CN205249083U - Low frequency vibration electromagnetic energy collector - Google Patents
Low frequency vibration electromagnetic energy collector Download PDFInfo
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- CN205249083U CN205249083U CN201520956231.XU CN201520956231U CN205249083U CN 205249083 U CN205249083 U CN 205249083U CN 201520956231 U CN201520956231 U CN 201520956231U CN 205249083 U CN205249083 U CN 205249083U
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Abstract
The utility model provides a low frequency vibration electromagnetic energy collector, produce piece and multi turn coil including energy collector casing, cantilever beam long slab, cantilever beam short slab, collision quality piece, magnetic field, the vibration ring border provides the vibrational excitation and gives energy collector casing, the cantilever beam long slab with the cantilever beam short slab is followed the vibrational excitation concurs the vibration, collision quality piece is right the preset position of cantilever beam long slab bumps, makes the cantilever beam long slab produces the vibration of being close its natural frequency own, multi turn coil with the vibration of the same frequency of cantilever beam long slab, cutting magnetic induction line, the signal of telecommunication of production. The utility model discloses an electromagnetic energy collector has been realized low frequency vibration electromagnetic type energy and has been collected to the next low frequency energy who has greatly improved electromagnetic type cantilever structure collects the bandwidth through the mode of collision.
Description
Technical field
The utility model belongs to energy collection technology field, more specifically relates to a kind of low-frequency vibration electricityMagnetic energy collector.
Background technology
Vibration is a kind of basic physical phenomenon of nature. Utilize vibrational energy to be converted into the mode of electric energyFor collection of energy have multiple, such as piezoelectric type, condenser type and electromagnetic type etc. Wherein condenser typeCollection of energy need to arrange separately preliminary filling power supply, and piezoelectric type energy is collected work complexity processed.
For electromagnetic type collection mode, along with device architecture microminiaturization causes the device intrinsic frequency utmost pointLarge increasing, therefore causes the collection of energy of low-frequency vibration, particularly lower than the vibration frequency of 60Hz,Exist collection of energy industrialization to realize bottleneck.
Therefore be badly in need of a kind of technical scheme and can effectively realize the collection of low-frequency vibration electromagnetic energy,Work processed and simple in structure simultaneously.
Utility model content
The technical problems to be solved in the utility model is how effectively to realize low-frequency vibration electromagnetic typeCollection of energy, simultaneously work processed and simple in structure.
In order to solve the problems of the technologies described above, the utility model provides a kind of low-frequency vibration electromagnetic energyCollector, described low-frequency vibration electromagnetic energy collector comprises energy harvester housing, cantilever beamLong slab, cantilever beam short slab, collision mass piece, magnetic field generating member and multiturn coil;
One end of described cantilever beam long slab be fixed on described energy harvester housing a side inSurface, the other end of described cantilever beam long slab be fixed with described multiturn coil; Described cantilever beamThe inner surface of the side of fixing described cantilever beam long slab, described cantilever beam are fixed in one end of short slabShort slab be positioned at described cantilever beam long slab directly over, and described cantilever beam short slab and described cantileverBeam length plate is parallel, and the lower face of the other end of described cantilever beam short slab is fixed with described collision massPiece, the described cantilever beam long slab preset distance of described collision mass piece distance; Described magnetic field generating memberThe inner surface of fixing and described energy harvester housing, and cutting when the motion of described multiturn coilThe magnetic induction line of described magnetic field generating member;
Vibration environment provides vibrational excitation to described energy harvester housing, described cantilever beam short slabVibrate with described vibrational excitation, described collision mass piece is to described cantilever beam long slab simultaneouslyPrecalculated position bumps, and described cantilever beam long slab is produced approach shaking of itself intrinsic frequencyMoving, described multiturn coil is with the frequency vibration identical with described cantilever beam long slab, cutting magnetic induction line,The signal of telecommunication producing.
Preferably, described low-frequency vibration electromagnetic energy collector also comprises wire, described wire withDescribed multiturn coil connects, and derives for the signal of telecommunication that described multiturn coil is produced.
Preferably, described low-frequency vibration electromagnetic energy collector also comprises load resistance, described negativeLive resistance is in parallel with described multiturn coil by described wire.
Preferably, described cantilever beam long slab is fixed on the geometric center position of its side, place.
Preferably, the length of described cantilever beam long slab is stated the length of cantilever beam short slab described in being greater than.
Preferably, the intrinsic frequency of described cantilever beam long slab is greater than the intrinsic of described cantilever beam short slabFrequency, the intrinsic frequency of described cantilever beam short slab approaches the frequency of described vibrational excitation.
Preferably, the intrinsic frequency of described cantilever beam long slab is medium-high frequency, described vibrational excitationFrequency is low frequency.
Preferably, described magnetic field generating member comprises two permanent-magnet blocks, described two blocks of permanent magneticIron block is individually fixed in the inner surface of end face and the inner surface of bottom surface of described energy harvester housing,And described two permanent-magnet blocks lay respectively at described multiturn coil directly over and under.
Preferably, described magnetic field generating member is formed by an above permanent-magnet block stack, instituteState the interior table that magnetic field generating member is fixed on the side relative with the side of fixing described cantilever beam long slabOn face, and the described magnetic field generating member position fixing with described cantilever beam long slab is corresponding.
Preferably, described multiturn coil is circle or rectangle.
The utility model provides a kind of low-frequency vibration electromagnetic energy collector, of the present utility modelElectromagnetic energy collector has been realized low-frequency vibration mode and has been transformed and approach wherein to medium-high frequency mode of oscillationThe eigentone of cantilever beam long slab is produced in conjunction with the multiturn coil cutting magnetic induction line of motion simultaneouslyThe raw signal of telecommunication, realizes low-frequency vibration electromagnetic energy and collects, and carry out the utmost point by the mode of collisionImprove greatly the low frequency energy of electromagnetic type cantilever beam structures and collected bandwidth.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art,To the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below,Apparently, the accompanying drawing in the following describes is only embodiment more of the present utility model, rightIn those of ordinary skill in the art, not paying under the prerequisite of creative work, all rightObtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the low-frequency vibration electromagnetic energy collector of a preferred embodiment of the present utility modelStructural representation;
Fig. 2 is the low-frequency vibration electromagnetic energy collector of a preferred embodiment of the present utility modelStereogram;
Fig. 3 is that the low-frequency vibration electromagnetic energy of another preferred embodiment of the present utility model is collectedThe structural representation of device;
Fig. 4 is that the low-frequency vibration electromagnetic energy of another preferred embodiment of the present utility model is collectedThe stereogram of device;
Fig. 5 A, 5B are the multiturn coil of low-frequency vibration electromagnetic energy collector of the present utility modelSchematic cross-section
Detailed description of the invention
Below in conjunction with drawings and Examples, the utility model is described in further detail. Following realityExecute example for the utility model is described, but can not be used for limiting scope of the present utility model.
A kind of low-frequency vibration electromagnetic energy collector, as shown in Figure 1, 2, described low-frequency vibration electricityMagnetic energy collector comprise energy harvester housing 1, cantilever beam long slab 2, cantilever beam short slab 10,Collision mass piece 9, magnetic field generating member 7 and 3 and multiturn coil 8. Described cantilever beam long slab 2One end be fixed on the inner surface of a side of described energy harvester housing 1, described cantilever beamThe other end of long slab 2 be fixed with described multiturn coil, preferably, multiturn coil is fixed on outstandingThe upper face of the other end of arm beam length plate 2; One end of described cantilever beam short slab 10 is fixed on fixingThe inner surface of the side of described cantilever beam long slab 2, described cantilever beam short slab 10 is positioned at described cantileverDirectly over beam length plate 2, arm beam short slab 10 is fixed on the side of fixing described cantilever beam long slab 2The position on the upper side, central area of face, and described cantilever beam short slab 10 and described cantilever beam long slab2 is parallel, and the lower face of the other end of described cantilever beam short slab 10 is fixed with described collision mass piece9, described cantilever beam long slab 2 preset distances of described collision mass piece 9 distance, preferably, described inPreset distance can regulate according to actual needs; Described magnetic field generating member 7 and 3 is fixed and instituteState the inner surface of energy harvester housing 1, and described multiturn coil 8 moves described in time cuttingThe magnetic induction line of magnetic field generating member, when multiturn coil 8 moves, permanent-magnet block 3,7 producesElectromagnetic field need to cut the geometry face in multiturn coil 8. Preferably, above-mentioned preset distanceFor slight distance.
Vibration environment provides vibrational excitation to described energy harvester housing 1, described cantilever beam short slab10 vibrate with described vibrational excitation, what now described cantilever beam long slab 2 may be with housing 1Vibration is vibrated simultaneously, also may can not make length of cantilever because housing 1 vibration frequency is too lowPlate 2 is along with shaking. Described collision mass piece 9 shakes along with the vibration of cantilever beam short slab 10Moving, thus the precalculated position of described cantilever beam long slab 2 is bumped, make described length of cantileverPlate 2 produces the vibration that approaches itself intrinsic frequency, is fixed on cantilever beam long slab 2 other endsDescribed multiturn coil 8 is with the frequency vibration identical with described cantilever beam long slab 2, and cutting magnetic field producesThe magnetic induction line that raw part 7,3 produces, the signal of telecommunication of generation, realizes the collection to low-frequency vibration energy.The signal of telecommunication producing can be stored, and can certainly directly receive on power device and use. Wherein,Above-mentioned precalculated position can be according to actual conditions, short by adjusting cantilever beam long slab 2 and cantilever beamThe length of plate 10 is adjusted.
Above-mentioned electromagnetic energy collector has been realized low-frequency vibration mode and has been transformed to medium-high frequency mode of oscillationApproach the wherein eigentone of cantilever beam long slab, cut in conjunction with the multiturn coil of motion simultaneouslyMagnetic induction line produces the signal of telecommunication, and realize low-frequency vibration electromagnetic energy and collect, and pass through to collideMode has greatly improved the low frequency energy of electromagnetic type cantilever beam structures and has collected bandwidth.
Further, described low-frequency vibration electromagnetic energy collector also comprises wire 4,6, described inWire 4,6 is connected with described multiturn coil 8, for the telecommunications that described multiturn coil 8 is producedNumber derive. Described low-frequency vibration electromagnetic energy collector also comprises load resistance 5, described load electricityResistance 5 is in parallel with described multiturn coil 8 by described wire 4,6, as shown in Figure 1. When not havingWhen Lorentz force coupled vibrations mode, the resistance of load resistance 5 is close to the electricity of multiturn coil 8When resistance, the average energy maximum of collection.
Further, described cantilever beam long slab 2 is arranged in but is not limited to the geometry of its side, placeHeart position. As long as the fixing position of cantilever beam long slab 2 can be well at cantilever beam short slab 10Effect issue occur vibration. Preferably, the length of described cantilever beam long slab 2 is greater than instituteState the length of cantilever beam short slab 10.
Further, the length and width of cantilever beam long slab 2 and thick size are formulated according to actual demand,When its size is less, the intrinsic frequency of cantilever beam long slab 2 is also just higher. Cantilever beam long slab 2Having object is to provide motion for multiturn coil 8. The length and width of cantilever beam short slab 10 and thick sizeNeed determine according to external environment frequency and the point of impingement, the object of cantilever beam short slab 10 is to be collisionMass 9 provides low-frequency oscillation. Cantilever beam long slab 2 needs to keep with the space of cantilever beam short slab 10Space parallel.
Further, the intrinsic frequency of described cantilever beam long slab 2 is greater than described cantilever beam short slab 10Intrinsic frequency, the intrinsic frequency of described cantilever beam short slab 10 approaches the frequency of described vibrational excitation.The intrinsic frequency of wherein said cantilever beam long slab is medium-high frequency, and the frequency of described vibrational excitation is lowFrequently. This design can make cantilever beam short slab 10 very easily open under the effect of vibrational excitationBegin to vibrate, and state collision mass piece in 10 drives of cantilever beam short slab cantilever beam long slab 2 is collidedSituation under, make cantilever beam long slab 2 that the vibration approximate with its intrinsic frequency easily occur. Above-mentionedMedium-high frequency is that frequency is frequency more than 100Hz, and low frequency is that frequency is the frequency between 50-60HzRate.
Further, as shown in Figure 1, described magnetic field generating member comprise two permanent-magnet blocks 7,3, described two permanent-magnet blocks are individually fixed in the interior table of the end face of described energy harvester housingThe inner surface of face and bottom surface, and described two permanent-magnet blocks 7,3 lay respectively at described multiturnDirectly over coil 8 and under. Permanent magnetic iron block 7 and permanent magnetic iron block 3 also can be positioned at housingOther places of inner surface, as long as cut permanent magnetic iron block 7 while ensureing multiturn coil motion and useThe magnetic induction line that magnet piece 3 produces. Preferably, the N utmost point and the permanent magnetic iron block of permanent magnetic iron block 73 S is extremely relative, is certainly not limited to this mode, and for example, the S utmost point of permanent magnetic iron block 7 is with foreverThe N of magnet piece 3 extremely relatively, the N utmost point of permanent magnetic iron block 7 and the N of permanent magnetic iron block 3 is extremely relative,The S utmost point of permanent magnetic iron block 7 is extremely relative with the S of permanent magnetic iron block 3. In multiturn coil 8 is excited to doWhen high frequency lengthwise movement, on multiturn coil 8, producing Lorentz force can be mutual with cantilever beam long slab 2Close coupling occurs, and the effect of its coupling reacts on multiturn coil 8 lengthwise movements.
Further, as shown in Fig. 5 A, 5B, the cross section of described multiturn coil is circle or squareShape, but be not limited to circle and rectangle.
When this low-frequency vibration electromagnetic energy collector is arranged in low-frequency vibration environment or is carried atWhen human body, the vibration of environment or human body is clashed into cantilever beam long slab 2 by collision mass piece 9, makes to hangThe free end of arm beam length plate 2 ceaselessly longitudinally does the vibration of medium-high frequency, thereby drives multiturn coil 8Also do identical medium-high frequency lengthwise movement, multiturn coil 8 is in the space magnetic of permanent magnet 3,7Among field distribution, therefore multiturn coil 8 produces transient state alternating current thereupon, transient state alternating currentOutput to immediately load resistance 5 and consume, thereby be embodied as various electronic devices or sensor providesElectric energy. Above-mentioned collector adopts electromagnetic type principle, utilizes cantilever beam to vibrate the collection of energy of carrying outStructure, easily obtains larger induced-current, and easy to make. In addition, above-described embodiment passes throughAssembly structure and Lorentz force intercouple, and effectively expand collection of energy frequency band, also simultaneouslyCan be by load resistance value and multiturn coil resistance value adjusting, realize maximum average energy and collect defeatedGo out, thereby increase substantially energy conversion efficiency.
Fig. 3 is that the low-frequency vibration electromagnetic energy of another preferred embodiment of the present utility model is collectedThe structural representation of device; Fig. 4 is the low-frequency vibration of another preferred embodiment of the present utility modelThe stereogram of electromagnetic energy collector. The described low-frequency vibration electromagnetic energy collector of the present embodimentComprise energy harvester housing 11, cantilever beam long slab 12, cantilever beam short slab 20, collision mass piece19, magnetic field generating member 13,14 and multiturn coil 18, wire 15,17 and load resistance16。
The low-frequency vibration electromagnetic energy collector of another embodiment as shown in Figure 3,4, produce in magnetic fieldRaw part is formed by 13,14 stacks of two permanent-magnet blocks, and described magnetic field generating member is fixed onOn the inner surface of the side relative with the side of fixing described cantilever beam long slab, preferably, described inThe magnetic field generating member position fixing with described cantilever beam long slab is corresponding. Permanent magnetic iron block 13 and permanent magnetismIron block 14 also can be positioned at other places of the inner surface of housing, as long as ensure multiturn coil 18The magnetic induction line that cuts permanent magnetic iron block 13 when motion and produce with magnet piece 14. Preferably,The N utmost point of permanent magnetic iron block 13 contacts with the S utmost point of permanent magnetic iron block 14, is certainly not limited to this sideFormula, for example, the S utmost point of permanent magnetic iron block 13 contacts with the N utmost point of permanent magnetic iron block 14, permanent magnetic iron block13 the N utmost point contacts with the N utmost point of permanent magnetic iron block 14, the S utmost point and the permanent magnetic iron block of permanent magnetic iron block 1314 S utmost point contact. In the time that multiturn coil 18 is excited to do medium-high frequency lengthwise movement, multiturn coilOn 18, can produce horizontal Lorentz force, not be coupled with cantilever beam long slab 12.
Other structures of the low-frequency vibration electromagnetic energy collector of this embodiment and a upper embodiment phaseWith, repeat no more here.
Electromagnetic energy collector of the present utility model, surrounding environment medium and low frequency generation of vibrationMechanical energy is converted into electric energy. Under low-frequency vibration excitation, the collision mass piece of low-frequency vibration can be withCantilever beam long slab ad-hoc location bumps, and the cantilever beam long slab after collision can produce medium-high frequency and shakeMoving, drive is fixed on the free-ended multiturn coil of cantilever beam long slab medium-high frequency also can occur thereuponVibration. Because multiturn coil is in the external electromagnetic field of permanent magnet generation, work as multiturn coilWhile there is cutting magnetic induction line motion, can in multiturn coil, produce transient state alternating current energy, canStore to export load resistance consumption or energy-storage units to. Electromagnetic energy of the present utility model is receivedStorage has been realized low-frequency vibration electromagnetic energy and has been collected, and does not need as condenser type energy harvesterPreliminary filling power supply is set separately, does not also need work complexity processed as piezoelectric type energy collector, realizeElectromagnetic energy collect passive, and manufacture craft simplify, simultaneously by collisionMode has greatly improved the low frequency energy of electromagnetic type cantilever beam structures and has collected bandwidth.
Collector of the present utility model can be used to various mobile electronic devices, wireless senserAnd the power supply such as wearable device, break away from battery powered limitation.
In above-mentioned two embodiment, for ensureing that cantilever beam long slab 2,12 has enough elastic deformations,Preferentially aluminium is as the material of cantilever beam long slab 2,12, if the less chi of micro-manufacture demandVery little, also can use silicon as cantilever beam long slab 2,12 materials. For ensure cantilever beam short slab 10,20 have enough elastic deformations, can preferentially select the material of brass as cantilever beam short slab 10,20,If micro-manufacture demand smaller szie, can use SU8 or benzocyclobutene etc. short as cantilever beamThe material of plate 10,20. Available copper is as the raw material of multiturn coil 8,18, multiturn coil 8,18 geometry can be made into circle or rectangle. Available copper is as collision mass piece 9,19Raw material, the lower end of collision mass piece 9,19 can keep enough with cantilever beam long slab 2,12Little distance, space length collection of energy measuring and calculating is according to demand determined. Select NdFeB foreverElectromagnet block 3,7,13,14 for a long time, the space length of upper and lower two electromagnet blocks 3,7 is protected as far as possibleHold zone of reasonableness; Or left side electromagnet block 13,14 and cantilever beam long slab 2,12 free end spacesDistance keeps zone of reasonableness as far as possible. Load resistance 5 is worth and should determines by measuring and calculating, and measuring method is complied withAccording to the average harvest energy of device, load resistance 16 values should approach with multiturn coil 18 resistance values.
Above embodiment is only for the utility model is described, but not to restriction of the present utility model.Although the utility model is had been described in detail with reference to embodiment, the ordinary skill people of this areaMember should be appreciated that the technical solution of the utility model is carried out various combinations, revises or is equal toReplace, do not depart from the spirit and scope of technical solutions of the utility model, all should be encompassed in this realityIn the middle of novel claim scope.
Claims (10)
1. a low-frequency vibration electromagnetic energy collector, is characterized in that, described low-frequency vibration electricityMagnetic energy collector comprises energy harvester housing, cantilever beam long slab, cantilever beam short slab, collisionMass, magnetic field generating member and multiturn coil;
One end of described cantilever beam long slab be fixed on described energy harvester housing a side inSurface, the other end of described cantilever beam long slab be fixed with described multiturn coil; Described cantilever beamThe inner surface of the side of fixing described cantilever beam long slab, described cantilever beam are fixed in one end of short slabShort slab be positioned at described cantilever beam long slab directly over, and described cantilever beam short slab and described cantileverBeam length plate is parallel, and the lower face of the other end of described cantilever beam short slab is fixed with described collision massPiece, the described cantilever beam long slab preset distance of described collision mass piece distance; Described magnetic field generating memberThe inner surface of fixing and described energy harvester housing, and cutting when the motion of described multiturn coilThe magnetic induction line that described magnetic field generating member produces;
Vibration environment provides vibrational excitation to described energy harvester housing, described cantilever beam short slabVibrate with described vibrational excitation, described collision mass piece is to described cantilever beam long slab simultaneouslyPrecalculated position bumps, and described cantilever beam long slab is produced approach shaking of itself intrinsic frequencyMoving, described multiturn coil, with the frequency vibration identical with described cantilever beam long slab, cuts described magneticSense line, the signal of telecommunication of generation.
2. low-frequency vibration electromagnetic energy collector according to claim 1, is characterized in that,Described low-frequency vibration electromagnetic energy collector also comprises wire, described wire and described multiturn coilConnect, derive for the signal of telecommunication that described multiturn coil is produced.
3. low-frequency vibration electromagnetic energy collector according to claim 2, is characterized in that,Described low-frequency vibration electromagnetic energy collector also comprises load resistance, and described load resistance passes through instituteState wire in parallel with described multiturn coil.
4. low-frequency vibration electromagnetic energy collector according to claim 1, is characterized in that,Described cantilever beam long slab is fixed on the geometric center position of its side, place.
5. low-frequency vibration electromagnetic energy collector according to claim 1, is characterized in that,Described in being greater than, the length of described cantilever beam long slab states the length of cantilever beam short slab.
6. low-frequency vibration electromagnetic energy collector according to claim 1, is characterized in that,The intrinsic frequency of described cantilever beam long slab is greater than the intrinsic frequency of described cantilever beam short slab, described outstandingThe intrinsic frequency of arm beam short slab approaches the frequency of described vibrational excitation.
7. low-frequency vibration electromagnetic energy collector according to claim 1, is characterized in that,The intrinsic frequency of described cantilever beam long slab is medium-high frequency, and the frequency of described vibrational excitation is low frequency.
8. low-frequency vibration electromagnetic energy collector according to claim 1, is characterized in that,Described magnetic field generating member comprises two permanent-magnet blocks, and described two permanent-magnet blocks are fixing respectivelyIn the inner surface of end face and the inner surface of bottom surface of described energy harvester housing, and described twoPiece permanent-magnet block lay respectively at described multiturn coil directly over and under.
9. low-frequency vibration electromagnetic energy collector according to claim 1, is characterized in that,Described magnetic field generating member is formed by an above permanent-magnet block stack, described magnetic field generating memberBe fixed on the inner surface of the side relative with the side of fixing described cantilever beam long slab, and instituteState the magnetic field generating member position fixing with described cantilever beam long slab corresponding.
10. low-frequency vibration electromagnetic energy collector according to claim 1, its feature existsIn, described multiturn coil is circle or rectangle.
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| CN201520956231.XU CN205249083U (en) | 2015-11-26 | 2015-11-26 | Low frequency vibration electromagnetic energy collector |
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| CN201520956231.XU CN205249083U (en) | 2015-11-26 | 2015-11-26 | Low frequency vibration electromagnetic energy collector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106803726A (en) * | 2015-11-26 | 2017-06-06 | 清华大学 | Low-frequency vibration electromagnetic energy collector |
| CN109495012A (en) * | 2018-10-18 | 2019-03-19 | 天津大学 | The bistable piezoelectric type cantilever beam vibration energy collector of additional elastic ball |
| CN109829225A (en) * | 2019-01-25 | 2019-05-31 | 上海理工大学 | The method for improving of mechanical structure eigentone |
| CN111121099A (en) * | 2020-01-04 | 2020-05-08 | 肖克 | Gas stove capable of automatically cutting off heating source |
-
2015
- 2015-11-26 CN CN201520956231.XU patent/CN205249083U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106803726A (en) * | 2015-11-26 | 2017-06-06 | 清华大学 | Low-frequency vibration electromagnetic energy collector |
| CN106803726B (en) * | 2015-11-26 | 2019-05-10 | 清华大学 | Low-frequency vibration electromagnetic energy collector |
| CN109495012A (en) * | 2018-10-18 | 2019-03-19 | 天津大学 | The bistable piezoelectric type cantilever beam vibration energy collector of additional elastic ball |
| CN109829225A (en) * | 2019-01-25 | 2019-05-31 | 上海理工大学 | The method for improving of mechanical structure eigentone |
| CN111121099A (en) * | 2020-01-04 | 2020-05-08 | 肖克 | Gas stove capable of automatically cutting off heating source |
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