A direct current circuit breaker

Abstract

This utility model relates to the field of circuit breaker technology, and particularly to a DC circuit breaker, comprising a housing, an operating device, a moving contact, a first stationary contact, a second stationary contact, and an arc-extinguishing device. The housing is hollow, with first mounting holes extending vertically through the left and right ends for mounting wires. A second mounting hole is located at the top of the housing, through which the operating device passes. The operating device controls the opening and closing of the DC circuit breaker. The moving contact is fixedly connected to one end of the operating device. The first stationary contact passes through the first mounting hole at the left end of the housing, and the second stationary contact passes through the first mounting hole at the right end of the housing. The arc-extinguishing device is fixedly connected to the inner bottom end of the housing. The arc-extinguishing device is located inside the housing, reducing its size and saving considerable space. Simultaneously, the operating device enables the DC circuit breaker to operate with consistent and rapid opening and closing movements of the moving contact and the first stationary contact.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a DC circuit breaker. Background Technology

[0002] With the rapid development of new energy power generation, rail transit, electric vehicles, and energy storage systems, the application scale of DC power systems is constantly expanding, placing higher demands on the breaking capacity, reliability, and compactness of DC circuit breakers. As a key protection device in DC systems, DC circuit breakers need to interrupt fault currents and effectively extinguish arcs within milliseconds to avoid equipment damage and system paralysis. However, traditional DC circuit breakers are limited by the characteristic that DC current has no natural zero-crossing point, making it difficult to extinguish arcs quickly, especially when interrupting high voltages, where problems such as contact erosion and low arc-extinguishing efficiency are particularly prominent.

[0003] In existing technologies, arc-extinguishing devices mostly rely on magnetic blow-out coils or air-blowing arc-extinguishing structures. While these can enhance the arc stretching speed, they suffer from drawbacks such as large size and response delay, making them unsuitable for the installation requirements of high-density power distribution scenarios. For example, solutions using multi-stage magnetic blow-out coils require a large amount of axial space, while air-blowing structures rely on high-pressure air sources, increasing system complexity and maintenance costs. Furthermore, traditional DC circuit breakers often employ asymmetrical layouts or lateral wiring designs for their stationary contacts, resulting in uneven current distribution and redundant wiring space. In confined distribution cabinets, this can easily cause cable interference, affecting breaking stability. The mechanical linkage design of the operating mechanism also has shortcomings. For instance, single-stage spring drives are prone to fluctuations in opening speed due to mechanical backlash, affecting the consistency of contact separation. Utility Model Content

[0004] The purpose of this invention is to provide a DC circuit breaker to solve the problems existing in the prior art.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A DC circuit breaker, comprising:

[0007] The outer casing is hollow, and has a first through-hole at its left and right ends for mounting electrical wires. A second mounting hole is located at the top of the outer casing.

[0008] An operating device, which is disposed in the second mounting hole, is used to control the opening and closing of the DC circuit breaker;

[0009] A moving contact, which is fixedly connected to one end of the operating device;

[0010] The first stationary contact is inserted into the first mounting hole at the left end of the housing;

[0011] The second stationary contact passes through the first mounting hole at the right end of the housing;

[0012] And an arc-extinguishing device, which is fixedly connected to the inner bottom end of the outer shell.

[0013] By adopting the above technical solution, the arc extinguishing device is placed inside the casing, which reduces the size of the arc extinguishing device and saves a lot of space. At the same time, the operating device enables the DC circuit breaker to achieve consistent rapid opening and closing actions of the moving contact and the first stationary contact.

[0014] In a further embodiment, the operating device includes:

[0015] The handle is rotatably connected to the second mounting hole of the housing;

[0016] The first link is rotatably connected to the bottom end of the handle via a pivot. A movable contact is rotatably connected to the bottom end of the first link, and a first round rod is provided at the left end of the first link.

[0017] The second link is rotatably connected to the outer casing, the first round rod is located at the bottom end of the second link, and the second link is located at the rear end of the first link;

[0018] The third link is rotatably connected to the inner right end of the housing, and the right end of the second link is in contact with the third link;

[0019] A sleeve is fixedly connected to the right end of the moving contact. A first spring is fitted onto the sleeve. A push module is inserted inside the sleeve. The right end of the push module is slidably connected to the moving contact. The push module is used to push the moving contact to contact the first stationary contact.

[0020] In a further embodiment, the arc-extinguishing device includes:

[0021] An arc-extinguishing chamber is fixedly connected to the bottom of the operating device. The arc-extinguishing chamber is hollow and its left end is completely open.

[0022] Multiple arc-extinguishing grids are provided, all of which have the same structure and are arranged at intervals from top to bottom inside the arc-extinguishing chamber.

[0023] In a further embodiment, the pushing module includes:

[0024] A disc, the disc being hollow, having a through-hole at the left end of the disc, and the disc being slidably mounted inside a sleeve;

[0025] The second round rod is fixedly connected to the inner right end of the disc, and the second round rod is fitted with a second spring;

[0026] A push rod is fixedly connected to the right end of the second round rod, and the push rod is slidably installed with the moving contact.

[0027] In a further embodiment, the first stationary contact includes;

[0028] The first contact sleeve is fixedly connected to the first mounting hole at the left end of the housing, and the first contact sleeve is used to connect the wire.

[0029] The first connecting plate has one end fixedly connected to the right end of the first contact sleeve, and the other end of the first connecting plate is located at the left end of the moving contact.

[0030] In a further embodiment, the second stationary contact includes:

[0031] The second contact sleeve is fixedly connected to the first mounting hole at the right end of the housing, and the second contact sleeve is used to connect the wire.

[0032] The second connecting plate has one end fixedly connected to the left end of the second contact sleeve, and the other end of the second connecting plate is fixedly connected to the sleeve.

[0033] In a further embodiment, the front end of the moving contact is provided with a plurality of isolation plates, which are fixedly connected to the inner wall of the housing and are used to isolate the influence of the electric arc on the housing.

[0034] By adopting the above technical solution, when it is necessary to connect the linear circuit breaker, the handle is turned, and the first connecting rod rotatably connected to the bottom of the handle moves. The first connecting rod pushes the second connecting rod to move, and the right end of the second connecting rod contacts the third connecting rod, thereby pushing the third connecting rod to rotate. This causes the bottom end of the third connecting rod to push the disc to move to the left. The second round rod is fixedly connected to the right end of the disc. The second round rod sleeved inside the disc pushes the push rod at the left end to move to the left, causing the moving contact, which is rotatably connected to the bottom end of the first connecting rod, to rotate around the first connecting rod. This causes the moving contact to contact the first connecting plate of the first stationary contact, thereby connecting the circuit. When the DC circuit breaker needs to be disconnected, the handle is turned back, causing the first link to rotate and return to its original position. The second link does not receive the thrust from the first link, and the third link does not receive the thrust from the second link. The spring sleeved on the second round rod applies a force to the right to the disc, causing the push rod to move to the right, separating the moving contact from the first connecting plate, thereby disconnecting the DC circuit breaker. When switching the DC circuit breaker switch, if an arc is generated, the arc extinguishing device attracts the arc to the arc extinguishing chamber, where the arc extinguishing grid divides the arc into multiple small arc segments, thereby extinguishing the arc.

[0035] In summary, this utility model has the following beneficial effects:

[0036] 1. When the linear circuit breaker needs to be connected, the handle is turned, and the first link, which is rotatably connected to the bottom of the handle, moves. The first link pushes the second link to move, and the right end of the second link contacts the third link, thereby pushing the third link to rotate. This causes the bottom end of the third link to push the disc to the left. The second rod is fixedly connected to the right end of the disc. The second rod, which is sleeved inside the disc, pushes the push rod at the left end to move to the left, causing the moving contact, which is rotatably connected to the bottom end of the first link, to rotate around the first link. This causes the moving contact to contact the first connecting plate of the first stationary contact, thereby connecting the DC circuit breaker. When the DC circuit breaker needs to be disconnected, the handle is turned back, causing the first link to rotate and return to its original position. The second link does not receive the thrust from the first link, and the third link does not receive the thrust from the second link. The spring sleeved on the second round rod applies a force to the right to the disc, causing the push rod to move to the right, causing the moving contact to separate from the first connecting plate, thereby disconnecting the DC circuit breaker. When switching the DC circuit breaker switch, if an arc is generated, the arc extinguishing device attracts the arc to the arc extinguishing chamber, and the arc is divided into multiple small arc segments by the arc extinguishing grid, thereby extinguishing the arc. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0038] Figure 2 This is a schematic diagram of the operating device structure of this utility model;

[0039] Figure 3 This is a schematic diagram of the overall structure of this utility model with the outer shell removed;

[0040] Figure 4 This is a schematic diagram of the structure of the pushing module of this utility model;

[0041] Figure 5 This is a schematic diagram of the arc-extinguishing device of this utility model.

[0042] In the diagram, 1. Outer casing; 2. Operating device; 21. Handle; 22. First connecting rod; 23. First round rod; 24. Second connecting rod; 25. Third connecting rod; 26. Sleeve; 27. First spring; 28. Push module; 281. Disc; 282. Second round rod; 283. Push rod; 3. Moving contact; 4. First stationary contact; 41. First contact sleeve; 42. First connecting plate; 5. Second stationary contact; 51. Second contact sleeve; 52. Second connecting plate; 6. Arc extinguishing device; 61. Arc extinguishing chamber; 62. Arc extinguishing grid; 7. Isolation plate; 8. Second spring. Detailed Implementation

[0043] The present invention will be further described in detail below with reference to the accompanying drawings.

[0044] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to the attached figures. Figure 1 In this specification, the terms "bottom surface" and "top surface," "inner" and "outer" refer to the direction toward or away from the geometry of a specific component. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "a plurality of" means two or more, unless otherwise explicitly and specifically defined by the direction of the center.

[0045] Example 1:

[0046] like Figure 1-5 As shown, a DC circuit breaker includes a housing 1, an operating device 2, a moving contact 3, a first stationary contact 4, a second stationary contact 5, and an arc-extinguishing device 6. The housing 1 is hollow, and the left and right ends of the housing 1 have through first mounting holes for installing wires. The top of the housing 1 has a second mounting hole, and the operating device 2 passes through the second mounting hole. The operating device 2 is used to control the opening and closing of the DC circuit breaker. The moving contact 3 is fixedly connected to one end of the operating device 2. The first stationary contact 4 passes through the first mounting hole at the left end of the housing 1, and the second stationary contact 5 passes through the first mounting hole at the right end of the housing 1. The arc-extinguishing device 6 is fixedly connected to the inner bottom end of the housing 1.

[0047] The operating device 2 includes a handle 21, a first connecting rod 22, a second connecting rod 24, a third connecting rod 25, and a sleeve 26. The handle 21 is rotatably connected to the second mounting hole of the housing 1. The first connecting rod 22 is rotatably connected to the bottom end of the handle 21 via a rotating shaft. A movable contact 3 is rotatably connected to the bottom end of the first connecting rod 22. A first round rod 23 is provided at the left end of the first connecting rod 22. The second connecting rod 24 is rotatably connected to the housing 1. The first round rod 23 is located at the bottom end of the second connecting rod 24. The second connecting rod 24 is located at the rear end of the first connecting rod 22. The third connecting rod 25 is rotatably connected to the inner right end of the housing 1. The right end of the second connecting rod 24 is in contact with the third connecting rod 25. The sleeve 26 is fixedly connected to the right end of the movable contact 3. A first spring 27 is sleeved on the sleeve 26. A push module 28 is inserted inside the sleeve 26. The right end of the push module 28 is slidably connected to the movable contact 3. The push module 28 is used to push the movable contact 3 to contact the first stationary contact 4.

[0048] The pushing module 28 includes a disc 281, a second round rod 282, and a push rod 283. The disc 281 is hollow and has a through-hole on its left end. The disc 281 is slidably installed inside the sleeve 26. The second round rod 282 is fixedly connected to the inner right end of the disc 281 and is fitted with a second spring 8. The push rod 283 is fixedly connected to the right end of the second round rod 282 and is slidably installed with the moving contact 3.

[0049] The first stationary contact 4 includes a first contact sleeve 41 and a first connecting plate 42. The first contact sleeve 41 is fixedly connected to the first mounting hole at the left end of the housing 1 and is used to connect wires. One end of the first connecting plate 42 is fixedly connected to the right end of the first contact sleeve 41, and the other end of the first connecting plate 42 is located at the left end of the moving contact 3. The second stationary contact 5 includes a second contact sleeve 51 and a second connecting plate 52. The second contact sleeve 51 is fixedly connected to the first mounting hole at the right end of the housing 1 and is used to connect wires. One end of the second connecting plate 52 is fixedly connected to the left end of the second contact sleeve 51, and the other end of the second connecting plate 52 is fixedly connected to the sleeve 26. The front end of the moving contact 3 is provided with multiple isolation plates 7, which are fixedly connected to the inner wall of the housing 1 and are used to isolate the influence of electric arc on the housing 1.

[0050] Specific implementation process: When it is necessary to connect the linear circuit breaker, the handle 21 is turned, and the first connecting rod 22, which is rotatably connected to the bottom end of the handle 21, moves. The first connecting rod 22 pushes the second connecting rod 24 to move, and the right end of the second connecting rod 24 contacts the third connecting rod 25, thereby pushing the third connecting rod 25 to rotate. This causes the bottom end of the third connecting rod 25 to push the disc 281 to move to the left. The second round rod 282 is fixedly connected to the right end of the disc 281. The second round rod 282, which is sleeved inside the disc 281, pushes the push rod 283 at the left end to move to the left, causing the moving contact 3, which is rotatably connected to the bottom end of the first connecting rod 22, to rotate around the first connecting rod 22. This causes the moving contact 3 to contact the first connecting plate 42 of the first stationary contact 4. This connects the DC circuit breaker. When the DC circuit breaker needs to be disconnected, the handle 21 is pulled back, causing the first link 22 to rotate and return to its original position. The second link 24 does not receive the thrust of the first link 22, so the third link 25 does not receive the thrust of the second link 24. The spring sleeved on the second round rod 282 applies a force to the right to the disc 281, causing the push rod 283 to move to the right, causing the moving contact 3 to separate from the first connecting plate 42, thereby disconnecting the DC circuit breaker. When switching the DC circuit breaker switch, if an arc is generated, the arc extinguishing device 6 attracts the arc into the arc extinguishing chamber 61, and the arc is divided into multiple small arc segments by the arc extinguishing grid 62, thereby extinguishing the arc.

[0051] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0052] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A direct current circuit breaker, characterized by, include: The outer casing (1) is hollow. The left and right ends of the outer casing (1) have through-holes for mounting wires. The top of the outer casing (1) has a second mounting hole. Operating device (2), which is installed in the second mounting hole, is used to control the opening and closing of the DC circuit breaker; The moving contact (3) is fixedly connected to one end of the operating device (2); The first stationary contact (4) is inserted into the first mounting hole at the left end of the housing (1); The second stationary contact (5) is inserted into the first mounting hole at the right end of the housing (1); And an arc extinguishing device (6), which is fixedly connected to the inner bottom end of the outer shell (1).

2. The DC circuit breaker according to claim 1, characterized in that: The operating device (2) includes: Handle (21), the handle (21) being rotatably connected to the second mounting hole of the housing (1); The first link (22) is rotatably connected to the bottom end of the handle (21) via a pivot. The bottom end of the first link (22) is rotatably connected to a moving contact (3). The left end of the first link (22) is provided with a first round rod (23). The second link (24) is rotatably connected to the outer shell (1), the first round rod (23) is located at the bottom end of the second link (24), and the second link (24) is located at the rear end of the first link (22); The third link (25) is rotatably connected to the inner right end of the outer casing (1), and the right end of the second link (24) is in contact with the third link (25); The sleeve (26) is fixedly connected to the right end of the moving contact (3). The sleeve (26) is fitted with a first spring (27). A push module (28) is inserted inside the sleeve (26). The right end of the push module (28) is slidably connected to the moving contact (3). The push module (28) is used to push the moving contact (3) to contact the first stationary contact (4).

3. The DC circuit breaker according to claim 1, characterized in that: The arc-extinguishing device (6) includes: Arc-extinguishing chamber (61), which is fixedly connected to the bottom end of the operating device (2), is hollow and has its left end completely open; The arc extinguishing grid (62) is provided in multiple ways. The arc extinguishing grids (62) have the same structure and are arranged at intervals from top to bottom inside the arc extinguishing chamber (61).

4. The DC circuit breaker according to claim 2, characterized in that: The pushing module (28) includes: The disc (281) is hollow and has a through-hole at the left end. The disc (281) is slidably installed in the sleeve (26). The second round rod (282) is fixedly connected to the inner right end of the disc (281), and the second round rod (282) is fitted with a second spring (8); A push rod (283) is fixedly connected to the right end of the second round rod (282), and the push rod (283) is slidably installed with the moving contact (3).

5. The DC circuit breaker according to claim 2, characterized in that: The first stationary contact (4) includes; The first contact sleeve (41) is fixedly connected to the first mounting hole at the left end of the outer shell (1). The first contact sleeve (41) is used to connect the wire. The first connecting plate (42) is fixedly connected at one end to the right end of the first contact sleeve (41), and the other end of the first connecting plate (42) is located at the left end of the moving contact (3).

6. The DC circuit breaker according to claim 2, characterized in that: The second stationary contact (5) includes: The second contact sleeve (51) is fixedly connected to the first mounting hole at the right end of the outer casing (1). The second contact sleeve (51) is used to connect the wire. The second connecting plate (52) has one end fixedly connected to the left end of the second contact sleeve (51) and the other end fixedly connected to the sleeve (26).

7. The DC circuit breaker according to claim 2, characterized in that: The front end of the moving contact (3) is provided with multiple isolation plates (7), which are fixedly connected to the inner wall of the outer shell (1). The isolation plates (7) are used to isolate the electric arc from the outer shell (1).

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