| 摘要 |
1. A system for raising and lowering a liner of a fluid bearing receptacle, said liner attached along its peripheral edge to said receptacle, said system including: a first baffle means adapted for connection to said receptacle in a manner so as to form a spillway which provides fluid communication between an outside surface of said liner and an inside surface of said receptacle, said liner being detached from said receptacle in the region of said baffle means and reattached along its peripheral edge to an upper edge of said baffle means, first means for supplying a gas to the outside surface of said liner; and second means for supplying a gas to said spillway, whereby, in use, when a fluid is held within said receptacle on the inside surface of said liner so as to hold said liner in a lining position with its outside surface in contact with the inside surface of said receptacle and said first baffle means, a gas can be passed through said first means to progressively lift said liner up and away from the inside surface of said receptacle thereby displacing fluid held on the inside surface of said liner to flow over the upper edge of said baffle means down said spillway and between the outside surface of said liner and the inside surface of said receptacle until substantially all of said fluid is so displaced, raising said liner to a covering position in which it covers said fluid, and a gas can be passed through said second means to lift said fluid up said spillway and over said upper edge of said baffle means onto the inside surface of said liner progressively lowering said liner back to said lining position. 2. A system according to claim 1 wherein said first means is in the form of a conduit or manifold having a length which extends along or near the upper edge of said baffle means. 3. A system according to claim 2 wherein said second means comprises a conduit or manifold having a length extending along or near a lower edge of said baffle means. 4. A system according to claim 3 wherein said first conduit or manifold is formed on a side of said baffle means adjacent the inside surface of said receptacle and said baffle means is provided with one or more openings to provide fluid communication between said conduit or manifold and said outside surface of said liner. 5. A system according to claim 4 wherein said baffle means is in the form of a plate shaped or otherwise configured to be spaced from a side wall of said receptacle. 6. A system according to claim 4 wherein said baffle means is in the form of one or more plates which extend across and down respective corners of said receptacle. 7. A system according to claim 5 further including said system further includes third means for allowing evacuation of gas entrapped between the outside surface of said liner and said fluid when said lineris in said raised position so that said liner, when in the covering position, can sit on said fluid. 8. A system according to claim 5 further including filter means for filtering fluid as it flows through said spillway. 9. A liftable liner system for a fluid bearing receptacle including: a flexible liner shaped to conform to an inside surface of said receptacle; first baffle means adapted for connection to said receptacle in a manner so as to form a spillway which provides fluid communication between an outside surface of said liner and an inside surface of said receptacle, said liner being attached along its peripheral edge to said receptacle and an upper edge of said first baffle means; first means for supplying a gas to the outside surface of said first baffle means; and, second means for supplying a gas to said spillway, whereby, in use, when a fluid is held within said receptacle on the inside surface of said liner so as to hold said liner in a lining position with its outside surface in contact with the inside surface of said receptacle and said first baffle means, a gas can be passed through said first means to progressively lift said liner up and away from the inside surface of said receptacle thereby displacing fluid held on the inside surface of said liner to flow over the upper edge of said baffle means down said spillway and between the outside surface of said liner and the inside surface of said receptacle until substantially all of said fluid is so displaced, raising said liner to a covering position in which it covers said fluid, and a gas can be passed through said second means to lift said fluid up said spillway and over said upper edge of said baffle means onto the inside surface of said liner progressively lowering said liner back to said lining position. 10. A system according to claim 9 wherein said first means is in the form of a conduit or manifold having a length which extends along or near the upper edge of said baffle means. 11. A system according to claim 10 wherein said second means comprises a conduit or manifold having a length extending along or near a lower edge of said baffle means. 12. A system according to claim 11 wherein said first conduit or manifold is formed on a side of said baffle means adjacent the inside surface of said receptacle and said baffle means is provided with one or more openings to provide fluid communication between said conduit or manifold and said outside surface of said liner. 13. A system according to claim 12 wherein said baffle means is in the form of a plate shaped or otherwise configured to be spaced from a side wall of said receptacle. |
