Power conversion device

Abstract

The partition member (150) is arranged in a gap portion between the back surface of the frame (110) and the outer surfaces of the plurality of units (20, 30). The first partition portion (150A) is arranged in a boundary portion of two units adjacent in the up-down direction, extending in the left-right direction. The second and third partition portions (150B, 150C) are respectively connected to both end portions of the first partition portion (150A) in the left-right direction, extending toward the upper surface (110A). Air discharged from a first group of units located at a position higher than the first partition portion (150A) flows in a first air passage and is guided to the upper surface (110A). Air discharged from a second group of units located at a position lower than the first partition portion (150A) flows in a second air passage and is guided to the upper surface (110A). The first fan unit (120) is located at a downstream end of the first air passage, and the second and third fan units (122, 124) are located at downstream ends of the second air passages.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a power conversion device. BACKGROUND

[0002] There is a power conversion device in which a plurality of units are housed in a frame body having a rectangular parallelepiped shape in a stacked manner in the up-down direction. This power conversion device is generally configured to cool the plurality of units by circulating cooling air in the frame body. In this power conversion device, an air duct for circulating air is provided on the back surface side of the plurality of units, and air that has cooled each unit is discharged to the outside of the frame body through the air duct. However, in the above-described structure, there is a problem in that the amount of air ventilation becomes unbalanced due to the housing positions of the units, and the cooling performance is reduced in units in which the amount of ventilation is small.

[0003] As a means for solving this problem, for example, in Japanese Patent Application Publication No. 2007-74865 (Patent Literature 1), a power conversion device is disclosed, which is configured to house a plurality of semiconductor conversion units in a frame body in two rows of left and right, and to circulate cooling air in the frame body to perform air cooling on each semiconductor conversion unit. In Patent Literature 1, on the back surface of the plurality of semiconductor conversion units divided into two rows of left and right, a longitudinal air duct extending in the up-down direction is provided corresponding to each row. On the ceiling of the frame body, two cooling fans are provided corresponding to each air duct, respectively.

[0004] In addition, in Japanese Patent Application Publication No. 2016-115894 (Patent Literature 2), a frame body configuration of a power conversion device in which a plurality of semiconductor units are stacked in multiple layers is disclosed. In this frame body configuration, the plurality of semiconductor units are divided into a first group consisting of odd-numbered semiconductor units from the uppermost layer and a second group consisting of even-numbered semiconductor units from the uppermost layer. In order to pass cooling air through each semiconductor unit, a first air duct and a second air duct are provided corresponding to the first group and the second group, respectively. The first air duct and the second air duct are arranged in the left-right direction of the frame body on the back surface side of the frame body.

[0005] PRIOR ART DOCUMENTS

[0006] PATENT LITERATURE

[0007] Patent Literature 1: Japanese Patent Application Publication No. 2007-74865

[0008] Patent Literature 2: Japanese Patent Application Publication No. 2016-115894 SUMMARY

[0009] PROBLEMS TO BE SOLVED BY THE INVENTION

[0010] In the power conversion device described in Patent Literature 1, since two air tunnels corresponding to the two rows of semiconductor units are arranged in the left-right direction, the length of the frame in the left-right direction is increased, and as a result, there is a risk of increasing the installation area of the frame.

[0011] In the frame structure described in Patent Literature 2, since the plurality of semiconductor units are stacked in one row, the length of the frame in the left-right direction can be shortened compared to Patent Literature 1. On the other hand, inside each semiconductor unit, cooling air is biased to one of the left or right sides in the direction toward one of the first and second air tunnels. Therefore, there is a risk of reducing the cooling performance of each semiconductor unit.

[0012] The present disclosure was made to solve this problem, and the purpose of the present disclosure is to improve the cooling performance of a plurality of units without increasing the installation area of a frame for a power conversion device having the plurality of units housed in the frame in a stacked manner in the up-down direction.

[0013] Means for solving the problem

[0014] A power conversion device according to an embodiment of the present disclosure includes a frame having a rectangular parallelepiped shape, a plurality of units housed in the frame in a stacked manner in an up-down direction, a plurality of fan units arranged on an upper surface of the frame, and a partition member. The partition member is arranged in a gap portion formed between a back surface of the frame and an outer surface of the plurality of units. Each of the plurality of units has a fan built therein. The fan is configured to take in air into the corresponding unit and discharge the taken-in air toward the gap portion. The partition member includes first to third partition portions. The first partition portion is arranged at a boundary portion of two units adjacent in the up-down direction among the plurality of units and extends in a left-right direction of the frame. The second and third partition portions are connected to both end portions in the left-right direction of the first partition portion, respectively, and extend toward the upper surface of the frame. A gap between an inner surface of the frame and the outer surface of the plurality of units is divided by the partition member, and a first air passage and a second air passage are formed in the gap. Air discharged from a first group of units located at an upper portion than the first partition portion flows in the first air passage and is guided to the upper surface of the frame. Air discharged from a second group of units located at a lower portion than the first partition portion flows in the second air passage and is guided to the upper surface of the frame. The plurality of fan units includes a first fan unit, a second fan unit, and a third fan unit. The first fan unit is arranged at a downstream end of the first air passage. The second and third fan units are arranged at downstream ends of the second air passage.

[0015] Effects of the Invention

[0016] According to the present disclosure, for a power conversion device having a plurality of units housed in a frame in a stacked manner in an up-down direction, the cooling performance of the plurality of units can be improved without increasing the installation area of the frame. Attached Figure Description

[0017] Figure 1 This is a schematic external view showing an example of the configuration of the power conversion device according to the embodiment.

[0018] Figure 2 Viewed from the top surface Figure 1 The diagram shows an uninterruptible power supply device.

[0019] Figure 3 It is a circuit block diagram representing the structure of an uninterruptible power supply device.

[0020] Figure 4 This is a circuit block diagram illustrating an example of the configuration of a UPS unit and a bypass unit.

[0021] Figure 5 This is a rough representation of the view from the rear side. Figure 1 The diagram shows the appearance of the uninterruptible power supply device in its current state.

[0022] Figure 6 Viewed from the back Figure 1 Rear view of the uninterruptible power supply device shown.

[0023] Figure 7 Viewed from the side Figure 1 A side view of the uninterruptible power supply device shown. Detailed Implementation

[0024] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Furthermore, the same or equivalent parts in the drawings will be labeled with the same reference numerals, and their descriptions will generally not be repeated.

[0025] Figure 1 This is a schematic external view showing an example of the configuration of the power conversion device according to the embodiment. Figure 1 The diagram shows the internal structure of the power conversion device with the front cover of the frame removed. This power conversion device, for example, can be applied to uninterruptible power supply (UPS) devices.

[0026] An uninterruptible power supply (UPS) 100 is connected between an AC power source (not shown) such as a commercial power supply and a load (not shown). Under normal conditions (when the AC power supply is normal), the UPS 100 supplies power to the load using AC power supplied from the AC power source. In the event of an AC power outage, the UPS 100 supplies power to the load using DC power supplied from an energy storage device (not shown).

[0027] like Figure 1As shown, the uninterruptible power supply device 100 is provided with a cabinet-shaped (rectangular parallelepiped-shaped) frame 110, a plurality of units 20, 30, and a plurality of fan units 120, 122, 124. In the following description, the left-right direction (horizontal direction) when the frame 110 is viewed from the front side will be referred to as the X-axis direction, the front-rear direction will be referred to as the Y-axis direction, and the up-down direction will be referred to as the Z-axis direction. In addition, the +X direction is a direction in which the X-axis direction is advanced to the right, and the -X direction is a direction opposite to the +X direction. The +Y direction is a direction in which the Y-axis direction is advanced toward the back from the front of the uninterruptible power supply device 100, and the -Y direction is a direction opposite to the +Y direction. The +Z direction is a direction in which the Z-axis direction is advanced upward, and the -Z direction is a direction opposite to the +Z direction.

[0028] The frame 110 has an upper surface 110A and a lower surface 110B. The lower surface 110B of the frame 110 is supported by a pair of leg portions 112. The frame 110 houses the plurality of units 20, 30. The frame 110 has an opening portion 111 that is open to the -Y direction and a front cover (not shown) that covers the opening portion 111. The front cover is configured to be able to open and close the opening portion 111. The front cover is formed with air vents for introducing air from the outside of the frame 110 into the inside of the frame 110.

[0029] The plurality of units 20, 30 have a substantially rectangular parallelepiped shape and are stacked at intervals from each other in the Z-axis direction. The plurality of units 20, 30 are inserted into the inside of the frame 110 from the outside of the frame 110 through the opening portion 111. The plurality of units 20, 30 are each configured to be able to be inserted and pulled out in the Y-axis direction, so that maintenance inspection and replacement of new products become easy.

[0030] The plurality of units 20, 30 include a plurality of UPS (Uninterruptible Power Supply) units 20 and a bypass unit 30. The number of UPS units 20 is not limited to five. The number of bypass units 30 is not limited to one.

[0031] A ventilation hole 21 is formed in the front of the UPS unit 20, and a ventilation hole is formed in the back of the UPS unit 20. The UPS unit 20 is built-in with a fan 22 for sucking air from the front and discharging air from the back. A ventilation hole 31 is formed in the front of the bypass unit 30, and a ventilation hole is formed in the back of the bypass unit 30. The bypass unit 30 is built-in with a fan 32 for sucking air from the front and discharging air from the back. The number of fans built-in in each unit is not limited to two.

[0032] The fan units 120, 122, 124 are arranged on the upper surface 110A of the frame 110. The fan units 120, 122, 124 respectively suck air inside the frame 110 and discharge the sucked air outside the frame 110. Thereby, air introduced into the frame 110 through the ventilation holes of the front cover of the frame 110 is guided through the plurality of units 20, 30, thereby promoting heat dissipation of the plurality of units 20, 30. The air heated by the plurality of units 20, 30 is discharged from the upper surface 110A of the frame 110 to the outside of the frame 110.

[0033] Figure 2 is a view of the uninterruptible power supply device 100 as viewed from the upper surface. Figure 1

[0034] As shown in Figure 2 , on the upper surface 110A, the fan unit 120 is arranged on the back surface side, and the fan units 122, 124 are arranged on the front surface side. The fan units 122, 124 are respectively arranged on both end portions in the left-right direction of the frame 110. The fan unit 122 is arranged on the left side when the frame 110 is viewed from the front surface side, and the fan unit 124 is arranged on the right side when the frame 110 is viewed from the front surface side.

[0035] The fan units 120, 122, 124 respectively have a plurality of fans 130. The plurality of fans 130 are arranged on the upper surface 110A of the frame 110. The fan unit 120 has three fans 130 arranged in the X-axis direction. The fan units 122, 124 respectively have three fans 130 arranged in the Y-axis direction.

[0036] In addition, in the example of Figure 2 , the fan units 120, 122, 124 respectively have three fans 130, but the number of fans 130 can be appropriately changed according to the amount of air supply required for cooling of the plurality of units 20, 30. In addition, the number of fans 130 can be different between the fan units 120, 122, 124.

[0037] Figure 3 is a circuit block diagram showing the configuration of the uninterruptible power supply device 100.

[0038] As shown in Figure 3 , the uninterruptible power supply device 100 includes an input terminal T11, a battery terminal T12, an output terminal T13, a plurality of UPS units 20, and a bypass unit 30. The input terminal T11 is connected to the commercial power source 1 and receives commercial alternating-current power. The output terminal T13 is connected to the load 3. The battery terminal T12 is connected to the battery 2. The battery 2 corresponds to an embodiment of the power storage device. The plurality of UPS units 20 and the bypass unit 30 are connected in parallel between the input terminal T11 and the output terminal T13.​

[0039] Figure 4 is a circuit block diagram showing a configuration example of the UPS unit 20 and the bypass unit 30.

[0040] As shown in Figure 4 , the UPS unit 20 includes input terminals T1, output terminals T3, battery terminals T2, switches S1 to S4, capacitors C1 to C4, reactors L1 to L3, a converter 5, an inverter 6, a bidirectional chopper 7, and a fan 22.

[0041] The terminals T1, T2, T3 are connected to the terminals T11, T12, T13, respectively. The switch S1 and the reactor L1 are connected in series between the input terminal T1 and an input node 5a of the converter 5. The capacitor C1 is connected between a node between the switch S1 and the reactor L1 and a line of a reference voltage. The switch S1 is turned on at normal time and turned off at maintenance time of the UPS unit 20, for example. The capacitor C1 and the reactor L1 constitute an AC input filter (low-pass filter) that passes AC power from the AC power source 1 through the converter 5 and suppresses leakage of a signal of a carrier frequency generated by the converter 5 to the AC power source 1 side.

[0042] The converter 5 converts AC power from the AC power source 1 into DC power. The capacitor C4 is connected between an output node 5b of the converter 5 and the line of the reference voltage, and smoothes an output voltage of the converter 5. The output node 5b of the converter 5, an input node 6a of the inverter 6, and a first node 7a of the bidirectional chopper 7 are connected to each other. The inverter 6 converts DC power from the converter 5 or the bidirectional chopper 7 into AC power of a commercial frequency.

[0043] The reactor L2 and the switch S2 are connected in series between an output node 6b of the inverter 6 and the output terminal T3. The capacitor C2 is connected between a node between the reactor L2 and the switch S2 and the line of the reference voltage. The reactor L2 and the capacitor C2 constitute an AC output filter (low-pass filter) that passes AC power from the inverter 6 through the load 3 and suppresses leakage of a signal of a carrier frequency generated by the inverter 6 to the load 3 side.

[0044] The switch S2 is turned on at an inverter power supply mode in which AC power generated by the inverter 6 is supplied to the load 3, and turned off at a bypass power supply mode in which AC power from the AC power source 1 is supplied to the load 3 via the bypass unit 30. In addition, the switch S2 is turned off at maintenance time or at failure time of the UPS unit 20.

[0045] The switch S3 and the reactor L3 are connected in series between the battery terminal T2 and the second node 7b of the bidirectional chopper 7. The capacitor C3 is connected between a node between the switch S3 and the reactor L3 and a line of the reference voltage. The switch S3 is turned on in normal times and turned off, for example, at the time of maintenance of the UPS unit 20 or the battery 2. The capacitor C3 and the reactor L3 constitute a low-pass filter that passes the direct-current power and suppresses leakage of a signal of a carrier frequency generated by the bidirectional chopper 7 to the battery 2 side.

[0046] The bidirectional chopper 7 supplies the direct-current power generated by the converter 5 to the battery 2 in normal times when the alternating-current power is supplied from the alternating-current power source 1, and supplies the direct-current power of the battery 2 to the inverter 6 at the time of a power failure when the supply of the alternating-current power from the alternating-current power source 1 is stopped.

[0047] The switch S4 is connected between the output terminal T3 and the fan 22. The switch S4 is turned on in normal times and turned off, for example, at the time of maintenance of the UPS unit 20.

[0048] Here, the operation of the UPS unit 20 is briefly described. In normal times when the alternating-current power is supplied from the alternating-current power source 1, the alternating-current power is converted into the direct-current power by the converter 5. The direct-current power is converted into the alternating-current power by the inverter 6 and supplied to the load 3, and stored in the battery 2 by the bidirectional chopper 7.

[0049] If a power failure occurs and the supply of the alternating-current power from the alternating-current power source 1 is stopped, the operation of the converter 5 is stopped, the direct-current power of the battery 2 is supplied to the inverter 6 by the bidirectional chopper 7, and converted into the alternating-current power by the inverter 6 and supplied to the load 3. Thus, even in the case where a power failure occurs, the operation of the load 3 can be continued during a period in which the direct-current power is stored in the battery 2.

[0050] The bypass unit 30 includes an input terminal T4, an output terminal T5, switches S5, S6, and a fan 32. The terminals T4, T5 are connected to the terminals T11, T13, respectively. The switch S5 is connected between the terminals T4, T5. The switch S5 is turned on in the bypass power supply mode and turned off in the inverter power supply mode. The switch S6 is connected between the output terminal T5 and the fan 32. The switch S6 is turned on in the bypass power supply mode and turned off in the inverter power supply mode.

[0051] As described above, the uninterruptible power supply device 100 is provided with a plurality of UPS units 20 and bypass units 30 connected in parallel between the alternating-current power source 1 and the load 3. Thus, the number of the UPS units 20 and the bypass units 30 connected in parallel can be adjusted according to the size of the load 3, and as a result, various loads can be easily coped with.

[0052] As described above, the air introduced into the inside of the frame 110 through the air holes of the front cover of the frame 110 passes through each unit, thereby cooling the plurality of UPS units 20 and the bypass unit 30. The air heated by passing through each unit is discharged to the outside of the frame 110 from the upper surface 110A of the frame 110.

[0053] Next, the cooling structure of the uninterruptible power supply device 100 will be described with reference to Figures 5 to 7

[0054] Figure 5 is a perspective view schematically showing the state of the uninterruptible power supply device 100 viewed from the back surface side. Figure 1 is a front view of the uninterruptible power supply device 100 shown in Figure 6 Figure 1 is a rear view of the uninterruptible power supply device 100 shown in Figure 7 is a side view of the uninterruptible power supply device 100 shown in Figure 1

[0055] As shown in Figure 5 , the air holes 23 are formed in the back surface of the UPS unit 20. When the fan 22 (not shown) built in the UPS unit 20 is operated, air is introduced into the inside of the UPS unit 20 through the air holes 21 (not shown) of the front surface of the UPS unit 20. The introduced air is discharged from the air holes 23 after passing through the inside of the UPS unit 20. Figure 1 Figure 1

[0056] The air holes 33 are formed in the back surface of the bypass unit 30. When the fan 32 (not shown) built in the bypass unit 30 is operated, air is introduced into the inside of the bypass unit 30 through the air holes 31 (not shown) of the front surface of the bypass unit 30. The introduced air is discharged from the air holes 33 after passing through the inside of the bypass unit 30. Figure 1 Figure 1

[0057] The arrows F1 to F6 in each drawing schematically show the flow of air introduced into the inside of each unit and discharged from each unit. The air discharged from each unit flows toward the upper surface 110A of the frame 110 through the gap formed between the inner surface of the frame 110 and the outer surface of the plurality of units 20, 30. The air reaching the upper surface 110A is discharged to the outside of the frame 110 by the fan units 120, 122, 124.

[0058] A partition member 150 is provided in the gap between the inner surface of the frame 110 and the outer surface of the plurality of units 20, 30. As shown in Figure 7 , the partition member 150 is arranged in the gap portion 140 formed between the back surfaces of the plurality of units 20, 30 and the back surface 110C of the frame 110. ​​​​​​​

[0059] As Figure 5 illustrated, the partition member 150 has a partition plate 150A extending in the X-axis direction and dividing the gap portion 140 in the Z-axis direction, and partition plates 150B, 150C extending in the Z-axis direction and dividing the gap portion 140 in the X-axis direction. The partition plate 150A corresponds to an embodiment of the "first partition portion", the partition plate 150B corresponds to an embodiment of the "second partition portion", and the partition plate 150C corresponds to an embodiment of the "third partition portion".

[0060] As Figure 5 illustrated, in a case where the plurality of units 20, 30 are composed of 6 layers, the partition plate 150A is disposed, for example, at a boundary portion between the UPS unit 20 of the 3rd layer from the lower surface 110B and the UPS unit 20 of the 4th layer. However, the disposition position of the partition plate 150A is not limited to this, and the partition plate 150A can be disposed at a boundary portion of two layers of units adjacent in the Z-axis direction.

[0061] In Figure 5 the example, by the partition plate 150A, the plurality of units 20, 30 are divided into a first unit group composed of three layers of units located on the upper surface 110A side and a second unit group composed of three layers of units located at a position lower than the first unit group. In addition, the number of units included in the first unit group and the number of units included in the second unit group can also be different numbers. That is, according to the disposition position of the partition plate 150A, the number of units included in the first unit group and the second unit group can be made different from each other.

[0062] The first end portion in the Z-axis direction of the partition plate 150B is connected to the first end portion in the X-axis direction of the partition plate 150A, and the second end portion in the Z-axis direction is connected to the upper surface 110A. The first end portion in the Z-axis direction of the partition plate 150C is connected to the second end portion in the X-axis direction of the partition plate 150A, and the second end portion in the Z-axis direction is connected to the upper surface 110A. The partition plates 150B, 150C each extend in the Z-axis direction.

[0063] As Figure 7 illustrated, by the partition member 150, two ventilation paths 160, 162 for guiding air discharged from the back surfaces of the plurality of units 20, 30 to the upper surface 110A are formed inside the frame 110. The ventilation path 160 is formed by a space in the gap portion 140 divided by the partition member 150. The fan unit 120 is disposed at a downstream end of the ventilation path 160. The ventilation path 160 corresponds to an embodiment of the "first ventilation path", and the fan unit 120 corresponds to an embodiment of the "first fan unit".

[0064] By employing this structure, as indicated by arrows F1 to F3 in the drawings, air discharged from the back surface of the UPS units 20 (first unit group) of the fourth to sixth layers is guided to the upper surface 110A through the ventilation path 160, and is discharged to the outside of the frame 110 through the fan unit 120.

[0065] The ventilation path 162 is formed by the space outside the space divided by the partition member 150 in the gap portion 140 and the gap portions 142, 144 (refer to FIG. 2) between the side surfaces 110D, 110E of the frame 110 and the side surfaces of the plurality of units 20, 30. Figure 6 ) The fan units 122, 124 are disposed at the downstream end of the ventilation path 162. The ventilation path 162 corresponds to an embodiment of the "second ventilation path", the fan unit 122 corresponds to an embodiment of the "second fan unit", and the fan unit 124 corresponds to an embodiment of the "third fan unit".

[0066] By employing this structure, as indicated by arrows F4 to F6 in the drawings, air discharged from the back surface of the bypass units 30 of the first layer to the UPS units 20 (second unit group) of the third layer is guided to the upper surface 110A through the ventilation path 162, and is discharged to the outside of the frame 110 through the fan units 122, 124.

[0067] Specifically, as indicated by arrows F4 to F6 in the drawings, air discharged from the back surface of the bypass units 30 of the first layer to the UPS units 20 of the third layer flows in the +X-axis direction and the -X-axis direction. Figure 6 The air branched in these two directions is guided to the upper surface 110A through the gap portions 142, 144, respectively, and is discharged to the outside of the frame 110 through the fan units 124, 122.

[0068] As explained above, in the present embodiment, in the uninterruptible power supply device 100 in which the plurality of units 20, 30 are housed in the frame 110 in the stacking direction, the plurality of units 20, 30 are divided by the partition member 150 (partition plate 150A) of the gap portion 140 in the frame 110 into a first unit group composed of at least one unit 20 located on the upper surface 110A side and a second unit group composed of at least one unit 20, 30 located at a position lower than the first unit group.

[0069] Further, in the above structure, a gap between the inner surface of the frame 110 and the outer surfaces of the plurality of units 20, 30 is formed with an air passage 160 (first air passage) for circulating air discharged from the first unit group and an air passage 162 (second air passage) for circulating air discharged from the second unit group. The air passage 160 and the air passage 162 are divided by the partition member 150. The air passage 160 is formed by the gap portion 140 facing the back surface of the first unit group, and the air passage 162 is formed by the gap portion 140 facing the back surface of the second unit group and the gap portions 142, 144 facing the side surfaces of the first and second unit groups. Further, fan units 120, 122, 124 for discharging air circulated in the air passages 160, 162, respectively, to the outside of the frame 110 are provided on the upper surface 110A of the frame 110.

[0070] According to the present embodiment, air discharged from the units included in the first and second unit groups can be efficiently guided to the upper surface 110A of the frame 110 through the air passages 160, 162 and discharged to the outside of the frame 110. In particular, the passage of air discharged from the second unit group can be ensured, and thus the decrease in the amount of ventilation of the air can be suppressed. Thus, it is not necessary to divide the plurality of units into two rows and house them in the frame and provide a wind tunnel for each row as in Patent Literature 1. Thus, the installation area of the frame can be downsized.

[0071] Further, according to the present embodiment, unevenness in the air circulated in the inside of the units does not occur in each of the plurality of units 20, 30 as in Patent Literature 2.

[0072] As a result, according to the present embodiment, the cooling performance of the plurality of units 20, 30 housed in the frame 110 can be improved without increasing the installation area of the frame 110.

[0073] It should be understood that the embodiments disclosed herein are illustrative only and not restrictive of the scope of the application. The scope of the application is defined by the claims and not by the description of the embodiments above, and intends to include all modifications equivalent within the meaning and scope of the claims.

[0074] BRIEF DESCRIPTION OF DRAWINGS

[0075] 1 AC power supply

[0076] 2 battery

[0077] 3 load

[0078] 5 converter

[0079] 6 inverter

[0080] 7 bidirectional chopper

[0081] 20 UPS unit

[0082] 21, 23, 31, 33 vent hole

[0083] 22, 32, 130 fan

[0084] 30 bypass unit

[0085] 100 uninterruptible power supply device

[0086] 110 frame body

[0087] 110A upper surface

[0088] 110B lower surface

[0089] 110C back surface

[0090] 110D, 110E side surface

[0091] 111 opening portion

[0092] 112 leg portion

[0093] 120, 122, 124 fan unit

[0094] 140, 142, 144 gap portion

[0095] 150 partition member

[0096] 150A, 150B, 150C partition plate

[0097] 160, 162 vent passage

Claims

1. A power conversion device, characterized by, Possessing: a frame having a rectangular parallelepiped shape; a plurality of units housed in the frame in a stacked manner in an up-down direction; a plurality of fan units arranged on an upper surface of the frame; and a partition member arranged in a gap portion formed between a back surface of the frame and outer surfaces of the plurality of units; the plurality of units each having a fan built therein, the fan being configured to take in air into a corresponding unit and discharge the taken-in air toward the gap portion, the partition member including: a first partition portion arranged at a boundary portion of two units adjacent in the up-down direction among the plurality of units and extending in a left-right direction of the frame; and a second partition portion and a third partition portion each connected to both end portions in the left-right direction of the first partition portion and extending toward the upper surface of the frame; a gap between an inner surface of the frame and the outer surfaces of the plurality of units has a first air passage and a second air passage divided by the partition member, air discharged from a first group of units located at a position higher than the first partition portion flows in the first air passage and is guided to the upper surface of the frame, air discharged from a second group of units located at a position lower than the first partition portion flows in the second air passage and is guided to the upper surface of the frame, the plurality of fan units include: a first fan unit arranged at a downstream end of the first air passage; and a second fan unit and a third fan unit arranged at downstream ends of the second air passage.

2. The power conversion device according to claim 1, wherein the first air passage is formed by a space divided by the partition member in the gap portion, the second air passage is formed by an outer side of the space divided by the partition member in the gap portion and a gap portion between a side surface of the frame and a side surface of the plurality of units.

3. The power conversion device according to claim 1 or 2, wherein the first to third fan units each have a plurality of fans arranged on the upper surface of the frame.

4. The power conversion device according to claim 1 or 2, wherein the first fan unit is arranged at a position on the upper surface of the frame that is on a back surface side relative to the second and third fan units, the second and third fan units are each arranged at an end portion in the left-right direction of the frame on the upper surface of the frame.

5. The power conversion device according to claim 1 or 2, wherein the plurality of units each include: a front surface and a back surface formed with air holes; and the fan; the fan sucks in air from the front surface of the corresponding unit and discharges the air from the back surface of the unit toward the gap portion.

6. The power conversion device according to claim 1 or 2, wherein the power conversion device is an uninterruptible power supply device connected between an alternating-current power source and a load, ​ The plurality of units includes a plurality of uninterruptible power supply units connected in parallel between the alternating-current power source and the load.

7. The power conversion device according to claim 6, wherein The plurality of uninterruptible power supply units each includes: a converter that converts alternating-current power supplied from the alternating-current power source into direct-current power; and an inverter that, during normal times when alternating-current power is supplied from the alternating-current power source, supplies the load with direct-current power generated by the converter after conversion into alternating-current power, and, during power failure when supply of alternating-current power from the alternating-current power source is stopped, supplies the load with direct-current power stored in an electric storage device after conversion into alternating-current power.

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