JPS6319050B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to circuits and disconnectors, and more particularly to an electromagnetic operating device for closing and operating the circuit.

Operating devices for circuits and disconnectors can be roughly divided into electric spring operated types and electromagnetic operated types using solenoid coils. However, in general, the electromagnetically operated type is mainly used because it is inexpensive and has a simple structure. In this electromagnetic operating device, a pole piece, which is a fixed iron core, and an armature, which is a movable iron core, are built into a solenoid coil with a gap between them.When the solenoid coil is energized, the armature and pole piece are magnetized and attracted by the gap. It is configured to apply a force to move the armature, and this movement closes the main contact of the circuit or disconnector. However, in the conventional electromagnetic operating device, when the solenoid coil is energized, the armature moves slightly in the direction of closing the circuit only within the range where the attraction force is overcome due to the relationship between the attraction force and the load. Along with this movement, the inductance of the solenoid coil increases and suppresses the current, so the inertia of the armature itself can hardly be expected. In addition, at the minimum operating voltage specified by the standards for circuit breakers and disconnectors, the current flowing through the solenoid coil is also small, so the magnetomotive force is also small. ,60~70
When a large load is applied by the wipe spring at the position where the armature has moved by %, as shown in Figure 13, the magnetomotive force of the solenoid coil and the load by the wipe spring are balanced, the movement of the armature becomes stationary, and the current flowing through the solenoid coil decreases. The structure was such that the armature would begin to move after waiting for the rise of the temperature. As described above, in the structure of the conventional electromagnetic operating device, when the operating voltage of the solenoid coil changes, the input energy (magnetomotive force) changes, and the closing operation characteristics of the circuit and disconnector change. Furthermore, when a short circuit or the like is applied, the load increases due to the repulsive force caused by the large current, resulting in an incompletely applied state. In order to prevent this, the solenoid coil and iron core (armature, pole piece) have to be large, resulting in increased weight and high prices. In addition, in the link part that makes up the opening/closing mechanism, a two-stage toggle mechanism was used to reduce the load, but the structure was complicated and the stroke was large, so the solenoid coil had to be made larger. This caused the price to rise. In addition, the main shaft that connects and drives the three-phase opening/closing mechanism has no bearings, so the main shaft tilts due to unbalanced loads on the three phases, requiring a great deal of labor to balance it. I needed it.

In view of the above drawbacks, the present invention is small,
The object of the present invention is to obtain an electromagnetic operation device for circuits and disconnectors that has a simplified structure, reduced overall cost, and has constant closing operation characteristics even with changes in operating voltage.

An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show the overall structure of the electromagnetic operating device for circuit breakers of the present invention, and FIGS. 3 to 10 show partial details thereof.

In FIGS. 1 and 2, 101 is a solenoid coil frame, and link mechanism frame 102
is fixed at the top of the. 106 is an opening spring;
One end is hung on the lower part of the frame 101, and the other end is a lever 108 fixed to the main shaft 103.
It is applied to a stud 109a provided in the main shaft 103, and applies a rotational force to the main shaft 103 in the clockwise direction in FIG. Further, a lever 107 is fixed to the main shaft 103 at three equally divided positions, and each link 114 is connected to the pin 11 on the lever 107.
5. Also, the link 116 is
An operating rod 119 is rotatably supported by a pin 117 on a frame (not shown), and an operating rod 119 to which a movable main circuit contact is connected is connected to one end of the link 116, and a wipe spring 112 is connected to the other end.
The support 121 and the link 114 are connected to each other by a pin 122 via a circular hole.

The detailed configuration will be explained below using FIGS. 3 to 10.

First, use Figures 3 and 4 to determine the main shaft 10.
The support structure No. 3 will be explained. The bearing 124 is divided into two parts 124a and 124b on the left and right, and its inner peripheral surface engages with the shaft 103 in a freely rotatable manner.
The outer peripheral surface has a concave shape. The inner surface of the recess is formed by the frames 102, 102b and the plate 123.
When the plate 123 is fixed to the frame 102 with bolts, the recess of the bearing 124 formed by 124a and 124b and the frames 102, 102
The configuration is such that the circles formed by b and the plates 123 and 123a are concentric circles. Therefore, the main shaft 103 has bearings 124, 124a,
It is rotatably supported by the frame 102 via 124b. Further, since the frame 102 and the plate 123 are engaged with the recesses of the bearings 124a and 124b, movement of the bearing 124 is prevented.
Therefore, the middle of the main shaft to which the lever etc. are fixed by welding or the like can be supported by the support bearing.

The indicator section that displays the open and closed states of the main circuit contacts will be explained with reference to FIGS. 5 and 6.

Support 125 is fixed to frame 102. At this time, support 125 has stud 12.
6 and a stopper 127 are fixed, and the indicator 104 is rotatably supported by the stud 126. A pin 128 is fixed to the indicator 104 and connected to a circular hole 129a provided at one end of a link 129, and the other end of the link 129 is connected to a lever 1 fixed to the main shaft 103.
It is rotatably connected to a stud 109b supported by 08. Further, a pin 130 is fixed to the indicator 104, and a stud 12 is attached thereto.
Since one end of the spring 131 supported by the stud 127 is hung, and the other end of the spring 131 is hung by the stopper 127, the indicator 104 is attached to the stud 12.
6 is subjected to a rotational force in the counterclockwise direction in FIG.

Regarding the solenoid coil part for closing operation, Part 7
This will be explained using figures.

A pole piece 132 is fixed to the frame 101, and the pole piece 132 and the frame 10
1, a solenoid coil 133 is housed so as to wind around the pole piece 132. Further, an armature 135 including an armature rod 134 is housed in the solenoid coil 133, and the armature rod 134 is connected to the pole piece 1.
32 and is guided. Armature 1
A spring 137 is interposed between the pole piece 35 and the pole piece 132, and pushes the armature 135 upward in the anti-suction direction. Further, the armature 135 passes through a plate 136 fixed to the upper end of the frame 101, and as shown in FIG.
It also serves as a stopper for Armature 135.
At this time, the ring 138 guides the center of the armature 135 so that there is a constant gap between the hole 136a of the plate 136 and the armature 135.

Therefore, the magnetic circuit consists of frame 101 and plate 1.
36, an operating type 135, and a path for the pole piece 132.

The link mechanism will be explained with reference to the circuit and disconnector tripped state shown in FIG. Pin 10 is frame 1
02, and a trip catch 11 and a closing holding catch 12 are rotatably supported by a pin 10. Also, trip catch 1
A stud 13 is fixed to the stud 1, one end of a spring 14 is hung on the stud 13, and the other end of the spring 14 is hung on a stud 15 fixed to the frame 102. Therefore, the trip catch 11 is constantly subjected to a rotational force in the counterclockwise direction in FIG. 8 about the pin 10, and is engaged with the stud 15 to maintain its position. Also, a spring 16 supported by the pin 10
is a stud 1 whose one end is supported by a frame 102.
7 and the other end is hooked to the input holding catch 12. Therefore, the closing holding catch 12 is constantly subjected to a rotational force in the counterclockwise direction in FIG. 8 about the pin 10 due to the restoring force of the spring 16, and is engaged with the stud 17 to maintain its position.

The half-moon shaft 18 is rotatably supported by the frame 102, and the half-moon shaft 18 includes a plate 1.
9 is fixed. One end of a spring 21, which is hung on the frame 102, is hung on the plate 19, and the half-moon shaft 18 is constantly subjected to a rotational force in the counterclockwise direction in FIG. At this time, the plate 19 is attached to the stud 2 fixed to the frame 102.
0, and the position of the half-moon shaft 18 is maintained. At this time, the half-moon shaft 18 and the trip catch 11 are in an engaged relationship. Link 2
2 has one end rotatably connected to the trip catch 11 by a pin 23, and the link 24 has one end rotatably connected to a lever 107 fixed to the main shaft 103 by a pin 25.
The other end of the link 24 is connected to a pin 27 along with a roller 26.
are rotatably connected to each other.

Further, a pin 28 is rotatably supported in the middle of the link 24, and a roller 2 is provided around the pin 28.
9 is rotatably supported.

Next, the operation of the present invention having the above configuration will be explained.

The closing operation of the circuit or disconnector is performed by energizing the armature 135 as shown in FIG. 7 when the solenoid coil 133 is energized in the tripped state shown in FIG.
A magnetic flux Φ flows between the armature 135 and the pole piece 132, and magnetic fluxes Φa and Φb flow in a divided manner between the armature 135 and the plate 136. At this time, the current flowing through the solenoid coil 133 gradually increases due to the influence of inductance, and the magnetic flux of each part increases.
Φ, Φa, and Φb also increase accordingly, and the magnetic flux Φ between the armature 135 and the pole piece 132
An attractive force F due to the magnetic flux Φb acts between the armature 135 and the plate 136.
Moreover, as shown in FIG. 14, the solenoid coil 1
33, at a small current at the beginning of flow, the relationship is approximately Φ = Φb, and armature 13
Since there is a gap between the armature 13 and the pole piece 132, there is a relationship of F<Fb, and the armature 13
5 and plate 132 maintain the suctioned state. However, as the current flowing through the solenoid coil 133 increases, the magnetic flux also increases and becomes Φ = Φa + Φb, but Φb shows a tendency to saturate.
As the relationship Φ>Φb increases, the attraction force also becomes the relationship F<Fb→F=Fb, F>Fb, and the armature 135 moves towards the pole piece 132 and suddenly strikes with a force greater than Fb. move downwards.
Therefore, the armature 135 operates with inertial energy. In the embodiment, the minimum operating voltage of the circuit and disconnector specified by the standard is the rated value.
60% to 70% because it is more than 75% against 100%
The armature is set to operate.

As the armature 135 moves, the armature rod 134 also moves downward and acts to push down the roller 26 shown in FIG. 8.

At this time, as shown in FIG. 11, since the link 24 is configured with an angle of "O" to the armature rod 134, the link 22 receives a force of ₂₂ , and the trip catch 11 is clocked by a force of ₂₂ . Obtain the rotational force in the direction.

However, at this time, since the trip catch 11 and the half-moon shaft 18 are engaged, rotation of the trip catch 11 is prevented, and the state shown in FIG. 8 is maintained. As the armature rod 134 is pushed down by the suction force, the link 2
2 rotates clockwise (downward) about the pin 23, and the main shaft 103 connected by the link 24 rotates counterclockwise. Along with that,
Since the link 116 is connected to the link 114 and the support 121 via the wipe spring 112, it rotates counterclockwise around the pin 117,
The operating rod 119 connected to the link 116 is pushed up, and the main circuit contact 120 is closed. At this time, as the link 22 rotates, the roller 29 provided on the link 24 also moves downwards and pushes the loading holding catch 12, causing the closing holding catch 12 to move toward the pin 10.
Rotate clockwise around the axis. When the armature 135 and the pole piece 132 come into contact, a gap is created between the closing holding catch 12 and the roller 29, and the closing holding catch 12 is rotated counterclockwise by the return force of the spring 16, and the solenoid coil 13
3 is released, the return force of the spring 137 causes the armature 135 and the armature rod 1 to
34 is pushed up. At this time, the roller 29 engages the charging holding catch 12 to maintain the charging state shown in FIG. 9.

Further, the indicator 104 indicates that when the closing operation is performed from the tripped state shown in FIG. 5, the link 129 connected to the lever 108 fixed to the main shaft 103 moves downward,
The pin 128 provided in the indicator 104 engages with the circular hole 129a of No. 29, and the indicator 10
4 rotates clockwise about the stud 126, distorting the spring 131, and in the closed state, the state shown in FIG. 6 is achieved.

In the tripping operation, when the circuit is closed by the closing operation in FIG. 9, the manual tripping button 111 or the tripping coil 110 shown in FIG.
When the half-moon shaft 18 is energized, the half-moon shaft 18 rotates clockwise, and the trip catch 11 and the half-moon shaft 18 are disengaged. At this time, the link 24 is connected to the first
As shown in _FIG .
Since the link 24 receives a clockwise rotational force about the pin 29, the trip catch 11 connected to the link 24 by the link 22 receives a clockwise rotational force about the pin 10, and the trip catch 11 rotates, and the charge holding catch 1
6 and the roller 29 are disengaged, and the main shaft 103 is rotated clockwise by the releasing force of the wipe spring 112 and the opening spring 106. Along with this, the link 114 via the wipe spring 112,
Links 116 connected by supports 121
rotates clockwise about pin 117, and is pulled until operating rod 119 connected to link 116 contacts stopper 139, opening main circuit contact 120.

Also, the trip catch 11 rotated clockwise.
is rotated counterclockwise by a spring 14 applied to a pin 13 provided on the trip catch 11 and comes into contact with a pin 15. At this time, trip catch 11
A gap is created between the half-moon shaft 18 and the half-moon shaft 18, which is connected to the spring 21 hung on the plate 19.
to rotate counterclockwise and release trip catch 1.
1 and the half-moon shaft 18 are brought into engagement, and the tripping operation is completed.

Further, when the indicator section is pulled out from the closed state shown in FIG.
However, since the indicator 104 is free in the circular hole 129a of the link 129, the indicator 104 rotates counterclockwise by the restoring force of the spring 131, and the indicator 104 comes into contact with the stud 127 and stops. At this time, the pin 128 is located approximately in the middle of the circular hole portion 129a. Therefore, since the indicator 104 operates without being subjected to the impact force of the tripping operation, it has become possible to have a simple structure.

The free trip state is shown in FIG.

As described above, according to the present invention, by providing a step in the armature of the electromagnetic operating device and bringing it into contact with the upper magnetic frame, the armature can be operated rapidly and the closing operation characteristics can be made stable. .

In addition, in the link part, by arranging the closing catch and the trip catch on the same axis, and by having the trip catch also serve as the link of the first section, the link part can be made smaller and simpler, and furthermore, the two-piece bearing of the present invention can be used. This makes it easy to support shafts to which levers and the like are welded. In addition, in the indicator part, by connecting the indicator with a link with a circular hole and returning it with spring force, the circuit and disconnector are not affected by the impact force during the tripping operation. "Open" and "Open/Close" can be displayed. Therefore, it is possible to provide an overall compact, simplified, and inexpensive circuit and disconnector.

[Brief explanation of the drawing]

Fig. 1 is a front view of the electromagnetic operating device for a circuit breaker of the present invention, Fig. 2 is a right side view of the same, Fig. 3 is a detailed view of the front part, and Fig. 4 is a detail of the right side part. figure,
Fig. 5 is a detailed view of the right side of the operation indicator according to the present invention, showing the tripped state, Fig. 6 is a detailed view of the right side of the same operation indicator, showing the closed state, and Fig. 7 is the same. A detailed view of the right side portion of the solenoid coil section, Fig. 8 is a sectional view of the right side of the electromagnetic operating device of the present invention, showing the tripped state, and Fig. 9 is a sectional view of the right side of the electromagnetic operating device of the present invention, showing the activated state. Figure 10 is a cross-sectional view of the right side of the link mechanism and shows the free state, Figure 11 is a diagram showing the force components of the link mechanism during the closing operation, and Figure 12 is a diagram showing the state. A diagram showing the force components of the link mechanism in the closed state; FIG. 13 is a diagram showing the relationship between the solenoid coil current, armature stroke, and main contact stroke of a conventional electromagnetic operating device; FIG. FIG. 3 is a diagram showing the relationship between solenoid current, armature stroke, and main contact stroke of the electromagnetic operating device according to the present invention. 101... Solenoid coil frame, 102
...Mechanism frame, 103...Main shaft, 10
4... Indicator, 124... Bearing, 129... Link, 133... Solenoid coil, 135... Armature, 136... Plate, 10... Pin, 11
... Trip catch, 12... Closing holding catch,
18...Half-moon shaft, 29...Roller.

Claims (1)

[Claims] 1 In a circuit or disconnector having an electromagnetic operation device, the closing catch 12 and the trip catch 1
1, the pin 10 is fitted as a common shaft, the lever 107 is fixed to the main shaft 103 whose both ends are pivotally supported on the frame, and one end of the lever 107 is connected to the operating rod 19 via a link mechanism. The other end is connected to one end of the link 24 via a pin 25, the other end of the link 24 is connected to one end of the link 22 via a pin 27, a roller 26 is fitted to the pin 27, and the other end of the link 24 is connected to one end of the link 24 via a pin 25. Pin 23 on the end
The trip catch 11 is connected to one end of the trip catch 11 via a half-moon shaped shaft 18.
A pin 28 is attached to the center of the link 24. A roller 29 is attached to the pin 28 so that it can rotate freely, and the tip of the rod 134 of the armature 135 is attached to the roller 26 by excitation of the solenoid coil 133.
At the position where the main circuit contact 120 closes, the tip of the holding catch 12 is engaged with the roller 29 to maintain the closed state of the main circuit contact 120, and the holding catch 12 has a spring. 16 always applies a rotational force in one direction, and the holding catch 12 that receives this one-way rotational force is locked with a stud 17. When the holding catch 12 is released, the state of engagement between the holding catch 12 and the roller 29 is controlled by a half-moon shaped shaft. By releasing the lock of the catch 11 with the movement of 18, the spring force generated in the lever 107 that acts on the main circuit contact 120 in the opening direction is transmitted to the holding catch 12 against the spring 16, and the connection with the roller 29 is made. A circuit disconnector characterized by releasing engagement.