| 摘要 |
A vacuum apparatus for industrial hide driers with multiple beds (2) include s a circuit with an open end (17) having arranged in a series: a vapor manifold (7) for each bed; a first condenser (8) inserted in each manifold; a first condensate separator (10) at the output of the various condensers (8); a main vacuum pump (16) to gradually reduce the absolute pressure in the circuit to a first upper value (P s,). A particular feature of the system consists of the fact that it has a secondar y aspiration device (19) which is arranged upstream of the main vacuum pump (16) to operate in series to this pump when the first value of t he absolute pressure (P s,) is reached, so as to further reduce the pressure of the circuit to a second lower value (P i). The upper value (Ps) of the absolute pressure is 40 to 100 mbar; the second lower value (P i) of the absolute pressure is 15 to 1 mbar. The device (19) is a high-capacity, low-head blower.
|
