WO2021199296A1

WO2021199296A1 - Electromagnetic actuator and circuit breaker using same electromagnetic actuator

Info

Publication number: WO2021199296A1
Application number: PCT/JP2020/014854
Authority: WO
Inventors: 康宏神納; 翔田中
Original assignee: 三菱電機株式会社
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2021-10-07
Also published as: EP4131295A1; JP7361889B2; JPWO2021199296A1; EP4131295A4

Abstract

Provided is an electromagnetic actuator that can maintain the wipe amount when a circuit breaker is closed.　This electromagnetic actuator comprises: a cylindrical coil 1 that generates a magnetic flux in the axial direction by being energized; a moving core 2 that is installed in a state of being able to move back and forth in the axial direction of the coil 1; a shaft 8 that is surrounded by the moving core 2, that performs an opening/closing operation between contact points of the circuit breaker, and that can move together with the moving core 2; a cylindrical yoke pipe 4 that surrounds the coil 1; a fixed-side lid plate 5 and a moving-side lid plate 6 that are disposed, respectively, on both ends of the yoke pipe 4 in the axial direction; a fixed core 3 that is disposed on the inner peripheral side of the coil 1 on the side of the fixed-side lid plate 5; and a yoke protrusion 7 that is disposed on the inner peripheral side of the coil 1 on the side of the moving-side lid plate 6. When a current flows in the coil 1 to excite the coil, the moving core 2 moves from an initial position towards the fixed core 3 together with the shaft 8, and after the shaft 8 has stopped as a result of contacting a contact point of the circuit breaker, the moving core moves to a position of the shaft 8 abutting the fixed core 3.

Description

Electromagnetic actuator and circuit breaker using this electromagnetic actuator

The present disclosure relates to an electromagnetic actuator used for a circuit breaker or the like capable of interrupting an electric circuit, and a circuit breaker using this electromagnetic actuator.

Generally, in a circuit breaker, an electromagnetic actuator is used to operate the contact opening / closing operation. In the electromagnetic actuator, when a current flows through the coil, the magnetic circuit is excited, the movable iron core in the electromagnetic actuator is driven in the direction of the fixed iron core, and the shaft connected to the movable iron core moves together with the movable iron core to move the circuit breaker. The closed pole operation of the contact is operated.
As a technique relating to a conventional electromagnetic actuator, for example, there is one described in a patent document. In the electromagnetic actuator according to Patent Document 1, the shaft, which is an operating shaft for operating the closing operation of the contact of the circuit breaker, is firmly tightened and fixed to the movable iron core by a set screw for preventing loosening. As a result, when the coil is energized, it moves together with the shaft and the movable iron core.
In addition to such a conventional electromagnetic actuator, the circuit breaker that constantly holds the closed state of the contact has a fixed contact in which the movable contact, which is one contact at the time of closing, is relatively the other contact. It is equipped with a pushing mechanism that gives contact pressure to. As a result, the wipe amount, which is the pressing amount of the contact pressure applied to the contacts, is maintained, and the contacts are in a stable contact state when the pole is closed.

Japanese Patent Application Laid-Open No. 9-199320

However, although the circuit breaker is required to be miniaturized, there is a problem that the size of the circuit breaker becomes large if a mechanism for maintaining the wipe amount between the contacts at the time of closing the pole is provided separately from the electromagnetic actuator.
This disclosure has been made in order to solve the above-mentioned problems, and it is necessary to provide an electromagnetic actuator capable of maintaining the wipe amount when the circuit breaker is closed, and a mechanism for maintaining the wipe amount separately from the electromagnetic actuator. This is to obtain a circuit breaker that can improve miniaturization.

The electromagnetic actuator according to the present disclosure is surrounded by a tubular coil that generates an axial magnetic flux when an electric current flows, a movable iron core that is installed in a state where it can reciprocate in the axial direction of the coil, and a movable iron core. A shaft that opens and closes between the movable side contact and the fixed side contact of the breaker and can move with the movable iron core, a tubular yoke pipe that surrounds the coil, and one end of the yoke pipe in the axial direction of the coil. The fixed side lid plate arranged in the coil, the movable side lid plate arranged at the other end of the yoke pipe in the axial direction of the coil, and the direction from the fixed side lid plate to the movable side lid plate on the inner peripheral side of the coil. The movable iron core is provided with a fixed iron core arranged in the coil and a tubular yoke projecting portion protruding from the movable side lid plate toward the fixed side lid plate so as to face the fixed iron core on the inner peripheral side of the coil. , It is arranged in the space on the inner peripheral side of the yoke protrusion, and when it is excited by the flow of current through the coil, it moves from the initial position together with the shaft in the axial direction of the coil toward the fixed iron core, and is on the movable side. After the movement of the shaft is stopped by contacting the contact with the fixed side contact, the shaft is moved to a position where it comes into contact with the fixed iron core in the excited operation completed state.
The circuit breaker according to the present disclosure is characterized in that the electromagnetic actuator according to the present disclosure is used to operate the opening / closing operation between the movable side contact and the fixed side contact.

According to the electromagnetic actuator according to the present disclosure, after the movement of the shaft is stopped by bringing the movable side contact and the fixed side contact into contact with each other, the movable iron core can move to the fixed core with respect to the shaft, and the operation operation of the electromagnetic actuator itself is performed. Therefore, the wipe amount when the circuit breaker is closed can be maintained.
According to the circuit breaker using the electromagnetic actuator according to the present disclosure, it is not necessary to provide a mechanism for maintaining the wipe amount separately from the electromagnetic actuator, so that the circuit breaker can be miniaturized.

It is a schematic diagram which shows the open state of the contact of the circuit breaker using the electromagnetic actuator which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the closed pole state of the contact of the circuit breaker using the electromagnetic actuator which concerns on Embodiment 1. FIG. It is schematic cross-sectional view which shows the demagnetized state of the electromagnetic actuator which concerns on Embodiment 1. FIG. It is schematic cross-sectional view which shows the excitation operation completion state of the electromagnetic actuator which concerns on Embodiment 1. FIG. It is a figure which shows the magnetic circuit at the initial position of the movable iron core of the electromagnetic actuator which concerns on Embodiment 1. FIG. It is schematic cross-sectional view which shows the demagnetized state of the electromagnetic actuator which concerns on Embodiment 2. FIG. It is schematic cross-sectional view which shows the excitation operation completion state of the electromagnetic actuator which concerns on Embodiment 2. FIG. It is a figure which shows the magnetic circuit at the initial position of the movable iron core of the electromagnetic actuator which concerns on Embodiment 2. FIG. It is schematic cross-sectional view which shows the demagnetized state of the electromagnetic actuator which concerns on Embodiment 3. FIG. It is schematic cross-sectional view which shows the excitation operation completion state of the electromagnetic actuator which concerns on Embodiment 3. FIG.

Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings. In each of the following embodiments, the same reference numerals are given to the same components.

Embodiment 1.
1 and 2 are schematic views showing a circuit breaker 110 using the electromagnetic actuator according to the first embodiment. FIG. 1 is a diagram showing a state in which the contacts of the circuit breaker 110 are open, and FIG. 2 is a diagram showing a state in which the contacts of the circuit breaker 110 are closed.
The circuit breaker 110 according to the first embodiment is a circuit breaker that constantly holds the closed state of the contacts by energizing the coil of the electromagnetic actuator. As shown in FIGS. 1 and 2, the circuit breaker 110 includes a pair of movable side contacts 104 and fixed side contacts 105, and an electromagnetic actuator 100 provided with a shaft 8 for operating contact opening / closing operation. It has an arc extinguishing chamber 108.

A movable conductor 103, a flexible conductor 106, a lower conductor 101, and an open pole spring 107 are provided on the movable side contact 104 side. An upper conductor 102 is provided on the fixed side contact 105 side.
The arc extinguishing chamber 108 extinguishes the arc discharge generated when the movable side contact 104 separates from the fixed side contact 105 during the opening operation.

The fixed-side contact 105, which is one of the pair of contacts, is joined to one end of the upper conductor 102 and is electrically connected to the upper conductor 102.
The movable side contact 104, which is the other of the pair of contacts, is joined to one end of the movable conductor 103 at a position facing the fixed side contact 105. The other end of the movable conductor 103 is connected to the lower conductor 101 by a flexible conductor 106. The movable side contact 104 is electrically connected to the lower conductor 101 via the movable conductor 103 and the flexible conductor 106.
The flexible conductor 106 is urged on the shaft 8 of the electromagnetic actuator 100 so as to open and close the movable side contact 104 and the fixed side contact 105.
The lower conductor 101, the upper conductor 102, the movable conductor 103, the movable side contact 104, the fixed side contact 105, and the flexible conductor 106 are composed of conductors.

The movable side contact 104 and the fixed side contact 105 are energized via the lower conductor 101 and the upper conductor 102, respectively. The movable side contact 104 is connected to the fixed side contact 105 by moving the movable conductor 103 toward the upper conductor 102. Further, the movable side contact 104 is disconnected from the fixed side contact 105 by moving the movable conductor 103 in the direction away from the upper conductor 102.
The state in which the movable side contact 104 and the fixed side contact 105 are connected is the state in which the contact is closed, and the state in which the movable side contact 104 and the fixed side contact 105 are separated is the state in which the contact is open.

In the circuit breaker 110, the movable side contact 104 and the fixed side contact 105 are connected by the exciting operation of the electromagnetic actuator 100, and the contact is in a closed state as shown in FIG. In this case, the lower conductor 101 and the upper conductor 102 are energized via the movable side contact 104 and the fixed side contact 105.
Further, in the circuit breaker 110, the movable side contact 104 and the fixed side contact 105 are separated from each other by the demagnetizing operation of the electromagnetic actuator 100, and the contacts shown in FIG. 1 are opened. In this case, the energization of the lower conductor 101 and the upper conductor 102 is stopped.

The open pole spring 107 is connected to the movable conductor 103, and is provided so as to open the contact on the movable side contact 104 side of the movable conductor 103. The open pole spring 107 elastically stores the movable side contact 104 so as to separate it from the fixed side contact 105. The contact opening and closing operations, which are the contact opening and closing operations, are performed by the operation of the electromagnetic actuator 100. When driving the closing pole of the contact, the electromagnetic actuator 100 pushes the contact against the accumulating force of the opening spring 107.

The shaft 8 is arranged so as to pass through the axis center of the electromagnetic actuator 100. The movable conductor 103 is connected to the electromagnetic actuator 100 via the shaft 8. The electromagnetic actuator 100 operates an opening / closing operation between the contacts of the circuit breaker 110. The electromagnetic actuator 100 moves the movable conductor 103 via the shaft 8 to control the connection between the movable side contact 104 and the fixed side contact 105.

Next, the configuration of the electromagnetic actuator 100 shown in FIGS. 3 and 4 will be described.
FIG. 3 is a cross-sectional view showing a demagnetized state of the electromagnetic actuator 100 according to the first embodiment, corresponding to the open pole state of the circuit breaker 110 shown in FIG. In the demagnetized state of the electromagnetic actuator 100 shown in FIG. 3, the movable iron core 2 is located at the initial position.
FIG. 4 is a cross-sectional view showing a completed state of the excitation operation of the electromagnetic actuator 100 according to the first embodiment, corresponding to the closed pole state of the circuit breaker 110 shown in FIG. In the excited operation completed state of the electromagnetic actuator 100 shown in FIG. 4, the movable iron core 2 is in contact with the fixed core 3.

The electromagnetic actuator 100 has a tubular coil 1 that generates an axial magnetic flux when an electric current flows, and a movable iron core that is arranged in the axial direction of the coil 1 and is installed in a state where it can reciprocate in the axial direction of the coil 1. 2. A shaft 8 surrounded by a movable iron core 2 and movable together with the movable iron core 2, a tubular yoke pipe 4 surrounding the coil 1, and arranged at one end of the yoke pipe 4 in the axial direction of the coil 1. The fixed side lid plate 5 and the movable side lid plate 6 arranged at the other end of the yoke pipe 4 in the axial direction of the coil 1 and the movable side lid plate 5 to the movable side lid plate on the inner peripheral side of the coil 1. A fixed iron core 3 arranged in the direction toward 6 and a tubular yoke protruding from the movable side lid plate 6 toward the fixed side lid plate 5 on the inner peripheral side of the coil 1 so as to face the fixed iron core 3. It has a protruding portion 7.

In the axial direction of the coil 1, the yoke pipe 4 is arranged between the fixed side lid plate 5 and the movable side lid plate 6, and the fixed side lid plate 5 and the movable side lid plate 6 are arranged so as to face each other. ing. The fixed iron core 3 faces the movable iron core 2 surrounded by the yoke projecting portion 7 and the yoke projecting portion 7 in the axial direction of the coil 1.
Each part of the yoke pipe 4, the fixed side lid plate 5, the movable side lid plate 6, the fixed iron core 3, and the yoke projecting portion 7 is a stepped integrated type and is made of a magnetic material. A typical magnetic material is, for example, iron.
Further, in each of the yoke pipe 4, the fixed side lid plate 5, the movable side lid plate 6, the fixed iron core 3, and the yoke protruding portion 7, a magnetic circuit is excited together with the movable iron core 2 by energizing the coil 1.

The coil 1 is housed in a cylindrical space formed in a yoke pipe 4, a fixed side lid plate 5, a movable side lid plate 6, a fixed iron core 3, and a yoke protrusion 7. Further, the coil 1 has a cylindrical shape so as to surround the movable iron core 2, the yoke protrusion 7, and the fixed iron core 3.

The movable iron core 2 is arranged on the inner peripheral side of the yoke protruding portion 7 so as to face the fixed iron core 3, and is installed in a state in which the movable iron core 2 can reciprocate relative to the fixed iron core 3 in the axial direction of the coil 1. .. Specifically, the movable iron core 2 is driven so as to move toward the fixed core 3 in the axial direction of the coil 1 when a current flows through the coil 1. In this case, the movable iron core 2 is in the closed state of the circuit breaker 110 shown in FIG. 4 from the initial position which is the demagnetized state of the electromagnetic actuator 100 holding the open state of the contacts of the circuit breaker 110 shown in FIG. The electromagnetic actuator 100 moves to a position where it abuts on the fixed iron core 3, which is the position where the excitation operation is completed.
Further, the length of the movable iron core 2 in the axial direction of the coil 1 is longer than 1/2 of the length of the yoke pipe 4. In the initial position, the movable iron core end surface 2a of the movable iron core 2 is located on the fixed iron core 3 side from the center position of the coil 1 in the axial direction. As the movable iron core 2 becomes longer, the facing area between the movable iron core 2 and the yoke protrusion 7 in the axial direction becomes larger.
The reluctance of a magnetic circuit is reduced by increasing the magnetic path cross-sectional area corresponding to the facing area. By increasing the facing area between the movable iron core 2 and the yoke protruding portion 7, the attractive force acting on the movable iron core 2 in the excited holding state can be further improved. As a result, the holding force between the main contacts of the circuit breaker 110 in the closed pole state can be improved.

The shaft 8 is surrounded by a movable iron core 2 and is arranged in the axial direction of the coil 1. The shaft 8 is made of a non-magnetic material.
The shaft 8 penetrates the fixed side lid plate 5, the fixed iron core 3, and the movable side lid plate 6 in the axial direction of the coil 1. The shaft 8 has a first shaft end portion 8a which is one end portion penetrating the fixed side lid plate 5, and a second shaft end portion 8b which is the other end portion penetrating the movable side lid plate 6. .. The first shaft end portion 8a extends to the movable conductor 103 and is connected to the movable conductor 103. The second shaft end portion 8b is formed to have a larger outer diameter than the portion inserted into the movable iron core 2 of the shaft 8.
Further, a shaft protrusion 8c and a shaft step portion 8d are formed on the shaft 8. The shaft protrusion 8c faces the fixed iron core 3, and the shaft step portion 8d is adjacent to the shaft protrusion 8c and is located at the end of the movable iron core 2 on the fixed side lid plate 5. The shaft protrusion 8c and the shaft step portion 8d are formed to have a larger outer diameter than the portion inserted into the movable iron core 2 of the shaft 8.

Between the movable iron core 2 and the shaft 8, a first movable iron core bearing 13 and a second movable iron core bearing 14, which are bearings for the movable iron core, are arranged at both ends in the axial direction of the movable iron core 2, respectively. There is.
Specifically, a first movable iron core bearing 13 is provided on the shaft stepped portion 8d of the shaft 8 at the end position of the movable iron core 2 on the fixed side lid plate 5 side. The movable iron core 2 is movably supported by the first movable iron core bearing 13 with respect to the shaft 8. By arranging the first movable iron core bearing 13 on the shaft 8 of the non-magnetic component, it can be configured without cutting the cross-sectional area of the movable iron core 2, and the suction force can be secured.
Further, a second movable iron core bearing 14 is provided at the end position of the movable iron core 2 on the movable side lid plate 6 side. The second movable iron core bearing 14 movably supports the shaft 8 together with the movable iron core 2.

A pressure contact spring 9 is arranged between the movable iron core 2 and the shaft 8. The shaft 8 and the movable iron core 2 are connected to each other via a pressure spring 9. The pressure contact spring 9 is built in the movable iron core 2, and is located between the first movable iron core bearing 13 and the second movable iron core bearing 14 in the axial direction. The electromagnetic actuator 100 will be made compact. By increasing the length of the movable iron core 2, it is possible to increase the length of the pressure contact spring 9.
When the movable core 2 moves with respect to the shaft 8 in the direction of the fixed core 3, the pressure contact spring 9 is crimped and the movable core 2 is stored in the direction of being separated from the fixed core 3.

A return spring 10 is arranged between the shaft protrusion 8c and the fixed iron core 3. The shaft 8 and the fixed iron core 3 are connected to each other via a return spring 10. The return spring 10 has a tubular shape that surrounds the shaft 8 and is surrounded by the fixed iron core 3. When the shaft 8 moves in the direction of the fixed core 3 together with the movable core 2, the return spring 10 is crimped and stored in the direction of separating the contacts of the circuit breaker.

Further, shaft bearings that support the movement of the shaft 8 are arranged on the fixed side lid plate 5 and the movable side lid plate 6 in the axial direction, respectively. Specifically, the first shaft bearing 11 is provided at the center of the fixed side lid plate 5, and the second shaft bearing 12 is provided at the center of the movable side lid plate 6. The first shaft bearing 11 is arranged between the fixed side lid plate 5 and the first shaft end portion 8a of the shaft 8 penetrating the fixed side lid plate 5. The second shaft bearing 12 is arranged between the movable side lid plate 6 and the second shaft end portion 8b of the shaft 8 penetrating the movable side lid plate 6. The shaft 8 can move in the axial direction of the coil 1 while being supported by the first shaft bearing 11 and the second shaft bearing 12.

Next, the structure of the fixed iron core 3 and the positional relationship with the movable iron core 2 in the electromagnetic actuator 100 according to the first embodiment will be described.
The movable core 2 and the fixed core 3 have a cylindrical shape that surrounds the shaft 8. The movable iron core 2 and the fixed iron core 3 have a movable iron core end surface 2a and a fixed iron core end surface 3a that face each other in the axial direction of the coil 1. The movable iron core end surface 2a is an annular surface facing the fixed iron core end surface 3a, and the fixed iron core end surface 3a is an annular surface facing the movable iron core end surface 2a.
At the initial position, the movable iron core end surface 2a and the fixed iron core end surface 3a are arranged at opposite positions with a gap s1 having a predetermined distance. The movable iron core 2 is excited and driven in the axial direction toward the fixed iron core 3, the gap s1 becomes smaller as the movable iron core 2 moves, and when the excitation operation is completed, the movable iron core end surface 2a comes into contact with the fixed iron core end surface 3a. The gap s1 becomes zero.

The fixed iron core end surface 3a is located closer to the fixed side lid plate 5 than the axial center of the coil 1. As shown in FIG. 4, the movable core 2 is excited and driven in the axial direction toward the fixed core 3, and in the excited operation completed state, the movable core end surface 2a of the movable core 2 becomes the fixed core end surface 3a of the fixed core 3. The surface at the time of contact is referred to as the contact surface 16.
The position of the abutting surface 16 is the same as the position of the fixed iron core end surface 3a, and the abutting surface 16 between the movable iron core 2 and the fixed iron core 3 in the excited operation completed state is a movable iron core rather than the axial center of the coil 1. It is located on the moving direction side of 2. That is, it is located on the fixed side lid plate 5 side with respect to the axial center of the coil 1.
As a result, a sufficient distance between the contact surface 16 and the movable iron core end surface 2a at the initial position can be obtained. Further, the length of the movable iron core 2 in the axial direction can be increased, the area facing the yoke protruding portion 7 can be increased, and the suction force can be increased.

Further, as shown in FIG. 3, in the fixed iron core 3, the shaft protrusion 8c and the return spring 10 are accommodated at the axial center of the fixed iron core end surface 3a so as to face the shaft protrusion 8c of the shaft 8. A recessed fixed iron core recess 3b is formed. A fixed iron core step portion 3c is provided on the inner wall surface of the fixed iron core recess 3b and faces the shaft protrusion. In the excited operation completed state shown in FIG. 4, the shaft protrusion 8c is surrounded so as to fit in the fixed iron core recess 3b, and comes into contact with the fixed iron core 3 via the return spring 10.

Next, the structure of the yoke protrusion 7 and the positional relationship between the movable iron core 2 and the fixed iron core 3 in the electromagnetic actuator 100 according to the first embodiment will be described.
In the electromagnetic actuator 100 according to the first embodiment, the yoke protrusion 7 extends from the yoke main protrusion 7a arranged on the movable side lid plate 6 side and the yoke main protrusion 7a toward the fixed side lid plate 5. It has a yoke thin protrusion 7b to be formed. The yoke protruding portion 7 faces the fixed iron core 3, and the yoke thin protruding portion 7b is arranged so as to extend in the direction of the fixed iron core 3. The yoke protrusion tip surface 7c, which is the end surface of the yoke protrusion 7 facing the fixed iron core 3, protrudes from the fixed iron core 3 from the movable iron core end surface 2a at the initial position. A gap g1 having a predetermined distance is provided between the tip surface 7c of the yoke protrusion and the end surface 3a of the fixed iron core at opposite positions. The gap g1 is smaller than the gap s1 between the movable iron core end surface 2a and the fixed iron core end surface 3a at the initial position.

The inner diameter of the yoke main protrusion 7a and the inner diameter of the yoke fine protrusion 7b are the same size, and the outer diameter of the yoke main protrusion 7a is larger than the outer diameter of the yoke fine protrusion 7b. The yoke main protrusion 7a and the yoke fine protrusion 7b may be integrally formed or may be composed of separate parts. Both the yoke main protrusion 7a and the yoke fine protrusion 7b have a yoke protrusion inner wall surface 7d which is an inner wall surface of the yoke protrusion 7. Adjusting the characteristics of the suction force applied to the movable iron core 2 by adjusting the configuration of the yoke protrusion 7 such as the difference in outer diameter between the yoke main protrusion 7a and the yoke fine protrusion 7b and the width of the yoke fine protrusion 7b. Can be done.
In the yoke projecting portion 7, the inner wall surface 7d of the yoke projecting portion faces the outer wall surface 2b of the movable iron core, which is the outer wall surface of the movable iron core 2, so as to surround the movable iron core 2. The yoke projecting portion 7 has a yoke thin projecting portion 7b extending from the yoke main projecting portion 7a, and by increasing the length of the movable iron core 2, the facing area between the movable iron core 2 and the yoke projecting portion 7 becomes large. .. That is, the facing area between the outer wall surface 2b of the movable iron core and the inner wall surface 7d of the yoke projecting portion is increased.

Next, the operation of the electromagnetic actuator 100 will be described.
By energizing the coil 1, a magnetic circuit including a movable iron core 2, a fixed iron core 3, a fixed side lid plate 5, a yoke pipe 4, a movable side lid plate 6, and a yoke protruding portion 7 is excited, and a magnetic attraction force is applied to the movable iron core 2. Works, and the movable core 2 is driven in the direction of the fixed core 3. The movable iron core 2 shown in FIG. 3 is driven from the initial position to the position where the movable iron core 2 in the excitation operation completed state shown in FIG. 4 is in contact with the fixed core 3. The circuit breaker 110 changes from the open pole state shown in FIG. 1 to the closed pole state shown in FIG.

As the movable core 2 moves in the direction toward the fixed core 3, the pressure spring 9 that connects the movable core 2 and the shaft 8 is pressed by the moving movable core 2, and the shaft 8 is pressed together with the movable core 2 on the movable side. It moves from the lid plate 6 side toward the fixed side lid plate 5. The movable conductor 103 connected to the shaft 8 moves to the left of the paper surface in FIG. 1 so as to bring the movable side contact 104 and the fixed side contact 105 into contact with each other. The return spring 10 between the shaft protrusion 8c and the fixed iron core 3 is crimped to store energy. When the movable side contact 104 and the fixed side contact 105 come into contact with each other, the shaft 8 stops. After the movement of the shaft 8 is stopped, the movable iron core 2 is further driven in the direction toward the fixed core 3 with respect to the shaft 8 by the magnetic attraction force. After that, the movable iron core end surface 2a of the movable iron core 2 and the fixed iron core end surface 3a of the fixed iron core 3 come into contact with each other to complete the exciting operation, and the circuit breaker is closed. Twice

After the movement of the shaft 8 is stopped by bringing the movable side contact 104 and the fixed side contact 105 into contact with each other, the movable iron core 2 moves with respect to the shaft 8 and is fixed to the movable side contact 104 via the shaft 8. Further contact pressure is applied to the side contact 105. As a result, the wipe amount at the time of closing can be maintained by the operation operation of the electromagnetic actuator itself.

As shown in FIG. 4, when the movable core 2 is in contact with the fixed core 3 and the excitation operation is completed, the return spring 10 is crimped and the shaft 8 is in contact with the fixed core 3 via the return spring 10. At this time, the shaft protrusion 8c is surrounded so as to fit in the fixed iron core recess 3b, does not completely abut with the fixed iron core step portion 3c in the fixed iron core recess 3b, and has a gap 16a.
Since there is a gap 16a between the shaft protrusion 8c and the fixed iron core step portion 3c, the movable iron core 2 can apply contact pressure between the contacts via the shaft 8.
Further, in the excited operation completed state, the shaft protrusion 8c comes into contact with the fixed iron core step portion 3c via the return spring 10 in a state where the accumulating force of the pressure contact spring 9 remains. Since there is a gap 16a, the accumulating force of the pressure contact spring 9 can be released when the magnetic circuit is demagnetized. In the electromagnetic actuator, an attractive force may act between the movable core and the fixed core due to the influence of the residual magnetic field, and the movable core 2 can be separated from the fixed core 3 by utilizing the accumulating force of the pressure contact spring 9. .. Since the accumulating force of the pressure contact spring 9 can be utilized, the size of the return spring 10 provided on the fixed iron core 3 side can be reduced, and the return spring 10 can be miniaturized.

When the magnetic circuit is demagnetized by stopping the energization of the coil 1, the magnetic attraction force disappears, the pressure spring 9 extends, and the movable iron core 2 moves in the direction opposite to the direction in which the fixed iron core 3 is arranged. The second shaft end 8b is applied to the movable iron core 2, and the shaft 8 moves together with the movable iron core. The movable conductor 103 in which the return spring 10 extends and is connected to the shaft 8 moves to the right of the paper surface in FIG. 1 so as to separate the movable side contact 104 and the fixed side contact 105, and the accumulating force of the opening pole spring 107. At the same time, the contacts are completely separated. The movable iron core 2 returns to the initial position. As a result, the electromagnetic actuator 100 is in the demagnetized state, and the circuit breaker 110 is in the open pole state shown in FIG.

FIG. 5 is a diagram showing a magnetic circuit at an initial position of a movable iron core 2 of the electromagnetic actuator 100 according to the first embodiment.
As shown in FIG. 5, at the initial position, the gap g1 between the yoke protrusion tip surface 7c and the fixed iron core end surface 3a is smaller than the gap s1 between the movable iron core end surface 2a and the fixed iron core end surface 3a. Therefore, the magnetic flux 24 in the axial direction in the magnetic circuit generated by energizing the coil 1 has a magnetic flux 24a passing through the movable iron core 2 and a magnetic flux 24b passing through the yoke protrusion 7. A part of the magnetic flux 24 in the axial direction flows from the yoke main protrusion 7a of the yoke protrusion 7 through the yoke fine protrusion 7b to the fixed iron core 3, and the magnetic flux flowing to the movable iron core 2 becomes smaller. Until the position of the movable iron core end surface 2a of the movable iron core 2 exceeds the yoke protrusion tip surface 7c, the driving force applied to the movable iron core 2 is reduced, and the exciting operation of the electromagnetic actuator 100 can be slowed down. As a result, the contacts of the circuit breaker 110 can be turned on at low speed.

Further, when the movable iron core 2 moves toward the fixed core 3 and the movable iron core 2 is separated from the movable side lid plate 6, the magnetic flux passes through the movable iron core 2 and the fixed iron core 3 from the yoke protrusion 7. As the movable iron core 2 moves, the gap s1 between the movable iron core end surface 2a and the fixed iron core end surface 3a becomes smaller. When the position of the movable iron core end surface 2a of the movable iron core 2 exceeds the yoke protrusion tip surface 7c, the gap g1 between the yoke protrusion tip surface 7c and the fixed iron core end surface 3a becomes the movable iron core end surface 2a and the fixed iron core end surface 3a. Since it is larger than the gap s1 between them, almost all of the magnetic flux in the axial direction passes through the movable iron core 2 from the yoke protrusion 7. In the holding state where the excitation operation is completed, almost all of the magnetic flux in the axial direction passes through the movable iron core 2. Therefore, after the movable iron core end surface 2a of the movable iron core 2 exceeds the yoke protruding portion tip end surface 7c of the yoke protruding portion 7, the driving force applied to the movable iron core 2 becomes large, and the attractive force in the excited holding state can be improved.

Further, as described above, the contact surface 16 between the movable core 2 and the fixed core 3 is located on the moving direction side of the movable core 2 with respect to the axial center of the coil 1, and is the length of the movable core 2. By extending the yoke thin protrusion 7b of the yoke protrusion 7 in the direction of the fixed iron core 3, the facing area between the yoke protrusion 7 and the movable iron core 2 in the vertical direction in the axial direction becomes large, and excitation is maintained. The suction power of the state can be further improved.

According to the electromagnetic actuator according to the first embodiment, after the movement of the shaft is stopped by bringing the movable side contact and the fixed side contact into contact with each other, the movable iron core can move to the fixed core with respect to the shaft, and the electromagnetic actuator itself The wipe amount when the circuit breaker is closed can be maintained by the operation operation.
According to the circuit breaker using the electromagnetic actuator according to the first embodiment, it is not necessary to provide a mechanism for maintaining the wipe amount separately from the electromagnetic actuator, so that the circuit breaker can be miniaturized.

Further, according to the electromagnetic actuator according to the first embodiment, the contact surface between the movable iron core and the fixed iron core is located on the moving direction side of the movable iron core with respect to the center position of the coil in the axial direction of the coil. The distance between the surface and the initial position can be secured. Even if the length of the movable iron core in the axial direction is long, the movable iron core can be configured without protruding outward from the movable side lid plate at the initial position, so that the external dimensions of the electromagnetic actuator can be miniaturized. Along with this, it is possible to reduce the size of the circuit breaker using this electromagnetic actuator.

Further, according to the electromagnetic actuator according to the first embodiment, the configuration in which the yoke fine protrusion is provided on the yoke protrusion has the effect of slowing down the excitation operation and improving the attractive force in the excitation holding state. Along with this, it is possible to improve the holding force between the contacts of the circuit breaker using this electromagnetic actuator at low speed and in the closed pole state.

Embodiment 2.
6 and 7 are cross-sectional views of the electromagnetic actuator 200 according to the second embodiment of the present disclosure.
FIG. 6 is a cross-sectional view showing a demagnetized state of the electromagnetic actuator 200 according to the second embodiment corresponding to the open pole state of the circuit breaker shown in FIG. FIG. 6 is a cross-sectional view showing a state in which the movable iron core 2 is in the initial position in the demagnetized state of the electromagnetic actuator 200 shown in FIG.
FIG. 7 is a cross-sectional view showing a completed state of excitation operation of the electromagnetic actuator 200 according to the second embodiment corresponding to the closed pole state of the circuit breaker shown in FIG. In the excited operation completed state of the electromagnetic actuator 200 shown in FIG. 7, the movable iron core 2 is in contact with the fixed core 3.
Similar to the electromagnetic actuator 100 shown in FIGS. 1 and 2, the electromagnetic actuator 200 urges the movable contacts of the circuit breaker in the closing direction, and is used for operating the opening / closing operation between the contacts.

In the second embodiment, the same reference numerals are used for the same components as those in the first embodiment of the present disclosure, and the description of the same or corresponding parts will be omitted. Hereinafter, the difference between the electromagnetic actuator 200 according to the second embodiment and the first embodiment will be described with reference to the drawings.

As shown in FIGS. 6 and 7, the electromagnetic actuator 200 is arranged in the axial direction of the coil 1 and the tubular coil 1 that generates an axial magnetic flux due to the flow of an electric current, and reciprocates in the axial direction of the coil 1. In the axial direction of the movable iron core 2 installed in a possible state, the shaft 8 which is surrounded by the movable iron core 2 and can move together with the movable iron core 2, the tubular yoke pipe 4 surrounding the coil 1, and the coil 1. , The fixed side lid plate 5 arranged at one end of the yoke pipe, the movable side lid plate 6 arranged at the other end of the yoke pipe 4 in the axial direction of the coil 1, and the fixed side on the inner peripheral side of the coil 1. The fixed iron core 23 arranged in the direction from the lid plate 5 toward the movable side lid plate 6 and the inner peripheral side of the coil 1 face the fixed iron core 23 in the direction from the movable side lid plate 6 toward the fixed side lid plate 5. It has a tubular yoke projecting portion 27 that projects so as to.

Each part of the yoke pipe 4, the fixed side lid plate 5, the movable side lid plate 6, the fixed iron core 23, and the yoke projecting portion 27 is a stepped integrated type and is made of a magnetic material. A typical magnetic material is, for example, iron.
Further, in each of the yoke pipe 4, the fixed side lid plate 5, the movable side lid plate 6, the fixed iron core 23, and the yoke protruding portion 27, a magnetic circuit is excited together with the movable iron core 2 by energizing the coil 1.

In the second embodiment, the configuration of the fixed iron core 23 and the yoke protrusion 27 is different from the configuration of the fixed iron core 3 and the yoke protrusion 7 of the first embodiment. In the electromagnetic actuator 200 according to the second embodiment, the configurations other than the fixed iron core 23 and the yoke protrusion 27 are the same as those in the first embodiment. Each has the same effect.

Next, the structure of the yoke protrusion 27 and the positional relationship with the movable iron core 2 in the electromagnetic actuator 200 according to the first embodiment will be described.
The yoke projecting portion 27 projects in the direction from the movable side lid plate 6 toward the fixed side lid plate 5 so as to surround a part of the movable iron core 2 at the initial position, and the outer diameter and inner diameter of the yoke projecting portion 27 are the same. be. The yoke protrusion 27 has a yoke protrusion tip surface 27a, which is an annular end surface facing the fixed iron core 23, and a yoke protrusion inner wall surface 27b facing the movable iron core outer wall surface 2b, which is the outer wall surface of the movable iron core 2.

Next, the structure of the fixed iron core 23 and the positional relationship between the movable iron core 2 and the yoke protrusion 27 in the electromagnetic actuator 200 according to the first embodiment will be described.
The fixed iron core 23 has a fixed iron core base portion 23a arranged on the fixed side lid plate 5 side, and a fixed iron core fine protrusion 23b extending in a direction extending from the fixed iron core base portion 23a toward the movable side lid plate 6. The fixed iron core base portion 23a and the fixed iron core fine protrusion portion 23b may be integrally formed or may be composed of separate parts.

The fixed iron core base 23a is arranged so as to face the movable iron core 2 and the yoke projecting portion 27 surrounding the movable iron core 2. The fixed iron core base 23a has a fixed iron core end surface 23c which is an end surface facing the movable iron core 2. The fixed iron core end surface 23c is an annular surface facing the movable iron core end surface 2a, and is located closer to the fixed side lid plate 5 than the axial center of the coil 1.
At the initial position, the movable iron core end surface 2a and the fixed iron core end surface 23c are arranged at opposite positions with a gap s2 having a predetermined distance. The movable iron core 2 is excited and driven in the axial direction toward the fixed iron core 23, the gap s2 becomes smaller as the movable iron core 2 moves, and when the excitation operation is completed, the movable iron core end surface 2a comes into contact with the fixed iron core end surface 23c. The gap s2 becomes zero.

As shown in FIG. 7, the surface at which the movable iron core end surface 2a of the movable iron core 2 comes into contact with the fixed iron core end surface 23c of the fixed iron core 23 in the excited operation completed state is referred to as an abutting surface 26. The position of the abutting surface 26 is the same as the position of the fixed iron core end surface 23c, and is located on the moving direction side of the movable iron core 2 with respect to the center position of the coil 1 in the axial direction of the coil 1. That is, it is located on the fixed side lid plate 5 side with respect to the axial center of the coil 1.
As a result, a sufficient distance between the contact surface 26 and the movable iron core end surface 2a at the initial position can be obtained.

Further, as shown in FIG. 6, in the fixed iron core base 23a, the shaft protrusion 8c and the return spring 10 are accommodated at the axial center of the fixed iron core end surface 23c so as to face the shaft protrusion 8c of the shaft 8. A recessed fixed iron core recess 23f is formed. A fixed iron core step portion 23g which is stepped on the inner wall surface of the fixed iron core recess 23f and faces the shaft protrusion portion is provided. In the excited operation completed state shown in FIG. 7, the shaft protrusion 8c is surrounded so as to fit in the fixed iron core step portion 23g.

The fixed iron core thin protrusion 23b extends in the direction of the movable iron core 2 and is presented in a cylindrical shape so as to surround the movable iron core tip portion 2c which is the tip portion in the direction of moving to the fixed iron core base 23a of the movable iron core 2. The fixed iron core thin projecting portion 23b has a fixed iron core tip surface 23d which is an annular end surface facing the yoke projecting portion 27, and a fixed iron core inner wall surface 23e which is an inner wall surface facing the movable iron core outer wall surface 2b. In the initial position, in the axial direction of the movable iron core 2, the movable iron core tip portion 2c is surrounded by the fixed core thin protrusion portion 23b, and the portion on the movable side lid plate 6 side other than the movable iron core tip portion 2c is the yoke protrusion portion 27. Surrounded by.

The fixed iron core tip surface 23d protrudes from the yoke protrusion 27 from the position of the movable iron core end surface 2a at the initial position. A gap g2 having a predetermined distance is provided between the tip surface 27a of the yoke protrusion and the tip surface 23d of the fixed iron core at opposite positions. The gap g2 is smaller than the gap s2 at the initial position.

Next, the operation of the electromagnetic actuator 200 will be described.
By energizing the coil 1, a magnetic circuit including a movable iron core 2, a fixed iron core 23, a fixed side lid plate 5, a yoke pipe 4, a movable side lid plate 6, and a yoke projecting portion 27 is excited, and a magnetic attraction force is applied to the movable iron core 2. Is working, and the movable core 2 is driven in the direction of the fixed core 23. The movable iron core 2 shown in FIG. 6 is driven from the initial position to the position where the movable iron core 2 in the excitation operation completed state shown in FIG. 7 is in contact with the fixed iron core 23. The circuit breaker 110 changes from the open pole state shown in FIG. 1 to the closed pole state shown in FIG.

As the movable core 2 moves in the direction toward the fixed core 23, the pressure spring 9 that connects the movable core 2 and the shaft 8 is pressed by the moving movable core 2, and the shaft 8 is pressed together with the movable core 2 on the movable side. It moves in the axial direction from the lid plate 6 side toward the fixed side lid plate 5. The contacts of the circuit breaker come into contact with each other via a movable conductor connected to the shaft 8. When the contacts come into contact, the shaft 8 stops. After the movement of the shaft 8 is stopped, the movable iron core 2 is driven by a magnetic attraction so as to move to a position where the shaft 8 is further in contact with the fixed iron core 23. After that, the movable iron core end surface 2a of the movable iron core 2 and the fixed iron core end surface 23c of the fixed iron core 23 come into contact with each other to complete the exciting operation, and the circuit breaker is closed.

After the movement of the shaft 8 is stopped by contacting the contacts of the circuit breaker, the movable iron core 2 moves with respect to the shaft 8 to further apply contact pressure to the contacts of the circuit breaker via the shaft 8. be able to. As a result, the wipe amount at the time of closing can be maintained by the operation operation of the electromagnetic actuator itself.

As shown in FIG. 7, when the movable core 2 abuts on the fixed core 23 and the excitation operation is completed, the return spring 10 is crimped and the shaft 8 abuts on the fixed core 23 via the return spring 10. At this time, the shaft protrusion 8c is surrounded so as to fit in the fixed iron core recess 23f, and does not completely abut with the fixed iron core step portion 23g in the fixed iron core recess 23f, so that there is a gap 26a.
Since there is a gap 26a between the shaft protrusion 8c and the fixed iron core step portion 23g, the movable iron core 2 can apply contact pressure between the contacts via the shaft 8.
Further, in the excited operation completed state, the shaft protrusion 8c comes into contact with the fixed iron core step portion 23g via the return spring 10 in a state where the accumulating force of the pressure contact spring 9 remains. Since there is a gap 26a, the accumulating force of the pressure contact spring 9 can be released when the magnetic circuit is demagnetized. In the electromagnetic actuator, an attractive force may act between the movable core and the fixed core due to the influence of the residual magnetic field, and the movable core 2 can be separated from the fixed core 23 by utilizing the accumulating force of the pressure contact spring 9. .. Since the accumulating force of the pressure contact spring 9 can be utilized, the size of the return spring 10 provided on the fixed iron core 23 side can be reduced, and the return spring 10 can be downsized.

When the magnetic circuit is demagnetized by stopping the energization of the coil 1, the magnetic attraction force disappears, the pressure spring 9 extends, and the movable iron core 2 moves in the direction opposite to the direction in which the fixed iron core 23 is arranged. The movable iron core 2 is applied to the end portion 8b of the second shaft, and the shaft 8 moves together with the movable iron core. The return spring 10 extends and the movable conductor 103 connected to the shaft 8 moves in a direction that separates the movable side contact 104 and the fixed side contact 105, and the contacts are completely separated together with the accumulating force of the opening pole spring 107. The movable iron core 2 returns to the initial position. As a result, the electromagnetic actuator 200 is in the demagnetized state, and the circuit breaker is in the open pole state.

FIG. 8 is a diagram showing a magnetic circuit at an initial position of the movable iron core 2 of the electromagnetic actuator 200 according to the second embodiment.
As shown in FIG. 8, at the initial position, the gap g2 between the yoke protrusion tip surface 27a and the fixed iron core tip surface 23d is smaller than the gap s2 between the movable iron core end surface 2a and the fixed iron core end surface 23c. Therefore, the magnetic flux 28 in the axial direction in the magnetic circuit generated by energizing the coil 1 has a magnetic flux 28a passing through the movable iron core 2 and a magnetic flux 28b passing through the fixed iron core fine protrusion 23b from the yoke protrusion 27. A part of the magnetic flux 28 in the axial direction flows from the yoke projecting portion 27 through the fixed iron core fine projecting portion 23b to the fixed iron core 23, and the magnetic flux flowing through the movable iron core 2 becomes small. The driving force applied to the movable iron core 2 is reduced, and the exciting operation of the electromagnetic actuator 200 can be slowed down. This makes it possible to turn on the contacts of the circuit breaker at low speed.

According to the electromagnetic actuator according to the second embodiment, after the movement of the shaft is stopped by bringing the movable side contact and the fixed side contact into contact with each other, the movable iron core can move to the fixed core with respect to the shaft, and the electromagnetic actuator itself The wipe amount when the circuit breaker is closed can be maintained by the operation operation.
According to the circuit breaker using the electromagnetic actuator according to the second embodiment, it is not necessary to provide a mechanism for maintaining the wipe amount separately from the electromagnetic actuator, so that the circuit breaker can be miniaturized.

Further, according to the electromagnetic actuator according to the second embodiment, the contact surface between the movable iron core and the fixed iron core is located on the moving direction side of the movable iron core with respect to the center position of the coil in the axial direction of the coil. The distance between the surface and the initial position can be secured. Even if the length of the movable iron core in the axial direction is long, the movable iron core can be configured without protruding outward from the movable side lid plate at the initial position, so that the external dimensions of the electromagnetic actuator can be miniaturized. Along with this, the circuit breaker using this electromagnetic actuator can be miniaturized.

Further, according to the electromagnetic actuator according to the second embodiment, the slowdown of the exciting operation can be improved by the configuration of the fixed iron core provided with the fine protrusion of the fixed iron core. Along with this, it is possible to turn on the contacts of the circuit breaker using this electromagnetic actuator at a low speed.

Embodiment 3.
9 and 10 are cross-sectional views of the electromagnetic actuator 300 according to the third embodiment of the present disclosure.
FIG. 9 is a cross-sectional view showing a demagnetized state of the electromagnetic actuator 300 according to the third embodiment, corresponding to the open pole state of the circuit breaker 110 shown in FIG. In the demagnetized state of the electromagnetic actuator 300 shown in FIG. 9, the movable iron core 2 of the electromagnetic actuator 300 is located at the initial position.
FIG. 10 is a cross-sectional view showing a completed state of the excitation operation of the electromagnetic actuator 300 according to the third embodiment, corresponding to the closed pole state of the circuit breaker 110 shown in FIG. In the excited operation completed state of the electromagnetic actuator 300 shown in FIG. 10, the movable iron core 2 is in contact with the fixed iron core 3.
Similar to the electromagnetic actuator 100 shown in FIGS. 1 and 2, the electromagnetic actuator 300 urges the movable contacts of the circuit breaker in the closing direction, and is used for operating the opening / closing operation between the contacts.

In the third embodiment, the same reference numerals are used for the same components as those in the first embodiment of the present disclosure, and the description of the same or corresponding parts will be omitted. Hereinafter, the difference between the electromagnetic actuator 300 according to the third embodiment and the first embodiment will be described with reference to the drawings.

As shown in FIGS. 9 and 10, in the electromagnetic actuator 300, a tubular coil 1 that generates an axial magnetic flux due to the flow of an electric current and a tubular space for accommodating the coil are formed in the coil 1. It surrounds a movable iron core 2 which is arranged in the axial direction and is installed in a state where it can reciprocate in the axial direction of the coil 1, and a shaft 8 which is surrounded by the movable iron core 2 and can move together with the movable iron core 2 and the coil 1. A tubular yoke pipe 4, a fixed side lid plate 5 arranged at one end of the yoke pipe in the axial direction of the coil 1, and a movable side lid arranged at the other end of the yoke pipe 4 in the axial direction of the coil 1. The plate 36, the fixed iron core 3 arranged on the inner peripheral side of the coil 1 in the direction from the fixed side lid plate 5 toward the movable side lid plate 36, and the fixed iron core 3 arranged on the inner peripheral side of the coil 1 from the movable side lid plate 36. It has a tubular yoke projecting portion 7 that projects so as to face the fixed iron core 3 in the direction toward the side lid plate 5.

Each part of the yoke pipe 4, the fixed side lid plate 5, the movable side lid plate 36, the fixed iron core 3, and the yoke projecting portion 7 is a stepped integrated type and is made of a magnetic material. A typical magnetic material is, for example, iron.
Further, in each of the yoke pipe 4, the fixed side lid plate 5, the movable side lid plate 36, the fixed iron core 3, and the yoke protruding portion 7, a magnetic circuit is excited together with the movable iron core 2 by energizing the coil 1.

In the third embodiment, the configuration of the movable side lid plate 36 is different from the configuration of the movable side lid plate 6 of the first embodiment.
As shown in FIG. 9, the movable side lid plate 36 is provided with an air outlet 33 penetrating the movable side lid plate 36 at a portion surrounded by the yoke protrusion 7.
Further, an airtight bearing is provided between the movable iron core 2 and the yoke projecting portion 7 to support the movement of the movable iron core 2 with respect to the yoke projecting portion 7 and prevent the outflow of air. The airtight bearing is movable together with the movable iron core 2, and is arranged so that air inside the electromagnetic actuator does not leak from between the movable iron core 2 and the yoke protrusion 7.
A plurality of airtight bearings can be provided between the movable iron core 2 and the yoke protrusion 7, and the airtightness and the holding stability of the movable iron core 2 can be improved.

As shown in FIGS. 9 and 10, at both ends of the movable iron core 2, a third movable iron core bearing 31 and a fourth movable iron core bearing 32, which are airtight bearings, are provided, respectively. The third movable iron core bearing 31 and the fourth movable iron core bearing 32 have a sealed configuration so that air inside the electromagnetic actuator does not leak from between the movable iron core 2 and the yoke protrusion 7, and the movable iron core. Together with 2, it is movably supported with respect to the yoke protrusion 7.

Further, a spring holding plate 34 is provided between the movable iron core 2 and the pressure contact spring 9. When the movable iron core 2 moves in the direction of the fixed iron core 3, the pressure contact spring 9 is pressed by the movable iron core 2 that moves via the spring pressing plate 34, and the shaft 8 is pressed together with the movable iron core 2 from the movable side lid plate 6 side. It moves in the axial direction toward the fixed side lid plate 5 side.
The spring holding plate 34 is also in contact with the movable iron core 2 and the shaft 8, and also has a function of closing the gap between the movable iron core 2 and the shaft 8 so that the air inside the movable iron core 2 does not leak.
In the electromagnetic actuator 300 according to the third embodiment, the configuration of the movable side lid plate 36 and the configuration other than the airtight bearing between the movable iron core 2 and the yoke protrusion 7 are the same as those of the first embodiment. Each has the same effect.

The operation of the electromagnetic actuator 300 according to the third embodiment will be described as being different from the first embodiment.
In the electromagnetic actuator 300, the magnetic circuit is demagnetized by stopping the energization of the coil 1, and when the movable iron core 2 moves from the position where it comes into contact with the fixed iron core 3 to the initial position, air is discharged from the air outlet 33. Is the same as in the first embodiment.

When the magnetic circuit is demagnetized by stopping the energization of the coil 1, the magnetic attraction force disappears, the pressure spring 9 extends, and the movable iron core 2 moves in the direction opposite to the direction in which the fixed iron core 3 is arranged. The movable iron core 2 is applied to the end portion 8b of the second shaft, and the shaft 8 moves together with the movable iron core 2. The return spring 10 extends and the movable conductor 103 connected to the shaft 8 moves in a direction that separates the movable side contact 104 and the fixed side contact 105, and the contacts are completely separated together with the accumulating force of the opening pole spring 107. The movable iron core 2 returns to the initial position. As a result, the electromagnetic actuator 300 is in the demagnetized state, and the circuit breaker is in the open pole state.

In FIG. 10, when moving in the initial position direction together with the movable iron core 2 and the shaft 8, air A between the movable iron core 2 and the movable side lid plate 36 is introduced from the air outlet 33 to the inside of the yoke protrusion 7 by an electromagnetic actuator. It is discharged to the outside of 300. The arrow 33a indicates the direction in which the air A inside the electromagnetic actuator 300 is discharged from the air outlet 33 to the outside of the electromagnetic actuator 300. The air A discharged from the air outlet 33 during the demagnetization operation can be used to extinguish the arc of the circuit breaker.
With the demagnetization operation of the electromagnetic actuator, the contacts of the circuit breaker are separated and an arc discharge occurs. The arc needs to be extinguished quickly. By blowing air on the arc generated between the contacts, it can be commutated to the arc extinguishing chamber side, and the arc can be extended and extinguished. As the amount of air blown to the arc increases, the arc extinguishing efficiency tends to increase. By using the air A discharged at high speed from the air outlet 33 during the demagnetization operation to extinguish the arc of the circuit breaker, the arc extinguishing efficiency at the time of arc generation can be improved.

The magnetic circuit in the electromagnetic actuator 300 according to the third embodiment is the same as the magnetic circuit in the first embodiment.

According to the electromagnetic actuator according to the third embodiment and the circuit breaker using the electromagnetic actuator, the electromagnetic actuator according to the first embodiment has the same effect.
Further, when the electromagnetic actuator is demagnetized, the air inside the electromagnetic actuator can be discharged from the air discharge port and used for extinguishing the arc of the circuit breaker, so that the arc extinguishing efficiency can be improved. Further, since the air discharged from the electromagnetic actuator itself can be used for extinguishing the arc, the cost and size of the circuit breaker can be reduced.

It should be noted that, within the scope of the disclosure, each embodiment can be combined, and each embodiment can be appropriately modified or omitted.

1 coil, 2 movable iron core, 2a movable iron core end surface, 2b movable iron core outer wall surface, 2c movable iron core tip, 3 fixed iron core, 3a fixed iron core end surface, 3b fixed iron core recess, 3c fixed iron core step, 4 yoke pipe, 5 fixed Side lid plate, 6 movable side lid plate, 7 yoke protrusion, 7a yoke main protrusion, 7b yoke fine protrusion, 7c yoke protrusion tip surface, 7d yoke protrusion inner wall surface, 8 shaft, 8a first shaft end , 8b 2nd shaft end, 9 contact pressure spring, 10 return spring, 11 1st shaft bearing, 12 2nd shaft bearing, 13 1st movable iron core bearing, 14 2nd movable iron core bearing Bearing, 23 fixed core, 23a fixed core base, 23b fixed core fine protrusion, 23c fixed core end face, 23d fixed core tip surface 23e fixed core inner wall surface, 23f fixed core recess, 23 g fixed core step, 24 magnetic flux, 27 yoke Protruding part, 27a, tip surface of yoke protruding part, 27b, inner wall surface of yoke protruding part, 28 magnetic flux, 31 third movable iron core bearing, 32 fourth movable iron core bearing, 33, air outlet, 36 movable side lid plate, 100 , Electromagnetic actuator, 110 circuit breaker, 101 lower conductor, 102 upper conductor, 103 movable conductor, 104 movable side contact, 105 fixed side contact, 106 flexible conductor, 107 open pole spring, 108 arc extinguishing chamber, 110 circuit breaker , 200, 300 Electromagnetic actuator

Claims

A cylindrical coil that generates magnetic flux in the axial direction when an electric current flows,
A movable iron core installed in a state where it can reciprocate in the axial direction of the coil,
A shaft that is surrounded by the movable iron core and can move together with the movable iron core by operating the opening / closing operation between the movable side contact and the fixed side contact of the circuit breaker.
A cylindrical yoke pipe surrounding the coil and
With the fixed side lid plate arranged at one end of the yoke pipe in the axial direction of the coil,
With the movable side lid plate arranged at the other end of the yoke pipe in the axial direction of the coil,
On the inner peripheral side of the coil, a fixed iron core arranged in a direction from the fixed side lid plate to the movable side lid plate, and
The inner peripheral side of the coil is provided with a cylindrical yoke projecting portion that projects from the movable side lid plate toward the fixed side lid plate so as to face the fixed iron core.
The movable iron core is
It is arranged in the space on the inner peripheral side of the yoke protrusion, and when excited by a current flowing through the coil, it moves from the initial position together with the shaft in the axial direction of the coil toward the fixed iron core. The movable side contact and the fixed side contact are brought into contact with each other to stop the movement of the shaft, and then the shaft is moved to a position where it comes into contact with the fixed iron core in the excited operation completed state. Electromagnetic actuator.
In the excited operation completed state, the contact surface that abuts the movable iron core and the fixed iron core is located on the moving direction side of the movable iron core with respect to the center position of the coil in the axial direction of the coil. The electromagnetic actuator according to claim 1.
The electromagnetic actuator according to claim 1 or 2, wherein the length of the movable iron core is longer than 1/2 of the length of the yoke pipe in the axial direction of the coil.
The shaft is characterized in that a shaft protrusion having a larger outer diameter than a portion of the shaft inserted into the movable iron core is provided at an end position of the movable iron core on the fixed side lid plate side. The electromagnetic actuator according to any one of claims 1 to 3.
The electromagnetic actuator according to claim 4, wherein a recessed fixed iron core recess is formed on the fixed iron core end surface, which is an end surface of the fixed iron core facing the movable iron core, so as to accommodate the shaft.
A fixed iron core step portion is formed on the inner wall surface of the fixed iron core recess so as to face the shaft protrusion.
The fifth aspect of the present invention is characterized in that, in the excited operation completed state, the shaft protrusion is surrounded so as to fit in the fixed iron core recess, and has a gap between the shaft protrusion and the fixed iron core step portion. The electromagnetic actuator described.
A return spring is arranged between the shaft protrusion and the fixed iron core recess.
The electromagnetic actuator according to claim 5 or 6, wherein the shaft and the fixed iron core are connected to each other via the return spring.
A pressure spring is arranged between the movable iron core and the shaft.
The electromagnetic actuator according to any one of claims 1 to 7, wherein the movable iron core and the shaft are connected to each other via the pressure contact spring.
Between the movable iron core and the shaft, the movable iron core is movably supported with respect to the shaft at the end position on the fixed side lid plate side of the movable iron core, and is provided on the shaft. The electromagnetic actuator according to any one of claims 1 to 8, wherein the movable iron core bearing of 1 is provided.
Between the movable iron core and the shaft, a second movable iron core bearing that movably supports the movable iron core together with the movable iron core is provided at the end position of the movable iron core on the movable side lid plate side. The electromagnetic actuator according to any one of claims 1 to 9, wherein the electromagnetic actuator is characterized in that.
The shaft
The first shaft end, which is one end penetrating the fixed side lid plate, and
It has a second shaft end, which is the other end that penetrates the movable side lid plate, and has.
The second shaft end is
The electromagnetic actuator according to any one of claims 1 to 10, wherein the outer diameter is formed to be larger than that of the portion of the shaft inserted into the movable iron core.
A first shaft bearing that supports the movement of the shaft is provided between the fixed side lid plate and the end of the first shaft.
The electromagnetic actuator according to claim 11, wherein a second shaft bearing that supports the movement of the shaft is provided between the movable side lid plate and the end of the second shaft.
The yoke protrusion is
With the yoke main protrusion arranged on the movable side lid plate side,
A yoke thin protrusion extending from the yoke main protrusion toward the fixed side lid plate,
The electromagnetic actuator according to any one of claims 1 to 12.
The fixed iron core
The fixed iron core base arranged on the fixed side lid plate side and
A fixed iron core fine protrusion extending in a direction from the fixed iron core base toward the movable side lid plate,
Have,
The fixed core base has a fixed core end face which is an end face facing the movable core.
Any of claims 1 to 13, wherein the fixed iron core fine protrusion portion is provided in a cylindrical shape so as to surround the tip portion of the movable iron core, which is the tip portion of the movable iron core in the direction of moving to the fixed iron core base. The electromagnetic actuator according to item 1.
According to any one of claims 1 to 14, the movable side lid plate is provided with an air outlet that penetrates the movable side lid plate at a portion surrounded by the yoke protrusion. The electromagnetic actuator described.
An airtight bearing is provided between the movable iron core and the yoke projecting portion to support the movement of the movable iron core with respect to the yoke projecting portion and prevent the outflow of air. The electromagnetic actuator according to claim 15.
The electromagnetic actuator according to claim 16, wherein a plurality of the airtight bearings are provided.
The electromagnetic wave according to any one of claims 15 to 17, wherein a spring holding plate for closing a gap between the movable iron core and the shaft is provided so that air inside the movable iron core does not leak. Actuator.
A circuit breaker characterized in that the electromagnetic actuator according to any one of claims 1 to 18 is used for the operation of opening / closing operation between the movable side contact and the fixed side contact.