Thrust balancing structure

Abstract

The invention discloses a thrust balancing structure. The structure comprises an air cylinder, a rotor is arranged in the air cylinder, and a centripetal impeller and multiple sets of movable blade grids are sequentially arranged on the rotor; an air pipe comprises a connecting air pipe, an air inlet pipe, an impeller air pipe and multiple blade grid air pipes; the air inlet pipe, the impeller air pipe and the blade grid air pipes communicate through the connecting air pipe; electric control valves are respectively arranged on the air inlet pipe and the blade grid air pipes; an annular cavity comprises an impeller annular cavity with an annular cavity channel and multiple blade grid annular cavities, is arranged on the air cylinder and communicates with the impeller air pipe and the multiple blade grid air pipes; a porous channel comprises an impeller channel and multiple blade grid channels, and the porous channel comprises multiple through holes formed in the circumferential direction; one end of the impeller channel communicates with the impeller air pipe through the annular cavity, and the other end communicates with a back cavity of the centripetal impeller; one end of each blade grid channel communicates with the blade grid air pipe through the annular cavity, and the other end of each blade grid channel communicates with the back cavity of the corresponding movable blade grid. With adoption of the thrust balancing structure, the thrust value of a rotating part of a unit can be controlled in real time.

Description

technical field [0001] The invention relates to a thrust balance structure, which belongs to the technical field of energy power generation. Background technique [0002] The rotating parts of the turbine unit will always generate a certain axial thrust under the action of the inlet and exhaust pressure difference. In order to balance this part of the thrust, it is often necessary to configure a thrust bearing. The power consumption is also greater. In the field of high-speed rotating turbines, more and more equipment began to use electromagnetic bearings and air bearings with low noise and low loss as the thrust bearings of the unit, but the common problem faced by electromagnetic bearings and air bearings is their axial thrust. The bearing capacity is poor. Even if the commonly used rotor balance plate structure is adopted, it can only reduce the thrust value of the unit under rated working conditions to a certain extent, and cannot control the thrust value of the unit un...

AI Technical Summary

Problems solved by technology

In the field of high-speed rotating turbines, more and more equipment began to use electromagnetic bearings and air bearings with low noise and low loss as the thrust bearings of the unit, but the common problem faced by electromagnetic bearings and air bearings is their axial thrust. The bearing capacity is poor. Even if the commonly used rotor balance plate structure is adopted, it can only reduce the thrust value of the unit under rated working conditions to a certain extent, and cannot control the thrust value of the unit under variable or full working conditions at a relatively low level. In the low range, this greatly limits the application of electromagnetic bearings and air bearings in high-pressure, high-speed, and high-power units. At the same time, if oil bearings are used, the loss of the unit will increase

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