JP6753686B2 - Power converters and railcars - Google Patents

Description

Embodiments of the present invention relate to power conversion devices and railway vehicles.

The railroad vehicle is equipped with a power conversion device that controls the drive of a traction motor or the like by converting the power supplied from the overhead wire into desired power. This type of power conversion device has a semiconductor element and a cooler for cooling the semiconductor element.
The above-mentioned coolers are roughly classified into a forced circulating liquid cooling system using a pump or the like, a forced air cooling system using a fan or the like, and a traveling wind natural air cooling system using a traveling wind. Recently, the natural air-cooled running style has become the mainstream from the viewpoint of noise reduction, energy saving, and maintenance-free operation.

The running wind natural air-cooled cooler is provided with a heat receiving block and a plurality of fins (air receiving portions). A semiconductor element is mounted on the heat receiving block. Each fin is connected to a heat receiving block. The fins extend parallel to each other along the front-rear direction of the vehicle. Therefore, a flow passage through which the traveling wind flows is formed between the adjacent fins when the railway vehicle travels. The running wind exchanges heat with the fins as it passes through the flow path. As a result, the heat generated in the semiconductor element is dissipated through the fins.

By the way, in the above-mentioned conventional power conversion device, the pressure loss when the traveling wind passes through the flow passage is large. Therefore, the traveling wind flowing into the flow passage from the front side in the assumed traveling direction of the railroad vehicle may flow out from the flow passage without reaching the rear end portion in the assumed traveling direction in the flow passage.

Japanese Unexamined Patent Publication No. 2013-103506

An object to be solved by the present invention is to provide a power conversion device and a railroad vehicle capable of effectively supplying traveling wind to a wind receiving portion and ensuring desired cooling performance.

The power conversion device of the embodiment includes a semiconductor element, a wind receiving portion, a wind guiding guide, and a flange portion. The semiconductor element can output the electric power for driving the vehicle. The wind receiving portion is connected to the semiconductor element. When the assumed direction of travel of the vehicle is the first direction and the direction orthogonal to the first direction is the second direction, the wind guide is arranged to face the wind receiving portion in the second direction and is in the first direction. Of both ends, the end closer to the center of the wind receiving portion is the first end, and the end opposite to the first end is the second end. The flange portion extends from the second end portion of the wind guide guide toward the side opposite to the wind receiving portion side. The distance between the second end of the wind guide and the wind receiving portion in the second direction is greater than or equal to the distance between the first end of the wind guiding guide and the wind receiving portion in the second direction.

The schematic side view of the railroad vehicle in 1st Embodiment. An exploded perspective view of the power conversion device according to the first embodiment. FIG. 2 is a schematic cross-sectional view corresponding to lines III-III of FIG. The graph which shows the relationship between the cooler entry speed (m / s) of a running wind, and the exhaust rate (%) with respect to a cooler entry speed. The graph which shows the relationship between the wind guide dimension (mm) and the thermal resistance ratio. A graph showing the relationship between the collar size (mm) and the thermal resistance ratio. The schematic perspective view of the power conversion apparatus in 2nd Embodiment. The schematic perspective view of the power conversion apparatus in 3rd Embodiment. FIG. 8 is a schematic cross-sectional view corresponding to the IX-IX line of FIG. The schematic perspective view of the power conversion apparatus in 4th Embodiment. An exploded perspective view of the power conversion device according to the fifth embodiment. An exploded perspective view of the power conversion device according to the sixth embodiment. The perspective view of the power conversion apparatus in 7th Embodiment.

Hereinafter, the power conversion device and the railroad vehicle of the embodiment will be described with reference to the drawings. In each of the figures shown below, the scale of each member is appropriately changed in order to make each member recognizable.
(First Embodiment)
FIG. 1 is a schematic side view of the railway vehicle 1.
As shown in FIG. 1, the railway vehicle 1 of the present embodiment includes a vehicle body 2, a bogie 3, and a power conversion device 4 for converting electric power supplied from the outside. In the following description, an orthogonal coordinate system of X, Y, and Z will be used as necessary. In the present embodiment, the X direction coincides with the vehicle front-rear direction (traveling assumed direction) of the railroad vehicle 1, the Y direction coincides with the vehicle width direction of the railroad vehicle 1, and the Z direction coincides with the vertical direction.

The vehicle body 2 is formed in a rectangular parallelepiped shape long in the X direction. A space that can accommodate passengers is formed inside the vehicle body 2. A pantograph 6 is projected from the ceiling of the vehicle body 2 in the + Z direction (upward). The pantograph 6 is configured to be in contact with the overhead wire 5.
The bogie 3 is attached under the floor of the vehicle body 2 via a bogie spring 7 such as an air spring. A pair of axles 11 extending in the Y direction are rotatably supported at both ends of the bogie 3 in the X direction. Wheels 12 are separately attached to both ends of these axles 11 in the Y direction. The bogie 3 is equipped with a traction motor 13 that rotates each axle 11. The bogie 3 is attached to both ends of each vehicle body 2 in the X direction.
The power conversion device 4 is mounted in a portion located between the pair of bogies 3 under the floor of the vehicle body 2.

FIG. 2 is an exploded perspective view of the power conversion device 4.
As shown in FIG. 2, the power conversion device 4 includes a semiconductor element 21 (see FIG. 3), a housing 22 that houses the semiconductor element 21, and a cooler 23 that cools the semiconductor element 21. .. In the following description, in the Y direction, the direction approaching the central portion of the railway vehicle 1 may be referred to as the inside in the Y direction, and the direction away from the central portion of the railway vehicle 1 may be referred to as the outside in the Y direction.

The housing 22 is formed in a rectangular parallelepiped shape that is long in the X direction. The housing 22 has a top wall portion 25 at a portion located in the + Z direction. The top wall portion 25 is provided with a mounting piece 26 that projects in the + Z direction. The mounting pieces 26 are provided at both ends of the top wall portion 25 in the Y direction. The power conversion device 4 is connected under the floor of the vehicle body 2 via each mounting piece 26.

The housing 22 has a side wall portion 27 at a portion located outside in the Y direction. The side wall portion 27 is located inside the vehicle body 2 in the Y direction with respect to the side surface located outside in the Y direction. Inspection doors 29 are provided at both ends of the side wall portion 27 in the X direction. The inspection door 29 opens and closes an inspection window (not shown) formed on the side wall portion 27.

FIG. 3 is a cross-sectional view corresponding to lines III-III of FIG.
As shown in FIG. 3, the semiconductor element 21 is configured to be capable of outputting electric power for driving the railway vehicle 1. Specifically, the semiconductor element 21 receives DC power via the overhead wire 5 and the pantograph 6, converts DC power into AC power, and supplies the DC power to the traction motor 13 and the like. The semiconductor element 21 constitutes a power conversion unit together with a control unit and the like (not shown). The power conversion units are collectively housed in the housing 22 described above. The control unit transmits and receives a switching signal to and from the semiconductor element 21.

As shown in FIG. 2, the cooler 23 includes a heat sink 31 that dissipates heat generated by the semiconductor element 21, a cover (support portion) 32 that covers the heat sink 31, and a diffuser 33.
The heat sink 31 is made of a material having high thermal conductivity such as aluminum. The heat sink 31 is provided so as to penetrate the side wall portion 27 in the Y direction in a state in which a part of the heat sink 31 projects outward from the side wall portion 27 of the housing 22 in the Y direction. As shown in FIG. 3, the heat sink 31 has a heat receiving block 41 and a wind receiving portion 42.

The heat receiving block 41 projects inward in the Y direction with respect to the side wall portion 27. That is, the heat receiving block 41 is located inside the housing 22. The above-mentioned semiconductor element 21 is mounted on the inner end surface of the heat receiving block 41 in the Y direction. In the present embodiment, four semiconductor elements 21 are mounted at intervals in the X direction on the inner end surface of the heat receiving block 41 in the Y direction.

As shown in FIG. 2, the wind receiving portion 42 projects outward in the Y direction with respect to the side wall portion 27. That is, the wind receiving portion 42 is located outside the housing 22. The wind receiving unit 42 receives the traveling wind mainly flowing in the X direction as the railway vehicle 1 travels. The wind receiving portion 42 includes a plurality of fins 43. The fin 43 is formed in a thin plate shape with the Z direction as the thickness direction. The fins 43 project from the outer end surface of the heat receiving block 41 in the Y direction toward the outside in the Y direction. The fins 43 are arranged side by side on the outer end surface of the heat receiving block 41 in the Y direction at intervals in the Z direction. Each fin 43 extends parallel to each other along the X direction. A flow passage R through which the traveling wind passes is formed between the fins 43 adjacent to each other in the Z direction. The flow passage R is open to both sides in the X direction and outward in the Y direction.

The cover 32 covers the wind receiving portion 42 from both sides in the X direction and the Z direction, and from the outside in the Y direction. Specifically, the cover 32 has a top wall portion 51, a pair of lateral side wall portions 52, and a pair of vertical side wall portions 53.

The top wall portion 51 is arranged outside the wind receiving portion 42 in the Y direction.
The lateral side wall portion 52 extends inward in the Y direction from portions located on both sides in the Z direction of the outer peripheral edge of the top wall portion 51.
The vertical side wall portion 53 extends inward in the Y direction from portions located on both sides in the X direction of the outer peripheral edge of the top wall portion 51. The inner end portions of the lateral side wall portion 52 and the vertical side wall portion 53 in the Y direction are connected to the side wall portion 27 of the housing 22.

A plurality of communication holes 54 that communicate with each other inside and outside the cover 32 are formed in the wall portions 51 to 53. The cover 32 has a function of protecting the heat sink 31 (air receiving portion 42) from foreign matter scattered during traveling and then circulating the traveling wind inside and outside the cover 32 through each communication hole 54. In the example of FIG. 2, in the cover 32, the communication hole 54 is not formed at least in the ridge line portion between the wall portions 51 to 53. If the strength of the wind receiving portion 42 is sufficiently secured, the cover 32 may not be provided.

As shown in FIG. 3, the diffuser 33 is arranged on both sides in the X direction (first direction) in the cover 32. Each diffuser 33 is arranged to face the wind receiving portion 42 on the outside in the Y direction (second direction). Each diffuser 33 and the cover 32 are connected to the vertical side wall portion 53, respectively. Each diffuser 33 is formed plane-symmetrically with respect to a plane of symmetry (not shown) extending in the YZ plane through the central portion of the wind receiving portion 42 in the X direction. Therefore, when it is not necessary to distinguish each diffuser 33, the same reference numerals are given and the description thereof will be omitted. Further, in the following description, in the X direction, the direction approaching the central portion of the wind receiving portion 42 may be referred to as the inside of the X direction, and the direction away from the central portion of the wind receiving portion 42 may be referred to as the outside of the X direction.

Each diffuser 33 has a wind guide 61 and a flange portion 62.
The wind guide 61 is formed in a plate shape extending along the X direction. Specifically, the wind guide 61 is inclined toward the outside in the Y direction from the inside to the outside in the X direction. That is, the distance of the wind guide 61 from the wind receiving portion 42 in the Y direction gradually increases from the inner end portion to the outer end portion in the X direction. The wind guide 61 may be formed so that the distance between the wind guide 61 and the wind receiving portion 42 in the Y direction is constant over the entire area in the X direction.

When viewed from the outside in the Y direction, the inner end of the wind guide 61 in the X direction overlaps the outer end in the X direction of the wind receiving portion 42. In the side view seen from the outside in the Y direction, the outer end portion in the X direction of the wind guide 61 projects outward in the X direction from the outer end surface in the X direction in the wind receiving portion 42. The wind guide 61 is provided in the cover 32 over the entire area in the Z direction.

The collar portion 62 is formed in a plate shape extending along the Y direction. The flange portion 62 projects from the outer end of the wind guide 61 in the X direction toward the outside in the Y direction. The collar portion 62 is connected to the outer end portion in the Y direction of the vertical side wall portion 53 described above.

Next, the operation of the railway vehicle 1 of the present embodiment will be described. In the following description, a case where the railway vehicle 1 travels in the + X direction will be described. Therefore, in the following description, the front side (+ X direction) in the assumed travel direction may be simply referred to as the front side, and the rear side (−X direction) in the assumed travel direction may be simply referred to as the rear side.
When the above-mentioned railway vehicle 1 is driven, first, AC power is supplied from each semiconductor element 21 to each traction motor 13, so that each traction motor 13 rotates. Then, the rotational force of the traction motor 13 is transmitted to the axle 11, so that the axle 11 and the wheels 12 rotate. As a result, the railroad vehicle 1 travels forward on a track (not shown). In the semiconductor element 21, heat is generated due to power loss during power conversion. The heat generated by the semiconductor element 21 is transferred to the fins 43 of the wind receiving portion 42 via the heat receiving block 41.

On the other hand, when the railway vehicle 1 travels, the traveling wind mainly flows in the −X direction around the railway vehicle 1. That is, the traveling wind flows from the front side (upstream side) to the rear side (downstream side) of the railway vehicle 1. As shown in FIG. 3, the traveling wind flows into the cover 32 through the communication hole 54 of the vertical side wall portion 53 located on the front side of the vertical side wall portion 53 of the cover 32 (see the arrow in FIG. 3). The traveling wind flowing into the cover 32 is guided by the wind guide 61 of the diffuser 33 located on the front side and circulates in the X direction. The traveling wind passes on the outer surface of the wind receiving portion 42 and in the flow passage R in the process of circulating in the cover 32 in the X direction. At this time, heat is exchanged between the wind receiving portion 42 (fins 43) and the traveling wind, so that the heat generated by the semiconductor element 21 is dissipated through the wind receiving portion 42. After that, the traveling wind is discharged to the outside of the cover 32 through the communication hole 54 of the cover 32.

Here, when the traveling wind circulating in the cover 32 is discharged from the cover 32 through the communication hole 54 of the vertical side wall portion 53 located on the rear side, for example, it flows through the diffuser 33 (mainly the collar portion 62) on the rear side. Is hindered. Therefore, a vortex is formed in the region behind the diffuser 33 on the rear side. As a result, a low-pressure region Q having a lower pressure than the region in front of the rear diffuser 33 is formed in the region behind the diffuser 33 on the rear side. Then, the traveling wind flowing through the cover 32 is drawn into the low pressure region Q, so that the flow rate of the traveling wind passing through the inside (inside in the Y direction) of the diffuser 33 on the rear side increases. As a result, the traveling wind that tries to escape from the inside of the ventilation passage R to the outside in the Y direction is pulled back into the ventilation passage R, and the flow rate of the traveling wind passing through the flow passage R increases.

As described above, in the present embodiment, the diffuser 33 is configured to include the wind guide 61 and the flange portion 62.
According to this configuration, the traveling wind flowing through the cover 32 is drawn toward the low pressure region Q formed behind the rear diffuser 33, so that the flow rate of the traveling wind passing through the rear diffuser 33 is reduced. Can be increased. As a result, the traveling wind trying to escape from the ventilation portion 42 (ventilation passage R) can be pulled back into the ventilation passage R, and in particular, the traveling wind passing through the rear side in the ventilation portion 42 (ventilation passage R). The flow rate can be increased. As a result, the traveling wind can be efficiently supplied to the flow passage R, and the traveling wind can be distributed over the entire flow passage R. Therefore, the cooling performance of the entire wind receiving portion 42 can be improved.

In particular, in the present embodiment, since the wind guide 61 is inclined toward the outside in the Y direction from the inside to the outside in the X direction, the low pressure region Q is also formed in the diffuser 33 on the rear side. Become. As a result, the flow rate of the traveling wind passing through the diffuser 33 on the rear side can be further increased.

In the present embodiment, since the diffusers 33 are arranged on both sides in the X direction with respect to the wind receiving portion 42, the diffusers 33 are arranged in both sides in the X direction as in the case of the railway vehicle 1 and are limited to the assumed traveling direction. However, the above-mentioned action and effect are successful.

Since the railway vehicle 1 of the present embodiment includes the power conversion device 4 having excellent cooling performance as described above, it is possible to provide the railway vehicle 1 having excellent reliability for a long period of time.

Here, a simulation result for verifying the effect of drawing in the running wind by the diffuser 33 will be described. In this simulation, in each of the power conversion device 4 having the diffuser 33 described above (hereinafter, simply referred to as an embodiment) and the power conversion device 4 without the diffuser 33 (hereinafter, simply referred to as a comparative example), The exhaust rate in the cooler 23 was measured. The exhaust air rate is the ratio of the flow rate of the running wind discharged from the rear side of the cooler 23 to the flow rate of the running wind flowing into the cooler 23 from the front side.

FIG. 4 is a graph showing the relationship between the cooler inlet speed (m / s), which is the flow velocity of the running wind when flowing into the cooler 23 from the front side, and the exhaust rate (%) with respect to the cooler inlet speed. Is.
As shown in FIG. 4, it can be seen that in the examples, the exhaust rate is higher at any flow velocity than in the comparative examples. This is because the traveling wind circulating in the cover 32 is drawn toward the low pressure region Q formed behind the diffuser 33 on the rear side as described above, so that the traveling wind flows from the inside of the ventilation path R to the outside in the Y direction. It is probable that this is because the running wind trying to escape was pulled back into the ventilation path R.

Next, a simulation result for verifying the relationship between the length in the X direction of the rear air guide 61 and the cooling performance will be described. The dimensions of the wind guide 61 other than the length in the X direction are as follows.
-Inclination angle of the wind guide 61 with respect to the X direction: 10 °
-Length of the collar 62 in the Y direction: 25 mm
-Length of the wind receiving portion 42 in the X direction: 700 mm
-Length of the wind receiving portion 42 in the Y direction: 135 mm
-Length of the cover 32 in the X direction: 715 mm
-Length of the cover 32 in the Y direction: 230 mm

FIG. 5 is a graph showing the relationship between the air guide dimension (length in the X direction (mm)) and the thermal resistance ratio. The thermal resistance ratio is the heat of the wind receiving portion 42 at each wind guiding guide dimension when the thermal resistance (k / W) of the wind receiving portion 42 is set to "1" when the air guiding guide dimension is 150 mm. The ratio of resistance.
As shown in FIG. 5, it can be seen that the thermal resistance ratio decreases as the air guide dimension becomes longer. It is considered that this is because the region of the fins 43 covered by the wind guide 61 is increased by lengthening the air guide dimension, and the running wind can be suppressed from escaping from the inside of the diffuser 33. In this way, as the area of the fins 43 covered by the air guide 61 increases, the pressure loss increases, and the flow rate of the traveling air flowing into the ventilation path R decreases, but the traveling wind flows to the rear of the ventilation path R. Due to the flowing effect, the thermal resistance ratio is reduced.

Next, a simulation result for verifying the relationship between the length of the rear flange portion 62 in the Y direction and the cooling performance will be described. In this simulation, the length of the wind guide 61 in the X direction was set to 360 mm. Other dimensions of the collar portion 62 other than the length in the Y direction are as described above.

FIG. 6 is a graph showing the relationship between the flange size (length in the Y direction (mm)) and the thermal resistance ratio. The thermal resistance ratio is the ratio of the thermal resistance at each flange dimension when the thermal resistance (k / W) of the wind receiving portion 42 is "1" when the flange dimension is 0 mm.
As shown in FIG. 6, it can be seen that in the range where the collar size is 10 mm or less, the thermal resistance ratio decreases as the collar size becomes longer. It is considered that this is because the low pressure region Q formed behind the flange portion 62 can be secured and the flow rate of the traveling wind flowing inside the diffuser 33 can be increased by increasing the collar portion dimension.

On the other hand, in the range where the collar size is larger than 10 mm, no significant change in the thermal resistivity was observed due to the change in the collar size. This is also considered to be due to the fact that there is a limit to the increase in the flow rate of the traveling wind flowing inside the diffuser 33 even if the collar dimension is enlarged toward the outside in the Y direction.

(Second Embodiment)
FIG. 7 is a schematic perspective view of the power conversion device 100 according to the second embodiment. The second embodiment is different from the first embodiment described above in that the ventilation hole 103 is formed in the flange portion 102. In the following description, the same reference numerals will be given to the same configurations as those in the above-described embodiment, and the description thereof will be omitted. Further, in FIG. 7, the cover 32 is shown by a chain line in order to make the structure inside the cover 32 easy to see.
In the power conversion device 100 shown in FIG. 7, the flange portion 102 of the diffuser 101 is formed with a ventilation hole 103 that penetrates the flange portion 102 in the X direction. A plurality of ventilation holes 103 are formed at intervals in the Y direction and the Z direction. The ventilation hole 103 is formed to have a smaller opening area than the communication hole 54 (see FIG. 2) of the cover 32.

According to the present embodiment, by forming the ventilation hole 103 in the flange portion 102, a part of the traveling wind is circulated through the ventilation hole 103, so that the drag force acting on the collar portion 102 can be suppressed. This makes it possible to improve the degree of freedom in designing the strength of the flange portion 102.

(Third Embodiment)
FIG. 8 is a schematic perspective view of the power conversion device 200 according to the third embodiment. The third embodiment is different from each of the above-described embodiments in that the collar portion 202 rotates with respect to the wind guide 61. In the following description, the same reference numerals will be given to the same configurations as those of the above-described embodiments, and the description thereof will be omitted. In FIG. 8, the cover 32 is shown by a chain line in order to make the structure inside the cover 32 easy to see.
In the power conversion device 200 shown in FIG. 8, the flange portion 202 of the diffuser 201 is rotatably connected to the wind guide 61 via the hinge portion 203. The hinge portion 203 rotates the collar portion 202 around a hinge axis (not shown) extending in the Z direction.

FIG. 9 is a schematic cross-sectional view corresponding to the IX-IX line of FIG.
The collar portion 202 rotates between the standing position and the tilted position. The collar portion 202 extends in the Y direction along the vertical side wall portion 53 of the cover 32 in the upright position. The flange portion 202 extends along the X direction at the tilted position and is superposed on the wind guide 61 in the Y direction. It is preferable that the collar portion 202 is rotated between the standing position and the tilted position by an actuator or the like (not shown).

In such a configuration, when the railway vehicle 1 is driven, the collar portion 202 located on the front side is rotated to the tilted position. On the other hand, the flange portion 202 located on the rear side is rotated to the upright position. As a result, the flow rate of the traveling wind passing through the inside of the diffuser 201 by the flange portion 202 located on the rear side is suppressed after suppressing the inflow of the traveling wind into the cover 32 by the flange portion 202 located on the front side. Can be increased. As a result, the flow rate of the running wind flowing in the X direction in the cover 32 can be increased, and the running wind can be more effectively supplied to the wind receiving portion 42.

(Fourth Embodiment)
FIG. 10 is a schematic perspective view of the power conversion device according to the fourth embodiment. The fourth embodiment is different from the above-described embodiment in that the diffuser 301 surrounds the wind receiving portion 42. In FIG. 10, the cover 310 is shown by a chain line in order to make it easier to see the structure inside the cover 310.
In the power conversion device 300 shown in FIG. 10, the air guide 302 of the diffuser 301 is formed in a semi-cylindrical shape. The wind guide 302 surrounds the wind receiving portion 42 when viewed from the front in the X direction. The flow path cross-sectional area of the wind guide 302 gradually increases toward the outside in the X direction. The wind guide 302 may have a square tubular shape or the like as long as it has a shape that surrounds the periphery of the wind receiving portion 42.

The flange portion 303 projects from the outer end portion of the wind guide 302 in the X direction toward the outer side in the radial direction. The cover 310 of the present embodiment covers each diffuser 301 from the outside in the Y direction and the outside in the X direction. The inside and outside of the cover 310 communicate with each other through a communication hole (not shown).

According to this configuration, when the railway vehicle 1 is traveling, the traveling wind flowing around the wind receiving portion 42 can be taken into the diffuser 301 on the rear side, so that the traveling wind can be more effectively traveled with respect to the wind receiving portion 42. Can supply wind.

(Fifth Embodiment)
FIG. 11 is an exploded perspective view of the power conversion device 500 according to the fifth embodiment. This embodiment differs from the above-described embodiment in that a heat pipe type heat sink 510 is used.
In the power conversion device 500 shown in FIG. 11, the wind receiving portion 511 of the heat sink 510 includes a heat pipe 512 and fins 513.

The heat pipe 512 is formed in the shape of a hollow rod extending along the Y direction. The inner end of the heat pipe 512 in the Y direction is embedded in the heat receiving block 41 (see FIG. 3). The outer end of the heat pipe 512 in the Y direction projects outward from the heat receiving block 41 in the Y direction. A refrigerant is sealed in the heat pipe 512. A plurality of heat pipes 512 are provided at intervals in the X direction and the Z direction. It is preferable that each heat pipe 512 is inclined in the + Z direction from the inside in the Y direction to the outside in the Y direction.

The fin 513 is formed in a thin plate shape with the Y direction as the thickness direction. A plurality of fins 513 are laminated on the outside of the heat receiving block 41 in the Y direction at intervals in the Y direction. The heat pipe 512 described above penetrates each fin 513 in the Y direction. A flow passage R through which running wind flows is formed between fins adjacent to each other in the Y direction.

According to this configuration, when the heat generated by the semiconductor element 21 is transferred to the heat receiving block 41, the heat heats the refrigerant in the heat pipe 512. Of the heated refrigerants, the gas-phase refrigerant flows to the outer end in the Y direction (the portion protruding from the heat receiving block 41) in the heat pipe 512. Then, the gas phase refrigerant is condensed by exchanging heat with the traveling wind at the outer end portion in the Y direction in the heat pipe 512 via the heat pipe 512 and the fin 513. As a result, the heat generated by the semiconductor element 21 can be dissipated through the refrigerant, the heat pipe 512, and the fins 513. The refrigerant condensed at the outer end in the Y direction in the heat pipe 512 becomes a liquid phase and returns to the inner end in the Y direction in the heat pipe 512 again.

According to the present embodiment, the heat pipe type heat sink 510 can also have the same effects as those of the above-described embodiments.

(Sixth Embodiment)
FIG. 12 is a perspective view of the power conversion device 600 according to the sixth embodiment. In the present embodiment, the configuration of the support portion 632 that supports the diffuser 33 is different from that of the above-described embodiment.
In the power conversion device 600 shown in FIG. 12, the support portion 632 is formed in a frame shape in a plan view seen from the outside in the Y direction. The support portion 632 surrounds the periphery of the wind receiving portion 42 (both sides in the X direction and both sides in the Z direction).

The support portion 632 has a pair of lateral side wall portions 652 and a pair of vertical side wall portions 653.
The lateral side wall portions 652 are provided on both sides in the Z direction with respect to the diffuser 33, respectively. The inner end of the lateral side wall portion 652 in the Y direction is connected to the side wall portion 27 of the housing 22.
The vertical side wall portion 653 is provided on the outer side in the X direction with respect to the diffuser 33, respectively. Each vertical side wall portion 653 connects one end portions and the other end portions in the X direction of each lateral side wall portion 652, respectively. The inner end of the vertical side wall portion 653 in the Y direction is connected to the side wall portion 27 of the housing 22. In addition, each side wall portion 652, 653 is formed with a communication hole 54 for communicating the inside and outside of the support portion 632.

In each of the diffusers 33 described above, at least one of the wind guide 61 and the flange portion 62 is connected to the support portion 632. In the present embodiment, both ends of the diffuser 33 (flange portion 62 and wind guide 61) in the Z direction are connected to the lateral side wall portion 652. Further, the outer end surface of the flange portion 62 in the X direction is connected to the vertical side wall portion 653. Therefore, in a plan view from the outside in the Y direction, the diffuser 33 closes a part of the outer opening in the Y direction in the support portion 632.

In the present embodiment, since the support portion 632 is opened toward the outside in the Y direction, the support portion is compared with the configuration in which the outside of the wind receiving portion 42 in the Y direction is covered with a cover (top wall portion 51 in FIG. 2). The cost of 632 can be reduced.
Further, it is possible to suppress an increase in pressure around the wind receiving portion 42 and effectively supply running wind to the heat receiving portion 42.

(7th Embodiment)
FIG. 13 is a perspective view of the power conversion device 700 according to the seventh embodiment. This embodiment differs from the above-described embodiment in that the diffuser 33 is supported by the support portions 732 at both ends in the Z direction.
In the power conversion device 700 shown in FIG. 13, the support portions 732 are arranged on both sides in the Z direction with respect to the wind receiving portion 42. Each support portion 732 extends outward from the side wall portion 27 of the housing 22 in the Y direction.

Both ends of the wind guide 61 in the Z direction are connected to the outer ends of each support portion 732 in the Y direction. That is, the diffuser 33 is bridged between the support portions 732 facing each other in the Z direction. Therefore, at least both sides in the X direction with respect to the wind receiving portion 42 are exposed to the outside. The support portion 732 may be connected to at least one of the wind guide 61 and the flange portion 62.

According to this configuration, at least both sides in the X direction with respect to the wind receiving portion 42 are exposed to the outside, so that the cost can be reduced as compared with the configuration in which the periphery of the wind receiving portion 42 is surrounded by a cover.
Further, it is possible to suppress an increase in pressure around the heat receiving portion 42 and effectively supply running wind to the wind receiving portion 42.

In the above-described embodiment, the configuration in which the support portion 732 separately supports one end portions and the other end portions in the Z direction of each diffuser 33 has been described, but the present invention is not limited to this. That is, the support portion 732 may be configured to collectively support one end portions and the other end portions in the Z direction of each diffuser 33. Further, the support portions may be arranged on both sides in the X direction with respect to the wind receiving portion 42 as long as the support portions support the diffuser 33.

In the first embodiment described above, the configuration in which the wind guide 61 is arranged outside the wind receiving portion 42 in the Y direction has been described, but the present invention is not limited to this, and the Z direction (Z direction with respect to the wind receiving portion 42 ( It may be arranged on both sides of the second direction).
In the above-described embodiment, the configuration in which the diffusers are arranged on both sides in the X direction with respect to the wind receiving portion 42 has been described, but the present invention is not limited to this, and the diffusers are arranged at least behind the wind receiving portion 42 in the assumed traveling direction. It doesn't matter if it is done.
In the above-described embodiment, the case where the power conversion device 4 of the present embodiment is mounted on the railway vehicle 1 has been described, but the present invention is not limited to this, and it can be mounted on various vehicles.

According to at least one embodiment described above, a wind guide that is arranged outside the wind receiving portion in the Y direction and extends in the X direction, and an outside end of the wind guide in the X direction in the Y direction. Since it is equipped with a collar that extends toward, the running wind is drawn toward the low pressure region formed behind the collar, and the flow of the running wind that passes through the inside of the wind guide is reduced. Can be increased. As a result, the traveling wind circulating in the cover can be pulled back into the ventilation passage to escape from the ventilation portion (ventilation passage), and particularly passes through the rear side in the ventilation portion (ventilation passage). The flow rate of the running wind can be increased. As a result, the running wind can be efficiently supplied to the flow passage, and the running wind can be distributed over the entire flow passage. Therefore, the cooling performance of the entire wind receiving portion can be improved.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, as well as in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... Railway vehicle, 4,100,200,300,500 ... Power converter, 21 ... Semiconductor element, 32 ... Cover (support part), 42,511 ... Wind receiving part, 61 ... Wind guide, 62,102, 202, 303 ... collar, 632, 732 ... support

Claims (7)

Semiconductor elements that can output electric power to drive vehicles,
The wind receiving part connected to the semiconductor element and
When the assumed traveling direction of the vehicle is the first direction and the direction orthogonal to the first direction is the second direction, the vehicle is arranged so as to face the wind receiving portion in the second direction and is in the first direction. Of both ends, a wind guide guide having the end near the center of the wind receiving portion as the first end and the end opposite to the first end as the second end.
A flange portion extending from the second end portion of the wind guide guide toward the side opposite to the wind receiving portion side is provided.
The distance in the second direction between the second end portion of the wind guide and the wind receiving portion is the second direction between the first end portion of the wind guiding guide and the wind receiving portion. Is more than the distance in
Power converter. The wind guide guide gradually increases as the distance from the wind receiving portion in the second direction increases from the first end side to the second end side.
The power conversion device according to claim 1. The wind guide and the collar are arranged on both sides of the wind receiver in the first direction, at positions where the first ends of the wind guide are separated from each other in the first direction.
The power conversion device according to claim 1 or 2. The collar portion is formed with a ventilation hole that penetrates the collar portion in the first direction.
The power conversion device according to any one of claims 1 to 3. The collar portion is rotatably connected to the second end portion of the wind guide.
The power conversion device according to any one of claims 1 to 4. A housing for accommodating the semiconductor element and supporting the wind receiving portion in a state of projecting outward in the second direction is provided.
The housing is provided with a support portion that supports at least one of the wind guide and the collar portion.
The power conversion device according to any one of claims 1 to 5. The power conversion device according to any one of claims 1 to 6 is provided.
Railroad vehicle.

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