CN204921152U - Compression ratio adjustable rotary engine - Google Patents
Compression ratio adjustable rotary engine Download PDFInfo
- Publication number
- CN204921152U CN204921152U CN201520451497.9U CN201520451497U CN204921152U CN 204921152 U CN204921152 U CN 204921152U CN 201520451497 U CN201520451497 U CN 201520451497U CN 204921152 U CN204921152 U CN 204921152U
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- China
- Prior art keywords
- blade
- rotor
- air
- cylinder
- acting
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- 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.)
- Withdrawn - After Issue
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The utility model discloses a compression ratio adjustable rotary engine, include: the casing has cylindrical inner chamber, has air inlet, gas vent and is equipped with the fuel import of fuel nozzle, the casing inner chamber is located to the rotor, rotary seal between both ends and casing, and the rotor both sides have the recess that forms air cylinder and acting jar respectively, and form mutually independent air cylinder and acting jar between the casing, and the air inlet corresponds the air cylinder, and the gas vent corresponds the acting jar, the transmission shaft, axis and rotor axis coincidence for output power, at least two sets of roll blade, telescopically locates between casing and the rotor, and every group is by the acting roll blade and the roll blades that calms the anger, rotate when the rotor, the combustion chamber that air cylinder intrinsic qi integument was calmed the anger between roll blade compression to do work roll blade and casing forms high -pressure gas, spouts detonation behind the fuel, and the inflation promotes the rotor and rotates and do work rapidly in the acting jar. The utility model discloses but the compression ratio is big and the adjust the cylinder air input, the corresponding change of compression ratio when the air input changes.
Description
Technical field
The utility model relates to technical field of engines, particularly relates to the rotary engine that a kind of compression ratio is adjustable.
Background technique
Rotary engine has the little and lightweight advantage of volume.Rotary engine is also better than Reciprocating engine in running quietness and stationarity two in addition.But existing rotary engine compression ratio is little, can only Spark ignition type be used, can not with compression-ignited.And all there are hard defects with lubrication in sealing.Power output shaft location comparison is high, makes arrangement arrange inconvenience.In addition, existing rotary engine manufacturing technology is high, and cost compare is expensive, Difficulty.
Model utility content
In view of this, the rotary engine that the utility model provides a kind of compression ratio adjustable, main purpose is to provide the large and rotary engine of adjustable cylinder intake air quantity and compression ratio of a kind of compression ratio.
For achieving the above object, the utility model mainly provides following technological scheme:
On the one hand, the utility model embodiment provides the adjustable rotary engine of a kind of compression ratio, comprising:
Housing, has cylindrical cavity, described housing has suction port, relief opening and fuel inlet, is provided with fuel nozzle in described fuel inlet;
Rotor, be located in the inner chamber of housing, rotary seal between the two ends of described rotor and housing, the both sides of described rotor have the groove forming air cylinder and acting cylinder respectively, and form separate air cylinder between housing and the cylinder that does work, described acting cylinder and air cylinder lay respectively at the both sides of rotor, and described acting cylinder and described air cylinder stagger in the axial direction, the corresponding air cylinder of suction port, relief opening correspondence acting cylinder;
Transmission shaft, axis overlaps with rotor axis, for outputting power;
Rolling blade, is at least two groups, and telescopically is located between housing and rotor, often group by
Acting rolling blade and rolling blade composition of calming the anger; When in rotor turns process, when air cylinder is positioned at rolling blade side, rolling blade of calming the anger wherein is in extended configuration, contact with the Internal periphery of air cylinder and seal, thus the gas in air cylinder is compressed to opposite side from side, air enters in air cylinder from suction port under the effect of negative pressure simultaneously; Now, the rolling blade that does work is restricted and is in contraction state;
When rolling compression blade is between air cylinder and acting cylinder, rolling blade of calming the anger all is in contraction state with acting rolling blade, the firing chamber that gas is compressed between acting rolling blade and housing forms pressurized gas, fuel oil sprays into and pressurized gas mixing detonation through fuel nozzle, now, acting rolling blade is in extended configuration, and pressurized gas undergoes rapid expansion drive rotor in acting cylinder rotates acting;
When the cylinder that does work is positioned at rolling blade side, housing contacts with the cylindrical profile of rotor and seals, thus is discharged from relief opening by the gas in acting cylinder.
As preferably, described rolling compression blade comprise one end be plugged in housing and can radially swinging, telescopic blade and be located at the roll shaft of the blade the other end, the end of described blade forms roll shaft containing groove, and described roll shaft is located in described roll shaft containing groove.
As preferably, the inner peripheral surface of described housing is cylindrical, described housing has blade slot, and one end of described blade is plugged in described blade slot, and the groove of described rotor is divided into air cylinder and acting cylinder by described housing.
As preferably, be formed with oil chamber between described housing and rolling blade, form cavity when described rolling blade stretches out, suck lubricant oil, compaction cavum removal of lubricant during described rolling blades retracted, oil inlet pipe and oil outlet tube are equipped with one-way valve.
As preferably, described rolling blade interior is provided with oil circuit in blade.
As preferably, one end of described housing has cooling air import and cooling air outlet, there is in described housing passage air-cooled with the annular of cooling air inlet communication, also there is in described housing laterally air-cooled passage, the air-cooled passage end of described transverse direction is communicated with annular air-cooled passage, the other end is communicated with the air-cooled junction chamber between rotor tip and housing, there is in described rotor axial air-cooled passage, described two ends of rotor is provided with flabellum, the other end of the air-cooled passage in described rotor is communicated with the annular connectivity slot of shell end, and described annular connectivity slot is communicated with cooling air outlet.
As preferably, described air cylinder is crossing in the axial direction with acting cylinder, adds intake valve and exhaust valve, described intake valve and exhaust valve respectively with calm the anger blade with do work blade integrator, link in work.
As preferably, the inner chamber ovalize of described housing, oval-shaped shell is separated into air cylinder and acting cylinder by rotor, and rotor has blade slot, one end of blade is plugged in described blade slot, and blade relies on centrifugal force when rotating to stretch out.
As preferably, the other diverse location of described shell air inlet has cylinder intake air quantity adjustment hole, and described cylinder intake air quantity adjustment hole is equipped with solenoid valve, opens and closes the adjustable cylinder intake air quantity size of solenoid valve, and regulates compression ratio size simultaneously.
Compared with prior art, the beneficial effects of the utility model are:
The rotary engine compression ratio that the utility model embodiment proposes is large, and adjustable air inflow size, adjustable compression ratio size, can adopt compression ignite mode.And lubrication and sealing are resolved.
Accompanying drawing explanation
Figure 1A and Figure 1B is the structural drawing of the rotary engine of the utility model embodiment, and wherein Figure 1A is the sectional arrangement drawing of rotary engine, and Figure 1B is the structural blast figure of rotary engine;
Fig. 2 is the vertical profile structural representation of the rotary engine of the utility model embodiment;
Fig. 3 is the cross-sectional structural representation of the rotary engine of the utility model embodiment;
Fig. 4 A to Fig. 4 F is the working principle schematic diagram of the working principle of calming the anger of the rotary engine that the utility model embodiment is shown, wherein Fig. 4 B to Fig. 4 F is that air inlet is to having compressed schematic diagram;
Fig. 5 A to Fig. 5 F is the working principle schematic diagram of the acting working principle of the rotary engine that the utility model embodiment is shown, wherein Fig. 5 A is rotary engine schematic cross section, and Fig. 5 B is rotary engine longitudinal section schematic diagram; Fig. 5 C to Fig. 5 F is acting process schematic;
Fig. 6 A to Fig. 6 G is the lubrication system schematic diagram of the rotary engine of the utility model embodiment, wherein Fig. 6 A to Fig. 6 C illustrates lubrication system works process, Fig. 6 D is rotary engine generalized section, Fig. 6 E is acting blade section schematic diagram, Fig. 6 F is lubricating oil path schematic diagram in acting blade, and Fig. 6 G is acting blade schematic diagram;
Fig. 7 A to Fig. 7 C is the air cooling system schematic diagram of the rotary engine of the utility model embodiment, and wherein Fig. 7 A is the structural blast figure of rotary engine, Fig. 7 B is the schematic cross section that air-cooled passage is shown, Fig. 7 C is the elevational schematic that air-cooled passage is shown;
Fig. 8 A to Fig. 8 C is the structural representation of the rotary engine of another embodiment of the utility model, and wherein Fig. 8 A is the generalized section of rotary engine, and Fig. 8 B is rotor and rolling blade corresponding relation schematic diagram, and Fig. 8 C is axle side schematic diagram;
Fig. 9 is the structural representation of the rotary engine of the another embodiment of the utility model.
Description of reference numerals
E-rotary engine; A-stator; B-stator; C-stator; 2-front cover; 3-front end; 4-transmission shaft; 5-acting rolling blade; 5a-does work blade; 5b-does work roll shaft; 6,8-flabellum; 7-rotor; 9-calms the anger rolling blade; 9a-calms the anger blade; 9b calms the anger beaming roller; 10-rear end; 11-rear end cover; 12-bearing; 13-fuel nozzle; 14a-rotor cooling duct; 14b-front cover cooling duct; 14c-stator cooling duct; 14d-rear end cover cooling duct; 15-roll shaft containing groove; 16-relief opening; 17-suction port; 18-cooling air outlet; The import of 19-cooling air; 20-firing chamber; 21-does work cylinder; 22-air cylinder; 23-return tube; Oil circuit in 24-blade; 25-oil chamber; 26-blade groove; 27-spring; 28-is equipped with the cylinder intake air quantity adjustment hole of solenoid valve.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but not as to restriction of the present utility model.In the following description, the not necessarily same embodiment that different " embodiment " or " embodiment " refers to.In addition, special characteristic, structure or feature in one or more embodiment can be combined by any suitable form.
Rotary engine, comprising:
Housing, has round cavity, described housing has suction port, relief opening and fuel inlet, is provided with fuel nozzle in described fuel inlet;
Rotor, be located in the inner chamber of housing, rotary seal between the two ends of described rotor and housing, the both sides of rotor have the groove forming air cylinder and acting cylinder respectively, and form separate air cylinder between housing and the cylinder that does work, described acting cylinder and described air cylinder lay respectively at the both sides of rotor, and described acting cylinder and described air cylinder stagger in the axial direction, the corresponding air cylinder of described suction port, described relief opening correspondence acting cylinder;
Transmission shaft, axis overlaps with rotor axis, for outputting power;
Rolling blade, is at least two groups, and telescopically is located between housing and rotor, and often group is made up of with rolling blade of calming the anger the rolling blade that does work; Acting rolling blade and rolling blade of calming the anger be corresponding acting cylinder and air cylinder respectively, when in rotor turns process, when air cylinder is positioned at rolling blade side, rolling blade of calming the anger wherein is in extended configuration, contact with the Internal periphery of air cylinder and seal, thus the gas in air cylinder is compressed to opposite side from side, air enters in air cylinder from suction port under the effect of negative pressure simultaneously; Now, the rolling blade that does work is restricted and is in contraction state;
When rolling compression blade is between air cylinder and acting cylinder, rolling blade of calming the anger all is in contraction state with acting rolling blade, the firing chamber that gas is compressed between acting rolling blade and housing forms pressurized gas, fuel oil sprays into and pressurized gas mixing detonation through fuel nozzle, now, acting rolling blade is in extended configuration, and pressurized gas undergoes rapid expansion drive rotor in acting cylinder rotates acting;
When the cylinder that does work is positioned at rolling blade side, housing contacts with the cylindrical profile of rotor and seals, thus is discharged from relief opening by the gas in acting cylinder.
In rotary engine of the present utility model, rolling compression blade comprise one end be plugged in housing and can radially swinging, telescopic blade and be located at the roll shaft of the blade the other end, the end of described blade forms roll shaft containing groove, and described roll shaft is located in described roll shaft containing groove.
Be described in detail for the working principle of two groups of rolling blades to rotary engine of the present utility model below.As shown in Figure 1A ~ Fig. 7 C, the inner peripheral surface of the present embodiment middle shell is cylindrical, housing has blade slot, one end of blade is plugged in described blade slot, the both sides of rotor have the groove forming air cylinder and acting cylinder respectively, and the groove of rotor is divided into air cylinder and acting cylinder by described housing.
The present embodiment middle shell is by stator A, stator B, stator C and front end 3 and rear end 10 are formed, the circular in cross-section of the inner chamber of stator, the both sides of rotor 7 have the groove forming air cylinder 22 and acting cylinder 21 respectively, therefore, rotor 7 is divided into two chambers by divided stator, be respectively air cylinder 22 and acting cylinder 21, two each selfsealings of chamber, and stagger on spatial position, stator is provided with four blade grooves, load two groups of rolling blades 5, 9, rolling blade 5, 9 roll shafts comprising blade and blade tip, often organize rolling blade by function called after acting rolling blade 5 and rolling blade 9 of calming the anger respectively, the blade called after of calming the anger in rolling blade 9 is calmed the anger blade 9a, roll shaft called after is calmed the anger roll shaft 9b, represent with rolling blade 9 of calming the anger in the accompanying drawings, blade called after acting blade 5a in acting rolling blade 5, roll shaft called after acting roll shaft 5b, represent with acting rolling blade 5 in the accompanying drawings.The implication of the blade in the utility model comprises calm the anger blade and acting blade, and the implication of roll shaft comprises calm the anger roll shaft and acting roll shaft.Often group is made up of with acting rolling blade 5 rolling blade 9 of calming the anger, when air cylinder 22 inhale fresh air when turning to suction port 16, when air cylinder 22 turn to wherein one group time, because air cylinder 22 and acting cylinder 21 spatially stagger front and back, the rolling blade 9 of calming the anger of corresponding air cylinder is only had to obtain protrusions space, start the work of calming the anger, acting rolling blade 5 does not have protrusions space, suppressed by the profile of rotor circular portion, be in state of dormancy, when end of a period of calming the anger, pressurized gas are in the firing chamber 20 that this group blade and the confined space that forms of stator are formed, the gas temperature that compression ends reaches more than 900 degree, fuel oil is sprayed into through fuel direct injection mouth, start detonation acting, at this moment the acting rolling blade 5 of corresponding acting cylinder obtains protrusions space, stretch into acting cylinder, pressurized gas drive rotor rotates, rolling blade 9 of calming the anger does not have protrusions space, suppressed by the profile of rotor circular portion, be in state of dormancy, the waste gas done work last time because of the separation of acting rolling blade 5 when acting cylinder 21 rotates is released through relief opening 17, once calm the anger and to complete with acting.Two groups of blade alternate work, often enclose often to organize and calm the anger and do work once, go round and begin again and form circulation.
Rolling blade 5,9 is made up of blade 5a, 9a and roll shaft 5b, 9b, loading is located in the blade groove 26 on stator, during work and rotor 7 form rolling friction, oil circuit 24 in hollow blade is provided with in blade, machine oil lubricates and cooled blade and roll shaft by oil circuit in blade 24, blade stretches out power and is made up of spring 27 and air pressure, make roll shaft operationally be close to rotor to roll always, when blade stretches out, suck lubricant oil, during blades withdraw, the lubricant oil in oil circuit in blade 24 is extruded, reach the oil cooled object of lubrication.Structure deformation is taked to seal between rolling blade 5,9 and rotor 7, rolling blade 5,9 in motion and between the surface of contact of rotor 7 because manufacturing tolerance can make rolling blade 5,9 swing to carry out making up adjustment by the contraction of the sealing shell fragment between seal groove and blade, make roll shaft be close to rotor 7 all the time and roll to seal.Rolling blade 5,9 two end faces and front and rear cover 2,11 take clearance type and labyrinth sealing.Take clearance type and thread seal between rotor and stator contact portion, rotor end-face and disc are provided with several groups of screw threads, utilize rotor high-speed to rotarily drive the leakage of screw thread barrier gas.The clearance plane in the middle of two screw threads is wherein utilized to form the sealing gland face of rigidity.Rotor 7 and front cover 2, rear end cover 11 take clearance type and thread seal.Thread seal is taked to isolate between air cylinder 21 and acting cylinder 22.Rear end cover 11 is provided with cooling air import 19, cold wind enters the cooling duct 14a of rotor through the cooling duct 14d of rear end cover, again by the cooling duct 14c going to stator in front cover cooling duct 14b, because rotor cooling duct 14a is provided with flabellum 6,8, wind is drained into rear end cover cooling duct 14d, discharge through cooling air outlet 18.
Fig. 8 A to Fig. 8 C is as another embodiment of rotary engine of the present utility model, be that air cylinder is crossing in the axial direction with acting cylinder with the difference of above embodiment, thus the yardstick of motor is decreased, also because air cylinder is crossing in the axial direction with acting cylinder, suction port and relief opening are across between air cylinder and acting cylinder, can cause and collaborate, so add intake valve and exhaust valve, intake valve and exhaust valve respectively with calm the anger blade and to do work blade integrator, link in work, other structures are all applicable to the present embodiment, and working principle is identical with above embodiment.
With the difference of above embodiment, Fig. 9, as the another embodiment of rotary engine of the present utility model, is only that rolling compression blade is located on rotor, other structures are all applicable to the present embodiment, and working principle is identical with above embodiment.Now, the inner chamber ovalize of housing, oval-shaped shell is separated into air cylinder and acting cylinder by rotor, and rotor has blade slot, one end of blade is plugged in described blade slot, and blade relies on centrifugal force when rotating to stretch out.
The above; be only embodiment of the present utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; change can be expected easily or replace, all should be encompassed within protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of described claim.
Claims (9)
1. the rotary engine that compression ratio is adjustable, is characterized in that, comprising:
Housing, has round cavity, described housing has suction port, relief opening and fuel inlet, is provided with fuel nozzle in described fuel inlet;
Rotor, be located in the inner chamber of housing, rotary seal between the two ends of described rotor and housing, the both sides of rotor have the groove forming air cylinder and acting cylinder respectively, and form separate air cylinder between housing and the cylinder that does work, described acting cylinder and described air cylinder lay respectively at the both sides of rotor, and described acting cylinder and described air cylinder stagger in the axial direction, the corresponding air cylinder of described suction port, described relief opening correspondence acting cylinder;
Transmission shaft, axis overlaps with rotor axis, for outputting power;
Rolling blade, is at least two groups, and telescopically is located between housing and rotor, and often group is made up of with rolling blade of calming the anger the rolling blade that does work; When in rotor turns process, when air cylinder is positioned at rolling blade side, rolling blade of calming the anger wherein is in extended configuration, contact with the Internal periphery of air cylinder and seal, thus the gas in air cylinder is compressed to opposite side from side, air enters in air cylinder from suction port under the effect of negative pressure simultaneously; Now, the rolling blade that does work is restricted and is in contraction state;
When rolling compression blade is between air cylinder and acting cylinder, rolling blade of calming the anger all is in contraction state with acting rolling blade, the firing chamber that gas is compressed between acting rolling blade and housing forms pressurized gas, fuel oil sprays into and pressurized gas mixing detonation through fuel nozzle, now, acting rolling blade is in extended configuration, and pressurized gas undergoes rapid expansion drive rotor in acting cylinder rotates acting;
When the cylinder that does work is positioned at rolling blade side, housing contacts with the cylindrical profile of rotor and seals, thus is discharged from relief opening by the gas in acting cylinder.
2. rotary engine according to claim 1, it is characterized in that, described rolling blade comprise one end be plugged in housing and can radially swinging, telescopic blade and be located at the roll shaft of the blade the other end, the end of described blade forms roll shaft containing groove, and described roll shaft is located in described roll shaft containing groove.
3. rotary engine according to claim 2, it is characterized in that, the inner peripheral surface of described housing is cylindrical, described housing has blade slot, one end of described blade is plugged in described blade slot, and the groove of described rotor is divided into air cylinder and acting cylinder by described housing.
4. rotary engine according to claim 3, is characterized in that, is formed with oil chamber between described housing and rolling blade, forms cavity when described rolling blade stretches out, and sucks lubricant oil, compaction cavum removal of lubricant during described rolling blades retracted.
5. rotary engine according to claim 4, is characterized in that, described rolling blade interior is provided with oil circuit in blade.
6. rotary engine according to claim 1, it is characterized in that, one end of described housing has cooling air import and cooling air outlet, there is in described housing passage air-cooled with the annular of cooling air inlet communication, also there is in described housing laterally air-cooled passage, the air-cooled passage end of described transverse direction is communicated with annular air-cooled passage, the other end is communicated with the air-cooled junction chamber between rotor tip and housing, there is in described rotor axial air-cooled passage, described two ends of rotor is provided with flabellum, the other end of the air-cooled passage in described rotor is communicated with the annular connectivity slot of shell end, described annular connectivity slot is communicated with cooling air outlet.
7. rotary engine according to claim 1, it is characterized in that, the other diverse location of described shell air inlet has cylinder intake air quantity adjustment hole, and described cylinder intake air quantity adjustment hole is equipped with solenoid valve, open and close the adjustable cylinder intake air quantity size of solenoid valve, and regulate compression ratio size simultaneously.
8. rotary engine according to claim 3, is characterized in that, air cylinder is crossing in the axial direction with acting cylinder, adds intake valve and exhaust valve, intake valve and exhaust valve respectively with calm the anger blade with to do work blade integrator, link in work.
9. rotary engine according to claim 2, is characterized in that, the inner chamber ovalize of housing, oval-shaped shell is separated into air cylinder and acting cylinder by rotor, rotor has blade slot, one end of blade is plugged in described blade slot, and blade relies on centrifugal force when rotating to stretch out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520451497.9U CN204921152U (en) | 2015-06-29 | 2015-06-29 | Compression ratio adjustable rotary engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520451497.9U CN204921152U (en) | 2015-06-29 | 2015-06-29 | Compression ratio adjustable rotary engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204921152U true CN204921152U (en) | 2015-12-30 |
Family
ID=54970288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520451497.9U Withdrawn - After Issue CN204921152U (en) | 2015-06-29 | 2015-06-29 | Compression ratio adjustable rotary engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204921152U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104929762A (en) * | 2015-06-29 | 2015-09-23 | 蔡勇 | Rotary engine having adjustable compression ratio |
| CN113482766A (en) * | 2021-07-13 | 2021-10-08 | 李炳强 | Rotor mechanism and vane rotary engine |
-
2015
- 2015-06-29 CN CN201520451497.9U patent/CN204921152U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104929762A (en) * | 2015-06-29 | 2015-09-23 | 蔡勇 | Rotary engine having adjustable compression ratio |
| CN113482766A (en) * | 2021-07-13 | 2021-10-08 | 李炳强 | Rotor mechanism and vane rotary engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151230 Effective date of abandoning: 20170704 |