CN214477288U

CN214477288U - Tripping mechanism of molded case circuit breaker

Info

Publication number: CN214477288U
Application number: CN202120443492.7U
Authority: CN
Inventors: 王海良; 柴刚强
Original assignee: Minpu Electric Group Co Ltd
Current assignee: Minpu Electric Group Co Ltd
Priority date: 2021-03-01
Filing date: 2021-03-01
Publication date: 2021-10-22
Anticipated expiration: 2031-03-01

Abstract

The utility model relates to a moulded case circuit breaker's tripping device, including traction lever, support, with leg joint's wiring conductor, setting on the support and form linkage complex armature with the traction lever, the support is the U style of calligraphy, and the both sides of support are provided with the locating plate respectively, the upper end of locating plate forms the recess, the both ends at armature middle part are connected respectively in the recess, armature includes spacing portion and at least one action portion, form in the action portion and strike the end and draw the end, be connected with the extension spring between traction end and the locating plate, strike the end and form linkage cooperation along with armature at recess internal rotation and traction lever. The utility model discloses moulded case circuit breaker's tripping device adopts the formula mounting means that cut straightly, has simplified tripping device's overall structure, and the assembly of being convenient for promotes production efficiency.

Description

Tripping mechanism of molded case circuit breaker

Technical Field

The utility model relates to a circuit breaker especially relates to a moulded case circuit breaker's tripping device.

Background

The molded case circuit breaker can automatically cut off the current after the current exceeds the trip setting. Plastic housing refers to the use of plastic insulators as the outer housing of the device to isolate the conductors from each other and from the grounded metal parts.

The molded case circuit breaker is provided with a tripping mechanism which generally comprises a draw bar, a bimetallic strip, an armature and the like, and when the passing current is larger than the rated current and smaller than a certain preset current standard range (overload tripping mode), the bimetallic strip is heated and bent and pushes the draw bar to realize tripping and tripping; when the power line is short-circuited (in a short-circuit tripping mode), the current is instantly increased to reach the standard range, a magnetic field is generated, the armature is attracted to drive the traction rod to act, and tripping and brake separating are realized. The structure of short circuit dropout on current moulded case circuit breaker exists the problem that the structure is complicated, leads to tripping device's assembly process loaded down with trivial details, the cost of labor is high, makes production efficiency low, in addition in the past will connect the line conductor and pass back type support and not relieve rather than, back type support has restricted the size of line conductor greatly, and line conductor is too narrow or flat can influence the temperature rise performance and the current-carrying property of line conductor.

Disclosure of Invention

In view of this, the utility model aims at providing a moulded case circuit breaker's tripping device that the structure is retrencied, the action is stable optimizes its short circuit tripping device to improve moulded case circuit breaker's production efficiency, and do not influence the current-carrying performance of wiring conductor.

In order to realize above mesh, the utility model discloses a such moulded case circuit breaker's tripping device, including traction lever, support, with leg joint's wiring conductor, setting on the support and form linkage complex armature with the traction lever, the support is the U style of calligraphy, and the both sides of support are provided with the locating plate respectively, the upper end of locating plate forms the recess, the both ends at armature middle part are connected respectively in the recess, armature includes spacing portion and at least one action portion, form in the action portion and strike the end and draw the end, be connected with the extension spring between draw end and the locating plate, strike the end and form linkage cooperation along with armature at recess internal rotation and traction lever.

Above-mentioned armature adopts the mode of cuting straightly, can directly put armature in the recess of locating plate during the assembly, again with the extension spring connect pull end and locating plate between can, this moulded case circuit breaker's tripping device carries out short circuit tripping action mode and does: when the molded case circuit breaker is in a short circuit (a large current passes through a wiring conductor instantly), the support generates an electromagnetic field enough to attract the armature, the armature trains and transmits in the groove of the positioning plate, the limiting part of the armature is attracted to the support, the tension spring is stretched, the knocking end touches the traction rod to act, so that the operating mechanism of the molded case circuit breaker acts to complete tripping, the short circuit protection of the molded case circuit breaker is realized, the armature resets after tripping is completed, and the tension spring returns to an initial state. The utility model discloses moulded case circuit breaker's tripping device adopts the formula mounting means that cut straightly, has simplified tripping device's overall structure, and the assembly of being convenient for promotes production efficiency, and U type support can not restrict the width and the thickness of wiring conductor to guarantee the current-carrying performance of wiring conductor.

The utility model discloses further set up to action portion and be provided with two, two action portion symmetries set up the both ends in spacing portion, draw and serve and form the hanging hole, be close to this and draw and form on the locating plate of end and hang the hole down, the one end of extension spring is connected in last hanging hole, and the other end of extension spring is connected under in the hanging hole.

The two action parts are symmetrically arranged at two ends of the limiting part and can be connected with the positioning plates at two sides by the tension springs respectively, so that the action of the armature is more stable and reliable when the molded case circuit breaker is in short circuit, and the tripping protection is ensured.

The utility model discloses further set up to the recess and be the V style of calligraphy, the side of action portion forms the cambered surface end, the cambered surface end is connected in the recess.

The arc-shaped end enables the armature to move more smoothly in the groove.

The utility model discloses further set up to forming the dog on the locating plate, the dog is located spacing portion along with armature on the route of recess internal rotation.

The utility model discloses further set up to the support including the bottom plate that is located wiring conductor bottom and the curb plate that is located wiring conductor both sides, spacing portion forms the linkage cooperation along with armature at recess internal rotation and curb plate.

This practicality further sets up to the width of spacing portion and is greater than the perpendicular distance between two curb plates.

The stop block is used for limiting when the armature resets, and the width of the limiting part is larger than the vertical distance between the two side plates and is used for limiting when the armature short-circuits.

This practicality further sets up to still be provided with the bimetallic strip on the conductor of working a telephone switchboard, the upper end of bimetallic strip is provided with the touching piece, the touching piece is generated heat the action and is formed the linkage cooperation with the traction lever along with the bimetallic strip.

The utility model is further arranged that the bimetallic strip is positioned between the two action parts.

The position of the bimetallic strip is arranged between the two action parts, so that the whole structure of the tripping mechanism is more reasonable.

Drawings

Fig. 1 is a perspective view of an embodiment of the present invention.

Fig. 2 is another perspective view of the embodiment of the present invention.

Fig. 3 is a perspective view of a part of a tripping mechanism according to an embodiment of the present invention.

Detailed Description

As shown in fig. 1-3, the present invention relates to a tripping mechanism of a molded case circuit breaker, comprising a drawbar 1, a support 2, a wiring conductor 3 connected to the support 2, an armature 4 disposed on the support 2 and forming a linkage fit with the drawbar 1, and a bimetal 7 connected to the wiring conductor 3, wherein a touch member 71 is disposed at the upper end of the bimetal 7, the touch member 71 forms a linkage fit with the drawbar 1 along with the heating action of the bimetal, the support 2 is U-shaped, the support 2 comprises a bottom plate 21 disposed at the bottom of the wiring conductor 3 and side plates 22 disposed at both sides of the wiring conductor 3, positioning plates 5 are disposed at both sides of the support 2, a groove 51 is formed at the upper end of the positioning plate 5, the groove 51 is V-shaped, the armature 4 comprises a limiting portion 41 and two action portions 42, and the two action portions 42 are symmetrically disposed at both ends of the limiting portion 41, the actuating portion 42 is provided with a knocking end 421 and a traction end 422, the side edge of the actuating portion 42 is provided with an arc surface end 423, the arc surface end 423 is connected in the groove 51, the traction end 422 is provided with an upper hanging hole 4221, a positioning plate 5 close to the traction end 422 is provided with a lower hanging hole 52, a tension spring 6 is connected between the traction end 422 and the positioning plate 5, one end of the tension spring 6 is connected in the upper hanging hole 4221, the other end of the tension spring 6 is connected in the lower hanging hole 52, the knocking end 421 forms linkage fit with the traction rod 1 along with the rotation of the armature 4 in the groove 51, the positioning plate 5 is provided with a stop dog 53, the stop dog 53 is positioned on the path of the limiting portion 41 along with the rotation of the armature 4 in the groove 51, the limiting portion 41 forms linkage fit with the side plate 22 along with the rotation of the armature 4 in the groove 51, and the width of the limiting portion 41 is larger than the vertical distance between the two side plates 22, the bimetal 7 is located between the two acting portions 42.

According to the above embodiment, the utility model discloses moulded case circuit breaker's tripping device working method does: when the molded case circuit breaker is in a short circuit (a large current passes through a wiring conductor instantly), the support generates an electromagnetic field enough to attract the armature, the armature trains and transmits in the groove of the positioning plate, the limiting part of the armature is attracted to the support, the tension spring is stretched, the knocking end touches the traction rod to act, so that the operating mechanism of the molded case circuit breaker acts to complete tripping, the short circuit protection of the molded case circuit breaker is realized, the armature resets after tripping is completed, and the tension spring returns to an initial state.

In addition to the above embodiments, there are also other embodiments of the present invention, and those skilled in the art can make various corresponding changes and modifications according to the present invention without departing from the spirit and scope of the present invention, and those changes and modifications are equivalent to the technical solutions in the present patent, and then those corresponding changes and modifications are all within the scope of the appended claims.

Claims

1. The utility model provides a moulded case circuit breaker's tripping device, includes traction lever, support, the wiring conductor of being connected with the support, set up on the support and form linkage complex armature with the traction lever, its characterized in that: the support is the U style of calligraphy, and the both sides of support are provided with the locating plate respectively, the upper end of locating plate forms the recess, the both ends at armature middle part are connected respectively in the recess, armature includes spacing portion and at least one action portion, form on the action portion and strike the end and draw the end, be connected with the extension spring between draw end and the locating plate, strike the end and form the linkage cooperation along with armature at recess internal rotation and traction lever.

2. The trip mechanism of the molded case circuit breaker according to claim 1, wherein: the action portions are arranged in two, the two action portions are symmetrically arranged at two ends of the limiting portion, an upper hanging hole is formed in the traction end, a lower hanging hole is formed in a positioning plate close to the traction end, one end of the tension spring is connected in the upper hanging hole, and the other end of the tension spring is connected in the lower hanging hole.

3. The trip mechanism of the molded case circuit breaker according to claim 2, wherein: the groove is V-shaped, the side of the action part forms an arc surface end, and the arc surface end is connected in the groove.

4. The trip mechanism of a molded case circuit breaker according to claim 1, 2 or 3, wherein: a stop block is formed on the positioning plate and is positioned on a path of the limiting part rotating along with the armature in the groove.

5. The trip mechanism of a molded case circuit breaker according to claim 1, 2 or 3, wherein: the support comprises a bottom plate located at the bottom of the wiring conductor and side plates located on two sides of the wiring conductor, and the limiting portion rotates in the groove along with the armature and forms linkage fit with the side plates.

6. The trip mechanism of the molded case circuit breaker according to claim 5, wherein: the width of the limiting part is larger than the vertical distance between the two side plates.

7. The trip mechanism of the molded case circuit breaker according to claim 2 or 3, wherein: the connecting device is characterized in that a bimetallic strip is further arranged on the connecting conductor, a touch piece is arranged at the upper end of the bimetallic strip, and the touch piece moves along with the bimetallic strip to form linkage fit with the traction rod.

8. The trip mechanism of the molded case circuit breaker according to claim 7, wherein: the bimetallic strip is positioned between the two action parts.