Lightning arrester for insulator

Abstract

This utility model discloses a surge arrester that also functions as an insulator, belonging to the field of surge arrester technology. The surge arrester includes a surge arrester body with a composite outer sleeve. An insulator string is fixedly connected to the outer end of the composite outer sleeve. In this utility model, after the composite outer sleeve is fitted onto the outside of the core rod, an aluminum cap and steel feet can be fitted onto the left and right ends of the core rod respectively. At this time, a second wedge block presses against a first wedge block, causing the rubber pad to deform under force. The thickness of the rubber pad is greater than the maximum vertical length of the second wedge block, avoiding obstruction to the movement of the second wedge block. When the aluminum cap is completely fitted onto the outside of the core rod, the first and second wedge blocks are in a staggered, snap-fit ​​state, allowing for quick installation of the aluminum cap and steel feet. Simultaneously, the movement of the aluminum cap and steel feet can drive the insertion block to be inserted between the arc-shaped plate and the core rod, preventing the arc-shaped plate from moving under force and improving the stability of the aluminum cap and steel feet installation.

Description

Technical Field

[0001] This utility model relates to the field of surge arrester technology, and more specifically, to a surge arrester that also functions as an insulator. Background Technology

[0002] Lightning strikes on overhead power lines can easily cause lightning overvoltage or induced overvoltage, leading to insulator flashover or breakdown. The power frequency arc can continuously concentrate at the breakdown point of the insulation layer, causing the insulated conductor to melt and break. To prevent such accidents, lightning protection measures are needed on overhead lines. In this case, a surge arrester that also functions as an insulator is required.

[0003] In practical applications, existing surge arresters that also function as insulators require the arrester core to be fitted inside the insulator string and then the two to be fixed together to achieve both insulation and lightning protection. However, the installation process of fitting the arrester core is quite cumbersome, making it impossible to quickly fit the arrester core and the insulator string together, and they cannot be separated. Therefore, there is an urgent need to improve the technology of the surge arrester structure to perfect this device. Utility Model Content

[0004] 1. Technical problem to be solved: To address the problems existing in the prior art, the purpose of this utility model is to provide a surge arrester that also functions as an insulator. When using this surge arrester as an insulator, after the composite outer sleeve is fitted over the outside of the core rod, the aluminum cap and steel foot can be respectively fitted onto the left and right ends of the core rod. The aluminum cap and steel foot are respectively fitted onto the two ends of the core rod through a snap-fit ​​mechanism, which allows for quick installation of the aluminum cap and steel foot. At the same time, the insertion block can prevent the arc plate from moving under force, thus improving the stability of the installation of the aluminum cap and steel foot.

[0005] 2. Technical Solution: To solve the above problems, the present invention adopts the following technical solution.

[0006] A surge arrester that also functions as an insulator includes a surge arrester body, an outer composite jacket, an insulator string fixedly connected to the outer end of the composite jacket, a core rod sleeved inside the composite jacket, a first sealing ring at the contact point between the core rod and the composite jacket, an aluminum cap sleeved on the left end of the core rod, a second sealing ring at the contact point between the aluminum cap and the composite jacket, a steel foot sleeved on the right end of the core rod, and a snap-fit ​​mechanism between the aluminum cap and the core rod, and between the steel foot and the core rod, the snap-fit ​​mechanism fixing the aluminum cap and the steel foot to the core rod.

[0007] Preferably, the second sealing ring has an annular cavity inside, and the materials of the second sealing ring and the first sealing ring are HNBR hydrogenated nitrile butadiene rubber.

[0008] Preferably, the mandrel has arc-shaped plates on both the upper and lower sides corresponding to the aluminum cap and steel foot. A connecting groove is formed at the outer end of the arc-shaped plate corresponding to the mandrel. A connecting block is fixedly connected to the end of the arc-shaped plate near the mandrel. The connecting block is located in the connecting groove. A rubber pad is glued to the end of the connecting block away from the arc-shaped plate. Multiple first wedge blocks are fixedly connected to the outer end of the arc-shaped plate away from the mandrel. Multiple second wedge blocks are fixedly connected to the inner wall of the aluminum cap and steel foot. The first wedge blocks and second wedge blocks are staggered. Insert blocks are fixedly connected to the inner wall of both the aluminum cap and steel foot. The insert blocks are located between the arc-shaped plate and the mandrel.

[0009] Preferably, the cross-section of the connecting groove and the connecting block is T-shaped, and the overall external dimensions of the connecting block and the rubber pad are adapted to the internal dimensions of the connecting groove.

[0010] Preferably, the thickness of the rubber pad is greater than the maximum vertical length of the second wedge block.

[0011] Preferably, both the first wedge block and the second wedge block are sloped. The slope height of the first wedge block gradually increases from the mandrel towards the composite jacket, and the slope height of the second wedge block gradually increases from the composite jacket towards the mandrel. The end of the insert block near the arc plate is inclined.

[0012] 3. Beneficial effects: Compared with the prior art, the beneficial effects of this utility model are as follows: (1) In this utility model, after the composite jacket is fitted onto the outside of the mandrel, the aluminum cap and steel foot can be fitted onto the left and right ends of the mandrel respectively. At this time, the second wedge block squeezes the first wedge block, causing the rubber pad to deform under force. The thickness of the rubber pad is greater than the maximum vertical length of the second wedge block, so as to avoid hindering the movement of the second wedge block. When the aluminum cap is fully fitted onto the outside of the mandrel, the first wedge block and the second wedge block are in a staggered snap-fit ​​state, which can quickly install the aluminum cap and steel foot. At the same time, when the aluminum cap and steel foot move, they can drive the insert block to be inserted between the arc plate and the mandrel, avoiding the arc plate from moving under force, and improving the stability of the installation of the aluminum cap and steel foot.

[0013] (2) In this utility model, the core rod is moved into the interior of the composite jacket. The outer end of the core rod is fitted with a Duratin core. The core rod is sealed to the composite jacket through the first sealing ring. Then, the aluminum cap and steel foot are respectively fitted to the two ends of the core rod through the snap-fit ​​mechanism and sealed to the composite jacket through the second sealing ring. This device integrates the column-type composite insulator with lightning protection. Its function is to divert the lightning current to the ground when lightning strikes the overhead insulated line, thereby protecting the overhead insulated line, improving the lightning resistance level of the transmission line, and reducing lightning accidents and tripping rates. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the internal cross-sectional structure of this utility model; Figure 3 This utility model Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0015] 1. Surge arrester body; 2. Composite jacket; 3. Insulator string; 4. Core rod; 5. First sealing ring; 6. Aluminum cap; 7. Steel foot; 8. Second sealing ring; 9. Arc plate; 10. Connecting groove; 11. Connecting block; 12. Rubber pad; 13. First wedge block; 14. Second wedge block; 15. Insert block. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model. Example

[0017] Please see Figure 1-3 A surge arrester that also functions as an insulator includes a surge arrester body 1, a composite jacket 2 on the outside of the surge arrester body 1, an insulator string 3 fixedly connected to the outer end of the composite jacket 2, a core rod 4 sleeved inside the composite jacket 2, a first sealing ring 5 at the contact point between the core rod 4 and the composite jacket 2, an aluminum cap 6 sleeved on the left end of the core rod 4, a second sealing ring 8 at the contact point between the aluminum cap 6 and the composite jacket 2, a steel foot 7 sleeved on the right end of the core rod 4, and a snap-fit ​​mechanism between the aluminum cap 6 and the core rod 4, and between the steel foot 7 and the core rod 4, the snap-fit ​​mechanism can fix the aluminum cap 6 and the steel foot 7 to the core rod 4.

[0018] After the composite jacket 2 is fitted onto the outside of the mandrel 4, the aluminum cap 6 and the steel foot 7 can be fitted onto the left and right ends of the mandrel 4 respectively. At this time, the second wedge block 14 presses against the first wedge block 13, causing the rubber pad 12 to deform under force. The thickness of the rubber pad 12 is greater than the maximum vertical length of the second wedge block 14, so as to avoid obstructing the movement of the second wedge block 14. When the aluminum cap 6 is fully fitted onto the outside of the mandrel 4, the first wedge block 13 and the second wedge block 14 are in a staggered and snapped state, which allows the aluminum cap 6 and the steel foot 7 to be installed quickly. At the same time, when the aluminum cap 6 and the steel foot 7 move, they can drive the insert block 15 to be inserted between the arc plate 9 and the mandrel 4, preventing the arc plate 9 from moving under force and improving the stability of the installation of the aluminum cap 6 and the steel foot 7.

[0019] Please see Figure 1-3 The second sealing ring 8 has an annular cavity inside. Both the second sealing ring 8 and the first sealing ring 5 are made of HNBR hydrogenated nitrile butadiene rubber. The annular cavity inside the second sealing ring 8 allows for a certain interference fit when the aluminum cap 6 and steel foot 7 contact the outer end of the composite outer sleeve 2, facilitating the fitting and installation of the aluminum cap 6 and steel foot 7. The mandrel 4 has arc-shaped plates 9 on both the upper and lower sides corresponding to the aluminum cap 6 and steel foot 7. A connecting groove 10 is provided at the outer end of the mandrel 4 corresponding to the arc-shaped plates 9. The arc-shaped plates 9 are close to... A connecting block 11 is fixedly connected to one end near the core rod 4. The connecting block 11 is located in the connecting groove 10. A rubber pad 12 is glued to the end of the connecting block 11 away from the arc plate 9. Multiple first wedge blocks 13 are fixedly connected to the outer end of the arc plate 9 away from the core rod 4. Multiple second wedge blocks 14 are fixedly connected to the inner walls of the aluminum cap 6 and the steel foot 7. The first wedge blocks 13 and the second wedge blocks 14 are staggered. Insert blocks 15 are fixedly connected to the inner walls of both the aluminum cap 6 and the steel foot 7. The insert blocks 15 are located between the arc plate 9 and the core rod 4.

[0020] Please see Figure 2-3 The connecting groove 10 and the connecting block 11 have a T-shaped cross section. The overall external dimensions of the connecting block 11 and the rubber pad 12 are adapted to the internal dimensions of the connecting groove 10. The thickness of the rubber pad 12 is greater than the maximum vertical length of the second wedge block 14. The first wedge block 13 and the second wedge block 14 are both sloped. The slope height of the first wedge block 13 gradually increases from the mandrel 4 toward the composite jacket 2. The slope height of the second wedge block 14 gradually increases from the composite jacket 2 toward the mandrel 4. The end of the insert 15 near the arc plate 9 is inclined. By setting the end of the insert 15 near the arc plate 9 to be inclined, the sharper end of the insert 15 can be smoothly inserted between the arc plate 9 and the mandrel 4, avoiding the arc plate 9 from moving randomly under force and affecting the stability of the installation.

[0021] Working principle: When this surge arrester, which also serves as an insulator, is used, firstly, the core rod 4 is moved into the interior of the composite jacket 2. The outer end of the core rod 4 is fitted with a Duratin core. The core rod 4 is sealed to the composite jacket 2 through the first sealing ring 5. The aluminum cap 6 and the steel foot 7 are respectively fitted onto the left and right ends of the core rod 4. At this time, the second wedge block 14 presses against the first wedge block 13, causing the rubber pad 12 to deform under force. The thickness of the rubber pad 12 is greater than the maximum vertical length of the second wedge block 14, so as to avoid obstructing the movement of the second wedge block 14. After the aluminum cap 6 is fully fitted onto the outside of the core rod 4, the first wedge block 13 and the second wedge block 14 are in a staggered and snapped state, which allows for quick installation of the aluminum cap 6 and the steel foot 7. At the same time, when the aluminum cap 6 and the steel foot 7 move, they can drive the insert block 15 to be inserted between the arc plate 9 and the core rod 4, preventing the arc plate 9 from moving under force and improving the stability of the installation of the aluminum cap 6 and the steel foot 7. It is also sealed to the composite outer sleeve 2 through the second sealing ring 8. This device integrates the column-type composite insulator with lightning protection design. Its function is to divert the lightning current to the ground when lightning strikes the overhead insulated line, thereby protecting the overhead insulated line, improving the lightning resistance level of the transmission line, and reducing lightning accidents and tripping rates.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lightning arrester for use as an insulator, comprising a lightning arrester body (1), characterized in that: The surge arrester body (1) is provided with a composite jacket (2) on the outside. An insulator string (3) is fixedly connected to the outer end of the composite jacket (2). A core rod (4) is sleeved inside the composite jacket (2). A first sealing ring (5) is provided at the contact point between the core rod (4) and the composite jacket (2). An aluminum cap (6) is sleeved on the left end of the core rod (4). A second sealing ring (8) is provided at the contact point between the aluminum cap (6) and the composite jacket (2). A steel foot (7) is sleeved on the right end of the core rod (4). A snap-fit ​​mechanism is provided between the aluminum cap (6) and the core rod (4) and between the steel foot (7) and the core rod (4). The snap-fit ​​mechanism can fix the aluminum cap (6) and the steel foot (7) on the core rod (4).

2. A surge arrester for use as an insulator according to claim 1, characterized in that: The second sealing ring (8) has an annular cavity inside. The materials of the second sealing ring (8) and the first sealing ring (5) are HNBR hydrogenated nitrile rubber.

3. The arrester for use in the insulator according to claim 1, characterized by: The snap-fit ​​mechanism includes an arc-shaped plate (9), a connecting groove (10), a connecting block (11), a rubber pad (12), a first wedge block (13), a second wedge block (14), and an insert block (15). The core rod (4) has arc-shaped plates (9) on both the upper and lower sides corresponding to the aluminum cap (6) and the steel foot (7). A connecting groove (10) is opened at the outer end of the core rod (4) corresponding to the arc-shaped plate (9). A connecting block (11) is fixedly connected to one end of the arc-shaped plate (9) near the core rod (4). The connecting block (11) is located within the connecting groove (10). A rubber pad (12) is glued to one end of the connecting block (11) away from the arc plate (9). A plurality of first wedge blocks (13) are fixedly connected to the outer end of the arc plate (9) away from the core rod (4). A plurality of second wedge blocks (14) are fixedly connected to the inner wall of the aluminum cap (6) and the steel foot (7). The first wedge blocks (13) and the second wedge blocks (14) are staggered. An insert block (15) is fixedly connected to the inner wall of the aluminum cap (6) and the steel foot (7). The insert block (15) is located between the arc plate (9) and the core rod (4).

4. The arrester for use as an insulator according to claim 3, characterized by: The cross-section of the connecting groove (10) and the connecting block (11) is T-shaped, and the overall external dimensions of the connecting block (11) and the rubber pad (12) are adapted to the internal dimensions of the connecting groove (10).

5. The arrester for use as an insulator according to claim 3, characterized by: The thickness of the rubber pad (12) is greater than the maximum vertical length of the second wedge block (14).

6. A surge arrester for use as an insulator according to claim 3, characterized in that: The first wedge (13) and the second wedge (14) are both slope-shaped. The slope height of the first wedge (13) gradually increases from the mandrel (4) toward the composite jacket (2), and the slope height of the second wedge (14) gradually increases from the composite jacket (2) toward the mandrel (4). The end of the insert (15) near the arc plate (9) is inclined.

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