| 摘要 |
PURPOSE:To minimize leakages from both elements by a method wherein the logical displacement amount of an auxiliary compression element is designed so as to be 0.5- 1.5 times of the same amount of a main compression element and both of the elements are connected to increase the pressure of refrigerating machine oil in a delivery chamber for the main compression element upon controlling the capacity of the cycle. CONSTITUTION:In order not to reduce the coefficient of performance of the refrigerating cycle, the amount of logical displacement of the auxiliary compression element 3A is designed so as to be 0.5-1.5 times of the amount of displacement of the main compression element 2A. When the capacity is controlled, a bypass controlling two-way valve 34 is opened, an enclosed type compressor 1A is operated under a condition that said valve 34 is being opened, and refrigerant, flowed out of the auxiliary compression element 3A, is introduced into the suction pipe 12A of the main compression element 2A through a bypass path 33 and said valve 34. The delivery chamber of the main compression element 2A is a chamber 15, therefore, the pressure in the chamber 15 becomes higher than the pressure chambers of any other compression elements. Accordingly, the refrigerating machine oil is impregnated into all compression elements to seal them and leakages from both of the elements 2A, 3A may be minimized. |
