| 摘要 |
A refrigeration system including a direct expansion evaporator with a substantially vertical header through which a fluid mixture of a refrigerant and oil is pumped, a compressor for compressing the refrigerant, and a suction tube in fluid communication with the header and the compressor through which a strea m of a first fluid mixture is drawn substantially in a first direction from th e header by the compressor. The first fluid mixture exerts a first fluid pressure in a second direction substantially opposite to the first direction A second fluid mixtu re is located in the header and subject to a second fluid pressure substantially greater than the first fluid pressure to create a pressure differential The system also includes an extraction apparatus with a passage subject to the pressure differential, through which passage the second fluid mixture is drawn into t he suction tube.
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