JP5501057B2 - 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. 18, a movable contact having a pair of fixed terminals 81 having a fixed contact 811 and a pair of movable contacts 821 contacting and leaving 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, a first yoke disposed between the pair of permanent magnets, and the movable contact disposed on the other surface side of the movable contact. And a third yoke opposite to the first yoke .

  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.

According to a sixth invention, 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 contactor, the third yoke, and the contact pressure spring via the first yoke. The movement of the movable contact to the fixed contact side is restricted.

An eighth invention, in any one of the invention first to seventh, wherein the contact block is housed in the container, the first, at least one of the third yoke, said container part of the outer periphery It is formed so that it can contact | abut to the inner wall of this.

A ninth aspect of the invention, as in one of the first to eighth, wherein the first, third yoke, characterized in that at least one is formed in a plate shape.

A tenth invention is, as in one of the first to eighth, wherein the first, third yoke includes a flat plate-shaped base portion at least either one is opposed to the movable contact, from the end 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.

Eleventh aspect, in the invention, either the first through tenth, the first yoke in the axial direction of the movable shaft, and wherein the thickness is thicker than that of the third yoke To do.

In a twelfth invention according to any one of the ninth to eleventh inventions, the gap between the first 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.

A thirteenth invention, in any one of the invention first to 12, wherein the third yoke, the movable contact is a surface contacting the groove fits one end of the pressure spring on the opposite side It is formed.

A fourteenth invention, in any one of the invention first to 12, the third yoke is fitted to one end of the pressure spring on the opposite side is the surface abutting against the movable contact projection Is formed.

Fifteenth aspect, in any one of the invention first to 14, the fixed contact is integral with the fixed terminals, or, you characterized in that it is provided separately.

According to a sixteenth aspect of the present invention, in any one of the first to fifteenth aspects, the movable contact is provided integrally with the movable contact or separately.

  According to the present invention, there is an effect that a stable arc interruption performance can be obtained and a contact device with a reduced size can be provided.

The schematic perspective view of the sealing contact apparatus in Embodiment 1 of this invention is shown. 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. The schematic of the contact apparatus in Embodiment 4 of this 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. 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. The contact block 3 including the pressure spring 36, the third yoke 6 fixed to the lower surface of the movable contact 35, the insertion hole 35a formed in the movable contact 35, and the third yoke 6 are illustrated. The movable shaft 5 that is movably inserted through the insertion hole not to be moved and restricts the movement of the movable contact 35 to the fixed contact side 32, and the electromagnet that drives the movable shaft 5 so that the movable contact 34 contacts and separates from the fixed contact 32. 2. Description of the Related Art A contact device is known that includes a driving means including a block 2 and a permanent magnet 46 for extinguishing an arc generated in the contact block 3 in a short time.

  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 third yoke 6 is formed in a substantially rectangular plate shape from a magnetic material such as soft iron, for example, and is fixed to the lower surface of the movable contact 35, and faces the first yoke 52 through 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. Therefore, the magnetic field generated around each contact portion by the pair of permanent magnets 46 is formed symmetrically about the straight line X passing through the insertion hole 35a of the movable contact 35 and extending in the front-rear direction.

Further, since the first yoke 52 of the movable shaft 5 is provided between the pair of permanent magnets 46, the magnetic flux is attracted toward the first yoke 52 and the magnetic gap near each contact portion is reduced. Yes. 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 the present embodiment, when the movable shaft 5 is displaced upward by the electromagnet block 2, the first yoke 52 of the movable shaft 5 is also displaced upward accordingly. Then, with the displacement of the first yoke 52 upward, 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 first 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.

  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. 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 of the present embodiment can increase the resistance to the electromagnetic repulsion force when the load is short-circuited while achieving downsizing, has a stable arc breaking performance, and more stable contact switching performance. Can be obtained . Can be obtained From boss was arc interruption performance.

  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 magnetic flux emitted from the pair of permanent magnets 46 is attracted to the second yoke 47, the leakage magnetic flux is suppressed, the magnetic flux density near each contact can be improved, and the force that stretches the arc generated between the contacts. Will increase. Accordingly, the provision of the second yoke 47 can maintain the force to stretch the arc 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.

Further, when the contacts are conducted and a current flows through the movable contact 35, a magnetic field is generated around the movable contact 35, and as shown in FIG. 4, the first yoke 52 and the third yoke 6 Is formed, and a first magnetic attraction force is generated between the first yoke 52 and the third yoke 6.

The third yoke 6 is attracted to the first yoke 52 by the first magnetic attraction force acting between the first 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 first 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 of the present embodiment, the contact repulsive force can be effectively canceled out by the first magnetic attraction force, and problems such as a decrease in contact pressure between the contacts and contact welding due to an arc at the time of contact release can be obtained. Can be reduced.

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. (Drive means) The internal unit block 1 configured by integrally combining the contact block 2 and the contact block 3 is 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 third fixed to the lower surface of the movable contact 35 . the yoke 6, and the third contact third on the lower surface of the yoke 6 of the yoke 6 and the contact pressure spring 36 for urging the movable contactor 35 toward the fixed contact 33 side, and the movable contact 35 is connected to the upper end The lower end portion is connected to the movable iron core 25 and includes a movable shaft 5 that interlocks with the movement of the movable iron core 25.

  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 hook-shaped first yoke 52 that is integrally formed with the shaft portion 51 at the upper end of the shaft portion 51. It consists of.

  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 a magnetic material such as soft iron, for example, and restricts the movement of the movable contact 35 toward the fixed contact. 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 the movable contact 35, the movable contact 34 is fixed to the left and right ends of the upper surface of the main body 35a formed in a substantially rectangular shape.

The third yoke 6 is formed in a substantially rectangular flat plate shape from a magnetic material such as soft iron, for example, and is fixed to the approximate center of the lower surface of the movable contact 35. Further, an annular groove 6a is formed on the lower surface of the third yoke 6, and the upper end of the contact pressure spring 36 is fitted into the groove 6a, so that the sitting of the contact pressure spring 36 is stabilized, and the movable contactor When a contact repulsive force is generated at 35, a uniform force acts on the movable contact 35, and a yield strength against the contact repulsive force can be stably obtained.

Then, the shaft portion 51 of the movable shaft 5 is inserted into the insertion hole 35 b formed in the approximate center of the main body 35 a of the movable contact 35 and the insertion hole (not shown) formed in the approximate center of the third yoke 6.

  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 configured as described above, since the return spring 27 has a higher spring coefficient than the contact pressure spring 36, the movable iron core 25 slides downward by the urging force of the return spring 27, and accordingly the movable shaft 5 also moves downward. 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.

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. Accordingly, the first yoke 52 is in the vicinity of the third yoke 6 fixed to the movable contact 35 and between the first yoke 52 and the third yoke 6 as described in FIG. The first magnetic attractive force acts on the movable contact 35, and 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.

  Therefore, even when a contact repulsive force is applied between the contacts, the first magnetic attraction force acting in a direction (upward) approximately 180 degrees opposite to the contact repulsive force works, so that the contact repulsive force is efficient. It can cancel well and can prevent the contact pressure from decreasing.

Further, the first 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 first 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 first yoke 52, it is possible to more reliably prevent a decrease in contact pressure between the contacts.

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 front end and the rear end of the first yoke 52 are provided in contact with the inner wall of the sealing container 31, so that the rotational force of the contact pressure spring 36 in the winding direction of the spring, etc. Even if it receives, rotation is prevented without providing a separate component. Here, in the present embodiment, the front and rear ends of the first yoke 52 is in contact with the inner wall of the sealing container 31, only a portion of the first yoke 52 abuts the inner wall of the sealing container 31 The first yoke 52 may be prevented from rotating in contact therewith.

Further, in the present embodiment, the contact portion 52, that is formed of a magnetic material, have been used as a yoke abutting portions having the functions of both the contact portion and the yoke, contact The portion 52 may be formed from 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 first yoke 52 and the third yoke 6 are formed in a substantially rectangular flat plate shape, each point on the surface of the first 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 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 are different only in the shape of the third yoke 7, and the structures common to the third embodiment are denoted by the same reference numerals and the description thereof 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 third yoke 7 of the present embodiment includes a base portion 7 a having a substantially rectangular flat plate shape and a pair of extending portions 7 b extending upward from both front and rear ends of the base portion 7 a. It is formed in a substantially U-shaped cross section.

  As shown in FIG. 10, when the contacts are conducted, the tip of the extending portion 7 b in the third yoke 7 is close to the first yoke 52, so that the first yoke 52 is compared with the first embodiment. The gap between the one yoke 52 and the third yoke 7 is reduced, and the third yoke 7 receives a stronger first magnetic attractive force from the first yoke 52. That is, a larger upward force is applied to the movable contact 35.

  Therefore, in the contact device of the present embodiment, the first magnetic attractive force acting between the first yoke 52 and the third yoke 7 is larger than that in the first embodiment, and is further 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 interruption performance while increasing the resistance to electromagnetic repulsion when a load is short-circuited, and the movable contact 35 is pressed toward the fixed contact 32 by the third yoke 7. Thus, the contact opening / closing performance is more stable.

  Further, 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 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.

  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.

In the present embodiment, the contact portion 52 is formed 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.

  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 3)
The contact device of this embodiment is demonstrated using FIG. Note that the contact device according to the present embodiment and the contact device according to the second embodiment are different only in the shape of the first yoke 53, and the structures common to the second embodiment are denoted by the same reference numerals and the description thereof is omitted. . 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.

  As shown in FIG. 11, 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.

  Then, as shown in FIG. 12, when the contacts are conducted, the tip surface of the extended portion 53b of the first yoke 53 is close to the tip surface of the extended portion 7b of the third yoke 7, The first magnetic attraction force acting between the first yoke 53 and the third yoke 7 is further increased. Furthermore, the first 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 first yoke 53 and the third yoke 7 can be reduced, and the first magnetic attraction force acting between the first yoke 53 and the third yoke 7 can be reduced more than in the second 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 according to the present embodiment has a stable arc breaking performance and an even more stable contact opening / closing performance while increasing the resistance to the electromagnetic repulsion force when the load is short-circuited.

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 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.

  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 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 4)
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.

  As shown in FIGS. 13 and 14, the contact device of this embodiment includes a fixed terminal 33 having 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 a movable contact. The first yoke 63 disposed to face the upper surface of the contactor 62, the third yoke 64 disposed to face the lower surface of the movable contactor 62, and the movable contactor 62 on the fixed contact 32 side. So that the contact pressure spring 65 for biasing, the holding member 66 for holding the first yoke 63, the movable shaft 67 connected to the holding member 66, and the movable contact 61 are in contact with and away from the fixed contact 32. An electromagnet block 2 for driving the movable shaft 67 and a pair of permanent magnets 46 are provided. Since the fixed contact 32, the fixed terminal 33, the electromagnet block 2, and the pair of permanent magnets 46 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 first yoke 63 is formed of a magnetic material such as soft iron and has a substantially U-shaped cross section, and 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 first 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 first yoke 63 via the movable contact 62. Then, the tips of the pair of extending portions 632 in the first yoke 63 face the upper surface of the third yoke 64, and the movable contact 62 is sandwiched between the first and third 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 first and third yokes 63 and 64 are disposed between the pair of holding portions 662, and the first yoke 63 has a pair of holding portions. 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 contacting the first 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 first yoke 63 held by the holding member 66 also moves upward, thereby releasing the restriction on the upward movement with respect to the movable contact 62. 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. As shown in FIG. 15, the first and third yokes 63 and 64 are connected to each other. A passing magnetic flux is formed. As a result, a magnetic attractive force is generated between the first and third yokes 63 and 64, and the third yoke 64 is attracted to the first 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 interrupting performance while increasing the resistance to electromagnetic repulsion when the load is short-circuited, and the third yoke 64 presses the movable contact 62 toward the fixed contact 32 side. Therefore, it has stable contact opening / closing performance.

  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 first yoke 63 held by the holding member 66 is separated from the movable contact 62. Here, for example, as shown in FIG. 16A, when a substantially flat yoke 63 ′ is used as the first 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 this embodiment, since the first 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 first 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 first 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. 17, the substantially U-shaped first yoke 63 has a facing area S <b> 1 with respect to the movable contact 62 and a facing area S <b> 2 with respect to the movable contact 62 of the flat third yoke 64. 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 first yoke 63 is longer than the magnetic path length L2 of the third yoke 64. Therefore, increasing the thickness of the first yoke 63 in the vertical direction increases the magnetic attraction 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.

  Further, the first 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 first yoke 63 on the fixed terminal 33 side in a substantially U shape, the magnetic attractive force with respect to the third yoke 64 can be increased efficiently. 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 first yoke 63 substantially U-shaped, the thickness of the first yoke 63 can be suppressed while maintaining the magnetic attractive 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.

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 Second yoke 51 Shaft 52 First Yoke (regulatory means)

Claims (16)

A contact block comprising a pair of fixed terminals having fixed contacts, and a movable contact in which a pair of movable contacts contacting and separating from the pair of fixed contacts are arranged in parallel on one surface;
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 ;
A contact device comprising: a third yoke disposed on the other surface side of the movable contact and facing the first yoke through the movable contact .   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 regulating means holds the first yoke, the movable contact, the third yoke, and the contact pressure spring, and regulates the movement of the movable contact toward the fixed contact through the first yoke. The contact device according to claim 3.   The contact block is housed in a container, and at least one of the first and third yokes is formed such that a part of an outer periphery thereof can contact an inner wall of the container. The contact device according to any one of 1 to 7.   9. The contact device according to claim 1, wherein at least one of the first and third yokes is formed in a flat plate shape.   The first 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. 9. The contact device according to claim 1, wherein the contact device is formed in a substantially U-shaped cross section.   11. The contact device according to claim 1, wherein the first yoke is formed thicker in the axial direction of the movable shaft than the third yoke.   The gap between the first and third yokes faces a side end portion of the movable contact when at least the movable contact and the fixed contact are in contact with each other. 11. The contact device according to any one of 11 above.   13. The third yoke according to any one of claims 1 to 12, 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.   13. The third yoke according to claim 1, 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.   The contact device according to claim 1, wherein the movable contact is provided integrally with the movable contactor or separately.

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