Improved porcelain jacket lightning arrester

Abstract

The utility model discloses an improved lightning arrester with a porcelain jacket. The improved lightning arrester comprises the porcelain jacket, a resistor disc core body, an explosion-proof cylinder and a flange, a containing groove is formed in one end of the porcelain outer sleeve, the resistor disc core body is arranged in the containing groove, the anti-explosion barrel is arranged on the periphery of the resistor disc core body, a plurality of pressure releasing grooves are formed in the peripheral face of the anti-explosion barrel, and the flange is detachably installed at a groove opening of the containing groove. By adopting the above arrangement, the internal pressure can be effectively released, the lightning arrester damage caused by the internal pressure is reduced, and the safety is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of arrester structures, and particularly relates to an improved porcelain housing arrester. Background Art

[0002] In arresters, the current-carrying capacity, sealing performance, and pressure relief are usually the key factors affecting the long-term stable operation of the arrester itself. When the arrester withstands overcurrent, high temperature may be generated inside, which may further cause gas expansion and form high pressure. A higher current-carrying capacity means that the arrester needs to withstand a greater current, which may lead to a higher internal pressure. Therefore, to ensure the safe operation of the arrester, it is necessary to ensure that the pressure relief structure can effectively cope with this pressure.

[0003] Porcelain housings and composite housings are two common types of arrester housings. The composite housing has good sealing performance, but the silicone rubber material is exposed to the atmospheric environment all year round and is often eroded by harsh climate environments such as sunlight, sand, rain, high temperature, and cold. Silicone rubber is an organic polymer, and its silicon-oxygen bond and silicon-carbon bond exist in the form of covalent bonds, which are weaker than the bonding bonds in glass and ceramic materials. Therefore, under the action of various operating stresses and environmental factors (such as surface discharge, corona discharge, ultraviolet radiation, rain and fog, etc.), the problem of material aging will inevitably occur. Relatively speaking, the porcelain housing is relatively more stable.

[0004] Porcelain housing arresters usually adopt a closed structure to prevent the influence of the external environment (such as moisture). However, this closed design may limit the effective release of pressure. If a fault occurs inside and causes the pressure to increase, the porcelain housing arrester may not have enough space to accommodate the expanded gas, which may lead to a rapid rise in pressure. Moreover, although porcelain materials have good insulation performance and high-temperature resistance, they are brittle and easy to break. During the pressure relief process, if the pressure is too high, the porcelain housing may crack, which will not only damage the arrester itself, but also the flying porcelain fragments may pose a safety threat to the surrounding environment. Content of the Utility Model

[0005] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide an improved porcelain housing arrester, which can effectively release the internal pressure, reduce the damage of the arrester caused by the internal pressure, and improve the safety.

[0006] The purpose of the utility model is achieved by the following technical solutions:

[0007] An improved porcelain jacket lightning arrester comprises a porcelain jacket, a resistor core, an explosion-proof tube and a flange; a receiving groove is provided at one end of the porcelain jacket, the resistor core is arranged in the receiving groove, the explosion-proof tube is arranged on the periphery of the resistor core, a plurality of pressure release grooves are provided on the outer peripheral surface of the explosion-proof tube, and the flange is detachably mounted on the notch of the receiving groove.

[0008] Furthermore, a plurality of grooves are formed on the end surface of the flange facing the accommodating groove.

[0009] Furthermore, it also includes oil felt, which is arranged between the resistor core and the flange, and the oil felt is fixedly arranged on the end surface of the flange, and the oil felt covers a plurality of the grooves.

[0010] Furthermore, the groove extends to the end surface of the flange facing away from the accommodating groove.

[0011] Furthermore, the resistor core includes a core, a resistor, an upper electrode and a lower electrode. The resistor is arranged on the core, and the resistor is built into the explosion-proof tube. The upper electrode and the lower electrode are respectively arranged at two ends of the core, and the lower electrode is located on one side close to the notch of the accommodating groove.

[0012] Furthermore, the resistor is a resistor of type no smaller than D5.

[0013] Furthermore, an explosion-proof waterproof tape is provided on the outer peripheral surface of the explosion-proof cylinder, and the explosion-proof waterproof tape covers a plurality of the pressure release grooves.

[0014] Furthermore, the thickness of the explosion-proof cylinder is 4 mm to 5 mm, the pressure release grooves are evenly distributed on the outer circumference of the explosion-proof cylinder, the size of the pressure release grooves ranges from 20 mm to 30 mm, and the depth of the pressure release grooves is 3 mm to 4 mm.

[0015] Furthermore, the explosion-proof cylinder is made of insulating material.

[0016] The utility model has the following beneficial effects:

[0017] 1. Good pressure release capability: By adopting explosion-proof insulating cylinders with multiple pressure release grooves, oil felt and open flanges with multiple grooves, the pressure is released through the pressure release grooves, and the pressure breaks through the oil felt and releases the pressure through the grooves of the open flange, so that the arrester has good pressure release capability and prevents the faulty arrester from bursting.

[0018] 2. Good sealing performance: By evenly wrapping the high temperature resistant waterproof tape on the outside of the explosion-proof insulation tube, it is ensured that the zinc oxide resistor core will not deteriorate due to moisture, thus improving the sealing performance of the arrester.

[0019] 3. With large current-carrying capacity: The varistor uses a varistor not less than D5 type, and the varistor is built into the explosion-proof insulating cylinder to ensure reliable contact between varistors and ensure that the lightning arrester has large current-carrying capacity.

[0020] 4. High mechanical strength: The explosion-proof insulating cylinder is made of an epoxy glass fiber material cylinder, which has good insulation performance and mechanical properties, ensuring that during production and assembly, the core will not be deformed by external mechanical force and affect the current-carrying performance. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0022] Figure 2 It is a schematic diagram of the flange structure of the present utility model.

[0023] In the figure: 1, porcelain outer casing; 11, accommodation groove; 2, varistor core; 21, core; 22, varistor; 23, upper pole piece; 24, lower pole piece; 3, explosion-proof cylinder; 31, pressure relief groove; 4, explosion-proof and waterproof tape; 5, flange; 51, groove; 6, felt. Detailed Description of the Preferred Embodiment

[0024] The following further details the present utility model in conjunction with the drawings and specific embodiments. Terms such as "upper", "inner", "middle", "left", "right", and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present utility model. Changes or adjustments in their relative relationships shall also be regarded as the scope of implementation of the present utility model without substantial changes in technical content.

[0025] The improved porcelain outer casing lightning arrester of the present utility model has better lightning protection level, weather resistance, mechanical strength, pressure release ability, sealing performance, and large current-carrying capacity compared with the conventional porcelain outer casing lightning arrester in the prior art. The following details the structure of the improved porcelain outer casing lightning arrester of the present utility model.

[0026] As Figure 1 and Figure 2 shown, an improved porcelain outer casing lightning arrester includes a porcelain outer casing 1, a varistor core 2, an explosion-proof cylinder 3, and a flange 5. One end of the porcelain outer casing 1 is provided with an accommodation groove 11. The varistor core 2 uses a zinc oxide varistor core 2. The varistor core 2 is arranged in the accommodation groove 11. The explosion-proof cylinder 3 is sleeved and fixed on the outer periphery of the varistor core 2. A plurality of pressure relief grooves 31 are provided on the outer peripheral surface of the explosion-proof cylinder 3. The flange 5 is detachably installed at the notch of the accommodation groove 11. The detachable manner of the flange 5 can adopt ways such as threaded fit or interference fit by insertion.

[0027] Among them, the explosion-proof tube 3 is made of insulating material, and the insulating material can be made of epoxy glass fiber limiting material, which can improve the insulation and mechanical properties of the porcelain sheathed lightning arrester to ensure that during production and assembly, the deformation of the resistor core 2 caused by external mechanical force is reduced to affect the current flow performance.

[0028] At the same time, the thickness of the explosion-proof tube 3 is 4 mm to 5 mm, the pressure release grooves 31 are evenly distributed on the outer peripheral surface of the explosion-proof tube 3, the size of the pressure release grooves 31 ranges from 20 mm to 30 mm, and the depth of the pressure release grooves 31 is 3 mm to 4 mm. Therefore, by limiting the thickness of the explosion-proof tube 3, the size and distribution of the pressure release grooves 31, the pressure release capacity of the porcelain jacket arrester can be better improved.

[0029] In order to further improve the pressure release capability of the porcelain jacket arrester, the present embodiment also adopts the following settings:

[0030] The end surface of the flange 5 facing the accommodating groove 11 is provided with a plurality of grooves, and the grooves extend to the end surface of the flange 5 away from the accommodating groove 11. Therefore, after the pressure of the porcelain jacket arrester is released through the pressure release groove 31, the pressure can be further released through the grooves, thereby enhancing the pressure release capacity of the porcelain jacket arrester to prevent the porcelain jacket arrester from bursting.

[0031] At the same time, the core 21 of the porcelain jacket 1 of the utility model also includes oil felt, which is arranged between the resistor core 2 and the flange 5, and is fixedly arranged on the end surface of the flange 5, and the oil felt covers a plurality of grooves. Therefore, after the pressure is released through the pressure release groove 31, the pressure will first pass through the oil felt, and then the pressure will be released by the groove after breaking through the oil felt, wherein the oil felt plays a better buffering role, so that the porcelain jacket arrester has a good pressure release ability and prevents the porcelain jacket arrester from bursting.

[0032] In order to improve the sealing performance of the porcelain jacket arrester, the outer circumference of the explosion-proof tube 3 is evenly wrapped with an explosion-proof waterproof tape 4, which covers a number of pressure release grooves 31; by providing the explosion-proof waterproof tape 4, it is ensured that the resistor core 2 is not deteriorated due to moisture, and the sealing performance of the porcelain jacket arrester can be improved.

[0033] The resistor core 2 of the utility model includes a core 21, a resistor 22, an upper electrode and a lower electrode. The resistor 22 is arranged on the core 21, and the resistor 22 is built in the explosion-proof tube 3. The upper electrode and the lower electrode are respectively arranged at both ends of the core 21, and the lower electrode is located on one side close to the notch of the accommodating groove 11. Among them, the resistor 22 adopts a resistor 22 of not less than D5 type, which can ensure that the porcelain jacket arrester has a large current capacity. At the same time, the resistor 22 is built in the explosion-proof tube 3, which can ensure reliable contact between the resistors 22 and ensure that the porcelain jacket arrester has a large current capacity.

[0034] During use, when a fault occurs inside the porcelain housing arrester (such as internal flashover or overheating), the heat generated by the fault will cause the internal gas to expand, and the internal gas pressure will rise rapidly. When the internal pressure reaches a certain value, the expanded air passes through the pressure release groove 31 of the explosion-proof cylinder 3, passes through the accommodation groove 11 of the porcelain housing 1, and then passes through the felt at the bottom. After the pressure breaks through the felt, it is released to the external atmosphere through the groove, thereby reducing the internal pressure. Thus, in the case of a fault in the resistor chip core 2, the porcelain housing 1 of the arrester can avoid cracking due to excessive internal pressure, thereby preventing the harm caused by the splashing of porcelain pieces due to explosion.

[0035] The implementation manners of the present utility model are not limited thereto. According to the above content of the present utility model, by using the ordinary technical knowledge and conventional means in the art, without departing from the above basic technical idea of the present utility model, the present utility model can also be modified, replaced or combined in many other forms, all of which fall within the scope of the protection of the rights of the present utility model.

Claims

1. An improved porcelain housing lightning arrester, characterized in that, It includes a porcelain outer sleeve, a resistor core, an explosion-proof tube and a flange; a receiving groove is provided at one end of the porcelain outer sleeve, the resistor core is arranged in the receiving groove, the explosion-proof tube is arranged at the periphery of the resistor core, a plurality of pressure release grooves are provided on the outer peripheral surface of the explosion-proof tube, and the flange is detachably mounted on the notch of the receiving groove.

2. The improved porcelain housing lightning arrester according to claim 1, characterized in that, The end surface of the flange facing the accommodating groove is provided with a plurality of grooves.

3. The improved porcelain housing lightning arrester according to claim 2, characterized in that It also includes oil felt, which is arranged between the resistor core and the flange. The oil felt is fixed on the end surface of the flange, and the oil felt covers a plurality of the grooves.

4. The improved porcelain housing lightning arrester according to claim 2 or 3, characterized in that, The groove extends to an end surface of the flange facing away from the accommodating groove.

5. The improved porcelain housing lightning arrester according to claim 1, characterized in that, The resistor core includes a core, a resistor, an upper electrode and a lower electrode. The resistor is arranged on the core and built into the explosion-proof tube. The upper electrode and the lower electrode are respectively arranged at two ends of the core, and the lower electrode is located on a side close to the notch of the accommodating groove.

6. The improved porcelain housing arrester according to claim 5, characterized in that, The resistor is a resistor of type no smaller than D5.

7. The improved porcelain housing arrester according to claim 1, characterized in that, An explosion-proof waterproof tape is arranged on the outer peripheral surface of the explosion-proof cylinder, and the explosion-proof waterproof tape covers a plurality of the pressure release grooves.

8. The improved porcelain housing lightning arrester according to claim 1, characterized in that, The thickness of the explosion-proof cylinder is 4 mm to 5 mm, the pressure release grooves are evenly distributed on the outer circumference of the explosion-proof cylinder, the size of the pressure release grooves ranges from 20 mm to 30 mm, and the depth of the pressure release grooves is 3 mm to 4 mm.

9. The improved porcelain housing lightning arrester according to claim 1, characterized in that, The explosion-proof cylinder is made of insulating material.

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