JP6478321B2 - Switchboard with air conditioner - Google Patents

Description

  The present invention relates to a switchboard having a conversion unit that converts a current from a power generation unit outside the panel casing from direct current to alternating current and / or from alternating current to direct current, and an air conditioner capable of delivering cooled air.

Conventionally, a casing is partitioned into a first chamber and a second chamber by a partition wall, an evaporator is accommodated in the first chamber, a condenser is accommodated in the second chamber, and the evaporator is accommodated through a conduit. Then, the refrigerant is circulated by pumping the refrigerant to the condenser by the compressor, the air taken in from the board is cooled by the evaporator, and the cooling air is provided in the board from the first chamber provided facing the board. A heat-resistant panel cooler that blows air is known (see Patent Document 1).
In this heat-resistant panel cooler, an electrical component including a control circuit for controlling the heat-resistant panel cooler is disposed in the first chamber, and an operation unit for operating the electrical component provided in the first chamber. Is exposed to the outside air side.

JP 2001-227875 A

However, in Patent Document 1, the position where the heat-resistant panel cooler is provided in the panel is not related to the equipment in the panel, and depending on the position provided, there is a possibility that cooling is not possible.
Furthermore, the cooler for a heat-resistant panel of Patent Document 1 is a panel that is located above the position where the warm air Aw is taken in, and that is cooler than the warm air Aw along the substantially horizontal direction (or at an angle from the substantially vertical direction). It is intended to send the cold air Ac as far as possible by sending it in, but in reality, the path of the cold air Ac (cold air vortex, etc.) in the panel is fixed and near the center of the cold air vortex On the contrary, there are places where the temperature does not drop in the panel or the cooling efficiency is poor.

  In view of such a point, the present invention is provided with an air intake port below the exhaust port of the conversion unit, and an air conditioner that sends cold air substantially vertically downward above the air intake port, and a protrusion at the bottom. It is an object of the present invention to provide a switchboard that can simultaneously realize “reliable cooling of the conversion unit” and “improvement of cooling efficiency” by having a bumping air conditioner or the like.

The first feature of the switchboard according to the present invention is that the conversion unit 3 converts the current from the power generation unit T outside the panel housing 2 from DC to AC and / or from AC to DC inside the panel housing 2. The conversion unit 3 is provided with an exhaust port 4 for exhausting the air inside the conversion unit 3 at the top thereof, and at the same time, the conversion unit 3 has an air flow into the conversion unit 3 below the exhaust port 4. An intake port 5 for inhaling air is provided, and a protrusion 7 is provided inside the panel housing 2 and above the intake port 5 so that cooled air can be sent from the lower surface and protrudes outward from the lower part. The point is that it has a butt air conditioner 6 '.

The second feature of the switchboard according to the present invention is that, in addition to the first feature, a plurality of air conditioners 6 capable of delivering cooled air inside the panel casing 2 and above the intake port 5 are provided. A predetermined number of the plurality of air conditioners 6 is a bump air conditioner 6 ′ provided with the protruding body 7, and the bump air conditioner 6 ′ It is in the point arrange | positioned in the position far from the said conversion part 3 from the non-impingement air conditioner 6 '' in which the said protrusion 7 is not provided.

The third feature of the switchboard according to the present invention is that the conversion unit 3 converts the current from the power generation unit T outside the panel housing 2 into DC from AC and / or from AC to DC inside the panel housing 2. The conversion unit 3 is provided with an exhaust port 4 for exhausting the air inside the conversion unit 3 at the top thereof, and at the same time, the conversion unit 3 has an air flow into the conversion unit 3 below the exhaust port 4. And a plurality of air conditioners 6 capable of delivering cooled air inside the panel housing 2 and above the air inlets 5. Even when a predetermined number of them are stopped, the air sucked from the intake port 5 of the conversion unit 3 is set to a predetermined temperature or less.

A fourth feature of the switchboard according to the present invention is that, in addition to any of the first to third features, the air conditioner includes an evaporator and a condenser.

With these features, an exhaust port 4 is provided at the top of the conversion unit 3, an intake port 5 is provided below the exhaust port 4, and cooled air (cold air R) can be sent above the intake port 5. By having the air conditioner 6, the conversion unit 3 in the panel housing 2 can be reliably cooled (“reliable cooling of the conversion unit 3”).
In addition to this, the air conditioner 6 sends the cold air R downward along the substantially vertical direction, so that the cold air R is sent into the panel at an angle from the substantially vertical direction as in Patent Document 1. Compared to the case, the place where the temperature does not drop in the panel housing 2 (such as the vicinity of the center of the vortex of the cold air R) is less likely to occur, and the cold air R spreads uniformly in the panel housing 2 and has a simple structure The cooling efficiency in the housing 2 (the switchboard 1) is increased ("improving cooling efficiency").

The “air conditioner” in the present invention is capable of delivering cooled air, and is also referred to as “cooler” or “air conditioner”. In addition to the cooled air, heating ( In addition to heated air, dehumidified air, particularly air that has not been subjected to anything (that is, air blowing) is also included.
In the present invention, “cooled air can be sent downward along a substantially vertical direction” means that the air conditioner 6 can send at least cooled air downward along a substantially vertical direction. This includes the case of sending along other directions.

  In addition to providing an intake port 5 below the exhaust port 4 at the top of the conversion unit 3 and having an air conditioner 6 above the intake port 5, in order to “reliably cool the conversion unit 3”, By making the air conditioner 6 a bumped air conditioner 6 ′ that can send out the cold air R from the lower surface and provided with a projecting body 7 at the lower part, the inside of the panel housing 2 is located above the projecting body 7 as a boundary. Divided into a high temperature space and a low temperature space below, the cool air R sent from the lower surface is easily sucked into the conversion unit 3 from the intake port 5 and has a simple structure to the panel housing 2 (the switchboard 1). Increases cooling efficiency ("Improves cooling efficiency").

  Furthermore, by disposing the impulsive air conditioner 6 'at a position farther from the conversion unit 3 than the non-advanced air conditioner 6 "," reliable cooling of the conversion unit 3 "and" improvement of cooling efficiency "are realized simultaneously However, it is possible to reduce the rush air conditioner 6 ′ provided with the projecting body 7 as much as possible, which leads to a reduction in equipment burden.

  In addition to providing an intake port 5 below the exhaust port 4 at the top of the conversion unit 3 and having a plurality of air conditioners 6 above the intake port 5, in order to “reliably cool the conversion unit 3”. Even when a predetermined number of these air conditioners 6 are stopped, even if some of the air conditioners 6 are stopped by setting the air sucked from the intake port 5 of the converter 3 to a predetermined temperature or less. Thus, it becomes an environment in which the conversion by the conversion unit 3 can be continued, and a switchboard that can cope with changes in the natural environment and accidents can be realized.

  In addition, by incorporating an evaporator and a condenser in the air conditioners 6, 6 ′, 6 ″, an outdoor unit and piping connecting the outdoor unit and the air conditioner 6 become unnecessary, and space is saved in the switchboard 1. The burden of installing outdoor units and piping can be reduced.

  According to the switchboard according to the present invention, an air inlet is provided below the air outlet of the conversion unit, and an air conditioner that sends out the cooled air substantially vertically downward from the air inlet, and a protrusion at the bottom. By having a bumping air conditioner, etc., “reliable cooling of the converter” and “improvement of cooling efficiency” can be realized simultaneously with a simple structure.

It is a perspective view which shows the internal structure of the switchboard which concerns on this invention, Comprising: (a) is a diagonal front perspective view, (b) is a diagonal back perspective view. It is the schematic diagram which showed the sending direction of the air conditioner in the inside of a switchboard (panel housing | casing) about Test 1, (a) is the schematic diagram which also had the air conditioner sent at an angle from the substantially vertical direction. (B) is a schematic diagram having only an air conditioner sent downward along a substantially vertical direction. It is the schematic diagram which showed the air path also including the cool air sent out at an angle from the substantially vertical direction inside the board case about Test 1, and (a) is the wind speed distribution which looked at the inside of the board case from the front. (B) is a plan sectional view of the panel housing, (c) is a wind speed distribution diagram in the AA ′ section of (b), and (d) is BB ′ of (b). It is a wind speed distribution map in a section (section near the inlet). It is the schematic diagram which showed the air path containing only the cold air sent out along the substantially vertical direction inside the panel housing | casing about Test 1, (a) is the wind speed which looked at the inside of the panel housing from the front It is a distribution diagram, (b) is a plan sectional view of the panel housing, (c) is a wind speed distribution diagram in the CC 'section of (b), (d) is a DD of (b). It is a wind speed distribution diagram in a 'cross section (cross section near the intake port). It is a perspective view which shows the internal structure of a switchboard, Comprising: (a) is an oblique front perspective view which shows the case where all the air conditioners do not have a protrusion, (b) is an air conditioner in front of a current collection part. FIG. 4C is an oblique front perspective view showing a case where the air conditioner has a protrusion, and FIG. 5C is an oblique front perspective view showing a case where the air conditioner in front of the current collector and the high voltage part has a protrusion. FIG. 4 is a front perspective view showing a high temperature space and a low temperature space inside the switchboard (panel housing). It is a wind speed distribution figure which looked at the inside of a panel case when all the air conditioners do not have a projection about Test 2, and (a) is cold air sent out from all the air conditioners (coolers) FIG. 4B is a wind speed distribution diagram of a case in which one of the air conditioners (coolers) is stopped. It is a wind speed distribution figure which looked at the inside of the panel case from the front in case the air conditioner in front of a current collection part has a projection object about test 2, and (a) is cold air from all the air conditioners (coolers). FIG. 4B is a wind speed distribution diagram of a case in which is sent, and FIG. 5B is a wind speed distribution diagram of a case where any one of the air conditioners (coolers) is stopped. FIG. 9 is a wind speed distribution diagram of the inside of the panel housing when the air conditioner in front of the current collector and the high voltage section has a protrusion for Test 2, and (a) shows all the air conditioners (coolers) (B) is a wind speed distribution diagram of a case in which one of the air conditioners (coolers) is stopped. All air conditioners do not have protrusions, air conditioners in front of current collectors have protrusions, air conditioners in front of current collectors and high voltage parts have protrusions, It is the graph which showed the temperature of the air of the inlet of the conversion part in the case where the cold air is sent out from the air conditioner (cooler) and the case where one of the air conditioners (cooler) is stopped. (A) is a schematic diagram which shows the solar power generation system using the switchboard which concerns on this invention, (b) is a schematic diagram which shows arrangement | positioning of a switchboard and a solar cell.

Embodiments of the present invention will be described below with reference to the drawings.
<Overall configuration of switchboard 1>
1 to 10 show a switchboard 1 according to the present invention.
The switchboard 1 includes a conversion unit 3 that converts a current from a power generation unit T outside the panel casing 2 into DC and AC and / or AC to DC, and cooled air ( It has an air conditioner 6 capable of delivering cold air R).
In addition to the converter 3 and the air conditioner 6, the switchboard 1 includes a current collector 11 that collects a direct current from outside the panel housing 2 (such as the solar cell T), and the converter described above via the current collector 11. A transformer 12 that converts the low-voltage alternating current converted by the section 3 into a higher-voltage high-voltage alternating current, and a high-voltage section 13 that transmits the high-voltage alternating current from the transformer 12 to the outside of the panel housing 2 (the distribution network N described later). And an uninterruptible power supply (UPS) 14, the above-described conversion unit 3, air conditioner 6, UPS 14, and the like that supply current to the UPS 15.

Here, in the case of the solar power generation system 100 described later, the solar cell T supplies the direct current from the outside of the panel housing 2 to the conversion unit 3 of the switchboard 1. However, the wind power, hydraulic power, wave power, etc. This is the current from the rotating generator (motor).
If the output current from the motor is an alternating current, the converter 3 may include both a converter device that converts alternating current to direct current and an inverter device that converts this direct current to alternating current. In the case of direct current, the conversion unit 3 only needs to include an inverter device, but the following describes a case where a direct current flows into the conversion unit 3 as in the solar cell T.

<Board case 2>
As shown in FIGS. 1 to 8 and 10, the panel housing 2 is formed in a substantially rectangular parallelepiped shape, and partitions and supports the current collecting unit 11, the converting unit 3, the high voltage unit 13, and the like therein. It is reinforced with a support member.
The panel housing 2 may be provided with an openable / closable door on the front surface 2a, and the panel housing 2 may have a transformer 12 attached to the side outer surface (that is, The transformer 12 may be provided outside the panel housing 2).

<Conversion unit 3>
As shown in FIGS. 1 to 8 and 10, the conversion unit 3 may be provided anywhere in the panel housing 2. positioned.
The conversion unit 3 includes an inverter device that converts a direct current from the solar cell T into a low-voltage alternating current (100 to 200 V, etc.), a control unit that controls the AC voltage and frequency that the inverter device converts, and an air shut-off A machine (ACB) or the like may be provided.
These inverter device, control unit, circuit breaker, and the like are disposed in the conversion housing 3a.

<Exhaust port 4 and intake port 5>
As shown in FIG. 1, the exhaust port 4 discharges air inside the conversion unit 3 (conversion housing 3 a), and is provided on the upper portion of the conversion unit 3 (conversion housing 3 a). .
The exhaust port 4 may be provided with a rotating fan that allows the air inside the conversion housing 3a to escape upward.

The intake port 5 sucks air into the conversion unit 3 (conversion housing 3a), and is provided below the exhaust port 4 in the conversion unit 3 (conversion housing 3a).
The intake port 5 may be provided in any of the conversion housings 3a as long as it is below the exhaust ports 4, but, for example, the front side of the conversion housing 3a (the near side (in other words, FIG. 1A) For example, the user of the switchboard 1 may be provided in the panel space 16 side) which is movable in the panel housing 2).

<Air conditioner 6>
As shown in FIGS. 1 to 8, the air conditioner 6 sends out the cooled air (cold air R) into the panel housing 2 along a predetermined direction. It is provided above the intake port 5 of the conversion unit 3 described above.
The air conditioner 6 may have any configuration as long as it can send out the cool air R. As described above, in addition to the cool air R, the air that has been heated (heated), dehumidified air, and in particular, nothing. You may send out the air which has not been given (namely, ventilation).

Further, a plurality of air conditioners 6 may be provided inside one panel housing 2.
The position (installation position) where the air conditioner 6 is provided may be anywhere as long as it is above the intake port 5 of the conversion unit 3, and the number of installed units is not particularly limited. Four units may be provided on the left and right upper parts of the body 2 and on the front side (above the above-mentioned space 16 in the panel).

Further, the air conditioner 6 may include an evaporator and a condenser. In this case, an outdoor unit and piping connecting the outdoor unit and the air conditioner 6 are not required, and space saving in the switchboard 1 is achieved. This reduces the burden of installing outdoor units and piping.
Of course, the air conditioner 6 may be an outdoor unit or a pipe.

The air conditioner 6 includes an air conditioning housing 6a that contains at least the above-described evaporator. The air conditioning housing 6a may have any shape, but has a substantially rectangular parallelepiped shape, for example.
On the side surface (or top surface) of the air conditioner 6 (air conditioning housing 6a), a suction port 6b for sucking air in the panel housing 2 is provided.
The air conditioner 6 (air conditioning housing 6a) is also provided with a delivery port (blower port) 6c that sends out the cool air R that has cooled the air sucked from the suction port 6b. The position of may be good.

As the air conditioner 6 of the present invention, for example, as described above, the direction in which the cool air R is sent may be such that at least the cool air R can be sent downward along the substantially vertical direction.
As described above, the air conditioner 6 in this case may be capable of being sent along a direction other than the substantially vertical direction, and may be switched to any of the delivery directions including the downward direction along the substantially vertical direction. It does not matter.
In this case, the outlet 6c of the air conditioner 6 described above may be at any position as long as at least the cold air R can be sent downward along the substantially vertical direction. It is provided on the lower surface.

<Bump Air Conditioner 6 '/ Non-Bump Air Conditioner 6 ">
The air conditioner 6 of the present invention may be, for example, a bumped air conditioner 6 ′ provided with a projecting body 7 capable of delivering the cold air R from the lower surface and projecting outward from the lower portion of the air conditioning housing 6a.
An air conditioner not provided with such a projecting body 7 is referred to as a non-impact air conditioner 6 ″.
In the following, the protrusion 7 will be described in particular.

<Projecting body 7>
As shown in FIGS. 1-8, if the protrusion 7 has the part protruded outward from the lower part, plate-shaped thing, a flange-like thing, and the plate-like body which is another body will be an air-conditioning housing | casing. The thickness (size), shape, etc. of the projecting body 7 such as the one attached to the lower surface of 6a may be any configuration.
In addition, when the plate-shaped body which is a separate body is attached to the lower surface of the air conditioning housing 6a, if there is the outlet 6c on the lower surface of the air conditioning housing 6a, naturally there is no problem in sending from the outlet 6c. Thus, an opening is provided in a separate plate-like body.

Further, the protruding direction of the protruding body 7 is not particularly limited, and may be any direction such as a direction along a substantially horizontal direction or a direction inclined from a substantially horizontal direction.
By providing such a projecting body 7 at the lower part of the air conditioner 6 (air-conditioning housing 6a), the inside of the panel housing 2 has a high temperature space above and a lower temperature with the projecting body 7 as a boundary. The cooling air R divided into low spaces is easily sucked into the conversion unit 3 from the intake port 5 through the lower surface, and the cooling efficiency in the panel housing 2 (the switchboard 1) is increased with a simple structure ("cooling efficiency" Improvement ").
In addition, the height position in the panel housing | casing 2 of the protrusion body 7 is substantially the same as the height position in the panel housing | casing 2 of the exhaust port 4 of the conversion part 3 (refer FIG. 2, FIG.5 (d)). .
The following describes the above-described members that may be provided inside the panel housing 2 of the switchboard 1.

Any one of the air conditioners 6, 6 ′, 6 ″ and the like described so far can be provided with one air conditioner 6 that can send the cold air R downward in a substantially vertical direction within the panel housing 2 of the switchboard 1. By also having a stand, compared to the case where the cool air R is fed into the panel along the substantially horizontal direction as in Patent Document 1, the sent cool air R becomes a cold air that is directed downward. It reaches the floor surface in the housing 2. Since the cold air R hitting the floor surface in the panel housing 2 changes the direction of travel by 180 °, the delivery speed of the cold air R is reduced, and the intake port 5 of the conversion unit 3 is reduced. It becomes easy to be sucked into.
Therefore, the air in the panel housing 2 is randomly mixed, and it is difficult to generate a place where the temperature does not decrease in the panel housing 2 such as near the center of the vortex of the cold air R. By having at least one air conditioner 6 that can be sent downward, the cooling efficiency in the panel housing 2 (the switchboard 1) is increased with a simple structure ("improving the cooling efficiency").

<Current collector 11>
As shown in FIGS. 1 to 8 and 10, the current collector 11 may be provided anywhere in the panel housing 2, for example, the right part ( It is located in the left part in FIG.
In the current collector 11, a plurality of breakers arranged in the vertical direction may be arranged in a pair of left and right. In this case, a direct current from a solar cell T through a junction box Z described later is passed through each breaker. A DC cable 11a is connected from the lower left of the panel housing 2 to the rear of each breaker 11b.

<Transformer 12>
As shown in FIG. 10, the transformer 12 is a so-called transformer, and a low-voltage AC current (100 to 200 V or the like) from the conversion unit 3 is converted into a high-voltage AC current (6600 V or 22000 V or the like) suitable for power transmission. Transform to
The transformer 12 may be provided regardless of the inside or the outside of the panel casing 2, but may be attached to the right outer surface of the panel casing 2, for example.

The transformer 12 includes a substantially rectangular parallelepiped main body, a plurality of radiating fins erected from three outer surfaces of the main body excluding the panel housing 2 side, and a substantially rectangular parallelepiped connection cover provided on the upper surface thereof. May be.
In addition, when it has a connection cover, the connection part (connection terminal) of the cable (low voltage cable, high voltage cable, etc.) from the panel housing | casing 2 and the transformer 12 is covered by this connection cover.

<High pressure part 13>
As shown in FIGS. 1 to 8 and 10, the high-pressure unit 13 may be provided anywhere in the panel housing 2. For example, the left portion (see FIG. 1 (a) left part).
The high voltage unit 13 may include a vacuum circuit breaker (VCB), a lightning arrester (SAR), and the like, and can transmit a high voltage AC current from the transformer 12 to the outside of the panel housing 2 (the power distribution network N described later). Any configuration is acceptable.

<UPS14, auxiliary machine 15>
As shown in FIG. 10, the UPS 14 and the auxiliary machine 15 are disposed below the high-pressure unit 13.
The UPS 14 is a device that supplies electricity to each part for a while even at the time of a power failure. The auxiliary machine 15 includes an auxiliary machine transformer and a circuit breaker, a conversion unit 3 (control power supply, fan power supply), an air conditioner 6. , Supply power to the UPS 14, lighting in the panel housing 2, outlet, and the like.

<Test 1>
As shown in FIGS. 2 to 4, in Test 1, the air conditioner sending direction inside the switchboard (panel housing) also includes an air conditioner that sends an angle from the <1> substantially vertical direction. And <2> the case of having only an air conditioner sent downward along a substantially vertical direction was compared.
In Test 1 and Test 2 to be described later, it is assumed that the switchboard 1 is provided with four air conditioners 6 (referred to as “coolers 6” in Tests 1 and 2 because the cool air R is sent out). These four air conditioners 6 are a front view of the switchboard 1 ("cooler 1", "cooler 2", "cooler 3", "cooler in FIGS. 2 to 4 and 6 to 8 etc. from the left). 4 ”(in other words, the cooler 1 is“ the cooler before the current collector 11 ”, the coolers 2 and 3 are“ the cooler near the converter 3 ”, and the cooler 4 is“ the cooler before the high pressure unit 13 ”. It can be said to be a “machine”).

FIG. 2 (a) shows the case of having an air conditioner that is sent at an angle from the <1> substantially vertical direction. In more detail, the delivery direction of the coolers 1 and 4 is set to the substantially vertical direction. An angle of approximately 45 ° is formed from the downward direction along the center of the left and right sides, and the coolers 2 and 3 send out the cold air R downward along the substantially vertical direction.
FIG. 2B shows the case of having only the air conditioner sent out downward along the <2> substantially vertical direction. However, in detail, all of the coolers 1 to 4 are in the substantially vertical direction. The cold air R is sent downward along the line.

<Evaluation of Test 1>
As shown in FIG. 3, in the case of including a cooler (air conditioner) 6 that sends a cool air R at an angle of approximately 45 ° toward the center of <1>, all the sent cool air R is once centered. Although it gathers at (right and left center), since it intersects in the vicinity of the left and right center, the cold air R eventually turns to the left and right direction outward direction.
As a result, the path (wind path) of the cold air R is limited, a vortex of the cold air R is generated, air is stagnated at the center of the vortex, and the temperature difference of the space in the panel housing 2 increases.

On the other hand, as shown in FIG. 4, when all the coolers (air conditioners) 6 of <2> are sent downward along the substantially vertical direction, all of the sent cool air R becomes downward cold air. Therefore, it reaches uniformly to the floor surface in the panel housing 2.
The cool air R that hits the floor surface in the panel housing 2 changes its traveling direction by 180 °, so that the delivery speed of the cool air R becomes slow and is easily sucked into the intake port 5 of the conversion unit 3.
That is, by providing only the air conditioner 6 that can send the cold air R downward in the substantially vertical direction in the panel housing 2 of the switchboard 1, the cold air R spreads more uniformly in the panel housing 2, With a simple structure, the cooling efficiency in the panel housing 2 (the switchboard 1) is further increased (further improvement in cooling efficiency).

<Test 2>
As shown in FIGS. 5 to 9, in the test 2, the inside of the panel casing 2 has a plurality of air conditioners depending on the position where the air conditioner 6 having the protrusion 7 (that is, the bump air conditioner 6 ′) is provided. Whether or not it is an environment where conversion by the conversion unit 3 can be continued even when a predetermined number of the machines 6 are stopped (whether the air sucked from the intake port 5 of the conversion unit 3 is below a predetermined temperature) Evaluation was performed.
In Test 2, it was determined whether the environment in which the conversion by the conversion unit 3 can be continued is whether the air sucked from the intake port 5 is 35 ° C. or less. It is not limited to ° C., and a judgment temperature is used according to the capacity inside the switchboard 1 (panel housing 2), the performance of the equipment such as the conversion unit 3 in the panel housing 2, and the like.

FIG. 5 (a) shows that <A> a bumper air conditioner (bump cooler) 6 'is not provided at all, but all normal air conditioners (coolers), that is, non-pump air conditioners (non-pump coolers). ) 6 ″.
FIG. 5B shows a <B> bumping air conditioner (bumping cooler) 6 ′ provided only in front of the current collector 11, and the rest are all non-bumping air conditioners (non-bumping cooler) 6. "Is shown.
FIG. 5C shows a <C> bump air conditioner (bump cooler) 6 ′ provided only in front of the current collector 11 and the high voltage section 13, and the rest are all non-pump air conditioners (non-push). In this case, the cooling unit is 6 ″.

FIG. 5D shows a state in which the inside of the panel housing 2 is divided into a space having a high temperature above and a space having a low temperature below, but the space having a high temperature and the space having a low temperature are bumped. It can also be said that the air conditioner 6 'is separated from the projecting body 7 as a boundary. Further, each of FIGS. 6 to 8B shows a state in the vicinity of the intake port 5 of the conversion unit 3.
Tables 1 to 3 and FIGS. 6 to 9 below show the case where the cooling units 1 to 4 are all turned on in the case of <A> to <C> described above (when the number of operating units is four), and cooling. When only one of the machines 1 to 4 is turned off (when the number of operating units is 3), the result of measuring the temperature of the air (intake port temperature) near the intake port 5 of the conversion unit 3 (maximum value) (Max), minimum value (Min), average value (Ave)).

<Evaluation of Test 2>
As shown in Tables 1 to 3 and FIGS. 6 to 9, in the case of all non-impact coolers 6 ″ in <A>, even if any one of the coolers 1 to 4 is turned off, If the average (Ave) of the inlet temperature exceeds the judgment temperature of 35 ° C. and all the coolers 1 to 4 are not operated, an environment in which conversion by the conversion unit 3 can be performed is not achieved.
Next, in the case where only the current collector 11 in front of <B> is the impingement cooler 6 ', the number of operating units is only when the cooler 4 in front of the high pressure unit 13 is turned off among the coolers 1 to 4. In spite of the three units, the average inlet temperature (Ave) is 35 ° C. or lower, and the conversion unit 3 can perform conversion. However, if the cooling unit 4 other than the cooler 4 is turned off, the average inlet temperature (Ave) exceeds 35 ° C., and it does not become an environment where the conversion by the conversion unit 3 can be continued.
Finally, in the case where only the front of the current collector 11 and the front of the high pressure unit 13 of <C> are the impingement coolers 6 ′, the average of the inlet temperature ( Even if Ave) is 35 ° C. or lower and the number of operating units is 3, an environment in which conversion by the conversion unit 3 can be performed can be maintained.

Therefore, by having at least one bumping air conditioner 6 ′ provided with the projecting body 7, the inside of the panel housing 2 has a higher upper temperature space and a lower lower temperature with the projecting body 7 as a boundary. The cooling air R divided from the lower surface is easily sucked into the conversion unit 3 from the intake port 5 and the cooling efficiency in the panel housing 2 (the switchboard 1) is increased with a simple structure (“cooling efficiency Improvement ").
At the same time, a bump air conditioner 6 ′ is disposed at a position far from the conversion unit 3 having the exhaust port 4 and the intake port 5, such as in front of the current collecting unit 11 and the high pressure unit 13, and close to the conversion unit 3. By disposing the non-impact air conditioner 6 ″, the impulsive air conditioner 6 ′ provided with the projecting body 7 is achieved while simultaneously realizing “reliable cooling of the conversion unit 3” and “improvement of cooling efficiency”. Can be reduced as much as possible, leading to a reduction in equipment burden.

<Solar power generation system 100>
FIG. 10 shows a photovoltaic power generation system 100 using the switchboard 1 according to the present invention.
This solar power generation system 100 includes a large number of solar cells T, a plurality of junction boxes Z (with a circuit breaker or the like) that conduct with a predetermined number of the numerous solar cells T, and all of the plurality of junction boxes Z. It has a distribution board 1 that conducts, a distribution cable K that conducts the distribution board N and a distribution network N that terminates in a distribution pole, and a watt-hour meter that measures the amount of power flowing through the distribution cable K. This watt-hour meter is provided not only when selling power to the distribution network N but also when purchasing power from the distribution network N.
The solar cell T is tilted so as to become lower toward the south, and the angle may be any number as long as a sufficient power generation amount can be obtained, for example, 5 degrees.

Further, the solar cells T may be arranged according to the size and shape of the land to be installed. For example, a total of 84 solar cells T of 6 stages × 14 rows are connected to one junction box Z, If 30 sets are installed, 2520 may be installed approximately 85m from north to south x approximately 70m from east to west (see Fig. 10 (b)). If the amount of power generation per solar cell T is 250W, standard The solar cell array output is nominally 630 kW.
As another arrangement, a total of 168 solar cells T of 4 stages × 42 rows are connected to one junction box Z, and the same 2520 pieces are installed, or a total of 168 pieces of 6 stages × 28 rows is installed. 15 sets of solar cells T connected to one junction box Z are collected on one switchboard 1, and four switchboards 1 are installed to provide 1,080 solar cells T (standard solar cell array output is nominally (2520 kW by value) may be arranged.
In addition, the solar cell T and the connection box Z are divided into 15 sets north and south, and the switchboard 1 is installed in the center between them (to make the length of the DC cable 11a uniform and shorten). Moreover, since the switchboard 1 arrange | positions a door toward the north, the rear outer surface (back outer surface) of the panel housing | casing 2 faces south, and the left outer surface which attached the transformer 12 faces west.

<Heat shielding>
As shown in FIG. 1, the switchboard 1 used in the above-described photovoltaic power generation system 100 is provided with a thermal barrier coating on the outer surface of the ceiling of the switchboard 1, or a rear outer surface (back outer surface) facing south and facing west. A heat shield plate 17 may be attached to the upper left outer surface (the upper part of the transformer 12) via a support.
Further, a thermal barrier coating may be applied to the upper left outer surface of the switchboard 1.

<Others>
The present invention is not limited to the embodiment described above. Each structure of the switchboard 1 etc. or the whole structure, shape, dimension, etc. can be suitably changed along the meaning of the present invention.
The switchboard 1 can also be used when an alternating current is allowed to flow, such as wind power generation, in addition to solar power generation.
The switchboard 1 may have a built-in storage battery. If there is a surplus in the amount of power generation such as solar power generation, the storage battery is charged. If the amount of power generation is reduced (cloudy, rainy or at night), the storage battery The amount of electricity used by each house (customer) may be covered by the electric power from.

  The switchboard according to the present invention can be used in a plant 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 Switchboard 2 Panel housing 3 Conversion part 4 Exhaust port of conversion part 5 Intake port of conversion part 6 Air conditioner 6 'Impact air conditioner 6 "Non-impact air conditioner 7 Projection body T Power generation part

Claims (4)

A switchboard having a conversion section (3) for converting the current from the power generation section (T) outside the panel casing (2) from DC to AC and / or from AC to DC inside the panel casing (2) Because
The conversion unit (3) is provided with an exhaust port (4) for discharging the air inside the conversion unit (3) at the upper portion thereof, and at the same time, the conversion unit (3) is disposed below the exhaust port (4). An intake port (5) for inhaling air is provided,
A butt air conditioner provided with a projecting body (7) that is capable of delivering cooled air from the lower surface and projecting outward from the lower portion inside the panel casing (2) and above the intake port (5) (6 ') The switchboard characterized by having. There are a plurality of air conditioners (6) capable of delivering cooled air inside the panel casing (2) and above the intake port (5), and among the plurality of air conditioners (6) The predetermined number is an impingement air conditioner (6 ′) provided with the protrusion (7),
The impingement air conditioner (6 ′) is separated from the conversion unit (3) by the non-impact air conditioner (6 ″) in which the protrusion (7) is not provided in the panel casing (2). The switchboard according to claim 1 , wherein the switchboard is disposed at a distant position. A switchboard having a conversion section (3) for converting the current from the power generation section (T) outside the panel casing (2) from DC to AC and / or from AC to DC inside the panel casing (2) Because
The conversion unit (3) is provided with an exhaust port (4) for discharging the air inside the conversion unit (3) at the upper portion thereof, and at the same time, the conversion unit (3) is disposed below the exhaust port (4). An intake port (5) for inhaling air is provided,
A plurality of air conditioners (6) capable of delivering cooled air inside the panel casing (2) and above the intake port (5);
Even if a predetermined number of these air conditioners (6) are stopped, the distribution board is characterized in that the air sucked from the air inlet (5) of the converter (3) is set to a predetermined temperature or less. The switchboard according to any one of claims 1 to 3 , wherein the air conditioner includes an evaporator and a condenser.