48results about How to "Effective isolation of contacts" patented technology

The invention relates to a method for manufacturing a high steel grade sulfur-resistant drill pipe by laser cladding. In the method, in the condition of inert gas insulating air, nickel-base alloy anti-corrosion material is clad on the inner and outer pipe walls of an S135 steel grade drill pipe with conventional properties by laser, a nickel-base alloy anti-corrosion layer is clad on the non-thread area of a joint, threads are processed on the thread conical surface of the joint after a nickel-base alloy anti-corrosion layer is clad on the thread conical surface of the joint, and the end part of a pipe body is oppositely connected with the joint through friction welding; the output power of the laser is 3.5-4.5kW; laser beam spot size is not more than Phi 3mm; defocusing amount is 25-35mm; laser beam scanning line speed is 6.5-7.5mm / s; the inclined angle between the laser beam and the long axis direction of the pipe body is 40-50 degree; and the delivery rate of cladding wire material is 15-20g / s. The drilling pipe reaches the property of the S135 steel grade drilling pipe by the APE Spec standard. The cladding layer can effectively prevent a base body from contacting natural gasto improve the H2S-resistant stress corrosion cracking performance.

A novel horizontal-type high-voltage insulator protection device belongs to the field of high-voltage circuit protection and is used for solving the problem of arc generation by a high-voltage line insulator and large power transmission loss due to rainwater. The protection device comprises an upper half protection mechanism, a conical protection cover, and multiple groups of rain shading assemblies, wherein the upper half protection mechanism is used for protecting an upper half part, the front end and the rear end of an insulator, the conical protection cover is arranged at the root of the rear end of the insulator, a wire of the insulator is arranged in the conical protection cover, and the multiple groups of rain shading assemblies are arranged at the lower half part of the insulator and are used for protecting the lower half part of the insulator. By the protection device, the insulator can be effectively prevented from being in contact with rainwater, two poles of the insulator are protected from being moistened by rain, a blue arc discharge phenomenon at the root of the high-voltage line insulator is avoided, a high-voltage line insulator is prevented from being broken down, and a device fault is prevented. The protection device has the advantages of simplicity in structure, time and labor saving and long service lifetime, and is simple and convenient to install, the insulation capability of an important suspension point of a high-voltage line is stronger, thus, the fault frequency of high-level voltage running circuit is effectively reduced, and the operation time under high strength is reduced.