| 摘要 |
To reduce the working surface used and to produce a cost-effective design of a preferably mobile oil changing device with a large volume, especially for use with motor vehicle engines, the two pressure tanks 1, 2 for used oil and fresh oil are arranged one above the other and form a unit by means of a common intermediate floor 4. One, two or three floors 3, 4, 5 are penetrated by suction pressure pipes 6, 6a and are tightly welded to the latter. Transverse bores 7, 8 permit, by means of an air jet pump 9 with a lockable outlet, the generation of a vacuum and/or excess pressure in the lower tank, the introduction of fresh oil via the suction nozzle 10 and/or the evacuation of fresh oil via connection 11. Another system for filling and emptying the pressure tank can be carried out by means of a reversible oil pump 12, connection 13 acting as a suction and evacuation connection. Further combinations are produced by arranging more than two pressure tanks one above the other and by storing and delivering different liquid media. <IMAGE>
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