JP7077890B2 - Contact mechanism and electromagnetic contactor using this - Google Patents

Description

The present invention relates to a contact mechanism for opening and closing a 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 a movable contact 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 is equipped with.

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 on both ends in the longitudinal direction of the movable contact, and the front and back directions of the movable contact 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. These pair of fixed contacts are arranged so as to sandwich both ends of the movable contact in the longitudinal direction so as to give Lorentz force to the movable contact against the electromagnetic repulsive force at the time of energization, and overcurrent withstand performance. We are trying to improve.

Further, the permanent magnets for arc extinguishing are a pair of permanent magnets arranged opposite to each other on the outer side in the longitudinal direction of the insulating case and magnetized so that the magnetic pole surfaces of each magnet are S poles, and the permanent magnets in the lateral direction of the insulating case. A pair of permanent magnets are arranged so as to face each other on the outside 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 and the state of being released is changed to the released state, when an arc is generated between the pair of fixed contacts and the movable contacts, each other The magnetic fluxes from the north pole to the south pole of the arc-extinguishing permanent magnets arranged facing each other are in the longitudinal direction of the movable contact with respect to the position where the arc is generated between the pair of fixed contacts and the movable contact. It crosses, and Lorentz force acts on the arc in the 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, in the contact mechanism of Patent Document 1, 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, which is a problem in terms of arc extinguishing performance. 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 in the positive direction, the arc is extended toward the arc extinguishing space provided in one of the short sides of the insulating case, and when the current flow direction is in the opposite direction. , 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 the contact point can be miniaturized while improving the overcurrent withstand performance and the arc extinguishing performance. It is an object of the present invention to provide a mechanism and an electromagnetic contactor using the mechanism.

In order to achieve the above object, the contact mechanism according to one aspect of the present invention is a pair of fixed contacts having fixed contacts and a pair of fixed contacts that can be connected to and separated from each other in the contact storage case. The arc generated between the movable contacts provided on both ends in the longitudinal direction and the fixed contacts of the pair of fixed contacts and the pair of movable contacts of the movable contacts arranged on the outside of the contact storage case. In a contact mechanism comprising a pair of extending arc-extinguishing permanent magnets, the pair of fixed contacts are placed on both ends of the movable contact in the longitudinal direction facing one of the front and back surfaces and are movable contacts. A first conductive plate portion having a fixed contact that is in contact with and separated from the magnet, a second conductive plate portion that extends from the end portion of the first conductive plate portion in the front and back directions of the movable contactor, and a first conductive plate portion from the second conductive plate portion. It has a C-shape when viewed from the side surface provided with a third conductive plate portion that extends parallel to the plate portion and is arranged so as to face the other surface of the front and back surfaces of the movable contactor. .. Then, if the line connecting the centers of the pair of arc extinguishing permanent magnets is the permanent magnet center line and the line connecting the pair of movable contacts of the movable contact is the movable contact center line, the movable contact is a movable contact. The center line is arranged so as to intersect the center line of the permanent magnet, a pair of fixed contacts are arranged along the center line of the movable contactor, and a pair of permanent magnets for arc extinguishing are attached to each other so as to face each other. The magnetic surface is magnetized on a magnetic pole in which the arc is extended beyond the center line of the permanent magnet , and the first movable contact is provided with a pair of movable contacts at both ends in the longitudinal direction of the movable contact. A first conductive plate portion and a first conductive plate portion in which a portion and a second movable contact portion are formed, and the extending directions of the first movable contact portion and the second movable contact portion are arranged in parallel with each other of a pair of fixed contacts. 2 It coincides with the extending direction of the conductive plate portion.

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 overcurrent withstand performance and the arc extinguishing performance.

It is an exploded perspective view which shows the electromagnetic contactor which concerns on 1st Embodiment which concerns on this invention. It is a vertical sectional view of the electromagnetic contactor of 1st Embodiment. It is a perspective view which showed the structure of the contact mechanism in the state which removed the contact storage case of 1st Embodiment. It is a plan sectional view of the contact mechanism of 1st Embodiment. It is a schematic diagram which shows the generation state of the magnetic field by the 1st and 2nd main terminal boards. It is a perspective view which showed the structure of the contact mechanism in the state which removed the contact storage case of 2nd Embodiment which concerns on this invention. It is a plan sectional view of the contact mechanism of 2nd Embodiment. It is a perspective view which showed the structure of the contact mechanism in the state which removed the contact storage case of the 3rd Embodiment which concerns on this invention. It is a plan sectional view of the contact mechanism of 3rd Embodiment. It is a perspective view which showed the structure of the contact mechanism in the state which removed the contact storage case of 4th Embodiment which concerns on this invention. It is a plan sectional view of the contact mechanism of 4th Embodiment. It is a perspective view which showed the structure of the contact mechanism in the state which removed the contact storage case of 5th Embodiment which concerns on this invention. It is a perspective view which showed the structure of the contact mechanism in the state which removed the contact storage case of 6th Embodiment which concerns on this invention.

Next, the first to sixth 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 dimensions, 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 parts having different dimensional relationships and ratios are included between the drawings.

Further, the first to sixth embodiments shown below exemplify the apparatus and method for embodying the technical idea of the present invention, and the technical idea of the present invention is based on the material of the constituent 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 described 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 sixth embodiments shown below are polar electromagnetic contactors in which the current flow direction is limited.

(First Embodiment)
As shown in FIG. 1, the magnetic contactor 1 of the first embodiment according to the present invention includes a contact mechanism 2, an electromagnet unit 20 for driving the contact mechanism 2, and first and first first contact mechanisms arranged around the contact mechanism 2. It includes two arc-extinguishing permanent magnets 40 and 41, and a first main terminal plate 43A and a second main terminal plate 43B fixed to the contact mechanism 2.
As shown in FIG. 2, the electromagnet unit 20 has a U-shaped magnetic yoke 28 that is flat 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 29. The excitation 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 part of the fixed plunger 29 inserted into the central cylindrical portion 31 of the spool 30 is covered with a cap 35 formed in a bottomed tubular shape, and is formed by extending outward in the radial direction to the open end of the cap 35. The flange portion 35a is hermetically joined to the lower surface of the upper magnetic yoke 21. This forms a sealed container in which the cap 35 communicates through the through hole 21a of the upper magnetic yoke 21. A movable plunger 22 is slidably inserted into the inside of the cap 35. The movable plunger 22 is formed with a peripheral flange portion 22a protruding outward in the radial direction at an upper end portion protruding upward from the upper magnetic yoke 21.

A driving permanent magnet 37 formed in an annular shape is fixed to the upper surface of the upper magnetic yoke 21 so as to surround the peripheral flange portion 22a of the movable plunger 22. The driving permanent magnet 37 is magnetized so that, for example, the upper end side is the N pole and the lower end side is the S pole in the vertical direction, that is, the thickness direction. An auxiliary yoke 39 is fixed to the upper end surface of the driving permanent magnet 37, and the peripheral flange portion 22a of the movable plunger 22 is in contact with the lower surface of the auxiliary yoke 39.
As shown in FIG. 2, 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 a ceramic or a synthetic resin material that closes the upper end of the square cylinder 5.

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 FIGS. 3 and 4, the movable contact 15 is a linearly long conductive plate made of a conductive material, and a through hole 23 is formed in the central portion in the longitudinal direction. A first movable contact 15a and a second movable contact 15b are formed on the lower surfaces on both ends in the direction.
As shown in FIG. 2, a connecting shaft 24 fixed to the movable plunger 22 of the electromagnet unit 20 is inserted through the through hole 23 of the movable contact 15. A flange portion 25 projecting outward is formed in the central portion of the connecting shaft 24 in the longitudinal direction, and the flange portion 25 is in contact with the lower center of the movable contactor 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 periphery of the connecting shaft 24 between the C ring and the upper center of the movable contact 15 to the movable contact 15. It gives a predetermined urging force. Further, a return spring 36 is also arranged on the outer periphery of the connecting shaft 24 between the auxiliary yoke 39 and the lower portion of the flange portion 25 to apply a predetermined urging force to the movable contactor 15.
An insulating cylinder portion 18 formed in a bottomed square cylinder shape is disposed on the inner peripheral surface of the square cylinder 5 of the case 4. The insulating cylinder portion 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.

As shown in FIG. 3, the first fixed contact 13 is arranged on the first movable contact 15a side of the movable contact 15, faces the first movable contact 15a of the movable contact 15 from below, and has a second position. 1 The second conductive plate portion 13c that is bent upward from the end portion of the first conductive plate portion 13b provided with the fixed contact 13a on the upper surface and the first conductive plate portion 13b away from the movable contact 15 A third conductive plate portion 13d that is bent from the upper end of the second conductive plate portion 13c and extends above the movable contact 15; and a C-shaped member as viewed from the side surface.
As shown in FIG. 3, the second fixed contact 14 is arranged on the second movable contact 15b side of the movable contact 15, faces the second movable contact 15b of the movable contact 15 from below, and has a second position. 2 The second conductive plate portion 14c that is bent upward from the end portion of the first conductive plate portion 14b provided with the fixed contact 14a on the upper surface and the first conductive plate portion 14b separated from the movable contact 15 A third conductive plate portion 14d that is bent from the upper end of the second conductive plate portion 14c and extends above the movable contact 15; and a C-shaped member as viewed from the side surface.

The movable contacts 15 are in a released state, and the movable contacts 15a and 15b located on both ends in the longitudinal direction and the fixed contacts 13a and 14a of the fixed contacts 13 and 14 are separated from each other with a predetermined interval.
When the movable contact 15 is turned on, the movable contacts 15a and 15b are set to contact the fixed contacts 13a and 14a of the fixed contacts 13 and 14 with a predetermined contact pressure by the contact spring 26.
The sealed case 4 is filled with arc extinguishing gas.

Further, as shown in FIGS. 2 and 4, a metal rectangular magnet support 42 is arranged on the outside of the square cylinder 5 of the case 4 so as to cover the entire outer periphery, and the magnet support 42 is arranged. 42 is supported by a holding member (not shown) provided on the electromagnetic contactor 1.
The permanent magnet 40 for extinguishing the first arc is magnet-supported so as to face one movable contact 15a in the longitudinal direction of the movable contact 15 and the first fixed contact 13 via a square cylinder 5 and an insulating cylinder 18. It is fixed to one side of the body 42 in the longitudinal direction. The first arc extinguishing permanent magnet 40 is magnetized so that the magnetic pole surface facing the square cylinder 5 is the N pole.
The second arc extinguishing permanent magnet 41 is magnet-supported 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 cylinder portion 18. It is fixed to the other side of the body 42 in the longitudinal direction. The second arc extinguishing side 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. 4, the magnetic flux Φ1 that emerges from the N pole of the first arc extinguishing permanent magnet 40 and flows to the S pole of the second arc extinguishing permanent magnet 41 is generated by the first fixed contact. It crosses the first fixed contact 13a and the second fixed contact 14a of the second fixed contact 14.
Here, as shown in FIG. 4, the center of the first arc extinguishing permanent magnet 40 and the second arc extinguishing permanent magnet 41 arranged outside the insulating cylinder portion 18 and fixed to the magnet support 42. If the straight line connecting the positions is the permanent magnet center line ML and the straight line connecting the first movable contact 15a and the second movable contact 15b of the movable contact 15 is the movable contact center line KL1, the movable contact center line KL1 is a permanent magnet. Movable contacts 15 are arranged so as to intersect the center line ML. That is, the movable contact 15 is arranged so as to extend in the diagonal direction of the rectangular insulating cylinder portion 18 in a plan view.

As shown in FIG. 4, the first fixed contact 13 is located on the left side of the permanent magnet center line ML, and the first conductive plate portion 13b and the third conductive plate portion 13d are located on the permanent magnet center line ML. The second conductive plate portion 13c extends along the line and is arranged so as to face the first arc extinguishing permanent magnet 40. In the second fixed contactor 14, the first conductive plate portion 14b and the third conductive plate portion 14d extend along the permanent magnet center line ML at a position closer to the right side with respect to the permanent magnet center line ML. The two conductive plate portions 14c are arranged so as to face the second arc extinguishing permanent magnet 41.
Further, as shown in FIG. 1, the first main terminal plate 43A and the second main terminal plate 43B are fixed to the conductor portions 11 and 12 protruding from the insulating substrate 6 of the contact mechanism 2 by fixing bolts 44A and 44B. ..

The first main terminal plate 43A includes an intermediate plate portion 43Aa, a mounting plate portion 43Ab extending forward from the left end of the intermediate plate portion 43Aa, and an external connection plate extending forward from the right end of the intermediate plate portion 43Aa. It is composed of a part 43Ac and. Then, the first main terminal plate 43A is fixed to the conductor portion 11 by screwing the screw portion of the fixing bolt 44A inserted into the insertion hole 43Ab 1 formed in the mounting plate portion 43Ab into the screw hole formed in the conductor portion 11. There is.
The second main terminal plate 43B includes an intermediate plate portion 43Ba, a mounting plate portion 43Bb extending rearward from the right end of the intermediate plate portion 43Ba, and an external connection plate extending rearward from the left end of the intermediate plate portion 43Ba. It is composed of a part 43Bc and a part 43Bc. Then, the second main terminal plate 43B is fixed to the conductor portion 12 by screwing the screw portion of the fixing bolt 44B inserted into the insertion hole 43Bb1 formed in the mounting plate portion 43Bb into the screw hole formed in the conductor portion 12. There is.

Next, the operation of the electromagnetic contactor 1 of the first embodiment will be described.
First, a load is connected to the external connection plate portion 43Ac of the first main terminal plate 43A, and a power supply source for supplying a large current is connected to the external connection plate portion 43Bc of the second main terminal plate 43B.
At this time, 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 22 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 22a of the movable plunger 22 is attracted. Therefore, the upper surface of the peripheral flange portion 22a of the movable plunger 22 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 22 via the connecting shaft 24 are the first fixed contact of the first fixed contact 13. 13a, the second fixed contact 14a is separated upward by a predetermined distance from the second fixed contact 14a. As a result, the current path between the first fixed contact 13 and the second fixed contact 14 is in the cutoff state, and the contact mechanism 2 is in the open pole 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 22 resists the urging force of the return spring 36 and the attractive force of the driving permanent magnet 37. Push down. The descent of the movable plunger 22 is stopped when the lower surface of the peripheral flange portion 22a hits the upper surface of the upper magnetic yoke 21.

As described above, when the movable plunger 22 is lowered, the movable contact 15 connected to the movable plunger 22 via the connecting shaft 24 is also lowered, and the first movable contact 15a and the second movable contact 15 of the movable contact 15 are also lowered. Each of the 15b comes into contact with each of the first fixed contact 13a of the first fixed contact 13 and the second fixed contact 14a of the second fixed contact 14 by the contact pressure of the contact spring 26.
Therefore, a large current of the power supply source is supplied to the load through the second main terminal board 43B, the second fixed contact 14, the movable contact 15, the first fixed contact 13, and the first main terminal board 43A, and the contacts are contacted. The mechanism 2 is in a closed pole state.

In this closed pole state, the first fixed contact 13a and the second fixed contact 14 of the first fixed contact 13 are caused by the current flowing through the first fixed contact 13 and the second fixed contact 14 and the movable contact 15. An electromagnetic repulsive force that moves the movable contact 15 in the opening direction is generated between the second fixed contact 14a and the movable contact 15.
However, the direction of the current flowing on the first movable contact 15a side of the movable contact 15 and the direction of the current flowing through the third conductive plate portion 13d of the C-shaped first fixed contact 13 when viewed from the side surface are opposite directions. Therefore, the direction of the current flowing on the second movable contact 15b side of the movable contact 15 and the direction of the current flowing through the third conductive plate portion 14d of the C-shaped second fixed contact 14 when viewed from the side surface are opposite directions. It becomes. Due to this action, a Lorentz force that opposes the electromagnetic repulsive force is generated in the movable contactor 15.

Moreover, as shown in FIG. 5, the direction between the input side current flowing through the intermediate plate portion 43Ba of the second main terminal plate 43B and the output side current flowing through the intermediate plate portion 43Aa of the first main terminal plate 43A facing the input side current. Are in the same direction. The direction of the current flowing through the intermediate plate portions 43Ba and 43Aa also coincides with the direction of the current flowing through the third conductive plate portion 13d of the first fixed contact 13 and the third conductive plate portion 14d of the second fixed contact 14.
Therefore, between the intermediate plate portions 43Ba and 43Aa, the inner magnetic field due to the current flowing in both is canceled, but the outer magnetic fields are coupled to each other and counterclockwise surrounding the intermediate plate portions 43Aa and 43Ba as shown in FIG. A common external magnetic field MF around is generated.

The external magnetic field MF has a direction orthogonal to the current flowing through the movable contact 15 and is parallel to the plate surface of the movable contact 15.
Therefore, according to Fleming's left-hand rule, it is possible to generate a Lorentz force that presses the movable contact 15 against the first fixed contact 13a of the first fixed contact 13 and the second fixed contact 14a of the second fixed contact 14.
As a result, in addition to the Lorentz force that opposes the electromagnetic repulsive force of the first fixed contact 13 and the second fixed contact 14, the movable contact 15 is provided with the first main terminal plate 43A and the second main terminal plate 43B. Since the Lorentz force that opposes the electromagnetic repulsive force acts, the overcurrent withstand performance can be further improved.

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 exciting coil 34 of the electromagnet unit 20 is stopped.
When the energization of the exciting coil 34 is stopped, the exciting force that moves the movable plunger 22 downward by the electromagnet unit 20 disappears, so that the movable plunger 22 rises due to the urging force of the return spring 36, and the peripheral flange portion 22a becomes the auxiliary yoke. The attractive force of the driving permanent magnet 37 increases as it approaches 39.
As the movable plunger 22 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. 4, the arc generated between the first movable contact 15a of the movable contact 15 and the first fixed contact 13a of the first fixed contact 13 is the current flow direction of the arc and the first arc. It is stretched by the Lorentz force F1 generated by Fleming's left-hand rule due to the relationship with the magnetic flux Φ1 that emerges from the N pole of the arc-extinguishing permanent magnet 40 and flows to the S-pole of the second arc-extinguishing permanent magnet 41.

Since the first movable contact 15a and the first fixed contact 13 of the movable contact 15 are arranged at positions closer to the left side with respect to the permanent magnet center line ML, the arc is extended by the Lorentz force F1. Is provided with a large arc extinguishing space S1. As a result, the arc is sufficiently extended and extinguished toward the large arc extinguishing space S1.
Further, the arc generated between the second movable contact 15b of the movable contact 15 and the first fixed contact 14a of the second fixed contact 14 has the arc current flow direction and the first and second arc extinguishing arcs. Due to the relationship with the magnetic flux Φ1 generated by the permanent magnets 40 and 41, it is stretched by the Lorentz force F2 generated by Fleming's left-hand rule. Since the second movable contact 15b and the second fixed contact 14 are arranged at positions closer to the right side with respect to the permanent magnet center line ML, they are large in the direction in which the arc is extended by the Lorentz force F2. The arc extinguishing space S2 is provided, and the arc is sufficiently extended and extinguished toward the large arc extinguishing space S2.

The arc generated as described above is stretched by the Lorentz forces F1 and F2 generated by Fleming's left-hand rule due to the relationship with the magnetic flux Φ1 generated by the permanent magnets 40 and 41 for extinguishing the first and second arcs. The arc is extinguished by being cooled by the arc extinguishing gas enclosed in the contact mechanism 2.
Therefore, according to the electromagnetic contactor 1 of the first embodiment, the movable contactor 15 is first movable with respect to the permanent magnet center line ML connecting the center positions of the first and second arc extinguishing permanent magnets 40 and 41. The movable contactor 15 is arranged so that the movable contactor center line KL1 connecting the contact points 15a and the second movable contactor 15b intersects. Therefore, the arc generated between the first movable contact 15a of the movable contact 15 and the first fixed contact 13a of the first fixed contact 13 exceeds the permanent magnet center line ML and becomes a large arc extinguishing space S1. The arc that is sufficiently stretched and generated between the second movable contact 15b of the movable contact 15 and the first fixed contact 14a of the second fixed contact 14 exceeds the permanent magnet center line ML and extinguishes a large arc. Since it is sufficiently extended to the arc space S2, the arc extinguishing performance can be improved.

Further, since the generated arc is cooled by the arc extinguishing gas enclosed in the sealed case 4, the arc extinguishing performance can be further improved.
Further, in the closed state of the contact mechanism 2, the Lorentz force against the electromagnetic repulsive force in the opening direction due to the energizing current is applied to the movable contact 15 by the first fixed contact 13 having a C shape when viewed from the side surface. And can be generated by the second fixed contact 14 and can also be generated by the first main terminal board 43A and the second main terminal board 43B. Therefore, it is possible to increase the Lorentz force that resists the electromagnetic repulsive force in the opening direction of the movable contact 15 in the closed pole state. Therefore, it is possible to further improve the overcurrent withstand performance of the magnetic contactor 1.
Further, in the first embodiment, a pair of permanent magnets 40 and 41 for extinguishing the arcs of the first and second arcs are arranged around the contact mechanism 2 to form a polar electromagnetic contactor 1, so that the device can be downsized. Can be planned.

(Second Embodiment)
Next, FIGS. 6 and 7 show the inside of the contact mechanism 2 of the second embodiment constituting the electromagnetic contactor according to the present invention. The same components as those shown in FIGS. 1 to 5 are designated by the same reference numerals, and the description thereof will be omitted.
The contact mechanism 2 of the second embodiment includes a first fixed contact 13 and a second fixed contact 14, a movable contact 50 arranged so as to be detachable from the first and second fixed contacts 13, 14 and the like. It is equipped with.
As shown in FIG. 7, the movable contact 50 is a conductive long plate material, and has an intermediate plate portion 50a in which a through hole 23 is formed in a central portion in the longitudinal direction and an intermediate plate portion 50a in the longitudinal direction. The first orthogonal plate portion 50b extending orthogonally from one end to the intermediate plate portion 50a and the other end in the longitudinal direction of the intermediate plate portion 50a in the direction opposite to the first orthogonal plate portion 50b. A second orthogonal plate portion 50c extending orthogonally to the intermediate plate portion 50a is provided.

A first movable contact 51a is formed on the lower surface of the first orthogonal plate portion 50b on the distal end side, and a second movable contact 51b is formed on the lower surface of the second orthogonal plate portion 50c on the distal end side.
As shown in FIG. 7, the first fixed contact 13 refers to the permanent magnet center line ML (a straight line connecting the center positions of the first arc extinguishing permanent magnet 40 and the second arc extinguishing permanent magnet 41). The first conductive plate portion 13b and the third conductive plate portion 13d extend along the permanent magnet center line ML at a position closer to the left side, and the second conductive plate portion 13c faces the first arc extinguishing permanent magnet 40. Arranged to do.

In the second fixed contactor 14, the first conductive plate portion 14b and the third conductive plate portion 14d extend along the permanent magnet center line ML at a position closer to the right side with respect to the permanent magnet center line ML. The two conductive plate portions 14c are arranged so as to face the second arc extinguishing permanent magnet 41.
In the movable contact 50, a connecting shaft 24 fixed to the movable plunger 22 of the electromagnet unit 20 is inserted through a through hole 23 of the intermediate plate portion 50a.
Then, in the movable contact 50, the intermediate plate portion 50a extends in the direction orthogonal to the permanent magnet center line ML, and the first orthogonal plate portion 50b and the second orthogonal plate portion 50c extend in the direction along the permanent magnet center line ML. It is extended and arranged.

As a result, assuming that the straight line connecting the first movable contact 51a and the second movable contact 51b of the movable contact 50 is the movable contact center line KL2, the movable contact center line KL2 intersects the permanent magnet center line ML. A movable contact 50 is arranged in the.
According to the electromagnetic contactor 1 of the second embodiment, when the contact mechanism 2 is in the closed pole state, the first fixed contact is caused by the current flowing between the first fixed contactor 13, the second fixed contactor 14, and the movable contactor 15. An electromagnetic repulsive force that moves the movable contactor 15 in the opening direction is generated between the first fixed contact 13a of the child 13 and the second fixed contact 14a of the second fixed contactor 14 and the movable contactor 50.

Here, in the movable contact 50 of the second embodiment, the first orthogonal plate portion 50b forming the first movable contact 51a and the third conductive plate portion 13d of the first fixed contact 13 are centered on a permanent magnet. The second orthogonal plate portion 50c extending in parallel along the line ML and forming the second movable contact 51b and the third conductive plate portion 14d of the second fixed contact 14 form the permanent magnet center line ML. It extends parallel along. Therefore, the direction of the current flowing through the first orthogonal plate portion 50b extending in parallel with each other and the direction of the current flowing in the third conductive plate portion 13d of the first fixed contact 13 are opposite to each other and extending in parallel with each other. The direction of the current flowing through the second orthogonal plate portion 50c and the third conductive plate portion 14d of the second fixed contact 14 is opposite to each other, and a large Lorentz force is generated against the movable contact 50 against the electromagnetic repulsive force. do.

Therefore, in the electromagnetic contactor 1 of the second embodiment, when the contact mechanism 2 is in the closed pole state, the movable contactor 50 resists the electromagnetic repulsive force of the first fixed contactor 13 and the second fixed contactor 14. Since the large Lorentz force acts, the overcurrent withstand performance can be further improved.
On the other hand, when the contact mechanism 2 is in the open pole state, the first movable contact 51a and the second movable contact 51b of the movable contact 50 and the first fixed contact 13a and the second fixed contact 14 of the first fixed contact 13 An arc is generated between the second fixed contact 14a and the current is energized by the arc.

As shown in FIG. 7, the arc generated between the first movable contact 51a of the movable contact 50 and the first fixed contact 13a of the first fixed contact 13 is the current flow direction of the arc and the first arc. It is stretched by the Lorentz force F1 generated by Fleming's left-hand rule due to the relationship with the magnetic flux Φ1 that emerges from the N pole of the arc-extinguishing permanent magnet 40 and flows to the S-pole of the second arc-extinguishing permanent magnet 41.
Since the first movable contact 51a and the first fixed contact 13 of the movable contact 50 are arranged at positions closer to the left side with respect to the permanent magnet center line ML, the arc is extended by the Lorentz force F1. Is provided with a large arc extinguishing space S1. As a result, the arc is sufficiently extended and extinguished toward the large arc extinguishing space S1.

Further, the arc generated between the second movable contact 51b of the movable contact 50 and the first fixed contact 14a of the second fixed contact 14 has the arc current flow direction and the first and second arc extinguishing arcs. Due to the relationship with the magnetic flux Φ1 generated by the permanent magnets 40 and 41, it is stretched by the Lorentz force F2 generated by Fleming's left-hand rule. Since the second movable contact 51b and the second fixed contact 14 are arranged at positions closer to the right side with respect to the permanent magnet center line ML, they are large in the direction in which the arc is extended by the Lorentz force F2. The arc extinguishing space S2 is provided, and the arc is sufficiently extended and extinguished toward the large arc extinguishing space S2.

Therefore, the arc generated between the first movable contact 51a of the movable contact 50 and the first fixed contact 13a of the first fixed contact 13 exceeds the permanent magnet center line ML and is sufficient for a large arc extinguishing space S1. The arc generated between the second movable contact 51b of the movable contact 50 and the first fixed contact 14a of the second fixed contact 14 is also extended to a large arc extinguishing beyond the permanent magnet center line ML. Since it is sufficiently extended to the space S2, the arc extinguishing performance can be improved.

(Third Embodiment)
Next, FIGS. 8 and 9 show the inside of the contact mechanism 2 of the third embodiment constituting the electromagnetic contactor according to the present invention. The same components as those shown in FIGS. 1 to 5 are designated by the same reference numerals, and the description thereof will be omitted.
Similar to the first embodiment, the contact mechanism 2 of the third embodiment is attached to the first fixed contactor 13 arranged at a position closer to the left side with respect to the permanent magnet center line ML and the permanent magnet center line ML. A second fixed contact 14 arranged at a position closer to the right side and a movable contact 15 arranged so as to be detachable from the first and second fixed contacts 13 and 14 are provided.

Then, as in the first embodiment, the movable contact 15 has a straight line connecting the first movable contact 15a and the second movable contact 15b of the movable contact 15 with respect to the permanent magnet center line ML1. They are arranged so as to intersect.
Here, as shown in FIG. 9, the first fixed contactor 13 of the third embodiment is above 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 parallel third conductive plate portion 13d extends in a direction orthogonal to the permanent magnet center line ML, and the opening between the first conductive plate portion 13b and the third conductive plate portion 13d faces to the right. It is arranged so as to have a C-shape when viewed from the direction along the permanent magnet center line ML.

Further, the second fixed contact 14 of the third embodiment also has a third conductive plate portion 14b having a first movable contact 14a on the upper surface and a third conductive plate portion 14b extending in parallel above the first conductive plate portion 14b. The plate portion 14d extends in a direction orthogonal to the permanent magnet center line ML, and the opening between the first conductive plate portion 14b and the third conductive plate portion 14d is arranged so as to face the left side and is permanently arranged. It is arranged so as to have a C-shape when viewed from the direction along the magnet center line ML.
According to the electromagnetic contactor 1 of the third embodiment, when the contact mechanism 2 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 contactor 13 are fixed. An arc is generated between the contact 13a and the second fixed contact 14a of the second fixed contactor 14, and the current energization state is continued by the arc.

The arc generated between the first movable contact 15a of the movable contact 15 and the first fixed contact 13a of the first fixed contact 13 is the flow direction of the arc current and the permanent magnet 40 for extinguishing the first arc. It is stretched by the Lorentz force F1 generated by Fleming's left-hand rule due to the relationship with the magnetic flux Φ1 that comes out of the N pole and flows to the S pole of the second arc extinguishing permanent magnet 41.
At this time, as shown in FIG. 9, the first fixed contact 13 is arranged so as to have a C-shape when viewed from the direction along the permanent magnet center line ML, and the second fixed contact 13 is the second. The conductive plate portion 13c is not arranged at a position that blocks the first arc extinguishing permanent magnet 40. Therefore, the arc generated between the first movable contact 15a and the first fixed contact 13a can be brought close to the first arc extinguishing permanent magnet 40, and a large Lorentz force F1 can be applied to the arc.

Further, the arc generated between the second movable contact 15b of the movable contact 15 and the first fixed contact 14a of the second fixed contact 14 has the arc current flow direction and the first and second arc extinguishing arcs. Due to the relationship with the magnetic flux Φ1 generated by the permanent magnets 40 and 41, it is stretched by the Lorentz force F2 generated by Fleming's left-hand rule.
At this time, the second fixed contact 14 is arranged so as to have a C-shape when viewed from the direction along the permanent magnet center line ML, and the second conductive plate portion 14c of the second fixed contact 14 is the second. 2 It is not arranged at a position that blocks the permanent magnet 41 for arc extinguishing. Therefore, the arc generated between the second movable contact 15b and the second fixed contact 14a can be brought closer to the second arc extinguishing permanent magnet 41, and a large Lorentz force F2 can be applied to the arc.

Therefore, the arc generated between the first movable contact 15a of the movable contact 15 and the first fixed contact 13a of the first fixed contact 13, the second movable contact 15b of the movable contact 15, and the second fixed contact. Since large Lorentz forces F1 and F2 act on the arc generated between the first fixed contacts 14a of 14, they are sufficiently extended to the arc extinguishing spaces S1 and S2 beyond the permanent magnet center line ML. The arc extinguishing performance can be improved.

(Fourth Embodiment)
Next, FIGS. 10 and 11 show the inside of the contact mechanism 2 of the fourth embodiment constituting the electromagnetic contactor according to the present invention. The same components as those shown in FIGS. 1 to 5 are designated by the same reference numerals, and the description thereof will be omitted.
In the contact mechanism 2 of the fourth embodiment, the arrangement of the first fixed contact 13 and the second fixed contact 14 is the same as that of the third embodiment. Further, a movable contact 52 is arranged so as to be connectable and detachable to the first and second fixed contacts 13 and 14.

In the first fixed contact 13 of the third embodiment, the first conductive plate portion 13b provided with the first fixed contact 13a on the upper surface and the third conductive plate portion 13d parallel above the first conductive plate portion 13b are formed. The permanent magnet center line extends in a direction orthogonal to the permanent magnet center line ML, and the opening between the first conductive plate portion 13b and the third conductive plate portion 13d is arranged so as to face the right side of FIG. It is arranged so as to have a C-shape when viewed from the direction along the line ML.
Further, the second fixed contact 14 has a first conductive plate portion 14b having a first movable contact 14a on the upper surface thereof and a third conductive plate portion 14d extending in parallel above the first conductive plate portion 14b. The permanent magnet center line extends in a direction orthogonal to the permanent magnet center line ML, and the opening between the first conductive plate portion 14b and the third conductive plate portion 14d is arranged so as to face the left side of FIG. They are arranged so as to have a C-shape when viewed from the direction along the line ML.

As shown in FIG. 11, the movable contact 52 of the fourth embodiment is a conductive long plate material, and has an intermediate plate portion 52a having a through hole 23 formed in a central portion in the longitudinal direction and an intermediate plate portion. The first orthogonal plate portion 52b extending orthogonally to the intermediate plate portion 52a from one end in the longitudinal direction of 52a, and the first orthogonal plate portion 52b from the other end in the longitudinal direction of the intermediate plate portion 52a. A second orthogonal plate portion 52c extending orthogonally to the intermediate plate portion 52a in the opposite direction is provided.
A first movable contact 53a is formed on the lower surface of the first orthogonal plate portion 52b on the distal end side, and a second movable contact 53b is formed on the lower surface of the second orthogonal plate portion 52c on the distal end side.

In the movable contact 52, a connecting shaft 24 fixed to the movable plunger 22 of the electromagnet unit 20 is inserted through a through hole 23 of the intermediate plate portion 52a.
Then, in the movable contact 52, the intermediate plate portion 52a extends along the permanent magnet center line ML, and the first orthogonal plate portion 52b and the second orthogonal plate portion 52c extend in the direction orthogonal to the permanent magnet center line ML. It is present and arranged.
As a result, assuming that the straight line connecting the first movable contact 53a and the second movable contact 53b of the movable contact 52 is the movable contact center line KL3, the movable contact center line KL3 intersects the permanent magnet center line ML. A movable contact 52 is arranged in the.

According to the electromagnetic contactor 1 of the fourth embodiment, when the contact mechanism 2 is in the closed pole state, the first fixed contact is caused by the current flowing between the first fixed contactor 13, the second fixed contactor 14, and the movable contactor 52. An electromagnetic repulsive force that moves the movable contactor 15 in the opening direction is generated between the first fixed contact 13a of the child 13 and the second fixed contact 14a of the second fixed contactor 14 and the movable contactor 52.
In the movable contact 52 of the fourth embodiment, the first orthogonal plate portion 52b forming the first movable contact 53a and the third conductive plate portion 13d of the first fixed contact 13 are formed on the permanent magnet center line ML. The second orthogonal plate portion 52c extending in parallel in the orthogonal direction and forming the second movable contact 53b and the third conductive plate portion 14d of the second fixed contact 14 are orthogonal to the permanent magnet center line ML. It extends parallel to the direction of magnetism. Therefore, the direction of the current flowing through the first orthogonal plate portion 52b extending in parallel with each other and the direction of the current flowing in the third conductive plate portion 13d of the first fixed contact 13 are opposite to each other and extending in parallel with each other. The direction of the current flowing through the second orthogonal plate portion 52c and the third conductive plate portion 14d of the second fixed contact 14 is opposite to each other, and a large Lorentz force is generated against the movable contact 52 against the electromagnetic repulsive force. do.

Therefore, in the electromagnetic contactor 1 of the fourth embodiment, when the contact mechanism 2 is in the closed pole state, the movable contactor 52 resists the electromagnetic repulsive force of the first fixed contactor 13 and the second fixed contactor 14. Since the large Lorentz force acts, the overcurrent withstand performance can be further improved.
When the contact mechanism 2 is in the open pole state, the first movable contact 53a and the second movable contact 53b of the movable contact 52 and the first fixed contact 13a and the second fixed contact 14 of the first fixed contact 13 An arc is generated between the second fixed contact 14a and the current is energized by the arc.

The arc generated between the first movable contact 15a of the movable contact 15 and the first fixed contact 13a of the first fixed contact 13 is the flow direction of the arc current and the permanent magnet 40 for extinguishing the first arc. It is stretched by the Lorentz force F1 generated by Fleming's left-hand rule due to the relationship with the magnetic flux Φ1 that comes out of the N pole and flows to the S pole of the second arc extinguishing permanent magnet 41.
At this time, as shown in FIG. 11, the first fixed contact 13 is arranged so as to have a C-shape when viewed from the direction along the permanent magnet center line ML, and the second fixed contact 13 is the second. The conductive plate portion 13c is not arranged at a position that blocks the first arc extinguishing permanent magnet 40. Therefore, the arc generated between the first movable contact 15a and the first fixed contact 13a can be brought closer to the first arc extinguishing permanent magnet 40, and a large Lorentz force F1 can be applied to the arc. ..

Further, the arc generated between the second movable contact 53b of the movable contact 52 and the first fixed contact 14a of the second fixed contact 14 has the arc current flow direction and the first and second arc extinguishing arcs. Due to the relationship with the magnetic flux Φ1 generated by the permanent magnets 40 and 41, it is stretched by the Lorentz force F2 generated by Fleming's left-hand rule.
At this time, the second fixed contact 14 is arranged so as to have a C-shape when viewed from the direction along the permanent magnet center line ML, and the second conductive plate portion 14c of the second fixed contact 14 is the second. 2 It is not arranged at a position that blocks the permanent magnet 41 for arc extinguishing. Therefore, the arc generated between the second movable contact 15b and the second fixed contact 14a can be brought closer to the second arc extinguishing permanent magnet 41, and a large Lorentz force F2 can be applied to the arc.

Therefore, in the electromagnetic contactor 1 of the fourth embodiment, the arc generated between the first movable contact 53a of the movable contactor 52 and the first fixed contact 13a of the first fixed contactor 13 and the movable contactor 52 are the first. Since the large Lorentz forces F1 and F2 act on the arc generated between the two movable contacts 53b and the first fixed contact 14a of the second fixed contactor 14, the arc extinguishing space S1 beyond the permanent magnet center line ML is reached. It is sufficiently stretched to S2, and the arc extinguishing performance can be improved.

(5th and 6th embodiments)
Next, FIG. 12 shows the inside of the contact mechanism 2 of the fifth embodiment constituting the electromagnetic contactor according to the present invention. In FIGS. 12 and 13, the same components as those shown in FIGS. 1 to 5 are designated by the same reference numerals, and the description thereof will be omitted.
This fifth embodiment is a modified structure of the first fixed contactor 13 and the second fixed contactor 14 of the third embodiment shown in FIGS. 8 and 9.
The first fixed contact 13 of the fifth embodiment is formed with an arc runner 13e that is bent from the end of the first conductive plate portion 13b provided with the first fixed contact 13a on the upper surface and extends downward. Although not shown in FIG. 12, the lower end of the arc runner 13e extends toward the bottom of the insulating cylinder portion 18 (see FIG. 2) covering the upper magnetic yoke 21 of the electromagnet unit 20.

The second fixed contact 14 of the fifth embodiment also has an arc runner 14e that is bent from the end of the first conductive plate portion 14b provided with the second fixed contact 14a on the upper surface and extends downward. The lower end of the arc runner 14e also extends toward the bottom of the insulating cylinder portion 18.
According to the electromagnetic contactor 1 of the fifth embodiment, when the contact mechanism 2 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 contactor 13 are fixed. An arc is generated between the contact 13a and the second fixed contact 14a of the second fixed contactor 14, and the current energization state is continued by the arc.

The arc generated at the first fixed contact 13a moves from the first conductive plate portion 13b to the arc runner 13e and is guided to the bottom portion of the insulating cylinder portion 18. Further, the arc generated at the second fixed contact 14a also moves from the first conductive plate portion 14b to the arc runner 14e and is guided to the bottom portion of the insulating cylinder portion 18. In this way, the arcs generated at the first fixed contact 13a and the second fixed contact 14a are stretched, so that they are easily divided and cooled.
Therefore, in the electromagnetic contactor 1 of the fifth embodiment, the arc generated between the first movable contact 15a of the movable contact 15 and the first fixed contact 13a of the first fixed contact 13 and the movable contact 15 are the first. Since the large Lorentz forces F1 and F2 act on the arc generated between the two movable contacts 15b and the first fixed contact 14a of the second fixed contactor 14, the arc extinguishing space S1 beyond the permanent magnet center line ML is reached. The arc runner 13e is provided in the first fixed contactor 13 and the arc runner 14e is provided in the second fixed contactor 14 while being sufficiently stretched in S2 to guide the arc to the bottom of the insulating cylinder portion 18. Therefore, the arc extinguishing performance can be further improved.

Further, FIG. 13 shows the inside of the contact mechanism 2 of the sixth embodiment constituting the electromagnetic contactor according to the present invention.
In the sixth embodiment, the contact mechanism 2 of the fourth embodiment shown in FIGS. 10 and 11 is provided with a first fixed contact 13 provided with the arc runner 13e shown in FIG. 12 and an arc runner 14e. The second fixed contactor 14 is used.
According to the electromagnetic contactor 1 of the sixth embodiment, when the contact mechanism 2 is in the open pole state, the first movable contact 53a and the second movable contact 53b of the movable contactor 52 and the first fixed contactor 13 are fixed. An arc is generated between the contact 13a and the second fixed contact 14a of the second fixed contactor 14, and the current energization state is continued by the arc.

The arc generated at the first fixed contact 13a moves from the first conductive plate portion 13b to the arc runner 13e and is guided to the bottom portion of the insulating cylinder portion 18. Further, the arc generated at the second fixed contact 14a also moves from the first conductive plate portion 14b to the arc runner 14e and is guided to the bottom portion of the insulating cylinder portion 18. In this way, the arcs generated at the first fixed contact 13a and the second fixed contact 14a are stretched, so that they are easily divided and cooled.
Therefore, the electromagnetic contactor 1 of the sixth embodiment also has an arc generated between the first movable contact 53a of the movable contactor 52 and the first fixed contact 13a of the first fixed contactor 13, and the movable contactor 52. Since the large Lorentz forces F1 and F2 act on the arc generated between the two movable contacts 53b and the first fixed contact 14a of the second fixed contactor 14, the arc extinguishing space S1 beyond the permanent magnet center line ML is reached. The arc runner 13e is provided in the first fixed contactor 13 and the arc runner 14e is provided in the second fixed contactor 14 while being sufficiently stretched in S2 to guide the arc to the bottom of the insulating cylinder portion 18. Therefore, the arc extinguishing performance can be further improved.

The contact storage case described in the present invention corresponds to the insulating substrate 6 and the insulating cylinder portion 18, and the first movable contact portion described in the present invention is the first orthogonal plate portion of the second embodiment. The second movable contact portion described in the present invention corresponds to the 50b and the first orthogonal plate portion 52b of the fourth embodiment, and is the second orthogonal plate portion 50c of the second embodiment and the second of the fourth embodiment. It corresponds to the orthogonal plate portion 52c. Further, the facing plate portion described in the present invention corresponds to the intermediate plate portion 43Aa of the first main terminal plate 43A and the intermediate plate portion 43Ba of the second main terminal plate 43B. Further, the pair of protrusions described in the present invention correspond to the conductor portions 11 and 12.

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 13e Arc Runner 14 2nd Fixed Contact 14a 2nd Fixed Contact 14b 1st Conductive Plate 14c 2nd Conductive Plate 14d 3rd Conductive Plate 14e Arc Runner 15 Movable Contact 15a 1st Movable contact 15b 2nd movable contact 18 Insulated cylinder part 20 Electromagnet unit 21 Upper magnetic yoke 21a Through hole 22 Movable plunger 22a Circumferential flange part 23 Through hole 24 Connecting shaft 25 Flange part 26 Contact spring 27 C ring 28 Magnetic yoke 29 Fixed plunger 30 Spool 31 Central cylindrical part 34 Exciting coil 35 Cap 35a Flange part 36 Return spring 37 Drive permanent magnet 39 Auxiliary yoke 40 1st arc extinguishing permanent magnet 41 2nd arc arc extinguishing permanent magnet 42 Magnet support 43A 1st main Terminal plate 43Aa Intermediate plate 43Ab Mounting plate 43Ac External connection plate 43Ab1 Insertion hole 43B Second main terminal plate 43B Intermediate plate 43Bb Mounting plate 43Bc External connection plate 43Bb1 Insertion hole 44A, 44B Fixing bolt 50 Movable contact 50a Intermediate plate 50b 1st orthogonal plate 50c 2nd orthogonal plate 51a 1st movable contact 51b 2nd movable contact 52 Movable contact 52a Intermediate plate 52b 1st orthogonal plate 52c 2nd orthogonal plate 53a 1st movable contact 53b 2nd movable contact KL1, KL2, KL3 Movable contact center line ML Permanent magnet center line MF Common magnetic field Φ1 magnetic flux

Claims (6)

A pair of fixed contacts having fixed contacts in the contact storage case, and a pair of movable contacts having 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. A pair of arc-extinguishing permanent magnets arranged outside the contact storage case, which stretches an arc generated between the fixed contact of the pair of fixed contacts and the pair of movable contacts of the movable contact. In the contact mechanism provided
The pair of fixed contacts are arranged so as to face one of the front and back surfaces on both ends of the movable contact in the longitudinal direction, and the first conductive plate portion having the fixed contact that is in contact with and separated from the movable contact. A second conductive plate portion extending from the end portion of the first conductive plate portion in the front and back directions of the movable contactor, and a second conductive plate portion extending parallel to the first conductive plate portion. It has a C-shape when viewed from the side surface provided with a third conductive plate portion arranged to face the other surface of the front and back surfaces of the movable contact.
Assuming that the line connecting the centers of the pair of arc-extinguishing permanent magnets is the permanent magnet center line and the line connecting the pair of movable contacts of the movable contact is the movable contact center line, the movable contact is the same. The movable contact center line is arranged so as to intersect the permanent magnet center line, and the pair of fixed contacts are arranged along the movable contact center line.
The magnetizing surfaces of the pair of permanent magnets for extinguishing arcs facing each other are magnetized to magnetic poles in which the arc is extended beyond the center line of the permanent magnets .
A first movable contact portion and a second movable contact portion provided with the pair of movable contacts are formed at both ends of the movable contact in the longitudinal direction.
The extending direction of the first movable contact portion and the second movable contact portion is the extending direction of the first conductive plate portion and the second conductive plate portion in which the pair of fixed contacts are arranged in parallel with each other. A contact mechanism characterized by matching to . In the pair of fixed contacts, the opening between the first conductive plate portion and the third conductive plate portion faces the permanent magnet center line side, and the first conductive plate portion and the third conductive plate portion have the first conductive plate portion and the third conductive plate portion. The contact mechanism according to claim 1 , wherein the contact mechanism is arranged so as to extend orthogonally to the center line of the permanent magnet. The pair of fixed contacts are characterized in that an arc runner is formed from the end portion of the first conductive plate portion toward the wall portion of the contact storage case in the direction opposite to the third conductive plate portion. The contact mechanism according to claim 1 and 2 . The contact mechanism according to any one of claims 1 to 3 , wherein the contact storage case is filled with an arc extinguishing gas. A pair of protrusions connected to the pair of fixed contacts are provided on the outside of the contact storage case, and the first main terminal plate and the second main terminal board are connected to the pair of protrusions.
On the first main terminal plate and the second main terminal plate, facing plates arranged in parallel with each other so that the directions of the main currents flowing when the movable contactor comes into contact with the pair of fixed contacts are equal to each other. The contact mechanism according to any one of claims 1 to 4 , wherein a common magnetic field intersecting with a current flowing through the movable contact is generated at these facing plate portions. The contact mechanism according to any one of claims 1 to 5 .
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.

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