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
  • 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 container for the material in a vacuum line by a pump whose pump power 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 conduit of a ballast water facility, comprising: a
• a reactor device to be supplied with an acrolein derivative, a catalyst acid and water for producing an aqueous acrolein solution, a branch line connected to the
• EP 2 237 373 A1 teaches how an aqueous solution of the biocide acrolein can be produced on deck of acrolein acetal vessels, a highly flammable substance with a low flash point, plus water and catalyst if required, which is conducted via a vacuum line into the engine room of the ship in order to disinfect the ballast water of the ship,
• DE 20 2011 032 903 U1 relates to a mixing and dosing device for mixing and dosing liquid chemicals comprising a circulation pump with a suction nozzle and a
• Discharge pipe a pipe coil whose volume content is such that the metered into the device chemicals have sufficient residence time for the chemical reaction, a pitot tube, which leads the outgoing from the coil loop flow to form a jam point from the outlet of the tube punch to a dosing , which is arranged between the pitot tube and the suction nozzle of the circulation pump and comprises at least two metering valves, and a Downpipe, which is connected to the pitot tube and having a vacuum flange for connection of the mixing and metering device to a vacuum device.
• DE 20 2011 032 903 U1 shows how in a continuous apparatus in the form of a loop mixing reactor
• Acroleinacetal is reacted with the aqueous catalyst solution, and how these two substances are continuously pumped by two Dosierventiie on this device in a vacuum line,
• Dosing pumps are usually driven by three-phase motors, the speed of which is regulated by frequency converters, frequency inverters must be placed relatively close to the three-phase motor, as otherwise there will be control oscillations.
• frequency inverters when using the metering pump in explosive environments, such as. on the deck of vessels carrying liquid gases, the use of electrical equipment is prohibited.
• the invention has for its object to provide a Doster raised for dosing a highly flammable substance, in particular acrolein acetal, ready to steep, which can be used safely in hazardous environments,
• the metering device for metering an easily combustible substance, in particular acrolein acetal, from a source or a container for the substance into a vacuum line by a pump whose pump power is controllable, characterized in that the pump is a driven by a compressed air motor displacement pump, and that between the positive displacement pump and the vacuum line, a pressure holding and control valve is arranged whose dimensionless delivery height H / Ho [mWS / 1 mWS] with the dimensionless flow rate Q / Qo
• the device according to DE 20 201 1 032 903 U1 in explosive environment i. used on deck of vessels carrying liquefied gases.
• Compressed air motor can be of any length, ie the compressed air source and its control can outside the potentially explosive area, for example in the engine room of the ship, be arranged.
• 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. This poses
• the metering device is characterized in that the pressure holding and control valve comprises a cylindrical valve housing having an upper side, in which a central inlet bore is provided with a diameter d1, and with a bottom, in which an inner bore is provided, the Diameter d2 is greater than the diameter of the inlet bore and forms an outlet of the pressure holding and control valve, a Verschierkolben with an upper part whose diameter d3 is smaller than the diameter d2 of the inner bore and larger than the diameter d1 of the inlet bore, a freely movable, circular sealing washer made of an elastomer between the sealing piston and an inner sealing surface, which is located between the inner bore and the inlet bore on an inner side of the
• Valve housing is formed, and by a compression spring which is supported in the inner bore and presses on the sealing piston, the sealing disc against the inner sealing surface.
• the pressure maintenance and control valve is largely insensitive to the presence of
• Control valve 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 control valve according to the invention is particularly advantageous if the pumped medium excreted by polymerization insoluble solids.
• the metering device according to the invention is characterized in that the sealing disc has a diameter d4 which is greater than that
• the metering device according to the invention is characterized » that the top and bottom of the valve housing are formed as a plane sealing surfaces.
• the top and the bottom can be used in an advantageous manner when installing the pressure holding and control valve as sealing surfaces against connection components.
• Fig. 1 shows a section through a pressure holding and control valve, in the inventive
• Dosing device is used
• FIG. 2 shows a section through an installation of the pressure holding and control valve of Figure 1 in a process plant.
• 3 is a schematic representation of a metering device according to the invention for readily 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 pressure holding and control valve according to the invention has a cylindrical, metallic valve housing 1 with a top 2, in which a central inlet bore 3 with a
• Diameter d1 is located.
• the valve housing 1 comprises an inner bore 5, whose diameter d2 is greater than the diameter of the inlet bore 3 and which forms an outlet of the pressure holding and control 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 in relation to connection components during installation of the pressure-retaining and control valve.
• valve housing 1 In the valve housing 1 is located between the inner bore 5 and the inlet bore 3, a cylindrical, flat, inner sealing surface 6 as a transition between the inner bore 5 and the
• a freely movable, circular sealing disc Taus an elastomer is disposed between a Versch96kolben 8 and the sealing surface 6.
• the diameter d3 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 washer 7 has a diameter d3 which is larger than the diameter of the
• the diameter d3 of the sealing disc 7 is smaller than the diameter d4 of the upper part 9 of the Versch47kolbens 8.
• the sealing disc 7 thus closes the inlet bore 3, regardless of the lateral position of the sealing disc 7, when the Verschwinkolben. 8 the sealing disc 7 presses against the sealing surface 6.
• the closing piston 8 has rounded edges 10, a cylindrical lower part 11 of the Verschpsychkolbens 8 has a smaller diameter d4 than the inner diameter of a compression spring 12, which presses the Verschpsychkolben 8 on the sealing disc 7 against the sealing surface 6.
• the compression spring 12 has between the turns free passage column.
• the outer diameter of the compression spring 12 is smaller than the diameter d2 of the inner bore 5.
• the compression spring 12 is biased by one or more clamping rings 13.
• the clamping rings 13 sit with fit h6 in the inner bore 5, which has a fit H7.
• the compression spring 12 exerts a force on the sealing disk 7 by means of the prestressing piston 8, whereby the inlet bore 3 is closed in a liquid-tight manner.
• the clamping force of the compression spring 12 is calculated to the spring constant ma! Compression in mm according to formula I below:
• the hydraulic pressure of the inflowing at the inlet bore 3 liquid causes the sealing disc 7 lifts off from the plane inner sealing surface 8 against the spring force of the compression spring 12 and entering the inlet bore 3 liquid flow past the closure piston 8, through a gap 16 between the upper part the Verschdalekolbens 8 and the inner bore 5 and between the turns of the Druckfederl 2 can flow into the inner bore 5.
• the gap 18 has a cross-sectional area that is different from the cross-sectional area of the
• Inlet hole 3 corresponds.
• the spring 12 and the closing piston 8 are moved.
• the sealing disk 7 remains between the closing piston 8 and the sealing surface 8.
• the compression spring 12, the Verschdalekolben 8 and the sealing disc 7 may be in the
• the pressure holding and regulating valve according to FIG. 1 can, as shown in FIG. 2, be installed between two DIN flanges 17, 17 'using flat gaskets 18, 18 ' . If the
• Flanges 17, 17 'are parts of two shut-off valves can be easily removed during operation by locking both valves above and below the pressure holding and control valve of FIG. 1 and loosening bolts 19, the pressure holding and control valve according to the invention.
• the developed pressure holding and control valve is disassembled by relaxing the Seegerings 14 and another compression spring 12 or an additional clamping ring 13 can be replaced in a short time.
• the metering device comprises a reservoir 20 for a delivery fluid 21, e.g.
• the level of liquid in the reservoir 20 may be low, as shown at 22, or high, as shown at 23.
• a suction line 24 is attached leading to a positive displacement pump 26 as a metering pump.
• the displacement pump 26 is connected via a mechanical clutch 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 control valve 36, the inner bore 5 opens at a flange 17 'of a metering line 39.
• an open shut-off valve 40 the pumped by means of displacement pump 26 medium passes
• Acrolein acetal e.g. in the vacuum pipe 59.
• the displacement pump 26 had a capacity of 27 liters per hour at 128 strokes per minute.
• the vacuum pipe 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 because of 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 [m WS / 1 m WS] denotes the hydrostatic pressure in dimensionless form and Q / Qo [mWIrrrVh] the hydraulic flow capacity in dimensionless form, the following formula applies to the pressure maintenance and control valve according to the invention:
• Compressed air control represents a complete, safe replacement for the electric frequency converter.
• Valve body 1 Material no. 1.2424, outer diameter 27 mm, height
• Closing piston 8 Material no. 1.2424, diameter upper part 17.2
• Sealing washer 7 Viton; Outer diameter 16mm; Height of the plate 2mm
• Spring 12 Material number 1.2330 outer diameter 17.25 mm, wire thickness 1, 25 mm
• Clamping rings 13 Material No. 1.2424, 3 pieces, height 2 mm each
• 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)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=55358870

Family Applications (1)

Country Status (5)

Families Citing this family (1)

Citations (5)

Family Cites Families (12)

• 2015
  • 2015-11-11 DE DE202015106101.3U patent/DE202015106101U1/de not_active Expired - Lifetime
• 2016
  • 2016-11-11 WO PCT/EP2016/077418 patent/WO2017081242A1/de active Application Filing
  • 2016-11-11 CN CN201680078600.7A patent/CN108884818A/zh active Pending
  • 2016-11-11 EP EP16805733.9A patent/EP3374634A1/de not_active Withdrawn
  • 2016-11-11 US US15/774,998 patent/US20180328351A1/en not_active Abandoned

Patent Citations (5)

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