Fusing-type electric heating fusion tube fitting

Abstract

The invention relates to a fusing-type electric heating fusion tube fitting. The fusing-type electric heating fusion tube fitting comprises a tubular body. Binding posts and observation columns are arranged on the outer wall of the tubular body. A resistance wire spirally wound is embedded into the tube wall of the tubular body and electrically connected with the binding posts. An annular limiting boss is arranged on the inner wall of the tubular body. The resistance wire comprises a first resistance wire body and a second resistance wire body. The diameter of the first resistance wire body is larger than that of the second resistance wire body. The first resistance wire body is wound around the two sides of the annular limiting boss. The second resistance wire body is wound around the middle portion of the tubular body and corresponds to the annular limiting boss. By the adoption of the fusing-type electric heating fusion tube fitting, the resistance wire in the middle of the electric heating fusion tube fitting is changed to the thin wire, so that the current can be well controlled for fusing at a certain current, the resistance wire is disconnected, heating is stopped, and accordingly the problem that the current is too big is avoided.

Description

Technical field [0001] The invention belongs to the technical field of electrothermal fusion pipe fittings, and particularly relates to a fuse type electrothermal fusion pipe fitting. Background technique [0002] Electric melting pipe fittings are connected to the pipeline by heat melting. The heating source is the copper wire wound in the electric melting pipe fittings. The copper wire is energized through both ends, and the current passes through the copper wire to generate heat, thereby melting the pipes and pipe fittings. When the copper wire is energized, it needs to be adjusted according to the pipes of different calibers, and three stages of energization are required, that is, the first stage is preheated, the second stage is heated, and the third stage is hot melted. [0003] Different currents and voltages are required in different stages. Generally, there will be no problems in the first and second stages, but problems may occur in the third stage, such as the displacem...

AI Technical Summary

Problems solved by technology

[0003] Different currents and voltages are required at different stages. Generally, there will be no problems in the first and second stages, but problems may occur in the third stage, such as the displacement of the copper wire during the insertion of the pipe into the electric heating fitting. Lap with copper wire, resulting in excessive current, fast melting speed, excessive heat, too much material melted in the pipe fittings, increased pressure, and thus ejected from both ends of the pipe fittings, hurting the staff

This process takes only a few seconds, and the operator cannot respond in time most of the time

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