US20180328351A1 - Metering device - Google Patents

Metering device Download PDF

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Publication number
US20180328351A1
US20180328351A1 US15/774,998 US201615774998A US2018328351A1 US 20180328351 A1 US20180328351 A1 US 20180328351A1 US 201615774998 A US201615774998 A US 201615774998A US 2018328351 A1 US2018328351 A1 US 2018328351A1
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United States
Prior art keywords
diameter
regulating valve
pressure holding
bore
pump
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
US15/774,998
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English (en)
Inventor
Holger Blum
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Individual
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Individual
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Publication of US20180328351A1 publication Critical patent/US20180328351A1/en
Abandoned legal-status Critical Current

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    • 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
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • 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
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/102—Disc valves
    • F04B53/103—Flat-annular type disc valves
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/12—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air

Definitions

  • the invention relates to a metering device for metering a readily combustible substance, in particular acrolein acetal, from a source or a storage container for the substance into a vacuum line by a pump, the pump power of which is controllable.
  • EP 2 237 373 A1 relates to an apparatus for treating ballast water with acrolein to be connected to a main ballast water line of a ballast water facility, comprising: a reactor apparatus to be supplied with an acrolein derivative, catalyst acid and water for producing an aqueous acrolein solution; a branch line connected to the main ballast water line to the branch off a ballast water partial stream, and a mixing device, which is connected to the branch line and to an acrolein solution supply line from the reactor device and designed for dilution of the aqueous acrolein solution from the reactor device, and a supply device for supplying the aqueous acrolein solution from the mixing device to the main ballast water line.
  • EP 2 237 373 A1 teaches how, on deck of a vessel, an aqueous solution of the biocide acrolein can be produced on demand from acrolein acetal a highly flammable material with a low flash point, plus water and catalyst, which aqueous solution is conducted via a vacuum line into the engine room of the ship in order to disinfect there the ballast water of the ship.
  • DE 20 2011 032 903 U1 relates to a mixing and metering device for mixing and metering liquid chemicals
  • a circulation pump with a suction nozzle and a discharge nozzle a conduit coil whose volume content is designed such that the chemicals metered into the device have a sufficient retention time for the chemical reaction
  • a pitot tube which, while forming a surge point, leads the circular stream exiting from the conduit coil from the outlet of the conduit coil to a metering pipe, which is arranged between the pitot tube and the suction port of the circulation pump and comprises at least two metering valves, as well as a downpipe which is connected to the pitot tube and has a vacuum flange for connection of the mixing and metering device to a vacuum device.
  • Metering pumps are usually driven by three-phase motors whose speed is controlled by frequency converters. Frequency converters must be placed relatively close to the three-phase motor, as otherwise there will be control oscillations. In addition, when using the metering pump in potentially explosive environments, such as for example on deck of vessels that transport liquefied gases, the use of electrical operating means is prohibited.
  • the invention has for its object to provide a metering device for metering a highly flammable substance, in particular acrolein acetal, which can be used safely in hazardous environments.
  • the metering device for metering a readily combustible substance, in particular acrolein acetal, from a source or a storage container for the substance into a vacuum line by a pump whose pump power is controllable, is characterized in that the pump is driven by a compressed air motor displacement pump, and that between the positive displacement pump and the vacuum line a pressure holding and regulating valve is arranged whose dimensionless delivery height H/Ho [mWS/1 mWS] is related to the dimensionless delivery rate Q/Qo [m 3 /h/1 m 3 /h] according to the formula:
  • H Hydraulic pressure at the inlet of the pressure holding and regulating valve
  • the device according to DE 20 2011 032 903 U1 can be used in an explosive environment, i.e. on deck of ships carrying liquefied gases.
  • the compressed air line to the compressed air motor can be arbitrarily long, i.e. the compressed air source and its control means can be arranged outside the hazardous area, for example in the engine room of the ship.
  • the torque of compressed air motors is non-linear to the compressed air pressure. In terms of control technology, this represents a disadvantage compared to the frequency converters which can be used in three-phase motors.
  • the metering device is characterized in that the pressure holding and regulating valve comprises a cylindrical valve housing having an upper side, in which a central inlet bore is provided with a diameter d 1 , and with a bottom, in which an inner bore is provided, house diameter d 2 is greater than the diameter of the inlet bore and which forms an outlet of the pressure holding and regulating valve, a closure piston with an upper part whose diameter d 3 is smaller than the diameter d 2 of the inner bore and larger than the diameter d 1 of the inlet bore, a freely movable, circular sealing disc made of an elastomer between the closure piston and an inner sealing surface which is formed between the inner bore and the inlet bore on an inner side of the valve housing, and by a compression spring which is supported in the inner bore and presses through the closure piston the sealing washer against the inner sealing surface.
  • the pressure holding and regulating valve comprises a cylindrical valve housing having an upper side, in which a central inlet bore is provided with a diameter d 1 , and with a bottom, in which
  • the pressure holding and regulating valve is largely insensitive to the presence of suspended matter in the medium flowing through.
  • the pressure maintenance and control valve according to the invention has a self-cleaning effect, because, since all moving parts can move freely axially and laterally, deposits or accumulations of suspended solids are always flushed out with the fluid. Therefore, the use of the pressure holding and regulating valve according to the invention is particularly advantageous if the pumped medium excretes solids insoluble by polymerization.
  • the metering device is characterized in that the sealing disc has a diameter d 4 which is greater than the diameter d 2 of the inlet bore plus the radial extent of the sealing surface, and which is smaller than the diameter d 3 of the upper part of the closure piston.
  • the metering device according to the invention is characterized in that the top and the bottom of the valve housing are formed as a plane sealing surfaces.
  • the top and the bottom can be used in an advantageous manner as sealing surfaces against connection components when installing the pressure holding and regulating valve.
  • FIG. 1 shows a section through a pressure holding and regulating valve which is used in the metering device according to the invention
  • FIG. 2 shows a section through an installation of the pressure holding and regulating valve of FIG. 1 in a process plant
  • FIG. 3 is a schematic representation of a metering device according to the invention for easily combustible substances, in particular acrolein;
  • FIG. 4 is a graph showing the ratio of the compressed air pressure on a compressed air motor of the metering device to the stroke rate of the positive air motor driven by the displacement pump.
  • FIGS. 1 and 2 which is used in the inventive metering device for a vacuum distillation plant.
  • the pressure holding and regulating valve has a cylindrical, metallic valve housing 1 with a top side 2 in which a central inlet bore 3 with a diameter d 1 is located.
  • the valve housing 1 comprises an inner bore 5 , the diameter d 2 of which is greater than the diameter of the inlet bore 3 and which forms an outlet of the pressure holding and regulating valve.
  • the valve housing 1 has an underside 4 , which, like the upper side 2 , is designed as a flat surface and thus can be used as sealing surfaces against connecting components during installation of the pressure holding and regulating valve.
  • valve housing 1 there is located between the inner bore 5 and the inlet bore 3 , a cylindrical, planar, inner sealing surface 6 as a transition between the inner bore 5 and the inlet bore 3 .
  • a freely movable, circular sealing disk 7 made of an elastomer, is arranged between a closure piston 8 and the sealing surface 6 .
  • the diameter d 3 of a cylindrical upper part 9 of the closure piston 8 is smaller than the diameter of the inner bore 5 but larger than the diameter of the inlet bore 3 .
  • the sealing disk 7 has a diameter d 3 which is greater than the diameter of the inlet bore plus the radial extent of the sealing surface 6 .
  • the diameter d 3 of the sealing disk 7 is smaller than the diameter d 4 of the upper part 9 of the closure piston 8 .
  • the sealing disk 7 thus closes the inlet bore 3 independently of the lateral position of the sealing disk 7 when the closure piston 8 presses the sealing disk 7 against the sealing surface 6 .
  • the closure piston 8 has rounded edges 10 .
  • a cylindrical lower part 11 of the closure piston 8 has a smaller diameter d 4 than the inner diameter of a compression spring 12 , which presses the closure piston 8 via the sealing disc 7 against the sealing surface 6 .
  • the compression spring 12 has free passage gaps between the turns.
  • the outer diameter of the compression spring 12 is smaller than the diameter d 2 of the inner bore. 5
  • the compression spring 12 is biased by one or more clamping rings 13 .
  • the clamping rings 13 sit with an h6-fit in the inner bore 5 , which has a H7-fit.
  • a Seeger-Ring 14 which is clamped in a groove 15 , keeps the clamping rings 13 pressed against the compression spring 12 by compression.
  • the compression spring 12 exerts a force on the sealing disk 7 by being pre-stressing by means of the closure piston 8 , whereby the inlet bore 3 is closed in a liquid-tight manner.
  • the compressive force of the compression spring 12 is calculated to the spring constant times compression in mm according to the following formula I:
  • the hydraulic pressure of the liquid inflowing at the inlet bore 3 causes the sealing disc 7 to lift off from the plane inner sealing surface 6 against the spring force of the compression spring 12 and that liquid flow entering the inlet bore 3 can flow past the closure piston 8 , through a gap 16 between the upper part the closure piston 8 and the inner bore 5 and between the turns of the compression spring 12 into the inner bore 5 .
  • the gap 16 has a cross-sectional area which corresponds to the cross-sectional area of the inlet bore 3 .
  • the spring 12 and the closure piston 8 are moving.
  • the sealing disc 7 therein remains between the closure piston 8 and the sealing surface 6 .
  • the compression spring 12 , the closure piston 8 and the sealing disc 7 can move radially in the outlet bore 5 and locate themselves in free play centrically in the inner bore 5 , as experiments show. Therefore, the pressure holding and regulating valve according to the invention can advantageously be used on seagoing vessels, where the ordinate axis performs a tumbling motion by the swell.
  • the pressure holding and regulating valve may be installed between two DIN flanges 17 , 17 ′ using flat gaskets 18 , 18 ′.
  • the pressure-holding and regulating valve according to the invention can be easily removed during operation by locking both valves above and below the pressure holding and regulating valve of FIG. 1 and loosening the bolts 19 .
  • the disconnected pressure holding and regulating valve is disassembled by taking off the Seeger-Ring 14 , and another compression spring 12 or an additional clamping ring 13 can be replaced in a short time.
  • the metering device comprises a storage container 20 for a liquid 21 to be transported, for example acrolein acetal.
  • the level of liquid in the storage container 20 may be low, as shown at 22 , or high as shown at 23 .
  • a suction line 24 is attached, which leads to a positive displacement pump 26 as a metering pump.
  • the displacement pump 26 is connected via a mechanical coupling 27 with a compressed air motor 28 .
  • the compressed air motor 28 is connected to a compressed air line 29 and has an exhaust air pipe 31 .
  • a pressure line 33 leads directly via a flange 17 to the inlet bore 2 of the pressure holding and regulating valve 36 , the inner bore 5 of which opens at a flange 17 of a metering line 39 .
  • an open shut-off valve 40 the medium pumped through the displacement pump 26 , acrolein acetal for example, arrives at the vacuum pipe line 59 .
  • the positive displacement pump 26 had a capacity of 27 liters per hour at 128 strokes per minute.
  • vacuum pipe line 59 there was a vacuum of ⁇ 9.5 mWS (meters of water).
  • the pressure gauge in the pressure line 33 indicated a pressure of 25 mWS.
  • the compressed air pressure in the compressed air line 25 was 77 kPa.
  • the torque of compressed air motors is non-linear to the compressed air pressure due to the inevitable slip at low pressures of less than 2 bar. Additional measures are therefore required to establish the desired linearity between the compressed air pressure and the stroke rate of the positive displacement pump.
  • H/Ho [mWS/1 mWS] denotes the hydrostatic pressure in dimensionless form and Q/Qo [m 3 /h/1 m 3 /h] the hydraulic flow rate in dimensionless form, the following formula applies to the pressure holding and regulating valve of the invention:
  • the compressed air motor 28 of the metering device according to FIG. 3 was subjected to different pressures of compressed air and the associated number of strokes of the displacement pump 26 was measured. The results are shown in the graph in FIG. 4 .
  • the ordinate denotes the strokes per minute of the positive displacement pump 26
  • the abscissa denotes the compressed air pressure on the compressed air motor 28 .
  • the use of the pressure holding and regulating valve 36 of FIG. 1 provides a linear stroke/pressure curve, so that the control of the stroke frequency by means of compressed air control is a fully-fledged, hazard-free replacement for the electric frequency converter.
  • Closure piston 8 Material no. 1.2424, Diameter upper part 17.2 Sealing washer 7 : Viton; Outer diameter 16 mm; Height of plate 2 mm Spring 12 : Material no. 1.2330 Outside diameter 17.25 mm, wire thickness 1.25 mm
  • Clamping rings 13 Material no. 1.2424, 3 pieces, height 2 mm Flanges 17 : Material no. 1.2771, both sides DN 15

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lift Valve (AREA)
  • Reciprocating Pumps (AREA)
US15/774,998 2015-11-11 2016-11-11 Metering device Abandoned US20180328351A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE202015106101.3U DE202015106101U1 (de) 2015-11-11 2015-11-11 Dosiereinrichtung
DE202015106101.3 2015-11-11
PCT/EP2016/077418 WO2017081242A1 (de) 2015-11-11 2016-11-11 Dosiereinrichtung

Publications (1)

Publication Number Publication Date
US20180328351A1 true US20180328351A1 (en) 2018-11-15

Family

ID=55358870

Family Applications (1)

Application Number Title Priority Date Filing Date
US15/774,998 Abandoned US20180328351A1 (en) 2015-11-11 2016-11-11 Metering device

Country Status (5)

Country Link
US (1) US20180328351A1 (de)
EP (1) EP3374634A1 (de)
CN (1) CN108884818A (de)
DE (1) DE202015106101U1 (de)
WO (1) WO2017081242A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2724065C1 (ru) * 2019-11-29 2020-06-19 Акционерное общество "Ярославский завод дизельной аппаратуры" Секция топливного насоса высокого давления

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1800185A (en) * 1928-09-06 1931-04-07 Homer A Thrush Pressure relief valve
US2254209A (en) * 1941-09-02 Valve
US3782412A (en) * 1972-05-11 1974-01-01 Weatherland Co Unbalanced poppet relief valve
US4140148A (en) * 1976-11-18 1979-02-20 The Coca-Cola Company Pressure relief valve for product containers
US4278205A (en) * 1978-04-28 1981-07-14 S K M, Societe Anonyme Constant flow rate fluid supply device, particularly for a spray gun
US4543987A (en) * 1984-04-27 1985-10-01 Eaton Corporation Relief valve
US6068022A (en) * 1999-08-25 2000-05-30 Schrader-Bridgeport International, Inc. Jet pump with improved control valve and pressure relief valve therefore
DE10148960A1 (de) * 2000-10-06 2002-04-11 Luk Fahrzeug Hydraulik Druckbegrenzungsventil
US20150316013A1 (en) * 2012-06-28 2015-11-05 Robert Bosch Gmbh Piston Fuel Pump
US20150375725A1 (en) * 2014-06-27 2015-12-31 Robert Bosch Gmbh Outlet Valve Arrangement of a Pump Element of a Vehicle Brake System
US9328836B2 (en) * 2009-11-12 2016-05-03 Schrader Electronics Ltd. Pressure regulator valve seals, systems and methods

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5161571A (en) * 1990-08-09 1992-11-10 Masako Kiyohara Check valve
DE19743917A1 (de) * 1997-10-02 1999-04-08 Ecotec Ag Fuer Rationelle Tech Betriebsstoffabsaugpumpen Anordnung
EP1996848A4 (de) * 2006-03-02 2012-10-17 Global Valve Technology Ltd Doppeldichtungsventil
US8085209B2 (en) 2009-04-02 2011-12-27 Viasat, Inc. Sub-array polarization control using rotated dual polarized radiating elements
CN104211144B (zh) * 2009-05-29 2016-04-13 H·布卢姆 一种向船的主压舱水线供给水性丙烯醛溶液的供给装置
DE202011050903U1 (de) 2011-08-04 2011-10-11 Holger Blum Misch- und Dosiervorrichtung zum Mischen und Dosieren von Chemikalien

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2254209A (en) * 1941-09-02 Valve
US1800185A (en) * 1928-09-06 1931-04-07 Homer A Thrush Pressure relief valve
US3782412A (en) * 1972-05-11 1974-01-01 Weatherland Co Unbalanced poppet relief valve
US4140148A (en) * 1976-11-18 1979-02-20 The Coca-Cola Company Pressure relief valve for product containers
US4278205A (en) * 1978-04-28 1981-07-14 S K M, Societe Anonyme Constant flow rate fluid supply device, particularly for a spray gun
US4543987A (en) * 1984-04-27 1985-10-01 Eaton Corporation Relief valve
US6068022A (en) * 1999-08-25 2000-05-30 Schrader-Bridgeport International, Inc. Jet pump with improved control valve and pressure relief valve therefore
DE10148960A1 (de) * 2000-10-06 2002-04-11 Luk Fahrzeug Hydraulik Druckbegrenzungsventil
US9328836B2 (en) * 2009-11-12 2016-05-03 Schrader Electronics Ltd. Pressure regulator valve seals, systems and methods
US20150316013A1 (en) * 2012-06-28 2015-11-05 Robert Bosch Gmbh Piston Fuel Pump
US20150375725A1 (en) * 2014-06-27 2015-12-31 Robert Bosch Gmbh Outlet Valve Arrangement of a Pump Element of a Vehicle Brake System

Also Published As

Publication number Publication date
CN108884818A (zh) 2018-11-23
EP3374634A1 (de) 2018-09-19
WO2017081242A1 (de) 2017-05-18
DE202015106101U1 (de) 2016-02-01

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