| 摘要 |
PCT No. PCT/FI89/00207 Sec. 371 Date Jun. 25, 1990 Sec. 102(e) Date Jun. 25, 1990 PCT Filed Nov. 15, 1989 PCT Pub. No. WO90/05687 PCT Pub. Date May 31, 1990.The present invention concerns an apparatus for producing a water seal in a protective tube (16) of a submersed pump (15) of a gas cistern (10), on the lower end thereof being a bend (16a) or a tubular structure (16c) enabling the producing of a water seal. The apparatus comprises a chamber (30), which with two or several tubes (32,35) communicates with the top end of the protective tube (16), and valves (31,33,34,36) with the aid of which the filling of the chamber with water may be carried out in subsequent operational steps, whereby the gas contained in the chamber (30) simultaneously discharges from the chamber (30), and the forcing of the water enclosed in the chamber (30) into said protective tube (16) with the pressure of the gas prevailing therein, whereby, by carrying out said subsequent operational steps, the pressure of the gas of the protective tube (16) can be made to fall to the level of the atmospheric pressure. |
