JP2021093277A - Electromagnetic contactor - Google Patents

Abstract

To provide an electromagnetic contactor which is capable of attaining improvement in cutoff performance by preventing an arc which is generated between a stationary contact and a movable contact from moving to the inside of a movable contact element in a length direction, and suppressing short-circuiting of a contact mechanism to a metal component, and of which the number of components and the man-hours for assembly are reduced.SOLUTION: A pair of stationary contact elements 13 and 14 have a C shape, in a view from a side face, comprising: first conductive plate parts 13b and 14b in which stationary contacts 13a and 14a are provided; second conductive plate parts 13c and 14c extending from ends of the first conductive plate parts in a contacting/separating direction (vertical direction); and third conductive plate parts 13d and 14d extending from ends of the second conductive plate parts. In a movable contact element 15, a pair of extension parts 15d and 15e which extend in the contacting/separating direction (vertical direction) are formed at positions proximate to the first conductive plate parts of the pair of stationary contact elements.SELECTED DRAWING: Figure 2

Description

The present invention relates to an electromagnetic contactor that opens and closes an electric current path by contacting and separating a pair of fixed contactors and movable contactors.

The magnetic contactor includes a contact mechanism having a fixed contact and a movable contact, and an electromagnet unit for driving the contact mechanism (for example, Patent Document 1).
The electromagnetic contactor of Patent Document 1 houses a contact mechanism having a pair of fixed contactors and movable contactors in a storage container made of an insulating material, and supports the central portion of the movable contactor in the longitudinal direction. The movable shaft is connected to the electromagnet unit.
In Patent Document 1, a pair of fixed contacts (referred to as first and second fixed contacts) extend from a first conductive plate portion provided with fixed contacts and an end portion of the first conductive plate portion. It has a C-shape when viewed from the side surface including the two conductive plate portions and the third conductive plate portion extending from the end portion of the second conductive plate portion. Further, the movable contact is formed of a long conductive plate formed in a straight line, and a pair of movable contacts (referred to as first and second movable contacts) provided at both ends in the long direction are formed. , The first and second fixed contacts are arranged so as to face the fixed contacts provided on the first conductive plate portion.
In the electromagnetic contactor having the above configuration, the movable contactor moves back and forth by driving the electromagnet unit, so that the first and second movable contacts of the movable contactor are brought into contact with and separated from the fixed contacts of the first and second fixed contacts. To open and close the current path.

Japanese Patent No. 5727860 (Fig. 1)

When the magnetic contactor is released from the charged state, between the fixed contact of the first fixed contactor and the first movable contact of the movable contactor, and between the fixed contact of the second fixed contactor and the movable contactor. An arc is generated between the contact and the second movable contact.
At this time, the flow direction of the arc current between the fixed contact of the first fixed contact and the first movable contact is opposite to the flow direction of the current flowing through the second conductive plate portion of the first fixed contact. Since it is in the direction, a Lorentz force is generated toward the center side in the longitudinal direction of the movable contact due to the self-magnetic field. Further, the flow direction of the arc current between the fixed contact of the second fixed contact and the second movable contact is opposite to the flow direction of the current flowing through the second conductive plate portion of the second fixed contact. Therefore, a Lorentz force is generated toward the center side in the longitudinal direction of the movable contact due to the self-magnetic field.

Since the arc that receives this Lorentz force moves inward in the longitudinal direction of the movable contactor, there is a risk that it will short-circuit to metal parts such as the movable shaft located inside the movable contactor in the longitudinal direction and the breaking performance will deteriorate. There is.
In Patent Document 1, a magnetic component is arranged inside the second conductive plate portion of the first and second fixed contacts, and the magnetic field generated by the current flowing through the second conductive plate portion is absorbed to suppress the Lorentz force. However, there is a limit to the suppression of Lorentz force due to the magnetic saturation of magnetic parts.

Moreover, arranging the magnetic parts on the first and second fixed contacts increases the number of parts and the assembling man-hours, which is problematic in terms of manufacturing cost.
The present invention has been made to solve the above-mentioned problems, and suppresses the arc generated between the fixed contact and the movable contact from moving inward in the longitudinal direction of the movable contact, and is a metal component of the contact mechanism. Provided is an electromagnetic contactor capable of suppressing a short circuit to a contactor to improve the breaking performance, reducing the number of parts and assembling man-hours, and reducing the manufacturing cost.

In order to achieve the above object, the electromagnetic contactor according to one aspect of the present invention can be attached to and detached from a pair of fixed contacts having fixed contacts and a pair of fixed contacts in a contact storage case. A contact mechanism in which a pair of movable contacts provided at both ends in the longitudinal direction are housed, and the movable contact in the contact / separation direction in which the movable contact of the contact mechanism is brought into contact with the pair of fixed contacts. It is equipped with an electromagnet unit that drives. The pair of fixed contacts includes a first conductive plate portion provided with fixed contacts, a second conductive plate portion extending in the contacting and separating directions from the end portion of the first conductive plate portion, and an end portion of the second conductive plate portion. It has a C-shape when viewed from the side surface provided with a third conductive plate portion extending from. The movable contact has a pair of extending portions extending in the contacting / separating direction formed at a position close to the first conductive plate portion of the pair of fixed contacts.

According to the electromagnetic contactor according to the present invention, the arc generated between the fixed contact and the movable contact is suppressed from moving inward in the longitudinal direction of the movable contactor, and a short circuit of the contact mechanism to the metal part is suppressed. It is possible to improve the breaking performance, reduce the number of parts and the number of assembly steps, and reduce the manufacturing cost.

It is sectional drawing which shows the electromagnetic contactor provided with the contact mechanism and the electromagnet unit of 1st Embodiment which concerns on this invention. It is sectional drawing which shows the pair of fixed contacts which have a fixed contact which constitute the contact mechanism of 1st Embodiment, and the movable contacts which have a pair of movable contacts. It is sectional drawing which shows the pair of fixed contacts which have a fixed contact which constitute the contact mechanism of 2nd Embodiment which concerns on this invention, and the movable contact which has a pair of movable contacts. It is sectional drawing which shows the pair of fixed contacts which have a fixed contact which constitute the contact mechanism of 3rd Embodiment which concerns on this invention, and the movable contacts which have a pair of movable contacts. It is a top view which shows the magnetic contactor of 4th Embodiment which concerns on this invention. FIG. 5 is a view taken along the line IV-IV of FIG.

Next, an embodiment according to the present invention will be described with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the plane dimensions, the ratio of the thickness of each layer, etc. are different from the actual ones. Therefore, the specific thickness and dimensions should be determined in consideration of the following explanation. In addition, it goes without saying that the drawings include parts having different dimensional relationships and ratios from each other.
In addition, the embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention describes the material, shape, structure, and arrangement of constituent parts. Etc. are not specified as the following. The technical idea of the present invention may be modified in various ways within the technical scope specified by the claims stated in the claims.

[First Embodiment]
FIG. 1 shows the magnetic contactor 1 of the first embodiment according to the present invention.
The magnetic contactor 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 storage case 4, and the contact storage case 4 is made of a metal square cylinder 5 and an insulating material such as a ceramic or synthetic resin material that closes the upper end of the square cylinder 5. It includes the formed insulating substrate 6.
In the square cylinder 5, the flange portion 7 formed at the lower portion is sealed and fixed to the upper magnetic yoke 21 of the electromagnet unit 20. Through holes 9 and 10 are formed in the insulating substrate 6 at predetermined intervals.

The contact mechanism 2 includes a pair of fixed contacts 13 and 14 (hereinafter, referred to as a first fixed contact 13 and a second fixed contact 14) fixed to the insulating substrate 6 via conductor portions 11 and 12. 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 face 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 in the central portion of the movable contact 15.

A flange portion 25 projecting outward is formed in the central portion of the connecting shaft 23 in the longitudinal direction, and by inserting the connecting shaft 23 into the through hole 24 of the movable contact 15 from the upper end, the movable contact 15 can be formed. The lower center is in contact with the flange portion 25, and the contact spring 26 is inserted from the upper portion of the connecting shaft 23. Then, by arranging the spring receiver 27a that contacts the upper end of the contact spring 26 and the C ring 27b that is fixed to the upper end of the connecting shaft 23 and regulates the upper movement of the spring receiver 27a, the contact spring 26 becomes the movable contactor 15. Is given a predetermined urging force.

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

The spool 30 has a central cylindrical portion 31 through which the fixed plunger 29 is inserted, a lower flange portion 32 protruding outward in the radial direction from the lower end portion of the central cylindrical portion 31, and a radial outer portion from the upper end portion of the central cylindrical portion 31. It is composed of an upper flange portion 33 that protrudes toward the surface. Then, the exciting coil 34 is wound in the storage space composed of 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 of the magnetic yoke 28 is formed with a through hole 21a facing the central cylindrical portion 31 of the spool 30 in the central portion.

The upper 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 tubular shape, and is formed at the open end of the cap 35 extending outward in the radial direction. The flange portion 35a is hermetically joined to the lower surface of the upper magnetic yoke 21. This forms a sealed container in which the cap 35 communicates through the through hole 21a of the upper magnetic yoke 21.
The movable plunger 22 is slidably inserted into the cap 35. The movable plunger 22 is formed with a peripheral flange portion 22a protruding outward in the radial direction at an upper end portion protruding upward from the upper magnetic yoke 21.

A driving permanent magnet 37 formed in an annular shape is fixed to the upper surface of the upper magnetic yoke 21 so as to surround the peripheral flange portion 22a of the movable plunger 22. The driving permanent magnet 37 is magnetized in the vertical direction, that is, in the thickness direction so that, for example, the upper end side has an N pole and the lower end side has an S pole.
An auxiliary yoke 39 having the same outer shape as the driving permanent magnet 37 and having a through hole 38 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 22a of the movable plunger 22 comes into contact with the lower surface of the yoke 39. The sealed contact storage case 4 is filled with various gases for arc extinguishing.

Then, the back spring 36 is inserted from below the connecting shaft 23, and the back spring 36 is mounted on the outer periphery of the connecting shaft 23 in a state where one end side of the back spring 36 is in contact with the flange portion 25. Then, the lower portion of the connecting shaft 23 to which the back spring 36 is mounted is inserted into the through hole 38 of the auxiliary yoke 39, inserted into the movable plunger 22, and then fixed. As a result, the back spring 36 is arranged between the flange portion 25 of the connecting shaft 23 and the upper surface of the auxiliary yoke 39 on the inner diameter side, and the back spring 36 is predetermined in the direction in which the auxiliary yoke 39 is pressed against the permanent magnet 37 side. The urging force acts.

As shown in FIG. 2, the movable contact 15 constituting the contact mechanism 2 is a long conductive plate made of a conductive material, and has a central portion 15c in which a through hole 24 is formed in the center in the longitudinal direction. , A pair of stretched portions 15d, 15e that are bent at right angles from both ends of the central portion 15c in the longitudinal direction and extend upward, and a pair of stretched portions 15d, 15e that are bent at right angles and extend parallel to each other. The first movable contact 15a and the second movable contact 15b are formed on the lower surfaces of the pair of contact portions 15f and 15g extending parallel to the central portion 15c and the pair of contact portions 15f and 15g. ..

The first fixed contact 13 and the second fixed contact 14 constituting the contact mechanism 2 are side-view C-shaped conductive plates made of a conductive material, and are located on both ends of the movable contact 15 in the longitudinal direction. It is separated and fixed to the insulating substrate 6 via the conductor portions 11 and 12.
As shown in FIG. 2, the first fixed contact 13 is arranged on the first movable contact 15a side of the movable contact 15, faces the first movable contact 15a of the movable contact 15 from below, and has a second position. 1 The first conductive plate portion 13b provided with the fixed contact 13a on the upper surface and the second conductive plate portion that is bent at a right angle from the end of the first conductive plate portion 13b away from the movable contact 15 and extends upward. It includes a 13c and a third conductive plate portion 13d that is bent at a right angle from the upper end of the second conductive plate portion 13c and extends above one contact portion 15f of the movable contact 15. An insulating cover 16 made of an insulating material that regulates the generation of an arc is arranged on the inner surface of the first fixed contact 13 in a state where the first conductive plate portion 13b is exposed to the contact portion 15f of the movable contact 15. Has been done.

Further, as shown in FIG. 2, the second fixed contact 14 is arranged on the second movable contact 15b side of the movable contact 15, and faces the second movable contact 15b of the movable contact 15 from below. , The first conductive plate portion 14b provided with the second fixed contact 14a on the upper surface, and the second conductive plate portion 14b that is bent at a right angle from the end portion of the first conductive plate portion 14b away from the movable contact 15 and extends upward. A plate portion 14c and a third conductive plate portion 14d that is bent at a right angle from the upper end of the second conductive plate portion 14c and extends above the other contact portion 15g of the movable contact 15 are provided. An insulating cover 17 made of an insulating material that regulates the generation of an arc is arranged on the inner surface of the second fixed contact 14 in a state where the first conductive plate portion 14b is exposed to the contact portion 15 g of the movable contact 15. Has been done.

Then, one extending portion 15d of the movable contact 15 is arranged close to the first conductive plate portion 13b of the first fixed contact 13 and is movable on the first conductive plate portion 14b of the second fixed contact 14. The other extending portion 15e of the contact 15 is arranged in close proximity.
The inner peripheral surface of the first fixed contact 13 and the inner peripheral surface of the second fixed contact 14 are equipped with a magnetic plate for shielding the magnetic field generated by the current flowing through the first conductive plate portions 13b and 14b. It is not exposed and is exposed to the pair of contact portions 15f and 15g of the movable contact 15.

The contact mechanism 2 has a pair of contact portions 15f and 15g provided with the first movable contact 15a and the second movable contact 15b of the movable contact 15 on the lower surface at the release position, and the fixed contacts 13a of the fixed contacts 13 and 14. The first conductive plate portion 13b and the first conductive plate portion 14b provided with 14a on the upper surface are arranged so as to be parallel to each other in the vertical direction with a predetermined interval.
Then, at the closing position, the movable contacts 15a and 15b of the movable contacts 15 come into contact with the fixed contacts 13a and 14a of the fixed contacts 13 and 14 at a predetermined contact pressure by the contact spring 26.

Then, the contact mechanism 2 is formed by the upper magnetic yoke 21, the contact storage case 4 joined to the upper surface of the upper magnetic yoke 21, and the cap 35 joined to the lower surface of the upper magnetic yoke 21 to house the movable plunger 22 inside. , Consists of a sealed containment chamber for accommodating the connecting shaft 23 and the movable plunger 22. A gas such as hydrogen gas, nitrogen gas, a mixed gas of hydrogen and nitrogen, air, and SF ₆ is sealed in the sealed contact storage case 4.

Next, the operation of the magnetic contactor 1 of the first embodiment will be described.
It is assumed that the exciting coil 34 of the electromagnet unit 20 is in a non-excited state and is in a released state in which the electromagnet unit 20 does not generate an exciting force for lowering the movable plunger 22.
In this released state, the movable plunger 22 is urged upward by the return spring 36 away from the upper magnetic yoke 21. At the same time, the attractive force due to the magnetic force of the driving permanent magnet 37 acts on the auxiliary yoke 39, and the peripheral flange portion 22a of the movable plunger 22 is attracted. Therefore, the upper surface of the peripheral flange portion 22a of the movable plunger 22 is in contact with the lower surface of the auxiliary yoke 39.

Therefore, the first movable contact 15a and the second movable contact 15b of the movable contact 15 of the contact mechanism 2 connected to the movable plunger 22 via the connecting shaft 23 are the first fixed contact of the first fixed contact 13. 13a, the second fixed contact 14 is separated from the second fixed contact 14a by a predetermined distance upward. Therefore, the current path between the first fixed contact 13 and the second fixed contact 14 is in a cutoff 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 magnetic force is generated by the electromagnet unit 20, and the movable plunger 22 resists the urging force of the return spring 36 and the attractive force of the driving permanent magnet 37. Push down. The lowering of the movable plunger 22 is stopped when the lower surface of the peripheral flange portion 22a hits the upper surface of the upper magnetic yoke 21.

As the movable plunger 22 descends in this way, the movable contact 15 connected to the movable plunger 22 via the connecting shaft 23 also descends, and the first movable contact 15a of the movable contact 15 of the contact mechanism 2 The second movable contact 15b comes into contact with the first fixed contact 13a of the first fixed contact 13 and the second fixed contact 14a of the second fixed contact 14 with the contact pressure of the contact spring 26, and is in the charged state.
Next, when the current supply to the load is cut off from the closed pole state of the contact mechanism 2, the energization of the electromagnet unit 20 to the exciting coil 34 is stopped.

When the energization of the exciting coil 34 is stopped, the electromagnet unit 20 eliminates the exciting force that moves the movable plunger downward, so that the movable plunger rises due to the urging force of the return spring 36, and the peripheral flange portion 22 becomes the auxiliary yoke 39. The attractive force of the driving permanent magnet 37 increases as it approaches.
As the movable plunger rises, the movable contact 15 connected via the connecting shaft 24 rises. When the contact pressure is applied by the contact spring 26 in response to this, the first movable contact 15a and the second movable contact 15b of the movable contact 15 are respectively the first fixed contact 13a and the first fixed contact 13a of the first fixed contact 13. The second fixed contact 14a is in contact with each of the second fixed contacts 14a. After that, when the contact pressure of the contact spring 26 disappears, the movable contact 15 is in an open state in which the movable contact 15 is separated upward from the first fixed contact 13 and the second fixed contact 14.

In such an open state, the first movable contact 15a and the second movable contact 15b of the movable contact 15 and the first fixed contact 13a of the first fixed contact 13 and the second fixed contact 14 of the second fixed contact 14 are fixed. Arcs A1 and A2 are generated between the contacts 14a and the arcs A1 and A2, and the current energized state is continued by the arcs A1 and A2.
Here, as shown in FIG. 2, the arc A1 generated between the first fixed contact 13a of the first fixed contact 13 and the first movable contact 15a of the movable contact 15 is connected to the arc A1 from the first fixed contact 13a. The flow direction of the arc current toward the first movable contact 15a and the current flow direction of the second conductive plate portion 13c of the first fixed contact 13 are opposite to each other, so that the longitudinal direction of the movable contact 15 is caused by the self-magnetic field. A Lorentz force F1 is generated toward the inside (right side in FIG. 2).

At the same time, in the arc A1, the flow direction of the arc current and the flow direction of the current of one of the extending portions 15d of the movable contact 15 are opposite to each other, so that the self-magnetic field causes the movable contact 15 to be outside in the longitudinal direction (FIG. 2). Lorentz force F2 toward) is generated.
In this way, the Lorentz force F2 toward the outside in the longitudinal direction of the movable contact 15 is generated in the arc A1, so that the flow direction of the arc current and the current flow direction of the second conductive plate portion 13c become opposite directions. The Lorentz force F1 that is generated inward in the longitudinal direction of the arc A1 is suppressed, or the Lorentz force F1 disappears.

Further, the arc A2 generated between the first fixed contact 14a of the second fixed contact 14 and the second movable contact 15b of the movable contact 15 has an arc from the second movable contact 15b toward the second fixed contact 14a. The current flow direction and the current flow direction of the second conductive plate portion 14c of the second fixed contact 14 are opposite to each other, so that the movable contact 15 is moved inside in the longitudinal direction (left side in FIG. 2) by a self-magnetic field. The Lorentz force F3 is generated.
At the same time, in the arc A2, the flow direction of the arc current and the flow direction of the current of the other extending portion 15e of the movable contact 15 are opposite to each other, so that the self-magnetic field causes the movable contact 15 to be outside in the longitudinal direction (FIG. 2). Lorentz force F4 is generated toward the right side of).

In this way, the Lorentz force F4 toward the outside in the longitudinal direction of the movable contact 15 is generated in the arc A2, so that the flow direction of the arc current and the current flow direction of the second conductive plate portion 14c become opposite directions. The Lorentz force F3 that is generated inward in the longitudinal direction of the arc A2 is suppressed, or the Lorentz force F3 disappears.
Therefore, according to the electromagnetic contactor 1 of the first embodiment, the movable contact 15 is close to the first conductive plate portion 13b of the first fixed contact 13 and the first conductive plate portion 14b of the second fixed contact 14. By arranging a pair of extending portions 15d and 15e extending in the vertical direction, when arcs A1 and A2 are generated during the transition from the closed pole state to the open pole state of the contact mechanism 2, the arc current flow direction and The current flow direction of the pair of stretched portions 15d and 15e of the movable contact 15 is opposite to that of the current flow direction, so that the Lorentz forces F2 and 4 outward in the longitudinal direction of the movable contact 15 are generated by the self-magnetic field.

When the Lorentz forces F2 and F4 are generated, the flow direction of the arc current on the first fixed contact 13 side and the current flow direction of the second conductive plate portion 13c of the first fixed contact 13 are opposite to each other. The Lorentz force F1 generated by the movement toward the inside in the longitudinal direction of the movable contact 15 and the current flow direction of the arc current on the side of the second fixed contact 14 and the current of the second conductive plate portion 14c of the second fixed contact 14 It is possible to suppress the Lorentz force F3 toward the inside in the longitudinal direction of the movable contact 15 generated when the flow direction is opposite to that of the flow direction, or to eliminate the Lorentz forces F1 and F3.

Therefore, the arcs A1 and A2 generated between the fixed contacts 13a and 14a of the pair of fixed contacts 13 and 14 and the pair of movable contacts 15a and 15b of the movable contacts 14 move inward of the movable contacts 15. Since it is suppressed, it is possible to suppress a short circuit to a metal component such as the connecting shaft 24 and improve the breaking performance.
Here, when a large current such as a short-circuit current flows in the closed pole state of the contact mechanism 2, the fixed contacts 13a and 14a and the movable contacts 14 of the pair of fixed contacts 13 and 14 that are in contact with each other An electromagnetic force (electromagnetic repulsive force) that tends to separate from each other is generated between the pair of movable contacts 15a and 15b.

However, the pair of fixed contacts 13 and 14 are C-shaped conductive plates in a side view, and the currents of the first conductive plate portion 13b and the third conductive plate portion 13d extending in parallel with each other of the fixed contacts 13. The Lorentz force that presses the movable contact 15a against the fixed contact 13a is generated by reversing the flow direction of the first conductive plate portion 14b and the third conductive plate portion that extend parallel to each other of the fixed contacts 14. When the current flow direction of 14d is reversed, a Lorentz force is generated to press the movable contact 15b against the fixed contact 14a.

Therefore, in the present embodiment, when a large current such as a short-circuit current flows in the closed pole state of the contact mechanism 2, a pair of fixed contacts 13a and 14a of the pair of fixed contacts 13 and 14 and a pair of movable contacts 14 The electromagnetic repulsive force generated in the movable contacts 15a and 15b of the above is the fixed contact 13a of the pair of fixed contacts 13 and 14 having a C-shaped side view. The short-circuit resistance can be improved by canceling out by the Lorentz force that presses the movable contacts 15a and 15b against the 14b.
Further, in the present embodiment, the inner peripheral surfaces of the second conductive plate portion 13c and the second conductive plate portion 14c of the pair of fixed contactors 13 and 14 are provided with any member that shields the magnetic field, such as a magnetic plate. Therefore, the number of parts and the number of assembly steps can be reduced, and the manufacturing cost of the electromagnetic contactor 1 can be reduced.

[Second Embodiment]
Next, FIG. 3 shows a first fixed contactor 13, a second fixed contactor 14, and a movable contactor 15 that constitute a contact mechanism 2 of the magnetic contactor 1 of the second embodiment according to the present invention. .. The same components as those shown in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
The movable contact 15 of the present embodiment has a central portion 15c in which a through hole 24 is formed in the center in the longitudinal direction, and a pair of extending portions that are bent at right angles from both ends in the longitudinal direction of the central portion 15c and extend upward. A pair of contacts that are continuously formed in an inverted U shape from the upper ends of the pair of extending portions 15h and 15i with 15h and 15i, and the first movable contact 15a and the second movable contact 15b are formed on the end faces facing downward. It includes parts 15j and 15k.

The movable contact 15 of the present embodiment includes a pair of extending portions 15h and 15i and a pair of contact portions 15j and 15k continuous in an inverted U shape from the upper ends of the pair of extending portions 15h and 15i. Therefore, at a position close to the arcs A1 and A2 generated during the transition from the closed pole state to the open pole state of the contact mechanism 2, a pair of stretched portions 15h and 15i and a pair of stretched portions 15h and 15i and a pair of currents in opposite directions to the arcs A1 and A2 A large Lorentz force F2, 4 that flows through the contact portions 15j and 15k and flows outward in the longitudinal direction of the movable contact 15 is generated by the self-magnetic field. Therefore, as compared with the first embodiment, the arcs A1 and A2 generated between the fixed contacts 13a and 14a of the pair of fixed contacts 13 and 14 and the pair of movable contacts 15a and 15b of the movable contacts 14 are in movable contact. The movement to the inside of the child 15 is further suppressed, and the blocking performance can be improved.

[Third Embodiment]
Next, FIG. 4 shows a first fixed contactor 13, a second fixed contactor 14, and a movable contactor 15 that constitute a contact mechanism 2 of the magnetic contactor 1 according to the third embodiment of the present invention. .. In this embodiment, the movable contact 15 of the first embodiment is adopted.
In the present embodiment, a magnetic material plate 19a having a C-shape in a plan view is mounted on the inner surface of the second conductive plate portion 13c of the first fixed contactor 13, and the insulating cover 16 covers the magnetic material plate 19a from the inside. Is placed. Further, a magnetic material plate 19b having a C-shape in a plan view is also mounted on the inner surface of the second conductive plate portion 14c of the second fixed contactor 14, and the insulating cover 17 is arranged so as to cover the magnetic material plate 19b from the inside. Has been done.

When the magnetic material plate 19a is attached to the inner surface of the second conductive plate portion 13c of the first fixed contactor 13, the magnetic field generated by the current flowing through the second conductive plate portion 13c is shielded, so that the first fixed contact The Lorentz force F1 acting on the arc A1 generated between the first fixed contact 13a of the child 13 and the first movable contact 15a of the movable contact 15 is smaller than that of the first embodiment.
Further, when the magnetic material plate 19b is attached to the inner surface of the second conductive plate portion 14c of the second fixed contact 14, the magnetic field generated by the current flowing through the second conductive plate portion 14c is shielded, so that the second The Lorentz force F3 acting on the arc A2 generated between the first fixed contact 14a of the fixed contact 14 and the second movable contact 15b of the movable contact 15 is smaller than that of the first embodiment.

Therefore, in the third embodiment, the arcs A1 and A2 generated between the fixed contacts 13a and 14a of the pair of fixed contacts 13 and 14 and the pair of movable contacts 15a and 15b of the movable contacts 14 are the movable contacts 15. The movement to the inside is further suppressed, and the blocking performance can be improved.
Further, in the third embodiment, as compared with the first and second embodiments, it is difficult to reduce the man-hours by providing the magnetic plates 19a and 19b, but the blocking performance can be further improved.

[Fourth Embodiment]
Next, FIGS. 5 and 6 show the magnetic contactor 1 of the fourth embodiment according to the present invention.
In this embodiment, a metal rectangular magnet support 40 is arranged so as to cover the outer periphery of the square cylinder 5 constituting the contact storage case 4. The magnet support 40 is supported by a holding member (not shown) provided on the magnetic contactor 1.
Permanent magnets 41 to 46 for driving the first to sixth arcs are arranged on the inner circumference of the magnet support 40 so as to face the outer circumference of the square cylinder 5.
The first and second arc driving permanent magnets 41 and 42 are arranged so as to face each other in the width direction of the movable contact 15 via the square cylinder 5, and are used for driving the third and fourth arcs. The permanent magnets 43 and 44 are arranged so as to face each other of the movable contacts 15 in the width direction via the square cylinder 5. The permanent magnets 41 to 44 for driving the first to fourth arcs are magnetized so that the magnetic pole surfaces facing the square cylinder 5 are N poles.

The fifth drive permanent magnet 45 is arranged so as to face one of the longitudinal directions of the movable contact 15 (on the side of the first movable contact 15a) via the square cylinder 5, and is permanently arranged for the sixth arc drive. The magnet 46 is arranged so as to face the other side (second movable contact 15b side) of the movable contact 15 in the longitudinal direction via the square cylinder 5. The fifth and sixth arc-driving permanent magnets 45 and 46 are magnetized so that the magnetic pole surfaces facing the square cylinder 5 are S poles.
As a result, the magnetic flux φ1 that emerges from the N pole of the first arc drive permanent magnet 41 and flows through the S pole of the fifth arc drive permanent magnet 45 and the fifth arc exit from the N pole of the third arc drive permanent magnet 43. The magnetic flux φ1 flowing through the S pole of the arc drive permanent magnet 45 passes near 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 to the left and right. It crosses to the left in the direction with a large magnetic flux density.

Further, the magnetic flux φ1 that emerges from the N pole of the second arc driving permanent magnet 42 and flows through the S pole of the sixth arc driving permanent magnet 46 and the sixth arc exiting from the N pole of the fourth arc driving permanent magnet 44. The magnetic flux φ1 flowing through the S pole of the driving permanent magnet 46 passes near the facing portion between the second fixed contact 14a of the second fixed contact 14 and the second movable contact 15b of the movable contact 15 in the left-right direction. It crosses to the right with a large magnetic flux density.

In this way, near 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, and the second fixed contact 14a of the second fixed contact 14 in movable contact. When the magnetic flux φ1 crosses the vicinity of the portion of the child 15 facing the second movable contact 15b, the magnetic flux φ1 is formed between the first fixed contact 13a of the first fixed contact 13 and the first movable contact 15a of the movable contact 15. The arc A2 generated between the generated arc A1 and the first fixed contact 14a of the second fixed contact 14 and the second movable contact 15b of the movable contact 15 is the current flow and magnetic flux φ1 of the arcs A1 and A2. According to Fleming's left-hand rule, a large Lorentz force is generated on one side surface side of the movable contact 15 in the width direction toward the arc-extinguishing space.
Therefore, also in the fourth embodiment, the arcs A1 and A2 generated between the fixed contacts 13a and 14a of the pair of fixed contacts 13 and 14 and the pair of movable contacts 15a and 15b of the movable contacts 14 are the movable contacts 15. The movement to the inside is suppressed, and the blocking performance can be improved.

1 Electromagnetic contactor 2 Contact mechanism 4 Contact storage case 5 Square cylinder 6 Insulated substrate 7 Flange portion 9, 10 Through hole 11, 12 Conductor portion 13 First fixed contact 13a First fixed contact 13b First conductive plate portion 13c First 2 Conductive plate 13d 3rd conductive plate 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 2 Movable contact 15c Central part 15d, 15e Stretched part 15f, 15g Contact part 15h, 15i Stretched part 15j, 15k Contact part 18 Insulated cylinder part 19a, 19b Magnetic material plate 20 Electromagnet unit 21 Upper magnetic yoke 21a Through hole 22 Movable plunger 22a Peripheral flange part 23 Connecting shaft 24 Through hole 25 Flange part 26 Contact spring 27a Spring receiver 27b C ring 28 Magnetic yoke 29 Fixed plunger 30 Spool 31 Central cylindrical part 32 Lower flange part 33 Upper flange part 34 Exciting coil 35 Cap 35a Flange part 36 Return spring 37 Permanent magnet for driving 38 Through hole 39 Auxiliary yoke 40 Magnet support 41-46 Permanent magnet for driving the 1st to 6th arcs

Claims (3)

In the contact storage case, a pair of fixed contacts having fixed contacts and a pair of movable contacts having a pair of movable contacts that can be contacted and separated from the fixed contacts of the pair of fixed contacts are provided at both ends in the longitudinal direction. The stored contact mechanism and
An electromagnet unit for driving the movable contact in the contacting / separating direction in which the movable contact of the contact mechanism comes into contact with the pair of fixed contacts is provided.
The pair of fixed contacts include a first conductive plate portion provided with the fixed contact, a second conductive plate portion extending in the contacting / separating direction from an end portion of the first conductive plate portion, and the second conductive plate portion. It has a C-shape when viewed from the side surface provided with a third conductive plate portion extending from the end portion of the plate portion.
The movable contactor is an electromagnetic contactor characterized in that a pair of extending portions extending in the contacting and separating directions are formed at positions close to the first conductive plate portion of the pair of fixed contactors. .. The movable contactor is formed of a conductive plate of a long member, and has a central portion connected to a connecting shaft of the electromagnet unit and a first conductive plate portion of the pair of fixed contactors from both ends in the longitudinal direction of the central portion. The pair of stretched portions extending in the contacting and disengaging direction in close proximity to the above, and the pair extending in a direction facing the first conductive plate portion of the pair of fixed contactors from the ends of the pair of stretched portions. The electromagnetic contactor according to claim 1, further comprising a pair of contact portions provided with movable contacts. The electromagnetic contactor according to claim 1 or 2, wherein a magnetic material plate is arranged along the inner surface of the second conductive plate portion of the pair of fixed contactors.

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