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Throttling back nitrogen feed protecting apparatus——PRC Utility Model Patent Publication

   The utility model relates to a throttle impact nitrogen protector, comprising a frame, which is characterized by further comprising a lower frame fixed on the frame, wherein the center of the lower frame is provided with a chamber of step type with a large upper and a small lower, the plane of the chamber is provided with an air intake groove whose arc length is corresponding to an angle of 180 to 270 degrees, the lower frame is provided with a hole communicated with the air intake groove and outer space, an upper flange is provided in the chamber and can rotate relative to the lower flange, which is provided with at least two air inlets at the position relative to the intake groove, a throttle distributor is connected fixedly with the upper flange and is provided with at least two air outlet grooves at the plane relative to the upper flange and communicated with the air inlets respectively, each air outlet groove is provided with at least two air outlets, a work bench is connected fixedly with the throttle distributor and is provided with at least four bench air outlets communicated with the air outlets. After the welding, the utility model stops impacting the copper pipe via nitrogen gas, to save nitrogen gas effectively, thereby reducing the production cost.