CN204285854U - oscillating heat pipe type vacuum pipe solar heat collector - Google Patents
oscillating heat pipe type vacuum pipe solar heat collector Download PDFInfo
- Publication number
- CN204285854U CN204285854U CN201420740852.XU CN201420740852U CN204285854U CN 204285854 U CN204285854 U CN 204285854U CN 201420740852 U CN201420740852 U CN 201420740852U CN 204285854 U CN204285854 U CN 204285854U
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- China
- Prior art keywords
- heat
- vacuum tube
- heat pipe
- oscillating
- aluminium flake
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000010521 absorption reaction Methods 0.000 claims abstract description 54
- 239000011248 coating agent Substances 0.000 claims abstract description 12
- 238000000576 coating method Methods 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims description 18
- 230000005855 radiation Effects 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 8
- 239000008358 core component Substances 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 5
- 239000006096 absorbing agent Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000012546 transfer Methods 0.000 abstract description 22
- 229910052782 aluminium Inorganic materials 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 241000973497 Siphonognathus argyrophanes Species 0.000 description 2
- 230000002528 anti-freeze Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- OVARTBFNCCXQKS-UHFFFAOYSA-N propan-2-one;hydrate Chemical compound O.CC(C)=O OVARTBFNCCXQKS-UHFFFAOYSA-N 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- JOHZPMXAZQZXHR-UHFFFAOYSA-N pipemidic acid Chemical compound N1=C2N(CC)C=C(C(O)=O)C(=O)C2=CN=C1N1CCNCC1 JOHZPMXAZQZXHR-UHFFFAOYSA-N 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Classifications
-
- 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
- Y02E10/44—Heat exchange systems
Landscapes
- Photovoltaic Devices (AREA)
Abstract
A vibration heat pipe type vacuum tube solar heat collector is characterized by mainly comprising a vibration heat pipe (3), a vacuum pipe (5), a heat collection sleeve (2), a heat absorption aluminum sheet (7), a wrapping heat transfer fin (8) and a support rib column (9). The utility model is characterized in that the selective absorbing coating is coated on the outer surface of the heat absorbing aluminum sheet tightly attached to the inner wall of the vacuum tube, and the heat is transferred to the wrapping heat transfer fin and the oscillating heat tube through the heat absorbing aluminum sheet, so that the working medium in the tube circularly oscillates, and the heat collection and the transfer are realized.
Description
Technical field:
The utility model be a kind of oscillating heat pipe that adopts as the vacuum tube solar heating element of heat transfer element, specifically a kind of oscillating heat pipe formula vacuum tube solar heating element, belongs to application of solar.
Background technology:
Solar energy is a kind of abundant, resource that distribution is extremely wide, if can development and utilization in large quantities, while providing clean energy resource to the mankind, can also reach the requirement of no pollution and zero-emission, can greatly promote and accelerate the realization of China's target for energy-saving and emission-reduction.
The Application way of solar energy is diversified.At present, no matter solar water heater is all widely used in industry or family expenses, and heat collector is a core component of solar water heater.On domestic market, the kind of solar thermal collector is more, great majority adopt waterpipe type and the large class heat transfer structure of heat pipe-type two, although waterpipe type heat transfer structure structure is simple, with low cost, but the water in this heat collector can not be emptying, when ambient temperature is too low, the water in heat collector will freezing and expansion, damage vacuum tube, bring inconvenience to user.
Compare waterpipe type, heat pipe-type not only solves the problem of many waterpipe types, and has possessed a lot of its own advantages.Particularly along with the heat dissipation problem of electron trade highlights day by day, oscillating heat pipe is made to obtain very large development and application.Compare conventional heat pipe, oscillating heat pipe be easy to microminaturization, can flexible arrangement and be easy to the features such as processing and manufacturing, particularly heat transfer property is better than general heat pipe, adds the improvement to heat collector internal structure, substantially increases collecting efficiency.
Summary of the invention:
The purpose of this utility model is the deficiency improving prior art, provides a kind of oscillating heat pipe formula heat exchange device of vacuum tube solar collector, improves the collecting efficiency of vacuum tube solar heating element.
The purpose of this utility model is achieved in that
A kind of oscillating heat pipe formula vacuum tube solar heating element, it forms primarily of oscillating heat pipe 3, vacuum tube 5, thermal-arrest sleeve pipe 2, heat absorption aluminium flake 7, parcel thermofin 8 and ribs post 9, wherein, oscillating heat pipe and vacuum tube are the core components of collector arrangement, heat absorption aluminium flake is the critical piece of radiation-absorbing heat, and thermofin is that conduct radiation heat is to the vitals of heat pipe.The bringing-up section parcel thermofin 8 of oscillating heat pipe 3 described in every root tightly wraps up and interts into both wings fin, and by heat-conducting glue close adhesion on heat absorption aluminium flake 7, heat absorption aluminium flake 7 outer surface scribbles solar energy absorbing coating, and be close on vacuum tube 5 inner tubal wall, heat absorption aluminium flake 7 is cylindrical, heat absorption aluminium flake 7 central hollow section inserts ribs post 9, and ribs post 9 four angles withstand on four oscillating heat pipes 3 respectively, prevents oscillating heat pipe 3 from loosening and departs from.
Thermal Conduction Equipment in vacuum tube is loop oscillating heat pipe.
Described heat absorption aluminium flake 7 is close on vacuum tube 5 inner tubal wall, makes radiation daylighting area reach maximum.
Described vacuum tube 5 exit fills right sealing plug 4, can close inner air tube, avoids the heat loss of its flowing and generation.
Below described vacuum tube 5, the distance of 80-250 millimeter is provided with reflector 13, can reflecting part luminous energy on absorber plate, reduce radiation heat loss.
A kind of oscillating heat pipe formula vacuum tube solar heating element device, is made up of oscillating heat pipe, vacuum tube, thermal-arrest sleeve pipe, reflector, heat absorption aluminium flake, parcel thermofin, sealing plug and ribs post eight major part.Oscillating heat pipe and vacuum tube are the core components of heat collector, wherein, oscillating heat pipe is processed into the loop structure of 2 elbows, 4 straight lengths, topping up working medium is intersolubility double-work medium, the selection of working medium and pairing, liquid filled ratio and volume proportion obtain according to hot working fluid physical property and lot of experiments, and the working medium combination that wherein under minimum, the middle low power of starting power, heat transfer property is best in operating temperature range, stability is best should be optimal selection.The acetone-water double-work medium that oscillating heat pipe in the utility model chooses 50% liquid filled ratio, volume proportion is 0.9:0.1 is as topping up medium.Oscillating heat pipe bringing-up section scribbles one deck heat-conducting glue, then tightly wraps up with aluminium flake, and the interspersed both wings fin forming heat pipe, ride on the madial wall of heat absorption aluminium flake; According to pipe size in vacuum tube, heat absorption aluminium flake ring is become circular again, annulus lateral wall scribbles coating for selective absorption, inner side pressing has thermofin and oscillating heat pipe, circle ring center inserts ribs post, ribs post four angles withstand on 4 straight lengths of every root oscillating heat pipe respectively, prevent heat pipe from loosening and depart from; Then the bringing-up section of oscillating heat pipe and all connected suctions, parts entirety of conducting heat are inserted in vacuum tube, finally, with sealing plug, the vacuum tube mouth of pipe is sealed.Oscillating heat pipe mid portion leaves very short adiabatic section, wraps with insulation material, and cooling section directly inserts in thermal-arrest sleeve pipe, for heating the fluid flowing through sleeve pipe.
Operation principle of the present utility model is: sunshine is irradiated on the heat absorption aluminium flake of vacuum tube inwall through glass tube with vacuum, the coating for selective absorption be painted on heat absorption aluminium flake absorbs, heat absorption aluminium flake temperature raises, heat passes to the fire end of oscillating heat pipe by the thermofin ridden in inner wall surface thereof, start to open after oscillating heat pipe internal working medium is heated and shake, along with the increase of solar radiation intensity, intraductal working medium Oscillation Flows is aggravated, heat transfer property significantly improves, when working medium flows through cooling section, heat is passed to the fluid of heat pipe cold junction.The utility model, in order to reduce the loss of vacuum tube radiant heat absorption, is added with reflector below vacuum tube, improves photothermal absorption efficiency further.
The utility model compared with the prior art, there is following distinguishing feature and good effect: first, added hot fluid and only flowed through sleeve pipe, directly heated by heat pipe, so do not exist as waterpipe type vacuum heat collection pipe when ambient temperature is too low, there is booster phenomenon in internal water freezing and expansion, brings inconvenience to user; Secondly, compared to ordinary hot tubular type vacuum tube solar heating element in the market, oscillating heat pipe is easier to flexible arrangement in vacuum tube, and processes simple, lightweight, low cost of manufacture; The version of heat pipe, heat transfer area and length can adjust flexibly according to technological requirement; Suitable working medium combination and proportioning, can reduce starting power and the heat transfer resistance of heat pipe greatly; Meanwhile, oscillating heat pipe is very sensitive to solar radiant heat Strength Changes, strong adaptability, and heat transfer property is good.
In ordinary hot tubular type vacuum tube solar heating element, coating for selective absorption is generally be coated on vacuum tube inner tubal wall, the heat exchange of general heat pipe and vacuum tube inwall is conducted by the fin be arranged between heat pipe and vacuum tube inwall, the contact performance of fin and inner tubal wall, can affect heat-absorption properties and the heat transfer property of heat pipe.And to be of the present utility modelly characterised in that, coating for selective absorption is coated on heat absorption aluminium flake, and the aluminium flake that absorbs heat is contacted with the tight face of heat pipe by heat transfer aluminum fin-stock, thus make heat-conductive characteristic better, therefore, the advantage that the oscillating heat pipe formula vacuum tube solar heating element that solar energy vacuum tube and oscillating heat pipe combine composition is summarized both and one, make it have that heat loss is low, heat transfer property is good, be easy to processing and fabricating, heat pipe flexible arrangement, cost are low, use is reliable, and without the need to antifreeze and without outstanding features such as foulings.
Accompanying drawing illustrates:
Fig. 1 is overall structure schematic diagram of the present utility model.
Fig. 2 is internal structure schematic diagram of the present utility model.
Fig. 3 is the structural representation of heat collector of the present utility model.
Fig. 4 is the structural representation of oscillating heat pipe of the present utility model.
Fig. 5 is the front view of ribs of the present utility model.
Fig. 6 is the left view of ribs of the present utility model.
In figure, each part numbers is as follows: 1 be heat-insulation layer, 2 be thermal-arrest sleeve pipe, 3 be oscillating heat pipe, 4 be sealing plug, 5 be vacuum tube, 6 be coating for selective absorption, 7 be heat absorption aluminium flake, 8 for parcel thermofin, 9 be ribs post, 10 be spring support, 11 be getter, 12 be support, 13 for reflector.
Specific embodiments:
Below in conjunction with accompanying drawing and case study on implementation, the utility model is described in further detail.
As Fig. 1 to 6, a kind of oscillating heat pipe formula vacuum tube solar heating element, it forms primarily of oscillating heat pipe 3, vacuum tube 5, thermal-arrest sleeve pipe 2, heat absorption aluminium flake 7, parcel thermofin 8 and ribs post 9, wherein, oscillating heat pipe and vacuum tube are the core components of collector arrangement, heat absorption aluminium flake is the critical piece of radiation-absorbing heat, and thermofin is that conduct radiation heat is to the vitals of heat pipe.The bringing-up section parcel thermofin 8 of oscillating heat pipe 3 described in every root tightly wraps up and interts into both wings fin, and by heat-conducting glue close adhesion on heat absorption aluminium flake 7, heat absorption aluminium flake 7 outer surface scribbles solar energy absorbing coating, and be close on vacuum tube 5 inner tubal wall, heat absorption aluminium flake 7 is cylindrical, heat absorption aluminium flake 7 central hollow section inserts ribs post 9, and ribs post 9 four angles withstand on four oscillating heat pipes 3 respectively, prevents oscillating heat pipe 3 from loosening and departs from.
Thermal Conduction Equipment in vacuum tube is loop oscillating heat pipe.
The utility model is for In Nanjing solar radiation intensity, environment temperature and technological requirement, be designed to the loop-type oscillating heat pipe structure that every root vacuum tube internal placement one is made up of 2 detour, 4 straight lengths, working medium selects intersolubility double-work medium, the basic design parameters optimal design as requested such as liquid filled ratio, working medium volume proportion, caliber and length.
Described heat absorption aluminium flake 7 is close on vacuum tube 5 inner tubal wall, makes radiation daylighting area reach maximum.
Solar energy absorbing coating is coated on the outer surface of heat absorption aluminium flake, can farthest absorb solar radiation heat, and heat is concentrated on heat absorption aluminium flake.
Heat transfer aluminum fin-stock hard-pressed bale at the fire end of oscillating heat pipe, and interts into both wings fin and is close on heat absorption aluminium flake, has the heat-conductive characteristic quickly and efficiently radiant heat that heat absorption aluminium flake absorbs being passed to heat pipe.
Annular heat absorption aluminium flake hollow parts inserts the ribs post that non-thermally conductive material is made, four corners of ribs post withstand on four oscillating heat pipes respectively, prevent oscillating heat pipe from loosening from annular heat absorption aluminium sheet, or the micro-strain produced because of inner unbalance stress.
Described vacuum tube 5 exit fills right sealing plug 4, can close inner air tube, avoids the heat loss of its flowing and generation.
Below described vacuum tube 5, the distance of 80-250 millimeter is provided with reflector 13, can reflecting part luminous energy on absorber plate, reduce radiation heat loss.
Case study on implementation: a kind of oscillating heat pipe formula vacuum tube solar heating element device, as Fig. 1 to Fig. 3, its part has oscillating heat pipe 3, vacuum tube 5, thermal-arrest sleeve pipe 2, reflector 13, heat absorption aluminium flake 7, parcel thermofin 8, sealing plug 4 and ribs post 9.Wherein, oscillating heat pipe 3 and vacuum tube 5 are core components of collector arrangement.Through a large amount of theory calculate and experimental study, obtain the machined parameters of oscillating heat pipe 3 under optimum Working, oscillating heat pipe 3 is processed to the closed-loop path of two elbows, 4 straight lengths, as shown in Figure 4, internal working medium selects alcohol-water or the acetone-water mixture of certain volume proportioning and liquid filled ratio respectively.Afterwards, oscillating heat pipe 3 bringing-up section is coated with last layer heat-conducting glue, with aluminium flake the bringing-up section of every root oscillating heat pipe 1 is packed tightly and intert into both wings fin, be close on heat absorption aluminium flake 7 medial surface, heat absorption aluminium flake 7 lateral wall coats coating for selective absorption 6.Afterwards, according to vacuum tube inner diameter, heat absorption aluminium flake 7 ring is become cylindrical, put into vacuum tube, the cated side of painting is made to be close to vacuum tube inwall, insert ribs post 9 (as Fig. 5, Fig. 6) at heat absorption aluminium flake 7 hollow parts again, ribs post 9 four angles withstand on four oscillating heat pipes 3 respectively, prevent heat pipe from loosening and depart from.Finally, with sealing plug 4, the vacuum tube mouth of pipe is sealed, design sketch is shown in Fig. 2.Oscillating heat pipe 3 mid portion leaves adiabatic section, and cooling section directly inserts in parallel sleeve pipe 2 and heats the fluid flowing through sleeve pipe, and final effect figure is shown in figure.
Of the present utility modelly be characterised in that coating for selective absorption is coated on the outer surface of the heat absorption aluminium flake being close to vacuum tube inwall, parcel thermofin and oscillating heat pipe is given by heat absorption aluminium flake transferring heat, impel intraductal working medium to circulate to vibrate, realize collection and the transmission of heat.Several large feature of the present utility model: oscillating heat pipe is Efficient Heat Transfer Exchanger, have structure simple, manufacture conveniently, low, the lightweight feature of cost, and can start fast under normal temperature environment, the efficient heat transfer under unidirectional heat transfer, less calorific intensity and the steady heat transfer performance under higher-wattage; Be highly suitable for the hot Collection and use of the not high solar energy of heat flow density.Glass tube with vacuum has the highly transmissive energy of high heat preservation performance and sunshine; Fitting tightly of heat absorption aluminium flake, heat transfer aluminum fin-stock and oscillating heat pipe, ensure that photothermal high-absorbable and heat conducting high efficiency.Therefore, oscillating heat pipe formula vacuum tube solar heating element integrates many advantages, has that heat loss is low, heat transfer property is good, be easy to processing and fabricating, heat pipe flexible arrangement, cost are low, use is reliable, and without the need to antifreeze and without outstanding features such as foulings.
Embodiment recited above is only be described preferred embodiment of the present utility model; not design of the present utility model and scope are limited; do not departing under the utility model design concept prerequisite; the various modification that in this area, common engineers and technicians make the technical solution of the utility model and improvement; all should fall into protection domain of the present utility model, the technology contents of the utility model request protection is all recorded in detail in the claims.
Claims (5)
1. an oscillating heat pipe formula vacuum tube solar heating element, it is characterized in that it is primarily of oscillating heat pipe (3), vacuum tube (5), thermal-arrest sleeve pipe (2), heat absorption aluminium flake (7), parcel thermofin (8) and ribs post (9) composition, wherein, oscillating heat pipe and vacuum tube are the core components of collector arrangement, heat absorption aluminium flake is the critical piece of radiation-absorbing heat, thermofin is that conduct radiation heat is to the vitals of heat pipe, bringing-up section parcel thermofin (8) of oscillating heat pipe (3) described in every root is tightly wrapped up and interts into both wings fin, and by heat-conducting glue close adhesion in heat absorption aluminium flake (7), heat absorption aluminium flake (7) outer surface scribbles solar energy absorbing coating, and be close on vacuum tube (5) inner tubal wall, heat absorption aluminium flake (7) is cylindrical, heat absorption aluminium flake (7) central hollow section inserts ribs post (9), ribs post (9) four angles withstand on four oscillating heat pipes (3) respectively, prevent from oscillating heat pipe (3) from loosening to depart from.
2. a kind of oscillating heat pipe formula vacuum tube solar heating element according to claim 1, is characterized in that: the Thermal Conduction Equipment in described vacuum tube is loop oscillating heat pipe.
3. a kind of oscillating heat pipe formula vacuum tube solar heating element according to claim 1, is characterized in that: described heat absorption aluminium flake (7) is close on vacuum tube (5) inner tubal wall, makes radiation daylighting area reach maximum.
4. a kind of oscillating heat pipe formula vacuum tube solar heating element according to claim 1, is characterized in that: described vacuum tube (5) exit fills right sealing plug (4), can close inner air tube, avoids the heat loss of its flowing and generation.
5. a kind of oscillating heat pipe formula vacuum tube solar heating element according to claim 1, it is characterized in that: the distance of described vacuum tube (5) below 80-250 millimeter is provided with reflector (13), can reflecting part luminous energy on absorber plate, reduce radiation heat loss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420740852.XU CN204285854U (en) | 2014-12-01 | 2014-12-01 | oscillating heat pipe type vacuum pipe solar heat collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420740852.XU CN204285854U (en) | 2014-12-01 | 2014-12-01 | oscillating heat pipe type vacuum pipe solar heat collector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204285854U true CN204285854U (en) | 2015-04-22 |
Family
ID=52869005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420740852.XU Expired - Fee Related CN204285854U (en) | 2014-12-01 | 2014-12-01 | oscillating heat pipe type vacuum pipe solar heat collector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204285854U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105241094A (en) * | 2015-09-24 | 2016-01-13 | 山东安纳吉能源科技发展有限公司 | Solar autoexcitation oscillation enhancing heat exchanging device and solar thermal collector |
| CN106288452A (en) * | 2016-10-31 | 2017-01-04 | 天津城建大学 | A kind of tapered divergent nozzle formula heat pipe solar energy water heater |
| CN110579026A (en) * | 2019-08-02 | 2019-12-17 | 广东工业大学 | Line focusing type pulsating heat pipe vacuum heat collecting device |
-
2014
- 2014-12-01 CN CN201420740852.XU patent/CN204285854U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105241094A (en) * | 2015-09-24 | 2016-01-13 | 山东安纳吉能源科技发展有限公司 | Solar autoexcitation oscillation enhancing heat exchanging device and solar thermal collector |
| CN105241094B (en) * | 2015-09-24 | 2017-03-22 | 山东安纳吉能源科技发展有限公司 | Solar autoexcitation oscillation enhancing heat exchanging device and solar thermal collector |
| CN106288452A (en) * | 2016-10-31 | 2017-01-04 | 天津城建大学 | A kind of tapered divergent nozzle formula heat pipe solar energy water heater |
| CN110579026A (en) * | 2019-08-02 | 2019-12-17 | 广东工业大学 | Line focusing type pulsating heat pipe vacuum heat collecting device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150422 Termination date: 20161201 |