Circuit breaker tripping device with multi-mode triggering and circuit breaker thereof

Abstract

The breaker tripping device is composed of a thermal tripper, a magnetic tripper, an electronic tripper, a mounting bracket and a special tripper, the electronic tripper is connected with a main circuit through a current sensor, the mounting bracket is provided with a mounting hole and a clamping groove, and the special tripper is arranged in the mounting hole. The thermal tripper, the magnetic tripper and the electronic tripper are all installed on the clamping groove. According to the invention, a plurality of tripping modes are mutually complemented and integrated together, the structure is simple and reasonable, the occupied space is small, the adaptability is strong, even if a certain tripping mode fails, other modes can still work normally, reliable breaking of the circuit breaker at a critical moment is ensured, the protection failure caused by a single fault is avoided, and the reliability of the whole system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and in particular to a circuit breaker tripping device with multi-mode triggering. Background Art

[0002] At present, the tripping device of the thermal-magnetic molded case circuit breaker consists of a traction rod installed on the mechanism part and a thermal release and a magnetic release installed on the conductor part, which realize the circuit breaker's short-circuit instantaneous protection and overload long-delay protection functions; the tripping device of the electronic molded case circuit breaker mainly consists of a control circuit board and its supporting electronic release, which realizes the circuit breaker's short-circuit instantaneous protection, short-circuit short-delay, overload long-delay and other protection functions. The difference in the operating principles of the two products leads to significant differences in the main structural parts of the circuit breaker. In actual applications, if it is necessary to replace a thermal-magnetic molded case circuit breaker with an electronic molded case circuit breaker, it may be necessary to make major changes to the entire power distribution system, increasing the cost and difficulty of the transformation. Due to the different main structural parts, different molds and parts need to be prepared separately during the production process, which increases the complexity and cost of production management and also causes a certain amount of resource waste. Summary of the Invention

[0003] The present invention provides a circuit breaker tripping device with multi-mode triggering, which integrates multiple tripping mode structures together, has a simple and reasonable structure, occupies a small space, and has strong adaptability.

[0004] =To solve the above problems, the present invention adopts the following technical solutions.

[0005] A circuit breaker tripping device with multi-mode triggering consists of a thermal tripper, a magnetic tripper, an electronic tripper, a mounting bracket, and a special tripper. The electronic tripper is controlled by an electronic controller, which is connected to the main circuit via a current sensor. The current sensor converts the current signal in the main circuit into an electrical signal that can be processed by the electronic controller. The mounting bracket is provided with mounting holes and slots. The magnetic tripper and the electronic tripper are both mounted on the mounting bracket. A thermal element is installed close to the main circuit. The thermal element contains a bimetallic strip. The upper end of the bimetallic strip is connected to the trigger mechanism of the special tripper. The electronic controller is provided with a protective shell and is connected to the current sensor via a wire. The free end of the bimetallic strip of the thermal element contacts the trigger mechanism directly or through a transmission component. The thermal element is connected to the conductive plate of the main circuit.

[0006] The trigger mechanism described in the present invention includes a trigger plate, a traction rod, and a slot. The trigger plate and the rotating shaft are integrated. The middle part of the traction rod is provided with a slot. The buckle and the connecting rod are components of the re-locking function mechanism. The end of the buckle is clamped on the outer edge of the slot. The upper part of the buckle is a connecting rod connected to the buckle as a whole. When the traction rod rotates, the slot rotates, and the buckle will slide into the slot. The stability of the re-locking mechanism connected to the buckle is broken, thereby realizing the opening operation. The re-locking mechanism is part of the existing technology and will not be elaborated on in detail.

[0007] The traction rod is further provided with a spring, which applies a force to the traction rod so that the rotating shaft rotates in one direction in a natural state, thereby realizing a reset action of the traction rod after being touched by the tripping device.

[0008] The mounting bracket of the present invention is provided with a tension spring groove, in which a tension spring is installed. The magnetic release includes an instantaneous release plate, a tension spring, and a main conductive plate. One end of the tension spring is connected to the instantaneous release plate, and the other end is connected to the end of the tension spring groove. The main conductive plate is fixed to the lower part of the mounting bracket. The side surface of the instantaneous release plate is in a < shape. Rotating shafts are provided on both sides of the middle part of the instantaneous release plate. The instantaneous release plate is hinged to the mounting bracket through the rotating shaft, and the upper part of the instantaneous release plate is in contact with the trigger plate.

[0009] The upper end of the instantaneous release plate includes a contact plate and a connecting hole. The contact plate is bent toward the front, and its end is in active contact with the trigger plate of the traction rod. The connecting hole is connected to one end of the tension spring.

[0010] A connecting head is also provided in the tension spring groove, and the connecting head can slide back and forth in the tension spring groove. The front end of the connecting head is connected to the other end of the tension spring, and the rear end of the connecting head is provided with a threaded hole. The tension spring groove is provided with a limiting hole, and the screw passes through the limiting hole and is threadedly connected to the connecting head. By rotating the screw, the position of the connecting head in the tension spring groove can be adjusted, thereby limiting the stretching degree of the tension spring, thereby facilitating the adjustment of the tension of the instantaneous release plate, and then adjusting the triggering parameters of the magnetic release.

[0011] Furthermore, the mounting bracket is also provided with a slot II. The two ends of the instantaneous release plate will contact the front and rear edges of the slot II. The slot II is used to limit the swing amplitude of the instantaneous release plate. In the natural state, under the action of the tension spring, the back sides of the two end sides of the instantaneous release plate contact the rear edge of the slot II. When the main circuit is short-circuited, after the instantaneous release plate swings, the front sides of its two end sides contact the front edge of the slot II and are limited.

[0012] The circuit breaker with the above-mentioned trip device includes a base and a trip device. The base is provided with a main conductive plate. The main conductive plate has an L-shaped structure, including vertical sides and right-angled corners. The lower end of the bimetallic strip is in contact with and fixedly connected to the vertical sides to sense the temperature of the main conductive plate. The right-angled corner is close to the lower portion of the instantaneous release plate. When the main conductive plate generates a short-circuit current, a strong magnetic field is generated, thereby attracting the lower portion of the instantaneous release plate, causing the instantaneous release plate to flip, and its contact plate thereby contacting the draw bar.

[0013] The present invention further comprises a reset spring, one end of which is connected to the trigger mechanism, and the other end is connected to the base. The reset spring can reset the trigger mechanism.

[0014] This tripping device has three modes and can flexibly and reliably protect the circuit according to different fault conditions of the main circuit, ensuring the stable operation of the circuit system.

[0015] The beneficial effects of the present invention are: 1. It integrates three modes of thermal tripping, magnetic tripping and electronic tripping, and can realize multiple protection functions such as short-circuit instantaneous, short-circuit short delay, overload long delay, etc. Thermal tripping is for overload, magnetic tripping is for short circuit, and electronic tripping can flexibly set a variety of protection parameters, accurately match different circuit requirements, and effectively protect the safety of circuits and equipment. 2. Multiple tripping modes complement each other. Even if a certain tripping mode fails, other modes can still work normally, ensuring that the circuit breaker can be reliably disconnected at critical moments, avoiding protection failure due to a single fault, and improving the reliability of the overall system. 3. The various components are arranged in an orderly manner through the installation bracket, with a simple structure and reasonable design, so that the structure of the entire tripping mechanism is compact and stable, occupies a small space, is easy to install and use in various electrical equipment, and improves adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the trigger mechanism structure of the present invention.

[0018] Figure 3 This is a schematic structural diagram of the instantaneous release plate of the present invention.

[0019] Figure 4 This is a structural diagram of the tension spring of the instantaneous release plate of the present invention. In the figure, thermal release 1, magnetic release 2, electronic release 3, mounting bracket 4, traction rod 5, trigger plate 6, rotating shaft 7, card slot 8, connecting rod 10, tension spring slot 11, tension spring 12, instantaneous release plate 13, main conductive plate 14, connector 15, vertical edge 16, right-angle corner 17, screw 18, contact plate 19, card slot II 20. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] A circuit breaker tripping device with multi-mode triggering comprises a thermal tripper 1, a magnetic tripper 2, an electronic tripper 3, a mounting bracket 4, and a drawbar 5. The electronic tripper 3 is controlled by an electronic controller, which is connected to the main circuit via a current sensor. The current sensor converts the current signal in the main circuit into an electrical signal that can be processed by the electronic controller. The electronic tripper 3 has a functional structure according to the prior art. The mounting bracket 4 is provided with a mounting hole and a slot. The magnetic tripper 2 and the electronic tripper 3 are both mounted on the mounting bracket. A thermal element is mounted near the main circuit. The thermal element contains a bimetallic strip and is connected to the trigger mechanism of the dedicated tripper 5. The electronic controller is provided with a protective housing and is connected to the current sensor via a wire. The free end of the bimetallic strip of the thermal element is a screw, the end of which contacts the trigger mechanism.

[0022] The trigger mechanism described in the present invention is a traction rod, which includes a trigger plate 6, a rotating shaft 7, and a slot 8. The trigger plate 6 and the rotating shaft 7 are arranged as an integral whole. A slot 8 is provided in the middle of the traction rod. The buckle 9 and the connecting rod are components of the re-locking function mechanism. The end of the buckle is clamped on the outer edge of the slot 8. The upper part of the buckle 9 is a connecting rod 10 integrally connected to the buckle. When the traction rod rotates, the slot 8 rotates, and the buckle will slide into the slot, and the stability of the re-locking mechanism connected to the buckle will be broken, thereby realizing the opening operation. The re-locking mechanism is part of the existing technology and will not be elaborated in detail.

[0023] The traction rod is further provided with a spring, which applies a force to the traction rod so that the rotating shaft rotates in one direction in a natural state, thereby realizing a reset action of the traction rod after being touched by the tripping device.

[0024] The mounting bracket 4 of the present invention is provided with a tension spring slot 11, in which a tension spring 12 is installed. The magnetic release includes an instantaneous release plate 13, a tension spring 12, and a main conductive plate 14. One end of the tension spring 11 is connected to the instantaneous release plate 13, and the other end is connected to the end of the tension spring slot 11. The main conductive plate 14 is fixed to the lower part of the mounting bracket 4. The side of the instantaneous release plate 13 is in a < shape. A rotating shaft is provided on both sides of the middle part of the instantaneous release plate 13. The instantaneous release plate 13 is hingedly connected to the mounting bracket 4 through the rotating shaft, and the upper part of the instantaneous release plate 13 is in contact with the trigger plate 6.

[0025] The upper end of the instantaneous release plate includes a contact plate 19 and a connecting hole. The contact plate 19 is bent toward the front, and its end is in active contact with the trigger plate 6 of the traction rod. The connecting hole is connected to one end of the tension spring.

[0026] A connector 15 is also provided in the tension spring slot 11. The connector can slide back and forth in the tension spring slot. The front end of the connector is connected to the other end of the tension spring, and the rear end of the connector is provided with a threaded hole. The tension spring slot is provided with a limiting hole. The screw 18 passes through the limiting hole and is threadedly connected to the connector. By rotating the screw, the position of the connector in the tension spring slot can be adjusted, thereby limiting the stretching degree of the tension spring, thereby facilitating the adjustment of the tension of the instantaneous release plate 13, and then adjusting the triggering parameters of the magnetic release.

[0027] Furthermore, the mounting bracket is also provided with a slot II 20. The two ends of the instantaneous release plate 13 will contact the front and rear edges of the slot II. The slot II is used to limit the swing amplitude of the instantaneous release plate 13. In the natural state, under the action of the tension spring, the back sides of the two end sides of the instantaneous release plate 13 contact the rear edge of the slot II. When the main circuit is short-circuited, after the instantaneous release plate 13 swings, the front sides of its two end sides contact the front edge of the slot II and are limited.

[0028] The circuit breaker with the above-mentioned trip device includes a base and a trip device. The base is provided with a main conductive plate. The main conductive plate has an L-shaped structure, including vertical sides and right-angled corners. The lower end of the bimetallic strip is in contact with and fixedly connected to the vertical sides to sense the temperature of the main conductive plate. The right-angled corner is close to the lower portion of the instantaneous release plate 13. After the bimetallic strip passes through the side gap of the mounting bracket, its upper end is in movable contact with the draw rod through the thermal release screw. When the main conductive plate generates a short-circuit current, a strong magnetic field is generated at the right-angled corner, which attracts the lower portion of the instantaneous release plate 13, causing the instantaneous release plate 13 to flip, thereby causing its contact plate to touch the draw rod.

[0029] The working principle of the present invention is as follows: (1) Thermal release: The core component of the thermal release is a bimetallic strip, which is welded from two metal materials with different thermal expansion coefficients and is connected to the main conductive plate. When the main circuit is overloaded, the current increases and the bimetallic strip generates heat. Due to the different thermal expansion coefficients of the two metals, the bimetallic strip will bend toward the side with a smaller thermal expansion coefficient, and the degree of bending gradually increases as the overload time increases. When the bimetallic strip bends to a certain extent, its free end pushes the trigger plate in the trigger mechanism to move. The movement of the trigger plate drives the traction rod to rotate synchronously. A slot is provided in the middle of the traction rod, and the clip head of the clip is clipped to the outside of the slot. When the traction rod rotates, the relative position of the slot and the clip head of the clip changes, which eventually causes the clip head of the clip to enter the slot, triggering the circuit breaker to trip and achieve protection against overload faults.

[0030] (2) Magnetic release: The magnetic release consists of an instantaneous release plate and a tension spring. When a short circuit occurs in the main circuit, a huge current will be generated instantly, and a strong magnetic field will be generated around the right-angle corner of the main conductive plate. The strength of the magnetic field is proportional to the current. The larger the short-circuit current, the stronger the magnetic field. Under the action of a strong magnetic field, the lower part of the instantaneous release plate is subjected to electromagnetic attraction, overcoming the tension of the tension spring and flipping. The upper contact plate of the instantaneous release plate contacts the trigger mechanism, and the movement of the trigger plate drives the traction rod to rotate, thereby triggering the circuit breaker to trip quickly. Due to the extremely large magnetic field force generated by the short-circuit current, the magnetic release can achieve instantaneous tripping, quickly cut off the circuit, and avoid serious damage caused by the short circuit fault. A tension spring slot is provided on the mounting bracket. One end of the tension spring is connected to the instantaneous release plate, and the other end is connected to the end of the tension spring slot. Under normal conditions, the tension spring generates tension on the instantaneous release plate, keeping it in its initial position. The instantaneous release plate 13 needs to overcome the tension of the tension spring to flip over, which ensures that the magnetic release will not malfunction under normal current and will only be triggered when a large current is short-circuited.

[0031] (3) Electronic tripping: The electronic controller is connected to the main circuit through a current sensor. The current sensor converts the current signal in the main circuit into an electrical signal that the electronic controller can process, such as a voltage signal. The electronic controller has preset current thresholds and protection characteristic curves for various fault types, such as long delay for overload, short delay for short circuit, and instantaneous tripping thresholds. The electronic controller monitors and analyzes the input electrical signal in real time and compares the detected current value with the preset threshold. When the current exceeds the preset threshold and it is determined that the main circuit has a fault (such as overload, short circuit, ground fault, etc.), the electronic controller sends a trigger signal. After receiving the trigger signal from the electronic controller, the dedicated tripping device pushes the trigger plate in the trigger mechanism to move through the internal electromagnetic mechanism or motor and other actuators. The trigger plate drives the traction rod to move, causing the circuit breaker to trip. The electronic tripping device is an existing technology with advantages such as high precision, flexible setting of protection parameters, and adaptability to various fault types. It can be personalized according to actual needs.

[0032] The trigger mechanism is the common actuator for all three tripping modes. Its core consists of a trigger plate, a pull rod, and a slot. Whether triggered by a thermal release, a magnetic release, or an electronic release, tripping is ultimately achieved by pushing the trigger plate. The trigger plate and the pull rod are integrated, and the outer edge of the slot in the middle of the pull rod engages with the buckle. When any of the tripping modes is triggered, the trigger plate is forced to move, and the pull rod moves with it, causing the buckle to enter the slot. The locking relationship between the buckle and the front edge of the slot is broken, thereby triggering the circuit breaker's internal energy storage mechanism, achieving rapid tripping, severing the main circuit, and implementing fault protection.

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in the technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as the scope of protection of the present invention without paying creative labor.

Claims

1. A circuit breaker tripping device with multi-mode triggering, comprising a thermal tripper, a magnetic tripper, an electronic tripper, a mounting bracket, and a dedicated tripper. The electronic tripper is controlled by an electronic controller, which is connected to the main circuit via a current sensor. The current sensor converts the current signal in the main circuit into an electrical signal that can be processed by the electronic controller. The device is characterized by: The mounting bracket is provided with mounting holes and slots. The magnetic release and the electronic release are both installed on the mounting bracket. The thermal element is installed close to the main circuit. The thermal element contains a bimetallic strip. The upper end of the bimetallic strip is connected to the trigger mechanism of the special release. The electronic controller is provided with a protective shell and is connected to the current sensor through a wire. The free end of the bimetallic strip of the thermal element is in contact with the trigger mechanism directly or through a transmission component; the thermal element is connected to the conductive plate of the main circuit.

2. A circuit breaker tripping device with multi-mode triggering according to claim 1, characterized in that: The trigger mechanism is a traction rod, which includes a trigger plate, a rotating shaft, and a slot. The trigger plate and the rotating shaft 7 are integrated, and a slot is provided in the middle of the traction rod.

3. The circuit breaker tripping device with multi-mode triggering according to claim 1, characterized in that: The mounting bracket is provided with a tension spring groove, in which a tension spring is installed. The magnetic release includes an instantaneous release plate, a tension spring, and a main conductive plate. One end of the tension spring is connected to the instantaneous release plate, and the other end is connected to the end of the tension spring groove. The main conductive plate is fixed to the lower part of the mounting bracket. The instantaneous release plate is V-shaped as a whole. Rotating shafts are provided on both sides of the instantaneous release plate. The instantaneous release plate is hingedly connected to the mounting bracket through the rotating shaft, and the upper part of the instantaneous release plate is in contact with the trigger plate.

4. The circuit breaker tripping device with multi-mode triggering according to claim 1, characterized in that: The traction rod is further provided with a spring, which applies a force to the traction rod so that the rotating shaft rotates in one direction in a natural state, thereby realizing a reset action of the traction rod after being touched by the tripping device.

5. The circuit breaker tripping device with multi-mode triggering according to claim 1, characterized in that: The mounting bracket is provided with a tension spring groove, in which a tension spring is installed. The magnetic release includes an instantaneous release plate, a tension spring, and a current plate. One end of the tension spring is connected to the instantaneous release plate, and the other end is connected to the end of the tension spring groove. The current plate is fixed to the lower part of the mounting bracket. The side surface of the instantaneous release plate is in a < shape. Rotating shafts are provided on both sides of the middle part of the instantaneous release plate. The instantaneous release plate is hingedly connected to the mounting bracket through the rotating shaft, and the upper part of the instantaneous release plate is in contact with the trigger plate.

6. The circuit breaker tripping device with multi-mode triggering according to claim 1, characterized in that: The upper end of the instantaneous release plate includes a contact plate and a connecting hole. The contact plate is bent toward the front, and its end is in active contact with the trigger plate of the traction rod. The connecting hole is connected to one end of the tension spring.

7. The circuit breaker tripping device with multi-mode triggering according to claim 5, characterized in that: A connecting head is also provided in the tension spring groove, and the connecting head can slide back and forth in the tension spring groove. The front end of the connecting head is connected to the other end of the tension spring, and the rear end of the connecting head is provided with a threaded hole. The tension spring groove is provided with a limiting hole, and the screw passes through the limiting hole and is threadedly connected to the connecting head. By rotating the screw, the position of the connecting head in the tension spring groove can be adjusted.

8. The circuit breaker tripping device with multi-mode triggering according to claim 1, characterized in that: The mounting bracket is also provided with a slot II. The two ends of the instantaneous release plate will contact the front and rear edges of the slot II. The slot II is used to limit the swing amplitude of the instantaneous release plate. In the natural state, under the action of the tension spring, the back sides of the two ends of the instantaneous release plate contact the rear edge of the slot II. When the main circuit is short-circuited, the instantaneous release plate swings and the front sides of the two ends contact the front edge of the slot II and is limited.

9. A circuit breaker with multi-mode triggering, characterized in that: It includes a base and the above-mentioned tripping device. The base is provided with a main conductive plate. The main conductive plate is an L-shaped structure, which includes vertical sides and right-angled corners. The lower end of the bimetallic strip is in contact with and fixedly connected to the vertical side to sense the temperature of the main conductive plate. The right-angled corner is close to the lower part of the instantaneous release plate. When the main conductive plate generates a short-circuit current, a strong magnetic field is generated, thereby attracting the lower part of the instantaneous release plate, causing the instantaneous release plate to flip, and its contact plate thereby touching the traction rod.

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