JP2017103837A - Power conversion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power conversion device which directly fits a housing of a power conditioner to an outer wall of a house, and can prevent infiltration of rainwater into the housing and form an air flow for effectively exercising a heat radiation action on heating portions of various kinds of electrical components equipped in the housing and perform cleaning and exchange of a filter provided in an air intake port by a person who is not qualified as an electrician.SOLUTION: Right and left air flow-in ports 12 are provided at an intermediate portion between the left and right walls of a main body 3 or at the lower portion of the main body 3, and an air exhaust port 13 is provided in the lower wall. An air introducing port 15 intercommunicating with the air flow-in ports is formed on the lower side, and an air intake cover 14 having a dust-proof filter 15F is provided at the air introducing port so as to be freely detachably fitted to the outer surfaces of the right and left walls of the main body while covering each of the right and left air flow-in ports. The operation of heat radiating fans 10 and 11 forms an air stream in which the outside air flowing in from the right and left air flow-in ports is exhausted from the air exhaust port to the outside of the housing while promoting heat dissipation of electric parts.SELECTED DRAWING: Figure 6

Description

The present invention relates to a power conversion device that converts DC power obtained from renewable energy such as sunlight into AC power.

A power conversion device (referred to as a power conditioner) for a photovoltaic power generation system includes an orthogonal conversion circuit that converts DC power generated by a solar cell into AC power, and a power module that constitutes the orthogonal conversion circuit. A device having a heat sink or the like to which (a heat-generating semiconductor switching element) is attached is known (Patent Document 1).

When installing the inverter on the exterior wall of the building or installing it on an outdoor stand, it is important to prevent rainwater from entering the inverter because it is exposed to wind and rain. It is also important to improve the heat dissipation of heat-generating parts such as
The operation of the fan forcibly takes outside air into the housing to promote heat dissipation of the heat generating component (Patent Document 1).
In the case of Patent Document 1, an air intake section is provided on the bottom wall of the casing, an exhaust section having exhaust fans is provided on the upper left and right side walls, and external air is forcibly taken into the casing by the operation of the exhaust fan. Promotes heat dissipation. In this case, the intake portion is provided with a suction duct in the housing, and flows into the housing through a filter provided at the outlet portion at the top of the duct.

JP 2013-125864 A

Thus, in the case of Patent Document 1, a suction duct is provided in the housing in the intake portion, and the outside air is a mechanism that flows into the housing through a filter provided in an outlet portion at the top of the duct.
When cleaning or replacing the filter, it is necessary to open the front door and perform the work, and there is a risk of contact with internal electrical components. For this reason, it is not possible to perform the work unless it is a qualified electrician.
If it is done by an electrician, it will cost a certain amount of money, and maintenance costs will increase.

Some filters have many small holes in the upper part of the back wall of the housing body, and others have many small holes in the bottom wall of the housing body. After installation, when cleaning or replacing the filter, it is necessary to remove the inverter, and a qualified electrician will be required to perform the work. Become.
That is, it is necessary to arrange a special qualification holder for maintenance, and the maintenance cannot be performed easily and timely when necessary, and the capacity of the power conversion device may be reduced due to filter clogging.

In view of these points, the present invention can easily perform maintenance such as cleaning and replacement of the filter as needed without requiring special qualification for maintenance, and can reduce the maintenance cost. A conversion device is provided.
For this reason, it is possible to prevent the invasion of rainwater into the interior of the inverter, and to provide a positive air flow to effectively exert the heat radiation action of the heat generating parts of various electrical components provided inside the enclosure. It is an object of the present invention to provide an outdoor installation type power conversion device having a structure that can be formed and worked even by a person who is not qualified as an electrician to clean or replace a filter.

The present invention includes a main body having a front opening surrounded by upper and lower walls, left and right walls, and a back wall, and a door that is attached to one side of the front opening of the main body so as to be freely opened and closed, and closes the front opening periphery through packing. A casing in which the back wall of the main body is vertically arranged along a wall of a gantry or a building, and DC power stored in the casing and obtained from renewable energy is converted into AC power that can be superimposed on a system In a power conversion device comprising an electrical component constituting a power conversion circuit, and a heat dissipation fan for the electrical component,
The main body includes left and right air inlets formed near or at the lower side of the left and right walls and an air outlet formed on the lower wall,
An air inlet that communicates with the air inlet is formed facing downward, and the air inlet has a filter, and is attached to and detached from the outer surface of the left and right walls from outside while covering the left and right air inlets. Air intake cover that can be attached freely,
By operating the heat dissipating fan, the outside air flowing in from the left and right air inlets forms a flow of air exhausted from the air outlet to the outside of the housing while promoting heat dissipation of the electrical components. To do.

Further, the present invention provides a heat sink in which a heat-generating semiconductor element of the electrical component is attached to a substrate portion in a heat conductive state, and a heat sink fin of the heat sink is accommodated, and an upper end opening is an air inlet and a lower end opening is an air outlet. An air duct having the heat radiating fan attached to the upper end opening is provided in the main body so as to form an air flow flowing in the vertical direction through the heat radiating fins.

The air intake cover is located at a position intermediate between the air inlet and the air inlet.
A rain barrier that extends from the left wall and the right wall of the main body to the vicinity of the side wall of the air intake cover while being inclined toward the air inlet is provided.

According to the present invention, in a power converter configured to convert DC power obtained from renewable energy into predetermined AC power synchronized with a commercial power system and to be superimposed on the commercial power system,
Prevents rainwater from entering the housing, and forms a positive air flow to effectively demonstrate the heat dissipation of the heat generating parts of the electrical components provided inside the housing, and cleans the filter Even those who do not have the qualification of an electrician can work. For this reason, it is possible to provide a power conversion device that can ensure stable operation and achieve low maintenance costs.

Further, according to the present invention, the heat-dissipating fan is attached to the upper end opening of the air duct provided in the main body, thereby suppressing the temperature rise of the heat-dissipating fan and the heat-generating electricity attached to the substrate portion of the heat sink. It is possible to provide a power converter that can effectively dissipate parts, ensure stable operation, and reduce maintenance costs.

In addition, the air intake cover of the present invention has a rain barrier provided at an intermediate portion between the air inlet and the air inlet, so that rainwater blown from the air inlet serves as a barrier. However, since the outside air flows from the gap between the tip of the rain barrier and the side wall of the air intake cover, the outside air can be taken in well, ensuring stable operation and low maintenance costs. It is possible to provide a power conversion device that can be realized.

It is a front perspective view which shows a state when the door of the power converter device which concerns on embodiment of this invention is opened. It is a disassembled perspective view which shows the state which removed the two cover plates which cover the power converter circuit INV accommodated in the main body of the power converter device shown in FIG. It is a front perspective view which shows the state which removed the chassis from the state of FIG. 2 in a cross section. It is a longitudinal cross-sectional view which shows the inside of the 1st duct arrange | positioned in the main body of the power converter device shown in FIG. 1, and a 2nd duct. It is a cross-sectional front view which shows the inside of the 1st duct arrange | positioned in the main body of a power converter device, and a 2nd duct. It is a perspective view which shows the inside of the 1st duct arrange | positioned in the main body of a power converter device, and a 2nd duct. It is a perspective view of the longitudinal section which shows the inside of the air intake cover attached to the left and right side walls of the main body of the power converter. It is explanatory drawing of the state which attached the IPM modularized in the form by which the switching element in the power converter circuit INV of a power converter device is accommodated in one package to the board | substrate part of a heat sink. It is a block diagram of the power converter circuit INV of a power converter device. It is explanatory drawing of the state which attached the power converter device to the outer wall of a building.

The present invention includes a main body having a front opening surrounded by upper and lower walls, left and right walls, and a back wall, and a door that is attached to one side of the front opening of the main body so as to be freely opened and closed, and closes the front opening periphery through packing. A casing in which the back wall of the main body is vertically arranged along a wall of a gantry or a building, and DC power stored in the casing and obtained from renewable energy is converted into AC power that can be superimposed on a system In a power conversion device comprising an electrical component constituting a power conversion circuit, and a heat dissipation fan for the electrical component,
The main body includes left and right air inlets formed near or at the lower side of the left and right walls and an air outlet formed on the lower wall,
An air inlet that communicates with the air inlet is formed facing downward, and the air inlet has a filter, and is attached to and detached from the outer surface of the left and right walls from outside while covering the left and right air inlets. Air intake cover that can be attached freely,
By the operation of the heat dissipating fan, the outside air flowing in from the left and right air inlets forms a flow of air exhausted from the air outlet to the outside of the housing while promoting heat dissipation of the electrical components.
The embodiment will be described below with reference to the drawings.

In the power conversion device 1 according to an embodiment of the present invention, an electrical component that constitutes a power conversion circuit INV that converts DC power obtained from renewable energy into AC that can be superimposed on a commercial power system is housed in the housing 2. Has been. The housing 2 is constituted by a main body 3 and a door 4, and the main body 3 includes an upper wall 3.
A, a lower box 3B, a left wall 3C, a right wall 3D, and a back wall 3E are surrounded by a rectangular box having a front opening 3F. The door 4 can be opened and closed by a hinge 5 on one side of the main body 3. It is the structure which is attached and locked to the main body 3 by the locking device R.

As shown in FIG. 1, in order to close the front opening 3F of the main body 3 in a watertight state by the door 4,
The flange 6 around the periphery of the front opening 3 </ b> F and the rear surface of the door 4 are in close contact with each other via an annular packing (integrated or divided packing) 30. In the embodiment, when the door 4 is closed, the annular packing 30 attached to the peripheral edge of the back surface of the door 4 achieves a watertight state by being in close contact with the flange 6, but the configuration in which the annular packing 30 is attached to the flange 6. But you can. As described below,
Except for the air inlets 12 provided on the left and right side walls 3C and 3D of the main body 3, the air outlet 13 provided on the lower wall 3B of the main body 3, and the necessary openings and holes such as the wiring introduction pipes 27 and 28, the main body 3 Front opening 3
In a state where F is closed by the door 4, the inside of the housing 2 is in a watertight state.

As shown in FIG. 10, the power conversion device 1 includes a mounting portion 3 </ b> T provided at the rear portion of the main body 3 so that the back wall 3 </ b> E of the main body 3 is vertically arranged along the outer wall of the building K. Attached to the outer wall. The power conversion apparatus 1 may be attached to a stand for standing or attached to an inner wall in a dedicated building.

The power conversion circuit INV of the power conversion device 1 is accommodated in the main body 3, and is covered with two cover plates 20A and 20B that cover the power conversion circuit INV with the door 4 open as shown in FIG. It has been broken. In this state, a display 21 described later faces the window 20A1 of the cover plate 20A so as to be visible from the front. When the cover plates 20A and 20B are removed, the power conversion circuit INV is exposed as shown in FIG. 2, and the control circuit 6 in the power conversion circuit INV disposed on the front surface of the chassis 25 is exposed.
4 circuit board 64P, display 21 for displaying the operating state of power conversion circuit INV and related circuits, breaker 22 that also serves as a wiring terminal block for solar cell PV and power conversion circuit INV, power conversion circuit INV and commercial use Breaker 23 that also serves as a terminal block for wiring with the power system (GRID) 63
, And other electrical components of the power conversion circuit INV can be seen from the front.

Each of the breakers 22 and 23 is provided with a mechanism for interrupting the electric circuit by an overcurrent inside, and the operation parts 22S and 23S that rotate downward when the electric circuit is interrupted pass through the window of the cover plate 20B. Is exposed. In order to return the interrupted electric circuit to the connected state, the operation units 22S and 23S operated downward may be manually rotated upward.

FIG. 9 shows a main configuration of the power conversion circuit INV of the power conversion device 1. The DC power generated by the solar cell PV passes through the DC noise filter 50, passes through a noise absorbing capacitor 51 made up of a plurality of small capacitors, and is connected to a DC reactor 52 constituted by one reactor L1. A three-phase circuit including a rectifier circuit 56 including a bridge circuit of a diode D and a three-phase AC conversion switching circuit 57. A high-frequency component is cut by a low-pass filter 61 including an AC reactor 58 configured by three reactors L2 to L4 and a capacitor circuit 59 configured by three capacitors 59A. A sine wave having a frequency synchronized with the frequency of a predetermined commercial power system (GRID) 63 can be superimposed 3 As AC, it is configured to be output to the commercial power system (GRID) 63 via the relay contact 62. The operation of the DC / AC conversion switching circuit 53, the three-phase AC conversion switching circuit 57, and the relay contact 62 is controlled by the control circuit 64.

The switching circuit 53 for DC / AC conversion is usually a switching element 5 called IGBT.
3M-53D, modularized in a form that is housed in a single package,
(Intelligent power module). The switching circuit 57 for three-phase alternating current conversion also includes switching elements 57A to 57F that are usually referred to as IGBTs, is modularized in a form accommodated in one package, and is referred to as an IPM (intelligent power module). The former is referred to as a first IPM and the latter is referred to as a second IPM.
Each switching element may be formed as a discrete circuit without being modularized. In this case, each switching element corresponds to a heat generating member.

Among the electrical components constituting the power conversion circuit INV in this way, the first IPM, the second IPM,
The direct current reactor 52, the high frequency transformer 55, the diode D of the rectifier circuit 56, and the alternating current reactor 58 are components that generate large amounts of heat. In particular, the switching element generates a large amount of heat, and is attached to a heat sink 7 having good thermal conductivity, such as aluminum, in order to promote heat dissipation of the first IPM and the second IPM that accommodate it. As shown in FIG.
The first IPM and the second I have a board part 7A and a plurality of heat radiation fins 7B extending from the board part 7A.
In the PM, the metal heat radiation surface such as aluminum on the back side is in a heat conduction state on the front surface of the substrate portion 7A.
Attach with screws 24.

Since the diode D of the rectifier circuit 56 also generates a large amount of heat, it is configured to be modularized in a form accommodated in a single package, as in the case of the IPM, so that heat dissipation is effective. Attach with screws.
If the diode D of the rectifier circuit 56 is included in the first IPM or the second IPM and packaged, the work of attaching the heat sink 7 to the substrate portion 7A becomes easy.

As shown in FIGS. 3 to 6, a heat dissipation device for the power conversion circuit INV is disposed in the main body 3 of the housing 2. That is, a vertical first air duct 8 having an upper end opening as an air inlet and a lower end opening as an air outlet, and a vertical second air duct 9 having an upper end opening as an air inlet and a lower end opening as an air outlet are provided side by side. doing. A first heat radiating fan 10 is disposed at the upper end opening or lower end opening of the first air duct 8, and a second heat radiating fan 11 is disposed at the upper end opening or lower end opening of the second air duct 9. These constitute the heat dissipation device of the power conversion circuit INV.

As shown in FIG. 4, a mounting plate 26 is attached in parallel to the back wall 3 </ b> E in a state of floating from the back wall 3 </ b> E in the main body 3. The mounting plate 26 is detachably attached to the back wall 3E of the main body 3 via spacers with upper and lower left and right portions of the mounting plate 26 using screws.
The power conversion circuit INV and its heat dissipation device are arranged on the front surface of the mounting plate 26. That is, as shown in FIG. 5 and the like, the first air duct 8 to which the heat sink 7 and the first fan 10 are attached and the second air duct 9 to which the second fan 11 is attached are arranged on the front surface of the mounting plate 26. . Three reactors L <b> 2 to L <b> 4 of the AC reactor 58 are arranged in the vertical direction on the front surface of the mounting plate 26 on the side of the first air duct 8 and the second air duct 9. Further, the chassis 25 is placed on the mounting plate 26 so as to cover the first air duct 8, the second air duct 9 and the AC reactor 58.
Attached to the front of the.

For this reason, in a state where the power conversion circuit INV and its heat dissipation device are arranged on the mounting plate 26,
The mounting plate 32 can be attached to the back wall 3E of the main body 3 by the mounting portion 32,
If the mounting plate 26 is removed by the attachment portion 32, the power conversion circuit INV and its heat dissipation device can be removed from the main body 3 at a time, which facilitates assembly and maintenance.

As described above, the first air duct 8 is attached to the front surface of the mounting plate 26 with the lower end in contact with the lower wall 3 </ b> B of the main body 3, and the substrate portion 7 </ b> A of the heat sink 7 is attached to the first air duct 8. The heat dissipating fins 7B of the heat sink 7 are disposed in the first air duct 8 so as to constitute a part of the front wall 8A (mostly in the embodiment). As a result, the diode D of the rectifier circuit 56, the first I
PM and 2nd IPM are the states attached to the front surface of the board | substrate part 7A of the heat sink 7 in the heat conductive state.

The second air duct 9 is attached to the front surface of the mounting plate 26 in a state where the lower end is in contact with the lower wall 3B of the main body 3. Of the electric components constituting the power conversion circuit INV, the second air duct 9 is other than a heat-generating semiconductor element. Contains exothermic electrical components. As exothermic electrical components other than the exothermic semiconductor element, there are L1 of a DC reactor 52 and a high-frequency transformer 55, which are arranged in the second air duct 9 as shown in FIG.

Two connection lines from the solar cell PV to the breaker 22 are wired through two DC wiring introduction pipes 27 formed of an insulating material that is attached through the lower wall 3B of the main body 3, respectively. In addition, the three connection lines from the breaker 23 to the commercial power system (GRID) 63 are respectively connected to the inside of the three AC wiring introduction pipes 28 formed by an insulating material that is attached through the lower wall 3B of the main body 3. Routed through.

As shown in FIGS. 6 and 7, air inlets 12 are respectively formed in the middle part or the lower part of the left wall 3C and the right wall 3D of the main body 3, and the first air duct 8 is formed on the lower wall 3B of the main body 3. An air discharge port 13 is formed at a position corresponding to the lower end opening and the lower end opening of the second air duct 9. The air discharge port 13 is an insect- and dust-proof net 13 detachably attached to the lower wall 3B of the main body 3 from the outside with screws.
Covered with F.

An air intake cover 14 is detachably attached to the outer surfaces of the left wall 3C and the right wall 3D from the outside of the housing 2 with screws 17 in a state of covering the left and right air inlets 12, respectively. The air intake cover 14 is formed with an air introduction port 15 communicating with the air inlet 12 facing downward, and the air introduction port 15 is provided with a dustproof filter 15F for preventing intrusion of insects and dust. . The dust filter 15 </ b> F may be configured to attach a porous filter to the air inlet 15, but may be configured to directly drill a large number of small holes in the lower wall of the air intake cover 14.

As shown in FIG. 6 and FIG. 7, rainproofing is performed so that rainwater entering from the air inlet 15 does not easily reach the air inlet 12 at a position intermediate between the air inlet 12 and the air inlet 15. Barrier 16
Is provided. The rain barrier 16 extends substantially from the left wall 3C and the right wall 3D of the main body 3 to the vicinity of the side wall of the air intake cover 14 while inclining from the left wall 3C and the right wall 3D toward the air inlet 15 respectively. Put out. For this reason, rainwater blown from the air inlet 15 is prevented from entering the housing 2 from the air inlet 12 by the rainproof barrier 16, but outside air is difficult to enter the housing 2 and the air intake cover 14. Since it flows from the gap with the side wall of the housing 2
The outside air can be taken in well.

The rain barrier 16 has a length substantially extending over the front and rear walls of the air intake cover 14 and is inclined toward the air inlet 15 from the side wall of the air intake cover 14 while the left wall 3C and the right wall 3D of the main body 3 are inclined.
It can also be a form extending to the vicinity.

As described above, the rain barrier 16 provided at the intermediate portion between the air inlet 12 and the air inlet 15 causes rainwater to be blown from the air inlet 15 from the air inlet 12 through the rain barrier 16. Although it is difficult to enter the body 2, the outside air flows from the gap between the tip of the rain barrier 16 and the side wall of the air intake cover 14. It is possible to effectively dissipate parts and to ensure stable operation of the power conversion circuit INV.

The rainwater that has entered from the air inlet 15 due to the wind being involved in the strong wind is caused to enter the air inlet 12.
In order to prevent rainwater from entering the electrical components in the housing 2 even if it has entered the housing 2 through the, as shown in FIG. 6 and the like, the left wall 3C and the right wall 3D of the main body 3 are An inner rain barrier 31 arranged in parallel with the left wall 3C and the right wall 3D is provided at a position facing the air inlet 12 on the inner side.

The inner rain barrier 31 extends in the front-rear direction in parallel with the left wall 3C and the right wall 3D of the main body 3, and forms an air passage between the upper and lower ends 31A, 31B and the upper wall 3A and the lower wall 3B of the main body 3. In this state, the rear end base end is attached to the mounting plate 26 with screws. The inner rain barrier 31 is screwed at the tip to the chassis 25 so as to form left and right support legs of the chassis 25.

With this configuration, rainwater entering the housing 2 through the air inlet 12 is prevented from flowing into the inner rain barrier 31.
Therefore, it is possible to prevent the electric component arranged on the inner side from being applied to the power conversion circuit INV and to ensure a stable operation of the power conversion circuit INV. In addition, the outside air flowing in from the left and right air inlets 12 by the operation of the first fan 10 and the second fan 11 is the air between the left and right inner rain barriers 31 and the left wall 3C and the right wall 3D of the main body 3. From the passage, upper and lower ends 31A, 31B of the inner rain barrier 31 and the upper wall 3 of the main body 3
A flows into the housing 2 through the air passage between A and the lower wall 3B, and the entire air in the housing 2 is the first
The air flows toward the air duct 8 and the second air duct 9, flows in from the upper end openings of the first air duct 8 and the second air duct 9, flows downward, flows out of the lower end opening, and exits the housing 2 from the air discharge port 13. Exhausted.

For this reason, the heat generating parts in the first air duct 8 and the second air duct 9 are actively cooled,
Since the air around the outside of the first air duct 8 and the second air duct 9 also forcibly flows, the electrical components arranged around the outside of the first air duct 8 and the second air duct 9 are also cooled, and the power conversion circuit INV is Normal operation can be maintained. In addition, each air duct 8 provided in the main body 3,
The heat dissipating fans 10 and 11 are attached to the upper end openings of the heat dissipating members 9, respectively, so that heat dissipation of the heat-generating electrical components in the air ducts 8 and 9 can be effectively performed while suppressing the temperature rise of the heat dissipating fans. The power conversion device can secure stable operation of the power conversion circuit INV and can achieve low maintenance costs.

As described above, the inner rain barrier 31 has the functions of the left and right support legs of the chassis 25 and the rain barrier, and the outside air flowing in from the air inlet 12 is the inner rain barrier 31 and the left wall of the main body 3. The air passage between 3C and the right wall 3D has a function of forming an outside air inflow passage that flows along the inner rain barrier 31.

Although sunlight is taken up as renewable energy, wind energy, wave motion, and other natural energy can be applied to the present invention.

DESCRIPTION OF SYMBOLS 1 ... Power converter device 2 ... Housing 3 ... Body 4 ... Door 5 ... Hinge 6 ... Annular flange 7 ... Heat sink 7A ... Heat sink substrate 7B ... Heat sink fin 8 ... First air duct 9 ... Second air duct 10 ... First fan 11 ... ... Second fan 12 ... Air inlet 13 ... Air outlet 14 ... Air intake cover 15 ... Air inlet 15F ... Dust filter 16 ... Rain barrier 17 ··· Screw 20A, 20B ··· Cover plate 21 ··· Display 22 · · · Breaker that also serves as a terminal block for wiring 23 · · · Breaker that also serves as a terminal block for wiring 25 ... Chassis 26 ... Placement plate 27 ... DC wiring lead-in pipe 2 .... AC wiring introduction pipe 30 ... Ring seal 50 ... DC noise filter 51 ... Capacitor 52 ... DC reactor 53 ... DC / AC conversion switching circuit 54... Booster 55... High-frequency transformer 56... Rectifier circuit 57 ... Three-phase AC conversion switching circuit 58 ... AC reactor 59 ... Capacitor circuit 60・ ・ ・ Three-phase AC conversion circuit 61 ・ ・ ・ ・ Low-pass filter 62 ・ ・ ・ ・ Relay contact 63 ・ ・ ・ ・ Commercial power system 64 ・ ・ ・ ・ Control circuit K ・ ・ ・ Building PV ・ ・ ・Solar cell INV ... Power conversion circuit

Claims (3)

A main body of a front opening surrounded by upper and lower walls, left and right walls, and a back wall; and a door that is attached to one side of the front opening of the main body so as to be freely opened and closed, and closes a periphery of the front opening via a packing, A casing in which the back wall of the main body is vertically arranged along the wall of the gantry or building, and power that converts DC power obtained from renewable energy stored in the casing into AC power that can be superimposed on the system In a power conversion device comprising an electrical component constituting a conversion circuit and a heat dissipation fan for the electrical component,
The main body includes left and right air inlets formed near or at the lower side of the left and right walls and an air outlet formed on the lower wall,
An air inlet that communicates with the air inlet is formed facing downward, and the air inlet has a filter, and is attached to and detached from the outer surface of the left and right walls from outside while covering the left and right air inlets. Air intake cover that can be attached freely,
By operating the heat dissipating fan, outside air flowing in from the left and right air inlets forms a flow of air that is exhausted from the air outlet to the outside of the housing while promoting heat dissipation of the electrical components. A power conversion device. Among the electrical components, a heat sink in which a heat-generating semiconductor element is attached to the substrate portion in a heat conductive state, and a heat sink fin of the heat sink is accommodated, and an upper end opening is an air inlet, a lower end opening is an air outlet, and the heat dissipating fin is in a vertical direction. The power converter according to claim 1, wherein an air duct having the heat radiating fan attached to the upper end opening is provided in the main body so as to form a flowing air flow. The air intake cover is located at a position intermediate between the air inlet and the air inlet.
3. The power conversion according to claim 1, further comprising a rain barrier that extends from a left wall and a right wall of the main body toward a side of the air intake cover while being inclined toward the air inlet. apparatus.

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