JP2011233804A - Interconnection inverter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interconnection inverter device capable of reducing thickness of a electrical housing even if natural air-cooling type is adopted.SOLUTION: An electrical housing that houses an interconnection inverter including a converter circuit unit and an inverter circuit unit, is equipped with heat sinks 6 having high heat dissipation effect in each of both right and left side faces of the housing body including the circuits of the interconnection inverter. An isolation transformer 35 of the converter circuit is placed adjacently to one side of the heat sink 6, and an AC reactor 36 of the inverter circuit is placed adjacently to another side of the heat sink 6 so that heat generated in these components is radiated from each of both right and left side faces of the housing body and a heat sink at the rear side of the housing body can be thinned.

Description

  The present invention relates to a grid-connected inverter device, and more particularly to a structure of an electrical housing that houses circuit components of a grid-connected inverter.

  A grid-connected inverter device called a power conditioner is used as a device for linking DC power generated by various private power generation facilities such as solar power generation facilities and fuel cell power generation facilities to a commercial power system ( Note that a grid-connected inverter for a photovoltaic power generation facility is sometimes called a solar inverter).

  This type of grid-connected inverter device converts a DC voltage input from a private power generation facility into a stable and constant voltage, and converts DC power obtained by the converter circuit into AC power having a predetermined voltage. Since these circuit components include components that generate a large amount of heat when energized, the electrical equipment housing the grid-connected inverter prevents the temperature inside the housing from increasing. Is provided.

  This type of cooling includes a forced air cooling type that forcibly ventilates the inside of the enclosure with a ventilation fan, and a temperature inside the enclosure by heat radiation by a radiator (heat sink) without a ventilation fan. There are natural air-cooled types that can be lowered, but for grid-connected inverter devices that are installed outdoors, if forced air-cooling is used, maintenance such as cleaning the filter for ventilation openings and intrusion of dust from the openings is possible. There is a problem in terms of reliability.

  For this reason, a naturally air-cooled casing is suitably employed in an outdoor installation type grid-connected inverter device (see, for example, Patent Document 1).

US Pat. No. 7,304,852

  However, the natural air-cooled casing has the following problems, and improvements have been desired.

  In other words, in a naturally air-cooled housing, heat radiation to the outside of the housing is exclusively performed by a radiator provided on the surface of the housing. Therefore, a housing that houses components that generate a large amount of heat when energized, such as a grid-connected inverter. When the natural air cooling system is adopted for the body, there is a problem that the radiator becomes large and the casing cannot be thinned.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a grid-connected inverter device that can reduce the thickness of an electrical housing even if a natural air cooling system is adopted. Is to provide.

  In order to achieve the above object, a grid-connected inverter device according to the present invention is an electrical housing apparatus that houses a grid-connected inverter having a converter circuit section and an inverter circuit section. A heat sink is provided on both the left and right side surfaces of the housing body to be accommodated, and the heat generating component of the converter circuit portion is disposed adjacent to the side surface of the housing having one heat sink, and the inverter circuit portion is provided on the side surface of the housing having the other heat sink. The heat generating parts are arranged adjacent to each other.

  Note that the heat-generating component means a component that generates heat when energized, and particularly refers to a component that has a large influence on the temperature rise in the housing. Therefore, parts that generate a small amount of heat even if they generate heat are excluded.

And as the suitable embodiment, the following composition is adopted.
(1) A circuit in which a circuit board on which other components of the converter circuit unit are mounted is disposed in the vicinity of the heat generating component of the converter circuit unit, and the other components of the inverter circuit unit are mounted in the vicinity of the heat generating component of the inverter circuit unit. A substrate is placed.

(2) The heat generating component of the converter circuit unit includes at least an insulating transformer, and the heat generating component of the inverter circuit unit includes at least an AC reactor.

(3) Each of the one radiator and the other radiator is formed integrally with the side surface of the housing.

(4) The casing body is a natural air-cooled casing that does not include an opening for ventilation.

(5) A thin radiator is provided on the front surface or the back surface of the housing body.
Here, a thin radiator means that it is thin in comparison with the radiators disposed on the left and right side surfaces of the casing body. Specifically, for example, the height of the fins constituting the radiator is the casing. It means that it is lower than that of the radiator that is placed on the left and right sides of the body.

  According to the present invention, the radiator is provided on the left and right side surfaces of the casing body that houses the circuit unit of the grid interconnection inverter, and the heat generating component of the converter circuit unit is disposed adjacent to the side surface of the casing that includes the one radiator. Since the heat generating component of the inverter circuit unit is disposed adjacent to the side surface of the housing having the other radiator, heat from the heat generating component of the converter circuit unit and the inverter circuit unit is efficiently radiated from the heat radiator on the side surface of the housing. Therefore, it is possible to reduce the thickness of the electrical housing while suppressing the temperature rise inside the housing.

  According to the invention of claim 2, the circuit board on which other components of the converter circuit unit are mounted is disposed in the vicinity of the heat generating component of the converter circuit unit, and the inverter circuit unit is disposed in the vicinity of the heat generating component of the inverter circuit unit. Since the circuit board on which other components are mounted is arranged, the wiring distance between the heat generating component and the circuit part including the heat generating component can be shortened, so that the influence of the reactance component of the wiring and the influence of noise due to the wiring are reduced. be able to.

It is the perspective view which looked at the external appearance of the grid connection inverter apparatus which concerns on this invention from the front side. It is the perspective view which looked at the external appearance of the same grid connection inverter apparatus from the back surface (wall surface) side. It is the plane sectional view which abbreviate | omitted and illustrated some internal electrical components in the housing | casing main body of the same grid connection inverter apparatus. It is an external view which shows an example of component arrangement | positioning in the housing body of the same grid connection inverter apparatus. It is a perspective view which shows an example of the engaging part for suspension in the housing | casing main body of the same grid connection inverter apparatus. It is the perspective view which looked at the external appearance of the attachment board of the same grid connection inverter apparatus from the front side. It is explanatory drawing which shows the procedure which attaches the electrical equipment housing | casing of the same grid connection inverter apparatus to an attachment board, Comprising: It is a perspective view which shows the state which leaned on the attachment board at the back upper end part of the electrical equipment housing | casing. It is the enlarged view which looked at the relationship between the electrical equipment housing | casing and the attachment plate in the state of FIG. 7 from the back side. It is explanatory drawing which shows the procedure which mounts the electrical equipment housing | casing of the same grid connection inverter apparatus to a mounting plate, Comprising: The state which made the engaging part for suspension of the electrical equipment housing engage with the receiving part for suspension of a mounting plate FIG. It is the enlarged view which looked at the relationship between the electrical equipment housing | casing in the state of FIG. 9, and a mounting plate from the back side. It is a perspective view which shows the state which removed the decorative door in the state of FIG. 9, Comprising: The rotation range of the lower end part of an electrical equipment housing | casing is shown. It is explanatory drawing which shows the procedure which attaches the electrical equipment housing | casing of the same grid connection inverter apparatus to an attachment board, Comprising: It is the perspective view which looked at the state which fixed the lower end part of the electrical equipment housing | casing to the attachment board from the back side.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Throughout the drawings, the same reference numeral indicates the same component or element.

Embodiment 1
A system interconnection inverter device according to the present invention is shown in FIGS.
The grid interconnection inverter apparatus shown in these figures accommodates in the electrical housing 1 a circuit unit of a grid linkage inverter for linking DC power generated by a private power generation facility such as a solar power generation facility to a commercial power system. Thus, the electrical housing 1 is attached with a mounting plate 2 that serves as a base when the electrical housing 1 is attached to a wall surface.

  The electrical housing 1 is a housing that houses electrical components and the like, and includes a housing body 3 that houses a circuit unit of the grid interconnection inverter, and a grid interconnection inverter that is housed in the housing body 3. It comprises a junction box 4 that accommodates terminals that connect external wiring to be connected, and a casing body 3 and a decorative door 5 that covers the front of the junction box 4.

  Here, the housing body 3 containing the circuit section of the grid interconnection inverter and the junction box 4 containing the wiring connection terminals are configured separately, and as shown in FIG. 1 or FIG. A junction box 4 is detachably attached to the lower end surface of the body body 3 by screws or the like. The casing body 3 and the junction box 4 are configured separately as described above when the electrical component or the like fails in either the casing body 3 or the junction box 4. This is so that only the failed unit (housing) can be replaced, repaired or inspected.

  As shown in FIG. 1 or 2, the housing body 3 is configured to include a plurality of radiating fins (projections) 6, 6,... The front panel 11, the pair of side panels 12a and 12b, the back panel 13, the top panel 14, and the bottom panel 15 constitute a box-shaped container.

  The front panel 11, the top panel 14, and the bottom panel 15 are panels constituting a front surface, an upper end surface (ceiling surface), and a lower end surface (bottom surface) of the housing body 3, respectively. For example, a panel made of aluminum or stainless steel is used. Note that an opening (not shown) for attaching the display unit 7 (see FIGS. 3 and 11) of the grid interconnection inverter housed in the housing body 3 is formed at a predetermined position of the front panel 11. . Also, the bottom panel 15 is connected to the through hole for passing the wiring connecting the electrical components of the housing body 3 and the terminals 40 in the junction box 4 to the housing body 3 and the junction box 4. Screw holes (both not shown) are provided. Since the casing body 3 employs a configuration including a natural air-cooled radiator as will be described later, a ventilation fan and an opening including the side panels 12a and 12b and the back panel 13 are provided. It is not done.

  The side panels 12a, 12b and the back panel 13 are all provided with heat radiation fins 6, 6,. These panels 12a, 12b, and 13 are each made of a metal having a high heat dissipation effect (for example, aluminum or copper). In this embodiment, these panels 12a, 12b, and 13 are made of heat dissipation fins 6, 6 respectively. ,... Are used as an extruded product of aluminum. In addition, the surface of these panels 12a, 12b, 13 made of an aluminum molded product is subjected to anodizing treatment (alumite processing) to improve corrosion resistance and heat dissipation.

  Here, the side panels 12a and 12b shown in FIG. 3 have a substantially L-shaped cross section so as to cover a part of the back surface of the housing body 3, but the back surface of the housing body 3 is one sheet. The side panels 12a and 12b can also be configured to cover only the side surfaces. The reason why it is configured as shown in FIG. 3 is that if the back panel 13 having a wide left and right width is a single extruded product, the manufacturing cost becomes high. Therefore, when the right and left width of the housing body 3 is wide, or when it is not necessary to increase the number of parts, the back panel 13 may be divided into two or more parts.

  The radiating fins 6, 6,... Provided in the side panels 12 a, 12 b and the back panel 13 are not naturally used by a ventilation fan that forcibly ventilates the air in the housing body 3, but are naturally air-cooled. The heat radiator which discharges the heat inside is formed. Basically, the shape of each radiating fin 6, that is, the size of the fin 6 (fin thickness and height) and the pitch between the radiating fins (interval between the adjacent surfaces of the adjacent radiating fins) Although it sets suitably according to the emitted-heat amount of the electrical component accommodated in the body main body 3, in this embodiment, it has the following characteristic structures.

  That is, the heat radiating fins 6 provided on the side panels 12 a and 12 b and the back panel 13 are arranged in parallel and spaced apart from each other over the entire length of the casing body 3 in the vertical direction, and radiate heat facing the mounting plate 2. A part of the fins 6, 6,...

  The suspension engaging portion 8 is used to suspend and hold the electrical housing 1 on the mounting plate 2, and is located, for example, at both left and right ends of the heat dissipating fins 6 facing the mounting plate 2. The connecting pin (connecting member) 20 made of a shaft-like member is bridged between the heat dissipating fins 6a and 6b and the heat dissipating fins 6a 'and 6b' adjacent to the inside (see FIG. 5).

  These connecting pins 20, 20 are arranged on the upper and lower sides of the housing main body 3 so that the housing main body 3 is held horizontally when the connecting pins 20, 20 are engaged with the engaging receiving portions 9 of the mounting plate 2. It is provided at the same height position in the direction. Further, the arrangement position is set in the vicinity of the upper end portions of the radiation fins 6a and 6b. This is because when the lower end portion of the electrical housing 1 is pulled out to the front with the connecting pins 20 and 20 as swinging fulcrums, the rear upper end portion of the housing body 3 comes into contact with the mounting plate 2 or the wall surface. This is to prevent the movement of the body 1 from being hindered.

  And it is preferable that the outer peripheral surface of the connecting pins 20 and 20 is formed of a curved surface so that the behavior of the electrical housing 1 using the connecting pins 20 and 20 as a swing fulcrum becomes smooth. For example, the connecting pins 20 and 20 are configured so that the cross-sectional shape thereof is circular or nearly circular. Further, the connecting pins 20 and 20 are attached so as not to easily fall off from the heat radiating fins 6. For example, as the connecting pins 20, a pin for killing or a fixable screw is used.

  In the side panels 12 a and 12 b shown in FIG. 3, the heat radiating fins 6 a and 6 b at the left and right end portions where the connecting pins 20 and 20 are disposed are on the back side of a part of the fins extending on the side surface side of the housing body 3. This is formed by providing fins extending in the direction, and as will be described later, this is formed on the guide protrusions 21a and 21b of the mounting plate 2 with the heat radiation fins 6a and 6b and the heat radiation fins 6a 'and 6b adjacent thereto. This is to secure a fitting margin when fitting the 'separated portions. That is, this is because the depth of the space between the radiation fins 6a and 6b and the radiation fins 6a 'and 6b' is set deep. Therefore, if the radiation fins 6a ′ and 6b ′ shown in FIG. 3 and the radiation fins adjacent to the inside of the radiation fins 6a ′ and 6b ′ are sufficiently high (depth of the separation portion), the connecting pins 20 and 20 are bridged between them. It may be.

  Another feature of the radiating fins 6, 6,... Is that the radiating fins 6, 6,. Further, in adopting such a configuration, the heat radiation fins 6, 6,... On both the left and right side surfaces are enlarged (for example, the height of the fins 6 is increased) to enhance the heat radiation effect from the left and right side surfaces. 6, 6,... Are small (for example, a thin radiator with a low fin 6 height). Specifically, the height of the radiating fins 6, 6,... Arranged on the back surface of the housing body 3 is lower than the radiating fins 6, 6,. It is set (see FIG. 3). The grid-connected inverter device according to the present invention adopts such a configuration, thereby reducing the thickness of the casing body 3 and thus the entire electrical casing 1. That is, in the electrical housing 1 shown in the present embodiment, the radiation fins 6, 6,... Provided on the left and right side surfaces of the housing body 3 are main radiators having a high heat radiation capability. The heat dissipating fins 6, 6,.

  When the radiating fins 6, 6,... Are configured in this way, the heat of the electrical components generated in the housing body 3 is efficiently released from the radiating fins 6, 6,. The circuit layout of the grid interconnection inverter is devised. Hereinafter, this point will be described with reference to FIG.

  As is well known, a grid interconnection inverter is a device for connecting DC power generated by a private power generation facility such as a solar power generation facility to a commercial power system, and this type of grid interconnection inverter is common. As a basic configuration, at least a DC-DC converter (converter circuit unit) that converts a DC voltage having an unstable voltage value input from a private power generation facility into a stable and constant voltage, and a DC obtained by the DC-DC converter. A DC-AC inverter (inverter circuit unit) that converts electric power into AC power having a predetermined voltage is provided. Note that an inverter capable of reverse operation for converting AC power supplied from the commercial power system into a predetermined DC voltage may be used for the inverter circuit unit.

  FIG. 4 shows an example of a grid-connected inverter circuit arrangement having such a basic configuration. In the illustrated case, the casing main body 3 has a DC-DC converter circuit section clockwise from the lower left. 31, a series-parallel circuit unit 32, a DC-AC inverter circuit unit 33, and a filter circuit unit 34 are arranged.

  The grid-connected inverter device of the present invention is an electric component that generates a large amount of heat in each of these circuit units, specifically, the insulation transformers 35a, 35b, 35c, and 35d of the DC-DC converter circuit, and the DC-AC inverter circuit. The AC reactors 36a and 36b are distributed in a divided manner on the left and right sides, and attached to the side panels 12a and 12b constituting the radiation fins 6, 6,. That is, a part with a large calorific value is arranged adjacent to the side panels 12a and 12b including the heat dissipating fins 6 serving as the main heat dissipator in the housing body 3, and is configured to dissipate heat through these.

  Here, when distributing these components having a large heat generation amount, it is desirable to arrange the heat generating components so that heat is radiated in a balanced manner from the heat radiating fins 6, 6,. Further, considering the work of attaching the electrical housing 1 to the mounting plate 2, it is preferable to balance the left and right weight balance as much as possible. Furthermore, in consideration of wiring noise and wiring reactance, it is preferable to disperse and arrange the circuit parts including the electrical parts as close as possible to shorten the wiring distance between the circuit and the parts. In particular, in a case where a resonant converter is used as the DC-DC converter, the reactance of the wiring affects the resonance, so that the wiring between the insulating transformers 35a, 35b, 35c, and 35d and the converter circuit unit 31 is desired to be short. It is.

  In the present embodiment, the insulating transformers 35a, 35b, 35c, and 35d, which are heat generating components of the DC-DC converter circuit unit 31, are not mounted on a circuit board on which other components of the DC-DC converter circuit unit 31 are mounted. The circuit board is mounted on the side panel 12a in a state independent from the board, and the circuit board on which other components of the circuit unit 31 are mounted is disposed in the vicinity of the insulating transformers 35a, 35b, 35c, and 35d (adjacent positions in the illustrated example). I am letting. Also, the AC reactors 36a and 36b, which are heat generating components of the DC-AC inverter circuit unit 33, are not mounted on the circuit board on which other components of the DC-AC inverter circuit unit 33 are mounted, but are made independent from the same substrate. In this state, the circuit board is mounted on the side panel 12b, and a circuit board on which other components of the circuit section 33 are mounted is disposed in the vicinity of the AC reactors 36a and 36b (adjacent positions in the illustrated example). Since the insulating transformer 37 of the series / parallel circuit unit 32 also constitutes a heat generating component, the insulating transformer 37 is not mounted on the circuit board on which other components of the series / parallel circuit unit 32 are mounted, and is independent from the substrate. It is attached to the side panel 12a. By adopting such a configuration, the electrical housing 1 of the present embodiment satisfies all the above-described requirements.

  Further, in this embodiment, the main radiator is arranged on both the left and right side surfaces of the casing body 3 and electric parts with a large amount of heat generation are attached to the main radiator. 1 is made thinner.

  The junction box 4 is a housing that houses terminals 40 for connecting wiring drawn into the electrical housing 1 from inside or outside. The terminals 40 housed in the junction box 4 include the DC -The terminal connected with the DC converter circuit part 31, the terminal connected with the filter circuit part 34, etc. are contained. And on the back surface, the left and right side surfaces, and the lower end surface (bottom surface) of the junction box 4, these terminals 40 and an indoor or outdoor external device (such as a distribution board connected to a private power generation facility or a commercial power system) A plurality of wiring insertion portions 41, 41,.

  The junction box 4 has a depth (in other words, a thickness of the junction box 4) of a space (internal space) that accommodates the terminals 40, which is substantially the same as the depth of the internal space of the housing body 3. Although set, the junction box 4 is not provided with the heat radiation fins 6 on the back like the case main body 3, so that the outer dimensions are thinner than the case main body 3. That is, when the connection part of the housing body 3 and the junction box 4 is viewed from the back side, a step A that is recessed toward the junction box is formed there.

  The decorative door 5 is an openable / closable door attached so as to cover the front surface of the housing body 3 and the junction box 4, and the decorative door 5 is detachably attached to the housing body 3 via a hinge 50. It has been.

  The mounting plate 2 is a member that serves as a base when the electrical housing 1 is mounted on a wall surface, and is configured by processing a metal plate such as iron into a shape as shown in FIG.

  Specifically, the mounting plate 2 is formed by bending and standing the left and right ends of a substantially rectangular metal plate corresponding to the shape of the electrical housing 1 to the front side (the side opposite to the wall surface). Two guide protrusions 21a and 21b extending in the vertical direction are formed at both ends, the lower end portion of the metal plate is bent to the front side, the lower end portion is projected to the front side, and the junction box 4 A joining flange portion 22 is formed. The overhang amount (height) of the joining flange portion 22 is set according to the step A on the back surface of the electrical housing 1 described above. That is, the joining flange portion 22 is set so as to come into contact with the back surface of the junction box 4 when the housing body 3 is mounted on the mounting plate 2. The joining flange portion 22 is provided with screw holes 25 and 25 for coupling to the junction box 4.

  In this metal plate, a rectangular portion at the center of the metal plate surrounded by the guide protrusions 21a and 21b and the joining flange portion 22 is a wall surface joint portion 23 used for joining to an indoor or outdoor wall surface. A plurality of long holes 24 are formed in the joint portion 23 to be screw holes when the attachment plate 2 is attached to the wall surface.

  Since the guide protrusions 21 a and 21 b function as guide rails when the electrical housing 1 is mounted on the mounting plate 2, the distance between the guide protrusions 21 a and 21 b is that of the electrical housing 1. The heat radiation fins 6, 6,... Are set according to the distance corresponding to the mutual separation distance (specifically, the distance between the separation portions of the heat radiation fins where the connecting pins 20, 20 are disposed). The length in the vertical direction is set to a length from the upper end of the metal plate constituting the mounting plate 2 or the vicinity thereof to the vicinity of the lower end portion of the housing body 3.

  At the upper ends of the guide protrusions 21 a and 21 b, a suspension receiving portion 9 is provided that suspends and holds the electrical housing 1 on the mounting plate 2 by engaging with the connecting pin 20.

  The suspension receiving portion 9 is configured to have a shape for supporting the connecting pin 20 from below, and in this embodiment, as shown in FIG. 6, the upper end portions of the guide protrusions 21a and 21b. It is made into the form of the recessed part 26 formed by notching the upper end side of this to a substantially U shape. The recessed portion 26 is provided at the same height in the left and right guide protrusions 21a and 21b, and when the connecting pins 20 and 20 are engaged with the recessed portions 26 and 26, the electrical component is provided. The housing 1 is configured so that the left and right heights can be held at the same position, that is, horizontally.

  Thus, in the grid-connected inverter device configured as described above, a procedure for attaching the electrical housing 1 to the wall surface will be described.

  When mounting the electrical housing 1, first, the mounting plate 2 is fixed at a predetermined mounting position on the wall surface. This fixing is performed by screwing through the long holes 24 and 24 provided in the mounting plate 2.

  When the mounting plate 2 is fixed to the wall surface, next, the rear upper end portion of the electrical housing 1 is leaned against the mounting plate 2 while aligning the left and right positions of the electrical housing 1 with the mounting plate 2 (see FIG. 7). At this time, the connecting pins 20, 20 on the back surface of the housing body 3 come into contact with the tips of the guide ridges 21 a, 21 b erected from the mounting plate 2 (sides on the front side of the guide ridges 21 a, 21 b). Like that. In other words, the spacing portions of the radiation fins 6a, 6b and 6a ′, 6b ′ over which the connecting pins 20, 20 are bridged on the back surface of the housing body 3 are fitted to the guide protrusions 21a, 21b of the mounting plate 2. (See FIG. 8).

  When the electrical housing 1 is leaned on the mounting plate 2 in this manner, the electrical housing 1 is then pushed upward from this state, and the suspension engaging portion 8 of the electrical housing 1 is attached to the mounting plate. 2 is engaged with the suspension receiving part 9 (see FIG. 9). That is, the electrical housing 1 leaning on the mounting plate 2 is slid along the guide protrusions 21a and 21b of the mounting plate 2 upward in the length direction. As a result, the connecting pins 20 and 20 move upward while following the tips of the guide protrusions 21a and 21b. When the connection pins 20 and 20 exceed the upper end corners of the guide protrusions 21a and 21b, the connection pins 20 and 20 fall to the wall surface and 26 (see FIG. 10).

  Therefore, by loosening the force that pushes up the electrical housing 1 at this time, the suspension receiving portion 9 causes the suspension engaging portion 8, that is, the electrical housing 1 provided with the suspension engagement portion 8 to move. The electrical housing 1 is suspended and held by the mounting plate 2. In this state, since the lower end portion of the electrical housing 1 is not yet fixed to the mounting plate 2, the electrical housing 1 is temporarily fixed.

  The grid interconnection inverter device of the present invention is suitable for performing wiring connection work to the junction box 4 in this temporarily fixed state. That is, in the temporarily fixed state, the electrical housing 1 swings (rotates) to the front side in the range indicated by the arrow in FIG. 11 with the connecting pins 20 and 20 at the upper end thereof as the swing fulcrum. ) Is held in a possible state. Therefore, in the grid-connected inverter device of the present invention, a work space can be created between the wall surface and the junction box 4 by rotating the electrical housing 1 in a temporarily fixed state. Therefore, for example, even when the operation of passing the wiring drawn out from the hole provided in the wall surface to which the electrical housing 1 and the mounting plate 2 are attached through the wiring insertion portion 41 on the back of the junction box is performed. A sufficient working space can be secured behind the rear surface, and rear construction can be easily performed. At this time, since the terminals 40 in the junction box 4 are exposed by removing the decorative plate 5 (see FIG. 11), the connection work can be performed while visually recognizing the terminals 40 in the junction box 4.

  When the wiring connection operation in the temporarily fixed state is completed, the main fixing of the electrical housing 1 in the temporarily fixed state, that is, the lower region (for example, the junction box 4) of the electrical housing 1 is fixed to the mounting plate 2. . This fixing is performed by fixing the junction box 4 to the joining flange portion 22 of the mounting plate 2 that is in contact with the back surface of the junction box 4 (see FIG. 12).

  As described above, according to the present invention, the guide rib portions 21a and 21b extending in the vertical direction of the mounting plate 2 fixed to the wall surface are fitted with the spacing portions of the rib portions provided on the back surface of the electrical housing 1. In addition, in this state, the electrical housing 1 is slid upward in the length direction of the guide ridges 21a and 21b, so that the suspension housing 9 provided on the guide ridges 21a and 21b has an electrical housing. 1, the electrical housing 1 is suspended and held by the mounting plate 2, so that the left and right positioning of the electrical housing 1 can be performed at a low position. Work can be done easily. In addition, the engagement of the suspension engaging portion 8 with the suspension receiving portion 9 can be performed with the upper end portion of the electrical housing 1 being leaned against the mounting plate 2, so that the electrical housing 1 can be lifted. This requires less labor, and the mounting of the electrical housing 1 is also easy in this respect.

  The above-described embodiments show preferred embodiments of the present invention, and the present invention is not limited to these, and various design changes can be made within the scope of the invention.

  For example, in the above-described embodiment, the DC-DC converter circuit unit 31, the series-parallel circuit unit 32, the DC-AC inverter circuit unit 33, and the filter circuit unit 34 are arranged in the casing body 3 clockwise from the lower left. Although the case where they are arranged is shown, the arrangement of each of these circuit units can be changed as appropriate. For example, they may be arranged counterclockwise from the lower right. In that case, the arrangement positions of the insulating transformers 35a, 35b, 35c, 35d and the AC reactors 36a, 36b are also opposite to those in FIG.

  In the above-described embodiment, the case where the main radiator is disposed on both the left and right side surfaces of the housing body 3 and the auxiliary radiator is disposed on the back surface of the housing body 3 has been described. In addition to being able to omit the vessel, it may be provided on the front surface instead of the back surface of the housing body 3, or in addition to this, may be provided on the ceiling surface.

DESCRIPTION OF SYMBOLS 1 Electrical component case 2 Mounting plate 3 Case main body 4 Junction box 5 Decorative door 6 Radiation fin (projection part)
7 Display part 8 Hanging engagement part 9 Hanging receiving part 11 Front panel 12a, 12b Side panel 13 Back panel 14 Top panel 15 Bottom panel 20 Connecting pin (connecting member)
21a, 21b Guide protrusion 22 Joint flange 23 Wall joint 26 Concave part (suspending receiving part)
31 DC-DC converter circuit unit 32 Series-parallel circuit unit 33 DC-AC inverter circuit unit 34 Filter circuit units 35a to 35d Insulating transformers 36a, 36b AC reactor

Claims (6)

In the electrical housing device that houses the grid-connected inverter having the converter circuit portion and the inverter circuit portion,
A radiator is provided on each of the left and right sides of the casing body that houses the circuit portion of the grid-connected inverter,
A grid interconnection characterized in that a heat generating component of the converter circuit unit is disposed adjacent to the side surface of the casing including one radiator and a heat generating component of the inverter circuit unit is disposed adjacent to the side surface of the casing including the other radiator. Inverter device. A circuit board on which other components of the converter circuit unit are mounted is disposed in the vicinity of the heat generating component of the converter circuit unit,
2. The grid-connected inverter device according to claim 1, wherein a circuit board on which other parts of the inverter circuit unit are mounted is disposed in the vicinity of the heat generating component of the inverter circuit unit.   3. The grid-connected inverter device according to claim 1, wherein the heat generating component of the converter circuit unit includes at least an insulating transformer, and the heat generating component of the inverter circuit unit includes at least an AC reactor.   4. The grid-connected inverter device according to claim 1, wherein each of the one radiator and the other radiator is formed integrally with a side surface of the housing. 5.   5. The grid-connected inverter device according to claim 1, wherein the housing body is a natural air-cooled housing that does not include an opening for ventilation.   The grid-connected inverter device according to any one of claims 1 to 5, wherein a thin radiator is provided on a front surface or a back surface of the housing body.

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