Electromagnetic contactor

Abstract

To suppress an increase in size radially outward in an electromagnetic contactor while maintaining the amount of coil winding.SOLUTION: An electromagnetic contactor 11 includes a spool 22, a plunger 23, an armature 24, a permanent magnet 27, and a yoke 28. The spool 22 has a coil 32 wound around a winding shaft 31. The plunger 23 is inserted into the winding shaft 31 in a state of advancing and retreating. The armature 24 is connected to one end of the plunger 23. The permanent magnet 27 is disposed on one end side of the winding shaft 31. The yoke 28 is disposed on one end side of the permanent magnet 27, and attracts the armature 24 when the coil 32 is not excited.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to an electromagnetic contactor. [Background technology]

[0002] The electromagnetic contactor disclosed in Patent Document 1 drives a plunger to open and close the contacts, and a permanent magnet and an inner yoke are provided between an outer yoke and a coil. The permanent magnet and the inner yoke attract the armature when not excited, maintaining the released state. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. Hei 1-140606 Summary of the Invention [Problem to be solved by the invention]

[0004] When a permanent magnet and an inner yoke are provided between the outer yoke and the coil, the space available for winding the coil is restricted, so that the amount of winding of the coil is reduced or the coil becomes larger radially outward. An object of the present invention is to suppress an increase in size radially outwardly in an electromagnetic contactor while maintaining the winding amount of the coil. [Means for solving the problem]

[0005] An electromagnetic contactor according to one aspect of the present invention includes a spool, a plunger, a first armature, a permanent magnet, and a first yoke. The spool has a coil wound around a winding shaft. The plunger is inserted into the winding shaft in a state in which it can advance and retreat. The first armature is connected to one end of the plunger. The permanent magnet is disposed on one end side of the winding shaft. The first yoke is disposed on one end side of the permanent magnet, and attracts the first armature when the coil is non-excited. Effect of the Invention

[0006] According to the present invention, since the permanent magnet and the first yoke are disposed on one end of the winding shaft, the space for winding the coil is not restricted, and therefore it is possible to prevent the coil from becoming too large radially outward while maintaining the winding amount. [Brief description of the drawings]

[0007] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that each drawing is a schematic view and may differ from the actual one. In addition, the following embodiment illustrates an apparatus and method for embodying the technical idea of ​​the present invention, and does not specify the configuration as described below. In other words, the technical idea of ​​the present invention can be modified in various ways within the technical scope described in the claims.

[0009] <<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. FIG. 1A shows the electromagnetic contactor 11 as viewed from one side in the vertical direction, one side in the width direction, and from the front in the depth direction. FIG. 1B shows the electromagnetic contactor 11 as viewed from the front in the depth direction. The electromagnetic contactor 11 is an open type in which the contacts are not sealed, and includes a lower frame 12 and an upper frame 13. The lower frame 12 is disposed at the back in the depth direction. The upper frame 13 is fitted to the front in the depth direction of the lower frame 12. An arc-extinguishing cover 14 and a terminal cover 15 are fitted to the front in the depth direction of the upper frame 13. The upper frame 13 has three main terminals 16, an auxiliary terminal 17, and a coil terminal 18 provided on each of the two vertical sides.

[0010] FIG. 2 is a diagram showing the electromagnetic contactor 11. As shown in FIG. Here, a cross section of the electromagnetic contactor 11 passing through the center in the vertical direction and along the width and depth directions is shown as viewed from one vertical direction. The lower frame 12 is formed in a box shape with both sides in the vertical direction, both sides in the width direction, and the back in the depth direction closed, and the front side in the depth direction open. The upper frame 13 is formed in a box shape with both sides in the vertical direction, both sides in the width direction, and the back in the depth direction closed, and the front side in the depth direction open. The electromagnetic contactor 11 includes an electromagnet section 21 and a contact support 41. The electromagnet section 21 is housed in the lower frame 12 and includes an operating axis A1 that operates along the width direction. The contact support 41 is housed in the upper frame 13 and includes an operating axis A2 that operates along the width direction. The operating axis A1 and the operating axis A2 are parallel to each other and are separated in the depth direction.

[0011] FIG. 3 is a diagram showing the electromagnet portion 21. As shown in FIG. Here, the electromagnet section 21 is shown disassembled and viewed from one side in the vertical direction, one side in the width direction, and from the front in the depth direction. The electromagnet section 21 includes a spool 22, a plunger 23, an armature 24 (first armature), an armature 25 (second armature), a pair of yokes 26 (second yokes), a pair of permanent magnets 27, and a yoke 28 (first yoke). The electromagnet section 21 is a polarized DC type in which the direction in which current flows through the coil is constant. 2, the spool 22 is made of insulating resin, and has a coil 32 wound around a cylindrical winding shaft 31 extending in the width direction. One end of the coil 32 is connected to one coil terminal 18, and the other end is connected to the other coil terminal 18.

[0012] The plunger 23 is a cylindrical movable core extending in the width direction, and is inserted inside the winding shaft 31 in a state in which it can advance and retreat in the axial direction. The plunger 23 is longer than the winding shaft 31. The armature 24 is a plate-shaped yoke extending in the vertical and depth directions, and is connected to one end of the plunger 23. The armature 24 is formed in a substantially rectangular shape when viewed in the width direction, and is formed with a lever 36 that protrudes forward in the depth direction. As shown in Fig. 2, the lever 36 enters from an opening formed in the bottom of the upper frame 13 and fits into the contact support 41. The armature 25 is a plate-shaped yoke extending in the vertical and depth directions, and is connected to the other end of the plunger 23. The armature 25 is formed in a substantially rectangular shape when viewed in the width direction.

[0013] The yoke 26 is a generally U-shaped yoke that covers the outer side in the vertical direction and both sides in the width direction and opens toward the inner side in the vertical direction when viewed from the depth direction. The pair of yokes 26 are fitted to the spool 22 from both sides in the vertical direction. The permanent magnets 27 are columnar and extend in the depth direction, and are provided one on each side of the armature 24 in the vertical direction. The yoke 28 is a plate-shaped yoke extending in the vertical and depth directions, and is attracted to the permanent magnet 27 on the outer side of the armature 24 in the width direction.

[0014] FIG. 4 is a view showing the upper frame 13. As shown in FIG. Here, a cross section of the upper frame 13 along the vertical and width directions passing through the operating axis A2 is shown as viewed from the front in the depth direction. The upper frame 13 is provided with three main fixed contacts 42 (fixed contacts) and an auxiliary fixed contact 43 on each of both vertical sides. The main fixed contact 42 is made of a conductive metal, is formed in a plate shape extending in the vertical direction and along the vertical and depth directions, and is molded integrally with the terminal block of the main terminal 16. The main fixed contact 42 has a main fixed contact formed on an end surface facing the other side in the width direction at an inner end in the vertical direction. The auxiliary fixed contact 43 is made of a conductive metal, is formed in a plate shape extending in the vertical direction and along the vertical and depth directions, and is molded integrally with the terminal block of the auxiliary terminal 17. The auxiliary fixed contact 43 has an auxiliary fixed contact formed on an end surface facing the other side in the width direction at an inner end in the vertical direction.

[0015] The contact support 41 is provided with three main movable contacts 44 (movable contacts) and an auxiliary movable contact 45. The main movable contact 44 is made of a metal having electrical conductivity, and is formed in a plate shape extending in the vertical direction and along the vertical and depth directions, and in a hat shape that is convex to one side in the width direction when viewed from the depth direction. The main movable contact 44 has main movable contacts facing the main fixed contacts formed on end faces facing one side in the width direction at both ends. The auxiliary movable contact 45 is made of a metal having electrical conductivity, and is formed in a plate shape extending in the vertical direction and along the vertical and depth directions, and in a hat shape that is convex to one side in the width direction when viewed from the depth direction. The auxiliary movable contact 45 has auxiliary movable contacts facing the auxiliary fixed contacts formed on end faces facing one side in the width direction at both ends. The main movable contact 44 and the auxiliary movable contact 45 are each biased in one side in the width direction by a contact spring 46. 2, the contact support 41 is biased in the other width direction by a back spring 47. A cover 48 is fitted onto the contact support 41 from the front in the depth direction.

[0016] With the above configuration, in a non-excited state where the coil 32 is not energized, the magnetic force of the permanent magnet 27 and the repulsive force of the back spring 47 displace the plunger 23 to the other side in the width direction as shown in FIG. 2. The magnetic flux of the permanent magnet 27 passes through the permanent magnet 27, the yoke 28, the armature 24, the other side in the width direction of the plunger 23, and the other side in the width direction of the yoke 26 in this order. The armature 24 is attracted to the yoke 28 by this closed-loop magnetic circuit. Thus, when the plunger 23 is displaced to the other side in the width direction, the contact support 41 is also displaced to the other side in the width direction via the lever 36, and the contact is in an open released state. At this time, the armature 25 is separated from one side in the width direction of the yoke 26, and the armature 24 is separated from the other side in the width direction of the yoke 26.

[0017] When the coil 32 is energized and excited from this state, the armature 25 is attracted to one side of the yoke 26 in the width direction by the magnetic force of the coil 32, and the armature 24 is attracted to the other side of the yoke 26 in the width direction. As a result, the plunger 23 is displaced to one side of the width direction against the magnetic force of the permanent magnet 27 and the repulsive force of the back spring 47. The magnetic flux of the coil 32 passes through the plunger 23, the armature 24, the yoke 26, and the armature 25 in this order. By this closed-loop magnetic circuit, the armature 25 is attracted to one side of the yoke 26 in the width direction, and the armature 24 is attracted to the other side of the yoke 26 in the width direction. In this way, when the plunger 23 is displaced to one side of the width direction, the contact support 41 is also displaced to one side of the width direction via the lever 36, and the contact is closed to enter the closed state. At this time, the armature 24 is separated from the yoke 28.

[0018] FIG. 5 is a diagram showing the electromagnetic contactor 11. As shown in FIG. Here, the disassembled electromagnetic contactor 11 is shown as seen from one side in the vertical direction, one side in the width direction, and from the front in the depth direction. When assembling the electromagnetic contactor 11, the electromagnet part 21 is housed in the lower frame 12, the upper frame 13 is fitted into the lower frame 12, and the contact support 41 is housed in the upper frame 13. FIG. 6 is a view showing the lower frame 12. As shown in FIG. Here, the lower frame 12 is shown as viewed from the front in the depth direction. The lower frame 12 has ribs 51 formed on both vertical sides of the inner circumferential surface on both sides in the width direction. One rib 51 in the width direction contacts the yoke 26, and the other rib 51 in the width direction contacts the yoke 28, thereby positioning the electromagnet portion 21 in the width direction.

[0019] <Action and Effect> Next, main effects of the embodiment will be described. The electromagnetic contactor 11 includes a spool 22, a plunger 23, an armature 24, a permanent magnet 27, and a yoke 28. The spool 22 includes a winding shaft 31 on which a coil 32 is wound. The plunger 23 is inserted into the winding shaft 31 in a state in which it can advance and retreat. The armature 24 is connected to one end of the plunger 23. The permanent magnet 27 is disposed on one end side of the winding shaft 31. The yoke 28 is disposed on one end side of the permanent magnet 27, and attracts the armature 24 when the coil 32 is not excited. In this way, since the permanent magnet 27 and the yoke 28 are disposed on one end side of the winding shaft 31, the space for winding the coil 32 is not restricted. Therefore, it is possible to suppress an increase in size in the radial outward direction while maintaining the winding amount of the coil 32. One end of the winding shaft 31 is originally reserved as a stroke allowance for the armature 24, and since the permanent magnet 27 is disposed there, the electromagnet section 21 does not become large in size in the axial direction. In addition, the armature 24 is attracted to the yoke 28 when not excited, so that the position of the plunger 23 can be maintained.

[0020] The electromagnetic contactor 11 includes an armature 25 and a yoke 26. The armature 25 is connected to the other end of the plunger 23. The yoke 26 closes one axial end side, the outer side in the radial direction, and the other axial end side, and attracts the armature 25 and the armature 24 when the coil 32 is excited. That is, when excited, the armature 25 is attracted to one side of the yoke 26 in the width direction, and the armature 24 is attracted to the other side of the yoke 26 in the width direction. This makes it possible to hold the position of the plunger 23 when excited.

[0021] The spool 22, the plunger 23, the armature 24, the permanent magnet 27, the yoke 28, the armature 25, and the yoke 26 constitute the electromagnet section 21. The electromagnetic contactor 11 includes a contact support 41, a lower frame 12, and an upper frame 13. The contact support 41 brings the main movable contact 44 into contact with and separates it from the main fixed contact 42. The lower frame 12 is disposed at the back in the depth direction, and houses the electromagnet section 21 with the operating axis A1 perpendicular to the depth direction. The upper frame 13 is disposed at the front in the depth direction, and houses the contact support 41 with the operating axis A2 parallel to the axial direction of the electromagnet section 21. The armature 24 is formed with a lever 36 that protrudes toward the front in the depth direction and transmits a driving force to the contact support 41. In this way, by not arranging the operating axis A1 of the electromagnet section 21 and the operating axis A2 of the contact support 41 on the same axis, it is possible to reduce the size in the depth direction. The electromagnet portion 21 is positioned by the inner peripheral surface of the lower frame 12 that faces it in the axial direction via the yoke 28 and the yoke 26. This makes it possible to stabilize the stroke amount of the plunger 23 compared to a configuration in which the electromagnet portion 21 is positioned via the spool 22, which is a resin molded product.

[0022] Next, a comparative example will be described. The comparative example has a similar configuration to the above-described embodiment except for the layout of the permanent magnets and yokes. Therefore, the common parts are given the same reference numerals and detailed description is omitted. FIG. 7 is a diagram showing a comparative example. In the electromagnet section 61 serving as a comparative example, a permanent magnet 67 and a yoke 68 (inner yoke) are provided between the yoke 26 (outer yoke) and the coil 32. The permanent magnet 67 and the yoke 68 attract the armature 25 and maintain a released state when not excited. When the permanent magnet 67 and the yoke 68 are provided between the yoke 26 and the coil 32 in this way, the space for winding the coil 32 is restricted, which causes a problem that the amount of winding of the coil 32 is reduced or the coil 32 becomes larger radially outward.

[0023] Although the above description has been given with reference to a limited number of embodiments, the scope of the invention is not limited thereto, and modifications of the embodiments based on the above disclosure will be obvious to those skilled in the art. [Explanation of symbols]

[0024] 11...electromagnetic contactor, 12...lower frame, 13...upper frame, 14...arc-extinguishing cover, 15...terminal cover, 16...main terminal, 17...auxiliary terminal, 18...coil terminal, 21...electromagnet section, 22...spool, 23...plunger, 24...armature, 25...armature, 26...yoke, 27...permanent magnet, 28...yoke, 31...winding shaft, 32...coil, 36...lever, 41...contact support, 42...main fixed contact, 43...auxiliary fixed contact, 44...main movable contact, 45...auxiliary movable contact, 46...contact spring, 47...back spring, 48...cover, 51...rib, 61...electromagnet section, 67...permanent magnet, 68...yoke

Claims

1. A spool with a coil wound around it, a plunger inserted through the winding shaft in a retractable state; a first armature coupled to one end of the plunger; A permanent magnet disposed on one end side of the winding shaft; a first yoke disposed on one end side of the permanent magnet and adapted to attract the first armature when the coil is in a non-excited state.

2. a second armature coupled to the other end of the plunger; a second yoke that closes one axial end side, a radial outside side, and the other axial end side, and attracts the second armature and the first armature when the coil is excited.

3. an electromagnet unit is configured by the spool, the plunger, the first armature, the permanent magnet, the first yoke, the second armature, and the second yoke; a contact support for bringing the movable contact into contact with and separating the fixed contact; a lower frame that is disposed at the back in a depth direction and that houses the electromagnet unit with an operating axis perpendicular to the depth direction; an upper frame disposed at the front in the depth direction and accommodating the contact support with an operating axis parallel to the operating axis of the electromagnet portion; 3. The electromagnetic contactor according to claim 2, wherein the first armature is formed with a lever that protrudes toward the front in the depth direction and transmits a driving force to the contact support.

4. 4. The electromagnetic contactor according to claim 3, wherein the electromagnet portion is positioned by an inner peripheral surface of the lower frame that faces the electromagnet portion in the axial direction via the first yoke and the second yoke.

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