CN104279157A - Screw pump with metal stator with equal wall thickness - Google Patents
Screw pump with metal stator with equal wall thickness Download PDFInfo
- Publication number
- CN104279157A CN104279157A CN201410466568.2A CN201410466568A CN104279157A CN 104279157 A CN104279157 A CN 104279157A CN 201410466568 A CN201410466568 A CN 201410466568A CN 104279157 A CN104279157 A CN 104279157A
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- stator
- metal
- millimeter
- rotor
- screw pump
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Abstract
The invention relates to a screw pump with a metal stator with equal wall thickness. The screw pump comprises the metal stator (1) and is characterized in that the metal stator (1) is made of a metal pipe with equal wall thickness, a stator cavity (3) with a double-helix curved surface, a triple-helix curved surface or an N-helix curved surface is formed inside the metal stator (1), a solid rotor (4) or a hollow rotor (5) is arranged in the stator cavity (3) in a matching manner, and the stator cavity (3) and the solid rotor (4) or the hollow rotor (5) are meshed by conjugate hyperbola at the contact position of the spiral curved surface. Compared with a traditional screw pump stator, the metal stator is elongated obviously, so that a traditional mode that a plurality of stator pipes are connected and combined is avoided, the mechanical strength and the reliability of the screw pump are improved, the pipe wall is uniform in thickness, and expansion nonuniformity cannot be caused; by virtue of an inner surface treatment layer of the stator and a surface treatment layer of the rotor, the wear-resisting property can be greatly improved, the service life is prolonged, and the screw pump is suitable for use in a high-temperature high-pressure environment in an oil well.
Description
Technical field
The present invention relates to a kind of screw pump, particularly relate to one and wait wall thickness metal stator screw pump, belong to oil exploration equipment technical field.
Background technique
Current known prior art metal stator screw pump stator is outer surface is cylindrical, and internal surface is spirality die cavity.The thickness difference of such stator major cross-sectional axis and short-axis direction is comparatively large, and tube wall became uneven, causes the non-homogeneous expansion of metal, and the cooperation that have impact on stators and rotators is uneven, have impact on mechanical property.The stator tube that existing length is longer adopts more piece stator tube to combine, but the stator tube mechanical strength after being connected and functional reliability all can reduce, and rate of fault is higher.
The processing of prior art stator, mostly is metal bar material internal bore boring, as public announcement of a patent application CN102979717A.This invention restriction owing to being subject to processing length, stator tube can only be combined by a few joint, the reliability of such machinery is just subject to certain impact, although hard material infiltration layer has all been done on this invention stator rotor surface, but major metal or the same, as everyone knows, same metal can produce affinity phenomenon in high-speed friction, determine to pull with having turned just easily to produce, so screw pump life in application can be reduced, for another example the processing electrolysis method of public announcement of a patent application CN 102501016A bore of stator is shaping, adopt the mode processing speed of electrolytic formation very slow, work efficiency is very low, and the stator tube inner chamber error after processing also can be caused larger due to the consumption of electrolytic head, machining accuracy is difficult to control, make quality of product not high.
Summary of the invention
The object of the invention is for existing metal stator screw pump complex structure, length is shorter, more piece is needed to be connected use, mechanical strength and stability are not good, and screw stator easily causes inequality of being heated, the defect that wear-resisting property is poor and deficiency, a kind of compact structure is now provided, easily manufactured, mechanical strength and stability are obtained for raising, tube wall thickness is even, can not cause the phenomenon that non-homogeneous expansion is even, simultaneously High planting can be improved the wall thickness metal stator screw pump such as one.
For achieving the above object, technical solution of the present invention is: one waits wall thickness metal stator screw pump, comprise metal stator, described metal stator is made by waiting metal tube of wall thickness, the inside of metal stator is provided with in double helix curved surface, the stator die cavity of three spiral cambers or N spiral camber, coordinate in stator die cavity and solid rotor or sleeve rotor are installed, the outer round surface correspondence of solid rotor or sleeve rotor is provided with single-screw curved surface, double helix curved surface or N-1 spiral camber, wherein N be more than or equal to 2 integer, stator die cavity is mutually meshing with the conjugate hyperbolas by spiral camber contacting point between solid rotor or sleeve rotor, the inwall of stator die cavity is provided with stator inner surface processing layer, the outer surface of solid rotor and sleeve rotor is provided with rotor surface processing layer.
The two ends of described metal stator are cylindrical tube, and the screw thread form gradual transition of metal stator is to cylindrical, and the outer surface of cylindrical tube is provided with tip side screw thread.
The wall thickness of described metal stator is 5 millimeters-10 millimeters, and the length of metal stator is 4 meters-8 meters.
Described stator inner surface processing layer is hard material infiltration layer, and the thickness of hard material infiltration layer is 0.08 millimeter-0.35 millimeter.
Described stator inner surface processing layer is chromium coating, and the thickness of chromium coating is 0.05 millimeter-0.25 millimeter.
Described rotor surface processing layer is plasma ceramic sprayfused coating, plating red metal layer or rubber layer, and the thickness of plasma ceramic sprayfused coating is 0.1 millimeter-1 millimeter, and the thickness of plating red metal layer is 0.5 millimeter-2 millimeters, and the thickness of rubber layer is 3 millimeters-5 millimeters.
Described metal stator and outer surface are the gap between cation ceramic sprayfused coating, the rotor plating red metal layer is 0.02 millimeter-0.15 millimeter, metal stator and outer surface be rubber layer rotor between for interference fit, magnitude of interference is 0.05 millimeter-0.2 millimeter.
The invention has the beneficial effects as follows:
1, metal stator of the present invention by etc. the metal tube of wall thickness make, the inside of metal stator is provided with spiral-shaped stator die cavity, and coordinate in stator die cavity and be provided with solid rotor or sleeve rotor, tube wall thickness is even, can not cause the phenomenon that non-homogeneous expansion is even, usability is improved.
The present invention is compared with traditional screw pump stator, good integrity, avoid the mode adopting traditional more piece stator tube to be connected, improve mechanical strength and the reliability of screw pump, the two ends of metal stator are cylindrical tube, the outer surface of cylindrical tube is provided with tip side screw thread, greatly facilitates installation and the connection of metal stator.
3, compact structure of the present invention, easy to process, mechanical strength and operational safety are obtained for raising, stator inner surface processing layer and rotor surface processing layer have employed unlike material simultaneously, significantly enhance wear-resisting property, improve working life, be suitable for using in the high temperature and high pressure environment in oil well.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention 1 solid rotor.
Fig. 2 is the sectional view of Fig. 1 cross section.
Fig. 3 is the structural representation of the embodiment of the present invention 2 sleeve rotor.
Fig. 4 is the sectional view of Fig. 3 cross section.
In figure: metal stator 1, tip side screw thread 2, stator die cavity 3, solid rotor 4, sleeve rotor 5, stator inner surface processing layer 6, rotor surface processing layer 7.
Embodiment
Illustrate that the present invention is described in further detail with embodiment below in conjunction with accompanying drawing.
See Fig. 1 to Fig. 4, one of the present invention waits wall thickness metal stator screw pump, comprise metal stator 1, described metal stator 1 is made by waiting metal tube of wall thickness, the inside of metal stator 1 is provided with in double helix curved surface, the stator die cavity 3 of three spiral cambers or N spiral camber, coordinate in stator die cavity 3 and solid rotor 4 or sleeve rotor 5 are installed, the outer round surface correspondence of solid rotor 4 or sleeve rotor 5 is provided with single-screw curved surface, double helix curved surface or N-1 spiral camber, wherein N be more than or equal to 2 integer, stator die cavity 3 is mutually meshing with the conjugate hyperbolas by spiral camber contacting point between solid rotor 4 or sleeve rotor 5, the inwall of stator die cavity 3 is provided with stator inner surface processing layer 6, the outer surface of solid rotor 4 and sleeve rotor 5 is provided with rotor surface processing layer 7.
The two ends of described metal stator 1 are cylindrical tube, and the screw thread form gradual transition of metal stator 1 is to cylindrical, and the outer surface of cylindrical tube is provided with tip side screw thread 2.
The wall thickness of described metal stator 1 is 5 millimeters-10 millimeters, and the length of metal stator 1 is 4 meters-8 meters.
Described stator inner surface processing layer 6 is hard material infiltration layer, and the thickness of hard material infiltration layer is 0.08 millimeter-0.35 millimeter.
Described stator inner surface processing layer 6 is chromium coating, and the thickness of chromium coating is 0.05 millimeter-0.25 millimeter.
Described rotor surface processing layer 7 is plasma ceramic sprayfused coating, plating red metal layer or rubber layer, and the thickness of plasma ceramic sprayfused coating is 0.1 millimeter-1 millimeter, and the thickness of plating red metal layer is 0.5 millimeter-2 millimeters, and the thickness of rubber layer is 3 millimeters-5 millimeters.
Described metal stator 1 and outer surface are the gap between cation ceramic sprayfused coating, the rotor plating red metal layer is 0.02 millimeter-0.15 millimeter, metal stator 1 and outer surface be rubber layer rotor between for interference fit, magnitude of interference is 0.05 millimeter-0.2 millimeter.
See Fig. 1 to Fig. 4, metal stator 1 is made by waiting the metal tube of wall thickness, and the inside of metal stator 1 is provided with in double helix curved surface, the stator die cavity 3 of three spiral cambers or N spiral camber, wherein N be more than or equal to 2 integer.The outer surface of metal stator 1 is with the change of inner chamber profile and change, and wall thickness is all impartial, and namely the cross section of metal stator 1 is all uniform thickness in all directions.The wall thickness of metal stator 1 is 5 millimeters-10 millimeters, the length of metal stator 1 is 4 meters-8 meters, optimum length is 4 meters-7 meters, compared with traditional screw pump stator, length is obviously elongated, avoid the mode adopting traditional more piece stator tube to be connected, improve mechanical strength and the reliability of screw pump.
Coordinate in stator die cavity 3 and be provided with solid rotor 4 or sleeve rotor 5, the outer round surface correspondence of solid rotor 4 or sleeve rotor 5 is provided with single-screw curved surface, double helix curved surface or N-1 spiral camber, wherein N be more than or equal to 2 integer.Such as: the solid rotor 4 of single-screw curved surface or sleeve rotor 5 match with the stator die cavity 3 in double helix curved surface, the solid rotor 4 of double helix curved surface or sleeve rotor 5 match with the stator die cavity 3 in three spiral cambers, and the solid rotor 4 of three spiral cambers or sleeve rotor 5 match with the stator die cavity 3 in four spiral cambers.Such as, in accompanying drawing 1, the cross section of stator die cavity 3 is oval ring.The two ends of metal stator 1 are cylindrical tube, and the screw thread form gradual transition of metal stator 1 is to cylindrical, and the outer surface of cylindrical tube is provided with tip side screw thread 2, can facilitate installation and the connection of metal stator 1 like this.
The inwall of stator die cavity 3 is provided with stator inner surface processing layer 6, stator inner surface processing layer 6 is hard material infiltration layer, the thickness of hard material infiltration layer is 0.08 millimeter-0.35 millimeter, and such as: when stator inner surface processing layer 6 is chromium coating, the thickness of chromium coating is 0.05 millimeter-0.35 millimeter.The outer surface of solid rotor 4 and sleeve rotor 5 is provided with rotor surface processing layer 7, rotor surface processing layer 7 is plasma ceramic sprayfused coating, plating red metal layer or rubber layer, the thickness of plasma ceramic sprayfused coating is 0.1 millimeter-1 millimeter, and the thickness of plating red metal layer is 0.2 millimeter-3 millimeters.
Embodiment 1: stator inner surface processing layer 6 is chromium coating, and the thickness of chromium coating is 0.05 millimeter-0.28 millimeter, and the rotor surface processing layer 7 of sleeve rotor 5 is hard material infiltration layer, and alloying layer thickness is 0.1 millimeter-0.30 millimeter.Gap between metal stator 1 and solid rotor 4 is 0.03-0.12 millimeter.
Embodiment 2: stator inner surface processing layer 6 is chromium coating, and the thickness of chromium coating is 0.05 millimeter-0.35 millimeter, and the rotor surface processing layer 7 of solid rotor 4 adopts plating red metal layer, and thickness of coating is 0.2 millimeter-1 millimeter.Gap between metal stator 1 and solid rotor 4 is 0.02-0.15 millimeter.
Embodiment 3: stator inner surface processing layer 6 adopts the flame spraying layer of brass of 0.05 millimeter-0.35 millimeter, and coating thickness is 0.5 millimeter-1.5 millimeters.
Embodiment 4: stator inner surface processing layer 6 adopts plating network layers, thickness of coating is 0.05-0.35 millimeter, and the outer surface of solid rotor 4 is provided with rubber layer, and thickness is 3 millimeters-5 millimeters, be interference fit between metal stator 1 and solid rotor 4, magnitude of interference is 0.05-0.2 millimeter.
Embodiment 65: stator inner surface processing layer 6 is hard material hard material infiltration layer, alloying layer thickness is at 0. 08-0.5 millimeter, the outer surface of solid rotor 4 is plasma sprayed ceramic layer, coating thickness is at 0.1-0.6 millimeter, and the gap between metal stator 1 and solid rotor 4 is 0.02-0.14 millimeter.
Embodiment 6: stator inner surface processing layer 6 is chromium coating, and thickness of coating is 0.05-0.25 millimeter, and the outer surface of sleeve rotor 5 is provided with hard material infiltration layer, and alloying layer thickness is 0.1-0.40 millimeter.Gap between metal stator 1 and solid rotor 4 is 0.05-0.18 millimeter.
Embodiment 7: stator inner surface processing layer 6 is chromium coating, and thickness of coating is 0.05-0.35 millimeter, and the outer surface of sleeve rotor 5 is coated with red metal, and coating is thick is 0.6 millimeter-2 millimeters.Gap between metal stator 1 and sleeve rotor 5 is 0.05-0.16 millimeter.
Embodiment 8: stator inner surface processing layer 6 is chromium coating, and thickness of coating is 0.05-0.28 millimeter, and the outer surface of sleeve rotor 5 is provided with flame spraying layer of brass, coating thickness 0.5-2.5 millimeter.Gap between metal stator 1 and sleeve rotor 5 is 0.08-0.14 millimeter.
Embodiment 9: same wall-thickness stator internal surface 2 is hard material hard material infiltration layer, alloying layer thickness is at 0. 08-0.5 millimeter, the outer surface of sleeve rotor 5 is provided with plasma spray ceramic layer, coating thickness is 0.1-0.5 millimeter, and the gap between metal stator 1 and sleeve rotor 5 is 0.12-0.26 millimeter.
Cooperation between metal stator of the present invention and rotor is accurate, even if also can not produce the even phenomenon of the non-homogeneous expansion that causes due to tube wall became uneven in the oil well of High Temperature High Pressure, usability is improved.Meanwhile, stator inner surface processing layer 6 and rotor surface processing layer 7 significantly enhance wear-resisting property, improve working life, are convenient to large-scale promotion and use.
Claims (7)
1. one kind is waited wall thickness metal stator screw pump, comprise metal stator (1), it is characterized in that: described metal stator (1) is made by waiting metal tube of wall thickness, the inside of metal stator (1) is provided with in double helix curved surface, the stator die cavity (3) of three spiral cambers or N spiral camber, coordinate in stator die cavity (3) and solid rotor (4) or sleeve rotor (5) are installed, the outer round surface correspondence of solid rotor (4) or sleeve rotor (5) is provided with single-screw curved surface, double helix curved surface or N-1 spiral camber, wherein N be more than or equal to 2 integer, stator die cavity (3) is mutually meshing with the conjugate hyperbolas by spiral camber contacting point between solid rotor (4) or sleeve rotor (5), the inwall of stator die cavity (3) is provided with stator inner surface processing layer (6), the outer surface of solid rotor (4) and sleeve rotor (5) is provided with rotor surface processing layer (7).
2. one according to claim 1 waits wall thickness metal stator screw pump, it is characterized in that: the two ends of described metal stator (1) are cylindrical tube, the screw thread form gradual transition of metal stator (1) is to cylindrical, and the outer surface of cylindrical tube is provided with tip side screw thread (2).
3. one according to claim 1 waits wall thickness metal stator screw pump, and it is characterized in that: the wall thickness of described metal stator (1) is 5 millimeters-10 millimeters, the length of metal stator (1) is 4 meters-8 meters.
4. one according to claim 1 waits wall thickness metal stator screw pump, and it is characterized in that: described stator inner surface processing layer (6) is hard material infiltration layer, the thickness of hard material infiltration layer is 0.08 millimeter-0.35 millimeter.
5. one according to claim 1 waits wall thickness metal stator screw pump, and it is characterized in that: described stator inner surface processing layer (6) is chromium coating, the thickness of chromium coating is 0.05 millimeter-0.25 millimeter.
6. one according to claim 1 waits wall thickness metal stator screw pump, it is characterized in that: described rotor surface processing layer (7) is plasma ceramic sprayfused coating, plates red metal layer or rubber layer, the thickness of plasma ceramic sprayfused coating is 0.1 millimeter-1 millimeter, the thickness of plating red metal layer is 0.5 millimeter-2 millimeters, and the thickness of rubber layer is 3 millimeters-5 millimeters.
7. one according to claim 1 waits wall thickness metal stator screw pump, it is characterized in that: described metal stator (1) and outer surface are the gap between cation ceramic sprayfused coating, the rotor plating red metal layer is 0.02 millimeter-0.15 millimeter, metal stator (1) and outer surface be rubber layer rotor between for interference fit, magnitude of interference is 0.05 millimeter-0.2 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410466568.2A CN104279157B (en) | 2014-09-15 | 2014-09-15 | The wall thickness metal stator screw pumps such as one |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410466568.2A CN104279157B (en) | 2014-09-15 | 2014-09-15 | The wall thickness metal stator screw pumps such as one |
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| Publication Number | Publication Date |
|---|---|
| CN104279157A true CN104279157A (en) | 2015-01-14 |
| CN104279157B CN104279157B (en) | 2016-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410466568.2A Active CN104279157B (en) | 2014-09-15 | 2014-09-15 | The wall thickness metal stator screw pumps such as one |
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| CN (1) | CN104279157B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104948448A (en) * | 2015-06-25 | 2015-09-30 | 舟山市第一塑料机械有限公司 | Whole split or integrated all-metal screw pump |
| CN105351184A (en) * | 2015-11-23 | 2016-02-24 | 重庆高研泵业有限公司 | Safety screw pump |
| CN106312449A (en) * | 2015-07-10 | 2017-01-11 | 中国石油天然气股份有限公司 | Low-cost long-life all-metal screw pump processing technology |
| CN109611329A (en) * | 2019-02-19 | 2019-04-12 | 盐城世宏石油装备有限公司 | A kind of processing method of rubber rotor screw oil well pump and rubber rotor |
| CN110043227A (en) * | 2019-04-19 | 2019-07-23 | 中国石油天然气股份有限公司 | Oil-submersible hollow rotor screw pump oil production device |
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| CN1553056A (en) * | 2003-06-03 | 2004-12-08 | 大庆油田有限责任公司 | Screw pump rotor machining process |
| CN1690436A (en) * | 2004-04-22 | 2005-11-02 | 高元芳 | Screw pump and method of production thereof |
| CN201262146Y (en) * | 2008-08-20 | 2009-06-24 | 辽宁华孚石油高科技股份有限公司 | Oil extraction apparatus of full-metal single screw pump |
| CN201396278Y (en) * | 2009-05-15 | 2010-02-03 | 曾正伟 | Multi-head equal wall thickness anti-corrosion screw pump |
| CN201843778U (en) * | 2010-11-04 | 2011-05-25 | 韩全伟 | Iso-wall-thickness rubber stator screw pump |
| CN201943946U (en) * | 2011-01-13 | 2011-08-24 | 武汉雷神特种器材有限公司 | Screw pump stator tube with uniform wall thickness |
| CN102979717A (en) * | 2012-12-18 | 2013-03-20 | 宁波正鼎石油机械设备制造有限公司 | Full-metal high-temperature-resistant screw pump |
| CN204099188U (en) * | 2014-09-15 | 2015-01-14 | 刘云卿 | One waits wall thickness metal stator screw pump |
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2014
- 2014-09-15 CN CN201410466568.2A patent/CN104279157B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1553056A (en) * | 2003-06-03 | 2004-12-08 | 大庆油田有限责任公司 | Screw pump rotor machining process |
| CN1690436A (en) * | 2004-04-22 | 2005-11-02 | 高元芳 | Screw pump and method of production thereof |
| CN201262146Y (en) * | 2008-08-20 | 2009-06-24 | 辽宁华孚石油高科技股份有限公司 | Oil extraction apparatus of full-metal single screw pump |
| CN201396278Y (en) * | 2009-05-15 | 2010-02-03 | 曾正伟 | Multi-head equal wall thickness anti-corrosion screw pump |
| CN201843778U (en) * | 2010-11-04 | 2011-05-25 | 韩全伟 | Iso-wall-thickness rubber stator screw pump |
| CN201943946U (en) * | 2011-01-13 | 2011-08-24 | 武汉雷神特种器材有限公司 | Screw pump stator tube with uniform wall thickness |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104948448A (en) * | 2015-06-25 | 2015-09-30 | 舟山市第一塑料机械有限公司 | Whole split or integrated all-metal screw pump |
| CN106312449A (en) * | 2015-07-10 | 2017-01-11 | 中国石油天然气股份有限公司 | Low-cost long-life all-metal screw pump processing technology |
| CN105351184A (en) * | 2015-11-23 | 2016-02-24 | 重庆高研泵业有限公司 | Safety screw pump |
| CN109611329A (en) * | 2019-02-19 | 2019-04-12 | 盐城世宏石油装备有限公司 | A kind of processing method of rubber rotor screw oil well pump and rubber rotor |
| CN110043227A (en) * | 2019-04-19 | 2019-07-23 | 中国石油天然气股份有限公司 | Oil-submersible hollow rotor screw pump oil production device |
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|---|---|
| CN104279157B (en) | 2016-11-23 |
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