公开(公告)号：WO1987005974A1

公开(公告)日：1987-10-08

申请号：PCT/US1987000714

申请日：1987-04-02

Applicant: AMERICAN SIGMA, INC.

Inventor： AMERICAN SIGMA, INC. ,  DICKINSON, W., David ,  BAETZ, Charles, N.

IPC: F04B23/14

CPC classification number: E21B49/084 ,  E21B43/121 ,  F04B43/10

Abstract: A bladder pump (40) is suspended in a tubular air lift pump housing (14) which is closed at its lower end by a check valve (19), and which is connected at its upper end by a first conduit (25) and a separator (24) selectively to a supply of air under pressure. Two additional conduits (26) and (27) extend from the upper end of the bladder pump in either side-by-side relation, or coaxially one within the other, through the bore in the left pump housing and first conduit and the separator to control means. A first one of the two additional conduits is secured in the upper end of the bladder pump to communicate with an upper check valve chamber, which is connected by a perforated discharge tube (50) to a lower check valve chamber in the bladder pump. The discharge tube is surrounded by a flexible bladder (61), which is separated from the bladder pump housing by an air chamber (69) which communicates with the other of the two additional conduits to the control means. By supplying air under pressure through the first conduit, water which has entered the air lift housing through the check valve in its lower end, can be forced through the check valve (55) and bladder pump and first of the two additional conduits to a waste line, after which pumping air can be supplied intermittently to the second of the additional conduits to operate the bladder and pump water to a sampler through the first of the additional conduits.