CN220421766U - Box assembly of photovoltaic inverter and photovoltaic inverter - Google Patents

Abstract

The utility model discloses a box body assembly of a photovoltaic inverter and the photovoltaic inverter, wherein the box body assembly comprises a power box and a distribution box positioned at the outer side of the power box, the power box is provided with a first cavity and comprises a first side wall, the distribution box is connected to the first side wall and is provided with a second cavity, a first through hole for communicating the first cavity with the second cavity is formed in the first side wall, and a waterproof ventilation valve is arranged in the first through hole; the box assembly further comprises an electromagnetic shielding cover, the electromagnetic shielding cover is arranged inside the waterproof ventilation valve cover, a plurality of ventilation through holes are formed in the electromagnetic shielding cover, and the aperture of each ventilation through hole is smaller than 5mm. The box body assembly can quickly solve the problems of temperature rise in the power box and wiring of the distribution box under the condition of not increasing more cost.

Description

Box assembly of photovoltaic inverter and photovoltaic inverter

Technical Field

The utility model belongs to the technical field of power electronic devices, and particularly relates to a box assembly of a photovoltaic inverter and the photovoltaic inverter.

Background

With the recent trend of energy revolution, the photovoltaic industry has rapidly developed, the overall size of the photovoltaic device is smaller and smaller, the power density is larger and larger, and low cost is required. The photovoltaic inverter for partial industry, commercial and ground power stations increasingly uses a design that a power box and a distribution box are two independent sealed cavities, and the distribution box is positioned at the side surface of the power box. Therefore, the problems of wiring of two cavities, electromagnetic compatibility and the like can be effectively reduced, and the overall dimension of the whole machine is effectively reduced so as to reduce the manufacturing cost.

However, this also causes a certain defect, and as the power density in the power box increases, the power box and the power box are separated, so that the heat in the power box is high easily, and the material cost is greatly increased by increasing the area of the radiator or changing the fan with larger air quantity. Therefore, the problem of heat dissipation in the power box needs to be solved under the condition of not increasing more cost.

Disclosure of Invention

In order to solve the technical problems, the utility model provides a box assembly of a photovoltaic inverter and the photovoltaic inverter, which can quickly solve the problem of temperature rise in a power box under the condition of not increasing more cost.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the box body assembly of the photovoltaic inverter comprises a power box and a distribution box positioned at the outer side of the power box, wherein the power box is provided with a first cavity and comprises a first side wall, the distribution box is connected to the first side wall and is provided with a second cavity, a first through hole for communicating the first cavity with the second cavity is formed in the first side wall, and a waterproof ventilation valve is arranged in the first through hole; the box assembly further comprises an electromagnetic shielding cover, the electromagnetic shielding cover is arranged inside the waterproof ventilation valve cover, a plurality of ventilation through holes are formed in the electromagnetic shielding cover, and the aperture of each ventilation through hole is smaller than 5mm.

More preferably, the pore diameter of the ventilation through hole is 2-4mm.

Preferably, the electromagnetic shielding cover is located in the second cavity, and a cable fixing piece for fixing the cable is arranged on the electromagnetic shielding cover.

Preferably, the cable fixing member is connected to the electromagnetic shield through a fastener, and the cable passes through between the fastener and the electromagnetic shield.

More preferably, the cable fixing member includes a locking portion fixedly connected to the electromagnetic shield through a fastener, and a protruding portion upwardly arched with respect to the locking portion, the protruding portion and the locking portion forming a space through which the cable passes; the cable fixing pieces are arranged on the electromagnetic shielding cover in a staggered mode.

In a preferred embodiment, the power box and the distribution box are two boxes which are independently arranged, the distribution box is provided with a second side wall opposite to the first side wall, the first side wall and the second side wall are fixedly connected, a second through hole is formed in the second side wall, and the waterproof ventilation valve is arranged in the first through hole and the second through hole; the apertures of the first through hole and the second through hole are different from each other.

In another preferred embodiment, a portion of the outer surface of the first sidewall forms a portion of the inner wall defining the second cavity.

Preferably, the box body assembly further comprises an alternating current connector for electrically connecting the power box and the distribution box, and a first sealing ring is arranged on the alternating current connector; and a second sealing ring is arranged between the power box and the distribution box.

More preferably, a plurality of metal support plates are arranged on the inner side of the second sealing ring, connecting pieces are arranged on the metal support plates, and the power box is fixedly connected with the distribution box through the connecting pieces.

The utility model also adopts the following technical scheme:

the photovoltaic inverter comprises the box body assembly of the photovoltaic inverter, wherein power components of the photovoltaic inverter are arranged in the power box, and an alternating current connector is arranged in the distribution box; the photovoltaic inverter further comprises a radiator arranged on the power box.

Compared with the prior art, the utility model has the following advantages:

according to the box body component of the photovoltaic inverter, a large amount of heat can be generated when the power box works, condensation water vapor in the power box can be prevented from being diffused to the power box through the waterproof ventilation valve, the heat radiating area can be effectively increased, and the heat of the power box can be partially diffused to the power box. The electromagnetic shielding cover is arranged above the waterproof ventilation valve, so that electromagnetic interference between the two cavities can be effectively blocked, and the ventilation through holes on the waterproof ventilation valve and the electromagnetic shielding cover ensure communication between the first cavity and the second cavity. The photovoltaic inverter provided by the utility model has the advantages that electromagnetic interference of the first cavity and the second cavity is avoided, air circulation between the first cavity and the second cavity is effectively ensured, the problem of higher temperature in the power box is rapidly solved, the manufacturing cost is reduced, and the operation efficiency and the product quality are greatly improved.

Drawings

In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a front view of a photovoltaic inverter according to an embodiment of the present utility model;

fig. 2 is a perspective view of a photovoltaic inverter according to an embodiment of the present utility model at a viewing angle;

fig. 3 is a perspective view of a photovoltaic inverter according to an embodiment of the present utility model at a viewing angle, wherein the first cavity and the second cavity are exposed;

fig. 4 is a perspective view of a photovoltaic inverter according to an embodiment of the present utility model at a viewing angle, wherein the first and second cavities are exposed and the cables and electromagnetic shielding cover are not shown;

fig. 5 is a perspective view of a photovoltaic inverter according to an embodiment of the present utility model at another viewing angle;

fig. 6 is a schematic view of a power distribution box according to an embodiment of the present utility model;

FIG. 7 is a schematic illustration of an electromagnetic shield according to an embodiment of the present utility model;

fig. 8 is a perspective view of the waterproof and breathable valve.

Wherein,

1. a power box; 11. a first cavity; 12. a first sidewall;

2. a distribution box; 21. a second cavity; 22. an electromagnetic shield; 221. a ventilation through hole; 222. a main body portion; 223. a cable fixing member; 2231. a locking part; 2232. a protruding portion; 225. a hemming section; 23. a wiring port; 24. a wire outlet; 25. a second sidewall; 251. a second through hole;

3. waterproof ventilation valve; 31. a body; 32. a nut;

4. a fastener; 5. a cable; 6. an ac connector; 7. a second seal ring; 9. a connecting piece; 10. a metal support plate; 101. a heat sink.

Detailed Description

Preferred embodiments of the present utility model will be described in detail below with reference to the attached drawings so that the advantages and features of the present utility model can be more easily understood by those skilled in the art. The description of these embodiments is provided to assist understanding of the present utility model, but is not intended to limit the present utility model. In addition, technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

The embodiment provides a photovoltaic inverter, which includes a box assembly, and the box assembly is described in detail below.

Referring to fig. 1 to 8, the box assembly includes a power box 1, a distribution box 2 located outside the power box 1, a radiator 101 provided on the power box 1, an ac connector 6, and an electromagnetic shield 22. The heat sink 101 is used to dissipate heat emitted from the power box 1. The power box 1 comprises a mounting circuit board, a switch, a power device and the like, and the power box 1 is a key structure of the photovoltaic inverter and can generate a large amount of heat during operation, so that the temperature in the power box 1 is higher. The distribution box 2 is internally provided with a plurality of cables 5, the distribution box 2 is used for connecting alternating current generated by a photovoltaic inverter with a power grid through an alternating current connector 6 so as to output the alternating current, and the power box 1 and the distribution box 2 are fastened together. One side of the ac connector 6 is used to connect components in the power box 1, and the other side is connected to the cable 5 and output to the power grid.

Further, the power box 1 is provided with a first cavity 11 and a first side wall 12, the power box 2 is connected to the first side wall 12, the power box 2 is provided with a second cavity 21, a first through hole for communicating the first cavity 11 with the second cavity 21 is formed in the first side wall 12, and a waterproof ventilation valve 3 is arranged in the first through hole. The waterproof and breathable valve 3 is a waterproof and breathable member that allows air to pass therethrough but water vapor cannot pass therethrough. Referring to fig. 8, the waterproof and breathable valve 3 includes a body 31, a nut 32, and a gasket provided between the body 31 and the nut 32.

Specifically, the waterproof and breathable valve 3 has a specification of M40. The waterproof ventilation valve 3 realizes the ventilation of the power box 1 and the distribution box 2, so that the heat of the power box 1 can be partially diffused to the distribution box 2 and dissipated through the distribution box 2, and the water vapor transmission between the two cavities can be prevented. In this embodiment, the power box 1 and the distribution box 2 are two boxes that are independently arranged, the distribution box 2 has a second side wall 25 opposite to the first side wall 12, the first side wall 12 and the second side wall 25 are fixedly connected, a second through hole 251 is formed in the second side wall 25, and the waterproof ventilation valve 3 is arranged in the first through hole and the second through hole 251; the apertures of the first and second through holes 251 are different from each other. Specifically, the diameter of the first through hole is 40mm, and the diameter of the second through hole is 55mm. In other embodiments, a portion of the outer surface of the first sidewall 12 may be a portion that forms an inner wall defining the second cavity 21, a portion of the boundary of the second cavity 21 being defined by a portion of the first sidewall 12.

A second sealing ring 7 is arranged between the power box 1 and the distribution box 2, and the alternating current connector 6 is positioned in the second sealing ring 7. In this embodiment, the second sealing ring 7 is a conductive sealing ring, which not only can play a role in waterproof, but also can reduce overflow of electromagnetic waves. In other embodiments, the second sealing ring 7 may also only function as a waterproof. Referring to fig. 5, a plurality of metal support plates 10 are provided on the inner side of the second seal ring 7, and a connecting member 9 is provided on the metal support plates 10, and the power box 1 and the distribution box 2 are fixedly connected through the connecting member 9. The metal support board 10 can also play a certain electromagnetic shielding effect.

The electromagnetic shield 22 of the present embodiment is located in the second cavity 21 and houses the waterproof and ventilation valve 3. The electromagnetic shield 22 is a metal pentahedron. On the one hand, the electromagnetic shielding cover 22 can block electromagnetic interference between the first cavity 11 and the second cavity 21, and on the other hand, the electromagnetic shielding cover 22 plays a role in supporting the cable 5 and optimizing the wiring problem of the distribution box 2. The electromagnetic shield 22 is provided with a plurality of ventilation through holes 221 allowing air to pass freely therethrough, and the ventilation through holes 221 are circular holes. The aperture of the ventilation through-hole 221 is less than 5mm, and further, the aperture of the ventilation through-hole 221 is 2-4mm, and more specifically, the aperture of the ventilation through-hole 221 is 3mm. The first cavity 11 and the second cavity 21 are communicated with the ventilation through hole 221 through the waterproof ventilation valve 3, so that the heat dissipation area of the power box 1 is increased.

Further, as shown in fig. 3 and 7, the electromagnetic shielding cover 22 includes an open end and a folded portion 225 that is folded from the open end to the periphery, screw vias are formed in the folded portion 225, and the plurality of fasteners 4 penetrate through the screw vias to fixedly connect the power box 1 and the distribution box 2. A plurality of wiring ports 23 and an outlet port 24 are arranged in the distribution box 2, and the electromagnetic shielding cover 22 is arranged between the wiring ports 23 and the outlet port 24, and the wiring ports 23 are connected with the alternating current connector 6. Because the ac wires in the distribution box 2 are thicker, the cable 5 can shake in the second cavity 21 greatly, the assembly difficulty is increased, and the sealing of the outlet 24 is not facilitated, so that the sealing is invalid, and a plurality of cable fixing pieces 223 for fixing the cable 5 are arranged on the electromagnetic shielding cover 22. The cable fixing member 223 is connected to the electromagnetic shield 22 by the fastener 4, and the cable 5 passes between the fastener 4 and the electromagnetic shield 22.

Further, the cable fixture 223 is provided on the electromagnetic shield 22 so as to be staggered. In particular, in the present embodiment, the number of the cable fixtures 223 is four. Further, the cable fixing member 223 includes a locking portion 2231 and a protruding portion 2232 upwardly arched with respect to the locking portion 2231, and the locking portion 2231 is fixedly connected with the electromagnetic shielding case 22 by a plurality of fastening members 4, thereby effectively ensuring smooth installation of the cable 5. Specifically, the fastener 4 is a screw. The protrusion 2232 and the locking portion 2231 form a space through which the cable 5 passes.

The ac connector 6 is used for outputting the ac generated by the power box 1 to the distribution box 2 to realize electrical connection between the power box 1 and the distribution box 2, wherein one part of the ac connector 6 is positioned in the power box, and the other part of the ac connector 6 is positioned in the distribution box 2. The ac connector 6 is provided with a first sealing ring (not shown in the figure), and the tightness around the power box 1 and the distribution box 2 is ensured by the first sealing ring and the second sealing ring 7.

Aiming at the prior large-power distributed photovoltaic inverter, the power box 1 and the distribution box 2 are generally included, and the power box 1 and the distribution box 2 are respectively provided with independent and closed cavities, so that heat is difficult to transmit between the two cavities; most of the ac connector 6 is wired without tightening measures, which results in low efficiency in wiring, the wire without tightening is easy to shake, a large lateral pressure is formed on the wire connection port 23, and the sealing failure of the wire connection port 24 is easy to cause. According to the embodiment, under the conditions that materials such as a radiator and a fan are not added (high cost) and the appearance of an inverter is not changed, the communication between the power box 1 and the distribution box 2 is realized, the inner volume of a cavity is effectively increased, and the problem of high temperature in the power box 1 is rapidly solved; the electromagnetic shielding cover 22 effectively tightens the outgoing line of the alternating current connector 6, reduces the lateral pressure of the cable 5 to the outgoing line port 24 of the distribution box, improves the wiring stability and improves the operation efficiency.

Further, the box body assembly of this embodiment is through setting up waterproof ventilative valve 3 in order to realize power case 1 and block terminal 2 intercommunication, this can increase whole dc-to-ac converter cavity volume space, the effectual area that has increased is favorable to further reducing the temperature in the power case 1, waterproof ventilative valve 3 can prevent simultaneously that power case 1 from producing a small amount of condensation steam diffusion to block terminal 2 because of the hot and cold alternation in daytime and night, guarantees the drying of block terminal 2. The electromagnetic shield 22 can block electromagnetic interference between the first cavity 11 and the second cavity 21, and simultaneously provides stable fixing guarantee for wiring of the ac connector 6. Therefore, the box body component solves the temperature rise problem and the wiring problem of the distribution box 2 while not changing the appearance of the inverter, reduces the comprehensive manufacturing cost and greatly improves the operation efficiency and the product quality.

As used in this specification and in the claims, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus. The term "and/or" as used herein includes any combination of one or more of the associated listed items.

It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly or indirectly fixed or connected to the other feature. Further, the descriptions of the upper, lower, left, right, etc. used in the present utility model are merely with respect to the mutual positional relationship of the constituent elements of the present utility model in the drawings.

The above-described embodiments are provided for illustrating the technical concept and features of the present utility model, and are intended to be preferred embodiments for those skilled in the art to understand the present utility model and implement the same according to the present utility model, not to limit the scope of the present utility model. All equivalent changes or modifications made according to the principles of the present utility model should be construed to be included within the scope of the present utility model.

Claims (10)

1. The box body assembly of the photovoltaic inverter comprises a power box and a distribution box positioned at the outer side of the power box, wherein the power box is provided with a first cavity and comprises a first side wall, the distribution box is connected to the first side wall and is provided with a second cavity, and the box assembly is characterized in that a first through hole for communicating the first cavity with the second cavity is formed in the first side wall, and a waterproof ventilation valve is arranged in the first through hole; the box assembly further comprises an electromagnetic shielding cover, the electromagnetic shielding cover is arranged inside the waterproof ventilation valve cover, a plurality of ventilation through holes are formed in the electromagnetic shielding cover, and the aperture of each ventilation through hole is smaller than 5mm.

2. The housing assembly of claim 1, wherein the vent aperture is 2-4mm.

3. The housing assembly of claim 1, wherein the electromagnetic shield is positioned within the second cavity, and wherein a cable mount for securing the cable is provided on the electromagnetic shield.

4. A cabinet assembly according to claim 3, wherein the cable fixture is attached to the electromagnetic shield by a fastener, and the cable passes between the fastener and the electromagnetic shield.

5. A cabinet assembly according to claim 3, wherein the cable fixing member includes a locking portion fixedly connected to the electromagnetic shield by a fastener and a protruding portion upwardly arched with respect to the locking portion, the protruding portion and the locking portion forming a space through which the cable passes; the cable fixing pieces are arranged on the electromagnetic shielding cover in a staggered mode.

6. The box assembly according to claim 1, wherein the power box and the distribution box are two boxes which are independently arranged, the distribution box is provided with a second side wall opposite to the first side wall, the first side wall and the second side wall are fixedly connected, a second through hole is formed in the second side wall, and the waterproof ventilation valve is arranged in the first through hole and the second through hole; the apertures of the first through hole and the second through hole are different from each other.

7. The tank assembly of claim 1, wherein a portion of the outer surface of the first sidewall forms a portion of an inner wall defining the second cavity.

8. The cabinet assembly of claim 1, further comprising an ac connector electrically connecting the power box and the distribution box, the ac connector having a first seal ring thereon; and a second sealing ring is arranged between the power box and the distribution box.

9. The box assembly of claim 8, wherein a plurality of metal support plates are arranged on the inner side of the second sealing ring, connecting pieces are arranged on the metal support plates, and the power box and the distribution box are fixedly connected through the connecting pieces.

10. A photovoltaic inverter, characterized by comprising a box assembly of the photovoltaic inverter of any one of claims 1 to 9, the power box having power components of the photovoltaic inverter disposed therein, the distribution box having ac connectors disposed therein; the photovoltaic inverter further comprises a radiator arranged on the power box.