JP2011204477A - Contact device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact device in which a stable arc cut-off performance can be obtained, and size reduction is attained.SOLUTION: The contact device is provided with a contact block 3, consisting of a pair of fixed terminals 33 having a fixed contact 32 and a movable contactor 35 on which a pair of movable contacts 34 to contact and separate respectively from the pair of fixed contracts 32 are installed in a row in right and left direction on the upper face; a drive block consisting of an electromagnet block 2 and a movable shaft 5 to drive the movable contactor 35 so that the movable contacts 34 may contact and separate from the fixed contacts 32; a pair of permanent magnets 46, which are installed mutually facing via the contact block 3 in the front and rear direction and are magnetized along the facing direction; and a pair of first yokes 47, which are installed facing each end face of the movable contactor 35 in the arrangement direction of the movable contacts 34, and of which one connects the N poles of the pair of the permanent magnets 46 and the other connect the S poles of the pair of the permanent magnets 46.

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. The thing provided is provided (for example, refer patent document 1, 2).

  As shown in FIG. 20, the contact device having the magnetic blow structure includes a pair of fixed terminals 81 having a fixed contact 811 and a movable contact 82 having a pair of movable contacts 821 contacting and separating from the pair of fixed contacts 811. A contact block 8, 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.

  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.

  Moreover, the permanent magnet 9 is arrange | positioned facing each end surface of the movable contact 82 in the juxtaposition direction of the movable contact 821, and the mutually opposing surface has a different polarity. Thereby, regardless of the direction of the current flowing through the movable contact 82 in any of the longitudinal directions of the movable contact 82, the arc currents generated at each contact pair are stretched away from each other.

JP 2009-199893 A JP 2004-71512 A

  However, in the contact device shown in Patent Document 2, since the pair of permanent magnets 9 are respectively disposed opposite to the end faces of the movable contact 82 in the direction in which the movable contacts 821 are arranged in parallel, There is a problem that the contact device becomes large.

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

  In order to solve the above-mentioned problem, a first invention is a contact comprising a pair of fixed terminals having a fixed contact, and a movable contact in which a pair of movable contacts respectively contacting and separating from the pair of fixed contacts are arranged side by side. A block, a drive block for driving the movable contact so that the movable contact comes in contact with and away from the fixed contact, a direction in which the movable contacts are arranged in parallel, and a direction in which the movable contact and the fixed contact are separated from each other A pair of permanent magnets which are provided opposite to each other via the contact block in the direction and are magnetized along the facing direction, and facing each end face of the movable contact in the direction in which the movable contacts are arranged side by side And a pair of first yokes that connect the N poles of the pair of permanent magnets and the other connect the S poles of the pair of permanent magnets.

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

  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.

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

  According to a fifth invention, in the third or fourth invention, the movable shaft is provided at a shaft portion movably inserted in an insertion hole formed in the movable contact, and at one end of the shaft portion. It is comprised from the contact part contact | abutted to one surface of the said movable contact.

  According to a sixth aspect, in the fifth aspect, the second yoke also serves as a contact portion of the movable shaft.

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

  In an eighth aspect based on the fourth aspect, the regulating means holds the second yoke, the movable contactor, the third yoke, and the contact pressure spring, and the second yoke, The movement of the movable contact to the fixed contact side is restricted.

  According to a ninth invention, in any one of the fourth to eighth inventions, the contact block is housed in a container, and the first and third yokes each have at least a part of the outer periphery on the inner wall of the container. It contacts, It is characterized by the above-mentioned.

  According to a tenth invention, in the second or third invention, the second yoke is formed in a flat plate shape.

  An eleventh invention is characterized in that, in any of the fourth to ninth inventions, at least one of the second and third yokes is formed in a flat plate shape.

  In a twelfth aspect based on the second or third aspect, the second yoke extends from the end portion of the base portion facing the movable contact toward the movable contact. It is characterized by being formed in a substantially U-shaped cross section from a pair of extending portions.

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

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

  In a fifteenth aspect based on any one of the twelfth to fourteenth aspects, 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.

  According to a sixteenth aspect of the present invention, in any one of the first to fifteenth aspects, the polarity of the surface facing the first yoke connecting the north poles of the pair of permanent magnets is the south pole, and the pair of permanent magnets is S. A permanent magnet piece is provided between the pair of first yokes so that the polarity of the surface facing the first yoke connecting the poles is N poles.

  In a seventeenth aspect based on any one of the fourth to sixteenth aspects, the third yoke has a groove portion into which one end of the contact pressure spring is fitted on a surface opposite to a surface that contacts the movable contact. It is formed.

  In an eighteenth aspect based on any one of the fourth to sixteenth aspects, the third yoke has a protrusion that fits into one end of the contact pressure spring on a surface opposite to a surface that contacts the movable contact. Is formed.

  A nineteenth invention is characterized in that, in any one of the first to eighteenth inventions, the fixed contact is provided integrally with the fixed terminal or separately.

  In a twentieth aspect of the invention according to any one of the first to nineteenth aspects, the movable contact is provided integrally with the movable contactor or separately.

  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 2nd 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. The principal part enlarged view in another form of the contact device 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. The principal part enlarged view of the contact apparatus in Embodiment 5 of this invention is shown. Sectional drawing of the contact apparatus in a prior art example is shown.

  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. The driving means is composed of the block 2, a pair of permanent magnets 46 for extinguishing the arc generated in the contact block 3 in a short time, and a first yoke 47 connecting the pair of permanent magnets 46. Contact device It is.

  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 second yoke 52. A shaft portion 51 is connected to the center of the lower surface of the second yoke 52, and the shaft portion 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 second 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 longitudinal direction of the movable contact 35. Here, the permanent magnet 46 is disposed on the front side and the rear side of the movable contact 35 so as to face each other via a gap (contact gap) between the fixed contact 32 and the movable contact 34, and a pair of opposed magnets 46. The permanent magnets 46 have opposite polarities on opposite surfaces. Specifically, the pair of permanent magnets 46 are both magnetized along the front-rear direction, the front surface is N-pole and the rear surface is S-pole, and the rear surface (S-phase) of the front permanent magnet 46 and the rear Of the permanent magnets 46 are opposed to each other.

  The first yoke 47 is provided to face each end face in the longitudinal direction of the movable contact 35 and connects between the pair of permanent magnets 46. The first yoke 47 extends from the both ends of the base 47a facing the end face in the longitudinal direction of the movable contact 35 and substantially perpendicular to the base 47a and is connected to the pair of permanent magnets 46, respectively. It is formed in a substantially U shape from a pair of extending portions 47b. Here, one (left side) first yoke 47 connects the N poles of the pair of permanent magnets 46, and the other (right side) permanent magnet 46 connects the S poles of the pair of permanent magnets 46. . That is, one first yoke 47 connects the front surfaces (N pole surfaces) of the pair of permanent magnets 46, and the other first yoke 47 connects the rear surfaces (S pole surfaces) of the pair of permanent magnets 46. ) Are connected.

  In the contact device of this embodiment, when the movable shaft 37 is moved upward by the electromagnet block 2, the restriction of the movable contact 35 toward the fixed contact 32 is released, and the movable contact 35 is connected to the contact pressure spring 37. It moves to the fixed contact 32 side by the urging force. As a result, the movable contact 34 comes into contact with the fixed contact 32 and the contacts are conducted. Here, when the contacts come in and out, an arc is generated at each contact portion.

  Here, as shown in FIG. 2, the pair of permanent magnets 46 and the pair of first yokes 47 generate magnetic fluxes from the left first yoke 47 to the right first yoke 47 around the contact block 3. It is formed. For this reason, the arc generated between the fixed contact 32 and the movable contact 34 (between the contacts) is stretched away from each other and extinguished regardless of the direction of the current flowing through the movable contact 35. The Specifically, in FIG. 2, when current flows from the left to the right through the movable contact 35, the arc generated between the left contacts is stretched forward, and the arc generated between the right contacts is stretched backward. Short circuit of arc current can be prevented. In FIG. 2, when 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 to generate an arc current. Can be prevented. In addition, the number 31 in FIG. 2 shows the sealing container 31 mentioned later.

  Therefore, the contact device of the present embodiment can obtain a stable arc breaking performance regardless of the direction in which the current flows.

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

  Further, as shown in FIG. 3, a second yoke 52 is provided between the pair of permanent magnets 46 and is disposed substantially parallel to the pair of permanent magnets 46 and abuts against the upper surface of the movable contact 35. That is, the second yoke 52 is disposed in the magnetic flux generated by the pair of permanent magnets 46, and the magnetic flux from the left first yoke 47 to the right first yoke 47 is applied to the second yoke 52. It is drawn and relayed. Therefore, the leakage flux between the pair of first yokes 47 is suppressed by the second yoke 52, the magnetic flux density in the vicinity of each contact portion is improved, the force for extending the arc current is increased, and the arc interruption performance is further improved. Can be made. That is, the magnetic flux generated between the pair of permanent magnets 46 can be efficiently guided to the vicinity of the contact portion by the second yoke 52.

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

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

  Here, the first magnetic attraction force acting between the second yoke 52 and the third yoke 6 exerting an upward force on the movable contact 35 is a contact repulsive force (downward) generated on the movable contact 35. (Force) is a force in the opposite direction of about 180 degrees, and is therefore a force that works in the direction that cancels the contact repulsive force most efficiently.

  Therefore, the contact device according to the present embodiment can increase the resistance to electromagnetic repulsion when a load is short-circuited while achieving downsizing, has a stable arc breaking performance, and a more stable contact switching performance. Can be obtained. In the present embodiment, the polarities of the opposed surfaces of the pair of permanent magnets 46 are different from each other, but the polarities of the opposed surfaces of the pair of permanent magnets 46 are the same as shown in FIG. There may be.

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

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

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

  As shown in FIGS. 6 (a), (b), 7 (a), (b), and FIGS. 8 (a) to (c), the electromagnetic relay includes an electromagnetic block in a hollow box type case 4. (Drive means) The internal unit block 1 configured by integrally combining the contact block 2 and the contact block 3 is accommodated. Hereinafter, the vertical and horizontal directions in FIG. 6A are used as a reference, and the direction perpendicular to the vertical and horizontal directions is the front and rear direction.

  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. A contact pressure spring 36 that contacts the lower surface of the yoke 6 and the third yoke 6 and biases the third yoke 6 and the movable contact 35 toward the fixed contact 33, 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. 8C, the excitation winding 22 is connected to a pair of terminal portions 121 provided on the flange portion 21 a of the coil bobbin 21, and ends thereof are connected via lead wires 122 connected to the terminal portions 121. A pair of coil terminals 23 are connected to each other.

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

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

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

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

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

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

  The movable shaft 5 includes a shaft portion 51 that is formed from a nonmagnetic material in the shape of a long round bar that is long in the vertical direction, and a hook-shaped contact portion 52 that is integrally formed with the shaft portion 51 at the upper end of the shaft portion 51. Second 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 second 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 second yoke has a function of a contact portion that restricts movement of the movable contact 35 and a function of the yoke.

  The movable contact 35 is fixed to the left and right ends of the upper surface of the main body 35a formed in a substantially rectangular plate 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.8 (a), the end of the flange 38 is joined to the opening periphery of the sealing container 31 by brazing. The sealed container 31 is sealed by joining the other end of the flange 38 to the first yoke plate 26A by brazing.

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

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

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

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

  The permanent magnets 46 are formed in a substantially rectangular parallelepiped shape and are respectively disposed on the front side and the rear side of the sealing container 31 so as to face each other via the sealing container 31, and the polarities of the faces facing each other are different. ing. Here, the pair of permanent magnets 46 oppose each other via a contact gap between the fixed contact 32 and the movable contact 34 in the sealing container 31.

  The first yoke 47 includes a substantially rectangular plate-like base portion 47a and a pair of extending portions 47b extending from the front and rear ends of the base portion 47a in the left-right direction substantially perpendicularly to the base portion 47a. And are disposed on both the left and right side surfaces of the sealing container 31, respectively. The base portion 47 a is provided in contact with the left and right side surfaces of the sealing container 31, and the pair of extending portions 47 b are connected to the pair of permanent magnets 46 to connect the pair of permanent magnets 46. Here, one (left side) first yoke 47 connects the N poles of the pair of permanent magnets 46, and the other (right side) permanent magnet 46 connects the S poles of the pair of permanent magnets 46. . That is, one first yoke 47 connects the front surfaces (N pole surfaces) of the pair of permanent magnets 46, and the other first yoke 47 connects the rear surfaces (S pole surfaces) of the pair of permanent magnets 46. ) Are connected. Therefore, the sealing container 31 is sandwiched between the first (left) first yoke 47 from the front-rear direction, and the pair of permanent magnets 46 are sandwiched from the front-rear direction by the extending portions 47 b of the pair of first yokes 47. It is.

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

  The case main body 41 is provided with a protrusion 141 formed with an insertion hole 141a used for fixing the electromagnetic relay to the mounting surface by screwing at the front ends of the left and right side walls. Further, a step portion 41 a is formed at the opening periphery of the upper end side of the case body 41, and the outer periphery is smaller than the lower end side. A pair of slits 41b into which the terminal portion 23b of the coil terminal 23 is fitted is formed on the front surface above the step portion 41a. Further, a pair of concave portions 41c are arranged in the left-right direction on the rear surface above the step portion 41a.

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

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

  In the electromagnetic relay 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 moves downward as the contact portion 37a 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 abutting portion 37a 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, thereby being fixed to the movable contact 35. The movable contact 34 is brought 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, the electromagnetic relay has a stable arc breaking performance and a stable contact switching performance.

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

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

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

  In the electromagnetic relay, the second yoke 52 of the movable shaft 5 comes close to the upper surface of the movable contact 35 when the contacts are conducted. Accordingly, the second yoke 52 is in proximity to the third yoke 6 fixed to the movable contact 35, and between the second 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 is possible to cancel well, and it is possible to prevent problems such as a decrease in contact pressure and contact welding due to an arc at the time of contact opening.

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

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

  As shown in FIG. 9, the front end and the rear end of the second 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 this embodiment, the front end and the rear end of the second yoke 52 are in contact with the inner wall of the sealing container 31, but only a part of the second yoke 52 contacts the inner wall of the sealing container 31. The second yoke 52 may be prevented from rotating in contact therewith.

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

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

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

(Embodiment 2)
The contact device of this embodiment is demonstrated using FIG. The contact device according to the present embodiment and the contact device according to the first embodiment are different only in the shape of the third yoke 7, and the structures common to those in the first 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. 10 and the direction orthogonal to the vertical and horizontal directions as the front and rear direction.

  As shown in FIG. 10, the third yoke 7 of the present embodiment includes a base portion 7a having a substantially rectangular flat plate shape and a pair of extended portions 7b extending upward from both front and rear ends of the base portion 7a. It is formed in a substantially U-shaped cross section.

  As shown in FIG. 11, when the contacts are conducted, the tip of the extended portion 7 b in the third yoke 7 is close to the second yoke 52, so that the first yoke is compared with the first embodiment. The gap between the second yoke 52 and the third yoke 7 is reduced, and the third yoke 7 receives a stronger first magnetic attractive force from the second yoke 52. That is, a larger upward force is applied to the movable contact 35.

  Therefore, in the contact device of the present embodiment, the first magnetic attractive force acting between the second yoke 52 and the third yoke 7 is larger than that in the first embodiment, and the upward force is further increased 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 arc breaking performance is improved by providing the pair of permanent magnets 46, and the movable contact 35 is further strengthened by the first magnetic attraction force from the third yoke 7. Is received and sucked to the fixed contact 32 side. That is, the contact device of the present embodiment has a stable arc breaking performance and a stable contact switching performance while increasing the resistance to electromagnetic repulsion when a load is short-circuited.

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

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

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

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

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

(Embodiment 3)
The contact device of this embodiment will be described with reference to FIG. The contact device of the present embodiment and the contact device of the second embodiment are different only in the shape of the second yoke 53, and the structure common to the second embodiment is denoted by the same reference numeral and the description thereof is omitted. . The description will be made with reference to the vertical and horizontal directions in FIG. 12 and the direction orthogonal to the vertical and horizontal directions as the front and rear direction.

  As shown in FIG. 12, the second yoke 53 of the present embodiment includes a substantially rectangular flat plate-like base portion 53a and a pair of extending portions 53b extending downward from both front and rear ends of the base portion 53a. It is formed in a substantially U-shaped cross section.

  As shown in FIG. 13, when the contacts are conducted, the tip surface of the extending portion 53 b of the second yoke 53 is close to the tip surface of the extending portion 7 b of the third yoke 7, The first magnetic attractive force acting between the second yoke 53 and the third yoke 7 is further increased. Further, the second yoke 53 is set by setting the gap between the distal end surface of the extending portion 53 b and the distal end surface of the extending portion 7 b so as to face the substantially center of the side end portion of the movable contact 35. The leakage magnetic flux generated from the gap between the second yoke 53 and the third yoke 7 can be reduced, and the first magnetic attraction force acting between the second yoke 53 and the third yoke 7 can be reduced more than in the 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 movable contact 35 is pressed from the third yoke 7 to the fixed contact 32 side with a stronger force than in the third embodiment. That is, the contact device of the present embodiment can increase the resistance to electromagnetic repulsion when a load is short-circuited, has a stable arc breaking performance, and can obtain a more stable contact switching performance.
Here, since the first magnetic attraction force is a contact repulsive force (downward force) generated in the movable contact 35, the contact repulsive force is a force (upward force) that is approximately 180 degrees in the opposite direction. It is the force that works in the direction to counteract the most efficiently.

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

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

  In the present embodiment, the second yoke 53 is formed of a magnetic material and is used as a yoke contact portion having both functions of the contact portion and the yoke. 53 may be formed of a non-magnetic material, and a yoke may be provided separately. In that case, the second yoke 53 is provided at substantially the center of the pair of fixed terminals 33 and is substantially opposed 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 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.

  As shown in FIGS. 14 and 15, the contact device according to the present 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 second 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 holding the second yoke 63, the movable shaft 67 connected to the holding member 66, and the movable contact 61 come 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, the pair of permanent magnets 46, and the pair of first yokes 47 are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

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

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

  The third yoke 64 is formed in a substantially rectangular plate shape from a magnetic material such as soft iron, is fixed to the lower surface of the movable contact 62, and faces the second yoke 63 via the movable contact 62. Then, the tips of the pair of extending portions 632 in the second yoke 63 face the upper surface of the third yoke 64, and the movable contact 62 is sandwiched between the second 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 second and third yokes 63 and 64 are disposed between the pair of sandwiching portions 662, and the second yoke 63 is sandwiched between the pair of sandwiching portions 662. Held by the portion 662.

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

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

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

  Here, when the contacts are conducted and a current flows through the movable contact 62, a magnetic field is generated around the movable contact 62. As shown in FIG. 16, the second 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 second and third yokes 63 and 64, and the third yoke 64 is attracted to the second yoke 63. Therefore, the third yoke 64 presses the lower surface of the movable contact 62, and an upward force that presses the movable contact 62 toward the fixed contact 32 side works.

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

  Therefore, the contact device of the present embodiment can increase the resistance to electromagnetic repulsion when the load is short-circuited, has a stable arc interruption performance, and the third yoke 64 connects the movable contactor 62 to the fixed contact 32 side. It has a stable contact opening and 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 second yoke 63 held by the holding member 66 is separated from the movable contact 62. Here, for example, as shown in FIG. 17A, when a substantially flat yoke 63 ′ is used as the second yoke and a substantially U-shaped yoke 64 ′ is used as the third yoke, the yoke Since the magnetic path 63 ′ and the magnetic path of the yoke 64 ′ are not continuous, a leakage magnetic flux is generated between the yoke 63 ′ and the yoke 64 ′.

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

  Further, as shown in FIG. 18, the substantially U-shaped second yoke 63 has a facing area S1 with respect to the movable contact 62 so that a facing area S2 with respect to the movable contact 62 of the flat plate-like 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 second yoke 63 is longer than the magnetic path length L2 of the third yoke 64. Therefore, increasing the thickness of the second yoke 63 in the vertical direction increases the magnetic attractive force acting on the third yoke 64 more effectively than increasing the thickness of the third yoke 64 in the vertical direction. be able to.

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

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

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

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

(Embodiment 5)
The contact device of this embodiment will be described with reference to FIG. In addition, the contact device of this embodiment is a contact device according to any one of Embodiments 1 to 7, in which a permanent magnet piece 48 is disposed between a pair of permanent magnets 46. In addition, even if it is a case where the permanent magnet 48 is provided in any contact device of Embodiment 1 thru | or 7, since the same effect can be acquired, in this actual embodiment, it is a permanent magnet piece in the contact device of Embodiment 1. The case where 48 is provided will be described. Hereinafter, the description will be made with reference to the vertical and horizontal directions in FIG.

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

  In the permanent magnet piece 48, the polarity of the surface facing the first yoke 47 connected to the N pole face of the pair of permanent magnets 46 is the S pole, and the first pole connected to the S pole face of the pair of permanent magnets 46. It arrange | positions so that the polarity of the surface which opposes the yoke 47 may become N pole. That is, the left side surface of the permanent magnet piece 48 is the S pole and the right side surface is the N pole. Therefore, the magnetic flux from the left first yoke 47 to the right first yoke 47 through the vicinity of each contact portion is attracted to the permanent magnet piece 48 between the pair of first yokes 47, and the permanent magnet 46. Relayed by.

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

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

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

Claims (20)

A contact block comprising a pair of fixed terminals having fixed contacts, and a movable contact in which a pair of movable contacts contacting and separating from the pair of fixed contacts are arranged in parallel on one surface;
A drive block for driving the movable contact so that the movable contact is in contact with and away from the fixed contact;
A pair of magnets arranged opposite to each other through the contact block in the direction in which the movable contacts are arranged side by side and in the direction perpendicular to the contact / separation direction of the movable contact and the fixed contact, and magnetized along the facing direction. With permanent magnets,
Provided opposite each end face of the movable contact in the direction in which the movable contacts are arranged, one connected between the N poles of the pair of permanent magnets and the other connected between the S poles of the pair of permanent magnets. And a pair of first yokes.   The contact device according to claim 1, wherein a second yoke is provided to face one surface of the movable contact.   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.   4. The contact device according to claim 1, further comprising a third yoke that abuts against the other surface of the movable contact and faces the second yoke through the movable contact.   The movable shaft includes a shaft portion that is movably inserted 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 or 4, wherein   The contact device according to claim 5, wherein the second yoke also serves as a contact portion of the movable shaft.   The contact device according to claim 5 or 6, wherein the second 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 second yoke, the movable contact, the third yoke, and the contact pressure spring, and restricts the movement of the movable contact toward the fixed contact through the second yoke. The contact device according to claim 4, wherein:   The contact according to claim 4, wherein the contact block is housed in a container, and at least a part of the outer periphery of each of the second and third yokes abuts against an inner wall of the container. apparatus.   4. The contact device according to claim 2, wherein the second yoke is formed in a flat plate shape.   10. The contact device according to claim 4, wherein at least one of the second and third yokes is formed in a flat plate shape.   The second yoke has a substantially U-shaped cross section from a flat plate-like base portion facing the movable contact and a pair of extended portions extending from the end of the base toward the movable contact. The contact device according to claim 2, wherein the contact device is formed as follows.   The second and third yokes each have at least one of a flat base portion facing the movable contact, and a pair of extending portions extending from the end of the base toward the movable contact. The contact device according to claim 4, wherein the contact device is formed in a substantially U-shaped cross section.   14. The contact device according to claim 4, wherein the second yoke is formed thicker in the axial direction of the movable shaft than the third yoke.   The gap between the second and third yokes faces the side end of the movable contact when at least the movable contact and the fixed contact abut. 14. The contact device according to any one of 14.   The polarity of the surface facing the first yoke connecting the N poles of the pair of permanent magnets is S pole, and the polarity of the surface facing the first yoke connecting the S poles of the pair of permanent magnets is N 16. The contact device according to claim 1, further comprising a permanent magnet piece disposed between the pair of first yokes so as to form a pole.   17. The third yoke according to any one of claims 4 to 16, wherein a groove portion into which one end of the contact pressure spring is fitted is formed on a surface opposite to a surface contacting the movable contact. Contact device.   17. The projection according to claim 4, wherein the third yoke has a protrusion that fits into one end of the contact pressure spring on a surface opposite to a surface that contacts the movable contact. Contact device.   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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