GB2552628A

GB2552628A - Breaker

Info

Publication number: GB2552628A
Application number: GB1715441.0A
Authority: GB
Inventors: Xu Zhaowei
Original assignee: Yueqing Onesto Electric Co Ltd
Current assignee: Yueqing Onesto Electric Co Ltd
Priority date: 2016-03-14
Filing date: 2016-08-19
Publication date: 2018-01-31
Anticipated expiration: 2036-08-19
Also published as: GB2552628B; CN105575740B; CN105575740A; DE112016001398T5; GB201715441D0; DE112016001398B4; WO2017156978A1; TN2018000230A1

Abstract

Disclosed is a breaker. The breaker comprises a casing (1), a drive wheel (2), a tripping frame (3), a handle (4), a connecting rod (5), a moving contact (6), a first elastic return member (8), a second elastic return member (9), and an electromagnetic tripper (10). The electromagnetic tripper comprises a stationary contact (7). The handle is rotatably mounted in the casing, and the connecting rod is connected to the handle at one end and contacts and mates with the drive wheel and the tripping frame at the other end. The first elastic return member is connected to the casing at one end and to the drive wheel at the other end. The second elastic return member is connected to the drive wheel at one end and to the tripping frame at the other end. The drive wheel comprises a drive wheel body, and a first rotation shaft and a second rotation shaft disposed on the drive wheel body. The drive wheel is rotatably mounted in the casing by means of the first rotation shaft, and the tripping frame is rotatably provided on the drive wheel by means of the second rotation shaft. The moving contact and the stationary contact are disposed opposite to each other. The moving contact is mounted on the drive wheel. Upon rotating, the drive wheel drives the moving contact to rotate such that the moving contact contacts with or separates from the stationary contact. The breaker of the present invention has a simple structure and low cost, and is convenient to assemble.

Description

(56) Documents Cited:

EP 1143477 B1 CN 204991626 U CN 105575740 A

CN 205595292 U CN 204966422 U (58) Field of Search:

INT CL H01H

Other: CNABS, CNTXT, CNKI, DWPI (87) International Publication Data:

WO2017/156978 Zh 21.09.2017 (71) Applicant(s):

Yueqing Onesto Electric Co., Ltd.

No.60 Shahong Road, Wanglin village,

North Baixiang, Yueqing 325603, Zhejiang, China (72) Inventor(s):

Zhaowei Xu (74) Agent and/or Address for Service:

Albright IP Limited

County House, Bayshill Road, CHELTENHAM, Gloucestershire, GL50 3BA, United Kingdom (54) Title of the Invention: Breaker Abstract Title: Breaker (57) Disclosed is a breaker. The breaker comprises a casing (1), a drive wheel (2), a tripping frame (3), a handle (4), a connecting rod (5), a moving contact (6), a first elastic return member (8), a second elastic return member (9), and an electromagnetic tripper (10). The electromagnetic tripper comprises a stationary contact (7). The handle is rotatably mounted in the casing, and the connecting rod is connected to the handle at one end and contacts and mates with the drive wheel and the tripping frame at the other end. The first elastic return member is connected to the casing at one end and to the drive wheel at the other end. The second elastic return member is connected to the drive wheel at one end and to the tripping frame at the other end. The drive wheel comprises a drive wheel body, and a first rotation shaft and a second rotation shaft disposed on the drive wheel body. The drive wheel is rotatably mounted in the casing by means of the first rotation shaft, and the tripping frame is rotatably provided on the drive wheel by means of the second rotation shaft. The moving contact and the stationary contact are disposed opposite to each other. The moving contact is mounted on the drive wheel. Upon rotating, the drive wheel drives the moving contact to rotate such that the moving contact contacts with or separates from the stationary contact. The breaker of the present invention has a simple structure and low cost, and is convenient to assemble.

This application has entered the national phase early

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BREAKER

TECHNOLOGY FIELD

This invention relates to a technical field of low-voltage electrical appliance protection and, more particularly, to a breaker.

BACKGROUND ART

A breaker is a switching device which can close, carry, and interrupt a current flow under a normal circuit condition and carry and interrupt the current flow under an abnormal circuit condition within a stipulated time. The breaker in the prior art generally comprises a shell, a handle, a connecting rod, a fixed contact, a moving contact, a contact supporter, a jump pin, a latch, a lever, a latch spring, a contact spring, a resetting spring, a magnetic trip, a thermal trip, and an arc extinguish, etc. The conventional breaker has a complex structure, which is hard to assembly and costs a lot.

SUMMARY OF THE INVENTION

To solve the above technical problem of the prior art, this invention provides a breaker with a simple structure, easy assembling, and low cost.

To achieve the purpose above, this invention provides a breaker, comprising: a shell, a driving wheel, a tripping frame, a handle, a connecting rod, a moving contact, a first elastic resetting element, a second elastic resetting element, and a magnetic trip; the magnetic trip includes a fixed contact. The handle is rotatablely installed in the shell, one end of the connecting rod is connected with the handle, and the other end contacts and cooperates with the driving wheel and the tripping frame to drive the driving wheel and the tripping frame to rotate. One end of the first elastic resetting element is connected with the shell, and the other end is connected with the driving wheel; one end of the second elastic resetting element is connected with the driving wheel, and the other end is connected with the tripping frame. The driving wheel includes a driving wheel main body, a first rotation shaft, and a second rotation shaft. The first rotation shaft and the second rotation shaft are disposed at the driving wheel main body, the driving wheel is rotatablely installed in the shell by the first rotation shaft, and the tripping frame is rotatablely disposed at the driving wheel by the second rotation shaft. The fixed contact is fixed in the shell, and the moving contact is disposed opposite to the fixed contact. The moving contact is installed at the driving wheel and is driven to rotate to contact or be separated from the fixed contact when the driving wheel is rotating.

In an embodiment of the invention, the tripping frame includes a first frame part, a hook part, and a locking part. The first frame part is rotatablely disposed at the driving wheel by the second rotation shaft, the hook part is disposed at one side of the first frame part and bends towards the first frame part, and the locking part is disposed at the hook part and protrudes towards the first frame part. A first bayonet is formed among the first frame part, the hook part, and the locking part; a second bayonet is disposed at the driving wheel main body; the first bayonet and the second bayonet constitute a groove, and one end of the connecting rod is inserted into the groove constituted by the first bayonet and the second bayonet.

In an embodiment of the invention, the first frame part includes a second part, a third part, and a fourth part. One end of the third part is connected with the hook part and the second part, and the other end of the third part is connected with the fourth part. The hook part and the second part are located on the two sides of the third part, respectively. The second part and the fourth part are located on the same side of the third part, and the hook part bends towards the third part, a first axle hole is disposed at the second part. One end of the second rotation shaft is inserted into the first axle hole, and one end of the third part which is connected with the fourth part is connected with the second elastic resetting element.

In an embodiment of the invention, the tripping frame further includes a second frame part, the second frame part is connected with the hook part and the first frame part, and the driving wheel is disposed between the first frame part and the second frame part; the second frame part includes a fifth part, a sixth part, a seventh part, an eighth part, and a ninth part; one end of the seventh part is connected with the fifth part and the sixth part, the other end of the seventh part is connected with the fourth part and the ninth part, the other end of the ninth part is connected with an end of the fifth part far away from the sixth part; the fifth part is disposed opposite to the hook part, the fifth part is connected with a side surface of the hook part, the sixth part is disposed opposite to the second part, a second axle hole is disposed at the sixth part, the other end of the second rotation shaft is inserted into the second axle hole, the seventh part is disposed opposite to the third part, the eighth part is disposed opposite to the fourth part, and a free end of the eighth part is connected with a free end of the fourth part.

In an embodiment of the invention, the driving wheel further includes a limiting part, and the limiting part is disposed at the driving wheel main body to limit a rotation angle of the tripping frame relative to the driving wheel.

In an embodiment of the invention, the breaker further includes a limiting elastic element, a containing groove is disposed at the driving wheel main body, one end of the moving contact is rotatablely disposed in the containing groove, and two ends of the limiting elastic element are connected with the moving contact and the driving wheel main body, respectively.

In an embodiment of the invention, the driving wheel main body further includes a first connection end and a second connection end, and the first connection end and the second connection end are disposed on the two sides of the containing groove, respectively. The first connection end is connected with the first elastic resetting element, and the second connection end is connected with the second elastic resetting element.

In an embodiment of the invention, the breaker further includes a thermal trip, and the thermal trip includes a bimetallic strip, a bimetallic support, and a tripping rod. The bimetallic strip is installed in the shell by the bimetallic support, and the tripping rod is connected with the bimetallic strip and the tripping frame.

In an embodiment of the invention, the magnetic trip further includes a skeleton, a coil, a moving iron core, a mandril, and an iron core spring. The coil is sleeved outside the skeleton, and the moving iron core is disposed inside the skeleton. The fixed contact includes a fixed segment, a protruding segment, a contact segment, and an arc striking segment. The fixed segment is disposed at one end of the skeleton, and the contact segment is connected with the fixed segment, the arc striking segment is connected with the contact segment. The protruding segment protrudes towards the moving iron core from the fixed segment, and the iron core spring is against between the moving iron core and the protruding segment. One end of the mandril is connected with the moving iron core, and the other end passes through the protruding segment and is directed towards the tripping frame.

In an embodiment of the invention, the breaker further includes an arc extinguish chamber, and the arc extinguish chamber is disposed on one side of the fixed contact. The arc extinguish chamber includes a fixed plate and a plurality of arc extinguishing pieces, and the fixed plate includes a base plate, a first side plate, and a second side plate. The first side plate and the second side plate are disposed on two sides of the base plate, respectively. The plurality of arc extinguishing pieces is disposed between the first side plate and the second side plate side by side, the two sides of any one of the arc extinguishing pieces are fixed on the first side plate and the second side plate, respectively. Intervals are formed between neighboring arc extinguishing pieces, a plurality of first gas vents are disposed at the first side plate, and the first gas vents are communicated with the intervals; a plurality of second gas vents are disposed at the second side plate, and the second gas vents are communicated with the intervals; the first gas vents and the second gas vents are disposed relatively staggered, and the first gas vents and the second gas vents are communicated with different intervals, respectively.

Compared with the prior art, the beneficial effects of this technical solution lie in: the breaker in the invention utilizes the rotating of the handle to drive the connecting rod and in further drive the driving wheel and the tripping frame to rotate, which makes the moving contact and the fixed contact contacted or separated, and the structure is simple. The driving wheel and the tripping frame achieve the functions of multiple components such as a jump pin, a latch, a lever, and a contact support in the prior art, which simplifies the structure, makes the assembly convenient, greatly improves the assembly efficiency and lowers the costs.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. lisa structural schematic diagram when a moving contact is separated from a fixed contact of a breaker in the invention;

FIG. 2 is a partial enlarged diagram of the mark B in FIG. 1;

FIG. 3 is a structural schematic diagram when the moving contact contacts the fixed contact of the breaker in the invention;

FIG. 4 is a section view of FIG. 1;

FIG. 5 is an assembled structural schematic diagram of a driving wheel, a tripping frame, a handle, a connecting rod, a moving contact, a first elastic resetting element, a second elastic resetting element, and a limiting elastic element of the breaker in the invention;

FIG. 6 is an exploded structural schematic diagram of FIG. 5;

FIG.7 is a front view of FIG. 5;

FIG. 8 is a back view of FIG. 5;

FIG. 9 is a stereostructural schematic diagram of the tripping frame of the breaker in the invention;

FIG. 10 is a structural schematic diagram of a magnetic trip in the invention;

FIG. 11 is a section view of FIG. 10;

FIG. 12 is a stereostructural schematic diagram of an arc extinguish chamber of the breaker in the invention; and

FIG. 13 is a stereostructural schematic diagram of the arc extinguish chamber of the breaker in the invention from another angle.

DETAIFED DESCRIPTION OF THE INVENTION

With reference to the accompanied drawings, the technical solution of the invention is described clearly and completely through specific embodiments.

As shown in FIGs. 1-4, the invention provides a breaker, comprising: a shell 1, a driving wheel 2, a tripping frame 3, a handle 4, a connecting rod 5, a moving contact 6, a first elastic resetting element 8, a second elastic resetting element 9, and a magnetic trip 50. The magnetic trip 50 includes a fixed contact 7.

To facilitate illustration, the positions of the driving wheel 2, the tripping frame 3, the handle 4, the connecting rod 5, the moving contact 6, and the first elastic resetting element 8 in the breaker of FIG.1 are defined as home positions. “Left”, “right”, “above”, and “below” in this application are the left, right, above, and below for the corresponding figures, respectively, which is only for the convenience of illustrating the working principle of the breaker in detail, but not to limit the invention.

The handle 4 is rotatablely installed in the shell 1, and a torsional spring is disposed at the rotation center of the handle 4. The counterforce of the torsional spring can reset the handle 4 to the home position automatically after the handle 4 is rotated. One end of the connecting rod 5 is connected with the handle 4, the other end contacts and cooperates with the driving wheel 2 and the tripping frame 3 to drive the driving wheel 2 and the tripping frame 3 to rotate. Contacting and cooperating means, when connecting with the driving wheel 2 and the tripping frame 3, the rotating rod 5 can drive the driving wheel 2 and the tripping frame 3 to rotate. The side surface of the rotating rod 5 connecting with the driving wheel 2 and the tripping frame 3 is an arc-shaped surface.

One end of the first elastic resetting element 8 is connected with the shell 1, and the other end is connected with the driving wheel 2. When the driving wheel 2 rotates clockwise and compresses the first elastic resetting element 8, the counterforce generated by the first elastic resetting element 8 has a trend to return to the home position anticlockwise. In an embodiment, the first elastic resetting element 8 is a compression spring, but not limited to that. The first elastic resetting element 8 also can be elastic element of other types. When the first elastic resetting element 8 is compressed to save enough elastic potential energy, it has a large counterforce when released. The first elastic resetting element 8 bends to arc-shape, so the first elastic resetting element 8 releases the elastic potential energy more quickly which can avoid the second arcing caused by the shaking of the moving contact 6. One end of the second elastic resetting element 9 is connected with the driving wheel 2, and the other end is connected with the tripping frame 3. Thus the tripping frame 3 rotates around the driving wheel 2 clockwise until the limiting part 23 of the driving wheel 2 stops the tripping force 3. The second elastic resetting element 9 is a compression spring, but not limited to that. The second elastic resetting element 9 also can be elastic element of other types. When the driving wheel 2 rotates relative to the tripping frame 3 and compresses the second elastic resetting element 9, the counterforce generated by the first elastic resetting element 8 makes the tripping frame 3 rotate around the driving wheel 2 clockwise until the limiting part 23 of the driving wheel 2 stops the tripping force 3. Clockwise refers to the direction pointed by A of FIG. 1 and FIG. 7, anticlockwise refers to the opposite direction, the same below.

The driving wheel 2 includes a driving wheel main body 20, a first rotation shaft 21, and a second rotation shaft 22. The first rotation shaft 21 and second rotation shaft 22 are disposed at the driving wheel main body 20. The driving wheel 2 is rotatablely disposed at the shell 1 by the first rotation shaft 21, and the tripping frame 3 is rotatablely disposed outside the driving wheel 2 by the second rotation shaft 22. The fixed contact 7 is fixedly disposed at the shell 1, and the moving contact 6 is disposed opposite to the fixed contact 7. The moving contact 6 is disposed at the driving wheel 2, and is driven to rotate to contact or be separated from the fixed contact 7 when the driving wheel 2 is rotating.

When the handle 4 rotates clockwise to drive the connecting rod 5 to move, as the connecting rod 5 contacts and cooperates with the driving wheel 2 and the tripping frame 3 to drive the driving wheel 2 and the tripping frame 3 to rotate and in further drive the moving contact 6 to rotate, the moving contact 6 connect with or separate from the fixed contact 7. The driving wheel 2 and the tripping frame 3 achieve the functions of multiply components in the prior art including a jump pin, a latch, a lever, and a contact spring, etc.. The assembly is very convenient, the assembly efficiency is greatly improved, and the cost is reduced.

The tripping frame 3 includes a first frame part 31, a hook part 311 and a locking part 33. The first frame part 31 is rotatablely disposed at the driving wheel 2 by the second rotation shaft 22, the hook part 311 is disposed at one side of the first frame part 31 and bends towards the first frame part 31, and the locking part 33 is disposed at the hook part 311 and protrudes towards the first frame part 31. A first bayonet 301 is formed by the first frame part 31, the hook part 311, and the locking part 33. The second bayonet 202 is disposed at the driving wheel main body 20. The first bayonet 301 and the second bayonet 202 constitute a groove, and one end of the connecting rod 5 is inserted into the groove constituted by the first bayonet 301 and the second bayonet 202. The end of the connecting rod 5 can move in the space circled by the first bayonet 301 and the second bayonet 202. When the handle 4 rotates clockwise, the end of the connecting rod 5 moves to right in the space circled by the first bayonet 301 and the second bayonet 202, and the locking part 33 locks the connecting rod 5 to prevent the connecting rod 5 from splitting out of the second bayonet 202.

When the breaker is in the state shown in FIG. 3, the counterforce of the first elastic resetting element 8 transmits to the lower position of the rotating center of the handle 4 through the driving wheel 2 and the connecting rod 5, which is the force that drives the handle 4 to rotate clockwise. The force rotating clockwise is larger than the anticlockwise restoring force that the torsional spring brings to the handle 4, however, the handle 4 cannot rotate clockwise since it is stopped by the shell 1. At this point, one end of the connecting rod 5 abuts the side wall of the locking part 33 and the inner wall of the second bayonet 202, the locking part 33 stops the opening of the second bayonet 202 to prevent the end of the connecting rod 5 moving out of the opening of the second bayonet 202, and the locking part 33 has the effect of locking the connecting rod 5. If a force that can drive the tripping frame 3 to rotate anticlockwise is applied on the tripping frame right now, the locking effect of the locking part 33 is destroyed, and an opening is formed in the locking part 33 and the second bayonet 202. The end of the rotating rod 5 splits out of the opening. At this point, the counterforce generated by the second elastic resetting element 9 makes the tripping frame 3 rotate around the driving wheel 2 clockwise until the limiting part 23 of the driving wheel 2 stops the tripping frame 3. At this time the counterforce that compressing the first elastic resetting element 8 makes the driving wheel 2 and the tripping frame 3 rotate anticlockwise until the driving wheel 2 contacts the limiting part 101 of the shell 1, the moving contact 6 rotates anticlockwise with the driving wheel 2 and separates from the fixed contact 7. At this point, one end of the connecting rod 5 has split out of the opening, the force acted on the handle 4 transmitted by the first elastic resetting element 8 through the driving wheel 2 and the connecting rod 5 has disappeared. At this time the force that drives the handle 4 to move is the anticlockwise restoring force applied on the handle 4 by the torsional spring, the handle 4 rotates anticlockwise to drive the connecting rod 5 to return to the home position, that is the state shown in FIG. 1.

As shown in FIG. 1, the handle 4 is in the home position. At this point, rotating the handle 4 clockwise, one end of the connecting rod 5 moves right in the second bayonet 202. When the end of the connecting rod 5 contacts the inner wall of the second bayonet 202, the connecting rod 5 drives the driving wheel 2 to rotate. If the second elastic resetting element 9 is compressed then, the contrary force generated by the second elastic resetting element 9 drives the tripping frame 3 to move clockwise, in addition, when one end of the connecting rod 5 contacts the inner wall of the second bayonet 202, the end of the connecting rod 5 contacts the locking part 33 simultaneously. The connecting rod 5 drives the driving wheel 2 and the locking part 33 at the same time. As the combined effect of the second elastic resetting element 9 and the locking part 33, the tripping frame 3 rotates clockwise along with the driving wheel 2, the moving contact 6 rotates clockwise together. When a certain angle is reached, the moving contact 6 contacts the fixed contact 7, and the circuit is connected.

The breaker further includes a limiting elastic element 10. A containing groove 201 is disposed at the driving wheel main body 20, one end of the moving contact 6 is rotatablely disposed at the containing groove 201, and two ends of the limiting elastic element 10 are respectively connected with the moving contact 6 and the driving wheel main body 20. The driving wheel 2 compresses the limiting elastic element 10 when rotating relative to the moving contact 6 to drive the moving contact 6 to contact the fixed contact 7 reliably. In an embodiment, the limiting elastic element 10 is a compression spring. As shown in FIG. 1 and FIG. 3, as the handle 4 is rotated clockwise, when the fixed contact 6 is newly connected with the fixed contact 7, the cables in two sides of the connecting rod 5 is in the above of the rotating center of the handle 4. If the force applied on the handle 4 is removed at this point, as both the restoring force of the torsional spring and the counterforce of the first elastic resetting element 8 are the force that drive the handle 4 to rotate anticlockwise, the handle 4 is rotated anticlockwise to the home position. The driving wheel 2 and the tripping frame 3 return to the home position as well, and the moving contact 6 will be separated from the fixed contact 7. Therefore when the fixed contact 6 is newly connected with the fixed contact 7, the handle 4 needs to be rotated continually, thus the driving force 6 cannot be rotated continually as abutting on the fixed contact 7, while the driving wheel 2 and the tripping frame 3 are rotated continually. Hence, the driving wheel 2 is rotated clockwise relative to the moving contact 6, and the limiting elastic element 10 is compressed. When the handle 4 is rotated to abut on the limiting part 102 of the shell 1, which is the position shown in FIG. 3, the cables in two sides of the connecting rod 5 is in the lower position of the rotating center of the handle. At this point, as the counterforce of both the limiting elastic element 10 and the first elastic resetting element 8 are the force that drive the handle 4 to rotate clockwise, which is larger than the restoring force of the torsional spring, the handle 4 cannot return to the home position automatically if the force applied on the handle 4 is removed at this point. At this time, the moving contact 6 abuts on the fixed contact tightly, that is the moving contact 6 contacts the fixed contact 7 reliably. The circuit is connected reliably at this time, namely the state shown in FIG. 3.

As shown in FIGs. 1-4, the driving wheel 20 includes a first connecting end 211 and a second connecting end 212. The first connecting end 211 and the second connecting end 212 are disposed at two sides of the containing groove 201, respectively. The first connecting end 211 is connected with the first elastic resetting element 8, and the second connecting end 212 is connected with the second elastic resetting element 9.

The driving wheel 2 further includes a limiting part 23, and the limiting part 23 is disposed at the driving wheel main body 20 to limit the rotating angle of the tripping frame 3 around the driving wheel 2 in order to facilitate installing the connecting rod 5. In detail, the limiting part 23 is disposed at one side of the first rotation shaft 21, and after the tripping frame 3 is assembled to the driving wheel 2, the second elastic resetting element 9 is assembled between the driving wheel 2 and the tripping frame 3. Under the force of the second elastic resetting element 9, the tripping frame 3 is rotated clockwise relative to the driving wheel 2 until the tripping frame 3 is against the limiting part 23 and stops rotating. At this moment, the first bayonet 301 and the second bayonet 202 constitute a groove, which is convenient for one end of the connecting rod 5 to insert into the groove constituted by the first bayonet 301 and the second bayonet 202 in order, thereby facilitating the installation of the connecting rod 5.

As shown in FIGs. 5-9, the first frame part 31 includes a second part 312, a third part 313, and a fourth part 314, one end of the third part 313 is connected with the hook part 311 and the second part 312, the other end of the third part 313 is connected with the fourth part 314, the hook part 311 and the second part 312 is located on the two side of the third part 313 respectively, the second part 312 and the fourth part 314 are located on the same side of the third part 313, the hook part 311 bends towards the third part 313. The first frame part 31 and the hook part 311 are connected as a patch, which has a simple structure and is easy to machine, the structure of the breaker is simplified and the cost is reduced. A first axle hole 3120 is disposed in the second part 312, one end of the second rotation shaft 22 is inserted into the first axle hole 3120, thus the tripping frame 3 can be rotated around the center of the second rotation shaft 22. The third part 313 and one connecting end of the fourth part 314 are connected with the second elastic resetting element 9. A free end of the fourth part 314 lies towards to the magnetic trip 50, the free end of the fourth part 314 refers to the end far away from the third part 313 of the fourth part 314. The dash lines in FIG. 7 are only for distinguishing the hook part 311 and each part of the first frame part 31 to illustrate the structure of the hook part 311 and the first frame part 31, while no dash line exists in actual products.

As shown in FIGs. 5-9, to ensure the stability of the structure, the tripping frame 3 further includes a second frame part 32, the second frame part 32 is connected with the hook part 311 and the first frame part 31, and the driving wheel 2 is disposed between the first frame part 31 and the second frame part 32. The second frame part 32 includes a fifth part 321, a sixth part 322, a seventh part 323, an eighth part 324, and a ninth part 325. One end of the seventh part 323 is connected with the fifth part 321 and the sixth part 322, the other end of the seventh part 323 is connected with the fourth part 314 and the ninth part 325, the other part of the ninth part 325 is connected with one end of the fifth part 321 far away from the sixth part 322. In other words, the fifth part 321, the seventh part 323, and the ninth part 325 form a circle, such that the structure strength is better, and the materials are saved. The fifth part 321 is disposed opposite to the hook part 311, the fifth part 321 is connected with a side surface of the hook part 311 to enhance the structure strength of the tripping frame 3, and the locking part 33 is disposed at the connection of the hook part 311 and the fifth part 321. The second bayonet 202 faces toward the inner side of the side surface of the connection between the fifth part 321 and the hook part 311 to prevent one end of the connection rod 5 from slipping off the second bayonet 202. The sixth part 322 is disposed opposite to the second part 312, a second axle hole 3122 is disposed at the sixth part 322, and the other end of the second rotation shaft 22 is inserted into the second axle hole 3122. Thus the first frame part 31 and the second frame part 32 can rotate together around the second rotation shaft 22 together. The seventh part 323 is disposed opposite to the third part 313, the eighth part 324 is disposed opposite to the fourth part 314, and a free end of the eighth part 324 is connected with the free end of the fourth part 314 to enhance the structure strength of the tripping frame 3. The free end of the eighth part 324 refers to the end of the eighth part 324 far away from the seventh part 323. The dash lines in FIG. 8 are only for distinguishing each part of the second frame part 32 to illustrate the structure of the second frame part 32, while no dash line exists in actual products.

The breaker further includes a thermal trip 40, and the thermal trip 40 includes a bimetallic strip 41, a bimetallic support 43, an arc striking piece 44, and a tripping rod 42. The tripping rod 42 is connected with the bimetallic strip 41 and the tripping frame 3. In detail, a groove is disposed in the eighth part 324, one end of the tripping rod 42 is inserted into the groove to connect the tripping frame 3. The bimetallic strip 41 is installed in the shell 1 by the bimetallic support 43. One end of the arc striking piece 44 is connected with the bimetallic support 43, and the other end is disposed at one side of an arc extinguish chamber 80 to guide the arc to the arc extinguish chamber 80 for extinction. The bending direction of the bimetallic strip 41 of the thermal trip 40 after heating is far away from the tripping frame 3, and when the breaker is overloaded, the bimetallic strip 41 is heated to bend, which drives the tripping rod 42 to move right. Thus, the tripping rod 42 drives the tripping frame 3 to rotate anticlockwise, and the locking effect of the end of the connecting rod 5 close to the locking part 33 is destroyed. The first elastic resetting element 8 releases the elastic potential energy, which drives the driving wheel 2, the tripping frame 3 and the handle 4 to rotate anticlockwise fast, thereby separating the moving contact 6 from the fixed contact 7 and disconnecting the circuit.

As shown in FIG. 4, FIG. 10 and FIG. 11, the magnetic trip 50 further includes a skeleton 51, a coil 52, a moving iron core 53, a mandril 54, and an iron core spring 55. The fixed contact 7 is disposed at one end of the skeleton 51. The coil 52 is disposed outside of the skeleton 51, and the moving iron core 53 is disposed inside the skeleton 51. The fixed contact 7 includes a fixed segment 71, a protruding segment 72, and a contact segment 73. The fixed segment 71 is disposed at one end of the skeleton 51, the contact segment 73 is connected with the fixed segment 71, and the protruding segment 72 protrudes to the moving iron core 53 from the fixed segment 71. The iron core spring 55 is hold between the moving iron core 53 and the fixed contact 7. In detail, the iron core spring 55 is hold between the moving iron core 53 and the protruding segment 72. One end of the mandril 54 is connected with the moving iron core 53, and the other end passes through the protruding segment 72. When the moving contact 6 contacts the fixed contact 7, the mandril 54 approaches the free end of the fourth part 314. When the circuit is shorted, the current increases sharply, the moving iron core 53 and the protruding segment 72 of the fixed contact 7 attract each other under the electromagnetism of the coil 52, the moving iron core 53 moves towards the direction of the fixed contact 7 fast, and the moving iron core 53 pushes the mandril 54 to the fourth part 314 of the tripping frame 3. Thus, the tripping frame 3 is driven to rotate anticlockwise around the second rotation shaft 22, and the locking effect of one end of the connecting rod 5 close to the locking part 33 is destroyed. An opening is formed at the locking part 33 and the second bayonet 202, one end of the connecting rod 5 slides out of the opening, and the first elastic resetting element 8 releases the elastic potential energy, which drives the driving wheel 2, the tripping frame 3 and the handle 4 to rotate anticlockwise instantly, such that the moving contact 6 is separated from the fixed contact 7 quickly and the circuit is disconnected to protect the circuit. The fixed segment 71 of the fixed contact 7 has the effect of a magnet yoke in the prior art, the protruding segment 72 has the effect of a fixed iron core in the prior art, and the contact segment 73 has the effect of a fixed contact in the prior art. In other words, the fixed contact 7 in the invention plays the roles of the magnet yoke, the fixed iron core and the fixed contact in the prior art. Multiple components are replaced with only one component, which decreases the number of the components of the breaker. Thus, the structure is simple, the assembling is easy, the performance is steady, and the cost is reduced.

A through-hole 702 is disclosed at the protruding segment 72, and the mandril 54 passes through the through-hole 702, so that the mandril 54 can pass through the through-hole 702 to move thus to push the tripping frame 3 to rotate anticlockwise. Thus, the mechanism is moved to separate the moving contact from the fixed contact.

The contact segment 73 further includes a fixed touch rod 731 and a contactor 732, the fixed touch rod 731 is connected with the fixed segment 71, and the contactor 732 is disposed on the fixed touch rod 731. In detail, the touch rod 731 is of a circle. The contactor 732 is fixed to the fixed touch rod 731 by welding or riveting. When the fixed contact 7 contacts the moving contact 6, the moving contact 6 is contacted by the contactor 732.

The fixed contactor 7 further includes an arc striking segment 74, and the arc striking segment 74 is connected with the contact segment 73. More detailedly, the arc striking segment 74 is connected with the fixed touch rod 731. The arc striking segment 74 is installed at one side of the arc extinguish chamber 80 during assembling to facilitate the arc striking segment 74 to strike the arc into the arc extinguish chamber 80 to reduce the energy of the arc and achieve the eifect of fast arc extinguishing. The fixed segment 71, the protruding segment 72, the fixed touch rod 731, and the striking segment 74 are integrally formed. Thus, the structure is simplified and the cost is reduced, and the performance is more steady without installing by riveting or welding, etc.

As shown in FIG. 1, FIG. 12, and FIG 13, the breaker further includes an arc extinguish chamber 80. The arc extinguish chamber 80 is installed inside the shell 1 and disposed on one side of the fixed contact 7. In detail, the arc extinguish chamber 80 is disposed between the arc striking segment 74 of the fixed contact 7 and the arc striking piece 44 of the thermal trip 40. The arc extinguish chamber 80 includes a fixed plate 81 and a plurality of arc extinguishing pieces 82. The fixed plate 81 includes a base plate 810, a first side plate 811, and a second side plate 812. The first side plate 811 and the second side plate 812 are disposed on the two sides of the base plate 810, respectively, several arc extinguishing pieces 82 are disposed between the first side plate 811 and the second side plate 812 side by side, and intervals are formed between neighboring arc extinguishing pieces 82. Several first gas vents 801 are disposed at the first side plate 811, the first gas vents 801 are communicated with the intervals; several second gas vents 802 are disposed at the second side plate 812, the second gas vents 802 are communicated with the intervals. Several third gas vents 803 are disposed at the base plate 810. The breaker works after a short-circuit current occurs, the arc generated after the moving contact 6 is separated from the fixed contact 7 enters into the arc extinguish chamber 80 through the arc striking segment 74 of the fixed contact 7 and the arc striking piece 44 of the thermal trip 40, the first gas vents 801, the second gas vents 802 and the third gas vents 803 rapidly guide the arc to shunt the current, which prevents the arc from surging up to the middle of the arc extinguish chamber 80 simultaneously, avoids breakdown or bum of the arc extinguishing pieces 82, and prevents the external airflow to enter the intervals. After the arc is cut by the arc extinguishing pieces 82, the generated charged ions move quickly through the first gas vents 801, the second gas vents 802 and the third gas vents 803 and are expelled from the arc extinguish chamber 80, and then the charged ions are compressed by the fixed plate 81 and are expelled from the fixed plate 81 after removing an impact force, which avoids the charged ions to be expelled from the fixed plate 81 directly causing harm to the metal conductor.

The first gas vents 801 and the second gas vents 802 are disposed relatively staggered, and the first gas vents 801 and the second gas vents 802 are communicated with different intervals, respectively. In other words, the intervals communicated with the first gas vents 801 and the intervals communicated with the second gas vents 802 are disposed across, which facilitates the arc to be expelled from the first gas vents 801 and the second gas vents 802 fast. The first gas vents 801 are square holes or round holes, which are simple in structure and easy to process. Similarly, the second gas vents 802 are square holes or round holes, which are also easy to process.

The third gas vents 803 are square holes or round holes, the third gas vents 803 are arranged in two rows, and the two rows of the third gas vent 803 are disposed staggerly to be communicated with different intervals. The structure is simple, and the process is easy.

In conclusion, the breaker in the invention utilizes the handle to push the connecting rod and then drive the driving wheel and the tripping frame to rotate to make the moving contact contact or be separated from the fixed contact. The structure is simple, and the driving wheel and the tripping frame achieve the functions of multiple components such as a jump pin, a latch, a lever, and a contact support in the prior art, which simplifies the structure, makes the assembly convenient, greatly improves the assembly efficiency and lowers the costs.

Although the invention is described in considerable detail with reference to certain preferred embodiments thereof, the disclosure is not for limiting the scope of the invention. Persons having ordinary skill in the art may make various modifications and changes without departing from the scope and spirit of the invention. Therefore, the scope of the appended claims should not be limited to the description of the preferred embodiments described above.

Claims

CLAIMS What is claimed is:

1. A breaker, comprising:

a shell, a driving wheel, a tripping frame, a handle, a connecting rod, a moving contact, a first elastic resetting element, a second elastic resetting element, and a magnetic trip; wherein the magnetic trip comprises a fixed contact;

wherein the handle is rotatablely installed in the shell, one end of the connecting rod is connected with the handle, the other end contacts and cooperates with the driving wheel and the tripping frame to drive the driving wheel and the tripping frame to rotate;

one end of the first elastic resetting element is connected with the shell, and the other end is connected with the driving wheel; one end of the second elastic resetting element is connected with the driving wheel, and the other end is connected with the tripping frame;

wherein the driving wheel comprises a driving wheel main body, a first rotation shaft, and a second rotation shaft, the first rotation shaft and the second rotation shaft are disposed at the driving wheel main body, the driving wheel is rotatablely installed in the shell by the first rotation shaft, and the tripping frame is rotatablely disposed at the driving wheel by the second rotation shaft; and wherein the fixed contact is disposed in the shell, the moving contact is disposed opposite to the fixed contact, the moving contact is installed at the driving wheel, and the moving contact is driven to rotate to contact or be separated from the fixed contact when the driving wheel is rotating.

2. The breaker according to claim 1, wherein the tripping frame comprises a first frame part, a hook part, and a locking part, the first frame part is rotatablely disposed at the driving wheel by the second rotation shaft, the hook part is disposed at one side of the first frame part and bends towards the first frame part, the locking part is disposed at the hook part and protrudes towards the first frame part, and a first bayonet is formed among the first frame part, the hook part, and the locking part; a second bayonet is disposed at the driving wheel main body; the first bayonet and the second bayonet constitute a groove, and one end of the connecting rod is inserted into the groove constituted by the first bayonet and the second bayonet.

3. The breaker according to claim 2, wherein the first frame part comprises a second part, a third part, and a fourth part, one end of the third part is connected with the hook part and the second part, the other end of the third part is connected with the fourth part, the hook part and the second part are located on two sides of the third part, respectively, the second part and the fourth part are located on one same side of the third part, the hook part bends towards the third part, a first axle hole is disposed at the second part, one end of the second rotation shaft is inserted into the first axle hole, and one end of the third part connected with the fourth part is connected with the second elastic resetting element.

4. The breaker according to claim 3, wherein the tripping frame further comprises a second frame part, the second frame part is connected with the hook part and the first frame part, and the driving wheel is disposed between the first frame part and the second frame part; the second frame part comprises a fifth part, a sixth part, a seventh part, a eighth part, and a ninth part; one end of the seventh part is connected with the fifth part and the sixth part, the other end of the seventh part is connected with the fourth part and the ninth part, and the other end of the ninth part is connected with an end of the fifth part far away from the sixth part; the fifth part is disposed opposite to the hook part, the fifth part is connected with a side surface of the hook part, the sixth part is disposed opposite to the second part, a second axle hole is disposed at the sixth part, the other end of the second rotation shaft is inserted into the second axle hole, the seventh part is disposed opposite to the third part, the eighth part is disposed opposite to the fourth part, and a free end of the eighth part is connected with a free end of the fourth part.

5. The breaker according to claim 1, wherein the driving wheel further comprises a limiting part, and the limiting part is disposed at the driving wheel main body to limit a rotation angle of the tripping frame relative to the driving wheel.

6. The breaker according to claim 1, wherein the breaker further comprises a limiting elastic element, a containing groove is disposed at the driving wheel main body, and one end of the moving contact is rotatablely disposed in the containing groove, two ends of the limiting elastic element are connected with the moving contact and the driving wheel main body, respectively.

7. The breaker according to claim 6, wherein the driving wheel main body further comprises a first connection end and a second connection end, the first connection end and the second connection end are disposed on two sides of the containing groove, respectively, the first connection end is connected with the first elastic resetting element, and the second connection end is connected with the second elastic resetting element.

8. The breaker according to claim 1, wherein the breaker further comprises a thermal trip, the thermal trip comprises a bimetallic strip, a bimetallic support, and a tripping rod, the bimetallic strip is installed in the shell by the bimetallic support, and the tripping rod is connected with the bimetallic strip and the tripping frame.

9. The breaker according to claim 1, wherein the magnetic trip further comprises a skeleton, a coil, a moving iron core, a mandril, and an iron core spring, the coil is sleeved outside of the skeleton, and the moving iron core is disposed inside the skeleton, the fixed contact comprises a fixed segment, a protruding segment, a contact segment, and an arc striking segment, the fixed segment is disposed at one end of the skeleton, and the contact segment is connected with the fixed segment, the arc striking segment is connected with the contact segment, the protruding segment protrudes towards the moving iron core from the fixed segment, and the iron core spring is against between the moving iron core and the protruding segment, one end of the mandril is connected with the moving iron core, and the other end passes through the protruding segment and is directed towards the tripping frame.

10. The breaker according to claim 1, wherein the breaker further comprises an arc extinguish chamber, and the arc extinguish chamber is disposed at one end of the fixed contact, the arc extinguish chamber comprises a fixed plate and a plurality of arc extinguishing pieces, and the fixed plate comprises a base plate, a first side plate, and a second side plate, the first side plate and the second side plate are disposed on two sides of the base plate, respectively, the plurality of arc extinguishing pieces are disposed between the first side plate and the second side plate side by side, the two sides of any one of the arc extinguishing piece are fixed on the first side plate and the second side plate, respectively, intervals re formed between neighboring arc extinguishing pieces, a plurality of first gas vents are disposed at the first side plate, the first gas vents are connected with the intervals; a plurality of second gas vents are disposed at the second side plate, and the second gas vents are communicated with the intervals; the first gas vents and the second gas vents are disposed relatively staggered, and the first gas vents and the second gas vents are communicated with different intervals, respectively.