EP3396055A1 - Clothes dryer including condensing apparatus - Google Patents

Clothes dryer including condensing apparatus Download PDF

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Publication number
EP3396055A1
EP3396055A1 EP18165733.9A EP18165733A EP3396055A1 EP 3396055 A1 EP3396055 A1 EP 3396055A1 EP 18165733 A EP18165733 A EP 18165733A EP 3396055 A1 EP3396055 A1 EP 3396055A1
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EP
European Patent Office
Prior art keywords
hot air
wall
air channel
cooling water
flow guide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18165733.9A
Other languages
German (de)
French (fr)
Other versions
EP3396055B1 (en
Inventor
Jun Liu
Fei Lu
Yonggang Xu
Qi Zhang
Xiuhua Zhang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
Original Assignee
BSH Hausgeraete GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Priority to PL18165733T priority Critical patent/PL3396055T3/en
Publication of EP3396055A1 publication Critical patent/EP3396055A1/en
Application granted granted Critical
Publication of EP3396055B1 publication Critical patent/EP3396055B1/en
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Anticipated expiration legal-status Critical

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/24—Condensing arrangements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis

Definitions

  • the present invention relates to a clothes dryer including a condensing apparatus, where the condensing apparatus includes a hot air channel, in communication with a drying chamber, and a water supply apparatus for feeding cooling water into the hot air channel.
  • Clothes dryers usually include machines purely having a function of a clothes dryer and machines integrated with clothes washing and clothes drying functions.
  • a drying principle of a clothes dryer may be generally summarized as follows: under an effect of a heating apparatus, after being heated by the heating apparatus, dry air forms dry hot air, which then enters a drying drum to exchange heat with wet clothes and removes moisture from the clothes, and forms relatively damp hot air; upon condensation by a condensing apparatus, moisture of the damp hot air is condensed into water, which is then discharged through a drain pipe; after being condensed, the air becomes relatively dry cold air, and under an effect of a fan, is led into the heating apparatus again, and forms dry hot air after being heated to enter a next cycle; and such a process is repeated until a drying program ends.
  • the condensing apparatus may include a cooling water supply apparatus. After meeting with wet hot air, cooling water reduces the temperature of the hot air, to separate moisture from the hot air. After entering a hot air channel, the cooling water is likely to be blown about by a high-speed air flow, a condensing effect is unstable. Meanwhile, water droplets that are blown about may enter the fan and a heating channel that are downstream in a circulation direction of the hot air, resulting in reduction of drying efficiency.
  • An objective of the present invention is to improve condensing efficiency of a condensing apparatus of an existing clothes dryer.
  • the present invention provides a clothes dryer including a condensing apparatus, where a condensing apparatus includes a hot air channel, in communication with a drying chamber, and a water supply apparatus, for feeding cooling water into the hot air channel, an inlet of the hot air channel being located at a lower location, an outlet of the hot air channel being located at a higher location, where at least one flow guide rib is formed on a wall of the hot air channel, an upper end of the flow guide rib is close to an outlet of the water supply apparatus, a lower end thereof is close to the inlet of hot air channel, and the flow guide rib and the wall of the hot air channel define a cooling water flowing area together.
  • the cooling water After entering the hot air channel, the cooling water subsequently enters the cooling water flowing area defined by the flow guide rib and the wall of the hot air channel together. In this area, a water flow flows downward along the wall.
  • the flow guide rib also avoids transverse interference of hot air, so that the water flow is stable and would not be splashed randomly. Therefore, a condensing effect is more stable, and condensing efficiency is improved.
  • a further improvement of the present invention is that: the wall included by the hot air channel includes a first wall and a second wall that face each other and that are relatively broad and a third wall that connects the first wall and the second wall and that is relatively narrow, a first flow guide rib is located on the first wall, a second flow guide rib is located on the second wall, and the cooling water flowing area is formed on the first wall, the second wall, and the third wall that use the first flow guide rib and the second flow guide rib as boundaries.
  • both the wall of the hot air channel and the flow guide rib implement a flow guiding function, so that the water flow stably flows along a side of the hot air channel.
  • the outlet of the water supply apparatus is higher than a horizontal centerline of the hot air channel, and is disposed toward the cooling water flowing area.
  • Such deposition provides a longer heat exchange path for the cooling water, and meanwhile, ensures the water to flow into the cooling water flowing area.
  • a protruding structure that transversely extends out is disposed below the cooling water flowing area.
  • the protruding structure blocks and changes a flowing path of the cooling water, so that the cooling water transversely is dispersed on a surface of the protruding structure; on the other hand, the protruding structure blocks hot air below, to cause turbulence of the hot air.
  • the turbulent hot air meets the dispersed cooling water at a location of the protruding structure, and the two get in sufficient contact with each other, disturb each other, and perform heat exchange.
  • the protruding structure produces a significant positive effect.
  • the protruding structure is disposed below the cooling water flowing area, when arriving at the protruding structure, the cooling water has accumulated a certain amount of potential energy, so that the cooling water is dispersed on the protruding structure.
  • the protruding structure extends out from the third wall toward an interior of the hot air channel and includes a free end extending out toward a central area of a cross section of the hot air channel in a suspended manner.
  • the cooling water flows out from the free end, so that the cooling water is closer to the central area of the cross section of the hot air channel, and gets in sufficient contact with the hot air below.
  • the protruding structure connects the first wall and the second wall. Hence, the cooling water only falls down on the free end of the protruding structure, and is more likely to enter the central area of the cross section of the hot air channel.
  • the hot air channel includes a bend proximal to the inlet, and the protruding structure is disposed at a bend joint. Air turbulence at the bend is stronger, and disposing the protruding structure at the bend more beneficially utilizes a design feature of the hot air channel and improves condensing efficiency.
  • the protruding structure is a plate integrally formed with the wall of the hot air channel.
  • a clothes dryer includes a drum 2, forming a drying chamber from clothes, a hot air channel 4, in spatial communication with the drum 2, and a fan 6, enabling air to circulate between the drum 2 and the hot air channel 4.
  • the hot air channel 4 includes an inlet 41, located at a lower location and connected to the drum 2, and an outlet 42, located at a higher location and connected to the fan 6.
  • a water supply apparatus 8 for feeding cooling water into the hot air channel 4 is disposed at a suitable location on the hot air channel 4 and higher than a horizontal centerline a1 of the hot air channel 4.
  • the hot air channel 4 and the water supply apparatus 8 are main elements for forming a condensing apparatus 10.
  • the hot air channel 4 includes a first wall 4a and a second wall 4b that face each other and that are relatively broad and a third wall 4c that connects the first wall 4a and the second wall 4b and that is relatively narrow.
  • a first flow guide rib 11a is integrally formed on the first wall 4a
  • a second flow guide rib 11b is integrally formed on the second wall 4b.
  • the first flow guide rib 11a and the second flow guide rib 11b protrude toward an interior of the hot air channel 4, and meanwhile, are close to the third wall 4c that connects the first wall 4a and the second wall 4b.
  • a cooling water flowing area 12 is formed on the first wall 4a, the second wall 4b, and the third wall 4c that use the first flow guide rib 11a and the second flow guide rib 11b as boundaries.
  • Upper ends 111a and 111b of the first flow guide rib 11a and the second flow guide rib 11b are close to an outlet 81 of the water supply apparatus 8, and lower ends 112a and 112b thereof are close to the inlet 41 of the hot air channel.
  • the outlet 81 of the water supply apparatus is disposed toward the cooling water flowing area 12.
  • a baffle plate 14 integrally manufactured with the third wall 4c is disposed below the cooling water flowing area 12 and transversely extends from the third wall 4c toward the interior of the hot air channel 4.
  • Two other sides of the baffle plate 14 may be connected to the first wall 4a and the second wall 4b.
  • the cooling water In a process of falling down along the cooling water flowing area 12, the cooling water is blocked by the baffle plate 14, then, changes a flowing path, is transversely dispersed on a surface of the baffle plate 14, and falls into the central area of the cross section of the hot air channel 4 from the free end 141.
  • the baffle plate 14 blocks hot air below, to cause turbulence of the hot air.
  • the turbulent hot air meets the dispersed cooling water at a location of the baffle plate 14, and the two get in sufficient contact with each other, disturb each other, and perform heat exchange.
  • the hot air channel 4 includes bend 43 proximal to the inlet 41.
  • the baffle plate 14 is disposed at a bend joint 44. Air turbulence at the bend is stronger, and disposing the baffle plate 14 at the bend more beneficially utilizes a design feature of the hot air channel 4 and improves condensing efficiency.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

A clothes dryer including a condensing apparatus is provided, where the condensing apparatus (10) includes a hot air channel (4), in communication with a drying chamber (2), and a water supply apparatus (8), for feeding cooling water into the hot air channel (4), an inlet (41) of the hot air channel (4) being located at a lower location, an outlet (42) of the hot air channel (4) being located at a higher location, where at least one flow guide rib (11a, 11b) is formed on a wall (4a, 4b, 4c, 4d) of the hot air channel (4), an upper end (111a, 111b) of the flow guide rib (11a, 11b) is close to an outlet (81) of the water supply apparatus (8), a lower end (112a, 112b) thereof is close to the inlet (41) of hot air channel (4), and the flow guide rib (11a, 11b) and the wall (4a, 4b, 4c, 4d) of the hot air channel (4) define a cooling water flowing area (12) together. After entering the hot air channel, the cooling water subsequently enters the cooling water flowing area defined by the flow guide rib and the wall of the hot air channel together, and would not be splashed randomly. Therefore, a condensing effect is more stable, and condensing efficiency is improved.

Description

  • The present invention relates to a clothes dryer including a condensing apparatus, where the condensing apparatus includes a hot air channel, in communication with a drying chamber, and a water supply apparatus for feeding cooling water into the hot air channel.
  • Clothes dryers usually include machines purely having a function of a clothes dryer and machines integrated with clothes washing and clothes drying functions. A drying principle of a clothes dryer may be generally summarized as follows: under an effect of a heating apparatus, after being heated by the heating apparatus, dry air forms dry hot air, which then enters a drying drum to exchange heat with wet clothes and removes moisture from the clothes, and forms relatively damp hot air; upon condensation by a condensing apparatus, moisture of the damp hot air is condensed into water, which is then discharged through a drain pipe; after being condensed, the air becomes relatively dry cold air, and under an effect of a fan, is led into the heating apparatus again, and forms dry hot air after being heated to enter a next cycle; and such a process is repeated until a drying program ends.
  • The condensing apparatus may include a cooling water supply apparatus. After meeting with wet hot air, cooling water reduces the temperature of the hot air, to separate moisture from the hot air. After entering a hot air channel, the cooling water is likely to be blown about by a high-speed air flow, a condensing effect is unstable. Meanwhile, water droplets that are blown about may enter the fan and a heating channel that are downstream in a circulation direction of the hot air, resulting in reduction of drying efficiency.
  • An objective of the present invention is to improve condensing efficiency of a condensing apparatus of an existing clothes dryer.
  • For the foregoing objective, the present invention provides a clothes dryer including a condensing apparatus, where a condensing apparatus includes a hot air channel, in communication with a drying chamber, and a water supply apparatus, for feeding cooling water into the hot air channel, an inlet of the hot air channel being located at a lower location, an outlet of the hot air channel being located at a higher location, where at least one flow guide rib is formed on a wall of the hot air channel, an upper end of the flow guide rib is close to an outlet of the water supply apparatus, a lower end thereof is close to the inlet of hot air channel, and the flow guide rib and the wall of the hot air channel define a cooling water flowing area together. After entering the hot air channel, the cooling water subsequently enters the cooling water flowing area defined by the flow guide rib and the wall of the hot air channel together. In this area, a water flow flows downward along the wall. The flow guide rib also avoids transverse interference of hot air, so that the water flow is stable and would not be splashed randomly. Therefore, a condensing effect is more stable, and condensing efficiency is improved.
  • A further improvement of the present invention is that: the wall included by the hot air channel includes a first wall and a second wall that face each other and that are relatively broad and a third wall that connects the first wall and the second wall and that is relatively narrow, a first flow guide rib is located on the first wall, a second flow guide rib is located on the second wall, and the cooling water flowing area is formed on the first wall, the second wall, and the third wall that use the first flow guide rib and the second flow guide rib as boundaries. In such a structure, both the wall of the hot air channel and the flow guide rib implement a flow guiding function, so that the water flow stably flows along a side of the hot air channel.
  • Preferably, the outlet of the water supply apparatus is higher than a horizontal centerline of the hot air channel, and is disposed toward the cooling water flowing area. Such deposition provides a longer heat exchange path for the cooling water, and meanwhile, ensures the water to flow into the cooling water flowing area.
  • A protruding structure that transversely extends out is disposed below the cooling water flowing area. On the one hand, the protruding structure blocks and changes a flowing path of the cooling water, so that the cooling water transversely is dispersed on a surface of the protruding structure; on the other hand, the protruding structure blocks hot air below, to cause turbulence of the hot air. Hence, the turbulent hot air meets the dispersed cooling water at a location of the protruding structure, and the two get in sufficient contact with each other, disturb each other, and perform heat exchange. In view of this, the protruding structure produces a significant positive effect. Meanwhile, because the protruding structure is disposed below the cooling water flowing area, when arriving at the protruding structure, the cooling water has accumulated a certain amount of potential energy, so that the cooling water is dispersed on the protruding structure.
  • Particularly, the protruding structure extends out from the third wall toward an interior of the hot air channel and includes a free end extending out toward a central area of a cross section of the hot air channel in a suspended manner. The cooling water flows out from the free end, so that the cooling water is closer to the central area of the cross section of the hot air channel, and gets in sufficient contact with the hot air below.
  • Further, the protruding structure connects the first wall and the second wall. Hence, the cooling water only falls down on the free end of the protruding structure, and is more likely to enter the central area of the cross section of the hot air channel.
  • The hot air channel includes a bend proximal to the inlet, and the protruding structure is disposed at a bend joint. Air turbulence at the bend is stronger, and disposing the protruding structure at the bend more beneficially utilizes a design feature of the hot air channel and improves condensing efficiency.
  • The protruding structure is a plate integrally formed with the wall of the hot air channel.
  • The present invention is further described below by referring to the accompanying drawings.
    • FIG. 1 is a schematic structural diagram of a drum and a condensing apparatus of a clothes dryer; and
    • FIG. 2 is a schematic diagram of a cross section along an A-A line in FIG. 1.
  • As shown in FIG. 1, a clothes dryer includes a drum 2, forming a drying chamber from clothes, a hot air channel 4, in spatial communication with the drum 2, and a fan 6, enabling air to circulate between the drum 2 and the hot air channel 4. The hot air channel 4 includes an inlet 41, located at a lower location and connected to the drum 2, and an outlet 42, located at a higher location and connected to the fan 6. A water supply apparatus 8 for feeding cooling water into the hot air channel 4 is disposed at a suitable location on the hot air channel 4 and higher than a horizontal centerline a1 of the hot air channel 4. The hot air channel 4 and the water supply apparatus 8 are main elements for forming a condensing apparatus 10.
  • As shown in FIG. 1 and FIG. 2, the hot air channel 4 includes a first wall 4a and a second wall 4b that face each other and that are relatively broad and a third wall 4c that connects the first wall 4a and the second wall 4b and that is relatively narrow. A first flow guide rib 11a is integrally formed on the first wall 4a, and a second flow guide rib 11b is integrally formed on the second wall 4b. The first flow guide rib 11a and the second flow guide rib 11b protrude toward an interior of the hot air channel 4, and meanwhile, are close to the third wall 4c that connects the first wall 4a and the second wall 4b. Hence, a cooling water flowing area 12 is formed on the first wall 4a, the second wall 4b, and the third wall 4c that use the first flow guide rib 11a and the second flow guide rib 11b as boundaries. Upper ends 111a and 111b of the first flow guide rib 11a and the second flow guide rib 11b are close to an outlet 81 of the water supply apparatus 8, and lower ends 112a and 112b thereof are close to the inlet 41 of the hot air channel. To make the cooling water enter the cooling water flowing area 12 more stable, the outlet 81 of the water supply apparatus is disposed toward the cooling water flowing area 12.
  • A baffle plate 14 integrally manufactured with the third wall 4c is disposed below the cooling water flowing area 12 and transversely extends from the third wall 4c toward the interior of the hot air channel 4. A side opposite to a side, on which the baffle plate 14 is connected to the third wall 4c, is a free end 141 extending toward a central area of a cross section of the hot air channel 4 in a suspended manner. Two other sides of the baffle plate 14 may be connected to the first wall 4a and the second wall 4b. In a process of falling down along the cooling water flowing area 12, the cooling water is blocked by the baffle plate 14, then, changes a flowing path, is transversely dispersed on a surface of the baffle plate 14, and falls into the central area of the cross section of the hot air channel 4 from the free end 141. On the other hand, the baffle plate 14 blocks hot air below, to cause turbulence of the hot air. The turbulent hot air meets the dispersed cooling water at a location of the baffle plate 14, and the two get in sufficient contact with each other, disturb each other, and perform heat exchange. The hot air channel 4 includes bend 43 proximal to the inlet 41. The baffle plate 14 is disposed at a bend joint 44. Air turbulence at the bend is stronger, and disposing the baffle plate 14 at the bend more beneficially utilizes a design feature of the hot air channel 4 and improves condensing efficiency.
  • The foregoing descriptions and various specific implementation manners shown in the accompanying drawings are merely used for describing the present invention rather than all of the present invention. Within the scope of the basic technical ideas of the present invention, a change made by a person of ordinary skill in related art to the present invention in any form shall fall within the protection scope of the present invention.

Claims (8)

  1. A clothes dryer comprising a condensing apparatus, wherein a condensing apparatus (10) comprises a hot air channel (4), in communication with a drying chamber (2), and a water supply apparatus (8), for feeding cooling water into the hot air channel, an inlet (41) of the hot air channel being located at a lower location, an outlet (42) of the hot air channel being located at a higher location, characterized in that: at least one flow guide rib (11a, 11b) is formed on a wall (4a, 4b, 4c, 4d) of the hot air channel, an upper end (111a, 111b) of the flow guide rib is close to an outlet (81) of the water supply apparatus, a lower end (112a, 112b) thereof is close to the inlet (41) of the hot air channel, and the flow guide rib (11a, 11b) and the wall (4a, 4b, 4c, 4d) of the hot air channel define a cooling water flowing area (12) together.
  2. The clothes dryer according to claim 1, characterized in that: the wall comprised by the hot air channel comprises a first wall (4a) and a second wall (4b) that face each other and that are relatively broad and a third wall (4c) that connects the first wall (4a) and the second wall (4b) and that is relatively narrow, a first flow guide rib (11a) is located on the first wall, a second flow guide rib (11b) is located on the second wall, and the cooling water flowing area (12) is formed on the first wall (4a), the second wall (4b), and the third wall (4c) that use the first flow guide rib (11a) and the second flow guide rib (11b) as boundaries.
  3. The clothes dryer according to claim 1, characterized in that: the outlet (81) of the water supply apparatus is higher than a horizontal centerline (a1) of the hot air channel, and is disposed toward the cooling water flowing area (12).
  4. The clothes dryer according to claim 1, characterized in that: a protruding structure (14) that transversely extends out is disposed below the cooling water flowing area (12).
  5. The clothes dryer according to claim 4, characterized in that: the protruding structure (14) extends out from the third wall (4c) toward an interior of the hot air channel (4) and comprises a free end (141) extending out toward a central area of a cross section of the hot air channel (4) in a suspended manner.
  6. The clothes dryer according to claim 5, characterized in that: the protruding structure (14) connects the first wall (4a) and the second wall (4b).
  7. The clothes dryer according to claim 5, characterized in that: the hot air channel (4) comprises a bend (43) proximal to the inlet (41), and the protruding structure (14) is disposed at a bend joint (44).
  8. The clothes dryer according to claim 4, characterized in that: the protruding structure is a plate (14) integrally formed with the wall (4a, 4b, 4c, 4d) of the hot air channel.
EP18165733.9A 2017-04-26 2018-04-04 Clothes dryer including condensing apparatus Active EP3396055B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL18165733T PL3396055T3 (en) 2017-04-26 2018-04-04 Clothes dryer including condensing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710281345.2A CN108797052B (en) 2017-04-26 2017-04-26 Clothes dryer comprising a condensation device

Publications (2)

Publication Number Publication Date
EP3396055A1 true EP3396055A1 (en) 2018-10-31
EP3396055B1 EP3396055B1 (en) 2020-11-18

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EP18165733.9A Active EP3396055B1 (en) 2017-04-26 2018-04-04 Clothes dryer including condensing apparatus

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CN (1) CN108797052B (en)
PL (1) PL3396055T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113143163A (en) * 2021-02-01 2021-07-23 佛山市顺德区美的洗涤电器制造有限公司 Hot air device and dish washing machine

Citations (4)

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Publication number Priority date Publication date Assignee Title
GB2172978A (en) * 1985-03-25 1986-10-01 Hotpoint Ltd Tumbler dryers and washing machines
GB2230330A (en) * 1989-04-10 1990-10-17 Balay Sa Drying device for washing machines
CN105544166A (en) * 2016-02-03 2016-05-04 海信（山东）冰箱有限公司 Water condensing device and washing and drying all-in-one machine
US20160369450A1 (en) * 2015-06-18 2016-12-22 Dongbu Daewoo Electronics Corporation Drying assembly and manufacturing method for the same

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
CN1782215A (en) * 2004-11-30 2006-06-07 乐金电子(天津)电器有限公司 Drum washing machine with drying function
CN201012991Y (en) * 2006-08-14 2008-01-30 南京乐金熊猫电器有限公司 Condensation channel of drying washing machine
CN104233737B (en) * 2013-06-21 2018-05-01 青岛海尔洗衣机有限公司 A kind of water condenser and washing-drying integral machine and clothes-drying method
CN105088627A (en) * 2014-04-22 2015-11-25 无锡小天鹅股份有限公司 Washing machine and condenser used for washing machine
CN106400432B (en) * 2015-07-29 2020-06-16 博西华电器（江苏）有限公司 Clothes dryer with condensing device and control method of condensing device of clothes dryer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2172978A (en) * 1985-03-25 1986-10-01 Hotpoint Ltd Tumbler dryers and washing machines
GB2230330A (en) * 1989-04-10 1990-10-17 Balay Sa Drying device for washing machines
US20160369450A1 (en) * 2015-06-18 2016-12-22 Dongbu Daewoo Electronics Corporation Drying assembly and manufacturing method for the same
CN105544166A (en) * 2016-02-03 2016-05-04 海信（山东）冰箱有限公司 Water condensing device and washing and drying all-in-one machine

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Publication number Publication date
CN108797052B (en) 2022-03-22
PL3396055T3 (en) 2021-06-14
EP3396055B1 (en) 2020-11-18
CN108797052A (en) 2018-11-13

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