Short circuit structure and circuit breaker

Abstract

The utility model relates to a short-circuit structure and a circuit breaker. The short-circuit structure comprises a base arranged at the bottom of a base of the circuit breaker, a short-circuit bar arranged on the base and a line bank, a plurality of groove bodies are arranged on the base in parallel, and static contact bridges and movable contact bridges are arranged in the groove bodies; the short-circuit bar comprises a short-circuit bar main body obliquely arranged on the base, and a movable contact bridge connecting end and a static contact bridge connecting end which are respectively arranged at two ends of the short-circuit bar main body, and the movable contact bridge connecting end and the static contact bridge connecting end respectively penetrate through the bottom of the base and are connected with the corresponding static contact bridge and the movable contact bridge in the adjacent groove bodies. Compared with the prior art, on the basis of the three-pole alternating-current circuit breaker, the three-pole alternating-current circuit breaker can be used as a direct-current circuit breaker by changing part of the line bank and adding the short-circuit bar and the base at the bottom of the base of the circuit breaker, so that most of alternating-current and direct-current parts can be commonly used, and the cost is greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers and relates to a short-circuit structure and a circuit breaker. Background Art

[0002] With the increasing development of infrastructure for renewable energy generation and other applications, DC switches are finding a wider range of applications. For low-voltage electrical equipment manufacturers, developing a new DC switch requires significant investment, a long development cycle, and slow results. Therefore, most companies are adapting existing AC switches to meet the wiring requirements of DC systems, employing multiple series connections to achieve higher rated voltages to meet DC system requirements. This involves switching from mold opening to mold repair and adding smaller components, significantly reducing costs and time.

[0003] Chinese patent CN219286311U discloses a three-pole DC circuit breaker cascade structure, comprising a breaker body. The upper end of the breaker body is provided with input terminals for power input, and the lower end of the breaker body is provided with output terminals for supplying power to the load. The breaker body houses a three-pole DC control switch for controlling the transmission of power between the input and output terminals. This patent overcomes existing issues with conventional DC circuit breakers, such as the high production cost and complex wiring that can be prone to errors during installation, caused by the addition of shorting bars at the circuit breaker terminals.

[0004] However, because the shorting mechanism is built into the circuit breaker, the base and conductive parts are not compatible with AC circuit breakers. Furthermore, the component structure is complex, especially the conductive parts, with numerous bends, making it suitable only for low-current busbars. Summary of the Invention

[0005] The purpose of the utility model is to provide a short-circuit structure and a circuit breaker, which are used to realize the commonality of most parts of AC and DC, thereby greatly reducing costs.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A first aspect of the present invention provides a short-circuit structure, comprising a base provided at the bottom of a base of a circuit breaker, a short-circuit bar provided on the base, and a terminal bar;

[0008] A plurality of slots are arranged in parallel on the base, and a static contact bridge and a dynamic contact bridge are arranged in the slots;

[0009] The shorting bar includes a shorting bar body obliquely arranged on the base, and a moving contact bridge connection end and a static contact bridge connection end respectively arranged at both ends of the shorting bar body, the moving contact bridge connection end and the static contact bridge connection end respectively pass through the bottom of the base and are connected with the corresponding static contact bridge and moving contact bridge in the adjacent slot body; that is, the moving contact bridge connection end passes through the bottom of the base and is electrically connected to the moving contact bridge in a slot body, specifically can be connected to the soft connection of the moving contact bridge; the static contact bridge connection end passes through the bottom of the base and is connected to the static contact bridge in the adjacent slot body;

[0010] The terminal block is connected to the moving contact bridge in the slot body that is not short-circuited.

[0011] Furthermore, the wiring bank is a straight line.

[0012] Furthermore, a phase partition is provided between adjacent slots, and mounting grooves are respectively provided on both sides of the phase partition located at the terminal block mounting position, and insulating blocks are provided in the mounting grooves.

[0013] Furthermore, a terminal block installation position is provided in the slot body, and the terminal block is a bent block, one end of which is provided at the terminal block installation position in one of the adjacent slot bodies, and the other end is bent and extended toward the terminal block installation position of the other slot body, and is connected to the moving contact bridge in the slot body.

[0014] Furthermore, the short-circuit structure further includes an insulating cover, and the insulating cover is respectively provided on both ends of the bent row.

[0015] Furthermore, the insulating cover is provided on the end portion of the bent row connected to the moving contact bridge; the insulating cover is provided on the other end portion of the bent row and insulates and separates the end portion from the moving contact bridge connection end.

[0016] Furthermore, the terminal block is provided with wiring holes and / or fixing threaded holes, and the fixing threaded holes are used to connect to the base via screws.

[0017] Furthermore, the moving contact bridge connection end is arranged in an inverted L-shape at one end of the shorting bar body and is connected to the shorting bar body by corresponding screws; and / or,

[0018] The static contact bridge and the shorting bar are connected by screws that are sequentially provided through the static contact bridge, the shorting bar body, and the connection end of the static contact bridge; and / or,

[0019] A protective cover is further provided at the connection end of the static contact bridge, and the protective cover is provided outside the static contact bridge and the connection end of the static contact bridge.

[0020] Furthermore, a shorting bar placement slot is provided on the base, and the shorting bar is embedded in the shorting bar placement slot.

[0021] A second aspect of the present invention provides a circuit breaker, comprising the short-circuit structure as described above.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1) The present invention can be used as a DC circuit breaker based on a three-pole AC circuit breaker by modifying some of the terminal blocks and adding a shorting block and a base at the bottom of the circuit breaker base. This allows most parts of the AC and DC circuit breakers to be shared, greatly reducing costs.

[0024] 2) The DC circuit breaker output terminal in this utility model has two wiring methods, which can be completed by simply replacing the terminal block, and can meet the wiring needs of different customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a circuit breaker with a short-circuit structure in an embodiment;

[0026] Figure 2 It is a structural diagram of the short-circuit bar;

[0027] Figure 3 Schematic diagram of the three-dimensional structure of a circuit breaker with a short-circuit structure (using a bent row and not showing the operating mechanism and moving contact) in an embodiment;

[0028] Figure 4 This is a schematic diagram of the main structure of a circuit breaker with a short-circuit structure in an embodiment (the terminal block adopts a bent block and the operating mechanism and the moving contact are not shown);

[0029] Figure 5 Schematic diagram of the structure of the bent row;

[0030] Figure 6 for Figure 4 Middle AA section;

[0031] Figure 7 This is a schematic diagram of the main structure of a circuit breaker with a short-circuit structure (the terminal block is arranged in a straight line and the operating mechanism and the moving contact are not shown) in an embodiment;

[0032] Figure 8 for Figure 7 Middle BB cross section;

[0033] Figure 9 This is a schematic diagram of the assembly structure of the short-circuit bar and the base;

[0034] Figure 10 A schematic diagram of a circuit breaker short circuit (the terminal block adopts a straight row) and terminal blocks in the embodiment;

[0035] Figure 11A schematic diagram of a circuit breaker short circuit (the terminal block adopts a bent block) and terminal blocks in the embodiment;

[0036] Description of the marks in the figure:

[0037] 1-base, 101-mounting slot, 21-straight row, 2101-straight row fixing threaded hole, 2102-straight row wiring hole, 22-bent row, 2201-bent row fixing threaded hole, 2202-bent row wiring hole, 3-shorting row, 31-moving contact bridge connection end, 3101-base threaded hole, 3102-body threaded hole, 32-shorting row body, 33-static contact bridge connection end, 4-base, 401-shorting row placement slot, 402-base mounting hole, 403-hexagonal slot, 5-static contact bridge, 501-wiring terminal, 6-insulating cover, 7-protective cover, 8-static contact bridge screw, 9-moving contact bridge connection screw, 10-insulating insert. DETAILED DESCRIPTION

[0038] The following embodiments are implemented based on the above technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0040] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0041] Example

[0042] like Figure 1 The circuit breaker shown in the figure has a base 1 and a short-circuit structure. Three slots are arranged in parallel on the base 1. A set of static contact bridges 5 and moving contact bridges are arranged in the slots. They are marked as A, B, and C phases respectively. At the same time, the soft connection points of the moving contacts are marked as A2, B2, and C2 respectively, and the terminal blocks are marked as A1, B1, and C1 respectively. Figure 10 、 Figure 11 As shown; the short-circuit structure includes a base 4 provided at the bottom of the base 1 of the circuit breaker, a short-circuit bar 3 provided on the base 4, and a terminal bar; as Figure 2 、 Figure 9As shown, the shorting bar 3 includes a shorting bar body 32 obliquely mounted on the base 4, and a moving contact bridge connection 31 and a stationary contact bridge connection 33, respectively, located at either end of the shorting bar body 32. The moving contact bridge connection 31 and the stationary contact bridge connection 33 each pass through the bottom of the base 1 and connect to the corresponding stationary contact bridge 5 and moving contact bridge in the adjacent slot. That is, the moving contact bridge connection 31 passes through the bottom of the base 1 and electrically connects to the moving contact bridge in the phase C slot; the stationary contact bridge connection 33 passes through the bottom of the base 1 and electrically connects to the stationary contact bridge 5 in the phase B slot, forming a current path from C2 to B. Phase A terminal block A1 uses a straight-line connection 21 and is installed in the phase A terminal block mounting position.

[0043] There are two types of terminal blocks in the circuit breaker, namely straight block 21 and bent block 22. The bent block 22 has a structure as follows: Figure 5 When two straight rows 21 are used for the terminal block, the output terminals can be connected to A1 and B1, as shown in the figure. Figure 10 As shown; when the terminal block uses straight row 21 and curved row 22, the curved row 22 is from B2 to C1, and the output terminal can be connected to A1 and C1, as shown Figure 11 shown.

[0044] In some specific embodiments, Figure 7 As shown, the B-phase wiring block B1 adopts a straight-line block 21 and is installed at the B-phase wiring block installation position, and no wiring block is installed at the C-phase wiring block installation position.

[0045] In some specific embodiments, when the B-phase terminal block B1 is arranged in a straight line 21, a phase partition is provided between adjacent slots. Mounting slots 101 are provided on both sides of the phase partition at the terminal block mounting location. Insulating inserts 10 are provided within the mounting slots 101. The insulating material used in the present invention can be any electrical insulating material, such as polyimide.

[0046] In some specific embodiments, Figure 1 、 Figure 3 and Figure 4 As shown, the C-phase wiring block C1 adopts a bent block 22, one end of which is installed at the C-phase wiring block installation position, and the other end is bent and extended toward the B-phase wiring block installation position and connected to the B-phase moving contact soft connection B2.

[0047] In some preferred embodiments, when the C-phase terminal block C1 utilizes a bent bar 22, the shorting structure further includes an insulating cover 6, which is disposed at each end of the bent bar. More specifically, the insulating cover 6 located at the B-phase terminal block mounting position covers the bent bar end from the outside inward, exposing the connection between the bent bar end and the B-phase moving contact. The insulating cover 6 located at the C-phase terminal block mounting position covers the inner side of the bent bar end, insulating and separating the bent bar end from the C-phase moving contact bridge connection end 31 to prevent breakdown between the bent bar 22 and the moving contact bridge connection end 31. Furthermore, the insulating cover 6 serves to encase the bent bar 22, preventing any portion of the bent bar 22 other than the connection portion from being exposed to the outside.

[0048] In some preferred embodiments, a clearance groove is further provided on the phase partition between phase B and phase C to allow the bent row 22 to pass through.

[0049] In some specific embodiments, wiring holes and fixing threaded holes are provided on the wiring block, which are divided into straight wiring holes 2102, curved wiring holes 2202 and straight fixing threaded holes 2101, curved fixing threaded holes 2201 according to the type of the wiring block. The fixing threaded holes are used to connect to the base 1 by screws.

[0050] In some specific embodiments, Figure 6 and Figure 8 As shown, the movable contact bridge connection end 31 is arranged in an inverted L-shape at one end of the shorting bar body 32. The outer end of the movable contact bridge connection end 31 is used for welding flexible connections, and a base threaded hole 3101 is provided at the bend. The movable contact bridge connection end 31 is fixed to the base 1 through the base threaded hole 3101 and the screws that are threadedly connected to the base threaded hole 3101 and the base 1. The inner end of the movable contact bridge connection end 31 is provided with a body threaded hole 3102. The movable contact bridge connection end 31 is connected to the end of the shorting bar body 32 via the movable contact bridge connection screw 9 that is threadedly connected to the body threaded hole 3102.

[0051] The static contact bridge 5 and the shorting bar 3 are connected via static contact bridge screws 8 that pass through the static contact bridge 5 , the shorting bar body 32 , and the static contact bridge connection end 33 in sequence, forming a conductive circuit.

[0052] In some specific embodiments, Figure 3 、 Figure 6 As shown, a protective cover 7 is further provided at the static contact bridge connection end 33 for covering the static contact bridge screw 8 and the connection terminal 501 of the B-phase static contact bridge 5 to prevent user misoperation.

[0053] In some specific embodiments, a shorting bar placement slot 401 having a shape corresponding to the shorting bar 3 is defined on the base 4 , and the shorting bar 3 is embedded in the shorting bar placement slot 401 .

[0054] In some specific embodiments, the base 4 is provided with a plurality of base mounting holes 402. Screws passing through the base mounting holes 402 and threadedly connected to threaded seats on the bottom surface of the base 1 secure the base 4 to the bottom of the base 1, thereby protecting the shorting bar. Furthermore, the base 4 is provided with hexagonal slots 403 for receiving wire nuts, replacing the original nut holders on the circuit breaker body.

[0055] The above description of the embodiments is intended to facilitate understanding and use of the utility model by those skilled in the art. Those skilled in the art will readily be able to make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the utility model is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of this utility model without departing from the scope of this utility model should be within the scope of protection of this utility model.

Claims

1. A short circuit structure, characterized in that: It comprises a base (4) arranged at the bottom of a base (1) of a circuit breaker, a short-circuit bar (3) arranged on the base (4), and a terminal bar; A plurality of slots are arranged in parallel on the base (1), and a static contact bridge (5) and a moving contact bridge are arranged in the slots; The short-circuit bar (3) comprises a short-circuit bar body (32) obliquely arranged on the base (4), and a moving contact bridge connection end (31) and a stationary contact bridge connection end (33) respectively arranged at both ends of the short-circuit bar body (32), wherein the moving contact bridge connection end (31) and the stationary contact bridge connection end (33) respectively pass through the bottom of the base (1) and are connected to the corresponding stationary contact bridge (5) and the moving contact bridge in the adjacent slot body; The terminal block is connected to the moving contact bridge in the slot body that is not short-circuited.

2. The short-circuit structure according to claim 1, characterized in that: The terminal block is a straight-line block.

3. The short-circuit structure according to claim 2, characterized in that: A phase partition is provided between adjacent slot bodies, and mounting grooves are respectively provided on both sides of the phase partition located at the wiring block mounting position, and insulating inserts (10) are provided in the mounting grooves.

4. The short-circuit structure according to claim 1, characterized in that: A terminal block installation position is provided in the slot body, and the terminal block is a bent block. One end of the bent block is provided at the terminal block installation position in one of the adjacent slot bodies, and the other end is bent and extended toward the terminal block installation position of the other slot body and connected to the moving contact bridge in the slot body.

5. The short-circuit structure according to claim 4, characterized in that: The short-circuit structure further comprises an insulating cover (6), and the insulating cover (6) is respectively provided to cover the two ends of the bent row.

6. The short-circuit structure according to claim 5, characterized in that: The insulating cover (6) is located on the end portion of the bent row connected to the moving contact bridge; the insulating cover (6) is located on the other end portion of the bent row and is insulated and separated from the moving contact bridge connection end (31).

7. The short-circuit structure according to claim 6, characterized in that: The terminal block is provided with a wiring hole and / or a fixing threaded hole, and the fixing threaded hole is used to connect the base (1) via screws.

8. The short-circuit structure according to claim 1, characterized in that: The moving contact bridge connection end (31) is arranged upright at one end of the shorting bar main body (32) in an inverted L-shape, and is connected to the shorting bar main body (32) via corresponding screws; and / or, The static contact bridge (5) and the shorting bar (3) are connected by screws sequentially passing through the static contact bridge (5), the shorting bar body (32), and the static contact bridge connection end (33); and / or, A protective cover (7) is further provided at the static contact bridge connection end (33), and the protective cover (7) is provided outside the static contact bridge (5) and the static contact bridge connection end (33).

9. The short-circuit structure according to claim 1, characterized in that: The base (4) is provided with a short-circuit bar placement groove, and the short-circuit bar (3) is embedded in the short-circuit bar placement groove.

10. A circuit breaker, characterized in that: The short-circuit structure comprises the short-circuit structure according to any one of claims 1 to 9.

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