Pumps – Processes
Patent
1980-06-10
1983-02-15
Vrablik, John J.
Pumps
Processes
417288, 417304, 417310, 418 97, 418195, F04B 4902, F04C 1800, F04C 2300, F04C 2910
Patent
active
043738664
ABSTRACT:
A process to control the delivery of a single screw compressor comprising a screw meshing with two pinion wheels and rotatable inside a casing. A channel with obturating means is provided to connect the high pressure orifice pertaining to a one pinion-wheel and the low pressure orifice. Auxiliary orifices are arranged to connect the various zones of the casing exposed to pressure with the low pressure orifice, said auxiliary orifices being provided with obturating devices. Said orifices are sequentially opened to diminish the delivery, starting from the orifice located near the low pressure orifice. First, the orifices pertaining to the first pinion wheel are sequentially opened. Then, the channel connecting the high pressure orifice of the first pinion and the low pressure orifice is opened. Then, the auxiliary orifices pertaining to the second pinion are sequentially opened.
REFERENCES:
patent: 1634491 (1927-07-01), Cundy
patent: 3088658 (1963-05-01), Wagenius
patent: 3295752 (1967-01-01), Bellmer
patent: 3687572 (1972-08-01), Glanvall
patent: 3874828 (1975-04-01), Herschler et al.
patent: 4028016 (1977-06-01), Keijer
patent: 4042310 (1977-08-01), Schibbye et al.
patent: 4074957 (1978-02-01), Clarke et al.
Uniscrew Limited
Vrablik John J.
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