CN115050615A - Operating mechanism of miniature circuit breaker and miniature circuit breaker - Google Patents

Abstract

The invention provides an operating mechanism of a small-sized circuit breaker and the small-sized circuit breaker, the operating mechanism includes: the handle is rotatably arranged on the shell; the connecting rod is provided with a first end connected with the handle and a second end connected with the jump buckle; a contact support rotatably mounted to the housing by a first connecting shaft; the jump buckle and the lock catch are respectively rotatably arranged on the contact support through a second connecting shaft and a third connecting shaft, a matching structure is arranged between the jump buckle and the lock catch, and the matching structure comprises a first convex block arranged on the jump buckle and a second convex block arranged on the lock catch; when short circuit or overload occurs, the lock catch moves towards the opening direction under the action of external force, the second convex block is abutted against the first convex block to drive the trip buckle to rotate towards the opening direction, and the rotating center of the second end of the connecting rod spans from the lower side of a connecting line of the rotating center of the first end and the rotating center of the trip buckle to the upper side; the jump buckle elastic piece is suitable for driving the jump buckle to reset towards the brake separating direction; and the supporting elastic piece is suitable for driving the contact to support the reset towards the opening direction.

Description

Operating mechanism of miniature circuit breaker and miniature circuit breaker

Technical Field

The invention relates to the technical field of low-voltage electric appliances, in particular to an operating mechanism of a small circuit breaker and the small circuit breaker.

Background

The miniature circuit breaker is a protective electric appliance installed on a terminal distribution line and is mainly used for overload and short-circuit protection of lines and electric equipment.

An operating mechanism of an existing miniature circuit breaker, as shown in fig. 6, mainly includes a handle 01, a connecting rod 02, a contact support 03, a jump buckle 04, a lock catch 05 and a support elastic member, where the jump buckle 04 and the lock catch 05 are both rotatably mounted on the contact support 03, and a buckle structure is disposed between the jump buckle 04 and the lock catch 05, as shown in fig. 7, the buckle structure includes a first buckle 06 disposed on the jump buckle 04, and a second buckle 07 disposed on the lock catch 05 and capable of being matched and abutted against the first buckle 06. In the closing process, the handle 01 rotates clockwise, the first hasp 06 and the second hasp 07 of the trip buckle 04 are driven to abut against through the connecting rod 02, the trip buckle 04, the lock buckle 05 and the contact support 03 form a linkage rotating mechanism assembly, the mechanism assembly integrally rotates clockwise towards the closing direction, and at the moment, the support elastic part stores energy; when short circuit or overload occurs, the lock catch 05 rotates counterclockwise under the action of external force, and when the second buckle 07 is separated from the first buckle 06, the support elastic part releases energy, so that the contact support 03 is driven to rotate counterclockwise in the opening direction. Considering that the first hasp 06 and the second hasp 07 need hasp matching, the requirement for the assembling precision of the hasp structure is high, and after long-time use, the hasp structure is easy to lose hasp effect due to abrasion, so that the operation mechanism can not realize opening and closing actions.

Disclosure of Invention

Therefore, the technical problem to be solved by the present invention is to overcome the defects that the operating mechanism of the small circuit breaker in the prior art has high requirement on the dimensional accuracy of the hasp structure and is easy to wear after long-time use to cause the failure of the operating mechanism, so as to provide the operating mechanism of the small circuit breaker and the small circuit breaker with simple structure and high reliability.

Therefore, the invention provides an operating mechanism of a miniature circuit breaker, which comprises a handle, a connecting rod, a contact support, a jump buckle, a lock catch, a jump buckle elastic element and a support elastic element. The handle is rotatably arranged on the shell; the connecting rod is provided with a first end connected with the handle and a second end connected with the jump buckle; the contact support is rotatably arranged on the shell through a first connecting shaft; the jump buckle and the lock catch are respectively rotatably arranged on the contact support through a second connecting shaft and a third connecting shaft, a matching structure is arranged between the jump buckle and the lock catch, and the matching structure comprises a first convex block arranged on the jump buckle and a second convex block arranged on the lock catch; in the process of closing, the first convex block abuts against the second convex block, and the tripping buckle, the lock catch and the contact support form a mechanism assembly and rotate towards the closing direction under the driving of the connecting rod; when short circuit or overload occurs, the lock catch moves towards the opening direction under the action of external force, the second bump is abutted against the first bump to drive the trip buckle to rotate towards the opening direction, and the rotating center of the second end of the connecting rod spans from the lower side to the upper side of a connecting line of the rotating center of the first end and the rotating center of the trip buckle; the jump buckle elastic piece is connected with the jump buckle and is suitable for driving the jump buckle to reset towards the brake separating direction; and the supporting elastic piece is connected with the contact support and is suitable for driving the contact support to reset towards the opening direction.

The contact support structure also comprises a limiting structure for preventing the jump buckle from being separated from the contact support.

The limit structure comprises a stop block which is arranged on the lock buckle and extends towards the jump buckle direction, and the stop block can be abutted against one surface of the jump buckle, which is far away from the contact support.

The contact support is provided with at least one stop column which is abutted against the lock catch when the switch is switched on so as to enable the contact support and the trip buckle to rotate in a linkage manner.

The bumping post is arranged on one side of the lock catch far away from the jump buckle and is perpendicular to the contact support, and the bumping post is suitable for the hook connection of the support elastic part.

The contact support is provided with a mounting groove which is arranged around the stop column and is suitable for mounting the hook.

The jump buckle elastic piece is a torsion spring, one end of the torsion spring is propped against the contact support, and the other end of the torsion spring is suitable for being inserted into the second jack of the jump buckle.

The third connecting shaft is positioned between the first connecting shaft and the second connecting shaft.

The contact support is provided with a first jack for inserting one end of the bimetallic pull rod, and the edge of the first jack is provided with a third bump which is abutted against the bimetallic pull rod main body when tripping.

The invention also provides a miniature circuit breaker, which comprises a contact mechanism and the operating mechanism of the miniature circuit breaker, wherein the contact mechanism comprises a moving contact arranged on the contact support and a static contact arranged opposite to the moving contact, a conductive component connected with the static contact is arranged on the shell, and the conductive component comprises: a coil; the two wiring boards are respectively arranged on two sides of the coil, and the wiring board adjacent to one side of the moving contact is provided with the fixed contact.

The coil is made of aluminum or aluminum alloy, and the wiring board is made of one of copper, copper alloy, iron alloy, aluminum alloy, copper-aluminum composite board and aluminum-iron composite board.

The technical scheme of the invention has the following advantages:

1. according to the operating mechanism of the miniature circuit breaker, in the closing process, the handle rotates clockwise, the rotating center of the second end of the connecting rod is located on the lower side of the connecting line of the rotating center of the first end and the rotating center of the trip buckle (namely below the dead point position of the mechanism), the connecting rod can apply acting force to the first convex block of the trip buckle to enable the first convex block to be abutted against the second convex block of the lock catch, the trip buckle, the lock catch and the contact support form a mechanism assembly, and the mechanism assembly rotates clockwise around the first connecting shaft under the driving of the connecting rod, so that closing is achieved; when short circuit or overload occurs, the lock catch rotates anticlockwise around the third connecting shaft under the action of external force, the jump buckle is driven to rotate clockwise around the second connecting shaft after a second convex block of the lock catch abuts against a first convex block of the jump buckle, the connecting rod drives the jump buckle to rotate clockwise after a rotation center of a second end of the connecting rod crosses over from the lower side of a connecting line of the rotation center of the first end and the rotation center of the jump buckle to the upper side, namely, the dead point of a mechanism is crossed, the contact support rotates towards the opening direction under the action of the support elastic piece after the first convex block of the jump buckle is separated from the second convex block of the lock catch, and the jump buckle resets under the action of the jump buckle elastic piece. The operating mechanism of the miniature circuit breaker has the closing principle similar to that of the prior art, but the opening principle is different from that of the hasp in the prior art, so that the requirement on the assembly precision of the tripping buckle and the hasp is lower, the structure is simpler, the reliability is improved, and the service life of the operating mechanism is prolonged.

2. The operating mechanism of the miniature circuit breaker provided by the invention has the advantages that the lock catch is provided with the stop block extending to the upper part of the jump buckle, and the stop block can be abutted against one surface of the jump buckle far away from the contact support, so that the jump buckle is prevented from being separated from the contact support, and the reliability is further improved.

3. According to the operating mechanism of the miniature circuit breaker, when the miniature circuit breaker is switched on, the side face of the lock catch is abutted against the stop pillar supported by the contact, so that the trip catch, the lock catch and the contact support form a mechanism assembly, the mechanism assembly integrally rotates around the first connecting shaft under the driving of the connecting rod, meanwhile, the stop pillar can also be used for hooking and connecting a hook supporting the elastic piece, namely, the same stop pillar can play two roles, the structure is simpler, and the production cost is reduced.

4. According to the operating mechanism of the miniature circuit breaker, the third connecting shaft is located between the first connecting shaft and the second connecting shaft, and compared with the mode that the rotation centers of the lock catch and the contact support are overlapped in the prior art, the moment arm distance between the tripping stress part of the lock catch and the third connecting shaft (the third connecting shaft is the lock catch rotation center) is increased, so that the lock catch is easier to trip, and the product stability is improved.

5. According to the operating mechanism of the miniature circuit breaker, the contact support is provided with the first jack into which one end of the double-gold pull rod is inserted, the edge of the first jack is provided with the third bump which is abutted against the double-gold pull rod main body during tripping, and the third bump can increase the force arm distance between the double-gold pull rod and the rotating center of the lock catch, so that the lock catch is easier to trip, and the stability of a product is improved.

6. According to the miniature circuit breaker provided by the invention, the coil is made of aluminum or aluminum alloy, and compared with the mode that the coil in the prior art is made of copper, the production cost is lower.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural view of a miniature circuit breaker of the present invention in an open state;

FIG. 2 is a schematic structural diagram of an operating mechanism of the small and medium sized circuit breaker of FIG. 1;

FIG. 3 is a schematic view of the assembly of the contact support, the jumper and the latch;

FIG. 4 is an exploded view of the contact support, jumper and latch;

FIG. 5 is a schematic view of the construction of the second end of the connecting rod about to cross the dead center position during a short circuit or overload;

FIG. 6 is a schematic structural diagram of a small and medium sized circuit breaker in the prior art;

fig. 7 is a schematic structural diagram of a jump buckle and a lock catch in the prior art.

Description of reference numerals: 01. a handle; 02. a connecting rod; 03. a contact support; 04. jumping and buckling; 05. locking; 06. a first buckle; 07. a second buckle;

1. a handle; 2. a housing; 3. a connecting rod; 4. a first end; 5. a second end; 7. a contact support; 8. a first connecting shaft; 9. jumping and buckling; 10. locking; 11. a first bump; 12. a second connecting shaft; 13. a third connecting shaft; 14. a second bump; 15. a jump buckle elastic member; 16. a supporting elastic member; 17. a stopper; 18. a bumping post; 19. a moving contact; 20. static contact; 21. a coil; 22. a wiring board; 23. hooking; 24. mounting grooves; 25. a second jack; 26. a bimetallic pull rod; 27. a first jack; 28. and a third bump.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. 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 invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Examples

The embodiment provides a miniature circuit breaker, which comprises an operating mechanism, a contact mechanism and a conductive assembly.

The operating mechanism, as shown in fig. 1 and 2, includes a handle 1, a link 3, a contact support 7, a jumper 9, a latch 10, a jumper spring 15, and a support spring 16.

The handle 1 is rotatably mounted on the housing 2, and a handle torsion spring (not shown in the figure) for driving the handle 1 to reset is arranged on the housing 2.

The contact support 7 is rotatably installed on the shell 2 through the first connecting shaft 8, the second connecting shaft 12, the third connecting shaft 13 and the two blocking columns 18 are formed on the contact support 7, the blocking columns 18 are arranged on one side, far away from the jump buckle 9, of the lock catch 10 and perpendicular to the contact support 7, and installation grooves 24 which are arranged around the blocking columns 18 and suitable for installing the hooks 23 are formed on the contact support 7. The contact support 7 is provided with a first insertion hole 27 for inserting one end of a bimetallic pull rod 26, and the edge of the first insertion hole 27 is provided with a third bump 28 which is abutted against the body of the bimetallic pull rod 26 when tripping. A waist-shaped hole which is used for the first connecting shaft 8 to penetrate and can move relative to the contact support 7 is formed in the middle of the contact support.

A connecting rod 3 having a first end 4 connected to the handle 1 and a second end 5 connected to a jump buckle 9.

The jump buckle 9 and the lock catch 10 are respectively rotatably mounted on the contact support 7 through a second connecting shaft 12 and a third connecting shaft 13 as shown in fig. 3 and 4, a matching structure is arranged between the jump buckle 9 and the lock catch 10, and the matching structure comprises a first bump 11 arranged on the jump buckle 9 and a second bump 14 arranged on the lock catch 10; in the process of closing, the first projection 11 abuts against the second projection 14, the trip catch 9, the lock catch 10 and the contact support 7 form a mechanism component, and the mechanism component is driven by the connecting rod 3 to rotate clockwise around the first connecting shaft 8; when short circuit or overload occurs, the lock catch 10 moves counterclockwise around the third connecting shaft 13 under the driving of the push rod or the double-gold pull rod of the short circuit tripping mechanism, the second bump 14 abuts against the first bump 11 to drive the trip buckle 9 to rotate towards the opening direction, and the rotation center of the second end 5 of the connecting rod 3 spans from the lower side to the upper side of the connecting line of the rotation center of the first end 4 and the rotation center of the trip buckle 9, and it should be noted that the connecting line of the rotation center of the first end 4 and the rotation center of the trip buckle 9 is the mechanism dead point position. The lock catch 10 is provided with a limiting structure suitable for stopping the jump buckle 9 and the contact support 7 from separating, the limiting structure comprises a stop block 17 which is arranged on the lock catch 10 and extends towards the jump buckle 9, and the stop block 17 can abut against one surface of the jump buckle 9, which is far away from the contact support 7. In this embodiment, the third connecting shaft 13 is located between the first connecting shaft 8 and the second connecting shaft 12, and compared with a manner that a rotation center of the latch and a rotation center of the contact support coincide with each other in the prior art, a moment arm distance between a trip stress part of the latch 10 and the third connecting shaft 13 (the third connecting shaft is the latch rotation center) is increased, so that the latch 10 is more easily tripped, and product stability is increased, and the trip stress part is located at the lower end of the latch 10 and can be matched with a push rod or a bimetallic pull rod of the short circuit trip mechanism. A through hole is formed in the middle of the lock catch 10 for the first connecting shaft 8 to pass through and the lock catch 8 to move relative to the first connecting shaft 8.

And the jump buckle elastic piece 15 is connected with the jump buckle 9 and is suitable for driving the jump buckle 9 to reset towards the opening direction, in the embodiment, the jump buckle elastic piece 15 is a torsion spring, one end of the torsion spring is propped against the contact support 7, and the other end of the torsion spring is suitable for being inserted into the second jack 25 of the jump buckle 9.

And one end of the supporting elastic piece 16 is connected with the shell 1 in a hooking mode, the other end of the supporting elastic piece is connected with a stop column 18 on the contact support 7 in a hooking mode, and the supporting elastic piece 16 is suitable for driving the contact support 7 to reset towards the opening direction.

The contact mechanism comprises a moving contact 19 arranged on the contact support 7 and a fixed contact 20 arranged opposite to the moving contact 19.

The conductive assembly includes: a coil 21; and the two wiring boards 22 are respectively arranged at two sides of the coil 21, and the fixed contact 20 is arranged on the wiring board 22 adjacent to one side of the movable contact 19. The coil 21 is made of aluminum or aluminum alloy, and the wiring board 22 is made of one of copper, copper alloy, iron alloy, aluminum alloy, copper-aluminum composite board and aluminum-iron composite board.

The operating principle of the operating mechanism of the miniature circuit breaker is as follows:

in the closing process, the handle 1 rotates clockwise, the rotation center of the second end 5 of the connecting rod 3 is positioned below the dead point position of the mechanism, the connecting rod 3 can apply acting force to the first convex block 11 of the trip buckle 9 to enable the first convex block to be abutted against the second convex block 14 of the lock catch 10, the trip buckle 9, the lock catch 10 and the contact support 3 form a mechanism assembly, and the mechanism assembly rotates clockwise around the first connecting shaft 8 under the driving of the connecting rod 3, so that the closing is realized.

When a short circuit or overload occurs, as shown in fig. 5, the latch 10 rotates counterclockwise around the third connecting shaft 13 under the action of the push rod of the short circuit trip mechanism or the bimetallic pull rod of the overload protection mechanism, the second bump 14 of the latch 10 abuts against the first bump 11 of the jump buckle 9, the jump buckle 9 is driven to rotate clockwise around the second connecting shaft 12, when the rotation center of the second end 5 of the connecting rod 3 crosses from the lower side (mechanism dead point position) of the connection line between the rotation center of the first end 4 and the rotation center of the jump buckle 9 to the upper side, that is, after the rotation center passes the mechanism dead point position, the connecting rod 3 drives the jump buckle 9 to rotate clockwise, after the first bump 11 of the jump buckle 9 is separated from the second bump 14 of the latch 10, the contact support 7 rotates in the opening direction under the action of the support elastic member 16, and the jump buckle 9 resets under the action of the jump buckle elastic member 15.

It should be noted that the short circuit trip mechanism and the overload protection mechanism are the existing mature technologies, and therefore, the detailed structure and the working principle thereof are not described in detail.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (10)

1. An operating mechanism of a small-sized circuit breaker, comprising:

the handle (1) is rotatably arranged on the shell (2);

a connecting rod (3) having a first end (4) connected to the handle (1) and a second end (5) connected to a jump buckle (9);

a contact support (7) rotatably mounted on the housing (2) by a first connecting shaft (8);

the jump buckle (9) and the lock catch (10) are respectively and rotatably mounted on the contact support (7) through a second connecting shaft (12) and a third connecting shaft (13), a matching structure is arranged between the jump buckle (9) and the lock catch (10), and the matching structure comprises a first convex block (11) arranged on the jump buckle (9) and a second convex block (14) arranged on the lock catch (10); in the process of closing, the first convex block (11) is abutted against the second convex block (14), and the tripping buckle (9), the lock catch (10) and the contact support (7) form a mechanism assembly and rotate towards the closing direction under the driving of the connecting rod (3); when short circuit or overload occurs, the lock catch (10) acts towards the opening direction under the action of external force, the second bump (14) is abutted against the first bump (11) to drive the trip buckle (9) to rotate towards the opening direction, and the rotation center of the second end (5) of the connecting rod (3) spans from the lower side to the upper side of a connecting line of the rotation center of the first end (4) and the rotation center of the trip buckle (9);

the jump buckle elastic piece (15) is connected with the jump buckle (9) and is suitable for driving the jump buckle (9) to reset towards the brake separating direction;

and the supporting elastic piece (16) is connected with the contact support (7) and is suitable for driving the contact support (7) to reset towards the opening direction.

2. The operating mechanism of a small size circuit breaker according to claim 1, further comprising a stopper structure for preventing the trip catch (9) from being separated from the contact supporter (7).

3. The operating mechanism of a miniature circuit breaker according to claim 2, wherein said limiting structure comprises a stop (17) disposed on said latch (10) and extending towards said jumper (9), said stop (17) being capable of abutting against a surface of said jumper (9) remote from said contact support (7).

4. The operating mechanism of a miniature circuit breaker according to any of claims 1-3 wherein said contact support (7) is provided with at least one stop (18) which abuts against said latch (10) when closing to allow said contact support (7) and said trip catch (9) to rotate in an interlocking manner.

5. Operating mechanism of a miniature circuit breaker according to claim 4 wherein said catch (18) is provided on a side of said latch (10) remote from said trip catch (9), said catch (18) being adapted for hooking engagement by a hook (23) of said supporting spring (16).

6. Operating mechanism of a small circuit breaker according to any of claims 1-5 characterized in that the third connecting shaft (13) is located between the first connecting shaft (8) and the second connecting shaft (12).

7. The operating mechanism of a small size circuit breaker according to any one of claims 1-6, characterized in that the contact support (7) has a first receptacle (27) for the insertion of one end of the bimetallic tie (26), the edge of the first receptacle (27) being provided with a third projection (28) against the body of the bimetallic tie (26) when tripped.

8. The operating mechanism of a small size circuit breaker according to any one of claims 1-6, wherein the trip resilient member (15) is a torsion spring having one end abutting against the contact support (7) and the other end adapted to be inserted into the second insertion hole (25) of the trip (9).

9. A miniature circuit breaker, characterized in that it comprises a contact mechanism and an operating mechanism of the miniature circuit breaker according to any one of claims 1-8, wherein the contact mechanism comprises a moving contact (19) disposed on the contact support (7) and a stationary contact (20) disposed opposite to the moving contact (19), a conductive component connected to the stationary contact (20) is disposed on the housing (2), and the conductive component comprises:

a coil (21);

the two wiring boards (22) are respectively arranged at two sides of the coil (21), and the wiring board (22) adjacent to one side of the movable contact (19) is provided with the fixed contact (20).

10. The miniature circuit breaker as recited in claim 9, wherein said coil (21) is made of aluminum or aluminum alloy, and said wiring board (22) is made of one of copper, copper alloy, iron alloy, aluminum alloy, copper-aluminum composite board and aluminum-iron composite board.

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