EP3390185A1 - Cartouche de sécheur d'air - Google Patents

Cartouche de sécheur d'air

Info

Publication number
EP3390185A1
EP3390185A1 EP16815815.2A EP16815815A EP3390185A1 EP 3390185 A1 EP3390185 A1 EP 3390185A1 EP 16815815 A EP16815815 A EP 16815815A EP 3390185 A1 EP3390185 A1 EP 3390185A1
Authority
EP
European Patent Office
Prior art keywords
air dryer
cartridge
dryer cartridge
housing
compressed air
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.)
Withdrawn
Application number
EP16815815.2A
Other languages
German (de)
English (en)
Inventor
Günther Reifinger
Andreas Ochsenkühn
Stefan SCHÄBEL
Andreas Leinung
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Original Assignee
Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
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 Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH filed Critical Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Publication of EP3390185A1 publication Critical patent/EP3390185A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/002—Air treatment devices
    • B60T17/004—Draining and drying devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0407—Constructional details of adsorbing systems
    • B01D53/0415—Beds in cartridges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/261—Drying gases or vapours by adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/002—Air treatment devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/45—Gas separation or purification devices adapted for specific applications
    • B01D2259/455—Gas separation or purification devices adapted for specific applications for transportable use

Definitions

  • the present invention relates to an air dryer cartridge, in particular for a compressed air treatment plant of commercial vehicles.
  • Such air dryer cartridges are used for example in commercial vehicles such as trucks and tractors. These often have one or more compressed air consumers such as brake systems or air suspensions that need to be supplied with compressed air.
  • the compressed air is typically from a
  • Compressor for example a driven by a drive motor of the vehicle reciprocating compressor provided.
  • the compressed air provided by the compressor usually has to be further processed.
  • the compressed air is cleaned of dirt particles that were already contained in the intake air, as well as oil and soot particles that are introduced by the compressor into the compressed air during the compression process, and moisture is deposited in the compressed air.
  • the compressed air treatment systems of commercial vehicles usually have air dryer cartridges that dehumidify the compressed air and can also absorb oil and dirt particles.
  • Conventional air dryer cartridges have a cartridge housing with a
  • a closed housing cover arranged in the cartridge housing inner housing, one in a space between the cartridge housing and the
  • Inner housing received desiccant and disposed within the cartridge housing filter device for cleaning the compressed air.
  • the compressed air first flows through the filter device before it enters the desiccant.
  • a bypass for bypassing the filter device is usually provided and is in this Bypass arranged a check valve.
  • Such an air dryer cartridge is disclosed, for example, in WO 2004/01 1 125 A2.
  • the check valve is attached to a coalescing filter parallel to this.
  • the invention has for its object to provide an improved air dryer cartridge with a simple structure.
  • the air dryer cartridge according to the invention has a cartridge housing with a closed housing cover; an inner housing disposed in the cartridge housing; a dry agent received in a space between the cartridge case and the inner case; a filter device disposed within the cartridge housing positioned upstream of the desiccant in compressed air flow relative to normal operation of the air dryer cartridge; a bypass for bypassing the filter device; and a non-return valve arranged in the bypass, which is formed integrally with the inner housing and blocks a compressed air flow in the direction of the desiccant and allows compressed air flow in the direction of the desiccant.
  • the check valve in one piece with the inner housing.
  • the inner housing and / or the check valve are made of a plastic material.
  • the check valve can preferably be molded onto the inner housing or inner housing and check valve can be produced with a 2-component injection molding.
  • the inner housing and the check valve may preferably be made of the same plastic material or of different plastic materials be made.
  • plastic material should in this context basically include all types of plastics, in particular with respect to the check valve elastomers.
  • the term plastic material in this context should include materials of one material and also materials of two or more different materials.
  • the check valve has a valve flap, which is integrally formed on the inner housing.
  • Check valve may preferably by a shaping and / or material selection of the valve flap and / or a shape of the connection between
  • Valve flap and inner housing can be achieved.
  • the check valve is in a direction substantially parallel to a longitudinal axis of the air dryer cartridge, i. can be traversed by compressed air substantially axially.
  • the check valve may preferably comprise a valve flap having a free end which is supported on an inner peripheral surface of the cartridge housing, preferably on a portion of the inner peripheral surface of the cartridge housing which is substantially parallel to the longitudinal axis of the air dryer cartridge.
  • the check valve in a direction substantially transverse to a longitudinal axis of the air dryer cartridge, that is substantially radially through which compressed air can flow.
  • the check valve can be positioned further inside the cartridge housing and is thus better protected, for example, against external mechanical stress on the cartridge housing.
  • the check valve may preferably have a valve flap with a free end, which is supported on a inner surface facing the inner flange flange surface of the mounting flange.
  • the filter device is arranged substantially coaxially to the longitudinal axis of the air dryer cartridge.
  • the filter device is preferably traversed in the radial direction transversely to the longitudinal axis of the air dryer cartridge of compressed air.
  • the filter device is configured in this case, for example, as a coalescing filter or oil filter.
  • the filter device is aligned substantially transversely to the longitudinal axis of the air dryer cartridge.
  • the filter device is preferably flowed through in the axial direction parallel to the longitudinal axis of the air dryer cartridge of compressed air.
  • the filter device is designed in this case, for example, as a coarse filter.
  • the inner housing preferably has a first inner housing part and a second inner housing part.
  • the first inner housing part is preferably arranged radially outside the second inner housing part and the second inner housing part is movable relative to the first inner housing part in the axial direction parallel to the longitudinal axis of the air dryer cartridge.
  • a biasing element is preferably provided which presses the second inner housing part in the direction of the housing cover of the air dryer cartridge to compress the desiccant.
  • the air dryer cartridge on a mounting flange for closing an open end facing away from the housing cover of the cartridge housing and attaching the air dryer cartridge to a compressed air processing device.
  • the inner housing is preferably sealed by a sealing lip against the mounting flange.
  • This sealing lip is preferably made of a plastic material.
  • plastic material is intended in this context to include in principle all types of plastics, in particular elastomers.
  • plastic material in this context should include materials of one material and also materials of two or more different materials.
  • the sealing lip may be made of the same or of a different plastic material than the check valve.
  • the present invention is particularly suitable for use in compressed air treatment systems of a commercial vehicle advantageous.
  • Fig. 1 is a partial sectional view of an air dryer cartridge according to a first
  • Fig. 2 is a partial sectional view of an air dryer cartridge according to a second
  • Fig. 1 shows the structure of an air dryer cartridge according to a first embodiment, which is mountable on a compressed air treatment device of a compressed air treatment plant.
  • the air dryer cartridge 10 is substantially rotationally symmetrical to a longitudinal axis 12 and has a substantially cylindrical or cup-shaped cartridge housing 14 with a closed housing cover 16, which is designed in the form of a deep-drawn sheet metal.
  • the housing cover 16 facing away from the open end of the cartridge housing 14 is provided with a mounting flange 18th
  • the mounting flange 18 is fixed and fluid-tightly connected to the cartridge housing 14, for example, with the aid of a circumferential support ring 76th
  • the mounting flange 18 has, for example, an annular inlet opening 20 and, for example, a circular, central outlet opening 24.
  • the outlet opening 24 is arranged in the radial direction transversely to the longitudinal axis 12 within the inlet opening 20.
  • inlet and outlet in this context refer to the fluid flow direction through the air dryer cartridge 10 during normal operation to dry and purify the fluid. In the regeneration mode, the air dryer cartridge 10 and thus the inlet and outlet openings 20, 24 are flowed through in the reverse direction.
  • the central Auslasso réelle 24 is bounded by a mounting sleeve 22 of the mounting flange 18.
  • This attachment piece 22 is provided with an internal thread.
  • the air dryer cartridge 10 is mountable on a compressed air treatment device (not shown) which is part of a compressed air treatment plant.
  • the compressed air treatment device has a connecting piece, which is provided with an external thread, so that the air dryer cartridge 10 can be screwed to the attachment piece 22 of the mounting flange 18 on the compressed air preparation device.
  • the screw connection between the attachment piece 22 and the connection piece forms a detachable, but fluid-tight connection between the air dryer cartridge 10 and the compressed air preparation device.
  • the longitudinal axis 12 of the air dryer cartridge 10 and the longitudinal axis of the connecting piece of the compressed air treatment device are aligned coaxially with each other.
  • the air dryer cartridge 10 also has an inner housing 40 which consists of a first inner housing part 40a and a second inner housing part 40b and is preferably formed from a plastic material.
  • the first inner housing part 40a of the inner housing 40 is arranged in the radial direction transversely to the longitudinal axis 12 outside the second inner housing part 40b of the inner housing 40.
  • Cartridge housing 14, mounting flange 18, and inner housing 40 define therebetween a receiving space for a desiccant 60 (eg, silica gel).
  • the first inner housing part 40 a of the inner housing 40 is provided at a substantially radially oriented wall portion with a plurality of openings 42, which are in fluid communication with the inlet opening 20 of the mounting flange 18.
  • the compressed air can flow from the compressed air treatment device through the inlet opening 20 in the mounting flange 18 and the openings 42 of the inner housing 40 into the interior of the cartridge housing 14. in the
  • a filter device 44 eg coarse filter
  • the compressed air can be cleaned before it flows through the desiccant 60 in the cartridge housing 14 of the air dryer cartridge 10.
  • a bypass 48 is provided in the radial direction outside of the filter device 44.
  • a check valve 52 is arranged, which prevents the normal operation of the air dryer cartridge 10 that compressed air flows from the inlet port 20 to the filter device 44 past by the bypass 48 unpurified in the desiccant 60.
  • the check valve 52 allows an air flow past the filter device 44.
  • the inner housing 40 is preferably formed from a plastic material.
  • the check valve 52 is preferably also formed of a plastic material. It can be used for the inner housing 40 and the check valve 52 either the same or different plastic materials.
  • an elastomer can be used, optionally of one or at least two different materials.
  • the check valve 52 is formed integrally with the first inner housing part 40 a of the inner housing 40.
  • the check valve is molded onto the first inner housing part 40a or manufactured therewith in 2K injection molding technique.
  • the check valve 52 is configured in the manner of a valve flap.
  • the valve flap is substantially annular around the longitudinal axis 12 of the air dryer cartridge 10 is formed.
  • One end of the valve flap, in particular the radially inner end of the valve flap is integrally formed on the first inner housing part 40 a of the inner housing 40.
  • the other free end of the valve flap is supported on an inner peripheral surface 53 of the cartridge housing 14, in particular on a portion of the inner peripheral surface 53 which extends substantially parallel to the longitudinal axis 12 of the air dryer cartridge 10.
  • the check valve 52 in the regeneration operation of the air dryer cartridge axially, ie flows through in a direction substantially parallel to the longitudinal axis 12 of the air dryer cartridge 10.
  • a sealing lip 43 is additionally provided on the first inner housing part 40a of the inner housing 40 in the region of the openings 42, which is resiliently biased against the inner peripheral surface 53 of the cartridge housing 14 and is preferably integrally formed with the first inner housing part 40a.
  • a sealing lip 54 is provided on the first inner housing part 40a, which is preferably formed integrally therewith and preferably against the
  • the second inner housing part 40 b of the inner housing 40 has openings 56 in the central area, which connect the interior of the cartridge housing 14 with the outlet opening 24.
  • a sealing lip 58 is provided, which is preferably formed integrally therewith and is preferably elastically biased against the first inner housing part 40a of the inner housing 40.
  • the second inner housing part 40b of the inner housing 40 is movable in the axial direction, ie parallel or coaxial with the longitudinal axis 12 of the air dryer cartridge 10 in the cartridge housing 14.
  • a biasing member 62 in the form of a compression spring which is supported against the first inner housing part 40 a, the second inner housing part 40 b of the inner housing 40 is pressed in the direction of the housing cover 16 to compress the desiccant 60.
  • the sealing lip 58 on the second inner housing Part 40b remains the inner housing 40 between its two inner housing parts 40a, 40b fluid-tight.
  • the second inner housing part 40b is configured in such a way that part of the drying means 60 is arranged in a spatial area in the radial direction within the pretensioning element 62. Due to this optimum use of space inside the cartridge housing 14, the air dryer cartridge 10 can be smaller, d. H. be configured with a smaller diameter and / or a smaller height.
  • a sealing ring 70 in the embodiment of FIG. 1 preferably a square sealing ring is arranged between these two elements.
  • the sealing ring 70 rests on the one hand on a sealing surface 80 of the air dryer cartridge 10 and on the other hand on an opposite sealing surface of the compressed air treatment device. When screwing the air dryer cartridge 10 with the compressed air treatment device, the sealing ring 70 is compressed and creates a fluid-tight seal with respect to the two sealing surfaces.
  • the sealing surface 80 is provided on a side facing away from the housing cover 16 of the cartridge housing 14 end face of the air dryer cartridge 10. It runs in a plane substantially perpendicular to the longitudinal axis 12 of the air dryer cartridge 10 is substantially flat.
  • the sealing surface 80 is formed by the flange outer surface of the mounting flange 18.
  • the support ring 76 is formed such that it has on its inside a contact surface for the sealing ring 70.
  • Fig. 2 shows the structure of an air dryer cartridge according to a second embodiment.
  • the filter device 44 is designed as a coalescing filter or oil filter and is aligned substantially coaxially with the longitudinal axis 12 of the air dryer cartridge 10.
  • the filter device 44 can for example be plugged or wound on the inner housing 40.
  • the filter device 44 is flowed through in a direction transverse to the longitudinal axis 12 of the air dryer cartridge 10, that is radially through compressed air.
  • the bypass 48 and the check valve 52 are disposed substantially below the filter device 44.
  • the check valve 52 is integrally formed with a portion of the first inner housing part 40 a of the inner housing 40, which holds the filter device 44.
  • the non-return valve 52 has a valve flap, which is formed in a substantially annular manner about the longitudinal axis 12 of the air dryer cartridge 10.
  • One end of the valve flap, in particular the radially inner end of the valve flap is integrally formed on the first inner housing part 40 a of the inner housing 40.
  • the other free end of the valve flap is supported on an inner peripheral surface 53 of the cartridge housing 14, in particular on a portion of the inner peripheral surface 53 which extends substantially parallel to the longitudinal axis 12 of the air dryer cartridge 10.
  • the check valve 52 is flowed through axially in the regeneration mode of the air dryer cartridge.
  • the air dryer cartridge 10 of this embodiment corresponds to that of the first embodiment.
  • the present invention is not limited to the above-described embodiments of the compressed air processing system. On the contrary, those skilled in the art will recognize numerous variants and modifications that fall within the scope of the claims. While the inner housing 40 is constructed in the described embodiments each of a first inner housing part 40a and a second inner housing part 40b, the inner housing 40 may be formed integrally in other embodiments or be composed of more than two housing parts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Drying Of Gases (AREA)

Abstract

Cartouche de sécheur d'air (10), notamment pour un système de conditionnement d'air comprimé d'un véhicule utilitaire, présentant un boîtier de cartouche (14) pourvu d'un couvercle (16) fermé, un boîtier interne (40) agencé dans le boîtier de cartouche (14), un agent siccatif (60) logé dans un espace intermédiaire entre le boîtier de cartouche (14) et le boîtier interne (40), un élément filtre (44) agencé dans le boîtier de cartouche (14) et positionné dans le flux d'air comprimé en amont de l'agent siccatif (60) lors d'un fonctionnement normal de la cartouche de sécheur d'air (10), ainsi qu'une dérivation (48) servant à contourner l'élément filtre (44). Dans la dérivation (48) est agencé un clapet antiretour (52) qui empêche un écoulement d'air comprimé en direction de l'agent siccatif et autorise un écoulement d'air comprimé à partir de l'agent siccatif. Ce clapet antiretour (52) forme une seule pièce avec le boîtier interne (40).
EP16815815.2A 2015-12-18 2016-12-15 Cartouche de sécheur d'air Withdrawn EP3390185A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015122168.3A DE102015122168A1 (de) 2015-12-18 2015-12-18 Lufttrocknerpatrone
PCT/EP2016/081216 WO2017102960A1 (fr) 2015-12-18 2016-12-15 Cartouche de sécheur d'air

Publications (1)

Publication Number Publication Date
EP3390185A1 true EP3390185A1 (fr) 2018-10-24

Family

ID=57589024

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16815815.2A Withdrawn EP3390185A1 (fr) 2015-12-18 2016-12-15 Cartouche de sécheur d'air

Country Status (6)

Country Link
US (1) US10723341B2 (fr)
EP (1) EP3390185A1 (fr)
CN (1) CN108698581B (fr)
BR (1) BR112018011872A2 (fr)
DE (1) DE102015122168A1 (fr)
WO (1) WO2017102960A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015122168A1 (de) * 2015-12-18 2017-06-22 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Lufttrocknerpatrone
DE102016120477A1 (de) * 2016-10-27 2018-05-03 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Lufttrocknerpatrone
US11517851B2 (en) * 2019-08-14 2022-12-06 New York Air Brake, LLC Air dryer with prefiltration stage bypass

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US5595588A (en) * 1995-07-24 1997-01-21 Alliedsignal Truck Brake Systems Co. Air dryer cartridge mounting system
SE9703945L (sv) * 1997-10-29 1999-04-30 Haldex Brake Prod Ab Sätt och anordning vid en lufttorkare
US5901459A (en) * 1997-11-26 1999-05-11 Westinghouse Air Brake Company Shuttle mechanism for twin tower air dryer system
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US6094836A (en) * 1999-04-12 2000-08-01 Skf Usa Inc. Dual air dryer with spin-on cartridges
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EP1626796B2 (fr) * 2003-05-19 2020-11-18 WABCO GmbH Cartouche de dessiccateur d'air
US6785980B1 (en) 2003-08-05 2004-09-07 Haldex Brake Corporation Compressed air supply system
US7100305B2 (en) * 2003-09-27 2006-09-05 Bendix Commerical Vehicle Systems Llc Air dryer mounting assembly
US7097696B2 (en) * 2004-02-27 2006-08-29 Skf Usa Inc. Dual cartridge air dryer with oil separator and readily changeable valves
GB0424480D0 (en) * 2004-11-04 2004-12-08 Wabco Automotive Uk Ltd Improved air dryer
DE102004059508C5 (de) * 2004-12-10 2008-07-03 Haldex Brake Products Gmbh Verfahren zum Reinigen von Druckluft an Druckluftbeschaffungsanlagen von Kraftfahrzeugen sowie Kartusche hierfür
DE102005039059B3 (de) * 2005-08-18 2006-09-28 Haldex Brake Products Gmbh Kartusche zum Reinigen von Druckluft in Druckluftbeschaffungsanlagen von Kraftfahrzeugen
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DE102007046167B4 (de) 2007-09-27 2014-02-20 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Luftfilterpatrone für eine Druckluftaufbereitungsanlage
CN102281937B (zh) * 2009-01-14 2015-03-11 纳博特斯克自动株式会社 空气干燥装置中的油抑制结构
DE102009030897B4 (de) * 2009-06-29 2015-02-26 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Lufttrocknerpatrone für eine Druckluftaufbereitungsanlage eines Fahrzeugs und Druckluftaufbereitungsanlage für ein Fahrzeug mit einer entsprechenden Lufttrocknerpatrone.
DE102010010882B4 (de) * 2010-03-10 2021-10-21 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Lufttrocknerpatrone und Verfahren zum Betreiben einer Lufttrocknerpatrone
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JP5749569B2 (ja) * 2011-03-25 2015-07-15 ナブテスコオートモーティブ株式会社 プレッシャガバナ及びエアドライヤ
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DE102015122168A1 (de) * 2015-12-18 2017-06-22 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Lufttrocknerpatrone

Also Published As

Publication number Publication date
DE102015122168A1 (de) 2017-06-22
BR112018011872A2 (pt) 2018-11-27
WO2017102960A1 (fr) 2017-06-22
CN108698581A (zh) 2018-10-23
CN108698581B (zh) 2021-04-20
US10723341B2 (en) 2020-07-28
US20180297572A1 (en) 2018-10-18

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