Heat accumulating type electric heater with heat accumulator formed by casting

Abstract

The invention discloses a heat accumulating type electric heater with a heat accumulator formed by casting. The electric heater comprises a outer shell body, wherein a grating cover is arranged abovethe outer shell body, a skirt base is arranged below the outer shell body, at least one fan is arranged at the bottom of the skirt base; the heat accumulator is arranged in the outer shell body, the heat accumulator is a cast-formed solid heat accumulating material, a plurality of air flow channels are uniformly arranged in the heat accumulator at intervals, the lower ends of the air flow channelscommunicate with the interior of the skirt base, the upper ends of the airflow channels communicate with the interior of the grating cover, and an electric heater is arranged between every two adjacent airflow channels. According to the heat accumulating type electric heater, the heat accumulator, the electric heater and the heat preservation layer are in a totally-closed structure and are isolated from outside air, so that metal oxidation can be prevented, the service life of related components is prolonged, the closed structure becomes a thermodynamic closed system, the heat exchange is carried out with the outside, no matter and mass exchange exists, zero emission of the system is achieved, the environment-friendly effect is achieved, the water and the water vapor or the particles cannot be immersed, and a relatively high safety protection grade is achieved.

Description

technical field [0001] The invention relates to the technical field of heat storage electric heaters, in particular to a heat storage electric heater in which a heat storage body is poured and formed. Background technique [0002] At present, the existing manufacturing structure of heat storage electric heaters in the market is mainly prefabricated heat storage bricks stacked into / or stacked into a heat storage body. The outer casing of the layer is a metal shell. The problems with this structure are: [0003] 1. The structural type produces excessive thermal resistance, which deteriorates heat transfer. [0004] Thermal resistance produces: [0005] ⑴Because the prefabricated regenerative brick has no electric heater structure, the electric heater floats in the regenerative rotor, and the shape of the electric heater is a round tube, which cannot fit perfectly with the plane of the regenerative rotor, leaving a Larger gaps and intervals, due to the small thermal conduct...

AI Technical Summary

Problems solved by technology

[0005] ⑴Because the prefabricated regenerative brick has no electric heater structure, the electric heater floats in the regenerative rotor, and the shape of the electric heater is a round tube, which cannot fit perfectly with the plane of the regenerative rotor, leaving a Large gaps and intervals, due to the low thermal conductivity of the air, resulting in a large air thermal resistance

[0010] (1) Due to the combined effect of the above three thermal resistances, the heat generated by the electric heater cannot be dissipated in time, resulting in a self-heating effect, which makes the electric heating tube work in an overheated state for a long time, so it burns out prematurely

[0011] ⑵Because most of the heat storage materials used are non-metallic, the thermal conductivity is small, which is a general rule. Because the thermal conductivity of the heat storage body is small, the thermal resistance increases, and it is difficult to input heat into the deep inside of the heat storage body, (deep inside the heat storage body It is also difficult to transfer the heat to the outer surface), superimposed with the above three thermal resistances, the temperature difference of the heat storage temperature increases, the maximum can reach more than 300 ° C, the average heat storage temperature is reduced, and the heat storage capacity is reduced by 1 / 3. Utilization reduced by 1 / 3

It is a common disadvantage of regenerative electric heating equipment with this structure

[0013] ⑷Constrained by overheating, the heating element is under protection for a long time, so that the power utilization rate is less than 50%

[0014] ⑸The heat transfer is out of control, the temperature field cannot be organized, or the thermal process design cannot be formed due to theoretical failure

[0015] 2. Open system forms pollution

It not only makes the control of thermal process complicated and difficult, but also the dust of heat storage materials and insulation materials, broken flocs, crumbs, and peculiar smells of needle felt fibers escape with the hot air flow and fill the heating room, deteriorating the indoor environment and air quality.

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