Full-falling-film evaporator with double refrigerant distribution devices

Abstract

The invention discloses a full-falling-film evaporator with double refrigerant distribution devices. The full-falling-film evaporator comprises a barrel. A refrigerant inlet and a refrigerant outlet are formed in the top of the barrel. The upper distribution device is arranged on the inner upper portion of the barrel. Air baffles are arranged on the two sides of the top of the upper distribution device respectively and are respectively provided with a plurality of via holes communicated with the refrigerant outlet. An upper heat exchange tube bank is arranged below the upper distribution device. The lower distribution device is arranged below the upper heat exchange tube bank. A lower heat exchange tube bank is arranged below the lower distribution device. An oil accumulation zone is formed below the lower heat exchange tube bank and is provided with an oil return port and a liquid level sensor for controlling the liquid level. According to the full-falling-film evaporator, full-falling-film-type distribution of a refrigerant is achieved through the combination of the upper distribution device and the lower distribution device, film-type distribution of the refrigerant is formed on all heat exchange tubes, and therefore the heat exchange coefficient is improved; the lower heat exchange tube bank is prevented from being submerged in the refrigerant due to the arrangement of the liquid level sensor, the heat exchange coefficient is further improved, accordingly, the refrigerant charge and the heat exchange area are reduced, and energy saving and environment protection are achieved.

Description

technical field [0001] The invention relates to refrigeration equipment, in particular to a full falling film evaporator with double refrigerant distribution devices. Background technique [0002] At present, the evaporators used in high-efficiency cold water (heat pump) units in the refrigeration and air-conditioning industry mainly include flooded evaporators and falling film evaporators. Among them, compared with flooded evaporators, falling film evaporators It has the advantages of high heat exchange efficiency and less refrigerant charge. Therefore, falling film evaporators are more widely used. At present, the falling film evaporator used in the air-conditioning industry is generally a hybrid falling film evaporator in which the upper heat exchange tube group falling film evaporation and the lower heat exchange tube group flooded evaporation are mixed. This kind of falling film evaporator exists The following defects: 1) There is a high refrigerant liquid level at the...

AI Technical Summary

Problems solved by technology

At present, the falling film evaporator used in the air-conditioning industry is generally a hybrid falling film evaporator in which the upper heat exchange tube group falling film evaporation and the lower heat exchange tube group flooded evaporation are mixed. This kind of falling film evaporator exists The following defects: 1) There is a high refrigerant liquid level at the bottom of the existing falling film evaporator, and the oil content of the refrigerant at the bottom of the evaporator is high, resulting in a low heat transfer coefficient of the lower heat exchange tube group; 2) In addition, a large amount of refrigerant at the bottom of the evaporator The refrigerant liquid increases the refrigerant charge

Images