阅读说明：本技术 电磁继电器 (Electromagnetic relay ) 是由 山形胜利 于 2018-12-20 设计创作，主要内容包括：本公开的课题在于提供一种具备用于检测一可动触点与一固定触点接触(或分开)的时刻和另一可动触点与另一固定触点接触(或分开)的时刻之间的偏差的结构的电磁继电器。可动触点部(9)的位移部(90)以与一对可动触点(M1、M2)导通的方式与一对可动触点(M1、M2)相连。衔铁(3)驱动可动触点部(9)。衔铁(3)的吸附部位(AD1)吸附于电磁体(E1)。使位移部(90)的局部(暴露部94)暴露的开口部(842)的内部空间与预定的平面(P1)交叉。对于预定的平面(P1)而言,与一对可动触点(M1、M2)排列的排列方向(第1方向D1)正交,通过吸附部位(AD1)的排列方向上的两端(T1、T2)间的中心(C1)。(The present disclosure provides an electromagnetic relay having a structure for detecting a deviation between a timing at which a movable contact comes into contact with (or separates from) a fixed contact and a timing at which another movable contact comes into contact with (or separates from) another fixed contact. A displacement section (90) of the movable contact section (9) is connected to a pair of movable contacts (M1, M2) so as to be electrically connected to the pair of movable contacts (M1, M2). The armature (3) drives the movable contact part (9). The adsorption site (AD1) of the armature (3) is adsorbed to the electromagnet (E1). The internal space of the opening (842) in which a part (exposed part 94) of the displacement part (90) is exposed intersects a predetermined plane (P1). The predetermined plane (P1) is orthogonal to the arrangement direction (1 st direction D1) in which the pair of movable contacts (M1, M2) are arranged, and passes through the center (C1) between both ends (T1, T2) in the arrangement direction of the adsorption site (AD 1).)

1. An electromagnetic relay is characterized in that the electromagnetic relay is provided with a coil,

the electromagnetic relay includes:

a pair of fixed contacts;

a movable contact point portion having a pair of movable contact points that correspond one-to-one to the pair of fixed contact points, and a displacement portion that is connected to the pair of movable contact points so as to be electrically connected to the pair of movable contact points and is displaceable integrally with the pair of movable contact points;

a covering portion that covers the displacement portion;

an electromagnet having an excitation coil; and

an armature attracted to the electromagnet by an electromagnetic force of the electromagnet to drive the movable contact portions so that the pair of movable contacts are brought into contact with or separated from corresponding ones of the pair of fixed contacts, respectively,

the armature has an adsorption portion adsorbed to the electromagnet by an electromagnetic force of the electromagnet,

an opening portion for partially exposing the displacement portion is formed in the covering portion,

the internal space of the opening portion intersects with a predetermined plane orthogonal to the arrangement direction of the pair of movable contacts,

the predetermined plane passes through a center between both ends of the adsorption sites in the arrangement direction.

2. The electromagnetic relay according to claim 1,

the midpoint between the centers of the pair of movable contacts is located on the predetermined plane.

3. The electromagnetic relay according to claim 1 or 2,

the opening portion is formed on the side opposite to the electromagnet side in the direction in which the displacement portion and the electromagnet are aligned.

4. An electromagnetic relay according to any one of claims 1 to 3,

the electromagnetic relay further includes a stopper that contacts at least one of the movable contact portion and the armature from a side opposite to the electromagnet side in a direction in which the attraction portion and the electromagnet are aligned when the pair of movable contacts are separated from the pair of fixed contacts,

the stopper intersects the predetermined plane.

5. The electromagnetic relay according to any one of claims 1 to 4,

the electromagnetic relay further includes a movable spring fixed with respect to the armature and electrically insulated with respect to the movable contact portion,

the movable spring is fixed to the movable contact portion via the covering portion, and deforms in accordance with displacement of the armature, thereby displacing the movable contact portion.

6. The electromagnetic relay according to any one of claims 1 to 5,

the displacement portion includes a pair of displacement springs that correspond one-to-one to the pair of movable contacts,

the pair of displacement springs are connected to the pair of movable contacts in conduction with the pair of movable contacts.

Technical Field

The present disclosure relates to an electromagnetic relay, and more particularly, to an electromagnetic relay including a pair of fixed contacts and a pair of movable contacts.

Background

As a conventional example, an electromagnetic relay described in patent document 1 is exemplified. The electromagnetic relay described in patent document 1 includes an exciting coil, a bobbin around which the exciting coil is wound, an iron core inserted through the bobbin, a pair of fixed contacts, a movable spring, and an armature attached to the movable spring. The movable spring includes a movable portion. The movable portion has a pair of movable contacts. Before the exciting coil is energized, the armature is separated from the iron core, and the pair of movable contacts is separated from the pair of fixed contacts. Then, when the exciting coil is energized, the core is magnetized, and the armature is attracted toward the core. In response, the tip of the movable portion of the movable spring provided with the armature is displaced. Thereafter, the pair of movable contacts are brought into contact with the pair of fixed contacts, respectively.

In the electromagnetic relay described in patent document 1, there is a possibility that a deviation occurs between a timing at which one movable contact contacts one fixed contact and a timing at which the other movable contact contacts the other fixed contact.

Disclosure of Invention

In order to solve the above problem, an electromagnetic relay according to one aspect of the present disclosure includes a pair of fixed contacts, a movable contact portion, a cover portion, an electromagnet, and an armature. The movable contact portion has a displacement portion and a pair of movable contacts. The pair of movable contacts correspond one-to-one with the pair of fixed contacts. The displacement portion is connected to the pair of movable contacts so as to be electrically connected to the pair of movable contacts, and is displaceable integrally with the pair of movable contacts. The covering portion covers the displacement portion. The electromagnet has an excitation coil. The armature is attracted to the electromagnet by an electromagnetic force of the electromagnet, thereby driving the movable contact portions to make the pair of movable contacts respectively contact with or separate from the corresponding fixed contacts of the pair of fixed contacts. The armature has an adsorption site. The adsorption part is adsorbed to the electromagnet under the action of the electromagnetic force of the electromagnet. An opening is formed in the covering portion. The opening portion exposes a part of the displacement portion. The internal space of the opening intersects with a predetermined plane. The predetermined plane is orthogonal to the arrangement direction in which the pair of movable contacts are arranged. The predetermined plane passes through a center between both ends of the adsorption sites in the arrangement direction.

Drawings

Fig. 1 is a perspective view of an electromagnetic relay according to embodiment 1 with a cover removed.

Fig. 2 is an exploded perspective view of the electromagnetic relay.

Fig. 3 is a plan view of the electromagnetic relay with the cover removed.

Fig. 4 is a sectional view of a surface of the electromagnetic relay corresponding to the plane P1 of fig. 3.

Fig. 5 is a sectional view of a main portion showing a closed state of the electromagnetic relay.

Fig. 6 is a bottom view showing the armature, the core, and the movable contact portion of the electromagnetic relay.

Fig. 7 is a circuit diagram of a circuit using the electromagnetic relay described above.

Fig. 8 is a sectional view of a main portion of an electromagnetic relay according to embodiment 2.

Fig. 9 is a bottom view showing the armature and the 5 th yoke of the electromagnetic relay.

Detailed Description

Hereinafter, an electromagnetic relay according to an embodiment will be described with reference to the drawings. The embodiments described below are merely some of the 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.

(embodiment mode 1)

(Structure)

As shown in fig. 1 and 2, the electromagnetic relay 1 includes an electromagnet E1, an armature 3, a cover 8, a movable contact point portion 9, and a pair of fixed contacts F1, F2. The electromagnetic relay 1 further includes a movable spring 7.

The electromagnetic relay 1 of the present embodiment is a so-called hinge-type relay. The electromagnetic relay 1 is a device for switching between supply and interruption of dc power to a load (for example, an electrical component) from a power source such as a battery of an automobile. In the electromagnetic relay 1, the supply and interruption of dc power from the power supply to the load can be switched by driving the pair of movable contacts M1, M2 of the movable contact unit 9.

Specifically, the armature 3 is connected to the movable spring 7, the movable spring 7 is connected to the cover 8, and the cover 8 is connected to the movable contact portion 9. When the electromagnet E1 is excited, the armature 3 is attracted to the electromagnet E1 by the electromagnetic force of the electromagnet E1, and the armature 3, the base portion 73 of the movable spring 7, the cover portion 8, and the movable contact point portion 9 are displaced integrally. Thereby, the movable contact M1 of the movable contact portion 9 is driven to contact the fixed contact F1, and the movable contact M2 of the movable contact portion 9 is driven to contact the fixed contact F2. When the electromagnet E1 is demagnetized, the armature 3, the base portion 73 of the movable spring 7, the cover portion 8, and the movable contact point portion 9 are integrally displaced by the elastic force of the bent portion 72 of the movable spring 7, and return to the position before the electromagnet E1 is excited. Thereby, the movable contact M1 of the movable contact portion 9 is driven to separate from the fixed contact F1, and the movable contact M2 of the movable contact portion 9 is driven to separate from the fixed contact F2.

The 1 st direction D1, the 2 nd direction D2, and the 3 rd direction D3 in the following description are defined as follows. The 1 st direction D1 (arrangement direction) is a direction in which the pair of movable contacts M1 and M2 are arranged. The 3 rd direction D3 is a direction orthogonal to the 1 st direction D1, and is a direction along the direction in which the armature 3 is attracted to the electromagnet E1 to be displaced. The 2 nd direction D2 is a direction orthogonal to the 1 st direction D1 and the 3 rd direction D3.

The movable spring 7 includes a fixed portion 71, a bent portion 72, and a base portion 73. The fixing portion 71, the bent portion 72, and the base portion 73 are integrally formed of metal such as copper, for example. The movable spring 7 is a plate spring. The movable spring 7 is formed in a substantially L-shaped plate shape. More specifically, the bent portion 72 is formed in a substantially L-shaped plate shape, and the plate-shaped fixing portion 71 and the plate-shaped base portion 73 are connected to both ends of the bent portion 72.

As shown in fig. 2 and 3, the movable contact point unit 9 includes a displacement unit 90 and a pair of movable contacts M1 and M2. The displacement portion 90 has conductivity. The displacement section 90 includes a pair of displacement springs 91 and 92 and a coupling section 93. The pair of displacement springs 91 and 92 and the coupling portion 93 are integrally formed of a conductive material such as copper.

Displacement unit 90 is displaced integrally with a pair of movable contacts M1, M2 connected to displacement unit 90 so as to be electrically connected to displacement unit 90. The displacement portion 90 is formed in a substantially U-shaped flat plate shape in plan view. The pair of displacement springs 91 and 92 are formed in a rectangular shape. The coupling portion 93 is formed in a band shape. One end of both ends of the coupling portion 93 in the longitudinal direction is connected to the displacement spring 91, and the other end is connected to the displacement spring 92. The longitudinal direction of the coupling portion 93 is along the 1 st direction D1. The longitudinal directions of the pair of displacement springs 91 and 92 are along the 2 nd direction D2 orthogonal to the 1 st direction D1.

The pair of displacement springs 91, 92 are leaf springs. The displacement spring 91 corresponds to the movable contact M1, and the displacement spring 92 corresponds to the movable contact M2. The displacement spring 91 is connected to the movable contact M1 so as to be in electrical conduction with the movable contact M1, and the displacement spring 92 is connected to the movable contact M2 so as to be in electrical conduction with the movable contact M2. More specifically, a part of the movable contact M1 is inserted into and swaged in the insertion hole 911 formed in the displacement spring 91, and a part of the movable contact M2 is inserted into and swaged in the insertion hole 921 formed in the displacement spring 92. Thereby, the movable contact M1 is fixed to the displacement spring 91, and the movable contact M2 is fixed to the displacement spring 92.

As shown in fig. 3, the movable spring 7 is connected to the 1 st end of the covering 8 in the 2 nd direction D2, and the displacement portion 90 is connected to the 2 nd end of the covering 8 in the 2 nd direction D2. That is, the movable spring 7 is fixed to the movable contact portion 9 via the coating portion 8. The covering portion 8 is made of, for example, resin and has electrical insulation. The cover 8 electrically insulates the movable spring 7 from the movable contact portion 9. The covering portion 8 is formed in a substantially rectangular plate shape. The covering portion 8 is formed by, for example, integral molding with the movable spring 7 and the displacement portion 90. A part of the movable spring 7 and a part of the displacement portion 90 are covered by the covering portion 8. More specifically, a part of the movable spring 7 and a part of the displacement portion 90 are embedded in the covering portion 8.

The concave portion 81 is formed at the 2 nd end of the covering portion 8 in the 2 nd direction D2. The pair of displacement springs 91, 92 of the displacement portion 90 protrude from the covering portion 8 at a portion adjacent to the recessed portion 81 in the 1 st direction D1. Further, recesses 82 and 83 are formed at both ends of the covering 8 in the 1 st direction D1. At the recesses 82, 83, a part of the movable spring 7 and a part of the displacement portion 90 are exposed.

The cover 8 has a 1 st surface 801 and a 2 nd surface 802 (see fig. 4) on the side where the pair of fixed contacts F1, F2 (see fig. 4) and the electromagnet E1 (see fig. 4) are located. The 1 st surface 801 is a surface opposite to the 2 nd surface 802. The 1 st surface 801 has a recess 84 formed therein. The cladding 8 is recessed in the recess 84 along the 3 rd direction D3 (see fig. 4). That is, the covering 8 is recessed at the recessed portion 84 along the thickness direction of the covering 8.

The recess 84 is formed with a through hole 841. The through-hole 841 opens at the bottom 840 of the recess 84 and penetrates the covering 8 in the thickness direction. The through-hole 841 is formed in a circular shape.

In addition, an opening (window) 842 is formed in bottom surface 840. That is, the covering portion 8 is further recessed from the bottom surface 840 at the opening portion 842. A part (exposed part 94) of the coupling part 93 of the displacement part 90 is exposed to the outside of the covering part 8 at the opening 842. The exposed portion 94 includes a portion of the coupling portion 93 that is equidistant from both ends of the coupling portion 93 in the 1 st direction D1. The opening 842 is formed in a region of the covering 8 that is equidistant from both ends of the covering 8 in the 1 st direction D1. Here, "equal" does not include a concept that only two distances are completely equal. Two distances are considered to be "equal" as long as the difference between the two distances is within an allowable error range (for example, in the case where the shorter distance is 90% or more of the longer distance).

In the covering portion 8, an opening 842 is formed on the side opposite to the 2 nd surface 802 (see fig. 4). That is, the opening 842 is formed on the side opposite to the electromagnet E1 side (refer to fig. 4) in the direction (the direction along the 3 rd direction D3) in which the displacement portion 90 and the electromagnet E1 (refer to fig. 4) are aligned. The internal space of the opening 842 may extend to the 2 nd surface 802 of the covering 8 and penetrate the covering 8.

In addition, the coating portion 8 is formed with 4 circular recesses 851, 852, 853, 854 formed on the 1 st surface 801 and two circular through holes 861, 862. At the dimple 851, a part of the displacement spring 91 of the displacement portion 90 is exposed to the outside of the cover portion 8. At the dimple 852, a part of the displacement spring 92 is exposed to the outside of the cladding 8. At each of the dimples 853, 854, a part of the coupling portion 93 is exposed to the outside of the covering portion 8. At the two through holes 861, 862, a part of the base portion 73 of the movable spring 7 is exposed to the outside of the cover portion 8.

Part of the base 73 of the movable spring 7 is covered with the cover 8. The coupling portion 93 is covered with the covering portion 8 except for an exposed portion 94 and a region exposed to the outside of the covering portion 8 through the dimples 853, 854. The two displacement springs 91, 92 are each partially covered by the cover 8.

As shown in fig. 2 and 4, the electromagnet E1 includes the excitation coil 21, the core 23, and the 1 st yoke 24. In addition, the electromagnetic relay 1 further includes a bobbin 22, a pair of coil terminals 261, 262, a pair of main terminals 271, 272, a case 4, a stopper 5, and an arc extinguishing mechanism 6.

The bobbin 22 has a cylindrical portion 221 and a pair of flange portions 222, 223. The cylindrical portion 221 is formed in a cylindrical shape. The pair of flange portions 222, 223 are each formed in a substantially square frame shape. The pair of flanges 222 and 223 are connected to both ends of the cylindrical portion 221 in the axial direction. The bobbin 22 has a through hole 224 formed along the axial direction of the tube portion 221 inside the pair of flanges 222, 223 and the tube portion 221. The cylindrical portion 221 and the pair of flanges 222 and 223 have electrical insulation. The excitation coil 21 is wound around the cylindrical portion 221. The axial direction of the excitation coil 21 and the drum 221 is along the 3 rd direction D3. The distance between flange 222 and movable contact 9 is smaller than the distance between flange 223 and movable contact 9. A recess 225 is formed in the flange portion 222 in a region around the through-hole 224.

The core 23 has a shaft portion 231 and a head portion 232. The shaft portion 231 is formed in a columnar shape, more specifically, a columnar shape. The axial direction of the shaft 231 is along the 3 rd direction D3. The shaft 231 is inserted through the through hole 224 of the bobbin 22. The head 232 is formed in a disk shape. The head portion 232 is connected to one end of the shaft portion 231. The shaft portion 231 and the head portion 232 are integrally formed of a magnetic material.

The 1 st yoke 24 has a 1 st piece 241 and a 2 nd piece 242, and is formed in a substantially L-shaped plate shape. The 2 nd piece 242 extends from one end of the 1 st piece 241 in the thickness direction of the 1 st piece 241. The 1 st and 2 nd plates 241 and 242 are integrally formed of a magnetic material. The 2 nd piece 242 is fitted into the recess 226 formed in the flange 223 of the bobbin 22. The 2 nd piece 242 is arranged along the axial direction of the tube portion 221 of the bobbin 22. A through-hole 243 is formed in the 1 st sheet 241. A portion of the shaft 231 of the core 23 opposite to the head 232 is inserted into the through hole 243. The 1 st yoke 24 and the core 23 form a magnetic path through which magnetic flux generated when the exciting coil 21 is energized passes.

The fixing portion 71 of the movable spring 7 is fixed to the 2 nd piece 242 of the 1 st yoke 24. Thereby, the movable spring 7 is fixed to the 1 st yoke 24. More specifically, the two projections 244 formed on the 2 nd piece 242 are inserted into the two insertion holes 711 formed in the fixing portion 71, and the movable spring 7 is fixed to the 1 st yoke 24 by pressing the distal ends of the two projections 244. That is, the movable spring 7 is fixed to the 1 st yoke 24 by caulking.

The armature 3 is formed in a plate shape. The armature 3 includes a base end portion 31, an extension portion 32, and a projection portion 33. The base end portion 31, the extension portion 32, and the protrusion portion 33 are integrally formed of a magnetic material. The base end 31 is formed in a rectangular shape. The extension 32 extends from one side of the proximal end 31 substantially parallel to the proximal end 31. The extension portion 32 is formed in a trapezoidal shape having a width in the 1 st direction D1 (see fig. 6) that decreases as it moves away from the proximal end portion 31. The protrusion 33 protrudes from an end of the extension 32 opposite to the proximal end 31.

The armature 3 is fixed to the base 73 of the movable spring 7. More specifically, the two protrusions 311 formed on the base end portion 31 of the armature 3 are inserted into the two insertion holes 731 formed in the base portion 73, and the tip end portions of the two protrusions 311 are crushed, whereby the armature 3 is fixed to the base portion 73. That is, the armature 3 is fixed to the base 73 by caulking. The armature 3 is displaced integrally with the base 73, the cover 8, and the movable contact point 9. The directions in which the armature 3, the base 73, the cover 8, the displacement portion 90 of the movable contact portion 9, and the pair of movable contacts M1, M2 are displaced are along the 3 rd direction D3. One end of the armature 3 on the side close to the fixed portion 71 is in contact with the 2 nd piece 242 of the 1 st yoke 24. The armature 3 is supported by the 2 nd plate 242.

The 1 st surface 301 of the armature 3 opposed to the movable spring 7 is recessed at the extension portion 32 with respect to the base end portion 31. The 2 nd surface 302 of the armature 3 on the opposite side to the 1 st surface 301 is formed in a planar shape. The armature 3 further includes a boss portion 34 (see fig. 4) slightly protruding from the 2 nd surface 302.

The armature 3 is opposite the head 232 of the core 23 at the 2 nd surface 302 when the field coil 21 is not energized. The armature 3 is attracted to the head 232 at the 2 nd surface 302 by the electromagnetic force of the electromagnet E1 when the excitation coil 21 is energized.

The pair of coil terminals 261 and 262 are each formed of a conductive material such as copper. The pair of coil terminals 261 and 262 are each conductive. The pair of coil terminals 261 and 262 are each formed in a long plate shape. The 1 st end portion of the excitation coil 21 is wound around the coil terminal 261 and connected thereto by soldering or the like. The 2 nd end portion of the excitation coil 21 is wound around the coil terminal 262 and connected by soldering or the like. Magnetic flux is generated by supplying current to the exciting coil 21 through the pair of coil terminals 261 and 262.

The pair of main terminals 271 and 272 are each formed in a long plate shape from a conductive material such as copper, and have conductivity. The fixed contact F1 is fixed to the main terminal 271, and the fixed contact F2 is fixed to the main terminal 272. More specifically, a part of the fixed contact F1 is inserted into and crimped by the insertion hole 273 formed in the main terminal 271, and a part of the fixed contact F2 is inserted into and crimped by the insertion hole 274 formed in the main terminal 272. Thereby, the fixed contact F1 is electrically connected and fixed to the main terminal 271, and the fixed contact F2 is electrically connected and fixed to the main terminal 272.

The pair of fixed contacts F1 and F2 are aligned in the 1 st direction D1 (see fig. 1). The movable contact M1 corresponds to the fixed contact F1, and the movable contact M2 corresponds to the fixed contact F2. The movable contact M1 is provided at a position facing the fixed contact F1 in the 3 rd direction D3, and the movable contact M2 is provided at a position facing the fixed contact F2 in the 3 rd direction D3. The movable contact M1 is in contact with and separated from the fixed contact F1. The movable contact M2 is in contact with and separated from the fixed contact F2.

When the exciting coil 21 is not energized, as shown in fig. 1 and 4, the movable contact M2 is separated from the fixed contact F2, and the movable contact M2 and the fixed contact F2 are in a non-conductive state. At this time, the movable contact M1 is separated from the fixed contact F1, and the movable contact M1 and the fixed contact F1 are in a non-conductive state. When the excitation coil 21 is energized, the armature 3 is attracted to the head 232 of the core 23 by the electromagnetic force of the electromagnet E1, and the armature 3 is displaced integrally with the base 73, the cover 8, and the movable contact portion 9. As a result, as shown in fig. 5, the movable contact M2 comes into contact with the fixed contact F2, and the movable contact M2 and the fixed contact F2 are brought into a conductive state. The movable contact M1 (see fig. 1) is in contact with the fixed contact F1 (see fig. 1), and the movable contact M1 and the fixed contact F1 are in a conductive state. In addition, the armature 3 is attracted to the head 232 of the core 23.

The pair of movable contacts M1, M2 are electrically connected to each other via the displacement portion 90. A pair of main terminals 271 and 272 (see fig. 1) are electrically connected between the power source and the load. When at least one of the movable contact M2 and the fixed contact F2 and the movable contact M1 and the fixed contact F1 is in a non-conductive state, the pair of main terminals 271 and 272 are electrically disconnected from each other, and dc power is not supplied from the power supply to the load. The movable contact M2 is brought into contact with the fixed contact F2 to conduct, and the movable contact M1 is brought into contact with the fixed contact F1 to conduct, whereby conduction is established between the pair of main terminals 271 and 272, and dc power is supplied from the power supply to the load.

As shown in fig. 2, the housing 4 has a substantially square plate-like base 41 and a box-like cover 42. The base 41 and the cover 42 are made of, for example, resin, and have electrical insulation properties. An opening 420 (see fig. 4) is formed in one surface of the cover 42. The base 41 is attached to the cover 42 in a state of being inserted into the opening 420. The case 4 houses the electromagnet E1, the bobbin 22, the armature 3, the stopper 5, the movable spring 7, the cover 8, the movable contact point portion 9, and the pair of fixed contacts F1, F2.

The base 41 is formed with a through-hole 411 through which the main terminal 271 passes, a through-hole 412 through which the main terminal 272 passes, a through-hole 413 through which the coil terminal 261 passes, and a through-hole through which the coil terminal 262 passes. As shown in fig. 4, a recess 43 that opens to the outside of the housing 4 is formed in the base 41. In more detail, the recess 43 is formed in the base 41 at a position adjacent to the exciting coil 21 in the 2 nd direction D2. The electromagnetic relay 1 further includes a wall portion 44 protruding from the base 41. As shown in fig. 1, the wall portion 44 is formed between a pair of fixed contacts F1, F2 mounted on the pair of main terminals 271, 272, and separates the fixed contact F1 from the fixed contact F2. The wall portion 44 is formed between the pair of movable contacts M1, M2, and separates the movable contact M1 from the movable contact M2.

As shown in fig. 2 and 5, the stopper 5 includes a base 51, an extended portion 52, and a stopper 53. The base 51, the extension portion 52, and the stopper 53 are integrally formed of a non-magnetic metal such as copper, for example. The stopper 53 limits the displacement of the armature 3.

The base 51 is formed in a plate shape. The base 51 is fixed to the bobbin 22. The base 51 is formed with a through hole 510 through which the shaft 231 of the core 23 passes. The base 51 is fitted into the recess 225 formed in the flange 222 of the bobbin 22, and the base 51 is fixed to the bobbin 22 while being sandwiched between the head 232 of the core 23 and the bobbin 23 in a state where the shaft 231 of the core 23 is inserted through the through hole 510.

The extension portion 52 is formed in a plate shape. The extension portion 52 extends from the base portion 51 along the thickness direction of the base portion 51.

The stopper 53 is formed in a plate shape. The stopper 53 protrudes from the distal end of the extended portion 52 along the thickness direction of the extended portion 52. That is, the stopper 53 is provided substantially in parallel with the base 51. The stopper 53 has elasticity. A part of the wall portion 44 is adjacent to the stopper 53 at a side opposite to the side where the armature 3 is located when viewed from the stopper 53.

As shown in fig. 2 and 4, the arc extinguishing mechanism 6 includes a permanent magnet 61 and a 2 nd yoke 62.

When the energization of the exciting coil 21 is interrupted and the movable contact M1 is separated from the fixed contact F1 and the movable contact M2 is separated from the fixed contact F2, an arc may be generated between the movable contact M1 and the fixed contact F1 and between the movable contact M2 and the fixed contact F2. The arc generated between the movable contact M1 and the fixed contact F1 and the arc generated between the movable contact M2 and the fixed contact F2 can be pulled to the outside of the electromagnetic relay 1 by the permanent magnet 61 and the 2 nd yoke 62.

The permanent magnet 61 is formed in a rectangular parallelepiped shape. The permanent magnet 61 is accommodated in the recess 43 of the base 41. The permanent magnet 61 is adjacent to a pair of fixed contacts F1, F2 in the 3 rd direction D3. The permanent magnet 61 is disposed between the excitation coil 21 and the 2 nd yoke 62 in the 2 nd direction D2. The permanent magnet 61 is, for example, a ferrite magnet. The permanent magnet 61 is disposed such that the 2 nd yoke 62 side becomes the N-pole and the exciting coil 21 side becomes the S-pole, for example.

The 2 nd yoke 62 is formed in a substantially square plate shape. The 2 nd yoke 62 is formed of a magnetic material such as an iron-based material (e.g., galvanized steel sheet). The 2 nd yoke 62 is attracted to the permanent magnet 61 by magnetic force. A through hole 621 through which the main terminal 271 passes and a through hole 622 through which the main terminal 272 passes are formed in the 2 nd yoke 62.

The 2 nd yoke 62 includes an adjacent portion 63 adjacent to the fixed contact F1 and the movable contact M1 in the 2 nd direction D2 and an adjacent portion 64 adjacent to the fixed contact F2 and the movable contact M2 in the 2 nd direction D2. The pair of adjacent portions 63, 64 are connected to each other, and a gap 65 is formed between the pair of adjacent portions 63, 64.

The 2 nd yoke 62 has a plurality of (4 in fig. 2) projections 623 projecting from the pair of adjacent portions 63, 64. The permanent magnets 61 are positioned between the plurality of protrusions 623.

Fig. 6 shows only the armature 3, the core 23, and the movable contact portion 9 in the structure of the electromagnetic relay 1, and shows a state in which the armature 3 is attracted to the core 23. As shown in fig. 5 and 6, the armature 3 has an attraction portion AD1 attracted to the head portion 232 of the core 23 of the electromagnet E1. The adsorption site AD1 is a circular site of the armature 3 that overlaps the head 232 in the 3 rd direction D3 when adsorbed on the head 232. In fig. 6, the area occupied by the adsorption site AD1 is a virtual area. The adsorption site AD1 is located in the extension 32 of the armature 3. The adsorption site AD1 is opposed to the head 232. Both ends (ends T1, T2) of the adsorption sites AD1 in the 1 st direction D1 (arrangement direction) are arranged along the 1 st direction D1. Here, the ends T1 and T2 are virtual points, respectively. The ends T1, T2 are two points of the adsorption site AD1 located on opposite sides (upper and lower sides of the sheet of fig. 6) in the 1 st direction D1 and located on the outermost side of the adsorption site AD1 in the 1 st direction D1.

When the armature 3 is attracted to the head portion 232, the peripheral edge of the head portion 232 overlaps the peripheral edge of the attraction site AD1 in the 3 rd direction D3. At this time, the center C1 between the ends T1 and T2 overlaps the center of the head 232 in the 3 rd direction D3. At this time, the center C1 is located on an extension of the central axis X1 of the shaft portion 231 of the core 23. At this time, the through hole 841 of the covering portion 8 is located on an extension of the central axis X1 of the shaft portion 231. At this time, the exposed portion 94 overlaps the core 23 in the 3 rd direction D3 with the covering portion 8 and the armature 3 interposed therebetween and the core 23. More specifically, the exposed portion 94 overlaps the shaft portion 231 of the core 23 in the 3 rd direction D3 with the cover portion 8 and the armature 3 interposed therebetween and the core 23.

As shown in fig. 3 to 6, a plane P1 (predetermined plane) perpendicular to the 1 st direction D1 (arrangement direction) and passing through the center C1 intersects the internal space of the opening 842. In addition, the plane P1 intersects the exposed portion 94. The plane P1 intersects the inner space of the through-hole 841. In addition, the plane P1 intersects the stopper 53. The plane P1 is along the 2 nd direction D2 and the 3 rd direction D3. The core 23, the armature 3, the movable spring 7, the cover 8, and the movable contact portion 9 are formed in a plane-symmetric shape with respect to the plane P1.

A midpoint C23 between centers C2 and C3 of the pair of movable contacts M1 and M2 is located on the plane P1. The center C2 is the center of the surface M10 of the movable contact M1 when the movable contact M1 is viewed from the fixed contact F1 side. The center C3 is the center of the surface M20 of the movable contact M2 when the movable contact M2 is viewed from the fixed contact F2 side.

When the centers C1 of the exposed portion 94 and the suction portion AD1 are projected in the 3 rd direction D3, the exposed portion 94 and the center C1 are aligned in the 2 nd direction D2 (see fig. 3 and 6). In summary, the exposed portion 94 and the center C1 overlap the plane P1 when viewed from the 3 rd direction D3.

(action)

Next, the operation of the electromagnetic relay 1 according to the present embodiment will be described with reference to fig. 4 and 5.

First, when the excitation coil 21 is not energized, the armature 3 is separated from the core 23 and brought into contact with the stopper 53 by the elastic action of the movable spring 7 fixed to the armature 3, as shown in fig. 4. More specifically, the stopper 53 contacts the armature 3 from the side opposite to the electromagnet E1 side in the direction in which the attraction point AD1 (refer to fig. 5) and the electromagnet E1 are aligned (the direction along the 3 rd direction D3). More specifically, the stopper 53 contacts the armature 3 at an end of the stopper 53 opposite to the extended portion 52 (i.e., a base end side of the stopper 53), that is, at a tip end side. At this time, the movable contact M2 is separated from the fixed contact F2, and the movable contact M1 (see fig. 1) is separated from the fixed contact F1 (see fig. 1).

When the exciting coil 21 is energized, the core 23 is magnetized, and the armature 3 is attracted toward the head 232 of the core 23 by the electromagnetic force of the electromagnet E1, and the armature 3 separates from the stopper 53. That is, the armature 3 is displaced so as to be close to the core 23. Accordingly, the movable spring 7 is elastically deformed at the bent portion 72, and the base portion 73 of the movable spring 7 is displaced so as to approach the core 23. Thereby, the cover portion 8 and the movable contact portion 9 are also displaced so as to approach the core 23. Thereafter, as shown in fig. 5, the movable contact M2 contacts the fixed contact F2, the movable contact M1 (see fig. 1) contacts the fixed contact F1 (see fig. 1), and the armature 3 is attracted to the head 232 of the core 23. As a result, the movable contact M2 and the fixed contact F2 are electrically connected, and the movable contact M1 and the fixed contact F1 are electrically connected.

That is, the armature 3 is attracted to the electromagnet E1 by the electromagnetic force of the electromagnet E1 to drive the movable spring 7, and the movable spring 7 is driven to displace the cover portion 8 and the movable contact point portion 9. Thus, the armature 3 indirectly drives the movable contact portion 9. In the movable contact point unit 9, the displacement unit 90 is displaced integrally with the pair of movable contacts M1, M2 connected to the displacement unit 90.

When the energization of the exciting coil 21 is cut off, the core 23 is demagnetized, the movable spring 7 is elastically deformed at the bent portion 72, and the base portion 73 of the movable spring 7 is displaced so as to be separated from the core 23. Accordingly, since the armature 3 is separated from the head 232 of the core 23 and the cover 8 and the movable contact point 9 are displaced so as to be separated from the core 23, the movable contact point M1 is separated from the fixed contact point F1 and the movable contact point M2 is separated from the fixed contact point F2. As a result, the movable contact M1 and the fixed contact F1 are electrically disconnected from each other, and the movable contact M2 and the fixed contact F2 are electrically disconnected from each other. After that, the armature 3 comes into contact with the stopper 53. When the armature 3 contacts the stopper 53, the impact of the collision between the stopper 53 and the armature 3 is mitigated by the elasticity of the stopper 53.

In the middle of energization of the exciting coil 21 and attraction of the armature 3 to the head 232 of the core 23, a gap exists between the armature 3 and the head 232 at the moment when the movable contact M1 contacts the fixed contact F1 and at the moment when the movable contact M2 contacts the fixed contact F2. Then, the pair of displacement springs 91 and 92 (see fig. 1) elastically deform so as to flex with the pair of movable contacts M1 and M2 as fulcrums, and the armature 3 further approaches the head 232, and the armature 3 is attracted to the head 232. When the energization of the exciting coil 21 is interrupted and the armature 3 is separated from the head 232, the pair of displacement springs 91 and 92 are elastically restored to their original shapes.

(method of detecting simultaneity of contacts)

Next, an example of a method of detecting the simultaneity of the contacts will be described. Here, the detection of the simultaneity of the contacts means to detect whether or not the timing at which the movable contact M1 contacts the fixed contact F1 coincides with the timing at which the movable contact M2 contacts the fixed contact F2, or the degree of deviation. The simultaneous detection of the contacts is performed, for example, in the manufacturing process of the electromagnetic relay 1. In the present embodiment, in order to detect the simultaneity of the contacts, a detection circuit 100 shown in fig. 7, a processing device 13 configured by a PLC (programmable Logic controller) or the like, and a control device 14 configured by a PLC or the like are used in addition to the electromagnetic relay 1.

The detection circuit 100 includes 4 power supply units V1 to V4, a probe 10, 4 resistors R1 to R4, and a pair of photocouplers 11 and 12.

The main terminal 271 of the electromagnetic relay 1 is connected to the power supply V1 via a series circuit of a light emitting portion 111 (for example, a light emitting diode) of the photocoupler 11 and a resistor R1. The light receiving portion 112 (e.g., phototransistor) of the photocoupler 11 is connected to the processing device 13. The light receiving unit 112 is connected to the power supply unit V2 via a resistor R2. A voltage is applied from the power supply unit V2 to the processing device 13 via the resistor R2.

Similarly, the main terminal 272 of the electromagnetic relay 1 is connected to the power supply unit V3 via a series circuit of the light emitting unit 121 (e.g., a light emitting diode) of the photocoupler 12 and the resistor R3. The light receiving portion 122 (e.g., a phototransistor) of the photocoupler 12 is connected to the processing device 13. The light receiving unit 122 is connected to the power supply unit V4 via a resistor R4. A voltage is applied from the power supply unit V4 to the processing device 13 via the resistor R4.

The probe 10 is a member for driving the movable contact portion 9. The probe 10 is formed in a cylindrical shape, for example. The diameter of the probe 10 is, for example, 0.5 mm. The probe 10 has conductivity. The probe 10 is grounded. The probe 10 is pressed against the exposed portion 94 of the movable contact portion 9 by computer control by the control device 14 and displaced toward the core 23. Further, the control device 14 measures the displacement amount of the probe 10 after the probe 10 is pressed against the exposure portion 94 based on information on the control content of the probe 10 by the control device 14, and outputs the measured displacement amount to the processing device 13.

The simultaneous detection of the respective contacts is performed in a state where no voltage is applied to the pair of coil terminals 261 and 262. That is, the simultaneous detection of the respective contact points is performed in a state where the attraction force is not applied between the core 23 of the electromagnet E1 and the armature 3. The simultaneous detection of the contacts is started in a state where the movable contact M1 is separated from the fixed contact F1 and the movable contact M2 is separated from the fixed contact F2. The simultaneous detection of the contacts is performed in a state where the cover 42 of the electromagnetic relay 1 is not attached.

In this state, the probe 10 is pressed against the exposed portion 94 of the movable contact portion 9 through the opening 842 of the covering portion 8 by the control of the control device 14. Thereby, the probe 10 is electrically connected to the movable contact portion 9.

The probe 10 presses the movable contact point portion 9 toward the core 23 of the electromagnet E1 at the exposed portion 94, so that the movable spring 7 is elastically deformed at the bent portion 72, and the movable contact point portion 9, the covering portion 8, the base portion 73 of the movable spring 7, and the armature 3 are displaced so as to approach the core 23. As a result, the movable contact M1 comes into contact with the fixed contact F1. Further, the movable contact M2 is in contact with the fixed contact F2. Here, the following case is explained: when the movable contact point portion 9 is further pressed toward the side of the core 23 by the probe 10 after the movable contact point M1 comes into contact with the fixed contact point F1, the movable contact point M2 comes into contact with the fixed contact point F2.

When the movable contact M1 comes into contact with the fixed contact F1 and becomes conductive, the power supply unit V1 passes through the probe 10 to the ground point of the probe 10 and becomes conductive. Therefore, since a current flows through the light emitting portion 111 of the photocoupler 11, a current flows between the collector and the emitter of the light receiving portion 112, and the voltage applied to the processing device 13 is reduced to substantially 0V. As a result, the processing device 13 can detect that the movable contact M1 is in contact with the fixed contact F1.

Similarly, when the movable contact M2 comes into contact with the fixed contact F2 and becomes conductive, the power supply unit V3 is conducted to the ground point via the probe 10. Therefore, since a current flows through the light emitting portion 121 of the photocoupler 12, a current flows between the collector and the emitter of the light receiving portion 122, and the voltage applied to the processing device 13 is reduced to substantially 0V. As a result, the processing device 13 can detect that the movable contact M2 is in contact with the fixed contact F2.

The processing device 13 detects the displacement amount of the probe 10 from the detection of the contact of the movable contact M1 with the fixed contact F1 to the detection of the contact of the movable contact M2 with the fixed contact F2 based on the output of the control device 14.

In the case where the movable contact M1 comes into contact with the fixed contact F1 after the movable contact M2 comes into contact with the fixed contact F2, the method of detecting the simultaneity of the contacts is the same as described above. That is, the processing device 13 can detect the displacement amount of the probe 10 from the detection of the contact of the movable contact M2 with the fixed contact F2 to the detection of the contact of the movable contact M1 with the fixed contact F1 based on the output of the control device 14.

That is, the detection circuit 100, the processing device 13, and the control device 14 can detect the deviation between the time when the movable contact M1 makes contact with the fixed contact F1 and the time when the movable contact M2 makes contact with the fixed contact F2 as the displacement amount of the probe 10.

In addition, the operator may change the distance between the movable contact M1 and the fixed contact F1 and the distance between the movable contact M2 and the fixed contact F2 by bending at least one of the pair of displacement springs 91 and 92 in accordance with the detected displacement amount of the probe 10. This makes it possible to correct (reduce) the deviation between the timing at which the movable contact M1 contacts the fixed contact F1 and the timing at which the movable contact M2 contacts the fixed contact F2. The work of correcting the deviation may be performed not manually but by computer control.

When the timing at which the movable contact M1 contacts the fixed contact F1 and the timing at which the movable contact M2 contacts the fixed contact F2 substantially coincide with each other, the displacement amount of the probe 10 is detected to be substantially zero.

When an electric circuit from the fixed contact F1 to the fixed contact F2 via the movable contact M1, the displacement portion 90, and the movable contact M2 is closed, an arc may be generated. When there is a deviation between the timing at which the movable contact M1 contacts the fixed contact F1 and the timing at which the movable contact M2 contacts the fixed contact F2, the operation of finally closing the above-described electric circuit is performed at the movable contact and the fixed contact which contact each other thereafter. Therefore, the load due to the arc when the circuit is closed may be greater at the movable contact and the fixed contact that come into contact with each other later than at the movable contact and the fixed contact that come into contact with each other earlier. By performing the above-described operation of correcting the deviation, the deviation between the timing at which the movable contact M1 contacts the fixed contact F1 and the timing at which the movable contact M2 contacts the fixed contact F2 is reduced, and the possibility of a load being intensively applied to one movable contact and one fixed contact can be reduced. This can suppress a decrease in contact performance of the pair of movable contacts M1, M2 and the pair of fixed contacts F1, F2.

If the simultaneity of the contacts is detected and the deviation between the timing at which the movable contact M1 contacts the fixed contact F1 and the timing at which the movable contact M2 contacts the fixed contact F2 is corrected in the manufacturing process of the electromagnetic relay 1, the electromagnetic relay 1 in which the deviation is reduced can be manufactured.

In the electromagnetic relay 1, the probe 10 can be inserted into the through hole 841 of the cover 8, and the probe 10 is pressed against the armature 3 by applying a predetermined load to the probe 10 under the control of the control device 14, thereby displacing the probe 10 and the armature 3. Thus, the controller 14 can measure the relationship between the displacement amount of the probe 10 (i.e., the displacement amount of the armature 3) and the load applied to the probe 10. The measurement is preferably performed before the step of detecting the simultaneity of the respective contacts. Further, the spring load of the movable spring 7 may be adjusted (changed) based on the result of measuring the relationship between the displacement amount of the armature 3 and the load applied to the probe 10. In the measurement of the relationship between the displacement amount of the armature 3 and the load applied to the probe 10, the armature 3 may be displaced by pressing the armature 3 with a member having no electrical conductivity, instead of using a member having electrical conductivity, such as the probe 10.

The main body of the processing device 13, the control device 14, and the method for detecting the simultaneity of each contact according to the present disclosure includes a computer system. The computer system has 1 or more computers. The computer system has a main structure of a processor and a memory as hardware. The processor executes the program stored in the memory of the computer system, thereby realizing the functions as the main execution body of the processing device 13, the control device 14, and the method for detecting the simultaneity of each contact according to the present disclosure. The program may be stored in advance in a memory of the computer system, but may be provided through a telecommunication line, or may be stored in a non-transitory storage medium such as a memory card, an optical disk, and a hard disk drive (magnetic disk) that can be read by the computer system. A processor of a computer system is constituted by 1 to a plurality of electronic circuits including a semiconductor Integrated Circuit (IC) or a large scale integrated circuit (LSI). The plurality of electronic circuits may be integrated in 1 chip or may be provided in a plurality of chips in a dispersed manner. The plurality of chips may be integrated in 1 device, or may be provided in a plurality of devices in a distributed manner.

(Effect)

Conventionally, in an electromagnetic relay including a pair of fixed contacts and a pair of movable contacts, there is a possibility that a deviation occurs between a timing at which one movable contact comes into contact with one fixed contact and a timing at which the other movable contact comes into contact with the other fixed contact. Therefore, it is desired to develop an electromagnetic relay having a structure for detecting the presence or absence of the deviation. An object of the present disclosure is to provide an electromagnetic relay having a configuration for detecting whether or not there is a deviation between a timing at which a movable contact is brought into contact with a fixed contact and a timing at which another movable contact is brought into contact with another fixed contact, or whether or not there is a deviation between a timing at which a movable contact is separated from a fixed contact and a timing at which another movable contact is separated from another fixed contact.

In the present embodiment, the internal space of the opening 842 to which the exposing portion 94 is exposed intersects with a plane P1 orthogonal to the 1 st direction D1, and the plane P1 passes through a center C1 (see fig. 5 and 6) between both ends (ends T1 and T2) of the adsorption site AD1 in the 1 st direction D1. Thus, the probe 10 can apply an action in the direction of the 3 rd direction D3 to the movable contact point part 9 toward a part adjacent to the center C1 in the 2 nd direction D2 among the adsorption parts AD1 by pressing the movable contact point part 9 at the exposed part 94. On the other hand, when the exciting coil 21 is energized (i.e., the electromagnet E1 is excited) and the armature 3 is attracted toward the electromagnet E1, action in the direction of the 3 rd direction D3 is applied to the armature 3, whereby the movable contact point portion 9 is displaced in the direction along the 3 rd direction D3. Therefore, the case of displacement of the movable contact point portion 9 when the probe 10 presses the movable contact point portion 9 at the exposed portion 94 can be the same as the case of displacement of the movable contact point portion 9 when the exciting coil 21 is energized. Therefore, as compared with the case where the internal space of the opening 842 does not intersect the plane P1, the processing device 13 can detect the deviation between the timing at which the movable contact M1 contacts the fixed contact F1 and the timing at which the movable contact M2 contacts the fixed contact F2 with higher accuracy.

When the armature 3 is attracted to the core 23, the exposed portion 94 overlaps the core 23 in the 3 rd direction D3 with the cover 8 and the armature 3 interposed therebetween and the core 23. Therefore, the displacement of the movable contact portion 9 when the probe 10 is pressed against the exposed portion 94 is more likely to be similar to the displacement of the movable contact portion 9 when the exciting coil 21 is energized. Therefore, it is possible to further accurately detect, by the processing device 13, a deviation between the timing at which the movable contact M1 contacts the fixed contact F1 and the timing at which the movable contact M2 contacts the fixed contact F2.

(modification of embodiment 1)

Next, a modification of embodiment 1 will be described. The following modifications can also be realized by appropriate combinations.

In the electromagnetic relay 1 according to embodiment 1, the movable contact M1 is fixed to the displacement spring 91, and the movable contact M2 is fixed to the displacement spring 92. In contrast, the displacement spring 91 and the movable contact M1 may be integrally formed. Further, the displacement spring 92 and the movable contact point M2 may be formed integrally.

In the electromagnetic relay 1 according to embodiment 1, the fixed contact F1 is fixed to the main terminal 271, and the fixed contact F2 is fixed to the main terminal 272. In contrast, the main terminal 271 and the fixed contact F1 may be integrally formed. In addition, the main terminal 272 and the fixed contact F2 may be integrally formed.