Spiral electric heating pipe efficient gas heater

Abstract

The invention provides a gas heater with a spiral efficient electric heating pipe. The gas heater comprises an outer shell, an inner shell and a plurality of layers of tubular resistance elements which are coaxially arranged, wherein each layer of tubular resistance element is a spiral coil-shaped resistance element formed by spirally ascending a tubular heating element, the upper end and the lower end of each layer of tubular resistance element are sequentially connected end to end in series, and the lower ends of a first-layer tubular resistance element positioned on the outermost layer anda second-layer resistance element adjacent to the first-layer tubular resistance element are connected with electrodes respectively; to-be-heated gas flows downwards from a gas outlet to an inner cavity of a lower sealing cover along a gas inlet channel, is heated by first gas outlet channels of inner cavities of the multiple layers of tubular resistance elements and a second gas outlet channel ofan inner cavity of the inner shell and flows out from a gas outlet of an upper sealing cover, and the gas is heated inside and outside the multiple layers of tubular resistance elements at the same time, so that the total power is high, a heating channel is long, the heating area is large, and the heat utilization rate is high.

Description

technical field [0001] The invention belongs to the technical field of electric heating equipment manufacturing, and in particular relates to a high-efficiency gas heater with a spiral electric heating tube. Background technique [0002] The high-efficiency gas heater in the prior art is coaxially provided with an outer shell and an inner shell, and then a linear tubular heating element is arranged inside the inner shell. Although the heat exchange contact area can be increased to a certain extent, the gas to be heated can be directly circulated. After the linear tubular heating element, there is no filtering deceleration measure, the gas circulation speed is fast, the heat exchange contact time is short, the effect of improving the heating efficiency is not obvious, the gas circulation speed is fast, and the heat circulation and dissipation speed is increased on the other hand; the gas From the air inlet to the air outlet in a straight line, the contact area with the heatin...

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Problems solved by technology

[0002] The high-efficiency gas heater in the prior art is coaxially provided with an outer shell and an inner shell, and then a linear tubular heating element is arranged inside the inner shell. Although the heat exchange contact area can be increased to a certain extent, the gas to be heated can be directly circulated. After the linear tubular heating element, there is no filtering deceleration measure, the gas circulation speed is fast, the heat exchange contact time is short, the effect of improving the heating efficiency is not obvious, the gas circulation speed is fast, and the heat circulation and dissipation speed is increased on the other hand; the gas From the air inlet to the air outlet in a straight line, the contact area with the heating element is small, and the heating effect is not improved; and the internal space of the inner shell is limited, the number of installed resistance elements is also limited, and the total power is also limited. The working efficiency of the heater is not high, the improvement of the gas heating effect is not obvious, and the overall working efficiency is not good

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