CN103671096B - A kind of blade hydraulic pump - Google Patents
A kind of blade hydraulic pump Download PDFInfo
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- CN103671096B CN103671096B CN201310688788.5A CN201310688788A CN103671096B CN 103671096 B CN103671096 B CN 103671096B CN 201310688788 A CN201310688788 A CN 201310688788A CN 103671096 B CN103671096 B CN 103671096B
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- 238000007789 sealing Methods 0.000 claims abstract description 34
- 238000010030 laminating Methods 0.000 claims abstract description 5
- 238000010586 diagram Methods 0.000 description 6
- 238000000605 extraction Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
The invention discloses a kind of high-performance Pump with multiple vane, it comprises housing, rotor, blade, sealing strip and cushion block, rotor is positioned at center, housing is positioned at outside, blade is placed in the hollow ring at housing diagonal angle, also be positioned at the groove of rotor simultaneously, and with rotor at an angle, plane of blade and the frustum cone side of rotor are tangent, sealing strip is between rotor and blade, its plane one side and rotor laminating, round table surface one side is fitted with the round table surface E1 of blade, cushion block be positioned at housing diagonal angle hollow ring, just in time fill up by housing, blade, the vacancy that rotor and sealing strip form. all sealings place of the present invention are face sealing, discharge capacity is large, and pressure is high, and efficiency is high, specific power is large, compact conformation, processing is relatively easy, cost is lower, and the life-span is long.
Description
Technical field
The present invention relates to Pump with multiple vane, relate in particular to a kind of high-performance Pump with multiple vane.
Background technology
Existing vane pump structure is a rotor eccentricity and is placed in cylinder body, blade radial or become certain with rotor radiusAngle is placed in rotor, rotor high-speed rotation when work, and blade throws away under the effect of centrifugal force, forms sealing with cylinder bodyChamber, when rotation, volume-variation produces pressure. . This form vane pump due between blade and cylinder body, be by a contact wire closeEnvelope, therefore sealing property is poor, and output pressure is lower, produces very large friction while adding rotation between blade and rotor and cylinder body,Cause vane pump overall wear fast, the life-span is short, and efficiency is low. In addition, when rotation for ensure blade can be in rotor safety turnover,Rotor must have suitable diameter, and the discharge capacity that is bound to is like this less, although there is Double-blade type hydraulic pump, owing to only having two leavesSheet, flow pulsation is larger, and it is large that flow is also owed.
Summary of the invention
The object of this invention is to provide one and can realize large discharge capacity, flow pulsation is again little, and all sealing place is again faceSealing, and nonabradable high-performance Pump with multiple vane.
In order to achieve the above object, the technical solution used in the present invention is as follows: a kind of high-performance Pump with multiple vane, comprises shellBody, rotor, blade, sealing strip and cushion block, rotor is positioned at center, housing is positioned at outside, blade be placed in housing diagonal angle skyIn heart annulus, be also positioned at the groove of rotor simultaneously, and with rotor at an angle, plane of blade and the round platform of rotorSide is tangent, sealing strip between rotor and blade, the laminating of its plane one side and rotor, round table surface one side is with bladeRound table surface E1 laminating, cushion block be positioned at housing diagonal angle hollow ring, just in time fill up by housing, blade, rotor and sealing stripThe vacancy forming.
In above-mentioned a kind of high-performance Pump with multiple vane, described blade is quadrant shape, has identical four, itsMiddle a slice blade two plane A1, B1 and cylinder C1, sphere D1 and two round table surface E1, J1 enclose and form; Wherein, C1Shi centerFor centre of sphere O1, cylinder that radius is identical with the radius of the cylinder E3 of the hollow ring of housing, D1 is that the centre of sphere is O1 radius and rotorThe sphere that billiard table C2 radius is identical, E1 and J1 are round table surface, the diameter of its upper bottom surface and bottom surface is respectively straight line R1S1 and straightLine M1N1, M1R1 and N1S1 are its side buses; Two plane A1 are parallel with B1; The distance of two parallel plane A1 and B1 is leafThe thickness of sheet, vane thickness equates with the hollow ring width of housing.
Described sealing strip has identical eight, and wherein an E1 side is round table surface, the diameter of its upper bottom surface and bottom surfaceBe respectively straight line R1S1 and P1Q1, P1R1 and N1S1 are its side buses, and K1 side is plane, cross the axis of centre of sphere O1 and put down with thisFace is parallel, and its vertical range is the half of the orthogonal four-bladed vane thickness of slab of rotor, and G1 is that the centre of sphere is O1 radius and rotor center billiard tableThe sphere that C2 radius is equal, F1 is that the centre of sphere is the sphere that O1 radius equals rotor line segment O2M2, two faces of H1 and I1 are parallelPlane, its half long OP1 equates with housing cylinder F3 radius, and width equates with width of blade, and R1 and S1 are faces in two gradients and Fig. 7D3 is for the equal inclined-plane of the gradient of B3, and the width of sealing strip equates with vane thickness; Blade and sealing strip are axial symmetry;
In the middle of described rotor, be the parallel dolioform billiard table that cuts out two spherical crowns in two, in the middle of billiard table, insert one as symmetryOrthogonal four-bladed vane, cydariform billiard table two is two identical hollow round tables, and A2 is parallel disk with B2, and R2 and S2 are alsoParallel disk, C2 and D2 are that the centre of sphere is the sphere of O2, I2 and J2 are orthogonal two planes, blade and two closeStrip of paper used for sealing is vertically placed in the groove between I2 and J2, just in time completely closely sealed, and E2 and F2 are that central shaft is crossed O2 radius and housing postThe cylinder that face F3 radius is identical, G2 and H2 are two identical hollow round table part sides, upper and lower two ends of side round platform, are respectivelyDisk A2 and disk R2, upper and lower two ends of opposite side round platform are respectively disk B2 and disk S2, the straight line segment length of K2M2Degree is the width of rotor, and two frustum cone side G2 and H2 and corresponding housing hollow ring parallel plane C3 and D3 fit, wholeRotor, not only about billiard table center O 2 symmetries, is also axial symmetry;
Described housing is the parallel dolioform sphere that cuts out two spherical crowns in two, and thickness equates with the width K2M2 of rotor,A3 is the parallel disk that two radiuses equate with B3, and F3 is cylinder, and its central shaft is crossed O3, radius and rotor left and right outside E2Equate with the radius of F2 cylinder, the diagonal angle of housing cylinder is a hollow ring, and annulus width equates with vane thickness, hollow ringTwo side C3 be parallel circular planes with D3, E3 be central shaft by the cylinder of O3, be positioned on the diagonal of housing, itsExternal diameter equates with the external diameter of blade cylinder C1, and is greater than the external diameter of housing cylinder F3, the C3 that annulus is parallel and D3 two planes and phaseThe rotor two hollow round table side G2 and the H2 that answer fit, and whole housing is about billiard table center O 3 symmetries;
Described cushion block is one section of annulus, has identical four, and wherein an outside A4 is radius and housing diagonal angle annulusThe cylinder that E3 external diameter is equal, inner side B4 is the sphere that radius equals rotor line segment O2M2, its upper and lower thickness and rotor orthogonal tenLetter stencil width K2M2 is equal, and two waist C4 and D4 are round table surface, and the diameter of this round table surface upper bottom surface and bottom surface is respectively straight lineP1Q1 and M1N1, M1P1 is its side bus, cushion block is shaped as axial symmetry.
The advantage that the present invention has is:
1) all sealings place are face sealing;
2) discharge capacity is large, and pressure is high, and efficiency is high;
3) specific power is large;
4) compact conformation, processing is relatively easy;
5) cost is lower, and the life-span is long.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is blade of the present invention and sealing strip shape schematic diagram; ,
Fig. 2 is the left view of Fig. 1;
Fig. 3 be Fig. 1 S to T to schematic diagram;
Fig. 4 is rotor shapes schematic diagram of the present invention;
Fig. 5 is the W-W generalized section of Fig. 4;
Fig. 6 is the top view of housing of the present invention;
Fig. 7 is the front view of housing of the present invention;
Fig. 8 is the M-M generalized section of Fig. 7;
Fig. 9 is overall structure schematic diagram of the present invention;
Figure 10 is that the K of Fig. 9 is to schematic diagram;
Figure 11 is the N-N generalized section of Fig. 9;
Figure 12 is operation logic schematic diagram of the present invention;
Figure 13 is the U-U generalized section of Fig. 9;
Figure 14 is course of work principle schematic of the present invention;
Figure 15 is the V-V generalized section of Figure 12;
Figure 16 is course of work principle schematic of the present invention.
In figure: 1. housing, 2. rotor, 3. blade, 4. sealing strip, 5 cushion blocks.
Detailed description of the invention
As shown in figure 12, rotor 2 is positioned at center to structure of the present invention, and housing 1 is positioned at outside, and it is right that blade 3 is placed in housing 1In the hollow ring (gathering sill) at angle, be also positioned at the groove of rotor 2 simultaneously, and with rotor 2 at an angle, of blade 3The frustum cone side of plane and rotor 2 is tangent, and sealing strip 4 is between rotor 2 and blade, and its plane one side and rotor 2 are fitted, circleTable top one side is fitted with the round table surface E1 of blade 3, and cushion block 5 is positioned at the hollow ring at housing 1 diagonal angle, just in time fills up by housing1, blade 3, the vacancy that rotor 2 and sealing strip 4 form.
Fig. 1 and the shape that Figure 3 shows that blade 3 of the present invention and sealing strip 4. Blade 3 is quadrant shape or approximateQuadrant shape, has identical four, and wherein a slice blade 3 is by two plane A1, B1 and cylinder C1, sphere D1 and two circlesTable top E1, J1 enclose and form; Wherein, C1Shi center is centre of sphere O1, radius and the radius phase of the cylinder E3 of the hollow ring of housing 1Same cylinder, D1 is that the centre of sphere is the sphere that O1 radius is identical with Fig. 5 rotor 2 billiard table C2 radiuses, E1 and J1 are round table surface, its upper baseThe diameter of face and bottom surface is respectively straight line R1S1 and straight line M1N1, and M1R1 and N1S1 are its side buses; Two plane A1Parallel with B1; The distance of two parallel plane A1 and B1 is the thickness of blade 3, the open circles ring width of blade 3 thickness and Fig. 7 housing 1Degree equates.
Sealing strip 4 has identical eight, and wherein an E1 side is round table surface, and the diameter of its upper bottom surface and bottom surface respectivelyBe straight line R1S1 and P1Q1, P1R1 and N1S1 are its side buses, and K1 side is plane, cross the axis of centre of sphere O1 (as Fig. 1 instituteShow) with this plane parallel, its vertical range is the half of the orthogonal four-bladed vane thickness of slab of Fig. 4 rotor 2, G1 be the centre of sphere be O1 radius withThe equal sphere of Fig. 5 rotor 2 center billiard table C2 radius, F1 is that the centre of sphere is the sphere that O1 radius equals Fig. 4 rotor 2 line segment O2M2,Two faces of H1 and I1 are parallel planes, (its half long OP1 equates with Fig. 7 housing 1 cylinder F3 radius), width and blade 3 widthEquate (inclined-plane that R1 and S1 are two gradients with in Fig. 7, face D3 equates for the gradient of B3). The width of sealing strip 4 (is planeThe distance of H1 and I1) equate with blade 3 thickness; Blade 3 and sealing strip 4 are axial symmetry.
Fig. 4 and the shape that Figure 5 shows that rotor 2 of the present invention. It in the middle of rotor 2, is the parallel waist that cuts out two spherical crowns in twoCydariform billiard table, inserts an orthogonal four-bladed vane as symmetry in the middle of billiard table, and cydariform billiard table two is two identical hollow round tables,A2 is parallel disk with B2, and R2 is also parallel disk with S2, and C2 and D2 are that the centre of sphere is the sphere of O2, and I2 and J2 are phasesTwo vertical planes mutually, by the whole figure of Fig. 1, a blade 3 and two sealing strips 4 are vertically placed between I2 and J2In groove, just in time completely closely sealed, E2 is that central shaft is crossed the cylinder that O2 radius is identical with housing 1 cylinder F3 radius, G2 and H2 with F2Be two identical hollow round table part sides, upper and lower two ends of side round platform are respectively disk A2 and disk R2, opposite sideUpper and lower two ends of round platform are respectively disk B2 and disk S2, and the length of straigh line of K2M2 is the width of rotor 2, two frustum cone sidesThe locus of G2 and H2 is to determine as follows: two frustum cone side G2 and H2 and corresponding housing 1 hollow ring after ensureing to assembleParallel plane C3 and D3 fit, and whole rotor 2, not only about billiard table center O 2 symmetries, is also axial symmetry.
Fig. 6, Fig. 7 and Figure 8 shows that the shape of housing 1 of the present invention. Housing 1 is the parallel waist that cuts out two spherical crowns in twoCydariform sphere, thickness equates with the width K2M2 of rotor 2, and A3 is the parallel disk that two radiuses equate with B3, and F3 is postFace, its central shaft is crossed O3, and radius equates with the radius of E2 outside rotor 2 left and right and F2 cylinder, and the diagonal angle of housing 1 cylinder has beenHeart annulus, annulus width equates with blade 3 thickness, and two side C3 of hollow ring are parallel circular planes with D3, and E3 isCentral shaft, by the cylinder of O3, is positioned on the diagonal of housing 1, and its external diameter equates with the external diameter of blade 3 cylinder C1, and is greater than shellThe external diameter of body 1 cylinder F3, the locus of the C3 that annulus is parallel and D3 two planes is to determine as follows: ensure to assemble rear C3 and D3Two planes fit with corresponding 2 liang of hollow round table side G2 of rotor and H2, and the sphere of K3G3H3 is oil extraction face, the position of G3H3The dull and stereotyped position by Q4 side plane of rotor 2 between chamber Q3 and Q4 in the time that rotor 2 forwards position shown in Figure 14 to, the ball of L3I3J3Face is oil-feed face, and the position of I3J3 is that the rotor 2 between chamber Q4 and Q5 is dull and stereotyped by Q5 side in the time that rotor 2 forwards position shown in Figure 14 toThe position of plane. Whole housing 1 is about billiard table center O 3 symmetries.
5 shapes that are depicted as cushion block 5 of the present invention in Figure 11. Cushion block 5 is one section of annulus, has identical four, whereinArticle one, outside A4 is the cylinder that radius equates with housing 1 diagonal angle annulus E3 external diameter, and inner side B4 is that radius equals Fig. 4 rotor 2 line segmentsThe sphere of O2M2, its upper and lower thickness four-bladed vane width K2M2 orthogonal with rotor 2 equate, two waist C4 and D4 are round table surface, shouldThe diameter of round table surface upper bottom surface and bottom surface be respectively straight line P1Q1 and M1N1(as shown in Figure 1), M1P1 is its side bus,Cushion block 5 is shaped as axial symmetry.
Operation operation principle of the present invention is as follows:
As Figure 14, in one end of vane pump, rotor 2, blade 3, sealing strip 4 and housing 1 are divided into five separately by oil pocketIndependently annular seal space Q1, Q2, Q3, Q4 and Q5.
When rotor 2 is in the time that Figure 13 position turns clockwise, chamber Q2 starts oil suction, and Q3 and Q4 are oil sucting cavity, and Q5 and Q1 are rowOil pocket.
In the time forwarding Figure 14 position to, it is maximum that oil sucting cavity Q4 reaches. At this moment, oil sucting cavity Q2, Q3 and Q4 and oil-discharging cavity Q5 and Q1Still keep isolation. Rotor 2 continues rotation clockwise, and chamber Q4 starts oil extraction, and oil sucting cavity Q2 and Q3 constantly expand, oil-discharging cavity Q5 and Q1Constantly dwindle.
In the time forwarding Figure 15 position to, chamber Q1 oil drains. In the time that rotor 2 continues rotation, new oil sucting cavity starts oil suction, oil suctionChamber Q2 and Q3 are still in continuous expansion, and chamber Q4 and Q5 are still in continuous oil extraction.
In the time that rotor 2 forwards Figure 16 position to, it is maximum that oil sucting cavity Q3 reaches, oil extraction then. When rotor 2 continues to forward to Figure 13 positionWhile putting, chamber Q5 oil drains. In the time that rotor 2 forwards Figure 14 position again to, it is maximum that oil sucting cavity Q2 reaches. So go round and begin again. At bladeThe other end of pump, situation is also identical with this one end.
Above-described embodiment is used for the present invention that explains, instead of this aspect is limited, in spirit of the present invention andIn the protection domain of claim, any amendment and change that this aspect is made, all fall into protection scope of the present invention.
Claims (1)
1. a blade hydraulic pump, is characterized in that, comprises housing (1), rotor (2), blade (3), sealing strip (4) and cushion block(5), rotor (2) is positioned at center, and housing (1) is positioned at outside, blade (3) be placed in housing (1) diagonal angle hollow ring in, withTime be also positioned at the groove of rotor (2), and with rotor (2) at an angle, plane of blade (3) and the round platform of rotor (2)Side is tangent, and sealing strip (4) is positioned between rotor (2) and blade, its plane one side and rotor (2) laminating, and round table surface one side isWith the round table surface E1 laminating of blade (3), cushion block (5) be positioned at housing (1) diagonal angle hollow ring, just in time fill up by housing(1) vacancy that, blade (3), rotor (2) and sealing strip (4) form;
Described blade (3) is quadrant shape, has identical four, wherein a slice blade (3) two plane A1, B1 and postsFace C1, sphere D1 and two round table surface E1, J1 enclose and form; Wherein, C1Shi center is the hollow of centre of sphere O1, radius and housing (1)The identical cylinder of radius of the cylinder E3 of annulus, D1 is that the centre of sphere is the sphere that O1 radius is identical with rotor (2) billiard table C2 radius, E1With J1 be round table surface, the diameter of its upper bottom surface and bottom surface is respectively straight line R1S1 and straight line M1N1, M1R1 and N1S1 are themSide bus; Two plane A1 are parallel with B1; The distance of two parallel plane A1 and B1 is the thickness of blade (3), blade (3) thicknessEquate with the hollow ring width of housing (1);
Described sealing strip (4) has identical eight, and wherein an E1 side is round table surface, and the diameter of its upper bottom surface and bottom surface dividesBe not straight line R1S1 and P1Q1, P1R1 and N1S1 are its side buses, and K1 side is plane, cross the axis of centre of sphere O1 and put down with thisFace is parallel, and its vertical range is the half of the orthogonal four-bladed vane thickness of slab of rotor (2), and G1 is that the centre of sphere is in O1 radius and rotor (2)The equal sphere of bulbus cordis platform C2 radius, F1 is that the centre of sphere is the sphere that O1 radius equals rotor (2) line segment O2M2, two faces of H1 and I1Be parallel plane, its half long OP1 equates with housing (1) cylinder F3 radius, and width equates with blade (3) width, and R1 and S1 areTwo gradients and the inclined-plane that in Fig. 7, face D3 equates for the gradient of B3, the width of sealing strip (4) equates with blade (3) thickness; Blade(3) and sealing strip (4) be axial symmetry;
In the middle of described rotor (2), be the parallel dolioform billiard table that cuts out two spherical crowns in two, in the middle of billiard table, insert one as symmetryOrthogonal four-bladed vane, cydariform billiard table two is two identical hollow round tables, and A2 is parallel disk with B2, and R2 and S2 are alsoParallel disk, C2 and D2 are that the centre of sphere is the sphere of O2, I2 and J2 are orthogonal two planes, a blade (3) and twoBar sealing strip (4) is vertically placed in the groove between I2 and J2, just in time completely closely sealed, and E2 and F2 are that central shaft is crossed O2 radiusThe cylinder identical with housing (1) cylinder F3 radius, G2 and H2 are two identical hollow round table part sides, a side round platform is upper and lowerTwo ends were respectively disk A2 and disk R2, and upper and lower two ends of opposite side round platform are respectively disk B2 and disk S2, K2M2Length of straigh line be the width of rotor (2), two frustum cone side G2 and H2 and corresponding housing (1) hollow ring parallel planeC3 and D3 fit, and whole rotor (2), not only about billiard table center O 2 symmetries, is also axial symmetry;
Described housing (1) is the parallel dolioform sphere that cuts out two spherical crowns in two, the width K2M2 phase of thickness and rotor (2)Deng, A3 is the parallel disk that two radiuses equate with B3, and F3 is cylinder, and its central shaft is crossed O3, radius and rotor (2) left and rightThe radius of outside E2 and F2 cylinder is equal, and the diagonal angle of housing (1) cylinder is a hollow ring, annulus width and blade (3) thicknessEquate, two side C3 of hollow ring are parallel circular planes with D3, E3 be central shaft by the cylinder of O3, be positioned at housing(1), on diagonal, its external diameter equates with the external diameter of blade (3) cylinder C1, and is greater than the external diameter of housing (1) cylinder F3, annulusParallel C3 and D3 two planes fit with corresponding rotor (2) two hollow round table side G2 and H2, and whole housing (1) is about ballPlatform center O 3 symmetries;
Described cushion block (5) is one section of annulus, has identical four, and wherein an outside A4 is radius and housing (1) diagonal angle circleThe equal cylinder of ring E3 external diameter, inner side B4 is the sphere that radius equals rotor (2) line segment O2M2, its upper and lower thickness and rotor (2)Orthogonal four-bladed vane width K2M2 is equal, and two waist C4 and D4 are round table surface, and the diameter of this round table surface upper bottom surface and bottom surface dividesBe not straight line P1Q1 and M1N1, M1P1 is its side bus, and cushion block (5) is shaped as axial symmetry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310688788.5A CN103671096B (en) | 2013-12-16 | 2013-12-16 | A kind of blade hydraulic pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310688788.5A CN103671096B (en) | 2013-12-16 | 2013-12-16 | A kind of blade hydraulic pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103671096A CN103671096A (en) | 2014-03-26 |
| CN103671096B true CN103671096B (en) | 2016-05-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310688788.5A Expired - Fee Related CN103671096B (en) | 2013-12-16 | 2013-12-16 | A kind of blade hydraulic pump |
Country Status (1)
| Country | Link |
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| CN (1) | CN103671096B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109469610B (en) * | 2018-09-28 | 2021-04-06 | 浙江大学 | High performance multiple vane pump |
| CN109236639B (en) * | 2018-09-28 | 2021-04-06 | 浙江大学 | High-pressure large-flow multi-blade pump |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101418795A (en) * | 2008-12-11 | 2009-04-29 | 宁波华液机器制造有限公司 | High performance hydraulic pump |
| CN102536804A (en) * | 2011-12-30 | 2012-07-04 | 浙江大学 | Cylindrical vane hydraulic pump |
| CN102536803A (en) * | 2011-12-30 | 2012-07-04 | 浙江大学 | Shell oil distribution type cylindrical blade hydraulic pump |
| CN102562580A (en) * | 2011-12-30 | 2012-07-11 | 浙江大学 | Spherical vane hydraulic pump with oil discharging on shell |
-
2013
- 2013-12-16 CN CN201310688788.5A patent/CN103671096B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101418795A (en) * | 2008-12-11 | 2009-04-29 | 宁波华液机器制造有限公司 | High performance hydraulic pump |
| CN102536804A (en) * | 2011-12-30 | 2012-07-04 | 浙江大学 | Cylindrical vane hydraulic pump |
| CN102536803A (en) * | 2011-12-30 | 2012-07-04 | 浙江大学 | Shell oil distribution type cylindrical blade hydraulic pump |
| CN102562580A (en) * | 2011-12-30 | 2012-07-11 | 浙江大学 | Spherical vane hydraulic pump with oil discharging on shell |
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| CN103671096A (en) | 2014-03-26 |
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