Rotary expansible chamber devices – With mechanical sealing – By changing working member or cylinder relative position
Patent
1991-06-27
1992-10-06
Bertsch, Richard A.
Rotary expansible chamber devices
With mechanical sealing
By changing working member or cylinder relative position
418204, 418127, F04C 114
Patent
active
051526832
ABSTRACT:
A dual piston rotary pump (10) having a housing (12) equipped with two ports (13a, 13b) to accommodate fluid flow through the housing (12) and having two generally cylindrical chambers (14a, 14b) within which cylindrical pistons (16a, 16b) are disposed. The chambers (14a, 14b) intersect to form a passage (15) therebetween and to allow the pistons (16a, 16b) to engage in tangential contact. Each piston (16a, 16b) rotates within its chamber (14a, 14b) in a direction counter to the direction of the other piston while maintaining tangential contact with the other piston and at least one piston is in tangential contact with its chamber wall. The pump includes variable offset transmission means (52a, 50a, 48a, 54a) to change the offset of the center of the piston from the center of rotation of the piston during the course of each rotation to allow the pistons (16a, 16b) to remain in mutual tangential contact at all times. The offset transmission means (52a, 50a, 48a, 54a) allows the pistons (16a, 16b) to move in semicircular, semi-elliptical paths. The pump may further include a reversible check valve (17), and each piston may include a counterbalance (122) to minimize vibrations.
REFERENCES:
patent: 20796 (1858-07-01), Holly
patent: 628906 (1899-07-01), Grindrod
patent: 799677 (1905-09-01), Schluter
patent: 1771863 (1930-07-01), Schmidt
patent: 1837714 (1931-12-01), Jaworowski
patent: 1900416 (1933-03-01), Izbicki
patent: 2453284 (1948-11-01), Tornborg
patent: 2698130 (1954-12-01), Mossin
patent: 3078807 (1963-02-01), Thompson
patent: 3726617 (1973-04-01), Daido
patent: 4753585 (1988-06-01), Thompson
Plant Engineering, Fluid Handling Pumps, E. Cunningham (Ed.).
Mechanical Engineer's Handbook, ed by L., Marks, pp. 1844-1845, McGraw-Hill Book Company, Inc. 1951.
Bertsch Richard A.
Cavanaugh David L.
Libert Victor E.
Spaeth Frederick A.
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