Riser spiral-flow type falling-film evaporator for refrigerating air conditioner

Abstract

The invention discloses a riser spiral-flow type falling-film evaporator for a refrigerating air conditioner. The riser spiral-flow type falling-film evaporator comprises a shell, a refrigerant steam conveying pipe bundle, a falling-film evaporation pipe bundle, a damping hole plate and a spiral baffle plate, wherein the refrigerant steam conveying pipe bundle is arranged in the center in the shell and along the circumferential direction of the inner all of the shell, the falling-film evaporation pipe bundle is surrounded by the refrigerant steam conveying pipe bundle, the refrigerant steam conveying pipe bundle and the falling-film evaporation pipe bundle are both vertically arranged inside the shell, the upper part of an inlet of the falling-film evaporation pipe bundle is horizontally provided with the damping hole plate, the spiral baffle plate is fixed inside the shell and spirally arranged along a vertical direction, and is provided with through holes allowing the refrigerant steam conveying pipe bundle and the falling-film evaporation pipe bundle to pass through, an ejector is arranged between a refrigerant outlet pipe and a refrigerant inlet pipe, the inlet of the falling-film evaporation pipe bundle is provided with a flow guiding nozzle which has an outer diameter smaller than the inner diameter of the falling-film evaporation pipe bundle and is sealed at two ends, and the flow guiding nozzle is provided with a circular ring with three chutes formed along a circumferential direction uniformly. The riser spiral-flow type falling-film evaporator has the characteristics of small heat transfer temperature difference, high heat transfer coefficient, large evaporative power of unit area capable of preventing dry evaporation, low manufacture cost, less liquid holdup, small floor area and high safety.

Description

technical field [0001] The invention belongs to the technical field of refrigeration and air conditioning, and relates to a vertical tube falling film evaporator, in particular to a vertical tube swirl type falling film evaporator for refrigeration and air conditioning. Background technique [0002] With the rapid development of my country's national economy, the demand for large and medium-sized refrigeration and air-conditioning devices is increasing day by day. As a large and medium-sized refrigeration and air-conditioning device, the technical level of cold (hot) water units has been continuously improved, and the variety and output have continued to increase. In water chillers, such as centrifugal and screw chillers, the evaporator is a key heat exchange equipment in the system; the previous types of evaporators are mainly flooded evaporators and dry evaporators, of which flooded There are many applications. In recent years, under the background of the development nee...

AI Technical Summary

Problems solved by technology

However, since the application of the horizontal tube falling film evaporator in the refrigeration system is still in the exploratory stage, there are still many technical problems to be solved, such as the structural form of the liquid distributor to achieve uniform liquid distribution and the optimal design of the geometric arrangement of the evaporator tubes , the problem of dry evaporation caused by insufficient refrigerant flow, the influence of the structure of the outer surface of the evaporation tube on heat transfer, and the influence of refrigerant airflow on liquid film disturbance, etc.

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