An apparatus (100) for collecting and purifying a refrigerant fluid in air conditioning systems, comprising a first tubular body (110), used as evaporator and separator of impurities of refrigerant (130) coming from a refrigerant circuit (50), through ducts (51) and (52), and a second tubular body (104) used for separating the fluid (130) from the oil (131) entrained during a compression step. First tubular body (110) and second tubular body (104) are arranged between a top distribution flange (101) and a bottom distribution flange (106). In said flanges a plurality of channels are made, which form portions of the circuit for refrigerant (130), as well as are used for other functions and for other fluids flowing in the whole purifying machine that includes apparatus (100) same. Refrigerant (130) contained in tubular body (110) evaporates by the heat of both a coil tube exchanger (111), which is located inside tubular body (110), and a portion of flange (106), which is located under tubular body (110). Top and bottom distribution flanges have the task of holding the two tubular bodies (110) and (104); defining the channels (120) and providing a heating channel (122) at the base of evaporator (110). The assembling and testing steps of the apparatus are much quicker and easier than in the prior art, reducing the risk of leakage. The apparatus is compact and can be made in a simple and not much expensive way.
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