CN215527663U

CN215527663U - Plastic case circuit breaker

Info

Publication number: CN215527663U
Application number: CN202122068459.3U
Authority: CN
Inventors: 易梅
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-01-14
Anticipated expiration: 2031-08-31

Abstract

A molded case circuit breaker. The problems of complex structure and high cost of the conventional tripping system are solved. The hot tripping device comprises a shell, a hot tripping mechanism and a magnetic tripping mechanism, wherein a traction rod and a conductive bar are arranged in the shell, the hot tripping mechanism and the magnetic tripping mechanism are matched with the traction rod, and the product is tripped through the action of the traction rod, the hot tripping mechanism comprises a hot driving piece, and the hot driving piece is arranged in an L shape. The utility model has the advantages that the L-shaped thermal driving piece is arranged, the structure of the thermal driving piece is simplified, the arrangement of a transmission part is reduced, the production cost is reduced, the product is convenient to install, and the product action is simpler and more reliable.

Description

Plastic case circuit breaker

Technical Field

The utility model relates to the field of low-voltage power distribution, in particular to a molded case circuit breaker.

Background

The molded case circuit breaker is also called a device type circuit breaker, all parts are sealed in a plastic shell, and an auxiliary contact, an undervoltage release, a shunt release and the like are modularized. The molded case circuit breaker generally includes a contact system, an arc extinguishing system, an operating mechanism, a trip mechanism, an overcurrent protection system, a short circuit protection system, and the like. Although the existing tripping system of the molded case circuit breaker is provided with a thermal tripping system (overload protection system) and a magnetic tripping system (short-circuit protection system), the existing tripping system is complex, and secondary current induced by a mutual inductor is required to heat a bimetallic strip (the bimetallic strip is a composite material consisting of two or more metals with proper properties or other materials).

SUMMERY OF THE UTILITY MODEL

The utility model provides a molded case circuit breaker, aiming at solving the problems of complex structure and high cost of the existing tripping system in the background technology.

The technical scheme of the utility model is as follows: the utility model provides a moulded case circuit breaker, includes casing, hot tripping device and magnetism tripping device, the casing in be equipped with the traction lever and electrically conduct and arrange, hot tripping device, magnetism tripping device all mutually support and realize the product dropout through the action of traction lever with the traction lever, hot tripping device include hot driving piece, hot driving piece be the setting of L type.

As a further improvement of the utility model, the thermal driving piece comprises a first arm and a second arm, the first arm is connected with the second arm, and the second arm is provided with a pushing piece used for pushing the traction rod to act to realize tripping.

As a further improvement of the present invention, a fixing hole for fixing is provided at an end of the first arm, and a fixing screw for fixing the first arm to the conductive bar is provided in the fixing hole.

As a further improvement of the utility model, the end part of the second arm is provided with a mounting hole for accommodating the pushing piece.

As a further improvement of the utility model, the length of the first arm is not less than 20 mm.

As a further improvement of the utility model, the area of the connecting end of the second arm and the first arm is larger than that of the end far away from the first arm, and the pushing piece is arranged on the second arm far away from the end of the first arm.

As a further improvement of the utility model, the first arm is a thermal bimetallic strip, and the second arm and the first arm are of an integrated structure.

As a further improvement of the utility model, the first arm is a thermal bimetallic strip, and the second arm and the first arm are of split structures and are connected with the first arm through bolt fixation, welding fixation or clamping fixation.

As a further improvement of the utility model, the magnetic tripping mechanism comprises a static iron core and a movable iron core, wherein a transmission part is arranged on the movable iron core, and the transmission part is connected with the traction rod and drives the traction rod to act when the movable iron core acts so as to trip the product.

As a further improvement of the utility model, the traction rod is provided with a driving plate, the driving plate is provided with a notch groove, the transmission member is inserted into the notch groove, one end of the transmission member is provided with a driving part for driving the driving plate to act, and the other end of the transmission member is inserted into the movable iron core and is in threaded connection with the movable iron core.

The utility model has the advantages that the L-shaped thermal driving piece is arranged, the structure of the thermal driving piece is simplified, the arrangement of a transmission part is reduced, the production cost is reduced, the product is convenient to install, and the product action is simpler and more reliable.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic structural view in another direction of fig. 1.

Fig. 3 is an enlarged schematic view of a portion a of fig. 2.

Fig. 4 is an exploded view of an embodiment of the present invention.

In the figure, 1, a thermal trip mechanism; 2. a magnetic trip mechanism; 21. a stationary iron core; 22. a movable iron core; 23. a transmission member; 231. a drive section; 3. a draw bar; 31. a drive plate; 311. a notch groove; 4. A conductive bar; 5. a thermal drive member; 51. a first arm; 511. a fixing hole; 512. fixing screws; 52. a second arm; 521. mounting holes; 6. and pushing the piece.

Detailed Description

The embodiments of the utility model will be further described with reference to the accompanying drawings in which:

as shown in fig. 1 and fig. 2-4, the molded case circuit breaker comprises a shell, a thermal tripping mechanism 1 and a magnetic tripping mechanism 2, wherein a draw bar 3 and a conductive bar 4 are arranged in the shell, the thermal tripping mechanism 1 and the magnetic tripping mechanism 2 are matched with the draw bar 3, and the product tripping is realized through the action of the draw bar 3, the thermal tripping mechanism 1 comprises a thermal driving piece 5, and the thermal driving piece 5 is arranged in an L shape. The utility model has the advantages that the L-shaped thermal driving piece is arranged, the structure of the thermal driving piece is simplified, the arrangement of a transmission part is reduced, the production cost is reduced, the product is convenient to install, and the product action is simpler and more reliable.

The thermal driving member 5 comprises a first arm 51 and a second arm 52, the first arm 51 is connected with the second arm 52, and the second arm 52 is provided with a pushing member 6 for pushing the traction rod 3 to release. The pushing piece is arranged, so that the traction rod can be driven to act reliably when the thermal driving piece deforms, and the product can be released reliably.

The end of the first arm 51 is provided with a fixing hole 511 for fixing, and a fixing screw 512 for fixing the first arm 51 to the conductive bar 4 is arranged in the fixing hole 511. The fixing holes and the fixing screws are arranged, so that the product can be fixed conveniently, the structure is simple, and the fixation is convenient and reliable.

The end of the second arm 52 is provided with a mounting hole 521 for accommodating the pushing member 6. The structure is convenient for the installation of the pushing piece, and the pushing piece is convenient and reliable to fix.

The length of the first arm 51 is not less than 20 mm. Such setting is favorable to increasing the crooked range of L type hot driving piece, and the circuit breaker reaction is more sensitive, thereby is convenient for reliably warp and drives the traction lever action for the product is tripped.

The area of the connecting end of the second arm 52 and the first arm 51 is larger than that of the end far away from the first arm 51, and the pushing piece 6 is arranged on the second arm far away from the end of the first arm 51. The structure is convenient for the first arm to deform and reliably drive the second arm to move, simultaneously reduces the material of the second arm, reduces the production cost and avoids interference.

The first arm 51 is a thermal bimetallic strip, and the second arm 52 and the first arm 51 are of an integrated structure. In the first embodiment of the present invention, the first arm is a thermal bimetal, the second arm is also a thermal bimetal, and the material of the second arm is the same as that of the first arm, but the first arm and the second arm may be an integrated structure in an actual production process. In the second embodiment of the present invention, the first arm 51 is a thermal bimetallic strip, and the second arm 52 and the first arm 51 are of a split structure and are connected to the first arm 51 by bolt fastening, welding fastening or clamping fastening. In the second embodiment of the present invention, the second arm and the first arm may be made of different materials and connected to each other, and at this time, the first arm and the second arm may be reliably connected by bolt fastening, welding fastening, or clamping.

The magnetic tripping mechanism 2 comprises a static iron core 21 and a movable iron core 22, wherein a transmission piece 23 is arranged on the movable iron core 22, and the transmission piece 23 is connected with the traction rod 3 and drives the traction rod 3 to act when the movable iron core 22 acts so as to trip a product. The structure ensures that the movable iron core can reliably drive the traction rod to act through the transmission part, so that the product is reliably released, and the structure is simple, convenient to install and reliable in performance. Specifically speaking, the quiet iron core on be equipped with the support frame, the support frame be the setting of U type, the movable iron core locate in the support frame of U type. The supporting frame is arranged, so that the product is simple in structure and convenient to install, the magnetic circuit is convenient to form and then the iron core is moved reliably, and the transmission part can reliably drive the traction rod to rotate and trip through the moving iron core.

The traction rod 3 is provided with a driving plate 31, the driving plate 31 is provided with a notch groove 311, the transmission piece 23 is inserted into the notch groove 311, one end of the transmission piece 23 is provided with a driving part 231 for driving the driving plate 31 to move, and the other end of the transmission piece 23 is inserted into the movable iron core 22 and is in threaded connection with the movable iron core 22. The structure ensures that the transmission part can reliably drive the traction rod to rotate to release through the movable iron core, has simple structure, convenient installation and reliable performance, reasonably utilizes the space in the shell, and ensures that the whole structure of a release system is simplified and the action is reliable when the breaking performance of a product is ensured. The arrangement of the guide hole plays a role in guiding the movement of the transmission member, so that the product can move reliably. The static iron core is arranged in a U shape and fixed on the conductive bar. The structure enables the product to generate a magnetic circuit through the static iron core, so that the product drives the draw bar to break the circuit breaker through the movable iron core and the transmission part when in short circuit.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The skilled person should understand that: although the present invention has been described in terms of the above embodiments, the inventive concepts are not limited to the embodiments, and any modifications that utilize the inventive concepts are intended to be included within the scope of the appended claims.

Claims

1. A molded case circuit breaker comprises a shell, a thermal tripping mechanism (1) and a magnetic tripping mechanism (2), and is characterized in that a draw bar (3) and a conductive bar (4) are arranged in the shell, the thermal tripping mechanism (1) and the magnetic tripping mechanism (2) are matched with the draw bar (3) and realize product tripping through the action of the draw bar (3), the thermal tripping mechanism (1) comprises a thermal driving piece (5), and the thermal driving piece (5) is arranged in an L shape.

2. A molded case circuit breaker according to claim 1, wherein said thermal driving member (5) comprises a first arm (51) and a second arm (52), said first arm (51) is connected to said second arm (52), and said second arm (52) is provided with a pushing member (6) for pushing said pulling rod (3) to release.

3. A molded case circuit breaker according to claim 2, wherein the end of the first arm (51) is provided with a fixing hole (511) for fixing, and a fixing screw (512) for fixing the first arm (51) to the conductive bar (4) is provided in the fixing hole (511).

4. A molded case circuit breaker according to claim 2, wherein the second arm (52) has a mounting hole (521) at an end thereof for receiving the push-piece (6).

5. A molded case circuit breaker according to claim 2, wherein said first arm (51) has a length of not less than 20 mm.

6. A molded case circuit breaker according to claim 2, wherein the area of the connection end of the second arm (52) and the first arm (51) is larger than the area of the end far from the first arm (51), and the push-piece (6) is provided on the second arm far from the end of the first arm (51).

7. A molded case circuit breaker according to claim 2, wherein said first arm (51) is a thermal bimetal, and said second arm (52) is of an integral structure with said first arm (51).

8. A molded case circuit breaker according to claim 2, wherein said first arm (51) is a bimetal, and said second arm (52) and said first arm (51) are of a split structure and are connected to said first arm (51) by means of bolt fastening, welding fastening or snap fastening.

9. A molded case circuit breaker according to claim 1, wherein said magnetic trip mechanism (2) comprises a static iron core (21) and a movable iron core (22), said movable iron core (22) is provided with a transmission member (23), said transmission member (23) is connected to the pull rod (3) and drives the pull rod (3) to operate when the movable iron core (22) operates, so as to trip the product.

10. A molded case circuit breaker according to claim 9, wherein said draw bar (3) is provided with a driving plate (31), said driving plate (31) is provided with a notch groove (311), said transmission member (23) is inserted into said notch groove (311), one end of said transmission member (23) is provided with a driving portion (231) for actuating said driving plate (31), and the other end is inserted into said movable iron core (22) and is threadedly connected to said movable iron core (22).