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US20080302596A1 - Diaphragm Muffler and Method of Use - Google Patents

Diaphragm Muffler and Method of Use Download PDF

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Publication number
US20080302596A1
US20080302596A1 US12/133,663 US13366308A US2008302596A1 US 20080302596 A1 US20080302596 A1 US 20080302596A1 US 13366308 A US13366308 A US 13366308A US 2008302596 A1 US2008302596 A1 US 2008302596A1
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US
United States
Prior art keywords
diaphragm
stream
atmospheric pressure
pressure
compressor
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.)
Abandoned
Application number
US12/133,663
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English (en)
Inventor
Steven M. Harrington
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.)
Chart Sequal Technologies Inc
Original Assignee
Sequal Technologies Inc
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 Sequal Technologies Inc filed Critical Sequal Technologies Inc
Priority to US12/133,663 priority Critical patent/US20080302596A1/en
Assigned to SEQUAL TECHNOLOGIES, INC. reassignment SEQUAL TECHNOLOGIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HARRINGTON, STEVEN M.
Publication of US20080302596A1 publication Critical patent/US20080302596A1/en
Assigned to SILICON VALLEY BANK reassignment SILICON VALLEY BANK ADDENDUM TO REEL/FRAME - 019331/0819 Assignors: SEQUAL TECHNOLOGIES INC.
Assigned to SEQUAL TECHNOLOGIES, INC. reassignment SEQUAL TECHNOLOGIES, INC. RELEASE Assignors: SILICON VALLEY BANK
Assigned to JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT reassignment JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT SECURITY AGREEMENT Assignors: CHART SEQUAL TECHNOLOGIES INC.
Assigned to CHART SEQUAL TECHNOLOGIES INC. reassignment CHART SEQUAL TECHNOLOGIES INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SEQUAL TECHNOLOGIES, INC.
Assigned to CAIRE INC. reassignment CAIRE INC. RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT
Abandoned legal-status Critical Current

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Images

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
    • F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
    • F04B39/0061—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes using muffler volumes
    • 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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/06—Silencing
    • F04C29/065—Noise dampening volumes, e.g. muffler chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • F04D29/665—Sound attenuation by means of resonance chambers or interference
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2256/00—Main component in the product gas stream after treatment
    • B01D2256/12—Oxygen
    • 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
    • B01D2259/4533—Gas separation or purification devices adapted for specific applications for medical purposes
    • 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
    • B01D2259/4541—Gas separation or purification devices adapted for specific applications for portable use, e.g. gas masks
    • 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
    • B01D53/0446—Means for feeding or distributing gases
    • 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
    • B01D53/047—Pressure swing adsorption
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/12—Vibration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
    • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum

Definitions

  • the field of this invention relates to devices and methods for quieting systems such as compressor systems, which generate pressure pulses and vacuum pulses during operation.
  • Portable oxygen concentrators are commonly used in the home medical market to treat ambulatory patients with chronic obstructive pulmonary diseases. To make an oxygen concentrator portable, the oxygen concentrator must be as small as possible and weigh as little as possible while delivering sufficient concentrated oxygen gas flow to the ambulatory patient. Because a portable oxygen concentrator is used in a variety of different environments where low noise levels are important (e.g., restaurants, places or worship, libraries), it is important for the portable oxygen concentrator to be quiet during operation.
  • Air compressors are used in oxygen concentrators to supply high-pressure feed air to a Pressure Swing Adsorption (PSA) Module or concentrator. Air compressors, especially combined compressor and vacuum pumps, are relatively noisy during operation because pressure and vacuum pulses are generated simultaneously during operation, and these pressure and vacuum pulses generate noise.
  • PSA Pressure Swing Adsorption
  • an aspect of present invention involves a compact muffler that reduces sound without the flow losses of tortuous path mufflers or the large size of Helmholtz resonators.
  • the compact muffler is used in devices where a pulsating exhaust stream and a pulsating intake stream, which are at similar pressures, both need to be muffled.
  • the compact muffler includes two chambers separated by a diaphragm wherein vacuum pulses from one stream may be canceled against pressure pulses in another stream by means of the diaphragm which allows pressure and volume to be exchanged between each stream, while not allowing the streams to intermix.
  • a further aspect of the invention involves a diaphragm muffler for quiet operation of a compressor, the compressor imparting an above atmospheric pressure stream and a below atmospheric pressure stream.
  • the diaphragm muffler including a diaphragm pressure chamber receiving the above atmospheric pressure stream; a diaphragm vacuum chamber receiving the below atmospheric pressure stream; and a flexible diaphragm dividing the diaphragm pressure chamber receiving the above atmospheric pressure stream from the diaphragm vacuum chamber receiving the below atmospheric pressure stream, whereby the above atmospheric pressure stream and the below atmospheric pressure stream cancel each other out via the flexible diaphragm.
  • Another aspect of the invention involves a method of using a diaphragm muffler.
  • the method includes receiving above atmospheric pressure stream in the diaphragm pressure chamber of the diaphragm muffler described immediately above; receiving below atmospheric pressure stream in the diaphragm vacuum chamber; and using the flexible diaphragm for canceling out the above atmospheric pressure stream and the below atmospheric pressure stream without mixing the above atmospheric pressure stream and the below atmospheric pressure stream.
  • FIG. 1 is a simple schematic of an embodiment of a gas separation device, which is an exemplary system/environment for the diaphragm muffler.
  • FIG. 2 is an cross-sectional view of a diaphragm muffler constructed in accordance with an embodiment of the invention.
  • FIG. 3A is perspective view of an embodiment of compressor system with portions of a housing removed, and illustrates another embodiment of diaphragm muffler.
  • FIG. 3B is another perspective view of an embodiment of compressor system with portions of a housing removed, similar to FIG. 3A .
  • FIG. 4 is perspective view of the compressor system of FIG. 3 with substantially the entire housing shown, and illustrates an external view of the diaphragm muffler.
  • the gas separation device 10 may include a compressor 20 (e.g., rotary piston air compressor, diaphragm-type air compressor), which may be combination compressor/vacuum generator (hereinafter “compressor”), a Pressure Swing Adsorption (PSA) Module or concentrator 30 , a measurement mechanism 40 , and a flow control mechanism 50 .
  • a compressor 20 e.g., rotary piston air compressor, diaphragm-type air compressor
  • PSA Pressure Swing Adsorption
  • the gas separation device 10 is a portable oxygen concentrator weighing in the range of 2-20 pounds.
  • An example portable oxygen concentrator system that comprises the gas separation device 10 is shown and described in U.S. Pat. No. 6,691,702, which is hereby incorporated by reference herein as though set forth in full.
  • the portable oxygen concentrator system 100 and described with reference to FIGS. 1-16 , and especially FIGS. 1 , 2 , 12 , 15 , and 16 may be used as the gas separation device 10 .
  • a feed fluid such as ambient air may be drawn into the compressor 20 and delivered under high pressure to the PSA Module 30 .
  • the compressor 20 is a combination compressor and vacuum pump/generator.
  • the vacuum generator is preferably driven by the same motor as the compressor and is integrated with the compressor.
  • the vacuum generator draws exhaust gas from the PSA module 30 to improve the recovery and productivity of the PSA module 30 .
  • the PSA module 30 separates a desired product fluid (e.g., oxygen) from the feed fluid (e.g., air) and expels exhaust fluid. Characteristics of the product fluid (e.g., flow/purity) may be measured by a measurement mechanism 40 . Delivery of the product fluid may be controlled with the flow control mechanism 50 .
  • the diaphragm muffler 100 includes a diaphragm housing 110 , which has curved surfaces to resist flexure due to internal pressure fluctuations and an internal surface that may be lined with sound attenuating material, a pressure inlet 120 and a pressure outlet 130 to conduct pressure fluctuations from the outlet of the compressor 20 , a diaphragm pressure chamber 140 communicating with the pressure inlet 120 and the pressure outlet 130 , a vacuum inlet 150 and a vacuum outlet 160 to conduct vacuum fluctuations from the inlet of the compressor 20 , a diaphragm vacuum chamber 170 communicating with the vacuum inlet 150 and the vacuum outlet 160 , and a diaphragm 180 .
  • the diaphragm muffler volume is substantially the same volume as the compressor volume, about 10 cc for a 30 liter/minute compressor. In a preferred embodiment, the diaphragm muffler volume is less than 30 cc. In a more preferred embodiment, diaphragm muffler volume is less than 20 cc. In a most preferred embodiment, diaphragm muffler volume is less than 15 cc.
  • the diaphragm 180 physically separates the pressure gases and the vacuum gases, and allows the pressure fluctuations from a high pressure portion of the compressor 20 to cancel out the pressure fluctuations from the vacuum portion of the compressor 20 .
  • the diaphragm material should be flexible and thin, so that it reacts to pressure fluctuations in the air and it should be long lasting. Silicone rubber, approximately 1 mm thick is ideal.
  • An interior wall surface of diaphragm housing 110 and opposite sides of diaphragm 180 define the diaphragm pressure chamber 140 and the diaphragm vacuum chamber 170 .
  • Conduits (not shown) to and from the compressor 20 are configured to have lengths and diameters that create appropriate delays so that the pressure and vacuum pulsations cancel out in the diaphragm muffler 100 to the greatest possible degree.
  • the inlet and outlet conduits are directed toward the diaphragm 180 to maximize the movement of the diaphragm and thereby the attenuation of the pulsations.
  • the diaphragm muffler 100 will now be described in use.
  • the vacuum generator draws exhaust gas (exhaust stream) from the PSA module 30 in pulses.
  • This pulsating exhaust stream below atmospheric pressure enters the diaphragm vacuum chamber 170 via the vacuum inlet 150 and exits the diaphragm vacuum chamber 170 via the vacuum outlet 160 .
  • feed fluid (intake stream) under high pressure is delivered in pulses by the compressor 20 to the PSA module 30 .
  • This pulsating pressure stream above atmospheric pressure enters the diaphragm pressure chamber 140 via the pressure inlet 120 and exits the diaphragm pressure chamber 140 via the pressure outlet 130 .
  • FIGS. 3A , 3 B, and 4 are perspective views of an embodiment of compressor system 200 including a combination compressor/vacuum generator (hereinafter “compressor”) 220 , and a compressor system housing 230 .
  • the compressor system housing 230 includes a diaphragm muffler 300 similar to the diaphragm muffler 100 describe above with respect to FIG. 2 .
  • the diaphragm muffler 300 includes a diaphragm housing 310 that is integral with the compressor system housing 230 , a pressure inlet 320 and a pressure outlet 330 to conduct pressure fluctuations from the outlet of the compressor 220 , a diaphragm pressure chamber 340 communicating with the pressure inlet 320 and the pressure outlet 330 , a vacuum inlet 350 and a vacuum outlet 360 to conduct vacuum fluctuations from the outlet of the vacuum pump of compressor 20 , a diaphragm vacuum chamber 370 communicating with the vacuum inlet 350 and the vacuum outlet 360 , and a diaphragm 380 .
  • the diaphragm muffler 300 is used in a similar manner as the diaphragm muffler 100 described above, and, therefore, the use of the diaphragm muffler 300 will not be described in further detail.
  • the diaphragm muffler 100 , 300 is a compact muffler that reduces sound by having the pulsating exhaust stream and the pulsating intake stream, which are at similar pressures, cancel each other out without mixing the streams.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Separation Of Gases By Adsorption (AREA)
  • Compressor (AREA)
US12/133,663 2007-06-08 2008-06-05 Diaphragm Muffler and Method of Use Abandoned US20080302596A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/133,663 US20080302596A1 (en) 2007-06-08 2008-06-05 Diaphragm Muffler and Method of Use

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US93367507P 2007-06-08 2007-06-08
US12/133,663 US20080302596A1 (en) 2007-06-08 2008-06-05 Diaphragm Muffler and Method of Use

Publications (1)

Publication Number Publication Date
US20080302596A1 true US20080302596A1 (en) 2008-12-11

Family

ID=40094818

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/133,663 Abandoned US20080302596A1 (en) 2007-06-08 2008-06-05 Diaphragm Muffler and Method of Use

Country Status (3)

Country Link
US (1) US20080302596A1 (fr)
TW (1) TW200905080A (fr)
WO (1) WO2008154276A2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102200110A (zh) * 2011-01-21 2011-09-28 佛山市广顺电器有限公司 一种进气活塞消音结构
US20140161640A1 (en) * 2012-12-11 2014-06-12 Hella Kgaa Hueck & Co. Pump
US20140199188A1 (en) * 2013-01-14 2014-07-17 Ingersoll-Rand Company Diaphragm Pump With Muffler-Mounted Sensor
WO2014151461A1 (fr) * 2013-03-15 2014-09-25 Eaton Corporation Suppression du bruit par accord de phase de conduits communicants d'un compresseur roots et d'un détendeur roots
US10731641B2 (en) 2013-01-14 2020-08-04 Ingersoll-Rand Industrial U.S., Inc. Diaphragm pump with sensor mount

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2047775A (en) * 1933-09-01 1936-07-14 Walker Mfg Co Vacuum muffler
US3867963A (en) * 1972-11-14 1975-02-25 Allan Ballard Pulsation reducer
US4491459A (en) * 1983-05-04 1985-01-01 Pinkerton Charles J Portable oxygen enrichment and concentration system
US4514151A (en) * 1980-11-24 1985-04-30 Christian Anders Liquid pulsation dampener device
US4573879A (en) * 1983-06-24 1986-03-04 Matsushita Refrigeration Company Rotary compressor
US5183974A (en) * 1992-04-03 1993-02-02 General Motors Corporation Gas pulsation attenuator for automotive air conditioning compressor
US5797430A (en) * 1993-06-04 1998-08-25 Mercedes-Benz Ag Adaptive hydropneumatic pulsation damper
US20010001939A1 (en) * 1997-01-30 2001-05-31 James Smolarek System for energy recovery in a vacuum pressure swing adsorption apparatus
US6615658B2 (en) * 1999-08-03 2003-09-09 Charles Darwin Snelling Method and apparatus for detecting the internal liquid level in a vessel
US6629525B2 (en) * 2000-08-03 2003-10-07 Sequal Technologies, Inc. Portable oxygen concentration system and method of using the same
US6691702B2 (en) * 2000-08-03 2004-02-17 Sequal Technologies, Inc. Portable oxygen concentration system and method of using the same
US20040150146A1 (en) * 1996-05-21 2004-08-05 Toyoda Gosei Co., Ltd. Liquid-sealing type variation isolating apparatus
US20050257686A1 (en) * 2004-05-21 2005-11-24 Occhialini James M Weight-optimized portable oxygen concentrator
US20060011065A1 (en) * 2004-07-19 2006-01-19 Hastings John M Inlet nozzle for oxygen concentrator
US7032709B2 (en) * 2002-08-27 2006-04-25 Andreas Stihl Ag & Co. Kg Exhaust-gas muffler
US20060230931A1 (en) * 2005-04-05 2006-10-19 Bliss Peter L Portable oxygen concentrator
US7179326B2 (en) * 2002-03-05 2007-02-20 Teijin Limited Oxygen concentration apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000016521U (ko) * 1999-02-03 2000-09-25 배길훈 자동차용 에어컨시스템의 진공액튜에이터

Patent Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2047775A (en) * 1933-09-01 1936-07-14 Walker Mfg Co Vacuum muffler
US3867963A (en) * 1972-11-14 1975-02-25 Allan Ballard Pulsation reducer
US4514151A (en) * 1980-11-24 1985-04-30 Christian Anders Liquid pulsation dampener device
US4491459A (en) * 1983-05-04 1985-01-01 Pinkerton Charles J Portable oxygen enrichment and concentration system
US4573879A (en) * 1983-06-24 1986-03-04 Matsushita Refrigeration Company Rotary compressor
US5183974A (en) * 1992-04-03 1993-02-02 General Motors Corporation Gas pulsation attenuator for automotive air conditioning compressor
US5797430A (en) * 1993-06-04 1998-08-25 Mercedes-Benz Ag Adaptive hydropneumatic pulsation damper
US20040150146A1 (en) * 1996-05-21 2004-08-05 Toyoda Gosei Co., Ltd. Liquid-sealing type variation isolating apparatus
US20010001939A1 (en) * 1997-01-30 2001-05-31 James Smolarek System for energy recovery in a vacuum pressure swing adsorption apparatus
US6615658B2 (en) * 1999-08-03 2003-09-09 Charles Darwin Snelling Method and apparatus for detecting the internal liquid level in a vessel
US6691702B2 (en) * 2000-08-03 2004-02-17 Sequal Technologies, Inc. Portable oxygen concentration system and method of using the same
US6629525B2 (en) * 2000-08-03 2003-10-07 Sequal Technologies, Inc. Portable oxygen concentration system and method of using the same
US7179326B2 (en) * 2002-03-05 2007-02-20 Teijin Limited Oxygen concentration apparatus
US7032709B2 (en) * 2002-08-27 2006-04-25 Andreas Stihl Ag & Co. Kg Exhaust-gas muffler
US20050257686A1 (en) * 2004-05-21 2005-11-24 Occhialini James M Weight-optimized portable oxygen concentrator
US7279029B2 (en) * 2004-05-21 2007-10-09 Air Products And Chemicals, Inc. Weight-optimized portable oxygen concentrator
US7473299B2 (en) * 2004-05-21 2009-01-06 Air Products And Chemicals, Inc. Weight-optimized portable oxygen concentrator
US20060011065A1 (en) * 2004-07-19 2006-01-19 Hastings John M Inlet nozzle for oxygen concentrator
US20060230931A1 (en) * 2005-04-05 2006-10-19 Bliss Peter L Portable oxygen concentrator

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102200110A (zh) * 2011-01-21 2011-09-28 佛山市广顺电器有限公司 一种进气活塞消音结构
US20140161640A1 (en) * 2012-12-11 2014-06-12 Hella Kgaa Hueck & Co. Pump
US9429159B2 (en) * 2012-12-11 2016-08-30 Hella Kgaa Hueck & Co. Pump
US20140199188A1 (en) * 2013-01-14 2014-07-17 Ingersoll-Rand Company Diaphragm Pump With Muffler-Mounted Sensor
US9284956B2 (en) * 2013-01-14 2016-03-15 Ingersoll-Rand Company Diaphragm pump with muffler-mounted sensor
US10731641B2 (en) 2013-01-14 2020-08-04 Ingersoll-Rand Industrial U.S., Inc. Diaphragm pump with sensor mount
WO2014151461A1 (fr) * 2013-03-15 2014-09-25 Eaton Corporation Suppression du bruit par accord de phase de conduits communicants d'un compresseur roots et d'un détendeur roots

Also Published As

Publication number Publication date
TW200905080A (en) 2009-02-01
WO2008154276A3 (fr) 2009-02-19
WO2008154276A2 (fr) 2008-12-18

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