Foil bearing system with self-pressurization and self-cooling capabilities

A foil bearing system with self-pressurization and self-cooling capabilities, comprising turbo impellers (1), positioning spacers (2), a main shaft (3), a compliant support structure (4), a top foil (5) and a bearing sleeve (6);

• specifically:
• the edge of each turbo impeller (1) is provided with a plurality of flow-guide vanes (1-1), and when the turbo impeller (1) rotates with the main shaft, the working medium produces a directional flow;
• and the turbo impeller (1) is provided with a main shaft mounting hole (1-2) in the middle for installing the main shaft (3);
• the positioning spacers (2) are in an annular shape, and the positioning spacers (2) are arranged on cylinders at both ends of the main shaft (3) and fitted with the end faces of a middle cylinder of the main shaft (3) for restricting the position of the turbo impeller (1) on the main shaft (3);
• the main shaft (3) is a stepped cylinder, comprising the middle cylinder and the end cylinders located at both ends, and has an integrated structure, and the diameter of the end cylinders is smaller than that of the middle cylinder;
• and the middle cylinder is installed in conjunction with the inner wall surface of the top foil (5), and the end cylinders are installed in conjunction with the main shaft mounting holes (1-2) of the turbo impellers (1) and the positioning spacers (2);
• the compliant support structure (4) is a cylindrical thin shell formed by bending a rectangular foil, and after the rectangular foil is bent into the cylindrical thin shell, the boundaries of both sides do not come into contact, forming a first gap (4-1);
• and the outer wall surface of the compliant support structure (4) is in contact with the inner wall surface of the bearing sleeve (6), and the inner wall surface of the compliant support structure (4) is in contact with the outer wall surface of the top foil (5);
• the top foil (5) is a cylindrical thin shell formed by bending a rectangular foil, having smooth and flat wall surfaces;
• and the cylinder wall of the top foil (5) is provided with a plurality of first diversion holes (5-3) as fluid channels;
• the bearing sleeve (6) is cylindrical, with a plurality of second diversion holes (6-2) machined on the wall surface as fluid channels.