| 摘要 |
The bottom of the machine has a groove (23) running around the well for sealing the strainer against the bottom, and for fixing the seal. The groove and the strainer edge have profiles so formed that at least two different sealing points (a,b) are obtained between the edge of the strainer and the groove at each intersection through the edge of the strainer and the groove at right-angles to the edge and groove longitudinal directions. |
