An electromagnetic tripping device with a tripping mechanism

Abstract

An electromagnetic tripping device with a tripping mechanism comprises a blade, a platy armature, a counterforce spring, a permanent magnet, a tripping coil and an ejector rod, wherein the blade is fixedly connected with a U-shaped iron core, the platy armature is installed on the blade in a turnover mode, the counterforce spring drives the platy armature to be separated from the U-shaped iron core so that tripping motion can be generated, the tripping coil is installed on the U-shaped iron core in a sleeving mode and enables the platy armature to be separated from the U-shaped iron core, and the ejector rod is used for transmitting the tripping motion; the tripping mechanism comprises a reset spring, a base and a buckle, the buckle is rotatably installed on the base through a revolute pair mechanism, and a buckle plate is installed on the base through a revolute pair and provided with a buckling surface, a drive surface B and a transmission surface A in running fit with the ejector rod. A tripping spring drives the buckle plate to be separated from the tripping mechanism. The locking surface of the buckle is in buckling or tripping fit with the buckling surface of the buckle plate, an elastic transmission portion of the buckle can make contact with or separate from the platy armature and the drive surface B of the buckle plate in a matched mode at the same time, the reset spring can drive the locking surface and the buckling surface to be buckled elastically, and abrasion and manufacturing process requirements are lowered.

Description

technical field [0001] The invention belongs to the field of low-voltage electrical appliance manufacturing, and in particular relates to a residual current operated circuit breaker, in particular to an electromagnetic tripping device for the residual current operated circuit breaker. Background technique [0002] The residual current operated circuit breaker is a low-voltage electrical appliance with a wide range of uses, and the electromagnetic tripping device is an important part of the residual current operated circuit breaker. Its function is to trigger the remaining The operating mechanism of the current-operated circuit breaker trips. The basic structure of the electromagnetic tripping device generally includes: a U-shaped iron core, the ends of the two arms of the iron core form two magnetic pole surfaces on the same plane; When in position, it presses on the surface of the above two magnetic poles to close the magnetic circuit formed by the iron core and the plate ...

AI Technical Summary

Problems solved by technology

The transmission between the electromagnetic tripping device and the operating mechanism of the circuit breaker in the above-mentioned prior art adopts a structure in which the ejector rod is directly connected to the plate-shaped armature, that is, one end of the ejector rod directly acts on the plate-shaped armature and transmits the driving force and action. The other end of the ejector rod is connected to the operating mechanism of the circuit breaker, and this transmission has the characteristics of large transmission force, unstable transmission and shock load, which pose a serious threat to the movement accuracy of the plate-shaped armature. while wreaking havoc on the precision of the contact surfaces between the plate armature and the U-shaped core

For this reason, the Chinese invention patent that the notification number is CN 1747097 discloses a kind of electromagnetic tripping device, and it is provided with a buffer spring between the reset pin (equivalent to the push rod) and the blade (equivalent to the plate armature), but Since the spring leaf is a transmission member arranged between the reset pin and the blade, it cannot change the magnitude of the force in the process of transmitting force, so the large and unstable driving force of the reset pin will still exert force on the armature (equivalent to U-shaped iron core) and the contact surface of the blade cause damage

Moreover, due to the mechanical requirements of the operating mechanism, the size of the driving force of the reset pin and its characteristic design cannot take into account the motion accuracy of the blades. Therefore, the above-mentioned prior art causes the electromagnetic tripping device to malfunction due to the wear or instability of the air gap. , the problem of declining reliability is still very prominent

In addition, due to the large line travel of the tripping action of the ejector rod, in the structure of direct transmission between the ejector rod and the plate-shaped armature in the prior art, the stroke (angular travel) of the flipping action of the plate-shaped armature must be designed to be very large, otherwise it cannot meet the requirements. The stroke requirement of the tripping action, and the large stroke requirement of the flip action of the plate armature, not only increases the manufacturing difficulty for improving the action accuracy of the plate armature, but also increases the impact degree of the flip action on the contact surface, making the plate armature Action accuracy and contact surfaces are prone to damage and failure

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