JP2011135649A - Inverter device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inverter device that can improve the efficiency of heat exchange at the downstream side of an air flow, and can perform effective cooling. <P>SOLUTION: The inverter device includes a substrate 17 assembled with a plurality of electronic components 15, a base plate 21 which is arranged adjacent to a switch module 19 having a large internal heat generation amount in the electronic components 15; a heat dissipation fin part 27 which is arranged almost in parallel with the lower surface 23 at the opposite side with respect to the substrate 17 of the base plate 21, and has a plurality of lower-side fins 25 which form a plurality of closed fluid passages, and fans 29 which are arranged so as to oppose one-side ends of the closed fluid passages and feed air in air flow directions along the closed fluid passages. In the heat dissipation fin part 27, there are arranged in the air flow directions a plurality of merging points which merge the plurality of closed fluid passages in directions intersecting with the air flow directions, and a distance between the merging points is narrowed more than the other part in the vicinity of the switch module 19. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an inverter device.

An inverter that is a power converter that electrically generates AC power from DC power, or a power conversion device having the circuit, has recently been used as an inverter device combined with a control device or the like, for example, to a motor control device, a power supply device, or the like. The field of use is expanding.
In general, an inverter device uses a switch module that generates high heat, such as an insulated gate bipolar transistor (IGBT) or an integral power module (IPM). In order to prevent adverse effects on other electronic components due to this heat generation, for example, the switch module is cooled by being in close contact with a heat sink.

  For example, as shown in Patent Document 1, the heat sink includes a base plate portion mounted so that the switch module is in close contact with one surface side, and a plurality of heat sinks attached in parallel provided on the other surface of the base plate portion. It consists of fins. A fan arranged to face the heat sink is configured to send cooling air between the fins. The cooling air sent by the fan removes heat from the base plate portion and the fins with which the fan comes into contact, so that the heat generated by the switch module is dissipated.

JP 2008-177314 A

  By the way, in what is shown by patent document 1, since the fin is made into the uniform structure toward the flow direction of air, the airflow from a fan will be rectified with advancing. When the air flow is rectified, the air in contact with the fins and the base plate becomes constant, and the temperature of this air rises sequentially, so the temperature difference between the fins and the base plate and the air is reduced, and the efficiency of heat exchange Decreases. In particular, effective cooling cannot be performed when a heat generating component such as a switch module is disposed on the downstream side.

  In view of such circumstances, an object of the present invention is to provide an inverter device capable of improving the efficiency of heat exchange on the downstream side of an air flow and performing effective cooling.

In order to solve the above problems, the present invention employs the following means.
That is, according to one embodiment of the present invention, a substrate in which a plurality of electronic components are incorporated, a base plate portion disposed adjacent to a heat generating component having a large internal heat generation amount of the electronic component, and the substrate of the base plate portion The heat dissipating fin portion having a plurality of first fins forming a plurality of fluid passages is provided so as to be substantially parallel to one surface on the opposite side, and is disposed opposite one end portion of the fluid passage, And a fan for supplying fluid in a fluid flow direction along the fluid passage, wherein the plurality of fluid passages are combined in the radiating fin portion in a direction intersecting the fluid flow direction. In the inverter device, a plurality of joining portions are provided in the fluid flow direction, and a distance between the joining portions is smaller in the vicinity of the heat generating component than in other portions.

In the inverter device according to this aspect, the heat generated by the heat generating component is transmitted to the heat dissipating fin portion constituted by the adjacent base plate portion and a plurality of first fins attached to one surface of the base plate portion, and the base plate portion. And the temperature of the radiating fin is raised. A fluid flow generated by the fan, eg, an air flow, flows through a fluid passage formed by the plurality of first fins. The fluid, for example, air, flowing through the fluid passage takes heat from the base plate portion and the heat radiating fin portion by heat exchange with the base plate portion and the heat radiating fin portion, and cools them.
At this time, since the radiating fin portion is provided with a merging portion that merges a plurality of fluid passages in a direction intersecting the fluid flow direction, the member that guides the fluid flowing through the fluid passage at the merging portion is interrupted. . When there is no guide member, the fluids flowing through the fluid passages try to flow into the adjacent fluid passages, and thus collide with each other at the boundary portion. As a result, the flow of the fluid flowing through the fluid passage is disturbed, in other words, turbulent flow, so that the position of the fluid flowing in the cross section of the fluid passage can be changed.

Since the fluctuation of the fluid flow position in the cross section of the fluid passage remains in the fluid passage past the joining portion, the fluid in contact with the base plate portion and the radiating fin portion in this portion is heated by heat exchange. Therefore, the efficiency of heat exchange can be improved, and effective cooling can be performed.
The fluid flowing in the fluid passage is rectified after a while after the merging portion, but in this aspect, since a plurality of merging portions are provided in the fluid flow direction, the fluid is turbulent each time it passes through each merging portion. The Thereby, the efficiency of the whole heat exchange can be improved and effective cooling can be performed.
In addition, since the distance between the joining portions is smaller in the vicinity of the heat-generating component than in the other portions, the heat exchange efficiency in the base plate portion and the heat radiation fin portion having a relatively high temperature in the vicinity of the heat-generating component should be improved. Effective cooling can be performed.

  In the aspect, at least the joining portion located in the vicinity of the heat generating component may be provided so as to be inclined with respect to the fluid flow direction so that the heat generating component side is positioned on the downstream side.

In this way, the fluid can flow toward the heat generating component at the junction, so that more fluid can flow to the base plate portion and the heat radiating fin portion having a relatively high temperature in the vicinity of the heat generating component. .
Therefore, the heat exchange efficiency in the base plate portion and the heat radiating fin portion having a relatively high temperature in the vicinity of the heat generating component can be improved, and effective cooling can be performed.

In the aspect, a fin cover that covers the free end sides of the plurality of first fins may be provided, and the fluid passage may be a sealed fluid passage that is sealed around the periphery.
In this case, it is preferable that the sealed fluid passage has a reduced cross-sectional area in the vicinity of the heat generating component.

  As described above, when the sealed fluid passage has a reduced cross-sectional area in the vicinity of the heat generating component, the flow velocity of the fluid increases in the vicinity of the heat generating component, so that the amount of the fluid contacting per unit time can be increased. Increasing the amount of fluid contacted per unit time increases the amount of heat exchange, which can improve the heat exchange efficiency in the base plate and radiating fins that have relatively high temperatures in the vicinity of the heat-generating components. Effective cooling can be performed.

  In the above aspect, the heat radiating fin portion may include a plurality of second fins that radiate heat on the other surface of the base plate portion on the substrate side.

  If it does in this way, since a thermal radiation area will increase by the 2nd fin also on the other side, heat exchange efficiency can be improved and effective cooling can be performed.

  In the said aspect, the said heat-emitting component may be attached so that it may fit in the said base board part.

If it does in this way, since the heat transfer area from a heat-emitting component to a base board part increases, more heat quantity can be transmitted to a base board part from a heat-generating part. Moreover, since the heat transfer path | route transmitted to the 2nd fin from the side surface of a heat-emitting component is formed, the heat transfer to a 2nd fin can be increased.
As a result, the heat exchange efficiency in the base plate portion and the radiation fin portion can be improved, and effective cooling can be performed.

  In the aspect described above, a cover may be provided that covers the other surface of the base plate side including the substrate in which the electronic component is incorporated.

  If it does in this way, since the board | substrate in which the electronic component was integrated will be located in the space closed by the base board part and the cover, an inverter apparatus can be installed in the open space. Therefore, the installation location of the inverter device can be freely set, so that the range to be used can be expanded.

  In the above configuration, it is preferable that the cover includes a plurality of third fins attached so as to penetrate in the thickness direction.

  If it does in this way, since the thermal radiation area over the space in a cover can be improved with the 3rd fin, an inverter device can be cooled effectively.

According to the present invention, since the radiating fin portion is provided with a merging portion that combines a plurality of fluid passages in a direction intersecting the fluid flow direction, the efficiency of heat exchange can be improved and effective cooling can be achieved. It can be performed.
Since a plurality of the merging portions are provided in the fluid flow direction, the fluid is turbulent each time it passes through each merging portion, so that the overall heat exchange efficiency can be improved and effective cooling is performed. be able to.
Since the distance between each merged part is smaller in the vicinity of the heat-generating component than in the other parts, the heat exchange efficiency in the base plate part and the heat radiation fin part, which are relatively high in the vicinity of the heat-generating part, can be improved. Effective cooling can be performed.

1 is a side block diagram showing a schematic configuration of a truck on which an inverter device according to a first embodiment of the present invention is installed. It is a perspective view which shows the inverter apparatus and heat shield of FIG. It is XX sectional drawing except the heat shield of FIG. It is YY sectional drawing of FIG. It is ZZ sectional drawing of FIG. It is an enlarged view which expands and shows the A section of FIG. It is sectional drawing of the part similar to FIG. 4 which shows another embodiment of the inverter apparatus concerning 1st embodiment of this invention. It is sectional drawing of the part similar to FIG. 4 which shows another embodiment of the inverter apparatus concerning 1st embodiment of this invention. It is a perspective view which shows the inverter apparatus concerning 2nd embodiment of this invention. FIG. 10 is a cross-sectional view taken along the line U-U in FIG. 9. It is VV sectional drawing of FIG. It is WW sectional drawing of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[First embodiment]
Hereinafter, an inverter device 1 used as a motor control device of an electric compressor of a refrigeration apparatus for land transportation according to a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a side block diagram showing a schematic configuration of a truck 3 on which an inverter device 1 according to the first embodiment is installed.

A cool box 5 that forms a cooling space is mounted on the loading platform of the truck 3.
The land transport refrigeration apparatus 7 is installed, for example, in the upper part of the front part of the cold storage 5. Although not shown, the refrigeration apparatus 7 for land transportation is provided with a refrigeration circuit that circulates the refrigerant by an electric compressor and cools the inside of the cool box 5 by a change in the state of the refrigerant.
The inverter device 1 as a control device for driving the electric compressor and the battery 9 as a power source are attached to the lower part of the loading platform of the truck 3, for example.
The inverter device 1 is attached to a released space, and a heat shield plate 11 that blocks radiant heat from the road surface 13 is provided below the inverter device 1.

  FIG. 2 is a perspective view showing the inverter device 1 and the heat shield plate 11. FIG. 3 is a cross-sectional view taken along the line XX excluding the heat shield plate 11 shown in FIG. 4 is a YY cross-sectional view of FIG. FIG. 5 is a ZZ cross-sectional view of FIG. FIG. 6 is an enlarged view showing an A portion of FIG.

The inverter device 1 includes a substrate 17 on which various electronic components 15 are mounted, a switch module (heat generating component) 19, a base plate (base plate portion) 21 that is mounted so that the switch module 19 is fitted therein, and a base plate. A heat dissipating fin portion 27 having a plurality of lower fins (first fins) 25 attached so as to be substantially parallel to a lower surface (one surface) 23 of 21 and an end portion of the heat dissipating fin portion 27. A fan 29 and a cover 33 that covers the upper surface (other surface) 31 of the base plate 21 including the substrate 17 are provided.
Since the fan 29 is used outdoors, it is a dustproof and waterproof specification.

As the switch module 19, for example, an integrated gate bipolar transistor (IGBT), or a control signal amplification circuit, a protection circuit such as a current / voltage / temperature centered on the IGBT, a free-wheeling diode, etc. contained in one package. A power module (IPM) is used.
As shown in FIG. 4, the switch module 19 is on the downstream side (right side in FIG. 4) of the air flow direction (fluid flow direction) L formed by the fan 29 in the substrate 17 and on the right side (lower side in FIG. 4). Is attached to.

The base plate 21 is a thick metal plate having good heat conductivity. The lower fin 25 is made of a plate-like metal, and one long side is fixedly attached to the base plate 21. The lower fins 25 may be formed integrally with the base plate 21 by die casting or extrusion, or may be formed separately, attached to the base plate 21 by caulking, brazing, or the like.
The front end portion (free end side) of the lower fin 25 is curved so that the height along the air flow direction L is minimized immediately before the switch module 19.

The tips of all the lower fins 25 are covered with a fin cover 35. The fin cover 35 is a plate material that is curved so as to follow the curved shape of the tip portion of the lower fin 25.
The lower fins 25 are attached at substantially equal intervals in the width direction (a direction substantially perpendicular to the air flow direction L), and a sealed fluid passage (fluid) whose periphery is sealed by the adjacent lower fins 25 and the fin cover 35. A passage) 37 is formed.
Therefore, the cross-sectional area of the sealed fluid passage 37 is reduced in the vicinity of the switch module 19.

  The fin cover 35 is attached according to conditions, and may be omitted to form an unsealed fluid passage. In this case, it is preferable that the height of the heat transfer area is increased by making the height of the front end portion of the lower fin 25 equal to or higher than that of the other in the vicinity of the switch module 19.

  In the lower fin 25, slit portions 39 are formed at a plurality of locations along the air flow direction L, for example, at three locations over the entire height of the lower fin 25. The slit portion 39 is formed so that the lower fin 25 adjacent to the right side with respect to the air flow direction L is located downstream of the air flow direction L. Thereby, as shown in FIG. 4, the sealed fluid passages 37 communicate with each other, that is, a merged portion 41 in which all the sealed fluid passages 37 are combined (hereinafter, when it is necessary to specify a difference in position, Suffixes a, b, and c are added to distinguish them.).

The merging portion 41 is inclined with respect to the air flow direction L on the downstream side of the air flow direction L of the substrate 17, which is the mounting position of the switch module 19, and toward the right side (in a direction crossing the air flow direction L). Extended). Therefore, the junction part 41 is formed so that the switch module 19 side is located on the downstream side.
The interval between the merging portions 41 a and 41 b located before and after the switch module 19 is set to be smaller than the interval between the merging portions 41 b and 41 c located away from the switch module 19. That is, the distance between the merging portions 41 is smaller in the vicinity of the switch module 19 than the other portions. In other words, the junction portion 41 is installed so that the pitch becomes smaller in the vicinity of the switch module 19.

In addition, in this embodiment, although the confluence | merging part 41 is formed so that it may incline in one direction with respect to the air flow direction L, it is not limited to this.
For example, the merging portion 41 may be formed so as to be substantially orthogonal to the air flow direction L as shown in FIG.
Further, as shown in FIG. 8, when the switch module 19 is at a substantially central position in the width direction, the joining portion 41 is located at the most downstream side toward the downstream side in the air flow direction L. You may form so that a chevron may be formed. Furthermore, you may make it provide the junction part 41 in a part of width direction, without providing in full width.

  The slit 37 may be processed after the lower fin 25 is attached, or may be formed by attaching a plurality of plate-like bodies at intervals. When processing after attachment, for example, it can be formed easily and inexpensively by wire cutting using electric discharge machining.

The cover 33 has, for example, a box shape in which one metal surface is released, and is attached to the base plate 21 so as to cover the upper surface 31 including the substrate 17. The substrate 17 is sealed with the cover 33 and the base plate 21.
Thus, since the board | substrate 17 will be located in the space closed by the baseplate 21 and the cover 33, it can install the inverter apparatus 1 in the open space (lower part of a loading platform like this embodiment). it can. Therefore, since the installation place of the inverter apparatus 1 can be set freely, the range to be used can be expanded.

On the upper surface of the cover 33, there are provided heat radiating fins (third fins) 43 arranged in parallel so as to extend in the air flow direction L over substantially the entire length.
The radiating fins 43 are attached so as to penetrate in the thickness direction of the cover 33. In other words, the radiation fins 43 are continuously present inside and outside the cover 33. Thereby, the heat inside the cover 33 can be absorbed and radiated to the outside. The radiating fins 43 constitute the radiating fin portions 27.

The cooling operation of the inverter device 1 according to the present embodiment configured as described above will be described.
The heat generated by the switch module 19 is transmitted from the contact surface between the switch module 19 and the base plate 21 to the base plate 21 and further transmitted from the base plate 21 to the lower fins 25 attached to the lower surface 23 thereof. The fin 25 is heated. Further, the heat generated by the switch module 19 is transmitted to the air, and the temperature of the inside of the cover 33 is increased.

Since the switch module 19 is fitted into the base plate 21, in other words, attached so as to be dug, the heat transfer area from the switch module 19 to the base plate 21 can be increased. Thereby, a larger amount of heat can be transmitted from the switch module 19 to the base plate 21.
In addition, the switch module 19 may be attached so that it may contact instead of fitting in the baseplate 21. FIG.

The air flow 45 generated by the fan 29 flows through the sealed fluid passage 37 formed by the plurality of lower fins 25 and the fin cover 35. The air flowing through the sealed fluid passage 37 takes heat from the base plate 21 and the lower fin 25 by heat exchange with the base plate 21 and the lower fin 25, and cools them.
In order to increase the heat dissipation effect, for example, silver powder may be sprayed on the lower surface 23 and / or the surface of the lower fin 25 of the base plate 21 to increase the heat dissipation area.

At this time, the air flow 45 from the fan 29 is in a turbulent state near the inlet of the sealed fluid passage 37, but is rectified while flowing downstream for a while. The rectified air flow 45 flows with almost no change in the position of air movement in the cross section of the sealed fluid passage 37.
When the rectified air flow 45 enters the merging portion 41, the lower fins 25 that have guided the side surfaces are not interrupted, so that the air flows 45 tend to flow to the adjacent sealed fluid passage 37 as shown in FIG. The air flow 45 flowing through the sealed fluid passage 37 is disturbed by the turbulence caused by the flow into the adjacent area and the mutual flow, and in other words, the air flow 45 is turbulent.

Since the turbulent air flow 45 flows into the subsequent sealed fluid passage 37, the flow position of the air in the transverse section of the sealed fluid passage 37 can be changed in the merging portion 41 and the subsequent sealed fluid passage 37. it can.
In this portion, the air that contacts the base plate 21 and the lower fin 25 is replaced with air that has not been heated by heat exchange, so that the efficiency of heat exchange can be improved and effective cooling can be achieved. It can be carried out.

  After a while after the junction 41, the air flow 45 flowing through the sealed fluid passage 37 is rectified, but this is repeated at the next junction 41. As described above, since the merging portions 41 are provided in plural, for example, three locations along the air flow direction L, the air flow 45 is turbulent each time it passes through each merging portion 41. Thus, since the efficiency of heat exchange can be improved every time it passes through the junction part 41, the efficiency of the whole heat exchange can be improved and effective cooling can be performed.

  In addition, since the interval between the junction portions 41a and 41b located before and after the switch module 19 is made smaller than the interval between the junction portions 41b and 41c located away from the switch module 19, the switch module 19 The heat exchange efficiency in the base plate 21 and the lower fin 25 having relatively high temperatures in the vicinity can be improved, and effective cooling can be performed.

  In addition, since the merging portion 41 is provided so as to be inclined with respect to the air flow direction 45 so that the switch module 19 side is positioned on the downstream side, the merging portion 41 has an air flow indicated by a one-dot chain line in FIG. 47 occurs. This air flow 47 allows more air to flow to the base plate 21 and the lower fins 25 that have a relatively high temperature in the vicinity of the switch module 19. Therefore, the heat exchange efficiency in the base plate 21 and the lower fin 25 having a relatively high temperature in the vicinity of the switch module 19 can be improved, and effective cooling can be performed.

Since the tip of the lower fin 25 is curved so that the height along the air flow direction L is minimized immediately before the switch module 19, the sealed fluid passage 37 is located near the switch module 19. The cross-sectional area gradually decreases until reaching a minimum in the vicinity of the switch module 19 and then increases gradually.
Thus, since the cross-sectional area of the sealed fluid passage 37 is reduced in the vicinity of the switch module 19, the flow velocity of the air flow 45 is increased in the vicinity of the switch module 19. When the flow velocity of the air flow 45 increases, the amount of air that contacts the base plate 21 and the lower fin 25 per unit time can be increased.

When the amount of air that contacts per unit time increases, the amount of heat exchange between the base plate 21 and the lower fin 25 and the air increases, so that the base plate 21 and the lower fin 25 that have a relatively high temperature in the vicinity of the switch module 19. The heat exchange efficiency can be improved and effective cooling can be performed.
The cross-sectional area of the sealed fluid passage 37 is increased in order to reduce the pressure loss except in the vicinity of the switch module 19 where it is desired to increase the heat exchange amount relatively. Further, in consideration of pressure loss, the cross-sectional area of the sealed fluid passage 37 is prevented from changing rapidly.

Of the amount of heat generated by the switch module 19, the amount of heat transferred to the air inside the cover 33 is absorbed by the portion located inside the cover 33 of the radiating fin 43 and the inner surface of the cover 33. Heat is radiated to the outside air from a portion located outside of 33 and the outer surface of cover 33. Thereby, the internal air of the cover 33 is cooled.
Thus, since the heat radiation fin 43 can increase the heat radiation area to the outside of the heat in the space in the cover 33, the inverter device 1 can be effectively cooled.
In order to increase the heat dissipation effect, for example, silver powder may be sprayed on the surface of the cover 33 and / or the surface of the heat dissipation fin 43 to increase the heat dissipation area.

[Second Embodiment]
Next, the inverter apparatus 1 concerning 2nd embodiment of this invention is demonstrated using FIGS. 9-12. The inverter device 1 according to the present embodiment is used as a motor control device of an electric compressor of a refrigeration apparatus for land transportation, and is installed in a sealed space in a vehicle by a bus or the like, for example.
In the present embodiment, the cover 33 is not provided in relation to the installation location, and the configuration of the parts related to this is different from that of the first embodiment. A duplicate description of the same parts as those of the embodiment is omitted.
In addition, the same code | symbol is attached | subjected to the same member as 1st embodiment.

FIG. 9 is a perspective view showing the inverter device 1. 10 is a cross-sectional view taken along the line U-U in FIG. 9. 11 is a cross-sectional view taken along the line VV in FIG. 12 is a cross-sectional view taken along the line WW in FIG.
Since the inverter device 1 according to the present embodiment is installed in a sealed space, the cover 33 that covers the substrate 17 is not provided, and the substrate 17 is exposed.
A plurality of upper fins (second fins) 49 are attached to the upper surface 31 of the base plate 21 so as to extend in substantially the same direction as the lower fins 25 and to be attached substantially in parallel.

The upper fin 49 is a substantially rectangular metal plate, and one long side is fixedly attached to the upper surface 31 of the base plate 21. The upper fin 49 may be formed integrally with the base plate 21 by die casting or extrusion, or may be formed separately, attached to the base plate 21 by caulking, brazing, or the like.
The upper fin 49 is cut out at a position where a member such as the switch module 19 is present.
The upper fins 49 are attached at substantially equal intervals in the width direction, and the fluid passage 51 is formed by the adjacent upper fins 49.

The fan 29 is larger than the first embodiment so that the upper height position is equal to or higher than the upper end portion of the upper fin 49.
Since the inverter device 1 is installed in a sealed space, the fins 29 need not be waterproof and dustproof as in the first embodiment.

The cooling operation of the inverter device 1 according to the present embodiment configured as described above will be described.
The heat generated by the switch module 19 is transmitted from the contact surface between the switch module 19 and the base plate 21 to the base plate 21, and further, the lower fin 25 attached to the lower surface 23 from the base plate 21 and the upper fin attached to the upper surface 31. 49. Thereby, the temperature of the base plate 21, the lower fin 25, and the upper fin 49 is increased.

At this time, since the switch module 19 is fitted into the base plate 21, in other words, attached so as to be dug, the heat transfer area from the switch module 19 to the base plate 21 can be increased. Thereby, a larger amount of heat can be transmitted from the switch module 19 to the base plate 21.
Further, since a heat transfer path for transferring heat from the side surface of the switch module 19 to the upper fin 49 is formed, the amount of heat transfer to the upper fin 49 can be increased.
In addition, the switch module 19 may be attached so that it may contact instead of fitting in the baseplate 21. FIG.

An air flow 45 generated by the fan 29 flows through the sealed fluid passage 37 and the fluid passage 51, and heat is exchanged with the base plate 21, the lower fin 25, and the upper fin 49 from the base plate 21, the lower fin 25, and the upper fin 49. Take away and cool them.
Thus, the lower fins 25 and the upper fins 49 are attached to the lower surface 23 and the upper surface 31 of the base plate 21, respectively, and the heat radiation area is increased, so that the heat exchange efficiency can be improved and effective cooling is performed. be able to.
In order to increase the heat dissipation effect, for example, silver powder may be sprayed on at least one of the surfaces of the base plate 21, the lower fins 25, and the upper fins 49 to increase the heat dissipation area.

At this time, since the merge portion 41 is formed in the sealed fluid passage 37 as in the first embodiment, the air flow 45 is disturbed in this portion, in other words, a turbulent flow. Thereby, as demonstrated in 1st embodiment, the efficiency of heat exchange can be improved and effective cooling can be performed.
Moreover, since the confluence | merging part 41 is provided in multiple, for example, three places along the air flow direction L, the efficiency of the whole heat exchange can be improved and effective cooling can be performed.

  Since the interval between the junctions 41 a and 41 b located before and after the switch module 19 is set to be smaller than the interval between the junctions 41 b and 41 c located at a position away from the switch module 19, The heat exchange efficiency in the base plate 21 and the lower fin 25 having a relatively high temperature can be improved, and effective cooling can be performed.

In addition, since the merging portion 41 is provided so as to be inclined with respect to the air flow direction 45 so that the switch module 19 side is located on the downstream side, the vicinity of the switch module 19 is the same as described in the first embodiment. Thus, the heat exchange efficiency in the base plate 21 and the lower fin 25 having a relatively high temperature can be improved, and effective cooling can be performed.
In the present embodiment, the merge portion 41 is formed in the lower fin 25, but the merge portion may be formed in the upper fin 49 or both.

In the present embodiment, the merging portion 41 may be formed so as to be substantially orthogonal to the air flow direction L as shown in FIG.
Further, as shown in FIG. 8, when the switch module 19 is at a substantially central position in the width direction, the joining portion 41 is located at the most downstream side toward the downstream side in the air flow direction L. You may form so that a chevron may be formed.
Furthermore, you may make it provide the junction part 41 in a part of width direction, without providing in full width.

  Since the tip of the lower fin 25 is curved so that the height along the air flow direction L is minimized immediately before the switch module 19, the sealed fluid passage 37 is located near the switch module 19. The cross-sectional area gradually decreases until reaching the minimum, near the switch module 19, and then gradually increases. Thus, since the cross-sectional area of the sealed fluid passage 37 is reduced in the vicinity of the switch module 19, the flow velocity of the air flow 45 is increased in the vicinity of the switch module 19. When the flow velocity of the air flow 45 is increased, the amount of air contacting the base plate 21 and the lower fin 25 per unit time can be increased. When the amount of air that contacts per unit time increases, the amount of heat exchange between the base plate 21 and the lower fin 25 and the air increases, so that the base plate 21 and the lower fin 25 that have a relatively high temperature in the vicinity of the switch module 19. The heat exchange efficiency can be improved and effective cooling can be performed.

Of the amount of heat generated by the switch module 19, the amount of heat transferred to the air inside the cover 33 is absorbed by the portion located inside the cover 33 of the radiating fin 43 and the inner surface of the cover 33. Heat is radiated to the outside air from a portion located outside of 33 and the outer surface of cover 33. Thereby, the internal air of the cover 33 is cooled.
Thus, since the heat radiation fin 43 can increase the heat radiation area to the outside of the heat in the space in the cover 33, the inverter device 1 can be effectively cooled.

  The present invention is not limited to the embodiments described above, and various modifications may be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Inverter apparatus 15 Electronic component 17 Board | substrate 19 Switch module 21 Base plate 23 Lower surface 25 Lower fin 27 Radiation fin part 29 Fan 31 Upper surface 33 Cover 35 Fin cover 37 Sealing fluid channel | path 41,41a, 41b, 41c Merging part 43 Radiation fin 49 Upper side Fin 51 Fluid passage

Claims (8)

A board with a plurality of electronic components incorporated therein;
A base plate installed adjacent to a heat generating component having a large heat generation amount in the electronic component;
A heat dissipating fin portion having a plurality of first fins provided so as to be substantially parallel to one surface opposite to the substrate of the base plate portion, and forming a plurality of fluid passages;
An inverter device provided to face one end of the fluid passage and supply a fluid in a fluid flow direction along the fluid passage;
The radiating fin portion includes a plurality of merging portions that merge a plurality of the fluid passages in a direction intersecting the fluid flow direction in the fluid flow direction, and a distance between the merging portions is in the vicinity of the heat generating component. An inverter device characterized in that it is smaller than other portions.   2. The merging portion positioned at least in the vicinity of the heat generating component is provided so as to be inclined with respect to the fluid flow direction so that the heat generating component side is positioned on the downstream side. Inverter device.   3. The inverter device according to claim 1, further comprising a fin cover that covers a free end side of the plurality of first fins, wherein the fluid passage is a sealed fluid passage with a sealed periphery.   The inverter device according to claim 3, wherein a cross-sectional area of the sealed fluid passage is reduced in the vicinity of the heat generating component.   5. The inverter device according to claim 1, wherein the heat dissipating fin portion includes a plurality of second fins that dissipate heat on the other surface of the base plate portion on the substrate side.   The inverter device according to any one of claims 1 to 5, wherein the heat generating component is attached so as to be fitted into the base plate portion.   5. The cover according to claim 1, further comprising a cover that covers the other surface of the base plate portion including the substrate in which the electronic component is incorporated. Inverter device. The inverter device according to claim 7, wherein the cover includes a plurality of third fins attached so as to penetrate in the thickness direction.

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