| 摘要 |
A pump unit (10) for emulsifying air into an ice cream mixture comprises a first body (14) and a second body (16) provided with respective first and second cylindrical cavities (20, 22), each having longitudinal axes (20a, 22a) placed parallel to the axis of the other cavity. A cylinder head (18) is provided with cavities (50, 52) located as respective extensions of the cavities (20, 22) of said first and second bodies (14, 16). Both the first cavity (20) and the second cavity (22) comprise a guide portion provided with two guides (28, 30, 36, 38) made of plastic material and extending up to an intermediate point of the respective cavities (20, 22). A product working chamber can extend from said intermediate point up to the respective bottoms (50a, 52a) of the cavities (50, 52) bored within the cylinder head (18).
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