Throttling device for centrifugal heat pump unit

The utility model discloses a throttling device for a centrifugal heat pump unit. The throttling device is characterized by comprising an adjustable throttling valve (1), wherein the adjustable throttling valve (1) is communicated with a throttling orifice plate (2) by virtue of a pipeline; a first check valve (3), an electronic expansion valve (4) and a second check valve (5) are communicated by virtue of pipelines; after being communicated in series, the adjustable throttling valve (1) and the throttling orifice plate (2) are parallelly communicated with the first check valve (3), the electronic expansion valve (4) and the second check valve (5) by virtue of pipelines; a liquid level sensor (6) is connected with the electronic expansion valve (4) by virtue of a data line. The throttling device disclosed by the utility model is simple in structure, low in cost, convenient in use and long in service life, and can meet the working medium throttling requirement of the centrifugal heat pump unit during refrigera