CN215869243U

CN215869243U - Shunt release and circuit breaker

Info

Publication number: CN215869243U
Application number: CN202121903451.8U
Authority: CN
Inventors: 陆庆华; 郭德鑫; 陈士军; 江华华
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2021-08-13
Filing date: 2021-08-13
Publication date: 2022-02-18
Anticipated expiration: 2031-08-13

Abstract

The utility model provides a shunt release and circuit breaker, the circuit breaker is provided with the shunt release, the shunt release includes shunt coil assembly, shunt coil assembly includes shunt coil and by shunt coil driven moving part, is provided with thermistor with the shunt coil laminating, thermistor and shunt coil series connection are in giving the auxiliary circuit of shunt coil power supply. According to the utility model, the shunt coil assembly and the thermistor are arranged in a fitting manner, and the shunt coil assembly is matched with the thermistor, so that the normal breaking of the circuit breaker can be realized, and the shunt coil assembly can be protected under an abnormal condition.

Description

Shunt release and circuit breaker

Technical Field

The utility model relates to a low-voltage electrical appliance, in particular to a shunt release and a circuit breaker.

Background

A circuit breaker is a common switching element used in an electric power system to turn on and off an electric circuit and automatically break the electric circuit when an overcurrent or leakage fault occurs in the electric circuit. The circuit breaker is usually provided with a shunt release, whether the shunt release can normally operate is an important index for judging whether the circuit breaker is reliable, at present, the shunt release is usually formed by connecting a shunt coil and a microswitch in series, the mechanical combination mode has the defects of low sensitivity and narrow working temperature range, and the shunt release can fail due to mechanical faults such as clamping stagnation and the like in the using process, even the shunt coil is burnt.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a shunt release with high reliability.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the shunt release comprises a shunt coil assembly, wherein the shunt coil assembly comprises a shunt coil and a moving part driven by the shunt coil, a thermistor is attached to the shunt coil, and the thermistor and the shunt coil are connected in series in an auxiliary loop for supplying power to the shunt coil.

Further, when the auxiliary loop is powered on, the thermistor is powered on to generate heat, and when the temperature is higher than the sudden change temperature, the current in the auxiliary loop is instantly increased to the current capable of driving the shunt coil assembly to act, and the shunt coil drives the movable piece to act.

Further, when the auxiliary loop is powered on, the thermistor is powered on to generate heat, when the temperature is higher than the sudden change temperature, the current in the auxiliary loop is instantly increased to the current capable of driving the shunt coil assembly to act, the auxiliary loop is continuously powered on due to abnormal reasons, so that the shunt coil is continuously powered on and heated, and when the temperature reaches the protection temperature of the thermistor, the resistance value of the thermistor tends to be infinite so as to protect the shunt coil from being burnt.

And the movable part of the shunt coil assembly can stretch out of the mounting groove, and the thermistor is attached to the shunt coil of the shunt coil assembly in the mounting groove.

Furthermore, the thermistor is positioned at the lower part of the shunt coil or at one side of the shunt coil, which is far away from the moving part, and the lead wires of the shunt coil assembly and the thermistor penetrate out of the threading hole formed in the side wall of the mounting groove.

Furthermore, one end of the shell is provided with a connecting shaft, a pushing piece is connected to the connecting shaft in a rotating mode, and the pushing piece is driven by a moving piece of the shunt coil assembly to swing close to or far away from the mounting groove.

Furthermore, the pushing piece comprises a push rod and an elastic piece matched with the push rod, after the shunt coil is powered on, the moving piece drives the pushing piece to swing in the direction away from the mounting groove, the elastic piece stores energy, after the shunt coil is powered off, the moving piece retracts into the mounting groove, and the elastic piece releases energy to enable the push rod to swing in the direction close to the mounting groove.

Furthermore, the pushing piece further comprises a pushing plate arranged at one end of the mounting groove, the two ends of the pushing plate are in sliding fit with the shell, a connecting hole is formed in the middle of the pushing plate, and the moving part is matched with the connecting hole and drives the pushing plate to move close to or far away from the mounting groove along the shell.

A circuit breaker is provided with the shunt release.

Preferably, the control device comprises a control module, an operating mechanism and a traction rod matched with the operating mechanism, wherein the control module is electrically connected with the shunt release and used for controlling the shunt release to be powered, the traction rod is driven to trigger the circuit breaker to release the shunt brake when the shunt release acts, and the control module can receive an external control signal to control whether the shunt release is powered or not.

According to the shunt release and the circuit breaker, the shunt coil assembly and the thermistor are arranged in a fitting manner, so that after the auxiliary circuit is electrified, the shunt coil assembly is matched with the thermistor, normal breaking of the circuit breaker can be realized, and when the shunt release cannot drive the circuit breaker to be opened, the shunt coil can be protected by using the characteristic of the thermistor, and the shunt release is prevented from being damaged.

In addition, the on-off of the auxiliary loop is controlled, and the circuit breaker can be remotely controlled through the shunt release.

Drawings

Fig. 1 is a circuit diagram of a circuit breaker and shunt release of the present invention;

fig. 2 is a schematic structural diagram of the shunt release of the present invention;

fig. 3 is a schematic structural diagram of the shunt release of the present invention (without the pushing member and the elastic member).

Detailed Description

The following describes a shunt release and a circuit breaker according to embodiments of the present invention with reference to fig. 1 to 3. A shunt release and a circuit breaker of the present invention are not limited to the description of the following embodiments.

As shown in fig. 1-2, a shunt release includes a shunt coil assembly, the shunt coil assembly includes a shunt coil BL and a moving member 16 driven by the shunt coil BL, a thermistor BR is attached to the shunt coil BL, and the thermistor BR and the shunt coil BL are connected in series in an auxiliary loop for supplying power to the shunt coil BL.

The shunt release is generally used for being installed in the circuit breaker and used for driving the circuit breaker to open a brake, the circuit breaker comprises a control module C, an operating mechanism and a draw bar matched with the operating mechanism, the control module C is electrically connected with the shunt release B and used for controlling the shunt release B to supply power, and the draw bar is driven to trigger the circuit breaker A to open the brake when the shunt release B acts. When the circuit breaker is required to be controlled to be switched off, the control module C controls an auxiliary loop of the shunt release to be switched on, when the auxiliary loop is switched on to enable the thermistor BR and the shunt coil assembly to be electrified, when the shunt coil assembly acts to drive the circuit breaker A to be switched off, normal breaking of the circuit breaker A is achieved, and when the shunt coil assembly acts to drive the circuit breaker A to be switched off, the thermistor BR reaches protection temperature to enable the shunt coil assembly not to be burnt. Of course, the shunt release can be used for not only the circuit breaker, but also other switching appliances.

According to the circuit breaker A and the shunt release B, the shunt coil BL and the thermistor BR are arranged in a laminating manner, so that after an auxiliary circuit is electrified, the shunt coil assembly is matched with the thermistor BR, normal breaking of the circuit breaker A can be realized, and the characteristic of the thermistor BR can be used for protecting the shunt coil BL to avoid damaging the shunt release B when the shunt release B cannot drive the shunt of the circuit breaker A.

An embodiment of a shunt release and a circuit breaker B is provided with reference to fig. 1-3, where the circuit breaker a (not shown) includes a housing, a handle mechanism, an operating mechanism, and a contact mechanism are disposed in the housing, the contact mechanism includes a moving contact and a stationary contact that are matched with each other, the moving contact, the handle mechanism, and the operating mechanism are sequentially linked, and the switching on/off of the circuit breaker a can be manually operated by the handle mechanism. In this embodiment, the circuit breaker a may be a single-pole circuit breaker a or a multi-pole circuit breaker a, and when the circuit breaker a is the multi-pole circuit breaker a, the plurality of circuit breakers a are linked.

Still be provided with control module C in the circuit breaker A and by control module C driven shunt release B, control module C is connected with shunt release B electricity and is used for controlling the power supply for shunt release B, shunt release B passes through the traction lever of circuit breaker and circuit breaker A's operating device cooperation, and after shunt release B was triggered, shunt release B acted, and the electromagnetic force that provides through the shunt coil subassembly drives the traction lever and makes operating device dropout to realize circuit breaker A's separating brake, thereby provide the protection for circuit breaker A.

In this embodiment, the control module C is preferably integrated on a circuit board, and the control module C controls the power on and power off of the auxiliary loop by receiving an external control signal, so as to realize remote control of the opening of the circuit breaker a. A controller and a microswitch (marked as K in figure 1) for analyzing and processing signals are arranged on the circuit board, the controller can receive control signals transmitted from the outside, and output action signals to a driving piece arranged in the circuit breaker according to the control signals, and the driving piece acts to trigger the microswitch to be switched on or switched off, so that the control module C is connected or disconnected with a power supply, and the shunt release B acts; in addition, the microswitch can also be arranged outside the circuit breaker, the on-off of the auxiliary loop can be remotely controlled by manually triggering the on-off of the microswitch, and the release B can be remotely operated, so that the remote control of the opening of the circuit breaker can be realized. Of course, the micro switch may be replaced by an electronic switch such as a MOS transistor.

As shown in fig. 1, the shunt release B includes a shunt coil assembly driven by a control module C, the shunt coil assembly is attached to at least one thermistor BR, the thermistor BR is connected in series with the shunt coil assembly to an auxiliary circuit, the auxiliary circuit is powered on when the control module C is powered on, at this time, current flows through the thermistor BR and the shunt coil assembly, when the shunt coil assembly operates to drive the breaker a to be switched off, normal breaking of the breaker a is realized, and when the shunt coil assembly operates to disable the breaker a to be switched off, the shunt coil assembly is not burned out by using the characteristic of the thermistor BR when the thermistor BR reaches a protection temperature.

The specific process is that the microswitch in fig. 1 is closed, the control module C is connected with a power supply to electrify the auxiliary loop, the thermistor BR is electrified to generate heat, and when the temperature is higher than the abrupt change temperature, the current in the auxiliary loop is instantly increased to the current capable of driving the shunt coil assembly to act, the shunt coil BL drives the moving part 16 to act, and the shunt release acts to drive the traction rod to release the operating mechanism, so that the normal breaking of the circuit breaker a is realized; after the breaker A is switched off, the auxiliary circuit is powered off, and the shunt coil assembly and the thermistor BR are powered off because the power supply comes from the main circuit controlled by the breaker A.

When the current in the auxiliary loop is increased to the current capable of driving the shunt coil assembly to act, due to abnormal reasons, such as faults generated by clamping stagnation of a traction rod matched with the shunt release B or other mechanical faults, when the shunt coil assembly cannot drive the breaker A to open the breaker timely, the auxiliary loop is continuously electrified to continuously electrify the shunt coil assembly, the temperature of the shunt coil BL is continuously increased under the continuously existing voltage, and the attached thermistor BR is heated.

As shown in fig. 2 and 3, the shunt release B includes a housing 1, a mounting groove 11 is formed in the housing 1, and a shunt coil assembly and a thermistor BR are jointly assembled in the mounting groove 11, wherein the shunt coil assembly includes a shunt coil BL and a moving member 16 driven by the shunt coil BL, two ends of the shunt coil BL are respectively electrically connected to the thermistor BR and a control module C, the moving member 16 is connected in the middle of the shunt coil BL in a penetrating manner, and an electromagnetic force generated after the shunt coil assembly is powered can drive one end of the moving member 16 to extend out of the mounting groove 11; the thermistor BR is attached to the shunt coil BL, the thermistor BR can be attached to the lower part of the shunt coil BL or attached to one end, away from the movable part 16, of the shunt coil BL, a threading hole is formed in the side wall of the mounting groove 11, and a lead of the thermistor BR and the shunt coil BL penetrates through the threading hole and is used for connecting the control module C; a connecting shaft 12 is arranged at one end of the shell 1, the connecting shaft 12 is located on the upper side of a moving part 16, a pushing part is rotatably connected to the connecting shaft 12 and comprises a push rod 13 and an elastic part 14 matched with the push rod 13, in fig. 2, a protruding structure arranged at one end of the push rod 13 is used for being matched with a traction rod of a circuit breaker A, after a shunt coil BL is electrified, one end of the shunt coil BL drives the moving part 16 to extend out of the mounting groove 11, the moving part 16 drives the pushing part to swing in a direction far away from the mounting groove 11, at the moment, the elastic part 14 stores energy, after the shunt coil BL is electrified, the moving part 16 retracts into the mounting groove 11, and the elastic part 14 releases energy to enable the push rod 13 to swing in a direction close to the mounting groove 11.

Further, still be equipped with push pedal 15 in one side of mounting groove 11, push pedal 15's both ends and 1 sliding fit of casing, preferably, are equipped with groove structure respectively in the 1 both sides of casing of mounting groove 11 one end, push pedal 15's both ends respectively with groove structure sliding fit the middle part of push pedal 15 is provided with connecting hole 151, connecting hole 151 is passed to the one end of moving part 16, drives push pedal 15 when moving part 16 is driven and moves to the direction that is close to or keeps away from mounting groove 11, and the both ends of push pedal 15 and groove structure's cooperation can play the guide effect this moment. Of course, the same applies to the push rod 13 directly pushed by the movable member 16 without providing the push plate 15.

The foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.

Claims

1. A shunt release, includes shunt coil assembly, shunt coil assembly includes shunt coil (BL) and by shunt coil (BL) driven moving part (16), its characterized in that: the thermistor (BR) is attached to the shunt coil (BL) and connected in series with the shunt coil (BL) in an auxiliary loop for supplying power to the shunt coil (BL).

2. The shunt release of claim 1, wherein: when the auxiliary loop is electrified, the thermistor (BR) is electrified to generate heat, and when the temperature is higher than the abrupt change temperature, the current in the auxiliary loop is instantly increased to the current capable of driving the shunt coil assembly to act, and the shunt coil (BL) drives the moving part (16) to act.

3. The shunt release of claim 1, wherein: when the auxiliary loop is electrified, the thermistor (BR) is electrified to generate heat, when the temperature is higher than the abrupt change temperature, the current in the auxiliary loop is instantly increased to the current capable of driving the shunt coil assembly to act, the auxiliary loop is continuously electrified due to abnormal reasons to cause the shunt coil (BL) to be continuously electrified and heated, and when the temperature reaches the protection temperature of the thermistor (BR), the resistance value of the thermistor (BR) tends to be infinite so as to protect the shunt coil (BL) from being burnt.

4. The shunt release of claim 1, wherein: still include casing (1) is equipped with mounting groove (11) that are used for assembling shunt coil subassembly and thermistor (BR), outside mounting groove (11) can be stretched out in shunt coil subassembly's moving part (16), thermistor (BR) and shunt coil subassembly's shunt coil (BL) laminating setting in mounting groove (11).

5. The shunt release of claim 4, wherein: the thermistor (BR) is positioned at the lower part of the shunt coil (BL) or at one side of the shunt coil (BL) far away from the moving part (16), and the lead wires of the shunt coil assembly and the thermistor (BR) penetrate out of the threading hole formed in the side wall of the mounting groove (11).

6. The shunt release of claim 4, wherein: one end of the shell (1) is provided with a connecting shaft (12), a pushing piece is rotatably connected to the connecting shaft (12), and the pushing piece is driven by a moving piece (16) of the shunt coil assembly to swing close to or far away from the mounting groove (11).

7. The shunt release of claim 6, wherein: the pushing piece comprises a pushing rod (13) and an elastic piece (14) matched with the pushing rod (13), after the shunt coil (BL) is electrified, the pushing piece is driven by the moving piece (16) to swing towards the direction far away from the mounting groove (11), the elastic piece (14) stores energy, after the shunt coil (BL) is electrified, the moving piece (16) retracts into the mounting groove (11), and the elastic piece (14) releases energy to enable the pushing rod (13) to swing towards the direction close to the mounting groove (11).

8. The shunt release of claim 7, wherein: the pushing piece further comprises a pushing plate (15) arranged at one end of the mounting groove (11), the two ends of the pushing plate (15) are in sliding fit with the shell (1), a connecting hole (151) is formed in the middle of the pushing plate (15), and the moving piece (16) is matched with the connecting hole (151) and drives the pushing plate (15) to move close to or far away from the mounting groove (11) along the shell (1).

9. A circuit breaker, characterized by: the shunt release (B) according to any one of claims 1 to 8 is fitted on the circuit breaker (a).

10. The circuit breaker of claim 9, wherein: the control module (C) is electrically connected with the shunt release (B) and used for controlling the shunt release (B) to be powered, the shunt release (B) is driven to trigger the circuit breaker (A) to trip and separate the brake when acting, and the control module (C) can receive an external control signal to control whether the shunt release (B) is powered or not.