Electromagnetic operating mechanism

Abstract

To provide a compact and lightweight electromagnetic operation mechanism including both a magnetic path with a large surface area to transmit a magnetic flux efficiently in a fluctuating magnetic flux state and a magnetic path with a large cross-sectional area to transmit a magnetic flux efficiently in a stable magnetic flux state while maintaining a mechanical strength constant.SOLUTION: An electromagnetic operation mechanism 3 has a plurality of magnetic paths and transmits magnetic flux through a magnetic path to separate and contact a pair of electrodes 5a, 5b with each other. A plurality of magnetic paths is designed to include a surface area-enlarged magnetic path with an enlarged surface area so as to transmit a magnetic flux that fluctuates when separating or contacting a pair of electrodes with each other. The surface area of the surface area-enlarged magnetic path is set to be the largest among the plurality of paths.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] FIELD An embodiment of the present invention relates to an electromagnetic operation mechanism. [Background technology]

[0002] Switchgears equipped with switches such as circuit breakers and disconnectors are known as switching devices for receiving and distributing electricity installed in buildings and large facilities. Vacuum valves are used as components of the switches in switchgears, and the vacuum valves interrupt fault currents and open and close load currents, thereby ensuring a stable supply of power from the switchgear.

[0003] A vacuum interrupter has a pair of electrodes that can be connected or disconnected, and these electrodes are connected or disconnected (opened or closed) by an electromagnetic operating mechanism. The electromagnetic operating mechanism is configured with, for example, an open-circuit coil, a closed-circuit coil, a permanent magnet, an armature, etc., inside a yoke. The yoke and armature are made of a material (e.g., iron or electromagnetic steel sheet) with a higher magnetic permeability than air. With this configuration, current is passed through the coil to generate a magnetic flux, and the resulting magnetic force connects or disconnects (opens or closes) the pair of electrodes.

[0004] For example, to close an open electrode, current is passed through the closing coil to generate a magnetic flux in the same direction as the permanent magnet, displacing the armature in a direction that brings the electrodes into contact. When the armature and yoke come into contact with each other against the biasing force of the opening spring, current is stopped from passing through the closing coil. At this time, the magnetic flux of the permanent magnet forms a closed loop through the armature and yoke. This generates a magnetic force between the armature and yoke in a direction that attracts the armature to the yoke. As a result, the armature and yoke are maintained in close contact with each other. Thus, the pair of electrodes are maintained in a closed state in which they are in contact with each other.

[0005] On the other hand, to open the closed electrodes, current is passed through the opening coil to generate magnetic flux in the opposite direction to the permanent magnet, displacing the armature in a direction that separates the electrodes. At this time, the magnetic force of the permanent magnet in the direction that attracts the armature to the yoke decreases. When this magnetic force falls below the biasing force of the opening spring, the armature is separated from the yoke by the biasing force of the opening spring. Thus, the pair of electrodes are maintained in an open-circuit state, separated from each other. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2019-029222 [Patent Document 2] Japanese Patent Application Publication No. 2019-102124 Summary of the Invention [Problem to be solved by the invention]

[0007] Incidentally, when the pair of electrodes are connected or disconnected (opened or closed) (i.e., during a magnetic flux fluctuation state in which the magnetic flux fluctuates due to the application of current to the open-circuit coil or the closed-circuit coil), the magnetic flux generated from the coil penetrates only the surfaces of the armature and the yoke due to the skin effect, and does not penetrate the interior of the armature or the yoke.

[0008] In contrast, when the pair of electrodes come into contact with each other (i.e., when the magnetic flux is stable and does not fluctuate due to the current being cut off to the open-circuit coil or the closed-circuit coil), the magnetic flux generated by the permanent magnet passes through the armature and the yoke.

[0009] Here, a magnetic path with a large surface area is effective for efficiently transmitting magnetic flux generated during a magnetic flux fluctuation state (i.e., fluctuating magnetic flux), and a magnetic path with a large cross-sectional area is effective for efficiently transmitting magnetic flux generated during a magnetic flux stability state (i.e., stable magnetic flux that does not fluctuate).

[0010] However, if a magnetic path with a large surface area is configured for one or both of the armature and the yoke, the electromagnetic operating mechanism will become correspondingly larger, and if a magnetic path with a large cross-sectional area is configured, the electromagnetic operating mechanism will become correspondingly heavier.

[0011] In this case, if one or both of the armature and the yoke are to be made smaller and lighter while also having a larger surface area, it becomes difficult to maintain a constant mechanical strength of the electromagnetic operating mechanism. To maintain a constant mechanical strength, the cross-sectional area of ​​the magnetic path must be increased, but this inevitably increases the weight of the electromagnetic operating mechanism.

[0012] An object of the present invention is to provide a small, lightweight electromagnetic operating mechanism that combines a magnetic path with a large surface area that allows magnetic flux to pass efficiently when the magnetic flux is fluctuating, and a magnetic path with a large cross-sectional area that allows magnetic flux to pass efficiently when the magnetic flux is stable, while maintaining constant mechanical strength. [Means for solving the problem]

[0013] According to an embodiment, there is provided a plurality of magnetic paths that separate a pair of electrodes by transmitting magnetic flux therethrough, a yoke and an armature that separate the pair of electrodes, and a coil supported by the yoke, wherein the plurality of magnetic paths include an enlarged-surface-area magnetic path whose surface area is enlarged so that magnetic flux that fluctuates when the pair of electrodes are separated from each other can pass through, and the surface area of ​​the enlarged-surface-area magnetic path is set to be the largest among the plurality of magnetic paths, and the plurality of magnetic paths include an enlarged-cross-sectional-area magnetic path that enlarges the overall cross-sectional area of ​​the plurality of magnetic paths so that magnetic flux that is stable when the pair of electrodes contact each other can pass through, and the enlarged-surface-area magnetic path and the enlarged-cross-sectional-area magnetic path are provided in one or both of the yoke and the armature, and in the yoke, the enlarged-cross-sectional-area magnetic path is arranged outside the enlarged-surface-area magnetic path, The surface area enlarged magnetic path is integrally and continuously arranged along a direction surrounding the entire coil and armature. . [Brief explanation of the drawings]

[0014] [Figure 1]FIG. 2 is a cross-sectional view showing the internal configuration of the electromagnetic operation mechanism according to the embodiment in an open state. [Figure 2] 2 is a cross-sectional view showing the electromagnetic operation mechanism shown in FIG. 1 in a closed state. [Figure 3] FIG. 2 is a cross-sectional view taken along line F3-F3 in FIG. 1. [Figure 4] FIG. 10 is a cross-sectional view showing the internal configuration of an electromagnetic operation mechanism according to a modified example. [Figure 5] FIG. 5 is a cross-sectional view taken along line F5-F5 in FIG. 4. DETAILED DESCRIPTION OF THE INVENTION

[0015] "One embodiment" 1 and 2 show an electromagnetic operating mechanism 3 that opens and closes a vacuum valve 2 applied to a switchgear switch 1 (e.g., a circuit breaker or disconnector), with FIG. 1 being an open-circuit state diagram and FIG. 2 being a closed-circuit state diagram. In the example of FIGS. 1 and 2, the switchgear 1 has a vacuum valve 2, a coupling mechanism 4, and an electromagnetic operating mechanism 3. The vacuum valve 2 and the electromagnetic operating mechanism 3 are interconnected by the coupling mechanism 4.

[0016] 1 and 2, the vacuum interrupter 2 has a pair of detachable electrodes (a fixed electrode 5a and a movable electrode 5b) and an insulating container 6 that houses these electrodes 5a and 5b. The pair of electrodes 5a and 5b are made of a conductive material such as copper, aluminum, or chromium. The insulating container 6 is made of an insulating material (e.g., ceramic) and has a cylindrical shape.

[0017] The fixed electrode 5a is connected to a fixed current-carrying shaft 7a fixed to the switch 1. The movable electrode 5b is connected to a movable current-carrying shaft 7b so as to face the fixed electrode 5a. The fixed current-carrying shaft 7a and the movable current-carrying shaft 7b are made of a conductive material such as copper, aluminum, or chromium. The movable current-carrying shaft 7b is connected to the connecting mechanism 4 (a support shaft 11 described below).

[0018] The connecting mechanism 4 includes a folder 8 , a wipe spring 9 , a support 10 , a support shaft 11 , a circuit-breaking spring 12 , and a connecting shaft 13 .

[0019] A storage section 8p is provided within the folder 8, and this storage section 8p stores a wipe spring 9 and a support body 10. The wipe spring 9 is formed, for example, of a compression coil spring, and one end thereof is fixed to the storage section 8p and the other end is fixed to the support body 10.

[0020] The biasing force of the wipe spring 9 always acts on the support 10, maintaining it in elastic contact with the flange portion 8f of the folder 8. A support shaft 11 extending along the biasing direction of the wipe spring 9 is connected to the support 10, and the extending end of the support shaft 11 is connected to the movable current-carrying shaft 7b described above.

[0021] A connecting shaft 13 is connected to the folder 8 on the side opposite to the flange portion 8f, and the connecting shaft 13 is connected to the electromagnetic operation mechanism 3 (an operation shaft 16 described later). The connecting shaft 13 is provided with a base portion 13p that supports the circuit-breaking spring 12 (e.g., a compression coil spring). This allows the biasing force of the circuit-breaking spring 12 to be applied to the electromagnetic operation mechanism 3 (an operation shaft 16 described later) from the base portion 13p via the connecting shaft 13, for example, when opening a closed electrode.

[0022] The electromagnetic operating mechanism 3 has a yoke 14, an armature 15, an operating shaft 16, a permanent magnet 17, and coils (closed coil 18a, open coil 18b). The yoke 14 and the armature 15 are made of a material (e.g., soft iron, iron, or electromagnetic steel sheet) having a higher magnetic permeability than air.

[0023] 1 and 2, the permanent magnet 17, the make-circuit coil 18a, and the break-circuit coil 18b are supported by a yoke 14. A single operating shaft 16 extending straight is inserted through the yoke 14 so as to be able to reciprocate. The permanent magnet 17 is arranged to surround the operating shaft 16, and the make-circuit coil 18a and the break-circuit coil 18b are arranged to surround the permanent magnet 17. The make-circuit coil 18a and the break-circuit coil 18b are arranged to be aligned with each other along the reciprocating direction of the operating shaft 16.

[0024] The connecting shaft 13 of the connecting mechanism 4 is connected to one end of the operating shaft 16, and the armature 15 is connected to the other end of the operating shaft 16. The armature 15 has a journal portion 15p and a flange portion 15f. The journal portion 15p firmly supports the operating shaft 16. The flange portion 15f protrudes, for example, radially from the journal portion 15p in a direction perpendicular to the operating shaft 16. The movement range of the armature 15 to which the operating shaft 16 is connected is restricted by a stopper (not shown) to prevent it from falling off the yoke 14.

[0025] 1 and 2, when the armature 15 is reciprocated, the reciprocating motion is transmitted from the operating shaft 16 via the connecting shaft 13 to the connecting mechanism 4, causing the connecting mechanism 4 to reciprocate. This causes the movable current-carrying shaft 7b connected to the support body 10 (support shaft 11) to operate. As a result, the movable electrode 5b can be moved toward and away from the fixed electrode 5a (opened and closed).

[0026] For example, to close the open electrodes 5a, 5b, current is passed through the closing coil 18a to generate a magnetic flux in the same direction as the permanent magnet 17, displacing the armature 15 in a direction that brings the electrodes 5a, 5b into contact with each other. When the armature 15 and the yoke 14 come into contact with each other against the biasing force of the opening spring 12, current is stopped from passing through the closing coil 18a.

[0027] At this time, the magnetic flux of the permanent magnet 17 forms a closed loop via the armature 15 and the yoke 14. This generates a magnetic force between the armature 15 and the yoke 14 in a direction that attracts the armature 15 to the yoke 14. As a result, the armature 15 and the yoke 14 are maintained in close contact with each other. Thus, the pair of electrodes 5a, 5b are maintained in a closed state in which they are in contact with each other (see FIG. 2).

[0028] On the other hand, when the closed electrodes 5a, 5b are to be opened, current is passed through the open-circuit coil 18b to generate a magnetic flux in the opposite direction to that of the permanent magnet 17, displacing the armature 15 in a direction that separates the electrodes 5a, 5b. At this time, the magnetic force of the permanent magnet 17 in the direction that attracts the armature 15 to the yoke 14 decreases.

[0029] When the magnetic force at this time falls below the biasing force of the circuit-breaking spring 12, the biasing force of the circuit-breaking spring 12 separates the armature 15 from the yoke 14. Thus, the pair of electrodes 5a, 5b are maintained in an open-circuit state in which they are spaced apart from each other (see FIG. 1).

[0030] The electromagnetic operating mechanism 3 (yoke 14, armature 15) described above has multiple magnetic paths, although no particular reference numerals are given to these paths, and the pair of electrodes 5a, 5b are connected and disconnected (opened and closed) by passing magnetic flux through these magnetic paths.

[0031] In this case, when the pair of electrodes 5a, 5b are connected to or separated from each other (opened or closed), current is passed through each of the coils 18a, 18b, and the magnetic flux generated from the coils 18a, 18b passes through only the surfaces of the yoke 14 and the armature 15 in a fluctuating state. A magnetic path with a large surface area is effective for efficiently passing the magnetic flux during such a fluctuating state.

[0032] Furthermore, when the pair of electrodes come into contact with each other, the current to each of the coils 18a, 18b is stopped, and the magnetic flux generated from the permanent magnet 17 passes through the inside of the yoke 14 and the armature 15 in a stable state without fluctuating. A magnetic path with a large cross-sectional area is effective for efficiently passing the magnetic flux in such a stable state.

[0033] Therefore, the electromagnetic operation mechanism 3 is provided with a magnetic path with a large surface area and a magnetic path with a large cross-sectional area. The magnetic path with a large surface area is configured to include an enlarged surface area magnetic path so that the magnetic flux (i.e., the magnetic flux from the coils 18a and 18b) that fluctuates when the pair of electrodes 5a and 5b are brought into contact with each other (opened and closed) can pass through. Furthermore, the magnetic path with a large cross-sectional area is configured to include an enlarged cross-sectional area magnetic path that enlarges the overall cross-sectional area of ​​the multiple magnetic paths so that the magnetic flux (i.e., the magnetic flux from the permanent magnet 17) that stabilizes when the pair of electrodes 5a and 5b are in contact with each other can pass through.

[0034] The surface area-enlarged magnetic path and the cross-sectional area-enlarged magnetic path can be provided in one or both of the yoke 14 and the armature 15. In the example of FIGS. 1 and 2, both the surface area-enlarged magnetic path and the cross-sectional area-enlarged magnetic path are provided in the yoke 14.

[0035] The yoke 14 is provided with a hollow enlarged-surface-area yoke 14a as a surface-area-enlarged magnetic path, and a solid enlarged-cross-sectional-area yoke 14b as a cross-sectional-area-enlarged magnetic path. The enlarged-surface-area yoke 14a and the enlarged-cross-sectional-area yoke 14b are arranged parallel to each other. The enlarged-surface-area yoke 14a and the enlarged-cross-sectional-area yoke 14b may be molded integrally with the yoke 14, or may be molded separately and attached to the yoke 14 later.

[0036] The surface area enlarged yoke 14a is disposed so as to surround the region from the closed-circuit coil 18a and the open-circuit coil 18b to the armature 15. The surface area of ​​the surface area enlarged magnetic path 14a is set to be the largest among the multiple magnetic paths including the yoke 14 and the armature 15.

[0037] The surface area-enlarging yoke 14a may be formed, for example, as a single member formed into a hollow cylindrical shape, or may be formed as a laminated member formed by rolling thin plates into a hollow shape. The laminated structure increases the surface area.

[0038] With this type of surface-area enlarged yoke 14a, when the pair of electrodes 5a, 5b are brought into contact with or separated from each other (opened or closed), the magnetic resistance of the surface 14s of the surface-area enlarged yoke 14a is the lowest in the electromagnetic operating mechanism 3 (yoke 14, armature 15). This allows the magnetic flux (magnetic flux from the coils 18a, 18b) that fluctuates when the pair of electrodes 5a, 5b are brought into contact with or separated from each other (opened or closed) to easily pass through the surface 14s of the surface-area enlarged yoke 14a.

[0039] Furthermore, the cross-sectional area enlarged yoke 14b is disposed outside the surface area enlarged yoke 14a. The cross-sectional area enlarged yoke 14b is provided at a plurality of locations so as to surround the surface area enlarged yoke 14a.

[0040] Fig. 3 is a diagram showing the arrangement of the cross-sectional area enlarged yoke 14b. In the example of Fig. 3, the surface area enlarged yoke 14a has a hollow cylindrical shape concentric with the operating shaft 16. The cross-sectional area enlarged yoke 14b has a solid cylindrical shape and is concentrically arranged at four locations on the outside of the surface area enlarged yoke 14a.

[0041] Here, the cross-sectional area enlarged yoke 14b may have various shapes other than a cylinder, such as a square prism, a triangular prism, etc. Furthermore, the number of cross-sectional area enlarged yokes 14b arranged may be set to, for example, three or five or more places instead of four.

[0042] With such a solid structure of the enlarged cross-sectional area yoke 14b, the thickness of the enlarged cross-sectional area yoke 14b can be adjusted depending on, for example, the size and application of the electromagnetic operating mechanism 3. This ensures the desired mechanical strength of the electromagnetic operating mechanism 3. In addition, the magnetic flux (magnetic flux from the permanent magnet 17) that stabilizes when the pair of electrodes 5a, 5b come into contact with each other can easily pass through the entire yoke 14, including the enlarged cross-sectional area yoke 14b and the enlarged surface area yoke 14a.

[0043] As described above, according to this embodiment, by combining the hollow enlarged-surface-area yoke 14a and the solid enlarged-cross-sectional-area yoke 14b, a small and lightweight electromagnetic operating mechanism can be realized that efficiently transmits magnetic flux in both a fluctuating and a stable magnetic flux state while maintaining a constant mechanical strength of the electromagnetic operating mechanism 3 using the enlarged-cross-sectional-area yoke 14b. This allows the fluctuating magnetic flux that occurs when the pair of electrodes 5a, 5b are opened and closed to efficiently pass through the surface 14s of the enlarged-surface-area yoke 14a, which has low electrical resistance. Furthermore, the magnetic flux that stabilizes when the pair of electrodes 5a, 5b are in contact with each other can efficiently pass through the entire interior of the yoke 14, which has low electrical resistance due to the increased cross-sectional area of ​​the entire yoke 14 provided with the enlarged-cross-sectional-area yoke 14b.

[0044] According to this embodiment, the surface area enlarged yoke 14a is disposed so as to surround the area from the closed-circuit coil 18a and the open-circuit coil 18b to the armature 15. As a result, the magnetic flux generated from the permanent magnet 17 is blocked by the surface area enlarged yoke 14a, thereby preventing leakage of the magnetic flux to the surroundings.

[0045] According to this embodiment, the cross-sectional area enlarged yoke 14b ensures the mechanical strength of the electromagnetic operation mechanism 3. In this case, the surface area enlarged yoke 14a can be made as large as possible without increasing the size of the electromagnetic operation mechanism 3 (or without increasing the size of the current size). This makes it possible to widen the surface 14s with low magnetic resistance, thereby enabling more efficient transmission of magnetic flux that fluctuates when the pair of electrodes 5a, 5b are brought into contact with or separated from each other (opened and closed).

[0046] "Variations" Fig. 4 is a diagram showing the internal configuration of an electromagnetic operation mechanism 3 according to this modified example, and Fig. 5 is a cross-sectional view taken along line F5-F5 in Fig. 4. In this modified example, both the surface area-enlarged magnetic path and the cross-sectional area-enlarged magnetic path are provided in both the yoke 14 and the armature 15. Note that the configurations of the surface area-enlarged magnetic path and the cross-sectional area-enlarged magnetic path in the yoke 14 are the same as those described in the above embodiment, so the surface area-enlarged magnetic path and the cross-sectional area-enlarged magnetic path in the armature 15 will be described below.

[0047] A hollow-structured expanded-surface armature 15a is provided adjacent to the armature 15 as a surface-area-enlarged magnetic path, and a hollow-structured expanded-cross-sectional area armature 15b is provided adjacent to the armature 15 as a cross-sectional area-enlarged magnetic path. The expanded-surface armature 15a and the expanded-cross-sectional area armature 15b are arranged parallel to each other.

[0048] The cross-sectional area enlarged armature 15b is disposed adjacent to the inside of the surface area enlarged armature 15a. With this arrangement, the armature 15 including the above-described bearing portion 15p and flange portion 15f is formed.

[0049] In this configuration, when focusing on the surface-area-enlarged armature 15a, the magnetic resistance of its surface 15s is lowest when the pair of electrodes 5a, 5b are being brought into contact with or separated from each other (opened or closed), which allows the magnetic flux (magnetic flux from the coils 18a, 18b) that fluctuates when the pair of electrodes 5a, 5b are being brought into contact with or separated from each other (opened or closed) to easily pass through the surface 14s of the surface-area-enlarged yoke 14a.

[0050] Furthermore, the cross-sectional area expanded armature 15b has a hollow cylindrical shape concentric with the operating shaft 16. The thickness of the cross-sectional area expanded armature 15b can be adjusted depending on, for example, the size and application of the electromagnetic operation mechanism 3. This ensures the desired mechanical strength of the electromagnetic operation mechanism 3. In addition, the magnetic flux (magnetic flux from the permanent magnet 17) that stabilizes when the pair of electrodes 5a, 5b come into contact with each other can easily pass through the entire armature 15, which includes the cross-sectional area expanded armature 15b and the surface area expanded armature 15a.

[0051] According to this modification, by providing both the yoke 14 and the armature 15 with a surface-area-enlarged magnetic path (surface-area-enlarged yoke 14a, surface-area-enlarged armature 15a) and a cross-sectional area-enlarged magnetic path (cross-sectional area-enlarged yoke 14b, cross-sectional area-enlarged armature 15b), it is possible to dramatically improve the permeability of magnetic flux during both a magnetic flux fluctuating state and a magnetic flux stable state.

[0052] "Other Variations" The surface area enlarged magnetic path (surface area enlarged yoke 14a, surface area enlarged armature 15a) and the cross-sectional area enlarged magnetic path (cross-sectional area enlarged yoke 14b, cross-sectional area enlarged armature 15b) may be made of the same material or different materials.

[0053] For example, both the surface area enlarged magnetic paths 14a, 15a and the cross-sectional area enlarged magnetic paths 14b, 15b are made of the same material as the yoke 14 and the armature 15 (for example, soft iron, iron, or electromagnetic steel sheet). For example, one of the surface area-enlarged magnetic paths 14a, 15a and the cross-sectional area-enlarged magnetic paths 14b, 15b is made of the same material as the yoke 14 and the armature 15 (e.g., soft iron, iron, or electromagnetic steel plate), and the other of the surface area-enlarged magnetic paths 14a, 15a and the cross-sectional area-enlarged magnetic paths 14b, 15b is made of a material obtained by solidifying powder of a magnetic material such as ferrite.

[0054] Although one embodiment of the present invention and several modifications thereof have been described above, these embodiments and modifications are presented as examples and are not intended to limit the scope of the invention. These embodiments and modifications may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. These embodiments and modifications are included within the scope and spirit of the invention, and are also included in the inventions and their equivalents as defined in the claims. [Explanation of symbols]

[0055] 1...switch, 2...vacuum pipe, 3...electromagnetic operating mechanism, 4...connecting mechanism, 5a...fixed electrode, 5b...movable electrode, 6...insulating container, 7a...fixed current-carrying shaft, 7b...movable current-carrying shaft, 8...folder, 9...wipe spring, 10...support, 11...support shaft, 12...opening spring, 13...connecting shaft, 13p...base portion, 14...yoke, 14a...surface area enlarged yoke, 14b...cross-sectional area enlarged yoke, 14s...surface, 15...armature, 15a...surface area enlarged armature, 15b...cross-sectional area enlarged armature, 15s...surface, 16...operating shaft, 17...permanent magnet, 18a...making coil, 18b...opening coil.

Claims

1. a plurality of magnetic paths that separate and contact the pair of electrodes by transmitting magnetic flux; a yoke and an armature that separate the pair of electrodes; a coil supported by the yoke, the plurality of magnetic paths are configured to include surface area enlarged magnetic paths whose surface areas are enlarged so that the magnetic flux that fluctuates when the pair of electrodes is brought into contact with or separated from each other can pass through; The surface area of ​​the surface-area-enlarged magnetic path is set to be the largest among the plurality of magnetic paths, The plurality of magnetic paths are configured to include a cross-sectional area enlarging magnetic path that enlarges the overall cross-sectional area of ​​the plurality of magnetic paths so that the magnetic flux that is stabilized when the pair of electrodes contact each other can pass through, and the surface area-enlarged magnetic path and the cross-sectional area-enlarged magnetic path are provided in one or both of the yoke and the armature, In the yoke, the cross-sectional area enlarged magnetic path is disposed outside the surface area enlarged magnetic path, an electromagnetic operating mechanism in which the surface area enlarged magnetic path is integrally and continuously disposed along a direction surrounding the entire coil and the armature;

2. 2. The electromagnetic operation mechanism according to claim 1, wherein the magnetic flux that fluctuates when the pair of electrodes is moved toward or away from each other passes through the surface of the surface area enlarged magnetic path.

3. 3. The electromagnetic operating mechanism according to claim 2, wherein when the pair of electrodes are in contact with or separated from each other, the magnetic resistance of the surface of the surface area enlarged magnetic path is the lowest in the electromagnetic operating mechanism.

4. 2. The electromagnetic operating mechanism according to claim 1, wherein the magnetic flux that is stabilized when the pair of electrodes contact each other passes through all of the plurality of magnetic paths including the enlarged cross-sectional area magnetic path.

5. 2. The electromagnetic operating mechanism according to claim 1, wherein the surface area-enlarged magnetic path and the cross-sectional area-enlarged magnetic path are arranged parallel to each other.

6. The surface area enlarged magnetic path has a hollow structure, 2. The electromagnetic operating mechanism according to claim 1, wherein the cross-sectional area enlarged magnetic path has a solid structure and is provided at a plurality of locations so as to surround the surface area enlarged magnetic path.

7. 6. The electromagnetic operating mechanism according to claim 5, wherein in the armature, the cross-sectional area enlarged magnetic path is disposed inside the surface area enlarged magnetic path.

8. the surface area-enlarged magnetic path and the cross-sectional area-enlarged magnetic path each have a hollow structure; 8. The electromagnetic operating mechanism according to claim 7, wherein the cross-sectional area enlarged magnetic path is provided adjacent to the inside of the surface area enlarged magnetic path.

9. 6. The electromagnetic operating mechanism according to claim 5, wherein the surface area enlarged magnetic path and the cross-sectional area enlarged magnetic path are made of the same material or different materials.

Images