WO2020062206A1 - Ensemble de montage de buses et système de post-traitement - Google Patents

Ensemble de montage de buses et système de post-traitement Download PDF

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Publication number
WO2020062206A1
WO2020062206A1 PCT/CN2018/108939 CN2018108939W WO2020062206A1 WO 2020062206 A1 WO2020062206 A1 WO 2020062206A1 CN 2018108939 W CN2018108939 W CN 2018108939W WO 2020062206 A1 WO2020062206 A1 WO 2020062206A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle
post
heat insulation
heat
mounting assembly
Prior art date
Application number
PCT/CN2018/108939
Other languages
English (en)
Chinese (zh)
Inventor
刘兴龙
闫娟
王奉双
Original Assignee
潍柴动力股份有限公司
潍柴动力空气净化科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 潍柴动力股份有限公司, 潍柴动力空气净化科技有限公司 filed Critical 潍柴动力股份有限公司
Priority to PCT/CN2018/108939 priority Critical patent/WO2020062206A1/fr
Priority to UAA202100756A priority patent/UA127461C2/uk
Priority to CN201880094806.8A priority patent/CN112752898A/zh
Priority to MX2021001593A priority patent/MX2021001593A/es
Publication of WO2020062206A1 publication Critical patent/WO2020062206A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors

Definitions

  • the invention relates to the technical field of engine exhaust gas treatment, in particular to a nozzle mounting assembly.
  • the invention also relates to a post-processing system including the nozzle mounting assembly.
  • the SCR (Selective Catalytic Reduction Converter) uses NH 3 (ammonia) produced by the hydrolysis of urea to convert NO x (nitrogen oxides) in the exhaust gas to N 2 (nitrogen) under the action of a catalyst. Urea is sprayed into the SCR.
  • NH 3 ammonia
  • NO x nitrogen oxides
  • N 2 nitrogen
  • the installation structure of the existing urea nozzle in the post-processing system is shown in Figure 1.
  • the urea nozzle is fixed to the nozzle holder by bolts, the nozzle holder and the post-processing box are welded together, and the spray holes of the urea nozzle are provided through the nozzle holder.
  • the openings inject the urea into the post-processing cabinet. Due to the poor heat insulation of the shell of the post-processing box around the nozzle seat, the heat of the exhaust gas flow in the post-processing box is transmitted to the nozzle through the heat radiation at the housing, causing the nozzle to deform after being exposed to high temperatures. Damaged and does not work properly.
  • an object of the present invention is to provide a nozzle mounting assembly to prevent the nozzle from being deformed and damaged by high temperature during use.
  • Another object of the present invention is to provide a post-processing system including the nozzle mounting assembly, so as to prevent the nozzle from being deformed and damaged by high temperature during use.
  • the present invention provides the following technical solutions:
  • a nozzle mounting assembly includes a nozzle holder, and the nozzle holder is provided with a nozzle through hole for sealing the end of a nozzle hole passing through a urea nozzle, and further comprises a heat insulation for a shell embedded and connected to a post-processing box.
  • the heat shield is composed of at least two layers of heat shields, and there is a heat insulation gap between the two adjacent heat shields; the nozzle seat is sealed and installed on the heat shield; and The nozzle through hole communicates with the inside of the post-processing box.
  • the nozzle holder is disposed in the heat insulation gap, and the nozzle holder is fixed on the heat insulation plate.
  • the nozzle seat is provided with a fixing hole, and the mounting hole of the urea nozzle and the fixing hole are fixedly connected by a fixing member.
  • the nozzle holder is fixed on a layer of the heat insulation plate near the inside of the post-processing box, and the heat insulation plate is provided at a position corresponding to the fixing member.
  • a recess is recessed toward the inside of the post-processing box, and a gap exists between the recess and the fixing member.
  • the nozzle seat is sealed and inserted and fixed on the heat insulation cover, and a layer of heat insulation plate of the heat insulation cover remote from the post-processing box is further provided with a fixing device.
  • a hole seat, the fixing hole seat is provided with a fixing hole, and the mounting hole of the urea nozzle and the fixing hole are fixedly connected by a fixing member.
  • the fixing hole is a threaded hole
  • the fixing member is a threaded connection member
  • the number of the fixing holes is 1 to 6.
  • the number of the heat shield plates of the heat shield is two, which are an upper heat shield plate and a lower heat shield plate, respectively.
  • a heat insulating material is further filled between each adjacent two layers of the heat insulating plates.
  • the heat insulation material is a heat insulation cotton, a heat insulation vacuum plate, or a heat reflective material.
  • the thermal insulation cotton is made of glass fiber material, asbestos, rock wool or silicate.
  • a surface of the fixing member is coated with an anti-sintering agent.
  • the heat shield is a recessed heat shield recessed in a housing of the post-processing box, and the urea nozzle is partially or entirely accommodated in the recess heat insulation.
  • the recess of the hood is a recessed heat shield recessed in a housing of the post-processing box, and the urea nozzle is partially or entirely accommodated in the recess heat insulation.
  • the invention also provides a post-processing system, which comprises a post-processing box and a urea nozzle, and the urea nozzle is arranged on the housing of the post-processing box through the nozzle mounting assembly according to any one of the above.
  • the nozzle installation assembly includes a heat shield and a nozzle holder.
  • the heat shield is composed of at least two layers of heat insulation plates. There is a heat insulation gap between two adjacent heat insulation plates, and the heat insulation cover is embedded in the post-processing box.
  • the nozzle holder is sealed and installed on the heat shield, and the nozzle through hole of the nozzle holder is communicated with the inside of the post-processing box.
  • the nozzle hole end of the urea nozzle is sealed through the nozzle through hole for post-processing Urea is sprayed into the cabinet. Because the nozzle holder is not directly welded and fixed on the single-layer shell of the post-processing box, it is installed on the heat shield.
  • the heat shield has at least two layers of heat shields, and there is a gap between the heat shields.
  • the heat of the exhaust air flow in the processing box is blocked by the heat shield, which reduces the heat radiation to the nozzle, thereby avoiding the nozzle from being deformed and damaged during high temperature during use.
  • the post-processing system provided by the present invention adopts the nozzle mounting assembly of the present invention.
  • the urea nozzle is arranged on the housing of the post-processing box through the nozzle mounting assembly, thereby improving the heat insulation performance around the nozzle, and thus avoiding the use of the nozzle. Deformation and damage due to high temperature during the process.
  • FIG. 1 is a schematic diagram of a mounting structure of a urea nozzle in the prior art
  • FIG. 2 is a schematic structural diagram of a nozzle installation component according to an embodiment of the present invention.
  • FIG. 3 is an exploded schematic view of the nozzle installation assembly in FIG. 2;
  • FIG. 4 is a schematic structural diagram of another nozzle installation component according to an embodiment of the present invention.
  • FIG. 5 is an exploded schematic view of the nozzle mounting assembly in FIG. 4.
  • 01 is a post-processing box
  • 02 is a nozzle holder
  • 03 is a urea nozzle
  • 04 is a bolt
  • 1 is a post-processing box
  • 2 is a heat shield
  • 21 is an upper heat shield
  • 22 is a heat insulator
  • 23 is a lower heat shield
  • 3 is a urea nozzle
  • 4 is a nozzle holder
  • 41 is a nozzle through hole
  • 42 Are fixing holes
  • 5 are fixing pieces
  • 6 are fixing hole seats.
  • the core of the invention is to provide a nozzle mounting assembly, which avoids the nozzle from being deformed and damaged due to high temperature during use.
  • the invention also provides a post-processing system including the nozzle installation assembly, which avoids the nozzle from being deformed and damaged during high temperature during use.
  • An embodiment of the present invention provides a nozzle mounting assembly, which includes a nozzle holder 4 and a heat shield 2, wherein the nozzle holder 4 is provided with a nozzle for sealing the end of a spray hole passing through the urea nozzle 3.
  • the heat shield 2 is used to be embedded and connected to the housing of the post-processing box 1.
  • the heat shield 2 is composed of at least two heat insulation plates, and there is heat insulation between each adjacent two heat insulation plates.
  • the number of gaps and heat insulation plates may specifically be two, three, four or more layers. When there are two layers, the heat insulation plates are the upper heat insulation plate 23 and the lower heat insulation plate 21, for the convenience of description.
  • the following description uses two layers of heat insulation plates as an example.
  • the nozzle holder 4 is hermetically installed on the heat insulation cover 2 and the heat insulation cover 2 Opening holes are provided for the installation of the urea nozzle 3 and for communicating with the interior of the housing of the post-processing box 1, and the nozzle through holes 41 of the nozzle holder 4 communicate with the interior of the post-processing box 1.
  • the nozzle holder 4 Since the nozzle holder 4 is not directly welded and fixed on the single-layer shell of the post-processing box 1, it is installed on the heat shield 2 and is fixed on the shell of the post-processing box 1 through the heat shield 2.
  • the heat shield 2 has at least two layers of heat shields, and there is a gap between the heat shields. Therefore, the heat of the exhaust gas flow in the post-processing box 1 is blocked by the heat shield 2 to reduce the heat radiation to the urea nozzle 3 Therefore, the urea nozzle 3 is prevented from being deformed and damaged due to high temperature during use.
  • this embodiment provides a specific installation structure of the nozzle holder 4.
  • the nozzle holder 4 is disposed in a heat insulation gap, and the nozzle holder 4 is fixed on a heat insulation plate. Since the nozzle holder 4 is disposed in the heat insulation gap between the two heat insulation plates, an opening on a layer of heat insulation plate near the inside of the post-processing box 1 can expose only the nozzle through hole 41 of the nozzle holder 4 Therefore, the area of the nozzle holder 4 directly contacting the exhaust airflow is further reduced, thereby directly reducing heat transfer to the nozzle holder 4, and further reducing heat transfer to the urea nozzle 3 through the nozzle holder 4.
  • the nozzle holder 4 is provided with a fixing hole 42.
  • the mounting hole of the urea nozzle 3 and the fixing hole 42 are fixedly connected by a fixing member 5, so that the urea nozzle 3 is fixed on the nozzle holder 4 to the urea.
  • the nozzle 3 is fixed.
  • the fixing hole 42 is a light hole or a threaded hole
  • the fixing member 5 is a threaded connection member, such as a bolt, a stud, or a screw.
  • the fixing member 5 is a bolt or a screw.
  • the fixing hole 42 is a light hole
  • the fixing member 5 is a stud, and is fixed with a nut by an end thread.
  • the fixing hole 42 and the fixing member 5 may also be a structure with a tight interference fit.
  • the number of the fixing members 5 and the fixing holes 42 is equal, and may be 1 to 6, and when there are multiple fixing holes 42, the fixing holes 42 are evenly distributed along the circumference of the nozzle holder 4 to improve the fixing stability.
  • FIG. 2 and FIG. 3 when the nozzle holder 4 is fixed on a layer of heat insulation plate near the inside of the post-processing box 1, the lower heat insulation plate 21 is shown in FIG. 2.
  • a position of the fixing member 5 is provided with a recess 211 recessed inside the post-processing box 1. There is a gap between the recess 211 and the fixing member 5, and the fixing member 5 does not contact the lower heat insulation plate 21. Since the nozzle holder 4 is fixed to the lower heat insulation plate 21 and is close to the heat source, the heat is directly transmitted to the fixing member 5 through the lower heat insulation plate 21, and then transferred to the urea nozzle 3 through the fixing member 5. Therefore, the lower heat insulation plate 21 and A gap is set between the corresponding fixing members 5 so as to prevent the lower heat insulation plate 21 from contacting the fixing members 5 and further reduce heat transmission.
  • the nozzle holder 4 when the nozzle holder 4 is located in a heat insulation gap and is fixed on a layer of heat insulation plate far from the interior of the post-processing box 1, the upper heat insulation plate 23 is shown in FIG. 2, and the nozzle holder 4 does not directly contact the heat source. Therefore, therefore, the fixing member 5 does not come into contact with the lower heat insulation plate 21, thereby further improving the heat insulation effect. As long as the seal between the nozzle holder 4 and the lower heat insulation plate 21 is ensured.
  • this embodiment provides another mounting structure of the nozzle holder 4.
  • the nozzle holder 4 is sealed and inserted on the heat shield 2, that is, the nozzle holder 4 is a stepped seat, and the nozzle holder 4 is up and down.
  • the upper and lower heat shields 23 and 21 are respectively penetrated at both ends, and the periphery of the nozzle holder 4 is sealedly connected with the heat shield 2.
  • the heat shield 2 is away from the post-processing box 1 layer of heat insulation board. That is, the upper heat-shielding plate 23 is further provided with a fixing hole seat 6.
  • the fixing hole seat 6 is provided with a fixing hole 42.
  • the mounting hole of the urea nozzle 3 and the fixing hole 42 are fixedly connected by a fixing member 5, thereby fixing the urea nozzle 3 to The urea nozzle 3 is fixed to the heat shield 2.
  • the nozzle holder 4 in this embodiment is separately provided from the fixing hole holder 6 with the fixing hole 42, and therefore, the nozzle holder 4 and the row can be further reduced.
  • the area directly contacted by the airflow further reduces heat transfer.
  • the fixing hole seat 6 is fixed on the upper heat insulation plate 23 to keep the fixing member 5 away from the heat source, thereby further reducing the heat transmission.
  • the fixing hole 42 on the fixing hole seat 6 is a light hole or a threaded hole
  • the fixing member 5 is a threaded connection, such as a bolt, a stud, or a screw.
  • the fixing hole 42 is a threaded hole
  • the fixing member 5 is a bolt or a screw.
  • the fixing hole 42 is a light hole
  • the fixing member 5 is a stud, and is fixed with a nut by an end thread.
  • the fixing hole 42 and the fixing member 5 may also be a structure with a tight interference fit.
  • the number of the fixing members 5 and the fixing holes 42 is equal to one to six.
  • the fixing hole holders 6 are evenly distributed along the circumference of the nozzle holder 4, thereby improving the fixing stability.
  • a thermal insulation material 22 is also filled between each adjacent two layers of thermal insulation plates, for example, the upper thermal insulation plate 23 A thermal insulation material 22 is filled between the lower thermal insulation plate 21 and the thermal insulation effect of the thermal insulation material 22 is better than that of a simple thermal insulation gap, thereby further improving the thermal insulation effect. Except for the necessary openings for the fixing member 5 to pass through and the openings for the assembly of the urea nozzle 3 in the heat insulation material 22, the remaining heat insulation gaps are filled with the heat insulation material 22 to maximize the heat insulation. effect.
  • the heat-insulating material 22 is heat-insulating cotton.
  • the heat-insulating material 22 may also be a heat-insulating vacuum plate and a heat-reflecting material.
  • Insulation cotton is preferably made of glass fiber material, which has good thermal insulation effect.
  • the insulation cotton can also be asbestos, rock wool, silicate, etc., as long as it can provide heat insulation.
  • the surface of the fixing member 5 is coated with anti-sintering agent and Apply anti-sintering agent during installation.
  • the heat shield 2 is a recessed heat shield recessed in the housing of the post-processing box 1, that is, the heat shield 2 is recessed as a whole in the post-processing box 1.
  • the outer surface of the housing allows the urea nozzle 3 to be partially or fully accommodated in the recess of the recessed heat shield.
  • the main valve body and the nozzle seat 4 of the urea nozzle 3 are sunk to the outside of the post-processing box 1 Inside the surface, the height of the urea nozzle 3 protruding from the post-processing box 1 is smaller than the height of other attachments (such as brackets, wiring harnesses, etc.) on the box; the urea nozzle 3 does not restrict the installation of the post-processing system, thereby making the structure of the post-processing system more It is compact, reduces space occupation and facilitates space layout. The number of matching models can be effectively increased.
  • an embodiment of the present invention further provides a post-processing system, which includes a post-processing box 1 and a urea nozzle 3, and the urea nozzle 3 passes through as described in any of the above embodiments.
  • the nozzle mounting assembly is disposed on the housing of the post-processing box 1. The heat insulation performance around the urea nozzle 3 is improved, so that the urea nozzle 3 is prevented from being deformed and damaged due to high temperature during use.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Silencers (AREA)

Abstract

L'invention concerne un ensemble de montage de buse qui comprend un siège de buse (4), un trou traversant de buse pour pénétrer à travers une extrémité de trou de pulvérisation d'une buse d'urée (3) de manière étanche est disposé sur le siège de buse (4). L'ensemble de montage de buse comprend en outre un couvercle d'isolation thermique (2) destiné à être relié à une coque d'une boîte de post-traitement (1) de manière intégrée vers l'intérieur. Le couvercle d'isolation thermique (2) est formé à partir d'au moins deux couches de plaques d'isolation thermique, un espace d'isolation thermique existe entre deux couches adjacentes de plaques d'isolation thermique, le siège de buse (4) est monté sur le couvercle d'isolation thermique (2) de manière étanche, et le trou traversant de buse est en communication avec l'intérieur de la boîte de post-traitement (1). L'invention concerne également un système de post-traitement. Selon l'ensemble de montage de buse et le système de post-traitement, la chaleur du flux de gaz d'échappement dans la boîte de post-traitement est bloquée par le couvercle d'isolation thermique, et le transfert de chaleur vers la buse au moyen d'un rayonnement thermique est réduit, ce qui empêche la buse d'être déformée et endommagée en raison de hautes températures pendant l'utilisation.
PCT/CN2018/108939 2018-09-30 2018-09-30 Ensemble de montage de buses et système de post-traitement WO2020062206A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PCT/CN2018/108939 WO2020062206A1 (fr) 2018-09-30 2018-09-30 Ensemble de montage de buses et système de post-traitement
UAA202100756A UA127461C2 (uk) 2018-09-30 2018-09-30 Вузол установки форсунки і система післяобробки
CN201880094806.8A CN112752898A (zh) 2018-09-30 2018-09-30 喷嘴安装组件及后处理系统
MX2021001593A MX2021001593A (es) 2018-09-30 2018-09-30 Conjunto de montaje de boquilla y sistema de postratamiento.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2018/108939 WO2020062206A1 (fr) 2018-09-30 2018-09-30 Ensemble de montage de buses et système de post-traitement

Publications (1)

Publication Number Publication Date
WO2020062206A1 true WO2020062206A1 (fr) 2020-04-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2018/108939 WO2020062206A1 (fr) 2018-09-30 2018-09-30 Ensemble de montage de buses et système de post-traitement

Country Status (4)

Country Link
CN (1) CN112752898A (fr)
MX (1) MX2021001593A (fr)
UA (1) UA127461C2 (fr)
WO (1) WO2020062206A1 (fr)

Citations (6)

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CN101988412A (zh) * 2010-11-12 2011-03-23 无锡市凯龙汽车设备制造有限公司 柴油机scr喷射头
CN201874647U (zh) * 2010-11-12 2011-06-22 无锡市凯龙汽车设备制造有限公司 柴油机scr喷射头
CN203347897U (zh) * 2013-06-18 2013-12-18 潍柴动力股份有限公司 一种scr尿素喷嘴
CN104066942A (zh) * 2013-01-17 2014-09-24 株式会社小松制作所 还原剂水溶液混合装置及具备它的废气后处理装置
US20150176463A1 (en) * 2010-02-10 2015-06-25 Tenneco Automotive Operating Company, Inc. Pressure swirl flow injector with reduced flow variability and return flow
CN205400862U (zh) * 2016-02-22 2016-07-27 天纳克（苏州）排放系统有限公司 喷嘴组件

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US7874164B2 (en) * 2006-11-03 2011-01-25 Pratt & Whitney Canada Corp. Fuel nozzle flange with reduced heat transfer
JP4886636B2 (ja) * 2007-09-04 2012-02-29 日野自動車株式会社 インジェクタの取付構造
US8932530B2 (en) * 2011-12-27 2015-01-13 Komatsu Ltd. Reducing agent aqueous solution mixing device and exhaust gas post-treatment device
DE102012010878A1 (de) * 2012-06-01 2013-12-05 Daimler Ag Reduktionsmittelzugabe- und Aufbereitungssystem eines Kraftfahrzeugs
JP6345628B2 (ja) * 2015-05-26 2018-06-20 コベルコ建機株式会社 還元剤インジェクタ用ガスケット及びそれを備えた排気ガス後処理装置
JP6517111B2 (ja) * 2015-08-24 2019-05-22 株式会社Ｓｏｋｅｎ 断熱部材

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150176463A1 (en) * 2010-02-10 2015-06-25 Tenneco Automotive Operating Company, Inc. Pressure swirl flow injector with reduced flow variability and return flow
CN101988412A (zh) * 2010-11-12 2011-03-23 无锡市凯龙汽车设备制造有限公司 柴油机scr喷射头
CN201874647U (zh) * 2010-11-12 2011-06-22 无锡市凯龙汽车设备制造有限公司 柴油机scr喷射头
CN104066942A (zh) * 2013-01-17 2014-09-24 株式会社小松制作所 还原剂水溶液混合装置及具备它的废气后处理装置
CN203347897U (zh) * 2013-06-18 2013-12-18 潍柴动力股份有限公司 一种scr尿素喷嘴
CN205400862U (zh) * 2016-02-22 2016-07-27 天纳克（苏州）排放系统有限公司 喷嘴组件

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Publication number Publication date
MX2021001593A (es) 2021-05-12
UA127461C2 (uk) 2023-08-30
CN112752898A (zh) 2021-05-04

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