JP6079054B2 - Electromagnet device and electromagnetic relay using the same - Google Patents

Description

  The present invention relates to an electromagnet device, and more particularly to an electromagnet device used for a latching electromagnetic relay.

  Conventionally, as an electromagnet device used for a latching electromagnetic relay, for example, “a movable iron piece against a return spring by a residual magnetism of a magnetic circuit composed of an iron core around which a coil is wound, an iron core frame, and a movable iron piece. Magnetic holding type relay that attracts and holds a magnetic core, wherein the iron core is made of an electromagnetic soft iron material or a steel material having a carbon content of 0.01% or less, and the iron core frame is made of a semi-hard magnetic material. There is an electromagnet device that is used in Japanese Patent Application Laid-Open No. H10-260260 (see Patent Document 1).

Japanese Utility Model Publication No. 58-157947

However, in the electromagnet apparatus, the iron frame is made of a semi-hard magnetic material. However, for example, when applied to a latching type relay that requires a large switching load, the movable contact piece having a large spring force is driven. It is not easy. In particular, since a large holding force is required when holding a movable iron piece in an operating state, it is difficult to put it to practical use.
In general, the number of turns of the coil of the electromagnet device is limited due to the relationship with the external dimensions of the device, and the total number of turns of the set coil and the reset coil is limited if it is a two-turn electromagnet device. For this reason, for example, when the number of turns of the set coil is increased, the number of turns of the reset coil is reduced, and there is a problem that desired operation characteristics cannot be obtained.
In view of the above problems, the present invention provides an electromagnet device that has high magnetic efficiency, can easily move a movable iron piece, and can exhibit a holding force necessary for maintaining a return state and an operation state, and an electromagnetic device using the same. It is to provide a relay.

In order to solve the above-described problems, the electromagnet device according to the present invention has an iron core inserted through a center hole of a spool wound with two types of coils including a set coil and a reset coil, and fixed to one protruding end. The auxiliary yoke and the horizontal portion of the yoke sandwich a planar rectangular permanent magnet to form an auxiliary magnetic circuit, while the movable iron piece is rotatably supported using the lower end edge of the vertical portion of the yoke as a fulcrum. the horizontal portion of the movable iron piece separable therefrom is opposed to the magnetic pole portion which is the other end portion of the iron core, a magnet device provided parallel main magnetic circuit to the auxiliary magnetic circuit of the auxiliary yoke The front end surface and the front end surface of the horizontal portion of the yoke are disposed on the same vertical surface, and the outer end surface of the permanent magnet is disposed further back than the vertical surface, while the front end surface of the auxiliary yoke is With discontinuous end faces, The end opposite the tip end surface of serial auxiliary yoke, it is constituted that connected to the vertical portion of the yoke.

According to the present invention, the front end surface of the auxiliary yoke and the front end surface of the horizontal portion of the yoke are extended on the same vertical plane. For this reason, the opposing area of the auxiliary yoke and the horizontal portion of the yoke is increased, magnetic flux generated when a voltage is applied to the coil is less likely to leak, magnetic efficiency is improved, and an electromagnet device with low power consumption is obtained.
In particular, the total number of turns of the set coil and the reset coil is limited. For example, even if the number of turns of the reset coil is smaller than the number of turns of the set coil as in the conventional example, the latching type electromagnetic device having a desired specification is provided. Is obtained.

  The electromagnetic relay according to the present invention is configured to include the above-described electromagnet device in order to solve the above-described problems.

According to the present invention, the front end surface of the auxiliary yoke and the front end surface of the horizontal portion of the yoke are extended on the same vertical plane. For this reason, the opposing area of the auxiliary yoke and the horizontal portion of the yoke is increased, and magnetic flux generated when a voltage is applied to the coil is less likely to leak, thereby improving the magnetic efficiency. As a result, an electromagnetic relay with low power consumption can be obtained.
In particular, the total number of turns of the set coil and the reset coil is limited. For example, even if the number of turns of the reset coil is smaller than the number of turns of the set coil as in the conventional example, a latching electromagnetic relay having a desired specification is provided. Is obtained.
There is an effect.

1A and 1B are perspective views showing an electromagnetic relay incorporating an electromagnet device according to an embodiment of the present invention. It is the disassembled perspective view seen from diagonally upward of the electromagnetic relay shown in FIG. FIG. 2 is an exploded perspective view of the electromagnetic relay shown in FIG. 1 as viewed obliquely from below. 4A and 4B are perspective views showing the electromagnet device according to the first embodiment of the present invention. It is the disassembled perspective view seen from the upper side of the electromagnet apparatus shown in FIG. 4A. It is the disassembled perspective view seen from the downward direction of the electromagnet apparatus shown in FIG. 4B. 7A and 7B are sectional views showing before and after operation of the electromagnetic relay shown in FIG. 8A and 8B are schematic cross-sectional views for explaining the operation process of the electromagnet device according to the present invention. 9A and 9B are schematic cross-sectional views for explaining the operation process of the electromagnet device continued from FIG. It is a graph which shows the attractive force characteristic for demonstrating the change from the reset state of the electromagnetic relay which concerns on embodiment of this invention to an operation state. It is a graph which shows the attractive force characteristic for demonstrating the change from the operation state of the electromagnetic relay which concerns on embodiment of this invention to a return state. It is a graph for demonstrating the attraction | suction force characteristic of Example 1 and a comparative example. It is a schematic front view for demonstrating the electromagnet apparatus used for Example 2. FIG. 14A and 14B are a table and a graph showing the measurement results.

Embodiments of an electromagnet device according to the present invention will be described with reference to the accompanying drawings of FIGS.
As shown in FIGS. 1 to 9, the electromagnet device according to the present embodiment is applied to a latching electromagnetic relay. In general, the base 10, the electromagnet device 20, the contact mechanism 70, and the electromagnet device 20 are applied. And a card 80 that drives the contact mechanism 70 and a box-shaped cover 90.

  As shown in FIGS. 2 and 3, the base 10 has a substantially U-shaped insulating wall 11 projecting from the center of the upper surface, and an electromagnet device 20 to be described later is disposed on the upper surface of one side, while the other side is disposed. The contact mechanism 70 is arranged on the upper surface. The insulating wall 11 is provided with press-fitting grooves 12 for press-fitting both side edges of a yoke 50, which will be described later, on the opposing inner side surfaces, and a pair of guide ribs 13 in parallel at the center of the upper end thereof. Projected.

  As shown in FIGS. 4 to 5, the electromagnet device 20 has an approximately T-shaped iron core 40 inserted through a center hole 33 of a spool 32 in which a set coil 31 a and a reset coil 31 b are wound twice, and protrudes. An electromagnet block 30 in which an auxiliary yoke 45 is caulked and fixed to the upper end portion 41, a yoke 50 having a substantially L-shaped cross section assembled so as to sandwich the permanent magnet 21 between the upper end surface of the iron core 40, and the rear surface of the yoke 50 The support spring 55 is assembled to the side, and the movable iron piece 60 is rotatably supported via the support spring 55 with the lower end surface edge of the yoke 50 as a fulcrum.

  The spool 32 is soldered to the coil terminals 35 and 35 and the common coil terminal 38 that are press-fitted into the edge of the lower flange 34, with the lead wires of the set coil 31a and the reset coil 31b entangled. . The spool 32 is provided with a positioning projection 37 for positioning an auxiliary yoke 45 described later on the upper surface of the upper flange 36.

  The auxiliary yoke 45 has a caulking hole 46 in the center thereof, and parallel connection narrow portions 47 and 47 which are magnetoresistive portions having a small cross-sectional area with respect to the cross section of the base portion of the auxiliary yoke 45 from adjacent corners. It extends to.

  The permanent magnet 21 has a width dimension substantially the same as the width dimension of the auxiliary yoke 45.

  The yoke 50 having a substantially L-shaped cross section is provided with notches 52 and 52 for elastically engaging the support springs 55 described later on both sides of the vertical portion 51, respectively, and from the upper end of the vertical portion 51. The horizontal part 53 is extended to the side. The front end surface of the horizontal portion 53 is located on the substantially same vertical plane as the auxiliary yoke 45, and suppresses leakage magnetic flux to increase magnetic efficiency.

  As shown in FIGS. 5 and 6, the support spring 55 extends in parallel from a pair of elastic arm portions 56, 56 from both side edge portions thereof, and extends from the lower side edge portion thereof to elastic support portions 59. It is. Of the pair of elastic arm portions 56, 56, an engaging claw 57 projects from the tip of one elastic arm portion 56, while a locking claw 58 is cut and raised at the tip of the other elastic arm portion 56. is there.

  The movable iron piece 60 has a front half of the upper surface of the horizontal portion 61 as a step 62 that is one step lower, and a protrusion 63 for contact is formed on the step 62 by a protruding process. Further, the movable iron piece 60 is formed with engagement notches 65 and 65 for engaging a card 80 described later on both side edges of the tip of the vertical portion 64.

2 and 3, the contact mechanism 70 includes first and second fixed contact pieces 71 and 72 disposed so as to face each other at a predetermined distance, and the first and second fixed contact pieces 71, 72 and a movable contact piece 73 disposed between the two. The movable contact 73a provided on the movable contact piece 73 opposes the first fixed contact 71a and the second fixed contact 72a provided on the first and second fixed contact pieces 71 and 72, respectively, so that they can be alternately contacted and separated.
The upper end of the movable contact piece 73 is provided with two sets of locking claws 74 and 75 for vertically locking to the other end side edge 83 of the card 80 described later.

  As shown in FIGS. 2 and 3, the card 80 has a pair of elastic arm portions 82 and 82 extending on both sides of an abutment projection 81 projecting to one end side, and the other end side edge portion 83. A pair of locking arm portions 84 and 84 are extended from both ends.

  The box-shaped cover 90 has a box shape that can be fitted to the base 10 and bulges the position-regulating convex portion 91 downward from the ceiling surface thereof (see FIG. 7). A gas vent hole 92 is provided on the bottom surface of the portion 91. The position restricting convex portion 91 prevents the card 80 positioned on the lower side from being lifted. Further, the box-shaped cover 90 is provided with a mark concave portion 93 on one end side of the upper surface thereof.

  Therefore, when assembling the electromagnetic relay, first, the permanent magnet 21 is assembled so as to be held between the auxiliary yoke 45 of the electromagnet block 30 and the horizontal portion 53 of the yoke 50. The movable iron piece 60 is positioned at the lower end edge of the vertical portion 51 of the yoke 50, and the engaging claws 57 and the locking claws 58 of the support spring 55 are engaged with the notches 52 and 52 of the yoke 50, respectively. , The movable iron piece 60 is supported rotatably. Further, both side edges of the yoke 50 are press-fitted into the press-fitting grooves 12 and 12 provided in the insulating wall 11 of the base 10 and assembled.

  On the other hand, the second fixed contact piece 72, the movable contact piece 73 and the first fixed contact piece 71 of the contact mechanism 70 are press-fitted and assembled to the upper surface of the other side partitioned by the insulating wall 11 of the base 10. Next, the contact projection 81 of the card 80 is brought into contact with the vicinity of the upper end portion of the movable iron piece 60, and a pair of elastic notches 65, 65 provided on the vertical portion 64 of the movable iron piece 60 are paired with elastic arms. The parts 82 and 82 are engaged with each other. Further, the locking claws 74 and 75 of the movable contact piece 73 are locked to the other end side edge 83 of the card 80. Then, the box cover 90 is fitted to the base 10, and a sealing material (not shown) is injected into the bottom surface of the base 10 and sealed. Finally, after removing the internal gas from the vent hole 92 of the box-shaped cover 90, the assembly operation is completed by caulking the vent hole 92.

Next, the operation of the electromagnetic relay according to this embodiment will be described.
As shown in FIG. 7A, when no voltage is applied to the set coil 31a, the contact protrusion 63 of the movable iron piece 60 is separated from the magnetic pole part 42 of the iron core 40, and the movable contact 73a is the first contact. 1 is in contact with the fixed contact 71a. At this time, as shown in FIG. 8A, the magnetic flux of the permanent magnet 21 flows through the magnetic circuit M1 including the auxiliary yoke 45 while the leakage magnetic flux forms the magnetic circuit M2 via the yoke 50. To do. For this reason, the return state of the movable iron piece 60 is maintained by the balance between the spring force of the movable contact piece 73 and the magnetic force generated by the magnetic flux flowing in the magnetic circuits M1 and M2. The magnetic circuit M1 is in a magnetic saturation state.

  When a voltage is applied to the set coil 31a so that a magnetic flux in the same direction as the magnetic flux of the permanent magnet 21 is generated, the magnetic flux generated by the application of the voltage to the set coil 31a flows to the magnetic circuit M2 (FIG. 8B). The suction force with respect to 60 increases (FIG. 10). Therefore, against the spring force of the movable contact piece 73, the movable iron piece 60 is attracted to the magnetic pole part 42 of the iron core 40, and the abutting protrusion 63 is attracted to the magnetic pole part 42. For this reason, the vertical part 64 of the movable iron piece 60 presses the movable contact piece 73 via the card 80, and the movable contact 73a leaves the first fixed contact 71a and contacts the second fixed contact 72a (FIG. 7B).

  Next, even if the application of the voltage to the set coil 31a is stopped, the magnetic flux flowing from the permanent magnet 21 to the magnetic circuit M1 including the auxiliary yoke 45, the yoke 50, the movable iron piece 60, and the iron core 40 as shown in FIG. 9A. The resultant force of the magnetic force generated by the magnetic flux flowing in the magnetic circuit M2 is larger than the spring force of the movable contact piece 73 (FIG. 11). For this reason, the movable iron piece 60 maintains its operating state without rotating.

  Further, when a reset voltage in the opposite direction to the applied voltage is applied to the reset coil 31b so as to cancel the magnetic force of the permanent magnet 21 with respect to the movable iron piece 60 (FIG. 9B), the magnetic flux of the permanent magnet 21 is canceled and the magnetic force is reduced. The spring force of the movable contact piece 73 is relatively increased. For this reason, the movable contact 73a leaves the second fixed contact 72a, contacts the first fixed contact 71a, and returns to the original return state.

In this embodiment, even if a return voltage is applied to the reset coil 31b, the magnetic circuit M1 composed of the auxiliary yoke 45 is magnetically saturated, so that no magnetic flux flows through the magnetic circuit M1. For this reason, all the magnetic flux of the coil generated by the application of the return voltage flows to the magnetic circuit M2 including the yoke 50, the movable iron piece 60 and the iron core 40 to perform the return operation, so that a latching electromagnetic relay with low power consumption is obtained. There is an advantage that
Example 1

  As Example 1, the change in holding force when the front end surface of the auxiliary yoke is disposed outside the outer end surface of the permanent magnet and the front end surface of the horizontal portion of the yoke is disposed flush with the front end surface of the auxiliary yoke. Was calculated. On the other hand, when the tip end surface of the auxiliary yoke is arranged outside the outer end surface of the permanent magnet and the tip end surface of the horizontal portion of the yoke is arranged substantially flush with the outer end surface of the permanent magnet, the holding force changes as a comparative example. Was calculated. The calculation results are shown in FIG.

As shown in FIG. 12, it was found that when the return voltage was applied 100%, the improvement type of Example 1 was able to obtain a larger change in holding force than the comparative example. In particular, in Example 1, the movable iron piece is restored when 50% of the rated return voltage is applied, whereas in the comparative example, the movable iron piece is restored unless 70% of the rated return voltage is applied. Does not return. For this reason, it turned out that the direction of Example 1 is an electromagnet apparatus with higher magnetic efficiency than a comparative example.
(Example 2)

As shown in FIG. 13, how the holding force changes by the position of the outer end surface of the permanent magnet 21 and the position of the front end surface of the auxiliary yoke 45 and the front end surface of the horizontal portion 53 of the yoke 50 is obtained by calculation. It was.
The front end surface of the auxiliary yoke 45 protrudes from the outer end surface of the permanent magnet 21 by 1.8 mm. The change in holding force when the horizontal distance from the outer end surface of the permanent magnet 21 to the tip surface of the yoke 50 was changed was calculated. The amount of change in holding force was determined as the difference between the holding force when no applied voltage was applied and the holding force when a rated voltage (100%) was applied. An example of the calculation result is shown in FIG. 14A, and a graph of the calculation result is shown in FIG. 14B.

  As apparent from FIGS. 14A and 14B, when the front end surface of the auxiliary yoke 45 and the front end surface of the horizontal portion 53 of the yoke 50 are located on the same vertical plane, the holding force is the largest and the reset voltage is about 8 % Can be reduced.

  The electromagnet device according to the present invention is not limited to being applied to an electromagnetic relay, but of course may be applied to other electric devices.

10: Base 11: Insulating wall 12: Press-fit groove 13: Guide rib 20: Electromagnet device 21: Permanent magnet 30: Electromagnet block 31a: Set coil 31b: Reset coil 32: Spool 33: Center hole 34: Lower flange 35: Coil terminal 36: Upper collar portion 37: Positioning protrusion 38: Common coil terminal 40: Iron core 41: Upper end portion 42: Magnetic pole portion 45: Auxiliary yoke 46: Caulking hole 47: Narrow portion for connection (magnetic resistance portion)
50: Yoke 51: Vertical part 52: Notch part 53: Horizontal part 55: Supporting spring 56: Elastic arm part 57: Engaging claw 58: Locking claw 59: Elastic support part 60: Movable iron piece 61: Horizontal part 62: Step part 63: Projecting part for contact 64: Vertical part 65: Notch part for engagement 70: Contact mechanism 71: First fixed contact piece 71a: First fixed contact 72: Second fixed contact piece 72a: Second fixed contact 73: Movable contact piece 73a: Movable contact point 74, 75: Locking claw 80: Card 81: Abutment protrusion 82: Elastic arm portion 83: Other end side edge portion 84: Locking arm portion 90: Box-shaped cover 91 : Position regulating convex part 92: Gas vent hole 93: Marking concave part M1: Auxiliary magnetic circuit M2: Main magnetic circuit

Claims (2)

The iron core is inserted into the center hole of a spool wound with two types of coils consisting of a set coil and a reset coil, and an auxiliary yoke fixed to one end projecting and a planar rectangular permanent part While sandwiching the magnet to form an auxiliary magnetic circuit, the movable iron piece is supported rotatably about the lower end edge of the vertical portion of the yoke, and the horizontal portion of the movable iron piece is the other end of the iron core. in a magnetic pole portion separable therefrom is opposed to, an electromagnetic device which is provided in parallel to the main magnetic circuit to the auxiliary magnetic circuit,
While disposing the front end surface of the auxiliary yoke and the front end surface of the horizontal portion of the yoke on the same vertical surface, the outer end surface of the permanent magnet is disposed on the back side of the vertical surface ,
The front end surface of the auxiliary yoke is a discontinuous end surface, and the end located on the opposite side of the front end surface of the auxiliary yoke is connected to the vertical portion of the yoke.   An electromagnetic relay comprising the electromagnet device according to claim 1.

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