US3366314A - Rotary vacuum pump of the liquid-ring type - Google Patents

Rotary vacuum pump of the liquid-ring type Download PDF

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Publication number
US3366314A
US3366314A US494807A US49480765A US3366314A US 3366314 A US3366314 A US 3366314A US 494807 A US494807 A US 494807A US 49480765 A US49480765 A US 49480765A US 3366314 A US3366314 A US 3366314A
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US
United States
Prior art keywords
liquid
pump
valve plate
openings
pressure
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.)
Expired - Lifetime
Application number
US494807A
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English (en)
Inventor
Schroder Erich
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.)
Siemens Schuckertwerke AG
Siemens AG
Original Assignee
Siemens AG
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Filing date
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Publication of US3366314A publication Critical patent/US3366314A/en
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Classifications

    • 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
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
    • F04C29/126—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type
    • 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
    • F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
    • F04C19/005—Details concerning the admission or discharge
    • F04C19/007—Port members in the form of side plates
    • 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
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
    • F04C29/126—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type
    • F04C29/128—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type of the elastic type, e.g. reed valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7859—Single head, plural ports in parallel

Definitions

  • Rotary vacuum pump of the liquid-ring type comprising a stationary structure forming a housing and having a suction port and a pressure port, a multi-blade rotor rotatable in the housing and forming peripherally sequential cells for entraining gas through the suction port and passing it compressed through the suction port, the structure having a number of openings through which the cells communicate with the outside of the structure, the openings being situated close to the pressure port at respective localities ahead of the pressure port relative to the direction of rotor rotation, the peripherally sequential cells, respectively, defining with the structure a compression terminal space adapted to sweep past the openings successively and being variable in volume in accordance with suction pressure applied through the openings, at single flexible check-valve plate common to the openings and sealingly engageable with the structure for jointly closing the openings under external pressure, the valve plate being displaceably mounted on the structure for successively closing a varying number of the openings progressively in the direction of rotor rotation by external
  • My invention relates to rotary gas pumps for producing or maintaining a vacuum under changing pressure conditions.
  • the invention concerns rotary vacuum pumps of the liquid-ring type, also called liquid-piston type.
  • This terminal space is bordered by the control discs or surfaces of the pump housing, by the ring-shaped body of liquid rotating in the housing, by the hub of the multi-blade rotor, and by the position of the particular rotor blade cell in which the ultimate pressure, usually atmospheric pressure, is attained. It is known to make this terminal space variable by providing the control plate or housing of the pump with a number of bores which are located just ahead of the pressure outlet port and are closed on the back pressure or check-valve principle, the outer openings of the bores being located in liquid, such as oil or water.
  • checkvalve bores By virtue of these checkvalve bores, gas can escape from the interior of the pump into the liquid-filled surrounding space if the pressure in the pump becomes excessive. On the other hand, the check-valve bores prevent expelled gas from passing back into the working space of the pump if the latter is under lower pressure than obtains in the environment space of the pump.
  • FIG. 2 shows a section through the check-valve portion of a pump according to the prior art.
  • FIG. 3 shows a section along the line III-III in FIG. 4;
  • FIG. 4 is a partial lateral view of a pump according to the invention, this pump being otherwise in accordance with FIG. 1.
  • the housing of the illustrated pump is denoted by P and the multi-blade rotor by L, the blades of the rotor being represented by broken lines.
  • the rotor is mounted in eccentric relation to the pump housing. It should be understood, however, that in some known pumps the rotor is mounted in concentric relation to the housing but the latter is given an elliptical interior cross section.
  • the housing is partially filled with liquid, such as water or oil, so that, during rotation of the rotor, the liquid is caused by centrifugal force to form a rotating ring along the inner periphery of the housing. This ring of liquid enters to a larger or smaller extent into the respective cells formed between each two adjacent rotor blades.
  • the eccentricity of the liquid ring causes the volume of the gas chamber within each cell to change continuously, thus compressing the gas which enters into the cell spaces through an inlet port.
  • the inlet port is constituted by a relatively long suction slot 4 which communicates with the vessel or other enclosed space to be evacuated.
  • the gas progressively compressed in the cell chambers as the cells travel clockwise with the rotor, leaves the pump through an outlet port or pressure slot 2 which is considerably smaller than the suction slot 4.
  • Located just ahead of the pressure slot 2 are a number of bores 3 which, as explained above, permit the escape of gas from the working space of the rotor when the pressure in this space is too high, and also permit a flow of gas in the opposite direction if the pressure in the rotor is too low.
  • valve balls 5 which are individually movable in a valve cage 6 and which open and close the respective bores in accordance with the pressure conditions just mentioned.
  • Another object of my invention is to aiford controlling or adjusting the displacement of the check-valve means in a liquid-ring pump in order to improve its adaptability to particular operating conditions.
  • Still another object of the invention is to devise a liquidring pump which is less sensitive to detrimental effects of impurities and exhibits a considerably smaller amount of wear than those heretofore available.
  • I provide a single flexible check-valve plate common to the bores for jointly closing them under external pressure, the valve plate being displaceably mounted on the housing structure or control plate of the pump for movement away from the bores to thereby relieve internal overpressure.
  • the check-valve plate common to all of the abovementioned bores is held in proper position by guide members which are inserted into the control plate or housing structure of the pump and permit limiting or adjusting the displacement of the valve plate.
  • the portion of the control plate 1 which forms part of the housing structure and contains the bores 3 is completely covered by a valve plate 7.
  • the upper and lower end of the plate 7 are provided with an elongated opening 9 and round opening 9 respectively, the openings are traversed by respective guide members 8 consisted in this embodiment by respective bolts whose threaded portion 8a is screwed into the control plate 1 and which have a shoulder portion 8b passing through the respective openings 9 and 9 of the valve plate 7.
  • the head 30 of each member 8 has a larger diameter than the shoulder portion 8b and forms a stop to limit the displacement of the valve plate 7 away from the control plate 1.
  • the valve plate 7 consists of sheet metal and is relatively thin so as to be flexibly bendable. As a result, the valve plate 7 is placed snugly and tightly against the lateral side of the control disc 1 in the region of the bores 3 when external pressure is applied to the valve plate.
  • the plate 7 may consist of metal, for example stainless steel, or some other material resistant to corrosion.
  • the valve plate 7 is made of a synthetic plastic of virtually no adherence to impurities such as limestone or other incrustation as may become deposited from the water, assuming that the pump is operated with water.
  • a synthetic plastic of virtually no adherence to impurities such as limestone or other incrustation as may become deposited from the water, assuming that the pump is operated with water.
  • Particularly well suitable for the purpose of the invention is the use of polytetrafiuoroethylene as material for the valve plate 7, this material being available under the tradename Teflon in the form of flexible sheets. Aside from its excellent precipitation-preventing properties, this material is chemically stable and has an extremely high resistance to Wear.
  • a liquid-ring pump according to the invention is particularly advantageous because it is much simpler and hence more reliable than the above-mentioned known pumps equipped with ball-type check valves. Besides, the valve plate in a pump according to the invention has a much longer useful life because of the reduced wear in comparison with the ball-shaped valve bodies of the know pumps. 1
  • Another advantage of pumps according to the invention is the possibility of increasing the flow cross section of the valve openings. This is due to the fact that the amount of material which must necessarily remain between adjacent bores can be reduced in comparison with the material required between the individual bores of balltype valve bodies.
  • a rotary vacuum pump of the liquid-ring type comprising a stationary structure forming a housing and having a suction port and a pressure port, a multi-blade rotor rotatable in said housing and forming peripherally sequential cells for entraining gas through said suction port and passing it compressed through said pressure port, said structure having a number of openings through which said chambers communicate with the outside of said structure, said openings being situated close to said pressure port at respective localities ahead of said pressure port relative to the direction of rotor rotation, said peripherally sequential cells, respectively, defining with said structure a compression terminal space adapted to sweep past said openings successively and being variable in volume in accordance with suction pressure applied through said openings a single flexible check-valve plate common to said openings and sealingly engageable with said structure for jointly closing said openings under external pressure, said valve plate being displaceably mounted on said structure for successively closing a varying number of said openings progressively in the direction of rotor rotation by external pressure and for successively opening a varying number of
  • a rotary vacuum pump comprising guide means mounted on said structure and in engagement with said valve plate for securing said valve plate in proper position, said guide means forming a stop for limiting the valve-opening displacement of said valve plate.
  • valve plate being formed of sheet metal consisting of corrosion resistant material.
  • valve plate being formed of stainless steel sheet material.
  • valve plate being formed of synthetic plastic sheet material.
  • valve plate being formed of polytetrafluoroethylene.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Check Valves (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Jet Pumps And Other Pumps (AREA)
US494807A 1965-04-28 1965-10-11 Rotary vacuum pump of the liquid-ring type Expired - Lifetime US3366314A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES0096807 1965-04-28

Publications (1)

Publication Number Publication Date
US3366314A true US3366314A (en) 1968-01-30

Family

ID=7520304

Family Applications (1)

Application Number Title Priority Date Filing Date
US494807A Expired - Lifetime US3366314A (en) 1965-04-28 1965-10-11 Rotary vacuum pump of the liquid-ring type

Country Status (6)

Country Link
US (1) US3366314A (zh)
BE (1) BE679661A (zh)
CH (1) CH444364A (zh)
DE (1) DE1503605B2 (zh)
GB (1) GB1118119A (zh)
NL (1) NL6605135A (zh)

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5110616U (zh) * 1974-07-10 1976-01-26
JPS52129007A (en) * 1976-04-22 1977-10-29 Kubota Ltd Check valve of discharge port for liquid-filied type vacuum pump
US4251190A (en) * 1979-02-08 1981-02-17 General Signal Corporation Water ring rotary air compressor
WO1981000438A1 (en) * 1979-08-09 1981-02-19 Nash Engineering Co Two stage liquid ring pump
US4323334A (en) * 1980-01-25 1982-04-06 The Nash Engineering Company Two stage liquid ring pump
US4392783A (en) * 1980-12-12 1983-07-12 The Nash Engineering Company Liquid ring pump employing discharged pumping liquid for discharge port control
US4498844A (en) * 1983-08-08 1985-02-12 The Nash Engineering Company Liquid ring pump with conical or cylindrical port member
US4521161A (en) * 1983-12-23 1985-06-04 The Nash Engineering Company Noise control for conically ported liquid ring pumps
US4540345A (en) * 1982-06-03 1985-09-10 Ifield Engineering Pty. Limited Precompression valve for hydraulic pumps
US4551070A (en) * 1983-12-23 1985-11-05 The Nash Engineering Company Noise control for conically ported liquid ring pumps
US4551977A (en) * 1982-10-26 1985-11-12 Nissan Motor Co., Ltd. Turbocharged internal combustion engine
US4634348A (en) * 1984-10-01 1987-01-06 Sihi Gmbh & Co. Kg Liquid ring compressor having a passageway in discharge port for introducing air
WO1989012168A1 (en) * 1988-06-08 1989-12-14 Pentamo Oy Liquid ring compressor
US5211543A (en) * 1991-05-17 1993-05-18 Siemens Aktiengesellschaft Liquid-ring pump with pressure chamber valve plate
US5299916A (en) * 1991-12-17 1994-04-05 Siemens Aktiengesellschaft Liquid-ring pump having an outlet means including a noise reducing flexible membrane
US5356268A (en) * 1993-09-29 1994-10-18 The Nash Engineering Company Check valve structures for liquid ring pumps
US20040099521A1 (en) * 2002-11-13 2004-05-27 Deka Products Limited Partnership Liquid ring pumps with hermetically sealed motor rotors
US20050016828A1 (en) * 2002-11-13 2005-01-27 Deka Products Limited Partnership Pressurized vapor cycle liquid distillation
US20050194048A1 (en) * 2002-11-13 2005-09-08 Deka Products Limited Partnership Backpressure regulator
US20050238499A1 (en) * 2002-11-13 2005-10-27 Deka Products Limited Partnership Fluid transfer using devices with rotatable housings
US20060292000A1 (en) * 2003-05-16 2006-12-28 Bernd Wenckebach Liquid ring pump
US20070017192A1 (en) * 2002-11-13 2007-01-25 Deka Products Limited Partnership Pressurized vapor cycle liquid distillation
US20110147194A1 (en) * 2008-08-15 2011-06-23 Deka Products Limited Partnership Water vending apparatus
US8006511B2 (en) 2007-06-07 2011-08-30 Deka Products Limited Partnership Water vapor distillation apparatus, method and system
US8069676B2 (en) 2002-11-13 2011-12-06 Deka Products Limited Partnership Water vapor distillation apparatus, method and system
US8511105B2 (en) 2002-11-13 2013-08-20 Deka Products Limited Partnership Water vending apparatus
US11826681B2 (en) 2006-06-30 2023-11-28 Deka Products Limited Partneship Water vapor distillation apparatus, method and system
US11885760B2 (en) 2012-07-27 2024-01-30 Deka Products Limited Partnership Water vapor distillation apparatus, method and system
US11884555B2 (en) 2007-06-07 2024-01-30 Deka Products Limited Partnership Water vapor distillation apparatus, method and system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3210161C1 (de) * 1982-03-19 1983-10-06 Siemens Ag Fluessigkeitsringkompressor fuer Gase
DE102006009186A1 (de) * 2006-02-24 2007-08-30 Gardner Denver Elmo Technology Gmbh Pumpe

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1180613A (en) * 1913-03-19 1916-04-25 Siemens Schuckertwerke Gmbh Rotary pump.
GB525761A (en) * 1939-02-28 1940-09-04 Milo Ab Improvements in or relating to rotary compressors
US2838072A (en) * 1955-02-07 1958-06-10 Sterer Engineering & Mfg Compa Temperature compensated device for absorbing transient pressure fluctuations
US3102455A (en) * 1959-12-31 1963-09-03 Seeburg Corp Piston structure
US3177781A (en) * 1963-03-20 1965-04-13 Westinghouse Air Brake Co Packing cup
US3185388A (en) * 1963-10-02 1965-05-25 Worthington Corp Refrigeration compressor valve service

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1180613A (en) * 1913-03-19 1916-04-25 Siemens Schuckertwerke Gmbh Rotary pump.
GB525761A (en) * 1939-02-28 1940-09-04 Milo Ab Improvements in or relating to rotary compressors
US2838072A (en) * 1955-02-07 1958-06-10 Sterer Engineering & Mfg Compa Temperature compensated device for absorbing transient pressure fluctuations
US3102455A (en) * 1959-12-31 1963-09-03 Seeburg Corp Piston structure
US3177781A (en) * 1963-03-20 1965-04-13 Westinghouse Air Brake Co Packing cup
US3185388A (en) * 1963-10-02 1965-05-25 Worthington Corp Refrigeration compressor valve service

Cited By (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5110616U (zh) * 1974-07-10 1976-01-26
JPS554554Y2 (zh) * 1974-07-10 1980-02-01
JPS52129007A (en) * 1976-04-22 1977-10-29 Kubota Ltd Check valve of discharge port for liquid-filied type vacuum pump
JPS5727318B2 (zh) * 1976-04-22 1982-06-09
US4251190A (en) * 1979-02-08 1981-02-17 General Signal Corporation Water ring rotary air compressor
WO1981000438A1 (en) * 1979-08-09 1981-02-19 Nash Engineering Co Two stage liquid ring pump
US4323334A (en) * 1980-01-25 1982-04-06 The Nash Engineering Company Two stage liquid ring pump
US4392783A (en) * 1980-12-12 1983-07-12 The Nash Engineering Company Liquid ring pump employing discharged pumping liquid for discharge port control
US4540345A (en) * 1982-06-03 1985-09-10 Ifield Engineering Pty. Limited Precompression valve for hydraulic pumps
US4551977A (en) * 1982-10-26 1985-11-12 Nissan Motor Co., Ltd. Turbocharged internal combustion engine
US4498844A (en) * 1983-08-08 1985-02-12 The Nash Engineering Company Liquid ring pump with conical or cylindrical port member
US4521161A (en) * 1983-12-23 1985-06-04 The Nash Engineering Company Noise control for conically ported liquid ring pumps
US4551070A (en) * 1983-12-23 1985-11-05 The Nash Engineering Company Noise control for conically ported liquid ring pumps
US4634348A (en) * 1984-10-01 1987-01-06 Sihi Gmbh & Co. Kg Liquid ring compressor having a passageway in discharge port for introducing air
WO1989012168A1 (en) * 1988-06-08 1989-12-14 Pentamo Oy Liquid ring compressor
US5122035A (en) * 1988-06-08 1992-06-16 Pentamo Oy Liquid ring compressor
US5211543A (en) * 1991-05-17 1993-05-18 Siemens Aktiengesellschaft Liquid-ring pump with pressure chamber valve plate
AU646562B2 (en) * 1991-05-17 1994-02-24 Siemens Aktiengesellschaft Liquid-ring pump
US5299916A (en) * 1991-12-17 1994-04-05 Siemens Aktiengesellschaft Liquid-ring pump having an outlet means including a noise reducing flexible membrane
US5356268A (en) * 1993-09-29 1994-10-18 The Nash Engineering Company Check valve structures for liquid ring pumps
US20050194048A1 (en) * 2002-11-13 2005-09-08 Deka Products Limited Partnership Backpressure regulator
US8506762B2 (en) 2002-11-13 2013-08-13 Deka Products Limited Partnership Pressurized vapor cycle liquid distillation
US20040099521A1 (en) * 2002-11-13 2004-05-27 Deka Products Limited Partnership Liquid ring pumps with hermetically sealed motor rotors
US20050238499A1 (en) * 2002-11-13 2005-10-27 Deka Products Limited Partnership Fluid transfer using devices with rotatable housings
US9194392B2 (en) 2002-11-13 2015-11-24 Deka Products Limited Partnership Fluid transfer using devices with rotatable housings
US20070017192A1 (en) * 2002-11-13 2007-01-25 Deka Products Limited Partnership Pressurized vapor cycle liquid distillation
US20080105610A1 (en) * 2002-11-13 2008-05-08 Deka Products Limited Partnership Pressurized Vapor Cycle Liquid Distillation
US20080105532A1 (en) * 2002-11-13 2008-05-08 Deka Products Limited Partnership Liquid Pumps with Hermetically Sealed Motor Rotors
US20080105530A1 (en) * 2002-11-13 2008-05-08 Deka Products Limited Partnership Pressurized Vapor Cycle Liquid Distillation
US7465375B2 (en) 2002-11-13 2008-12-16 Deka Products Limited Partnership Liquid ring pumps with hermetically sealed motor rotors
US7488158B2 (en) 2002-11-13 2009-02-10 Deka Products Limited Partnership Fluid transfer using devices with rotatable housings
US20090185918A1 (en) * 2002-11-13 2009-07-23 Deka Products Limited Partnership Fluid Transfer Using Devices with Rotatable Housings
US7597784B2 (en) 2002-11-13 2009-10-06 Deka Products Limited Partnership Pressurized vapor cycle liquid distillation
US8517052B2 (en) 2002-11-13 2013-08-27 Deka Products Limited Partnership Pressurized vapor cycle liquid distillation
US8511105B2 (en) 2002-11-13 2013-08-20 Deka Products Limited Partnership Water vending apparatus
US20050016828A1 (en) * 2002-11-13 2005-01-27 Deka Products Limited Partnership Pressurized vapor cycle liquid distillation
US8069676B2 (en) 2002-11-13 2011-12-06 Deka Products Limited Partnership Water vapor distillation apparatus, method and system
US8282790B2 (en) 2002-11-13 2012-10-09 Deka Products Limited Partnership Liquid pumps with hermetically sealed motor rotors
US7648344B2 (en) * 2003-05-16 2010-01-19 Sterling Fluid Systems (Germany) Gmbh Liquid ring pump
US20060292000A1 (en) * 2003-05-16 2006-12-28 Bernd Wenckebach Liquid ring pump
US11826681B2 (en) 2006-06-30 2023-11-28 Deka Products Limited Partneship Water vapor distillation apparatus, method and system
US8006511B2 (en) 2007-06-07 2011-08-30 Deka Products Limited Partnership Water vapor distillation apparatus, method and system
US11884555B2 (en) 2007-06-07 2024-01-30 Deka Products Limited Partnership Water vapor distillation apparatus, method and system
US8359877B2 (en) 2008-08-15 2013-01-29 Deka Products Limited Partnership Water vending apparatus
US20110147194A1 (en) * 2008-08-15 2011-06-23 Deka Products Limited Partnership Water vending apparatus
US11285399B2 (en) 2008-08-15 2022-03-29 Deka Products Limited Partnership Water vending apparatus
US11885760B2 (en) 2012-07-27 2024-01-30 Deka Products Limited Partnership Water vapor distillation apparatus, method and system

Also Published As

Publication number Publication date
DE1503605A1 (de) 1969-04-30
NL6605135A (zh) 1966-10-31
BE679661A (zh) 1966-10-03
GB1118119A (en) 1968-06-26
DE1503605B2 (de) 1971-05-27
CH444364A (de) 1967-09-30

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