A ground porcelain insulator for fixing a discharge gap

Abstract

The application discloses a ground wire porcelain insulator with fixed discharge gap and relates to the technical field of power transmission and distribution equipment.The ground wire porcelain insulator comprises a porcelain piece, an iron cap fixedly connected to the upper side of the porcelain piece, a steel foot fixedly connected to the lower side of the porcelain piece, a clamp sleeved with the outer side of the iron cap, an upper electrode installed on the outer side of the clamp through a bolt assembly, a lower electrode installed on the lower side of the steel foot through the same bolt assembly, a groove type upper side of the iron cap, a cylindrical pin and a split pin installed in the iron cap, two groups of protrusions fixedly connected to the side wall of the steel foot and a plurality of groups of gaskets adhered to the outer side of the steel foot.The recess on the outer wall of the iron cap not only considers the aesthetic property, but more importantly, the practicality.The reasonable depth and width of the recess ensure that the mechanical strength of the iron cap is not affected, and the design greatly enhances the overall stability and reliability of the insulator.

Description

Technical Field

[0001] This invention relates to the field of power transmission and distribution equipment technology, and in particular to a grounding porcelain insulator with a fixed discharge gap. Background Technology

[0002] The stability and security of the power system are crucial to my country's economic development. In the process of power transmission, the towers, as an important part of the transmission line, play a key protective role with their grounding porcelain insulators.

[0003] Grounding porcelain insulators are important devices in transmission lines to prevent direct lightning strikes on conductors. Their design fully considers the needs of lightning protection. A reasonable discharge gap is an important parameter in the design of grounding porcelain insulators. It can guide the lightning current through the ground wire to the ground in a timely and effective manner when lightning occurs, thereby avoiding the direct impact of the lightning current on the conductor and protecting the safety of the overhead line.

[0004] Specifically, when lightning strikes a tower or the nearby ground, it generates a very high potential on the tower. If the insulation strength between the tower and the conductor is insufficient to withstand this high potential difference, it may cause the conductor to discharge to the tower, leading to a line fault. The appropriate discharge gap of the grounding porcelain insulator can discharge in time under this high potential difference, introducing the lightning current into the grounding wire and safely guiding it into the earth, thereby protecting the conductor from damage. The grounding porcelain insulator also has good insulation performance and mechanical strength, and can operate stably for a long time in harsh natural environments. Its surface is usually made of special porcelain material, which has good anti-pollution, anti-aging and anti-electrolytic corrosion properties, and can effectively prevent the insulation performance from deteriorating due to environmental factors such as dirt and moisture. At the same time, its structural design also fully considers the requirements of mechanical strength and can withstand mechanical stress under harsh weather conditions such as wind pressure and icing.

[0005] In addition, grounding porcelain insulators typically face several problems after prolonged use: the bolts or nuts securing the upper electrode to the clamp may loosen, causing the upper electrode to rotate or fall off; the steel feet, designed with cylindrical rod diameters and glued heads, are assembled with the porcelain components using cement adhesive, which can expand or contract due to environmental factors, leading to loosening and rotation of the steel feet; and the lower electrode may rotate due to loosening of the bolt assembly. All of these problems affect the size of the discharge gap, preventing it from effectively protecting overhead lines and posing safety hazards. As a crucial protective device in transmission lines, the performance of grounding porcelain insulators directly impacts the safe and stable operation of the entire power system. Therefore, we need to continuously strengthen the research and development and production management of grounding porcelain insulators to improve their performance and quality, providing a more reliable guarantee for the safe and stable operation of the power system. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a grounding porcelain insulator with a fixed discharge gap.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A grounding porcelain insulator with a fixed discharge gap includes a porcelain component. An iron cap is fixedly connected to the upper side of the porcelain component, and a steel foot is fixedly connected to the lower side of the porcelain component. A clamp is fitted onto the outer side of the iron cap, and an upper electrode is installed on the outer side of the clamp via a bolt assembly. A lower electrode is installed on the lower side of the steel foot via the same bolt assembly. The upper side of the iron cap is groove-shaped, and a cylindrical pin and a cotter pin are installed inside the iron cap. Two sets of bosses are fixedly connected to the side wall of the steel foot, and multiple sets of washers are adhered to the outer side of the steel foot. A groove is formed on the outer side of the iron cap. The iron cap and the porcelain component, and the porcelain component and the steel foot are fixedly bonded together with cement adhesive.

[0009] Preferably, the outer side of the iron cap has a groove with a depth of 2mm and a width of 30.5mm. The groove is composed of four planes and four curved surfaces, with the planes and curved surfaces arranged alternately. The length of each plane is 28mm. Cylindrical protrusions are installed on the outer sides of two of the planes. The inner contour of the upper electrode is the same as the outer contour of the groove in the iron cap. The thickness of the upper electrode is 4mm, and the width of the upper electrode is 30mm. The length of the plane of the upper electrode is 28mm, and a circular hole is formed in this plane. The inner contour of the clamp is the same as the outer contour of the groove in the iron cap. The thickness of the clamp is 4mm, the width of the clamp is 30mm, and the length of the plane of the clamp is 28mm, and a circular hole is also formed in this plane.

[0010] Preferably, the connection between the lower electrode and the steel foot is a lock-shaped protrusion, and a deep hole is opened at the part where the steel foot and the lower electrode are connected, with the deep hole and the lock-shaped protrusion facing each other.

[0011] Preferably, the two bosses are arranged symmetrically, and the two bosses are cuboid in shape.

[0012] Preferably, the iron cap and the ceramic part, and the ceramic part and the steel foot are fixedly bonded together by cement adhesive.

[0013] Preferably, the bolt assembly includes two bolts, with a standard nut threaded onto the outer side of each bolt, and a nylon lock nut threaded onto the outer side of each bolt, the nylon lock nut being located outside the standard nut. A spring washer is fitted over each bolt, the spring washer being located inside the standard nut, and the standard nut being located between the spring washer and the nylon lock nut. A flat washer is also fitted over the outer side of each bolt, the flat washer being located inside the spring washer, and the spring washer being located between the flat washer and the standard nut.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The groove design on the outer wall of the iron cap not only takes into account aesthetics, but more importantly, its practicality. The reasonable depth and width of the groove ensure that the mechanical strength of the iron cap is not affected. This design greatly enhances the overall stability and reliability of the insulator. The locking mechanism uses a combination of a standard nut, a nylon anti-loosening nut, a flat washer and a spring washer to double-lock the upper and lower electrodes. This multi-layer locking method effectively prevents the electrodes from loosening after long-term use, ensures the constant discharge gap, and improves the safety of line operation.

[0016] 2. The alternating flat and curved surface structure and the protrusion design within the groove of the iron cap ensure that the upper electrode cannot rotate freely after being fixed. This design not only enhances the stability of the fixation but also avoids changes in the discharge gap caused by electrode rotation, further improving the performance of the insulator. The lock-core-shaped hole at the connection point between the steel foot and the lower electrode, in conjunction with the lock-core-shaped protrusion of the lower electrode, ensures that the lower electrode can be firmly fixed in the predetermined position after passing through the steel foot. This design not only facilitates installation and disassembly but also ensures the constancy and accuracy of the discharge gap. The two symmetrical cuboid protrusions on the steel foot adhesive head prevent the steel foot from rotating after being glued with cement adhesive. This design also enhances the overall stability of the insulator and prevents safety hazards caused by the rotation of the steel foot.

[0017] In summary, the design features and advantages of this invention work together to improve the overall performance of the grounding porcelain insulator, enabling it to maintain a constant discharge gap during use. This not only improves the safety of line operation but also greatly reduces potential safety hazards caused by insulator failure. Therefore, this invention has broad application prospects and promotional value in the power industry. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a ground wire porcelain insulator with a fixed discharge gap proposed in this invention;

[0019] Figure 2 This is a top view of the connection of a ground wire porcelain insulator with a fixed discharge gap proposed in this invention;

[0020] Figure 3 This is a schematic diagram of the iron cap structure in a ground wire porcelain insulator with a fixed discharge gap proposed in this invention;

[0021] Figure 4 This is a schematic diagram of the upper electrode structure in a ground wire porcelain insulator with a fixed discharge gap proposed in this invention.

[0022] Figure 5 This is a schematic diagram of the clamp structure in a ground wire porcelain insulator with a fixed discharge gap proposed in this invention;

[0023] Figure 6 This is a schematic diagram of the steel foot structure in a ground wire porcelain insulator with a fixed discharge gap proposed in this invention;

[0024] Figure 7 This is a schematic diagram of the structure of the lower electrode in a ground wire porcelain insulator with a fixed discharge gap proposed in this invention.

[0025] In the diagram: 1. Iron cap, 2. Washer, 3. Cement adhesive, 4. Ceramic part, 5. Steel foot, 6. Spring washer, 7. Flat washer, 8. Lower electrode, 9. Upper electrode, 10. Cylindrical pin, 11. Cotter pin, 12. Bolt, 13. Clamp, 14. Standard nut, 15. Nylon anti-loosening nut, 16. Boss. Detailed Implementation

[0026] Reference Figures 1-7 A grounding porcelain insulator with a fixed discharge gap includes a porcelain component 4. An iron cap 1 is fixedly connected to the upper side of the porcelain component 4, and a steel foot 5 is fixedly connected to the lower side of the porcelain component 4. A clamp 13 is sleeved on the outer side of the iron cap 1, and an upper electrode 9 is installed on the outer side of the clamp 13 via a bolt assembly. A lower electrode 8 is installed on the lower side of the steel foot 5 via the same bolt assembly. The upper side of the iron cap 1 is grooved, and a cylindrical pin 10 and a cotter pin 11 are installed inside the iron cap 1. Two sets of bosses 16 are fixedly connected to the side wall of the steel foot 5. Multiple sets of washers 2 are adhered to the outer side of the steel foot 5. A groove is formed on the outer side of the iron cap 1. The bolt assembly includes two bolts 12, and standard screws are threaded onto the outer sides of the two bolts 12. The outer sides of the two bolts 12 are threaded with nylon anti-loosening nuts 15, which are located outside the standard nut 14. Spring washers 6 are fitted over the two bolts 12, located inside the standard nut 14, and the standard nut 14 is located between the spring washers 6 and the nylon anti-loosening nuts 15. Flat washers 7 are also fitted over the two bolts 12, located inside the spring washers 6, and the spring washers 6 are located between the flat washers 7 and the standard nut 14. The iron cap 1 and the ceramic part 4, and the ceramic part 4 and the steel foot 5 are fixedly bonded together with cement adhesive 3. The assembled product needs to be cured to allow the cement adhesive 3 to fully solidify.

[0027] The outer side of the iron cap 1 has a groove with a depth of 2mm and a width of 30.5mm. The groove is composed of four planes and four curved surfaces, with the planes and curved surfaces arranged alternately. The length of each plane is 28mm. Two of the planes have cylindrical protrusions installed on their outer sides. The inner contour of the upper electrode 9 is the same as the outer contour of the groove in the iron cap 1. The upper electrode 9 has a thickness of 4mm and a width of 30mm. The plane length of the upper electrode 9 is 28mm, and a circular hole is formed in this plane. The inner contour of the clamp 13 is the same as the outer contour of the groove in the iron cap 1. The clamp 13 has a thickness of 4mm and a width of 30mm. The plane length of the clamp 13 is 28mm, and a circular hole is also formed in this plane.

[0028] The connection between the lower electrode 8 and the steel foot 5 is a lock-shaped protrusion. A deep hole is opened at the part where the steel foot 5 and the lower electrode 8 are connected, and the deep hole is opposite to the lock-shaped protrusion.

[0029] The two protrusions 16 are arranged symmetrically, and the two protrusions 16 are cuboid in shape.

[0030] In this invention, the iron cap 1 and the porcelain part 4 are glued together with cement adhesive 3. The steel foot 5 is glued together with the gasket 2 and the porcelain part 4 with cement adhesive 3. The iron cap 1, porcelain part 4 and steel foot 5 are tightly combined to form the main structure of the grounding porcelain insulator. The assembled product needs to be cured to allow the cement adhesive 3 to fully solidify. The upper end of the iron cap 1 is a groove-shaped connection, and the middle part needs to be connected to the hardware on the line with a conical pin 10 and a cotter pin 11. The discharge gap is determined by the distance between the upper electrode 9 and the lower electrode 8. The upper electrode 9 and the clamp 13 need to be fixed to the outer wall of the iron cap 1 with two bolts 12 and a standard nut 14, a nylon anti-loosening nut 15, a spring washer 6 and a flat washer 7. The lower electrode 8 needs to pass through the steel foot 5 and be fixed to the steel foot with a standard nut 14, a nylon anti-loosening nut 15, a spring washer 6 and a flat washer 7.

[0031] like Figure 2 As shown, the iron cap 1 is integrally formed by casting molten iron using a mold and sand core. The outer wall of the cast iron cap 1 has a groove with a depth of a = 2 mm and a width of h = 30.5 mm. The inner surface of the groove is set with four planes and four curved surfaces, and the planes and curved surfaces are arranged alternately. The length of the plane b is 28 mm. Two of the planes have a cylindrical protrusion, which is symmetrical about the center of the iron cap 1. After processing, the surface of the iron cap 1 needs to be hot-dip galvanized for corrosion protection. The groove width of the iron cap 1 is designed to be slightly wider than the upper electrode 9 and the clamp 13 to ensure that the upper electrode 9 and the clamp 13 can be completely fixed in the groove.

[0032] like Figure 3As shown, the upper electrode 9 is forged from steel. After machining, bending, drilling and other processing, the inner contour of the upper electrode 9 is consistent with the outer contour of the groove of the iron cap 1. The thickness of the upper electrode 9 is S=4mm, the width is H=30mm, and the length of the plane on the upper electrode 9 is B=28mm. There is a small round hole on the plane, which is used to match the protrusion on the iron cap 1 so that the upper electrode 9 cannot slip.

[0033] like Figure 4 As shown, the clamp 13 is made by forging. The inner contour of the clamp 13 is consistent with the outer contour of the groove of the iron cap 1. The thickness of the clamp 13 is X=4mm, the width is K=30mm, and the length of the plane on the clamp 13 is L=28mm. A small round hole is designed on the plane of the clamp 13, which needs to pass through the protrusion on the groove of the iron cap 1 and be fixed to the outer wall of the iron cap 1 by the upper electrode 9 through the bolt 12 group.

[0034] like Figure 5 As shown, the process steps for steel foot 5 are as follows: first, the material is cut using a punch press; then, the ball head is formed using a press; then, the edge is cut and the cone head is formed using a punch press; and the two bosses 16 at the lower end of the glue head are processed. The processed bosses 16 are symmetrical about the center of steel foot 5. The lock-shaped hole on steel foot 5 requires punching a hole in steel foot 5. First, a small hole is punched, and then a large hole is punched. The part where the large and small holes intersect forms the lock-shaped hole. The design of this small hole prevents the lower electrode 8 from rotating after passing through it.

[0035] like Figure 6 As shown, the lower electrode 8 is manufactured by integral forging and turning. The part connected to the steel foot 5 is first forged into a cylindrical shape and then turned on a lathe. The final shape is a lock core-shaped protrusion. The part that passes through the steel foot 5 is further turned into a thread shape and needs to be used in conjunction with the standard nut 14, the nylon anti-loosening nut 15, the flat washer 7, and the spring washer 6.

Claims

1. A ground wire porcelain insulator with a fixed discharge gap, comprising a porcelain component (4), characterized in that, The upper side of the ceramic piece (4) is fixedly connected to an iron cap (1), and the lower side of the ceramic piece (4) is fixedly connected to a steel foot (5). A clamp (13) is sleeved on the outer side of the iron cap (1). An upper electrode (9) is installed on the outer side of the clamp (13) by a bolt assembly. A lower electrode (8) is installed on the lower side of the steel foot (5) by the same bolt assembly. The upper side of the iron cap (1) is grooved. A cylindrical pin (10) and a cotter pin (11) are installed inside the iron cap (1). Two sets of bosses (16) are fixedly connected to the side wall of the steel foot (5). Multiple sets of gaskets (2) are glued to the outer side of the steel foot (5). A groove is opened on the outer side of the iron cap (1). The iron cap (1) and the ceramic piece (4), and the ceramic piece (4) and the steel foot (5) are fixedly glued together by cement adhesive (3).

2. A grounding porcelain insulator with a fixed discharge gap according to claim 1, characterized in that, The outer side of the iron cap (1) has a groove with a depth of 2 mm and a width of 30.5 mm. The groove is composed of four planes and four curved surfaces, with the planes and curved surfaces arranged alternately. The length of the plane is 28 mm. Two of the planes have cylindrical protrusions installed on their outer sides. The inner contour of the upper electrode (9) is the same as the outer contour of the groove of the iron cap (1). The thickness of the upper electrode (9) is 4 mm and the width of the upper electrode (9) is 30 mm. The length of the plane of the upper electrode (9) is 28 mm, and a round hole is opened in this plane. The inner contour of the clamp (13) is the same as the outer contour of the groove of the iron cap (1). The thickness of the clamp (13) is 4 mm and the width of the clamp (13) is 30 mm. The length of the plane of the clamp (13) is 28 mm, and a round hole is also opened in this plane.

3. A grounding porcelain insulator with a fixed discharge gap according to claim 1, characterized in that, The connection between the lower electrode (8) and the steel foot (5) is a lock-shaped protrusion. A deep hole is opened at the part where the steel foot (5) and the lower electrode (8) are connected. The deep hole and the lock-shaped protrusion are opposite to each other.

4. A ground wire porcelain insulator with a fixed discharge gap according to claim 1, characterized in that, The two protrusions (16) are arranged symmetrically, and the two protrusions (16) are cuboid in shape.

5. A grounding porcelain insulator with a fixed discharge gap according to claim 1, characterized in that, The bolt assembly includes two bolts (12), with a standard nut (14) threaded onto the outer side of each bolt (12). A nylon lock nut (15) is also threaded onto the outer side of each bolt (12), located outside the standard nut (14). A spring washer (6) is fitted onto the outer side of each bolt (12), located inside the standard nut (14) and between the spring washer (6) and the nylon lock nut (15). A flat washer (7) is also fitted onto the outer side of each bolt (12), located inside the spring washer (6) and between the spring washer (6) and the standard nut (14).

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