JP2012104365A - Contact device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact device capable of efficiently increasing contact pressure between contacts and arc cut-off performance.SOLUTION: A contact device comprises: a contact block 3 including a pair of fixed terminals 33 which have fixed contacts 32, respectively, and a movable contact piece 35 which has movable contacts 34 arranged in a row on its top face to make contact with and separate from the fixed contacts 32, respectively; a drive unit 8 including a contact pressure spring 36 which biases the movable contact piece 35 upward, a holding body 81 which has a restriction part 813 for making contact with the top face of the movable contact piece 35 so as to restrict its upward movement, and which holds the contact pressure spring 36, a movable shaft 82 which is coupled to the holding body 81, and an electromagnet block 2 which drives the movable shaft 82; a container 61; a yoke body 63 which is fixed to the container 61 so as to be opposed to the top face of the movable contact piece 35; a pair of permanent magnets 46 which are magnetized in a front-rear direction, and the same poles of which are opposed to each other in the front-rear direction across the contact block 3; and a yoke body 64 which is fixed to the movable contact piece 35 so as to be opposed to the yoke body 63.

Description

  The present invention relates to a contact device.

  Conventionally, by arranging a yoke plate opposite to one surface of the movable contact where the movable contact is disposed, when a current flows to the movable contact due to conduction between the contacts, the fixed contact is fixed to the movable contact. There is a contact device that generates an electromagnetic force to the side to increase the contact pressure between the contacts (see, for example, Patent Document 1).

  As an example of the contact device, for example, as shown in FIG. 27, a pair of fixed terminals 33 having a fixed contact 32, a movable contact 35 having a movable contact 34, a contact pressure spring 71, and a holding body 72. And a container 73, a yoke plate 74, and a movable shaft 75. Hereinafter, description will be made with reference to the top, bottom, left, and right in FIG.

  The fixed terminal 33 is formed in a substantially cylindrical shape, and the fixed contact 32 is fixed to the lower end surface.

  The container 73 is formed of a heat-resistant material such as a ceramic material into a hollow, substantially rectangular box shape having an open lower end. The pair of fixed terminals 33 are provided through the upper surface of the container 73 so that the fixed contacts 32 are provided in parallel within the container 73.

  The movable contact 35 is formed from a conductive material in a substantially rectangular plate shape, and movable contacts 34 are respectively disposed on the left and right ends of the upper surface. The movable contact 35 is disposed in the container 73 with the movable contact 34 facing the fixed contact 32.

  The contact pressure spring 71 is formed of a coil spring, and the upper end of the contact pressure spring 71 is in contact with the approximate center of the lower surface of the movable contact 35.

  The holding body 72 is formed in a substantially rectangular frame shape in cross section, and is connected to a movable shaft 75 that is driven in the axial direction by the electromagnet block 2.

  The yoke plate 74 is formed in a substantially rectangular plate shape from a magnetic material, and is fixed to the inside of the upper surface of the holding body 72.

The movable contact 35 and the contact pressure spring 71 are provided between the bottom surface of the holding body 72 and the yoke plate 74.
Is disposed. Here, the contact pressure spring 71 is disposed in a compressed state. The lower end of the contact pressure spring 71 contacts the lower surface of the holding body 72, and the movable contact 35 is pressed upward by the contact pressure spring 71 and contacts the yoke plate 74.

  In the contact device, the movable shaft 75 is moved upward by the electromagnet block, and the holding body 72 is moved upward, that is, toward the fixed contact 32 along with the movement. Subsequently, the movable contact 35 held by the holding body 72 also moves upward along with the movement of the holding body 72, the movable contact 34 comes into contact with the fixed contact 32, and the contacts become conductive (FIG. 28 ( a)).

  When the movable contact 34 abuts on the fixed contact 32, the movement of the movable contact 34 toward the fixed contact 32 is restricted, and the position of the movable contact 35 is maintained even if the movable shaft 75 moves further upward. Does not change. On the other hand, since the holding body 72 continues to move upward, the distance between the lower surface of the holding body 72 and the movable contact 35 is shortened, and the contact pressure spring 71 is further compressed to move the movable contact 35 toward the fixed contact 32. The pressing force increases and the contact pressure between the contacts increases. Hereinafter, the distance that the holding body 72 moves after the contacts are conducted is referred to as an overtravel amount (OT amount).

  Further, since the yoke plate 74 is fixed to the holding body 72, the yoke plate 74 further moves upward in conjunction with the upward movement of the holding body 72, and the distance from the movable contact 35 (hereinafter referred to as gap G5). Is increased in proportion to the amount of OT.

  Further, the movable contact 35 is electrically connected between the contacts and a current flows, so that a magnetic flux is formed around the movable contact 35. Here, as shown in FIG. 29A, when a yoke (for example, a yoke plate 74) is not provided near the movable contact 35, a substantially concentric magnetic flux is formed around the movable contact 35. Is formed. On the other hand, as shown in FIG. 29 (b), when the yoke plate 74 is disposed in the vicinity of the movable contact 35, the magnetic flux generated around the movable contact 35 is attracted to the yoke plate 74 side and moved. The balance of magnetic flux generated around the contact 35 is lost. More specifically, in FIG. 29B, when a current flows through the movable contact 35 from the back side to the near side of the drawing, the number of magnetic fluxes that pass through the movable contact 35 from right to left is determined. However, the magnetic flux passing through the movable contact 35 from left to right is increased. Here, the magnetic flux passing through the movable contact 35 from right to left generates a downward electromagnetic force on the movable contact 35. On the other hand, the magnetic flux passing through the movable contact 35 from left to right generates an upward electromagnetic force with respect to the movable contact 35. That is, an upward electromagnetic force acts on the movable contact 35 more greatly than a downward electromagnetic force. Therefore, two upward forces of the pressing force received from the contact pressure spring 71 and the electromagnetic force act on the movable contact 35. Here, the electromagnetic force generated in the movable contact 35 increases as the gap G5 decreases, and the electromagnetic force decreases as the gap G5 increases.

  Further, in the above contact device, when the movable contact 34 contacts and separates from the fixed contact 32, in order to extinguish arc current generated between the contacts in a short time, a pair of permanent magnets 46 facing each other through the contact portion. There was something with. In the contact device including the pair of permanent magnets 46, the yoke plate 74 and the pair of permanent magnets 46 form a magnetic path passing through the vicinity of the contact portion, thereby improving the magnetic flux density in each contact portion. It was intended to improve the arc breaking performance.

JP 2010-010056

  However, in the above contact device, the gap G5 increases in proportion to the OT amount. Therefore, when the OT amount is increased, the pressing force received from the contact pressure spring 36 increases, but the electromagnetic force by the yoke plate 74 decreases. End up. Therefore, there is a problem that the contact pressure between the contacts cannot be increased efficiently.

  In the contact device, as the amount of OT increases, the distance between the yoke plate 74 and each contact portion becomes longer, and the magnetic flux density at the contact portion cannot be increased efficiently. Therefore, there has been a problem that the arc interruption performance cannot be improved efficiently.

  This invention is made | formed in view of the said reason, The objective is to provide the contact apparatus which can improve the contact pressure between contacts and arc interruption | blocking performance efficiently.

  In order to solve the above-described problems, a contact device of the present invention includes a pair of fixed terminals having fixed contacts and a movable contact having a pair of movable contacts that contact and separate from the pair of fixed contacts arranged side by side. A contact block; drive means for driving the movable contact so that the movable contact comes into contact with and away from the fixed contact; a fixed member that does not move by the driving force of the drive means; and the parallel contact direction of the movable contacts A pair of permanent magnets provided opposite to each other via a contact block and having opposite polarities on each other, and fixed to the fixed member between the pair of permanent magnets, on one surface of the movable contact And an opposing first yoke.

  In this contact device, it is preferable that the fixed member is a container that houses the movable contact.

  Further, in this contact device, the driving means abuts on one surface of the movable contact and biases the movable contact toward the fixed contact, and moves toward the fixed contact of the movable contact. A restricting portion that restricts movement of the movable member, a movable shaft that is movably inserted through an insertion hole formed in the movable contact, and is connected to the restricting portion, and the movable contact is in contact with and away from the fixed contact. It is preferable to include an electromagnet block that drives the movable shaft.

  In the contact device, the driving means includes a contact pressure spring that biases the movable contact toward the fixed contact, a holding body that holds the contact pressure spring, and a movable shaft that is coupled to the holding body. And an electromagnet block that drives the movable shaft so that the movable contact is in contact with and away from the fixed contact, and the holding body abuts on one surface of the movable contact and the fixed contact of the movable contact It is preferable to have a restricting portion that restricts movement to the side.

In this contact device, the movable contact is formed in a flat plate shape,
The first yoke is preferably formed with a recess capable of accommodating the restricting portion at a position facing the restricting portion.

  Moreover, in this contact device, it is preferable that the movable contactor is formed with a recess for accommodating the restricting portion on one surface.

  Further, in this contact device, the movable contact has a first recess for housing the restricting portion on one surface, and the first yoke has the restricting portion at a position facing the first recess. It is preferable that a second recess that can be stored is formed.

  In the contact device, the first yoke is preferably formed in a flat plate shape.

  In the contact device, the first yoke includes a flat base portion facing the movable contact and a pair of extending portions extending from the end of the base toward the movable contact. It is preferably formed in a substantially U-shaped cross section.

  The contact device preferably includes a second yoke fixed to the movable contact and facing the first yoke through the movable contact.

  In the contact device, it is preferable that at least one of the first and second yokes is formed in a flat plate shape.

  In the contact device, at least one of the first and second yokes has a flat plate-like base portion facing the movable contact, and extends from the end of the base toward the movable contact. It is preferable to form a substantially U-shaped cross section from a pair of extending portions.

  In this contact device, the gap between the first and second yokes may face the side end portion of the movable contact when at least the movable contact and the fixed contact abut. preferable.

  In the contact device, the first yoke is preferably formed thicker than the second yoke in the axial direction of the movable shaft.

  Further, in this contact device, the drive means has a contact pressure spring that biases the movable contact toward the fixed contact, and the second yoke is opposite to a surface that contacts the movable contact. It is preferable that a groove portion into which one end of the contact pressure spring is fitted is formed on the surface.

  Further, in this contact device, the drive means has a contact pressure spring that biases the movable contact toward the fixed contact, and the second yoke is opposite to a surface that contacts the movable contact. It is preferable that a protrusion that fits into one end of the contact pressure spring is formed on the surface.

  Further, in this contact device, the movable contactor is orthogonal to a first direction that is a parallel arrangement direction of the movable contacts and a second direction that is a contact / separation direction of the movable contact and the fixed contact. In the third direction, the pair of permanent magnets is preferably disposed on one side of a straight line connecting the centers of the mutually opposing surfaces.

  In the contact device, it is preferable that the pair of permanent magnets is disposed so that the centers of the surfaces facing each other are positioned on a straight extension line connecting the pair of fixed contacts.

  Further, this contact device preferably includes a pair of third yokes facing the respective end faces of the movable contact and the permanent magnet in the first direction.

  Further, in this contact device, the polarity of the first surface facing each of the pair of permanent magnets is set to be different from the polarity of the surface of the facing permanent magnet, and the first surface facing the pair of third yokes. It is preferable that the second surface includes a permanent magnet piece that is set to have a polarity different from that of the first surface and is disposed between the pair of permanent magnets.

  In the contact device, the fixed contact is preferably provided integrally with the fixed terminal or separately.

  In this contact device, it is preferable that the movable contact is provided integrally with the movable contactor or provided separately.

  In the present invention, there is an effect that it is possible to provide a contact device capable of efficiently improving the contact pressure between the contacts and the arc interruption performance.

1 is a schematic perspective view of a contact device according to Embodiment 1 of the present invention. Sectional drawing of the contact apparatus in the same as the above is shown. The principal part enlarged view of the contact apparatus in the same as the above is shown. The principal part enlarged view of another form of the contact device in the same as the above is shown. The principal part schematic of the contact apparatus in the same as the above is shown. Sectional drawing of the electromagnetic relay provided with the contact apparatus in the same as the above is shown. The external view of the electromagnetic relay provided with the contact apparatus in the same as the above is shown. The disassembled perspective view of the electromagnetic relay provided with the contact apparatus in the same as the above is shown. The principal part schematic in another form of the contact apparatus same as the above is shown. The principal part enlarged view of the contact apparatus in Embodiment 2 of this invention is shown. The principal part enlarged view of another form of the contact device in the same as the above is shown. The schematic perspective view of the sealing contact apparatus in Embodiment 3 of this invention is shown. The principal part sectional drawing of the contact apparatus in the same as the above is shown. The principal part enlarged view of the contact apparatus in the same as the above is shown. The principal part sectional drawing of the contact apparatus in the same as the above is shown. The principal part enlarged view of another form of the contact device in the same as the above is shown. The principal part enlarged view of the contact apparatus in the same as the above is shown. The principal part schematic of another form of the contact apparatus in the same as the above is shown. Sectional drawing of the contact apparatus in Embodiment 4 of this invention is shown. The disassembled perspective view of the contact apparatus in the same as the above is shown. The principal part sectional drawing of the contact apparatus in the same as the above is shown. The principal part sectional drawing of the contact apparatus in the same as the above is shown. The principal part enlarged view of the contact apparatus in the same as the above is shown. Sectional drawing in another form of the contact device same as the above is shown. Sectional drawing of the contact apparatus in the same as the above is shown. The principal part enlarged view of the contact apparatus in Embodiment 5 of this invention is shown. Sectional drawing of the contact apparatus in a prior art example is shown. Sectional drawing of the contact apparatus in the same as the above is shown. The principal part schematic of the contact apparatus in the same as the above is shown.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
The contact device of this embodiment is demonstrated using FIGS. In the following description, the vertical and horizontal directions in FIG.

  As shown in FIG. 1, the contact device of this embodiment includes a contact block 3 including a fixed terminal 33, a movable contact 35, a contact pressure spring 36, and a container 61, a drive unit 8, and a yoke body (first yoke). ) 63 and a pair of permanent magnets 46. Hereinafter, the location where the movable contact 34 contacts and separates from the fixed contact 32 is referred to as a contact portion.

  The container 61 is formed of a heat-resistant material such as ceramic in a hollow rectangular box shape having an opening on the lower surface. In addition, a pair of through holes 61 a are provided on the upper surface of the container 61 side by side.

  The fixed terminal 33 is formed in a substantially cylindrical shape by a conductive material such as copper, the upper end portion is enlarged in diameter to form a disk-shaped flange portion 33a, and the fixed contact 32 is fixed to the lower end surface. . The fixed contact 32 may be formed integrally with the fixed terminal 33. The lower end side of the fixed terminal 33 is inserted into the through hole 61 a of the container 61 from above and protrudes into the container 61. Subsequently, the fixing terminal 33 is fixed to the container 61 by brazing the flange portion 33a to the peripheral edge portion of the through hole 61a.

  A yoke body 63 is fixed between the pair of fixed terminals 33 inside the upper surface of the container 61. The yoke body 63 is formed in a substantially rectangular parallelepiped shape from a magnetic material such as soft iron, and a recess 63a is formed along the front-rear direction at a substantially center in the left-right direction of the lower surface.

  The movable contact 35 is formed of a conductive material in a substantially rectangular flat plate shape, and an insertion hole 35a is formed at the approximate center thereof. Further, the movable contact 34 is provided at both ends of the upper surface in the longitudinal direction (left-right direction). Each is fixed. The movable contact 35 is disposed with the movable contact 34 and the fixed contact 32 facing each other.

  The contact pressure spring 36 is composed of a coil spring, and is disposed in a compressed state with the axial direction directed upward and downward, and the upper end presses the movable contact 35 upward by contacting the lower surface of the movable contact 35. To do. Here, a disk-shaped protrusion 35 b is formed at substantially the center of the lower surface of the movable contact 35, and the protrusion 35 b is fitted into the upper end side inner diameter portion of the contact pressure spring 36, whereby the contact pressure spring 36. Is positioned. Instead of forming the protrusion 35b, a groove portion into which the upper end of the contact pressure spring 36 is fitted may be formed.

  The drive unit (drive means) 8 includes a movable shaft 5 and an electromagnet block 2 that drives the movable shaft 5.

  The movable shaft 5 includes a shaft portion 51 that is movably inserted through the insertion hole 35 a in the movable contact 35, and a rectangular plate-shaped regulating portion 52 that is connected to the upper end of the shaft portion 51. The electromagnet block 2 is connected to the lower end of the shaft portion 51 and is moved in the axial direction by the electromagnet block 2. The restricting portion 52 faces the upper surface of the movable contact 35 and restricts the movement of the movable contact 35 biased upward by the contact pressure spring 36 toward the fixed contact 32.

  The permanent magnet 46 is formed in a substantially rectangular parallelepiped shape and is provided substantially parallel to the short direction of the movable contact 35. Here, the permanent magnets 46 are respectively disposed on the left and right sides of the movable contact 35 so as to face each other via a gap (contact gap) between the fixed contact 32 and the movable contact 34, and a pair of permanent magnets facing each other. In 46, the polarities of the faces facing each other are the same (S pole in this embodiment). That is, the left permanent magnet 46 is provided so that the right surface is S pole and the left surface is N pole, and the right permanent magnet 46 is provided so that the left surface is the S pole and the right surface is N pole.

  Further, as shown in FIG. 3, the pair of permanent magnets 46 is disposed so that the centers of the surfaces facing each other are positioned on a straight extension line connecting the pair of fixed contacts 32. In addition, the distance between the left permanent magnet 46 and the left contact portion and the distance between the right permanent magnet 46 and the right contact portion are arranged to be substantially equal. Therefore, the magnetic field generated around each contact portion by the pair of permanent magnets 46 is formed symmetrically about the straight line X passing through the insertion hole 35a of the movable contact 35 and extending in the front-rear direction.

  Furthermore, as shown in FIG. 4, a yoke body (third yoke) 47 that connects the pair of permanent magnets 46 can be provided so as to face the end surface of the movable contact 35 in the longitudinal direction.

The yoke body 47 extends from the both ends of the base portion 47a facing the short end direction of the movable contact 35 and the base portion 47a substantially perpendicularly to the base portion 47a and is connected to the pair of permanent magnets 46, respectively. A substantially U-shape is formed from the pair of extending portions 47b. Here, the pair of extending portions 47 b are connected to the N pole side surfaces of the pair of permanent magnets 46. That is, one extending portion 47 b is connected to the right surface of the right permanent magnet 46, and the other extending portion 47 b is connected to the left surface of the left permanent magnet 46.
As a result, the magnetic flux emitted from the pair of permanent magnets 46 is attracted to the yoke body 47 to suppress the leakage magnetic flux, the magnetic flux density in the vicinity of the contact can be improved, and the force for extending the arc generated between the contacts is increased. . Accordingly, the provision of the yoke body 47 can maintain the force for extending the arc even if the size of the permanent magnet 46 is reduced, so that it is possible to reduce the size and cost of the contact device while maintaining the arc interruption performance. it can.

  In the contact device of the present embodiment, when the movable shaft 5 is moved upward by the electromagnet block 2, the restriction of the movable contact 35 toward the fixed contact 32 is released, and the movable contact 35 is connected to the contact pressure spring 36. It moves to the fixed contact 32 side by the urging force. Thereby, as shown in FIG. 2, the movable contact 34 abuts on the fixed contact 32, and the contacts are electrically connected.

  Here, the arc generated between the fixed contact 32 and the movable contact 34 (between the contacts) is formed around each contact portion regardless of the direction of the current flowing through the movable contact 35. The magnetic flux is stretched away from each other. Here, in FIG. 3, when the current flows from the left to the right through the movable contact 35, the arc generated between the left contacts is stretched to the left rear, and the arc generated between the right contacts is stretched to the right rear. .

  As shown in FIG. 4, the yoke body 63 is provided between the pair of permanent magnets 46 so as to face the upper surface of the movable contact 35. Therefore, the yoke body 63 forms a magnetic path together with the pair of permanent magnets 46 and the yoke body 47. Here, the magnetic fluxes incident from the front surface and the rear surface of the yoke body 63 repel each other at the approximate center of the yoke body 63, exit from the left and right side surfaces of the yoke body 63, and pass through the vicinity of the contact portion to the yoke body 47. Proceed toward. Accordingly, the number of magnetic fluxes passing through the vicinity of the contact portion is increased by the yoke body 63, the force for extending the arc current is increased, and the arc breaking performance can be improved. That is, the yoke body 63 can efficiently guide the magnetic flux generated between the pair of permanent magnets 46 to the vicinity of the contact portion.

  In addition, as described with reference to FIG. 29A, when a current flows through a conductor (contactor 35) generally not provided with a yoke in the vicinity, the magnetic flux is concentrically formed with the center of the conductor as the center of the magnetic field. appear. At that time, in FIG. 29A, the number of magnetic fluxes traveling from right to left in the conductor is substantially equal to the number of magnetic fluxes traveling from left to right in the conductor, so that no electromagnetic force is generated in the conductor.

  However, in the contact device of the present embodiment, when the contacts are conducted, as shown in FIG. 5, under the influence of the yoke body 63 adjacent to the upper surface of the movable contact 35, around the movable contact 35. The balance of the generated magnetic field is lost. More specifically, in FIG. 5, most of the magnetic flux from right to left is attracted to the yoke body 63, and the movable contact is smaller than when the yoke body 63 is not provided near the movable contact 35. The number of magnetic fluxes moving from right to left in 35 decreases.

  On the other hand, in FIG. 5, the magnetic flux from the left to the right is attracted to the yoke body 63 side, so that the movable contact is smaller than when the yoke body 63 is not provided near the movable contact 35 as shown in FIG. The number of magnetic fluxes from left to right in the child 35 increases.

  Then, the upward electromagnetic force acting on the movable contact 35 by the magnetic flux from the left to the right in the movable contact 35 acts on the movable contact 35 by the magnetic flux in the movable contact 35 from the right to the left. Compared to the downward electromagnetic force, the upward electromagnetic force acts on the movable contact 35. In other words, the movable contact 35 is subjected to a force toward the vertically upward fixed contact that is substantially parallel to the displacement direction of the movable contact 35.

  Here, the vertical upward force acting on the movable contact 35 is a force in the opposite direction to the contact repulsive force (downward force) generated on the movable contact 35, and therefore the contact repulsive force is the most. It is a force that works in the direction to counteract efficiently. Therefore, the contact repulsive force can be effectively canceled by the upward electromagnetic force, and the decrease in contact pressure between the contacts can be reduced.

  As described above, in the contact device according to the present embodiment, the electromagnetic force toward the fixed contact 32 is applied to the movable contact 35 by the yoke body 63, and has stable contact opening / closing performance.

  In the contact device of this embodiment, since the yoke body 63 is fixed to the container 63 independently of the drive unit 8, the yoke body 63 is not interlocked with the movement of the movable shaft 5 in the drive unit 2. For this reason, after contact conduction, the distance (gap G1) between the yoke body 63 and the movable contact 35 does not depend on the amount of movement of the movable shaft 5 (hereinafter referred to as OT amount) after contact conduction. And the gap G1 can be kept constant. That is, even if the amount of OT is increased, the gap G1 does not increase, and the decrease of the upward electromagnetic force by the yoke body 63 acting on the movable contact 35 can be prevented, and the contact pressure between the contacts can be increased efficiently. Can do.

  Further, since the value of the gap G1 can be set independently of the amount of OT, the electromagnetic force is most effective in increasing the contact pressure between the contacts by adjusting the value of the gap G1. Can be easily performed.

  Further, since the upward electromagnetic force can be stably obtained, even if the electromagnet block 2 is made small, the proof strength (contact pressure) against the short-circuit current can be maintained, and the contact device can be downsized. . Thereby, reduction of the power consumption of a contact device and cost reduction can be aimed at.

  In the contact device of this embodiment, since the yoke body 63 is fixed to the container 61, the distance between the yoke body 63 and the contact portion does not change regardless of the amount of OT. Therefore, even when the amount of OT increases, the magnetic flux density at the contact portion does not decrease, the arc interruption performance can be improved efficiently, and the arc current can be extinguished stably.

  Furthermore, the yoke body 63 fixed to the container 61 is provided to improve the arc interruption performance, so that the force necessary to extinguish the arc can be maintained even when the size of the permanent magnet 46 is reduced. can do. That is, the contact device according to the present embodiment is capable of obtaining a more stable contact opening / closing performance by increasing the resistance to the electromagnetic repulsion force at the time of load short-circuiting and providing a stable arc interruption performance while achieving downsizing. .

  Further, as described above, since the magnetic flux density at each contact portion is substantially equal, the force for stretching the arc at each contact portion is substantially equal, and a more stable arc breaking performance can be obtained.

  In the contact device of the present embodiment, the concave portion 63a is formed in the yoke body 63. However, the concave portion 63a is closed even if both the front and rear ends are open as long as the regulating portion 52 can be accommodated. It may be what you did.

  Further, as described above, since the magnetic flux density at each contact portion is substantially equal, the force for stretching the arc at each contact portion is substantially equal, and a more stable arc breaking performance can be obtained.

  And the contact device of the said embodiment is used for an electromagnetic relay as shown in FIG. 6, for example.

  The electromagnetic relay accommodates a drive unit 8 having an electromagnet block 2, a contact block 3, yoke bodies 47 and 63, and a pair of permanent magnets 46 in a case 4 shown in FIG. Hereinafter, with reference to the vertical and horizontal directions in FIG.

  As shown in FIGS. 6 and 8, the electromagnet block 2 includes a coil bobbin 21, a pair of coil terminals 23 to which both ends of the excitation winding 22 are connected, and a fixed iron core 24 disposed and fixed in the coil bobbin 21. The movable iron core 25, the yoke 26, and the return spring 27 are provided.

  The coil bobbin 21 is formed in a substantially cylindrical shape with flange portions 21a and 21b formed at the upper and lower ends of a resin material, and an excitation winding 22 is wound around a cylindrical portion 21c between the flange portions 21a and 21b. A substantially disc-shaped recess 21 d is formed in the approximate center of the flange 21 a, and the bottom surface of the recess 21 d communicates with the inner diameter of the coil bobbin 21. Then, a bottomed cylindrical cylindrical member 28 having a flange portion 28a formed at the upper end is inserted into the inner diameter portion of the coil bobbin 21, and the flange portion 28a is housed and fixed in the recess 21d.

  Further, a movable iron core 25 formed from a magnetic material in a substantially columnar shape is disposed in the cylindrical portion 28b of the cylindrical member 28, and further, above the movable iron core 25, from a magnetic material to a substantially columnar shape. A fixed iron core 24 that is formed and faces the movable iron core 25 in the axial direction is disposed. Here, cylindrical concave portions 24 a and 25 a are formed in the approximate center of the lower surface of the fixed iron core 24 and the approximate center of the upper surface of the movable iron core 25, respectively. A return spring 27 comprising a coil spring is disposed between the fixed iron core 24 and the movable iron core 25, the upper end of the return spring 27 abuts on the bottom surface of the recess 24a, and the lower end of the return spring 27 is the recess. It contacts the bottom surface of 25a.

  The movable shaft 82 is movably inserted in the through hole 24b formed in the axial direction in the fixed iron core 24, and is further fitted in the through hole 25b formed in the axial direction in the movable iron core 25. Thus, the movable iron core 25 is connected.

  As shown in FIG. 8C, the excitation winding 22 has ends connected to a pair of terminal portions 121 provided on the flange portion 21 a of the coil bobbin 21, and via a lead wire 122 connected to the terminal portion 121. Are connected to a pair of coil terminals 23, respectively.

  The coil terminal 23 is made of a conductive material such as copper, and is connected to the lead wire 122 by solder or the like.

  As shown in FIG. 7A, the yoke 26 includes a yoke plate 26A disposed on the upper end side of the coil bobbin 21, a yoke plate 26B disposed on the lower end side of the coil bobbin 21, and the left and right sides of the yoke plate 26B. It is comprised from a pair of yoke plate 26C extended from the both ends to the yoke plate 26A side.

  The yoke plate 26A is formed in a substantially rectangular plate shape, and an insertion hole 26b is formed in the approximate center thereof. Here, a cylindrical fitting protrusion 25c protrudes from the upper end surface of the fixed iron core 25, and the fixed iron core 25 is inserted by inserting the fitting protrusion 25c into the insertion hole 26b. It is fixed to the yoke plate 26A.

  A cylindrical bush 26D made of a magnetic material is fitted into a gap formed between the inner peripheral surface on the lower end side of the coil bobbin 21 and the outer peripheral surface of the cylindrical member 28. The bush 26 </ b> D forms a magnetic circuit together with the yoke plates 26 </ b> A to 26 </ b> C, the fixed iron core 24, and the movable iron core 25.

  Moreover, as shown to Fig.7 (a), the end of the flange 38 is joined to the opening periphery of the container 61 by brazing. The other end of the flange 38 is joined to the first yoke plate 26A by brazing. In addition, permanent magnets 46 for extinguishing the yoke generated between the contacts in a short time are arranged oppositely on the left and right sides of the container 61, and a pair of permanent magnets 46 are connected to the front and rear sides of the container 61. The yoke bodies 47 are arranged so as to face each other.

  As shown in FIG. 8C, the housing 4 is formed in a substantially rectangular box shape by a resin material, and has a hollow box-type housing main body 41 having an open upper surface, and a hollow box type covering the opening of the housing main body 41. Cover 42.

  The housing main body 41 is formed with substantially triangular projecting pieces 141 on the left and right side walls, and the projecting pieces 141 are formed with insertion holes 141a used for fixing the electromagnetic relay to the mounting surface by screwing. Yes. Further, a step portion 41a is formed at the opening periphery of the upper end side of the housing main body 41, and the outer periphery is smaller than the lower end side. A pair of slits 41b into which the terminal portion 23b of the coil terminal 23 is fitted is formed on the front side of the step portion 41a. Furthermore, a pair of protrusions 41c are juxtaposed in the left-right direction on the rear surface side of the stepped portion 41a.

  The cover 42 is formed in a hollow box shape with an open bottom surface, and a pair of hole portions 42a into which the protrusions 41c of the housing body 41 are fitted when assembled to the housing body 41 are formed on the rear surface. In addition, a rectangular plate-like partition portion 42c is formed at the center of the upper surface of the cover 42 so that the upper surface is divided into two substantially right and left, and a pair of insertion holes through which the fixed terminals 33 are inserted on both left and right sides of the partition portion 42c. 42b is formed.

  As shown in FIG. 8C, when the drive unit 8 and the contact block 3 are stored in the housing 4, a substantially rectangular shape is formed between the flange 21 b at the lower end of the coil bobbin 21 and the bottom surface of the housing body 41. A lower cushion rubber 43 is interposed. Further, between the container 61 and the cover 42, an upper cushion rubber 44 having an insertion hole 44a through which the flange portion 33a of the fixed terminal 33 is inserted is interposed.

  In the electromagnetic relay, when the exciting winding 22 is energized, the movable iron core 25 is attracted to the fixed iron core 24 and moves upward while compressing the return spring 27. Along with this, the movable shaft 82 inserted into the movable iron core 25 moves upward. When the holding body 81 connected to the movable shaft 82 moves upward, the movable contact 35 held by the holding body 81 also moves upward. As a result, the movable contact 34 fixed to the movable contact 35 abuts on the fixed contact 32 and the contacts are conducted.

  And the said electromagnetic relay can acquire the effect similar to the said contact apparatus by providing the contact apparatus of this embodiment.

  Further, the contact device of the present embodiment may be a sealed contact device.

  In addition, as shown in FIG. 9, when the front end and the rear end are provided in contact with the inner wall of the case 4, the regulating portion 52 receives a rotational force in the winding direction of the contact pressure spring 36. Even so, rotation can be prevented without providing additional components. Here, in the present embodiment, the front end and the rear end of the contact portion 52 are in contact with the inner wall of the case 4, but only a part of the contact portion 52 is in contact with the inner wall of the case 4. May be prevented from rotating.

(Embodiment 2)
The contact device of this embodiment is demonstrated using FIG. The contact device according to the present embodiment and the contact device according to the first embodiment are different only in the arrangement of the movable contact 35 with respect to the pair of permanent magnets 46, and the structures common to those in the first embodiment are denoted by the same reference numerals. The description is omitted. Note that the description will be made assuming that the top, bottom, left, and right in FIG. Further, in the following description, it is assumed that a current flows through the movable contact 35 from left to right.

  As shown in the first embodiment, the arc generated at the left contact portion is stretched left rearward, and the arc generated at the right contact portion is stretched rearward right (see the arrow in FIG. 10). Here, in the present embodiment, the movable contact 35 is provided near the front permanent magnet 46 between the pair of permanent magnets 46. That is, the space on the rear side of the movable contact 35 is widened by the amount that the movable contact 35 is moved from the center between the pair of permanent magnets 46 toward the front permanent magnet 46.

  Therefore, in the contact device of this embodiment, when the direction of the current flowing through the movable contact 35 is rightward in FIG. 10, the distance for extending the arc can be made longer than in the first embodiment, and the forward current can be increased. As a result, the arc interruption performance can be improved.

  In addition, as shown in FIG. 11, by arranging the pair of permanent magnets 46 so that the centers of the opposing surfaces of the pair of permanent magnets 46 are located on a straight line connecting the pair of fixed contacts, The magnetic flux density near each contact portion can be increased. That is, the force for extending the arc current to the rear side becomes stronger, and the arc interruption performance can be further improved.

  In the present embodiment, the case where the direction of the current flowing through the movable contact 35 is rightward is described. However, the present embodiment is also applicable to the case where the direction of current is reverse (from right to left). However, in that case, the movable contact 35 may be disposed near the rear yoke body 47 from the center between the pair of yoke bodies 47.

  Further, the contact device of the present embodiment may be a sealed contact device.

(Embodiment 3)
The contact device of this embodiment is demonstrated using FIGS. In the following description, the vertical and horizontal directions in FIG.

  As shown in FIGS. 12 and 13, the contact device of the present embodiment includes a contact block 3 including a fixed terminal 33, a movable contact 35, a contact pressure spring 36, and a container 61, a drive unit 8, and a yoke body. (First and second yokes) 63 and 64 and a pair of permanent magnets 46 are provided.

  The container (fixing member) 61 is formed of a heat-resistant material such as ceramic in a hollow rectangular box shape opened from the lower surface. In addition, a pair of through holes 61 a are provided on the upper surface of the container 61 side by side.

  The fixed terminal 33 is formed in a substantially cylindrical shape by a conductive material such as copper, the upper end portion is enlarged in diameter to form a disk-shaped flange portion 33a, and the fixed contact 32 is fixed to the lower end surface. . The fixed contact 32 may be formed integrally with the fixed terminal 33. The lower end side of the fixed terminal 33 is inserted into the through hole 61 a of the container 61 from above and protrudes into the container 61. Subsequently, the fixing terminal 33 is fixed to the container 61 by brazing the flange portion 33a to the peripheral edge portion of the through hole 61a.

  A yoke body 63 is fixed between the pair of fixed terminals 33 inside the upper surface of the container 61. The yoke body 63 is formed in a substantially rectangular parallelepiped shape from a magnetic material such as soft iron, and a recess 63a is formed along the front-rear direction at a substantially center in the left-right direction of the lower surface. Here, the yoke body 63 is formed to have a greater thickness in the vertical direction than the yoke body 64.

  The movable contact 35 is formed in a substantially rectangular flat plate shape from a conductive material, and the movable contact 34 is fixed to both ends of the upper surface in the longitudinal direction (left-right direction). The movable contact 35 is disposed with the movable contact 34 and the fixed contact 32 facing each other. Further, the movable contact 35 is formed with a substantially rectangular parallelepiped cutout 35a at the center of the front end and the center of the rear end, respectively, and a narrow portion 351 having a smaller width than the left and right ends is formed at the center.

  The yoke body 64 is formed in a substantially U-shape from a substantially rectangular plate-shaped base plate 641 and a pair of extending walls 642 respectively extending upward from both front and rear ends of the base plate 641. And as shown in FIG.13 (b), the yoke body 64 is the said movable contact member in the state by which the narrow part 351 of the movable contact member 35 was engage | inserted by the recessed part 64b formed between a pair of extended walls 642. As shown in FIG. 35. In addition, a substantially disc-shaped protrusion 64 a is formed at the approximate center of the lower surface of the base plate 641 in the yoke body 64.

  The contact pressure spring 36 is formed of a coil spring, and is disposed with the axial direction directed in the vertical direction. The protrusion 64a of the yoke body 64 is fitted into the upper end-side inner diameter portion, thereby positioning with respect to the yoke body 64. Has been.

  The drive unit (drive means) 8 includes a holding body 81 that holds the contact pressure spring 36, a movable shaft 82 that is connected to the holding body 81, and the electromagnet block 2 that drives the movable shaft 82.

  The holding body 81 includes a substantially rectangular flat plate-like base plate 811, a pair of opposing walls 812 that extend upward from both front and rear ends of the base plate 811 and face each other, and substantially the center of the upper ends of the pair of opposing walls 812. Are formed in a substantially rectangular frame shape in cross section. Between the base plate 811 and the restricting portion 813, a movable contact 35 provided integrally with the yoke body 64 and a contact pressure spring 36 are disposed. Here, the lower end of the contact pressure spring 36 abuts on the base plate 811 and is disposed in a compressed state between the base plate 811 and the yoke body 64 to press the movable contact 35 upward.

  Then, when the contact pressure spring 36 presses the yoke body 64, the upper surface of the movable contact 35 abuts on the restricting portion 813, and movement of the movable contact 35 upward (fixed contact 32 side) is restricted. .

  The movable shaft 82 is formed in the shape of a long round bar, the upper end of which is connected to the approximate center of the base plate 811, and the electromagnet block 2 is connected to the lower end.

  The permanent magnet 46 is formed in a substantially rectangular parallelepiped shape and is provided substantially parallel to the longitudinal direction of the movable contact 35. Here, the permanent magnet 46 is disposed on the front side and the rear side of the movable contact 35 so as to face each other via a gap (contact gap) between the fixed contact 32 and the movable contact 34, and a pair of opposed magnets 46. The permanent magnets 46 have opposite polarities on opposite surfaces. Here, in the present embodiment, the pair of permanent magnets 46 are arranged in a state where the N phases face each other.

  Further, as shown in FIG. 14, in the pair of permanent magnets 46, a straight line connecting the centers of the surfaces facing each other passes through the approximate center of the pair of fixed contacts 32. In addition, the distance between the front permanent magnet 46 and each contact portion is arranged to be substantially equal to the distance between the rear permanent magnet 46 and the contact portion. Therefore, the distribution of magnetic flux around each contact portion is substantially equal.

  Furthermore, since the yoke body 63 is located between the pair of permanent magnets 46, the yoke body 63 forms a magnetic path together with the pair of permanent magnets 46, and the magnetic path passes through the vicinity of the contact portion, thereby The arc interruption performance in is improved.

  In the contact device of the present embodiment, when the movable shaft 82 is displaced upward by the electromagnet block 2, the holding body 81 is also displaced upward accordingly. Then, with the upward displacement of the holding body 81, the movable contact 35 is also displaced upward. Then, as shown in FIG. 15, the movable contact 34 provided on the movable contact 35 is brought into contact with the fixed contact 32 so that the contacts are electrically connected, and the distal end surface of the extending wall 642 of the yoke body 64 is It is close to the lower surface of the yoke body 63.

The arc generated between the fixed contact 32 and the movable contact 34 (between the contacts) is formed around each contact portion regardless of the direction of the current flowing through the movable contact 35. They are stretched away from each other by the magnetic flux. Specifically, in FIG. 14, when current flows from the left to the right through the movable contact 35, the arc generated between the left contacts is stretched forward, and the arc generated between the right contacts is stretched backward.
In FIG. 14, when current flows from the right to the left through the movable contact 35, the arc generated between the left contacts is stretched forward, and the arc generated between the right contacts is stretched backward.

  Further, as shown in FIG. 16, a pair of yoke bodies (third yokes) 47 that connect the pair of permanent magnets 46 can be provided so as to face the respective end surfaces of the movable contact 35 in the short direction. .

  The yoke body 47 extends from the both ends of the base 47a facing the end surface in the longitudinal (left and right) direction of the movable contact 35 and the base 47a substantially perpendicularly to the base 47a. It is formed in a substantially U-shape from a pair of extending portions 47b connected to the pole surfaces. As a result, the magnetic flux emitted from the pair of permanent magnets 46 is attracted to the yoke body 47 to suppress the leakage magnetic flux, the magnetic flux density in the vicinity of the contact can be improved, and the force to stretch the arc generated between the contacts increases. . Accordingly, the provision of the yoke body 47 can maintain the force for extending the arc even if the size of the permanent magnet 46 is reduced, so that it is possible to reduce the size and cost of the contact device while maintaining the arc interruption performance. it can.

  Further, when the contacts are conducted and a current flows through the movable contact 35, a magnetic field is generated around the movable contact 35, and the magnetic flux passing through the yoke body 63 and the yoke body 64 is generated as shown in FIG. As a result, a magnetic attractive force is generated between the yoke body 63 and the yoke body 64. Here, in the contact device of this embodiment, since the yoke body 63 is fixed to the container 61, the yoke body 63 is not moved by the magnetic attraction force, and the magnetic attraction force acting on the yoke body 63 is not affected. There is no transmission to the drive unit 8 side. On the other hand, since the yoke body 64 is movable in the vertical direction, it is attracted to the yoke 63 side (upward) by the magnetic attraction force and presses the movable contact 35 upward (fixed contact 32 side). That is, in the contact device of the present embodiment, an upward force acts only on the movable contact 35 by the magnetic attractive force generated between the yoke bodies 63 and 64, and the contact pressure between the contacts can be increased efficiently. .

  Further, the yoke body 63 is fixed to the container 61, and the yoke body 64 is fixed to the movable contact 35, and after the contact is conducted, the movement toward the fixed contact 32 together with the movable contact 35 is restricted. Therefore, the distance (gap G1) between the yoke bodies 63 and 64 can be kept constant regardless of the amount of movement of the movable shaft 82 (hereinafter referred to as the OT amount) after contact conduction. Furthermore, the gap G1 can be set shorter than before, and the contact pressure between the contacts can be increased and the contact pressure can be stabilized.

  Further, the yoke body 63 on the fixed terminal 32 side receives the magnetic flux from the fixed terminal 33 more strongly than the yoke body 64, thereby increasing the magnetic flux density. For this reason, increasing the thickness of the yoke body 63 in the vertical direction can increase the magnetic attractive force more efficiently than increasing the thickness of the yoke body 64 in the vertical direction. Therefore, in the contact device according to the present embodiment including the yoke body 63 formed to have a thickness in the vertical direction larger than that of the yoke body 64, the magnetic attraction force is further increased and the contact pressure between the contacts is more reliably reduced. Can be prevented.

  In addition, in order to stably operate the contact device, it is necessary to assemble the parts with respect to the holding body 81 with high accuracy. It was increasing. For example, in the contact device in the conventional example, the movable contact 35, the first and second yokes 74 and 76, and the contact pressure spring 71 need to be assembled to the holding body 81.

  On the other hand, in the contact device of this embodiment, the yoke body 63 is provided independently of the drive unit 2, and only the movable contact 35, the contact pressure spring 36, and the yoke body 64 are held by the holding body 81. That is, since only one of the two yokes (yoke bodies 63 and 64) (yoke body 64) needs to be assembled to the holding body 81, the number of parts to be assembled to the holding body 81 can be reduced as compared with the conventional case. Therefore, the assembly becomes easier than the conventional contact device, and the manufacturing cost can be reduced.

  Further, in the contact device of the present embodiment, the drive block 8 is not assembled with a component that applies force to the drive block 8 due to the magnetic attraction force. Therefore, the electromagnet block 2 does not need to have a proof strength against the magnetic attraction force, and the electromagnet block 2 can be downsized while maintaining the proof strength against a short-circuit current, thereby reducing power consumption and cost.

  Further, since the value of the gap G1 can be set independently of the amount of OT at the time of designing the contact device, the magnetic attraction is performed to increase the contact pressure between the contacts by adjusting the value of the gap G1. It is possible to easily perform a design in which force is most effective.

  In the contact device of this embodiment, since the yoke body 63 is fixed to the container 61, the distance between the yoke body 63 and the contact portion does not change regardless of the amount of OT. Therefore, even when the amount of OT increases, the magnetic flux density at the contact portion does not decrease, the arc interruption performance can be improved efficiently, and the arc current can be extinguished stably.

  Furthermore, the yoke body 63 fixed to the container 61 is provided to improve the arc interruption performance, so that the force necessary to extinguish the arc can be maintained even when the size of the permanent magnet 46 is reduced. can do. That is, the contact device according to the present embodiment is capable of obtaining a more stable contact opening / closing performance by increasing the resistance to the electromagnetic repulsion force at the time of load short-circuiting and providing a stable arc interruption performance while achieving downsizing. .

  Further, as described above, since the magnetic flux density at each contact portion is substantially equal, the force for stretching the arc at each contact portion is substantially equal, and a more stable arc breaking performance can be obtained.

  In the contact device of the present embodiment, the concave portion 63a is formed in the yoke body 63. However, the concave portion 63a is closed even if both the front and rear ends are open as long as the regulating portion 813 can be accommodated. It may be what you did.

  In the contact device of the present embodiment, the yoke body 63 is formed in a flat plate shape, and the yoke body 64 is formed in a substantially U-shaped cross section, but the yoke body 63 is formed in a substantially U-shaped cross section. The yoke body 64 may be formed in a flat plate shape. By doing so, even at the time of OT, as shown in FIG. 18, the extending wall 631 of the yoke body 63 contacts the movable contact 35, and the magnetic path of the yoke body 63 and the yoke body via the movable contact 35. The 64 magnetic paths continue to prevent leakage flux. Therefore, it is possible to suppress the occurrence of leakage magnetic flux between the yoke body 63 and the yoke body 64, and increase the magnetic attractive force. The yoke bodies 63 and 64 may both be formed in a substantially U-shaped cross section.

(Embodiment 4)
The contact device of this embodiment is demonstrated using FIGS. Hereinafter, the description will be made with reference to the vertical and horizontal directions in FIG.

  As shown in FIGS. 19 and 20, the contact device of this embodiment is implemented in that yoke bodies 65 and 66 and a movable contact 37 are used instead of the yoke bodies 63 and 64 and the movable contact 35. It is different from the contact device of form 3. Since other configurations are the same as those in the third embodiment, the same reference numerals are given and description thereof is omitted.

  The yoke body 65 is formed in a substantially rectangular parallelepiped shape from a magnetic material such as soft iron and is fixed to the inside of the upper surface of the container 61.

  The yoke body 66 is made of a magnetic material such as soft iron, and includes a base plate 661 having a substantially rectangular plate shape and four extending pieces 662 respectively extending upward from four corners of the base plate 661. In other words, a pair of extending pieces 662 are provided side by side on both front and rear ends of the base plate 661 via a gap 66a, and a pair of extending pieces 662 are provided on both left and right ends of the base plate 661 via a gap 66b. It is installed side by side.

  The movable contact 37 is formed in a substantially rectangular parallelepiped shape that is long in the left-right direction from a conductive material, and a rectangular parallelepiped notch 37a is formed in the front center and the rear surface. That is, the movable contact 37 is formed with a narrow portion 371 having a narrower width than the left and right sides at a substantially central portion in the left-right direction. Further, a concave portion 37b is formed along the front-rear direction at the approximate center of the upper surface of the narrow portion 371.

  The movable contact 37, the yoke body 66, and the contact pressure spring 36 are disposed between the pair of opposing walls 812 of the holding body 81. At this time, the yoke body 66 is fixed to the movable contact 37 in a state in which the extending piece 662 of the yoke body 66 is fitted in the notch 37a of the movable contact 37, and the recess 37b of the movable contact 37, the yoke The gap 66a of the body 66 communicates. The contact pressure spring 36 is disposed in a compressed state between the base plate 811 of the holding body 81 and the base plate 661 of the yoke body 66, and presses the yoke body 66 upward. Here, the substantially disc-shaped protrusion 66 c formed at the center of the lower surface of the base plate 661 is fitted into the inner diameter portion on the upper end side of the contact pressure spring 36, whereby the contact pressure spring 36 is positioned.

  Then, the movable contact 37 moves upward together with the yoke body 66 pressed by the contact pressure spring 36, and the restricting portion 813 of the holding body 81 is accommodated in the recess 37b of the movable contact 37 and the gap 66a of the yoke body 66. . Here, as shown in FIG. 21A, the upward movement of the movable contact 37 is restricted when the bottom surface of the concave portion 37b abuts against the restricting portion 813.

  In the contact device of the present embodiment having the above-described configuration, when the movable shaft 82 is moved upward by the electromagnet block 2, the holding body 81 moves upward along with the movement, and the movable contact provided in the holding body 81. The child 35 also moves upward. Subsequently, as shown in FIG. 22, when the movable contact 34 comes into contact with the fixed contact 32 and the contacts are electrically connected, the movable contact 37 is restricted from moving upward, and the yoke body 66 is moved to the movable contact. The upward movement is restricted by 37. Therefore, when the movable shaft 82 moves further upward, the interval between the yoke body 66 and the base plate 811 of the holding body 81 is narrowed, the amount of compression of the contact pressure spring 36 is increased, and the pressing force against the movable contact 37 is increased. growing. Here, the restricting portion 813 of the holding body 81 moves upward in the concave portion 37b of the movable contact 37 by the same distance as the OT amount. Block 2 is designed.

  Then, as shown in FIG. 23, a magnetic flux passing through the yoke bodies 65 and 66 is formed by the current flowing through the movable contact 37, and a magnetic attractive force acts between the yoke bodies 65 and 66. Here, in the contact device of the present embodiment, since the yoke body 65 is fixed to the container 61, the yoke body 65 does not move by the magnetic attraction force, but the magnetic attraction force acting on the yoke body 65. Is not transmitted to the drive unit 8 side. On the other hand, since the yoke body 66 is movable in the vertical direction, it is attracted to the yoke 65 side (upward) by the magnetic attraction force and presses the movable contact 37 upward (fixed contact 32 side). That is, in the contact device of the present embodiment, an upward force acts on the movable contact 37 by the magnetic attractive force generated between the yoke bodies 65 and 66, and the contact pressure between the contacts can be increased efficiently.

  Further, the yoke body 65 is fixed to the container 61, and the yoke body 66 is fixed to the movable contact 37, and after the contact is conducted, the movement to the fixed contact 32 side together with the movable contact 37 is restricted. Therefore, as shown in FIG. 22 (b), after the contact is conducted, the distance (gap G2) between the yoke bodies 65 and 66 can be kept constant regardless of the amount of OT, and the gap G2 is made higher than the conventional one. The contact pressure between the contacts can be increased and the contact pressure can be stabilized.

  Conventionally, there has been a contact device that prevents a decrease in contact pressure between the contacts by a magnetic attractive force acting between the two yokes. In the contact device, both of the two yokes are held by the holding body. It was what has been. Here, in order to stably operate the contact device, it is necessary to assemble the parts to the holding body with high accuracy. Therefore, as the number of parts to be assembled to the holding body increases, the number of manufacturing steps increases and the manufacturing cost increases. Was.

  On the other hand, in the contact device of this embodiment, the yoke body 65 is provided independently of the drive unit 2, and only the movable contact 35, the contact pressure spring 36, and the yoke body 66 are held by the holding body 81. That is, since only one (yoke body 66) of the two yokes (yoke bodies 65 and 66) has only to be assembled to the holding body 81, the number of parts to be assembled to the holding body 81 can be reduced as compared with the prior art. Therefore, the assembly becomes easier than the conventional contact device, and the manufacturing cost can be reduced.

  Further, in the contact device of the present embodiment, the drive block 8 is not assembled with a component that applies force to the drive block 8 due to the magnetic attraction force. Therefore, the electromagnet block 2 does not need to have a proof strength against the magnetic attraction force, and the electromagnet block 2 can be downsized while maintaining the proof strength against a short-circuit current, thereby reducing power consumption and cost.

  Further, when designing the contact device, the value of the gap G2 can be set independently of the amount of OT. Therefore, by adjusting the value of the gap G2, the magnetic attraction is increased in order to increase the contact pressure between the contacts. It is possible to easily perform a design in which force is most effective.

  Further, in the contact device of the present embodiment, as shown in FIG. 24, the yoke body 63 used in the first embodiment may be used instead of the yoke body 65. In the above case, the groove (second recess) 63a of the yoke body 63 faces the groove (first recess) 37b of the movable contactor 37 in the vertical direction, and after contact conduction, as shown in FIG. When the lower end of the recess 63a and the upper end of the recess 37b are close to each other, a rectangular moving space S surrounded by the recess 63a and the recess 37b is formed. And the control part 831 moves in the movement space S from the recessed part 37b side to the recessed part 63a side as OT amount becomes large. In this way, by using the yoke body 63 instead of the yoke body 65, the movable distance of the restricting portion 831 can be increased by the depth of the concave portion 63a, and the OT amount can be set longer to provide a larger contact. It is possible to obtain pressure.

  In addition, since the contact device in the present embodiment includes a pair of permanent magnets 46 as in the contact device shown in the first embodiment, arcs generated between the pair of contacts are stretched away from each other. This improves contact opening and closing performance.

  Further, the magnetic flux emitted from the pair of permanent magnets 46 is attracted to the yoke body 65, the leakage magnetic flux is suppressed, the magnetic flux density near each contact can be improved, and the force for extending the arc generated between the contacts increases. . Accordingly, since the yoke body 65 is provided, the force that stretches the arc generated between the contacts can be maintained even if the size of the permanent magnet 46 is reduced. Miniaturization and cost reduction can be achieved.

(Embodiment 5)
The contact device of this embodiment will be described with reference to FIG. In addition, the contact device of this embodiment is a contact device according to Embodiments 1 to 4, in which a permanent magnet piece 48 is disposed between a pair of permanent magnets 46. In addition, even if it is a case where the permanent magnet piece 48 is provided in any contact device of Embodiment 1 thru | or 4, since the same effect can be acquired, in this actual embodiment, it is permanent to the contact device of Embodiment 1. The case where the magnet piece 48 is provided will be described.

  The permanent magnet piece 48 is formed in a substantially rectangular parallelepiped shape, is disposed at the approximate center between the pair of permanent magnets 46 and faces the upper surface of the movable contact 35, and is further approximately at the center between the pair of second yokes 47. Is located. Here, the permanent magnet pieces 48 are arranged such that the surfaces facing each other with respect to the pair of permanent magnets 46 and the pair of yoke bodies 47 are substantially parallel to each other. In the present embodiment, the permanent magnet piece 48 is provided instead of the restricting portion 52, but the restricting portion 52 and the permanent magnet piece 48 may be provided separately.

  In the permanent magnet piece 48, the polarity of each surface (first surface) facing the pair of permanent magnets 46 is different from the polarity of the surface of the permanent magnet 46 facing the first surface (S). The polarity of each surface (second surface) facing the pair of first yokes 47 is set to be different from the polarity of the first surface (N pole). That is, in the permanent magnet piece 48, the polarities of the left and right side surfaces are set to N poles, and the polarities of the front and rear side surfaces are set to S poles. Therefore, the magnetic flux generated between the pair of permanent magnets 46 and between the pair of yoke bodies 47 is attracted to the permanent magnet piece 48.

  Therefore, in the contact device of the present embodiment, the provision of the permanent magnet piece 48 suppresses leakage magnetic flux between the pair of permanent magnets 46 and between the pair of yoke bodies 47, and improves the magnetic flux density near each contact portion. To do. Therefore, by providing the permanent magnet piece 48, the magnetic flux density in the vicinity of each contact portion is increased, the force for stretching the arc generated at the contact portion is increased, and the arc interruption performance can be further improved.

2 Electromagnet block 3 Contact block 8 Driving means 32 Fixed contact 33 Fixed terminal 34 Movable contact 35, 37 Movable contact 36 Contact pressure spring 37b Recess (first recess)
46 Permanent magnet 47 Yoke body (third yoke)
61 Container (fixing member)
63 Yoke body (first yoke)
63a recess (second recess)
64 Yoke body (second yoke)
81 holder 82 movable shaft 813 regulating portion

Claims (22)

A contact block comprising a pair of fixed terminals having fixed contacts, and a movable contact in which a pair of movable contacts contacting and separating from the pair of fixed contacts are arranged in parallel on one surface;
Driving means for driving the movable contact so that the movable contact is in contact with and away from the fixed contact;
A fixing member that does not move by the driving force of the driving means;
A pair of permanent magnets provided opposite to each other through the contact block in the direction in which the movable contacts are arranged, and having the same polarity on the surfaces facing each other;
A contact device comprising: a first yoke fixed to the fixed member between the pair of permanent magnets and facing one surface of the movable contact.   The contact device according to claim 1, wherein the fixed member is a container that houses the movable contact.   The driving means includes a contact pressure spring that urges the movable contact toward the fixed contact, and a regulating portion that abuts against one surface of the movable contact and restricts the movement of the movable contact toward the fixed contact. A movable shaft that is movably inserted through an insertion hole formed in the movable contact and is connected to the restricting portion, and an electromagnet that drives the movable shaft so that the movable contact contacts and separates from the fixed contact The contact device according to claim 1, further comprising a block. The driving means includes a contact pressure spring that urges the movable contact toward the fixed contact, a holding body that holds the contact pressure spring, a movable shaft that is coupled to the holding body, and the movable contact that includes the movable contact. An electromagnet block that drives the movable shaft so as to be in contact with and away from the fixed contact;
3. The contact device according to claim 1, wherein the holding body has a regulating portion that abuts on one surface of the movable contact and regulates the movement of the movable contact toward the fixed contact. The movable contact is formed in a flat plate shape,
5. The contact device according to claim 3, wherein the first yoke is formed with a recess capable of accommodating the restricting portion at a position facing the restricting portion.   5. The contact device according to claim 3, wherein the movable contact is formed with a recess for accommodating the restricting portion on one surface. 6. The movable contact is formed with a first recess for accommodating the regulating portion on one surface,
5. The contact device according to claim 3, wherein the first yoke is formed with a second recess capable of accommodating the restricting portion at a position facing the first recess.   The contact device according to claim 1, wherein the first yoke is formed in a flat plate shape.   The first yoke has a substantially U-shaped cross section from a flat plate-like base portion facing the movable contact and a pair of extending portions extending from the end of the base toward the movable contact. The contact device according to claim 1, wherein the contact device is formed as follows.   The contact device according to claim 1, further comprising a second yoke that is fixed to the movable contact and faces the first yoke through the movable contact.   The contact device according to claim 10, wherein at least one of the first and second yokes is formed in a flat plate shape.   The first and second yokes each have at least one of a flat base portion facing the movable contact, and a pair of extending portions extending from the end of the base toward the movable contact. The contact device according to claim 10, wherein the contact device is formed in a substantially U-shape in cross section.   13. The gap between the first and second yokes faces the side end of the movable contact when at least the movable contact and the fixed contact abut. Contact device.   14. The contact device according to claim 10, wherein the first yoke is formed thicker in the axial direction of the movable shaft than the second yoke. The drive means includes a contact pressure spring that biases the movable contact toward the fixed contact,
15. The groove according to claim 10, wherein the second yoke has a groove portion into which one end of the contact pressure spring is fitted on a surface opposite to a surface that contacts the movable contact. Contact device. The drive means includes a contact pressure spring that biases the movable contact toward the fixed contact,
15. The second yoke has a protrusion that fits into one end of the contact pressure spring on a surface opposite to a surface that contacts the movable contact. Contact device.   In the third direction orthogonal to the first direction that is the direction in which the movable contacts are arranged and the second direction that is the contact and separation direction of the movable contact and the fixed contact, the movable contact The contact device according to any one of claims 1 to 16, wherein the contact device is disposed on one side of a straight line connecting centers of opposing surfaces of the pair of permanent magnets.   The pair of permanent magnets are arranged so that the centers of the surfaces facing each other are located on an extension of a straight line connecting the pair of fixed contacts. Contact device.   The contact device according to any one of claims 1 to 18, further comprising a pair of third yokes facing the respective end faces in the first direction of the movable contact and the permanent magnet.   The polarity of the first surface facing each of the pair of permanent magnets is set to be different from the polarity of the surface of the facing permanent magnet, and the polarity of the second surface facing the pair of third yokes is The contact device according to claim 19, further comprising a permanent magnet piece that is set to have a polarity different from that of the first surface and is disposed between the pair of permanent magnets.   21. The contact device according to claim 1, wherein the fixed contact is provided integrally with the fixed terminal or separately. The contact device according to claim 1, wherein the movable contact is provided integrally with the movable contactor or provided separately.

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