Low pressure compound needle type insulator
Technical field
The utility model relates to a kind of low-voltage composite insulator for power circuit or electric railway circuit, particularly a kind of low pressure compound needle type insulator.
Background technology
Insulator is generally made up of the high insulator material of resistance, and its effect is that the not identical conductor of current potential is separated, and does not allow and has electric current to pass through between conductor, and electric current can be circulated by certain direction.At present, insulator is divided into ceramic insulator, glass insulator, composite insulator both at home and abroad.Pottery and the easy embrittlement of glass insulator, vulnerable to pollution, easily causes high pressure flashover and the cracked accident of fried bottle; Flexible poor, the easily embrittlement of the anti-folding of plug of common bar-shaped composite insulator.
But the insulator of above-mentioned three types all has electric simulation strength and mechanical strength is low, safeguard the shortcomings such as inconvenient, weight is large.
Utility model content
In view of this, the utility model is intended to propose a kind of electric simulation strength and mechanical strength low pressure compound needle type insulator high and lightweight, easy to maintenance.
The utility model provides a kind of low pressure compound needle type insulator, comprising: upper gold utensil, lower gold utensil, insulation mandrel and insulating coating; Wherein, described upper gold utensil is provided with wire casing; In described lower gold utensil, be provided with screw rod; Described upper gold utensil and described lower gold utensil are connected in the two ends of described insulation mandrel; And described insulating coating is sheathed on the outer surface of described insulation mandrel, this insulating coating is provided with the full skirt that two or more diameter orders diminish.
Further, in above-mentioned low pressure compound needle type insulator, the outer surface of described insulating coating is provided with the first full skirt and the second full skirt; Described the first full skirt and described the second full skirt arrange along described insulation mandrel interval; The diameter of described the first full skirt is greater than the diameter of described the second full skirt.
Further, in above-mentioned low pressure compound needle type insulator, described upper gold utensil is also provided with the metal bead of using for fixing cord.
Further, in above-mentioned low pressure compound needle type insulator, the length ratio of the diameter of the diameter of described the first full skirt and described the second full skirt is 4: 3.
Further, in above-mentioned low pressure compound needle type insulator, the diameter of described the first full skirt is 100mm; The diameter of described the second full skirt is 75mm.
Further, in above-mentioned low pressure compound needle type insulator, described insulating coating is the silastic material of one deck sulfuration.
The two ends of the utility model low pressure compound needle type insulator have upper gold utensil with wire casing and the lower gold utensil with screw rod, between upper gold utensil and lower gold utensil, it is an insulation mandrel that two gold utensils are coupled together, owing to vulcanizing one deck by small one and large one two insulating coatings that full skirt forms at insulation mandrel outer surface, electric simulation strength and the mechanical strength of the utility model low pressure compound needle type insulator are greater than similar porcelain insulator, and have withstand voltage height, the advantage such as non-maintaining, lightweight.
Brief description of the drawings
The accompanying drawing that forms a part of the present utility model is used to provide further understanding of the present utility model, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structural representation of the utility model low pressure compound needle type insulator preferred embodiment.
Description of reference numerals
Gold utensil on 1
2 times gold utensils
3 insulation mandrels
4 insulating coatings
5 metal beads
6 first full skirts
7 second full skirts
Embodiment
It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the utility model can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the utility model in detail.
With reference to Fig. 1.Fig. 1 is the structural representation of the utility model low pressure compound needle type insulator preferred embodiment.This embodiment is particularly useful for low pressure overhead power line.
The present embodiment low pressure compound needle type insulator comprises: upper gold utensil 1, lower gold utensil 2, insulation mandrel 3 and insulating coating 4; Wherein, upper gold utensil 1 is provided with wire casing; In lower gold utensil 2, be provided with screw rod; Upper gold utensil 1 and lower gold utensil 2 are connected in the two ends of insulation mandrel 3; And insulating coating 4 is arranged at the outer surface of insulation mandrel 3, comprise the first full skirt 6 and the second full skirt 7; The first full skirt 6 and the second full skirt 7 arrange along insulation mandrel 3 intervals; The diameter of the first full skirt 6 is greater than the diameter of the second full skirt 7.Insulating coating 4 is the silastic material of one deck sulfuration.Insulating coating 4 is sheathed on the outer surface of insulation mandrel 3.
In the present embodiment, the length ratio of the diameter of the diameter of the first full skirt 6 and the second full skirt 7 is 4: 3.Particularly, can adopt following size, the diameter of the first full skirt 6 is 100mm, and the diameter of the second full skirt 7 is 75mm.The diameter of the first full skirt 6 is greater than the diameter of the second full skirt 7 and can effectively protects the second full skirt 7 not drenched with rain, increase wet tolerance intensity.
Preferably, in the present embodiment, the insulation distance of top margin first full skirt 6 of insulating coating 4 is that 30mm, the first full skirt 6 are that 35mm, the second full skirt 7 are 30mm apart from insulating coating below apart from the insulation distance of the second full skirt 7, and the creepage distance of insulating coating 4 is 210mm.
In addition, upper gold utensil 1 is also provided with the metal bead 5 of using for fixing cord.When installation, first the nut of lower gold utensil 2 is turned on, screw rod is fixed on cross-arm, then, nut screwing clamping.Then,, by after pressing bonding jumper 5 to open, wire being put into the wire casing of upper gold utensil 1, metal bead 5 is compressed.
To sum up, can find out, the two ends of the present embodiment low pressure compound needle type insulator have upper gold utensil with wire casing 1 and the lower gold utensil 2 with screw rod, it between gold utensil 1 and gold utensil 2, is an insulation mandrel that two gold utensils are coupled together 3, due to the insulating coating 4 being formed by small one and large one two full skirts at insulation mandrel outer surface sulfuration one deck, electric simulation strength and the mechanical strength of the present embodiment low pressure compound needle type insulator are greater than similar porcelain insulator, and have withstand voltage height, the advantage such as non-maintaining, lightweight.
It should be noted that, although the present embodiment is provided with two full skirts, when actual enforcement, multiple full skirts can be set.Design is, press the distance between the length of insulation distance, full skirt and distance, each full skirt of insulating coating top margin topmost, and full skirt bottom and the distance of insulating coating bottom margin set full skirt number (generally spacing is not less than 30mm), according to the size of the size setting full skirt of creepage distance.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.