CN201360124Y - Junction box for solar photovoltaic power generation system - Google Patents

Abstract

The utility model discloses a terminal box for solar photovoltaic power generation system, including upper cover and box body, the upper cover lock in on the box body, install two at least connection terminal in the box body, adjacent two through bypass diode electric connection between the connection terminal, connection terminal one end is the input, the input with solar cell panel lead wire electric connection, the other end with install the binding post electric connection of box body one side, wherein, the upper cover upper surface is equipped with heat abstractor, heat abstractor comprises the fin of a plurality of relative upper cover upper surface slopes, and is adjacent form the ponding recess on the upper cover upper surface between the fin, the box body both sides are equipped with the bleeder vent respectively, install waterproof ventilated membrane and metal crystallization filter core in proper order from outside to inside in the bleeder vent, compare with general terminal box, the utility model discloses terminal box for solar photovoltaic power generation system has good waterproof, Moisture-proof and heat dissipation performance, and greatly prolonged service life.

Description

Junction box for solar photovoltaic power generation system

technical field

The utility model relates to a wiring assembly for a solar photovoltaic power generation system, in particular to a junction box for a solar photovoltaic power generation system with good waterproof, moisture-proof and heat dissipation performances.

Background technique

The junction box for solar photovoltaic power generation system is a transition device installed on the solar panel to connect the lead wire of the solar panel with the external lead wire. There are generally multiple bypass diodes inside, and the bypass diode is used to prevent Reverse charging damages the cells and prevents the disconnection of one photocell from rendering the entire battery pack unusable.

When solar photovoltaic power generation, a large current will flow through the bypass diode in the solar junction box, causing the bypass diode to heat up. If the heat is not dissipated in time, the performance of the bypass diode working for a long time under continuous high temperature It will gradually decline, shorten the life, and even lead to open circuit in severe cases, which will eventually affect the work of solar panels and even damage expensive solar modules.

Junction boxes for solar photovoltaic power generation systems are generally in the open air, exposed to the sun and rain, and the working environment is harsh, and there are electrical components installed inside. Therefore, this requires that the solar junction box must be waterproof, moisture-proof, and UV-resistant.

Generally used junction boxes for solar photovoltaic power generation systems do not have heat dissipation equipment and are all in a sealed state. Although the waterproof effect is good, the heat dissipation performance is poor. For the heat dissipation performance, there is an improved junction box for solar photovoltaic power generation systems, which is a sealed structure with a heat sink inside and installed around the bypass diode. Although this can dissipate the heat of the bypass diode itself, the , obviously, the heat still stays inside the sealed box and cannot be dissipated quickly, and the heat dissipation performance needs to be further improved.

Therefore, there is an urgent need for a junction box for solar photovoltaic power generation systems with good waterproof, moisture-proof and heat dissipation properties.

Utility model content

The purpose of the utility model is to provide a junction box for a solar photovoltaic power generation system with good waterproof, moisture-proof and heat dissipation performance.

In order to achieve the above object, the technical solution of the present invention is to provide a junction box for a solar photovoltaic power generation system, including an upper cover and a box body, the upper cover is fastened on the box body, and a At least two terminal blocks, two adjacent terminal blocks are electrically connected by bypass diodes, one end of the terminal block is an input end, and the input end is electrically connected to the lead wire of the solar cell panel, and the other end is It is electrically connected with the terminal installed on one side of the box body, wherein a heat dissipation device is provided on the upper surface of the upper cover, and the heat dissipation device is composed of a number of heat sinks inclined relative to the upper surface of the upper cover, adjacent to the Water accumulation grooves are formed on the upper surface of the upper cover between the cooling fins, and air holes are respectively provided on both sides of the box body, and a waterproof breathable film and a metal crystal filter core are sequentially installed in the air holes from outside to inside.

Preferably, the box body and the upper cover are made of aluminum alloy, and the heat dissipation device and the upper cover are integrally formed. The aluminum alloy box body and the upper cover have good heat conduction ability, which can make the solar The heat in the junction box of the photovoltaic power generation system is quickly transferred to the outside world, and it also effectively avoids the disadvantage that the junction box of the solar photovoltaic power generation system generally made of plastic is easy to age due to ultraviolet radiation.

Preferably, an insulating heat conducting plate is provided between the upper end of the bypass diode and the lower bottom surface of the upper cover, and one side of the insulating heat conducting plate is closely attached to the bypass diode, and the other side is closely attached to the upper cover. Covering the bottom surface, the insulating and heat-conducting plate separates the bypass diode from the aluminum alloy upper cover to prevent short circuit, and also quickly conducts the heat generated by the bypass diode to the outside.

Preferably, the lower bottom of the upper cover has a protruding fixing shaft, the box body has a mounting hole matched with the fixing shaft, and the fixing shaft is installed in the mounting hole so that the upper cover and The box body is tightly connected, and the connection is simple and practical.

Preferably, an annular groove is formed at the joint between the upper cover and the box body, and an elastic sealing ring is closely attached to the annular groove, and the elastic sealing ring connects the upper cover and the box body. The gaps between them are tightly closed to prevent external water from penetrating into the box body through the gaps.

Compared with the prior art, the utility model has the advantages of forming water accumulation grooves on the upper surface of the upper cover between the adjacent cooling fins of the solar photovoltaic power generation system junction box of the utility model, and the two sides of the box body are respectively provided with ventilation The air holes are installed with a waterproof breathable film and a metal crystal filter element in sequence from the outside to the inside. The heat sink increases the heat dissipation area of the upper cover on the one hand, and the water accumulation groove formed by the heat sink can Natural storage of rainwater, through the evaporation of rainwater can greatly improve the heat dissipation effect of the junction box for the solar photovoltaic power generation system of the present invention, so that the junction box for the entire solar photovoltaic power generation system has good heat dissipation performance; the waterproof breathable film and the metal crystal filter core guarantee The interior of the junction box for the solar photovoltaic power generation system communicates with the outside world while increasing the heat dissipation capacity of the junction box for the solar photovoltaic power generation system, while also ensuring the purpose of drying and waterproofing in the junction box for the solar photovoltaic power generation system; thereby greatly improving the solar photovoltaic power generation capacity of the utility model. The junction box used in the power generation system has waterproof, moisture-proof and heat dissipation performance, and its service life is also greatly improved.

Description of drawings

Fig. 1 is a structural schematic diagram of a junction box for a solar photovoltaic power generation system of the present invention.

FIG. 2 is an exploded schematic diagram of FIG. 1 .

FIG. 3 is an enlarged view of part B in FIG. 2 .

Fig. 4 is a structural schematic diagram of the upper cover of the junction box for the solar photovoltaic power generation system of the present invention.

Fig. 5 is a sectional view along the direction A-A of Fig. 4 .

Fig. 6 is a structural schematic diagram of removing the upper cover of the junction box used in the solar photovoltaic power generation system of the present invention.

Detailed ways

As shown in Fig. 1, Fig. 2 and Fig. 3, a junction box 100 for a solar photovoltaic power generation system includes an upper cover 1 and a box body 2, the upper cover 1 is fastened on the box body 2, and the box body 1 At least two terminal blocks 3 are installed inside, and two adjacent terminal blocks 3 are electrically connected by bypass diodes 4. One end of the terminal blocks 3 is an input terminal 3a, and the input terminal 3a passes through the box The opening 2c on the bottom surface of the body is electrically connected to the lead wire of the solar cell panel (not shown in the figure), and the other end is electrically connected to the terminal 5 installed on one side of the box body 1, wherein the upper surface 1b of the upper cover is provided There is a heat dissipation device 6, and the heat dissipation device 6 is composed of a plurality of cooling fins 6a inclined relative to the upper surface 1b of the upper cover, and a water accumulation groove 6b is formed on the upper surface 1b of the upper cover between adjacent cooling fins 6a, Both sides of the box body 1 are respectively provided with air holes 2a, and the air holes 2a are sequentially installed with a waterproof air-permeable membrane 7 and a metal crystal filter core 8 from outside to inside.

In the box body 2 of the junction box 100 for the solar photovoltaic power generation system of the present utility model, four junction seats are installed, and the heat dissipation device 6 is composed of a plurality of heat dissipation fins 6a inclined relative to the upper surface 1b of the upper cover, which increases the size of the junction box. The heat dissipation area of the heat dissipation device 6 in contact with the air enables the heat to be quickly dissipated to the outside of the junction box 100 for the solar photovoltaic power generation system when the bypass diode 4 is in operation, so that the bypass diode 4 can always maintain a low temperature working state; in addition, since the junction box 100 of the solar photovoltaic power generation system of the present invention works in an open-air environment, the water accumulation groove 6b formed by the adjacent heat sink 6a and the upper surface 1b of the upper cover can be Rainwater is stored in rainy days. When it is sunny, the heat taken away by the evaporation of rainwater in the water accumulation groove 6b will greatly improve the heat dissipation effect of the junction box 100 for solar photovoltaic power generation system of the present invention. The waterproof breathable membrane 7 can prevent rainwater from entering, but air can pass through freely, so that on the one hand, it can prevent moisture from entering the inside of the box body 2, causing a short circuit and damaging electrical components. On the other hand, the solar photovoltaic power generation system can Keeping the internal air pressure of the junction box 100 consistent with the external air pressure prevents the junction box from being deformed and the air passing through the air hole 2a can help the interior of the junction box to ventilate and dissipate heat. The metal crystallization filter core 8 can absorb moisture in the air and filter particles in the air, keep the inside of the box body 2 dry and clean, and prevent some charged particles from entering to cause a short circuit. More specifically, as shown in Figure 4, Figure 5 and Figure 6, as follows:

Preferably, the box body 2 and the upper cover 1 are made of aluminum alloy, the heat dissipation device 6 is integrally formed with the upper cover 1, and the box body 2 and the upper cover 1 made of aluminum alloy have good thermal conductivity, It can make the heat in the junction box 100 for solar photovoltaic power generation system of the present utility model be quickly transferred to the outside world, and also effectively avoid the disadvantage that the junction box 100 for solar photovoltaic power generation system made of plastic is easy to age due to ultraviolet radiation .

Preferably, an insulating heat conducting plate 9 is provided between the upper end of the bypass diode 4 and the bottom surface of the upper cover 1, one side of the insulating heat conducting plate 9 is closely attached to the bypass diode 4, and the other side is closely attached to the bypass diode 4. Attached to the lower bottom surface of the upper cover 1, the insulating and heat-conducting plate 9 separates the bypass diode 4 from the upper cover 1 made of aluminum alloy to prevent short circuit, and also quickly dissipate the heat generated by the bypass diode 4. transmitted to the outside world.

Preferably, the bottom of the upper cover 1 has a protruding fixed shaft 1a, the box body 2 has a mounting hole 2b matching the fixed shaft 1a, and the fixed shaft 1a is installed in the mounting hole 2b , so that the upper cover 1 is closely connected with the box body 2, and the connection is simple and practical.

Preferably, an annular groove 10 is formed at the joint between the upper cover 1 and the box body 2, and an elastic sealing ring 11 is closely attached to the annular groove 10, and the elastic sealing ring 11 seals the upper cover. The gap between 1 and the box body 2 is tightly closed to prevent external water from seeping into the box body 2 through the gap.

1 to 6, the structure and heat dissipation principle of the junction box 100 for the solar photovoltaic power generation system of the present invention are described in detail: the box body 2 of the junction box 100 for the solar photovoltaic power generation system is provided with four The terminal 3a at one end of the terminal 3 is connected to the lead wire of the solar panel through the opening 2c on the bottom surface of the box body 2, and the other end is connected to the terminal 5 installed on one side of the box body 2. connected, the two sides of the box body 2 are provided with air holes 2a, the air holes 2a are built with a waterproof breathable film 7 and a metal crystal filter core 8, and the bypass diode 4 is closely attached to the side of the insulating heat conducting plate 9, so The other side of the insulating and heat-conducting plate 9 is closely attached to the lower bottom surface of the upper cover 1, and the upper surface 1b of the upper cover is provided with the heat dissipation device 6 integrally formed with it, through which the fixed shaft 1a and the box body 2 are fastened together, and the sealing ring 11 is tightly attached to the annular groove 10 between the upper cover 1 and the box body 2 . When the solar panel absorbs solar energy and converts it into electrical energy, the current generated by the solar panel flows through the bypass diode 4, and the bypass diode 4 generates heat. The heat generated by the bypass diode 4 and the irradiation of sunlight The heat generated by the junction box is conducted to the heat sink 6 through the insulating heat conducting plate 9 for heat dissipation, and the external air passes through the waterproof breathable membrane 7 and the metal crystal filter core 8 in the air hole 2a to enter and exit the solar energy. The junction box 100 for the photovoltaic power generation system takes away part of the heat inside the junction box 100 for the solar photovoltaic power generation system, so that the components in the junction box 100 for the solar photovoltaic power generation system continue to work at low temperature.

The junction box 100 for the solar photovoltaic power generation system of the present utility model forms a water accumulation groove 6b on the upper surface 1b of the upper cover between the adjacent heat sinks 6a, and the two sides of the box body 2 are respectively provided with vent holes 2a, and the ventilating A waterproof breathable membrane 7 and a metal crystal filter element 8 are sequentially installed in the hole 2a from the outside to the inside. The heat sink 6a increases the heat dissipation area of the upper cover 1 on the one hand, and the water accumulation groove formed by the heat sink 6a on the other hand 6b can store rainwater naturally, and the heat dissipation effect of the junction box 100 for the solar photovoltaic power generation system of the present utility model can be greatly improved through the evaporation of rainwater, so that the junction box 100 for the entire solar photovoltaic power generation system has good heat dissipation performance; the waterproof breathable film 7 and The metal crystalline filter element 8 ensures that the inside of the junction box 100 for the solar photovoltaic power generation system communicates with the outside world, while increasing the heat dissipation capacity of the junction box 100 for the solar photovoltaic power generation system, it also ensures that the inside of the junction box 100 for the solar photovoltaic power generation system is dry and waterproof ; Thereby greatly improving the waterproof, moisture-proof and heat dissipation performance of the junction box 100 used in the solar photovoltaic power generation system of the present invention, and the service life is also greatly improved.

The sizes and installation methods of the upper cover 1, the box body 2, the wiring seat 3 and the sealing ring 11 involved in the junction box 100 for the solar photovoltaic power generation system of the present invention are well known to those skilled in the art, and will not be described here. Detailed explanation.

What is disclosed above is only a preferred example of the utility model, and of course the scope of rights of the utility model cannot be limited with this. Therefore, equivalent changes made according to the patent scope of the utility model still belong to the scope covered by the utility model .

Claims (5)

1. A junction box for a solar photovoltaic power generation system, comprising a loam cake and a box body, the loam cake is fastened on the box body, at least two terminal blocks are installed in the box body, two adjacent The terminal blocks are electrically connected through bypass diodes, one end of the terminal block is the input end, the input end is electrically connected to the lead wire of the solar panel, and the other end is connected to the terminal installed on one side of the box body Electrically connected, it is characterized in that: the upper surface of the upper cover is provided with a heat dissipation device, and the heat dissipation device is composed of a number of heat sinks inclined relative to the upper surface of the upper cover, and the adjacent heat sinks are on the upper surface of the upper cover Water accumulation grooves are formed, vent holes are respectively provided on both sides of the box body, and waterproof breathable membranes and metal crystal filter cores are installed in the vent holes sequentially from outside to inside. 2 . The junction box for a solar photovoltaic power generation system according to claim 1 , wherein the box body and the upper cover are made of aluminum alloy, and the heat sink is integrally formed with the upper cover. 3 . 3. The junction box for solar photovoltaic power generation system according to claim 1, characterized in that: an insulating and heat conducting plate is provided between the upper end of the bypass diode and the lower bottom surface of the upper cover, and one side of the insulating and heat conducting plate is tightly closed. It is attached to the bypass diode, and the other side is attached to the bottom surface of the upper cover. 4 . The junction box for a solar photovoltaic power generation system according to claim 1 , wherein the upper cover and the lower bottom have protruding fixing shafts, and the box body has mounting holes matching the fixing shafts. 5. The junction box for solar photovoltaic power generation system according to claim 1, characterized in that: the joint between the upper cover and the box body forms an annular groove, and an elastic sealing ring is closely attached to the annular groove .

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