JP6455171B2 - Magnetic contactor - Google Patents

Description

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

  As an electromagnetic contactor in which an arc is generated when a current is interrupted, for example, one described in Patent Document 1 is known. The electromagnetic contactor disclosed in 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. And a contact storage case formed of an insulating material for storing the fixed contact and the movable contact. Then, a pair of arc-extinguishing inner permanent magnets having the opposite magnetic pole surfaces magnetized to the same polarity are brought close to the movable contact on the opposed inner peripheral surface along the width direction of the movable contact in the contact storage case. Arranged at the outer peripheral surface facing each of the pair of arc extinguishing inner permanent magnets of the contact storage case and having the same polarity as the arc extinguishing inner permanent magnet and the coercive force of the arc extinguishing inner permanent magnet. A pair of outer permanent magnets for arc extinguishing are arranged.

  According to this electromagnetic contactor, when an arc is generated between the pair of fixed contacts and the movable contact when the movable contact is in contact between the pair of fixed contacts and the release state, the arc is generated between the pair of fixed contacts and the movable contact. The magnetic flux 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, which are arranged opposite to each other, forms an arc between the pair of fixed and movable contacts. The longitudinal position of the movable contact crosses the generated position, a Lorentz force is applied to the arc, and the arc is extended in a direction perpendicular to the longitudinal direction of the movable contact to extinguish the arc. .

JP2013-98051A

By the way, as for the electromagnetic contactor of patent document 1, the space which crosses a longitudinal direction from the both ends of the longitudinal direction of a movable contact is arc extinguishing space. When a large current is interrupted, it is necessary to sufficiently extend the arc in the arc extinguishing space. However, the electromagnetic contactor of Patent Document 1 has a short distance from both ends in the longitudinal direction to the inner wall of the contact housing case, It cannot be extended sufficiently. If a large arc extinguishing space is used to sufficiently extend the arc, there is a problem in terms of increasing the size of the electromagnetic contactor.
Then, this invention aims at providing the electromagnetic contactor which can ensure an arc extinguishing function, aiming at size reduction.

In order to achieve the above object, an electromagnetic contactor according to an aspect of the present invention includes a pair of fixed contacts having fixed contacts and a pair of movable contacts that can be contacted and separated from the fixed contacts of the pair of fixed contacts. A movable contact provided at both ends in the longitudinal direction, an insulating case formed of an insulator containing the pair of fixed contacts and the movable contact, and a width of the movable contact. A pair of arc extinguishing permanent magnets having opposite pole faces facing each other with the same polarity, and an arc extinguishing space provided at positions facing outward in the width direction from both longitudinal ends of the movable contact in the insulating case A pair of arc extinguishing permanent magnets, wherein the first magnetic flux generated outward in the longitudinal direction of the movable contact is arc extinguished against the arc generated between the fixed contact and the movable contact. Acts on the first Lorentz force toward the arc space And a second magnetic flux that wraps between the opposing magnetic pole surface and the magnetic pole surface on the back side of the opposing magnetic pole surface at the ends of the pair of arc extinguishing permanent magnets is generated in the vicinity of the arc extinguishing space. The second Lorentz force in a direction different from the direction in which the first Lorentz force is applied to the arc moved to the arc, and the pair of arc extinguishing permanent magnets are arranged in the width direction of the movable contact inside the insulating case. It was arranged along both sides .

  According to the electromagnetic contactor according to the present invention, it is possible to ensure an arc extinguishing function when a large current is interrupted while achieving downsizing.

It is sectional drawing which shows the electromagnetic contactor of 1st Embodiment of this invention. It is sectional drawing which showed the contact mechanism which comprises the electromagnetic contactor of 1st Embodiment by planar view. It is the figure which showed typically the magnetic flux of the permanent magnet which comprises a contact mechanism. It is the figure which showed the opening start state which comprises the electromagnetic contactor of 1st Embodiment. It is sectional drawing which showed the contact mechanism which comprises the electromagnetic contactor of 2nd Embodiment of this invention by planar view. It is sectional drawing which showed the contact mechanism which comprises the electromagnetic contactor of 3rd Embodiment of this invention by planar view.

Embodiments of the present invention will be described below with reference to the drawings. Note that in each embodiment, the same components are denoted by the same reference numerals, and description thereof is omitted.
[First Embodiment]
The electromagnetic contactor 1 according to the first embodiment of the present invention shown in FIGS. 1 to 3 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. The formed insulating substrate 6 and a bottomed rectangular tube-shaped insulating cylinder portion 18 disposed inside the rectangular tube body 5 and joined to the lower surface of the insulating substrate 6 are provided. The insulating cylinder part 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.

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 14) fixed to the insulating substrate 6 via the conductor portions 11 and 12, 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. .

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 is fixed to the movable contact 15 by fixing the upper end of the contact spring 26 with a spring receiver 27 fixed to the upper end side of the connecting shaft 23 via a C ring (or E ring) 27a. The urging power of is granted.

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. Is arranged.
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 peripheral 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 having 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 yoke 39.
Various gases for arc extinguishing are sealed in the sealed contact housing case 4.

The movable contact 15 constituting the contact mechanism 2 is a conductive plate that is long in the left-right direction in FIG. 1 and is made of a conductive material. A connecting shaft 23 is connected to the center in the longitudinal direction, and the longitudinal direction The first movable contact 15a and the second movable contact 15b are formed on the lower surfaces of both ends of the first and second movable contacts 15a and 15b.
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 in a side view made of a conductive material, and are movable. The contact 15 is spaced apart from both ends in the longitudinal direction, and is fixed to the insulating substrate 6 via the conductor portions 11 and 12.

  The first fixed contact 13 is disposed at one end in the longitudinal direction on the first movable contact 15a side of the movable contact 15, 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 plate portion bent upward from the end portion of the first conductive plate portion 13b away from the movable contact 15 and extending upward. 13 c and a third conductive plate portion 13 d that is bent from the upper end of the second conductive plate portion 13 c and extends above the movable contact 15.

  The second fixed contact 14 is disposed at the other end in the longitudinal direction on the second movable contact 15b side of the movable contact 15, and faces the second movable contact 15b of the movable contact 15 from below, The first conductive plate portion 14b provided with the second fixed contact 14a on the upper surface, and the second conductive plate portion bent upward from the end portion of the first conductive plate portion 14b away from the movable contact 15 and extending upward. 14 c and a third conductive plate portion 14 d that is bent from the upper end of the second conductive plate portion 14 c and extends above the movable contact 15.

  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.

A C-shaped magnetic body as viewed from above so as to cover the inner surface of the second conductive plate portion 13c of the first fixed contact 13 and the inner surface of the second conductive plate portion 14c of the second constant contact 14 Plates 19a and 19b are mounted. Thereby, the magnetic field generated by the current flowing through the first conductive plate portions 13b and 14b can be shielded.
In the released state, the movable contact 15 is in a state in which the movable contacts 15a and 15a 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.

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. .
As shown in FIG. 2, first and second arc extinguishing permanent magnets 40 and 41 having S poles as magnetic pole faces facing each other are arranged on the outer periphery of a rectangular tube 5 constituting the contact housing case 4. Yes.

A rectangular metal support 60 made of metal that fixes the first and second arc extinguishing permanent magnets 40 and 41 to the inner wall is disposed outside the rectangular cylinder 5. It is being fixed to the inner wall of the electromagnetic contactor cover 50 which covers the contact mechanism 2 and the electromagnet unit 20 (refer FIG. 1).
The first arc extinguishing permanent magnet 40 is opposed to one side surface 15 c in the width direction of the movable contact 15 via the square cylinder 5 and the insulating cylinder portion 18, and one of the movable contact 15 on the longitudinal direction side is disposed. It is fixed to the magnet support 60 so that the end 40a is located near one movable contact 15a and the other end 40b on the longitudinal side of the movable contact 15 is located near the other movable contact 15a. Yes.

The second arc extinguishing permanent magnet 41 is opposed to the other side surface 15d in the width direction of the movable contact 15 via the square cylinder 5 and the insulating cylinder portion 18, and is disposed on one side of the movable contact 15 on the longitudinal direction side. It is fixed to the magnet support body 60 so that the end 41a is located near one movable contact 15a and the other end 41b on the longitudinal side of the movable contact 15 is located near the other movable contact 15a. Yes.
The first and second arc extinguishing permanent magnets 40 and 41 are magnetized so that the magnetic pole faces facing the rectangular tube 5 in the thickness direction are N poles.

In addition, a first inner wall 61 is formed on the bottom of the insulating cylindrical portion 18 between the first fixed contact 13a and the second fixed contact 14a along one side surface 15c in the width direction of the movable contact 15 so that the movable contact 15 can move. A second inner wall 62 is formed between the first fixed contact 13a and the second fixed contact 14a along the other side surface 15d in the width direction of the child 15.
Then, as shown in FIG. 2, both ends of the movable contact 15 in the longitudinal direction (connection positions of the first fixed contact 13a and the first movable contact 15a, the second fixed contact 14a and the second fixed contact 15a) are provided inside the insulating cylinder portion 18. First to fourth arc extinguishing spaces 42 to 45 are provided at positions that extend outward in the width direction of the movable contact 15 from the connection position of the movable contact 15b.

  Further, a first arc extension that extends in the longitudinal direction of the movable contact 15 and communicates with the first and second arc extinguishing spaces 42 and 43 between the first inner wall 61 and the side wall 18 a of the insulating cylinder portion 18. A space 46 is formed, and the third and fourth arc extinguishing spaces 44 extend in the longitudinal direction of the movable contact 15 between the second inner wall 62 of the insulating cylinder 18 and the side wall 18b of the insulating cylinder 18. , 45, a second arc extension space 47 is formed.

  Here, FIG. 3 is a diagram schematically showing the state of generation of the magnetic flux of the first arc extinguishing permanent magnet 40, and the rear surface of the first arc extinguishing permanent magnet 40 comes out from the N pole magnetic pole surface. The outer magnetic flux out of the magnetic flux flowing in a loop on the magnetic pole surface of the S pole is φ1, and the inner magnetic flux wrapping around from the N magnetic pole surface to the back S magnetic pole surface at both ends 40a and 40b is φ2. And The second arc extinguishing permanent magnet 41 also has an outer magnetic flux φ1 out of the magnetic flux that comes out of the N-pole magnetic pole surface and flows to the S-pole magnetic pole face on the back surface, and N at both ends 41a and 41b. An inner magnetic flux that wraps around from the magnetic pole surface of the pole to the magnetic pole surface of the S pole on the back surface is defined as φ2.

Then, as shown in FIG. 2, the magnetic flux φ1 outside the first arc extinguishing permanent magnet 40 passes near the facing portion between the first fixed contact 13a and the first movable contact 15a, and the left side in the left-right direction. Crossing with a large magnetic flux density toward the right and passing near the opposing portion of the second fixed contact 14a and the second movable contact 15b and crossing with a large magnetic flux density toward the right side in the left-right direction.
Further, the magnetic flux φ2 inside the both end portions 40a, 40b of the first arc extinguishing permanent magnet 40 is from the N pole pole surface in the vicinity of the communication position of the first arc extinguishing space 42 and the first arc extension space 46. It occurs around the magnetic pole surface of the S pole on the back surface, and rotates from the magnetic pole surface of the N pole to the magnetic pole surface of the S pole on the back surface in the vicinity of the communication position of the second arc extinguishing space 43 and the first arc extension space 46. Occur.

Further, the magnetic flux φ1 outside the second arc extinguishing permanent magnet 41 passes near the opposing portion of the first fixed contact 13a and the first movable contact 15a and has a large magnetic flux density toward the left side in the left-right direction. In addition to crossing, it passes near the opposing portion of the second fixed contact 14a and the second movable contact 15b and crosses with a large magnetic flux density toward the right side in the left-right direction.
Further, the magnetic flux φ2 inside the both end portions 41a and 41b of the second arc extinguishing permanent magnet 41 is from the N pole magnetic pole surface in the vicinity of the communication position of the third arc extinguishing space 44 and the second arc extension space 47. This occurs around the magnetic pole surface of the S pole on the back surface, and rotates from the magnetic pole surface of the N pole to the magnetic pole surface of the S pole on the back surface in the vicinity of the communication position of the fourth arc extinguishing space 45 and the second arc extension space 47. Occur.

Next, operation | movement of the electromagnetic contactor 1 of 1st Embodiment is demonstrated with reference to FIGS. 1-4.
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.
As shown in FIG. 1, it is assumed that the exciting coil 34 of the electromagnet unit 20 is in a non-excited state and the electromagnet unit 20 is in a released state in which no exciting force for lowering the movable plunger 22 is 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, excitation to the excitation coil 34 of the electromagnet unit 20 is stopped.
When the excitation to 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 is lost, 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.

  In such a contact opening start state, as shown in FIG. 2, a first arc (not shown) is formed between the first movable contact 15 a of the movable contact 15 and the first fixed contact 13 a of the first fixed contact 13. ) Occurs, and a second arc (not shown) is generated between the second movable contact 15b of the movable contact 15 and the second fixed contact 14a of the second fixed contact 14, and current is passed by these arcs. The state will continue. At this time, the current direction of the first arc is a direction from the first fixed contact 13a to the first movable contact 15a, and the current direction of the second arc is a direction from the second movable contact 15b to the second fixed contact 14a. It is.

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. 4, the magnetic flux φ1 outside the first arc extinguishing permanent magnet 40 and The magnetic flux φ1 outside the second arc extinguishing permanent magnet 41 is generated toward the outside of one side surface 15c in the longitudinal direction of the movable contact 15 through the vicinity of the first arc.
Accordingly, the Lorentz on the side toward the first arc extinguishing space 42 on the side surface 15c side in the width direction of the movable contact 15 is determined by the Fleming left-hand rule from the relationship between the current flow of the first arc and the outer magnetic flux φ1. A force F1 is generated (see FIG. 4).

Due to the Lorentz force F1, the first arc generated between the first fixed contact 13a and the first movable contact 15a is stretched toward the first arc extinguishing space 42.
Then, the first arc stretched toward the first arc extinguishing space 42 is such that the magnetic flux φ2 inside the first arc extinguishing permanent magnet 40 causes the first arc extinguishing space 42 and the first arc extension space 46 to Since it is generated from the N pole pole surface to the back S pole pole surface in the vicinity of the communication position, Fleming's left-hand rule is derived from the relationship between the current flow of the first arc and the inner magnetic flux φ2. The Lorentz force F2 is generated on the side facing the first arc extension space 46 in a direction different from the Lorentz force F2. Then, the first arc extended in the first arc extinguishing space 42 enters the first arc extension space 46 and is further extended by the Lorentz force F2.

Further, between the second fixed contact 14a of the second fixed contact 14 and the second movable contact 15b of the movable contact 15, the magnetic flux φ1 outside the first arc extinguishing permanent magnet 40 and the second arc extinguishing. A magnetic flux φ1 outside the arc permanent magnet 41 is generated toward the outside of one side surface 15c in the longitudinal direction of the movable contact 15 through the vicinity of the second arc.
As a result, from the relationship between the current flow of the second arc and the outer magnetic flux φ1, the side toward the second arc extinguishing space 43 on the side surface 15c side in the width direction of the movable contact 15 is large according to the Fleming left-hand rule. Lorentz force F3 is generated.

The second arc generated between the second fixed contact 14 a and the second movable contact 15 b is extended toward the second arc extinguishing space 43 by the Lorentz force F3.
Then, the second arc stretched toward the second arc extinguishing space 43 has a magnetic flux φ2 inside the first arc extinguishing permanent magnet 40 so that the second arc extinguishing space 43 and the first arc extension space 46 Since it is generated in the vicinity of the communication position from the N pole face to the S pole face on the back side, the Fleming's left-hand rule is derived from the relationship between the current flow of the second arc and the inner magnetic flux φ2. A Lorentz force F4 is generated on the side facing the first arc extension space 46 in a direction different from the Lorentz force F3. Then, the second arc extended to the second arc extinguishing space 43 by the Lorentz force F4 enters the first arc extension space 46 and is further extended.

  Here, the insulating case of the present invention corresponds to the insulating substrate 6 and the insulating cylinder portion 18, 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 contacts of the present invention includes Corresponding to the first movable contact 15a and the second movable contact 15b, the arc extinguishing space of the present invention corresponds to the first to fourth arc extinguishing spaces 42 to 45, and the first magnetic flux of the present invention is an outer magnetic flux. corresponding to φ1, the first Lorentz force of the present invention corresponds to Lorentz forces F1 and F3, the second Lorentz force of the present invention corresponds to Lorentz forces F2 and F4, and the second magnetic flux of the present invention is an inner magnetic flux φ2. The arc extension space of the present invention corresponds to the first arc extension space 46 and the second arc extension space 47.

Next, the function and effect of the first embodiment will be described.
According to the first embodiment, a first arc is generated between the first fixed contact 13a and the first movable contact 15a in the opening start state, and the second arc is generated between the second fixed contact 14a and the second movable contact 15b. An arc is generated.
The first arc extended to the first arc extinguishing space 42 by the action of the Lorentz force F1 due to the relationship between the magnetic flux φ1 outside the first arc extinguishing permanent magnet 40 and the current flow of the first arc is: Lorentz force due to the relationship between the magnetic flux φ2 inside the first arc extinguishing permanent magnet 40 generated near the communication position of the first arc extinguishing space 42 and the first arc extension space 46 and the current flow of the first arc. Receive F2. The Lorentz force F2 is a force directed to the first arc extension space 46, and the first arc enters the first arc extension space 46 and is further extended.

  In addition, the second arc extended to the second arc extinguishing space 43 by the action of the Lorentz force F3 due to the relationship between the magnetic flux φ1 outside the first arc extinguishing permanent magnet 40 and the current flow of the second arc. Is based on the relationship between the magnetic flux φ2 inside the first arc extinguishing permanent magnet 40 generated near the communication position of the second arc extinguishing space 43 and the first arc extension space 46 and the current flow of the second arc. Receives Lorentz force F4. The Lorentz force F4 is a force toward the first arc extension space 46, and the second arc enters the first arc extension space 46 and is further extended.

  Thereby, in this 1st Embodiment, the 1st arc generated between the 1st fixed contact 13a and the 1st movable contact 15a at the time of interruption of a large electric current is the 1st arc extinguishing space 42 and the 1st arc extension space 46 Since the second arc generated between the second fixed contact 14a and the second movable contact 15b is sufficiently stretched in the second arc extinguishing space 43 and the first arc extension space 46, The arc extinguishing function can be exhibited reliably.

Further, the first arc extension space 46 and the second arc extension space 47 are provided in the longitudinal direction of the movable contact 15 along the side walls 18a and 18b of the insulating cylinder portion 18, thereby sufficiently extending the arc. However, it is not necessary to provide a large arc extinguishing space, and the electromagnetic contactor 1 with a reduced size can be provided.
Further, when an arc is generated, the magnetic contactor 1 melts the fixed contact and the movable contact as the temperature of the first fixed contact 13a, the first movable contact 15a, the second fixed contact 14a, and the second movable contact 15b rises. Metal vapor is generated. At this time, in the first embodiment, the generated metal vapor is dispersed in the first arc extension space 46 and the second arc extension space 47, so that in the first arc extinguishing space 42 and the second arc extinguishing space 43. The charging is suppressed, the arc extinguishing performance of the first arc and the second arc is prevented from being lowered, and the first fixed contact 13a and the first movable contact 15a, the second fixed contact 14a and the second movable contact 15b It is possible to prevent the insulation performance between the electrodes from deteriorating due to deterioration. Thereby, the lifetime performance by shortening of arc generation time can be improved.

  Here, when the negative electrode (−) terminal is connected to the first fixed contact 13 of the electromagnetic contactor 1 of the first embodiment and the positive electrode (+) terminal is connected to the second fixed contact 14, in the opening start state. The first arc between the first fixed contact 13a and the first movable contact 15a is extended to the third arc extinguishing space 44 side, and the second arc between the second fixed contact 14a and the second movable contact 15b is It is extended to the fourth arc extinguishing space 45 side.

The first arc is generated by the magnetic flux φ2 inside the second arc extinguishing permanent magnet 41 generated near the communication position of the third arc extinguishing space 44 and the second arc extension space 47 and the current of the first arc. Under the Lorentz force due to the relationship with the flow, it enters the second arc extension space 47 and is further extended.
Further, the second arc is generated by the magnetic flux φ2 inside the second arc extinguishing permanent magnet 41 generated near the communication position of the fourth arc extinguishing space 45 and the second arc extension space 47 and the current of the second arc. Under the Lorentz force due to the relationship with the flow, it enters the second arc extension space 47 and is further extended.

  As a result, when a large current is interrupted, the first arc generated between the first fixed contact 13a and the first movable contact 15a is sufficiently stretched in the third arc extinguishing space 44 and the second arc extension space 47. Since the second arc generated between the second fixed contact 14a and the second movable contact 15b is sufficiently stretched in the fourth arc extinguishing space 45 and the second arc extension space 47, the arc extinguishing can be achieved while reducing the size. The arc function can be exhibited reliably, and the arc generation time can be shortened by suppressing the filling of the metal vapor.

[Second Embodiment]
Next, FIG. 5 shows the contact mechanism 80 which comprises the electromagnetic contactor 1 of 2nd Embodiment which concerns on this invention by planar view. In addition, the same code | symbol is attached | subjected to the same component as the contact mechanism 2 of 1st Embodiment shown in FIG. 2, and the description is abbreviate | omitted.
The first arc extinguishing permanent magnet 40 constituting the contact mechanism 80 of the second embodiment is composed of two permanent magnets 81 and 82 having a center position in the longitudinal direction of the movable contact 15 as a divided position. The two-arc extinguishing permanent magnet 41 is composed of two permanent magnets 83 and 84 having the center position in the longitudinal direction of the movable contact 15 as a divided position.

  The two permanent magnets 81 and 82 constituting the first arc extinguishing permanent magnet 40 also have N magnetic pole faces facing the movable contact 15, and the two permanent magnets 83 constituting the second arc extinguishing permanent magnet 41. , 84 are fixed to the inner wall of the metal magnet support 60 with the magnetic pole face facing the movable contact 15 as the N pole.

  According to the electromagnetic contactor 1 of the second embodiment, a first arc is generated between the first fixed contact 13a and the first movable contact 15a in the opening start state, and the second fixed contact 14a and the second movable contact 15b. When the second arc is generated during the period, the Lorentz force F1 due to the relationship between the magnetic flux φ1 outside the permanent magnets 81 and 82 constituting the first arc extinguishing permanent magnet 40 and the current flow of the first arc is generated. The first arc extended to the first arc extinguishing space 42 is generated by the first arc extinguishing permanent magnet 40 generated in the vicinity of the communication position of the first arc extinguishing space 42 and the first arc extending space 46. It receives the Lorentz force F2 due to the relationship between the inner magnetic flux φ2 and the current flow of the first arc. The Lorentz force F2 is a force directed to the first arc extension space 46, and the first arc enters the first arc extension space 46 and is further extended.

  In addition, the second arc extended to the second arc extinguishing space 43 by the action of the Lorentz force F3 due to the relationship between the magnetic flux φ1 outside the permanent magnets 81 and 82 and the current flow of the second arc is the second arc. A Lorentz force F4 due to the relationship between the magnetic flux φ2 inside the first arc extinguishing permanent magnet 40 generated near the communication position of the arc extinguishing space 43 and the first arc extension space 46 and the current flow of the second arc is obtained. receive. The Lorentz force F4 is a force toward the first arc extension space 46, and the second arc enters the first arc extension space 46 and is further extended.

  As described above, also in the second embodiment, the first arc generated between the first fixed contact 13a and the first movable contact 15a when the large current is interrupted is the first arc extinguishing space 42 and the first arc extension space. The second arc generated between the second fixed contact 14a and the second movable contact 15b is sufficiently extended in the second arc extinguishing space 43 and the first arc extension space 46. The arc extinguishing function can be exhibited reliably.

  In addition, when a negative electrode (−) terminal is connected to the first fixed contact 13 of the electromagnetic contactor 1 of the second embodiment and a positive electrode (+) terminal is connected to the second fixed contact 14, The first arc between the first fixed contact 13a and the first movable contact 15a is extended to the third arc extinguishing space 44 side, and the second arc between the second fixed contact 14a and the second movable contact 15b is the second arc. 4 arc extinguishing space 45 side is extended, the 1st arc makes the 2nd arc extinguishing permanent magnet 41 generated near the communicating position of the 3rd arc extinguishing space 44 and the 2nd arc extension space 47 The Lorentz force due to the relationship between the magnetic flux φ2 inside the two permanent magnets 83 and 84 and the current flow of the first arc is received, and enters the second arc extension space 47 and is further extended.

The second arc is a relationship between the magnetic flux φ2 inside the permanent magnets 83 and 84 generated near the communication position of the fourth arc extinguishing space 45 and the second arc extension space 47 and the current flow of the second arc. In response to the Lorentz force, the air enters the second arc extension space 47 and is further extended.
As a result, when a large current is interrupted, the first arc generated between the first fixed contact 13a and the first movable contact 15a is sufficiently stretched in the third arc extinguishing space 44 and the second arc extension space 47. Since the second arc generated between the second fixed contact 14a and the second movable contact 15b is sufficiently stretched in the fourth arc extinguishing space 45 and the second arc extension space 47, the arc extinguishing can be achieved while reducing the size. The arc function can be exhibited reliably, and the arc generation time can be shortened by suppressing the filling of the metal vapor.

[Third Embodiment]
Next, FIG. 6 shows the contact mechanism 90 which comprises the electromagnetic contactor 1 of 3rd Embodiment which concerns on this invention by planar view. In the third embodiment, the same components as those of the electromagnetic contactor 1 of the first embodiment shown in FIGS.
In the third embodiment, the first and second arc extinguishing permanent magnets 40 and 41 having the opposite magnetic pole faces as S poles are arranged inside the rectangular cylinder 5 constituting the contact housing case 4. Yes.
A first magnet housing portion 91 having a rectangular space whose longitudinal direction extends along one side surface 15 c in the width direction of the movable contact 15 is formed at the bottom of the insulating cylinder portion 18. A second magnet storage portion 92 having a rectangular space extending in the longitudinal direction is formed on the other side surface 15c in the width direction, and the first arc extinguishing permanent magnet is formed in the space of the first magnet storage portion 91. 40 is housed, and the second arc extinguishing permanent magnet 41 is housed in the space of the second magnet housing portion 92.

The first and second arc extinguishing permanent magnets 40 and 41 are magnetized so that the magnetic pole faces facing the movable contact 15 are N poles.
Also. First to fourth arc extinguishing spaces 93 to 96 are provided at positions facing from the both ends in the longitudinal direction of the movable contact 15 inside the insulating cylinder portion 18 in the width direction of the movable contact 15.
Further, between the wall of the first magnet housing portion 91 and the side wall 18 a of the insulating cylinder portion 18, it extends in the longitudinal direction of the movable contact 15 and communicates with the first and second arc extinguishing spaces 93 and 94. A first arc extension space 97 is formed, and extends in the longitudinal direction of the movable contact 15 between the wall of the second magnet housing portion 92 and the side wall 18b of the insulating cylinder portion 18 to extend the third and fourth arcs. A second arc extension space 98 communicating with the arc spaces 95 and 96 is formed.

The magnetic flux φ1 outside the first arc extinguishing permanent magnet 40 passes through the vicinity of the opposed portion of the first fixed contact 13a and the first movable contact 15a and has a large magnetic flux density toward the left side in the left-right direction. In addition to crossing, it passes near the opposing portion of the second fixed contact 14a and the second movable contact 15b and crosses with a large magnetic flux density toward the right side in the left-right direction.
Further, the magnetic flux φ2 inside the both end portions 40a and 40b of the first arc extinguishing permanent magnet 40 is from the N pole magnetic pole surface in the vicinity of the communication position of the first arc extinguishing space 93 and the first arc extension space 97. It occurs around the magnetic pole surface of the S pole on the back surface, and from the magnetic pole surface of the N pole to the magnetic pole surface of the S pole on the back surface in the vicinity of the communication position of the second arc extinguishing space 94 and the first arc extension space 97. Occur.

Further, the magnetic flux φ1 outside the second arc extinguishing permanent magnet 41 passes near the opposing portion of the first fixed contact 13a and the first movable contact 15a and has a large magnetic flux density toward the left side in the left-right direction. In addition to crossing, it passes near the opposing portion of the second fixed contact 14a and the second movable contact 15b and crosses with a large magnetic flux density toward the right side in the left-right direction.
Further, the magnetic flux φ2 inside the both end portions 41a and 41b of the second arc extinguishing permanent magnet 41 is from the N pole magnetic pole surface in the vicinity of the communication position of the third arc extinguishing space 95 and the second arc extension space 98. This occurs around the magnetic pole surface of the S pole on the back surface, and rotates from the magnetic pole surface of the N pole to the magnetic pole surface of the S pole on the back surface in the vicinity of the communication position of the fourth arc extinguishing space 96 and the second arc extension space 47. Occur.

Next, operation | movement of the electromagnetic contactor 1 of 3rd Embodiment is demonstrated.
In the electromagnetic contactor 1 of the third embodiment, a positive (+) terminal is connected to the first fixed contact 13 and a negative (−) terminal is connected to the second fixed contact 14.
The electromagnetic contactor 1 according to the third embodiment is in a closed state in which a large current of the power supply source is supplied to the load device through the first fixed contact 13, the movable contact 15, and the second fixed contact 14. Then, the excitation to the exciting coil 34 of the electromagnet unit 20 is stopped.

When the excitation to 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 is lost, 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.

In such a contact opening start state, a first arc (not shown) 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, and the movable contact is generated. A second arc (not shown) is generated between the second movable contact 15b of the child 15 and the second fixed contact 14a of the second fixed contact 14, and the current conduction state is continued by these arcs. Become.
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. 6, the magnetic flux φ1 outside the first arc extinguishing permanent magnet 40 and The magnetic flux φ1 outside the second arc extinguishing permanent magnet 41 is generated toward the outside of one side surface 15c in the longitudinal direction of the movable contact 15 through the vicinity of the first arc.

Accordingly, the Lorentz on the side toward the first arc extinguishing space 93 on the side surface 15c side in the width direction of the movable contact 15 is determined by the Fleming left-hand rule from the relationship between the current flow of the first arc and the outer magnetic flux φ1. A force F5 is generated.
By this Lorentz force F5, the first arc generated between the first fixed contact 13 a and the first movable contact 15 a is extended toward the first arc extinguishing space 93.

  The first arc stretched toward the first arc extinguishing space 93 causes the magnetic flux φ2 inside the first arc extinguishing permanent magnet 40 to be generated in the first arc extinguishing space 93 and the first arc extension space 97. Since it is generated from the N pole pole surface to the back S pole pole surface in the vicinity of the communication position, Fleming's left-hand rule is derived from the relationship between the current flow of the first arc and the inner magnetic flux φ2. A Lorentz force F6 is generated on the side facing the first arc extension space 97 in a direction different from the Lorentz force F5. Then, the first arc extended to the first arc extinguishing space 93 by this Lorentz force F6 enters the first arc extension space 97 and is further extended.

Further, between the second fixed contact 14a of the second fixed contact 14 and the second movable contact 15b of the movable contact 15, the magnetic flux φ1 outside the first arc extinguishing permanent magnet 40 and the second arc extinguishing. A magnetic flux φ1 outside the arc permanent magnet 41 is generated toward the outside of one side surface 15c in the longitudinal direction of the movable contact 15 through the vicinity of the second arc.
As a result, from the relationship between the current flow of the second arc and the outer magnetic flux φ1, the side facing the second arc extinguishing space 94 on the side surface 15c side in the width direction of the movable contact 15 is greatly increased according to the Fleming left-hand rule. Lorentz force F7 is generated.

Due to the Lorentz force F7, the second arc generated between the second fixed contact 14a and the second movable contact 15b is extended toward the second arc extinguishing space 94.
Then, the second arc stretched toward the second arc extinguishing space 94 is such that the magnetic flux φ2 inside the first arc extinguishing permanent magnet 40 is in the second arc extinguishing space 94 and the first arc extension space 97. Since it is generated in the vicinity of the communication position from the N pole face to the S pole face on the back side, the Fleming's left-hand rule is derived from the relationship between the current flow of the second arc and the inner magnetic flux φ2. A Lorentz force F8 is generated on the side facing the first arc extension space 97 in a direction different from the Lorentz force F7. The second arc extended to the second arc extinguishing space 94 by this Lorentz force F8 enters the first arc extension space 97 and is further extended.

  Here, the insulating case of the present invention corresponds to the insulating substrate 6 and the insulating cylinder portion 18, 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 contacts of the present invention includes Corresponding to the first movable contact 15a and the second movable contact 15b, the arc extinguishing space of the present invention corresponds to the first to fourth arc extinguishing spaces 93 to 96, and the first magnetic flux of the present invention is the outer magnetic flux. corresponding to φ1, the first Lorentz force of the present invention corresponds to Lorentz forces F5, F7, the second Lorentz force of the present invention corresponds to Lorentz forces F6, F8, and the second magnetic flux of the present invention is the inner magnetic flux φ2. The arc extension space of the present invention corresponds to the first arc extension space 97 and the second arc extension space 98.

Next, the function and effect of the third embodiment will be described.
According to the third embodiment, the first arc is generated between the first fixed contact 13a and the first movable contact 15a in the opening start state, and the second arc is generated between the second fixed contact 14a and the second movable contact 15b. An arc is generated.
The first arc extended to the first arc extinguishing space 93 by the action of the Lorentz force F5 due to the relationship between the magnetic flux φ1 outside the first arc extinguishing permanent magnet 40 and the current flow of the first arc is: Lorentz force due to the relationship between the magnetic flux φ2 inside the first arc extinguishing permanent magnet 40 generated near the communication position of the first arc extinguishing space 93 and the first arc extension space 97 and the current flow of the first arc. Receive F6. The Lorentz force F6 is a force toward the first arc extension space 97, and the first arc enters the first arc extension space 97 and is further extended.

  Further, the second arc extended to the second arc extinguishing space 94 by the action of the Lorentz force F3 due to the relationship between the magnetic flux φ1 outside the first arc extinguishing permanent magnet 40 and the current flow of the second arc. Is based on the relationship between the magnetic flux φ2 inside the first arc extinguishing permanent magnet 40 generated near the communication position of the second arc extinguishing space 94 and the first arc extension space 97 and the current flow of the second arc. Receives Lorentz force F8. The Lorentz force F8 is a force directed to the first arc extension space 97, and the second arc enters the first arc extension space 97 and is further extended.

  Thereby, in this 3rd Embodiment, the 1st arc generated between the 1st fixed contact 13a and the 1st movable contact 15a at the time of interruption of a large electric current is the 1st arc extinguishing space 93 and the 1st arc extension space 97. Since the second arc generated between the second fixed contact 14a and the second movable contact 15b is sufficiently extended in the second arc extinguishing space 94 and the first arc extension space 97, The arc extinguishing function can be exhibited reliably.

Further, the first arc extension space 97 and the second arc extension space 98 are provided in the longitudinal direction of the movable contact 15 along the side walls 18a and 18b of the insulating cylinder portion 18, thereby sufficiently extending the arc. However, it is not necessary to provide a large arc extinguishing space, and the electromagnetic contactor 1 with a reduced size can be provided.
In the third embodiment, the first and second arc extinguishing permanent magnets 40 and 41 are housed in the first magnet housing portion 91 and the second magnet housing portion 92 provided at the bottom of the insulating cylinder portion 18. Therefore, the contact mechanism 90 can be downsized.

And in this 3rd Embodiment, the magnet support body 60 as shown in FIG. 2 of 1st Embodiment becomes unnecessary, and the electromagnetic contactor cover 50 with a small external dimension is arrange | positioned on the outer periphery of the square cylinder 5. FIG. Therefore, size reduction of the electromagnetic contactor 1 can be achieved.
In the third embodiment, when the arc is generated, the temperature of the first fixed contact 13a, the first movable contact 15a, the second fixed contact 14a, and the second movable contact 15b is increased, so that the fixed contact and the movable contact are melted. However, the generated metal vapor is dispersed in the first arc extension space 97 and the second arc extension space 98, so that the first arc extinguishing space 93 and the second arc extinguishing space 94 are filled. Between the first fixed contact 13a and the first movable contact 15a, the second fixed contact 14a and the second movable contact 15b, and the arc extinguishing performance of the first arc and the second arc is prevented from deteriorating. It is possible to prevent the insulation performance of the metal from deteriorating due to deterioration. Thereby, the lifetime performance by shortening of arc generation time can be improved.

  Here, when a negative electrode (−) terminal is connected to the first fixed contact 13 of the electromagnetic contactor 1 of the third embodiment and a positive electrode (+) terminal is connected to the second fixed contact 14, The first arc between the first fixed contact 13a and the first movable contact 15a is extended toward the third arc extinguishing space 95, and the second arc between the second fixed contact 14a and the second movable contact 15b is It is extended toward the fourth arc extinguishing space 96 side.

The first arc is generated by the magnetic flux φ2 inside the second arc extinguishing permanent magnet 41 generated near the communication position of the third arc extinguishing space 95 and the second arc extension space 98 and the current of the first arc. Under the Lorentz force due to the relationship with the flow, it enters the second arc extension space 98 and is further extended.
In addition, the second arc is a magnetic flux φ2 inside the second arc extinguishing permanent magnet 41 generated near the communication position of the fourth arc extinguishing space 96 and the second arc extension space 98 and the current of the second arc. Under the Lorentz force due to the relationship with the flow, it enters the second arc extension space 98 and is further extended.

  Thus, when a large current is interrupted, the first arc generated between the first fixed contact 13a and the first movable contact 15a is sufficiently stretched in the third arc extinguishing space 95 and the second arc extension space 98. Since the second arc generated between the second fixed contact 14a and the second movable contact 15b is sufficiently stretched in the fourth arc extinguishing space 96 and the second arc extension space 98, the arc extinguishing can be achieved while reducing the size. The arc function can be exhibited reliably, and the arc generation time can be shortened by suppressing the filling of the metal vapor.

DESCRIPTION OF SYMBOLS 1 Electromagnetic contactor 2,80,90 Contact mechanism 4 Contact storage case 5 Square cylinder 6 Insulating board 7 Flange part 9,10 Through-hole 11,12 Conductor part 13 1st fixed contact 13a 1st fixed contact 13b 1st electroconductivity Plate portion 13c Second conductive plate portion 13d Third conductive plate portion 14 Second fixed contact 14a Second fixed contact 14b First conductive plate portion 14c Second conductive plate portion 14d Third conductive plate portion 15 Movable contact 15a First Movable contact 15b Second movable contact 15c One side surface 15d in the width direction of the movable contactor The other side surface 16 and 17 in the width direction of the movable contactor Insulating cover 18 Insulating cylinder portions 18a and 18b Sidewalls 19a and 19b Magnetic body plate 20 Electromagnet Unit 21 Upper magnetic yoke 21a Through hole 22 Movable plunger 22a Circular flange portion 23 Connecting shaft 24 Through hole 25 Flange portion 26 Contact spring 27 Spring receiver 27a C 28 Magnetic yoke 29 Fixed plunger 30 Spool 31 Central cylindrical portion 32 Lower flange portion 33 Upper flange portion 34 Excitation coil 35 Cap 36 Return spring 37 Driving permanent magnet 38 Through hole 39 Auxiliary yoke 40 First arc extinguishing permanent magnet 40a , 40b First arc extinguishing permanent magnet end 41 Second arc extinguishing permanent magnet 41a, 41b Second arc extinguishing permanent magnet end 42, 93 First arc extinguishing space 43, 94 Second Arc extinguishing space 44, 95 Third arc extinguishing space 45, 96 Fourth arc extinguishing space 46, 97 First arc extension space 47, 98 Second arc extension space 50 Electromagnetic contactor cover 60 Magnet support 61 First Inner wall 62 Second inner walls 81, 82 Permanent magnets 83, 84 constituting the first arc extinguishing permanent magnet Constructing the second arc extinguishing permanent magnet Histomagnet 90 Eighth inner wall 91 Third arc extinguishing space 92 Fourth arc extinguishing space 93 Fifth arc extinguishing space 94 Sixth arc extinguishing space 95 Gas inflow spaces F1, F2, F3, F4, F5, F6 F7, F8 Lorentz force

Claims (5)

A pair of fixed contacts having fixed contacts;
A movable contact provided with a pair of movable contacts at both ends in the longitudinal direction capable of coming into contact with and separating from the fixed contacts of the pair of fixed contacts;
An insulating case formed of an insulator housing the pair of fixed contacts and the movable contact;
A pair of arc extinguishing permanent magnets disposed along both sides in the width direction of the movable contact and having opposite magnetic pole faces facing each other with the same polarity;
Arc extinguishing space provided at a position facing outward in the width direction from both longitudinal ends of the movable contact in the insulating case, and
In the pair of arc extinguishing permanent magnets, the arc extinguishing is performed with respect to the arc generated between the fixed contact and the movable contact by the first magnetic flux generated outward in the longitudinal direction of the movable contact. While acting the first Lorentz force toward the arc space,
A second magnetic flux that wraps between the opposing magnetic pole surface and the magnetic pole surface on the back side of the opposing magnetic pole surface at the ends of the pair of arc extinguishing permanent magnets is generated in the vicinity of the arc extinguishing space, and the arc extinguishing is performed. Acting a second Lorentz force in a direction different from the direction in which the first Lorentz force was applied to the arc moved into space ;
The pair of arc extinguishing permanent magnets is disposed inside the insulating case along both sides in the width direction of the movable contact .   The electromagnetic contactor according to claim 1, wherein an arc extension space into which the arc moved by the action of the second Lorentz force enters is provided at a position communicating with the arc extinguishing space in the insulating case.   The electromagnetic contactor according to claim 2, wherein the arc extension space is provided in a longitudinal direction of the movable contact along an inner wall of the insulating case. The electromagnetic contactor according to any one of claims 1 to 3 , wherein the arc extension space is disposed between the pair of arc extinguishing permanent magnets and an inner wall of the insulating case. It said pair of arc extinguishing permanent magnets, an electromagnetic contactor according to any one of claims 1 to 4, characterized in that it is bisected in the longitudinal direction of the movable contact.

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