CN210607146U - Small-sized circuit breaker - Google Patents

Abstract

The utility model relates to a miniature circuit breaker, be provided with the handle support on its handle, the handle support is together rotated along with the handle, form the crimping piece on the handle support, one side formation boss by the handle support is supported to the contact, the formation linkage cooperation is connected to crimping piece and boss, one side of hasp is provided with the setting element, form the dog in the casing, the setting element supports and presses on the dog, form the location axle on the contact support, the moving contact is worn to put epaxially in the location, the epaxial cover in location is equipped with the torsional spring, the one end of torsional spring is connected on the moving contact, the other end of torsional spring is connected on the contact support. The utility model discloses a miniature circuit breaker can delay moving contact and static contact closed completely at reclosing lock in-process, and under there being the short circuit condition in the circuit, should the electric repulsion can make circuit breaker separating brake in shorter time, restriction short-circuit current to provide breaking capacity, and simplify operating device's spare part and the assembly degree of difficulty, thereby improve operating device's reliability and assembly efficiency.

Description

Small-sized circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus field especially relates to a miniature circuit breaker.

Background

The circuit breaker can effectively improve the safety and reliable operation of electrical equipment, and in order to meet the installation requirements of different electrical equipment, the miniature circuit breaker is used as an important and common type electrical switch, has various structures and tends to be miniaturized as a whole, and is mainly used in various places such as industrial, commercial and civil houses. The existing small-sized circuit breaker has the following problems: 1. after the existing miniature circuit breaker breaks down, if the fault is not eliminated, the handle is directly switched to a closed state, and the whole process of rotating the handle directly drives the operating mechanism to act, so that a moving contact and a static contact are already touched when the operating handle rotates by a certain angle, the breaking time of the circuit breaker is longer under the condition that the fault still exists in a circuit, the short-circuit current limiting of the mechanism is poor, and the influence and even the burnout are generated on electric equipment on the circuit; 2. the jump buckle and the lock catch of the miniature circuit breaker are matched by arranging the torsion spring, so that the structure has more parts and complex assembly, and the assembly efficiency is reduced; 3. when the miniature circuit breaker is in a closed state, reliable electrical connection performance needs to be achieved, and due to the fact that the moving contact is rigidly connected to the contact support, the moving contact is enabled to keep a certain pressure on the static contact through the torsion spring arranged on the contact support in the prior art, but the moving contact is high in installation accuracy of the moving contact, and assembly is difficult.

Disclosure of Invention

In view of this, the utility model aims at providing a miniature circuit breaker can break off miniature circuit breaker's operating device on the fault line fast, restricts the short-circuit current, improves the breaking capacity to simplify operating device, reduce assembly spare part and step, thereby improve operating device's reliability and assembly efficiency.

In order to achieve the above object, the present invention adopts such a miniature circuit breaker, which comprises a housing and an operating mechanism disposed in the housing, wherein the operating mechanism comprises a handle, a U-shaped connecting rod, a contact support, a latch, a jump buckle, and a moving contact, the two ends of the U-shaped connecting rod are respectively connected with the handle and the jump buckle, the latch, and the moving contact are all connected to the contact support, the latch and the jump buckle are connected to form a linkage fit, the handle is provided with a handle support, the handle support rotates together with the handle, the handle support is provided with a press-connecting block, one side of the contact support, which is close to the handle support, forms a boss, the press-connecting block and the boss are connected to form a linkage fit, one side of the latch is provided with a positioning member, the housing forms a stop, the positioning member presses against the stop, the contact support forms a positioning shaft, and the moving contact is disposed on the positioning shaft, the locating shaft is sleeved with a torsion spring, one end of the torsion spring is connected to the movable contact, and the other end of the torsion spring is connected to the contact support.

The miniature circuit breaker has the following advantages: 1. when the miniature circuit breaker is in a breaking state and a fault on a line is not eliminated, in the process that a user directly joints the handle, the pressing block and the boss are mutually abutted, so that the contact support cannot act along with the handle in the first half of the rotation process of the handle, and after the pressing block is separated from the boss, the trip buckle can drive the contact support to act under the linkage of the U-shaped connecting rod, so that compared with the prior art, the linkage mode of the operating mechanism can delay the moving contact to touch the fixed contact in the closing process, the operating mechanism of the miniature circuit breaker on the fault line is quickly disconnected, the short-circuit current is limited, the breaking capacity is improved, the switching-on time of the miniature circuit breaker under the condition that the line still has a fault is shortened, the damage to electric equipment on the line is reduced, and the linkage mode has a great significance in; 2. the positioning piece is formed on the lock catch and matched with the stop block on the shell, so that the lock catch and the jump buckle are linked, the structure of the operating mechanism is simplified, and the assembly efficiency is improved; 3. the torsion spring is arranged on the movable contact, so that after the miniature circuit breaker is switched on, the movable contact forms certain pressure on the fixed contact to form overtravel, reliable electric connection performance is achieved, and the structure reduces the installation precision of the movable contact fixed on the contact support.

The utility model discloses further set up to form the handle connecting axle on the casing, handle and handle supporting piece are all connected on the handle connecting axle, form the notch of certain angle on the handle, the crimping piece is located the notch.

The structure can further delay the moving contact to touch the static contact in the switching-on process, namely, the stroke that the side wall of the notch touches the compression joint block is increased, and the notch is formed at the same time, namely, the handle is used for driving the handle supporting piece to rotate.

This practicality further sets up to the one side that the boss was kept away from to the crimping piece forms the end that resets, form the portion that resets on the notch, the end that resets is connected with the portion that resets and is formed the linkage.

The reset end and the reset part are arranged so that when the miniature circuit breaker is changed from a closing state to an opening state, the reset part of the handle applies an acting force to the reset end to enable the handle supporting piece to reset to an initial position and enable the crimping block to be connected with the boss again to form linkage.

This practicality further sets up to form the arc wall on the movable contact, the one end of torsional spring is connected in the arc wall.

The structure can improve the pressure of the torsional spring acting on the moving contact, and ensure the reliability of electric connection after the miniature circuit breaker is switched on.

The utility model discloses further set up to the setting element and form the location end that extends to the dog, the location end supports and presses on the dog.

The utility model discloses further set up to the side of hasp and form the fixed orifices, the side of setting element forms the fixed column, the setting element passes through the cooperation of fixed column and fixed orifices and connects on the hasp.

Above-mentioned location end injection moulding and snap-on are in one side of hasp, and only need during the assembly with the location end support press on the dog can for the installation cooperation is convenient.

Drawings

Fig. 1 is an exploded view of an embodiment of the present invention.

Fig. 2 is a perspective view of the operating mechanism of the embodiment of the present invention with the torsion spring removed.

Fig. 3 is an exploded view of the operating mechanism according to the embodiment of the present invention.

Detailed Description

As shown in fig. 1-3, the utility model relates to a miniature circuit breaker, which comprises a casing 1 and an operating mechanism arranged in the casing 1, wherein the operating mechanism comprises a handle 2, a U-shaped connecting rod 3, a contact support 4, a lock catch 5, a jump buckle 6 and a moving contact 7, a handle connecting shaft 12 is formed on the casing 1, the two ends of the U-shaped connecting rod 3 are respectively connected with the handle 2 and the jump buckle 6, the lock catch 5 and the moving contact 7 are all connected on the contact support 4, the lock catch 5 and the jump buckle 6 are connected to form linkage fit, the handle 2 is provided with a handle support 8, the handle 2 and the handle support 8 are both connected on the handle 12, the handle support 8 rotates along with the handle connecting shaft 2, a pressure connecting block 81 is formed on the handle support 8, a notch 21 with a certain angle is formed on the handle 2, the pressure connecting block 81 is positioned in the notch 21, a boss 41 is formed on one side of the contact support 4 close to the handle support 8, the press-connecting block 81 and the boss 41 are connected to form linkage fit, a reset end 82 is formed on one side of the press-connecting block 81 far away from the boss 41, a reset part 22 is formed on the notch 21, the reset end 82 and the reset part 22 are connected to form linkage, a positioning part 9 is arranged on one side of the lock catch 5, a fixing hole 51 is formed on the side surface of the lock catch 5, a fixing column 92 is formed on the side surface of the positioning part 9, the positioning part 9 is connected to the lock catch 5 through the matching of the fixing column 92 and the fixing hole 51, a stop 11 is formed in the housing 1, the positioning part 9 forms a positioning end 91 extending towards the stop 11, the positioning end 91 is pressed against the stop 11, a positioning shaft 42 is formed on the contact support 4, the movable contact 7 is arranged on the positioning shaft 42 in a penetrating manner, a torsion spring 43, one end of the torsion spring 43 is connected in the arc-shaped groove 71, and the other end of the torsion spring 43 is connected to the contact support 4.

Claims (6)

1. The utility model provides a miniature circuit breaker, includes casing and the operating device of setting in the casing, operating device includes handle, U type connecting rod, contact support, hasp, jumps to detain, moving contact, the both ends of U type connecting rod are connected the handle respectively and are jumped to detain, jump to detain, hasp, moving contact all connect on the contact support, the hasp is connected with jumping to detain and is formed linkage cooperation, its characterized in that: be provided with the handle support on the handle, the handle support rotates along with the handle, forms the crimping piece on the handle support, the contact supports and forms the boss by one side of handle support, the formation linkage cooperation is connected to crimping piece and boss, and one side of hasp is provided with the setting element, form the dog in the casing, the setting element supports and presses on the dog, form the location axle in the contact support, the moving contact is worn to put on the location epaxially, the epaxial cover of location is equipped with the torsional spring, the one end of torsional spring is connected on the moving contact, and the other end of torsional spring is connected on the contact support.

2. A miniature circuit breaker according to claim 1, wherein: form the handle connecting axle on the casing, handle and handle supporting piece are all connected on the handle connecting axle, form the notch of certain angle on the handle, the crimping piece is located the notch.

3. A miniature circuit breaker according to claim 2, wherein: one side that the boss was kept away from to the crimping piece forms the end that resets, form the portion that resets on the notch, the end that resets is connected with the portion that resets and is formed the linkage.

4. A miniature circuit breaker according to claim 1, 2 or 3, wherein: an arc-shaped groove is formed on the movable contact, and one end of the torsion spring is connected in the arc-shaped groove.

5. A miniature circuit breaker according to claim 1, 2 or 3, wherein: the locating piece forms the location end that extends to the dog, the location end supports presses on the dog.

6. A miniature circuit breaker according to claim 5, wherein: the side of hasp forms the fixed orifices, and the side of setting element forms the fixed column, the setting element passes through the cooperation of fixed column and fixed orifices to be connected on the hasp.

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