Insulation structure of moving contact of circuit breaker

Abstract

The utility model discloses an insulation structure of a moving contact of a circuit breaker, which comprises an insulation assembly, the insulation assembly comprises a first insulation cover and a second insulation cover, the first insulation cover and the second insulation cover are matched to form an insulation cavity, and the inner wall of the insulation cavity is attached to the outer side wall of the moving contact; one of the first insulating cover and the second insulating cover is provided with a slot, and the other one of the first insulating cover and the second insulating cover is provided with a plugging bulge matched with the slot; one end of the moving contact is matched with the rotating shaft, the other end of the moving contact is matched with the static contact, and the insulating component is positioned at one end of the moving contact close to the static contact; firstly, the insulation assembly is matched with the moving contact, so that the protection effect of one end, close to the static contact, of the moving contact is achieved; one end, matched with the rotating shaft, of the moving contact is protected through the rotating shaft; moreover, the first insulating cover and the second insulating cover are clamped and matched, so that the first insulating cover and the second insulating cover are fixed more conveniently, and the assembly efficiency is improved.

Description

Technical Field

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

[0002] A low-voltage molded case circuit breaker (MCCB) is a protective electrical appliance, a type of circuit breaker. When a short circuit occurs in the MCCB, it trips to interrupt the fault current. When a circuit fault occurs (e.g., a short circuit), the current trip unit in the MCCB activates, unlocking the operating mechanism. After unlocking, the mechanism separates the moving contact from the stationary contact via a linkage, thereby interrupting the fault current. When the moving and stationary contacts separate, a high-temperature arc is generated between the moving and stationary contacts. The MCCB uses magnetic blowing or air blowing to blow the high-temperature arc into the arc-extinguishing chamber, where metal grids divide and cool the arc until it is extinguished. However, during this process, because the moving contact is exposed, when the high-temperature arc falls onto the surface of the moving contact, the exposed moving contact will be burned, melted, or vaporized by the high-temperature arc, thus reducing the electrical life and breaking current capacity of the MCCB. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is how to improve the protective effect of the moving contact. To this end, an insulation structure for the moving contact of a circuit breaker includes,

[0004] An insulating assembly includes a first insulating cover and a second insulating cover, which cooperate to form an insulating cavity. The inner wall of the insulating cavity is in contact with the outer wall of the moving contact. One of the first insulating cover and the second insulating cover is provided with a slot, and the other of the first insulating cover and the second insulating cover is provided with a plugging protrusion that cooperates with the slot. One end of the moving contact is engaged with a rotating shaft, and the other end of the moving contact is engaged with a stationary contact. The insulating assembly is located at the end of the moving contact near the stationary contact.

[0005] It also includes a fixing component, which passes through the first insulating cover, the moving contact, and is connected and fixed to the second insulating cover.

[0006] A guide structure is provided between the slot and the insertion protrusion.

[0007] One of the first insulating cover and the second insulating cover is provided with a first inclined surface, and the other of the first insulating cover and the second insulating cover is provided with a second inclined surface that cooperates with the first inclined surface.

[0008] The moving contact is provided with a third inclined surface, and the insulating component is provided with a limiting part, which is in contact with the third inclined surface.

[0009] The insulating component has an extension that extends toward one side of the rotating shaft.

[0010] The first insulating cover includes a top surface and a first side surface, and the second insulating cover includes a bottom surface, a second side surface, and a third side surface. The second side surface and the third side surface are respectively connected to the two sides of the bottom surface, and the first side surface and the second side surface abut against each other.

[0011] The technical solution of this utility model has the following advantages:

[0012] 1. The present invention provides an insulation structure for a moving contact of a circuit breaker. First, the moving contact is protected by the insulating components in conjunction with the moving contact. Second, the end of the moving contact that is in conjunction with the rotating shaft is protected by the rotating shaft. Third, the snap-fit ​​connection between the first insulating cover and the second insulating cover makes it easier to fix the two together and improves assembly efficiency.

[0013] 2. This utility model provides an insulation structure for the moving contact of a circuit breaker. The fixing component increases the fixing strength between the first insulating cover, the second insulating cover, and the moving contact. This fixing component can be a screw or a rivet. Alternatively, a snap-fit ​​fixing method can be used to achieve the connection and fixing effect between the first insulating cover and the second insulating cover.

[0014] 3. The present invention provides an insulation structure and a guiding structure for the moving contact of a circuit breaker, which makes the insertion and connection of the two more convenient during the matching process.

[0015] 4. The insulating structure of the moving contact of the circuit breaker provided by this utility model, in the process of the first inclined surface and the second inclined surface cooperating, not only forms a guiding effect, but also achieves a limiting effect. When the first inclined surface and the second inclined surface are completely in contact, that is, when installed in place, they cannot move.

[0016] 5. The insulating structure of the moving contact of the circuit breaker provided by this utility model also has a positioning and fixing effect with the limiting part and the third inclined surface.

[0017] 6. The present invention provides an insulation structure for the moving contact of a circuit breaker, wherein the extension portion increases the protection range and improves the protection effect.

[0018] 7. The present invention provides an insulation structure for the moving contact of a circuit breaker. The cooperation between the first insulating cover and the second insulating cover forms a mechanical fit, which can better fit with the moving contact and improve the protection effect. This structural design is simple and convenient, and can achieve multi-directional insulation protection for irregular copper contact structures, thereby reducing the damage of electric arc to the contacts. Attached Figure Description

[0019] 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.

[0020] Figure 1 A partial structural schematic diagram of the circuit breaker provided by this utility model;

[0021] Figure 2 A schematic diagram of the insulation structure of the moving contact of the circuit breaker provided by this utility model;

[0022] Figure 3 An exploded view of the insulation structure of the moving contact of the circuit breaker provided by this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 11. First insulating cover; 12. Second insulating cover; 13. Slot; 14. Insertion protrusion; 15. Moving contact; 16. Rotating shaft; 17. Stationary contact; 18. Fixing member; 19. First inclined surface; 20. Second inclined surface; 21. Limiting part; 22. Extension part; 111. First through hole; 112. Top surface; 113. First side surface; 121. Second through hole; 122. Bottom surface; 123. Second side surface; 124. Third side surface; 131. Second guide surface; 141. First guide surface; 151. Third through hole; 152. Third inclined surface. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] Example 1

[0030] This embodiment provides an insulation structure for the moving contact of a circuit breaker, as shown in the attached figure. Figures 1-3 As shown, it includes:

[0031] The insulating assembly includes a first insulating cover 11 and a second insulating cover 12. In this embodiment, the insulating assembly may include not only the first insulating cover 11 and the second insulating cover 12, but also a third insulating cover or more, forming an insulating cavity through the cooperation of multiple insulating covers. Here, only two insulating covers are described. The first insulating cover 11 and the second insulating cover 12 cooperate to form an insulating cavity, and the inner wall of the insulating cavity is in contact with the outer wall of the moving contact 15. One of the first insulating cover 11 and the second insulating cover 12 is provided with a slot 13, and the other of the first insulating cover 11 and the second insulating cover 12 is provided with a insertion protrusion 14 that cooperates with the slot 13. When the first insulating cover 11 is provided with a slot 13, the second insulating cover 12 is provided with an insertion protrusion 14; conversely, when the first insulating cover 11 is provided with an insertion protrusion 14, the second insulating cover 12 is provided with a slot 13. One end of the moving contact 15 engages with the rotating shaft 16, which drives the moving contact 15 to rotate. An elastic element is also provided between the rotating shaft 16 and the moving contact 15. This elastic element applies pressure to the contact, improving electrical stability when the moving contact 15 engages with the stationary contact 17. The structure of the moving contact 15, rotating shaft 16, and elastic element is existing technology and will not be described in detail in this embodiment. The other end of the moving contact 15 engages with the stationary contact 17, which is located on the rotational trajectory of the other end of the moving contact 15. The rotation of the moving contact 15 achieves connection or disconnection with the stationary contact 17. An insulating component is located at the end of the moving contact 15 closest to the stationary contact 17. For example, in the attached diagram, the left end of the moving contact 15 engages with the stationary contact 17, the right end of the moving contact 15 engages with the rotating shaft 16, and the insulating component is located near the left end of the moving contact 15. First, the insulating components work together with the moving contact 15 to create a protective effect on the end of the moving contact 15 that is close to the stationary contact 17. Second, the end of the moving contact 15 that works with the rotating shaft 16 is protected by the rotating shaft 16. Furthermore, the snap-fit ​​connection between the first insulating cover 11 and the second insulating cover 12 makes it easier to fix the two together and improves assembly efficiency.

[0032] Specifically, as shown in the attached document Figures 2-3 As shown, it also includes a fixing member 18, which passes through the first insulating cover 11, the moving contact 15, and is connected and fixed to the second insulating cover 12. The fixing member 18 increases the fixing strength between the first insulating cover 11, the second insulating cover 12, and the moving contact 15. Here, the fixing member 18 can be a screw or a rivet. Specifically, the first insulating cover 11 has a first through hole 111, the second insulating cover 12 has a second through hole 121, and the moving contact 15 has a third through hole 151. The fixing member 18 passes through the first through hole 111, the third through hole 151, and the second through hole 121 for connection and fixation. In this embodiment, the fixing direction of the fixing member 18 is along the width direction of the moving contact 15, passing sequentially through the first insulating cover 11, the moving contact 15, and the second insulating cover 12. Alternatively, a snap-fit ​​fixing method can be used to achieve the connection and fixing effect between the first insulating cover 11 and the second insulating cover 12.

[0033] Specifically, as shown in the attached document Figures 2-3 As shown, a guide structure is provided between the slot 13 and the insertion protrusion 14. This guide structure facilitates easier insertion during the mating process. Specifically, the insertion protrusion 14 has a first guide surface 141, and the slot 13 has a second guide surface 131. During sliding mating, the first guide surface 141 slides along the second guide surface 131, creating a guiding fit. When the slot 13 and the insertion protrusion 14 are fully engaged, the first guide surface 141 and the second guide surface 131 are in contact.

[0034] Specifically, as shown in the attached document Figures 2-3 As shown, one of the first insulating cover 11 and the second insulating cover 12 is provided with a first inclined surface 19, and the other of the first insulating cover 11 and the second insulating cover 12 is provided with a second inclined surface 20 that cooperates with the first inclined surface 19. When the first insulating cover 11 is provided with the first inclined surface 19, the second insulating cover 12 is provided with the second inclined surface 20; conversely, when the first insulating cover 11 is provided with the second inclined surface 20, the second insulating cover 12 is provided with the first inclined surface 19. During the cooperation process, the first inclined surface 19 and the second inclined surface 20 not only form a guiding effect, but also achieve a limiting effect. When the first inclined surface 19 and the second inclined surface 20 are completely fitted, that is, when they are installed in place, they cannot move. In this embodiment, the first inclined surface 19 and the second inclined surface 20 are located at the left end of the insulating component.

[0035] Specifically, as shown in the attached document Figures 2-3 As shown, the moving contact 15 has a third inclined surface 152, and the insulating component has a limiting part 21, which fits against the third inclined surface 152. The limiting part 21 and the third inclined surface 152 also serve a positioning and fixing effect. Here, the limiting part 21 is located at the right end of the insulating component, and the limiting part 21 also has an elastic effect.

[0036] Specifically, as shown in the attached document Figures 2-3 As shown, the insulating assembly has an extension 22 that extends toward the rotating shaft 16. The extension 22 increases the protection range and improves the protection effect. The extension 22 is also located at the right end of the insulating assembly.

[0037] Specifically, as shown in the attached document Figures 2-3As shown, the first insulating cover 11 includes a top surface 112 and a first side surface 113, and the second insulating cover 12 includes a bottom surface 122, a second side surface 123, and a third side surface 124. The second side surface 123 and the third side surface 124 are respectively connected to the two sides of the bottom surface 122, and the first side surface 113 abuts against the second side surface 123. The fit between the first insulating cover 11 and the second insulating cover 12 forms a mecha-like fit, which can better fit with the moving contact 15 and improve the protection effect. This structural design is simple and convenient, and can achieve multi-directional insulation protection for irregular copper contact structures, thereby reducing the damage of electric arc to the contacts. Because the moving contact 15 is not a regular structure, and its surface has chamfered surfaces and bevels, it cannot be properly fitted and protected during the insulation process. However, the first insulating cover 11 and the second insulating cover 12 work together to form a full-coverage of the left end of the moving contact 15 (the contact point of the moving contact 15 needs to cooperate with the stationary contact 17 and needs to be exposed on the outside of the insulation component), which reduces the burn damage to the contact caused by the electric arc, thereby improving the breaking capacity and service life of the circuit breaker.

[0038] Specifically, in this embodiment, the insertion protrusion 14 is disposed on the first side surface 113, and the slot 13 is disposed on the second side surface 123. When the two are engaged, they move relative to each other along the length direction of the moving contact 15, so that the insertion protrusion 14 and the slot 13 engage. There are two first inclined surfaces 19, which are disposed on the left end of the first insulating cover 11. There are also two second inclined surfaces 20, which are disposed on the left end of the second side surface 123 and the left end of the third side surface 124, respectively. The limiting part 21 is disposed on the right end of the bottom surface 122. The extension part 22 is disposed on the right end of the top surface 112.

[0039] Specifically, both the first insulating cover 11 and the second insulating cover 12 are made of insulating material, such as plastic or other insulating materials.

[0040] Specifically, the right end of the moving contact 15 is electrically connected to the circuit breaker terminal via a flexible connection. This flexible connection can be a soft copper wire or a conductor.

[0041] Specifically, the moving contact 15 is first installed and fixed to the rotating shaft 16, and then the first insulating cover 11 or the second insulating cover 12 is fitted onto the left end area of ​​the moving contact 15 to achieve the positioning and installation of the insulating component. Finally, it is fixed by the fastener 18. The structure is simple and convenient, and the installation is quick. It can achieve multi-directional insulation protection for the irregular moving contact 15 structure.

[0042] 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 moving contact of a circuit breaker, characterized in that, include, An insulating assembly includes a first insulating cover (11) and a second insulating cover (12). The first insulating cover (11) and the second insulating cover (12) cooperate to form an insulating cavity. The inner wall of the insulating cavity is in contact with the outer wall of the moving contact (15). One of the first insulating cover (11) and the second insulating cover (12) is provided with a slot (13), and the other of the first insulating cover (11) and the second insulating cover (12) is provided with a plugging protrusion (14) that cooperates with the slot (13). One end of the moving contact (15) cooperates with a rotating shaft (16), and the other end of the moving contact (15) cooperates with a stationary contact (17). The insulating assembly is located at the end of the moving contact (15) near the stationary contact (17).

2. The insulation structure of the moving contact of the circuit breaker according to claim 1, characterized in that, It also includes a fixing member (18), which passes through the first insulating cover (11) and the moving contact (15) and is connected and fixed to the second insulating cover (12).

3. The insulation structure of the moving contact of the circuit breaker according to claim 1, characterized in that, A guide structure is provided between the slot (13) and the insertion protrusion (14).

4. The insulation structure of the moving contact of the circuit breaker according to claim 1, characterized in that, One of the first insulating cover (11) and the second insulating cover (12) is provided with a first inclined surface (19), and the other of the first insulating cover (11) and the second insulating cover (12) is provided with a second inclined surface (20) that cooperates with the first inclined surface (19).

5. The insulation structure of the moving contact of the circuit breaker according to claim 1, characterized in that, The moving contact (15) is provided with a third inclined surface (152), and the insulating component is provided with a limiting part (21), which is in contact with the third inclined surface (152).

6. The insulation structure of the moving contact of the circuit breaker according to claim 1, characterized in that, The insulating component is provided with an extension (22) that extends toward the shaft (16).

7. The insulation structure of the moving contact of the circuit breaker according to claim 1, characterized in that, The first insulating cover (11) includes a top surface (112) and a first side surface (113). The second insulating cover (12) includes a bottom surface (122), a second side surface (123), and a third side surface (124). The second side surface (123) and the third side surface (124) are respectively connected to the two sides of the bottom surface (122). The first side surface (113) and the second side surface (123) abut against each other.

Images