Coaxial heat exchanger, evaporator, condenser and refrigerating system

Abstract

The invention discloses a coaxial heat exchanger, an evaporator, a condenser and a refrigerating system. The coaxial heat exchanger comprises at least one connecting pipeline, at least one secondary refrigerant pipeline and a plurality of refrigerant pipelines, wherein the secondary refrigerant pipeline and the refrigerant pipelines are coaxially arranged, the refrigerant pipelines are arranged onthe inner side and the outer side of the secondary refrigerant pipeline respectively, and the refrigerant pipelines are connected through the connecting pipeline. A refrigerant enters the other refrigerant pipeline from one refrigerant pipeline and always exchanges heat with a secondary refrigerant in the secondary refrigerant pipeline, so that a mixed process instead of a single process in the prior art is realized; and through the strengthening effect of the mixed process of the coaxial heat exchanger, the flow velocity change of the refrigerant in the heat exchanger is increased, the turbulence level is increased, and the heat exchange coefficient and the heat exchange amount of the whole heat exchanger are increased.

Description

technical field [0001] The invention relates to the technical field of heat exchange of a refrigeration system, in particular to a coaxial heat exchanger, an evaporator, a condenser and a refrigeration system. Background technique [0002] The coaxial heat exchanger is composed of an inner tube and an outer tube. The hot and cold fluids flow in the inner tube and the annulus between the inner tube and the outer tube respectively for heat transfer. The coaxial heat exchanger has pressure resistance, shock resistance, and is not easy to deform. , not easy to block, smooth oil return and other advantages. [0003] The coaxial heat exchanger in the prior art is used as an evaporator, and the refrigerant has a single flow. During the heat exchange process of the refrigerant in the heat exchanger, the area of ​​the refrigerant side channel is the same before and after, but the density of the refrigerant in the first half is high, and the flow rate is low. Low heat transfer coeffi...

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Problems solved by technology

In the second half, the density is small, the flow rate is high, and the pressure drop is large, which does not change with the change of the refrigerant; as a condenser, the refrigerant is also a single flow, and the area of ​​the refrigerant side channel is the same before and after the refrigerant in the heat exchange process of the heat exchanger , but the refrigerant has low density, high flow velocity, and large pressure drop in the first half, and the second half has high density, low flow velocity, and low heat transfer coefficient, which does not change with the change of refrigerant, that is, the coaxial heat transfer in the prior art The heat exchanger is not adapted to the characteristics of the different states of the refrigerant, and the heat transfer effect of the heat exchanger cannot be fully utilized

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