| 摘要 |
A refrigerating system for an ice making machine includes an external equalizer expansion valve having a pressure equalizing tube connected to an exit of an evaporator tube. A pressure adjusting pipe which becomes conductive only in deicing cycle is branched from the pressure equalizing tube and connected to the discharge side of a compressor. An on-off valve is installed in the pressure adjusting pipe and controllably communicated with a hot gas valve in a hot gas pipe so that both the valves are opened and closed simultaneously. Namely, when the hot gas valve is opened for carrying out the deicing cycle operation, the on-off valve of the pressure adjusting pipe is opened, while the expansion valve remains closed. In an ice making operation cycle during which the hot gas valve is closed, the on-off valve of the pressure adjusting pipe is also closed. Thus, the expansion valve is optimally opened and closed for adjusting the amount of the coolant supply.
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