CN200965853Y - An insulation pull rod for high voltage breaker - Google Patents

Abstract

An insulating pull rod for a high-voltage circuit breaker, comprising an outer insert, an inner insert, and an insulating tube whose end is between the outer insert and the inner insert, and is provided on both the inner surface of the outer insert and the outer surface of the inner insert There are many grooves, and the inner and outer surfaces of the insulating tube that cooperate with the outer insert and the inner insert are all rough surfaces, and the matching gap between the insulating tube and the outer insert and between the insulating tube and the inner insert Filled with adhesive. This structure improves the bonding strength of the joint; after testing, the tensile strength of the insulating pull rod in the utility model is greater than 220kN.

Description

Insulated tie rods for high voltage circuit breakers

technical field

The utility model belongs to components on a high-voltage circuit breaker, in particular to an insulating pull rod on the high-voltage circuit breaker.

Background technique

The insulating tie rod is an important part of the circuit breaker, which has high requirements on its electrical and mechanical properties. The quality of the insulating tie rod directly affects the reliability of the circuit breaker and the safe operation of the power grid; therefore, the domestically produced 252kV gas Many of the circuit breaker products in the insulated enclosed combined electrical appliances (GIS) use foreign insulation tie rods. However, due to the differences between domestically produced circuit breakers and foreign products, domestic products require a lot of operating power, usually above 210kN , the strength of imported tie rods is generally lower than 180kN. In the tensile test, when the pulling force reaches 180kN, the joints and insulating tubes in the insulating tie rods will fall off, so the insulating tie rods produced abroad often have the technology that the tensile strength cannot reach the product design. Require.

Contents of the invention

The purpose of this utility model is to provide an insulating tie rod that can meet the tensile strength requirements of domestically produced circuit breaker products, and the tensile strength of the insulating tie rod is greater than or equal to 210kN.

The purpose of this utility model is achieved through the following scheme: the insulating pull rod used for high-voltage circuit breakers includes an outer insert, an inner insert, and an insulating tube whose end is between the outer insert and the inner insert, and the outer insert The inner surface of the part and the outer surface of the inner part are provided with multiple grooves, and the depth of the groove is 0.3mm ~ 0.7mm; Rough surface, the surface roughness Ra is 12.5-50μm, and the gap between the insulating tube and the outer insert and between the insulating tube and the inner insert is filled with adhesive.

The plurality of grooves provided on the inner surface of the outer insert and the outer surface of the inner insert are V-shaped grooves, which are parallel to each other, and the depth of the V-shaped grooves is 0.4mm-0.5mm.

The gap between the insulating tube and the outer insert and the inner insert is 0.1 mm to 0.3 mm.

The gap between the insulating tube and the outer insert and the inner insert is 0.2mm.

The adhesive is epoxy resin glue.

Both the inner surface of the outer insert and the outer surface of the inner insert of the insulating pull rod used for high-voltage circuit breakers are provided with multiple grooves, and the inner and outer surfaces of the insulating tube that cooperate with the outer insert and the inner insert They are all rough surfaces, and adhesives are filled in their matching gaps, so the bonding effect is improved. In addition, the utility model selects a better matching gap, which further improves the bonding strength of the joints; after testing , the tensile strength of the insulating tie rods in the utility model is greater than 220kN, and the products produced by us are adopted, which saves the enterprise's original purchase expenses from abroad and reduces the cost of high-voltage circuit breaker products.

Description of drawings

Fig. 1 is a sectional view of the internal structure of Embodiment 1

Fig. 2 is a sectional view of the internal structure of Embodiment 2

Figure 3 is a partial enlarged view of I in Figure 2

Detailed ways

Embodiment 1: This insulating tie rod for high-voltage circuit breaker includes an outer insert 1, an inner insert 2 placed in the outer insert 1, and an insulation between the outer insert 1 and the inner insert 2 at the end The pipe 3, the inner surface of the outer insert 1 and the outer surface of the inner insert 2 are all provided with a plurality of grooves 5, the shape of the groove 5 is semicircular, and the depth is 0.3 mm to 0.4 mm; The inner and outer surfaces of the insulating tube 3 that cooperate with the embedded part 2 are all rough surfaces, and the surface roughness Ra is 12.5 μm. The matching gap between them is 0.1 mm to 0.2 mm, and the gap is filled with adhesive 4, which uses functionalized polyethylene resin.

Embodiment 2: In the insulating tie rod used for high-voltage circuit breakers in this embodiment, the multiple grooves 5 provided on the inner surface of the outer insert 1 and the outer surface of the inner insert 2 are V-shaped grooves. Parallel to each other, the depth is 0.4mm ~ 0.6mm; the surface roughness Ra of the part that cooperates with the outer insert 1 and the inner insert 2 is 25μm or 50μm, between the insulating tube 3 and the outer insert 1 and between the insulating tube 3 and the The fit gap between the inserts 2 is 0.2 mm to 0.3 mm, and the gap is filled with an adhesive 4, which is epoxy resin glue. Other structures are the same as in Embodiment 1.

Embodiment 3: In the insulating pull rod used for high-voltage circuit breakers in this embodiment, the plurality of grooves 5 provided on the inner surface of the outer insert 1 and the outer surface of the inner insert 2 are rectangular in shape and adjacent to two One end of the groove intersects, and the depth of the groove is 0.6 mm to 0.7 mm; the surface roughness Ra of the part matched with the outer insert 1 and the inner insert 2 is 12.5 μm to 50 μm, and the insulating tube 3 and the outer insert 1 The gap between them and between the insulating tube 3 and the embedded part 2 is 0.1 mm to 0.3 mm, and the gap is filled with an adhesive 4, which uses functionalized epoxy resin structural adhesive. Other structures are the same as in Embodiment 1.

Claims (5)

1. An insulating pull rod for a high-voltage circuit breaker, comprising an outer insert (1), an inner insert (2), and an insulating tube whose end is between the outer insert (1) and the inner insert (2) ( 3), which is characterized in that: the inner surface of the outer insert (1) and the outer surface of the inner insert (2) are provided with multiple grooves, the depth of the grooves is 0.3mm-0.7mm; and the outer insert ( 1) The inner and outer surfaces of the insulating tube (3) mating with the embedded part (2) are all roughened surfaces, the surface roughness Ra is 12.5-50 μm, the distance between the insulating tube (3) and the outer insert (1) Adhesive is filled in the matching gap between the insulating tube (3) and the inlay (2). 2. The insulating pull rod for high-voltage circuit breakers according to claim 1, characterized in that: the inner surface of the outer insert (1) and the outer surface of the inner insert (2) are provided with a plurality of grooves It is a V-shaped groove, they are parallel to each other, and the depth of the V-shaped groove is 0.4mm-0.5mm. 3. The insulating pull rod for high-voltage circuit breakers according to claim 1 or 2, characterized in that: the matching gap between the insulating tube (3) and the outer insert (1) and inner insert (2) is 0.1 mm ~ 0.3mm. 4. The insulating tie rod for high-voltage circuit breaker according to claim 3, characterized in that the matching gap between the insulating tube (3) and the outer insert (1) and inner insert (2) is 0.2mm. 5. The insulating tie rod for high voltage circuit breaker according to claim 4, characterized in that said adhesive is epoxy resin glue.

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