JP2014152983A - Cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooler which improves strength of an air duct and reduces vibrations occurring in the air duct with a simple structure.SOLUTION: An air duct 5 of a cooler 100 includes: a cover member 54 which is formed by bending a plate material and connecting upper ends of a pair of side wall parts 51 by a top plate part 52; a pair of channels 55 which connect lower end parts of both side wall parts 51 of the cover member 54 with a base block 1; a lower connection plate 56 which supports a lower end of a pipe 3 penetrating therethrough and is connected with the cover member 54; and an upper connection plate 57 which supports an upper end of the pipe 3 penetrating therethrough and is connected with the cover member 54.

Description

  The present invention relates to a cooler used for cooling a control device using a semiconductor element such as a power transistor or a thyristor of an electric vehicle.

As coolers used for cooling control devices using semiconductor elements such as power transistors and thyristors, for example, coolers using pipes as shown in Patent Document 1 and Patent Document 2 are known.
In the cooler described in Patent Document 1, a plurality of tanks having a large cross-sectional area are embedded in a base block (heat receiving block) that receives heat from a heating element such as a semiconductor element, and a plurality of tanks are provided on a side surface of an exposed portion of the tank. A thin pipe is erected and a plurality of fins are attached to the pipe, so that the heat of the heating element can be cooled by outside air.

In addition, in the cooler (cooling device) described in Patent Document 2, one end portions of a plurality of pipes through which a refrigerant flows are attached to the outer surface side of a base block (heat receiving plate), and the other end portions of the respective pipes. In the same manner as the cooler of Patent Document 1, the heat of the heating element can be cooled by outside air.
And in such a cooler, in many cases, by covering the periphery of the radiating fins with a ventilation duct, the outside air can be blown well into the ventilation duct when the vehicle is running so as to be cooled. In the cooler described in Patent Document 2, a constant cooling action can be ensured regardless of whether the vehicle is running or stopped by providing a blower fan that forcibly blows outside air in the ventilation duct. It is like that.

JP 2004-125381 A Japanese Patent No. 2759587

  By the way, in the cooler having the structure using the ventilation duct as described above, the ventilation duct vibrates when the vehicle travels, and breakage such as cracks may occur. Therefore, conventionally, various measures for suppressing vibration have been taken, such as by welding a strength member such as an angle that becomes a strong wheel on the outside of the ventilation duct. However, the vibration conditions generated in the ventilation duct due to the speeding up of the vehicle have become more severe, and further improvement in the strength of the ventilation duct is required to suppress vibration.

  Moreover, in the cooler described in Patent Document 2, the vibration of the pipe due to traveling wind is suppressed by connecting the end of the pipe on the side of the heat radiating fin with a connecting member and supporting it on a fixed part (such as a ventilation duct). However, in an environment where the ventilation duct vibrates, the pipe may be damaged by the vibration of the ventilation duct.

  This invention is made in view of such a situation, Comprising: It aims at providing the cooler which can improve the intensity | strength of a ventilation duct with simple structure, and can reduce the vibration which arises in a ventilation duct. To do.

  The cooler of the present invention includes a base block to which a heating element is mounted, a plurality of tanks embedded in the other side of the mounting surface of the base block and containing a refrigerant, and a side surface of the tank. A plurality of pipes connected in a standing state parallel to the plurality of pipes, a plurality of heat radiation fins attached to the pipes in a state of passing through the plurality of pipes, and the pipes and the heat radiation fins attached to the base block And a ventilation duct that forms a ventilation path along the longitudinal direction of the tank. The ventilation duct is formed by bending a plate material, and the upper ends of a pair of side wall portions are connected by a top plate portion. A cover member, a pair of channels that connect lower end portions of both side wall portions of the cover member to the base block, and a bottom that is connected to the cover member while supporting the lower end of the pipe. Connecting the plates, characterized in that it is configured to be supported in a state of penetrating the upper end of the pipe and an upper connecting plate which is connected to said cover member.

The cooling unit of the cooler includes a base block, a tank, pipes, and heat radiating fins. These cooling units have higher rigidity than a ventilation duct formed by bending a plate material.
The ventilation duct is connected to the pipe by the lower connecting plate and the upper connecting plate, and the overall rigidity is enhanced. Moreover, the ventilation duct and the pipe can be fixed in a stable state by supporting the lower connecting plate and the upper connecting plate with a plurality of pipes penetrating them.
Therefore, vibration generated in the ventilation duct can be reduced.

In addition, the simple structure of providing a connecting plate can improve the strength and does not require complicated work such as welding strength members such as angles on the outside of the ventilation duct. Can also be improved.
Furthermore, the lower connecting plate of the ventilation duct divides the air passage where the heat dissipating fins are disposed and the space below the air passage, and moisture such as rainwater attached when outside air passes through the air passage adheres to the base block. Is prevented. For this reason, the contact between the electronic component (heating element) mounted on the base block and moisture is reliably prevented, and failure of the electronic component due to rainwater or the like can be avoided.

  According to the present invention, the strength of the ventilation duct can be improved with a simple structure in which the connecting plate is provided inside the ventilation duct, and the vibration generated in the ventilation duct can be reduced.

It is a front view which shows the cooler of one Embodiment of this invention. It is a left view of the cooler shown in FIG. It is a top view of the cooler shown in FIG. It is sectional drawing which follows the AA line of FIG. It is a figure explaining the pipe erected in the tank.

Hereinafter, an embodiment of a cooler of the present invention will be described with reference to the drawings.
1 to 4 show a cooler 100 according to an embodiment of the present invention. As shown in FIGS. 1 and 4, the cooler 100 has a base block 1 on which the heating element 9 is mounted and a mounting surface 11 of the heating element 9 mounted on the base block 1 on the other side (opposite surface). ) A plurality of tanks 2 buried in 12, a plurality of pipes 3 connected in a standing state on the side of the tank 2, and a plurality of pipes 3 that are penetrated and attached to these pipes 3 And a ventilation duct 5 which is attached to the base block 1 and surrounds the pipe 3 and the radiation fin 4 and forms a blower passage 50 along the longitudinal direction of the tank 2.

  The base block 1 is made of a metal such as aluminum or copper having a high heat capacity and excellent thermal conductivity. In the base block 1, a heating element 9 such as an electronic component is mounted on the mounting surface 11 on the lower surface side, and the tank 2 is embedded in the other surface 12 of the mounting surface 11 of the heating element 9.

As shown in FIG. 4, the tank 2 is formed of a pipe having a circular cross section. A plurality of thin pipes 3 are provided upright on the side surface of the tank 2. As shown in FIG. 5, the pipes 3 are arranged in parallel (in a row) with a predetermined interval on the side surface (upper surface in FIG. 4) of each pipe 2. The tank 2 and the pipe 3 are joined together by brazing with the internal space integrated, and a coolant such as water or perfluorocarbon is accommodated therein.
The tank 2 and the pipe 3 are made of aluminum or copper.

  As shown in FIGS. 1 and 4, a plurality of tanks 2 to which a plurality of pipes 3 are attached are arranged in parallel on the base block 1, thereby arranging the pipes 3 in a matrix. Note that more than half of the tank 2 is embedded in the base block 1, and the base block 1 and the tank 2 are integrally joined by soldering or the like. For this reason, the heat transfer between the base block 1 and the tank 2 is performed smoothly.

  In addition, a plurality of thin plate-like heat radiation fins 4 made of aluminum or copper having excellent thermal conductivity are attached to the pipe 3 so as to be skewered in a state of passing through the pipe 3. The radiating fin 4 is provided with a plurality of through holes (not shown) formed at a predetermined position of the thin plate by, for example, burring, etc., and the pipe 3 is press-fitted into these through holes, thereby radiating fin 4 Are integrally attached to each heat sink 3. In addition, the heat radiation fin 4 can also be attached by expanding the pipe 3.

As shown in FIG. 4, the ventilation duct 5 is formed by bending a plate material, and includes a cover member 54 formed by connecting upper ends of a pair of side wall portions 51 with a top plate portion 52, and both side wall portions 51 of the cover member 54. A pair of channels 55 that connect the lower end to the base block 1, a lower connecting plate 56 that supports the lower end of the pipe 3 and is connected to the cover member 54, and supports the upper end of the pipe 3. An upper connecting plate 57 connected to the cover member 54 is included.
Note that a flange portion 53 is provided at the lower end portion of the side wall portions 51 of the cover member 54, and the cover member 54 is connected to the base block 1 via the channel 55 by fastening the flange portion 53 to the channel 55. It is set as the structure fixed to.

  The lower connecting plate 56 and the upper connecting plate 57 are provided with a plurality of through holes (not shown) through which the pipe 3 passes. The lower connecting plate 56 and the upper connecting plate 54 penetrate the pipe 3 through the through holes. In the state, it is connected to both side wall portions 51 of the cover member 54. The heat radiation fin 4 is disposed between the lower connection plate 56 and the upper connection plate 57. The through holes of the lower connecting plate 56 and the upper connecting plate 57 can be formed by burring or the like.

The channel 55 is formed in a groove shape, and is fixed in parallel on the base block 1 with the opening facing outward. Then, the lower connecting plate 56 is placed on the channel 55, and the flange portion 53 of the cover member 54 is placed on the lower connecting plate 56 so that the lower connecting plate 56 is placed on the flange portion 53 of the channel 55 and the cover member 54. It is fixed in a state of being sandwiched between.
Moreover, in this embodiment, as shown in FIG.1 and FIG.4, the side wall part 51 and the top-plate part 52 which comprise the cover member 54 of the ventilation duct 5 shape | mold a single board | plate material in U shape. By doing so, they are integrally formed and are attached so as to straddle between both channels 55.

  A space surrounded by the ventilation duct 5 and the base block 1 is divided by a lower connecting plate 56 into an air passage 50 in which the radiation fins 4 are disposed and a space 55 below the air passage 50. Further, flange-shaped joint plates 6 are provided at both ends (inlet and outlet) of the air passage 50.

Moreover, the cooler 100 of this embodiment can be assembled as follows.
First, as shown in FIG. 5, the tank 2 and the pipe 3 are joined together. A concave groove (not shown) for fitting the tank 2 into a predetermined position is formed in the base block 1 in advance.

Next, the upper connecting plate 57 is fixed with a bolt 83 to the cover member 54 in which the side wall portion 51 and the top plate portion 52 are integrally formed. Then, the cover member 54 to which the upper connecting plate 57 is fixed is put on the base block 1. At this time, the upper end of the pipe 3 is press-fitted into the through hole of the upper connecting plate 57, whereby the pipe 3 and the upper connecting plate 57 are supported with each other.
Finally, the flange 55 of the channel 55, the lower connecting plate 56, and the cover member 54 is fastened with the bolt 82, and the lower connecting plate 56 is fixed in a state of being sandwiched between the channel 55 and the cover member 54. The cooler 100 can be assembled.

  In the cooler 100 configured as described above, heat generated from the heating element 9 is transmitted to the base block 1 and further transmitted from the base block 1 to the tank 2 to evaporate the refrigerant in the tank 2. The evaporated refrigerant rises in the pipe 3, and the heat is transferred to the heat radiation fins 4 through the pipe 3 and released into the atmosphere. The refrigerant that has risen in the pipe 3 releases heat, condenses, descends in the pipe 3, and returns to the tank 2. By repeating such circulation of the refrigerant, the heat generated from the heating element 9 can be released into the atmosphere, and the temperature rise of the heating element 9 can be suppressed and stable performance can be exhibited.

In the cooler 100 of the present embodiment, the ventilation duct 5 is configured such that both side wall portions 51 of the cover member 54 are connected to the pipe 3 by the lower connection plate 56 and the upper connection plate 57. Overall rigidity is increased from the bottom to the top. Moreover, the ventilation duct 5 and the pipe 3 can be fixed in a stable state by supporting the plurality of pipes 3 through the lower connection plate 56 and the upper connection plate 57.
Therefore, vibration generated in the ventilation duct 5 can be reduced.

Further, the strength of the ventilation duct 5 can be improved by a simple structure in which a connecting plate is provided in the air duct 50, and complicated work such as welding of a strength member such as an angle to the outside of the ventilation duct 5 is required. Therefore, the design of the appearance of the ventilation duct 5 can be improved.
Further, the lower connecting plate 56 of the ventilation duct 5 divides the air passage 50 where the radiation fins 4 are disposed and the lower space 58 thereof, and moisture such as rainwater attached when outside air passes through the air passage 50. Adhering to the base block 1 is prevented. For this reason, the contact between the electronic component (heating element 9) mounted on the base block and moisture can be reliably prevented, and failure of the electronic component due to rainwater or the like can be avoided.

  In addition, when the cooler 100 of the present embodiment was actually manufactured and subjected to a vibration addition test, the conventional cooler (the lower connecting plate 56 and the upper connecting plate 57 were not provided, and the outside of the ventilation duct 5 was strengthened by a strong ring. It was confirmed that the stress generated on the supported structure) was reduced to about half and the strength of the entire ventilation duct 5 could be improved.

In addition, this invention is not limited to the thing of the structure of the said embodiment, In a detailed structure, a various change can be added in the range which does not deviate from the meaning of this invention.
For example, the radiating fins 4 are configured to be attached in a state where all the pipes 3 are penetrated as in the above-described embodiment, and are configured to be divided into a plurality of blocks and attached to each of the plurality of pipes 3. You can also

DESCRIPTION OF SYMBOLS 1 Base block 2 Tank 3 Pipe 4 Radiation fin 5 Ventilation duct 6 Joint plate 9 Heat generating body 11 Mounting surface 12 The other surface 50 Airflow path 51 Side wall part 52 Top plate part 53 Brim part 54 Cover member 55 Channel 56 Lower connection board 57 Upper connection Plate 58 Lower space 81-83 Bolt 100 Cooler

Claims (1)

  The base block to which the heating element is mounted, the mounting surface of the base block on which the heating element is mounted, a plurality of tanks embedded in the other surface and containing the refrigerant, and the side surface of the tank standing in parallel to each other A plurality of pipes connected to each other, a plurality of heat radiation fins attached to the pipes in a state of passing through the plurality of pipes, and the tank attached to the base block and surrounding the pipes and the heat radiation fins A ventilation duct that forms a ventilation path along the longitudinal direction of the cover, and the ventilation duct is formed by bending a plate material, and a cover member formed by connecting upper ends of a pair of side wall portions with a top plate portion, and the cover member A pair of channels that connect lower ends of both side walls to the base block, a lower connecting plate that is supported through the lower ends of the pipes and connected to the cover member, and Cooler, characterized in that it is configured to have an upper connecting plate which is connected to said cover member is supported in a state of penetrating the top end of the flop.

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