Spiral double-pipe heat exchanger

Abstract

A spiral double-pipe heat exchanger belongs to the field of heat-exchanging apparatuses. A hot-working-medium inlet, a cold-working-medium collecting chamber and a cold-working-medium outlet are arranged on the upper end of a spiral double-pipe heat exchanger body; a hot-working-medium collecting cavity, a hot-working-medium outlet and a cold-working-medium inlet are arranged on the lower end of the heat exchanger body; the heat exchanger body is formed by a plurality of pipes which have different diameters and are sleeved with each other; two adjacent pipes are isolated by a spiral rib, so as to form a spiral channel and form separated cold / hot channels from the centre pipe to the outside; an inlet of a cold-hot working medium heat exchanging channel is configured into a hollow cone, and the outlet is respectively introduced into the upper and the lower collecting cavities by each conduit; the hot-working-medium inlet of the double-pipe heat exchanger is provided with a driving turbine; the cold-working-medium inlet of the double-pipe heat exchanger is provided with an impeller; and the turbine and the impeller are connected by a rotating shaft fixed in a central cylinder. The heat exchanger can fully use the exhaust gas of the combustion motor to drive the cooling airflow automatically, thereby enhancing the heat-exchanging strength; and the heat exchange coefficient of the spiral channel is enhanced by more than 100% compared with the common double-pipe heat exchanger.

Description

Technical field: [0001] The invention relates to heat transfer equipment, in particular to a type of spiral casing heat exchanger. Background technique: [0002] Heat exchangers are usually used to transfer heat from a high temperature gas or liquid medium to a low temperature gas or liquid medium. When the hot and cold mediums are in the same state and the heat transfer areas of the hot and cold sides are close, both the hot and cold fluids have comparable heat transfer coefficients, and the heat transfer efficiency of the heat exchanger is better. If the heat transfer process of the hot and cold medium is in phase state change, its heat transfer coefficient is higher, and the heat transfer coefficient on the side where the phase state does not change is lower. Generally, the thermal resistance of this side should be reduced; in addition, when the heat medium has some residual pressure There are no problems such as recycling and heat medium containing particulate impuritie...

AI Technical Summary

Problems solved by technology

If the heat transfer process of the hot and cold medium is in phase state change, its heat transfer coefficient is higher, and the heat transfer coefficient on the side where the phase state does not change is lower. Generally, the thermal resistance of this side should be reduced; in addition, when the heat medium has some residual pressure Can not be recycled and the heat medium contains particulate impurities, which cause some heat exchangers to block, the medium flow resistance is large, and the heat transfer coefficient drops greatly.

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