JP6813137B1 - Manufacturing method of heat pipe type cooler and heat pipe type cooler - Google Patents

Abstract

The heat pipe type cooler (100) in the present disclosure has a heat receiving portion (5) having a surface on which the heating element (4) is installed and a main pipe body (1) having a connecting portion (6) facing the heat receiving portion (5). ), A branch pipe body (2) connected to the connection portion (6) so that the inside communicates with the inside of the main pipe body (1), and a heat pipe unit having the branch pipe body (2). A fin (3) is provided, and the space region between the heat receiving portion (5) and the connecting portion (6) is divided into multiple stages to form a plurality of space portions, and inside each of the plurality of space portions. The refrigerant (8) is arranged.

Description

The present disclosure relates to a heat pipe type cooler and a method for manufacturing a heat pipe type cooler.

A heat pipe unit is disclosed in which a plurality of thin pipes are provided on the side surface of a tank having a large cross-sectional area, for example, a circular cross-section, and fins are attached to the thin pipes. The tank is embedded in a base block made of metal, and heat transfer is performed between the tank and the base block. A semiconductor element that generates heat is attached to the surface of the base block opposite to the surface in which the tank is embedded (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2004-125381

However, in the technique of Patent Document 1, when a semiconductor element and a plurality of heat pipe units are connected by a base block, it is necessary to deeply embed a tank for heat transport to the heat pipe unit, and the volume of the base block increases. , There is a problem that the weight of the heat pipe type cooler increases.

The present disclosure has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a heat pipe type cooler and a method for manufacturing a heat pipe type cooler capable of suppressing a weight increase.

The heat pipe type cooler according to the present disclosure has a heat receiving portion having a surface on which a heating element is installed, a main pipe having a connecting portion facing the heat receiving portion, and a connecting portion so that the inside communicates with the inside of the main pipe. A heat pipe unit having a branch pipe body to be connected, and fins attached to the branch pipe body are provided, and heat is generated in a heat pipe type cooler used in a railroad vehicle so that running wind flows through the fins. The surface on which the body is installed is a surface that extends in the vertical direction, and the space area between the heat receiving portion and the connecting portion is divided in multiple stages in the vertical direction to form a plurality of space portions, and each of the plurality of space portions has a surface. The refrigerant is arranged so as to have a liquid level, and the branch pipe body is tilted so that the internally condensed refrigerant returns to the main pipe body due to gravity, and is connected to the connection portion above the liquid level of the refrigerant in the space. In the heat receiving part, a wick that sucks up the refrigerant and holds the refrigerant is arranged on the surface opposite to the surface on which the heating element is installed , and the heat receiving part or the connecting part has an uneven shape, and heat is received by the concave and convex concave portions. The space area between the portion and the connecting portion is divided into multiple stages, and a plurality of space portions are formed by the convex portions .

The method for manufacturing a heat pipe type cooler according to the present disclosure includes a step of forming a concavo-convex member by bending a first plate member to form a continuous concavo-convex shape and forming a concavo-convex member, and a second plate member on the concavo-convex member. As a mounting mounting member, the space area between the concave-convex member and the mounting member is divided by concave-convex-shaped recesses to form a main tubular body having a multi-stage structure in the vertical direction, and the refrigerant condensed inside is gravity. The branch pipe is attached to the uneven member or the mounting member above the liquid level of the refrigerant injected into the convex portion of the concave-convex shape, and the inside of the main pipe and the branch pipe are attached. A branch pipe connection step that connects the inside by communicating with each other , a refrigerant injection step that injects a refrigerant so that each of the convex portions of the main pipe has a liquid level, and fin mounting that attaches fins to the branch pipe. It has a process.

According to the present disclosure, the weight increase of the heat pipe type cooler can be suppressed.

The schematic block diagram of the heat pipe type cooler which concerns on Embodiment 1. FIG. The schematic side view of the heat pipe type cooler which concerns on Embodiment 1. FIG. The schematic sectional view of the heat pipe type cooler which concerns on Embodiment 1. FIG. The process chart which shows the manufacturing method of the heat pipe type cooler which concerns on Embodiment 1. FIG. The schematic sectional view of the heat pipe type cooler which concerns on Embodiment 2. FIG. The process chart which shows the manufacturing method of the heat pipe type cooler which concerns on Embodiment 2. The schematic sectional view of the heat pipe type cooler which concerns on Embodiment 3. FIG. The process chart which shows the manufacturing method of the heat pipe type cooler which concerns on Embodiment 3. FIG. FIG. 6 is a schematic cross-sectional view of the heat pipe type cooler according to the fourth embodiment. FIG. 6 is a schematic cross-sectional view of the heat pipe type cooler according to the fifth embodiment. The process chart which shows the manufacturing method of the heat pipe type cooler which concerns on Embodiment 5.

Embodiment 1.
FIG. 1 is a schematic configuration diagram of the heat pipe type cooler 100 according to the first embodiment. FIG. 2 is a schematic side view of the heat pipe type cooler 100 according to the first embodiment, and is a schematic side view of the heat pipe type cooler 100 viewed from the left side of the paper surface of FIG. FIG. 3 is a schematic cross-sectional view of the heat pipe type cooler 100 according to the first embodiment, and is a schematic cross-sectional view showing the AA cross section of FIG.

The X-axis direction of FIG. 1 indicates the width direction of the heat pipe type cooler 100, and the Y-axis direction indicates the height direction, that is, the vertical direction of the heat pipe type cooler 100. The −Y axis direction indicates the installation surface direction of the heat pipe type cooler 100 (lower side of the heat pipe type cooler 100), and the + Y axis direction indicates the opposite installation surface direction (upper side of the heat pipe type cooler 100). Shown. The Z-axis direction in FIG. 1 indicates the depth direction of the heat pipe type cooler 100. These are also the same in the following drawings. Here, the installation surface refers to the floor surface or the like of a vehicle in which the heat pipe type cooler 100 is installed. The anti-installation surface refers to a virtual surface facing the installation surface, the ceiling of the vehicle, or the like.

The heat pipe type cooler 100 includes a main pipe body 1 in which the refrigerant 8 is arranged, a branch pipe body 2 connected to the main pipe body 1, and fins 3 attached so as to penetrate the branch pipe body 2. The main pipe body 1 and the branch pipe body 2 are collectively referred to as a heat pipe unit. The details will be described below.

The main tubular body 1 has a heat receiving portion 5 having a surface to which the heating element 4 is attached, and a connecting portion 6 to which the branch tubular body 2 is connected. Here, the heating element 4 refers to an electric device or the like on which a semiconductor element is mounted. The heat receiving portion 5 and the connecting portion 6 are arranged so as to face each other. Here, the fact that the heat receiving portion 5 and the connecting portion 6 face each other means that, for example, the surface of the heat receiving portion 5 to which the heating element 4 is attached and the surface of the connecting portion 6 to which the branch pipe body 2 is attached face each other. .. A space region is formed between the heat receiving portion 5 and the connecting portion 6, that is, inside the main pipe body 1. It can be said that the main body 1 is hollow. Inside the main body 1, a partition plate 7 is arranged so as to partition between the heat receiving portion 5 and the connecting portion 6. The inside of the main pipe 1 has a plurality of space portions divided and formed by a partition plate 7, and the refrigerant 8 is arranged in each of the plurality of space portions. The main body 1 has a multi-stage structure in which a plurality of space portions are formed in the Y-axis direction. The partition plate 7 extends in the X-axis direction.

The branch tube body 2 is, for example, a circular tube. The branch pipe body 2 is attached to the connection portion 6 of the main pipe body 1. The inside of the branch pipe body 2 communicates with the inside of the main pipe body 1 and is connected. At this time, at least one branch pipe body 2 is connected to each space portion of the main pipe body 1.

Further, when the heat pipe type cooler 100 is used for cooling the inverter for a railroad vehicle, if the vehicle tilts during traveling or the like and the refrigerant flows into the branch pipe body 2, the amount of the refrigerant in the main pipe body 1 decreases. Sufficient boiling does not occur and the cooling efficiency decreases. When the branch pipe body 2 is connected to the connection portion 6 of the main pipe body 1, if the branch pipe body 2 is connected above the liquid level of the refrigerant 8, the refrigerant 8 can be suppressed from flowing into the branch pipe body 2 even if the vehicle is tilted. ..

Further, as shown in FIGS. 2 and 3, the branch pipe body 2 may be tilted with respect to the anti-installation surface and connected to the connecting portion 6. At this time, the angle formed by the main pipe body 1 and the branch pipe body 2 is preferably 80 ° to 85 °, but this is not the case. As a result, the refrigerant 8 that receives the heat of the heating element 4 and evaporates is condensed inside the branch pipe body 2 by the fins 3 and can return to the main pipe body 1 by gravity.

Returning to FIG. 1, at least one or more branch pipe bodies 2 are connected to each space portion of the main pipe body 1. At least one of the branch pipes 2 connected to each space serves as an injection pipe having a refrigerant injection hole 20 formed at the tip thereof. The refrigerant 8 is injected from each injection pipe into each space of the main pipe 1.

The fin 3 penetrates the branch pipe body 2 and is attached to the branch pipe body 2. In other words, the fins 3 are attached to the branch tube body 2 so as to be skewered.

Here, the flow of cooling of the heating element 4 using the heat pipe type cooler 100 will be described. The heat generated from the heating element 4 is transferred from the heat receiving unit 5 to the refrigerant 8 in the main body 1. This heat is used to evaporate the refrigerant 8, and the steam is transported to the branch pipe body 2. The vapor transported to the branch tube 2 is cooled by the fins 3 and condensed to become a liquid. The liquid refrigerant 8 returns to the main body 1 due to gravity. When the refrigerant 8 repeats this circulation, the heat generated from the heating element 4 is efficiently dissipated into the atmosphere by the latent heat of the phase change, and highly efficient cooling is realized.

FIG. 4 is a process diagram showing a method of manufacturing the heat pipe type cooler 100 according to the first embodiment. The details will be described below.

In step ST1, the four sides of the heat receiving member, which is one plate member, are bent into an L shape by, for example, pressing to form the heat receiving portion 5 (heat receiving portion forming step). By bending the heat receiving member, a heat receiving portion 5 having a surface on which the heating element 4 is attached and a side surface portion surrounding the heat receiving portion 5 are formed. The plate member to be the side surface may be connected to the plate member to be the heating element 4 by brazing or the like. Further, the heat receiving portion 5 refers to a portion including a surface on which the heating element 4 is installed.

In step ST2, the partition plate 7 is arranged on the surface of the heat receiving portion 5 opposite to the surface on which the heating element 4 is attached (partition plate arrangement step). The partition plate 7 is connected to the mounting surface portion and the side surface portion of the heat receiving portion 5 by, for example, brazing.

In step ST3, a connecting member is attached to the partition plate 7 and the heat receiving portion 5 partitioned by the partition plate 7, for example, by brazing to form the connecting portion 6 (connection portion attaching step). As a result, the main body 1 having a multi-stage structure is formed inside. In the connecting portion 6, a mounting hole for the branch pipe body 2 to be connected is formed in advance, or is formed after being attached to the heat receiving portion 5. Further, the connection portion attaching process can be said to be a main pipe body forming process.

In step ST4, the branch pipe body 2 is arranged in each attachment hole, attached to the connection portion 6 by brazing, for example, and communicated with the inside of the branch pipe body 2 and the inside of the main pipe body 1 (branch pipe body connection step). ). At this time, at least one of the plurality of branch pipes 2 is an injection pipe having a refrigerant injection hole 20 formed at the tip thereof. The refrigerant injection hole 20 may be formed before connecting the branch pipe body 2 to the connecting portion 6, or may be formed after connecting the branch pipe body 2.

In step ST5, after sufficiently evacuating the insides of the main pipe body 1 and the branch pipe body 2, the refrigerant 8 is injected into each space inside the main pipe body 1 from the refrigerant injection hole 20 (refrigerant injection step). It is desirable that the injection amount of the refrigerant 8 is about 30% of each space. After injecting the refrigerant 8, the refrigerant injection hole 20 is closed by, for example, pressure welding. Thereby, the airtightness in the main pipe body 1 and the branch pipe body 2 can be maintained.

In step ST6, the fin 3 is attached to the branch pipe body 2 (fin attachment step). The fins 3 may be provided with branch tube through holes at predetermined intervals at positions where the branch tube 2 penetrates in advance, and burring may be performed to form fringes. The branch pipe body 2 is passed through the branch pipe body through hole, and the fin 3 is attached to the branch pipe body 2 by, for example, pressure welding. As a result, the heat pipe type cooler 100 is formed.

As a result, the heat receiving portion 5 having the surface on which the heating element 4 is installed and the main pipe body 1 having the connecting portion 6 facing the heat receiving portion 5 are connected to the connecting portion 6 so that the inside communicates with the inside of the main pipe body 1. A heat pipe unit having a branch pipe body 2 to be formed, and fins 3 attached to the branch pipe body 2 are provided, and a plurality of spatial regions between the heat receiving portion 5 and the connecting portion 6 are divided in multiple stages. A heat pipe type cooler 100 in which a space portion is formed and a refrigerant 8 is arranged inside each of the plurality of space portions can be manufactured.

With the above configuration, the weight increase of the heat pipe type cooler 100 can be suppressed.

Further, since the heating element 4 is attached to the main pipe body 1 without using the base block, the cooling efficiency can be improved.

Embodiment 2.
FIG. 5 is a schematic cross-sectional view of the heat pipe type cooler 110 according to the second embodiment. The heat pipe type cooler 110 differs from the heat pipe type cooler 100 in that it has a semicircular connection portion 6.

FIG. 6 is a process diagram showing a method of manufacturing the heat pipe type cooler 110 according to the second embodiment. In step ST30, the semicircular connecting portion 6 is arranged and attached to the plate-shaped heat receiving portion 5 (connection portion attaching step). At this time, since a plurality of semicircular connecting portions 6 are arranged in the Y-axis direction of the heat receiving portion 5, the heat pipe type cooler 110 has a multi-stage structure. Since the semicircular connecting portion 6 also serves as the side surface portion of the heat receiving portion 5 of the heat pipe type cooler 100, the steps corresponding to steps ST1 and ST2 are not described. Since steps ST4 to ST6 are the same as the method for manufacturing the heat pipe type cooler 100, detailed description thereof will be omitted.

With the above configuration, the weight increase of the heat pipe type cooler 110 can be suppressed.

Further, by attaching the semicircular connecting portion 6 to the heat receiving portion 5, the number of brazing times can be reduced and the workability can be improved. Then, it is possible to prevent the refrigerant 8 from leaking between the plurality of spaces of the main body 1.

In the second embodiment, an example in which the semicircular connecting portion 6 is attached to the heat receiving portion 5 is shown, but the semicircular shape also includes an elliptical shape and a flat shape.

Embodiment 3.
FIG. 7 is a schematic cross-sectional view of the heat pipe type cooler 120 according to the third embodiment. The heat pipe type cooler 120 is different from the heat pipe type cooler 100 in that the heat receiving portion 5 has an uneven shape.

FIG. 8 is a process diagram showing a method of manufacturing the heat pipe type cooler 120 according to the third embodiment. In step ST10, the heat receiving member is bent to form the heat receiving portion 5 having a continuous uneven shape (heat receiving portion forming step). The uneven shape of the heat receiving portion 5 may be formed by bending a single plate-shaped heat receiving member by, for example, extrusion processing using a mold, press processing, or the like.

Here, the uneven shape of the heat receiving portion 5 will be described. As shown in FIG. 8, the uneven shape is continuously formed from the installation surface of the heat pipe type cooler 100 toward the opposite installation surface. Of the concave-convex shape, for example, a plurality of space portions inside the main pipe 1 are formed by the convex portion. Then, the refrigerant 8 is arranged inside each convex portion. Further, the recessed portion of the heat receiving portion 5, that is, the portion protruding toward the connecting portion 6, corresponds to the partition plate 7 of the heat pipe type cooler 100.

Since steps ST3 to ST6 are the same as the method for manufacturing the heat pipe type cooler 100, detailed description thereof will be omitted.

As described above, the method for manufacturing the heat pipe type cooler 120 is a heat receiving portion forming step (a heat receiving portion forming step) in which the heat receiving member (first plate member) is bent to form a continuous uneven shape, and the heat receiving portion 5 (concave and convex member) is formed. (Concavo-convex member forming step) and a connecting member (second plate member) is attached to the heat receiving portion 5 to form a connecting portion 6 (mounting member), and the space region between the heat receiving portion 5 and the connecting portion 6 is formed by the concave and convex concave portion. The main pipe body forming step of forming the main pipe body 1 which is divided and has a multi-stage structure, and the branch pipe body 2 is attached to the heat receiving portion 5 or the connecting portion 6, and the inside of the main pipe body 1 and the inside of the branch pipe body 2 are communicated with each other. It has a branch pipe body connecting step of connecting the main pipe body 1, a refrigerant injection step of injecting the refrigerant 8 into the convex portion of the main pipe body 1, and a fin attaching step of attaching the fins 3 to the branch pipe body 2.

With the above configuration, the weight increase of the heat pipe type cooler 110 can be suppressed.

Further, since the multi-stage structure of the main pipe 1 can be formed without using the partition plate 7, the number of parts can be reduced.

Further, since the partition plate 7 is not used, the number of connection points due to brazing, for example, can be reduced, so that workability can be improved.

The heat receiving portion 5 is used as the first surface and the connecting portion 6 is used as the second plate portion, but the reverse is also possible. The uneven shape is not limited to the heat receiving portion 5, and the connecting portion 6 may have an uneven shape, or both the heat receiving portion 5 and the connecting portion 6 may have an uneven shape.

Embodiment 4.
FIG. 9 is a schematic cross-sectional view of the heat pipe type cooler 130 according to the fourth embodiment. The heat pipe type cooler 130 is different from the heat pipe type cooler 100 in that the wick 9 is arranged on the surface of the heat receiving unit 5 opposite to the surface installed on the heating element 4.

The wick 9 is, for example, a porous sintered body or a reticulated body made of fine particles as a material. The wick 9 is attached to the heat receiving portion 5 by, for example, soldering.

With the above configuration, the weight increase of the heat pipe type cooler 130 can be suppressed.

Further, since the wick 9 is arranged in the heat receiving portion 5, the refrigerant 8 is sucked up by the capillary force of the wick 9 and the refrigerant 8 is held, so that the boiling of the refrigerant 8 can be promoted and the cooling efficiency can be improved.

In the fourth embodiment, the height of the wick 9 installed on the heating element 4, that is, the length in the direction from the heat receiving portion 5 toward the connecting portion 6, is less than the length from the heat receiving portion 5 to the connecting portion 6. And. When the length of the wick 9 is equal to or greater than the length from the heat receiving portion 5 to the connecting portion 6, the wick 9 enters the branch pipe body 2, whereby the refrigerant 8 adhering to the wick 9 enters the branch pipe body 2. Refrigerant may flow into the water. As a result, the amount of the refrigerant in the main pipe 1 is reduced, sufficient boiling does not occur, and the cooling efficiency is lowered. If the length of the wick 9 is less than the length from the heat receiving portion 5 to the connecting portion 6, the refrigerant 8 adhering to the wick 9 can be suppressed from flowing into the branch pipe body 2.

Embodiment 5.
FIG. 10 is a schematic cross-sectional view of the heat pipe type cooler 140 according to the fifth embodiment. The heat pipe type cooler 140 is different from the heat pipe type cooler 100 in that an embedded portion 10 is formed in the heat receiving portion 5 and a heating element 4 is attached to the embedded portion 10.

FIG. 11 is a process diagram showing a method of manufacturing the heat pipe type cooler 140 according to the fifth embodiment. In step ST11, the embedded portion 10 is formed in a part of the heat receiving member to form the heat receiving portion 5 (heat receiving portion forming step). The embedded portion 10 is formed by, for example, press working. The formed embedded portion 10 is formed so as to protrude inside each space portion of the main pipe body 1, that is, toward the connecting portion 6. The embedded portion 10 of the heat receiving portion 5 is installed in the heating element 4 so as to cover at least a part of the heating element 4, for example, as shown in FIG. It is desirable that the embedded portion 10 is formed according to the shape of the heating element 4 to be installed, but this is not the case.

Since steps ST2 to ST6 are the same as the method for manufacturing the heat pipe type cooler 100, detailed description thereof will be omitted.

With the above configuration, the weight increase of the heat pipe type cooler 140 can be suppressed.

Further, by mounting the heating element 4 so as to be embedded in the convex shape of the heat receiving portion 5, the contact area between the heating element 4 and the heat receiving portion 5 can be increased, and the cooling efficiency can be further improved.

Although the example in which the partition plate 7 is arranged is shown in the fifth embodiment, the heat receiving portion 5 having an uneven shape may be used as in the heat pipe type cooler 130.

In the present disclosure, the heat pipe unit is divided for each heating element 4, but the number of heating elements 4 and the number of divisions of the heat pipe unit may be freely set without being limited to this division method.

Further, in the present disclosure, the thickness of the heat receiving portion 5 is formed to be thinner than the length between the heat receiving portion 5 and the connecting portion 6. As a result, the weight of the heat pipe unit can be reduced, and the heat from the heating element 4 can be efficiently transferred to the refrigerant 8.

Further, although an example in which the wick 9 is arranged in the heat receiving portion 5 of the fourth embodiment and the fifth embodiment is shown, it can be applied to any of the embodiments.

Further, in the present disclosure, the cross section of the main body is not limited to the rectangle of the first embodiment or the semicircular shape of the second embodiment, and it is sufficient that the heat receiving portion 5 can be divided into a plurality of space portions.

Further, in the present disclosure, the cross-sectional shape of each space portion of the main body 1 is not limited, but it is desirable that the cross-sectional shape is a rectangle having a long side in the Y-axis direction and a short side in the Z-axis direction. This is to ensure that the refrigerant 8 maintains a sufficient water level inside each space. The higher the water level of the refrigerant 8, the larger the area where the heating element 4 and the refrigerant 8 are in contact with each other via the heat receiving portion 5, and the boiling of the refrigerant is promoted.

Further, in the present disclosure, the intervals between the divisions of the main body 1, that is, the spaces of the main body 1 are formed at equal intervals, but when the sizes of the heating elements 4 are different, the intervals may be divided into unequal intervals. Good.

Further, in the present disclosure, the connecting end portion of the branch pipe body 2 is connected to the connecting portion 6 without penetrating into the main pipe body 1, but the branch pipe body 2 may be penetrated through the connecting portion 6. As a result, it is not necessary to cut the connection end portion of the branch pipe body 2 in accordance with the connection portion 6, so that workability can be improved and the manufacturing cost can be reduced.

Further, in the present disclosure, the angle between the fin 3 and the installation surface is orthogonal, but the angle is not limited to this, and the angle between the branch pipe body 2 and the fin 3 may be orthogonal. However, by making the angle between the fin 3 and the installation surface orthogonal to each other, the direction can be aligned with the mesh of the heat pipe type cooler cover (not shown), so that the running wind can easily flow in.

Further, in the present disclosure, the branch pipe bodies 2 are arranged at equal intervals on the left and right and up and down, but the arrangement method of the branch pipe bodies 2 is not limited to this arrangement, and the branch pipe bodies 2 are arranged at unequal intervals or staggered. You may. When the staggered arrangement is performed, the development of the temperature boundary layer around the branch pipe body 2 can be suppressed, and highly efficient cooling can be expected.

Further, in the heat pipe type coolers 100 to 140 of the present disclosure, an antifreeze solution such as acetone, methanol, or ethanol can be used as the refrigerant 8. Further, water or a liquid obtained by mixing alcohol or the like with water can also be used.

Further, the position of the refrigerant injection hole 20 is the tip of each injection pipe, but the position is not limited to this position.

Further, in the present disclosure, the material of the main pipe body 1 and the branch pipe body 2 may be copper, aluminum or the like having good thermal conductivity and workability. The material of the fin 3 may be aluminum, copper, or the like having good thermal conductivity.

Further, in the present disclosure, an example is shown in which the main pipe body 1 and the branch pipe body 2 are connected as separate bodies to form a heat pipe unit, but the main pipe body 1 and the branch pipe body 2 may be integrally formed. ..

Further, in the present disclosure, an example in which the heat pipe type coolers 100 to 140 are arranged perpendicularly to the installation surface is shown, but they may be arranged in an inclined manner depending on the shape of the heating element 4.

In the present disclosure, each embodiment can be freely combined, and each embodiment can be appropriately modified or omitted within the scope of the invention.

1 Main pipe, 2 Branch pipe, 3 Fins, 4 Heating element, 5 Heat receiving part, 6 Connection part, 7 Partition plate, 8 Refrigerant, 9 Wick, 10 Embedded part, 20 Refrigerant injection hole, 100, 110, 120, 130, 140 heat pipe type cooler.

Claims (5)

A main pipe body having a heat receiving portion having a surface on which the heating element is installed and a connecting portion facing the heat receiving portion, and a branch pipe body connected to the connecting portion so that the inside communicates with the inside of the main pipe body. With a heat pipe unit,
With fins attached to the branch tube body,
In a heat pipe type cooler used in a railroad vehicle so that running wind flows through the fins,
The surface on which the heating element is installed is a surface extending in the vertical direction.
The space region between the heat receiving portion and the connecting portion is divided in multiple stages in the vertical direction to form a plurality of space portions, and the refrigerant is arranged so as to have a liquid level in each of the plurality of space portions.
The branch tube is inclined so that the refrigerant condensed in the inside is returned to the main tube by gravity, and is connected to the connection portion above the liquid level of the refrigerant in the space,
The heat receiving portion, the surface on which the heating element is disposed on the opposite surface, the wick for holding the refrigerant sucked the refrigerant is arranged,
The heat receiving portion or the connecting portion has an uneven shape.
The space region between the heat receiving portion and the connecting portion is divided into multiple stages by the concave-convex-shaped concave portion, and the plurality of space portions are formed by the convex portion.
Human Topaipu cooler. The thickness of the heat receiving portion is thinner than the length from the heat receiving portion to the connecting portion.
The heat pipe type cooler according to claim 1 . The length of the wick in the direction from the heat receiving portion to the connecting portion is less than the length from the heat receiving portion to the connecting portion.
The heat pipe type cooler according to claim 1 or 2 . The heat receiving portion is formed so as to cover at least a part of the outer periphery of the heating element.
The heat pipe type cooler according to any one of claims 1 to 3 . The uneven member forming step of bending the first plate member to form a continuous uneven shape and forming the uneven member,
A second plate member is attached to the uneven member to serve as a mounting member, and a space region between the concave-convex member and the mounting member is divided by the concave-convex-shaped recess to form a main body having a multi-stage structure in the vertical direction. Main tube formation process and
The refrigerant condensed inside is tilted so as to return to the main pipe body due to gravity, and above the liquid level of the refrigerant injected into the convex portion of the concave-convex shape, the branch pipe body is attached to the concave-convex member or the attachment member. The branch pipe connecting step of connecting the inside of the main pipe and the inside of the branch pipe by communicating with each other.
A refrigerant injection step of injecting the refrigerant so that each of the convex portions of the concave-convex shape of the main pipe has a liquid level.
A method for manufacturing a heat pipe type cooler, which comprises a fin attaching step of attaching fins to the branch pipe body.

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