CN119288975B - Elastic foil gas bearing and transmission device - Google Patents
Elastic foil gas bearing and transmission deviceInfo
- Publication number
- CN119288975B CN119288975B CN202411461501.XA CN202411461501A CN119288975B CN 119288975 B CN119288975 B CN 119288975B CN 202411461501 A CN202411461501 A CN 202411461501A CN 119288975 B CN119288975 B CN 119288975B
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- CN
- China
- Prior art keywords
- air
- air injection
- bearing ring
- rotary
- fan
- 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.)
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Classifications
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- 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
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
- F16C17/024—Sliding-contact bearings for exclusively rotary movement for radial load only with flexible leaves to create hydrodynamic wedge, e.g. radial foil bearings
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- 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
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
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- 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
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/02—Rigid support of bearing units; Housings, e.g. caps, covers in the case of sliding-contact bearings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Support Of The Bearing (AREA)
Abstract
The invention belongs to the technical field of mechanical transmission, and discloses an elastic foil gas bearing which comprises an elastic foil gas bearing body, a bearing ring and a rotary jet device, wherein the bearing ring is sleeved and fixed on the outer side of the elastic foil gas bearing body, a rotary jet device mounting groove is formed in the side wall of the bearing ring, which faces the elastic foil gas bearing body, a notch of the rotary jet device mounting groove faces to a gap on the elastic foil gas bearing body, the rotary jet device is rotatably arranged in the rotary jet device mounting groove, a jet channel is formed in the rotary jet device, an air-entraining channel is arranged on the bearing ring at the position corresponding to the rotary jet device mounting groove, and is communicated with the jet channel and used for introducing high-pressure air flow into the jet channel, and the direction of the high-pressure air flow sprayed from the jet channel to a journal is adjusted through rotation of the rotary jet device in the rotary jet device mounting groove. The invention can adjust the air flow direction sprayed to the shaft neck, so that the air flow speed of the rotor surface is reduced.
Description
Technical Field
The invention belongs to the technical field of mechanical transmission, and particularly relates to an elastic foil gas bearing and a transmission device.
Background
Bearings are components that act to fix and reduce the coefficient of friction of the load during mechanical transmission and their primary function is to support the mechanical rotating body to reduce the coefficient of friction of the mechanical load of the device during transmission. In recent years, with the wider and wider application of high-speed rotating machinery in the fields of aerospace, energy equipment and the like, the working environment is increasingly harsh, and the requirements on lubrication and support are gradually increased. In the oil-free lubrication system, compared with the complex and expensive supporting modes such as an electromagnetic bearing, the elastic foil gas bearing has the advantages of high rotating speed, good self-adaption, no abrasion, low cost, high reliability, high temperature resistance and the like, does not need additional auxiliary devices such as oil supply, and has a simple structure, thus being one of key technologies of oil-free lubrication.
Conventional elastomeric foil gas bearings rely on a high speed rotating rotor to apply pressure to the gas, utilizing a wedge effect to create dynamic pressure to carry the load. The bearing uses the elastic foil as a structure, has certain rigidity and also provides a damping effect, so that the bearing can bear certain load. However, the stability of such bearing-rotor systems is not ideal due to the cross-coupling effect of the aerodynamic pressure.
Disclosure of Invention
Aiming at the defects of the prior art, the invention innovatively provides the elastic foil gas bearing and the transmission device, which can spray high-pressure air with certain flow and pressure on the surface of the journal, so that the airflow flowing speed on the surface of the rotor is reduced, the turbulence is reduced, the stability of a bearing-rotor system is improved, the airflow spraying angle is adjustable, and the stability of the bearing-rotor system is further improved.
In order to achieve the technical purpose, the first aspect of the invention discloses an elastic foil gas bearing which is used for being sleeved on a matched shaft neck and comprises an elastic foil gas bearing body, a bearing ring and a rotary air injection device, wherein the elastic foil gas bearing body is sleeved and attached to the outer side of the shaft neck;
The bearing ring is sleeved and fixed on the outer side of the elastic foil gas bearing body, a rotary jet device mounting groove is formed in the side wall, facing the elastic foil gas bearing body, of the bearing ring, a notch of the rotary jet device mounting groove is opposite to a gap on the elastic foil gas bearing body, the rotary jet device is rotatably arranged in the rotary jet device mounting groove, a jet channel is formed in the rotary jet device, an air-entraining channel is arranged on the bearing ring, corresponding to the position of the rotary jet device mounting groove, and is communicated with the jet channel and used for introducing high-pressure air flow into the jet channel, and the direction of the high-pressure air flow from the jet channel to the journal is adjusted through rotation of the rotary jet device in the rotary jet device mounting groove.
Further, the rotary air injection device comprises an air injection cylinder and an air guide fan block, wherein one or more air guide fan blocks are axially fixed on the side wall of the air injection cylinder, and the center of the air guide fan block is fixedly connected with the air injection cylinder;
the rotary air injection device mounting groove comprises a cylindrical groove arranged along the axial direction of the bearing ring and a fan-shaped groove arranged along the circumferential direction of the bearing ring, a notch of the rotary air injection device mounting groove is formed in the cylindrical groove, the fan-shaped groove is intersected with the cylindrical groove, and an air injection cylinder is rotatably arranged in the cylindrical groove so as to drive the air guide fan-shaped block to rotate in the fan-shaped groove;
the bearing ring is provided with the air-entraining channel at the position corresponding to the fan-shaped groove, and the air-entraining channel is communicated with the air-entraining hole.
Further, the outer side wall of the bearing ring is provided with an inwardly extending air entraining hole for accessing a high-pressure air source, the circumferential side wall of the fan-shaped groove on the bearing ring is provided with a plurality of air jet holes along the radial direction of the fan-shaped groove, the air entraining holes are communicated with all the air jet holes to form the air entraining channel, and when the air guide fan-shaped block is rotated by the air jet cylinder, the air guide holes on the air guide fan-shaped block are selectively communicated with one of the air jet holes on the bearing ring.
Further, the plurality of gas injection holes includes gas injection holes directed toward a central axis of the bearing ring, gas injection holes offset to the left from the central axis of the bearing ring, and gas injection holes offset to the right from the central axis of the bearing ring.
Further, the circumference of the fan-shaped circular arc of the air guide fan-shaped block is larger than twice the circumference covered by all the air injection holes.
Further, the rotary air injection device is provided with a plurality of air injection channels along the axial direction of the bearing ring.
Further, the elastic foil gas bearing body comprises a bottom layer arch foil and a top layer foil;
the top foil is arc-shaped, a plurality of top foils are uniformly distributed and attached to the journal along the circumferential direction of the journal, and the gaps are formed between adjacent top foils at intervals;
The outer side of each top foil is correspondingly supported with the bottom arch foil.
Further, the device also comprises a driving device, wherein the driving device is connected with the air injection cylinder through a transmission device and is used for driving the air injection cylinder to rotate.
Further, the transmission device comprises a sector gear and an inner gear ring meshed with the sector gear, the circle center of the sector gear is fixedly connected with the air injection cylinder, and the inner gear ring is fixed on the bearing ring.
To achieve the above object, a second aspect of the present invention discloses a transmission device, which includes the elastic foil gas bearing according to the first aspect.
The beneficial effects of the invention are as follows:
The bearing ring is provided with the rotary air injection device which can rotate, the rotary air injection device can inject air flow towards the shaft neck, and when the rotary air injection device rotates, the air flow direction of the shaft neck can be adjusted, so that the air flow speed on the surface of the rotor is reduced, the flow which is originally in a turbulent state is disturbed, and the stability of a bearing-rotor system is effectively improved.
Drawings
Fig. 1 is a schematic perspective view of an elastic foil gas bearing according to an embodiment of the present invention.
Fig. 2 is a schematic perspective view of another side of an elastic foil gas bearing according to an embodiment of the present invention.
Fig. 3 is a right side view of an elastomeric foil gas bearing in accordance with an embodiment of the invention.
FIG. 4 is an A-A cross-sectional view of a spring foil gas bearing of an embodiment of the invention.
Fig. 5 is a front view of an elastomeric foil gas bearing in accordance with an embodiment of the invention.
1. The air-entraining device comprises a first bearing ring, 11, a cylindrical groove, 12, a sector groove, 13, an air jet hole, 14, an air bleed hole, 15, an air bleed channel, 10, a rotary air jet device, 2, an air jet cylinder, 21, an air jet through hole, 3, an air guide sector block, 31, an air jet hole, 20, an air jet channel, 4, an elastic foil air bearing body, 41, a top foil, 42, a bottom arch foil, 5, a sector gear, 6, an annular gear, 7 and a shaft neck.
Detailed Description
The elastic foil gas bearing and the transmission device provided by the invention are explained and illustrated in detail below with reference to the accompanying drawings.
The embodiment specifically discloses an elastic foil gas bearing which is used for being sleeved on a matched shaft neck 7, as shown in fig. 1-4, and comprises a bearing ring 1, an elastic foil gas bearing body 4 and a rotary jet device 10, wherein the elastic foil gas bearing body 4 is sleeved and attached to the outer side of the shaft neck 7, the elastic foil gas bearing body 4 comprises a bottom layer arch foil 42 and top layer foils 41, the top layer foils 41 are arc-shaped, a plurality of top layer foils 41 are attached to the shaft neck 7 in a uniformly distributed mode along the circumferential direction of the shaft neck 7, gaps are formed between every two adjacent top layer foils 41, a plurality of gaps are formed on the elastic foil gas bearing body 4, the number of the gaps is the same as that of the top layer foils 41, and the bottom layer arch foil 42 is correspondingly supported on the outer side of each top layer foil 41. The bottom layer arch foil 42 is fixedly connected with the top layer foil 41, and two ends of the bottom layer arch foil 42 do not exceed two ends of the top layer foil 41.
The bearing ring 1 is sleeved and fixed on the outer side of the elastic foil gas bearing body 4, in this embodiment, the inner side refers to the side close to the central axis of the elastic foil gas bearing, and the outer side refers to the side far away from the central axis of the elastic foil gas bearing. As shown in fig. 1, 2 and 4, the bottom layer arch foil 42 is fixedly connected with the inner ring of the bearing ring 1, and one end of the top layer foil 41 is fixedly connected with the inner ring of the bearing ring 1, wherein the fixing manner can be welding or riveting. The side wall (i.e. the inner ring) of the bearing ring 1, which faces the elastic foil gas bearing body 4, is provided with a rotary jet device mounting groove for mounting the rotary jet device, and the notch of the rotary jet device mounting groove is opposite to the gap on the elastic foil gas bearing body 4, so that gas can be jetted to the shaft neck through the notch and the gap. Preferably, the number of the rotary jetting tool mounting grooves is the same as the number of the gaps and corresponds to one, and the rotary jetting tool mounting grooves can jet air symmetrically to the journal. The rotary jet device 10 is rotatably arranged in a rotary jet device mounting groove, a jet channel 20 is formed in the rotary jet device 10, an air entraining channel 15 is arranged on the bearing ring 1 corresponding to the position of the rotary jet device mounting groove, the air entraining channel 15 is communicated with the jet channel 20 and is used for introducing high-pressure air flow into the jet channel 20, and the direction of the high-pressure air flow from the jet channel 20 to the journal 7 is adjusted through rotation of the rotary jet device 10 in the rotary jet device mounting groove. Namely, through the rotation of the rotary jet device 10, the included angle between the jet channel 20 and the outer circumferential surface of the journal 7 can be adjusted, the direction of high-pressure air flow blowing to the journal is adjusted, the air flow speed on the surface of the rotor is reduced, the flow in a turbulent state is disturbed, and the stability of the bearing-rotor system is effectively improved.
As shown in fig. 1-4, the rotary air injection device 10 comprises an air injection cylinder 2 and air guide fan-shaped blocks 3, wherein one or more air guide fan-shaped blocks 3 are axially fixed on the side wall of the air injection cylinder 2, and the center of the air guide fan-shaped blocks 3 is fixedly connected with the air injection cylinder 2. When the number of the air guide fan blocks 3 is plural, the distance between the adjacent air guide fan blocks 3 is kept. The jet cylinder 2 is provided with jet through holes 21 along the diameter direction of the jet cylinder 2, the jet through holes 21 penetrate the jet cylinder 2 along the diameter direction of the jet cylinder 2, the air guide fan-shaped blocks 3 are provided with air guide holes 31 along the radial direction of the air guide fan-shaped blocks 3, the air guide holes 31 are communicated with the jet through holes 21 to form jet channels 20, as shown in fig. 4, each air guide fan-shaped block 3 is provided with one air guide hole 31, each position of the jet cylinder 2 corresponding to one air guide fan-shaped block 3 is provided with one jet through hole 21, the jet through holes 21 and the air guide holes 31 form jet channels 20, and the jet channels 20 can be in a straight line shape or a broken line shape, and are preferably in a straight line shape as shown in fig. 4.
Preferably, the rotary air injection device 10 is provided with a plurality of air injection channels 20 along the axial direction of the bearing ring 1, namely, a plurality of air guide fan-shaped blocks 3 are fixed on the side wall of the air injection cylinder 2 along the axial direction, so that the air injection flow is increased. And the flow rate of the high-pressure air flow can be adjusted according to the number of the air injection passages 20 selected for injecting the high-pressure air flow.
As shown in fig. 1,2 and 4, the rotary jet device mounting groove comprises a cylindrical groove 11 arranged along the axial direction of the bearing ring 1 and a fan-shaped groove 12 arranged along the circumferential direction of the bearing ring 1, the notch of the rotary jet device mounting groove is formed in the cylindrical groove 11, one side of the cylindrical groove 11, which faces the elastic foil gas bearing body 4, is provided with a strip-shaped opening along the axial direction as a notch, so that the cylindrical groove 11 is communicated with a gap on the elastic foil gas bearing body 4, and the air flow ejected by the jet through holes 21 can be guaranteed to be ejected to the journal 7 through the gap. The number of the fan-shaped grooves 12 is the same as that of the air guide fan-shaped blocks 3 on the air injection cylinder 2, the fan-shaped grooves 12 are intersected with and communicated with the cylindrical grooves 11, the air injection cylinder 2 is rotatably arranged in the cylindrical grooves 11 to drive the air guide fan-shaped blocks 3 to rotate in the fan-shaped grooves 12, the air injection cylinder 2 plays a role of a rotating shaft at the moment, and the air injection cylinder 2 rotates around the axis of the air injection cylinder 2.
As shown in fig. 4, the bearing ring 1 is provided with a bleed air channel 15 at a position corresponding to the fan-shaped groove 12, and the bleed air channel 15 is communicated with a bleed air hole 31. Specifically, as shown in fig. 1-4, the outer side wall of the bearing ring 1 is provided with an inwardly extending air entraining hole 14 for accessing a high-pressure air source, the circumferential side wall of the bearing ring 1 along the fan-shaped groove 12 is provided with a plurality of air jet holes 13 along the radial direction of the fan-shaped groove 12, and the air entraining hole 14 penetrates all the air jet holes 13 from the side surface and is communicated with all the air jet holes 13 to form an air entraining channel 15. In use of the bearing, it is necessary to access an external source of high pressure air from the bleed holes 14 to introduce a high pressure air flow. When the air guide fan-shaped block 3 is driven to rotate by the air injection cylinder 2, the air guide hole 31 on the air guide fan-shaped block 3 is selectively communicated with one air injection hole 13 on the fan-shaped groove 12, so that the air injection channel 20 is communicated with the air guide channel 15, and the air injection through hole 21 is communicated with a gap, namely, air flow can be injected to the shaft neck 7 through the gap. As shown in fig. 4, the plurality of air injection holes 13 on the bearing ring 1 are all arranged along the radial direction of the sector grooves, when the air injection cylinder 2 and the air guide sector block 3 rotate, the air injection through holes 21, the air guide holes 31 and one of the air injection holes 13 can be communicated, and high-pressure air flows are injected onto the journal 7. Through the rotation of the air injection cylinder 2 and the air guide fan-shaped block 3, the included angle between the axial direction of the air injection through hole 21 and the outer circumferential surface of the shaft neck 7 is different, namely the air flow direction is adjusted, so that the air flow speed on the surface of the rotor is reduced, the flow in a turbulent state is disturbed, and the stability of the bearing-rotor system is effectively improved.
Optionally, the axes of the plurality of air injection holes 13 arranged on the bearing ring 1 are along the radial direction of the sector-shaped groove 12, wherein the axes comprise the air injection holes 13 pointing to the central axis of the bearing ring, the air injection holes 13 deviating to the left from the central axis of the bearing ring and the air injection holes 13 deviating to the right from the central axis of the bearing ring, and when the air guide sector block 3 is carried by the air injection cylinder 2 to rotate, different air injection effects can be achieved when the air injection through holes 21 and the air guide holes 31 on the air guide sector block 3 are respectively communicated with the air injection holes 13 pointing to the central axis of the bearing ring, the air injection holes 13 deviating to the left from the central axis of the bearing ring or the air injection holes 13 deviating to the right from the central axis of the bearing ring.
Alternatively, the circular arc circumference of the gas guide segment 3 is greater than twice the circumference covered by all the gas injection holes 13. Preferably, the gas injection holes 13 are provided in the middle of the gas guide sector 3. When the circumference of the fan-shaped circular arc of the air guide fan-shaped block 3 is larger than twice the circumference covered by the air jet holes 13, the left side edge of the air guide fan-shaped block 3 just shields the air jet holes 13 at the leftmost side when the air guide holes 31 on the air guide fan-shaped block 3 are aligned with the air jet holes 13 at the rightmost side, so that the leakage of air is avoided, and a good leakage preventing effect is achieved, and the opposite direction is also achieved.
Preferably, the bearing ring 1 is uniformly provided with a plurality of rotary jet device mounting grooves in the circumferential direction, and the number of the rotary jet devices 10 is the same as the number of the rotary jet device mounting grooves. More preferably, the number of the rotary jet 10 and the rotary jet mounting grooves is the same as the number of the gaps on the elastic foil gas bearing body 4.
Preferably, as shown in fig. 1 and 2, the cylindrical groove 11 penetrates through the axial direction of the bearing ring 1, and a plurality of air guide sector blocks 3 are axially fixed on the air injection cylinder 2, so that the flow rate of air flow can be increased.
As shown in fig. 5, in order to drive the air injection cylinder 2, the elastic foil gas bearing of the present application further comprises a driving device, which is connected to the air injection cylinder 2 through a transmission device, for driving the air injection cylinder 2 to rotate around its own axis. Optionally, the transmission device comprises a sector gear 5 and an inner gear ring 6 meshed with the sector gear 5, the circle center of the sector gear 5 is fixedly connected with the air injection cylinder 2, the sector gear 5 is fixed on the side wall of the air injection cylinder 2, and the inner gear ring 6 is fixed on the end face of the bearing ring 1. The driving device can be a motor, and the motor is connected with the annular gear 6 to drive the annular gear 6 to rotate, so as to drive the jet cylinder 2 to rotate. The sector gear 5 and the jet cylinder 2 are connected by welding or by spline. The number of the inner gear rings 6 is one, the number of the sector gears 5 is the same as that of the air injection cylinders 2 and are connected in one-to-one correspondence, and the driving device can drive all the air injection cylinders to rotate at the same time.
The transmission may also be a gear transmission or a worm gear transmission.
Alternatively, the transmission comprises a sector gear 5 and a worm meshed with the sector gear 5. The driving device is a motor, an output shaft of the motor is connected with a worm, the worm is driven to rotate, and then the jet cylinder 2 is driven to rotate.
The working principle of the elastic foil gas bearing provided by the embodiment of the application is as follows:
When the bearing works, the air guide holes 14 arranged on the outer side of the circumference of the bearing ring 1 are connected with an external high-pressure air source so as to introduce high-pressure air flow, the driving device drives the air injection cylinder 2 and the air guide fan-shaped block 3 to rotate through the transmission device, a plurality of air guide holes 13 are formed in the circumferential side wall of the fan-shaped groove 12 along the radial direction, when the air guide fan-shaped block 3 is driven by the air injection cylinder 2 to rotate, the air guide holes 31 on the air guide fan-shaped block 3 are selectively communicated with one of the air guide holes 13 on the fan-shaped groove 12, the air guide holes 13 are communicated with the air guide holes 14, the high-pressure air flow enters the air guide holes 13 from the air guide holes 14 and then enters the air guide holes 31, finally, the high-pressure air flow is sprayed out of the air guide holes 21 on the air injection cylinder 2, and the air is sprayed onto the journal 7 through the notch of the installation groove of the rotary air injection device and the gap on the elastic foil air bearing body 4, and the cooling effect can be achieved on the journal 7. When the jet direction is oblique (i.e. jet is not perpendicular to the circumferential surface of the journal), the oblique air flow can reduce the air flow velocity on the surface of the rotor, disturb the air flow in the turbulent state originally, effectively increase the stability of the bearing-rotor system, and especially have obvious effect when the jet direction is opposite to the bearing rotation direction. The bearing ring 1 is provided with a plurality of air injection holes 13, so that when the air guide fan-shaped block 3 rotates, the communication between the air guide channel and the air injection channel can be ensured, and the direction of the air injection can be effectively regulated.
The elastic foil gas bearing of the application has the following advantages:
1. The bearing ring is provided with the rotary air injection device which can rotate, the rotary air injection device can inject air flow towards the shaft neck, and when the rotary air injection device rotates, the air flow direction of the shaft neck can be adjusted, so that the air flow speed on the surface of the rotor is reduced, the flow which is originally in a turbulent state is disturbed, and the stability of a bearing-rotor system is effectively improved.
2. The smart design of the air guide sector block and the sector groove is that the circumference of the sector arc of the air guide sector block is more than twice of the circumference covered by the air jet hole. The air flow spraying direction on the surface of the rotor can be regulated by a simple and reliable structure, and the regulating range is wider.
The embodiment also discloses a transmission device which comprises the elastic foil gas bearing. The transmission device can be applied to the fields of aerospace, energy equipment and the like.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected through an intervening medium, or in communication between two elements or in an interaction relationship between two elements, unless otherwise explicitly specified. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, a description referring to the terms "present embodiment," "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any at least one embodiment or example. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the invention, but any modifications, equivalents, and simple improvements made within the spirit of the present invention should be included in the scope of the present invention.
Claims (8)
1. The elastic foil gas bearing is used for being sleeved on a matched shaft neck (7) and comprises an elastic foil gas bearing body (4), wherein the elastic foil gas bearing body (4) is sleeved and attached to the outer side of the shaft neck (7), and the elastic foil gas bearing is characterized by further comprising a bearing ring (1) and a rotary air injection device (10);
The bearing ring (1) is sleeved and fixed on the outer side of the elastic foil gas bearing body (4), a rotary air injection device mounting groove is formed in the side wall, facing the elastic foil gas bearing body (4), of the bearing ring (1), a notch of the rotary air injection device mounting groove is opposite to a gap on the elastic foil gas bearing body (4), the rotary air injection device (10) is rotatably arranged in the rotary air injection device mounting groove, an air injection channel (20) is formed in the rotary air injection device (10), an air bleed channel (15) is formed in the position, corresponding to the rotary air injection device mounting groove, of the bearing ring (1), the air bleed channel (15) is communicated with the air injection channel (20) and is used for introducing high-pressure air flow into the air injection channel (20), and the direction of the high-pressure air flow which is sprayed from the air injection channel (20) to the journal (7) is adjusted through rotation of the rotary air injection device (10) in the rotary air injection device mounting groove;
The rotary air injection device (10) comprises an air injection cylinder (2) and air guide fan-shaped blocks (3), wherein one or more air guide fan-shaped blocks (3) are axially fixed on the side wall of the air injection cylinder (2), the circle center of each air guide fan-shaped block (3) is fixedly connected with the air injection cylinder (2), an air injection through hole (21) is formed in the air injection cylinder (2) along the diameter direction of the air injection cylinder (2), an air guide hole (31) is formed in the air guide fan-shaped block (3) along the radial direction of the air guide fan-shaped block (3), and the air guide hole (31) and the air injection through hole (21) are communicated to form the air injection channel (20);
The rotary air injection device mounting groove comprises a cylindrical groove (11) arranged along the axial direction of the bearing ring (1) and a fan-shaped groove (12) arranged along the circumferential direction of the bearing ring (1), a notch of the rotary air injection device mounting groove is formed in the cylindrical groove (11), the fan-shaped groove (12) is intersected with the cylindrical groove (11), and the air injection cylinder (2) is rotatably arranged in the cylindrical groove (11) to drive the air guide fan-shaped block (3) to rotate in the fan-shaped groove (12);
The bearing ring (1) is provided with the air-entraining channel (15) at the position corresponding to the fan-shaped groove (12), and the air-entraining channel (15) is communicated with the air-entraining hole (31);
The bearing ring is characterized in that an inwardly extending air entraining hole (14) is formed in the outer side wall of the bearing ring (1) and is used for being connected with a high-pressure air source, a plurality of air jet holes (13) along the radial direction of the fan-shaped groove (12) are formed in the circumferential side wall of the fan-shaped groove (12) on the bearing ring (1), the air entraining hole (14) and all the air jet holes (13) are communicated to form an air entraining channel (15), and when the air guide fan-shaped block (3) is carried by the air jet cylinder (2) to rotate, the air guide hole (31) on the air guide fan-shaped block (3) is selectively communicated with one of the air jet holes (13) on the bearing ring (1).
2. The flexible foil gas bearing of claim 1, wherein the plurality of gas injection holes (13) comprises gas injection holes (13) directed towards a central axis of the bearing ring (1), gas injection holes (13) offset to the left from the central axis of the bearing ring (1), and gas injection holes (13) offset to the right from the central axis of the bearing ring (1).
3. A flexible foil gas bearing according to claim 1, characterized in that the circular sector circumference of the gas guiding segment (3) is greater than twice the circumference covered by all gas injection holes (13).
4. A flexible foil gas bearing according to any one of claims 1-3, characterized in that the rotary gas injection means (10) is provided with a plurality of said gas injection channels (20) in the axial direction of the bearing ring (1).
5. A flexible foil gas bearing as defined in claim 1, wherein,
The elastic foil gas bearing body (4) comprises a bottom layer arch foil (42) and a top layer foil (41);
The top foil (41) is arc-shaped, a plurality of top foils (41) are uniformly distributed and attached to the shaft neck (7) along the circumferential direction of the shaft neck (7), and the gaps are formed between the adjacent top foils (41) at intervals;
The outer side of each top foil (41) is correspondingly supported with the bottom arch foil (42).
6. A flexible foil gas bearing according to claim 1, further comprising driving means connected to the gas injection cylinder (2) by transmission means for driving the gas injection cylinder (2) in rotation.
7. The elastic foil gas bearing according to claim 6, wherein the transmission device comprises a sector gear (5) and an inner gear ring (6) meshed with the sector gear (5), the center of the sector gear (5) is fixedly connected with the air injection cylinder (2), and the inner gear ring (6) is fixed on the bearing ring (1).
8. A transmission comprising a flexible foil gas bearing as claimed in any one of claims 1 to 7.
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| CN202411461501.XA CN119288975B (en) | 2024-10-18 | 2024-10-18 | Elastic foil gas bearing and transmission device |
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| CN202411461501.XA CN119288975B (en) | 2024-10-18 | 2024-10-18 | Elastic foil gas bearing and transmission device |
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| CN119288975A CN119288975A (en) | 2025-01-10 |
| CN119288975B true CN119288975B (en) | 2025-08-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN214881682U (en) * | 2021-05-28 | 2021-11-26 | 重庆优特模具有限公司 | Cooling device in quenching furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9976595B2 (en) * | 2015-08-21 | 2018-05-22 | Board Of Regents, The University Of Texas System | Hybrid foil bearings having integrated gas flow paths |
| CN113357258B (en) * | 2021-03-29 | 2025-06-27 | 启承悬浮科技(西安)有限公司 | A method for installing a foil dynamic pressure gas thrust bearing |
| CN218992116U (en) * | 2022-12-30 | 2023-05-09 | 江苏中科锐能电气有限公司 | Combined bearing for steam turbine |
| CN219932741U (en) * | 2023-07-03 | 2023-10-31 | 无锡市新莱珂机械有限公司 | Hybrid foil gas bearing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN214881682U (en) * | 2021-05-28 | 2021-11-26 | 重庆优特模具有限公司 | Cooling device in quenching furnace |
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