JP7517624B2 - Polarized DC electromagnet device, electromagnetic contactor - Google Patents

Description

The present invention relates to a polarized DC electromagnet device and an electromagnetic contactor.

As shown in Patent Document 1, the polarized DC electromagnet device of the electromagnetic contactor drives a plunger to open and close the contacts, and a permanent magnet and an inner yoke are provided inside the outer yoke. The permanent magnet has the function of attracting the armature to the inner yoke when not excited, thereby maintaining the position of the plunger.

International Publication No. 2015/177960

The inner yoke is supported by fitting its upper and lower ends onto the spool, but there was a risk that the inner yoke would fall off or become misaligned relative to the spool due to vibrations and impacts during assembly, as well as the attractive forces generated when a permanent magnet or outer yoke was brought close to it.
An object of the present invention is to prevent the inner yoke from coming off or becoming displaced during assembly in a polarized DC electromagnet device.

A polarized DC electromagnet device according to one aspect of the present invention includes a spool and an inner yoke. The spool has a cylindrical portion extending in the depth direction, on which a coil is wound, and flanges are formed on both sides of the cylindrical portion in the depth direction. The inner yoke is formed in a flat plate shape extending parallel to the depth direction, and both edge portions in the depth direction are fitted into the flanges. The flanges are formed with claw portions for holding the fitted inner yoke.
An electromagnetic contactor according to another aspect of the present invention includes a polarized DC electromagnet device, and the contacts are opened and closed by the polarized DC electromagnet device.

According to the present invention, the inner yoke is held by the claw portion, which prevents the inner yoke from falling off or becoming misaligned during assembly.

FIG. FIG. 2 is a diagram showing a polarized DC electromagnet device. FIG. 2 is a cross-sectional view showing a polarized DC electromagnet device. 13A and 13B are diagrams showing the spool and the claw portion on the front side in the depth direction. 13A and 13B are views showing the spool and the claw portion on the far side in the depth direction. FIG. 4 is a diagram showing an inner yoke and a permanent magnet. FIG. 4 is a diagram showing a state in which the inner yoke is assembled to the spool. FIG.

Below, an embodiment of the present invention will be described with reference to the drawings. Note that each drawing is schematic and may differ from the actual product. Furthermore, the following embodiments are intended to exemplify devices and methods for embodying the technical ideas of the present invention, and are not intended to specify the configuration as described below. In other words, the technical ideas of the present invention can be modified in various ways within the technical scope described in the claims.

<<Embodiment>>
"composition"
In the following description, the three mutually orthogonal directions will be referred to as a vertical direction, a width direction, and a depth direction for the sake of convenience.
FIG. 1 is a diagram showing an electromagnetic contactor 11. As shown in FIG.
Here, the electromagnetic contactor 11 is shown as viewed from the other side in the vertical direction, one side in the width direction, and from the front side in the depth direction. The electromagnetic contactor 11 includes a lower frame 12 and an upper frame 13.

FIG. 2 is a diagram showing the polarized DC electromagnet device 21. As shown in FIG.
Here, the polarized DC electromagnet device 21 is shown as seen from the other side in the vertical direction, one side in the width direction, and from the front side in the depth direction. The polarized DC electromagnet device 21 is housed inside the lower frame 12, and opens and closes the contacts by switching between non-excitation and excitation.
FIG. 3 is a cross-sectional view showing the polarized DC electromagnet device 21. As shown in FIG.
Here, a cross section of the polarized DC electromagnet device 21 is shown, taken along the vertical and depth directions through the center in the width direction, as viewed from one side in the width direction. The polarized DC electromagnet device 21 includes a spool 22, a plunger 23, an upper armature 24 (first armature), a lower armature 25 (second armature), an outer yoke 26, an inner yoke 27, a permanent magnet 28, and a return spring 29.

The spool 22 is made of insulating resin, and has a coil 32 wound around a cylindrical portion 31 that extends in the depth direction. Diametrically protruding flanges 33 are formed on both sides of the cylindrical portion 31 in the depth direction.
The plunger 23 is a cylindrical movable core, and is inserted into the cylindrical portion 31 of the spool 22 in a state in which it can advance and retreat in the axial direction. The plunger 23 is longer than the cylindrical portion 31 in the axial direction.
The upper armature 24 is an iron plate extending in the vertical and width directions and having a substantially rectangular shape when viewed from the depth direction, and is connected to the end of the plunger 23 on the front side in the depth direction by, for example, caulking.
The lower armature 25 is an iron plate extending in the vertical and width directions and having a substantially rectangular shape when viewed from the depth direction, and is connected to the end of the plunger 23 on the far side in the depth direction by, for example, caulking.

The outer yoke 26 is provided on one side in the vertical direction and on the other side, and each is a yoke formed in a roughly U-shape that opens toward the inside in the vertical direction when viewed from the width direction. The outer yoke 26 has a side piece portion 36, an upper piece portion 37, and a lower piece portion 38. The side piece portion 36 is formed in a plate shape along the width direction and the depth direction. The upper piece portion 37 protrudes toward the inside in the vertical direction from the end portion on the front side in the depth direction of the side piece portion 36, and is formed in a plate shape along the vertical direction and the width direction. The upper piece portion 37 is provided between the upper armature 24 and the flange 33 on the front side in the depth direction so as to contact the flange 33. The lower piece portion 38 protrudes toward the inside in the vertical direction from the end portion on the rear side in the depth direction of the side piece portion 36, and is formed in a plate shape along the vertical direction and the width direction. The lower piece portion 38 is provided on the opposite side of the flange 33 on the rear side in the depth direction, sandwiching the lower armature 25. The side piece portion 36, the upper piece portion 37, and the lower piece portion 38 are integrally formed by pressing.

The inner yokes 27 are flat plate-shaped yokes extending along the width and depth directions, one on each side in the longitudinal direction. The inner yokes 27 are supported by being fitted into flanges 33 of the spool 22 at both ends in the depth direction.
The permanent magnet 28 is a substantially rectangular parallelepiped, and is interposed between the side piece 36 of the outer yoke 26 and the inner yoke 27 on the far side in the depth direction, and is fixed by being attracted to both the side piece 36 and the inner yoke 27. The permanent magnet 28 has, for example, a north pole on the outside and a south pole on the inside.
The return spring 29 is interposed between the inner bottom surface of the lower frame 12 and the lower armature 25, and biases the plunger 23 towards the front in the depth direction via the lower armature 25.

With the above configuration, in a non-excited state where the coil 32 is not energized, the magnetic force of the permanent magnet 28 and the repulsive force of the return spring 29 displace the plunger 23 to the front side in the depth direction. The magnetic flux of the permanent magnet 28 passes through the outside of the permanent magnet 28, the side piece 36, the upper piece 37, the plunger 23, the lower armature 25, and the inner yoke 27 in order, and reaches the inside of the permanent magnet 28. The lower armature 25 is attracted to the lower end of the inner yoke 27 by this closed-loop magnetic circuit. Thus, when the plunger 23 is displaced to the front side in the depth direction, the contact opens via the contact support (not shown), and the plunger 23 is in a released state. At this time, the upper armature 24 is separated from the upper piece 37, and the lower armature 25 is separated from the lower piece 38.

When the coil 32 is energized and excited from this state, the upper armature 24 is attracted to the upper arm portion 37 by the magnetic force of the coil 32, and the lower armature 25 is attracted to the lower arm portion 38. As a result, the plunger 23 is displaced toward the back in the depth direction against the magnetic force of the permanent magnet 28 and the repulsive force of the return spring 29. The magnetic flux of the coil 32 passes through the front side of the plunger 23 in the depth direction, the upper armature 24, the upper arm portion 37, the side arm portion 36, the lower arm portion 38, and the lower armature 25 in order, and reaches the back side of the plunger 23 in the depth direction. This closed-loop magnetic circuit attracts the upper armature 24 to the upper arm portion 37, and attracts the lower armature 25 to the lower arm portion 38. Thus, when the plunger 23 is displaced toward the back in the depth direction, the contacts are closed via the contact support (not shown), and the plunger 23 is in the closed state. At this time, the lower armature 25 is spaced apart from the lower end of the inner yoke 27 .

Next, fitting of the inner yoke 27 will be described.
FIG. 4 is a diagram showing the spool 22 and the claw portion 41 on the front side in the depth direction.
FIG. 1A shows the spool 22 as viewed from the other side in the vertical direction, one side in the width direction, and the back in the depth direction. At the front side in the depth direction, the flange 33 of the spool 22 is formed with a claw portion 41 for holding the inner yoke 27. There are four claw portions 41 in total: one on one side in the width direction on one side of the vertical direction, one on the other side of the width direction on one side of the vertical direction, one on one side of the width direction on the other side of the vertical direction, and one on the other side of the width direction on the other side of the vertical direction. The two claw portions 41 provided on one side in the vertical direction and the two claw portions 41 provided on the other side in the vertical direction are each formed at the same position as viewed in the width direction.

(b) in the figure shows the state of the claw portion 41 arranged on one side of the width direction at the other side of the vertical direction, viewed from one side of the width direction. The flange 33 has an inner end surface 42 and a bottom surface 43. The inner end surface 42 faces outward in the vertical direction, and the bottom surface 43 faces inward in the depth direction. The claw portion 41 has an outer end surface 44 and an inclined surface 45. The outer end surface 44 faces the inner end surface 42 with a gap of the thickness of the inner yoke 27, and the inclined surface 45 faces inward in the depth direction and outward in the vertical direction. The depth dimension of the outer end surface 44 is the height of the claw portion 41 and is set smaller than the depth dimension of the inner end surface 42. The edge of the inner yoke 27 is fitted into the recessed groove 46 formed by the inner end surface 42, the bottom surface 43, and the outer end surface 44.

FIG. 5 is a diagram showing the spool 22 and the claw portion 51 on the rear side in the depth direction.
FIG. 1A shows the spool 22 as viewed from the other side in the vertical direction, one side in the width direction, and from the front side in the depth direction. At the rear side in the depth direction, the flange 33 of the spool 22 is formed with a claw portion 51 for holding the inner yoke 27. There are four claw portions 51 in total, one on one side in the width direction on one side of the vertical direction, one on the other side of the width direction on one side of the vertical direction, and one on the other side of the width direction on the other side of the vertical direction. The two claw portions 51 provided on one side of the vertical direction and the two claw portions 51 provided on the other side of the vertical direction are formed at the same position as viewed from the width direction. Each claw portion 51 is formed at the same position as each claw portion 41 as viewed from the depth direction.

(b) in the figure shows the state of the claw portion 51 arranged on one side of the width direction at the other side of the vertical direction, viewed from one side of the width direction. The flange 33 has an inner end surface 52 and a bottom surface 53. The inner end surface 52 faces outward in the vertical direction, and the bottom surface 53 faces inward in the depth direction. The claw portion 51 has an outer end surface 54 and an inclined surface 55. The outer end surface 54 faces the inner end surface 52 with a gap of the thickness of the inner yoke 27, and the inclined surface 55 faces inward in the depth direction and outward in the vertical direction. The depth dimension of the outer end surface 54 is the height of the claw portion 51 and is set smaller than the depth dimension of the inner end surface 52. The edge of the inner yoke 27 is fitted into the recessed groove 56 formed by the inner end surface 52, the bottom surface 53, and the outer end surface 54.

FIG. 6 is a diagram showing the inner yoke 27 and the permanent magnet 28. As shown in FIG.
FIG. 1A shows the inner yoke 27 as viewed from the outside in the vertical direction, one side in the width direction, and the front in the depth direction. The four corners of the inner yoke 27 as viewed from the vertical direction are edges 61 that fit into the recessed grooves 46 and 56. The inner yoke 27 protrudes between the edges 61 on the rear side in the depth direction toward the rear side in the depth direction, and the lower armature 25 is attracted to the lower end 62. The inner yoke 27 has an opening 63 formed on the front side in the depth direction. The opening 63 is substantially rectangular as viewed from the vertical direction, and penetrates the inner yoke 27 in the vertical direction. The inner yoke 27 has two protrusions 64 formed on the rear side in the depth direction of the wall surface facing the outside in the vertical direction.
FIG. 1B shows the permanent magnet 28 as viewed from the inside in the vertical direction, one side in the width direction, and from the front in the depth direction. The permanent magnet 28 has two recesses 65 formed on a wall surface facing the inside in the vertical direction, which fit into the protrusions 64. Therefore, when the permanent magnet 28 is attracted to the inner yoke 27, the pair of recesses 65 fit into the pair of protrusions 64, thereby positioning the permanent magnet 28.

FIG. 7 is a diagram showing a state in which the inner yoke 27 is assembled to the spool 22. As shown in FIG.
FIG. 1A shows the spool 22 fitted with the inner yoke 27 as viewed from one side in the width direction. FIG. 1B shows the spool 22 fitted with the inner yoke 27 as viewed from the other side in the vertical direction. Here, the coil 32 is omitted. The inner yoke 27 is fitted between the flanges 33, and the four corners as viewed from the vertical direction are held by the claws 41 and 51. When fitting the inner yoke 27, the edge 61 of the inner yoke 27 abuts against the inclined surfaces 45 and 55, but by pressing it hard, the resin flange 33 is deflected, and the edge 61 of the inner yoke 27 fits into the grooves 46 and 56. In the case of manual work, for example, the two edge parts 61 are hooked into the two grooves 56 on the back side in the depth direction, and then the remaining two edge parts 61 are pressed into the two grooves 46 on the front side in the depth direction. After the inner yoke 27 is fitted onto the spool 22 , a permanent magnet 28 is attached to the inner yoke 27 , and then the outer yoke 26 is attached to the spool 22 .

<Action and Effect>
Next, main effects of the embodiment will be described.
The polarized DC electromagnet device 21 includes a spool 22 and an inner yoke 27. The spool 22 has a cylindrical portion 31 extending in the depth direction, on which a coil 32 is wound, and flanges 33 are formed on both sides in the depth direction of the cylindrical portion 31. The inner yoke 27 is formed in a flat plate shape extending parallel to the depth direction, and edge portions 61 on both sides in the depth direction are fitted into the flanges 33. The flange 33 is formed with claw portions 41 and 51 for holding the fitted inner yoke 27. Therefore, since the inner yoke 27 is held by the claw portions 41 and 51, it is possible to suppress the inner yoke 27 from falling off or becoming misaligned during assembly.

The polarized DC electromagnet device 21 includes a plunger 23, an upper armature 24, a lower armature 25, an outer yoke 26, and a permanent magnet 28. The plunger 23 is inserted into the cylindrical portion 31. The upper armature 24 is connected to the front side of the plunger 23 in the depth direction. The lower armature 25 is connected to the rear side of the plunger 23 in the depth direction. The outer yoke 26 is formed in a U-shape, with one end side disposed between the upper armature 24 and the flange 33 on the front side in the depth direction, and the other end side disposed on the opposite side of the flange 33 across the lower armature 25 on the rear side in the depth direction, and the center facing the inner yoke 27. The permanent magnet 28 is provided between the inner yoke 27 and the outer yoke 26. When the coil 32 is not excited, the permanent magnet 28 attracts the lower armature 25 to the inner yoke 27. When the coil 32 is excited, it attracts the upper armature 24 to one end side of the outer yoke 26, and attracts the lower armature 25 to the other end side of the outer yoke 26. Therefore, by switching between excited and non-excited states, the plunger 23 can be advanced and retreated to open and close the contacts.

The permanent magnet 28 is disposed at the rear side in the depth direction of the inner yoke 27. By disposing the permanent magnet 28 at the rear side in the depth direction, the attractive force of the lower end portion 62 of the inner yoke 27 to the lower armature 25 can be increased.
An opening 63 is formed on the inner yoke 27 at the front side in the depth direction, thereby making it possible to reduce the weight of the polarized DC electromagnet device 21.

The flange 33 has an inner end surface 42 (or 52) and a bottom surface 43 (or 53). The inner end surface 42 (or 52) faces outward in the vertical direction perpendicular to the depth direction. The bottom surface 43 (or 53) faces inward in the depth direction. The claw portion 41 (or 51) has an outer end surface 44 (or 54) and an inclined surface 45 (or 55). The outer end surface 44 (or 54) faces the inner end surface 42 (or 52) with a gap of the thickness of the inner yoke 27. The inclined surface 45 (or 55) faces inward in the depth direction and outward in the vertical direction. The edge portion 61 of the inner yoke 27 is fitted into a groove 46 (or 56) formed by the inner end surface 42 (or 52), the bottom surface 43 (or 53), and the outer end surface 44 (or 54). As a result, the edge portion 61 of the inner yoke 27 is held by the recessed grooves 46 and 56, which makes it possible to prevent the inner yoke 27 from falling off or becoming misaligned during assembly.
The electromagnetic contactor 11 includes a polarized DC electromagnet device 21, and the contacts are opened and closed by the polarized DC electromagnet device 21. Therefore, it is possible to provide an electromagnetic contactor 11 in which the inner yoke 27 is prevented from falling off or becoming misaligned during assembly.

Next, a comparative example will be described.
FIG. 8 is a diagram showing a comparative example.
The comparative example is similar to the embodiment described above except that the claws 41 and 51 are omitted, so the same reference numerals are used for the common parts and detailed description is omitted. The inner yoke 27 is supported by fitting its upper and lower ends into the flange 33 of the spool 22. That is, the upper end is supported by the recessed corner of the inner end face 42 and the bottom face 43, and the lower end is supported by the recessed corner of the inner end face 52 and the bottom face 53. Therefore, there is a possibility that the inner yoke 27 may fall off or become misaligned with respect to the spool 22 due to vibrations and impacts during assembly, or due to attractive forces when the permanent magnet 28 or the outer yoke 26 is brought close to the inner yoke 27.

The above has been described with reference to a limited number of embodiments, but the scope of the rights is not limited thereto, and modifications of the embodiments based on the above disclosure will be obvious to those skilled in the art.

11...electromagnetic contactor, 12...lower frame, 13...upper frame, 21...polarized DC electromagnet device, 22...spool, 23...plunger, 24...upper armature, 25...lower armature, 26...outer yoke, 27...inner yoke, 28...permanent magnet, 29...return spring, 31...cylindrical portion, 32...coil, 33...flange, 36...side piece portion, 37...upper piece portion, 38...lower piece portion, 41...claw portion, 42...inner end surface, 43...bottom surface, 44...outer end surface, 45...inclined surface, 46...groove, 51...claw portion, 52...inner end surface, 53...bottom surface, 54...outer end surface, 55...inclined surface, 56...groove, 61...edge portion, 62...lower end portion, 63...opening, 64...convex portion, 65...concave portion

Claims (6)

a spool having a coil wound around a cylindrical portion extending in a depth direction, the cylindrical portion having flanges formed on both sides in the depth direction;
an inner yoke formed in a flat plate shape extending parallel to a depth direction, the edges of both sides in the depth direction being fitted into the flanges;
a flange having a claw portion for holding the inner yoke fitted therein, A plunger inserted into the cylindrical portion;
a first armature connected to a front side of the plunger in a depth direction;
a second armature connected to a rear side of the plunger in a depth direction;
an outer yoke formed in a U-shape, one end side of which is disposed between the first armature and the flange on the front side in the depth direction, and the other end side of which is disposed on the opposite side of the flange with the second armature in between on the back side in the depth direction, and the center of which faces the inner yoke;
a permanent magnet provided between the inner yoke and the outer yoke,
When the coil is not excited, the second armature is attracted to the inner yoke by the permanent magnet;
2. The polarized DC electromagnet device according to claim 1, wherein when the coil is excited, the first armature is attracted to one end side of the outer yoke, and the second armature is attracted to the other end side of the outer yoke. A polarized DC electromagnet device as described in claim 2, characterized in that the permanent magnet is arranged at the rear side in the depth direction of the inner yoke. A polarized DC electromagnet device as described in claim 2, characterized in that the inner yoke has an opening formed on the front side in the depth direction. The flange is
An inner end surface facing outward in a vertical direction perpendicular to the depth direction;
A bottom surface facing inward in a depth direction,
The claw portion is
an outer end surface facing the inner end surface with a space corresponding to the thickness of the inner yoke;
and an inclined surface facing inward in the depth direction and outward in the vertical direction;
2. The polarized DC electromagnet device according to claim 1, wherein the edge portion of the inner yoke is fitted into a groove defined by the inner end surface, the bottom surface, and the outer end surface. A polarized DC electromagnet device according to claim 1,
An electromagnetic contactor in which the polarized DC electromagnet device opens and closes the contacts.

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