WO2013039026A1

WO2013039026A1 - Work machine

Info

Publication number: WO2013039026A1
Application number: PCT/JP2012/073017
Authority: WO
Inventors: 和也横山; 晃伸中條
Original assignee: 住友重機械工業株式会社
Priority date: 2011-09-15
Filing date: 2012-09-10
Publication date: 2013-03-21
Also published as: JP6281840B2; JPWO2013039026A1

Abstract

Flow paths for a cooling medium are formed in a cooling plate. A power module is attached to the cooling plate and is thermally bonded to the cooling plate. The flow paths include: a first straight flow path that causes the cooling medium to flow in a first direction; a second straight flow path arranged to the side of the first straight flow path, and which causes the cooling medium to flow in a second direction opposite to the first direction; and a curved flow path connected to the first straight flow path and the second straight flow path, that changes the direction of progress for the cooling medium that has flowed along the first straight flow path, and causes same to flow along the second straight flow path. The area of the region where the second straight flow path and the power module overlap is larger than the area of the region where the first straight flow path and the power module overlap. A power conversion device including the cooling plate and the power module is mounted in a work machine.

Description

Work machine

The present invention relates to a work machine equipped with a power conversion device having a cooling function.

In recent years, hybrid work machines equipped with an engine and electric motor have been developed. In a hybrid work machine, an inverter (power converter) that converts DC power into AC power is used to drive a synchronous motor such as an internal magnet embedded (IPM) motor. In addition, a DC-DC converter is used to control charging / discharging of the battery. In order to cool a power converter such as an inverter or a DC-DC converter, a U-shaped curved cooling pipe is used.

JP 2010-187526 A JP 2010-11671 A

¡When the cooling pipe is bent, the internal flow is separated. When separation occurs in the flow, the cooling capacity of the portion decreases. For this reason, the cooling capacity varies depending on the location, and sufficient cooling capacity may not be obtained depending on the location. A partial decrease in cooling capacity causes a failure of a semiconductor element or the like used in the power conversion device. In particular, since the work machine may be used in a severe environment of high temperature, it is desirable to ensure a sufficient cooling capacity.

According to one aspect of the invention,
A cooling plate including a flow path for flowing a cooling medium;
A work machine equipped with a power converter having a power module attached to the cooling plate and thermally coupled to the cooling plate,
The flow path is disposed at a side of the first linear flow path for flowing the cooling medium in a first direction, and a second direction opposite to the first direction. The second straight flow path for flowing the cooling medium through the first straight flow path, the first straight flow path, and the second straight flow path are changed, and the traveling direction of the cooling medium flowing through the first straight flow path is changed. A curved flow path that flows into the second straight flow path,
A work machine is provided in which the area of the region where the second straight channel and the power module overlap is larger than the area of the region where the first straight channel and the power module overlap.

According to another aspect of the invention,
A cooling plate including a flow path for flowing a cooling medium;
A work machine equipped with a power converter having a power module attached to the cooling plate and thermally coupled to the cooling plate,
The flow path is disposed at a side of the first linear flow path for flowing the cooling medium in a first direction, and a second direction opposite to the first direction. The second straight flow path for flowing the cooling medium through the first straight flow path, the first straight flow path, and the second straight flow path are changed, and the traveling direction of the cooling medium flowing through the first straight flow path is changed. A curved flow path that flows into the second straight flow path,
With respect to the width direction of the first straight flow path, the power module passes through the center of curvature of the portion having the minimum curvature radius of the curved flow path and is based on a virtual straight line parallel to the first direction. A work machine is provided that is mounted at a position biased toward the second straight flow path.

¡Local temperature rise of the power module can be suppressed. Thereby, the reliability of a power converter device can be improved. As a result, the work machine can be continuously operated.

1A is a plan view of the power conversion apparatus according to the first embodiment, and FIGS. 1B and 1C are cross-sectional views taken along one-dot chain lines 1B-1B and 1C-1C in FIG. 1A, respectively. FIG. 2 is a diagram illustrating a simulation result of the temperature distribution of the cooling plate and the flow velocity in the flow path of the power conversion device according to the first embodiment. FIG. 3 is a diagram illustrating a simulation result of the temperature distribution of the cooling plate of the power converter according to the comparative example and the flow velocity in the flow path. 4A and 4B are cross-sectional views of the power converter according to the second embodiment. 5A is a plan view of the power conversion device according to the third embodiment, and FIG. 5B is a cross-sectional view taken along one-dot chain line 5B-5B in FIG. 5A. 6A and 6B are plan views of the power converter according to the fourth embodiment. FIG. 7 is a plan view of the power converter according to the fifth embodiment. 8A and 8B are cross-sectional views of a power conversion device according to the sixth embodiment and its modification, respectively. FIG. 9 is a plan view of the work machine according to the seventh embodiment. FIG. 10 is a side view of the work machine according to the seventh embodiment. FIG. 11 is a side view of the work machine according to the eighth embodiment.

[Example 1]
FIG. 1A is a plan view of the power conversion apparatus according to the first embodiment. The power module 50 is fixed to the surface of the cooling plate 20 and is thermally coupled to the cooling plate 20. The power module 50 is an electronic component such as an inverter circuit or a converter circuit, and includes a semiconductor element such as an insulated gate bipolar transistor (IGBT).

A cooling channel 21 is formed inside the cooling plate 20. The cooling flow path 21 includes a first straight flow path 21B connected to the cooling medium introduction pipe 23 and extending in a first direction (right direction in FIG. 1A). A second straight channel 21D is formed on the side of the first straight channel 21B (upward in FIG. 1A). The curved channel 21C continues from the downstream end of the first linear channel 21B to the upstream end of the second linear channel 21D. The cooling medium that has flowed through the first straight flow path 21B changes the traveling direction in the curved flow path 21C and flows into the second straight flow path 21D. A downstream end 21 E of the second straight channel 21 D is connected to the cooling medium discharge pipe 24.

The vicinity of the upstream end 21A of the first straight channel 21B is tapered so that the width increases toward the downstream. The width W of the first straight channel 21B other than the tapered portion is constant. The vicinity of the downstream end 21E of the second straight channel 21D is tapered so that the width increases toward the upstream. The width of the second straight channel 21D other than the tapered portion is equal to the width W of the first straight channel 21B. The width of the curved channel 21C is also equal to the width W of the first straight channel 21B.

The tapered portion functions as a runway until the turbulent flow becomes stable when the cross section of the flow path suddenly changes. The length of the runway is preferably about 10 times the equivalent pipe diameter. The equivalent pipe diameter De is
De = 4A / Wp
Is defined. Here, A is the cross-sectional area of the first straight channel 21B, and Wp is the wet edge length of the first straight channel 21B (the length of the wall surface in the channel cross section).

The area of the region A2 where the second straight channel 21D and the power module 50 overlap is larger than the area of the region A1 where the first straight channel 21B and the power module 50 overlap. The power module 50 is arranged so as to be biased toward the second straight flow path 21D with reference to an imaginary straight line passing through the center of curvature CC of the curved flow path 21C and parallel to the first direction. That is, the center line 50C of the power module 50 is shifted to the second straight flow path 21D side with respect to the virtual straight line IL passing through the center of curvature CC and parallel to the first direction. The entire area of the second straight channel 21D overlaps the power module 50 in the width direction. On the other hand, only a part of the first straight channel 21B overlaps the power module 50 in the width direction. More specifically, the path outside the first straight channel 21 B does not overlap the power module 50.

1B and 1C are cross-sectional views taken along one-dot chain lines 1B-1B and 1C-1C in FIG. 1A, respectively. The power module 50 includes a metal base plate 51 and a semiconductor element 52 attached thereon. The semiconductor element 52 is, for example, an IGBT or the like. The semiconductor element 52 is sealed with a resin 53. The power module 50 is fixed to the cooling plate 20 with the base plate 51 facing the cooling plate 20. Although FIG. 1B shows an example in which two semiconductor elements 52 are incorporated in one power module 50, three or more semiconductor elements may be incorporated. Six semiconductor elements are incorporated in the power module 50 that drives the three-phase AC motor.

A cooling channel 21 is formed inside the cooling plate 20. A first straight channel 21B and a second straight channel 21D appear in the cross section shown in FIG. 1B, and a curved channel 21C appears in the cross section shown in FIG. 1C. The cross section of the cooling flow path 21 has a flat shape with the smallest dimension in the thickness direction of the cooling plate 20. That is, the dimension H in the thickness direction of the cooling channel 21 is smaller than the dimension W in the width direction. The center line 50C of the power module 50 is shifted to the second straight flow path 21D side with respect to the curvature center CC.

A ridge-like convex portion 21F is formed on the upper surface of the cooling flow channel 21 (the surface closer to the surface to which the power module 50 is attached) along the flow direction of the cooling medium. By forming the convex portion 21F, the area of the region where the cooling medium and the cooling plate 20 are in contact with each other is increased. Thereby, the heat transfer efficiency from the cooling plate 20 to a cooling medium can be improved.

The cooling channel 21 can be formed by casting aluminum. When a flow path is formed by curving a straight pipe, the radius of curvature is limited by the diameter of the pipe. By applying casting to the formation of the flow path, the radius of curvature of the curved flow path 21C can be freely set.

FIG. 2 shows a simulation result of the temperature distribution of the cooling plate 20 of the power converter according to the first embodiment and the flow velocity in the cooling flow path 21. A region VL having a relatively low flow velocity, a region VM having a medium flow velocity, and a region VH having a high flow velocity are shown by changing the hatch interval. In addition, isotherms T1 to T10 are indicated by broken lines at a temperature interval of 2 ° C. The temperature of the isotherm T1 is the lowest and the temperature of the isotherm T10 is the highest.

It can be seen that the flow velocity of the path that flows into the curved flow path 21C from the inner path in the first linear flow path 21B and goes to the outer path in the second straight flow path 21D is relatively fast. In addition, the flow velocity of the path that leads from the outer path in the first straight flow path 21B to the outer path in the curved flow path 21C and the flow speed of the inner path in the second straight flow path 21D are relatively I understand that it is slow. In the region where the flow rate is low, the cooling capacity is relatively low, and in the region where the flow rate is high, the cooling capacity is relatively high.

FIG. 3 shows a simulation result of the temperature distribution of the cooling plate 20 of the power conversion device according to the comparative example and the flow velocity in the cooling flow path 21. The shape of the cooling channel 21 of the comparative example is the same as that of the first embodiment. In the comparative example, in the power module 50, the area of the region overlapping with the first straight flow path 21B is equal to the area of the region overlapping with the second straight flow path 21D. The center of curvature CC is located on the center line 50C of the power module 50. The power module 50 overlaps with the first straight flow path 21B in the entire width direction of the first straight flow path 21B.

The distribution of the flow velocity shows almost the same tendency as in the case of Example 1 shown in FIG. Isothermal lines T1 to T15 are indicated by broken lines at a temperature interval of 2 ° C. The temperature of the isotherm T1 is the lowest and the temperature of the isotherm T15 is the highest.

2 is compared with FIG. 3, it can be seen that the density of the isotherm of the power converter according to the comparative example is higher than the density of the isotherm of the power converter according to the first embodiment. That is, the variation in temperature is larger in the comparative example.

In particular, in the comparative example, it can be seen that the temperature of the region corresponding to the outer path in the first straight channel 21B is high. This is due to the low cooling capacity of this part due to the slow flow rate.

In Example 1, as shown in FIG. 2, the power module 50 is not disposed on the outer path in the first straight flow path 21B. For this reason, the remarkable raise of the temperature of the area | region corresponding to the path | route of the outer side in the 1st linear flow path 21B can be suppressed. Although the flow velocity of the inner path in the second straight channel 21D is also slow, this part is close to the first straight channel 21B. For this reason, a decrease in the cooling capacity due to the cooling medium flowing in the inner path in the second straight flow path 21D is compensated by the cooling medium flowing in the inner path in the first straight flow path 21B. On the other hand, in the comparative example shown in FIG. 3, there is no flow path further outside the outer path in the first straight flow path 21 B. . Thereby, it is considered that the temperature of the corresponding portion in the outer path in the first straight channel 21B is remarkably increased.

As described above, by adopting the configuration of the first embodiment, a local temperature increase of the power module 50 can be suppressed and the reliability can be improved.

In order to suppress a local temperature rise in the vicinity of the edge of the power module 50 that overlaps the first straight flow path 21B, from the edge of the power module 50 to the outer edge of the first straight flow path 21B. Is preferably ¼ or more of the width W of the first straight channel 21B. Moreover, you may make it the 1st linear flow path 21B and the power module 50 not overlap. In this case, the edge of the power module 50 is disposed between the first straight channel 21B and the second straight channel 21D.

Further, in the first embodiment, the cooling flow path 21 flat in the thickness direction is formed. For this reason, compared with the cooling structure formed by curving a substantially circular cooling pipe line in a U shape, the area where the power module 50 and the cooling channel 21 overlap can be widened. For example, in a plan view, 60% or more of the power module 50 can be configured to overlap the cooling channel 21. In the first embodiment, the area of the overlapping area is 60% or more of the area of the power module 50. On the other hand, when the flow path is produced by curving the cooling pipe, the radius of curvature is limited by the diameter of the pipe. For this reason, it is difficult to make the area of the power module 50 that overlaps the cooling pipeline 40% or more of the entire power module.

[Example 2]
4A and 4B are sectional views of the power converter according to the second embodiment. Hereinafter, differences from the power conversion apparatus according to the first embodiment illustrated in FIGS. 1A to 1C will be described, and description of the same configuration will be omitted. The top view of the power converter device by Example 2 is the same as the top view of Example 1 shown to FIG. 1A.

4A and 4B are cross-sectional views taken along one-dot chain lines 1B-1B and 1C-1C in FIG. 1A, respectively. In Example 2, the convex portion 21F illustrated in FIGS. 1B and 1C is not formed, and the bottom surface and the top surface of the cooling channel 21 are both flat. As in the first embodiment, the center line 50C of the power module 50 is shifted to the second straight flow path 21D side with respect to the curvature center CC.

Also in the second embodiment, the relative positional relationship between the cooling flow path 21 and the power module 50 in a plan view is the same as the relationship of the first embodiment. For this reason, like Example 1, the local temperature rise of the power module 50 can be suppressed and reliability can be improved.

[Example 3]
FIG. 5A is a plan view of the power conversion device according to the third embodiment. Hereinafter, differences from the power conversion apparatus according to the first embodiment illustrated in FIGS. 1A to 1C will be described, and description of the same configuration will be omitted.

In Example 3, the first linear flow channel 21B is separated into an inner flow channel 21Ba and an outer flow channel 21Bb arranged outside the first flow channel 21B in the width direction. The sum of the width W1 of the inner channel 21Ba and the width W2 of the outer channel 21Bb is the same as the width W of the second straight channel 21D.

Corresponding to the inner channel 21Ba and the outer channel 21Bb, the curved channel 21C is also separated into the inner channel 21Ca and the outer channel 21Cb. The widths of the inner channel 21Ca and the outer channel 21Cb are the same as the widths of the inner channel 21Ba and the outer channel 21Bb, respectively. The inner channel 21Ca and the outer channel 21Cb gradually approach toward the downstream and merge into one channel until reaching the upstream end of the second linear channel 21D.

The power module 50 overlaps the inner flow path 21Ba in the first straight flow path 21B, but does not overlap the outer flow path 21Bb. A portion corresponding to the inner path in the outer flow path 21Bb may overlap the power module 50. Also in this case, the portion corresponding to the outer path in the outer flow path 21Bb does not overlap the power module 50.

The power module 50 is fixed to the cooling plate 20 with screws 55. Some screws 55 are disposed between the inner flow path 21Ba and the outer flow path 21Bb.

FIG. 5B shows a cross-sectional view taken along one-dot chain line 5B-5B in FIG. 5A. In the cooling plate 20, the 1st linear flow path 21B and the 2nd linear flow path 21D are formed. The first straight channel 21B is separated into an inner channel 21Ba and an outer channel 21Bb. Some screws 55 are arranged between the inner flow path 21Ba and the outer flow path 21Bb. The screw 55 reaches a position deeper than the upper surface of the first straight channel 21B.

The upper surface of the cooling channel 21 may have a shape in which a convex portion 21F is formed as shown in FIGS. 1B and 1C, or may be flat as shown in FIGS. 4A and 4B.

Also in Example 3, the power module 50 overlaps only a part of the first linear flow path 21B, and the path outside the first linear flow path 21B does not overlap the power module 50. For this reason, like Example 1, the local temperature rise of the power module 50 can be suppressed and reliability can be improved.

In order to reduce the thermal resistance from the power module 50 to the cooling medium flowing through the cooling flow path 21, the cooling plate 20 interposed between the cooling flow path 21 and the power module 50 may be made as thin as possible. preferable. It is difficult to attach the screw 55 to the thinned portion. In the third embodiment, by separating the first linear flow path 21B into the inner flow path 21Ba and the outer flow path 21Bb, a thick portion for inserting the screw 55 can be secured.

The interval between the inner channel 21Ba and the outer channel 21Bb needs to be sufficient to insert and fix the screw 55. However, in order not to disturb the flow of the cooling medium, it is preferable to set the distance between the two to 100 mm or less. Similarly to the first embodiment, the distance from the edge of the power module 50 to the outer edge of the outer flow path 21Bb of the first linear flow path 21B is preferably set to 1/4 or more of the width W.

[Example 4]
FIG. 6A is a plan view of the power conversion device according to the fourth embodiment. Hereinafter, differences from the power conversion apparatus according to the first embodiment illustrated in FIGS. 1A to 1C will be described, and description of the same configuration will be omitted.

In Example 1, only one curved channel 21C is arranged, but in Example 4, a plurality of curved channels are arranged. That is, the cooling flow path 21 has a meandering shape in which straight flow paths and curved flow paths are alternately continued. In this case, the most upstream straight flow path 21B may be considered in association with the first straight flow path 21B of the first embodiment. The power module 50 overlaps only a part of the most upstream linear flow channel 21B in the width direction of the cooling flow channel 21, and the outer path in the most upstream linear flow channel 21B overlaps the power module 50. Absent. The entire area of the straight flow path other than the most upstream straight flow path overlaps the power module 50 in the width direction.

As with the first embodiment, the center line 50C of the power module 50 is downstream of the virtual straight line IL passing through the center of curvature CC of the central curved flow path 21C and parallel to the longitudinal direction of the straight flow path 21B. It is shifted to the side of the straight flow path on the side.

Also in Example 4, an outer path in the most upstream linear flow path 21 B exists outside the edge of the power module 50. For this reason, like Example 1, the local temperature rise of the power module 50 can be suppressed and reliability can be improved.

As shown in FIG. 6B, the edge of the power module 50 is between the most upstream linear flow path 21B and the adjacent straight flow path 21D (corresponding to the second straight flow path 21D of the first embodiment). The power module 50 may be attached to the cooling plate 20 so as to be disposed. In this case as well, as in the case of Example 4 in FIG. 6A, the power module 50 passes through the center of curvature CC of the central curved flow path 21C and is parallel to the virtual straight line IL parallel to the longitudinal direction of the straight flow path 21B. The center line 50C is shifted to the downstream straight channel side.

[Example 5]
In FIG. 7, the top view of the power converter device by Example 5 is shown. Hereinafter, differences from the power conversion apparatus according to the first embodiment illustrated in FIGS. 1A to 1C will be described, and description of the same configuration will be omitted.

Also in Example 5, the cooling channel 21 includes a first linear channel 21B, a curved channel 21C, and a second linear channel 21D. The first straight channel 21B allows the cooling medium to flow in a first direction (upward in FIG. 7). The second straight channel 21D is disposed on the side of the first straight channel 21B, and allows the cooling medium to flow in a direction opposite to the first direction (downward in FIG. 7). The curved channel 21C connects the downstream end of the first linear channel 21B to the upstream end of the second linear channel 21D. 21 C of curved flow paths are once curved in the direction away from 2nd linear flow path 21D as it leaves | separates from the downstream end of 1st linear flow path 21B, and are connected with 2nd linear flow path 21D after that.

With reference to the virtual straight line IL passing through the center of curvature CC of the curved channel 21C having the minimum radius of curvature and parallel to the first direction, the power module 50 is related to the width direction of the first linear channel 21B. It is attached at a position biased toward the second straight channel 21D. In the fifth embodiment, both the first straight flow path 21B and the second straight flow path 21D overlap the power module 50 in the entire area in the width direction.

The virtual straight line IL passing through the center of curvature CC of the curved flow path 21C and parallel to the longitudinal direction of the straight flow path 21B and the center line 50C of the power module 50 are shifted from each other, as in the first embodiment. Yes.

Since the curved flow path 21C is once curved outward, the flow velocity of the outer path in the first straight flow path 21B is not slow compared to the example shown in FIG. For this reason, the dispersion | variation in the in-plane distribution of the temperature of the power module 50 can be suppressed.

[Example 6]
FIG. 8A shows a cross-sectional view of the power converter according to the sixth embodiment. The cooling plate 20 and the power module 50 have the same configuration as the power conversion device according to any one of the first to fifth embodiments. A cooling channel 21 is formed in the cooling plate 20. A curved channel 21C appears in the cross section shown in FIG. A cooling medium discharge pipe 24 is connected to the cooling flow path 21. The cooling medium introduction pipe 23 (FIG. 1A) does not appear in the cross section of FIG.

The cooling plate 20 and the power module 50 are accommodated in the housing 60. The housing 60 includes a lower container 61 and an upper lid 62. The cooling plate 20 is fixed to the bottom surface of the lower container 61. The upper lid 62 closes the opening of the lower container 61. The cooling medium introduction pipe 23 and the cooling medium discharge pipe 24 pass through the side surface of the lower container 61 and are led out to the outside of the housing 60.

In addition, as shown in FIG. 8B, the cooling plate 20 and the lower container 61 may be integrally cast.

[Example 7]
FIG. 9 is a plan view of an excavator as an example of the work machine according to the seventh embodiment. An upper swing body 70 is attached to the lower traveling body 71 via a swing bearing 73. The upper swing body 70 includes an engine 74, a main pump 75, a swing electric motor 76, an oil tank 77, a cooling fan 78, a seat 79, a power storage module 80, a motor generator 83, a motor generator inverter 90,
A turning inverter 91 and a condenser converter 92 are mounted. The engine 74 generates power by burning fuel. The engine 74, the main pump 75, and the motor generator 83 transmit and receive torque to and from each other via the torque transmission mechanism 81. The main pump 75 supplies pressure oil to a hydraulic cylinder such as the boom 82.

The motor generator 83 is driven by the power of the engine 74 to generate power (power generation operation). The generated power is supplied to the power storage module 80, and the power storage module 80 is charged. In addition, the motor generator 83 is driven by the electric power from the power storage module 80 and generates power for assisting the engine 74 (assist operation). The oil tank 77 stores oil of the hydraulic circuit. The cooling fan 78 suppresses an increase in the oil temperature of the hydraulic circuit. The operator sits on the seat 79 and operates the hybrid excavator.

A power conversion device according to any one of the first to sixth embodiments is used for the motor generator inverter 90, the turning inverter 91, and the capacitor converter 92.

FIG. 10 shows a partially broken side view of the shovel according to the seventh embodiment. An upper swing body 70 is mounted on the lower traveling body 71 via a swing bearing 73. The upper swing body 70 includes a swing frame 70A, a cover 70B, and a cabin 70C. The swivel frame 70A functions as a support structure for the cabin 70C and various components. The cover 70B covers various components mounted on the turning frame 70A, for example, the power storage module 80, the condenser converter 92, and the like. A seat 79 (FIG. 9) is accommodated in the cabin 70C.

The turning electric motor 76 (FIG. 9) turns the turning frame 70A to be driven clockwise or counterclockwise with respect to the lower traveling body 71. A boom 82 is attached to the upper swing body 70. The boom 82 swings up and down with respect to the upper swing body 70 by a hydraulically driven boom cylinder 107. An arm 85 is attached to the tip of the boom 82. The arm 85 swings in the front-rear direction with respect to the boom 82 by an arm cylinder 108 that is hydraulically driven. A bucket 86 is attached to the tip of the arm 85. The bucket 86 swings in the vertical direction with respect to the arm 85 by a hydraulically driven bucket cylinder 109.

The power storage module 80 is mounted on the turning frame 70 A via a power storage module mount 95 and a damper (vibration isolation device) 96. The capacitor converter 92 is mounted on the turning frame 70 A via a converter mount 97 and a damper 98. Cover 70 B covers power storage module 80. The turning electric motor 76 (FIG. 9) is driven by the electric power supplied from the power storage module 80. In addition, the turning electric motor 76 generates regenerative electric power by converting kinetic energy into electric energy. The power storage module 80 is charged by the generated regenerative power.

Since the power conversion device according to any one of the first to sixth embodiments is used, a local temperature rise of the power modules in the motor generator inverter 90, the turning inverter 91, and the capacitor converter 92 is suppressed. , Can increase the reliability.

[Example 8]
FIG. 11 is a partially cutaway side view of a cargo handling work vehicle (forklift) as an example of the work machine according to the eighth embodiment. The cargo handling work vehicle according to the eighth embodiment includes a fork 111, wheels 112, an instrument panel 113, a handle 114, a lever 115, and a seat 116. A traveling motor inverter 120 and a condenser converter 121 are mounted on the chassis via a damper or the like. Any one of the power conversion devices of the first to sixth embodiments is used for the inverter 120 for the traveling motor and the converter 121 for the electric storage device. The travel motor inverter 120 supplies power to the travel motor. The capacitor converter 121 charges and discharges the capacitor.

The driver gets on the seat 116 and operates the handle 114, the plurality of levers 115, the accelerator pedal, the brake pedal, and other various switches. By these operations, operations such as raising and lowering the fork 111, advancing and retreating the cargo handling work vehicle, and turning right and left are performed. By combining these operations, it is possible to load and unload packages and carry them.

Since the power conversion device according to any one of the first to sixth embodiments is used, the local increase in the temperature of the power module in the inverter for driving motor 120 and the converter for capacitor 121 is suppressed, and the reliability is improved. Can do.

The power module 50 (for example, FIGS. 1A to 1C) included in the power converters according to the first to sixth embodiments described above has only one phase of the three-phase AC motor (one of the U phase, the V phase, and the W phase). When performing control, three power converters may be prepared corresponding to the U phase, the V phase, and the W phase. In this case, by arranging a plurality (for example, three) of power converters composed of the power module 50 and the cooling plate 20 shown in the first to sixth embodiments in the lateral direction (in-plane direction of the cooling plate 20). A three-phase power converter for a three-phase AC motor can be configured. Further, a configuration in which a plurality of (for example, three) power converters including the power module 50 and the cooling plate 20 shown in the first to sixth embodiments are stacked in the vertical direction (thickness direction of the cooling plate 20) may be employed. Good.

Although the present invention has been described with reference to the embodiments, the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications, improvements, combinations, and the like can be made.

Based on the above-mentioned Example 1 to Example 8, the invention described in the following supplementary notes is disclosed.

(Appendix 1)
A cooling plate including a flow path for flowing a cooling medium;
A power module attached to the cooling plate and thermally coupled to the cooling plate;
The flow path is disposed at a side of the first linear flow path for flowing the cooling medium in a first direction, and a second direction opposite to the first direction. The second straight flow path for flowing the cooling medium through the first straight flow path, the first straight flow path, and the second straight flow path are changed, and the traveling direction of the cooling medium flowing through the first straight flow path is changed. A curved flow path that flows into the second straight flow path,
The power conversion device, wherein an area of a region where the second straight channel and the power module overlap is larger than an area of a region where the first straight channel and the power module overlap.

(Appendix 2)
The width of the first straight flow path is equal to the width of the second straight flow path, and the second straight flow is related to the width direction of the first straight flow path and the second straight flow path. The power conversion device according to attachment 2, wherein an entire area of the road overlaps with the power module, but at least a part of the first straight flow path does not overlap with the power module in the width direction.

(Appendix 3)
The first straight channel is separated into an outer channel and an inner channel with respect to the width direction, and the outer channel and the inner channel are the second linear channel in the curved channel. 3. The power conversion device according to appendix 1 or 2, which joins one flow path before reaching.

(Appendix 4)
The power conversion device according to any one of appendices 1 to 3, wherein a ridge-like convex portion along a flow direction of the cooling medium is formed on an inner surface of the flow path on a side where the power module is attached. .

(Appendix 5)
The power conversion device according to any one of appendices 1 to 4, wherein a cross-sectional area of the first straight flow path and a cross-sectional area of the second straight flow path are the same.

(Appendix 6)
6. The power conversion device according to claim 1, wherein a region of the power module that overlaps the flow path is 60% or more of the entire area of the power module in plan view.

(Appendix 7)
A cooling plate including a flow path for flowing a cooling medium;
A power module attached to the cooling plate and thermally coupled to the cooling plate;
The flow path is disposed at a side of the first linear flow path for flowing the cooling medium in a first direction, and a second direction opposite to the first direction. The second straight flow path for flowing the cooling medium through the first straight flow path, the first straight flow path, and the second straight flow path are changed, and the traveling direction of the cooling medium flowing through the first straight flow path is changed. A curved flow path that flows into the second straight flow path,
With respect to the width direction of the first straight flow path, the power module passes through the center of curvature of the portion having the minimum curvature radius of the curved flow path and is based on a virtual straight line parallel to the first direction. The power converter attached to the position biased toward the second straight flow path.

(Appendix 8)
As the curved channel is separated from the downstream end of the first linear channel, the curved channel is once bent in a direction away from the second linear channel, and then connected to the second linear channel. The power converter described.

20 Cooling plate 21 Flow path 21A Upstream end 21B First straight flow path (most upstream straight flow path)
21Ba Inner channel 21Bb Outer channel 21C Curved channel 21D Second linear channel 21E Downstream end 21F Convex portion 21G Most downstream linear channel 23 Cooling medium introduction pipe 24 Cooling medium discharge pipe 50 Power module 51 Base plate 52 Semiconductor element 53 Sealing resin 55 Screw 60 Housing 61 Lower container 62 Upper lid 70 Upper turning body 70A Turning frame 70B Cover 70C Cabin 71 Lower traveling body 73 Turning bearing 74 Engine 75 Main pump 76 Turning electric motor 77 Oil tank 78 Cooling fan 79 Seat 80 Power storage module 81 Torque transmission mechanism 82 Boom 83 Motor generator 85 Arm 86 Bucket 90 Motor generator inverter 91 Turning inverter 92 Capacitor converter 95 Storage module mount 96 Damper (anti-vibration device)
97 Mount for converter 98 Damper 107 Boom cylinder 108 Arm cylinder 109 Bucket cylinder 111 Fork 112 Wheel 113 Instrument panel 114 Handle 115 Lever 116 Seat 120 Motor drive inverter 121 Battery converter

Claims

A cooling plate including a flow path for flowing a cooling medium;
A work machine equipped with a power converter having a power module attached to the cooling plate and thermally coupled to the cooling plate,
The flow path is disposed at a side of the first linear flow path for flowing the cooling medium in a first direction, and a second direction opposite to the first direction. The second straight flow path for flowing the cooling medium through the first straight flow path, the first straight flow path, and the second straight flow path are changed, and the traveling direction of the cooling medium flowing through the first straight flow path is changed. A curved flow path that flows into the second straight flow path,
A work machine in which an area of a region where the second straight channel and the power module overlap is larger than an area of a region where the first straight channel and the power module overlap.
The width of the first straight flow path is equal to the width of the second straight flow path, and the second straight flow is related to the width direction of the first straight flow path and the second straight flow path. 2. The work machine according to claim 1, wherein an entire area of the path overlaps with the power module, but at least a part of the first linear flow path does not overlap with the power module in the width direction.
The first straight channel is separated into an outer channel and an inner channel with respect to the width direction, and the outer channel and the inner channel are the second linear channel in the curved channel. The work machine according to claim 1 or 2, wherein the work machine merges into one flow path before reaching the position.
The work machine according to any one of claims 1 to 3, wherein a ridge-like convex portion along a flow direction of the cooling medium is formed on an inner surface of the flow path on a side where the power module is attached. .
The work machine according to any one of claims 1 to 4, wherein a cross-sectional area of the first straight channel and a cross-sectional area of the second straight channel are the same.
The work machine according to any one of claims 1 to 5, wherein a region of the power module that overlaps the flow path in a plan view is 60% or more of the entire area of the power module.
A cooling plate including a flow path for flowing a cooling medium;
A work machine equipped with a power converter having a power module attached to the cooling plate and thermally coupled to the cooling plate,
The flow path is disposed at a side of the first linear flow path for flowing the cooling medium in a first direction, and a second direction opposite to the first direction. The second straight flow path for flowing the cooling medium through the first straight flow path, the first straight flow path, and the second straight flow path are changed, and the traveling direction of the cooling medium flowing through the first straight flow path is changed. A curved flow path that flows into the second straight flow path,
With respect to the width direction of the first straight flow path, the power module passes through the center of curvature of the portion having the minimum curvature radius of the curved flow path and is based on a virtual straight line parallel to the first direction. A work machine attached to a position biased toward the second straight flow path.
8. The curved channel is once bent in a direction away from the second linear channel as it moves away from the downstream end of the first linear channel, and then connected to the second linear channel. The working machine described in.