EP3516229A1 - Schraubenkompressorsystem für ein nutzfahrzeug - Google Patents
Schraubenkompressorsystem für ein nutzfahrzeugInfo
- Publication number
- EP3516229A1 EP3516229A1 EP17778212.5A EP17778212A EP3516229A1 EP 3516229 A1 EP3516229 A1 EP 3516229A1 EP 17778212 A EP17778212 A EP 17778212A EP 3516229 A1 EP3516229 A1 EP 3516229A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- screw compressor
- control
- screw
- air
- oil
- 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
Links
- 230000001105 regulatory effect Effects 0.000 claims abstract description 12
- 230000001276 controlling effect Effects 0.000 claims abstract 2
- 230000000694 effects Effects 0.000 description 5
- 238000000746 purification Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/06—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for stopping, starting, idling or no-load operation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/28—Safety arrangements; Monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2210/00—Fluid
- F04C2210/10—Fluid working
- F04C2210/1005—Air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2210/00—Fluid
- F04C2210/22—Fluid gaseous, i.e. compressible
- F04C2210/221—Air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/80—Diagnostics
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/026—Lubricant separation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2210/00—Working fluid
- F05B2210/10—Kind or type
- F05B2210/12—Kind or type gaseous, i.e. compressible
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2210/00—Working fluid
- F05B2210/16—Air or water being indistinctly used as working fluid, i.e. the machine can work equally with air or water without any modification
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/10—Purpose of the control system
Definitions
- the present invention relates to a screw compressor system for a commercial vehicle with at least one screw compressor and with at least one control and / or regulating unit for drive control and / or regulation of the vehicle
- Screw compressor for commercial vehicles are already known from the prior art. Such screw compressors are used to provide the necessary compressed air for, for example, the braking system of the commercial vehicle.
- Screw chamber formed. To pressurize the screw chamber with increased pressure, it is because at the outlet of the screw chamber with stationary screws still the working pressure is applied, while at the inlet of
- Screw chamber essentially the atmospheric pressure is applied so that the air against the conveying direction flows back to the suction side and builds pressure there.
- Screw compressor system for a commercial vehicle with at least one
- Screw compressor and with at least one control and / or
- Control unit for drive control and / or regulation of the
- Screw compressor is provided, wherein the control and / or Verification unit is such that the screw compressor after a stop on a
- Restart is prevented for a predetermined period of time.
- the invention is based on the idea that the screw compressor has a relief valve, via which the pressure in the screw compressor can be reduced after a stop of the screw compressor.
- Screw compressor for a predetermined period of time ensures that the pressure in the screw compressor can be degraded in any case. If this is not the case, the so-called charging effect can occur, i. that the compressed air under working pressure flows upstream into the screw chamber through its outlet and rests against the air inlet and at the beginning of the screw of the screw compressor, so that this pressure is further built up by restarting the
- Screw compressor In this case, a very high drive torque, the would be noticeable as an excessive starting current in an electric screw compressor drive and would lead to an overload of the electric motor. This undesired operating state should be reliably prevented. It can be prevented that in any case a predetermined period of time has been waited, within which the pressure in the screw compressor is reduced.
- control and / or regulating unit is part of the screw compressor.
- a compact structure is formed and it is not necessary to have access to external components.
- control and / or regulating unit is part of a Luftaufberettungssytems the commercial vehicle.
- control and / or Vergei unit is part of an engine or vehicle control of the commercial vehicle. Again, it would be possible to access an already existing component of the commercial vehicle.
- control and / or control unit is designed as a separate control and / or regulating unit. This allows beispei Iriya a simple installation and also easy replacement or
- the time span is at least approximately 10 seconds, in particular at least approximately 15 seconds. Such a period is sufficient in the conventional relief valves to achieve a safe drop in the working pressure or prevailing pressure in the screw compressor to a pressure level at which there is no harmful high chairströmtik in the screw chamber. Furthermore, it can be provided that the screw compressor has at least one relief valve. About this relief valve, the pressure in the
- Screw compressor can be dismantled easily and reliably.
- the relief valve is dimensioned such that the interior of the
- Screw compressor within the predetermined period of time to a pressure near atmospheric pressure or atmospheric pressure can be depressurized. This allows safe operation of the screw compressor and safely avoided the so-called. Charging effect.
- Fig. 1 is a schematic sectional view through an inventive
- FIG. 2 is a schematic drawing of the screw compressor system according to the present invention.
- Fig. 1 shows a schematic sectional view of a screw compressor 10 in the sense of an embodiment of the present invention.
- the screw compressor 10 has a mounting flange 12 for the mechanical attachment of the screw compressor 10 to a drive not shown here in detail in the form of an electric motor. Shown, however, is the input shaft 14, via which the torque from the electric motor to one of the two screws 16 and 18, namely the screw 16 is transmitted.
- the screw 18 meshes with the screw 16 and is driven by this.
- the screw compressor 10 has a housing 20 in which the essential components of the screw compressor 10 are housed.
- the housing 20 is filled with oil 22. Air inlet side, an inlet port 24 is provided on the housing 20 of the screw compressor 10. The inlet nozzle 24 is designed such that an air filter 26 is arranged on it. In addition, a Heilein passage 28 is provided radially on the air inlet pipe 24.
- a spring-loaded valve core 30 is provided, designed here as an axial seal.
- This valve insert 30 serves as a check valve.
- an air supply channel 32 Downstream of the valve core 30, an air supply channel 32 is provided, which supplies the air to the two screws 16, 18.
- an air outlet pipe 34 is provided with a riser 36.
- a temperature sensor 38 is provided, by means of which the oil temperature can be monitored.
- Weather is provided in the air outlet, a holder 40 for an air de-oiling 42nd
- the holder 40 for the air de-oiling element has in the assembled state in the area facing the bottom (as shown in Fig. 1), the air de-oiling element 42.
- the holder for the air de-oiling element 40 has a
- the check valve 48 and the minimum pressure valve 50 may also be formed in a common, combined valve.
- the air outlet 51 is connected to correspondingly known compressed air consumers in the rule.
- a riser 52 is provided which has the outlet of the holder 40 for the air de-oiling element 42 when passing into the housing 20 a filter and check valve 54.
- a nozzle 56 Downstream of the filter and check valve 54, a nozzle 56 is provided in a housing bore.
- the oil return line 58 leads back approximately in the middle region of the screw 16 or the screw 18 to supply it again oil 22.
- an oil drain plug 59 is provided within the assembled state of the bottom portion of the housing 20, an oil drain plug 59 is provided. About the oil drain plug 59, a corresponding oil drain opening can be opened, via which the oil 22 can be drained.
- Ansile of the thermostatic valve 66 may be a control and / or
- Control means may be provided, by means of which the oil temperature of the oil 22 located in the housing 20 can be monitored and adjusted to a desired value.
- Oer cooler 74 is connected to the neck 60.
- a safety valve 76 In the upper region of the housing 20 (relative to the mounted state) there is a safety valve 76, via which an excessive pressure in the housing 20 can be reduced. Before the minimum pressure valve 50 is a bypass line 78, which leads to a relief valve 80. About this relief valve 80, by means of a
- connection with the air supply 32 is driven, air can be returned to the region of the air inlet 28.
- a vent valve not shown in detail and also a nozzle (diameter of the feeding line supply) may be provided.
- an oil level sensor 82 may be provided.
- This oil level sensor 82 may be, for example, an optical sensor and arranged and set up so that it can be detected by the sensor signal, whether the oil level is above the Ollevelsensors 82 in operation or if the oil level sensor 82 is exposed and thereby the oil level has fallen accordingly.
- an alarm unit can also be provided which outputs or forwards an appropriate error message or warning message to the user of the system.
- the function of the screw compressor 10 shown in Fig. 1 is as follows: Air is supplied via the air inlet 28 and passes through the check valve 30 to the screws 16, 18, where the air is compressed. The compressed air-oil mixture, with a factor between 5 to 16 times compression after the Screws 16 and 18 rises through the outlet line 34 via the riser 36 is blown directly onto the temperature sensor 38.
- the air which still partly carries oil particles, is then guided via the holder 40 into the air de-oiling element 42 and, provided the corresponding minimum pressure is reached, enters the air outlet line 51.
- the oil 22 located in the housing 20 is maintained at the operating temperature via the oil filter 62 and possibly via the heat exchanger 74.
- the heat exchanger 74 is not used and is not switched on.
- Screw 16 but also fed to the bearing 72.
- the screw 16 or the screw 18 is supplied via the return line 52, 58 with oil 22, here is the purification of the oil 22 in Luftentölelement 42.
- the electric motor not shown in detail, which transmits its torque via the shaft 14 to the screw 16, which in turn meshes with the screw 18, the screws 16 and 18 of the screw compressor 10 are driven.
- Fig. 2 shows a schematic view of the invention
- Screw compressor system 100 with the screw compressor 10 shown in Fig. 1 and a control unit 1 10.
- the control unit 1 10 is here as a control unit of the
- Screw compressor 10 or formed as part of the screw compressor 10.
- control and regulation unit 110 is part of an air handling system (EAC) of the commercial vehicle, part of a motor control of the commercial vehicle, part of a vehicle control of the commercial vehicle or as a separate control and regulation unit 1 10 executed.
- EAC air handling system
- control unit 1 10 By means of the control unit 1 10 is ensured that after a stop of the screw compressor 10 and the drive of the screw compressor 10, a restart of the screws 16, 18 is prevented for a predetermined period of time.
- This time span is about 10 seconds in the embodiment shown, but may also be in the range between 10 to 15 seconds or even higher.
- the working pressure prevailing in the screw compressor 10 can be reduced within the predetermined period of time to such an extent that in any case the so-called charging effect is reliably avoided.
- This charging effect occurs in particular in that the working pressure applied behind or downstream of the screws 16, 18 directly after the stop of the screw compressor 10 flows upstream both via the outlet of the screw chamber and via the corresponding lines 58, 68 into the suction region of the screws 16, 18, that can get into the air inlet 32. If it then comes to a restart of the screws 16, 18, even before a pressure reduction has taken place, the pressure applied there is compressed by the screws 16, 18, so that it can come to an undesirable operating state in which the working pressure again, for example could be condensed tenfold.
- the relief valve 80 is dimensioned such that the interior of the working pressure applied behind or downstream of the screws 16, 18 directly after the stop of the screw compressor 10 flows upstream both via the outlet of the screw chamber and via the corresponding lines 58, 68 into the suction region of the screws 16, 18, that can get into the air inlet 32. If it
- Screw compressor 10 can be relieved of pressure within the predetermined period of time to a pressure near atmospheric pressure or about atmospheric pressure.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016011437.1A DE102016011437A1 (de) | 2016-09-21 | 2016-09-21 | Schraubenkompressorsystem für ein Nutzfahrzeug |
PCT/EP2017/073539 WO2018054857A1 (de) | 2016-09-21 | 2017-09-19 | Schraubenkompressorsystem für ein nutzfahrzeug |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3516229A1 true EP3516229A1 (de) | 2019-07-31 |
EP3516229B1 EP3516229B1 (de) | 2022-08-31 |
Family
ID=60009593
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17778212.5A Active EP3516229B1 (de) | 2016-09-21 | 2017-09-19 | Schraubenkompressorsystem für ein nutzfahrzeug |
Country Status (8)
Country | Link |
---|---|
US (1) | US11085447B2 (de) |
EP (1) | EP3516229B1 (de) |
JP (1) | JP6926211B2 (de) |
KR (1) | KR20190045356A (de) |
CN (1) | CN109790839B (de) |
BR (1) | BR112019005048A2 (de) |
DE (1) | DE102016011437A1 (de) |
WO (1) | WO2018054857A1 (de) |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH660100A5 (fr) * | 1981-12-18 | 1987-03-13 | Cerac Inst Sa | Dispositif d'entrainement d'un compresseur. |
FI83808C (fi) * | 1988-10-05 | 1991-08-26 | Tampella Oy Ab | Foerfarande foer styrning av luftproduktionen i en skruvkompressor. |
AT401551B (de) | 1994-03-30 | 1996-10-25 | Hoerbiger Ventilwerke Ag | Vorrichtung zur druckabsenkung eines verdichters |
JP3250912B2 (ja) | 1994-09-27 | 2002-01-28 | 株式会社日立製作所 | パッケージ形スクリュー圧縮機 |
US7290990B2 (en) * | 1998-06-05 | 2007-11-06 | Carrier Corporation | Short reverse rotation of compressor at startup |
BE1015717A3 (nl) * | 2003-10-15 | 2005-07-05 | Atlas Copco Airpower Nv | Verbeterde watergeinjecteerde schroefcompressor. |
DE102004060417B4 (de) | 2004-12-14 | 2006-10-26 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Kompakter Schraubenkompressor zum mobilen Einsatz in einem Fahrzeug |
DE102005010690B4 (de) | 2005-03-09 | 2007-04-12 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Öleingespritzter Verdichter mit Temperaturschalter |
JP5203754B2 (ja) | 2008-03-11 | 2013-06-05 | 株式会社日立産機システム | インバータ圧縮機の制御方法及びインバータ圧縮機 |
JP2010031814A (ja) | 2008-07-31 | 2010-02-12 | Hitachi Ltd | 油冷式スクリュー圧縮機とモータ駆動システム及びモータ制御装置 |
US9145893B2 (en) | 2011-06-08 | 2015-09-29 | Bendix Commercial Vehicle Systems Llc | Current control via speed control for driving screw compressor under cold conditions |
EP2708429B1 (de) * | 2012-09-12 | 2015-08-26 | KNORR-BREMSE Systeme für Nutzfahrzeuge GmbH | Druckluftsystem für ein Motorfahrzeug |
BE1021737B1 (nl) | 2013-09-11 | 2016-01-14 | Atlas Copco Airpower, Naamloze Vennootschap | Vloeistofgeinjecteerde schroefcompressor, sturing voor de overgang van een onbelaste naar een belaste situatie van zulke schroefcompressor en werkwijze daarbij toegepast |
US10316842B2 (en) | 2014-03-20 | 2019-06-11 | Hitachi Industrial Equipment Systems Co., Ltd. | Air compressor |
-
2016
- 2016-09-21 DE DE102016011437.1A patent/DE102016011437A1/de not_active Ceased
-
2017
- 2017-09-19 US US16/331,267 patent/US11085447B2/en active Active
- 2017-09-19 WO PCT/EP2017/073539 patent/WO2018054857A1/de unknown
- 2017-09-19 EP EP17778212.5A patent/EP3516229B1/de active Active
- 2017-09-19 JP JP2019536666A patent/JP6926211B2/ja active Active
- 2017-09-19 CN CN201780058085.0A patent/CN109790839B/zh active Active
- 2017-09-19 BR BR112019005048A patent/BR112019005048A2/pt active Search and Examination
- 2017-09-19 KR KR1020197010549A patent/KR20190045356A/ko not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
US20200040897A1 (en) | 2020-02-06 |
CN109790839B (zh) | 2021-05-25 |
BR112019005048A2 (pt) | 2019-06-18 |
US11085447B2 (en) | 2021-08-10 |
WO2018054857A1 (de) | 2018-03-29 |
JP2019529795A (ja) | 2019-10-17 |
DE102016011437A1 (de) | 2018-03-22 |
EP3516229B1 (de) | 2022-08-31 |
JP6926211B2 (ja) | 2021-08-25 |
KR20190045356A (ko) | 2019-05-02 |
CN109790839A (zh) | 2019-05-21 |
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