CN202140419U

CN202140419U - Dynamic pressure gas radial ceramic bearing

Info

Publication number: CN202140419U
Application number: CN2011202053147U
Authority: CN
Inventors: 罗立峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-05-27
Filing date: 2011-06-17
Publication date: 2012-02-08
Anticipated expiration: 2021-06-17

Abstract

The utility model discloses a dynamic pressure gas radial ceramic bearing which comprises a ceramic bearing outer sleeve and a ceramic bearing inner sleeve, wherein the ceramic bearing inner sleeve is positioned in the ceramic bearing outer sleeve, an excircle of the ceramic bearing outer sleeve is provided with grooves which are distributed uniformly and concave holes which are distributed uniformly, an excircle and two ends of the ceramic bearing inner sleeve are provided with groove-type patterns with regular shape, and an inner circle of the ceramic bearing inner sleeve is provided with grooves which are distributed uniformly. As carbide ceramic matrix composite materials are selected as a manufacturing material of bearings, the ceramic bearing has the characteristics of being simple in structure, convenient to use, low in economic cost, strong in practical performance, easy for industrial implementation and the like. As the groove-type patterns with regular shape are machined at the excircle and the two ends of the ceramic bearing inner sleeve, dynamic pressure gas which is produced continuously can be better kept in a fit clearance of an inner circle of the ceramic bearing outer sleeve and the excircle of the ceramic bearing inner sleeve under the driving of the high-speed gyration shaft, and an air film which is needed to support the bearing functions of a high-speed running shaft can be formed, so that certain stability and loading capability can be realized.

Description

Kinetic pressure gas is ceramic bearing radially

Technical field

The utility model relates to radially ceramic bearing of a kind of high rigidity kinetic pressure gas that can support the high speed rotary axle.

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, also need not use lubricating oil, therefore on the high speed rotary application, be widely used, be used in the ultra-high speed applications field and the difficult lubricating oil place that uses that are difficult to the rolling bearing support especially usually.

The direction that hydrodynamic gas-lubricated bearing is pressed bearing load is different, 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.Several kinds of comparatively common kinetic pressure gas radial bearing structural types have at present: watt formula of can inclining, slot type and paillon foil formula.

Watt formula radial dynamic pressure gas bearing that can incline is a kind of hydrodynamic gas-lubricated bearing of function admirable; Has self-regulation performance; Can be in littler 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, bearing capacity is high, 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, mounting process is complicated, and 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 material manufacture technology and the technology, so the application of foil bearing also is restricted.

It is fine with paillon foil formula kinetic pressure gas radial bearing stability though can incline watt,, 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 at a 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 purpose of the utility model provides a kind of high rigidity that can support the high speed rotary axle and reliable performance, the life-span is permanent and weight light and handy and excellent properties such as low cost of manufacture, and the selfsealings kinetic pressure gas that can implement industrialization ceramic bearing radially.It not only can solve to have now can incline watt formula radial dynamic pressure gas bearing on bearing shell structure and mounting process; Since too a complicated difficult problem caused like 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 like expensive, performance that technical barrier caused.

To achieve these goals, the utility model is to have selected the raw material of the anti-carbide ceramics based composites that physical property is excellent, cost is low such as wear-resisting, high temperature resistant as bearing for use at material at first.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, like the high-speed electric expreess locomotive bearing.

The purpose of the utility model is achieved through taking following technological scheme:

A kind of kinetic pressure gas is ceramic bearing radially; It is characterized in that; Comprise cover in ceramic bearing overcoat and the ceramic bearing; Cover is arranged in the ceramic bearing overcoat in the described ceramic bearing, and the cylindrical of described ceramic bearing overcoat has equally distributed groove and equally distributed shrinkage pool, and the cylindrical of cover and two ends have regular shape in the described ceramic bearing slot type decorative pattern, interior circle have equally distributed groove.

Cover all uses the carbide ceramics based composites to be prepared from described ceramic bearing overcoat and the ceramic bearing.

The cylindrical of described ceramic bearing overcoat has three equally distributed grooves and three equally distributed shrinkage pools, and described shrinkage pool is arranged between the groove at interval.

Three of the interior circles of cover have equally distributed groove in the described ceramic bearing.

Cover is 0.001～0.008mm with the matching gap of ceramic bearing overcoat in the described ceramic bearing.

The utlity model has following beneficial effect:

(1) the utility model is owing to selected the manufactured materials of carbide ceramics based composites as bearing for use; Through the characteristics of selflubricating that material self had, anti-superior physical properties such as wear-resisting, high temperature resistant, thus the kinetic pressure gas of the utility model radially ceramic bearing have simple in structure, easy for installation, financial cost is cheap, practical, characteristics such as industrialized implementation is easy.

(2) the utility model is because the slot type decorative pattern that cylindrical that in ceramic bearing, overlaps and two ends all are processed with regular shape; So under the drive of high speed rotary axle; The kinetic pressure gas that produces continuously can remain in the matching gap of cover cylindrical in interior circle of ceramic bearing overcoat and the ceramic bearing preferably; And form the supporting required air film of axle bearing function that runs up, thereby realize having certain stability and load-carrying ability.

Description of drawings

Fig. 1 is the utility model embodiment's a plan view,

Fig. 2 is the utility model embodiment's a side view,

Fig. 3 is the A-A sectional drawing of Fig. 2.

Embodiment

Shown in Fig. 1-3; The utility model embodiment's kinetic pressure gas is ceramic bearing radially, comprises the interior cover 2 of ceramic bearing overcoat 1 and ceramic bearing, and cover 2 is assemblied in the ceramic bearing overcoat 1 in the ceramic bearing; The cylindrical of cover 2 is provided with the slot type decorative pattern of regular shape (like the impeller shape) in the ceramic bearing; The slot type decorative pattern of this regular shape makes in ceramic bearing overcoat 1 and the ceramic bearing and forms wedge shape space between the cover 2, and when the 2 relative ceramic bearing overcoats 1 of cover in the ceramic bearing rotated, gas was driven because of the viscous effect of himself; And be compressed in the wedge gap, produce kinetic pressure thus and 2 rotations of supporting ceramic bearing inner sleeve.

The cylindrical of ceramic bearing overcoat 2 has three equally distributed grooves 3 and three equally distributed shrinkage pools 4; Three equally distributed shrinkage pools 4 are arranged between three equally distributed grooves 3 at interval, and the interior circle of cover 2 has three equally distributed grooves 5 in the ceramic bearing.Like this kinetic pressure gas radially in ceramic bearing overcoat 1 and the ceramic bearing of ceramic bearing cover 2 can be connected with bearing support and turning axle through key respectively and fixedly mount; Simultaneously can keep the kinetic pressure gas radially dynamic balancing and the static balancing of ceramic bearing, radially the ceramic bearing running is more steady to make kinetic pressure gas.Ceramic bearing overcoat 1 all uses the carbide ceramics based composites to be prepared from the interior cover 2 of ceramic bearing.Cover 2 is 0.001～0.008mm with the matching gap of ceramic bearing overcoat 1 in the ceramic bearing.

The utility model kinetic pressure gas radially ceramic bearing is fixedly mounted on the high speed rotary axle through cover 2 in the ceramic bearing; Under the drive of high speed rotary axle; The kinetic pressure gas that produces continuously can remain in the matching gap of cover 2 cylindricals in ceramic bearing overcoat 1 interior circle and the ceramic bearing preferably; And forming the supporting 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.

Claims

1. kinetic pressure gas ceramic bearing radially; It is characterized in that; Comprise cover (2) in ceramic bearing overcoat (1) and the ceramic bearing; Cover (2) is arranged in ceramic bearing overcoat (1) in the described ceramic bearing, and the cylindrical of described ceramic bearing overcoat (1) has equally distributed groove (3) and equally distributed shrinkage pool (4), and cylindrical and the slot type decorative pattern that two ends have regular shape, the interior circle of cover (2) have equally distributed groove (5) in the described ceramic bearing.

2. kinetic pressure gas according to claim 1 is ceramic bearing radially, it is characterized in that, cover (2) all uses the carbide ceramics based composites to be prepared from described ceramic bearing overcoat (1) and the ceramic bearing.

3. kinetic pressure gas according to claim 2 is ceramic bearing radially; It is characterized in that; The cylindrical of described ceramic bearing overcoat (1) has three equally distributed grooves (3) and three equally distributed shrinkage pools (4), and described shrinkage pool (4) is arranged between the groove (3) at interval.

4. kinetic pressure gas according to claim 2 is ceramic bearing radially, it is characterized in that, three of the interior circles of cover (2) have equally distributed groove (5) in the described ceramic bearing.

5. according to each described kinetic pressure gas of claim 1-4 ceramic bearing radially, it is characterized in that cover (2) is 0.001～0.008mm with the matching gap of ceramic bearing overcoat (1) in the described ceramic bearing.