JP6375745B2 - 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, when the temperature of a pair of fixed contact and movable contact rises due to generation of an arc, each fixed contact and movable contact may melt and a large amount of metal vapor may be generated.
In the device of Patent Document 1, there is a possibility that the metal vapor fills the vicinity where the arc generated between the pair of fixed contact and the movable contact is generated. Therefore, the arc extinguishing performance may be reduced, or the insulating performance between the pair of fixed contact and movable contact may be deteriorated to cause a re-arcing.

  Therefore, the present invention uses a contact mechanism that can prevent arc-extinguishing performance and re-arcing even when the temperature of a pair of fixed contact and movable contact rises and metal vapor is generated, and this is used. The purpose is to provide an electromagnetic contactor.

In order to achieve the above object, a contact mechanism 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, an insulating case formed of an insulating material that houses the pair of fixed contacts and the movable contact, and a periphery of the insulating case, between the pair of fixed contacts and the pair of movable contacts An arc extinguishing permanent magnet for extending the generated arc, an arc extinguishing space provided in a direction in which the arc in the insulating case is stretched, and a gas inflow space formed in a separate chamber from the arc extinguishing space in the insulating case A gas passage that communicates between the arc extinguishing space and the gas inflow space, and a movable contact is disposed in the insulating case with a pair of movable contacts at both ends in the longitudinal direction, and a pair of fixed Contact A child is arranged at both ends in the longitudinal direction of the movable contact, and includes a first inner wall that rises along one side in the width direction of the movable contact, and an inner surface of the insulating case that faces the first inner wall. A second space is formed by a second inner wall that forms a first space and rises along the other side in the width direction of the movable contact, and an inner surface of the insulating case that faces the second inner wall, and a pair of fixed contacts A gas passage communicating between the first space and the second space is formed in the child, one of the first space and the second space is an arc extinguishing space, and the other of the first space and the second space is inflow of gas It is a space.
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 electromagnetic contactor using the contact mechanism according to the present invention, even if the temperature of the pair of fixed contacts and the movable contact rises and the metal vapor is generated in the arc extinguishing space, the metal vapor is a gas. Since the gas passes through the passage and flows into the gas inflow space, the metal vapor is not filled in the arc extinguishing space, and the arc extinguishing performance and the re-arcing of the arc can be prevented.

It is sectional drawing which shows the electromagnetic contactor of 1st Embodiment of this invention. It is sectional drawing which showed the contact mechanism of the electromagnetic contactor of 1st Embodiment by planar view. It is the figure which showed the opening start state of the contact mechanism of the electromagnetic contactor of 1st Embodiment. It is the IV-IV line arrow directional view of FIG. It is sectional drawing which showed the contact mechanism of the electromagnetic contactor of 2nd Embodiment of this invention by planar view. It is the figure which showed the opening start state of the contact mechanism of the electromagnetic contactor of 2nd Embodiment.

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. 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 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 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 5 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 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 having the second fixed contact 14a provided on the upper surface and the second conductive portion bent upward from the end of the first conductive plate portion 14b away from the movable contact 15 and extending upward. A plate portion 14c 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 are provided.

  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 plate 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 14 of the second constant contact 14 19a and 19b are attached. Thereby, the magnetic field generated by the current flowing through the first conductive plate portions 13b and 14b can be shielded.
The movable contact 15 is in a released state, and 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 at a predetermined interval. Become.

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. .
FIG. 2 shows the contact mechanism 2 in a plan view, and first to fourth arc extinguishing permanent magnets 40 to 43 are arranged on the outer periphery of the rectangular tube 5.

A rectangular magnet support 60 made of metal is disposed outside the rectangular tube 5 so as to cover the entire outer periphery. The magnet support 60 is a holding member (not shown) provided in the electromagnetic contactor 1. ).
The first arc extinguishing permanent magnet 40 is fixed to the magnet support 60 so as to face the one side surface 15c in the width direction of the movable contact 15 with the square cylinder 5 and the insulating cylinder part 18 interposed therebetween. The arc extinguishing permanent magnet 41 is fixed to the magnet support 60 so as to face the other side surface 15 c in the width direction of the movable contact 15 via the square cylinder 5 and the insulating cylinder 18.

The first and second arc extinguishing side permanent magnets 41 and 42 are magnetized so that the magnetic pole surface facing the rectangular tube 5 is an N pole.
Further, the third arc extinguishing permanent magnet 42 is fixed to the magnet support 60 so as to face the one side surface 15e in the longitudinal direction of the movable contact 15 via the square tube 5 and the insulating tube portion 18, The fourth arc extinguishing permanent magnet 43 is fixed to the magnet support 60 so as to face the other side surface 15 f in the longitudinal direction of the movable contact 15 via the square tube 5 and the insulating tube portion 18.

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.
As a result, the magnetic flux φ1 flowing out of the N pole of the first arc extinguishing permanent magnet 40 and flowing into the S pole of the third arc extinguishing permanent magnet 42 and the N pole of the second arc extinguishing permanent magnet 41 are extracted. Thus, the magnetic flux φ1 flowing in the S pole of the third arc extinguishing permanent magnet 42 is close to the facing portion between the first fixed contact 13a of the first fixed contact 13 and the first movable contact 15a of the movable contact 15. It passes and crosses with a large magnetic flux density toward the left side in the left-right direction.

  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.

As shown in FIG. 2, a first inner wall 61 is provided between the first fixed contact 13 and the second fixed contact 14 along one side surface 15 c in the width direction of the movable contact 15 at the bottom of the insulating cylinder portion 18. A second inner wall 62 is formed between the first fixed contact 13 and the second fixed contact 14 along the other side surface 15 d in the width direction of the movable contact 15.
As a result, a first arc extinguishing space 45 is formed between the first inner wall 61 and the side wall 18a of the insulating cylinder part 18, and the second arc extinguishing space is formed between the second inner wall 62 and the side wall 18b of the insulating cylinder part 18. An arc space 46 is formed.

A vent hole 63 penetrating in the width direction is formed in the second conductive plate portion 13 c of the first fixed contact 13, and a vent hole 64 penetrating in the width direction in the second conductive plate portion 14 c of the second fixed contact 1. Is formed.
A pair of ventilation holes 65 and 66 are formed at the edges in the width direction of the insulating cover 16 and the magnetic plate 19a that overlap each other on the first fixed contact 13 side. One vent hole 65 opens toward one opening portion of the vent hole 63 of the second conductive plate portion 13 c and communicates with the first arc extinguishing space 45. The other vent hole 66 opens toward the other opening of the vent hole 63 of the second conductive plate portion 13 c and communicates with the second arc extinguishing space 46.

  In addition, a pair of ventilation holes 67 and 68 are formed at the edges in the width direction of the insulating cover 16 and the magnetic plate 19b that overlap each other on the second fixed contact 14 side. The one air hole 67 opens toward one opening of the air hole 64 of the second conductive plate portion 14 c and communicates with the first arc extinguishing space 45. The other vent hole 68 opens toward the other opening of the vent hole 64 of the second conductive plate portion 14 c and communicates with the second arc extinguishing space 46.

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 gas inflow space of the present invention corresponds to the second arc extinguishing space 46, and the covering member of the present invention is the insulating covers 16, 17 and the magnetic plates 19a, Corresponding to 19b, the covering member passage of the present invention corresponds to the vent holes 65, 66, 67, 68, the movable iron core of the present invention corresponds to the movable plunger 22, and the operating electromagnet of the present invention corresponds to the electromagnet unit 20. doing.
Next, operation | movement of the electromagnetic contactor 1 of 1st Embodiment is demonstrated with reference to FIG.1, FIG3 and FIG.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.
Now, 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 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.

  In such a contact opening start state, as shown in FIG. 3, 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 first 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.

As shown in FIG. 3, 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 magnet 41. The magnetic flux φ1 that exits from the N pole and flows to the S pole of the third arc extinguishing permanent magnet 42 passes near the first arc and faces outward of one side surface 15e in the longitudinal direction of the movable contact 15. Occur.
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 through 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 movable contact 15 through the vicinity of the second arc.

  Between the first fixed contact 13a of the first fixed contact 13 and the first movable contact 15a of the movable contact 15, a first arc extends from the first fixed contact 13a side to the first movable contact 15a side, The magnetic flux φ1 generated by the one-arc arc-extinguishing permanent magnet 40, the second arc-extinguishing permanent magnet 41, and the third arc-extinguishing permanent magnet 42 is outside the one side surface 15e in the longitudinal direction of the movable contact 15. It occurs in the direction. Accordingly, a large Lorentz force on the side facing the first arc extinguishing space 45 on the side surface 15c side in the width direction of the movable contact 15 according to the Fleming left-hand rule from the relationship between the current flow of the first arc and the magnetic flux φ1. F1 occurs (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 45.
Further, the second arc extends from the second movable contact 15b side to the second fixed contact 14a side 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 generated by the first arc extinguishing permanent magnet 40, the second arc extinguishing permanent magnet 41, and the fourth arc extinguishing permanent magnet 43 is outside the other side surface 15f of the movable contact 15 in the longitudinal direction. It occurs toward the direction. Accordingly, a large Lorentz force on the side facing the first arc extinguishing space 45 on the side surface 15c side in the width direction of the movable contact 15 according to the Fleming left-hand rule from the relationship between the current flow of the second arc and the magnetic flux φ1. F2 is generated.

By this Lorentz force F2, the second arc generated between the second fixed contact 14a and the second movable contact 15b is stretched toward the first arc extinguishing space 45.
Here, the first fixed contact 13a, the second fixed contact 14a and the first movable contact 15a of the movable contact 15 and the second fixed contact 14 of the first and second fixed contacts 13, 14 are generated by the generation of the first arc and the second arc. When the temperature rises due to the arc of the movable contact 15b, the first fixed contact 13a, the second fixed contact 14a, the first movable contact 15a, and the second movable contact 15b are melted and a large amount of metal vapor is generated in the first arc extinguishing space 45. Will occur.

After the metal vapor generated in the vicinity of the first arc collides with the side wall 18a of the insulating cylinder portion 18, the flow toward the second conductive plate portion 13c of the first contactor 13 and the flow toward the second contactor 14 Become.
Further, the metal vapor generated in the vicinity of the second arc collides with the side wall 18a of the insulating cylinder portion 18, and then flows toward the second conductive plate portion 14c of the second contactor 14 and toward the first contactor 13. It becomes a flow.

  The first fixed contact 13, the insulating cover 16, and the magnetic material plate 19 a are formed with communication holes 63, 65, 66 that communicate with the arc extinguishing space 45 and the arc extinguishing space 46, and the second fixed contact 14. In addition, since the insulating cover 16 and the magnetic plate 19b are also formed with communication holes 64, 67, 68 that communicate with the first arc extinguishing space 45 and the second arc extinguishing space 46, the first contact 13 The flow of the metal vapor toward the second conductive plate portion 13c and the flow of the metal vapor toward the second conductive plate portion 14c of the second contactor 14 pass through the communication holes 63, 65, 66 and the communication holes 64, 67, 68. Then flows toward the second arc extinguishing space 46.

  Therefore, 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 between the second fixed contact 14a and the second movable contact 15ba. A second arc is generated, and the temperatures of the first fixed contact 13a, the second fixed contact 14a, and the first movable contact 15a and the second movable contact 15b of the movable contact 15 rise, and the first fixed contact 13a and the second fixed contact are raised. A large amount of metal vapor is generated in the first arc extinguishing space 45 while the contact 14 a, the first movable contact 15 a and the second movable contact 15 b are melted, and collides with the side wall 18 a of the insulating cylinder portion 18. In the first embodiment, the metal vapor in the first arc extinguishing space 45 is connected to the communication holes 63, 65, 66 formed in the first fixed contact 13, the insulating cover 16, and the magnetic plate 19a, and the second fixed contact. The metal vapor flows to the second arc extinguishing space 46 side from the communication holes 64, 67, 68 formed in the element 14, the insulating cover 16 and the magnetic plate 19b, and the generated metal vapor is dispersed in the second arc extinguishing space 46. This prevents the first arc extinguishing space 45 from being filled. Accordingly, the arc extinguishing performance of the first arc and the second arc is prevented from being lowered, and the first movable contact 15a and the second movable contact of the first fixed contact 13a, the second fixed contact 14a, and the movable contact 15 are prevented. It is possible to prevent the insulation performance between 15b from deteriorating due to deterioration.

  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. Since the first arc between the first fixed contact 13 a and the first movable contact 15 a and the second arc between the second fixed contact 14 a and the second movable contact 15 ba are generated toward the second arc extinguishing space 46. The metal vapor generated in the second arc extinguishing space 46 is communicated with the first fixed contact 13, the insulating cover 16, the communication holes 63, 65, and 66 formed in the magnetic plate 19 a, the second fixed contact 14, and the insulation. By flowing to the first arc extinguishing space 45 side from the communication holes 64, 67, 68 formed in the cover 16 and the magnetic plate 19b, the generated metal vapor is dispersed in the first arc extinguishing space 45, thereby To fill the two arc extinguishing space 46 Control to. Accordingly, the arc extinguishing performance of the first arc and the second arc is prevented from being lowered, and the first movable contact 15a and the second movable contact of the first fixed contact 13a, the second fixed contact 14a, and the movable contact 15 are prevented. It is possible to prevent the insulation performance between 15b from deteriorating due to deterioration.

[Second Embodiment]
Next, FIG.5 and FIG.6 shows the contact mechanism 80 of 2nd Embodiment which concerns on this invention by planar view.
A third inner wall 81 is formed on the bottom of the insulating cylinder portion 18 of the second embodiment so that the space on the side surface 15c side in the width direction of the movable contact 15 is divided into two in the longitudinal direction. A fourth inner wall 82 is formed so that the space on the other side surface 15d side of the width direction 15 is divided into two in the longitudinal direction.

In addition, a gap 83 is provided between the third inner wall 81 and a fifth inner wall 84 is formed on the first fixed contact 13 side along one side surface 15 c of the movable contact 15 in the width direction. A sixth inner wall 86 is formed on the second fixed contact 14 side along one side surface 15c in the width direction of the movable contact 15 by providing a gap 85 therebetween.
In addition, a gap 87 is provided between the fourth inner wall 82 and a seventh inner wall 88 is formed on the first fixed contact 13 side along the other side surface 15 d in the width direction of the movable contact 15. An eighth inner wall 90 is formed on the second fixed contact 14 side along the other side surface 15d in the width direction of the movable contact 15 by providing a gap 89 therebetween.

  As a result, a third arc extinguishing space 91 is formed at a position surrounded by the third inner wall 81, the fifth inner wall 84 and the side wall 18a of the insulating cylindrical portion 18, and the third inner wall 81, the sixth inner wall 86 and the side wall 18a A fourth arc extinguishing space 92 is formed at the enclosed position. A fifth arc extinguishing space 93 is formed at a position surrounded by the fourth inner wall 82, the seventh inner wall 88, and the side wall 18b, and a fifth arc extinguishing space 93 is formed at the position surrounded by the fourth inner wall 82, the eighth inner wall 90, and the side wall 18b. A 6 arc extinguishing space 94 is formed.

Further, the third to sixth arc extinguishing spaces 91, the gaps 83, 85, 87, 89 are disposed at positions surrounded by the fifth inner wall 84, the sixth inner wall 86, the seventh inner wall 88, and the eighth inner wall 90. A gas inflow space 95 communicating with 92, 93, 94 is formed.
Here, the inner wall rising along one side in the width direction of the movable contact according to the present invention corresponds to the fifth inner wall 84 and the sixth inner wall 86, and rises along the other side in the width direction of the movable contact according to the present invention. The inner wall corresponds to the seventh inner wall 88 and the eighth inner wall 90, and the gas passage of the present invention corresponds to the gaps 83, 85, 87, and 89.

Next, operation | movement of the electromagnetic contactor of 2nd Embodiment is demonstrated.
In the electromagnetic contactor 1 of the second embodiment, a positive electrode (+) terminal is connected to the first fixed contact 13 and a negative electrode (−) terminal is connected to the second fixed contact 14, and the opening of the contact is started. When the state is reached, as shown in FIG. 6, a first arc (not shown) is generated 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, and is movable. A second arc (not shown) is generated between the second movable contact 15b of the contact 15 and the first fixed contact 14a of the second fixed contact 14, and the current conduction state is continued by these arcs. become. 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.

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 magnet 41. The magnetic flux φ1 that exits from the N pole and flows to the S pole of the third arc extinguishing permanent magnet 42 passes near the first arc and faces outward of one side surface 15e in the longitudinal direction of the movable contact 15. Occur.
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 through 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 movable contact 15 through the vicinity of the second arc.

  As shown in FIG. 6, between the first fixed contact 13a of the first fixed contact 13 and the first movable contact 15a of the movable contact 15, the first fixed contact 13a side to the first movable contact 15a side One arc extends, and the 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. It occurs toward the outside of the side surface 15e. Accordingly, a large Lorentz force is exerted on the side toward the third arc extinguishing space 91 on the side surface 15c side in the width direction of the movable contact 15 according to the Fleming left-hand rule from the relationship between the current flow of the first arc and the magnetic flux φ1. F1 occurs.

By this Lorentz force F1, the first arc generated between the first fixed contact 13a and the first movable contact 15a is stretched toward the third arc extinguishing space 91.
Further, the second arc extends from the second movable contact 15b side to the second fixed contact 14a side 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 generated by the first arc extinguishing permanent magnet 40, the second arc extinguishing permanent magnet 41, and the fourth arc extinguishing permanent magnet 43 is outside the other side surface 15f of the movable contact 15 in the longitudinal direction. It occurs toward the direction. Accordingly, a large Lorentz force is exerted on the side facing the fourth arc extinguishing space 92 on the side surface 15c side in the width direction of the movable contact 15 according to the Fleming left-hand rule from the relationship between the current flow of the second arc and the magnetic flux φ1. F2 is generated.

Due to the Lorentz force F2, the second arc generated between the second fixed contact 14a and the second movable contact 15b is stretched toward the fourth arc extinguishing space 92.
Here, the first fixed contact 13a, the second fixed contact 14a and the first movable contact 15a of the movable contact 15 and the second fixed contact 14 of the first and second fixed contacts 13, 14 are generated by the generation of the first arc and the second arc. When the temperature rises due to the arc of the movable contact 15b, the third arc extinguishing space 91 and the fourth arc extinguishing are performed while the first fixed contact 13a, the second fixed contact 14a, the first movable contact 15a and the second movable contact 15b are melted. A large amount of metal vapor is generated in the arc space 92.

After the metal vapor generated in the vicinity of the first arc collides with the side wall 18 a of the insulating cylinder portion 18, the metal vapor flows toward the first contact 13 and toward the third inner wall 81.
Further, the metal vapor generated in the vicinity of the second arc collides with the side wall 18 a of the insulating cylinder 18, and then flows toward the second contact 14 and toward the third inner wall 81.
Since the third arc extinguishing space 91 communicates with the gas inflow space 95 through the gap 83, the metal vapor generated in the third arc extinguishing space 91 and flowing toward the third inner wall 81 flows into the gas inflow space 95. To go.

Further, since the fourth arc extinguishing space 92 communicates with the gas inflow space 95 through the gap 85, the metal vapor generated in the fourth arc extinguishing space 92 and directed toward the third inner wall 81 is also in the gas inflow space 95. To flow. The metal vapor that has flowed into the gas inflow space 95 flows into the fifth arc extinguishing space 93 and the sixth arc extinguishing space 94 through the gaps 87 and 89.
Therefore, according to 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 between the second fixed contact 14a and the second movable contact 15b. A second arc is generated, and the first fixed contact 13a, the second fixed contact 14a, the first movable contact 15a, and the second movable contact 15b are melted in the third arc extinguishing space 91 and the fourth arc extinguishing space 92. Even when a large amount of metal vapor is generated, the metal vapor in the third arc extinguishing space 91 flows into the gas inflow space 95 through the gap 83, and the metal vapor in the fourth arc extinguishing space 92 passes through the gap 85. Therefore, the third arc extinguishing space 91 and the fourth arc extinguishing space 92 are prevented from being filled with the metal vapor. Accordingly, the arc extinguishing performance of the first arc and the second arc is prevented from being lowered, and the first movable contact 15a and the second movable contact of the first fixed contact 13a, the second fixed contact 14a, and the movable contact 15 are prevented. It is possible to prevent a re-arcing without deteriorating the insulation performance between 15b.

In addition, since the third inner wall 81 is provided between the third arc extinguishing space 91 and the fourth arc extinguishing space 92, it is possible to prevent the first arc and the second arc from being connected.
Here, 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, in the opening start state. The first arc between the first fixed contact 13a and the first movable contact 15a is generated toward the fifth arc extinguishing space 93, and the second arc between the second fixed contact 14a and the second movable contact 15b is Since it occurs toward the sixth arc extinguishing space 94, the metal vapor generated in the fifth arc extinguishing space 93 and the sixth arc extinguishing space 94 flows into the gas inflow space 95 through the gaps 87 and 89. . As a result, the metal vapor generated in the fifth arc extinguishing space 93 and the sixth arc extinguishing space 94 is dispersed in the gas inflow space 95, so that in the fifth arc extinguishing space 93 and the sixth arc extinguishing space 94. Suppresses the filling of metal vapor. Accordingly, the arc extinguishing performance of the first arc and the second arc is prevented from being lowered, and the first movable contact 15a and the second movable contact of the first fixed contact 13a, the second fixed contact 14a, and the movable contact 15 are prevented. It is possible to prevent a re-arcing without deteriorating the insulation performance between 15b.

  In the first and second embodiments described above, the first to fourth arc extinguishing permanent magnets 40 to 43 are fixed to the magnet support 60. However, the present invention is not limited to this. While forming the magnetic flux which passes near the opposing part of the 1st fixed contact 13a of the stationary contact 13 and the 1st movable contact 15a of the movable contact 15, and toward the left side of the left-right direction, As long as it forms a magnetic flux that passes near the second fixed contact 14a and the second movable contact 15b of the movable contact 15 and moves to the right in the left-right direction, a permanent magnet having another shape and arrangement is used. May be.

DESCRIPTION OF SYMBOLS 1 Electromagnetic contactor 2 Contact mechanism 4 Contact storage case 5 Rectangular 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 conductive plate part 13c 1st 2nd conductive plate part 13d 3rd conductive plate part 14 2nd fixed contact 14a 2nd fixed contact 14b 1st conductive plate 14c 2nd conductive plate 14d 3rd conductive plate 15 movable contact 15a 1st movable contact 15b 1st Two movable contact points 15c One side surface 15d in the width direction of the movable contactor The other side surface 15e in the width direction of the movable contactor One side surface 15f in the longitudinal direction of the movable contactor The other side surface 16, 17 in the longitudinal direction of the movable contactor Insulating cover 18 Insulating cylinder parts 19a, 19b Magnetic plate 20 Electromagnet unit 21 Upper magnetic yoke 21a Through hole 22 Movable plunger 23 Connecting shaft 24 Through hole 25 Flange part 26 Contact sp 27 C ring 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 Permanent magnet 38 for driving Through hole 39 Auxiliary yoke 40 For first arc extinguishing Permanent magnet 41 second arc extinguishing permanent magnet 42 third arc extinguishing permanent magnet 43 fourth arc extinguishing permanent magnet 45 first arc extinguishing space 46 second arc extinguishing space 60 magnet support 61 first Inner wall 62 Second inner wall 45 First arc extinguishing space 46 Second arc extinguishing space 63, 64 Vent holes 65, 66, 67, 68 Vent holes 80 Contact mechanism 81 Third inner wall 82 Fourth inner wall 83 Gap 84 Fifth inner wall 85 Gap 86 Sixth inner wall 87 Gap 88 Seventh inner wall 89 Gap 90 Eighth inner wall 91 Third arc extinguishing space 92 Fourth arc extinguishing space 93 5 arc extinguishing space 94 sixth arc extinguishing space 95 gas inflow space F1, F2 ... Lorentz force

Claims (4)

A pair of fixed contacts having fixed contacts;
A movable contact having a pair of movable contacts that can be brought into and out of contact with the fixed contacts of the pair of fixed contacts;
An insulating case formed of an insulating material which houses the pair of fixed contacts and the movable contact,
An arc extinguishing permanent magnet that is arranged around the insulating case and extends an arc generated between the pair of fixed contacts and the pair of movable contacts;
An arc extinguishing space provided in a direction in which the arc in the insulating case is stretched;
A gas inflow space formed in a separate chamber from the arc extinguishing space in the insulating case;
A gas passage communicating between the arc extinguishing space and the gas inflow space ,
In the insulating case, the movable contact is disposed with the pair of movable contacts provided at both ends in the longitudinal direction, and the pair of fixed contacts are disposed at both ends in the longitudinal direction of the movable contact. ,
A first space is formed by a first inner wall that rises along one side in the width direction of the movable contact, and an inner surface of the insulating case facing the first inner wall,
A second space is formed by the second inner wall that rises along the other side in the width direction of the movable contact, and the inner surface of the insulating case facing the second inner wall,
Forming a gas passage communicating between the first space and the second space in the pair of fixed contacts;
One of the first space and the second space is the arc extinguishing space, and the other of the first space and the second space is the gas inflow space . The covering member is attached to a part of the pair of fixed contacts, and a covering member passage communicating with the gas passage formed in the fixed contact is formed in the covering member . Contact mechanism. A pair of fixed contacts having fixed contacts ;
A movable contact having a pair of movable contacts that can be brought into and out of contact with the fixed contacts of the pair of fixed contacts;
An insulating case formed of an insulating material storing the pair of fixed contacts and the movable contact;
An arc extinguishing permanent magnet that is arranged around the insulating case and extends an arc generated between the pair of fixed contacts and the pair of movable contacts;
An arc extinguishing space provided in a direction in which the arc in the insulating case is stretched;
A gas inflow space formed in a separate chamber from the arc extinguishing space in the insulating case;
A gas passage communicating between the arc extinguishing space and the gas inflow space,
In the insulating case, the movable contact is disposed with the pair of movable contacts provided at both ends in the longitudinal direction, and the pair of fixed contacts are disposed at both ends in the longitudinal direction of the movable contact. ,
By a pair of inner walls rising along one side and the other side in the width direction of the movable contact, a gas inflow space is formed inside these inner walls,
A first space and a second space are formed by the pair of inner walls and the inner surface of the insulating case facing the pair of inner walls,
Forming a gas passage communicating the gas inflow space with the first space and the second space in the pair of inner walls;
One of the first space and the second space provided in the direction in which the arc is stretched is the arc extinguishing space,
The third space is divided into two in the longitudinal direction by a third inner wall that rises across the first space on one side in the width direction of the movable contact, and the second space on the other side in the width direction of the movable contact. the fourth interior wall which rises across the space, contact point mechanism you, wherein the second space is divided into two in the longitudinal direction. 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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