Handcart type vacuum circuit breaker

Abstract

The utility model discloses a handcart type vacuum circuit breaker, which comprises a cabinet body and a circuit breaker body, a transverse partition plate is arranged in the cabinet body, the cabinet body is divided into an upper compartment and a lower compartment through the transverse partition plate, the circuit breaker body is arranged in the lower compartment, and a connecting device is arranged in the upper compartment; a longitudinal partition plate is further arranged in the lower compartment, the lower compartment is divided into an energy storage chamber, a handcart control chamber and a voltage transformer chamber through the longitudinal partition plate, a cable incoming and outgoing line unit is arranged in the energy storage chamber, an operating mechanism is arranged in the handcart control chamber, and a voltage transformer is arranged in the voltage transformer chamber. And solid insulating materials are arranged at high-voltage electrified parts of the cable inlet and outlet unit, the operating mechanism and the voltage transformer, so that mutual insulation between phases and between phases and a grounding system is realized. The handcart type vacuum circuit breaker provided by the utility model is simple in overall structure, provides technical support for the handcart type vacuum circuit breaker in the application of power distribution miniaturization design, and is suitable for popularization and application.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum circuit breakers, in particular to a trolley type vacuum circuit breaker. Background Art

[0002] Vacuum circuit breakers are circuit breakers that use vacuum state for arc extinguishing and insulation. Vacuum circuit breakers are mainly used in 10-35kV power systems. They can be frequently operated and continuously break rated currents for more than 10,000 times. They can also continuously break dozens or even hundreds of times under rated short-circuit breaking currents. They can be used for protection and control of electrical equipment in industrial and mining enterprises, power plants, and substations. The basic structure consists of a vacuum arc extinguishing chamber (vacuum switch tube), an insulating bracket, and an operating mechanism. Vacuum circuit breakers are widely used in distribution networks because of their small size, light weight, and suitability for frequent operation and arc extinguishing without maintenance.

[0003] In the existing high-voltage AC vacuum switch cabinet, a trolley vacuum circuit breaker is generally installed. When a switch failure occurs in a section of the main supply line, the backup supply line can be put into the working position to achieve the purpose of supplying power to the main supply line with the backup supply line, ensuring the normal operation of the main and backup supply line loads. Due to the particularity of the above scheme, the trolley vacuum circuit breaker cannot be put into the working position from the test position or returned to the test position at will when in the working position without certain conditions. This requires the trolley vacuum circuit breaker to have a locking function. At present, the more commonly used locking method is to use electrical locking. When the trolley vacuum circuit breaker exits the working position, the incoming line switch will trip. This locking method is passive, that is, the trolley vacuum circuit breaker is controlled by other factors. The disadvantage of this interlocking method is that when the control power is off, the interlocking will lose its function, which is prone to misoperation and cause major accidents such as arcing between phases. In addition, most of the existing trolley-type vacuum circuit breakers are installed upright, with a chassis at the bottom moving back and forth in the horizontal direction. The operating mechanism will contact the drive motor under the reaction force of the energy storage spring, which can easily cause the drive motor to vibrate, thereby affecting its operation. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a trolley-type vacuum circuit breaker with a simple structure, convenient operation and use, which adopts a side-mounted structure for limit fixing and adopts a bottom limit method for interlocking control. It can not only effectively prevent accidents caused by shaking when the circuit breaker is working, but also ensure that the operating mechanism will not conflict with the drive motor when resetting, so as to ensure that the drive motor can work stably, thereby meeting the use requirements. Specifically, it is a trolley-type vacuum circuit breaker.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a trolley type vacuum circuit breaker, comprising a cabinet and a circuit breaker body, wherein a transverse partition is arranged in the cabinet, and the cabinet is divided into an upper compartment and a lower compartment by the transverse partition, and the circuit breaker body is arranged in the lower compartment, and a connecting device electrically connected to the circuit breaker body is arranged in the upper compartment, and a wiring terminal is arranged in the connecting device; two longitudinal partitions are also arranged in the lower compartment, and the lower compartment is divided into an energy storage room, a trolley control room and a voltage transformer room by the two longitudinal partitions. A cable inlet and outlet unit is provided in the energy storage room, an operating mechanism is provided in the trolley control room, and a voltage transformer is provided in the voltage transformer room. The operating mechanism includes a switch power interlocking mechanism arranged in the trolley control room, and also includes a substrate, a limit mechanism arranged on the substrate and connected to the switch power interlocking mechanism, and a limit assembly connected to the limit mechanism; and solid insulating materials are provided at high-voltage live parts of the cable inlet and outlet unit, the operating mechanism and the voltage transformer to achieve mutual insulation between phases and between phases and the grounding system.

[0006] Furthermore, a trolley-type vacuum circuit breaker described in the utility model is adopted, and the circuit breaker body includes a driving motor and an energy storage mechanism, the driving motor is located between two longitudinal partitions in the trolley control room, and the energy storage mechanism is arranged in the energy storage room, the driving part of the driving motor extends to the outside of the longitudinal partition toward the side where the substrate is provided, and the switch power interlocking mechanism is located outside the driving part of the driving motor. The switch power interlocking mechanism includes a switch button and a linkage mechanism, the switch button is located above the driving motor, and the linkage mechanism is located below the driving motor, the switch button and the linkage mechanism are respectively connected to the energy storage mechanism, and the limit assembly is connected to the linkage mechanism.

[0007] Furthermore, a trolley-type vacuum circuit breaker described in the utility model is adopted, and the limit assembly includes a rotating shaft, an insulating pull rod, a crank arm, a connecting shaft seat and an energy storage spring. The two ends of the rotating shaft are rotatably connected to the inner wall surface of the lower compartment, and a connecting shaft seat is respectively provided on both sides and the middle of the rotating shaft. The rotating shaft is rotatably connected to the connecting shaft seat through the crank arm, and an energy storage spring in contact with the crank arm is provided on the lower side of the crank arm. A connecting piece is provided in the voltage transformer chamber, and the voltage transformer is connected to the voltage transformer chamber through the connecting piece. The upper end of the insulating pull rod is connected to the connecting piece, and the lower end thereof is rotatably connected to the corresponding crank arm; the limit mechanism is connected to the rotating shaft.

[0008] Furthermore, a trolley-type vacuum circuit breaker described in the utility model is adopted, and the limiting mechanism includes a support plate, an upper gear assembly, a lower gear assembly and a connecting shaft, the support plate is arranged on the base plate, and the upper gear assembly and the lower gear assembly are arranged between the longitudinal partition and the support plate, and the upper gear assembly and the lower gear assembly are meshed with each other to form a transmission component, wherein the upper gear assembly is connected to the linkage mechanism in the switch power interlocking mechanism through the connecting shaft, and the lower gear assembly is sleeved in the rotating shaft, and the lower gear assembly is driven to rotate through the rotating shaft, and the upper gear assembly is driven to rotate synchronously.

[0009] Furthermore, a trolley-type vacuum circuit breaker described in the utility model is adopted, and the circuit breaker body also includes a main circuit breaker and a backup circuit breaker, the main circuit breaker and the backup circuit breaker are respectively electrically connected to the connecting device, and the main circuit breaker and the backup circuit breaker are respectively provided with an interlocking structure that can switch between a working position and a test position, and the interlocking structure is connected to the operating mechanism in the trolley control room.

[0010] Furthermore, a trolley-type vacuum circuit breaker described in the utility model is adopted, and the cabinet includes an upper trapezoidal portion and a lower square portion to form an integrated cavity structure, and an operation panel and a switch door corresponding to the voltage transformer chamber are also provided on the cabinet, four mounting screw holes are provided at the bottom of the cabinet, and a supporting circular groove corresponding to the energy storage spring is also provided at the bottom of the cabinet.

[0011] A trolley type vacuum circuit breaker described in the utility model is adopted. The lower compartment in the cabinet is divided into three cavities by two longitudinal partitions arranged in the cabinet. A side-mounted structure is adopted, which greatly reduces the overall width and length of the cabinet, thereby realizing the requirement of miniaturization of the power distribution equipment. In addition, since the operating mechanism includes a switch power interlocking mechanism, a limit mechanism and a limit assembly, the cooperation of the limit mechanism and the limit assembly effectively solves the problem of fixed limit of the trolley type vacuum circuit breaker in the cabinet, and adopts a bottom limit method for interlocking control, which can effectively prevent accidents caused by shaking when the circuit breaker is working, thereby ensuring that the operating mechanism will not conflict with the drive motor when resetting, so as to ensure that the drive motor can work stably, and the operation is safer and more reliable, thereby meeting the use requirements. Its overall structure is simple, which provides technical support for the application of trolley type vacuum circuit breakers in the design of miniaturized power distribution, and is suitable for popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 for Figure 1Schematic diagram of the local structure;

[0015] Figure 3 It is a schematic diagram of the lateral structure of the cabinet described in the utility model;

[0016] Figure 4 It is a schematic diagram of the bottom structure of the cabinet described in the utility model.

[0017] As shown in the figure: 1-cabinet, 11-horizontal partition, 12-longitudinal partition, 2-connecting device, 3-cable inlet and outlet unit, 4-operating mechanism, 41-switch power interlocking mechanism, 411-switch button, 412-linkage mechanism, 42-base plate, 43-limiting assembly, 431-rotating shaft, 432-insulating pull rod, 433-crank arm, 434-connecting shaft seat, 435-energy storage spring, 44-limiting mechanism, 5-voltage transformer, 6-driving motor, 7-energy storage mechanism, 8-connecting piece, 9-mounting screw hole, 10-support circular groove. DETAILED DESCRIPTION

[0018] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0019] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", etc. quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] It should be noted that the term "comprise" or any other variation is intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus. Example 1

[0022] like Figures 1 to 4 As shown, a trolley type vacuum circuit breaker described in this embodiment includes a cabinet 1 and a circuit breaker body, a transverse partition 11 is provided in the cabinet 1, and the cabinet 1 is divided into an upper compartment and a lower compartment by the transverse partition 11, and the circuit breaker body is arranged in the lower compartment, and a connecting device 2 electrically connected to the circuit breaker body is provided in the upper compartment, and a terminal is configured in the connecting device 2 for connecting to an external wire; two longitudinal partitions 12 are also provided in the lower compartment, and the lower compartment is divided into an energy storage chamber, a trolley control chamber and a voltage transformer chamber by the two longitudinal partitions, a cable inlet and outlet unit 3 is provided in the energy storage chamber, an operating mechanism 4 is provided in the trolley control chamber, and a voltage transformer 5 is provided in the voltage transformer chamber, and the operating mechanism 4 includes a terminal arranged at The switch power interlock mechanism 41 in the trolley control room also includes a substrate 42, and a limit mechanism 44 arranged on the substrate 42 and connected to the switch power interlock mechanism 41, and also includes a limit assembly 43 connected to the limit mechanism 44; and solid insulating materials are provided at the high-voltage live parts of the cable inlet and outlet unit 3, the operating mechanism 4 and the voltage transformer 5 to achieve mutual insulation between phases and between phases and the grounding system; the circuit breaker body also includes a main circuit breaker and a backup circuit breaker, the main circuit breaker and the backup circuit breaker are respectively electrically connected to the connecting device 2, and the main circuit breaker and the backup circuit breaker are respectively provided with an interlocking structure that can switch between the working position and the test position, and the interlocking structure is connected to the operating mechanism 4 in the trolley control room.

[0023] Furthermore, a trolley-type vacuum circuit breaker described in this embodiment is adopted, and the circuit breaker body includes a drive motor 6 and an energy storage mechanism 7, the drive motor 6 is located between two longitudinal partitions 12 in the trolley control room, and the energy storage mechanism 7 is arranged in the energy storage room, the drive part of the drive motor 6 extends to the outside of the longitudinal partition 12 toward the side where the substrate 42 is provided, and the switch power interlocking mechanism 41 is located outside the drive part of the drive motor 6, and the switch power interlocking mechanism 41 includes a switch button 411 and a linkage mechanism 412, the switch button 411 is located above the drive motor 6, and the linkage mechanism 412 is located below the drive motor 6, the switch button 411 and the linkage mechanism 412 are respectively connected to the energy storage mechanism 7, and the limit assembly 43 is connected to the linkage mechanism 412. Among them, the limiting assembly 43 includes a rotating shaft 431, an insulating pull rod 432, a crank arm 433, a connecting shaft seat 434 and an energy storage spring 435. The two ends of the rotating shaft 431 are rotatably connected to the inner wall surface of the lower compartment. A connecting shaft seat 434 is respectively provided on both sides and the middle of the rotating shaft 431. The rotating shaft 431 is rotatably connected to the connecting shaft seat 434 through the crank arm 433, and an energy storage spring 435 in contact with the crank arm 433 is provided on the lower side of the crank arm 433. A connecting piece 8 is provided in the voltage transformer chamber, and the voltage transformer 5 is connected to the voltage transformer chamber through the connecting piece 8. The upper end of the insulating pull rod 432 is connected to the connecting piece 8, and the lower end thereof is rotatably connected to the corresponding crank arm 433; the limiting mechanism 44 is connected to the rotating shaft 431.

[0024] Furthermore, a trolley-type vacuum circuit breaker described in this embodiment is adopted, and the limiting mechanism 44 includes a support plate, an upper gear assembly, a lower gear assembly and a connecting shaft, the support plate is arranged on the base plate 42, and the upper gear assembly and the lower gear assembly are arranged between the longitudinal partition 12 and the support plate, and the upper gear assembly and the lower gear assembly are meshed with each other to form a transmission component, wherein the upper gear assembly is connected to the linkage mechanism 412 in the switch power interlocking mechanism 41 through the connecting shaft, and the lower gear assembly is sleeved in the rotating shaft 431, and the lower gear assembly is driven to rotate through the rotating shaft 431, and the upper gear assembly is driven to rotate synchronously. Its working principle is to utilize the energy storage mechanism 7 in the circuit breaker body. When closing operation is required, the driving motor 6 provides power, and the linkage mechanism 412 drives the upper gear assembly to rotate, and under the action of the lower gear assembly, the purpose of reducing the rotation speed and increasing the torque is achieved, so that the energy storage medium (spring) in the energy storage mechanism 7 is stretched, compressed or rotated to store energy. When the energy storage mechanism 7 is quickly rotated to the stop position, the micro switch is actuated, and the motor current is cut off, so that the energy storage mechanism 7 finally stops at the stop position, that is, the output force of the energy storage mechanism 7 acts on the closing lock to achieve the closing operation, and the process of the opening operation is opposite to the closing operation. This is a common operation mode of closing and opening of vacuum circuit breakers, so its specific linkage structure and operation process are not described in detail here. Example 2

[0025] This embodiment is based on the embodiment 1. In order to facilitate the installation and movement of the cabinet 1 and to better meet the use requirements, so as to support and position the energy storage spring 435, the cabinet 1 includes an upper trapezoidal portion and a lower square portion to form an integrated cavity structure. The cabinet 1 is also provided with an operation panel and a switch door corresponding to the voltage transformer room. Four mounting screw holes 9 are provided at the bottom of the cabinet 1, and a supporting circular groove 10 corresponding to the energy storage spring 435 is also provided at the bottom of the cabinet 1. The four mounting screw holes 9 are configured to facilitate installation and fixing with screws. In the specific manufacturing process, the length of the cabinet 1 can reach 588 mm, the width can reach 395 mm, and the height can reach 440 mm, which greatly reduces the floor space, saves costs, and realizes the requirements of miniaturization of power distribution equipment.

[0026] A trolley type vacuum circuit breaker described in the utility model is adopted. Since a connecting device 2 electrically connected to the circuit breaker body is provided in the upper compartment, corresponding wiring terminals are arranged in the connecting device 2 to facilitate external equipment. At the same time, solid insulating materials are provided at high voltage live parts of the cable inlet and outlet units 3, operating mechanisms 4 and voltage transformers 5 to achieve mutual insulation between phases and between phases and grounding systems, thereby achieving respective conduction, isolation, grounding protection, load short-circuit protection and electrical appliance communication in the cabinet, so as to meet the requirements of the user's power supply and distribution system. In the specific application process, when the main supply circuit breaker and the main supply incoming line circuit breaker are to work, the main supply incoming line circuit breaker is moved from the test position to the working position through the configured operating mechanism 4, so that the main supply incoming line circuit breaker can be closed and can work normally. At the same time, the backup circuit breaker and the backup supply incoming line circuit breaker are in a locked state in the test position, and the backup circuit breaker cannot move, thereby realizing the interlocking between the main supply circuit breaker and the backup circuit breaker, ensuring that one is in the working position and the other can only be in the test position, and realizing reliable control of the vacuum circuit breaker. In addition, since the switch power interlocking mechanism 41 is located outside the driving part of the drive motor 6, and the limit assembly 43 can be reset by itself under the action of the energy storage spring 435, and will not touch the drive motor 6 during the resetting process, thereby playing a good protective role for the drive motor 6.

[0027] In summary, the trolley type vacuum circuit breaker described in the utility model has a simple overall structure, provides technical support for the application of the trolley type vacuum circuit breaker in the miniaturized design of power distribution, and is suitable for popularization and application.

[0028] Other details of the present invention are all conventional techniques known to those skilled in the art.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, various changes and variations are possible. Any modifications, equivalent substitutions, improvements, etc. made using the present invention should be included in the protection scope of the present invention.

Claims

1. A trolley type vacuum circuit breaker, comprising a cabinet and a circuit breaker body, characterized in that: A transverse partition is provided in the cabinet, and the cabinet is divided into an upper compartment and a lower compartment by the transverse partition. The circuit breaker body is arranged in the lower compartment, and a connection device electrically connected to the circuit breaker body is provided in the upper compartment, and a wiring terminal is arranged in the connection device; two longitudinal partitions are also provided in the lower compartment, and the lower compartment is divided into an energy storage chamber, a trolley control chamber and a voltage transformer chamber by the two longitudinal partitions, a cable inlet and outlet unit is provided in the energy storage chamber, an operating mechanism is provided in the trolley control chamber, and a voltage transformer is provided in the voltage transformer chamber, the operating mechanism includes a switch power interlocking mechanism arranged in the trolley control chamber, and also includes a substrate, a limit mechanism arranged on the substrate and connected to the switch power interlocking mechanism, and a limit assembly connected to the limit mechanism; and solid insulating materials are provided at the high-voltage live parts of the cable inlet and outlet unit, the operating mechanism and the voltage transformer to achieve mutual insulation between phases and between phases and the grounding system.

2. A trolley type vacuum circuit breaker according to claim 1, characterized in that: The circuit breaker body includes a drive motor and an energy storage mechanism, the drive motor is located between two longitudinal partitions in the trolley control room, and the energy storage mechanism is arranged in the energy storage room, the drive part of the drive motor extends to the outside of the longitudinal partition toward the side where the substrate is provided, the switch power interlocking mechanism is located outside the drive part of the drive motor, the switch power interlocking mechanism includes a switch button and a linkage mechanism, the switch button is located above the drive motor, the linkage mechanism is located below the drive motor, the switch button and the linkage mechanism are respectively connected to the energy storage mechanism, and the limit assembly is connected to the linkage mechanism.

3. A trolley type vacuum circuit breaker according to claim 2, characterized in that: The limiting assembly includes a rotating shaft, an insulating pull rod, a crank arm, a connecting shaft seat and an energy storage spring. The two ends of the rotating shaft are rotatably connected to the inner wall surface of the lower compartment. A connecting shaft seat is respectively provided on both sides and the middle of the rotating shaft. The rotating shaft is rotatably connected to the connecting shaft seat through the crank arm, and an energy storage spring in contact with the crank arm is provided on the lower side of the crank arm. A connecting piece is provided in the voltage transformer chamber, and the voltage transformer is connected to the voltage transformer chamber through the connecting piece. The upper end of the insulating pull rod is connected to the connecting piece, and the lower end thereof is rotatably connected to the corresponding crank arm; the limiting mechanism is connected to the rotating shaft.

4. A trolley type vacuum circuit breaker according to claim 3, characterized in that: The limiting mechanism includes a support plate, an upper gear assembly, a lower gear assembly and a connecting shaft, wherein the support plate is arranged on a base plate, and the upper gear assembly and the lower gear assembly are arranged between the longitudinal partition plate and the support plate, and the upper gear assembly and the lower gear assembly are meshed with each other to form a transmission component, wherein the upper gear assembly is connected to the linkage mechanism in the switch power interlocking mechanism through the connecting shaft, and the lower gear assembly is sleeved in the rotating shaft, and the lower gear assembly is driven to rotate through the rotating shaft, and the upper gear assembly is driven to rotate synchronously.

5. A trolley type vacuum circuit breaker according to claim 4, characterized in that: The circuit breaker body also includes a main circuit breaker and a backup circuit breaker, which are electrically connected to a connection device installed in the cabinet, and are respectively provided with an interlocking structure capable of switching between a working position and a test position, and the interlocking structure is connected to an operating mechanism in a trolley control room.

6. A trolley type vacuum circuit breaker according to claim 5, characterized in that: The cabinet body includes an upper trapezoidal portion and a lower square portion to form an integrated cavity structure. An operation panel and a switch door corresponding to the voltage transformer chamber are also provided on the cabinet body. Four mounting screw holes are provided at the bottom of the cabinet body. A supporting circular groove corresponding to the energy storage spring is also provided at the bottom of the cabinet body.

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