A centripetal turbine device with vibration damping and sealing structure

Abstract

A centripetal turbine device with vibration damping and sealing structure. When working, the working fluid first enters the centripetal turbine device from the intake volute, and then enters the nozzle ring. The pressure of the high-temperature and high-pressure working fluid gradually decreases. The flow rate gradually increases, and the working fluid at the nozzle ring outlet enters from the impeller inlet, expands and performs work in the impeller, and the pressure and temperature gradually decrease. The working fluid in the impeller first passes through the closed flow channel formed by the blade inlet shroud and the hub. Then it reaches the middle part of the centripetal turbine impeller blade and continues to expand and perform work. Finally, it passes through the closed flow channel formed by the blade outlet shroud and the hub. The low-pressure and low-temperature working fluid is discharged from the centripetal turbine device through the outlet flow channel. By adopting the shroud structure at the blade inlet and outlet and cooperating with the brush seal between the wheel cover and the impeller blade, the present invention greatly improves the rigidity, reduces the vibration response and ensures the operation safety, and at the same time improves the efficiency of the centripetal turbine device. Pneumatic efficiency has important engineering significance and broad application prospects.

Description

technical field [0001] The invention relates to an impeller mechanical device, in particular to a centripetal turbine device with a vibration damping and sealing structure. Background technique [0002] Turbo machinery is a kind of power equipment with continuous rotating blades as the main body, which can realize the energy conversion between fluid working medium and shaft power, including steam turbines, gas turbines and turbo compressors, etc. Its production level is measured by a country One of the most important indicators of overall industrial strength. According to the flow direction of the working medium, the impeller machinery can be divided into radial flow, radial-axial flow and axial flow turbines, among which the radial flow and radial-axial flow turbines whose working medium flow direction is from the outer circumference to the center are called centripetal. turbine. Compared with radial turbines, radial turbines have the advantages of small size, light weigh...

AI Technical Summary

Problems solved by technology

The closed impeller cover is attached to the blade, which has a large mass and large centrifugal force, and has the disadvantages of being difficult to clean. It is difficult to work in the fluid working medium with impurities. In the semi-open impeller, the impeller between the cover and the blade The head clearance will greatly affect the aerodynamic efficiency of the turbine

In order to improve efficiency, it is necessary to reduce the blade tip clearance as much as possible. Therefore, the blade flutter of the turbine impeller during operation causes the blade tip of the impeller inlet and outlet to be easily worn, which affects the aerodynamic efficiency, impeller life and safety of the centripetal turbine. Extremely unfavorable

Images