Protective cover and string type photovoltaic inverter comprising same

Abstract

The utility model relates to a protective cover and a string type photovoltaic inverter comprising the same. The protective cover is used for the string type photovoltaic inverter, the string type photovoltaic inverter comprises a bottom plate, a plurality of wiring terminals are arranged on the bottom plate, the protective cover is fixedly installed on the bottom plate, a rectangular box body is defined by the protective cover and the bottom plate, and the wiring terminals are arranged in the box body; the protective cover is provided with a through hole, and an AC cable and a DC branch cable pass through the through hole and are connected with the wiring terminal. A rectangular box body is defined by the protective cover and a bottom plate of the string type photovoltaic inverter, and the wiring terminal is arranged in the box body, so that a direct current terminal is effectively prevented from falling off to the ground, and fire hazards caused by electric arcs generated at the moment when the direct current terminal of the inverter falls off are avoided.

Description

Technical Field

[0001] The utility model relates to the field of photovoltaic power generation, in particular to a protective cover and a string-type photovoltaic inverter comprising the protective cover. Background Art

[0002] Photovoltaic cells are devices that convert solar energy into electrical energy, converting sunlight into direct current through the photovoltaic effect. A string photovoltaic inverter is a photovoltaic cell group consisting of multiple photovoltaic cells connected in series, and then the series photovoltaic cell group is connected to an inverter. In a string photovoltaic inverter, after multiple photovoltaic cells are connected in series, the voltage output can be increased, and the current fluctuation can be reduced, thereby improving the stability and efficiency of the system.

[0003] The inverter is mainly responsible for converting the DC power output by the photovoltaic battery group into AC power and outputting it to the power grid. The photovoltaic battery group is connected to the DC terminal at the bottom of the inverter through connecting wires and DC terminals.

[0004] Most string photovoltaic inverters are installed in large-scale ground photovoltaic power stations, mostly in mountainous and flat areas with lush weeds. However, the DC terminals at the bottom of existing string photovoltaic inverters do not have any protective facilities. When installed outdoors, they are easily damaged and detached by external forces such as livestock, or the DC terminals are affected by their own quality, operating time, etc., and melt and detach due to overheating. In both cases, an arc will be generated at the moment when the DC terminal detaches, which will seriously ignite the weeds on the ground and cause fire hazards.

[0005] Therefore, it is necessary to provide a string photovoltaic inverter that solves the above-mentioned technical and safety hazard problems. Summary of the invention

[0006] The technical problem to be solved by the utility model is that the DC terminals at the bottom of the existing string-type photovoltaic inverters have no protective facilities and are easily affected by external forces and the body, causing the DC terminals to fall off and generate arcs.

[0007] In order to solve the above technical problems, according to one aspect of the utility model, a protective cover is provided, the protective cover is used for a string photovoltaic inverter, the string photovoltaic inverter comprises a bottom plate, a plurality of wiring terminals are arranged on the bottom plate, wherein the protective cover is fixedly mounted on the bottom plate, the protective cover and the bottom plate form a rectangular box, and the wiring terminals are arranged in the box;

[0008] The protective cover is provided with a through hole, and the AC cable and the DC branch cable pass through the through hole to be connected with the wiring terminal.

[0009] Preferably, the protective cover is mounted on the base plate by screws.

[0010] Preferably, the protective cover comprises a bottom cover, which is arranged parallel to the lower side of the bottom plate, and a groove is provided on the bottom cover, and the AC cable and the DC branch cable pass through the groove to be connected to the wiring terminal.

[0011] Furthermore, the number of the grooves is two, namely a first groove and a second groove. The AC cable passes through the first groove to be connected to the wiring terminal, and the DC branch cable passes through the second groove to be connected to the wiring terminal.

[0012] Preferably, the protective cover also includes a left side wall, a right side wall and a rear wall, the left side wall and the top of the right side wall are installed on the bottom plate by screws, the left side wall, the rear wall and the right side wall are connected in sequence, and the left side wall, the rear wall and the right side wall are respectively vertically fixedly connected to the bottom cover.

[0013] Furthermore, the protective cover also includes a front door, and the front door is rotatably connected to the left side wall.

[0014] Furthermore, the front door is connected to the left side wall via a hinge.

[0015] Preferably, the front door is connected to the right side wall via a door latch.

[0016] According to another aspect of the utility model, a string photovoltaic inverter including the protective cover is provided.

[0017] Preferably, a wire threading tube is provided on the periphery of the AC cable, and the wire threading tube passes through the through hole.

[0018] Compared with the prior art, the protective cover and the string photovoltaic inverter including the protective cover provided in the embodiment of the utility model can achieve at least the following beneficial effects:

[0019] First, the protective cover and the bottom plate form a rectangular box, and the wiring terminals are arranged in the box, which effectively prevents the DC terminals from falling off and falling to the ground, and avoids fire caused by arcs generated when the DC terminals of the inverter fall off;

[0020] Second, the front door can be opened and closed, and the cover plate is provided with a first groove and a second groove. The AC cable passes through the first groove, and the DC branch cable passes through the second groove, which is convenient for subsequent troubleshooting. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present utility model, rather than limiting the present utility model.

[0022] Figure 1 A schematic diagram of the structure of a string photovoltaic inverter provided in this embodiment;

[0023] Figure 2 for Figure 1 The schematic diagram of the structure of the protective cover of the string photovoltaic inverter shown in FIG.

[0024] Figure 3 for Figure 2 Schematic diagram of the planar structure of the bottom cover of the protective cover is shown. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Unless otherwise defined, the technical or scientific terms used herein shall have the common meanings understood by persons with ordinary skills in the field to which the utility model belongs. The words "first", "second" and similar words used in the patent application specification and claims of the utility model do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantity limitation, but indicate the existence of at least one.

[0027] refer to Figures 1 to 3 This embodiment provides a string-type photovoltaic inverter, which includes a main body 1 and a protective cover 2. A plurality of wiring terminals are arranged on a bottom plate 11 of the main body 1. The protective cover 2 is used to protect the wiring terminals. The protective cover 2 is fixedly mounted on the bottom plate 11. Preferably, the protective cover 2 is mounted on the bottom plate 11 by screws.

[0028] The protective cover 2 and the bottom plate 11 form a rectangular box, and the wiring terminals are arranged in the box to prevent external forces from directly contacting the wiring terminals. At the same time, the wiring terminals fall directly into the box when they fall off, effectively preventing the DC terminals from falling off and falling to the ground, and avoiding fires caused by arcs generated when the DC terminals of the inverter fall off. Preferably, the protective cover 2 is made of a strong metal material to prevent external forces from acting on the wiring terminals to the greatest extent.

[0029] The protective cover is provided with a through hole, and the AC cable 3 and the DC branch cable 4 pass through the through hole to connect with the wiring terminal without affecting the connection of other lines of the wiring terminal. Preferably, a threading tube is provided on the periphery of the AC cable 3, and the threading tube passes through the through hole. The DC branch cable 4 includes multiple cables.

[0030] Specifically, the protective cover 2 includes a bottom cover 21, which is arranged parallel to the lower side of the bottom plate 11. A groove is formed on the bottom cover 21, and the AC cable 3 and the DC branch cable 4 pass through the groove to be connected to the wiring terminal.

[0031] Preferably, there are two grooves, namely a first groove 211 and a second groove 212. The AC cable 3 passes through the first groove 211 to connect with the wiring terminal, and the DC branch cable 4 passes through the second groove 212 to connect with the wiring terminal. The size and shape of the first groove 211 and the second groove 212 are designed according to actual needs.

[0032] The protective cover also includes a left side wall, a right side wall and a rear wall. The left side wall and the top of the right side wall are installed on the bottom plate 11 by screws. The left side wall, the rear wall and the right side wall are connected in sequence. The left side wall, the rear wall and the right side wall are respectively vertically fixedly connected to the bottom cover 21.

[0033] The protective cover also includes a front door, which is rotatably connected to the left side wall, preferably connected to the left side wall by a hinge. The front door is connected to the right side wall by a door buckle, and can be padlocked as needed to ensure safety, so that only staff can open it.

[0034] The method of using the protective cover is as follows: first open the front door, install the left side wall and the top of the right side wall to the bottom plate 11 by screws, pass the AC cable 3 through the first groove 211, collect the multiple DC branch cables 4 and pass them through the second groove 212, and close the front door. The structural design of the protective cover facilitates the later removal work.

[0035] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

Claims

1. A protective cover, the protective cover is used for a string photovoltaic inverter, the string photovoltaic inverter comprises a bottom plate, a plurality of connection terminals are arranged on the bottom plate, characterized in that: The protective cover is fixedly mounted on the bottom plate, the protective cover and the bottom plate form a rectangular box, and the wiring terminal is arranged in the box; The protective cover is provided with a through hole, and the AC cable and the DC branch cable pass through the through hole to be connected with the wiring terminal.

2. The protective cover according to claim 1, characterized in that: The protective cover is mounted on the bottom plate by screws.

3. The protective cover according to claim 1, characterized in that: The protective cover comprises a bottom cover, which is arranged parallel to the lower side of the bottom plate. A groove is provided on the bottom cover, and the AC cable and the DC branch cable pass through the groove to be connected with the wiring terminal.

4. The protective cover according to claim 3, characterized in that: There are two grooves, namely a first groove and a second groove. The AC cable passes through the first groove to be connected to the wiring terminal, and the DC branch cable passes through the second groove to be connected to the wiring terminal.

5. The protective cover according to claim 3, characterized in that: The protective cover also includes a left side wall, a right side wall and a rear wall. The left side wall and the top of the right side wall are installed on the bottom plate by screws. The left side wall, the rear wall and the right side wall are connected in sequence. The left side wall, the rear wall and the right side wall are respectively vertically fixedly connected to the bottom cover.

6. The protective cover according to claim 5, characterized in that: The protective cover also includes a front door, and the front door is rotatably connected to the left side wall.

7. The protective cover according to claim 6, characterized in that: The front door is connected to the left side wall via a hinge.

8. The protective cover according to claim 6, characterized in that: The front door is connected to the right side wall via a door buckle.

9. A string photovoltaic inverter, characterized in that: Comprising the protective cover as described in any one of claims 1 to 8.

10. The string photovoltaic inverter according to claim 9, characterized in that: A wire threading tube is arranged on the periphery of the AC cable, and the wire threading tube passes through the through hole.

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