Radial flow type turbo expander structure

Abstract

A radial flow type turbo expander structure comprises an air intake pipe, a static wheel disc, a flow guide cone, an impeller, a rotating shaft, a movable impeller cover and an exhaust flow guide ring. The air intake pipe is connected with the back face of the static wheel disc, a plurality of static blades arranged at intervals in the circumferential direction are arranged on the front face of the static wheel disc and surround a center through hole of the static wheel disc, and a nozzle is formed by a gap between every two adjacent static blades. The bottom of the flow guide cone is connected with the tops of the multiple static blades; the impeller sleeves outside the rotating shaft and is connected with the rotating shaft; a plurality of moving blades arranged at intervals in the circumferential direction are arranged on the front surface of the impeller; and the movable impeller cover is annular, and the bottom face of the movable impeller cover is connected with the tops of the multiple movable blades. The multiple moving blades surround the multiple nozzles; and the exhaust flow guide ring is arranged around the impeller and is opposite to the static wheel disc, and an annular gap between the exhaust flow guide ring and the static wheel disc forms an exhaust channel. When the radial flow type turbo expander structure works, the flow direction of internal working medium gas is centrifugal runoff, and the radial flow type turbo expander structure is efficient, reliable and compact in structure.

Description

technical field [0001] The invention relates to turbomachine technology. Background technique [0002] As a key component in a power cycle, the turbine is also very important for its research. At present, turbines are mainly divided into axial flow turbines and radial flow turbines. Axial flow turbines are generally designed as multi-stage, with large flow and large output power. However, due to the different linear speeds of rotation at different radii, the blades are generally long and twisted, and the reaction rate and speed ratio change rapidly along the blade height, so the optimal speed ratio cannot be maintained all the time. Radial turbines are divided into two categories: centrifugal and centripetal. The shape of the impeller of the centripetal turbine is similar to that of the impeller of the semi-open centrifugal compressor. The blades on the impeller are composed of radial straight blades and rotating guide blades at the outlet. , has good strength and rigidit...

AI Technical Summary

Problems solved by technology

However, due to the different linear speeds of rotation at different radii, the blades are generally long and twisted, and the reaction rate and speed ratio change rapidly along the blade height, so it cannot always be in the best speed ratio state.

Radial turbines are divided into two categories: centrifugal and centripetal. The shape of the impeller of the centripetal turbine is similar to that of the impeller of the semi-open centrifugal compressor. The blades on the impeller are composed of radial straight blades and rotating guide blades at the outlet. , has good strength and rigidity; its disadvantage is that the speed is high, and a reducer with a relatively large speed ratio is often required at the output end of the turbine; it is generally designed as a single-stage, the enthalpy drop is large, and the blade height changes drastically in the flow direction , the flow rate is limited, the aerodynamics and geometry are incompatible, it can only be used for small flow rates, and the shaft power is within 1MW

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