Humidity and heat resistant composite insulator

Abstract

The damp-heat-resistant composite insulator comprises a core rod, the middle part of the core rod is coated with an epoxy resin layer, so that an interface I is formed between the core rod and the epoxy resin layer, the upper ball socket fitting and the ball head fitting are pressed at two end parts of the core rod and the epoxy resin layer, a silicon rubber sheath is formed outside the epoxy resin layer, and an interface II is formed between the epoxy resin layer and the silicon rubber sheath. In a high-humidity and high-heat environment, moisture can be effectively prevented from entering the core rod, so that the occurrence of crisp, decay and fracture accidents of the composite insulator is reduced. The reliability of power supply is improved, and safe and stable operation of lines is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of power transmission and transformation, and relates to a moisture and heat resistant composite insulator. Background Art

[0002] The fracture accident of composite insulators will seriously affect the safe operation of the power grid. In a hot and humid environment, the silicone rubber composite insulator will cause aging of the core rod-sheath interface due to the influence of temperature, humidity, electric field and other factors. Moisture passes through the silicone rubber insulator sheath material and enters the interface area, causing core rod hydrolysis, local discharge and abnormal heating.

[0003] Moisture intrusion into the core rod is an important cause of composite insulator core rod fracture. When moisture intrudes into the composite insulator core rod, it is easy to cause electric field concentration, leading to internal discharge, causing high temperature heating of the composite insulator and core rod brittle deterioration. When the core rod decays at the interface, its conductivity increases, and local defects show conductor properties. Changes in the electrical parameters of the defective core rod will cause electric field strength distortion, further inducing local discharge. The core rod-sheath interface of the insulator plays a key role in the safe and stable operation of the insulator. Therefore, the sheath material and the interface performance of the sheath core rod are crucial to resist moisture intrusion. Summary of the invention

[0004] The purpose of the utility model is to overcome the above-mentioned deficiencies of the prior art and to provide a moisture and heat resistant composite insulator, thereby ensuring the reliability of power supply and ensuring safe and stable operation of the line.

[0005] The technical solution of the utility model is: a moisture and heat resistant composite insulator, comprising a core rod;

[0006] The middle part of the core rod is coated with an epoxy resin layer, so that interface one is formed between the core rod and the epoxy resin layer. Upper ball socket hardware and ball head hardware are pressed onto the two ends of the core rod and the epoxy resin layer. A silicone rubber sheath is molded outside the epoxy resin layer, so that interface two is formed between the epoxy resin layer and the silicone rubber sheath.

[0007] The two ends of the silicone rubber sheath are respectively covered outside the upper ball socket hardware and the ball head hardware.

[0008] An insulator shed is integrally formed outside the silicone rubber sheath.

[0009] The insulator shed comprises a large shed and a small shed, and the large shed and the small shed are arranged alternately and at intervals.

[0010] One end of the upper ball socket hardware is provided with a stepped hole 1, a large hole portion of the stepped hole is clearance-matched with the core rod, and a small hole portion of the stepped hole 1 is clearance-matched with the epoxy resin layer.

[0011] One end of the ball head hardware is provided with a stepped hole 2, the large hole portion of the stepped hole 2 is clearance-matched with the core rod, and the small hole portion of the stepped hole 2 is clearance-matched with the epoxy resin layer.

[0012] The thickness of the epoxy resin layer is 4 mm.

[0013] The use of epoxy resin material can effectively prevent water from invading the core rod. Water exists in two main forms in epoxy resin materials: in the form of free water in the micropores of the material or in the form of bound water that forms a chemical bond with the material matrix.

[0014] In a high humidity and heat environment, free water passes through the insulator sheath material and enters the interface area, causing core rod hydrolysis, partial discharge, abnormal heating and other adverse phenomena. The epoxy resin material contains aluminum hydroxide AL (OH) 3 Filler, due to aluminum hydroxide AL(OH) 3 It contains many hydroxyl groups, which can form hydrogen bonds with water molecules, thereby turning free water into bound water, reducing the free water in the material and making it saturated, thereby reducing water absorption and playing a role in preventing water seepage.

[0015] In a high humidity and heat environment, it can effectively prevent moisture from entering the core rod and thus reduce the occurrence of brittle and fracture accidents of composite insulators. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 for Figure 1 A partial enlarged view of

[0018] In the figure: 1. ball and socket fitting; 2. core rod; 3. epoxy resin; 4. silicone rubber sheath; 5. interface 1; 6. interface 2; 7. ball head fitting. DETAILED DESCRIPTION

[0019] See also Figure 2 , a 4mm epoxy resin layer 3 is coated on the middle of the core rod 2, so that an interface 1 5 is formed between the core rod 2 and the epoxy resin layer 3, a silicone rubber sheath 4 is formed on the outside of the epoxy resin layer 3, so that an interface 2 6 is formed between the epoxy resin layer 3 and the silicone rubber sheath 4, the core rod 2 and the epoxy resin layer 3 are pressed with an upper ball socket hardware 1 and a ball head hardware 7 at both ends, the two ends of the silicone rubber sheath 4 are respectively coated on the upper ball socket hardware 1 and the ball head hardware 7, and an insulator shed is integrally formed on the outside of the silicone rubber sheath 4, the insulator shed includes a large shed and a small shed, and the large shed and the small shed are alternately arranged. A stepped hole 2 is provided at one end of the ball head hardware 7, the large hole portion of the stepped hole 2 is gap-matched with the core rod 2, and the small hole portion of the stepped hole 2 is gap-matched with the epoxy resin layer 3.

[0020] See also Figure 1 , Figure 2 A stepped hole 1 is provided at one end of the upper ball socket fitting 1, a large hole portion of the stepped hole is clearance-matched with the core rod 2, and a small hole portion of the stepped hole 1 is clearance-matched with the epoxy resin layer 3;

[0021] The insulator assembly process of the utility model is as follows: a layer of epoxy resin layer 3 is covered on the outer surface of the core rod 2 to form an interface 1 5 (the interface between the core rod 2 and the epoxy resin layer 3), and then the ball socket hardware 1 and the ball head hardware 7 are installed for crimping and fixing, and then the crimped core rod 2 is placed in a mold for injection of a silicone rubber sheath 4 to form an interface 2 6 (the interface between the epoxy resin layer 3 and the silicone rubber sheath 4).

[0022] In a hot and humid environment, when moisture passes through the silicone rubber sheath 4 and reaches the interface 2 6, the moisture cannot penetrate due to the good waterproof performance of the epoxy resin, thereby protecting the interface 1 5 between the core rod 2 and the epoxy resin layer 3, so that the moisture does not affect the core rod. This heat and humidity resistant composite insulator ensures the safe and stable operation of the line.

Claims

1. A moisture and heat resistant composite insulator, characterized in that: comprising a mandrel (2); The middle part of the core rod (2) is coated with an epoxy resin layer (3), so that an interface (1) is formed between the core rod (2) and the epoxy resin layer (3), and an upper ball socket hardware (1) and a ball head hardware (7) are pressed onto the two ends of the core rod (2) and the epoxy resin layer (3), and a silicone rubber sheath (4) is molded on the outside of the epoxy resin layer (3), so that an interface (2) is formed between the epoxy resin layer (3) and the silicone rubber sheath (4).

2. The heat and moisture resistant composite insulator according to claim 1, characterized in that: The two ends of the silicone rubber sheath (4) are respectively covered on the outside of the upper ball socket hardware (1) and the ball head hardware (7).

3. A moisture-heat resistant composite insulator according to claim 1 or 2, characterized in that: An insulator shed is integrally formed outside the silicone rubber sheath (4).

4. The heat and moisture resistant composite insulator according to claim 3, characterized in that: The insulator shed comprises a large shed and a small shed, and the large shed and the small shed are arranged alternately and at intervals.

5. The heat and moisture resistant composite insulator according to claim 1, characterized in that: One end of the upper ball socket hardware (1) is provided with a stepped hole 1, a large hole portion of the stepped hole is clearance-matched with the core rod (2), and a small hole portion of the stepped hole 1 is clearance-matched with the epoxy resin layer (3).

6. The moisture-heat resistant composite insulator according to claim 1, characterized in that: One end of the ball head fitting (7) is provided with a stepped hole 2, a large hole portion of the stepped hole 2 is clearance-matched with the core rod (2), and a small hole portion of the stepped hole 2 is clearance-matched with the epoxy resin layer (3).

7. The moisture-heat resistant composite insulator according to claim 1, characterized in that: The thickness of the epoxy resin layer (3) is 4 mm.

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