Pole coil annealing process and annealing furnace used by same

Abstract

The invention discloses a pole coil annealing process and an annealing furnace used by the same. The process comprises the following steps that placing a cleaned pole coil into a furnace tank of the pole coil annealing furnace, covering the tank with a furnace cover, aligning double packings for sealing, tightening a tensioning screw rod, feeding nitrogen in, completely removing oxygen in the furnace tank, carrying out heating, determining the temperature according to the specifications of the pole coil and the hardness of a wound copper bar, closing the furnace after maintaining the pressure,and lifting the furnace tank out of the furnace. The annealing furnace comprises the outer furnace tank, the furnace cover and an inner furnace mounting mechanism, wherein a heat-resistant iron plateis fixedly mounted on the inner surface of the outer furnace tank, light refractory bricks are attached to the inner wall of the heat-resistant iron plate, a U-shaped heating pipe is arranged on theinner sides of the light refractory bricks, a second U-shaped heating tube connector is integrally arranged at the lower end of the U-shaped heating tube, a high-temperature porcelain tube is fixedlyinstalled on the upper surfaces of the light refractory bricks, and the inner furnace mounting mechanism is located inside the U-shaped heating tube. Oxygen-free annealing can be implemented, oxide skin is prevented from being formed on the coil, the labor intensity is reduced, and operation conditions are improved.

Description

technical field [0001] The invention relates to the technical field of hydroelectric power generation, in particular to a magnetic pole coil annealing process and an annealing furnace used. Background technique [0002] During the production and manufacture of hydroelectric generators, the magnetic pole coils need to be annealed before use. Annealing is a metal heat treatment process, which refers to slowly heating the metal to a certain temperature, keeping it for a sufficient time, and then cooling it at an appropriate speed. Hardness, improving machinability. [0003] The existing magnetic pole coil annealing process has always used aerobic annealing. Aerobic annealing will produce scale on the surface of the copper wire, which will hinder the firm bonding between the copper wire and the insulation. Therefore, pickling treatment not only reduces the cross-section of the copper wire 5%~8%, and the environmental pollution is very serious, the height of the magnetic pole co...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a magnetic pole coil annealing process, to solve the problem that the general magnetic pole coil annealing process proposed in the above-mentioned background technology always adopts aerobic annealing, and aerobic annealing will produce scale on the surface of copper wire, hindering the connection between copper wire and insulation Strong bonding, so the pickling treatment not only reduces the cross section of the copper wire by 5%~8%, but also causes serious environmental pollution. The height of the magnetic pole coil is inconsistent, which affects the roundness of the rotor assembly. The efficiency is greatly reduced and the problem of increasing manufacturing costs

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