JP2005166431A - Electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic relay hardly radiating heat, of which contacts have long life. <P>SOLUTION: A movable contact 47 for arc is arranged on a movable contact piece 43 at one side obtained by splitting a movable contact piece 42 into two in a width direction, and a movable contact 48 for conduction is arranged on a movable contact piece 44 at the other side. The movable contact 48 for conduction contacts a fixed contact for conduction after the movable contact 47 for arc contacts a fixed contact for arc. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electromagnetic relay, and more particularly to a small electromagnetic relay capable of passing a large current.

Conventionally, as an electromagnetic relay, for example, a card is reciprocated through a movable block that rotates based on excitation of an electromagnet block, and a movable contact piece that is held by the upper end of the card is rotated to open and close the contact. (See Patent Document 1).
Japanese Unexamined Patent Publication No. 2000-285783

  However, in the electromagnetic relay having the above-described contact structure, when a large current is applied, a normal contact is likely to be consumed by arc discharge generated when the contact is opened and closed, and contact welding is likely to occur, so that the contact life is short. Further, when a large current is applied, a normal movable contact piece has a small cross-sectional area and a large electric resistance, so that heat is easily generated and the electromagnetic relay is overheated.

  In view of the above problems, an object of the present invention is to provide an electromagnetic relay that has a long contact life and hardly generates heat.

Means for Solving the Problems and Effects of the Invention

  In order to achieve the above object, an electromagnetic relay according to the present invention reciprocates a card through a movable block that rotates based on excitation of an electromagnetic block, and rotates a movable contact piece that is held at the upper end by the card. An electromagnetic relay that opens and closes a contact to provide an arc movable contact on one movable split piece obtained by dividing the movable contact piece into two in the width direction and energize the remaining movable split piece A movable contact is provided, and after the arc movable contact contacts the arc fixed contact, the energized movable contact contacts the energized fixed contact.

  According to the present invention, since the material having excellent arc resistance can be used for the arc movable contact, the contact life can be extended. In addition, since a material having excellent electrical conductivity can be used for the energizing movable contact, and a twin contact structure is used, the contact resistance is small even with a relatively small contact pressure. For this reason, the heat_generation | fever by electricity supply can be suppressed and the overheating of an electromagnetic relay can be prevented.

As an embodiment of the present invention, a separate auxiliary contact piece may be superposed on one side of the movable divided piece provided with at least a movable contact for energization among the movable divided pieces, and both ends may be integrated.
According to this embodiment, since the cross-sectional area of the movable split piece increases and the electrical resistance can be reduced, heat generation can be suppressed. In addition, since the spring constant is smaller and the spring load is smaller than when the same cross-sectional area is obtained by a single movable contact piece, power consumption can be suppressed.
In particular, if a separate auxiliary contact piece is superimposed only on one side of the movable split piece provided with the energizing movable contact, the spring constant of the entire movable contact piece will not increase significantly. For this reason, it is easy to match with the magnetic force of the electromagnet block, the design is easy, and an increase in material cost can be suppressed.

As another embodiment, a configuration may be adopted in which bent portions are formed in the intermediate portions of the movable divided piece provided with the energizing movable contact and the auxiliary contact piece, respectively, and a substantially square gap is formed between the opposing surfaces.
According to the present embodiment, since there is a substantially square gap between the opposed surfaces of the overlapped movable divided piece and auxiliary contact piece, even if the movable divided piece and auxiliary contact piece rotate simultaneously, Smooth rotation is ensured without stretching.

As another embodiment, a shielding tongue piece that partitions the movable contact for arc and the movable contact for energization may be provided on the inner edge of one of the pair of movable divided pieces. Good.
According to this embodiment, the shielding tongue prevents the contact scattered powder generated by the arc discharge at the time of opening and closing the contact from adhering to the energizing movable contact, and prevents contact failure and heat generation.

As a new embodiment, the upper ends of the pair of movable split pieces may be respectively engaged with engagement holes provided on the card so as to cause a time difference in opening and closing of the contacts.
According to this embodiment, the position of the pair of movable split pieces is accurately regulated by the engagement holes of the card. For this reason, it becomes easy to process and assemble the movable split piece having a time difference in opening and closing of the contacts, and the assembly accuracy and operation characteristics are improved.

As a different embodiment, the upper end of the movable split piece may be narrow.
According to the present embodiment, there is an effect that an assembling work of the movable divided piece with respect to the card is facilitated and an electromagnetic relay in which adjustment of the spring force of the movable divided piece is easy can be obtained.

An embodiment according to the present invention will be described with reference to the accompanying drawings of FIGS.
As shown in FIGS. 1 to 18, the first embodiment is roughly composed of a base 10, an electromagnet block 20, a movable block 30, a contact mechanism 40, a card 80, a microswitch 90, and a case 95. This is a case where it is applied to a self-holding electromagnetic relay.

  As shown in FIG. 2, the base 10 has a pair of support walls 12 and 13 that support a movable block 30 (described later) extending from both side edges on one side of the insulating wall 11 erected at the center of the upper surface. On the other hand, partition walls 14 and 15 are arranged in parallel at a predetermined pitch on the one surface side where the insulating wall 11 remains. Furthermore, an attachment wall 16 for attaching a microswitch 90 described later is provided on the extended line of the support wall 13. A guide projection 17 is provided on the upper end of the partition wall 14.

  As shown in FIGS. 3 and 4, the electromagnet block 20 is obtained by winding a coil 22 around a body portion 21c (FIGS. 13 to 16) of a spool 21 having flange portions 21a and 21b at both ends. Both ends of the coil 22 are electrically connected to coil terminals 23a and 23b provided on the flange 21b. Further, two plate-like iron cores 24 and 25 are inserted into the through hole 21d of the body portion 21c, and the first yoke 26 having a substantially L-shaped cross section is caulked and fixed to the protruding upper end portion, while the protruding lower end portion The second yoke 27 having a substantially L-shaped cross section is fixed by caulking. For this reason, the magnetic pole part 26a located in the lower end part of the 1st yoke 26 and the magnetic pole part 27a located in the upper end part of the 2nd yoke 27 have faced at predetermined intervals (FIG. 3).

  As shown in FIG. 5, the movable block 30 is inserted into and engaged with a permanent magnet 35 and a pair of movable iron pieces 36, 37 from below in a holder 31 having a substantially H-shaped cross section. The permanent magnets 35 are held by iron pieces 36 and 37. A rotation shaft 32a (not shown) and a rotation shaft 32b protrude from the opposite side surfaces of the holder 31 on the same axis. Further, an operation tongue 33 for operating an operation lever 91 of a micro switch 90 described later protrudes from an edge of a side surface from which the rotation shaft 32b protrudes.

  Then, after the movable block 30 is temporarily assembled between the magnetic pole portions 26 a and 27 a of the electromagnet block 20, the electromagnet block 20 is assembled between the support walls 12 and 13 of the base 10. Is positioned at a predetermined position. Further, when the rotation shafts 32a and 32b of the movable block 30 are fitted into the shaft holes 12a and 13a of the support walls 12 and 13 of the base 10, the movable block 30 is rotatably supported.

  As shown in FIG. 2, the contact mechanism 40 includes first and second movable contact terminals 41 and 51 and first and second fixed contact terminals 61 and 71. As shown in FIGS. 6 to 8, the first movable contact terminal 41 includes a front U-shaped movable contact piece 42, a front L-shaped auxiliary movable contact piece 45, a terminal portion 46, and an arc movable contact. 47 and a movable contact 48 for energization. Further, bent portions 43a, 44a and 45a are formed at the intermediate portion of the movable split pieces 43 and 44 forming the movable contact piece 42 and at the intermediate portion of the vertical portion of the auxiliary contact piece 45, respectively. The upper end portions 43c and 44c of the movable split pieces 43 and 44 are narrow. This is because if the entire movable split pieces 43 and 44 are narrowed, the electrical resistance increases and heat is easily generated. Further, a shielding tongue piece 45 c for shielding the energizing movable contact 48 from the arc discharge of the arc movable contact 47 is cut and raised at one side edge portion of the auxiliary contact piece 45.

  Then, the lower end portions of the movable contact piece 42 and the auxiliary contact piece 45 are caulked and integrated with the upper end portion of the terminal portion 46. Furthermore, the arc movable contact 47 is fixed by caulking to the caulking hole 43b of the movable split piece 43, and the energizing movable contact 48 is fixed by caulking to the caulking hole 44b of the movable split piece 44 and the caulking hole 45b of the auxiliary movable contact piece. By doing so, the movable contact piece 42 and the auxiliary movable contact piece 45 are integrated. For this reason, a substantially rectangular gap 49 is formed between the bent portion 44a and the bent portion 45a (FIG. 8). Further, the creeping distance from the movable contact 48 of the auxiliary movable contact piece 45 to the lower crimping position is longer than the creepage distance from the movable contact 48 of the movable split piece 44 to the lower crimping position. This is because when the contact is closed, the movable contact piece 42 and the auxiliary movable contact piece 45 are smoothly rotated without stretching.

  As shown in FIG. 9, the second movable contact terminal 51 includes a front substantially U-shaped movable contact piece 52, a front substantially L-shaped auxiliary movable contact piece 55, a bent terminal portion 56, and an arc movable contact. 57 and a movable contact 58 for energization. Further, bent portions 53a, 54a and 55a are formed at the intermediate portion of the movable split pieces 53 and 54 forming the movable contact piece 52 and the intermediate portion of the vertical portion of the auxiliary contact piece 55, respectively. The upper end portions 53c and 54c of the movable split pieces 53 and 54 are narrow. This is because if the entire movable split pieces 53 and 54 are made narrow, the electrical resistance increases and heat is easily generated. Further, a shielding tongue piece 55 c for shielding the energizing movable contact 58 from arc discharge of the arc movable contact 57 extends on one side edge of the auxiliary contact piece 55. The rest is substantially the same as the first movable contact terminal 41 described above.

  As shown in FIG. 10, the first fixed contact terminal 61 includes a substantially U-shaped fixed contact piece 62, a terminal portion 66, an arc fixed contact 67, and a current-carrying fixed contact 68. Furthermore, the upper ends of the fixed split pieces 63 and 64 forming the fixed contact piece 62 are bent into a substantially L shape. The lower end portion of the fixed contact piece 62 is caulked and fixed to the upper end portion of the terminal portion 66, and the arc fixed contact 67 and the energizing fixed contact 68 are respectively connected to the upper end portions of the fixed split pieces 63 and 64. Caulking is fixed.

  As shown in FIG. 11, the second fixed contact terminal 71 is composed of a substantially U-shaped fixed contact piece 72, a bent terminal portion 76, an arc fixed contact 77, and a current-carrying fixed contact 78. is there. Further, the upper ends of the fixed divided pieces 73 and 74 forming the fixed contact piece 72 are bent into a substantially L shape. The lower end portion of the fixed contact piece 72 is caulked and fixed to the upper end portion of the terminal portion 76, and the arc fixed contact 77 and the energizing fixed contact 78 are respectively connected to the upper end portions of the fixed split pieces 73 and 74. Caulking is fixed.

  2, the first movable contact terminal 41 and the first fixed contact terminal 61 are respectively press-fitted between the partition walls 14 and 15 of the base 10 from the side, as shown in FIG. The arc movable contact 47 and the fixed contact 67 are opposed to each other so as to be able to contact and separate, and the energizing movable contact 48 and the fixed contact 68 are opposed to each other so as to be able to contact and separate.

  In addition, by pressing the second fixed contact terminal 51 and the second movable contact terminal 71 from the side between the insulating wall 11 and the partition wall 14 of the base 10 as shown in FIG. The contact 57 and the fixed contact 78 face each other so as to be able to contact and separate, and the energizing movable contact 58 and the fixed contact 77 face each other so as to be able to contact and separate.

  The card 80 is a plate-shaped resin molded product that drives the contact mechanism 40 based on the rotating operation of the movable block 30. Then, the guide hole 81 provided in the central portion of the card 80 is fitted into the guide protrusion 17 of the base 10, and the first and second engagement holes 82 and 83 provided in the card 80 are the first ones. The first movable contact terminals 41 and 51 are engaged with the upper end portions 42c and 53c of the second movable contact terminals 41 and 51, respectively. Further, the third and fourth engagement holes 84 and 85 provided in the card 80 are engaged with the upper end portions 43c and 54c of the first and second movable contact terminals 41 and 51, respectively. However, the adjacent first and third engagement holes 82 and 84 and the adjacent second and fourth engagement holes 83 and 85 are provided at positions shifted by a predetermined distance. This is because the energizing movable contacts 48 and 58 are brought into contact with the energizing fixed contacts 68 and 78 after the arc movable contacts 47 and 57 come into contact with the arc fixed contacts 67 and 77, respectively. Further, a long hole 86 formed at one end of the card 80 is engaged with the engaging protrusion 34 of the movable block 30 and connected to the movable block 30.

  The micro switch 90 is for detecting the operation state of the movable block 30. Then, by attaching the micro switch 90 to the positioning projection 16a provided on the mounting wall 16 of the base 10 by heat caulking, the operation lever 91 of the movable block 30 can be operated with the operation lever 91.

  The case 95 has a box shape that can be fitted to the base 10 to which the above-described internal components are assembled, and a gas vent hole 96 is formed at the center of the upper surface thereof. Then, a case 95 is fitted and sealed to the base 10 incorporating the internal components, and after the internal gas is extracted from the degassing hole 96, the degassing hole 96 is sealed, whereby an electromagnetic relay is provided. Complete.

Next, the operation of the electromagnetic relay composed of the aforementioned internal components will be described.
First, as shown in FIGS. 13 and 14, based on the magnetic force of the permanent magnet 35, the upper end portion of the movable iron piece 36 is attracted to the magnetic pole portion 26 a of the yoke 26, and the lower end portion of the movable iron piece 37 is attached to the yoke 27. It is attracted to the magnetic pole part 27a. For this reason, the card 80 is urged in the opposite direction to the electromagnet block 20, the movable contacts 47, 48 of the first movable contact terminal 41 are in contact with the fixed contacts 67, 68 of the first fixed contact terminal 61, and the first The movable contacts 57 and 58 of the second movable contact terminal 51 are in contact with the fixed contacts 67 and 68 of the second fixed contact terminal 61 (FIG. 13). Further, the operating tongue 33 of the movable block 30 is in contact with the operating lever 91 of the micro switch 90 but is not pushed in (FIG. 15).

  When a voltage is applied to the coil 22 so as to generate a magnetic flux that cancels the magnetic flux of the permanent magnet 35, the upper end portion of the movable iron piece 36 is repelled and separated from the magnetic pole portion 26 a of the yoke 26, and the lower end of the movable iron piece 37. The portion repels the magnetic pole portion 27 a of the yoke 27. The lower end portion of the movable iron piece 36 is attracted and attracted to the magnetic pole portion 27a of the yoke 27, and the upper end portion of the movable iron piece 37 is attracted and attracted to the magnetic pole portion 26a of the yoke 26. For this reason, the movable block 30 rotates to slide the card 80, and the operation tongue piece 33 pushes the operation lever of the micro switch 90 to turn it on (FIG. 16). As a result, after the energizing movable contacts 48 and 58 are separated from the energizing fixed contacts 68 and 78, respectively, the arc movable contacts 47 and 57 are separated from the arc fixed contacts 67 and 77, respectively (FIG. 17). Even if an arc is generated while the arc movable contacts 47 and 57 are completely separated from the arc fixed contacts 67 and 77, the scattered powder to the energized movable contacts 48 and 58 and the energized fixed contacts 68 and 78 is generated. And the like are suppressed by the shielding tongues 45c and 55c.

  When the movable split piece 44 and the auxiliary contact piece 45 of the first movable contact terminal 41 are rotated, a substantially square gap 49 is formed between the bent portions 44a and 45a. For this reason, when the movable divided piece 44 and the auxiliary contact piece 45 are rotated, the movable divided piece 44 and the auxiliary contact piece 45 are not stretched, so that both perform a smooth rotation operation.

  Next, when a voltage in the direction opposite to the applied voltage is applied to the coil 22, the upper end of the movable iron piece 36 is attracted and attracted to the magnetic pole part 26 a of the yoke 26, and the upper end of the movable iron piece 37 is attached to the yoke 26. Repels the magnetic pole part 26a. The lower end portion of the movable iron piece 36 repels the magnetic pole portion 27 a of the yoke 27, and the lower end portion of the movable iron piece 37 is attracted and attracted to the magnetic pole portion 27 a of the yoke 27. During this time, after the arc movable contacts 47 and 57 abut on the arc fixed contacts 67 and 77, respectively, the energization movable contacts 48 and 58 abut on the energization fixed contacts 68 and 78, respectively. For this reason, the movable block 30 is rotated to slide the card 80, and the operation tongue piece 33 releases the pressing of the micro switch 90 against the operation lever 91 to be in the OFF state. As a result, after the arc movable contacts 47 and 57 are in contact with the arc fixed contacts 67 and 77, the energization movable contacts 48 and 58 are in contact with the energization fixed contacts 68 and 78, respectively. Even if arc discharge occurs while the arc movable contacts 47 and 57 are in contact with the arc fixed contacts 67 and 77, the scattered powder and the like for the energizing movable contacts 48 and 58 and the energizing fixed contacts 68 and 78, etc. Is prevented by the shielding tongues 45c and 55c. Thereafter, the circuit is opened and closed by repeating the same operation.

  In the present embodiment, when the movable split piece 44 and the auxiliary contact piece 45 of the first movable contact terminal 41 rotate, a substantially square gap 49 is formed between the bent portions 44a and 45a. Further, the creepage distance of the auxiliary contact piece 45 is longer than the creepage distance of the movable split piece 44. For this reason, when the movable divided piece 44 and the auxiliary contact piece 45 are rotated, there is an advantage that the movable divided piece 44 and the auxiliary contact piece 45 are smoothly rotated without stretching.

  In the second embodiment, as shown in FIGS. 19 and 20, the microswitch 95 that is the operation detecting means of the movable block 30 is changed to a reed switch 97. The reed switch 97 is incorporated in a storage recess 13 b provided in the support wall 13. Others are almost the same as those of the first embodiment, and the same parts are denoted by the same reference numerals and the description thereof is omitted.

  Of course, the present invention is not limited to the electromagnetic relay but may be applied to other switching devices.

It is a perspective view which shows 1st Embodiment of the electromagnetic relay concerning this invention. It is a disassembled perspective view of embodiment shown in FIG. FIG. 3 is a partially enlarged view of FIG. 2. FIG. 3 is an exploded perspective view of the electromagnet block shown in FIG. 2. It is a disassembled perspective view of the movable block shown in FIG. FIG. 3 is an exploded perspective view of a first movable contact terminal shown in FIG. 2. FIG. 3 is a perspective view of the first movable contact terminal shown in FIG. 2 viewed from a different angle. It is a side view of the 1st movable contact terminal shown in FIG. FIG. 3 is a perspective view of a second movable contact terminal shown in FIG. 2. FIG. 3 is an exploded perspective view of a first fixed contact terminal shown in FIG. 2. FIG. 3 is a perspective view of a second fixed contact terminal shown in FIG. 2. It is a top view which shows arrangement | positioning of the electromagnet block and contact mechanism of FIG. It is front sectional drawing before operation | movement of the electromagnetic relay shown in FIG. It is front sectional drawing after operation | movement of the electromagnetic relay shown in FIG. FIG. 14 is a rear cross-sectional view before the operation of the electromagnetic relay shown in FIG. 13. FIG. 14 is a rear cross-sectional view after the operation of the electromagnetic relay shown in FIG. 13. It is the elements on larger scale after the operation | movement of a 1st movable contact terminal and a 1st fixed contact terminal. It is the elements on larger scale before the operation | movement of a 1st movable contact terminal and a 1st fixed contact terminal. It is a perspective view which shows 2nd Embodiment of the electromagnetic relay concerning this invention. FIG. 20 is an exploded perspective view of the embodiment shown in FIG. 19.

Explanation of symbols

10: Base 11: Insulating wall 12, 13: Support wall 14, 15: Partition wall 16: Mounting wall 17: Protrusion for guide 20: Electromagnet block 21: Spool 22: Coil 24, 25: Plate iron core 26, 27: First and second yokes 26a, 27a: magnetic pole portion 30: movable block 31: holder 32a, 32b: rotating shaft 33: operating tongue 35: permanent magnet 36, 37: movable iron piece 40: contact mechanism 41, 51: First and second movable contact terminals 42, 52: movable contact pieces 43, 53: arc movable divided pieces 44, 54: energized movable divided pieces 45, 55: auxiliary movable contact pieces 46, 56: terminal portions 47, 57 : Movable contact for arc 48, 58: movable contact for energization 61, 71: first and second fixed contact terminals 62, 72: fixed contact piece 63, 73: fixed divided piece 64, 74: fixed divided piece 66, 7 6: Terminal portion 67, 77: Arc fixed contact 68, 78: Energizing fixed contact 80: Card 81: Guide hole 82, 83: First and second engagement holes 84, 85: Third and fourth engagements Joint hole 86: Long hole 90: Micro switch 91: Operation lever 92: Reed switch 95: Case 96: Gas vent hole

Claims (6)

An electromagnetic relay that reciprocates a card through a movable block that rotates based on excitation of an electromagnet block, rotates a movable contact piece that is held by an upper end of the card, and opens and closes a contact.
A movable contact for arc is provided on one movable divided piece obtained by dividing the movable contact piece into two in the width direction, and a movable contact for energization is provided on the other movable divided piece. An electromagnetic relay, wherein the energizing movable contact contacts the energizing fixed contact after contacting the fixed contact.   2. The electromagnetic relay according to claim 1, wherein a separate auxiliary contact piece is superposed on one side of the movable divided piece provided with at least a movable contact for energization among the movable divided pieces, and both ends are integrated.   The electromagnetic relay according to claim 2, wherein a bent portion is formed in an intermediate portion between the movable divided piece provided with the energizing movable contact and the auxiliary contact piece, and a substantially square gap is formed between the opposing surfaces.   4. A shielding tongue for partitioning the arc movable contact and the energization movable contact is provided at an inner edge of one of the pair of movable split pieces. An electromagnetic relay according to any one of the above.   The upper ends of the pair of movable division pieces are respectively engaged with engagement holes provided on the card so as to cause a time difference in opening and closing of the contacts, respectively. The electromagnetic relay described. The electromagnetic relay according to any one of claims 1 to 5, wherein an upper end portion of the movable divided piece is narrowed.

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