Cooling system of permanent magnet generator of turbine expansion machine and work method of cooling system

Abstract

The invention discloses a cooling system of a permanent magnet generator of a turbine expansion machine and a work method of the cooling system. The cooling system comprises an inner cooling passage and an outer cooling passage, wherein the inner cooling passage comprises a spraying opening and a pressure relief hole, the spraying opening and the pressure relief hole are formed in a machine case of the generator, the outer side of the spraying opening is provided with an inner cooling passage liquid pump, the outer cooling passage comprises a cooling flow passage, a flow passage inlet and a flow passage outlet, the cooling flow passage is arranged in the machine case of the generator, the flow passage inlet and the flow passage outlet are formed in the machine case of the generator and are respectively connected with the two ends of the cooling flow passage, and the outer side of the flow passage inlet is provided with the external cooling passage liquid pump. The cooling system utilizes the organic Rankine cycle of the permanent magnet generator of the turbine expansion machine, a small part of work media is used as cooling media to be respectively introduced into the inner cooling passage and the outer cooling passage for realizing the liquid cooling on a motor stator and realizing the evaporation cooling on a rotor, the cooling on the motor rotor is realized, and the pressurized sealing of the machine case is also ensured.

Description

technical field [0001] The invention relates to a cooling system of a turboexpander permanent magnet generator and a working method thereof, belonging to the field of permanent magnet motors and motor heat transfer. Background technique [0002] The turbo expander has the advantages of small size, light weight, long service life and convenient maintenance. It has been widely used in refrigeration applications since the 1950s. The energy crisis of the 1970s promoted the use of turboexpander generators for energy recovery. Traditionally, the low-speed generator and the high-speed expander are driven through a reduction mechanism, resulting in a large system size, high failure rate, and high maintenance costs. In recent years, with the development of high-speed permanent magnet motor technology, direct-drive turboexpander generators have attracted the attention of researchers and obtained small-scale applications due to their advantages of small size and low cost. [0003] At...

AI Technical Summary

Problems solved by technology

However, in the direct-drive turboexpander permanent magnet generator system, the generator casing is filled with pressurized gaseous working fluid, and the circulation system is a closed system, which cannot introduce impurities such as air, so ventilation cannot be used. method to air cool the rotor

If only the stator water jacket / oil jacket is used for cooling, it is difficult to effectively reduce the temperature rise of the rotor due to the existence of the air gap

Images