Novel molded case circuit breaker electric operating mechanism

Abstract

The utility model relates to a novel molded case circuit breaker electric operating mechanism, which comprises a molded case circuit breaker, a bottom plate, a motor, a screw rod, a handle sleeve and a nut. The motor is installed below a molded case circuit breaker handle, the extending part of a rotating shaft is connected with the screw, and the nut is fixedly installed on the top of the handle sleeve and is in threaded connection with the screw. When the motor drives the screw rod to rotate, the nut moves along the axial direction of the screw rod to drive the handle sleeve and the handle to complete opening and closing actions of the molded case circuit breaker. In addition, limiting rods are installed at the left end and the right end of the handle sleeve and used for triggering the corresponding closing or opening limiting switch when the handle is opened and closed in place, and the control circuit board controls the motor to stop working after receiving signals of the limiting switches. The screw is directly driven by the motor, the internal structure of the electric operating mechanism of the molded case circuit breaker is simplified, and the electric operating mechanism has the advantages of simple structure, low height, small size, high reliability and the like, and is particularly suitable for application scenes with small space and high reliability requirements on motor train units.

Description

Technical Field

[0001] This utility model relates to the field of rail transit electrical equipment, and in particular to a novel electric operating mechanism for molded case circuit breakers. Background Technology

[0002] In the field of rail transit electrical technology, especially in high-speed trains, certain applications require the use of molded case circuit breakers equipped with electric operating devices to perform remote opening and closing actions. This is because high-speed trains require precise control of their electrical systems during operation, and as a crucial component of the electrical system, the reliability and convenience of the molded case circuit breaker's opening and closing operation directly affect the operational safety of the high-speed train.

[0003] Current electric operating mechanisms for new molded case circuit breakers typically employ gear-driven structures. This structure transmits power through gear meshing to achieve the opening and closing operations of the circuit breaker. These electric operating devices are often large in size and height to accommodate their complex internal gear transmission mechanisms.

[0004] However, in the confined space within the electrical cabinet of a high-speed train, existing large and tall electric operating devices are unsuitable for this environment. Furthermore, current electric operating mechanisms typically employ gear transmission structures, which are complex internally and difficult to meet the high reliability requirements of high-speed trains. Utility Model Content

[0005] In view of this, it is necessary to provide a new type of electrically operated mechanism for molded case circuit breakers to overcome the above-mentioned deficiencies of the prior art.

[0006] To address the aforementioned problems, this utility model provides a novel electrically operated mechanism for a molded case circuit breaker, comprising:

[0007] Molded case circuit breakers are fixedly installed on the base plate;

[0008] The base plate is used to support the various components of the electric operating mechanism;

[0009] The electric motor is mounted on the base plate below the handle of the molded case circuit breaker, and the extended part of the motor's rotating shaft is connected to the screw.

[0010] The screw is fixedly mounted on the rotating shaft of the electric motor;

[0011] A handle sleeve is installed on the handle of the molded case circuit breaker, and a nut is fixedly installed on the top of the handle sleeve;

[0012] The nut, connected to the screw via a thread, moves axially along the screw as it rotates, thereby driving the handle to open and close the molded case circuit breaker.

[0013] Preferably, the electric operating mechanism of the novel molded case circuit breaker further includes:

[0014] The limit rod is fixedly installed on both ends of the handle sleeve and is used to drive the contacts of the opening and closing limit switch to move when the handle is in the opening and closing action.

[0015] The closing limit switch is fixedly installed on the base plate. The closing limit switch is installed at the position where the limit rod is in the closed position. After the molded case circuit breaker is closed, the closing limit switch is closed by the limit rod.

[0016] The trip limit switch is fixedly installed on the base plate. The trip limit switch is installed at the position where the limit rod is in the tripped position. After the molded case circuit breaker is in the tripped position, the limit rod drives the trip limit switch to close.

[0017] Preferably, the electric operating mechanism of the novel molded case circuit breaker further includes:

[0018] The control circuit board connects to the external power supply and the motor, and is used to power the motor.

[0019] Preferably, the control circuit board is also connected to a closing limit switch and a closing limit switch, and is used to control the motor to stop working when the limit switch outputs an arrival signal.

[0020] The novel electrically operated mechanism for molded case circuit breakers provided by this utility model has the following advantages compared with the prior art:

[0021] This invention directly drives the actuating screw with an electric motor, which in turn drives the handle sleeve and handle via a follower nut, thus realizing the opening and closing of the molded case circuit breaker and simplifying the internal structure of the electric operating mechanism. This invention features a simple structure, low height, small size, and high reliability. It is suitable for applications with limited space and high reliability requirements, such as high-speed trains. Attached Figure Description

[0022] Figure 1 A schematic diagram of the structure of the novel molded case circuit breaker electric operating mechanism provided in this embodiment of the utility model;

[0023] Figure 2(a) is a schematic diagram of the structure of a molded case circuit breaker;

[0024] Figure 2(b) shows the effect of installing the electric operating mechanism on the molded case circuit breaker;

[0025] In the attached diagram, 1: Molded case circuit breaker; 2: Base plate; 3: Motor; 4: Screw; 5: Handle sleeve; 6: Nut; 7: Limit rod; 8: Closing limit switch; 9: Opening limit switch; 10: Control circuit board. Detailed Implementation

[0026] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] Current electric operating mechanisms for new molded case circuit breakers typically employ gear-driven structures. This type of structure transmits power through gear meshing to achieve the opening and closing operations of the circuit breaker. These electric operating devices are often large and tall to accommodate their complex internal gear transmission mechanisms. However, in the confined space of high-speed train electrical cabinets, these existing large and tall electric operating devices are unsuitable for the limited space. Furthermore, the current gear-driven structures of electric operating mechanisms are complex and difficult to meet the high reliability requirements of high-speed trains.

[0029] In view of this, this utility model designs a novel electrically operated mechanism for molded case circuit breakers that is highly reliable, low in height, and small in size, suitable for high-speed trains. The following will elaborate and describe this mechanism through several embodiments.

[0030] Figure 1 A schematic diagram of the structure of the novel electrically operated mechanism for a molded case circuit breaker provided in this embodiment of the utility model is shown below. Figure 1 As shown, the electric operating mechanism of the new molded case circuit breaker includes:

[0031] Molded case circuit breaker 1 is fixedly installed on base plate 2;

[0032] Base plate 2 is used to support the various components of the electric operating mechanism;

[0033] Motor 3 is mounted on the base plate below the handle of the molded case circuit breaker, and the extended part of the rotating shaft of motor 3 is connected to screw 4;

[0034] Screw 4 is fixedly mounted on the rotating shaft of motor 3;

[0035] Handle sleeve 5 is installed on the handle of the molded case circuit breaker 1, and a nut 6 is fixedly installed on the top of the handle sleeve;

[0036] Nut 6 is threadedly connected to the screw and is used to move along the axial direction of the screw as it rotates, thereby driving the handle to complete the opening and closing of the molded case circuit breaker.

[0037] Specifically, refer to Figure 1 The molded case circuit breaker 1 is fixedly mounted on the base plate 2 and is responsible for the opening and closing functions of the circuit. The base plate 2 is the supporting structure of the electric operating mechanism of the new molded case circuit breaker, used to support the various components of the electric operating mechanism. The function of the motor 3 is to drive the nut 6 to move through the screw 4 extending from its rotating shaft, thereby driving the handle sleeve 5 to complete the opening and closing of the molded case circuit breaker. The screw 4 is the extended part of the rotating shaft of the motor 3 and has a threaded structure. The handle sleeve 5 is a structural component installed on the handle of the molded case circuit breaker 1, used to transmit the driving force of the motor to the handle. The nut 6 is connected to the screw 4 through threads. When the motor 3 drives the screw 4 to rotate, the nut 6 will move forward or backward along the axial direction of the screw 4, thereby driving the handle sleeve and the handle to complete the opening and closing action of the molded case circuit breaker.

[0038] This invention directly drives the operating screw with an electric motor, and then drives the handle sleeve and handle to move through the follower nut, thereby realizing the opening and closing of the molded case circuit breaker and simplifying the internal structure of the electric operating mechanism of the molded case circuit breaker.

[0039] Figure 2(a) is a structural schematic diagram of the molded case circuit breaker; Figure 2(b) is a rendering of the molded case circuit breaker after the electric operating mechanism is installed. As shown in Figure 2(b), this utility model has a simple structure, low height, small size, and high reliability. It is suitable for applications where space is limited and reliability requirements are high, such as high-speed trains.

[0040] In a preferred embodiment of this utility model, the novel molded case circuit breaker electric operating mechanism further includes:

[0041] Limit rod 7 is fixedly installed on both ends of the handle sleeve and is used to drive the contacts of the opening and closing limit switch to move when the handle is in the opening and closing action.

[0042] The closing limit switch 8 is fixedly installed on the base plate 2. The closing limit switch is installed at the position of the limit rod 7 when the circuit breaker is closed. After the molded case circuit breaker is closed, the closing limit switch 8 is closed by the limit rod 7.

[0043] The trip limit switch 9 is fixedly installed on the base plate 2. The trip limit switch is installed at the position of the limit rod 7 when the circuit breaker is in the tripped position. After the molded case circuit breaker is in the tripped position, the limit rod 7 drives the trip limit switch 9 to close.

[0044] The control circuit board 10 connects to an external power supply and a motor, and is used to supply power to the motor. The control circuit board 10 is also connected to a closing limit switch 8 and a opening limit switch 9, and is used to control the motor to stop working when a limit switch outputs a position signal. It is understood that the control circuit board used in this application is commercially available, and the control principle of the control circuit board is prior art known to those skilled in the art. This application does not improve the control method of the control circuit board.

[0045] Specifically, in actual operation, when a closing or opening operation is required, the control circuit board 10 first receives a closing or opening signal from the outside. Based on the received signal, the control circuit board 10 determines the rotation direction of the motor 3 (forward or reverse). Then, the control circuit board 10 converts the DC110V current input from the external power supply into DC24V current to power the motor 3, and the motor 3 begins to rotate.

[0046] Next, the rotating shaft of the motor 3 drives the screw 4 to rotate, and the rotation of the screw 4 drives the nut 6 to move axially along the screw 4 through a threaded connection. The movement of the nut 6 drives the handle sleeve 5 to move, which in turn drives the handle of the molded case circuit breaker 1 to perform the opening or closing action.

[0047] Furthermore, when the handle is moved to the closed or open position, the limit rod 7 on the handle sleeve 5 will trigger the corresponding closed limit switch 8 or open limit switch 9. The contacts of the limit switches actuate, outputting a position signal to the control circuit board 10. After receiving the position signal from the limit switch, the control circuit board 10 controls the motor 3 to stop working. At this time, the screw 4 stops rotating, the nut 6 and the handle sleeve 5 stop moving, and the molded case circuit breaker 1 remains in the closed or open state.

[0048] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise expressly specified and limited, the terms "installed," "connected," or "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection via an intermediate medium; or a connection within two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0050] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A novel electrically operated mechanism for a molded case circuit breaker, characterized in that, include: A molded case circuit breaker (1) is fixedly installed on a base plate (2); The base plate (2) is used to support the various components of the electric operating mechanism; The motor (3) is installed on the base plate below the handle of the molded case circuit breaker, and the extended part of the rotating shaft of the motor (3) is connected to the screw (4). The screw (4) is fixedly installed on the rotating shaft of the motor (3); A handle sleeve (5) is installed on the handle of the molded case circuit breaker (1), and a nut (6) is fixedly installed on the top of the handle sleeve. The nut (6) is connected to the screw by a thread and is used to move along the axial direction of the screw as the screw rotates, thereby driving the handle to complete the opening and closing of the molded case circuit breaker.

2. The novel electrically operated mechanism for a molded case circuit breaker according to claim 1, characterized in that, Also includes: Limit rod (7) is fixedly installed on both ends of the handle sleeve and is used to drive the contacts of the opening and closing limit switch to move when the opening and closing action of the handle is in place; The closing limit switch (8) is fixedly installed on the base plate (2). The closing limit switch is installed on the limit rod (7) when the circuit breaker is closed. After the molded case circuit breaker is closed, the closing limit switch (8) is driven to close by the limit rod (7). The trip limit switch (9) is fixedly installed on the base plate (2). The trip limit switch is installed on the limit rod (7) when the circuit breaker is in the trip position. After the molded case circuit breaker is in the trip position, the limit rod (7) drives the trip limit switch (9) to close.

3. The novel electrically operated mechanism for a molded case circuit breaker according to claim 1, characterized in that, Also includes: The control circuit board (10) is connected to the external power supply and the motor to supply power to the motor.

4. The novel electrically operated mechanism for a molded case circuit breaker according to claim 3, characterized in that, The control circuit board (10) is also connected to the closing limit switch (8) and the opening limit switch (9).

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