CN115943472A - Electromagnetic relay and electromagnetic relay unit - Google Patents

Electromagnetic relay and electromagnetic relay unit Download PDF

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Publication number
CN115943472A
CN115943472A CN202180050425.1A CN202180050425A CN115943472A CN 115943472 A CN115943472 A CN 115943472A CN 202180050425 A CN202180050425 A CN 202180050425A CN 115943472 A CN115943472 A CN 115943472A
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CN
China
Prior art keywords
permanent magnet
electromagnetic relay
contact
electromagnetic
yoke
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202180050425.1A
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Chinese (zh)
Inventor
山中凉
富田满
冈田全史
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Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Publication of CN115943472A publication Critical patent/CN115943472A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/14—Pivoting armatures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/10—Electromagnetic or electrostatic shielding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/36—Stationary parts of magnetic circuit, e.g. yoke
    • H01H50/38—Part of main magnetic circuit shaped to suppress arcing between the contacts of the relay
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)

Abstract

The purpose of the present disclosure is to suppress magnetic interference between a plurality of electromagnetic relays. The electromagnetic relay (1) includes a contact point portion (C0), an electromagnet device (5), a 1 st permanent magnet, a 2 nd permanent magnet, and a yoke (9). The 1 st permanent magnet is disposed on one side in the 1 st direction with respect to the contact portion (C0). The 2 nd permanent magnet is disposed on the other side in the 1 st direction with respect to the contact portion (C0). The yoke (9) has a 1 st side piece, a 2 nd side piece, and a connecting piece (93). The contact portion (C0) and the electromagnet device (5) are arranged along the 2 nd direction (D2). The 1 st permanent magnet is disposed between the 1 st side piece and the contact portion (C0). The 2 nd permanent magnet is disposed between the 2 nd side piece and the contact portion (C0). The connecting piece (93) and the contact portion (C0) are arranged along the 3 rd direction (D3).

Description

Electromagnetic relay and electromagnetic relay unit
Technical Field
The present disclosure relates generally to an electromagnetic relay and an electromagnetic relay unit, and more particularly to an electromagnetic relay including a permanent magnet and a yoke, and an electromagnetic relay unit including a plurality of the electromagnetic relays.
Background
The electromagnetic relay described in patent document 1 includes a contact opening and closing portion, an electromagnet block (electromagnet device), and an arc extinguishing member. The electromagnet block drives the contact opening/closing section to open and close the contacts. The arc extinguishing member includes a connecting member (yoke) formed of a magnetic material and a permanent magnet.
Here, in the case where a plurality of electromagnetic relays are arranged in a row as described in patent document 1, there is a possibility that a magnetic field generated by the permanent magnets of some of the electromagnetic relays may inhibit the operation of the electromagnet blocks of other electromagnetic relays.
Documents of the prior art
Patent document
Patent document 1: japanese unexamined patent publication No. 2012-190764
Disclosure of Invention
An object of the present disclosure is to provide an electromagnetic relay and an electromagnetic relay unit capable of suppressing magnetic interference between a plurality of electromagnetic relays.
An electromagnetic relay according to an aspect of the present disclosure includes a contact portion, an electromagnet device, a 1 st permanent magnet, a 2 nd permanent magnet, and a yoke. The contact portion has a fixed contact and a movable contact. The movable contact is opposite to the fixed contact. The electromagnet device generates a driving force that drives the movable contact. The 1 st permanent magnet is disposed on one side in the 1 st direction with respect to the contact portion. The 2 nd permanent magnet is disposed on the other side in the 1 st direction with respect to the contact portion. The yoke has a 1 st side plate, a 2 nd side plate and a connecting plate. The joining sheet joins the 1 st side sheet and the 2 nd side sheet. The contact portion and the electromagnet device are aligned along the 2 nd direction. The 2 nd direction is orthogonal to the 1 st direction. The 1 st permanent magnet is disposed between the 1 st side piece and the contact portion. The 2 nd permanent magnet is disposed between the 2 nd side piece and the contact portion. The connecting piece and the contact portion are arranged along the 3 rd direction. The 3 rd direction is orthogonal to both the 1 st direction and the 2 nd direction.
An electromagnetic relay unit according to an aspect of the present disclosure includes a plurality of electromagnetic relays. The plurality of electromagnetic relays include contact portions, electromagnet devices, 1 st permanent magnets, 2 nd permanent magnets, and yokes, respectively. The contact portion has a fixed contact and a movable contact. The movable contact is opposite to the fixed contact. The electromagnet device generates a driving force that drives the movable contact. The 1 st permanent magnet is disposed on one side in the 1 st direction with respect to the contact portion. The 2 nd permanent magnet is disposed on the other side in the 1 st direction with respect to the contact portion. The yoke has a 1 st side plate, a 2 nd side plate and a connecting plate. The joining sheet joins the 1 st side sheet and the 2 nd side sheet. In each of the plurality of electromagnetic relays, the contact portion and the electromagnet device are aligned along a 2 nd direction. The 2 nd direction is orthogonal to the 1 st direction. In each of the plurality of electromagnetic relays, the 1 st permanent magnet is disposed between the 1 st side piece and the contact portion. In each of the plurality of electromagnetic relays, the 2 nd permanent magnet is disposed between the 2 nd side piece and the contact portion. In each of the plurality of electromagnetic relays, the connecting piece and the contact portion are arranged along a 3 rd direction. The 3 rd direction is orthogonal to both the 1 st direction and the 2 nd direction. Two electromagnetic relays adjacent to each other among the plurality of electromagnetic relays are arranged such that at least a part of each of the yokes faces in the 1 st direction.
Drawings
Fig. 1 is a perspective view of an electromagnetic relay according to an embodiment.
Fig. 2 is a front sectional view of the electromagnetic relay, showing a state where the coil is not energized.
Fig. 3 is a front cross-sectional view of the electromagnetic relay, showing a state in which the coil is energized.
Fig. 4 is a side sectional view of the electromagnetic relay.
Fig. 5 is a cross-sectional view of the electromagnetic relay as viewed from above.
Fig. 6 is a plan view of an electromagnetic relay unit including two of the above-described electromagnetic relays.
Fig. 7 is an exploded perspective view of the cover and the yoke of the electromagnetic relay.
Fig. 8 is a bottom view of the cover of the electromagnetic relay.
Fig. 9 is a perspective view of a main portion of the electromagnetic relay.
Fig. 10 is a front sectional view showing the mounting operation of the hinge spring of the electromagnetic relay.
Fig. 11 is a front sectional view showing the mounting operation of the hinge spring of the electromagnetic relay.
Fig. 12 is a plan view of an electromagnetic relay unit according to a modification.
Detailed Description
Hereinafter, an electromagnetic relay and an electromagnetic relay unit according to an embodiment will be described with reference to the drawings. However, the following embodiments are only one of various embodiments of the present disclosure. The following embodiments can be variously modified according to design and the like as long as the purpose of the cost disclosure can be achieved. The drawings described in the following embodiments are schematic drawings, and the ratio of the size and thickness of each component in the drawings is not limited to a certain ratio reflecting actual dimensions.
(1) Summary of the invention
As shown in fig. 1 to 4, the electromagnetic relay 1 of the present embodiment includes a contact portion C0, an electromagnet device 5, a 1 st permanent magnet 21, a 2 nd permanent magnet 22, and a yoke 9. The contact portion C0 has a fixed contact F1 and a movable contact M1. Movable contact M1 is opposed to fixed contact F1. The electromagnet device 5 generates a driving force that drives the movable contact M1. The 1 st permanent magnet 21 is disposed on one side in the 1 st direction D1 with respect to the contact portion C0. The 2 nd permanent magnet 22 is disposed on the other side in the 1 st direction D1 with respect to the contact portion C0. The yoke 9 includes a 1 st side plate 91, a 2 nd side plate 92, and a coupling plate 93. The joining sheet 93 joins the 1 st side sheet 91 and the 2 nd side sheet 92. The contact portion C0 and the electromagnet device 5 are arranged along the 2 nd direction D2. The 2 nd direction D2 is orthogonal to the 1 st direction D1. The 1 st permanent magnet 21 is disposed between the 1 st side piece 91 and the contact portion C0. The 2 nd permanent magnet 22 is disposed between the 2 nd side piece 92 and the contact portion C0. The connecting piece 93 and the contact portion C0 are arranged along the 3 rd direction D3. The 3 rd direction D3 is orthogonal to both the 1 st direction D1 and the 2 nd direction D2.
According to the present embodiment, magnetic interference between the plurality of electromagnetic relays 1 can be suppressed. That is, in the electromagnetic relay 1 of the present embodiment, the coupling piece 93 is disposed at a position relatively close to the electromagnet device 5, as compared with a configuration (comparative example) in which the coupling piece 93 of the yoke 9 is disposed on an extension of a line segment from the electromagnet device 5 toward the contact portion C0 (on the right side of the contact portion C0 in fig. 2). Further, the yoke 9 suppresses leakage of the magnetic field generated from the 1 st permanent magnet 21 and the 2 nd permanent magnet 22 to the outside. Therefore, when the plurality of electromagnetic relays 1 are arranged in the same direction as shown in fig. 6, it is possible to reduce the possibility that the magnetic fields generated by the 1 st permanent magnet 21 and the 2 nd permanent magnet 22 of one electromagnetic relay 1 leak to the periphery of the electromagnet device 5 of the other electromagnetic relay 1 (the 2 nd electromagnetic relay). This can reduce the influence of the leakage magnetic field on the operation of the electromagnet device 5 of the 2 nd electromagnetic relay.
In the above comparative example, in order to suppress magnetic interference between the plurality of electromagnetic relays, it is sometimes necessary to dispose the plurality of electromagnetic relays separately from each other. In contrast, the structure of the present embodiment can shorten the interval between the plurality of electromagnetic relays 1.
Focusing on one electromagnetic relay 1, the possibility of leakage of the magnetic field generated by the permanent magnets (the 1 st permanent magnet 21 and the 2 nd permanent magnet 22) of the electromagnetic relay 1 to the periphery of the electromagnet device 5 of the electromagnetic relay 1 can be reduced. This can reduce the influence on the operation of the electromagnet device 5. That is, magnetic interference between the permanent magnet and the electromagnet device 5 can be suppressed.
The electromagnetic relay unit U1 (see fig. 6) includes a plurality of electromagnetic relays 1. Two electromagnetic relays 1 adjacent to each other among the plurality of electromagnetic relays 1 are arranged such that at least a part of each yoke 9 faces in the 1 st direction D1.
According to the electromagnetic relay unit U1, the effect of suppressing magnetic interference between the plurality of electromagnetic relays 1 is improved as compared with the case where the yokes 9 do not face each other.
(2) Definition of direction
Hereinafter, the 1 st direction D1 is also referred to as a front-rear direction, the 2 nd direction D2 is also referred to as a left-right direction, and the 3 rd direction D3 is also referred to as a top-bottom direction. Further, the 2 nd permanent magnet 22 side in the 1 st direction D1 as viewed from the 1 st permanent magnet 21 is defined as rear, and the 1 st permanent magnet 21 side in the 1 st direction D1 as viewed from the 2 nd permanent magnet 22 is defined as front. Further, the electromagnet device 5 side in the 2 nd direction D2 as viewed from the contact portion C0 is defined as the left, and the contact portion C0 side in the 2 nd direction D2 as viewed from the electromagnet device 5 is defined as the right. The connecting piece 93 side in the 3 rd direction D3 as viewed from the contact portion C0 is defined as upper, and the contact portion C0 side in the 3 rd direction D3 as viewed from the connecting piece 93 is defined as lower. However, the gist of these directions does not specify the direction of use of the electromagnetic relay 1. In addition, arrows indicating respective directions in the drawings are labeled only for explanation and are not accompanied with entities.
The fixed contact F1 and the movable contact M1 are arranged along the 2 nd direction D2. Movable contact M1 is disposed on the left side with respect to fixed contact F1.
(3) Use of
The electromagnetic relay 1 is a so-called hinge type relay. The electromagnetic relay 1 is used for a power supply circuit for a solar panel, a power supply circuit for a battery, or a power supply circuit for a server, for example. The electromagnetic relay 1 in these power supply circuits is used, for example, as an inrush current prevention circuit for limiting an inrush current.
(4) Description of the respective terminals
As shown in fig. 1 and 2, the electromagnetic relay 1 includes a 1 st terminal 36 and a 2 nd terminal 46. The 1 st terminal 36 is electrically connected to the movable contact M1. The 2 nd terminal 46 is electrically connected to the fixed contact F1. The 1 st terminal 36 and the 2 nd terminal 46 extend to one side (lower side) in the 3 rd direction D3 when viewed from the contact portion C0. The coupling piece 93 of the yoke 9 is disposed on the other side (upper side) in the 3 rd direction D3 when viewed from the contact portion C0.
The electromagnetic relay 1 further includes two coil terminals 511. Furthermore, the electromagnet arrangement 5 has a coil 51. One of the two coil terminals 511 is electrically connected to the 1 st end of the coil 51, and the other is electrically connected to the 2 nd end of the coil 51. The coil 51 is energized via two coil terminals 511.
The electromagnet device 5 moves the movable contact M1 between a closed position (a position shown in fig. 3) in contact with the fixed contact F1 and an open position (a position shown in fig. 2) separated from the fixed contact F1 in accordance with the presence or absence of energization of the coil 51. When the coil 51 is energized, the movable contact M1 is in the closed position, and when the coil 51 is not energized, the movable contact M1 is in the open position. When the movable contact M1 is in the closed position, the 1 st terminal 36 and the 2 nd terminal 46 are in conduction, and when the movable contact M1 is in the open position, the 1 st terminal 36 and the 2 nd terminal 46 are in non-conduction.
(5) Outer cover
As shown in fig. 2, the electromagnetic relay 1 further includes a housing 7. The housing 7 houses the contact portion C0, the 1 st permanent magnet 21, and the 2 nd permanent magnet 22. Further, the housing 7 houses the electromagnet device 5.
The housing 7 is formed of, for example, synthetic resin. The housing 7 is electrically insulating. The housing 7 has a cover 71 and a base 72.
(5.1) cover
As shown in fig. 7 and 8, the cover 71 includes a cover main body 711, two insertion portions 712, a wall portion 713, and a plurality of (two in fig. 7) protrusions 714.
The cover main body 711 has a box shape. More specifically, the cover main body 711 has a rectangular parallelepiped outer shape. The cover main body 711 has an opening 7110 in a lower surface. The cover main body 711 has a length in the 2 nd direction D2 (left-right direction) longer than a length in the 1 st direction D1 and a length in the 3 rd direction D3.
The two insertion portions 712 are provided inside the cover main body 711. The two insertion portions 712 correspond one-to-one to the two permanent magnets, i.e., the 1 st permanent magnet 21 and the 2 nd permanent magnet 22. A corresponding permanent magnet is inserted into each insertion portion 712.
Each insertion portion 712 has a box shape. More specifically, each insertion portion 712 has a rectangular parallelepiped outer shape.
Each insertion portion 712 has an opening 7120 on a lower surface. The 1 st permanent magnet 21 and the 2 nd permanent magnet 22 are inserted into the corresponding insertion portions 712 through the opening portions 7120.
The two insertion portions 712 are aligned along the 1 st direction D1. One of the two insertion portions 712 is arranged along a front surface of the inner surface of the cover main body 711. The other of the two insertion portions 712 is arranged along the rear surface of the inner surface of the cover main body 711. Further, two insertion portions 712 are arranged along the right surface among the inner surfaces of the cover main body 711.
The wall 713 is plate-like in shape. The thickness direction of the wall portion 713 is along the 2 nd direction D2. The wall portion 713 is disposed near the center inside the cover main body 711. The wall portion 713 partitions the right 1 st space SP1 and the left 2 nd space SP2 in the internal space of the cover main body 711. As shown in fig. 2, the contact portion C0 is disposed in the 1 st space SP1, and the electromagnet device 5 is disposed in the 2 nd space SP 2.
As shown in fig. 7, the cover main body 711 has a 1 st groove 715, a 2 nd groove 716, and a 3 rd groove 717 on its outer surface. The 1 st groove portion 715 is connected to the 2 nd groove portion 716 and the 3 rd groove portion 717, respectively.
The 1 st groove 715 is provided on the upper surface S3 of the cover main body 711. The 1 st groove 715 is provided across both ends of the cover main body 711 in the 1 st direction D1. The coupling piece 93 of the yoke 9 is inserted into the 1 st groove 715.
The 2 nd groove 716 is provided on the front surface S1 of the cover main body 711. The 2 nd slot portion 716 extends downward from the front end of the 1 st slot portion 715. The 1 st side piece 91 of the yoke 9 is inserted into the 2 nd groove 716.
The 3 rd groove portion 717 is provided on the rear surface S2 of the cover main body 711 (see fig. 4). The 3 rd groove portion 717 extends downward from the rear end of the 1 st groove portion 715. The 2 nd side piece 92 of the yoke 9 is inserted into the 3 rd groove portion 717.
One of the two protrusions 714 protrudes from the bottom surface of the 2 nd groove portion 716. The other of the two protrusions 714 protrudes from the bottom surface of the 3 rd groove portion 717.
(5.2) base
As shown in fig. 2, the base 72 is attached to the cover main body 711 so as to close the opening 7110 of the cover main body 711.
The base 72 includes a base body 721 and a plurality of wall portions 722. The base main body 721 has a rectangular plate shape. The thickness direction of the base main body 721 is along the 3 rd direction D3. A plurality of wall portions 722 protrude upward from the base main body 721. Another structure is disposed between the plurality of wall portions 722. Specifically, a card board (japanese: 124591254089) 6, a movable conductive part 3, and a fixed conductive part 4, which will be described later, are arranged between the plurality of wall parts 722.
The 1 st terminal 36, the 2 nd terminal 46, and the two coil terminals 511 of the electromagnetic relay 1 are exposed to the outside of the case 7 through holes formed in the base main body 721.
(6) Permanent magnet
As shown in fig. 4, the 1 st permanent magnet 21 and the 2 nd permanent magnet 22 are inserted into the corresponding insertion portions 712 of the cover 71, respectively. The 1 st permanent magnet 21 and the 2 nd permanent magnet 22 are, for example, neodymium magnets, respectively.
The 1 st permanent magnet 21 is disposed forward when viewed from the contact portion C0, and the 2 nd permanent magnet 22 is disposed rearward when viewed from the contact portion C0. The 1 st permanent magnet 21 and the 2 nd permanent magnet 22 overlap the fixed contact F1 and the movable contact M1 in the front-rear direction.
The direction of the magnetic moment of the 1 st permanent magnet 21 is along the 1 st direction D1. The direction of the magnetic moment of the 2 nd permanent magnet 22 is along the direction of the magnetic moment of the 1 st permanent magnet 21. The end of the 1 st permanent magnet 21 closer to the contact point C0 is the N pole, and the end on the opposite side is the S pole. The end of the 2 nd permanent magnet 22 closer to the contact point portion C0 is the S pole, and the end on the opposite side is the N pole. Therefore, the direction of the magnetic field around the contact portion C0 is rearward.
In fig. 4, characters "N" are given to the N-pole side and characters "S" are given to the S-pole side of the 1 st permanent magnet 21 and the 2 nd permanent magnet 22, respectively. However, "N" and "S" in fig. 4 are characters denoted for explanation and are not actually denoted characters.
(7) Magnetic yoke
The yoke 9 is formed of a magnetic material such as iron (e.g., electromagnetically soft iron). As shown in fig. 4, the yoke 9 has a U-shape when viewed from the 2 nd direction D2. The yoke 9 includes a 1 st side plate 91, a 2 nd side plate 92, and a coupling plate 93. The 1 st side sheet 91, the 2 nd side sheet 92, and the connecting sheet 93 are integrally formed of the same material.
The 1 st side sheet 91, the 2 nd side sheet 92, and the connecting sheet 93 are each plate-like in shape. The 1 st side sheet 91, the 2 nd side sheet 92, and the connecting sheet 93 each have a rectangular shape in plan view. "rectangle" is a concept that encompasses squares and rectangles. The thickness direction of the 1 st and 2 nd side sheets 91 and 92 is along the 1 st direction D1. The thickness direction of the coupling piece 93 is along the 3 rd direction D3.
The 1 st side sheet 91 and the 2 nd side sheet 92 are opposed to each other in the 1 st direction D1. The connecting piece 93 connects the upper end of the 1 st side piece 91 to the upper end of the 2 nd side piece 92.
As described above, the yoke 9 is inserted into the 1 st, 2 nd, and 3 rd groove portions 715, 716, 717 (see fig. 7) formed in the outer surface of the cover body 711. Thereby, the yoke 9 is held on the outer surface of the housing 7.
As shown in fig. 7, a through hole 911 is formed in the 1 st side sheet 91. The 2 nd side sheet 92 has a through hole 921. The connecting piece 93 has a through hole 931 formed therein. One of the two protrusions 714 of the cover 71 is inserted into the through hole 911. The other of the two protrusions 714 of the cover 71 is inserted into the through hole 921.
When the yoke 9 is attached to the cover 71, the yoke 9 is lowered from above the cover 71 to below, and the 1 st and 2 nd side pieces 91 and 92 come into contact with the two protrusions 714. Due to the contact pressure of the 1 st and 2 nd side plates 91, 92 with the two protrusions 714, the yoke 9 is elastically deformed in such a manner that the interval between the 1 st and 2 nd side plates 91, 92 is enlarged. Then, the projections 714 are inserted into the through holes 911 and 921, respectively, whereby the yoke 9 is mounted to the cover 71. That is, the two through holes 911 and 921 and the two protrusions 714 constitute a mounting structure for mounting the yoke 9 and the cover 71.
As shown in fig. 4, the 1 st side sheet 91 is disposed outside the 1 st permanent magnet 21. That is, the 1 st side piece 91 is disposed in front of the 1 st permanent magnet 21.
The 2 nd side piece 92 is disposed outside the 2 nd permanent magnet 22. That is, the 2 nd side piece 92 is disposed rearward of the 2 nd permanent magnet 22.
In the electromagnetic relay 1, a magnetic circuit is formed which is configured by a path from the 1 st permanent magnet 21 through the periphery of the contact point portion C0, the 2 nd permanent magnet 22, the 2 nd side piece 92, the coupling piece 93, and the 1 st side piece 91 to return to the 1 st permanent magnet 21. The magnetic flux generated by the 1 st permanent magnet 21 and the 2 nd permanent magnet 22 passes through the magnetic circuit.
The magnetic permeability of the case 7 (cover 71) is lower than that of the yoke 9. Further, as shown in fig. 4, a part of the cover main body 711 partitions between the 1 st permanent magnet 21 and the 1 st side sheet 91, and another part of the cover main body 711 partitions between the 2 nd permanent magnet 22 and the 2 nd side sheet 92. More specifically, the portion of the cover main body 711 including the bottom surface of the 2 nd groove 716 separates the 1 st permanent magnet 21 from the 1 st side sheet 91. Further, a portion of the cover main body 711 including the bottom surface of the 3 rd groove portion 717 partitions between the 2 nd permanent magnet 22 and the 2 nd side sheet 92.
That is, in the electromagnetic relay 1, a region having a lower magnetic permeability than the yoke 9 is provided at least one (in the present embodiment, both) between the 1 st permanent magnet 21 and the 1 st side plate 91 and between the 2 nd permanent magnet 22 and the 2 nd side plate 92. In fig. 4, a region R1 between the 1 st permanent magnet 21 and the 1 st side sheet 91 and a region R2 between the 2 nd permanent magnet 22 and the 2 nd side sheet 92 are illustrated by two-dot chain lines. The regions R1 and R2 are regions occupied by the cover main body 711, respectively.
At least one (in the present embodiment, both) of a face across the outer surface of the outer shell 7 and the outer surface of the 1 st side sheet 91 and a face across the outer surface of the outer shell 7 and the outer surface of the 2 nd side sheet 92 is planar. More specifically, as shown in fig. 4 and 5, the front surface S1 of the cover main body 711 of the housing 7 and the front surface 910 of the 1 st side sheet 91 are planar. Further, the surface straddling the rear surface S2 of the cover main body 711 and the rear surface 920 of the 2 nd side sheet 92 of the housing 7 is planar.
In the present disclosure, the fact that the surface extending across the outer surface of the outer shell 7 and the outer surface of the 1 st side sheet 91 is "planar" means that the following 1 st and 2 nd conditions are satisfied. The 1 st condition is that the normal direction of the outer surface of the outer shell 7 is along the normal direction of the outer surface of the 1 st side sheet 91. The 2 nd condition is that there is no step between the outer surface of the outer shell 7 and the outer surface of the 1 st side sheet 91, or the step has a height smaller than a predetermined height even in the case of the step. The direction of the height of the step is a direction along the normal direction of the 1 st side sheet 91. The predetermined height is smaller than the thickness of the 1 st side sheet 91. Further, a gap may be provided between the outer surface of the housing 7 and the outer surface of the 1 st side sheet 91 in the direction along the outer surface of the 1 st side sheet 91.
The surface extending across the outer surface of the outer cover 7 and the outer surface of the 2 nd side sheet 92 is "planar" in the sense of satisfying the condition that the 1 st side sheet 91 is replaced with the 2 nd side sheet 92 in the above-described 1 st and 2 nd conditions.
The surface spanning the outer surface of the housing 7 and the outer surface of the coupling piece 93 is planar. More specifically, as shown in fig. 2, the upper surface S3 of the cover main body 711 extending across the housing 7 and the upper surface 930 of the coupling piece 93 are planar. The surface extending over the outer surface of the outer shell 7 and the outer surface of the connecting piece 93 is "planar" in the sense of satisfying the condition that the 1 st side sheet 91 is replaced with the connecting piece 93 in the 1 st and 2 nd conditions described above.
(8) Movable conductive part
Fig. 9 is a view in which cover 71, yoke 9, 1 st permanent magnet 21, and 2 nd permanent magnet 22 are omitted. The movable conductive part 3 has a 1 st contact member 31 and a 1 st holding member 32. The 1 st contact member 31 includes a movable contact M1. The 1 st holding member 32 holds the 1 st contact member 31.
The 1 st holding member 32 is plate-shaped. The 1 st holding member 32 has conductivity. The 1 st holding member 32 is formed of, for example, a metal plate.
The 1 st holding member 32 includes a base 321, a 1 st extension 322, a 2 nd extension 323, and two arm portions 324. The 1 st contact member 31 is held by the base 321. The 1 st extension 322 extends downward from the base 321. The 2 nd extension part 323 extends leftward from the upper end of the base 321. Two arm portions 324 extend upward from the upper end of the 1 st extension 322. The two arm portions 324 are aligned in the 1 st direction D1, and the base portion 321 is disposed between the two arm portions 324.
The 1 st extension 322 is electrically connected to the 1 st terminal 36 (see fig. 1). The movable contact M1 is electrically connected to the 1 st terminal 36 via the 1 st holding member 32.
As shown in fig. 2, the 1 st contact member 31 includes a head portion 311 and a body portion 312. The head 311 has a circular truncated cone shape. The axial direction of the head 311 is along the 2 nd direction D2. The right surface of the head portion 311 functions as a movable contact M1. The right surface of the 1 st contact member 31 functioning as the movable contact M1 is made of, for example, silver alloy (AgNi or agnno) 2 ) And (4) forming. The 1 st contact member 31 is formed of a copper alloy such as tough pitch copper, for example, at a portion other than the movable contact M1. The surface (right surface) of the 1 st contact member 31 that functions as the movable contact M1 is spherical. The surface (right surface) of the 1 st contact member 31 that functions as the movable contact M1 may be planar or dome-shaped.
The body 312 protrudes from the left end of the head 311. The body 312 is inserted into the through hole of the base 321 of the 1 st holding member 32. The 1 st contact member 31 is fixed to the base 321 by caulking in a state where the body 312 passes through the through hole of the base 321. Thereby, the 1 st contact member 31 is electrically connected to the 1 st holding member 32.
(9) Card board
As shown in fig. 2 and 9, the electromagnetic relay 1 further includes a card board 6. The card 6 is rotatably held by the base 72 of the housing 7.
The card 6 is rotated by the electromagnet device 5 and pushes the 1 st holding member 32. The 1 st holding member 32 is elastically deformed by being pushed by the card 6. Thereby, the movable contact M1 moves from the open position separated from the fixed contact F1 to the closed position contacting the fixed contact F1.
The card 6 is formed of, for example, a synthetic resin. The card 6 has electrical insulation. The card 6 includes a card main body 61, two 1 st projections 62, and a 2 nd projection 63.
The card board main body 61 is formed in a rectangular plate shape. The 1 st end 611 (shaft portion) in the longitudinal direction of the card board main body 61 is held by the bearing portion of the base 72. The card 6 can rotate with the 1 st end 611 of the bearing section held by the base 72 as a fulcrum.
Two 1 st protrusions 62 protrude from the 2 nd end in the longitudinal direction of the card board main body 61. The protruding direction of the two 1 st protrusions 62 is in the right direction. The two 1 st projections 62 correspond one-to-one to the two arm portions 324 of the conductive movable section 3. Each of the 1 st projections 62 presses the corresponding arm portion 324 to elastically deform the conductive movable section 3.
The 2 nd protrusion 63 protrudes from the card board main body 61 in a direction opposite to the 1 st protrusion 62. The 2 nd protrusion 63 is a portion receiving a force from the electromagnet device 5.
(10) Fixed conductive part
The fixed conductive part 4 has a 2 nd contact point member 41, a 2 nd holding member 42, and an extending part 43. The 2 nd contact member 41 includes a fixed contact F1. The 2 nd holding member 42 holds the 2 nd contact member 41. The extension 43 is integrally formed of the same material as the 2 nd holding member 42.
The 2 nd contact member 41, the 2 nd holding member 42, and the extending portion 43 are each formed in a plate shape. The shape of the 2 nd holding member 42 is a curved shape that bulges leftward as viewed from the 1 st direction D1. The 2 nd contact member 41 is disposed at the left end of the 2 nd holding member 42. The left surface of the 2 nd contact member 41 functions as a fixed contact F1.
The extending portion 43 is disposed on the right side of the 2 nd holding member 42. The extending portion 43 extends downward from the right end of the 2 nd holding member 42.
The 2 nd contact member 41 is formed of, for example, silver oxide such as silver tin oxide or silver nickel. The 2 nd holding member 42 and the extension 43 are formed of, for example, a copper alloy. More specifically, the 2 nd holding member 42 and the extending portion 43 are formed of phosphor bronze, a copper alloy containing chromium (copper-chromium alloy), a copper alloy containing tin (copper-tin alloy), or the like.
The 2 nd contact member 41 is pressure-welded to the 2 nd holding member 42. In more detail, the 2 nd contact point member 41 is fixed to the 2 nd holding member 42 by pressure welding to the 2 nd holding member 42 by cold pressure welding, or the like. Further, thereby, the 2 nd contact member 41 is electrically connected to the 2 nd holding member 42.
The extension 43 is electrically connected to the 2 nd terminal 46. The fixed contact F1 is electrically connected to the 2 nd terminal 46 via the 2 nd holding member 42 and the extending portion 43.
(11) Arc extinction effect
The 1 st terminal 36 is electrically connected to the positive side of the dc power supply, and the 2 nd terminal 46 is electrically connected to the negative side of the dc power supply. Therefore, when the movable contact M1 contacts the fixed contact F1, a current flows from the movable contact M1 to the fixed contact F1. Further, the direction of the magnetic field at the contact point portion C0 becomes rearward due to the magnetic fields generated by the 1 st permanent magnet 21 and the 2 nd permanent magnet 22.
When the movable contact M1 moves from the closed position in which it contacts the fixed contact F1 to the open position in which it is separated from the fixed contact F1, an arc may be generated between the movable contact M1 and the fixed contact F1. The direction of the arc current becomes substantially rightward. Therefore, the direction of the lorentz force acting on the arc becomes substantially upward. That is, the arc is drawn upward. This promotes the extinction of the arc.
(12) Electromagnet device
As shown in fig. 2, the electromagnet device 5 is disposed on the left side as viewed from the contact portion C0. The electromagnet device 5 has a coil 51, an armature 52, a transmission part 53, an iron core 54, a coil bobbin 55, a magnetic member 56 (yoke), a hinge spring 57, and a 3 rd permanent magnet 58.
The bobbin 55 is cylindrical in shape. The axial direction of the bobbin 55 is along the 3 rd direction D3. The bobbin 55 is fixed to the base 72. The bobbin 55 has electrical insulation. The coil 51 is made of a wire wound around a bobbin 55.
The core 54 is formed in a cylindrical shape. The iron core 54 is inserted into the inside of the bobbin 55. The axial direction of the core 54 is along the 3 rd direction D3.
The magnetic member 56 is fixed to the base 72. The magnetic member 56 has a 1 st wall portion 561, a 2 nd wall portion 562, and a 3 rd wall portion 563. The 1 st wall portion 561, the 2 nd wall portion 562, and the 3 rd wall portion 563 are each formed in a plate shape.
The thickness direction of the 1 st wall portion 561 is along the 3 rd direction D3. The lower end of the core 54 is fixed to the 1 st wall 561. The 2 nd wall portion 562 protrudes from one end of the 1 st wall portion 561 in a direction substantially perpendicular to the 1 st wall portion 561. The 3 rd wall portion 563 is disposed between the 2 nd wall portion 562 and the coil 51. Between the 2 nd wall portion 562 and the 3 rd wall portion 563, the 3 rd permanent magnet 58 is sandwiched.
The armature 52 has a 1 st plate portion 521 and a 2 nd plate portion 522. The 1 st plate portion 521 is opposed to the 1 st end 541 (upper end) of the core 54. The 2 nd plate portion 522 protrudes from one end of the 1 st plate portion 521 in a direction substantially perpendicular to the 1 st plate portion 521. The intermediate portion 523 including the boundary portion between the 1 st plate portion 521 and the 2 nd plate portion 522 is supported by the 2 nd wall portion 562 of the magnetic member 56. The armature 52 is supported so as to be rotatable about the intermediate portion 523 as a fulcrum between a 1 st position (a position shown in fig. 2) where the 1 st plate portion 521 is separated from the 1 st end 541 of the core 54 and a 2 nd position (a position shown in fig. 3) where the 1 st plate portion 521 is in contact with the 1 st end 541 of the core 54. When the coil 51 is energized, the 1 st plate 521 is attracted toward the core 54, and the armature 52 rotates from the 1 st position to the 2 nd position. At this time, the armature 52 rotates about the axis along the 1 st direction D1. Further, the armature 52 is formed with a through hole 525 (see fig. 10 and 11). The through hole 525 extends from the 2 nd plate portion 522 to the right side surface 5210 (see fig. 10 and 11) of the 1 st plate portion 521. The through hole 525 is formed in a region including the center of the 2 nd plate portion 522 in the 1 st direction D1.
The coil 51 and the iron core 54 constitute an electromagnet E1. That is, the electromagnet device 5 has an electromagnet E1 and an armature 52. When the coil 51 is energized, the armature 52 (the 1 st plate portion 521) is attracted toward the electromagnet E1 by an attraction force generated between the armature and the electromagnet E1. The force attracting the armature 52 acts as a driving force to drive the movable contact M1.
When the coil 51 is energized and the armature 52 is in contact with the iron core 54, a magnetic circuit is formed that is constituted by a path from the 3 rd permanent magnet 58 and the magnetic member 56 through the armature 52, the iron core 54 and back to the magnetic member 56. The magnetic field generated by the coil 51 passes through the magnetic circuit.
The hinge spring 57 is fixed to the 2 nd wall portion 562 of the magnetic member 56. The hinge spring 57 passes through the through hole 525 of the armature 52 (see fig. 10 and 11). The hinge spring 57 is fixed to the armature 52. When the coil 51 is energized and the armature 52 rotates from the 1 st position to the 2 nd position, the hinge spring 57 is pulled by the armature 52 to be elastically deformed. When the coil 51 is in a non-energized state from an energized state, the hinge spring 57 elastically returns, and the armature 52 rotates from the 2 nd position to the 1 st position.
As shown in fig. 2, 10, and 11, the hinge spring 57 includes a spring piece 571 and a folded back portion 572. The spring plate 571 is formed in a vertically long rectangular flat plate shape. The spring plate 571 has a longitudinal direction along the 3 rd direction D3. The folded back portion 572 is located on the 1 st plate portion 521 side of the armature 52 when viewed from the spring piece 571. That is, the folded back part 572 is located leftward with respect to the spring piece 571. The turned back part 572 is connected to the tip (one end in the longitudinal direction, the upper end) of the spring piece 571. The folded part 572 extends in a direction of folding from the tip of the spring plate 571. That is, the folded back portion 572 extends downward from the tip end of the spring plate 571. The folded part 572 is formed by folding one end (upper end) of the hinge spring 57 in the longitudinal direction. More specifically, the folded part 572 is formed by folding and bending one end of the hinge spring 57 in the longitudinal direction. One end of the hinge spring 57 in the longitudinal direction protrudes leftward by a dimension corresponding to the thickness of the folded part 572.
As shown in fig. 11, the spring plate 571 is inserted through the through hole 575. The folded part 572 is provided outside the through hole 575. The folded back portion 572 is provided at a position protruding from the armature 52 when viewed from the 1 st direction D1. More specifically, the folded back portion 572 is disposed above the 1 st plate portion 521 of the armature 52. The tip 5720 of the folded back portion 572 is opposed to the armature 52 (see fig. 11). More specifically, the top end 5720 is opposed to the 1 st plate portion 521 of the armature 52 in the up-down direction.
The left side surface of the spring piece 571 is in contact with the 1 st plate portion 521 of the armature 52, and the hinge spring 57 is pressed rightward by the 1 st plate portion 521 and elastically deformed. The hinge spring 57 supports the armature 52 rotatably by applying a leftward restoring force (spring force) to the armature 52.
Since the folded part 572 of the hinge spring 57 faces the upper surface 5211 of the 1 st plate part 521 in the vertical direction, even if the armature 52 moves upward, the upward movement (upward floating) of the armature 52 can be suppressed by the upper surface 5211 of the 1 st plate part 521 coming into contact with the folded part 572. Here, in a state where the intermediate portion 523 of the armature 52 is in contact with the corner 5620 of the 2 nd wall portion 562, the tip 5720 (lower end) of the folded back portion 572 is not in contact with the upper surface 5211 of the 1 st plate portion 521. The distance between the tip 5720 of the folded part 572 and the upper surface 5211 of the 1 st plate part 521 is preferably about 10 to 15 μm. However, the tip 5720 of the folded part 572 may contact the upper surface 5211 of the 1 st plate part 521.
The transmission part 53 is attached to the 2 nd plate part 522 of the armature 52. The transmission part 53 is formed of, for example, synthetic resin. The transmission portion 53 has electrical insulation. The transmission part 53 is opposed to the 2 nd projection 63 of the card 6. When the armature 52 rotates from the 1 st position to the 2 nd position, the transmission portion 53 rotates in conjunction therewith, and presses the 2 nd projection 63 of the card 6. At this time, the card 6 rotates about the 1 st end 611 of the card main body 61. Then, the two 1 st protrusions 62 of the card 6 press the corresponding arm portions 324 (see fig. 9) of the conductive movable portion 3, and elastically deform the conductive movable portion 3. Thereby, the movable contact M1 moves from the open position separated from the fixed contact F1 to the closed position contacting the fixed contact F1.
When the coil 51 is energized to a non-energized state, the armature 52 rotates from the 2 nd position to the 1 st position, and the movable conductive portion 3 elastically returns, so that the movable contact M1 moves to the open position.
In the electromagnet device 5, a portion (the 1 st plate portion 521) of the armature 52 that faces the electromagnet E1 (the coil 51 and the core 54) is disposed on one side (upper side) in the 3 rd direction D3 when viewed from the electromagnet E1. The coupling piece 93 of the yoke 9 is disposed on the one side (upper side) in the 3 rd direction D3 when viewed from the contact portion C0.
(13) Electromagnetic relay unit
As shown in fig. 6, the electromagnetic relay unit U1 includes a plurality of electromagnetic relays 1 (two in fig. 6). The structures of the two electromagnetic relays 1 are identical to each other. Hereinafter, in order to distinguish the two electromagnetic relays 1, one electromagnetic relay 1 may be referred to as an electromagnetic relay 1A, and the other electromagnetic relay 1 may be referred to as an electromagnetic relay 1B. The 1 st direction D1, the 2 nd direction D2, and the 3 rd direction D3 are defined based on the structure of the electromagnetic relay 1A.
The two electromagnetic relays 1A, 1B are adjacent to each other in the 1 st direction D1. At least a part of the yoke 9 of the electromagnetic relay 1A and at least a part of the yoke 9 of the electromagnetic relay 1B are opposed in the 1 st direction D1. Further, the yokes 9 of the two electromagnetic relays 1A, 1B adjacent to each other are in contact with each other. In more detail, the front surface 910 of the 1 st side piece 91 of the yoke 9 of the electromagnetic relay 1A is in contact with the rear surface 920 of the 2 nd side piece 92 of the yoke 9 of the electromagnetic relay 1B. That is, the yoke 9 of the electromagnetic relay 1A is in surface contact with the yoke 9 of the electromagnetic relay 1B.
Two electromagnetic relays 1A and 1B adjacent to each other are disposed at different positions from each other in the 2 nd direction D2. More specifically, the center of the electromagnetic relay 1A is located on the right side of the center of the electromagnetic relay 1B when viewed from the 3 rd direction D3.
The directions of the two electromagnetic relays 1A, 1B coincide. That is, both the electromagnetic relays 1A, 1B are arranged in a direction in which the electromagnet device 5 is located on the left when viewed from the contact portion C0. Both the electromagnetic relays 1A and 1B are arranged in a direction in which the connecting piece 93 of the yoke 9 is positioned upward when viewed from the contact portion C0.
Here, one of both sides (rear side) in the 1 st direction D1 is set as the positive side of the X axis. In fig. 6, an X axis parallel to the 1 st direction D1 and a Y axis parallel to the 2 nd direction D2 are illustrated. The arrows in the drawings representing the X and Y axes are labeled for illustration only and are not accompanied by entities.
In each of the two electromagnetic relays 1A, 1B adjacent to each other, the direction of the magnetic field between the 1 st permanent magnet 21 and the 2 nd permanent magnet 22 (the direction of arrows H1, H2 in fig. 6) is a direction along the 1 st direction D1 and toward the positive side of the X axis. That is, in each of the two electromagnetic relays 1A, 1B adjacent to each other, the direction of the magnetic field between the 1 st permanent magnet 21 and the 2 nd permanent magnet 22 is rearward.
Therefore, compared to the case where the direction of the magnetic field of the electromagnetic relay 1A is opposite to the direction of the magnetic field of the electromagnetic relay 1B, the magnetic flux is easily moved from the yoke 9 of one electromagnetic relay 1 to the yoke 9 of the other electromagnetic relay 1 of the two electromagnetic relays 1A, 1B. Therefore, the possibility of leakage of magnetic flux (magnetic field) to a position separated from the yoke 9 can be reduced. In particular, it is possible to reduce the possibility that the magnetic flux leaking from the yoke 9 of one electromagnetic relay 1 of the two electromagnetic relays 1A, 1B leaks to the periphery of the electromagnet device 5 of the other electromagnetic relay 1.
In each of the electromagnetic relays 1A and 1B, a contact portion C0 is disposed between the 1 st permanent magnet 21 and the 2 nd permanent magnet 22. In each of the electromagnetic relays 1A and 1B, the direction of the magnetic field around the contact portion C0 is the same direction (backward). In the electromagnetic relay unit U1 of the present embodiment, it is possible to suppress a decrease in the strength of the magnetic field around the contact portion C0, as compared with a case where the direction of the magnetic field of the electromagnetic relay 1A is opposite to the direction of the magnetic field of the electromagnetic relay 1B.
In the electromagnetic relay unit U1, a plurality of electromagnetic relays 1 may also be coupled to each other. Alternatively, a plurality of electromagnetic relays 1 may be held by a predetermined member.
(14) Advantages of the invention
The magnetic fields generated by the 1 st permanent magnet 21 and the 2 nd permanent magnet 22 of the electromagnetic relay 1A may leak to the periphery of the electromagnet device 5 of each of the electromagnetic relays 1A and 1B, and may interfere with the operation of the electromagnet device 5. That is, there is a possibility that the attractive force between the armature 52 of the electromagnet device 5 and the electromagnet E1 is increased or decreased by the leakage magnetic field. Thus, the magnitude of the voltage applied to the coil 51, which is required to rotate the armature 52 from the 1 st position to the 2 nd position, may be higher or lower than the design value. Further, there is a possibility that the magnitude of the voltage applied to the coil 51, which is required to return the armature 52 from the 2 nd position to the 1 st position, is higher or lower than the design value. Therefore, the opening and closing operation of the contact portion C0 accompanying the rotation of the armature 52 may become unstable.
According to the present embodiment, since the coupling piece 93 of the yoke 9 is disposed at a position relatively close to the electromagnet device 5, it is possible to reduce the possibility that the magnetic field generated by the 1 st permanent magnet 21 and the 2 nd permanent magnet 22 of the electromagnetic relay 1A leaks around the electromagnet device 5 of each of the electromagnetic relays 1A and 1B.
Further, in the electromagnetic relay unit U1, at least a part of the yoke 9 of the electromagnetic relay 1A and at least a part of the yoke 9 of the electromagnetic relay 1B are opposed in the 1 st direction D1, and therefore the magnetic field passing through the yoke 9 of the electromagnetic relay 1A easily passes through the yoke 9 of the electromagnetic relay 1B. Therefore, the possibility of leakage of the magnetic field to the outside of the yoke 9 of each electromagnetic relay 1 can be reduced. In the present embodiment, the yoke 9 of the electromagnetic relay 1A is in contact with the yoke 9 of the electromagnetic relay 1B, and therefore the leakage magnetic field can be further reduced.
As described above, according to the present embodiment, it is possible to obtain an effect of reducing the possibility that the magnetic fields generated by the 1 st permanent magnet 21 and the 2 nd permanent magnet 22 of the electromagnetic relay 1A affect the operation of the electromagnetic relays 1A and 1B. Similarly, according to the present embodiment, the effect of reducing the possibility that the magnetic fields generated by the 1 st permanent magnet 21 and the 2 nd permanent magnet 22 of the electromagnetic relay 1B affect the operation of the electromagnetic relays 1A and 1B can be obtained.
In addition, two electromagnetic relays 1A, 1B adjacent to each other are disposed at different positions from each other in the 2 nd direction D2. Therefore, as shown in fig. 6, the distance between the electromagnet device 5 of the electromagnetic relay 1A and the 1 st and 2 nd permanent magnets 21, 22 of the electromagnetic relay 1B becomes comparatively short. However, the yoke 9 can reduce the possibility that the magnetic fields generated from the 1 st permanent magnet 21 and the 2 nd permanent magnet 22 of the electromagnetic relay 1B leak to the periphery of the electromagnet device 5 of the electromagnetic relay 1A. Therefore, even in the arrangement shown in fig. 6, the influence of the leakage magnetic field on the operation of the electromagnetic relay 1A is relatively small.
(15) Example of operation
Next, an operation example of the electromagnetic relay 1 will be described.
As shown in fig. 2, in a state where the coil 51 is not energized, the movable contact M1 is in the off position. When the coil 51 is energized, an attractive force is generated between the 1 st plate portion 521 of the armature 52 and the iron core 54 by a magnetic field generated by the coil 51. Due to the attractive force, the armature 52 rotates so that the 1 st plate portion 521 moves toward the iron core 54. That is, at this time, the armature 52 rotates from the 1 st position to the 2 nd position.
When the armature 52 rotates from the 1 st position to the 2 nd position, the card 6 is driven, and the movable conductive portion 3 is driven by the card 6. That is, the card 6 rotates about the 1 st end 611, and the two 1 st protrusions 62 of the card 6 press the two arms 324 of the conductive movable section 3 (see fig. 9), so that the conductive movable section 3 elastically deforms so that the movable contact M1 moves from the open position to the closed position (the position shown in fig. 3).
After the movable contact M1 reaches the closed position and comes into contact with the fixed contact F1, when the two 1 st protrusions 62 of the card 6 further push the two arm portions 324 of the movable conductive part 3, the two arm portions 324 absorb the force from the two 1 st protrusions 62 by elastic deformation. That is, the two arm portions 324 have elasticity, so that there is room for further rotation of the card board 6 even after the movable contact point M1 reaches the closed position. Thereby, the contact pressure between the movable contact M1 and the fixed contact F1 can be appropriately maintained.
When the coil 51 is in the non-energized state, the attraction force between the 1 st plate 521 and the core 54 disappears. Then, the armature 52 rotates from the 2 nd position to the 1 st position due to the elastic force of the hinge spring 57. The movable conductive part 3 is elastically restored so that the movable contact M1 moves from the closed position to the open position. Accordingly, the card 6 returns to the position before the coil 51 is energized.
(16) Mounting work of hinge spring
Next, the operation of attaching the hinge spring 57 will be described.
The worker who performs the mounting operation inserts the hinge spring 57 into the through hole 525 of the armature 52 from below to above (see fig. 10). At this time, the right side surface 5210 of the 1 st plate portion 521 of the armature 52 may contact the left side surface of the folded portion 572 of the hinge spring 57. Then, the hinge spring 57 receives a rightward force from the right side surface 5210, and the spring piece 571 deflects (elastically deforms) rightward.
Then, the operator further moves the spring piece 571 upward, and as shown in fig. 11, when the tip end 5720 (lower end) of the turned-back portion 572 passes over the upper end of the 1 st plate portion 521, the force applied to the turned-back portion 572 becomes weak, and therefore the amount of elastic deformation of the spring piece 571 decreases. That is, the spring plate 571 elastically returns to the left direction. Thereafter, the operator fixes the spring piece 571 to the 2 nd wall portion 562.
In this way, in the process of inserting the hinge spring 57 into the through hole 525, the spring piece 571 is automatically deflected by the reaction force applied from the right side surface 5210, and therefore, the workability of the mounting operation of the hinge spring 57 to the armature 52 can be improved. After the mounting operation is completed, the folded-back portion 572 faces the upper surface 5211 of the 1 st plate portion 521 in the longitudinal direction (vertical direction) of the folded-back portion 572, and therefore, the spring pieces 571 can be prevented from coming out of the through holes 525.
The left side surface of the folded part 572 may be an inclined surface inclined from the lower end to the upper end of the folded part 572. More specifically, the left side surface of the folded part 572 may be inclined such that the distance from the spring plate 571 increases as the distance from the upper end of the hinge spring 57 increases. That is, the folded part 572 and the spring piece 571 may have an inverted V shape. In this configuration, when the left side surface of the folded part 572 comes into contact with the right side surface 5210 of the 1 st plate part 521 (see fig. 10), the spring piece 571 that receives a rightward force from the right side surface 5210 deflects rightward (elastically deforms) as the hinge spring 57 moves upward.
(modification of embodiment)
Modifications of the embodiment are described below. The following modifications can also be implemented in appropriate combinations.
Two electromagnetic relays 1A and 1B adjacent to each other may be arranged at the same position in the 2 nd direction D2. That is, as shown in fig. 12, two electromagnetic relays 1A and 1B adjacent to each other may be arranged such that their centers are aligned along the 1 st direction D1 when viewed from the 3 rd direction D3. Further, the two electromagnetic relays 1A and 1B adjacent to each other may be arranged such that the centers of the respective yokes 9 are aligned along the 1 st direction D1 when viewed from the 3 rd direction D3.
The electromagnetic relay unit U1 may include three or more electromagnetic relays 1.
In the electromagnetic relay unit U1, two or more electromagnetic relays 1 of the plurality of electromagnetic relays 1 may share the housing 7. That is, the contact portions C0, the 1 st permanent magnet 21, the 2 nd permanent magnet 22, and the like of the two or more electromagnetic relays 1 may be housed in one case 7, and the yokes 9 of the two or more electromagnetic relays 1 may be held.
The region R1 between the 1 st permanent magnet 21 and the 1 st side plate 91 and the region R2 between the 2 nd permanent magnet 22 and the 2 nd side plate 92 may not be the region occupied by the case 7 (the cover main body 711). The regions R1, R2 may be regions (voids) occupied by air, for example. That is, the 1 st permanent magnet 21 and the 1 st side sheet 91 may face each other with a gap therebetween. The 2 nd permanent magnet 22 and the 2 nd side plate 92 may face each other with a gap therebetween. The magnetic permeability of air is lower than that of the yoke 9.
The 1 st side piece 91, the 2 nd side piece 92, and the connecting piece 93 of the yoke 9 are not necessarily integrally formed of the same material. The 1 st side sheet 91, the 2 nd side sheet 92, and the connecting sheet 93 may be formed of different materials. Alternatively, one of the 1 st side sheet 91, the 2 nd side sheet 92 and the connecting sheet 93 may be formed of a material different from the remaining two. In these cases, the magnetic permeability of the region R1 is preferably lower than that of the 1 st side sheet 91. Preferably, the magnetic permeability of the region R2 is lower than that of the 2 nd side sheet 92. Preferably, the magnetic permeability of the case 7 is lower than the magnetic permeability of any one of the 1 st side plate 91, the 2 nd side plate 92, and the connecting plate 93.
Instead of the through holes 911 and 921, the yoke 9 may have a recess into which the protrusion 714 is inserted.
Instead of the through holes 911 and 921, the yoke 9 may have protrusions. Cover 71 may have a through hole or a recess into which a protrusion of yoke 9 is inserted, instead of protrusion 714.
The yoke 9 may be housed in the case 7. However, also in this case, it is preferable to secure the distance between the yoke 9 and the 1 st and 2 nd permanent magnets 21, 22. When the yoke 9 is housed in the case 7, the yoke 9 is preferably covered with an electrically insulating member in order to ensure electrical insulation between the yoke 9 and the fixed conductive portion 4.
In the electromagnetic relay unit U1, the yokes 9 of the two electromagnetic relays 1 adjacent to each other do not necessarily have to be in contact with each other, and may be arranged with a space between the yokes 9.
In the electromagnetic relay unit U1, it is also possible that the direction of one electromagnetic relay 1 of two electromagnetic relays 1 adjacent to each other is the direction opposite to the direction of the other electromagnetic relay 1. In this case, in order to align the directions of the magnetic fields generated by the 1 st permanent magnet 21 and the 2 nd permanent magnet 22, it is preferable that the directions of the magnetic poles of the 1 st permanent magnet 21 and the 2 nd permanent magnet 22 of one electromagnetic relay 1 are set to the opposite directions from the embodiments.
In the embodiment, the 1 st contact member 31 including the movable contact M1 is attached to the 1 st holding member 32 by caulking, but the present invention is not limited thereto, and the 1 st contact member 31 may be pressure-welded to the 1 st holding member 32. Alternatively, the 1 st contact member 31 and the 1 st holding member 32 may be integrally formed of the same material.
In the embodiment, the 2 nd contact member 41 including the fixed contact F1 is configured to be pressure-welded to the 2 nd holding member 42, but is not limited thereto, and the 2 nd contact member 41 may be attached to the 2 nd holding member 42 by caulking or the like. Alternatively, the 2 nd contact member 41 and the 2 nd holding member 42 may be integrally formed of the same material.
Movable contact M1 may be disposed on the right side with respect to fixed contact F1.
Fixed contact F1 and movable contact M1 may be arranged along 3 rd direction D3.
The electromagnetic relay 1 is not limited to the hinge type relay. The electromagnetic relay 1 may be a plunger-type relay in which a movable element corresponding to the movable conductive part 3 linearly moves to bring a movable contact and a fixed contact into contact with each other and into a separated state.
(conclusion)
According to the embodiments described above, the following aspects are disclosed.
An electromagnetic relay (1) according to claim 1 is provided with a contact portion (C0), an electromagnet device (5), a 1 st permanent magnet (21), a 2 nd permanent magnet (22), and a yoke (9). The contact section (C0) has a fixed contact (F1) and a movable contact (M1). The movable contact (M1) faces the fixed contact (F1). The electromagnet device (5) generates a driving force that drives the movable contact (M1). The 1 st permanent magnet (21) is disposed on one side in the 1 st direction (D1) with respect to the contact portion (C0). The 2 nd permanent magnet (22) is disposed on the other side in the 1 st direction (D1) with respect to the contact portion (C0). The yoke (9) has a 1 st side piece (91), a 2 nd side piece (92), and a connecting piece (93). The connecting piece (93) connects the 1 st side piece (91) and the 2 nd side piece (92). The contact portion (C0) and the electromagnet device (5) are arranged along the 2 nd direction (D2). The 2 nd direction (D2) is orthogonal to the 1 st direction (D1). The 1 st permanent magnet (21) is disposed between the 1 st side piece (91) and the contact portion (C0). The 2 nd permanent magnet (22) is disposed between the 2 nd side piece (92) and the contact portion (C0). The connecting piece (93) and the contact portion (C0) are arranged along the 3 rd direction (D3). The 3 rd direction (D3) is orthogonal to both the 1 st direction (D1) and the 2 nd direction (D2).
According to the above configuration, magnetic interference between the plurality of electromagnetic relays (1) can be suppressed. That is, in the electromagnetic relay (1), the connection piece (93) is arranged at a position relatively close to the electromagnet device (5) as compared with a structure in which the connection piece (93) of the yoke (9) is arranged on an extension of a line segment from the electromagnet device (5) toward the contact portion (C0). The yoke (9) also prevents the magnetic fields generated by the 1 st permanent magnet (21) and the 2 nd permanent magnet (22) from leaking to the outside. Therefore, when a plurality of electromagnetic relays (1) are arranged in the same direction, the possibility of leakage of the magnetic field generated by the 1 st permanent magnet (21) and the 2 nd permanent magnet (22) of one electromagnetic relay (1) to the periphery of the electromagnet device (5) of the other electromagnetic relay (1) (the 2 nd electromagnetic relay) can be reduced. Thus, the influence of the leakage magnetic field on the operation of the electromagnet device (5) of the No. 2 electromagnetic relay can be reduced.
In addition, in the electromagnetic relay (1) according to claim 2, in addition to the first aspect, regions (R1, R2) having a lower magnetic permeability than the yoke (9) are provided at least one of between the 1 st permanent magnet (21) and the 1 st side plate (91) and between the 2 nd permanent magnet (22) and the 2 nd side plate (92).
According to the above configuration, the distance between the 1 st permanent magnet (21) and the 1 st side plate (91) and the distance between the 2 nd permanent magnet (22) and the 2 nd side plate (92) are larger than in the case where the 1 st permanent magnet (21) and the 1 st side plate (91) are in direct contact and the 2 nd permanent magnet (22) and the 2 nd side plate (92) are in direct contact. This improves the effect of suppressing leakage of the magnetic field generated by the 1 st permanent magnet (21) and the 2 nd permanent magnet (22).
The electromagnetic relay (1) according to claim 3 is characterized by further comprising a housing (7) in addition to the electromagnetic relay according to claim 2. The shell (7) has lower magnetic permeability compared with the magnet yoke (9). The housing (7) houses the contact section (C0), the 1 st permanent magnet (21), and the 2 nd permanent magnet (22). The yoke (9) is held on the outer surface of the housing (7).
According to the structure, the distance between the 1 st permanent magnet (21) and the 1 st side piece (91) and the distance between the 2 nd permanent magnet (22) and the 2 nd side piece (92) can be ensured by utilizing the thickness of the shell (7).
In addition, in the electromagnetic relay (1) according to claim 4, in addition to the 3 rd aspect, at least one of a surface across the outer surface of the housing (7) and the outer surface of the 1 st side plate (91) and a surface across the outer surface of the housing (7) and the outer surface of the 2 nd side plate (92) is planar.
According to the above configuration, a plurality of electromagnetic relays (1) are arranged without a gap (or with a relatively small gap).
In addition, in the electromagnetic relay (1) according to claim 5, the electromagnet device (5) includes an electromagnet (E1) and an armature (52) in addition to any one of the embodiments 1 to 4. The armature (52) is attracted toward the electromagnet (E1) by an attraction force generated between the armature and the electromagnet (E1). A portion (1 st plate portion 521) of the armature (52) that faces the electromagnet (E1) is disposed on one side in the 3 rd direction (D3) when viewed from the electromagnet (E1). The connecting piece (93) is arranged on the side in the 3 rd direction (D3) when viewed from the contact part (C0).
According to the above configuration, since the armature (52) and the connecting piece (93) are disposed on the same side, the possibility of leakage of the magnetic field generated by the 1 st permanent magnet (21) and the 2 nd permanent magnet (22) to the periphery of the armature (52) can be reduced.
In addition, in the electromagnetic relay (1) according to claim 6, the electromagnet device (5) includes an electromagnet (E1), an armature (52), and a hinge spring (57) in addition to any one of the embodiments 1 to 5. The armature (52) is attracted to the electromagnet (E1) by an attraction force generated between the armature and the electromagnet (E1), and rotates about an axis extending in the 1 st direction (D1). The hinge spring (57) rotatably supports the armature (52). The hinge spring (57) has a spring piece (571) and a folded-back part (572) extending in a direction folded back from the tip of the spring piece (571). The folded-back portion (572) is provided at a position protruding from the armature (52) when viewed from the 1 st direction (D1). The tip (5720) of the folded back portion (572) is opposed to the armature (52).
According to the above configuration, the spring piece (571) can be automatically deflected by the contact of the folded-back portion (572) with the armature (52), and therefore, the workability of the attachment operation of the hinge spring (57) to the armature (52) can be improved.
The structure other than the 1 st embodiment is not essential to the electromagnetic relay (1) and can be omitted as appropriate.
An electromagnetic relay unit (U1) according to claim 7 includes a plurality of electromagnetic relays (1). Each of the plurality of electromagnetic relays (1) includes a contact portion (C0), an electromagnet device (5), a 1 st permanent magnet (21), a 2 nd permanent magnet (22), and a yoke (9). The contact section (C0) has a fixed contact (F1) and a movable contact (M1). The movable contact (M1) faces the fixed contact (F1). The electromagnet device (5) generates a driving force that drives the movable contact (M1). The 1 st permanent magnet (21) is disposed on one side in the 1 st direction (D1) with respect to the contact portion (C0). The 2 nd permanent magnet (22) is disposed on the other side in the 1 st direction (D1) with respect to the contact portion (C0). The yoke (9) has a 1 st side piece (91), a 2 nd side piece (92), and a connecting piece (93). The connecting piece (93) connects the 1 st side piece (91) and the 2 nd side piece (92). In each of the plurality of electromagnetic relays (1), the contact portion (C0) and the electromagnet device (5) are arranged along the 2 nd direction (D2). The 2 nd direction (D2) is orthogonal to the 1 st direction (D1). In each of the plurality of electromagnetic relays (1), the 1 st permanent magnet (21) is disposed between the 1 st side piece (91) and the contact portion (C0). In each of the plurality of electromagnetic relays (1), the 2 nd permanent magnet (22) is disposed between the 2 nd side plate (92) and the contact portion (C0). In each of the plurality of electromagnetic relays (1), the connecting piece (93) and the contact portion (C0) are arranged along the 3 rd direction (D3). The 3 rd direction (D3) is orthogonal to both the 1 st direction (D1) and the 2 nd direction (D2). Two electromagnetic relays (1) adjacent to each other among the plurality of electromagnetic relays (1) are arranged such that at least a part of each yoke (9) faces in the 1 st direction (D1).
According to the above configuration, magnetic interference between the plurality of electromagnetic relays (1) can be suppressed.
In addition, in the electromagnetic relay unit (U1) of the 8 th aspect, the yokes (9) of two electromagnetic relays (1) adjacent to each other are in contact with each other in addition to the 7 th aspect.
According to the above configuration, the effect of suppressing magnetic interference between the plurality of electromagnetic relays (1) is improved as compared with the case where the two yokes (9) do not contact each other.
In addition, in the electromagnetic relay unit (U1) according to the 9 th aspect, in addition to the 7 th or 8 th aspect, two electromagnetic relays (1) adjacent to each other are disposed at positions different from each other in the 2 nd direction (D2).
According to the above configuration, a plurality of arrangements of the plurality of electromagnetic relays (1) can be made.
In addition, in the electromagnetic relay unit (U1) according to the 10 th aspect, in addition to any one of the 7 th to 9 th aspects, each of the plurality of electromagnetic relays (1) further includes a case (7) having a lower magnetic permeability than the yoke (9). In each of the plurality of electromagnetic relays (1), a housing (7) houses a contact portion (C0), a 1 st permanent magnet (21), and a 2 nd permanent magnet (22).
According to the above configuration, unlike the case where a plurality of electromagnetic relays (1) are concentrated on one housing (7), a plurality of electromagnetic relays (1) can be individually arranged.
In addition, in the electromagnetic relay unit (U1) according to claim 11, in addition to the electromagnetic relay unit according to claim 10, the yoke (9) is held on the outer surface of the housing (7) in each of the plurality of electromagnetic relays (1).
According to the above structure, the distance between the 1 st permanent magnet (21) and the 1 st side piece (91) and the distance between the 2 nd permanent magnet (22) and the 2 nd side piece (92) can be ensured by the thickness of the housing (7).
In addition, in the electromagnetic relay unit (U1) according to the 12 th aspect, in addition to any one of the 7 th to 11 th aspects, one of both sides in the 1 st direction (D1) is set as a positive side of the X axis. In each of two electromagnetic relays (1) adjacent to each other, the direction of the magnetic field between the 1 st permanent magnet (21) and the 2 nd permanent magnet (22) is a direction along the 1 st direction (D1) and toward the positive side of the X axis.
According to the above configuration, since the magnetic flux is relatively easily moved between the yokes (9) of the two electromagnetic relays (1) adjacent to each other, the possibility of leakage of the magnetic flux to a position separated from the yokes (9) can be reduced.
The structure other than the 7 th aspect is not essential to the electromagnetic relay unit (U1), and can be omitted as appropriate.
Description of the reference numerals
1. An electromagnetic relay; 5. an electromagnet arrangement; 7. a housing; 9. a yoke; 21. 1 st permanent magnet; 22. a 2 nd permanent magnet; 52. an armature; 57. a hinge spring; 91. 1 st side sheet; 92. a 2 nd side panel; 93. a connecting sheet; 521. 1 st plate portion (opposite portion); 571. a spring plate; 572. a fold-back portion; 5720. a top end; c0, a contact part; d1, the 1 st direction; d2, the 2 nd direction; d3, 3 rd direction; e1, an electromagnet; f1, fixing a contact; m1, a movable contact; r1, R2, and a region; u1, electromagnetic relay unit.

Claims (12)

1. An electromagnetic relay, wherein,
the electromagnetic relay includes:
a contact point portion having a fixed contact point and a movable contact point opposing the fixed contact point;
an electromagnet device that generates a driving force that drives the movable contact;
a 1 st permanent magnet disposed on one side in a 1 st direction with respect to the contact portion;
a 2 nd permanent magnet disposed on the other side in the 1 st direction with respect to the contact portion; and
a yoke having a 1 st side plate, a 2 nd side plate, and a connecting piece connecting the 1 st side plate and the 2 nd side plate,
the contact portion and the electromagnet device are arranged along a 2 nd direction orthogonal to the 1 st direction,
the 1 st permanent magnet is disposed between the 1 st side piece and the contact portion,
the 2 nd permanent magnet is disposed between the 2 nd side piece and the contact portion,
the connecting piece and the contact portion are arranged along a 3 rd direction orthogonal to both the 1 st direction and the 2 nd direction.
2. The electromagnetic relay of claim 1,
at least one of between the 1 st permanent magnet and the 1 st side plate and between the 2 nd permanent magnet and the 2 nd side plate is provided with a region having a lower magnetic permeability than the yoke.
3. The electromagnetic relay of claim 2, wherein,
the electromagnetic relay further includes a case having a lower magnetic permeability than the yoke, housing the contact portion, the 1 st permanent magnet, and the 2 nd permanent magnet,
the yoke is held on an outer surface of the housing.
4. The electromagnetic relay of claim 3,
at least one of a face across an outer surface of the outer shell and an outer surface of the 1 st side panel and a face across an outer surface of the outer shell and an outer surface of the 2 nd side panel is planar.
5. The electromagnetic relay according to any one of claims 1 to 4, wherein,
the electromagnet device has an electromagnet and an armature attracted toward the electromagnet by an attraction force generated between the electromagnet and the armature,
a portion of the armature opposite to the electromagnet is arranged on one side in the 3 rd direction when viewed from the electromagnet,
the connecting piece is arranged on the one side in the 3 rd direction when viewed from the contact portion.
6. The electromagnetic relay according to any one of claims 1 to 5,
the electromagnet device has an electromagnet, an armature attracted to the electromagnet by an attraction force generated between the electromagnet and rotating about an axis along the 1 st direction, and a hinge spring rotatably supporting the armature,
the hinge spring has a spring piece and a folded part extending from the top end of the spring piece in the direction of folding,
the folded-back portion is provided at a position protruding from the armature when viewed from the 1 st direction,
the tip of the folded-back portion is opposed to the armature.
7. An electromagnetic relay unit, wherein,
the electromagnetic relay unit includes a plurality of electromagnetic relays,
the electromagnetic relay includes:
a contact portion having a fixed contact and a movable contact opposed to the fixed contact;
an electromagnet device that generates a driving force that drives the movable contact;
a 1 st permanent magnet disposed on one side in a 1 st direction with respect to the contact portion;
a 2 nd permanent magnet disposed on the other side in the 1 st direction with respect to the contact portion; and
a yoke having a 1 st side plate, a 2 nd side plate, and a connecting piece connecting the 1 st side plate and the 2 nd side plate,
in each of the plurality of electromagnetic relays,
the contact portion and the electromagnet device are arranged along a 2 nd direction orthogonal to the 1 st direction,
the 1 st permanent magnet is disposed between the 1 st side piece and the contact portion,
the 2 nd permanent magnet is arranged between the 2 nd side piece and the contact portion,
the connecting piece and the contact part are arranged along a 3 rd direction orthogonal to both the 1 st direction and the 2 nd direction,
two electromagnetic relays adjacent to each other among the plurality of electromagnetic relays are arranged such that at least a part of the yoke of each electromagnetic relay faces in the 1 st direction.
8. The electromagnetic relay unit of claim 7,
the respective yokes of the two electromagnetic relays adjacent to each other are in contact with each other.
9. The electromagnetic relay unit according to claim 7 or 8, wherein,
the two electromagnetic relays adjacent to each other are disposed at positions different from each other in the 2 nd direction.
10. The electromagnetic relay unit according to any one of claims 7 to 9,
each of the plurality of electromagnetic relays further includes a case having a lower magnetic permeability than the yoke,
in each of the plurality of electromagnetic relays,
the housing houses the contact portion, the 1 st permanent magnet, and the 2 nd permanent magnet.
11. The electromagnetic relay unit of claim 10,
in each of the plurality of electromagnetic relays,
the yoke is held on an outer surface of the housing.
12. The electromagnetic relay unit according to any one of claims 7 to 11,
one of both sides in the 1 st direction is set as a positive side of the X axis,
in each of the two electromagnetic relays adjacent to each other, a direction of a magnetic field between the 1 st permanent magnet and the 2 nd permanent magnet is a direction along the 1 st direction and toward the positive side of the X axis.
CN202180050425.1A 2020-09-07 2021-07-19 Electromagnetic relay and electromagnetic relay unit Pending CN115943472A (en)

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JP2020-150037 2020-09-07
PCT/JP2021/027030 WO2022049912A1 (en) 2020-09-07 2021-07-19 Electromagnetic relay and electromagnetic relay unit

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