US-12626877-B2 - Movable contact part and direct current relay comprising same

US12626877B2US 12626877 B2US12626877 B2US 12626877B2US-12626877-B2

Abstract

Disclosed are a movable contact part and a direct current relay comprising the same. The movable contact part, according to one embodiment of the present disclosure, comprises a coupling part which is provided to each component. The coupling part provided to each component is coupled to the coupling part provided to another adjacently positioned component. Thus, a coupled state between each of the components constituting the movable contact part may be easily and stably formed.

Inventors

Jung Woo Yoo

Assignees

LS ELECTRIC CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20211102
Priority Date: 20201104

Claims (19)

1 . A movable contact part, comprising: a movable contact which is in contact with or spaced apart from a fixed contact; an upper yoke which is located on a first side of the movable contact, covers a portion of the movable contact and forms a magnetic force, the upper yoke comprising: a cover part, extending in a length direction from a first end to a second end, opposite to the first end, and in a width direction, orthogonal to the length direction, from a first face to a second face; a first arm part, coupled to the first end of the cover part and extending in a height direction, orthogonal to the length direction and to the width direction; and a second arm part, coupled to the second end of the cover part and extending in the height direction; wherein the cover part defines a plurality of upper grooves spaced apart from one another along the length direction that are defined on a first surface of the cover part that faces the movable contact; and a shaft holder which is positioned between the movable contact and the upper yoke, the shaft holder comprising: a horizontal part, extending in the length direction between a first end and a second end; a first extension portion, coupled to the first end of the horizontal part and extending in the height direction; and a second extension portion, coupled to the second end of the horizontal part, opposite to the first end of the horizontal part, extending in the height direction; wherein the horizontal part defines a plurality of holder protrusions that each protrude from a first surface of the horizontal part and is each inserted into a corresponding upper groove of the plurality of upper grooves; wherein each upper groove of the plurality of upper grooves extends for a first distance in the height direction into the cover part from the first surface of the cover part less than a thickness of the cover part between the first surface of the cover part and a second surface of the cover part opposite to the first surface of the cover part.
2 . The movable contact part of claim 1 , wherein each upper groove of the plurality of upper grooves and each holder protrusion of the plurality of holder protrusions is formed to have a circular cross-section.
3 . The movable contact part of claim 1 , wherein each upper groove of the plurality of upper grooves and each holder protrusion of the plurality of holder protrusions is formed to have a polygonal cross-section.
4 . The movable contact part of claim 1 , wherein the plurality of upper grooves is arranged symmetrically with respect to a center of the upper yoke with respect to the length direction and the width direction.
5 . The movable contact part of claim 1 , wherein the plurality of upper grooves is arranged asymmetrically with respect to a center of the upper yoke with respect to the length direction and the width direction.
6 . The movable contact part of claim 1 , wherein the horizontal part defines a holder groove on a second surface of the horizontal part, opposite to the first surface of the horizontal part, wherein the second surface faces the movable contact, and wherein the movable contact comprises a contact protrusion which is formed to protrude from a first surface that faces the shaft holder and is inserted into the holder groove.
7 . The movable contact part of claim 6 , wherein the holder groove and the contact protrusion are each formed to have a circular cross-section.
8 . The movable contact part of claim 6 , wherein the holder groove and the contact protrusion are each formed to have a polygonal cross-section.
9 . The movable contact part of claim 6 , wherein the holder groove is one of a plurality of holder grooves that are spaced apart from each other, and wherein the contact protrusion is one of a plurality of contact protrusions that are spaced apart from each other and disposed to correspond to positions of respective holder grooves of the plurality of holder grooves.
10 . The movable contact part of claim 9 , wherein the plurality of holder grooves are arranged symmetrically with respect to a center of the horizontal part with respect to the length direction and the width direction.
11 . The movable contact part of claim 9 , wherein the plurality of holder grooves are arranged asymmetrically with respect to a center of the movable contact with respect to the length direction and the width direction.
12 . The movable contact part of claim 1 , further comprising: a lower yoke which is located on the second side of the movable contact, opposite to the first side of the movable contact, that supports the movable contact and forms a second magnetic force, wherein the movable contact defines a contact groove which is formed to be recessed on a surface on the second side of the movable contact that faces the lower yoke, and wherein the lower yoke comprises a lower protrusion which is formed to protrude from a first surface that faces the movable contact and is inserted into the contact groove.
13 . The movable contact part of claim 12 , wherein the contact groove and the lower protrusion are each formed to have a circular or polygonal cross-section.
14 . The movable contact part of claim 12 , wherein the contact groove is one of a plurality of contact grooves that are spaced apart from each other, and wherein the lower protrusion is one of a plurality of lower protrusions that are spaced apart from each other and disposed to correspond to positions of respective contact grooves of the plurality of contact grooves.
15 . The movable contact part of claim 14 , wherein the plurality of contact grooves is arranged symmetrically with respect to a center of the lower yoke with respect to the length direction and the width direction.
16 . The movable contact part of claim 14 , wherein the plurality of contact grooves is arranged asymmetrically with respect to a center of the lower yoke with respect to the length direction and the width direction.
17 . A direct current relay, comprising: a fixed contact which is energized with an external power source or load; and a movable contact part which is located below the fixed contact and moves in a direction toward the fixed contact and in a direction opposite to the fixed contact, wherein the movable contact part comprises: a movable contact which is in contact with or spaced apart from the fixed contact, and formed to have a length in a first direction that is longer than a width in a second direction orthogonal to the first direction; an upper yoke which is located on a first side of the movable contact and covers the movable contact, the upper yoke comprising: a cover part, extending in the second direction from a first end to a second end, opposite to the first end, and in the first direction from a first face to a second face, wherein the cover part defines an upper groove on a first surface of the cover part that faces the movable contact; a first arm part, coupled to the first end of the cover part and extending in a third direction, orthogonal to the first direction and to the second direction; and a second arm part, coupled to the second end of the cover part and extending in the third direction; a shaft holder which is positioned between the upper yoke and the movable contact, and covers the movable contact, the shaft holder comprising: a horizontal part, extending in the first direction between a first end and a second end, wherein the horizontal part defines a holder protrusion that protrudes from a first surface of the horizontal part and is each inserted into the upper groove; a first extension portion, coupled to the first end of the horizontal part and extending in the third direction; and a second extension portion, coupled to the second end of the horizontal part, opposite to the first end of the horizontal part, extending in the third direction; and a lower yoke which supports the movable contact from a second side of the movable contact, opposite to the first side of the movable contact, wherein the upper yoke and the lower yoke respectively form a magnetic force that attenuates an electromagnetic repulsive force generated between the fixed contact and the movable contact; wherein each upper groove of the plurality of upper grooves extends for a first distance in the height direction into the cover part from the first surface of the cover part less than a thickness of the cover part between the first surface of the cover part and a second surface of the cover part opposite to the first surface of the cover part.
18 . The direct current relay of claim 17 , wherein the horizontal part of the shaft holder defines a holder groove on a surface that faces the movable contact, and wherein the movable contact defines a contact protrusion that protrudes from a surface facing the shaft holder and is inserted into the holder groove.
19 . A movable contact part, comprising: a movable contact which is in contact with or spaced apart from a fixed contact; an upper yoke which is located on a first side of the movable contact, covers a portion of the movable contact and forms a magnetic force, the upper yoke comprising: a cover part extending in a first direction between a first end and a second end; a first arm part, coupled to the first end of the cover part and extending in a second direction, orthogonal to the first direction; and a second arm part, coupled to the second end of the cover part, opposite to the first end of the cover part, extending in the second direction; wherein the cover part defines: an upper groove which is formed to be recessed on a first surface of the cover part that faces the movable contact; an upper through-hole defined between the first surface of the cover part and a second surface of the cover part, opposite to the first surface; and a shaft holder which is positioned between the movable contact and the upper yoke, comprising: a horizontal part, extending in the first direction between a first end and a second end; a first extension portion, coupled to the first end of the horizontal part and extending in the second direction; and a second extension portion, coupled to the second end of the horizontal part, opposite to the first end of the horizontal part, extending in the second direction; wherein the horizontal part defines: a holder protrusion that protrudes from a first surface of the horizontal part that faces the upper yoke and is inserted into the upper groove; and a holder through-hole defined between the first surface of the horizontal part and a second surface of the horizontal part, opposite to the first surface; and a support rod is penetratingly coupled to the upper yoke and the shaft holder through the upper through-hole and the holder through-hole; wherein each upper groove of the plurality of upper grooves extends for a first distance in the height direction into the cover part from the first surface of the cover part less than a thickness of the cover part between the first surface of the cover part and a second surface of the cover part opposite to the first surface of the cover part.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is a National Stage of International Application No. PCT/KR2021/015637, filed on Nov. 2, 2021, which claims priority to and the benefit of Korean Patent Application No. 10-2020-0146299, filed on Nov. 4, 2020, the disclosure of which is incorporated herein by reference in its entirety. FIELD The present disclosure relates to a movable contact part and a direct current relay including the same, and more specifically to a movable contact part having a structure which is capable of improving the operation reliability while improving the ability to reduce an electromagnetic repulsive force, and a direct current relay including the same. BACKGROUND A direct current (DC) relay is a device that transmits a mechanical drive or current signal using the principle of an electromagnet. A direct current relay is also called a magnetic switch, and it is generally classified as an electrical circuit switching device. The direct current relay may be operated by receiving external control power. The direct current relay includes a fixed core and a movable core that can be magnetized by a control power supply. The fixed core and the movable core are positioned adjacent to a bobbin on which a plurality of coils are wound. When the control power is applied, the plurality of coils form an electromagnetic field. The fixed core and the movable core are magnetized by the electromagnetic field, and electromagnetic attraction is generated between the fixed core and the movable core. Since the fixed core is fixed, the movable core is moved toward the fixed core. One side of the shaft member is connected to the movable core. In addition, the other side of the shaft member is connected to the movable contact. When the movable core is moved toward the fixed core, the shaft and the movable contact connected to the shaft are also moved, By this movement, the movable contact can be moved toward the fixed contact. When the movable contact and the fixed contact are in contact, the direct current relay is energized with an external power source and load. Referring to FIGS. 1 and 2, the direct current relay 1000 according to the related art includes a frame part 1100, a contact part 1200, an actuator 1300 and a movable contact moving part 1400. The frame part 1100 forms the outer shape of the direct current relay 1000. A predetermined space is formed inside the frame part 1100 to accommodate the contact part 1200, the actuator 1300 and the movable contact moving part 1400. When control power is applied from the outside, the coil 1310 which is wound around the bobbin 1320 of the actuator 1300 generates an electromagnetic field. The fixed core 1330 and the movable core 1340 are magnetized by the electromagnetic field. The fixed core 1330 is moved toward a fixed bar, and the movable core 1340 and the movable shaft 1350 connected to the movable core 1340 are moved toward the fixed core 1330. In this case, the movable shaft 1350 is also connected to the movable contact 1220 of the contact part 1200. Accordingly, by the movement of the movable core 1340, the movable contact 1220 and the fixed contact 1210 are in contact to conduct electricity. When the application of the control power is released, the coil 1310 no longer forms an electromagnetic field. Accordingly, the electromagnetic attraction between the movable core 1340 and the fixed core 1330 disappears. As the movable core 1340 moves, the compressed spring 1360 is tensioned, and the movable core 1340 and the movable shaft 1350 and the movable contact 1220 connected thereto are moved downward. The movable contact 1220 is coupled to the movable contact moving part 1400. The movable contact moving part 1400 is configured to move in the vertical direction according to the movement of the movable core 1340. The movable contact moving part 400 includes a movable contact supporting part 1410 for supporting the movable contact 1220 and an elastic part 1430 for elastically supporting the movable contact 1220. In addition, the movable contact cover part 1420 is provided on the upper side of the movable contact 1220 to protect the movable contact 1220. However, in the movable contact moving part 1400 according to the related art, the movable contact 1220 is only elastically supported by the elastic part 1430. That is, a separate member for preventing the movable contact 1220 from being separated from the movable contact moving part 1400 is not provided. When the fixed contact 1210 and the movable contact 1220 are in contact, an electromagnetic repulsive force is generated as current flows. The repulsive force may act such that the movable contact 1220 is spaced apart from the fixed contact 1210. In this case, even when the control power is applied, the direct current relay 1000 is not energized, which may cause malfunction or failure. In addition, there is a possibility that each component of the movable contact moving part 1400 is vibrated or separ