WO2020013224A1 - Contact device and electromagnetic relay - Google Patents

Abstract

Provided are a contact device and an electromagnetic relay that can stabilize the connection between a mobile contact and a fixed contact during abnormal current flow. A contact device (1) that comprises: fixed terminals (31, 32) that have fixed contacts (311, 321); a mobile contact element (8); an electric path piece (224); and an electric path piece (226). As seen from the movement direction of the mobile contact element (8), electric path piece (224) and electric path piece (226) are arranged on the same side of the mobile contact element (8). Current flows in electric path piece (224) in the opposite direction of current that flows in the mobile contact element (8). Current flows in electric path piece (226) in the same direction as current that flows in the mobile contact element (8). When, as seen from the front-rear direction, electric path piece (226) is overlapping the mobile contact element (8), of the two movement-direction end parts of the mobile contact element (8), electric path piece (226) overlaps at least the end part that is close to the fixed contacts (311, 321).

Description

Contact device and electromagnetic relay

The present disclosure generally relates to a contact device and an electromagnetic relay, and more particularly, to a contact device and an electromagnetic relay capable of switching contact / separation of a movable contact with respect to a fixed contact.

Patent Document 1 describes a contact device that turns current on and off at a contact.

In the contact device described in Patent Literature 1, a movable contact included in the contact device is moved by an electromagnetic force generated by energizing an exciting coil (exciting winding) of the electromagnet device, and a fixed terminal included in the contact device is provided. The movable contact of the movable contact is brought into contact with the fixed contact. Thereby, the fixed terminal and the movable contact are connected.

In the above-described contact device, for example, when an abnormal current such as a short-circuit current flows, a Lorentz force (electromagnetic repulsion) in a direction in which the movable contact is separated from the fixed contact acts on the movable contact, and the movable contact The connection state with the fixed contact may be unstable.

JP 2014-232668 A

The present disclosure has been made in view of the above problems, and has as its object to provide a contact device and an electromagnetic relay capable of stabilizing a connection state between a movable contact and a fixed contact when an abnormal current flows.

接点 A contact device according to an aspect of the present disclosure includes a fixed terminal having a fixed contact, a movable contact, and a reverse-direction path piece and a forward-direction path piece, at least one of which is electrically connected to the fixed terminal. The movable contact has a movable contact, and moves between a closed position where the movable contact contacts the fixed contact and an open position where the movable contact is separated from the fixed contact. A current flows in a first direction from one end of the movable contact to the other end. The reverse direction electric path piece and the forward direction electric path piece are arranged on the same side with respect to the movable contact when viewed from the moving direction of the movable contact. The reverse-direction electric path piece extends along the first direction. When the position of the movable contact is the closed position, at least a part of the reverse direction electric path piece is viewed from a second direction orthogonal to both the moving direction and the first direction of the movable contact. The movable contact is disposed so as to be located on the opposite side to the fixed contact. In the reverse direction electric circuit piece, the current flows in the third direction from the other end of the movable contact to the one end. The forward direction electric circuit piece extends along the first direction. When the position of the movable contact is the closed position, at least a part of the forward contact is located on the same side as the fixed contact with respect to the movable contact when viewed from the second direction. Are located in The current flows in the first direction in the forward direction electric circuit piece. One of the reverse direction path piece and the forward direction path piece overlaps with the movable contact when viewed from the second direction when the position of the movable contact is the closed position. When the reverse electric path piece overlaps the movable contact as viewed from the second direction, the reverse electric path piece is at least from the fixed contact among the both ends in the moving direction of the movable contact. Overlaps with the far end. When the forward electric path piece overlaps with the movable contact as viewed from the second direction, the forward electric path piece is provided on at least the fixed contact among both ends in the moving direction of the movable contact. It overlaps the near end.

電磁 An electromagnetic relay according to an aspect of the present disclosure includes the contact device and an electromagnet device that moves the movable contact. The electromagnet device includes an exciting coil and a yoke that forms a part of a path of a magnetic flux generated in the exciting coil.

FIG. 1A is a perspective view of an electromagnetic relay according to one embodiment. FIG. 1B is a cross-sectional view of the electromagnetic relay, taken along the line X1-X1. FIG. 2 is an X2-X2 cross-sectional view of the electromagnetic relay. FIG. 3 is a diagram illustrating a flow of current in a contact device provided in the electromagnetic relay according to the first embodiment. FIG. 4 is a diagram for explaining a magnetic flux generated by a current flowing through a bus bar provided in the contact device and a magnetic flux passing through the first yoke and the second yoke. FIG. 5 is a diagram showing a positional relationship between a bus bar and a movable contact provided in the contact device of the above. FIG. 6A is a view corresponding to the cross-sectional view of FIG. 2 and illustrating the assisting force of the bus bar provided in the contact device of the above. FIG. 6B is a plan view showing a schematic configuration of the above contact device. FIG. 7 is a cross-sectional view of an electromagnetic relay according to a first modification. 8A and 8B are diagrams illustrating the flow of current in the contact device provided in the electromagnetic relay according to the second modification. FIG. 9 is a cross-sectional view of an electromagnetic relay according to a third modification.

Embodiments and modifications described below are merely examples of the present disclosure, and the present disclosure is not limited to the embodiments and the modifications, and even if other than the embodiments and the modifications, the present disclosure is not limited to the embodiments and the modifications. Various changes can be made according to the design and the like as long as the technical idea is not deviated. Further, in the following embodiments and modified examples, the drawings to be described are schematic diagrams, and the ratio of the size and thickness of each component in the drawings does not necessarily reflect the actual dimensional ratio. Not necessarily.

(Embodiment)
Hereinafter, the contact device 1 and the electromagnetic relay 100 according to the present embodiment will be described with reference to FIGS. 1A to 6B.

(1) Configuration (1.1) Overall Configuration The electromagnetic relay 100 according to the present embodiment includes a contact device 1 and an electromagnet device 10. The contact device 1 has a pair of fixed terminals 31 and 32 and a movable contact 8 (see FIG. 1B). The fixed terminals 31 and 32 hold fixed contacts 311 and 321, respectively. The movable contact 8 holds a pair of movable contacts 81 and 82.

The electromagnet device 10 includes the mover 13 and the exciting coil 14 (see FIG. 1B). The electromagnet device 10 attracts the mover 13 by a magnetic field generated in the exciting coil 14 when the exciting coil 14 is energized. The movable contact 8 moves from the open position to the closed position with the suction of the mover 13. The “open position” in the present disclosure is the position of the movable contact 8 when the movable contacts 81 and 82 move away from the fixed contacts 311 and 321. The “closed position” in the present disclosure is a position of the movable contact 8 when the movable contacts 81 and 82 come into contact with the fixed contacts 311 and 321.

In addition, in the present embodiment, the mover 13 is arranged on the straight line L, and is configured to reciprocate straight along the straight line L (see FIGS. 1B and 2). The exciting coil 14 is configured by a conductive wire (electric wire) wound around a straight line L. That is, the straight line L corresponds to the central axis of the exciting coil 14.

実 施 In the present embodiment, a case where the contact device 1 forms an electromagnetic relay 100 together with the electromagnet device 10 as shown in FIG. 1A will be described as an example. However, the contact device 1 is not limited to the electromagnetic relay 100 and may be used for, for example, a breaker (breaker) or a switch. In the present embodiment, a case where the electromagnetic relay 100 is mounted on an electric vehicle will be described as an example. In this case, the contact device 1 (fixed terminals 31 and 32) is electrically connected to the DC power supply path from the running battery to the load (for example, the inverter).

(1.2) Contact Device Next, the configuration of the contact device 1 will be described.

1) The contact device 1 includes a pair of fixed terminals 31, 32, a movable contact 8, a housing 4, and a flange 5, as shown in FIGS. 1A and 1B. The contact device 1 further includes a first yoke 6, a second yoke 7, two capsule yokes 23, 24, two arc-extinguishing magnets (permanent magnets) 25, 26, an insulating plate 41, and a cover 50. The fixed terminal 31 holds the fixed contact 311, and the fixed terminal 32 holds the fixed contact 321. The movable contact 8 is a plate-shaped member made of a conductive metal material. The movable contact 8 holds a pair of movable contacts 81 and 82.

In the following, for the sake of explanation, the facing direction between the fixed contacts 311 and 321 and the movable contacts 81 and 82 is defined as the up-down direction, and the fixed contacts 311 and 321 side as viewed from the movable contacts 81 and 82 is defined as upward. Further, a direction in which the pair of fixed terminals 31 and 32 (a pair of fixed contacts 311 and 321) are arranged is defined as a left-right direction, and the fixed terminal 32 side as viewed from the fixed terminal 31 is defined as a right side. That is, hereinafter, the upper, lower, left, and right in FIG. Hereinafter, a direction orthogonal to both the up-down direction and the left-right direction (a direction orthogonal to the plane of FIG. 1B) will be described as the front-back direction. However, these directions are not intended to limit the usage of the contact device 1 and the electromagnetic relay 100.

One fixed contact 311 is held at one end of one fixed terminal 31, and the other fixed contact 321 is held at one end of the other fixed terminal 32.

(4) The pair of fixed terminals 31 and 32 are arranged so as to be arranged in the left-right direction (see FIG. 1B). Each of the pair of fixed terminals 31 and 32 is made of a conductive metal material. The pair of fixed terminals 31 and 32 function as terminals for connecting an external circuit (battery and load) to the pair of fixed contacts 311 and 321. In the present embodiment, the fixed terminals 31 and 32 made of copper (Cu) are used as an example. However, the fixed terminals 31 and 32 are not limited to copper, and the fixed terminals 31 and 32 are made of a material other than copper. It may be formed of a conductive material.

Each of the pair of fixed terminals 31 and 32 is formed in a columnar shape having a circular cross section in a plane orthogonal to the vertical direction. Here, each of the pair of fixed terminals 31 and 32 is configured such that the diameter at the upper end (the other end) is larger than the diameter at the lower end (the one end), and the front view is T-shaped. ing. The pair of fixed terminals 31 and 32 are held by the housing 4 with a part (the other end) protruding from the upper surface of the housing 4. Specifically, each of the pair of fixed terminals 31 and 32 is fixed to the housing 4 in a state of penetrating an opening formed in the upper wall of the housing 4.

The movable contact 8 has a thickness in the up-down direction and is formed in a plate shape longer in the left-right direction than in the front-rear direction. The movable contact 8 is disposed below the pair of fixed terminals 31 and 32 such that both ends in the longitudinal direction (left and right direction) face the pair of fixed contacts 311 and 321 (see FIG. 1B). In the movable contact 8, a pair of movable contacts 81 and 82 is provided at a portion facing the pair of fixed contacts 311 and 321 (see FIG. 1B).

The movable contact 8 is housed in the housing 4. The movable contact 8 is moved up and down by the electromagnet device 10. Thereby, the movable contact 8 moves between the closed position and the open position. 1B and 2 show a state in which the movable contact 8 is located at the closed position. In this state, the pair of movable contacts 81 and 82 held by the movable contact 8 correspond to the corresponding fixed contacts, respectively. Contact 311 and 321. On the other hand, when the movable contact 8 is located at the open position, the pair of movable contacts 81 and 82 held by the movable contact 8 are separated from the corresponding fixed contacts 311 and 321 respectively.

Therefore, when the movable contact 8 is in the closed position, a short circuit occurs between the pair of fixed terminals 31 and 32 via the movable contact 8. For example, if the movable contact 8 is in the closed position, the movable contacts 81 and 82 come into contact with the fixed contacts 311 and 321. Therefore, the fixed terminal 31 is composed of the fixed contact 311, the movable contact 81, the movable contact 8 and the movable contact 82. And, it is electrically connected to the fixed terminal 32 via the fixed contact 321. Therefore, if the fixed terminal 31 is electrically connected to one of the battery and the load and the fixed terminal 32 is electrically connected to the other, when the movable contact 8 is in the closed position, the contact device 1 A path for supplying DC power from the power supply to the load is formed.

Here, the movable contacts 81 and 82 only need to be held by the movable contact 8. Therefore, the movable contacts 81 and 82 may be formed integrally with the movable contact 8 by, for example, stamping out a part of the movable contact 8, or may be formed of a member separate from the movable contact 8 and may be formed by, for example, welding. For example, it may be fixed to the movable contact 8. Similarly, the fixed contacts 311 and 321 only need to be held by the fixed terminals 31 and 32. Therefore, the fixed contacts 311 and 321 may be formed integrally with the fixed terminals 31 and 32, or may be made of a separate member from the fixed terminals 31 and 32, and are fixed to the fixed terminals 31 and 32 by, for example, welding. May be.

The movable contact 8 has a through hole 83 at the center. In the present embodiment, the through hole 83 is formed in the movable contact 8 between the pair of movable contacts 81 and 82. The through hole 83 penetrates the movable contact 8 in the thickness direction (vertical direction). The through hole 83 is a hole for passing a shaft 15 described later.

The first yoke 6 is a magnetic material, and is formed of, for example, a metal material such as iron. The first yoke 6 is fixed to a tip (upper end) of the shaft 15. The shaft 15 penetrates the movable contact 8 through the through hole 83 of the movable contact 8, and the tip (upper end) of the shaft 15 projects upward from the upper surface of the movable contact 8. Therefore, the first yoke 6 is located above the movable contact 8 (see FIG. 1B). Specifically, the first yoke 6 is located on the same side as the fixed contacts 311 and 321 exist with respect to the movable contact 8 in the moving direction of the movable contact 8. Further, the first yoke 6 may be fixed to the housing 4. That is, the first yoke 6 may be fixed relatively to the fixed contacts 311 and 321.

The second yoke 7 is a magnetic material, and is formed of, for example, a metal material such as iron. The second yoke 7 is fixed to the lower surface of the movable contact 8 (see FIG. 1B). Specifically, in the moving direction of the movable contact 8, the second yoke 7 is located on the side opposite to the side where the fixed contacts 311 and 321 exist with respect to the movable contact 8 in the vertical direction of the movable contact 8. Is fixed (located) on the surface. Thereby, the second yoke 7 moves in the up-down direction with the up-down movement of the movable contact 8. That is, the second yoke 7 moves relatively to the fixed contacts 311 and 321.

The second yoke 7 has a through hole 71 at the center. In the present embodiment, the through hole 71 is formed at a position corresponding to the through hole 83 of the movable contact 8. The through hole 71 penetrates the second yoke 7 in the thickness direction (vertical direction). The through hole 71 is a hole for passing the shaft 15 and a contact pressure spring 17 described later.

The second yoke 7 has a pair of projecting portions 72, 73 (see FIG. 2) projecting upward at both ends in the front-rear direction. In other words, the projecting portions 72 projecting in the same direction as the direction in which the movable contact 8 moves from the open position to the closed position (upward in the present embodiment) are provided at both ends in the front-rear direction on the upper surface of the second yoke 7. 73 are formed.

According to such a shape, as shown in FIG. 4, the front end surface (upper end surface) of the front protruding portion 72 of the pair of protruding portions 72, 73 is attached to the front end portion 61 of the first yoke 6, The front end surface (upper end surface) of the projection 73 is abutted against the rear end 62 of the first yoke 6. Therefore, when the current I1 flows through the movable contact 8 in the direction illustrated in FIG. 4, a magnetic flux φ1 passing through the magnetic path formed by the first yoke 6 and the second yoke 7 is generated. At this time, the front end of the first yoke 6 and the protruding portion 73 have an N pole, and the rear end 62 of the first yoke 6 and the protruding portion 72 have an S pole. A suction force acts between the first yoke 7 and the second yoke 7.

The capsule yokes 23 and 24 are magnetic materials, and are formed of a metal material such as iron, for example. The capsule yokes 23 and 24 form a magnetic circuit through which the magnetic flux of the arc extinguishing magnets 25 and 26 passes. The capsule yokes 23 and 24 hold the arc extinguishing magnets 25 and 26. The capsule yokes 23 and 24 are arranged on both sides in the front-rear direction with respect to the housing 4 so as to surround the housing 4 from both sides in the front-rear direction.

The arc extinguishing magnets 25 and 26 are arranged so that the same pole (for example, the N pole) is opposed to each other in the left-right direction, or the different poles are opposed to each other. The arc-extinguishing magnets 25 and 26 are arranged on both sides in the left-right direction with respect to the housing 4. The capsule yokes 23 and 24 surround the housing 4 together with the arc extinguishing magnets 25 and 26. The arc-extinguishing magnets 25 and 26 are arranged in a direction in which the fixed contacts 311 and the fixed contacts 321 are arranged when viewed from one of the moving directions of the movable contact 8. When the movable contact 8 moves from the closed position to the open position, a discharge current (arc) is generated between the fixed contact 311 and the movable contact 81 and between the fixed contact 321 and the movable contact 82. The arc-extinguishing magnets 25 and 26 extend the arcs generated between the fixed contact 311 and the movable contact 81 and between the fixed contact 321 and the movable contact 82, respectively. The arc-extinguishing magnets 25 and 26 may be arranged in a direction orthogonal to the direction in which the fixed contacts 311 and 321 are arranged when viewed from one of the moving directions of the movable contact 8. In this case, the arc extinguishing magnets 25 and 26 are arranged so that the same pole (for example, the N pole) faces each other.

The housing 4 is made of a ceramic such as aluminum oxide (alumina). The housing 4 is formed in a hollow rectangular parallelepiped shape longer in the left-right direction than in the front-rear direction. The lower surface of the housing 4 is open. The housing 4 accommodates a pair of fixed contacts 311 and 321, the movable contact 8, the first yoke 6, and the second yoke 7. A pair of opening holes for passing the pair of fixed terminals 31 and 32 are formed in the upper surface of the housing 4. Each of the pair of opening holes is formed in a circular shape, and penetrates the upper wall of the housing 4 in the thickness direction (vertical direction). The fixed terminal 31 is passed through one opening, and the fixed terminal 32 is passed through the other opening. The pair of fixed terminals 31 and 32 and the housing 4 are joined by brazing.

The housing 4 may be formed in a box shape that accommodates the pair of fixed contacts 311 and 321 and the movable contact 8, and is not limited to a hollow rectangular parallelepiped as in the present embodiment, but may be, for example, a hollow ellipse. It may have a cylindrical shape or a hollow polygonal column shape. In other words, the box shape here means any shape having a space for accommodating the pair of fixed contacts 311 and 321 and the movable contact 8 therein, and is not intended to be limited to a rectangular parallelepiped shape. The housing 4 is not limited to being made of ceramic, and may be made of, for example, an insulating material such as glass or resin, or may be made of metal. The housing 4 is preferably made of a non-magnetic material that does not become a magnetic material due to magnetism.

Flange 5 is formed of a non-magnetic metal material. The non-magnetic metal material is, for example, austenitic stainless steel such as SUS304. The flange 5 is formed in a hollow rectangular parallelepiped shape that is long in the left-right direction. The upper and lower surfaces of the flange 5 are open.

For example, the flange 5 is disposed between the housing 4 and the electromagnet device 10 (see FIGS. 1B and 2). The flange 5 is hermetically joined to the casing 4 and a yoke upper plate 111 of the electromagnet device 10 described later. Thereby, the internal space of the contact device 1 surrounded by the housing 4, the flange 5, and the yoke upper plate 111 can be an airtight space. The flange 5 does not have to be non-magnetic, and may be, for example, an alloy mainly composed of iron such as 42 alloy.

The insulating plate 41 is made of synthetic resin and has electric insulation. The insulating plate 41 is formed in a rectangular plate shape. The insulating plate 41 is located on the side opposite to the side where the fixed contacts 311 and 321 exist with respect to the movable contact 8 in the moving direction of the movable contact 8. The insulating plate 41 prevents a short circuit due to an arc generated between the movable contact 8 and the fixed contacts 311 and 321.

The insulating plate 41 has a through hole 42 at the center. In the present embodiment, the through hole 42 is formed at a position corresponding to the through hole 83 of the movable contact 8. The through hole 42 penetrates the insulating plate 41 in the thickness direction (vertical direction). The through hole 42 is a hole for passing the shaft 15.

The cover 50 is made of a non-magnetic material and is formed in a hollow rectangular parallelepiped that is longer in the left-right direction than in the front-rear direction. The cover 50 is disposed so as to expose the swaged portion 35 of the fixed terminal 31 and the swaged portion 36 of the fixed terminal 32 and cover the housing 4. The front surface 51 of the cover 50 is formed in a step shape (see FIG. 1A). The cover 50 holds the capsule yokes 23 and 24 and the arc extinguishing magnets 25 and 26.

The contact device 1 further includes bus bars 21 and 22.

The busbars 21 and 22 are made of a conductive metal material (for example, copper or a copper alloy). In the present embodiment, the bus bars 21 and 22 are made of copper as an example. The bus bars 21 and 22 are formed in a strip shape. In this embodiment, the bus bars 21 and 22 are formed by bending a metal plate. One end of the bus bar 21 is electrically connected to, for example, the fixed terminal 31. The other end of the bus bar 21 is electrically connected to, for example, a running battery. One end of the bus bar 22 is electrically connected to, for example, the fixed terminal 32. The other end of the bus bar 22 is electrically connected to, for example, a load.

The bus bar 21 is mechanically connected to the fixed terminal 31 (see FIG. 1B). Specifically, the bus bar 21 is caulked to the fixed terminal 31 at the caulked portion 35 of the fixed terminal 31.

The bus bar 22 includes seven electric circuit pieces 221 to 227.

The electric circuit piece 221 is mechanically connected to the fixed terminal 32. Specifically, the electric circuit piece 221 has a substantially rectangular shape in plan view, and is caulked to the fixed terminal 32 at the caulked portion 36 of the fixed terminal 32.

The electric circuit piece 222 is connected to the electric circuit piece 221, and is disposed on the right side of the cover 50 so as to extend downward from the right end of the electric circuit piece 221. The electric circuit piece 223 is connected to the electric circuit piece 222 and is disposed on the right side of the cover 50 so as to extend forward from the lower end of the electric circuit piece 222.

The electric circuit piece 224 (reverse electric circuit piece) is connected to the electric circuit piece 223, and extends forward from the front end of the electric circuit piece 223 to the left (toward the fixed terminal 31 when viewed from the fixed terminal 32). Are located in The thickness direction (front-back direction) of the electric path piece 224 is orthogonal to the moving direction (up-down direction) of the movable contact 8. The width direction (vertical direction) of the electric path piece 224 is along the moving direction of the movable contact 8.

The electric circuit piece 225 (connection electric circuit piece) is connected to the electric circuit piece 224 and is disposed in front of the cover 50 so as to extend upward from the left end of the electric circuit piece 224. The electric path piece 225 is formed in a shape following the shape of the front surface 51 of the cover 50, that is, in a shape having a step.

The electric circuit piece 226 (forward direction electric circuit piece) is connected to the electric circuit piece 225, and extends forward from the upper end of the electric circuit piece 225 to the right (toward the fixed terminal 32 when viewed from the fixed terminal 31). Are located in The thickness direction (front-back direction) of the electric path piece 226 is orthogonal to the moving direction (up-down direction) of the movable contact 8. The width direction (vertical direction) of the electric path piece 226 is along the moving direction of the movable contact 8.

The electric circuit piece 227 is connected to the electric circuit piece 226, and is disposed in front of the cover 50 so as to extend forward from the right end of the electric circuit piece 226.

In the present embodiment, the electric path pieces 224 to 226 are disposed on the same side (here, the front side) with respect to the movable contact 8 when viewed from one of the moving directions (up and down directions) of the movable contact 8.

The length of the electric circuit piece 222 is longer than the length of the fixed terminal 32 in the vertical direction. Here, the vertical length of the fixed terminals 31 and 32 is a dimension from the upper edge of the fixed terminal 32 to the lower edge (including the fixed contact 321) of the fixed terminal 32.

中空 By providing the electric circuit piece 225, the hollow portion 500 exists between the electric circuit piece 224 and the electric circuit piece 226 (see FIGS. 4 and 5).

Here, when the movable contact 8 is located at the closed position, when the movable contact 8 is located at the closed position, the movable The contact 8 overlaps at least a part of the electric circuit piece 226. Specifically, when the position of the movable contact 8 is the closed position, when viewed from one side in the front-rear direction, the electric path piece 226 includes at least both ends 85, 85 of the movable contact 8 in the moving direction of the movable contact 8. The end portion (upper end portion) 85 of the 86 near the fixed contacts 311 and 321 overlaps. That is, the electric circuit piece 226 is arranged such that the upper end 85 of the movable contact 8 is located within the range R1 between the upper edge of the electric circuit piece 226 and the lower edge of the electric circuit piece 226. In the present embodiment, as shown in FIG. 5, of the two ends 241 and 242 of the electric circuit piece 226 in the vertical direction, the end 241 near the electric circuit piece 224 overlaps the movable contact 8.

一部 A part of the electric circuit piece 224 is located on the exciting coil 14 side with respect to the yoke upper plate 111 of the yoke 11, which will be described later, as viewed from one side in the front-rear direction (see FIG. 5). In other words, a part of the electric path piece 224 overlaps with the yoke upper plate 111 and a part of the exciting coil 14 when viewed from one side in the front-back direction. In addition, a part of the electric circuit piece 224 may overlap with only the yoke upper plate 111 when viewed from one side in the front-rear direction. That is, a part of the electric path piece 224 overlaps with the yoke upper plate 111 or is located on the exciting coil 14 side with respect to the yoke upper plate 111 when viewed from one side in the front-rear direction. Further, all of the electric path pieces 224 may be located on the excitation coil 14 side with respect to the yoke upper plate 111 when viewed from one side in the front-rear direction. Therefore, at least a part of the electric path piece 224 only needs to overlap the yoke upper plate 111 or be located on the exciting coil 14 side with respect to the yoke upper plate 111 when viewed from one side in the front-rear direction.

Furthermore, the length of the electric circuit piece 224 and the length of the electric circuit piece 226 are each equal to or greater than the distance between the movable contact 81 and the movable contact 82. Here, the distance between the movable contact 81 and the movable contact 82 is the shortest distance between the movable contact 81 and the movable contact 82 as viewed from the front-back direction.

In the present embodiment, the electric circuit piece 224 extends leftward (projects) from the electric circuit piece 223, and the electric circuit piece 226 extends rightward (projects) from the electric circuit piece 225. Here, it is assumed that a current I1 flows through the movable contact 8 from the fixed terminal 31 to the fixed terminal 32 first. At this time, the current I1 is generated by the bus bar 21, the fixed terminal 31, the movable contact 8, the fixed terminal 32, the electric circuit piece 221, the electric circuit piece 222, the electric circuit piece 223, the electric circuit piece 224, the electric circuit piece 225, the electric circuit piece 226, and the electric circuit piece 227. (See FIG. 3). In the circuit piece 224, the current I1 flows from right to left (the fixed terminal 31 side as viewed from the fixed terminal 32), and in the circuit piece 226, the current I1 flows from left to right (the fixed terminal 32 side as viewed from the fixed terminal 31). ). On the other hand, in the movable contact 8, the current I1 flows from left to right. Conversely, when the current I1 flows through the movable contact 8 from the fixed terminal 32 toward the fixed terminal 31, the current I1 flows from the left to the right (the fixed terminal 32 side when viewed from the fixed terminal 31) in the circuit path piece 224. On the other hand, the current I1 flows from the right side to the left side (the fixed terminal 31 side when viewed from the fixed terminal 32) in the conductor piece 226.

In other words, the direction of the current I1 flowing through the movable contact 8 is the same as the direction of the current I1 flowing through the conductor piece 226. On the other hand, the direction of the current I1 flowing through the movable contact 8 and the direction of the current I1 flowing through the electric path piece 224 are opposite.

When the current I1 flows through the movable contact 8 from the fixed terminal 31 to the fixed terminal 32, as shown in FIG. 6A and FIG. (The fixed terminal 31 side when viewed from the fixed terminal 32). At this time, it is assumed that the direction of the current I2 flowing through the exciting coil 14 is clockwise as viewed from above. That is, in a portion of the exciting coil 14 facing the electric circuit piece 224 (the front side of the exciting coil 14), the current I2 flows to the left (the fixed terminal 31 side when viewed from the fixed terminal 32) (see FIG. 6B). . FIG. 6A is a conceptual diagram in which the illustration of the contact device 1 is omitted in a cross section similar to FIG. Further, in FIG. 6B, some of the components of the contact device 1 are omitted for convenience of explanation.

Conversely, when the current I1 flows through the movable contact 8 from the fixed terminal 32 to the fixed terminal 31, the current I1 flows to the right in the conductor piece 224. At this time, the direction of the current I2 flowing through the exciting coil 14 is assumed to be counterclockwise when viewed from above. That is, the current I2 flows rightward in a portion of the excitation coil 14 facing the electric circuit piece 225 (on the front side of the excitation coil 14).

That is, in the present embodiment, as shown in FIG. 6A and FIG. 6B, the electric circuit piece 224 is formed in a tangential direction of a part 141 of the circumferential direction of the exciting coil 14 when viewed from one side (above) in the axial direction of the exciting coil 14. It extends along D1. Here, the direction of the current I1 flowing through the electric circuit piece 224 is the same as the direction of the current I2 flowing through a part 141 in the circumferential direction of the exciting coil 14 when the exciting coil 14 is energized. In the present embodiment, the circumferential portion 141 of the exciting coil 14 is the front end of the exciting coil 14 located in front of the center axis of the exciting coil 14. Therefore, the tangential direction D1 of the part 141 is the left-right direction. In FIG. 6B, the “tangent line” is indicated by a dashed-dotted line, and the “tangent line” is denoted by “D1” in the “tangential direction”.

(1.3) Electromagnet Device Next, the configuration of the electromagnet device 10 will be described.

The electromagnet device 10 is located on the side opposite to the side where the fixed contacts 311 and 321 exist with respect to the movable contact 8 in the moving direction of the movable contact 8 of the contact device 1.

The electromagnet device 10 includes a stator 12, a mover 13, and an exciting coil 14, as shown in FIGS. 1B and 2. The electromagnet device 10 attracts the mover 13 to the stator 12 by the magnetic field generated in the excitation coil 14 when the excitation coil 14 is energized, and moves the mover 13 toward the stator 12.

The electromagnet device 10 includes a yoke 11 including a yoke upper plate 111, a shaft 15, a cylindrical body 16, a contact pressure spring 17, and a return spring 18 in addition to the stator 12, the mover 13, and the excitation coil 14. And a coil bobbin 19.

The stator 12 is a fixed iron core formed in a cylindrical shape protruding from the central portion of the yoke upper plate 111 toward the mover 13. One end of the stator 12 is fixed to the yoke upper plate 111.

The mover 13 is a movable iron core formed in a columnar shape. The mover 13 is arranged to face the stator 12. The mover 13 is configured to be vertically movable. The mover 13 moves between an excitation position where one end surface thereof is in contact with the stator 12 (see FIGS. 1B and 2) and a non-excitation position where one end surface is away from the stator 12. The “excitation position” in the present disclosure is the position of the mover 13 when the excitation coil 14 is energized. Further, the “non-excitation position” in the present disclosure is a position of the mover 13 when the excitation coil 14 is not energized.

(4) The excitation coil 14 is arranged in such a direction that its central axis direction coincides with the vertical direction. The stator 12 and the mover 13 are arranged inside the excitation coil 14.

The yoke 11 is arranged so as to surround the exciting coil 14, and forms a magnetic circuit through which a magnetic flux generated when the exciting coil 14 is energized passes together with the stator 12 and the mover 13. Therefore, the yoke 11, the stator 12, and the mover 13 are all formed of a magnetic material. The yoke upper plate 111 forms a part of the yoke 11. In other words, at least a part of the yoke 11 (the yoke upper plate 111) is located between the exciting coil 14 and the movable contact 8.

The contact pressure spring 17 is arranged between the movable contact 8 and the insulating plate 41. The contact pressure spring 17 is a coil spring that biases the movable contact 8 toward the fixed contacts 311 and 321 (see FIG. 1B).

The return spring 18 is at least partially disposed inside the stator 12. The return spring 18 is a coil spring that biases the mover 13 to the non-excited position. One end of the return spring 18 is connected to one end surface of the mover 13, and the other end of the return spring 18 is connected to the yoke upper plate 111 (see FIG. 1B).

The shaft 15 is made of a non-magnetic material. The shaft 15 is formed in a round bar shape extending vertically. The shaft 15 includes a through hole 83, a through hole 71, an inside of the contact pressure spring 17, a through hole 42, a through hole formed in a central portion of the yoke upper plate 111, an inside of the stator 12, and an inside of the return spring 18. , The lower end of which is fixed to the mover 13. The first yoke 6 is fixed to the tip of the shaft 15.

シ ャ フ ト The shaft 15 of the electromagnet device 10 transmits the driving force generated by the electromagnet device 10 to the contact device 1.

The coil bobbin 19 is made of a synthetic resin and has the exciting coil 14 wound therearound.

The cylindrical body 16 is formed in a bottomed cylindrical shape with one end surface opened. The periphery of the opening of the cylindrical body 16 is joined to the yoke upper plate 111. Thereby, the cylinder 16 restricts the moving direction of the mover 13 in the vertical direction, and defines the non-excited position of the mover 13. The cylindrical body 16 is air-tightly joined to the lower surface of the yoke upper plate 111. Thus, for example, even if a through hole is formed in the yoke upper plate 111 of the electromagnet device 10, the contact device surrounded by the housing 4, the flange 5 of the contact device 1 and the yoke upper plate 111 of the electromagnet device 10. 1, the airtightness of the internal space can be ensured.

With this configuration, as the mover 13 of the electromagnet device 10 moves up and down by the driving force generated by the electromagnet device 10, the movable contact 8 of the contact device 1 moves up and down.

(2) Operation Next, the operation of the electromagnetic relay 100 having the above-described configuration will be briefly described.

When the excitation coil 14 is not energized (when not energized), no magnetic attraction force is generated between the mover 13 and the stator 12, so that the mover 13 is de-energized by the spring force of the return spring 18. Position. At this time, the shaft 15 has been pulled down. The upward movement of the movable contact 8 is restricted by the shaft 15. As a result, the movable contact 8 is located at the open position which is the lower end position in the movable range. Therefore, the pair of movable contacts 81 and 82 are separated from the pair of fixed contacts 311 and 321 and the contact device 1 is opened. In this state, the pair of fixed terminals 31 and 32 are non-conductive.

On the other hand, when the excitation coil 14 is energized, a magnetic attraction force is generated between the mover 13 and the stator 12, so that the mover 13 is pulled upward against the spring force of the return spring 18 and the excitation position is increased. Go to At this time, since the shaft 15 is pushed upward, the upward movement of the movable contact 8 by the shaft 15 is restricted. When the contact pressure spring 17 urges the movable contact 8 upward, the movable contact 8 moves to the closed position, which is the upper end position in the movable range. Therefore, the pair of movable contacts 81 and 82 come into contact with the pair of fixed contacts 311 and 321, and the contact device 1 is closed. In this state, since the contact device 1 is in the closed state, conduction between the pair of fixed terminals 31 and 32 is established.

As described above, the electromagnet device 10 controls the attraction force acting on the mover 13 by switching the energized state of the excitation coil 14, and moves the mover 13 in the up and down direction, thereby opening and closing the contact device 1. A driving force for switching between the state and the state is generated. In the present embodiment, the electromagnetic relay 100 is a so-called normally-off type in which the movable contact 8 is located at the open position when the excitation coil 14 is not energized. Therefore, when the mover 13 is at the non-excited position, the contact device 1 is in the open state, and when the mover 13 is at the excited position, the contact device 1 is in the closed state.

(3) Advantages Here, advantages of having the above-described bus bar 22 and advantages of having the first yoke 6 and the second yoke 7 will be described.

(4) When the excitation coil 14 is energized, the movable element 13 moves from the non-excitation position to the excitation position in the electromagnet device 10 as described above. At this time, the movable contact 8 moves upward by the driving force generated by the electromagnet device 10, and moves from the open position to the closed position. As a result, the movable contacts 81 and 82 come into contact with the fixed contacts 311 and 321 and the contact device 1 is closed. When the contact device 1 is in the closed state, the movable contacts 81 and 82 are pressed against the fixed contacts 311 and 321 by the contact pressure spring 17.

By the way, when the contact device 1 is in the closed state, an electromagnetic repulsive force for separating the movable contacts 81 and 82 from the fixed contacts 311 and 321 occurs due to the current flowing through the contact device 1 (between the fixed terminals 31 and 32). . That is, when a current flows through the contact device 1, a Lorentz force causes the movable contact 8 to act on the movable contact 8 in a direction (downward) to move the movable contact 8 from the closed position to the open position. Since the electromagnetic repulsion is normally smaller than the spring force of the contact pressure spring 17, the movable contact 8 keeps the movable contacts 81 and 82 in contact with the fixed contacts 311 and 321. However, when a very large current (abnormal current, for example, about 6 kA) such as a short-circuit current flows through the contact device 1, the electromagnetic repulsive force acting on the movable contact 8 is increased by the spring force of the contact pressure spring 17. May exceed. In the present embodiment, as a measure against such an electromagnetic repulsion, a current flowing through the bus bar 22 and the first yoke 6 and the second yoke 7 are used.

For example, when the current I1 flows from the fixed terminal 31 to the fixed terminal 32 in the contact device 1, the current I1 flows to the right in the movable contact 8, so that when viewed from the right (the fixed terminal 31 is When viewed, a counterclockwise magnetic flux φ1 is generated around the movable contact 8 (see FIG. 4). That is, when viewed from the front, in the second yoke 7, the magnetic flux φ1 passes from the front to the rear (see FIG. 5).

At this time, as described above, the front end surfaces of the front end portion 61 and the protruding portion 73 of the first yoke 6 become the N pole, and the rear end portion 62 and the front end surface of the protruding portion 72 become the S pole. A suction force acts between the first yoke 6 and the second yoke 7. Since the first yoke 6 is fixed to the distal end (upper end) of the shaft 15, when the mover 13 is at the excitation position, the second yoke 7 is drawn upward by the above-mentioned attractive force. When the second yoke 7 is pulled upward, an upward force acts on the movable contact 8 from the second yoke 7, and as a result, a force that pushes up the movable contact 8, that is, the movable contacts 81 and 82. Is increased against the fixed contacts 311 and 321.

Furthermore, in the contact device 1 according to the present embodiment, the bus bar 22 includes the electric path piece 224 in which the current I1 flows in the direction opposite to the direction in which the current I1 flows in the movable contact 8, and the direction in which the current I1 flows in the movable contact 8. And a conductor piece 226 through which the current I1 flows in the same direction as that of the electric circuit piece 226. Further, the electric circuit piece 224 and the electric circuit piece 226 are connected via the electric circuit piece 225 so that the hollow portion 500 is formed.

Therefore, when a large current (an abnormal current) such as a short-circuit current flows through the contact device 1, the current flows through the conductor pieces 224 and 226 to generate a magnetic flux φ2 passing through the hollow portion 500. For example, when the current I1 flows in the direction illustrated in FIGS. 4 and 5, the magnetic flux φ2 passes through the hollow portion 500 from the front to the rear. The magnetic flux φ 2 passing through the hollow portion 500 passes through the second yoke 7.

Furthermore, the direction of the current I1 flowing in the electric circuit piece 224 is opposite to the direction of the current I1 flowing in the electric circuit piece 226. Therefore, due to the action of the magnetic flux generated by the electric circuit piece 224 and the magnetic flux generated by the electric circuit piece 226, the current I1 flowing through the electric circuit piece 224 and the current I1 flowing through the electric circuit piece 226 repel each other. As a result, in the electric path piece 224, the distribution of the current I1 increases toward the lower end 252 of the both ends 251 and 252 of the electric path piece 224 in the vertical direction (the moving direction of the movable contact 8) (that is, the current Higher density). In the electric path piece 226, the distribution of the current I1 increases toward the upper end 242 of the both ends 241 and 242 of the electric path piece 226 in the vertical direction (the moving direction of the movable contact 8) (that is, the current density is high). Become). Further, since the bus bar 22 is formed of copper as an example, it is a non-magnetic material. Therefore, not only the hollow portion 500 but also the upper end 251 of both ends 251 and 252 of the electric circuit piece 224 in the vertical direction and the lower end 241 of both ends 241 and 242 of the electric circuit piece 226 in the vertical direction. The magnetic flux φ2 passes. Therefore, the magnetic flux φ2 passes through a wide range including the movable contact 8. That is, since the portion through which the magnetic flux φ2 passes is not limited to the hollow portion 500, for example, the width of the electric circuit pieces 224 and 226 may be increased and the width of the hollow portion 500 may be reduced. At this time, a larger current can flow through the electric circuit pieces 224 and 226.

At this time, an upward Lorentz force is generated in the movable contact 8 due to the current I1 flowing through the movable contact 8 and the magnetic flux φ2. As a result, the force for pushing the movable contact 8 upward increases.

Furthermore, the direction of the magnetic flux φ1 passing below the movable contact 8 in the second yoke 7 is the same as the direction of the magnetic flux φ2 passing through the hollow portion 500. Therefore, the magnetic flux passing below the movable contact 8 increases, so that the attractive force between the first yoke 6 and the second yoke 7 also increases. As a result, the force for pushing the movable contact 8 upward increases.

Therefore, even when an abnormal current such as a short-circuit current flows through the contact device 1, the connection state between the movable contacts 81 and 82 and the fixed contacts 311 and 321 can be stabilized.

In the present embodiment, at least a part of the electric path piece 226 overlaps with the movable contact 8 as viewed from one side in the front-rear direction when the movable contact 8 is located at the closed position. That is, when the movable contact 8 is located at the closed position, the electric path piece 224 is located below the movable contact 8 when viewed from one side in the front-rear direction. Furthermore, the direction of the current I1 flowing through the movable contact 8 is opposite to the direction of the current I1 flowing through the electric path piece 224. Therefore, a force (repulsive force) in a direction away from each other is generated between the movable contact 8 and the electric circuit piece 224. At this time, since the electric circuit piece 224 is fixed, it does not move relatively to the housing 4. On the other hand, the movable contact 8 is vertically movable with respect to the housing 4. Therefore, a vertical force component of the repulsive force is applied to the movable contact 8. As a result, the force for pushing the movable contact 8 upward, that is, the force for pushing the movable contacts 81 and 82 against the fixed contacts 311 and 321 increases.

Therefore, by providing the electric path piece 224, even when an abnormal current such as a short-circuit current flows in the contact device 1, the connection state between the movable contacts 81 and 82 and the fixed contacts 311 and 321 can be stabilized. Can be.

Further, in the contact device 1 according to the present embodiment, the bus bar 22 is an electric circuit piece extending along a tangential direction of a part 141 in a circumferential direction of the exciting coil 14 when viewed from one side (above) in the axial direction of the exciting coil 14. 224. Here, the direction of the current I1 flowing through the electric circuit piece 224 is the same as the direction of the current I2 flowing through a part 141 of the circumferential direction of the exciting coil 14 (the part closest to the electric circuit piece 224) when the exciting coil 14 is energized. Therefore, of the magnetic flux φ2 generated by the current I1 flowing through the electric path piece 224 (see FIG. 5), the magnetic flux φ21 passing through the mover 13 causes the magnetic flux 13 generated by the current I2 flowing through the exciting coil 14 to the mover 13 of the electromagnet device 10. Acts in the same direction as φ22 (see FIGS. 6A and 6B). In other words, the magnetic flux φ21 generated by the current I1 flowing through the electric path piece 224 causes the movable element 13 to maintain the movable element 13 at the excitation position in the same manner as the force (magnetic force) generated by the excitation coil 14 when the excitation coil 14 is energized. Act. As described above, in the normally-off type electromagnetic relay 100, when the contact device 1 is in the closed state, the force in the direction for maintaining the mover 13 at the excitation position is caused by the magnetic field generated by the current flowing through the electric path piece 225. Acts on 13.

In the present embodiment, the magnetic flux φ22 generated by the current I2 flowing through the exciting coil 14 passes downward through the mover 13 and the stator 12, thereby generating a magnetic attraction between the mover 13 and the stator 12. Let it. Accordingly, the magnetic flux φ21 generated by the current I1 flowing through the electric path piece 224 generates an auxiliary force, and assists (assists) the driving force of the electromagnet device 10 for switching the contact device 1 from the open state to the closed state with the auxiliary force. Will be. The “auxiliary force” in the present disclosure means a force acting on the mover 13 by a magnetic field generated by the current I1 flowing through the electric circuit piece 224.

As a result, the force for attracting the mover 13 to the stator 12, that is, the force for pressing the mover 13 against the stator 12 is increased by the auxiliary force. In other words, when the contact device 1 is in the closed state, the mover 13 is maintained at the position where the contact device 1 is closed (the excitation position in the present embodiment) by the magnetic flux φ21 generated by the current flowing through the electric circuit piece 224. The direction force acts on the mover 13. The bus bar 22 and the electromagnet device 10 are arranged so as to have such a positional relationship.

In addition, in the present embodiment, the direction in which the electric path piece 224 extends (the left-right direction) is orthogonal to the moving direction of the mover 13 (the up-down direction). Thus, the auxiliary force generated by the current I1 flowing through the electric circuit piece 224 acts efficiently in the moving direction of the mover 13.

Therefore, the force for maintaining the mover 13 at the position where the contact device 1 is closed can be improved. For example, when an abnormal current such as a short-circuit current flows through the contact device 1, the auxiliary force becomes particularly large. Therefore, the movable element 13 is stably moved to the position where the contact device 1 is closed (the excitation position in the present embodiment). Can be maintained.

As described above, the contact device 1 according to the present embodiment includes the fixed terminals 31 and 32 having the fixed contacts 311 and 321, the movable contact 8, the reverse-direction path piece (the path piece 224), and the forward-direction path piece ( Circuit piece 226). The movable contact 8 has movable contacts 81 and 82, and is between a closed position where the movable contacts 81 and 82 contact the fixed contacts 311 and 321 and an open position where the movable contacts 81 and 82 are separated from the fixed contacts 311 and 321. Move with. At least one of the reverse direction electric path piece and the forward direction electric path piece is electrically connected to the fixed terminal 32. A current flows in a first direction from one end of the movable contact 8 to the other end. The reverse direction electric path piece and the forward direction electric path piece are arranged on the same side with respect to the movable contact 8 when viewed from the moving direction of the movable contact 8. The reverse-direction electric path piece extends in the direction of the current flowing through the movable contact 8 (first direction). When the position of the movable contact 8 is the closed position, the reverse direction electric path piece has a second direction orthogonal to both the moving direction of the movable contact 8 and the direction of the current flowing through the movable contact 8 (first direction). The movable contact 8 is disposed so that at least a part thereof is located on the opposite side of the fixed contacts 311 and 321 with respect to the movable contact 8. In the reverse direction electric path piece, a current flows in the third direction from the other end of the movable contact 8 to one end. The forward-direction electric path piece extends in the direction of the current flowing through the movable contact 8 (first direction). When the position of the movable contact 8 is the closed position, the forward direction electric path piece has a second direction orthogonal to both the moving direction of the movable contact 8 and the direction of the current flowing through the movable contact 8 (first direction). When viewed from above, at least a part of the movable contact 8 is disposed on the same side as the fixed contacts 311 and 321. In the forward electric path piece, a current flows in a first direction from one end of the movable contact 8 to the other end. When the position of the movable contact 8 is the closed position, the reverse direction electric path piece is moved from the second direction orthogonal to both the moving direction of the movable contact 8 and the direction of the current flowing through the movable contact 8 (first direction). When viewed, it overlaps the movable contact 8. The reverse-direction electric path piece overlaps at least the end 86 of the both ends 85 and 86 in the moving direction of the movable contact 8 that is far from the fixed contacts 311 and 321.

According to this configuration, it is possible to stabilize the connection between the movable contacts 81 and 82 and the fixed contacts 311 and 321 when an abnormal current flows.

(4) Modifications Modifications will be listed below. The modifications described below can be applied in appropriate combinations with the above embodiments.

(4.1) First Modification In the contact device 1 of the above embodiment, when the movable contact 8 is located at the closed position, the movable contact 8 is at least one of the electric path pieces 226 when viewed from one side in the front-rear direction. Although the movable contact 8 partially overlaps with the movable contact 8, the present invention is not limited to this configuration.

For example, as shown in FIG. 7, when the movable contact 8 is located at the closed position, the contact device 1 has the movable contact 8 in contact with at least a part of the electric path piece 224 when viewed from one side in the front-rear direction. It is good also as composition which child 8 overlaps.

For example, when the position of the movable contact 8 is the closed position, when viewed from one side in the front-rear direction, the electric path piece 224 is at least one of the two ends 85 and 86 of the movable contact 8 in the moving direction of the movable contact 8. It may overlap with an end (lower end) 86 far from the fixed contacts 311 and 321. That is, the electric circuit piece 224 may be arranged so that the lower end portion 86 of the movable contact 8 is located within the range R2 between the upper edge of the electric circuit piece 224 and the lower edge of the electric circuit piece 224. In this modification, as shown in FIG. 7, of the two ends 251 and 252 of the electric circuit piece 224 in the vertical direction, an end 251 near the electric circuit piece 226 overlaps the movable contact 8.

In this modification, it is desirable that the first yoke 6 and the second yoke 7 are not provided.

In this case as well, similarly to the embodiment, the magnetic flux passing through the hollow portion 500 is generated by the current flowing through the electric circuit piece 224 and the electric circuit piece 226. Further, also in this case, as in the embodiment, the distribution of the current I1 on the side of the end 252 of the electric path piece 224 in the electric path piece 224 increases (that is, the current density increases). In the circuit piece 226, the distribution of the current I1 increases toward the end 242 (that is, the current density increases). Further, also in this modification, the bus bar 22 is a non-magnetic material because it is formed of copper as an example. Therefore, the generated magnetic flux passes not only through the hollow portion 500 but also through the end 251 of the electric circuit piece 224 and the end 241 of the electric circuit piece 226. Therefore, the generated magnetic flux passes above the movable contact 8 in a wider range. Therefore, an upward Lorentz force is generated by the current flowing through the movable contact 8 and the magnetic flux. As a result, the force for pushing the movable contact 8 upward increases.

(4.2) Second Modification In the above-described embodiment, the current I1 flowing through the movable contact 8 is arranged on the same side as the movable contact 8 when viewed from one side of the moving direction of the movable contact 8. The bus bar 22 has a configuration in which the bus bar 22 has an electric path piece 226 in which a current flows in the same direction as the direction. However, it is not limited to this configuration.

The bus bar 21 forms an electric path piece that is disposed on the same side as the movable contact 8 when viewed from one of the moving directions of the movable contact 8 and in which a current flows in the same direction as the direction of the current I1 flowing through the movable contact 8. May have.

Hereinafter, the bus bars 21a and 22a according to the present modification will be described.

The bus bars 21a and 22a are made of a conductive metal material (for example, copper or a copper alloy). In this modification, the bus bars 21 and 22 are made of copper as an example. The bus bars 21a and 22a are formed in a strip shape. In this modification, the bus bars 21a and 22a are formed by bending a metal plate. One end of the bus bar 21a is electrically connected to, for example, the fixed terminal 31. The other end of the bus bar 21a is electrically connected to, for example, a running battery. One end of the bus bar 22a is electrically connected to the fixed terminal 32, for example. The other end of the bus bar 22a is electrically connected to, for example, a load.

The bus bar 21a includes seven electric path pieces 211a to 217a (see FIGS. 8A and 8B).

The electric circuit piece 211a is mechanically connected to the fixed terminal 31. Specifically, the electric circuit piece 211a has a substantially rectangular shape in plan view, and is caulked to the fixed terminal 31 at the caulked portion 35 of the fixed terminal 31. The electric circuit piece 212a is connected to the electric circuit piece 211a, and is arranged behind the cover 50 so as to extend downward from the rear end of the electric circuit piece 211a.

The electric circuit piece 213a is connected to the electric circuit piece 212a, and is disposed behind the cover 50 so as to extend rightward from the lower end of the electric circuit piece 212a (toward the fixed terminal 32 when viewed from the fixed terminal 31). Here, the electric circuit piece 213a is preferably arranged above the yoke upper plate 111 and below the movable contact 8 when the movable contact 8 is located at the closed position.

The electric circuit piece 214a is connected to the electric circuit piece 213a, and is disposed on the right side of the cover 50 so as to extend forward from the right end of the electric circuit piece 213a. The electric circuit piece 215a is connected to the electric circuit piece 214a, and is disposed on the right side of the cover 50 so as to extend upward from the front end of the electric circuit piece 214a. The electric circuit piece 216a is connected to the electric circuit piece 215a, and is disposed on the right side of the cover 50 so as to extend forward from the left end of the electric circuit piece 215a.

The electric circuit piece 217a (forward electric circuit piece) is connected to the electric circuit piece 216a, and extends forward from the front end of the electric circuit piece 216a to the left (toward the fixed terminal 31 when viewed from the fixed terminal 32). Are located in The thickness direction (front-back direction) of the electric circuit piece 217a is orthogonal to the moving direction (up-down direction) of the movable contact 8.

The bus bar 22a includes four electric path pieces 221a to 224a (see FIGS. 8A and 8B).

The electric circuit piece 221a is mechanically connected to the fixed terminal 32. Specifically, the electric circuit piece 221 a has a substantially rectangular shape in plan view, and is caulked to the fixed terminal 32 at the caulked portion 36 of the fixed terminal 32.

The electric circuit piece 222a is connected to the electric circuit piece 221a, and is disposed on the right side of the cover 50 so as to extend downward from the right end of the electric circuit piece 221a. The electric circuit piece 223a is connected to the electric circuit piece 222a, and is disposed on the right side of the cover 50 so as to extend forward from the lower end of the electric circuit piece 222a.

The electric circuit piece 224a (reverse electric circuit piece) is connected to the electric circuit piece 223a, and extends forward from the front end of the electric circuit piece 223a to the left (toward the fixed terminal 31 when viewed from the fixed terminal 32). Are located in In this modification, a part of the electric circuit piece 224a is located on the exciting coil 14 side with respect to the yoke upper plate 111 when viewed from one side in the front-rear direction. The electric path piece 224a may be arranged above the yoke upper plate 111 and below the movable contact 8 when the movable contact 8 is located at the closed position.

In this modification, the electric circuit pieces 217a and 224a are arranged on the same side (here, the front side) with respect to the movable contact 8 as viewed from one of the moving directions (up and down directions) of the movable contact 8.

Here, when the movable contact 8 is located at the closed position, when the movable contact 8 is located in the front-back direction (a direction orthogonal to both the moving direction of the movable contact 8 and the direction of the current flowing through the movable contact 8), The contact 8 overlaps at least a part of the electric path piece 217 a with the movable contact 8. Also in the present modified example, similarly to the embodiment, the electric circuit piece 217a is arranged such that the upper end 85 of the movable contact 8 is located within the range between the upper edge of the electric circuit piece 217a and the lower edge of the electric circuit piece 217a. ing. In the present modified example, of the both ends of the electric circuit piece 217a in the vertical direction, the end closer to the electric circuit piece 224a overlaps the movable contact 8.

少 な く と も At least a part of the electric circuit piece 224a overlaps with the yoke upper plate 111 or is located on the exciting coil 14 side with respect to the yoke upper plate 111.

Furthermore, the length of the electric circuit piece 224a and the length of the electric circuit piece 217a are each equal to or greater than the distance between the movable contact 81 and the movable contact 82. Here, the distance between the movable contact 81 and the movable contact 82 is the shortest distance between the movable contact 81 and the movable contact 82 as viewed in the front-rear direction, as in the embodiment.

(4) It is assumed that a current I1 flows through the movable contact 8 from the fixed terminal 31 to the fixed terminal 32. At this time, the current I1 is determined by the electric circuit piece 217a, the electric circuit piece 216a, the electric circuit piece 215a, the electric circuit piece 214a, the electric circuit piece 213a, the electric circuit piece 212a6, the electric circuit piece 211a, the fixed terminal 31, the movable contact 8, the fixed terminal 32, the electric circuit piece. 221a, the electric circuit piece 222a, the electric circuit piece 223a, and the electric circuit piece 224a flow in this order (see FIG. 8B). In the circuit piece 224a, the current I1 flows from right to left (the fixed terminal 31 side as viewed from the fixed terminal 32), and in the circuit piece 217a, the current I1 flows from left to right (the fixed terminal 32 side as viewed from the fixed terminal 31). ). On the other hand, in the movable contact 8, the current I1 flows from left to right. Conversely, when the current I1 flows through the movable contact 8 from the fixed terminal 32 to the fixed terminal 31, the current I1 flows from the left to the right (the fixed terminal 32 side when viewed from the fixed terminal 31) in the electric circuit piece 224a. On the other hand, the current I1 flows from the right side to the left side (the fixed terminal 31 side when viewed from the fixed terminal 32) in the electric circuit piece 217a.

That is, the direction of the current I1 flowing through the movable contact 8 is the same as the direction of the current I1 flowing through the electric path piece 217a. On the other hand, the direction of the current I1 flowing through the movable contact 8 is opposite to the direction of the current I1 flowing through the electric path piece 224a.

Also in this modification, the electric circuit piece 224a extends along a part of the tangential direction of the circumferential direction of the exciting coil 14 when viewed from one side in the axial direction of the exciting coil 14. Here, the direction of the current I1 flowing through the electric circuit piece 224a is the same as the current I2 flowing through a part of the circumferential direction of the exciting coil 14 (the part closest to the electric circuit piece 224a) when the exciting coil 14 is energized.

向 き Also, the direction of the current I1 flowing through the circuit piece 213a is the same as the direction of the current I1 flowing through the circuit piece 224a. In the present modification, similarly to the embodiment, when the movable contact 8 is located at the closed position, the electric path piece 224a is located below the movable contact 8 when viewed from one side in the front-rear direction. Furthermore, the direction of the current I1 flowing through the movable contact 8 is opposite to the direction of the current I1 flowing through the electric path piece 224a. Therefore, a repulsive force is generated between the movable contact 8 and the electric circuit piece 224a, so that the force for pushing the movable contact 8 upward, that is, the force for pressing the movable contacts 81 and 82 against the fixed contacts 311 and 321 increases. Further, since the direction of the current I1 flowing through the electric circuit piece 213a and the direction of the current I1 flowing through the electric circuit piece 224a are the same, a repulsive force is also generated between the movable contact 8 and the electric circuit piece 213a. As a result, the force for pushing the movable contact 8 upward, that is, the force for pushing the movable contacts 81 and 82 against the fixed contacts 311 and 321 is further increased. Therefore, by providing the electric circuit pieces 213a and 224a, even when an abnormal current such as a short-circuit current flows in the contact device 1, the connection state between the movable contacts 81 and 82 and the fixed contacts 311 and 321 can be stabilized. Can be planned.

Note that one of the electric circuit piece 224a and the electric circuit piece 217a may be formed by a bus bar provided in another contact device. In other words, at least one of the electric circuit piece 224a and the electric circuit piece 217a may be electrically connected to the fixed terminal of the contact device 1.

(4.3) Third Modification In the electromagnetic relay 100 of the above embodiment, the electromagnet device 10 has a configuration in which the fixed contacts 311 and 321 are disposed on the opposite side to the movable contact 8 in the vertical direction. However, the present invention is not limited to this configuration.

The electromagnet device 10 may be arranged on the same side as the fixed contacts 311 and 321 with respect to the movable contact 8 in the up-down direction. Hereinafter, the electromagnetic relay 100 according to the present modification will be described. Here, at least a part (the yoke upper plate 111) of the yoke 11 of this modification is located between the exciting coil 14 and the fixed contacts 311 and 321.

FIG. 9 is a cross-sectional view of the electromagnetic relay 100 according to this modification. In FIG. 9, the housing 4, the flange 5, the capsule yokes 23 and 24, the arc-extinguishing magnets 25 and 26, the insulating plate 41, the cover 50, and the contact pressure spring 17 described in the above embodiment are omitted. I have. In this modification, it is preferable that the first yoke 6 and the second yoke 7 are not provided, as in the first modification.

可 動 The movable contact 8 of this modification is disposed above the fixed contacts 311 and 321 (see FIG. 9).

In the electromagnetic relay 100 of this modification, the electromagnet device 10 is disposed on the same side as the fixed contacts 311 and 321 with respect to the movable contact 8 in the vertical direction.

固定 The stator 12 included in the electromagnet device 10 of the present modification is a fixed iron core formed in a columnar shape. One end of the stator 12 is fixed to the cylindrical body 16.

可 動 The mover 13 included in the electromagnet device 10 of this modification is a movable iron core formed in a columnar shape. A recess is provided below the mover 13. The mover 13 is disposed above the stator 12 so as to face the stator 12. The mover 13 moves between the excitation position and the non-excitation position as in the first embodiment.

復 帰 The return spring 18 of this modification is arranged in a concave portion of the mover 13. The return spring 18 is a coil spring that biases the mover 13 to the non-excited position. One end of the return spring 18 is connected to one end surface of the concave portion of the mover 13, and the other end of the return spring 18 is connected to the stator 12 (see FIG. 9).

シ ャ フ ト The shaft 15 of this modification is made of a non-magnetic material. The shaft 15 is formed in a round bar shape extending vertically. One end of the shaft 15 is fixed to the lower end of the mover 13. For example, the tip of the shaft 15 contacts the movable contact 8 when the excitation coil 14 is not energized, and does not contact the movable contact 8 when the excitation coil 14 is energized. In the present embodiment, when the excitation coil 14 is energized, the shaft 15 moves downward and does not contact the movable contact 8. At this time, the movable contact 8 comes into contact with the fixed contacts 311 and 321 by the action of the contact pressure spring (not shown in FIG. 9).

With this configuration, as the mover 13 of the electromagnet device 10 of the present modification moves up and down using the driving force generated by the electromagnet device 10 of the present modification, the contact device 1 of the present modification moves The contact 8 moves up and down.

バ ス The bus bar 22 of the present modification includes seven electric circuit pieces 221 to 227 as in the first embodiment.

The electric circuit piece 221 is mechanically connected to the fixed terminal 32. The electric circuit piece 222 is connected to the electric circuit piece 221 and is arranged to extend upward from the right end of the electric circuit piece 221. The electric circuit piece 223 is connected to the electric circuit piece 222 and is arranged to extend forward from the upper end of the electric circuit piece 222.

The electric circuit piece 224 (reverse electric circuit piece) is connected to the electric circuit piece 223 and is arranged to extend leftward (to the fixed terminal 31 side as viewed from the fixed terminal 32) from the front end of the electric circuit piece 223.

The circuit piece 225 (connection circuit piece) is connected to the circuit piece 224 and is arranged to extend downward from the left end of the circuit piece 224.

The electric circuit piece 226 (forward electric circuit piece) is connected to the electric circuit piece 225 and is disposed so as to extend rightward from the lower end of the electric circuit piece 225 (to the fixed terminal 32 when viewed from the fixed terminal 31).

The electric circuit piece 227 is connected to the electric circuit piece 226 and is disposed so as to extend forward from the right end of the electric circuit piece 225.

In this modification, similarly to the above-described embodiment, the electric path pieces 224 to 226 are on the same side (here, the front side) with respect to the movable contact 8 when viewed from one of the moving directions (up and down directions) of the movable contact 8. ).

Also, in this modified example, similarly to the above-described embodiment, a hollow portion 500 exists between the electric circuit piece 224 and the electric circuit piece 226 (see FIG. 9).

Further, in this modification, a part of the electric circuit piece 226 is located on the exciting coil 14 side with respect to the yoke upper plate 111 of the yoke 11 described later when viewed from one side in the front-rear direction (see FIG. 9). ). That is, a part of the electric path piece 226 overlaps with the yoke upper plate 111 or is located on the exciting coil 14 side with respect to the yoke upper plate 111. Further, all of the electric path pieces 226 may be located on the exciting coil 14 side with respect to the yoke upper plate 111 when viewed from one side in the front-rear direction. Therefore, at least a part of the electric circuit piece 226 only needs to overlap the yoke upper plate 111 or be located on the excitation coil 14 side with respect to the yoke upper plate 111.

In this modification, it is assumed that a current flows through the movable contact 8 from the fixed terminal 31 to the fixed terminal 32. At this time, the current flows through the bus bar 21, the fixed terminal 31, the movable contact 8, the fixed terminal 32, the circuit piece 221, the circuit piece 222, the circuit piece 223, the circuit piece 224, the circuit piece 225, the circuit piece 226, and the circuit piece 227. Flow in order. In the circuit piece 224 of this modification, the current flows from right to left (the fixed terminal 31 side as viewed from the fixed terminal 32), and in the circuit piece 226, the current flows from left to right (the fixed terminal as viewed from the fixed terminal 31). 32). On the other hand, in the movable contact 8, the current flows from left to right. Conversely, when the current I1 flows through the movable contact 8 from the fixed terminal 32 toward the fixed terminal 31, the current I1 flows from the left to the right (the fixed terminal 32 side when viewed from the fixed terminal 31) in the circuit path piece 224. On the other hand, the current I1 flows from the right side to the left side (the fixed terminal 31 side when viewed from the fixed terminal 32) in the conductor piece 226.

That is, in the present modification, similarly to the above embodiment, the direction of the current flowing through the movable contact 8 and the direction of the current flowing through the electric path piece 226 are the same. On the other hand, the direction of the current flowing through the movable contact 8 and the direction of the current flowing through the electric path piece 224 are opposite.

も Also in this modified example, similarly to the embodiment, a current flows through the electric circuit piece 224 and the electric circuit piece 226 to generate a magnetic flux passing through the hollow portion 500 from the rear to the front. Further, in the electric circuit piece 224, the current distribution increases toward the end 252 of the electric circuit piece 224 (that is, the current density increases). In the circuit path piece 226, the current distribution increases toward the end 242 (that is, the current density increases). Further, the generated magnetic flux passes not only through the hollow portion 500 but also through the end 251 of the electric circuit piece 224 and the end 241 of the electric circuit piece 226. Therefore, the generated magnetic flux passes below the movable contact 8 in a wider range. Therefore, a downward Lorentz force is generated by the current flowing through the movable contact 8 and the magnetic flux. Thereby, the force for pressing the movable contact 8 downward increases.

In this modification, the electric circuit piece 226 extends along a part of the tangential direction in the circumferential direction of the exciting coil 14 when viewed from one side (above) of the exciting coil 14 in the axial direction. The direction of the flowing current is preferably the same as the direction of the current flowing through a part of the exciting coil 14 in the circumferential direction.

Also in this case, the magnetic flux generated by the current flowing through the electric path piece 226 generates an auxiliary force, and the driving force of the electromagnet device 10 for switching the contact device 1 from the open state to the closed state is assisted by the auxiliary force (assist). It is possible to do.

(4.4) Fourth Modified Example In a third modified example, when the position of the movable contact 8 is the closed position, the electric path piece 224 overlaps with the movable contact 8 when viewed from one side in the front-rear direction. Although the configuration is adopted, the present invention is not limited to this configuration.

と き に When the position of the movable contact 8 is the closed position, the electric path piece 226 may overlap the movable contact 8 when viewed from one side in the front-rear direction. That is, when the position of the movable contact 8 is the closed position, when viewed from one side in the front-rear direction, the electric path piece 224 is at least one of the two ends 85 and 86 of the movable contact 8 in the moving direction of the movable contact 8. It may overlap with the end 86 far from the fixed contacts 311 and 321. For example, of the two ends 251 and 252 of the electric circuit piece 224 in the vertical direction, an end 251 close to the electric circuit piece 226 may overlap the movable contact 8.

In this case as well, similarly to the embodiment, a magnetic flux that passes from the back to the front through the hollow portion 500 is generated by the current flowing through the electric circuit piece 224 and the electric circuit piece 226. Further, in the electric circuit piece 224, the current distribution increases toward the end 252 of the electric circuit piece 224 (that is, the current density increases). In the circuit path piece 226, the current distribution increases toward the end 242 (that is, the current density increases). Further, the generated magnetic flux passes not only through the hollow portion 500 but also through the end 251 of the electric circuit piece 224 and the end 241 of the electric circuit piece 226. Therefore, the generated magnetic flux passes below the movable contact 8 in a wider range. Therefore, a downward Lorentz force is generated by the current flowing through the movable contact 8 and the magnetic flux. Thereby, the force for pressing the movable contact 8 downward increases.

As described above, the contact device 1 according to the present modification includes the fixed terminals 31 and 32 having the fixed contacts 311 and 321, the movable contact 8, the reverse-direction path piece (the path piece 224), and the forward-direction path piece ( Circuit piece 226). The movable contact 8 has movable contacts 81 and 82, and is between a closed position where the movable contacts 81 and 82 contact the fixed contacts 311 and 321 and an open position where the movable contacts 81 and 82 are separated from the fixed contacts 311 and 321. Move with. At least one of the reverse direction electric path piece and the forward direction electric path piece is electrically connected to the fixed terminal 32. A current flows in a first direction from one end of the movable contact 8 to the other end. The reverse direction electric path piece and the forward direction electric path piece are arranged on the same side with respect to the movable contact 8 when viewed from the moving direction of the movable contact 8. The reverse-direction electric path piece extends in the direction of the current flowing through the movable contact 8 (first direction). When the position of the movable contact 8 is the closed position, the reverse direction electric path piece has a second direction orthogonal to both the moving direction of the movable contact 8 and the direction of the current flowing through the movable contact 8 (first direction). The movable contact 8 is disposed so that at least a part thereof is located on the opposite side of the fixed contacts 311 and 321 with respect to the movable contact 8. In the reverse direction electric path piece, a current flows in the third direction from the other end of the movable contact 8 to one end. The forward-direction electric path piece extends in the direction of the current flowing through the movable contact 8 (first direction). When the position of the movable contact 8 is the closed position, the forward direction electric path piece has a second direction orthogonal to both the moving direction of the movable contact 8 and the direction of the current flowing through the movable contact 8 (first direction). When viewed from above, at least a part of the movable contact 8 is disposed on the same side as the fixed contacts 311 and 321. In the forward electric path piece, a current flows in a first direction from one end of the movable contact 8 to the other end. When the position of the movable contact 8 is the closed position, the forward direction electric path piece is moved from the second direction orthogonal to both the moving direction of the movable contact 8 and the direction of the current flowing through the movable contact 8 (first direction). When viewed, the movable contact 8 overlaps. The forward electric path piece overlaps at least the end 86 near the fixed contacts 311 and 321 of both ends 85 and 86 in the moving direction of the movable contact 8.

According to this configuration, it is possible to stabilize the connection between the movable contacts 81 and 82 and the fixed contacts 311 and 321 when an abnormal current flows.

(4.5) Other Modifications In the above embodiment, the electric circuit piece 225 (the connecting electric circuit piece) is positioned such that the electric circuit piece 225 (the moving direction of the movable contact 8) is Although the configuration is provided on the same side (that is, in front of the cover 50) of the electrical circuit piece 224 (reverse electrical circuit piece) and the electrical circuit piece 226 (forward electrical circuit piece), it is not limited to this configuration. The electric circuit piece 225 (connection electric circuit piece) may be arranged on the left side of the cover 50. In short, when viewed from one side in the vertical direction (moving direction of the movable contact 8), at least the electric path piece 224 (reverse direction electric path piece) and the electric path piece 226 (forward direction electric path piece) are the same as the movable contact 8 It should be on the side.

In the above embodiment, the bus bars 21 and 22 are provided outside the cover 50 of the contact device 1, but may be provided outside the housing 4. Although the bus bars 21 and 22 are configured to be provided outside the cover 50 and / or the housing 4, the configuration is not limited to this. At least some of the bus bars 21 and 22 may be provided inside the housing 4.

In the above embodiment, the electromagnetic relay 100 is a normally-off type electromagnetic relay, but may be a normally-on type electromagnetic relay.

In the above embodiment, the number of the movable contacts held by the movable contact 8 of the contact device 1 is two, but is not limited to this configuration. The number of movable contacts held by the movable contact 8 may be one, or three or more. Similarly, the number of fixed terminals (and fixed contacts) of the contact device 1 is not limited to two, and may be one or three or more.

The electromagnetic relay 100 according to the above-described embodiment is an electromagnetic relay without a holder, but is not limited to this configuration, and may be an electromagnetic relay with a holder. Here, the holder is, for example, a rectangular cylindrical shape having both sides opened in the left-right direction, and the holder is combined with the movable contact 8 so that the movable contact 8 penetrates the holder in the left-right direction. A contact pressure spring 17 is arranged between the lower wall of the holder and the movable contact 8. That is, the center of the movable contact 8 in the left-right direction is held by the holder. The upper end of the shaft 15 is fixed to the holder. When the excitation coil 14 is energized, the shaft 15 is pushed upward, so that the holder moves upward. Along with this movement, the movable contact 8 moves upward, and positions the pair of movable contacts 81 and 82 at the closed position where they come into contact with the pair of fixed contacts 311 and 321.

Although the contact device 1 of the above embodiment is a plunger type contact device, it may be a hinge type contact device.

Although the bus bar of the above embodiment is mechanically connected to the fixed terminals 31 and 32 by being caulked to the fixed terminals 31 and 32, it is mechanically connected to the fixed terminals 31 and 32 by screwing. Is also good.

In the contact device 1 of the above embodiment, the first yoke 6, the second yoke 7, the arc extinguishing magnets 25 and 26, and the capsule yokes 23 and 24 are not essential components.

In the above embodiment, each of the bus bars 21 and 22 is formed integrally by bending a metal plate, but the present invention is not limited to this configuration. The bus bars 21 and 22 may be formed by joining a plurality of metal plates by screwing or welding. Alternatively, a part such as a fuse may be interposed in a part of the bus bars 21 and 22. Also in these cases, the concept that the bus bars 21 and 22 are electrically connected to the contact device 1 is included.

(Summary)
As described above, the contact device (1) according to the first embodiment includes the fixed terminals (31, 32) having the fixed contacts (311, 321), the movable contact (8), and the reverse-direction electric path piece (for example, (A circuit piece 224) and a forward direction circuit piece (for example, a circuit piece 226). The movable contact (8) has a movable contact (81, 82), and a closed position where the movable contact (81, 82) contacts the fixed contact (311, 321) and the movable contact (81, 82) is a fixed contact. (311, 321) to move to an open position away from it. At least one of the reverse direction circuit piece and the forward direction circuit piece is electrically connected to the fixed terminal (32). A current flows in a first direction from one end of the movable contact (8) to the other end. The reverse direction electric path piece and the forward direction electric path piece are arranged on the same side with respect to the movable contact (8) when viewed from the moving direction of the movable contact (8). The reverse-direction electric path piece extends along the direction (first direction) of the current flowing through the movable contact (8). When the position of the movable contact (8) is the closed position, the reverse direction electric path piece has both the moving direction of the movable contact (8) and the direction of the current flowing through the movable contact (8) (first direction). When viewed from a second direction orthogonal to the movable contact (8), at least a part of the movable contact (8) is disposed on the opposite side to the fixed contacts (311, 321). In the reverse direction electric path piece, a current flows in the third direction from the other end of the movable contact (8) to one end. The forward-direction electric path piece extends along the direction (first direction) of the current flowing through the movable contact (8). When the position of the movable contact (8) is the closed position, the forward direction path piece has both the moving direction of the movable contact (8) and the direction of the current flowing through the movable contact (8) (first direction). When viewed from a second direction perpendicular to the movable contact (8), at least a part of the movable contact (8) is located on the same side as the fixed contacts (311, 321). In the forward electric path piece, a current flows in a first direction from one end of the movable contact (8) to the other end. When the position of the movable contact (8) is the closed position, one of the reverse direction circuit piece and the forward direction circuit piece changes the moving direction of the movable contact (8) and the movable contact (8). The movable contact (8) overlaps with the movable contact (8) when viewed from a second direction orthogonal to both directions of the flowing current (first direction). When the reverse direction electric path piece overlaps with the movable contact (8) when viewed from the second direction, the reverse direction electric path piece is located at both ends (85, 86) in the moving direction of the movable contact (8). Of these, at least the end (86) far from the fixed contacts (311, 321) overlaps. When the forward electric path piece overlaps with the movable contact (8) when viewed from the second direction, the forward electric path piece is provided at both ends (85, 86) in the moving direction of the movable contact (8). Of these, at least the end (86) near the fixed contact (311,321) overlaps.

According to this configuration, when a current flows through each of the reverse circuit piece and the forward circuit piece, the magnetic flux that strengthens the connection state between the movable contact and the fixed contact between the reverse circuit piece and the forward circuit piece (Φ2) occurs. Therefore, the connection state between the movable contacts (81, 82) and the fixed contacts (311, 321) when an abnormal current flows can be stabilized.

接点 The contact device (1) of the second aspect is the same as the first aspect, further comprising a connection circuit piece (for example, a circuit piece 225) for connecting the reverse circuit piece and the forward circuit piece.

According to this configuration, it is possible to reliably generate a magnetic flux (φ2) between the reverse direction electric path piece and the forward direction electric path piece. Further, the direction of the current flowing in the reverse direction circuit piece is opposite to the direction of the current flowing in the forward direction circuit piece. Therefore, due to the influence of the magnetic flux generated by the reverse direction circuit piece and the magnetic flux generated by the forward direction circuit piece, the current flowing in the reverse direction circuit piece and the current flowing in the forward direction circuit piece repel each other. As a result, the magnetic flux (φ2) generated between the reverse direction electric path piece and the forward direction electric path piece passes through a wider area, so that the connection state between the movable contact and the fixed contact can be further strengthened.

In the contact device (1) according to a third aspect, in the second aspect, the connecting electric path piece is provided with the reverse electric path piece and the reverse electric path piece with respect to the movable contact (8) when viewed from the moving direction of the movable contact (8). It is arranged on the same side as the forward electric circuit piece.

According to this configuration, it is possible to reliably generate a magnetic flux (φ2) between the reverse direction electric path piece and the forward direction electric path piece.

接点 A contact device (1) according to a fourth aspect is the contact device according to any of the first to third aspects, further comprising a first yoke (6) and a second yoke (7). The first yoke (6) is located on the same side of the movable contact (8) as the side where the fixed contacts (311 and 321) exist in the moving direction of the movable contact (8). The second yoke (7) is located on the side opposite to the side where the fixed contacts (311 and 321) exist with respect to the movable contact (8) in the moving direction of the movable contact (8). The magnetic flux (φ2) generated by the current passing through the reverse direction path piece and the forward direction path piece is changed to the second direction in the same direction as the direction of the magnetic flux (φ1) generated in the second yoke (7) by the current flowing through the movable contact (8). Pass through the yoke (7).

According to this configuration, since the magnetic flux (φ2) passes through the second yoke in addition to the magnetic flux (φ1), the magnetic flux passing below the movable contact 8 increases. Therefore, the suction force between the first yoke (6) and the second yoke (7) also increases. As a result, the force for pushing the movable contact 8 upward increases.

The contact device (1) according to a fifth aspect is the contact device according to any one of the first to fourth aspects, further comprising a housing (4) that houses the fixed contacts (311 and 321) and the movable contact (8). . The reverse direction electric path piece and the forward direction electric path piece are arranged outside the housing (4).

According to this configuration, it is possible to increase the degree of freedom in the arrangement of the reverse circuit piece and the forward circuit piece, and the connection state between the movable contact and the fixed contact between the reverse circuit piece and the forward circuit piece. Can be generated.

接点 The contact device (1) according to the sixth aspect is, in any one of the first to fifth aspects, further provided with a bus bar (for example, the bus bar 22) including a reverse path piece and a forward path piece. The bus bar (22) is mechanically connected to the fixed terminal (32).

According to this configuration, it is possible to generate a magnetic flux (φ2) between the reverse direction path piece and the forward direction path piece by using the current flowing through the single contact device.

In the contact device (1) according to a seventh aspect, in any one of the first to sixth aspects, when the position of the movable contact (8) is the closed position, the moving direction of the movable contact (8) and Both ends (ends 251 and 252) of the reverse-direction electric path piece in the moving direction of the movable contact (8) when viewed from a second direction orthogonal to both directions (first directions) of the current flowing through the movable contact (8). In (), the end (251) near the forward-direction electric path piece overlaps the movable contact (8). Alternatively, when the position of the movable contact (8) is the closed position, the second direction orthogonal to both the moving direction of the movable contact (8) and the direction of the current flowing through the movable contact (8) (first direction). When viewed from two directions, of the two ends (ends 241 and 242) of the forward electrical path piece in the moving direction of the movable contact (8), the end (241) near the reverse electrical path piece is the movable contact (8). Overlaps.

According to this configuration, since the direction of the current flowing in the reverse circuit piece and the direction of the current flowing in the forward circuit piece are opposite, the current flowing in the reverse circuit piece and the current flowing in the forward circuit piece are different from each other. Repel each other. When viewed from a direction orthogonal to both the moving direction of the movable contact (8) and the direction (first direction) of the current flowing through the movable contact (8), a part of the reverse circuit piece or a part of the forward circuit is formed. By overlapping the movable contact (8), a portion that does not overlap with the movable contact (8) can be close to the movable contact (8), and a large amount of current can flow through the portion. Therefore, the connection state between the movable contact and the fixed contact can be strengthened.

The electromagnetic relay (100) according to the eighth aspect includes the contact device (1) according to any one of the first to seventh aspects, and an electromagnet device (10) for moving the movable contact (8). The electromagnet device (10) has an exciting coil (14) and a yoke (11) forming a part of a path of a magnetic flux generated in the exciting coil (14).

According to this configuration, it is possible to stabilize the connection state between the movable contacts (81, 82) and the fixed contacts (311, 321) when an abnormal current flows through the contact device (1).

In an electromagnetic relay (100) according to a ninth aspect, in the eighth aspect, the electromagnet device (10) is disposed on the opposite side of the movable contact (8) from the fixed contacts (311, 321). . Part of the yoke (11) (the yoke upper plate 111) exists between the exciting coil (14) and the movable contact (8). At least a part of the reverse-direction electric path piece has a yoke as viewed from a second direction orthogonal to both the moving direction of the movable contact (8) and the direction (first direction) of the current flowing through the movable contact (8). 11), or is located on the exciting coil (14) side with respect to the part of the yoke (11).

According to this configuration, the magnetic flux generated in the exciting coil (14) can be further strengthened.

In the electromagnetic relay (100) according to the tenth aspect, in the eighth or ninth aspect, the reverse electric path piece is a part of a circumferential direction of the exciting coil (14) when viewed from an axial direction of the exciting coil (14). It extends along the tangential direction (D1) of (141). The direction of the first current as the current flowing in the reverse direction path piece is the same as the direction of the second current flowing through a part (141) of the exciting coil (14) in the circumferential direction when the exciting coil (14) is energized. .

According to this configuration, the magnetic flux generated in the exciting coil (14) can be further strengthened.

In the electromagnetic relay (100) according to the eleventh aspect, in the eighth aspect, the electromagnet device (10) is disposed on the same side as the fixed contacts (311, 321) with respect to the movable contact (8). A part (the yoke upper plate 111) of the yoke (11) exists between the exciting coil (14) and the fixed contacts (311, 321). At least a part of the forward-direction electric path piece has a yoke as viewed from a second direction orthogonal to both the moving direction of the movable contact (8) and the direction (first direction) of the current flowing through the movable contact (8). 11) or a part of the yoke (11) with respect to the exciting coil (14).

According to this configuration, the magnetic flux generated in the exciting coil (14) can be further strengthened.

In the electromagnetic relay (100) according to the twelfth aspect, in the eighth or eleventh aspect, the forward electric path piece includes a part in the circumferential direction of the exciting coil (14) as viewed from the axial direction of the exciting coil (14). Extend along the tangential direction of The direction of the current flowing in the forward-direction electric path piece is the same as the direction of the current flowing in a part of the circumferential direction of the exciting coil (14) when the exciting coil (14) is energized.

According to this configuration, the magnetic flux generated in the exciting coil (14) can be further strengthened.

In the electromagnetic relay (100) according to the thirteenth aspect, in any one of the ninth to twelfth aspects, the electromagnet device (10) includes a stator (12) and a mover (13). The mover (13) moves between an excitation position in contact with the stator (12) and a non-excitation position away from the stator (12) in accordance with energization and de-energization of the current to the excitation coil (14). . The stator (12) and the mover (13) are arranged inside the opening of the exciting coil (14). One of the forward-direction path piece and the reverse-direction path piece is arranged such that the current flowing through the one-way path piece increases the attraction force of the mover (13) contacting the stator (12).

According to this configuration, since the magnetic flux generated in the exciting coil (14) can be further increased, the attraction force of the mover (13) in contact with the stator (12) can be further increased.

REFERENCE SIGNS LIST 1 contact device 4 housing 6 first yoke 7 second yoke 8 movable contact 10 electromagnet device 11 yoke 12 stator 13 movable 14 excitation coil 21, 21 a, 22, 22 a bus bar 31, 32 fixed terminal 81, 82 movable Contact 85 end (upper end)
86 end (lower end)
Reference Signs List 100 electromagnetic relay 111 yoke upper plate 141 part of circumferential direction 224, 224a
225 Electric circuit piece (connection electric circuit piece)
226, 217a Circuit piece (forward direction circuit piece)
241, 242, 251, 252 Ends 311, 321 Fixed contact D1 Tangential direction I1 Current (first current)
I2 current (second current)

Claims (13)

1. A fixed terminal having a fixed contact,
   A movable contact having a movable contact, wherein the movable contact moves between a closed position where the movable contact contacts the fixed contact and an open position where the movable contact separates from the fixed contact;
   At least one comprises a reverse path piece and a forward path piece electrically connected to the fixed terminal,
   A current flows in a first direction from one end of the movable contact to the other end,
   The reverse direction electric path piece and the forward direction electric path piece are arranged on the same side with respect to the movable contact when viewed from the moving direction of the movable contact,
   The reverse-direction electric path piece extends along the first direction, and is orthogonal to both the moving direction of the movable contact and the first direction when the position of the movable contact is the closed position. When viewed from the second direction, at least a portion is disposed so as to be located on the opposite side to the fixed contact with respect to the movable contact,
   In the reverse direction circuit piece, the current flows in a third direction from the other end of the movable contact toward the one end,
   The forward-direction electric path piece extends along the first direction, and when the position of the movable contact is the closed position, at least a part of the forward-direction path contact with respect to the movable contact when viewed from the second direction. It is arranged to be located on the same side as the fixed contact,
   The current flows in the first direction in the forward-direction path piece,
   One of the reverse path piece and the forward direction path piece, when the position of the movable contact is the closed position, overlaps with the movable contact when viewed from the second direction,
   When the reverse electric path piece overlaps the movable contact as viewed from the second direction, the reverse electric path piece is at least from the fixed contact among the both ends in the moving direction of the movable contact. Overlaps with the far end,
   When the forward electric path piece overlaps with the movable contact as viewed from the second direction, the forward electric path piece is provided on at least the fixed contact among the both ends in the moving direction of the movable contact. A contact device characterized by overlapping with a near end.
2. 2. The contact device according to claim 1, further comprising a connection circuit piece that connects the reverse direction circuit piece and the forward direction circuit piece. 3.
3. The connection circuit piece is disposed on the same side as the reverse circuit piece and the forward circuit piece with respect to the movable contact when viewed from the moving direction of the movable contact. 3. The contact device according to 2.
4. In the moving direction of the movable contact, a first yoke located on the same side as the side where the fixed contact exists with respect to the movable contact,
   A second yoke positioned on a side opposite to a side where the fixed contact is present with respect to the movable contact in the moving direction of the movable contact, further comprising: a reverse path piece and a forward path piece; The magnetic flux generated by the passing current passes through the second yoke in the same direction as the direction of the magnetic flux generated in the second yoke by the current passing through the movable contact. 3. The contact device according to item 1.
5. A housing housing the fixed contact and the movable contact, further comprising:
   The contact device according to any one of claims 1 to 4, wherein the reverse direction electric path piece and the forward direction electric path piece are arranged outside the housing.
6. A bus bar including the reverse circuit piece and the forward circuit piece,
   The contact device according to any one of claims 1 to 5, wherein the bus bar is mechanically connected to the fixed terminal.
7. When the position of the movable contact is the closed position, when viewed from the second direction, an end of the opposite end of the reverse path in the moving direction of the movable contact that is closer to the forward path. Overlaps the movable contactor, or
   When the position of the movable contact is the closed position, as viewed from the second direction, an end of the forward contact in the moving direction of the movable contact that is closer to the reverse contact. The contact device according to any one of claims 1 to 6, wherein the contact member overlaps the movable contact.
8. A contact device according to any one of claims 1 to 7,
   An electromagnet device for moving the movable contact,
   The electromagnet device,
   An exciting coil,
   And a yoke forming a part of a path of a magnetic flux generated in the exciting coil.
9. The electromagnet device is disposed on a side opposite to the fixed contact with respect to the movable contact,
   Part of the yoke is present between the excitation coil and the movable contact,
   At least a part of the reverse-direction electric path piece overlaps with the part of the yoke as viewed from the second direction, or is located on the exciting coil side with respect to the yoke. Item 9. An electromagnetic relay according to item 8.
10. The reverse direction electric path piece extends along a tangential direction of a part of a circumferential direction of the excitation coil when viewed from an axial direction of the excitation coil,
    The direction of the first current as the current flowing through the reverse direction path piece and the direction of the second current flowing through the part of the exciting coil in the circumferential direction when the exciting coil is energized are the same. The electromagnetic relay according to claim 8 or 9, wherein:
11. The electromagnet device is disposed on the same side as the fixed contact with respect to the movable contact,
    A part of the yoke exists between the excitation coil and the fixed contact,
    At least a part of the forward-direction path piece overlaps with the part of the yoke viewed from the second direction, or is located on the exciting coil side with respect to the part of the yoke. The electromagnetic relay according to claim 8.
12. The forward direction electric path piece extends along a tangential direction of a part of a circumferential direction of the excitation coil when viewed from an axial direction of the excitation coil,
    The direction of the current flowing through the forward-direction path piece and the direction of the current flowing through the part of the exciting coil in the circumferential direction when the exciting coil is energized are the same. 12. The electromagnetic relay according to 11.
13. The electromagnet device,
    A stator,
    A movable element that moves between an excitation position in contact with the stator and a non-excitation position away from the stator, in accordance with energization and non-energization of current to the excitation coil,
    The stator and the mover are arranged inside an opening of the excitation coil,
    One of the forward-direction path piece and the reverse-direction path piece is arranged such that an attraction force in which the movable element is attracted to the stator by a current flowing through the electric path piece increases.
    The electromagnetic relay according to any one of claims 9 to 12, wherein:

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