Explosion-proof switch solid-sealed polar pole

Abstract

The utility model discloses an explosion-proof type switch solid-sealed polar pole, which comprises an epoxy resin insulation main body, a vacuum arc-extinguishing chamber, a bolt, a butterfly-shaped gasket, a conductor and an installation nut, and the vacuum arc-extinguishing chamber is fixedly installed inside the epoxy resin insulation main body through the butterfly-shaped gasket and the bolt. The inlet end and the outlet end of the high-voltage loop are located on the upper side and the lower side of the solid-sealed polar pole. And 2, the whole height of the solid-sealed polar pole is reduced, so that the miniaturization of the switch is realized. The miniaturized vacuum arc-extinguishing chamber meets the requirement of creepage distance and is not influenced by external environmental conditions through the coated epoxy resin layer. Miniaturization of the product and simplification of parts are achieved, and the product is light in weight and convenient to install.

Description

Technical Field

[0001] The utility model relates to the technical field of solid-sealed poles, in particular to a solid-sealed pole of an explosion-proof switch. Background Art

[0002] In the medium voltage distribution network, SF6 insulating medium is widely used in the ring network switchgear. As one of the six greenhouse gases, SF6 gas has attracted wide attention from all walks of life. my country has made energy conservation and emission reduction a national policy for sustainable development.

[0003] The ring main unit that uses environmentally friendly gas as the external insulation method is developed to replace SF6 insulated switchgear equipment to meet the requirements of adapting to harsh environmental conditions. Its structural features: the entire conduction and disconnection circuit of the switch is sealed in epoxy resin insulation material to meet the requirements of external insulation of miniaturized vacuum interrupters; the entire conductive circuit generally includes an incoming bushing, an incoming conductor isolation knife switch, an isolation contact seat, a static end of the arc extinguishing chamber, a flexible connection of the dynamic end, an outgoing conductor, and an outgoing bushing. The isolation circuit is close to the static end of the arc extinguishing chamber for the upper isolation scheme, and the isolation circuit is close to the dynamic end of the arc extinguishing chamber for the lower isolation scheme. The entire conductive circuit is sealed in a closed box, and its insulation to the ground and between phases is not affected by external conditions, such as plateau areas, dirty and humid areas, etc., achieving good environmental resistance. The structure, strength, and incoming and outgoing lines of the switch meet the requirements of explosion-proof. A miniaturized vacuum interrupter is used to reduce the height and diameter of the entire product, thereby realizing the miniaturization of the switch.

[0004] The main drawbacks of the traditional solution:

[0005] 1. SF6 is one of the gases that is explicitly banned by the Kyoto Protocol, and it has a significant greenhouse effect;

[0006] 2. Using SF6 as the external insulating medium, due to its high dielectric strength, the distance between the high voltage and the ground can be designed to be small. If the box leaks (strictly speaking, it is not completely sealed, but the leakage rate is different), it is easy to cause phase-to-phase and ground breakdown;

[0007] 3. The conductive circuit connection requirements in the box are high (SF6 interface effect is obvious);

[0008] 4. The box is filled with SF6 at a certain pressure, which places high demands on the quality of the box itself (using stainless steel, precision welding, and pressure resistance). Utility Model Content

[0009] In order to overcome the deficiencies of the prior art, one of the purposes of the utility model is to provide an explosion-proof switch sealed pole.

[0010] One of the purposes of the utility model is achieved by the following technical solution:

[0011] The explosion-proof switch sealed pole comprises an epoxy resin insulation body, a vacuum interrupter, bolts, butterfly washers, conductors and mounting nuts. The vacuum interrupter is fixedly installed inside the epoxy resin insulation body through the butterfly washers and bolts, and the conductor is fixedly connected to the bottom of the epoxy resin insulation body through the mounting nuts.

[0012] Furthermore, the number of the mounting nuts is four, and the four mounting nuts are arranged in a rectangular array.

[0013] Furthermore, the epoxy resin insulation body is made by an automatic pressure gel molding process.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The inlet and outlet ends of the high-voltage circuit are located on the upper and lower sides of the sealed pole. First, it is convenient for the connection of the high-voltage circuit; second, it reduces the height of the sealed pole (the insulation to the ground is guaranteed by the horizontal distance), thereby realizing the miniaturization of the switch. The miniaturized vacuum interrupter meets the requirements of creepage distance and is not affected by external environmental conditions through the epoxy resin layer. The miniaturization of the product and the simplification of components are achieved, and the product is light and easy to install.

[0016] 2. The conductive circuit includes the incoming bushing, isolating switch (later installed), incoming conductor, vacuum arc extinguishing chamber, flexible connection (later installed), outgoing bushing, etc., which constitute a complete switch opening and closing circuit. The incoming bushing and outgoing bushing are respectively connected to the upper-level substation and the user end.

[0017] 3. The installation and fixation of the sealed pole insulation cylinder consists of 4 nuts, which are fixed to the installation surface of the switch cabinet with bolts. Due to the use of epoxy resin automatic pressure gel molding process (APG), the overall mechanical properties are significantly improved. The dimensional accuracy of the product is improved by accurate size control of the mold, which is beneficial to improve the matching of the conductive circuit, reduce contact resistance and improve interchangeability. In the whole solution, the switch cabinet has a small depth (miniaturized switch), good interchangeability, easy installation and high reliability.

[0018] 4. During production, the connection torque between the incoming conductor and the vacuum interrupter is controlled. The vacuum interrupter is perpendicular to the installation surface as a whole, ensuring low contact resistance of the conductive circuit, reducing thermal aging of the insulator, and greatly improving the service life of the product.

[0019] 5. The rated voltage of this sealed pole is 12kV, and the current value is 630A / 1250A. Two schemes can meet the needs of ring network power supply in cities, factories, etc.

[0020] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional diagram of this embodiment;

[0022] Figure 2 This is a schematic diagram of the main structure of this embodiment;

[0023] Figure 3 It is a right view structural schematic diagram of this embodiment;

[0024] Figure 4 It is a bottom view of this embodiment;

[0025] Figure 5 It is a top view of this embodiment.

[0026] In the figure: 1. Epoxy resin insulation body; 2. Vacuum interrupter; 3. Bolt; 4. Butterfly gasket; 5. Conductor; 6. Mounting nut. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0028] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] See also Figures 1 to 5, the explosion-proof switch sealed pole includes an epoxy resin insulation body 1, a vacuum interrupter 2, a bolt 3, a butterfly gasket 4, a conductor 5 and a mounting nut 6. The vacuum interrupter 2 is fixedly installed inside the epoxy resin insulation body 1 through the butterfly gasket 4 and the bolt 3. The epoxy resin insulation body 1 is made by an automatic pressure gel molding process, and the overall mechanical properties are significantly improved. The dimensional accuracy of the product is improved by accurate dimensional control of the mold, which is beneficial to improve the matching of the conductive circuit, reduce contact resistance, and improve interchangeability. The conductor 5 is fixedly connected to the bottom of the epoxy resin insulation body 1 through the mounting nut 6. The mounting nuts 6 are set in four, and the four mounting nuts 6 are arranged in a rectangular array.

[0031] Working principle: When the utility model is in use, the conductor 5, the vacuum interrupter 2 and other components constitute the entire closing and opening circuit of the switch, and the epoxy resin insulating body 1 provides fixed support, ground insulation and surface insulation for the conductive circuit, thereby realizing the miniaturization of the switch.

[0032] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. An explosion-proof switch sealed pole, comprising an epoxy resin insulating body (1), a vacuum interrupter (2), a bolt (3), a butterfly gasket (4), a conductor (5) and a mounting nut (6), characterized in that: The vacuum interrupter (2) is fixedly mounted inside the epoxy resin insulation body (1) via a butterfly gasket (4) and bolts (3), and the conductor (5) is fixedly connected to the bottom of the epoxy resin insulation body (1) via a mounting nut (6).

2. The explosion-proof switch sealed pole according to claim 1, characterized in that: The mounting nuts (6) are arranged in four numbers, and the four mounting nuts (6) are arranged in a rectangular array.

3. The explosion-proof switch sealed pole according to claim 1, characterized in that: The epoxy resin insulating body (1) is manufactured by an automatic pressure gel molding process.

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