Miniature breaker having short circuit self-locking function and miniature breaker having position state detecting function

• US 9,509,130 B2
• Filed: 12/17/2010
• Issued: 11/29/2016
• Est. Priority Date: 10/18/2010
• Status: Active Grant

• Current Assignee: Hubei Shengjia Wiring Co., Ltd.
• Original Assignee: Hubei Shengjia Wiring Co., Ltd.
• Inventors: Wan, Jiasheng
• Primary Examiner(s): Tran, Thienvu
• Assistant Examiner(s): MAI, TIEN HUNG
• Application Number:
  US13/880,357
• Publication Number:
  US 20150029633A1
• Time in Patent Office: 2,174 Days
• US Class Current: 1/1
• CPC Class Codes: H01H 2003/266 having control circuits for motor operating switches, e.g. controlling the opening or closing speed of the contacts
• CPC Class Codes: H01H 2071/0285 Provisions for an intermediate device between two adjacent circuit breakers having the same general contour but an auxiliary function, e.g. cooling, isolation, wire guiding, magnetic isolation or screening
• CPC Class Codes: H01H 3/26 using dynamo-electric motor for storing energy in a spring motor H01H3/30
• CPC Class Codes: H01H 71/1018 with only external interconnections
• CPC Class Codes: H01H 71/1027 comprising a bidirectional connecting member actuated by the opening movement of one pole to trip a neighbour pole
• CPC Class Codes: H01H 71/70 actuated by electric motor
• CPC Class Codes: H02H 3/08 responsive to excess current responsive to abnormal temperature caused by excess current H02H5/04

Abstract

Both a miniature circuit breaker with short-circuit self-locking function and a miniature circuit breaker with position state detection function include: a first miniature circuit and a miniature circuit breaker operation output device. A motor, an action unit and a control unit are located within the casing of the miniature circuit breaker operation output device. The motor outputs a torque, the action unit obtains the torque and the torque is converted into the closing or breaking operation of the first miniature circuit breaker, the control unit controls the rotation and stop of the motor. A position state detection mechanism is located within the casing of the miniature circuit breaker operation output device of the miniature circuit breaker with position state detection function and triggers the control unit to stop the motor when the closing or breaking operation of the first miniature circuit breaker reaches the specified position.

Claims

1. A miniature circuit breaker with short-circuit self-locking function, comprising a first miniature circuit breaker and a miniature circuit breaker operation output device, wherein,

the first miniature circuit breaker is located on a power line for generating a breaking action when a short-circuit fault occurs;

the miniature circuit breaker operation output device comprises;

a casing, in the casing, there are;

a motor for outputting a torque;

an action unit for obtaining the torque outputted by the motor and transferring the obtained torque to a closing action or the breaking action of the first miniature circuit breaker;

a control unit for controlling a rotation and stop of the motor; and

a short-circuit protection linkage unit, wherein when the first miniature circuit breaker generates the breaking action due to the short-circuit fault, the short-circuit protection linkage unit sends an action signal to the control unit for the control unit stopping the motor after the short-circuit of the first miniature circuit breaker,

wherein the control unit comprises;

a power conversion circuit, wherein a voltage signal is obtained from a phase line L by the power conversion circuit and then rectified, filtered and reduced and a power is supplied for electrical components of the control unit;

a position detection circuit which sends a first control signal when the miniature circuit breaker is detected to reach a target position; and

a trigger component which obtains the first control signal for triggering the rotation or stop of the motor,

wherein the position detection circuit comprises;

a first limit switch, wherein one end thereof is connected with ground and is triggered by a position detection mechanism; and

a microprocessor connected with the first limit switch and outputs the first control signal when a state of the first limit switch is changed;

wherein, the position detection mechanism comprises;

a first trigger bar, wherein a first end of the first trigger bar is hinged within the casing of the miniature circuit breaker operation output device by a hinged shaft, an extending bar having a same direction with the hinged shaft is located at a second end of the first trigger bar and the second end is located on the first limit switch;

a first arched groove provided on the casing of the miniature circuit breaker operation output device, wherein the extending bar extends outside the casing of the miniature circuit breaker operation output device; and

a second arched groove provided on a casing of the first miniature circuit breaker, wherein the extending bar extends into the first arched groove and is combined with a linkage mechanism of the first miniature circuit breaker;

wherein the trigger component is a first triode, a base thereof is connected with the other end of the first limit switch, an emitter thereof is connected with ground, and a collector thereof is connected with the motor.

2. The miniature circuit breaker with short-circuit self-locking function, as recited in claim 1, characterized in that, the short-circuit protection linkage unit comprises:

a second limit switch, wherein one end thereof is connected with ground and the second limit switch is triggered by a short-circuit detection mechanism; and

the microprocessor connected with the second limit switch and outputting and maintaining the first control signal when a state of the second limit switch is changed, wherein the short-circuit detection mechanism comprises;

a short-circuit detection lever, hinged within the casing of the miniature circuit breaker operation output device, wherein one end of the short-circuit detection lever extends outside the casing, the second limit switch is triggered by the short-circuit detection lever when the short-circuit detection lever rotates; and

a reset spring located at the hinged shaft for resetting the short-circuit detection lever.

3. A miniature circuit breaker with short-circuit self-locking function, characterized in that, which comprises:

a first miniature circuit breaker and a miniature circuit breaker operation output device, wherein,

the first miniature circuit breaker is located on a power line for generating a breaking action when a short-circuit fault occurs;

the miniature circuit breaker operation output device comprises;

a casing, in the casing, there are;

a motor for outputting a torque;

an action unit for obtaining the torque outputted by the motor and transferring the obtained torque to a closing action or the breaking action of the first miniature circuit breaker;

a control unit for controlling a rotation and stop of the motor; and

a short-circuit protection linkage unit, wherein when the first miniature circuit breaker generates the breaking action due to the short-circuit fault, the short-circuit protection linkage unit sends an action signal to the control unit for the control unit stopping the motor after the short-circuit of the first miniature circuit breaker;

wherein the control unit comprises;

a power conversion circuit, wherein a voltage signal is obtained from a phase line L by the power conversion circuit and then rectified, filtered and reduced and a power is supplied for electrical components of the control unit;

a position detection circuit which sends a first control signal when the miniature circuit breaker is detected to reach a target position; and

a trigger component which obtains the first control signal for triggering the rotation or stop of the motor,

wherein the position detection circuit comprises;

a first limit switch, wherein one end thereof is connected with ground and the first limit switch is triggered by a position detection mechanism, wherein the position detection mechanism comprises;

a first trigger bar, wherein a first end of the first trigger bar is hinged within the casing of the miniature circuit breaker operation output device by a hinged shaft, an extending bar having a same direction with the hinged shaft is located at a second end of the first trigger bar and the second end is located on the first limit switch;

a first arched groove provided on the casing of the miniature circuit breaker operation output device, wherein the extending bar extends outside the casing of the miniature circuit breaker operation output device; and

a second arched groove provided on a casing of the first miniature circuit breaker, wherein the extending bar extends into the first arched groove and is combined with a linkage mechanism of the first miniature circuit breaker;

wherein the trigger component is a first triode, a base thereof is connected with the other end of the first limit switch, an emitter thereof is connected with ground, and a collector thereof is connected with the motor.

4. The miniature circuit breaker with short-circuit self-locking function, as recited in claim 3, characterized in that, the short-circuit protection linkage unit comprises:

a second triode, wherein an emitter thereof is connected with ground, a collector thereof is connected with the base of the first triode; and

a second limit switch connected with a base of the second triode and triggered by a short-circuit detection mechanism,

wherein the short-circuit detection mechanism comprises;

a second linkage shaft, wherein one end of the second linkage shaft is fixedly located on a short-circuit self-locking action mechanism of at least one miniature circuit breaker, the second linkage shaft extends outside a slot at a side of the miniature circuit breaker into the casing and is located on the second limit switch.

5. The miniature circuit breaker with short-circuit self-locking function, as recited in claim 4, characterized in that, further comprises:

a delay circuit comprising a first capacitor, wherein one end of the first capacitor is connected with the base of the first triode, the other end thereof is connected with ground;

a discharge resistor, wherein one end of the discharge resistor is connected with the base of the first triode, and the other end thereof is connected with ground; and

a zener diode for stabilizing the voltage.

6. The miniature circuit breaker with short-circuit self-locking function, as recited in claim 4, characterized in that, further comprises:

a detection switch located between the power conversion circuit and the phase line for disconnecting a power supply from the phase to the power conversion circuit in need of detection.

7. The miniature circuit breaker with short-circuit self-locking function, as recited in claim 4, characterized in that, the position detection circuit comprises:

an optocoupler, wherein an output terminal of the optocoupler is connected with a control terminal of the trigger component; and

a sample sub-circuit obtaining a voltage signal form the phase line, connected with an input terminal of the optocoupler after rectifying, filtering and stabilizing the voltage signal.

8. The miniature circuit breaker with short-circuit self-locking function, as recited in claim 4, characterized in that, further comprises:

a second miniature circuit breaker, wherein the first miniature circuit breaker and the second miniature circuit breaker are respectively located two sides of the miniature circuit breaker operation output device and the linkage piece is combined with an action mechanism of the second miniature circuit breaker.

9. A miniature circuit breaker with position state detection function, characterized in that, which comprises:

a first miniature circuit breaker and a miniature circuit breaker operation output device, in which,

the first miniature circuit breaker located on the power line for cutting off a current of a circuit where the first miniature circuit breaker is by own closing or breaking action;

the miniature circuit breaker operation output device for controlling the closing or breaking action of the first miniature circuit breaker, wherein the miniature circuit breaker operation output device comprises;

a casing, in the casing, there are;

a motor for outputting a torque;

an action unit for obtaining the torque outputted by the motor and transferring the obtained torque to the closing or breaking action of the first miniature circuit breaker;

a control unit for controlling a rotation and stop of the motor; and

a position state detection unit, wherein when the closing or breaking action of the first miniature circuit breaker reaches a specific position, the control unit is triggered by the position state detection unit for controlling the motor to stop rotating,

wherein the position state detection mechanism comprises;

a first trigger bar, wherein a first end of the first trigger bar is hinged within the casing of the miniature circuit breaker operation output device by a hinged shaft, and an extending bar having a same direction with the hinged shaft is located at a second end of the first trigger bar;

a first arched groove provided on the casing of the miniature circuit breaker operation output device, wherein the extending bar extends outside the casing of the miniature circuit breaker operation output device; and

a second arched groove provided on a casing of the first miniature circuit breaker, wherein the extending bar extends into the first arched groove and is combined with a linkage mechanism of the first miniature circuit breaker.

10. The miniature circuit breaker with position state detection function, as recited in claim 9, characterized in that, further comprises a second miniature circuit breaker, wherein the first miniature circuit breaker and the second miniature circuit breaker are respectively located at two sides of the miniature circuit breaker operation output device, and a linkage piece is combined with an action mechanism of the second miniature circuit breaker.

11. The miniature circuit breaker with position state detection function, as recited in claim 9, characterized in that, the action unit comprises:

a rotation portion, a hand setting portion and a linkage piece, wherein, the rotation portion obtains the torque outputted by the motor; and

the hand setting portion is a shift lever fixedly placed on the rotation portion.

12. The miniature circuit breaker with position state detection function, as recited in claim 11, characterized in that, the rotation portion is a disc connected with an output shaft of the motor;

or the rotation is a worm gear disc engaged with a worm placed on an output shaft of the motor.

13. The miniature circuit breaker with position state detection function, as recited in claim 11, characterized in that, the linkage piece comprises:

a handle portion pivotally connected within the casing, wherein a top portion of the handle portion extends outside the casing, and a low-end extended section of the handle portion leans against the hand setting portion; and

a linkage portion sleevedly provided on the handle portion and a top portion of the handle of one of the first miniature circuit breaker and the second miniature circuit breaker.

14. The miniature circuit breaker with position state detection function, as recited in claim 11, characterized in that, the linkage piece comprises:

a rotation portion pivotally connected within the casing, and having a linkage bond placed hole, wherein a lower end of the rotation portion leans against the hand setting portion; and

a linkage portion sleevedly provided on the handle portion and an upper portion of the handle of one of the first miniature circuit breaker and the second miniature circuit breaker.

15. The miniature circuit breaker with position state detection function, as recited in claim 11, characterized in that, the control unit comprises:

a power conversion circuit, wherein a voltage signal is obtained from a phase line by the power conversion circuit, and then rectified, filtered for providing electrical components of the control unit with power;

a position detection circuit which sends a first control signal when the miniature circuit breaker is detected to reach a target position; and

a trigger component which obtains the first control signal for triggering the rotation or stop of the motor.

16. The miniature circuit breaker with position state detection function, as recited in claim 15, characterized in that, the position detection circuit comprises:

a first limit switch, wherein one end thereof is connected with ground and is triggered by the position detection mechanism;

or the position detection circuit comprises;

an optocoupler, wherein an output terminal of the optocoupler is connected with a control terminal of the trigger component; and

a sample sub-circuit obtaining a voltage signal form the phase line, connected with an input terminal of the optocoupler after rectifying, filtering and stabilizing the voltage signal.

17. The miniature circuit breaker with position state detection function, as recited in claim 15, characterized in that, the trigger component is a first triode, a base thereof is connected with the other end of the first limit switch, an emitter thereof is connected with ground, and a collector thereof is connected with the motor.

18. The miniature circuit breaker with position state detection function, as recited in claim 15, characterized in that, further comprises:

a detection switch located between the power conversion circuit and the phase line for disconnecting a power supply from the phase to the power conversion circuit in need of detection.