Environment-friendly gas insulated load switch gas tank

Abstract

The utility model provides a kind of environmental protection gas insulation load switch gas tank, including box, load switch, upper incoming and outgoing line bushing, lower incoming and outgoing line bushing, operating mechanism and shielding mechanism, by the funnel structure of the design of lower shielding cover is "up big down small", can cooperate with upper shielding cover, effectively gather and guide arc plasma and high hot air current escaping from bottom opening, this makes airflow directionality stronger, faster, significantly enhanced "gas blow" effect, can more effectively lengthen and cool arc, to accelerate arc extinguishing, gas production material layer will decompose under arc high temperature and produce a large amount of arc extinguishing gas, these arc extinguishing gas can rapidly increase the pressure inside insulating cylinder, and synergistic effect with funnel structure, realize the function of auxiliary arc extinguishing, and can be replaced by the way of disassembling lower shielding cover, realize the quick replacement of gas production material layer, prolong the service life of shielding mechanism.

Description

Technical Field

[0001] This utility model relates to the field of environmentally friendly gas-insulated load switch gas boxes, and in particular to an environmentally friendly gas-insulated load switch gas box. Background Technology

[0002] Currently, medium-voltage switchgear is widely used in power systems. Combined switchgear (such as ring main units) often employs a structure combining load switches and fuses. To meet arc extinguishing and insulation requirements, traditional equipment often uses SF6 gas as the insulating medium. However, SF6 gas is a strong greenhouse gas with significant environmental impact, which is inconsistent with the current trend of green power equipment development. Although there are solutions using vacuum arc extinguishing technology, these have drawbacks such as the possibility of non-holding destructive discharge (NSDD) at high voltages and cold welding of contacts, posing potential safety and reliability risks.

[0003] To replace SF6 gas, environmentally friendly switchgear using dry air as the insulating medium has emerged in the prior art. For example, patent CN 116417918 A proposes a combined switchgear, which sets an insulating cylinder inside the gas box to surround the stationary contact to limit the arc generated during opening and prevent the arc from spreading and causing phase-to-phase short circuits. This structure improves the breaking capacity in air environment to a certain extent and reduces equipment cost and environmental pollution. However, the bottom of the insulating cylinder in this structure is open, and the arc may still escape from the bottom during the breaking process, forming a diffuse arc or high-temperature airflow, which may interfere with the electrical components of adjacent phases. Especially when the current is large, the arc is difficult to completely suppress and extinguish quickly, which poses certain safety risks. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the aforementioned problems in the prior art, this utility model provides an environmentally friendly gas-insulated load switch gas box.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0008] An environmentally friendly gas-insulated load switch box includes a box body, a load switch, upper inlet and outlet bushings, lower inlet and outlet bushings, an operating mechanism, and a shielding mechanism.

[0009] The enclosure is an airtight enclosure;

[0010] The upper inlet / outlet sleeve and the lower inlet / outlet sleeve are disposed on the box wall of the box body;

[0011] The load switch includes an upper insulating contact, a lower insulating contact, a first conductive end, a second conductive end, and a conductive rod;

[0012] The upper insulating contact and the lower insulating contact are arranged vertically opposite to each other.

[0013] The first conductive end is mounted on the upper insulating contact.

[0014] The second conductive terminal is mounted on the lower insulating contact.

[0015] The conductive rod is installed inside the lower insulating contact and connected to the operating mechanism. The operating mechanism controls the conductive rod to move up and down, which can make or break the electrical connection between the first conductive end and the second conductive end, so as to realize the operation of closing and opening the switch.

[0016] The shielding mechanism includes an upper shield and a lower shield. The upper shield is fixedly installed on the upper insulating contact and covers the first conductive end. The lower shield is located at the bottom of the upper shield and has a funnel-shaped structure with small upper and lower parts.

[0017] Preferably, the bottom outer wall of the upper shield is provided with an external thread, and the top opening of the lower shield is provided with an internal thread corresponding to the external thread, and the lower shield is threadedly connected to the bottom of the upper shield.

[0018] Preferably, the shielding mechanism further includes a gas-generating material layer, which has a conical ring structure. The inner wall of the lower shield is provided with an installation groove corresponding to the gas-generating material layer. After the lower shield is threadedly connected to the upper shield, the gas-generating material layer is fixedly installed in the installation groove.

[0019] Preferably, the gas-generating material layer is made of polyamide or epoxy resin.

[0020] Preferably, the upper and lower shields are made of polyetheretherketone or polyetherimide.

[0021] (III) Beneficial Effects

[0022] The beneficial effects of this utility model are as follows:

[0023] 1. By designing the lower shield as a funnel structure with a larger top and a smaller bottom, it can work in conjunction with the upper shield to effectively gather and guide the arc plasma and high-temperature gas flow escaping from the bottom opening. This makes the gas flow more directional and faster, significantly enhancing the "blowing" effect, which can more effectively lengthen and cool the arc, thereby accelerating the extinction of the arc.

[0024] 2. The gas-generating material layer decomposes under the high temperature of the electric arc to produce a large amount of arc-extinguishing gas. This arc-extinguishing gas can rapidly increase the pressure inside the insulating cylinder and work in synergy with the funnel structure to achieve the function of auxiliary arc extinguishing. Furthermore, the gas-generating material layer can be quickly replaced by removing the shielding cover, thus extending the service life of the shielding mechanism. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of an environmentally friendly gas-insulated load switch gas box;

[0026] Figure 2 This is a schematic diagram of the closing and opening structure of a load switch;

[0027] Figure 3 This is a schematic diagram of the exploded structure of the shielding mechanism;

[0028] Figure 4 This is a schematic diagram of the combined structure of the shielding mechanism.

[0029] [Explanation of Labels in the Attached Image]

[0030] 1. Box body;

[0031] 2. Upper inlet and outlet bushings;

[0032] 3. Install inlet and outlet bushings;

[0033] 4. Load switch;

[0034] 41. Upper insulating contact; 42. First conductive end; 43. Lower insulating contact; 44. Second conductive end; 45. Conductive rod;

[0035] 5. Shielding mechanism;

[0036] 51. Upper shield; 52. Lower shield; 53. Gas-producing material layer. Detailed Implementation

[0037] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Please refer to Figures 1 to 4 This utility model provides an environmentally friendly gas-insulated load switch gas box, including a box body, a load switch, an upper inlet and outlet bushing, a lower inlet and outlet bushing, an operating mechanism, and a shielding mechanism;

[0039] The enclosure is an airtight enclosure;

[0040] The upper inlet / outlet sleeve and the lower inlet / outlet sleeve are disposed on the box wall of the box body;

[0041] The load switch includes an upper insulating contact, a lower insulating contact, a first conductive end, a second conductive end, and a conductive rod;

[0042] The upper insulating contact and the lower insulating contact are arranged vertically opposite to each other.

[0043] The first conductive end is mounted on the upper insulating contact.

[0044] The second conductive terminal is mounted on the lower insulating contact.

[0045] The conductive rod is installed inside the lower insulating contact and connected to the operating mechanism. The operating mechanism controls the conductive rod to move up and down, which can make or break the electrical connection between the first conductive end and the second conductive end, so as to realize the operation of closing and opening the switch.

[0046] The shielding mechanism includes an upper shield and a lower shield. The upper shield is fixedly installed on the upper insulating contact and covers the first conductive end. The lower shield is disposed at the bottom of the upper shield and has a funnel structure with small upper and lower parts.

[0047] In use, by designing the lower shield as a funnel structure with a larger top and a smaller bottom, it can work in conjunction with the upper shield to effectively gather and guide the arc plasma and high-temperature airflow escaping from the bottom opening. This makes the airflow more directional and faster, significantly enhancing the "air blowing" effect, which can more effectively lengthen and cool the arc, thereby accelerating the extinction of the arc.

[0048] In this embodiment, the bottom outer wall of the upper shield is provided with an external thread, and the top opening of the lower shield is provided with an internal thread corresponding to the external thread. The lower shield is threadedly connected to the bottom of the upper shield. The shielding mechanism also includes a gas-generating material layer, which has a conical ring structure. The inner wall of the lower shield is provided with an installation groove corresponding to the gas-generating material layer. After the lower shield is threadedly connected to the upper shield, the gas-generating material layer is fixedly installed in the installation groove.

[0049] During use, the gas-generating material layer decomposes under the high temperature of the electric arc to produce a large amount of arc-extinguishing gas. This arc-extinguishing gas can rapidly increase the pressure inside the insulating cylinder and work in synergy with the funnel structure to achieve the function of auxiliary arc extinguishing. Furthermore, the gas-generating material layer can be quickly replaced by removing the shielding cover, thus extending the service life of the shielding mechanism.

[0050] In this embodiment, the gas-generating material layer is made of polyamide or epoxy resin. Under the high temperature of the electric arc, the polyamide or epoxy resin will decompose instantly to generate a high-pressure mixed gas mainly composed of hydrogen and hydrocarbons, mixed with other gases, thereby extinguishing the arc.

[0051] In this embodiment, the upper and lower shielding covers are made of polyetheretherketone or polyetherimide. Please refer to... Figures 1 to 4 This utility model provides an environmentally friendly gas-insulated load switch 4-gas box, including a box body 1, a load switch 4, an upper inlet / outlet bushing 2, a lower inlet / outlet bushing 3, an operating mechanism, and a shielding mechanism 5;

[0052] The enclosure 1 is an airtight enclosure 1;

[0053] The upper inlet / outlet sleeve 2 and the lower inlet / outlet sleeve 3 are disposed on the wall of the housing 1;

[0054] The load switch 4 includes an upper insulating contact 41, a lower insulating contact 43, a first conductive end 42, a second conductive end 44, and a conductive rod 45.

[0055] The upper insulating contact and the lower insulating contact are arranged vertically opposite to each other.

[0056] The first conductive end 42 is mounted on the upper insulating contact seat;

[0057] The second conductive terminal 44 is mounted on the lower insulating contact.

[0058] The conductive rod 45 is installed inside the lower insulating contact seat and connected to the operating mechanism. The operating mechanism controls the conductive rod 45 to move up and down, so as to achieve electrical connection or disconnection between the first conductive end 42 and the second conductive end 44, thereby realizing the operation of closing and opening the switch.

[0059] The shielding mechanism 5 includes an upper shielding cover 51 and a lower shielding cover 52. The upper shielding cover 51 is fixedly installed on the upper insulating contact base 41 and covers the first conductive end 42. The lower shielding cover 52 is disposed at the bottom of the upper shielding cover 51 and has a funnel structure with small upper and lower parts.

[0060] In use, by designing the lower shield 52 as a funnel structure with a larger upper part and a smaller lower part, it can cooperate with the upper shield 51 to effectively gather and guide the arc plasma and high-temperature airflow escaping from the bottom opening. This makes the airflow more directional and faster, significantly enhancing the "air blowing" effect, which can more effectively lengthen and cool the arc, thereby accelerating the extinction of the arc.

[0061] In this embodiment, the bottom outer wall of the upper shield 51 is provided with an external thread, and the top opening of the lower shield 52 is provided with an internal thread corresponding to the external thread. The lower shield 52 is threadedly connected to the bottom of the upper shield 51. The shielding mechanism 5 also includes a gas-generating material layer 53, which has a conical ring structure. The inner wall of the lower shield 52 is provided with an installation groove corresponding to the gas-generating material layer 53. After the lower shield 52 is threadedly connected to the upper shield 51, the gas-generating material layer 53 is fixedly installed in the installation groove.

[0062] When in use, the gas-generating material layer 53 decomposes under the high temperature of the electric arc to generate a large amount of arc-extinguishing gas. This arc-extinguishing gas can rapidly increase the pressure inside the insulating cylinder and work in synergy with the funnel structure to achieve the function of auxiliary arc extinguishing. Furthermore, the gas-generating material layer 53 can be quickly replaced by removing the shielding cover 52, thus extending the service life of the shielding mechanism 5.

[0063] In this embodiment, the gas-generating material layer 53 is made of polyamide or epoxy resin. Under the high temperature of the electric arc, the polyamide or epoxy resin will decompose instantly to generate a high-pressure mixed gas mainly composed of hydrogen and hydrocarbons, mixed with other gases, thereby extinguishing the arc.

[0064] In this embodiment, the upper shield 51 and the lower shield 52 are made of polyetheretherketone or polyetherimide.

[0065] The circuits, electronic components, and modules involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this utility model does not involve any improvement to the software and methods.

[0066] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

[0067] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An environmentally friendly gas-insulated load switch box, characterized in that, Includes enclosure, load switch, upper and lower inlet and outlet bushings, operating mechanism, and shielding mechanism; The enclosure is an airtight enclosure; The upper inlet / outlet sleeve and the lower inlet / outlet sleeve are disposed on the box wall of the box body; The load switch includes an upper insulating contact, a lower insulating contact, a first conductive end, a second conductive end, and a conductive rod; The upper insulating contact and the lower insulating contact are arranged vertically opposite to each other. The first conductive end is mounted on the upper insulating contact. The second conductive terminal is mounted on the lower insulating contact. The conductive rod is installed inside the lower insulating contact and connected to the operating mechanism. The operating mechanism controls the conductive rod to move up and down, which can make or break the electrical connection between the first conductive end and the second conductive end, so as to realize the operation of closing and opening the switch. The shielding mechanism includes an upper shield and a lower shield. The upper shield is fixedly installed on the upper insulating contact and covers the first conductive end. The lower shield is located at the bottom of the upper shield and has a funnel-shaped structure with small upper and lower parts.

2. The environmentally friendly gas-insulated load switch box according to claim 1, characterized in that, The bottom outer wall of the upper shield is provided with an external thread, and the top opening of the lower shield is provided with an internal thread corresponding to the external thread. The lower shield is threadedly connected to the bottom of the upper shield.

3. The environmentally friendly gas-insulated load switch box according to claim 2, characterized in that, The shielding mechanism also includes a gas-generating material layer, which has a conical ring structure. The inner wall of the lower shield is provided with an installation groove corresponding to the gas-generating material layer. After the lower shield is threadedly connected to the upper shield, the gas-generating material layer is fixedly installed in the installation groove.

4. The environmentally friendly gas-insulated load switch box according to claim 3, characterized in that, The gas-producing layer is made of polyamide or epoxy resin.

5. The environmentally friendly gas-insulated load switch gas box according to claim 4, characterized in that, The upper and lower shields are made of polyetheretherketone or polyetherimide.

Images