Abstract: A check valve device for a scroll machine is used to automatically maintain a unique flow direction of the working media. The check device is mounted on the neck of the non-orbiting scroll member of the scroll machine, in which the neck has an axle hole for defining a first passage for flowing the working media. The check valve includes a housing and a valve member. The housing has a through second passage, and couple with the neck in such a manner that a through passage is formed for connecting the first passage of the neck and the second passage of the housing. The valve member is located inside the second passage of the housing, and is formed as a plate with a pivot means to rotate along. While the scroll machine is in stop operation, the valve member is at a close position that the valve member can substantially block the flow of the working media inside the second passage.

Abstract: A back-pressure sealing system for a revolving compressor, comprising: a stator with an outlet on the upper side and a neck, surrounding the outlet; a separating part above the stator, separating a low-pressure zone around the stator from a high-pressure zone above the outlet and having a central opening around the neck; a connecting system between the upper and lower sides of the separating part; a first sealing device for sealing the neck of the stator against the central opening of the separating part; and a second sealing device for sealing the connecting system; wherein the back-pressure from the high-pressure zone is used to tighten the first and second sealing devices for a good sealing effect and thus good effectiveness of the compressor.

Abstract: An Oldham ring system for a rotary fluid compressor, comprising: a motor shaft; an eccentric shaft; a revolving part with two first gliding elements on its lower side; a stator; an Oldham ring, its upper side being provided with two second gliding elements fitting the two first gliding elements, and its lower side being provided with two third gliding elements for a perpendicular gliding movement; and a frame, on its perimeter being provided with two holders and with two fourth gliding elements in between that glide against said third gliding elements; wherein the characteristic is that the Oldham ring is, on the two opposite sides located next to the holders of the frame, provided with two straight shortcuts to reduce the width of the Oldham ring next to the holders; and wherein the first and second gliding elements as well as the third and fourth gliding elements each are provided with a groove in the gliding direction to provide for a flow path for lubricating oil.