JP2019057656A - Electronic equipment with air cooling mechanism - Google Patents

Abstract

An electronic device with an air cooling mechanism having a simple structure and high cooling effect is provided.
An electronic apparatus with an air cooling mechanism according to the present invention includes a heat sink, an electrical element mounted on an inner side surface of the heat sink, and a housing for housing the electrical element together with the heat sink. A housing 6 that forms a cooling medium 24, a blower 12 that sends a refrigerant into the housing 24, and a vent hole 16 that discharges the refrigerant from the housing 24. The vent hole 16 has a slit shape, and the extending direction of the vent hole 16 is inclined with respect to the direction in which the blower 12 sends out the refrigerant.
[Selection] Figure 3

Description

  The present invention relates to an electronic device with an air cooling mechanism. Specifically, the present invention relates to an on-vehicle electronic device with an air cooling mechanism.

  In recent years, with the spread of hybrid vehicles and electric vehicles, vehicles that generate high voltage such as lithium ion batteries have been mounted on vehicles. On the other hand, many devices that operate at a low voltage such as an electric mirror and a power steering are mounted on the automobile. In addition, home appliances are moved by a car battery, and a car battery is charged from a home AC power source. In order to cope with these, automobiles are equipped with power conversion devices such as a DC-DC converter and a DC-AC inverter.

  The power conversion device includes electrical elements such as a transformer and a power transistor. These electric elements generate heat when a large amount of current flows during operation. The battery also generates heat. Many of these power conversion devices and battery modules have a cooling mechanism in order to suppress an increase in temperature. For example, in a power conversion device having an air cooling mechanism, a refrigerant is forcibly sent around an electrical element by a blower. This refrigerant removes heat from the electrical element and discharges it, so that the temperature rise of the device is suppressed. The examination about the electronic device which has an air cooling mechanism is reported by Unexamined-Japanese-Patent No. 2014-229560.

JP 2014-229560 A

  In order to effectively lower the temperature of the electronic device by air cooling, it is necessary to appropriately control the flow of the refrigerant to increase the heat radiation efficiency. This can complicate the internal structure. For example, in the battery pack disclosed in Japanese Patent Application Laid-Open No. 2014-229560, the flow of the refrigerant is controlled by providing a plurality of ducts inside. The complexity of the internal structure can increase the size of electronic equipment and increase costs.

  An object of the present invention is to provide an electronic device with an air cooling mechanism having a simple structure and a high cooling effect.

  An electronic apparatus with an air cooling mechanism according to the present invention includes a heat sink, an electrical element mounted on the inner surface of the heat sink, a housing that forms a housing for housing the electrical element together with the heat sink, and an interior of the housing A blower for sending the refrigerant to the inside and a vent hole for discharging the refrigerant from the container. The vent hole is slit-shaped, and the extending direction of the vent hole is inclined with respect to the direction in which the blower sends out the refrigerant.

  Preferably, the blower is an axial blower, and an angle θ formed by a direction in which a rotating shaft of a blade of the axial blower extends and an extending direction of the vent hole is 60 ° or more and 120 ° or less.

  Preferably, the angle θ is not less than 80 ° and not more than 100 °.

  The blower may be a centrifugal blower. In this case, preferably, an angle formed by a direction perpendicular to the blower opening of the centrifugal blower and an extending direction of the vent hole is 60 ° or more and 120 ° or less.

  Preferably, the electronic device further includes a guide plate that sends the refrigerant that has passed through the vent hole to the outer surface of the heat sink.

  Preferably, the heat sink includes a flat plate portion, one surface of which forms the inner surface on which the electrical element is mounted, and a plurality of plates protruding outward from the other surface of the flat plate portion and extending along the surface. The angle α formed by the extending direction of the heat radiating fin and the extending direction of the vent hole is 80 ° or more and 100 ° or less.

  Preferably, the electronic apparatus further includes a heat transfer cover that covers the electrical element from the housing side with a gap between the electrical element, and the heat transfer cover is provided on the blower side. To the opposite side.

  In the electronic apparatus with an air-cooling mechanism according to the present invention, the refrigerant is sent out by a blower into the housing body in which the electrical element is housed, and is discharged from the vent hole. As a result, the heat of the electrical element is taken away by the refrigerant and released to the outside air together with the refrigerant. The vent hole has a slit shape, and the extending direction of the vent hole is inclined with respect to the direction in which the blower sends out the refrigerant. By doing in this way, the width | variety of the vent hole seen from the direction through which a refrigerant | coolant flows can be enlarged. Even if the refrigerant flow is disturbed by an electric element or the like, the refrigerant can be efficiently discharged from the vent hole. In this electronic device, the refrigerant is prevented from staying inside the container. Heat from the electrical element is effectively discharged to the outside. The structure of this electronic device is simple. In this electronic apparatus, effective cooling is realized with a simple structure.

FIG. 1 is a perspective view showing an electronic apparatus with an air cooling mechanism according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the electronic device of FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG. FIG. 6 is a front view showing a housing of the electronic device of FIG. FIG. 7 is a cross-sectional view illustrating an electronic apparatus according to another embodiment of the present invention.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  FIG. 1 shows an electronic apparatus 2 with an air cooling mechanism according to an embodiment of the present invention. The electronic device 2 is a power conversion device. FIG. 2 is an exploded perspective view of the electronic device 2 of FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG. The electronic device 2 includes a heat sink 4, a housing 6, a circuit board 8, an electrical element 10, a blower 12, a heat transfer cover 13, a connector 14, a vent hole 16, and a guide plate 18. 3 and 4, the connector 14 is omitted.

  In this specification, the direction indicated by the arrow X in FIG. 1 is the front of the electronic apparatus 2 and the opposite direction is the rear. The direction in which the blower 12 is located is the front. The direction indicated by the arrow Z is the upward direction, and the opposite direction is the downward direction. The direction in which the heat sink 4 is located is the downward direction. The direction indicated by the arrow Y is the right direction, and the opposite direction is the left direction. These arrows X, Y, and Z also have the same meaning in FIGS. 2-6.

  As shown in FIGS. 2, 4 and 5, the heat sink 4 includes a flat plate portion 20 and heat radiating fins 22. The flat plate portion 20 has a plate shape. In this embodiment, the flat plate portion 20 has a rectangular shape in a top view. A plurality of heat radiating fins 22 protrude downward from the lower surface of the flat plate portion 20. Each radiating fin 22 has a plate shape. The heat radiating fins 22 extend in the front-rear direction. A plurality of heat radiation fins 22 are juxtaposed in the left-right direction.

  The flat plate portion 20 and the radiation fins 22 are made of a metal having excellent thermal conductivity. Typical materials for the flat plate portion 20 and the radiation fins 22 are aluminum alloy and steel. In this embodiment, the flat plate portion 20 and the heat radiating fins 22 are integrally formed. The flat plate portion 20 and the heat radiating fins 22 may be formed separately. The flat plate portion 20 and the heat radiating fins 22 may be formed of different materials.

  The housing 6 has a box shape with the lower surface opened. The housing 6 is put on the inner surface of the heat sink 4. The housing 6 and the heat sink 4 form a housing 24 that houses the electrical element 10. The housing | casing 6 consists of a metal excellent in heat conductivity and electroconductivity. The housing 6 contributes to heat dissipation and electromagnetic noise shielding. The housing 6 may be made of an insulating and low thermal conductive material. For example, the housing 6 may be made of resin. The housing 6 made of resin contributes to cost reduction of the electronic device 2.

  The upper surface of the flat plate portion 20 of the heat sink 4 faces the inside of the container 24. This surface is referred to as the inner surface 26 of the heat sink 4. This opposite surface is referred to as the outer surface 28 of the heat sink 4. The front surface and the rear surface of the heat sink 4 are composed of an end surface of the flat plate portion 20 and end surfaces of the plurality of heat radiation fins 22. These are referred to as the end face 30 of the heat sink 4.

  The circuit board 8 is located on the inner side surface 26 of the heat sink 4. The circuit board 8 is laminated on the inner side surface 26 of the heat sink 4. Although not shown, the circuit board 8 has a pattern made of a conductive metal. Typically, the pattern is made of copper. Typically, the circuit board 8 is a glass epoxy board. As the circuit board 8, another board such as a paper phenol board may be used.

  The electrical element 10 is mounted on the circuit board 8. The electrical element 10 is mounted on the inner side surface 26 of the heat sink 4 via the circuit board 8. In FIG. 2, a transformer 10 a and a power transistor 10 b are shown as the electrical element 10. These electrical elements 10 generate heat when a large amount of current flows during operation. Although not shown, an element that hardly generates heat, such as a transistor for a control circuit, a resistor, or a capacitor, may be mounted on the circuit board 8.

  Although not shown, these electrical elements 10 are electrically connected to each other by the pattern of the circuit board 8. These are electrically connected to the connector 14 by a pattern. Thereby, a circuit having a desired function is configured. In this embodiment, a power conversion circuit is configured.

  FIG. 6 is a front view of the housing 6 as viewed from the front. As shown in FIGS. 2 and 6, the blower 12 is attached to the front surface of the housing 6. The blower 12 takes in the refrigerant into the housing 24 and sends out the refrigerant from the front to the rear. As shown in FIG. 3, the electrical element 10 is located almost in front of the rear side of the blower 12. The blower 12 sends the refrigerant toward the electrical element 10. The refrigerant is, for example, outside air.

  In this embodiment, the blower 12 is an axial flow blower. As shown in FIG. 6, the blower 12 has blades 32 inside. As the blades 32 rotate, the refrigerant is sent out. A two-dot chain line CW in FIG. 3 represents a direction in which the rotation axis of the blade 32 extends. This is referred to as the rotation axis direction CW. In this embodiment, the rotation axis direction CW is the front-rear direction. The refrigerant flows in substantially the same direction as the rotation axis direction CW.

  As shown in FIG. 2, the heat transfer cover 13 has an upper surface 34, a right surface 36, and a left surface 38. As shown in FIG. 5, the heat transfer cover 13 covers the electrical element 10 from the housing 6 side. In this embodiment, the heat transfer cover 13 covers the transformer 10a. The heat transfer cover 13 covers the upper surface, left surface, and right surface of the transformer 10a. A gap 40 is provided between the heat transfer cover 13 and the electrical element 10. An upper surface 34 of the heat transfer cover 13 is in contact with the housing 6. As can be seen from FIGS. 2 and 5, the heat transfer cover 13 is open at the front and rear surfaces. The heat transfer cover 13 includes an opening penetrating from the blower 12 side to the opposite side. The heat transfer cover 13 is made of a metal having excellent thermal conductivity. Typical materials for the heat transfer cover 13 are tin, aluminum alloy and steel.

  The connector 14 is attached to the front surface of the housing 6. In this embodiment, the input power connector 14 and the output power connector 14 are located on the front surface of the housing 6. The position of the connector 14 is not limited to the front surface of the housing 6. The connector 14 may be located on the left or right side or the rear side of the housing 6. The position of the connector 14 is appropriately determined depending on the situation where the electronic device 2 is used.

  As shown in FIGS. 3 and 4, the vent hole 16 is formed between the heat sink 4 and the housing 6. The air gap 16 is a gap provided between the rear surface of the housing 6 (the surface facing the surface where the blower 12 is located) and the end surface of the flat plate portion 20 of the heat sink 4. The vent hole 16 has a slit shape extending in the left-right direction. In this embodiment, the length of the vent hole 16 is substantially equal to the width of the heat sink 4 in the left-right direction. The vent hole 16 connects the inside and the outside of the container 24. The refrigerant is discharged to the outside through the vent hole 16.

  In the electronic device 2, the extending direction of the vent holes 16 is inclined with respect to the direction in which the blower 12 sends out the refrigerant. More specifically, when a plane that includes the center line of the slit-shaped vent hole 16 and is parallel to the direction in which the blower 12 sends out the refrigerant is the virtual reference plane, the plane is viewed from a direction perpendicular to the virtual reference plane. The extending direction of the vent hole 16 is inclined with respect to the direction in which the blower 12 sends out the refrigerant. In FIG. 3, a surface that generally includes the inner surface 26 of the heat sink 4 is a virtual reference surface. When viewed from a direction perpendicular to the virtual reference plane, the extending direction of the vent holes 16 is inclined with respect to the direction in which the blower 12 sends out the refrigerant. In this embodiment, the inclination angle with respect to the direction in which the blower 12 in the extending direction of the vent hole 16 sends out the refrigerant is approximately 90 °.

  In the electronic device 2, the extending direction of the vent hole 16 is inclined with respect to the rotation axis direction CW. That is, when the plane including the center line of the slit-like vent hole 16 and parallel to the rotation axis direction CW is a virtual reference plane, the extension of the vent hole 16 viewed from a direction perpendicular to the virtual reference plane is shown. The present direction is inclined with respect to the rotation axis direction CW. 3 is an angle formed by the rotation axis direction CW and the extending direction of the vent hole 16. In this embodiment, the angle θ is 90 °.

  As shown in FIG. 2, the guide plate 18 has a box shape with an open front surface and upper surface. The guide plate 18 includes a first surface 42, a second surface 44, a third surface 46, and a fourth surface 48.

  As shown in FIG. 4, the first surface 42 of the guide plate 18 faces the end surface 30 of the heat sink 4. The first surface 42 extends downward from the end 50 of the housing 6 on the vent 16 side. The first surface 42 extends along the end surface with a space between the first surface 42 and the end surface 30 of the heat sink 4. The second surface 44 of the guide plate 18 faces the outer surface 28 of the heat sink 4. The second surface 44 extends along the outer surface with a space between the end of the first surface 42 and the outer surface 28 of the heat sink 4. As shown in FIG. 1, the third surface 46 of the guide plate 18 faces the radiating fin 22 located at the right end of the heat sink 4. Although not shown, the fourth surface 48 of the guide plate 18 faces the heat radiating fins 22 located at the left end of the heat sink 4. The guide plate 18 covers the lower part of the rear side of the heat sink 4 (the direction opposite to the blower 12). The guide plate 18 is made of a metal having excellent thermal conductivity. Typical materials for the guide plate 18 are aluminum alloy and steel.

  In FIG. 4, the flow of the refrigerant is indicated by arrows. The refrigerant sent from the blower 12 to the inside of the container 24 passes through the vicinity of the electrical element 10. A part of the refrigerant passes between the electric element 10 and the heat transfer cover 13 from the front to the rear. The refrigerant passes through the vent hole 16 and enters the space between the guide plate 18 and the heat sink 4. The refrigerant passes through this space and is discharged outside. A part of the refrigerant flows along the outer surface 28 of the heat sink 4 even after leaving the space. That is, the guide plate 18 forms the space to send the refrigerant toward the outer surface 28 of the heat sink 4. The heat of the electric element 10 is released to the outside by the flow of the refrigerant. In the electronic device 2, an air cooling mechanism is realized by the blower 12, the heat sink 4, the housing 6, the heat transfer cover 13, and the guide plate 18.

  The electronic device 2 may not include the heat transfer cover 13. The electronic device 2 may not include the guide plate 18. The air cooling mechanism of the electronic device 2 may be realized by the blower 12, the heat sink 4, and the housing 6. In this case, the refrigerant is discharged directly from the vent hole 16.

  Hereinafter, the function and effect of the present invention will be described.

  In the electronic device 2 with an air cooling mechanism according to the present invention, the refrigerant sent from the blower 12 to the inside of the housing body 24 passes around the electrical element 10 and is discharged from the vent hole 16. By this flow, the heat of the electrical element 10 is taken away by the refrigerant and released to the outside air together with the refrigerant. The vent hole 16 has a slit shape, and the extending direction of the vent hole 16 is inclined with respect to the direction in which the blower 12 sends out the refrigerant. By making the shape of the vent hole 16 into a slit shape and inclining the extending direction with respect to the direction in which the blower 12 sends out the refrigerant, the width of the vent hole 16 viewed from the direction in which the refrigerant flows can be increased. Even if the flow of the refrigerant is disturbed by the electric element 10 or the like, the refrigerant can be efficiently discharged from the vent hole 16. In the electronic device 2, the refrigerant is prevented from staying inside the container 24. The heat from the electrical element 10 is effectively discharged outside. Moreover, the structure of the electronic device 2 is simple. In the electronic device 2, effective cooling is realized with a simple structure.

  In the electronic device 2, the electrical element 10 is mounted on the inner surface of the heat sink 4. The heat of the electrical element 10 is conducted to the heat sink 4 and released from the heat sink 4 to the outside. The heat sink 4 effectively releases heat from the electrical element 10 to the outside air. In the electronic device 2, effective cooling is realized with a simple structure by the flow of the refrigerant and the heat sink 4.

  The angle θ formed by the rotation axis direction CW and the extending direction of the vent hole 16 is preferably 60 ° or more and 120 ° or less. By setting the angle θ to 60 ° or more and 120 ° or less, the width of the vent hole 16 viewed from the direction in which the refrigerant flows can be effectively increased. Even if the refrigerant flow is disturbed, the refrigerant can be efficiently discharged from the vent hole 16. In the electronic device 2, the refrigerant is prevented from staying inside the container 24. In this respect, the angle θ is more preferably 80 ° or greater and 100 ° or less, and even more preferably 90 °.

  As shown in FIG. 3, the blower 12 sends the refrigerant from the front to the rear. The electrical element 10 is located behind the blower 12, and the vent hole 16 is located further behind the blower 12. Thus, the electrical element 10 is preferably located in the downstream direction of the refrigerant flow as viewed from the blower 12, and the vent hole 16 is preferably located in the further downstream direction of the electrical element 10. By positioning the blower 12, the electrical element 10, and the vent hole 16 in this manner, the refrigerant that has taken heat from the electrical element 10 is prevented from staying in the container 24. The refrigerant can efficiently release the heat of the electrical element 10 to the outside air. In the electronic device 2, effective cooling is realized.

  As described above, the electronic device 2 includes the heat transfer cover 13 that covers the electrical element 10. The heat transfer cover 13 is made of a metal having excellent heat conductivity. Heat from the electrical element 10 is effectively transferred to the heat transfer cover 13. An upper surface 34 of the heat transfer cover 13 is in contact with the housing 6. The heat transmitted to the heat transfer cover 13 is transmitted to the housing 6 and released from the housing 6. The heat transfer cover 13 contributes to effective heat dissipation from the electrical element 10. Furthermore, this heat transfer cover 13 has a gap 40 between the electrical element 10. The heat transfer cover 13 has an opening penetrating from the blower 12 side to the opposite side. The refrigerant sent from the blower 12 passes around the electrical element 10 through the opening and the gap 40. The heat transfer cover 13 is unlikely to obstruct the refrigerant flow around the electrical element 10. This refrigerant can effectively remove heat from the electrical element 10. In the electronic device 2, effective cooling is realized.

  As described above, the electronic device 2 includes the guide plate 18 that extends along the end surface 30 and the outer side surface 28 of the heat sink 4 from the end 50 on the air vent 16 side of the housing 6 with a space between the electronic device 2 and the heat sink 4. have. The refrigerant that has passed through the vent hole 16 passes through this space and is discharged to the outside. At this time, the refrigerant removes heat from the outer surface 28 of the heat sink 4. A part of the refrigerant flows along the outer surface 28 of the heat sink 4 even after leaving the space. This refrigerant also takes heat away from the outer surface 28 of the heat sink 4 at this time. The refrigerant takes heat directly from the electric element 10 inside the housing 24 and further takes heat transferred from the electric element 10 to the heat sink 4 from the outer surface 28 of the heat sink 4. In the electronic device 2, the heat from the electrical element 10 is effectively radiated. Moreover, this cooling mechanism is simple. In the electronic device 2, effective cooling is realized with a simple structure.

  As shown in FIG. 4, in this embodiment, the guide plate 18 extends further forward than the electrical element 10 in the front-rear direction. A guide plate 18 covers an outer surface 28 of the heat sink 4 outside the electric element 10 through the heat sink 4. That is, a space formed by the outer surface 28 of the heat sink 4 and the guide plate 18 exists outside the electric element 10 through the heat sink 4. The heat transferred from the electric element 10 to the heat sink 4 is effectively released by the refrigerant flowing through this space. In the electronic device 2, the heat from the electrical element 10 is effectively radiated.

  Although not shown, the guide plate 18 may not cover the outer surface 28 of the heat sink 4 outside the electric element 10 through the heat sink 4. In this case, the guide plate 18 does not extend further forward than the electrical element 10 in the front-rear direction. In the front-rear direction, the front end of the guide plate 18 is located behind the electrical element 10. By doing so, the periphery of the outer surface 28 of the heat sink 4 is widely opened outside the electrical element 10. For this reason, the heat released from the outer surface 28 of the heat sink 4 is less likely to stay near the outer surface 28 of the heat sink 4. This contributes to heat dissipation from the outer surface 28 of the heat sink 4. In the electronic device 2, the heat from the electrical element 10 is effectively radiated.

  In FIG. 3, one of the plurality of heat radiation fins 22 is indicated by a dotted line. As shown in FIGS. 2 and 3, the heat radiation fins 22 of the respective heat sinks 4 extend in the front-rear direction (the direction from the blower 12 side to the vent hole 16 side). The extending direction of the heat radiating fins 22 is substantially orthogonal to the extending direction of the vent holes 16. Thus, it is preferable that the extending direction of the radiating fins 22 is inclined with respect to the extending direction of the vent holes 16. As shown in FIG. 4, the refrigerant that has flowed from the blower 12 to the vent hole 16 flows along the outer surface 28 of the heat sink 4 after passing through the vent hole 16. If the extending direction of the radiating fins 22 is parallel to the extending direction of the vent holes 16, the radiating fins 22 are likely to obstruct the flow of the refrigerant. By inclining the extending direction of the heat radiating fins 22 with respect to the extending direction of the vent holes 16, the refrigerant easily flows along the outer surface 28 of the heat sink 4. This contributes to efficient heat dissipation from the heat sink 4.

  In FIG. 3, the angle α is an angle formed by the extending direction of the radiating fins 22 and the extending direction of the vent holes 16. Specifically, this is an angle formed by the extending direction of the heat dissipating fins 22 and the extending direction of the vent holes 16 when viewed from the direction perpendicular to the outer surface of the heat sink. The angle α is preferably 80 ° or more and 100 ° or less. By setting the angle α to 80 ° or more and 100 ° or less, the direction in which the refrigerant flows on the outer surface 28 of the heat sink 4 and the extending direction of the radiation fins 22 are substantially parallel. The refrigerant can flow more smoothly along the radiation fins 22. This contributes to efficient heat dissipation from the heat sink 4. From this viewpoint, the angle α is more preferably 85 ° to 95 °, and further preferably 90 °.

  In the embodiment described above, the blower 12 is an axial blower. Although not shown, the blower may be a centrifugal blower. In this case, in this electronic device, the extending direction of the air holes is inclined with respect to a direction (referred to as the air blowing axis direction) perpendicular to the air blowing port of the centrifugal blower.

  In this case, the angle θ formed by the blowing shaft direction and the extending direction of the air holes is preferably 60 ° or more and 120 ° or less. By setting the angle θ to 60 ° or more and 120 ° or less, it is possible to effectively increase the width of the vent hole as viewed from the direction in which the refrigerant flows. Even if the refrigerant flow is disturbed, the refrigerant can be efficiently discharged from the vent hole. In this electronic device, the refrigerant is prevented from staying inside the container. In this respect, the angle θ is more preferably 80 ° or greater and 100 ° or less, and even more preferably 90 °.

  Although not shown, the blower may be a mixed flow blower. In this electronic apparatus, the extending direction of the pores is inclined with respect to the direction in which the rotating shaft of the blade of the mixed flow fan extends.

  FIG. 7 is a cross-sectional view illustrating an electronic device 62 with an air cooling mechanism according to another embodiment of the present invention. FIG. 7 shows a heat sink 64, a housing 66, a circuit board 68, an electrical element 70, and a heat transfer cover 72 of this electronic apparatus. The electrical element 70 is a transformer 70a. The electronic device 62 is the same as the electronic device 2 of FIGS. 1-6 except for the heat transfer cover 72. The direction of the arrow Y in FIG. 7 is the right direction of the electronic device 62, and the opposite direction is the left direction. The direction of the arrow Z is the upward direction, and the opposite direction is the downward direction.

  As shown in FIG. 7, in this embodiment, the heat transfer cover 72 covering one of the adjacent transformers 70a and the heat transfer cover 72 covering the other transformer 70a are connected. Thus, it is preferable that the plurality of heat transfer covers 72 are connected. Depending on the operating state of the electronic device 62, one electrical element 70 may generate a large amount of heat, and another electrical element 70 may generate little heat. By connecting the plurality of heat transfer covers 72, heat from the electrical element 70 that generates a large amount of heat is also transmitted to the heat transfer cover 72 that covers the other electrical elements 70 through the heat transfer cover 72 that covers the heat transfer cover 72. This contributes to effective heat dissipation. Further, the difference in temperature rise between the electrical element 70 that generates a large amount of heat and the electrical element 70 that generates a smaller amount of heat can be reduced. In this electronic device 62, a local temperature rise is suppressed.

  The shape of the heat transfer cover is not limited to that shown in FIGS. For example, the left and right sides of the heat transfer cover may be bent. The left and right surfaces may have irregularities. The heat transfer cover only needs to include an opening that covers the electrical element from the housing surface side and penetrates from the blower side to the opposite side.

  When the casing is made of metal, the casing and the heat transfer cover may be integrally formed. When the casing is made of metal, the electronic apparatus may not be provided with the heat transfer cover, and the casing may be bent to perform the function of the heat transfer cover. For example, the housing may be bent downward on the left and right sides of the electrical element, and the bent portions may cover the right and left surfaces of the electrical element.

  As described above, according to the present invention, an electronic device with an air cooling mechanism in which effective cooling is realized with a simple structure can be obtained. From this, the superiority of the present invention is clear.

  The electronic device with an air cooling mechanism described above is used for various devices including automobiles.

2, 62 ... Electronic equipment 4, 64 ... Heat sink 6, 66 ... Housing 8, 68 ... Circuit board 10, 70 ... Electrical elements 10a, 70a ... Transformer 10b ... Power transistor 12 ... Blower 13, 72 ... Heat transfer cover 14 ... Connector 16 ... Vent hole 18 ... Guide plate 20 ... Plate portion 22 ... Heat radiation fin 24 ... Housing 26 ... Heat sink inner surface 28 ... Heat sink outer surface 30 ... Heat sink end surface 32 ... Blade 34 ... Upper surface 36 ... Right surface 38 ... Left surface 40 ... Gap 42 ... 1st surface 44 ... 2nd surface 46 ... 3rd surface 48 ... 4th surface 50 ... End of the ventilation hole side of a housing | casing

Claims (7)

A heat sink, an electrical element mounted on the inner surface of the heat sink, a housing forming a housing for housing the electrical element together with the heat sink, a blower for sending a refrigerant into the housing, and the housing from the housing With vents to discharge the refrigerant,
The electronic device with an air cooling mechanism, wherein the vent hole is slit-shaped and an extending direction of the vent hole is inclined with respect to a direction in which the blower sends out the refrigerant. The blower is an axial blower,
2. The electronic device with an air cooling mechanism according to claim 1, wherein an angle θ formed by a direction in which a rotating shaft of a blade of the axial flow fan extends and an extending direction of the vent hole is 60 ° or more and 120 ° or less.   The electronic device with an air cooling mechanism according to claim 2, wherein the angle θ is not less than 80 ° and not more than 100 °. The blower is a centrifugal blower,
2. The electronic device with an air cooling mechanism according to claim 1, wherein an angle formed between a direction perpendicular to the blower opening of the centrifugal blower and an extending direction of the vent hole is 60 ° or more and 120 ° or less.   The electronic device with an air cooling mechanism according to any one of claims 1 to 4, further comprising a guide plate that sends the refrigerant that has passed through the vent hole to an outer surface of the heat sink. The heat sink has a flat plate portion that constitutes the inner surface on one surface of which the electrical element is mounted, and a plurality of plate-like heat dissipations that protrude outward from the other surface of the flat plate portion and extend along the surface. With fins,
The electronic device with an air cooling mechanism according to claim 5, wherein an angle α formed by the extending direction of the heat dissipating fins and the extending direction of the vent holes is 80 ° or more and 100 ° or less. A heat transfer cover that covers the electrical element from the housing side with a gap between the electrical element and the electrical element;
The electronic device with an air cooling mechanism according to any one of claims 1 to 6, wherein the heat transfer cover has an opening penetrating from the blower side to the opposite side.

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