JP2021057319A - Contact mechanism and electromagnetic contactor using the same - Google Patents

Abstract

To provide a contact mechanism which can be miniaturized while improving arc extinguishing performance.SOLUTION: A pair of fixed contacts 13, 14 include first conductive plate portions 13b, 14b provided with fixed contacts 13a, 14a, second conductive plate portions 13c, 14c extending orthogonally from end portions of the first conductive plate portions, and third conductive plate portions 13d, 14d extending in parallel to the first conductive plate portions from the end portions of the second conductive plate portions, and have C-shapes when viewed from side surfaces thereof. The pair of fixed contacts are arranged at both ends in a longitudinal direction of an insulating holder 18, and the first conductive plate portion and the third conductive plate portion thereof extend inward in the longitudinal direction of the insulating holder. Further, a pair of permanent magnets 40 and 41 for arc extinguishing are arranged so as to face each other in a lateral direction of the insulating holder. Magnetizing surfaces of the pair of arc-extinguishing permanent magnets which face each other are magnetized to magnetic poles corresponding to a direction in which arc is extended inward in the longitudinal direction of the insulating holder.SELECTED DRAWING: Figure 5

Description

The present invention relates to a contact mechanism for opening and closing an electric current path and an electromagnetic contactor using the contact mechanism.

As a contact mechanism applied to an electromagnetic contactor in which an arc is generated when a current is cut off, for example, the one described in Patent Document 1 is known.
The contact mechanism of Patent Document 1 includes a pair of fixed contacts having fixed contacts, and movable contacts provided with a pair of movable contacts that can be contacted and separated from the fixed contacts of the pair of fixed contacts on both ends in the longitudinal direction. An insulating case formed of the pair of fixed contacts and an insulating material accommodating the movable contacts, a permanent magnet for arc extinguishing that extends an arc generated between the pair of fixed contacts and the pair of movable contacts, and a permanent magnet for arc extinguishing. It has.

The movable contact is a conductive plate extending in the longitudinal direction at the center position in the lateral direction of the rectangular parallelepiped insulating case, and a pair of movable contacts are arranged on both ends of the movable contact in the longitudinal direction. Is provided.
The pair of fixed contacts are the first and second conductive plate portions facing the front and back sides of both ends in the longitudinal direction of the movable contacts, and the front and back directions of the movable contacts from the ends of the first and second conductive plate portions. It is a C-shaped conductive plate when viewed from the side surface provided with a third conductive plate portion extending to the surface.

The arc extinguishing permanent magnets are a pair of permanent magnets that are arranged facing each other on the outside in the longitudinal direction of the insulating case and magnetized so that their magnetic pole surfaces are S poles, and on the outside in the lateral direction of the insulating case. A pair of permanent magnets are arranged so as to face each other and magnetized so that their magnetic pole surfaces are N poles.
According to this contact mechanism, when the movable contacts are in contact with each other between the pair of fixed contacts, when an arc is generated between the pair of fixed contacts and the movable contacts when the state is changed from the closed state to the released state, insulation is performed. The magnetic flux generated by the two pairs of arc extinguishing permanent magnets arranged in the longitudinal direction and the lateral direction of the case makes movable contact with the position where the arc is generated between the pair of fixed contacts and the movable contacts. It crosses in the longitudinal direction of the child, and a Lorentz force acts on the arc in a direction orthogonal to the longitudinal direction of the movable contactor. As a result, the generated arc is stretched toward the arc extinguishing space provided in the lateral direction of the insulating case to extinguish the arc.

Japanese Unexamined Patent Publication No. 2016-24864

However, the contact mechanism of Patent Document 1 has a problem in terms of arc extinguishing performance because the arc extinguishing space provided in the lateral direction of the insulating case is a small space and the generated arc cannot be sufficiently extended. There is.
Further, the contact mechanism of Patent Document 1 is a device corresponding to non-polarity without limiting the current flow direction, and two pairs of permanent arc extinguishing magnets are arranged in the longitudinal direction and the lateral direction of the insulating case. Therefore, when the current flow direction is positive, the arc is stretched toward the arc extinguishing space provided in one of the short sides of the insulating case, and when the current flow direction is opposite. , The arc is extended toward the arc extinguishing space provided in the other lateral direction of the insulating case. As described above, since it is necessary to provide an arc extinguishing space corresponding to the current flow in both the forward and reverse directions in the lateral direction inside the insulating case, the insulating case becomes large. Therefore, there is a problem that the demand for miniaturization cannot be met.
Therefore, the present invention has been made by paying attention to the problems of the conventional example described in Patent Document 1, and uses a contact mechanism capable of reducing the size while improving the arc extinguishing performance. It is intended to provide a patented magnetic contactor.

In order to achieve the above object, the contact mechanism according to one aspect of the present invention is movable having a pair of fixed contacts having fixed contacts and a pair of movable contacts that can be attached to and detached from the fixed contacts of the pair of fixed contacts. A contact storage case that houses a contact, a pair of fixed contacts and a movable contact and has an insulating holder, and a pair of movable fixed contacts and a movable contact of a pair of fixed contacts that are arranged outside the contact storage case. It is a contact mechanism including a pair of permanent magnets for arc extinguishing that extend the arc generated between the contacts. The pair of fixed contacts extends from the end of the first conductive plate portion provided with the fixed contact, the second conductive plate portion extending from the end portion of the first conductive plate portion, and the end portion of the second conductive plate portion. It has a C-shape when viewed from the side surface provided with the existing third conductive plate portion. A pair of fixed contacts are arranged at both ends of the insulating holder in the longitudinal direction. The pair of arc-extinguishing permanent magnets are arranged so as to face each other in the lateral direction of the insulating holder, and the magnetized surfaces of the pair of arc-extinguishing permanent magnets facing each other have an arc in the longitudinal direction of the insulating holder. It is magnetized on a magnetic pole that is stretched inward.
Further, the electromagnetic contactor according to one aspect of the present invention includes the above-mentioned contact mechanism and an electromagnet unit that brings a pair of movable contacts of the movable contacts of the contact mechanism into contact with and detached from the fixed contacts of the pair of fixed contacts. ing.

According to the contact mechanism of the present invention and the magnetic contactor using the contact mechanism, it is possible to reduce the size while improving the arc extinguishing performance.

It is a perspective view which shows the electromagnetic contactor which concerns on this invention. It is a top view which shows the electromagnetic contactor which concerns on this invention. FIG. 2 is a view taken along the line AA of FIG. It is a perspective view which shows the structure of the pair of fixed contactors and movable contactors which constitute the contact mechanism of 1st Embodiment. It is a schematic diagram which shows the operation of the contact mechanism of 1st Embodiment. It is a figure which shows the Lorentz force of the self-magnetic field generated by the current energization of a fixed contact and a movable contact in 1st Embodiment. It is a perspective view which shows the structure of the pair of fixed contactors and movable contactors which constitute the contact mechanism of 2nd Embodiment. It is a perspective view which shows the fixed contact element which comprises the contact mechanism of 2nd Embodiment. It is a schematic diagram which shows the operation of the contact mechanism of 2nd Embodiment. It is a schematic diagram which shows the operation of the contact mechanism of 3rd Embodiment.

Next, the first to third embodiments of the present invention will be described with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the plane dimension, the ratio of the thickness of each layer, etc. are different from the actual ones. Therefore, the specific thickness and dimensions should be determined in consideration of the following explanation. In addition, it goes without saying that the drawings include parts having different dimensional relationships and ratios from each other.

Further, the first to third embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is based on the material of the component parts. The shape, structure, arrangement, etc. are not specified as follows. The technical idea of the present invention may be modified in various ways within the technical scope specified by the claims stated in the claims.
In addition, the terms indicating the directions such as "top", "bottom", "bottom", "front", "rear", "long direction", "short direction", etc. described in the following explanation are attached drawings. It is used with reference to the direction of.

The magnetic contactors of the first to third embodiments shown below are polar magnetic contactors in which the current flow direction is limited.
[About the electromagnetic contactor of the first embodiment]
As shown in FIGS. 1 and 2, the magnetic contactor 1 according to the first embodiment of the present invention includes a contact mechanism 2, an electromagnet unit 20 for driving the contact mechanism 2, and a first contact mechanism 2 arranged around the contact mechanism 2. , The permanent magnets 40 and 41 for extinguishing the second arc are provided.
As shown in FIG. 3, the electromagnet unit 20 has a magnetic yoke 28 having a substantially U shape when viewed from the side surface, and a fixed plunger 29 is arranged at the center of the bottom plate portion of the magnetic yoke 28, and the fixed plunger 29 is arranged. The spool 30 is arranged on the outside of the. An exciting coil 34 is wound around the spool 30.

The upper magnetic yoke 21 fixed to the upper end of the magnetic yoke 28 is formed with a through hole 21a facing the central cylindrical portion 31 of the spool 30 in the central portion. The upper portion of the fixed plunger 29 inserted into the central cylindrical portion 31 of the spool 30 is covered with a cap (not shown) formed in a bottomed tubular shape, and extends outward in the radial direction to the open end of the cap. The formed flange portion (not shown) is hermetically joined to the lower surface of the upper magnetic yoke 21. As a result, a sealing space is formed in which the cap is communicated through the through hole 21a of the upper magnetic yoke 21. Further, a movable plunger (not shown) is slidably inserted inside the cap so as to be slidable up and down, and a circumference protruding outward in the radial direction to the upper end portion protruding upward from the upper magnetic yoke 21 of the movable plunger. The flange portion 22 is formed.

An annularly formed permanent magnet for driving 37 is fixed to the upper surface of the upper magnetic yoke 21 so as to surround the peripheral flange portion 22 of the movable plunger. The driving permanent magnet 37 is magnetized in the vertical direction, that is, in the thickness direction so that, for example, the upper end side has an N pole and the lower end side has an S pole. An auxiliary yoke 39 is fixed to the upper end surface of the driving permanent magnet 37, and the peripheral flange portion 22 of the movable plunger is in contact with the lower surface of the auxiliary yoke 39.
As shown in FIG. 3, the contact mechanism 2 is housed in the case 4. The case 4 includes a metal square cylinder 5 and an insulating substrate 6 formed of an insulating material such as ceramic or synthetic resin that seals the upper end of the square cylinder 5. The sealed case 4 is filled with arc extinguishing gas.

In the square cylinder 5, the flange portion 7 formed at the lower portion is sealed and fixed to the upper magnetic yoke 21 of the electromagnet unit 20. Through holes 9 and 10 are formed in the insulating substrate 6 at predetermined intervals.
The contact mechanism 2 includes a pair of fixed contacts 13 and 14 (hereinafter, referred to as a first fixed contact 13 and a second fixed contact 14) fixed to the insulating substrate 6 via conductor portions 11 and 12. A movable contact 15 arranged so as to be detachable from the first and second fixed contacts 13 and 14 is provided.

As shown in FIG. 4, the movable contact 15 is a linearly long conductive plate made of a conductive material, and has a through hole 23 formed in the central portion in the longitudinal direction, and both ends in the longitudinal direction. A first movable contact 15a and a second movable contact 15b are formed on the lower surface of the side.
As shown in FIG. 3, a connecting shaft 24 fixed to the movable plunger of the electromagnet unit 20 is inserted through the through hole 23 of the movable contact 15. A C ring 27 is fixed to the upper end of the connecting shaft 24, and a contact spring 26 is arranged on the outer circumference of the connecting shaft 24 between the C ring 27 and the upper center of the movable contact 15 to the movable contact 15. On the other hand, a predetermined urging force is given. Further, a return spring 36 is also arranged on the outer circumference of the connecting shaft 24 between the auxiliary yoke 39 and the lower portion around the through hole 23 of the movable contact 15 to apply a predetermined urging force to the movable contact 15. ing.

As shown in FIG. 4, the first fixed contact 13 is bent upward from the end portion of the first conductive plate portion 13b provided with the first fixed contact 13a on the upper surface and the first conductive plate portion 13b. The shape of the second conductive plate portion 13c is the same as that of the first conductive plate portion 13b that is bent from the upper end of the second conductive plate portion 13c and extends parallel to the first conductive plate portion 13b. It is a C-shaped member when viewed from the side surface provided with the third conductive plate portion 13d.
As shown in FIG. 4, the second fixed contact 14 is also formed from the first conductive plate portion 14b having the second fixed contact 14a on the upper surface and the end portion of the first conductive plate portion 14b away from the movable contact 15. A second conductive plate portion 14c that is bent and extends upward, and a first conductive plate that is bent from the upper end of the second conductive plate portion 14c and extends parallel to the first conductive plate portion 14b. It is a C-shaped member when viewed from the side surface provided with the third conductive plate portion 14d having the same plate shape as the portion 14b.

As shown in FIG. 3, an insulating holder 18 formed in a bottomed rectangular tubular shape is arranged on the inner peripheral surface of the square tubular body 5 of the case 4. The insulating holder 18 is formed by molding an insulating, for example, synthetic resin, and has an insulating function of blocking the influence of an arc on the metal square cylinder 5.
Here, as shown in FIG. 5, the first and second fixed contacts 13 and 14 are arranged apart from each other in the longitudinal direction of the insulating holder 18. The first fixed contact 13 is arranged so that the first conductive plate portion 13b extends inward in the longitudinal direction toward one side of the insulating holder 18 in the lateral direction. Further, the second fixed contact 14 is arranged so that the first conductive plate portion 14b extends inward in the longitudinal direction toward the other side of the insulating holder 18 in the lateral direction. Then, the first movable contact 15a faces the first fixed contact 13a of the first fixed contact 13, and the second movable contact 15b faces the second fixed contact 14a of the second fixed contact 14. The movable contact 15 is arranged diagonally across the longitudinal direction of the insulating holder 18. The insulating holder 18 is formed with plate-shaped arc barriers 19a and 19b that rise from the bottom surface and extend along both side surfaces of the movable contact 15 in the lateral direction.

As shown in FIG. 5, a metal magnet support 42 is arranged on the outside of the square cylinder 5 of the case 4 so as to cover the outer circumference, and the magnet support 42 is provided on the electromagnetic contactor 1. It is supported by a holding member (not shown).
The permanent magnet 40 for extinguishing the first arc is a magnet so as to face one of the first movable contacts 15a and the first fixed contact 13 in the longitudinal direction of the movable contact 15 via the square cylinder 5 and the insulating holder 18. It is fixed to one side of the support 42 in the lateral direction. The first arc extinguishing permanent magnet 40 is magnetized so that the magnetic pole surface facing the square cylinder 5 is the north pole.

The second arc extinguishing permanent magnet 41 is a magnet support so as to face the other movable contact 15b and the second fixed contact 14 in the longitudinal direction of the movable contact 15 via the square cylinder 5 and the insulating holder 18. It is fixed to the other side in the longitudinal direction of 42. The second arc extinguishing permanent magnet 41 is magnetized so that the magnetic pole surface facing the square cylinder 5 is the S pole.
As a result, as shown in FIG. 5, the magnetic flux Φ1 that emerges from the north pole of the first arc extinguishing permanent magnet 40 and flows to the south pole of the second arc extinguishing permanent magnet 41 is transferred to the first fixed contactor 13. It crosses the first fixed contact 13a and the second fixed contact 14a of the second fixed contact 14.

Next, the operation of the magnetic contactor 1 of the first embodiment will be described.
First, a load is connected to the conductor portion 12 of the contact mechanism 2 of the magnetic contactor 1, and a power supply source for supplying an electric current is connected to the conductor portion 11.
It is assumed that the exciting coil 34 of the electromagnet unit 20 is in a non-energized state and is in a released state in which the electromagnet unit 20 does not generate an exciting force for lowering the movable plunger 22.
In this released state, the movable plunger is urged upward by the return spring 36 away from the upper magnetic yoke 21. At the same time, the attractive force due to the magnetic force of the driving permanent magnet 37 acts on the auxiliary yoke 39, and the peripheral flange portion 22 of the movable plunger is attracted. Therefore, the upper surface of the peripheral flange portion 22 of the movable plunger is in contact with the lower surface of the auxiliary yoke 39.

At this time, the first movable contact 15a and the second movable contact 15b of the movable contact 15 of the contact mechanism 2 connected to the movable plunger via the connecting shaft 24 are the first fixed contact 13a of the first fixed contact 13. , The second fixed contact 14 is separated from the second fixed contact 14a upward by a predetermined distance. As a result, the current path between the first fixed contact 13 and the second fixed contact 14 is in a cutoff state, and the contact mechanism 2 is in an open state.
When the exciting coil 34 of the electromagnet unit 20 is energized from this released state, an exciting magnetic force is generated by the electromagnet unit 20, and the movable plunger is moved downward against the urging force of the return spring 36 and the attractive force of the driving permanent magnet 37. Push down to. The lowering of the movable plunger is stopped when the lower surface of the peripheral flange portion 22 hits the upper surface of the upper magnetic yoke 21.

As the movable plunger is lowered in this way, the movable contact 15 connected to the movable plunger via the connecting shaft 24 is also lowered, and the first movable contact 15a and the second movable contact 15b of the movable contact 15 are lowered. Each contacts the first fixed contact 13a of the first fixed contact 13 and the second fixed contact 14a of the second fixed contact 14 with the contact pressure of the contact spring 26.
Therefore, as shown in FIG. 4, a large current of the power supply source is supplied from the third conductive plate portion 13d of the first fixed contactor 13 of the electromagnetic contactor 1 to the first conductive plate portion 13b, and the movable contactor. It flows to the first conductive plate portion 14b of the second fixed contactor 14 through 15, is supplied to the load through the third conductive plate portion 1 of the second fixed contactor 14, and the contact mechanism 2 is closed.

Next, when the current supply to the load is cut off from the closed pole state of the contact mechanism 2, the energization of the electromagnet unit 20 to the exciting coil 34 is stopped.
When the energization of the exciting coil 34 is stopped, the electromagnet unit 20 eliminates the exciting force that moves the movable plunger downward, so that the movable plunger rises due to the urging force of the return spring 36, and the peripheral flange portion 22 becomes the auxiliary yoke 39. The attractive force of the driving permanent magnet 37 increases as it approaches.

As the movable plunger rises, the movable contact 15 connected via the connecting shaft 24 rises. When the contact pressure is applied by the contact spring 26 in response to this, the first movable contact 15a and the second movable contact 15b of the movable contact 15 are respectively the first fixed contact 13a and the first fixed contact 13a of the first fixed contact 13. It is in contact with each of the second fixed contacts 14a of the second fixed contact 14a. After that, when the contact pressure of the contact spring 26 disappears, the movable contact 15 is in an open state in which the movable contact 15 is separated upward from the first fixed contact 13 and the second fixed contact 14.
In such an open state, the first movable contact 15a and the second movable contact 15b of the movable contact 15 and the first fixed contact 13a of the first fixed contact 13 and the second fixed contact 14 of the second fixed contact 14 are fixed. An arc is generated between the contact and the contact 14a, and the current is continuously energized by the arc.

As shown in FIG. 5, the arc A1 generated between the first movable contact 15a of the movable contact 15 and the first fixed contact 13a of the first fixed contact 13 has an arc current flow direction and a first arc. Due to the relationship with the magnetic flux Φ1 that emerges from the north pole of the arc-extinguishing permanent magnet 40 and flows to the south pole of the second arc-extinguishing permanent magnet 41, the Lorentz force generated by Fleming's left-hand rule causes the magnet to flow inward in the longitudinal direction. Is stretched. Here, since the movable contact 15 is arranged diagonally across the longitudinal direction of the insulating holder 18, a large arc is extended in the center of the insulating holder 18 in the longitudinal direction by the Lorentz force due to the arc current and the magnetic flux φ1. An arc extinguishing space S1 is provided.

Further, as shown in FIG. 6, the current flow direction of the second conductive plate portion 13c of the first fixed contact 13 and the arc current flow direction between the first fixed contact 13a and the first movable contact 15a are opposite to each other. Lorentz force is generated by the self-magnetic field in the direction. Here, since Lorentz force is applied in the direction in which the arc current between the second conductive plate portion 13c and the first fixed contact 13a and the first movable contact 15a repels, the direction is inclined by about 45 ° from the magnetic flux φ1. Lorentz force will work. Then, by combining this Lorentz force with the Lorentz force generated by the arc current and the magnetic flux φ1, as shown in FIG. 5, the Lorentz force is inclined inward in the longitudinal direction and outward on one side in the lateral direction. The arc A1 in the direction of the arrow is generated. Therefore, the arc A1 generated between the first fixed contact 13a and the first movable contact 15a of the first fixed contact 13 is sufficiently extended toward the large arc extinguishing space S1 and extinguished. To go.

Further, as shown in FIG. 5, the arc A2 generated between the second movable contact 15b of the movable contact 15 and the second fixed contact 14a of the second fixed contact 14 is the arc current flow direction and the second fixed contact. It is stretched inward in the longitudinal direction by the Lorentz force generated by the magnetic flux Φ1 generated between the permanent magnet 40 for arc extinguishing 1 arc and the permanent magnet 41 for arc extinguishing 2nd arc. A large arc extinguishing space S2 is also provided at the center of the insulating holder 18 in which the arc current arc A2 is extended in the longitudinal direction. Then, the current flow direction of the second conductive plate portion 14c of the second fixed contact 14 and the arc current flow direction between the second fixed contact 14a and the second movable contact 15b become opposite directions due to the self-magnetic field. Lorentz force is generated. Here, since Lorentz force is applied in the direction in which the arc current between the second conductive plate portion 14c and the second fixed contact 14a and the second movable contact 15b repels, the direction is inclined by about 45 ° from the magnetic flux φ1. Lorentz force will work. Then, by combining this Lorentz force with the Lorentz force generated by the arc current and the magnetic flux φ1, as shown in FIG. 5, the Lorentz force is inclined inward in the longitudinal direction and outward on the other side in the lateral direction. The arc A2 in the direction of the arrow is generated. Therefore, the arc A2 generated between the second fixed contact 14a and the second movable contact 15b of the second fixed contact 14 is sufficiently extended toward the large arc extinguishing space S2 and extinguished. To go.

[About the effect of the first embodiment]
Therefore, according to the electromagnetic contactor 1 of the first embodiment, the first and second fixed contacts 13 and 14 are arranged apart from each other in the longitudinal direction of the insulating holder 18, and the first fixed contact 13 is The first conductive plate portion 13b is arranged so as to extend inward in the longitudinal direction toward one side of the insulating holder 18 in the lateral direction, and the second fixed contact 14 is arranged in the lateral direction of the insulating holder 18. The first conductive plate portion 14b is arranged so as to extend inward in the longitudinal direction toward the other side. Then, the first movable contact 15a faces the first fixed contact 13a of the first fixed contact 13, and the second movable contact 15b faces the second fixed contact 14a of the second fixed contact 14. Since the movable contact 15 is arranged diagonally across the longitudinal direction of the insulating holder 18, large arc extinguishing spaces S1 and S2 are provided at the center of the insulating holder 18 in the longitudinal direction.

Then, Lorentz force is applied in the direction in which the second conductive plate portion 13c of the first fixed contact 13 and the arc current generated between the first fixed contact 13a and the first movable contact 15a repel each other, so that the magnetic flux φ1 A Lorentz force acts in a direction tilted by about 45 ° from, and by combining this Lorentz force with the Lorentz force generated by the arc current and magnetic flux φ1, it goes inward in the longitudinal direction and one in the lateral direction. An arc A1 in the direction of the arrow inclined to the outside of is generated. As a result, the arc A1 generated between the first fixed contact 13a and the first movable contact 15a of the first fixed contact 13 is sufficiently extended toward the large arc extinguishing space S1.

Further, since Lorentz force is applied in the direction in which the second conductive plate portion 14c of the second fixed contact 14 and the arc current between the second fixed contact 14a and the second movable contact 15b repel each other, the Lorentz force is approximately from the magnetic flux φ1. Lorentz force acts in the direction tilted by 45 °, and by combining this Lorentz force with the Lorentz force generated by the arc current and magnetic flux φ1, it goes inward in the longitudinal direction and outside the other in the lateral direction. An arc A2 in the direction of the arrow inclined to is generated. As a result, the arc A2 generated between the second fixed contact 14a and the second movable contact 15b of the second fixed contact 14 is sufficiently stretched toward the large arc extinguishing space S2 and extinguished. To go.

Therefore, the arc extinguishing performance of the arcs A1 and A2 can be sufficiently improved.
Further, the Lorentz force generated in the self-magnetic field of the current flowing through the first movable contact 15a of the first fixed contact 13 and the movable contact 15 and the second movable contact 15b of the second fixed contact 14 and the movable contact 15 Since the Lorentz force generated in the self-magnetic field of the flowing current increases as the current value increases, the arc extinguishing performance when a large current flows can be improved.
Further, since the generated arc is cooled by the arc extinguishing gas sealed in the sealed case 4, the arc extinguishing performance can be further improved.

Further, the insulating holder 18 is formed with plate-shaped arc barriers 19a and 19b extending along both side surfaces of the movable contact 15 in the lateral direction, and these arc barriers 19a and 19b are first fixed. Insulation that prevents the arc A1 generated between the contact 13a and the first movable contact 15a and the arc A2 generated between the second fixed contact 14a and the second movable contact 15b from extending in a direction close to each other. Since it becomes a wall, it is possible to prevent a short circuit between phases.
Further, in the electromagnetic contactor 1 of the first embodiment, the first and second arc extinguishing permanent magnets 40 and 41 are arranged in the lateral direction of the insulating holder 18, and the first fixed contact 13a and the first movable contact 15a are arranged. Since the structure is such that the arc A1 generated between the arcs A1 and the arcs A2 generated between the second fixed contact 14a and the second movable contact 15b are extended inward in the longitudinal direction of the insulating holder 18, the insulating holder It is possible to suppress the increase in size in the lateral direction and reduce the size of the device.

[About the electromagnetic contactor of the second embodiment]
Next, FIGS. 7 to 9 show the configuration of the contact mechanism 2 of the second embodiment that constitutes the electromagnetic contactor according to the present invention. The same components as those shown in FIGS. 1 to 6 are designated by the same reference numerals, and the description thereof will be omitted.
As shown in FIG. 7, the contact mechanism 2 of the second embodiment is arranged so as to be detachable from the first fixed contact 50 and the second fixed contact 51 and the first and second fixed contacts 50 and 51. The movable contactor 15 and the like are provided.

As shown in FIG. 8, the first fixed contact 50 is bent upward from the ends of the first conductive plate portion 50b provided with the first fixed contact 50a on the upper surface and the first conductive plate portion 50b. A second conductive plate portion 50c existing and a third conductive plate portion 50d bent from the upper end of the second conductive plate portion 50c and extending parallel to the first conductive plate portion 50b are provided. It is a C-shaped member when viewed from the side surface. Here, the first conductive plate portion 50b of the first fixed contact 50 is not the same plate shape as the third conductive plate portion 50d, but is extended outward from one side portion of the first conductive plate portion 50b. An extension portion 50b1 is formed, and a first fixed contact 50a is formed in the extension portion 50b1.

Further, the second fixed contact 51 is also bent upward from the end portion of the first conductive plate portion 51b having the first fixed contact 51a on the upper surface and the first conductive plate portion 51b. C when viewed from the side surface including the conductive plate portion 51c and the third conductive plate portion 51d which is bent from the upper end of the second conductive plate portion 51c and extends parallel to the first conductive plate portion 51b. The first conductive plate portion 51b is a character-shaped member, and an extension portion 51b1 extending outward from one side portion of the first conductive plate portion 51b is formed, and the first fixed contact 51a is formed on the extension portion 51b1. Is formed.

As shown in FIG. 9, the first and second fixed contacts 50 and 51 are arranged apart from each other in the longitudinal direction of the insulating holder 18. The first fixed contact 50 is arranged so that the first conductive plate portion 50b extends inward in the longitudinal direction of the insulating holder 18, and the extension portion 50b1 extends in the lateral direction of the insulating holder 18. It is arranged so as to approach. Further, the second fixed contact 51 is arranged so that the first conductive plate portion 51b extends inward in the longitudinal direction of the insulating holder 18, and the extension portion 51b1 is the other side of the insulating holder 18 in the lateral direction. It is arranged so as to approach.

Then, the first movable contact 15a faces the first fixed contact 50a of the first fixed contact 50, and the second movable contact 15b faces the second fixed contact 51a of the second fixed contact 51. The movable contact 15 is arranged diagonally across the longitudinal direction of the insulating holder 18.
Further, the insulating holder 18 is formed with plate-shaped arc barriers 52a and 52b that rise from the bottom surface and extend along both side surfaces of the movable contact 15 in the lateral direction.
When the magnetic contactor 1 of the second embodiment is in the open pole state, the first movable contact 15a and the second movable contact 15b of the movable contactor 15 and the first fixed contact 50a and the second fixed contact 50a of the first fixed contactor 50 are fixed. An arc is generated between the contactor 51 and the second fixed contact 51a, and the current energization state is continued by the arc.

As shown in FIG. 9, the arc A3 generated between the first movable contact 15a of the movable contact 15 and the first fixed contact 50a of the first fixed contact 50 has an arc current flow direction and a first arc. Due to the relationship between the arc-extinguishing permanent magnet 40 and the second arc-extinguishing permanent magnet 41 and the magnetic flux Φ1, the Lorentz force generated by Fleming's left-hand rule causes the magnet to be stretched inward in the longitudinal direction. Here, since the movable contact 15 is arranged diagonally across the longitudinal direction of the insulating holder 18, a large arc is extended in the center of the insulating holder 18 in the longitudinal direction by the Lorentz force due to the arc current and the magnetic flux φ1. An arc extinguishing space S3 is provided.

Further, the current flow direction of the second conductive plate portion 50c of the first fixed contact 50 and the arc current flow direction between the first fixed contact 50a and the first movable contact 15a become opposite directions due to the self-magnetic field. Lorentz force is generated. Since the Lorentz force is applied in the direction in which the arc current between the second conductive plate portion 50c and the first fixed contact 50a and the first movable contact 15a repels, the Lorentz force is applied in the direction inclined by about 45 ° from the magnetic flux φ1. Will work. Then, by combining this Lorentz force with the Lorentz force generated by the arc current and the magnetic flux φ1, the arc A3 in the arrow direction that is directed inward in the longitudinal direction and inclined outward on one side in the lateral direction is generated. appear. Therefore, the arc A3 generated between the first fixed contact 50a and the first movable contact 15a of the first fixed contact 50 is sufficiently extended toward the large arc extinguishing space S3 and extinguished. To go.

Further, as shown in FIG. 9, the arc A4 generated between the second movable contact 15b of the movable contact 15 and the first fixed contact 51a of the second fixed contact 51 has the arc current flow direction and the first It is stretched inward in the longitudinal direction by the Lorentz force generated by the magnetic flux Φ1 generated between the permanent magnet 40 for arc extinguishing 1 arc and the permanent magnet 41 for arc extinguishing 2nd arc. A large arc extinguishing space S4 is also provided at the center of the insulating holder 18 in which the arc current arc A4 is extended in the longitudinal direction.

Then, the current flow direction of the second conductive plate portion 51c of the second fixed contact 51 and the arc current flow direction between the second fixed contact 51a and the second movable contact 15b become opposite directions due to the self-magnetic field. Lorentz force is generated. Then, Lorentz force is applied in the direction in which the second conductive plate portion 51c of the second fixed contact 51 and the arc current between the second fixed contact 14a and the second movable contact 15b repel each other, so that the Lorentz force is approximately from the magnetic flux φ1. Lorentz force acts in the direction tilted by 45 °, and by combining this Lorentz force with the Lorentz force generated by the arc current and magnetic flux φ1, it goes inward in the longitudinal direction and outside the other in the lateral direction. An arc A4 in the direction of the arrow inclined to is generated. As a result, the arc A4 generated between the second fixed contact 51a and the second movable contact 15b of the second fixed contact 51 is sufficiently stretched toward the large arc extinguishing space S4 and extinguished. To go.

[About the effect of the second embodiment]
Therefore, according to the electromagnetic contactor 1 of the second embodiment, the first and second fixed contacts 50 and 51 are arranged apart from each other in the longitudinal direction of the insulating holder 18, and the first fixed contactor 50 is The extension portion 50b1 is arranged so as to extend inward in the longitudinal direction toward one side of the insulating holder 18 in the lateral direction, and the extension portion 51b1 of the second fixed contactor 51 extends in the lateral direction of the insulating holder 18. It is arranged so as to extend inward in the longitudinal direction toward the other side of the. Then, the first movable contact 15a faces the first fixed contact 50a of the first fixed contact 50, and the second movable contact 15b faces the second fixed contact 51a of the second fixed contact 51. Since the movable contact 15 is arranged diagonally across the longitudinal direction of the insulating holder 18, large arc extinguishing spaces S3 and S4 are provided at the center of the insulating holder 18 in the longitudinal direction.

Then, Lorentz force is applied in the direction in which the second conductive plate portion 50c of the first fixed contact 50 and the arc current generated between the first fixed contact 13a and the first movable contact 15a repel each other, so that the magnetic flux φ1 A Lorentz force acts in a direction tilted by about 45 ° from, and by combining this Lorentz force with the Lorentz force generated by the arc current and magnetic flux φ1, it goes inward in the longitudinal direction and one in the lateral direction. An arc A3 in the direction of the arrow inclined to the outside of is generated. As a result, the arc A3 generated between the first fixed contact 50a and the first movable contact 15a of the first fixed contact 50 is sufficiently extended toward the large arc extinguishing space S3.

Further, since Lorentz force is applied in the direction in which the second conductive plate portion 51c of the second fixed contact 51 and the arc current between the second fixed contact 51a and the second movable contact 15b repel each other, the Lorentz force is approximately from the magnetic flux φ1. Lorentz force acts in the direction tilted by 45 °, and by combining this Lorentz force with the Lorentz force generated by the arc current and magnetic flux φ1, it goes inward in the longitudinal direction and outside the other in the lateral direction. An arc A4 in the direction of the arrow inclined to is generated. As a result, the arc A4 generated between the second fixed contact 51a and the second movable contact 15b of the second fixed contact 51 is sufficiently stretched toward the large arc extinguishing space S4 and extinguished. To go.

Therefore, the arc extinguishing performance of the arcs A1 and A2 can be sufficiently improved.
Further, the Lorentz force generated in the self-magnetic field of the current flowing through the first movable contact 15a of the first fixed contact 50 and the movable contact 15 and the second movable contact 15b of the second fixed contact 51 and the movable contact 15 Since the Lorentz force generated in the self-magnetic field of the flowing current increases as the current value increases, the arc extinguishing performance when a large current flows can be improved.
Further, the insulating holder 18 is formed with plate-shaped arc barriers 52a and 52b extending along both side surfaces of the movable contact 15 in the lateral direction, and these arc barriers 52a and 52b are first fixed. Insulation that prevents the arc A3 generated between the contact 50a and the first movable contact 15a and the arc A4 generated between the second fixed contact 51a and the second movable contact 15b from extending in a direction close to each other. Since it becomes a wall, it is possible to prevent a short circuit between phases.

Further, in the electromagnetic contactor 1 of the second embodiment, the first and second arc extinguishing permanent magnets 40 and 41 are arranged in the lateral direction of the insulating holder 18, and the first fixed contact 50a and the first movable contact 15a are arranged. Since the structure is such that the arc A3 generated between the arcs A3 and the arcs A4 generated between the second fixed contact 51a and the second movable contact 15b are extended inward in the longitudinal direction of the insulating holder 18, the insulating holder It is possible to suppress the increase in dimensions in the lateral direction and reduce the size of the device.

[About the magnetic contactor of the third embodiment]
Next, FIG. 10 shows the configuration of the contact mechanism 2 of the third embodiment that constitutes the electromagnetic contactor according to the present invention. The same components as those of the second embodiment shown in FIGS. 7 to 9 are designated by the same reference numerals, and the description thereof will be omitted.
The contact mechanism 2 of the third embodiment includes a first fixed contact 50 and a second fixed contact 51, and a movable contact 60 arranged so as to be detachable from the first and second fixed contacts 50 and 51. It has.
The movable contact 60 is a long conductive member, and a movable intermediate portion 61 extending at an inclination with respect to the longitudinal direction of the insulating holder 18 is provided at the central portion in the longitudinal direction, and the movable intermediate portion 61 of the movable intermediate portion 61. On one end side in the longitudinal direction, a first movable end portion 62 extending toward one side in the lateral direction of the insulating holder 18 and extending outward in the longitudinal direction is provided, and the other end in the longitudinal direction of the movable intermediate portion 61 is provided. On the side, a second movable end 63 extending outward in the longitudinal direction toward the other side of the insulating holder 18 in the lateral direction is provided.

Then, the first movable contact 62a provided on the first movable end 62 of the movable contact 60 faces the first fixed contact 50a of the first fixed contact 50, and the second movable contact 62a provided on the second movable end 63 faces the first fixed contact 50a. The contact 63a faces the first fixed contact 51a of the second fixed contact 51.
The arc barriers 52a and 52b rising from the bottom surface of the insulating holder 18 extend along both side surfaces of the movable intermediate portion 61 in the lateral direction.
When the magnetic contactor 1 of the third embodiment is in the open pole state, the first movable contact 62a and the second movable contact 63a of the movable contactor 60, and the first fixed contact 50a and the second fixed contact 50a of the first fixed contactor 50 are fixed. An arc is generated between the contactor 51 and the second fixed contact 51a, and the current energization state is continued by the arc.

As shown in FIG. 10, the arc A5 generated between the first movable contact 62a of the movable contact 60 and the first fixed contact 50a of the first fixed contact 50 has the arc current flow direction and the first arc. Due to the relationship between the arc-extinguishing permanent magnet 40 and the second arc-extinguishing permanent magnet 41 and the magnetic flux Φ1, the Lorentz force generated by Fleming's left-hand rule causes the magnet to be stretched inward in the longitudinal direction. Here, since the movable contact 60 is provided with the first movable end portion 62 extending in the longitudinal direction toward one side of the insulating holder 18 in the lateral direction, the Lorentz force due to the arc current and the magnetic flux φ1 is used. The arc A5 is stretched along the first movable end 62 and moves toward the large arc extinguishing space S5 in front of the arc A5.

Further, the current flow direction of the second conductive plate portion 50c of the first fixed contact 50 and the flow direction of the arc current between the first fixed contact 50a and the first movable contact 62a become opposite directions due to the self-magnetic field. Lorentz force is generated, and this Lorentz force is also in the same direction as the Lorentz force generated in the arc current and the magnetic flux φ1. Therefore, the arc A5 generated between the first fixed contact 50a of the first fixed contact 50 is the Lorentz force of the self-magnetic field of the first fixed contact 50 and the movable contact 60, and the Lorentz force of the arc current and the magnetic flux φ1. Due to the force, the arc is sufficiently extended and extinguished toward the large arc extinguishing space S5.

Further, the arc A6 generated between the second movable contact 63a of the movable contact 60 and the first fixed contact 51a of the second fixed contact 51 has the arc current flow direction and the permanent magnet for extinguishing the first arc. It is stretched inward in the longitudinal direction by the Lorentz force generated by the magnetic flux Φ1 generated between the 40 and the permanent magnet 41 for extinguishing the second arc. Here, since the movable contact 60 is provided with the second movable end portion 63 extending in the longitudinal direction toward the other side of the insulating holder 18 in the lateral direction, the Lorentz force due to the arc current and the magnetic flux φ1 is used. The arc A6 is extended along the second movable end 63 and moves toward the large arc extinguishing space S6 in front of the arc A6.

Then, the current flow direction of the second conductive plate portion 51c of the second fixed contact 51 and the current flow direction of the arc current between the second fixed contact 51a and the second movable contact 63a become opposite directions due to the self-magnetic field. Since the Lorentz force is generated, this Lorentz force is also in the same direction as the Lorentz force generated in the arc current and the magnetic flux φ1. Therefore, the arc A6 generated between the second fixed contact 51a of the second fixed contact 51 also has the Lorentz force of the self-magnetic field of the second fixed contact 51 and the movable contact 60, and the Lorentz force of the arc current and the magnetic flux φ1. Due to the force, the arc is sufficiently extended and extinguished toward the large arc extinguishing space S6.

[About the effect of the third embodiment]
Therefore, according to the electromagnetic contactor 1 of the third embodiment, the movable contactor 60 is provided with a first movable end portion 62 extending in the longitudinal direction toward one side of the insulating holder 18 in the lateral direction. Therefore, the Lorentz force due to the arc current and the magnetic flux φ1 and the Lorentz force generated in the self-magnetic field of the current flowing through the first movable contact 62a of the first fixed contactor 50 and the movable contactor 60 cause the arc A5 to be the first movable end. It is stretched along the portion 62 and moves toward the large arc extinguishing space S5 in front of the portion 62. Further, since the movable contact 60 is provided with the second movable end portion 63 extending in the longitudinal direction toward the other side of the insulating holder 18 in the lateral direction, the Lorentz force due to the arc current and the magnetic flux φ1 and the Lorentz force are obtained. 2 The arc A6 is stretched along the second movable end 63 by the Lorentz force generated in the self-magnetic field of the current flowing through the second movable contact 63a of the fixed contact 51 and the movable contact 60. It moves toward the large arc extinguishing space S5 in front. Therefore, the third embodiment can also improve the arc extinguishing performance.

Further, the insulating holder 18 is formed with arc barriers 52a and 52b extending along both side surfaces of the movable intermediate portion 61 in the lateral direction, and these arc barriers 52a and 52b are the first fixed contacts. An insulating wall that prevents the arc A5 generated between the 50a and the first movable contact 62a and the arc A6 generated between the second fixed contact 51a and the second movable contact 63a from extending in a direction close to each other. Therefore, it is possible to prevent a short circuit between the phases.

1 Electromagnetic contactor 2 Contact mechanism 4 Case 5 Square cylinder 6 Insulated substrate 7 Flange part 9, 10 Through hole 11, 12 Conductor part 13 First fixed contact 13a First fixed contact 13b First conductive plate part 13c Second conductive Plate 13d 3rd Conductive Plate 14 2nd Fixed Contact 14a 2nd Fixed Contact 14b 1st Conductive Plate 14c 2nd Conductive Plate 14d 3rd Conductive Plate 15 Movable Contact 15a, 15b Movable Contact 18 Insulation Holder 19a , 19b Arc barrier 20 Electromagnetic unit 21 Upper magnetic yoke 21a Through hole 22 Circumferential flange 23 Through hole 24 Connecting shaft 26 Contact spring 27 C ring 28 Magnetic yoke 29 Fixed plunger 30 Spool 31 Central cylindrical part 34 Exciting coil 36 Return spring 37 Drive Permanent magnet 39 Auxiliary yoke 40, 41 Permanent magnet for extinguishing the first and second arcs 42 Magnet support 50 First fixed contact 51 Second fixed contact 50a First fixed contact 50b First conductive plate 50c Second Conductive plate part 50d 3rd conductive plate part 50b1 Extension part 51a 1st fixed contact 51b 1st conductive plate part 51c 2nd conductive plate part 51d 3rd conductive plate part 51b1 Extension part 52a, 52b Arc barrier 60 Movable contactor 61 Movable intermediate Part 62 First movable end 63 Second movable end 62a First movable contact 63a Second movable contact A1, A2 Arc S1, S2 Arc extinguishing space

Claims (8)

A pair of fixed contacts having fixed contacts, a movable contact having a pair of movable contacts that can be attached to and detached from the fixed contacts of the pair of fixed contacts, the pair of fixed contacts, and the movable contacts are housed. A pair of contact storage cases having an insulating holder and a pair of arcs arranged outside the contact storage case and extending an arc generated between the fixed contacts of the pair of fixed contacts and the pair of movable contacts of the movable contacts. In a contact mechanism equipped with a permanent magnet for arc extinguishing
The pair of fixed contacts include a first conductive plate portion provided with the fixed contact, a second conductive plate portion extending from the end portion of the first conductive plate portion, and an end portion of the second conductive plate portion. It has a C-shape when viewed from the side surface with a third conductive plate portion extending from.
The pair of fixed contacts are arranged at both ends of the insulating holder in the longitudinal direction.
The pair of arc-extinguishing permanent magnets are arranged so as to face each other in the lateral direction of the insulating holder, and the magnetizing surfaces of the pair of arc-extinguishing permanent magnets facing each other have the arc of the insulating holder. A contact mechanism characterized in that it is magnetized on a magnetic pole that extends inward in the longitudinal direction. One of the pair of fixed contacts is arranged closer to one of the insulating holders in the lateral direction.
The contact mechanism according to claim 1, wherein the other of the pair of fixed contacts is arranged closer to the other of the insulating holder in the lateral direction. The first conductive plate portion of the pair of fixed contacts has a shape in which an extension portion protruding from the side portion is provided with respect to the third conductive plate portion, and the fixed contact is formed in the extension portion.
The extension portion of one of the pair of fixed contacts is arranged closer to one side of the insulating holder in the lateral direction.
The contact mechanism according to claim 1, wherein the extension portion of the other of the pair of fixed contacts is arranged closer to the other in the lateral direction of the insulating holder. The movable contact is a linear conductive plate in which the pair of movable contacts are provided on both ends in the longitudinal direction and extends obliquely with respect to the longitudinal direction of the insulating holder. The contact mechanism according to any one of 3. The movable contact is formed at one end of a movable intermediate portion extending diagonally with respect to the longitudinal direction of the insulating holder and one end of the movable intermediate portion in the longitudinal direction, and is arranged on one side of the insulating holder in the lateral direction. The conductive member is provided with a first movable end having the movable contact and a second movable end having the movable contact arranged on the other side of the insulating holder in the lateral direction. The contact mechanism according to any one of claims 1 to 3. The insulating holder is provided with an arc barrier that prevents arcs generated between the fixed contact of the pair of fixed contacts and the pair of movable contacts of the movable contact from approaching each other. The contact mechanism according to any one of claims 1 to 5. The contact mechanism according to any one of claims 1 to 6, wherein an arc extinguishing gas is sealed in the contact storage case. The contact mechanism according to any one of claims 1 to 7.
An electromagnetic contactor comprising: an electromagnet unit for bringing the pair of movable contacts of the movable contactor of the contact mechanism into contact with the fixed contact of the pair of fixed contacts.

Images