Photovoltaic three-split junction box with heat dissipation structure

Abstract

The utility model relates to the field of photovoltaic junction boxes, in particular to a photovoltaic three-split junction box with a heat dissipation structure, which comprises a shell, a diode, a conductive and heat-conducting fin, a metal heat dissipation fin and a cable, a positioning column is arranged in the shell, the conductive and heat-conducting fin is clamped and positioned on the positioning column, a downward through channel is arranged in the positioning column, and the metal heat dissipation fin is arranged in the channel. The metal cooling fin comprises a top piece, a guide sleeve and a guide rod, the guide sleeve is fixed to the lower end of the top piece and arranged on the positioning column in a sleeving mode, the guide rod is fixed to the lower end of the top piece and located in the guide sleeve, and the guide rod penetrates through the channel to reach the lower end face of the shell. The cable is connected with the conductive and heat-conducting fin on the left side, the bottom of the shell is provided with the glue pouring guide groove which is communicated inwards, the conductive and heat-conducting fin dissipates a part of heat outwards through the heat-conducting silica gel and the shell on one hand, and conducts heat outwards through the metal cooling fin on the other hand, so that rapid conduction of the heat of the diode is guaranteed, and the using effect is better.

Description

Technical Field

[0001] The utility model relates to the field of photovoltaic junction boxes, in particular to a photovoltaic three-part junction box with a heat dissipation structure. Background Art

[0002] The photovoltaic junction box is a connection device between the solar cell array composed of solar cell modules and the solar charging control device. Its main function is to connect and protect solar photovoltaic modules, connect the power generated by solar cells to external circuits, and conduct the current generated by photovoltaic modules.

[0003] Currently, the mainstream use of module diodes in photovoltaic junction boxes is in epoxy resin. This makes it difficult for heat to dissipate during junction temperature and thermal runaway testing, leading to high temperatures and diode failure. Under normal use, module diodes may function normally. However, in certain circumstances, such as shade from trees or foreign objects, the module diodes may overheat and burn out.

[0004] Therefore, in order to solve the deficiencies in the prior art, it is necessary to design a photovoltaic three-part junction box with a simple structure and a heat dissipation structure. Utility Model Content

[0005] In order to solve the problems of the prior art, the utility model provides a photovoltaic three-part junction box with a heat dissipation structure.

[0006] The purpose of the utility model can be achieved through the following technical solutions: A photovoltaic three-part junction box with a heat dissipation structure includes: a shell, a diode, a conductive heat-conducting sheet, a metal heat sink and a cable, a positioning column is provided inside the shell, the conductive heat-conducting sheet is snap-fitted and positioned on the positioning column, a downward-through channel is provided inside the positioning column, the two ends of the diode are connected to the respective adjacent conductive heat-conducting sheets, the lower end of the conductive heat-conducting sheet is connected with a wing span, the metal heat sink includes a top sheet, a guide sleeve and a guide rod, the guide sleeve is fixed to the lower end of the top sheet and is sleeved on the positioning column, the guide rod is fixed to the lower end of the top sheet and is located inside the guide sleeve, the guide rod passes through the channel to the lower end surface of the shell, the cable is connected to the conductive heat-conducting sheet on the left, and the bottom of the shell is provided with an inwardly connected glue pouring guide groove.

[0007] As a further improvement, a groove having a diameter larger than that of the channel and connected thereto is provided at the bottom of the shell, a heat dissipation disc is fixed in the groove, and the upper end of the heat dissipation disc is in contact with the guide rod.

[0008] As a further improvement, a tapered guide portion is provided at the upper end of the positioning column.

[0009] As a further improvement, the positioning posts and guide sleeves are symmetrically arranged in four groups.

[0010] As a further improvement, the top sheet includes a left top sheet, a right top sheet and a connecting sheet, the connecting sheet is connected between the left top sheet and the right top sheet, the left top sheet is fixed to the upper end of the left guide sleeve, and the right top sheet is fixed to the upper end of the right guide sleeve.

[0011] Compared with the existing technology, the photovoltaic three-part junction box with heat dissipation structure of the utility model has the following beneficial effects:

[0012] The heat generated by the diode is transferred to the conductive heat conductive sheet. The conductive heat conductive sheet and the wing spans on both sides of it greatly increase the heat conduction area. On the one hand, the conductive heat conductive sheet dissipates part of the heat outward through the thermal conductive silicone and the shell. On the other hand, the heat is first transferred to the metal guide sleeve, and then through the metal top sheet and the metal guide rod to conduct heat outward. The material of the metal heat sink increases the heat dissipation speed, thereby ensuring rapid heat conduction of the diode and better use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the utility model

[0014] Figure 2 This is a structural diagram of the local structure of the utility model

[0015] Figure 3 for Figure 1 Structural diagram from another perspective

[0016] Figure 4 This is a schematic diagram of the structure of the diode, conductive heat conductive sheet and metal heat sink in this utility model.

[0017] Figure 5 This is a schematic diagram of the structure of the metal heat sink in this utility model

[0018] In the figure, 1-shell, 11-positioning column, 111-conical guide part, 12-channel, 13-groove, 2-diode, 3-conductive and thermal conductive plate, 31-wing span, 4-metal heat sink, 41-top plate, 411-left top plate, 412-right top plate, 413-connecting plate, 42-guide sleeve, 43-guide rod, 5-cable, 6-heat sink disc, 7-glue pouring guide groove. DETAILED DESCRIPTION

[0019] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0020] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0021] Below with reference to the embodiment and the attached Figures 1 to 5 , the technical solution of the utility model is further elaborated.

[0022] Example 1

[0023] A photovoltaic three-part junction box with a heat dissipation structure includes: a shell 1, a diode 2, a conductive and thermally conductive sheet 3, a metal heat sink 4 and a cable 5. A positioning column 11 is provided inside the shell 1, and the conductive and thermally conductive sheet 3 is snap-fitted and positioned on the positioning column 11. A downward-running channel 12 is provided inside the positioning column 11. The two ends of the diode 2 are connected to the respective adjacent conductive and thermally conductive sheets 3. The lower end of the conductive and thermally conductive sheet 3 is connected with a wingspan portion 31. The metal heat sink 4 includes a top sheet 41, a guide sleeve 42 and a guide rod 43. The guide sleeve 42 is fixed to the lower end of the top sheet 41 and is sleeved on the positioning column 11. The guide rod 43 is fixed to the lower end of the top sheet 41 and is located inside the guide sleeve 42. The guide rod 43 passes through the channel 12 to the lower end surface of the shell 1. The cable 5 is connected to the conductive and thermally conductive sheet 3 on the left side. The bottom of the shell 1 is provided with an inwardly connected glue pouring guide groove 7.

[0024] like Figures 1 to 5 As shown, the operating principle of the present invention is as follows: the diode 2 is fixed to the lower end of the conductive thermal conductive sheet 3, the conductive thermal conductive sheet 3 is sleeved on the positioning column 11 inside the shell 1, and then the metal heat sink 4 is sleeved on the upper end of the positioning column 11, and the shell 1 is closed after connecting the cable 5. After the installation is completed, glue is poured from the glue guide groove 7. The heat generated by the diode 2 is transferred to the conductive thermal conductive sheet 3. The conductive thermal conductive sheet 3 and the wing spans 31 on both sides of it greatly increase the heat conduction area. On the one hand, the conductive thermal conductive sheet 3 dissipates part of the heat outward through the thermal conductive silicone and the shell 1, and on the other hand, the heat is first transferred to the metal guide sleeve 42, and then through the metal top sheet 41 and the metal guide rod 43, to conduct heat outward. The material of the metal heat sink 4 increases the heat dissipation speed, thereby ensuring that the heat of the diode is quickly conducted, and the use effect is better.

[0025] As a further preferred embodiment, the bottom of the housing 1 is provided with a groove 13 having a diameter larger than that of the channel 12 and communicating therewith. A heat dissipation disc 6 is fixed in the groove 13, and the upper end of the heat dissipation disc 6 contacts the guide rod 43. The heat dissipation disc 6 further increases the conduction efficiency of the guide rod 43.

[0026] As a further preferred embodiment, a tapered guide portion 111 is provided at the upper end of the positioning column 11. The tapered guide portion 111 facilitates the rapid positioning and insertion of the conductive and thermally conductive sheet 3.

[0027] As a further preferred embodiment, the positioning columns 11 and guide sleeves 42 are symmetrically arranged in four groups to improve the stability of the installation.

[0028] As a further preferred embodiment, the top sheet 41 includes a left top sheet 411, a right top sheet 412 and a connecting sheet 413, wherein the connecting sheet 413 is connected between the left top sheet 411 and the right top sheet 412, the left top sheet 411 is fixed to the upper end of the left guide sleeve 42, and the right top sheet 412 is fixed to the upper end of the right guide sleeve 42.

[0029] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art based on the concepts of the present invention through logical analysis, reasoning, or limited experimentation based on the existing technology should be within the scope of protection defined by the claims.

Claims

1. A photovoltaic three-part junction box with a heat dissipation structure, characterized in that: include: A shell, a diode, a conductive thermal sheet, a metal heat sink and a cable. A positioning column is provided inside the shell. The conductive thermal sheet is snap-fitted and positioned on the positioning column. A downward-running channel is provided inside the positioning column. The two ends of the diode are connected to the respective adjacent conductive thermal sheets. The lower end of the conductive thermal sheet is connected with a wing span. The metal heat sink includes a top sheet, a guide sleeve and a guide rod. The guide sleeve is fixed to the lower end of the top sheet and sleeved on the positioning column. The guide rod is fixed to the lower end of the top sheet and is located inside the guide sleeve. The guide rod passes through the channel to the lower end surface of the shell. The cable is connected to the conductive thermal sheet on the left. The bottom of the shell is provided with an inwardly connected glue pouring guide groove.

2. The photovoltaic three-part junction box with a heat dissipation structure according to claim 1, characterized in that: The bottom of the shell is provided with a groove with a diameter larger than that of the channel and connected thereto. A heat dissipation disc is fixed in the groove, and the upper end of the heat dissipation disc is arranged in contact with the guide rod.

3. The photovoltaic three-part junction box with a heat dissipation structure according to claim 1, characterized in that: A tapered guide portion is provided at the upper end of the positioning column.

4. The photovoltaic three-part junction box with a heat dissipation structure according to claim 1, characterized in that: The positioning columns and guide sleeves are symmetrically arranged in four groups.

5. The photovoltaic three-part junction box with a heat dissipation structure according to claim 1, characterized in that: The top sheet includes a left top sheet, a right top sheet and a connecting sheet, wherein the connecting sheet is connected between the left top sheet and the right top sheet, the left top sheet is fixed to the upper end of the left guide sleeve, and the right top sheet is fixed to the upper end of the right guide sleeve.

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