CN108110797A - A kind of pipeline hydraulic turbine power generation micro power network - Google Patents
A kind of pipeline hydraulic turbine power generation micro power network Download PDFInfo
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- CN108110797A CN108110797A CN201810135181.7A CN201810135181A CN108110797A CN 108110797 A CN108110797 A CN 108110797A CN 201810135181 A CN201810135181 A CN 201810135181A CN 108110797 A CN108110797 A CN 108110797A
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- hydraulic turbine
- energy storage
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- 238000010248 power generation Methods 0.000 title description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 238000004146 energy storage Methods 0.000 claims abstract description 31
- 230000005611 electricity Effects 0.000 claims abstract description 29
- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000001914 filtration Methods 0.000 claims description 10
- 230000006855 networking Effects 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000005389 magnetism Effects 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 239000000306 component Substances 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 239000010926 waste battery Substances 0.000 description 1
- 238000004260 weight control Methods 0.000 description 1
Classifications
-
- H02J3/382—
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
Abstract
The invention discloses a kind of pipeline hydraulic turbine generate electricity micro power network, including：N number of water meter, the pipeline of each water meter connect a pipeline hydrogenerator, and more than pipeline hydrogenerator is connected again with a power management and energy storage device jointly, and the power management and energy storage device include：Control circuit and the accumulator being connected with control circuit are generated electricity by the corresponding pipeline hydrogenerator of the originally water-driven of water meter, and the electric energy of generation enters the power management and energy storage device, and charges to the accumulator, and stores electric energy；Wherein, the accumulator is connected to data of water meter acquisition module and Lora node modules, and thus provides the electric power that both is operated.
Description
Technical field
The invention belongs to the pipeline hydraulic turbine power generation micro power networks of a kind of micro power network, especially a kind of technical grade.
Background technology
Water kinetic energy generation technology:The technology to be generated electricity using flowing water.
Family generator：Every individual generator of family.
Generating efficiency：The kinetic energy of water is transformed into the ratio of final electric energy.
Minimum water flow：The current that generator can just rotate.
Maximum pressure drop is lost：The variation of current hydraulic pressure after generator in order to ensure that do not influence user is tested with water body, needs
Control maximum.
Micro power network：The electric power system being made of several generator connecting in parallel with system；
LoRa：Long Range, i.e., it is remote；
Water meter inner cavity is narrow and small, the installation environment of water meter is severe, takes electric difficulty, when using wirelessly transmitting data, is dependent on
In on-board batteries.When not forming in unit operation or city size operation, hiding hidden danger does not display.
But a city, the user of water meter wireless kilowatt meter reading-out system is more than 250,000 user groups, according to the previous nothing of mesh
The battery of line water meter node calculates over 8 years, 25 general-purpose families, and the discarded lithium battery at 30,000 families is generated per annual meeting, will be sent out
Buying expenses 750,000 yuan or more raw and the daily huge workload for needing replacing 125 batteries.
In addition annual 30000 waste batteries recycling be also a very intractable thing, if portion conscientiously recycle this 30,000
To its battery, environment will be caused huge harm.Medium above city is because using consequence caused by on-board batteries undoubtedly
It is more serious.
The content of the invention
Water flow dynamic energy power generation based on the pipeline using user's daily water consumption can solve to solve data of water meter acquisition power supply
Certainly long-range water meter reading powerup issue.
It is as follows that the present invention solves the technical solution that above-mentioned technical problem is taken：
A kind of pipeline hydraulic turbine power generation micro power network, including：N number of water meter, each water meter connect a pipeline hydraulic generator
Machine, more than pipeline hydrogenerator is connected again with a power management and energy storage device jointly, and then this N number of pipeline hydraulic generator
Machine common networking forms a micro power network, for providing electric power for water meter reading；Wherein, the power management and energy storage device bag
It includes：Control circuit and the accumulator being connected with control circuit pass through the corresponding pipeline hydraulic generator of the originally water-driven of water meter
Machine generates electricity, and the electric energy of generation enters the power management and energy storage device, and charges to the accumulator, and stores electric energy；
Wherein, the accumulator is connected to data of water meter acquisition module and LoRa node modules, and thus provides both and transported
The electric power turned.
Preferably, also with wireless module and LoRa node modules, the LoRa node modules connection antenna mould
Block, and link together with water meter, pipeline hydrogenerator and power management and energy storage device.
Preferably, 6 to 8 road pipeline minitype wheel generators star-like networking in parallel.
Preferably, the power management and energy storage device receive the electric energy of each pipeline hydrogenerator, and to not work
The valve control switch and remote meter reading module for the water meter that the pipeline hydrogenerator of work is connected are powered.
Preferably, control circuit is additionally provided with, wherein, each pipeline hydrogenerator connects a control electricity
Road, wherein, the control circuit includes：Current rectifying and wave filtering circuit and step-up/step-down circuit, also, the friendship of pipeline hydrogenerator output
Stream energy is after the current rectifying and wave filtering circuit carries out rectifying and wave-filtering, and when voltage is higher than 1V, the control circuit starts lifting
Volt circuit, entire circuit not power consumption when not generating electricity, while can according to the on-off times of the high high adjustment step-up/step-down circuit of voltage,
Dynamic take the control of energy size, and it is grid-connected finally to export the progress of 4.5V burning voltages.
Preferably, the pipeline hydrogenerator is extracted generator energy in the form of constant-current source and energy storage battery is carried out
Floating charge accumulation of energy, and the power management and energy storage device can export stable voltage to loading effectively management.
Preferably, on the one hand the power management and energy storage device ensure not causing with pipeline water flow change in flow miniature
On the other hand damage of the hydrogenerator to energy storage device also ensures its load constant pressure output.
Preferably, the pipeline hydrogenerator includes shell, hydraulic turbine part and electric energy transform portion, the water
Engine Department point is arranged in water wheels casing, and the Component of Hydraulic Turbines and power conversion components are connected with each other；In water wheels casing
One impeller is set, and impeller drives permanent magnetism to produce electricl energy by axis, and strong permanent magnetic iron is arranged in skeleton, and skeleton drive end bearing bracket connects with lower cover
It connects；Inlet and outlet are set on water wheels casing, and the water of the formation axis stream of inlet and outlet can drive turbine rotor to send out
Electricity.
After said program, realized and generated electricity based on current, and it is remote to meet water meter to supply energy storage device
Journey meter reading energy management work, the structure of the minitype wheel generator is simple, and stability is good, long working life.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that being understood by implementing the present invention.The purpose of the present invention and other advantages can be by the explanations write
Specifically noted structure is realized and obtained in book, claims and attached drawing.
Description of the drawings
The present invention is described in detail below in conjunction with the accompanying drawings, so that the above-mentioned advantage of the present invention is definitely.Its
In,
Fig. 1 is the electricity generating principle schematic diagram of pipeline hydrogenerator in the prior art；
Fig. 2 is the electricity generating principle schematic diagram of pipeline hydrogenerator in the prior art；
Fig. 3 is the structure diagram of inventive pipeline hydraulic turbine power generation micro power network；
Fig. 4 is the schematic diagram of control circuit in inventive pipeline hydraulic turbine power generation micro power network.
Fig. 5 is the structure diagram of inventive pipeline hydraulic turbine power generation micro power network；
Fig. 6 is the structure diagram of the device of wireless long-distance meter-reading；
Fig. 7 is the structure diagram of pipeline hydrogenerator in the present invention；
Fig. 8 is the structure diagram of pipeline hydrogenerator in the present invention.
Specific embodiment
Carry out the embodiment that the present invention will be described in detail below with reference to accompanying drawings and embodiments, how the present invention is applied whereby
Technological means solves technical problem, and the realization process for reaching technique effect can fully understand and implement according to this.It needs to illustrate
As long as not forming conflict, each embodiment in the present invention and each feature in each embodiment can be combined with each other,
The technical solution formed is within protection scope of the present invention.
As shown in 1-8, the minitype wheel generator structure that this patent is related to includes shell, hydraulic turbine part and electric energy conversion
Part, the hydraulic turbine part are arranged in water wheels casing, and the Component of Hydraulic Turbines and power conversion components are connected with each other；
One impeller is set in water wheels casing, and impeller drives permanent magnetism to produce electricl energy by axis, and strong permanent magnetic iron is arranged in skeleton, before skeleton
End cap is connected with lower cover；Inlet and outlet are set on water wheels casing, and the water of the formation axis stream of inlet and outlet can drive
Dynamic turbine rotor power generation.
Specifically, hydraulic turbine protecgulum（1）, permanent magnetism coil（2）, strong permanent magnetic magnet（3）, water inlet（4）, hydraulic turbine leaf
Wheel（5）, hydraulic turbine connecting shaft（6）, electric energy conversion portion（7）, Component of Hydraulic Turbines（8）, hydraulic turbine rear cover（9）, water outlet（10）、
Water wheels casing（11）, wherein, electric energy converting member can take general component, be not described in detail herein.
In the case that its this patent is based on smaller current, sufficiently large electric current can be generated, supplies energy storage device
To meet water meter remote meter reading energy management work, the structure of the minitype wheel generator is simple, and stability is good, long working life.
Wherein, according to such as Fig. 1 and Fig. 2, it can be found that following rule：
1st, when wireless watermeter meter reading user reaches city size, the technical solution of on-board batteries is infeasible；
2nd, for safety standard and the considerations of take electric cost, it is also infeasible to take electricity from industrial electrical network；
3rd, user will necessarily generate water kinetic energy with water；
The water kinetic energy power generation generated when the 4th, using water flowing is to set up in principle；
5 but user is lack of standardization with the water time, utilization rate（With water time cumulation/24 it is small when）× 100% generally 12.5%；
6th, more user's water kinetic energy generator combination one micro power networks of ingredient can efficiently use electric energy, storage electric energy, distribution
Electric energy.
For this purpose,+one wireless receiving and dispatching terminal of electricity generation system+micro power network scheduling system the present invention is based on a multi-user
+ apparatus for storing electrical energy（Rechargeable lithium battary）It is the main composition of the present invention；
Thus micro power network technology caused by invention, the water kinetic energy power generation that user can be made full use of to be generated when with water are micro-
Electric energy disperse, desultory is carried out unified allotment by type power grid so that power generation and electricity consumption are effectively allocated.
1st, existing water meter Wireless Meter Reading Technology increases system cost using on-board batteries；
2nd, the technical solution for the on-board batteries that existing water meter radio meter register uses is not renewable；
3rd, the kinetic energy of the water proposed by the present invention necessarily led to using city and water users when with water is a kind of necessarily to close
System；
4th, micro power network by caused by the water kinetic energy generator of single household electric energy carry out unified allocation of resources, by more than electric energy deposit
Storage is got up；
5th, the technology of institute's coefficient of the present invention can abandon the technical solution of on-board batteries, it is possible to prevente effectively from foregoing disadvantage；
It is as follows that the application motion provides technical solution：
A kind of pipeline hydraulic turbine power generation micro power network, which is characterized in that including：N number of water meter, each water meter connect a pipe
Road hydrogenerator, more than pipeline hydrogenerator is connected again with a power management and energy storage device jointly, and then this N number of pipe
Road hydrogenerator common networking forms a micro power network, for providing electric power for water meter reading；Wherein, the power management and
Energy storage device includes：Control circuit and the accumulator being connected with control circuit are managed accordingly by the originally water-driven of water meter
Road hydrogenerator power generation, the electric energy of generation enters the power management and energy storage device, and charges to the accumulator, and
Store electric energy；Wherein, the accumulator is connected to data of water meter acquisition module and water meter working condition drive module, and thus
The electric power that both is operated is provided.Preferably, N selects 6-8.
Wherein, which is the water supply pipe Miniature flow generator of technical grade.In addition, using 6-
8 progress networkings can ensure the availability of power generation；Also, the system can avoid water meter reading as radio meter register application
The green application of disposable battery power supply.
Preferably, also with wireless module and LoRa node modules, the LoRa node modules connection wireless mould
Block, and link together with water meter, pipeline hydrogenerator and power management and energy storage device.Wherein, LoRa node modules energy
It enough realizes low-power wireless transmission LoRaWAN technologies, there is good technique effect.
Preferably, 6 to 8 road pipeline minitype wheel generators star-like networking in parallel.
Preferably, the power management and energy storage device read the electric energy of each pipeline hydrogenerator, and to not work
The valve control switch and remote meter reading module for the water meter that the pipeline hydrogenerator of work is connected are powered.
Preferably, control circuit is additionally provided with, wherein, each pipeline hydrogenerator connects a control electricity
Road, wherein, the control circuit includes：Current rectifying and wave filtering circuit and step-up/step-down circuit, also, the friendship of pipeline hydrogenerator output
Stream energy is after the current rectifying and wave filtering circuit carries out rectifying and wave-filtering, and when voltage is higher than 1V, the control circuit starts lifting
Volt circuit, entire circuit not power consumption when not generating electricity, while can according to the on-off times of the high high adjustment step-up/step-down circuit of voltage,
Dynamic take the control of energy size, and it is grid-connected finally to export the progress of 4.5V burning voltages.
Wherein, micro power network power supply scheduling principle：
Generally by the star-like networking in parallel of 6 to 8 road pipeline minitype wheel generators.
The water flow pressure driving minitype wheel generator power generation based on user's daily water consumption per road minitype wheel generator.By
In the randomness of user's water, multichannel micro hydraulic turbine power generation possibility significantly increases, that is, the user having may not have to water, then should
Branch minitype wheel generator does not work, and separately has user's water simultaneously, then corresponds to the power generation of branch minitype wheel generator, ensure
The generating power by water current energy efficiently uses.I.e. by the random power generation of 6-8 roads minitype wheel generator, to provide supply 6-8 roads water meter
Valve control switch and remote meter reading module electric energy, avoid user for a long time do not have to water and cause the road water meter valve control and remote meter reading
Lack electric energy, this is exactly that so-called realization micro power network is effectively dispatched.Micro power network scheduling system possesses Width funtion input constant pressure
The characteristics of output
Wherein, each hydrogenerator connects more than one circuit, and AC energy is after rectifying and wave-filtering, when voltage is higher than 1V,
Startup step-up/step-down circuit, entire circuit not power consumption when not generating electricity, while can be according to the high high adjustment step-up/step-down circuit of voltage
On-off times, dynamically carry out taking the control of energy size, and it is grid-connected finally to export the progress of 4.5V burning voltages.
Micro power network power management function：
Multiple-way duct minitype wheel generator parallel connection networking exports electric energy, is extracted into electric power management circuit in the form of constant-current source
Generator energy charges to energy storage battery, and electric power management circuit strengthen to load effectively management can export it is stable
Voltage.
On the one hand electric power management circuit ensures with pipeline water flow change in flow minitype wheel generator not to be caused to fill energy storage
On the other hand the damage put also ensures its load constant pressure output.
The core component of micro power network is minitype wheel generator, efficient that water kinetic energy is converted into electric energy, and not
Being tested with water body for user is influenced, then multiple way electric carries out load weight control by electric power management circuit（It can influence hydraulic pressure
Difference）And buck (it is all available to guarantee generated energy), last energy storage use in battery for outside.
LoRa node modules are to the transmission channel of low-consumption wireless remote meter reading, using the competitive long distance of industry
From technology of Internet of things, modulated based on linear frequency modulation spread spectrum, it is maintained as the identical low power consumption characteristic of FSK modulation, but significantly
Add communication distance.LoRaWAN™ Module（Hereinafter referred to as LWM）Low-consumption wireless control module is a highly integrated, is mainly adopted
With the long-range modulation-demodulation technique of LoRa patents, compared with similar device, electric current is being greatly reduced in the radio frequency solution that LWM is used
On the basis of consumption, phase noise, selectivity, the receiver linearity, three ranks input intercept point are also significantly optimized（IIP3）Deng
Properties.Low-power consumption MCU built in LWM for extra long distance spread spectrum communication, is reducing the same of current drain to greatest extent
When, and anti-interference and sensitivity greatly improved.In addition, LoRa modules are highly sensitive to make these with the integrated of power amplifier
The link budget of device has reached industry-leading level, becomes remote transmission and the high product of reliability requirement, supports WM-
The international standards such as Bus and IEEE802.15.4g.It has the following characteristics that：
It is anti-interference strong：It is one of spread spectrum communication key property, because signal reception needs spread spectrum coding to carry out coherently despreading processing
It can obtain, so even if being disturbed with same type signal, interference does not work yet；
Good concealment：Because signal is expanded over a wide frequency band, power spectrum density is extremely low, is not only difficult to be sent out
It is existing, it seldom forms and disturbs for other communication equipments；
Communication distance is long：LoRa technology series product works in the limitation of the U.S., European Union, China and Japanese set by regulatory authorities
When, the data transmission distance in suburb can be promoted to more than 15 kilometers (9 miles), the data transmission distance in urban compact region carries
2-5 kilometers (3 miles) are risen to, the demand that centering continues device can be significantly reduced.
This programme can be connected, Neng Gouti by multiple generator connecting in parallel with system together by power-supply management system with accumulator
For reliable electric energy.
Finally it should be noted that：The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention,
Although the present invention is described in detail with reference to the foregoing embodiments, for those skilled in the art, still may be used
To modify to the technical solution recorded in foregoing embodiments or carry out equivalent substitution to which part technical characteristic.
Within the spirit and principles of the invention, any modifications, equivalent replacements and improvements are made should be included in the present invention's
Within protection domain.
Claims (8)
- The micro power network 1. a kind of pipeline hydraulic turbine generates electricity, which is characterized in that including：N number of water meter, the pipeline of each water meter connect A pipeline hydrogenerator is connect, more than pipeline hydrogenerator is connected again with a power management and energy storage device jointly, N number of Pipeline hydrogenerator common networking forms a micro power network, for providing electric power for water meter reading；Wherein, the power management And energy storage device includes：Control circuit and the accumulator being connected with control circuit, it is corresponding by the originally water-driven of water meter Pipeline hydrogenerator generates electricity, and the electric energy of generation enters the power management and energy storage device, and charges to the accumulator, And store electric energy；Wherein, the accumulator is connected to data of water meter acquisition module and Lora node modules, and thus provides it The electric power that the two is operated.
- The micro power network 2. the pipeline hydraulic turbine according to claim 1 generates electricity, which is characterized in that also with Anneta module and LoRa node modules, the LoRa node modules connect the Anneta module, and with water meter, pipeline hydrogenerator and power supply pipe Reason and energy storage device link together.
- The micro power network 3. the pipeline hydraulic turbine according to claim 1 or 2 generates electricity, which is characterized in that 6 to 8 road pipelines are miniature Hydrogenerator star-like networking in parallel.
- The micro power network 4. the pipeline hydraulic turbine according to claim 1 generates electricity, which is characterized in that the power management and energy storage Device receives the electric energy of each pipeline hydrogenerator, and the valve control for the water meter being connected to idle pipeline hydrogenerator Switch and remote meter reading module are powered.
- The micro power network 5. the pipeline hydraulic turbine according to claim 1 generates electricity, which is characterized in that control circuit is additionally provided with, Wherein, each pipeline hydrogenerator connects a control circuit, wherein, the control circuit includes：Rectifying and wave-filtering electricity Road and step-up/step-down circuit, also, the AC energy of pipeline hydrogenerator output carries out rectification by the current rectifying and wave filtering circuit After filtering, when voltage is higher than 1V, the control circuit startup step-up/step-down circuit, entire circuit not power consumption when not generating electricity, simultaneously It, according to the on-off times of the high high adjustment step-up/step-down circuit of voltage, dynamically can carry out taking the control of energy size, finally export 4.5V burning voltages carry out grid-connected.
- The micro power network 6. the pipeline hydraulic turbine according to claim 1 generates electricity, which is characterized in that the pipeline hydrogenerator Generator energy is extracted in the form of constant-current source to charge to energy storage battery, and the power management and energy storage device, to negative Stable voltage can be exported by being loaded with effect management.
- The micro power network 7. the pipeline hydraulic turbine according to claim 1 generates electricity, which is characterized in that the power management and energy storage On the one hand guarantee does not cause damage of the minitype wheel generator to energy storage device to device with pipeline water flow change in flow, on the other hand Also constant pressure output is ensured its load.
- The micro power network 8. the pipeline hydraulic turbine according to claim 1 generates electricity, which is characterized in that the pipeline hydrogenerator Including shell, hydraulic turbine part and electric energy transform portion, the hydraulic turbine part is arranged in water wheels casing, the water wheels Machine component and power conversion components are connected with each other；One impeller is set in water wheels casing, and impeller drives permanent magnetism to generate electricity by axis Can, strong permanent magnetic iron is arranged in skeleton, and skeleton drive end bearing bracket is connected with lower cover；Inlet and outlet are set on water wheels casing, into The water of the formation axis stream of the mouth of a river and water outlet can drive turbine rotor to generate electricity.
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| CN201810135181.7A CN108110797A (en) | 2018-02-09 | 2018-02-09 | A kind of pipeline hydraulic turbine power generation micro power network |
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| CN201810135181.7A CN108110797A (en) | 2018-02-09 | 2018-02-09 | A kind of pipeline hydraulic turbine power generation micro power network |
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|---|---|---|---|---|
| JP2005164319A (en) * | 2003-12-01 | 2005-06-23 | Systec:Kk | Self-generating power source for city water meter checking device and automatic city water meter checking system |
| CN103346588A (en) * | 2013-07-12 | 2013-10-09 | 浙江科技学院 | Tap water flow grid-combining electricity generating device |
| US20150260151A1 (en) * | 2014-03-17 | 2015-09-17 | Lsis Co., Ltd. | System for controlling water turbine generator for waterworks |
| CN106703125A (en) * | 2015-11-16 | 2017-05-24 | 宁波市润桥工业设计有限公司 | Energy saving system for building |
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Application publication date: 20180601 |