An arc lengthening structure, frame circuit breaker and disconnector

Abstract

The utility model discloses an arc lengthening structure, frame circuit breaker and isolating switch, including circuit breaker main shaft, install the contact head of movable contact head and with movable contact head corresponding setting static contact, transmission connection between circuit breaker main shaft and contact head support, set up between movable contact head and static contact insulation piece, and insulation piece is configured as through linkage mechanism and movable contact head opening and closing action form the association, make when movable contact head with contact head support rotation and with static contact open and close, insulation piece is driven with contact head support homodromous rotation through linkage mechanism, and enters into the opening and closing path of movable contact head and static contact. The utility model discloses insulation piece enters the opening and closing path of movable contact head and static contact and can lengthen arc, is favorable to arc extinguishing, simultaneously, utilize the insulation performance of insulation piece, can effectively prevent arc in movable contact head and static contact between reignition, thereby improve the breaking capacity of circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to an arc elongation structure, a frame circuit breaker, and a disconnecting switch. Background Technology

[0002] During the opening process of a frame circuit breaker, an electric arc is generated between the moving and stationary contacts. Since the arc is conductive, if it cannot be extinguished in time, it will affect the circuit breaker's making and breaking capacity. Based on this, in the existing technology, an arc-extinguishing chamber structure is generally set above the moving and stationary contacts to extinguish the arc generated when the moving and stationary contacts open. However, in some new energy applications, higher requirements are placed on the breaking capacity and rated voltage of the frame circuit breaker. The existing technical solution that simply uses an arc-extinguishing chamber structure for arc extinguishing is not effective enough to meet the high requirements of new energy applications for increased breaking capacity and rated voltage, resulting in certain limitations in its use. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides an arc elongation structure, which mainly solves the technical problem that the existing technical solution of simply using an arc-extinguishing chamber structure for arc extinguishing is ineffective and therefore cannot meet the high requirements of breaking capacity and rated voltage improvement in the field of new energy applications.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] An arc elongation structure is applied in a frame circuit breaker or disconnector, including a circuit breaker main shaft, a contact support on which a moving contact is installed, and a stationary contact corresponding to the moving contact. The circuit breaker main shaft and the contact support are connected by a drive. An insulating element is provided between the moving contact and the stationary contact, and the insulating element is configured to be associated with the opening action of the moving and stationary contacts through a linkage mechanism. When the moving contact rotates with the contact support to open with the stationary contact, the insulating element is driven by the linkage mechanism to rotate in the same direction as the contact support and enter the opening and closing path of the moving and stationary contacts to elongate the arc.

[0006] Furthermore, the insulating component is configured to be associated with the closing action of the moving and stationary contacts through a linkage mechanism, so that when the contact support drives the moving and stationary contacts to close, the insulating component is reset and rotated by the linkage mechanism and exits the opening and closing path of the moving and stationary contacts so that the moving contact can perform the closing operation normally.

[0007] Furthermore, the insulating components are configured to be linked with the circuit breaker spindle or contacts via a linkage mechanism, thereby becoming associated with the opening and closing actions of the moving and stationary contacts.

[0008] Furthermore, it also includes a contact support bracket, on which the contact support is rotatably connected. The insulating element is rotatably connected to a support structure via an insulating element shaft. The linkage mechanism includes a driving gear and a driven gear. The driving gear is connected to the circuit breaker main shaft, and the driven gear is coaxially connected to the insulating element. The insulating element is configured to link with the circuit breaker main shaft through the meshing of the driving gear and the driven gear. When the contact support rotates clockwise relative to the contact support bracket under the drive of the circuit breaker main shaft, the circuit breaker main shaft drives the driving gear to rotate and drives the driven gear to rotate clockwise, causing the insulating element to flip and descend clockwise until it is below the stationary contact, thus exiting the opening and closing path between the moving contact and the stationary contact, thereby creating space so that the moving contact can perform normal closing operation. When the contact support rotates counterclockwise relative to the contact support bracket under the drive of the circuit breaker main shaft, the driving gear drives the driven gear to rotate counterclockwise, causing the insulating element to flip and rise counterclockwise and enter the opening and closing path between the moving contact and the stationary contact to lengthen the arc.

[0009] Furthermore, the insulating component includes a partition, with side plates connected to both sides of the partition. The side plates are fixedly connected to the rotating shaft of the insulating component, and the driven gear is fixedly connected to the rotating shaft of the insulating component and meshes with the driving gear.

[0010] Furthermore, it also includes a contact support bracket, on which the contact support is rotatably connected. The linkage mechanism includes a first link and a second link. The insulating component is rotatably connected to a support structure via the first link. The two ends of the second link are rotatably connected to the contact support and the first link, respectively. The insulating component is configured to form a linkage with the contact support through the cooperation of the first and second links. When the contact support rotates clockwise relative to the contact support bracket under the drive of the circuit breaker main shaft, the insulating component is rotated clockwise and lowered under the drive of the linkage mechanism until it exits the opening and closing path between the moving and stationary contacts, thus creating space for the moving contact to perform normal closing operation. When the contact support rotates counterclockwise relative to the contact support bracket under the drive of the circuit breaker main shaft, the insulating component is rotated counterclockwise and raised under the drive of the linkage mechanism and enters the opening and closing path between the moving and stationary contacts to lengthen the arc.

[0011] Furthermore, the insulating component includes a partition plate, a side plate is connected to one side of the partition plate, a support rod extends from the contact support bracket, the side plate is rotatably connected to the support rod through a first connecting rod, and the rotation center of the insulating component is configured to be located on the back side of the moving contact at the limit position of the tripping position.

[0012] Furthermore, a blocking base plate is extended on the insulating component. The blocking base plate is configured to block the bottom channel of the stationary contact when the moving and stationary contacts are open, so as to prevent the stationary contact from breaking down with the moving contact through the bottom channel.

[0013] Based on the same inventive concept, this utility model also provides a frame circuit breaker, including the above-mentioned arc elongation structure.

[0014] Based on the same inventive concept, this utility model also provides an isolating switch, including the above-mentioned arc elongation structure.

[0015] The above technical solution has the following advantages or beneficial effects:

[0016] In the arc elongation structure, frame circuit breaker, and disconnecting switch described in this utility model, the insulating component is movably disposed between the moving contact and the stationary contact. The movements of the insulating component and the moving contact do not interfere with each other, and are associated with the opening action of the moving and stationary contacts through a linkage mechanism. During the opening process of the frame circuit breaker, an electric arc is generated between its moving and stationary contacts. The insulating component is configured to rotate in the same direction as the relative moving contact during the opening process and enter the opening and closing path of the moving and stationary contacts. The insulating component pushes and elongates the electric arc to facilitate its extinguishing. Meanwhile, since the insulating component is configured to rotate in the same direction as the contact support under the drive of the linkage mechanism, this arrangement makes the overall structure of the arc elongation structure simple and compact, and the assembly process is relatively quick and convenient, which is conducive to improving assembly efficiency. Moreover, the structural layout is reasonable, and it will not increase the depth of the product or the amount of copper used in the product. In addition, since the insulating component is positioned between the moving contact and the stationary contact during opening, the insulating performance of the insulating component can effectively prevent the arc from reigniting between the moving contact and the stationary contact, thereby improving the breaking capacity of the circuit breaker. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the arc elongation structure of Embodiment 1 of this utility model in the open state.

[0018] Figure 2 This is a schematic diagram of the arc elongation structure of Embodiment 1 of this utility model at another angle in the open state.

[0019] Figure 3 This is a schematic diagram of the arc elongation structure of Embodiment 1 of this utility model in the closed state.

[0020] Figure 4 This is a schematic diagram of the arc elongation structure of Embodiment 1 of this utility model at another angle in the closed state.

[0021] Figure 5 This is a schematic diagram of the arc elongation structure of Embodiment 2 of this utility model in the open state.

[0022] Figure 6 This is a schematic diagram of the arc elongation structure of Embodiment 2 of this utility model at another angle in the open state.

[0023] Figure 7 This is a schematic diagram of the arc elongation structure of Embodiment 2 of this utility model in the closed state.

[0024] Figure 8 This is a schematic diagram of the arc elongation structure of Embodiment 2 of this utility model at another angle in the closed state.

[0025] Labeling Explanation: 1. Circuit breaker main shaft, 2. Contact support, 3. Stationary contact, 4. Insulating component, 5. Linkage mechanism, 6. Contact support bracket, 21. Moving contact, 41. Partition plate, 42. Side plate, 43. Blocking base plate, 51. Driving gear, 52. Driven gear, 53. First connecting rod, 54. Second connecting rod, 61. Support rod. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Example 1

[0029] Please refer to the appendix. Figure 1 To be continued Figure 4One embodiment of this utility model provides an arc elongation structure for use in a frame circuit breaker or disconnector (this embodiment uses a frame circuit breaker as an example). It includes a circuit breaker main shaft 1, a contact support 2 on which a moving contact 21 is installed, and a stationary contact 3 corresponding to the moving contact 21. The circuit breaker main shaft 1 and the contact support 2 are connected by a transmission. An insulating member 4 is provided between the moving contact 21 and the stationary contact 3. The rotation center of the insulating member 4 is located on the back side of the moving contact 21 at the limit position of the opening (the side away from the moving contact 21 where the moving contact point is located is the back of the moving contact). The insulating member 4 is configured to be associated with the opening action of the moving and stationary contacts through a linkage mechanism 5. When the moving contact 21 opens with the stationary contact 3 as the contact support 2 rotates, the insulating member 4 rotates in the same direction as the contact support 2 through the linkage mechanism 5 and enters the opening and closing path of the moving contact 21 and the stationary contact 3 to elongate the arc. Understandably, in this embodiment, the insulating component 4 is movably disposed between the moving contact 21 and the stationary contact 3. The movements of the insulating component 4 and the moving contact 21 do not interfere with each other, and are associated with the opening action of the moving and stationary contacts through the linkage mechanism 5. During the opening process of the frame circuit breaker, an electric arc is generated between its moving contact 21 and stationary contact 3. The insulating component 4 is configured to rotate in the same direction as the relative moving contact 21 during the opening process and enter the opening and closing path between the moving contact 21 and the stationary contact 3. The insulating component 4 pushes and lengthens the electric arc to facilitate its extinguishing. At the same time, Since the insulating component 4 is configured to rotate in the same direction as the contact support 2 under the drive of the linkage mechanism 5, this arrangement makes the overall structure of the arc elongation structure simple and compact, and the assembly process is relatively quick and convenient, which is conducive to improving assembly efficiency. Moreover, the structural layout is reasonable, and it will not increase the depth of the product or the amount of copper used in the product. In addition, since the insulating component 4 is positioned between the moving contact 21 and the stationary contact 3 when the circuit is opened, the insulating performance of the insulating component 4 can effectively prevent the arc from reigniting between the moving contact 21 and the stationary contact 3, thereby improving the breaking capacity of the circuit breaker.

[0030] Please refer to the appendix. Figure 1 To be continued Figure 4 In one preferred embodiment, the insulating member 4 is configured to be associated with the closing action of the moving and stationary contacts via a linkage mechanism 5. When the contact support 2 drives the moving contact 21 to close with the stationary contact 3, the insulating member 4 is reset and rotated by the linkage mechanism 5, exiting the opening and closing path of the moving contact 21 and the stationary contact 3 so that the moving contact 21 can perform a normal closing operation. The insulating member 4 is configured to be linked with the circuit breaker main shaft 1 or the contact support 2 via the linkage mechanism 5, thereby associating with the opening and closing actions of the moving and stationary contacts. In this embodiment, the insulating member 4 is associated with the closing action of the moving and stationary contacts via the linkage mechanism 5, so that when the moving contact 21 approaches the stationary contact 3 to close, the insulating member 4 automatically avoids it, allowing the moving contact 21 to normally contact the stationary contact 3 to form a closed state.

[0031] Please refer to the appendix. Figure 1 To be continued Figure 4 In one preferred embodiment, the device further includes a contact support bracket 6, with the contact support 2 rotatably connected to the contact support bracket 6. The insulating element 4 is rotatably connected to a support structure via an insulating element shaft. The linkage mechanism 5 includes a driving gear 51 and a driven gear 52. The driving gear 51 is connected to the circuit breaker main shaft 1, and the driven gear 52 is coaxially connected to the insulating element 4. Preferably, the driven gear 52 is mounted on the insulating element shaft. The insulating element 4 is configured to form a linkage with the circuit breaker main shaft 1 through the meshing of the driving gear 51 and the driven gear 52. This allows the contact support 2 to rotate clockwise relative to the contact support bracket 6 under the drive of the circuit breaker main shaft 1 (in this application, clockwise and counterclockwise are relative; specifically, in this embodiment, the moving contact is located on the left, and the stationary contact is located on the right; when closing...). The insulating element 4 rotates clockwise toward the stationary contact. However, in other embodiments, if the relative positions of the moving contact and the stationary contact are reversed, the insulating element 4 will also rotate counterclockwise when closing. The circuit breaker main shaft 1 drives the drive gear 51 to rotate and drives the driven gear 52 to rotate clockwise, causing the insulating element 4 to flip and descend clockwise until it is below the stationary contact 3, thereby exiting the opening and closing path of the moving contact 21 and the stationary contact 3, thus creating space so that the moving contact 21 can perform the closing operation normally. When the contact support 2 rotates counterclockwise relative to the contact support bracket 6 under the drive of the circuit breaker main shaft 1, the drive gear 51 drives the driven gear 52 to rotate counterclockwise, causing the insulating element 4 to flip and rise counterclockwise and enter the opening and closing path of the moving contact 21 and the stationary contact 3 to lengthen the arc.

[0032] Please refer to the appendix. Figure 1 To be continued Figure 4 In one preferred embodiment, the insulating member 4 includes a partition 41, with side plates 42 connected to both sides of the partition 41. The side plates 42 are fixedly connected to the rotating shaft of the insulating member, and the driven gear 52 is fixedly connected to the rotating shaft of the insulating member and meshes with the driving gear 51. Further, a blocking base plate 43 extends from the insulating member 4. The blocking base plate 43 is configured to block the bottom channel of the stationary contact 3 when the moving and stationary contacts are open, preventing the stationary contact 3 from breaking through the moving contact 21 via the bottom channel. In this embodiment, during the opening process, the blocking base plate 43 on the insulating member 4 moves accordingly to the bottom of the stationary contact 3, thereby using the blocking base plate 43 to close the bottom channel of the stationary contact 3 to form a blockage. This prevents the stationary contact 3 from breaking through the moving contact 21 via the bottom channel, further improving the breaking capacity of the circuit breaker.

[0033] Please refer to the appendix. Figure 1 To be continued Figure 4 An embodiment of this utility model also provides a frame circuit breaker, including the above-mentioned arc elongation structure.

[0034] One embodiment of this utility model also provides an isolating switch, including the above-described arc elongation structure.

[0035] Example 2

[0036] Please refer to the appendix. Figure 5 To be continued Figure 8 The difference between this embodiment and embodiment one is that it also includes a contact support bracket 6. The contact support 2 is rotatably connected to the contact support bracket 6. The linkage mechanism 5 includes a first link 53 and a second link 54. The insulating member 4 is rotatably connected to a support structure through the first link 53. The two ends of the second link 54 are respectively rotatably connected to the contact support 2 and the first link 53. The insulating member 4 is configured to form a linkage with the contact support 2 through the cooperation of the first link 53 and the second link 54, so that when the contact support 2 is on the circuit breaker main shaft 1 When the contact support 6 rotates clockwise under the drive of the main shaft 1, the insulating part 4 rotates clockwise and descends until it is below the stationary contact 3, thus exiting the opening and closing path between the moving contact 21 and the stationary contact 3, thereby making way so that the moving contact 21 can perform normal closing operation. When the contact support 2 rotates counterclockwise relative to the contact support 6 under the drive of the main shaft 1 of the circuit breaker, the insulating part 4 rotates counterclockwise and rises under the drive of the linkage mechanism 5 and enters the opening and closing path between the moving contact 21 and the stationary contact 3 to lengthen the arc.

[0037] Please refer to the appendix. Figure 5 To be continued Figure 8 In one preferred embodiment, the insulating member 4 includes a partition 41, with a side plate 42 connected to one side of the partition 41. A support rod 61 extends from the contact support bracket 6, and the side plate 42 is rotatably connected to the support rod 61 via a first connecting rod 53. However, those skilled in the art will understand that in other embodiments, the support structure may also be a support structure independent of the contact support bracket 6 inside the frame circuit breaker, or a support structure extending from the contact support bracket 6, or a base formed on the inner wall of the circuit breaker housing, as long as it can stably support the first connecting rod 53 at the corresponding position.

[0038] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model. Therefore, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. An arc elongation structure, applied in a frame circuit breaker or disconnector, characterized in that: The circuit breaker includes a main shaft (1), a contact support (2) on which a moving contact (21) is installed, and a stationary contact (3) corresponding to the moving contact (21). The main shaft (1) and the contact support (2) are connected by a transmission. The circuit breaker is characterized in that an insulating element (4) is provided between the moving contact (21) and the stationary contact (3). The insulating element (4) is configured to be associated with the opening action of the moving and stationary contacts through a linkage mechanism (5). When the moving contact (21) opens with the stationary contact (3) as the contact support (2) rotates, the insulating element (4) rotates in the same direction as the contact support (2) through the linkage mechanism (5) and enters the opening and closing path of the moving contact (21) and the stationary contact (3) to lengthen the arc.

2. The arc elongation structure according to claim 1, characterized in that: The insulating component (4) is configured to be associated with the closing action of the moving and stationary contacts through the linkage mechanism (5), so that when the contact support (2) drives the moving contact (21) and the stationary contact (3) to close, the insulating component (4) is reset and rotated by the linkage mechanism (5) and exits the opening and closing path of the moving contact (21) and the stationary contact (3) so that the moving contact (21) can perform the closing operation normally.

3. The arc elongation structure according to claim 2, characterized in that: The insulating component (4) is configured to be linked with the circuit breaker spindle (1) or contact support (2) via the linkage mechanism (5), thereby being associated with the opening and closing actions of the moving and stationary contacts.

4. The arc elongation structure according to claim 3, characterized in that: It also includes a contact support bracket (6), the contact support (2) is rotatably connected to the contact support bracket (6), the insulating member (4) is rotatably connected to a support structure through the insulating member shaft, and the linkage mechanism (5) includes a driving gear (51) and a driven gear (52). The driving gear (51) is connected to the circuit breaker main shaft (1), and the driven gear (52) is coaxially connected to the insulating member (4). The insulating member (4) is configured to form a linkage with the circuit breaker main shaft (1) through the meshing of the driving gear (51) and the driven gear (52), so that when the contact support (2) rotates clockwise relative to the contact support bracket (6) under the drive of the circuit breaker main shaft (1), the contact... The circuit breaker main shaft (1) drives the drive gear (51) to rotate and drives the driven gear (52) to rotate clockwise, causing the insulating part (4) to rotate clockwise and descend until it is below the stationary contact (3), thus exiting the opening and closing path of the moving contact (21) and the stationary contact (3), thereby creating space so that the moving contact (21) can perform normal closing operation. When the contact support (2) rotates counterclockwise relative to the contact support bracket (6) under the drive of the circuit breaker main shaft (1), the drive gear (51) drives the driven gear (52) to rotate counterclockwise, causing the insulating part (4) to rotate counterclockwise and rise and enter the opening and closing path of the moving contact (21) and the stationary contact (3) to lengthen the arc.

5. The arc elongation structure according to claim 4, characterized in that: The insulating component (4) includes a partition (41), with side plates (42) connected to both sides of the partition (41). The side plates (42) are fixedly connected to the rotating shaft of the insulating component, and the driven gear (52) is fixedly connected to the rotating shaft of the insulating component and meshes with the driving gear (51).

6. The arc elongation structure according to claim 3, characterized in that: It also includes a contact support bracket (6), the contact support (2) is rotatably connected to the contact support bracket (6), and the linkage mechanism (5) includes a first link (53) and a second link (54). The insulating member (4) is rotatably connected to a support structure through the first link (53), and the two ends of the second link (54) are rotatably connected to the contact support (2) and the first link (53) respectively. The insulating member (4) is configured to form a linkage with the contact support (2) through the cooperation of the first link (53) and the second link (54), so that when the contact support (2) is driven by the circuit breaker main shaft (1), the contact support (2) is linked to the contact support (2). When the contact support bracket (6) rotates clockwise, the insulating part (4) rotates clockwise and descends under the drive of the linkage mechanism (5) until it is below the stationary contact (3), thus exiting the opening and closing path of the moving contact (21) and the stationary contact (3), thereby making way so that the moving contact (21) can perform normal closing operation. When the contact support (2) rotates counterclockwise relative to the contact support bracket (6) under the drive of the circuit breaker main shaft (1), the insulating part (4) rotates counterclockwise and rises under the drive of the linkage mechanism (5) and enters the opening and closing path of the moving contact (21) and the stationary contact (3) to lengthen the arc.

7. The arc elongation structure according to claim 6, characterized in that: The insulating component (4) includes a partition (41), a side plate (42) is connected to one side of the partition (41), a support rod (61) extends from the contact support bracket (6), the side plate (42) is rotatably connected to the support rod (61) through the first connecting rod (53), and the rotation center of the insulating component (4) is configured to be located on the back side of the moving contact (21) at the limit position of the opening.

8. The arc elongation structure according to any one of claims 1 to 7, characterized in that: A blocking base plate (43) is provided extending on the insulating member (4). The blocking base plate (43) is configured to block the bottom channel of the stationary contact (3) in the open state of the moving and stationary contacts to prevent the stationary contact (3) from breaking through the moving contact (21) through the bottom channel.

9. A frame circuit breaker, characterized in that: Includes the arc elongation structure as described in any one of claims 1 to 8.

10. A disconnecting switch, characterized in that: Includes the arc elongation structure as described in any one of claims 1 to 8.

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