CN201731111U - Pipeline operation equipment and by-pass valve thereof - Google Patents
Pipeline operation equipment and by-pass valve thereof Download PDFInfo
- Publication number
- CN201731111U CN201731111U CN2010202128327U CN201020212832U CN201731111U CN 201731111 U CN201731111 U CN 201731111U CN 2010202128327 U CN2010202128327 U CN 2010202128327U CN 201020212832 U CN201020212832 U CN 201020212832U CN 201731111 U CN201731111 U CN 201731111U
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- rotating cylinder
- rotaring tube
- bypass valve
- end wall
- outer rotaring
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- Expired - Fee Related
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Abstract
The utility model provides a pipeline operation equipment and a by-pass valve thereof, wherein, the by-pass valve comprises an outer roller which is provided with a plurality of outer notches, and an inner roller which is pivoted in the outer roller and provided with a plurality of inner notches; an effusion passage is formed by the relative rotation of the outer roller and the inner roller when the outer notches are abutted with the inner notches, and the effusion passage is closed when the outer notches are completely staggered with the inner notches. The by-pass valve in the utility model is operated not by the pressure difference of the fluid in the pipeline and not affected by the pressure difference and the pressure fluctuation of the fluid and is capable of controlling the fluid flow quickly and precisely, thereby the speed of the pipeline operation equipment is controlled in an ideal preset range and the pipeline operation equipment is ensured to run stably; the control process is very simple.
Description
Technical field
The utility model is relevant for the equipment that is used for the fluid motion occasion, especially about a kind of pipeline operations device and bypass valve thereof.
Background technique
Bypass valve is widely used in the occasion of various fluid motions, is used for realizing functions such as bypass, step-down and speed governing.But for example on the bypass valve pipe laying working equipment, be used for regulating the speed of in pipeline, advancing with the controlling plumbing fixtures working equipment.Common pipeline operations equipment for example comprises wiper, flux leakage detector and pipeline robot etc.Wherein:
Wiper is used for clearing up pipeline.Flux leakage detector detects the potential risks such as distortion, corrosion of pipeline by its electronic component, find in advance and handle, and causes major accident to prevent these potential risks in the future.Pipeline robot is to carry for example operation equipment such as ccd video camera position and attitude transducer, ultrasonic sensor, vortex sensor, pipeline cleaning device, pipe joint soldering installation, anti-corrosion spray device of multiple sensors and operation equipment on the basis of wiper, the function that has possessed wiper and flux leakage detector can realize more complicated pipeline operations.
At present, except self-powered pipeline robot, almost all the pipeline operations equipment pressure reduction that all relies on the equipment rear and front end (pipeline operations is equipped the hydrodynamic pressure of upstream of rear end greater than the fluid downstream pressure of front end usually as the power that advances, thereby form by after promote the power resources of pipeline operations equipment forward), but pressure reduction can fluctuate along with the variation in pressure of upstream and downstream, thereby can cause that pipeline operations equipment gait of march fluctuates, instability; And current increasing line transportation trends towards the characteristics that flow is big, pressure is high, flow velocity is fast, can cause the excessive velocities of carrying out of pipeline operations equipment.The pipeline operations equipment carries out excessive velocities and instability, can produce following deficiency:
One, the operation effectiveness of pipeline operations equipment expection is undesirable.With regard to wiper, it is particularly evident in gas pipeline that this point is not enough, and too high speed makes the upstream and downstream of wiper that serious blowby phenomenon (bypass) take place, and fluid can not be removed fully.And the electronic component of sensor of installing in the flux leakage detector and so on, when making detection, need the certain reaction time, when flux leakage detector when motion speed is too fast in pipeline, these electronic components also have little time to make a response and have just passed through the fault point, also just can not successfully detect the potential risk of pipeline, have a strong impact on the effect of Magnetic Flux Leakage Inspecting.For pipeline robot, can't get a desired effect too.
Two, the pipeline that the pipeline operations equipment is walked has injury.The inwall of pipeline has drag reduction or corrosion-inhibiting coating, and the strong friction of pipeline operations equipment drive mechanical admixture (grains of sand) meeting generation of carrying out at a high speed and vibrating can destroy coating.If coating is suffered extensive damage, can increase pipe friction, produce corrosion, reduce the life-span of pipeline.
Three, dangerous to operating.Become the heavy pipeline operations equipment of ton can produce huge momentum, will produce huge impact, may break equipment or pipeline operations equipment self, accidents caused hidden danger is arranged elbow, logical ball indicator, ball collecting chamber etc. with the speed operation of tens meters of per seconds.
As seen, the gait of march of controlling plumbing fixtures working equipment and stability are that the research pipeline operations is equipped requisite problem.Current people mainly adopt and bypass valve is installed in pipeline operations equipment is realized control to speed and stability, and a kind of more common bypass valve includes shell and is located at the interior cylinder of shell, and cylinder is made up of cylinder sleeve and piston.Wherein, form the earial drainage gap between the internal surface of the front-end face of cylinder sleeve and shell antetheca, what piston slided is located in the cylinder sleeve, and piston is the closed hollow tube, and the inside body of can ventilating is as the cylinder ante-chamber.Cylinder sleeve is fixing in the enclosure, and the ear end face of piston and cylinder sleeve form the cylinder back cavity of another sealing.When piston slided before and after in cylinder sleeve, the outer wall of piston will block the earial drainage gap, and piston stops at different positions, just can form different big or small cascading water gaps, can realize flow control by seesawing of piston like this.The working principle of this bypass valve is by three two three-way electromagnetic valves, switches the fluid that feeds in ante-chamber and back cavity.When the fluid of ante-chamber introducing front end downstream low pressure, when back cavity is introduced the fluid of upstream, rear end high pressure, the back cavity fluid can promote piston forward and move, and lives the cascading water gap by piston closes, stops cascading water; When fluid, the back cavity of ante-chamber introducing upstream, rear end high pressure were introduced the fluid of front end downstream low pressure, the ante-chamber fluid can compress the back cavity fluid and piston is moved backward, and open fully in the cascading water gap, the beginning cascading water.Though this bypass valve can be regulated speed, but there is following deficiency:
One, this kind bypass valve needs to switch upstream extremity and downstream fluid feeding ante-chamber or back cavity by electromagnetic valve when work, promotes the change that piston action realizes the cascading water gap length by fluid pressure differential again, the control relative complex.
Two, this kind bypass valve still relies on the pressure reduction of upstream and downstream in the pipeline to realize Flow-rate adjustment when work, and working procedure can be subjected to the influence and the constraint of upstream and downstream pressure reduction in the pipeline, when pressure reduction hour, piston action is slower, can't realize regulating fast, and action lags behind, and when pressure reduction is zero, piston will have no idea to move, and therefore in the practice process, often need to coordinate and control the fluid pressure difference of upstream and downstream, that realizes expecting carries out speed, operation difficult; And because fluid has pressure surge, piston as requested accurate movement to appointed positions, even move to appointed positions, piston also can be with pressure surge generation micro displacement, piston can't accurately keep a position to keep the cascading water gap of constant size, the influence that the action of bypass valve is under pressure and fluctuates, control flow rate accurately.
The model utility content
The technical problems to be solved in the utility model provides a kind of pipeline operations equipment and bypass valve thereof, during work, the running of bypass valve does not rely on the pressure difference of pipeline inner fluid, be not subjected to the influence of fluid pressure difference and pressure surge, can realize flow control quickly and accurately, thereby the speed controlling of pipeline operations equipment at desirable prespecified range, operate steadily, and control procedure is very simple.
A kind of bypass valve that the utility model provides comprises:
Outer rotaring tube, described outer rotaring tube forms a plurality of exterior notch;
Interior rotating cylinder is articulated in described outer rotaring tube inside, and described interior rotating cylinder forms a plurality of inner tank mouths;
By relatively rotating of outer rotaring tube and interior rotating cylinder, when exterior notch and inner tank mouths contraposition, form the cascading water passage, and when exterior notch and inner tank mouths stagger fully, described cascading water passage sealing.
In the utility model, described outer rotaring tube is made of with a plurality of outer arcuate sheets that are connected with described outer end wall outer end wall, forms a described exterior notch between the adjacent outer arcuate sheet; Rotating cylinder is made of with a plurality of arc sheets that are connected with described inner end wall inner end wall in described, forms a described inner tank mouths between the adjacent arc sheet.
In the utility model, the outer arcuate sheet of described outer rotaring tube equates with the arc sheet quantity of described interior rotating cylinder, curvature equates and evenly distribution along the circumferential direction respectively.
In the utility model, the central angle of described a plurality of outer arcuate sheets equates, the central angle of described a plurality of arc sheets equates that the central angle of described arc sheet is sealed and matched between the outer surface of described interior rotating cylinder and the internal surface of described outer rotaring tube greater than the central angle of exterior notch.
In the utility model, described a plurality of exterior notch extend to the outer end wall of described outer rotaring tube, and described a plurality of inner tank mouths extend to the inner end wall of described interior rotating cylinder.
In the utility model, rotating cylinder is provided with drive-connecting shaft in described, the outer end wall of described outer rotaring tube is provided with bearing support, the other end in the relative outer end wall of described outer rotaring tube is provided with flange plate, on described flange plate, be connected with bearing bracket, center at described bearing bracket is provided with bearing support, and the two ends of described interior rotating cylinder are held axle by two respectively and are articulated in the outer end wall and the bearing support on the bearing bracket of described outer rotaring tube, and described interior rotating cylinder keeps concentric with outer rotaring tube.
In the utility model, be connected with radially-arranged reinforcement gusset respectively between each arc sheet of described interior rotating cylinder and the described pivotal axis.
In the utility model, described flange plate has the conical surface.
The utility model also provides a kind of pipeline operations equipment, comprises the equipment main body, in described equipment main body bypass valve is installed, and described bypass valve comprises:
Outer rotaring tube, described outer rotaring tube forms a plurality of exterior notch;
Interior rotating cylinder is articulated in described outer rotaring tube inside, and described interior rotating cylinder forms a plurality of inner tank mouths;
By relatively rotating of outer rotaring tube and interior rotating cylinder, when exterior notch and inner tank mouths contraposition, form the cascading water passage, and when exterior notch and inner tank mouths stagger fully, described cascading water passage sealing.
In the utility model, described pipeline operations is equipped for wiper, flux leakage detector or pipeline robot.
According to such scheme, the utility model is significant with respect to the effect of existing structure: pipeline operations equipment of the present utility model and bypass valve thereof, when work, do not rely on the pressure difference of pipeline inner fluid fully, be not subjected to the influence of fluid pressure difference and pressure surge, only according to signal instruction, relatively rotate by rotating cylinder and outer rotaring tube in the drive of dynamical elements such as motor, just can change the opening area of cascading water passage at any time, have fast instant during bypass valve work, move accurate characteristic, thereby can be fast, accurately realize flow control, with with the speed controlling of pipeline operations equipment at desirable prespecified range, operate steadily, and bypass valve of the present utility model only needs can carry out current limliting according to relatively rotating of outer rotaring tube in the command control, and control procedure is very simple.
Description of drawings
Fig. 1 is the stereogram of the utility model outer rotaring tube.
Fig. 2 is the stereogram of rotating cylinder in the utility model.
Fig. 3 is the stereogram of the utility model bypass valve when restricted flow passage is opened fully.
Fig. 4 is the stereogram of the utility model bypass valve when restricted flow passage is closed fully.
Fig. 5 is applied to embodiment's schematic representation of wiper for the utility model.
Embodiment
Mode of execution 1
Shown in Fig. 1～4, the utility model provides a kind of bypass valve 100, comprising:
Interior rotating cylinder 2, interior rotating cylinder 2 is made of with a plurality of arc sheets 22 that are connected with inner end wall 21 inner end wall 21, many to forming a plurality of inner tank mouths 23 between the adjacent arc sheet 22, the central angle of the arc sheet 22 of interior rotating cylinder 2 is not less than the central angle of the exterior notch 13 of (promptly equal or be slightly larger than) outer rotaring tube 1, to reach sealing effect, interior rotating cylinder 2 is provided with drive-connecting shaft 24, one end of drive-connecting shaft 24 is connected by the bearing support 17 on the outer end wall 11 of tapered roller bearing for example and outer rotaring tube 1, the other end of drive-connecting shaft 24 is connected with bearing support 16 on the bearing bracket 15 by tapered roller bearing for example, thereby rotating cylinder 2 is articulated in outer rotaring tube 1 inside with one heart in making, when work, outer rotaring tube 1 is maintained static, interior rotating cylinder 2 rotates freely around drive-connecting shaft 24, preferably make the internal diameter of outer rotaring tube 1 more bigger than the external diameter of interior rotating cylinder 2, rotating cylinder 2 can freely rotate and not interfere with outer rotaring tube 1 in guaranteeing, but be sealed and matched between the internal surface of the outer surface of rotating cylinder 2 and outer rotaring tube 1 in making, specifically be to be sealed and matched between the internal surface of outer arcuate sheet 12 of the outer surface of arc sheet 22 of interior rotating cylinder 2 and outer rotaring tube 1, to reach required sealability;
When bypass valve 100 enters working state, by power for example in the driven by motor rotating cylinder 2 relatively rotate with respect to outer rotaring tube 1, as shown in Figure 3, when the arc sheet 22 of rotating cylinder 2 in exterior notch 13 and inner tank mouths 23 contrapositions promptly turns to when overlapping with the outer arcuate sheet 12 of outer rotaring tube 1, form cascading water passage 3, this moment, bypass valve 100 was in full open position, the bypass amount maximum of fluid; As shown in Figure 4, stagger fully promptly when the arc sheet 22 of interior rotating cylinder 1 turns to the exterior notch 13 that covers outer rotaring tube 1 fully in exterior notch 13 and inner tank mouths 23,3 sealings of cascading water passage, this moment, bypass valve 100 was in buttoned-up status, the bypass amount minimum of fluid.Thereby between two bypass limiting values, can be according to different working conditions, by changing the relative position of inside and outside rotating cylinder 2,1, regulate the size of restricted flow passage 3, with the change of realization bypass amount, thereby can realize flow control quickly and accurately, and control procedure is very simple.
Shown in Fig. 1～4, the outer arcuate sheet 12 of outer rotaring tube 1 equates that with the quantity of the arc sheet 22 of interior rotating cylinder 2 (for example being six), curvature equate and evenly distribution along the circumferential direction respectively, can form six equally distributed restricted flow passages 3.Six outer arcuate sheet 12 central angles equate for example to be 30 degree, total central angle of six outer arcuate sheets 12 accounts for half that 360 of whole outer rotaring tube 1 is spent central angles, exterior notch 13 is rectangular, central angle also be 30 the degree, total central angle of six exterior notch 13 account for whole outer rotaring tube 360 the degree central angles second half.Interior rotating cylinder 2 is basic identical with outer rotaring tube 1, the central angle of six arc sheets 22 also equates, inner tank mouths 23 is rectangular, as previously mentioned, for guaranteeing that inside and outside rotating cylinder 2,1 is in that to close dead state lower seal performance fully better, make the central angle of arc sheet 22 be slightly larger than the central angle of the exterior notch 13 of outer rotaring tube 1, the central angle of each arc sheet 22 of rotating cylinder 2 is 32 degree in for example can making, be slightly larger than central angle 30 degree of the exterior notch 13 of outer rotaring tube 1, and the central angle of each inner tank mouths 23 is 28 degree, and sealing is more reliable.Can expect, restricted flow passage 3 is not limited to talk about previously in the utility model six, other quantity also can.
Shown in Fig. 1～4, a plurality of exterior notch 13 of outer rotaring tube 1 also further extend to the outer end wall 11 of outer rotaring tube 1, and just outer end wall 11 is an Openworks shape, and it is the petal-shaped in the center of circle that outer end wall 11 presents with bearing support 17.The inner end wall 21 of rotating cylinder 2 in a plurality of inner tank mouths 23 of interior rotating cylinder 2 also extend to, inner end wall 21 also is Openworks shape, and it is the petal-shaped in the center of circle that inner end wall 21 presents with drive-connecting shaft 24.Make restricted flow passage 3 have unlimited streamlined flow route like this, when fluid flowed into bypass valve 100, the flow direction of fluid can not change, and can not produce flow-disturbing.Can expect that the outer end wall 11 of outer rotaring tube 1 and the inner end wall 21 of interior rotating cylinder 2 can be the planar of non-hollow out, this moment, fluid needed when flowing into bypass valve 100 by flowing into from the restricted flow passage 3 that is positioned at the side.
As shown in Figure 2, be connected with radially-arranged reinforcement gusset 25 respectively between each arc sheet 22 of interior rotating cylinder 2 and the pivotal axis 24, strengthen 25 of gussets and strengthen fixation, prevent 22 distortion of arc sheet.
Shown in Fig. 1,3,4, flange plate 14 has the conical surface 141, and 141 guide functions of the conical surface prevent that fluid from producing vortex phenomenon at this.
Mode of execution 2
As shown in Figure 5, this mode of execution provides a kind of pipeline operations of the bypass valve in the mode of execution 1 100 that comprises to equip for example wiper 10, wiper 10 comprises equipment main body 101, in equipment main body 101, bypass valve 100 is installed, bypass valve 100 is described in detail in mode of execution 1, does not repeat at this.
Under the situation that does not have bypass valve 100, wiper 10 front end and back end pressure reduction fluctuate along with the change in fluid pressure of upstream and downstream, therefore pressured difference also can fluctuate as the speed of the wiper 10 that power advances, and wiper 10 can cause excessive velocities because the fluid pressure difference of upstream and downstream is big.Load onto after the bypass rotary valve 100, when wiper 10 speed are bigger, when promptly wiper 10 front and back pressure reduction were bigger, the restricted flow passage 3 of bypass valve 100 was opened a certain amount of, wiper 10 internal flow bypass earial drainages, and wiper 10 front and back pressure reduction diminish, and speed reduces; Otherwise when wiper 10 speed were less, the restricted flow passage 3 of bypass valve 100 was closed a certain amount of, and wiper 10 inner vent flows reduce, and it is big that front and back pressure reduction becomes, and speed also thereby become big.The size of the restricted flow passage 3 of bypass valve 100 and switch then change by circuit control according to corresponding rate request to be finished, and control is simple, thereby can be with the speed controlling of pipeline operations equipment at desirable prespecified range, and operates steadily.
Can expect that described pipeline operations equipment can also be flux leakage detector or pipeline robot or the like, no longer describes in detail.
The above only is an embodiment of the present utility model, can not limit the scope that the utility model is implemented with this certainly, and all equivalent variations and modifications of doing according to content of the present utility model just should belong to protection domain of the present utility model.
Claims (10)
1. a bypass valve is characterized in that, comprising:
Outer rotaring tube, described outer rotaring tube forms a plurality of exterior notch;
Interior rotating cylinder is articulated in described outer rotaring tube inside, and described interior rotating cylinder forms a plurality of inner tank mouths;
By relatively rotating of outer rotaring tube and interior rotating cylinder, when exterior notch and inner tank mouths contraposition, form the cascading water passage, and when exterior notch and inner tank mouths stagger fully, described cascading water passage sealing.
2. bypass valve according to claim 1 is characterized in that, described outer rotaring tube is made of with a plurality of outer arcuate sheets that are connected with described outer end wall outer end wall, forms a described exterior notch between the adjacent outer arcuate sheet; Rotating cylinder is made of with a plurality of arc sheets that are connected with described inner end wall inner end wall in described, forms a described inner tank mouths between the adjacent arc sheet.
3. bypass valve according to claim 2 is characterized in that, the outer arcuate sheet of described outer rotaring tube equates with the arc sheet quantity of described interior rotating cylinder, curvature equates and evenly distribution along the circumferential direction respectively.
4. bypass valve according to claim 3, it is characterized in that, the central angle of described a plurality of outer arcuate sheets equates, the central angle of described a plurality of arc sheets equates, the central angle of described arc sheet is sealed and matched between the outer surface of described interior rotating cylinder and the internal surface of described outer rotaring tube greater than the central angle of exterior notch.
5. bypass valve according to claim 3 is characterized in that described a plurality of exterior notch extend to the outer end wall of described outer rotaring tube, and described a plurality of inner tank mouths extend to the inner end wall of described interior rotating cylinder.
6. bypass valve according to claim 2, it is characterized in that, rotating cylinder is provided with drive-connecting shaft in described, the outer end wall of described outer rotaring tube is provided with bearing support, the other end in the relative outer end wall of described outer rotaring tube is provided with flange plate, is connected with bearing bracket on described flange plate, is provided with bearing support at the center of described bearing bracket, the two ends of described interior rotating cylinder are held axle by two respectively and are articulated in the outer end wall and the bearing support on the bearing bracket of described outer rotaring tube, and described interior rotating cylinder keeps concentric with outer rotaring tube.
7. bypass valve according to claim 6 is characterized in that, is connected with radially-arranged reinforcement gusset respectively between each arc sheet of described interior rotating cylinder and the described pivotal axis.
8. bypass valve according to claim 6 is characterized in that described flange plate has the conical surface.
9. a pipeline operations equipment comprises the equipment main body, in described equipment main body bypass valve is installed, and it is characterized in that described bypass valve comprises:
Outer rotaring tube, described outer rotaring tube forms a plurality of exterior notch;
Interior rotating cylinder is articulated in described outer rotaring tube inside, and described interior rotating cylinder forms a plurality of inner tank mouths;
By relatively rotating of outer rotaring tube and interior rotating cylinder, when exterior notch and inner tank mouths contraposition, form the cascading water passage, and when exterior notch and inner tank mouths stagger fully, described cascading water passage sealing.
10. pipeline operations equipment according to claim 9 is characterized in that described pipeline operations is equipped for wiper, flux leakage detector or pipeline robot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202128327U CN201731111U (en) | 2010-05-24 | 2010-05-24 | Pipeline operation equipment and by-pass valve thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202128327U CN201731111U (en) | 2010-05-24 | 2010-05-24 | Pipeline operation equipment and by-pass valve thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201731111U true CN201731111U (en) | 2011-02-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202128327U Expired - Fee Related CN201731111U (en) | 2010-05-24 | 2010-05-24 | Pipeline operation equipment and by-pass valve thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201731111U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102878344A (en) * | 2012-10-29 | 2013-01-16 | 许波 | Pneumatic actuator for angular travel valve |
| CN103042017A (en) * | 2011-10-17 | 2013-04-17 | 中国石油天然气集团公司 | Speed control system actuator for pipeline cleaning and detection device |
| CN103721986A (en) * | 2014-01-02 | 2014-04-16 | 西南石油大学 | Pipe cleaner speed controller with brake pads |
| CN106269734A (en) * | 2016-11-14 | 2017-01-04 | 西南石油大学 | A kind of wiper that there is speed governing step by step and prevent liquid backflow functionality |
-
2010
- 2010-05-24 CN CN2010202128327U patent/CN201731111U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103042017A (en) * | 2011-10-17 | 2013-04-17 | 中国石油天然气集团公司 | Speed control system actuator for pipeline cleaning and detection device |
| CN103042017B (en) * | 2011-10-17 | 2015-06-10 | 中国石油天然气集团公司 | Speed control system actuator for pipeline cleaning and detection device |
| CN102878344A (en) * | 2012-10-29 | 2013-01-16 | 许波 | Pneumatic actuator for angular travel valve |
| CN102878344B (en) * | 2012-10-29 | 2013-12-25 | 许波 | Pneumatic actuator for angular travel valve |
| CN103721986A (en) * | 2014-01-02 | 2014-04-16 | 西南石油大学 | Pipe cleaner speed controller with brake pads |
| CN106269734A (en) * | 2016-11-14 | 2017-01-04 | 西南石油大学 | A kind of wiper that there is speed governing step by step and prevent liquid backflow functionality |
| CN106269734B (en) * | 2016-11-14 | 2018-08-21 | 西南石油大学 | A kind of wiper that there is speed governing step by step and prevent liquid reflux function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110202 Termination date: 20110524 |