An electric operating mechanism for plug-in circuit breakers

Abstract

The application relates to an electric operating mechanism of an insertion type circuit breaker, which comprises a closing motor, a tripping electromagnet, a PCB control panel and a micro-motion detection switch. When the circuit breaker needs to be closed, the PCB control panel gives a closing signal to make the closing motor rotate, a driving wheel is driven to rotate by a driven wheel, an electric handle is driven to close the circuit breaker, and the closing detection switch is closed to detect whether the circuit breaker is closed to the position. When the circuit breaker needs to be tripped, the PCB control panel gives a tripping signal to make the tripping electromagnet electrified, a moving core of the tripping electromagnet pushes a trip lever of the circuit breaker to make the circuit breaker trip, and the tripping detection switch is actuated to detect whether the circuit breaker is tripped to the position. The electric operating mechanism is simple in structure, compact in installation, can be conveniently installed into the shell of the circuit breaker, can realize automatic control of the circuit breaker through a golden finger slot, the closing and tripping of the circuit breaker are independent systems, and the use of the detection switch makes the electric closing and tripping of the circuit breaker stable and reliable.

Description

Technical Field

[0001] This invention relates to a low-voltage electrical appliance, specifically to an electric operating mechanism for a plug-in circuit breaker. Background Technology

[0002] With the rapid development of my country's power and communication technologies, especially the application of 5G network technology, increasingly higher requirements have been placed on the practicality, safety, and reliability of terminal electrical equipment such as circuit breakers. Traditional circuit breakers can no longer meet these requirements. Through continuous research and development, my country's circuit breakers have not only reached new levels in terms of miniaturization, intelligence, and reliability, but also introduced many new structural designs. For example, they can be easily plugged in and used like ordinary electrical plugs, can be conveniently installed into or removed from the circuit, and can be locked in a stable working state in the installation position. At the same time, the wiring direction of this type of circuit breaker and the wiring direction of the external conductors are in the same plane. This is the plug-in circuit breaker.

[0003] Currently, the opening and closing operation mechanism of plug-in circuit breakers is generally manually operated. Plug-in circuit breakers with electric operating mechanisms are often complex in structure and large in size. In some cases, accessories have to be added next to the circuit breaker, which increases the difficulty of using plug-in circuit breakers. Summary of the Invention

[0004] This invention discloses an electric operating mechanism for a small-sized and stable plug-in circuit breaker.

[0005] The technical solution adopted in this invention is:

[0006] An electric operating mechanism for a plug-in circuit breaker includes a plug-in circuit breaker, a housing, an incoming line mechanism, an outgoing line mechanism, a manual operating mechanism, an electric operating mechanism, a contact actuation mechanism, and an overload and short-circuit protection mechanism.

[0007] Further configuration: the housing of the plug-in circuit breaker is a rectangular hexahedron with the outgoing terminal on the front and the incoming terminal on the rear. The left side is the base and the right side is the top cover. The base is configured as one pole and the top cover is configured as the other pole. A side cover is provided on the right side of the housing.

[0008] Further, the manual operating mechanism includes an operating handle, a circuit breaker opening / closing display mechanism, and a locking mechanism. The operating handle is located on the upper front side of one pole of the left base of the housing. The circuit breaker opening / closing display mechanism is located on one side of the operating handle and on the upper front side of the other pole of the housing cover. The locking mechanism is located on the upper part of the operating handle.

[0009] Further configuration: the electric operating mechanism includes a closing mechanism, a opening mechanism, a PCB control board, and a micro switch. The closing mechanism includes a closing motor and a drive wheel mounted on the output shaft of the closing motor, as well as a driven wheel meshing with the drive wheel. The drive wheel is vertically mounted on the PCB control board via a mounting shaft on one side of the drive wheel, and the driven wheel is vertically mounted on the PCB control board via a mounting shaft on one side of the driven wheel. The opening mechanism includes an opening electromagnet horizontally mounted at the bottom of the PCB control board.

[0010] In a further configuration, the contact actuation mechanism is located on the rear side of the electric operating mechanism, and an arc guide plate is provided between the moving and stationary contacts of the electric operating mechanism. An arc extinguishing chamber is provided on the rear side of the arc guide plate.

[0011] Further, the overload and short circuit protection mechanism includes a thermal trip bimetallic strip and an electromagnetic trip unit. One end of the thermal trip bimetallic strip is connected to the contact actuation mechanism via a connecting rod, and the other end of the thermal trip bimetallic strip is connected to the inlet port of one pole. The electromagnetic trip unit is located at the lower part of the contact actuation mechanism, and the contact actuation mechanism is driven by the armature action of the electromagnetic trip unit.

[0012] Further, a current transformer is provided on the rear side of the arc-extinguishing chamber, and an inlet port for the other pole is provided on the rear side of the current transformer.

[0013] Further, the incoming line mechanism includes an incoming line socket and a gold finger slot. The incoming line socket is located on the rear side of the plug-in circuit breaker, with one pole incoming line socket located on top and the other pole incoming line socket located on the bottom. Between the two pole incoming line sockets, a gold finger slot is provided for data acquisition and communication with the plug-in circuit breaker.

[0014] The outgoing line mechanism includes a fastening screw and a wiring cavity. The fastening screw and the wiring cavity are located on the front side of the plug-in circuit breaker. The fastening screw is located on the upper part of the wiring cavity. The wiring screws and wiring cavities of the two poles are arranged side by side, and an arc-blocking plate is provided between the two poles.

[0015] Further, the closing mechanism includes a closing motor, a driving wheel, a driven wheel, and a micro switch.

[0016] Further configuration: the micro switch includes a closed position switch, an open position switch, and a power-off switch, which are mounted on the PCB control board. The micro switch operates in conjunction with the driving wheel and the driven wheel via a lever on one side.

[0017] Further configuration: the driving wheel is an incomplete gear with several meshing teeth on its upper part; the driven wheel is connected to the output shaft of the closing motor reducer; the driving wheel has an open groove on its side and transition slopes on both sides of the open groove.

[0018] Further configuration: the driven wheel is an incomplete gear with several meshing teeth on its upper part; an exhaust hole is provided on one side of the center of the driven wheel, and a triangular shaft is provided on the other side of the center; the exhaust hole is provided to ensure the triangular shaft is properly installed; an electric handle is fitted around the triangular shaft; an opening groove is provided on the side of the driven wheel, and transition slopes are provided on both sides of the opening groove.

[0019] Further, the electric handle is cylindrical, with a vent at one end to ensure proper installation, and a triangular shaft hole at the other end to connect the electric handle to the driven wheel. The side of the electric handle has a tripping limit block and a closing limit block. The tripping limit block has a tripping linkage hole, through which a tripping linkage is installed and connected to the operating handle of the plug-in circuit breaker. The closing limit block has a closing linkage hole, through which a closing linkage is installed and connected to the contact actuation mechanism of the plug-in circuit breaker.

[0020] Further configuration includes a closing mechanism comprising a closing motor and a driving wheel mounted on the output shaft of the closing motor, as well as a driven wheel meshing with the driving wheel. A reduction gearbox is located on one side of the closing motor, and the output shaft of the reduction gearbox is connected to the driving wheel. The incomplete teeth of the driving wheel mesh with the incomplete teeth of the driven wheel. A triangular shaft is located on one side of the center of the driven wheel, and an electric handle is fitted around the triangular shaft. When the circuit breaker needs to be closed, the PCB control board sends a closing signal, causing the closing motor to rotate clockwise, and the driving wheel to rotate as well. The meshing teeth of the driving wheel drive the meshing teeth of the driven wheel to rotate counterclockwise, driving the electric handle to rotate counterclockwise. An electric handle is located on one side of the electric handle. The closing linkage of the handle actuates, pushing the contact actuation mechanism to close the circuit breaker. After the plug-in circuit breaker closes, the meshing teeth of the driving wheel and the driven wheel disengage, and the driving wheel and the driven wheel separate. At this time, the groove slope on one side of the driven wheel presses against the closing position switch and closes it to detect whether the plug-in circuit breaker is closed. After the driving wheel continues to rotate at an angle, the de-energized position switch is pressed against the groove slope on the driving wheel and disconnected, causing the closing motor to stop rotating. After the driving wheel stops rotating, the meshing teeth of the driving wheel and the driven wheel disengage. At this time, the plug-in circuit breaker can be manually opened and closed. The open position switch and the close position switch on the side of the driven wheel can detect whether the plug-in circuit breaker is in the open or closed state.

[0021] Further, the tripping mechanism includes a tripping electromagnet and a tripping release lever. When the plug-in circuit breaker needs to be tripped, the PCB control board sends a tripping signal to energize the tripping electromagnet. The moving iron core of the tripping electromagnet pushes the tripping release lever, causing the plug-in circuit breaker to trip. At this time, the closing position switch is released, and the electric handle is reset by the action of the toggle spring, thus activating the opening position switch. Driven wheel The groove is pressed and closed by the inclined surface to detect whether the circuit breaker has been fully opened.

[0022] Furthermore, the PCB control board also includes a flexible PCB board, which connects the PCB control board and the gold finger slot to realize data acquisition and communication connection of the plug-in circuit breaker.

[0023] In a further configuration, the plug-in circuit breaker includes the electrically operated mechanism of any of the plug-in circuit breakers described above.

[0024] The advantages of the above-described plug-in circuit breaker structure are:

[0025] The electric operating mechanism of this plug-in circuit breaker has a simple structure and compact installation, allowing for easy insertion into the circuit breaker's housing. Since the plug-in circuit breaker uses a closing motor for closing and a opening electromagnet for opening, these two systems are independent and do not interfere with each other. Furthermore, the closing motor rotates in only one direction during closing, effectively extending the service life of the closing system and reducing maintenance workload. The use of microswitches on the sides of the drive and driven wheels via grooves and bevels ensures that the circuit breaker can only proceed to the next step after successful opening / closing detection. The inclusion of a PCB control board and a flexible PCB allows for automatic control of the plug-in circuit breaker via gold finger slots. These measures enable the plug-in circuit breaker to have communication capabilities, meeting various intelligent usage requirements while maintaining stable and reliable operation. Attached Figure Description

[0026] Figure 1 This is a diagram showing the overall appearance and structure of a plug-in circuit breaker.

[0027] Figure 2 This is a schematic diagram of the internal structure of a plug-in circuit breaker.

[0028] Figure 3 This is a front view of a plug-in circuit breaker without the side cover.

[0029] Figure 4 for Figure 2 Structural diagram of the electric operating mechanism.

[0030] Figure 5 for Figure 4 Active wheel structure diagram.

[0031] Figure 6 for Figure 4 Structural diagram of the driven wheel side.

[0032] Figure 7 for Figure 4 Structural diagram of the other side of the driven wheel.

[0033] Figure 8 for Figure 4 Diagram of the motor drive structure for closing the circuit breaker.

[0034] Figure 9 for Figure 4 Structural diagram of one side of the electric handle.

[0035] Figure 10 for Figure 4 Structural diagram of the other side of the electric handle. Detailed Implementation

[0036] It should be noted that the terms "upper part", "middle part", "lower part", "end", "front", "rear", "side" and other terms indicating positional relationships used in this specification are based on the positional relationships shown in the accompanying drawings, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] The present invention will be further described with reference to the accompanying drawings and specific embodiments.

[0038] A plug-in circuit breaker, such as Figures 1-3 As shown, it includes a housing 1, an inlet mechanism 8, an outlet mechanism 3, a manual operating mechanism 2, an electric operating mechanism 4, a contact actuation mechanism 5, and an overload and short circuit protection mechanism 6.

[0039] Further configuration: the housing 1 is a rectangular hexahedron with a base 101 on the left and a top cover 102 on the right. The base 101 is set as one pole, and the top cover 102 is set as the other pole. A side cover 103 is provided on the right side of the housing.

[0040] Further, the manual operation mechanism 2 includes an operation handle 201, a circuit breaker opening / closing display mechanism 202, and a locking mechanism 203. The operation handle 201 is located on the upper front side of one pole 101 on the left side of the housing base, the circuit breaker opening / closing display mechanism 202 is located on the upper front side of the other pole 102 on the housing cover, and the locking mechanism 203 is located on the upper part of the operation handle 201.

[0041] Further, the electric operating mechanism 4 includes a closing mechanism, a opening mechanism, a PCB control board, and a micro switch. The closing mechanism includes a closing motor 401 and a drive wheel 405 mounted on the output shaft of the closing motor 401. It also includes a driven wheel 404 meshing with the drive wheel 405. The drive wheel 405 is vertically mounted on the PCB control board 407 via a mounting shaft 4051 on one side of the drive wheel. The driven wheel 404 is vertically mounted on the PCB control board 407 via a mounting shaft 4041 on one side of the driven wheel. The opening mechanism includes an opening electromagnet 402 horizontally mounted at the lower part of the PCB control board 407.

[0042] In a further configuration, the contact actuation mechanism 5 is located on the rear side of the electric operating mechanism 4, and an arc guide plate 601 is provided between the moving and stationary contacts of the electric operating mechanism. An arc extinguishing chamber 602 is provided on the rear side of the arc guide plate 601.

[0043] Further, the overload and short circuit protection mechanism includes a thermal trip bimetallic strip 603 and an electromagnetic trip unit 604. One end of the thermal trip bimetallic strip 603 is connected to the contact actuation mechanism 5 via a connecting rod 503, and the other end of the thermal trip bimetallic strip 603 is connected to the inlet socket 802 of one pole. The electromagnetic trip unit 604 is located at the lower part of the contact actuation mechanism 5, and the contact actuation mechanism 5 is driven by the armature action of the electromagnetic trip unit 604.

[0044] Further, a current transformer 7 is provided on the rear side of the arc-extinguishing chamber 602, and an inlet socket 801 for the other pole is provided on the rear side of the current transformer 7.

[0045] As a further feature, a gold finger slot 803 for data acquisition and communication with the plug-in circuit breaker is provided between the inlet ports 801 and 802 on the rear two poles of the plug-in circuit breaker.

[0046] Further, the outgoing line mechanism includes a fastening screw 302 and a wiring cavity 301. The fastening screw 302 and the wiring cavity 301 are located on the front side of the plug-in circuit breaker. The fastening screw 302 is located on the upper part of the wiring cavity 301. The fastening screws 302 and the wiring cavity 301 of the two poles are arranged side by side, and an arc-blocking plate 104 is provided between the two poles.

[0047] Further settings, such as Figure 8 As shown, the closing mechanism includes a closing motor 401, a driving wheel 405, a driven wheel 404, and a micro switch.

[0048] Further configuration: the micro switch includes a closed position switch 4062, an open position switch 4063, and a power-off switch 4061. The micro switch is mounted on the PCB control board 407. A lever is provided on one side of the micro switch. The micro switch works in conjunction with the drive wheel 405 and the driven wheel 404 via the lever.

[0049] Further settings, such as Figure 5 As shown, the drive wheel 405 is an incomplete gear with several meshing teeth 4053 on its upper part. The drive wheel 404 is connected to the output shaft of the reduction gearbox of the closing motor 401. The side of the drive wheel 405 is provided with an open groove 4054, and the two sides of the open groove are provided with transition slopes 4052.

[0050] Further settings, such as Figure 6 , Figure 7 As shown, the driven wheel 404 is an incomplete gear with several meshing teeth 4043 on its upper part. A mounting shaft 4041 is provided on one side of the center of the driven wheel 404, and a vent hole 4045 is provided at the center of the mounting shaft 4041. A triangular hole 4044 is provided on the other side of the center of the driven wheel 404, and a triangular shaft 4055 is provided in the triangular hole. The vent hole 4045 is provided to ensure that the triangular shaft 4055 is installed in place. An electric handle 403 is sleeved on the triangular shaft 4055. An opening groove 4044 is provided on the side of the driven wheel 404, and transition slopes 4042 are provided on both sides of the opening groove.

[0051] Further settings, such as Figure 9 , Figure 10 As shown, the electric handle 403 is cylindrical, with an exhaust hole 4033 at one end to allow the electric handle 403 to be installed properly, and a triangular shaft hole 4035 at the other end. The electric handle 403 is connected to the driven wheel 404 via the triangular shaft 4055. The side of the electric handle 403 is provided with a tripping limit block 4031 and a closing limit block 4034. A tripping linkage hole 4032 is provided in the tripping limit block 4031, and a tripping linkage is provided in the tripping linkage hole to connect with the operating handle of the plug-in circuit breaker. A closing linkage hole 4036 is provided in the closing limit block 4034, and a closing linkage is provided in the closing linkage hole to connect with the contact actuation mechanism of the plug-in circuit breaker.

[0052] Further settings, such as Figure 8As shown, a reduction gearbox 4011 is provided on one side of the closing motor 401. The output shaft of the reduction gearbox 4011 is connected to the driving wheel 405. The incomplete teeth 4053 of the driving wheel 405 mesh with the incomplete teeth 4043 of the driven wheel. A triangular shaft 4055 is provided on one side of the center of the driven wheel 404. An electric handle 403 is sleeved on the triangular shaft 4055. When it is necessary to close the plug-in circuit breaker, the PCB control board 407 gives a closing signal, causing the closing motor 401 to rotate clockwise. The driving wheel 405 also rotates, driving the driven wheel 405 to rotate counterclockwise. The driven wheel 405 passes through... The triangular shaft 4055 drives the electric handle 403 to rotate counterclockwise to close the plug-in circuit breaker. After the plug-in circuit breaker is closed, the driving wheel 405 and the driven wheel 404 separate. The driven wheel 404 continues to rotate, and the grooved inclined surface 4052 on one side presses against the lever of the closing position switch 4062, causing the closing position switch 4062 to close, in order to detect whether the plug-in circuit breaker is closed. After the driving wheel 4005 continues to rotate at an angle, the lever of the power-off position switch 4061 is pressed against the grooved inclined surface 4052 on the driving wheel 405, causing the power-off position switch 4061 to open, thus de-energizing the closing motor 401 and stopping its rotation.

[0053] Further, the tripping mechanism includes a tripping electromagnet 402 and a tripping release lever 504. When the plug-in circuit breaker needs to be tripped, the PCB control board 407 provides a tripping signal, energizing the tripping electromagnet 402. The moving iron core of the tripping electromagnet 402 pushes the tripping release lever 504, causing the plug-in circuit breaker to trip. At this time, the closing position switch 4062 is released, and the electric handle 403 is reset under the action of the reset spring. The lever of the tripping position switch 4063 is pressed and closed by the inclined surface 4042 of the groove of the driven wheel 404 to detect whether the circuit breaker is tripped.

[0054] In a further configuration, the PCB control board 407 also includes a PCB flexible board 4071, which connects the PCB control board 407 and the gold finger slot 803 to realize data acquisition and communication connection of the plug-in circuit breaker.

[0055] It should be noted that the above embodiments are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation. For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all implementation methods here, and obvious variations or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. An electrically operated mechanism for a plug-in circuit breaker, comprising a plug-in circuit breaker, an incoming line mechanism, an outgoing line mechanism, a manual operating mechanism, an electrically operated mechanism, a contact actuation mechanism, and an overload and short-circuit protection mechanism; characterized in that: The housing of the plug-in circuit breaker is a rectangular hexahedron with an outgoing terminal on the front and an incoming terminal on the rear. The left side is the base, and the right side is the top cover. The base is one pole, and the top cover is the other pole. A side cover is provided on the right side of the housing. The manual operating mechanism includes an operating handle, a locking mechanism on the upper part of the operating handle, and a closing / opening display mechanism on the side of the operating handle. The electric operating mechanism includes a closing mechanism, a opening mechanism, a PCB control board, and a micro switch. The closing mechanism includes a closing motor and a drive wheel mounted on the output shaft of the closing motor, as well as a driven wheel meshing with the drive wheel. The drive wheel is vertically mounted on the PCB control board via a mounting shaft on one side of the drive wheel, and the driven wheel is vertically mounted on the PCB control board via a mounting shaft on one side of the driven wheel. The opening mechanism includes a horizontally mounted opening electromagnet at the bottom of the PCB control board. The driving wheel is an incomplete gear with several meshing teeth on its upper part. It is connected to the output shaft of the closing motor reducer. An open groove is provided on the side of the driving wheel, and transition slopes are provided on both sides of the open groove. The driven wheel is also an incomplete gear with several meshing teeth on its upper part. An exhaust hole is provided on one side of the center of the driven wheel, and a triangular shaft is provided on the other side. An electric handle is fitted onto the triangular shaft. An open groove is provided on the side of the driven wheel, and transition slopes are provided on both sides of the open groove. The electric handle is cylindrical, with an exhaust hole at one end and a triangular shaft hole at the other end. A tripping limit block and a closing limit block are provided on the side of the electric handle. A tripping link hole is provided in the tripping limit block, and a tripping link is provided in the tripping link hole, connecting to the circuit breaker's operating handle. A closing link hole is provided in the closing limit block, and a closing link is provided in the closing link hole, connecting to the circuit breaker's contact operating mechanism. The incoming line mechanism includes an incoming line socket and a gold finger slot. The incoming line socket is two-pole and is located on the rear side of the plug-in circuit breaker. One-pole incoming line socket is located on top, and the other-pole incoming line socket is located on the bottom. Between the two-pole incoming line sockets, a gold finger slot for data acquisition and communication with the plug-in circuit breaker is provided. The outgoing line mechanism includes a fastening screw and a wiring cavity. The fastening screw and wiring cavity are located on the front side of the plug-in circuit breaker. The fastening screw is located on the upper part of the wiring cavity. The two-pole fastening screw and wiring cavity are arranged side by side, and an arc-damping plate is provided between the two poles.

2. The electrically operated mechanism of the plug-in circuit breaker according to claim 1, characterized in that: The micro switch includes a closed position switch, an open position switch, and a power-off switch. The micro switch is mounted on the PCB control board and operates in conjunction with the driving wheel and the driven wheel.

3. The electrically operated mechanism of the plug-in circuit breaker according to claim 1, characterized in that: The closing mechanism includes a closing motor and a driving wheel mounted on the output shaft of the closing motor, as well as a driven wheel meshing with the driving wheel. A reduction gearbox is located on one side of the closing motor, and the output shaft of the reduction gearbox is connected to the driving wheel. The incomplete teeth of the driving wheel mesh with the incomplete teeth of the driven wheel. A triangular shaft is located on one side of the center of the driven wheel, and an electric handle is fitted around the triangular shaft. When the circuit breaker needs to be closed, the PCB control board sends a closing signal, causing the closing motor to rotate clockwise. The driving wheel also rotates, and the meshing teeth of the driving wheel drive the meshing teeth of the driven wheel to rotate counterclockwise, thus driving the electric handle to rotate counterclockwise. An electric handle is located on one side of the electric handle. The operating handle and closing linkage actuate to push the contact actuation mechanism to close the circuit breaker. After the plug-in circuit breaker is closed, the meshing teeth of the driving wheel and the driven wheel disengage, and the driving wheel and the driven wheel separate. At this time, the groove slope on one side of the driven wheel presses against the closing position switch and closes it to detect whether the plug-in circuit breaker is closed. After the driving wheel continues to rotate at an angle, the de-energized position switch is pressed against the groove slope on the driving wheel and disconnected, so that the closing motor is de-energized and the driving wheel stops rotating. After the driving wheel stops rotating, the meshing teeth of the driving wheel and the driven wheel disengage. At this time, the circuit breaker can be manually opened and closed. The open and close position switch of the driven wheel can detect whether the plug-in circuit breaker is in the open or closed state.

4. The electrically operated mechanism of the plug-in circuit breaker according to claim 1, characterized in that: The tripping mechanism includes a tripping electromagnet and a tripping release lever. When the plug-in circuit breaker needs to be tripped, the PCB control board sends a tripping signal to energize the tripping electromagnet. The moving iron core of the tripping electromagnet pushes the release lever of the plug-in circuit breaker, causing the contact action mechanism to trip. At this time, the closing position switch is released and de-energized, the electric handle is reset under the action of the toggle spring, and the tripping position switch is closed by the groove slope of the driven wheel to detect whether the plug-in circuit breaker has tripped.

5. The electrically operated mechanism of the plug-in circuit breaker according to claim 1, characterized in that: The PCB control board also includes a flexible PCB board, which connects the PCB control board and the gold finger slot to realize data acquisition and communication connection of the plug-in circuit breaker.

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