JP4360123B2 - Power converter - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a power conversion apparatus that houses a semiconductor module for power conversion and its accessories as a unit in a housing such as a control panel, and more particularly to improvement of the cooling configuration.
[0002]
[Prior art]
Power processing devices such as laser processing and power converters such as inverter devices, AC power input circuit breakers, suppression of peak currents, AC reactors to prevent adverse effects of power supply distortion on other connected devices, main circuit electromagnetic switching , A diode module for rectifying AC power into DC power, an electrolytic capacitor for smoothing pulsations contained in the DC power, an IGBT for converting the smoothed DC power into AC power having a desired voltage and frequency, etc. The semiconductor module, the diode module, a heat sink and a cooling fan for cooling the semiconductor module, various control printed boards, and an input / output terminal block are included.
[0003]
The above-mentioned conventional power converter is composed of a semiconductor module, cooling fins, main circuit block including smoothing capacitors, printed circuit board block, cooling fan block, terminal block block, box block, etc. So that different protection structures can be easily configured. The cooling fan block is disposed in the upper part of the apparatus, cools the smoothing capacitor disposed in the lowermost stage by the induced draft, then cools the cooling fin, and then exhausts from the uppermost part (see, for example, Patent Document 1). ).
[0004]
[Patent Document 1]
JP 2000-232288 (paragraph [0012], FIG. 1)
[0005]
In addition, a radiating fin is disposed opposite to the rear side wall of the control box that houses the electronic device provided with the heating element, and outside air is blown from the lower surface of the radiating fin by a cooling fan, and from the exhaust port above the radiating fin. The air guide plate exhausts upward along the rear side wall of the control box (see, for example, Patent Document 2).
[0006]
[Patent Document 2]
Utility Model Registration No. 2508697 (paragraph [0006], FIG. 1)
[0007]
[Problems to be solved by the invention]
For example, since the device described in Patent Document 1 is sucked from the lower surface of the apparatus and exhausted from the upper surface, when stored in the control panel casing, other compartments or devices cannot be closely attached to the upper stage, and the upper stage is exhausted. Space is required, and the housing needs to be enlarged. In addition, the leeward temperature of the radiating fins increases the temperature on the leeward side and cooling is impaired. For this reason, there has been a problem that a large radiating fin is required.
[0008]
For example, although the thing of the said patent document 2 is blowing the external air from the lower surface of a radiation fin, although the cooling efficiency is improved, in the radiation fin which is 2 to 3 times or more compared with the size of a cooling fan Similarly, the leeward side is easily heated by the heat release from the leeward side. Moreover, since the upper surface of the exhaust port is not covered, the protection structure is inferior, such as lack of drip-proof performance, and there is a problem that it cannot be installed depending on the factory environment.
[0009]
In addition, since the two conventional devices have the devices arranged in a plane, the width of the apparatus is large, and accordingly, the width of the control panel housing for housing them is also large. In addition, other devices cannot be placed in front of the power conversion device for maintenance and inspection of the device, and devices such as an input circuit breaker, an AC reactor, and a main circuit electromagnetic switch, which are incidental devices in the power conversion device, are installed. A separate space is required for storage.
[0010]
The present invention has been made to solve the above-described problems, and can efficiently cool the heat generated from the semiconductor module and the like, and can be in close contact with other equipment or compartments on the upper surface. It aims at obtaining the power converter device which can make a body small.
[0011]
It is another object of the present invention to provide a power conversion device that is excellent in environmental friendliness because it can be compactly constructed by compulsorily air-cooling ancillary equipment in the power conversion device, reducing the manufacturing cost of the entire control panel.
[0012]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a power converter including a heat sink to which a semiconductor module is attached and a cooling fan that cools the heat sink. The power converter includes the semiconductor module, the heat sink, and a cooling device. A housing that houses a fan and has an exhaust port at the upper back and an intake port in the middle of the back, and a rear side that includes a dust-proof compartment in front of the housing and the exhaust port and intake port. A first partition plate that divides so as to form a ventilation compartment; a second partition that forms an air intake compartment so as to surround the air intake port in the ventilation compartment and has a fan hole at a position corresponding to the cooling fan ; A unit front portion in which the electronic device including the semiconductor module of the power conversion device is disposed and housed in the dustproof compartment, The rear portion of the unit where the heat sink and the cooling fan of the power conversion device are arranged passes through the opening formed in the first partition plate and is placed and stored in the ventilation compartment, and the intake side of the cooling fan In close contact with the fan hole formed in the second partition plate, and the outside air sucked from the outside of the housing through the intake port reaches the inside of the intake compartment and passes through the fan hole from the discharge side of the cooling fan into the heat sink. It is the structure which exhausts from the exhaust port provided in the upper part of the housing | casing back surface where the said inlet port is provided .
[0013]
The power converter according to claim 2 of the present invention is characterized in that the intake port is provided below the position of the cooling fan and the exhaust port is provided above the position of the cooling fan .
[0014]
According to a third aspect of the present invention, there is provided the power conversion device according to the third aspect, wherein the cooling fan is disposed substantially at the center of the back surface of the heat sink, the outside air flowing through the heat sink is exhausted from the upper and lower sides of the heat sink, It is provided at the top and bottom of the intake section, and is configured to discharge from the upper and lower exhaust ports to the outside of the housing.
[0015]
According to a fourth aspect of the present invention, there is provided a power conversion device according to a fourth aspect of the present invention, wherein the heat dissipating fins of the heat sink are vertically divided into two parts, and an electrolytic capacitor passes between the upper and lower heat dissipating fins from the front part of the unit to the rear part of the unit. It is characterized by being arranged.
[0016]
The power conversion device according to claim 5 of the present invention is characterized in that a heating element such as a reactor, a transformer, a resistor or the like is disposed on the exhaust side of the heat sink and is forcedly cooled by exhaust from the heat sink. To do.
[0017]
A power converter according to a sixth aspect of the present invention is a reactor or a transformer in which a heating element includes a winding and an iron core, and is fixedly attached to a rear part of the unit via an attachment member fixed to the iron core. A terminal portion is disposed at the front side of the unit on the front side of the mounting member, and a lead drawn from the winding is connected to the terminal portion through the mounting member. To do.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
Hereinafter, the configuration of the power conversion apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 is a longitudinal sectional view of a power conversion device housed in a control panel, FIG. 2 is a front view of a rear portion of the unit of the power conversion device, and FIG. 3 is a transverse sectional view of an upper heat sink portion of the power conversion device shown in FIG. 4 is a cross-sectional view of the lower part of the power converter shown in FIG. 2, FIG. 5 is a vertical cross-sectional view of the power converter shown in FIG. 1 pulled out halfway, and FIG. 6 is a view of the control panel after the power converter is pulled out. It is a principal part front view.
[0019]
In the figure, reference numeral 1 denotes a bottom plate of the control panel 100. Beams 2 are disposed before and after the bottom plate 1, and casters 3 are attached. Reference numeral 4 denotes a horizontal partition plate disposed in the middle of the control panel 100. 5 is a door disposed on the front surface, and 6 is a back plate disposed on the back surface. Reference numeral 7 denotes a first partition plate disposed between the door 5 and the back plate 6. The space between the bottom plate 1 and the horizontal partition plate 4 is divided forward and backward by the first partition plate 7. A dust-proof section 101 is formed in the front and a ventilation section 102 is formed in the rear. Further, another partition 104 is formed on the upper part of the horizontal partition plate 4 and is closed by another door or the like.
[0020]
An upper exhaust port 6 </ b> A is formed in the upper portion of the back plate 6, and an upper louver 11 having a large number of blades 10 is disposed on the inner side thereof. The bottom plate 1 located in the ventilation compartment 102 is provided with a lower exhaust port 1A made of a slit hole. In addition, an intake port 6B larger than the upper exhaust port 6A is formed in an intermediate portion of the back plate 6, and a middle louver 12 having a large number of blades 10 is also disposed. In the ventilation section 102, the second partition plate 8 forms an intake section 103 that surrounds the intake port 6 </ b> B.
[0021]
The vertical portion 8A of the second partition plate 8 is provided with a fan hole 8D that is in close contact with a cooling fan 39 described later, and the upper horizontal portion 8B extends from the upper end of the vertical portion 8A until it reaches the outer frame of the upper louver 11. It is installed. Further, a lower inclined portion 8C extending obliquely from the lower end of the vertical portion 8A to the back plate 6 is provided. The middle louver 12 for intake is disposed below the intake section 103 so as to be away from the upper louver 11.
[0022]
In FIG. 6, 9 is an intermediate side wall, the door 5 and the back plate 6 are in close contact with the front and rear surfaces of the left and right intermediate side walls 9, respectively, and the left and right ends of the first partition plate 7 and the second partition plate 8 are the intermediate side walls. 9 is fixed to the side wall surface 9A. Further, the widths of the upper louver 11 and the middle louver 12 are also configured to the full width of the intermediate side walls 9, 9. A plurality of dustproof compartments 101, ventilation compartments 102 and intake compartments 103 formed as described above are formed side by side in the control panel 100 as necessary.
[0023]
Next, the configuration of the power converter 105 will be described. The casing of the power converter 105 includes a left side plate 51, a right side plate 52, and left and right side plates 51, 52 that are connected to each other at the rear and front in a back plate 53 and a front plate 54. A unit front portion 106 located on the front side of the back plate 53 and a unit rear portion 107 located on the back side are configured. The unit front portion 106 is accommodated in the dustproof compartment 101 and the unit rear portion 107 is located in the ventilation compartment 102. Storage arrangement.
[0024]
As components housed in the front portion 106 of the unit, 24 is an AC power supply input breaker, 25 is a protective breaker for the control circuit, and 26 is a control board, which is attached to the front side of the front plate 54. A control board 27 and the like are also attached to the back side of the front plate 54. A display substrate 29 is attached to the front side of the control substrate 26 via an auxiliary plate 55. Reference numeral 28 denotes a control circuit connector mounted on a lower portion of the control board 26, and a control cable (not shown) is wired from the outside. Reference numeral 43 denotes a main circuit terminal block, which is disposed below the front plate 54, and is connected to an AC power source input cable and a power converted output cable (both not shown).
[0025]
Reference numerals 30 and 31 denote main circuit electromagnetic switches, which are attached to a side plate 56 disposed in the opening 52A of the right side plate 52, respectively. A diode module 32 rectifies AC power into DC power. 33 is an electrolytic capacitor for smoothing the pulsation contained in the DC power, and two capacitors are arranged side by side. Reference numeral 34 denotes a semiconductor module such as an IGBT for converting the smoothed DC power into AC power having a desired voltage and frequency. Reference numeral 35 denotes a gate control substrate for the semiconductor module 34.
[0026]
As components housed in the unit rear portion 107, 36 is an upper heat sink, and 37 is a lower heat sink. The upper heat sink 36 is fixed so as to close a square hole 53A formed in the back plate 53 with the base plate 36A, and the heat radiating fins 36B are arranged in the ventilation section 102. Two of the diode module 32 and the plurality of semiconductor modules 34 are fixed to the upper heat sink 36 and disposed in the dustproof compartment 101. The electrolytic capacitor 33 has a terminal portion 33 </ b> A disposed in the dustproof compartment 101 and a main body portion disposed in the ventilation compartment 102 through a round hole 53 </ b> B formed in the back plate 53. The diode module 32 and the semiconductor module 34 are connected and fixed in parallel by the conductor 40 and by the conductor 41.
[0027]
Similarly to the upper heat sink 36, the lower heat sink 37 disposed below the electrolytic capacitor 33 is also fixed so as to close the square hole 53C, and another semiconductor module 34 is fixed. A device 38 having a winding and an iron core is disposed below the lower heat sink 37. The device 38 is used as an AC reactor for suppressing peak current and preventing adverse effects of power supply distortion on other connected devices and a high-frequency transformer for stepping up or stepping down the output voltage after power conversion. Note that the base plates of the upper and lower heat sinks 36 and 37 may be formed integrally, and only the radiation fins may be divided vertically.
[0028]
As shown in FIG. 4, the device 38 having a winding and an iron core has an attachment member 38C fixed to an iron core 38B passing through the inside of the winding 38A by a steel band or the like. The attachment member 38C is fixed so as to close the square hole 53D of the back plate 53, and the winding 38A and the iron core 38B are disposed in the ventilation section 102. Further, a terminal block 38D is attached to the front side of the attachment member 38C so as to be located in the dust-proof section 101. The lead 38E coming out of the winding 38A passes through the attachment member 38C and is connected to the terminal block 38D.
[0029]
Reference numeral 57 denotes a fin cover that covers the upper and lower heat sinks 36 and 37 and the rear part of the main body of the electrolytic capacitor 33. The fin cover 57 has a U-shaped horizontal cross section, is fixed to the left and right side plates 51 and 52 by screws, and a cooling fan 39 is attached to the back thereof. One or two cooling fans 39 are arranged substantially at the center of the electrolytic capacitor 33. The fan hole 57A formed in the fin cover 57 is concentric with the fan hole 8D of the second partition plate 8 disposed on the rear side.
[0030]
The power converter 105 is suspended and held so that the upper ends of the side plates 51 and 52 are hooked on the guide rail mechanism 109. The horizontal frame 60 that connects the side plates 51 and 52 in front of the upper end is used as an assembly or handle of a lock mechanism with the guide rail mechanism 109. The unit rear portion 107 of the power converter 105 incorporated in the control panel 100 is located in the ventilation compartment 102 through the opening 7A (FIG. 6) drilled in the first partition plate 7. A packing 58 is disposed so as to contact the periphery of the opening 7A, and the sealing performance with the ventilation compartment 102 is improved.
[0031]
The power conversion device 105 configured as described above can be pulled out along a pair of left and right guide rail mechanisms 109 as shown in FIG. The guide rail mechanism 109 is fixed to the lower surface of the horizontal partition plate 4 and extends through the first partition plate 7 into the ventilation compartment 102. Reference numeral 14 denotes a rail cover for partitioning the rear portion of the guide rail mechanism 109 from the ventilation section 102. The rail cover 14 ensures the dustproof property of the rear portion of the guide rail mechanism 109.
[0032]
The vertically-configured power conversion device 105 can normally store two to three units between the left and right intermediate side walls 9 and 9 in a laterally adjacent manner. A one-dot chain line 90 in the figure indicates a boundary line of the power conversion devices 105 arranged side by side. That is, the dust-proof section 101, the ventilation section 102, and the intake section 103 are formed in common for a plurality of power converters 105.
[0033]
Next, the operation will be described. By the operation of the cooling fan 39, the outside air intake flow indicated by the arrow 91 passes through the middle louver 12 and is sucked into the intake section 103. Next, the air flows through the fan holes 8 </ b> D and 57 </ b> A and is pushed into the fin cover 57 to be divided into an upper outside air flow 92 and a lower outside air flow 93. The upper outside air flow 92 flows through the heat dissipating fins 36B of the upper heat sink 36, is deflected substantially perpendicularly rearward from the upper end portion of the fin cover 57, and passes through the upper louver 11 as the upper exhaust air flow indicated by the arrow 92A outside the control panel. Exhausted.
[0034]
The lower outside airflow 93 flows through the heat dissipating fins of the lower heat sink 37 and is pushed out from the lower end. Next, the airflow in the central part collides with the device 38 having the winding and the iron core, and detours as shown by an arrow 93A (FIG. 4). Next, the air is exhausted out of the control panel from the slit hole 1A of the bottom plate 1 as a lower exhaust airflow indicated by an arrow 93B.
[0035]
The electrical characteristics and life of the electrolytic capacitor 33 have a large temperature dependence. Therefore, it is necessary to use at a low ambient temperature in order to obtain good electrical characteristics and a long life. According to the above configuration, the outside air blown from the cooling fan 39 directly collides with the main body of the electrolytic capacitor 33. The outside air has the lowest temperature because there is no object to be cooled on the windward side, and is a high-speed turbulent flow, so that the electrolytic capacitor 33 is cooled well.
[0036]
Since the cooling fan 39 is disposed so as to oppose the fin longitudinal direction of the upper heat sink 36 and the lower heat sink 37, the outside air is substantially perpendicular to the surface of the heat radiating fins of the heat sinks 36, 37 (approximately perpendicular to the base plate). The air is blown and the outside air reaches the depth of the heat radiation fins at a narrow interval at high speed, and the vicinity of the base plate that is at the highest temperature is cooled by the collision jet, so that heat transfer is improved. Further, since there are many portions facing the cooling fan 39, a large temperature difference between the heat radiating fins and the outside air can be obtained in most of the heat radiating fins, and the heat radiation amount can be increased.
[0037]
According to the above configuration, the upper heat sink 36 and the lower heat sink 37 are divided with respect to the size of the heat sink required by the power conversion device 105, so that both can be shortened. In addition, since the outside airflow flows from the divided portions of the upper and lower heat sinks 36 and 37 to the opposite sides, the fin pressure loss is greatly reduced and the cooling airflow speed does not decrease. Moreover, the trouble that the leeward side is heated by the heat dissipation on the leeward side can be almost solved. Thereby, coupled with the improvement of the heat transfer performance by the impact jet effect, the heat sink 36 and the lower heat sink 37 achieve a remarkable heat dissipation performance, and the diode module 32 and the semiconductor module 34 are cooled well.
[0038]
The device 38 including the winding and the iron core is forcibly cooled by a high-speed air flow 93A that flows out from the lower end portion of the lower heat sink 37 and flows therearound. Therefore, it can be made smaller and lighter than those normally used for natural cooling. And since the terminal part which is a charging part can be arrange | positioned in the dust-proof division 101, environmental resistance can be improved. Further, since it is arranged below the lower heat sink 37 shorter than the upper heat sink 36, a balance of air path resistance between the upper outside air flow 92 and the lower outside air flow 93 is obtained, and the upper and lower cooling fans 39 are mutually connected. Static pressure loss due to interference can be minimized.
[0039]
According to this configuration, the upper exhaust air flow 92 </ b> A is exhausted from the upper exhaust port 6 </ b> A on the back of the control panel 100. The control section 100 can be downsized as a whole. On the other hand, the exhaust airflow coming out of the upper heat sink 36 flows in the vicinity of the cooling fan 39, so that a problem of backward flow to the intake side of the cooling fan 39 is likely to occur. However, since the intake surface of the cooling fan 39 is in close contact with the second partition plate 8, the above-described problem is avoided.
[0040]
An intake port 6B for forcibly cooling the unit rear portion 107 with outside air is provided on the back surface of the control panel 100. Compared to the case where the air inlet is provided on the bottom surface of the power conversion device 105, since much dust is not sucked into the floor surface, there is less concern about the clogging of the fins, and the insulation reliability of the device 38 equipped with the winding and the iron core Also improves. On the other hand, when the upper exhaust port 6A and the intake port 6B approach each other, an air current short-circuit defect in which the upper exhaust air flow 92A is directly sucked into the intake port 6B is likely to occur. In particular, when the louvers 11 and 12 are provided in order to prevent water droplets from entering from the upper exhaust port 6A and the intake port 6B, the upper exhaust air flow 92A is deflected downward, so that the above problem is more likely to occur. However, since the intake port 6 is disposed in the intake section 103 and is disposed below the position of the cooling fan 39, the above-described problem can be avoided. Further, the intake section 103 alleviates the rectification of the intake airflow entering from the middle louver 12 and the sudden bending of the airflow to the cooling fan 39.
[0041]
A heat exchanger 108 for indirectly cooling the inside of the dustproof compartment 101 is attached to the door 5. The heat exchanger 108 includes an inside air fan 21, a heat transfer plate 22, and an outside air fan 23. By the operation of the inside air fan 21, high-temperature air (inside air) in the dust-proof section 101 is sent from the upper part of the heat transfer plate 22, and the arrow As indicated by 94, it is returned to the lower part of the dustproof compartment 101. Since the bottom surface and the top surface of the power conversion device 105 are released, the internal airflow indicated by the arrow 94 is distributed almost uniformly in the power conversion device 105, and accelerates upward natural convection.
[0042]
On the other hand, the outside air is sent from the lower part of the heat transfer plate 22 by the operation of the outside air fan 23 and is exhausted outside the control panel as indicated by an arrow 95. The inside of the dust-proof section 101 is indirectly cooled by the heat exchange action in the heat transfer plate 22 described above, and each electric device in the unit front portion 106 is cooled well.
[0043]
Reference Example 1
Hereinafter, with reference to FIG. 7, the structure of the power converter device which concerns on the reference example 1 of this invention is demonstrated. FIG. 7 is a longitudinal sectional view corresponding to FIG. In the figure, 6A is an upper exhaust port composed of a slit hole drilled in the upper portion of the back plate 6, and 6C is a lower exhaust port composed of a slit hole drilled in the lower portion of the back plate 6. The back plate 6 is not provided with an intake port, and the bottom plate 1 is not provided with an exhaust port. Reference numeral 81 denotes a duct having a rectangular cross section serving as a second partition plate. The left and right ends of the duct are closely fixed to the side wall surface 9A, and an intake section 103 is formed therein. A vertical hole 81A of the duct 81 is provided with a fan hole 81B that is in close contact with the cooling fan 39. The upper exhaust port 6A and the lower exhaust port 6C can be expanded to a position overlapping the duct 81 in the vertical direction.
[0044]
A side air inlet 9B made up of a large number of slit holes is formed in the side wall surface 9A located in the air intake section 103. When the side wall surface 9 </ b> A is positioned on the outer surface of the control panel 100, air can be sucked from the side surface of the control panel 100 as it is. When the side wall surface 9A is located in the middle of the control panel 100, the side intake ports 9B are provided on both the left and right sides, and intake can be performed via the side intake ports 9B located on the outer side. If the cross section of the duct 81 is increased, the opening area of the side air inlet 9B can be increased, so that sufficient intake air can be obtained. Alternatively, the intermediate side wall 9 may be formed as a double partition wall, and an air inlet may be formed in the bottom plate 1 positioned within the width of the double partition wall. Since other parts are configured in the same manner as in the first embodiment, description thereof is omitted.
[0045]
By the operation of the cooling fan 39, the outside air is sucked into the intake section 103 from the side intake port 9B as indicated by an arrow 91. Next, as in the first embodiment, the upper heat sink 36, the lower heat sink 37, and the device 38 including the windings and the iron core are cooled by diverting up and down, and exhaust air flows 92A and 93B are formed from the back of the control panel 100 to the outside of the panel. Exhausted. According to this configuration, the air inlet and the air outlet are greatly separated from each other, and since the air outlet can be extended over the entire back plate, there is no airflow short-circuit problem even if the building wall surface is close to the back of the control panel 100, Since the exhaust can be sufficiently performed, the rear surface of the control panel 100 and the wall surface of the building can be installed close to each other, and the installation area can be reduced.
[0046]
【The invention's effect】
The power conversion device according to the present invention forms a dust-proof section in which an electronic device including a semiconductor module is disposed in the front, forms a ventilation section in which a heat sink and a cooling fan are disposed in the rear, and has an intake port in the ventilation section. Since the outside air that has been formed from the back of the control panel housing reaches the inside of the air intake compartment, flows through the heat sink from the discharge side of the cooling fan, and is exhausted from the exhaust port on the back of the housing. It is possible to obtain a power conversion device that is excellent in performance, and that can be in close contact with other devices or other sections on the upper surface, and that can downsize the control panel casing. In addition, a short circuit between the intake and exhaust airflows can be prevented, and flexibility in the arrangement of the intake ports can be obtained.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a power conversion device housed in a control panel according to Embodiment 1 of the present invention.
FIG. 2 is a front view of a unit rear portion of the power conversion device according to the first embodiment of the present invention.
3 is a cross-sectional view of an upper heat sink portion in FIG.
4 is a cross-sectional view of the lower part in FIG. 2. FIG.
5 is a longitudinal sectional view in which the power conversion device is pulled out partway in FIG. 1. FIG.
FIG. 6 is a front view of essential parts of the control panel after the power conversion device according to the first embodiment of the present invention is pulled out.
FIG. 7 is a longitudinal sectional view of a power conversion device housed in a control panel according to Reference Example 1 of the present invention.

Claims (6)

In a power converter comprising a heat sink to which a semiconductor module is attached and a cooling fan for cooling the heat sink,
The exhaust with the power converter, a housing of the semiconductor module and the heat sink and the cooling fan to the housing outlet to the top rear provided an inlet on the rear intermediate portion, to form a dust-proof compartment in front of the housing A first partition plate that is divided so as to form a ventilation compartment on the rear side including a rear surface provided with a mouth and an air inlet; and an air intake compartment that surrounds the air inlet in the ventilation compartment and the cooling fan A second partition plate provided with a fan hole at a position corresponding to
A unit front portion in which the electronic device including the semiconductor module of the power conversion device is disposed is housed in the dustproof compartment, and a unit rear portion in which the heat sink and the cooling fan of the power conversion device are disposed is the first portion. 1 through the opening formed in the partition plate and placed and accommodated in the ventilation compartment,
The intake side of the cooling fan is brought into close contact with the fan hole formed in the second partition plate, and the outside air that has been sucked in from the outside of the housing through the intake port reaches the intake compartment and passes through the fan hole. A power conversion device characterized in that the air flow is exhausted from an exhaust port provided in an upper part of a rear surface of the housing provided with the intake port through the inside of the heat sink from the discharge side. The power converter according to claim 1, wherein the intake port is provided below the position of the cooling fan, and the exhaust port is provided above the position of the cooling fan. A cooling fan is placed in the center of the back of the heat sink, the outside air flowing through the heat sink is exhausted from the top and bottom of the heat sink, and the exhaust on the back of the housing is provided above and below the intake compartment. The power converter according to claim 1, wherein the power converter is configured to be discharged outside the body. The heat radiation fins of the heat sink are divided into two parts vertically and an electrolytic capacitor is disposed between the upper and lower heat radiation fins so as to penetrate from the front part of the unit to the rear part of the unit. 4. The power conversion device according to any one of 3. The electric power according to any one of claims 1 to 4, wherein a heating element such as a reactor, a transformer, and a resistor is disposed on an exhaust side of the heat sink, and is forcedly cooled by exhaust from the heat sink. Conversion device. The heating element is a reactor or a transformer having a winding and an iron core, and is fixedly attached to the rear part of the unit via an attachment member fixed to the iron core. 6. The power conversion device according to claim 5, wherein a terminal portion is disposed and a lead drawn from the winding passes through the attachment member and is connected to the terminal portion.

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