KR-102964837-B1 - ELECTRONIC OVERLOAD RELAY

KR102964837B1KR 102964837 B1KR102964837 B1KR 102964837B1KR-102964837-B1

Abstract

In order to achieve cost reduction and miniaturization by reducing the number of components used for switching a contact mechanism, an electronic overload relay according to one embodiment comprises a contact mechanism capable of switching between a normal state and a trip state, an electromagnet having a movable axis that moves axially when energized, a slider that moves axially in conjunction with the movable axis when energized, and a driven member that alternately switches the stop position after the slider moves axially between a first stop position corresponding to the normal state and a second stop position corresponding to the trip state whenever the electromagnet is energized.

Inventors

다카하시 시오리
이시바시 고스케
오노기 유마
고치 아키오

Assignees

후지 덴키 가부시키가이샤
후지 덴키 기기세이교 가부시끼가이샤

Dates

Publication Date: 20260513
Application Date: 20230222
Priority Date: 20220323

Claims (6)

A contact mechanism capable of switching between a normal state and a trip state, and An electromagnet having a movable axis that moves axially when energized, and A slider that moves in the axial direction in conjunction with the movable shaft when the above current is applied, and The driven member includes a stop position that alternately switches between a first stop position corresponding to the normal state and a second stop position corresponding to the trip state, after the slider moves in a predetermined axial direction whenever the electromagnet is energized. When the stop position of the slider is the first stop position, if current is applied to the electromagnet, the slider moves in the predetermined direction along the axial direction, and An electronic overload relay characterized in that when the stop position of the slider is the second stop position, and current is applied to the electromagnet, the slider moves in the predetermined direction along the axial direction.
In paragraph 1, The above slider is provided with a cam groove constituting a heart cam mechanism, and The above-mentioned driven member is, The tip portion is provided with a hook portion constituting the heart cam mechanism, An electronic overload relay characterized by alternately switching the stop position after the slider moves in the axial direction between the first stop position and the second stop position by the hook portion driving in the cam groove whenever the electromagnet is energized.
In paragraph 2, An electronic overload relay characterized by including a manual reset mechanism for manually returning the contact mechanism from the tripped state to the normal state.
In paragraph 3, An electronic overload relay characterized by including a detection means for detecting the stop position of the slider in the above axial direction.
In paragraph 4, The above manual reset mechanism is, It is equipped with a reset button, An electronic overload relay characterized by manually returning the contact mechanism by moving the slider in the axial direction in conjunction with the operation of pressing the reset button, thereby switching the stop position of the slider from the second stop position to the first stop position.
In paragraph 5, The above manual reset mechanism is an electronic overload relay characterized by including a conversion means that converts the axial movement force of the reset button accompanying the pressing operation into the axial movement force of the slider.

Description

Electronic Overload Relay The present invention relates to an electronic overload relay. Patent Document 1 below discloses an electronic overload relay configured to switch a contact mechanism between a trip position and a reset position using a permanent magnet and a coil that generate magnetic flux. FIG. 1 is a front view perspective view of an electronic overload relay according to one embodiment. FIG. 2 is a perspective view of the exterior of an electronic overload relay according to one embodiment, viewed from the bottom side. FIG. 3 is an exploded perspective view of an electronic overload relay according to one embodiment, viewed from the bottom side. FIGS. 4a and 4b are drawings showing the configuration of a contact switching mechanism equipped with an electronic overload relay according to one embodiment. FIG. 5 is an external perspective view of a slider equipped with a contact switching mechanism according to one embodiment. FIGS. 6a and 6b are drawings showing the configuration of a heart cam mechanism equipped with a contact switching mechanism according to one embodiment. FIGS. 7a and FIGS. 7b are drawings for explaining the operation of a contact switching mechanism according to one embodiment. FIGS. 8a and FIGS. 8b are drawings for explaining the operation of a contact switching mechanism according to one embodiment. FIGS. 9a and 9b are drawings for explaining the operation of a contact switching mechanism according to one embodiment. FIGS. 10a and FIGS. 10b are drawings for explaining the operation of a contact switching mechanism according to one embodiment. FIG. 11 is an external perspective view of a position sensor equipped with a contact switching mechanism according to one embodiment. FIGS. 12a and FIGS. 12b are the positions of a slider by a position sensor provided by a contact switching mechanism according to one embodiment. Hereinafter, an embodiment will be described with reference to the drawings. (Schematic configuration of the electronic overload relay (10)) FIG. 1 is an external perspective view of an electronic overload relay (10) according to one embodiment, viewed from the front (X-axis (+) side). FIG. 2 is an external perspective view of an electronic overload relay (10) according to one embodiment, viewed from the bottom (Z-axis (-) side). FIG. 3 is an exploded perspective view of an electronic overload relay (10) according to one embodiment, viewed from the bottom (X-axis (-) side). Meanwhile, for the purposes of the following description, the X-axis direction is referred to as the front-back direction, the Y-axis direction as the left-right direction, and the Z-axis direction as the up-down direction. However, the positive (+) direction of the X-axis is referred to as the front, the two directions of the Y-axis as the left, and the two directions of the Z-axis as the up. For example, an electronic overload relay (10) is used by connecting it to a motor (not shown) and an electromagnetic contactor (not shown) provided in the motor's load circuit for the purpose of preventing damage to the motor due to the motor's overload condition continuing. The electronic overload relay (10) has a trip function in which the contact mechanism (20, see FIG. 4a and FIG. 4b) is switched to a trip state when an overcurrent flows through the load, a manual return function in which the contact mechanism (20) is manually returned from the trip state to a normal state, and an automatic return function in which the contact mechanism (20) is automatically returned from the trip state to a normal state after a predetermined time has elapsed. For example, the electronic overload relay (10) detects the load current of the motor by the overcurrent detector (15), and when the detected load current exceeds a set value, it causes a driving current to flow from the overcurrent detector (15) to the electromagnet (101) to drive the electromagnet (101), thereby performing a tripping operation to switch the contact mechanism (20) to a tripped state. Specifically, in the electronic overload relay (10), when the overcurrent detector (15) detects the load current of the motor, the control circuit (13) is driven by the load current, and the control circuit (13) detects, determines, and issues a command for the load current. The electronic overload relay (10) can cut off the load circuit of the motor by transmitting a first state signal to the electromagnetic contactor when the contact mechanism (20) is in a tripped state, thereby causing the electromagnetic contactor to perform a cutoff operation. After that, the electronic overload relay (10) performs an automatic reset operation to switch the contact mechanism (20) to a normal state by allowing driving current to flow to the electromagnet (101) by means of an automatic reset function when a predetermined time has elapsed. Alternatively, the electronic overload relay (10) performs a manual reset operation by mechanically switching the contact mechanism (20)