CN112435898A

CN112435898A - Safety protection structure of plug-in molded case circuit breaker

Info

Publication number: CN112435898A
Application number: CN202011381204.6A
Authority: CN
Inventors: 施林康; 吴洋涛; 高杰
Original assignee: Legrand Low Voltage Appliance Wuxi Co ltd
Current assignee: Legrand Low Voltage Appliance Wuxi Co ltd; Legrand Low Voltage Wuxi Co Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-03-02

Abstract

The invention relates to a safety protection structure of a plug-in molded case circuit breaker, which comprises a circuit breaker shell and a draw bar, wherein a shell is fixed below the circuit breaker shell, a connecting rod is arranged in the shell in a sliding manner, a return spring is arranged between the shell and the connecting rod, a push rod is arranged above the shell, the push rod is arranged in the circuit breaker shell in a sliding manner, a clamping structure is arranged between the push rod and the connecting rod, a draw bar blocking platform is arranged at the upper part of the push rod, the draw bar is positioned at one side of the. The invention has novel structure and unique design; the installation is simple, and the function is practical; the potential safety hazard of live operation of operators is avoided, and the normal work of the plug-in circuit breaker is not influenced.

Description

Safety protection structure of plug-in molded case circuit breaker

Technical Field

The invention belongs to the technical field of circuit breakers, and relates to a safety protection structure of a plug-in molded case circuit breaker.

Background

Most of the existing plug-in circuit breakers have no safety protection structure between the circuit breaker body and the plug-in base, and the circuit breaker body can be inserted and pulled out randomly when the molded case circuit breaker is in a tripping state, a switching-off state and a switching-on state; this in circuit breaker practical application process, for plug-in circuit breaker operating personnel, this has very big live working potential safety hazard.

Disclosure of Invention

The invention aims to provide a safety protection structure of an insertion type molded case circuit breaker, which is characterized in that on one hand, if and only if an operator operates a circuit breaker body in a tripping state, the operator can perform insertion operation on the insertion type circuit breaker; finally, the insertion operation of the plug-in circuit breaker can be carried out by an operator if and only if the circuit breaker body is in a safe tripping state. On the other hand, when an operator pulls out the plug-in circuit breaker, the circuit breaker can automatically trip and open the brake to cut off the circuit; the potential safety hazard of live-line operation of operators is avoided.

According to the technical scheme provided by the invention: the utility model provides a plug-in moulded case circuit breaker's safety protection structure, includes circuit breaker casing and traction lever, circuit breaker casing below installation shell, it sets up the connecting rod to slide in the shell, the shell with be equipped with reset spring between the connecting rod, the shell top is equipped with the push rod, the push rod slide set up in the circuit breaker casing, the push rod with be equipped with the joint structure between the connecting rod, push rod upper portion is equipped with traction lever fender platform, the traction lever is located push rod one side, the traction lever middle part articulate in the circuit breaker casing.

As a further improvement of the invention, a connecting rod cavity is arranged in the shell, and guide grooves are formed in two sides of the shell.

As a further improvement of the invention, the connecting rod is provided with guide flanges on both sides.

As a further improvement of the invention, the upper end of the return spring is propped against the top of the connecting rod cavity, and the lower end of the return spring is propped against the top of the connecting rod.

As a further improvement of the invention, the return springs are symmetrically arranged.

As a further improvement of the invention, the clamping structure comprises a barb claw and a barb groove.

As a further improvement of the invention, the barb claw is arranged at the bottom of the push rod, and a deformation notch is formed in the barb claw; the barb slot is located at the top of the connecting rod.

The positive progress effect of this application lies in:

the invention has novel structure and unique design; the installation is simple, and the function is practical; the potential safety hazard of live operation of operators is avoided, and the normal work of the plug-in circuit breaker is not influenced.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an enlarged schematic view of a region D in fig. 1.

Fig. 3 is an enlarged schematic view of region E in fig. 1.

FIG. 4 is a schematic view of an assembly structure of the connecting rod, the housing and the push rod of the present invention.

FIG. 5 is an exploded view of the connecting rod, housing and push rod of the present invention.

Fig. 6 is a cross-sectional view of the link engaged with the pushrod of the present invention.

Fig. 7 is a schematic structural view of the installation in use of the present invention.

Detailed Description

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

Fig. 1 to 7 include a link 1, a return spring 2, a case 3, a push rod 4, a breaker case 5, a draw bar 6, a breaker base 7, and the like.

As shown in fig. 1-6, the invention is a safety protection structure of a plug-in molded case circuit breaker, comprising a circuit breaker housing 5 and a draw bar 6, wherein a shell 3 is installed below the circuit breaker housing 5, a connecting rod 1 is arranged in the shell 3 in a sliding manner, a return spring 2 is arranged between the shell 3 and the connecting rod 1, a push rod 4 is arranged above the shell 3, the push rod 4 is arranged in the circuit breaker housing 5 in a sliding manner, a clamping structure is arranged between the push rod 4 and the connecting rod 1, a draw bar blocking platform 4-1 is arranged at the upper part of the push rod 4, the draw bar 6 is positioned at one side of the push rod.

As shown in fig. 5, a link cavity is formed in the housing 3 for accommodating the link 1, and guide grooves 3-1 are formed at both sides of the housing 3.

The two sides of the connecting rod 1 are provided with guide flanges 1-1, and the guide flanges 1-1 are matched with the guide grooves 3-1 in size.

The shell 3 is made of plastic material, and has certain elasticity due to the connecting rod cavity. And (3) plugging the connecting rod 1 into the shell 3 until the guide flange 1-1 is clamped into the guide groove 3-1, thereby completing the guide and the limit of the connecting rod 1 in the shell 3.

Reset spring 2 sets up for the symmetry, and 2 upper ends of reset spring support the connecting rod chamber top, and 2 lower extremes of reset spring support connecting rod 1 both sides tops, and reset spring 2 gives connecting rod 1 decurrent pretightning force, makes it under the condition that does not receive the exogenic action, lies in the lower part in 3 connecting rod chambers of shell all the time.

As shown in figure 6, the clamping structure comprises a barb claw 4-2 and a barb groove 1-2, the barb claw 4-2 is arranged at the bottom of a push rod 4, and a deformation notch 4-3 is formed in the barb claw 4-2. The barb groove 1-2 is located at the top of the connecting rod 1.

The working process of the invention is as follows:

as shown in fig. 1, a shell 3 is arranged below a breaker shell 5, a pull rod 1 is pressed through external force, barb grooves 1-2 on the pull rod 1 contact barb claws 4-2, and due to the existence of deformed notch openings 4-3, the barb claws 4-2 firstly contract into the barb grooves 1-2 and are clamped in the barb grooves 1-2, and the barb grooves 1-2 are meshed with each other; under the drive of the return spring 2, the meshed pull rod 1 and the meshed push rod 4 move downwards along the ejector rod cavity, so that the pull rod blocking platform 4-1 limits the rotation of the pull rod 6, as shown in fig. 3, the pull rod 6 cannot rotate anticlockwise, the circuit breaker cannot be buckled, closed and opened again, and a product is always kept in a tripping state. Finally, the insertion operation of the plug-in circuit breaker can be carried out by an operator if and only if the circuit breaker body is in a safe tripping state.

As shown in fig. 7, a boss 7-1 is arranged at the upper part of an insertion type circuit breaker base 7, the boss 7-1 of the circuit breaker base props against the bottom of a connecting rod 1, so that the circuit breaker base overcomes the force of a reset spring, the meshed connecting rod 1 and a push rod 4 are driven to move upwards along a push rod cavity, a draw rod stop 4-1 moves to the upper part of a draw rod 6, the draw rod can normally rotate, and the circuit breaker can carry out normal operations such as re-buckling, closing, brake opening and tripping, namely, a product enters a normal working state.

When the breaker body in a normal working state is pulled out and separated from the plug-in breaker base 7, the boss 7-1 of the breaker base is separated from the bottom of the connecting rod 1, the meshed pull rod 1 and the push rod 4 move downwards along the ejector rod cavity under the driving of the return spring 2, so that the traction rod baffle table 4-1 which is originally positioned above the traction rod 6 starts to contact the traction rod 6 until the traction rod 6 rotates around the center to enable the breaker body to be tripped and separated. Finally, when the operation of pulling out the plug-in circuit breaker by an operator is realized, the circuit breaker can automatically trip and open the brake to cut off the circuit, and the potential safety hazard of live operation of the operator is avoided.

Claims

1. The utility model provides a plug-in moulded case circuit breaker's safety protection structure which characterized in that: the structure includes circuit breaker casing (5) and traction lever (6), circuit breaker casing (5) below installation shell (3), it sets up connecting rod (1) to slide in shell (3), shell (3) with be equipped with reset spring (2) between connecting rod (1), shell (3) top is equipped with push rod (4), push rod (4) slide set up in circuit breaker casing (5), push rod (4) with be equipped with the joint structure between connecting rod (1), push rod (4) upper portion is equipped with traction lever fender platform (4-1), traction lever (6) are located push rod (4) one side, traction lever (6) middle part articulate in circuit breaker casing (5).

2. The safety protection structure of the insertion-type molded case circuit breaker of claim 1, wherein: a connecting rod cavity is arranged in the shell (3), and guide grooves (3-1) are formed in two sides of the shell (3).

3. The safety protection structure of the insertion-type molded case circuit breaker of claim 2, wherein: guide flanges (1-1) are arranged on two sides of the connecting rod (1).

4. The safety protection structure of the insertion-type molded case circuit breaker of claim 1, wherein: the upper end of the reset spring (2) is propped against the top of the connecting rod cavity, and the lower end of the reset spring is propped against the top of the connecting rod (1).

5. The safety protection structure of the insertion-type molded case circuit breaker of claim 1, wherein: the return springs (2) are symmetrically arranged.

6. The safety protection structure of the insertion-type molded case circuit breaker of claim 1, wherein: the clamping structure comprises barb claws (4-2) and barb grooves (1-2).

7. The safety protection structure of the plug-in type molded case circuit breaker of claim 6, wherein: the barb claw (4-2) is arranged at the bottom of the push rod (4), and a deformation notch (4-3) is formed in the barb claw (4-2); the barb groove (1-2) is positioned at the top of the connecting rod (1).