Power conversion device

Abstract

To improve cooling performance of a reactor in a downsized power conversion device.SOLUTION: A power conversion device (100) includes a pair of orthogonal power converters (2), three phase reactors (3) respectively connected to the orthogonal power converters (2), and a housing (1) that houses the pair of orthogonal power converters (2) and the pair of three phase reactors (3). The pair of DC / AC power converters (2) is disposed on a lower side inside the housing (1), the pair of three phase reactors (3) is juxtaposed on the DC / AC power converters (2) so as to face each other at an interval, and terminals of the same phase of the pair of three phase reactors (3) are disposed so as to face each other and connected to each other via a connection bar (8). The housing (1) includes a main exhaust port (16a) that discharges air flowing between the pair of three phase reactors (3).SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a power conversion device including a reactor. [Background technology]

[0002] Conventionally, power conversion devices in which reactors are arranged inside a housing have been known. For example, Patent Document 1 discloses a power conversion device in which cooling air is drawn in through an air intake provided in the housing of a reactor panel, cools reactors arranged in an upper chamber and a lower chamber of the panel of the housing, and is then exhausted to the outside by a fan provided in the ceiling of the device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-122942 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the power conversion device described above is large in size because the reactors are arranged in the upper and lower compartments of the panel.

[0005] Furthermore, power conditioners, which function as power conversion devices, often have a configuration in which a power converter such as an inverter is placed at the bottom inside the housing, with multiple reactors placed above it. In such power conditioners, providing a passage for exhaust air from the ceiling between the reactors to improve the reactor's cooling performance requires a large housing. Meanwhile, attempts to miniaturize power conditioners make it difficult to improve the reactor's cooling performance.

[0006] An object of one aspect of the present disclosure is to improve the cooling performance of a reactor in a miniaturized power conversion device. [Means for solving the problem]

[0007] In order to solve the above problems, a power conversion device according to one embodiment of the present disclosure includes a pair of orthogonal power converters, three-phase reactors connected to the respective orthogonal power converters, and a housing that houses the pair of orthogonal power converters and the pair of three-phase reactors, wherein the pair of orthogonal power converters are arranged on a lower side inside the housing, and the pair of three-phase reactors are arranged juxtaposed above the orthogonal power converters at a distance so as to face each other, and the same-phase terminals of the pair of three-phase reactors are arranged so as to face each other and are connected via a connecting member, and the housing has an exhaust port provided in a ceiling portion for discharging air flowing between the pair of three-phase reactors. [Effects of the Invention]

[0008] According to one aspect of the present disclosure, it is possible to improve the cooling performance of a reactor in a miniaturized power conversion device. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a circuit diagram illustrating an electrical configuration of a power conversion device according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a perspective view showing the external configuration of the power conversion device. [Figure 3] FIG. 2 is a front view showing the internal structure of the power conversion device. [Figure 4] FIG. 2 is a side view showing the internal structure of the power conversion device. [Figure 5] 3 is a top view showing the configuration of a pair of three-phase reactors in the power conversion device. FIG. [Figure 6] 3 is a bottom view showing the configuration of a pair of three-phase reactors in the power conversion device. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] [Embodiment] An embodiment of the present disclosure will be described in detail below.

[0011] <Configuration of power conversion device> Fig. 1 is a circuit diagram showing the electrical configuration of a power conversion device 100 according to this embodiment. Fig. 2 is a perspective view showing the external configuration of the power conversion device 100. Fig. 3 is a front view showing the internal structure of the power conversion device 100. Fig. 4 is a side view showing the internal structure of the power conversion device 100.

[0012] As shown in Fig. 1, the power conversion device 100 converts DC power output from a storage battery 200 due to discharge into AC power and supplies the AC power to a power grid, and also converts AC power from the power grid into DC power and supplies the DC power to the storage battery 200 for charging. The power conversion device 100 is used, for example, as a power conditioner. The power conversion device 100 includes a housing 1, a pair of AC-to-DC power converters 2, a pair of three-phase reactors 3, and a capacitor 4.

[0013] The housing 1 houses a pair of orthogonal power converters 2, a pair of three-phase reactors 3, and a capacitor 4. The structure of the housing 1 will be described in detail later.

[0014] The AC power converter 2 is a device that converts DC power and AC power in both directions. Specifically, the AC power converter 2 converts DC power output from the storage battery 200 into AC power. The AC power converter 2 also converts AC power that has passed through a pair of three-phase reactors 3 and capacitors 4 from the power grid into DC power and outputs it to the storage battery 200.

[0015] Each of the pair of three-phase reactors 3 is connected to each of the pair of orthogonal power converters 2. The pair of three-phase reactors 3 are arranged in parallel. As will be described later, the three-phase reactor 3 has terminals (first terminal 34 and second terminal 35) for the U phase, V phase, and W phase, respectively. The first terminals 34 of the pair of three-phase reactors 3 of the same phase are connected to each other. The connection structure of the pair of three-phase reactors 3 will be described in detail later.

[0016] The capacitor 4 is configured for three phases and is connected to the U-phase, V-phase, and W-phase terminals of the three-phase reactor 3. The pair of the three-phase reactor 3 and the capacitor 4 configures an LC filter.

[0017] <Housing structure> 2 to 4, the housing 1 has a rectangular parallelepiped shape and includes a bottom 11, a front surface 12, a rear surface 13, a left side surface 14, a right side surface 15, and a ceiling surface 16.

[0018] The bottom 11 is the part that faces the floor and is formed in a rectangular shape. The edge of one long side of the bottom 11 is the front side, and the edge of the other long side of the bottom 11 is the rear side. The bottom 11 is provided with a plurality of support legs 11a that support the pair of quadrature power converters 2. The ceiling 16 has the same shape as the bottom 11 and is disposed so as to face the bottom 11. The ceiling 16 forms the ceiling of the housing 1.

[0019] The front surface 12, rear surface 13, left side surface 14, and right side surface 15 respectively form the front surface, rear surface, left side surface, and right side surface of the housing 1. A capacitor 4 is fixed to the left side surface 14. Specifically, a support member 141 is attached to the left side surface 14 at a position slightly below the center in the up-down direction. The capacitor 4 is fixed to the support member 141 (see FIG. 3).

[0020] A pair of AC power converters 2 are arranged on the lower side inside the housing 1. Furthermore, a pair of three-phase reactors 3 are arranged on the upper side inside the housing 1 in parallel with and spaced apart from the AC power converters 2 so as to face each other.

[0021] In the following description, the three-phase reactor 3 arranged on the left side surface portion 14 side will be referred to as a three-phase reactor 3A, and the three-phase reactor 3 arranged on the right side surface portion 15 will be referred to as a three-phase reactor 3B, as appropriate.

[0022] The front surface 12 has a frame 12a, a rear wall 12b, an intake port 12c, an exhaust port 12d, lower louvers 12e (first louvers), and upper louvers 12f (second louvers). The rear surface 13 has a frame 13a, a rear wall 13b, an intake port 13c, an exhaust port 13d, lower louvers 13e (first louvers), and upper louvers 13f (second louvers).

[0023] The frame portions 12a and 13a are frame-shaped portions that are provided over the entire outer periphery of the front portion 12 and the back portion 13. The rear wall portions 12b and 13b are provided inside the frame portions 12a and 13a, respectively, and are walls that are formed slightly further back than the frame portions 12a and 13a.

[0024] Air intakes 12c and 13c are through-holes that introduce air from the outside into the inside of housing 1, and are provided in multiple locations at the bottom of rear wall portions 12b and 13c, respectively. Air intakes 12c and 13c are formed as slits that extend horizontally and are arranged vertically at intervals.

[0025] The outlets 12d, 13d are through holes that discharge air flowing from a fan 23 (described later) provided in the orthogonal power converter 2 to the lower ends and sides of the pair of three-phase reactors 3 to the outside of the housing 1. A plurality of outlets 12d, 13d are provided in the upper part of the rear wall 12b in an area to the sides of the pair of three-phase reactors 3 and in a certain area below that area. The outlets 12d, 13d are formed as slits extending horizontally and are arranged vertically spaced apart.

[0026] The lower louvers 12e, 13e are louvers that guide air from outside diagonally downward to the air intakes 12c, 13c, respectively. The lower louvers 12e, 13e are provided in the lower parts of the rear wall portions 12b, 13c, respectively, in the same number as the air intakes 12c, 13c. The lower louvers 12e, 13e have approximately the same width as the rear wall portions 12b, 13b, and are formed to face diagonally downward relative to the rear wall portions 12b, 13b. The lower louvers 12e, 13e are attached to the rear wall portions 12b, 13b, respectively, slightly above the air intakes 12c, 13c, so as to form pairs with the air intakes 12c, 13c.

[0027] The upper louvers 12f, 13f are louvers that guide the air discharged from the exhaust ports 12d, 13d diagonally upward. The upper louvers 12f, 13f are provided in the same number as the exhaust ports 12d, 13d at the top of the rear wall portions 12b, 13c, respectively. The upper louvers 12f, 13f have approximately the same width as the rear wall portions 12b, 13b and are formed to face diagonally upward relative to the rear wall portions 12b, 13b. The upper louvers 12f, 13f are attached to the rear wall portions 12b, 13b, respectively, slightly below the exhaust ports 12d, 13d so as to form pairs with the exhaust ports 12d, 13d.

[0028] The ceiling portion 16 has a main exhaust port 16a (exhaust port) and two sub-exhaust ports 16b. The main exhaust port 16a is provided in the center of the ceiling portion 16 in the width direction of the housing 1. The main exhaust port 16a is formed in a rectangular area that is long in the depth direction of the housing 1. The sub-exhaust ports 16b are provided above a pair of three-phase reactors 3 on both sides of the main exhaust port 16a, spaced apart from the main exhaust port 16a, in the ceiling portion 16. The sub-exhaust ports 16b are formed in a rectangular area that is long in the depth direction of the housing 1 and slightly smaller in shape than the main exhaust port 16a.

[0029] Main exhaust port 16a is a through-hole that mainly discharges air flowing between a pair of three-phase reactors 3. Main exhaust port 16a is formed in the shape of a slit extending in the depth direction of housing 1, and a plurality of main exhaust ports 16a are formed so as to be spaced apart in the width direction of housing 1. Alternatively, main exhaust port 16a may be configured such that the rectangular region described above is formed as a single through-hole, and the through-hole is blocked with a net or the like to allow ventilation. Alternatively, main exhaust port 16a may be formed in the shape of a slit as described above, and be blocked with a net or the like.

[0030] The sub-exhaust port 16b is a through-hole that mainly discharges air heated by heat generated at the upper end of the three-phase reactor 3. The sub-exhaust port 16b has the same structure as the main exhaust port 16a described above.

[0031] <Configuration of Quadrature Power Converter> The quadrature power converter 2 has a case 21 (exterior body), a main body 22, a fan 23, and a heat sink 24.

[0032] The case 21 forms the outer shell of the quadrature power converter 2 and is in the form of a vertically long rectangular parallelepiped. The case 21 houses a main body 22, a fan 23, and a heat sink 24. An upper end exhaust port 21a is provided at the upper end of the case 21. The upper end exhaust port 21a is provided to exhaust air sent by the fan 23. The upper end exhaust port 21a has the same structure as the main exhaust port 16a described above.

[0033] The main body 22 constitutes the portion of the AC-DC power converter 2 that is involved in power conversion. The main body 22 includes, as its main part, various circuit components that constitute the power conversion circuit, a substrate on which the circuit components are mounted, wiring components, etc. The circuit components include active components such as semiconductors and passive components such as resistors and capacitors. The main body 22 generates heat because it includes heat-generating components as circuit components. The main body 22 is located on the lower side inside the case 21.

[0034] The main body 22 has a terminal 22a. The terminal 22a is a terminal for connecting to an external device (here, a three-phase reactor 3). The terminal 22a is formed so as to protrude outward from the surface of the case 21 on the side of the front part 12. The main body 22 also has a transistor 22b as the semiconductor. An IGBT (Insulated Gate Bipolar Transistor) or the like is used as the transistor 22b.

[0035] The heat sink 24 has a main cooling section 24a and a heat conducting section 24b. The main cooling section 24a forms the main cooling section and is located at the top inside the case 21. The heat conducting section 24b is formed to extend downward from the central section in the width direction of the housing 1 on the lower end surface of the main cooling section 24a. The heat conducting section 24b is provided so as to contact the outer peripheral side surface of the transistor 22b, and conducts heat generated by the transistor 22b to the main cooling section 24a. With this configuration, the heat sink 24 absorbs heat from the transistor 22b, which is the main heat source of the main body section 22, and cools the main body section 22.

[0036] The fan 23 is disposed above the main body 22 inside the case 21. The fans 23 are also disposed on both sides of the heat conduction portion 24b directly below the main cooling portion 24a of the heat sink 24. A plurality of fans 23 are provided for each AC power converter 2 to increase the air intake capacity of the power conversion device 100. The plurality of fans 23 form a fan unit, and one fan unit is provided on each side of the heat conduction portion 24b. The fans 23 draw in air introduced through the air intakes 12c, 13c and send the air upward through the inside of the main body 22, thereby cooling the main cooling portion 24a of the heat sink 24.

[0037] <Three-phase reactor details> Fig. 5 is a top view showing the configuration of the pair of three-phase reactors 3. Fig. 6 is a bottom view showing the configuration of the pair of three-phase reactors 3.

[0038] 3 to 6, the three-phase reactor 3 has a core fastening iron plate 31, a core 32, a winding 33, a first terminal 34 (terminal), and a second terminal 35. The core fastening iron plate 31 is an iron plate that fastens and fixes the core 32. Also, as shown in FIG. 5, the pair of three-phase reactors 3 are arranged to face each other with a distance D between them.

[0039] In FIG. 4, one three-phase reactor 3 is omitted so that the other three-phase reactor 3 can be seen.

[0040] The winding 33 is composed of a U-phase winding 33u, a V-phase winding 33v, and a W-phase winding 33w. The windings 33u, 33v, and 33w are arranged side by side in the depth direction of the housing 1. The windings 33u, 33v, and 33w are formed in a rectangular shape that is short in the depth direction of the housing 1 and long in the width direction of the housing 1.

[0041] Core 32 has leg iron portions 32u that form the core of winding 33u, leg iron portions 32v that form the core of winding 33v, and leg iron portions 32w that form the core of winding 33w. Although not shown, core 32 also has upper yoke portions that are horizontally arranged to magnetically couple the upper ends of leg iron portions 32u, 32v, and 32w, and lower yoke portions that are horizontally arranged to magnetically couple the lower ends of leg iron portions 32u, 32v, and 32w.

[0042] The first terminals 34 are terminals connected to the electric power grid. The second terminals 35 are terminals connected to the AC-to-DC power converter 2. The first terminals 34 include a U-phase first terminal 34u, a V-phase first terminal 34v, and a W-phase first terminal 34w for each of the windings 33u, 33v, and 33w. The second terminals 35 include an R-phase second terminal 35r, an S-phase second terminal 35s, and a T-phase second terminal 35t for each of the windings 33u, 33v, and 33w.

[0043] In the following description, the "first terminal" will be referred to as first terminals 34u, 34v, and 34w when the respective phases are specified, and will be referred to as first terminal 34 when the respective phases are not specified. Furthermore, the "second terminal" will be referred to as second terminals 35r, 35s, and 35t when the respective phases are specified, and will be referred to as second terminal 35 when the respective phases are not specified.

[0044] Each of the first terminals 34u, 34v, and 34w has a lead-out portion 34a and a horizontal portion 34b. The lead-out portion 34a is formed so as to be drawn downward from the lower end of one short side of the windings 33u, 33v, and 33w. The horizontal portion 34b is formed so as to be further away from the center of the windings 33u, 33v, and 33w than the lower end of the lead-out portion 34a and to extend horizontally.

[0045] Each of the second terminals 35r, 35s, and 35t has a lead-out portion 35a and a horizontal portion 35b. The lead-out portion 35a is formed so as to extend diagonally downward from a position at the lower end of the windings 33u, 33v, and 33w that is closer to the center of the windings 33u, 33v, and 33w than the position where the lead-out portion 34a is drawn out, and is away from the center of the windings 33u, 33v, and 33w. The horizontal portion 35b is formed so as to extend horizontally and is further away from the center of the windings 33u, 33v, and 33w than the lower end of the lead-out portion 35a. The horizontal portion 35b is connected to a connection structure 9, which will be described later.

[0046] A pair of three-phase reactors 3 are arranged such that the windings 33u face each other, the windings 33v face each other, and the windings 33w face each other, and the first terminals 34 of the same phase face each other, and the second terminals 35 of the same phase face each other.

[0047] For this reason, one three-phase reactor 3 (for example, three-phase reactor 3A) has a configuration in which the windings 33u, 33v, and 33w are normally arranged, while the other three-phase reactor 3 (for example, three-phase reactor 3B) has the windings 33u and 33w swapped. Alternatively, both of a pair of three-phase reactors 3 may have the windings 33u, 33v, and 33w normally arranged, and the windings 33u and 33w may be swapped in one of the three-phase reactors 3. That is, the winding 33u is treated as the winding 33w, and the winding 33w is treated as the winding 33u.

[0048] The first terminals 34u, 34v, 34w of the same phase that face each other are connected between the three-phase reactors 3A, 3B via a connection bar 8 (connection member). Specifically, the connection bar 8 and the pair of facing first terminals 34 are connected by bolt fastening.

[0049] In order to connect the first terminal 34 to the power system, a connection structure extending from the connection bar 8 to the outside of the housing 1 is formed by a plurality of bus bars. For convenience, illustration and description of this connection structure are omitted.

[0050] <Internal structure of power conversion device> The power conversion device 100 includes a reactor support structure 5, a wind direction plate 6, a blocking plate 7 (blocking member), a connection structure 9, and a heat shield plate 10.

[0051] The reactor support structure 5 is a structure that supports a pair of three-phase reactors 3 on the housing 1. The reactor support structure 5 has a bracket 51, a support angle 52, a support member 53, and a fixing angle .

[0052] Brackets 51 are attached to the inner surfaces of left side surface 14 and right side surface 15 at four locations close to front surface 12 and rear surface 13. Brackets 51 are positioned so that their upper end surfaces are positioned at a height that is a predetermined distance from the upper end of AC power converter 2.

[0053] Two support angles 52 are provided, and both ends of each are fixed to the upper end surfaces of a pair of brackets 51 that face each other on the left side surface 14 and right side surface 15. As a result, the pair of support angles 52 are arranged parallel to and close to the inner surfaces of the front surface 12 and rear surface 13.

[0054] The support members 53 are rectangular columnar members, two of which are provided for each three-phase reactor 3. The two support members 53 corresponding to one three-phase reactor 3 are arranged in opposing positions on a pair of parallel support angles 52. The two support members 53 provided on one support angle 52 corresponding to one pair of three-phase reactors 3 are arranged at a predetermined distance. The support members 53 are fixed to the support angles 52 by bolting.

[0055] Two fixing angles 54 are provided for each three-phase reactor 3. Each pair of fixing angles 54 is mounted on two opposing supports 53 of a pair of parallel support angles 52. The pair of fixing angles 54 are arranged parallel to each other in the width direction of the housing 1 at a predetermined interval. Both ends of each fixing angle 54 are fixed to the supports 53 by bolting. The fixing angles 54 support the lower end of the core tightening iron plate 31 of the three-phase reactor 3.

[0056] The air deflectors 6 are provided to guide the air sent from the fan 23 of the orthogonal power converter 2 between the pair of three-phase reactors 3 and to prevent it from flowing downward inside the housing 1. Two air deflectors 6 are provided, and each is formed in a rectangular shape with a length slightly shorter than the width of the inner wall surfaces of the left side surface portion 14 and the right side surface portion 15. The air deflectors 6 are arranged so that their longitudinal direction coincides with the depth direction of the housing 1.

[0057] One of the wind deflectors 6 is arranged with its lower edge positioned between the orthogonal power converter 2 arranged closer to the right side surface 15 and the inner surface of the right side surface 15, and is tilted so that its upper edge is positioned above the case 21. The other wind deflector 6 is arranged with its lower edge positioned at the upper end of the case 21 of the orthogonal power converter 2 arranged closer to the left side surface 14, closer to the left side surface 14, and is tilted so that its upper edge is positioned above the case 21.

[0058] The blocking plate 7 is a plate-shaped member that blocks the upper and lower internal spaces of the housing 1. The blocking plate 7 is disposed inside the housing 1 at a height above the intake ports 12c and 13c and below the upper-end exhaust port 21a of the case 21 so as to surround the pair of AC power converters 2. However, a portion of the blocking plate 7 is cut out in an area where a fourth bus bar 94 (described later) of the AC power converter 2 is disposed.

[0059] The heat shield 10 is a plate-like member having heat-shielding properties for suppressing heating of the left side surface portion 14 and the right side surface portion 15 due to heat generation from the three-phase reactor 3. Two heat shields 10 are provided. One heat shield 10 is attached to the left side surface portion 14 on the side of one three-phase reactor 3A. The other heat shield 10 is attached to the right side surface portion 15 on the side of the other three-phase reactor 3B.

[0060] By providing the heat shield 10, it is possible to prevent the heat from affecting other devices that are placed adjacent to the power conversion device 100. Furthermore, if no other devices are placed adjacent to the power conversion device 100, it is possible to prevent the heat from affecting people who touch the left side surface portion 14 and the right side surface portion 15.

[0061] The connection structure 9 is a structure that electrically connects second terminals 35 of a pair of three-phase reactors 3 and terminals 22a of main bodies 22 of a pair of orthogonal power converters 2. A large current flows between the orthogonal power converter 2 and the three-phase reactor 3. For this reason, the second terminals 35 and terminals 22a are connected by bus bars. The connection structure 9 has a first bus bar 91, a second bus bar 92, a third bus bar 93, and a fourth bus bar 94 as the bus bars.

[0062] First bus bar 91 is a bus bar that has been bent into an L-shape like an angle. A horizontal portion of first bus bar 91 is connected to horizontal portion 35b of second terminal 35. First bus bar 91 has a hanging portion that hangs down from the horizontal portion.

[0063] The second bus bar 92 is a bus bar formed in a strip shape. The upper end of the second bus bar 92 is connected to the hanging portion of the first bus bar 91. The second bus bar 92 is disposed so that its lower end faces diagonally downward as appropriate so as to be located in a position close to the position of the terminals 22a of each phase of the orthogonal power converter 2 and the width direction of the housing 1 (see FIG. 3).

[0064] Third bus bar 93 is a bus bar that has been bent into an L-shape like an angle. Third bus bar 93 is connected to the lower end of second bus bar 92 at an opposing portion that faces the lower end of second bus bar 92. Third bus bar 93 has a vertical portion that extends perpendicular to the opposing portion (in the depth direction of housing 1). Third bus bar 93 is arranged so that its end protrudes above terminal 22a (see FIG. 4).

[0065] Fourth bus bar 94 is a bus bar formed in a strip shape. An upper end of fourth bus bar 94 is connected to an end of third bus bar 93 that protrudes above terminal 22a. A lower end of fourth bus bar 94 is connected to terminal 22a.

[0066] Thus, in the connection structure 9, the first bus bar 91, the second bus bar 92, the third bus bar 93, and the fourth bus bar 94 are arranged so that their respective faces are aligned in the vertical direction. In other words, the first bus bar 91, the second bus bar 92, the third bus bar 93, and the fourth bus bar 94 are arranged so that their respective faces do not obstruct the flow of air from the pair of quadrature power converters 2 as much as possible.

[0067] <Air flow in the power conversion device> In the power conversion device 100, the cool air around the lower part of the housing 1 is drawn into the inside of the housing 1 by the suction force of the fan 23. The air passing through the air intakes 12c and 13c from the outside of the housing 1 is introduced obliquely from below by the lower louvers 12e and 13e.

[0068] The heat sink 24 absorbs heat from the transistor 22b through the heat conducting portion 24b and accumulates it in the main cooling portion 24a. The air introduced into the housing 1 passes through the inside of the AC-to-AC power converter 2 and is sent by the fan 23 to the main cooling portion 24a arranged above the fan 23. The main cooling portion 24a is cooled by the air from the fan 23.

[0069] This prevents heat from passing through the fan from the heat sink, as occurs in conventional configurations where a fan is placed on a heat sink, making the fan 23 less susceptible to heat-related deterioration, and thus extending the life of the fan 23.

[0070] Furthermore, in conventional power conversion devices that have a fan mounted on the ceiling of the housing, high-temperature air that cools the three-phase reactors located at the top of the housing passes through the fan, making the fan susceptible to thermal degradation. In contrast, in power conversion device 100, fan 23 is located below the pair of three-phase reactors 3. This makes fan 23 less susceptible to thermal degradation. This allows for a longer lifespan of fan 23.

[0071] The air that has passed through the heat sink 24 is discharged from the upper exhaust port 21a of the case 21 and is redirected by the airflow direction vane 6 so that it is directed between the pair of three-phase reactors 3. Furthermore, the air leaking out from the airflow direction vane 6 attempts to flow into the lower internal space of the housing 1, but the blocking plate 7 almost completely blocks this movement into the lower internal space. In this way, the flow of air into the lower internal space is blocked. This prevents the air drawn in from the air intakes 12c, 13c from being heated by the hot air leaking out from the airflow direction vane 6, which would otherwise reduce the cooling effect.

[0072] Here, the connection structure 9 is disposed between the pair of orthogonal power converters 2 and the pair of three-phase reactors 3. The bus bars constituting the connection structure 9 are disposed so that their respective faces are aligned vertically. This causes a portion of the air sent upward from the upper-end exhaust port 21a of the orthogonal power converter 2 to flow along the faces of the bus bars as it passes through the connection structure 9. Therefore, the connection structure 9 hardly obstructs the flow of air from the pair of orthogonal power converters 2 to the pair of three-phase reactors 3.

[0073] A portion of the air that reaches the lower ends of the pair of three-phase reactors 3 from the pair of orthogonal power converters 2 flows between the pair of three-phase reactors 3, cools the pair of three-phase reactors 3, and is then discharged mainly through the main exhaust port 16a to the outside of the housing 1. The rest of the air that has flowed between the pair of three-phase reactors 3 cools the upper ends of the pair of three-phase reactors 3, and is then discharged mainly through the sub-exhaust port 16b to the outside of the housing 1.

[0074] The remaining air that reaches the lower ends of the pair of three-phase reactors 3 flows laterally from the lower ends of the pair of three-phase reactors 3A and 3B, and is then discharged to the outside mainly through the exhaust ports 12d and 13d, and also through the sub-exhaust port 16b.

[0075] In this way, in the power conversion device 100, the air that has cooled the pair of three-phase reactors by flowing toward the lower ends and sides thereof is discharged from the outlets 12d and 13d to the outside of the housing 1. This makes it possible to improve the cooling effect of the pair of three-phase reactors 3.

[0076] Additionally, the air discharged from the exhaust ports 12d and 13d is guided obliquely upward by the upper louvers 12f and 13f to the periphery of the upper part of the housing 1. On the other hand, the cool air around the lower part of the housing 1 is introduced into the interior of the housing 1 from obliquely downward through the intake ports 12c and 13c by the lower louvers 12e and 13e.

[0077] As a result, lower louvers 12e and 13e can introduce lower air into the interior of housing 1, and upper louvers 12f and 13f can guide air discharged to the sides of housing 1 upward. This makes it difficult for the cold air around the lower part of housing 1 to mix with the warm air discharged around the upper part of housing 1. This allows the cold air around the lower part of housing 1 to be introduced through air intakes 12c and 13c.

[0078] Furthermore, the reactor support structure 5 is configured so that the lower end of the three-phase reactor 3 is open, which allows the lower end of the three-phase reactor 3 to be cooled efficiently.

[0079] As shown in FIG. 5, the first terminals 34 of a pair of three-phase reactors 3 are arranged so that those of the same phase face each other and are connected via a connection bar 8. This reduces the area occupied by the connection bar 8 between the pair of three-phase reactors 3. This ensures a large space between the pair of three-phase reactors 3. This allows more air to pass between the pair of three-phase reactors 3 and be discharged from the main exhaust port 16a. This improves the cooling performance of the three-phase reactors in the miniaturized power conversion device 100.

[0080] In contrast, when a pair of three-phase reactors with U-phase, V-phase, and W-phase windings normally arranged are arranged opposite each other, the central V-phase windings face each other. However, the U-phase winding of one three-phase reactor faces the W-phase winding of the other three-phase reactor, and the W-phase winding of one three-phase reactor faces the U-phase winding of the other three-phase reactor. This is the same as the state in which the windings 33u and 33w of three-phase reactor 3B in the pair of three-phase reactors 3 shown in FIG. 5 are swapped, for example.

[0081] Therefore, when the U-phase terminals and the W-phase terminals of a pair of three-phase reactors are connected to each other, the connecting bars connecting them intersect. Furthermore, the distance between the U-phase terminals and the distance between the W-phase terminals are long. This requires long connecting bars, which increases the area occupied by the connecting bars between the pair of three-phase reactors. Therefore, in this configuration, the space between the pair of three-phase reactors is narrower than in the power conversion device 100, which impedes airflow and reduces the cooling performance of the three-phase reactors.

[0082] 〔summary〕 A power conversion device according to a first aspect of the present disclosure includes a pair of orthogonal power converters, three-phase reactors connected to each of the orthogonal power converters, and a housing that houses the pair of orthogonal power converters and the pair of three-phase reactors, wherein the pair of orthogonal power converters are arranged on a lower side inside the housing, and the pair of three-phase reactors are arranged juxtaposed above the orthogonal power converters at a distance so as to face each other, and the same-phase terminals of the pair of three-phase reactors are arranged so as to face each other and are connected via connecting members, and the housing has an exhaust port provided in a ceiling portion for discharging air flowing between the pair of three-phase reactors.

[0083] In the above configuration, terminals of the same phase are connected so that the connecting members do not cross each other. This reduces the area occupied by the connecting members between the pair of three-phase reactors. This allows a larger space to be secured between the pair of three-phase reactors. This allows more air to pass between the pair of three-phase reactors and be discharged through the exhaust port of the housing. This improves the cooling performance of the three-phase reactor in a miniaturized power conversion device.

[0084] A power conversion device according to a second aspect of the present disclosure may be configured in such a way that, in the first aspect, the housing has an air intake port provided at the bottom of the housing for introducing air from the outside into the inside of the housing, and the AC-DC power converter has a fan for sending the air introduced from the air intake port upward.

[0085] In the above configuration, the air drawn in through the air intake by the fan cools the power converter and flows toward the three-phase reactor. This prevents the high-temperature air that has cooled the three-phase reactor from passing through the fan, as occurs in the power conversion device described in Patent Document 1. This makes it less likely for the fan to deteriorate due to heat. This, in turn, extends the life of the fan.

[0086] A power conversion device according to a third aspect of the present disclosure is the second aspect, wherein the orthogonal power converter has an exterior body forming an outer casing, and an upper end exhaust port is provided at the upper end of the exterior body to discharge air sent by the fan, and the power conversion device may further include a blocking member above the air intake port and below the upper end exhaust port inside the housing to block an upper internal space and a lower internal space.

[0087] With this configuration, it is possible to block the flow of air discharged upward from the upper exhaust port and reaching downward, thereby preventing the air drawn in from the intake port from being heated by mixing with the air that has cooled the power converter.

[0088] A power conversion device according to a fourth aspect of the present disclosure may be the second or third aspect, wherein the orthogonal power converter is arranged on the underside of the housing and further includes a main body that generates heat and a heat sink that cools the main body, and the fan is arranged on the main body and the heat sink is arranged on the fan.

[0089] In the above configuration, the air that has passed through the main body is sent to the heat sink by the fan. As a result, the heat sink, which has absorbed the heat from the main body, is cooled by the air from the fan. Therefore, unlike a configuration in which the fan is placed on the heat sink, heat from the heat sink does not pass through the fan. This makes it less likely that the fan will deteriorate due to heat. This, in turn, allows for a longer lifespan of the fan.

[0090] In the power conversion device according to a fifth aspect of the present disclosure, in the second or third aspect, the housing may be provided on the side of the pair of three-phase reactors and may have an exhaust port for exhausting air flowing from the fan to the lower ends and sides of the pair of three-phase reactors to the outside.

[0091] According to the above configuration, the air from the fan flows to the lower ends and sides of the pair of three-phase reactors, and the air that has cooled the pair of three-phase reactors can be discharged to the outside of the housing through the outlet, thereby improving the cooling effect of the pair of three-phase reactors.

[0092] A power conversion device according to a sixth aspect of the present disclosure may be configured such that, in the fifth aspect, the housing has a first louver that guides air from the outside to the intake port diagonally downward, and a second louver that guides air discharged from the exhaust port diagonally upward.

[0093] In the above configuration, the first louver allows cool air around the lower part of the housing to be introduced into the housing from the air intake port diagonally downward, and the second louver allows air warmed by cooling the pair of three-phase reactors to be discharged diagonally upward from the air outlet to the upper part of the housing. This makes it difficult for the cool air around the lower part of the housing taken into the housing from the air intake port and the warm air discharged from the air outlet around the upper part of the housing to mix. Therefore, the cool air around the lower part of the housing can be introduced from the air intake port.

[0094] [Additional Notes] The present disclosure is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. In addition, embodiments obtained by appropriately combining the technical means disclosed in the embodiments are also included in the technical scope of the present disclosure. [Explanation of symbols]

[0095] 1 chassis 2 Quadrature power converter 3 Three-phase reactor 7 Closure plate (closure member) 8 Connection bar (connection member) 12c,13c intake 12d,13d outlet 12e, 13e Lower louver (first louver) 12th and 13th floor upper louvers (second louvers) 16 Ceiling 16a Main exhaust port (exhaust port) 21 Case (exterior body) 21a Upper exhaust port 22 Main body 23 Fans 24 Heatsink 34,34u,34v,34w 1st terminal (terminal) 100 Power conversion device

Claims

1. a pair of quadrature power converters; a three-phase reactor connected to each of the orthogonal power converters; a housing that houses the pair of orthogonal power converters and the pair of three-phase reactors, the pair of quadrature power converters are disposed on a lower side inside the housing, the pair of three-phase reactors are arranged in parallel at a distance from each other so as to face each other on the orthogonal power converter, and the same-phase terminals of the pair of three-phase reactors are arranged so as to face each other and are connected via a connecting member; The power conversion device, wherein the housing has an exhaust port provided in a ceiling portion for discharging air flowing between the pair of three-phase reactors.

2. the housing has an air intake port provided in a lower portion of the housing for introducing air from the outside into the housing; The power conversion device according to claim 1 , wherein the AC-DC power converter has a fan that blows the air introduced through the air intake port upward.

3. the orthogonal power converter has an exterior body that forms an outer shell, an upper end exhaust port for discharging air sent by the fan is provided at an upper end of the exterior body; The power conversion device according to claim 2 , further comprising a closing member that closes an upper internal space and a lower internal space above the intake port and below the upper-end exhaust port inside the housing.

4. the AC power converter is arranged below the housing and further includes a main body that generates heat and a heat sink that cools the main body; the fan is disposed on the main body; The power conversion device according to claim 2 or 3, wherein the heat sink is disposed above the fan.

5. The housing includes:

4. The power conversion device according to claim 2, further comprising an outlet provided on a side of the pair of three-phase reactors, for discharging air flowing from the fan toward lower ends and sides of the pair of three-phase reactors to the outside.

6. The housing includes: a first louver that guides air from the outside to the air intake port from diagonally below; The power conversion device according to claim 5 , further comprising: a second louver that guides the air discharged from the outlet obliquely upward.

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