JP2013126305A - Power conversion unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power conversion unit that complicates entry of rainwater and others into a power conversion device storage chamber while keeping intake efficiency intact.SOLUTION: An intake duct 31 is formed continuously stepwise by an upper surface 33 upstream with respect to the direction of intake and an upper surface 34 downstream with respect to the direction of intake having a greater altitude from an intake port 11F than the upper surface 33 upstream with respect to the direction of intake. The intake port 11F is formed in opposition to the upper surface 33 upstream with respect to the direction of intake. The upper surface 34 downstream with respect to the direction of intake has a discharge port 31A formed to introduce outside air taken in through the input port 11F into a power conversion device storage chamber 11Q.

Description

  The present invention relates to a power conversion unit including a housing-like storage box that houses a power conversion device used in a photovoltaic power generation system and enables cooling accompanying operation of the power conversion device.

  Solar power generation systems have low environmental impact and can constrain resources, so development has progressed as a countermeasure for global issues such as environmental pollution and exhaustion of energy resources due to exhaust gas containing carbon dioxide, which is the basis of global warming, Installation not only in commercial buildings and public facilities but also in ordinary households is becoming widespread.

  This solar power generation system is generally used by converting DC power generated by a solar cell module by sunlight into AC power by a power converter. And when installing a power generation system simultaneously with construction of a building, a power converter is often arranged indoors with wiring.

  However, when installing a power generation system as a renovation in an existing building or installing it in a rental apartment building, there are cases in which the power conversion device has to be installed outdoors for the convenience of wiring.

  At this time, since the power conversion device is equipped with electronic parts and the like, it is configured exclusively for indoor installation, and cannot be installed and operated as it is. For this reason, it is conceivable to specially design and manufacture a power conversion unit having specifications that can withstand wind and rain, but the number of power conversion devices increases and the cost increases.

  Therefore, a housing box is constituted by a box-shaped box body having a front opening and accommodating the power conversion device, and a door that seals the front opening, and waste heat due to operation of the power conversion device is possible. What protects the power converter device installed outdoors from a wind and rain by the power conversion unit which provided the intake / exhaust part so that it becomes is known (for example, refer patent document 1).

JP 2006-066819 A

  In the power conversion unit described above, a prismatic intake duct having a straight intake path is arranged at the intake port for taking outside air into the storage box.

  Therefore, in such an intake duct having a linear intake path, there has been a problem that rainwater or the like easily enters from the intake port into the storage box.

  Therefore, an object of the present invention is to provide a power conversion unit that can prevent rainwater or the like from entering the inside of a box while suppressing a decrease in intake efficiency.

  In order to solve the above problems, a power conversion unit of the present invention includes a box-shaped box body having a front opening and having a power conversion device housing chamber inside, and a door for opening and closing the front opening of the box body. An air intake duct that is provided on a bottom surface of the power converter housing chamber and that is introduced from an air inlet formed in a bottom plate of the box body and that introduces air into the power converter housing chamber, and an internal air of the power converter housing chamber An exhaust fan for exhausting air, and the intake duct includes an upper surface on the upstream side in the intake direction and an upper surface on the downstream side in the intake direction, the height from the intake port being higher than the upper surface on the upstream side in the intake direction. It is formed in a continuous step shape, and the intake port is formed opposite to the upper surface on the upstream side in the intake direction, and the outside air taken in from the intake port is stored in the upper surface on the downstream side in the intake direction. Led to the room Wherein the discharge port for are formed.

  According to the power conversion unit of the present invention, rainwater or the like can be made difficult to enter the power conversion device storage chamber while suppressing a decrease in intake efficiency.

  The power conversion unit of the present invention is characterized in that a filter member is provided at the discharge port.

  According to the power conversion unit of the present invention, the filter member can further suppress the entry of rainwater and the like.

  In the power conversion unit of the present invention, the filter member has a two-layer structure of a wire mesh filter and a breathable filter.

  According to the power conversion unit of the present invention, it is possible to prevent insects from entering the box body from the inside of the intake duct and the entry of rainwater and the like.

  In the power conversion unit of the present invention, the height from the upper surface on the upstream side in the intake direction to the upper surface on the downstream side in the intake direction is higher than the height from the intake port to the upper surface on the upstream side in the intake direction. It is characterized by that.

  According to the power conversion unit of the present invention, it is possible to effectively suppress the entry of rainwater or the like by effectively utilizing the intake path from the outside to the power conversion device storage chamber, although it has a simple configuration.

  Furthermore, the power conversion unit of the present invention protrudes on the inner side of the intake duct, in the vicinity of the inner wall surface of the upper surface on the upstream side in the intake direction so as to block a part of the intake path from the intake port to the discharge port. A partition plate is provided, and a gap is formed between the partition plate and the inner wall surface of the upper surface on the downstream side in the intake direction.

  According to the power conversion unit of the present invention, not only can the entry of rainwater and the like be further suppressed, but the design of the intake path can be easily changed, and the versatility with respect to the installation environment can be easily improved. be able to.

  The power conversion unit of the present invention can prevent rainwater or the like from entering the power conversion device storage chamber while suppressing a decrease in intake efficiency.

It is explanatory drawing of the solar power generation system for houses using the power conversion unit which concerns on one Embodiment of this invention. The power conversion unit which concerns on one Embodiment of this invention is shown, (A) is a front view of a power conversion unit, (B) is a schematic front view of the power conversion unit in the state which removed the door. 1 is a schematic perspective view of a power conversion unit with a door removed, showing a power conversion unit according to an embodiment of the present invention. 1 shows a power conversion unit according to an embodiment of the present invention, and is a schematic longitudinal sectional view of the power conversion unit. The intake part applied to the power conversion unit which concerns on one Embodiment of this invention is shown, (A) is a perspective view of an intake part, (B) is sectional drawing of an intake part. The air intake part of the modification 1 applied to the power conversion unit which concerns on one Embodiment of this invention is shown, (A) is sectional drawing of the air intake part of the modification 1, (B) is A- of FIG. It is sectional drawing which follows A line. The intake part of the modification 2 applied to the power conversion unit which concerns on one Embodiment of this invention is shown, (A) is sectional drawing of the intake part of the modification 2, (B) is B- of FIG. 7 (A). It is sectional drawing which follows a B line. The exhaust part applied to the power conversion unit which concerns on one Embodiment of this invention is shown, (A) is a front view of an exhaust part, (B) is a perspective view of an intake part. It is sectional drawing of the exhaust part applied to the power conversion unit which concerns on one Embodiment of this invention. It is sectional drawing of the exhaust part of the modification 1 applied to the power conversion unit which concerns on one Embodiment of this invention. The modification 2 applied to the power conversion unit concerning one embodiment of the present invention is shown, and (A) is a front view of an intake part, and (B) is a perspective view of an intake part. It is sectional drawing of the air intake part of the modification 2 applied to the power conversion unit which concerns on one Embodiment of this invention.

  Next, a power conversion unit according to an embodiment of the present invention is applied to a residential solar power generation system and described with reference to the drawings. The following embodiment is a preferred specific example of the power conversion unit of the present invention, and may have various technically preferable limitations. However, the technical scope of the present invention is not limited to the present invention. As long as there is no description which limits, it is not limited to these aspects. In addition, the constituent elements in the embodiments shown below can be appropriately replaced with existing constituent elements and the like, and various variations including combinations with other existing constituent elements are possible. Therefore, the description of the embodiment described below does not limit the contents of the invention described in the claims.

  FIG. 1 is an explanatory diagram of a residential solar power generation system using a power conversion unit according to an embodiment of the present invention, FIG. 2 shows a power conversion unit according to an embodiment of the present invention, and FIG. FIG. 2B is a schematic front view of the power conversion unit with the door removed, and FIG. 3 shows the power conversion unit according to the embodiment of the present invention with the door removed. FIG. 4 shows a power conversion unit according to an embodiment of the present invention, a schematic longitudinal sectional view of the power conversion unit, and FIG. 5 shows power conversion according to an embodiment of the present invention. FIG. 5A is a perspective view of the intake portion, FIG. 5B is a sectional view of the intake portion, and FIG. 6 is applied to the power conversion unit according to the embodiment of the present invention. FIG. 6 (A) shows the intake portion of the modified example 1 FIG. 6B is a cross-sectional view taken along line AA of FIG. 6A, and FIG. 7 is a second modification applied to the power conversion unit according to the embodiment of the present invention. FIG. 7A is a cross-sectional view of the air intake part of Modification 2, FIG. 7B is a cross-sectional view taken along line BB in FIG. 7A, and FIG. FIG. 8A shows a front view of the exhaust unit, FIG. 8B is a perspective view of the intake unit, and FIG. 9 shows an embodiment of the present invention. FIG. 10 is a cross-sectional view of an exhaust portion applied to the power conversion unit according to an embodiment of the present invention, and FIG. 11 is a cross-sectional view of the exhaust portion applied to the power conversion unit according to an embodiment of the present invention. FIG. 11 (A) is a front view of the intake portion, FIG. 11 (B) is a perspective view of the intake portion, and FIG. 2 is a sectional view of the intake section of the second modification is applied to the power conversion unit according to an embodiment of the present invention.

  In FIG. 1, in a power conversion unit 1 according to an embodiment of the present invention, a power conversion device 2 called a power conditioner is accommodated in a storage box 10. In addition, the storage box 10 is an outdoor installation type attached along the outer wall HA of the building H represented by a general house, and an indoor installation type attached along the inner wall (not shown) of the building H. Although it is applicable to any of the cases, the embodiment shown below describes the former outdoor installation type which has a large effect according to the present invention. At this time, for example, in a factory or the like where a lot of dust or the like is generated, the effect according to the present invention is great even when installed indoors.

  In the power conversion unit 1, a direct current converted from solar light energy by the solar cell module PV installed on the roof or roof of the building H is input from the first electric circuit 3 to the power conversion device 2 as generated power. The power conversion device 2 converts the generated power into AC power, supplies power from the second electric circuit 4 to the distribution board 6 installed in the room of the building H, and the like for home appliances (not shown) in the house. Distributed to the load. In addition, the distribution board 6 is connected to the commercial system 5 via the wattmeter 7 and, for example, the surplus power in the daytime is sold (sold) to the power company by a contract with the power company. When there is little power generation or no power generation, such as at night or at night, a so-called system linkage system is constructed in which power is purchased (purchased) from the power company as before.

  The power conversion device 2 has a function of converting a direct current converted from solar light energy by the above-described solar cell module PV into an alternating current, as well as absorption of sudden overcurrent (surge) due to backflow prevention or lightning strikes. Controls the operation of the entire residential solar power generation system, including its effects. Moreover, the power converter device 2 has various electronic components mounted therein, and during operation, these generate heat and become high temperature. Therefore, the operating temperature is maintained below a standard value (for example, 50 ° C. or lower) by an air cooling method, ensuring operational reliability and extending the life of the machine.

  As shown in FIGS. 2 to 4, the storage box 10 has a power conversion device storage chamber 11Q surrounded by an upper plate 11A, a back plate 11B, a left side plate 11C, a right side plate 11D, and a bottom plate 11E, and has a front opening. A box main body 11 formed with 11P and a door 12 for opening and closing the front opening 11P are provided. The power conversion device 2 described above is accommodated near the upper center of the power conversion device accommodation chamber 11Q. In addition, the power conversion device storage chamber 11Q includes an electric system section 20, an intake section 30 in which an intake port 11F is formed so that external air is taken into the bottom plate 11E, and both inner wall surfaces of the left and right plates 11C and 11D (whichever The exhaust part 40 which exhausts internal air from the exhaust fan 13 arrange | positioned at the upper part of (it may be either) is arrange | positioned. In the illustrated example, the exhaust fan 13 has a rectangular exhaust port 11G formed in the left side plate 11C and the right side plate 11D (only the exhaust port 11G formed in one right side plate 11D is shown in FIG. 3).

  The power conversion device 2 accommodates a required electric circuit unit for converting the generated power generated by the solar cell module PV into alternating current power, and has a substantially central arrangement between the left side plate 11C and the right side plate 11D. At a position inside the exhaust fan 13, the back plate 11 </ b> B is fixed to the left plate 11 </ b> C and the right plate 11 </ b> D so as to be spaced apart at substantially equal intervals. At this time, a heat radiating portion 2H having a heat sink structure for collecting and releasing heat generated from the electric circuit portion of the power conversion device 2 is disposed between the power conversion device 2 and the back plate 11B. The heat dissipating part 2H composed of a heat sink structure has a plurality of heat dissipating fins arranged in parallel at predetermined intervals on the left and right.

  At this time, the heat dissipating part 2H is arranged along the inner surface of the back plate 11B so that the air flow formed by the operation of the exhaust fan 13 flows through the space between the heat dissipating fins of the heat dissipating part 2H. Accordingly, each radiating fin extends in the vertical direction, and the air flow formed by the operation of the exhaust fan 13 flows from the lower side to the upper side so as to pass through the radiating fins.

  The electrical system unit 20 includes a wiring terminal block 21 for connecting required wiring. As shown in FIG. 3, the bottom plate 11 </ b> E of the storage box 10 has a first electric circuit 3 that is an input line through which generated power generated by the solar cell module PV is supplied to a terminal portion (not shown) of the power converter 2. An input-side wiring hole 11H through which a wiring code (not shown) passes is formed. Further, on the bottom plate 11E of the storage box 10, the wiring cord of the second electric circuit 4 which is an output line for outputting the AC power output from the terminal portion of the power converter 2 to the distribution board 6 via the terminal block 21. An output side wiring hole 11J through which (not shown) penetrates is formed. The electrical system unit 20 includes a terminal block temperature detector (for example, a thermal fuse) 22 that detects the temperature of the terminal block 21, and the first electric circuit 3 and the second electric circuit based on the detection of the terminal block temperature detector 22. 4 for detecting the temperature (inside air temperature) of the electromagnetic relay type switch 23 that shuts off one or both of the power converter 4 and the power conversion device storage chamber 11Q, and performing operation control (power supply control) of the exhaust fan 13 A branch terminal block 24 and a temperature switch 25 are provided as the temperature control unit 14.

  When the temperature switch 25 detects that the inside air temperature of the storage box 10 has become higher than a predetermined temperature, the exhaust fan 13 is powered and driven. Further, when the exhaust air fan 13 detects that the inside air temperature of the storage box 10 has become a predetermined low temperature or less by the temperature switch 25, the exhaust fan 13 stops driving by stopping the power supply. Thereby, the internal air temperature of the storage box 10 is maintained in a predetermined temperature range, and the electric circuit of the power conversion device 2 is protected while maintaining the heat dissipation effect by the heat dissipation portion 2H of the power conversion device 2. Further, by maintaining the temperature of the inside air of the storage box 10 within a predetermined temperature range, the terminal block 21, the switch 23, the branch terminal block 24, and the wiring connected thereto can be protected. In the present embodiment, the exhaust fan 13 has a fan case 15 that has a rectangular housing shape and enables air flow, a wing-shaped fan body 16, and a drive motor 17 that rotationally drives the fan body 16. It is equipped with. In the present embodiment, the exhaust fan 13 is not provided with a dustproof function such as a filter that serves as resistance to air (inside air).

  The intake section 30 includes an intake duct 31 that introduces outside air sucked from the intake port 11F into the power conversion device storage chamber 11Q, and a filter member 32 that is disposed at the downstream end of the intake duct 31 in the intake direction.

  The intake duct 31 includes an upstream upper surface 33 and a downstream upper surface 34 having a high height from the intake port 11F with reference to the intake direction having a low height from the intake port 11F (hereinafter, the same applies to upstream and downstream). It is formed in a continuous staircase shape. The intake port 11F described above is formed to face the upstream upper surface 33. The bottom plate 11E is provided with a wire net-like insect filter 35 so as to cover the intake port 11F.

  The downstream upper surface 34 is formed with a discharge port 31A for introducing outside air taken from the intake port 11F into the power conversion device storage chamber 11Q. In the present embodiment, the filter member 32 is disposed in the opening 34 a formed in the downstream upper surface 34, and the discharge port 31 </ b> A described above is formed in the filter member 32.

  The filter member 32 includes a detachable frame 36 screwed (not shown) to the downstream upper surface 34 so as to close the opening 34 a, an insect repellent filter 37 made of a wire mesh held by the frame 36, and a frame 36. And a dustproof filter 38 having air permeability. Thereby, the insect filter 37 can suppress the insect that has entered the inside of the intake duct 31 from the intake port 11F from entering the power conversion device storage chamber 11Q. Further, rainwater, dust, and the like entering the inside of the intake duct 31 from the intake port 11F are prevented from entering further on the inner surface of the upstream upper surface 33 facing the intake port 11F. Even if it enters, the dustproof filter 38 can prevent entry into the power conversion device storage chamber 11Q.

  Therefore. It is desirable to make the height H2 from the upstream upper surface 33 to the downstream upper surface 34 higher than the height H1 from the intake port 11F to the upstream upper surface 33.

  Incidentally, as shown in FIGS. 6 and 7, a part of the bent intake passage 31B extending from the intake port 11F to the discharge port 31A is blocked inside the intake duct 31, for example, in the vicinity of the inner wall surface of the upstream upper surface 33. You may provide the partition plate 39 which protruded in the. At this time, a gap S <b> 1 is formed between the partition plate 39 and the inner wall surface of the downstream upper surface 34. The partition plate 39 may be horizontal like the upstream upper surface 33, but is not particularly limited. Further, the partition plate 39 can be appropriately employed in consideration of the installation environment of the power conversion unit 1, for example, the installation height (ground height) of the storage box 10, the surrounding environment (for example, heavy snowfall area), and the like. . In addition, the shape, size, and number of the intake port 11F are not limited to those illustrated in the drawings, and for example, a shape such as a rectangle, a perfect circle, an ellipse, or an oval shape may be used singly or in a plurality (type and size). Including different combinations).

  Specifically, the partition plate 39 shown in FIG. 6 has a flat plate shape, and the partition plate 39 shown in FIG. 7 has an L-shaped cross section. At this time, as shown in FIGS. 6B and 7B, the width W2 of the partition plate 39 is increased with respect to the width W1 of the intake port 11F, and the width W2 of the partition plate 39 is set to the width of the discharge port 31A. The width is substantially the same as the width. Further, the widths of the partition plate 39, the intake port 11F, and the discharge port 31A are arranged at the same position in the width direction with the centers of the widths. Thereby, a clearance S2 for bypassing the intake air is formed between the partition plate 39 and the inner surface of the intake duct 31, and the clearance S2 is positioned so as not to overlap the partition plate 39 and the discharge port as viewed from above (discharge port side). Be placed. Thus, by arranging the partition plate 39, the intake port 11F, and the discharge port 31, it is possible to secure a wide intake area while suppressing the entry of rainwater. Further, by making the protruding end of the partition plate 39 substantially the same as the opening edge portion of the discharge port 31A, the intake port 11F can be expanded to the vicinity of the discharge port 31A, which can contribute to the improvement of the intake efficiency. . Further, although the width W2 of the partition plate 39 is set to be substantially the same as the width of the discharge port 31A, the width W2 of the partition plate 39 may be smaller than the width of the discharge port 31A. Thereby, it can contribute to suppression of entering of rainwater. Further, although the width W2 of the partition plate 39 is wider than the width W1 of the intake port 11F, the width W1 of the intake port 11F may be increased to substantially the same width as the width W2 of the partition plate. Thereby, it can contribute to the improvement of intake efficiency.

  As shown in FIGS. 8 and 9, the exhaust unit 40 includes an exhaust cover 41 fixed to the outer surfaces of the side plates 11C and 11D so as to cover the exhaust port 11G from the outside. The exhaust cover 41 includes a peripheral wall 42 that covers the periphery of the exhaust port 11G, an inclined wall portion 43 that is separated from the side plates 11C and 11D toward the lower side from the upper wall portion 42a of the peripheral wall 42, and a lower portion of the inclined wall portion 43. A vertical wall portion 44 that is parallel to the side plates 11C and 11D from the edge to the bottom wall portion 42b, at least one exhaust hole 42c formed in the bottom wall portion 42b of the peripheral wall 42, and extends substantially horizontally to the vertical wall portion 44. A plurality of exhaust long holes 44a formed, an upwardly inclined exhaust guide 45 that is spaced apart from the exhaust long hole 44a upward from the lower edge of the inner wall surface of the exhaust long hole 44a, and the exhaust port 11G. In this way, a filter member 46 disposed inside the exhaust cover 41 is provided.

  The exhaust hole 42 c is formed between the filter member 46 and the vertical wall portion 44. As shown in FIG. 10, it is preferable to form the exhaust long hole 44a at the uppermost position below the lower line P1 of the exhaust fan 13. However, considering the exhaust capability, It may be hung on the lower side of the fan 13. In addition, the boundary between the inclined wall portion 43 and the vertical wall portion 44 is preferably located below the rotation center P <b> 2 of the exhaust fan 13 in consideration of the exhaust guide function by the inclined wall portion 43. Further, the shape, size, and number of the exhaust holes 42c are not limited to those in the illustrated example. For example, a shape such as a rectangle, a perfect circle, an ellipse, or an oval shape may be used alone or in a plurality (type and size). Including different combinations).

  The exhaust guide 45 is formed integrally with the vertical wall portion 44 by a continuous cut from the lower edge of the exhaust long hole 44a. An extension member may be provided at the tip of the exhaust guide 45 so that the back side of the exhaust long hole 44a is covered with the exhaust guide 45 and the extension member when viewed from the front. At this time, a simple plate-like metal plate or the like may be used as the extension member, and it may be fixed to the tip of the exhaust guide 45 by welding or the like, or may be provided on the lower (one or more) exhaust guide 45 or the lower side. The length in the extending direction (upward protruding direction) may be changed between the upper side and the upper side. These can be appropriately adopted in consideration of the installation environment of the power conversion unit 1, for example, the installation height (ground height) of the storage box 10, the surrounding environment (for example, heavy snowfall area), and the like.

  Further, as shown in FIGS. 11 and 12, the exhaust guide 45 may be constituted by another member joined to the inner wall surface of the vertical wall portion 44. At this time, the exhaust guide 45 is formed wider than the width along the major axis direction of the exhaust long hole 44a, so that there is no gap between the vertical wall portion 44 and the exhaust long hole 44a in the width direction. It can be effective for measures against rainwater and dust. Note that the shape, size, and number of the exhaust oblong holes 44a (particularly in the case of FIGS. 11 and 12) are not limited to those shown in the drawings. For example, they are rectangular, perfect circle, ellipse, oval, etc. Shapes such as molds can be formed singly or in plural (including combinations with different types and sizes). Further, by using the exhaust guide 45 constituted by this separate member, as shown in FIG. 11A, the rear surface side of the exhaust long hole 44a may be covered with the exhaust guide 45 in the front view ( Only the lowermost exhaust guide 45 is shown by a broken line).

  The filter member 46 is inserted into the bottom wall 42 b and is detachable by screwing (not shown), a wire netting insect filter 48 held by the holder 47, and the holder 47. A dustproof filter 49 having air permeability. Thereby, the insect filter 48 can prevent the insects that have entered the exhaust cover 41 from the exhaust holes 42c and the exhaust long holes 44a from entering the power conversion device storage chamber 11Q. In addition, rainwater, dust, and the like that have entered the exhaust cover 41 through the exhaust hole 42c and the exhaust long hole 44a can be prevented from entering the power conversion device storage chamber 11Q by the dustproof filter 49.

  By the way, in the present embodiment, the filter member 46 is disposed on the downstream side in the exhaust direction of the exhaust fan 13, and a plurality of exhaust holes 42 c and a plurality of exhaust lengths are formed in the bottom wall portion 42 b and the vertical wall portion 44 of the exhaust cover 41. By providing the hole 44a, it is possible to suppress a decrease in exhaust efficiency.

  Thus, in the present embodiment, when the exhaust switch 13 is driven by detecting that the temperature switch 25 is in a high temperature environment, outside air is introduced from the intake port 11F, and the filter member passes through the bent intake path 31B. Cooling outside air is introduced from the 32 outlets 31 </ b> A into the power conversion device storage chamber 11 </ b> Q.

  At this time, regardless of the driving of the exhaust fan 13, the entry of insects, rainwater and the like into the intake duct 31 is suppressed. Further, even when the exhaust fan 13 is driven or a heavy rain wind such as a storm is generated, the intake path 31B bent by the stepped upper surfaces 33 and 34 prevents the entry of rain water and the like, Further, the presence of the filter member 32 effectively prevents entry into the power conversion device storage chamber 11Q.

  The inside air that has cooled the heat radiating portion 2H having the heat sink structure is exhausted from the exhaust hole 11c through the exhaust cover 41 by the exhaust fan 13 through the exhaust hole 42c or the exhaust long hole 44a.

  At this time, the filter member 46 is disposed in the exhaust cover 41. However, the exhaust member 41 is exhausted by a plurality of exhaust holes 42c and exhaust long holes 44a formed in the bottom wall part 42c and the vertical wall part 44 of the exhaust cover 41. Since the path and the exhaust opening area are secured, the pressure loss of the exhaust efficiency can be minimized.

H ... Building HA ... Outer wall PV ... Solar cell module 1 ... Power conversion unit 2 ... Power converter 2H ... Heat radiation part 3 ... First electric circuit 4 ... Second electric circuit 5 ... Commercial system 6 ... Distribution board 7 ... Wattmeter 10 ... Storage box 11 ... Box body 11A ... Top plate 11B ... Back plate 11C ... Left side plate 11D ... Right side plate 11E ... Bottom plate 11F ... Intake port 11H ... Exhaust port 11H ... Input side wiring hole 11J ... Output side wiring hole 11P ... Front side opening 11Q Power storage device storage chamber 12 Door 13 Exhaust fan 14 Temperature controller 15 Fan case 16 Fan body 17 Drive motor 20 Electric system 21 Wiring terminal block 22 Terminal block temperature detector 23 Switch 24 ... Branch terminal block 25 ... Temperature switch 30 ... Intake section 31 ... Intake duct 31A ... Discharge port 31B ... Intake path 32 ... Filter member 33 ... Upstream side 34 ... Downstream upper surface 34a ... Opening 35 ... Insect-proof filter 36 ... Frame 37 ... Insect-proof filter 38 ... Dust-proof filter 39 ... Partition plate 40 ... Exhaust part 41 ... Exhaust cover 42 ... Peripheral wall 42a ... Upper wall part 42b ... Bottom wall part 42c ... Exhaust hole 43 ... Inclined wall portion 44 ... Vertical wall portion 44a ... Exhaust long hole 45 ... Exhaust guide 46 ... Filter member 47 ... Holder 48 ... Insect-proof filter 49 ... Dust-proof filter

Claims (5)

A box-shaped box body having a front opening and having a power conversion device storage chamber inside;
A door that opens and closes the front opening of the box body;
An air intake duct that introduces air taken from an air inlet provided on the bottom surface of the power converter housing chamber and formed in the bottom plate of the box body into the power converter housing chamber;
An exhaust fan for exhausting the inside air of the power converter housing chamber;
With
The intake duct is formed in a continuous step shape with an upper surface on the upstream side in the intake direction and an upper surface on the downstream side in the intake direction with a height from the intake port higher than the upper surface on the upstream side in the intake direction,
The intake port is formed opposite to the upper surface on the upstream side in the intake direction,
A power conversion unit, wherein a discharge port for introducing outside air taken from the intake port into the power conversion device storage chamber is formed on an upper surface on the downstream side in the intake direction.   2. The power conversion unit according to claim 1, wherein a filter member is provided at the discharge port.   The power conversion unit according to claim 1 or 2, wherein the filter member has a two-layer structure of a wire mesh filter and a filter having air permeability.   The height from the upper surface on the upstream side in the intake direction to the upper surface on the downstream side in the intake direction is higher than the height from the intake port to the upper surface on the upstream side in the intake direction. Item 4. The power conversion unit according to any one of Items3. Inside the intake duct, a partition plate is provided in the vicinity of the inner wall surface of the upper surface on the upstream side in the intake direction so as to block a part of the intake path from the intake port to the discharge port,
The power conversion unit according to any one of claims 1 to 4, wherein a gap is formed between the partition plate and an inner wall surface of the upper surface on the downstream side in the intake direction.

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