An insulating structure of a circuit breaker

Abstract

The utility model provides a kind of insulation structure of circuit breaker, contact device includes at least one group of contact mechanism, the contact mechanism includes the movable contact that can be opened and closed and static contact, movable contact includes the movable contact point with static contact and the movable contact rod extendedly arranged to static contact, insulation structure includes the at least two insulation cover casing of being sleeved in movable contact rod outside, the insulation cover casing is wrapped around movable contact rod by buckling structure between, the insulation structure can effectively avoid causing arc back spray, internal interphase short circuit and other problems.

Description

Technical Field

[0001] This utility model relates to the field of molded case circuit breaker technology, specifically to an insulation structure for a circuit breaker. Background Technology

[0002] Circuit breakers are an important part of electrical distribution equipment, mainly used in industrial low-voltage power systems. They are used to connect and disconnect current in the power grid circuit and protect lines and power equipment from faults such as overload, undervoltage, short circuit, and single-phase grounding. When a fault occurs in the circuit (such as overload, short circuit, undervoltage, etc.), the moving and stationary contacts in the molded case circuit breaker are pushed by the protection device (trip device) to release the main contacts, thereby achieving disconnection. During the disconnection process, the electric arc will move around the surface of the conductor, which can cause problems such as arc back-spray and internal phase-to-phase short circuit. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to overcome the defects in the prior art where the electric arc moves around the surface of the conductor during the breaking process of the contact assembly, thereby causing problems such as arc back-spray and internal phase-to-phase short circuit, and thus providing an insulation structure that can prevent short circuits in circuit breakers.

[0004] Therefore, this utility model provides an insulation structure for a circuit breaker. The contact device includes at least one set of contact mechanisms. The contact mechanism includes a moving contact and a stationary contact capable of opening and closing. The moving contact includes a moving contact point that contacts the stationary contact and a moving contact rod that extends away from the stationary contact. The insulation structure includes at least two insulating covers sleeved on the outside of the moving contact rod. The insulating covers are wrapped around the moving contact rod by a fastening structure.

[0005] Furthermore: the insulating cover consists of a first insulating cover and a second insulating cover, which are connected to each other by a fastening device and wrapped around the moving contact rod.

[0006] Furthermore, the fastening device includes a fastening block disposed on one of the first insulating cover or the second insulating cover, and a fastening groove disposed on the other and adapted to the fastening block.

[0007] Furthermore: the fastening block is disposed on the first insulating cover, the fastening groove is formed on the second insulating cover, the fastening block includes a fastening end and an abutting end arranged in a snap-fit ​​structure, the second insulating cover is provided with an abutting groove to avoid the fastening end, the abutting groove is connected to the fastening groove, the fastening end is located between the abutting grooves, and the abutting end abuts against the inner wall of the fastening groove.

[0008] Furthermore: a plug-in structure is formed between the first insulating cover and the second insulating cover, the second insulating cover is wrapped around the outside of the first insulating cover, and plug-in structures for positioning the first and second insulating covers are provided on the sides of the first and second insulating covers.

[0009] Furthermore, the plug-in structure includes a first through groove disposed on the first insulating cover and a second through groove disposed on the second insulating cover, and a positioning rod for connecting the first insulating cover and the second insulating cover is provided between the first through groove and the second through groove.

[0010] Furthermore, the first through groove, the second through groove, and the positioning rod are riveted together for fixation.

[0011] Furthermore, the first insulating cover is riveted to the moving contact rod.

[0012] Furthermore: an operating mechanism is provided on the side of the moving contact facing away from the stationary contact, the operating mechanism has a mechanism shaft, and an insulating sleeve is fitted on the mechanism shaft.

[0013] The technical solution of this utility model has the following advantages: 1. This utility model provides an insulation structure for a circuit breaker, in which an insulating cover is provided outside the moving contact rod. The insulating cover wraps around the moving contact rod. Because the insulating cover is made of insulating material, the electric arc generated after the moving and stationary contacts break will not contact other adjacent components inside the circuit breaker through the insulating cover, thus effectively solving the problem of circuit breaker burnout. The insulating cover is wrapped around the moving contact rod by a snap-fit ​​method. Since the moving contact rod has a different structural shape, it would be costly to completely fit the insulating cover onto the moving contact rod with a one-piece molded insulating cover, and it would be difficult to fit the moving contact rod into the insulating cover. Therefore, the insulating cover is assembled by snap-fitting two parts, which is convenient for installation, reduces production costs, and effectively reduces assembly difficulty.

[0014] 2. The present invention provides an insulation structure for a circuit breaker, wherein the insulation cover includes a first insulation cover and a second insulation cover that are interlocked with each other. During installation, the second insulation cover is first placed over the outside of the moving contact rod, and then the first insulation cover is placed over the upper end of the moving contact rod so that the interlocking block is inserted into the interlocking groove, thereby completing the complete fit between the first insulation cover and the second insulation cover and the outer end of the moving contact rod. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the contact device located inside the housing. Figure 2 This is a schematic diagram showing the positional distribution of the contact device and the operating mechanism. Figure 3 An enlarged view showing the positional distribution of the contact device and the operating mechanism; Figure 4 This is a schematic diagram of the assembly structure of the insulating cover and the moving contact; Figure 5 This is a schematic diagram showing the distribution structure of the contact assembly and the insulating housing; Figure 6 This is a schematic diagram of the insulating cover.

[0017] Explanation of reference numerals in the attached figures: 1. Moving contact; 11. Moving contact point; 12. Moving contact rod; 2. Stationary contact; 3. Insulating cover; 31. First insulating cover; 32. Second insulating cover; 4. Fastening device; 41. Fastening block; 411. Fastening end; 412. Abutting end; 42. Fastening groove; 43. Clearance groove; 5. Insertion structure; 51. First through groove; 52. Second through groove; 53. Positioning rod; 6. Operating mechanism; 61. Mechanism shaft; 7. Insulating sleeve. Detailed Implementation

[0018] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0022] Example This embodiment provides an insulation structure for a circuit breaker. The contact device includes at least one set of contact mechanisms. The contact mechanism includes a moving contact 1 and a stationary contact 2 capable of opening and closing. The moving contact 1 includes a moving contact point 11 that contacts the stationary contact 2 and a moving contact rod 12 that extends away from the stationary contact 2. The insulation structure includes at least two insulating covers 3 sleeved on the outside of the moving contact rod 12. The insulating covers 3 are wrapped around the moving contact rod 12 by a fastening structure.

[0023] The specific improvements mentioned above are as follows: Figures 1-3 As shown, compared to the prior art, an insulating cover 3 is provided on the outside of the moving contact rod 12. The insulating cover 3 wraps around the moving contact rod 12 (including the upper, lower, left, and right ends of the moving contact rod 12). Because the insulating cover 3 is made of insulating material, the arc generated after the moving contact 1 and the stationary contact 2 break will not contact other adjacent components in the circuit breaker through the insulating cover 3, thus effectively solving the problem of circuit breaker burnout. The insulating cover is wrapped around the moving contact rod 12 by a snap-fit ​​method. Since the moving contact rod 12 has a different structural shape, it is costly to completely fit the insulating cover 3 onto the moving contact rod 12 with an integrally formed insulating cover 3. Moreover, it is difficult to fit the moving contact rod 12 into the insulating cover 3. Since the insulating cover 3 is assembled by snap-fitting two parts, it not only reduces the production cost but also effectively reduces the assembly difficulty.

[0024] Based on the above embodiments: the insulating cover 3 consists of a first insulating cover 31 and a second insulating cover 32, and the first insulating cover 31 and the second insulating cover 32 are wrapped around the moving contact rod 12 by a fastening device 4.

[0025] Based on the above embodiments: the fastening device 4 includes a fastening block 41 disposed on one of the first insulating cover 31 or the second insulating cover 32 and a fastening groove 42 disposed on the other and adapted to the fastening block 41.

[0026] The specific improvements mentioned above are as follows: Figures 4-6 As shown, the insulating cover 3 includes a first insulating cover 31 and a second insulating cover 32 that are interlocked with each other. During installation, the second insulating cover 32 is first put on the outside of the moving contact rod 12, and then the first insulating cover 31 is put on from the upper end of the moving contact rod 12, so that the fastening block 41 is inserted into the fastening groove 42, and finally the first insulating cover 31 and the second insulating cover 32 are fully adapted to the outer end of the moving contact rod 12.

[0027] Based on the above embodiments: the fastening block 41 is disposed on the first insulating cover 31, the fastening groove 42 is formed on the second insulating cover 32, the fastening block 41 includes a fastening end 411 and an abutting end 412 disposed in a snap-fit ​​structure, the second insulating cover 32 is provided with an abutting groove 43 to avoid the fastening end 411, the abutting groove 43 communicates with the fastening groove 42, the fastening end 411 is located between the abutting grooves 43, and the abutting end 412 abuts against the inner wall of the fastening groove 42.

[0028] The specific improvements mentioned above are as follows: Figure 4 As shown, when installing the first insulating cover 31 and the second insulating cover 32, the moving contact 11 is first inserted into the opening of the second insulating cover 32, so that the second insulating cover 32 covers the lower end, left end and right end of the moving contact rod 12. Then, the fastening block 41 on the first insulating cover 31 is inserted into the opening of the fastening groove 42, so that the first insulating cover 31 covers the upper end of the moving contact rod 12. Finally, the moving contact rod 12 is covered on all four sides. After the installation is completed, the fastening end 411 is locked in the middle position of the relief groove 43, and the abutting end 412 abuts against the inner wall of the fastening groove 42, thereby preventing the first insulating cover 31 and the second insulating cover 32 from separating.

[0029] Based on the above embodiments: a plug-in structure is formed between the first insulating cover 31 and the second insulating cover 32, the second insulating cover 32 is wrapped around the outside of the first insulating cover 31, and plug-in structures 5 for positioning the first insulating cover 31 and the second insulating cover 32 are provided on the side.

[0030] Based on the above embodiments: the plug-in structure 5 includes a first through groove 51 disposed on the first insulating cover 31 and a second through groove 52 disposed on the second insulating cover 32, and a positioning rod 53 for connecting the first insulating cover 31 and the second insulating cover 32 is provided between the first through groove 51 and the second through groove 52.

[0031] The specific improvements mentioned above are as follows: To increase the tightness of the connection between the first insulating cover 31, the second insulating cover 32 and the moving contact rod 12, a first through groove 51 and a second through groove 52 are respectively provided on the first insulating cover 31 and the second insulating cover 32. The first through groove 51 and the second through groove 52 are located on the side close to the moving contact 11, and the positioning rod 53 is passed through the first through groove 51 and the second through groove 52 to fix the first insulating cover 31 and the second insulating cover 32. Through the cooperation between the fastening block 41 and the fastening groove 42 and the cooperation between the first through groove 51, the second through groove 52 and the positioning rod 53, the first insulating cover 31 and the second insulating cover can be double fixed, increasing the tightness of the connection between the first insulating cover 31, the second insulating cover 32 and the moving contact rod 12. The positioning rod 53 can be fixed in the first through groove 51 and the second through groove 52 by fastening, snapping, welding, riveting or other positioning connection.

[0032] Based on the above embodiments: the first through groove 51, the second through groove 52 and the positioning rod 53 are riveted together.

[0033] Based on the above embodiments: the first insulating cover 31 and the moving contact rod 12 are riveted together.

[0034] The specific improvements mentioned above are as follows: Figure 4 As shown, in a preferred embodiment, the first through groove 51, the second through groove 52 and the positioning rod 53 can be fixed by riveting. Riveting is a fast processing method and has a strong connection. Similarly, the first insulating cover 31 and the moving contact rod 12 can also be fixed by riveting.

[0035] Based on the above embodiments: the moving contact 1 is provided with an operating mechanism 6 on the side opposite to the stationary contact 2, the operating mechanism 6 has a mechanism shaft 61, and an insulating sleeve 7 is sleeved on the mechanism shaft 61.

[0036] The specific improvements mentioned above are as follows: Figure 2 and Figure 3As shown, the first insulating cover 31 wraps around the upper end of the moving contact rod 12. When the moving contact 1 and the stationary contact 2 break, the electric repulsion force will drive the moving contact 1 upward. The direction of the electric arc generated during the break is irregular. Although most of the electric arc will enter the arc extinguishing chamber, a small part of the electric arc will also be sprayed upward along the extension direction of the moving contact rod 12 to the mechanism shaft 61. Due to the high temperature of the electric arc and the large electric repulsion force, a rigid collision is formed between the moving contact 1 and the mechanism shaft 61, which will damage the insulation layer on the mechanism shaft 61. Therefore, by setting the first insulating cover, the moving contact rod 12 can be prevented from directly contacting the insulating sleeve 7. In this way, when the moving contact 1 and the stationary contact 2 break, the temperature of the first insulating cover 31 will not be too high when it comes into contact with the insulating sleeve 7, which can effectively prevent the insulating sleeve 7 on the mechanism shaft 61 from melting. Moreover, the first insulating cover 31 and the insulating sleeve 7 are both plastic products, which can prevent the insulating sleeve 7 on the mechanism shaft 61 from cracking during the collision process.

[0037] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An insulation structure for a circuit breaker, characterized in that: The contact device includes at least one set of contact mechanisms, the contact mechanisms including a moving contact (1) and a stationary contact (2) capable of opening and closing the circuit. The moving contact (1) includes a moving contact point (11) that contacts the stationary contact (2) and a moving contact rod (12) that extends away from the stationary contact (2). The insulation structure includes at least two insulating covers (3) sleeved on the outside of the moving contact rod (12). The insulating covers (3) are wrapped around the moving contact rod (12) by a fastening structure.

2. The insulation structure of a circuit breaker according to claim 1, characterized in that: The insulating cover (3) consists of a first insulating cover (31) and a second insulating cover (32), which are connected to each other by a fastening device (4) and wrapped around the moving contact rod (12).

3. The insulation structure of a circuit breaker according to claim 2, characterized in that: The fastening device (4) includes a fastening block (41) disposed on one of the first insulating cover (31) or the second insulating cover (32) and a fastening groove (42) disposed on the other and adapted to the fastening block (41).

4. The insulation structure of a circuit breaker according to claim 3, characterized in that: The fastening block (41) is disposed on the first insulating cover (31), and the fastening groove (42) is opened on the second insulating cover (32). The fastening block (41) includes a fastening end (411) and an abutting end (412) disposed in a snap-fit ​​structure. The second insulating cover (32) is provided with an abutting groove (43) that avoids the fastening end (411). The abutting groove (43) communicates with the fastening groove (42). The fastening end (411) is located between the abutting grooves (43), and the abutting end (412) abuts against the inner wall of the fastening groove (42).

5. The insulation structure of a circuit breaker according to claim 4, characterized in that: A plug-in structure is formed between the first insulating cover (31) and the second insulating cover (32), the second insulating cover (32) is wrapped around the outside of the first insulating cover (31), and a plug-in structure (5) for positioning the two is provided on the side of the first insulating cover (31) and the second insulating cover (32).

6. The insulation structure of a circuit breaker according to claim 5, characterized in that: The plug-in structure (5) includes a first through groove (51) disposed on the first insulating cover (31) and a second through groove (52) disposed on the second insulating cover (32), and a positioning rod (53) for connecting the first insulating cover (31) and the second insulating cover (32) is provided between the first through groove (51) and the second through groove (52).

7. The insulation structure of a circuit breaker according to claim 6, characterized in that: The first through groove (51), the second through groove (52), and the positioning rod (53) are riveted together.

8. The insulation structure of a circuit breaker according to claim 7, characterized in that: The first insulating cover (31) is riveted to the moving contact rod (12).

9. The insulation structure of a circuit breaker according to any one of claims 1-3, characterized in that: An operating mechanism (6) is provided on the side of the moving contact (1) facing away from the stationary contact (2). The operating mechanism (6) has a mechanism shaft (61), and an insulating sleeve (7) is fitted on the mechanism shaft (61).

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