Stable miniature circuit breaker

Abstract

The utility model discloses a stable miniature circuit breaker. The miniature circuit breaker comprises a housing. The excitation release is fixedly arranged in the shell and is used for instantaneously breaking the miniature circuit breaker; the moving contact assembly is rotatably assembled in the shell, the moving contact assembly comprises a contact seat, a moving contact, an auxiliary contact and a tripping piece, the moving contact, the auxiliary contact and the tripping piece are rotatably assembled on the contact seat, the auxiliary contact is clamped with the tripping piece, the auxiliary contact rotates to drive the tripping piece to act, the other end of the tripping piece is provided with a contact part, and the contact part is connected with the contact seat. The contact part abuts against the excitation release, a cavity is formed in the contact part and used for forming a first-stage buffer structure, a gap is formed between the contact part and the contact seat, an elastic piece is arranged in the gap, one end of the elastic piece abuts against the contact part, and the other end of the elastic piece abuts against the contact seat and used for forming a second-stage buffer structure. According to the utility model, a two-stage buffer structure is adopted, and the impact force in the breaking process is effectively relieved, so that the abrasion degree of the contact is greatly reduced. Therefore, not only is the service life of the contact prolonged, but also the failure rate caused by abrasion of the contact is reduced, and the overall performance of the circuit breaker is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a stable small circuit breaker. Background Art

[0002] Miniature circuit breakers (MCBs) play a crucial role as key protection components in power systems. They are widely used in low-voltage distribution networks to quickly cut off power when abnormal conditions such as overloads and short circuits occur, ensuring the safety of equipment and personnel. However, the increasing complexity of power systems and the continuous increase in electrical loads are placing higher demands on the stability and reliability of MCBs.

[0003] Traditional miniature circuit breakers (MCBs) have inherent design flaws, particularly in the structure and buffering mechanism of the moving contact assembly. As a core component of the circuit breaker, the stability and durability of the moving contact assembly are directly related to the overall performance of the circuit breaker. However, existing moving contact assemblies are often subjected to significant impact forces during the disconnection process. This can cause problems such as moving contact assembly misalignment, loss of auxiliary contacts, and damage to the contact holder, thus affecting the proper operation of the circuit breaker. Utility Model Content

[0004] (1) Technical issues to be resolved

[0005] To solve the above problems, the present invention proposes a stable miniature circuit breaker, which aims to solve the problem in the prior art that the moving contact assembly is often subjected to a large impact force during the disconnection process, which may cause the moving contact assembly to deflect, the auxiliary contact to fall off, and the contact seat to be damaged, thereby affecting the normal operation of the circuit breaker.

[0006] (2) Technical solution

[0007] The utility model provides a stable miniature circuit breaker, the miniature circuit breaker comprising:

[0008] case;

[0009] An excitation release, fixedly disposed in the housing, for instantaneously disconnecting the miniature circuit breaker;

[0010] A moving contact assembly is rotatably mounted in the housing, the moving contact assembly comprising a contact base, a moving contact, an auxiliary contact and a tripping piece, the moving contact, the auxiliary contact and the tripping piece are all rotatably mounted on the contact base, the auxiliary contact is engaged with the tripping piece, the rotation of the auxiliary contact can drive the tripping piece to move, the other end of the tripping piece is provided with a contact portion, the contact portion abuts against the excitation release, a cavity is provided on the contact portion, for forming a primary buffer structure, a gap is provided between the contact portion and the contact base, and an elastic piece is provided in the gap, one end of the elastic piece abuts against the contact portion, and the other end abuts against the contact base, for forming a secondary buffer structure;

[0011] A handle is rotatably arranged on the upper portion of the housing;

[0012] A connecting rod has one end connected to the handle and the other end connected to the auxiliary contact.

[0013] In the present invention, a protrusion is provided in the gap for stabilizing the elastic member, and one end of the elastic member is connected to the protrusion.

[0014] In the present invention, a first step is provided at one end of the auxiliary contact, and a second step matching the first step is provided at the top of the tripping member, and the first step is engaged with the second step.

[0015] In the utility model, the contact seat is provided with a first boss for installing the auxiliary contact, a second boss for installing the release member, and a third boss for installing the moving contact. One end of the auxiliary contact is provided with a sleeve hole that cooperates with the first boss, and a socket is also provided between the sleeve hole and the first step. One end of the connecting rod is inserted into the socket to link the handle and the socket.

[0016] In the present invention, a rotating portion is provided on the release member, the rotating portion is rotatably engaged with the second protrusion, and the rotating portion is arranged close to the second step.

[0017] In the present invention, the distance between the rotating portion and the second step is greater than the distance between the rotating portion and the contact portion.

[0018] (3) Beneficial effects

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] (1) The utility model adopts a two-stage buffer structure, which effectively alleviates the impact force during the disconnection process, thereby greatly reducing the degree of contact wear. This not only extends the service life of the contacts, but also reduces the failure rate caused by contact wear, thereby improving the overall performance of the circuit breaker.

[0021] (2) In the present invention, a protrusion is provided within the gap to stabilize the elastic member, ensuring that the elastic member will not loosen and affect the buffering effect during long-term use. At the same time, the auxiliary contact and the tripping member are connected by the first step and the second step, further improving the stability and reliability of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic diagram of the internal structure of a miniature circuit breaker;

[0024] Figure 2 Schematic diagram of the three-dimensional structure of the auxiliary contact;

[0025] Figure 3 Schematic diagram of the three-dimensional structure of the moving contact assembly (first side view);

[0026] Figure 4 It is a schematic diagram of the three-dimensional structure of the moving contact assembly (second side surface).

[0027] 10. Housing, 11. Handle, 12. Connecting rod, 13. Moving contact assembly, 14. Contact seat, 15. Tripping piece, 16. Moving contact, 17. Excitation release, 18. Terminal assembly, 19. Arc extinguishing chamber, 20. First step, 21. Second step, 22. Cavity, 23. Gap, 24. Protrusion, 25. First boss, 26. Second boss, 27. Third boss, 28. Auxiliary contact, 29. Hole, 30. Rotating part, 31. Contact part. DETAILED DESCRIPTION

[0028] Compared to the embodiments shown in the drawings, feasible embodiments within the scope of protection of the present disclosure may have fewer components, additional components not shown in the drawings, different components, differently arranged components, or differently connected components, etc. In addition, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0029] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meanings understood by persons of ordinary skill in the art to which this invention belongs. The terms "first," "second," and similar expressions used in the specification and claims of this utility model patent application do not denote any order, quantity, or importance, but are merely used to distinguish different components. Similarly, terms such as "a" or "an" do not necessarily indicate a quantitative limitation. Terms such as "include," "comprising," or "having" mean that the element or object preceding the term encompasses the elements or objects listed after the term, and their equivalents, without excluding other elements or objects. Terms such as "connected" or "connected" are not limited to physical or mechanical connections or communications as shown in the accompanying drawings, but may include equivalent connections or communications, whether direct or indirect. Terms such as "upper," "lower," "left," "right," "horizontal," and "vertical" are used only to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example 1

[0032] like Figures 1-4 A stable miniature circuit breaker is shown, which mainly includes: a housing 10 and an excitation release 17, a moving contact 16 assembly 13, a handle 11, a connecting rod 12, a terminal assembly 18, an arc extinguishing chamber 19, and a static contact installed in the housing 10.

[0033] Specifically, the excitation release 17 is fixedly mounted within the housing 10 and is used to instantaneously disconnect the miniature circuit breaker. The movable contact 16 assembly 13 is rotatably mounted within the housing 10. The handle 11 is rotatably mounted on the upper portion of the housing 10. One end of the connecting rod 12 is connected to the handle 11, and the other end is connected to the auxiliary contact 28. Specifically, the movable contact 16 assembly 13 includes a contact base 14, a movable contact 16, an auxiliary contact 28, and a tripping member 15. The movable contact 16, the auxiliary contact 28, and the tripping member 15 are all rotatably mounted on the contact base 14. One end of the auxiliary contact 28 is provided with a first step 20. The top of the tripping member 15 is provided with a second step 21 that cooperates with the first step 20. The first step 20 engages with the second step 21, i.e., the auxiliary contact 28 engages with the tripping member 15.

[0034] The rotation of the auxiliary contact 28 can drive the tripping member 15. The other end of the tripping member 15 is provided with a contact portion 31, which abuts the excitation release 17. The contact portion 31 is provided with a cavity 22, which forms a primary buffer structure. A gap 23 is defined between the contact portion 31 and the contact base 14. An elastic member is disposed within the gap 23, with one end of the elastic member abutting the contact portion 31 and the other end abutting the contact base 14, forming a secondary buffer structure. A protrusion 24 is disposed within the gap 23 to stabilize the elastic member, and one end of the elastic member is connected to the protrusion 24.

[0035] The multi-stage buffer structure can effectively reduce the impact of the excitation release 17 on the contact base 14, thereby preventing the moving contact 16 assembly 13 from deflecting due to excessive force or the auxiliary contact 28 from falling off.

[0036] Furthermore, the elastic member may be a compression spring, a high-density sponge or rubber, etc., and its main function is to reduce the impact force of the excitation release 17.

[0037] The contact seat 14 is provided with a first boss 25 for mounting the auxiliary contact 28, a second boss 26 for mounting the tripping member 15, and a third boss 27 for mounting the moving contact 16. One end of the auxiliary contact 28 is provided with a sleeve hole 29 that cooperates with the first boss 25. A socket is also provided between the sleeve hole 29 and the first step 20. One end of the connecting rod 12 is inserted into the socket to link the handle 11 and the socket.

[0038] The release member 15 is provided with a rotating portion 30, which is rotatably engaged with the second protrusion 26 and is disposed near the second step 21. The distance between the rotating portion 30 and the second step 21 is greater than the distance between the rotating portion 30 and the contact portion 31.

[0039] Specifically, the implementation steps are as follows: Step 1: Prepare raw materials, including the contact base 14, movable contact 16, auxiliary contact 28, release member 15, connecting rod 12, compression spring, high-density sponge, and rubber. The contact base 14, movable contact 16, auxiliary contact 28, and release member 15 are all made of copper, the connecting rod 12 is made of stainless steel, and the compression spring is made of carbon steel. Step 2: Process and assemble the contact base 14, movable contact 16, auxiliary contact 28, and release member 15 according to the design drawings. Specifically, the movable contact 16, auxiliary contact 28, and release member 15 are all rotatably mounted on the contact base 14. A first step 20 is provided at one end of the auxiliary contact 28, and a second step 21 is provided at the top of the release member 15 to cooperate with the first step 20. The first step 20 engages with the second step 21, that is, the auxiliary contact 28 engages with the release member 15. Step 3: Connect one end of the connecting rod 12 to the handle 11 and the other end to the auxiliary contact 28. The length of the connecting rod 12 is 10 cm and the diameter is 2 cm. Step 4: A cavity 22 is provided on the contact portion 31 to form a primary buffer structure. A gap 23 is provided between the contact portion 31 and the contact seat 14, and a compression spring is provided in the gap 23. One end of the compression spring abuts against the contact portion 31, and the other end abuts against the contact seat 14 to form a secondary buffer structure. Step 5: A protrusion 24 is provided in the gap 23 to stabilize the compression spring. One end of the compression spring is connected to the protrusion 24. Step 6: Install the miniature circuit breaker on the test equipment and conduct a durability test. The test conditions are: temperature 25°C, humidity 50%, voltage 220V, current 10A, and test time is 1000 hours. The test results show that the miniature circuit breaker operates normally, and there are no problems such as the displacement of the moving contact 16 assembly 13 or the falling off of the auxiliary contact 28, which proves the effectiveness and reliability of this technical solution.

[0040] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Any modifications and improvements to the technical solution of the present invention made by a person of ordinary skill in the art without departing from the design concept of the present invention shall fall within the scope of protection of the present invention. The technical content sought to be protected by the present invention is fully set forth in the claims.

Claims

1. A stable miniature circuit breaker, characterized in that: The miniature circuit breakers shown include: case; An excitation release, fixedly disposed in the housing, for instantaneously disconnecting the miniature circuit breaker; A moving contact assembly is rotatably mounted in the housing, the moving contact assembly comprising a contact base, a moving contact, an auxiliary contact and a tripping piece, the moving contact, the auxiliary contact and the tripping piece are all rotatably mounted on the contact base, the auxiliary contact is engaged with the tripping piece, the rotation of the auxiliary contact can drive the tripping piece to move, the other end of the tripping piece is provided with a contact portion, the contact portion abuts against the excitation release, a cavity is provided on the contact portion, for forming a primary buffer structure, a gap is provided between the contact portion and the contact base, and an elastic piece is provided in the gap, one end of the elastic piece abuts against the contact portion, and the other end abuts against the contact base, for forming a secondary buffer structure; A handle is rotatably arranged on the upper portion of the housing; A connecting rod has one end connected to the handle and the other end connected to the auxiliary contact.

2. The stable miniature circuit breaker according to claim 1, characterized in that A protrusion is provided in the gap for stabilizing the elastic member, and one end of the elastic member is connected to the protrusion.

3. The stable miniature circuit breaker according to claim 2, characterized in that: A first step is provided at one end of the auxiliary contact, and a second step matching the first step is provided at the top of the tripping member, and the first step is engaged with the second step.

4. The stable miniature circuit breaker according to claim 3, characterized in that The contact seat is provided with a first boss for mounting the auxiliary contact, a second boss for mounting the tripping member, and a third boss for mounting the moving contact. One end of the auxiliary contact is provided with a sleeve hole that cooperates with the first boss, and a socket is further provided between the sleeve hole and the first step. One end of the connecting rod is inserted into the socket to link the handle and the socket.

5. The stable miniature circuit breaker according to claim 4, characterized in that: The release member is provided with a rotating portion, the rotating portion is rotationally engaged with the second protrusion, and the rotating portion is arranged close to the second step.

6. The stable miniature circuit breaker according to claim 5, characterized in that The distance between the rotating portion and the second step is greater than the distance between the rotating portion and the contact portion.

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