CN101709765A - Steel-structure disk stacked flywheel - Google Patents

Abstract

The invention relates to a high-speed-steel structure flywheel which is mainly used for storing energy. The steel-structure flywheel is stacked by a plurality of solid thin disks, and each disk is processed by heat treatment before assembling. The disks with small axial thicknesses can be completely quenched quickly to achieve full-hard state and high tensile strength. Each disk is processed or ground to mold, and assembled into a flywheel with a large axial thickness, thereby storing several kilowatt-hours or more energy. The flywheel can be assembled by a welding, hard soldering, soft soldering, binding or interfering method. The incipient crack of a single disk can result in a catastrophic failure when the flywheel rotates. However, the disk stacking method can minimize the possibility of the catastrophic failure by limiting the axial crack extension of a single disk, which enables one or a plurality of disks to support the disk with a crack, until the flywheel can slow down safely.

Description

A kind of steel-structure disk stacked flywheel

Technical field

The present invention relates to a kind of high speed steel flywheel that is used for the energy storage, this flywheel is mainly used in a large amount of energy storage systems of the thousands of watt-hours of storage to the number megawatt hour.

Background technique

In decades, flywheel uses as a kind of equipment of energy storage always.Flywheel often is applied in the dynamically filtering device and other power equipment of internal combustion engine.Recently, in fields such as uninterruptable power supply (UPS), public load corrector system, alternator, satellite and electric locomotive, flywheel technology is considered to an energy storage technologies that haves a great attraction.

Current, the flywheel energy storage system is conversion back and forth between the rotor kinetic energy of rotary flyweights and electric energy.Flywheel energy storage system comprises flywheel, motor/generator, bearing arrangement and vacuum vessel.The flywheel of rotation has been stored mechanical energy; Under the supporting of bearing arrangement, motor/generator is changed the energy of the flywheel of rotation between electric energy and mechanical energy.The flywheel of high speed rotating is generally deposited in the container of vacuum or low pressure to reduce windage loss.

Compare with electrochemical cell, flywheel has two major advantages: long and reliability height of life-span.Electrochemical cell, especially lead-acid battery life-span are shorter, and the general life-span is between 2-7.This class battery needs periodicmaintenance, unpredictable startup failure phenomenon can occur and environment is polluted.Compare, the life-span of flywheel energy storage system is 20 years at least, and needing seldom or not needs to safeguard.When considering lifetime of system, compare with chemical battery, this performance can be offset the higher initial stage of flywheel energy storage system and drop into and the material benefit more economically that becomes.

Although fly wheel system has many performance advantages, for can be as the alternative of electrochemical cell, fly wheel system must be designed to maximum energy storage and have minimum loss simultaneously.Composite material (carbon fiber/epoxy resin, glass fibre/epoxy resin) flywheel is considered to the means of low-cost kinetic energy storage.Composite material has very high hoop intensity.Adopt up-to-date manufacturing process, the cost of composite material will reduce.Fiber itself has very high intensity, this viscose is lumped together the flywheel material of formation, can further improve the intensity of flywheel, the flywheel of this made has in itself with the same intensity of composite material, can accomplish muchly to have much dimensionally.Yet as a kind of raw material, steel is than composite material considerably cheaper.Unfortunately, there are some problems in steel-structure flywheel when storing big energy effectively.Owing to the high hardness performance of this steel structure, successfully made the small-power steel-structure flywheel, this flywheel has been realized high speed rotating.Yet, in high-power steel-structure flywheel, must store big energy, approximately be 5-10 kilowatt hour or more, steel can not be as a kind of effective flywheel material.Although the large scale flywheel has identical stress with the small size flywheel when same linear velocity is rotated,, problem is that the tensile strength of large scale flywheel has reduced significantly.Compare with the small size flywheel, even select the model and the manufacturing process of steel carefully, the intensity difference of large scale flywheel has seldom reduced half.The phenomenon that the intensity that large-scale steel structure produces reduces not is that flywheel is distinctive, but the universal phenomenon in a lot of the application.Yet the load during great majority are used and other demands do not have to go wrong because of the reduction of intensity.

The intensity of steel is directly relevant with its hardness, and this depends on the martensite concentration of steel inside.The hardness of steel can be strengthened and controls by heat-treated steel.In order to satisfy the hardness demand, need steel is heated to austenitic temperature cooling or quenching rapidly then.Temper grade depends on the hardness of the steel of needs.In thick steel structure, have only the speed cooling of material surface, to such an extent as to reduced because heat reaches the middle rate of cooling of the slow material of heat conduction velocity more with maximum.Therefore, the volume of steel structure is big more, and is inner big more apart from the distance on steel structure surface, and its hardness and tensile strength are just low more.The inner degree of depth to the surface of steel structure has surpassed certain distance, and its inner hardness and intensity will reach the lowest limit of this kind shaped steel, and above after the lowest limit, the intensity of steel and hardness will not reduce.For realizing the quenching intensity of certain level, the ability of a kind of steel of particular type acquisition hardness is called the hardening capacity of steel.Hardening capacity is relevant with the percentage composition of carbon and other alloying elements (as chromium, molybdenum, nickel etc.).Therefore, common first-selected high alloy steel is as the heavily stressed parts of large scale.Although the size of parts is bigger, higher hardening capacity makes parts obtain higher intensity becomes possibility.It should be appreciated that in most of structures, load is at first crooked.Therefore, maximum stress appears at the surface of structure, and intrinsic maximum stress is corresponding to the maximum strength part of steel.In these cases, the depth of hardness is not an important problem.Steel part after the quenching will be too crisp and can not use, and therefore needs tempering.Tempering is steel to be heated to be lower than austenitic temperature and keep a kind of heat treatment process that a period of time cools off then.The result of tempering makes the hardness of steel structure and tensile strength reduce, and internal stress remnants significantly reduce, and toughness improves greatly.

Steel-structure flywheel is unusual pressure texture.In order to obtain maximum energy storage density, usually flywheel design is become cylindrical body.This design makes and radially to equate with circumference stress and in the center maximum.Yet the center also is the place of steel structure intensity minimum, as explained before, can not be quenched fully in this position.Can use high alloy steel for the inside darker on distance flywheel surface obtains higher intensity, but for thickness and the diameter flywheel greater than several inches, intensity and energy storage capability that the center obtains have reduced significantly still.Thickness and diameter are had only 10 inches steel-structure flywheel, and to the center, intensity difference seldom reduces half from its surface.In the large scale flywheel, toughness also can reduce, because the steel incomplete quenching can not reach maximum toughness between hardening period.High alloy steel and very high ALLOY STEEL TOOLS use oil quench or even gas quenching, this relaxes than the degree with water quenching.Because heat conduction velocity can significantly not increase below the parts surface number inch, so replace oil quench with extreme water quenching, can not increase the depth-hardened and the center intensity of steel structure, the higher quenching velocity of water and high alloy steel will produce extreme stress remnants on the surface, even might make the steel loop fracture.

According to cost of material, as the low-down energy storage of cost flywheel, steel has very big hope.Current, small size steel flywheel has special intensity and energy storage capability on cost per unit.Yet, when the size that increases flywheel when storing big energy, the performance of flywheel has significantly reduced.

Summary of the invention

In order to solve the defective that the cylindrical body flywheel exists, the present invention has designed a kind of steel-structure disk stacked flywheel.

The technical solution adopted for the present invention to solve the technical problems is: a kind of steel-structure disk stacked flywheel, comprise cylindrical body flywheel and the axle that is arranged at cylindrical body flywheel axle center, described cylindrical body flywheel has a plurality of steel-structure disks to be laminated, adjacent discs is fixedly connected, the upper and lower surface of cylindrical body flywheel is set with end plate, and axle is fixedlyed connected with end plate.

It mainly takes following three kinds of modes with the stacked fixing mode of disk:

Mode one: uniformly on the described end plate circumference be provided with at least two axial bolt, axial bolt runs through disk, by tightening up axial bolt disk is pressed between the end plate.

Mode two: the outer rim junction surface place of described adjacent discs is provided with technology groove, by welding or bonding mode disk is linked together then.

Mode three: the junction plane of described adjacent discs is provided with chimeric concaveconvex structure mutually.Concaveconvex structure adopts transition fit to guarantee chimeric soundness usually.

Certainly,, guarantee the overall operation balance, also can take the combination in any of above-mentioned three kinds of Placements in order further to improve the reliability that connects between disk.

The present invention provides high-speed-steel structure flywheel for the flywheel energy storage uninterruptable power source, has reached maximum intensity and energy storage capability in the large scale flywheel.By using a plurality of flywheel shafts to stacked structure, this flywheel had overcome before heat-treats the high-intensity deficiency of acquisition to the large scale flywheel.Replace single cylindrical method to make up novel flywheel with piling up several steel-structure disks.Each flywheel has all carried out heat treatment (normally austenitizing, annealing and tempering) before assembling.Because the axial thickness (typical thickness is between 0.25 inch and 6 inches) that each disk is thin, each layer disk can both quench fully at a high speed and sclerosis fully.Higher quenching velocity makes flywheel have high tensile strength with the martensitic structure that spreads all over flywheel.The intensity at flywheel center has reached the intensity of previous flywheel outer radius.Process or grind each layer steel-structure disk, assembling forms axial thick flywheel and is used for storing thousands of watt-hours or more energy then.For the maximum return that obtains inventing, on disk, do not bore a hole, promptly axially there is not through hole.These disks are by welding, hard soldering, soldering, tackiness agent or interface assembling.In case assembling, its final size and balance adjustment before build-in services just can be processed or grind to whole flywheel.The tensile strength of the flywheel of invention approximately is that the twice and the rotational speed of traditional single structure large scale flywheel improved 37% than originally, and stored energy is than having howed 89% originally.

Description of drawings

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is the front view of steel cylindrical body flywheel.

Fig. 2 is the hardness correspondence table of flywheel tensile strength and steel.

Fig. 3 is the correspondence table of flywheel allowable stress and steel structure hardness.

Fig. 4 is the front view of steel disk flywheel.

Fig. 5 is the stress and the intensity contrast figure of steel-structure disk and cylindrical body flywheel.

Fig. 6 is the front view that axially piles up the flywheel disk that has central shaft, and is different with the structure of invention.

Fig. 7 is the stress curve figure that axially piles up the flywheel disk that has central shaft among Fig. 6.

Fig. 8 is the front view that axially piles up the flywheel disk that has axial bolt.

Fig. 9 be have central shaft axially pile up flywheel disk screw place radially with circumference stress and corresponding screw radial position plotted curve.

Figure 10 is and the corresponding front view that axially piles up the flywheel disk of the present invention.

Figure 11 is and the corresponding front view that axially piles up the flywheel disk that has axial tie layer of the present invention.

Figure 12 is and the corresponding part front view that axially piles up the flywheel disk that assembles connection interface that has of the present invention.

Figure 13 is and corresponding flywheel disk energy storage capability and the steel hardness comparison diagram of axially piling up of the present invention.

Figure 14 is and the corresponding flywheel disk energy storage system part principle assumption diagram that axially piles up of the present invention.

Embodiment

Figure 1 shows that the steel-structure flywheel 30 that is used for flywheel energy storage system.In most cases steel-structure flywheel 30 is made up of large scale cylindrical body 31 and last lower shaft 32.If the diameter and the thickness of cylindrical body 31 parts bigger (each dimension has surpassed several inches), the intensity at steel structure radial center place can significantly be lower than maximum strength.Radial center also is the place of flywheel stress maximum.Owing to can not quench to steel structure inside effectively, so the intensity of center will be lower than the intensity of external diameter surface.The roulette speed of heavy-gauge steel structure flywheel will be lower than the small size steel-structure flywheel, so both energy of unit mass storage are also unequal.

Because the low-cost degree of depth hardening capacity of 4340 steel, so the material of steel-structure flywheel 4340 alloyed steels preferably.During oil quenching, the maximum Rockwell hardness number of widget approximately is 60.Can obtainable Rockwell hardness number can be reduced to 34 to diameter greater than 9 inches big parts.Usually too crisp can not directly use of steel after quenching must tempering make its hardness be increased to acceptable level.The small scale structures Rockwell hardness number has been reduced to 42, and large scale structure Rockwell hardness number is 32.Intermittently use lower tempering temperature to make undersized Rockwell hardness number about 52 as about 400 °F, large-sized Rockwell hardness number is about 32.The selection of tempering temperature has caused the compromise between steel structure tensile strength and the hardness.Non-4340 model steel also can increase hardening capacity, and are high 4 times but their price is wanted as the lathe steel, also are being restricted aspect the in-depth hardness simultaneously.The discharge time that depends on flywheel, the allowable stress of those steel also can reduce.

Fig. 2 shows that the tensile strength of steel is directly related with hardness.To a given heat treatment process, it is 32 and the about tensile strength of 146ksi that one 10 inches 4340 thick steel-structure flywheel centers can obtain Rockwell hardness number.If flywheel is made up of 2 inches thick disks, the flywheel center Rockwell hardness number that will obtain is 52 and the about tensile strength of 275ksi so.Can see clearly that from figure in order to obtain high intensity, steel-structure flywheel preferably is made of axially thin disk, the thickness of disk is between the 0.25-2 inch.Curve top is corresponding with not tempered steel, and its Rockwell stress approximately is 60, but this steel is very hard also very crisp, so can not be applied to this occasion.

Fig. 3 is the corresponding curve of allowable stress and hardness in the flywheel, and wherein allowable stress is that tensile strength among Fig. 2 is divided by 1.5.Setting factor of safety is 1.5, is a kind of simple method, shows that flywheel rotates under allowable stress.10 inches thick cylindrical allowable stresses approximately are 97ksi, and the allowable stress of 2 inches thick disks approximately is 183ksi.Another kind of available method is to use yield stress and selects different safety coefficient.The selection of safety coefficient should be able to be guaranteed flywheel safe operation in the time in working life of expectation.When surpassing the working life of fly wheel system, according to the application of flywheel, practical operation will cause the discharge cycle of some.Use discharge cycle and depth of discharge information and utilize fault mechanics can obtain the size of allowable stress in service more accurately.In this case, the size that not only will consider the flywheel internal flaw also will be considered the hardness of flywheel.The possibility of result of this method be by tempering fully hardened steel structure flywheel to low-intensity and intrinsic high tenacity state to obtain maximum allowable stress.For general steel flywheel, should have greater than the tensile yield strength of 100ksi simultaneously greater than 70ksi (in) ^1/2Plane strain fracture toughness.Numerical value is the bigger the better.

Among Fig. 4, high-performance steel disk flywheel 40 is higher than the rotating speed of cylindrical body flywheel 30 among Fig. 1.Steel-structure disk flywheel 40 comprises steel-structure disk 41 and axle 42.Axial component is thin more, and the tensile strength at flywheel center is high more.Unfortunately, when the diameter of flywheel was no more than certain size, the energy of its storage was less, and therefore this design is not suitable for being applied to big energy storage.

Shown in Figure 5, steel-structure disk flywheel and cylindrical body flywheel radially and circumference stress, two flywheels have identical diameter (greater than 9 inches) and identical roulette speed (640 meter per second).Yet, because the low hardness and the allowable stress of tensile strength cylindrical body flywheel reduce along radial direction.The strength distribution curve approximately linear, however in fact, strength distribution curve is not linear but asymptote.The allowable stress of steel-structure disk flywheel is a constant and equals the maximum value that cylindrical body flywheel external diameter obtains.This figure further shows, uses the disc structure flywheel can reach higher rotating speed and the storage of more effective energy.

In order to store the effective simultaneously steel that uses in the flywheel of lot of energy, can become flywheel design a plurality of steel disks to pile up the structure that forms.Before assembling, earlier disk is quenched.As shown in Figure 6, the flywheel 50 that axially piles up formation is fixed together a plurality of thin disks 51 by central shaft 52 and end cap 53.Yet central shaft 52 has penetrated the center of each disk 51, therefore, compares with the flywheel that does not have axial bore, and this flywheel 50 does not have the energy of identical rotational speed and storage as much.The configuration of axially piling up steel-structure flywheel that has central shaft among Fig. 6 is worthless.As shown in Figure 7, stress pattern shows, additional hole, center can cause that the radial stress of this point is 0 and circumference stress doubles.Shown in Figure 5, circumference stress was not 183ksi when circumference stress had the hole near 366ksi when the center was porose.Under the both of these case, maximum linear velocity all is 640 meter per seconds.

In order to eliminate center hole, a kind of method is to assemble these disks by screw, and as shown in Figure 8, design has off-centered axial bolt in axial stack disc structure flywheel 60.In most of the cases, flywheel 60 is made up of multi-layer discs 61 and axle 62.By the axial bolt 64 that runs through disk 61 disk 61 is fixed together.This design can not reach maximum speed and energy storing value.Shown in Figure 9, for same disk flywheel, no matter the radius of axial bolt and position are how, the circumference stress at place, hole is apparently higher than allowable stress.At the center, the situation that has central shaft among the stress of screw hole and Fig. 7 is identical.3 times of the difference of the circumference stress of the disk mesopore radial stress that is the same position circumference stress when not having the hole.Similarly, the radial stress in hole be same position when not having the hole radial stress and 3 times of the difference of circumference stress.

Flywheel of the present invention is that relatively thinner steel-structure disk is not processed through hole in each disc centre axially sticking together, and makes flywheel reach maximum speed and ceiling capacity storage.Figure 10 is a reasonable structure of this invention, and in this scheme, flywheel 70 is made up of a plurality of flat-disk 71, axle 72 and end cap 73.The flywheel disk preferably forges and the roughing moulding, and heat treatment obtains high hardness and tensile strength then.Then these disks 71 are axially piled up and weld together in outer radius.Also can adopt other connecting means, as bonding.As shown in the figure, flywheel disk 71 can be designed to fillet or external diameter corner cutting 74 stay the welding space and make to connect technology and be more prone to, but these disks 71 are not the designs of " Chang Yingli " disk.Fillet or the cutting of external diameter corner 74 allows the processing of the external diameter of the flywheel 70 of assembling or grinds to form final size and do not need to break flywheel 71.Axle 72 can directly be connected on the end plate 71 of upper and lower sides.As selection scheme, as long as disk 71 does not have the degree of depth in through hole and hole that axial thickness is not had remarkable influence, disk end plate 73 can be by screw on disk 71.Because the rotation stress that the diameter of end plate 73 is little and produce is little, so leave the screw through hole on the flat board 73 endways.

Disk preferably forges into the flat-disk shape.Forging has increased the radially strong hardness of disk.If exist in the disk and add the raw material that have flaw man-hour and the defective that causes, this defective will be the most possible defective that exists.Catastrophic failure appears in the original crack of single disk in the time of can causing the flywheel rotation, disk stacked method makes adjacent one or more disks be supported with the disk of crackle by the axial crack expansion that limits single disk, can minimize the chance that this catastrophic failure occurs, can slow down safely up to flywheel.

The method of another kind of clutch disk is to add axial tie layer between disk, as shown in figure 11, and in order to make an axial coupling shaft to piling up disc type flywheel 80.Flywheel 80 is made up of a plurality of disk 81, axle 82 and end plate 83 of piling up.In this scheme, by welding or the axial clutch disk 81 of use goo.Also can use other connecting means.If do not need to separate disk 81, can finish by last processing or the method for milling.

Shown in Figure 12 is the assembly method that a kind of interfere type axially piles up the disc structure flywheel.Flywheel 90 is made up of multi-layer discs 91, axle 92 and end plate 93,96.In this scheme, the projection 94 and the groove part 95 of adjacent discs axial surface are assembled together.Projection 94 and groove part 95 can be wide up and down or be diminished gradually, can assemble by axial reinforcing or heat shrink mode.Interfere and connect the connection that keeps when enough height that must design make the flywheel high speed rotating between each disk 91.The circumference stress of warp can not surpass allowable stress in the groove.Groove 95 is should be than disk 91 axial thicknesss little and innerly should rounded corner be arranged so that the minimise stress of assembling on the groove.Can before and after heat treatment, process projection 94 and groove part 95.According to deformation extent in the heat treatment and the interference tolerance of considering, before installing, also to carry out last processing.Can also adopt additive method that projection is connected with groove part, as using fibre threads.Yet the cost of this method is higher.Also can use epistasis glue such as epoxy, in this case, disk 91 tempering will be carried out before the assembling disk becomes flywheel 90.Epoxy will remain in flywheel inside, so getter action will minimize.

The corresponding relation of flywheel between flywheel energy storage ability and steel hardness of two same sizes (14 inches of diameters, thick 10 inches) different structure as shown in figure 13.One is traditional single structure cylindrical body flywheel, because this structure, the hardness at flywheel center can only reach 32, and allowable stress is 97ksi.When maximum permission speed, the flywheel rotating speed is 25,000 rev/mins (465 meter per seconds), stored energy 2.84 kilowatt hours.Second flywheel uses the structure among the present invention, piled up by 52 inches thick disks to form.The Rockwell hardness that disk reaches is 52, and the allowable stress of whole flywheel is 183ksi.According to tensile strength hypothesis safety coefficient is 1.5.When the speed that maximum allows, the flywheel rotating speed is 34.3 dried rev/min (640 meter per seconds), and stored energy is 5.36 kilowatt hours.Use this invention can make the rotating speed of flywheel increase by 37%, corresponding energy storage increases nearly 89%.The flywheel of invention is specially adapted to store and surpasses 10 kilowatts energy, can reach several megawatts at most.

Comprise the single hard steel-structure disk of assembling with the manufacturing process of the corresponding flywheel of the present invention.Course of working comprises the forging steel-structure disk.Although can use additive method such as rolled steel, to forge and can produce the most rational center, the axial forging of disk can produce radially mobile with the particulate of hoop, and this also is the direction of maximum stress.The thickness of suitable selector disc makes flywheel finally have good performance.A kind of method of selector disc axial thickness is an axial thickness less than 2 times of the ideal critical diameter of steel.Ideal critical diameter is the maximum diameter of the long column body that can harden fully.Its approximative value can service manual ASTM A-255 alloy in the tabulation multiply by coefficient and obtain.For multiple steel commonly used, the disk axial thickness is between the 0.25-6 inch.

After the forging, need carry out roughing to eliminate the weld seam that in heat treatment, may cause the disk fragmentation to disk.Then disk is heat-treated and quench to deepen its inner martensitic structure.According to the composition difference of alloy, the quenching condition of dissimilar steel is also different, and the heat treated kind of using before quenching is not limit, as long as this heat treatment can improve hardness.Then these disk tempering are increased their intensity and reduce residual stress.Can after assembling, carry out tempering.Yet stoping the best way that occurs breaking is that tempering directly becomes quenching, because steel is frangible after full hardening.Process disk again and eliminate the distortion that occurs in the heat treatment, under a stable condition, also can obtain some characteristics axial notch that is used to assemble and convex portion as shown in figure 12, disc set is dressed up flywheel.Can in the end process or balance if desired.In order to ensure the safe operation speed of maximum, can after quenching and tempering, carry out nondestructive assessment to disk, prevent to use defective to exceed the disk of greatest drawback size.Flaw size should be less than 0.125 inch, and this size is to detect.The invention that use provides not only can be gained in strength greatly, pile up a plurality of disc set and dress up the cost that flywheel can reduce flywheel, because can discern whether defectiveness of flywheel by non-destructive inspection, defective flywheel will can not be used, and can reduce the cost of whole big flywheel like this.Can also use ultrasound or X ray to detect the flywheel that assembles.This method can detect the situation of axial connection, but the difficult detection of the defective of material internal.

Figure 14 shows that the flywheel energy storage system construction drawing of design according to the present invention.Fly wheel system 110 is made up of the steel-structure flywheel 111 that single disk is assembled.Flywheel 111 rotates in the vacuum vessel 112 that exhaust port 113 is housed to reduce resistance of air.The fly wheel system of low cruise can move in the container of helium is housed.Flywheel 111 is connected to end plate 119,120 by axle 116,117.Axle 116,117 bearings 115,118 by upper and lower sides are supporting the flywheel rotation, and bearing is positioned at 121,122 li of bearing bracket stands.Among the figure, flywheel 111 also can be around other axle rotations around the vertical central axis rotation.Stored energy when flywheel 111 quickens by motor/generator 123, release energy when slowing down.The rotor 125 of motor/generator 123 is connected on the axle 116 of flywheel; Rotor 125 and stator 124 collaborative works that are installed on the stator frame 122.Though motor/generator 123 integrates among the figure, also can separate motor and generator.Also can be flywheel 111 rotors 125 own as motor/generator 123.Like this, the flywheel disk will have other characteristics such as another side and projection be arranged to promote transformation of energy.The axial connection of disk can reduce loss of field.

Connection does not have multiple scheme with the flywheel disk of central through bore among the present invention.Enormous amount and can not listing fully.Use 2 inches 4340 thick steel disks although specified, also can use the steel of other types simultaneously.The hardening capacity of steel is high more, and the disk of permission is thick more, also can reach identical performance simultaneously.Similarly, use the carbon steel of low-cost, low hardening capacity to be processed into the thinner disk of axial thickness, also can be stacked into flywheel.In all schemes in the invention, the shape of flywheel can be circle or difform.In most of the cases, circular flywheel has optimum performance and minimum manufacture cost.

Claims (4)

1. steel-structure disk stacked flywheel, comprise cylindrical body flywheel and the axle that is arranged at cylindrical body flywheel axle center, it is characterized in that: described cylindrical body flywheel has a plurality of steel-structure disks to be laminated, adjacent discs is fixedly connected, the upper and lower surface of cylindrical body flywheel is set with end plate, and axle is fixedlyed connected with end plate.

2. steel-structure disk stacked flywheel according to claim 1 is characterized in that: uniformly on the described end plate circumference be provided with at least two axial bolt, axial bolt runs through disk.

3. steel-structure disk stacked flywheel according to claim 1 is characterized in that: the outer rim junction surface place of described adjacent discs is provided with technology groove.

4. steel-structure disk stacked flywheel according to claim 1 is characterized in that: the junction plane of described adjacent discs is provided with chimeric concaveconvex structure mutually.

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