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US 8,274,347 B2Granted
Electromagnetic switch
AssigneeLS Industrial Systems Co., Ltd.
InventorYoung Hwan Eum
Life of this patent
Estimating the term…
Abstract
Disclosed is an electromagnetic switch, in which an arc protection member is installed in an extinguishing chamber for housing stationary electrodes and a movable contact arm, thereby protecting internal components including an upper yoke from damages caused due to arc, which is generated immediately when the movable contact arm is separated from the stationary electrodes, resulting in improvement of operation reliability as well as increase in a lifespan of the electromagnetic switch.
Claims9
An electromagnetic switch comprising:
- stationary electrodes fixed to an outer case;
- a movable contact arm contactable with or separable from the stationary electrodes;
- a shaft having an upper end fixed to the movable contact arm;
- a movable core attached to a lower portion of the shaft;
- a stationary core configured to wrap the shaft at a position facing the movable core;
- an excitation winding that is wound on the movable core and the stationary core;
- an upper yoke and a lower yoke configured to shield the excitation winding to form a flow path of a magnetic flux with the movable core and the stationary core;
- an arc protection member located between the movable contact arm and the upper yoke to shield the shaft for protection;
- and
- a wipe spring located between the movable contact arm and the upper yoke to maintain contact pressure between the movable contact arm and the stationary electrodes, wherein the arc protection member is installed to wrap the wipe spring;
- a first arc protection shield contacting a lower surface of the movable contact arm;
- and
- a second arc protection shield detachably coupled to the first arc protection shield and configured to shield an upper surface of the upper yoke;
- and
- an auxiliary spring located within the arc protection member and configured to press the arc protection member toward the movable contact arm.
12 more elements
An electromagnetic switch comprising:
- stationary electrodes fixed to an outer case;
- a movable contact arm contactable with or separable from the stationary electrodes;
- a shaft having an upper end fixed to the movable contact arm;
- a movable core attached to a lower portion of the shaft;
- a stationary core configured to wrap the shaft at a position facing the movable core:
- an excitation winding that is wound on the movable core and the stationary core;
- an upper yoke and a lower yoke configured to shield the excitation winding to form a flow path of a magnetic flux with the movable core and the stationary core;
- an arc protection member located between the movable contact arm and the upper yoke to shield the shaft for protection;
- and
- a wipe spring located between the movable contact arm and the upper yoke to maintain contact pressure between the movable contact arm and the stationary electrodes,
- wherein:
- the arc protection member is installed to wrap the wipe spring and comprises:
- a yoke protection portion configured to shield an upper surface of the upper yoke,
- an outer protection portion upwardly protruding from an edge of the yoke protection portion by a first predetermined height, and
- an inner protection portion upwardly protruding from a central portion of the yoke protection portion by a second predetermined height, wherein the inner protection portion is flexible such that a length of the inner protection portion is variable in response to an upward movement or a downward movement of the movable contact arm;
- the inner protection portion comprises an upper end fixed to a lower surface of the movable contact arm;
- and
- the inner protection portion is in a form of a flexible tube.
15 more elements
Dependencies are inferred from the claim text.