Air floatation electric spindle capable of actively exhausting and controlling exhausting

Abstract

The utility model discloses an air-floating electric spindle capable of actively exhausting and controlling exhausting, which comprises a radial bearing, a thrust bearing is arranged on one side of the radial bearing, a thrust air inlet is arranged in the thrust bearing, a rotating shaft is arranged in the radial bearing, a plurality of radial bearing air inlets are arranged on the radial bearing, and the radial bearing air inlets are communicated with the rotating shaft. An exhaust groove is formed in the inner wall face of the radial bearing, an impeller is arranged at the end, away from the thrust bearing, of the rotating shaft, a rotating shaft exhaust hole is formed in the rotating shaft, and an exhaust ring groove is formed between the radial bearing and the rotating shaft. Air flow enters the rotating shaft through the radial bearing air inlet hole, the exhaust groove and the rotating shaft exhaust hole, takes away internal heat and then is pumped out through the shaft end impeller fan.

Description

Technical Field

[0001] The utility model relates to the technical field of air-floating electric spindles, in particular to an air-floating electric spindle capable of actively exhausting and controlling exhausting. Background Art

[0002] Usually, air-bearing electric spindles have air intake holes and corresponding exhaust channels on the thrust and radial bearings, as well as the bearing housing. The bearing capacity is proportional to the pressure difference between the intake and exhaust, so smooth exhaust is crucial. At the same time, poor air shaft exhaust design not only affects the spindle load capacity but also causes self-excited instability, especially for high-speed air-bearing spindles. Utility Model Content

[0003] The purpose of the present utility model is to provide an air-floating electric spindle capable of active and controlled exhaust, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an air-floating electric spindle that can actively exhaust and control exhaust, comprising a radial bearing, a thrust bearing is provided on one side of the radial bearing, a thrust air hole is provided inside the thrust bearing, a rotating shaft is provided inside the radial bearing, a plurality of radial bearing air inlet holes are provided on the radial bearing, an exhaust groove is provided on the inner wall of the radial bearing, an impeller is provided on the end of the rotating shaft away from the thrust bearing, a rotating shaft exhaust hole is provided on the rotating shaft, and an exhaust ring groove is provided between the radial bearing and the rotating shaft.

[0005] Preferably, the rotating shaft is a hollow rotating shaft, and the rotating shaft exhaust hole is connected to the hollow rotating shaft.

[0006] Preferably, a small hole throttling air nozzle is provided below the radial bearing air inlet hole, and the small hole throttling air nozzle is connected to the exhaust ring groove.

[0007] Compared with the prior art, the beneficial effect of the present invention is that airflow enters the rotating shaft through the radial bearing air inlet hole, the exhaust groove and the rotating shaft exhaust hole, takes away the internal heat and is then extracted through the shaft end impeller fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0009] Figure 2 This is a schematic diagram of the planing at point A of the present invention;

[0010] Figure 3 This is a schematic diagram of the planing at B of the present invention.

[0011] In the figure: 1. Radial bearing; 2. Thrust bearing; 3. Thrust air hole; 4. Rotating shaft; 5. Radial bearing air inlet hole; 6. Exhaust groove; 7. Impeller; 8. Rotating shaft exhaust hole; 9. Exhaust ring groove. DETAILED DESCRIPTION

[0012] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0013] Please refer to 1-3. An embodiment provided by the utility model: an air-floating electric spindle that can actively exhaust and control exhaust, including a radial bearing 1, characterized in that: a thrust bearing 2 is provided on one side of the radial bearing 1, a thrust air hole 3 is provided inside the thrust bearing 2, a rotating shaft 4 is provided inside the radial bearing 1, a plurality of radial bearing air inlet holes 5 are provided on the radial bearing 1, an exhaust groove 6 is provided on the inner wall of the radial bearing 1, an impeller 7 is provided at the end of the rotating shaft 4 away from the thrust bearing 2, a rotating shaft exhaust hole 8 is provided on the rotating shaft 4, an exhaust ring groove 9 is provided between the radial bearing 1 and the rotating shaft 4, the air flow enters the exhaust ring groove 9 from the radial bearing air inlet hole 5, and then enters the rotating shaft exhaust hole 8, and is discharged from the rotating shaft 4. When the rotating shaft 4 rotates, the impeller 7 at the tail end rotates, generating attraction, thereby promoting the flow of internal airflow.

[0014] The rotating shaft 4 is a hollow rotating shaft, and the rotating shaft exhaust hole 8 is connected to the hollow rotating shaft to facilitate air flow.

[0015] A small hole throttling air nozzle is provided below the radial bearing air inlet hole 5, and the small hole throttling air nozzle is connected to the exhaust ring groove 9. When the impeller 7 rotates, the external air flow is attracted to enter, and the gas flowing out of the small hole throttling hole is extruded through the working surface (the gap between the shaft and the bearing) to the exhaust ring groove 9. The gas is discharged through the rotating shaft exhaust hole 8, the axial hollow hole and the impeller 7 flow control. The small hole throttling air shaft diameter nozzle corresponds to the shaft diameter annular extrusion layer (the gap between the shaft and the bearing). Any axial flow to the annular (exhaust) groove at the end of the bearing corresponds to the rotating shaft exhaust ring groove 9, and flows out to the end through the rotating shaft axial hollow hole.

[0016] Working principle: The radial bearing air inlet hole 5 enters the shaft exhaust hole 8 through the exhaust ring groove 9, and is then discharged from the hollow channel of the shaft 4. The thrust bearing 2 enters the shaft exhaust hole 8 through the flange shaft diameter hole. The impeller 7 fan is installed at the tail of the shaft. The exhaust is controlled by adjusting the radial exhaust throttle holes 8 in various parts of the shaft 4 and the size of the shaft end fan to suppress the vibration of the shaft.

Claims

1. An air-bearing electric spindle capable of active and controlled exhaust, comprising a radial bearing (1), characterized in that: A thrust bearing (2) is provided on one side of the radial bearing (1), a thrust air hole (3) is provided inside the thrust bearing (2), a rotating shaft (4) is provided inside the radial bearing (1), a plurality of radial bearing air inlet holes (5) are provided on the radial bearing (1), an exhaust groove (6) is provided on the inner wall surface of the radial bearing (1), an impeller (7) is provided on the end of the rotating shaft (4) away from the thrust bearing (2), a rotating shaft exhaust hole (8) is provided on the rotating shaft (4), and the rotating shaft exhaust holes (8) are provided in four rows, and an exhaust ring groove (9) is provided between the radial bearing (1) and the rotating shaft (4).

2. The air-bearing electric spindle capable of active and controlled exhaust according to claim 1, characterized in that: The rotating shaft (4) is a hollow rotating shaft, and the rotating shaft exhaust hole (8) is connected to the hollow rotating shaft.

3. The air-bearing electric spindle capable of active and controlled exhaust according to claim 1, characterized in that: A small hole throttling air nozzle is provided below the radial bearing air inlet hole (5).

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