JP2012199126A - Contact device and electromagnetic switching device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact device suppressing reduction in contact pressure acting between contacts and also to provide an electromagnetic switching device using the contact device.SOLUTION: The contact device includes: fixed contacts 1A, 1B; a movable contactor 4; a first yoke 11; a second yoke 12; and a displacement suppressing mechanism. The movable contactor 4 has movable contacts 3A, 3B which come into contact with and are separated from the fixed contacts 1A, 1B, respectively, and a current is made to flow in a second direction intersecting with a first direction where the corresponding contacts are opposed to each other. The first yoke 11 and the second yoke 12 are opposed to each other while sandwiching the movable contactor 4 in the first direction and the yoke 11 is held at a predetermined position at the time of closing an electrode. The displacement suppressing mechanism comprises a protruding part 14 provided at the first yoke 11 and a recessed part 17 engaged with the protruding part 14 provided at the second yoke 12, and suppresses the relative displacement between both yokes 11, 12 in the direction crossing the direction where the first yoke 11 and the second yoke 12 are opposed to each other.

Description

  The present invention relates to a contact device and an electromagnetic switching device using the contact device.

  Conventionally, an electromagnetic switching device that opens and closes an electric circuit is known. For example, there is a device disclosed in Patent Document 1. FIG. 10 is a diagram schematically showing a contact portion of the electromagnetic switching device disclosed in Patent Document 1, in which two fixed terminals 101 provided with fixed contacts 100 and the corresponding fixed contacts 100 are respectively contacted. Alternatively, the movable contact 102 is provided with two movable contacts that are separated from each other. The movable contact 102 is driven by an electromagnet block (not shown), and each movable contact contacts or separates from the corresponding fixed contact 100. The movable contact 102 is arranged in a direction substantially orthogonal to the direction in which the fixed contact 100 and the movable contact are in contact.

  When the two movable contacts included in the movable contact 102 come into contact with the corresponding fixed contacts 100, the current I flows from the one fixed terminal 101 through the movable contact 102 to the other fixed terminal 101. At this time, a magnetic field B directed from the back side of the sheet of FIG. 10 to the near side is generated by the current I flowing through the U-shaped electric circuit, and this magnetic field B causes the Lorentz force (electromagnetic field) downward in FIG. (Repulsive force) acts. This Lorentz force acts in a direction to move the movable contact 102 away from the fixed contact 100, and acts to reduce the contact pressure between the fixed contact 100 and the movable contact.

  The electromagnetic switching device disclosed in Patent Document 1 has the following configuration in order to suppress a decrease in contact pressure due to the Lorentz force described above. In this electromagnetic switchgear, a shaft portion provided with a contact portion at the tip thereof is inserted into the insertion hole provided in the movable contact, and the shaft portion is advanced and retracted by an electromagnet block. Thus, the movable contact is brought into contact with or separated from the fixed contact. The contact portion made of a magnetic material provided on the shaft portion is used as the first yoke, and the second yoke is fixed to the surface of the movable contact opposite to the contact portion. When a magnetic field is generated around the movable contact due to a current flowing through the movable contact when energized, a magnetic flux passing through the first yoke and the second yoke is generated, and a magnetic attractive force is generated between both yokes. The magnetic attractive force acts in the direction to cancel the electromagnetic repulsive force, and the decrease in contact pressure is suppressed.

JP 2011-23332 A

  In the electromagnetic switching device of Patent Document 1 described above, since the shaft portion provided with the first yoke is passed through the insertion hole of the movable contact, there is no gap provided between the shaft portion and the insertion hole. There is a possibility that the position of the movable contact with respect to the first yoke is shifted by the amount. When the position of the movable contact is shifted, the relative position between the second yoke fixed to the movable contact and the first yoke is shifted, and a leakage magnetic flux is generated, and the first yoke and the second yoke are generated. There is a possibility that the magnetic attractive force generated between the two will decrease. When this magnetic attractive force is reduced, the effect of canceling the electromagnetic repulsion force is reduced, and there is a possibility that a gap will be generated between the movable contact and the fixed contact, resulting in arc discharge. There was also the possibility of adverse effects.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a contact device that suppresses a decrease in contact pressure acting between the contacts, and an electromagnetic switching device using the contact device.

  The contact device of the present application includes a fixed contact, a movable contact, a first yoke, a second yoke, and a positional deviation suppression mechanism. The movable contact has a movable contact that contacts and separates from the fixed contact, and allows a current to flow in a second direction that intersects the first direction in which both contacts are opposed. The first yoke and the second yoke are opposed to each other with the movable contact in the first direction, and one of them is held at a predetermined position when the pole is closed. The misregistration suppression mechanism suppresses a relative misalignment between the first yoke and the second yoke in a direction intersecting the direction in which the first yoke and the second yoke are opposed to each other.

  In this contact device, the movable contact includes a first movable contact and a second movable contact provided on one surface of the movable contact, and the fixed contact includes a first fixed contact that contacts the first movable contact; It is also preferable to have a second fixed contact that contacts the second movable contact. In this contact device, a current flows from one of the first fixed contact and the second fixed contact to the other through the movable contact.

  In this contact device, the positional deviation suppressing mechanism is provided on the engaged portion provided on one of the first yoke and the second yoke and on the other of the first yoke and the second yoke, and is engaged with the engaged portion. It is also preferable to have a mating engagement portion.

  In this contact device, the engaging portion is provided on one of the first yoke and the second yoke, and includes a convex portion protruding toward the other yoke, and the engaged portion is provided on the other yoke. It is also preferable that the convex portion is formed by a concave portion with which the convex portion is engaged.

  In this contact device, it is also preferable that inclined surfaces are provided on the end surfaces of the concave portion and the convex portion, respectively.

  The electromagnetic switching device of the present application has any of the contact devices described above and a coil, and the movable contact is brought into contact with or separated from the fixed contact by driving the movable contact depending on whether the coil is energized or not. And an electromagnet device.

  According to the present invention, it is possible to suppress a decrease in contact pressure acting between the contact points, and it is possible to reduce a possibility that arc discharge occurs due to a gap generated between the contact points due to the decrease in contact pressure.

The electromagnetic switching device of Embodiment 1 is shown, (a) is a front view of a contact part, (b) is a top view of a contact part, (c) is a left side view of a contact part. It is sectional drawing same as the above. The other form same as the above is shown, (a) is a front view of the contact portion, (b) is a top view of the contact portion. The other form same as the above is shown, (a) is a front view of the contact portion, (b) is a top view of the contact portion. The other form same as the above is shown, (a) is a front view of the contact portion, (b) is a top view of the contact portion. The other form same as the above is shown, (a) is a cross-sectional view of the contact portion viewed from the front side, (b) is a perspective view of the contact portion. The principal part of the electromagnetic switching device of Embodiment 2 is shown, (a) is sectional drawing at the time of opening, (b) is sectional drawing at the time of closing. It is sectional drawing same as the above. The other form same as the above is shown, (a) is a front view of the contact portion, (b) is a top view of the contact portion, and (c) is a sectional view of the contact portion. It is a schematic plan view which shows the contact part of the conventional electromagnetic switching apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
The contact device and electromagnetic switching device of Embodiment 1 will be described with reference to FIGS. In the following description, the upper and lower directions and the left and right directions in FIG. Note that the direction shown in FIG. 2 does not define the vertical and horizontal directions in the actual use state, and the mounting direction in actual use is not limited to the direction shown in FIG.

  The contact device C1 of the present embodiment includes fixed terminals 2A and 2B each having fixed contacts 1A and 1B, a movable contact 4, a first yoke 11, and a second yoke 12. The contact device C1 and the electromagnet device C2 for driving the movable contact 4 are housed in a housing 43 made of a resin molded product, and an electromagnetic switching device is configured as a whole.

  The fixed terminal 2A is formed in a substantially cylindrical shape by a conductive material such as a copper alloy, and a fixed contact 1A is fixed to the lower end thereof. The upper portion of the fixed terminal 2A is provided with a flange portion 6 having a diameter larger than that of the lower portion, and an electric wire (not shown) from a load is connected to the flange portion 6 using an appropriate method. It is like that. The fixed terminal 2B is also formed in a substantially cylindrical shape by a conductive material such as a copper alloy, and the fixed contact 1B is fixed to the lower end thereof. Since the fixed terminal 2B has the same configuration as the fixed terminal 2A except for the fixed contact 1B, the same reference numerals are given to the common configurations, and the description thereof is omitted. The fixed contacts 1A and 1B are preferably formed of a material having a lower electrical resistance than the material forming the fixed terminals 2A and 2B in order to reduce the contact resistance.

  The movable contact 4 is formed in a flat plate shape that is long in the left-right direction by a conductive material such as a copper alloy. On the upper surface of the movable contact 4, a movable contact 3 </ b> A that contacts and separates the fixed contact 1 </ b> A is fixed to one end side in the left-right direction (left side in FIG. 2) and fixed contact to the other end in the left-right direction (right side in FIG. 2) A movable contact 3B to which 1B contacts and separates is fixed. In the movable contact 4, a hole 5 that penetrates the movable contact 4 in the thickness direction (vertical direction in FIG. 2) is formed at an intermediate position between the movable contacts 3 </ b> A and 3 </ b> B. The movable contacts 3A and 3B are preferably formed of a material having a lower electrical resistance than the material forming the movable contact 4 in order to reduce the contact resistance.

  The first yoke 11 is formed in a substantially rectangular plate shape with a magnetic material, and is disposed to face the upper surface of the movable contact 4. A hole 13 that penetrates the first yoke 11 in the thickness direction (vertical direction in FIG. 2) is formed at a position corresponding to the hole 5 of the movable contact 4 at the approximate center of the first yoke 11. Both side portions of the first yoke 11 in the front-rear direction protrude to the outside of the movable contact 4, and convex portions 14 that protrude toward the lower side (that is, the second yoke 12) from the protruding portions on the left and right sides. Is provided.

  The second yoke 12 is formed in a substantially rectangular plate shape by a magnetic material, and is disposed to face the lower surface of the movable contact 4. In the direction in which the movable contacts 3A and 3B are opposed to the corresponding fixed contacts 1A and 1B. It faces the first yoke 11 with the movable contact 4 interposed therebetween. A hole 15 penetrating through the second yoke 12 in the thickness direction (vertical direction in FIG. 2) is formed at a position corresponding to the hole 5 of the movable contact 4 also in the approximate center of the second yoke 12. Both side portions of the second yoke 12 in the front-rear direction are extended to the outside of the movable contact 4, and side pieces 16, 16 projecting upward from the protruding portions on the left and right sides are provided, respectively. 16 is provided with a concave portion 17 with which the convex portion 14 is engaged.

  In this contact device C 1, the contact portion including the fixed contacts 1 A and 1 B and the movable contact 4 is sealed in the case 40. The case 40 is formed in a box shape whose bottom surface is opened by a heat resistant material such as ceramic. The upper wall of the case 40 is provided with round holes 41a and 41b into which the fixed terminals 2A and 2B are inserted, respectively. The fixed terminals 2A and 2B are inserted into the corresponding round holes 41a and 41b with the fixed contacts 1A and 1B facing downward, respectively, and are joined by brazing the flange 6 to the periphery of the round holes. One end side of a joining member 42 formed in a cylindrical shape with a metal material is joined to the periphery of the opening of the case 40 by brazing. The other end of the joining member 42 is joined to the upper surface of the first yoke 26 by brazing. Further, the first yoke 26 is provided with a hole through which a drive shaft 30 described later is passed, and a bottomed cylindrical tube body 28 is joined to the lower surface of the first yoke 26 around the hole by brazing. Yes. Here, the space surrounded by the case 40, the joining member 42, the first yoke 26, and the cylindrical body 28 is airtight, and the airtight space includes a contact portion including the fixed contacts 1 </ b> A and 1 </ b> B and the movable contact 4. Is stored and a gas mainly composed of hydrogen is enclosed. As described above, since the contact portion is housed in an airtight space in which a gas mainly composed of hydrogen is sealed, even if an arc is generated when the contact portion is opened, the arc is rapidly cooled by the sealed gas. Therefore, the possibility that the high heat of the arc adversely affects the contact portion can be reduced. In the present embodiment, the storage space of the contact portion is kept airtight, and a cooling gas such as hydrogen or nitrogen is sealed in this storage space, but the storage space of the contact portion is not necessarily kept airtight. There is no.

  Next, the electromagnet device C2 that drives the movable contact 4 will be described. The electromagnet device C <b> 2 includes a coil bobbin 21, a coil 22, a fixed iron core 23, a movable iron core 24, a yoke 25, and a return spring 29.

  The coil bobbin 21 is made of a synthetic resin molded product, and includes a cylindrical winding drum portion 21a and plate-like flanges 21b provided at both ends of the winding drum portion 21a. The coil 22 is interposed between the flanges 21b at both ends. It is wound. A cylindrical body 28 having an upper portion fixed to the fixed iron core 23 is disposed inside the winding drum portion 21a.

  The fixed iron core 23 is formed in a substantially cylindrical shape from a magnetic material, and is disposed on the upper end side in the cylindrical body 28.

  The movable iron core 24 is formed in a substantially cylindrical shape from a magnetic material, and is arranged on the lower end side in the cylindrical body 28 so as to be movable in the vertical direction (axial direction). That is, the movable iron core 24 is opposed to the fixed iron core 23 in the cylinder 28 in the axial direction of the cylinder 28. The movable iron core 24 always receives a downward elastic force by the return spring 29.

  The yoke 25 is configured by combining the first yoke 26 and the second yoke 27.

  The first yoke 26 is formed in a substantially flat plate shape from a magnetic material and is disposed on the upper side of the coil bobbin 21. The upper part of the fixed iron core 23 is fitted in the hole opened in the center of the upper surface of the first yoke 26, and the fixed iron core 23 is positioned in the vertical direction.

  The second yoke 27 is formed by bending a strip of magnetic material into a U-shape, and has a lower piece 27a that contacts the lower end of the coil bobbin 21, and protrudes upward from the left and right ends of the lower piece 27a. And side pieces 27b and 27c arranged integrally with each other. The lower piece 27a is provided with a hole through which the lower portion of the cylindrical body 28 is passed, and a protruding piece 27d is provided that protrudes upward from the left and right sides of the hole. Further, the tips of the left and right side pieces 27 b and 27 c are in contact with the lower surface of the first yoke 26.

  One end of a drive shaft 30 that moves the movable contact 4 up and down is attached to the movable iron core 24. The drive shaft 30 includes a round bar-shaped shaft portion 31 made of a magnetic material such as soft iron, and a flange portion 32 that protrudes in the radial direction from the upper end of the shaft portion 31. The shaft portion 31 of the drive shaft 30 is press-fitted into the hole 13 of the first yoke 11, and the first yoke 11 is fixed to the upper end position of the shaft portion 31. The shaft portion 31 of the drive shaft 30 is inserted into the hole 5 of the movable contact 4 and the hole 15 of the second yoke 12, respectively, and then passed through the center hole of the contact pressure spring 33 formed of a coil spring, and further at the tip thereof. The side is inserted into a hole 23 a provided at the axial center of the fixed iron core 23. A return spring 29 made of a coil spring is disposed in a hole 23 a provided in the fixed iron core 23, and the shaft portion 31 is inserted into the center hole of the return spring 29, and its tip is fixed to the movable iron core 24. Yes. Here, the contact pressure spring 33 inserted into the shaft portion 31 is disposed between the movable contact 4 and the first yoke 26. The spring force of the contact pressure spring 33 is set to be smaller than the spring force of the return spring 29.

  This electromagnetic switchgear is a so-called normally open type in which the contact is open when the coil 22 is not energized, and its operation will be described below.

  When the coil 22 is not energized, no electromagnetic attractive force acts on the movable iron core 24, and the movable iron core 24 receives a downward spring force from the return spring 29. The movable contact 4 receives an upward force from the contact pressure spring 33. The movable contact 4 is restricted from moving upward by the first yoke 11 fixed to the drive shaft 30, and the spring force of the return spring 29 is greater than the spring force of the contact pressure spring 33. It moves to the lower position together with the iron core 24. Therefore, the movable contacts 3A and 3B provided on the movable contact 4 are separated from the corresponding fixed contacts 1A and 1B, respectively, and no current flows between the fixed terminals 2A and 2B. .

  On the other hand, when the coil 22 is energized, a magnetic field is generated in the magnetic circuit composed of the fixed iron core 23, the yoke 25, and the movable iron core 24, and the movable iron core 24 is attracted to the fixed iron core 23. Move to. When the drive shaft 30 moves upward as the movable iron core 24 moves upward, the first yoke 11 attached to the drive shaft 30 moves upward, and the upward movement restriction of the movable contact 4 is released. . Thereby, the movable contact 4 receives the spring force of the contact pressure spring 33 and moves upward (the fixed terminals 2A and 2B side), and the movable contacts 3A and 3B come into contact with the corresponding fixed contacts 1A and 1B, respectively. Then, a current flows between the fixed terminals 2A and 2B. For example, when a current flows from the fixed terminal 2A to the fixed terminal 2B via the movable contact 4, the magnetic field B1 is generated from the upper side to the lower side in the direction shown in FIG. A downward Lorentz force acts on the child 4 (a direction away from the fixed contacts 1A and 1B). On the other hand, when a current flows through the movable contact 4, a magnetic field is generated around the movable contact 4 (see FIG. 1C), and both the first yoke 11 and the second yoke 12 are magnetized by this magnetic field, A magnetic attractive force is generated between the first yoke 11 and the second yoke 12.

  Here, when the coil 22 is energized, the drive shaft 30 is held at the upper end position by the electromagnet device C2, so the first yoke 11 fixed to the upper end portion of the shaft portion 31 is also held at the upper end position. . A magnetic attraction force is generated between the first yoke 11 and the second yoke 12 that are opposed to each other with the movable contact 4 interposed therebetween, so that the movable contact 4 is pressed against the fixed contacts 1A and 1B by the magnetic attraction force. Will be. Here, the force applied to the movable contact 4 by the magnetic attractive force generated between the yokes 11 and 12 is the magnetic repulsive force applied to the movable contact 4 when a large current such as a short-circuit current flows between the contacts. The force is about 180 degrees opposite. Therefore, when the contact is closed or a large current such as a short-circuit current flows between the contacts, the electromagnetic repulsive force that presses the movable contact 4 in the direction away from the fixed contacts 1A and 1B is applied to both yokes 11 and 12. Since it is reduced by the magnetic attraction force generated between them, it is possible to suppress a decrease in contact pressure. Therefore, the contact pressure between the contacts can be sufficiently secured, and the gap between the contacts can be prevented from being generated by suppressing the floating of the contact. This makes it difficult for the contact to weld. Further, the convex portion 14 provided on the first yoke 11 is engaged with the concave portion 17 provided on the second yoke 12, so that the first yoke 11 and the second yoke 12 intersect with each other. The relative positional deviation is suppressed in the direction to be performed. By the way, if the relative position of the first yoke 11 and the second yoke 12 is shifted in the direction intersecting the direction in which the first yoke 11 and the second yoke 12 face each other, a leakage magnetic flux is generated, and the first The magnetic attractive force generated between the yoke 11 and the second yoke 12 is reduced. On the other hand, in the present embodiment, the first yoke 11 and the second yoke 12 are positioned in the direction crossing the opposing direction, so that the relative displacement between the yokes 11 and 12 is suppressed, and leakage occurs. Magnetic flux can be reduced. Therefore, it can suppress that the magnetic attraction force generate | occur | produced between the 1st yoke 11 and the 2nd yoke 12 with the electric current which flows through the movable contact 4 can be suppressed, and can suppress the fall of contact pressure.

  In the above-described embodiment, the shaft portion 31 of the drive shaft 30 is passed through the holes provided in the movable contact 4, the first yoke 11, and the second yoke 12, but as shown in FIG. The holder 34 provided at the tip of the drive shaft 30 may hold the movable contact 4, the first yoke 11, and the second yoke 12. The holder 34 is formed in the shape of a square cylinder having left and right side openings, and the shaft portion 31 extends downward from the center of the bottom of the holder 34. The first yoke 11 is fixed to the upper side of the holder 34 in the cylinder. In the cylinder of the holder 34, the movable contact 4 and the second yoke 12 are disposed below the first yoke 11 so as to be movable in the vertical direction, and the bottoms of the second yoke 12 and the holder 34 are arranged. A contact pressure spring 33 is arranged between the walls.

  In this electromagnetic switching device, when the coil 22 is not energized, the drive shaft 30 moves downward by the spring force of the return spring 29, and the holder 34 also moves downward accordingly. At this time, the movable contact 4 held by the holder 34 also moves downward, and the contact portion is in an open state.

  On the other hand, when the coil 22 is energized, the holder 34 is moved upward together with the drive shaft 30, and the movable contacts 3A and 3B provided on the movable contact 4 come into contact with the corresponding fixed contacts 1A and 1B. The contact pressure is given by the spring force of the spring 33. Further, when the contact portion is closed, an electric current flows through the movable contact 4 and a magnetic field is generated around it, so that an electromagnetic attractive force is generated between the first yoke 11 and the second yoke 12 fixed to the holder 34. The movable contact 4 receives an upward force (side of the fixed contacts 1A and 1B) from the second yoke 12. Therefore, even if an electromagnetic repulsion force in a direction away from the fixed contacts 1A and 1B is applied to the movable contact 4 due to a current flowing through the movable contact 4, it is generated between the first yoke 11 and the second yoke 12. A decrease in contact pressure can be suppressed by the electromagnetic attractive force. Further, since the first yoke 11 and the second yoke 12 are positioned in the left-right direction by the engagement of the convex portion 14 of the first yoke 11 and the concave portion 17 of the second yoke 12, the leakage magnetic flux is reduced and the first The magnetic attractive force generated between the first yoke 11 and the second yoke 12 can be increased.

  By the way, the contact device C1 of this embodiment includes fixed contacts 1A and 1B, a movable contact 4, a first yoke 11 and a second yoke 12, and a positional deviation suppression mechanism. The movable contact 4 has movable contacts 3A and 3B that are in contact with and away from the fixed contacts 1A and 1B, and a second direction in which the corresponding contacts cross each other in the first direction (in this embodiment, orthogonal to the first direction). Current). The first yoke 11 and the second yoke 12 face each other across the movable contact 4 in the first direction, and one yoke (the first yoke 11 in this embodiment) is held at a predetermined position when the pole is closed. Has been. The positional deviation suppression mechanism suppresses a relative positional deviation between the first yoke 11 and the second yoke 12 in a direction intersecting the direction in which the first yoke 11 and the second yoke 12 face each other.

  Thereby, when a current flows through the movable contact 4, a magnetic attractive force is generated between the first yoke 11 and the second yoke 12 by a magnetic field generated around the movable contact 4. Since one of the first yoke 11 and the second yoke 12 is held at a predetermined position when the pole is closed, the first yoke 11 and the second yoke 12 are opposed to each other with the movable contact 4 interposed therebetween. The movement of the movable contact 4 in the direction away from the fixed contacts 1A and 1B can be restricted by the magnetic attraction force generated in FIG. Therefore, it can suppress that the contact pressure of movable contact 3A, 3B and fixed contact 1A, 1B falls by the magnetic repulsive force which generate | occur | produces when large currents, such as a short circuit current, flow. As a result, the contact pressure between the contacts can be sufficiently secured, and the gap between the contacts is less likely to occur by suppressing the floating of the contact. Therefore, the possibility that an arc is generated due to the occurrence of the gap can be reduced. It is difficult for the contact to weld due to high heat. Further, since the relative displacement between the two yokes in the direction intersecting the direction in which the first yoke 11 and the second yoke 12 face each other is suppressed by the displacement control mechanism, the leakage magnetic flux is reduced and the magnetic attraction is reduced. The force can be increased, and the decrease in contact pressure can be further suppressed.

  The contact device C1 includes a first movable contact 3A and a second movable contact 3B provided on one surface of the movable contact 4 as movable contacts, and a first contact that contacts the first movable contact 3A as a fixed contact. It has a fixed contact 1A and a second fixed contact 1B that contacts the second movable contact 3B. In the contact device C1, a current flows from one of the first fixed contact 1A and the second fixed contact 1B to the other through the movable contact 4.

  Thereby, one fixed contact 1A which is a charging part and the other fixed contact 1B can be arranged apart from each other, and an insulation distance between the fixed contact 1A and the fixed contact 1B can be sufficiently secured.

  Further, in the contact device C 1, the positional deviation suppression mechanism is provided on the engaged portion provided on one of the first yoke 11 and the second yoke 12 and on the other of the first yoke 11 and the second yoke 12. And an engaging portion that engages with the engaged portion.

  Thereby, the relative position shift of both yokes is suppressed in the direction intersecting the direction in which the first yoke 11 and the second yoke 12 face each other by the engaged portion and the engaging portion engaging with each other. Can do.

  In the contact device C1, the engaging portion is provided on one of the first yoke 11 and the second yoke 12 (the first yoke 11 in the present embodiment), and the other yoke (the second yoke in the present embodiment). It is composed of a convex portion 14 projecting toward the yoke 12). Further, the engaged portion is formed by a concave portion 17 provided on the other yoke and engaged with the convex portion 14.

  As a result, when the convex portion 14 and the concave portion 17 are engaged, the relative relationship between the first yoke 11 and the second yoke 12 in the direction intersecting the direction in which the first yoke 11 and the second yoke 12 face each other. Misalignment can be suppressed. In this embodiment, the first yoke 11 is provided with an engaging portion (convex portion 14), and the second yoke 12 is provided with an engaged portion (concave portion 17). The engaged portion may be provided on the second yoke 12 and the engaging portion may be provided on the second yoke 12 side.

  That is, as shown in FIGS. 3 (a) and 3 (b), the recesses 18 are provided at portions of the first yoke 11 that protrude from the front and rear sides of the movable contact 4, and the front and rear sides of the movable contact 4 are provided at the second yoke 12. A convex portion 19 that engages with the concave portion 18 may be provided on the side piece 16 that is disposed on the side piece 16.

  Even in this case, as described above, the engaged portion (concave portion 18) of the first yoke 11 and the engaging portion (convex portion 19) of the second yoke 12 are engaged, so that the first yoke 11 and the first yoke 11 In the direction intersecting with the direction in which the two yokes 12 face each other, it is possible to suppress relative displacement between the two yokes.

  Moreover, it is also preferable that an inclined surface is provided on each of the end surface of the concave portion that is the engaged portion and the end surface of the convex portion that is the engaging portion.

  For example, in the form shown in FIGS. 4A and 4B, the end surface (left and right end surfaces) of the convex portion 14 provided on the first yoke 11 is inclined so that the width dimension in the left-right direction becomes smaller toward the tip side. Inclined surfaces 14a and 14a are provided. In addition, inclined surfaces 17 a and 17 a that are inclined so that the width dimension in the left-right direction increases toward the distal end side are also provided on the end surfaces (left and right end surfaces) of the recess 17 provided in the second yoke 12.

  As a result, the inclined surface 14a provided on the end surface of the convex portion 14 and the inclined surface 17a provided on the end surface of the concave portion 17 serve as a guide for each other, thereby reducing the relative displacement between the two yokes. it can.

  As shown in FIGS. 5A and 5B, the end surface (left and right end surfaces) of the convex portion 19 provided on the second yoke 12 is inclined so that the width dimension in the left-right direction becomes smaller toward the tip side. Inclined surfaces 19a and 19a are provided, and inclined surfaces 18a and 18a are provided at the end surfaces (left and right end surfaces) of the recess 18 provided in the first yoke 11 so that the width dimension in the left and right direction increases toward the tip side. It could be Also in this case, as described above, the inclined surfaces respectively provided on the end surfaces of the convex portion and the concave portion serve as guides, and the relative displacement between both yokes can be reduced.

  In the present embodiment, the movable contact 4 of the contact device C1 is driven by the electromagnet device C2. However, the means for driving the movable contact 4 is not limited to the electromagnet device C2, for example, by manual operation. An opening / closing mechanism for driving the movable contact 4 may be used.

(Embodiment 2)
A contact device and an electromagnetic switch according to Embodiment 2 will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the component which is common in Embodiment 1, and the description is abbreviate | omitted. In the following description, the vertical and horizontal directions in FIG. 7A are used as a reference, and the directions perpendicular to the vertical and horizontal directions are assumed to be the front and rear directions. Note that the direction shown in FIG. 7 does not define the vertical and horizontal directions in the actual use state, and the mounting direction in actual use is not limited to the direction shown in FIG.

  As shown in FIG. 7A, the contact device C1 includes fixed contacts 1A and 1B, fixed terminals 2A and 2B having fixed contacts 1A and 1B, and a movable contact 4 having movable contacts 3A and 3B. The first yoke 35, the second yoke 36, and a misregistration suppression mechanism are provided.

  The fixed terminals 2A and 2B are both formed in a rectangular plate shape from a conductive metal material. A fixed contact 1A formed of a conductive metal material is fixed to the upper surface of the fixed terminal 2A. Also, a fixed contact 1B formed of a conductive metal material is also fixed to the upper surface of the fixed terminal 2B. The fixed contacts 1A and 1B are preferably formed of a material having a lower electrical resistance than the material forming the fixed terminals 2A and 2B in order to reduce the contact resistance.

  The movable contact 4 is formed in a rectangular plate shape from a conductive metal material, and the movable contacts 3A and 3B are fixed to the lower surface thereof so as to face the fixed contacts 1A and 1B, respectively. The movable contacts 3A and 3B are preferably formed of a material having a lower electrical resistance than the material forming the movable contact 4 in order to reduce the contact resistance.

  A lower end portion of a contact pressure spring 33 made of a coil spring is in contact with the upper surface of the movable contact 4, and an upper end portion of the contact pressure spring 33 is in contact with an inner wall of a case that accommodates the contact device C1 ( (See FIG. 8). The movable contact 4 receives a downward force (direction toward the fixed contacts 1A and 1B) from the contact pressure spring 33, and a contact pressure is applied when the contact portion is closed.

  Below the movable contact 4, a metal drive shaft 30 that is driven by an electromagnet device C <b> 2 to be described later and presses the movable contact 4 upward is disposed. A cap 37 formed of an insulating resin material is attached to the upper end portion of the drive shaft 30. Further, at the upper end of the cap 37, a rod-shaped shaft 37a protruding upward through a hole provided in each of the movable contact 4, the first yoke 35, and the second yoke 36 is integrally provided. An upper end portion of the shaft 37a is integrally provided with a flange portion 37b protruding in the radial direction of the shaft 37a.

  The first yoke 35 is formed in a flat plate shape from a magnetic material and is held on the upper surface of the movable contact 4. Both front and rear side portions of the first yoke 35 are extended to the outside of the movable contact 4, and a protruding portion 35 a protruding downward is provided at this protruding portion.

  The second yoke 36 is formed in a U-shape when viewed from the left and right directions by a magnetic material, and is held by a cap 37 of the drive shaft 30. Both front and rear side portions of the second yoke 36 are extended to the outside of the movable contact 4, and a side wall 36a protruding upward is provided from the protruding portion, and a concave portion 36b with which the convex portion 35a engages is provided on the side wall 36a. Is provided.

  Next, the operation of the contact device C1 will be described. In the following description, the movable contact 4 is driven by moving the drive shaft 30 in the vertical direction by a drive unit (not shown). As the driving means, for example, an electromagnet device C2 described later is used.

  When the contact is open, the upper end portion of the cap 37 is in contact with the lower surface of the second yoke 36 as shown in FIG. Here, when the contact is open, the cap 37 of the drive shaft 30 is held at the initial position (upper limit position), so that the downward displacement of the movable contact 4 is restricted.

  Next, when the drive shaft 30 is driven downward, the cap 37 is also displaced downward in conjunction with the drive shaft 30. When the cap 37 moves downward, the downward movement restriction of the movable contact 4 is released. Therefore, the movable contact 4 receives the spring force of the contact pressure spring 33 and moves downward (in the direction toward the fixed contacts 1A and 1B). ). Then, as shown in FIG. 7B, the movable contacts 3A and 3B of the movable contact 4 come into contact with the corresponding fixed contacts 1A and 1B, the contacts are closed, and the movable contacts 3A and 1B are movable between the fixed contacts 1A and 1B. A current flows through the contact 4.

  Here, as the drive shaft 30 moves downward, the second yoke 36 fixed to the cap 37 also moves downward. Even when the second yoke 36 moves to the lower end position, the convexity of the first yoke 35 is increased. The lower portion of the portion 35 a is engaged with the recess 36 b of the second yoke 36.

  When the contact portion is closed and a current flows through the movable contact 4, a magnetic field is generated around the contact, and a magnetic attractive force is generated between the first yoke 35 and the second yoke 36 facing each other with the movable contact 4 interposed therebetween. appear. Here, since the first yoke 35 is fixed to the upper surface of the movable contact 4, the first yoke 35 is moved to the second yoke 36 side by the magnetic attractive force generated between the first yoke 35 and the second yoke 36. Therefore, the contact pressure of the contact portion can be increased.

  By the way, when the contact portion is closed or a large current such as a short-circuit current flows when the contact portion is closed, the movable contact 4 has a fixed contact 1A, 1B due to a magnetic field generated around the movable contact 4. Electromagnetic repulsive force in the direction away from In the present embodiment, since the magnetic attraction force is generated between the first yoke 35 and the second yoke 36 as described above, it is possible to reduce the above-described electromagnetic repulsive force and suppress a decrease in contact pressure. it can. Further, the protrusions 35a of the first yoke 35 and the recesses 36b of the second yoke 36 are engaged with each other, so that the relative relationship between the two yokes in the direction intersecting with the direction in which the first yoke 11 and the second yoke 12 face each other. Misalignment can be suppressed. Therefore, the leakage magnetic flux generated by the positional deviation between the first yoke 35 and the second yoke 36 can be reduced and the magnetic attractive force can be increased, so that a decrease in contact pressure can be further suppressed.

  Next, an embodiment of an electromagnetic switching device provided with the contact device C1 will be described with reference to FIG. In the following description, the vertical and horizontal directions in FIG. 8 are used as a reference, and the vertical direction and the direction orthogonal to the horizontal direction are assumed to be the front and rear directions. Note that the direction shown in FIG. 8 does not define the vertical and horizontal directions in the actual use state, and the mounting direction in actual use is not limited to the direction shown in FIG.

  In this embodiment, as shown in FIG. 8, the contact device C1 and an electromagnet device C2 that opens and closes the contact portion by driving the movable contact 4 of the contact device C1 are housed in a hollow box-shaped housing 50. Configured. The housing 50 is made of resin, and is formed by integrally combining an upper case 51, an intermediate case 52, and a lower case 53 as shown in FIG. Further, the outer surface of the housing 50 excluding the right surface is covered with a rubber cover 54 for blocking sound and vibration.

  The contact device C <b> 1 is disposed in a space between the upper case 51 and the lower case 53. Here, the upper end portion of the contact pressure spring 33 is fixed to the upper surface inside the upper case 51. The drive shaft 30 extends through the middle case 52 to the lower case 53, and an intermediate portion of the drive shaft 30 is coupled to a movable iron core 24 described later. Since the contact device C1 has already been described in the above embodiment, the description thereof is omitted here.

  As shown in FIG. 8, the electromagnet device C <b> 2 includes a coil 22 wound around a coil bobbin 21, a fixed iron core 23, a movable iron core 24, and a return spring 29.

  The coil bobbin 21 is made of a resin molded product, and integrally includes a hollow cylindrical winding drum portion 21a and flanges 21b and 21b provided at both upper and lower ends of the winding drum portion 21a. The coil bobbin 21 has a coil 22 wound around a winding body 21a between the flanges 21b and 21b.

  A fixed iron core 23 made of a magnetic material is disposed at the lower end in the winding drum portion 21a. A concave portion 23c that is recessed downward is provided on the upper portion of the fixed iron core 23, and the lower portion of the return spring 29 is accommodated in the concave portion 23c. The inner peripheral surface of the upper part of the recess 23c is formed in a taper shape that increases in diameter toward the upper side, and the lower end of the movable iron core 24 is fitted into this taper part.

  A movable iron core 24 made of a magnetic material is movably disposed on the upper side of the fixed iron core 23 inside the winding drum portion 21a. A lower end portion of the movable iron core 24 is formed in a truncated cone shape, and a concave portion 24a that is recessed upward is provided on the tip surface thereof, and an upper portion of the return spring 29 is accommodated in the concave portion 24a. A metal drive shaft 30 is fixed to the movable iron core 24 so as to penetrate therethrough.

  The return spring 29 is a coil spring and is held between the upper surface of the recess 24 a provided in the movable iron core 24 and the lower surface of the recess 23 c provided in the fixed iron core 23. The return spring 29 is compressed when the movable iron core 24 is displaced downward, and an upward force is applied to the movable iron core 24 by the spring force of the return spring 29.

  Here, the outer diameter of the movable iron core 24 is smaller than the outer diameter of the fixed iron core 23, and the gap formed between the winding body 21a and the movable iron core 24 is formed in a cylindrical shape by a magnetic material. A plate 38 is provided. A flange 38 a that protrudes in the radial direction and is disposed on the upper side of the flange 21 b of the coil bobbin 21 is integrally provided at the upper end portion of the plate 38. The fixed iron core 23, the movable iron core 24, the plate 38, and the yoke (not shown) form a magnetic circuit.

  Hereinafter, the operation of the electromagnetic switch will be described. First, when the coil 22 is energized, the movable iron core 24 is attracted to the fixed iron core 23, whereby the drive shaft 30 fixed to the movable iron core 24 is displaced downward. When the cap 37 is displaced downward as the drive shaft 30 moves downward, the cap 37 moves away from the movable contact 4 and the restriction on the downward movement of the movable contact 4 is released. 4 receives the spring force of the contact pressure spring 33 and is displaced downward. When the movable contact 4 moves downward, the movable contacts 3A and 3B provided on the movable contact 4 come into contact with the corresponding fixed contacts 1A and 1B, thereby closing the contact.

  On the other hand, when the energization of the coil 22 is interrupted, the movable iron core 24 is displaced upward due to the spring force of the return spring 29, and the drive shaft 30 is also displaced upward. When the drive shaft 30 is displaced upward, the cap 37 provided at the upper end of the drive shaft 30 pushes the movable contact 4 upward, and the movable contacts 3A and 3B provided on the movable contact 4 are fixed contacts 1A and 1B. In this state, the contact is opened.

  As described above, in the contact device C1 according to the present embodiment, the electromagnetic repulsive force generated when the contacts are conducted or when a large current such as a short circuit current flows between the contacts is used as the first yoke 35 and the second yoke. 36 can be offset by the electromagnetic attractive force generated between them. Therefore, by reducing the electromagnetic repulsive force acting between the contacts by the electromagnetic attractive force generated between both yokes, it is possible to suppress a decrease in the contact pressure acting between the contacts. As described above, since a decrease in contact pressure between the contacts is suppressed, the movable contacts 3A and 3B are less likely to be separated from the corresponding fixed contacts 1A and 1B, and an arc is hardly generated between the contacts. Thus, the possibility that the movable contacts 3A and 3B are welded to the fixed contacts 1A and 1B can be reduced.

  The electromagnetic switchgear according to each of the embodiments described above, for example, in an electric vehicle such as an electric vehicle (EV), a hybrid vehicle (HEV), or a plug-in hybrid vehicle (PHEV), between a circuit that drives the motor and a battery, Used for cutting off high-voltage direct current high current (10A to several hundreds A). The application of the electromagnetic switchgear is not limited to an electric vehicle, but is preferably used for DC high voltage and high current control applications.

  In the electromagnetic switching device described above, the engaging portion is provided on one of the first yoke 11 and the second yoke 12, and the engaged portion is provided on the other. Instead of providing the two yokes 11 and 12, a structure in which the second yoke 12 is fitted into the groove 4a provided on the lower surface of the movable contact 4 as shown in FIG. Thus, since the second yoke 12 is positioned with respect to the movable contact 4 in the direction intersecting the direction in which both the yokes 11 and 12 face each other, the position of the second yoke 12 is determined, thereby the second The relative positional deviation between the yoke 12 and the first yoke 11 can be reduced. In the above-described embodiment, the second yoke 12 is fitted into the groove 4a of the movable contact 4, but the first yoke 11 is inserted into the groove provided on the upper surface of the movable contact 4 when the contact portion is closed. The first yoke 11 may be positioned with respect to the movable contact 4 by allowing a part thereof to enter.

C1 contact device C2 electromagnet device 1A, 1B fixed contact 2A, 2B fixed terminal 3A, 3B movable contact 4 movable contact 11 first yoke 12 second yoke 14 convex portion (positional displacement suppression mechanism, engagement portion)
17 Concave portion (positional deviation suppression mechanism, engaged portion)

Claims (6)

  A movable contact that has a fixed contact and a movable contact that contacts and separates from the fixed contact, and that allows current to flow in a second direction that intersects the first direction in which both the contacts are opposed; and the movable contact in the first direction A first yoke and a second yoke which are opposed to each other and one is held at a predetermined position when the pole is closed, and the first yoke and the second yoke in a direction intersecting the direction in which the both yokes face each other A contact point device comprising a position shift suppression mechanism for suppressing the relative position shift.   The movable contact has a first movable contact and a second movable contact provided on one surface of the movable contact, and the fixed contact is a first fixed contact that contacts the first movable contact; 2. A second fixed contact that contacts the two movable contacts, and a current flows from one of the first fixed contact and the second fixed contact to the other through the movable contact. The contact device according to 1.   The misregistration suppression mechanism is provided on the engaged portion provided on one of the first yoke and the second yoke, and on the other of the first yoke and the second yoke. The contact device according to claim 1, further comprising an engaging portion that engages.   The engaging portion is provided on one of the first yoke and the second yoke, and includes a convex portion protruding toward the other yoke, and the engaged portion is provided on the other yoke. The contact device according to claim 3, further comprising a concave portion with which the convex portion is engaged.   The contact device according to claim 4, wherein inclined surfaces are respectively provided on end surfaces of the concave portion and the convex portion. The contact device according to any one of claims 1 to 5,
An electromagnet device having a coil and driving the movable contact according to whether or not the coil is energized so that the movable contact is brought into contact with or separated from the fixed contact. Electromagnetic switchgear.

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