface of the evaporation plate 20 via a bottom plate 21. By doing so, a blow-out type two-phase flow cold play (3a) is constructed. 23 indicates the evaporation surface.

In the above-mentioned blow-out type two-phase flow cold plate 3a, the amount of heat Q received on the heat receiving surface 7 of the heat receiving plate 17 is transmitted to the integrated heat transfer flange portion 18 with almost no change, and is further integrated by diffusion bonding or the like. evaporation plate 20 via the adhesive surface 19
can be conveyed to.

On the other hand, since the lower surface of the evaporator plate 20 is in direct contact with the liquid in the liquid guide section 22 and has a porous structure made of sintered metal with an excellent liquid guide effect, the evaporator plate 20 is effectively guided to the evaporation space 16 side.

Therefore, the liquid guided into the evaporation plate 20 is evaporated so as to be blown directly into the evaporation space 1c from the upper surface of the evaporation plate 20 due to the heat of the evaporation plate 20. Therefore, effective heat absorption is performed, and the liquid is evaporated. Since the distance for the evaporation is as short as the thickness of the evaporation plate 20, the liquid can be introduced easily and reliably, and the evaporation surface 23 of the evaporation plate 20 can be prevented from drying out.

FIG. 2 shows another embodiment of the present invention, in which one side of an evaporator fin 2B is formed in an L-shape from sintered metal on the lower adhesive surface 25 of a heat-receiving plate 24 having a heat-receiving surface 7 on the upper surface. A plurality of evaporation spaces 16 are formed by bonding a plurality of 2f3a in parallel by diffusion bonding or the like, and placing the liquid guide wick 27 in contact with the lower end of the other side 28b, and furthermore, a bottom plate is attached to the lower surface of the liquid guide wick 27. A fin-shaped two-phase flow cold plate 3b is constructed by forming a liquid guide portion 29 through the fin-shaped two-phase flow cold plate 3b.

In the fin type two-phase flow cold plate 3b, the heat l1kQ received on the heat receiving surface 7 of the heat receiving plate 24 is the evaporation fin 2B which is integrally bonded to the lower adhesive surface 25 of the heat receiving plate 24 by diffusion bonding or the like. It is transmitted to one side 28a of , with almost no change, and is further transmitted to the other side 26b.

On the other hand, since the lower surface of the liquid guide wick 27 is in contact with the liquid in the liquid guide part 29, the liquid is guided to the end of the other side 2Bb of the evaporator fin 2B via the liquid guide wick 27, which further improves the liquid guide effect. It moves well inside the porous evaporation fins 26.

Therefore, the liquid guided into the evaporation fin 2B is evaporated into the evaporation space 16 from both sides of the other side 26b and the lower surface of the side 26a by the heat of the evaporation fin 26, so that effective heat absorption is performed. In addition, since the distance for guiding the liquid is as short as the thickness of the liquid guiding wick 27, the liquid is immediately guided to the evaporation surface 23 of the evaporating fin 26 and moves well inside the evaporating fin 2B. Therefore, the evaporation surface 23
can prevent dry out.

It should be noted that the two-phase flow cold plate of the present invention is not limited to the above-described embodiments, and it goes without saying that various changes may be made without departing from the gist of the present invention.

[Effects of the Invention] As explained above, according to the two-phase flow cold plate of the present invention, the evaporation surface is brought close to the liquid guide part by the heat transfer flange part and the evaporator plate or the evaporator fin, so that the liquid guide part is The evaporation surface has a porous structure made of sintered metal to reduce the flow resistance of the liquid, and the evaporation surface has a porous structure made of sintered metal, which improves the movement of the liquid, effectively preventing the occurrence of dryout on the evaporation surface. It can have a great effect.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of one embodiment of the present invention, Fig. 2 is a sectional view of another embodiment of the invention, and Fig. 3 is a sectional view of a spacecraft or space base in which a two-phase flow cold plate is used. Explanatory diagram, 4th
The figure is a sectional view showing an example of a conventional two-phase flow cold plate. 3a is a blow-out type two-phase flow cold plate, 3b is a fin-type two-phase flow cold plate, 16 is an evaporation space, 1
7 is a heat receiving plate, 18 is a heat transfer flange portion, 19 is an adhesive surface, 2
0 is an evaporation plate, 21 is a bottom plate, 22 is a liquid guiding part, 23 is an evaporation surface, 24 is a heat receiving plate, 25 is an adhesive surface, 2B is an evaporation fin, 2
8a is one side, 26b is the other side, 27 is a liquid guiding wick, 28
29 represents a bottom plate, and 29 represents a liquid guide portion.

Claims (1)

[Scope of Claims] 1) A heat receiving plate having heat transfer flange portions protruding from one side at required intervals, and a heat transfer flange portion made of sintered metal and integrally bonded to the end face of the heat transfer flange portion. A two-phase flow cold plate comprising an evaporation plate that forms an evaporation space between them, and a liquid guide portion formed on the side opposite to the evaporation space of the evaporation plate. 2) A heat receiving plate, an evaporation fin made of sintered metal in an L-shape, one side of which is adhered integrally and in parallel to one side of the heat receiving plate, and an end face of the other side of the evaporation fin. A two-phase flow cold plate comprising: a liquid guide wick that contacts the evaporator fins to form an evaporation space between the evaporation fins; and a liquid guide part formed on the side opposite to the evaporation space of the liquid guide wick.