A circuit breaker

Abstract

The application provides a circuit breaker, which comprises a shell, an operating mechanism and a static contact in the shell, the operating mechanism comprises a support, a handle, a connecting rod, a jump buckle, a lock buckle and a moving contact, the support is fixed in the shell, the handle is connected with the jump buckle and the support through the connecting rod, an installation slot is arranged on the support, a positioning column is arranged on the installation slot, a positioning hole matched with the positioning column is arranged on the moving contact, a limiting block is arranged on the side of the support opposite to the moving contact and facing the swinging direction of the static contact, a limiting slot for the moving contact to slide in is arranged on the limiting block, a limiting protrusion is arranged on the end of the moving contact facing the handle, a limiting clamping groove matched with the limiting protrusion is arranged on the side of the support opposite to the static contact, and a blocking arm extending upwards from the positioning column is arranged on the lock buckle. The application is convenient to install and the moving contact is stable in swinging.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical technology, and more specifically to a circuit breaker. Background Technology

[0002] A circuit breaker is a contact device capable of closing, carrying, and interrupting current under normal circuit conditions, and capable of closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. A circuit breaker includes a housing, operating mechanism, protection mechanism, trip unit, and testing device.

[0003] The existing Chinese patent application number is CN201821962869.4, entitled "A Miniature Circuit Breaker," which discloses "a miniature circuit breaker, comprising a circuit breaker body, the circuit breaker body including a housing and a moving contact mechanism and a stationary contact disposed within the housing, characterized in that: the moving contact mechanism includes a matching moving contact and a moving bracket, the moving bracket is provided with a mounting groove adapted to the moving contact, a positioning cylinder is provided in the mounting groove, and the positioning cylinder and the moving bracket are integrally formed; a positioning hole is provided at the rear of the moving contact." The positioning cylinder is inserted internally, and the rear of the moving contact has an arc portion adapted to the mounting groove. A moving spring connected to the moving contact is also fitted on the positioning cylinder. The moving contact is installed in the mounting groove through the positioning hole and the positioning cylinder. The mounting space is relatively large, and there is no limit to the moving contact. This causes the moving contact to swing relative to the positioning cylinder towards the stationary contact. Since the moving spring is elastically connected to the moving bracket, the moving contact will still experience some vertical movement, resulting in inaccurate alignment with the stationary contact and affecting the conduction between them. Limiting the moving contact with the moving spring makes assembly cumbersome. Summary of the Invention

[0004] In view of the above problems, the purpose of this invention is to provide a circuit breaker that is easy to install and has stable moving contact swing.

[0005] To address the above problems, the following technical solution is provided: A circuit breaker includes a housing, an operating mechanism located within the housing, and a stationary contact. The operating mechanism includes a bracket, a handle, a connecting rod, a trip latch, a latch, and a moving contact. The bracket is fixed within the housing. The handle is linked to the trip latch and the bracket via the connecting rod. The bracket has a mounting groove with a positioning post. The moving contact has a positioning hole that matches the positioning post. The bracket has a limiting block on the side opposite to the moving contact in the swing direction of the stationary contact. The limiting block has a limiting groove to facilitate the sliding of the moving contact. The end of the moving contact facing the handle has a limiting protrusion. The bracket has a limiting slot on the side opposite to the stationary contact that matches the limiting protrusion. The latch has a stop arm extending upward toward the positioning post.

[0006] In the above structure, the moving contact is fitted onto the positioning post through the positioning hole and then installed in the mounting groove. The moving contact rotates circumferentially relative to the positioning post, causing one end to rotate into the limiting groove of the limiting block, and the limiting protrusion at the other end to rotate into the limiting slot. The two ends of the moving contact are limited by the limiting groove and the limiting slot, which can improve the firmness of the moving contact installation and improve the stability when the bracket drives the moving contact to swing to abut against the stationary contact, thereby improving the stability of the conduction between the moving contact and the stationary contact and improving the reliability of the invention. By setting the limiting groove and the limiting slot to limit the moving contact, the setting of torsion spring can be reduced. Compared with the limiting and fixing by torsion spring, the structure of the invention is simpler and uses fewer parts, reducing the production cost of the invention. It can facilitate the installation of the moving contact, improve the production efficiency of the invention, and make the moving contact more stable after installation, thus improving the reliability of the invention. By setting the stop arm, the moving contact can be further limited in the vertical direction relative to the positioning post, thereby further improving the stability of the moving contact and the reliability of the moving contact during swing. By incorporating a trip latch, a lock, and a handle, the moving contact and the stationary contact can be manually disconnected if the circuit cannot be automatically disconnected by the protection mechanism, thus improving the safety performance of this invention.

[0007] The present invention is further configured such that a hooking hole is provided on the side of the moving contact facing the positioning post on the side of the limiting protrusion, a tension spring is provided on the side of the moving contact opposite to the stationary contact, a fixing post is provided on the side of the housing opposite to the stationary contact, one end of the tension spring is connected to the hooking hole, and the other end is connected to the fixing post.

[0008] In the above structure, when the moving contact abuts against the stationary contact, the handle is not fully turned to the desired position. When the handle is continued to be turned, the large contact force generated by the abutting of the stationary and moving contacts causes the end of the moving contact with the limiting protrusion to swing towards the stationary contact. This, through the tension of the spring, tightly holds the end of the moving contact with the limiting protrusion. Thus, while the handle is turned to the desired position and overtravel is achieved, the tension of the spring ensures the moving contact is firmly pressed against the stationary contact, improving the reliability of the invention. Furthermore, its simple structure avoids the need for multiple torsion springs, improving assembly efficiency. The mounting hole and fixing post facilitate the installation of the tension spring, further enhancing assembly convenience. The tension spring also limits the movement of the moving contact, ensuring it engages with the limiting groove, thereby improving the stability of the moving contact.

[0009] The present invention is further configured such that a fixing hole is provided on the fixing column, and a fixing pin connected to the tension spring is fixed in the fixing hole.

[0010] The above structure can further improve the stability of the tension spring after it is fixed, and the fixing pin can improve the robustness of the housing.

[0011] The present invention is further configured such that the bottom end of the limiting groove is open.

[0012] By adopting the above structure, the contact area between the limiting block and the moving contact can be reduced, thereby reducing wear, extending the service life of the moving contact, and facilitating the swinging of the moving contact, thus improving the reliability of the present invention.

[0013] The present invention is further configured such that the end of the moving contact is located at the outer end of the limiting groove and protrudes toward the stationary contact.

[0014] The above structure facilitates the contact between the moving contact and the stationary contact, thereby improving the stability of the present invention.

[0015] The present invention is further configured such that a thickened portion is provided on the side of the moving contact facing the stationary contact relative to the limiting protrusion, the thickened portion being integrally formed with the moving contact and located on the upper and lower sides of the moving contact.

[0016] By adopting the above structure, the stability and reliability of the moving contact and the stationary contact when conducting can be improved, thereby improving the reliability of the present invention.

[0017] The present invention is further configured such that the stop arm extends upward toward the limiting block to form an extension portion.

[0018] By adopting the above structure, the limiting of the stop arm on the moving contact can be further improved, and the stability of the latch during operation can be improved, thereby improving the reliability of the present invention.

[0019] The present invention is further configured such that the housing is provided with a fixed column, the bracket is provided with a first connecting hole corresponding to the inner hole of the fixed column, the latch is located on the side of the bracket facing the stationary contact, the latch is provided with a connecting part above it on the side facing the bracket, and the connecting part is provided with a second connecting hole corresponding to the first connecting hole.

[0020] The above structure facilitates the installation of the latch and bracket into the housing by having them pass through the second connecting hole, the first connecting hole and the inner hole of the fixed column in sequence via the connector, thereby improving the ease of disassembly and assembly of the invention and reducing the installation space of the operating mechanism.

[0021] The present invention is further configured such that the bracket has a mounting groove adapted to the connecting part.

[0022] The above structure improves the stability and firmness of the latch installation, thereby enhancing the safety and reliability of the invention. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention.

[0024] Figure 2 for Figure 1 Enlarged view of the structure at point A in the middle.

[0025] Figure 3 This is a schematic diagram of the structure of the inner wall of the shell in this invention.

[0026] Figure 4 This is a first-view structural schematic diagram of the operating mechanism in this invention.

[0027] Figure 5 This is a schematic diagram of the operating mechanism from a second perspective in this invention.

[0028] Figure 6 This is a schematic diagram of the structure in which the support and the moving contact cooperate in this invention.

[0029] Figure 7 This is a schematic diagram of the support structure in this invention.

[0030] Figure 8 This is a schematic diagram of the moving contact in this invention.

[0031] The labels in the diagram have the following meanings: 1-Housing; 2-Operating mechanism; 3-Static contact; 21-Bracket; 22-Handle; 23-Linking rod; 24-Jump buckle; 25-Lock; 26-Moving contact; 211-Mounting groove; 212-Positioning pin; 261-Positioning hole; 4-Limiting block; 41-Limiting groove; 262-Limiting protrusion; 213-Limiting slot; 251-Stop arm; 263-Hanging hole; 5-Tension spring; 11-Fixing pin; 111-Fixing hole; 112-Fixing pin; 264-Thickened part; 2511-Extension part; 113-Fixing tube column; 214-First connecting hole; 252-Connecting part; 2521-Second connecting hole; 215-Installation groove. Detailed Implementation

[0032] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0034] like Figures 1 to 8The circuit breaker shown includes a housing 1, an operating mechanism 2 located within the housing 1, and a stationary contact 3. The operating mechanism 2 includes a bracket 21, a handle 22, a connecting rod 23, a trip latch 24, a locking latch 25, and a moving contact 26. The bracket 21 is fixed within the housing 1. The handle 22 is linked to the trip latch 24 and the bracket 21 via the connecting rod 23. The bracket 21 has a mounting groove 211, and a positioning post 212 is provided on the mounting groove 211. The moving contact 26 has a connection point with the positioning post 212. The bracket 21 has 12 matching positioning holes 261. A limiting block 4 is provided on the side of the bracket 21 opposite to the swing direction of the moving contact 26 towards the stationary contact 3. A limiting groove 41 is provided on the limiting block 4 to facilitate the sliding of the moving contact 26. A limiting protrusion 262 is provided on the end of the moving contact 26 facing the handle 22. A limiting slot 213 that matches the limiting protrusion 262 is provided on the side of the bracket 21 opposite to the stationary contact 3. A stop arm 251 is provided on the latch 25 extending upward toward the positioning post 212.

[0035] In the above structure, the moving contact 26 is fitted onto the positioning post 212 through the positioning hole 261, and then installed in the mounting groove 211. The moving contact 26 rotates circumferentially relative to the positioning post 212, so that one end rotates into the limiting groove 41 of the limiting block 4, and the limiting protrusion 262 at the other end rotates into the limiting slot 213. The two ends of the moving contact 26 are limited by the limiting groove 41 and the limiting slot 213, which can improve the firmness of the installation of the moving contact 26 and improve the stability when the bracket 21 drives the moving contact 26 to swing to abut against the stationary contact 3, thereby improving the stability of the conduction between the moving contact 26 and the stationary contact 3 and improving the reliability of the present invention. By setting the stop arm 251, the moving contact 26 can be further limited in the vertical direction relative to the positioning post 212, thereby further improving the stability of the moving contact 26 and the reliability of the moving contact 26 when swinging. By limiting the moving contact 26 with the limiting groove 41 and the limiting slot 213, the need for a torsion spring can be reduced. Compared with limiting and fixing with a torsion spring, the structure of this invention is simpler, requires fewer parts, reduces production costs, facilitates the installation of the moving contact 26, improves production efficiency, and makes the moving contact 26 more stable after installation, thus improving the reliability of the invention. The use of a jump buckle 24, a locking buckle 25, and a handle 22 ensures that the moving contact 26 and the stationary contact 3 can be manually disconnected if the circuit cannot be automatically disconnected by the protection mechanism, improving the safety performance of the invention. The handle 22, connecting rod 23, jump buckle 24, and bracket 21 are connected using conventional linkage methods.

[0036] The present invention is further configured such that a hanging hole 263 is provided on the side of the moving contact 26 facing the positioning post 212 on the side of the limiting protrusion 262, a tension spring 5 is provided on the side of the moving contact 26 opposite to the stationary contact 3, and a fixing post 11 is provided on the side of the housing 1 opposite to the stationary contact 3. One end of the tension spring 5 is connected to the hanging hole 263, and the other end is connected to the fixing post 11.

[0037] In the above structure, when the moving contact 26 abuts against the stationary contact 3, the handle 22 is not fully turned into position. When the handle 22 is turned further, the large abutting force generated by the stationary contact 3 and the moving contact 26 causes the end of the moving contact 26 with the limiting protrusion 262 to swing towards the stationary contact 3. The tension spring 5 then tightly holds the end of the moving contact 26 with the limiting protrusion 262 in place. This allows the moving contact 26 to be tightly pressed against the stationary contact 3 while the handle 22 is turned into position and overtravel is achieved, improving the reliability of the invention. Furthermore, its simple structure avoids the need for multiple torsion springs, improving assembly efficiency and reducing production costs. The mounting hole 263 and the fixing post 11 facilitate the installation of the tension spring 5, thus improving the ease of assembly. The tension spring 5 also limits the movement of the moving contact 26, ensuring it abuts against the limiting groove 41, thereby improving the stability of the moving contact 26.

[0038] The present invention is further configured such that a fixing hole 111 is provided on the fixing post 11, and a fixing pin 112 connected to the tension spring 5 is fixed on the fixing hole 111.

[0039] The above structure can further improve the stability of the tension spring 5 after it is fixed, and the fixing pin 112 can improve the robustness of the housing 1.

[0040] The present invention is further configured such that the bottom end of the limiting groove 41 is open.

[0041] By adopting the above structure, the contact area between the limiting block 4 and the moving contact 26 can be reduced, thereby reducing its wear, extending the service life of the moving contact 26, and facilitating the swinging of the moving contact 26, thus improving the reliability of the present invention.

[0042] The present invention is further configured such that the end of the moving contact 26 is located at the outer end of the limiting groove 41 and protrudes toward the stationary contact 3.

[0043] The above structure facilitates the contact between the moving contact 26 and the stationary contact 3, thereby improving the stability of the present invention.

[0044] The present invention is further configured such that a thickened portion 264 is provided on one end of the moving contact 26 relative to the limiting protrusion 262 facing the stationary contact 3, the thickened portion 264 is integrally formed with the moving contact 26 and is located on the upper and lower sides of the moving contact 26.

[0045] By adopting the above structure, the stability and reliability of the moving contact 26 and the stationary contact 3 when conducting can be improved, thereby improving the reliability of the present invention.

[0046] The present invention is further configured such that the stop arm 251 extends upward toward the limiting block 4 to form an extension portion 2511.

[0047] By adopting the above structure, the limiting of the stop arm 251 on the moving contact 26 can be further improved, and the stability of the latch 25 during movement can be improved, thereby improving the reliability of the present invention.

[0048] The present invention is further configured such that the housing 1 is provided with a fixed column 113, the bracket 21 is provided with a first connecting hole 241 corresponding to the inner hole of the fixed column 113, the latch 25 is located on the side of the bracket 21 facing the stationary contact 3, the latch 25 is provided with a connecting part 252 above the side facing the bracket 21, and the connecting part 252 is provided with a second connecting hole 2521 corresponding to the first connecting hole 241.

[0049] With the above structure, the latch 25 and the bracket 21 can be installed in the housing 1 by passing through the second connecting hole 2521 and the first connecting hole 241 in sequence with the inner hole of the fixed column 113 through the connector, thereby improving the convenience of disassembly and assembly of the present invention and reducing the installation space of the operating mechanism 2.

[0050] The present invention is further configured such that the bracket 21 has a mounting groove 215 adapted to the connecting part 252.

[0051] By adopting the above structure, the stability and firmness of the installation of the latch 25 can be improved, thereby improving the safety and reliability of the present invention.

[0052] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications assumed above should also be considered within the scope of protection of the present invention.

Claims

1. A circuit breaker, comprising a housing, an operating mechanism located within the housing, and stationary contacts, wherein the operating mechanism includes a bracket, a handle, a connecting rod, a trip latch, a locking latch, and a moving contact, the bracket being fixed within the housing, and the handle being linked to the trip latch and the bracket via the connecting rod, characterized in that: The bracket has an installation groove with a positioning post. The moving contact has a positioning hole that matches the positioning post. The bracket has a limiting block on the side opposite to the moving contact in the swing direction of the stationary contact. The limiting block has a limiting groove to facilitate the sliding of the moving contact. The end of the moving contact facing the handle has a limiting protrusion. The bracket has a limiting slot on the side opposite to the stationary contact that matches the limiting protrusion. The latch has a stop arm extending upward toward the positioning post. The moving contact has a hook hole on the side of the moving contact opposite to the positioning post. The side of the moving contact opposite to the stationary contact has a tension spring. The housing has a fixing post on the side opposite to the stationary contact. One end of the tension spring is connected to the hook hole, and the other end is connected to the fixing post.

2. A circuit breaker according to claim 1, characterized in that: The fixing post has a fixing hole, and a fixing pin connected to the tension spring is fixed in the fixing hole.

3. A circuit breaker according to claim 1, characterized in that: The bottom of the limiting groove is open.

4. A circuit breaker according to claim 3, characterized in that: The moving contact end is located at the outer end of the limiting groove and protrudes towards the stationary contact.

5. A circuit breaker according to claim 4, characterized in that: The moving contact has a thickened portion on the side facing the stationary contact relative to the limiting protrusion.

6. A circuit breaker according to claim 5, characterized in that: The thickened portion is integrally formed with the moving contact and is located on the upper and lower sides of the moving contact.

7. A circuit breaker according to claim 1, characterized in that: The stop arm extends upward toward the limiting block to form an extension.

8. A circuit breaker according to claim 1, characterized in that: The housing is provided with a fixed column, and the bracket is provided with a first connecting hole corresponding to the inner hole of the fixed column. The latch is located on the side of the bracket facing the stationary contact. The latch is provided with a connecting part above it on the side facing the bracket. The connecting part is provided with a second connecting hole corresponding to the first connecting hole.

9. A circuit breaker according to claim 8, characterized in that: The bracket has a mounting groove that matches the connecting part.

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