CN110770511A - Split muffler assembly with sound absorbing end sides - Google Patents
Split muffler assembly with sound absorbing end sides Download PDFInfo
- Publication number
- CN110770511A CN110770511A CN201780089611.XA CN201780089611A CN110770511A CN 110770511 A CN110770511 A CN 110770511A CN 201780089611 A CN201780089611 A CN 201780089611A CN 110770511 A CN110770511 A CN 110770511A
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- CN
- China
- Prior art keywords
- muffler
- absorber
- microperforated
- housing
- sound
- 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.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/20—Casings or covers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/007—Ventilation with forced flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
- F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
- F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
- F24F7/065—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit fan combined with single duct; mounting arrangements of a fan in a duct
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/20—Casings or covers
- F24F2013/205—Mounting a ventilator fan therein
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
- F24F2013/242—Sound-absorbing material
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Exhaust Silencers (AREA)
Abstract
The present invention relates to a muffler assembly comprising: -a housing (1) with an arbitrary wall structure, said housing containing a sound source (11); a pipe system (3, 4) for conveying a medium; and a dividing muffler installed in the pipe system (3, 4), said dividing muffler having a series of parallel dividing muffler shells (6), wherein gas gaps (10) are provided between the dividing muffler shells (6), through which gas gaps the medium can flow. The silencer assembly is characterized in that a sound absorber, in particular a microperforated absorber (7), is arranged on the end side of the partial silencer housing (6) facing the sound source (11), or a microperforated absorber (7.6) is inserted between adjacent partial silencer housing sections (5.1, 5.2) in the flow direction.
Description
Technical Field
The present invention relates to a muffler assembly according to the preamble of claim 1.
Background
Many technical devices are installed for operation in a surrounding housing or a line system. These housings or pipe systems can be used for multiple purposes, for example to protect equipment from external influences, to protect personnel and the surroundings from equipment hazards, to transport media (if the housing is also part of a transport line), or to limit the emission of sound of equipment into the surroundings.
A branching muffler assembly is known from US 5,473,124 a, in which the side wall of the muffler is perforated.
DE 3707650C 1 discloses a branching silencer, in which a flow path is provided in the inflow path
Using phase-rotated resonators.
DE 29710491U 1 discloses a branching muffler which utilizes the sound damping effect by microperforations.
A branching muffler with a curved inflow curve is known from WO 2009/110843 a 1.
A branching muffler with a circular inflow curve is known from US 2,916,101 a. The inflow curve can be made acoustically transparent and surround a space filled with sound-damping material.
Disclosure of Invention
The object of the invention is to effectively reduce the noise in the housing or pipe system in the selected acoustic frequency rangeThe source radiates to sound in the surrounding environment. It is assumed that the noise source placed in the housing is connected to the surroundings by a pipe system and that the pipe system is used for conveying the medium. The radiation of the acoustic energy to the surroundings is then transmitted directly through the housing wall as sound on the one hand and propagates to the outside along the pipe system as sound on the other hand. The radiated sound energy depends on the sound power of the sound source, the sound absorption characteristics of the inner surface of the housing, the sound damping properties of the housing wall, the bulk sound transmission of the pipe systemAnd the sound absorption effect of the pipeline system.
The measures for reducing the sound radiation to the surroundings are therefore determined by the following points:
-reducing the noise source level;
-reducing the noise level inside the housing by increasing the absorption of the space inside the housing, or by taking absorption measures in the housing volume;
-improving the sound damping effect of the housing wall;
-acoustically decoupling the pipe system from the housing of the sound source;
-installing a muffler in the pipeline path in order to reduce the noise level along the pipeline.
The prior art includes the following structures:
the housing wall is made of a non-metallic, solid, porous or layered material;
the housing wall is formed by a single-or multi-shell metal structure;
-the walls of the multishell with or without acoustically effective filled gas gaps;
-providing a reverberation bare (schallharten blanket) metal surface to the inner wall of the housing;
-providing the inner wall of the housing with an absorbent material of different thickness;
-providing sound absorbing material inside the housing;
-providing a bulk acoustic decoupling element between the housing and the pipe element for reducing acoustic longitudinal conduction in the pipe system
-providing a silencer element as a pipe silencer or a shunt silencer in the pipe system, so that the fluid can flow as undisturbed as possible;
-providing a porous absorber with or without fibrous material;
-providing a plate resonator; and
-providing the micro-perforated absorber as a freely positioned planar element, or providing the micro-perforated absorber as a tunable downstream gas gap with or without damping.
The object of the present invention is to provide a muffler assembly according to the preamble of claim 1 which advantageously combines the sound absorbing effect inside the housing with the action of the split muffler.
This object is achieved by a muffler assembly according to claim 1.
According to other embodiments of the invention set forth in the dependent claims, the walls of the microperforations can be advantageously arranged in different ways.
According to the present invention, a muffler assembly is provided with: a housing having an arbitrary wall structure, the housing containing a sound source; a pipe system for conveying a medium; and a split muffler mounted in the pipe system, the split muffler having a series of parallel split muffler shells, wherein between the split muffler shells a gas gap is provided through which the medium can flow.
The silencer assembly is characterized in that a sound absorber, in particular a micro-perforated absorber, is arranged on the end side of the partial silencer housing facing the sound source, or in that a sound absorber, in particular a micro-perforated absorber, is inserted between adjacent partial silencer housing sections in the flow direction.
This reduces the sound level in the area of the housing where the sound source is located. This aspect is generally not considered important, since only the attenuation of the sound accompanying the flow in the flowing medium is to be noted. Such a sound accompanying the flow in the medium can of course also be attenuated by the muffler on the end side, i.e. on the upstream side, but only to a lesser extent. The sound level in the region of the housing in which the sound source is located is mainly attenuated here. Thus, the radiation of sound from the region into the surroundings is reduced in a simple manner. This is particularly surprising, mainly because of the improved sound insulation and/or sound damping effect in the housing wall.
The present invention operates with essentially any sound absorber. From the present point of view, however, the invention operates in particular with the aid of a microperforated absorber. In this regard, emphasis has always been placed on microperforated absorbers.
It should also be clear that the effect of the invention, i.e. the sound in the housing cannot be reduced very well, is not achieved well by means of split mufflers with absorbers on the end sides. It is important that the additional absorber on the end side is in the immediate vicinity of the region of the housing in which the muffler is located. This is not the case, however, in US patent 2,916,101a, which was found when searching within the knowledge of the present invention. The sound attenuation performed on the upstream side of US 2,916,101a is only for improving the sound attenuation effect of the flowing medium.
In one embodiment, the absorber is microperforated and has a width and depth selected to absorb sound in a desired spectral range. It is clear here that complete sound absorption is not possible and that the frequency range cannot be set arbitrarily precisely. However, the absorber can be designed independently of the sound source and the desired attenuation.
In one embodiment, the absorber has microperforated walls oriented toward the acoustic source. In this way, a typical micro-perforated absorber is formed that reduces the sound content within the cavity of the housing (i.e., the area of the housing where the sound source is located).
In one embodiment, the absorber has microperforated walls oriented in the direction of the gas gap. Thus, the sound content in the flowing medium can be attenuated.
In an embodiment, the absorber has two or more microperforated walls oriented in two or more directions. This enables attenuation in different directions.
In an embodiment, the absorber has a curved microperforated wall oriented towards the sound source. The curved wall has the advantage, in particular, of forming a circular, flow-dynamically advantageous inflow curve. In addition, the curvature causes a broadband effect of the tuned resonator, since by the curvature the absorber volume does not exist with a uniform depth.
In one embodiment, the absorber has a dividing element or a plurality of dividing elements in the direction of its maximum dimension subdivided into partial volumes. This is advantageous in terms of acoustic effect, since the sound absorption effect increases in the desired frequency range. This also provides design advantages.
In an embodiment, the absorber has an additional rear wall. Although in many embodiments the wall facing the sound source is used as the back wall without the absorber, it is also possible to apply an additional back wall as the back wall. This therefore achieves independence from existing walls.
In an embodiment, the absorber interposed between adjacent split muffler shell portions has two or more microperforated walls oriented toward the gas gap. Therefore, the effect of the split muffler can be enhanced.
The invention also relates to a divided muffler for use in the above muffler assembly, wherein a hollow body with microperforations can be placed or attached on the upstream side of the divided muffler.
Drawings
The invention will now be further explained with reference to exemplary embodiments. In the drawings:
fig. 1 shows a muffler assembly comprising a housing, a line path for a flowing medium, and a shunt muffler mounted on the housing in the line path, on which a microperforated absorber is fitted;
FIG. 2 shows an exploded view of a portion of a muffler assembly with a portion of a split muffler, a microperforated absorber shell, and an absorber back wall;
FIG. 3 shows a different form of muffler assembly according to the present invention;
FIG. 3a shows a split muffler section with an attached absorber
A perforated surface of the absorber oriented towards the sound source;
FIG. 3b shows a side view of a split muffler section with an attached absorber, with a perforated surface of the absorber along the gap of the mufflerIs oriented in the direction of (a);
FIG. 3c shows a side view of a split muffler section with an attached absorber, with both perforated surfaces of the absorber doubly oriented in the direction of the muffler gap;
FIG. 3d shows a side view of a split muffler section with an attached absorber, with three perforated surfaces of the absorber oriented in three different directions;
FIG. 3e shows a side view of the split muffler section with the absorber attached, the perforated surface of the absorber being curved; and
fig. 3f shows a side view of a divided muffler part divided into two parts, between which the absorber is inserted, the two perforated faces of the absorber being oriented in the direction of the gap of the muffler.
Detailed Description
Fig. 1 shows the overall system of a muffler assembly, which comprises a box-like housing 1 having: a closed space 2; a wall opening 3 arranged on the right side of the housing, which wall opening 3 can be adjoined by a portion of the pipe path; and a wall opening 4 for the pipe path provided on the left side of the housing. The muffler assembly also comprises a split muffler 5 arranged on the inner wall of the left-hand shell in the form of an absorber, resonator or hybrid structure, and a microperforated absorber 7 placed (aufgesetzte) on the shell 6 of the split muffler 5. The absorbers 7 each have a perforated front wall 9 and can have a rear wall 8. An air gap 10 is provided between the branch mufflers 5. A noise source 11 with or without a transmission function is provided in the middle of the housing 1.
In general, the muffler assembly is a muffler assembly having a housing 1 with an arbitrary wall structure and containing a sound source 11. The muffler assembly is connected to a pipe system 3, 4 for conveying the medium to the surroundings. The muffler assembly has a pipe or split muffler mounted in the vicinity of the housing 1 in the pipe system 3, 4 and having a series of concentrically or parallel arranged pipe or split muffler housings 6 with gas gaps 10 between the pipe or split muffler housings 6. A microperforated absorber 7 is placed on the end side of the pipe or divided muffler shell 6 facing the sound source 11, or a microperforated absorber 7.6 is inserted between the pipe or divided muffler shell parts 5.1, 5.2.
The sound radiation of the noise source 11 in the pipe path is reduced in a defined acoustic frequency range by the perforated front wall 9 of the absorber 7. This absorption frequency can be tuned in particular to the interference frequency in the source spectrum, so that a targeted sound reduction can be achieved in the housing 1. The effect of the grade reduction is not constant; the effect of the grade reduction is highest in the vicinity of the absorber. The positioning of the absorber 7 on the end side of the branch muffler 5 has the advantage that the highest absorption effect can be achieved directly at the inlet of the branch muffler 5. The effect of the grade reduction is thus optimized along the pipe path extending over the wall opening 4.
FIG. 2 shows a muffler system
Is composed of a part of a divided muffler 5 with a housing 6 and an absorber 7 with a housing with a microperforated front wall 9. The absorber housing can be provided with an absorber rear wall 8. The receptor housing can also be subdivided with one or more separating elements 12. The absorber 7 is placed and fixed on the housing 6.
Fig. 3 shows a different embodiment of an absorber applied to a split muffler 5. The absorber has microperforated walls of different orientations (pointing in different directions), or has different basic shapes.
Fig. 3a shows a possible embodiment in which the microperforated wall 9.1 of the absorber 7.1 is directed in the direction of the sound source 11.
Fig. 3b shows a possible embodiment in which the microperforated wall 9.2 of the absorber 7.2 points in the direction of the gas gap 10.
Fig. 3c shows a possible embodiment in which the two microperforated walls 9.2, 9.3 of the absorber 7.3 point in the direction of the gas gap 10.
Fig. 3d shows a possible embodiment in which the three microperforated walls 9.2, 9.3, 9.4 of the absorber 7.4 point in three different directions.
Fig. 3e shows a possible embodiment in which the microperforated wall 9.5 of the absorber 7.5 is curved.
Fig. 3f shows a possible embodiment in which the dividing muffler is divided into two parts 5.1, 5.2, between which the absorber 7.5 is inserted, wherein the microperforated walls 9.2, 9.3 of the absorber 7.5 point in the direction of the gas gap 10.
Claims (10)
1. A muffler assembly, comprising: a housing with an arbitrary wall structure, said housing containing a sound source (11); a pipe system (3, 4) for conveying a medium; and a dividing muffler mounted in the pipe system (3, 4) and having a series of parallel dividing muffler shells (6), wherein gas gaps (10) are provided between the dividing muffler shells (6), through which gas gaps the medium can flow,
it is characterized in that the preparation method is characterized in that,
on the end side of the partial muffler shell (6) facing the sound source (11), a sound absorber, in particular a microperforated absorber (7), is arranged, or a microperforated absorber (7.6) is inserted between adjacent partial muffler shell sections (5.1, 5.2) in the flow direction.
2. The muffler assembly of claim 1,
the micro-perforations and the width and depth of the absorber (7) are selected such that sound absorption is performed in a desired spectral range.
3. The muffler assembly of any one of claims 1 or 2,
the absorber (7, 7.1) has a microperforated wall (9, 9.1) oriented towards the sound source (11).
4. The muffler assembly of any one of the preceding claims,
the absorber (7.2) has a microperforated wall (9.2) oriented in the direction of the gas gap (10).
5. The muffler assembly of any one of the preceding claims,
the absorber (7.3, 7.4) has two or more microperforated walls (9.2, 9.3, 9.4) oriented in two or more directions.
6. The muffler assembly of any one of the preceding claims,
the absorber (7.5) has a curved microperforated wall (9.5) oriented towards the sound source (11).
7. The muffler assembly of any one of the preceding claims,
the absorber (7) is subdivided into partial volumes in the direction of its maximum dimension by a separating element (12) or a plurality of separating elements.
8. The muffler assembly of any one of the preceding claims,
the absorber (7) has an additional rear wall (8).
9. The muffler assembly of any one of the preceding claims,
the absorber (7.6) inserted between adjacent partial-flow muffler shell sections (5.1, 5.2) has one or two microperforated walls (9.2, 9.3) oriented in the direction of the gas gap (10).
10. A split muffler for a muffler assembly according to any one of claims 1 to 9,
a hollow body with microperforations can be placed or attached on the upstream side of the dividing muffler (6).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2017/059054 WO2018188762A1 (en) | 2017-04-14 | 2017-04-14 | Splitter sound attenuator assembly comprising sound-absorbing end faces |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110770511A true CN110770511A (en) | 2020-02-07 |
Family
ID=58579157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780089611.XA Pending CN110770511A (en) | 2017-04-14 | 2017-04-14 | Split muffler assembly with sound absorbing end sides |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3610205A1 (en) |
| CN (1) | CN110770511A (en) |
| WO (1) | WO2018188762A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113638909B (en) * | 2021-07-22 | 2023-03-21 | 联想(北京)有限公司 | Sound absorbing device, heat radiating device and case for server |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2347513A1 (en) * | 1973-09-21 | 1975-04-10 | Korfmann Gmbh Maschf | Ventilation unit absorption sound damper - has sound-absorbing blocks with tubular elements held by end plates |
| JPS56501533A (en) * | 1979-11-07 | 1981-10-22 | ||
| DE3425450A1 (en) * | 1983-09-22 | 1985-04-04 | Rox Lufttechnische Gerätebau GmbH, 5000 Köln | Equipment silencer |
| CN86204649U (en) * | 1986-09-16 | 1987-09-12 | 上海柴油机厂 | Throttle muffler |
| DK159669B (en) * | 1982-05-14 | 1990-11-12 | Bahco Ventilation Ab | MUFFLER |
| CN2192001Y (en) * | 1994-06-27 | 1995-03-15 | 袁明志 | Compound silencing elbow for minisize hole plate |
| DE29710491U1 (en) * | 1997-02-14 | 1998-03-12 | Westa Holding Gmbh & Co Kg | Silencer |
| CN2444295Y (en) * | 2000-09-20 | 2001-08-22 | 上海博旭复合装饰材料有限公司 | Combined sound absorption board |
| KR100555375B1 (en) * | 2004-04-30 | 2006-03-03 | 이영섭 | Resonance type duct silencer |
| CN200943897Y (en) * | 2006-08-01 | 2007-09-05 | 合肥普贤机电科技有限公司 | Fume purifying device |
| CN202117739U (en) * | 2011-06-30 | 2012-01-18 | 东莞市力宇燃气动力有限公司 | Resistant/retardant combined type exhaust muffler |
| CN205970735U (en) * | 2016-08-30 | 2017-02-22 | 平湖爱驰威汽车零部件有限公司 | Novel special muffler of foldable vehicle air conditioner system of many boards |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2916101A (en) | 1957-02-25 | 1959-12-08 | Israel A Naman | Sound-absorbing structures |
| DE3103231C2 (en) * | 1981-01-30 | 1984-04-12 | Müller - BBM GmbH, 8033 Planegg | silencer |
| DE3707650C1 (en) | 1987-03-10 | 1988-06-09 | Fraunhofer Ges Forschung | Sound absorber for scenery |
| US5473124A (en) | 1994-01-31 | 1995-12-05 | Dipti Datta | Packless silencer |
| SE532157C2 (en) | 2008-03-06 | 2009-11-03 | Lindab Ab | Noise-canceling baffle and baffle arrangement |
-
2017
- 2017-04-14 WO PCT/EP2017/059054 patent/WO2018188762A1/en active Application Filing
- 2017-04-14 CN CN201780089611.XA patent/CN110770511A/en active Pending
- 2017-04-14 EP EP17718509.7A patent/EP3610205A1/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2347513A1 (en) * | 1973-09-21 | 1975-04-10 | Korfmann Gmbh Maschf | Ventilation unit absorption sound damper - has sound-absorbing blocks with tubular elements held by end plates |
| JPS56501533A (en) * | 1979-11-07 | 1981-10-22 | ||
| DK159669B (en) * | 1982-05-14 | 1990-11-12 | Bahco Ventilation Ab | MUFFLER |
| DE3425450A1 (en) * | 1983-09-22 | 1985-04-04 | Rox Lufttechnische Gerätebau GmbH, 5000 Köln | Equipment silencer |
| CN86204649U (en) * | 1986-09-16 | 1987-09-12 | 上海柴油机厂 | Throttle muffler |
| CN2192001Y (en) * | 1994-06-27 | 1995-03-15 | 袁明志 | Compound silencing elbow for minisize hole plate |
| DE29710491U1 (en) * | 1997-02-14 | 1998-03-12 | Westa Holding Gmbh & Co Kg | Silencer |
| CN2444295Y (en) * | 2000-09-20 | 2001-08-22 | 上海博旭复合装饰材料有限公司 | Combined sound absorption board |
| KR100555375B1 (en) * | 2004-04-30 | 2006-03-03 | 이영섭 | Resonance type duct silencer |
| CN200943897Y (en) * | 2006-08-01 | 2007-09-05 | 合肥普贤机电科技有限公司 | Fume purifying device |
| CN202117739U (en) * | 2011-06-30 | 2012-01-18 | 东莞市力宇燃气动力有限公司 | Resistant/retardant combined type exhaust muffler |
| CN205970735U (en) * | 2016-08-30 | 2017-02-22 | 平湖爱驰威汽车零部件有限公司 | Novel special muffler of foldable vehicle air conditioner system of many boards |
Non-Patent Citations (1)
| Title |
|---|
| 陈益武: "《通风空调管道安装》", 31 October 2010, pages: 185 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018188762A1 (en) | 2018-10-18 |
| EP3610205A1 (en) | 2020-02-19 |
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