JPS6388728A - Electromagnetic breaker - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention prevents overcurrent caused by external operation signals, short circuits, etc.

The present invention relates to an electromagnetic breaker having means for opening and closing a main contact by overload current and manual operation.

[Conventional technology]

In an equipment monitoring device such as a switchboard, an electromagnetic circuit breaker is installed to protect the load from overcurrent or overload. The operation of the electromagnetic circuit breaker is performed by an external electrical operation signal, the current state of the load, and manual operation.

For example, the circuit breaker described in Japanese Patent Application Laid-Open No. 58-103729 has a means for tripping the sudden trip mechanism by means of reacting after a striking operation when a short-circuit current occurs, and another means for tripping the sudden trip mechanism by means of reacting after a striking operation, and another by means of reacting by an instantaneous or long-lasting overload current. and means for tripping the sudden trip mechanism. The tripping operation of the latter sudden trip mechanism indirectly trips the former sudden trip mechanism.

[Problem that the invention seeks to solve]

In the conventional circuit breaker described above, the coil that responds when a short circuit current occurs, the first coil that directly opens the main contact when an overcurrent occurs that corresponds to the maximum rated current of the frame, and the first coil that corresponds to the load container. A second coil is separately provided for deenergizing the electromagnetic coil of the electromagnet when an overcurrent occurs, and these coils are connected in series.

This means that duplicate parts are used for the same accident detection, which has the drawback of increasing the size and making it heavy to stack.

The capacity of the bimetal piece used as an overload detection means varies depending on the motor capacity, but the striking current of the current coil used as an overcurrent detection means is set to about 15 times the maximum rated current of the frame. ing. When a small-capacity motor with a rated current smaller than this striking current value is connected as a load, the impedance of the bimetallic piece and the second coil of the overload relay becomes large, and therefore the overall internal impedance becomes large. Therefore, the short-circuit current is limited by this internal impedance, and there is a region where it becomes smaller than the striking current value and does not strike even if overload occurs, and rapid breaking by direct opening of the main contact (11) is not possible. Ta. Furthermore, in this conventional device, the second coil, the bimetallic piece, and the third sudden trip mechanism are modularized in a removable manner, but the first coil is removed from the range and made replaceable. Therefore, the striking current value is fixed at about 15 times the maximum rated current of the frame. For this reason, for modularized overload detection devices with a structure that allows the capacity to be changed, the manufacturing range of the rated setting current according to the capacity is restricted, making it impossible to manufacture small capacity rated setting current products. There are drawbacks.

The present invention eliminates these drawbacks, achieves the automatic quick-opening function when a short-circuit current occurs with a single coil, reduces the size, weight, and cost of the product, and improves the small capacity rating of the modularized overload detection device. The purpose is to provide an electromagnetic breaker that can be manufactured as a current product.

[Means for solving problems]

In order to achieve this objective, the electromagnetic breaker of the present invention provides overload detection means (
3), an overcurrent detection means (4) such as a current coil (23) and a main contactor (11) are installed in series, and a cough main contactor (11) is installed in series.
) is controlled by an electromagnet (2) connected between the operation terminals (33) and (34) via the operation switch (6).
), and the overcurrent detection means (4)
The operating member +11, which is biased in one direction by a spring (51), has locking means to maintain the main contact (11) in the open state upon actuation of has a portion (95) to hold it;
a third trip mechanism (300) for closing the operating switch (6) in the stable position (A) and said portion (95);
and the operating member (1) is connected to the second trip mechanism (200).
The operating member (1) is connected to the overload detecting means (3) or the overcurrent detecting means (4) to maintain the open stable position (O) given by external means to the operating member (1). ) The pressing force (c1
or a trip stable position (T) that automatically transitions between said automatic stable position (A) and an open stable position (O) when tripped by the first tripping mechanism (100) tripped by +d+; is provided, and the first trip mechanism (100) has a main contact (11
) and is tripped directly by the action +d+ exerted by a first lever (41) responsive to a striker (24) driven by the excitation of a current coil (23) arranged in series with the The trip mechanism (100) of No. 1 includes a main contactor (11) and a current coil (2
The second trip mechanism (200) is configured to be tripped directly by the operation (c1) provided by the overload detection means (3) provided in series with the trip mechanism (3).
The trip mechanism (100) and (200) are configured to be indirectly tripped by the trip operation of the operation member +
11 is moved by external means to the reset operation (R) located opposite the stable position (A), the operating member (1
It is characterized in that it receives reset operations (T) and (T') given by 1.

[Effect]

In the present invention, when a striking operation is performed when a short circuit current occurs, the - piece (71) of the first lever (41)
Then, open the main movable contact (12) and move the second lever (
42) to maintain the open position. At the same time, the other piece (72) of the first lever (41)
3) to trip the first trip mechanism (100).

An overload current that persists for a long time causes the overload detection means (3), such as a bimetal (22), to trip the trip mechanism (100) through the third lever (43).

When a short-circuit current occurs, the first trip mechanism (100) is tripped by causing the first trip mechanism (100) to trip before the first lever (41) presses the movable ring (14).
Ensure certainty near the striking operating point. In addition, the overload detection means (3), the overcurrent detection means (4), the first
trip mechanism (100) of the same protection module (5)
By incorporating it into the system, it becomes easy to make adjustments such as the reliability of operation. Additionally, modularization makes it easier to respond to changes in capacity.

By setting the striking current value of the current coil (23) to about 15 times the rated setting current of the overload detection means (3), it can be made smaller than the short circuit current limited by the internal impedance, and the striking operation is ensured. become.

〔Example〕

Hereinafter, the present invention will be specifically described based on embodiments shown in the drawings.

FIG. 1 is an electromechanical diagram schematically showing the configuration of an electric IF circuit breaker according to the present invention. In FIG. 1, (11 is an operating member, which is biased in the S direction by a spring (51). The load such as a motor is connected to the main circuit terminal (31).
), connected to the power supply via (32) and terminal (31)
, (32) Between the heater (21) and the bimetal (22)
) overload detection means (3), overcurrent detection means (4) comprising a current coil (23) from which a striker (24) protrudes due to overcurrent, and! Main contacts (11), which are opened by the operation of the magnet (2), are connected in series. The electromagnet (2) is connected between operation terminals (33) and (34), with an operation switch (6) consisting of a movable contact (19), a fixed contact (20) and a biasing spring (52) interposed therebetween. There is. The main contactor (11) consists of a main movable contactor (12) and a main fixed contactor (13), and is opened and closed by a movable rod (14) having a tension spring (53). The movable rod (14) is connected to the movable core (16) of the electromagnet (2) by a crossbar (15), and is normally attached to close the main contact (11) by a pressing spring (54). Forced. The movable iron core (16) cooperates with the fixed iron core (17) and is attracted.

The main contact n''F (11) is also opened by the retaining part (71) at the tip of the first lever (41) pushing down the movable rod (14) against the pressing force of the spring (55). This opening operation is performed when the striker (24) protrudes by energizing the current coil (23), and when the first lever (41) rotates, its tip (7)
2) pushes up the third lever (43) via the pusher (29). When the first lever (41) rotates clockwise in the drawing, the first lever (41) and the second lever (
42) retaining part (73) and (c) are springs (56)
The second lever (42) rotates counterclockwise in the drawing, locks the operating state of the first lever (41), and therefore opens the main contact (11). Hold open. The operation of pushing up the third lever (43) is also performed in parallel when the bimetal (22) raises the pusher (30) due to the operation of the overload detection means (3).

As the third lever (43) rises, the fourth lever (43) rises.
4) is pressed, and the fourth lever (44) is pressed.
) rotates counterclockwise against the biasing force of the spring (57), the fifth lever (45
) is released, and the fifth lever (45) is raised by the biasing force of the spring (58). The fifth lever (45) presses the end (77) of the sixth lever (46) and rotates the sixth lever (46) counterclockwise against the biasing force of the spring (59). Then, release the lock by the locking part (78) and release the seventh lever (47) with the spring (
60) is raised by the urging force. The seventh lever (47
) rises, the retaining part (79) causes the eighth lever (
48) is rotated counterclockwise, and the eighth lever (48)
The movable contact (19) of the operation switch (6) is opened by the tip (81), and the opening/closing operation of the main contact (11) due to energization of the 1i magnet (2) is suppressed. When the eighth lever (48) is rotated counterclockwise, its protrusion (82)
) and the inclined part (95) of the operating member +11 are no longer engaged,
The operating member fi+ is moved in the S direction by the spring (51) and moved to the T position with respect to the pointer (10).
prevents the eighth lever (48) from returning.

Operation parts! 11, there is a second lever at the time of reset operation.
Rotate the tip of (42) downward to release the second lever (42).
2), a sloped portion (92) that locks the tip of the seventh lever (47) to limit the movement of the operating member (11) when tripping, and
an inclined portion (93) that the tip of the seventh lever (47) comes into contact with to limit further movement of the operating member (11); and the inclined portion (93) that maintains the tip of the seventh lever (47) in a pressed state during a reset operation. A step portion (94) continuous with the portion (93) is formed together with the inclined portions (95) and (96).

Next, the operation in each case will be explained.

(al) The main contact (
11) is turned on and off.

(bl Operation member (1) (handle) A (AUTO
, automatic position): moving the operating member (1) to position A by external force. It is held by the protrusion (82) of the eighth lever (48) and the inclined portion (95) of the operating member (11).

At this time, it is pressed by a spring (51).

At this time, the operation switch (6) is on and the operation is normal.

0 (OPEN, open position): Operation member (1
) to position 0. The tip of the seventh lever (47) (
80) and the inclined portion (93) of the operating member (11).

At this time, the operation switch (6) is off and the operation is i.

T (TRIP; ) lip position): Provided by the trip operation of the second trip mechanism (200) when an overload or short circuit occurs. The operation (b, b'') causes the third trip mechanism (300) to trip and the operating member (11
moves in the S direction. Then, it is held at the position of the tip (80) of the seventh lever (47) and the inclined portion (92) of the operating member (11).

At this time, the operation switch (6) is off and the operation is i.

R (RESf!T, reset position): Move the operating member il+ to position R by external force. Movement (T) provided by the inclined portion (93) and stepped portion (94) of the operating member +11.

T', T'), the first and second trip mechanisms (
100), (200) and retaining parts (73), (74
) is reset.

At this time, the operation switch (6) is off and the operation is i.

Between T and 0: The ninth lever (49) and the inclined part (96) of the operating member fil work together to move from the T position to the 0 position, and at the same time press the - piece of the crossbar (15) to Contact (1
1) Forcibly open.

(e) Current coil (2) when short circuit current or overload current occurs
3), a short circuit current flows through it, it is excited, and the striker (24)
hits the first lever (41), the first lever (41)
) presses the third lever (43),
At the same time as tripping the first trip mechanism (100), locking is performed in cooperation with the retaining portion (73) of the first lever (41) and the retaining portion (74) of the second lever (42). , and hold the main contacts (11) in an open state.

When overload current flows continuously, overload detection means (3)
presses the third lever (43) to trip the first trip mechanism (100). The first trip mechanism (
100) trips, the third trip mechanism (30
G) trips, the operation switch (6) turns off,
The electromagnet (2) is de-energized and opened. By opening the electromagnet (2), the movable iron core (16) opens, and the crossbar (
15) acts in a direction to push down the main contactor (11) via the movable ring (14).

〔Effect of the invention〕

As explained above, in the present invention, only one current coil is provided which responds when a short circuit current occurs, and this is configured to perform both the trip operation and the main contact opening operation. Therefore, the overall shape can be made smaller and lighter. Automatic rapid opening operation of the main contact can be ensured even at the rated setting current for light and small capacity loads.

Furthermore, by preparing modules with different current coil winding specifications and selecting and using the modules according to the capacity of the load, we can provide an electric M1 circuit breaker that supports loads with small capacity rated current. can do.

[Brief explanation of the drawing]

FIG. 1 is an electromechanical diagram showing an embodiment of the present invention. (1): Operation member (2): Electromagnet (3): Overload detection means (4): Overcurrent detection means (5): Protection module (6): Operation switch (10)! Pointer (11) : Main contact (12) n Main movable contact (13) j Main fixed contact (14) : Movable ring (15) : Crossbar (16) : Movable core (17) : Fixed core (19) )? Movable contact (20): Fixed contact (21): Heater (22)? Bimetal (23)? Current coil (24) Nist striker (31), (32
): Main circuit terminal (33), (34): Operation terminal (41): First lever (42): Second lever (43)! 3rd lever (44): 4th lever (45): 5th lever (46): 6th lever (47): 7th lever (4B): 8th lever
Lever (49): Ninth lever

Claims (1)

[Claims] 1. Overload detection means (3), overcurrent detection means (such as a current coil (23)) between the main circuit connection terminals (31) and (32)
4) and a main contactor (11) are installed in series, and the opening and closing of the main contactor (11) is controlled by an electromagnet connected between the operation terminals (33) and (34) via an operation switch (6). (
2), and the overcurrent detection means (4)
), the operating member (1), biased in one direction by a spring (51), has locking means for maintaining the main contact (11) in the open state upon actuation of the (A) has a portion (95) to hold it;
a third trip mechanism (300) for closing the operating switch (6) in the stable position (A) and said portion (95);
and the operating member (1) is arranged to cooperate with the second tripping mechanism (200) to maintain the open stable position (O) imparted to the operating member (1) by external means. , furthermore, the operation member (1) has a first trip mechanism (100 ), the automatic stable position (A) and the open stable position (
Trip stable position (T) that automatically shifts between
is provided, and the first trip mechanism (100) has a main contact (11
) and is tripped directly by the action (d) exerted by the first lever (41) in response to a striker (24) driven by the excitation of a current coil (23) arranged in series with the The first trip mechanism (100) includes a main contact (11) and a current coil (2).
The second tripping mechanism (200) is configured to be tripped directly by the operation (c) provided by the overload detection means (3) provided in series with the tripping mechanism (200).
The tripping mechanisms (100) and (200) are configured to be indirectly tripped by the tripping operation of the operating member (100).
The operating member (1) is moved by external means to the reset position (R) located opposite the stable position (A).
), the reset operation given by (@b@), (@b@
'). 2. After the overcurrent detection means operates, the reset operation (@f@') applied to the second lever (42) that holds the main movable contact (12) in the open position is transmitted by the operating member (1). An electromagnetic breaker according to claim 1, characterized in that: 3. The first trip mechanism (100) has a current coil (2
Claim 1, characterized in that the first lever (41) responsive to the excitation of 3) trips before pressing the movable rod (14) holding the main movable contact (12). The electromagnetic breaker according to item 2 or item 2. 4. Multiple overload detection means (3), overcurrent detection means (4)
) and a first trip mechanism (100). 5. The motion transmission means (49) includes the movable iron core (16) or the crossbar (15) and the inclined portion (96) of the operating member (1).
Claim 1, characterized in that the main movable contact (12) is forcibly opened between positions (A) and (O) of the operating member (1) in conjunction with the operation member (1). The electromagnetic breaker according to any one of Items 4 to 4.