JP6238355B2 - 1000V junction box - Google Patents

Description

  The present invention relates to a box body that houses an electric device, and a box box (junction box or the like) that has a rotatable box door that opens and closes an opening on the front surface of the box body and is used in a photovoltaic power plant or the like. .

Conventionally, a connection box for solar power generation in which a backflow prevention diode, a DC switch, and the like are incorporated in a case is known (see Patent Document 1).
In this connection box for photovoltaic power generation, on the case back plate in the case, a female screw body for screwing the board on which the switch is assembled is projected and the backflow prevention diode is assembled. A flat portion for closely adhering the heat dissipating plate, and the heat dissipating plate includes a plurality of engaging portions engaged with the female screw body, and has a flat back surface in a state where the backflow prevention diode is assembled. The board attached on the case back plate via the screw body and the heat radiating plate arranged on the flat portion in a state of being engaged with the female screw body have an overlapping area, and the overlapping area of the board is appropriately determined. A pressing portion that presses the heat radiating plate against the case back plate is formed at the site, and the heat radiating plate is brought into close contact with the case back plate by screwing the substrate to the female screw body.

JP 2012-243867 A

However, in the connection box for photovoltaic power generation described in Patent Document 1, the terminal block is exposed just by screwing and mounting the terminal block on the board immediately next to the DC switch (Patent Document). 1 and 2).
In the terminal block thus exposed, the user may come into contact with the terminal when performing the opening / closing operation. Due to this possibility, the voltage collected at the terminal block cannot be increased.

  In view of the above, the present invention provides a circuit breaker closer to the opening of the box body than the current collector, and covers the terminal portion of the current collector with the circuit breaker. An object of the present invention is to provide a storage box capable of collecting high voltage by eliminating the possibility of contact with the battery.

  A storage box 1 according to the present invention is a storage box having a box main body 3 that stores an electric device 2 and a rotatable box door 4 that opens and closes an opening 3 a on the front surface of the box main body 3. 2 includes a current collector 5 that collects power from a plurality of power supply devices D outside the storage box via a terminal portion 5a, and a circuit breaker 6 that can cut off transmission of the power collected by the current collector 5. The first feature is that the circuit breaker 6 is disposed closer to the opening 3a of the box body 3 than the current collector 5, and the terminal portion 5a of the current collector 5 is covered with the circuit breaker 6 in front view.

  In addition to the first feature, the second feature of the storage box 1 according to the present invention is fixed above the opening 3a of the box body 3 and via a rotating shaft body 7 extending in a substantially horizontal direction. The box door 4 is rotatably attached, and the box body 3 is formed in a substantially rectangular parallelepiped shape having a bottom with an opening 3a on the front surface thereof and having a substantially horizontal length longer than a substantially vertical length. In addition, a backflow prevention diode 8 for preventing a backflow of power from the power supply device D is provided on the inner surface side of the upper surface member 35 of the box body 3.

  A third feature of the storage box 1 according to the present invention is that, in addition to the second feature, a cover body 9 that covers at least the front side and the lower side of the backflow prevention diode 8 on the upper surface member 35 of the box body 3. It is in the point which is arranged.

With these features, the circuit breaker 6 is disposed closer to the opening 3a of the box body 3 than the current collector 5, and the terminal portion 5a of the current collector 5 is covered with the circuit breaker 6 when viewed from the front. When the user performs a shut-off operation or the like without exposing the terminal portion 5a, the user can be prevented from coming into contact with the terminal portion 5a of the current collector 5, and the voltage to be collected can be increased. ("High current collection voltage").
In addition to this, by disposing the circuit breaker 6 closer to the opening 3a of the box body 3 than the current collector 5, as in the connection box for photovoltaic power generation of Patent Document 1, a DC switch, Each electrical device such as a backflow prevention diode is disposed on the rear side of the substrate or the like (that is, the space from each device to the back of the door is not used (FIGS. 3 and 4 of Patent Document 1)). ), The space in the storage box 1 can be used without waste ("improvement of space utilization efficiency"), and at the same time, the rear member 34 and the like are not unnecessarily large ("reduced size of rear member / box door"). ).

In the present invention, “front and rear” means that the opening 3a side of the box body 3 is “front”, and the side away from the opening 3a is “rear”.
In the present invention, “up and down” means that the direction in which the object falls (side closer to the earth) when the storage box 1 is installed is “down”, and the direction opposite to the direction in which the object falls (side away from the earth) ) Is "up".
Further, “left and right” in the present invention means that the left hand side when the box body 3 is turned from “rear” to “front” is “left” and the right hand side when it is turned from “rear” to “front”. “Right”.

Further, the box door 4 is opened upward, and the backflow prevention diode 8 is provided on the inner surface side of the upper surface member 35 of the horizontally long, substantially rectangular parallelepiped box body 3, so that even if the backflow prevention diode 8 is heated, the storage box 1 In the inside, the heat remains in the vicinity of the upper surface member 35, and it is possible to suppress the heat from being transmitted to other electric devices 2 such as the current collector 5 and the circuit breaker 6 located below the upper surface member 35.
In addition to this, even if the backflow prevention diode 8 is heated and the upper surface member 35 becomes hot, when the user approaches, the upper surface member 35 is positioned on the farther side of the box door 4 that is opened upward. In addition, the possibility of touching by the user can be reduced.

  Furthermore, by providing the cover body 9 that covers the backflow prevention diode 8, the user can touch the upper surface member 35 and the backflow prevention diode 8 from the inner surface side even when the user performs a shut-off operation or the like. Can be further reduced.

  According to the storage box according to the present invention, the circuit breaker is arranged closer to the opening of the box body than the current collector, and the terminal part of the current collector is covered with the circuit breaker, so that the user can contact the terminal part during the breaking operation. This makes it possible to achieve “higher current collection voltage” and at the same time realize “improvement of space utilization efficiency”.

It is a side view which shows the storage box which concerns on this invention. It is a perspective view which shows a storage box. It is a front view (front view) which shows the storage box which opened the box door. It is a front view (front view) which shows the state which exposed the collector accommodated in a storage box. It is a perspective view which shows the vertical plate body and left and right horizontal plate body of a storage box. It is a top view which shows the vertical plate body and left and right horizontal plate body of a storage box. It is a perspective view which shows the inner bottom face and sealing surface (lower peripheral surface) of a box main body. It is a schematic diagram which shows the solar power generation plant using a storage box.

Embodiments of the present invention will be described below with reference to the drawings.
<Overall configuration>
As shown in FIGS. 1 to 8, the storage box 1 according to the present invention is a box body that stores the electric device 2.
The electric equipment 2 housed in the housing box 1 may be equipment used in the solar power plant P. For example, the power generated by the solar cells in the solar power plant P is collected for each predetermined number, and the switchboard H It is also possible to use a device for transmitting power to the power distribution board or a device for transmitting power from a generator such as a motor rotated by wind power, hydraulic power, wave power, etc. to the switchboard.
Therefore, taking the above-described photovoltaic power plant P as an example, the power supply device D outside the storage box 1 will be described below.

<Power supply device D (solar power plant P)>
As shown in FIG. 8, the power supply device D corresponds to a solar cell in the photovoltaic power plant P, and a plurality (for example, 5 to 20) of power supply devices (solar cells) D are connected in series. Connected to form the solar cell string S.
Each solar cell D generates direct-current power between the positive electrode (+ electrode) and the negative electrode (−electrode) when irradiated with light, and the average generated power is about 100 to 300 W (for example, 250 W). ).
The shape of the solar cell D is not particularly limited, but may be, for example, a panel shape.

Since the solar cell strings S to which such solar cells D are connected are connected in parallel to the connection box for each of a plurality (for example, 5 to 20), the power output terminals ( The voltage between the + pole) and the ground end (− pole) is the same, and is about 0.5 to 6 kW as described above.
If the storage box 1 of the present invention is a photovoltaic power plant P, it corresponds to the connection box described above.

Since the current of a plurality of solar cell strings S flows into one storage box (connection box) 1, the power collected in this connection box 1 is about 2.5 to 150 kW (for example, in the connection box 1). If the 6 solar cell strings S with an output power of 3.5 kW are connected, 21 kW, 42 kW if 12 cells are connected, and 5 solar cell strings S with an output power of 21 kW are connected. If so, it is 105 kW).
Here, in the case of the junction box 1 with an output power of 105 kW, for example, if the flowing current is 100 A, a high voltage of 1000 V or more is applied to the current collector 5 in the junction box 1.

Further, each solar cell string S is connected to the junction box 1 via a backflow prevention diode 8 described later.
Such a connection box 1 transmits the power collected from each solar cell D (solar cell string S) to the switchboard H. The distribution board H is connected to a distribution network G having a utility pole or the like as a terminal via a distribution cable K.
A plurality of (for example, 10 to 40) connection boxes 1 are connected to one switchboard H.

The switchboard H may have any configuration as long as the DC current from the solar cell D can be converted into an AC current. For example, the switchboard H1 and the connection box 1 (solar cell outside the panel casing H1). D) current collector H2 that collects the direct current from D, a converter (power conditioner (power conditioner, PCS)) H3 that converts the direct current that has passed through the current collector H2 into a low alternating current, and a low current from the power conditioner H3. Transformer H4 that converts alternating current into higher-voltage, high alternating current, and power transmission unit (transmission panel) H5 that transmits the high alternating current from this transformer H4 to the distribution network G etc. outside the panel housing H1 doing.
Moreover, the switchboard H may have a pyranometer for measuring the solar radiation intensity, a temperature sensor for measuring the air temperature, and an auxiliary device for supplying a current to the power conditioner H3, the pyranometer, the temperature sensor, etc. Illuminometer, temperature sensor, and auxiliary equipment are not shown).
The shape and configuration of the storage box 1 used as a connection box in the solar power generation plant P that also includes the switchboard H described above will be described in detail below.

<Container box 1, electrical equipment 2>
As shown in FIGS. 1 to 7, the storage box 1 includes a box body 3 that houses the electrical device 2 and a rotatable box door 4 that opens and closes an opening 3 a on the front surface of the box body 3.
Further, the storage box 1 includes a rotation shaft body 7 that rotatably attaches the box door 4 to the box body 3, lock means 21 that holds the opening 3 a of the box body 3 closed by the box door 4, and the box body. When the opening 3a of 3 is opened, a support tool 22 that supports the open state of the box door 4 is also provided.

The electrical equipment 2 housed in the housing box 1 includes a current collector 5 that collects power from a plurality of power supply devices D outside the housing box 1, and a shutoff that can shut off transmission of power collected by the current collector 5. A container 6 is included.
The electrical equipment 2 housed in the housing box 1 includes a backflow prevention diode 8, a switch 23 that can open and close the power from each power supply device D, and a lightning arrester 24 that releases a surge voltage caused by a lightning strike. It doesn't matter.
The electrical device 2 may include any machine / equipment in addition to the current collector 5, the circuit breaker 6, and the backflow prevention diode 8, for example, a fuse, a relay (relay), a cable (wiring cord), a connector, etc. It may be an electric device such as an electronic device such as a sensor (ammeter, voltmeter) or a CPU.

<Box body 3>
As shown in FIGS. 1 to 7, the box body 3 is formed in a substantially rectangular parallelepiped shape. The front surface of the box body 3 has an opening 3 a, and the rear surface side of the box body 3 is closed. It is formed in a bottom shape (a bottomed substantially rectangular parallelepiped shape having an opening 3a on the front surface).
The box body 3 has three plates, a vertical plate 31, a left horizontal plate 32A, and a right horizontal plate 32B. Any joining means (joining method) may be used as long as the box body 3 can be formed by bending the vertical plate body 31 and the left and right horizontal plate bodies 32A and 32B at predetermined positions and angles and joining them together. However, the vertical plate 31 and the left and right horizontal plates 32A and 32B are joined to each other, for example, by welding.
The shape of the box body 3 is formed so that the length in the left-right direction (substantially horizontal direction) is longer than the length in the vertical direction (substantially vertical direction).

The box body 3 may be made of any material, but the material may be, for example, iron, stainless steel such as SUS304 or SUS430, or carbon steel.
In the case of stainless steel such as SUS304, surface treatment such as 2B or BA may be performed.

<Vertical plate body 31>
As shown in FIGS. 5 and 6, the vertical plate 31 constitutes a lower surface member 33, a rear surface member 34, and an upper surface member 35 of the box body 3 by bending a substantially rectangular plate body into a predetermined shape. Is.
Further, the vertical plate 31 also forms a fixing piece 36 extending from the left and right end portions of the portion constituting the rear member 34.

The fixing piece 36 has a fixing hole 36 a through which fixing means such as a bolt is passed, and a gripping hole 36 b that can be gripped when the storage box 1 is carried.
Note that cable holes 37 penetrating the lower surface member 33 are respectively provided in midway portions in the vertical direction (front-rear direction) of the left and right end portions of the lower surface member 33.

<Left horizontal plate body 32A, Right horizontal plate body 32B>
As shown in FIGS. 5 and 6, the left horizontal plate body 32 </ b> A constitutes the left surface member (that is, the left surface member 32 </ b> A) of the box body 3 by bending a substantially rectangular plate body into a predetermined shape.
Further, the right horizontal plate body 32B constitutes the right surface member (that is, the right surface member 32B) of the box body 3 by bending a substantially rectangular plate body into a predetermined shape.

<Seal surface 38>
As shown in FIGS. 1-3 and 5-7, the seal surface 38 is formed in the position surrounding the opening 3a of the box main body 3 front surface.
The sealing surface 38 abuts on the rear surface side of the box door 4, so that the storage box 1 is sealed to prevent (suppress) rain or dust from entering from the outside.

<Box door 4>
As shown in FIGS. 1-7, the box door 4 closes the opening 3a of the box main body 3, Comprising: As for the shape of the box door 4, the length of the left-right direction (substantially horizontal direction) is the up-down direction (substantially). It is formed in a landscape shape longer than the length in the vertical direction).
The length of the box door 4 in the substantially vertical direction is longer than the length of the box body 3 in the substantially vertical direction. When the opening 3 a of the box body 3 is closed, the box door 4 has a lower end edge on the front surface of the box body 3. Located below the lower edge.

The box door 4 has side plates 4a to 4d with respect to the door plate 4A. The side doors 4a to 4d can be bent at a predetermined position and angle and joined together to form the box door 4. In this case, any joining means (joining method) may be used, but for example, welding or the like may be used.
The box door 4 may also be made of any material, but the material may be, for example, iron, stainless steel such as SUS304 or SUS430, or carbon steel, like the box body 3. .
In the case of stainless steel, surface treatment such as 2B may be performed.

The front face of the box door 4 (door plate 4A) is substantially flush.
Therefore, unlike a case where a member (lever or the like) to be gripped on the front surface of the door or a member to be locked is provided, and a member such as a spacer is necessary, even when transporting a plurality of storage boxes 1, It can be stacked and transported easily.
Further, when the container 1 is transported, the gripping hole 36b of the fixed piece 36 described above is gripped, so that the transport is further facilitated.

On the back surface of the door plate 4 </ b> A of the box door 4, a seal member 39 that contacts the above-described seal surface 38 is provided.
The seal member 39 is provided at a substantially rectangular position corresponding to the seal surface 38 when the opening 3 a of the box body 3 is closed by the box door 4.
The seal member 39 may be made of any material as long as it contacts the seal surface 38 and prevents rain or the like from entering the storage box 1. For example, natural rubber, silicon rubber, Teflon (registered) (Trademark) resin, organic materials such as urethane foam (urethane foam), and inorganic materials such as leather and ceramics may be used.

<Rotating shaft 7>
As shown in FIGS. 1 to 3, 5, and 7, the rotation shaft body 7 is configured to rotatably attach the box door 4 to the box body 3. It is fixed above the opening 3a.
The shaft center of the rotating shaft body 7 is disposed so as to extend in a substantially horizontal direction, whereby the box door 4 is opened upward.

The rotating shaft body 7 may have any configuration as long as it is fixed above the opening 3a of the box body 3, but may be a hinge or a hinge member, for example.
Further, the mounting position of the rotating shaft body 7 is provided such that the maximum opening angle of the box door 4 with respect to the opening 3a (seal surface 38) of the box body 3 is 90 degrees or more (for example, 100 degrees). It does not matter.

<Locking means 21>
As shown in FIGS. 1 to 3, the lock means (lock member) 21 holds the box door 4 with the opening 3 a closed with respect to the box body 3, One is provided on each side.
The lock means 21 may have any configuration as long as it holds the box door 4 with the opening 3a of the box body 3 closed, but may be a catch clip, for example.
Thus, since the lock means 21 is provided on the left and right side surfaces of the box body 3 and the box door 4, there is no need to provide a gripping member or a locking member on the front surface of the box door 4. It can be kept in one shape and contributes to improved transport efficiency.

Note that locking means may be provided on at least one of the right and left sides of the locking means 21.
The lock means 21 may be made of any material as long as the above-described configuration can be realized. Examples of the material include iron, stainless steel such as SUS304 and SUS430, and carbon steel. It may be. In the case of stainless steel, surface treatment such as 2B may be performed.

<Supporting tool 22>
As shown in FIGS. 1 to 3 and 7, the support 22 supports the box door 4 with the opening 3 a of the box body 3 opened, and the opening 3 a of the box body 3 and the box door 4 are supported. It is provided in the upper part of the left-right one side in the rear surface.
The support 22 may have any configuration as long as it supports the box door 4 with the opening 3a of the box body 3 open, but may be a stay, for example.
The support tool 22 (stay) is provided with a stopper mechanism that holds the state extended by a predetermined length. When the support tool 22 is held at a predetermined length by the stopper mechanism, the box door 4 (door plate 4A). And the upper surface of the upper surface member 35 of the box main body 3 are substantially horizontal and substantially horizontal (the opening angle of the box door 4 with respect to the opening 3a of the box main body 3 is approximately 90 degrees). A support tool 22 is disposed so as to be in a single shape.

The stopper mechanism is released by lifting the box door 4 above substantially horizontal (so that the opening angle of the box door 4 with respect to the opening 3a of the box body 3 is greater than about 90 degrees). Is done.
The support 22 may be made of any material as long as the above-described configuration can be realized. Examples of the material include iron, stainless steel such as SUS304 and SUS430, and carbon steel. It may be. In the case of stainless steel, surface treatment such as 2B may be performed.

  Up to this point, the storage box 1 has been explained in detail. From now on, each electric device 2 in the storage box 1 will be described along the flow of electricity (see FIG. 8).

<Switch 23>
As shown in FIGS. 1 to 4 and 8, the switch 23 is an electric device that opens and closes (ON / OFF) the electric circuit from each power supply device D.
In the case of the above-described photovoltaic power plant P, one switch 23 is provided for each of the solar cell strings S to which the power supply device (solar cell) D is directly connected.

The switch 23 has a connecting portion (opening / closing connecting portion) 23a for connecting a cord (conductive wire) from the power supply device D and a cord to a backflow prevention diode 8 described later.
In the open / close connection portion 23a, the side connecting the cord (conductor) from the power supply device D is the power source side (primary side), and the side connecting the cord to the backflow prevention diode 8 is the load side (secondary side). .
About the switching connection part 23a, a voltage is lower than the terminal part 5a of the collector 5 which connects all the solar cell strings S in series.
In addition, although the arrangement | positioning position of the switch 23 is provided in the rear surface member 34 side, as long as it is the inside of the storage box 1, it may be any.

<Backflow prevention diode 8>
In the backflow prevention diode 8 shown in FIGS. 1 to 3 and 8, the positive pole of each solar cell string S is connected via the backflow prevention diode 8.
This is to prevent a current from flowing back to the solar cell string S having a lower potential than the other when a potential difference occurs between the solar cell strings S connected to the connection box 1.
The backflow prevention diode 8 has an anode (anode) connected to the positive electrode of the solar cell string S and a cathode (cathode) connected to the connection box 1 side.

In the case of the photovoltaic power plant P, the backflow prevention diodes 8 are also provided one by one for each of the solar cell strings S. As the members, two backflow prevention diodes 8 are combined into one. It may be a thing.
Each of the backflow prevention diodes 8 may be disposed in any of the storage boxes 1, but may be provided on the inner surface side of the upper surface member 35 of the box body 3.

As a result, even if the backflow prevention diode 8 is heated, the heat remains in the vicinity of the upper surface member 35 in the storage box 1, and other electric devices such as the current collector 5 and the circuit breaker 6 located below the upper surface member 35. Heat can be prevented from being transmitted to 2.
Even if the backflow prevention diode 8 is heated and the upper surface member 35 is heated, when the user approaches, the upper surface member 35 is located on the further back side of the box door 4 that is opened upward. The possibility of touching the person can be reduced.

<Cover body 9>
1 to 3, the cover body 9 covers the backflow prevention diode 8 and may have any shape as long as it can cover the backflow prevention diode 8. It may be a horizontally long plate (step plate 9) having two steps.
With such a step plate 9, a single plate can cover a plurality of backflow prevention diodes 8, and one plate on both sides of the step is for fixing the inner surface of the upper surface member 35 of the box body 3. The step itself can cover the front side of each backflow prevention diode 8, and the other plate on either side of the step can cover the front side of each backflow prevention diode 8.
Also, it is only necessary to fix the fixing plate piece to the upper surface member 35.

The cover body 9 may be made of any material, but the material may be a resin such as acrylic, engineering plastics such as polycarbonate, polyamide, polyacetal, polybutylene terephthalate.
Further, if the cover body 9 is formed of a transparent resin, the backflow prevention diode 8 can be visually recognized even if the cover body 9 is covered.

The cover body 9 can further reduce the possibility that the user touches the upper surface member 35 and the backflow prevention diode 8 from the inner surface side even when the user is performing a blocking operation or the like.
The cover body 9 may have a shape that covers not only the front side and the lower side of the backflow prevention diode 8, but also the rear side.

<Current collector 5>
As shown in FIGS. 1 to 3 and 8, the current collector 5 is an electric device that collects electric power from a plurality of power supply devices (solar cells) D existing outside the connection box 1.
The current collector 5 collects electric power from each power supply device D via a terminal portion (current collection terminal portion) 5a, and this terminal portion 5a is connected to a cord (from each power supply device D (solar cell string S)) ( Directly, this is a portion that connects the core material at the tip of the cord extending through the switch 23 and the backflow prevention diode 8 and the core material at the tip of the cord to the circuit breaker 6 so as to be conductive.

Accordingly, the terminal portion 5a of the current collector 5 refers to both the cord from each power supply device D and the core material at the tip of the cord to the circuit breaker 6 and the metal fittings connecting these core materials, and is made conductive. In this case, it is necessary to make the exposed core material and the metal fitting directly contact each other.
The terminal 5a of the current collector 5 also has a power supply side (primary side) as a side to which the cord from the power supply device D is connected, and a load side (secondary side) as a side to which the cord to the circuit breaker 6 is connected. On the secondary side, the voltages of all the power supply devices D (solar cell strings S) are connected in series, and the voltage is clearly higher than that of the switching connection portion 23a of the switch 23 described above.
In addition, the current collector 5 having such a high voltage is not an electric device that requires operation after the installation box 1 is installed, such as the above-described switch 23 and circuit breaker 6 described later. Since many cords from the power supply device D (solar cell string S) are collected, there are many terminal portions 5a that the user should not touch during energization. Furthermore, since the current collector 5 is only when the number of power supply devices D (solar cell strings S) is changed (normally, once installed, there is almost no change in the number etc.), the frequency of touching by the user ( The possibility of user contact) is low.

Therefore, the current collector 5 is provided on the rear surface member 34 side of the box body 3, that is, on the side farthest from the opening 3 a of the box body 3.
The current collector 5 is not particularly limited in its configuration. For example, a terminal block for fastening the core material exposed from the end of the cord to the metal fitting with a screw, or a spring lock (spring clan) type metal fitting for easy fixing of the cord. It may be a terminal block.

Hereinafter, the case where the current collector 5 is a spring lock type terminal block will be described.
The current collector 5 includes a power output terminal block 5A connected to the power output terminal (+ pole) from the backflow prevention diode 8 and a ground terminal board 5B connected to the ground terminal (−pole) from the switch 23. It has as a pair.
The pair of power output terminal block 5A and the ground terminal block 5B have the same shape and configuration, but may be color-coded such that red and blue can be distinguished at a glance.

Each terminal block 5A, 5B is gathered from the power supply side (primary side) connection portion 11 (11A, 11B) for connecting the cord from the power supply device D (solar cell string S) and each connected cord. The load side (secondary side) connection part 12 (12A, 12B) which connects the code | cord | chord which collects the electric power collected and output to the shield 6 mentioned later is provided.
Each terminal block 5A, 5B is provided with a load side connection portion 12 at each end of one power supply side connection portion 11, and the power supply side connection portion 11 and each load side connection portion 12 are electrically connected. (For example, commoning via a jumper).

That is, the current collector 5 collects the power collected by connecting all the cords of the power output terminal (+ pole) and the ground terminal (− pole) to one power supply side connection section 11, and collects the power collected by the two load side connection sections. 12 is divided and output.
As a result, even if a high voltage is applied to the conductive portion (for example, a jumper) inside the power supply side connection portion 11 and each load side connection portion 12, the load side connection portion 12 actually divides the current into two currents. Therefore, the allowable power increases.
In addition, the collected power is described later via the power output end (+ pole) cord and the ground end (− pole) cord connected to the load side connection portion 12 in each of the terminal blocks 5A and 5B. Connected to the circuit breaker 6.
Further, the cord output to the shield 6 may not be divided in this way.

<Circuit breaker 6>
As shown in FIGS. 1 to 3 and 8, the circuit breaker 6 is an electric device capable of interrupting the transmission of power collected by the current collector 5.
In the case of the above-described photovoltaic power plant P, only one circuit breaker 6 is normally provided for one storage box 1 regardless of the number of power supply devices (solar cells) D. In addition, the number of the circuit breakers 6 with respect to one storage box 1 is not specifically limited.

The circuit breaker 6 is also connected to the cord from the current collector 5 (the cord at the power output end (+ pole) and the cord at the ground end (− pole)) and the cord to the switchboard H described above (breaking connection portion). 6a.
In the cut-off connecting portion 6a, the side to which the cord from the current collector 5 is connected is the power source side (primary side), and the side to which the cord to the switchboard H is connected is the load side (secondary side).

The number of cutoff connection portions 6a is much smaller than the number of terminal portions 5a of the current collector 5 in which the cords from all the power supply devices D (solar cell strings S) are collected. The possibility of touching by the user can be eliminated.
Therefore, it can be said that the position of the circuit breaker 6 is not particularly limited as long as the circuit breaker 6 is disposed inside the housing box 1. However, in the present invention, the circuit breaker 6 uses the pedestal 13, which will be described later, from the current collector 5. The main body 3 is provided on the side close to the opening 3a.

The pedestal 13 may have any configuration as long as the circuit breaker 6 is provided closer to the opening 3a of the box body 3 than the current collector 5, for example, a plate bent in a substantially U-shape or the like in a side view. The body may be used.
Therefore, the following describes a case where the pedestal 13 is a bent plate.

The pedestal 13 is composed of a single plate, and this plate includes a substantially rectangular support plate 13a that supports the circuit breaker 6, and leg portions 13b that extend from four corners of the support plate 13a. The mounting piece 13c is formed by bending the tip of each leg 13b.
The direction in which each leg portion 13b extends with respect to the support plate 13a is also a substantially rectangular vertical direction of the support plate 13a (a direction along one set of sides facing each other on the four sides of the substantially rectangular shape). It may be in the horizontal direction (the direction along another set of sides facing each other on the four sides of the substantially rectangular shape), and the extending direction of each leg portion 13b depends on the arrangement of the other electrical devices 2 in the storage box 1.・ The side may be mixed.

With respect to the support plate 13a, all four leg portions 13b are bent in the same direction on the front surface or the back surface, and the bending angle is approximately 90 °.
By bending in this way, it can be said that the support plate 13a and each leg portion 13b are substantially U-shaped in a side view.

For each leg portion 13b, each attachment piece 13c is bent in either the outer side or the inner side (the outer and inner sides are also bent depending on the arrangement of the other electric devices 2 in the storage box 1). The bending angle is also approximately 90 °.
By bending in this way, it can be said that the leg portion 13b and the attachment piece 13c are substantially L-shaped in a side view.

The pedestal 13 formed by bending in this way is covered so as to cover the above-described current collector 5 from the front side (upper side), and is attached to the rear surface member 34 side of the box body 3 via the respective attachment pieces 13 c of the pedestal 13. It is done.
The circuit breaker 6 is fixed to the front side (upper side) of the support plate 13a of the attached base 13.
That is, the circuit breaker 6 is disposed closer to the opening 3a of the box body 3 than the current collector 5, and the terminal portion 5a of the current collector 5 is covered with the circuit breaker 6 when viewed from the front.
FIG. 4 is a view showing a state where the base 13 of the circuit breaker 6 is intentionally removed and the current collector 5 is exposed.

Thus, by arranging the circuit breaker 6 closer to the opening 3a of the box body 3 than the current collector 5, the terminal portion 5a of the current collector 5 is covered with the circuit breaker 6 in front view, When the shut-off operation is performed without exposing the terminal portion 5a, the possibility that the user may contact the terminal portion 5a of the current collector 5 can be eliminated, and the increase in the collected voltage can be avoided. It can be realized ("high current collection voltage").
In addition to this, by disposing the circuit breaker 6 closer to the opening 3a of the box body 3 than the current collector 5, as in the connection box for photovoltaic power generation of Patent Document 1, a DC switch, Each electrical device such as a backflow prevention diode is disposed on the rear side of the substrate or the like (that is, the space from each device to the back of the door is not used (FIGS. 3 and 4 of Patent Document 1)). ), The space in the storage box 1 can be used without waste ("improvement of space utilization efficiency"), and at the same time, the rear member 34 and the like are not unnecessarily large ("reduced size of rear member / box door"). ).

<Lightning Arrestor 24>
As shown in FIGS. 2 to 4 and 8, the lightning arrester 24 is an electric device that releases a surge voltage caused by a lightning strike.
The lightning arrester 24 is electrically branched and connected between the current collector 5 and the circuit breaker 6. In the case of the solar power generation plant P described above, regardless of the number of power supply devices (solar cells) D, Usually, only one container box 1 is provided. The number of lightning arresters 24 for one storage box 1 is not particularly limited.

The lightning arrester 24 also has a connecting portion (lightning arresting connection portion) 24a for connecting the cord from the current collector 5 and the cord to the circuit breaker 6 described above.
In the lightning protection connection part 24a, the side to which the cord from the current collector 5 is connected is the power source side (primary side), and the side to which the cord to the switchboard H is connected is the load side (secondary side).

The number of lightning protection connection parts 24a is very small compared to the number of terminal parts 5a of the current collector 5 as in the case of the interruption connection parts 6a of the circuit breaker 6, and the user only needs to cover this small number of lightning protection connection parts 24a. The possibility of touching can be eliminated.
The lightning arrester 24 is disposed on the rear member 34 side, but may be any position as long as it is inside the storage box 1.

<Others>
The present invention is not limited to the embodiment described above. Each configuration of the storage box 1 or the like, or the overall structure, shape, dimensions, and the like can be appropriately changed in accordance with the spirit of the present invention.
Inside the box body 3, the electric device 2 may be attached to the front surface of the rear member 34 or the lower surface of the upper surface member 35 via the attachment plate 41.
If the box body 3 is formed in a bottomed substantially rectangular parallelepiped shape having an opening 3a on the front surface, the box body 3 does not necessarily have the vertical plate body 31 and the left and right horizontal plate bodies 32A and 32B. The member 33, the rear surface member 34, the upper surface member 35, the left surface member 32A, the right surface member 32B, and each fixing piece 36 may be configured as separate plates, or the left surface member 32A, the rear surface member 34, and the right surface member 32B may be formed as one plate. Each fixing piece 36, the lower surface member 33, and the upper surface member 35 may be configured by separate plates.

The vertical length of the box door 4 does not necessarily have to be longer than the vertical length of the box body 3, the lower end edge of the box door 4 is located below the lower end edge of the front surface of the box body 3, and the opening 3 a of the box body 3 As long as the box door 4 is closed, the height position of the upper end of the box door 4 may not necessarily coincide with the height position of the upper end of the box body 3.
The cover body 9 may not be provided.

The lock means 21 may be a padlock that holds the box body 3 and the box door 4 as long as it holds the box door 4 with the opening 3 a of the box body 3 closed.
As long as the support 22 supports the box door 4 with the opening 3a of the box body 3 open, the support 22 does not need to expand and contract, and may be a detachable rod-like body.
The power supply device D may have any configuration other than a solar battery as long as it can supply power (electric power) such as a generator (motor) rotated by wind power, hydraulic power, wave power, a dry battery, a storage battery, and the like. Also good. The current flowing from the power supply device D may be either a direct current or an alternating current.

  The storage box 1 can be used in a system that generates electric power by a generator (motor) rotated by wind power, hydraulic power, wave power, etc. in addition to a solar power generation plant, and can be used regardless of whether it is outdoors or indoors.

DESCRIPTION OF SYMBOLS 1 Storage box 2 Electric equipment 3 Box main body 3a Opening of box main body 4 Box door 5 Current collector 5a Current collector terminal part 6 Circuit breaker 7 Rotating shaft body 35 Upper surface member of box main body 8 Backflow prevention diode 9 Cover body D Power supply device

Claims (3)

A storage box having a box body (3) for storing an electric device (2) and a rotatable box door (4) for opening and closing an opening (3a) on the front surface of the box body (3);
The electric device (2) includes a current collector (5) that collects power from a plurality of power supply devices (D) outside the storage box via a terminal portion (5a), and power collected by the current collector (5). Including a circuit breaker (6) capable of interrupting power transmission of
This circuit breaker (6) is disposed closer to the opening (3a) of the box body (3) than the current collector (5), and the terminal part (5a) of the current collector (5) is viewed from the front when the circuit breaker (6 A storage box characterized in that it is covered. The box door (4) is pivotally attached via a pivot shaft (7) fixed above the opening (3a) of the box body (3) and extending in a substantially horizontal direction,
The box body (3) is formed in a substantially rectangular parallelepiped shape having a bottom with an opening (3a) on the front surface and a substantially horizontal length longer than a substantially vertical length,
The backflow prevention diode (8) which prevents the backflow of the electric power from the said power supply device (D) is provided in the inner surface side of the upper surface member (35) of the said box main body (3). The stated storage box.   The cover member (9) covering at least the front side and the lower side of the backflow prevention diode (8) is disposed on the upper surface member (35) of the box body (3). The stated storage box.

Images