Pipeline cleaning device and method for refrigerating apparatus

一种管道清洗装置，通过切换热泵回路(200)的四通切换阀(43)，将两个传输热交换器(25、26)交替地作为冷却器及加热器工作，使清洗回路(2)内的清洗制冷剂在气体管路(3)及液体管路(5)中循环。而且，在由该清洗制冷剂的循环进行的清洗过程中，当清洗制冷剂量不足时，打开电磁阀(SV3)，从制冷剂补充管路(72)将清洗制冷剂补充给对制冷剂储气瓶(71)中的制冷剂进行冷却工作的一个传输热交换器(25)或(26)。另一方面，当清洗制冷剂过多时，打开电磁阀(SV4)，使清洗制冷剂从制冷剂抽出管路(73)返回制冷剂储气瓶(71)。因此，能使清洗制冷剂量保持适当的量。 A piping cleaning system switches over a four-way switching valve 43 of a heat pump circuit 200 so that two transfer heat exchangers 25, 26 are operated alternately as a cooling device and a heating device, by which a cleaning refrigerant in a cleaning circuit 2 is circulated through a gas line 3 and a liquid line 5. During this cleaning operation with the cleaning refrigerant circulated, when the cleaning refrigerant runs short in amount, a solenoid valve SV3 is opened so that cleaning refrigerant of the refrigerant cylinder 71 is resupplied through a refrigerant resupply line 72 to either one of the transfer heat exchangers 25 or 26 that is cooling. On the other hand, when the cleaning refrigerant is excessive, a solenoid valve SV4 is opened so that the cleaning refrigerant is returned to the refrigerant cylinder 71 through a refrigerant bleed line 73. Thus, the amount of cleaning refrigerant can be maintained at an appropriate level.