Measuring device for dynamic cooling of radial dynamic pressure air bearing

Abstract

The invention belongs to the technical field of air bearings, and in particular relates to a dynamic cooling measurement device for radial dynamic pressure air bearings. The radial dynamic pressure air bearing dynamic cooling measurement device includes: a radial dynamic pressure air bearing tester, a test device control system, a signal acquisition and processing system, an air supply system, and a water cooling system; it adopts a measurement device supported by a dynamic pressure air bearing , the maximum speed can reach 100,000 revolutions, and can realize the functions of measuring the film cooling characteristics of the radial dynamic pressure bearing, the trajectory of the rotor axis, the temperature gradient characteristics of the bearing sleeve, etc. Base.

Description

technical field [0001] The invention belongs to the technical field of air bearings, and in particular relates to a dynamic cooling measurement device for radial dynamic pressure air bearings. Background technique [0002] The radial dynamic pressure air bearing is an elastically supported adaptive dynamic pressure gas bearing. The radial dynamic pressure air bearing is composed of a bearing sleeve 1, an elastic foil 2 and a top layer foil 3, such as figure 1 shown. The radial dynamic pressure air bearing uses the pressure gas film generated by the gas in the wedge-shaped space between the rotor shaft 41 and the bearing surface to support the load. When the rotating shaft rotates at high speed, the gas with a certain viscosity is continuously brought into the wedge-shaped space. The air film generates a certain pressure to lubricate the air film, float the rotating shaft, and run almost without friction. Its main features are small vibration, no friction, good high temperat...

AI Technical Summary

Problems solved by technology

At present, the speed of the electric spindle is 30,000 to 50,000 revolutions, which is lower than the working speed of the dynamic pressure air bearing, so the stability at the working speed cannot be assessed, and as the load increases, the bearing heats up seriously, which affects its dynamic performance. The device is currently Applicable to the experimental research on the short-term bearing capacity and start-stop characteristics of a single bearing

[0006] The advantage of radial dynamic pressure air bearings is high efficiency and long life. During long-term operation, frictional heat will be generated between the shaft and the air film. The heating of the bearing will cause the air film to become thinner and affect the bearing capacity. Therefore, the cooling air path of the bearing Design is a key factor affecting the stability of the air film, but there is currently no relevant measurement device for bearing cooling characteristics

[0007] At present, the radial dynamic pressure air bearing test device mainly conducts experimental research on the static stiffness and bearing capacity of the bearing, and is limited by the rotating speed of the electric spindle, which is generally less than 50,000 revolutions, which is far below the rated operation of the radial dynamic pressure air bearing. The actual working condition with a speed of 100,000 rpm is generally only suitable for short-term bearing capacity and start-stop characteristics research, and the cooling characteristics of the air bearing are not measured, so it is impossible to realize the long-term high-speed stability test research of the dynamic pressure air bearing

Images