CN218274499U

CN218274499U - Quick arc extinguishing high breaking micro breaker

Info

Publication number: CN218274499U
Application number: CN202221642460.0U
Authority: CN
Inventors: 谭青松; 许可
Original assignee: Wenzhou Nagul Power Technology Co ltd
Current assignee: Wenzhou Nagul Power Technology Co ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2023-01-10
Anticipated expiration: 2032-06-28

Abstract

The utility model relates to a quick arc extinguishing high breaking miniature circuit breaker, which comprises a housin, the casing includes the working chamber, be provided with trip coil subassembly in the working chamber, tripping device, the moving contact, static contact and arc extinction mechanism, trip coil mechanism includes the yoke, the yoke includes mounting bracket and installation department, the installation department sets up in the one end that the yoke corresponds the moving contact, static contact one end is connected with the installation department upper end, the other end is buckled and is formed downwards and move contact site of contact terminal complex, arc extinction mechanism includes the arc extinguishing chamber, PTC subassembly and arc extinguishing bars subassembly, the arc extinguishing chamber includes installation cavity and arc extinguishing chamber, the lower extreme of installation department is provided with the striking piece, the striking piece includes L type connecting portion and arc portion, L type connecting portion one end is connected with the lower extreme of installation department, the contact site is pressed close to the other end is buckled, the upper end of arc portion is close to the lower extreme of contact site, the lower extreme of arc portion extends to the arc extinguishing chamber. By adopting the technical scheme, the arc extinguishing time is shortened, the breaking capacity is improved, and the contact and the PTC assembly are protected.

Description

Quick arc extinguishing high breaking micro breaker

Technical Field

The utility model relates to a low-voltage apparatus technical field especially relates to a quick arc extinguishing high branch divides disconnected miniature circuit breaker.

Background

The existing miniature circuit breaker comprises an operating system, an arc extinguishing system, a tripping mechanism, a contact system, a shell, an operating handle and the like, and a main contact of the miniature circuit breaker is manually operated or electrically switched on. After the main contact is closed, the free tripping mechanism locks the main contact at the closing position. The coil of the over-current release and the thermal element of the thermal release are connected with the main circuit in series, and the coil of the under-voltage release is connected with the power supply in parallel. When the circuit is short-circuited or seriously overloaded, the armature of the over-current release is attracted, so that the free release mechanism acts, and the main contact breaks the main circuit. When the circuit is overloaded, the thermal element of the thermal release heats up to bend the bimetallic strip and push the free tripping mechanism to act. When the circuit is under-voltage, the armature of the under-voltage release releases, and the free release mechanism also acts.

With the increasing demand of power for production and living, higher requirements are put forward on the aspects of power supply safety, reliability, intellectualization and the like. Therefore, the miniature circuit breaker has high application value, and in the opening and closing process of a circuit breaker contact, if electric arc cannot be led to an arc extinguish chamber quickly, the circuit breaker contact is easy to ablate, the sectioning capability of the circuit breaker is influenced, and the product performance is reduced.

SUMMERY OF THE UTILITY MODEL

To sum up, for overcoming prior art's is not enough, the utility model provides a quick arc extinguishing high divides disconnected miniature circuit breaker.

In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a quick arc extinguishing high breaking miniature circuit breaker, includes the casing, the casing includes the working chamber, be provided with trip coil assembly, tripping device, moving contact, static contact and arc extinguishing mechanism in the working chamber, trip coil mechanism includes yoke and trip coil assembly, the yoke is including being used for the installation trip coil assembly's mounting bracket with set up in the installation department of mounting bracket one side, the installation department sets up in the yoke and corresponds the one end of moving contact, static contact one end is connected with the installation department upper end, other end buckle downwards form with moving contact complex contact site, arc extinguishing mechanism includes arc extinguishing cover, PTC subassembly and arc extinguishing bars subassembly, the arc extinguishing cover is including being used for the installation cavity of PTC subassembly and the arc extinguishing cavity that is used for installing arc extinguishing bars subassembly, the lower extreme of installation department is provided with the run-on piece, the run-on piece includes L type connecting portion and arc run-on portion, L type connecting portion one end with the lower extreme of installation department is connected, and the other end is buckled and is pressed close to the contact site, the upper end of arc running-on portion is close to the contact site, the arc run-on of arc running-on portion is close to the lower extreme of contact site, the arc running-on of arc running portion extends to the arc running-on cavity direction.

By adopting the technical scheme, the arc striking plate is arranged between the fixed contact and the arc extinguishing chamber, the upper end of the arc striking part is close to the lower end of the contact part, the lower end of the arc striking part extends towards the direction of the arc extinguishing chamber, and the arc generated by the separation of the contact is quickly led to the arc extinguishing chamber, so that the arc extinguishing time is shortened, the breaking capacity is improved, the contact is protected, meanwhile, the arc is prevented from entering the installation chamber, and the PTC component is protected; meanwhile, due to the fact that the PTC component is adopted in the arc extinction mechanism, the resistance value of the PTC component is small, generally a few ohms to dozens of ohms, when a short-circuit large current flows, the instantaneous resistance becomes exponential, the larger the short-circuit current is, the shorter the reaction time is, the short-circuit current 50KA can be clamped below 1KA within 0.5ms, the breaking capacity is further improved, and the arc extinction mechanism is reasonable in structural design, simple in structure, easy to manufacture, reliable in performance, low in production cost and good in practicability.

The utility model discloses further set up: the upper end of the mounting portion is provided with a first mounting convex portion used for mounting a static contact, the lower end of the mounting portion is provided with a mounting concave portion used for mounting an arc striking sheet, a mounting through hole matched with the first mounting convex portion is formed in the position, corresponding to the first mounting convex portion, of the static contact, a second mounting convex portion matched with the second mounting convex portion is formed in the position, corresponding to the mounting concave portion, of the arc striking sheet, and a bearing portion used for limiting the L-shaped connecting portion is arranged below one end, corresponding to the L-shaped connecting portion and the mounting portion, of the shell.

Through adopting above-mentioned technical scheme, make three's connection more stable, difficult skew plays the positioning action simultaneously, convenient quick installation.

The utility model discloses further set up: the arc extinguishing mechanism comprises an arc extinguishing cover, a PTC assembly and an arc extinguishing grid assembly, the auxiliary switch comprises a conductive plate connected with the PTC assembly and an auxiliary contact connected with the moving contact, the conductive plate is arranged on one side, corresponding to the moving contact, of the PTC assembly, the auxiliary contact is arranged between the conductive plate and the moving contact and is perpendicular to the conductive plate, and the other end, opposite to the moving contact, of the auxiliary contact is in sliding contact with or breaks through the conductive plate.

By adopting the technical scheme, when the moving contact moves towards the direction of the fixed contact, the auxiliary contact follow-up contact swings to contact with the current conducting plate first to form a closed auxiliary series circuit until the moving contact and the fixed contact are contacted to form a parallel circuit, when a short circuit occurs, the tripping coil assembly is matched with the tripping mechanism to disconnect the moving contact and the fixed contact, the auxiliary contact still keeps physical connection with the current conducting plate for a certain time, at the moment, current can only pass through the auxiliary contact, the current conducting plate and the serially connected PTC assembly, the temperature of the PTC assembly rises sharply, due to the PTC assembly effect, the PTC assembly limits the short-circuit current and consumes most of breaking energy, and finally the auxiliary contact follow-up contact swings to be disconnected with the current conducting plate.

The utility model discloses further set up: the installation cavity corresponds current conducting plate direction opening sets up, the installation cavity corresponds opening direction both sides and is provided with first spring leaf and second spring leaf respectively, first spring leaf set up in the PTC subassembly corresponds one side of current conducting plate and with current conducting plate body coupling, the second spring leaf set up in PTC subassembly opposite side and with trip coil subassembly elastic connection.

Through adopting above-mentioned technical scheme, fix a position the PTC subassembly through first spring leaf and second spring leaf, realize simultaneously through first spring leaf with auxiliary contact's sliding connection, realize trip coil subassembly elastic connection through the second spring leaf, realize the series connection of auxiliary circuit, the arc extinguishing cover through integrated into one piece simultaneously with arc extinguishing bars and PTC subassembly modular assembly, convenient quick installation.

The utility model discloses further set up: the PTC subassembly includes the contact piece and sets up in the PTC component of contact piece both sides, the both sides that the arc-extinguishing cover corresponds the opening direction are provided with the installation slot of the same opening direction respectively, one side that the installation slot corresponds the installation cavity is provided with the through-hole that is linked together with the installation cavity, first spring leaf include with the installation card portion of installation slot looks adaptation, stretch out the first connecting portion that the through-hole is used for connecting the card portion of PTC component and is used for being connected with the current conducting plate, the second spring leaf include with the installation card portion of installation slot looks adaptation, stretch out the second connecting portion that the through-hole is used for connecting the card portion of PTC component and is used for being connected with the trip coil subassembly.

By adopting the technical scheme, 2 PTC elements are adopted, compared with a plurality of PTC elements, the structure is simplified, the size of the module is reduced, the PTC element module can be used for a miniature circuit breaker, the structure is more reasonable, and PTC elements of different types can be adopted according to requirements, so that different current limiting capacities are achieved; the installation slot is arranged, the first spring piece and the second spring piece are installed in a clamping mode, and compared with welding, the first spring piece and the second spring piece are convenient to disassemble and replace, so that the service life of a product is prolonged, the installation is convenient and rapid, and the stability of the first spring piece and the second spring piece is improved due to the arrangement of the installation slot; the PTC component is connected with the clamping parts on the two sides, so that the PTC component is positioned, and the stability of the PTC component is improved; through first connecting portion and second connecting portion respectively with the current conducting plate, trip coil subassembly, but first spring leaf and current conducting plate integrated into one piece need not extra connecting piece, make things convenient for arc extinction mechanism integration, modularization, improve stability, while easy to assemble.

The utility model discloses further set up: and a clamping groove used for clamping the contact piece is arranged in the middle of the mounting cavity.

Through adopting above-mentioned technical scheme, the installation stability of PTC subassembly is further improved to the card portion of cooperation both sides.

The utility model discloses further set up: the arc extinguishing device is characterized in that a wire inlet cavity and a wire outlet cavity are respectively arranged on two sides of the shell, a bimetallic strip is arranged in the wire outlet cavity and connected with an arc striking plate, and the arc striking plate comprises a connecting clamp part clamped below the arc extinguishing cover, an arc extending part extending upwards towards the direction of the movable contact and a third connecting part connected with the bimetallic strip.

Through adopting above-mentioned technical scheme, arc chamber is introduced fast to the arc extinguishing that the arc extension produced because of the separation with the moving contact, carries out the arc extinguishing through the arc extinguishing bars subassembly, and the cooperation striking piece, dual striking has improved the arc extinguishing effect greatly.

The utility model discloses further set up: the first connecting portion stretches out of the arc extinguishing chamber from the opening of the installation slot, an arc isolating plate is arranged between the arc extending portion and the first connecting portion, and a sliding groove for slidably connecting the auxiliary contact and the current conducting plate is formed in the position, corresponding to the current conducting plate, of the arc isolating plate.

Through adopting above-mentioned technical scheme, set up the arc flash barrier and prevent that the electric arc that the moving contact produced from influencing auxiliary circuit, set up the sliding tray, auxiliary contact and current conducting plate sliding connection realize no arc and divide absolutely in the sliding tray.

The utility model discloses further set up: the arc isolation plate is provided with a mounting hole, and a positioning column matched with the mounting hole is arranged in the shell corresponding to the mounting hole.

Through adopting above-mentioned technical scheme, be convenient for install the flash barrier, it is good to improve the accuracy of flash barrier installation simultaneously, and stability is high.

The utility model discloses further set up: the first spring piece and the conductive plate are integrally formed, and the arc isolating plate is provided with a limiting part used for limiting the position of the conductive plate corresponding to one surface of the conductive plate.

Through adopting above-mentioned technical scheme, current conducting plate one end is connected with first spring leaf, and the other end offsets with spacing portion, and the flash barrier passes through reference column and casing location joint to accurate installation current conducting plate makes its and the accurate cooperation of sliding tray.

The utility model discloses further set up: the tripping coil assembly comprises an iron core sleeve and a coil, a static iron core is arranged on one side of the iron core sleeve corresponding to the moving contact, a moving iron core is arranged on the other side of the iron core sleeve, the iron core sleeve is hollow, the moving iron core drives the ejector rod to slide along the inner wall of the iron core sleeve, a moving hole for the ejector rod to move is formed in the static iron core, and the static contact is arranged on one side of the magnetic yoke corresponding to the moving contact.

By adopting the technical scheme, when the main circuit is in short circuit, the coil generates a magnetic field by large current, the movable iron core drives the ejector rod to eject towards the direction of the static iron core, and the tripping mechanism is driven to realize tripping of the movable contact and disconnection of the static contact.

The utility model discloses further set up: the second connecting portion is arranged between the magnet yoke and the arc extinguishing chamber, an arched connecting point is integrally arranged at the position, close to the magnet yoke, of the second connecting portion, and the connecting point is in elastic contact with the magnet yoke.

By adopting the technical scheme, the arc extinguishing chamber is convenient to clamp and install, is in elastic contact with the arc extinguishing chamber, and is more reasonable in arrangement and reliable in work.

The utility model discloses further set up: the other side of the arc extinguishing cover opposite to the opening is provided with heat dissipation holes, and the heat dissipation holes and the inner wall of the working cavity are arranged at intervals.

Through adopting above-mentioned technical scheme, because the PTC subassembly heats up fast at the during operation, set up the louvre, improve heat dispersion, increase of service life, the heat dispersion is further improved to the interval setting between louvre and the working chamber inner wall.

The following describes embodiments of the present invention with reference to the drawings and examples.

Drawings

FIG. 1 is a front view of the internal structure of the embodiment of the present invention;

fig. 2 is a perspective view of the internal structure of the embodiment of the present invention;

FIG. 3 is a perspective view of the second embodiment of the present invention;

fig. 4 is a perspective view of a partial structure of an embodiment of the present invention;

FIG. 5 is an enlarged view of the portion A of FIG. 4;

fig. 6 is a perspective view of a partial structure of the embodiment of the present invention;

fig. 7 is a perspective view of a partial structure of the embodiment of the present invention;

reference numerals are as follows: 1. the device comprises a shell, 11, a working cavity, 12, a wire inlet cavity, 13, a wire outlet cavity, 14, a positioning column, 15, a bearing part, 2, a trip coil mechanism, 21, a magnetic yoke, 211, a mounting frame, 212, a mounting part, 2121, a first mounting convex part, 2122, a mounting concave part, 22, a trip coil component, 221, an iron core sleeve, 222, a coil, 223, a static iron core, 2231, a movable hole, 224, a movable iron core, 225, an ejector rod, 3, a trip mechanism, 4, a movable contact, 5, a static contact, 51, a contact part, 52, a mounting through hole, 6, an arc extinguishing mechanism, 61, an arc extinguishing cover, 611, a mounting cavity, 6111, a heat dissipation hole, 6112, a clamping groove, 612, an arc extinguishing cavity and 613, a mounting slot, 6131, a through hole, 62, a PTC assembly, 621, a first spring piece, 6211, an installation clamping part, 6212, a clamping part, 6213, a first connecting part, 622, a second spring piece, 6221, a second connecting part, 6222, a connecting point, 623, a contact piece, 624, a PTC element, 63, an arc extinguishing grid assembly, 64, an arc striking piece, 641.L-shaped connecting part, 642, an arc striking part, 643, a second installation convex part, 7, an auxiliary switch, 71, a conductive plate, 72, an auxiliary contact, 8, a bimetallic strip, 9, an arc striking plate, 91, a connection clamping part, 92, an arc extending part, 93, a third connecting part, 10, an arc isolating plate, 101, a sliding groove, 102, an installation hole and 103, a limiting part.

Detailed Description

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Referring to fig. 1-7, the present embodiment discloses a quick arc extinguishing high breaking-rate miniature circuit breaker, including a housing 1, where the housing 1 includes a working chamber 11, a trip coil mechanism 2, a trip mechanism 3, a moving contact 4, a fixed contact 5, and an arc extinguishing mechanism 6 are disposed in the working chamber 11, the trip coil mechanism 2 includes a magnetic yoke 21 and a trip coil assembly 22, the magnetic yoke 21 includes an installation frame 211 for installing the trip coil assembly 22 and an installation part 212 disposed on one side of the installation frame 211, the installation part 212 is disposed at one end of the magnetic yoke 21 corresponding to the moving contact 4, one end of the fixed contact 5 is connected to the upper end of the installation part 212, the other end of the fixed contact is bent downward to form a contact portion 51 matched with the moving contact 4, the arc extinguishing mechanism 6 includes an arc extinguishing cover 61, a PTC assembly 62, and an arc extinguishing grid assembly 63, the arc extinguishing cover 61 includes an installation cavity 611 for installing the PTC assembly 62 and an arc extinguishing cavity 612 for installing the arc extinguishing grid assembly 63, the lower end of the installation part 212 is provided with an arc striking sheet 64, the arc striking sheet 64 includes an L-shaped connection portion 641 and an arc-shaped connection portion 642, one end of the L-shaped connection portion 641 is connected to the lower end of the installation part 212, the other end of the arc extinguishing cavity is close to the arc extinguishing cavity 642, and the arc guiding portion 51 extends toward the lower end of the arc guiding portion 642, and the arc guiding portion of the arc guiding portion 51.

The embodiment further provides that: a first mounting convex part 2121 for mounting a static contact 5 is arranged at the upper end of the mounting part 212, a mounting concave part 2122 for mounting a striking plate 64 is arranged at the lower end of the mounting part 212, a mounting through hole 52 adapted to the first mounting convex part 2121 is arranged at a position of the static contact 5 corresponding to the first mounting convex part 2121, a second mounting convex part 643 adapted to the first mounting convex part 643 is arranged at a position of the striking plate 64 corresponding to the mounting concave part 2122, and a bearing part 15 for limiting the L-shaped connecting part 641 is arranged below one end of the housing 1 corresponding to the L-shaped connecting part 641 and the mounting part 212.

The embodiment further provides that: an auxiliary switch 7 is arranged between the arc extinguishing mechanism 6 and the moving contact 4, the auxiliary switch 7 includes a conductive plate 71 connected with the PTC component 62 and an auxiliary contact 72 connected with the moving contact 4, the conductive plate 71 is arranged on one side of the PTC component 62 corresponding to the moving contact 4, the auxiliary contact 72 is arranged between the conductive plate 71 and the moving contact 4 and is perpendicular to the conductive plate 71, and the other end of the auxiliary contact 72, which is opposite to the moving contact 4, is in sliding contact with or is disconnected from the conductive plate 71.

The embodiment further provides that: the mounting cavity 611 is provided with an opening corresponding to the direction of the conductive plate 71, two sides of the mounting cavity 611 corresponding to the opening direction are respectively provided with a first spring piece 621 and a second spring piece 622, the first spring piece 621 is arranged on one side of the PTC assembly 62 corresponding to the conductive plate 71 and integrally connected with the conductive plate 71, and the second spring piece 622 is arranged on the other side of the PTC assembly 62 and elastically connected with the trip coil assembly 22.

The embodiment further provides that: the PTC assembly 62 includes a contact piece 623 and PTC elements 624 disposed on two sides of the contact piece 623, two sides of the arc-extinguishing cover 61 corresponding to the opening direction are respectively provided with an installation slot 613 with the same opening direction, one side of the installation slot 613 corresponding to the installation cavity 611 is provided with a through hole 6131 communicated with the installation cavity 611, the first spring piece 621 includes an installation clamping portion 6211 adapted to the installation slot 613, a clamping portion 6212 extending out of the through hole 6131 for connecting the PTC elements 624, and a first connecting portion 6213 for connecting with the conductive plate 71, the second spring piece 622 includes an installation clamping portion 6211 adapted to the installation slot 613, a clamping portion 6212 extending out of the through hole 6131 for connecting the PTC elements 624, and a second connecting portion 6221 for connecting with the trip coil assembly 22, a socket for extending out of the arc-extinguishing cavity 612 is disposed above the second connecting portion 613, and the socket is disposed at an opening end of the installation slot 613.

The embodiment further provides that: a clamping groove 6112 for clamping the contact piece is arranged in the middle of the mounting cavity 611.

The embodiment further provides that: an incoming line cavity 12 and an outgoing line cavity 13 are respectively arranged on two sides of the shell 1, a bimetallic strip 8 is arranged in the outgoing line cavity 13, the bimetallic strip 8 is connected with an arc striking plate 9, and the arc striking plate 9 comprises a connecting clamp part 91 clamped below the arc extinguishing cover 61, an arc extending part 92 extending upwards towards the direction of the moving contact 4 and a third connecting part 93 connected with the bimetallic strip 8.

The embodiment further provides that: the first connecting portion 6213 extends out of the arc extinguishing chamber 61 from the opening of the installation slot 613, an arc isolating plate 10 is disposed between the arc extending portion 92 and the first connecting portion 6213, and a sliding slot 101 for slidably connecting the auxiliary contact 72 and the conductive plate 71 is disposed at a position of the arc isolating plate 10 corresponding to the conductive plate 71.

The embodiment further provides that: the arc isolating plate 10 is provided with an installation hole 102, and a positioning column 14 matched with the installation hole 102 is arranged in the housing 1 at a position corresponding to the installation hole 102.

The embodiment further provides that: the first spring piece 621 is integrally formed with the conductive plate 71, and a position limiting portion 103 for limiting the position of the conductive plate 71 is disposed on one surface of the arc barrier plate 10 corresponding to the conductive plate 71.

The embodiment further provides that: the trip coil assembly 22 includes an iron core sleeve 221 and a coil 222, a stationary iron core 223 is disposed on one side of the iron core sleeve 221 corresponding to the movable contact 4, a movable iron core 224 is disposed on the other side of the iron core sleeve 221, the iron core sleeve 221 is hollow, the movable iron core 224 drives the ejector rod 225 to slide along the inner wall of the iron core sleeve 221, a movable hole 2231 for the ejector rod 225 to move is disposed on the stationary iron core 223, and the stationary contact 5 is disposed on one side of the magnetic yoke 21 corresponding to the movable contact 4.

The embodiment further provides that: the second connecting portion 6221 is disposed between the yoke 21 and the arc extinguishing chamber 61, an arched connecting point 6222 is integrally disposed at a position of the second connecting portion 6221 close to the yoke 21, and the connecting point 6222 is in elastic contact with the yoke 21.

The embodiment further provides that: the opposite side of the arc-extinguishing chamber 61 opposite to the opening is provided with heat dissipation holes 6111, and the heat dissipation holes 6111 are arranged at intervals with the inner wall of the working chamber 11.

The above-mentioned "between" does not only mean between orientations and positions, but also means between interactions of different parts.

In the description herein, it will be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings to simplify the description of the present invention, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention.

Although the housing 1, the working chamber 11, the wire inlet chamber 12, the wire outlet chamber 13, the positioning post 14, the receiving portion 15, the trip coil mechanism 2, the yoke 21, the mounting bracket 211, the mounting portion 212, the first mounting protrusion 2121, the mounting recess 2122, the trip coil assembly 22, the core bushing 221, the coil 222, the stationary core 223, the movable hole 2231, the movable core 224, the ejector rod 225, the trip mechanism 3, the movable contact 4, the stationary contact 5, the contact portion 51, the mounting through hole 52, the arc extinguishing mechanism 6, the arc extinguishing cover 61, the mounting chamber 611, the heat dissipation hole 6111, the clamping groove 6112, the arc extinguishing chamber 612, the mounting slot 613, the through hole 6131, the ptc assembly 62, the first spring plate 621, the mounting clamping portion 6211, the clamping portion 6212, the first connecting portion 6213, the second spring plate 622, the second connecting portion 6221, the connecting portion 6222, the contact piece 623, the ptc element, the grid assembly 63, the arc striking plate 64, the l-shaped connecting portion 641, the arc striking portion 642, the arc extinguishing portion 643, the auxiliary switch 7, the auxiliary switch 71, the arc striking plate 91, the arc extinguishing plate 92, the sliding contact portion 102, the sliding portion 102, and the like are more commonly used. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. The utility model provides a quick arc extinguishing high divides disconnected miniature circuit breaker, includes the casing, the casing includes the working chamber, be provided with trip coil mechanism, tripping device, moving contact, static contact and arc extinguishing mechanism in the working chamber, its characterized in that: trip coil mechanism includes yoke and trip coil subassembly, the yoke is including being used for the installation trip coil subassembly's mounting bracket with set up in the installation department of mounting bracket one side, the installation department sets up in the yoke and corresponds the one end of moving contact, static contact one end is connected with the installation department upper end, other end buckle downwards form with moving contact complex contact site, arc extinguishing mechanism includes arc extinguishing chamber, PTC subassembly and arc extinguishing bars subassembly, the arc extinguishing chamber is including being used for the installation cavity of PTC subassembly and the arc extinguishing chamber that is used for installing the arc extinguishing bars subassembly, the lower extreme of installation department is provided with the striking piece, the striking piece includes L type connecting portion and arc-leading portion, L type connecting portion one end with the lower extreme of installation department is connected, and the other end is buckled and is pressed close to the contact site, the upper end of arc-leading portion is close to the lower extreme of contact site, the lower extreme of arc-leading portion extends to arc chamber direction.

2. The quick arc extinguishing high breaking micro breaker according to claim 1, characterized in that: an auxiliary switch is arranged between the arc extinction mechanism and the moving contact, the auxiliary switch comprises a conductive plate connected with the PTC component and an auxiliary contact connected with the moving contact, the conductive plate is arranged on one side, corresponding to the moving contact, of the PTC component, the auxiliary contact is arranged between the conductive plate and the moving contact and perpendicular to the conductive plate, and the other end, opposite to the moving contact, of the auxiliary contact is in sliding contact with or breaks through the conductive plate.

3. The quick arc extinguishing high breaking micro breaker according to claim 2, characterized in that: the installation cavity corresponds current conducting plate direction opening sets up, the installation cavity corresponds opening direction both sides and is provided with first spring leaf and second spring leaf respectively, first spring leaf set up in the PTC subassembly corresponds one side of current conducting plate and with current conducting plate body coupling, the second spring leaf set up in PTC subassembly opposite side and with trip coil subassembly elastic connection.

4. The quick arc extinguishing high breaking micro breaker according to claim 3, characterized in that: the PTC subassembly includes the contact piece and sets up in the PTC component of contact piece both sides, the both sides that the arc-extinguish chamber corresponds the opening direction are provided with the installation slot of the same opening direction respectively, one side that the installation slot corresponds the installation cavity is provided with the through-hole that is linked together with the installation cavity, first spring leaf include with the installation card portion of installation slot looks adaptation, stretch out the first connecting portion that the through-hole is used for connecting the card portion of PTC component and is used for being connected with the current conducting plate, the second spring leaf include with the installation card portion of installation slot looks adaptation, stretch out the second connecting portion that the through-hole is used for connecting the card portion of PTC component and is used for being connected with the trip coil subassembly.

5. The quick arc extinguishing high breaking micro breaker according to claim 4, characterized in that: the arc extinguishing device is characterized in that a wire inlet cavity and a wire outlet cavity are respectively arranged on two sides of the shell, a bimetallic strip is arranged in the wire outlet cavity and connected with an arc striking plate, and the arc striking plate comprises a connecting clamp part clamped below the arc extinguishing cover, an arc extending part extending upwards towards the direction of the movable contact and a third connecting part connected with the bimetallic strip.

6. The quick arc extinguishing high breaking micro breaker according to claim 5, characterized in that: the first connecting portion stretches out of the arc extinguishing chamber from the opening of the installation slot, an arc isolating plate is arranged between the arc extending portion and the first connecting portion, and a sliding groove for slidably connecting the auxiliary contact and the current conducting plate is formed in the position, corresponding to the current conducting plate, of the arc isolating plate.

7. The quick arc extinguishing high breaking micro breaker according to claim 6, characterized in that: the arc isolating plate is provided with a mounting hole, and a positioning column matched with the mounting hole is arranged in the shell corresponding to the mounting hole.

8. The quick arc extinguishing high breaking micro breaker according to claim 4, characterized in that: the tripping coil assembly comprises an iron core sleeve and a coil, wherein a static iron core is arranged on one side of the iron core sleeve corresponding to the moving contact, a moving iron core is arranged on the other side of the iron core sleeve, the iron core sleeve is hollow and arranged in the iron core sleeve, the moving iron core drives the ejector rod to slide along the inner wall of the iron core sleeve, a moving hole for the ejector rod to move is formed in the static iron core, and the static contact is arranged on one side of the magnetic yoke corresponding to the moving contact.

9. The quick arc extinguishing high breaking micro breaker according to claim 8, characterized in that: the second connecting portion is arranged between the magnet yoke and the arc extinguishing chamber, an arched connecting point is integrally arranged at the position, close to the magnet yoke, of the second connecting portion, and the connecting point is in elastic contact with the magnet yoke.

10. A fast arc extinguishing high breaking miniature circuit breaker according to claim 3, characterized in that: the other side of the arc extinguishing cover opposite to the opening is provided with heat dissipation holes, and the heat dissipation holes and the inner wall of the working cavity are arranged at intervals.