An open-close closure device for low voltage DC service

Abstract

The application relates to the field of low-voltage electrical components, and discloses an opening and closing type sealing device for a low-voltage direct-current working condition. An opening and closing plate is located between an upper chamber and a lower chamber. When a driving contact is opened, an arc is generated between a static arc contact and a dynamic arc contact, and both sides of a hinge are closed. A gas-solid or conductive particle mixture generated by arc burning in the upper chamber is isolated in the area, the influence on the dielectric performance in the lower chamber is reduced, the possibility of electric breakdown between the main static contact and the driving contact is effectively reduced, the protection blank of the main contact reclosing caused by the rebound of arc byproducts is filled, and the isolation function is realized only as an accessory, without replacing the core components of the circuit breaker and without modifying the operating mechanism. The production and transformation of the existing low-voltage direct-current circuit breaker are adapted, the byproducts are blocked from entering the main contact area through linkage physical isolation, and the protection of the dielectric performance of the main contact is more direct and efficient than the indirect way of conventional arc extinguishing and electric field optimization.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical components and equipment, specifically to an openable and closed device for low-voltage DC operating conditions. Background Technology

[0002] DC universal circuit breakers face unfavorable conditions during use, such as high rated voltage and long arc burning time.

[0003] Typically, DC circuit breakers are designed with main arc contacts, where the arc contacts are responsible for igniting the arc to the arc-extinguishing chamber, and the main contacts are responsible for carrying the rated current.

[0004] For example, Chinese patent CN202134477U discloses an arc-extinguishing chamber used in circuit breakers. This arc-extinguishing chamber includes: an inner cavity, which is a sealed space; a stationary contact, one end of which is connected to an external circuit, and the other end which can be sequentially inserted into a secondary arc-extinguishing chamber and a primary arc-extinguishing chamber; a pull rod, which can move vertically; and an arc contact located at the top of the pull rod, situated within the primary arc-extinguishing chamber, which can tightly adhere to the stationary contact using its own elasticity. This solution only addresses the arc diffusion problem, without considering the hazards of gaseous, solid, or conductive particulate byproducts during arc extinguishing, and has a high overall cost, relying on arc-extinguishing gases such as sulfur hexafluoride.

[0005] For example, Chinese Patent CN104465256A discloses an arc-extinguishing chamber for an isolating circuit breaker and an isolating circuit breaker using the arc-extinguishing chamber. The isolating circuit breaker includes an arc-extinguishing chamber, in which stationary main contacts, moving main contacts, stationary arc contacts, and moving arc contacts are arranged correspondingly in the vertical direction. When the isolating circuit breaker is open, the stationary main contacts and stationary arc contacts are located above the corresponding moving main contacts and moving arc contacts. The stationary arc contacts and moving arc contacts are located inside the stationary main contacts and moving main contacts. A shielding cover is provided between the stationary arc contacts and stationary main contacts to shield the stationary arc contacts when the circuit breaker is open. The shielding cover has a lower shielding end located below the stationary arc contacts when the circuit breaker is open. This solution addresses the electric field distortion caused by static arc contact erosion or protrusion in isolating circuit breakers, focusing on improving the insulation performance of the break point after tripping. It addresses the electric field distortion and dual-function integrated design of high-voltage AC isolating circuit breakers, but it cannot solve the byproduct rebound problem of low-voltage DC circuit breakers.

[0006] During short-circuit breaking tests, when traditional DC arc-extinguishing chambers use grid-plate arc extinguishing, the pressure maintenance or narrow channel design requirements inside the chamber mean that the gas-solid mixture or conductive particle mixture generated when the arc from the arc contact enters the chamber and burns surrounding objects cannot escape from the top of the chamber to the outside of the circuit breaker in time. Instead, it bounces back between the active and stationary contacts, causing the main contacts to break down and re-arc. This phenomenon can result in anything from high arc-extinguishing chamber temperature and prolonged arcing time to short-circuit breaking failure and circuit breaker burnout. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides an openable / closing enclosure for low-voltage DC operating conditions, thereby solving the aforementioned problems.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions.

[0009] A retractable enclosure for low-voltage DC operation includes an upper chamber, a lower chamber, and a retractable enclosure plate. The upper chamber includes a stationary arc contact and a moving arc contact, and the lower chamber includes a main stationary contact and a moving contact. The moving arc contact is provided with a moving arc contact finger on the opposite side. The stationary arc contact and the moving arc contact are arranged opposite each other. The main stationary contact and the driving contact are also arranged opposite each other. The opening and closing plate is located between the upper and lower chambers. The plate includes a main board, hinges, and an elastic element. The hinges are movably mounted on the main board via the elastic element, with the center of the hinge abutting against the moving arc contact finger. When the active contact opens, an electric arc is generated between the stationary and moving arc contacts, causing the hinges to close. The gas-solid mixture or conductive particle mixture generated by the arc in the upper chamber is isolated in this area, reducing the impact on the lower chamber. The indoor dielectric properties effectively reduce the possibility of re-electrical breakdown between the main stationary contact and the active contact, filling the protection gap caused by the rebound of arc byproducts leading to re-breakdown of the main contact. It is a dedicated optimization for low-voltage DC operating conditions, and only serves as an accessory to achieve the isolation function. There is no need to replace the core components of the circuit breaker or modify the operating mechanism. It is compatible with the production and retrofitting of existing low-voltage DC circuit breakers. By linking physical isolation, it blocks byproducts from entering the main contact area at the source. The protection of the dielectric properties of the main contact is more direct and efficient than the indirect methods of conventional arc extinguishing and electric field optimization.

[0010] Preferably, the motherboard is provided with a limiting post and a rotating shaft.

[0011] Preferably, the hinge is provided with a limiting groove and a rotating hole, the limiting groove is engaged with a limiting post, and the rotating hole is connected to a rotating shaft.

[0012] Preferably, the elastic element is a tension spring. Compared to existing technologies, this invention discloses an openable and closing sealing device for low-voltage DC operating conditions, comprising an upper chamber, a lower chamber, and an openable and closing sealing plate. These three components work together to function. The openable and closing sealing plate is located between the upper and lower chambers. When the active contact opens, an electric arc is generated between the stationary and active arc contacts. The hinges on both sides close, isolating the gas-solid mixture or conductive particle mixture generated by the arc in the upper chamber. This reduces the impact on the dielectric properties of the lower chamber, effectively reducing the possibility of re-electrical breakdown between the main stationary and active contacts. It fills the protection gap against re-breakdown of the main contacts caused by the rebound of arc byproducts. This invention is a dedicated optimization for low-voltage DC operating conditions, providing isolation functionality as an accessory without replacing core circuit breaker components or modifying the operating mechanism. It is compatible with the production and retrofitting of existing low-voltage DC circuit breakers. Through physical isolation, it prevents byproducts from entering the main contact area at the source, providing more direct and efficient protection of the main contact's dielectric properties than conventional indirect methods of arc extinguishing and electric field optimization. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the opening and closing type of closed device for low-voltage DC operating conditions according to the present invention. Figure 2 This is a cross-sectional schematic diagram of the opening and closing type closed device of the present invention for low-voltage DC operating conditions; Figure 3 This is a schematic diagram of the opening and closing type of closed device for low-voltage DC operating conditions according to the present invention. Figure 4 This is a schematic diagram of the structural closure of the opening and closing plate component of the present invention; Figure 5 This is a schematic diagram of the structure of the opening and closing plate of the present invention when it is open; Figure 6 This is a schematic diagram of the structure of the motherboard of the present invention; Figure 7 This is a schematic diagram of the hinge structure of the present invention; Figure 8 This is a schematic diagram of the structure of a sealing device in the prior art. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0015] A retractable sealing device for low-voltage DC operation includes an upper chamber 1, a lower chamber 2, and a retractable sealing plate 3. The upper chamber 1 includes a stationary arc contact 11 and a moving arc contact 12. The lower chamber 2 includes a main stationary contact 21 and a driving contact 22. A moving arc contact finger 121 is provided on the opposite side of the moving arc contact 12. The stationary arc contact 11 and the moving arc contact 12 are arranged opposite to each other. The main stationary contact 21 and the driving contact 22 are... The opening and closing plate 3 is positioned between the upper chamber 1 and the lower chamber 2. The opening and closing plate includes a main plate 31, a hinge 32, and an elastic element 33. The hinge 32 is openably mounted on the main plate 31 via the elastic element 33, and its center abuts against the moving arc contact finger 121. The main plate 31 has a limiting post 311 and a rotating shaft 312. The moving arc contact finger 121 normally moves left and right on the main plate 31 to close or open the circuit. The hinge 32 has a limiting groove 321 and a rotating hole 322. The limiting groove 321 is engaged with the limiting post 311, and the rotating hole 322 is connected to the rotating shaft 312. The elastic element 33 is a tension spring.

[0016] The opening and closing plate 3 is located between the upper chamber 1 and the lower chamber 2, effectively isolating the two.

[0017] During the opening of the active contact 22, an electric arc is generated between the stationary arc contact 11 and the moving arc contact 12. When the active contact 22 is in the open position after opening, it is divided into an upper chamber 1 and a lower chamber 2. The moving arc contact finger 121 abuts against the hinge 32. Under the thrust of the moving arc contact finger 121, the hinge 32 moves along the groove trajectory on the limiting post 311, and the two hinges 32 close. The gas-solid mixture or conductive particle mixture generated by the electric arc in the upper chamber 1 is isolated in this area, which reduces the impact on the dielectric properties in the lower chamber 2 and effectively reduces the possibility of re-electrical breakdown between the main stationary contact 21 and the active contact 22. When closing, the moving arc contact finger 121 moves to the opposite side and no longer presses the protruding part in the middle of the hinge 32. The two hinges 32 open under the action of the elastic element 33. It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0018] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0019] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A switchable enclosure for low-voltage DC operation, characterized in that: It includes an upper chamber (1), a lower chamber (2), and an opening and closing plate (3). The upper chamber (1) includes a stationary arc contact (11) and a moving arc contact (12). The lower chamber (2) includes a main stationary contact (21) and a moving contact (22). The moving arc contact (12) has a moving arc contact finger (121) on the opposite side. The stationary arc contact (11) and the moving arc contact (12) are arranged opposite to each other. The main stationary contact (21) and the active contact (22) are also arranged opposite to each other. The opening and closing plate (3) is located between the upper chamber (1) and the lower chamber (2). The opening and closing plate includes a main plate (31), a hinge (32), and an elastic element (33). The hinge (32) is openable and closable on the main plate (31) through the elastic element (33), and the middle part of the hinge (32) abuts against the moving arc contact finger (121).

2. The openable / closing enclosure for low-voltage DC operation as described in claim 1, characterized in that: The main board (31) is provided with a limiting post (311) and a rotating shaft (312).

3. The openable / closing enclosure for low-voltage DC operation as described in claim 2, characterized in that: The hinge (32) is provided with a limiting groove (321) and a rotating hole (322). The limiting groove (321) is engaged with the limiting post (311), and the rotating hole (322) is connected to the rotating shaft (312).

4. The openable / closing enclosure for low-voltage DC operation according to claim 1, characterized in that: The elastic element (33) is a tension spring.

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