Moving contact for molded case circuit breaker

Abstract

The utility model relates to a molded case circuit breaker's moving contact relates to breaker technical field, including moving contact body, mounting subassembly and spacing subassembly, mounting subassembly includes rotating shaft, connecting seat and a plurality of support plate, the support plate is installed on the connecting seat, the rotating shaft is installed on the moving contact body, the rotating shaft is equipped with the notch, the spacing subassembly is equipped with the notch. The supporting plate is provided with a circular groove for rotatably installing the rotating shaft, the supporting plate is provided with a first sliding groove, the first sliding groove penetrates through the side wall of one side of the supporting plate, the first sliding groove communicates with the circular groove, the limiting assembly comprises an installing block, a spring and an abutting block, the installing block is installed on the supporting plate, and the abutting block is connected with the spring. One end of the spring is arranged on the mounting block, the other end of the spring is connected with the abutting block, the abutting block abuts against the side wall of the moving contact body, and the moving contact body is provided with a limiting opening. According to the utility model, through the installation assembly and the limiting assembly, the moving contact structure is simple and convenient to assemble and disassemble, and the moving contact is difficult to fall off.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a moving contact for a molded case circuit breaker. Background Art

[0002] The molded case circuit breaker has two-stage protection functions of overload long-time delay and short-circuit instantaneous operation, and can also be used in cooperation with leakage protectors, measuring modules, electric operating modules, etc. In the low-voltage distribution system, it is commonly used as the terminal switch or branch switch, replacing the commonly used fuses and knife switches in the past; the moving contact for the molded case circuit breaker is the main line conductive contact material for medium and low-voltage circuit breakers. The function of the moving contact locking structure is: after the moving and static contacts are repelled to the maximum opening distance, the moving contact stays at the maximum position until the operating mechanism trips under the action of the release, so as to avoid the arc reignition caused by the drop of the moving contact due to the reduction of the fault short-circuit current.

[0003] At present, the Chinese utility model patent application with the publication date of August 2, 2022 and the publication number of CN217114289U proposes a repulsive moving contact locking structure for a molded case circuit breaker, including a contact support and a moving contact. A contact cavity is formed inside the contact support. A rotating shaft is arranged inside the contact cavity. The inner end of the moving contact is connected to the rotating shaft. A linkage shaft is arranged at the lower position on the inner side of the rotating shaft of the moving contact. A torsion spring shaft is arranged inside the contact cavity. A torsion spring is sleeved on the torsion spring shaft. One end of the torsion spring abuts against the contact support, and the other end is connected to the linkage shaft. The utility model can provide the downward pressure in the normal state and the repulsive force in the repulsive state for the moving contact with one torsion spring, and has a simple structure and reliable performance.

[0004] However, disassembling and assembling the moving contact and the repulsive moving contact locking structure is a relatively laborious and complicated process. In addition, the locking force of the repulsive moving contact locking structure is prone to be unstable, which easily leads to unreliable locking defects. Summary of the Invention

[0005] The utility model provides a moving contact for a molded case circuit breaker, which can improve the technical problems of complicated disassembly and assembly of the moving contact structure and unstable locking force existing in the related technology.

[0006] The embodiment of the present application provides a moving contact for a molded case circuit breaker, including:

[0007] A moving contact body, an installation component, and a limiting component. The installation component includes a rotating shaft, a connecting seat, and a plurality of support plates. The support plates are arranged on both sides of the moving contact body and are fixedly installed on the connecting seat. The rotating shaft is installed on the moving contact body. A notch is opened on the rotating shaft. The support plates rotatably install the rotating shaft by opening circular grooves. A first sliding groove is arranged on the support plates. The first sliding groove penetrates through one side wall of the support plates. The first sliding groove communicates with the circular groove. The width of the first sliding groove is smaller than the diameter of the rotating shaft.

[0008] The limiting component includes a mounting block, a spring and an abutting block. The mounting block is mounted on the support plate. One end of the spring is arranged on the mounting block, and the other end is connected to the abutting block. The abutting block abuts against the side wall of the moving contact body. A limiting port is arranged on the moving contact body. The abutting block is used for being clamped at the limiting port when the moving contact body is repelled.

[0009] In the technical solution described above in the embodiment of the present application, it has at least the following technical effects:

[0010] When installing the moving contact, align the cut of the rotating shaft with the notch of the first chute, move the moving contact body, and move the rotating shaft towards the direction close to the circular groove until the rotating shaft is rotatably installed in the circular groove to complete the installation; when disassembling and assembling the moving contact, align the cut of the rotating shaft with the first chute, move the moving contact body, and move the rotating shaft towards the direction away from the circular groove until the rotating shaft is rotatably installed in the circular groove to complete the disassembly and assembly; therefore, the arrangement of the rotating shaft and the plurality of support plates facilitates the staff to disassemble and assemble the moving contact body, and the operation is simple and convenient; when the moving contact body is repelled, the moving contact body flips. During the flipping process of the moving contact body, the limiting port flips towards the direction close to the abutting block until the abutting block is clamped in the limiting port under the action of the spring, so as to quickly fix the repelled moving contact, which can effectively reduce the probability of the contact dropping during the breaking process of the moving contact, and can achieve quick breaking, improving the breaking ability of the circuit breaker; therefore, the arrangement of the spring and the abutting block can quickly fix the repelled moving contact, effectively reducing the probability of the contact dropping during the breaking process of the moving contact.

[0011] The moving contact for a molded case circuit breaker provided by the embodiment of the present application can facilitate the staff to disassemble and assemble the moving contact body, the operation is simple and convenient, and can quickly fix the repelled moving contact, effectively reducing the probability of the contact dropping during the breaking process of the moving contact.

[0012] In some embodiments, a guiding surface is arranged on the side wall of the limiting port close to the rotating shaft.

[0013] In some embodiments, one end of the moving contact body has a moving contact, and the other end of the moving contact has a connecting portion. The rotating shaft is arranged on the connecting portion.

[0014] In some embodiments, a connecting plate is fixedly mounted on the support plate, and a bolt is rotatably connected to the connecting plate. The bolt is used to make it difficult to align the cut with the first chute.

[0015] In some embodiments, a linkage shaft is arranged on the connecting portion, a second chute and an arc-shaped groove are arranged on the support plate. The second chute penetrates through the side wall on one side of the support plate, and one end of the second chute communicates with one end of the arc-shaped groove. The cuts are arranged on both sides of the rotating shaft.

[0016] In some embodiments, sliding bars are fixedly connected to both ends of the abutting block. The sliding bars extend along the reset direction of the spring, and the support plate is slidably installed with the sliding bars by opening a third sliding groove.

[0017] In some embodiments, a plurality of threaded holes are provided on the connecting seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a three-dimensional structural schematic diagram of a moving contact for a plastic case circuit breaker provided by an embodiment of the present application;

[0020] Figure 2 It is a sectional view along Figure 1 the A-A line in

[0021] Figure 3 It is an exploded view when the moving contact body is energized provided by an embodiment of the present application;

[0022] Figure 4 It is an exploded view when the moving contact body is repelled provided by an embodiment of the present application.

[0023] Among them, the reference numerals in the drawings are as follows:

[0024] 10. Moving contact body; 11. Moving contact; 12. Connecting part; 13. Limiting port; 131. Guiding surface; 20. Mounting assembly; 21. Rotating shaft; 211. Notch; 22. Connecting seat; 221. Threaded hole; 23. Support plate; 231. Circular groove; 232. First sliding groove; 233. Second sliding groove; 234. Arc-shaped groove; 235. Third sliding groove; 24. Connecting plate; 25. Bolt; 30. Limiting assembly; 31. Mounting block; 32. Spring; 33. Abutting block; 34. Sliding bar. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the following further describes the present application in detail with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0028] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of this application.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality" means two or more unless otherwise specifically defined.

[0030] In this application, "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships can exist; for example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0031] It should be noted that in this application, words such as "in some embodiments", "exemplarily", "for example", etc. are used to give examples, illustrations or explanations. Any embodiment or design solution described as "in some embodiments", "exemplarily", "for example" in this application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "in some embodiments", "exemplarily", "for example" is intended to present relevant concepts in a specific manner, meaning that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The appearance of the above words at various positions in the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0032] The molded case circuit breaker has a two-stage protection function of overload long-time delay and short-circuit instantaneous tripping, and can also be used in cooperation with leakage protectors, measurement, electric operation and other module units. In the low-voltage distribution system, it is commonly used as the terminal switch or branch switch, replacing the commonly used fuses and knife switches in the past; the moving contact of the molded case circuit breaker is the main line conductive contact material of medium and low-voltage circuit breakers. The function of the moving contact locking structure is: after the moving and static contacts are repelled to the maximum opening distance, the moving contact stays at the maximum position until the operating mechanism trips under the action of the release, so as to prevent the moving contact from dropping due to the reduction of the fault short-circuit current and causing the arc to reignite.

[0033] The Chinese utility model patent application with the publication number CN217114289U proposes a repellable moving contact locking structure for a molded case circuit breaker. This repellable moving contact locking structure uses a torsion spring in cooperation with a linkage shaft on the moving contact, so as to effectively prevent the dropping of the moving contact and avoid the reignition of the arc of the moving contact. However, disassembling and assembling the moving contact and the repellable moving contact locking structure is a relatively laborious and complicated process; in addition, the locking force of the repellable moving contact locking structure is prone to be unstable, which easily leads to unreliable locking defects.

[0034] Based on this, in order to improve the technical problems of the complicated disassembly and assembly of the moving contact structure and the unstable locking force existing in the related art, the embodiments of this application provide the following solutions.

[0035] The embodiments of this application provide a moving contact for a molded case circuit breaker, including:

[0036] Moving contact body 10, mounting assembly 20, and limiting assembly 30. The mounting assembly 20 includes a rotating shaft 21, a connecting seat 22, and multiple support plates 23. The support plates 23 are arranged on both sides of the moving contact body 10 and are fixedly installed on the connecting seat 22. The rotating shaft 21 is fixedly installed on the moving contact body 10. A notch 211 is provided on the rotating shaft 21. The support plate 23 rotatably mounts the rotating shaft 21 by providing a circular groove 231. A first sliding groove 232 is provided on the support plate 23. The first sliding groove 232 penetrates through one side wall of the support plate 23 and communicates with the circular groove 231. The width of the first sliding groove 232 is smaller than the diameter of the rotating shaft 21.

[0037] The limiting assembly 30 includes a mounting block 31, a spring 32, and an abutting block 33. The mounting block 31 is installed on the support plate 23. One end of the spring 32 is provided on the mounting block 31, and the other end is connected to the abutting block 33. The abutting block 33 abuts against the side wall of the moving contact body 10. A limiting port 13 is provided on the moving contact body 10. The abutting block 33 is used to be clamped at the limiting port 13 when the moving contact body 10 is repelled.

[0038] As can be seen from the above, for a moving contact used in a molded case circuit breaker provided in an embodiment of the present application, when installing the moving contact, align the notch 211 of the rotating shaft 21 with the notch of the first sliding groove 232, move the moving contact body 10, and move the rotating shaft 21 in the direction close to the circular groove 231 until the rotating shaft 21 is rotatably installed in the circular groove 231 to complete the installation; when disassembling and installing the moving contact, align the notch 211 of the rotating shaft 21 with the first sliding groove 232, move the moving contact body 10, and move the rotating shaft 21 in the direction away from the circular groove 231 until the rotating shaft 21 is rotatably installed in the circular groove 231 to complete the disassembly and installation; therefore, the arrangement of the rotating shaft 21 and the multiple support plates 23 facilitates the staff to disassemble and install the moving contact body 10, and the operation is simple and convenient; when the moving contact body 10 is repelled, the moving contact body 10 flips. During the flipping process of the moving contact body 10, the limiting port 13 flips in the direction close to the abutting block 33 until the abutting block 33 is clamped in the limiting port 13 under the action of the spring 32, so as to quickly fix the repelled moving contact, which can effectively reduce the probability of the contact dropping during the breaking process of the moving contact, and can achieve quick breaking, improving the breaking ability of the circuit breaker; therefore, the arrangement of the spring 32 and the abutting block 33 can quickly fix the repelled moving contact and effectively reduce the probability of the contact dropping during the breaking process of the moving contact.

[0039] Optionally, in some embodiments, please refer to Figures 1 to 2 , a plurality of threaded holes 221 are provided on the connecting seat 22.

[0040] With such arrangement, when the entire moving contact needs to be installed in the circuit breaker, the connection base 22 is moved so that the threaded hole 221 of the connection base 22 is aligned with the threaded notch of the circuit breaker, and screws can be used for fixing and installing, which further facilitates the user to install the moving contact.

[0041] Optionally, in some embodiments, please read Figures 1 to 2 One end of the moving contact body 10 has a moving contact point 11 , and the other end of the moving contact has a connecting portion 12 , and the rotating shaft 21 is arranged on the connecting portion 12 .

[0042] With such an arrangement, after the moving contact is installed, during the operation of the molded case low-voltage circuit breaker, the moving contact body 10 will, under the pressure of the spring 32 on the abutment block 33, make the moving contact 11 abut against the static contact, and power will be turned on. When a large fault short-circuit current appears in the line, the moving contact 11 will overcome the pressure of the contact spring 32 and be repelled in advance under the action of the electric repulsive force, and the connecting part 12 will rotate, causing power failure to protect the circuit.

[0043] Optionally, in some embodiments, see Figures 3 to 4 A guide surface 131 is obliquely provided on the side wall of the limiting opening 13 close to the rotating shaft 21 .

[0044] With such arrangement, after the moving contact body 10 is repelled, the abutment block 33 is stuck in the limit opening 13. When power needs to be re-circulated, the moving contact body 10 is flipped over to make the moving contact 11 move in the direction close to the static contact. At this time, the abutment block 33 abuts on the guide surface 131, and the moving contact body 10 is continued to be flipped over to make the abutment block 33 move in the direction away from the abutment block 33 until it is disengaged from the limit opening 13 and abuts on the bottom of the moving contact body 10 under the action of the spring 32. The abutment block 33 is arranged on the side of the rotating shaft 21 away from the moving contact 11. The moving contact 11 abuts against the static contact under the elastic force of the spring 32 to complete power-on. Therefore, the setting of the guide surface 131 facilitates the abutment block 33 to disengage from the limit opening 13, and the moving contact 11 is easily abutted against the static contact under the elastic force of the spring 32 to complete power-on for repeated use.

[0045] Optionally, in some embodiments, see Figures 3 to 4 The rotating shaft 21 is fixedly mounted on the connecting portion 12 , a connecting plate 24 is fixedly mounted on the supporting plate 23 , a bolt 25 is rotatably connected to the connecting plate 24 , and the bolt 25 is used to make it difficult for the cutout 211 to align with the first sliding groove 232 .

[0046] With such a setting, after the moving contact is installed, in order to make it difficult for the notch 211 to align with the first sliding groove 232, reduce the probability of the rotating shaft 21 disengaging from the circular groove 231, when the notch 211 is about to align with the first sliding groove 232, rotate the bolt 25 so that the bolt 25 abuts against the side wall of the connecting portion 12, making it difficult for the rotating shaft 21 to continue to flip, thereby reducing the probability of the rotating shaft 21 disengaging from the circular groove 231. Therefore, the setting of the bolt 25 and the connecting plate 24 makes it difficult for the notch 211 to align with the first sliding groove 232, thereby reducing the probability of the rotating shaft 21 disengaging from the circular groove 231 and making it difficult for the rotating shaft 21 to shake during daily work.

[0047] Optionally, in some embodiments, please refer to Figures 2 to 3 , a linkage shaft is provided on the connecting portion 12, a second sliding groove 233 and an arc-shaped groove 234 are provided on the support plate 23, the second sliding groove 233 penetrates through the side wall on one side of the support plate 23, and one end of the second sliding groove 233 communicates with the arc-shaped groove 234. The notch 211 is provided on both sides of the rotating shaft 21.

[0048] With such a setting, when installing the moving contact, align the notches 211 on both sides of the rotating shaft 21 with the notch of the first sliding groove 232, align the linkage shaft with the notch of the second sliding groove 233, slide the moving contact body 10, and move the rotating shaft 21 in the direction close to the circular groove 231 until the rotating shaft 21 is rotatably installed in the circular groove 231. At this time, the linkage shaft is located at the communication point of the second sliding groove 233 and the arc-shaped groove 234, and the installation is completed; if the moving contact is damaged and needs to be disassembled, flip the moving contact body 10 so that the linkage shaft is located at the communication point of the second sliding groove 233 and the arc-shaped groove 234, the linkage shaft is located at one end of the arc-shaped groove 234, and the notches 211 on both sides of the rotating shaft 21 are aligned with the notch of the first sliding groove 232. When the moving contact 11 is further flipped downward, the linkage shaft will abut against one end of the arc-shaped groove 234, making it difficult for the moving contact 11 to flip downward. At this time, the rotating shaft 21 can be aligned with the first sliding groove 232, the linkage shaft can be aligned with the second sliding groove 233, and then move until the moving contact is taken out to complete the disassembly. Therefore, the setting of the linkage shaft facilitates the staff to determine the position where the notches 211 on both sides of the rotating shaft 21 are aligned with the first sliding groove 232 and facilitates the removal of the moving contact.

[0049] Optionally, in some embodiments, please refer to Figures 3 to 4 , both ends of the abutting block 33 are fixedly connected with sliding strips 34, the sliding strips 34 extend along the direction close to the connecting portion 12, and the support plate 23 slidably installs the sliding strips 34 by opening a third sliding groove 235.

[0050] With such a setting, after the moving contact body 10 is repelled, the abutting block 33 is snapped into the limiting port 13. When power needs to be reconnected, the moving contact body 10 is flipped so that the moving contact 11 moves towards the static contact. At this time, the abutting block 33 abuts against the guiding surface 131. Continuing to flip the moving contact body 10, the abutting block 33 can only move away from the connecting portion 12 under the limitation of the sliding bar 34 and the third sliding groove 235 until it disengages from the limiting port 13, and under the action of the spring 32 and the limitation of the sliding bar 34 and the third sliding groove 235, it abuts against the bottom of the moving contact body 10. The abutting block 33 is arranged on the side of the rotating shaft 21 away from the moving contact 11. The moving contact 11 abuts against the static contact under the elastic force of the spring 32 to complete the power connection. Therefore, the arrangement of the sliding bar 34 and the third sliding groove 235 enables the abutting block 33 to only move in the direction close to or away from the connecting portion 12, reducing the probability of the position of the abutting block 33 shifting during daily use.

[0051] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A moving contact for a molded case circuit breaker, characterized in that: It includes a moving contact body (10), a mounting assembly (20) and a limiting assembly (30). The mounting assembly (20) includes a rotating shaft (21), a connecting seat (22) and a plurality of support plates (23). The support plates (23) are arranged on both sides of the moving contact body (10). The rotating shaft (21) is installed on the moving contact body (10) and fixedly installed on the connecting seat (22). A notch (211) is formed on the rotating shaft (21). The support plate (23) rotatably installs the rotating shaft (21) by forming a circular groove (231). A first sliding groove (232) is arranged on the support plate (23). The first sliding groove (232) penetrates through the side wall of one side of the support plate (23). The first sliding groove (232) communicates with the circular groove (231). The width of the first sliding groove (232) is smaller than the diameter of the rotating shaft (21). The limiting assembly (30) includes a mounting block (31), a spring (32) and an abutting block (33). The mounting block (31) is installed on the support plate (23). One end of the spring (32) is arranged on the mounting block (31), and the other end is connected to the abutting block (33). The abutting block (33) abuts against the side wall of the moving contact body (10). A limiting port (13) is arranged on the moving contact body (10). The abutting block (33) is used for being clamped at the limiting port (13) when the moving contact body (10) is repelled.

2. The moving contact for a molded case circuit breaker according to claim 1, characterized in that: A guiding surface (131) is arranged on the side wall of the limiting port (13) close to the rotating shaft (21).

3. The moving contact for a molded case circuit breaker according to claim 2, wherein: One end of the moving contact body (10) has a moving contact point (11), and the other end of the moving contact has a connecting portion (12). The rotating shaft (21) is arranged on the connecting portion (12).

4. The moving contact for a molded case circuit breaker according to claim 3, characterized in that: A connecting plate (24) is fixedly installed on the support plate (23). A bolt (25) is rotatably connected to the connecting plate (24). The bolt (25) is used to make it difficult for the notch (211) to align with the first sliding groove (232).

5. The moving contact for a molded case circuit breaker according to claim 4, characterized in that: A linkage shaft is arranged on the connecting portion (12). A second sliding groove (233) and an arc-shaped groove (234) are arranged on the support plate (23). The second sliding groove (233) penetrates through the side wall of one side of the support plate (23). The second sliding groove (233) communicates with one end of the arc-shaped groove (234). The notch (211) is arranged on both sides of the rotating shaft (21).

6. The moving contact for a molded case circuit breaker according to claim 5, characterized in that: Sliding bars (34) are fixedly connected to both ends of the abutting block (33). The sliding bars (34) extend along the reset direction of the spring (32). The support plate (23) slidably installs the sliding bars (34) by forming a third sliding groove (235).

7. The moving contact for a molded case circuit breaker according to claim 1, characterized in that: A plurality of threaded holes (221) are arranged on the connecting seat (22).

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