| 摘要 |
An evaporator for eliminating water from liquids or for cooling liquids by direct expansion of a refrigerant fluid, comprising at least three frusto-conical jackets which include an outer jacket, an inner jacket, and at least one intermediate jacket. Said jackets are coaxially superimposed so as to define annular spaces therebetween. The ends of the jackets are closed except the small end of the internal jacket, which is open and communicates with a chamber defined inside the inner jacket. Inlet and outlet means for a first fluid are connected with respective ends of the annular space between the outer jacket and the adjacent intermediate jacket, and inlet and outlet means for a second fluid are connected respectively to the large end of the annular space between the inner jacket and the adjacent intermediate jacket. A helical element is arranged at least in the annular space between the inner jacket and the adjacent intermediate jacket and defines, with the adjacent conical surfaces of said annular space, a helical channel leading from the inlet to the outlet of said space. The first fluid is a heat donating or heat accepting fluid and the second fluid undergoes a change of state while it flows in the helical channel defined between the inner jacket and the adjacent intermediate jacket. In some applications of the apparatus, both fluids undergo a change of state.
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