CN212434565U

CN212434565U - Small-sized circuit breaker

Info

Publication number: CN212434565U
Application number: CN202021651127.7U
Authority: CN
Inventors: 周红兵
Original assignee: Zhejiang Youlu Electric Co ltd
Current assignee: Zhejiang Youlu Electric Co ltd
Priority date: 2020-08-10
Filing date: 2020-08-10
Publication date: 2021-01-29
Anticipated expiration: 2030-08-10

Abstract

The utility model provides a miniature circuit breaker, including locating between static contact and the bimetallic strip, can connect the electrically conductive piece of static contact and bimetallic strip, electrically conductive piece has the flexible conductive section that can link to each other with the bimetallic strip to and the movable contact board with flexible conductive section body coupling, wherein, movable contact board is plate-like by the partly press forming of the same flexible conductor at flexible conductive section place. Also, one part of the flexible conductor is used for pressing the movable contact plate, the other part of the flexible conductor is used for being directly connected with the bimetallic strip, and compared with the mode that the movable contact is firstly punched on the copper plate and then welded and connected with the flexible conductive piece in the prior art, the processing procedure is simpler, the production cost is reduced, the defects of insufficient solder, high temperature rise and the like caused by welding are overcome, the reliability is higher, and the service life is prolonged.

Description

Small-sized circuit breaker

Technical Field

The utility model relates to a circuit breaker technical field, concretely relates to miniature circuit breaker.

Background

The miniature circuit breaker refers to 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.

The contact mechanism of the existing miniature circuit breaker comprises a moving contact 01 arranged on a contact support 04 and a static contact arranged opposite to the moving contact 01, wherein the moving contact 01 rotates along with the contact support 04 in a linkage manner so as to be in contact connection or disconnection with the static contact, as shown in fig. 7, the moving contact 01 is connected with a bimetallic strip 03 through a flexible conductive piece 02, at present, the moving contact 01 is formed by punching a copper plate, the flexible conductive piece 02 is generally a copper braided belt or a copper flexible stranded wire, the flexible conductive piece 02 is connected with the moving contact 01 through welding, the welding process is complex, the production cost is high, and the defects of insufficient welding, temperature rise at welding spots and the like exist.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming moving contact among the prior art and passing through welded connection with flexible electrically conductive piece, leads to having manufacturing cost higher, and has the defect that rosin joint, solder joint department temperature rise are high to a low in production cost, the high miniature circuit breaker of reliability are provided.

Therefore, the utility model provides a miniature circuit breaker, including locating between static contact and the bimetallic strip, can connect the static contact with the electrically conductive piece of bimetallic strip, electrically conductive piece have the flexible conductive section that can link to each other with the bimetallic strip, and with flexible conductive section an organic whole movable contact board of connecting, wherein, movable contact board by the partly press forming of the same flexible conductor at flexible conductive section place is platelike.

The movable contact plate is formed by extrusion of part of the flexible conductor through cold heading.

The flexible conductor is a copper braided belt or a copper soft stranded wire.

The operating mechanism is suitable for driving the movable contact plate to be in contact connection with or disconnected from the fixed contact, the operating mechanism comprises a handle, a connecting rod, a contact support, a lock catch, a support elastic piece and a connecting rod elastic piece, and the handle is rotatably arranged on the shell; a link having a first end connectable to the handle and a second end connectable to a contact carrier; the contact support is rotatably arranged on the shell through a rotating shaft, the movable contact plate is arranged at the lower end of the contact support, a first channel allowing the connecting rod to penetrate through and move is formed at the upper end of the contact support, and a step driven by the second end of the connecting rod to drive the contact support to rotate is arranged in the middle of the first channel; the lock catch is rotatably arranged above the contact support and is provided with a first action position driven by the second end of the connecting rod to rotate and a second action position for driving the second end to be separated from the step under the action of external force; a holder elastic member having one end connected to the housing and the other end connected to the contact holder, for applying a biasing force to the contact holder toward a trip position; and the connecting rod elastic piece is arranged on the contact support and is used for applying a biasing force to the second end of the connecting rod to move towards the opening position.

Be equipped with multistage linkage on the hasp, multistage linkage includes: the first jack is arranged on the front surface of the lock catch and can be in adaptive insertion with the assembling shaft; the second jack is arranged on the back face of the lock catch, and the second jack is a long hole for inserting the other assembling shaft.

Contact support with be equipped with the drive between the hasp the combined structure of the quick separating brake of multistage linkage structure, combined structure includes: the driving block is arranged on the contact support; the first matching block is arranged on the lock catch and can be driven by the driving block to rotate when the contact support rotates towards the direction of the opening position.

And a positioning structure which is suitable for enabling the first matching block and the driving block to be installed according to a set assembling position is arranged between the contact support and the lock catch, and the positioning structure comprises a positioning hole arranged on the lock catch and a convex shaft which is arranged on the contact support and can be inserted into the positioning hole.

The support elastic part is a tension spring, one end of the tension spring is connected with a first mounting column on the shell in a hooking mode, and the other end of the tension spring is connected with a hanging hole of the contact support in a hooking mode.

The connecting rod elastic part is a torsion spring sleeved on the second mounting column of the contact support, and the torsion spring is provided with a torsion spring main body part mounted on the second mounting column and an elastic arm extending to the upper part of the first channel and capable of abutting against the second end of the connecting rod.

The lower extreme of hasp is equipped with the second cooperation piece that can set up with electromagnetism shedding mechanism's push rod is relative, the shaping has the perforation that supplies two golden pull rods to wear to establish on the second cooperation piece.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a miniature circuit breaker, electrically conductive piece has the flexible conducting segment that can link to each other with the bimetallic strip, and the movable contact board with flexible conducting segment body coupling, wherein, movable contact board is for platelike by the partly press forming of the same flexible conductor at flexible conducting segment place, also some of flexible conductor is used for pressing the movable contact board, another part is used for directly linking to each other with the bimetallic strip, earlier extrude the moving contact on the copper material among the prior art, compare moving contact and the flexible mode of electrically conductive piece welded connection again, manufacturing procedure is simpler like this, the production cost is reduced, and avoided because of the rosin joint that the welding brought, defects such as temperature rise height, the reliability is higher, service life has been prolonged.

2. The utility model provides a miniature circuit breaker is equipped with multistage linkage structure on the hasp, and when multistage circuit breaker need link, the axle is assembled to the accessible and two hasps of two adjacent circuit breakers are connected to can realize multistage circuit breaker synchronization action, satisfy customer's different demands.

3. The utility model provides a miniature circuit breaker is equipped with the integrated configuration of the quick separating brake of multistage linkage structure of drive between contact carrier and the hasp, and integrated configuration includes: the driving block is arranged on the contact support; the first matching block is arranged on the lock catch and can be driven to rotate by the driving block when the contact support rotates towards the direction of the opening position. When separating brake, because the separating brake effort that electromagnetic tripping device push rod or two golden pull rods put in the hasp is all less, consequently difficult synchronous separating brake of multistage circuit breaker of drive through multistage linkage structure, and through setting up drive block and first cooperation piece, contact support is under the great restoring force effect of support elastic component during towards separating brake position rotation, contact support can drive the hasp action fast, and then drive multipolar circuit breaker synchronous action through multistage linkage structure, also multistage linkage structure can realize the quick action with the help of the great effort of support elastic component, the reliability is higher.

4. The utility model provides a miniature circuit breaker still is equipped with between contact carrier and the hasp and is suitable for to make first cooperation piece and drive block according to the location structure of setting for the mounted position installation, and location structure is including locating the locating hole on the hasp to and locate the protruding axle that can peg graft with the locating hole on the contact carrier, can avoid installer to adorn wrong position of hasp on contact carrier like this, improved production efficiency.

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 embodiments or the technical solutions in 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 for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

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

FIG. 2 is a schematic view of the structure of FIG. 1 with the housing removed;

FIG. 3 is a schematic view of the assembly of the contact support, the moving contact and the link elastic member;

FIG. 4 is a front view of the latch;

FIG. 5 is a rear view of the latch;

FIG. 6 is a schematic structural diagram of a conductive device;

fig. 7 is a perspective view of a contact support, a moving contact, a flexible conductive member, and a bimetal in the prior art.

Description of reference numerals: 01. a moving contact; 02. a flexible conductive member; 03. a bimetal; 04. a contact holder;

1. static contact; 2. a bimetal; 3. a conductive member; 31. a flexible conductive segment; 32. a movable contact plate; 4. a handle; 5. a connecting rod; 51. a first end; 52. a second end; 53. a link elastic member; 54. a torsion spring main body portion; 55. a resilient arm; 6. a contact holder; 61. a first channel; 62. a step; 63. a bracket elastic member; 64. a drive block; 65. a protruding shaft; 66. hanging holes; 67. a second mounting post; 7. locking; 71. a first jack; 72. a second jack; 73. a first mating block; 74. positioning holes; 75. a second mating block; 8. a push rod; 9. a housing; 90. a rotating shaft; 91. a first mounting post.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to 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", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific 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 is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can 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 a contact mechanism, an operating mechanism, an electromagnetic tripping mechanism and a thermal tripping mechanism.

The contact mechanism, as shown in fig. 1 and 6, includes a fixed contact 1 and a movable contact plate 32 disposed opposite to the fixed contact 1, the movable contact plate 32 is connected to a bimetallic strip 2 of a thermal trip mechanism through a flexible conductive segment 31, in this embodiment, the flexible conductive segment 31 is integrally connected to the movable contact plate 32, the movable contact plate 32 is formed by extrusion molding of a part of the same flexible conductor where the flexible conductive segment 31 is located through a cold heading process into a plate shape, that is, a part of the flexible conductor is used to press the movable contact plate 32, and another part is used to directly connect to the bimetallic strip, and the flexible conductor is a copper braid or a copper soft stranded wire.

And the operating mechanism is used for driving the movable contact plate 32 to be in contact with or disconnected from the fixed contact 1, and as shown in fig. 1 to 5, the operating mechanism comprises a handle 4, a connecting rod 5, a contact bracket 6, a lock catch 7, a bracket elastic piece 63 and a connecting rod elastic piece 53.

The handle 4 is rotatably arranged on the shell 9, and a slot is formed on the handle 4.

And a connecting rod 5 having a first end 51 connectable to the handle 4 and a second end 52 connectable to the contact support 6, wherein the connecting rod 5 is a U-shaped rod and the first end 51 is adapted to be inserted into the slot of the handle 4.

The contact holder 6 is rotatably mounted on the housing 9 through a rotating shaft 90, as shown in fig. 3, the lower end of the contact holder is provided with the movable contact plate 32, the upper end of the contact holder is formed with a first channel 61 allowing the second end 52 of the connecting rod 5 to penetrate through and move, the middle of the first channel 61 is provided with a step 62 driven by the second end 52 of the connecting rod 5 to drive the contact holder 6 to rotate, the contact holder 6 is further provided with a driving block 64 capable of being matched with the latch 7, and a protruding shaft 65 for positioning the mounting position of the latch 7, and the protruding shaft 65 is located between the driving block 64 and the rotating shaft 90. In this embodiment, the rotating shaft 90 is a metal shaft.

The lock catch 7 is rotatably mounted above the contact support 6 through a rotating shaft 90, and the lock catch 7 has a first action position driven by the second end 52 of the connecting rod 5 to rotate and a second action position driven by an external force to separate the second end 52 from the step 62. As shown in fig. 2, 4 and 5, the latch 7 is provided with a first engaging block 73 and a positioning hole 74, the first engaging block 73 can be driven by the driving block 64 to rotate when the contact holder 6 rotates toward the opening position, and the positioning hole 74 can be inserted by the protruding shaft 65, so that the first engaging block 73 is positioned on the left side of the driving block 64 as shown in fig. 2. Be equipped with multistage linkage on hasp 7, multistage linkage includes: the first jack 71 is arranged on the front surface of the lock catch 7 and can be in adaptive splicing with the splicing shaft; the second insertion hole 72 is formed in the back surface of the lock catch 7, and the second insertion hole 72 is a long hole into which another assembling shaft can be inserted. The lower extreme of hasp 7 is equipped with the second cooperation piece 75 that can set up with electromagnetism shedding mechanism's push rod 8 is relative, the shaping has the perforation that supplies two golden pull rods to wear to establish on the second cooperation piece 75.

Support elastic component 63, one end with casing 9 is connected, the other end with contact carrier 6 connects, be used for to contact carrier 6 applies the biasing force towards the movement of separating brake position, and in this embodiment, support elastic component 63 is the extension spring, the one end of extension spring with first erection column 91 hook on the casing 9 is connected, the other end with contact carrier 6's hanging hole 66 hook is connected.

The connecting rod elastic member 53 is a torsion spring sleeved on the second mounting column 67 of the contact support 6, and the torsion spring has a torsion spring main body portion 54 mounted on the second mounting column 67, and an elastic arm 55 extending to the upper side of the first channel 61 and capable of abutting against the second end 52 of the connecting rod 5.

The utility model discloses a miniature circuit breaker, electrically conductive piece 3 has the flexible conducting segment 31 that can link to each other with bimetallic strip 2, and the movable contact plate 32 with flexible conducting segment 31 body coupling, wherein, movable contact plate 32 is for platelike by the partly press forming of the same flexible conductor at flexible conducting segment 31 place, also some of the flexible conductor is used for pressing movable contact plate 32, another part is used for directly linking to each other with bimetallic strip 2, with prior art in earlier the moving contact of punching out on the copper material, compare moving contact and flexible electrically conductive piece welded connection's mode again, manufacturing procedure is simpler like this, the production cost is reduced, and avoided because of the rosin joint that the welding brought, defects such as temperature rise, the reliability is higher, service life has been prolonged.

The utility model discloses a miniature circuit breaker's theory of operation as follows:

when closing the switch:

the handle 4 rotates clockwise, the connecting rod 5 abuts against the step 62 of the contact support 6, the contact support 6 is driven to rotate clockwise around the rotating shaft 90 until the movable contact plate 32 arranged on the contact support 6 is communicated with the static contact 1 in a contact mode, at the moment, the support elastic part 63 accumulates energy, the connecting rod 5 abuts against the top of the lock catch 7 in the moving process, and the lock catch 7 is driven to rotate clockwise around the rotating shaft 90.

When the brake is opened:

the lock catch 7 is driven by a double-gold pull rod or a push rod 8 of the electromagnetic tripping mechanism to rotate anticlockwise to a tripping position, so that the second end 52 of the connecting rod 5 is separated from the step 62 on the contact support 6, after the contact support 6 loses the jacking force of the connecting rod 5, the support elastic part 63 releases energy to drive the contact support 6 to rotate anticlockwise, and the connecting rod 5 returns to a tripping position under the action of the connecting rod elastic part 53.

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 can be made without departing from the scope of the invention.

Claims

1. A miniature circuit breaker comprises a conductive piece (3) which is arranged between a static contact (1) and a bimetallic strip (2) and can connect the static contact (1) and the bimetallic strip (2), and is characterized in that the conductive piece (3) is provided with a flexible conductive section (31) which can be connected with the bimetallic strip (2) and a movable contact plate (32) which is integrally connected with the flexible conductive section (31), wherein the movable contact plate (32) is pressed and formed into a plate shape by one part of the same flexible conductor where the flexible conductive section (31) is located.

2. A miniature circuit breaker as set forth in claim 1 wherein said movable contact plate (32) is formed by cold heading extrusion of a portion of said flexible conductor.

3. A miniature circuit breaker according to claim 1 or 2, wherein said flexible conductor is a copper braid or a copper twisted wire.

4. A miniature circuit breaker according to claim 3, further comprising an operating mechanism adapted to drive said movable contact plate (32) into and out of contact with said stationary contact (1), said operating mechanism comprising:

a handle (4) rotatably mounted on the housing (9);

a connecting rod (5) having a first end (51) connectable to the handle (4) and a second end (52) connectable to the contact carrier (6);

the contact support (6) is rotatably arranged on the shell (9) through a rotating shaft (90), the lower end of the contact support is provided with the movable contact plate (32), the upper end of the contact support is provided with a first channel (61) allowing the connecting rod (5) to penetrate through and moving, and the middle part of the first channel (61) is provided with a step (62) which is driven by the second end (52) of the connecting rod (5) to drive the contact support (6) to rotate;

the lock catch (7) is rotatably arranged above the contact support (6), and the lock catch (7) is provided with a first action position driven by the second end (52) of the connecting rod (5) to rotate and a second action position driving the second end (52) to be separated from the step (62) under the action of external force;

a holder elastic member (63) having one end connected to the housing (9) and the other end connected to the contact holder (6) and configured to apply a biasing force to the contact holder (6) toward a trip position;

and the connecting rod elastic piece (53) is arranged on the contact support (6) and is used for applying a biasing force to the second end (52) of the connecting rod (5) to move towards the opening position.

5. The miniature circuit breaker according to claim 4, wherein said latch (7) is provided with a multi-stage linkage structure, said multi-stage linkage structure comprising:

the first jack (71) is arranged on the front surface of the lock catch (7) and can be in adaptive insertion with the assembling shaft;

the second insertion hole (72) is formed in the back face of the lock catch (7), and the second insertion hole (72) is a long hole into which the other assembling shaft can be inserted.

6. The miniature circuit breaker according to claim 5, wherein a coupling structure for driving said multistage linkage structure to rapidly open and close is provided between said contact holder (6) and said latch (7), said coupling structure comprising:

the driving block (64) is arranged on the contact support (6);

the first matching block (73) is arranged on the lock catch (7), and the first matching block (73) can be driven to rotate by the driving block (64) when the contact support (6) rotates towards the direction of the opening position.

7. The miniature circuit breaker according to claim 6, wherein a positioning structure adapted to allow the first mating block (73) and the driving block (64) to be mounted at a predetermined mounting position is further provided between the contact holder (6) and the latch (7), and the positioning structure comprises a positioning hole (74) provided in the latch (7), and a protruding shaft (65) provided in the contact holder (6) and adapted to be inserted into the positioning hole (74).

8. The miniature circuit breaker according to any of claims 4-7, wherein said cradle spring (63) is a tension spring having one end hooked to said first mounting post (91) on said housing (9) and the other end hooked to said hanging hole (66) of said contact cradle (6).

9. The miniature circuit breaker as recited in claim 8, wherein said link elastic member (53) is a torsion spring sleeved on said second mounting post (67) of said contact support (6), said torsion spring having a torsion spring main body portion (54) mounted on said second mounting post (67), and an elastic arm (55) extending above said first channel (61) and capable of abutting against said second end (52) of said link (5).

10. The miniature circuit breaker according to claim 9, wherein a second fitting block (75) capable of being disposed opposite to the push rod (8) of the electromagnetic trip mechanism is disposed at the lower end of the latch (7), and a through hole for the bimetallic pull rod to pass through is formed on the second fitting block (75).