An external potting reactor

Abstract

The present invention relates to the field of power electronics technology, and discloses an external potted reactor, including a heat dissipation lower shell and a heat dissipation upper shell, wherein one end of the heat dissipation lower shell is open, and a heat conductive potting glue and at least one reactor are arranged therein, and the reactor is connected with input and output cables, and the heat dissipation upper shell covers the open end of the heat dissipation lower shell, and a boss is arranged on the heat dissipation upper shell, and a threading hole for passing the input and output cables is arranged in the boss. The potted reactor designed by the present invention solves the problem of high protection temperature rise caused by the potted reactor in outdoor high protection level string inverters, thereby reducing the ambient temperature of the device in the high protection cabin, reducing the operating risk of the equipment and the cost of related components, enhancing the heat dissipation conditions of the potted reactor itself, reducing the temperature rise of the potted reactor itself, and under the same temperature rise conditions, the wire diameter of the enameled wire can be reduced, thereby reducing the cost and improving the competitiveness of the product.

Description

Technical Field

[0001] The invention relates to the technical field of power electronics, and in particular to an external potting reactor. Background Art

[0002] With the continuous development of new energy industries such as photovoltaic storage, string inverters have been increasing their market share year by year due to their small size, light weight, convenient and quick handling and installation, and no influence of fault correlation between each other. String photovoltaic and energy storage inverters are both outdoor types, with a protection level of IP65 or above. Therefore, the commonly used reactors are potted reactors, which are open heat dissipation shells. The reactor components are placed in them, and the shell is filled with potting glue with good thermal conductivity. On the one hand, it strengthens the overall performance of the reactor, improves the resistance to external impact and vibration, improves the insulation between the internal components and the shell, and can play a fixing role. On the other hand, it fills the air gap between the reactor itself and the heat dissipation shell, and smoothly conducts the heat of the reactor to the heat dissipation shell, reducing thermal resistance, which is beneficial to the self-cooling of the reactor. Because the IP protection level of the string inverter is high, the opening surface of the potted inductor faces the high protection compartment of the inverter box, which means that only 5 surfaces of the potted inductor are in direct contact with the outside air for heat dissipation in the low protection compartment. The remaining one opening surface will transfer part of the heat directly to the high protection compartment, increasing the temperature rise of the high protection compartment, thereby increasing the difficulty of the thermal design scheme of the high protection compartment. Summary of the invention

[0003] The technical problem to be solved by the present invention is that the existing potted reactor has a low heat dissipation rate and can transfer heat to the high protection cabin.

[0004] In order to solve the above technical problems, the technical solution of the present invention is to provide an external potted inductor, including a heat dissipation lower shell and a heat dissipation upper shell, one end of the heat dissipation lower shell is open, and a thermal conductive potting glue and at least one inductor are arranged therein, and input and output cables are connected to the inductor, and the input and output cables extend from the open end of the heat dissipation lower shell, and the heat dissipation upper shell covers the open end of the heat dissipation lower shell, and a boss is provided on the heat dissipation upper shell, and a threading hole for passing the input and output cables is provided in the boss.

[0005] Optionally, corresponding fixing holes are provided at the four corners of the opening end of the heat dissipation lower shell and the four corners of the heat dissipation upper shell, and fastening bolts are provided in the fixing holes.

[0006] Optionally, a heat dissipation lower shell sealing strip is provided at the edge of the opening end of the heat dissipation lower shell, and a plurality of heat conducting sheets are provided on the outer wall of the heat dissipation lower shell.

[0007] Optionally, a heat dissipation upper shell sealing strip is provided at the edge of the boss, and heat dissipation upper shell fixing holes are provided on both sides of the threading hole on the boss.

[0008] In summary, the potted reactor designed in the present invention solves the problem of high protection temperature rise caused by the potted reactor in outdoor high protection level string inverters, thereby reducing the ambient temperature of the devices operating in the high protection cabin, reducing the operating risks of the equipment and the costs of related components, enhancing the heat dissipation conditions of the potted reactor itself, and reducing the temperature rise of the potted reactor itself. Under the same temperature rise conditions, the wire diameter of the enameled wire can be reduced, thereby reducing costs and improving product competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the heat dissipation lower housing structure of the present invention;

[0010] Figure 2 This is a schematic diagram of the heat dissipation upper housing structure of the present invention;

[0011] Figure 3 It is a schematic diagram of the overall structure of the present invention;

[0012] Figure 4 This is a schematic diagram of a separate installation structure of the present invention;

[0013] Figure 5 This is a schematic diagram of the combined installation structure of the present invention;

[0014] In the figure: 1. Heat dissipation lower shell; 2. Heat dissipation upper shell; 3. Thermal conductive potting glue; 4. Boss; 5. Input and output cables; 6. Threading hole; 7. Fixing hole; 8. Heat dissipation lower shell sealing strip; 9. Heat dissipation upper shell sealing strip; 10. Heat dissipation upper shell fixing hole; 11. Fastening bolts; 12. Inverter high protection cabin box. DETAILED DESCRIPTION

[0015] The following combination Figure 1-5 The present invention is described in further detail.

[0016] The present invention discloses an external potting reactor, referring to Figure 1 and Figure 2 , comprising a heat dissipation lower shell 1 and a heat dissipation upper shell 2, wherein the heat dissipation lower shell 1 is open at one end, and is provided with a thermally conductive potting glue 3 and at least one reactor, the reactor is connected with an input and output cable 5, and the input and output cable 5 extends from the open end of the heat dissipation lower shell 1, the heat dissipation upper shell 2 covers the open end of the heat dissipation lower shell 1, the heat dissipation upper shell 2 is provided with a boss 4, and the boss 4 is provided with a threading hole 6 for passing the input and output cable 5; the four corners of the open end of the heat dissipation lower shell 1 and the four corners of the heat dissipation upper shell 2 are provided with corresponding fixing holes 7, and the fixing holes 7 are provided with fastening bolts 11.

[0017] In a further embodiment, a heat dissipation lower shell sealing strip 8 is provided at the edge of the opening end of the heat dissipation lower shell 1, a plurality of heat conducting plates are provided on the outer wall of the heat dissipation lower shell 1, a heat dissipation upper shell sealing strip 9 is provided at the edge of the boss 4, and heat dissipation upper shell fixing holes 10 are provided on both sides of the threading hole 6 on the boss 4.

[0018] Example

[0019] like Figure 3 As shown, in the present embodiment, two parallel annular reactors are arranged in the heat dissipation lower shell 1, and are potted once with a thermal conductive potting glue 3, two groups of input and output cables 5 extend from the reactor, and four bosses 4 are arranged on the heat dissipation upper shell 2, and the two groups of input and output cables 5 extend from the corresponding threading holes 6 on the bosses 4, and then the heat dissipation lower shell 1 and the heat dissipation upper shell 2 are fixed with fastening bolts 11, and then the thermal conductive potting glue 3 is poured from the threading holes 6 for secondary potting.

[0020] When the present invention is used alone, refer to Figure 4 , place the heat dissipation upper shell 2 toward the inverter high protection cabin box 12, and then use screws to pass through the heat dissipation upper shell fixing holes 10 to fix it, and then connect the input and output cables 5. Because the external potted inductor heat dissipation upper shell 2 has four bosses 4, when air cooling is performed, the six surfaces of the external potted inductor can be air-cooled and dissipated, which increases the exchange area between the inductor and the air, improves the heat dissipation efficiency, and the direct heat transfer between the direct contact surface with the high protection cabin and the high protection cabin is basically zero and negligible, which greatly reduces the temperature rise effect on the high protection cabin.

[0021] like Figure 5 As shown, the present invention can also be used in combination of multiple ones, which can be installed on the inverter high protection cabin box 12 at uniform intervals.

[0022] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An external potting reactor, characterized in that: The invention comprises a heat dissipation lower shell (1) and a heat dissipation upper shell (2); one end of the heat dissipation lower shell (1) is open, and a heat conductive potting glue (3) and at least one reactor are arranged therein; the reactor is connected to an input / output cable (5), and the input / output cable (5) extends from the open end of the heat dissipation lower shell (1); the heat dissipation upper shell (2) covers the open end of the heat dissipation lower shell (1); a boss (4) is arranged on the heat dissipation upper shell (2), and a threading hole (6) for passing the input / output cable (5) is arranged therein.

2. The external potted reactor according to claim 1, characterized in that: Mutually corresponding fixing holes (7) are provided at the four corners of the opening end of the heat dissipation lower shell (1) and the four corners of the heat dissipation upper shell (2), and fastening bolts (11) are provided in the fixing holes (7).

3. The external potted reactor according to claim 2, characterized in that: A heat dissipation lower shell sealing strip (8) is provided at the edge of the opening end of the heat dissipation lower shell (1), and a plurality of heat conducting sheets are provided on the outer wall of the heat dissipation lower shell (1).

4. The external potted reactor according to claim 1, characterized in that: A heat dissipation upper shell sealing strip (9) is provided at the edge of the boss (4), and heat dissipation upper shell fixing holes (10) are provided on both sides of the threading hole (6) on the boss (4).

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