| 摘要 |
本发明提供一种热泵机组200，系具备：循环路径210，供热媒循环；压缩机230，具有用以收容供给至压缩机构232、234之润滑油的收容空间R，并且将热媒予以绝热压缩以使之升温；冷凝器240，用以使热媒冷凝；膨胀阀260，用以使热媒减压膨胀；蒸发器220，用以使热媒气化；及控制部280，用以控制压缩机的驱动及膨胀阀的开度。控制部系构成为：当接收停止压缩机的压缩动作之内容的指示时，将膨胀阀的开度减小，以使收容于收容空间之润滑油之液面的高度，维持于预先设定之临限值以上的值，在将前述膨胀阀全部关闭之后，停止压缩机的动作。; a compressor (230) which includes a containing space (R) containing a lubricating oil to be supplied to a compression mechanism (232, 234) and which adiabatically compress the heating medium so as to increase a temperature of the heating medium; a condenser (240) which condenses the heating medium; an expansion valve (260) which decompresses and expands the heating medium; an evaporator (220) which evaporates the heating medium; a controller (280) which controls drive of the compressor and an opening degree of the expansion valve. The controller is configured, when receiving instructions that compression operation of the compressor is stopped, to decrease the opening degree of the expansion valve so that a level of a liquid surface of the lubricating oil contained in the containing space is maintained to be greater than or equal to a predetermined threshold value, and to stop operation of the compressor after completely closing the expansion valve. |
