CN2209238Y - Pi-slot dynamic and hydrostatic mixed gas bearing - Google Patents
Pi-slot dynamic and hydrostatic mixed gas bearing Download PDFInfo
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- CN2209238Y CN2209238Y CN 94207681 CN94207681U CN2209238Y CN 2209238 Y CN2209238 Y CN 2209238Y CN 94207681 CN94207681 CN 94207681 CN 94207681 U CN94207681 U CN 94207681U CN 2209238 Y CN2209238 Y CN 2209238Y
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- gas bearing
- air feed
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Abstract
A pi-shaped slot dynamic and static pressure mixed type gas bearing belongs to the technical field of gas bearings. The gas bearing provided by the utility model has the advantages of high bearing capacity, high stability, simple structure and wide application. The utility model is characterized in that a pi-shaped slot is arranged on the surface of a rotating shaft, a filtered external pressure bearing is used for supplying gases, and thus, the bearing has two effects of dynamic pressure and static pressure. The bearing has the advantages of better pumping effect and high bearing capacity, and is especially suitable for rotary machines with high speed and heavy load.
Description
The utility model belongs to the gas bearing field.
Gas bearing is with gas rotating shaft to be suspended, and therefore cleans very much, does not have lubricant pollution, also is not subjected to high temperature and radioactive the influence.In addition, because the viscosity of gas is very low, frictional force is little, rotating shaft is moved and not wearing and tearing under high rotating speed, thereby very long operating life is arranged.These advantages make the gas bearing development in recent years very fast, have obtained to use widely.
Simple gas bearing is external-compression type gas bearing (or claiming hydrostatic gas-lubricated bearing), promptly on bearing housing, beat some apertures or process some slits, allow the gas that has been compressed by these apertures or slit, flow in the bearing play and go, play the effect of lubricated and support rotor, from the gap, flow out then.This class bearing is simple in structure, has obtained good application on slow-revving rotating machinery.But its high stability is good inadequately, when rotating speed is very high (for example surpassing per minute 100,000 changes), the phenomenon of self-excitation whirling motion usually can occur.The inclination of abroad developing watt self-applying gas bearing, high stability is relatively good, but the structure more complicated, processing and installation are all inconvenient; The domestic hybrid gas bearing of man type chute's sound (patent No. CN87215713U) of having developed, this bearing is some man type chutes of processing on the surface of axle, when rotor rotates, these grooves can play the effect of viscosity pump, aspiration to bearing centre, has so just been improved the pressure in the bearing play, at bearing inner surface the external pressure air feed has been arranged again simultaneously, this external pressure air feed can improve the bearing capacity of bearing on the one hand, can prevent again that on the other hand dust from entering into the gap.The structure of this bearing is simpler than inclination pad bearing, and the stable surname of operation is also fine, has begun to be applied in small-sized gasometer.(tolerance that for example expands is at 1500 meters but this bearing is at relatively large gasometer
3More than/time) application on be restricted, reason is that bearing capacity seems not enough.The graduate Zhang Wu of Experimental Center of Low-Temperature Technology, Academia Sinica is under the guidance of tutor's Yankee sword, this hybrid gas bearing has been carried out the calculating (low temperature center Master's thesis 1991.6) of flow field analysis, find when groove angle β is 15 °～35 °, bigger attitude angle is all arranged, rather than as the article of pure chevron-notch bearing is recommended about 34 °, find that in addition groove angle is more little, dimensionless warp-wise bearing capacity is big more.The groove angle that the chevron-notch bearing is too small can bring very big difficulty to processing but in practice.
The purpose of this utility model is that a kind of improved gas bearing will be provided, and it can improve the bearing capacity and the stability of bearing significantly.
The utility model is according to chevron-notch active and static pressure mixed type gas bearing experience in actual applications, proposition changes chevron-notch into π shape groove, promptly uniform processing goes out π shape groove on the rotating shaft surface in bearing, groove width is 0.5 to 10 millimeter, groove depth is at 0.01 to 0.05 millimeter, big (diameter is 50 to the 100 millimeters) groove width of shaft diameter, groove depth are got big value, and diameter little (for example 10 to 20 millimeters) groove width, groove depth get the small value.The intermediate portion of groove is the straight trough parallel with shaft axis, two ends be the band angle skewed slot, angle of bevel at 15 ° to 35 scope.Simultaneously, the external pressure air feed that filtration is arranged again at bearing inner surface, the external pressure air feed can be a hole throttle type, hole diameter is 0.1 to 0.5 millimeter, the radius clearance of bearing is between 0.01 to 0.05 millimeter, the air feed aperture can have circular air cavity at bearing inner surface, and the air cavity degree of depth is 1/4 hole diameter to 1/2 hole diameter, and the air feed aperture can be with single or many rows.The external pressure air feed also can be the narrow annular channel throttle type, and the slit height is 0.01 to 0.04 millimeter, and the bearing radius clearance is between 0.01 to 0.05 millimeter, and slit can be single or many rows.
The utility model has the advantages that: 1. can obtain less groove angle, thereby further improve the bearing capacity of bearing; 2. the straight trough of centre and parallel axes has " step effect " when high speed rotating, can improve the pressure of bearing centre part, and this step effect is very responsive to the variation of gap length, therefore, makes this bearing have bigger rigidity; 3. the pressure distribution of intermediate portion is uniformly, rather than becomes pointed shape as chevron-notch.Therefore, when the external pressure air feed (promptly not in bearing centre single row of holes air inlet) that has more than two rows, needn't worry that also dust accumulates in bearing centre under the pump-absorb action of groove, make operation more reliable.(Fig. 1 is a π shape groove active and static pressure mixed type gas bearing, and 1 is rotating shaft among the figure, 2 bearings for band air feed aperture.）
The utility model design example:
As shown in Figure 1, shaft diameter D=50mm; Bearing length L=75mm has π shape groove on the axle; Groove depth h=0.02mm, groove width W=6mm, skewed slot angle β=20 °; The length L of the straight trough part of π shape groove
1=37.5mm; The little gas inlet hole of two rows is arranged, hole diameter d=0.3mm on the bearing; Supply gas pressure P=0.6MPa; Bearing radius clearance H=0.02mm.
Implementation suggestion of the present utility model is as follows:
1. the π shape groove on the axle can be with ion beam machining or acid etching.
2. bearing air feed aperture is at the air cavity of bearing inner surface, and the length of spray nozzle of the gas supply that can be by designing appropriate size realizes.Fig. 2 is the air feed aperture of band air cavity, and 2 is bearing among the figure, and 3 is spray nozzle of the gas supply, and 4 and 5 all is circular air cavity.
3. the processing of the air feed slit of bearing can make two to bearing, after milling out groove on the sheet, two is lumped together again.Fig. 3 is the structure of air feed seam, and 6 be a slice of trough of belt not among the figure, and 7 is a slice that mills out air supply trough.
Claims (6)
1, a kind of π shape groove active and static pressure mixed type gas bearing, feature of the present utility model is that π shape groove is arranged on the surface of bearing shaft, and the external pressure air feed of filtration is arranged again at the internal surface of bearing simultaneously.
2, by the described gas bearing of claim 1, it is characterized in that the external pressure air feed can be hole throttle type, hole diameter is 0.1 to 0.5 millimeter, and the bearing radius clearance is between 0.01 to 0.05 millimeter.
3, by the described gas bearing of claim 2, it is characterized in that the air feed aperture can have circular air cavity at bearing inner surface, the air cavity degree of depth is 1/4 hole diameter to 1/2 hole diameter.
4,, it is characterized in that aperture can use single row or multiple rows by the described gas bearing of claim 2.
5, by the described gas bearing of claim 1, it is characterized in that the external pressure air feed can be the narrow annular channel throttle type, the slit height is 0.01 to 0.04 millimeter, and the bearing radius clearance is between 0.01 to 0.05 millimeter.
6, by the described gas bearing of claim 5, it is characterized in that slit can be single row or multiple rows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94207681 CN2209238Y (en) | 1994-04-08 | 1994-04-08 | Pi-slot dynamic and hydrostatic mixed gas bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94207681 CN2209238Y (en) | 1994-04-08 | 1994-04-08 | Pi-slot dynamic and hydrostatic mixed gas bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2209238Y true CN2209238Y (en) | 1995-10-04 |
Family
ID=33825941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94207681 Expired - Fee Related CN2209238Y (en) | 1994-04-08 | 1994-04-08 | Pi-slot dynamic and hydrostatic mixed gas bearing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2209238Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100553962C (en) * | 2008-10-27 | 2009-10-28 | 李新桥 | A kind of high precision dynamic gas transmission device for corrugated machine |
| CN101799074A (en) * | 2010-04-13 | 2010-08-11 | 昆明理工大学 | Pi-shaped groove sealing ring |
| CN101395373B (en) * | 2006-02-28 | 2010-10-13 | Bsh博世和西门子家用器具有限公司 | Linear compressor or refrigerating unit comprising a discharge device for fluid condensate |
| CN101691879B (en) * | 2009-10-09 | 2011-02-02 | 大连理工大学 | Dynamic and static pressure composite gas bearing with internal pi shaped air wedge groove |
| CN103343775A (en) * | 2013-07-08 | 2013-10-09 | 上海大学 | Gas bearing integrated by dynamic pressure and static pressure |
| CN102472321B (en) * | 2009-12-10 | 2015-06-03 | 株式会社日立制作所 | Slide bearing device and compressor |
| CN107725592A (en) * | 2017-09-30 | 2018-02-23 | 中国工程物理研究院机械制造工艺研究所 | A kind of air-float turntable of narrow annular channel throttling |
-
1994
- 1994-04-08 CN CN 94207681 patent/CN2209238Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101395373B (en) * | 2006-02-28 | 2010-10-13 | Bsh博世和西门子家用器具有限公司 | Linear compressor or refrigerating unit comprising a discharge device for fluid condensate |
| CN100553962C (en) * | 2008-10-27 | 2009-10-28 | 李新桥 | A kind of high precision dynamic gas transmission device for corrugated machine |
| CN101691879B (en) * | 2009-10-09 | 2011-02-02 | 大连理工大学 | Dynamic and static pressure composite gas bearing with internal pi shaped air wedge groove |
| CN102472321B (en) * | 2009-12-10 | 2015-06-03 | 株式会社日立制作所 | Slide bearing device and compressor |
| US9255606B2 (en) | 2009-12-10 | 2016-02-09 | Hitachi, Ltd. | Slide bearing device and compressor |
| CN101799074A (en) * | 2010-04-13 | 2010-08-11 | 昆明理工大学 | Pi-shaped groove sealing ring |
| CN103343775A (en) * | 2013-07-08 | 2013-10-09 | 上海大学 | Gas bearing integrated by dynamic pressure and static pressure |
| CN107725592A (en) * | 2017-09-30 | 2018-02-23 | 中国工程物理研究院机械制造工艺研究所 | A kind of air-float turntable of narrow annular channel throttling |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |