CN212517054U - Electromagnet device, contact device, and electromagnetic relay device - Google Patents

Abstract

The utility model provides an electromagnet device, contact device and electromagnetic relay device. The electromagnet device is provided with: a coil wound around the hollow bobbin and generating magnetic flux when energized; a shaft made of a non-magnetic material and provided in the hollow space of the bobbin; a movable member provided in the hollow space of the bobbin and having a movable member shaft insertion hole through which the shaft is inserted; and a plunger cap formed of a non-magnetic material, disposed in the hollow space of the bobbin, and surrounding the movable member, wherein the shaft is inserted into the shaft insertion hole of the movable member and coupled to the movable member so as to be movable integrally in the axial direction of the shaft, the movable member reciprocates in the axial direction in response to the power-on/off of the coil, the movable member has a two-layer structure, a first layer is formed of a non-magnetic material, includes a surface of the movable member and has a predetermined thickness, and a second layer is formed of a magnetic material and is located inside the first layer. The utility model discloses can alleviate the wearing and tearing of movable member and prolong the life of device.

Description

Electromagnet device, contact device, and electromagnetic relay device

Technical Field

The utility model relates to an electromagnetic relay device field especially relates to an electromagnet device, possess this electromagnet device's contact device and electromagnetic relay device.

Background

Conventionally, a contact device is known which includes a contact module having fixed contacts and movable contacts that can be brought into contact with and separated from the fixed contacts, and a drive module that brings the movable contacts into contact with and separated from the fixed contacts (patent document 1: japanese patent application No. 2016 165668).

In patent document 1, as shown in fig. 1 (fig. 2 of patent document 1), a drive module 20 of a contact device includes: a coil part 210 having a coil 230 and a hollow cylindrical bobbin 220 around which the coil 230 is wound; a yoke part 240 made of a magnetic material, surrounding the bobbin 220, and including a yoke upper plate 241 disposed on the upper end surface side of the bobbin 220, and a yoke 242 disposed on the lower end surface side and the side surface side of the bobbin 220; and a spacer 250 made of a magnetic material, attached to a circular insertion hole 242c formed in the bottom wall 242a of the yoke 242, and disposed in the cylinder of the bobbin 220, the spacer 250 forming a magnetic path of the magnetic field generated by the coil 230 together with the yoke 240 (the yoke upper plate 241 and the yoke 242), the fixed core 260, and the movable core 270, thereby enhancing the attraction force generated by the coil part 210. The fixed core 260 and the movable core 270 are nickel-plated to form a nickel plating layer on the surfaces thereof, and the fixed core 260 and the movable core 270 are disposed in the cylinder of the bushing 250 via a plunger cap 290 made of a non-magnetic material.

In the drive module 20 of the conventional contact device, the movable core 270 repeatedly moves as the coil 230 is turned on and off, and the movable core 270 wears out as the number of times of the repeated movement increases. The wear of the movable core 270 is closely related to the life of the drive module 20 and the entire contact device including the drive module 20, and when the movable core 270 is worn to a certain extent, the drive module 20 cannot be normally driven, and the contact device cannot be normally used.

Documents of the prior art

Patent document

Patent document 1: japanese patent application 2016-165668

SUMMERY OF THE UTILITY MODEL

Technical problem

In view of the above, an object of the present invention is to provide an electromagnet device, a contact device and an electromagnetic relay device having the electromagnet device, which can reduce wear of a movable core and prolong the service life of the device.

Solution scheme

In order to solve the above technical problem, according to the utility model discloses an embodiment provides an electromagnet device, its characterized in that possesses: a coil wound around the hollow bobbin and generating magnetic flux when energized; a shaft made of a non-magnetic material and provided in the hollow space of the bobbin; a movable member provided in the hollow space of the bobbin, the movable member being provided with a movable member shaft insertion hole through which the shaft is inserted; and a plunger cap made of a non-magnetic material, provided in the hollow space of the bobbin, and surrounding the movable member, wherein the shaft is inserted into the movable member shaft insertion hole and is connected to the movable member so as to be movable integrally in an axial direction of the shaft, the movable member reciprocates in the axial direction in accordance with the on/off state of the coil, the movable member has a two-layer structure, a first layer is made of a non-magnetic material, has a predetermined thickness, includes a surface of the movable member, and a second layer is made of a magnetic material and is located inside the first layer.

In one possible implementation, the electromagnet device further includes a fixed member made of a magnetic material, the fixed member being provided in the plunger cap at a position closer to an opening of the plunger cap than the movable member, and a fixed member shaft insertion hole through which the shaft is inserted being provided in the fixed member coaxially with the movable member shaft insertion hole.

In one possible implementation, the first layer is formed of a silver plating layer having a thickness of 3 μm to 9 μm, and the plunger cap is formed of SUS304 as stainless steel.

In one possible implementation, the movable member further includes a third layer, which is located between the first layer and the second layer and is made of a non-magnetic body different from the first layer.

In one possible implementation, the first layer is formed of a silver plating layer having a thickness of 3 μm to 9 μm, the third layer is formed of a copper plating layer, and the plunger cap is formed of SUS304 which is stainless steel.

In one possible implementation, the movable member shaft insertion hole includes: the electromagnet device is characterized in that a first insertion through hole is formed in one end close to an opening of the plunger cap, a second insertion through hole is formed in one end close to the bottom of the plunger cap and is coaxial with the first insertion through hole, a third insertion through hole is formed in the other end close to the bottom of the plunger cap and is communicated with the first insertion through hole and the second insertion through hole and is coaxial with the first insertion through hole, the aperture of the first insertion through hole is larger than that of the third insertion through hole, the aperture of the third insertion through hole is larger than that of the second insertion through hole, the electromagnet device is further provided with a spring, the spring is arranged in the first insertion through hole and the second insertion through hole in a mode of surrounding the shaft, and the extension direction of the spring is the axial direction of the shaft.

In one possible implementation, the outer side surface of the movable member is composed of a curved surface and a flat surface.

In one possible implementation, the electromagnet device further includes an upper yoke plate that covers the coil, the movable member, and the plunger cap from an opening direction of the plunger cap, the upper yoke plate is provided with an upper yoke plate shaft insertion hole that is coaxial with the movable member shaft insertion hole and through which the shaft is inserted, and a hole diameter of the upper yoke plate shaft insertion hole is set to be larger than a minimum hole diameter of the movable member shaft insertion hole by a maximum allowable gap between the movable member and the plunger cap.

In order to solve the above technical problem, according to another embodiment of the present invention, there is provided a contact device, including: any one of the electromagnet arrangements described above; a fixed contact; and a movable contact provided opposite to the fixed contact, the movable contact being driven by the electromagnet device to come into contact with or separate from the fixed contact in accordance with the movement of the shaft in the axial direction.

In order to solve the above technical problem, according to another embodiment of the present invention, there is provided an electromagnetic relay device, including the contact device described above.

Advantageous effects

According to the present invention, there are provided an electromagnet device, a contact device provided with the electromagnet device, and an electromagnetic relay device, in which the life of the device can be prolonged by reducing the wear of a movable iron core.

Other features and aspects of the present invention will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present invention and, together with the description, serve to explain the principles of the invention.

Fig. 1 is a vertical sectional view for explaining the structure of a conventional contact device.

Fig. 2 is a longitudinal sectional view schematically showing the structure of a contact device according to an embodiment of the present invention.

Fig. 3 is an exploded perspective view schematically showing a structure inside a bobbin of the contact device shown in fig. 2.

Fig. 4 is a longitudinal sectional view schematically showing a structure in a bobbin of the contact device shown in fig. 2.

Fig. 5 is a perspective view schematically showing the structure of the movable iron core of the contact device shown in fig. 2.

Fig. 6 is a longitudinal sectional view schematically showing the structure of the movable iron core of the contact device shown in fig. 2.

Fig. 7 is a longitudinal sectional view schematically showing the structure of a contact device according to another embodiment of the present invention.

Fig. 8 is an exploded perspective view schematically showing a structure inside a bobbin of the contact device shown in fig. 7.

Fig. 9 is a longitudinal sectional view schematically showing a structure in a bobbin of the contact device shown in fig. 7.

Fig. 10 is a perspective view schematically showing a modification of the movable core according to the present invention.

Detailed Description

Various exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present invention.

Hereinafter, the vertical and horizontal directions in fig. 2 and 7 are referred to as vertical and horizontal directions, and the direction perpendicular to the paper surface in fig. 2 and 7 is referred to as a front-rear direction.

Example 1

A contact device 1 according to embodiment 1 of the present invention will be described with reference to fig. 2 to 6.

[ CONTACT DEVICE 1 ]

The contact device 1 includes a drive module (electromagnet device) 2 located at a lower portion and a contact module 3 located at an upper portion, and the contact device 1 is housed in a case 10 formed into a hollow box shape by a resin material. Next, the drive module 2 and the contact module 3 will be described.

[ Driving Module 2 ]

The driving module 2 drives the movable contacts 31 of the contact module 3 to contact and separate from the fixed contacts 32, thereby opening and closing the contacts.

The drive module 2 includes a coil portion 21, a yoke module 22, a movable iron core (movable member) 23, a shaft 24, a return spring 25 wound around the shaft 24, and a plunger cap 26.

The coil section 21 includes: a coil 211 that generates a magnetic flux by energization; and a hollow cylindrical bobbin 212 around which the coil 211 is wound.

The bobbin 212 is formed of resin as an insulating material, and an insertion hole (hollow space) 212a penetrating in the vertical direction is formed in the central portion of the bobbin 212. The bobbin 212 includes: a winding body 212b that is continuous in the vertical direction and on the outer surface of which the coil 211 is wound; a lower flange portion 212c provided continuously with the lower end of the wound body portion 212b and projecting radially outward of the wound body portion 212 b; an upper flange portion 212d provided continuously with the upper end of the wound body portion 212b and protruding radially outward of the wound body portion 212 b.

The movable iron core 23 is inserted into the insertion hole 212a of the bobbin 212 and is housed by a plunger cap 26 described later in detail. The movable iron core 23 includes a cylindrical portion (second layer) 231 formed of a magnetic material as a main body portion, and the cylindrical portion 231 includes a lower insertion hole (second insertion hole) for inserting and fixing the shaft 24 at a lower side in the movable iron core 23 and an upper insertion hole 232 (see fig. 4 and 6) for inserting the shaft 24 and the return spring 25 coaxially with the lower insertion hole at an upper portion in the movable iron core 23.

The upper insertion hole 232 includes a large diameter insertion hole 232a (first insertion hole) located at the upper portion and a small diameter insertion hole 232b (third insertion hole) located between and communicating the large diameter insertion hole 232a and the lower insertion hole. The diameter of the large diameter insertion hole 232a is larger than that of the small diameter insertion hole 232b, the diameter of the small diameter insertion hole 232b is larger than that of the lower insertion hole, and the diameter of the small diameter insertion hole 232b is substantially equal to or slightly smaller than the outer diameter of the return spring 25.

A cut surface 233 is formed on the outer surface of the cylindrical portion 231 of the movable iron core 23 at a position symmetrical about the central axis of the cylindrical portion 231, and the cut surface 233 extends in the vertical direction from the lower surface 234 to the upper surface 235 of the movable iron core 23. That is, the outer side surface of the movable iron core 23 is constituted by a flat surface and a curved surface.

A plating layer (first layer) 236 of a non-magnetic material, for example, a silver (Ag) plating layer, is formed on the surface (including the inner surface, the outer surface, and the upper and lower surfaces) of the movable iron core 23, and the thickness of the plating layer 236 is, for example, 6 μm.

The shaft 24 is formed of a nonmagnetic material, and includes: a shaft body 24a of a round bar shape that is long in the moving direction (vertical direction: axial direction) of the movable iron core 23; and a substantially disc-shaped flange portion 24b projecting radially outward from the upper end of the shaft body portion 24 a.

The shaft body portion 24a is inserted into an upper insertion hole and a lower insertion hole of the movable iron core 23 (both of which correspond to the movable member shaft insertion holes), and is coupled to the movable iron core 23 so as to be movable integrally in the axial direction of the shaft 24.

The plunger cap 26 is formed of a nonmagnetic material, for example, SUS304, and includes: a cylindrical body portion 261 having an inner diameter substantially equal to an outer diameter of the cylindrical portion 231 of the movable iron core 23; a flange portion 262 projecting radially outward from an upper end of the body portion 261; and a lower end bottom portion 263 that closes the lower end of the cylindrical body portion 261. The body portion 261 and the lower end bottom portion 263 of the plunger cap 26 are disposed in a bush 225, which will be described later in detail, in the insertion hole 212a of the bobbin 212, and the flange portion 262 of the plunger cap 26 is placed on the upper flange portion 212d of the bobbin 212. The movable iron core 23 is housed in the housing space of the body portion 261 of the plunger cap 26.

The yoke module 22 includes a yoke upper plate 223 (stationary core), a lower yoke 224, and a bushing 225.

The lower yoke 224 is made of a magnetic material and is disposed between the coil portion 21 and the housing 10. The lower yoke 224 includes a substantially rectangular bottom wall 224a disposed on the lower end surface side of the bobbin 212, and a pair of side walls 224b, 224b rising from both left and right edges of the bottom wall 224a and disposed on the side surface side of the bobbin 212, and the lower yoke 224 is open in the front-rear direction. Further, a circular insertion hole 224c is formed in the center of the bottom wall 224a of the lower yoke 224, and the insertion hole 224c is used for attaching a bushing 225.

The bushing 225 is formed of a magnetic material, is formed in a cylindrical shape, is disposed in the insertion hole 212a of the bobbin 212, and is inserted at a lower end thereof into an insertion hole 224c formed in the bottom wall 224a of the lower yoke 224 to be connected to the lower yoke 224. The plunger cap 26 is accommodated in the cylindrical space of the bushing 225.

The yoke upper plate 223 is made of a magnetic material, is formed in a substantially rectangular shape substantially the same as the bottom wall 224a, is disposed on the upper end side of the pair of side walls 224b, 224b of the lower yoke 224, and covers the coil portion 21, the movable core 23, and the plunger cap 26. An insertion hole 223a is provided through the center of the yoke upper plate 223, and the insertion hole 223a has an upper insertion hole (yoke upper plate shaft insertion hole) on the upper side and a lower insertion hole on the lower side. The upper insertion hole has a hole diameter size in which the shaft body portion 24a can be inserted but the return spring 25 cannot be inserted, and the hole diameter of the upper insertion hole is larger than the hole diameter of the lower insertion hole of the movable iron core 23 by the maximum allowable gap between the movable iron core 23 and the plunger cap. For example, referring to fig. 4, in the case where the maximum allowable gap between the silver plating layer 236 on the outer surface of the movable iron core 23 and the plunger cap 261 is, for example, 0.2mm, the aperture of the upper insertion hole of the yoke upper plate 223 is larger than the aperture of the lower insertion hole of the movable iron core 23 by 0.4mm or more. The lower insertion hole is coaxial with the upper insertion hole and has a diameter into which the return spring 25 can be inserted.

The return spring 25 is restricted by the lower insertion hole of the yoke upper plate 223 and the upper insertion hole 232 of the movable iron core 23.

The shaft 24 is inserted through the lower and upper insertion holes of the movable iron core 23 and the insertion hole 223a of the yoke upper plate 223, and the upper end side (the flange portion 24b side) thereof extends to the contact module 3.

In the drive module 2 configured as described above, the bushing 225 forms a magnetic path of the magnetic field generated by the coil 211 together with the yoke upper plate 223 (fixed iron core), the lower yoke 224, and the movable iron core 23. The movable iron core 23 reciprocates in the vertical direction (axial direction) in accordance with the switching of the coil 211, and the shaft 24 moves in the vertical direction together with the movable iron core 23 to be driven to open and close the contacts of the contact module 3.

[ contact Module 3 ]

The contact module 3 is disposed above the driving module 2, and the contacts of the contact module 3 are opened and closed according to the on/off of the coil 211.

The contact module 3 includes a box-shaped base (housing) 310 formed of a heat-resistant material such as ceramic that has been subjected to drying treatment and having an open bottom. The base body 310 includes a top wall 311 and a substantially square tubular peripheral wall 312 extending downward from the peripheral edge of the top wall 311, and the lower end of the peripheral wall 312 is connected to the yoke upper plate 223 of the drive module by, for example, a frame-shaped connecting body having substantially the same cross-sectional shape as the square tubular peripheral wall 312, thereby forming a housing space in the base body 310. The base 310 is not limited to being made of ceramic, and may be made of an insulating material such as glass or resin that has been subjected to drying treatment.

On the top wall 311 of the base 310, 2 fixed contacts 32 are provided side by side in the left-right direction.

In the housing space of the base 310, a movable contact of a substantially flat plate shape is held by a holder 313 described later and is disposed so as to straddle the two fixed contacts 32, and movable contacts 31 are provided on the upper surface of the movable contact at positions facing the two fixed contacts 32, respectively.

The holder 313 has an upper wall 313a and a lower side block 313b, and the upper wall 313a and the lower side block 313b face each other in the vertical direction. The holder 313 includes a front wall that connects the front end of the upper wall 313a to the front end of the lower block 313b, and a rear wall that connects the rear end of the upper wall 313a to the rear end of the lower block 313 b. The holder 313 has a hollow cylindrical shape having a hole penetrating in the left-right direction, and the movable contact passes between the upper wall 313a and the lower block 313 b.

A contact spring 314 is disposed between the lower block 313b of the holder 313 and the movable contact, and the contact spring 314, for example, a compression spring, is disposed between the lower block 313b of the holder 313 and the movable contact in a state where the axial direction (the expansion and contraction direction) is the vertical direction. The contact spring 314 applies an upward force to the movable contact, i.e., the contact spring 314 applies a force to the movable contact that approaches the fixed contact point 32. Thereby, the movable contact is held by the holder 313.

The lower side block 313b of the holder 313 is engaged with the flange portion 24b of the shaft 24.

An electrically insulating shielding member 315 is further accommodated in the accommodating space of the base 310, and the shielding member 315 is used for shielding an arc generated between the movable contact 31 and the fixed contact 32 in accordance with the movement of the movable contact 31. The shielding member 315 is made of an insulating material such as ceramic, glass, or resin, which has been subjected to a drying process.

In the contact module 3 configured as described above, the holder 313 moves in the vertical direction as the shaft 24 moves in the vertical direction, and the movable contact passing between the upper wall 313a and the lower block 313b of the holder 313 moves in the vertical direction, whereby the movable contact moves between the closed position where the movable contact 31 contacts the fixed contact 32 and the open position where the movable contact 31 is separated from the fixed contact 32.

The structure of the contact device 1 of embodiment 1 has been described above, and the contact device 1 having this structure can achieve the following advantageous effects.

In embodiment 1, by providing the small-diameter insertion hole 232b in the movable iron core 23 of the drive module 2, the end portion of the return spring 25 can be stably fixed, bending of the return spring 25 in the longitudinal direction due to unbalanced force applied to the end portion of the return spring 25 can be reduced or avoided, and abrasion of the movable iron core 23 due to contact between the return spring 25 and the inner side surface of the movable iron core 23 can be reduced or avoided.

In embodiment 1, by providing the large-diameter insertion hole 232a at the upper portion of the small-diameter insertion hole 232b of the movable iron core 23 of the drive module 2, even if the return spring 25 is bent in the longitudinal direction, it is possible to reduce or avoid the bent return spring 25 from contacting the inner side surface of the movable iron core 23 to cause abrasion of the movable iron core 23.

In the present embodiment 1, the air exhaust structure is formed between the movable iron core 23 and the plunger cap 26 by forming the cut 233 on the outer side surface of the movable iron core 23 of the drive module 2. When the movable iron core 23 moves up and down, air is discharged from the air discharge structure, so that the movable iron core 23 can move more smoothly, the possibility that the movable iron core 23 is pressed or contacted with the shaft 24, the plunger cap 26 and the like due to poor movement can be reduced, and abrasion of the movable iron core 23 due to the contact can be reduced or avoided.

In example 1, the silver (Ag) plating layer is formed on the surface of the movable core 23 of the drive module 2, so that the degree of matching between the shaft 24 and the plunger cap 26, which are nonmagnetic bodies, is higher in terms of tribology and the abrasion resistance is higher than that in the conventional case where a nickel plating layer is formed on the surface of the movable core. In addition, the movable iron core formed with the silver plating layer was also detected to have improved abrasion resistance by performing detection in a low humidity environment.

In embodiment 1, by setting the diameter of the upper insertion hole of the insertion holes 223a of the yoke upper plate 223 to be larger than the diameter of the lower insertion hole of the movable iron core 23 by the maximum allowable gap between the movable iron core 23 and the plunger cap, the shaft main body portion 24a does not come into contact with the side wall of the upper insertion hole in the case where the movable iron core 23 is horizontally displaced. Even if the coupling body of the movable iron core 23 and the shaft 24 is inclined and the movable iron core 23 contacts the plunger cap 26, the shaft body portion 24a does not contact the side wall of the upper insertion hole. This reduces contact between the shaft 24 and an undesired portion, and reduces the contact portion, thereby reducing factors that deteriorate the sliding characteristics of the shaft 24.

Example 2

A contact device 1' according to embodiment 2 of the present invention will be described with reference to fig. 7 to 9. Hereinafter, description will be mainly given mainly on the structure different from that of the contact device 1 of embodiment 1, and the same structure is given the same reference numerals and description thereof is omitted as appropriate.

The contact arrangement 1 ' is provided with a drive module 2 ' and a contact module 3 '.

[ Driving Module 2' ]

The drive module 2 ' includes a coil portion 21, a yoke block 22 ', a movable iron core (movable member) 23 ', a shaft 24 ', a return spring 25 ' wound around the shaft 24 ', a plunger cap 26 ', and a fixed iron core 28.

The coil portion 21 of embodiment 2 has the same structure as that of embodiment 1, and detailed description thereof is omitted here.

The movable iron core 23 ' of embodiment 2 differs from the movable iron core 23 of embodiment 1 in that it does not have a plurality of insertion holes having different diameters, but only has an insertion hole 232 ' (movable member shaft insertion hole) having a single diameter for inserting and fixing the shaft 24 '. The other structures are the same as those of movable iron core 23 of embodiment 1, and detailed description thereof is omitted here.

The drive module 2 ' of embodiment 2 includes a fixed core (fixed member) 28, and the fixed core 28 is inserted into the insertion hole 212a of the bobbin 212 so as to face the movable core 23 ' and is accommodated in a plunger cap 26 ' described later in detail. The fixed core 28 includes a cylindrical portion 281 as a main body portion, the cylindrical portion 281 having an insertion hole (fixed member shaft insertion hole) 282 for inserting the shaft 24 'and the return spring 25' coaxially with the insertion hole 232 'of the movable core 23'; and a flange portion 283 that protrudes radially outward from the upper end of the cylindrical portion 281. The fixed core 28 is magnetized by a magnetic field generated by the energized coil 211 (magnetic flux passes through the fixed core 28).

The shaft 24 ' of embodiment 2 is formed of a nonmagnetic material in the same manner as in embodiment 1, includes a shaft body portion 24a and a flange portion 24b, is inserted into the movable core 23 ' and is connected to the movable core 23 ' so as to be movable integrally in the axial direction of the shaft 24 ', and is different from embodiment 1 in that the shaft 24 ' is inserted through an insertion hole 282 of the fixed core 28.

The plunger cap 26 ' of embodiment 2 has the same structure as that of embodiment 1, except that the plunger cap 26 ' of embodiment 2 accommodates the cylindrical portion 281 of the fixed iron core 28 in addition to the movable iron core 23 ' in the accommodation space of the body portion 261. The fixed iron core 28 is disposed on the opening side of the plunger cap 26 ', and the movable iron core 23 ' is disposed below the fixed iron core 28 in the cylinder of the plunger cap 26 '.

A yoke module 22 ' of embodiment 2 includes a yoke upper plate 223 ', a lower yoke 224, and a bushing 225, as with the yoke module 22 of embodiment 1, wherein the configurations of the lower yoke 224 and the bushing 225 are the same as those of embodiment 1, and detailed description thereof is omitted and only the yoke upper plate 223 ' will be described.

The yoke upper plate 223' is made of a magnetic material and is formed in a substantially rectangular shape as the bottom wall 224 a. A through hole 223a 'through which the fixed core 28 passes is formed in the center of the yoke upper plate 223', and a recess 223b 'having a diameter substantially the same as that of the flange 283 of the fixed core 28 is formed substantially at the center of the upper surface of the yoke upper plate 223'. When the fixed core 28 is inserted, the cylindrical portion 281 of the fixed core 28 is inserted from the upper surface side of the yoke upper plate 223 ', and the flange portion 283 of the fixed core 28 is fitted into the recess portion 223 b' to prevent the fixed core 28 from coming off.

A metal platen 29 is provided on the upper surface side of the yoke upper plate 223 ', and the left and right end portions of the platen 29 are fixed to the upper surface of the yoke upper plate 223'. A projection is provided at the center of the pressure plate 29 to form a space for receiving the flange 283 of the fixed core 28, which projects from the upper surface of the yoke upper plate 223'.

A through-hole 291 into which the shaft 24 ' is inserted is formed in the hold-down plate 29, and the upper end side (flange portion 24b side) of the shaft 24 ' can be extended to the contact module 3 ' through the through-hole 282 of the fixed core 28 and the through-hole 291 of the hold-down plate 29.

The return spring 25 'is formed of, for example, a coil spring, and is disposed in the through hole 282 of the fixed core 28 in a state of being wound around the shaft 24'. The return spring 25 'is stopped by its upper end abutting against the lower surface of the protruding space of the presser plate 29 and its lower end abutting against the upper surface of the movable iron core 23'.

In the drive module 2 ' of embodiment 2, the bushing 225 forms a magnetic circuit together with the yoke upper plate 223 ', the lower yoke 224, the fixed iron core 28, and the movable iron core 23 '. In embodiment 2, similarly to embodiment 1, the movable iron core 23 'reciprocates in the vertical direction (axial direction) in accordance with the switching of the coil 211, and the shaft 24' moves in the vertical direction together with the movable iron core 23 'and is driven to open and close the contacts of the contact module 3'.

[ contact Module 3' ]

The contact module 3 ' of embodiment 2 differs from embodiment 1 in that a through hole through which the shaft 24 ' penetrates is formed substantially at the center of the movable contact, the flange portion 24b of the shaft 24 ' is joined to the upper wall 313a of the holder 313, and other configurations are the same as those of embodiment 1, and detailed description thereof is omitted.

In example 2, as in example 1, the wear of the movable iron core can be reduced or avoided, and the service life of the device can be extended.

The embodiments of the present invention have been described above, but the present invention is not limited to the described embodiments and various modifications can be made.

Modification example

In the embodiment, the example in which the movable core has two tangent planes 233 and the two tangent planes 233 has been described, but the present invention is not limited to this. In one possible implementation, a tangential surface extending from the lower surface 234 to the upper surface 235 of the movable core in the vertical direction may be formed at any one position or at three or more positions on the outer surface of the cylindrical portion of the movable core. As shown in fig. 10, the movable core may not have a tangent plane.

In the examples, the thickness of the silver plating layer was 6 μm, but the present invention is not limited thereto. The thickness of the silver plating layer can be set in a range of, for example, 3 μm to 9 μm, taking into consideration the enhancement of the wear resistance and the manufacturing cost in combination. Further, the thicker the thickness of the silver plating layer is, the stronger the abrasion resistance is, so that the silver plating layer may be set as thick as the design allows, according to the actual needs.

In the embodiments, the silver plating is formed on all the surfaces of the movable core, but the silver plating is formed on at least the inner surface or the outer surface of the movable core, and the abrasion of the movable core can be reduced to a certain extent as compared with the conventional case.

In the embodiments, the silver plating layer is formed on the surface of the movable core, but the present invention is not limited to this. For example, a copper (Cu) plating layer (third layer) and a silver (Ag) plating layer (first layer) may be stacked in this order from the surface of the movable core. When the silver plating layer is laminated with the copper plating layer as the base layer, the adhesion between the silver plating layer and the movable iron core can be enhanced. Further, a silver (Ag) plating layer and a copper (Cu) plating layer may be sequentially stacked on the surface of the movable core. With this structure, wear of the movable iron core can be reduced. The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. An electromagnet device, comprising:

a coil wound around the hollow bobbin and generating magnetic flux when energized;

a shaft made of a non-magnetic material and provided in the hollow space of the bobbin;

a movable member provided in the hollow space of the bobbin, the movable member being provided with a movable member shaft insertion hole through which the shaft is inserted; and

a plunger cap made of a non-magnetic material, provided in the hollow space of the bobbin, and surrounding the movable member,

wherein the shaft is inserted into the movable member shaft insertion hole and is connected to the movable member so as to be movable integrally in an axial direction of the shaft,

the movable member reciprocates in the axial direction in accordance with the switching of the coil, and includes a two-layer structure, a first layer made of a nonmagnetic material, including a surface of the movable member and having a predetermined thickness, and a second layer made of a magnetic material and located inside the first layer.

2. The electromagnet arrangement according to claim 1,

the plunger cap further includes a fixed member made of a magnetic material and provided in the plunger cap at a position closer to the opening of the plunger cap than the movable member, and a fixed member shaft insertion hole through which the shaft is inserted is provided in the fixed member coaxially with the movable member shaft insertion hole.

3. The electromagnet arrangement according to claim 1 or 2,

the first layer is formed of a silver plating layer having a thickness of 3 to 9 μm, and the plunger cap is formed of SUS304, which is stainless steel.

4. The electromagnet arrangement according to claim 1 or 2,

the movable member further includes a third layer which is interposed between the first layer and the second layer and is formed of a non-magnetic body different from the first layer.

5. The electromagnet arrangement according to claim 4,

the first layer is formed of a silver plating layer having a thickness of 3 to 9 μm, the third layer is formed of a copper plating layer, and the plunger cap is formed of SUS304, which is stainless steel.

6. The electromagnet arrangement according to claim 1,

the movable member shaft insertion hole includes: a first insertion through hole arranged at one end close to the opening of the plunger cap, a second insertion through hole arranged at one end close to the bottom of the plunger cap and coaxial with the first insertion through hole, and a third insertion through hole communicated with and coaxial with the first insertion through hole and the second insertion through hole, wherein the aperture of the first insertion through hole is larger than that of the third insertion through hole, and the aperture of the third insertion through hole is larger than that of the second insertion through hole,

the electromagnet device further includes a spring that is provided in the first insertion hole and the second insertion hole so as to surround the shaft, and a telescopic direction of the spring is an axial direction of the shaft.

7. The electromagnet arrangement according to claim 1 or 2,

the outer side surface of the movable member is constituted by a curved surface and a flat surface.

8. The electromagnet arrangement according to claim 1,

the electromagnet device further includes a yoke upper plate that covers the coil, the movable member, and the plunger cap from an opening direction of the plunger cap,

the yoke upper plate is provided with a yoke upper plate shaft insertion hole through which the shaft is inserted, the yoke upper plate shaft insertion hole being coaxial with the movable member shaft insertion hole, and a bore diameter of the yoke upper plate shaft insertion hole being set to be larger than a minimum bore diameter of the movable member shaft insertion hole by a maximum allowable gap between the movable member and the plunger cap.

9. A contact arrangement, comprising:

the electromagnet arrangement of any one of claims 1 to 8;

a fixed contact; and

and a movable contact provided to face the fixed contact, the movable contact being driven by the electromagnet device to come into contact with or separate from the fixed contact in accordance with the movement of the shaft in the axial direction.

10. An electromagnetic relay device, comprising:

the contact arrangement of claim 9.

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