| 摘要 |
PURPOSE: A suction pipe is provided to prevent cracks by dividing the strain-hardening portion and a stress-concentrated portion. CONSTITUTION: Many strain-hardening portions having a suction pipe(120) are formed in polygonal corners to form a polygonal looping portion(122). Stress-concentrated portions are formed in straight lines between the strain-hardening portions. The looping portions are formed in each square corner to form a square shape. Thereby cracks by vibration or shock are prevented.
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