JP2016012505A - Contact mechanism, and electromagnetic contactor employing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact mechanism capable of improving an arc-extinguishing performance by generating a force that sufficiently extends an arc even if a direction (forward or backward direction) of a current flowing in a current path is changed.SOLUTION: The contact mechanism includes: a pair of stationary contacts 13 and 14 including stationary contacts 13a and 14a; a movable contact 15 including a pair of movable contacts 15a and 15b which can be contacted to and separated from the stationary contacts of the pair of stationary contacts, at both end sides in a length direction; a contact accommodation case 4 accommodating the pair of stationary contacts and the movable contact and formed from an insulation material; and a pair of arc-extinguishing permanent magnets 40 and 41 which are disposed in the contact accommodation case so as to be positioned on an extension line L connecting the stationary contacts of the pair of stationary contacts, and magnetize magnetic pole faces which are opposite to the stationary contacts, with different polarities.

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 current is interrupted, a pair of fixed contacts each having a fixed contact, and a pair of movable contacts that can be contacted and separated from the fixed contacts of the pair of fixed contacts Movable contacts with contacts on both ends in the longitudinal direction, a contact storage case formed of an insulating material that houses a pair of fixed contacts and movable contacts, and opposite sides of the movable contact in the width direction An apparatus including a pair of arc extinguishing permanent magnets arranged in a contact housing case is known (for example, Patent Document 1).

Here, the pair of arc extinguishing permanent magnets arranged in the contact housing case so as to face both side surfaces in the width direction of the movable contact are opposed to each other's opposing magnetic pole surfaces (both side surfaces in the width direction of the movable contact). The magnetic pole surface) is magnetized to the same polarity, and the opposing magnetic pole surfaces are magnetized to different polarities.
When the opposing magnetic pole surfaces of a pair of arc extinguishing permanent magnets are magnetized to the same polarity, the pair of fixed contacts and the movable contacts are moved when the movable contact is in contact between the pair of fixed contacts and the released state is changed to the released state. When a pair of arcs are generated between the contacts, the movable contact for the pair of arcs is determined by the Fleming left-hand rule from the relationship between the current flow through the current path and the magnetic flux of the pair of arc extinguishing permanent magnets. Lorentz force acts in the same direction of the width direction, and a pair of arcs are stretched. However, there is a possibility that a pair of arcs stretched in the same direction may be connected, and there is a problem in terms of arc extinguishing performance.

  On the other hand, when the opposing magnetic pole faces of the pair of arc extinguishing permanent magnets are magnetized with different polarities, when a forward current flows in the current path, it occurs between the pair of fixed magnetic pole face contacts and the movable contact. For a pair of arcs, the moving contact for a pair of arcs is determined by the Fleming's left-hand rule from the relationship between the forward current and the magnetic flux of the pair of arc extinguishing permanent magnets across the width of the movable contact. A Lorentz force directed outward in the longitudinal direction of the slab acts and a pair of arcs are stretched. However, when a current in the reverse direction flows in the current path, the movable contact of the movable contact with respect to the pair of arcs is determined by the Fleming left-hand rule from the relationship between the current in the reverse direction and the magnetic flux of the pair of arc extinguishing permanent magnets There is a possibility that arcs may be connected by the Lorentz force acting inward in the longitudinal direction, and there is a problem in terms of arc extinguishing performance.

Japanese Patent No. 3997700

  Therefore, the present invention provides a contact mechanism capable of generating a force that sufficiently stretches the arc even when the direction of the current flowing in the current path (forward direction or reverse direction) changes, and improving the arc extinguishing performance. The purpose is to provide a used magnetic 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 contact and separate from the fixed contacts of the pair of fixed contacts. A movable contact provided on both ends in the longitudinal direction; a contact storage case formed of an insulating material storing the pair of fixed contacts and the movable contact; and the fixed contacts of the pair of fixed contacts. A pair of arc extinguishing permanent magnets are arranged in the contact housing case so as to be located on the connected extension line, and the magnetic pole faces facing the fixed contacts are magnetized in different polarities.
Moreover, the electromagnetic contactor which concerns on 1 aspect of this invention is equipped with the said contact mechanism, the said movable contact is connected with the movable iron core of the electromagnet for operation, and the said pair of 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, the fixed contacts of the pair of fixed contacts are connected even if the direction of the current flowing in the current path (forward direction or reverse direction) changes. A pair of arcs generated between the magnetic flux of the pair of arc extinguishing permanent magnets arranged in the contact housing case so as to be positioned on the extension line, and the pair of fixed contacts of the pair of fixed contacts and the pair of movable contacts Because of the large Lorentz force that stretches the pair of arcs in opposite directions, there is no risk of the pair of arcs being connected, and the pair of arcs are stretched reliably to ensure extinction. be able to.

It is sectional drawing which shows the electromagnetic contactor of 1st Embodiment of this invention. It is a figure which shows the contact mechanism of 1st Embodiment of this invention. It is a figure which shows the contact mechanism of 2nd Embodiment of this invention. It is sectional drawing which shows the electromagnetic contactor of 3rd Embodiment of this invention. It is a figure which shows the contact mechanism of 3rd Embodiment of this invention. It is a figure which shows the contact mechanism of 4th Embodiment of this invention. It is a figure which shows the contact mechanism of 5th Embodiment of this invention. It is a figure which shows the contact mechanism of 6th Embodiment of this invention. It is a figure which shows the contact mechanism of 7th Embodiment of this invention. It is a figure which shows the contact mechanism of 8th Embodiment of this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, modes for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings. In addition, when the member of other embodiment is the same code | symbol with respect to 1st Embodiment, description is abbreviate | omitted in other embodiment as it is the same structural member as 1st Embodiment.
[First Embodiment]
The electromagnetic contactor 1 according to the first embodiment of the present invention shown in FIG. 1 includes a contact mechanism 2 and an electromagnet unit 20 that drives the contact mechanism 2.
The contact mechanism 2 is housed in a contact housing case 4, and the contact housing case 4 integrally includes a square tube portion 5 and a top plate portion 6 that closes the upper end of the square tube portion 5, for example, with ceramic or a synthetic resin material. Molded to form a bowl-shaped body.
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 top plate portion 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) that are inserted and fixed in the through holes 9 and 10 of the insulating substrate 6; The first and second fixed contacts 13a and 14a provided on the lower surfaces of 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. ing.
The movable contact 15 is supported by a connecting shaft 23 fixed to the fixed iron core 22 of the electromagnet unit 20.

A contact spring 26 that applies a predetermined urging force to the movable contact 15 is disposed on the upper portion of the connecting shaft 23.
The electromagnet unit 20 has a U-shaped magnetic yoke 28 that is flat when viewed from the side, and a cap 35 formed in a bottomed cylindrical shape is disposed at the center of the bottom plate portion of the magnetic yoke 28. A flange portion 35 a formed by extending outward in the radial direction at the open end of the cap 35 is sealed and joined to the lower surface of the upper magnetic yoke 21. A spool 30 is disposed outside the fixed plunger 29.

  The spool 30 has a central cylindrical portion 31 through which the cap 35 is inserted, a lower flange portion 32 protruding radially outward from the lower end portion of the central cylindrical portion 31, and a radius slightly below the upper end of the central cylindrical portion 31. And an upper flange portion 33 protruding outward in the 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.

Inside the cap 35, there are arranged a fixed iron core 22 inserted through the connecting shaft 23 and a movable iron core 24 slidably inserted into the connecting shaft 23 protruding downward from the fixed iron core 22. . A return spring 36 is attached to the outer periphery of the lower part of the connecting shaft.
Then, a gas such as hydrogen gas, nitrogen gas, a mixed gas of hydrogen and nitrogen, air, or SF _{6 is} sealed in the sealed contact housing case 4.

The movable contact 15 that constitutes the contact mechanism 2 is a conductive plate that is long in the left-right direction in FIG. 1 and made of copper, aluminum, or the like, and has a connecting shaft 23 connected to the center in the longitudinal direction. A first movable contact 15a and a second movable contact 15b are formed on the lower surfaces at both ends in the direction.
Moreover, the 1st fixed contactor 13 and the 2nd fixed contactor 14 which comprise the contact mechanism 2 consist of copper, aluminum, etc. as shown in FIGS. 1-3, and are being fixed to the insulated substrate 6. FIG.

The first fixed contact 13a of the first fixed contact 13 is opposed to the first movable contact 15a of the movable contact 15 from above, and the second fixed contact 14a of the second fixed contact 14 is also movable contact. It faces the second movable contact 15b of the child 15 from above.
The movable contact 15 is in a released state, the first movable contact 15a located on one end in the longitudinal direction and the first fixed contact 13a of the first fixed contact 13, and the first movable contact located on one end in the longitudinal direction. 15a and the first fixed contact 13a of the first fixed contact 13 are in a state of being separated at a predetermined interval.

Further, the first and second movable contacts 15 a and 15 b of the movable contact 15 are connected to the first fixed contact 13 a and the second fixed contact 14 of the first fixed contact 13 in a state where the power is turned on (turned on). The second fixed contact 14a is set to contact with a predetermined contact pressure by the contact spring 26.
Here, as shown in FIG. 1, a first arc extinguishing permanent magnet 40 and a second arc extinguishing permanent magnet 41 are fixed to a rectangular tube 5 constituting the contact housing case 4.

The first arc extinguishing permanent magnet 40 and the second arc extinguishing permanent magnet 41 are rectangular parallelepiped shapes, and are axially anisotropic magnets in which magnetic flux is generated along the thickness direction.
As shown in FIG. 2A, the first arc extinguishing permanent magnet 40 and the second arc extinguishing permanent magnet 41 are connected to the first fixed contact 13a of the first fixed contact 13 and the second fixed contact. The first arc extinguishing permanent magnet 40 is fixed to the outer wall of the rectangular tube 5 on the straight extension line L connecting the second fixed contact 14a of the child 14 and the magnetic pole surface in contact with the rectangular tube 5 is N. The second arc extinguishing permanent magnet 41 is magnetized so as to be a pole, and is magnetized so that the magnetic pole surface in contact with the rectangular tube 5 is an S pole.

As a result, as shown in FIG. 2B, the magnetic flux that flows out from the N pole of the first arc extinguishing permanent magnet 40 and flows to the S pole of the second arc extinguishing permanent magnet 41 becomes the first fixed contact. 13 first fixed contacts 13 a and the second fixed contact 14 a of the second fixed contact 14 are traversed.
The pair of arc extinguishing permanent magnets of the present invention corresponds to the first arc extinguishing permanent magnet 40 and the second arc extinguishing permanent magnet 41, and the fixed contact of the present invention is the first fixed contact 13a. Corresponding to the second fixed contact 14a, the pair of movable contacts of the present invention corresponds to the first movable contact 15a and the second movable contact 15b, and the operation electromagnet of the present invention corresponds to the electromagnet unit 20.

Next, the release state and the input state of the electromagnetic contactor 1 of the first embodiment will be described.
Now, it is assumed that the exciting coil 34 of the electromagnet unit 20 is in a non-energized state and the electromagnet unit 20 is in a released state in which the exciting force that raises the movable iron core 24 is not generated.
In this released state, the movable iron core 24 is urged downward by the return spring 36 away from the upper magnetic yoke 21.

  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 iron core 24 via the connecting shaft 23 are the first fixed contact of the first fixed contact 13. 13a, the second fixed contact 14 is spaced apart from the second fixed contact 14a by a predetermined distance downward. 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 excitation coil 34 of the electromagnet unit 20 is energized from this released state, an excitation force is generated in the electromagnet unit 20 and pushes the movable iron core 24 upward against the urging force of the return spring 36. In this way, when the movable iron core 24 is raised, the movable contact 15 connected to the movable iron core 24 via the connecting shaft 23 is also raised, and the first movable contact 15a of the movable contact 15 of the contact mechanism 2 is raised. 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, and enters the input state. 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.

Next, arc generation of the contact mechanism 2 in the first embodiment will be described with reference to FIGS. 1, 2B, and 2C.
FIG. 2B shows that the positive (+) terminal is connected to the first fixed contact 13, the negative (−) terminal is connected to the second fixed contact 14, and the current flow direction of the contact mechanism 2 is forward. It is what.
When the current supply to the load device is interrupted from the closed state of the contact mechanism 2, the energization to the excitation coil 34 of the electromagnet unit 20 is stopped.

When energization to the exciting coil 34 is stopped, the exciting force that moves the movable iron core 24 upward by the electromagnet unit 20 disappears, and the movable iron core 24 is lowered by the urging force of the return spring 36.
When the movable iron core 24 is lowered, the movable contact 15 connected via the connecting shaft 23 is lowered. Accordingly, when the contact pressure of the contact spring 26 disappears, the first movable contact 15a and the second movable contact 15b of the movable contact 15 are replaced with the first fixed contact 13a and the second fixed contact of the first fixed contact 13, respectively. A contact opening start state is established in which the contact 14 is spaced downward from the second fixed contact 14a.

  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 first fixed contact 14a of the second fixed contact 14, and the current conduction state is continued by these first and second arcs. Will be. 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.

Here, as shown in FIG. 2B, the magnetic flux that flows out from the N pole of the first arc extinguishing permanent magnet 40 and flows to the S pole of the second arc extinguishing permanent magnet 41 is the first fixed contact. 13 first fixed contacts 13 a and the second fixed contact 14 a of the second fixed contact 14 are traversed.
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 flows from the first fixed contact 13a side to the first movable contact 15a side. The current flow of one arc and the magnetic flux flowing from the first arc extinguishing permanent magnet 40 to the second arc extinguishing permanent magnet 41 arranged on the extension line L connecting the first fixed contact 13a and the second fixed contact 14a. Therefore, the first arc has a large Lorentz from the one side surface 15c in the width direction of the movable contact 15 perpendicular to the direction of current flow and the direction of magnetic flux toward the inside of the contact housing case 4 according to the Fleming left-hand rule. A force F1 is generated.

By this Lorentz force F1, the first arc generated between the first fixed contact 13a and the first movable contact 15a is stretched.
Further, a second arc flows 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, From the current flow of the second arc and the first arc extinguishing permanent magnet 40 arranged on the extended line L connecting the first fixed contact 13a and the second fixed contact 14a to the second arc extinguishing permanent magnet 41. From the relationship with the flowing magnetic flux, according to the Fleming left-hand rule, the second arc is directed from the other side surface 15d in the width direction of the movable contact 15 perpendicular to the current flow direction and the magnetic flux direction to the inside of the contact housing case 4. A large Lorentz force 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.
On the other hand, as shown in FIG. 2 (c), the negative electrode (−) terminal is connected to the first fixed contact 13, the positive electrode (+) terminal is connected to the second fixed contact 14, and the current of the contact mechanism 2 is Assuming that the flow direction is the reverse direction, between the first fixed contact 13a of the first fixed contact 13 and the first movable contact 15a of the movable contact 15, from the first movable contact 15a side to the first fixed contact 13a side. The first arc flows and the second arc extinguishing from the first arc extinguishing permanent magnet 40 arranged on the extension line L connecting the first arc current flow and the first fixed contact 13a and the second fixed contact 14a. According to Fleming's left-hand rule from the relationship with the magnetic flux flowing in the arc permanent magnet 41, the first arc is contacted from the other side surface 15d in the width direction of the movable contact 15 perpendicular to the current flow direction and the magnetic flux direction. Large Lorentz force F toward the inside of the case 4 There occurs, first arc generated between the first fixed contact 13a and the first movable contact 15a is stretched.

  When the direction of current flow in the contact mechanism 2 is reversed, the second fixed contact 14a is connected between the second fixed contact 14a of the second fixed contact 14 and the second movable contact 15b of the movable contact 15 from the second fixed contact 14a side. A second arc flows on the second movable contact 15b side, and the current flow of the second arc and the first arc extinguishing permanent arranged on the extension line L connecting the first fixed contact 13a and the second fixed contact 14a. From the relationship with the magnetic flux flowing from the magnet 40 to the second arc extinguishing permanent magnet 41, the second arc has a width direction of the movable contact 15 that is orthogonal to the direction of current flow and the direction of the magnetic flux. A large Lorentz force F2 is generated from one side surface 15c toward the inside of the contact housing case 4, and the second arc generated between the second fixed contact 14a and the second movable contact 15b is stretched.

  As described above, according to the first embodiment, even if a large current of several K amperes flows between the first fixed contact 13 and the second fixed contact 14 in the forward direction or in the reverse direction. The magnetic flux flowing from the first arc extinguishing permanent magnet 40 to the second arc extinguishing permanent magnet 41 disposed on the extended line L connecting the first fixed contact 13a and the second fixed contact 14a, and the first fixed contact 13a From the relationship between the current flow direction of the first arc generated between the first movable contact 15a and the first arc current flow and the current flow of the second arc generated between the second fixed contact 14a and the second movable contact 15b, Since the large Lorentz forces F1 and F2 that stretch and stretch the first and second arcs in opposite directions act, there is no possibility that the first and second arcs are connected, and the first and second arcs are reliably stretched and extinguished. Secure the arc It can be carried out.

  Therefore, the electromagnetic contactor 1 of the first embodiment has the first fixed contact 13a, the first movable contact 15a, and the second fixed contact even if the direction of the current flowing through the current path changes in the forward direction or the reverse direction. While the first arc and the second arc generated at 13a and the second movable contact 15b are stretched in opposite directions, a sufficiently stretching force can be generated to improve the arc extinguishing performance.

[Second Embodiment]
Next, FIG. 3 shows the contact mechanism 50 of 2nd Embodiment which concerns on this invention.
In the contact mechanism 50 according to the second embodiment, the first arc extinguishing permanent magnet 40 and the second arc extinguishing permanent magnet 41 include the first fixed contact 13 a and the second fixed contact 14 of the first fixed contact 13. On the straight extension line L connecting the second fixed contact 14a to the inner wall of the rectangular tube 5.
In the second embodiment, the first arc-extinguishing permanent magnet 40 and the second arc-extinguishing permanent magnet 41 are arranged inside the rectangular tube 5, so that the first arc-extinguishing permanent magnet 40 and the first arc-extinguishing permanent magnet 40 and the second arc-extinguishing permanent magnet 40 are arranged. Since the distance between the two arc extinguishing permanent magnets 41 is set shorter than that in the first embodiment, the first fixed contact 13a to which the first movable contact 15a comes in contact and the second movable contact 15b are provided. The magnetic flux density of the magnetic flux passing through the second fixed contact 14a that comes in contact with and separates from is increased.

  Therefore, in the second embodiment, the first arc extinguishing permanent magnet 40 and the second arc extinguishing permanent magnet 41 are connected to the first fixed contact 13 a of the first fixed contact 13 and the second fixed contact 14. Since the first movable contact 15a is brought into contact with and separated from the first movable contact 15a, the second movable contact 15b is brought into and out of contact with the first and second movable contacts 15a. The magnetic flux density of the magnetic flux passing through the second fixed contact 14a is increased, the Lorentz force F1 acting on the first arc generated between the first fixed contact 13a and the first movable contact 15a, and the second fixed The Lorentz force F2 acting on the second arc generated between the contact point 14a and the second movable contact point 15b can be set to a larger value, and the extinction can be performed by increasing the force for extending the first arc and the second arc. Improve performance It can be.

In the second embodiment, the first arc extinguishing permanent magnet 40 and the second arc extinguishing permanent magnet 41 are arranged inside the rectangular tube body 5, thereby reducing the external dimensions of the contact housing case 4. Thus, the size of the electromagnetic contactor 1 can be reduced.
Furthermore, as in the first embodiment, the second embodiment extends the first arc and the second arc in opposite directions even when the direction of the current flowing in the current path changes in the forward direction or the reverse direction. Therefore, a sufficiently stretching force can be applied to the first arc and the second arc.

[Third Embodiment]
Next, FIG.4 and FIG.5 shows the electromagnetic contactor 51 of 3rd Embodiment which concerns on this invention.
As shown in FIG. 4, the electromagnetic contactor 51 according to the third embodiment includes a first fixed contact 13 a of the first fixed contact 13 on the outer wall of the rectangular cylinder 5 of the contact storage case 4 constituting the contact mechanism 52. The first arc extinguishing permanent magnet 40 and the second arc extinguishing permanent magnet 41 are fixed along a linear extension line L connecting the second fixed contact 14 to the second fixed contact 14a.
A third arc extinguishing permanent magnet 42 is disposed in the contact housing case 4 at a position above the vertically movable region of the movable contact 15.

As shown in FIG. 5, the third arc extinguishing permanent magnet 42 is a straight extension line connecting 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. It is an axially anisotropic magnet that is disposed on L and has a rectangular parallelepiped shape and generates a magnetic flux along the thickness direction.
In this third arc extinguishing permanent magnet 42, the magnetic pole surface facing the first fixed contact 13 a of the first fixed contact 13 becomes the S pole, and the magnetic pole facing the second fixed contact 14 a of the second fixed contact 14. The surface is magnetized so as to have an N pole.

The intermediate arc extinguishing permanent magnet of the present invention corresponds to the third arc extinguishing permanent magnet 42.
In the third embodiment, since the distance between the first arc extinguishing permanent magnet 40 and the third arc extinguishing permanent magnet 42 is short, the first fixed contact 13a to which the first movable contact 15a contacts and separates is provided. Since the density of the magnetic flux passing therethrough is high and the distance between the second arc extinguishing permanent magnet 41 and the third arc extinguishing permanent magnet 42 is also short, the second fixed contact 14a where the second movable contact 15b contacts and separates. The density of the magnetic flux passing through the magnetic field increases.

  Therefore, in the third embodiment, the third arc extinguishing permanent magnet 42 is disposed on the extension line L between the first fixed contact 13 and the second fixed contact 14, thereby the first movable contact 15 a. The magnetic flux density of the magnetic flux passing through the first fixed contact 13a that contacts and separates and the second fixed contact 14a that contacts and separates the second movable contact 15b is increased, and the gap between the first fixed contact 13a and the first movable contact 15a is increased. Further, the Lorentz force F1 acting on the first arc generated in step S2 and the Lorentz force F2 acting on the second arc generated between the second fixed contact 14a and the second movable contact 15b are set to a larger value. The arc extinguishing performance can be improved by increasing the force for stretching the first arc and the second arc.

  In addition, as in the first embodiment, the third embodiment extends the first arc and the second arc in opposite directions even when the direction of the current flowing in the current path changes in the forward direction or the reverse direction. Therefore, a sufficiently stretching force can be applied to the first arc and the second arc.

[Fourth Embodiment]
Next, FIG. 6 shows a contact mechanism 53 according to a fourth embodiment of the present invention.
In the contact mechanism 53 according to the fourth embodiment, the first arc extinguishing permanent magnet 40 and the second arc extinguishing permanent magnet 41 include the first fixed contact 13 a and the second fixed contact 14 of the first fixed contact 13. Of the rectangular tube 5 on the straight line L connecting to the second fixed contact 14a and fixed to the inner wall of the rectangular tube 5 and above the vertical movable region of the movable contact 15. The third arc extinguishing permanent magnet 42 is arranged on the extension line L.

  In the fourth embodiment, a first arc extinguishing permanent magnet 40, a second arc extinguishing permanent magnet 41, and a third arc extinguishing permanent magnet 42 are arranged on an extension line L inside the rectangular tube 5. As a result, compared to the third embodiment, the distance between the first arc extinguishing permanent magnet 40 and the third arc extinguishing permanent magnet 42 is shortened, and the second arc extinguishing permanent magnet 41 and The distance between the third arc extinguishing permanent magnets 42 is also shortened.

  Therefore, compared with the third embodiment, the fourth embodiment passes through the first fixed contact 13a where the first movable contact 15a contacts and separates and the second fixed contact 14a where the second movable contact 15b contacts and separates. Since the magnetic flux density of the magnetic flux to be generated is further increased, the Lorentz force F1 acting on the first arc generated between the first fixed contact 13a and the first movable contact 15a, the second fixed contact 14a and the second movable contact The Lorentz force F2 acting on the second arc generated between 15b can be set to a larger value, and the extinguishing performance can be improved by increasing the force for stretching the first arc and the second arc. .

Further, in the fourth embodiment, the first arc extinguishing permanent magnet 40 and the second arc extinguishing permanent magnet 41 are arranged inside the rectangular cylinder 5, thereby reducing the external dimensions of the contact housing case 4. Thus, the size of the electromagnetic contactor 51 can be reduced.
In addition, as in the first embodiment, the fourth embodiment extends the first arc and the second arc in opposite directions even when the direction of the current flowing in the current path changes in the forward direction or the reverse direction. Therefore, a sufficiently stretching force can be applied to the first arc and the second arc.

[Fifth Embodiment]
Next, FIG. 7 shows a contact mechanism 54 according to a fifth embodiment of the present invention.
The contact mechanism 54 according to the fifth embodiment includes a cylindrical body 55 in which convex curved walls 55a and 55b are formed outward on both sides in the longitudinal direction, and a top plate formed integrally with the cylindrical body 55. A contact housing case 4 is formed by the portion 6.
The curvature center of the curvature wall 55a of the cylindrical body 55 substantially coincides with the first fixed contact 13a of the first fixed contact 13 inside the contact housing case 4, and the second fixed contact 14 is centered on the curvature of the curvature wall 55b. Of the second fixed contact 14a.

A fourth arc extinguishing permanent magnet 56 and a fifth arc extinguishing permanent magnet 57 are fixed to the outer wall of the cylindrical body 55.
The fourth arc extinguishing permanent magnet 56 and the second arc extinguishing permanent magnet 57 are formed in an arc shape with substantially the same curvature as the curvature walls 55a and 55b of the cylindrical body 55, and the generated magnetic flux has a radius of curvature. Is a radially anisotropic magnet that flows inward in the radial direction, which is the center position of.

The fourth arc extinguishing permanent magnet 56 and the fifth arc extinguishing permanent magnet 57 include 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. It is on the extended line L of the connecting straight line and is fixed along the outside of the curvature walls 55a and 55b of the cylindrical body 55.
The fourth arc extinguishing permanent magnet 56 is magnetized so that the concave magnetic pole surface in contact with the curvature wall 55a of the cylindrical body 55 becomes an N pole, and this fourth arc extinguishing permanent magnet. The magnetic flux emitted from the magnetic pole surface of the magnet 56 flows toward the first fixed contact 13a side of the first fixed contact 13 which is the center of curvature of the magnetic pole surface. Further, the fifth arc extinguishing permanent magnet 57 is also magnetized so that the magnetic pole surface recessed in an arc surface shape contacting the curvature wall 55b of the cylindrical body 55 becomes the S pole.

The pair of arc extinguishing permanent magnets of the present invention corresponds to the fourth arc extinguishing permanent magnet 56 and the fifth arc extinguishing permanent magnet 57.
In the fifth embodiment, the magnetic flux emitted from the north pole of the fourth arc extinguishing permanent magnet 56, which is a radial anisotropic magnet, is directed toward the first fixed contact 13a side of the first fixed contact 13 and the magnetic flux density. The magnetic flux whose magnetic flux density is increased crosses the second fixed contact 14a of the second fixed contact 14 and then flows to the S pole of the fifth arc extinguishing permanent magnet 57.

  Accordingly, in the fifth embodiment, the fourth arc extinguishing is arranged on the straight extension line L connecting the first fixed contact 13a of the first fixed contact 13 and the second fixed contact 14a of the second fixed contact 14. The permanent magnets 56 and the fifth arc extinguishing permanent magnets 57 are radial anisotropic magnets in which magnetic flux flows inward in the radial direction, so that the first fixed contact 13a to which the first movable contact 15a contacts and separates. And the magnetic flux density of the magnetic flux passing through the second fixed contact 14a to which the second movable contact 15b contacts and separates is increased, and against the first arc generated between the first fixed contact 13a and the first movable contact 15a. The Lorentz force F1 acting and the Lorentz force F2 acting on the second arc generated between the second fixed contact 14a and the second movable contact 15b can be further increased, and the first arc and second Stretch the arc It can be a by increasing improve the arc extinguishing performance.

  Also, in the fifth embodiment, similarly to the first embodiment, even if the direction of the current flowing through the current path changes in the forward direction or the reverse direction, the first arc and the second arc are stretched in the opposite directions. Therefore, a sufficiently stretching force can be applied to the first arc and the second arc.

[Sixth Embodiment]
Next, FIG. 8 shows a contact mechanism 58 according to a sixth embodiment of the present invention.
In the contact mechanism 58 of the sixth embodiment, the fourth arc extinguishing permanent magnet 56 and the fifth arc extinguishing permanent magnet 57 include the first fixed contact 13 a of the first fixed contact 13 and the second fixed contact 14. On the straight extension line L connecting the second fixed contact 14a to the inner walls of the curvature walls 55a and 55b of the cylindrical body 55.
In the sixth embodiment, the fourth arc extinguishing permanent magnet 56 and the fifth arc extinguishing permanent magnet 57 are arranged inside the cylindrical body 55, so that the fourth arc extinguishing permanent magnet 56 and the fifth arc extinguishing permanent magnet 56 are provided. Since the distance between the arc extinguishing permanent magnet 57 is set shorter than that in the fifth embodiment, the first fixed contact 13a to which the first movable contact 15a comes in contact and the second movable contact 15b are in contact. The magnetic flux density of the magnetic flux passing through the separated second fixed contact 14a is increased.

  Accordingly, in the sixth embodiment, the fourth arc extinguishing permanent magnet 56 and the fifth arc extinguishing permanent magnet 57 are replaced with the first fixed contact 13 a of the first fixed contact 13 and the second fixed contact 14. Since the first movable contact 15a contacts and separates from the first movable contact 15a, the second movable contact 15b contacts and separates by being disposed inside the cylindrical body 55 on the straight line L connecting the two fixed contacts 14a. The magnetic flux density of the magnetic flux passing through the second fixed contact 14a becomes stronger, the Lorentz force F1 acting on the first arc generated between the first fixed contact 13a and the first movable contact 15a, and the second fixed contact The Lorentz force F2 acting on the second arc generated between 14a and the second movable contact 15b can be set to a larger value, and the force for extending the first arc and the second arc is increased to extinguish the arc. To improve It can be.

In the sixth embodiment, the fourth arc extinguishing permanent magnet 56 and the fifth arc extinguishing permanent magnet 57 are arranged inside the cylindrical body 55, so that the outer dimensions of the contact housing case 4 are reduced. The size of the magnetic contactor 1 can be reduced.
Further, in the sixth embodiment, similarly to the first embodiment, even if the direction of the current flowing through the current path changes in the forward direction or the reverse direction, the first arc and the second arc are stretched in the opposite directions. Therefore, a sufficiently stretching force can be applied to the first arc and the second arc.

[Seventh Embodiment]
Next, FIG. 9 shows a contact mechanism 59 of a seventh embodiment according to the present invention.
In the contact mechanism of the seventh embodiment, 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 are arranged on the outer walls of the curvature walls 55 a and 55 b of the cylinder 55. A fourth arc extinguishing permanent magnet 56 and a fifth arc extinguishing permanent magnet 57 are fixed along an extended line L of the connecting straight lines.
In addition, a third arc extinguishing permanent magnet 42 is disposed inside the cylindrical body 55 at a position above the vertically movable region of the movable contact 15, and the third arc extinguishing permanent magnet 42 is the first fixed. The magnetic pole surface of the contact 13 facing the first fixed contact 13a is an S pole, and the magnetic pole surface of the second fixed contact 14 facing the second fixed contact 14a is an N pole.

  In the seventh embodiment, the magnetic flux emitted from the north pole of the fourth arc extinguishing permanent magnet 56, which is a radial anisotropic magnet, is directed toward the first fixed contact 13a side of the first fixed contact 13 and the magnetic flux density. Since the distance between the fourth arc extinguishing permanent magnet 56 and the third arc extinguishing permanent magnet 42 is short, the first fixed contact at which the first movable contact 15a contacts and separates Since the density of the magnetic flux passing through 13a is strong and the distance between the fifth arc extinguishing permanent magnet 57 and the third arc extinguishing permanent magnet 42 is also short, the second fixed contact at which the second movable contact 15b contacts and separates. The density of the magnetic flux passing through the contact 14a is also increased.

  Accordingly, in the seventh embodiment as well, the third arc extinguishing permanent magnet 42 is replaced with the first fixed contact 13 and the second arc extinguishing permanent magnet 56 and the fifth arc extinguishing permanent magnet 57. Since it is arranged on the extension line L between the fixed contacts 14, it passes through the first fixed contact 13a where the first movable contact 15a contacts and separates and the second fixed contact 14a where the second movable contact 15b contacts and separates. And the Lorentz force F1 acting on the first arc generated between the first fixed contact 13a and the first movable contact 15a, and the second fixed contact 14a and the second movable contact 15b. The Lorentz force F2 acting on the second arc generated between them can be further increased, and the force for extending the first arc and the second arc can be increased to improve the arc extinguishing performance.

  Also, in the seventh embodiment, similarly to the first embodiment, even if the direction of the current flowing through the current path changes in the forward direction or the reverse direction, the first arc and the second arc are stretched in the opposite directions. Therefore, a sufficiently stretching force can be applied to the first arc and the second arc.

[Eighth Embodiment]
Further, FIG. 10 shows a contact mechanism 60 according to an eighth embodiment of the present invention.
In the contact mechanism 60 of the eighth embodiment, the fourth arc extinguishing permanent magnet 56 and the fifth arc extinguishing permanent magnet 57 are the first fixed contact 13 a and the second fixed contact 14 of the first fixed contact 13. On the straight line L connecting to the second fixed contact 14a, and is fixed to the inner walls of the curvature walls 55a and 55b of the cylindrical body 55, and the angle of the upper position of the vertically movable region of the movable contact 15 A third arc extinguishing permanent magnet 42 is arranged on the extension line L inside the cylindrical body 5.

In the eighth embodiment, the fourth arc extinguishing permanent magnet 56 and the fifth arc extinguishing permanent magnet 57 are arranged on the extension line L inside the cylindrical body 55, so that the eighth embodiment is compared with the seventh embodiment. Thus, the distance between the fourth arc extinguishing permanent magnet 56 and the third arc extinguishing permanent magnet 42 is shortened, and the distance between the fifth arc extinguishing permanent magnet 57 and the third arc extinguishing permanent magnet 42 is reduced. The distance becomes shorter.
Accordingly, the eighth embodiment passes through the first fixed contact 13a where the first movable contact 15a contacts and separates and the second fixed contact 14a where the second movable contact 15b contacts and separates compared to the seventh embodiment. Since the magnetic flux density of the magnetic flux to be generated is further increased, the Lorentz force F1 acting on the first arc generated between the first fixed contact 13a and the first movable contact 15a, the second fixed contact 14a and the second movable contact The Lorentz force F2 acting on the second arc generated between 15b can be set to a larger value, and the extinguishing performance can be improved by increasing the force for stretching the first arc and the second arc. .

In the eighth embodiment, the fourth arc extinguishing permanent magnet 56 and the fifth arc extinguishing permanent magnet 57 are arranged inside the cylindrical body 55, so that the external dimensions of the contact housing case 4 are reduced. Thus, the size of the electromagnetic contactor 51 can be reduced.
In addition, as in the first embodiment, the eighth embodiment extends the first arc and the second arc in opposite directions even when the direction of the current flowing in the current path changes in the forward direction or the reverse direction. Therefore, a sufficiently stretching force can be applied to the first arc and the second arc.

DESCRIPTION OF SYMBOLS 1 ... Electromagnetic contactor, 2 ... Contact mechanism, 4 ... Contact storage case, 5 ... Square cylinder body, 6 ... Top plate part, 7 ... Flange part, 9, 10 ... Through-hole, 13 ... 1st fixed contact, 13a 1st fixed contact, 14 ... 2nd fixed contact, 14a ... 2nd fixed contact, 15 ... movable contact, 15a ... 1st fixed contact, 15b ... 2nd fixed contact, 15c ... width direction of movable contact One side surface, 15d ... the other side surface in the width direction of the movable contact, 20 ... electromagnet unit, 21 ... upper magnetic yoke, 22 ... fixed iron core, 23 ... coupling shaft, 24 ... movable iron core, 26 ... contact spring, 28 ... Magnetic yoke 30 ... Spool 31 ... Central cylindrical part 32 ... Lower flange part 33 ... Upper flange part 34 ... Excitation coil 35 ... Cap 36 Return spring 40 ... First arc extinguishing permanent magnet, 41 ... Permanent magnet for second arc extinguishing, 42 Third arc extinguishing permanent magnet, 50 ... contact mechanism, 51, 52, 53, 54 ... contact mechanism, 55 ... cylindrical body, 55a, 55b ... curvature wall, 56 ... fourth arc extinguishing permanent magnet, 57 ... Fifth arc extinguishing permanent magnet, 58, 59, 60 ... contact mechanism, F1, F2 ... Lorentz force, L ... extension line

Claims (5)

A pair of fixed contacts having fixed contacts;
A movable contact provided with a pair of movable contacts that can be brought into and out of contact with the fixed contact of the pair of fixed contacts on both ends in the longitudinal direction; and
A contact storage case formed of an insulating material storing the pair of fixed contacts and the movable contact;
A pair of arc extinguishing units arranged in the contact housing case so as to be positioned on an extension line connecting the fixed contacts of the pair of fixed contacts, and having magnetic pole surfaces facing the fixed contacts magnetized to different polarities And a permanent magnet.   The pair of arc extinguishing permanent magnets are radial anisotropic magnets in which the magnetic pole surfaces facing the fixed contacts of the pair of fixed contacts are concave in a circular arc shape. The contact mechanism according to claim 1.   The contact mechanism according to claim 1, wherein the pair of arc extinguishing permanent magnets are disposed inside the contact storage case.   An intermediate arc arc extinguishing having a surface facing the magnetic pole surface of the pair of arc extinguishing permanent magnets on the extension line between the pair of fixed contacts as a magnetic pole surface having a different polarity with respect to the magnetic pole surface 4. The contact mechanism according to claim 1, wherein a permanent magnet is disposed. The contact mechanism according to any one of claims 1 to 4, comprising:
The electromagnetic contactor, wherein the movable contact is coupled to a movable iron core of an operating electromagnet, and the pair of fixed contacts are connected to an external connection terminal.

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