JP6213807B2 - heat pipe - Google Patents

Description

  The present invention relates to a flat plate-type heat pipe.

  Various plate heat pipes have been disclosed. For example, Patent Document 1 discloses a plurality of capillary plate material grooves that form a flow path through which a liquid-phase refrigerant can be circulated by capillary force, and a gas-phase flow path that circulates an evaporated gas-phase refrigerant. The heat spreader of the structure which made it communicate with the groove | channel of the some gaseous-phase board | plate material which comprises a part by opening is described.

  Patent Document 2 describes a heat transport unit in which a refrigerant reflux space is formed on each of the upper and lower surfaces of the heat transport unit, and a vapor diffusion space is formed between the coolant reflux spaces formed on the upper and lower surfaces. ing.

  Patent Document 3 describes a heat pipe in which a plurality of flat plate-like members are stacked to form a refrigerant circulation passage and a manufacturing operation can be easily performed.

International Publication No. 2009/037928 JP 2011-145044 Japanese Patent No. 4112602

  In recent years, there has been a demand for heat pipes with higher heat transport capability. For example, in recent years, elements having a high calorific value have been used in electronic devices and the like, and it is preferable to use a heat pipe having a higher heat transport capability in order to cool the element.

  This invention is made | formed in view of the above, Comprising: It aims at providing the heat pipe with high heat transport capability.

  In order to solve the above-described problems and achieve the object, a heat pipe according to the present invention is a flat plate-type heat pipe, and a pair of surface layer portions constituting a sealed container having a hollow structure; A liquid phase portion and a gas phase, each of which includes a plurality of internal structure forming portions disposed in the container and a refrigerant sealed in the container, and extends in the container along the longitudinal direction of the internal structure forming portion. The gas phase section has a refrigerant vapor flow path configured with a space in which the vapor of the refrigerant can move along the longitudinal direction, and the internal structure forming section is The liquid phase part is connected by a connecting part provided between each of the pair of surface layer parts, and the liquid phase part is connected to the refrigerant by the connecting part and the internal structure forming part. The liquid of the refrigerant and the liquid of the refrigerant It has a groove-like refrigerant liquid holding region formed so as to be movable along the direction, and the connecting portion has a first refrigerant liquid communication path that communicates between adjacent refrigerant liquid holding regions. Do

  Further, in the heat pipe according to the present invention, in the above invention, the internal structure forming portion communicates between the first refrigerant liquid connecting passages spaced apart via the internal structure forming portion. It is characterized by having.

  Moreover, the heat pipe according to the present invention is characterized in that, in the above-mentioned invention, the internal structure forming portion has a refrigerant vapor communication path for communicating the refrigerant vapor flow channels spaced apart via the internal structure forming portion. And

  Moreover, the heat pipe according to the present invention is characterized in that, in the above-mentioned invention, the internal structure forming portion has a recess formed along the longitudinal direction of the internal structure forming portion and communicating with the refrigerant vapor flow path. And

  Moreover, the heat pipe which concerns on this invention has a connection part which connects the said internal structure formation part adjacent to each other in the said invention, It is characterized by the above-mentioned.

  The heat pipe according to the present invention is characterized in that, in the above invention, the thickness of the connecting portion is thinner than the thickness of the internal structure forming portion.

  The heat pipe according to the present invention is a flat plate-type heat pipe, and a pair of surface layer portions constituting a sealed container having a hollow structure, and a plurality of internal structure forming parts arranged in the container And a refrigerant sealed in the container, and a plurality of liquid phase parts constituted by the internal structure forming part in the container, and a vapor of the refrigerant in a region other than the liquid phase part A gas phase part constituted by a space that can move, and the internal structure forming part is a connection part provided between each of the pair of surface layer parts in the liquid phase part The liquid phase part is formed by the connection part and the internal structure forming part so that the liquid of the refrigerant is held and the liquid of the refrigerant can move along the internal structure forming part. The groove-shaped refrigerant liquid holding area And, wherein the connecting portion includes a first refrigerant liquid communication path for communicating between the refrigerant liquid retention region adjacent the gas phase is characterized in that in communication by the refrigerant vapor communication path.

  Further, in the heat pipe according to the present invention, in the above invention, the internal structure forming portion communicates between the first refrigerant liquid connecting passages spaced apart via the internal structure forming portion. It is characterized by having.

  Moreover, the heat pipe according to the present invention is characterized in that, in the above invention, the connecting portion has a third refrigerant liquid communication path that communicates the plurality of first refrigerant liquid communication paths.

  The heat pipe according to the present invention is characterized in that, in the above invention, a groove is formed on at least one inner surface of the pair of surface layer portions in the gas phase portion.

  Moreover, the heat pipe according to the present invention is characterized in that, in the above invention, the heat pipe has a convex portion formed on at least one inner surface of the pair of surface layer members in the gas phase portion.

  Moreover, the heat pipe according to the present invention is characterized in that, in the above invention, the convex portion is formed along a longitudinal direction of the internal structure forming portion.

  According to the present invention, it is possible to realize a heat pipe having a high heat transport capability.

FIG. 1 is a schematic cross-sectional exploded perspective view of a heat pipe according to Embodiment 1. FIG. FIG. 2 is a cross-sectional view of the main part taken along the line AA of the heat pipe shown in FIG. 1 cut along a plane along the first refrigerant liquid communication path. FIG. 3 is a cross-sectional view of the main part of the BB line obtained by cutting the heat pipe shown in FIG. 1 along a surface along the refrigerant vapor communication path. FIG. 4 is a diagram for explaining how the refrigerant vapor spreads. FIG. 5 is a cross-sectional view of main parts of a heat pipe according to a modification of the first embodiment. FIG. 6 is a cross-sectional view of a main part of a heat pipe according to a further modification of the first embodiment. FIG. 7 is a schematic cross-sectional exploded perspective view of a heat pipe according to the second embodiment. FIG. 8 is a diagram illustrating an example of internal members connected by a connecting portion. FIG. 9 is a diagram illustrating an example of a heat pipe using internal members connected by a connecting portion. FIG. 10 is a schematic perspective view showing a part of the configuration of the heat pipe according to the third embodiment. FIG. 11 is a schematic perspective view of the surface layer member shown in FIG. FIG. 12 is a schematic perspective view of the internal member shown in FIG. FIG. 13 is a cross-sectional view of the main part of the heat pipe taken along the line CC in FIG. FIG. 14 is a cross-sectional view of the main part of the heat pipe taken along the line D-D in FIG. 10. FIG. 15 is a plan view of a principal part when the configuration shown in FIG. 11 is viewed from the internal member side. FIG. 16 is a diagram illustrating a configuration in which the connection portion includes a third refrigerant liquid communication path.

  Embodiments of a heat pipe according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. Moreover, in each drawing, the same code | symbol is attached | subjected suitably to the same or corresponding element. Furthermore, it should be noted that the drawings are schematic, and dimensional relationships between elements may differ from actual ones. Even between the drawings, there are cases in which portions having different dimensional relationships and ratios are included.

(Embodiment 1)
FIG. 1 is a schematic cross-sectional exploded perspective view of a heat pipe according to Embodiment 1 of the present invention. As shown in FIG. 1, the heat pipe 10 is a flat plate-type heat pipe, which forms a sealed container having a hollow structure, a pair of surface layer members 1 and 2 constituting a surface layer portion, and a container A plurality of internal members 3 constituting an internal structure forming portion, which are arranged substantially in parallel along the longitudinal direction (the direction of the arrow Ar1), and a refrigerant sealed in the container. The internal member 3 has a communication path 3a as a second refrigerant liquid communication path and a communication path 3b as a refrigerant vapor communication path. FIG. 2 is a cross-sectional view of an essential part of the AA line obtained by cutting the heat pipe 10 along a surface along the communication path 3a. FIG. 3 is a cross-sectional view of the main part of the BB line obtained by cutting the heat pipe 10 along a surface along the communication path 3b.

  The surface layer members 1 and 2 and the internal member 3 are made of a metal such as aluminum or copper, but are not particularly limited as long as the material can be used for the heat pipe. The surface layer members 1 and 2 and the internal member 3 are metal bonded to each other, for example, by diffusion bonding, but the bonding method is not limited to this. Moreover, if a refrigerant | coolant can be used as a refrigerant | coolant of heat pipes, such as water and a substitute Freon, it will not specifically limit.

  Convex portions 1a and 2a extending along the longitudinal direction of the internal member 3 and surface portions 1b and 2b between the convex portions 1a and 2a are formed on the inner surface inside the container of the surface layer members 1 and 2. Has been. Further, a communication path 2c formed so as to divide the convex portion 2a is formed in the convex portion 2a. A similar communication path is also formed in the convex portion 1a. In addition, a connecting path is good also as a through-hole, without dividing the convex parts 1a and 2a.

  In the heat pipe 10, liquid phase portions 11 and gas phase portions 12 extending along the longitudinal direction of the internal member 3 are alternately arranged in the container.

  The internal member 3 is connected to the surface layer members 1 and 2 at the liquid phase portion 11 by convex portions 1a and 2a as connecting portions.

  The liquid phase portion 11 has a groove-like refrigerant liquid holding region 11a having a U-shaped cross section. The refrigerant liquid holding region 11a is formed by the projecting portions 1a and 2a as the connecting portions and the internal member 3, holds the refrigerant liquid L (see FIG. 3), and the refrigerant liquid L is in the longitudinal direction of the internal member 3. It is comprised so that it can move along.

  The gas phase section 12 has a refrigerant vapor flow path 12a configured with a space extending along the longitudinal direction of the internal member 3 so that the vapor of the refrigerant can move along the longitudinal direction.

  Further, in the gas phase portion 12, the convex portions 1a and 2a form a refrigerant liquid holding region 12b that holds the refrigerant liquid L (see FIG. 3).

  The communication path 2c functions as a first refrigerant liquid communication path that communicates with the adjacent refrigerant liquid holding area 11a in the liquid phase section 11, and communicates with the first refrigerant liquid that communicates with the adjacent refrigerant liquid holding area 12b in the gas phase section 12. Functions as a road.

Further, the communicating絡路2 c of the surface layer member 1 side, and the communication絡路2 c of the surface layer member 2 are spaced over the inner member 3. Communication path 3a functions as a second refrigerant fluid communication path for communicating between these communication絡路2 c which are spaced apart via the inner member 3. Refrigerant liquid can travel between communicating絡路2 c via the communication path 3a as indicated by the arrow Ar2 in FIG.

  In addition, the communication path 3 b functions as a refrigerant vapor communication path that connects the refrigerant vapor flow paths 12 a that are separated via the internal member 3. As shown by the arrow Ar3 in FIG. 3, the refrigerant vapor can go back and forth between the refrigerant vapor flow paths 12a via the communication path 3b.

  The internal member 3 has a recess 3 c formed along the longitudinal direction of the internal member 3. The recess 3c has an inner space communicating with the refrigerant vapor flow path 12a, whereby the cross-sectional area of the refrigerant vapor flow path is larger than the cross-sectional area of the refrigerant vapor flow path 12a.

  In heat pipe 10 according to the first embodiment, when surface layer member 1 or 2 is brought into contact with a body to be cooled (for example, a heating element) (the contact portion at this time is a heat receiving portion), the refrigerant liquid is received at the heat receiving portion. It takes heat and evaporates, and the refrigerant vapor moves through the refrigerant vapor passage 12a of the gas phase section 12 to transport heat. When the refrigerant vapor reaches a region below a predetermined temperature, it is condensed and liquefied to become a refrigerant liquid. The refrigerant liquid returns to the heat receiving part through the refrigerant liquid holding region 11 a of the liquid phase part 11. In this way, the refrigerant recirculates.

  In the heat pipe 10, since the liquid phase portions 11 and the gas phase portions 12 are alternately arranged, the flow of the refrigerant liquid and the flow of the refrigerant vapor can be separated and can be formed in a loop shape. Moreover, since the refrigerant | coolant vapor flow path 12a of the gaseous-phase part 12 is formed of the container comprised by the surface layer members 1 and 2, a wide space can be ensured and the pressure loss accompanying the flow of a refrigerant | coolant vapor | steam is reduced. Moreover, since the cross-sectional area of the flow path of the refrigerant vapor is larger than the cross-sectional area of the refrigerant vapor flow path 12a by the recess 3c of the internal member 3, the pressure loss caused by the flow of the refrigerant vapor is further reduced. Further, in the gas phase part 12, since the convex part 2a forms the refrigerant liquid holding region 12b, the refrigerant liquid can be spread to the surface of the gas phase part 12, and the heat transfer performance accompanying evaporation and condensation can be improved. It can be made even larger.

  Further, in the liquid phase portion 11, the groove-like refrigerant liquid holding region 11a can obtain a sufficient capillary amount (refluxing force) and can increase the surface area of the gas-liquid interface. The accompanying heat transfer performance can be increased. Further, since the refrigerant liquid holding region 11a communicates with the communication paths 2c and 3a having a relatively small channel cross-sectional area, a large capillary force can be obtained, and the refrigerant liquid on the surface layer member 1 side can be obtained. The refrigerant liquid can be efficiently exchanged between the holding area 11a and the refrigerant liquid holding area 11a on the surface layer member 2 side. In the heat pipe 10, due to these synergistic effects, larger heat transport can be achieved than in the conventional case, and the thermal resistance can also be reduced.

  In the heat pipe 10, the liquid phase portions 11 and the gas phase portions 12 are alternately arranged, and in the liquid phase portion 11, the internal member 3 exists between the surface layer members 1 and 2. The mechanical strength against the internal pressure or the external pressure accompanying the temperature change of the refrigerant is strong. As a result, the heat pipe 10 is advantageous in terms of strength as compared to the case where the flat plate members are simply laminated, and is prevented from being easily deformed even when subjected to an external force. Furthermore, the heat pipe 10 does not lose its function even if it is bent with an appropriate curvature, and the shape can be changed relatively freely according to various applications.

  Further, in this heat pipe 10, since the communication path 3b communicates the separated refrigerant vapor flow path 12a, for example, even when the amount of heat received at the heat receiving portion varies depending on the location, the refrigerant vapor is transferred to other refrigerant vapor flows. It can be spread across the road 12a. As a result, the refrigerant vapor channel 12a can be used efficiently as a whole, and the heat dissipation efficiency is improved.

  FIG. 4 is a diagram for explaining how the refrigerant vapor spreads. For example, it is assumed that a heat spot H having a particularly high temperature exists at the position of the specific gas phase portion 12 of the heat pipe 10. At this time, the refrigerant vapor moves in the gas phase portion 12 where the heat spot H exists as indicated by the arrow Ar4, and as indicated by the arrows Ar5 and Ar6, the refrigerant vapor adjacent to the gas phase portion 12 through the communication path 3b, or even not. It also spreads and moves to the illustrated gas phase section 12. Thereby, even if, for example, the amount of heat exceeding the heat transport capability of one gas phase portion 12 is received, the amount of heat can be effectively transported using the plurality of gas phase portions 12, so that the amount of heat that can be transported (coolable) The upper limit of becomes higher.

  As described above, the heat pipe 10 according to the first embodiment has a high heat transport capability.

  FIG. 5 is a cross-sectional view of main parts of a heat pipe according to a modification of the first embodiment. The heat pipe 10 ′ according to this modification has the same configuration as the heat pipe 10 according to the first embodiment. FIG. 5 is a view corresponding to the cross-sectional view of the main part of the heat pipe 10 shown in FIG. In the heat pipe 10 ', the surface layer portion is composed of surface layer members 1' and 2 ', and the internal structure forming portion is composed of internal members 3'a, 3'b and 3'c. Of the elements corresponding to the convex portions 1a and 1b of the heat pipe 10, the convex portions 3'a1 and 3'c1 as connecting portions are included in the internal members 3'a and 3'c, respectively. The elements corresponding to the convex portions 1a and 2a formed in the gas phase portion 12 are convex portions 1'a and 2'a formed on the surface layer members 1 'and 2'. As described above, the surface layer portion, the internal structure forming portion, and the connection portion may be configured by the surface layer members 1 and 2 and the internal member 3 as in the case of the heat pipe 10, or as in the heat pipe 10 '. The surface layer members 1 'and 2' and the inner members 3'a, 3'b, and 3'c may be configured, or may be other configurations, and are not particularly limited. The same applies to the following embodiments.

  In addition, the heat pipe which concerns on this invention does not need to be vertically symmetrical, and can change a shape according to a use. FIG. 6 is a cross-sectional view of a main part of a heat pipe 10D according to a further modification of the first embodiment. The heat pipe 10D is obtained by replacing the surface layer member 1 and the internal member 3 of the heat pipe 10 with a surface layer member 1D and an internal member 3D, respectively. The surface layer member 1D has a convex portion 1Da and a surface portion 1Db. The internal member 3D has a communication path 3Da.

  For example, when it is clear that the heat receiving surface is only on the lower surface (surface layer member 2) side, as shown in FIG. 6, the refrigerant liquid holding region 11a on the upper surface (surface layer member 1D) side and the convex As a structure that eliminates the portion 1a, the cross-sectional area of the refrigerant vapor channel 12a may be increased, and the refrigerant liquid on the upper surface side may be easily returned to the lower surface side.

(Embodiment 2)
FIG. 7 is a schematic cross-sectional exploded perspective view of a heat pipe according to the second embodiment. As shown in FIG. 7, the heat pipe 10 </ b> A is a flat plate-type heat pipe, and forms a sealed container having a hollow structure. A plurality of internal members 3 </ b> A constituting an internal structure forming portion, which are arranged substantially in parallel along the longitudinal direction, and a refrigerant sealed in a container are provided. The internal member 3A has a communication path 3Aa as a second refrigerant liquid communication path and a communication path 3Ab as a refrigerant vapor communication path.

  In the heat pipe 10A, the liquid phase portions 11A and the gas phase portions 12A extending along the longitudinal direction of the internal member 3A are alternately arranged in the container.

  Convex portions 1Aa and 2Aa extending along the longitudinal direction of the internal member 3A and surface portions 1Ab and 2Ab between the convex portions 1Aa and 2Aa are formed inside the container of the surface layer members 1A and 2A. . The internal member 3A is connected to the surface layer members 1A and 2A by the convex portions 1Aa and 2Aa as connecting portions in the liquid phase portion 11A. Further, a communication path 2Ac formed so as to divide the convex part and a communication path 2Aa1 as a third refrigerant liquid communication path formed along the longitudinal direction of the convex part 2Aa are formed in the convex part 2Aa. ing. A similar communication path is also formed in the convex portion 1Aa.

  In the liquid phase portion 11A, a groove-like refrigerant liquid holding region 11Aa is formed by the convex portions 1Aa and 2Aa as the connecting portions and the internal member 3A. In addition, although FIG. 6 is an exploded view, in the heat pipe 10A in the raised state, the convex portions 1Aa, 2Aa and the internal member 3A are joined to form the refrigerant liquid holding region 11Aa. The refrigerant liquid holding region 11Aa is configured to hold the refrigerant liquid and to move the refrigerant liquid along the longitudinal direction of the internal member 3A.

  The gas phase portion 12A has a refrigerant vapor flow path 12Aa that extends in the longitudinal direction of the internal member 3A and is configured by a space in which the vapor of the refrigerant can move along the longitudinal direction. The communication path 3Ab functions as a refrigerant vapor communication path that connects the refrigerant vapor flow paths 12Aa that are separated via the internal member 3A.

  The communication paths 1Aa1 and 2Aa1 as the third refrigerant liquid communication paths communicate between a plurality of communication paths (for example, the communication paths 2Ac) as the first refrigerant liquid communication paths. Accordingly, the refrigerant liquid can be exchanged between the refrigerant liquid holding regions 11a more efficiently, and the liquid passage in the longitudinal direction of the liquid phase portion 11 is secured, so that the liquid flow rate can be increased. It is possible to prevent a decrease in heat transport limit due to liquid circulation. Note that a plurality of communication paths 1Aa1 and 2Aa1 may be formed for one internal member 3A according to the required heat transport amount.

  Further, grooves (for example, grooves 2Ab1) are formed in the surface portions 1Ab and 2Ab of the surface layer members 1A and 2A. Since this groove | channel can hold | maintain a refrigerant | coolant liquid, it becomes possible to spread a refrigerant | coolant liquid to the surface of the gaseous-phase part 12A, and can further enlarge the heat transfer performance accompanying evaporation and condensation.

  In the first and second embodiments, the inner members 3 and 3A are separated from each other, but a plurality of inner members may be connected by a connecting portion.

  FIG. 8 is a diagram illustrating an example of internal members connected by a connecting portion. FIG. 8 is a view of the internal member 3 </ b> B viewed from a direction perpendicular to the longitudinal direction, and a part of the internal member 3 </ b> B is connected by the connecting portion 4. When the internal members 3B are connected in this way, the positional relationship between the internal members 3B is kept constant. For this reason, when the internal member 3B is joined to the surface layer member, the positional displacement of the internal member 3B is less likely to occur, so that the assembly work of the heat pipe is easy and highly accurate.

  FIG. 9 is a diagram illustrating an example of a heat pipe 10 </ b> B using the internal member 3 </ b> B connected by the connecting portion 4. The connecting portion 4 is formed so as not to interfere with the convex portions 1 a and 2 a of the surface layer members 1 and 2. Further, since the thickness of the connecting portion 4 in the vertical direction on the paper surface is thinner than the thickness of the internal member 3B, the cross-sectional area of the refrigerant vapor channel 12Ba is suppressed from being narrowed.

  In addition, although the connection part 4 has connected the two internal members 3B, you may connect several internal members 3B.

  In the first and second embodiments, the gas phase portions and the liquid phase portions are alternately arranged substantially in parallel with each other. However, the gas phase portions and the liquid phase portions may not be in parallel with each other. For example, by arranging the gas phase portion and the liquid phase portion radially, it is needless to say that the shape can be appropriately changed according to the application, such as diffusing heat radially from a specific heat spot.

(Embodiment 3)
FIG. 10 is a schematic perspective view showing a part of the configuration of the heat pipe according to Embodiment 3 of the present invention. FIG. 10 shows a surface layer member 1C constituting the surface layer portion and a plurality of internal members 3C constituting the internal structure forming portion arranged adjacent to the surface layer member 1C. The internal member 3C has an extending portion 3Cc and is connected to each other by the extending portion 3Cc.

  A heat pipe 10C according to the third embodiment includes a configuration including the surface layer member 1C and the plurality of internal members 3C illustrated in FIG. 10, and a surface layer member 2 and a plurality of internal components having the same configuration as the surface layer member 1C. The configuration including the member 3C is configured by joining the internal members 3C to each other. Accordingly, the heat pipe 10C is a flat plate-type heat pipe and is configured as a sealed container having a hollow structure, and the plurality of internal members 3C are arranged in the container. In addition, a refrigerant is sealed in the container.

  The configuration of the heat pipe 10C will be specifically described with reference to FIGS. FIG. 11 is a schematic perspective view of the surface layer member 1C. FIG. 12 is a schematic perspective view of the internal member 3C. FIG. 13 is a cross-sectional view of a main part of the heat pipe 10C in the cross section taken along the line CC in FIG. FIG. 14 is a cross-sectional view of a main part of the heat pipe 10C in the cross section along the line DD in FIG. FIG. 15 is a plan view of a principal part when the configuration shown in FIG. 10 is viewed from the internal member 3C side.

  The surface layer members 1C and 2C and the internal member 3C are made of a metal such as aluminum or copper, but are not particularly limited as long as the material can be used for the heat pipe. The surface layer members 1C and 2C and the internal member 3C are metal-bonded to each other by, for example, diffusion bonding, but the bonding method is not limited to this. Moreover, if a refrigerant | coolant can be used as a refrigerant | coolant of heat pipes, such as water and a substitute Freon, it will not specifically limit.

  Convex portions 1Ca and 2Ca and surface portions 1Cb and 2Cb between the convex portions 1Ca and 2Ca are formed on the inner surface inside the container of the surface layer members 1C and 2C. Further, a communication path 1Cc formed so as to divide the convex portion 1Ca is formed in the convex portion 1Ca. A similar communication path is formed in the convex portion 2Ca. In addition, a connecting path is good also as a through-hole, without dividing convex part 1Ca and 2Ca.

  As shown in FIG. 10, in the container of the heat pipe 10 </ b> C, a plurality of liquid phase parts 11 </ b> C constituted by the internal members 3 </ b> C arranged in a square lattice shape, and the refrigerant vapor in a region other than the liquid phase part 11 </ b> C The gas phase portion 12 </ b> C is formed in a space that can move.

  The internal member 3C is connected to the surface layer members 1C and 2C by the convex portions 1Ca and 2Ca as connecting portions in the liquid phase portion 11C. In FIG. 10, a part of the internal member 3 </ b> C is omitted in order to represent the configuration of the convex portions 1 </ b> Ca and 2 </ b> Ca, but the internal member 3 </ b> C is also arranged on the upper portion of the cross-shaped convex portion 1 </ b> Ca above the paper surface. Has been. The main body of the internal member 3C is disposed on the upper portion of the cross-shaped convex portion 1Ca, and the extending portion 3Cc is disposed on the upper portion of the linear convex portion 1Ca. The cross-shaped convex portion 1Ca may have another shape, for example, a polygonal shape.

  The liquid phase portion 11C has a groove-like refrigerant liquid holding region 11Ca having a U-shaped cross section. Refrigerant liquid holding region 11Ca is formed by projections 1Ca and 2Ca as connecting portions and extending portion 3Cc of internal member 3C, holds the refrigerant liquid, and moves along the internal member 3. It is configured to be able to. The communication path 1Cc functions as a first refrigerant liquid communication path that communicates with the adjacent refrigerant liquid holding region 11Ca in the liquid phase portion 11C.

  Note that the main body of the internal member 3C has a regular octagonal shape as shown in FIG. 10, and is located above the cross-shaped convex portion 1Ca. By making the main body of the internal member 3C into a regular octagonal shape, the area of the refrigerant liquid holding region 11Ca is widened. This makes it difficult for dryout during operation of the heat pipe 10C. However, the shape of the main body of the internal member 3C may be another shape, for example, a cross shape.

  The gas phase portion 12C is configured in a space where the vapor of the refrigerant can move in a region other than the liquid phase portion 11C.

  Further, the first refrigerant liquid communication path 1Cc on the surface layer member 1C side and the first refrigerant liquid communication path 2Cc on the surface layer member 2C side are separated via the internal member 3C.

  The internal member 3C has a communication path 3Ca as a second refrigerant liquid communication path, and a communication path 3Cb as a refrigerant vapor communication path is formed by the extending portion 3Cc. As shown in FIG. 13, the communication path 3 </ b> Cb functions as a refrigerant vapor communication path that allows the gas phase portions 12 </ b> C to communicate with each other. The refrigerant vapor can travel between the gas phase portions 12C via the communication path 3Cb.

  As shown in FIG. 14, the communication path 3Ca functions as a second refrigerant liquid communication path that communicates between the first refrigerant liquid communication paths 1Cc and 2Cc that are separated via the internal member 3C. As shown in FIGS. 14 and 15, the communication paths 1Cc and 2Cc are formed directly below the communication path 3Ca. As a result, the refrigerant liquid can travel between the refrigerant liquid holding regions 11Ca via the communication paths 1Cc, 2Cc, and 3Ca.

  In heat pipe 10C according to the third embodiment, when surface layer member 1C or 2C is brought into contact with a body to be cooled (for example, a heating element) (the contact portion at this time is a heat receiving portion), the refrigerant liquid is received at the heat receiving portion. It takes heat and evaporates, and the refrigerant vapor moves between the gas phase portions 12C and transports heat. When the refrigerant vapor reaches a region below a predetermined temperature, it is condensed and liquefied to become a refrigerant liquid. The refrigerant liquid returns to the heat receiving part through the refrigerant liquid holding region 11Ca of the liquid phase part 11C. In this way, the refrigerant recirculates.

  In this heat pipe 10C, since the liquid phase part 11C and the gas phase part 12C are arranged separately, the flow of the refrigerant liquid and the flow of the refrigerant vapor can be separated and can be formed in a loop shape. Further, since the gas phase portion 12C is formed by a container constituted by the surface layer members 1C and 2C, a wide space can be secured, and pressure loss accompanying the flow of the refrigerant vapor is reduced.

  Further, in the liquid phase portion 11C, the groove-like refrigerant liquid holding region 11Ca can obtain a sufficient amount of capillary (refluxing force) and can increase the surface area of the gas-liquid interface. The accompanying heat transfer performance can be increased. Further, since the refrigerant liquid holding region 11Ca communicates with the communication paths 1Cc, 2Cc, and 3Ca having a relatively small channel cross-sectional area, a large capillary force can be obtained, and the surface layer member 1C side can be obtained. The refrigerant liquid can be efficiently exchanged between the refrigerant liquid holding area 11Ca and the refrigerant liquid holding area 11Ca on the surface layer member 2C side. In the heat pipe 10C, due to these synergistic effects, larger heat transport can be achieved than in the conventional case, and the thermal resistance can also be reduced.

  Further, in this heat pipe 10C, the liquid phase portion 11C and the gas phase portion 12c are arranged separately, and in the liquid phase portion 11C, the internal member 3C exists between the surface layer members 1C and 2C. Therefore, the mechanical strength with respect to the internal pressure accompanying the temperature change of a refrigerant | coolant or the pressure from the outside is strong. As a result, the heat pipe 10C is advantageous in terms of strength as compared with a case where the flat plate members are simply laminated and is prevented from being easily deformed even when subjected to an external force. Furthermore, even if this heat pipe 10C is bent with an appropriate curvature, the function is not impaired, and the shape can be changed relatively freely according to various uses.

  Further, in the heat pipe 10, the communication path 3Cb communicates between the gas phase portions 12C, so that the refrigerant vapor can be spread over the other gas phase portions 12C. As a result, the gas phase portion 12C can be efficiently used as a whole, so that the heat dissipation efficiency is improved.

  As described above, the heat pipe 10C according to the third embodiment has a high heat transport capability.

  Similarly to the heat pipes 10 and 10A according to the first and second embodiments, in the region that becomes the gas phase portion 12C, the surface layer members 1C and 2C are formed with convex portions and grooves that become the refrigerant liquid holding region, The refrigerant liquid may be spread to the surface of the gas phase portion 12C to further increase the heat transfer performance associated with evaporation and condensation.

  Further, similarly to the heat pipe 10A according to the second embodiment, the connection portion may have a communication path as a refrigerant vapor communication path. FIG. 16 is a diagram illustrating a configuration in which the connection portion includes a third refrigerant liquid communication path. FIG. 16 shows a configuration in which the convex portion 1Ca as the connecting portion in FIG. 15 is replaced with a convex portion 1Da. The convex portion 1Da has a communication path 1Dc as a first refrigerant liquid communication path and a communication path 1Da1 as a third refrigerant liquid communication path. The communication path 1Da1 communicates between the plurality of communication paths 1Dc. As a result, the refrigerant liquid can be exchanged between the refrigerant liquid holding regions 11Ca more efficiently, and the liquid passage between the liquid phase parts 11C can be secured, so that the liquid flow rate can be increased. Reduction of heat transport limit due to circulation can be prevented. As shown in FIG. 15, in this case, unlike FIGS. 13 and 14, the communication path 1 </ b> Dc may not be formed directly below the connection path 3 </ b> Ca, and communicates with the communication path 3 </ b> Ca via the connection path 1 </ b> Da <b> 1. If you do.

  In the third embodiment, the internal members 3C and the liquid phase portions 11C are arranged in a square lattice shape, but may be arranged in other polygonal lattice shapes such as a triangle, a hexagon, and an octagon. Good.

  The shape of the refrigerant liquid holding region is not limited to a U-shaped groove, but is formed so that the refrigerant liquid can be held and the refrigerant liquid can move along the longitudinal direction or the internal structure forming portion. For example, the cross section may be U-shaped, C-shaped, V-shaped, or the like.

  Further, the present invention is not limited by the above embodiment. What was comprised combining each component mentioned above suitably is also contained in this invention. For example, the internal member of the first embodiment may be applied to the second embodiment, or the groove of the second embodiment may be formed in the surface layer member of the first embodiment. Moreover, you may connect the internal member of Embodiment 1, 2 by a connection part. Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspect of the present invention is not limited to the above-described embodiment, and various modifications can be made.

1, 2, 1 ', 2', 1A, 2A, 1C, 2C Surface layer member 1a, 2a, 1'a, 2'a, 3'a1, 3'c1, 1Aa, 2Aa, 1Ca, 2Ca, 1Da Convex Part 1b, 2b, 1Ab, 2Ab, 1Cb surface part 2c, 2Ac, 3a, 3b, 1Aa1, 2Aa1, 1Cc, 1Dc, 1Da1, 3Aa, 3Ab, 3Ca, 3Cb, communication path 2Ab1 groove 3, 3'a, 3 ' b, 3'c, 3A, 3B, 3C Internal member 3c Recessed part 3Cc Extension part 4 Connection part 10, 10 ', 10A, 10B, 10C Heat pipe 11, 11A, 11C Liquid phase part 11a, 12b, 11Aa, 11Ca Refrigerant Liquid holding region 12, 12A, 12C Gas phase part 12a, 12Aa, 12Ba Refrigerant vapor flow path Ar1, Ar2, Ar3, Ar4, Ar5 Arrow H Heat spot L Refrigerant liquid

Claims (11)

A flat heat pipe,
A pair of surface layer portions constituting a sealed container having a hollow structure;
A plurality of internal structure forming portions arranged in the container;
A refrigerant sealed in the container;
With
Liquid phase portions and gas phase portions extending along the longitudinal direction of the internal structure forming portion are alternately arranged in the container,
The gas phase section has a refrigerant vapor flow path configured with a space in which the vapor of the refrigerant can move along the longitudinal direction,
The internal structure forming part is connected by a connection part provided between each of the pair of surface layer parts in the liquid phase part,
The liquid phase part is a groove-like refrigerant liquid formed by the connecting part and the internal structure forming part so as to hold the liquid of the refrigerant and move the liquid of the refrigerant along the longitudinal direction. Has a holding area,
The connecting portion may have a first refrigerant liquid communication path for communicating between the refrigerant liquid retention region adjacent,
The internal structure forming portion penetrates the internal structure forming portion so as to communicate between the refrigerant vapor flow paths separated via the internal structure forming portion, and with respect to the refrigerant liquid holding region heat pipe, characterized in Rukoto to have a refrigerant vapor communication passage extends in a direction intersecting. The internal structure forming portion passes through the internal structure forming portion so as to communicate between the first refrigerant liquid communication paths spaced apart via the internal structure forming portion, and the refrigerant liquid holding region and The heat pipe according to claim 1, further comprising a second refrigerant liquid communication path extending in a direction intersecting with both of the refrigerant vapor communication paths . The heat pipe according to claim 1 or 2 , wherein the internal structure forming portion has a recess formed along the longitudinal direction of the internal structure forming portion and communicating with the refrigerant vapor flow path. It has a connection part which connects the said internal structure formation part adjacent to each other, The heat pipe as described in any one of Claims 1-3 characterized by the above-mentioned. The heat pipe according to claim 4 , wherein a thickness of the connecting portion is thinner than a thickness of the internal structure forming portion. A flat heat pipe,
A pair of surface layer portions constituting a sealed container having a hollow structure;
A plurality of internal structure forming portions arranged in the container;
A refrigerant sealed in the container;
With
In the container, there are a plurality of liquid phase portions constituted by the internal structure forming portion, and a gas phase portion constituted by a space in which the vapor of the refrigerant can move in a region other than the liquid phase portion. Formed,
The internal structure forming part is connected by a connection part provided between each of the pair of surface layer parts in the liquid phase part,
The liquid phase part is formed in a groove-like shape formed by the connection part and the internal structure forming part so as to hold the liquid of the refrigerant and to move the liquid of the refrigerant along the internal structure forming part. A refrigerant liquid holding area;
The connecting portion has a first refrigerant liquid communication path that communicates between adjacent refrigerant liquid holding regions,
The internal structure forming portion has a second refrigerant liquid communication path that communicates between the first refrigerant liquid communication paths that are separated via the internal structure forming section,
The heat phase, wherein the gas phase part is communicated by a refrigerant vapor communication path that penetrates the internal structure forming part . The internal structure forming portion passes through the internal structure forming portion so as to communicate between the first refrigerant liquid communication paths spaced apart via the internal structure forming section, and is connected to the refrigerant vapor communication path. The heat pipe according to claim 6 , further comprising a second refrigerant liquid communication path extending in a direction intersecting with the refrigerant pipe. The heat pipe according to any one of claims 1 to 7 , wherein the connection portion includes a third refrigerant liquid communication path that allows communication between the plurality of first refrigerant liquid communication paths. The heat pipe according to any one of claims 1 to 8 , wherein a groove is formed on at least one inner surface of the pair of surface layer portions in the gas phase portion. The heat pipe according to any one of claims 1 to 9 , further comprising a convex portion formed on an inner surface of at least one of the pair of surface layer members in the gas phase portion. The heat pipe according to claim 10 , wherein the convex portion is formed along a longitudinal direction of the internal structure forming portion.

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