Standby power box

Abstract

The utility model provides a standby power box which comprises a box body and a mounting rack, and a first wiring terminal, a second wiring terminal, a third wiring terminal, a fourth wiring terminal, a time relay, an intermediate relay, a leakage protection circuit breaker and a contactor are assembled in the box body. According to the utility model, the five first wiring terminals are used for connecting the AC side terminals of the three-phase inverter, at the moment, L1, L2, L3, N and PE of the three-phase inverter can be connected into the box body, so that the box body can run off line, the three second wiring terminals are used for connecting the off-grid load, at the moment, L, N and PE of the off-grid load can be connected into the box body, so that the off-line operation of the box body can be realized. Five third wiring terminals are arranged to be used for being connected with the mains supply, at the moment, L1, L2, L3, N and PE of the power grid can be connected into the box body, and therefore the load can take power from the power grid to work in the grid-connected state.

Description

Technical Field

[0001] The utility model relates to the technical field of backup power boxes, in particular to a backup power box. Background Art

[0002] With the development of power technology, a backup box has been installed between the inverter and the grid. The main function of the backup box is to receive power and supply power to the load when the grid fails. For example, when the PV panels and inverter are in off-grid mode, that is, the PV panels and inverter are disconnected from the grid, the backup box can still use the AC power converted by the inverter to provide power to the load. In this way, even if the PV panels and inverter are in off-grid mode, the backup box can still supply power to the load normally.

[0003] However, the backup box currently supports only TN-S, TN-CS, and TT grid types. When the inverter is in a three-phase three-wire system, the backup box cannot be operated offline. Utility Model Content

[0004] The purpose of the present invention is to provide a backup power box to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A backup power box includes a box body and a mounting frame. The box body is equipped with a first terminal, a second terminal, a third terminal, a fourth terminal, a time relay, an intermediate relay, a grounding bar, a leakage protection circuit breaker, and a contactor. A cover plate is fixed to the box body, and one side of the leakage protection circuit breaker passes through the cover plate. The bottom of the box body is provided with a first waterproof terminal, a second waterproof terminal, a third waterproof terminal, and a waterproof breathable valve.

[0007] The leakage protection circuit breaker and the contactor are arranged in the same row, the first terminal, the second terminal, the third terminal, the fourth terminal, the time relay and the intermediate relay are arranged in another row, and the first terminal, the second terminal, the third terminal, the fourth terminal, the time relay and the intermediate relay are arranged below the leakage protection circuit breaker and the contactor.

[0008] Preferably, a box cover is hinged on the surface of the box body, and a buckle lock is installed at the connection between the box cover and the box body.

[0009] Preferably, a connecting seat is vertically fixed to the inner wall of the box body, a threaded hole is provided on the surface of the connecting seat, a screw passes through the surface of the cover plate, and one end of the screw is threadedly connected to the threaded hole.

[0010] Preferably, a hanging bracket is fixedly mounted on the back of the box body, the hanging bracket is hung on the surface of the mounting bracket, and the mounting bracket is fixedly mounted on the surface of the wall.

[0011] Preferably, a bottom bracket is fixedly mounted on the back of the box body, and a surface of the bottom bracket is provided with expansion bolt holes.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] This utility model provides five first wiring terminals for connecting to the AC side terminals of the three-phase inverter. In this case, the L1, L2, L3, N, and PE terminals of the three-phase inverter can all be connected to the box body, thereby enabling the box body to operate offline. Three second wiring terminals are provided for connecting to off-grid loads. In this case, the L, N, and PE terminals of the off-grid loads can all be connected to the box body, thereby enabling the off-grid loads to draw power from the box body. Five third wiring terminals are provided for connecting to the mains power. In this case, the L1, L2, L3, N, and PE terminals of the grid can all be connected to the box body, thereby enabling the loads to draw power from the grid in the grid-connected state. Two fourth wiring terminals are provided for connecting to the inverter communication, transmitting the status signals of the grid power outage and restoration to the inverter. When the grid power is cut off, the inverter switches to the off-grid state and supplies power to the off-grid loads in the backup power mode. When the grid is restored, the loads draw power from the grid and operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the front structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the internal structure of the box body of the utility model;

[0016] Figure 3 This is a schematic diagram of the front structure of the cover plate of the utility model;

[0017] Figure 4 It is a side structural diagram of the utility model;

[0018] Figure 5 This is a schematic diagram of the bottom structure of the utility model;

[0019] Figure 6 It is a schematic diagram of the back structure of the utility model.

[0020] In the figure: 1. Box body; 2. Mounting frame; 3. First terminal; 4. Second terminal; 5. Third terminal; 6. Fourth terminal; 7. Time relay; 8. Intermediate relay; 9. Leakage protection circuit breaker; 10. Contactor; 11. Cover plate; 12. First waterproof terminal; 13. Second waterproof terminal; 14. Third waterproof terminal; 15. Waterproof vent valve; 16. Box cover; 17. Hasp lock; 18. Connecting seat; 19. Threaded hole; 20. Hanging bracket; 21. Bottom bracket; 22. Expansion bolt hole. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0022] See also Figure 1-6 The present invention provides a backup power box, including a box body 1 and a mounting frame 2. The interior of the box body 1 is equipped with a first terminal 3, a second terminal 4, a third terminal 5, a fourth terminal 6, a time relay 7, an intermediate relay 8, a leakage protection circuit breaker 9 and a contactor 10. A cover plate 11 is fixed to the interior of the box body 1, and one side of the leakage protection circuit breaker 9 passes through the cover plate 11. The bottom of the box body 1 is provided with a first waterproof terminal 12, a second waterproof terminal 13, a third waterproof terminal 14 and a waterproof breathable valve 15.

[0023] See also Figure 1 、 2and 3, the first wiring terminals 3 are provided with five, which are used to connect the AC side terminals of the three-phase inverter. At this time, L1, L2, L3, N and PE of the three-phase inverter can all be connected to the box body 1, so that the box body 1 can operate offline, and the second wiring terminals 4 are provided with three, which are used to connect the off-grid load. At this time, L, N and PE of the off-grid load can all be connected to the box body 1, so that the off-grid load can draw power from the box body 1, and the third wiring terminals 5 are provided with five, which are used to connect to the mains. At this time, L1, L2, L3, N and PE of the grid can all be connected to the box body 1, so that the load can draw power from the grid in the grid-connected state. There are two fourth wiring terminals 6, which are used to connect the inverter communication and transmit the status signals of power outage and restoration of the power grid to the inverter. The specification of the time relay 7 is NTE8-B, the specification of the intermediate relay 8 is NJX5 / 2Z(S), the specification of the leakage protection circuit breaker 9 is NB5L-40Y 1P+N C25100mA, and the specification of the contactor 10 is NDC1-2511 AC 220V 3P. The above quantities are all set to 1. There are 1 first waterproof terminal 12 and 1 third waterproof terminal 14, and their specifications are M25 and M12 respectively. There are two second waterproof terminals 13, and their specifications are M32. There is 1 waterproof breathable valve 15, and its specification is M12. Among them, the first waterproof terminal 12 is used to protect the off-grid load port, the two second waterproof terminals 13 are used to protect the grid AC interface and the inverter AC interface respectively, and the third waterproof terminal 14 is used to protect the COM interface.

[0024] A box cover 16 is hinged on the surface of the box body 1 , and a hasp lock 17 is installed at the connection between the box cover 16 and the box body 1 .

[0025] See also Figure 4 The box cover 16 is used to protect the internal components, and the buckle lock 17 is used to connect the box body 1 and the box cover 16.

[0026] A connecting seat 18 is vertically fixed to the inner wall of the box body 1 , and a threaded hole 19 is provided on the surface of the connecting seat 18 . A screw passes through the surface of the cover plate 11 , and one end of the screw is threadedly connected to the threaded hole 19 .

[0027] See also Figure 2 and 3The connection between the cover 11 and the box body 1 can be achieved through screws, threaded holes 19 and connecting seats 18. All components and internal wiring should be below the cover 11, leaving only the operating handle of the leakage protection circuit breaker 9. The cover 11 is tightly combined with the box body 1, and the gap is not greater than 2mm. In addition, the box body 1 as a whole can be made of metal or non-metallic material. If non-metallic material is used, flame retardant material is used, the flame retardant grade is UL94-V0, which meets Rohs requirements, and the overall protection level is not less than IP54. The input and output lines are connected from the bottom in and out, and all input and output lines are connected by plug-in. The surface of the box body 1 and the cover 16 should be covered with a film to prevent scratches and dirt caused by sweat and other reasons.

[0028] A hanging bracket 20 is fixedly installed on the back of the box body 1, and the hanging bracket 20 is hung on the surface of the mounting bracket 2. The mounting bracket 2 is fixedly installed on the surface of the wall. A bottom bracket 21 is fixedly installed on the back of the box body 1, and an expansion bolt hole 22 is provided on the surface of the bottom bracket 21.

[0029] See also Figure 5 and 6 The box body 1 is installed in a hanging manner as a whole and can be installed on the wall. It is necessary to ensure that the side of the box body 1 with the inlet and outlet holes is facing downward. It is prohibited to install it tilted left and right, and the front and back tilt should not exceed 30°. First, fix the mounting bracket 2 to the wall with expansion bolts, and then hang the hanging bracket 20 on the top of the mounting bracket 2, so that the box body 1 naturally droops under its own gravity. At this time, the box body 1 can drive the bottom bracket 21 to contact the wall. At this time, the bottom bracket 21 can continue to be fixed to the wall with expansion bolts. The installation of the box body 1 is now completed.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A backup power box, comprising a box body (1) and a mounting frame (2), characterized in that: The box body (1) is internally equipped with a first terminal (3), a second terminal (4), a third terminal (5), a fourth terminal (6), a time relay (7), an intermediate relay (8), a leakage protection circuit breaker (9) and a contactor (10); a cover plate (11) is fixed inside the box body (1); one side of the leakage protection circuit breaker (9) passes through the cover plate (11); the bottom of the box body (1) is provided with a first waterproof terminal (12), a second waterproof terminal (13), a third waterproof terminal (14) and a waterproof breathable valve (15); The leakage protection circuit breaker (9) and the contactor (10) are arranged in the same row, the first wiring terminal (3), the second wiring terminal (4), the time relay (7), the intermediate relay (8) and the grounding bar are arranged in another row, and the first wiring terminal (3), the second wiring terminal (4), the third wiring terminal (5), the fourth wiring terminal (6), the time relay (7), the intermediate relay (8) and the grounding bar are arranged below the leakage protection circuit breaker (9) and the contactor (10).

2. The backup power box according to claim 1, characterized in that: A box cover (16) is hinged on the surface of the box body (1), and a buckle lock (17) is installed at the connection between the box cover (16) and the box body (1).

3. The backup power box according to claim 1, characterized in that: A connecting seat (18) is vertically fixed to the inner wall of the box body (1), a threaded hole (19) is provided on the surface of the connecting seat (18), a screw is passed through the surface of the cover plate (11), and one end of the screw is threadedly connected to the threaded hole (19).

4. The backup power box according to claim 1, characterized in that: A hanging bracket (20) is fixedly mounted on the back of the box body (1), the hanging bracket (20) is hung on the surface of the mounting bracket (2), and the mounting bracket (2) is fixedly mounted on the surface of the wall.

5. The backup power box according to claim 4, characterized in that: A bottom bracket (21) is fixedly mounted on the back of the box body (1), and an expansion bolt hole (22) is provided on the surface of the bottom bracket (21).

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