CN108916217A - A kind of cantilever style radial foil bearing - Google Patents
A kind of cantilever style radial foil bearing Download PDFInfo
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- CN108916217A CN108916217A CN201810939744.8A CN201810939744A CN108916217A CN 108916217 A CN108916217 A CN 108916217A CN 201810939744 A CN201810939744 A CN 201810939744A CN 108916217 A CN108916217 A CN 108916217A
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- 239000011888 foil Substances 0.000 title claims abstract description 241
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 229910000906 Bronze Inorganic materials 0.000 claims description 5
- 229910052790 beryllium Inorganic materials 0.000 claims description 5
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000010974 bronze Substances 0.000 claims description 5
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract 1
- 230000005587 bubbling Effects 0.000 description 24
- 238000013016 damping Methods 0.000 description 20
- 239000000463 material Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000010485 coping Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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
- F16C27/00—Elastic or yielding bearings or bearing supports, for exclusively rotary movement
- F16C27/02—Sliding-contact bearings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Support Of The Bearing (AREA)
Abstract
The present invention provides a kind of cantilever style radial foil bearing, including：Bearing block, multiple resilient support members, multiple cantilever paillons；Wherein, bearing block inner wall offers multiple axial card slots, the corresponding resilient support members of card slot and a cantilever paillon；According to sequence from outside to inside in bearing block, successively installation resilient support members and cantilever paillon, resilient support members one end is fixed in corresponding card slot by pin overlapping with cantilever paillon one end, the resilient support members other end is in free state with the corresponding cantilever paillon other end, and each cantilever paillon other end is circumferentially freely overlapped on adjacent cantilever paillon；Resilient support members are bonded with bearing block inner wall, and resilient support members are contacted with corresponding cantilever paillon line or face contact, segmented line contact or face contact between adjacent cantilever paillon.The present invention has the characteristics that multiple-rigidity, loading force are higher, it is stronger to mitigate the ability of impact vibration, can be widely applied to field of bearings.
Description
Technical Field
The invention relates to the technical field of dynamic pressure gas bearings, in particular to a cantilever type radial foil bearing.
Background
In practical application, the angular deviation of the shaft occurs when the dynamic pressure gas bearing is loaded, which results in the reduction of the bearing capacity and the serious abrasion. Foil gas bearings are hydrodynamic gas bearings having a self-acting compliant surface, typically made of metal foil. The foil gas bearing has certain rigidity and damping due to the flexible surface, and the thickness of a gas film in the bearing can be adaptively changed according to the load condition, so that the bearing can adapt to the angle deviation of a shaft in a certain range, and the bearing capacity and the capacity of relieving impact vibration of the bearing are improved. However, the conventional cantilever type foil bearing cannot well cope with impact load and whirling motion in the operation process through foil deformation due to a single support structure, and is easy to cause friction damage between a shaft and the foil.
The Chinese patent application with the application number of '2012103828306' and the invention name of 'a multi-layer bubbling foil radial dynamic pressure gas bearing' discloses a multi-layer bubbling foil radial dynamic pressure gas bearing, wherein a flat foil and a bubbling foil are always in contact in a load range, so that the rigidity characteristic of the bearing is single. In the static and dynamic characteristic analysis research of the cantilever type foil dynamic pressure gas bearing published by the tenth national gas lubrication and dry gas seal academic convention of the ministry of Jujian, 2012, the bump foil can only provide single rigidity for the bearing.
It can be seen that in the prior art, the foil can only provide a single stiffness for the cantilever-type foil bearing, so that the load force of the cantilever-type foil bearing is low, and the capability of mitigating the impact vibration is also low.
Disclosure of Invention
In view of the above, the main object of the present invention is to provide a cantilever radial foil bearing with multiple stiffness, high load capacity and strong capability of damping shock vibration.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a cantilever-type radial foil bearing comprising: the device comprises a bearing seat, more than three elastic supporting elements and more than three cantilever foils; wherein,
more than three axial clamping grooves are uniformly formed in the inner wall of the bearing seat along the circumferential direction, the number of the elastic supporting elements and the number of the cantilever foils are the same as the number of the clamping grooves, and one clamping groove corresponds to one elastic supporting element and one cantilever foil; sequentially installing corresponding elastic supporting elements and cantilever foils in the bearing seat from outside to inside, wherein one ends of the elastic supporting elements and one ends of the cantilever foils are used as fixed ends and are overlapped and fixed in corresponding clamping grooves through pins, the other ends of the elastic supporting elements and the other ends of the corresponding cantilever foils are used as free ends and are in a free state, and the other end of each cantilever foil is freely lapped on an adjacent cantilever foil along the circumferential direction; the elastic supporting element is attached to the inner wall of the bearing seat, the elastic supporting element is in line contact or surface contact with the corresponding cantilever foils, and adjacent cantilever foils are in segmented line contact or surface contact.
In summary, the cantilever radial foil bearing of the present invention sequentially mounts the corresponding elastic support element and the cantilever foil in the bearing seat from outside to inside, and the elastic support element is attached to the inner wall of the bearing seat. The resilient support element or cantilever foil stretches when the cantilever-type radial foil bearing is loaded. When the load is small, only the cantilever foil extends under the action of the pressure of the air film, and only the cantilever foil plays a supporting role, so that the cantilever type radial foil bearing has cantilever foil structure damping and the elastic supporting element suspends the adjacent arm foils to have friction damping. With the increase of the load, the structural damping of the cantilever foils and the frictional damping between the adjacent cantilever foils of the elastic support element of the cantilever type radial foil bearing are gradually increased. Along with the further increase of the load, the elastic support element and the cantilever foil extend under the action of the pressure of the air film, the elastic support element and the cantilever foil jointly play a supporting role, and at the moment, the cantilever type radial foil bearing has elastic support element structure damping, cantilever foil structure damping, friction damping between the elastic support element and the cantilever foil, and friction damping between the elastic support element and the adjacent cantilever foil; moreover, these frictional damping increases gradually as the load increases. Therefore, with the increase of load, the line contact or the surface contact between the elastic support element and the corresponding cantilever foil, the sectional line contact or the surface contact between the adjacent cantilever foils are further enhanced, and the coupling stiffness of the elastic support element and the cantilever foils is gradually enhanced; meanwhile, along with the increase of the load, the cantilever type radial foil bearing can be more suitable for the angle deviation of the shaft, the elastic supporting element or the cantilever foil generates larger deformation at the end with large deviation, and the elastic supporting element or the cantilever foil generates smaller deformation at the end with small deviation, so that the cantilever type radial foil bearing has better bearing property and capability of coping with the impact.
Drawings
Fig. 1 is a schematic view of the general composition of a cantilever-type radial foil bearing according to the present invention.
Fig. 2 is a schematic structural view of the cantilever-type radial foil bearing of the present invention in a state where the elastic support element is in line contact with the cantilever foil only at the fixed end when the load is small.
Fig. 3 is a schematic structural diagram of the cantilever radial foil bearing of the present invention in a state where the elastic support element and the cantilever foil are completely attached to each other under a large load.
Fig. 4 is a schematic view illustrating a process in which the elastic support member and the cantilever foil come into contact with each other gradually from the fixed end in the case of an increase in load in the cantilever-type radial foil bearing according to the present invention.
Fig. 5(a) is a schematic structural view of the support member with equal height elasticity.
Fig. 5(b) is a schematic structural view of the high elastic support member.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic view of the general composition of a cantilever-type radial foil bearing according to the present invention. As shown in fig. 1, the cantilever-type radial foil bearing of the present invention includes: the device comprises a bearing seat 1, more than three elastic supporting elements 2 and more than three cantilever foils 3; wherein,
more than three axial clamping grooves 5 are uniformly formed in the inner wall of the bearing seat 1 along the circumferential direction, the number of the elastic supporting elements 2 and the number of the cantilever foils 3 are the same as that of the clamping grooves 5, and one clamping groove 5 corresponds to one elastic supporting element 2 and one cantilever foil 3; the method comprises the following steps that corresponding elastic supporting elements 2 and cantilever foils 3 are sequentially installed in a bearing seat 1 from outside to inside, one ends of the elastic supporting elements 2 and one ends of the cantilever foils 3 are used as fixed ends and are overlapped and fixed in corresponding clamping grooves 5 through pins 4, the other ends of the elastic supporting elements 2 and the other ends of the corresponding cantilever foils 3 are used as free ends and are in a free state, and the free end of each cantilever foil 3 is freely lapped on the adjacent cantilever foil 3 along the circumferential direction; the circumferential length of each elastic supporting element 2 is slightly smaller than the distance between the adjacent clamping grooves 5, the elastic supporting elements 2 are attached to the inner wall of the bearing seat 1, the elastic supporting elements 2 are in line contact or surface contact with the corresponding cantilever foils 3, and the adjacent cantilever foils 3 are in segmented line contact or surface contact.
In practical applications, the number of the elastic support elements 2, the number of the cantilever foils 3, and the number of the slots 5 may be determined according to practical requirements.
In the present invention, the length of the cantilever-type radial foil bearing is 25 mm, and the shaft diameter is 25 mm.
In a word, the cantilever type radial foil bearing sequentially mounts the corresponding elastic supporting elements and the corresponding cantilever foils in the bearing seat from outside to inside, and the elastic supporting elements are attached to the inner wall of the bearing seat. The resilient support element or cantilever foil stretches when the cantilever-type radial foil bearing is loaded. When the load is small, only the cantilever foil extends under the action of the pressure of the air film, and only the cantilever foil plays a supporting role, so that the cantilever type radial foil bearing has cantilever foil structure damping and the elastic supporting element suspends the adjacent arm foils to have friction damping. With the increase of the load, the structural damping of the cantilever foils and the frictional damping between the adjacent cantilever foils of the elastic support element of the cantilever type radial foil bearing are gradually increased. Along with the further increase of the load, the elastic support element and the cantilever foil extend under the action of the pressure of the air film, the elastic support element and the cantilever foil jointly play a supporting role, and at the moment, the cantilever type radial foil bearing has elastic support element structure damping, cantilever foil structure damping, friction damping between the elastic support element and the cantilever foil, and friction damping between the elastic support element and the adjacent cantilever foil; moreover, these frictional damping increases gradually as the load increases. Therefore, with the increase of load, the line contact or the surface contact between the elastic support element and the corresponding cantilever foil, the sectional line contact or the surface contact between the adjacent cantilever foils are further enhanced, and the coupling stiffness of the elastic support element and the cantilever foils is gradually enhanced; meanwhile, along with the increase of the load, the cantilever type radial foil bearing can be more suitable for the angle deviation of the shaft, the elastic supporting element or the cantilever foil generates larger deformation at the end with large deviation, and the elastic supporting element or the cantilever foil generates smaller deformation at the end with small deviation, so that the bearing gap, the pressure distribution and the like are basically kept consistent along the axial direction, and the cantilever type radial foil bearing has better bearing characteristics and the capability of coping with the impact.
Fig. 2 is a schematic structural view of the cantilever-type radial foil bearing of the present invention in a state where the elastic support element is in line contact with the cantilever foil only at the fixed end when the load is small. Fig. 3 is a schematic structural diagram of the cantilever radial foil bearing of the present invention in a state where the elastic support element and the cantilever foil are completely attached to each other under a large load. Fig. 4 is a schematic view illustrating a process in which the elastic support member and the cantilever foil come into contact with each other gradually from the fixed end in the case of an increase in load in the cantilever-type radial foil bearing according to the present invention. As shown in fig. 2, 3 and 4, the elastic supporting element 2 of the present invention is in line contact or surface contact with the corresponding cantilever foil 3, and the adjacent cantilever foils 3 are in line contact or surface contact in sections, specifically:
when the cantilever type radial foil bearing is unloaded, the elastic supporting element 2 is in line contact with the corresponding cantilever foil 3 near the fixed end, the elastic supporting element 2 is not in line contact with the corresponding cantilever foil 3 at the other parts except the fixed end, and the adjacent cantilever foils 3 are in line contact at the free lap joint.
When the cantilever type radial foil bearing is loaded, the following conditions can be sequentially generated in a segmentation way along with the gradual increase of the load:
when the load of the cantilever-type radial foil bearing is in a first load range, the elastic support element 2 is in line contact with the corresponding cantilever foil 3 near the fixed end, the elastic support element 2 is not in line contact with the corresponding cantilever foil 3 at the other parts except the fixed end, and the adjacent cantilever foils 3 are in line contact at the extension lap joint. At this time, the cantilever type radial foil bearing only plays a bearing role through the deformation of the cantilever foil 3, and the rigidity of the cantilever type radial foil bearing is only determined by the structural parameters of the cantilever foil 3, such as thickness, curvature radius, foil opening angle, foil number and the like.
When the cantilever type radial foil bearing load is in the second load range, the elastic support element 2 is partially in surface contact with the corresponding cantilever foil 3 from the fixed end, and the adjacent cantilever foils 3 are partially in surface contact at the extension lap joint part. At this time, the cantilever foils 3 are greatly deformed by a large load, a certain degree of surface contact occurs between the mutually overlapped cantilever foils 3, the cantilever foils 3 and the supporting elastic element 2 are gradually in certain surface contact from the fixed end, the cantilever type radial foil bearing plays a bearing role through small partial deformation of the adjacent cantilever foils 3 and partial deformation of the elastic supporting element 2, and the overall supporting rigidity and the local rigidity of the bearing are greatly improved.
When the load of the cantilever type radial foil bearing is in a third load range, the elastic supporting element 2 is completely attached to the corresponding cantilever foil 3, and the adjacent cantilever foils 3 are partially in surface contact at the extension lap joint part. At this time, the multiple nonlinear stiffness characteristics formed by the complete deformation of the elastic supporting element 2 and the large deformation between the adjacent cantilever foils 3 serve as an elastic supporting function, and the supporting function formed by the complete adhesion of the elastic supporting element 2 and the corresponding elastic supporting element 2 serves as a main supporting function for the multiple nonlinear stiffness characteristics.
In the invention, the maximum value and the minimum value of the interval of the first load range, the second load range and the third load range are gradually increased in sequence. Under different working conditions, the first load range, the second load range, and the third load range may change greatly, and need to be determined specifically according to actual conditions, for example, as follows:
when the parameters carried by the cantilever-type radial foil shaft are configured as: the number of the cantilever foils is M, and the opening angle of the cantilever foils isWherein M is a natural number. The thicknesses of the cantilever foil and the two layers of bubbling foils as the elastic supporting elements are both 0.1 mm, and the thicknesses of the cantilever foil and the two layers of bubbling foils as the elastic supporting elementsThe material of the sheet is beryllium bronze, and the bubbling height of the two layers of bubbling foils is 0.2 mm; the bubbles of the two layers of bubble foils are arranged in rows along the circumferential direction and are arranged in sequence along the axial direction, 5 rows of bubbles are adopted in the axial direction, and 21 rows of bubbles are adopted in the circumferential direction. Under the working condition, the first load range is more than 0N and less than or equal to 5N, the second load range is more than 5N and less than or equal to 20N, and the third load range is more than 20N; wherein T is the load of the cantilever-type radial foil bearing; where N represents the force in newtons.
When the parameters carried by the cantilever-type radial foil shaft are configured as: the number of the cantilever foils is 4, and the opening angle of the cantilever foils is 120 degrees; the thicknesses of the cantilever foil and the two layers of bubbling foils serving as the elastic supporting elements are both 0.1 mm, the materials of the cantilever foil and the two layers of bubbling foils serving as the elastic supporting elements are both stainless steel, and the bubbling heights of the two layers of bubbling foils are 0.2 mm; the bubbles of the two layers of bubble foils are arranged in rows along the circumferential direction and are arranged in sequence along the axial direction, 5 rows of bubbles are adopted in the axial direction, and 21 rows of bubbles are adopted in the circumferential direction. Under the working condition, the first load range is more than 0N and less than or equal to 4N, the second load range is more than 4N and less than or equal to 15N, and the third load range is more than or equal to 15N.
When the parameters carried by the cantilever-type radial foil shaft are configured as: the number of the cantilever foils is 4, and the opening angle of the cantilever foils is 120 degrees; the thicknesses of the cantilever foil and the two layers of bubbling foils serving as the elastic supporting elements are both 0.15 mm, the materials of the cantilever foil and the two layers of bubbling foils serving as the elastic supporting elements are both beryllium bronze, and the bubbling heights of the two layers of bubbling foils are 0.2 mm; the bubbles of the two layers of bubble foils are arranged in rows along the circumferential direction and are arranged in sequence along the axial direction, 5 rows of bubbles are adopted in the axial direction, and 21 rows of bubbles are adopted in the circumferential direction. Under the working condition, the first load range is more than 0N and less than or equal to 8N, the second load range is more than 8N and less than or equal to 40N, and the third load range is more than or equal to 40N.
The above examples of different working conditions are only some of the experimental working conditions, and the present invention includes the above working conditions, but is not limited to the above working conditions.
In the invention, the cantilever foil and the elastic supporting element are made of beryllium bronze, stainless steel or nickel-based alloy and the like. In practical applications, the materials of the cantilever foils and the elastic support element can be determined according to actual requirements.
In the invention, the extending direction of the cantilever foil and the elastic supporting element is the same as the shaft rotating direction of the cantilever type radial foil bearing.
In the invention, the elastic supporting element 2 is a multilayer bubbling foil or a bump foil, the thickness of the multilayer bubbling foil is greater than or equal to 0.05 mm, and the bubbling height of the multilayer bubbling foil is greater than or equal to 0.15 mm. Fig. 5(a) is a schematic structural view of the support member with equal height elasticity. Fig. 5(b) is a schematic structural view of the high elastic support member. As shown in fig. 5(a), 5(b), in the present invention, the heights of the elastic supporting members 2 are equal from the fixed ends to the free ends of the elastic supporting members 2; alternatively, the height of the elastic support element 2 is from low to high from the fixed end to the free end of the elastic support element 2.
In practical application, the cantilever type radial foil bearing can optimize the wedge-shaped gap in the bearing by changing the structural characteristics of the elastic supporting element 2, so that the bearing capacity is improved, the bearing is ensured to have better stability and impact resistance under large impact load, and the problem of foil abrasion of the traditional cantilever type radial foil bearing under heavy load and impact load is solved. When the wave foil is adopted as the elastic supporting element, the changeable structural parameters comprise the thickness of the wave foil, the radius of the wave arch, the number of the wave arches in unit length, the angle of the wave arch and the like; when multiple layers of blister foils are used as the flexible support member, the structural parameters that may be varied include the thickness of the blister foil, the number of layers of blister foil, the number of blisters per unit area, the arrangement of the blisters in rows or columns, the shape of the blisters, the height of the blisters, etc.
In the invention, the cantilever foil 3 and the elastic supporting element 2 are made of beryllium bronze, nickel-based alloy or stainless steel, and the thickness of the cantilever foil 3 is 0.05 mm. In practical application, the materials of the cantilever foils and the elastic supporting element can be determined according to actual requirements.
In the present invention, the number of the cantilever foils 3 is 4, and the opening angle of the cantilever foils 3 is 120 °.
In practical application, the elastic support elements corresponding to different clamping grooves can adopt different structural parameters to control the rigidity of the cantilever type radial foil bearing under large load, further optimize the wedge-shaped gap in the bearing to enlarge the bearing area, and further improve the bearing capacity of the bearing. In addition, each clamping groove can also correspond to a plurality of elastic supporting elements, the structural rigidity of the bearing has the characteristics of small rigidity at two ends and large rigidity in the middle along the axial direction by controlling the rigidity distribution of the elastic supporting elements, and the bearing capacity of the bearing is further improved. The characteristic that the rigidity of the two ends is small and the rigidity of the middle part is large can be realized by the following modes: when the elastic supporting element adopts the bump foil, the middle sheet of the bump foil in the axial direction can adopt a foil sheet with larger thickness or a mode that the number of bump arches in unit length is larger; when the elastic supporting element adopts a plurality of layers of bubbling foils, the middle area in the axial direction of the bubbling foils can adopt a mode of arranging more bubbling than the areas at two ends, different bubbling shapes or the thickness of the foils in the middle area is larger, and the like.
Experiments show that the cantilever type radial foil bearing with the shaft diameter of 25 mm adopts the double-layer bubbling foil as the elastic supporting element, and the main frequency amplitude of the cantilever type radial foil bearing is only about one third of that of the traditional cantilever type radial foil bearing under the same parameters under the conditions of the rotating speed of 80 kilorevolutions per minute and the load of 15N. This shows that the cantilever type radial foil bearing of the present invention has better capabilities of dissipating vortex energy and keeping the main shaft stably running. Meanwhile, at a rotating speed of 80 krpm/min and 80krpm, the ultimate bearing capacity measured by the cantilever radial foil bearing is improved by about 30 percent compared with that of the traditional cantilever radial foil bearing under the same parameters.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A cantilever-type radial foil bearing, comprising: the device comprises a bearing seat, more than three elastic supporting elements and more than three cantilever foils; wherein,
more than three axial clamping grooves are uniformly formed in the inner wall of the bearing seat along the circumferential direction, the number of the elastic supporting elements and the number of the cantilever foils are the same as the number of the clamping grooves, and one clamping groove corresponds to one elastic supporting element and one cantilever foil; sequentially installing corresponding elastic supporting elements and cantilever foils in the bearing seat from outside to inside, wherein one ends of the elastic supporting elements and one ends of the cantilever foils are used as fixed ends and are overlapped and fixed in corresponding clamping grooves through pins, the other ends of the elastic supporting elements and the other ends of the corresponding cantilever foils are used as free ends and are in a free state, and the other end of each cantilever foil is freely lapped on an adjacent cantilever foil along the circumferential direction; the elastic supporting element is attached to the inner wall of the bearing seat, the elastic supporting element is in line contact or surface contact with the corresponding cantilever foils, and adjacent cantilever foils are in segmented line contact or surface contact.
2. The cantilever-type radial foil bearing of claim 1, wherein the resilient support element is in line-or surface-contact with a corresponding cantilever foil, and adjacent cantilever foils are in segmented line-or surface-contact, in particular:
when the cantilever type radial foil bearing is in no-load, the elastic supporting element is in line contact with the corresponding cantilever foil close to the fixed end, the elastic supporting element is not in line contact with the other parts of the corresponding cantilever foil except the fixed end, and the adjacent cantilever foils are in line contact at the free lap joint;
when the load of the cantilever type radial foil bearing is in a first load range, the elastic supporting element is in line contact with the corresponding cantilever foil close to the fixed end, the elastic supporting element is not in line contact with the corresponding cantilever foil at the other parts except the fixed end, and the adjacent cantilever foils are in line contact at the extension lap joint part;
when the load T of the cantilever type radial foil bearing is in a second load range, the elastic supporting element is partially in surface contact with the corresponding cantilever foils from the fixed end, and the adjacent cantilever foils are partially in surface contact at the extension lap joint part;
when the load of the cantilever type radial foil bearing is in a third load range, the elastic supporting element is completely attached to the corresponding cantilever foil, and the adjacent cantilever foils are partially in surface contact at the extension lap joint part;
where N represents the force in newtons.
3. The cantilever-type radial foil bearing of claim 1 or 2, wherein the elastic support element is a multi-layer blister foil or a bump foil, and the thickness of the multi-layer blister foil is greater than or equal to 0.05 mm, and the blister height of the multi-layer blister foil is greater than or equal to 0.15 mm.
4. The cantilever-type radial foil bearing of claim 3, wherein the resilient support elements are of equal height from a fixed end to a free end of the resilient support elements.
5. The cantilever-type radial foil bearing of claim 3, wherein the height of the resilient support element is from low to high from a fixed end to a free end of the resilient support element.
6. The cantilever-type radial foil bearing of any one of claims 1 to 5, wherein the cantilever foil and the resilient support element are beryllium bronze, nickel-based alloy or stainless steel, and the cantilever foil has a thickness of 0.05 mm or more.
7. The cantilever-type radial foil bearing of claim 6, wherein the cantilever foil has an opening angle ofWherein M represents the number of the cantilever foils, and M is a natural number.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810939744.8A CN108916217B (en) | 2018-08-12 | 2018-08-12 | Cantilever type radial foil bearing |
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|---|---|---|---|
| CN201810939744.8A CN108916217B (en) | 2018-08-12 | 2018-08-12 | Cantilever type radial foil bearing |
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| CN108916217B CN108916217B (en) | 2024-09-06 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110067808A (en) * | 2019-05-13 | 2019-07-30 | 大连理工大学 | A kind of air hydrodynamic foil bearing paillon fixed structure of cylinder pin type |
| CN110131301A (en) * | 2019-05-13 | 2019-08-16 | 大连理工大学 | A kind of air hydrodynamic foil bearing paillon fixed structure of cuboid peg type |
| CN111305911A (en) * | 2020-02-25 | 2020-06-19 | 东南大学 | Elastic foil composite cylindrical surface texture sealing device |
| CN113513594A (en) * | 2021-05-20 | 2021-10-19 | 中国计量大学 | Foil end face air film sealing structure with dynamic pressure floating sealing dam |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110067808A (en) * | 2019-05-13 | 2019-07-30 | 大连理工大学 | A kind of air hydrodynamic foil bearing paillon fixed structure of cylinder pin type |
| CN110131301A (en) * | 2019-05-13 | 2019-08-16 | 大连理工大学 | A kind of air hydrodynamic foil bearing paillon fixed structure of cuboid peg type |
| CN111305911A (en) * | 2020-02-25 | 2020-06-19 | 东南大学 | Elastic foil composite cylindrical surface texture sealing device |
| CN113513594A (en) * | 2021-05-20 | 2021-10-19 | 中国计量大学 | Foil end face air film sealing structure with dynamic pressure floating sealing dam |
| CN113513594B (en) * | 2021-05-20 | 2024-03-19 | 中国计量大学 | Foil end face air film sealing structure with dynamic pressure floating sealing dam |
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