CN101509473A - Closed type hydraulic transmission for heliostat of solar thermal power generation system - Google Patents
Closed type hydraulic transmission for heliostat of solar thermal power generation system Download PDFInfo
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- CN101509473A CN101509473A CNA2009100715893A CN200910071589A CN101509473A CN 101509473 A CN101509473 A CN 101509473A CN A2009100715893 A CNA2009100715893 A CN A2009100715893A CN 200910071589 A CN200910071589 A CN 200910071589A CN 101509473 A CN101509473 A CN 101509473A
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- heliostat
- oil tank
- pressure oil
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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Abstract
A closed hydraulic driving device of a heliostat for solar heat generating system relates to a hydraulic driving device. The invention solves the problems of big mounting space, low efficiency and bad control reliability existing in the existing hydraulic driving device of a heliostat. In the invention, an alternating-current servo motor or variable-frequency motor is connected with a bidirectional constant rate pump, the bidirectional constant rate pump and a rotary hydraulic motor constitute a closed loop, the drainage port of the bidirectional constant rate pump is communicated with a closed pressure oil tank, a precompressed air cleaner is communicated with the closed pressure oil tank, a slippage pump assembly is connected on the closed loop in parallel and is communicated with the closed pressure oil tank, and a bidirectional hydraulic lock assembly is serially connected on the closed loop. The device has the advantages of simple transmission and driving form, good reliability, high transmission efficiency, energy utilization, good energy saving effect, long service life, and low manufacturing and maintenance cost. The transmission device and driving device in modular integrated design are particularly applied to large-scale and massive heliostats.
Description
Technical field
The present invention relates to a kind of hydraulic transmission that is used for solar heat power generation system, be specifically related to the Closed Hydraulic transmission device on a kind of heliostat that is used for tower-type solar thermal power generating system.
Background technique
Tower-type solar thermal power generating system also claims the concentrated solar heat power generation system, its citation form is the heliostat group who utilizes the independently tracked sun, with solar ray collecting to the receiver that is fixed on top of tower, in order to produce high temperature, heating working medium produces superheated vapor or high-temperature gas, the generating of driving steam turbine generator set or Gas Turbine Generating Units, thus be electric energy with solar energy converting.Studies show that aspect extensive generating, tower type solar energy thermal power generation will be the minimum a kind of mode of cost in all solar energy generation technologies.Heliostat is a kind of optical block of being made up of minute surface (reflector), mirror holder (supporting structure), tracking drive device and control system thereof etc., being used to follow the tracks of receive and assemble sunlight reflection entering the heat collector that is positioned at the reception top of tower, is the important component part at tower type solar energy thermal power generation station.Tracking drive device and control system thereof are the important device that guarantees heliostat motion and location, and its performance determines the working efficiency of heliostat, and then influence the generating efficiency of whole tower-type solar thermal power generating system.Therefore, the transmission device of heliostat and control system thereof are the key components of tower-type solar thermal power generating system.
The heliostat of main flow all adopts double-axis tracking control now, and azimuth axis and elevation axis respectively have a cover transmission device.Present effect control system preferably is an open-close ring mixed-control mode, its tracking and positioning: when sun incident light produces biased error above admissible value, supervisory control comuter calculates incident sunlight azimythal angle according to sun moving law and heliostat longitude and latitude etc., and (controller can be DSP to be sent to the track and localization controller, PLC or single-chip microcomputer), encoder obtains real-time orientation and the angle value of heliostat to the track and localization controller on the heliostat by being installed in simultaneously, calculate the angle of heliostat in azimythal angle and the rotation of elevation angle direction, the controlling and driving motor is according to direction and the rotated position set, reach the precalculated position, realize open loop control.The closed loop tracking transducer is accurately located near heliostat open loop control precalculated position, realizes the closed loop tracking.After the biased error of solar incident ray was eliminated, controller controlling and driving motor stopped operating, and finishes a control cycle.When sun incident light biased error generation next time, repeat above control procedure.This control mode neither cumulative error can occur in conjunction with the advantage of open and close ring control, also can not cause the inefficacy of tracking system because of overcast and rainy cloudy weather, is a kind of tracking accuracy height, the control system that reaction velocity is fast.
In the transmission device and control system thereof of heliostat, its transmission device is an important ring, because heliostat need reflex to sunlight the receiver apart from 60 meters on ground even higher top of tower, the minor variations of heliostat position all can cause reflected light bigger deviation on receiver, so existing heliostat great majority adopt no gap gear reducer, hydraulic transmission or both combinations.The shortcoming of the kind of drive of gear reducer is that the Gear Processing required precision of no gap is very high, the manufacture cost height, transmission efficiency is low, velocity ratio is fixed, can't adapt to all weather operations, complex structure is huge when exporting load greatly, and gear has a strong impact on track positioning accuracy after wearing and tearing easily and wearing and tearing, the maintenance cost height, so all adopt hydraulic transmission in the heliostat transmission of large size and big quality.The advantage of hydraulic transmission is to exert oneself greatly, but existing heliostat hydraulic transmission comprises oil pump, oil cylinder, control valve and various pipeline, and the space that system needs is also very big; Oil hydraulic circuit is an open type, and fluid is contaminated easily under rugged environment such as desert, and various control valve and relevant electrical equipment are more, and the probability that breaks down is just big, needs regular examination and maintenance, increases maintenance cost; And adopt the Hydraulic Power Transmission System efficient of valve control principle lower, and peak efficiency is about 70%, and this has also restricted the popularization of heliostat hydraulic transmission.
Summary of the invention
Installing space is big, efficient is low, the problem of control reliability difference for the hydraulic transmission that solves existing heliostat exists in the present invention, and then the Closed Hydraulic transmission device on a kind of heliostat that is used for solar heat power generation system is provided.
The present invention is that the technological scheme that solves the problems of the technologies described above employing is: the Closed Hydraulic transmission device on the heliostat that is used for solar heat power generation system of the present invention comprises AC servo motor or variable-frequency motor, two-way metering pump, the prepressing type air-strainer, the seal-off pressure oil tank, the Fill valve assembly, bidirectional hydraulic lock assembly and rotary actuator, described AC servo motor or variable-frequency motor are connected with two-way metering pump, constitute closed circuit between two-way metering pump and the rotary actuator, the drain tap of two-way metering pump is communicated with the seal-off pressure oil tank, the prepressing type air-strainer is communicated with the seal-off pressure oil tank, the Fill valve assembly is connected in parallel on the closed circuit and with the seal-off pressure oil tank and is communicated with, and the bidirectional hydraulic lock assembly is connected on the closed circuit.
The invention has the beneficial effects as follows: the present invention have simple in structure, control is reliable, in light weight, installation volume is little, the transmission efficiency advantages of higher.Use of the present invention can make the heliostat of solar heat power generation system have tracking accuracy height, low cost of manufacture, advantage that energy utilization rate is high.This device adopts the integrated design of modularization, there are not pumping plant and long pipeline, installation volume is little, do not have electromagnetism (electric liquid) valve in the device, do not have overflow and restriction loss, so reliability improves, control also simpler, be that a kind of transmission efficiency height, output loading are big, long service life is safeguarded heliostat hydraulic transmission simply and easily.Concrete advantage of the present invention mainly shows the following aspects: transmission device is by the turning to of control AC servo motor (or variable-frequency motor) 1, rotating speed and control direction, speed and the displacement of rotary actuator 9 running time, removed electric liquid (electromagnetism) valve of the easy clamping stagnation of spool, reduce the control unit number, simplified hydraulic control circuit, the enhanced system reliability.Among the present invention, the rotating speed of AC servo motor (or variable-frequency motor) 1 can change according to the change (as the size of wind-force) of environment, but and stepless speed regulation, rather than always be operated on the fixed rotating speed.Be characterized in when open loop is controlled, can moving, when abominable strong wind weather and closed loop are accurately located, then adopt lower rotating speed, the safety of protection heliostat and improve track positioning accuracy with fast speeds.Removed relief valve and throttle valve, avoided spill losses and restriction loss, transmission efficiency and energy utilization rate are higher than conventional hydraulic transmission device, efficient energy-saving.The present invention adopts the hydraulic closed loop, it is very little that oil storage tank can be done, and oil tank can make the seal-off pressure formula, whole like this hydraulic system sealing very good, (in the big desert of dust storm, this also is one of main addressing of solar power station) also can work well in rugged environment.When rotary actuator 9 reaches specified position and when stopping, AC servo motor (or variable-frequency motor) 1 also can shut down, up to sending of track and localization instruction next time, this has also saved the energy.At this moment, the position of rotary actuator 9 keeps by bidirectional hydraulic lock assembly 6, has saved mechanical locking device.The present invention adopts closed type hydraulic system, the fuel tank volume is very little, drive motor, oil tank and integrated valve block directly are connected with rotary actuator, and no external hydraulic pipe line makes that the volume of transmission device and drive unit is littler, and realization modular design, azimythal angle and elevation angle all can adopt this transmission device and drive unit when adjusting, and interchangeability is good, and this device can integral installation, break down and also can wholely replace, safeguard simple and fast.
Description of drawings
Fig. 1 is a principle schematic of the present invention.
Embodiment
Embodiment one: as shown in Figure 1, the Closed Hydraulic transmission device that present embodiment is described to be used on the heliostat of solar heat power generation system comprises AC servo motor or variable-frequency motor 1, two-way metering pump 2, prepressing type air-strainer 3, seal-off pressure oil tank 4, Fill valve assembly 5, bidirectional hydraulic lock assembly 6 and rotary actuator 9, described AC servo motor or variable-frequency motor 1 are connected with two-way metering pump 2 by coupling, constitute closed circuit 20 between two-way metering pump 2 and the rotary actuator 9, the drain tap of two-way metering pump 2 is communicated with seal-off pressure oil tank 4, prepressing type air-strainer 3 is communicated with seal-off pressure oil tank 4 by oil pipe, Fill valve assembly 5 is connected in parallel on the closed circuit 20 and by oil pipe and is communicated with seal-off pressure oil tank 4, and bidirectional hydraulic lock assembly 6 is connected on the closed circuit 20.Bidirectional hydraulic lock assembly 6 is connected in the closed circuit, can realize the two-way transmission of transmission and drive unit, again can be when transmission device quits work the confining liquid hydraulic circuit, locking rotary actuator 9.The unpowered recharging oil device that seal-off pressure oil tank 4, Fill valve assembly 5 and prepressing type air-strainer 3 are formed.AC servo motor (or variable-frequency motor) 1 can be arranged on the valve piece according to actual conditions with two-way metering pump 2, also can be arranged on the rotary actuator 9.
Embodiment two: as shown in Figure 1, the described prepressing type air-strainer 3 of present embodiment is made up of air filter 3-1, breather check valve 3-2 and exhaust check valve 3-3, described breather check valve 3-2 and exhaust check valve 3-3 are by oil pipe formation in parallel loop 3-4, air filter 3-1 is connected in series with the end of loop 3-4, and the other end of loop 3-4 is communicated with seal-off pressure oil tank 4.Prepressing type air-strainer 3 is installed on seal-off pressure oil tank 4, can be guaranteed that the seal-off pressure oil tank has certain positive pressure.Other composition and annexation are identical with embodiment one.
Embodiment three: as shown in Figure 1, the described Fill valve assembly 5 of present embodiment is made of two plug-in type Pilot operated check valve 5-1 butt joints.The Fill valve assembly 5 that is made of two plug-in type Pilot operated check valve 5-1 serial connections is connected in parallel in the closed circuit, the inlet port that can guarantee metering pump reliably communicates with hydraulic oil in (small-sized) seal-off pressure oil tank 4, the leakage of compensate for bidirectional metering pump 2 and rotary actuator 9, pressure in the assurance low pressure pipeline (oil pipe) is pressed greater than air separation, prevents that cavitation and air from infiltrating.Other composition and annexation are identical with embodiment one or two.
Embodiment four: as shown in Figure 1, the described bidirectional hydraulic lock assembly 6 of present embodiment is made up of two Pilot operated check valve 6-1, and two Pilot operated check valve 6-1 symmetries are connected on the closed circuit 20.Other composition and annexation are identical with embodiment three.
Embodiment five: as shown in Figure 1, described transmission device of present embodiment and drive unit also comprise two pressure indicating meters 7 and stop valve 8, and described stop valve 8 is connected in parallel on the closed circuit 20, and the two ends of stop valve 8 are connected with pressure indicating meter 7 respectively.Fill valve assembly 5, bidirectional hydraulic lock assembly 6, stop valve 8 are integrated into an integrated valve body, make the hydraulic system structure compactness.Fill valve assembly 5, bidirectional hydraulic lock assembly 6, pressure indicating meter 7 interfaces, stop valve 8 all can be integrated on the valve piece, make Closed Hydraulic transmission device and driving device structure compact more.Seal-off pressure oil tank 4 communicates with described integrated valve block.Other composition and annexation are identical with embodiment one or two.
Embodiment six: present embodiment can replace with the straight line oil cylinder according to actual needs with rotary actuator 9 (executive component).Other composition and annexation are identical with embodiment one.
Below only be concrete exemplary applications of the present invention, protection scope of the present invention do not constituted any limitation that all employing equivalents or equivalence are replaced and the technological scheme of formation, all drop within the rights protection scope of the present invention.
Working principle:
Among the present invention,, just can control moving direction, movement velocity and the displacement of rotary actuator 9 by changing sense of rotation, speed and the working time of AC servo motor (or variable-frequency motor) 1.Prepressing type air-strainer 3 is installed on (small-sized) seal-off pressure oil tank 4.Prepressing type air-strainer 3 is made up of air filter, breather check valve, exhaust check valve etc., thereby has simplified Oiltank structure, and its effect is to guarantee constant positive pressure in the seal-off pressure oil tank 4, improves the suction capacity of two-way metering pump 2.Fill valve assembly 5 is connected in parallel in the closed circuit, and the Fill valve two ends are connected respectively to A, the B mouth of two-way metering pump 2, and A, B mouth change oil outlet or opposite into along with the sense of rotation change of two-way metering pump 2 and by inlet port.When A is an oil outlet, when B was inlet port, A point pressure oil was pushed the plug-in type Pilot operated check valve 5-1 that links to each other with inlet port B in the Fill valve assembly 5 open, makes the inlet port B of two-way metering pump 2 communicate with seal-off pressure oil tank 4.Vice versa.So Fill valve assembly 5 guarantees the inlet port of two-way metering pump 2 and can communicate with hydraulic oil in the seal-off pressure oil tank 4 that the leakage in the compensation closed circuit guarantees that the pressure in the low pressure pipeline is pressed greater than air separation, prevents that cavitation and air from infiltrating.
The present invention removes electromagnetic direction valve, pressure valve and speed valve in the conventional hydraulic transmission system, has avoided throttling and spill losses; Substitute oil cylinder in the existing hydraulic pressure heliostat driving device as executive component with rotary actuator, saved the conversion of rectilinear movement to rotating motion, adopt AC servo motor (or the asynchronous motor of frequency variator driving among the present invention, here be called variable-frequency motor) as driving element, but the metering pump of driven by motor bi-directional rotary provides power for rotary actuator, rotation direction, running speed and running speed time by the change motor are realized direction, speed and the positioning control of tracing-positioning system, and then realize the accurate control to heliostat azimythal angle and elevation angle.
Claims (4)
1, Closed Hydraulic transmission device on a kind of heliostat that is used for solar heat power generation system, described hydraulic transmission comprises AC servo motor or variable-frequency motor (1), two-way metering pump (2), prepressing type air-strainer (3), seal-off pressure oil tank (4), Fill valve assembly (5), bidirectional hydraulic lock assembly (6) and rotary actuator (9), it is characterized in that: described AC servo motor or variable-frequency motor (1) are connected with two-way metering pump (2), constitute closed circuit (20) between two-way metering pump (2) and the rotary actuator (9), the drain tap of two-way metering pump (2) is communicated with seal-off pressure oil tank (4), prepressing type air-strainer (3) is communicated with seal-off pressure oil tank (4), Fill valve assembly (5) is connected in parallel on closed circuit (20) and upward and with seal-off pressure oil tank (4) is communicated with, and bidirectional hydraulic lock assembly (6) is connected on the closed circuit (20).
2, the Closed Hydraulic transmission device on the heliostat that is used for solar heat power generation system according to claim 1, it is characterized in that: described prepressing type air-strainer (3) is made up of air filter (3-1), breather check valve (3-2) and exhaust check valve (3-3), described breather check valve (3-2) and exhaust check valve (3-3) formation in parallel loop (3-4), air filter (3-1) is connected in series with an end of loop (3-4), and the other end of loop (3-4) is communicated with seal-off pressure oil tank (4).
3, the Closed Hydraulic transmission device on the heliostat that is used for solar heat power generation system according to claim 1 and 2, it is characterized in that: described Fill valve assembly (5) is made of two plug-in type Pilot operated check valves (5-1) serial connection.
4, the Closed Hydraulic transmission device on the heliostat that is used for solar heat power generation system according to claim 3, it is characterized in that: described bidirectional hydraulic lock assembly (6) is made up of two Pilot operated check valves (6-1), and two Pilot operated check valves (6-1) symmetry is connected on the closed circuit (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100715893A CN101509473A (en) | 2009-03-20 | 2009-03-20 | Closed type hydraulic transmission for heliostat of solar thermal power generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100715893A CN101509473A (en) | 2009-03-20 | 2009-03-20 | Closed type hydraulic transmission for heliostat of solar thermal power generation system |
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| CN101509473A true CN101509473A (en) | 2009-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2009100715893A Pending CN101509473A (en) | 2009-03-20 | 2009-03-20 | Closed type hydraulic transmission for heliostat of solar thermal power generation system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393752A (en) * | 2011-09-29 | 2012-03-28 | 南通纺织职业技术学院 | Solar tracking device and control system thereof |
| CN102392845A (en) * | 2011-11-28 | 2012-03-28 | 巨力索具股份有限公司 | Passive locking hydraulic system |
| CN103529862A (en) * | 2013-11-05 | 2014-01-22 | 华北电力大学（保定） | Intelligent tracking device of distributed type networked photovoltaic cell panel and control method of device |
| CN107247467A (en) * | 2017-08-09 | 2017-10-13 | 北京亿美博科技有限公司 | A kind of heliostat azimuth numerals hydraulic control system |
| WO2019028696A1 (en) * | 2017-08-09 | 2019-02-14 | 北京亿美博科技有限公司 | Digital hydraulic control system for solar thermal power generation reflector |
| CN109720525A (en) * | 2018-12-05 | 2019-05-07 | 燕山大学 | A kind of bionic fish tail propulsion device based on wave transmission hydraulics |
| CN112032115A (en) * | 2020-09-18 | 2020-12-04 | 长沙理工大学 | Large-scale throwing machine rotary table driving device using renewable energy sources |
-
2009
- 2009-03-20 CN CNA2009100715893A patent/CN101509473A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393752A (en) * | 2011-09-29 | 2012-03-28 | 南通纺织职业技术学院 | Solar tracking device and control system thereof |
| CN102392845A (en) * | 2011-11-28 | 2012-03-28 | 巨力索具股份有限公司 | Passive locking hydraulic system |
| CN102392845B (en) * | 2011-11-28 | 2014-08-20 | 巨力索具股份有限公司 | Passive locking hydraulic system |
| CN103529862A (en) * | 2013-11-05 | 2014-01-22 | 华北电力大学（保定） | Intelligent tracking device of distributed type networked photovoltaic cell panel and control method of device |
| CN107247467A (en) * | 2017-08-09 | 2017-10-13 | 北京亿美博科技有限公司 | A kind of heliostat azimuth numerals hydraulic control system |
| WO2019028695A1 (en) * | 2017-08-09 | 2019-02-14 | 北京亿美博科技有限公司 | Digital hydraulic control system for azimuth of heliostat |
| WO2019028696A1 (en) * | 2017-08-09 | 2019-02-14 | 北京亿美博科技有限公司 | Digital hydraulic control system for solar thermal power generation reflector |
| CN109720525A (en) * | 2018-12-05 | 2019-05-07 | 燕山大学 | A kind of bionic fish tail propulsion device based on wave transmission hydraulics |
| CN112032115A (en) * | 2020-09-18 | 2020-12-04 | 长沙理工大学 | Large-scale throwing machine rotary table driving device using renewable energy sources |
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Open date: 20090819 |