WO2019084636A1 - Dispositivo de redução de pressão interna e máquina elétrica à prova de explosão - Google Patents
Dispositivo de redução de pressão interna e máquina elétrica à prova de explosão Download PDFInfo
- Publication number
- WO2019084636A1 WO2019084636A1 PCT/BR2017/050331 BR2017050331W WO2019084636A1 WO 2019084636 A1 WO2019084636 A1 WO 2019084636A1 BR 2017050331 W BR2017050331 W BR 2017050331W WO 2019084636 A1 WO2019084636 A1 WO 2019084636A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- internal pressure
- housing
- base
- pressure reducing
- reducing device
- Prior art date
Links
- 238000009434 installation Methods 0.000 claims abstract description 6
- 239000000945 filler Substances 0.000 claims description 52
- 239000000463 material Substances 0.000 claims description 6
- 239000007769 metal material Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims 1
- 238000004880 explosion Methods 0.000 description 10
- 239000007789 gas Substances 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- 239000002360 explosive Substances 0.000 description 5
- 230000002787 reinforcement Effects 0.000 description 5
- 229920001296 polysiloxane Polymers 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- -1 vapor Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/136—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas explosion-proof
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/14—Casings; Enclosures; Supports
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
Definitions
- the present invention relates to an explosion-proof electric machine and, more specifically, to an electric machine comprising an internal pressure reduction device.
- Rotating electric machines are widely known in the art and comprise basically a static part (stator) and a rotating part (rotor).
- stator is formed by a slotted magnetic core where windings or coils are accommodated
- rotor comprises a slotted magnetic core which can be filled with windings or coils or further filled by liquid phase metal and subsequently solidified. Since this assembly is mounted on an axis, giving rise to the rotor.
- rotating electric machines are subject to heating of the components and may occasionally generate sparks.
- Electric motors that can operate in environments with the presence of explosive gases are subject to ignition of this explosive atmosphere.
- the engine is built with the ability to withstand possible explosions occurring inside the engine, without propagation to the external environment.
- the combustion process causes an expansion of the gases and when it occurs inside the casing of the machine it tends to increase the internal pressure, increasing the stresses on the components that form the casing of the engine.
- Explosive atmospheres are those that present, in addition to oxygen, a proportion of gas, vapor, dust or fibers, where a spark from an electrical circuit or the heating of equipment may ignite or cause an explosion. This type of atmosphere is found, for example, in the petrochemical, food, pharmaceutical, paper and textile industries.
- One known way of mitigating the risks associated with electrical machines is to confine the parts which can cause the ignition of an explosive atmosphere into a casing capable of withstanding the pressure generated by the internal explosion by allowing the gas resulting from the explosion to exit outwards of the enclosure through interstices with controlled clearance (flame passages), in order to reduce the energy of the gas avoiding the ignition of the external environment to the engine.
- the thickness of the shell is increased so as to make it able to withstand the mechanical stresses resulting from that explosion process. It occurs that the increase in the thickness of the casing causes an increase of mass and volume in the rotating electric machine, and consequently, operating restrictions and cost increase.
- connecting boxes are connected to the housing for housing the electrical cable connections for the machine.
- the junction boxes are positioned as required in the design and secured to the machine housing by means of screws.
- US 1799071 shows a dynamo-electric machine wherein the connecting box is disposed in a conical bush through which conductors pass, and an incombustible substance is provided to surround the conductors and seal the passage between the housing and the junction box.
- German document DE 102009013049 shows an electric motor having a connecting box mounted in a fixing means with a cylindrical opening with an axis perpendicular to that of the motor, an elastic body being inserted justly in the cylindrical opening.
- the elastic body is compressed by an externally threaded member, which engages a threaded portion of the cylindrical cover.
- This construction forms two separate areas for the junction box and enclosure, but allows passage of the junction box cables to the enclosure.
- US 2014/0265682 shows an explosion-proof motor which includes an adapter plate wherein a sealing compound is injected which, upon curing, forms an explosion proof seal.
- the present invention achieves the above objects by means of an internal pressure reduction device for installation in an explosion-proof electric machine of the type comprising a housing and a housing attached to the housing.
- the device comprises a base for installation in a region of the housing below the junction box, the base being configured to receive a plurality of volume fill pieces; wherein the base comprises a bottom part and a wall part which extends through at least a part of the periphery of the bottom part.
- the base may further comprise at least one engaging means for each part of the plurality of volume filler pieces.
- each volume filler piece has at least one engaging means configured to engage with the corresponding engaging means of the base.
- the base may be made of polymeric material, such as silicone or plastic, or of metallic material, such as for example aluminum or cast iron.
- each filler piece is identical, and each filler piece may be made of polymeric material, such as silicone or plastic, or of metallic material, such as aluminum or cast iron.
- the bottom part engaging means preferably comprises at least one oblong projection and the engaging means of each filling piece preferably comprises at least one oblong aperture receiving in the engaging configuration the oblong projection.
- Each filling part may further have a recess with a stop shoulder on the housing of the machine.
- the bottom wall of the base may further comprise an external engaging shoulder cooperating with a recess in the housing of the electric machine, and at least one passageway for passage of electrical connecting cables and wires
- the present invention also relates to an explosion-proof electric machine of the type comprising a casing and a casing attached to the casing such that a region of the casing is defined below the connection box.
- the housing region below the junction box is configured to receive the pressure reducing device of the present invention.
- Figure 1 is a cross-sectional view of a rotating electric machine according to a preferred embodiment of the present invention
- Figure 2 is a perspective view of an upper portion of an electric machine according to a preferred embodiment of the present invention, wherein the connecting box is shown in cross-sectional configuration;
- Figure 3 is a detailed cross-sectional view of the below portion of the electrical machine junction box according to a preferred embodiment of the present invention.
- Figure 4 is a top perspective view of the base of the internal pressure reduction device according to a preferred embodiment of the present invention.
- Figure 5 is a perspective view of the bottom of the base of the internal pressure reduction device according to a preferred embodiment of the present invention.
- Figure 6 is a perspective view of the filling elements of the internal pressure reduction device according to a preferred embodiment of the present invention.
- Figure 7 is a bottom perspective view of one of the internal pressure reduction fillers in accordance with a preferred embodiment of the present invention.
- Figure 8a is a top view of the internal pressure reduction device according to a preferred embodiment of the present invention, the volume filling device being filled with fillers in a first configuration;
- Figure 8b is a perspective view of the reduction device of internal pressure according to a preferred embodiment of the present invention, the volume filler being with filler parts in a first configuration;
- Figure 9a is a top view of the internal pressure reduction device according to a preferred embodiment of the present invention, the volume filling device being filled with fillers in a second configuration;
- Figure 9b is a perspective view of the internal pressure reduction device according to a preferred embodiment of the present invention, the volume filling device being filled with fillers in a second configuration;
- Figure 10a is a top view of the internal pressure reduction device according to a preferred embodiment of the present invention, the volume filling device being filled with fillers in a third configuration;
- Figure 10b is a perspective view of the internal pressure reduction device according to a preferred embodiment of the present invention, the volume filling device being filled with fillers in a third configuration;
- Figure 11a is a top view of the internal pressure reduction device according to a preferred embodiment of the present invention, the volume filler being with filler parts in a fourth configuration;
- Figure 11b is a perspective view of the internal pressure reduction device according to a preferred embodiment of the present invention, the volume filler being with filler pieces in a fourth configuration.
- Figure 12a is a top view of the internal pressure reduction device according to a preferred embodiment of the present invention, the volume filler being without fillers in a fifth configuration;
- Figure 12b is a perspective view of the reduction device of internal pressure according to a preferred embodiment of the present invention, the volume filler being without fillers in a fifth configuration.
- Figure 1 shows a cross-sectional view of an electric machine according to a preferred embodiment of the present invention.
- the machine comprises a housing 1 in which a connecting box 2 is attached.
- a connecting box 2 As known to those skilled in the art, the connection box
- 2 generally comprises a box with a lid whose body is configured to allow the passage and connection of electric cables.
- one of the objects of the present invention is to reduce the pressure in the area below the junction box by filling the void volume in that region.
- the internal pressure reduction device of the present invention comprises a base 10 configured to receive a plurality of volume filler pieces 20.
- the base 10 and the volume filler pieces 20 are preferably produced from polymeric material.
- the polymeric material is silicone.
- other polymeric or metallic materials could be used.
- the device may comprise a different number of bulk fill pieces 20.
- the device can only be installed with the base 10 as a filling of volume. That is, in one configuration of the device of the present invention, the base 10 is used without the volume filler pieces. This configuration of the device is shown in Figures 12a and 12b.
- the base 10 comprises having a bottom portion 11 and a wall portion 12.
- the wall portion 12 extends through the periphery of the bottom portion 11 of the base 10, except for an access part where the wall part is not present.
- the bottom part 11 comprises at least one engaging means 13 for each volume filler piece 20, each volume filler piece 20 having a corresponding engaging means 21.
- the engaging means 13 of the bottom part 11 comprises at least one oblong projection 13 and the engaging means 21 of the filling part comprises at least one oblong opening 21 that receives, in a set-up configuration, the aperture
- the oblong apertures 21 of the volume filler pieces 20 may be better seen in Figure 7.
- the aperture and projection could have any other shape, provided they allowed a fit between them.
- the engaging means 13 of the bottom part 11 could comprise an aperture
- the engaging means 21 of the volume filling piece 20 could comprise a projection aperture, without this altering the operating principle of the engaging between The pieces.
- each volume filler piece 20 may further have a recess 22 that cooperates with a bumper shoulder on the housing. Such an abutment helps to maintain the filler pieces that are close to the opening of the wall 12 of the base 10 in the correct position relative to the base and the casing (see, for example, Figures 9b and 10b).
- the bottom wall 11 may further comprise an outer engagement shoulder 14 that cooperates with a recess in the housing of the electric machine and at least one lane of passage 15 for passing cables and wires of electrical connection.
- the bottom wall 11 has two through tracks 15.
- Each passageway 15 is preferably in the form of a wall that slopes downwardly from the surface of the bottom wall 11 so as to create a passageway space for the cables and wires.
- the passageways 15 extend towards the access portion of the base 10 (i.e. towards the base portion 10 without the wall portion 12. As shown in Figures 4, 5 and 8b).
- Each volume filler piece 20 preferably comprises a polymer-produced part having a geometry configured to fit the base 10.
- the polymeric material is silicone.
- other polymeric or metallic materials could be used.
- the fillers of the device are all of the same format, decreasing the assembly's manufacturing costs and facilitating the replacement of the parts if necessary.
- each filler comprises a substantially parallel top wall 23 and a bottom wall 24, two flat side walls 25 at an approximately right angle to each other, and a curved side wall 26 that is bonded to the two flat walls.
- the base 10 has a geometry configured to receive the volume filler pieces 20.
- the wall portion 12 is shaped with curved surfaces for accommodating the curved walls 26 of the volume filler pieces 20.
- Figures 8a and 8b show the pressure reduction device installed in an electric machine where the connecting box is installed so that the cable outlet is to the right of the device (see arrow). As best seen in Figure 8b, in that configuration the pressure reduction device has three volume filler pieces 20 engaged in the base 10, so that one of the through runs 15 is unfilled.
- Figures 9a and 9b show the internal pressure reduction device installed in an electric machine where the connecting box is installed so that the cable outlet is to the left of the device (see arrow). As best shown in Figure 9b, in that configuration the pressure reduction device has two volume filler pieces 20 engaged in the base 10, the left side of the device being without filler parts.
- Figures 10a and 10b show the internal pressure reduction device installed in an electric machine where the connecting box is installed so that the cable outlet is in front of the device (see indicative arrow). As best shown in Figure 10b, in that configuration the pressure reduction device has three volume filler pieces 20 engaged in the base 10, so that one of the passageways 15 is unfilled.
- Figures 11a and 11b show the internal pressure reduction device installed in an electric machine where the connecting box is installed so that the cable outlet is at the back of the device (see arrow indicative ). As best shown in Figure 11b, in this configuration the pressure reduction device has two volume filler pieces 20 engaged in the base 10, the right side of the device being without filler parts.
- Figures 12a and 12b show the internal pressure reduction device installed in an electric machine where the connecting box is installed so that the passage of the cables requires a greater need of space. As best shown in Figure 12b, in this configuration the The pressure reduction device uses only the base 10 as a volume filler.
- volume filler pieces 20 may vary according to the amount and gauge of cables present in the engine. Larger quantity of cables use smaller quantities of fillers 20.
- the amount of volume filler pieces may be greater than four, it being sufficient that the shape of the parts is changed according to the fitting provided in the base.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Motor Or Generator Frames (AREA)
- Casings For Electric Apparatus (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR112020008708-4A BR112020008708B1 (pt) | 2017-11-03 | 2017-11-03 | Dispositivo de redução de pressão interna e máquina elétrica à prova de explosão |
PCT/BR2017/050331 WO2019084636A1 (pt) | 2017-11-03 | 2017-11-03 | Dispositivo de redução de pressão interna e máquina elétrica à prova de explosão |
BR112020008735-1A BR112020008735A2 (pt) | 2017-11-03 | 2017-11-03 | dispositivo de redução de pressão interna e máquina elétrica à prova de explosão |
US16/761,442 US11303182B2 (en) | 2017-11-03 | 2017-11-03 | Internal pressure reduction device and explosion-proof electric machine |
DE112017008051.7T DE112017008051T5 (de) | 2017-11-03 | 2017-11-03 | Innendruckreduktionsvorrichtung und explosionssichere elektrische Maschine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/BR2017/050331 WO2019084636A1 (pt) | 2017-11-03 | 2017-11-03 | Dispositivo de redução de pressão interna e máquina elétrica à prova de explosão |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2019084636A1 true WO2019084636A1 (pt) | 2019-05-09 |
Family
ID=66331157
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/BR2017/050331 WO2019084636A1 (pt) | 2017-11-03 | 2017-11-03 | Dispositivo de redução de pressão interna e máquina elétrica à prova de explosão |
Country Status (4)
Country | Link |
---|---|
US (1) | US11303182B2 (pt) |
BR (2) | BR112020008708B1 (pt) |
DE (1) | DE112017008051T5 (pt) |
WO (1) | WO2019084636A1 (pt) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11862388B2 (en) * | 2022-01-14 | 2024-01-02 | Counterfog Corporation | Intrinsically safe electromagnetic devices |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5144177A (en) * | 1988-10-12 | 1992-09-01 | Ksb Aktiengesellschaft | Canned motor pump with heat exchanger in rotor chamber |
US20060250037A1 (en) * | 2003-05-30 | 2006-11-09 | Siemens Aktiengessellschaft | Electrical machine having a stator that is enclosed in an explosion-proof manner |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1799071A (en) | 1928-04-27 | 1931-03-31 | Allis Louis Co | Dynamo-electric machine |
US4223364A (en) * | 1978-05-25 | 1980-09-16 | Sangster Harold L | Pressure and temperature responsive protective devices |
DE102011010799A1 (de) * | 2011-02-09 | 2012-08-09 | Krohne Messtechnik Gmbh | Explosionsgeschütztes Gerät |
US9634536B2 (en) | 2013-03-15 | 2017-04-25 | General Electric Company | Systems and methods for isolating a conduit enclosure using an adapter plate for an explosion proof motor |
-
2017
- 2017-11-03 BR BR112020008708-4A patent/BR112020008708B1/pt active IP Right Grant
- 2017-11-03 WO PCT/BR2017/050331 patent/WO2019084636A1/pt active Application Filing
- 2017-11-03 DE DE112017008051.7T patent/DE112017008051T5/de active Pending
- 2017-11-03 BR BR112020008735-1A patent/BR112020008735A2/pt not_active Application Discontinuation
- 2017-11-03 US US16/761,442 patent/US11303182B2/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5144177A (en) * | 1988-10-12 | 1992-09-01 | Ksb Aktiengesellschaft | Canned motor pump with heat exchanger in rotor chamber |
US20060250037A1 (en) * | 2003-05-30 | 2006-11-09 | Siemens Aktiengessellschaft | Electrical machine having a stator that is enclosed in an explosion-proof manner |
Also Published As
Publication number | Publication date |
---|---|
DE112017008051T5 (de) | 2020-06-18 |
BR112020008708A2 (pt) | 2021-02-09 |
BR112020008735A2 (pt) | 2020-10-20 |
US11303182B2 (en) | 2022-04-12 |
US20200395810A1 (en) | 2020-12-17 |
BR112020008708B1 (pt) | 2023-03-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6278206B2 (ja) | 電動機及びその製造方法 | |
US3927249A (en) | Explosion proof plastic electrical enclosure | |
US10680491B2 (en) | Motor with integrated junction box | |
US20110019355A1 (en) | Fire Resistant Enclosure for a Data Storage Device Having Heat Sink Capabilities and Method for Making the Same | |
WO2019084636A1 (pt) | Dispositivo de redução de pressão interna e máquina elétrica à prova de explosão | |
RU2570801C2 (ru) | Электродвигатель постоянного тока во взрывозащищенном конструктивном исполнении | |
CN102290941A (zh) | 高压隔爆型三相异步电动机 | |
CN206481147U (zh) | 一种塑封电机 | |
WO2021088392A1 (zh) | 一种防爆阻燃型压敏电阻及其自动化生产方法 | |
WO2019218541A1 (zh) | 一种防着火阻燃塑封电机 | |
EP2790301B1 (en) | Systems and methods for isolating a conduit enclosure using an adapter plate for an explosion proof motor | |
CN208656566U (zh) | 防爆塑封电机 | |
JP5967133B2 (ja) | 内燃機関用回転電機およびそのセンサユニットの製造方法 | |
WO2018097175A1 (ja) | 水中モータ及び防水コネクタ | |
CA2844220C (en) | Systems and methods for isolating a conduit enclosure for an explosion proof motor | |
CN202190169U (zh) | 高压隔爆型三相异步电动机 | |
US3250930A (en) | Lead seal for dynamoelectric machine | |
CN101189781A (zh) | 发动机 | |
CN220890584U (zh) | 无蜗壳的无脑电子水泵部件及无脑电子水泵、热管理模块 | |
CN217385543U (zh) | 防爆式转速测量仪 | |
CN210898835U (zh) | 电机霍尔器件护盖 | |
KR200285437Y1 (ko) | 방폭접지접속구 | |
GB2108470A (en) | Liquid fuel dispensing pump with an electrical or electronic counter | |
KR101758636B1 (ko) | 가스절연개폐장치 운송용 보호 커버 | |
US1616149A (en) | Controller housing |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 17930905 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 112020008735 Country of ref document: BR |
|
REG | Reference to national code |
Ref country code: BR Ref legal event code: B01A Ref document number: 112020008735 Country of ref document: BR |
|
ENP | Entry into the national phase |
Ref document number: 112020008735 Country of ref document: BR Kind code of ref document: A2 Effective date: 20200430 |
|
REG | Reference to national code |
Ref country code: BR Ref legal event code: B01A Ref document number: 112020008708 Country of ref document: BR |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 17930905 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 112020008708 Country of ref document: BR Kind code of ref document: A2 Effective date: 20200430 |