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EP-4060710-B1 - TRIP DEVICE

EP4060710B1EP 4060710 B1EP4060710 B1EP 4060710B1EP-4060710-B1

Inventors

  • OH, KYUNGHWAN
  • OH, Kihwan
  • KIM, YOUNGHWAN
  • LIM, Jeongjae
  • LEE, YONGHUN

Dates

Publication Date
20260513
Application Date
20200409

Claims (13)

  1. A trip device comprising: a frame (100); a shooter assembly (300) rotatably coupled to the frame (100); and an adjustment crossbar (500) rotatably coupled to the frame (100) and configured to be brought into contact with or separated from the shooter assembly (300), wherein the adjustment crossbar (500) comprises: a fixed crossbar (700) extending in one direction, the shooter assembly (300) brought into contact with the fixed crossbar (700); and wherein the shooter assembly (300) is configured to extend toward the fixed crossbar (700) to cover the fixed crossbar (700), and wherein the fixed crossbar (700) comprises a shooter support portion (760) protruding toward the shooter assembly (300), such that the shooter assembly (300) is seated thereon, such that a contact portion between the shooter assembly (300) and the shooter support portion (760) does not move along a longitudinal direction of the fixed crossbar (700), characterized in that the adjustment crossbar (500) further comprises a movable crossbar (600) extending in the one direction and slidably coupled to the fixed crossbar (700) in the one direction, and
  2. The trip device of claim 1, wherein the fixed crossbar (700) comprises an insertion space (740) recessed into one side thereof facing the movable crossbar (600), and wherein the movable crossbar (600) comprises an insertion protrusion (650) protruding from one side thereof facing the fixed crossbar (700), and inserted into the insertion space (740).
  3. The trip device of claim 2, wherein the insertion space (740) extends by a predetermined distance in the one direction, and wherein the insertion protrusion (650) is inserted into the insertion space (740) so as to be slidable in the one direction.
  4. The trip device of claim 3, wherein the insertion space (740) is provided in plurality disposed to be spaced apart from one another by predetermined distances, and wherein the insertion protrusion (650) is provided in plurality to be inserted into the insertion spaces (740), respectively.
  5. The trip device of claim 1, wherein the frame (100) defines a predetermined space therein, and wherein the predetermined space accommodates therein: a heater (210) electrically connected to an outside; and a bimetal (400) located adjacent to the heater (210) and configured to be curved toward the adjustment crossbar (500) by heat generated in the heater (210).
  6. The trip device of claim 5, wherein the movable crossbar (600) comprises a distance adjustment bar (630) extending by a predetermined length in a direction toward the bimetal (400).
  7. The trip device of claim 6, wherein the bimetal (400) is formed to be inclined along the one direction in which the movable crossbar (600) extends, such that a distance between the bimetal (400) and an end portion of the distance adjustment bar (630) facing the bimetal (400) is adjusted as the movable crossbar (600) is slid in the one direction.
  8. The trip device of claim 1, wherein the frame (100) defines a predetermined space therein, and wherein the predetermined space accommodates therein: a heater (210) electrically connected to an outside; and a magnet (220) located adjacent to the heater (210) and configured to be magnetized by an electric field formed by a current flowing through the heater (210); and an armature (230) located adjacent to the magnet (220) and rotatably coupled to the frame (100).
  9. The trip device of claim 8, wherein the armature (230) presses the adjustment crossbar (500) to rotate the adjustment crossbar (500) in a direction away from the shooter assembly (300) when the armature (230) is in contact with the adjustment crossbar (500) and rotates toward the magnet (220) by a magnetic force formed by the magnetized magnet (220).
  10. The trip device of claim 9, wherein the armature (230) comprises an armature rotation shaft (231) rotatably coupled to the frame (100), and wherein the armature rotation shaft (231) is located between the magnet (220) and the adjustment crossbar (500).
  11. The trip device of claim 9, wherein the fixed crossbar (700) comprises a pushed protrusion (730) protruding from one side thereof to be away from the predetermined space of the frame (100), and wherein the armature (230) has one end portion facing the adjustment crossbar (500) located adjacent to the pushed protrusion (730).
  12. The trip device of claim 1, wherein the fixed crossbar (700) comprises a rotation shaft (720) disposed to protrude from both end portions in a direction in which the fixed crossbar (700) extends, and rotatably coupled to the frame (100).
  13. The trip device of claim 1, wherein an elastic member is disposed below the shooter assembly (300) to elastically support the shooter assembly (300), and wherein the shooter assembly (300) is rotated toward the elastic member when the fixed crossbar (700) is rotated.

Description

Technical Field The present disclosure relates to a trip device, and more particularly, to a trip device capable of precisely adjusting a trip section and preventing interference by other members when adjusting the trip section. Background Art A Molded Case Circuit Breaker (MCCB) is provided on a wiring to automatically break a circuit when an electrical overload condition or a short-circuit accident occurs. Accordingly, damages on circuits and loads connected to the wiring due to an electrical accident can be prevented. The MCCB has a trip assembly (or trip device). The trip device performs a trip operation of the opening/closing mechanism when the overload condition or a short-circuit accident occurs. The trip device is movably coupled to the MCCB. The trip device is coupled to a movable contactor, so that the movable contactor can move together with the trip device. When the trip device moves, the movable contactor is brought into contact with or separated from a fixed contactor. Accordingly, the MCCB may be electrically connected to or disconnected from outside. Referring to FIG. 1, a trip device 1000 according to the related art includes a trip device case 1100, a crossbar 1200, a bimetal 1300, a shooter 1400, and a knob 1500. When a fault current (large current) flows into the MCCB along a heater 1130, electromagnetic force is generated in a magnet 1120. Accordingly, an armature 1110 is attracted toward the magnet 1120, and one end thereof presses a pushed protrusion 1220 of the crossbar 1200. In response to this, the crossbar 1200 is rotated to release a contact state between a shooter contact portion 1240 and the shooter 1400. The shooter 1400 is then rotated so that the fixed contactor and the movable contactor are spaced apart from each other. When an overcurrent (small current) flows into the MCCB along the heater 1130, the bimetal 1300 is curved to press a gap adjusting portion 1210 coupled to the crossbar 1200. Accordingly, the crossbar 1200 is rotated clockwise in the illustrated implementation, and the contact state between the shooter contact portion 1240 and the shooter 1400 is released. The shooter 1400 is then rotated so that the fixed contactor and the movable contactor are spaced apart from each other. As described above, the MCCB may perform a trip operation when both the large current and the small current flow. Therefore, in the MCCB, it is needed to set a magnitude of current to be blocked. Referring to FIG. 2, a trip device 1000 according to the related art includes a knob 1500. The knob 1500 includes a knob adjusting unit 1500 that extends toward the crossbar 1200. The knob adjusting unit 1500 may be coupled to a knob connecting portion 1230 of the crossbar 1200. The knob 1500 is rotatably coupled to the trip device case 1100. When the knob 1500 is rotated, the crossbar 1200 connected to the knob connection portion 1230 is moved to one side or another side in the extending direction of the crossbar 1200 connected to the knob connecting portion 1230. At this time, one side surface of the bimetal 1300 facing the gap adjusting portion 1210 is inclined along the direction. Accordingly, a distance between the bimetal 1300 and the gap adjusting portion 1210 can be adjusted according to a position of the gap adjusting portion 1210 in the direction. However, the crossbar 1200 is moved while the shooter contact portion 1240 and the shooter 1400 are in contact with each other. Accordingly, when the crossbar 1200 is moved, friction may be caused between the shooter contact portion 1240 and the shooter 1400. This may cause jamming between the shooter contact portion 1240 and the shooter 1400 when the crossbar 1200 is moved in the extending direction. As a result, even when the bimetal 1300 is not curved, there may be a risk that the shooter 1400 arbitrarily performs a trip operation due to the jam. In addition, a pin made of a conductive material is inserted into the crossbar 1200. Considering that the crossbar 1200 extends along each heater 1130, electrical interference may be caused between phases due to the pin. Korean Patent Publication No. 10-2017-0076870 discloses an MCCB. Specifically, the prior art document discloses an MCCB that includes a stopping ring for preventing a sliding motion of a crossbar. However, the prior art document has a limitation in that it does not suggest a method for preventing friction between the crossbar and a shooter. Korean Patent Publication No. 10-2017-0081870 discloses an MCCB. Specifically, the prior art document discloses an MCCB capable of excluding a knob and the like by fixing an adjustment member. However, the prior art document has a limitation in that there is no consideration of a method for preventing friction between a crossbar and a shooter. Moreover, those prior art documents do not suggest a method for preventing electrical interference occurred in each phase by a conductive pin disposed in a crossbar. Korea Patent Publication No. 10-2017-00