Fan and electronic device employing fan

An electronic device, comprising:

• a cabinet;
• an electronic component, arranged in the cabinet;
• a fan, arranged in the cabinet and configured to dissipate heat from the electronic component or the cabinet, wherein the fan comprises:
• a housing comprising a bottom plate and a shaft sleeve with an internal space, the shaft sleeve is connected with the bottom plate;
• an impeller comprising a wheel hub, a shaft rod, and a thrust plate, the shaft rod comprises a first end and a second end opposite along an axial direction, the first end of the shaft rod is connected with the wheel hub, the second end of the shaft rod extends into the internal space, and the thrust plate is connected to the second end of the shaft rod;
• a bearing arranged in the internal space, the shaft rod is rotatably connected to the shaft sleeve through the bearing, the bearing is located between the wheel hub and the thrust plate, the bearing has a first end surface and a second end surface opposite along the axial direction, and the bearing further has an inner circumference surface and an outer circumference surface;
• a first axial dynamic pressure oil circuit connected with a surface of the impeller perpendicular to the axial direction, the first axial dynamic pressure oil circuit is configured to generate a first axial dynamic pressure;
• a second axial dynamic pressure oil circuit arranged correspondingly with the first axial dynamic pressure oil circuit, the second axial dynamic pressure oil circuit is configured to generate a second axial dynamic pressure;
• and
• a radial dynamic pressure oil circuit arranged between the inner circumference surface of the bearing and an outer circumference surface of the shaft rod, the radial dynamic pressure oil circuit is configured to generate a radial dynamic pressure;
• wherein a first oil circuit is existed between the inner circumference surface of the bearing and the outer circumference surface of the shaft rod, a second oil circuit is existed between the first end surface and the wheel hub, a third oil circuit is existed between the outer circumference surface of the bearing and the shaft sleeve, and a fourth oil circuit is existed between the second end surface and the thrust plate;
• the first oil circuit, the second oil circuit, the third oil circuit, and the fourth oil circuit are successively connected to form a liquid circuit;
• the impeller can be in a completely suspended state under a combined action of the first axial dynamic pressure, the second axial dynamic pressure, and the radial dynamic pressure;
• and
• wherein the bearing is further provided with a first communication hole, the first communication hole passes through the first end surface and the second end surface, and the first communication hole is connected with the second oil circuit and the fourth oil circuit.