JP2012104363A - 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 opposed to each other 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, it has first and second yokes that face each other via the movable contact, and is generated between the first and second yoke when the contact points are connected and current flows through the movable contact. There is a contact device in which contact pressure between contacts is increased by a magnetic attraction force (see, for example, Patent Document 1).

  As an example of the contact device, for example, as shown in FIG. 18, 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, a holding body 72, , A container 73, first and second yokes 74 and 76, 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 second yoke 76 is formed in a substantially rectangular plate shape from a magnetic material, and is fixed to the movable contact 35 in contact with the lower surface of the movable contact 35.

  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 second yoke 76.

  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 an electromagnet block.

  The first yoke 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, the second yoke 76, and the contact pressure spring 71 are disposed between the bottom surface of the holding body 72 and the first yoke 74. Here, the contact pressure spring 71 is disposed in a compressed state. The contact spring 71 has a lower end in contact with the lower surface of the holding body 72 and an upper end in contact with the lower surface of the second yoke 76 to press the second yoke 76 and the movable contact 35 upward. Thereby, the movable contact 35 abuts on the first yoke 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 and the second yoke 76 held by the holding body 72 also move 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 are electrically connected. (See FIG. 19A).

  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).

  In addition, a magnetic flux is formed around the movable contact 35 due to conduction between the contacts and current flow. Here, as shown in FIG. 20, the magnetic flux is formed in a concentric shape passing through the first and second yokes 74 and 76. The first and second yokes 74 and 76 are magnetized by the magnetic flux, and a magnetic attractive force is generated between the first and second yokes 74 and 76.

  The second yoke 76 receives an attractive force in the direction of the first yoke 74 (upward) by the magnetic attractive force. Here, since the second yoke 76 is fixed to the lower surface of the movable contact 35, a magnetic attraction force acts on the second yoke 76, thereby causing the second yoke 76 to move toward the movable contact 35. The upward pressing force works to increase the contact pressure between the contacts. That is, the movable contact 35 has two upward forces, an upward first pressing force caused by the restoring force of the contact pressure spring 36 and an upward second pressing force caused by the magnetic attraction force. Work.

  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, the first yoke 74 fixed to the holding body 72 receives an attractive force in the direction of the second yoke 76 (downward) due to the magnetic attractive force generated between the first and second yokes 74 and 76. Therefore, a downward force acts on the holding body 72. For this reason, there is a possibility that the holding body 72 moves downward. When the holding body 72 moves downward, the distance between the lower surface of the holding body 72 and the movable contact 35 becomes long, and the contact pressure spring 71 is compressed. The amount becomes smaller. As a result, the first pressing force may be reduced, and the contact pressure between the contacts may be reduced.

  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, a contact pressure spring that urges the movable contact toward the fixed contact, and a restricting portion that contacts one surface of the movable contact and restricts the movement of the movable contact toward the fixed contact And a drive comprising: a holding body that holds the contact pressure spring; a movable shaft connected to the holding body; and an electromagnet block that drives the movable shaft so that the movable contact contacts and separates from the fixed contact. And a fixed member that does not move by the driving means, and is provided opposite to each other via the contact block in a direction perpendicular to the direction in which the movable contacts are arranged in parallel and the direction in which the movable contact and the fixed contact are separated from each other. A pair of permanent magnets magnetized along the facing direction, a first yoke fixed to the fixed member between the pair of permanent magnets and facing one surface of the movable contact, and the movable contact A second yoke fixed to the child and facing the first yoke; and a pair of third yokes provided facing each end face of the movable contact in the direction in which the movable contacts are arranged; One of the pair of third yokes is connected between N poles of the pair of permanent magnets, and the other is connected between S poles of the pair of permanent magnets.

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

  In this contact device, it is preferable that the movable contact is formed in a flat plate shape, and the first yoke is formed with a recess capable of accommodating the restriction portion at a position facing the restriction 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, it is preferable that at least one of the first and second yokes is 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.

  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 pair of permanent magnets are arranged to face one surface of the movable contact, and the polarity on one side is different from the polarity on one side of the permanent magnet in the first direction. It is preferable to provide a permanent magnet piece that is set to be different from the polarity of the other side of the permanent magnet.

  In this contact device, it is preferable that 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.

  In the contact device, it is preferable that 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.

  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.

The schematic perspective view of the sealing contact apparatus in Embodiment 1 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 cross-sectional schematic 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 external view of the electromagnetic relay provided with the contact apparatus in the same as the above is shown. Sectional drawing of the contact apparatus in Embodiment 2 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 cross-sectional schematic of the contact apparatus in Embodiment 3 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 enlarged view 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 FIGS. 1 and 2, 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 body). , Second and third yokes) 63, 64, 47 and a pair of permanent magnets 46.

  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 (first yoke) 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 (third yoke) 64 is substantially U-shaped from a base plate 641 having a substantially rectangular plate shape and a pair of extending walls 642 respectively extending upward from both front and rear ends of the base plate 641. Formed. Then, as shown in FIG. 2B, the yoke body 64 has the movable contactor in a state where the narrow part 351 of the movable contactor 35 is fitted in the recess 64 b formed between the pair of extending walls 642. 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. Specifically, the pair of permanent magnets 46 are both magnetized along the front-rear direction, the front surface is N-pole and the rear surface is S-pole, and the rear surface (S-phase) of the front permanent magnet 46 and the rear Of the permanent magnets 46 are opposed to each other.

  The second yoke 47 is provided to face each end face in the longitudinal (left / right) direction of the movable contact 35 and connects the pair of permanent magnets 46. Here, the first yoke 47 extends from the both ends of the base portion 47a facing the longitudinal end surface of the movable contact 35 and the base portion 47a substantially perpendicularly to the base portion 47a. Are formed in a substantially U-shape from a pair of extending portions 47b connected to each other. The first (left) first yoke 47 connects the north poles of the pair of permanent magnets 46, and the other (right) permanent magnet 46 connects the south poles of the pair of permanent magnets 46. That is, the left first yoke 47 connects the front surfaces (N pole surfaces) of the pair of permanent magnets 46, and the right first yoke 47 connects the rear surfaces (S pole surfaces) of the pair of permanent magnets 46. ) Are connected. As a result, the pair of permanent magnets 46 and the pair of yoke bodies 47 form a magnetic flux from the left yoke body 47 to the right yoke body 47 around the contact block 3 as shown in FIG.

  In the contact device of this 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. As shown in FIG. 4, 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. More specifically, in FIG. 3, when a 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. 3, 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, 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 yoke body 47. Therefore, the magnetic flux between the pair of yoke bodies 47 is attracted to the yoke body 47 located at the approximate center of each contact portion, and the magnetic flux density around each contact portion is increased, and the arc interruption performance at the contact portion is further enhanced. Become. Therefore, even if the size of the permanent magnet 46 is reduced, the force for extending the arc can be maintained, so that further reduction in the size and cost of the contact device can be achieved while maintaining the arc breaking performance. In the present embodiment, the polarities of the opposed surfaces of the pair of permanent magnets 46 are different from each other, but the polarities of the opposed surfaces of the pair of permanent magnets 46 are the same as shown in FIG. There may be.

  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 shown in FIG. 18, it is necessary to assemble the movable contact 35, the first and second yokes 74 and 76, and the contact pressure spring 71 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.

  And the contact device of the said embodiment is used for an electromagnetic relay as shown in FIG. 8, for example.

  The electromagnetic relay includes a drive unit 8 having an electromagnet block 2, a contact block 3, yoke bodies 47, 63, 64, and a pair of permanent magnets 46 shown in FIG. 7 in a case 4 shown in FIG. 9. And store. Hereinafter, the vertical and horizontal directions in FIG. 7A are used as a reference, and the direction orthogonal to the vertical and horizontal directions is the front and rear direction.

  As shown in FIGS. 7 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 the contact device of this embodiment, the yoke body 63 is formed in a substantially 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.

  The yoke bodies 63 and 64 are both formed in a substantially U-shaped cross section, and when the contact is inserted, the gap between the lower end surface of the yoke body 63 and the upper end surface of the yoke body 64 is the front end surface of the movable contact 35, and You may make it each oppose a rear-end surface. In this case, the leakage magnetic flux in the gap is suppressed, the magnetic attractive force generated between the yoke bodies 63 and 64 can be further increased, and the decrease in the contact pressure between the contacts can be more reliably prevented.

  Further, in the contact device of the present embodiment, the substantially disc-shaped protrusion 64a is formed on the lower surface of the yoke body 64. Instead of forming the protrusion 64a, an annular groove is formed, The upper end of the contact pressure spring 36 may be fitted into the groove.

(Embodiment 2)
The contact device of this embodiment is demonstrated using FIGS. In the following, description will be made with reference to the vertical and horizontal directions in FIG.

  As shown in FIGS. 10 and 11, 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 1. Since other configurations are the same as those in the first 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. 12A, the movable contact 37 is restricted from moving upward by the bottom surface of the concave portion 37 b coming into contact with 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. 13, when the movable contact 34 comes into contact with the fixed contact 32 and the contacts become conductive, 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. 14, 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 attraction 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. 13B, after the contact is made conductive, 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 larger 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 this embodiment, as shown in FIG. 15, 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 3)
The contact device of this embodiment is demonstrated using FIG. In addition, the contact device of this embodiment is a contact device described in the first or second embodiment, 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 48 is provided in the contact device of Embodiment 1 or 2, since the same effect can be obtained, in this actual embodiment, the permanent magnet piece 48 is added to the contact device of Embodiment 1. A description will be given of the case where the is provided.

  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, for example, the permanent magnet piece 48 is provided instead of the restricting portion 813, and enters the concave portion 63a when the contact portion is conducted.

  The permanent magnet piece 48 is disposed so that the left end polarity is the S pole and the right end polarity is the N pole. The permanent magnet piece 48 is directed from the left second yoke 47 to the right second yoke 47. The magnetic flux is attracted to the permanent magnet piece 48. That is, a magnetic path is formed together with the pair of permanent magnets 46 and the second yoke 47.

  Therefore, in the contact device of the present embodiment, the provision of the permanent magnet piece 48 suppresses the leakage magnetic flux between the pair of permanent magnets 46 and improves the magnetic flux density near each contact portion. 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 (16)

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;
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 holding means for holding the contact pressure spring, a movable shaft connected to the holding body, and a driving means comprising an electromagnet block for driving the movable shaft so that the movable contact contacts and separates from the fixed contact;
A fixing member that does not move by the driving means;
A pair of magnets arranged opposite to each other through the contact block in the direction in which the movable contacts are arranged side by side and in the direction perpendicular to the contact / separation direction of the movable contact and the fixed contact, and magnetized along the facing direction. With permanent magnets,
A first yoke fixed to the fixed member between the pair of permanent magnets and facing one surface of the movable contact;
A second yoke fixed to the movable contact and facing the first yoke;
A pair of third yokes provided to face each end face of the movable contact in the direction in which the movable contacts are arranged;
One of the pair of third yokes is connected between N poles of the pair of permanent magnets, and the other is connected between S poles of the pair of permanent magnets.   The contact device according to claim 1, wherein the fixed member is a container that houses the movable contact. The movable contact is formed in a flat plate shape,
3. The contact device according to claim 1, wherein the first yoke is formed with a recess capable of accommodating the restricting portion at a position facing the restricting portion.   The contact device according to claim 1, wherein the movable contact is formed with a recess for accommodating the restricting portion on one surface. The movable contact is formed with a first recess for accommodating the regulating portion on one surface,
3. The contact device according to claim 1, wherein the first yoke is formed with a second recess capable of accommodating the restricting portion at a position facing the first recess.   6. The contact device according to claim 1, wherein the first yoke is formed in a flat plate shape.   7. The contact device according to claim 1, wherein at least one of the first and second yokes 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 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 1, wherein the contact device is formed in a substantially U-shaped cross section.   9. 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. 9. The contact device according to 9.   The contact device according to claim 1, wherein the first yoke is formed thicker in the axial direction of the movable shaft than the second yoke.   Between the pair of permanent magnets, it is arranged to face one surface of the movable contact, and in the first direction, the polarity on one side is set to be different from the polarity on one side of the permanent magnet, and the other side The contact device according to claim 1, further comprising a permanent magnet piece whose polarity is set to be different from the polarity on the other side of the permanent magnet.   13. The groove according to claim 1, wherein a groove portion into which one end of the contact pressure spring is fitted is formed on a surface of the second yoke opposite to a surface that contacts the movable contact. Contact device.   13. The projecting portion that fits into one end of the contact pressure spring is formed on a surface of the second yoke opposite to a surface that contacts the movable contact. 13. Contact device.   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 separately.

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