KR-20260066776-A - Switching device

KR20260066776AKR 20260066776 AKR20260066776 AKR 20260066776AKR-20260066776-A

Abstract

The opening and closing device of the present disclosure is configured to have a main circuit formed in a U-shape by an upper terminal (4), a fixed electrode (2), a movable electrode (3), a movable electrode (3), and a lower terminal (5s), and a support body (6) that supports a movable electrode rod (3b), and to have an electrical connection position to the movable electrode rod (3b) and a position where the support body (6) supports the movable electrode rod (3b) set at a position where the positive moment (Mcw) and the negative moment (Mccw) that rotate the movable electrode rod (3b) by the electromagnetic force generated by the current flowing in the main circuit are balanced.

Inventors

후지키 유스케
난바 고헤이
돗토리 히로시

Assignees

미쓰비시덴키 가부시키가이샤

Dates

Publication Date: 20260512
Application Date: 20240109

Claims (10)

A fixed electrode having a fixed contact at one end, A movable contact is provided at one end of a movable electrode rod, and a movable electrode is positioned such that the movable contact, which is positioned opposite to the fixed contact, can be in contact with and separated from the fixed contact by driving along the extension direction of the movable electrode rod. A first terminal connected to the other end of the fixed electrode and extending toward a first direction perpendicular to the elongation direction, A second terminal electrically connected to a first position in the middle portion along the elongation direction of the above-mentioned movable electrode rod and extending toward the first direction, and At a second position between the first position and the movable contact, a support member is provided to support the movable electrode rod from the side of the first direction, and A switching device characterized in that the first position and the second position are set at a position where the forward moment and the reverse moment are balanced, which rotate the movable electrode rod within a plane including the elongation direction with respect to the second position by means of an electromagnetic force generated by the current flowing in the main circuit from the first terminal to the second terminal.
In claim 1, A switching device characterized in that the above support supports the movable electrode rod on both sides in a direction perpendicular to the elongation direction and perpendicular to the first direction at the second position.
In claim 2, A switching device characterized in that the above-mentioned support member has a first through hole into which the movable electrode rod can be inserted, serving as a support portion for supporting the movable electrode rod.
In claim 3, The above support member is characterized by being extended along the first direction in a plane perpendicular to the elongation direction so as to enable movement of the movable electrode rod toward the first direction.
In claim 3 or claim 4, The above support is formed of a material having a higher permeability than the conductive member constituting the second terminal, and An opening/closing device characterized by having a slit formed extending from the first through hole to an outer opening in a plane perpendicular to the elongation direction.
In claim 5, The above slit is characterized by having a width through which the movable electrode rod can move, extending from the first through hole toward the first direction to the outer opening.
In claim 2, A vacuum valve is provided to accommodate the above fixed contact and the above movable contact within a vacuum atmosphere, and An opening and closing device characterized in that the above support member is provided with a support portion for supporting the movable electrode rod, wherein the support portion includes a first through hole into which the movable electrode rod can be inserted, a second through hole into which an electrode rod guide provided in the vacuum valve can be inserted, and a combination of a concave portion into which the electrode rod guide can be fitted and the first through hole.
In claim 7, An opening and closing device characterized in that the support member is extended along the first direction in a plane perpendicular to the elongation direction so as to enable movement toward the first direction of the movable electrode rod or the electrode rod guide.
In claim 7 or claim 8, The above support is formed of a material having a higher permeability than the conductive member constituting the second terminal, and An opening/closing device characterized by having a slit formed extending from the first through hole or the second through hole to an outer opening in a plane perpendicular to the elongation direction.
In claim 9, The opening and closing device is characterized in that the above slit has a width in which the movable electrode rod or the electrode rod guide can move and extends from the first through hole or the second through hole toward the first direction to the outer opening.

Description

Switching device The present disclosure relates to an opening and closing device. In a switching device using a vacuum valve that opens and closes an electric circuit in a vacuum to perform the opening and closing of a large current, for example, since the movable contact moves linearly relative to the fixed contact, the vacuum valve in the main circuit and the path before and after it are configured in a U-shape. In such a switching device, particularly when there is a short-time current resistance duty, the closed state is maintained by applying a force that presses the fixed contact against the movable contact of the vacuum valve by means of the compression force of a spring, etc. However, when a large current, such as a short-circuit current, flows in the closed state, an electromagnetic force acts on the movable contact, and if this electromagnetic force exceeds the frictional force between the contacts caused by the compression force of the spring, the movable contact moves in the direction of the electromagnetic force, causing the contacts to separate and an arc to occur, which may lead to welding of the contacts. In this regard, a switching device is disclosed in which a protrusion extending in the direction of the electromagnetic force is provided in the guide of an insulating frame or vacuum valve, and the movement of a movable electrode rod is suppressed by the protrusion resisting the electromagnetic force (see, for example, Patent Document 1). FIG. 1 is a side view of the opening and closing mechanism part of the opening and closing device according to Embodiment 1. FIGS. 2a and 2b are a plan view of the peripheral portion of the support of the opening and closing device according to Embodiment 1 and a cross-sectional view of the support. Figure 3 is a side view of the area around the support of the opening/closing mechanism part of the opening/closing device according to a comparative example. FIG. 4 is a side view of the opening and closing mechanism part of the opening and closing device according to the first modified example of Embodiment 1. FIGS. 5A and 5B are a plan view of the periphery of a support of an opening and closing device and a cross-sectional view of a support according to a first modified example of Embodiment 1. FIGS. 6a and FIGS. 6b are side views of the periphery of a support of an opening/closing device according to a second modified example of Embodiment 1, and side views of the periphery of a support of an opening/closing device according to a third modified example, respectively. FIGS. 7a and FIGS. 7b are plan views of a support for an opening and closing device according to Embodiment 2 and a support for an opening and closing device according to a modified example, respectively. FIG. 8 is a side view showing the state during assembly of the opening and closing mechanism part of the opening and closing device according to Embodiment 2. FIG. 9 is a side view showing the state during another assembly of the opening and closing mechanism part of the opening and closing device according to Embodiment 2. FIG. 10a and FIG. 10b are plan views of a support for an opening and closing device according to Embodiment 3 and a support for an opening and closing device according to a modified example, respectively. Embodiment 1. FIGS. 1 to 3 are intended to explain the configuration and operation of an opening and closing device according to Embodiment 1. FIG. 1 is a side view in which a part of a vacuum valve is cut out so that a contact part is visible in the opening and closing mechanism part of the opening and closing device. FIG. 2a is a plan view of the periphery of a support body. FIG. 2b is a cross-sectional view of a support body along the line A-A of FIG. 2a. FIG. 3 is a side view of the periphery of a support body according to a comparative example, in the same depiction direction as FIG. 1. FIGS. 4 to 5b are intended to explain the configuration and operation of an opening and closing device according to a first modified embodiment of Embodiment 1, where FIG. 4 is a side view of the opening and closing mechanism part corresponding to FIG. 1, FIG. 5a is a plan view of the support body periphery part corresponding to FIG. 2a, and FIG. 5b is a cross-sectional view of the support body along the line B-B of FIG. 5a. Additionally, FIG. 6a is a side view of the support body of an opening and closing device according to a second modified embodiment, and FIG. 6b is a side view of the support body of an opening and closing device according to a third modified embodiment, with the depiction direction corresponding to FIG. 1. Furthermore, in this specification, the front side is positioned upward, the z-direction is expressed as the up-down direction, the front side as the front-back direction, and the y-direction as the left-right direction, but it goes without saying that the actual installation state may differ. As shown in FIG. 1, the opening and closing device according to Emb