Spherical electric heater

Abstract

The invention discloses a spherical electric heater which comprises a spherical shell, an insulating sphere, an electric heating wire, a first leading-out rod and a second leading-out rod. An openingis formed in the spherical shell, the insulating and heat-insulating sphere is arranged in the spherical shell, a through hole is formed in the insulating and heat-insulating sphere, and the axis of the through hole coincides with the central axis of the insulating and heat-insulating sphere. One end of the electric heating wire is arranged in the through hole of the insulating heat-insulating sphere in a penetrating manner and is connected with the first leading-out rod after being led out from the opening in the spherical shell. The other end of the electric heating wire is spirally wound onthe surface of the insulating heat-insulating sphere, and is connected with the second leading-out rod after being led out through an opening in the spherical shell. Current is led into the electricheating wire through the lead-out rod. Electric energy is converted into heat energy through the electric heating wire wound on the insulating heat-insulating sphere, uniform heat is generated on thesurface of the spherical shell, the heat is transferred to a heated object through heat conduction, heat convection and heat radiation modes, and the purpose of uniform heating is achieved.

Description

technical field [0001] The invention belongs to the technical field of electric heaters, in particular to a spherical electric heater. Background technique [0002] Electric heater is a kind of internationally popular high-quality and long-life electric heating equipment. Electric heater is the process of converting electric energy into heat energy, which is used to heat up, keep warm or heat flowing liquid and gaseous state. The traditional electric heating tube is to put the electric heating wire in the seamless metal pipe (carbon steel pipe, titanium pipe, stainless steel pipe, copper pipe). It is made of crystalline magnesia with excellent thermal conductivity and insulation after shrinkage tube; due to the uneven thickness of magnesia powder filled in the gap, the surface temperature of the electric heating tube is uneven; at the same time, due to material limitations, the traditional electric heater cannot be made as Therefore, it cannot be used as a heat source for s...

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Problems solved by technology

[0003] Aiming at the deficiencies and defects existing in the prior art, the object of the present invention is to propose a spherical electric heater to solve the problem that due to the limitation of magnesium oxide powder in the prior art, it cannot be made into a spherical electric heater, and electric heating The technical problem of uneven temperature on the surface of the device

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