US20040126247A1 - Muffler for air compressor - Google Patents

Muffler for air compressor Download PDF

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Publication number
US20040126247A1
US20040126247A1 US10/685,716 US68571603A US2004126247A1 US 20040126247 A1 US20040126247 A1 US 20040126247A1 US 68571603 A US68571603 A US 68571603A US 2004126247 A1 US2004126247 A1 US 2004126247A1
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United States
Prior art keywords
air
line
outlet
muffler
filter
Prior art date
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Abandoned
Application number
US10/685,716
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English (en)
Inventor
Dietmar Broser
Fritz Woltmann
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.)
ZF CV Systems Hannover GmbH
Original Assignee
Wabco GmbH
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Filing date
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Application filed by Wabco GmbH filed Critical Wabco GmbH
Assigned to WABCO GMBH & CO. OHG reassignment WABCO GMBH & CO. OHG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BROSER, DIETMAR, WOLTMANN, FRITZ
Publication of US20040126247A1 publication Critical patent/US20040126247A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/005—Pulsation and noise damping means with direct action on the fluid flow using absorptive materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
    • B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
    • B60G17/052—Pneumatic spring characteristics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B41/00—Pumping installations or systems specially adapted for elastic fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/20—Spring action or springs
    • B60G2500/201—Air spring system type
    • B60G2500/2012—Open systems

Definitions

  • the present invention relates generally to a muffler and, in particular, to a muffler for an air-spring system of the type used in passenger vehicles.
  • FIG. 2 shows a conventional muffler, designed for a passenger car, for the intake section ( 1 ) of a combined functional unit comprising air compressor ( 15 ) and air dryer ( 16 ), together with an air inlet ( 2 ) on the air compressor and an air outlet ( 3 ) that leads to the air dryer, while functional units that form the air-inlet path are disposed on the air inlet and functional units that form the air-outlet path are disposed on the air outlet.
  • intake section ( 1 ) which is designed as a combined intake section as air-inlet path units are also used for the air-outlet path.
  • the combination of air compressor and air dryer is provided with a pressure port ( 26 ), by which an air-spring system installed in the passenger car is supplied with air.
  • a first tubular air line ( 4 ) which is connected to an air-line tee ( 10 ), which on the outlet side is connected to the outlet ( 9 ) of an air filter ( 7 ), whose inlet ( 8 ) is connected to a third tubular air line ( 6 ), which ultimately provides the connection to the atmosphere ( 11 );
  • these functional units represent the air-inlet path.
  • Air outlet ( 3 ) is connected via a second tubular air line ( 5 ) to the branch of the air-line tee ( 10 ), so that air discharged by the air outlet flows through air filter ( 7 ) and third tubular air line ( 6 ) to the atmosphere ( 11 ). Together these functional units form the air-outlet path.
  • Air filter ( 7 ) is composed of a pleated unit of air-permeable paper filter elements, which have the ability to retain dirt particles from the air flowing from the atmosphere ( 11 ) to air inlet ( 2 ), thus effecting air cleaning.
  • the air filter In addition to this function as a self-cleaning filter, the air filter also muffles the air noises.
  • Air noises which are produced during intake and especially during venting (venting blast), are very disturbing to the occupants of the passenger car and greatly impair their comfort.
  • a muffler for reducing the noise emission of a combined intake section of an air compressor/air dryer that improves over prior art mufflers.
  • a muffler for use in an air-consuming system comprising a compressed-air generating device including an air compressor, an electric motor for powering the air compressor and an air dryer, a pressure port for pressurizing and venting the air consuming system, an air inlet for sucking air from the atmosphere and an air outlet for discharging air-dryer regenerating air to the atmosphere.
  • An air line connects the air filter to the atmosphere.
  • the muffler is constructed from an air-permeable, sound-absorbing, meshed fabric of thermoplastic threads and is formed as the air line.
  • a multi-functional muffling unit for use in the above described air-consuming system.
  • the multi-functional muffling unit includes an air filtering element and a muffling element.
  • the muffler or multi-functional muffling unit is a compact preassembled unit that is easily coupled to the air-consuming system by use of slip-on joints and clamp joints.
  • the air-lines of one of the previously described air-consuming systems are formed by mandrel-sleeve-joint technique.
  • Another object of the present invention is to provide a muffler that can be manufactured for very low cost while achieving good noise-damping properties.
  • a further object of the present invention is to provide a complete intake section that is constructed as a preassembled, compact component, which can be easily connected to the unit comprising an air compressor and an air dryer by simple slip-on and clamp joints.
  • Another object of the present invention is to provide a muffler wherein the major part of the air lines between the elements of the intake section can be manufactured with mandrel-sleeve joints, which are particularly cost-effective.
  • the present invention accordingly comprises the features of construction, combination of elements, and arrangement of parts which will be exemplified in the constructions hereinafter set forth, and the scope of the invention will be indicated in the claims.
  • FIG. 1 is a schematic diagram of the combined intake section together with the compressed-air generating system comprising an air compressor and an air dryer according to the present invention
  • FIG. 2 is a schematic diagram of a combined intake section according to the prior art
  • FIG. 3 is a perspective view of the inventive combined intake section
  • FIGS. 4 a - c depict various views of the inventive muffler with a noise-damping insert disposed in a connecting hose;
  • FIGS. 5 a - c illustrate how the noise-damping insert is prepared for use
  • FIGS. 6 a - b show an embodiment of the invention in which the noise-damping insert is disposed directly in the air filter itself.
  • compressed-air generating system ( 23 ) comprises an air compressor ( 15 ) powered by an electric motor ( 14 ) and operated together with an air dryer ( 16 ), such as type 899 381 29 2 of WABCO GmbH & Co. OHG, assignee of the present application.
  • the system ( 23 ) is intended for use in pneumatic systems, especially for an air-spring system, for example in a passenger car.
  • air compressor ( 15 ) delivers air from air inlet ( 2 ) via the dryer ( 16 ) and first check valve ( 24 ) to pressure port ( 26 ) for the “consumer” of the air-spring system, which strictly speaking does not consume air but injects it into the air-spring bellows in the manner required by the nature of the closed air-spring system.
  • the compressed air generated during this air-compressor delivery phase is dried in the cartridge of air dryer ( 16 ), in order to avoid icing of valves that may be needed in connection with the air-spring system.
  • the granules of the air-dryer cartridge absorb the moisture contained in the delivered air.
  • venting solenoid valve ( 27 ) is operated by the control unit, whereupon pressure builds up at the pneumatic switching inlet of venting relay valve ( 28 ), thus overcoming the force of the restoring spring and switching the valve to passing condition.
  • Venting from pressure port ( 26 ) takes place via the drying path, opened venting solenoid valve ( 27 ), throttle ( 29 ), second check valve ( 25 ), which is opened counter to its closing direction, air dryer ( 16 ) and venting relay valve ( 28 ), which is switched to passing condition, to air-dryer air outlet ( 3 ).
  • throttle ( 29 ) the drying air stream through air dryer ( 16 ) is greatly reduced, thus ensuring that regeneration of the air-dryer cartridge takes place efficiently, while the large air cross section of opened venting relay valve ( 28 ) ensures that the regeneration air is passed to air outlet ( 3 ) without buildup of dynamic pressure.
  • venting relay valve ( 28 ) can be set to various values via the indicated variable restoring setting of the spring. Below this operating point, venting relay valve ( 28 ) returns to its blocking state, thus preventing the air-spring bellows from being completely vented and destroyed by wrinkling; in this way a residual-pressure holding function is achieved. Furthermore, a safety-valve function is obtained via the pneumatic pilot device, which is shown as a broken line extending from air dryer ( 16 ). This ensures that venting relay valve ( 28 ) will open and thus prevent damage to the system if an air-pressure safety threshold, for example of 16 bar, is exceeded during delivery of air to air dryer ( 16 ).
  • an air-pressure safety threshold for example of 16 bar
  • a combined intake section ( 1 ) is connected to air inlet ( 2 ) and air outlet ( 3 ) of compressed-air generating system ( 23 ).
  • the term “combined” means that a first air line ( 4 ) leading to air inlet ( 2 ) is connected via trunk bore ( 30 ) and branch bore ( 31 ) of an air-line tee ( 10 ) to a second air line ( 5 ) leading to air outlet ( 3 ). Trunk bore ( 30 ) of the air-line tee ( 10 ) leads further to outlet ( 9 ) of air filter ( 7 ).
  • both the intake air to air inlet ( 2 ) and the venting air discharged by air outlet ( 3 ) flow through the air filter, thus cleaning the air compressed in air compressor ( 15 ) and ensuring that the micropores of air filter ( 7 ) are not permanently fouled by the dirt particles from the intake air.
  • combined intake section ( 1 ) is therefore connected to compressed-air supply system ( 23 ), and it connects the system to the atmosphere ( 11 ); this coupling, however, also results in acoustic coupling between the atmosphere and surroundings and thus between the occupants of the vehicle and compressed-air supply system ( 23 ).
  • Compressed-air supply system ( 23 ) produces two kinds of noises: air-compressor running noises and air-dryer air noises.
  • the running noises of the air compressor occur mainly during air delivery, in the form of running noises in the motor bearing, in the connecting-rod bearing and in the region of the piston ring of the air-compressor delivery piston; a particularly important contribution to these noises results from the point of intake from the atmosphere ( 11 ) being directly connected acoustically to the crankcase of air compressor ( 15 ).
  • the air noises caused during air drying include a whistling sound, which occurs during air-dryer regeneration as the air, throttled via throttle ( 29 ), escapes from the air-spring bellows to the atmosphere ( 11 ).
  • the main problem in addition to these whistling noises is a very disturbing venting blast, which occurs at the beginning of air-dryer regeneration.
  • the delivery pressure of air compressor ( 15 ) is present directly at the inlet of air dryer ( 16 ).
  • This can have a value of 16 bar, for example, and so the volume of the air-dryer cartridge is filled with 16-bar air. Because of the well-sealed effect of the overall system, this high air pressure persists even in the time following delivery by the air compressor. In many cases, the air-dryer cartridge volume is still under relatively high pressure even at the beginning of changeover of relay valve ( 28 ) for initiation of the air-dryer regeneration process.
  • venting relay valve ( 28 ) When venting relay valve ( 28 ) opens, the air-dryer cartridge, which is under high pressure, is therefore suddenly depressurized via the large free cross section of opened venting relay valve ( 28 ), air outlet ( 3 ) and combined intake section ( 1 ) leading to the atmosphere ( 11 ), thus producing the aforesaid highly audible venting blast.
  • the noise-damping measures described hereinafter are intended in particular to damp these highly audible regeneration venting blasts appropriately, as well as the running noises and venting whistles described hereinabove.
  • the third air line ( 6 ) is itself designed as an acoustic damping device or muffler, by the fact that a sound-absorbing insulating material ( 12 ) is installed in this line itself; this is indicated in FIG. 1 with the circuit-diagram symbol for a muffler.
  • third air line ( 6 ) preferably has a larger diameter such as, for example, 10 mm.
  • third air line ( 6 ) is intentionally designed as a flexible rubber hose; this, in its own right, already contributes to noise reduction, because the air molecules in the air stream are not reflected at, for example, the surface of a plastic tube, which can be even and hard, but impinge on the uneven and elastically compliant inside surface of the hose, losing their energy by interaction.
  • FIG. 3 the manner in which sound-absorbing insulating material ( 12 ) is installed in third air line ( 6 ) is illustrated by means of a partial section through third air line ( 6 ); it has the form of a roll of knitted fabric, as shown in FIG. 5.
  • FIGS. 5 a - c illustrate how this knitted-fabric roll ( 12 ) is prepared.
  • the basic material is, desirably, a hose-like gauze produced on a circular knitting machine for thermoplastic materials.
  • it is desirably a knitted fabric comprising thermoplastic threads looped together with one another.
  • the threads have a rectangular cross section of, for example, 0.02 ⁇ 0.08 mm, and the looping process produces meshes in a density of, for example, 30 meshes per 100 mm of length.
  • this knitted-fabric hose is trimmed to a length such as 90 mm in a first working step, to produce a hose portion ( 17 ).
  • hose portion ( 17 ) is heat-sealed along its cut surfaces (heat-sealed seams ( 32 )), thus forming a rectangular knitted-fabric insert ( 18 ) with a thickness of 2 to 2.5 mm (FIG. 5 b ).
  • Knitted-fabric insert ( 18 ) is then rolled up around one of its long edges to form a knitted-fabric roll ( 12 ) (FIG. 5 c ).
  • This knitted-fabric roll ( 12 ) is finally pushed into third air line ( 6 ).
  • FIGS. 4 a - c show pushed-in roll ( 12 ) in longitudinal section (A-A) and cross section (C-C).
  • the pushing-in process is simplified by the elastic nature of the third air line ( 6 ); the connecting hose is expanded by a suitable spreading tool, and knitted-fabric roll ( 12 ) is then inserted into expanded third air line ( 6 ) by means of a further tool.
  • knitted-fabric roll ( 12 ) installed in third air line ( 6 ) achieves noise damping in the invention by the fact that the air continuously experiences cross-sectional changes while flowing through line ( 6 ), whereby friction effects leading to noise damping are produced.
  • third air line ( 6 ) is narrowed (e.g., to a cross section of 6 mm) at its outlet point to the atmosphere ( 11 ), and so a throttle ( 13 ) is formed there.
  • This throttle causes development of a slight dynamic pressure, thus reducing the flow velocity in third air line ( 6 ) and in this way having an additional noise-reducing effect.
  • knitted-fabric roll ( 12 ) in third air line ( 6 ) adds further noise damping of 13 dB (A), and throttle ( 13 ) then reduces the noise level by a further 3 dB (A).
  • noise damping totaling 16 dB (A) is achieved with the invention, while all damping measures together result in total noise damping of 19 dB (A).
  • FIG. 3 shows that the combined intake section ( 1 ) can be constructed as a compact functional unit, equipped with slip-on pneumatic fittings, a fitting ( 19 ), coupled with first air line ( 4 ), for insertion into port ( 2 ) of the air inlet, and a fitting ( 20 ), coupled with the second air line ( 5 ), for insertion into port ( 3 ) of the air outlet.
  • a fitting ( 19 ) coupled with first air line ( 4 ), for insertion into port ( 2 ) of the air inlet
  • a fitting ( 20 ) coupled with the second air line ( 5 ), for insertion into port ( 3 ) of the air outlet.
  • third air line ( 6 ) in the region of the outlet to the atmosphere, there is molded on a rubber double bead ( 35 ), which can be inserted very simply into a groove-like recess in order to fasten third air line ( 6 ).
  • a completely preassembled intake section can be installed by being slipped onto or clamped onto compressed-air generating system ( 23 ), which is also preassembled.
  • FIG. 3 also shows a particularly cost-effective assembly of the lines and elements of inventive combined intake section ( 1 ).
  • Fitting ( 19 ) is connected to first air line ( 4 ), which in turn is connected to branch ( 31 ) of tee ( 10 ) in the form of a pneumatic sleeve joint; in the same way, air filter ( 7 ) is connected via its outlet ( 9 ) to trunk port ( 30 ) of tee ( 10 ), this trunk port is connected to second air line ( 5 ), and this line is connected to fitting ( 20 ).
  • a tubular air line is simultaneously used as a fastening means, by the fact that it is pushed with a tool over the element to be coupled, thus forming a pressure-tight joint.
  • the respective enveloping parts of a joint are shown as “corrugated” elements ( 36 ) in FIG. 3.
  • the mandrel-sleeve-joint technique represents a very inexpensive connection method and it is desirable to use the technique whenever possible, for example at the coupling of fitting ( 19 ) with first air line ( 4 ). It should be understood that the coupling to third air line ( 6 ) is not amenable to this technique. Desirably, a hose clamp ( 37 ) is used instead to secure the enveloping part of third air line ( 6 ).
  • FIGS. 6 a,b Another configuration of the invention is illustrated in FIGS. 6 a,b.
  • the sound-absorbing insulating material ( 12 ) is repositioned from third air line ( 6 ) to air filter ( 7 ), so that this is formed as a combined functional unit ( 21 ) comprising a filter and a muffler.
  • Air filter ( 7 ) is illustrated in FIG. 6 a
  • functional unit ( 21 ) comprising a filter and a muffler is illustrated in FIG. 6 b.
  • Air filter ( 7 ) has the form of a cylindrical hollow body provided with inlet ( 8 ) and outlet ( 9 ), (explained hereinabove) which are molded onto a lower housing part ( 38 ) and upper housing part ( 39 ), which were initially separate parts ( 38 , 39 ).
  • a first insert cartridge ( 40 ) which is made of air-permeable paper filter elements.
  • first insert cartridge ( 40 ) of the air filter is placed in the cavity of one of the housing parts (for example, ( 38 )), after which the respective other housing part (( 39 ) in the example) is slipped on over installed first insert cartridge ( 40 ) and the two housing parts ( 38 , 39 ) are heat-sealed to one another by an airtight seam ( 49 ).
  • one of the two housing parts ( 38 , 39 ), which can have the same construction, has sufficiently enlarged overall length—in the example of FIG. 6 b, this is upper housing part ( 39 )—that a second cartridge ( 41 ), made of the explained air-permeable and sound-absorbing insulating material ( 12 ), can be provided in the cylindrical interior space of functional unit ( 21 ), in addition to cartridge ( 40 ) which, as the first cartridge, is disposed directly at outlet ( 9 ) of functional unit ( 21 ).
  • the sound-absorbing insulating material ( 12 ) of second cartridge ( 41 ) is again desirably made of a meshed fabric of thermoplastic threads connected to one another, and is shaped in the form of a knitted-fabric roll; this knitted-fabric roll ( 12 ) is no longer an elongated cylindrical body with small diameter, but instead is a short cylindrical body with large diameter. Installation takes place by inserting first and second cartridges ( 40 , 41 ) into empty housing parts ( 38 , 39 ) and joining two housing parts ( 38 , 39 ) by an airtight heat seal ( 49 ).
  • the sound-absorbing insulating material ( 12 ) is disposed between first cartridge ( 40 ) and the connection to the atmosphere ( 11 ) of third air line ( 6 ), which is connected in the manner explained hereinabove to inlet ( 8 ) of functional unit ( 21 ).
  • third air line ( 6 ) is empty. Nevertheless, for the reasons explained hereinabove, it is provided with throttle ( 13 ) at the connection to atmosphere ( 11 ) in this configuration also.
  • the basic construction of combined intake section ( 1 ) therefore continues to be similar to the configuration illustrated in FIG. 3.
  • first cartridge ( 40 ), which is inserted in the air filter, has a diameter of 40 mm and a length of 60 mm
  • second cartridge ( 41 ) which is inserted in the muffler, has the same diameter but a length, for example, of 30 mm.
  • second cartridge ( 41 ) can be made somewhat more simply.
  • insertion of this second cartridge ( 41 ) into housing ( 38 , 39 ) is simplified as compared with the process of pushing elongated knitted-fabric roll ( 12 ) into third air line ( 6 ), which is expanded by a tool.
  • a further advantage is that more room for sound-absorbing insulating material ( 12 ) is available in housing ( 38 , 39 ) of functional unit ( 21 ) as such than is the case in third air line ( 6 ) for sound-absorbing insulating material ( 12 ) according to FIGS. 4 a - c.
  • the present invention provides a muffler that can be manufactured at a low cost while achieving improved noise emission reduction over prior art mufflers.
  • Embodiments of the present invention may be constructed as a preassembled compact component, which can be easily connected to an air spring system.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Compressor (AREA)
  • Air-Conditioning For Vehicles (AREA)
US10/685,716 2002-10-16 2003-10-15 Muffler for air compressor Abandoned US20040126247A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10248183A DE10248183A1 (de) 2002-10-16 2002-10-16 Geräuschdämpfungseinrichtung für Luftpresser
DE10248183.0 2002-10-16

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EP (1) EP1411244B2 (de)
DE (1) DE10248183A1 (de)

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US20060171819A1 (en) * 2005-01-31 2006-08-03 York International Corporation Compressor discharge muffler
US20080156580A1 (en) * 2004-07-23 2008-07-03 Hendrik Harting Fibre for an Acoustic Insulating Material, Especially for Sound Dampers Compressed Air Devices
US20080289900A1 (en) * 2004-07-24 2008-11-27 Bernd Christoffers Noise Damper for a Compressed Air Device
WO2009079727A1 (en) * 2007-12-26 2009-07-02 Whirlpool S.A. System for attenuating pulsation in the gas discharge of a refrigeration compressor
US20100111719A1 (en) * 2008-11-04 2010-05-06 Wen San Chou Air compressor having quick coupling device
US20110033324A1 (en) * 2009-08-10 2011-02-10 Schaefer James A Compressor Having Counterweight Cover
US20110168481A1 (en) * 2008-06-20 2011-07-14 Hendrik Harting Sound Damper for Compressed Air Systems of Vehicles
US8328741B2 (en) 2009-09-29 2012-12-11 Covidien Lp Pneumatic compression garment with noise attenuating means
US20130042932A1 (en) * 2010-06-24 2013-02-21 Wabco Gmbh Air Supply Device for a Vehicle Having Pneumatic Devices
US20130058802A1 (en) * 2010-05-18 2013-03-07 Graco Minnesota Inc. Low ice pneumatic motor exhaust muffler
US8469910B2 (en) 2009-09-29 2013-06-25 Covidien Lp Pneumatic compression garment with noise attenuating means
US9572720B2 (en) 2009-09-29 2017-02-21 Covidien Lp Reduced noise pneumatic compression garment
US10221769B2 (en) 2016-12-02 2019-03-05 General Electric Company System and apparatus for gas turbine combustor inner cap and extended resonating tubes
US10220474B2 (en) 2016-12-02 2019-03-05 General Electricd Company Method and apparatus for gas turbine combustor inner cap and high frequency acoustic dampers
US10228138B2 (en) 2016-12-02 2019-03-12 General Electric Company System and apparatus for gas turbine combustor inner cap and resonating tubes
EP3734071A1 (de) * 2019-04-29 2020-11-04 Stephen Marsh Boyer Geräusch- und vibrationsdämpfungseinheit
US11221088B2 (en) 2018-08-20 2022-01-11 Continental Teves Ag & Co. Ohg Method for actuating a solenoid valve, and compressed-air installation comprising a solenoid valve
WO2022081035A1 (en) * 2020-10-14 2022-04-21 Qatar Foundation For Education, Science And Community Development Air curtain device and air circulation system having the same
US11506382B2 (en) 2019-09-12 2022-11-22 General Electric Company System and method for acoustic dampers with multiple volumes in a combustion chamber front panel
US11578714B2 (en) 2019-12-02 2023-02-14 Winsupply 0207 Acq Co. Pneumatic muffler for desiccant air dryer

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DE102004036251C5 (de) * 2004-07-26 2018-05-03 Wabco Gmbh Verfahren zur Restdruckhaltung in einem Luftfederbalg einer Tragachse
DE102011085045B4 (de) * 2011-10-21 2020-03-19 Thoenes Dichtungstechnik Gmbh Schalldämpfer und Verfahren zu seiner Herstellung
DE102012010690B4 (de) * 2012-05-30 2018-11-08 Faurecia Autositze Gmbh Kraftfahrzeugsitz
DE202016102158U1 (de) 2016-04-22 2016-05-12 Thoenes Dichtungstechnik Gmbh Schalldämpfermaterial und Schalldämpfer
DE102017210431A1 (de) 2016-08-19 2018-02-22 Continental Teves Ag & Co. Ohg Schalldämpfer für eine Druckluftanlage
DE102018004127A1 (de) 2018-05-23 2018-11-29 Daimler Ag Verfahren zum Betreiben eines Druckluftsystems sowie Steuereinrichtung, Druckluftsystem und Fahrzeug
DE102022208399A1 (de) 2022-08-12 2024-02-15 Continental Automotive Technologies GmbH Luftkompressorsystem
DE102022121117A1 (de) 2022-08-22 2024-02-22 Zf Cv Systems Europe Bv Entlüftungsendstück und pneumatisches System, insbesondere Druckluftversorgungsanlage

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