A surge arrester housing and a high-voltage surge arrester

Abstract

This utility model discloses a surge arrester housing and a high-voltage surge arrester, relating to the field of surge arresters. It includes a main surge arrester housing with an anti-splash mechanism on its exterior and a pressure relief mechanism inside. The anti-splash mechanism includes two fixing lugs, which are symmetrically clamped to the exterior of the main surge arrester housing by bolts and nuts. A conical anti-splash cover is fixedly connected to the outer ring of each fixing lug. Through the anti-splash mechanism, the conical structure, in conjunction with the spiral air guide groove, guides the high-temperature gas discharged from the pressure relief mechanism into a spiral downward airflow, preventing direct high-speed gas jets, slowing the airflow velocity, and preventing localized erosion damage to surrounding equipment. Furthermore, the filter plate intercepts tiny cavity fragments carried in the high-temperature gas, preventing fragments from splashing onto surrounding cables, insulators, and other equipment, reducing the risk of secondary damage.

Description

Technical Field

[0001] This utility model relates to the field of surge arresters, and in particular to a surge arrester housing and a high-voltage surge arrester. Background Technology

[0002] The surge arrester housing serves as the external structure that encloses and protects the core components inside the surge arrester (such as zinc oxide varistors, electrodes, and insulating parts). Its function revolves around "isolating risks and ensuring the stable operation of internal components." Furthermore, the high-voltage surge arrester is the "core device for overvoltage protection" in the power system. Its core function is to quickly conduct and limit the overvoltage to the equipment's tolerance range when lightning or switching overvoltage occurs, while simultaneously cutting off the subsequent power frequency follow current and restoring the system to normal operation.

[0003] In existing technologies, high-voltage surge arresters achieve sealing through the arrester housing to prevent the insulation resistance of internal insulating components (such as valve plates and leads) from decreasing due to moisture. They are also equipped with nonlinear resistance valve plates (mainly composed of zinc oxide (ZnO)) and pressure relief devices (safety devices). However, in actual use, when the device releases pressure, its internal exhaust path is singular and the flow rate is too fast. This can easily lead to local erosion damage when high-temperature gas is released. At the same time, during the exhaust process, high-temperature gas or small cavity fragments can easily splash onto surrounding equipment (such as cables and insulators), thereby increasing the risk of secondary damage.

[0004] Therefore, it is necessary to propose a surge arrester housing and a high-voltage surge arrester to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a surge arrester housing and a high-voltage surge arrester to solve the problems of traditional devices having a single exhaust path during pressure release, being easily eroded and damaged by excessively fast flow, and being prone to secondary damage caused by high-temperature gas and debris.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a surge arrester housing and a high-voltage surge arrester, comprising a surge arrester main housing, wherein an anti-splash mechanism is provided on the outside of the surge arrester main housing, and a pressure relief mechanism is provided inside the surge arrester main housing;

[0007] The anti-splash mechanism includes two fixed lugs, which are symmetrically clamped to the outside of the main housing of the surge arrester by bolts and nuts. A conical anti-splash cover is fixedly connected to the outer ring of the fixed lugs. A spiral air guide groove is opened on the inner side of the conical anti-splash cover. A filter plate is fixedly connected to the lower surface of the conical anti-splash cover.

[0008] The pressure relief mechanism is provided in four sets, and the pressure relief mechanism is evenly distributed on the side wall of the main housing of the surge arrester around the axis of the main housing. The pressure relief mechanism includes a pressure ring. A first through hole is opened on the side wall of the main housing of the surge arrester. The pressure ring is fixedly connected in the first through hole. A return spring is fixedly connected to the side of the pressure ring away from the axis of the main housing of the surge arrester. An air outlet is fixedly connected to the end of the return spring away from the pressure ring. A first through groove is opened at the corresponding position of the main housing of the surge arrester and the air outlet is slidably connected in the first through groove. A guide plate is fixedly connected to the inner wall of the air outlet. An air outlet hole is opened on the side wall of the air outlet. A fixing ring is fixedly connected to the side wall of the main housing of the surge arrester. A sealing ring is fixedly connected to the side of the fixing ring away from the axis of the main housing of the surge arrester. The side of the sealing ring away from the fixing ring is in close contact with the side of the air outlet close to the axis of the main housing of the surge arrester.

[0009] Preferably, the end of the first through hole that connects to the outside of the main housing of the surge arrester is conical, and the diameter of the conical slot slightly increases from the inside to the outside.

[0010] Preferably, a rain-shielding skirt is fixedly connected to the outer wall of the main housing of the surge arrester.

[0011] Preferably, an upper end cover is fixedly connected to the upper end face of the main housing of the surge arrester.

[0012] Preferably, a lower end cover is fixedly connected to the lower end face of the main housing of the surge arrester.

[0013] This utility model also discloses a high-voltage surge arrester, including a surge arrester housing.

[0014] The technical effects and advantages of this utility model are as follows:

[0015] 1. The anti-splash mechanism in this utility model, through the cooperation of the conical structure and the spiral air guide groove, guides the high-temperature gas discharged by the pressure relief mechanism into a spiral downward airflow, avoiding direct high-speed gas injection, slowing down the airflow velocity, preventing local scouring and damage to surrounding equipment, and intercepting the small cavity fragments carried in the high-temperature gas through the filter plate, preventing the fragments from splashing to the surrounding cables, insulators and other equipment, reducing the risk of secondary damage.

[0016] 2. Furthermore, by utilizing the evenly distributed pressure relief mechanism, the limitations of a single exhaust path are broken, enabling multi-directional synchronous pressure relief, effectively reducing the rate of pressure rise in the inner cavity of the casing, and preventing the casing from cracking due to excessive local pressure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external structure of the high-voltage surge arrester of this utility model.

[0018] Figure 2 This is a front cross-sectional view of the high-voltage surge arrester of this utility model.

[0019] Figure 3 This is a schematic diagram of the unfolded structure of the anti-splash mechanism of this utility model.

[0020] Figure 4 This is a schematic diagram of the unfolded structure of the pressure relief mechanism of this utility model.

[0021] Figure 5 This utility model Figure 2 Enlarged structural diagram at point A in the middle.

[0022] In the diagram: 1. Main housing of surge arrester; 2. Rainproof skirt; 3. Upper end cover; 4. Lower end cover; 5. Anti-splash mechanism; 6. Pressure relief mechanism; 7. Zinc oxide valve plate; 51. Fixing lug; 52. Conical anti-splash cover; 53. Spiral air guide groove; 54. Filter plate; 61. Pressure ring; 62. Return spring; 63. Air outlet; 64. Fixing ring; 65. Sealing ring; 66. Air outlet; 67. Guide plate. Detailed Implementation

[0023] This utility model provides, for example Figures 1-5 The surge arrester housing and high-voltage surge arrester shown are designed to solve the problems of single exhaust path, excessively fast flow rate causing erosion damage, and high-temperature gas and debris causing secondary damage during pressure release in traditional devices. The high-voltage surge arrester involved in this embodiment takes the surge arrester main housing 1 as the core load-bearing structure and integrates multiple functional modules such as anti-splash, pressure relief, and insulation protection. Its overall structure includes: surge arrester main housing 1, rain umbrella skirt 2 fixed to the outside of the housing, upper end cover 3 and lower end cover 4 sealing both ends of the housing, anti-splash mechanism 5 for preventing exhaust splash, pressure relief mechanism 6 for realizing multi-path pressure relief, and zinc oxide valve plate 7 built into the housing cavity.

[0024] The main housing 1 of the surge arrester is made of high-strength insulating materials such as epoxy resin glass fiber composite material. It has a cylindrical cavity structure. The side wall is pre-set with a first through groove and a conical groove (the diameter of the conical groove is slightly enlarged from the inside to the outside) to cooperate with the pressure relief mechanism 6. The axis is consistent with the air outlet 63. The two ends are respectively connected to the upper end cover 3 and the lower end cover 4 by bolts to ensure the sealing of the internal cavity. As the core load-bearing component, it provides a closed installation space for internal components such as zinc oxide valve plate 7 and lead wires, and isolates external moisture, dust and other impurities to prevent the internal insulating components from getting damp and causing a decrease in insulation resistance. At the same time, it provides a fixed foundation for the rain umbrella skirt 2, the splash protection mechanism 5 and the pressure relief mechanism 6.

[0025] The rain umbrella skirt 2 is made of silicone rubber material and is integrally molded or bonded to the outer wall of the main housing 1 of the surge arrester through a molding process.

[0026] Both the upper cover 3 and the lower cover 4 are made of metal or high-strength insulating material. Rubber sealing rings are installed on the connection surfaces with the main housing 1 of the surge arrester, and the cavity is sealed by bolts evenly distributed around the circumference. The upper cover 3 has a pre-drilled hole for a high-voltage wiring terminal, and the lower cover 4 has a pre-drilled hole for a grounding terminal, facilitating connection to external circuits.

[0027] The zinc oxide valve plate 7 is mainly composed of zinc oxide (ZnO). It is made into a disc shape using ceramic sintering technology. Multiple valve plates are stacked axially along the main housing 1 of the surge arrester. The valve plates are conductively connected by metal gaskets. The two ends are electrically connected to the wiring terminals of the upper end cover 3 and the grounding terminal of the lower end cover 4, respectively. The whole is located in a sealed housing cavity. Utilizing the nonlinear resistance characteristics of zinc oxide material, it is in a high-resistance state during normal operation, with only a small leakage current flowing through it. When the system experiences a lightning strike or operational overvoltage, the resistance of the valve plate quickly drops to a low-resistance state, limiting the overvoltage to a safe range and discharging the overcurrent to the ground. After the voltage returns to normal, the valve plate automatically returns to the high-resistance state, ensuring the normal operation of the system.

[0028] In the anti-splash mechanism 5, the fixed lugs 51 have a semi-circular structure, and there are two of them. The inner walls of the two lugs are fitted against the outer wall of the main housing 1 of the surge arrester. They are symmetrically clamped to the outside of the housing by bolts and nuts that pass through the lugs, located on the outside of the pressure relief mechanism 6, to ensure a firm fixation. The conical anti-splash cover 52 is made of high-temperature resistant metal or high-strength engineering plastic, and has an inverted conical structure with the larger opening facing down and the smaller opening facing up. Its upper inner ring is welded to the outer ring of the two fixed lugs 51. The cover covers the entire outer area of ​​the pressure relief mechanism 6. The spiral air guide groove 53 extends spirally from the upper end to the lower end of the cover on the inner wall of the conical anti-splash cover 52. The width and depth of the air guide channel are designed according to the expected exhaust volume to ensure that the gas can flow along the channel. The filter plate 54 is fixed to the lower surface of the conical splash guard 52 by bolts, covering the lower opening of the guard. Through the cooperation of the conical structure and the spiral air guide channel 53, the high-temperature gas discharged by the pressure relief mechanism 6 is guided into a spiral downward airflow, avoiding direct high-speed gas injection, slowing down the airflow velocity, preventing local scouring damage to surrounding equipment, and the filter plate 54 intercepts small cavity fragments carried in the high-temperature gas, such as insulation debris that may be generated inside the shell, preventing the fragments from splashing to surrounding cables, insulators and other equipment, reducing the risk of secondary damage.

[0029] The conical splash guard 52 in the pressure relief mechanism 6 can prevent external rainwater and dust from entering the vent 66 of the pressure relief mechanism 6, avoiding jamming or sealing failure of the pressure relief mechanism. Four sets are set, evenly distributed on the side wall of the main housing 1 of the surge arrester with adjacent sets at an angle of 90°, ensuring uniform force on the housing during pressure release and avoiding localized stress concentration that could damage the housing. The pressure ring 61, made of metal, has a ring structure and is fixed to the inner side of the first through groove on the side wall of the main housing 1 of the surge arrester by welding or interference fit, becoming an integral part of the housing. It provides fixed support for the return spring 62. The return spring 62 is made of high-temperature resistant spring steel and is evenly distributed along the circumference of the pressure ring 61. One end is welded to the pressure ring 61 or hooked to it, and the other end is welded to the inner wall of the vent 63, ensuring that the vent 63 and the sealing ring 6 are properly aligned. 5. The vent cylinder 63 is made of metal and has a cylindrical tubular structure. One end is open and faces the inner cavity of the housing, while the other end is closed. Multiple circular vent holes 66 are evenly distributed along the circumference on the side wall. The outer diameter of the vent cylinder 63 matches the inner diameter of the first through groove of the main housing 1 of the surge arrester, and it can slide axially in the through groove. The fixing ring 64 and the sealing ring 65 are used. The fixing ring 64 is a metal ring structure and is welded to the outside of the first through groove on the side wall of the main housing 1 of the surge arrester, opposite to the end face of the vent cylinder 63. The sealing ring 65 is made of high-temperature resistant rubber and is fixed to the end face of the fixing ring 64 by bonding. In the initial state, it is tightly fitted to the end face of the vent cylinder 63 to achieve a seal. The guide plate 67 is arc-shaped or inclined and is fixed to the inner wall of the vent cylinder 63 near the opening end to guide the gas in the inner cavity of the housing to flow to the vent holes 66.

[0030] Therefore, the four pressure relief mechanisms 6 are evenly distributed, breaking the limitations of the traditional single exhaust path and realizing multi-directional synchronous pressure relief. This effectively reduces the pressure rise rate inside the housing and avoids the housing from bursting due to excessive local pressure. During normal operation, the elastic force of the return spring 62 pulls the exhaust cylinder 63 to fit tightly with the sealing ring 65, ensuring the housing's sealing performance. When the housing cavity experiences a fault, such as valve plate breakdown or internal arc generating high-pressure gas, the gas pressure overcomes the elastic force of the return spring 62, pushing the exhaust cylinder 63 to slide outward. The sealing ring 65 is disengaged from the sealing state, and the high-pressure gas is guided through the inside of the exhaust cylinder 63 and the guide plate 67 to the exhaust hole 66 for discharge. After the pressure is released, the return spring 62 drives the exhaust cylinder 63 to reset and re-fit with the sealing ring 65, restoring the seal. At the same time, through the tubular structure of the exhaust cylinder 63 and the guiding effect of the guide plate 67, the high-pressure gas undergoes a mid-stream diversion process during discharge, reducing the gas flow rate. Combined with the spiral air guide groove 53 of the anti-splash mechanism 5, this further prevents high-speed airflow from scouring and damaging surrounding equipment.

Claims

1. A surge arrester housing, comprising a surge arrester main housing (1), characterized in that: The main housing (1) of the surge arrester is provided with an anti-splash mechanism (5) on the outside and a pressure relief mechanism (6) on the inside. The anti-splash mechanism (5) includes a fixed lug (51), and there are two fixed lugs (51). The two fixed lugs (51) are symmetrically clamped to the outside of the main housing (1) of the surge arrester by bolts and nuts. A conical anti-splash cover (52) is fixedly connected to the outer ring of the fixed lug (51). A spiral air guide groove (53) is opened on the inner side of the conical anti-splash cover (52). A filter plate (54) is fixedly connected to the lower surface of the conical anti-splash cover (52). The pressure relief mechanism (6) is provided in four sets. The pressure relief mechanism (6) is evenly distributed on the side wall of the main housing (1) of the surge arrester with respect to the axis of the main housing (1). The pressure relief mechanism (6) includes a pressure ring (61). A first through hole is opened on the side wall of the main housing (1) of the surge arrester. The pressure ring (61) is fixedly connected in the first through hole. A return spring (62) is fixedly connected to the side of the pressure ring (61) away from the axis of the main housing (1) of the surge arrester. An air outlet (63) is fixedly connected to the end of the return spring (62) away from the pressure ring (61). The main housing (1) of the surge arrester and the air outlet... A first through groove is provided at the corresponding position of the air cylinder (63). The air cylinder (63) is slidably connected in the first through groove. A guide plate (67) is fixedly connected to the inner wall of the air cylinder (63). An air outlet hole (66) is provided on the side wall of the air cylinder (63). A fixing ring (64) is fixedly connected to the side wall of the main housing (1) of the surge arrester. A sealing ring (65) is fixedly connected to the side of the fixing ring (64) away from the axis of the main housing (1) of the surge arrester. The side of the sealing ring (65) away from the fixing ring (64) is in close contact with the side of the air cylinder (63) close to the axis of the main housing (1) of the surge arrester.

2. The surge arrester housing according to claim 1, characterized in that: The first through hole connects to the outside of the main housing (1) of the surge arrester. One end of the through hole is conical, and the diameter of the conical slot is slightly enlarged from the inside to the outside.

3. The surge arrester housing according to claim 2, characterized in that: The outer wall of the main housing (1) of the surge arrester is fixedly connected to a rain umbrella skirt (2).

4. The surge arrester housing according to claim 3, characterized in that: The upper end cover (3) is fixedly connected to the upper end face of the main housing (1) of the surge arrester.

5. A surge arrester housing according to claim 4, characterized in that: The lower end cover (4) is fixedly connected to the lower end face of the main housing (1) of the surge arrester.

6. A high-voltage surge arrester, characterized in that, It includes the surge arrester housing as described in any one of claims 1-5, and includes a zinc oxide valve plate (7) disposed inside the cavity of the surge arrester main housing (1).

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