Side-mounted vacuum circuit breaker ring network cabinet

Abstract

The application relates to the technical field of ring network cabinets, and particularly discloses a side-mounted vacuum circuit breaker ring network cabinet, which comprises a cabinet body, a side-mounted vacuum circuit breaker is installed in the cabinet body, a heat dissipation cylinder which can rotate along a vacuum cavity is arranged on the vacuum cavity of the vacuum circuit breaker, a through groove through which airflow can pass is arranged in the heat dissipation cylinder, a plurality of coil modules are arranged on the outer circumferential wall of the heat dissipation cylinder in the circumferential direction, a plurality of axial horizontal metal coils are arranged in each coil module in intervals, a plurality of electrified arc-shaped guide rails are arranged on the outer circumferential direction of the heat dissipation cylinder, the arc-shaped guide rails are not complete annular, the arc-shaped guide rails are arranged on the outer part of the coil modules in intervals, and each coil module is connected with the arc-shaped guide rails in one rotation of the heat dissipation cylinder, so that a magnetic field is formed between the coil modules. The scheme can solve the problem that the distribution of electric arcs in the vacuum cavity of the existing side-mounted vacuum circuit breaker is relatively concentrated, and the contact is damaged.

Description

Technical Field

[0001] This invention relates to the field of ring main unit technology, specifically to a side-mounted vacuum circuit breaker ring main unit. Background Technology

[0002] Ring main units (RMS) are one of the key pieces of equipment in the power supply industry. Vacuum circuit breaker RMS units are a type of high-voltage switchgear, with the vacuum circuit breaker as their core component. Due to limited installation space in some locations, side-mounted vacuum circuit breakers have emerged in the market. Side-mounted vacuum circuit breakers are devices used for circuit protection. They are installed laterally and can automatically disconnect the circuit when the current exceeds a predetermined value, thus protecting the circuit and equipment from damage. These circuit breakers are commonly used in household, industrial, and commercial circuits to protect various equipment from voltage fluctuations, overloads, short circuits, and other hazards.

[0003] Due to their unique structure and operating principle, heat dissipation is equally important for vacuum circuit breakers within ring main units. The contacts of a vacuum circuit breaker are housed within a vacuum chamber. During opening and closing operations, an electric arc exists between the two opposing contacts, generating a significant amount of heat. If this heat cannot be effectively dissipated, the contact temperature will rise, affecting the circuit breaker's performance and reliability. To address this heat dissipation issue, new designs and technologies can be employed to enhance the cooling effect of vacuum circuit breakers. For example, Chinese utility model patent CN219457441U discloses a vacuum circuit breaker for gas-insulated switchgear, including a mounting base and a circuit breaker body. The top of the mounting base is provided with a mounting groove, and one side of the mounting groove is provided with an opening. A connecting base is fixedly installed at the bottom of the circuit breaker body and is installed inside the mounting groove. The top of the mounting base is provided with a heat dissipation system, which includes a first electrically controlled cooling fan, a second electrically controlled cooling fan, a temperature sensor, and a controller. The first and second electrically controlled cooling fans are respectively installed on the top sides of the mounting base, and the airflow of the first and second electrically controlled cooling fans is the same. The temperature sensor is installed on the top rear side of the mounting base and close to the circuit breaker body. The controller is installed on the rear side of the mounting base, and the first and second electrically controlled cooling fans and the temperature sensor are all electrically connected to the controller.

[0004] The drawbacks of the above scheme are as follows: the vacuum chambers of the circuit breaker are vertically mounted on the base, and there are three vacuum chambers in the vacuum circuit breaker. Each vacuum chamber is a cylindrical shell, and the vacuum is used as the insulating medium inside the shell. The cooling fans are symmetrically positioned on the side walls of the two vacuum chambers that are furthest apart from each other. That is, the airflow direction of the cooling fans is perpendicular to the circumferential side wall of the vacuum chamber, and the airflow only contacts one side of the circumferential side wall. This results in uneven heat distribution around the entire vacuum chamber. After long-term operation, this can easily damage the structure of the vacuum circuit breaker. In addition, in a vacuum environment, the closing and opening of the circuit breaker will generate an electric arc between the two contacts. The arc makes point contact with the two contacts. The current magnitude and environmental conditions will also affect the arc distribution. If the current is too large or the ambient temperature is too high, the arc may become more concentrated. After single-point burning, the contacts may weld or stick together, causing contact damage. The uneven airflow distribution in the above scheme makes it easier for heat to accumulate in certain areas of the contact surface, while other areas may become too cold, reducing the service life of the entire vacuum circuit breaker. Summary of the Invention

[0005] The present invention provides a side-mounted vacuum circuit breaker ring main unit to solve the problem of contact damage caused by the concentrated distribution of electric arc in the vacuum cavity of existing side-mounted vacuum circuit breakers.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a side-mounted vacuum circuit breaker ring main unit, comprising a cabinet, wherein a side-mounted vacuum circuit breaker is installed inside the cabinet, and a heat dissipation cylinder that can rotate along the vacuum cavity is provided on the vacuum cavity of the vacuum circuit breaker. The heat dissipation cylinder is provided with a through groove through which airflow can pass. Several coil modules are arranged circumferentially on the outer peripheral wall of the heat dissipation cylinder, and several axially horizontal metal coils are spaced apart in each coil module. Several charged arc-shaped guide rails are arranged circumferentially on the outer periphery of the heat dissipation cylinder. The arc-shaped guide rails are not completely circular and are spaced apart outside the coil modules. Within one revolution of the heat dissipation cylinder, each coil module is connected to the arc-shaped guide rail, so that a magnetic field is formed between the coil modules.

[0007] The basic principle of this scheme is as follows: when the heat sink rotates one revolution, the coil module placed opposite to it contacts the arc-shaped guide rail, and the metal coil is energized through the arc-shaped guide rail, thereby forming a magnetic field in the metal coil. Since the coil modules are spaced apart along the circumference of the heat sink, magnetic fields in different directions are formed in the circumference of the heat sink. The magnetic field affects the appearance of the arc at different positions of the contacts, making the distribution of the arc random and preventing the arc from always being generated at a fixed point between the two contacts.

[0008] The beneficial effects of this plan are:

[0009] 1. The existing side-mounted vacuum circuit breaker uses a fan as its heat dissipation structure, and the fan is set at both ends of the two vacuum chambers. This results in uneven heat dissipation area on the vacuum chamber. Uneven heat dissipation will lead to uneven heat distribution in the entire vacuum chamber, which will affect the service life of the entire vacuum circuit breaker. This solution uses a cylindrical heat dissipation cylinder, which is designed to cover the circumferential sidewall of the vacuum chamber, to dissipate heat from the entire circumference of the vacuum chamber.

[0010] 2. In existing vacuum circuit breakers, an electric arc is generated between the contacts in the vacuum chamber during closing and opening. The arc is generated at a fixed point on the contact, causing welding and melting between the two contacts. This solution involves setting a rotatable heat sink on the circumferential sidewall of the entire vacuum chamber. At the same time, multiple coil modules are set at intervals on the outer wall of the heat sink. The coil modules form multiple intersecting magnetic fields in the circumferential direction of the vacuum chamber. The magnetic field affects the position of the arc generated in the vacuum chamber and achieves randomness in the generation of the arc.

[0011] Furthermore, several layers of axial flow blades are spaced at intervals along the height of the through groove in the heat dissipation cylinder, with each layer of axial flow blades spaced apart circumferentially around the heat dissipation cylinder. External air is drawn into the heat dissipation cylinder through these axial flow blades. After entering the heat dissipation cylinder, the air contacts the circumferential sidewalls of the vacuum chamber, thereby carrying away the heat from the vacuum chamber and achieving a uniform heat dissipation effect.

[0012] Furthermore, an external gear ring is provided along the circumference of the bottom side wall of the heat sink, and a gear meshes on the outer circumference of the external gear ring. The gear key is connected to the output shaft of the external motor, and the motor is electrically connected to the controller of the external device. The meshing structure of the gear and the external gear ring drives the entire heat sink to rotate, satisfying the requirements of air intake of the heat sink and changing the direction of the magnetic field on the coil module.

[0013] Furthermore, the coil module includes a cylindrical housing, the outer wall of which is arc-shaped to conform to the curvature of the arc-shaped guide rail. This allows the coil module to be powered on while conforming to the arc-shaped track as the entire heat sink rotates.

[0014] Furthermore, a horizontal partition is provided in the middle of the cabinet, and the side-mounted vacuum circuit breaker is installed on the upper surface of the partition.

[0015] Furthermore, there are four sets of coil modules and four sets of arc-shaped guide rails. The arc-shaped guide rails are arranged circumferentially on the outside of the heat sink, and the adjacent arc-shaped guide rails are spaced 90 degrees apart.

[0016] Furthermore, the coil module contains several sets of axially horizontal metal coils spaced from top to bottom.

[0017] Furthermore, the inner wall of the heat sink in contact with the vacuum chamber has several heat dissipation holes, which are spaced apart along the circumferential sidewall of the heat sink. These holes allow the air flowing inside the heat sink to contact the surface of the vacuum chamber, carrying away more heat. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an embodiment of the present invention;

[0019] Figure 2 This is a top view of an embodiment of the present invention on a single vacuum cavity;

[0020] Figure 3 This is a schematic diagram of an embodiment of the present invention on a single vacuum cavity. Detailed Implementation

[0021] The following detailed description illustrates the specific implementation method:

[0022] The reference numerals in the accompanying drawings include: cabinet 1, side-mounted vacuum circuit breaker 2, partition 3, vacuum chamber 4, heat sink 5, heat dissipation hole 51, bearing 52, axial flow blade 6, coil module 7, through slot 8, metal coil 9, arc-shaped guide rail 10, external gear ring 11, gear 12, motor 13.

[0023] The basic implementation examples are as follows: Figure 1 To be continued Figure 3 As shown:

[0024] The side-mounted vacuum circuit breaker ring main unit includes a cabinet 1 and a side-mounted vacuum circuit breaker 2. A partition 3 is horizontally fixed in the middle of the cabinet. The side-mounted vacuum circuit breaker 2 is horizontally installed on the upper surface of the partition 3. The side-mounted vacuum circuit breaker 2 includes an operating panel and three vacuum chambers 4. A heat dissipation cylinder 5 is sleeved on the outer circumference of the vacuum chamber 4. The heat dissipation cylinder 5 is cylindrical.

[0025] The two ends of the heat sink are connected to the two ends of the vacuum chamber by bearings 52. An external gear ring 11 is provided on the outer side wall of the bottom of the heat sink 5 along the circumference of the heat sink 5. A gear 12 meshes with the outer side of the external gear ring 11. The axis of the gear 12 is perpendicular to the ground. An external motor 13 is keyed to the central shaft of the gear 12. The motor 13 is electrically connected to the controller built into the control panel. The motor 13 can drive the entire gear 12 to rotate, thereby driving the entire heat sink 5 to rotate along the central shaft through the meshing external gear ring 11.

[0026] The heat sink 5 has a sandwich structure. Several layers of axial flow blades 6 are spaced apart along the height of the sandwich layer from top to bottom. Each layer of axial flow blades 6 is spaced apart along the circumferential inner wall of the heat sink 5. Several heat dissipation holes 51 are distributed circumferentially on the inner wall of the heat sink 5 that are in contact with the vacuum cavity 4. The heat dissipation holes 51 penetrate the inner wall of the heat sink 5, allowing the airflow drawn into the sandwich layer of the heat sink 5 to contact the outer wall of the vacuum cavity 4, uniformly carrying away the heat from the outer shell of the vacuum cavity 4. Four coil modules 7 are spaced circumferentially on the outer wall of the heat sink 5, with each coil module 7 spaced 90 degrees apart. In this embodiment, two opposing coil modules 7 form a group. In this embodiment, the directions of the two sets of magnetic fields face the entire diameter, and the directions of the two sets of magnetic fields intersect at 90 degrees. Each coil module 7 is arranged parallel to the central axis of the heat sink 5. The coil module 7 includes a cylindrical shell with an arc-shaped outer wall. A vertical through slot 8 is opened inside the cylindrical shell. Several sets of metal coils 9 are arranged at height intervals on the relative inner walls of the through slot 8. The metal coils 9 are cylindrical windings and their axial direction is parallel to the ground.

[0027] One end of the metal coil 9 near the outer wall of the cylindrical shell is connected to the outer wall of the cylindrical shell. Several metal contacts are provided on the outer wall of the cylindrical shell at intervals corresponding to the ends of each coil. The metal coil 9 and the metal contacts are electrically connected by wires.

[0028] An arc-shaped guide rail 10 is provided on the outside of the cylindrical shell. The arc-shaped guide rails 10 are spaced apart along the circumference of the vacuum cavity 4. In this embodiment, there are two arc-shaped guide rails 10. The two arc-shaped guide rails 10 are arranged opposite each other along the circumference. The arc-shaped guide rails 10 are not completely circular. The side of the arc-shaped guide rail 10 near the cylindrical shell is covered with a metal conductive layer. In this embodiment, the length of the arc-shaped guide rail 10 is less than 1 / 4 of the circumference of the circle in which the arc-shaped guide rail 10 is located. The four arc-shaped guide rails 10 provided in this embodiment are arranged in a group with opposite arc-shaped guide rails 10. A group of arc-shaped guide rails 10 is symmetrically arranged along the diameter of its circle.

[0029] The specific implementation process is as follows:

[0030] When the vacuum circuit breaker closes and opens, the controller sends a control signal to the motor 13, and the output shaft of the motor 13 starts to rotate. The gear 12 on the output shaft rotates synchronously, and through the meshing gear 12, it drives the heat sink 5 to rotate. When the heat sink 5 rotates, the axial flow blades 6 inside it draw the external airflow into the interlayer. The airflow enters from the bottom of the heat sink 5 and blows out from the top, thereby evenly dissipating the heat on the outer peripheral wall of the vacuum circuit breaker. At the same time, during a single rotation of the heat sink 5, since the single arc-shaped guide rail 10 is only one-quarter of the total circumference, during the rotation of the heat sink 5, only one set of coil windings in the two sets of opposite coil windings will contact the arc-shaped guide rail 10. After the metal conductive layer on the arc-shaped guide rail 10 comes into contact with the metal contact, direct current flows through the coil. One set of coil windings forms a magnetic field line with the same direction. The direction of the magnetic field is perpendicular to the circumferential side wall of the heat sink 5. Figure 3 As shown, at 1 / 4 turn, the coil winding in the aa direction connects to the arc-shaped guide rail and generates a magnetic field, while the coil winding in the bb direction does not generate a magnetic field. At 2 / 4 turn, the coil winding in the bb direction generates a magnetic field, and the direction of the magnetic field is opposite to the previous direction. At 3 / 4 turn, the coil winding in the aa direction touches the arc-shaped guide rail 10 again, and a magnetic field is continuously generated during the process of touching the arc-shaped guide rail. At 4 / 4 turn, the coil winding in the bb direction touches the arc-shaped guide rail 10 again, and the direction of the magnetic field at this time is opposite to the direction of the magnetic field at 2 / 4 turn.

[0031] Therefore, during a single rotation, the magnetic field changes direction multiple times, and this change in the magnetic field also causes a change in the electric field. When the strength or direction of the magnetic field changes, an induced electric field is generated around the conductor. This induced electric field interacts with the original electric field, causing a redistribution of the electric field, which in turn affects the positional distribution of the arc between the two contacts.

[0032] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A side-mounted vacuum circuit breaker ring main unit, characterized in that: The device includes a cabinet containing a side-mounted vacuum circuit breaker. The vacuum chamber of the circuit breaker has a rotatable heat sink that rotates along the vacuum chamber. The heat sink has a channel for airflow. Several coil modules are arranged circumferentially on the outer wall of the heat sink. Each coil module contains several horizontally spaced axial metal coils. Several charged arc-shaped guide rails, not perfectly circular, are arranged at intervals outside the coil modules. The coil modules, positioned opposite each other, contact the arc-shaped guide rails, energizing the metal coils and creating a magnetic field within them. Because the coil modules are spaced apart along the circumference of the heat sink, magnetic fields in different directions are formed. When the heat sink rotates one revolution, the coil modules sequentially contact the arc-shaped guide rails at 1 / 4 cycle intervals, conducting direct current and generating mutually orthogonal magnetic fields perpendicular to the sidewalls of the heat sink and in opposite directions.

2. The side-mounted vacuum circuit breaker ring main unit according to claim 1, characterized in that: The heat sink has several layers of axial flow blades spaced at intervals along its height in the through groove, and each layer of axial flow blades is spaced at intervals along the circumference of the heat sink.

3. The side-mounted vacuum circuit breaker ring main unit according to claim 2, characterized in that: An external gear ring is provided on the bottom side wall of the heat sink along the circumference. A gear meshes on the outer circumference of the external gear ring. The gear key is connected to the output shaft of the motor of the external device. The motor is electrically connected to the controller of the external device.

4. The side-mounted vacuum circuit breaker ring main unit according to claim 3, characterized in that: The coil module includes a cylindrical housing, the outer wall of which is an arc shape that conforms to the curvature of the arc-shaped guide rail.

5. The side-mounted vacuum circuit breaker ring main unit according to claim 4, characterized in that: A horizontal partition is provided in the middle of the cabinet, and the side-mounted vacuum circuit breaker is installed on the upper surface of the partition.

6. The side-mounted vacuum circuit breaker ring main unit according to claim 5, characterized in that: The number of coil modules is 4 sets, and the number of arc-shaped guide rails is 2. The arc-shaped guide rails are arranged circumferentially at intervals on the outside of the heat sink.

7. The side-mounted vacuum circuit breaker ring main unit according to claim 6, characterized in that: The coil module contains several sets of axially horizontal metal coils spaced from top to bottom.

8. The side-mounted vacuum circuit breaker ring main unit according to claim 7, characterized in that: The heat sink has several heat dissipation holes that penetrate the inner wall of the vacuum chamber and are distributed at intervals along the circumferential sidewall of the heat sink.

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