JP2007305604A - Contact spring group of electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic relay assembled simply and highly accurately, and suitable for downsizing and low power consumption. <P>SOLUTION: An armature 21 is arranged at a center part, a movable contact point spring 23 integrally formed with a hinge spring 22 in a longitudinal direction of the armature and both sides of the armature in parallel, and a plurality of pairs of transferring contact point springs and a plurality of pairs of making contact point springs structured by the movable contact point springs are formed, each contact point of the transferring contact point spring pair and each contact point of the making contact point spring pair are arranged on one side of the longitudinal direction of the armature, and also, the hinge spring 22 is arranged on the other side of the longitudinal direction of the armature 21, a free terminal side of the armature 21 of an opposite side of the hinge spring 22 structured to function as a movable contact point spring 23. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electromagnetic relay and a contact spring set of the electromagnetic relay, and more particularly to an electromagnetic relay used in a telephone exchange or the like and a contact spring set of the electromagnetic relay.

  In recent years, there is a demand for downsizing and low power consumption in various devices. By the way, for example, a plurality of electromagnetic relays (relays) are used in the subscriber circuit of the telephone exchange because lightning surge resistance is required. Even in such an exchange, there is a demand for downsizing, low power consumption, and low price by reducing the number of electromagnetic relays.

  Conventionally, a subscriber circuit of a telephone exchange has been required to have lightning surge resistance. When this lightning surge resistance is realized with a semiconductor element, it becomes extremely expensive. Therefore, an electromagnetic relay is used in the subscriber circuit of the exchange, and this trend is expected to continue in the future. .

FIG. 1 is a circuit diagram showing a general configuration of a subscriber circuit of a telephone exchange.
In FIG. 1, reference symbol J is a subscriber, B1 is a power supply unit, O is a large voltage protection unit for protecting the subscriber circuit from a large voltage such as lightning, and R is a ringing circuit (dial pulse transmission circuit). A circuit for notifying subscriber J of a bell sound, C is a codec that converts between a voice signal and a PCM signal, H is a hybrid that performs 2-wire to 4-wire conversion, and TST is a test circuit Yes. In FIG. 1, the large voltage protection unit O is provided with a primary side and a secondary side.

  The power supply unit B1 is connected to the call lines L1 and L2, and supplies a constant current to the call lines L1 and L2 when the subscriber J is off-hook. In this case, the power feeding unit B1 has a high impedance so as not to attenuate the signal with respect to the AC signal (audio signal).

  Each subscriber circuit of the exchange is provided with three electromagnetic relays 101, 102, and 103, and the connection of the test circuit TST is controlled by the two electromagnetic relays 101 and 102. It is to be selected. The remaining one electromagnetic relay 103 is used for sending a dial pulse.

  FIG. 1 shows the normal use (when the test is turned off), and during the test (when the test is turned on), all the connections of the electromagnetic relays 101, 102 and 103 are reversed and a test is performed by the test circuit TST. Is called. Here, the test by the test circuit TST is performed, for example, once a day or once every several days, and is used for confirming the impedance and connection of the subscriber J from the exchange. It is.

  FIG. 2 is a diagram showing a configuration example of an electromagnetic relay provided with one conventional movable contact spring, and FIG. 3 is a configuration example of a conventional electromagnetic relay provided with a plurality (four) of movable contact springs. FIG.

  2 and 3, the conventional electromagnetic relay includes, for example, a movable spring 200, a fixed spring 201, a terminal group 202 led out to the outside, an armature 203, and an electromagnetic block (iron core 204, reel 205). , Electric wires 206, yokes 207) and the like are individually assembled with respect to the substrate (base) 208. Therefore, the assembly accuracy cannot be improved, and the number of assembly steps has been increased. 2 and 3, reference numeral 200a is a movable contact, 201a is a fixed contact, 209 is a coil terminal, 210 is a cover, 211 is a lead wire, 212 is a spring, and 213 is a movable spring mold.

  Further, as shown in FIG. 2, the conventional movable spring 200 of the electromagnetic relay is, for example, one circuit and is welded directly to the armature 203 or the like, but a plurality of movable springs ( In an electromagnetic relay equipped with 200 (two or more circuits), a movable spring mold 213 is used, and a return spring such as another spring 212 is used for return, and the assembly is complicated.

  Further, for example, each subscriber circuit (test circuit TST) of the exchange uses three electromagnetic relays having two transfer contact spring sets (two for test circuits) as shown in FIG. . Since these electromagnetic relays need to be provided for each subscriber circuit, this greatly hinders the miniaturization of the switch and the reduction of power consumption. Furthermore, the cost required for these electromagnetic relays is increased, which is an obstacle to reducing the price of the exchange.

  An object of the present invention is to provide an electromagnetic relay that is simple and highly accurate and is suitable for downsizing and low power consumption in view of the problems of the above-described conventional electromagnetic relay. Furthermore, the present invention provides a contact spring set of an electromagnetic relay suitable for, for example, a test circuit of an exchange, and reduces the number of electromagnetic relays, thereby reducing the size of the exchange, reducing power consumption, and reducing the price. It is also aimed at planning.

  According to the present invention, the armature is arranged at the center, and the movable contact spring is integrally formed with the hinge spring in the longitudinal direction of the armature and in parallel with both sides of the armature, and the movable contact spring. A plurality of transfer contact spring sets and a plurality of make contact spring sets are provided, and each contact of the transfer contact spring set and each contact of the make contact spring set are arranged on one side in the longitudinal direction of the armature And the hinge spring is disposed on the other side in the longitudinal direction of the armature, and the free terminal side of the armature opposite to the hinge spring functions as the movable contact spring. Contact spring sets are provided.

  Here, for example, when an electromagnetic relay is used for connection control of a test circuit of a subscriber circuit in a telephone exchange, two transfer contact spring sets and two make contact spring sets are provided symmetrically with respect to the armature. Conventionally, an electromagnetic relay having two two-transfer contact spring sets can be replaced with one electromagnetic relay.

  Further, the end of each hinge spring of the movable contact spring block is welded to the corresponding spring terminal of the fixed contact spring block, and the movable contact spring block is attached to the fixed contact spring block using the elasticity of each hinge spring. can do. Furthermore, the end of each hinge spring may be an open end, and the open end of this hinge spring may be welded to the corresponding spring terminal by laser welding or the like.

  Thereby, it is possible to provide an electromagnetic relay that is simple and highly accurate and is suitable for downsizing and low power consumption. In addition, we provide electromagnetic relays (contact relay sets for electromagnetic relays) suitable for test circuits for telephone exchanges, reduce the number of electromagnetic relays, reduce the size of the exchange, reduce power consumption, and reduce costs. Can be achieved.

  According to the present invention, the armature is arranged at the center, and the movable contact spring is integrally formed with the hinge spring in the longitudinal direction of the armature and in parallel with both sides of the armature, and the movable contact spring. By providing the plurality of sets of transfer contact spring sets and the plurality of make contact spring sets, it is possible to provide an electromagnetic relay that is simple and highly accurate and that is suitable for miniaturization and low power consumption. Furthermore, according to the present invention, for example, a contact spring set of an electromagnetic relay suitable for a test circuit of a telephone exchange is provided, and the number of electromagnetic relays is reduced to reduce the size of the exchange and reduce power consumption. In addition, the price can be reduced.

  Hereinafter, an embodiment of an electromagnetic relay according to the present invention and a contact spring set of the electromagnetic relay will be described with reference to the drawings.

  4 is a diagram showing a test switching circuit and its equivalent circuit in the subscriber circuit of FIG. 1. FIG. 4 (a) corresponds to the configuration of FIG. 1, and FIG. 4 (b) is described below. This corresponds to application of an embodiment of the electromagnetic relay of the present invention.

  As shown in FIG. 4 (a), each subscriber circuit of the conventional exchange is provided with electromagnetic relays 101, 102, 103 having three two-transfer contact spring sets, of which two transfer contact spring sets are provided. The connection of the test circuit TST is controlled by the electromagnetic relays 101 and 102, and the transmission of the dial pulse is controlled by the remaining one electromagnetic relay 103.

  The equivalent circuit shown in FIG. 4B is applied to the electromagnetic relay according to the present invention and the contact spring set of the electromagnetic relay. That is, in the embodiment described below, the two electromagnetic relays 101 and 102 described above are configured as one electromagnetic relay 100, and two sets of make contact spring sets are provided as the two-transfer electromagnetic relay 101, and the two-transfer electromagnetic relay 102 is provided. As described above, two sets of transfer contact springs are provided to constitute a contact spring set of an electromagnetic relay.

  Here, FIG. 4A and FIG. 4B show the normal use (when the test is turned off), and at the time of the test (when the test is turned on), the electromagnetic relays 101, 102, 103 and 100 are shown. , 103 are inverted and the test by the test circuit TST is performed. The make contact of the electromagnetic relay 100 is switched to the break side during normal use and to the make side during testing. Further, the test by the test circuit TST is performed, for example, once a day or once every several days, and is for confirming the impedance and connection of the subscriber J from the exchange. is there.

  Thus, the electromagnetic relay (contact spring set of the electromagnetic relay) of the present embodiment is constituted by, for example, two electromagnetic relays 101 and 102 used in a subscriber circuit of a telephone exchange as one electromagnetic relay 100. The eight contacts by the electromagnetic relays 101 and 102 having two two-transfer contact spring sets are replaced with six contacts by the electromagnetic relay 100 having one two-make and two-transfer contact spring sets. As a result, it is possible to reduce the size, power consumption, and cost of an electromagnetic relay and an exchange using the electromagnetic relay. Further, the number of contacts is reduced from eight to six, thereby reducing the amount of noble metal used for the contacts and further reducing the cost.

  FIG. 5 is an exploded perspective view showing an embodiment of the electromagnetic relay according to the present invention, and FIG. 6 is an exploded perspective view of the electromagnet block in the electromagnetic relay of the present invention (partially exploded perspective view). 7 is a perspective view seen from the terminal side showing a state in which the electromagnet block is fitted inside the fixed contact spring block in the electromagnetic relay of the present invention, and FIG. 8 is a fixed contact spring block in the electromagnetic relay of the present invention. It is the perspective view seen from the terminal side which shows the state after filling the gap | interval with an electromagnet block with an insulating material. 9 is a sectional view taken along the line AA in the exploded perspective view of FIG. 5, and FIG. 10 is a sectional view taken along the line BB in the exploded perspective view of FIG. Further, FIG. 11 is an enlarged perspective view showing the movable contact spring block and the fixed contact spring block in the electromagnetic relay of the present invention.

  First, as shown in FIG. 5, the electromagnetic relay of the present embodiment is constituted by an electromagnet block 10, a movable contact spring block 20, a fixed contact spring block (box-shaped fixed contact spring block) 30, and a case (not shown). Is done.

  As shown in FIG. 6, in the electromagnet block 10, an iron core 17 bent in an L shape and a coil terminal 13 are integrally formed by an insert mold with respect to a winding frame mold 11 having flanges 12 and 12 on both sides. An electric wire 15 is wound around the body part 14 of the frame mold 11, and the protruding end part 17 a of the iron core 17 bent into an L shape in a central hole 14 a provided in the body part 14 is connected to a coupling recess 16 b of the L-shaped magnetic pole piece 16. And the other side is a magnetic pole surface 16a. The wound electric wire 15 is connected to the coil terminal 33 of the fixed contact spring block 30 by the coil terminal 13.

  As shown in FIGS. 5 and 11, the movable contact spring block 20 in the electromagnetic relay of the present embodiment has an armature 21 disposed in the center, and hinge springs in the longitudinal direction and on both sides of the armature 21. A plurality of movable springs 24 that also serve as the movable contact springs 22 and the movable contact springs 23 are disposed, and these are integrally molded by a molding material 26. The wide portion of the armature 21 formed by molding the movable spring 24 is a hinge spring 22, and the hinge spring 22 is configured to include a hinge portion 22 b bent into a dogleg shape. Is formed by punching a plate-shaped magnetic material, the free end portion 21a of the armature 21 is opposed to the magnetic pole surface 16a of the L-shaped magnetic pole piece 16, and the opposite end of the armature 21 is the L-shaped iron core. A portion that contacts the iron core hinge portion 17a and is supported by the iron core hinge portion 17a is configured as a wide portion 21b.

  The fixed contact spring block (box-shaped fixed contact spring block) 30 has a rectangular outer shape and a box shape having a hollow inside. A movable contact spring terminal 31, a fixed contact spring terminal 32 and a coil terminal 33 which are led out to the outside are integrally molded in the wall interior 36 of the molding material 35.

  7 and 8, the electromagnet block 10 is fitted inside the fixed contact spring block 30, and the mold filler 41 is poured into the gap between the fixed contact spring block 30 and the electromagnet block 10. By fixing, insulation between the coil and each contact spring is secured. Then, a case (not shown) is mounted on the fixed contact spring block 30 to complete the assembly of the electromagnetic relay. 9 is a cross-sectional view taken along the line AA in FIG. 5, and FIG. 10 is a cross-sectional view taken along the line BB in FIG. 5. As is apparent from FIGS. 10 and the fixed contact spring block 30 have an insulating structure.

  As shown in FIG. 11, the fixed contact spring 34 of the fixed contact spring terminal 32 led out to the outside is integrally connected to the fixed contact spring terminal 32 side, and is disposed to face the movable contact spring 23. Appropriate bending is performed so as to form a transfer group (make group and break group) according to the contact spring group of the fixed contact 34a. In this embodiment, as is apparent from FIG. 11, a 2-transfer set and a 2-make set corresponding to the equivalent circuit of FIG. 4B are configured. The transfer contact spring set and the make contact spring set are provided symmetrically with respect to the armature 21.

  The mechanical parts described above are integrated by molding to obtain the electromagnet block 10, the movable contact spring block 20, and the fixed contact spring block 30, and these blocks 10, 20, and 30 can be assembled by as shown in FIG. As shown in the exploded perspective view, the electromagnet block 10 is inserted and fixed to the insertion holes 38 and 39 provided in the hollow portion of the fixed contact spring block 30 from the terminal side (low side) led out to the outside. That is, the iron core hinge portion 17a of the iron core 17 is fitted through the insertion hole 38 provided in the hollow portion of the fixed contact spring block 30, and the magnetic pole surface 16a of the magnetic pole piece 16 passes through the insertion hole 39. In FIG. 5, it is fitted so as to protrude upward.

  Thereafter, the movable contact spring block 20 is mounted on the fixed contact spring block 30, and the free end portion 22 b of the hinge spring 22 bent in a U shape is fixed to the spring terminal 37 provided in the fixed contact spring block 30.

  FIG. 12 is a view showing a state in which the movable contact spring block is fitted into the fixed contact spring block in the electromagnetic relay of the present invention, and FIG. 13 is a diagram of the movable contact spring block and the fixed contact spring block in the electromagnetic relay of the present invention. It is a figure which shows a combined state. FIG. 14 is a view for explaining welding of the hinge spring and the spring terminal in the electromagnetic relay of FIG.

  As shown in FIGS. 12 and 13, the movable contact spring block 20 closely contacts the free end portion 22a of the hinge spring 22 on the spring terminal 37 integrally connected to the movable contact spring terminal 31 led out to the outside. Is attached to the fixed contact spring block 30 by welding with a laser or the like.

  Here, as shown in FIG. 14, the hinge spring 22 (hinge portion 22b) of the movable contact spring block 20 has an end portion (free end portion 22a) as an open end 22c, and an upper end of the open end 22c. By irradiating the laser beam LB to the part, the hinge spring 22 and the spring terminal 37 are fixed by the welded part MP, and the movable contact spring block 20 is fixed by using the elasticity of the hinge spring 22 (hinge part 22b). It is designed to be attached to the block 30. Here, in the movable contact spring block 20, the free terminal side of the armature 21 opposite to the hinge spring 22 functions as the movable spring 24 (movable contact spring 23). The free end 22a of the hinge spring 22 is used as the open end 22c because, when punched by a mold, scraps (punched portions) are easily removed and, for example, welding is performed by a spot-shaped laser beam LB. This is because the portion to be formed is increased as the entire curved welded portion MP. The free end portion 22a of the hinge spring 22 and the spring terminal 37 are not limited to welding using a laser, and various techniques can be used.

  In the above description, the case where the electromagnetic relay (contact spring set) is applied to the subscriber circuit of the telephone exchange is taken as an example. However, the electromagnetic relay (contact spring set) of the present invention is applied to various other devices. Needless to say, you can.

It is a circuit diagram which shows the general structure of the subscriber circuit of the telephone switchboard. It is a figure which shows one structural example of the electromagnetic relay which arrange | positioned one conventional movable contact spring. It is a figure which shows the example of 1 structure of the electromagnetic relay which arrange | positioned the conventional several (four) movable contact spring. FIG. 2 is a diagram showing a test switching circuit and its equivalent circuit in the subscriber circuit of FIG. 1. It is a disassembled perspective view which shows one Example of the electromagnetic relay which concerns on this invention. It is a disassembled perspective view of the electromagnet block in the electromagnetic relay of this invention. It is the perspective view seen from the terminal side which shows the state which fitted the electromagnet block inside the fixed contact spring block in the electromagnetic relay of this invention. It is the perspective view seen from the terminal side which shows the state after filling the clearance gap between the fixed contact spring block and the electromagnet block in the electromagnetic relay of this invention with the insulating material. It is sectional drawing cut | disconnected along the AA line in the exploded perspective view of FIG. It is sectional drawing cut | disconnected along the BB line in the disassembled perspective view of FIG. It is a perspective view which expands and shows the movable contact spring block and fixed contact spring block in the electromagnetic relay of this invention. It is a figure which shows a mode that the movable contact spring block in the electromagnetic relay of this invention is engage | inserted in a fixed contact spring block. It is a figure which shows the coupling | bonding state of the movable contact spring block and fixed contact spring block in the electromagnetic relay of this invention. It is a figure for demonstrating welding with the hinge spring and spring terminal in the electromagnetic relay of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electromagnet block 20 Movable contact spring block 21 Armature 21a Free end part 21b Wide part 22 Hinge spring 22a Free end part 22b Hinge part 22c Open end 23 Movable contact spring 23a Movable contact 24 Movable spring 25 Movable contact spring tip part 26 Molding Material 30 Fixed contact spring block 31 Movable contact spring terminal 32 Fixed contact spring terminal 33 Coil terminal 34 Fixed contact spring 34a Fixed contact 35 Mold material 36 Wall interior 37 Spring terminal 38, 39 Insertion hole 41 Mold filler LB Laser beam MP Welding part

Claims (3)

  A plurality of sets of transfer composed of a movable contact spring having an armature disposed in the center, integrally formed with a hinge spring in the longitudinal direction of the armature and parallel to both sides of the armature, and the movable contact spring A contact spring set and a plurality of make contact spring sets are provided, each contact of the transfer contact spring set and each contact of the make contact spring set are arranged on one side in the longitudinal direction of the armature, and the hinge A contact spring set for an electromagnetic relay, wherein a spring is arranged on the other side in the longitudinal direction of the armature, and a free terminal side of the armature opposite to the hinge spring functions as the movable contact spring.   2. The contact point set of the electromagnetic relay according to claim 1, wherein two pairs of the transfer contact spring set and the make contact spring set are provided symmetrically with respect to the armature. Spring set.   3. The contact spring set for an electromagnetic relay according to claim 1, wherein the contact spring set is used for connection control of a test circuit of a subscriber exchange.

Images