High-temperature magnetic suspension bearing cooling system for gas turbine

Abstract

The invention discloses a high-temperature magnetic suspension bearing cooling system for a gas turbine. The system comprises a refrigeration system, a heat shield, a gas turbine rotating shaft, a first radial magnetic suspension bearing, an axial magnetic suspension bearing and a second radial magnetic suspension bearing, wherein the first radial magnetic suspension bearing and the axial magneticsuspension bearing are arranged at one end of the gas turbine rotating shaft, the second radial magnetic suspension bearing is arranged at the other end of the rotating shaft, and the second radial magnetic suspension bearing is close to the rotor side of the gas turbine; the first radial magnetic suspension bearing, the axial magnetic suspension bearing and the second radial magnetic suspensionbearing are all fixed to the outer shell of the gas turbine; the heat shield is arranged outside the second radial magnetic suspension bearing and is fixed to the outer shell of the gas turbine; the refrigerating system comprises a compressor, a heat dissipation condenser, a capillary tube, a drying filter and a refrigerating pipeline which are in circulation connection with each other; the gas turbine rotating shaft is of a hollow structure; a hollow shaft is arranged in the rotating shaft; two ends of the hollow shaft are supported in the rotating shaft through bearings; and the refrigeration pipeline penetrates into the hollow shaft, penetrates out of the hollow shaft and then directly faces the second radial magnetic suspension bearing. The system of the invention has the advantages ofhigh cooling efficiency and reliable operation.

Description

technical field [0001] The invention belongs to the technical field of gas turbines, in particular to a high-temperature magnetic suspension bearing cooling system for gas turbines. Background technique [0002] The high-temperature magnetic suspension bearing replaces the traditional rolling bearing, which can make the bearing close to the high-temperature end, greatly shorten the axial dimension of the engine, and make the engine structure more compact. In addition, the magnetic suspension bearing has the advantages of small friction and wear, no need for lubrication, etc., which can effectively increase the operating speed of the equipment and reduce the weight , Improving efficiency has become a hot spot for industrial developed countries to compete for development; [0003] However, at high temperatures, due to large changes in parameters such as the resistance of the coil, the sensitivity of the sensor will change greatly. Moreover, a large temperature drift will be g...

AI Technical Summary

Problems solved by technology

[0003] However, at high temperatures, due to the large changes in the parameters such as the resistance of the coil, the sensitivity of the sensor will change greatly.

And it will produce a large temperature drift; the insulation layer of the excitation coil used in the magnetic suspension bearing is easy to cause cracking and falling off at high temperature, resulting in a short circuit accident

Therefore, the design of the high-temperature magnetic suspension bearing refrigeration system 22 is very important for the magnetic bearing; the invention patent 201811094843.7 is designed with a cooling mechanism for storing low-temperature fluid, which cools the magnetic bearing by releasing low-temperature fluid, but this type of solution requires continuous injection of low-temperature fluid to maintain The normal use of the cooling mechanism leads to cumbersome use and additional labor costs

Utility model patent 201621153914.2 provides a DC permanent magnet motor refrigeration system 22 with a magnetic levitation refrigerant compressor. This system has high cooling efficiency and absorbs heat through the circulation and evaporation of the refrigerant. However, as a power equipment, the combustion position of the gas turbine will inevitably generate high temperatures. It is impossible to fully cool down the cavity similar to that of the motor

Images