CN221226139U

CN221226139U - Small-sized circuit breaker

Info

Publication number: CN221226139U
Application number: CN202323175036.7U
Authority: CN
Inventors: 廖军; 金海勇
Original assignee: Kedu Electric Co Ltd
Current assignee: Kedu Electric Co Ltd
Priority date: 2023-11-23
Filing date: 2023-11-23
Publication date: 2024-06-25
Anticipated expiration: 2033-11-23

Abstract

The utility model provides a miniature circuit breaker, comprising: the contact mechanism comprises a fixed contact fixed on the shell and a movable contact assembly rotatably mounted on the shell; the operation mechanism comprises a knob, a link rod, a rotating wheel and an energy storage jump assembly, wherein the energy storage jump assembly comprises a locking piece which rotates in linkage with the knob, a limiting piece which is rotatably arranged on the rotating wheel, and an energy storage spring which is arranged between the limiting piece and the rotating wheel, and the limiting piece is connected with the movable contact assembly through the link rod assembly; in the closing process, the limiting piece is provided with a first state of rotating in a linkage way with the rotating wheel and driving the movable contact assembly to rotate towards the closing direction, a second state of stopping rotating in a matched way with the locking piece and a third state of separating from the locking piece, wherein in the second state, the limiting piece stops rotating, the rotating wheel rotates relative to the locking piece, and the energy storage spring stores energy; in the third state, the energy storage spring releases energy, and the movable contact of the movable contact assembly is driven to be in quick contact communication with the fixed contact through the driving limiting piece and the connecting rod assembly.

Description

Small-sized circuit breaker

Technical Field

The utility model relates to the technical field of piezoelectric devices, in particular to a miniature circuit breaker.

Background

The miniature circuit breaker is used for switching on or interrupting load and protection circuits and low-voltage protection appliances of equipment in a power distribution system, has the functions of manual switching and automatic voltage loss, undervoltage, overload and short-circuit protection, can be used for distributing electric energy, does not frequently start an asynchronous motor, protects power supply circuits, motors and the like, and can automatically cut off circuits when serious overload or short-circuit, undervoltage and other faults occur.

The miniature circuit breaker comprises an operating mechanism and a contact mechanism, wherein a relatively large opening distance is arranged between a movable contact and a fixed contact for closing, a large impact force can be generated between the movable contact and the fixed contact in the closing process, the movable contact can be repeatedly bounced at the beginning of being connected with the fixed contact and is disconnected from time to time, so that an arc is continuously generated, the contacts are easily ablated, and the service life is shortened.

Disclosure of utility model

Therefore, the technical problem to be solved by the utility model is to overcome the defects that in the prior art, long-time bouncing is generated due to large impact force when the switch is closed, and arc ablation contacts are easy to continuously generate, so that the miniature circuit breaker for shortening the arc generation time is provided.

The utility model provides a miniature circuit breaker, which comprises a contact mechanism and an operating mechanism, wherein the contact mechanism comprises a fixed contact fixed on a shell and a movable contact assembly rotatably installed on the shell; the operation mechanism comprises a knob, a link rod, a rotating wheel and an energy storage jump assembly, wherein the energy storage jump assembly comprises a locking piece which rotates in linkage with the knob, a limiting piece which is rotatably arranged on the rotating wheel, and an energy storage spring which is arranged between the limiting piece and the rotating wheel, and the limiting piece is connected with the movable contact assembly through the link rod assembly; in the closing process, the limiting piece is provided with a first state which rotates in a linkage way with the rotating wheel and drives the movable contact assembly to rotate towards the closing direction, a second state which is matched with the locking piece to stop rotating, and a third state which is separated from the locking piece, wherein in the second state, the limiting piece stops rotating, the rotating wheel rotates relative to the limiting piece, and the energy storage spring stores energy; and in the third state, the energy storage spring releases energy, and the moving contact of the moving contact assembly is driven to be in contact communication with the fixed contact by driving the limiting piece and the connecting rod assembly.

The locking piece is provided with a locking surface which is arranged towards the limiting piece, and the limiting piece is provided with a limiting surface which is arranged corresponding to the locking piece, wherein the locking surface is separated from the limiting surface in the first state and the third state; and in the second state, the locking surface is in contact sliding friction with the limiting surface, and the limiting piece stops rotating.

The rotating wheel, the limiting piece and the connecting rod assembly all rotate around a first shaft.

The connecting rod assembly comprises a first connecting rod and a second connecting rod, the first connecting rod rotates around the first shaft and is provided with a first rotating arm and a second rotating arm which extend outwards from the rotation center of the first connecting rod and are arranged at a certain included angle, and one end of the first rotating arm far away from the first shaft is connected with the limiting piece through a second shaft; and one end of the second connecting rod is rotationally connected with the end part of the second rotating arm far away from the rotating center of the second rotating arm, and the other end of the second connecting rod is connected with the moving contact assembly.

The knob and the locking piece rotate around a third shaft fixed on the shell.

The rotary knob comprises a shell, and is characterized in that a knob torsion spring used for driving the knob to reset is arranged on the shell, a first supporting block driven by one end of the knob torsion spring is arranged on the knob, a second supporting block supporting against the first supporting block is formed on the locking piece, one end of the knob torsion spring and one surface, away from the first supporting block, of the second supporting block are propped against, and the other end of the knob torsion spring and the shell are propped against.

The rotary wheel is rotatably provided with a lock catch and a jump buckle, and the lock catch and the jump buckle are respectively provided with a first buckle tooth and a second buckle tooth which can be matched and locked.

The lock catch and the rotating wheel are provided with a lock catch spring, a jump catch spring is arranged between the jump catch and the rotating wheel, and the lock catch spring and the jump catch spring are suitable for enabling the lock catch and the jump catch to keep a locking state.

The technical scheme of the utility model has the following advantages:

1. The utility model provides a miniature circuit breaker, wherein an energy storage kick assembly comprises a locking piece which rotates in linkage with a knob, a limiting piece which is rotatably arranged on a rotating wheel, and an energy storage spring which is arranged between the limiting piece and the rotating wheel; when the locking piece rotates to be matched with the limiting piece to stop the rotation of the limiting piece (namely, the moving contact assembly also stops rotating), the rotating wheel can continue to rotate relative to the limiting piece, and the energy storage spring stores energy; after the locking piece continues to rotate and the spacing piece separates, the energy storage spring releases energy to drive the moving contact and the fixed contact of moving contact subassembly at a less interval quick contact intercommunication through drive spacing piece and link assembly, improved the closing speed like this, reduced electric arc time, extension contact life, and the impact between the moving contact is limited by the elastic force of energy storage spring, and the impact is less, is difficult for appearing the moving contact and bounces repeatedly and the problem of extension electric arc duration.

2. The small-sized circuit breaker provided by the utility model has the advantages that the locking piece is provided with the locking surface which is arranged towards the limiting piece, and the limiting piece is provided with the limiting surface which is arranged corresponding to the locking piece, wherein the locking surface is separated from the limiting surface in a first state and a third state; in the second state, the locking surface and the limiting surface are in contact sliding friction, the limiting piece stops rotating, and the locking surface and the limiting surface which are matched with each other have the advantage of simple structure.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a miniature circuit breaker of the present utility model;

FIG. 2 is a perspective view of the operating mechanism and the contact mechanism;

FIG. 3 is a schematic view of an explosion structure of the locking member and the limiting member;

FIG. 4 is a schematic view of an assembly of a knob and a locking member;

FIG. 5 is a schematic view of an assembly of the wheel, shackle, strike and limiter;

Fig. 6 is a schematic view of an exploded construction of the operating mechanism.

Reference numerals illustrate: 1. a housing; 2. a stationary contact; 3. a moving contact assembly; 4. a knob; 5. a link rod; 6. a rotating wheel; 7. a locking member; 8. a limiting piece; 9. an energy storage spring; 10. a connecting rod assembly; 11. a moving contact; 12. a locking surface; 13. a limiting surface; 14. a first shaft; 15. a first link; 16. a third shaft; 17. a first rotating arm; 18. a second rotating arm; 19. a second shaft; 20. a second link; 21. a first abutment; 22. a second abutting block; 23. locking; 24. jumping buckle; 25. a first tooth; 26. a second buckling tooth; 27. a latch spring; 28. a trip spring; 29. a knob torsion spring.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

Examples

The present embodiment provides a miniature circuit breaker, as shown in fig. 1, including a housing 1, a contact mechanism, and an operating mechanism.

The contact mechanism comprises a fixed contact 2 fixed on a shell 1 and a movable contact assembly 3 rotatably mounted on the shell 1, wherein the movable contact assembly 3 comprises a movable contact frame and a movable contact 11 arranged on the movable contact frame, as shown in fig. 1.

The operating mechanism, as shown in fig. 2, includes a knob 4, a link 5, a runner 6, an energy storage kick assembly, and a link assembly 10.

The knob 4 is rotatably installed on the casing 1, and drives the runner 6 to rotate through the link 5, as shown in fig. 4, the knob 4 and the locking piece 7 are all rotated around the third shaft 16 fixed on the casing 1, in this embodiment, the casing 1 is provided with a knob torsion spring 29 for driving the knob 4 to reset, the knob 4 is provided with a first supporting block 21 driven by one end of the knob torsion spring 29, the locking piece 7 is formed with a second supporting block 22 supporting against the first supporting block 21, one end of the knob torsion spring 29 and one surface of the second supporting block 22, which is far away from the first supporting block 21, are propped against, and the other end of the knob torsion spring 29 is propped against the casing 1. As shown in fig. 5, the rotating wheel 6 is rotatably provided with a lock catch 23 and a jump button 24, and the lock catch 23 and the jump button 24 are respectively provided with a first button tooth 25 and a second button tooth 26 which can be locked in a matching way. A latch spring 27 is arranged between the latch 23 and the rotating wheel 6, a latch spring 28 is arranged between the latch 24 and the rotating wheel 6, and the latch spring 27 and the latch spring 28 are suitable for keeping the latch 23 and the latch 24 in a locking state. It should be noted that, the latch 23 and the latch 24 are well known in the art, and therefore the specific structure and the working principle thereof will not be described in detail.

The energy storage jump assembly, as shown in fig. 3, 5 and 6, comprises a locking piece 7 which rotates in linkage with the knob 4, a limiting piece 8 rotatably installed on the rotating wheel 6, and an energy storage spring 9 arranged between the limiting piece 8 and the rotating wheel 6, wherein the limiting piece 8 is connected with the moving contact assembly 3 through a connecting rod assembly 10, and the rotating wheel 6, the limiting piece 8 and the connecting rod assembly 10 all rotate around a first shaft 14. In the closing process, the limiting piece 8 has a first state of rotating in linkage with the rotating wheel 6 to drive the moving contact assembly 3 to rotate towards the closing direction, a second state of cooperating with the locking piece 7 to stop rotating, and a third state separated from the locking piece 7, wherein in the second state, the limiting piece 8 stops rotating, the rotating wheel 6 rotates relative to the limiting piece 8, and the energy storage spring 9 stores energy; in the third state, the energy storage spring 9 releases energy, and the moving contact 11 of the moving contact assembly 3 is driven to be in contact communication with the fixed contact 2 by driving the limiting piece 8 and the connecting rod assembly 10. In this embodiment, the locking member 7 is formed with a locking surface 12 disposed towards the limiting member 8, and the limiting member 8 is formed with a limiting surface 13 disposed corresponding to the locking surface 12, where the locking surface 12 is separated from the limiting surface 13 in the first state and the third state; in the second state, the locking surface 12 is in contact with the limiting surface 13 for sliding friction, and the limiting member 8 is kept in a stopped rotating state.

The connecting rod assembly 10, as shown in fig. 2 and 6, includes: a first link 15, which rotates around the first shaft 14, and has a first rotating arm 17 and a second rotating arm 18 extending outwards from the rotation center thereof and disposed at an included angle, wherein one end of the first rotating arm 17 away from the first shaft 14 is connected to the limiting member 8 through a second shaft 19; and one end of the second connecting rod 20 is rotatably connected with the end part of the second rotating arm 18 away from the rotating center, and the other end of the second connecting rod is connected with the moving contact assembly 3.

The closing process of the miniature circuit breaker is as follows:

When the switch is closed, the knob 4 rotates clockwise under the action of external force, the locking piece 7 rotates along with the knob 4, the knob 4 drives the rotating wheel 6 to rotate clockwise through the link rod, and the energy storage spring 9 is arranged between the rotating wheel 6 and the limiting piece 8, so that the limiting piece 8 and the first link rod 15 are driven to rotate clockwise around the first shaft 14, and the movable contact assembly 3 is driven to rotate anticlockwise through the second link rod 20;

When the locking piece 7 rotates to be in sliding contact with the limiting piece 8, the limiting piece 8 stops rotating under the friction force of the locking surface 12 and the limiting surface 13, so that the moving contact assembly 3 driven by the limiting piece 8 also stops rotating, at the moment, the moving contact 11 keeps a small distance from the fixed contact 2, the locking piece 7 and the rotating wheel 6 continue to rotate clockwise, and at the moment, the energy storage spring 9 stores energy;

When the locking piece 7 continues to rotate until the locking piece is separated from the limiting piece 8, the energy storage spring 9 releases energy, so that the limiting piece 8 and the connecting rod assembly 10 are rapidly driven to rotate, and the moving contact 11 is driven to be in rapid contact communication with the fixed contact 2.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims

1. A miniature circuit breaker, comprising:

The contact mechanism comprises a fixed contact (2) fixed on the shell (1) and a movable contact assembly (3) rotatably mounted on the shell (1);

The operation mechanism comprises a knob (4), a link rod (5), a rotating wheel (6) and an energy storage jump assembly, wherein the energy storage jump assembly comprises a locking piece (7) which rotates in linkage with the knob (4), a limiting piece (8) rotatably installed on the rotating wheel (6), and an energy storage spring (9) arranged between the limiting piece (8) and the rotating wheel (6), and the limiting piece (8) is connected with the movable contact assembly (3) through a connecting rod assembly (10);

In the closing process, the limiting piece (8) is provided with a first state which rotates in a linkage way with the rotating wheel (6) and drives the movable contact assembly (3) to rotate towards the closing direction, a second state which is matched with the locking piece (7) to stop rotating, and a third state which is separated from the locking piece (7), wherein in the second state, the limiting piece (8) stops rotating, the rotating wheel (6) rotates relative to the limiting piece (8), and the energy storage spring (9) stores energy; in the third state, the energy storage spring (9) releases energy, and the moving contact (11) of the moving contact assembly (3) is driven to be in contact communication with the fixed contact (2) through driving the limiting piece (8) and the connecting rod assembly (10).

2. The miniature circuit breaker according to claim 1, characterized in that the locking element (7) is formed with a locking surface (12) arranged towards the limiting element (8), the limiting element (8) being formed with a limiting surface (13) arranged in correspondence of the locking surface (12), wherein in the first and third state the locking surface (12) is separated from the limiting surface (13); in the second state, the locking surface (12) is in contact sliding friction with the limiting surface (13), and the limiting piece (8) stops rotating.

3. Miniature circuit breaker according to claim 1, characterized in that the runner (6), the limit piece (8) and the link assembly (10) are all turned around a first axis (14).

4. A miniature circuit breaker according to claim 3, characterized in that said linkage assembly (10) comprises:

The first connecting rod (15) rotates around the first shaft (14) and is provided with a first rotating arm (17) and a second rotating arm (18) which extend outwards from the rotation center of the first connecting rod and are arranged at a certain included angle, and one end of the first rotating arm (17) far away from the first shaft (14) is connected with the limiting piece (8) through a second shaft (19);

And one end of the second connecting rod (20) is rotationally connected with the end part of the second rotating arm (18) far away from the rotating center of the second connecting rod, and the other end of the second connecting rod is connected with the moving contact assembly (3).

5. Miniature circuit breaker according to claim 1, characterized in that the knob (4) and the locking element (7) are both turned around a third shaft (16) fixed to the housing (1).

6. The miniature circuit breaker according to claim 5, characterized in that a knob torsion spring (29) for driving the knob (4) to reset is arranged on the casing (1), the knob (4) is provided with a first abutting block (21) driven by one end of the knob torsion spring (29), the locking piece (7) is formed with a second abutting block (22) abutting against the first abutting block (21), one end of the knob torsion spring (29) abuts against one surface, away from the first abutting block (21), of the second abutting block (22), and the other end abuts against the casing (1).

7. Miniature circuit breaker according to claim 1, characterized in that the rotating wheel (6) is rotatably mounted with a lock catch (23) and a jump button (24), the lock catch (23) and the jump button (24) being provided with a first (25) and a second (26) locking tooth respectively.

8. The miniature circuit breaker according to claim 7, characterized in that a catch spring (27) is arranged between the catch (23) and the runner (6), a catch spring (28) is arranged between the catch (24) and the runner (6), the catch spring (27) and the catch spring (28) being adapted to keep the catch (23) and the catch (24) in a locked state.