CN105972218A - End surface type magnetic fluid sealing device - Google Patents
End surface type magnetic fluid sealing device Download PDFInfo
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- CN105972218A CN105972218A CN201610351292.2A CN201610351292A CN105972218A CN 105972218 A CN105972218 A CN 105972218A CN 201610351292 A CN201610351292 A CN 201610351292A CN 105972218 A CN105972218 A CN 105972218A
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- Prior art keywords
- ring
- pole shoe
- shoe ring
- annular groove
- magnetic fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The invention relates to the field of mechanical engineering sealing, in particular to an end surface type magnetic fluid sealing device. The end surface type magnetic fluid sealing device comprises a shaft, a shell, a left pole shoe ring, a right pole shoe ring and a permanent magnet. The left pole shoe ring is installed on the outer wall of the left front end of the shaft. The right pole shoe ring is installed on the outer wall of the shaft behind the left pole shoe ring. The right end surface of the left pole shoe ring is provided with one or more first annular grooves. The left end surface of the right pole shoe ring is provided with pole teeth of which the number is consistent with the number of the first annular grooves. The pole teeth stretch into the first annular grooves. A sealing medium is arranged between the left end surface of each pole tooth and the bottom surface of the corresponding first annular groove. A second annular groove is formed in the position, close to the outer wall of the shaft, of the right pole shoe ring. The permanent magnet is installed in the second annular groove. According to the end surface type magnetic fluid sealing device, the end surface type radial sealing rings are adopted, the influence of rotating shaft rotation on the size of radial sealing clearances can be avoided, and the sealing performance is more reliable.
Description
Technical field
The invention belongs to sealing field of mechanical engineering, be specifically related to the end-surface type magnetic fluid seal device that a kind of voltage endurance capability is strong.
Background technology
Along with economical growing, sealing property is required more and more higher by the association areas such as industrial equipment, traditional sealing means has been difficult to meet the seal request of some special occasions, the development of magnetic fluid technique has promoted the development of Magneticfluid Seal Technique, and Magneticfluid Seal Technique just plays an increasingly important role in field of sealing technology.Magnet fluid sealing development trend requires to need to improve sealing reliability and sealability.Existing magnetic fluid seal device many employings axial seal structure, on pole shoe or permanent magnet, i.e. offer pole tooth vertically, form through type or stepped seal clearance, and in seal clearance, inject magnetic fluid formation sealing, though this kind seals structure compared to conventional seals structure, sealing property is greatly improved, but owing to the pressure-bearing value of magnetic fluid seal is the most sensitive to the size of seal clearance, magnetic fluid shaft seal pressure-bearing value can be made to reduce by more than 10% if ring packing gap increases 0.1mm, therefore, the a little increase in ring packing gap may result in being decreased obviously of magnetic fluid shaft seal pressure-bearing value.Therefore should reduce the radial dimension in ring packing gap when designing it and sealing structure as far as possible, but, less ring packing gap size brings the biggest inconvenience can to the processing of each seal member of shaft sealing device with magnetic fluids and installation, the precision of seal member machining should be increased, the installation accuracy of seal member to be improved, additionally, the reduction of seal clearance radial dimension the most easily causes generation rigid contact between rotating shaft and sealing pole tooth to cause rigidity to be worn and torn, ring packing gap radial dimension is made to significantly increase, thus cause magnetic fluid shaft seal bearing capacity to reduce.In consideration of it, be necessary the design of device for sealing magnetic fluid is improved, device for sealing magnetic fluid is made to avoid the impact turning shaft run-out to sealing property.
Summary of the invention
Present invention seek to address that existing sealing device voltage endurance capability is low, during seal failure, magnetic fluid leakage rate is big, the difficult problem that sealing reliability can be relatively low, it is provided that the end-surface type magnetic fluid seal device that a kind of sealing reliability is high.
Technical scheme is as follows:
A kind of end-surface type magnetic fluid seal device, including axle, shell, left pole shoe ring, right pole shoe ring, permanent magnet；
Described left pole shoe ring is installed on the outer wall of the left front end of axle, and described right pole shoe ring is installed on the outer wall of the axle after left pole shoe ring；
More than one annular groove I is offered on the right side of described left pole shoe ring；The pole tooth consistent with annular groove I quantity is offered on the left side of described right pole shoe ring；Described pole tooth stretches in annular groove I, arranges sealing medium between left side and the bottom surface of annular groove I of pole tooth；
Described right pole shoe ring presses close to offer annular groove II on the position of axle outer wall, and described permanent magnet is installed in annular groove II, and described permanent magnet is radial magnetizing type permanent magnet.
End-surface type magnetic fluid seal device of the present invention also includes that jump ring, locating ring, magnetism-isolating loop, bearing, described card Huang are installed between left pole shoe ring and right pole shoe ring, for axially positioning pole shoe ring；Described magnetism-isolating loop, bearing are sequentially arranged on the axle on the right side of right pole shoe ring, and described bearing arranges two, arranges locating ring between two bearings.
Described magnetism-isolating loop includes outer magnetism-isolating loop, interior magnetism-isolating loop, and interior magnetism-isolating loop is installed on axle, and outer magnetism-isolating loop is installed on the inwall of shell, there is gap between outer wall and the inwall of outer magnetism-isolating loop of interior magnetism-isolating loop, and the axial length of interior magnetism-isolating loop and outer magnetism-isolating loop is equal.
Described locating ring includes outer positioning ring and inner position ring, and inner position ring is installed on axle, and outer positioning ring is installed on the inwall of shell, there is gap between outer wall and the inwall of outer positioning ring of inner position ring, and inner position ring is equal with the axial length of outer positioning ring.
Offer an annular groove III on the left side of described left pole shoe ring, rubber ring is installed in annular groove III.
The axial depth of the described annular groove I in left pole shoe ring is 0.7-30mm, and radial height is 0.5 ~ 5mm.
The axial length of the described pole tooth in right pole shoe ring is 10-60mm, and radial height is 0.3 ~ 4.8mm.
Distance between left side and the bottom of annular groove I of described pole tooth is 0.1-3mm.
The installation process of end-surface type magnetic fluid seal device of the present invention is as follows: be installed on by permanent magnet in the annular groove II of right pole shoe ring, right pole shoe ring, jump ring being mounted on an axle from left side in order, the left end at the pole tooth of right pole shoe ring injects magnetic fluid；Rubber ring is arranged in the groove III of left pole shoe ring left side, more left pole shoe ring is mounted on an axle from left side, make the annular groove I in left pole shoe ring match with the pole tooth in right pole shoe ring；On the right side of right pole shoe ring successively by magnetism-isolating loop, be positioned at left side bearing, locating ring, be positioned at right side bearing be installed on axle；Shell is installed, makes shell cover the part on axle；Finally by threadeding of end cap and shell, compress the outer ring of the bearing being positioned at right side.
Magnetic fluid is injected the left side of the pole tooth of right pole shoe ring by the present invention, pole tooth is installed in the annular groove I of left pole shoe ring, it is matched with radial magnetizing type permanent magnet and realizes end-surface type sealing, magnetic circuit is shorter, the magnetic field force that magnetic fluid is subject to is relatively strong, and therefore during seal failure, the loss amount of magnetic fluid is few；It addition, use the end-surface type of the present invention to seal structure, the voltage endurance capability of sealing device is strong, and sealing reliability is high；Jump ring is set between left pole shoe ring and right pole shoe ring, it is achieved the axial location of pole shoe ring, it is ensured that the pole tooth in right pole shoe ring and the stability of the groove seal clearance in left pole shoe ring；The present invention uses the radial seal ring structure of end-surface type, can be prevented effectively from the impact turning shaft run-out to magnetic fluid seal, improve the reliability of device for sealing magnetic fluid sealing property.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of end-surface type magnetic fluid seal device of the present invention
In figure, the structure title of each sequence number and correspondence is as follows: 1-axle, 2-shell, the left pole shoe ring of 3-, 4-annular groove I, 5-pole tooth, the right pole shoe ring of 6-, the outer magnetism-isolating loop of 7-annular groove II, 8-, magnetism-isolating loop in 9-, 10-bearing, 11-end cap, 12-inner position ring, 13-outer positioning ring, 14-permanent magnet, 15-jump ring, 16-annular groove III.
Detailed description of the invention
The invention will be further described to utilize embodiment below in conjunction with the accompanying drawings.
Embodiment 1
As it is shown in figure 1, a kind of end-surface type magnetic fluid seal device, including axle 1, shell 2, left pole shoe ring 3, right pole shoe ring 6, permanent magnet 14；
Described left pole shoe ring 3 is installed on the outer wall of the left front end of axle 1, and described right pole shoe ring 6 is installed on the outer wall of the axle 1 after left pole shoe ring 3；
An annular groove I4 is offered on the right side of described left pole shoe ring 3；The pole tooth 5 consistent with annular groove I4 quantity is offered on the left side of described right pole shoe ring 6；Described pole tooth 5 stretches in annular groove I4, arranges sealing medium between left side and the bottom surface of annular groove I4 of pole tooth 5；
Described right pole shoe ring 6 presses close to offer annular groove II7 on the position of axle 1 outer wall, and described permanent magnet 14 is installed in annular groove II7, and described permanent magnet 14 is radial magnetizing type permanent magnet.
End-surface type magnetic fluid seal device of the present invention also includes that jump ring 15, locating ring, magnetism-isolating loop, bearing 10, described card Huang 15 are installed between left pole shoe ring 3 and right pole shoe ring 6, for axially positioning pole shoe ring；Described magnetism-isolating loop, bearing 10 are sequentially arranged on the axle 1 on the right side of right pole shoe ring 6, and described bearing 10 arranges two, arranges locating ring between two bearings 10.
Described magnetism-isolating loop includes outer magnetism-isolating loop 8, interior magnetism-isolating loop 9, interior magnetism-isolating loop 9 is installed on axle 1, outer magnetism-isolating loop 8 is installed on the inwall of shell 2, there is gap between outer wall and the inwall of outer magnetism-isolating loop 8 of interior magnetism-isolating loop 9, and the axial length of interior magnetism-isolating loop 9 and outer magnetism-isolating loop 8 is equal.
Described locating ring includes outer positioning ring 13 and inner position ring 12, inner position ring 12 is installed on axle 1, outer positioning ring 13 is installed on the inwall of shell 2, there is gap between outer wall and the inwall of outer positioning ring 13 of inner position ring 12, and inner position ring 12 is equal with the axial length of outer positioning ring 3.
Offer an annular groove III16 on the left side of described left pole shoe ring 3, rubber ring is installed in annular groove III16.
The axial depth of the described annular groove I4 in left pole shoe ring 3 is 0.7mm, and radial height is 0.5mm.
The axial length of the described pole tooth 5 in right pole shoe ring 6 is 10mm, and radial height is 0.3mm.
Distance between left side and the bottom of annular groove I4 of described pole tooth 5 is 0.1mm.
The installation process of the end-surface type magnetic fluid seal device described in the present embodiment is as follows: be installed on by permanent magnet 14 in the annular groove II7 of right pole shoe ring 6, right pole shoe ring 6, jump ring 15 being arranged on axle 1 from left side in order, the left end at the pole tooth 5 of right pole shoe ring 6 injects magnetic fluid；Rubber ring is arranged in the groove III16 of left pole shoe ring 3 left side, more left pole shoe ring 3 is arranged on axle 1 from left side, make the annular groove I4 in left pole shoe ring 3 match with the pole tooth in right pole shoe ring 6；On the right side of right pole shoe ring 6 successively by magnetism-isolating loop, be positioned at left side bearing 10, locating ring, be positioned at right side bearing 10 be installed on axle 1；Shell 2 is installed, makes shell 2 cover the part on axle；Finally by threadeding of end cap 11 and shell 2, compress the outer ring of the bearing 10 being positioned at right side.
Embodiment 2
As it is shown in figure 1, a kind of end-surface type magnetic fluid seal device, including axle 1, shell 2, left pole shoe ring 3, right pole shoe ring 6, permanent magnet 14；
Described left pole shoe ring 3 is installed on the outer wall of the left front end of axle 1, and described right pole shoe ring 6 is installed on the outer wall of the axle 1 after left pole shoe ring 3；
Three annular groove I4 are offered on the right side of described left pole shoe ring 3；The pole tooth 5 consistent with annular groove I4 quantity is offered on the left side of described right pole shoe ring 6；Described pole tooth 5 stretches in annular groove I4, arranges sealing medium between left side and the bottom surface of annular groove I4 of pole tooth 5；
Described right pole shoe ring 6 presses close to offer annular groove II7 on the position of axle 1 outer wall, and described permanent magnet 14 is installed in annular groove II7, and described permanent magnet 14 is radial magnetizing type permanent magnet.
End-surface type magnetic fluid seal device of the present invention also includes that jump ring 15, locating ring, magnetism-isolating loop, bearing 10, described card Huang 15 are installed between left pole shoe ring 3 and right pole shoe ring 6, for axially positioning pole shoe ring；Described magnetism-isolating loop, bearing 10 are sequentially arranged on the axle 1 on the right side of right pole shoe ring 6, and described bearing 10 arranges two, arranges locating ring between two bearings 10.
Described magnetism-isolating loop includes outer magnetism-isolating loop 8, interior magnetism-isolating loop 9, interior magnetism-isolating loop 9 is installed on axle 1, outer magnetism-isolating loop 8 is installed on the inwall of shell 2, there is gap between outer wall and the inwall of outer magnetism-isolating loop 8 of interior magnetism-isolating loop 9, and the axial length of interior magnetism-isolating loop 9 and outer magnetism-isolating loop 8 is equal.
Described locating ring includes outer positioning ring 13 and inner position ring 12, inner position ring 12 is installed on axle 1, outer positioning ring 13 is installed on the inwall of shell 2, there is gap between outer wall and the inwall of outer positioning ring 13 of inner position ring 12, and inner position ring 12 is equal with the axial length of outer positioning ring 3.
Offer an annular groove III16 on the left side of described left pole shoe ring 3, rubber ring is installed in annular groove III16.
The axial depth of the described annular groove I4 in left pole shoe ring 3 is 15mm, and radial height is 3mm.
The axial length of the described pole tooth 5 in right pole shoe ring 6 is 30mm, and radial height is 2.8mm.
Distance between left side and the bottom of annular groove I4 of described pole tooth 5 is 1.5mm.
The installation process of the end-surface type magnetic fluid seal device described in the present embodiment is as described in Example 1.
Embodiment 3
As it is shown in figure 1, a kind of end-surface type magnetic fluid seal device, including axle 1, shell 2, left pole shoe ring 3, right pole shoe ring 6, permanent magnet 14；
Described left pole shoe ring 3 is installed on the outer wall of the left front end of axle 1, and described right pole shoe ring 6 is installed on the outer wall of the axle 1 after left pole shoe ring 3；
Four annular groove I4 are offered on the right side of described left pole shoe ring 3；The pole tooth 5 consistent with annular groove I4 quantity is offered on the left side of described right pole shoe ring 6；Described pole tooth 5 stretches in annular groove I4, arranges sealing medium between left side and the bottom surface of annular groove I4 of pole tooth 5；
Described right pole shoe ring 6 presses close to offer annular groove II7 on the position of axle 1 outer wall, and described permanent magnet 14 is installed in annular groove II7, and described permanent magnet 14 is radial magnetizing type permanent magnet.
End-surface type magnetic fluid seal device of the present invention also includes that jump ring 15, locating ring, magnetism-isolating loop, bearing 10, described card Huang 15 are installed between left pole shoe ring 3 and right pole shoe ring 6, for axially positioning pole shoe ring；Described magnetism-isolating loop, bearing 10 are sequentially arranged on the axle 1 on the right side of right pole shoe ring 6, and described bearing 10 arranges two, arranges locating ring between two bearings 10.
Described magnetism-isolating loop includes outer magnetism-isolating loop 8, interior magnetism-isolating loop 9, interior magnetism-isolating loop 9 is installed on axle 1, outer magnetism-isolating loop 8 is installed on the inwall of shell 2, there is gap between outer wall and the inwall of outer magnetism-isolating loop 8 of interior magnetism-isolating loop 9, and the axial length of interior magnetism-isolating loop 9 and outer magnetism-isolating loop 8 is equal.
Described locating ring includes outer positioning ring 13 and inner position ring 12, inner position ring 12 is installed on axle 1, outer positioning ring 13 is installed on the inwall of shell 2, there is gap between outer wall and the inwall of outer positioning ring 13 of inner position ring 12, and inner position ring 12 is equal with the axial length of outer positioning ring 3.
Offer an annular groove III16 on the left side of described left pole shoe ring 3, rubber ring is installed in annular groove III16.
The axial depth of the described annular groove I4 in left pole shoe ring 3 is 30mm, and radial height is 5mm.
The axial length of the described pole tooth 5 in right pole shoe ring 6 is 60mm, and radial height is 4.8mm.
Distance between left side and the bottom of annular groove I4 of described pole tooth 5 is 3mm.
The installation process of the end-surface type magnetic fluid seal device described in the present embodiment is as described in Example 1.
Claims (10)
1. an end-surface type magnetic fluid seal device, including axle (1), shell (2), left pole shoe ring (3), right pole shoe ring (6), permanent magnet (14)；It is characterized in that:
Described left pole shoe ring (3) is installed on the outer wall of axle (1) left front end, and described right pole shoe ring (6) is installed on the outer wall of the axle (1) after left pole shoe ring (3)；
More than one annular groove I(4 is offered) on the right side of described left pole shoe ring (3)；Offer and annular groove I(4 on the left side of described right pole shoe ring (6)) pole tooth (5) that quantity is consistent；Described pole tooth (5) stretches into annular groove I(4) in, the left side of pole tooth (5) and annular groove I(4) bottom surface between sealing medium is set；
Described right pole shoe ring (6) press close to offer annular groove II(7 on the position of axle (1) outer wall), described permanent magnet (14) is installed on annular groove II(7) in.
2. end-surface type magnetic fluid seal device as claimed in claim 1, it is characterised in that: also including jump ring (15), described card yellow (15) is installed between left pole shoe ring (3) and right pole shoe ring (6), for axially positioning pole shoe ring.
3. end-surface type magnetic fluid seal device as claimed in claim 1, it is characterised in that: described permanent magnet (14) is radial magnetizing type permanent magnet.
4. end-surface type magnetic fluid seal device as claimed in claim 1, it is characterized in that: also include locating ring, magnetism-isolating loop, bearing (10), described magnetism-isolating loop, bearing (10) are sequentially arranged on the axle (1) on right pole shoe ring (6) right side, described bearing (10) arranges two, arranges locating ring between two bearings (10).
5. end-surface type magnetic fluid seal device as claimed in claim 4, it is characterized in that: described magnetism-isolating loop includes outer magnetism-isolating loop (8), interior magnetism-isolating loop (9), interior magnetism-isolating loop (9) is installed on axle (1), outer magnetism-isolating loop (8) is installed on the inwall of shell (2), there is gap between outer wall and the inwall of outer magnetism-isolating loop (8) of interior magnetism-isolating loop (9), the axial length of interior magnetism-isolating loop (9) and outer magnetism-isolating loop (8) is equal.
6. end-surface type magnetic fluid seal device as claimed in claim 5, it is characterized in that: described locating ring includes outer positioning ring (13) and inner position ring (12), inner position ring (12) is installed on axle (1), outer positioning ring (13) is installed on the inwall of shell (2), there is gap between outer wall and the inwall of outer positioning ring (13) of inner position ring (12), inner position ring (12) is equal with the axial length of outer positioning ring (3).
7. end-surface type magnetic fluid seal device as claimed in claim 1, it is characterised in that: offer an annular groove III(16 on the left side of described left pole shoe ring (3)), at annular groove III(16) in installation rubber ring.
8. end-surface type magnetic fluid seal device as claimed in claim 1, it is characterised in that: the axial depth described annular groove I(4 in left pole shoe ring (3)) is 0.7-30mm, and radial height is 0.5 ~ 5mm.
9. end-surface type magnetic fluid seal device as claimed in claim 1, it is characterised in that: the axial length of the described pole tooth (5) in right pole shoe ring (6) is 10-60mm, and radial height is 0.3 ~ 4.8mm.
10. end-surface type magnetic fluid seal device as claimed in claim 1, it is characterised in that: the left side of described pole tooth (5) and annular groove I(4) bottom between distance be 0.1-3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610351292.2A CN105972218B (en) | 2016-05-25 | 2016-05-25 | A kind of end-surface type magnetic fluid seal device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610351292.2A CN105972218B (en) | 2016-05-25 | 2016-05-25 | A kind of end-surface type magnetic fluid seal device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105972218A true CN105972218A (en) | 2016-09-28 |
| CN105972218B CN105972218B (en) | 2018-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610351292.2A Active CN105972218B (en) | 2016-05-25 | 2016-05-25 | A kind of end-surface type magnetic fluid seal device |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1988005142A1 (en) * | 1986-12-24 | 1988-07-14 | Touhoku-Kinzoku-Kougyo Ltd. | Magnetic fluid sealing device |
| JPS6483976A (en) * | 1987-09-25 | 1989-03-29 | Fujitsu Ltd | Magnetic fluid seal device |
| CN1184906A (en) * | 1997-12-05 | 1998-06-17 | 中国矿业大学 | Magnetic fluid sealing device |
| CN2651527Y (en) * | 2003-11-24 | 2004-10-27 | 北京交通大学 | Magnetic liquid sealer with guiding structure |
| CN102425672A (en) * | 2011-08-19 | 2012-04-25 | 北京交通大学 | Split magnetic liquid sealing device |
| CN104948744A (en) * | 2015-07-06 | 2015-09-30 | 湖南维格磁流体股份有限公司 | Ultrahigh vacuum magnetic fluid seal transmission device |
| CN105351528A (en) * | 2015-11-06 | 2016-02-24 | 北京交通大学 | Magnetic liquid magnetic sealing device suitable for high rotating speed condition |
| CN205663887U (en) * | 2016-05-25 | 2016-10-26 | 广西科技大学 | Terminal surface formula magnetic fluid seal device |
-
2016
- 2016-05-25 CN CN201610351292.2A patent/CN105972218B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1988005142A1 (en) * | 1986-12-24 | 1988-07-14 | Touhoku-Kinzoku-Kougyo Ltd. | Magnetic fluid sealing device |
| JPS6483976A (en) * | 1987-09-25 | 1989-03-29 | Fujitsu Ltd | Magnetic fluid seal device |
| CN1184906A (en) * | 1997-12-05 | 1998-06-17 | 中国矿业大学 | Magnetic fluid sealing device |
| CN2651527Y (en) * | 2003-11-24 | 2004-10-27 | 北京交通大学 | Magnetic liquid sealer with guiding structure |
| CN102425672A (en) * | 2011-08-19 | 2012-04-25 | 北京交通大学 | Split magnetic liquid sealing device |
| CN104948744A (en) * | 2015-07-06 | 2015-09-30 | 湖南维格磁流体股份有限公司 | Ultrahigh vacuum magnetic fluid seal transmission device |
| CN105351528A (en) * | 2015-11-06 | 2016-02-24 | 北京交通大学 | Magnetic liquid magnetic sealing device suitable for high rotating speed condition |
| CN205663887U (en) * | 2016-05-25 | 2016-10-26 | 广西科技大学 | Terminal surface formula magnetic fluid seal device |
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| CN105972218B (en) | 2018-06-08 |
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