JP5629106B2 - 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. 13, a movable contact having 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.

  In addition, the permanent magnet 9 is disposed on one side and the other side in the longitudinal direction of the movable contact 82 so as to face each other via the contact block 8.

  Then, when the movable contact 821 contacts and separates from the fixed contact 811, the arc current generated between the contacts is stretched by the magnetic field generated by the pair of permanent magnets 9 to interrupt the arc.

JP 2004-71512 A

  In the contact device shown in the above prior art, since the pair of permanent magnets 9 are disposed on both ends in the longitudinal direction of the contact block 9, the magnetic gap between the pair of permanent magnets 9 is increased. More leakage magnetic flux is generated. For this reason, there is a possibility that the force for extending the arc generated between the contacts is weak and sufficient arc interruption performance cannot be obtained.

  Here, as a method of improving the arc interruption performance in the contact device, a method of enlarging the pair of permanent magnets 9 can be considered. In this case, the cost of the permanent magnet 9 is increased and the outer diameter size of the contact device is increased. There is a problem such as.

  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, a driving means for driving the movable contact so that the movable contact comes in contact with and away from the fixed contact, and a contact block arranged in the direction in which the movable contacts are arranged, facing each other. A pair of permanent magnets having different polarities on the surface to be operated, and a first yoke disposed between the pair of permanent magnets, the pair of permanent magnets, the first yoke and the pair of permanent magnets The fixed contact means that one of the pair of permanent magnets, one fixed contact of the pair of fixed contacts, the first yoke, the pair of fixed contacts in the direction in which the movable contacts are arranged side by side. Fix the other Point, characterized in that it is arranged in the order of the other permanent magnet of the pair of permanent magnets.

  According to a second invention, in the first invention, each of the movable contact elements is opposed to each end face in a direction perpendicular to the parallel arrangement direction of the movable contacts and the contact / separation direction of the movable contact and the fixed contact. A pair of second yokes for connecting the pair of permanent magnets is provided.

  According to a third invention, in the first or second invention, the drive means is configured to cause a contact pressure spring that biases the movable contact toward the fixed contact, and a movement of the movable contact toward the fixed contact. It is characterized by comprising a regulating means for regulating, a movable shaft to which the regulating means is coupled, and an electromagnet block for driving the movable shaft so that the movable contact contacts and separates from the fixed contact.

  In a fourth aspect based on the third aspect, the movable shaft includes a shaft portion that is movably inserted in an insertion hole formed in the movable contact, and the movable contact provided at one end of the shaft portion. It is characterized by being comprised from the contact part contact | abutted to one surface of a child.

  According to a fifth invention, in the fourth invention, the first yoke also serves as a contact portion of the movable shaft.

  A sixth invention is characterized in that, in the fourth or fifth invention, the first yoke is formed integrally with the movable shaft so as to serve as a contact portion of the movable shaft.

  In a seventh aspect based on the third aspect, the restricting means holds the first yoke, the movable contact and the contact pressure spring, and the fixed contact side of the movable contact via the first yoke. It is characterized by restricting movement to.

  An eighth invention is characterized in that, in any one of the first to seventh inventions, the contact block is housed in a container, and at least a part of the outer periphery of the first yoke contacts the inner wall of the container. And

  According to a ninth invention, in any one of the first to eighth inventions, the first yoke is formed in a flat plate shape.

  A tenth aspect of the invention is the invention according to any one of the first to eighth aspects, wherein the first yoke extends from the end of the base portion toward the movable contact side facing the movable contact portion. It is characterized by being formed in a substantially U-shaped cross section from a pair of extended portions.

  An eleventh invention is characterized in that, in any one of the first to tenth inventions, the fixed contact is provided integrally with the fixed terminal or separately.

  A twelfth invention is characterized in that, in any one of the first to eleventh inventions, the movable contact is provided integrally with 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 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 schematic perspective view of the contact apparatus in Embodiment 2 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 3 of this invention is shown. The schematic side view of the contact apparatus in the same as the above is shown. Sectional drawing of the contact apparatus in a prior art example 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. Hereinafter, the location where the movable contact 34 contacts and separates from the fixed contact 32 is referred to as a contact portion.

  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. Here, the pair of movable contacts 34 are provided at positions where the distances from the insertion holes 35a are equal.

  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 first yoke 52. A shaft 51 is connected to the center of the lower surface of the first yoke 52, and the shaft 51 passes through the center of the movable contact 35.

  The permanent magnet 46 is formed in a substantially rectangular parallelepiped shape and is provided substantially parallel to the short direction of the movable contact 35. Here, the permanent magnets 46 are respectively disposed on the left and right sides of the movable contact 35 so as to face each other via a gap (contact gap) between the fixed contact 32 and the movable contact 34, and a pair of permanent magnets facing each other. In 46, the polarities of the faces facing each other are different. Specifically, the left permanent magnet 46 is provided so that the right side is N-pole and the left side is S-pole, and the right permanent magnet 46 is provided so that the left side is S-pole and the right side is N-pole. ing. Thereby, a magnetic flux from left to right is generated between the pair of permanent magnets 46, and the magnetic flux passes in the vicinity of each contact portion.

  In addition, the pair of permanent magnets 46 are disposed so that the centers of the surfaces facing each other are positioned on a straight extension line connecting the pair of fixed contacts 32. In addition, the distance between the left permanent magnet 46 and the left contact portion and the distance between the right permanent magnet 46 and the right contact portion are arranged to be substantially equal. Accordingly, the magnetic flux density around each contact portion is substantially equal.

Further, since the first yoke 52 of the movable shaft 5 is positioned between the pair of permanent magnets 46, the magnetic flux generated between the pair of permanent magnets 46 is between the pair of permanent magnets 46. Relayed to That is, the first yoke 52 can efficiently guide the magnetic flux generated between the pair of permanent magnets 46 to the vicinity of the contact portion.

  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.

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 field. More specifically, in FIG. 2, when current flows from the left to the right through the movable contact 35, the arc generated between the left contacts is stretched forward and the arc generated between the right contacts is stretched backward.
In FIG. 2, when a current flows from the right to the left through the movable contact 35, the arc generated between the left contacts is stretched backward, and the arc generated between the right contacts is stretched forward. In addition, the number 31 in FIG. 2 shows the sealing container 31 mentioned later.

Here, in this embodiment, the first yoke 52 is positioned between the pair of permanent magnets 46, so that the magnetic flux from the left permanent magnet 46 to the right permanent magnet 46 is attracted to the first yoke 52. Relayed to the first yoke 52 . Therefore, the leakage magnetic flux generated in the magnetic gap between the pair of permanent magnets 46 is suppressed, the magnetic flux density at each contact portion is increased, and the force for extending the arc is improved. Therefore, even when the size of the permanent magnet 46 is reduced, the force necessary to extinguish the arc can be maintained. 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.

  Further, as shown in FIG. 3, a pair of second yokes 47 can be provided to connect the pair of permanent magnets 46 so as to face each end face in the short direction of the movable contact 35. The second yoke 47 extends from the both ends of the base portion 47a facing the short-side end surface of the movable contact 35 and the base portion 47a substantially perpendicularly to the base portion 47a. It is formed in a substantially U shape from a pair of extending portions 47b to be connected. Here, of the pair of extending portions 47b, one (left side) extending portion 47b is connected to the left surface (S pole surface) of the left permanent magnet 46, and the other (right side) extending portion 47b is It is connected to the right surface (N pole surface) of the right permanent magnet 46.

  As a result, the contact block 3 is surrounded by the pair of permanent magnets 46 and the pair of second yokes 47, and leakage magnetic flux generated in the magnetic gap between the pair of permanent magnets 46 is suppressed. Accordingly, the magnetic flux density in the vicinity of each contact is improved, and the force for stretching the arc generated between the contacts is increased. In other words, by providing the second yoke 47, the force that stretches the arc can be maintained even if the size of the permanent magnet 46 is reduced. Therefore, the contact device can be further reduced in size and cost while maintaining the arc interruption performance. Can be achieved.

  As shown in FIG. 4A, 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. 4A, the number of magnetic fluxes from the right to the left in the conductor is substantially equal to the number of magnetic fluxes from the left to the right in the conductor, and no electromagnetic force is generated in the conductor.

However, in the contact device of the present embodiment, when the contacts are conducted, the movable contact is affected by the influence of the first yoke 52 close to the upper surface of the movable contact 35 as shown in FIG. The balance of the magnetic field generated around the child 35 is lost. More specifically, in FIG. 4B, most of the magnetic flux from right to left is attracted to the first yoke 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.

  On the other hand, in FIG. 4B, 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, the contact device of the present embodiment has a stable contact opening / closing performance because the first yoke 52 sucks the movable contact 35 toward the fixed contact.

  In the present embodiment, the first yoke 52 functions as both a yoke and a contact portion, and the first 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 first yoke 52 and the shaft portion 51 are integrally molded. However, after the first yoke 52 and the shaft portion 51 are separately molded, the shaft portion is attached to the first 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. 5, for example.

  As shown in FIGS. 5 (a), 5 (b), 6 (a), 6 (b), and 7 (a) to 7 (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 second 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. 7C, 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 portion 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. 7B, 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 one yoke 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 first yoke 52 is formed in a substantially rectangular flat plate shape from soft iron, and restricts the movement of the movable contact 35 to the fixed contact side. That is, the first yoke 52 has a function of a contact portion that restricts movement of the movable contact 35 and a function of the yoke . In other words, the first yoke 52 also serves as a contact portion 52 of the movable shaft 5 is provided integrally with the movable shaft 5.

  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.7 (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 a substantially central portion 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 on both the left and right side surfaces of the sealing container 31 in contact with the sealing container. The pair of permanent magnets 46 are provided to face each other with the sealing container 31 interposed therebetween, and the polarities of the faces facing each other are different. 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 second 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. And are disposed on the front side and the rear side of the sealing container 31, respectively. The base portion 47a is provided in contact with the front and rear 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 left and right directions. That is, of the pair of extending portions 47b, one (left side) extending portion 47b contacts the left surface (S pole surface) of the left permanent magnet 46, and the other (right side) extending portion 47b is positioned on the right side. The permanent magnet 46 is in contact with the right surface (N pole surface).

  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. 7C, 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 also moves downward as the first 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 first 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.

  Here, in the electromagnetic relay, the first 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. 4B, 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 acts between the contacts, the movable contact 35 has a suction force in the direction opposite to the contact repulsive force by 180 degrees, so that the contact repulsive force can be canceled out efficiently. It is possible to prevent problems such as a decrease in contact pressure and contact welding due to arc at the time of contact opening.

  Further, since the first yoke 52 is formed in a substantially flat plate shape, the distance from each point on the surface of the first 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 first 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. 8, the first 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 first yoke 52 is in contact with the inner wall of the case 4, the first and only a part of the first yoke 52 abuts against 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. Note that the contact device of the present embodiment and the contact device of the first embodiment differ only in the shape of the first 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. 9, the first 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 first 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. 10, the balance of the magnetic field generated around the movable contact 35 is lost due to the influence of the first yoke 53 adjacent to the upper surface and the front and rear ends of the movable contact 35. More specifically, in FIG. 10, most of the magnetic flux from the right to the left in the movable contact 35 is attracted to the first yoke 53. Therefore, compared with the case where the flat plate-shaped first yoke 52 shown in FIG. 4B 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. 10, the magnetic flux from the left to the right in the movable contact 35 moves upward as a whole, and the flat first 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 first yoke 53 exerts a force (attraction force) that cancels the contact repulsion force stronger than that of 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 the present embodiment, the first yoke 53 functions as both a yoke and a contact portion, and the first yoke 53 and the shaft portion 51 are integrally formed so that the movable shaft 5 is formed. 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.

Further, the first yoke 53 is a case where the pair of extending portions 53b are provided in contact with the inner wall of the case 4 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 first yoke 53 from rotating. It may be done.

  In the present embodiment, the first yoke 53 and the shaft portion 51 are integrally molded. However, after the first yoke 53 and the shaft portion 51 are separately molded, the shaft portion is formed on the first yoke 53. 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 3)
The contact device of this embodiment will be described with reference to FIGS. The description will be made with reference to the vertical and horizontal directions in FIG. 11 and the direction orthogonal to the vertical and horizontal directions as the front and rear direction.

  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 first yoke 69 disposed, the contact pressure spring 65 that biases the movable contact 68 toward the fixed contact 32, the holding member 66 that holds the first 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 first 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 first yoke 69 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 one 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 first 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. 4B 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 first yoke 69 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.

  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.

2 Electromagnet block 3 Contact block 5 Movable shaft 32 Fixed contact 33 Fixed terminal 34 Movable contact 35 Movable contactor 36 Contact pressure spring 46 Permanent magnet 47 Second yoke 51 Shaft 52 First yoke (regulating means)

Claims (12)

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 of permanent magnets provided opposite to each other via the contact block in the direction in which the movable contacts are arranged, and each of the polarities of the faces facing each other are different from each other;
A first yoke disposed between the pair of permanent magnets ,
The pair of permanent magnets, the first yoke, and the pair of fixed contacts are one permanent magnet of the pair of permanent magnets and one of the pair of fixed contacts in the parallel arrangement direction of the movable contacts. A contact device comprising: a fixed contact; the first yoke; the other fixed contact of the pair of fixed contacts; and the other permanent magnet of the pair of permanent magnets .   A pair of first magnets that connect the pair of permanent magnets facing each end face of the movable contact in a direction perpendicular to the direction in which the movable contacts are arranged side by side and the direction in which the movable contact and the fixed contact are separated from each other. The contact device according to claim 1, wherein two yokes are provided.   The driving means includes a contact pressure spring that biases the movable contact toward the fixed contact, a restriction that restricts movement of the movable contact toward the fixed contact, and a movable shaft to which the restriction is coupled. 3. The contact device according to claim 1, further comprising: an electromagnet block that drives the movable shaft so that the movable contact contacts and separates from the fixed contact.   The movable shaft includes a shaft portion that is movably inserted in an insertion hole formed in the movable contact, and a contact portion that is provided at one end of the shaft portion and contacts one surface of the movable contact. The contact device according to claim 3, wherein:   The contact device according to claim 4, wherein the first yoke also serves as a contact portion of the movable shaft.   6. The contact device according to claim 4, wherein the first yoke is formed integrally with the movable shaft so as to serve as a contact portion of the movable shaft.   The restricting means holds the first yoke, the movable contact, and the contact pressure spring, and restricts the movement of the movable contact toward the fixed contact via the first yoke. Item 4. The contact device according to item 3.   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 first yoke abuts against an inner wall of the container.   9. The contact device according to claim 1, wherein the first yoke is formed in a flat plate shape.   The first yoke has a substantially U-shaped cross section from a flat plate-like base portion facing the movable contact and a pair of extending portions extending from the end of the base toward the movable contact. 9. The contact device according to claim 1, wherein the contact device is formed as follows.   The contact device according to claim 1, wherein the fixed contact is provided integrally with the fixed terminal or separately.   The contact device according to claim 1, wherein the movable contact is provided integrally with the movable contactor or provided separately.

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