CN103671096A - Vane type hydraulic pump - Google Patents
Vane type hydraulic pump Download PDFInfo
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- CN103671096A CN103671096A CN201310688788.5A CN201310688788A CN103671096A CN 103671096 A CN103671096 A CN 103671096A CN 201310688788 A CN201310688788 A CN 201310688788A CN 103671096 A CN103671096 A CN 103671096A
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Abstract
The invention discloses a high-performance multi-vane pump which comprises a casing, a rotor, vanes, seal strips and cushion blocks, wherein the rotor is arranged in the center; the casing is arranged at the external part; the vanes are arranged in hollow circular rings at the opposite angles of the casing and also arranged in the grooves of the rotor, and form angles together with the rotor; one plane of each vane is tangent to the circular-truncated-cone side surface of the rotor; the seal strips are arranged between the rotor and the vanes, one side of the plane of each seal strip is fitted with the rotor, and one side of the circular-truncated-cone surface of each seal strip is fitted with the circular-truncated-cone surface E1 of the corresponding vane; the cushion blocks are arranged in the hollow circular rings at the opposite angles of the casing, and gaps formed by the casing, the vanes, the rotor and the seal strips are just filled up with the cushion blocks. All sealed parts adopt face seal; the multi-vane pump is large in discharge capacity, high in pressure, efficiency and specific power, compact in structure, easier to process, lower in cost and long in service life.
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 technique
Existing vane pump structure is a rotor eccentricity and is placed in cylinder body, blade radial or be placed in rotor with rotor radius is angled, rotor high-speed rotation during work, blade throws away under the effect of centrifugal force, form Seal cage with cylinder body, during rotation, volume-variation produces pressure.。This form vane pump is owing to being by the sealing of Line of contact between blade and cylinder body, so sealability is poor, and delivery pressure is lower, while adding rotation, between blade and rotor and cylinder body, produce very large friction, cause vane pump overall wear fast, the life-span is short, and efficiency is low.In addition, during rotation, in order to guarantee that blade can safety pass in and out in rotor, rotor must have suitable diameter, and the discharge capacity that is bound to is like this less, although there is Double-blade type oil hydraulic pump, owing to only having two blades, 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 and a kind ofly can realize large discharge capacity, flow pulsation is again little, and all sealings place are again face sealing, 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, comprise housing, rotor, blade, Stamping Steel Ribbon and cushion block, rotor is positioned at center, housing is positioned at outside, blade be placed in housing diagonal angle hollow ring in, 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, Stamping Steel Ribbon 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 Stamping Steel Ribbon form.
In above-mentioned a kind of high-performance Pump with multiple vane, described blade is quadrant shape, has identical four, and wherein a slice blade two plane A1, B1 and cylinder C1, sphere D1 and two round table surface E1, J1 enclose and form; Wherein, C1Shi center is the cylinder that centre of sphere O1, radius are identical with the radius of the cylinder E3 of the hollow ring of housing, D1 is that the centre of sphere is the sphere that O1 radius is identical with rotor billiard table C2 radius, E1 and J1 are round table surface, the diameter of its upper bottom surface and bottom surface is respectively straight line R1S1 and straight line M1N1, and M1R1 and N1S1 are its side buses; Two plane A1 are parallel with B1; The thickness that the distance of two parallel plane A1 and B1 is blade, vane thickness equates with the hollow ring width of housing.
Described Stamping Steel Ribbon has identical eight, wherein an E1 side is round table surface, the diameter of its upper bottom surface and bottom surface is respectively straight line R1S1 and P1Q1, P1R1 and N1S1 are its side buses, K1 side is plane, cross axis and this plane parallel of centre of sphere O1, its perpendicular distance is half of four-bladed vane thickness of slab of rotor quadrature, G1 is that the centre of sphere is the sphere that O1 radius equates with rotor center billiard table C2 radius, 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 parallel planes, its half long OP1 equates with housing cylinder F3 radius, width equates with width of blade, R1 and the S1 inclined-plane that to be two gradients equate for the gradient of B3 with face D3 in Fig. 7, the width of Stamping Steel Ribbon equates with vane thickness, blade and Stamping Steel Ribbon are axisymmetric,
It in the middle of described rotor, is the parallel dolioform billiard table that cuts out two spherical crowns in two, in the middle of billiard table, as symmetry, insert the four-bladed vane of a quadrature, cydariform billiard table two is two identical hollow round tables, A2 is parallel disk with B2, R2 is also parallel disk with S2, C2 and D2 are that the centre of sphere is the sphere of O2, I2 and J2 are orthogonal two planes, a blade and two Stamping Steel Ribbons are vertically placed in the groove between I2 and J2, just in time completely closely sealed, E2 is that central shaft is crossed the cylinder that O2 radius is identical with housing cylinder F3 radius with F2, G2 and H2 are two identical hollow round table part sides, one upper and lower two ends of side round platform were respectively disk A2 and disk R2, upper and lower two ends of opposite side round platform are respectively disk B2 and disk S2, the length of straigh line of K2M2 is the width of rotor, two frustum cone side G2 and H2 and corresponding housing hollow ring parallel plane C3 and D3 fit, whole rotor is not only about billiard table center O 2 symmetries, also be axisymmetric,
Described housing is the parallel dolioform sphere that cuts out two spherical crowns in two, thickness equates with the width K2M2 of rotor, A3 is the parallel disk that two radiuses equate with B3, F3 is cylinder, its central shaft is crossed O3, radius equates with the radius of rotor left and right outside E2 and F2 cylinder, the diagonal angle of housing cylinder is a hollow ring, annulus width equates with vane thickness, two side C3 of hollow ring are parallel circular planes with D3, E3 is that central shaft is by the cylinder of O3, be positioned on the diagonal of housing, its external diameter equates with the external diameter of blade cylinder C1, and be greater than the external diameter of housing cylinder F3, the C3 that annulus is parallel and D3 two planes fit with corresponding rotor two hollow round table side G2 and H2, whole housing is about billiard table center O 3 symmetries,
Described cushion block is one section of annulus, have identical four, wherein an outside A4 is the cylinder that radius equates with housing diagonal angle annulus E3 external diameter, inner side B4 is the sphere that radius equals rotor line segment O2M2, its upper and lower thickness equates with the four-bladed vane width K2M2 of rotor quadrature, 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 line P1Q1 and M1N1, M1P1 is its side bus, and cushion block is shaped as axisymmetric.
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 structure, processing is relatively easy;
5) cost is lower, and the life-span is long.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is blade of the present invention and Stamping Steel Ribbon 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 plan view of housing of the present invention;
Fig. 7 is the plan 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 running principle schematic diagram of the present invention;
Figure 13 is the U-U generalized section of Fig. 9;
Figure 14 is working procedure principle schematic of the present invention;
Figure 15 is the V-V generalized section of Figure 12;
Figure 16 is working procedure principle schematic of the present invention.
In figure: 1. housing, 2. rotor, 3. blade, 4. Stamping Steel Ribbon, 5 cushion blocks.
Embodiment
Structure of the present invention as shown in figure 12, rotor 2 is positioned at center, housing 1 is positioned at outside, blade 3 is placed in the hollow ring (guiding groove) at housing 1 diagonal angle, also be positioned at the groove of rotor 2 simultaneously, and with rotor 2 at an angle, plane of blade 3 and the frustum cone side of rotor 2 are tangent, Stamping Steel Ribbon 4 is between rotor 2 and blade, and its plane one side and rotor 2 are fitted, and round table surface one side is fitted with the round table surface E1 of blade 3, cushion block 5 is positioned at the hollow ring at housing 1 diagonal angle, just in time fill up by housing 1 blade 3, the vacancy that rotor 2 and Stamping Steel Ribbon 4 form.
Fig. 1 and the shape that Figure 3 shows that blade 3 of the present invention and Stamping Steel Ribbon 4.Blade 3 is quadrant shape or approximate quadrant shape, and total identical four, wherein a slice blade 3 is enclosed and formed by two plane A1, B1 and cylinder C1, sphere D1 and two round table surface E1, J1; Wherein, C1Shi center is the cylinder that centre of sphere O1, radius are identical with the radius of the cylinder E3 of the hollow ring of housing 1, 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, the diameter of its upper bottom surface and bottom surface is respectively straight line R1S1 and straight line M1N1, and M1R1 and N1S1 are its side buses; Two plane A1 are parallel with B1; The distance of two parallel plane A1 and B1 is the thickness of blade 3, and blade 3 thickness equate with the hollow ring width of Fig. 7 housing 1.
Stamping Steel Ribbon 4 has identical eight, wherein an E1 side is round table surface, the diameter of its upper bottom surface and bottom surface is respectively straight line R1S1 and P1Q1, P1R1 and N1S1 are its side buses, K1 side is plane, cross the axis (as shown in Figure 1) and this plane parallel of centre of sphere O1, its perpendicular distance is half of four-bladed vane thickness of slab of Fig. 4 rotor 2 quadratures, G1 is that the centre of sphere is the sphere that O1 radius equates with Fig. 5 rotor 2 center billiard table C2 radiuses, 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 equates with blade 3 width, (R1 and S1 are two gradients for the gradient of B3, equate with face D3 in Fig. 7 inclined-plane).The width of Stamping Steel Ribbon 4 (being the distance of plane H1 and I1) equates with blade 3 thickness; Blade 3 and Stamping Steel Ribbon 4 are axisymmetric.
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 dolioform billiard table that cuts out two spherical crowns in two, in the middle of billiard table, as symmetry, insert the four-bladed vane of a quadrature, cydariform billiard table two is two identical hollow round tables, A2 is parallel disk with B2, R2 is also parallel disk with S2, C2 and D2 are that the centre of sphere is the sphere of O2, I2 and J2 are orthogonal two planes, by the whole figure of Fig. 1, a blade 3 and two Stamping Steel Ribbons 4 are vertically placed in the groove between I2 and J2, 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 with F2, G2 and H2 are two identical hollow round table part sides, one upper and lower two ends of side round platform were respectively disk A2 and disk R2, upper and lower two ends of opposite side round platform are respectively disk B2 and disk S2, the length of straigh line of K2M2 is the width of rotor 2, the spatial position of two frustum cone side G2 and H2 is to determine as follows: after guaranteeing to assemble, two frustum cone side G2 and H2 and corresponding housing 1 hollow ring parallel plane C3 and D3 fit, whole rotor 2 is not only about billiard table center O 2 symmetries, also be axisymmetric.
Fig. 6, Fig. 7 and Figure 8 shows that the shape of housing 1 of the present invention.Housing 1 is the parallel dolioform sphere that cuts out two spherical crowns in two, thickness equates with the width K2M2 of rotor 2, A3 is the parallel disk that two radiuses equate with B3, F3 is cylinder, its central shaft is crossed O3, radius equates with the radius of E2 outside rotor 2 left and right and F2 cylinder, the diagonal angle of housing 1 cylinder is a hollow ring, annulus width equates with blade 3 thickness, two side C3 of hollow ring are parallel circular planes with D3, E3 is that central shaft is by the cylinder of O3, be positioned on the diagonal of housing 1, its external diameter equates with the external diameter of blade 3 cylinder C1, and be greater than the external diameter of housing 1 cylinder F3, the spatial position of the C3 that annulus is parallel and D3 two planes is to determine as follows: guarantee to assemble rear C3 and D3 two planes and fit with corresponding 2 liang of hollow round table side G2 of rotor and H2, the sphere of K3G3H3 is oil extraction face, the position of G3H3 is the dull and stereotyped position by Q4 side plane of the rotor between chamber Q3 and Q4 2 when rotor 2 forwards position shown in Figure 14 to, the sphere of L3I3J3 is oil-feed face, the position of I3J3 is the dull and stereotyped position by Q5 side plane of the rotor between chamber Q4 and Q5 2 when rotor 2 forwards position shown in Figure 14 to.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, have identical four, wherein an outside A4 is the cylinder that radius equates with housing 1 diagonal angle annulus E3 external diameter, inner side B4 is the sphere that radius equals Fig. 4 rotor 2 line segment O2M2, its upper and lower thickness equates with the four-bladed vane width K2M2 of rotor 2 quadratures, and two waist C4 and D4 are round table surface, the diameter of this 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, and cushion block 5 is shaped as axisymmetric.
Operation working principle of the present invention is as follows:
As Figure 14, in one end of vane pump, rotor 2, blade 3, Stamping Steel Ribbon 4 and housing 1 are divided into five independently Seal cage Q1, Q2, Q3, Q4 and Q5 separately by oil pocket.
When rotor 2 is when Figure 13 position turns clockwise, chamber Q2 starts oil suction, and Q3 and Q4 are oil sucting cavity, and Q5 and Q1 are oil-discharging cavity.
When 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 Q1 still keep isolation.Rotor 2 continues rotation clockwise, and chamber Q4 starts oil extraction, and oil sucting cavity Q2 and Q3 constantly expand, and oil-discharging cavity Q5 and Q1 constantly dwindle.
When forwarding Figure 15 position to, chamber Q1 oil drains.When rotor 2 continues rotation, new oil sucting cavity starts oil suction, and oil sucting cavity Q2 and Q3 are still in continuous expansion, and chamber Q4 and Q5 are still in continuous oil extraction.
When 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 position, chamber Q5 oil drains.When rotor 2 forwards Figure 14 position again to, it is maximum that oil sucting cavity Q2 reaches.So go round and begin again.At the other end of vane pump, situation is also identical with this one end.
Above-described embodiment is used for the present invention that explains, rather than this aspect is limited, and in the protection domain of spirit of the present invention and claim, any modification and change that this aspect is made, all fall into protection scope of the present invention.
Claims (2)
1. a high-performance Pump with multiple vane, it is characterized in that, comprise housing (1), rotor (2), blade (3), Stamping Steel Ribbon (4) and cushion block (5) etc., rotor (2) is positioned at center, housing (1) is positioned at outside, blade (3) be placed in housing (1) diagonal angle hollow ring in, also be positioned at the groove of rotor (2) simultaneously, and with rotor (2) at an angle, plane of blade (3) and the frustum cone side of rotor (2) are tangent, Stamping Steel Ribbon (4) is positioned between rotor (2) and blade, its plane one side and rotor (2) laminating, round table surface one side is fitted with the round table surface E1 of blade (3), cushion block (5) be positioned at housing (1) diagonal angle hollow ring, just in time fill up by housing (1), blade (3), the vacancy that rotor (2) and Stamping Steel Ribbon (4) form.
2. a kind of high-performance Pump with multiple vane according to claim 1, it is characterized in that, described blade (3) is quadrant shape, has identical four, and wherein a slice blade (3) two plane A1, B1 and cylinder C1, sphere D1 and two round table surface E1, J1 enclose and form; Wherein, C1Shi center is the cylinder that centre of sphere O1, radius are identical with the radius of the cylinder E3 of the hollow ring of housing (1), D1 is that the centre of sphere is the sphere that O1 radius is identical with rotor (2) billiard table C2 radius, E1 and J1 are round table surface, the diameter of its upper bottom surface and bottom surface is respectively straight line R1S1 and straight line M1N1, and M1R1 and N1S1 are its side buses; Two plane A1 are parallel with B1; The distance of two parallel plane A1 and B1 is the thickness of blade (3), and blade (3) thickness equates with the hollow ring width of housing (1);
Described Stamping Steel Ribbon (4) has identical eight, wherein an E1 side is round table surface, the diameter of its upper bottom surface and bottom surface is respectively straight line R1S1 and P1Q1, P1R1 and N1S1 are its side buses, K1 side is plane, cross axis and this plane parallel of centre of sphere O 1, its perpendicular distance is half of four-bladed vane thickness of slab of rotor (2) quadrature, G1 is that the centre of sphere is the sphere that O1 radius equates with rotor (2) center billiard table 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 I1 are parallel planes, its half long OP1 equates with housing (1) cylinder F3 radius, width equates with blade (3) width, R1 and the S1 inclined-plane that to be two gradients equate for the gradient of B3 with face D3 in Fig. 7, the width of Stamping Steel Ribbon (4) equates with blade (3) thickness, blade (3) and Stamping Steel Ribbon (4) are axisymmetric,
It in the middle of described rotor (2), is the parallel dolioform billiard table that cuts out two spherical crowns in two, in the middle of billiard table, as symmetry, insert the four-bladed vane of a quadrature, cydariform billiard table two is two identical hollow round tables, A2 is parallel disk with B2, R2 is also parallel disk with S2, 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 two Stamping Steel Ribbons (4) are vertically placed in the groove between I2 and J2, 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 with F2, G2 and H2 are two identical hollow round table part sides, one upper and lower two ends of side round platform were respectively disk A2 and disk R2, upper and lower two ends of opposite side round platform are respectively disk B2 and disk S2, the length of straigh line of K2M2 is the width of rotor (2), two frustum cone side G2 and H2 and corresponding housing (1) hollow ring parallel plane C3 and D3 fit, whole rotor (2) is not only about billiard table center O 2 symmetries, also be axisymmetric,
Described housing (1) is the parallel dolioform sphere that cuts out two spherical crowns in two, thickness equates with the width K2M2 of rotor (2), A3 is the parallel disk that two radiuses equate with B3, F3 is cylinder, its central shaft is crossed O3, radius equates with the radius of rotor (2) left and right outside E2 and F2 cylinder, the diagonal angle of housing (1) cylinder is a hollow ring, annulus width equates with blade (3) thickness, two side C3 of hollow ring are parallel circular planes with D3, E3 is that central shaft is by the cylinder of O3, be positioned on the diagonal of housing (1), its external diameter equates with the external diameter of blade (3) cylinder C1, and be greater than the external diameter of housing (1) cylinder F3, the C3 that annulus is parallel and D3 two planes fit with corresponding rotor (2) two hollow round table side G2 and H2, whole housing (1) is about billiard table center O 3 symmetries,
Described cushion block (5) is one section of annulus, have identical four, wherein an outside A4 is the cylinder that radius equates with housing (1) diagonal angle annulus E3 external diameter, inner side B4 is the sphere that radius equals rotor (2) line segment O2M2, its upper and lower thickness equates with the four-bladed vane width K2M2 of rotor (2) quadrature, 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 line P1Q1 and M1N1, M1P1 is its side bus, and cushion block (5) is shaped as axisymmetric.
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 true CN103671096A (en) | 2014-03-26 |
| CN103671096B CN103671096B (en) | 2016-05-18 |
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| 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 |
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| Country | Link |
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| CN (1) | CN103671096B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109236639A (en) * | 2018-09-28 | 2019-01-18 | 浙江大学 | High-pressure high-flow Pump with multiple vane |
| CN109469610A (en) * | 2018-09-28 | 2019-03-15 | 浙江大学 | High-performance multiple-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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109236639A (en) * | 2018-09-28 | 2019-01-18 | 浙江大学 | High-pressure high-flow Pump with multiple vane |
| CN109469610A (en) * | 2018-09-28 | 2019-03-15 | 浙江大学 | High-performance multiple-blade pump |
| CN109469610B (en) * | 2018-09-28 | 2021-04-06 | 浙江大学 | High performance multiple vane pump |
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| Publication number | Publication date |
|---|---|
| CN103671096B (en) | 2016-05-18 |
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Granted publication date: 20160518 Termination date: 20181216 |