| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent leakage of lubricant for a long time and to eliminate occurrence of abrasion, galling, or oxidative corrosion such as rust in a pressure swing adsorption type oxygen concentrating device provided with a flow circuit selector means with a rotary distributor valve assembly structure so as to maintain normal operation. SOLUTION: In this pressure swing adsorption type oxygen concentrating device for medical treatment, the flow circuit selector means is the rotary distributor valve assembly structure having a seal/shield, and provided with a bearing.</p> |
