GB2387417A - Contra-rotating air bearing arrangement - Google Patents
Contra-rotating air bearing arrangement Download PDFInfo
- Publication number
- GB2387417A GB2387417A GB0208141A GB0208141A GB2387417A GB 2387417 A GB2387417 A GB 2387417A GB 0208141 A GB0208141 A GB 0208141A GB 0208141 A GB0208141 A GB 0208141A GB 2387417 A GB2387417 A GB 2387417A
- Authority
- GB
- United Kingdom
- Prior art keywords
- air
- air bearing
- contra
- sleeve
- jets
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
- B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
- B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
- B05B3/1071—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces with two rotating members rotating at different speeds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
- B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
- B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
- B05B3/1035—Driving means; Parts thereof, e.g. turbine, shaft, bearings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
- B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
- B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
- B05B3/1071—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces with two rotating members rotating at different speeds
- B05B3/1078—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces with two rotating members rotating at different speeds the rotating members rotating in opposite directions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
- F16C32/0662—Details of hydrostatic bearings independent of fluid supply or direction of load
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
- F16C32/0681—Construction or mounting aspects of hydrostatic bearings, for exclusively rotary movement, related to the direction of load
- F16C32/0696—Construction or mounting aspects of hydrostatic bearings, for exclusively rotary movement, related to the direction of load for both radial and axial load
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrostatic Spraying Apparatus (AREA)
Abstract
A contra-rotating air bearing comprises two concentrically arranged cylindrical shafts 2, 3 which are rotated about the same axis and in different (or potentially in the same) direction, a central journal/sleeve 1 and an air film 14, 15 and wherein the outer shaft 3 is hollow. Journal 1 comprises a plurality of internal and external radial jets 14, 15 and front and back axial jets 6, 7 in addition to an air supply inlet 12 which allows air to be supplied under pressure to the aforementioned jets, thereby creating air films 14, 15 which support shafts 2, 3. The independently controlled shafts may be rotated by an air turbine or similar rotor devices. Such an arrangement is described as being applicable to paint sprays, rotary deposition devices and machines/devices of a general nature.
Description
À _ r À | Title: Contra-rotating air bearing 23874 1 7
Description
This invention relates to the field of air bearing design. The inventive step in the
design of a contra-rotating air bearing herein disclosed will provide benefits in the cost of manufacture, cost of operation and size of devices requiring two shafts to be rotated in the same or different directions, such as in a rotary deposition device used for spraying paint onto a surface.
In the field of paint spraying two concentrically rotating shafts, rotating at different
and independently controllable speeds, are desirable to accurately propel paint towards a surface and to achieve a fine particularization or atomisation of said paint. In a previous invention (EP 0246032 A, Budden, 1987) one hollow cylindrical shaft, supported by a ball bearing was incorporated into a rotary deposition device so as to turn a diffuser disc, which sprayed paint onto a surface. An improvement to this invention required two shafts with external 'bell-shaped' members to be turned in opposite directions in order to achieve a finer atomisation of paint (EP10661 17, Stratton and Taylor, 1998). The two shafts were supported by separate air bearing journals and axially located by separate axial thrust bearings. A 'curtain' of air was also applied to substantially concentrate the 'beam of paint' that was produced (EP10661 17, Stratton and Taylor, 1998). The incorporation of air bearings into the design of a rotation deposition device is beneficial through the reduction of friction between shafts and bearings, which results in a reduction of energy required for operating said device. However, the use of two completely separate air bearing systems to support two concentrically rotating shafts requires a large number of parts, a complex construction and is expensive to manufacture. The incorporation of two air bearings also increases the size and weight of the device and the necessary number of compressed air supplies, which are undesirable consequences.
An object of this invention is to simplify the design of a paint atomiser or any other device with concentrically rotating shafts, to reduce the number of parts required to construct such a device and thereby to reduce its cost of manufacture.
= Accordingly the contra-rotating air bearing described herein employs one air bearing journal to support two shafts. Said contra-rotating air bearing includes a hollow cylinder or journal of suitable material with internal conduits into which a supply of compressed air may be fed. Said journal is perforated so as to support one shaft placed concentrically on the outside of said journal and one shaft placed concentrically inside of said journal on air films of air under pressure. Said shafts are preferably driven by integral air turbine or other suitable rotor system depending on the application needs. Said air turbines being supplied by separate sources of compressed air to each other and to the air bearings. Incorporation of said contra-rotating air bearing would reduce the quantity and volume of parts needed to produce such an apparatus as the aforesaid rotary deposition device, thus reducing the cost of production of such devices.
The reduced number of parts required when employing the contra-rotating air bearing described below in a device such as a rotary deposition device allows a smaller size and lighter weight in comparison to the prior art for a rotary deposition device. As in
the prior art it would be beneficial to further reduce the weight of a device such as the
rotary deposition device, therefore it is preferable to construct the noncritical components of the contra-rotating air bearing out of suitable plastics, ceramics, metals, composite materials or other.
As in the prior art it is possible to use the rotation of one or more of the moving
parts of the contra-rotating air bearing to produce an electrostatic charge if this is desirable, as in the rotary deposition device A preferred embodiment of the invention will now be described with reference to the accompanying drawing.
FIGURE 1 shows a longitudinal section through a contra-rotating air bearing FIGURE 2 is an interpretation of how a contra-rotating air bearing could be incorporated within a rotary deposition device
1 ':,,
As shown in Figure 1 a contra-rotating air bearing comprises a cylindrical sleeve, or journal ( 1) of suitable material with a flange at one end, an inner cylindrical shaft with a flange at one end (2) and an outer cylindrical shaft also with a flange at one end (3).
A plurality of radial jets (4 and 5) is provided internally and externally in rows along sleeve. These are spaced so as to provide equally pressurised air films along the length of the inside and outside of the sleeve.
A plurality of axial jets (6 and 7) is provided on the front and back of the sleeve-
flange these are spaced so as to provide equally pressurised air films across the surfaces of the front and back of the sleeve-flange.
In the cases of both the radial jets and the axial jets it is preferable but not essential that the jets on the inside and outside of the sleeve, or front and back of the sleeve-flange are in line. In Figure 1 three rows of internal and external radial jets are in line whilst the fourth rows of both internal and external radial jets are not in line. The numbers of jets shown in Figure 1 was arbitrarily selected for the purpose of illustrating how the jets might be arranged, the actual number of jets employed may vary between application. The number of jets is not an essential element of this patent.
As shown in Figure 2 the sleeve (1) is inserted into a hollow, outer cylindrical shaft (3), which includes a flange at one end, until the sleeve-flange constrains any forward lateral movement of the sleeve. A front-plate ( 10) provided with axial jets with a supply of compressed air is clamped, or otherwise affixed to the sleeve-flange so as to restrict any forward movement of the outer shaft.
An inner cylindrical shaft with a flange (2) is inserted into the sleeve until the sleeve-flange constrains the forward lateral movement of the shaft. A back-plate (8) provided with axial jets with a supply of compressed air, is clamped, or otherwise attached to the sleeve-flange so as to restrict the backward lateral movement of the inner shaft. The inner cylindrical shaft may be hollow to allow the insertion of a 'medium supply tube' as required in a rotary deposition device.
In the preferred embodiment shown in Figure 1 the axial jets in the front and back-
plates are supplied by the same compressed air source as the axial jets in the sleeve-flange, although this is not an essential element of the design.
In the preferred embodiment shown in Figure 1 a single air inlet (12) is employed to supply the radial and axial jets. Air passes through conduits (13) within the sleeve to said radial and axial jets, whereby it passes into voids between the sleeve and inner and outer shafts, where air films (14 and 15) are formed. Said air films support the shafts so long as a continuous supply of air is maintained. An air exhaust removes air from the air films at a desirable rate via a conduit (16) within the sleeve and sleeve-flange. The air exits to atmosphere.
The shafts may be rotated by any suitable drive mechanism, although in the suggested embodiment shown in Figure 2, air turbines ( 17 and 18) have been used. Said turbines are provided with sufficiently controlled air supplies to control and vary the speed and direction of rotation of each shaft, or to provide a braking mechanism when necessary.
Said air supplies to be separate to the supply of air to the radial and axial jets. Said inner and outer shaft to be supplied with separate speed sensors to measure the speed of rotation of said shafts in any direction and to transmit the data concerning that rotation to external gauges or other suitable displays or control devices.
While certain representative embodiments and details have been shown for purposes of illustrating the invention, it will be apparent to those skilled in the art that various changes in the invention disclosed herein may be made without departing from the scope of the invention, which is defined in the appended claims.
Claims (6)
1. A contra-rotating air bearing where two shafts, concentrically arranged on the same, or a similar axis, are supported on air f lms supplied by a single air bearing journal; | A A I A L _ _ 1_ _ _ _ _, AA _ _ _] __ I _ _ _. A. _
said shafts being rotated independently of each other around said journal in the same or different directions
2. A contra-rotating air bearing as claimed in Claim I consisting of: a flanged sleeve including internal and external radial jets located on said sleeve and axial jets located on said sleeve-flange; said radial and axial jets being supplied with compressed air through one or more conduits located within said sleeve; an inner and outer shaft positioned concentrically to the sleeve and supported by air films of compressed air fed through the radial and axial jets.
3. A contra-rotating air bearing as claimed in Claim 2 where said internal and external shafts are rotated by air turbines, or other suitable rotor devices, the rotation of each shaft being controlled independently of the other.
4. A paint sprayer, or rotary deposition device including a contrarotating air bearing the same as, or substantially similar to that contrarotating air bearing claimed in all of the preceding claims
5. A machine or device containing a contra-rotating air bearing the same as, or substantially similar to that contra-rotating air bearing claimed in Claims 1, 2 and 3
6. A contra-rotating air bearing substantially as claimed above and as illustrated in the accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0208141A GB2387417A (en) | 2002-04-09 | 2002-04-09 | Contra-rotating air bearing arrangement |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0208141A GB2387417A (en) | 2002-04-09 | 2002-04-09 | Contra-rotating air bearing arrangement |
Publications (2)
Publication Number | Publication Date |
---|---|
GB0208141D0 GB0208141D0 (en) | 2002-05-22 |
GB2387417A true GB2387417A (en) | 2003-10-15 |
Family
ID=9934516
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB0208141A Withdrawn GB2387417A (en) | 2002-04-09 | 2002-04-09 | Contra-rotating air bearing arrangement |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2387417A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107899830A (en) * | 2017-12-29 | 2018-04-13 | 重庆市健隆家具有限公司 | Spray-painting plant for desk |
CN107989899A (en) * | 2017-12-13 | 2018-05-04 | 哈尔滨理工大学 | A kind of pump oil pressure automatic adjustable hydrodynamic journal liquid polymers oil pumping device |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2055430A (en) * | 1979-08-04 | 1981-03-04 | Rolls Royce | Air bearing for use with concentric rotary shafts in machines |
EP0246032A2 (en) * | 1986-05-10 | 1987-11-19 | C.A.S.E. Systems Limited | Spray devices and spraying systems |
US5032028A (en) * | 1988-09-20 | 1991-07-16 | Abg Semca S.A. | Fluid film bearing |
DE19721615A1 (en) * | 1997-05-23 | 1998-12-10 | R D T Advanced Painting Techno | Device with rotating bodies |
WO1999029983A1 (en) * | 1997-12-05 | 1999-06-17 | Pentti Pelkonen | Construction beam |
-
2002
- 2002-04-09 GB GB0208141A patent/GB2387417A/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2055430A (en) * | 1979-08-04 | 1981-03-04 | Rolls Royce | Air bearing for use with concentric rotary shafts in machines |
EP0246032A2 (en) * | 1986-05-10 | 1987-11-19 | C.A.S.E. Systems Limited | Spray devices and spraying systems |
US5032028A (en) * | 1988-09-20 | 1991-07-16 | Abg Semca S.A. | Fluid film bearing |
DE19721615A1 (en) * | 1997-05-23 | 1998-12-10 | R D T Advanced Painting Techno | Device with rotating bodies |
WO1999029983A1 (en) * | 1997-12-05 | 1999-06-17 | Pentti Pelkonen | Construction beam |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107989899A (en) * | 2017-12-13 | 2018-05-04 | 哈尔滨理工大学 | A kind of pump oil pressure automatic adjustable hydrodynamic journal liquid polymers oil pumping device |
CN107899830A (en) * | 2017-12-29 | 2018-04-13 | 重庆市健隆家具有限公司 | Spray-painting plant for desk |
CN107899830B (en) * | 2017-12-29 | 2019-06-14 | 重庆市健隆家具有限公司 | Spray-painting plant for desk |
Also Published As
Publication number | Publication date |
---|---|
GB0208141D0 (en) | 2002-05-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |