CN202091350U

CN202091350U - Self-sealing dynamic-pressure gas radial ceramic bearing

Info

Publication number: CN202091350U
Application number: CN2011201880246U
Authority: CN
Inventors: 罗立峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-06-07
Filing date: 2011-06-07
Publication date: 2011-12-28
Anticipated expiration: 2021-06-07

Abstract

The utility model discloses a self-sealing dynamic-pressure gas radial ceramic bearing, comprising an external sleeve and an internal sleeve in clearance fit with one another. A large seal stop ring is fixed at each of two ends of the external sleeve, two ends of the internal sleeve are respectively provided with a small seal stop ring, and the peripheral wall and the two ends of the internal sleeve are respectively provided with a trench type decorative pattern with a regular shape. The dynamic-pressure gas radial ceramic bearing is fixedly disposed on a high-speed rotating shaft by the internal sleeve, continuously-generated dynamic-pressure gas can be preferably kept in a fit clearance between the external sleeve and the internal sleeve under the drive of the high-speed rotating shaft so as to form a gas film required for supporting the function of a bearing of the high-speed rotating shaft, and the large seal stop rings and the small seal stop rings provide the seal function required by the gas film to play a part in self sealing, i.e. to realize the performance of seal sealing, so that the function of the dynamic-pressure gas radial ceramic bearing with a certain stability and load capacity can be realized.

Description

The selfsealings kinetic pressure gas is ceramic bearing radially

Technical field

The utility model relates to technical field of bearings, relates in particular to the kinetic pressure gas radial bearing.

Background technique

Bearing can be divided into rolling bearing (use ball or roller), oilless bearing (use the lubricity material to rub and move), sliding bearing (using oil), gas bearing and magnetic bearing (utilizing magnetic force to do contactless action).Sliding bearing is divided into hydrodynamic bearing and hydrodynamic journal liquid polymers again, and wherein hydrodynamic bearing is that nationality comes supporting axis by slide relative motion generation oil pressure; Hydrodynamic journal liquid polymers are to come supporting axis through the high pressure oil that the bearing outside provides.Gas bearing is except using gases replaces oil, and other operating principles are identical with sliding bearing.Hydrostatic gas-lubricated bearing provides superheated steam from the outside; Move and produce pressure and hydrodynamic gas-lubricated bearing is a slide relative.

Hydrodynamic gas-lubricated bearing is as oiling agent with gas, between axle and bearing, constitute air film, the bearing type that to be all-moving surface directly do not contact with stationary face, and have pollution-free, frictional loss is low, the adaptive temperature scope wide, running steadily, service time plurality of advantages such as length, working speed height.Because frictional loss is few, does not also need to use lubricating oil, therefore on the high speed rotary application, be widely used, be used in the ultra-high speed applications field and the inconvenience that are difficult to support especially usually and use the lubricating oil place with rolling bearing.

Hydrodynamic gas-lubricated bearing is pressed the direction difference of bearing load, is divided into kinetic pressure gas radial bearing, kinetic pressure gas thrust-bearing and kinetic pressure gas radial thrust combination bearing again.

The kinetic pressure gas radial bearing is to form wedge shape space by two working surfaces that relatively move, and when they relatively move, gas is driven because of the viscous effect of himself, and is compressed in the wedge gap, produces kinetic pressure thus and bearing load.The gas dynamic pressure radial bearing of different structure form is owing to structural difference, and its working procedure is slightly different.Comparatively common several kinetic pressure gas radial bearing structural types have at present: watt formula of can inclining, slot type and paillon foil formula.

Three tilting-pad radial dynamic pressure gas bearings are hydrodynamic gas-lubricated bearings of a kind of function admirable, has self-regulation performance, can be in littler minimum air film interstice coverage trouble free service, insensitive to thermal distortion, resiliently deformable etc., and the machining accuracy assurance that is easy to get, also the variation to load has the outstanding advantage of " from motion tracking ".Because its good stability, the bearing capacity height is mainly used in large high-speed rotating machinery and turbomachinery at present both at home and abroad.But its bearing shell structure more complicated, the mounting process complexity, general radial bearing requires high, thereby has limited its application.

Have performances such as yielding support, good stability though the paillon foil formula is radial gas bearing provided, but because the general employing of foil bearing is tinsel, also there are some difficult problems on its made technology and the technology, so the application of foil bearing also is restricted.

Though can incline watt and paillon foil formula kinetic pressure gas radial bearing stability fine,, the processing technology more complicated, practical application at present still has certain difficulty.

The slot type bearing has stability preferably, even certain stability is also arranged under zero load, moreover, under high speed, its static bearing capacity is big than the bearing of other form, be used on the miniature high-speed rotating machinery at present more, as in the precision optical machinery of gyroscope and magnetic drum and so on as bearing.

The model utility content

The technical problems to be solved in the utility model provides a kind ofly has excellent properties such as the light and handy and low cost of manufacture of permanent, simple in structure, weight of high rigidity, reliable performance, the life-span that can support the high speed rotary axle, and the selfsealings kinetic pressure gas that can realize industrialization ceramic bearing radially.

The technological scheme that adopts for solving the problems of the technologies described above: a kind of selfsealings kinetic pressure gas is ceramic bearing radially, include the overcoat and the interior cover of gap fit, it is characterized in that: the two ends of described overcoat all are fixed with big sealing stop ring, the two ends of cover all dispose little sealing stop ring in described, and the periphery wall and the two ends of described interior cover all have regular shape slot type decorative pattern.Kinetic pressure gas radially ceramic bearing is fixedly mounted on the high speed rotary axle by interior cover, under the drive of high speed rotary axle, the kinetic pressure gas that produces can remain in the matching gap of overcoat and interior cover preferably continuously, form and support the required air film of axle bearing function that runs up, and provide air film required sealing function by big sealing stop ring and little sealing stop ring, play self sealing action, promptly have the selfsealings performance, thus the kinetic pressure gas of realizing having certain stability and load-carrying ability ceramic bearing function radially.

On the basis of the above, described in the slot type decorative pattern at cover two ends be symmetrical arranged, described slot type decorative pattern is the impeller shape evenly to be laid, every groove extends to cylindrical by the interior circle of interior cover always.Under the drive of high speed rotary axle, impeller shape groove can produce more kinetic pressure gas and press in the matching gap of overcoat and interior cover, forms the more air film of high pressure.

Can be preferably, described overcoat, interior cover, seal stop ring and little sealing stop ring greatly and all adopt the carbide ceramics based composites to prepare to process.The carbide ceramics based composites is a kind of stupalith with low cost, convenient and practical, in light weight, excellent anti friction wear, performance such as high temperature resistant, it not only can be applied in novel space flight and aviation motor, also can be widely used in military fields such as aircraft, cruise missile, antiaircraft missile and intercontinental missile, can also be applied to support the bearing on the high speed rotary axle, as the high-speed electric expreess locomotive bearing.

On the basis of the above, the two ends of described overcoat all are formed with groove, all are fixed with described big sealing stop ring in the described groove.Cover is 0.001～0.008mm with the matching gap of overcoat in described.

On the basis of the above, the inner circle wall of described interior cover offers three equally distributed grooves; The periphery wall of described overcoat offers three equally distributed grooves and three equally distributed shrinkage pools.The overcoat of bearing can be connected and bearing support and turning axle fixed installation by key respectively with interior cover like this, can realize bearing dynamic balancing and static balancing easily simultaneously.

Adopt the beneficial effect that the utility model brought: kinetic pressure gas of the present utility model radially ceramic bearing have simple in structure, easy for installation, financial cost is cheap, practical, industrialized implementation is easy.It not only can solve existing three tilting-pad radial dynamic pressure gas bearings on bearing shell structure and mounting process, since too complicated caused as difficult serial problems that realizes of industrialization such as expensive, poor benefits, simultaneously also solved aerodynamic elastic foil bearing on material preparation technology and technology, because the too much serial problem that does not reach the difficult realizations of industrialization such as designing requirement as expensive, performance that technical barrier caused.

Description of drawings

Fig. 1 is the radially overall structure schematic representation of ceramic bearing of the utility model selfsealings kinetic pressure gas;

Fig. 2 is the radially side structure schematic representation of ceramic bearing of the utility model selfsealings kinetic pressure gas;

Fig. 3 is the A-A sectional view of Fig. 2;

Fig. 4 is the B-B sectional view of Fig. 3.

Embodiment

Shown in Fig. 1-4, a kind of selfsealings kinetic pressure gas is ceramic bearing radially, includes the overcoat 1 and the interior cover 2 of gap fit, and interior cover 2 is 0.001～0.008mm with the matching gap of overcoat 1.The periphery wall of interior cover 2 is provided with regular shape slot type decorative pattern, this regular shape slot type decorative pattern makes between overcoat 1 and the interior cover 2 and forms wedge shape space, when interior cover 2 when overcoat 1 rotates, gas is driven because of the viscous effect of himself, and be compressed in the wedge gap, produce kinetic pressure thus and cover 2 rotations in supporting.In the slot type decorative pattern at cover 2 two ends be symmetrical arranged, the slot type decorative pattern is the impeller shape evenly to be laid, every groove 21 extends to cylindrical by the interior circle of interior cover 2 always.Under the drive of high speed rotary axle, impeller shape groove 21 can produce more kinetic pressure gas and press in the matching gap of overcoat 1 and interior cover 2, forms the more air film of high pressure.The two ends of overcoat 1 all are formed with groove 11, all are fixed with big sealing stop ring 3 in the groove 11, and the matching gap of overcoat 1 with interior cover 2 sealed.4 of little sealing stop rings by be fixed on be configured on the turning axle in the two ends of cover 2, form certain enclosed space with impeller shape groove 21.Kinetic pressure gas radially ceramic bearing is fixedly mounted on the high speed rotary axle by interior cover 2, under the drive of high speed rotary axle, the kinetic pressure gas that produces can remain in the matching gap of overcoat 1 and interior cover 2 preferably continuously, form and support the required air film of axle bearing function that runs up, air film makes bearing stable running of high speed under pneumatically supported state promptly as kinetic pressure gas radial bearing oiling agent.And provide air film required sealing function by big sealing stop ring 3 and little sealing stop ring 4, and play self sealing action, promptly have the selfsealings performance, thus the kinetic pressure gas of realizing having certain stability and load-carrying ability ceramic bearing function radially.

For make kinetic pressure gas radially ceramic bearing possess excellent anti-wear wearing and tearing, heat-resisting quantity, overcoat 1, interior cover 2, seal stop ring 3 and little sealing stop ring 4 greatly and all adopt the carbide ceramics based composites to prepare to process.It not only can be applied in novel space flight and aviation motor, also can be widely used in military fields such as aircraft, cruise missile, antiaircraft missile and intercontinental missile, can also be applied to support the bearing on the high speed rotary axle, as the high-speed electric expreess locomotive bearing.

The inner circle wall of interior cover 2 offers three equally distributed grooves 22, and the periphery wall of overcoat 1 offers three equally distributed grooves 12 and three equally distributed shrinkage pools 13 simultaneously.The overcoat 1 of bearing can be connected and bearing support and turning axle fixed installation by key respectively with interior cover 2 like this, can keep the dynamic balancing and the static balancing of bearing simultaneously, makes bearing operation more steady.

Claims

1. selfsealings kinetic pressure gas ceramic bearing radially, include the overcoat and the interior cover of gap fit, it is characterized in that: the two ends of described overcoat all are fixed with big sealing stop ring, the two ends of cover all dispose little sealing stop ring in described, and the periphery wall and the two ends of described interior cover all have regular shape slot type decorative pattern.

2. a kind of selfsealings kinetic pressure gas as claimed in claim 1 is ceramic bearing radially, it is characterized in that: the slot type decorative pattern at cover two ends is symmetrical arranged in described, and described slot type decorative pattern is the impeller shape evenly to be laid, and every groove extends to cylindrical by the interior circle of interior cover always.

3. a kind of selfsealings kinetic pressure gas as claimed in claim 1 is ceramic bearing radially, it is characterized in that: described overcoat, interior cover, seal stop ring and little sealing stop ring greatly and all adopt the carbide ceramics based composites to prepare to process.

4. a kind of selfsealings kinetic pressure gas as claimed in claim 1 is ceramic bearing radially, and it is characterized in that: the two ends of described overcoat all are formed with groove, all is fixed with described big sealing stop ring in the described groove.

5. a kind of selfsealings kinetic pressure gas as claimed in claim 1 is ceramic bearing radially, it is characterized in that: cover is 0.001～0.008mm with the matching gap of overcoat in described.

6. a kind of selfsealings kinetic pressure gas as claimed in claim 1 is ceramic bearing radially, it is characterized in that: the inner circle wall of cover offers three equally distributed grooves in described; The periphery wall of described overcoat offers three equally distributed grooves and three equally distributed shrinkage pools.