Reset mechanism of dual-breakpoint breaker

Abstract

The invention provides a reset mechanism of a dual-breakpoint breaker. The reset mechanism comprises a U-type jump fastener, wherein two side arms of the jump fastener are rotatably arranged on the inner sides of two side plates. The jump fastener is matched with a transmission mechanism of a breaker and a releasing mechanism. The reset mechanism is characterized by further comprising a reset spring penetrating through a positioning shaft, the positioning shaft is fixed between the two side plates and comprises two torsion springs in a connected mode, the connecting portion of the two torsion springs serves as the fixing end of the reset spring and is limited on a fixing face, and two leg portions of the reset spring are connected with the two side arms of the jump fastener. According to the reset mechanism, the jump fastener and the reset spring are arranged in a non-coaxial mode, and the reset spring comprises the two torsion springs, so that the reset spring can be well matched with the two side walls of the jump fastener. On the condition that the reset mechanism works normally, pressure of a contact system is not increased, pull force of a main pull spring is not increased, and the break speed of a plastic shell type breaker is increased.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to a reset mechanism of a double break point circuit breaker. Background technique [0002] For the main mechanism of the existing molded case circuit breaker, it is generally composed of side plates, handle levers, upper connecting rods, lower connecting rods, jumpers, drawbars, lockers, positioning shafts and other components. Commonly known in the industry. Then, in the case of ensuring the normal operation of the main mechanism and limited space size (or increasing the contact pressure due to the reduction of the temperature rise of the circuit breaker), the breaking capacity and electrical life of the circuit breaker can be improved by accelerating the reset speed of the circuit breaker mechanism. Become the focus of expert research in the industry. [0003] The main factors affecting the breaking speed of the circuit breaker mechanism are as follows: the size...

AI Technical Summary

Problems solved by technology

Among them, the main tension spring provides the driving force for disconnecting the main mechanism, and the disconnection speed of the main mechanism can be increased by increasing the effective tension of the main tension spring. Force or manual operation, the operation is inconvenient. At the same time, the limited space size of the mechanism determines the limited pulling force; it is also possible to increase the restoring force of the jumper of the mechanism by reducing the pressure of the moving contact of the contact system, thereby improving the breaking force of the main mechanism. Opening speed, but the pressure of the contact system is too small, which will increase the temperature rise of the circuit breaker and reduce the electrical life of the circuit breaker

[0004] Chinese patent CN102034652A discloses an operating mechanism for a molded case circuit breaker, which includes a handle, a main tension spring, a latch, a re-clasp, an upper link, a lower link and a moving contact system, and also includes an accelerated breaking device, The accelerated breaking device includes a jumper (single board), a jumper rotation shaft, and an energy storage spring. The jumper is installed on the jumper rotation shaft for rotation, and one end of the energy storage spring is fixed and the other end is connected to the jumper. and the energy storage spring is a single torsion spring and is installed on the rotating shaft of the jumper. The rotation center of the energy storage spring is the same as that of the jumper. The energy storage spring is located on one side of the jumper. It shows the single break point molded case circuit breaker, its disadvantage is that: more parts are required, because the single break point molded case circuit breaker has a large space and is easy to realize, while the double break point molded case circuit breaker has relatively small space, and the realization tougher

A molded case circuit breaker from GE (General Electric) has an accelerated breaking mechanism, including a jumper (single plate), a U-shaped transmission lever, and a single torsion spring. The U-shaped transmission rod is connected to the handle lever, and the U The type transmission rod and the jumper share a rotating shaft to rotate around it. The single torsion spring is worn on the rotating shaft. In addition to the function of accelerating breaking, this structure can also provide a force to the handle lever to ensure that the handle lever can It is in the reset state; the rotation centers of the jumper, U-shaped transmission lever, and single torsion spring are concentric. The reset force of the fastener makes the breaking effect not obvious enough; and the structure is more complicated, the assembly is difficult, the cost is higher, and the production efficiency is lower

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