JP6359896B2 - Contact mechanism and electromagnetic contactor using the same - Google Patents

Description

  The present invention relates to a contact mechanism that opens and closes a current path and an electromagnetic contactor using the contact mechanism.

  As a contact mechanism applied to an electromagnetic contactor that generates an arc when a current is interrupted, for example, a contact mechanism described in Patent Document 1 is known. The contact mechanism of Patent Document 1 includes a pair of fixed contacts arranged at a predetermined interval, a movable contact arranged so as to be able to contact with and separate from the pair of fixed contacts, and the pair of contacts. And a contact storage case formed of an insulating material that stores the stationary contact and the movable contact. Then, a pair of arc-extinguishing inner permanent magnets, which are magnetized with the same polarity on the opposing magnetic pole surfaces, are arranged close to the movable contact on the opposed inner peripheral surface along the movable contact in the contact housing case. In the contact housing case, at the position of the outer peripheral surface facing each of the pair of arc extinguishing inner permanent magnets, the polarity is the same as that of the arc extinguishing inner permanent magnet and the coercive force is larger than that of the arc extinguishing inner permanent magnet. A pair of arc extinguishing outer permanent magnets are arranged.

  According to this contact mechanism, when an arc is generated between the pair of fixed contacts and the movable contact when the movable contact is in contact with the pair of fixed contacts, the arc is generated between the pair of fixed contacts and the movable contact. The magnetic fluxes from the north pole to the south pole of each pair of the arc extinguishing inner permanent magnet and the arc extinguishing outer permanent magnet that are opposed to each other generate an arc between the pair of fixed and movable contacts. The position is traversed in the longitudinal direction of the movable contact, a Lorentz force is applied to the arc, and the arc is stretched in a direction perpendicular to the longitudinal direction of the movable contact to extinguish the arc.

JP2013-98051A

By the way, the apparatus of patent document 1 is extending the arc only with the magnetic flux generated by a permanent magnet (between the arc extinguishing inner permanent magnet and the arc extinguishing outer permanent magnet). Therefore, when interrupting a large current of several K amperes, the force for stretching the generated arc is insufficient, and the arc extinguishing direction may change to reduce the arc extinguishing performance.
Accordingly, the present invention provides a contact mechanism that can generate a force that sufficiently stretches an arc to improve arc extinguishing performance even when a large current of several kiloamperes is interrupted, and an electromagnetic contactor using the contact mechanism The purpose is to provide.

To achieve the above object, the contact mechanism according to one embodiment of the present invention comprises a pair of fixed contacts having a fixed contact, a movable toward and away a pair of movable contacts fixed contact of the pair of fixed contacts a movable contact provided at both ends in the longitudinal direction, and the contact housing which is formed of an insulating material housing the fixed contacts及beauty friendly dynamic contact of a pair, arc extinguishing secured to the contact housing And a permanent magnet for use. Then, the arc current generated between the fixed contact及beauty Allowed dynamic contact, by the magnetic flux of the permanent magnets for arc extinguishing arc to generate a Lorentz force, a pair of fixed contacts is itself And the movable contact is a conductive plate supported by the movable part, and the longitudinal direction of one surface of the front and back surfaces is configured so that the magnetic flux generated by the current flowing through the magnet matches the magnetic flux of the arc extinguishing permanent magnet A pair of movable contacts are disposed on both ends of the movable contact, and the pair of fixed contacts are disposed at both ends in the longitudinal direction of the movable contact so as to be orthogonal to the longitudinal direction, and have a fixed contact that contacts and separates from the movable contact. Side view comprising: one conductive plate portion; and a second conductive plate portion that is bent from an end portion of the first conductive plate portion that is separated in a direction orthogonal to the movable contact and extends in the front and back direction of the movable contact It is an L-shaped conductive plate.

  Moreover, the electromagnetic contactor which concerns on 1 aspect of this invention WHEREIN: The said movable contact is connected with the movable iron core of the electromagnet for operation, and the said stationary contact is connected to the external connection terminal.

  According to the contact mechanism and the magnetic contactor using the same according to the present invention, the Lorentz force is generated in the arc by the arc current generated between the fixed contact and the movable contact and the magnetic flux of the arc extinguishing permanent magnet. In addition, since the pair of fixed contacts are configured such that the magnetic flux generated by the current flowing through them matches the magnetic flux of the arc extinguishing permanent magnet, a large current is generated between the fixed contact and the movable contact. From the relationship between the magnetic flux generated by the arc extinguishing permanent magnet, the magnetic flux generated by the current flowing through the fixed contact, and the current flow of the arc generated between the fixed contact and the movable contact, Since a large Lorentz force that stretches the arc acts, arc extinction can be reliably performed without changing the arc extension direction.

It is sectional drawing which shows the electromagnetic contactor of 1st Embodiment of this invention. It is the II-II arrow directional view of FIG. It is a perspective view which shows the structure of the stationary contact and movable contact of 1st Embodiment of this invention. It is a figure which shows the inside of the contact storage case of 1st Embodiment of this invention, and the permanent magnet for arc extinguishing fixed to this. 1 shows the current flow direction of a contact mechanism having polarity according to the first embodiment of the present invention. It is a figure which shows generation | occurrence | production of the Lorentz force inside the contact storage case of 1st Embodiment of this invention. It is a VII-VII arrow line view of FIG. It is a VIII-VIII arrow directional view of FIG.

DESCRIPTION OF EMBODIMENTS Hereinafter, modes for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings.
The electromagnetic contactor 1 according to the first embodiment of the present invention shown in FIG. 1 includes a contact mechanism 2 and an electromagnet unit 20 that drives the contact mechanism 2.
The contact mechanism 2 is housed in a contact housing case 4. The contact housing case 4 is made of a metal rectangular tube 5 and an insulating material such as ceramic or synthetic resin material that closes the upper end of the rectangular tube 5. And an insulating substrate 6 formed.

In the rectangular tube 5, the flange portion 7 formed in the lower portion is fixed to the upper magnetic yoke 21 of the electromagnet unit 20 by sealing. Through holes 9 and 10 are formed in the insulating substrate 6 at a predetermined interval.
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) fixed to the insulating substrate 6 via the conductor portions 11 and 12, and these The first and second fixed contacts 13a and 14a provided on the first and second fixed contacts 13 and 14 are provided with a movable contact 15 in which the first and second movable contacts 15a and 15b are opposed to each other.

  A synthetic resin insulating cover 16 that restricts the occurrence of arc is attached to the first fixed contact 13, and a synthetic resin insulating cover 17 that restricts the occurrence of arc is also attached to the second fixed contact 13. Has been. Accordingly, only the first fixed contact 13 a is exposed on the inner peripheral surface of the first fixed contact 13, and only the second fixed contact 14 a is exposed on the inner peripheral surface of the second fixed contact 14.

The movable contact 15 is supported by a connecting shaft 23 fixed to the movable plunger 22 of the electromagnet unit 20, and a through hole 24 through which the connecting shaft 23 is inserted is formed at the center of the movable contact 15.
A flange portion 25 that protrudes outward is formed at the central portion of the connecting shaft 23 in the longitudinal direction. By inserting the connecting shaft 23 into the through hole 24 of the movable contact 15 from the upper end, the movable contact 15 The lower center portion is brought into contact with the flange portion 25 and the contact spring 26 is inserted from the upper portion of the connecting shaft 23. The contact spring 26 applies a predetermined urging force to the movable contact 15 by fixing the upper end of the contact spring 26 with a C ring 27 fixed to the upper end of the connecting shaft 2.

Further, an insulating cylinder portion 18 formed in a bottomed rectangular tube shape is disposed on the inner peripheral surface of the rectangular tube body 6 of the contact housing case 4. The insulating cylinder portion 18 is formed by molding an insulating synthetic resin, for example, and has an insulating function of blocking the influence of the arc on the metal square cylinder body 5.
The electromagnet unit 20 has a U-shaped magnetic yoke 28 that is flat when viewed from the side. A fixed plunger 29 is disposed at the center of the bottom plate of the magnetic yoke 28, and a spool 30 is disposed outside the fixed plunger 29. Has been placed.

  The spool 30 includes a central cylindrical portion 31 through which the fixed plunger 29 is inserted, a lower flange portion 32 projecting radially outward from the lower end portion of the central cylindrical portion 31, and a slightly lower side than the upper end of the central cylindrical portion 31. The upper flange portion 33 projects outward in the radial direction. An exciting coil 34 is wound around a storage space formed by the central cylindrical portion 31, the lower flange portion 32, and the upper flange portion 33.

The upper magnetic yoke 21 fixed to the upper end serving as the open end of the magnetic yoke 28 is formed with a through hole 21 a facing the central cylindrical portion 31 of the spool 30 in the central portion.
An upper portion 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 cylindrical shape, and is formed by extending radially outward at an open end of the cap 35. The flange portion 35 a is sealed and joined to the lower surface of the upper magnetic yoke 21. As a result, a sealed container is formed in which the cap 35 communicates with the upper magnetic yoke 21 through the through hole 21a.

A movable plunger 22 having a return spring 36 disposed at the bottom is inserted into the cap 35 so as to be slidable up and down. The movable plunger 22 is formed with a peripheral flange portion 22 a that protrudes radially outward at an upper end portion that protrudes upward from the upper magnetic yoke 21.
Further, an annular driving permanent magnet 37 is fixed on the upper surface of the upper magnetic yoke 21 so as to surround the outer peripheral circumferential flange portion 22 a of the movable plunger 22. 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 is an N pole and the lower end side is an S pole.

An auxiliary yoke 39 having a through hole 38 having the same outer shape as the driving permanent magnet 37 and an inner diameter smaller than the outer diameter of the peripheral flange portion 22a of the movable plunger 22 is fixed to the upper end surface of the driving permanent magnet 37. The peripheral flange portion 22 a of the movable plunger 22 is in contact with the lower surface of the auxiliary yoke 39.
A gas such as hydrogen gas, nitrogen gas, a mixed gas of hydrogen and nitrogen, air, or SF 6 is sealed in the sealed contact housing case 4.

The movable contact 15 that constitutes the contact mechanism 2 is a conductive plate that is long in the left-right direction in FIG. 1 and made of copper, aluminum, or the like, and has a connecting shaft 23 connected to the center in the longitudinal direction. A first movable contact 15a and a second movable contact 15b are formed on the lower surfaces at both ends in the direction.
As shown in FIGS. 1 to 3, the first fixed contact 13 and the second fixed contact 14 constituting the contact mechanism 2 are C-shaped conductive plates made of copper, aluminum, or the like, and are movable contacts. The elements 15 are spaced apart from each other in the longitudinal direction, and are fixed to the insulating substrate 6 via the conductor portions 11 and 12.

  The first fixed contact 13 is disposed on the first movable contact 15a side of the movable contact 15 in a direction orthogonal to the longitudinal direction, and faces the first movable contact 15a of the movable contact 15 from below. The first conductive plate portion 13b provided with the first fixed contact 13a on the upper surface, and the second conductive member bent from the end of the first conductive plate portion 13b away from the movable contact 15 and extending upward. A plate portion 13c and 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 are provided.

  The second fixed contact 14 is disposed perpendicular to the longitudinal direction on the second movable contact 15 b side of the movable contact 15 and parallel to the first fixed contact 13. 2 is opposed to the movable contact 15b from the lower side and is bent from the end of the first conductive plate 14b provided with the second fixed contact 14a on the upper surface and the first conductive plate 14b away from the movable contact 15 And 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. .

The movable contact 15 is in a released state, and the movable contacts 15a, 15a located on both ends in the longitudinal direction and the fixed contacts 13a, 14a of the fixed contacts 13, 14 are spaced apart from each other with a predetermined interval. It becomes.
Further, the movable contact 15 is set so that the movable contacts 15 a and 15 b are in contact with the fixed contacts 13 a and 14 a of the fixed contacts 13 and 14 with a predetermined contact pressure by the contact spring 26 at the closing position. .

On the other hand, as shown in FIG. 4, first to fourth arc extinguishing permanent magnets 40 to 43 are arranged on the outer periphery of the rectangular tube 5.
The first arc extinguishing permanent magnet 40 is fixed to the outer peripheral surface of the rectangular tube 5 facing the one side surface 15c in the width direction of the movable contact 15, and the second arc extinguishing permanent magnet 41 is The movable contact 15 is fixed to the outer peripheral surface of the rectangular tube 5 facing the other side surface 15d in the width direction.

The first and second arc extinguishing side permanent magnets 41 and 42 are magnetized so that the magnetic pole surfaces in contact with the rectangular tube 5 in the thickness direction are N poles.
The third arc extinguishing permanent magnet 42 is fixed to the outer peripheral surface of the rectangular tube 5 facing one side surface 15e in the longitudinal direction of the movable contact 15, and the fourth arc extinguishing permanent magnet 43. Is fixed to the outer peripheral surface of the rectangular tube 5 facing the other side surface 15f in the longitudinal direction of the movable contact 15.

The third and fourth arc extinguishing side permanent magnets 42 and 43 are magnetized so that the magnetic pole surface in contact with the rectangular tube 5 in the thickness direction becomes the S pole.
Thereby, since the 1st-4th arc extinguishing permanent magnets 40-44 are being fixed to the outer peripheral surface of the square cylinder 5 which comprises the contact storage case 4, the permanent magnet 40 for 1st arc extinguishing is fixed. The magnetic flux φ1 flowing out from the N pole and flowing into the S pole of the third arc extinguishing permanent magnet 42 and the S pole of the third arc extinguishing permanent magnet 42 coming out of the N pole of the second arc extinguishing permanent magnet 41 The magnetic flux φ1 flowing through the first fixed contact 13 passes through the vicinity of the opposed portion of the first fixed contact 13a of the first fixed contact 13 and the first movable contact 15a of the movable contact 15, and increases in magnetic flux density toward the left side in the left-right direction. Cross at.

  Further, the magnetic flux φ1 that flows out from the N pole of the first arc extinguishing permanent magnet 40 and flows into the S pole of the fourth arc extinguishing permanent magnet 43 and the N pole of the second arc extinguishing permanent magnet 41. The magnetic flux φ1 flowing through the S pole of the fourth arc extinguishing permanent magnet 43 passes near a portion where the second fixed contact 14a of the second fixed contact 14 and the second movable contact 15b of the movable contact 15 are opposed to each other. Crossing with a large magnetic flux density toward the right side in the horizontal direction.

  Further, as shown in FIG. 4, the pair of fixed contacts 13, 14 arranged in the contact housing case 4 are arranged on both ends in the longitudinal direction of the movable contact 15 and on the other side surface 15 d side in the width direction. The arc extinguishing space 45 is disposed on one side 15c side in the width direction of the movable contact 15 opposite to the pair of fixed contacts 13 and 14, and extends in a direction orthogonal to the direction. 46 is formed.

Here, the insulating case of the present invention corresponds to the insulating covers 16 and 17 and the insulating cylindrical portion 18, and the fixed contact of the present invention corresponds to the first fixed contact 13a and the second fixed contact 14a, and the pair of movable members of the present invention. The contact corresponds to the first movable contact 15a and the second movable contact 15b, the arc extinguishing permanent magnet of the present invention corresponds to the first to fourth arc extinguishing permanent magnets 40 to 43, and the movable iron core of the present invention. Corresponds to the movable plunger 22, and the electromagnet for operation of the present invention corresponds to the electromagnet unit 20.
Next, operation | movement of the electromagnetic contactor 1 of 1st Embodiment is demonstrated with reference to FIG.5 and FIG.6.

In the electromagnetic contactor 1 of the first embodiment, a positive (+) terminal is connected to the first fixed contact 13 and a negative (−) terminal is connected to the second fixed contact 14. This is a polar electromagnetic contactor 1 with a limited flow direction.
Now, it is assumed that the exciting coil 34 of the electromagnet unit 20 is in a non-energized state and the electromagnet unit 20 is in a released state in which the exciting force for lowering the movable plunger 22 is not generated.

  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 generated by 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. For this reason, the upper surface of the peripheral flange portion 22 a of the movable plunger 22 is in contact with the lower surface of the auxiliary yoke 39.

  Therefore, the first movable contact 15 a and the second movable contact 15 b of the movable contact 15 of the contact mechanism 2 connected to the movable plunger 22 via the connecting shaft 23 are the first fixed contact of the first fixed contact 13. 13a is spaced apart from the second fixed contact 14a of the second fixed contact 14 upward by a predetermined distance. For this reason, the current path between the first fixed contact 13 and the second fixed contact 14 is in a cut-off 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 force is generated in the electromagnet unit 20, and the movable plunger 22 is resisted against the urging force of the return spring 36 and the attracting force of the driving permanent magnet 37. Press down. The lowering of the movable plunger 22 stops when the lower surface of the peripheral flange portion 22 a hits the upper surface of the upper magnetic yoke 21.
In this way, when the movable plunger 22 is lowered, the movable contact 15 connected to the movable plunger 22 via the connecting shaft 23 is also lowered, and the first movable contact 15a of the movable contact 15 of the contact mechanism 2 is lowered. The second movable contact 15 b comes into contact with the first fixed contact 13 a of the first fixed contact 13 and the second fixed contact 14 a of the second fixed contact 14 with the contact pressure of the contact spring 26.

For this reason, a large current from the power supply source is brought into a closed state in which it is supplied to the load device through the first fixed contact 13, the movable contact 15, and the second fixed contact 14.
When the current supply to the load device is interrupted from the closed state of the contact mechanism 2, the energization to the excitation coil 34 of the electromagnet unit 20 is stopped.
When the energization of the exciting coil 34 is stopped, the exciting force for moving the movable plunger 22 downward by the electromagnet unit 20 disappears, so that the movable plunger 22 rises by the urging force of the return spring 36, and the peripheral flange portion 22a becomes the auxiliary yoke. As it approaches 39, the attractive force of the drive permanent magnet 37 increases.

  As the movable plunger 22 rises, the movable contact 15 connected via the connecting shaft 23 rises. Accordingly, when contact pressure is applied by the contact spring 26, the first movable contact 15 a and the second movable contact 15 b of the movable contact 15 are connected to the first fixed contact 13 a and the second fixed contact 13 of the first fixed contact 13. The contact 14 is in contact with the second fixed contact 14a. After that, when the contact pressure of the contact spring 26 disappears, the movable contact 15 is in a contact opening start state in which the movable contact 15 is separated upward from the first fixed contact 13 and the second fixed contact 14.

  When the opening is started, a first arc 50 is generated between the first movable contact 15a of the movable contact 15 and the first fixed contact 13a of the first fixed contact 13 as shown in FIG. The second arc 51 is generated between the second movable contact 15 b of the movable contact 15 and the first fixed contact 14 a of the second fixed contact 14, and the current conduction state is continued by the arcs 50 and 51. Will be. At this time, the current direction of the first arc 50 is a direction from the first fixed contact 13a to the first movable contact 15a, and the current direction of the second arc 51 is from the second movable contact 15b to the second fixed contact 14a. It is the direction to go.

Here, as shown in FIG. 6, the magnetic flux φ <b> 1 that flows out from the N pole of the first arc extinguishing permanent magnet 40 and flows to the S pole of the third arc extinguishing permanent magnet 42, and the second arc extinguishing permanent The magnetic flux φ1 flowing out from the N pole of the magnet 41 and flowing to the S pole of the third arc extinguishing permanent magnet 42 passes near the first arc 50 and is on one side surface 15e in the longitudinal direction of the movable contact 15. Occurs outward.
Further, the magnetic flux φ1 that flows out from the N pole of the first arc extinguishing permanent magnet 40 and flows into the S pole of the fourth arc extinguishing permanent magnet 43 and the N pole of the second arc extinguishing permanent magnet 41. A magnetic flux φ1 flowing in the S pole of the fourth arc extinguishing permanent magnet 43 is generated toward the outside of the other side surface 15f in the longitudinal direction of the moving contact 15 by passing near the second arc 51.

In the opening start state, as shown in FIG. 7, the first fixed contact 13 is arranged in the order of the conductor portion 11 to the third conductive plate portion 13 d, the second conductive plate portion 13 c, and the first conductive plate portion 13 b. Current flows, and a magnetic flux φ2 due to the current is generated around each third conductive plate portion 13d, second conductive plate portion 13c, and first conductive plate portion 13b.
Further, as shown in FIG. 8, a current flows through the second fixed contact 14 in the order of the first conductive plate portion 14b, the second conductive plate portion 14c, and the third conductive plate portion 13d. Magnetic flux φ2 due to current is generated around the portion 14b, the second conductive plate portion 14c, and the third conductive plate portion 13d.

  Between the first fixed contact 13a of the first fixed contact 13 and the first movable contact 15a of the movable contact 15, as shown in FIG. 7, the first fixed contact 13a side to the first movable contact 15a side One arc 50 flows, and a magnetic flux φ1 generated by the first arc extinguishing permanent magnet 40, the second arc extinguishing permanent magnet 41, and the third arc extinguishing permanent magnet 42 is one of the longitudinal directions of the movable contact 15. The magnetic flux φ2 is generated by the current that flows toward the outside of the side surface 15e and flows through the first fixed contact 13. As a result, from the relationship between the current flow of the first arc 50 and the magnetic fluxes φ1 and φ2, the direction in which the first fixed contact 13 is not arranged perpendicular to the movable contact 15 according to the Fleming left-hand rule, that is, the movable A large Lorentz force F1 is generated on the side facing the arc extinguishing space 45 on the side surface 15c side in the width direction of the contact 15 (see FIGS. 6 and 7).

By this Lorentz force F1, the first arc 50 generated between the first fixed contact 13a and the first movable contact 15a is stretched toward the arc extinguishing space 45.
Further, between the second fixed contact 14a of the second fixed contact 14 and the second movable contact 15b of the movable contact 15, as shown in FIG. 8, from the second movable contact 15b side to the second fixed contact 14a side. The second arc 51 flows through the first arc extinguishing permanent magnet 40, the second arc extinguishing permanent magnet 41, and the fourth arc extinguishing permanent magnet 43 so that the magnetic flux φ1 is generated in the longitudinal direction of the movable contact 15. Is generated toward the outside of the other side surface 15f, and a magnetic flux φ2 is generated by the current flowing through the second fixed contact 14. As a result, from the relationship between the current flow of the second arc 51 and the magnetic fluxes φ1 and φ2, the direction in which the second fixed contact 14 is not disposed perpendicular to the movable contact 15 according to the Fleming left-hand rule, that is, the movable A large Lorentz force F2 is generated on the side facing the arc extinguishing space 46 on the side surface 15c side in the width direction of the contact 15 (see FIGS. 6 and 8).

By this Lorentz force F2, the second arc 51 generated between the second fixed contact 14a and the second movable contact 15b is stretched toward the arc extinguishing space 46.
Further, as shown in FIG. 7, the direction in which the current of the first arc 50 flows and the direction of the current flowing in the second conductive plate portion 13 c of the first fixed contact 13 are reversed. Due to this, the electromagnetic repulsive force works and the first arc 50 is stretched toward the arc extinguishing space 45.

Furthermore, as shown in FIG. 8, the direction of the current flowing through the second arc 51 and the direction of the current flowing through the second conductive plate portion 14c of the second fixed contact 14 are reversed, and the currents in the opposite directions are reversed. Due to this, the electromagnetic repulsive force works, and the second arc 51 is stretched toward the arc extinguishing space 46.
Therefore, according to the first embodiment, the first arc extinguishing permanent magnet 40, the second arc extinguishing even if a large current of several K amperes flows between the first fixed contact 13a and the first movable contact 15a. A magnetic flux φ1 generated by the arc permanent magnet 41 and the third arc extinguishing permanent magnet 42, a magnetic flux φ2 generated by a current flowing through the first fixed contact 13, a first fixed contact 13a and a first movable contact 15a Since the large Lorentz force F1 that stretches the first arc 50 toward the arc extinguishing space 45 acts on the relationship with the current flow of the first arc 50 generated during this period, the extension direction of the first arc 50 changes. Without this, the first arc 50 can be reliably extinguished. Similarly, even if a large current of several K amperes flows between the second fixed contact 14a and the second movable contact 15b, the first arc extinguishing permanent magnet 40, the second arc extinguishing permanent magnet 41, and the second The magnetic flux φ1 generated by the four-arc extinguishing permanent magnet 43, the magnetic flux φ2 generated by the current flowing through the second fixed contact 14, and the second generated between the second fixed contact 14a and the second movable contact 15b. From the relationship with the current flow of the arc 51, a large Lorentz force F2 that stretches the second arc 51 toward the arc extinguishing space 46 acts, so that the second arc 51 does not change and the second arc 51 does not change. 51 can be reliably extinguished.

  Further, the direction in which the current of the first arc 50 flows and the direction of the current flowing in the second conductive plate portion 13c of the first fixed contact 13 are reversed, and the action of the electromagnetic repulsive force due to the reverse direction of these currents. Since the first arc 50 is further extended toward the arc extinguishing space 45, the arc extinguishing of the first arc 50 can be promoted. Similarly, the direction in which the current of the second arc 51 flows and the direction of the current flowing in the second conductive plate portion 14c of the second stationary contact 14 are reversed, and the action of electromagnetic repulsive force due to the reverse direction of these currents. Since the second arc 51 is further stretched toward the arc extinguishing space 46, the arc extinguishing of the second arc 51 can be promoted.

  In the first embodiment described above, the first fixed contact 13 (and the second fixed contact 14) constituting the contact mechanism 2 is formed of a C-shaped conductive plate in a side view. For example, the first movable contact 15a (and the second movable contact 15b side) of the movable contact 15 and the first movable contact 15a (and the second movable contact 15b) from the lower side are not limited thereto. Oppositely, the first conductive plate portion provided with the first fixed contact (and the second fixed contact) on the upper surface and the first conductive plate portion remote from the movable contact 15 are bent and extended upward. It may be a conductive plate having an L shape in a side view and formed of a second conductive plate portion.

  In the first embodiment, the first to fourth arc extinguishing permanent magnets 40 to 43 are fixed to the outer peripheral surface of the rectangular tube 5 constituting the contact housing case 4. However, the present invention is not limited to this. Instead, it forms a magnetic flux that passes near the opposed portion of the first fixed contact 13a of the first fixed contact 13 and the first movable contact 15a of the movable contact 15 toward the left in the left-right direction, and the second Any other shape can be used as long as it forms a magnetic flux that passes near the opposing portion of the second fixed contact 14a of the fixed contact 14 and the second movable contact 15b of the movable contact 15 and moves to the right in the left-right direction. The permanent magnet may be arranged.

DESCRIPTION OF SYMBOLS 1 ... Electromagnetic contactor, 2 ... Contact mechanism, 4 ... Contact storage case, 5 ... Square cylinder body, 6 ... Insulating substrate, 7 ... Flange part, 9,10 ... Through-hole, 11, 12 ... Conductor part, 13th 1 fixed contact, 13a ... 1st fixed contact, 13b ... 1st conductive plate part, 13c ... 2nd conductive plate part, 13d ... 3rd conductive plate part, 14 ... 2nd fixed contact, 14a ... 2nd fixed contact , 14b ... 1st conductive plate part, 14c ... 2nd conductive plate part, 14d ... 3rd conductive plate part, 15 ... movable contact, 15a ... 1st movable contact, 15b ... 2nd movable contact, 15c ... movable contact 15d: the other side surface in the longitudinal direction of the movable contact, 15e: one side surface in the longitudinal direction of the movable contact, 15f: the other side surface in the longitudinal direction of the movable contact, 16, 17 ... Insulating cover, 18 ... Insulating cylinder part, 20 ... Electromagnet unit, 21 ... Upper magnetic yoke, 21a Through hole, 22 ... movable plunger, 23 ... connecting shaft, 24 ... through hole, 25 ... flange, 26 ... contact spring, 27 ... C ring, 28 ... magnetic yoke, 29 ... fixed plunger, 30 ... spool, 31 ... center Cylindrical part, 32 ... lower flange part, 33 ... upper flange part, 34 ... exciting coil, 35 ... cap, 36 ... return spring, 37 ... permanent magnet for driving, 38 ... through hole, 39 ... auxiliary yoke, 40 ... first Arc extinguishing permanent magnet, 41 ... second arc extinguishing permanent magnet, 42 ... third arc extinguishing permanent magnet, 43 ... fourth arc extinguishing permanent magnet, 45, 46 ... arc extinguishing space, 50 ... 1st arc, 51 ... 2nd arc, F1, F2 ... Lorentz force

Claims (4)

A pair of fixed contacts having fixed contacts;
A movable contact provided with a pair of movable contacts that can be brought into and out of contact with the fixed contact of the pair of fixed contacts on both ends in the longitudinal direction; and
An insulating case formed of an insulating material storing the pair of fixed contacts and the movable contact;
An arc extinguishing permanent magnet fixed to the insulating case,
The arc current generated between the fixed contact and the movable contact and the magnetic flux of the arc extinguishing permanent magnet generate a Lorentz force in the arc ,
The pair of fixed contacts are configured such that a magnetic flux generated by a current flowing through the pair of stationary contacts matches a magnetic flux of the arc extinguishing permanent magnet ,
The movable contact is a conductive plate supported by a movable part, and has the pair of movable contacts on both ends in the longitudinal direction of one surface of the front and back surfaces.
The pair of fixed contacts are arranged at both ends in the longitudinal direction of the movable contactor so as to be orthogonal to the longitudinal direction, and have a first conductive plate portion having the fixed contact contacting and moving away from the movable contact;
A side view L-shape comprising: a second conductive plate portion that is bent from an end portion of the first conductive plate portion that is separated in a direction orthogonal to the movable contact member and extends in a front-back direction of the movable contact member. A contact mechanism characterized by being a conductive plate . The pair of fixed contacts are C -shaped conductive plates having a third conductive plate portion extending in parallel to the first conductive plate portion from an end portion of the second conductive plate portion. The contact mechanism according to claim 1. The contact mechanism according to claim 2, wherein the arc extinguishing permanent magnet is arranged such that a magnetic flux flows outward in a longitudinal direction of the movable contact . A contact mechanism according to any one of claims 1 to 3,
The electromagnetic contactor, wherein the movable contact is coupled to a movable iron core of an operating electromagnet, and the fixed contact is connected to an external connection terminal.

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