Devolatilization system for medium and low viscosity polymers

The devolatilization system comprises a polymer storage tank, a defoaming tank, a short-path distiller and an outer condenser, the polymer storage tank is connected with the defoaming tank through a pipeline and a delivery pump, the defoaming tank is connected with the short-path distiller, the short-path distiller is connected with a product receiving tank and a volatile matter receiving tank, and the outer condenser is connected with the product receiving tank and the volatile matter receiving tank. The short-path distiller is further provided with a steam outlet, the steam outlet is connected with a three-way pipe, the upper end of the three-way pipe is connected with an outer condenser, the lower end of the three-way pipe is connected with a volatile matter receiving tank, and the outer condenser and the upper end of the defoaming tank are connected with an exhaust pipe. A low-viscosity polymer is conveyed from a polymer storage tank to a preheater through a conveying pump, the preheated polymer enters a