25-04-1984 дата публикации
Номер: EP0106287A1
A scroll type fluid displacement apparatus including a housing (10), a pair of scrolls (20,21) each comprising an end plate (201,211) and a spiral wrap (202, 212) projecting from one surface of the end plate (201.211). Both wraps (202,212) interfit to make a plurality of line contacts to define sealed off fluid pockets, and a driving mechanism (19, 14, 29) is operatively connected to one (21) of the scrolls to effect the orbital motion thereof relative to the other scroll (20) while rotation of the scroll (21) is prevented. The center portion of at least one of the wraps (202,212) has height higher portion than the remaining portion thereof. The center portion extends substantially from the inner end of the spiral element (202, 212) outwardly at least throughout the portions thereof which forms the center high pressure space when the two innermost pair of fluid pockets are merged into a single fluid pocket to form the high pressure space near the center of the scroll (20, 21). This construction prevents the abnormal wear between wrap (202, 212) and opposite end plate (211, 201) which is caused by axial slant of the scroll (20,21) or interior of extent parallelism between both scrolls (20, 21) without influence the sealing of the high pressure space.
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