WO2022107464A1 - ケース及び電気装置 - Google Patents

ケース及び電気装置 Download PDF

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Publication number
WO2022107464A1
WO2022107464A1 PCT/JP2021/036581 JP2021036581W WO2022107464A1 WO 2022107464 A1 WO2022107464 A1 WO 2022107464A1 JP 2021036581 W JP2021036581 W JP 2021036581W WO 2022107464 A1 WO2022107464 A1 WO 2022107464A1
Authority
WO
WIPO (PCT)
Prior art keywords
flow path
plate portion
bead
fin
floor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/036581
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
進一 三浦
海 森本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Original Assignee
Denso Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Denso Corp filed Critical Denso Corp
Priority to CN202180077120.XA priority Critical patent/CN116458272A/zh
Publication of WO2022107464A1 publication Critical patent/WO2022107464A1/ja
Priority to US18/193,146 priority patent/US12342513B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
    • H05K7/20927—Liquid coolant without phase change
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/327—Means for protecting converters other than automatic disconnection against abnormal temperatures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Definitions

  • the disclosure in this specification relates to cases and electrical appliances.
  • Patent Document 1 discloses a case having a flow path through which a refrigerant flows.
  • This case also serves as a cooler that houses a reactor and the like inside.
  • the case has a main body having an open upper surface among the side surfaces constituting the flow path, and a cover covering the opening of the flow path.
  • the cover is joined to the body by friction stir welding. This joint extends along the perimeter of the flow path.
  • the internal pressure which is the pressure applied to the case from the refrigerant
  • the internal pressure from the refrigerant increases, there is a concern that the stress due to this internal pressure will be concentrated on a part such as the inner peripheral end of the joint portion and plastic deformation of the cover will occur. If the cover is plastically deformed, the refrigerant will not flow properly in the flow path.
  • the main object of the present disclosure is to provide a case and an electric device capable of keeping the flow path through which the refrigerant flows in an appropriate state.
  • the flow path through which the fluid flows extends along its own internal space.
  • a case body having a main body surface provided with a recess forming a flow path and partitioning an internal space, and a case main body.
  • a plate-shaped flow path cover that is attached to the main body surface so as to cover the recess and forms a flow path together with the recess. Equipped with The flow path cover is A pair of joint plate portions that are joined to the main body surface by the joint portion and are arranged via the flow path in the width direction of the flow path.
  • a flow path plate portion provided between a pair of joint plate portions and facing a recess via a flow path in a state of extending in the width direction, and a flow path plate portion.
  • a connection portion provided between the joint plate portion and the flow path plate portion, connected to the flow path plate portion, and extended in a direction intersecting the flow path plate portion. Is a case.
  • connection portion connected to the flow path plate portion extends in a direction intersecting the flow path plate portion.
  • the connection part comes into contact with the inner surface of the recess and the connection part is elastically deformed, the stress generated by the internal pressure of the flow path or the linear expansion of the flow path cover is applied to the inner circumference of the joint part in the flow path cover. It is difficult to concentrate on a part such as the edge. Therefore, it is possible to prevent the flow path cover from being locally deformed and causing plastic deformation. By suppressing the plastic deformation of the flow path cover in this way, the flow path through which the refrigerant flows can be maintained in an appropriate state.
  • An electric device having an electric component and a case in which the electric component is housed in its own internal space, and formed so that a flow path through which a fluid flows extends along the electric component.
  • the case is A case body having a main body surface provided with a recess forming a flow path and partitioning an internal space, and a case main body.
  • a plate-shaped flow path cover that is attached to the main body surface so as to cover the recess and forms a flow path together with the recess.
  • Have and The flow path cover is A pair of joint plate portions that are joined to the main body surface by the joint portion and are arranged via the flow path in the width direction of the flow path.
  • a flow path plate portion provided between a pair of joint plate portions and facing a recess via a flow path in a state of extending in the width direction, and a flow path plate portion.
  • a connection portion provided between the joint plate portion and the flow path plate portion, connected to the flow path plate portion, and extended in a direction intersecting the flow path plate portion. It is an electric device that has.
  • FIG. 1 is a sectional view taken along line II-II of FIG. Bottom view of the power converter. The figure for demonstrating the joint part of the power conversion apparatus.
  • FIG. 2 is a sectional view taken along line VV of FIG.
  • FIG. 3 is a sectional view taken along line VI-VI of FIG. 3, which is a vertical sectional view of a floor flow path. An enlarged view of the area around the bead on the upstream wall side in FIG. The vertical sectional view of the floor flow path in the 2nd Embodiment. An enlarged view of the area around the bead on the upstream fin side in FIG. The vertical sectional view of the floor flow path in the 3rd Embodiment.
  • the vertical sectional view of the floor flow path in 4th Embodiment An enlarged view of the area around the bead on the upstream wall side in FIG. Enlarged view around the bead on the upstream wall side in the fifth embodiment.
  • the vertical sectional view of the floor flow path in the 6th Embodiment An enlarged view of the area around the bead on the upstream fin side in FIG. Enlarged view around the bead on the upstream fin side in the seventh embodiment.
  • the vertical sectional view of the floor flow path in 8th Embodiment The vertical sectional view of the floor flow path in the 9th Embodiment.
  • the power conversion device 10 shown in FIG. 1 is included in the drive system.
  • the drive system is installed in a vehicle such as an electric vehicle (EV), a hybrid vehicle (HV), or a fuel cell vehicle.
  • the drive system includes an inverter device, a battery, and a motor in addition to the power conversion device 10.
  • the drive system is a system that drives a motor to drive the drive wheels of a vehicle.
  • the battery is a DC voltage source composed of a rechargeable secondary battery.
  • the secondary battery is, for example, a lithium ion battery or a nickel hydrogen battery.
  • the drive system has a high voltage battery and a low voltage battery as the battery.
  • the voltage of the high voltage battery is, for example, 100V
  • the voltage of the low voltage battery is, for example, 12V.
  • the high voltage battery may be referred to as a first power supply unit
  • the low voltage battery may be referred to as a second power supply unit.
  • the motor is a three-phase AC rotary electric machine.
  • the motor has U phase, V phase, and W phase as three phases.
  • the motor functions as an electric motor that is a traveling drive source of the vehicle.
  • the motor functions as a generator during regeneration.
  • the inverter device performs power conversion between the high voltage battery and the motor.
  • the inverter device is capable of bidirectional power conversion.
  • the inverter device converts the DC power from the high voltage battery into AC power and supplies it to the motor. Further, the inverter device converts the AC power generated by the motor into DC power and supplies it to the high voltage battery.
  • the inverter device has an inverter circuit and a capacitor.
  • the inverter circuit is configured to include a plurality of semiconductor switches.
  • the capacitor is, for example, a smoothing capacitor, which smoothes the DC voltage supplied from the high voltage battery to the inverter circuit.
  • the power conversion device 10 is a converter device.
  • the power conversion device 10 and the converter unit 15 described later may be referred to as a DCDC converter.
  • the power conversion device 10 is capable of bidirectional power conversion.
  • the power conversion device 10 converts a DC voltage into a DC voltage of a different voltage.
  • the power conversion device 10 performs power conversion between a high voltage battery and a low voltage battery.
  • the power conversion device 10 steps down the DC voltage from the high-voltage battery and supplies it to the low-voltage battery.
  • the power conversion device 10 performs power conversion between the inverter device and the low voltage battery.
  • the power conversion device 10 steps down the DC voltage from the inverter device and supplies it to the low voltage battery.
  • the power conversion device 10 has a converter circuit, a capacitor, and a reactor.
  • the converter circuit is configured to include a plurality of semiconductor switches.
  • the capacitor is, for example, a filter capacitor, which removes power supply noise from a high voltage battery.
  • the reactor boosts the voltage from the high voltage battery, for example, with the switching operation of the semiconductor switch in the converter circuit.
  • the power conversion device 10 has a control device that controls the converter circuit.
  • the control device is composed of an ECU or the like. ECU is an abbreviation for Electronic Control Unit.
  • the control device may be included in the inverter device, and a control device common to the power conversion device 10 and the inverter device may be provided.
  • the power conversion device 10 has a converter unit 15, a capacitor unit 16, a reactor unit 17, and a case 20.
  • the converter unit 15, the capacitor unit 16, and the reactor unit 17 correspond to electric components, and the power conversion device 10 corresponds to an electric device.
  • the case 20 may be referred to as a converter case. Note that FIG. 2 shows the side surfaces of the converter unit 15 and the reactor unit 17 instead of the cross section.
  • the converter unit 15, the capacitor unit 16, and the reactor unit 17 are all rectangular parallelepiped as a whole, and are housed in the case 20.
  • the converter unit 15 has a switching element that constitutes a semiconductor switch of the converter circuit, and a switch case that protects the switching element.
  • the capacitor unit 16 has a capacitor element constituting a filter capacitor and a capacitor case for protecting the capacitor element.
  • the reactor unit 17 has a reactor element constituting the reactor and a reactor case for protecting the reactor element.
  • the case 20 is formed in a rectangular cylinder shape as a whole.
  • the case 20 has an internal space 21, a case opening 22, a case floor 23, and a case outer wall 24.
  • the case opening 22 is provided on the side opposite to the case floor 23 via the internal space 21.
  • the case outer wall 24 has a rectangular tubular shape and forms a case opening 22.
  • the directions orthogonal to each other are referred to as X direction, Y direction, and Z direction.
  • the case opening 22 and the case floor 23 are arranged in the Y direction.
  • the case floor portion 23 extends in the X direction and the Z direction orthogonal to the Y direction.
  • Both the case 20 and the case floor 23 are flattened so as to be thin in the Y direction, and the thickness direction of the case 20 and the case floor 23 is the Y direction.
  • the case floor 23 partitions the inside and outside of the case 20.
  • the floor upper surface 23a of the case floor portion 23 faces the case opening 22 via the internal space 21, and is a floor surface for the internal space 21.
  • the floor lower surface 23b of the case floor 23 faces the side opposite to the case opening 22, and is the lower surface of the case 20.
  • the floor upper surface 23a and the floor lower surface 23b extend in a direction orthogonal to the Y direction.
  • the case outer wall 24 extends in the Y direction and, like the case floor portion 23, partitions the inside and outside of the case 20.
  • the converter unit 15, the capacitor unit 16, and the reactor unit 17 are all housed in the internal space 21 of the case 20.
  • the converter unit 15, the capacitor unit 16, and the reactor unit 17 are provided side by side along the case floor portion 23.
  • the reactor unit 17 and the converter unit 15 are arranged in the X direction
  • the reactor unit 17 and the capacitor unit 16 are arranged in the Z direction.
  • the power conversion device 10 has a cooler 30.
  • the cooler 30 cools the internal space 21 of the case 20, the converter unit 15, the condenser unit 16, and the reactor unit 17 with the refrigerant.
  • the cooler 30 forms a refrigerant flow path 31 through which the refrigerant flows, and corresponds to a flow path forming portion.
  • the refrigerant is a fluid such as a liquid such as water or a gas such as air.
  • the refrigerant exerts a cooling effect by exchanging heat with the air in the internal space 21 and the converter unit 15, the condenser unit 16, and the reactor unit 17 via the cooler 30.
  • the cooler 30 is formed of a case 20 and members such as pipes attached to the case 20. That is, the cooler 30 includes the case 20.
  • a vehicle equipped with the power conversion device 10 is equipped with a cooling system including a cooler 30.
  • the refrigerant system has a circulation flow path in which the refrigerant circulates and a pump for circulating the refrigerant in the circulation flow path.
  • the circulation flow path includes the refrigerant flow path 31.
  • the refrigerant flows through the refrigerant flow path 31 by driving the pump.
  • the refrigerant flow path 31 has a floor flow path 32, an introduction path 33, and a discharge path 34.
  • the introduction path 33, the floor flow path 32, and the discharge path 34 are arranged in this order from the upstream to the downstream, and the arranged direction is referred to as an upstream / downstream direction.
  • the introduction path 33, the discharge path 34, and the floor flow path 32 may be directly connected or indirectly connected via a connection path or the like.
  • the floor flow path 32 is formed by the case floor portion 23.
  • the floor flow path 32 is provided inside the case floor portion 23, and extends along the floor lower surface 23b.
  • the upstream and downstream directions for the floor flow path 32 are orthogonal to the Y direction.
  • the width direction for the floor flow path 32 is a direction orthogonal to both the Y direction and the upstream / downstream direction.
  • the width direction of the upper flow path 32a and the width direction of the lower flow path 32b are both in the Z direction.
  • the floor flow path 32 corresponds to a “flow path through which a fluid flows”.
  • the floor flow path 32 is curved along the floor lower surface 23b.
  • the floor flow path 32 makes a U-turn so as to reciprocate along the floor lower surface 23b, and has a U-shape as a whole.
  • the floor flow path 32 has an upper flow path 32a, a lower flow path 32b, and a curved path 32c.
  • a curved path 32c is provided between the upper flow path 32a and the lower flow path 32b, and connects the upper flow path 32a and the lower flow path 32b.
  • the refrigerant flows from the upper flow path 32a through the curved path 32c into the lower flow path 32b.
  • the upper flow path 32a, the curved path 32c, and the lower flow path 32b are provided side by side along the floor lower surface 23b.
  • the upper flow path 32a and the lower flow path 32b are arranged in the Z direction.
  • the upper flow path 32a, the lower flow path 32b, and the curved path 32c are arranged in the X direction.
  • the curved path 32c is in a state of being passed over the upper flow path 32a and the lower flow path 32b in the Y direction.
  • the curved path 32c is curved so as to bulge toward the opposite side of the upper flow path 32a and the lower flow path 32b in the X direction, and has a curved shape as a whole.
  • the direction of the refrigerant flowing in the upper flow path 32a and the direction of the refrigerant flowing in the lower flow path 32b are opposite to each other.
  • the floor flow path 32 extends along the converter unit 15, the condenser unit 16, and the reactor unit 17.
  • the floor flow path 32 is provided at a position aligned with the converter unit 15 and the reactor unit 17 in the Y direction.
  • the reactor unit 17 is arranged at a position straddling the upper flow path 32a and the lower flow path 32b.
  • the converter unit 15 is arranged at a position straddling the upper flow path 32a, the lower flow path 32b, and the curved path 32c.
  • the case 20 has a case body 40 and a lower cover 50.
  • the case body 40 and the lower cover 50 are made of a metal material such as aluminum.
  • the case body 40 and the lower cover 50 are, for example, molded bodies made of die-cast aluminum.
  • the case body 40 and the lower cover 50 have thermal conductivity.
  • the case body 40 forms the main part of the case 20 and partitions the internal space 21.
  • the inner surface of the case body 40 is the inner surface of the case 20, forming the internal space 21.
  • the case main body 40 has a main body floor portion 41 and a main body outer wall 45.
  • the main body floor portion 41 is a portion included in the case floor portion 23 in the case main body 40.
  • the upper surface of the main body floor 41 is the floor upper surface 23a of the case 20.
  • the main body lower surface 41a is the floor lower surface 23b of the case 20.
  • the main body outer wall 45 is a portion of the case main body 40 included in the case outer wall 24.
  • the lower surface 41a of the main body corresponds to the surface of the main body.
  • the case floor portion 23 is formed by a main body floor portion 41 and a lower cover 50.
  • the lower cover 50 is included in the case floor portion 23 together with the main body floor portion 41.
  • the lower cover 50 has a plate shape as a whole and is attached to the floor portion 41 of the main body.
  • the lower cover 50 is overlapped with the lower surface 41a of the main body.
  • the lower cover 50 extends in a direction orthogonal to the Y direction.
  • the direction orthogonal to the Y direction is the direction in which the lower cover 50 extends.
  • the outer peripheral edge of the lower cover 50 is separated from the outer peripheral edge of the lower surface 41a of the main body toward the inner peripheral side. Therefore, both the main body floor portion 41 and the lower cover 50 form the floor lower surface 23b of the case 20.
  • the floor flow path 32 is provided between the main body floor portion 41 and the lower cover 50 in the case floor portion 23.
  • a recess 60 is provided on the lower surface 41a of the main body of the main body floor 41.
  • the floor flow path 32 is formed by covering the opening of the recess 60 with the lower cover 50.
  • the recess 60 forms the floor flow path 32, and extends in a groove shape in the upstream and downstream directions of the floor flow path 32.
  • the recess 60 is open toward the side opposite to the floor upper surface 23a.
  • the recess 60 is recessed from the lower surface 41a of the main body toward the upper surface 23a of the floor.
  • the depth direction and the height direction of the recess 60 and the floor flow path 32 are both in the Y direction.
  • the lower cover 50 covers the opening of the recess 60 from the side opposite to the floor upper surface 23a. In the direction in which the floor lower surface 23b extends, the lower cover 50 is in a state of protruding outward from the recess 60.
  • the lower cover 50 has a portion facing the recess 60 and a portion overlapped with the lower surface 41a of the main body. The portion of the lower cover 50 that is overlapped with the lower surface 41a of the main body is joined to the lower surface 41a of the main body.
  • the lower cover 50 corresponds to the flow path cover.
  • the thickness direction of the lower cover 50 is the Y direction.
  • fins 70 are provided in the floor flow path 32.
  • the fin 70 extends from the concave inner surface 61 of the recess 60 toward the lower cover 50.
  • the concave inner surface 61 is the inner surface of the concave portion 60.
  • the fins 70 extend in the upstream and downstream directions of the floor flow path 32.
  • the fin 70 is a part of the main body floor portion 41.
  • a plurality of fins 70 are arranged in the width direction of the floor flow path 32.
  • the plurality of fins 70 are provided in parallel with each other.
  • Each of the plurality of fins 70 extends continuously so as to straddle the upper flow path 32a and the lower flow path 32b via the curved path 32c.
  • the fin outer surface 71 which is the outer surface of the fin 70, includes the fin tip surface 72 and the fin side surfaces 73, 74.
  • the fin tip surface 72 faces the lower cover 50.
  • the fin side surfaces 73 and 74 are arranged in the width direction of the floor flow path 32 via the fin tip surface 72.
  • the fin side surfaces 73 and 74 extend in a direction intersecting the lower cover 50.
  • the fin side surfaces 73 and 74 extend from the concave bottom surface 62 toward the lower cover 50.
  • the fin side surfaces 73 and 74 are connected by the fin tip surface 72.
  • the height dimension of the fin 70 is the same as the depth dimension of the recess 60.
  • the fin tip surface 72 is arranged along the lower cover 50 on the lower surface 41a of the main body, and is at the same height as the lower surface 41a of the main body.
  • the concave inner surface 61 of the concave portion 60 includes a concave bottom surface 62 and concave wall surfaces 63, 64.
  • the concave bottom surface 62 and the concave wall surfaces 63 and 64 extend in the upstream and downstream directions of the floor flow path 32 and extend along the lower cover 50.
  • the concave bottom surface 62 faces the lower cover 50 via the floor flow path 32.
  • the concave wall surfaces 63 and 64 face each other via the concave bottom surface 62.
  • the concave wall surfaces 63 and 64 are arranged in the width direction of the floor flow path 32.
  • the concave wall surfaces 63 and 64 extend in a direction intersecting the lower cover 50.
  • the concave wall surfaces 63 and 64 extend in the depth direction of the concave portion 60.
  • the concave wall surfaces 63 and 64 extend from the concave bottom surface 62 toward the lower cover 50.
  • the concave wall surfaces 63 and 64 form the peripheral edge portion of the floor flow path 32.
  • the main body floor portion 41 has floor wall portions 42, 43.
  • the floor wall portions 42 and 43 are portions of the main body floor portion 41 forming the concave wall surfaces 63 and 64.
  • the floor wall portion 42 is a portion of the main body floor portion 41 located along the lower cover 50 and arranged in the recess 60. Of the floor wall portions 42 and 43, the floor wall portion 42 forms the concave wall surface 63, and the floor wall portion 43 forms the concave wall surface 64.
  • the floor wall portions 42 and 43 form the lower surface 41a of the main body.
  • the fin outer surface 71 is included in the concave inner surface 61 together with the concave bottom surface 62 and the concave wall surfaces 63 and 64.
  • the fin 70 extends from the concave bottom surface 62 toward the lower cover 50.
  • the fin tip surface 72 is located closer to the lower cover 50 than the concave bottom surface 62.
  • the fin 70 is in a state of partitioning the floor flow path 32 in the width direction.
  • the fin tip surface 72 is provided side by side on the lower surface 41a of the main body along the lower cover 50, and is at the same height as the lower surface 41a of the main body.
  • the lower cover 50 is overlapped on both the lower surface 41a of the main body and the tip surface 72 of the fins.
  • the case floor portion 23 has a joint portion 37.
  • the joint portion 37 is a portion where the main body floor portion 41 and the lower cover 50 are joined.
  • the lower cover 50 is fixed to the main body floor portion 41 by the joint portion 37.
  • the joint portion 37 extends along the peripheral edge portion of the floor flow path 32.
  • the joint portion 37 is shown by dot hatching. Further, in FIG. 4, the fin 70 is not shown.
  • the joint portion 37 includes the first joint portion 37a to the sixth joint portion 37f.
  • the first joint portion 37a is provided between the upper flow path 32a and the lower flow path 32b, and extends in the X direction along the inner peripheral edge of the peripheral edge portion of the floor flow path 32.
  • the second joint portion 37b to the sixth joint portion 37f extend along the outer peripheral edge of the peripheral edge portion of the floor flow path 32.
  • the second joint portion 37b extends in the Z direction along the upstream end portion of the upper flow path 32a.
  • the third joint portion 37c extends in the X direction along the upper flow path 32a.
  • the fourth joint portion 37d is curved so as to extend along the outer peripheral edge of the curved path 32c.
  • the fifth joint portion 37e extends in the X direction along the lower flow path 32b.
  • the sixth joint portion 37f extends in the Z direction along the downstream end portion of the lower flow path 32b.
  • the lower cover 50 has a joint plate portion 52, 53, a flow path plate portion 54, and a bead 55.
  • the joint plate portions 52, 53, the flow path plate portion 54, and the bead 55 are arranged along the main body floor portion 41.
  • the joint plate portions 52 and 53 are joined to the lower surface 41a of the main body by the joint portion 37.
  • the joint plate portions 52 and 53 are overlapped with the main body lower surface 41a and extend along the main body lower surface 41a.
  • the joint plate portions 52 and 53 extend along the peripheral edge portion of the floor flow path 32.
  • the inner peripheral ends of the joint plate portions 52 and 53 extend along the inner peripheral ends of the joint portion 37.
  • the joint plate portions 52 and 53 are located at positions separated from each other in the width direction of the floor flow path 32.
  • the joining plate portions 52, 53 are arranged via the floor flow path 32 in the width direction of the floor flow path 32, and are paired.
  • the joint plate portion 52 of the joint plate portions 52 and 53 is provided on the concave wall surface 63 side
  • the joint plate portion 53 is provided on the concave wall surface 64 side.
  • the bead 55 and the flow path plate portion 54 are provided between the pair of joint plate portions 52 and 53.
  • the bead 55 and the flow path plate portion 54 face the recess 60 via the floor flow path 32.
  • the flow path plate portion 54 extends in the width direction of the floor flow path 32 and faces the concave bottom surface 62 of the recess 60.
  • the flow path plate portion 54 is in a state of being spread over a plurality of fins 70 in the width direction of the floor flow path 32.
  • the flow path plate portion 54 is provided side by side on the joint plate portions 52 and 53 along the main body floor portion 41, and is located at the same height as the joint plate portions 52 and 53.
  • the flow path plate portion 54 is overlapped with the fin tip surface 72 and extends along the fin tip surface 72.
  • the bead 55 is provided between at least one of the joint plate portions 52 and 53 and the flow path plate portion 54.
  • the bead 55 is provided between the joint plate portion 52 and the flow path plate portion 54 of the joint plate portions 52 and 53, and connects the joint plate portion 52 and the flow path plate portion 54. is doing.
  • the bead 55 is not provided between the joint plate portion 53 and the flow path plate portion 54.
  • the bead 55 is connected to the flow path plate portion 54 and extends in a direction intersecting the flow path plate portion 54, and corresponds to the connection portion.
  • the bead 55 extends in the upstream / downstream direction along the peripheral edge of the floor flow path 32.
  • the bead 55 extends toward the recess 60 in the lower cover 50 and is in a state of entering the inside of the recess 60.
  • the bead 55 projects from the joint plate portions 52, 53 and the flow path plate portion 54 so as to bulge toward the inside of the recess 60.
  • the bead 55 has a curved vertical cross section.
  • the bead 55 has a bead outer surface 56 and a bead inner surface 57.
  • the bead outer surface 56 is the outer surface of the bead 55 and faces the recess 60 side.
  • the bead outer surface 56 is a curved surface curved so as to bulge toward the concave portion 60 side.
  • the bead outer surface 56 includes a bead tip surface 56a and bead side surfaces 56b and 56c.
  • the bead tip surface 56a faces the concave bottom surface 62 and extends along the concave bottom surface 62.
  • the bead side surfaces 56b and 56c extend in a direction intersecting the joint plate portions 52 and 53 and the flow path plate portion 54.
  • the bead side surface 56b extends from the joint plate portions 52 and 53 toward the concave bottom surface 62.
  • the bead side surface 56c extends from the flow path plate portion 54 toward the concave bottom surface 62.
  • the bead side surfaces 56b and 56c are connected by the bead tip surface 56a.
  • the bead 55 has a wide and flat shape as a whole so that the width dimension in the Z direction is larger than the height dimension in the Y direction.
  • the width dimension in the Z direction is larger than the protrusion dimension in the Y direction.
  • the separation distance between the bead side surfaces 56b and 56c in the Z direction is larger than the separation distance between the joint plate portions 52 and 53 and the flow path plate portion 54 and the bead tip surface 56a in the Y direction.
  • the bead inner surface 57 is the inner surface of the bead 55 and faces the side opposite to the recess 60.
  • the bead inner surface 57 is a curved surface curved so as to be recessed toward the recess 60 side.
  • the bead inner surface 57 is open toward the side opposite to the recess 60.
  • the bead inner surface 57 is in a state of being inserted into the recess 60.
  • the recessed dimension of the bead inner surface 57 is larger than the thickness dimension of the joint plate portions 52, 53 and the flow path plate portion 54.
  • the thickness dimension of the joint plate portion 52, 53 and the flow path plate portion 54 is the thickness dimension of the plate material forming the lower cover 50.
  • the width dimension of the bead 55 is larger than the height dimension of the bead 55.
  • the floor flow path 32 is bent so as to make a U-turn.
  • one end is the outer peripheral end and the other end is the inner peripheral end in the width direction.
  • the outer peripheral joint plate portion 52 of the joint plate portions 52 and 53 is arranged on the outer peripheral side of the flow path plate portion 54.
  • the inner peripheral joint plate portion 53 is arranged on the inner peripheral side of the flow path plate portion 54.
  • the bead 55 is provided between the flow path plate portion 54 and the outer peripheral joining plate portion 52, and connects the flow path plate portion 54 and the outer peripheral joining plate portion 52.
  • the bead 55 is not provided between the flow path plate portion 54 and the inner peripheral joint plate portion 53.
  • the flow path plate portion 54 and the inner peripheral joint plate portion 53 are directly connected to each other without a bead 55.
  • the outer peripheral bead side surface 56b of the bead side surfaces 56b and 56c is arranged on the outer peripheral side of the bead tip surface 56a.
  • the inner peripheral bead side surface 56c is arranged on the inner peripheral side of the bead tip surface 56a.
  • the outer peripheral concave wall surface 63 of the concave wall surfaces 63 and 64 is arranged on the outer peripheral side of the concave bottom surface 62.
  • the inner peripheral concave wall surface 64 is arranged on the inner peripheral side of the concave bottom surface 62.
  • the outer peripheral floor wall portion 42 of the floor wall portions 42 and 43 is arranged on the outer peripheral side of the floor flow path 32.
  • the inner peripheral floor wall portion 43 is arranged on the inner peripheral side of the floor flow path 32.
  • the outer peripheral fin side surface 73 of the fin side surfaces 73 and 74 is arranged on the outer peripheral side of the fin tip surface 72.
  • the inner peripheral fin side surface 74 is arranged on the inner peripheral side of the fin tip surface 72.
  • the outer peripheral concave wall surface 63 of the recess 60 and the outer peripheral bead side surface 56b of the bead 55 face each other. Further, the outer peripheral fin side surface 73 of the fin 70 and the inner peripheral bead side surface 56c of the bead 55 face each other.
  • the outer peripheral concave wall surface 63 extends toward the outer peripheral joining plate portion 52, and the inner peripheral concave wall surface 64 extends toward the inner peripheral joining plate portion 53.
  • the outer peripheral concave wall surface 63 and the inner peripheral concave wall surface 64 extend in a direction intersecting the flow path plate portion 54.
  • the outer peripheral concave wall surface 63 corresponds to the intersection surface and the peripheral wall surface.
  • the bead 55 is provided at a position in contact with the outer peripheral concave wall surface 63 of the recess 60 in the width direction of the floor flow path 32.
  • the bead 55 is provided between the fin 70 provided on the outermost peripheral side of the plurality of fins 70 and the outer peripheral floor wall portion 42.
  • the outer peripheral bead side surface 56b and the outer peripheral concave wall surface 63 of the bead 55 face each other and come into contact with each other.
  • the inner peripheral bead side surface 56c of the bead 55 and the outer peripheral fin side surface 73 of the fin 70 adjacent to the bead 55 face each other and are separated from each other in the width direction of the floor flow path 32.
  • the bead 55 is in contact with the outer peripheral concave wall surface 63. Even if the bead 55 is not in contact with the outer peripheral concave wall surface 63, the bead 55 is provided at a position close to the outer peripheral concave wall surface 63 so as to come into contact with the outer peripheral concave wall surface 63 as the refrigerant linearly expands. .. When heat is generated in an electric component such as the converter unit 15 or the reactor unit 17, the heat is applied to the refrigerant, which may cause linear expansion of the refrigerant.
  • the refrigerant linearly expands, the refrigerant pushes the bead 55 toward the outer peripheral concave wall surface 63, so that the lower cover 50 is elastically deformed and the bead 55 comes into contact with the outer peripheral concave wall surface 63.
  • the positions where the bead 55 contacts the outer peripheral concave wall surface 63 include a contact position where the bead 55 is in contact with the outer peripheral concave wall surface 63 and a contactable position where the bead 55 is separated within a range where the bead 55 can contact the outer peripheral concave wall surface 63.
  • be In the configuration in which the bead 55 is arranged at the contactable position, the separation distance between the bead 55 and the outer peripheral concave wall surface 63 is so small that the bead 55 comes into contact with the outer peripheral concave wall surface 63 due to the elastic deformation of the lower cover 50. .. In the present embodiment, the bead 55 is provided at one of the contact position and the contactable position.
  • the bead 55 has tip curved portions 58a and 58b and proximal end curved portions 58c and 58d.
  • the curved tip portions 58a and 58b are arranged in the width direction of the bead 55.
  • the tip curved portion 58a on the outer peripheral side connects the bead tip surface 56a and the outer peripheral bead side surface 56b.
  • the tip curved portion 58b on the inner peripheral side connects the bead tip surface 56a and the inner peripheral bead side surface 56c. Both the tip curved portions 58a and 58b are curved so as to bulge toward the concave bottom surface 62.
  • the base end curved portions 58c and 58d are arranged in the width direction of the bead 55.
  • the proximal end curved portion 58c on the outer peripheral side connects the outer peripheral bead side surface 56b and the outer peripheral joining plate portion 52.
  • the base end curved portion 58d on the inner peripheral side connects the inner peripheral bead side surface 56c and the flow path plate portion 54.
  • Both the base end curved portions 58c and 58d are curved so as to bulge toward the side opposite to the concave bottom surface 62.
  • the internal pressure applied to the recess 60 and the lower cover 50 from the refrigerant flowing through the floor flow path 32 may increase.
  • the internal pressure in the floor flow path 32 increases include a case where pulsation occurs in the flow of the refrigerant due to the driving of the pump for flowing the refrigerant.
  • the linear expansion of the refrigerant is caused by the heat generated in the converter unit 15 and the reactor unit 17.
  • the lower cover 50 is not provided with the bead 55 between the pair of joint plate portions 52 and 53.
  • the outer peripheral joint plate portion 52 and the flow path plate portion 54 are directly connected without the bead 55, and the stress due to the increase in the internal pressure of the floor flow path 32 is applied to the inner circumference of the joint portion 37 in the lower cover 50.
  • the stress due to the increase in the internal pressure of the floor flow path 32 is applied to the inner circumference of the joint portion 37 in the lower cover 50.
  • stress is concentrated on a part of the lower cover 50, it is considered that the lower cover 50 is locally deformed and plastic deformation occurs.
  • the boundary portion between the outer peripheral joint plate portion 52 and the flow path plate portion 54 is near the inner peripheral end of the joint portion 37. Therefore, in the lower cover 50, the plastic deformation that occurs around the inner peripheral end of the joint portion 37 causes the flow path plate portion 54 to move relatively toward the side opposite to the recess 60 with respect to the outer peripheral joint plate portion 52. It is considered that it is likely to occur depending on the aspect.
  • the bead 55 is provided at a position where it comes into contact with the outer peripheral concave wall surface 63.
  • the stress due to the increase in the internal pressure of the floor flow path 32 acts to press the bead 55 against the outer peripheral concave wall surface 63, and is applied to the outer peripheral concave wall surface 63 via the bead 55.
  • stress when stress is applied from the lower cover 50 to the outer peripheral concave wall surface 63, it is unlikely that the stress is concentrated on a part such as the inner peripheral end of the joint portion 37 in the lower cover 50. Therefore, it is suppressed that stress is concentrated on a part of the lower cover 50 and the lower cover 50 is locally deformed to cause plastic deformation.
  • the bead 55 is provided for each of the upper flow path 32a and the lower flow path 32b.
  • the bead 55 provided for the upper flow path 32a is also referred to as an upstream wall side bead 551, and the bead 55 provided for the lower flow path 32b is also referred to as a downstream wall side bead 552.
  • the portion provided for the upper flow path 32a is also referred to as an upstream joining plate portion 521
  • the portion provided for the lower flow path 32b is also referred to as a downstream joining plate portion 522.
  • the portion provided for the upper flow path 32a is also referred to as an upstream flow path plate portion 541
  • the portion provided for the lower flow path 32b is also referred to as a downstream flow path plate portion 542.
  • the portion forming the upper flow path 32a is also referred to as an upstream recess 601 and the portion forming the lower flow path 32b is also referred to as a downstream recess 602.
  • the portion forming the upper flow path 32a is also referred to as an upstream concave wall surface 631
  • the portion forming the lower flow path 32b is also referred to as a downstream concave wall surface 632.
  • the fin 70 the portion provided in the upper flow path 32a is also referred to as an upstream fin 701
  • the portion provided in the lower flow path 32b is also referred to as a downstream fin 702.
  • the portion forming the upper flow path 32a is also referred to as an upstream floor wall portion 421, and the portion forming the lower flow path 32b is also referred to as a downstream floor wall portion 422.
  • the inner peripheral floor wall portion 43 of the main body floor portion 41 is provided between the upstream recess 601 and the downstream recess 602.
  • the inner peripheral floor wall portion 43 partitions the upper flow path 32a and the lower flow path 32b, and corresponds to the partition portion.
  • the lower cover 50 is provided so as to straddle the inner peripheral floor wall portion 43 and span the upper flow path 32a and the lower flow path 32b. In other words, the lower cover 50 straddles the inner peripheral floor wall portion 43, the upstream recess 601 and the downstream recess 602, and extends over the upstream floor wall portion 421 and the downstream floor wall portion 422.
  • the inner peripheral joint plate portion 53 is provided between the upstream flow path plate portion 541 and the downstream flow path plate portion 542.
  • the inner peripheral joint plate portion 53 connects the upstream flow path plate portion 541 and the downstream flow path plate portion 542.
  • the upstream wall side bead 551 is provided at a position in contact with the outer peripheral concave wall surface 63 of the upstream recess 601.
  • the upstream wall side bead 551 is provided between the upstream joint plate portion 521 and the upstream flow path plate portion 541 in the width direction of the upper flow path 32a, and the upstream joint plate portion 521 and the upstream flow path plate portion 541 are provided. Is connected.
  • the downstream wall-side bead 552 is provided at a position in contact with the outer peripheral concave wall surface 63 of the downstream recess 602.
  • the downstream wall-side bead 552 is provided between the downstream joint plate portion 522 and the downstream flow path plate portion 542 in the width direction of the lower flow path 32b, and the downstream joint plate portion 522 and the downstream flow path plate portion 542. Is connected.
  • the upper flow path 32a corresponds to the first flow path
  • the lower flow path 32b corresponds to the second flow path.
  • the Z direction corresponds to the arrangement direction in which the first flow path and the second flow path are arranged side by side.
  • the upstream joint plate portion 521 corresponds to the joint plate portion and the first joint plate portion
  • the downstream joint plate portion 522 corresponds to the joint plate portion and the second joint plate portion.
  • the inner peripheral joint plate portion 53 corresponds to the joint plate portion and the partition joint plate portion.
  • the upstream flow path plate portion 541 corresponds to the flow path plate portion and the first flow path plate portion
  • the downstream flow path plate portion 542 corresponds to the flow path plate portion and the second flow path plate portion.
  • the upstream wall side bead 551 corresponds to the connection part, the contact connection part, the wall side connection part and the first connection part
  • the downstream wall side bead 552 corresponds to the connection part, the contact connection part, the wall side connection part and the second connection part. do.
  • the upstream concave wall surface 631 corresponds to the intersection surface and the first peripheral wall surface
  • the downstream concave wall surface 632 corresponds to the intersection surface and the second peripheral wall surface.
  • the step of manufacturing the power conversion device 10 includes a step of manufacturing the case 20 and a step of accommodating an electric component such as a converter unit 15 inside the case 20.
  • the operator performs a temporary attachment process of temporarily attaching the lower cover 50 to the case body 40 after manufacturing each of the case body 40 and the lower cover 50.
  • the lower cover 50 is used as a case so that the upstream wall-side bead 551 enters the inside of the upstream recess 601 and the downstream wall-side bead 552 enters the inside of the downstream recess 602.
  • the upstream wall side bead 551 and the downstream wall side bead 552 are in a state of being fitted between the upstream concave wall surface 631 and the downstream concave wall surface 632. Therefore, when the wall-side beads 551 and 552 come into contact with the outer peripheral concave wall surface 63, the displacement of the lower cover 50 with respect to the case body 40 in the Z direction is suppressed.
  • the case body 40 and the lower cover 50 are fixed by friction stir welding.
  • Friction stir welding is a method in which a tool rotating at high speed is pressed against the lower cover 50, and the lower cover 50 is joined to the main body floor portion 41 by the frictional heat between the tool and the lower cover 50.
  • the joint portion 37 is formed in the order of the first joint portion 37a to the sixth joint portion 37f by continuously performing friction stir welding along the peripheral edge portion of the recess 60. As shown by the two-dot chain line in FIG.
  • Friction stir welding is started from the start point 38A closest to the curved path 32c in the first joint portion 37a, and friction stir welding is started at the end point 38B closest to the upper flow path 32a in the sixth joint portion 37f.
  • the joint portion 37 is formed with a single stroke so that the joint is completed. Friction stir welding is sometimes referred to as FSW.
  • the main body floor 41 and lower cover 50 of the case main body 40 may undergo linear expansion due to the heat generated by friction stir welding.
  • the lower cover 50 is not provided with the bead 55
  • the stress due to this linear expansion is applied to the inside of the joint portion 37 in the lower cover 50.
  • it will be concentrated on some areas such as the peripheral edge. In this case, it is conceivable that stress is concentrated on a part of the lower cover 50 and the lower cover 50 is locally deformed to cause plastic deformation, as in the completed power conversion device 10.
  • the wall-side beads 551 and 552 are in contact with the outer peripheral concave wall surface 63. Therefore, the stress generated by the linear expansion of the lower cover 50 or the like is applied from the wall-side beads 551, 552 to the outer peripheral concave wall surface 63 as in the completed power conversion device 10, so that the lower cover 50 is plastically deformed. It is suppressed.
  • the method of joining the case body 40 and the lower cover 50 does not have to be friction stir welding.
  • the case body 40 and the lower cover 50 may be joined by welding or an adhesive.
  • the wall-side beads 551 and 552 extending in the direction intersecting the flow path plate portion 54 and the outer peripheral concave wall surface 63 extending in the direction intersecting the flow path plate portion 54 mutually. Contact. Therefore, even if stress is generated due to an increase in the internal pressure of the floor flow path 32 or linear expansion of the lower cover 50, this stress is applied to the outer peripheral concave wall surface 63 from the wall-side beads 551 and 552. Therefore, it is possible to suppress that stress is concentrated on a part of the lower cover 50 and the lower cover 50 is locally deformed to cause plastic deformation. As a result, the floor flow path 32 formed by the lower cover 50 can be kept in an appropriate state.
  • the wall-side beads 551 and 552 are in contact with the outer peripheral concave wall surface 63. Therefore, even if stress is generated due to an increase in the internal pressure of the floor flow path 32, stress is applied to the outer peripheral concave wall surface 63 from the wall-side beads 551 and 552 without waiting for elastic deformation of the lower cover 50 due to this stress. Therefore, stress can be more reliably applied from the lower cover 50 to the outer peripheral concave wall surface 63.
  • the outer peripheral concave wall surface 63 in contact with the wall-side beads 551 and 552 forms the peripheral edge portion of the floor flow path 32.
  • the stress applied to the outer peripheral concave wall surface 63 from the wall-side beads 551 and 552 is applied to the outer peripheral floor wall portion 42 forming the outer peripheral concave wall surface 63.
  • the outer peripheral floor wall portion 42 has a higher strength than the fin 70, for example, because it has a larger volume and forms a lower surface 41a of the main body. Therefore, even if stress is applied to the outer peripheral concave wall surface 63 from the wall-side beads 551 and 552, it is less likely that the outer peripheral floor wall portion 42 is deformed by this stress. Therefore, the floor flow path 32 formed by the outer peripheral floor wall portion 42 can be maintained in an appropriate state.
  • the entire wall-side beads 551 and 552 are easily elastically deformed. Therefore, when stress cannot be completely applied from the wall-side beads 551 and 552 to the outer peripheral concave wall surface 63, the entire wall-side beads 551 and 552 are elastically deformed, and the remaining stress is applied to the wall-side beads 551 and 551. It is possible to suppress the concentration on a part of 552.
  • the contact area between the wall-side bead 551, 552 and the outer peripheral concave wall surface 63 tends to be large. Therefore, it is unlikely that stress is concentrated on a part of the contact portion between the wall-side beads 551 and 552 and the outer peripheral concave wall surface 63. Therefore, it is possible to suppress that the portion of the wall-side beads 551 and 552 in contact with the outer peripheral concave wall surface 63 is locally deformed to cause plastic deformation of the wall-side beads 551 and 552.
  • the upstream wall side bead 551 contacts the upstream concave wall surface 631 in the upper flow path 32a
  • the downstream wall side bead 552 contacts the downstream concave wall surface 632 in the lower flow path 32b. Therefore, stress due to an increase in the internal pressure of the floor flow path 32 and linear expansion of the lower cover 50 is applied from the upstream wall side bead 551 to the upstream concave wall surface 631 and from the downstream wall side bead 552 to the downstream concave wall surface 632.
  • both the upper flow path 32a and the lower flow path 32b it is possible to suppress that stress is concentrated on a part of the lower cover 50 and the lower cover 50 is locally deformed to cause plastic deformation. As a result, both the upper flow path 32a and the lower flow path 32b formed by the lower cover 50 can be maintained in an appropriate state.
  • the lower cover 50 is passed over the upper flow path 32a and the lower flow path 32b via the inner peripheral floor wall portion 43.
  • the stress generated by the increase in the internal pressure of the floor flow path 32 and the linear expansion of the lower cover 50 is likely to be transmitted from the central side toward the outer peripheral edge. Therefore, in the lower cover 50, stress is more likely to be concentrated on a part of the inner peripheral end of the joint portion 37 and the like on the outer peripheral joint plate portion 52 than on the inner peripheral joint plate portion 53.
  • the wall-side beads 551 and 552 are connected to the outer peripheral joint plate portion 52. As described above, it is effective to suppress the plastic deformation of the lower cover 50 by the wall-side beads 551 and 552 for the outer peripheral joint plate portion 52 in which stress tends to concentrate on a part such as the inner peripheral end of the joint portion 37. ..
  • the bead 55 is provided at a position where the bead 55 comes into contact with the outer peripheral concave wall surface 63 of the concave portion 60.
  • the bead 55 is provided at a position where the bead 55 comes into contact with the inner peripheral fin side surface 74 of the fin 70.
  • the bead 55 is provided at a position separated from any of the concave wall surfaces 63 and 64 of the recess 60 in the width direction of the floor flow path 32.
  • the lower cover 50 has a plurality of flow path plate portions 54.
  • the flow path plate portion 54 is provided between the bead 55 and the outer peripheral joining plate portion 52, and is provided between the bead 55 and the inner peripheral joining plate portion 53.
  • the lower cover 50 is provided between the flow path plate portion 54 provided on the outer peripheral joining plate portion 52 side and the flow path plate portion 54 provided on the inner peripheral joining plate portion 53 side, and these flow path plates are provided.
  • the unit 54 is connected.
  • the flow path plate portion 54 provided on the outer peripheral joint plate portion 52 side connects the outer peripheral joint plate portion 52 and the bead 55.
  • the flow path plate portion 54 provided on the inner peripheral joint plate portion 53 side connects the inner peripheral joint plate portion 53 and the bead 55.
  • the bead 55 is provided between two flow path plate portions 54 adjacent to each other in the width direction of the floor flow path 32, and connects these flow path plate portions 54.
  • the bead 55 is connected to two flow path plate portions 54 and extends in a direction intersecting any of these flow path plate portions 54. In this embodiment, the bead 55 is not directly connected to any of the joint plate portions 52 and 53.
  • the bead 55 is provided at a position in contact with the inner peripheral fin side surface 74 of the fin 70 in the width direction of the floor flow path 32.
  • the bead 55 is provided between the fin 70 provided on the innermost peripheral side of the plurality of fins 70 and the inner peripheral floor wall portion 43.
  • the outer peripheral bead side surface 56b and the inner peripheral fin side surface 74 of the bead 55 are in contact with each other in a state of facing each other.
  • the inner peripheral bead side surface 56c of the bead 55 and the inner peripheral concave wall surface 64 are separated from each other in the width direction of the floor flow path 32 in a state of facing each other.
  • the inner peripheral fin side surface 74 corresponds to the intersection surface and the fin side surface.
  • the bead 55 is provided at a position where the bead 55 comes into contact with the inner peripheral fin side surface 74, the stress due to the increase in the internal pressure of the floor flow path 32 acts to be pressed against the inner peripheral fin side surface 74 via the bead 55. , Is applied to the inner peripheral fin side surface 74 via the bead 55.
  • stress is concentrated on a part such as the inner peripheral end of the joint portion 37 in the lower cover 50. Therefore, as in the first embodiment, stress is concentrated on a part of the lower cover 50, and the lower cover 50 is locally deformed to prevent plastic deformation.
  • the beads 55 are provided for each of the upper flow path 32a and the lower flow path 32b, as in the first embodiment.
  • the bead 55 provided for the upper flow path 32a is also referred to as an upstream fin side bead 553, and the bead 55 provided for the lower flow path 32b is also referred to as a downstream fin side bead 554.
  • the upstream fin side bead 553 is provided at a position in contact with the inner peripheral fin side surface 74 of the upstream fin 701.
  • the upstream fin side bead 553 is provided between two adjacent upstream flow path plate portions 541 in the width direction of the upper flow path 32a, and connects these upstream flow path plate portions 541.
  • the downstream fin side bead 554 is provided at a position in contact with the inner peripheral fin side surface 74 of the downstream fin 702.
  • the downstream fin side bead 554 is provided between two adjacent downstream flow path plate portions 542 in the width direction of the lower flow path 32b, and connects these downstream flow path plate portions 542.
  • the fin-side beads 535 and 554 correspond to the connection portion, the contact connection portion and the fin-side connection portion.
  • the manufacturing method of the case 20 will be described.
  • the upstream fin side bead 555 and the downstream fin side bead 554 are in a state of being fitted between the upstream fin 701 and the downstream fin 702. .
  • the fin-side beads 533 and 554 come into contact with the inner peripheral fin side surface 74, the misalignment of the lower cover 50 with respect to the case body 40 in the Z direction is suppressed.
  • the fin-side beads 535 and 554 are in contact with the inner peripheral fin side surface 74. Therefore, the stress generated by the linear expansion of the lower cover 50 or the like is applied from the fin side beads 533, 554 to the inner peripheral fin side surface 74 as in the completed power conversion device 10, so that the lower cover 50 is plastically deformed. Is suppressed.
  • the fin-side beads 535, 554 extending in the direction intersecting the flow path plate portion 54 and the inner peripheral fin side surface 74 extending in the direction intersecting the flow path plate portion 54 come into contact with each other. Therefore, even if stress is generated due to an increase in the internal pressure of the floor flow path 32 or linear expansion of the lower cover 50, this stress is applied to the inner peripheral fin side surface 74 from the fin side beads 533, 554. Therefore, plastic deformation of the lower cover 50 can be suppressed by the fin-side beads 535 and 554.
  • the fin-side beads 535 and 554 are in contact with the inner peripheral fin side surface 74. Therefore, even if stress is generated due to an increase in the internal pressure of the floor flow path 32, stress is applied to the inner peripheral fin side surface 74 from the fin side beads 533, 554 without waiting for elastic deformation of the lower cover 50 due to this stress. .. Therefore, stress can be more reliably applied from the lower cover 50 to the inner peripheral fin side surface 74.
  • the inner peripheral fin side surface 74 is included in the fin outer surface 71 of the fin 70.
  • the stress applied to the inner peripheral fin side surface 74 from the fin side beads 533, 554 is applied to the fin 70. Therefore, the fins 70 both expand the contact area between the concave inner surface 61 of the recess 60 and the refrigerant in the floor flow path 32 to enhance the cooling effect of the refrigerant and suppress the local deformation of the lower cover 50. Can be realized.
  • the entire fin-side bead 553 is easily elastically deformed. Therefore, when stress cannot be completely applied from the fin-side beads 535, 554 to the inner peripheral fin side surface 74, the entire fin-side beads 535, 554 are elastically deformed, and the remaining stress is applied to the fin-side bead 553. , It is possible to suppress the concentration on a part of 554.
  • the contact area between the fin side bead 535, 554 and the fin 70 tends to be large. .. Therefore, it is unlikely that stress is concentrated on a part of the contact portion between the fin side bead 535, 554 and the inner peripheral fin side surface 74. Therefore, it is possible to prevent the portion of the fin-side bead 535, 554 that is in contact with the fin 70 from being locally deformed to cause plastic deformation of the fin-side bead 535, 554.
  • the bead 55 is provided at a position where the bead 55 contacts the outer peripheral concave wall surface 63
  • the bead 55 is provided at a position where the bead 55 contacts the inner peripheral fin side surface 74.
  • the bead 55 is provided at a position in contact with the outer peripheral concave wall surface 63 and a position in contact with the inner peripheral fin side surface 74, respectively.
  • the configurations, actions, and effects not particularly described in the third embodiment are the same as those in the first and second embodiments. In the third embodiment, the points different from the first and second embodiments will be mainly described.
  • a plurality of beads 55 are provided for each of the upper flow path 32a and the lower flow path 32b.
  • a plurality of beads 55 are arranged in the width direction of the upper flow path 32a, and fins 70 are provided between two adjacent beads 55.
  • the lower flow path 32b a plurality of beads 55 are arranged in the width direction of the lower flow path 32b, and fins 70 are provided between two adjacent beads 55.
  • the plurality of beads 55 include the wall-side beads 551 and 552 of the first embodiment and the fin-side beads 533 and 554 of the second embodiment.
  • a plurality of upstream fin side beads 553 are provided in the upper flow path 32a.
  • the plurality of upstream fin-side beads 553 are arranged in the width direction of the upper flow path 32a, and are provided at positions where they come into contact with different upstream fins 701.
  • one of two adjacent upstream fin-side beads 553 is provided between the inner peripheral floor wall portion 43 and the upstream fin 701 adjacent to the inner peripheral floor wall portion 43, and the upstream fin 701 is provided. It contacts the inner peripheral fin side surface 74.
  • the other is provided between two adjacent upstream fins 701 and comes into contact with the inner peripheral fin side surface 74 of the upstream fin 701 on the opposite side of the inner peripheral floor wall portion 43.
  • a plurality of downstream fin side beads 554 are provided in the lower flow path 32b.
  • the plurality of downstream fin-side beads 554 are arranged in the width direction of the lower flow path 32b, and are provided at positions where they come into contact with different downstream fins 702.
  • one of the two adjacent downstream fin-side beads 554 is provided between the inner peripheral floor wall portion 43 and the downstream fin 702 adjacent to the inner peripheral floor wall portion 43, and the downstream fin 702. It contacts the inner peripheral fin side surface 74.
  • the other is provided between two adjacent downstream fins 702 and contacts the inner peripheral fin side surface 74 of the downstream fin 702 on the opposite side of the inner peripheral floor wall portion 43.
  • the outer peripheral concave wall surface 63 of the recess 60 has an inclined surface 68.
  • the configurations, actions, and effects not particularly described in the fourth embodiment are the same as those in the first to third embodiments.
  • the points different from the third embodiment will be mainly described.
  • the outer peripheral concave wall surface 63 of the recess 60 has an upright surface 67 and an inclined surface 68.
  • the upright surface 67 forms an end portion on the outer peripheral concave wall surface 63 on the concave bottom surface 62 side.
  • the upright surface 67 extends in the depth direction of the recess 60 in the direction intersecting the lower cover 50.
  • the inclined surface 68 is provided on the side opposite to the concave bottom surface 62 via the upright surface 67 in the depth direction of the recess 60, and forms an end surface on the outer peripheral concave wall surface 63 on the lower surface 41a side of the main body.
  • the inclined surface 68 extends in a direction in which it is inclined with respect to both the upright surface 67 and the lower surface 41a of the main body, and connects the upright surface 67 and the lower surface 41a of the main body.
  • the inclination of the inclined surface 68 with respect to the depth direction of the recess 60 is larger than the inclination of the upright surface 67 with respect to the depth direction of the recess 60.
  • the vertical cross section of the recess 60 has a shape such that the protruding corner portion of the outer peripheral concave wall surface 63 and the lower surface 41a of the main body is chamfered by the inclined surface 68.
  • the plurality of beads 55 include beads 55 provided at positions in contact with the inclined surface 68 of the outer peripheral concave wall surface 63.
  • each of the upstream wall side bead 551 and the downstream wall side bead 552 is provided at a position where it comes into contact with the inclined surface 68 of the outer peripheral concave wall surface 63.
  • the wall-side beads 551 and 552 are provided on the inclined surface 68 side of the upright surface 67 in the depth direction of the recess 60.
  • the wall-side beads 551 and 552 and the upright surface 67 are arranged in the depth direction of the recess 60.
  • the wall-side beads 551 and 552 are provided side by side on the inclined surface 68 in the width direction of the floor flow path 32.
  • the tip curved portion 58a on the outer peripheral side is located at the position closest to the inclined surface 68, and is most likely to come into contact with the inclined surface 68.
  • the inclined surface 68 is inclined so that the inclined surface 68 extends along the tip curved portion 58a on the outer peripheral side. Therefore, when the tip curved portion 58a on the outer peripheral side and the inclined surface 68 come into contact with each other, the contact area between the wall-side beads 551 and 552 and the outer peripheral concave wall surface 63 tends to increase. Therefore, the stress is concentrated on a part of the contact portion between the wall-side beads 551 and 552 and the outer peripheral concave wall surface 63, which is suppressed by the contact between the outer peripheral side tip curved portion 58a and the inclined surface 68.
  • the inclined surface 68 is inclined with respect to the outer peripheral bead side surface 56b and the inner peripheral bead side surface 56c of the wall side beads 551 and 552.
  • the inclined surface 68 with which the wall-side beads 551 and 552 come into contact is inclined with respect to the depth direction of the concave portion 60. Therefore, even if the relative positions of the wall-side beads 551 and 552 with respect to the outer peripheral concave wall surface 63 are slightly deviated in the width direction of the floor flow path 32 due to manufacturing errors or the like, the wall-side beads 551 and 552 are outer peripheral concave. It is easy to come into contact with the inclined surface 68 of the wall surface 63.
  • the contact area between the wall-side beads 551 and 552 and the outer peripheral concave wall surface 63 tends to increase regardless of which of the outer peripheral side tip curved portion 58a and the outer peripheral bead side surface 56b comes into contact with the inclined surface 68. Therefore, even if the lower cover 50 is deformed, the inclined surface 68 can suppress the stress from being concentrated on a part at the contact portion between the wall-side beads 551 and 552 and the outer peripheral concave wall surface 63.
  • the outer peripheral bead side surface 56b of the bead 55 is inclined with respect to the inclined surface 68 of the recess 60.
  • the outer peripheral bead side surface 56b extends along the inclined surface 68.
  • the wall-side beads 551 and 552 do not have a curved vertical cross section, but have a linear shape as a whole.
  • the wall-side beads 551 and 552 do not have curved portions 58a to 58d, unlike the fourth embodiment.
  • the bead tip surface 56a and the outer peripheral bead side surface 56b are directly connected to each other without the outer peripheral side tip curved portion 58a.
  • the outer peripheral bead side surface 56b and the outer peripheral joining plate portion 52 are directly connected to each other without passing through the proximal end curved portion 58c on the outer peripheral side.
  • the bead tip surface 56a and the inner peripheral bead side surface 56c are directly connected to each other without passing through the tip curved portion 58b on the inner peripheral side.
  • the inner peripheral bead side surface 56c and the flow path plate portion 54 are directly connected to each other without passing through the proximal end curved portion 58d on the inner peripheral side.
  • the outer peripheral bead side surface 56b and the inner peripheral bead side surface 56c are inclined with respect to the depth direction of the recess 60.
  • the outer peripheral bead side surface 56b extends along the inclined surface 68 of the outer peripheral concave wall surface 63.
  • the outer peripheral bead side surface 56b and the inclined surface 68 have substantially the same inclination angle with respect to the depth direction of the recess 60.
  • the outer peripheral bead side surface 56b and the inclined surface 68 extend in parallel with each other and face each other.
  • the outer peripheral bead side surface 56b and the inclined surface 68 come into contact with each other so as to overlap each other.
  • the contact area between the wall-side beads 551 and 552 and the outer peripheral concave wall surface 63 becomes large. Therefore, the fact that stress is partially concentrated at the contact portion between the wall-side bead 551 and 552 and the outer peripheral concave wall surface 63 is suppressed by the outer peripheral bead side surface 56b extending along the inclined surface 68.
  • the inner peripheral fin side surface 74 of the fin 70 has an inclined surface 78.
  • the configurations, actions, and effects not particularly described in the sixth embodiment are the same as those in the first to third embodiments.
  • the points different from the third embodiment will be mainly described.
  • the inner peripheral fin side surface 74 of the fin 70 has an upright surface 77 and an inclined surface 78.
  • the upright surface 77 forms an end portion on the inner peripheral fin side surface 74 on the concave bottom surface 62 side.
  • the upright surface 77 extends in the depth direction of the recess 60 in the direction intersecting the lower cover 50.
  • the inclined surface 78 is provided on the side opposite to the concave bottom surface 62 via the upright surface 77 in the depth direction of the concave portion 60, and forms an end surface on the inner peripheral fin side surface 74 on the fin tip surface 72 side.
  • the inclined surface 78 extends in a direction in which it is inclined with respect to both the upright surface 77 and the fin tip surface 72, and connects the upright surface 77 and the fin tip surface 72.
  • the inclination of the inclined surface 78 with respect to the depth direction of the recess 60 is larger than the inclination of the upright surface 77 with respect to the depth direction of the recess 60.
  • the vertical cross section of the fin 70 has a shape such that the protruding corners of the inner peripheral fin side surface 74 and the fin tip surface 72 are chamfered by the inclined surface 78.
  • the plurality of beads 55 include beads 55 provided at positions in contact with the inclined surface 78 of the inner peripheral fin side surface 74.
  • each of the upstream fin side bead 555 and the downstream fin side bead 554 is provided at a position where it comes into contact with the inclined surface 78 of the inner peripheral fin side surface 74.
  • the fin-side beads 535 and 554 are provided on the inclined surface 78 side with respect to the upright surface 77 in the depth direction of the recess 60.
  • the fin-side beads 533, 554 and the upright surface 77 are arranged in the depth direction of the recess 60.
  • the fin-side beads 535 and 554 are provided side by side on the inclined surface 78 in the width direction of the floor flow path 32.
  • the tip curved portion 58a on the outer peripheral side is located at the position closest to the inclined surface 78, and is most likely to come into contact with the inclined surface 78.
  • the inclined surface 78 is inclined so that the inclined surface 78 extends along the tip curved portion 58a on the outer peripheral side. Therefore, when the tip curved portion 58a on the outer peripheral side and the inclined surface 78 come into contact with each other, the contact area between the bead 535 and 554 on the fin side and the side surface 74 of the inner peripheral fin tends to increase. Therefore, the fact that stress is partially concentrated at the contact portion between the bead 55 and the inner peripheral fin side surface 74 is suppressed by the contact between the tip curved portion 58a on the outer peripheral side and the inclined surface 78.
  • the inclined surface 78 is inclined with respect to the outer peripheral bead side surface 56b and the inner peripheral bead side surface 56c of the fin side beads 533 and 554.
  • the inclined surface 78 to which the fin side beads 535 and 554 contact is inclined with respect to the depth direction of the recess 60. Therefore, even if the relative positions of the fin-side beads 533 and 554 with respect to the inner peripheral fin side surface 74 are slightly displaced in the width direction of the floor flow path 32 due to manufacturing errors or the like, the fin-side beads 535 and 554 are inside. It is easy to come into contact with the inclined surface 78 of the peripheral fin side surface 74.
  • the contact area between the fin-side bead 533, 554 and the inner peripheral fin side surface 74 tends to be large regardless of which of the outer peripheral side tip curved portion 58a and the outer peripheral bead side surface 56b comes into contact with the inclined surface 78. Therefore, even if the lower cover 50 is deformed, the inclined surface 78 can suppress the stress from being concentrated on a part of the contact portion between the bead 55 and the inner peripheral fin side surface 74.
  • the outer peripheral bead side surface 56b of the bead 55 is inclined with respect to the inclined surface 78 of the fin 70.
  • the outer peripheral bead side surface 56b extends along the inclined surface 78.
  • the shapes of the fin-side beads 535 and 554 are substantially the same as the shapes of the wall-side beads 551 and 552 of the fifth embodiment.
  • the fin-side beads 535 and 554 do not have a curved shape, but have a linear shape as a whole.
  • the fin-side beads 535 and 554 do not have curved portions 58a to 58d, as in the wall-side beads 551 and 552 of the fifth embodiment.
  • the outer peripheral bead side surface 56b and the inner peripheral bead side surface 56c are inclined with respect to the depth direction of the recess 60.
  • the outer peripheral bead side surface 56b extends along the inclined surface 78 of the inner peripheral fin side surface 74.
  • the outer peripheral bead side surface 56b and the inclined surface 78 have substantially the same inclination angle with respect to the depth direction of the recess 60.
  • the outer peripheral bead side surface 56b and the inclined surface 78 extend in parallel with each other and face each other.
  • the outer bead side surface 56b and the inclined surface 78 come into contact with each other so as to overlap each other.
  • the contact area between the fin side beads 535 and 554 and the inner peripheral fin side surface 74 becomes large. Therefore, the fact that stress is partially concentrated at the contact portion between the fin side bead 535, 554 and the inner peripheral fin side surface 74 is suppressed by the outer peripheral bead side surface 56b extending along the inclined surface 78. ..
  • the outer peripheral bead side surface 56b of the bead 55 is in contact with the outer peripheral concave wall surface 63 and the inner peripheral fin side surface 74.
  • the inner peripheral bead side surface 56c of the bead 55 is configured to come into contact with the inner peripheral concave wall surface 64 and the outer peripheral fin side surface 73.
  • the wall-side beads 551 and 552 are provided at positions in contact with the inner peripheral concave wall surface 64 of the recess 60.
  • the wall-side beads 551 and 552 are provided between the fin 70 provided on the innermost peripheral side of the plurality of fins 70 and the inner peripheral floor wall portion 43 in the width direction of the floor flow path 32.
  • the inner peripheral bead side surface 56c of the wall-side beads 551 and 552 and the inner peripheral concave wall surface 64 face each other and come into contact with each other.
  • the inner peripheral concave wall surface 64 corresponds to the intersection surface and the peripheral wall surface.
  • the stress due to the increase in the internal pressure of the floor flow path 32 presses the wall-side beads 551 and 552 against the inner peripheral concave wall surface 64. It works and is applied to the inner peripheral concave wall surface 64 via the wall-side beads 551 and 552. As described above, by applying stress from the lower cover 50 to the inner peripheral concave wall surface 64, it is unlikely that the stress is concentrated on a part such as the inner peripheral end of the joint portion 37 in the lower cover 50.
  • the upstream wall-side bead 551 is provided at a position in contact with the inner peripheral concave wall surface 64 of the upstream recess 601.
  • the upstream wall side bead 551 is provided between the inner peripheral joint plate portion 53 and the upstream flow path plate portion 541 in the width direction of the upper flow path 32a, and these inner peripheral joint plate portion 53 and the upstream flow path plate portion 541 are provided. Is connected to.
  • the downstream wall-side bead 552 is provided at a position in contact with the inner peripheral concave wall surface 64 of the downstream recess 602.
  • the downstream wall-side bead 552 is provided between the inner peripheral joint plate portion 53 and the downstream flow path plate portion 542 in the width direction of the lower flow path 32b, and these inner peripheral joint plate portions 53 and the downstream flow path plate portion 542. Is connected to.
  • the fin-side beads 535 and 554 are provided at positions in contact with the outer peripheral fin side surface 73 of the fin 70.
  • a plurality of fin-side beads 535 and 554 are provided side by side in the width direction of the floor flow path 32.
  • the plurality of fin-side beads 535 and 554 include a fin-side bead 535 and 554 provided between the outermost fin 70 and the outer peripheral concave wall surface 63 among the plurality of fins 70, and two adjacent fins 70.
  • the fin-side beads 533 and 554 provided between them are included.
  • the inner peripheral bead side surface 56c of the fin side bead 535, 554 faces the outer peripheral fin side surface 73 and comes into contact with the outer peripheral fin side surface 73.
  • the outer peripheral bead side surface 56b faces the outer peripheral concave wall surface 63 and the inner peripheral fin side surface 74 of the adjacent fin 70, and is separated from the outer peripheral concave wall surface 63 and the inner peripheral fin side surface 74 in the width direction of the floor flow path 32. ing.
  • the outer peripheral fin side surface 73 corresponds to the intersection surface and the fin side surface.
  • the stress due to the increase in the internal pressure of the floor flow path 32 acts to press the fin-side beads 533 and 554 against the outer peripheral fin side surface 73.
  • This stress is applied to the outer peripheral fin side surface 73 via the fin side beads 533, 554.
  • stress is applied from the lower cover 50 to the outer peripheral fin side surface 73, it is unlikely that the stress is concentrated on a part such as the inner peripheral end of the joint portion 37 in the lower cover 50.
  • the upstream fin-side bead 555 is provided at a position where it comes into contact with the outer peripheral fin side surface 73 of the upstream fin 701.
  • the downstream fin side bead 554 is provided at a position in contact with the outer peripheral fin side surface 73 of the downstream fin 702.
  • the manufacturing method of the case 20 in the eighth embodiment will be described.
  • the inner peripheral floor wall portion 43 is fitted between the upstream wall side bead 551 and the downstream wall side bead 552.
  • the upstream fin 701 and the downstream fin 702 are fitted between the upstream fin side bead 555 and the downstream fin side bead 554.
  • the wall-side beads 551 and 552 come into contact with the inner peripheral concave wall surface 64
  • the fin-side beads 535 and 554 come into contact with the outer peripheral fin side surfaces 73, so that the position of the lower cover 50 with respect to the case body 40 in the Z direction is obtained. The deviation is suppressed.
  • the wall-side beads 551 and 552 are in contact with the inner peripheral concave wall surface 64, and the fin-side beads 533 and 554 are in contact with the outer peripheral fin side surface 73. Therefore, the stress generated by the linear expansion of the lower cover 50 or the like is applied to the inner peripheral concave wall surface 64 from the wall-side beads 551 and 552, and the outer circumference from the fin-side beads 533 and 554, as in the completed power conversion device 10. It is easy to be applied to the fin side surface 73. As a result, the plastic deformation of the lower cover 50 is suppressed.
  • the wall-side beads 551 and 552 extending in the direction intersecting the flow path plate portion 54 and the inner peripheral concave wall surface 64 extending in the direction intersecting the flow path plate portion 54 come into contact with each other. Therefore, even if stress is generated due to an increase in the internal pressure of the floor flow path 32 or a linear expansion of the lower cover 50, this stress is applied to the inner peripheral concave wall surface 64 from the wall-side beads 551 and 552. Therefore, the plastic deformation of the lower cover 50 can be suppressed by the wall-side beads 551 and 552.
  • the wall-side beads 551 and 552 are in contact with the inner peripheral concave wall surface 64. Therefore, even if stress is generated due to an increase in the internal pressure of the floor flow path 32, stress is applied to the inner peripheral concave wall surface 64 from the wall-side beads 551 and 552 without waiting for elastic deformation of the lower cover 50 due to this stress. .. Therefore, stress can be more reliably applied from the lower cover 50 to the inner peripheral concave wall surface 64. Therefore, similarly to the first embodiment, it is possible to more reliably suppress the concentration of stress on a part of the lower cover 50.
  • the inner peripheral concave wall surface 64 in contact with the wall-side beads 551 and 552 forms the peripheral edge portion of the floor flow path 32.
  • the stress applied to the inner peripheral concave wall surface 64 from the wall-side beads 551 and 552 is applied to the inner peripheral floor wall portion 43 forming the inner peripheral concave wall surface 64.
  • the inner peripheral floor wall portion 43 has a higher strength than the fin 70, for example, because it has a larger volume and forms a lower surface 41a of the main body. Therefore, even if stress is applied to the inner peripheral concave wall surface 64 from the wall-side beads 551 and 552, it is less likely that the inner peripheral floor wall portion 43 is deformed by this stress. Therefore, the floor flow path 32 formed by the inner peripheral floor wall portion 43 can be maintained in an appropriate state.
  • the contact area between the wall-side bead 551 and 552 and the outer peripheral bead side surface 56b tends to be large. .. Therefore, it is unlikely that stress is concentrated on a part of the contact portion between the wall-side beads 551 and 552 and the inner peripheral concave wall surface 64. Therefore, it is possible to suppress that the portion of the wall-side bead 551,552 in contact with the inner peripheral concave wall surface 64 is locally deformed to cause plastic deformation of the wall-side bead 551,552.
  • the fin-side beads 535, 554 extending in the direction intersecting the flow path plate portion 54 and the outer peripheral fin side surface 73 extending in the direction intersecting the flow path plate portion 54 come into contact with each other. Therefore, even if stress is generated due to an increase in the internal pressure of the floor flow path 32 or linear expansion of the lower cover 50, this stress is applied to the outer peripheral fin side surface 73 from the fin side beads 533, 554. Therefore, similarly to the second embodiment, the lower cover 50 can be prevented from being plastically deformed.
  • the fin-side beads 535 and 554 are in contact with the outer peripheral fin side surface 73. Therefore, even if stress is generated due to an increase in the internal pressure of the floor flow path 32, stress is applied to the outer peripheral fin side surface 73 from the fin side beads 533 and 554 without waiting for elastic deformation of the lower cover 50 due to this stress. Therefore, stress can be more reliably applied from the lower cover 50 to the outer peripheral fin side surface 73. Therefore, similarly to the second embodiment, it is possible to more reliably suppress the concentration of stress on a part of the lower cover 50.
  • the outer peripheral fin side surface 73 is included in the fin outer surface 71 of the fin 70.
  • the stress applied to the outer peripheral fin side surface 73 from the fin side beads 533, 554 is applied to the fin 70. Therefore, as in the second embodiment, the fin 70 expands the contact area between the concave inner surface 61 of the recess 60 and the refrigerant in the floor flow path 32 to enhance the cooling effect of the refrigerant, and the local area of the lower cover 50. It is possible to realize both of suppressing the deformation.
  • the contact area between the fin side bead 535, 554 and the fin 70 tends to be large. .. Therefore, it is unlikely that stress is concentrated on a part of the contact portion between the fin side bead 535, 554 and the outer peripheral fin side surface 73. Therefore, similarly to the second embodiment, it is possible to suppress that the portion of the fin-side bead 535, 554 that is in contact with the fin 70 is locally deformed to cause plastic deformation of the fin-side bead 535, 554.
  • the wall so that the opening of the bead inner surface 57 faces the outer peripheral concave wall surface 63 side.
  • the side beads 551 and 552 and the fin side beads 535 and 554 are tilted.
  • the inner peripheral bead side surface 56c of the wall-side beads 551 and 552 and the tip curved portion 58b on the inner peripheral side are likely to be pressed against the inner peripheral concave wall surface 64. ..
  • the wall-side beads 551 and 552 are surely in contact with the inner peripheral concave wall surface 64.
  • the inner peripheral bead side surface 56c of the fin-side beads 533, 554 and the tip curved portion 58b on the inner peripheral side are likely to be pressed against the outer peripheral fin side surface 73. Therefore, it is possible to realize a configuration in which the fin-side beads 535 and 554 are surely in contact with the outer peripheral fin side surface 73.
  • the wall-side beads 551 and 552 are provided at positions where they come into contact with the outer peripheral concave wall surface 63.
  • the wall-side beads 551 and 552 are provided at positions where they come into contact with the inner peripheral concave wall surface 64.
  • the wall-side beads 551 and 552 are provided at positions in contact with the outer peripheral concave wall surface 63 and positions in contact with the inner peripheral concave wall surface 64, respectively.
  • the configurations, actions, and effects not particularly described in the ninth embodiment are the same as those in the first and eighth embodiments. In the ninth embodiment, the points different from the first and eighth embodiments will be mainly described.
  • a plurality of wall-side beads 551 and 552 are arranged in the width direction of the floor flow path 32.
  • two wall-side beads 551 and 552 are arranged in the width direction of the floor flow path 32.
  • a flow path plate portion 54 is provided between the two wall-side beads 551 and 552.
  • the flow path plate portion 54 connects two wall-side beads 551 and 552.
  • the outer peripheral-side wall-side beads 551 and 552 are provided at positions in contact with the outer peripheral concave wall surface 63.
  • the wall-side beads 551 and 552 on the inner peripheral side are provided at positions in contact with the inner peripheral concave wall surface 64.
  • the upstream flow path plate portion 541 is provided between the two upstream wall side beads 551, and these upstream wall side beads 551 are connected to each other.
  • the outer peripheral side upstream wall-side bead 551 contacts the outer peripheral concave wall surface 63
  • the inner peripheral side upstream wall-side bead 551 contacts the inner peripheral concave wall surface 64.
  • downstream flow path plate portion 542 is provided between the two downstream wall side beads 552, and these downstream wall side beads 552 are connected to each other.
  • the downstream wall-side bead 552 on the outer peripheral side contacts the outer peripheral concave wall surface 63
  • the downstream wall-side bead 552 on the inner peripheral side contacts the inner peripheral wall surface.
  • the flow path plate portion 54 is provided at a height position different from that of the joint plate portions 52 and 53 in the depth direction of the recess 60.
  • the flow path plate portion 54 is provided at a position closer to the concave bottom surface 62 than the joint plate portions 52 and 53 in the depth direction of the recess 60.
  • the height dimension of the fin 70 is smaller than the depth dimension of the recess 60.
  • the flow path plate portion 54 is in a state of being overlapped with the fin tip surface 72 of the fin 70, as in the first embodiment.
  • the wall-side beads 551 and 552 extend in the depth direction of the recess 60 so as to be passed over the joint plate portions 52 and 53 and the flow path plate portion 54.
  • the wall-side beads 551 and 552 extend from the flow path plate portion 54 toward the side opposite to the concave bottom surface 62, and extend from the joint plate portions 52 and 53 toward the concave bottom surface 62.
  • the wall-side beads 551 and 552 have a curved shape as a whole.
  • the wall-side beads 551 and 552 on the outer peripheral side include the outer peripheral bead side surface 56b, the tip curved portion 58a on the outer peripheral side, and the proximal end curved portion 58c on the outer peripheral side among the wall-side beads 551 and 552 of the first embodiment. It has a shape as if it was formed by.
  • the wall-side beads 551 and 552 on the inner peripheral side are the inner peripheral bead side surface 56c, the tip curved portion 58b on the inner peripheral side, and the base end on the inner peripheral side among the wall-side beads 551 and 552 of the first embodiment. It has a shape as if it were formed by the curved portion 58d.
  • the manufacturing method of the case 20 in the ninth embodiment will be described.
  • the wall-side beads 551 and 552 are fitted between the outer peripheral concave wall surface 63 and the inner peripheral concave wall surface 64 of the concave portion 60 together with the flow path plate portion 54. It is in a state of being.
  • the wall-side beads 551 and 552 come into contact with the concave wall surfaces 63 and 64, the displacement of the lower cover 50 with respect to the case body 40 in the Z direction is suppressed.
  • the bead 55 is provided at a position where it comes into contact with the concave wall surfaces 63 and 64.
  • the bead 55 is provided at a position where the bead 55 comes into contact with the fin side surfaces 73 and 74.
  • the bead 55 is provided at a position separated from any of the concave wall surfaces 63 and 64 and the fin side surfaces 73 and 74.
  • the bead 55 is not provided at any of the positions where the bead 55 contacts the concave wall surfaces 63 and 64 and the fin side surfaces 73 and 74.
  • the bead 55 is provided at a position separated from any of the concave wall surfaces 63 and 64 and the fin side surfaces 73 and 74 in the width direction of the floor flow path 32. That is, the bead 55 is provided at a position where it does not come into contact with any of the concave wall surfaces 63 and 64 and the fin side surfaces 73 and 74.
  • the bead 55 that does not come into contact with any of the concave wall surface 63, 64 and the fin side surface 73, 74 is also referred to as a separated bead 555,556.
  • the upstream separated bead 555 is provided with respect to the upper flow path 32a
  • the downstream separated bead 556 is provided with respect to the lower flow path 32b.
  • the separated beads 555,556 correspond to the connecting portion and the separated connecting portion.
  • a plurality of separated beads 555 and 556 are arranged in the width direction of the floor flow path 32. Fins 70 are provided between two adjacent separated beads 555 and 556 in the width direction of the floor flow path 32.
  • the separation beads 555 and 556 are not directly connected to the joint plate portions 52 and 53, but are indirectly connected to the joint plate portions 52 and 53 via the flow path plate portion 54.
  • Two separated beads 555 and 556 adjacent to each other in the width direction of the floor flow path 32 are connected by a flow path plate portion 54.
  • the separated beads 555 and 556 have a curved shape as a whole.
  • the separated beads 555 and 556 are easily deformed by this stress.
  • the stress is concentrated on a part such as the inner peripheral end of the joint portion 37 in the lower cover 50. Therefore, in the lower cover 50, stress is concentrated on a part of the joint plate portions 52, 53 and the flow path plate portion 54, and these joint plate portions 52, 53 and the flow path plate portion 54 are locally deformed and plastically deformed. Can be suppressed.
  • the separated beads 555 and 556 are curved, the entire separated beads 555 and 556 are easily elastically deformed. Therefore, when stress is applied to the separated beads 555 and 556, the entire separated beads 555 and 556 are elastically deformed, so that it is unlikely that the stress is concentrated on a part of the separated beads 555 and 556. Therefore, it is possible to prevent the separated beads 555 and 556 from being locally deformed to cause plastic deformation of the separated beads 555 and 556.
  • Disclosure of this specification is not limited to the exemplary embodiments. Disclosures include exemplary embodiments and modifications by those skilled in the art based on them. For example, the disclosure is not limited to the combination of parts and elements shown in the embodiment, and can be variously modified and carried out. Disclosure can be carried out in various combinations. The disclosure can have additional parts that can be added to the embodiment. The disclosure includes the parts and elements of the embodiment omitted. Disclosures include replacements or combinations of parts, elements between one embodiment and another.
  • the technical scope disclosed is not limited to the description of the embodiments. The technical scope disclosed is indicated by the description of the scope of claims and should be understood to include all changes within the meaning and scope equivalent to the description of the scope of claims.
  • the bead 55 may extend from the flow path plate portion 54 or the joint plate portions 52, 53 toward the inside of the recess 60 as long as it extends in a direction intersecting the flow path plate portion 54. , May extend toward the side opposite to the recess 60.
  • the bead 55 may protrude in the lower cover 50 toward the side opposite to the recess 60.
  • the bead 55 may protrude from the flow path plate portion 54 toward the recess 60 side, and the bead 55 protrudes from the joint plate portions 52, 53 toward the side opposite to the recess 60. May be.
  • the bead 55 is directed toward the recess 60 side from at least one of the joint plate portions 52, 53 and the flow path plate portion 54. It is preferable that the wall is extended. For example, if the bead outer surface 56 of the bead 55 extends toward the concave portion 60 side, it is possible to realize a configuration in which the bead 55 contacts the concave wall surface 63, 64 and the fin side surfaces 73, 74. In this configuration, the bead 55 may not have the bead inner surface 57, and the bead 55 may project toward both the recess 60 side and the side opposite to the recess 60.
  • the bead 55 does not have to be curved as long as it extends in the direction intersecting the flow path plate portion 54.
  • the vertical cross section of the bead 55 may have a linear shape.
  • the bead 55 may have a shape in which at least a part thereof is curved in its vertical cross section.
  • the bead 55 has at least one of the tip curved portions 58a and 58b and the proximal end curved portions 58c and 58d, at least a part of the bead 55 is curved in its vertical cross section. Become.
  • the bead 55 may have a vertically long flat shape instead of a wide flat shape.
  • the height dimension in the Y direction may be larger than the width dimension in the Z direction.
  • the bead side surfaces 56b and 56c are made as long as possible in the Y direction, so that the contact area between the bead side surfaces 56b and 56c and the concave wall surfaces 63 and 64 and the fin side surfaces 73 and 74 can be expanded.
  • a plurality of beads 55 may be provided in a flow path such as the floor flow path 32, or only one bead 55 may be provided.
  • the bead 55 may be in a state of being passed over the curved path 32c and across the upper flow path 32a and the lower flow path 32b.
  • the portion arranged in the upper flow path 32a corresponds to the first connection portion
  • the portion arranged in the lower flow path 32b corresponds to the second connection portion.
  • the bead 55 may extend in a direction intersecting the upstream and downstream directions of the floor flow path 32.
  • a plurality of fins 70 may be provided in the width direction of the floor flow path 32, or only one fin 70 may be provided. Further, a plurality of fins 70 may be arranged in the upstream and downstream directions of the floor flow path 32.
  • the fin 70 may have a shape or size in which the fin tip surface 72 is separated from the lower cover 50 toward the concave bottom surface 62. Further, the fin 70 may not be arranged between two adjacent beads 55 in the width direction of the floor flow path 32. In other words, a plurality of beads 55 may be arranged in the width direction of the floor flow path 32 between two fins 70 adjacent to each other in the width direction of the floor flow path 32.
  • the direction in which the refrigerant flows may not be reversed between the upper flow path 32a as the first flow path and the lower flow path 32b as the second flow path.
  • the direction in which the refrigerant flows may be the same in the upper flow path 32a and the lower flow path 32b.
  • the first flow path and the second flow path may not be arranged in the upstream / downstream direction, but may be arranged in parallel with respect to the upstream / downstream direction.
  • the portion where the lower cover 50 is joined by the joining portion 37 corresponds to the partition portion, and the portion where the lower cover 50 is not joined corresponds to the fin.
  • the first flow path and the second flow path may not be arranged side by side.
  • the floor flow path 32 may have only one flow path extending in the X direction. Further, the flow path does not extend straight like the upper flow path 32a and the lower flow path 32b, but may be curved or bent.
  • the case 20 may be made of a resin material or the like as long as it is possible to form a flow path through which the fluid flows.
  • the flow path cover such as the lower cover 50 may form the floor upper surface 23a instead of the floor lower surface 23b. That is, the opening of the recess 60 may not face the side opposite to the internal space 21, but may face the internal space 21.
  • the upper surface of the main body floor portion 41 corresponds to the main body surface.
  • the portion where the flow path is provided does not have to be the case outer wall 24 as long as it is a portion that partitions the internal space 21.
  • the flow path may be provided on the outer wall 24 of the case.
  • a flow path may be provided in the ceiling portion or the partition portion.
  • the flow path cover forms the inner wall surface and the outer wall surface of the case outer wall 24.
  • the fluid flowing through the flow path formed by the case 20 does not exert a cooling effect but a heating effect if it is possible to exchange heat with the air and electrical components in the case 20. May be demonstrated.
  • the device including the case 20 may be referred to as a heater instead of the cooler 30.
  • the case 20 and the power conversion device 10 may have a configuration that is not intended to cause the fluid to exchange heat with the air or electric parts in the case 20.
  • the thermal conductivity of the case body 40 and the lower cover 50 may be low.
  • examples of the electrical components housed in the case 20 include a transformer, a motor, a bus bar, a terminal block, and the like, in addition to the converter unit 15.
  • Examples of the electric device provided with the electric component include a transformer device provided with a transformer, a motor device provided with a motor, and the like, in addition to the power conversion device 10.
  • Examples of the power conversion device 10 include an inverter device, a power supply device for AC input / DC output, a power supply device for DC input / DC output, and a power supply device for AC input / AC output, in addition to the converter device.
  • the vehicle on which the power conversion device 10 is mounted includes a passenger car, a bus, a construction work vehicle, an agricultural machine vehicle, and the like. Further, the vehicle is one of the moving bodies, and the moving body on which the power conversion device 10 is mounted includes a train, an airplane, and the like in addition to the vehicle.
  • the power conversion device 10 and the case 20 are mobile electric devices and cases mounted on a moving body such as a vehicle, but may be stationary electric devices and cases.

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  • Inverter Devices (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Casings For Electric Apparatus (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
PCT/JP2021/036581 2020-11-19 2021-10-04 ケース及び電気装置 Ceased WO2022107464A1 (ja)

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JP7552520B2 (ja) * 2021-07-05 2024-09-18 株式会社デンソー ケースおよび電気装置
TWI859751B (zh) * 2023-03-01 2024-10-21 和碩聯合科技股份有限公司 水冷結構

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JP2022081189A (ja) 2022-05-31

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