JPH04312736A - Remote control type circuit breaker - Google Patents

Abstract

PURPOSE:To reduce the operating voltage of the electromagnet of a remote control type circuit breaker. CONSTITUTION:A contact lever 55 is supported on one rotating end of a magnet link 53 the other end of which is driven by the attracting/releasing operation of an electromagnetic part 300. One end of the contact lever 55 is linked to a contact part 100, and the other end is generally supported by a pressure plate 51 engaged with a toggle link mechanism. At the time of trip operation, this other end is driven by the pressure plate 51.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remotely operated circuit breaker which has, in addition to the circuit breaker's original breaking function, a function of frequently opening and closing the circuit breaker in response to remote control.

0002

[Prior art] Figs.
10 is a schematic diagram showing the main structure of a conventional remote-controlled circuit breaker described in Japanese Patent No. 225, and FIG. 10 is a side view showing a state in which the control handle is off and the remote control is off. Figure 11
12 is a side view showing a state where the control handle is on and the remote control is off, FIG. 12 is a side view showing a state where the control handle is on and the remote control is on, and FIG. 13 is a side view showing a trip state. In FIG. 10, a contact portion (100) is provided on the lower left side inside the case (105) of the remote-controlled circuit breaker. The power supply side fixed contact (109) is welded to the power supply side stator (108). The movable element (110) has a power supply side movable contact (111) and a load side movable contact (112) on both its left and right sides. The mover holder (113) is made of an insulator, and the mover (
110). The cross bar (114) spans each pole, and the mover holder (113) is slidably fitted and housed therein. The push spring (115) is for urging the movable element (110) in the direction of closing the circuit. The load side fixed contact (112) faces the load side movable contact (112).
16) is welded to the load side stator (117).

[0003] The electromagnetic part (200) is a magnet frame (
125) contains an electromagnetic coil (126) and a fixed iron core (128).
) and a movable iron core (130). Movable iron core (
130) is fixed to a holder (131), and bearings (131b) are provided at both ends of the holder (131), and the transmission lever (134) is connected to the transmission lever (134) via the shaft (133).
It is connected to the. Further, the transmission lever (134) is supported by a shaft (135) on the magnet frame (125), and each protrusion (134b) of the transmission lever (134) is supported by a shaft (135).
) and the magnet frame (125) biases the movable core (130) and the fixed core (128) in the direction of opening.

[0004] A control mechanism section (300) is arranged in the middle portion of the front side of the case (105). Control handle (
150) is rotatably supported by a shaft (151) and protrudes outward from the case (105) so that it can be manually operated.
153) to the link (154), forming a toggle link mechanism. A roller (155) is rotatably supported at the other end of the link (154). The lever (156) is rotatably supported by the shaft (151), and its tip is locked with the latch (157). The latch (157) is rotatably supported by a shaft (158) and biased counterclockwise by a torsion spring (not shown). The trip bar (159) is the shaft (160)
It is rotatably supported by, biased clockwise by a torsion spring (not shown), and adapted to engage a latch (157). The push plate (161) is the case (10
5), and is held movable up and down with respect to the tension spring (162
) and a roller (155) on the upper end surface.
) is on board. The roller (155) is the lever (156)
It is also engaged with The control lever (163) is connected to the shaft (164
), one end (163a) of which engages with the crossbar (114), and the other end (163b) of which engages with the locking portion (134c) of the transmission lever (134). Furthermore, the control lever (163) has its protrusion (1
63c) is also engaged with the push plate (161). In FIG. 10, since the control handle (150) is in the OFF state, the control lever (163) is restrained upwardly by the spring (162) via the push plate (161). That is,
Since the load of the tension spring (162) is greater than the load of the push spring (115) that urges the mover (110), the control lever (163) is held in the state shown in FIG. 10, and both contacts (10
9) and (111) and (112) and (116) are open. At this time, as shown in FIG. 10, the other end (163b) of the control lever (163) and the transmission lever (
A gap is formed between the locking portion (134c) and the locking portion (134c).

Next, the operation of the above conventional example will be explained. When the control handle (150) is tilted to the right and set to the auto position from the state shown in Fig. 10, the link (154) extends (becomes vertical) and the push plate (161) is pulled as shown in Fig. 11. It lowers against the spring (162) and releases the control lever (163). Control lever (16
3) is rotated clockwise via the crossbar (114) by the push spring (115) of the contact part (100), and when the gap between the electromagnetic part (200) and the transmission lever (134) disappears, the transmission lever (134) is biased by the tension spring (
136). This is a push spring (1
This is because the load on the tension spring (136) is designed to be greater than the load on the spring (15). At this time, the mover (1
10) is a transmission lever (134) and a control lever (163)
The distance between the two contacts (109) and (111) and between (112) and (116) is slightly reduced compared to the state shown in FIG. 10.

[0006] Then, with the handle auto shown in FIG.
When the electromagnetic part (200) is not energized (remote off), when voltage is applied to the coil (126) from the outside, the coil (126)
26) is excited and the movable core (130) becomes the fixed core (1
28). In order to rotate the transmission lever (134) together with the movable iron core (130) counterclockwise against the tension spring (136) to release the control lever (163), the mover (110) is moved by the push spring (115). , and both contacts (109) and (111) and (112) and (116) are closed. FIG. 12 shows the state when the coil (126) is energized (remotely turned on) in this handle auto mode.

Next, in FIG. 12, when the voltage application to the coil (126) is turned off, the movable iron core (130) is moved in the opening direction by the tension spring (136), and the tension spring (1
The control lever (163) rotates counterclockwise due to clockwise rotation of the transmission lever (134) receiving the pulling force of
The contact points (109) and (111) and (112) and (116) are opened, respectively, and the state shown in FIG. 11 is returned again. In this way, FIGS. 11 and 12
This state is repeated according to the on/off command signal. In this way, the contacts can be opened and closed by remote control (voltage application) without going through the control mechanism section (300).

When an overcurrent flows in FIG. 12, as shown in FIG.
As shown, the bimetal (167) is curved to the right,
Push the trip bar (159) via the actuation piece (180). The trip bar (159) rotates counterclockwise against the torsion spring, and the latch (157) further rotates clockwise against the torsion spring. Rotation of this latch (157) releases the engagement with the lever (156), so the push plate (161) is moved by the tension spring (
162) pushes the roller (155) to the left side together with the lever (156) and raises it, and rotates the control lever (163) counterclockwise against the push spring (115) to open both contacts (109) and (111). ) and (112) and (
116) respectively.

At this time, at the same time, a limit switch (not shown) that detects the rise of the push plate (161) stops energizing the coil (126), so the movable core (130) is released in the same way as in the OFF operation. , transmission lever (134)
Both contacts (109) by control lever (163) via
The force is transmitted in the direction of opening (111), (112), and (116), respectively. That is, the contact part (10
Two spring loads of a tension spring (162) and a tension spring (136) act on the spring (162) and the tension spring (136), and a very strong force is applied to both the contacts (109) and (111) and (
112) and (116), respectively. The reset operation is performed by tilting the control handle (150) to the left (off direction) from the state shown in FIG.
1) Complete by engaging with the latch (157) while placed on top.

0010

[Problems to be Solved by the Invention] In the conventional remote-controlled circuit breaker as described above, when transitioning from the contact OFF state (FIG. 11) to the contact ON state (FIG. 12), the electromagnetic coil (12
6) is a rotation of the transmission lever (134) in the counterclockwise direction, which is transmitted by the push spring (115) via the control lever (163) from the moment M1 which attempts to rotate the transmission lever (134) clockwise due to the tension spring (136). The movable iron core (130
) is aspirated. Therefore, these moments M1, M2
It is necessary to accurately adjust the balance between M3 and M3. However, in reality, there are variations in spring characteristics between individual products, and the use of two springs (136, 115) further amplifies the effects of these variations. In addition, moment M2 is originally an electromagnetic coil (126)
However, since the friction between the control lever (163) and the transmission lever (134) is large, the force of the push spring (115) is considerably weakened by the friction, and the force of the push spring (115) is considerably weakened by that friction. The driving force required of the electromagnetic coil (126) increases.

For the reasons mentioned above, the electromagnetic coil (12
The operating voltage, which affects the attraction force (6), had to be set to a relatively large value in order to ensure reliable operation of the contacts. As a result, there is a problem in that vibrations during suction also increase, leading to malfunction of the latch mechanism. The present invention was made to solve this problem, and an object of the present invention is to provide a remotely operated circuit breaker that can lower the operating voltage of the electromagnetic coil (126).

0012

[Means for Solving the Problems] A remote-controlled circuit breaker according to the present invention is a remote-controlled circuit breaker in which a contact part, a cut-off mechanism linked thereto, and a high-frequency switching mechanism are housed in the same case. The device includes an electromagnet section, a link lever that is pivotally supported from the case and has one end driven by the attracting and releasing action of the electromagnet, and a link lever that is pivotally supported by the other end of the link lever, and one end of which is connected to the contact section. A contact lever that is linked together, an operation part that is pivotally supported from the case and has an operation handle at one end and forms a toggle link with a link connected to the other end, and the other end of the contact lever is connected to the contact lever. The lever has an engaging portion that is loosely fitted to allow the lever to rotate within a predetermined range, and a push plate whose one end is to be driven by engaging with the toggle link. be.

[0013]

[Operation] The link lever in the present invention (referred to as a mag link in the following embodiments) drives the contact lever while supporting it pivotally, and the contact lever drives the contact portion. At this time, the push plate holds the fulcrum position of the contact lever.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 9. FIG. 7 is a side sectional view showing a state in which the control handle is off and the remote control is off, FIG. 8 is a front view with the front cover partially removed, and FIG. 9 is a back view with the back cover partially removed. First, the overall structure of this remotely controlled circuit breaker will be explained with reference to FIGS. 7 to 9. In FIG. 7, the circuit breaker case (1) is composed of a front cover (1a), a base (1b), and a back cover (1c). The screw (
The power supply side terminal (2) tightened in step 3) is provided with a terminal screw (4) for connecting an external line. The contact part (100) is arranged near the back cover (1c), and the power supply side fixed contact (
5) is welded to the power supply side terminal (2). Movable element (6
) has a power supply side movable contact (7) and a load side movable contact (8) on both its left and right sides. The crossbar (9) straddles each pole, and the movable element (6) and spring receiver (10) are placed in the groove (9a).
and a push spring (11) are housed. Push spring (1
1) biases the movable element (6) in the closing direction via the spring support (10). A load-side fixed contact (12) facing the load-side movable contact (8) is welded to the load-side stator (13). The arc extinguishing parts (14A, 14B) are made of insulating plates (14a
) and an exhaust plate (14b), and has a grid (14c) made of a magnetic material. Arc Guard (1
5) is press-fitted into the back cover (1c). base(
There is an exhaust passage (16) between 1b) and the back cover (1c).
is provided. The mounting bracket (17) is attached to the back cover (1c
) and is urged rightward by a spring (18). The power supply side barrier (19) is connected to the base (1
b), and an exhaust hole (19a) is provided therein. Also on the load side, the base (1b) and back cover (1c)
An exhaust hole (19a) is provided between the two.

[0015] On the front side of the base (1b), an electromagnetic part (30
0) is fixed to the base (1b) by screws (20). FIG. 5 is a perspective view showing the detailed configuration of the electromagnetic section (300). In the figure, this electromagnetic part (300) is provided with a leaf spring (23) that biases the fixed core (22) upward on the frame (21) (hereinafter referred to as the "mag frame"). 22) is positioned on the mug frame (21) by a pin (24) passing through its hole (22a). A fixed iron core (22) is placed above the electromagnetic coil (25).
) is provided with a conical spring (27) that urges the movable iron core (26) upward. Core holder (28)
and the movable iron core (26) are fixed to each other by a pin (29) and are integrated. The terminal block (30) and the mug frame (21) are fixed with screws (31) and nuts (32). The control terminal (33) is provided with a screw (34) (FIG. 7) for connecting an external line. Changeover switch (3
5) and an actuator (35A) therefor are attached to the terminal block (30). The actuator (35A) is biased toward the front in the figure by a torsion spring (not shown) and is fixed by the switch cover (36). Figure 8
At the top of the attached stand (37) is an electronic circuit (38).
, a limit switch (39) is provided at the bottom. The actuator (39A) attached to the attachment base (37) is biased counterclockwise by a torsion spring (not shown). One end of the limit switch (39) is connected to one of the control terminals (33) in FIG. 7 by a lead wire (not shown), and the other end is connected to the electronic circuit section (38).
is connected to by a lead wire (not shown). The other control terminal (33) is directly connected to the electronic circuit section (38). In addition, both ends of the changeover switch (35) are connected to the electronic circuit section (
38). Furthermore, electronic circuit section (38)
Three lead wires (not shown) drawn out from the electromagnetic coil (25) are directly connected to. Terminal cover (40
) is provided to prevent the screw (34) from being exposed to the outside.

In FIG. 7, a control mechanism section (400) is arranged at the middle portion of the front side of the base (1b). The mechanism frame (41) is fixed to the base (1b) with screws (42), and the handle (43) is attached to the mechanism frame (41).
It is rotatably supported by a shaft (44). This handle (43) protrudes outward from the opening (1d) of the front cover (1a), and can be operated manually.
43a) is engaged with the link (46) by a pin (45), forming a toggle link. A roller (47) is rotatably supported at the other end of the link (46). The lever (48) is rotatably supported by a shaft (44) on the mechanism frame (41), and has a latch (49) at the tip.
It is locked to. The latch (49) is attached to the mechanism frame (4
1) is rotatably supported by a shaft (50) and urged counterclockwise by a torsion spring (not shown). The push plate (51) is inserted into the U-shaped groove (41a) of the mechanism frame (41).
It is held so as to be able to move up and down inside, and is biased upward by a tension spring (52). A roller (
47), and a lever (48) is engaged with the roller (47). The mag link (53) is attached to the mechanism frame (41
) is rotatably supported by a shaft (54), one end (53a) of which is connected to the shaft (28a) of the core holder (28).
is engaged with. The center part of the contact lever (55) is connected to one end (53b) of the mag link (53) by a pin (56).
), and one end (55a) thereof is engaged with a substantially x-shaped engaging portion (51A) formed in the hollow portion of the push plate (51). FIG. 6 is a perspective view showing the contact lever (55) and crossbar (9). Contact lever (55
) is engaged with the pin (57), and the other end (55b) of the pin (57) is engaged with the pin (57)
7) and the engagement groove (9) of the cross bar (9).
b) is engaged, the contact lever (55
) and the crossbar (9) are engaged.

Returning to FIG. 7, an overcurrent tripping section (500) is arranged on the front side of the base (1b). Yoke (
58) is press-fitted into the groove (1e) (FIG. 8) of the base (1b). The pipe portion (59) is soldered to the yoke (58). The tripping coil (60) has a pipe section (
59), a load side terminal (61) is welded to one end (60a), and a connecting conductor (62) is welded to the other end (60b). Load side terminal (61
) is press-fitted into the base (1b) and has a terminal screw (4) for connecting an external line. The connecting conductor (62) is a screw (63)
is fixed to the load side stator (13). The coil end (64) positions the tripping coil (60) between the pipe section (59) and the yoke (58). Movable piece (65)
It is biased clockwise by a pull spring (66). A latch (49) is located to the right of the tip (65a) of the movable piece (65).
) is disposed across the three poles. The insulation barrier (68) is the base (1b)
is inserted into the groove (1f) (Fig. 8).

Next, the operation of the above embodiment will be explained based on FIGS. 1 to 4. First, the off state of the handle (43) shown in FIG. 1 will be explained. In the off state, the mag link (
The clockwise moment M1 around the shaft (54) given to the magnet (53) is increased by the counterclockwise moment M2 around the shaft (54) given to the mag link (53) by the conical spring (27) of the electromagnetic part (300). bigger. Therefore, one end (55a) of the contact lever (55) is connected to the push plate (51).
receives an upward force from the engaging portion (51A). On the other hand, the pin (56) receives a downward force from the conical spring (27) via the mag link (53). As a result, the contact lever (55) is connected to its one end (55a) and the pin (55).
6) are forced in opposite directions and are restrained. The mag link (53) is pivotally supported by the shaft (54).
) is also restrained by fixing the position of the pin (56). Therefore, the movable core (26) is the same as the fixed core (22).
It is positioned at a position with a slight gap from When the handle (43) is tilted to the right from the above-mentioned OFF state to the auto position, the link (46) extends (becomes vertical) and the push plate (51) pulls the tension spring (52).
) to release the restraint of the contact lever (55). At this point, the moment M1 of the tension spring (52) becomes zero, so the moment M2 of the conical spring (27)
The mag link (53) rotates counterclockwise around the shaft (54), and the movable iron core (26) connects to the terminal block (30).
(FIG. 5). At the same time, the contact lever (55) also rotates slightly clockwise about the engagement part (51A), so the crossbar (9
) moves upward, and the separation distance between the power supply side fixed contact (5) and the power supply side movable contact (7) and between the load side fixed contact (12) and the load side movable contact (8) is It will decrease slightly.

In the automatic handle position shown in FIG. 2, the limit switch (39) is turned on by the actuator (39A) (FIG. 8) which detects the movement of the push plate (51). When voltage is applied to the control terminal (33) (Fig. 7) from the outside,
The electromagnetic coil (25) is excited and the movable iron core (26) is attracted downward. During suction, the protrusion (35Aa) of the actuator (35A) is pushed downward by the protrusion (28a) of the core holder (28) and rotated to switch the changeover switch (35) (see FIG. 5). Electronic circuit department (38
) converts the current flowing through the electromagnetic coil (25) during the suction process into full-wave rectification until the changeover switch (35) is switched, half-wave rectification after the changeover, and DC current flowing into the movable iron core (25).
6) has the effect of attracting and holding. The magnet link (53) rotates clockwise due to the suction, and in conjunction therewith, the contact lever (55) rotates clockwise about the engagement portion (51A) as a fulcrum. As the contact lever (55) rotates, the movable element (6) rises via the crossbar (9), and the power supply side movable contact (7) and the load side movable contact (8) are respectively connected to the power supply side fixed contact (5). and load side fixed contact (8)
The contact pressure is obtained by the push spring (11). FIG. 3 shows this excitation state with the handle auto. The impact force of the movable iron core (26) on the fixed iron core (22) is alleviated by the leaf spring (23) (FIG. 5).

Next, in FIG. 3, the control terminal (33) (
When the voltage application to Fig. 7) is turned off, the movable iron core (26) is moved upward by the conical spring (27), and the magnetic link (
53) rotates counterclockwise. Therefore, the contact lever (55) rotates counterclockwise about the engaging portion (51A) as a fulcrum. As a result, the crossbar (9) is lowered, and each movable contact (7, 8) is connected to a fixed contact (5, 1), respectively.
2) and returns to the state shown in FIG. In this way, operations between the state shown in FIG. 2 and the state shown in FIG. 3 are performed alternately in response to remote control, and the contacts are opened and closed. In the state where the contacts are closed as shown in FIG. 3, the current flows sequentially from the power supply side terminal (2) as shown in FIG. The flow passes through the load-side movable contact (8), the load-side fixed contact (12), the load-side stator (13), the connecting conductor (62), and the tripping coil (60) to the load-side terminal (61).

In FIG. 3, when an overcurrent or short circuit current flows, the movable piece (65) rotates counterclockwise, pushes the trip bar (67) to the right with its tip (65a), and closes the latch (49). ) clockwise. As a result, the lever (48) is disengaged from the latch (49), and as shown in FIG.
52) pushes the roller (47) to the left side together with the lever (48) and raises the contact lever (55) counterclockwise about the pin (56). Thereby, the mover (6) is connected via the crossbar (9).
lowers and connects each movable contact (7, 8) to each fixed contact (5, 1).
2), respectively. At this time, at the same time, the push plate (
51), the actuator (39A) rotates counterclockwise, the limit switch (39) also opens, and the electromagnetic coil (25) is no longer excited. Therefore, the movable iron core (26) tries to move upward by the conical spring (27), but the tension spring (52) against the shaft (54)
The moment M1 of the shaft (54) caused by the conical spring (27)
Since the moment M2 is larger than the moment M2, the mag link (
53) remains in the position shown in FIG. 1, and the movable iron core (26) only rises slightly and immediately stops. In addition, the handle (43
) is a torsion spring (not shown) centered on the shaft (44).
The roller (47
) is pushed away to the left together with the link (46), the handle (43) is released from its restraint, rotates counterclockwise, and enters the handle-off state. Along with the movement of this handle (43), the lever (48)
pushes the roller (47) to the right and engages the latch (49) while resting on the push plate (51), completing the reset operation. That is, when an overcurrent or short-circuit current flows and trips, the state shown in FIG. 4 occurs, but this state is temporary and the handle-off state shown in FIG. 1 is returned immediately thereafter.

[0022]

As described above, according to the present invention, the contact lever whose point of action is linked to the contact part is not fixed to the case of the circuit breaker, but the link lever (which has one end connected to the electromagnet)
The other end of the magnet link is pivotally supported and driven, and the fulcrum is held by a push plate while allowing some rotation, so that the source of the force that opposes the force of the electromagnet is reduced to a single spring. (27), the influence on the electromagnet due to variations in the individual characteristics of the springs is minimized. In addition, with the above configuration, the link lever and contact lever move as if they were almost one body during normal on/off operations, so the friction between the link lever and its shaft is extremely small, which reduces the transmission of force. Loss will be reduced. Therefore, the load on the electromagnet is reduced and the operating voltage of the electromagnet can be lowered.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing a remotely controlled circuit breaker according to an embodiment of the present invention in a remote controlled off state with the handle off;

[Figure 2] Schematic side view of the circuit breaker showing the state in which the handle is turned off automatically and remotely controlled.

[Figure 3] Schematic side view of the circuit breaker showing the state in which the handle is auto and the remote control is on.

[Figure 4] Schematic side view showing the state of the circuit breaker when tripped

[
Figure 5: A perspective view showing the detailed configuration of the electromagnetic part of the circuit breaker

[Figure 6] A perspective view showing the crossbar and nearby parts of the circuit breaker.

[Figure 7] Side sectional view of the circuit breaker in the same state as Figure 1

[
Figure 8: Front view of the circuit breaker with the front cover partially removed

[Figure 9] Back view of the circuit breaker with the back cover partially removed

FIG. 10 is a schematic side view showing the state of a conventional remote-controlled circuit breaker when the handle is turned off and the remote control is turned off.

[Fig. 11] A schematic side view of a conventional remote-controlled circuit breaker showing a state in which the handle is auto and the remote control is turned off.

[Fig. 12] A schematic side view of a conventional remote-controlled circuit breaker showing a state in which the handle is auto and the remote control is on.

FIG. 13 is a schematic side view showing the trip state of a conventional remote-controlled circuit breaker.

[Explanation of symbols]

1 Case 43 Handle 46 Link 51 Push plate 53 Mag ring 55 Contact lever 100 Contact part 300 Electromagnetic part

Claims (1)

[Claims] Claim 1: A remote-controlled circuit breaker comprising a contact part, a disconnection mechanism linked to the contact part, and a high-frequency switching mechanism housed in the same case, including an electromagnet part and the electromagnet which is pivotally supported from the case. a link lever whose one end is driven by the suction/release operation; a contact lever which is pivotally supported at the other end of the link lever and whose one end is linked to the contact section; and a contact lever which is pivotally supported from the case and whose one end is connected to the contact section. An operating part that has an operating handle and forms a toggle link together with a link connected to the other end, and a mechanism that loosely fits the other end of the contact lever to allow rotation of the contact lever only within a predetermined range. 1. A remote-controlled circuit breaker comprising: a push plate having a mating portion, and one end of which is to be driven by engaging with the toggle link.