| 摘要 |
The purpose of the present invention is to prevent an extraction cap from getting detached under high-temperature environments while minimizing the force for attaching the extraction cap under low-temperature environments. A connecting means (7) for connecting a compressor (3) and an extraction cap (5) is composed of first and second connecting portions (7A, 7B). The first connecting portion (7A) has a hook pawl portions (28) at the tip end part of each of a pair of plate-shaped base portions (27) extending in a coupling direction from the extraction cap (5) through on both sides of an intake port portion (10), the hook pawl portions (28) having a triangular cross-sectional shape and including a locking surface (28S) projecting outwardly. The second connecting portion (7B) has an engaging surface (29S) that engages with the locking surfaces (28S). The angle ¸1 of the locking surfaces (28S) is different from the angle ¸2 of the engaging surfaces (29S); or a plate-shaped portion (40) which is a region from the rear end in the coupling direction, of the plate-shaped base portion (27) to the hook pawl portion (28), has a constant width portion (40A) and a constricted portion (40B) . |
