Refrigerant distributor of falling film evaporator for water chilling unit

Abstract

A refrigerant distributor of a falling film evaporator for a water chilling unit comprises a refrigerant inlet, an upper porous top plate, a filter screen, a lower porous top plate, a porous bottom plate and side plates, wherein the filter screen is sandwiched between the upper porous top plate and the lower porous top plate, the upper porous bottom plate is positioned below the lower porous top plate, the upper porous top plate, the filter screen, the lower porous top plate, the porous bottom plate and the side plates jointly encircle to form a cavity, more than one distributing pore plate is arranged in the cavity, one end of the refrigerant inlet is provided with an opening after sequentially penetrating through the upper porous top plate, the filter screen and the lower porous top plate, and the opening is arranged above the distributing pore plates. The distributing pore plates include a primary distributing pore plate, the primary distributing pore plate is connected with the side plates and sequentially divides the cavity into two portions from top to bottom, and a first opening is formed between at least one lateral edge of the primary distributing pore plate and the corresponding side plate. The refrigerant distributor is simple and reasonable in structure, flexible in operation, low in manufacturing cost, fine in refrigerant gas and liquid separation effect and uniform in flow distribution.

Description

technical field [0001] The invention relates to a falling film evaporator, in particular to a refrigerant distributor for a falling film evaporator used in a chiller. Background technique [0002] At present, in large and medium-sized cities, about 30% to 40% of the city's power supply will be consumed during the peak summer electricity consumption of air conditioners, so it is imminent to implement energy conservation for air conditioners. In addition, with the active promotion of national energy conservation and emission reduction policies, as an air-conditioning company, how to reduce refrigerant charge and improve unit energy efficiency has become more and more important. [0003] In recent years, falling film evaporators used in seawater desalination and chemical industries have attracted widespread attention due to their excellent performance, and have begun to emerge in large chillers. Compared with dry evaporators and flooded evaporators , the falling film evaporato...

AI Technical Summary

Problems solved by technology

However, this form of dispenser requires high machining accuracy and high cost

[0008] Chinese Patent Document No. CN101052854A disclosed a "spray-shaped" refrigerant distributor on October 10, 2007. In this distributor, the refrigerant Spray on the evaporator tube with a certain pressure. Although the structure of the distributor is simple and the processing technology is not high, the design of the distributor is relatively complicated. It is necessary to ensure that each heat exchange tube is sprayed with refrigerant, and at the same time Ensure that the flow field of the entire evaporator will not be affected by high-speed injection and cause cross disorder

However, the structure of some components in the distributor (such as the longitudinally stretched distribution tube and the transversely stretched capillary) is relatively complicated, which increases the difficulty and cost of manufacturing and processing.

In addition, since the components of the distribution parts at all levels are closely connected together, the refrigerant passing through the distributor may still have a large kinetic energy and splash onto the evaporator tube, resulting in uneven distribution.

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