Throttling device and refrigeration system provided therewith

The utility model provides a throttling device and a refrigeration system provided therewith, wherein the throttling device comprises a throttling pipeline and a plurality of orifice plates which are sequentially arranged in the throttling pipeline, and liquid sight glass is arranged at an effluent side of each orifice plate. The throttling device can be used for observing gas-liquid state of refrigerant in the pipeline after throttling of the orifice plates through the liquid sight glass arranged at the effluent side of each orifice plate, including whether bubbles are produced, whether the density of the bubbles is reasonable, and the like, so as to very intuitively analyze whether the model selection of the orifice plates at various levels is appropriate, ensure the model selection of the multi-level orifice plates to be correct, guarantee the safe operation of the pipeline of the refrigeration system, effectively improve the design efficiency of the throttling device and the refrigeration system, and impr