JP6407018B2 - Heat dissipation structure in current collection box for solar power generation system - Google Patents

Description

  The present invention relates to a heat dissipation structure in a current collection box for a photovoltaic power generation system.

  In the current collection box for the solar power generation system, as shown in Patent Document 1, each solar cell string, that is, each solar cell module group in which solar cells are connected in series so that a necessary DC voltage can be obtained. Each branch switch is provided with a backflow prevention diode module connected to the positive electrode of the branch switch, and a current collecting switch for collecting them. These internal devices are fixed on the device mounting plate in the housing, but particularly heat generated from the backflow prevention diode module may impair the life of the peripheral devices. Therefore, this heat is radiated to the outside by bringing the device mounting plate into contact with the side surface of the casing.

  The branch switch is attached to the device mounting plate via a switch mounting portion, and a backflow prevention diode module is disposed above the branch switch. Therefore, there is a problem that a heat pool of the backflow prevention diode module accumulates in the upper part of the housing. In order to solve this problem, a structure in which the heat accumulation is eliminated by providing a convection promoting member such as a louver that promotes convection of air in the casing in the casing is generally used. However, the switch mounting part hinders convection, and there is a problem that the heat pool is not sufficiently eliminated.

JP 2013-149766 A

  An object of the present invention is to solve the above-described conventional problems and to provide a heat dissipation structure in a current collection box for a photovoltaic power generation system that can sufficiently eliminate heat accumulation around the periphery of a backflow prevention diode module.

In order to solve the above problems, the present invention provides a branch switch that opens and closes an electric circuit of a solar cell module on a device mounting plate provided in a housing, and a backflow prevention disposed above the branch switch. A solar module in which a diode module is disposed, a louver or a fan for introducing outside air into the housing is provided in the housing , and the branch switch is mounted on the device mounting plate via a switch mounting portion. A heat dissipation structure in a current collection box for a photovoltaic power generation system, wherein the switch mounting portion is bent toward the device mounting plate from a mounting portion on which the branch switch is mounted and both ends of the mounting portion. consisted of the arm portion, the the arm portion, der air flowing into the housing from the louvers or fan which is characterized in that the formation of the vent hole leading to the backflow prevention diode module .

  The invention according to claim 2 is the heat dissipation structure in the current collection box for the solar power generation system according to claim 1, wherein the backflow prevention diode module is provided on the same vertical line as the vent hole. It is.

  The invention according to claim 3 is the heat dissipation structure in the current collection box for the solar power generation system according to claim 1 or 2, wherein the switch mounting portion is substantially U-shaped in cross section, and the branch switch is mounted. A mounting portion and an arm portion bent in the direction of the device mounting plate from both ends of the mounting portion, and the vent hole is formed through both of the arm portions. It is what.

  According to a fourth aspect of the present invention, in the heat dissipation structure in the current collection box for the photovoltaic power generation system according to the third aspect, the bus bar to which the backflow prevention diode module or the wiring of the branch switch is connected is connected to the vent hole. It is characterized by being provided at a more forward position.

  According to a fifth aspect of the present invention, in the heat dissipation structure in the current collection box for the solar power generation system according to the first aspect, the backflow prevention diode module is mounted on the device mounting plate via a heat dissipation fin, and the heat dissipation The fin is provided on the same vertical line as the vent hole.

The heat dissipation structure in the current collection box for the photovoltaic power generation system according to the present invention includes a mounting portion on which the branch switch is mounted, and arm portions that are bent in the direction of the device mounting plate from both ends of the mounting portion. A vent hole for guiding the air flowing into the casing from the louver or fan to the backflow prevention diode module was formed in the switch mounting portion. As a result, the air flow in the housing is not hindered by the switch mounting portion and is guided to the upper backflow prevention diode module, so that the heat accumulation around the backflow prevention diode module can be sufficiently eliminated. . Further, by forming the vent hole, the switch mounting portion is reduced in weight, that is, the casing can be reduced in weight.

  According to the second aspect of the present invention, by providing the backflow prevention diode module on the same vertical line as the vent hole, it is possible to reliably guide the air flowing in by convection to the backflow prevention diode module.

  In the invention according to claim 3, the switch mounting portion has a substantially U-shaped cross section, the mounting portion on which the branch switch is mounted, and the arm portion bent in the direction of the device mounting plate from both ends of the mounting portion. In addition, the air holes were formed in both arm portions. Thereby, it is possible to guide the air flowing in by the convection in the vertical direction of the casing while supporting the branch switch by the switch mounting portion.

  In the invention according to claim 4, the bus bar to which the backflow prevention diode module or the branch switch wiring is connected is provided at a position ahead of the vent hole. Thereby, it can prevent that a bus-bar is obstructing convection.

  In the invention according to claim 5, the backflow prevention diode module is mounted on the device mounting plate via the heat radiation fin. Thereby, the heat radiation from the backflow prevention diode module can be more effectively promoted. Furthermore, by providing the heat radiation fins on the same vertical line as the vent holes, heat radiation from the heat radiation fins can be promoted.

It is a whole perspective view which shows 1st Embodiment. It is a front view which shows the in-casing machine of 1st Embodiment. It is a perspective view which shows the in-casing machine of 1st Embodiment. It is a side view which shows the in-casing machine of 1st Embodiment. It is a perspective view which shows the principal part of 1st Embodiment. It is a perspective view which shows the attachment structure of a radiation fin. It is a perspective view which shows 2nd Embodiment. It is a perspective view which shows 3rd Embodiment. It is a perspective view which shows 4th Embodiment. It is a perspective view which shows other embodiment.

  Preferred embodiments of the present invention are shown below. In addition, the up-down direction and the left-right direction refer to the directions shown in FIGS. Specifically, the vertical direction indicates the arrangement direction of the branch switch 4 and the backflow prevention diode module 5. The left-right direction indicates the arrangement direction of the plurality of branch switches 4.

(First embodiment)
As shown in FIG. 1, a current collection box for a photovoltaic power generation system includes a housing 1 and a door 2 attached to the front side of the housing 1. As shown in FIG. 2, inside the housing 1, as shown in FIG. 2, one device mounting plate 3 made of iron base, a branch switch 4 formed for each solar cell module group (not shown), and a branch switch 4 And a backflow prevention diode module 5 connected to the positive electrode. The branch switch 4 is arranged side by side in the left-right direction of the housing 1. Then, from the positive terminal 19 provided on the output side of the branch switch 4, the positive bar 7 connected through the backflow prevention diode module 5 by the positive lead bar 6 and also provided on the output side of the branch switch 4. A negative electrode bar 9 connected by a negative electrode lead bar 8 is provided from the negative electrode terminal portion 20 thus formed. Further, a current collecting switch (not shown) that collects these is provided outside the housing 1. In the present embodiment, the current collecting switch is connected to the current collecting switch by the current collecting cable 10. In addition, the input from the solar cell module group which is not shown in figure is connected to the input side terminal part 27 of the branch switch 4, respectively.

As shown in FIG. 1, a louver for introducing outside air into the housing is provided on the side surface of the housing 1 as a convection promoting member for promoting convection of air in the housing 1. In the present embodiment, the louver 11 as a convection promoting member is provided on the left side surface of the housing 1. Note that the louver 11 may be provided on the right side surface or both side surfaces of the housing 1, and the louver 11 is formed on the bottom surface of the housing 1 or the door portion 2. Even if it forms in the door part 2 and an exhaust surface is provided in the side surface of the housing | casing 1, it does not interfere.

  As shown in FIG. 3, the branch switch 4 is attached to the device mounting plate 3 via the switch mounting portion 12. The switch mounting portion 12 is formed with a vent hole 13 that guides air that has flowed in by convection urged by the louver 11 to the backflow prevention diode module 5. As shown in FIG. 4, the switch mounting portion 12 has a substantially U-shaped cross section. The switch mounting portion 14 on which the branch switch 4 is mounted and the both ends of the mounting portion 14 are substantially in the direction of the device mounting plate 3. The arm portion 15 was bent 90 degrees. The air holes 13 are formed so as to penetrate both the arm portions 15.

With the configuration as described above, convection is not hindered by the switch mounting portion 12 as in the prior art, and is led to the upper backflow prevention diode module 5, so that the heat pool around the backflow prevention diode module 5 is reduced. It can be solved sufficiently. Moreover, since the switch mounting part 12 is reduced in weight by forming the ventilation hole 13, the weight reduction of the housing | casing 1 can be achieved. Further, by forming the vent hole 13 in the arm portion 15, the air flowing into the housing from the louver can be guided in the vertical direction of the housing 1 while supporting the branch switch 4 by the switch mounting portion 12. It becomes possible.

  As shown in FIG. 3, the backflow prevention diode module 5 is provided on the same vertical line as the vent hole 13. As a result, the air flowing in by convection can be reliably guided to the backflow preventing diode module 5. The vent 13 is formed only in the arm portion 15 facing the backflow prevention diode module 5, and the air flowing from the left and right sides of the switch mounting portion 12 is guided to the backflow prevention diode module 5 through the vent hole 13. Things can be used.

  As shown in FIG. 5, a negative bar 9 of a bus bar is provided between the backflow prevention diode module 5 and the branch switch 4. And this negative electrode bar 9 shall be provided in the front position rather than the vent hole 13 by the bar holder 25, ie, the door 2 side. As a result, the presence of the negative electrode bar 9 can be prevented from interfering with convection.

  As shown in FIG. 6A, the backflow prevention diode module 5 is mounted on the device mounting plate 3 through heat radiation fins 17 having a plurality of standing fins 16. More specifically, the radiation fin attachment 18 having the radiation fins 17 therein is fixed to the device attachment plate 3, and the backflow prevention diode module 5 is attached to the front side of the radiation fin attachment 18. At this time, it is preferable to provide the radiation fins 17 on the same vertical line as the vent holes 13. Thereby, the heat radiation from the backflow prevention diode module 5 can be more effectively promoted, and at the same time, the heat radiation from the radiation fins 17 can be promoted. Note that it is preferable to dispose the heat radiation fins 16 so that at least the space between the standing fins 16 and 16 penetrates in the vertical direction, and heat can be radiated by convection of air in the vertical direction of the housing 1. Further, a pin fin structure in which a plurality of pins are erected to allow air to convect from the top, bottom, left, and right directions may be used. With such a pin fin structure, heat dissipation of the backflow prevention diode module 5 is more effectively performed by turbulent flow.

  As shown in FIG. 6B, the radiating fins 17 may be provided on the back side of the device mounting plate 3, and the other side of the radiating fins 17 may be brought into contact with the back plate of the housing 1. At this time, the backflow prevention diode module 5 is disposed on the same vertical line as the vent hole 13 as described above.

  As shown in FIG. 2, a gap extending in the vertical direction of the housing 1 is formed between a plurality of adjacent backflow prevention diode modules 5, 5 in parallel with the connection terminals 22 arranged in a vertical row in the vertical direction. In the present embodiment, the gap is formed as a slit 21 formed between adjacent backflow prevention diode modules 5 and 5 on one device mounting plate 3. Thereby, it becomes possible to suppress the heat transfer between the backflow prevention diode modules 5 and 5. Furthermore, if this slit 21 is formed on the same vertical line as the vent hole 13, it becomes possible to convect air over the entire housing 1, and heat radiation within the housing 1 can be performed more effectively. .

  The backflow prevention diode module 5 is provided with three connection terminals 22 (two 22a and 22b) as shown in FIG. 2, and the middle and lower positive lead bar connections as the input terminals of each connection terminal 22. A diode element connected to the terminal 22a is provided inside, and the upper positive bar connecting terminal 22b is an output terminal of the middle and lower positive lead bar connecting terminals 22a and 22a. Specifically, the three connection terminals 22 are arranged in a vertical direction in the casing 1, and in particular, the two positive lead bar connection terminals 22 a to which the wiring from the positive terminal 19 of the branch switch 4 can be connected are in the middle stage. And a positive bar connection terminal 22b to which the positive bar 7 is connected by wiring. A plurality of backflow prevention diode modules 5 are arranged above the branch switch 4 at equal intervals in the left-right direction of the housing 1.

  After the above-described internal device is disposed in the housing 1, as shown in FIG. 1, a cover 23 that can be operated by exposing only the changeover switch portion of the branch switch 4 on the front surface thereof is provided. Mounted. The solar cell module may be either a single solar cell panel or a string of a plurality of solar cell panels, and the current collecting switch may be provided inside the housing 1. . In addition, a handle 24 for removal may be formed on the device mounting plate 3. In this embodiment, the switch mounting portion 12 of the branch switch 4 and the backflow prevention diode module 5 are formed on one device mounting plate 3, but a plurality of device mounting plates 3 are formed for each device. It is also possible to prevent the heat transfer from each device.

(Second Embodiment)
In the second embodiment shown in FIG. 7, a plurality of vent holes 13 formed narrower than the vent hole 13 shown in the first embodiment are formed in the arm portion 15.

(Third embodiment)
In the third embodiment shown in FIG. 8, one vent hole 13 shown in the second embodiment is formed in the arm portion 15.

(Fourth embodiment)
In the fourth embodiment shown in FIG. 9, a plurality of vent holes 13 formed narrower than the vent hole 13 shown in the third embodiment are formed in the arm portion 15.

  In any of the second to fourth embodiments described above, the backflow prevention diode module 5 is provided on the same vertical line as the vent hole 13, so that the air flowing in by convection can be reliably transferred to the backflow prevention diode module 5. Shall lead.

(Other embodiments)
In FIG. 10, a convection promoting member made of a fan 26 is provided below the casing 1 in place of the convection promoting member made of the louver 11 shown in the first embodiment. In addition, it is preferable to arrange | position the fan 26 so that it may be on the same perpendicular line as the vent hole 13 of the switch mounting part 12. FIG. Further, the fan 26 may be provided between the switch mounting portion 12 and the backflow prevention diode module 5 or above the backflow prevention diode module 5. Of course, the louver 11 and the fan 26 may be used as the convection promoting member.

DESCRIPTION OF SYMBOLS 1 Housing | casing 2 Door 3 Equipment mounting plate 4 Branch switch 5 Backflow prevention diode module 6 Positive electrode lead bar 7 Positive electrode bar 8 Negative electrode lead bar 9 Negative electrode bar 10 Current collecting cable 11 Louver 12 Switch mounting part 13 Vent hole 14 Mounting part 15 Arm portion 16 Standing fin 17 Radiation fin 18 Radiation fin fixture 19 Positive electrode terminal portion 20 Negative electrode terminal portion 21 Slit 22 Connection terminal 22a Positive electrode lead bar connection terminal 22b Positive electrode bar connection terminal 23 Cover 24 Handle 25 Bar holder 26 Fan 27 Input side terminal Part

Claims (5)

On the device mounting plate provided in the housing,
A branch switch that opens and closes the electric circuit of the solar cell module;
And a backflow prevention diode module disposed above the branch switch,
The housing is provided with a louver or a fan for introducing outside air into the housing ,
Furthermore, the branch switch is a heat dissipation structure in a current collection box for a solar power generation system mounted on the device mounting plate via a switch mounting part,
The switch mounting portion includes a mounting portion on which the branch switch is mounted, and arm portions that are bent from both ends of the mounting portion toward the device mounting plate.
A heat dissipation structure in a current collection box for a photovoltaic power generation system , wherein the arm portion is formed with a vent hole that guides air flowing into the housing through the louver or fan to the backflow prevention diode module.   The heat dissipation structure in a current collection box for a solar power generation system according to claim 1, wherein the backflow prevention diode module is provided on the same vertical line as the vent hole. The switch mounting portion has a substantially U-shaped cross section,
A mounting portion on which the branch switch is mounted;
From both ends of the mounting portion, it is composed of arms bent in the direction of the device mounting plate,
The heat dissipation structure in a current collection box for a solar power generation system according to claim 1 or 2, wherein the air hole is formed through both of the arm portions.   The current collection box for a photovoltaic power generation system according to claim 3, wherein a bus bar to which wiring of the backflow prevention diode module or the branch switch is connected is provided in front of the vent hole. Heat dissipation structure.   2. The solar power generation system according to claim 1, wherein the backflow prevention diode module is mounted on the mounting plate via a radiation fin, and the radiation fin is provided on the same vertical line as the vent hole. Heat dissipation structure in the current collection box.