CN109639228A - A kind of power supply dislocation generation photovoltaic devices - Google Patents
A kind of power supply dislocation generation photovoltaic devices Download PDFInfo
- Publication number
- CN109639228A CN109639228A CN201811527960.8A CN201811527960A CN109639228A CN 109639228 A CN109639228 A CN 109639228A CN 201811527960 A CN201811527960 A CN 201811527960A CN 109639228 A CN109639228 A CN 109639228A
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- Prior art keywords
- fixing piece
- threaded rod
- connecting plate
- connector
- gear
- Prior art date
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- 238000010248 power generation Methods 0.000 claims abstract description 19
- 238000004891 communication Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 12
- 230000005611 electricity Effects 0.000 abstract description 6
- 238000005286 illumination Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000013016 damping Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000872 buffer Substances 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S20/00—Supporting structures for PV modules
- H02S20/30—Supporting structures being movable or adjustable, e.g. for angle adjustment
- H02S20/32—Supporting structures being movable or adjustable, e.g. for angle adjustment specially adapted for solar tracking
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
- H02S10/40—Mobile PV generator systems
-
- 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
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The invention discloses a kind of power supply dislocation generation photovoltaic devices, including fixing piece, supporting element, connector, connecting plate, power generation photovoltaic module and control system；Multiple supporting elements are set at the top of fixing piece, connect connector at the top of supporting element；Connector is horizontally disposed, and multiple power generation photovoltaic modulies are arranged on connector；First motor is arranged in connector bottom, and first motor output end connects the first threaded rod；First threaded rod is vertically arranged, and the first threaded rod bottom end passes through connecting plate and connects locating part, and the first threaded rod is threadedly coupled with connecting plate；The photovoltaic module that generates electricity includes mounting plate, photosensitive sensor, photovoltaic panel, fixed frame, rotating member, gear and rack gear.The present invention can automatically adjust the angle of photovoltaic panel according to different directions intensity of illumination, and generating efficiency is high, and by setting multiple groups power generation photovoltaic module, further increase generating efficiency, and convenient for moving to device, and relatively stable in moving process.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation more particularly to a kind of power supply dislocation generation photovoltaic devices.
Background technique
With the development of society, the mankind are increasingly urgent to the needs of new energy, solar energy as a kind of green novel energy source, because
Its feature such as renewable, innumerable and environmental clean becomes new energy representative, also will be following favorite, and generate electricity photovoltaic
Device is as its name suggests a kind of device for converting the solar into electric energy；
Existing power generation photovoltaic devices are difficult to adjust the direction of photovoltaic panel, and then generating efficiency according to solar irradiation direction
It is lower and more time-consuming and laborious to the movement of device.
Summary of the invention
To solve technical problem present in background technique, the present invention proposes a kind of power supply dislocation generation photovoltaic devices,
The angle of photovoltaic panel can be automatically adjusted according to different directions intensity of illumination, generating efficiency is high, and passes through setting multiple groups power generation light
Component is lied prostrate, further increases generating efficiency, and convenient for moving to device, and relatively stable in moving process.
A kind of power supply dislocation generation photovoltaic devices, including fixing piece, supporting element, connector, connection proposed by the present invention
Plate, power generation photovoltaic module and control system；Multiple supporting elements are set at the top of fixing piece, connect connector at the top of supporting element；Connection
Part is horizontally disposed, and multiple power generation photovoltaic modulies are arranged on connector；
Connecting plate is set to below connector, and connecting plate is horizontally disposed；Connector bottom setting first motor, first
Motor output end connects the first threaded rod；First threaded rod is vertically arranged, and the first threaded rod bottom end passes through connecting plate connection limit
Position part, and the first threaded rod is threadedly coupled with connecting plate；Multiple guide parts are arranged in connecting plate bottom, and setting is multiple at the top of fixing piece
Pipe is plugged and fixed in the fixing pipe matched with guide part, guide part；
The photovoltaic module that generates electricity includes mounting plate, photosensitive sensor, photovoltaic panel, fixed frame, rotating member, gear and rack gear；
Fixed frame is vertically, opening to be arranged on fixed frame, and rotating member is respectively arranged in opening；Rotating member connection is solid
Determine frame, gear is rotatablely connected rotating member；Placing groove is set inside fixed frame, and rack gear is vertically arranged, and rack gear top, which is located at, places
In slot, rack gear bottom end passes through connector and connect with connecting plate；The gear teeth are arranged close to gear side in rack gear, and rack gear engages tooth connection
Wheel；Mounting plate is set on the outside of fixed frame, mounting plate connection gear；Photovoltaic panel is set on mounting plate, is arranged in photovoltaic panel photosensitive
Sensor；
When connecting plate rises to highest point, rack gear tip contact fixed frame, pipe is still plugged and fixed in guide part at this time；
When connecting plate drops to minimum point, connecting plate bottom contacts locating part, this hour rack top is still engaged with gear；
Empty cabin is set inside fixing piece, the second motor, the second threaded rod, sliding panel and universal wheel are set in empty cabin；Second
Connection fixture at the top of motor, the second motor output end connect the second threaded rod；Second threaded rod is vertically arranged, the second screw thread
Bar bottom end passes through sliding panel and is rotatablely connected fixing piece, and the second threaded rod is threadedly coupled sliding panel；Sliding panel is slidably connected fixation
Part, and multiple universal wheels are arranged in sliding panel bottom；Multiple through-holes passed through for universal wheel are arranged in fixing piece bottom；
When sliding panel drops to minimum point, universal wheel is pierced by from the through-hole of fixing piece bottom；
When sliding panel rises to highest point, universal wheel is fully located inside fixing piece；
Control system is set on fixing piece, the input terminal of photosensitive sensor communication connection control system, control system it is defeated
Outlet communication connection first motor and the second motor.
Preferably, generate electricity photovoltaic module number be two groups.
Preferably, sliding part is set on sliding panel, and the sliding slot matched with sliding part is arranged in fixing piece inner wall, and sliding part is sliding
Dynamic connection fixture.
Preferably, multiple fixed links are set inside fixing piece, and fixed link is vertically arranged, and fixed link connection fixture.
Preferably, sliding panel is slidably connected fixed link.
Preferably, elastic component is socketed in fixed link.
Preferably, elastic component is vertically arranged, and elastic component top connects sliding panel, bottom end connection fixture.
In the present invention, photosensitive sensor detects the sunlight exposure intensity of different directions, and passes the information on to control
System processed, control system control first motor starting, and an electric motor drives the rotation of the first threaded rod, so that connecting plate be driven to carry out
Vertical direction moves up and down, and then carries out vertical direction with carry-over bar and move up and down, and the rotation of rack drives gear is realized automatic
The angle for adjusting photovoltaic panel, improves the generating efficiency of device, by setting multiple groups power generation photovoltaic module, further increases device
Generating efficiency, and by setting guide part and fixing pipe, guiding role is played to the movement of connecting plate, is moved through connecting plate
Cheng Gengjia stablizes；Start the second motor, the second motor drives the rotation of the second threaded rod, so that sliding panel be driven to carry out vertical direction
It moves up and down, when needing to move device, drives universal wheel to be moved straight down by sliding panel, universal wheel
It is pierced by from the through-hole of fixing piece bottom, device can be moved at this time；Conversely, then device is fixed.
In the present invention, sliding panel carries out vertical direction and slides above and below, and then sliding part is driven to slide in sliding slot, slides
Process is more stable.
In the present invention, when needing to fall universal wheel, sliding panel is moved straight down, and sliding panel applies elastic component
Pressure, elastic component is in compressive state, during mobile device, elastic component to the vibration being subject in device moving process into
Row buffering can be improved the damping effect of device, make more stable in device moving process.
Detailed description of the invention
Fig. 1 is the structural schematic diagram in a kind of power supply dislocation generation photovoltaic devices proposed by the present invention.
Fig. 2 is the front view that dislocation generation photovoltaic devices are used in a kind of power supply proposed by the present invention.
Fig. 3 is the structural schematic diagram of power generation photovoltaic module in theme proposed by the present invention.
Fig. 4 is the structural schematic diagram of fixing piece in theme proposed by the present invention.
In figure: 1, fixing piece；2, supporting element；3, connector；4, generate electricity photovoltaic module；5, first motor；6, the first screw thread
Bar；7, connecting plate；8, locating part；9, guide part；10, fixing pipe；11, mounting plate；12, photosensitive sensor；13, photovoltaic panel；14,
Fixed frame；15, rotating member；16, gear；17, rack gear；18, it is open；19, the second motor；20, the second threaded rod；21, sliding panel；
22, fixed link；23, elastic component；24, universal wheel；25, sliding slot；26, sliding part.
Specific embodiment
As shown in Figs 1-4, Fig. 1 is the structural representation in a kind of power supply dislocation generation photovoltaic devices proposed by the present invention
Figure.
Fig. 2 is the front view that dislocation generation photovoltaic devices are used in a kind of power supply proposed by the present invention.
Fig. 3 is the structural schematic diagram of power generation photovoltaic module in theme proposed by the present invention.
Fig. 4 is the structural schematic diagram of fixing piece in theme proposed by the present invention.
Referring to Fig.1-4, it is proposed by the present invention it is a kind of power supply use dislocation generation photovoltaic devices, including fixing piece 1, supporting element 2,
Connector 3, connecting plate 7, power generation photovoltaic module 4 and control system；Multiple supporting elements 2 are set at the top of fixing piece 1, and supporting element 2 pushes up
Portion connects connector 3；Connector 3 is horizontally disposed, and multiple power generation photovoltaic modulies 4 are arranged on connector 3；
Connecting plate 7 is set to 3 lower section of connector, and connecting plate 7 is horizontally disposed；First motor is arranged in 3 bottom of connector
5,5 output end of first motor connects the first threaded rod 6；First threaded rod 6 is vertically arranged, and 6 bottom end of the first threaded rod, which passes through, to be connected
Fishplate bar 7 connects locating part 8, and the first threaded rod 6 is threadedly coupled with connecting plate 7；Multiple guide parts 9 are arranged in 7 bottom of connecting plate, Gu
Determine that multiple fixing pipes 10 matched with guide part 9 are arranged at the top of part 1, pipe 10 is plugged and fixed in guide part 9；
The photovoltaic module 4 that generates electricity includes mounting plate 11, photosensitive sensor 12, photovoltaic panel 13, fixed frame 14, rotating member 15, tooth
Wheel 16 and rack gear 17；
Fixed frame 14 is that vertically, setting opening 18 on fixed frame 14, rotating member 15 is respectively arranged in opening 18；Turn
Moving part 15 is connected and fixed frame 14, and gear 16 is rotatablely connected rotating member 15；Placing groove is set inside fixed frame 14, and rack gear 17 is vertical
Setting, 17 top of rack gear are located in placing groove, and 17 bottom end of rack gear passes through connector 3 and connect with connecting plate 7；Rack gear 17 is close to gear
The gear teeth are arranged in 16 sides, and rack gear 17 engages connection gear 16；Mounting plate 11 is set to 14 outside of fixed frame, 11 tooth connection of mounting plate
Wheel 16；Photovoltaic panel 13 is set on mounting plate 11, photosensitive sensor 12 is set in photovoltaic panel 13；
When connecting plate 7 rises to highest point, 17 tip contact fixed frame 14 of rack gear, guide part 9 is still plugged and fixed at this time
Pipe 10；
When connecting plate 7 drops to minimum point, 7 bottom of connecting plate contact locating part 8, this 17 top of hour rack still with gear
16 engagements；
Empty cabin is set inside fixing piece 1, the second motor 19 of setting in empty cabin, the second threaded rod 20, sliding panel 21 and universal
Wheel 24；Second motor, 19 top connection fixture 1,19 output end of the second motor connect the second threaded rod 20；Second threaded rod 20
It is vertically arranged, 20 bottom end of the second threaded rod passes through sliding panel 21 and is rotatablely connected fixing piece 1, and the second threaded rod 20 is threadedly coupled
Sliding panel 21；Sliding panel 21 is slidably connected fixing piece 1, and multiple universal wheels 24 are arranged in 21 bottom of sliding panel；1 bottom of fixing piece is set
Set multiple through-holes passed through for universal wheel 24；
When sliding panel 21 drops to minimum point, universal wheel 24 is pierced by from the through-hole of 1 bottom of fixing piece；
When sliding panel 21 rises to highest point, universal wheel 24 is fully located inside fixing piece 1；
Control system is set on fixing piece 1, the input terminal of 12 communication connection control system of photosensitive sensor, control system
Output end communication connection first motor 5 and the second motor 19.
In the present embodiment, photosensitive sensor 12 detects the sunlight exposure intensity of different directions, and passes the information on
To control system, control system controls first motor 5 and starts, and first motor 5 drives the rotation of the first threaded rod 6, thus the company of drive
Fishplate bar 7 carries out vertical direction and moves up and down, and then carries out vertical direction with carry-over bar 17 and move up and down, and rack gear 17 is with moving gear
16 rotations, realize the angle of automatic adjustment photovoltaic panel 13, improve the generating efficiency of device, pass through setting multiple groups power generation photovoltaic module
4, the generating efficiency of device is further increased, and by setting guide part 9 and fixing pipe 10, play to the movement of connecting plate 7
Guiding role keeps 7 moving process of connecting plate more stable；Start the second motor 19, the second motor 19 drives the second threaded rod 20
Rotation moves up and down so that sliding panel 21 be driven to carry out vertical direction, when needing to move device, passes through sliding panel
21 drive universal wheels 24 moved straight down, universal wheel 24 is pierced by from the through-hole of 1 bottom of fixing piece, at this time can to device into
Row movement；Conversely, then device is fixed.
In a specific embodiment, the number of power generation photovoltaic module 4 is two groups.
Further, sliding part 26 is set on sliding panel 21, and the sliding slot matched with sliding part 26 is arranged in 1 inner wall of fixing piece
25, sliding part 26 is slidably connected fixing piece 1.In work, sliding panel 21 carries out vertical direction and slides above and below, and then drives sliding
Part 26 slides in sliding slot 25, and sliding process is more stable.
Further, multiple fixed links 22 are set inside fixing piece 1, and fixed link 22 is vertically arranged, and fixed link 22 connects
Connect fixing piece 1；Sliding panel 21 is slidably connected fixed link 22, and elastic component 23 is socketed in fixed link 22；Elastic component 23 is vertically arranged,
And 23 top of elastic component connects sliding panel 21, bottom end connection fixture 1.In work, when needing to fall universal wheel 24, sliding panel
21 are moved straight down, and sliding panel 21 applies pressure to elastic component 23, and elastic component 23 is in compressive state, in mobile device
During, elastic component 23 buffers the vibration being subject in device moving process, can be improved the damping effect of device, makes
It is more stable in device moving process.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (7)
1. a kind of power supply dislocation generation photovoltaic devices, which is characterized in that including fixing piece (1), supporting element (2), connector
(3), connecting plate (7), power generation photovoltaic module (4) and control system；Multiple supporting elements (2), supporting element are set at the top of fixing piece (1)
(2) top connects connector (3)；Connector (3) is horizontally disposed, and multiple power generation photovoltaic modulies are arranged on connector (3)
(4)；
Connecting plate (7) is set to below connector (3), and connecting plate (7) is horizontally disposed；Connector (3) bottom setting first
Motor (5), first motor (5) output end connect the first threaded rod (6)；First threaded rod (6) is vertically arranged, the first threaded rod
(6) bottom end passes through connecting plate (7) connection locating part (8), and the first threaded rod (6) is threadedly coupled with connecting plate (7)；Connecting plate
(7) multiple guide parts (9) are arranged in bottom, and multiple fixing pipes (10) matched with guide part (9) are arranged at the top of fixing piece (1),
Pipe (10) are plugged and fixed in guide part (9)；
Power generation photovoltaic module (4) includes mounting plate (11), photosensitive sensor (12), photovoltaic panel (13), fixed frame (14), rotating member
(15), gear (16) and rack gear (17)；
Fixed frame (14) is that vertically, setting opening (18), rotating member (15) are respectively arranged at opening on fixed frame (14)
(18) in；Rotating member (15) is connected and fixed frame (14), and gear (16) is rotatablely connected rotating member (15)；Setting inside fixed frame (14)
Placing groove, rack gear (17) are vertically arranged, and rack gear (17) top is located in placing groove, and rack gear (17) bottom end passes through connector (3)
It is connect with connecting plate (7)；The gear teeth are arranged close to gear (16) side in rack gear (17), and rack gear (17) engages connection gear (16)；Peace
Loading board (11) is set on the outside of fixed frame (14), mounting plate (11) connection gear (16)；Photovoltaic panel is arranged on (11) in mounting plate
(13), photosensitive sensor (12) are set in photovoltaic panel (13)；
When connecting plate (7) rises to highest point, rack gear (17) tip contact fixed frame (14), guide part (9) still grafting at this time
Fixing pipe (10)；
When connecting plate (7) drops to minimum point, connecting plate (7) bottom contact locating part (8), this hour rack (17) top still with
Gear (16) engagement；
Empty cabin is set inside fixing piece (1), setting the second motor (19) in empty cabin, the second threaded rod (20), sliding panel (21) and
Universal wheel (24)；Connection fixture (1) at the top of second motor (19), the second motor (19) output end connect the second threaded rod
(20)；Second threaded rod (20) is vertically arranged, and the second threaded rod (20) bottom end passes through sliding panel (21) and is rotatablely connected fixing piece
(1), and the second threaded rod (20) is threadedly coupled sliding panel (21)；Sliding panel (21) is slidably connected fixing piece (1), and sliding panel
(21) multiple universal wheels (24) are arranged in bottom；Multiple through-holes passed through for universal wheel (24) are arranged in fixing piece (1) bottom；
When sliding panel (21) drops to minimum point, universal wheel (24) is pierced by from the through-hole of fixing piece (1) bottom；
When sliding panel (21) rises to highest point, it is internal that universal wheel (24) is fully located at fixing piece (1)；
Control system is set on fixing piece (1), the input terminal of photosensitive sensor (12) communication connection control system, control system
Output end communication connection first motor (5) and the second motor (19).
2. a kind of power supply dislocation generation photovoltaic devices according to claim 1, which is characterized in that power generation photovoltaic module
(4) number is two groups.
3. a kind of power supply dislocation generation photovoltaic devices according to claim 1, which is characterized in that sliding panel is set on (21)
It sets sliding part (26), the sliding slot (25) matched with sliding part (26) is arranged in fixing piece (1) inner wall, and sliding part (26) is slidably connected
Fixing piece (1).
4. a kind of power supply dislocation generation photovoltaic devices according to claim 1, which is characterized in that fixing piece (1) is internal
It is arranged multiple fixed links (22), fixed link (22) is vertically arranged, and fixed link (22) connection fixture (1).
5. a kind of power supply dislocation generation photovoltaic devices according to claim 4, which is characterized in that sliding panel (21) sliding
It is connected and fixed bar (22).
6. a kind of power supply dislocation generation photovoltaic devices according to claim 4, which is characterized in that fixed link covers on (22)
Connect elastic component (23).
7. a kind of power supply dislocation generation photovoltaic devices according to claim 6, which is characterized in that elastic component (23) is perpendicular
Straight setting, and elastic component (23) top connection sliding panel (21), bottom end connection fixture (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811527960.8A CN109639228B (en) | 2018-12-13 | 2018-12-13 | Power supply is with removing power generation photovoltaic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811527960.8A CN109639228B (en) | 2018-12-13 | 2018-12-13 | Power supply is with removing power generation photovoltaic device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109639228A true CN109639228A (en) | 2019-04-16 |
| CN109639228B CN109639228B (en) | 2020-03-31 |
Family
ID=66073818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811527960.8A Active CN109639228B (en) | 2018-12-13 | 2018-12-13 | Power supply is with removing power generation photovoltaic device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109639228B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039417A (en) * | 2020-09-10 | 2020-12-04 | 广州卓邦科技有限公司 | Household small-sized solar thermal power generation equipment |
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| CN207339781U (en) * | 2017-11-03 | 2018-05-08 | 张家口中伏源能源科技有限公司 | A kind of photovoltaic devices with automatical and efficient dedusting function |
| CN207460064U (en) * | 2017-11-16 | 2018-06-05 | 重庆雄光太阳能科技有限公司 | A kind of movable type photovoltaic power generation apparatus |
| CN108336949A (en) * | 2018-04-04 | 2018-07-27 | 杨秀波 | A kind of photovoltaic power generation apparatus easy to remove |
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2018
- 2018-12-13 CN CN201811527960.8A patent/CN109639228B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107505159A (en) * | 2017-08-03 | 2017-12-22 | 深圳市中科智诚科技有限公司 | A kind of soil collection robot of the efficient operation with solar power generation |
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| CN207460064U (en) * | 2017-11-16 | 2018-06-05 | 重庆雄光太阳能科技有限公司 | A kind of movable type photovoltaic power generation apparatus |
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| CN112039417A (en) * | 2020-09-10 | 2020-12-04 | 广州卓邦科技有限公司 | Household small-sized solar thermal power generation equipment |
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| Publication number | Publication date |
|---|---|
| CN109639228B (en) | 2020-03-31 |
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Effective date of registration: 20201110 Address after: 100027 Beijing, Chaoyangmen, North Street, No. 22, No. Patentee after: China Petroleum & Chemical Corp. Patentee after: ELECTRIC POWER BRANCH, SINOPEC GROUP SHENGLI PETROLEUM ADMINISTRATION Co.,Ltd. Address before: 257000 electric building, Zibo Road, Dongying District, Shandong, Dongying Patentee before: ELECTRIC POWER BRANCH, SINOPEC GROUP SHENGLI PETROLEUM ADMINISTRATION Co.,Ltd. |