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    3.
    发明专利
    未知

    公开(公告)号：DE1195427B

    公开(公告)日：1965-06-24

    申请号：DEB0063138

    申请日：1961-07-05

    Applicant: BASF AG

    Inventor： WEBER DIPL-ING HEINRICH ,  FRIEDENREICH DIPL-ING HEINRICH

    IPC: F04B25/00 ,  F04B25/02 ,  F04B27/02 ,  F04B37/12 ,  F04B39/04

    Abstract: 1,003,258. Piston and stuffing-box packing. BADISCH ANILIN & SODA-FABRIK A.G. July 4, 1962 [July 5, 1961], No. 25584/62. Headings F2B and F2T. In a multi-stage compressor comprising pistons 14, 15 and 16 having piston rings 17, 18 and 19 respectively, the high pressure piston 16 is additionally sealed by fixed U-packing rings 21, 22 (Fig. 2) housed in the high pressure cylinder 3 and the space 23 between the piston rings 19 and the first adjacent U-ring 21 is connected through a pipe 25 and a non-return valve 29 to the suction side of the high pressure cylinder 3 and the space 24 between the first and second U-rings is connected through a pipe 26 and a non-return valve 30 to the suction side of the intermediate pressure cylinder 2. The low, intermediate and high pressure cylinders 1, 2 and 3 respectively are fitted with suction valves 4 and 5, 8 and 10 and delivery valves 6 and 7, 9 and 11. Oil traps 27, 28 and cooling means 33 and 34 are provided in the pipes 25 and 26. In a modification for a twostage after-compressor, Fig. 3 (not shown), comprising coaxially opposed medium and high pressure cylinders, the high pressure and medium pressure piston rods are packed by five and three U-rings respectively and each side of the first U-ring of the high pressure rod packing is connected to the suction side of the high pressure cylinders whilst each side of the first U-ring of the medium pressure cylinder and the spaces between the second and third and between the third and fourth U-rings of the high pressure rod packing are connected to the suction side of the medium pressure cylinder. The piston rings may be made of or coated with plastic, for example, polyamides or polytetra-fluoroethylene.

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