CN108488438B - Fluid distributing valve - Google Patents
Fluid distributing valve Download PDFInfo
- Publication number
- CN108488438B CN108488438B CN201810352557.XA CN201810352557A CN108488438B CN 108488438 B CN108488438 B CN 108488438B CN 201810352557 A CN201810352557 A CN 201810352557A CN 108488438 B CN108488438 B CN 108488438B
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- Prior art keywords
- distribution
- plate
- air pressure
- disc
- liquid inlet
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Classifications
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/08—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks
- F16K11/085—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks with cylindrical plug
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
- F16K27/065—Construction of housing; Use of materials therefor of taps or cocks with cylindrical plugs
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/53—Mechanical actuating means with toothed gearing
- F16K31/535—Mechanical actuating means with toothed gearing for rotating valves
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Multiple-Way Valves (AREA)
Abstract
The invention discloses a fluid distribution valve, which comprises a central fixed shaft, a runner distribution disc and a rotating mechanism. The upper surface and the lower surface of the runner distribution plate are respectively provided with an upper feed liquid inlet plate and a lower feed liquid inlet plate. A plurality of liquid inlets are uniformly distributed on the side edge of the feeding liquid inlet disc, and a plurality of annular flow channels are uniformly distributed on the upper surface and the lower surface of the flow channel distribution disc along the radial direction respectively. The liquid inlet is communicated with the annular flow channels on the upper surface of the flow channel distribution plate in a one-to-one correspondence manner through a plurality of flow channel pipes, the bottom of the lower feed liquid inlet plate is communicated with a plurality of liquid inlet pipes in a sealing manner, and the liquid inlet pipes are communicated with the annular flow channels on the lower surface of the flow channel distribution plate in a one-to-one correspondence manner through a plurality of flow channel pipes. The invention provides a novel distributing valve structure capable of sequentially and continuously distributing a plurality of solutions to different containers through rotation, realizing continuous fluid distribution, achieving the purpose of continuous production, having no complex turntable system, being suitable for more compact sites and having low installation, maintenance and operation costs.
Description
Technical Field
The invention belongs to the technical field of fluid distribution, and particularly relates to a fluid distribution valve.
Background
There are two general categories of ion exchange systems currently on the market, the first: the electromagnetic valve group is combined and controlled to distribute materials to achieve the simulation effect of the moving bed, and the electromagnetic valve group comprises a complex electromagnetic valve group and a control system, and is difficult to realize complex process control; the second category: the ion exchange valve core and the resin column are driven to rotate through the turntable system, so that continuous distribution of materials is realized to realize a moving bed simulation effect, and the ion exchange equipment has a complex turntable system, so that production, installation, debugging and maintenance of the ion exchange equipment are more complex, the cost is relatively high, and full-automatic operation is difficult to realize. Therefore, a third generation ion exchange device which can discard a complicated turntable system and can easily realize full-automatic production is generated.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a novel dispensing valve structure capable of sequentially and continuously dispensing several solutions to different containers by rotation, which eliminates the conventional complicated turntable system and can easily realize full-automatic production.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a fluid dispensing valve includes a stationary central stationary shaft, a flow path dispensing disc disposed about the central stationary shaft and rotatable, and a rotating mechanism for rotating the flow path dispensing disc. The upper surface and the lower surface of the runner distribution plate are respectively and closely attached to an upper feed liquid inlet plate and a lower feed liquid inlet plate. The feeding liquid inlet plate is characterized in that a plurality of liquid inlets are uniformly distributed on the side edge of the feeding liquid inlet plate in the circumferential direction, a plurality of annular flow channels are uniformly distributed on the upper surface and the lower surface of the flow channel distribution plate in the radial direction respectively, and the liquid inlets are communicated with the annular flow channels on the upper surface of the flow channel distribution plate in a one-to-one correspondence manner through a plurality of flow channel pipes arranged in the feeding liquid inlet plate. The bottom of the feed liquid inlet disc is communicated with a plurality of feed liquid pipes in a sealing way, and the feed liquid pipes are communicated with the annular flow passages on the lower surface of the flow passage distribution disc in a one-to-one correspondence way through a plurality of flow passage pipes arranged in the feed liquid inlet disc. The side edges of the runner distribution plate are circumferentially and uniformly provided with a plurality of external connection pipes, and the external connection pipes are communicated with the annular runners in a one-to-one correspondence manner through a plurality of runner pipes arranged in the runner distribution plate. The other end of the outer connecting pipe is connected to the distribution plate, and the outer connecting pipe, the runner distribution plate and the rotating mechanism are linked.
Further, the rotating mechanism comprises a gear disc and a sealing material disc linked with the gear disc, and the runner distribution disc is fixedly connected with the gear disc through a force transmission flange. The sealing material disc is fixedly positioned on the lower surface of the gear disc through pins, a plurality of runner holes are uniformly distributed on the sealing material disc along the circumferential direction, and the external connection pipes penetrate through the gear disc and are in one-to-one butt joint with the runner holes.
Further, a fixed disk is arranged below the rotating mechanism, a distribution disk is arranged above the fixed disk, and the distribution disk is fixed on the fixed disk through pin positioning. The bottom of the fixed disc is uniformly distributed with a plurality of distributing pipes along the circumferential direction, the distributing disc is uniformly distributed with a plurality of distributing holes at the opposite positions of the distributing pipes, the distributing pipes penetrate through the fixed disc and are in one-to-one butt joint with the distributing holes, and the distribution of the distributing holes is completely consistent with the distribution of the runner holes.
Further, the fluid distribution valve further comprises an air pressure sealing device for pressing the feed liquid conveying disc and the runner distribution disc, the air pressure sealing device comprises an air pressure disc, and a through hole for the central fixing shaft to pass through is formed in the center of the air pressure disc. The air pressure plate is provided with an annular air pressure inner cavity towards one side of the flow passage distribution plate, an air pressure inner plate with the same shape as the air pressure inner cavity is arranged in the air pressure inner cavity, and the annular surfaces of the air pressure inner plate and the air pressure inner cavity are sealed through a sealing assembly. The air pressure disc is provided with a plurality of air inlet pipelines communicated with the air pressure inner cavity.
The sealing assembly comprises a V-shaped sealing ring and an O-shaped sealing ring.
Wherein, the top of the air pressure disc is provided with an air pressure gauge for detecting the air pressure intensity of the air pressure cavity.
The top of the air pressure disc is provided with a pressing disc for pressing the whole fluid distribution valve downwards, and the bottom of the feed liquid inlet disc is provided with a supporting disc. One end of the central fixed shaft is fixed on the pressing disc through a first fastener, and the other end of the central fixed shaft is fixed on the supporting disc through a second fastener.
Further, sealing ring grooves are respectively arranged between the connected annular flow passages, sealing rings are arranged in the sealing ring grooves, and isolation sealing is realized between the connected annular flow passages through the sealing rings. The upper feed liquid inlet disc and the lower feed liquid inlet disc are provided with annular grooves matched with the sealing rings in shape on the surfaces matched with the runner distribution discs.
The invention has the following beneficial effects: the novel distributing valve structure can sequentially and continuously distribute a plurality of solutions to different containers through rotation, realizes continuous fluid distribution, achieves the purpose of continuous production, has no complicated turntable system, can adapt to more compact sites, and has low production, installation, maintenance and operation costs.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is an exploded view of the part of the present invention.
FIG. 3 is a schematic perspective view of the feed liquid inlet plate.
Fig. 4 is a schematic perspective view of a feed liquid inlet plate.
Fig. 5 is a schematic perspective view of a flow path distribution plate.
Fig. 6 is a schematic structural view of the air pressure sealing device.
Description of main reference numerals: 1. a central fixed shaft; 11. a first fastener; 12. a second fastener; 2. a flow channel distribution plate; 201. a seal ring; 21. an upper surface annular flow passage; 22. a lower surface annular flow passage; 23. a flow channel tube; 31. a gear plate; 32. a sealing material tray; 321. a flow passage hole; 33. a force transfer flange; 401. a V-shaped sealing ring; 402. an O-shaped sealing ring; 41. an air pressure plate; 411. an air intake line; 412. an air pressure gauge; 413. an air pressure cavity; 51. a feeding liquid inlet disc; 511. a liquid inlet; 512. an annular groove; 513. a flow channel tube; 52. a feed liquid inlet disc; 521. a liquid inlet pipe; 522. an annular groove; 523. a flow channel tube; 6. an outer connecting pipe; 7. a fixed plate; 71. a dispensing tube; 8. a distribution tray; 81. a dispensing orifice; 9. the compressing disc.
Detailed Description
The invention will be further described with reference to the drawings and detailed description.
As shown in fig. 1 to 5, a fluid distribution valve comprises a stationary central fixed shaft 1, a flow path distribution plate 2 rotatably disposed around the central fixed shaft 1, a rotation mechanism for rotating the flow path distribution plate 2, and an air pressure sealing device for pressure sealing the entire fluid distribution valve.
The upper surface and the lower surface of the runner distribution plate 2 are respectively closely attached with an upper feed liquid inlet plate 51 and a lower feed liquid inlet plate 52, a plurality of feed liquid inlets 511 are uniformly distributed on the side edge of the upper feed liquid inlet plate 51 in the circumferential direction, a plurality of annular runners 21 are uniformly distributed on the upper surface of the runner distribution plate 2 in the radial direction, and a plurality of annular runners 22 are uniformly distributed on the lower surface in the radial direction. Seal ring grooves are respectively arranged between the connected annular runners 21 (22), seal rings 201 are arranged in the seal ring grooves, annular grooves 511 matched with the seal rings 201 in shape are formed on the surfaces of the upper feed liquid inlet discs 51 matched with the runner distribution discs 2, and annular grooves 512 matched with the seal rings 201 in shape are formed on the surfaces of the lower feed liquid inlet discs 52 matched with the runner distribution discs 2. The liquid inlets 511 are communicated with the annular flow channels 21 on the upper surface of the flow channel distribution plate 2 in a one-to-one correspondence manner through a plurality of flow channel pipes 513 arranged in the upper liquid inlet plate 51. The bottom of the lower feed liquid inlet disc 52 is communicated with a plurality of feed liquid pipes 521 in a sealing way, and the feed liquid pipes 521 are communicated with the annular flow passages 22 on the lower surface of the flow passage distribution disc 2 in a one-to-one correspondence way through a plurality of flow passage pipes 523 arranged in the lower feed liquid inlet disc 52. The side edges of the runner distribution plate 2 are circumferentially and uniformly provided with a plurality of external connection pipes 6, and the external connection pipes 6 are communicated with the upper surface annular runner 21 and the lower surface annular runner 22 of the runner distribution plate 2 in a one-to-one correspondence manner through a plurality of runner pipes 23. The other end of the outer connecting pipe 6 is connected to a distribution plate 8, and the outer connecting pipe 6, the runner distribution plate 2 and the rotating mechanism are linked.
The rotating mechanism comprises a gear plate 31 and a sealing material plate 32 linked with the gear plate 31, the runner distribution plate 2 is fixedly connected with the gear plate 31 through a force transmission flange 33, the sealing material plate 32 is fixedly positioned on the lower surface of the gear plate 31 through pins, a plurality of runner holes 321 are uniformly distributed on the sealing material plate 32 along the circumferential direction, and the external connection pipes 6 penetrate through the gear plate 31 and are in one-to-one butt joint with the runner holes 321. A fixed disk 7 is arranged below the rotating mechanism, a distribution disk 8 is arranged above the fixed disk 7, and the distribution disk 8 is fixed on the fixed disk 7 through pin positioning. The bottom of the fixed disc 7 is uniformly and fixedly provided with a plurality of distribution pipes 71 along the circumferential direction, the distribution disc 7 is uniformly and uniformly provided with a plurality of distribution holes 81 at the positions opposite to the distribution pipes 71, the distribution pipes 71 penetrate through the fixed disc 7 and are in one-to-one butt joint with the distribution holes 81, and the distribution of the distribution holes 81 is completely consistent with the distribution of the runner holes 321.
As shown in fig. 6, the air pressure sealing device comprises an air pressure disc 41, a through hole for the central fixed shaft 1 to pass through is formed in the center of the air pressure disc 41, an annular air pressure inner cavity 413 is formed on one side of the air pressure disc 41, facing the flow passage distribution disc 2, and an air pressure inner plate 42 with the same shape as the air pressure inner cavity 413 is arranged in the air pressure inner cavity 413. The air pressure inner plate 42 and the annular surface of the air pressure inner cavity 413 are sealed by a V-shaped sealing ring 401 and an O-shaped sealing ring 402. The air pressure disc 41 is provided with a plurality of air inlet pipelines 411 communicated with an air pressure inner cavity 413, and the top of the air pressure disc 41 is provided with an air pressure gauge 412 for detecting the air pressure intensity of the air pressure inner cavity 413. The top of the air pressure disc 41 is provided with a compressing disc 9 for integrally compressing and sealing the fluid distribution valve, the bottom of the lower feed liquid inlet disc 52 is provided with a supporting disc 10, one end of the central fixed shaft 1 is fixed on the compressing disc 9 through a first fastening piece 11, and the other end is fixed on the supporting disc 10 through a second fastening piece 12.
The working principle of the invention is as follows: the precise linkage of the novel fluid distribution valve rotating device is realized by controlling the stroke of the rotating mechanism; the outer connection pipes 6 which are communicated with the annular flow passages 21 (22) one by one in the rotation process always keep single materials through the annular flow passages 21 (22) in the flow passage distribution plate 2 which are communicated with the liquid inlets 511 (liquid inlet pipes 521) one by one; the material in the external pipe 6 which is communicated with the annular flow channels 21 (22) in one-to-one correspondence is rotated to different outlets one by one along with the rotation through the relative displacement of the sealing disc 32 and the outlet disc 8, and the distribution of the material is realized through the device.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A fluid dispensing valve, characterized by: the rotary type flow channel distributor comprises a static center fixed shaft, a flow channel distribution plate which is arranged around the center fixed shaft and can rotate, and a rotary mechanism which is used for driving the flow channel distribution plate to rotate, wherein an upper surface and a lower surface of the flow channel distribution plate are respectively closely attached to an upper feed liquid inlet plate and a lower feed liquid inlet plate, a plurality of liquid inlets are uniformly distributed on the side edge of the upper feed liquid inlet plate in the circumferential direction, a plurality of annular flow channels are uniformly distributed on the upper surface and the lower surface of the flow channel distribution plate in the radial direction respectively, the liquid inlets are in one-to-one communication with the annular flow channels on the upper surface of the flow channel distribution plate through a plurality of flow channel pipes arranged in the upper feed liquid inlet plate, a plurality of liquid inlet pipes are in sealed communication with the bottom of the lower feed liquid inlet plate, the liquid inlet pipes are in one-to-one communication with the annular flow channels on the lower surface of the flow channel distribution plate through a plurality of flow channel pipes arranged in the lower feed liquid inlet plate, the side edge of the flow channel distribution plate is in circumferential direction and is in one-to-one communication with the annular flow channels, and the other ends of the outer connecting pipes are connected to the distribution plate, and the rotary mechanism is in linkage with the flow channels.
2. A fluid dispensing valve in accordance with claim 1 in which: the rotating mechanism comprises a gear plate and a sealing material plate linked with the gear plate, the runner distribution plate is fixedly connected with the gear plate through a force transmission flange, the sealing material plate is fixedly positioned on the lower surface of the gear plate through pins, a plurality of runner holes are uniformly distributed on the sealing material plate along the circumferential direction, and external pipes penetrate through the gear plate and are in one-to-one butt joint with the runner holes.
3. A fluid dispensing valve in accordance with claim 2 in which: the rotary mechanism below install the fixed disk, the top of fixed disk is equipped with the distribution dish, the distribution dish pass through the pin location and fix on the fixed disk, the fixed disk bottom set firmly along circumference equipartition a plurality of distribution pipes, the distribution dish be in the equipartition on the position that the distribution pipe is relative be equipped with a plurality of distribution hole, the distribution pipe pass the fixed disk and with the distribution hole butt joint one by one, the distribution of distribution hole with the distribution of runner hole is unanimous completely.
4. A fluid dispensing valve in accordance with claim 1 in which: the device also comprises an air pressure sealing device for pressing the feed liquid conveying disc and the runner distribution disc, the air pressure sealing device comprises an air pressure disc, a through hole for the central fixed shaft to pass through is arranged at the center of the air pressure disc, an annular air pressure inner cavity is arranged at one side of the air pressure disc, which faces the runner distribution disc, the air pressure inner cavity is internally provided with an air pressure inner plate which has the same shape as the air pressure inner cavity, the annular surfaces of the air pressure inner plate and the air pressure inner cavity are sealed by a sealing assembly, and the air pressure disc is provided with a plurality of air inlet pipelines which are communicated with the air pressure inner cavity.
5. A fluid dispensing valve in accordance with claim 4 in which: the sealing assembly comprises a V-shaped sealing ring and an O-shaped sealing ring.
6. A fluid dispensing valve in accordance with claim 4 in which: the top of the air pressure disc is provided with an air pressure gauge for detecting the air pressure intensity of the air pressure inner cavity.
7. A fluid dispensing valve in accordance with claim 4 in which: the top of the air pressure disc is provided with a pressing disc for pressing the fluid distribution valve downwards, the bottom of the lower feed liquid inlet disc is provided with a supporting disc, one end of the central fixing shaft is fixed on the pressing disc through a first fastening piece, and the other end of the central fixing shaft is fixed on the supporting disc through a second fastening piece.
8. A fluid dispensing valve in accordance with claim 1 in which: and sealing ring grooves are respectively arranged between the connected annular flow passages, sealing rings are arranged in the sealing ring grooves, isolation sealing is realized between the connected annular flow passages through the sealing rings, and annular grooves matched with the sealing rings in shape are formed in the surfaces of the upper feed liquid inlet disk and the lower feed liquid inlet disk, which are matched with the flow passage distribution disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810352557.XA CN108488438B (en) | 2018-04-19 | 2018-04-19 | Fluid distributing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810352557.XA CN108488438B (en) | 2018-04-19 | 2018-04-19 | Fluid distributing valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108488438A CN108488438A (en) | 2018-09-04 |
| CN108488438B true CN108488438B (en) | 2023-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810352557.XA Active CN108488438B (en) | 2018-04-19 | 2018-04-19 | Fluid distributing valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN108488438B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110665549B (en) * | 2019-09-20 | 2024-05-24 | 厦门世达膜科技有限公司 | Continuous ion exchange equipment with combined slip ring |
| CN110735267A (en) * | 2019-10-22 | 2020-01-31 | 佛山市南海天富科技有限公司 | dye automatic weighing and chemical material distribution system |
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| GB761690A (en) * | 1953-05-07 | 1956-11-21 | Fond Debard | Improvements in valve apparatus for distributing at least one fluid, and in particular air, to a plurality of fluid-operated devices |
| FR1340205A (en) * | 1962-06-28 | 1963-10-18 | Sferma | Pressurized fluid dispenser |
| RU2115051C1 (en) * | 1996-06-25 | 1998-07-10 | Махир Зафар оглы Шарифов | Multi-pass cock |
| WO2006036062A1 (en) * | 2004-09-30 | 2006-04-06 | Outokumpu Technology Oyj | Rotary distributor valve for chemical/physical treatment of a fluid |
| CN101802515A (en) * | 2007-06-19 | 2010-08-11 | 丹佛斯公司 | An expansion valve with a distributor |
| CN204437367U (en) * | 2015-01-14 | 2015-07-01 | 上海浦东汉威阀门有限公司 | 24 way rotary valves |
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| CN208311549U (en) * | 2018-04-19 | 2019-01-01 | 厦门世达膜科技有限公司 | A kind of dispensing valve |
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| US6874436B2 (en) * | 2003-01-24 | 2005-04-05 | American Soil Technologies, Inc. | Fluid distribution assembly |
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| US20140209828A1 (en) * | 2013-01-31 | 2014-07-31 | Belimo Holding Ag | Flow characterizing device and ball valve with such a flow characterizing device |
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| GB761690A (en) * | 1953-05-07 | 1956-11-21 | Fond Debard | Improvements in valve apparatus for distributing at least one fluid, and in particular air, to a plurality of fluid-operated devices |
| FR1340205A (en) * | 1962-06-28 | 1963-10-18 | Sferma | Pressurized fluid dispenser |
| RU2115051C1 (en) * | 1996-06-25 | 1998-07-10 | Махир Зафар оглы Шарифов | Multi-pass cock |
| WO2006036062A1 (en) * | 2004-09-30 | 2006-04-06 | Outokumpu Technology Oyj | Rotary distributor valve for chemical/physical treatment of a fluid |
| CN101802515A (en) * | 2007-06-19 | 2010-08-11 | 丹佛斯公司 | An expansion valve with a distributor |
| CN204437367U (en) * | 2015-01-14 | 2015-07-01 | 上海浦东汉威阀门有限公司 | 24 way rotary valves |
| CN204942585U (en) * | 2015-08-10 | 2016-01-06 | 深圳市嘉润精密模具有限公司 | A kind of fluid supplying structure of rotational motion mechanism |
| CN208311549U (en) * | 2018-04-19 | 2019-01-01 | 厦门世达膜科技有限公司 | A kind of dispensing valve |
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| CN108488438A (en) | 2018-09-04 |
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Application publication date: 20180904 Assignee: Xiamen Shida membrane Engineering Co.,Ltd. Assignor: XIAMEN STARMEM TECHNOLOGY CO.,LTD. Contract record no.: X2021980014821 Denomination of invention: A fluid distribution valve License type: Exclusive License Record date: 20211221 |
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