A mine high-voltage vacuum circuit breaker

Abstract

The utility model belongs to high -voltage electrical equipment technical field discloses a kind of mining high-voltage vacuum circuit breaker, including circuit breaker shell, operating mechanism and insulating support piece, and circuit breaker shell is set using sealing structure;Multiple vacuum interrupters are installed on circuit breaker shell, and vacuum interrupter is inclined V-shaped symmetrical arrangement structure, and the static end of each vacuum interrupter is equipped with permanent magnet ring, and the axis between every two of three-phase interrupter is 10 °-30 ° included angle, from the overhead direction, it is V-shaped layout, the flange integrally formed on the inner cavity wall of circuit breaker shell, double-layer port-shaped silica gel sealing pad is installed between the cover joint surface of circuit breaker shell and flange.The utility model is through inclined V-shaped layout, permanent magnet ring magnetic field control and arc rotating mechanism, solve the problem of insufficient breaking capacity of traditional arc-extinguishing chamber in narrow space, while the influence of metal deposition on insulation can be reduced, efficient arc extinguishing and compact structure balance are realized.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage electrical equipment technology, and in particular to a high-voltage vacuum circuit breaker for mining. Background Technology

[0002] High-voltage vacuum circuit breakers are the core protection components of mine power supply systems. Their reliability is directly related to the safety of underground operations. The mine environment is characterized by narrow space, high humidity, dust, flammable and explosive gases, and strong vibrations during equipment operation, which places extremely high demands on the performance of circuit breakers.

[0003] Existing mining vacuum circuit breakers suffer from a contradiction between arc-extinguishing performance and space constraints. Specifically, traditional arc-extinguishing chambers are mostly arranged horizontally or vertically, and metal vapors and particulate matter generated during the arc-extinguishing process are prone to deposit in the arc-extinguishing chamber, reducing insulation strength. Furthermore, in the confined space of mining switchgear, arc magnetic field control is poor, affecting breaking capacity. Therefore, we propose a mining high-voltage vacuum circuit breaker. Utility Model Content

[0004] In view of the contradiction between the arc extinguishing performance and space limitations of existing high-voltage vacuum circuit breakers for mining, this utility model is proposed.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A high-voltage vacuum circuit breaker for mining includes a circuit breaker housing, an operating mechanism, and an insulating support component, wherein the circuit breaker housing is configured with a sealed structure.

[0007] The circuit breaker housing is equipped with multiple vacuum interrupters. The vacuum interrupters are arranged in an inclined V-shape symmetrical structure, and each vacuum interrupter is provided with a permanent magnet ring that generates a longitudinal magnetic field at its stationary end. The inclined V-shape symmetrical arrangement means that the axes of the three-phase interrupters are at an angle of 10°-30° between each other, and the arrangement is V-shaped when viewed from above.

[0008] As a technical solution of the mining high-voltage vacuum circuit breaker described in this utility model, the inner wall of the circuit breaker housing has an integrally formed flange, and a double-layer shaped silicone sealing gasket is installed between the box cover mating surface of the circuit breaker housing and the flange.

[0009] As a technical solution of the mining high-voltage vacuum circuit breaker of this utility model, a physical adsorption desiccant box is installed inside the circuit breaker housing, and the physical adsorption desiccant box is in contact with the shell wall of the circuit breaker housing through a heat-conducting plate fixedly installed on the circuit breaker housing.

[0010] As a technical solution of the mining high-voltage vacuum circuit breaker of this utility model, the longitudinal magnetic field generated by the permanent magnet ring forms a certain angle with the axis of the vacuum interrupter, and the permanent magnet ring is used to drive the arc to rotate along the tangential direction of the inner wall of the vacuum interrupter.

[0011] As a technical solution of the mining high-voltage vacuum circuit breaker of this utility model, the surface of the insulating support is coated with a moisture-proof insulating coating, and the structure of the insulating support is a multi-umbrella skirt form to increase the creepage distance.

[0012] Compared with the prior art, the present invention has at least the following beneficial effects:

[0013] 1. This utility model solves the problem of insufficient breaking capacity of traditional arc-extinguishing chambers in a narrow space by using an inclined V-shaped layout, permanent magnet ring magnetic field control, and arc rotation mechanism. At the same time, it can reduce the impact of metal deposition on insulation and achieve a balance between efficient arc extinguishing and compact structure.

[0014] 2. This utility model, through the comprehensive application of a sealed circuit breaker housing, a dynamic drying mechanism, and a moisture-proof insulation design, can effectively cope with the harsh working conditions of high humidity, dust, and vibration in mines, significantly reduce equipment failure rate, and extend equipment service life. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0016] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0017] Figure 2 This is a side view of the structure of this utility model.

[0018] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0019] Figure 4 For the present utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0020] Explanation of reference numerals in the attached figures:

[0021] In the diagram: 1. Circuit breaker housing; 101. Flange; 2. Vacuum interrupter; 201. Permanent magnet ring; 3. Double-layered silicone sealant; 4. Heat-conducting sheet; 5. Physical adsorption desiccant box. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0024] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0025] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0026] Reference Figures 1-4 A high-voltage vacuum circuit breaker for mining is provided. This high-voltage vacuum circuit breaker for mining includes a circuit breaker housing 1, an operating mechanism, and an insulating support. The operating mechanism and the insulating support are existing technologies and will not be described in detail here, nor are they shown in the figure. The circuit breaker housing 1 adopts a sealed structure and is fixed by welding or high-strength bolts. The sealed structure of the circuit breaker housing 1 can effectively isolate dust and moisture in the mining environment and improve the insulation strength and long-term stability of the equipment.

[0027] Multiple vacuum interrupters 2 are installed on the circuit breaker housing 1. The vacuum interrupters 2 have an inclined V-shaped symmetrical arrangement structure, and each vacuum interrupter 2 has a permanent magnet ring 201 that generates a longitudinal magnetic field at its stationary end. The inclined V-shaped symmetrical arrangement structure is such that the axes of the three-phase interrupters are at an angle of 10°-30° (e.g., 20°) between each other, forming a V-shaped layout when viewed from above. In application, the inclined V-shaped symmetrical arrangement of the vacuum interrupters 2 (axis angle of 10°-30°) optimizes space utilization, adapts to the narrow space of mine switchgear, and reduces the deposition of metal vapor and particulate matter in the interrupter, reducing the risk of insulation performance degradation. At the same time, in conjunction with the permanent magnet ring 201 (longitudinal magnetic field at the stationary end), it drives the arc to rotate through the magnetic field, accelerating arc cooling and diffusion to improve breaking capacity.

[0028] Reference Figure 3 and Figure 4 The inner wall of the circuit breaker housing 1 has an integrally formed flange 101. A double-layer orifice-shaped silicone sealing gasket 3 is installed between the box cover mating surface of the circuit breaker housing 1 and the flange 101. In application, the double-layer orifice-shaped silicone sealing gasket 3 combined with the flange 101 structure enhances the sealing performance of the circuit breaker housing 1, which is especially suitable for high humidity and high vibration conditions in mines, and prevents the seal from aging and failing.

[0029] Reference Figure 3 and Figure 4 The circuit breaker housing 1 is equipped with a physical adsorption desiccant box 5. The physical adsorption desiccant box 5 is connected to the shell wall of the circuit breaker housing 1 through a heat-conducting plate 4 fixedly installed on the circuit breaker housing 1. The physical adsorption desiccant box 5 is in contact with the shell through the heat-conducting plate 4. The heat-conducting plate 4 is coated with thermal grease to enhance heat conduction. The desiccant box is replaced every 6 months to ensure that the humidity inside the shell is below 30% RH. In application, the physical adsorption desiccant box 5 is in contact with the shell wall of the circuit breaker housing 1 through the heat-conducting plate 4. It can adsorb residual moisture inside and activate the desiccant by the heat generated during equipment operation, so as to achieve dynamic moisture prevention and avoid insulation failure caused by condensation.

[0030] Reference Figure 3 and Figure 4 The longitudinal magnetic field generated by the permanent magnet ring 201 forms a certain angle with the axis of the vacuum interrupter 2, and the permanent magnet ring 201 is used to drive the arc to rotate along the tangential direction of the inner wall of the vacuum interrupter 2. The magnetic field direction of the permanent magnet ring 201 forms an angle of 15°-25° with the axis of the vacuum interrupter 2. By driving the arc to rotate along the tangential direction of the inner wall through the magnetic field, the arc diffusion is accelerated. In application, the permanent magnet ring forms a specific angle with the axis of the interrupter, so that the arc rotates along the tangential direction, avoiding the arc from concentrating and burning the contacts, extending the life of the interrupter, and improving the stability of the breaking process.

[0031] Reference Figures 1-4The surface of the insulating support is coated with a moisture-proof insulating coating, and the structure of the insulating support is a multi-skirt type that increases the creepage distance. The surface of the insulating support is sprayed with a polytetrafluoroethylene moisture-proof coating, and the skirt structure is designed with 5-8 layers with a layer spacing of ≥15mm. The creepage distance is increased to 1.5 times the standard value. In application, the moisture-proof insulating coating and the multi-skirt structure design doubly increase the surface creepage distance of the insulating support, significantly improving the withstand voltage performance in humid and dirty environments, thereby reducing the risk of leakage.

[0032] The working principle of this utility model is as follows: Installation and commissioning stage: First, the high-voltage vacuum circuit breaker is vertically installed in the mine switch cabinet, and a heat dissipation space is reserved for the V-shaped vacuum interrupter 2 (e.g., ≥50mm on both sides). Then, after installation, 0.05MPa compressed air is introduced and the pressure is maintained for a period of time (e.g., 30 minutes) without leakage (pressure drop ≤5%).

[0033] Operation phase: Drive the moving contact and stationary contact to close through the operating mechanism, observe the opening and closing indicator to the "ON" position, and ensure that the magnetic field of the permanent magnet ring 201 is stable (magnetic field strength ≥50mT). When opening, the arc rotates and spreads under the drive of the magnetic field of the permanent magnet ring 201. With the help of the V-shaped layout, the metal vapor is cooled faster and the arc extinguishing time is ≤15ms. During this period, if the opening is abnormal (such as the arc stops), it is necessary to check the angle deviation of the permanent magnet ring 201 (allowed ±3°) and the activity of the desiccant in the physical adsorption desiccant box 5 (moisture absorption rate <60%).

[0034] Maintenance phase: Check the elasticity of the double-layer orifice silicone gasket 3 every quarter (replace if compression is less than 10%), clean the dust on the outer wall of the vacuum interrupter 2 every year, and test the surface resistance of the insulation coating (≥10-12Ω).

[0035] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A high-voltage vacuum circuit breaker for mining, comprising a circuit breaker housing (1), an operating mechanism, and an insulating support, characterized in that: The circuit breaker housing (1) is provided with a sealed structure; The circuit breaker housing (1) is equipped with multiple vacuum interrupters (2). The vacuum interrupters (2) are arranged in an inclined V-shape symmetrical structure. Each vacuum interrupter (2) has a permanent magnet ring (201) at its stationary end that generates a longitudinal magnetic field. The inclined V-shape symmetrical arrangement means that the axes of the three-phase interrupters are at an angle of 10°-30° between each other, and the arrangement is V-shaped when viewed from above.

2. The high-voltage vacuum circuit breaker for mining as described in claim 1, characterized in that: The inner wall of the circuit breaker housing (1) has an integrally formed flange (101), and a double-layer shaped silicone gasket (3) is installed between the box cover mating surface of the circuit breaker housing (1) and the flange (101).

3. The high-voltage vacuum circuit breaker for mining as described in claim 1, characterized in that: The circuit breaker housing (1) is equipped with a physical adsorption desiccant box (5), and the physical adsorption desiccant box (5) is connected to the shell wall of the circuit breaker housing (1) through a heat-conducting plate (4) fixedly installed on the circuit breaker housing (1).

4. The high-voltage vacuum circuit breaker for mining as described in claim 1, characterized in that: The longitudinal magnetic field generated by the permanent magnet ring (201) is at a certain angle to the axis of the vacuum interrupter (2), and the permanent magnet ring (201) is used to drive the electric arc to rotate along the tangential direction of the inner wall of the vacuum interrupter (2).

5. The high-voltage vacuum circuit breaker for mining according to claim 1, characterized in that: The surface of the insulating support is coated with a moisture-proof insulating coating, and the structure of the insulating support is a multi-skirt type that increases the creepage distance.

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