JP5768223B2 - Contact device - Google Patents

Description

  The present invention relates to a contact device.

  Conventionally, in contact devices used for electromagnetic relays, switches, timers, etc., a magnetic blow structure that extinguishes the arc current generated when the contacts come in and out by the force of a permanent magnet arranged in the vicinity of the contacts. What you have is provided.

  As an example of the contact device having the magnetic blow structure, as shown in FIG. 27, a movable contactor including a pair of fixed terminals 81 having a fixed contact 811 and a pair of movable contacts 821 contacting and separating from the pair of fixed contacts 811 respectively. One having a contact block 8 composed of 82, a drive block (not shown) for driving the movable contact 82, and a permanent magnet 9 disposed in the vicinity of the contact block 8 is known (see, for example, Patent Document 1). .

  The movable contact 82 is formed in a substantially rectangular plate shape, and a pair of movable contacts 821 are arranged in parallel along the longitudinal direction. Then, the movable contact 82 is moved to the fixed terminal 81 side by the drive block, so that the pair of movable contacts 821 abut against the pair of fixed contacts 811.

  Further, the permanent magnet 9 is disposed so as to be opposed to one side and the other side of the movable contact 82 in the short direction via the contact block 8. Here, the pair of permanent magnets 9 that face each other via the contact block 8 are arranged in the vicinity of the contact pair for each contact pair of one fixed contact 811 and one movable contact 821 that contacts and separates from the fixed contact 811. Is done. That is, two pairs of permanent magnets 9 are provided.

  The pair of permanent magnets 9 are disposed so that the polarities of the surfaces facing each other are different. For example, the permanent magnets disposed on one side in the short direction (upper side in FIG. 27) of the movable contact 82 are provided with the N pole side facing the contact block, and the other side in the short direction of the movable contact 82. The permanent magnets 9 respectively disposed on the lower side of FIG. 27 are provided so that the S pole side faces the contact block 8. That is, the two permanent magnets 9 disposed on one side of the movable contact 82 in the short direction have the same polarity of the surfaces facing the movable contact 9 and are disposed on the other side in the short direction. The polarities of the surfaces facing the movable contact 82 are also equal for the two movable contacts 82. Thereby, the magnetic field in a contact part is strengthened.

  And when an electric current flows from the one side of the longitudinal direction in the movable contact 82 to the other side (the left side to the right side of FIG. 27), the arc currents generated when the contact pair contacts and separates are stretched away from each other. That is, the arc current generated on one side in the longitudinal direction of the movable contact 82 (left side in FIG. 27) is stretched to the one side and generated on the other side in the longitudinal direction of the movable contact 82 (right side in FIG. 27). The arc current is stretched to the other side.

  However, when the direction in which the current flows is opposite to the above direction (from the right side to the left side), the arc currents generated at each contact pair are stretched in a direction approaching each other. Therefore, when a current in the reverse direction such as a regenerative current flows through the contact device, there is a possibility that arc currents generated at each contact pair come into contact with each other and short-circuit.

  Therefore, as shown in FIG. 28, there is provided a structure in which a pair of permanent magnets 9 that are opposed to each other via the contact block 8 are arranged in the longitudinal direction of the movable contact 82 (see, for example, Patent Document 2).

  In the contact device shown in Patent Document 2, the polarities of the surfaces facing each other in the pair of permanent magnets 9 are the same, and the distribution of magnetic flux formed around is symmetrical between one contact pair and the other contact pair. And even if the direction of the electric current which flows into the movable contact 82 is any direction of the longitudinal direction in the said movable contact 82, the arc electric current which generate | occur | produces in each contact pair is extended in the direction away from each other.

Japanese Patent No. 3321963 JP 2008-226547 A

  However, in the contact device shown in Patent Document 2, a pair of permanent magnets 9 facing each end face of the movable contact 82 in the direction in which the movable contacts 821 are arranged are respectively disposed. There has been a problem that the apparatus becomes large.

  The present invention has been made in view of the above-described reasons, and an object of the present invention is to provide a contact device that can obtain stable arc breaking performance and is downsized.

In order to solve the above-mentioned problem, a first invention is a contact comprising a pair of fixed terminals having a fixed contact, and a movable contact in which a pair of movable contacts respectively contacting and separating from the pair of fixed contacts are arranged side by side. A block, drive means for driving the movable contact so that the movable contact comes into contact with and away from the fixed contact, a direction in which the movable contacts are arranged in parallel, and a direction in which the movable contact and the fixed contact are separated from each other A pair of permanent magnets provided opposite to each other in the direction and having the same polarity on the surfaces facing each other, and the pair of permanent magnets disposed between the pair of permanent magnets. A second yoke opposed to each other, and the driving means abuts against one surface of the movable contact so as to restrict the movement of the movable contact toward the fixed contact, and the contact Joint is connected That the movable shaft comprises an electromagnet block the movable contact to drive the movable shaft toward and away from said fixed contact, said second yoke also serves as the contact portion, the movable shaft It characterized that you are formed integrally with.

  According to a second invention, in the first invention, a first yoke for connecting the pair of permanent magnets is provided opposite to an end face of the movable contact in a direction in which the movable contacts are arranged. .

According to a third invention, in the first or second invention, the second yoke is provided to face one surface of the movable contact.

  According to a fourth invention, in any one of the first to third inventions, the movable contact is arranged closer to one of a pair of permanent magnets.

  According to a fifth invention, in any one of the first to fourth inventions, the pair of permanent magnets is formed such that any one of the thicknesses is thicker than the other.

According to a sixth aspect, in the first to fifth one aspect, the drive means comprises a pressure spring for urging the movable contact to the fixed contact side, the movable contact comprising said contact portion And a restricting means for restricting movement of the child to the fixed contact side, wherein the restricting means is connected to the movable shaft .

  According to a seventh invention, in any one of the third to sixth inventions, there is provided a third yoke that contacts the other surface of the movable contact and faces the second yoke through the movable contact. It is characterized by that.

An eighth invention is the sixth or seventh invention, wherein the movable shaft includes a shaft portion that is movably inserted in an insertion hole formed in the movable contact , and the contact portion is the shaft portion. It is provided in the end of this.

According to a ninth invention, in any one of the first to eighth inventions, the contact block is housed in a container, and the second yoke is configured such that at least a part of the outer periphery contacts the inner wall of the container. Features.

According to a tenth aspect of the present invention, in any one of the seventh to ninth aspects, the contact block is housed in a container, and the second and third yokes each have at least a part of the outer periphery on the inner wall of the container. It contacts, It is characterized by the above-mentioned.

An eleventh invention is characterized in that, in any one of the first to sixth inventions, the second yoke is formed in a flat plate shape.

According to a twelfth invention, in any one of the seventh to tenth inventions , at least one of the second and third yokes is formed in a flat plate shape.

In a thirteenth aspect based on any one of the first to sixth aspects, the second yoke extends from the end of the base portion facing the movable contact toward the movable contact. It is characterized by being formed in a substantially U-shaped cross section from a pair of extending portions provided.

In a fourteenth aspect based on any one of the seventh to the tenth aspects, the second or third yoke includes at least one of a flat base portion facing the movable contact and an end portion of the base portion. It is characterized by being formed in a substantially U-shaped cross section from a pair of extending portions extending toward the movable contact side.

A fifteenth invention is characterized in that, in any one of the seventh to fourteenth inventions, the second yoke is formed thicker than the third yoke in the axial direction of the movable shaft. To do.

In a sixteenth aspect based on any one of the thirteenth to fifteenth aspects, the gap between the second and third yokes is such that the movable contact is at least when the movable contact and the fixed contact abut. It faces the side end of the child.

According to a seventeenth aspect, in any one of the second to sixteenth aspects, 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, A polarity of the second surface facing the pair of first yokes is set to be different from the polarity of the first surface, and a permanent magnet piece is provided between the pair of permanent magnets. Features.

In an eighteenth aspect based on any one of the seventh to seventeenth aspects, the third 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. It is formed.

According to a nineteenth aspect of the present invention, in any one of the seventh to seventeenth aspects, the third yoke is a protrusion that fits into one end of the contact pressure spring on a surface opposite to a surface that contacts the movable contact. Is formed.

According to a twentieth aspect of the invention, in any one of the first to nineteenth aspects, the fixed contact is provided integrally with the fixed terminal or separately.

According to a twenty-first aspect, in any one of the first to twentieth aspects, the movable contact is provided integrally or separately from the movable contact.

  As described above, according to the present invention, it is possible to obtain a stable arc interrupting performance and to provide a contact device that is downsized.

1 is a schematic perspective view of a contact device according to Embodiment 1 of the present invention. The principal part enlarged view of the contact apparatus in the same as the above is shown. The principal part enlarged view at the time of providing the 1st yoke in the contact apparatus in the same as the above is shown. The principal part enlarged view in another form of the contact device in the same as the above is shown. The schematic side view 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 sectional drawing of the electromagnetic relay provided with the contact apparatus in the same as the above is shown. The principal part enlarged view of the contact apparatus in Embodiment 2 of this invention is shown. The schematic perspective view of the contact apparatus in Embodiment 3 of this invention is shown. The schematic side view of the contact apparatus in the same as the above is shown. The schematic perspective view of the contact apparatus in Embodiment 4 of this invention is shown. The schematic side view of the contact apparatus in the same as the above is shown. The schematic perspective view of the contact apparatus in Embodiment 5 of this invention is shown. The schematic side view of the contact apparatus in the same as the above is shown. The schematic perspective view of the contact apparatus in Embodiment 6 of this invention is shown. The schematic side view of the contact apparatus in the same as the above is shown. The schematic perspective view of the contact apparatus in Embodiment 7 of this invention is shown. The schematic side view of the contact apparatus in the same as the above is shown. The schematic of the contact device in Embodiment 8 of the present invention is shown. The sectional side view of the contact device in the same as above is shown. The principal part enlarged view of the contact apparatus in the same as the above is shown. The schematic of the magnetic path which generate | occur | produces in 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 the contact apparatus in Embodiment 9 of this invention is shown. The top view of the 1st contact device in a prior art example is shown. Sectional drawing of the 2nd 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 the present embodiment will be described with reference to FIGS. Note that the description will be made with reference to the vertical and horizontal directions in FIG.

  The contact device of the present embodiment includes a fixed terminal 33 having a fixed contact 32, a movable contact 35 having a movable contact 34 contacting and separating from the fixed contact 32, and a contact for urging the movable contact 35 toward the fixed contact 32. A movable contact shaft 3 comprising a pressure spring 36, a movable shaft 5 that movably passes through an insertion hole 35a formed in the movable contact 35 and restricts the movement of the movable contact 35 toward the fixed contact 32, and a movable The driving means is composed of an electromagnet block 2 for driving the movable shaft 5 so that the contact 34 contacts and separates from the fixed contact 32, and a permanent magnet 46 for extinguishing the arc generated in the contact block 3 in a short time. There are known contact devices.

  The movable contact 35 is formed in a substantially rectangular flat plate shape, and movable contacts 34 are respectively fixed to both ends of the upper surface in the longitudinal direction (left and right direction), and an insertion hole 35a is formed in the approximate center. The lower surface of the movable contact 35 is pressed by the contact pressure spring 36.

  The movable shaft 5 is movably inserted through the insertion hole 35 a in the movable contact 35, and is provided at the upper end of the shaft portion 51 so as to come into contact with the upper surface of the movable contact 35 to fix the movable contact 35. It is comprised from the rectangular contact part 52 which controls the movement to the contact 32 side.

  Since the contact part 52 is formed of a magnetic material such as soft iron, it has both the function of the contact part and the function of the yoke. Hereinafter, the contact portion 52 is referred to as a yoke contact portion 52.

  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. In the permanent magnet 46, the polarities of the surfaces facing each other are the same (N pole in this embodiment). That is, the front permanent magnet 46 is provided so that the front surface is an S pole and the rear surface is an N pole, and the rear permanent magnet 46 is provided such that the front surface is an N pole and the rear surface is an S pole.

  In the contact device of this embodiment, when the movable shaft 37 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 37. It moves to the fixed contact 32 side by the urging force. As a result, the movable contact 34 comes into contact with the fixed contact 32 and the contacts are conducted.

Here, as shown in FIG. 2, a magnetic field is formed around the contact block 3 by the pair of permanent magnets 46. For this reason, the arc generated between the fixed contact 32 and the movable contact 34 (between the contacts) is stretched away from each other and extinguished regardless of the direction of the current flowing through the movable contact 35. The Specifically, in FIG. 2, when current flows from the left to the right through the movable contact 35, the arc generated between the left contact points is stretched left rearward, and the arc generated between the right contact points is stretched right rearward. This can prevent a short circuit of the arc current. In FIG. 2, when the current flows from the right to the left through the movable contact 35, the arc generated between the left contact points is stretched to the left front, and the arc generated between the right contact points is stretched to the right front. Short circuit of arc current can be prevented.
In addition, the number 31 in FIG. 2 shows the sealing container 31 mentioned later.

  The permanent magnet 46 has a length L1 that is longer than the distance L2 between the pair of fixed contacts 32, and passes through the centers of the opposing surfaces of the pair of permanent magnets 46 so as to intersect each permanent magnet 46 perpendicularly. The line X is disposed so as to pass through the midpoint O between the pair of fixed contacts 32. Therefore, a symmetrical magnetic field with the center line X as the target axis is formed around each of the left and right contact points, and arcs generated between the left and right contact points are stretched by receiving equal force from the magnetic field. . Therefore, contact wear at the left and right contacts is substantially equal, and stable opening / closing performance of the contacts can be obtained.

  Furthermore, as shown in FIG. 3, a first 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 first yoke 47 extends from the both ends of the base 47a facing the end face in the longitudinal direction of the movable contact 35 and substantially perpendicular to the base 47a and is connected to the pair of permanent magnets 46, respectively. It is formed in a substantially U shape from a pair of extending portions 47b. Here, the pair of extending portions 47 b are connected to the surfaces on the south pole side of the pair of permanent magnets 46. That is, one extending portion 47 b is connected to the front surface of the front permanent magnet 46, and the other extending portion 47 b is connected to the rear surface of the rear permanent magnet 46.

  As a result, the magnetic flux emitted from the pair of permanent magnets 46 is attracted to the first yoke 47, the leakage magnetic flux is suppressed, the magnetic flux density in the vicinity of the contact can be improved, and the force to stretch the arc generated between the contacts is increased. Increase. Accordingly, the provision of the first yoke 47 can maintain the force for extending the arc even if the size of the permanent magnet 46 is reduced, so that the contact device can be reduced in size and cost while maintaining the arc interruption performance. be able to.

As shown in FIG. 4, a yoke contact portion 52 is provided between the pair of permanent magnets 46 and is disposed substantially parallel to the pair of permanent magnets 46 and contacts the upper surface of the movable contact 35. That is, the yoke contact portion 52 is disposed in the magnetic flux generated by the pair of permanent magnets 46, and part of the magnetic flux enters the yoke contact portion 52 perpendicularly. Here, the magnetic fluxes incident from the front surface and the rear surface of the yoke contact portion 52 repel each other at the approximate center of the yoke contact portion 52 and are emitted from the left and right side surfaces of the yoke contact portion 52, respectively. Follow the street towards the first yoke 47. Accordingly, the number of magnetic fluxes passing through the vicinity of the contact portion is increased by the yoke contact portion 52, and the force for extending the arc current is increased, so that the arc breaking performance can be improved. That is, the yoke contact portion 52 can efficiently guide the magnetic flux generated between the pair of permanent magnets 46 to the vicinity of the contact portion.

  Further, as shown in FIG. 5A, when a current flows through a conductor (contactor 35) that is generally not provided with a yoke in the vicinity, a magnetic flux is generated concentrically with the center of the conductor as the center of the magnetic field. . Therefore, in FIG. 5A, the number of magnetic fluxes from right to left in the conductor and the number of magnetic fluxes from left to right in the conductor are substantially equal, and no electromagnetic force is generated in the conductor.

  However, in the contact device of the present embodiment, when the contacts are brought into conduction, as shown in FIG. 5B, the movable contact 35 is affected by the yoke contact portion 52 close to the upper surface of the movable contact 35. The balance of the magnetic field generated around the child 35 is lost. More specifically, in FIG. 5B, most of the magnetic flux from the right to the left is attracted to the yoke contact portion 52, and the yoke is brought close to the movable contact 35 as shown in FIG. Compared with the case where it is not provided, the number of magnetic fluxes from the right to the left in the movable contact 35 decreases. Hereinafter, the yoke contact portion 52 is referred to as a second yoke 52.

  On the other hand, in FIG. 5B, the magnetic flux from the left to the right moves upward as a whole, as compared with the case where the yoke is not provided near the movable contact 35 as shown in FIG. Thus, the number of magnetic fluxes from the left to the right in the movable contact 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. It becomes larger than the downward electromagnetic force, and an upward electromagnetic force (attraction force) acts on the movable contact 35. That is, the movable contact 35 is subjected to a suction force toward the fixed contact that is substantially parallel (vertically upward) to the displacement direction of the movable contact 35.

  Here, since the vertically upward suction 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, the contact repulsive force is It is the force that works in the direction of the most efficient cancellation. Therefore, the contact repulsive force can be effectively canceled by the suction force, and the decrease in the contact pressure between the contacts can be reduced.

  Therefore, in the contact device of the present embodiment, contact wear at the left and right contacts is substantially equal due to the provision of the pair of permanent magnets 46, and the second yoke 52 attracts the movable contact 35 toward the fixed contact. Thus, the contact device of the present embodiment has a stable arc breaking performance while improving the resistance to electromagnetic repulsion when a load is short-circuited, and can obtain a more stable contact switching performance.

  In the present embodiment, the second yoke 52 functions as both a yoke and a contact portion, and the second yoke 52 and the shaft portion 51 are integrally molded to constitute the movable shaft 5. Is done. Therefore, one component (movable shaft 5) can function as a yoke, a contact portion, and a shaft portion, thereby reducing the number of components.

  In the present embodiment, the second yoke 52 and the shaft portion 51 are integrally molded. However, after the second yoke 52 and the shaft portion 51 are separately molded, the shaft portion is formed on the second yoke 52. It may be formed integrally by inserting 51 or the like.

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

  As shown in FIGS. 6 (a), (b), 7 (a), (b), and FIGS. 8 (a) to (c), the electromagnetic relay includes an electromagnetic block in a hollow box type case 4. The inner block 1 configured by integrally combining the contact block 2 and the contact block 3, the permanent magnet 46, and the first yoke 47 are accommodated. Hereinafter, with reference to the vertical and horizontal directions in FIG.

  The electromagnet block 2 is formed of an insulating material and is fixed to a hollow cylindrical coil bobbin 21 around which the excitation winding 22 is wound, a coil terminal 23 connected to both ends of the excitation winding 22, and the coil bobbin 21 in the cylinder. The fixed iron core 24 magnetized by the energized excitation winding 22 and the fixed iron core 24 are arranged in the cylinder of the coil bobbin 21 so as to oppose each other in the axial direction of the coil bobbin 21 and according to whether the energization winding 22 is turned on or off. A movable iron core 25 that is attracted to the fixed iron core 24 and moves in the axial direction of the coil bobbin 21, a yoke 26 made of a magnetic material and surrounding the coil bobbin 21, and a movable iron core disposed in the cylinder of the coil bobbin 21. A return spring 27 that biases 25 downward is provided.

  The contact block 3 includes a sealing container 31 formed in a hollow box shape whose bottom surface is opened from an insulating material, and is formed in a substantially columnar shape and penetrates the top surface of the sealing container 31 so that the fixed contact 32 is provided on the bottom surface. A fixed terminal 33 provided with a movable contact 34 having a movable contact 34 that contacts and separates from the fixed contact 32, and a movable contact 35 that is in contact with the lower surface of the movable contact 35. A contact pressure spring 36 for urging 35 toward the fixed contact 33 is provided.

  The coil bobbin 21 is formed of a resin material in a hollow cylindrical shape having flanges 21a and 21b formed at the upper and lower ends, and an excitation winding 22 is wound around the outer periphery of the cylindrical portion 21c. The inner diameter on the lower end side of the cylindrical portion 21c is larger than the inner diameter on the upper end side.

  As shown in FIG. 8C, the excitation winding 22 is connected to a pair of terminal portions 121 provided on the flange portion 21 a of the coil bobbin 21, and ends thereof are connected via lead wires 122 connected to the terminal portions 121. A pair of coil terminals 23 are connected to each other.

  The coil terminal 23 is formed of a conductive material such as copper, and is formed of a base portion 23a connected to the lead wire 122 by solder or the like, and a terminal portion 23b extending substantially vertically from the base portion 23a.

  As shown in FIG. 8B, the yoke 26 has a substantially rectangular plate-shaped first yoke plate 26 </ b> A disposed on the upper end side of the coil bobbin 21 and a substantially rectangular plate disposed on the lower end side of the coil bobbin 21. A plate-shaped second yoke plate 26B and a pair of third yokes 26C extending upward from the left and right ends of the second yoke plate 26B and connected to the first yoke plate 26A. Is done.

  And the recessed part 26a is formed in the upper surface side approximate center of the 1st yoke plate 26A, and the penetration hole 26c is formed in the approximate center of the said recessed part 26a. And the bottomed cylindrical cylindrical member 28 in which the collar part 28a is formed in the upper end is penetrated by the said insertion hole 26c, and the collar part 28a is joined to the recessed part 26a. Here, on the lower end side in the cylindrical portion 28b of the cylindrical member 28, the movable iron core 25 formed in a substantially columnar shape from a magnetic material is disposed, and further, the cylindrical portion 28b is formed in a substantially columnar shape from a magnetic material. The fixed iron core 24 is inserted, and the fixed iron core 24 and the movable iron core 25 are arranged to face each other.

  Further, on the upper surface of the first yoke plate 26A, a peripheral portion is fixed to the first yoke plate 26A, and a convex portion that forms a space for accommodating the flange portion 24a formed at the upper end of the fixed iron core 24 at the approximate center. A cap member 45 made of a metal provided with 45 a is provided, and the cap member 45 prevents the fixed iron core 24 from coming off.

  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, and the yoke 26 and A magnetic circuit is formed together with the fixed iron core 24 and the movable iron core 25.

  The return spring 27 is inserted through an insertion hole 24 b formed in the axial direction of the fixed iron core 24, the lower end is in contact with the upper surface of the movable iron core 25, and the upper end is in contact with the lower surface of the cap member 45. Further, the return spring 27 is provided in a compressed state between the movable iron core 25 and the cap member 45, and elastically biases the movable iron core 25 downward.

The movable shaft 5 includes a shaft portion 51 that is formed from a nonmagnetic material in the shape of a long round bar that is long in the vertical direction, and a bowl-shaped first member made of a magnetic material that is integrally formed with the shaft portion 51 at the upper end of the shaft portion 51 . And two yokes 52.

  The shaft portion 51 is inserted through the insertion hole 45 b formed at the approximate center of the convex portion 45 a of the cap member 45 and the return spring 27, and the screw portion 51 a formed at the lower end portion is formed in the axial direction of the movable core 25. The movable iron core 25 is connected by being screwed into the screw hole 25a.

The second yoke 52 is formed from soft iron into a substantially rectangular flat plate shape, and restricts the movement of the movable contact 35 toward the fixed contact. That is, the second yoke 52 has a function of a contact portion that restricts movement of the movable contact 35 and a function of the yoke .

  In the movable contact 35, the movable shaft 5 is inserted into an insertion hole 35b formed in a substantially center with the movable contact 34 fixed to the left and right ends of the main body 35a formed in a substantially rectangular shape.

  The fixed terminal 33 is formed in a substantially cylindrical shape using a conductive material such as copper, a flange 33a is formed at the upper end, and a fixed contact 32 facing the movable contact 34 is fixed to the lower surface. A screw hole 33b is formed in the axial direction from the upper surface of the fixed terminal 33, and a screw portion such as an external load (not shown) is screwed into the screw hole 33b to be connected.

  The sealing container 31 is formed in a hollow box shape whose bottom surface is opened from a heat-resistant material such as ceramic, and two through holes 31a through which the fixed terminal 33 penetrates are arranged in parallel on the top surface. And the fixed contact terminal 33 is penetrated by the through-hole 31a in the state which made the collar part 33a protruded from the upper surface of the sealing container 31, and is joined by brazing. Moreover, as shown to Fig.8 (a), the end of the flange 38 is joined to the opening periphery of the sealing container 31 by brazing. The sealed container 31 is sealed by joining the other end of the flange 38 to the first yoke plate 26A by brazing.

  Furthermore, an insulating member 39 for insulating an arc generated between the fixed contact 32 and the movable contact 34 from the joint between the sealing container 31 and the flange 38 is provided at the opening of the sealing container 31. ing.

  The insulating member 39 is formed in a substantially hollow rectangular parallelepiped shape having an upper surface opened from an insulating material such as ceramic or synthetic resin, and a convex portion 45a of the cap member 45 is formed in a concave portion in a rectangular frame 39a formed at the substantially center of the lower surface. Mated. Further, since the upper end side of the peripheral wall of the insulating member 39 is in contact with the inner surface of the peripheral wall of the sealing container 31, it is possible to join the sealing container 31 and the flange part 38 from the contact part including the fixed contact 32 and the movable contact 34. Insulating parts.

  Further, a circular frame 39c having an inner diameter substantially the same size as the inner diameter of the contact pressure spring 36 is formed at the approximate center of the inner bottom surface of the insulating member 39, and the movable shaft 5 is inserted through the approximate center of the circular frame 39c. An insertion hole 39b is formed. And the displacement of the contact pressure spring 36 is prevented by fitting the lower end portion of the contact pressure spring 36 through which the movable shaft 5 is inserted into the recess in the circular frame 39c.

  In addition, the contact spring 36 is provided in a compressed state between the insulating member 39 and the movable contact 35 with its upper end abutting against the lower surface of the movable contact 35, so that the movable contact 35 is placed on the fixed contact 32 side. It is elastically biased to the back.

  The permanent magnet 46 is formed in a substantially rectangular parallelepiped shape, and is disposed in contact with the sealing container on the front side and the rear side of the sealing container 31, respectively. The pair of permanent magnets 46 are provided so as to face each other with the sealing container 31 therebetween, and the polarities of the faces facing each other are the same (N pole in this embodiment). Here, the pair of permanent magnets 46 oppose each other via a contact gap between the fixed contact 32 and the movable contact 34 in the sealing container 31.

  The first yoke 47 is substantially U-shaped from a substantially rectangular plate-like base portion 47a and a pair of extending portions 47b extending substantially perpendicularly to the base portion 47a from both front and rear ends of the base portion 47a. Formed on the left and right side surfaces of the sealing container 31. The base 47a is provided in contact with the left and right side surfaces of the sealing container 31, and the pair of extending portions 47b sandwich the permanent magnet 46 and the sealing container 31 from the front-rear direction. That is, of the pair of extending portions 47 b, one extending portion 47 b contacts the front surface (S pole surface) of the front permanent magnet 46, and the other extending portion 47 b is the rear surface of the rear permanent magnet 46. (S pole surface) is in contact.

  The case 4 is formed of a resin material in a substantially rectangular box shape, and includes a hollow box-type case main body 41 having an upper surface opened, and a hollow box-type cover 42 covering the opening of the case main body 41.

  The case main body 41 is provided with a protrusion 141 formed with an insertion hole 141a used for fixing the electromagnetic relay to the mounting surface by screwing at the front ends of the left and right side walls. Further, a step portion 41 a is formed at the opening periphery of the upper end side of the case 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 surface above the step portion 41a. Further, a pair of concave portions 41c are arranged in the left-right direction on the rear surface above the step portion 41a.

  The cover 42 is formed in a hollow box shape with an open bottom surface, and a pair of protrusions 42 a that fit into the recesses 41 c of the case body 41 when assembled to the case body 41 are formed on the rear surface. A partition 42c is formed on the upper surface of the cover 42 to divide the upper surface into two substantially right and left, and a pair of insertion holes 42b through which the fixed terminals 33 are inserted are formed on the upper surface divided into two by the partition 42c. It is formed.

  As shown in FIG. 8 (c), when the inner unit block 1 including the electromagnet block 2 and the contact block 3 is stored in the case 4, the flange 21 b at the lower end of the coil bobbin 21 and the bottom surface of the case main body 41 A substantially rectangular lower cushion rubber 43 is interposed between the upper cushion rubber 44 and an insertion hole 44a through which the flange 33a of the fixed terminal 33 is inserted between the sealing container 31 and the cover 42. Disguise.

In the electromagnetic relay, since the return spring 27 has a higher spring coefficient than the contact pressure spring 36, the movable iron core 25 slides downward due to the urging force of the return spring 27, and the movable shaft 5 also moves downward. Move to. As a result, the movable contact 35 moves downward as the second yoke 52 of the movable shaft 5 moves, so that the movable contact 34 is provided in a state of being separated from the fixed contact 32 in the initial state.

When the exciting winding 22 is energized, the movable iron core 25 is attracted to the fixed iron core 24 and slides upward, so that the movable shaft 5 connected to the movable iron core 25 also moves upward in conjunction with it. As a result, the second yoke 52 of the movable shaft 5 moves to the fixed contact 32 side, and the movable contact 35 also moves to the fixed contact 32 side by the biasing force of the contact pressure spring 36, so that it is fixed to the movable contact 35. The moved movable contact 34 comes into contact with the fixed contact 32 so that the contacts are electrically connected.

  Since the electromagnetic relay having the above configuration includes the contact device, it has stable contact opening / closing performance and can be reduced in size and cost.

  In general, the electromagnetic relay has a longitudinal dimension determined by the size of the coil bobbin 21 provided in the electromagnet block 2, and the lateral dimension is a movable contact 35 in which the movable contacts 34 are arranged in parallel along the longitudinal direction. It is determined by the dimension in the longitudinal direction (left and right direction).

  More specifically, the coil bobbin 21 has a cylindrical shape in which flanges 21 a and 21 b are formed at both upper and lower ends, and the inner dimension of the case 4 in the front-rear direction is set according to the outer shape of the coil bobbin 21. Here, since the movable contact 35 has a short direction in the front-rear direction, the electromagnet block 2 appears to protrude from both sides of the movable contact 35 in the front-rear direction when viewed from above. That is, a dead space exists between the movable contact 35 and the inner wall of the case 4 in the front-rear direction.

  Accordingly, when the pair of permanent magnets 46 are disposed on both sides of the movable contact 35 in the left-right direction, it is necessary to further increase the size of the case 4 in the left-right direction. However, in this embodiment, since the pair of permanent magnets 46 are disposed on both sides in the front-rear direction of the movable contact 35, the dead space in the case 4 can be effectively used, and the case 4 can be prevented from being enlarged. can do.

  Here, in the electromagnetic relay, the second yoke 52 of the movable shaft 5 comes close to the upper surface of the movable contact 35 when the contacts are conducted. Then, as described with reference to FIG. 5B, the balance of the magnetic field generated around the movable contact 35 is lost, and the movable contact 35 has a vertically upward direction substantially parallel to the displacement direction of the movable contact 35. The suction force works.

  Therefore, even when a contact repulsive force is applied between the contacts, the movable contact 35 has a suction force in a direction opposite to the contact repulsive force by 180 degrees. Therefore, the contact repulsive force can be canceled out efficiently, and problems such as a decrease in contact pressure and contact welding due to an arc during contact opening can be prevented.

  Further, since the second yoke 52 is formed in a substantially flat plate shape, the distance from each point on the surface of the second yoke 52 facing the movable contact 35 to the movable contact 35 becomes substantially constant. The suction force acting on the movable contact 35 can be made substantially uniform.

When the energization of the excitation winding 22 is turned off, the movable iron core 25 slides downward by the urging force of the return spring 27, and the movable shaft 5 also moves downward accordingly. Therefore, since the second yoke 52 moves downward and the movable contact 35 also moves downward, the fixed contact 32 and the movable contact 34 are separated from each other, and the contacts are blocked.

As shown in FIG. 9, the second yoke 52 is provided with its front end and rear end in contact with the inner wall of the case 4, so that it receives a rotational force in the winding direction of the contact pressure spring 36. Even in such a case, rotation is prevented without providing additional parts. Here, in the present embodiment, the front and rear ends of the second yoke 52 is in contact with the inner wall of the case 4, the second with only a portion of the second yoke 52 are in contact with the inner wall of the case 4 The yoke 52 may be prevented from rotating.

  In the present embodiment, the contact portion 52 is made of soft iron and is used as a yoke contact portion having both functions of the contact portion and the yoke. A yoke may be provided separately from a nonmagnetic material. In that case, the yoke is provided substantially at the center of the pair of fixed terminals 33 and substantially opposite to the axis of the movable shaft.

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

(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 from each other only in the arrangement of the movable contact 35 with respect to the pair of permanent magnets 46 and the thickness of the pair of permanent magnets 46, and the structure common to the first embodiment. About these, a common code | symbol is attached | subjected and description is abbreviate | 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 the present embodiment, the thickness of the front permanent magnet 46 is made thinner than the thickness of the rear permanent magnet 46. Therefore, the strength of the magnetic field on the rear side of the movable contact 35 generated by the rear permanent magnet 46 is higher than the strength of the magnetic field on the front side of the movable contact 35 generated by the front permanent magnet 46. Accordingly, the force for extending the arc current to the rear side becomes strong, 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 is arranged near the rear permanent magnet 46 from the center between the pair of permanent magnets 46, and the thickness of the rear permanent magnet 46 is made thinner than the thickness of the front permanent magnet 46. That's fine.

  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 FIG. The contact device according to the present embodiment and the contact device according to the first embodiment are different only in the shape of the second yoke 53 of the movable shaft 5, and the structures common to the first embodiment are denoted by the same reference numerals. Description is omitted. Note that the description will be made with reference to the vertical and horizontal directions in FIG.

  As shown in FIG. 11, the second yoke 53 of the present embodiment includes a substantially rectangular flat plate-like base portion 53a and a pair of extended portions 53b extending downward from both front and rear ends of the base portion 53a. It is formed in a substantially U-shaped cross section.

When the contacts are conducted, the lower surface of the base 53a of the second yoke 53 is close to the upper surface of the movable contact 35, and the pair of extending portions 53b are the front end and the rear end of the movable contact 35, respectively. Proximity to.

  Then, as shown in FIG. 12, the balance of the magnetic field generated around the movable contact 35 is lost due to the influence of the second yoke 53 adjacent to the upper surface and the front and rear ends of the movable contact 35. More specifically, in FIG. 12, most of the magnetic flux from the right to the left in the movable contact 35 is attracted to the second yoke 53. Therefore, compared to the case where the flat plate-like second yoke 52 shown in FIG. 6B is provided in the vicinity of the movable contact 35, the number of magnetic fluxes moving from the right to the left in the movable contact 35 is smaller. Further decrease.

  On the other hand, in FIG. 12, the magnetic flux from the left to the right in the movable contact 35 moves upward as a whole, and the flat plate-like second yoke 52 shown in FIG. The number of magnetic fluxes from the left to the right in the movable contact 35 is further increased compared to the case where the magnetic flux is provided in the vicinity of.

  Then, an upward electromagnetic force acting on the movable contact 35 by the magnetic flux moving from left to right in the movable contact 35 acts on the movable contact 35 by the magnetic flux moving from right to left in the movable contact 35. It becomes even larger than the downward electromagnetic force. Therefore, a larger vertical upward electromagnetic force (suction force) acts on the movable contact 35 substantially parallel to the displacement direction of the movable contact 35.

  Here, since the vertically upward suction 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, the contact repulsive force is It is the force that works in the direction of the most efficient cancellation. Therefore, a larger upward suction force is generated in the movable contact 35 than in the first embodiment, and a decrease in the contact pressure between the contacts can be further prevented.

Therefore, in the contact device of the present embodiment, the second yoke 53 exerts a force (attraction force) that counteracts a stronger contact repulsion force than the first embodiment on the movable contact 35. That is, the contact device according to the present embodiment has a stable arc breaking performance while improving the resistance to electromagnetic repulsion when the load is short-circuited, and can obtain a more stable contact switching performance. In addition, in the present embodiment, the second yoke 53 functions as both a yoke and a contact portion, and the second yoke 53 and the shaft portion 51 are integrally formed so that the movable shaft is formed. 5 is configured. Therefore, one component (movable shaft 5) can function as a yoke, a contact portion, and a shaft portion, thereby reducing the number of components.

The second yoke 53 is a case where the pair of extending portions 53b are provided in contact with the inner wall of the case 4 so as to receive a rotational force in the winding direction of the contact pressure spring 36 or the like. However, the rotation is prevented without providing additional parts. In the present embodiment, the pair of extending portions 53b are both in contact with the inner wall of the case 4, but only one of the extending portions 53b is in contact with the inner wall of the case 4 to prevent the second yoke 53 from rotating. It may be done.

  In the present embodiment, the second yoke 53 and the shaft portion 51 are integrally molded. However, after the second yoke 53 and the shaft portion 51 are separately molded, the second yoke 53 has a shaft portion. It may be formed integrally by inserting 51 or the like.

In the present embodiment, the contact portion 53, that is formed from soft iron, have been used as a yoke abutting portions having the functions of both the contact portion and the yoke, the abutment portion 53 A yoke may be provided separately from a nonmagnetic material. In that case, the yoke is provided substantially at the center of the pair of fixed terminals 33 and substantially opposite to the axis of the movable shaft.

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

(Embodiment 4)
The contact device of this embodiment is demonstrated using FIG. However, about the structure which is common in Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted. Note that the description will be made with reference to the vertical and horizontal directions in FIG.

1 is different from the contact device of the first embodiment shown in FIG. 1 in that the lower surface of the movable contact 35 is opposed to the second yoke 52 via the movable contact 35, for example, soft iron. A yoke plate 6 made of a magnetic material such as the above (hereinafter referred to as a third yoke 6) is fixed.

  In the contact device of the present embodiment, when the movable shaft 5 is displaced upward by the driving means 2, the second yoke 52 of the movable shaft 5 is also displaced upward accordingly. Then, with the upward displacement of the second yoke 52, the restriction on the upper side of the movable contact 35 (on the fixed contact 32 side) is released, and the movable contact 35 is moved upward by the biasing force of the contact pressure spring 36. Displace. Then, when the movable contact 34 provided on the movable contact 35 abuts on the fixed contact 32, the contacts are electrically connected. At that time, the position of the second yoke 52 after the displacement is maintained by the driving means 2 and abuts or approaches the movable contact 35 held upward by the contact pressure spring 36.

  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. As shown in FIG. 14, the second yoke 52 and the third yoke 6 Is formed, and a first magnetic attraction force is generated between the second yoke 52 and the third yoke 6.

  The third yoke 6 is attracted to the second yoke 52 by the first magnetic attraction force acting between the second yoke 52 and the third yoke 6. That is, an upward force substantially parallel to the displacement direction of the movable contact 35 (pressing the movable contact 35 toward the fixed contact 32) acts on the movable contact 35 to which the third yoke 6 is fixed.

  Here, the first magnetic attraction force acting between the second yoke 52 and the third yoke 6 exerting an upward force on the movable contact 35 is a contact repulsive force (downward) generated on the movable contact 35. (Force) is a force in the opposite direction of about 180 degrees, and is therefore a force that works in the direction that cancels the contact repulsive force most efficiently. Therefore, in the contact device according to the present embodiment, the contact repulsive force can be efficiently canceled by the first magnetic attraction force, and a decrease in contact pressure between the contacts can be reduced.

  Therefore, the contact device according to the present embodiment has a stable arc breaking performance and can obtain a more stable switching performance of the contact while increasing the resistance to the electromagnetic repulsion force when the load is short-circuited.

  In the present embodiment, the second yoke 52 functions as both a yoke and a contact portion, and the second yoke 52 and the shaft portion 51 are integrally molded to constitute the movable shaft 5. Is done. Therefore, one component (movable shaft 5) can function as a yoke, a contact portion, and a shaft portion, thereby reducing the number of components.

  In the present embodiment, the second yoke 52 and the shaft portion 51 are integrally molded. However, after the second yoke 52 and the shaft portion 51 are separately molded, the shaft portion is formed on the second yoke 52. It may be formed integrally by inserting 51 or the like.

  Further, the second yoke 52 on the fixed terminal 32 side receives the magnetic flux from the fixed terminal 33 more strongly than the third yoke 6, thereby increasing the magnetic flux density. Therefore, increasing the thickness of the second yoke 52 in the vertical direction can increase the first magnetic attractive force more efficiently than increasing the thickness of the third yoke 6 in the vertical direction. . Therefore, by increasing the thickness of the second yoke 52, it is possible to more reliably prevent a decrease in contact pressure between the contacts.

  In the present embodiment, the contact portion 52 is made of a magnetic material, so that it is used as the second yoke 52 having both functions of the contact portion and the yoke. 52 may be formed of a nonmagnetic material and a yoke may be provided separately. In that case, the yoke is provided substantially at the center of the pair of fixed terminals 33 and is provided to face the axis of the movable shaft 5.

  Further, in the present embodiment, since the second yoke 52 and the third yoke 6 are formed in a substantially rectangular flat plate shape, each point on the surface of the second yoke 52 facing the third yoke 6 is determined. The distance from the first yoke 6 to the third yoke 6 becomes substantially constant, and the first magnetic attractive force acting on the third yoke 6 can be made uniform.

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

(Embodiment 5)
The contact device of this embodiment is demonstrated using FIG. Note that the contact device of the present embodiment and the contact device of the fourth embodiment differ only in the shape of the yoke plate 7 (third yoke), and the structures common to the fourth embodiment are denoted by the same reference numerals. Description is omitted. The description will be made with reference to the vertical and horizontal directions in FIG. 15 and the direction orthogonal to the vertical and horizontal directions as the front and rear direction.

  As shown in FIG. 15, the third yoke 7 of the present embodiment includes a base portion 7a having a substantially rectangular flat plate shape, and a pair of extending portions 7b extending upward from both front and rear ends of the base portion 7a. It is formed in a substantially U-shaped cross section.

  As shown in FIG. 16, when the contacts are conducted, the tip of the extended portion 7 b in the third yoke 7 is close to the second yoke 52, so that the second yoke 52 is closer than the third embodiment. The gap between the second yoke 52 and the third yoke 7 is reduced, and the third yoke 7 receives a stronger first magnetic attractive force from the second yoke 52. That is, a larger upward force is applied to the movable contact 35.

  Therefore, in the contact device according to the present embodiment, the first magnetic attractive force acting between the second yoke 52 and the third yoke 7 is larger than that in the fourth embodiment, and is further increased upward with respect to the contact 35. This can further prevent a decrease in contact pressure between the contacts.

  Here, since the first magnetic attraction force is a contact repulsive force (downward force) generated in the movable contact 35, the contact repulsive force is a force (upward force) that is approximately 180 degrees in the opposite direction. It is the force that works in the direction to counteract the most efficiently.

  Therefore, in the contact device of this embodiment, the contact wear at the left and right contacts is substantially equal due to the provision of the pair of permanent magnets 46, and the movable contact 35 is stronger than the first embodiment. It is attracted to the fixed contact 32 side by a magnetic attraction force. That is, the contact device of the present embodiment has a stable arc breaking performance and is pressed toward the fixed contact 32 by the third yoke 7 to have a more stable contact opening / closing performance.

  In the present embodiment, the second yoke 52 functions as both a yoke and an abutment portion, and the second yoke 52 and the shaft portion 51 are integrally formed to form the movable shaft 5. Composed. Therefore, one component (movable shaft 5) can function as a yoke, a contact portion, and a shaft portion, thereby reducing the number of components.

  In the present embodiment, the second yoke 52 and the shaft portion 51 are integrally molded. However, after the second yoke 52 and the shaft portion 51 are separately molded, the shaft portion is formed on the second yoke 52. It may be formed integrally by inserting 51 or the like.

  In the present embodiment, the second yoke 52 is made of a magnetic material and is used as a yoke contact portion having both functions of the contact portion and the yoke. 52 may be formed of a nonmagnetic material and a yoke may be provided separately. In that case, the second yoke 52 is provided at substantially the center of the pair of fixed terminals 33 and substantially opposite to the axis of the movable shaft.

  In addition, a substantially annular groove 71a is formed in the center of the lower surface of the base portion 7a of the third yoke 7, and the upper end of the contact pressure spring 36 is fitted into the groove 71a, whereby the contact pressure spring. When the sitting of 36 is stabilized and a contact repulsive force is generated on the movable contact 35, a uniform force acts on the movable contact 35, and the yield strength against the contact repulsive force can be stably obtained.

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

(Embodiment 6)
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 fifth embodiment are different only in the shape of the yoke contact portion 53 (second yoke 53). A description thereof will be omitted. Note that the description will be made with reference to the vertical and horizontal directions in FIG.

  As shown in FIG. 17, the second yoke 53 of the present embodiment includes a substantially rectangular flat plate-like base portion 53a and a pair of extending portions 53b that extend downward from both front and rear ends of the base portion 53a. It is formed in a substantially U-shaped cross section.

  Then, as shown in FIG. 18, when the contacts are conducted, the tip surface of the extended portion 53b of the second yoke 53 is close to the tip surface of the extended portion 7b of the third yoke 7, The first magnetic attractive force acting between the second yoke 53 and the third yoke 7 is further increased. Further, the second yoke 53 is set by setting the gap between the distal end surface of the extending portion 53 b and the distal end surface of the extending portion 7 b so as to face the substantially center of the side end portion of the movable contact 35. The leakage magnetic flux generated from the gap between the second yoke 53 and the third yoke 7 can be reduced, and the first magnetic attraction force acting between the second yoke 53 and the third yoke 7 can be reduced more than in the fifth embodiment. It can be further enhanced. That is, a larger upward force substantially parallel to the displacement direction of the movable contact 35 acts on the movable contact 35.

Therefore, in the contact device of the present embodiment, the contact wear at the left and right contacts is substantially equal due to the provision of the pair of permanent magnets 46, and the movable contact 35 is connected to the third yoke 7 from the fourth embodiment. Is pressed to the fixed contact 32 side with an even stronger force. That is, the contact device of the present embodiment has a stable arc breaking performance and a more stable contact opening / closing performance.
Here, since the first magnetic attraction force is a contact repulsive force (downward force) generated in the movable contact 35, the contact repulsive force is a force (upward force) that is approximately 180 degrees in the opposite direction. It is the force that works in the direction to counteract the most efficiently.

  In the present embodiment, the second yoke 53 has both functions of a yoke and a contact portion, and the second yoke 53 and the shaft portion 51 are integrally formed so that the movable shaft 5 is Composed. Therefore, one component (movable shaft 5) can function as a yoke, a contact portion, and a shaft portion, thereby reducing the number of components.

  In the present embodiment, the second yoke 53 and the shaft portion 51 are integrally molded. However, after the second yoke 53 and the shaft portion 51 are separately molded, the second yoke 53 has a shaft portion. It may be formed integrally by inserting 51 or the like.

In the present embodiment, the contact portion 53 is made of a magnetic material and is used as a yoke contact portion having both functions of the contact portion and the yoke. May be formed from a non-magnetic material and a yoke may be provided separately. In that case, the yoke is provided substantially at the center of the pair of fixed terminals 33 and substantially opposite to the axis of the movable shaft.

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

(Embodiment 7)
The contact device of this embodiment will be described with reference to FIGS. Note that the description will be made with reference to the vertical and horizontal directions in FIG.

  The contact device of the present embodiment has a fixed terminal 33 with a fixed contact 32 provided at the lower end, a movable contact 68 having a movable contact 61 that contacts and separates from the fixed contact 32, and an upper surface of the movable contact 68. The second yoke 69 disposed, a contact pressure spring 65 that urges the movable contact 68 toward the fixed contact 32, a holding member 66 that holds the second yoke 69, and the holding member 66 are connected. The movable shaft 67 and the electromagnet block 2 that drives the movable shaft 67 so that the movable contact 61 contacts and separates from the fixed contact 32 are provided. Since the fixed contact 32, the fixed terminal 33, and the electromagnet block 2 are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

  The movable contact 68 is formed in a substantially rectangular plate shape, and movable contacts 61 are provided on both ends of the upper surface in the longitudinal direction (left-right direction).

  The second yoke 69 is formed in a flat plate shape from a magnetic material such as soft iron, and is provided to face the upper surface of the movable contact 62.

  The contact pressure spring 65 abuts the upper end of the contact pressure spring 65 substantially at the center of the lower surface of the movable contact 68, and a protrusion 68 a protruding from the approximate center of the lower surface of the movable contact 68 is inserted into the inner diameter portion of the contact pressure spring 65. To do.

  The holding member 66 includes a base portion 661 having a substantially rectangular plate shape, a pair of holding portions 662 extending upward from both ends in the front-rear direction of the base portion 661, and tips of the pair of holding portions 662 inward in the front-rear direction. It is comprised from the contact part 663 bent toward.

  And between the pair of holding portions 662, the contact pressure spring 65 whose lower end is in contact with the upper surface of the base portion 661, the movable contact 68 whose lower surface is pressed against the contact pressure spring 65, and the lower surface is the upper surface of the movable contact 68. A second yoke 69 that is held by a pair of holding portions 662 is disposed opposite to the first yoke 69.

  Here, a substantially columnar protrusion 664 protrudes substantially from the center of the upper surface of the base 661 of the holding member 66, and the protrusion 664 is fitted into the lower end side inner diameter portion of the contact pressure spring 65. As a result, the contact pressure spring 65 is fixed in a compressed state between the base 661 and the movable contact 68, and urges the movable contact 68 toward the fixed contact 32 (upward). The movable contact 68 tries to move to the fixed terminal 33 side (upward) by the biasing force of the contact pressure spring 65, but the upper surface of the movable contact 68 is restricted from moving upward by the contact portion 663. By abutting against the second yoke 69, the movement toward the fixed contact 32 is restricted.

  The movable shaft 67 is formed in a substantially rod-like shape that is long in the vertical direction, the electromagnet block 2 is connected to the lower end side, and the base 661 of the holding member 66 is fixed to the upper end.

  In the contact device of the present embodiment configured as described above, when the movable shaft 67 is displaced upward by the driving means 2, the holding member 66 connected to the movable shaft 67 is also displaced upward. Then, along with the displacement, the second yoke 69 held by the holding member 66 also moves upward, whereby the restriction on the upward movement with respect to the movable contact 68 is released. Then, the movable contact 68 moves upward by the biasing force of the contact pressure spring 65, and the movable contact 61 provided on the movable contact 68 abuts against the fixed contact 32 so that the contacts are electrically connected.

  Here, when the contacts are conducted and current flows through the movable contact 62, an upward electromagnetic force (attraction force) acts on the movable contact 68 as described with reference to FIG. 5B of the first embodiment. . That is, the movable contact 68 is applied with a suction force toward the fixed contact that is substantially parallel to the displacement direction of the movable contact 68 (vertically upward).

  Here, the vertically upward suction force acting on the movable contact 68 is 180 degrees opposite to the contact repulsive force (downward force) generated on the movable contact 68. Therefore, the contact repulsive force is It is the force that works in the direction of the most efficient cancellation. Therefore, the contact repulsive force can be effectively canceled by the suction force, and the decrease in the contact pressure between the contacts can be reduced.

  Therefore, in the contact device of the present embodiment, the contact consumption at the left and right contacts is substantially equal due to the provision of the pair of permanent magnets 46, and the second yoke 69 attracts the movable contact 35 to the fixed contact side. Thus, the contact device of the present embodiment has a stable arc breaking performance while improving the resistance to electromagnetic repulsion when a load is short-circuited, and can obtain a more stable contact switching performance.

  Note that the fixed contact 32 may be either provided integrally with the fixed terminal 33 or provided separately. Similarly, the movable contact 61 may be either provided integrally with the movable contact 62 or provided separately.

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

(Embodiment 8)
The contact device of this embodiment is demonstrated using FIGS. Note that the description will be made with reference to the vertical and horizontal directions in FIG.

  The contact device of the present embodiment has a fixed terminal 33 with a fixed contact 32 provided at the lower end, a movable contact 62 having a movable contact 61 that contacts and separates from the fixed contact 32, and an upper surface of the movable contact 62. A second yoke 63 disposed, a third yoke 64 disposed opposite to the lower surface of the movable contact 62, and a contact pressure spring for biasing the movable contact 62 toward the fixed contact 32 65, a holding member 66 that holds the second yoke 63, a movable shaft 67 that is connected to the holding member 66, and an electromagnetic block 2 that drives the movable shaft 67 so that the movable contact 61 contacts and separates from the fixed contact 32. And. Since the fixed contact 32, the fixed terminal 33, and the electromagnet block 2 are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

  The movable contact 62 is formed in a substantially rectangular plate shape, and movable contacts 61 are provided on both ends of the upper surface in the longitudinal direction (left-right direction). In addition, a substantially rectangular notch 62 a is formed in the approximate center of each long side of the movable contact 62.

  The second yoke 63 is formed of a magnetic material such as soft iron and has a substantially U-shaped cross section. A substantially rectangular plate-like base 631 facing the upper surface of the movable contact 62 and both ends of the base 631 are bent. It is comprised from a pair of extension part 632 extended below. The second yoke 63 restricts the movement of the movable contact 62 in the left-right direction by inserting the extending portion 632 through the notch 62 a of the movable contact 62.

  The third yoke 64 is formed in a substantially rectangular plate shape from a magnetic material such as soft iron, is fixed to the lower surface of the movable contact 62, and faces the second yoke 63 via the movable contact 62. Then, the tips of the pair of extending portions 632 in the second yoke 63 face the upper surface of the third yoke 64, and the movable contact 62 is sandwiched between the first and second yokes 63 and 64. In the present embodiment, the third yoke 64 is fixed to the movable contact 62 and is provided integrally with the movable contact 62. However, the third yoke 64 contacts the lower surface of the movable contact 62. It may be provided separately from the movable contact 62 in contact therewith.

  The contact pressure spring 65 has an upper end in contact with the lower surface of the third yoke 64, and a protrusion 64 a that protrudes substantially at the center of the lower surface of the third yoke 64 is fitted into the inner diameter portion on the upper end side of the contact pressure spring 65. To do.

  The holding member 66 includes a base portion 661 having a substantially rectangular plate shape, a pair of holding portions 662 extending upward from both ends in the front-rear direction of the base portion 661, and the ends of the pair of holding portions 662 folded inward. It is comprised from the contact part 663 bent.

  A movable contact 62 and a contact pressure spring 65 sandwiched between the second and third yokes 63 and 64 are disposed between the pair of sandwiching portions 662, and the second yoke 63 is sandwiched between the pair of sandwiching portions 662. Held by the portion 662.

  Here, a substantially columnar protrusion 664 protrudes substantially from the center of the upper surface of the base 661 of the holding member 66, and the protrusion 664 is fitted into the lower end side inner diameter portion of the contact pressure spring 65. As a result, the contact pressure spring 65 is fixed in a compressed state between the base 661 and the third yoke 64, and the movable contact 62 is biased to the fixed contact 32 side (upward) via the third yoke 64. To do. The movable contact 62 tries to move to the fixed terminal 33 side (upward) by the biasing force of the contact pressure spring 65, but the upper surface of the movable contact 62 is restricted from moving upward by the contact portion 663. By abutting on the second yoke 63, the movement toward the fixed contact 32 is restricted.

  The movable shaft 67 is formed in a substantially rod-like shape that is long in the vertical direction, the electromagnet block 2 is connected to the lower end side, and the base 661 of the holding member 66 is fixed to the upper end.

  In the contact device of the present embodiment configured as described above, when the movable shaft 67 is displaced upward by the driving means 2, the holding member 66 connected to the movable shaft 67 is also displaced upward. Then, along with the displacement, the second yoke 63 held by the holding member 66 also moves upward, whereby the restriction on the upward movement with respect to the movable contact 62 is released. Then, the movable contact 62 moves upward together with the third yoke 64 by the biasing force of the contact pressure spring 65, and the movable contact 61 provided on the movable contact 62 abuts on the fixed contact 32 so that the contacts are electrically connected. To do.

  Here, when the contacts are conducted and a current flows through the movable contact 62, a magnetic field is generated around the movable contact 62, and the second and third yokes 63 and 64 are connected as shown in FIG. A passing magnetic flux is formed. As a result, a magnetic attractive force is generated between the second and third yokes 63 and 64, and the third yoke 64 is attracted to the second yoke 63. Therefore, the third yoke 64 presses the lower surface of the movable contact 62, and an upward force that presses the movable contact 62 toward the fixed contact 32 side works.

  Here, since the magnetic attraction force acting on the third yoke 64 is a force in the direction opposite to the contact repulsive force (downward force) generated in the movable contact 62, the contact repulsive force is the highest. It is a force that works in the direction to counteract efficiently.

  Therefore, the contact device of the present embodiment has a stable arc breaking performance, and the third yoke 64 presses the movable contact 62 toward the fixed contact 32 side, and thus has a stable contact opening / closing performance. Yes.

  Further, when the movable shaft 67 is further driven to the fixed contact 32 side (hereinafter referred to as overtravel) after the contacts are conducted, the movable contact 62 contacts the fixed terminal 33 and moves upward. Due to the restriction, the second yoke 63 held by the holding member 66 is separated from the movable contact 62. Here, for example, as shown in FIG. 24A, when a substantially flat yoke 63 'is used as the second yoke and a substantially U-shaped yoke 64' is used as the third yoke, the yoke Since the magnetic path 63 ′ and the magnetic path of the yoke 64 ′ are not continuous, a leakage magnetic flux is generated between the yoke 63 ′ and the yoke 64 ′.

  However, in the contact device of the present embodiment, since the second yoke 63 is formed in a substantially U-shape, even during overtravel, as shown in FIG. Since the extending portion 632 of the first electrode contacts the movable contact 62, the magnetic path of the second yoke 63 and the magnetic path of the third yoke 64 are continuously connected via the movable contact 62 to prevent leakage magnetic flux. . Therefore, it is possible to prevent leakage magnetic flux from being generated between the second yoke 63 and the third yoke 64, and to prevent a decrease in magnetic attractive force acting on the third yoke 64.

  Further, as shown in FIG. 25, the substantially U-shaped second yoke 63 has a facing area S1 with respect to the movable contact 62 so that the facing area S2 with respect to the movable contact 62 of the flat third yoke 64 has Since it is relatively large, it is easier to receive the magnetic flux from the movable contact 62, and the magnetic path length L1 of the second yoke 63 is longer than the magnetic path length L2 of the third yoke 64. Therefore, increasing the thickness of the second yoke 63 in the vertical direction increases the magnetic attractive force acting on the third yoke 64 more effectively than increasing the thickness of the third yoke 64 in the vertical direction. be able to.

  In addition, the second yoke 63 is located closer to the fixed terminal 33 than the third yoke 64 and easily receives the magnetic flux from the fixed terminal 33, so that the magnetic flux density is higher than that of the third yoke 64.

  From the above, by forming the second yoke 63 on the fixed terminal 33 side in a substantially U shape, the magnetic attraction force against the third yoke 64 can be efficiently increased. The magnetic attraction force with respect to the third yoke 64 obtained when the yoke 63 has a flat plate shape can be obtained with a substantially U-shaped yoke having a thickness smaller than that of the flat plate yoke. Therefore, by making the second yoke 63 substantially U-shaped, the thickness of the second yoke 63 can be suppressed while maintaining the magnetic attraction force with respect to the third yoke 64, and the contact device can be downsized. Can be achieved.

  Note that the fixed contact 32 may be either provided integrally with the fixed terminal 33 or provided separately. Similarly, the movable contact 61 may be either provided integrally with the movable contact 62 or provided separately.

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

(Embodiment 9)
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 any one of Embodiments 1 to 8, 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 any contact device of Embodiment 1 thru | or 8, since the same effect can be acquired, in this actual embodiment, it is a permanent magnet piece in the contact device of Embodiment 1. The case where 48 is provided will be described. In the following, description will be made with reference to the vertical and horizontal directions in FIG.

  The permanent magnet piece 48 is formed in a substantially rectangular parallelepiped shape, is disposed at a substantially center between the pair of permanent magnets 46 and faces the upper surface of the movable contact 35, and further, a substantially center between the pair of first yokes 47. Is located. Here, the permanent magnet 48 is disposed such that the surfaces facing each other with respect to the pair of permanent magnets 46 and the pair of first yokes 47 are substantially parallel to each other.

  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 first yokes 47 is attracted to the permanent magnet piece 48 and relayed by the permanent magnet 46.

  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 the pair of first yokes 47, and the magnetic flux density in the vicinity of each contact portion. Will improve. 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.

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

2 Electromagnet block 3 Contact block 5 Movable shaft 6 Third yoke 7 Third yoke 32 Fixed contact 33 Fixed terminal 34 Movable contact 35 Movable contact 36 Contact spring 46 Permanent magnet 47 First yoke 51 Shaft 52 Second The York

Claims (21)

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 pair in which the polarities of the surfaces facing each other are the same, with the polarities of the surfaces facing each other being provided 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 With permanent magnets,
A second yoke disposed between the pair of permanent magnets and facing each of the pair of permanent magnets;
The driving means is in contact with one surface of the movable contact so as to restrict the movement of the movable contact toward the fixed contact, a movable shaft to which the contact is coupled, and the movable An electromagnet block that drives the movable shaft so that a contact is in contact with and away from the fixed contact;
The contact device, wherein the second yoke also serves as the contact portion and is formed integrally with the movable shaft .   2. The contact device according to claim 1, wherein a first yoke that connects the pair of permanent magnets is provided opposite to an end face of the movable contact in a direction in which the movable contacts are arranged in parallel.   The contact device according to claim 1, wherein the second yoke is provided to face one surface of the movable contact.   The contact device according to claim 1, wherein the movable contact is disposed closer to one of the pair of permanent magnets.   5. The contact device according to claim 1, wherein one of the pair of permanent magnets is formed to be thicker than the other.   The drive means includes a contact pressure spring that urges the movable contact toward the fixed contact, and a restriction including a contact portion that restricts movement of the movable contact toward the fixed contact. 6. The contact device according to claim 1, wherein the movable shaft is connected to the restricting means.   7. The contact device according to claim 3, further comprising a third yoke that contacts the other surface of the movable contact and faces the second yoke through the movable contact.   The movable shaft includes a shaft portion that is movably inserted into an insertion hole formed in the movable contact, and the contact portion is provided at one end of the shaft portion. 7. The contact device according to 7. 9. The contact device according to claim 1, wherein the contact block is housed in a container, and at least a part of the outer periphery of the second yoke abuts against an inner wall of the container. The contact according to claim 7, wherein the contact block is housed in a container, and at least a part of the outer periphery of each of the second and third yokes abuts against an inner wall of the container. apparatus. The contact device according to claim 1, wherein the second yoke is formed in a flat plate shape. 11. The contact device according to claim 7, wherein at least one of the second and third yokes is formed in a flat plate shape. The second yoke has a substantially U-shaped cross section from a flat plate-like base portion facing the movable contact and a pair of extended 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 second and third 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 7, wherein the contact device is formed in a substantially U-shaped cross section. 15. The contact device according to claim 7, wherein the second yoke is formed thicker than the third yoke in the axial direction of the movable shaft. 14. The gap between the second and third yokes faces a side end of the movable contact when at least the movable contact and the fixed contact abut. 15. The contact device according to any one of 15. 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 first yokes is 17. The contact device according to claim 2, 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. 18. The third yoke according to any one of claims 7 to 17, wherein a groove portion into which one end of the contact pressure spring is fitted is formed on a surface opposite to a surface that contacts the movable contact. Contact device. 18. The third yoke according to any one of claims 7 to 17, wherein a protrusion that fits into one end of the contact pressure spring is formed on a surface opposite to a surface that contacts the movable contact. Contact device. The contact device according to claim 1, wherein the fixed contact is provided integrally with the fixed terminal or separately. 21. The contact device according to claim 1, wherein the movable contact is provided integrally with the movable contactor or separately.

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