CN112393354A - Internal and external circulation fresh air system and operation mode thereof - Google Patents
Internal and external circulation fresh air system and operation mode thereof Download PDFInfo
- Publication number
- CN112393354A CN112393354A CN202011317469.XA CN202011317469A CN112393354A CN 112393354 A CN112393354 A CN 112393354A CN 202011317469 A CN202011317469 A CN 202011317469A CN 112393354 A CN112393354 A CN 112393354A
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- Prior art keywords
- filter screen
- circulation
- fresh air
- air inlet
- shell
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/007—Ventilation with forced flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
- F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/28—Arrangement or mounting of filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/56—Heat recovery units
Abstract
An internal and external circulation fresh air system and an operation mode thereof, the system comprises a shell, wherein a fresh air inlet is arranged at the bottom of the shell, a fresh air outlet is arranged at the top of the shell, an air inlet is arranged on the side surface of the lower part of the shell, an air outlet is arranged on the side surface of the upper part of the shell, a movable baffle plate for opening and closing the air inlet and separating the fresh air inlet and the air inlet is arranged at the air inlet, a heat exchanger is arranged in the shell, an internal circulation middle-effect filter screen is arranged between the fresh air inlet and the heat exchanger, a primary-effect filter screen and a dual-circulation middle-effect filter; the casing is provided with a discharge fan and a suction fan above the heat exchanger, the discharge fan is positioned below the air outlet, and a high-efficiency filter screen is arranged between the suction fan and the heat exchanger. The fresh air system can perform indoor circulation and indoor and outdoor simultaneous circulation, and is simple in structure and low in cost.
Description
Technical Field
The invention relates to a fresh air system for indoor and outdoor air circulation, and belongs to the technical field of air circulation.
Background
The fresh air system for indoor and outdoor air circulation is necessary to solve the problems of air quality reduction and air turbidity in a closed space.
Various fresh air systems are currently available. CN111829128A discloses a new trend system, including the main tank body, one side of main tank body is provided with a pair of mouth of pipe, be indoor fresh air inlet and indoor return air inlet respectively, the main tank body corresponds in the one side of keeping away from indoor fresh air inlet and is provided with outdoor air outlet, and correspond in the one side of keeping away from indoor return air inlet and be provided with outdoor air intake, the inside center fixed mounting of main tank body has the heat exchange core, the heat exchange core is provided with four connectors, and all be connected with the linking air pipe on four connectors, the linking air pipe respectively with indoor fresh air inlet, indoor return air inlet, outdoor air outlet and outdoor air intake communicate each other.
CN111765586A discloses a fresh air system, which comprises a switch, an air inlet pipeline and an air outlet pipeline are fixedly connected on the switch, the utility model discloses a ventilation system, including air-supply line, blast pipe and indoor roof fixed connection, the lateral wall fixedly connected with a plurality of air supply branch pipe of blast pipe, every air supply branch pipe all with indoor roof fixed connection, the one end that the blast pipe was kept away from to a plurality of air supply branch pipe is located indoor different room respectively, every air supply branch pipe all communicates with the air-supply line through the blast pipe, the one end that the blast pipe was kept away from to every air supply branch pipe is provided with dehydrating unit, air-out pipeline fixedly connected with exhaust column, exhaust column and indoor wall body fixed connection, a plurality of convulsions branch pipe of exhaust column fixedly connected with, every convulsions branch pipe all communicates with the air-out pipeline through the exhaust column, the one end that the exhaust column was kept away from to every.
CN111623465A discloses a new trend system, which comprises a housing, two sets of filtering mechanism and two sets of mechanisms of taking a breath, the inside division board that is equipped with of shell is cut apart its inner space, two sets of filtering mechanism install respectively in the division board both sides, shell rear end and front end are close to the mechanism of taking a breath input department and all are equipped with the air intake, shell front end and rear end are close to division board department and all are provided with the air outlet, two sets of filtering mechanism all can be dismantled and install inside the shell, and separate through the division board, the inside circuit board that is equipped with of.
The fresh air system generally only has independent indoor and indoor-outdoor double circulation, the indoor circulation and the indoor-outdoor double circulation are not combined, and the efficiency and the effect of air circulation are to be improved.
Disclosure of Invention
The invention provides an internal and external circulation fresh air system which can realize indoor circulation and indoor and outdoor double circulation, has a heating function and has better filtering effect to overcome the defects of the existing fresh air system.
The internal and external circulation fresh air system adopts the technical scheme that:
the internal and external circulation fresh air system comprises a shell, wherein a fresh air inlet is formed in the bottom of the shell, a fresh air outlet is formed in the top of the shell, an air inlet is formed in the side surface of the lower part of the shell, an air outlet is formed in the side surface of the upper part of the shell, a movable baffle plate used for opening and closing the air inlet and separating the fresh air inlet and the air inlet is arranged at the air inlet, a heat exchanger is arranged in the shell, an internal circulation middle-effect filter screen is arranged between the fresh air inlet and the heat exchanger, a primary-effect filter screen and a dual-circulation middle-effect filter screen; the casing is provided with a discharge fan and a suction fan above the heat exchanger, the discharge fan is positioned below the air outlet, and a high-efficiency filter screen is arranged between the suction fan and the heat exchanger.
The movable baffle is connected to a rotating shaft of the inner circulation control motor, and the inner circulation control motor is installed in the shell.
The primary filter screen is the filter screen of G or F grade, and the medium efficiency filter screen is the filter screen of grade more than H10, and high-efficient filter screen is the filter screen of grade more than H12.
An electric auxiliary heating device is also arranged between the suction fan and the heat exchanger. The electric auxiliary heating device adopts a PTC ceramic heater for heating air sent into a room.
The heat exchanger adopts a dividing wall type heat exchanger in the prior art and is used for heating the heat of the air exhausted from the outdoor into the temperature of the air sent into the indoor through heat exchange.
And an activated carbon filter screen is arranged above the high-efficiency filter screen to filter harmful gases.
The high-pressure particle sterilization device is arranged below the suction fan in the shell, so that the air is further purified. The high-pressure particle sterilization device is the prior art and is used for treating harmful substances such as bacteria, viruses and the like in the air.
Above-mentioned new trend system inhales the fan during application and is in indoor one side, and exhaust fan is in outdoor one side, both can carry out indoor circulation, can carry out indoor outdoor while circulating again, and concrete process is:
1. when indoor circulation is carried out: the air inlet is closed through the movable baffle, the suction fan is opened, indoor air is sucked into the shell through the fresh air inlet, sequentially passes through the internal circulation middle-effect filter screen, the heat exchanger, the high-effect filter screen and the like, and enters the room again through the fresh air outlet, so that the purification of the indoor air is completed.
2. When indoor and outdoor simultaneous circulation is performed: opening the air inlet, and simultaneously starting the suction fan and the discharge fan; indoor air is sucked into the shell, passes through the internal circulation medium-efficiency filter screen and the heat exchanger in sequence and is exhausted out of the room through the air outlet; outdoor air sequentially passes through the primary filter screen, the dual-cycle intermediate filter screen, the heat exchanger, the high-efficiency filter screen and the like and enters the room from the fresh air outlet; the air in and out of the room is merged at the heat exchanger, and the temperature is neutralized to a certain degree, so that the temperature of the air in and out of the room is increased by a small amplitude.
The internal and external circulation fresh air system disclosed by the invention realizes the filtration of air by utilizing simpler structures such as a filter screen and a heat exchanger, has a simple structure, lower cost and good air filtration effect, and has strong market competitiveness.
The invention has the following characteristics:
1. simple structure and low manufacturing cost.
2. Can realize two modes of indoor circulation and indoor and outdoor double circulation.
3. The electric auxiliary heat can heat the outdoor air.
Drawings
Fig. 1 is a sectional view showing the overall structure of the internal and external circulation fresh air system of the present invention.
In the figure: 1. the heat exchanger, 2, high-efficiency filter screen, 3, electric auxiliary heating device, 4, fresh air outlet, 5, suction fan, 6, electric cabinet, 7, air outlet, 8, bracket, 9, double-circulation middle-effect filter screen, 10, primary-effect filter screen, 11, air inlet; 12. the air conditioner comprises an internal circulation control motor, 13 baffle plates, 14 internal circulation middle effect filter screens, 15 fresh air inlets, 16 exhaust fans and 17 shells.
Detailed Description
As shown in fig. 1, the internal and external circulation fresh air system of the present invention includes a housing 17, a fresh air inlet 15 is disposed at the bottom of the housing 17, an air inlet 11 is disposed at the lower side of the housing 17, and a baffle 13 is disposed at one side of the air inlet 11. The baffle 13 is connected to a rotating shaft of the inner circulation control motor 12 (fixedly installed in the housing 17), the inner circulation control motor 12 drives the baffle 13 to rotate to close or open the air inlet 11, when the air inlet 11 is opened, the fresh air inlet 15 and the air inlet 11 are separated, and a channel between the fresh air inlet 15 and the air inlet 11 is sealed. The heat exchanger 1 is arranged above the fresh air inlet 15 and the air inlet 11 through the support 8, the inner circulation middle effect filter screen 14 is arranged between the fresh air inlet 15 and the heat exchanger 1, the primary effect filter screen 10 and the double circulation middle effect filter screen 9 are arranged between the air inlet 11 and the heat exchanger 1, and the primary effect filter screen 10 is arranged below the double circulation middle effect filter screen 9. A driving chamber is provided above the heat exchanger 1 in the casing 17, a discharge fan 16 is provided on the left side of the driving chamber, and an air outlet 7 is provided on the side wall of the casing 17 above the discharge fan 16. A suction fan 5 is arranged on the right side of the driving chamber, and a high-efficiency filter screen 2 and an electric auxiliary heating device 3 are arranged between the lower part of the suction fan 5 and the heat exchanger 1. An active carbon filter screen (not shown) can be additionally arranged above the high-efficiency filter screen 2. The top of the shell 17 is provided with a fresh air outlet 4 above the suction fan 5. The upper portion of shell 17 still is provided with electric cabinet 6, and electrical components all is connected with electric cabinet 6, by electric cabinet 6 control each electronic or electrical components operation.
The main function of each filter screen is to filter air impurities and convey clean fresh air indoors. The method comprises the following steps that outside air firstly passes through a primary filter screen to filter large particles, protects a rear filter screen, prolongs the service life of other filter screens, passes through a middle-effect filter screen to filter medium-sized particles, and then passes through a high-efficiency filter screen to filter PM2.5 fine particles; and finally, filtering harmful gases such as external formaldehyde peculiar smell and the like through an activated carbon filter screen. The filter screens of G or F grades are selected as primary filter screens, the filter screens of H10-H14 grades are selected as intermediate filter screens, the filter screens of H12 grades are selected as high-efficiency filter screens, and the filter screens of HEPA H10 grades have good filtering effect on PM2.5, generally more than 95%.
The electric auxiliary heating device 3 uses a safe PTC (ceramic semiconductor) ceramic heater, which is used to heat the cold air sent into the room from the outside to a comfortable temperature. When the outdoor temperature is lower than 0 ℃ in winter, condensate and even ice easily appear in the equipment. The electric auxiliary heating function is added, so that cold air fed into the room is heated, the indoor temperature is raised, and people feel comfortable. The PTC ceramic heater is typically hidden within the device and the user can only see the heating unit after the device is turned off and the filter screen is removed. When the outdoor air is higher than the heating temperature set by the user, the electric auxiliary heating function can not be started generally, and only under the condition that the outdoor air is low, the electric auxiliary heating function can be started.
The heat exchanger 1 adopts a 'dividing wall type heat exchanger' which has compact size and simple principle in the prior art, and heats the temperature of the wind sent into the room by using the heat of the air exhausted from the outdoor. The heat exchanger 1 is used only in bi-directional flow (both supply and exhaust) to prevent indoor heat from being removed with exhaust. The heat exchanger 1 (dividing wall type heat exchanger) is a special structure composed of parallel tinfoil layers, and two kinds of air flows flow between tinfoil layers made of specially selected materials: cool outside air enters the room, while warm room air is exhausted to the outside. The two fluids meet in the heat exchanger, exchanging heat, but do not mix together.
A high-voltage particle sterilization device (not shown in the figure) can be additionally arranged at the position of the electric auxiliary heating device 3 to further purify the air. The high-voltage particle sterilization device can sterilize air sent into the room outdoors, and the particulate matter is adsorbed on the positive plate or the negative plate under the action of a high-voltage strong electric field by utilizing the principle of high-voltage electrostatic adsorption. And simultaneously, harmful substances such as bacteria and viruses in the air are treated.
When the air conditioner is used, the fresh air inlet 15 at the bottom of the shell 17 and the fresh air outlet 4 at the top of the shell 17 are positioned indoors (not communicated with the outside), the air inlet 11 at the side surface of the lower part of the shell 17 and the air outlet 7 at the upper part are communicated with the outdoor atmosphere directly or through a pipeline, the suction fan 5 is positioned indoors, and the exhaust fan 16 is positioned outdoors.
The process of realizing indoor circulation and indoor and outdoor double circulation by the fresh air system is as follows.
1. Indoor cyclic process
The internal circulation control motor 12 controls the baffle 13 to block the air inlet 11, the exhaust fan 16 is closed, the suction fan 5 is started, and external air (indoor air) enters from the bottom fresh air inlet 15, sequentially passes through the internal circulation middle effect filter screen 14, the heat exchanger 1, the high efficiency filter screen 2 and the electric auxiliary heat device 3, and finally enters into a room from the fresh air outlet 4.
2. Indoor and outdoor double circulation process
The internal circulation control motor 12 controls the baffle 13 to be vertical, the air inlet 11 is opened, meanwhile, the baffle 13 also seals a channel between the fresh air inlet 15 and the air inlet 11, and the fresh air inlet 15 is separated from the air inlet 11. The exhaust fan 16 and the suction fan 5 are simultaneously activated to perform a double circulation of air from the outside into the room and air from the inside out of the room.
The process of air entering the room from the outside is as follows:
the operation of suction fan 5 is inhaled outdoor air by air intake 14 and is inhaled, and the 3 devices of first effect filter screen 10, dual cycle middle effect filter screen 9, heat exchanger 1, high-efficient filter screen 2 and electricity are assisted in proper order, and first effect filter screen 10 filters for the first time, and dual cycle middle effect filter screen 9 further filters, and heat exchanger 1 heats, and high-efficient filter screen 2 further filters, and electricity is assisted device 3 and is heated, and it is indoor to discharge from new trend export 4.
The process of air being exhausted from the room to the outside is as follows:
the exhaust fan 16 sucks indoor air from the fresh air inlet 15, the indoor air sequentially passes through the internal circulation middle effect filter screen 14, the heat exchanger 1 and the exhaust outlet 7, the internal circulation middle effect filter screen 14 filters impurities, the heat exchanger 1 transfers heat, and the heat is exhausted outdoors through the exhaust outlet 10.
In the indoor and outdoor dual cycle mode, cold outside air enters the room and warm room air is exhausted to the outside, and the two fluids are joined in the heat exchanger to exchange heat but are not mixed together. The air entering the room is not too low in temperature to affect the life of people.
Claims (9)
1. The utility model provides an inside and outside circulation new trend system which characterized by: the novel air conditioner comprises a shell, wherein a fresh air inlet is formed in the bottom of the shell, a fresh air outlet is formed in the top of the shell, an air inlet is formed in the side surface of the lower portion of the shell, an air outlet is formed in the side surface of the upper portion of the shell, a movable baffle plate used for opening and closing the air inlet and separating the fresh air inlet and the air inlet is arranged at the air inlet, a heat exchanger is arranged in the shell, an internal circulation middle-effect filter screen is arranged between the fresh air inlet and the heat exchanger, a primary-effect filter screen and a dual-circulation middle-effect; the casing is provided with a discharge fan and a suction fan above the heat exchanger, the discharge fan is positioned below the air outlet, and a high-efficiency filter screen is arranged between the suction fan and the heat exchanger.
2. The inside-outside circulation fresh air system according to claim 1, wherein: the movable baffle is connected to a rotating shaft of the inner circulation control motor, and the inner circulation control motor is installed in the shell.
3. The inside-outside circulation fresh air system according to claim 1, wherein: the primary filter screen is the filter screen of G or F grade, and the medium efficiency filter screen is the filter screen of grade more than H10, and high-efficient filter screen is the filter screen of grade more than H12.
4. The inside-outside circulation fresh air system according to claim 1, wherein: an electric auxiliary heating device is arranged between the suction fan and the heat exchanger.
5. The inside-outside circulation fresh air system according to claim 4, wherein: the electric auxiliary heating device adopts a PTC ceramic heater.
6. The inside-outside circulation fresh air system according to claim 1, wherein: the heat exchanger adopts a dividing wall type heat exchanger.
7. The inside-outside circulation fresh air system according to claim 1, wherein: and an activated carbon filter screen is arranged above the high-efficiency filter screen.
8. The inside-outside circulation fresh air system according to claim 1, wherein: and a high-pressure particle sterilization device is arranged below the suction fan in the shell.
9. An operating mode of the internal and external circulation fresh air system as claimed in any one of claims 1 to 8, which is characterized in that: the suction fan is arranged at one indoor side, the discharge fan is arranged at one outdoor side, indoor circulation or indoor and outdoor simultaneous circulation is carried out, and the specific process is as follows:
(1) when indoor circulation is carried out: the air inlet is closed through the movable baffle, the suction fan is started, indoor air is sucked into the shell through the fresh air inlet, sequentially passes through the internal circulation medium-efficiency filter screen, the heat exchanger, the high-efficiency filter screen and the like, and enters the room again through the fresh air outlet, so that primary indoor air purification is completed;
(2) when indoor and outdoor simultaneous circulation is performed: opening the air inlet, and simultaneously starting the suction fan and the discharge fan; indoor air is sucked into the shell, passes through the internal circulation medium-efficiency filter screen and the heat exchanger in sequence and is exhausted out of the room through the air outlet; the outdoor air sequentially passes through the primary filter screen, the dual-circulation intermediate filter screen, the heat exchanger and the high-efficiency filter screen and enters the room from the fresh air outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011317469.XA CN112393354A (en) | 2020-11-23 | 2020-11-23 | Internal and external circulation fresh air system and operation mode thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011317469.XA CN112393354A (en) | 2020-11-23 | 2020-11-23 | Internal and external circulation fresh air system and operation mode thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112393354A true CN112393354A (en) | 2021-02-23 |
Family
ID=74606930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011317469.XA Pending CN112393354A (en) | 2020-11-23 | 2020-11-23 | Internal and external circulation fresh air system and operation mode thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN112393354A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204478380U (en) * | 2015-02-27 | 2015-07-15 | 肖建明 | The new blower fan of a kind of intelligent console mode |
| CN105333601A (en) * | 2014-06-24 | 2016-02-17 | 海信（山东）空调有限公司 | Total heat exchanger |
| CN205561071U (en) * | 2016-02-01 | 2016-09-07 | 天津中德职业技术学院 | Antifog haze fresh air device of indoor dual cycle |
| CN106288060A (en) * | 2016-08-26 | 2017-01-04 | 北京中晶泰合新能源科技股份有限公司 | A kind of fresh air purification device |
| CN206055866U (en) * | 2016-07-12 | 2017-03-29 | 淄博气宇空调节能设备有限公司 | Internal-circulation type furred ceiling fresh air ventilator |
| CN108518787A (en) * | 2018-03-22 | 2018-09-11 | 兰舍通风系统有限公司 | Wall-mounted Total heat exchange removes haze fresh air system |
| KR20190050211A (en) * | 2017-11-02 | 2019-05-10 | 주식회사 옴니벤트 | Multifunctional ventilation unit |
| CN210014514U (en) * | 2019-03-20 | 2020-02-04 | 青岛朗兹环保科技有限公司 | New fan |
-
2020
- 2020-11-23 CN CN202011317469.XA patent/CN112393354A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105333601A (en) * | 2014-06-24 | 2016-02-17 | 海信（山东）空调有限公司 | Total heat exchanger |
| CN204478380U (en) * | 2015-02-27 | 2015-07-15 | 肖建明 | The new blower fan of a kind of intelligent console mode |
| CN205561071U (en) * | 2016-02-01 | 2016-09-07 | 天津中德职业技术学院 | Antifog haze fresh air device of indoor dual cycle |
| CN206055866U (en) * | 2016-07-12 | 2017-03-29 | 淄博气宇空调节能设备有限公司 | Internal-circulation type furred ceiling fresh air ventilator |
| CN106288060A (en) * | 2016-08-26 | 2017-01-04 | 北京中晶泰合新能源科技股份有限公司 | A kind of fresh air purification device |
| KR20190050211A (en) * | 2017-11-02 | 2019-05-10 | 주식회사 옴니벤트 | Multifunctional ventilation unit |
| CN108518787A (en) * | 2018-03-22 | 2018-09-11 | 兰舍通风系统有限公司 | Wall-mounted Total heat exchange removes haze fresh air system |
| CN210014514U (en) * | 2019-03-20 | 2020-02-04 | 青岛朗兹环保科技有限公司 | New fan |
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Application publication date: 20210223 |
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