A balance device for the axial force of a kilowatt-scale supercritical carbon dioxide turbine

Abstract

The invention provides a kilowatt level supercritical carbon dioxide turbine axial force balancing device, which includes a turbine and a motor coaxially connected to each other, the motor shaft of the motor runs through the turbine, and the left end of the turbine is provided with a turbine exhaust chamber , the left end of the turbine exhaust chamber is sequentially connected with the first pipe joint, connecting pipe, second pipe joint, sealing end cover and grate tooth seal, the left end of the grate tooth seal is connected with the motor, and the connecting pipe is provided with a decompression valve, the left end of the motor shaft extends into the turbine exhaust chamber. The invention transmits the force opposite to the axial force through the grate tooth plate fixed on the motor shaft and rotates with the motor shaft, thereby offsetting the axial force of the turbine, and has a simple structure and is convenient for disassembly and maintenance.

Description

technical field [0001] The invention relates to the technical field of engine waste heat recovery, and more specifically, relates to a kilowatt-level supercritical carbon dioxide turbine axial force balancing device. Background technique [0002] Among the recovery methods of engine waste heat, the power cycle using supercritical carbon dioxide as the working medium has received extensive attention due to its advantages such as high system efficiency, fast dynamic response, low cycle pollution, and low operating cost. Among them, the supercritical carbon dioxide turbine is exactly the cycle The key component of medium heat power conversion. In such waste heat recovery fields, the power of supercritical carbon dioxide turbines used is usually on the order of kilowatts. The turbine will generate axial force during the work process, and the axial force of the kilowatt-scale steam turbine can be offset by the thrust bearing, but for the kilowatt-scale supercritical carbon dioxi...

AI Technical Summary

Problems solved by technology

For kilowatt-scale supercritical carbon dioxide turbines, the impeller diameter and blade height are very small, and supercritical carbon dioxide has strong fluidity. If a balance hole is opened on the impeller, supercritical carbon dioxide can easily enter from the gap between the nozzle and the impeller. In the flow channel of the movable blade, considerable disturbance is generated to the mainstream flow, which causes the reduction of aerodynamic efficiency and working ability; if the balance is completely relied on the function of the balance piston, it may have an adverse effect on the structural design of the seal, and may also cause reduction in efficiency

In addition, the above two methods are complicated to disassemble and assemble, and the maintenance is difficult, which increases the maintenance cost

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