CN105276082A - Suspended flexible flywheel - Google Patents

Abstract

The invention provides a vertical energy storage flywheel device which is suitable for fixed places of power grid peak adjustment, wind power generation, uninterrupted power source, etc. Pulling-bearing twisting-transmitting flexible transmission members of circular chain, universal drive shaft or wire rope, etc. are used for suspending the flywheel body below a rotating shaft. The flywheel is provided with one or more sets of serially connected wheels. Each set of wheels is provided with one or more mass blocks and one or more supporting members which are connected through a flexible film ring and a bearing end surface pair. The rotating shaft is provided with a set of axial supporting permanent magnetic bearings. Two ends of the rotating shaft can be provided with radial rolling bearings or radial magnetic suspension bearing. A rotating member is arranged in a vacuum container. The suspended structure of the wheel can settle problems of unbalance and resonance in a conventionally used simple supported rotor in which the wheels are combined with the rotating shaft. The plurality of sets of serially connected wheels facilitate manufacture and increase of energy storage volume density. A plurality of axial supporting permanent magnetic bearings in a line or a row settle a problem of supporting a large-mass flywheel.

Description

Suspension type flexible flywheel

Art

The present invention relates to a kind of accumulated energy flywheel device, particularly at the accumulated energy flywheel device of fixed-site application.

Background technique

Accumulated energy flywheel utilizes the kinetic energy storage mechanical energy of High Rotation Speed wheel body, can be used for the occasion needing energy storage and conversion, comprises the fixed-site application such as peak load regulation network, wind-power electricity generation, uninterruptable power source.

The flywheel wheel body that flywheel energy derives from larger quality rotates with very high linear velocity, and wheel body mass block all adopts unidirectional continuous fiber reinforced plastic Filament Wound Composite shaping, obtains maximum energy storage density to utilize the high-strength feature of fiber reinforced plastic.But, the more difficult control of dynamic unbalance force and moment of large quality, high linear speed composite material wheel body.First be that dynamic balance calibration difficulty is large, one is the dynamic balancing machine needing bearing load very large; Two is that the combination of wheel body and rotating shaft mostly is freely-supported flexible rotor, needs to correct the larger high-speed balancing of difficulty, and needs vacuum moving equilibrium conditions; Three is that larger displacement deformation can occur for fiber reinforced plastic under High Rotation Speed, and amount of deformation is with rotation speed change, and it is very unfavorable to correct high-speed balancing.The growth of dynamic unbalance when more disadvantageously working, one is that larger displacement deformation occurs, and the difference of size and material makes the uneven symmetry of this distortion occur; Two is that progressive creep strain behavior occurs Long-Time Service.Resiliently deformable and the creep compliance of glass fiber reinforced plastic are larger, cfrp less, but the material price cost of this kind of high elastic modulus of carbon fiber is too high, hinder economy of large scale application, and glass fibre is suitable for practical application, but to overcomes and solve its distortion and the large problem of creep compliance.

In brief, the rotation imbalance problem of existing accumulated energy flywheel is large, solves technique difficult, easily causes larger unbalance vibration, and aggravation is uneven with lengthening service time.And most of flywheel keeps away not open resonance speed within the scope of its running speed, bring the problem by point of resonance.Flywheel mass is larger, and it is uneven and resonance problem is larger.More with large quality at the accumulated energy flywheel of fixed-site application, such as peak load regulation network and wind-power electricity generation steady load accumulated energy flywheel used just has very large quality, and imbalance and the resonance problem of this kind of flywheel especially loom large.

Summary of the invention

Be mainly the above-mentioned imbalance and resonance problem that overcome existing accumulated energy flywheel, the accumulated energy flywheel that the present invention is directed to fixed-site application proposes suspension type flexible flywheel scheme, is described as follows.

The accumulated energy flywheel device that one is called " suspension type flexible flywheel ", can be applicable to the fixed-sites such as peak load regulation network, wind-power electricity generation, uninterruptable power source.Its fundamental composition comprises: the rotary wheel of one or more sets series connection, a rotating shaft (101), and the bearing in rotating shaft contains the housing of vacuum in wheel body, chamber.Its essential feature comprises: shaft centerline is perpendicular to ground (i.e. vertical flywheel), cod in rotating shaft adopts one group of axially mounting Permanent-magnet bearing, wheel body is positioned at the lower end of rotating shaft, wheel body is connected with central shaft (102), central shaft is connected by bearing torsion pass flexible drive parts with rotating shaft lower shaft end, and wheel body is suspended on below rotating shaft.

Bear torsion pass flexible drive parts and can adopt a set of universal drive shaft, comprise the transmission shaft at two universal joints, middle transmission shaft, two ends, upper end transmission shaft is connected with rotating shaft (101), and lower end transmission shaft is connected with central shaft (102).Lower end transmission shaft is not by the free axis of bearing support constraint, these are different from normally used universal drive shaft, intermediate propeller shaft and lower end transmission shaft all can not rotate around Pivot Point Center line, actual conditions be comprise wheel body and rotating shaft whole rotating components all around a center line---rotating shaft (101) shaft axis rotate.Each universal joint is by two joint entry parts (104,121) and a middle shaft member composition, form two revolute pairs, the shaft axis of two revolute pairs is all perpendicular to the center line (symmetrical center line of middle shaft member, vertical axis), and orthogonal, namely the rotating shaft of two revolute pairs is mutually perpendicular transverse axis.The rotating shaft of two revolute pairs can intersect vertically, and middle shaft member is normally used universal-joint cross trunnion (103); The rotating shaft of two revolute pairs also can vertically be staggered, and middle shaft member is the distortion of cross axle, and namely two transverse axis (119) have pulled open certain distance along plotted translation.In flexible suspension effect, the cross axle that is staggered is identical with crossing cross axle (103) role, but is staggered cross axle scheme in optimization gimbal structure, and mainly optimization joint entry part structure and intensity aspect have greater advantage.

Universal joint revolute pair can adopt the needle roller (105) of full dress, and needle roller contacts with the cylinder axial plane of crossing cross axle (103) or the transverse axis that is staggered (119), or contacts with the high hardness bearing inner race (106) set up.Fig. 1 represents a kind of crossing Hooke's joint scheme of band bearing inner race (106), and the centrifugal force of needle roller (105), bearing steel bowl (107), the top ball in center (108), snap ring (109), seal sleeve (110) and O-ring seal all acts on joint entry part (104).Fig. 2 represents a kind of and intersects Hooke's joint scheme, and the centrifugal force of needle roller (105), sphere inner ring (113), spherical outer ring (112), nut (111), rubber ring (114) and inside and outside supporting ring thereof all acts on joint entry part (104).For reducing the stress of joint entry part, revolute pair part centrifugal force can be adopted by the scheme intersecting cross axle (103) or the transverse axis that is staggered (119) and bear, as the scheme of the employing tapered roller bearing (117) that Fig. 3 represents, aluminium bowl lid (116), aluminium cover (115) and seal ring, tapered roller bearing (117), the tiltedly centrifugal force of nut (118) all act in rotating shaft; Combination employing radial bearing needle roller (105) represented as Fig. 4 and the scheme of thrust-bearing needle roller (126), completely fill needle roller (105), bearing housing (122) and seal ring, needle roller (126) and retainer, the blowout patche (125) of thrust-bearing, the tiltedly centrifugal force of nut (124) all act in rotating shaft, only have the centrifugal action of the flat rubber ring (123) of axial limiting and seal action saving on entry part.

Under the condition not occurring larger static stress and distortion, the joint entry part of universal joint can adopt common cantilever structure.For significantly reducing static stress and distortion, the whole coil structures of non-cantilever can be adopted, only outputing two or four hole and forming revolute pair.For crossing Hooke's joint, the scheme that two joint entry parts can adopt the whole circle joint fork ring of size two diameters to be set with mutually, major diameter joint fork ring outside only can have two holes and assemble long transverse axis revolute pair, four holes are had at interior minor diameter joint fork ring, wherein two hole assembling short horizontal revolute pairs, other two apertures space is through long transverse axis; Meanwhile, whole circle joint fork ring is separation structure in axis, pitches ring and assemblies, be beneficial to the installation of cross axle by half merogenesis of two whole circles along two revolute pair center line subdivisions.The cross axle structure that is staggered provides very advantage for optimizing joint entry part, because two transverse axis are staggeredly arranged, pin axle type as shown in Figure 4 can be adopted to be staggered cross axle, two transverse axis (119) are as pin, in the pin-and-hole of vertical insertion vertical pivot (120), thus can adopt whole circle joint fork ring (121) without the need to half point, two joints fork ring (121) are separated from each other not overlapping, and each joint fork ring only has two holes to form revolute pair.

Bear torsion pass flexible drive parts and can adopt annular chains (Fig. 8, Fig. 9), upper and lower end respectively adopts half annulus (Fig. 5), the one or more annulus of middle employing, each annulus is made up of (Fig. 6) upper and lower two semi-rings and middle two straight sections lengthened, or between two straight sections, also have the lateral connection beam (Fig. 7) strengthened." hole axle " mixing ratio that two rings interlock is comparatively tight, the radius (legend is 201mm) in hole only slightly larger than the radius (legend is 200mm) of axle, to reduce bearing stress.Each latch closure has two rotational freedoms, subsistence level two latch closures (Fig. 8).More latch closure and chain length are advantageously in the unbalanced force reducing to be applied in rotating shaft (101).Annular chains (Fig. 8, Fig. 9) adopts welding method to form latch closure, or adopts casting method to form latch closure.Spheroidal graphite cast iron can be adopted to cast annular chains (Fig. 8, Fig. 9).Semicircular ring end shown in Fig. 5, Fig. 8, Fig. 9 be only a kind of special case with rotating shaft and central shaft attachment portion structure, Figure 16 give also the another kind of special case of semicircular ring end.

When flywheel weight and moment of torsion less time, bear torsion pass flexible drive parts and can adopt single or many wire rope.Single wire rope can alone (whole gravity be born in single cross section) or multiplex (whole gravity is shared in multiple cross section), wire rope is spirally wound between rotating shaft (101) lower shaft end and the upper axle head of central shaft (102) by the latter, multistage uniform distribution load, it is larger that moment of torsion transmits the arm of force.Many wire rope also can alone (the whole gravity of single cross section shared of many wire rope) or multiplex (multiple sectional uniform distribution load of every root wire rope), and the latter is multi-head spiral structure.When adopting multiplex scheme, the centrifugal forces affect of wire rope should be considered, at intermediate point one place of rope length or many places, intermediate portion, stopping-off piece (ring) is set evenly and at intervals, to bear wire rope centrifugal loading if desired.

Rotating shaft lower shaft end and the connection bearing torsion pass flexible drive parts, spline as shown in figure 14 can be adopted, screw thread and flange connection structure, that is: the internal spline of link (127) coordinates with the external splines of rotating shaft (101) lower shaft end and connects, transmitting torque, the outward flange dish of link (127) is matched with upper end outward flange dish (129) bearing torsion pass flexible drive parts by seam, and be fastened by bolts, nut (128) is fastened on shaft end, bear the gravity transmitted by link (127), the groove structure of nut (128) is beneficial to screw thread uniform load, also screw thread as shown in figure 15 and flange connection structure can be adopted, that is: the outward flange dish of link (130) is matched with upper end outward flange dish (129) bearing torsion pass flexible drive parts by seam, and be fastened by bolts, the internal thread of link (130) connects with the outside thread of rotating shaft (101) lower shaft end, this screw thread is except carrying gravity, and the self-locking frictional force also by screw thread transmits two-way moment of torsion, also direct thread joined structure as shown in figure 16 can be adopted, that is: the upper end formation (129) bearing torsion pass flexible drive parts is processed with internal thread, directly connect with the outside thread of rotating shaft (101) lower shaft end, this screw thread is except carrying gravity, and the self-locking frictional force also by screw thread transmits two-way moment of torsion, also can adopt following structure: process internal spline in the upper end part bearing torsion pass flexible drive parts, coordinate with the external splines of rotating shaft lower shaft end connect, transmitting torque, and have fastening nuts at shaft end, bear gravity, also can adopt pin shaft structure: the upper end part bearing torsion pass flexible drive parts forms axial cylindrical face, hole with rotating shaft lower shaft end and coordinates, and have a straight pin insertion to cross in the pin-and-hole of the two, carrying gravity and moment of torsion.

When on central shaft, axle head has solid shaft structural type, or there is hollow shaft structure but the outer diameter of axle is little time, above-mentioned rotating shaft lower shaft end and the linkage structure form bearing torsion pass flexible drive parts can be adopted, be connected with the end portion bearing torsion pass flexible drive parts, just upper-lower position and towards the opposite.When flywheel energy storage is larger, central shaft should adopt the drum forms (Figure 18) that external diameter is larger, the connection of its end and other part should adopt flange arrangement, and as shown in figure 17, the outward flange dish (132) of axle upper end is connected by seam and bolt with lower end outward flange dish (131) bearing torsion pass flexible drive parts.

When adopting the wheel body of many cover series connection, central shaft adopts the structural type of multistage combination, often overlaps the corresponding one section of central shaft of wheel body, by Flange joint between each section of central shaft, as shown in figure 18; But also can adopt the structural type of a shared long central shaft, each cover wheel body is coordinated by cylindrical interference or conical surface interference fit or taper middle cover structure and central shaft are fastenedly connected.

Flywheel wheel body is many bodies axially symmetric structure, a set of wheel body contains one or more quality bulk (53) and at least one supporting mass (54), the quality bulk being called structure in a set of wheel body and supporting mass are disposed in order successively with the little loop type of big ring sleeve, quality bulk is positioned at outmost turns and time outer ring of rotation, supporting mass is positioned at the inner ring of quality bulk, the fiber-reinforced polymer that quality bulk is wound around by circumference is formed, adopt axisymmetric flexible zona (55, 58) adjacent inner ring and outer ring structure body is connected, a ventricumbent end face of outer ring structure body is placed on a supine end face of inner ring structure body, two end faces composition load-bearing end face pair (56).

For the fiber-reinforced polymer that quality bulk is Wrapping formed, its fiber is unidirectional continuous fiber, the optional carbon fiber of kinds of fibers, aramid fibre, glass fibre etc., the optional high-strength glass fibre of glass fibre and E glass fibre etc., adopt Wrapping formed roving; Its polymer optional heat thermosetting resin and thermoplastic resin, the optional epoxy resin of thermosetting resin, unsaturated polyester resin, phenolic resin, bimaleimide resin, polyimide resin, cyanate ester resin etc.Carbon fiber reinforced polymer is compared with glass fiber reinforced polymer, and its advantage is: circumference (hoop) tensile modulus of elasticity is higher, and during rotation, distortion is less; The density of composite material is less, and specific strength is higher, and the energy storage density of unit weight is higher; Its shortcoming is: carbon fiber is expensive, and product cost is very high; Because density is less, and the advantage of intensity and not obvious or only maintain an equal level (relative high-strength fiber glass), the energy storage density of its per unit volume is lower.Therefore, adopt glass fiber reinforced polymer to have more comprehensive advantage, suitable economy of large scale application, all the more so after distortion and the large Resolving probiems of creep compliance.

Circumference (longitudinal direction of the material self) intensity of unidirectional fibre reinforced polymeric material structure is the highest, but radial and axial (transverse direction of material self) intensity of material structure is very low, makes wheel body mass block can only make the thinner cylinder ring of radial thickness.The quality bulk often overlapping wheel body can be single, two, three etc., weigh choice from respective pluses and minuses and select.Select the advantage of single quality bulk to be take full advantage of high linear speed region, higher unit weight energy storage density can be obtained, but its endoporus takes up space and can not effectively utilize, cause the energy storage density of the per unit volume calculated with whole equipment volume on the low side.Select the advantage of two quality bulk to be suitably make use of the useful space, and the quality bulk being positioned at inner ring can adopt intensity lower but the fiber that price is more honest and cleaner and resin, its shortcoming is that unit weight energy storage density is less than single quality bulk scheme.

The supporting mass Main Function of wheel body is connected between quality bulk with central shaft, and supporting mass number depends on connection radial dimension ratio and supporting mass material kind.The fiber-reinforced polymer that the optional circumference of supporting mass material is wound around, also selective metal material, the former must adopt in the inefficient higher line velocity location of Strength of Metallic Materials.The same reason very low because of radial strength, fiber-reinforced polymer supporting mass also often has the situation of many bodies.Because linear velocity is lower than quality bulk, supporting mass fiber-reinforced polymer can select intensity lower but the fiber that price is more honest and cleaner and resin.The supporting mass of innermost circle should select metallic material, is beneficial to the connection with rotating shaft.The optional steel of supporting mass metallic material, aluminum alloy, titanium alloy etc., aluminum alloy and titanium alloy have higher specific strength, and the external diameter of made supporting mass is comparatively large, can reduce the quantity of fiber-reinforced polymer supporting mass; Aluminum alloy also has that price is lower, the feature of lighter in weight.

Because Wrapping formed fiber-reinforced polymer is easily pulverized as flocculence fragment when High Rotation Speed failure damage, there is good Security, therefore, the more outer circle in position, wheel body that energy storage is larger adopts fiber-reinforced polymer to have security advantages clearly.

End face pair between Wheel structure body only can adopt a load-bearing end face pair (56), and namely a ventricumbent end face of outer ring structure body is placed on a supine end face of inner ring structure body; Also a load-bearing end face pair (56) and an end face pair (57 limited to top offset can be adopted, 64), two end face pairs can be designed as central combination together, form boss and recessinterengaging means, and the axial position of these two end face pairs is good with the center of gravity near load.Two opposing end surfaces of end face pair (56,57,64) leave allowance in radial height, the radial displacement dislocation produced during to compensate rotation, make end face pair to maximum (top) speed, remain effective active area static.Very close to each other between two opposing end surfaces of end face pair (57), combine axially locating effect with load-bearing end face pair (56), forced limit angles to misalign change, closely participate in the transmission of force and moment; Have gap between two opposing end surfaces of end face pair (64), play the position-limiting action of restriction outer ring structure body to top offset, limit angles misaligns change to a certain extent, sometimes or partly participates in the transmission of force and moment.For increasing the wear resistance of the secondary surface of contact of end face; increase effective area of contact; protection fiber reinforced plastic surface; and the object such as reliability and durability and absorbing; two opposing end surface materials of end face pair (56,57,64) can adopt rubber elastic material; as adopted urethane rubber, rubber end face thin plate (65) or rubber end face chunk (66) are glued together with matrix.Rubber end face chunk (66) has larger elasticity and distortion suitability, but its centrifugal load is comparatively large, should be arranged on the matrix of outer ring, adopts matrix inner hole surface carrying centrifugal load.Because the load of load-bearing end face pair (56) is larger, matrix appended by selection and Wheel structure main body are structure as a whole, guaranteed load bang path has sufficient margin of safety, and non-bearing end face pair (57,64) one end matrix adopts accessory structure, this accessory can be connected and fixed with adhesive and main matrix, and fitment material adopts the material same with main matrix phase.

Connect the flexible zona (55,58) of adjacent inner coil and outer ring structure body, can adopt single group or two groups, two groups of designs are better with the axial span of two groups.Often organize flexible zona to be made up of monolithic or more sheets of flexible zona, quantity depends on the consideration of the factors such as strength and stiffness.The flexible zona of every sheet all with inner ring and outer ring matrix gluing, existing directly gluing with main matrix, also have with accessory structure gluing, accessory structure is gluing with main matrix again, the material that fitment material adopts and main matrix phase is same.Installment state can be adopted not prebend the flexible zona (55) of distortion, and be made up of two ends root and middle body portion, the root of band cup head is gluing with matrix, and body portion thickness radially convergent designs, to reduce maximum stress.Also installment state can be adopted to have prebend the flexible zona (58) of distortion, zona part free state is in a pre-installation equal thickness flat washer shape, during installation, imposed deformation is to a side curved shape, distance center axle zona degree of crook is remotely comparatively large, substantially stretching to zona during maximum (top) speed in rotation.Flexible zona (55,58) material is elastic material, comprises rubber material, as urethane rubber.Flexible zona (58) also can adopt the composite material of elastic material and radial reinforcing fiber, and the fiber arranged along radial direction concentrates on center membrane face, significantly improves zona radial strength, does not affect the bending of film simultaneously, does not also reduce the elasticity of circumference.Carry out circumferential tension when flexible zona (58) is installed, increase zona internal orifice dimension to fit dimension, keep zona external diameter constant.For the flexible zona of the two group (58) between mass block, optional setoff installation (the Figure 11 of the flexible zona of certain axial distance is had with location end face pair, enlarged view IV), Offset compensates the axial shrinkage difference of outer ring relative inner ring when rotating, and is in radial straight configuration in the hope of the zona when maximum (top) speed.For the flexible zona of the two group (55) between mass block, there is the optional inclined design of flexible zona of certain axial distance with location end face pair, be in radial straight configuration in the hope of the zona when maximum (top) speed.

Connection between the supporting mass (54) of central shaft (102) and innermost circle, can adopt cylindrical interference to coordinate, or conical surface interference fit, or taper middle cover linkage structure; Also can adopt the linkage structure of flexible zona (55,58) and end face pair (56,57 or 64), be suitable for multistage combination center axle situation (Figure 18); Also between central shaft and the supporting mass (54) of innermost circle, supporting disk (62) can be installed, the central bore of supporting disk is connected with central shaft interference, the dish body of supporting disk is positioned at below the supporting mass of innermost circle, elastic material ring (63) is installed therebetween, the latter to be gluingly connected with the two, elastic material ring play simultaneously flexibly connect, load-bearing and axially locating effect, its material can use rubber material, as urethane rubber.

The axially mounting bearing of rotating shaft (101) adopts one group of axially mounting Permanent-magnet bearing, is made up of the axially mounting Permanent-magnet bearing of one or more series connection, for the situation that wheel body weight is larger, is suitable for adopting multiple bearing to connect.Axially mounting Permanent-magnet bearing adopts permanent magnet expulsive force formula or permanent magnetic attraction formula.

A permanent magnet expulsive force formula axially mounting Permanent-magnet bearing has a rolling disc and a stationary disk, rolling disc is positioned at the top of stationary disk, an air gap is had between the sides adjacent end face of two dishes, rolling disc is axisymmetric magnet structure, or the mixed construction of axisymmetric soft magnetic bodies and axisymmetric permanent magnet, or axisymmetric non-magnetizer, the mixed construction of axisymmetric soft magnetic bodies and axisymmetric permanent magnet three, stationary disk is axisymmetric magnet structure, or the mixed construction of axisymmetric soft magnetic bodies and axisymmetric permanent magnet, or axisymmetric non-magnetizer, the mixed construction of axisymmetric soft magnetic bodies and axisymmetric permanent magnet three, the magnetic circuit that magnetizes of above-mentioned all permanent magnets is also axially symmetric structure, the magnetic pole that on two dish sides adjacent end faces, same radius place is relative is contrary, magnetic repulsion upwards acts on rolling disc, design the gravity being used for offsetting rotor.

A permanent magnetic attraction formula axially mounting Permanent-magnet bearing has a rolling disc (59) and a stationary disk (60), rolling disc is positioned at the below of stationary disk, an air gap is had between the sides adjacent end face of two dishes, rolling disc is axisymmetric soft magnetic bodies structure, stationary disk is axisymmetric magnet structure, or the mixed construction of axisymmetric soft magnetic bodies and axisymmetric permanent magnet, or axisymmetric non-magnetizer, the mixed construction of axisymmetric soft magnetic bodies and axisymmetric permanent magnet three, the magnetic circuit that magnetizes of above-mentioned all permanent magnets is also axially symmetric structure, magnetic attraction upwards acts on rolling disc, design the gravity being used for offsetting rotor.

Above-mentioned axially mounting Permanent-magnet bearing does not have magnetic hysteresis and eddy current loss.Permanent magnetic attraction formula compares with permanent magnet expulsive force formula, has two large advantages: one is that rolling disc does not need to install permanent magnet, and the intensity of permanent magnet is very low; Two is that the Magnetic flux density of magnetic end face can organization design comparatively large, obtains larger bearing suction with less bearing outside diameter size.

The radial support bearing of rotating shaft (101) adopts two groups of rolling bearings, or two groups of radial support magnetic suspension bearings.

The axially mounting Permanent-magnet bearing of rotating shaft (101) is positioned in the middle part of rotating shaft, and radial support bearing is positioned at rotating shaft two ends (Figure 19, Figure 20, Figure 21, Figure 22).

Two groups of rolling bearings of radial support, one group of rolling bearing bears radial load, is positioned at rotating shaft lower end, and another group rolling bearing can bear radial load and bi-directional axial load, and is axially locating end, is positioned at rotating shaft upper end.Often organize rolling bearing to be made up of a rolling bearing or multiple rolling bearing, to meet the requirement of load and direction.Rolling bearing chamber is communicated with air.

For making flywheel rotating shaft (101) centerline in plumb position, structure as shown in figure 22 can be adopted, the levelness that adjustment support plate (133) is installed with basis (134), makes the levelness of flywheel rotating shaft datum clamp face (135) reach requirement; Also structure as shown in figure 21 can be adopted, bearing is made up of support plate (133) and sphere cone (137), the two surface of contact (136) is positioned at the sphere on shaft centerline for the centre of sphere, by the orientation angles of adjustment sphere cone during installation, be up to the standard requirement or flywheel shaft centerline of flywheel rotating shaft datum clamp face (135) is made to reach vertical state.

Rotating shaft lower end rolling bearing is to the force transferring structure of static element and support base, structure as shown in figure 20 can be adopted, bearing support (140) directly contacts with the interior cylindrical hole of the outer steel sleeve (139) containing axially mounting Permanent-magnet bearing stationary disk (60) and is connected, for ensureing the coaxality of upper and lower end bearing saddle bore, Combined machining upper and lower end bore is carried out to the correlated parts comprising outer steel sleeve, also the structure to the power transmission of vacuum chamber housing as shown in figure 19 can be adopted, bearing support (140) contacts with the interior cylindrical hole of ectosphere surface cover (141), the latter contacts with the inner ball surface of supporting disk (142), the centre of sphere of sphere is positioned on shaft centerline, spherical pair is used for the angle of adjustable axle bearing hole, the supporting ring (143) of outer ring is welded on the internal face of vacuum chamber housing (138), supporting disk (142) has larger center distance regulation nargin with the connection of supporting ring (143), after the suspension completing flywheel rotating shaft and wheel body is installed, the bolt of going between fastening supporting disk and supporting ring end face again, and Cock screw (144), packing ring (145) is wherein for adjusting height, the installation of adjustment packing ring and threaded fastener is by the human users entered from the manhole door on vacuum chamber housing.With external cylindrical surface bearing support (140) (Figure 19, Figure 20) and the Action of Gravity Field of inner incidental static element thereof on the cycle surface of bottom end bearing, to ensure the minimum load maintaining bearing, the external cylindrical surface of bearing support plays the effect allowing the axial free displacement of non-locating bearing face simultaneously.

The present invention program can realize following beneficial effect:

(1) vertical wheel body flexible suspension formula structure fundamentally avoids imbalance and the resonance problem that freely-supported rotor is combined in the conventional wheel body that uses and rotating shaft, wheel body is in autobalance rotation status, very little to the influence of unbalance power of upper end rotating shaft, also there is not point of resonance.

(2) the axially mounting Permanent-magnet bearing on vertical shaft solves the maximum supporting difficult problem of large mass flywheel---gravity support problem, and without frictional loss, without eddy current and hysteresis loss, no current and other energy resource supplies.

(3) multiple wheel body mass block (53) scheme, improves practical energy storage volume density.

Accompanying drawing explanation

Fig. 1: intersect Hooke's joint figure ().

Fig. 2: intersect Hooke's joint figure (two).

Fig. 3: a kind of universal joint revolute pair figure.

Fig. 4: be staggered Hooke's joint figure.

Fig. 5: annular chains end semicircular ring figure.

Fig. 6: the doughnut of annular chains.

Fig. 7: the doughnut of the band crossbeam of annular chains.

Fig. 8: the annular chains figure of annulus in the middle of being with.

Fig. 9: the annular chains figure of annulus in the middle of being with three.

Figure 10: a set of flexible flywheel wheel body meridian plane figure ().

Figure 11: a set of flexible flywheel wheel body meridian plane figure (two).

Figure 12: a set of flexible flywheel wheel body meridian plane figure (three).

Figure 13: a set of flexible flywheel wheel body meridian plane figure (four).

Figure 14: rotating shaft with bear the spline of torsion pass flexible drive parts, screw thread and flange connection structure.

Figure 15: rotating shaft and the screw thread and the flange connection structure that bear torsion pass flexible drive parts.

Figure 16: rotating shaft and the direct thread joined structure (semicircular ring of annular chains shown in figure) bearing torsion pass flexible drive parts.

Figure 17: central shaft and the outward flange connecting structure bearing torsion pass flexible drive parts.

Figure 18: the connection between many cover series connection wheel bodys, multistage central cylindrical axle.

Figure 19: axial permanent magnetic bearing and lower end radial bearing ().

Figure 20: axial permanent magnetic bearing and lower end radial bearing (two).

Figure 21: suspension type flexible flywheel upper end formation ().

Figure 22: suspension type flexible flywheel upper end formation (two).

Figure 23: suspension type flexible flywheel.

Figure 24: the stationary disk of suction type axially mounting Permanent-magnet bearing.

Embodiment

Suspension type flexible flywheel device specific embodiments (Figure 23) for peak load regulation network is as follows.

Major parameter: rated speed 1321.9r/min, nominal transmission power 12.8MW, maximum transmitted torque 277398Nm is (under 1/3 rated speed and above rotating speed, rated power 12.8MW can be transmitted), flywheel maximum outside diameter 9648mm, device maximum outside diameter 10697mm, device total height 15894mm, device gross weight 1414587kg, rotor gross weight 1181437kg, specified energy storage 38465kWh.

Flywheel rotor has the wheel body of the upper and lower tandem of 15 cover, often overlap wheel body and there are two quality bulk (53) and two supporting masses (54) (Figure 18), often overlap wheel body to be connected with a cylindrical section shape central shaft (102), neighbouring central shaft adopts flange to be connected with threaded fastener, the 14 sections of central shafts being positioned at below have identical structure, and one section of central shaft of the top has the flange plate (Figure 18) be connected with annular chains lower end flange plate (131).When assembling is installed, first lay a set of wheel body bottom and central axis component from bottom supporting, more from the bottom to top by cover remaining wheel body of assembly connection and central axis component.The fastening piece connecting 14 sections of same structure central shafts adopts stud and nut, and stud passes temporarily non-through hole space when assembling in place.

Wrapping formed high-strength woven glass roving fabric reinforced epoxy is adopted in the quality bulk material of outer ring, Wrapping formed E type woven glass roving fabric reinforced epoxy is adopted in the quality bulk material of inner ring, supporting mass material adopts Wrapping formed E type woven glass roving fabric to strengthen unsaturated polyester resin, and central cylindrical axle adopts spheroidal graphite cast iron.

Between outer ring and inner ring quality bulk, adopt a load-bearing end face pair (56).Between inner ring quality bulk and outer ring supporting mass, between outer ring and inner ring supporting mass, between inner ring supporting mass and central cylindrical axle, all adopt a load-bearing end face pair (56) and an end face pair (64) limited to top offset, two end face pairs concentrate design.Two opposing end surfaces of load-bearing end face pair (56) leave allowance in radial height, the radial displacement dislocation produced during to compensate rotation, make end face pair to maximum (top) speed, remain effective active area static.For increasing the wear resistance of the secondary surface of contact of end face; increase effective area of contact; protection fiber reinforced plastic surface; and the object such as reliability and durability and absorbing; two opposing end surface materials of end face pair (56) adopt urethane rubber materials, the end face thin plate (65) of this material and end face chunk (66) and matrix glued together.End face chunk (66) has larger elasticity and distortion suitability, but its centrifugal load is comparatively large, is arranged on the matrix of outer ring, adopts matrix inner hole surface carrying centrifugal load.Because the load of load-bearing end face pair (56) is larger, matrix appended by selection and Wheel structure main body are structure as a whole, guaranteed load bang path has sufficient margin of safety, and one end matrix of non-bearing end face pair (64) adopts accessory structure, this accessory sticks with glue agent and main matrix is connected and fixed, and fitment material adopts the material same with main matrix phase.

Between outer ring and inner ring quality bulk, between inner ring quality bulk and outer ring supporting mass, between outer ring and inner ring supporting mass, between inner ring supporting mass and central cylindrical axle, the flexible zona (58) of a monolithic is all set.Each flexible zona and accessory structure gluing, accessory structure is gluing with main matrix again, fitment material adopt with main matrix phase with material.Flexible zona adopts urethane rubber materials, zona part free state is in a pre-installation equal thickness flat washer shape, during installation, imposed deformation is to a side curved shape, and distance center axle zona degree of crook is remotely comparatively large, substantially stretching to zona during maximum (top) speed in rotation.Flexible zona carries out circumferential tension when mounted, increases zona internal orifice dimension to fit dimension.

The torsion pass flexible drive parts that bears between flywheel rotating shaft (101) and wheel body central shaft (102) adopts annular chains (Fig. 8), upper and lower end respectively adopts half annulus (Fig. 5) with flange plate, a middle employing annulus with lateral connection beam (Fig. 7)." hole axle " mixing ratio that two rings interlock is comparatively tight, and the radius in hole is 201mm, only slightly larger than the radius 200mm of axle, to reduce bearing stress.Adopt spheroidal graphite cast iron casting processing, first cast and process two end semicircular ring (Fig. 5), then annulus and following process process in the middle of casting under the condition of two end semicircular ring participation.

The connection of central shaft upper end and annular chains lower end, adopts flange arrangement (Figure 17, Figure 18).

The connection of rotating shaft lower shaft end and annular chains upper end, adopt spline, screw thread and flange connection structure as shown in figure 14, the internal spline of link (127) coordinate with the external splines of rotating shaft (101) lower shaft end connect, transmitting torque, the outward flange dish of link (127) is matched with annular chains upper end outward flange dish (129) by seam, and be fastened by bolts, nut (128) is fastened on shaft end, bear the gravity transmitted by link (127), the groove structure of nut (128) is beneficial to screw thread uniform load.

Axially mounting Permanent-magnet bearing is made up of the suction type axially mounting Permanent-magnet bearing of 12 tandems, each bearing has a rolling disc (59) and a stationary disk (60) (Figure 20, Figure 22), rolling disc is positioned at the below of stationary disk, has an air gap between the sides adjacent end face of two dishes.Rolling disc adopts the soft magnetic material 45# steel conical disc of 12 same size structures, each rolling disc passes through an adapter sleeve (147) (with outer conical surface, inner cylindrical surface, longitudinally have a seam) and a nut (146) and rotating shaft (101) fastening, middle spacer sleeve (148) is set between two adjacent rotated dishes, arrange spacer (152) between convex shoulder on rolling disc topmost and main shaft, these spacers play axially locating and guarantee the effect of reliable delivery axial force.Stationary disk (Figure 24) is made up of axisymmetric non-magnet material alloy matrix aluminum (151), soft magnetic material electromagnetic pure iron ring (149), permanent-magnet material neodymium iron boron ring (150), gluing connection between three, neodymium iron boron ring (150) radially magnetizes, adjacent neodymium iron boron ring magnetizing direction is contrary, main flux loop is by neodymium iron boron ring, adjacent two electromagnetic pure iron rings and relative rolling disc thereof, stronger air-gap field is produced between electromagnetic pure iron ring and rolling disc, to rolling disc formation magnetic attraction upwards, design the gravity being used for offsetting rotor.Linkage structure and the installation step of stationary disk (60) and other parts are as follows: rotating shaft upper end bearing pack and near after part and steel bearings seat (153) assembled, stationary disk topmost and upper end steel bushing (154) are first installed, then rolling disc (59) is topmost installed, spacer (152), adapter sleeve (147) and nut (146) and locking accessory thereof, again by first static element, the order of rear rotating component, stationary disk in the middle of installing by cover, rubber elasticity cushion cover (155) and middle steel bushing (156), and the rolling disc of centre, middle spacer sleeve (148), adapter sleeve (147) and nut (146) and locking accessory thereof, stationary disk bottom is finally installed, rubber elasticity cushion cover (155) and lower end steel bushing (157), each section of steel bushing (154 of suit tandem is finally contained by an elongated outer steel sleeve (139), 156, 157).

Rotating shaft (101) upper and lower end adopts annular bearing with rolling contact supporting, and the rolling disc of axially mounting Permanent-magnet bearing is positioned in the middle part of rotating shaft, and pivot design is stiffness rotor, and its single order crooked critical rotary speed is higher than rated speed.

Rotating shaft lower end adopts a deep groove ball bearing (Figure 20), uses lubricating grease.Bearing both sides have magnet fluid sealing assembly (each electromagnetic pure iron ring with three teeth of neodymium iron boron ring and both sides thereof, and the magnetic current body fluid at crown place), and bearing and surrounding vacuum environment are isolated, and bearing bore is communicated with air.Bearing both sides also have the centrifugal separator (159) preventing lubricating grease to both sides movement.In the position of relative magnet fluid sealing assembly, rotating shaft is installed spacer (160,161), spacer adopts magnetic conductivity higher than the 45# steel of rotating shaft material, and to ensure to seal magnetic flux, spacer has the axially locating effect of related components simultaneously.Arrange rubber seal and vacuseal grease between spacer (160,161) and rotating shaft (101), spacer (160) is fixedly connected with also adopting method for welding between rotating shaft and seals.Upper and lower two cover magnet fluid sealing assemblies are separately fixed on bearing support (140) and end cap (158), junction surface employing adhesive is bonding and seal, adopt screw fastening between end cap and bearing support, and rubber seal and vacuseal grease are set.Bearing support (140), end cap (158), centrifugal separator (159) all adopt nonmagnetic substance aluminum alloy, to meet the requirement of magnet fluid sealing.

The deep groove ball bearing (Figure 20) of rotating shaft lower end is the free end bearing of non-axially locating, should ensure the axial free displacement of its outer ring, also will ensure that the load maintaining this bearing is not less than its minimum load in addition, in order to avoid cause serious sliding friction.For meeting above-mentioned two requirements, adopt following structural measure: bearing support (140) contacts with the upper-end surface of bearing outer ring, the external cylindrical surface of bearing support allows axial free displacement, the axial load that the total weight that bearing support, end cap (158), two overlap magnet fluid sealing assemblies and bearing outer ring is formed acts on bearing ball, and the bearing equivalent load that this axial load produces is not less than the minimum load of requirement.

Rotating shaft bottom end bearing adopts by the scheme (Figure 20) of outer steel sleeve (139) to support base power transmission, and the external cylindrical surface of bearing support (140) directly contacts with the interior cylindrical hole of outer steel sleeve.For ensureing the coaxality of upper and lower end bearing saddle bore, Combined machining upper and lower end bore is carried out to the correlated parts (139,153,154) comprising outer steel sleeve.

Rotating shaft upper end adopts a pair deep groove ball bearing (Figure 22), a spacer ring is set between the inner ring of two bearings, on the upper-end surface of upper bearing (metal) outer ring and under the lower end surface of lower bearing outer ring, arrange one respectively with tens supporting spacer rings along Zhou Junbu axial hole and built-in spiral compression spring thereof, make two bearing forming surface opposite bearing combinations, bear radial load and bi-directional axial load, and as axially locating end.Tens built-in spiral compression springs in supporting spacer ring, for ensureing that the equivalent load of each bearing is not less than the minimum load of requirement.The supporting spacer ring of lower end is by aluminum alloy end seat (162) spacing supporting, the supporting spacer ring of upper end is by Aluminum Alloy Cover (165) spacing supporting, aluminum alloy end seat (162) and steel bearing support (153) adopt seam to locate, and soldering is fixed and is sealed, arrange adjustment packing ring between Aluminum Alloy Cover (165) and steel bearing support, relative dimensions measurement result when now bearing reaches requirement pretension load in advance according to special frock during assembling is ground adjustment gasket thickness.Bearing lubrication uses lubricating grease, and bearing pack both sides have the centrifugal separator of the aluminum alloy material preventing lubricating grease to both sides movement.Be provided with the magnet fluid sealing assembly of six sealing teeth on the downside of bearing pack, vacuum environment residing for bearing and rotor is isolated, and bearing bore is communicated with air gas circuit.The magnet fluid sealing assembly of two sealing teeth is provided with on the upside of bearing pack.Magnet fluid sealing assembly is separately fixed on aluminum alloy end seat (162) and Aluminum Alloy Cover (165), and junction surface employing adhesive is bonding and seal.In the position of relative magnet fluid sealing assembly, rotating shaft is installed spacer (163,164), spacer adopts magnetic conductivity higher than the 45# steel of rotating shaft material, and to ensure to seal magnetic flux, spacer has axially locating and the intermal force of related components simultaneously.Arrange rubber seal and vacuseal grease between spacer (163) and rotating shaft (101), spacer (163) is fixedly connected with also adopting method for welding between rotating shaft and seals.The upper-end surface of spacer (164) is fastening by shaft end nut.The upper axle head of rotating shaft (101) is also connected for external equipment rotating shaft with external splines, and the internal thread also with central hole is used for mounting process.

For making flywheel rotating shaft (101) centerline in plumb position, adopt structure as shown in figure 22, the levelness that adjustment support plate (133) is installed with basis (134), the levelness of flywheel rotating shaft datum clamp face (135) is made to reach strict demand, simultaneously the relevant processing accuracy of form and position of strict Control Shaft bearing (153), outer steel sleeve (139), fan-shaped cushion block (166), fan-shaped adjustment backing plate (167).Fan-shaped cushion block (166) is along Zhou Junbu, install when starting and wouldn't use, the connection with annular chains is completed in rotating shaft lower end, and after completing annular chains and being seated the flywheel wheel body of bottom and the connection of central shaft, to be sling whole rotor (comprising the whole stator parts within bearing support (153) and outer steel sleeve (139)) by the lifting device being arranged on axle head internal thread in rotating shaft, or bottom flywheel wheel body central shaft, adopt the flywheel wheel body that the first jack-up of hydraulic jack is the heaviest, sling again and stretch whole rotor, fan-shaped cushion block (166) is installed afterwards from the side.Along Zhou Junbu, the fan-shaped adjustment backing plate (167) of installing from the side for adjusting the gap length between axially mounting Permanent-magnet bearing rolling disc and stationary disk, thus adjustment magnetic attraction size.When assembling stationary disk and the rolling disc of Permanent-magnet bearing one by one, stationary disk is drawn onto on rolling disc, owing to being provided with more closely spaced spacing chimb in the inner edge of two dish opposing end surfaces and outer rim place, air gap when two dishes hold mutually still retains the specified air gap distance of about half, make magnetic attraction now unlikely excessive, be beneficial to the debugging operations to magnetic attraction.

The vacuum vessel housing being fixedly installed in basis (134) is up-thin-low-thick ampuliform (Figure 23), there is upper, middle, and lower part, bottom is made up of bottom ellipsoidal head and bottom cylindrical section, middle part is oval closing in, and top is made up of cylindrical section and support plate (133).Bearing support (153) is also the end socket of vacuum vessel simultaneously.Vacuum vessel housing is arranged in the dell of underground.Middle part and lower case arrange Flange joint, and top and central enclosure arrange Flange joint, and the sequencing of installation is: lower case, wheel body and central axis component, central enclosure, basis (134), upper body, all the other spare parts.Between middle part and lower case, flange connections outer ring (Figure 23 between top and central enclosure, enlarged view I), be provided with soldering ring cavity wall construction, the thin-wall annular part (168 at two ends, 170) be first welded and fixed with thick wall shell, at the scene install and Flange joint fastening after, on-the-spot soft soldering method is adopted to weld middle thin-wall annular part (169) and the thin-wall annular part (168 at two ends, 170), to ensure reliable vacuum seal, again that semi-detachable seals and is connected simultaneously, when thin-wall part wherein and two ends transition structure are mainly for preventing on-the-spot soldering, heat loss is too fast.Between support plate (133) and bearing support (153), be provided with the soldering ring cavity wall construction (Figure 22) containing all junction surfaces between the former two, the thin-wall annular part (171 at two ends, 173) elder generation and bearing support, support plate is welded and fixed, container do not vacuumize with rotor static conditions under determine fan-shaped adjustment backing plate (167) thickness and complete bearing support (153) and outer steel sleeve (139) fastening after, on-the-spot soft soldering method is adopted to weld middle thin-wall annular part (172) and the thin-wall annular part (171 at two ends, 173), to ensure the reliable sealing to external member, and can remove and reuse when needs adjust fan-shaped adjustment backing plate (167) thickness further.

Claims (12)

1. an accumulated energy flywheel device, comprise: the rotary wheel of one or more sets series connection, a rotating shaft (101), bearing in rotating shaft, contain the housing of vacuum in wheel body, chamber, it is characterized in that: shaft centerline is perpendicular to ground, cod in rotating shaft adopts one group of axially mounting Permanent-magnet bearing, wheel body is positioned at the lower end of rotating shaft, wheel body is connected with central shaft (102), central shaft is connected by bearing torsion pass flexible drive parts with rotating shaft lower shaft end, and wheel body is suspended on below rotating shaft.

2. flywheel gear as claimed in claim 1, it is characterized in that: bear torsion pass flexible drive parts and adopt a set of universal drive shaft, comprise two universal joints, the shaft axis of two revolute pairs of universal joint intersects vertically, or is vertically staggered.

3. flywheel gear as claimed in claim 1, it is characterized in that: bear torsion pass flexible drive parts and adopt annular chains (Fig. 8, Fig. 9), upper and lower end respectively adopts half annulus (Fig. 5), the one or more annulus of middle employing, each annulus is made up of (Fig. 6) upper and lower two semi-rings and middle two straight sections lengthened, or also has the lateral connection beam (Fig. 7) strengthened between these two straight sections.

4. the flywheel gear as described in claims 1 to 3, it is characterized in that: one group of axially mounting Permanent-magnet bearing has the axially mounting Permanent-magnet bearing of one or more series connection, an axially mounting Permanent-magnet bearing has a rolling disc and a stationary disk, rolling disc is positioned at the top of stationary disk, an air gap is had between the sides adjacent end face of two dishes, rolling disc is axisymmetric magnet structure, or the mixed construction of axisymmetric soft magnetic bodies and axisymmetric permanent magnet, or axisymmetric non-magnetizer, the mixed construction of axisymmetric soft magnetic bodies and axisymmetric permanent magnet three, stationary disk is axisymmetric magnet structure, or the mixed construction of axisymmetric soft magnetic bodies and axisymmetric permanent magnet, or axisymmetric non-magnetizer, the mixed construction of axisymmetric soft magnetic bodies and axisymmetric permanent magnet three, the magnetic circuit that magnetizes of above-mentioned all permanent magnets is also axially symmetric structure, the magnetic pole that on two dish sides adjacent end faces, same radius place is relative is contrary, magnetic repulsion upwards acts on rolling disc, design the gravity being used for offsetting rotor.

5. the flywheel gear as described in claims 1 to 3, it is characterized in that: one group of axially mounting Permanent-magnet bearing has the axially mounting Permanent-magnet bearing of one or more series connection, an axially mounting Permanent-magnet bearing has a rolling disc and a stationary disk, rolling disc is positioned at the below of stationary disk, an air gap is had between the sides adjacent end face of two dishes, rolling disc is axisymmetric soft magnetic bodies structure, stationary disk is axisymmetric magnet structure, or the mixed construction of axisymmetric soft magnetic bodies and axisymmetric permanent magnet, or axisymmetric non-magnetizer, the mixed construction of axisymmetric soft magnetic bodies and axisymmetric permanent magnet three, the magnetic circuit that magnetizes of above-mentioned all permanent magnets is also axially symmetric structure, magnetic attraction upwards acts on rolling disc, design the gravity being used for offsetting rotor.

6. the flywheel gear as described in claim 1 to 5, it is characterized in that: wheel body is many bodies axially symmetric structure, a set of wheel body contains one or more quality bulk (53) and at least one supporting mass (54), the quality bulk being called structure in a set of wheel body and supporting mass are disposed in order successively with the little loop type of big ring sleeve, quality bulk is positioned at outmost turns and time outer ring of rotation, supporting mass is positioned at the inner ring of quality bulk, the fiber-reinforced polymer that quality bulk is wound around by circumference is formed, adopt axisymmetric flexible zona (55, 58) adjacent inner ring and outer ring structure body is connected, a ventricumbent end face of outer ring structure body is placed on a supine end face of inner ring structure body, two end faces composition load-bearing end face pair (56).

7. flywheel gear as claimed in claim 6, it is characterized in that: a supine end face of outer ring structure body is placed in the below of a ventricumbent end face of inner ring structure body, the restriction of two end face compositions is to the end face pair (57 of top offset, 64), this end face pair can be designed as together with central combination with load-bearing end face pair, forms boss and recessinterengaging means.

8. the flywheel gear as described in claim 6,7, is characterized in that: adopt two groups of flexible zonas (55,58) to connect adjacent inner ring and outer ring structure body, the axial span of the two maximizes design.

9. the flywheel gear as described in claim 6 to 8, is characterized in that: flexible zona (55) installment state does not prebend distortion, and flexible zona material is elastic material, comprises rubber material.

10. the flywheel gear as described in claim 6 to 8, is characterized in that: flexible zona (58) installment state has distortion of prebending, flexible zona material or be elastic material, or is the composite material of elastic material and radial reinforcing fiber.

11. flywheel gears as claimed in claim 10, is characterized in that: flexible zona (58) installment state has circumferential tension distortion in advance.

12. flywheel gears as described in claim 1 to 11, it is characterized in that: supporting disk (62) is installed between central shaft and the supporting mass (54) of innermost circle, the central bore of supporting disk is connected with central shaft interference, the dish body of supporting disk is positioned at below the supporting mass of innermost circle, therebetween be provided with elastic material ring (63), the latter to be gluingly connected with the two.