CN104703373A - A bearing device for a rotor of a frame of an imaging medical instrument - Google Patents
A bearing device for a rotor of a frame of an imaging medical instrument Download PDFInfo
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- CN104703373A CN104703373A CN201410737029.8A CN201410737029A CN104703373A CN 104703373 A CN104703373 A CN 104703373A CN 201410737029 A CN201410737029 A CN 201410737029A CN 104703373 A CN104703373 A CN 104703373A
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- 238000002059 diagnostic imaging Methods 0.000 claims abstract 5
- 238000007789 sealing Methods 0.000 claims description 36
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- 230000002706 hydrostatic effect Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 230000036961 partial effect Effects 0.000 claims description 2
- 239000012530 fluid Substances 0.000 abstract description 43
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 description 14
- 238000013170 computed tomography imaging Methods 0.000 description 9
- 239000000314 lubricant Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 7
- 238000005286 illumination Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 238000005461 lubrication Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 238000002591 computed tomography Methods 0.000 description 3
- 238000011109 contamination Methods 0.000 description 3
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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
- F16C32/00—Bearings not otherwise provided for
- F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
- F16C32/0629—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion
- F16C32/064—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion the liquid being supplied under pressure
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computed tomography [CT]
- A61B6/032—Transmission computed tomography [CT]
- A61B6/035—Mechanical aspects of CT
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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
- F16C32/00—Bearings not otherwise provided for
- F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
- F16C32/0629—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion
- F16C32/0633—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion the liquid being retained in a gap
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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
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/80—Labyrinth sealings
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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
- F16C2316/00—Apparatus in health or amusement
- F16C2316/10—Apparatus in health or amusement in medical appliances, e.g. in diagnosis, dentistry, instruments, prostheses, medical imaging appliances
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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
- F16C32/00—Bearings not otherwise provided for
- F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
- F16C32/0603—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion
- F16C32/0614—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion the gas being supplied under pressure, e.g. aerostatic bearings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medical Informatics (AREA)
- Radiology & Medical Imaging (AREA)
- Molecular Biology (AREA)
- Biophysics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Optics & Photonics (AREA)
- Pathology (AREA)
- Physics & Mathematics (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- High Energy & Nuclear Physics (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Theoretical Computer Science (AREA)
- Pulmonology (AREA)
- Apparatus For Radiation Diagnosis (AREA)
Abstract
The invention relates to a frame (2) of a medical imaging device. The frame (2) of the medical imaging device is provided with a fluid bearing (15). The device is provided with a stator (3), a rotor (4), a detection unit installed on the rotor (4) and a fluid bearing (15). The fluid bearing has a gap (17) between the stator (3) and the rotor (4). The rotor (4) is supported relative to the stator (3) with the gap (17). Additional supporting bearings (22) are arranged in the lower area of the rotor (4) and/or near the lower area of the rotor. The supporting bearings (22) support the rotor in a static period and in starting and ending of rotation of the rotor (4).
Description
Technical field
The present invention relates to a kind of frame of imaging modality, there is stator, rotor, be arranged on epitrochanterian probe unit, FDB, this FDB have gap between the stator and the rotor and rotor is supported with this gap relative stator.In addition, the present invention relates to a kind of stator supporting rotor for hydrodynamic pressure and/or the hydrostatically relative frame of imaging modality, wherein, there is the rotor of probe unit, stator and FDB and be arranged to, make to form gap between the stator and the rotor and rotor relative stator is supported.
Background technology
The tomograph of the three-dimensional of the inside of check object can be produced by X-ray mode in computer tomography equipment.Generate the X-ray tomograph of two dimension by probe unit (it has the X source and photographic system that usually rotate around supporting object), by this X-ray tomograph reconstruction of three-dimensional tomograph for this reason.So-called function element is rotatably supported on frame housing around system axle, and this frame casing annular ground is arranged around the spatial accommodation of check object.Frame is called as below the single unit system be made up of probe unit, bearing and frame housing.
X source, photographic system and their control system (being arranged in frame) are arranged in the rotating cylinder of so-called tubbiness device usually, it is connected with rotor or self forms rotor, wherein, rotating cylinder is placed in the rotary state around system axis, to obtain the X-ray of photograph subject from all directions.
The rotating cylinder be equipped with reaches the weight (in single origin system, namely having the system of X source) of roughly 800 to 900Kg usually.
In order to take x-ray image, the check object spatial accommodation that X source is centered around when radioactivity is taken in frame housing usually consistently rotates, and rotary speed is 240 rpms to the maximum.
An important object is, patient shines X-ray as far as possible in short time, for keeping less exposure.But rotation duration short as far as possible must be realized, that is also therefore the speed of rotating cylinder is high as far as possible to realize radiographic source for this reason.
In addition, whole rotary unit must tilt forward and backward around longitudinal axis with the angle of 30 °.
Because the friction occurred when rotating cylinder or rotor rotate can cause heat-dissipating and mechanical wear, by frame or rotor, the supporting arrangement in frame housing is minimized usually for it.Bearing for this reason used is also referred to as swivel bearing and be the important parts of frame.Rolling bearing is used to this parts traditionally.But wherein occur that following requirement will meet: as has been described, modern CT systems runs in the range of speeds and loading range, it may causing trouble owing to wearing and tearing.Rolling bearing must be maintained.This is usually by lubricating realization again.In addition rolling bearing also can be subject to certain wearing and tearing, and this adversely have impact on system lifetim.In addition along with rotating speed increases, noise level also increase for, make it especially can disturb patient and must be reduced by additional measure.In addition, rolling bearing is very sensitive for contamination particle, and it can damage the raceway of ball and reduce running time or the life-span of bearing.Thus, bearing must be protected, because larger collision or lasting vibration can damage or even damage bearing especially when transporting.
In order to reduce the higher noise level of bearing and be therefore reduced to acceptable level under higher rotation speed, then must pay higher manufacture and assembling expends.The life-span of bearing is subject to the wearing and tearing restriction of contact and bearing in addition.As previously mentioned, enter in bearing and that point-like improves contact pollutant and also can reduce the life-span.Scheme for addressing this is that is, notes the process that cleans and uses for by the sealing device of relative for rolling bearing contamination particle sealing or labyrinth-type excluder constructing with using during rolling bearing.In order to minimum wear also lubricates described rolling bearing again with uniform spacing, but this means that higher maintenance expends.In order to tackle above-mentioned danger when transporting, then in logistics, take corresponding safeguard measure, such as, use special and packaging that is that expend and pay attention to suitable transportation regulations.
So-called air bearing (see DE 10 2,008 049 050 A1 and Fig. 3 and 4) is also used as an alternative in modern computer computed tomography (SPECT) system.Wherein between rotating element and stator, form air gap, (being such as made up of the graphite) axial vane surface wherein by porous before rotor starts rotary motion radially imports compressed air.The minimum pressure fixed if realize in air bearing gap, then the element rotated is suspended on air cushion or air film, and this causes the friction between rotor and stator to minimize to heavens.Then rotor just starts to rotate.Because contactless rotation causes safeguarding freedom (need not change lubricant, wearing and tearing are minimum), generates less noise and produce less heat when rotor or drum rotation.
But because the very high compressibility of air must realize higher pressure between rotor and stator.Air gap between rotor and stator must keep obtaining very narrow (about 1/1000mm) for this reason.Typically less air gap can bear higher load.But this very narrow gap can cause described device to be unable to undergo temperature change, and this temperature change there will be all the time in computed tomography imaging system running.Due to the expansion of the material for this device, at rotor because temperature causes even there will be rotor card in the stator when expanding.In order to solve a this difficult problem, as shown in Figures 3 and 4 for stator have selected this special shape in DE 10 2,008 049 050 A1, gap is between rotor and stator greater than in the middle section of bearing-surface in inactive state in the perimeter of bearing-surface.Rotor outwards expands at a higher temperature, then just in time realize the gap roughly keeping same widths between the stator and the rotor.
But shortcoming is, keeps the perfect condition in the gap of same widths or the identical narrow gap of desirable entirety in this air bearing only within specified temperatures, realize under usual operating temperature.
In addition, air bearing also must supplied with compressed air constantly, for keep rotor not with stator contact.Expensive equipment must be provided for air input, for keeping air pressure and for controlling air supply arrangement for this reason.That is, expend for the less maintenance of bearing and bearing to a great extent without frictional property and without abrasiveness by exchanging for for peripheral cell with for expend of the feed unit of the bearing function that maintains air bearing more.
Summary of the invention
Therefore, technical problem to be solved by this invention is, there is provided a kind of for the rack bearing device of computed tomography imaging system and the method for the manufacture of this bearing like this, make to realize on the one hand bearing non-maintaining property high as far as possible and in the medium and small wearing and tearing of any operation phase, little as far as possible for expending of retainer shaft acknowledgement of consignment row but then.
Described technical problem is solved by a kind of frame with FDB on the one hand, it has the additional block bearing in stator, rotor, the lower zone that is arranged on epitrochanterian probe unit, FDB and is arranged on rotor and/or near the lower zone of rotor, described FDB there is gap between the stator and the rotor and described rotor with this gap relative stator supporting.Described technical problem on the other hand by a kind of for the method solution by rotor hydrodynamic pressure ground and/or the hydrostatically stator supporting of frame relatively.
According to the present invention, described frame have be arranged on rotor lower zone in and/or rotor lower zone on additional block bearing.
According to method of the present invention, in the lower zone that additional block bearing is arranged on rotor and/or on the lower zone of rotor.
Block bearing (change kind express) from system axis observe vertically on the center line parallel with system axis or near arrange between rotor and stator, or be arranged on along rotor axially in the region of approximate centerline.
Additional block bearing is used to cause, the wearing and tearing of hydrodynamic pressure and/or hydrostatic bearing when computed tomography imaging system starts because the contact in inactive state of rotor and stator minimizes, because block bearing supports like this and support rotor in inactive state, friction is between rotor and stator minimized.
Also have the frame comprising probe unit according to imaging modality of the present invention, it has described hydrodynamic pressure and/or hydrostatic bearing.
Probe unit (also referred to as scanning system) such as comprises illumination unit and the transducer for irradiating examine object or takes unit, and shooting unit projects independent x-ray image.Described cellular installation is on the element rotated, rotor or rotating cylinder, and the motionless element of their geo-stationary, stator rotate.Rotor relative stator is supported by described hydrodynamic pressure and/or hydrostatic bearing.
Also can be actionless as alternative sensor or shooting unit and extend around system axis circlewise, and only X source be fixed on rotor.Shooting unit extends in this case on the whole inner periphery of stator.If rotate in the process that rotor irradiates at the X source by jointly rotating with rotor, then the Shangdi, shooting face that projection is dispersed in the whole annular of actionless shooting unit is taken.
The present invention other particularly advantageous structural design and expansion design drawn by following explanation and accompanying drawing.
In the preferred structural design of one, being designed and sized to of block bearing, makes rotor be supported like this in inactive state, makes rotor not contact stator.Especially block bearing arranges size like this, make its rotor startup stage or the stage of stopping supporting rotor, thus rotor does not contact stator.
Therefore friction is between rotor and stator minimized.
Block bearing can be such as rolling bearing or especially ball bearing.To be rotatably supported on rotor or stator and various miscellaneous part has applicable bearing-surface at this roller and/or ball, roller or ball roll thereon, or roller and/or ball be not only bearing on rotor but also be bearing on stator and correspondingly two parts have the bearing-surface with roller and/or ball engagement effect.
Rotor and the stator contact area in inactive state is positioned at below rotor, around center line, that is, described center line by one by system axis and the vertical demifacet that forms and perpendicular to this demifacet orientation, intersecting straight lines between the tangent plane in contact rotor bearing face forms.Center line also can rotation vertical lower, be parallel to rotor rotation or be parallel to system axis extend.Therefore according to a kind of particularly preferred reasonable in design be, at least two block bearings vertically before and after ground, be arranged in vertically below rotor with the fixing spacing of the center line relatively extended vertically, for avoid the rotation of rotor startup stage or the stage of stopping tilt.Described fixing spacing should make block bearing as far as possible mutually remotely arrange, for ensureing stable rotor-position.Numerical value can not be provided, because it depends on the various different geometry of gantry configuration or very different scheme of machine design at this.
As alternative, at least two block bearings are arranged on right side and the left side of the center line extended below rotor, below rotor.They also will enough near act on epitrochanterian gravity make a concerted effort mounted, for keep due to the load of the bearing-surface of the block bearing formed perpendicular to force component or the pressure component (normal force or normal pressure) of bearing-surface orientation and wearing and tearing very little.If bearing decentre line is too far installed, then the normal force on bearing or corresponding normal pressure very high, therefore cause the wearing and tearing of bearing or bearing components to be increased.
FDB can be hydrodynamic pressure and/or hydrostatic bearing and can be designed to, make stators and rotators have mutually towards bearing-surface.Bearing-surface is optimized to, and makes them reduce the frictional force occurred when rotor rotates between rotor and stator.Fluid in gap between rotor and stator, location, between bearing-surface is used for, and rotor is separated by fluid when rotor rotates with stator.
The advantage of the bearing of hydrodynamic pressure is, can ensure the supporting of rotor relative system axis (rotation) precise alignment more simply.
The advantage of the bearing of hydrodynamic pressure is, the fluid of outflow can input in gap without pressure.This means, be different from hydrostatic bearing, the pressure needed for supporting rotor need not be consisted of independent device.And required pressure is consisted of the rotation of rotor and the lubrication wedge self that formed below rotor in rotation.Fluid can in the upper area of bearing input shaft bearing, in upper area, produce lower pressure.Input fluid in the lower pressure region of bearing.Also be provided with fluid control device at this, it can targetedly with certain pressure input media.When fluid space is filled all the time and is closed, described input fully pressure-free power ground effect.
Because be in operation, rotor and stator do not have Mechanical Contact, therefore can realize less operation noise.In addition the bearing arrangement of this form achieves the continuous service without wearing and tearing.The lower coefficient of friction of FDB also allows the less or lighter rotating driver of size.Otherwise, use heavier rotor when not changing stronger rotating driver or there is the rotor of larger diameter.
Due to the higher pressure produced that is in operation in hydrodynamic pressure bearing arrangement, then a part of fluid can flow out and again must be fed back to bearing without pressure from bearing.Therefore especially in the bearing of hydrodynamic pressure, described device preferably also has the feedback device for the fluid flowed out, and it is arranged like this, and the fluid flowed out from gap is fed back to gap without pressure by this device.
Described feedback device is arranged equally like this, fluid is such as input in the upper area of bearing, wherein produces lower pressure, such as, on above-mentioned input unit.Fluid is imported in the area of low pressure of bearing.Also can be provided with fluid control device, it is targetedly with certain pressure input media.When fluid space is filled all the time and is closed, described input fully pressure-free power ground effect.
Gap between rotor and stator preferably passes outwardly the sealing device sealing that the circumference along gap extends vertically.
This advantage had is, can realize higher pressure and therefore such as can support heavier rotor by sealing effectiveness in gap.Sealing device especially stops in inactive state and the more substantial fluid that is in operation flows out from gap or bearing.
Sealing device also for closing or protecting bearing by the pollution caused due to external particle, which avoid the wearing and tearing caused by these contamination particles.The closure of bearing also achieves availability higher in hostile environment condition.
Fluid can be such as lubricant or antiseize paste.It especially has the lubricant of oil, oily matrix or oil-containing.Fluid additionally can also comprise additive.
Oil or there is extraordinary damping performance and therefore achieve rotor specially quietly operate by the oil film of oil generation.The use of oil also improves the mechanical load performance of bearing, and this is particularly advantageous in having larger diameter and heavy weight bearing.
Other designs of fluid also can comprise emulsion or suspension-turbid liquid.This emulsion or suspension-turbid liquid can comprise again or also only can comprise the lubricant as the oil of component, the matrix of oily or oil-containing.
As alternative, fluid also can be gas or admixture of gas.
The feasible program of the layout of sealing device is, sealing device is arranged on stator.
The another kind of feasible program of the layout of sealing device is, sealing device is arranged on rotor.
According to the preferred technical scheme of one, sealing device had such as alternately both been arranged on stator and had also been arranged on rotor.
FDB is such as designed to outer bearing.This is referred to stator and be positioned at the inside of the device be made up of stators and rotators and rotor rotates around stator in outside.
As alternative, fluid bearing design is inner bearing.In this case stator in outside around rotor.This rotor also can at the inner circle be made up of the bearing of stator or stator or interior cylinder internal rotating.
In order to compensate tilting moment and expand bearing-surface, rotor is preferably designed for taper in two axial edge regions of rotor, and the inner surface of stator is same, suitable with conical by its shape vertically in two fringe regions of rotor with the shape adaptation ground of rotor.The larger bearing-surface caused by this special shape reduces the load of unit are, and acts on the pressure on lubricant and bearing-surface.This causes better result in reduction friction, wearing and tearing, maintenance expend and improves the maximum (top) speed of rotor.The rotating speed high as far as possible of rotor is expected very much, because can reduce the irradiation time of patient as previously mentioned like this and advantageously reduce the irradiation load of patient thus.
In order to reduce friction and wear further and compensate tilting moment better, rotor can be designed to vertically, makes gap zigzag extension vertically.Another advantage of this special tectonic is, can realize better sealing.This sealing such as can use labyrinth sealing effect, and wherein this design is optimised on external margin.The pressure of internal fluid can from hydrostatic state phase hydrodynamic pressure state-transition, and fluid velocity can also correspondingly change according to Bernoulli's theorem.This characteristic can improve sealing property in labyrinth-type excluder.
In order to start at computed tomographic apparatus and realize rotor support stable as far as possible when stopping and support meaningfully, sealing device is arranged between block bearing vertically, and therefore block bearing is positioned at the outside of seal cavity.Therefore, block bearing can be arranged in the axial edge region in gap very outerly, and stops and occur acting on epitrochanterian tilting moment in this stage or thisly act on epitrochanterian tilting moment and compensated by the very outer layout of block bearing.In addition, being positioned at outside block bearing can be safeguarded or is changed simply, because be easy to be positioned at outside block bearing close to these.
Can arrange sealing device like this as alternative, block bearing is positioned between sealing device vertically, and therefore block bearing is positioned at by the inside in the gap sealed.Current block bearing can by the lubricant lubrication be in gap.The block bearing being such as designed to ball bearing or rolling bearing no longer needs to lubricate in this structural design again.
The combination of these modification is also feasible, namely has block bearing between seal cavity and outside.
Great advantages in special circumstances is, bearing axially only extending in partial section along rotor.Bearing such as forms two bearer rings in this case, and they are spaced vertically.
Can be this situation in outer bearing, its rotor outside portion rotates around stator.Therefore the part of bearing is also vacated when the part vacating stator vertically, the X-ray being then arranged on epitrochanterian X-ray irradiation apparatus can directly by these notches or according to the check object covered by means of only plastic front board, and therefore (can not be disturbed because a part for the spectrum of light beam is absorbed by stator) this detection is directly carried out between bearer ring.Such as at least four sealing rings may be needed in this case.Two sealing rings may need the gap for being formed towards external seal two, and two sealing rings inwardly need, namely towards irradiation space sealing two gaps.Input unit or the feedback device of the fluid for flowing out from bearing should also should be set separately respectively in the section roller bearing portion section of two isolation.
In the special circumstances of this outer bearing, if inner bearing has very little diameter, then need vertically on rotor by Flange joint rotating cylinder (Drum), its diameter is different from the diameter of rotor.The diameter of rotating cylinder is greater than the diameter of bearing mostly, for being provided for the space of the abundance of examine patient in rotating cylinder.
Accompanying drawing explanation
Again set forth the present invention further referring to accompanying drawing in conjunction with the embodiments.Wherein be marked with identical Reference numeral for identical parts in different drawings.In the accompanying drawings:
Fig. 1 is the schematic diagram of computed tomography imaging system conventionally,
Fig. 2 is the schematic cross-sectional of the bearing of the rolling bearing had for frame conventionally.
Fig. 3 is the schematic cross-sectional of the air bearing of frame conventionally under the initial temperature in inactive state.
Fig. 4 is the schematic cross-sectional of the air bearing of frame conventionally at the temperature in running status.
Fig. 5 is the schematic cross-sectional with the frame of FDB be in stationary rotor state according to first embodiment of the invention,
Fig. 6 is in the operating schematic cross-sectional with the frame of FDB according to first embodiment of the invention when rotor rotates,
Fig. 7 is the signal longitudinal section of the frame of the FDB with Fig. 5 and 6,
Fig. 8 is the signal longitudinal section with the frame of FDB according to second embodiment of the invention,
Fig. 9 is the signal longitudinal section with the frame of FDB according to third embodiment of the invention,
Figure 10 is the signal longitudinal section with the frame of FDB according to fourth embodiment of the invention,
Figure 11 is the signal longitudinal section with the frame of FDB according to fifth embodiment of the invention,
Embodiment
Fig. 1 shows the common schematic diagram of computed tomography imaging system, in order to show its common structure.Described device comprises the frame 2 with static component 3 and the parts 4 around system axis 5 rotation.Rotating parts 4 has probe unit (X-ray system), and it is included in X source 6 mutually opposing on rotating parts 4 and X-ray detector 7.When computed tomography imaging system runs, X-ray sends from X source 6 towards the direction of X-ray detector 7, through detected object P, be such as patient P, and is detected with the form of measurement data or measuring-signal by X-ray detector 7.
Be also shown in the sick bed 9 for patient support P in FIG.Sick bed 9 comprises bearing 10, and this bearing 10 is provided with the patient's support plate 11 for actual patient support P.Patient's support plate 11 relative seat 10 can be adjusted to along the direction of system axis 5, and it is inputted in the opening 12 of the frame 2 of the 2D-X light projection for taking patient P together with patient P.The computing of the 2D-X light projection of being taken by probe unit or carry out based on the measurement data of 2D-X light projection or the tomograph of 3D data group of measuring-signal or the image calculator 13 of the reconstruction computer Laminographic device 1 of 3D rendering, wherein tomograph or 3D rendering illustrate on a display device 14.
In order to the rotating parts 4 being equipped with probe unit in addition can rotate relative to the static component 3 of frame, need the bearing arrangement of rotating parts 4.The bearing arrangement 15 of that schematically illustrate in Fig. 2, such as rolling bearing 15a, 15b, 15c, 15d form is set for this reason traditionally.This bearing is such as made up of four independent portion section 15a, 15b, 15c, 15d, the rotation of the low friction of their common guarantee rotating partss 4.
Fig. 3 illustrates the rotor-stator-device in inactive state when initial temperature T1, as it is described in document DE 10 2,008 049 050 A1.Air bearing 15 is designed at this computed tomography imaging system mid frame bearing arrangement.
The gap 17 that this device has stator 3, rotor 4 and forms between the stator and the rotor.Rotor is installed the X-ray system (not shown) with illumination unit and detecting unit.The compressed air with elevated pressures is imported in gap 17 between rotor 4 and stator 3.If reach sufficiently high pressure, then rotor 4 no longer directly contacts with stator 3, and therefore rotor 4 in fact can without frictionally rotating.In order to keep pressure in air bearing, input compressed-air must be continued when computed tomography imaging system runs in gap.That continue with glitch-free operation in order to ensure, the bearing for this special shape needs the feed unit (not shown) for input compressed-air.Because the temperature existing at device depends on running status, and the material for constructing frame 2 has the different coefficients of expansion, so when there is the gap of whole same widths under initial temperature T1 in inactive state, that is when the whole circumference radially around bearing-surface has constant space between rotor 4 and stator 3, in perimeter 19, there is the contact between the bearing-surface 16 of rotor 4 and stator 3,16a when temperature change, even there will be rotor seizure.And the gap 17 in central region 18 may be expanded as when temperature raises, air gap is made to lose support effects.
In order to tackle this problem, conventionally, stator 3 radius r (
) or the curature variation of stator bearing surface 16a be make the thickness in gap 17, gap namely between stator 3 and rotor 4 outside, namely to increase from the median plane 20 of device or the larger spacing of intermediate section 18 towards region 19.Which results in, in inactive state, when temperature T1, gap 17 is less in more outer region 19 at ratio in the region 18 of median plane 20.The special tectonic of pitch pat between the stator and the rotor allows rotor 4 outwards to expand when higher temperature, and it there will not be the stuck of the contact between the bearing-surface 16 of rotor 4 and stator 3,16a or even rotor 4.When operating temperature, the width of air gap 17 is roughly the same on the whole.Fig. 4 illustrates the air bearing 15 when temperature T2 in running status.The radius that rotor increases when higher temperature is called as RROT (T2).
The illustrated embodiment according to FDB of the present invention is schematically illustrated in Fig. 5 to 7.
Fig. 5 illustrates the schematic cross-sectional according to the frame 2 with FDB 15 in the remaining static of first embodiment of the invention.This frame has stator 3, rotor 4, the FDB 15 with gap 17 and fluid 21, and this fluid 21 is arranged in intermediate space 17 and is used as lubricant.Additionally, additionally observe two supportings or auxiliary bearing 22 are set the vertical lower zone of frame in the lower zone of frame 2, namely from system axis 5 according to this embodiment.Block bearing 22 is such as designed to rolling bearing, is especially designed to ball bearing.
Supporting or auxiliary bearing 22 supporting rotor 4 in inactive state, therefore the bearing-surface of rotor 4 does not contact the bearing-surface of stator 3 in the lower zone of bearing with frame 2 in inactive state yet.In addition, block bearing is frictionally supported except its supporting functions also ensures that rotor 4 is low when rotor startup.Avoid the running face of rotor 4 and stator 3 to wear and tear due to friction, such as sliding friction or mixed film friction thus when the rotation status transition from inactive state to rotor.Or rather, between the ball of ball bearing and bearing-surface 16,16a, only effect has rolling friction, and wherein rolling friction is cut down further by special lubricant or the fluid 21 that uses in gap 17.
By identical mode, block bearing 22 prevents the running face of rotor 4 to contact with the direct of running face of stator 3 in the transition from rotation status to inactive state, and self ensure that the supporting of the low friction of rotor 4 simultaneously, therefore also can avoid the sliding friction between the running face and the running face of rotor 4 of stator 3 in this case and can obviously reduce wear due to the friction in this transition stage.Offset (showing turgidly in Figure 5) in the system axis 5 downward (namely along gravity direction) of the central point of inactive state rotor 4 or center, the namely frame 2 of the relative bearing of longitudinal axis (rotation).
The offsetting of described rotor axis or bias can be determined and is stored for different rotating speeds, so that known axis is positioned at where all the time.If off-centring is not more than such as 0.1mm (radius), then need not take measures.Rotor 4 rests on block bearing 22 in such state.Block bearing 22 contacts with the running face of rotor 4.Block bearing 22 prevents the longitudinal axis of rotor to offset further downwards, and namely rotor is away from the vertically displacement further of system axis ground.
In transition state between inactive state and rotation status in the lower zone of bearing 15, between the running face and the running face of stator 3 of rotor 4, also there is no so many fluids or lubricant 21, making to were it not for block bearing 22 friction can disappear completely.If there is no block bearing, can rotor 4 startup stage there is mixed film friction.This can be interpreted as intuitively, although fluid 21 be filled in recess in the running face of rotor 4 and the running face of stator 3 completely and and then stop two running faces to be said visually in this unevenness microscopically mutually " blocking ", adhesion friction or concentrated sliding friction can also be stoped in such state.
But this running face still very likely contacts in this region, described region exceeds described recess and therefore can not be bedewed by the fluid 21 being arranged in recess.If two running faces of rotor 4 and stator 3 are not spatially separated from each other by block bearing 22 as shown in Figure 3, then still as before, considerable friction may be there is between rotor and two running faces of stator in such state, this may cause temperature to raise when rotor 4 high rotating speed, and wearing and tearing aggravation and noise increase.Additionally arrange feedback device 25 to flow out for fluid 21, wherein feedback device 25 is set to, and the fluid 21 flowed out from gap 17 by it can be fed back without pressure.
Fig. 6 illustrates according to the cross section being in the FDB 15 in rotation status for computed tomography imaging system embodiment illustrated in fig. 5.In rotation status, because the rotary motion of rotor produces very large pressure in the lower zone of bearing 15 between the running face of stator 3 and the running face of rotor 4.This forms so-called lubrication wedge.This lubrication wedge is reverse like this improves rotor 4 in vertical direction, and rotor 4 is no longer contacted with block bearing 22.When not having the intervention of block bearing 22, the running face of rotor 4 no longer contacts with the running face of stator 3.Therefore the friction between the running face and the running face of stator 3 of rotor 4 is cut down greatly.Which results in and also can avoid more violent friction even without the intervention of block bearing 22 in rotation status.
Rotation slightly downward and flatly special offsetting of reverse rotational direction (in this case flatly left) mildly when relative system axis rotates of rotor.Certain this effect is very little and also can reliably determine.Even if rotor is arranged mildly prejudicially, described in be rotated in constant rotating speed around relatively its position and the constant rotation of orientation carry out completely equably in such state.
When shutting down computer computed tomography (SPECT) system, the rotating speed of rotor 4 again reduces and therefore also can cause pressure drop, overcomes be raised for gravity by rotor 4 described in this pressure.Block bearing 22 again contacts with rotor 4 and also rotor 4 can be stoped to contact with stator 3 when the rotation brake of rotor.
Certainly in the rotary course of rotor 4, in lower zone below rotor 4, existing between the running face and the running face of stator 3 of rotor 4 pressure acted on fluid 21 is so high, makes fluid 21 partly walk around sealing device and extrudes from gap 17.Then, in this case must again to input fluid 21 in bearing or the gap between rotor 4 and stator 3 17.
Fig. 7 illustrates the signal longitudinal section of the frame (in the vertical plane comprising system axis 5) of the FDB with Fig. 5 and 6.Wherein only schematically illustrate for the important rack unit of the present invention, namely described cross section is in the central area of passageways of patients and outwards disconnect.Stator 3 is arranged in the perimeter of bearing 15 and surrounds rotor 4, and this rotor 4 rotates around system axis 5 at the center of bearing.Center layout rotor being placed in stator interior so is also called inner bearing.Block bearing 22 to be arranged on stator 3 and to protrude in the gap 17 between stator 3 and rotor 4, for rotor startup stage and to stop stage supporting rotor 4, therefore can avoid the heavy wear produced due to the attachment friction between the running face of stator 3 and the running face of rotor 4 or sliding friction or mixed film friction.Sealing device 23 is provided with in the fringe region observed vertically in gap, for seal clearance 17 outwardly, therefore the least possible fluid 21 or do not have fluid 21 to reserve from gap especially completely.
Fig. 8 illustrates (as Fig. 7) signal longitudinal section with the frame of FDB 15 according to alternative of the present invention.Although this form of implementation is also designed to inner bearing, but connect rotating cylinder 24 (English drum) at rotor 4 upper flange, this rotating cylinder 24 comprises illumination unit and detecting unit or probe unit (not shown), or installs illumination unit and detecting unit on this rotating cylinder 24.
Sealing device 23 is shown in addition, its outside sealed bearing.
In this form of implementation, bearing 15 (comprising stator 3 and rotor 4) is radially provided with less diameter.Rotating cylinder 24 can have the diameter be applicable to of the diameter being different from rotor 4.Especially the diameter of the larger cylinder 24 of the diameter of rotor 4 is advantageously compared, because be necessary for probe unit and patient provides sufficient space.
(as Fig. 7) signal longitudinal section of that Fig. 9 illustrates again the embodiment of alternatively recommending, that there is FDB 15 frame.In this case, FDB 15 is designed to outer bearing.This means, rotor 4 forms around stator 3 and rotates around stator 3.In this form of implementation additionally by rotating cylinder 24 Flange joint on rotor 4, wherein rotating cylinder 24 comprises illumination unit and detecting unit.In this form of implementation, bearing is equipped with sealing device 23, for avoiding or the outflow of limit fluid 21.
Certainly it is also conceivable to the form of implementation with outer bearing, wherein on rotor 4, directly illumination unit and detecting unit are installed.In this case, stator 3 vertically and circumference be all configured with notch, for guaranteeing the direct irradiation of the patient being in device inside, and can not be absorbed by hardware or like, such as, extend only through plastic veneer.
In this case, bearing 15 such as can be designed to two collar bearings separated by the notch extended vertically.
Figure 10 illustrates (as Fig. 7) signal longitudinal section with the frame of FDB 15 according to alternative of the present invention, and frame has stator 3 and the rotor 4 of special shape.In this embodiment, stator 3 and rotor 4 are designed to conical vertically, namely outside shrinking.The larger bearing-surface of this constitution realization and the tilting moment acted on rotor 4 better protected.The bearing-surface increased result in the reduction of effect pressure on the bearing surface and the wearing and tearing of the sliding capability of improvement and the less of bearing-surface.In addition, less when pressure is less fluid (next it must be replaced or feed back) also flows out from gap 17.Block bearing 22 is positioned at the opposite side of sealing device 23 vertically in this form of implementation, namely in the outside of the gap 17 sealed by sealing device 23 (it is made up of the bearing-surface 16 of the stator 3 of FDB 15 and rotor 4,16a).Therefore more easily touch them, to carry out the maintenance work of block bearing, such as, change, because be arranged on the outside in the gap closed by sealing device according to the block bearing of this form of implementation.
(as Fig. 7) signal longitudinal section of that Figure 11 illustrates alternatively embodiment equally, that there is FDB 15 frame.According to this form of implementation, stator 3 and rotor 4 are designed to zigzag vertically.The bearing-surface that this structure can realize expanding further can protect tilting moment again better.In this form of implementation, block bearing is observed vertically and is arranged between two sealing devices 23.Although this makes the dismounting of block bearing or changes more difficult because block bearing in gap all the time by fluid 21 around so it is lubricated constantly, this makes to lubricate again and expends because this reducing maintenance.
The block bearing 22 illustrated in the aforementioned embodiment both can use in the bearing of hydrodynamic pressure, also can use in hydrostatic bearing.In upper a kind of situation, block bearing is for preventing the collision when fault of rotor and stator, and such as feedway lost efficacy.In addition, described pressure can reduce at failure condition, and fluid is transfused in hydrostatic bearing with this pressure.In this case, block bearing is for avoiding contact between rotor and stator.
Finally point out again, the FDB before described in detail is only such embodiment, and it can be revised in every way by technical staff, only otherwise depart from the scope of the present invention.In addition, the possibility that involved feature also can repeatedly exist is not got rid of in use indefinite article " ".The concept of " unit " does not get rid of the possibility that involved parts are made up of the section components of multiple mating reaction equally, and they equally also can be spatial dispersion.
Claims (15)
1. the frame (2) of a medical imaging device (1), it has stator (3), rotor (4), the probe unit be arranged on described rotor (4), FDB (15), with within the lower zone of described rotor (4) and/or near the additional block bearing (22) of setting, described FDB (15) has gap (17) between stator (3) and rotor (4) and described rotor (4) supports with described gap (17) relatively described stator (3).
2. according to frame according to claim 1 (2), it is characterized in that, described FDB (15) is hydrostatic bearings and/or hydrodynamic pressure bearing, and described block bearing (22) is dimensioned to, described rotor (4) is under static state supported by the mode not contacting described stator (3).
3. according to the frame (2) described in claim 1 or 2, it is characterized in that, described block bearing (22) is dimensioned to, make described rotor (4) rotation startup stage or the stage of stopping in, described rotor (4) is supported by the mode not contacting described stator (3).
4. according to the frame (2) one of claims 1 to 3 Suo Shu, it is characterized in that, at least two block bearings (22) are arranged in described rotor (4) below vertically with the spacing fixing relative to the center line extended vertically (20).
5. according to the frame (2) one of Claims 1-4 Suo Shu, it is characterized in that, at least two block bearings (22) are arranged in rotor (4) below, in the right side of described center line (20) and left side.
6. according to the frame (2) one of claim 1 to 5 Suo Shu, it is characterized in that, described gap (17) passes outwardly sealing device (23) sealing that the circumference along gap (17) extends vertically, thus forms seal cavity (26).
7. according to frame according to claim 6 (2), it is characterized in that, described sealing device (23) is arranged on described stator (3) and/or on described rotor (4).
8. according to the frame (2) one of claim 1 to 7 Suo Shu, it is characterized in that, the axial edge zone design of described rotor is taper, and described stator (3) is designed to close with the matching form of described rotor (4).
9. according to the frame (2) one of claim 1 to 8 Suo Shu, it is characterized in that, described rotor (4) is designed to vertically, makes described gap (17) zigzag extension vertically.
10. according to the frame (2) one of claim 6 to 9 Suo Shu, it is characterized in that, described sealing device (23) is arranged between described block bearing (22) vertically, thus described block bearing (22) is positioned at described seal cavity (26) outside.
11. according to the frame (2) one of claim 6 to 10 Suo Shu, it is characterized in that, at least one block bearing (22) is arranged between described sealing device (23) vertically, thus described block bearing (22) is arranged on the inside of described seal cavity (17).
12., according to the frame (2) one of claim 1 to 11 Suo Shu, is characterized in that, described FDB (15) axially only extending in partial section along described rotor (4).
13. according to the frame (2) one of claim 1 to 12 Suo Shu, it is characterized in that, vertically on described rotor (4) by Flange joint rotating cylinder (24), the diameter of described rotating cylinder is different from the diameter of described rotor (4).
14. 1 kinds of medical imaging devices, it has according to the frame (2) one of claim 1 to 13 Suo Shu.
The method of stator (3) hydrodynamic pressure of 15. 1 kinds of frames for relative medical imaging device (1) (2) and/or hydrostatically supporting rotor (4), wherein, there is the rotor (4) of probe unit, stator (3) and FDB (15) are arranged to, make to form gap (17) between described stator (3) and described rotor (4), and described rotor (4) relative stator (3) is supported, and wherein within the lower zone of described rotor (4) and/or near be provided with additional block bearing (22).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102013224886.5 | 2013-12-04 | ||
| DE102013224886.5A DE102013224886B4 (en) | 2013-12-04 | 2013-12-04 | Storage of a rotor of a gantry of an imaging medical-technical device |
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| Publication Number | Publication Date |
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| CN104703373A true CN104703373A (en) | 2015-06-10 |
| CN104703373B CN104703373B (en) | 2017-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410737029.8A Active CN104703373B (en) | 2013-12-04 | 2014-12-04 | The supporting arrangement of the rotor of the frame of imaging modality |
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| Country | Link |
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| CN (1) | CN104703373B (en) |
| DE (1) | DE102013224886B4 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105508427A (en) * | 2016-02-20 | 2016-04-20 | 杭州佳巨机械配件有限公司 | Hybrid bearing combined with shallow cavity |
| CN111812734A (en) * | 2020-05-29 | 2020-10-23 | 清华大学 | CT scanning device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102016204006A1 (en) * | 2016-03-11 | 2017-09-14 | Siemens Healthcare Gmbh | Arrangement with a stationary part and a first rotating part of a gantry of a computed tomography device and method for servicing a component of a gantry of a computed tomography device |
| CN112045203B (en) * | 2020-08-25 | 2023-06-09 | 浙江斯特隆科技有限公司 | Mould moving arm with angle adjustment |
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| KR20020072078A (en) * | 2001-03-08 | 2002-09-14 | 한국전기연구원 | Direct operationtype gantry for computed tomography system |
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Also Published As
| Publication number | Publication date |
|---|---|
| DE102013224886A1 (en) | 2015-06-11 |
| CN104703373B (en) | 2017-07-07 |
| DE102013224886B4 (en) | 2021-07-29 |
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