WO2020126504A1 - Dispositif et procédé pour le transport plus uniforme d'un liquide - Google Patents

Dispositif et procédé pour le transport plus uniforme d'un liquide Download PDF

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Publication number
WO2020126504A1
WO2020126504A1 PCT/EP2019/083670 EP2019083670W WO2020126504A1 WO 2020126504 A1 WO2020126504 A1 WO 2020126504A1 EP 2019083670 W EP2019083670 W EP 2019083670W WO 2020126504 A1 WO2020126504 A1 WO 2020126504A1
Authority
WO
WIPO (PCT)
Prior art keywords
compressed air
pressure
pneumatic motor
pump
air supply
Prior art date
Application number
PCT/EP2019/083670
Other languages
German (de)
English (en)
Inventor
Christoph Schmid
Original Assignee
Henkel Ag & Co. Kgaa
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 Henkel Ag & Co. Kgaa filed Critical Henkel Ag & Co. Kgaa
Publication of WO2020126504A1 publication Critical patent/WO2020126504A1/fr

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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
    • 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
    • F04B9/123—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 having only one pumping chamber
    • F04B9/125—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 having only one pumping chamber reciprocating movement of the pumping member being obtained by a double-acting elastic-fluid motor
    • 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
    • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • 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
    • F04B53/108—Valves characterised by the material
    • F04B53/1082—Valves characterised by the material magnetic
    • 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
    • F04B53/12—Valves; Arrangement of valves arranged in or on pistons
    • 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
    • F04B9/123—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 having only one pumping chamber
    • F04B9/125—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 having only one pumping chamber reciprocating movement of the pumping member being obtained by a double-acting elastic-fluid motor
    • F04B9/1253—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 having only one pumping chamber reciprocating movement of the pumping member being obtained by a double-acting elastic-fluid motor one side of the double-acting piston fluid motor being always under the influence of the fluid under pressure

Definitions

  • the present invention relates to an apparatus and a method for conveying a liquid more uniformly.
  • Liquids in the sense of the invention are all flowable substances that can be conveyed with the aid of pumps, in particular also highly viscous substances such as liquid adhesives.
  • the pump is often driven by a pneumatic motor. This is connected to an external compressor via suitable pressure lines and is thus supplied with compressed air.
  • the pressure at the outlet of the pump hereinafter also referred to as the delivery pressure of the pump, is directly proportional to the pressure of the compressed air with which the pneumatic motor is applied.
  • a hose line is generally arranged between the outlet of the pump and the inlet of the metering element, the length of which is measured according to the distance to be bridged.
  • a drop in pressure occurs over the length of the hose line, which is more pronounced the longer the hose line is.
  • the pressure at the end of the hose line i.e. at the inlet of the metering device, is usually significantly lower than the delivery pressure of the pump that prevails at the outlet of the pump.
  • liquid adhesive is conveyed from the metering device, for example in the form of an adhesive bead, this can result in an uneven and undesirable thickening of the adhesive bead at the start of a new metering process. This is perceived as disadvantageous and is in need of improvement.
  • the object of the invention is therefore to provide a device and a method for the more uniform delivery of a liquid, whereby the disadvantages of the prior art are overcome.
  • This object is achieved by a device with the features of patent claim 1 and by a method with the features of patent claim 11.
  • the invention is a device for
  • More even delivery of a liquid from a reservoir comprising a pump, a pneumatic motor operated by compressed air, which is designed to drive the pump, a compressed air supply for providing the compressed air, and a metering element arranged downstream of the pump.
  • the invention is characterized in that the device has a unit for reducing the pressure upstream of the input of the pneumatic motor, comprising a directional valve and a pressure regulator, the input of the pneumatic motor being connected to the compressed air supply in a first switching position of the directional valve and in a second switching position of the Directional control valve, the input of the pneumatic motor is separated from the compressed air supply and connected to the pressure regulator, and the pressure regulator is designed to regulate the pressure in the pneumatic motor to a value that is reduced compared to the pressure of the compressed air provided by the compressed air supply.
  • the invention provides a unit for lowering the pressure, by means of which the pressure in the pneumatic motor can be reduced by targeted venting with the aid of the pressure regulator during the downtimes of the device. Due to the proportionality between the pressure in the pneumatic motor and the delivery pressure of the pump, the delivery pressure of the pump, which prevails at the outlet of the pump, is also reduced during the downtime of the device by using the unit for reducing the pressure according to the invention.
  • the pressure controller can be set so that the pressure at the outlet of the pump essentially corresponds to the pressure at the inlet of the metering device during downtimes, so that a pressure drop between the outlet of the pump and the inlet of the metering device and thus the pump running on during the Downtime of the device can be avoided.
  • the pressure at the inlet of the metering element can be kept at the same value during the downtime of the device as during a conveying process.
  • this leads to a more uniform delivery of the conveyed material, since this is always discharged from the metering element under the same pressure.
  • a directional valve within the unit for reducing the pressure makes it possible to simply switch between the compressed air supply and the pressure regulator when changing from a conveying process to a standstill of the device and vice versa.
  • the directional control valve is in a first switching position, so that the compressed air supply is connected to the input of the pneumatic motor via the directional control valve and the pneumatic motor is pressurized with compressed air. If the delivery is to be stopped or interrupted, the directional control valve is transferred from the first to a second switching position, whereby the input of the pneumatic motor is disconnected from the compressed air supply and connected to the pressure regulator, which is designed to reduce the pressure in the pneumatic motor during the Bring downtimes of the device.
  • the metering element is closed or opened.
  • the opening and closing of the metering element and the switching of the directional valve take place in a synchronized manner.
  • the pressure regulator is designed to regulate the pressure in the pneumatic motor to a value that is reduced compared to the pressure of the compressed air provided by the compressed air supply. This lowering of the pressure in the pneumatic motor while the device is at a standstill prevents the pump from running on and the pressure drop between the outlet of the pump and the inlet of the metering element can be kept constant.
  • the directional valve is designed as a 3/2-way pneumatic valve.
  • the 3/2-way pneumatic valve has two inputs on one input side, one of which is connected to the compressed air supply and the other to the pressure regulator.
  • On an output side the 3/2-way pneumatic valve has an output which is connected to the input of the pneumatic motor.
  • the 3/2-way pneumatic valve clears the way from the compressed air supply to the input of the pneumatic motor, while in a second switch position the compressed air supply from the input of the
  • the 3/2-way pneumatic valve can be controlled via a solenoid valve.
  • the unit for reducing the pressure can comprise a manometer, which is between the
  • Directional valve and the pressure regulator is arranged and serves to monitor the pressure set by the pressure regulator in the pneumatic motor.
  • the pressure regulator is designed to control the pressure in the
  • Pneumatic motor to regulate to a value in the range of 3/4 to 1/4, preferably half of the pressure of the compressed air provided by the compressed air supply.
  • the pressure difference between the outlet of the pump and the inlet of the metering element is more pronounced the longer the distance, for example one, between pump and metering element
  • Hose line and the more viscous the product being pumped.
  • the compressed air means that the pressure drop within the hose line remains constant.
  • the pressure regulator For very large hose line lengths from around 4 m it may be necessary to set the pressure regulator so that the pressure in the
  • Pneumatic motor is lowered even further.
  • the pressure could also be reduced to zero bar in the idle state.
  • significantly more air would be required to start the engine and the pump would start up with a delay. If the procedure is only to lower the necessary pressure, a noticeable, delayed start of the pump can be avoided.
  • a pneumatically operated scoop piston pump can be used as the pump.
  • the metering device of the device can be designed as a metering valve. This can be, for example, a single-acting 2/2-way metering valve with spring return. Alternatively, the metering valve can also be used as a double-acting 2/2-way metering valve
  • the metering element is designed as a metering pump.
  • the metering device designed as a metering valve can be operated pneumatically by means of control air.
  • the control of the metering valve can be done in a control unit
  • the invention proposes that the metering element and the directional control valve of the pressure reduction unit can be controlled synchronously via a common control.
  • a common control can include, for example, a solenoid valve arranged in a control unit.
  • a 3/2-way solenoid valve can be used in the control unit, while a double-acting 2/2-way metering valve without spring return can be used together with a 5/2-way solenoid valve can be used in the control unit.
  • the compressed air supply provides compressed air at a pressure between 0.5 and 6 bar, preferably between 1 and 5 bar.
  • the invention also relates to a method for more evenly conveying a liquid from a reservoir using a device according to one of claims 1 to 10, comprising the following steps in alternating order:
  • Compressed air supply is disconnected and connected to the pressure regulator, as well as closing the dosing device.
  • the dosing member can be designed as a dosing member operated pneumatically by means of control air.
  • the metering valve can be controlled via a solenoid valve arranged in a control unit.
  • the control air of the metering element can also cause the directional control valve to switch over. In this way, a separate control of the directional control valve is not necessary and a synchronous control of the metering element and directional control valve can be ensured.
  • the dosing member of the method according to the invention can provide that the pressure regulator regulates the pressure in the pneumatic motor to a value in the range from 3/4 to 1/4, preferably half of the pressure of the compressed air provided by the compressed air supply.
  • Figure 1 A schematic representation of the structure of a device according to the invention for more uniform delivery of a liquid.
  • FIG. 1 shows a device, designated overall by 1, for more evenly conveying a liquid, not shown here, from a reservoir 2.
  • the liquid can be, for example, an adhesive which is conveyed and metered out from a 20 liter bucket or from a 200 liter barrel .
  • the device 1 comprises a pump 3 designed as a scoop piston pump, a pneumatic motor 4 operated by compressed air, which is designed to drive the pump 3, a compressed air supply 5 for providing the compressed air and a metering element 6 arranged downstream of the pump 3.
  • the input 4a of the pneumatic motor 4 is preceded by a unit for lowering the pressure 7, which comprises a 3/2-way pneumatic valve 8 with spring return and a pressure regulator 9.
  • the output of the 3/2-way pneumatic valve 8 is connected via a line 18 to the input 4a of the pneumatic motor.
  • the pressure regulator 9 is connected via a line 19 to an input of the 3/2-way pneumatic valve.
  • the compressed air supply 5 is connected via the line 15 to a further input of the 3/2-way pneumatic valve 8.
  • the 3/2-way pneumatic valve 8 can be transferred from a first switching position to a second switching position and vice versa.
  • the line 15 is connected to the line 18 and thus the way for the compressed air via the
  • Pneumatic motor 4 is pressurized with compressed air in this switching position.
  • the pressure regulator 9 is designed to regulate the pressure in the pneumatic motor 4 to a value which is reduced compared to the pressure of the compressed air provided by the compressed air supply 5.
  • the unit for reducing the pressure 7 further comprises a manometer 11 which is arranged between the 3/2-way pneumatic valve 8 and the pressure regulator 9.
  • the pump 3 is operated by the pneumatic motor 4 and pumps during one
  • the dosing member 6 is designed as a single-acting 2/2-way dosing valve with spring return, which is between an open position, in which liquid from the
  • Dosing member 6 can be dosed, and a closed position in which no liquid can be dosed from the dosing member 6 can be switched.
  • the metering element 6 is controlled via a 3/2-way solenoid valve 10, which is installed in a control unit (not shown here).
  • the 3/2-way solenoid valve 10 also controls the 3/2-way pneumatic valve 8.
  • the 3/2-way pneumatic valve is switched in parallel and in synchronism with the changeover in the 2/2-way metering valve the same control air.
  • the control air is supplied by the compressed air supply 5.
  • the pressure of the compressed air provided by the compressed air supply 5 is approximately five bar.
  • Method step transfers the 3/2-way pneumatic valve 8 into the first switching position, so that the input 4a of the pneumatic motor 4 via lines 15 and 18 to the compressed air supply 5 is connected and the pneumatic motor 4 is acted upon by the compressed air.
  • the dosing member 6 is opened.
  • the pneumatic motor 4 acted upon by the compressed air drives the pump 3, which conveys the liquid from the reservoir 2 via the hose line 12 to the metering element 6, via which the liquid is released to the outside.
  • the 3/2-way pneumatic valve 8 is transferred from the first to the second switching position in a second method step, so that the input 4a of the pneumatic motor 4 is separated from the compressed air supply 5 and connected to the
  • Pressure regulator 9 is connected. At the same time, the dosing member 6 is closed.
  • the pressure regulator 9 is set such that it regulates the pressure in the pneumatic motor 4 to half the pressure of the compressed air provided by the pressure supply 5. The consequence of this is that during the downtime of the device 1, the delivery pressure of the pump 3, which prevails at the outlet 3a of the pump 3, is lower than the pressure prevailing there during a delivery process.
  • the pressure regulator 9 can be set as a function of the length of the hose line 12 so that the pressure prevailing at the outlet 3a of the pump 3 during the downtime of the device 1 is equal to the pressure at the inlet of the metering element 6. This ensures that the pressure drop within the hose line 12 remains constant during the downtime of the device 1.
  • the 3/2-way pneumatic valve 8 is again transferred from the second into the first switching position, so that the input 4a of the pneumatic motor 4 is connected again to the compressed air supply 5 and the pneumatic motor 4 is again charged with the full compressed air becomes.
  • the dosing member 6 is opened again. The liquid now emerges from the metering element 6 at constant pressure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Abstract

L'invention concerne un dispositif (1) pour le transport plus uniforme d'un liquide à partir d'un réservoir (2), comprenant une pompe (3), un moteur pneumatique (4) actionné au moyen d'air comprimé, lequel est conçu pour entraîner la pompe (3), une alimentation en air comprimé (5) pour la fourniture de l'air comprimé ainsi qu'un organe de dosage (6) disposé en aval de la pompe (3), le dispositif (1) présentant une unité pour la réduction de pression (7) montée en amont de l'entrée du moteur pneumatique (4), comprenant un distributeur à voies (8) ainsi qu'un régulateur de pression (9), dans une première position de commutation du distributeur à voies (8) l'entrée du moteur pneumatique (4) étant connectée à l'alimentation en air comprimé (5) et dans une deuxième position de commutation du distributeur à voies (8) l'entrée du moteur pneumatique (4) étant séparée de l'alimentation en air comprimé (5) et connectée au régulateur de pression (9), et le régulateur de pression (9) étant conçu pour régler la pression dans le moteur pneumatique (4) à une valeur réduite par rapport à la pression de l'air comprimé fourni par l'alimentation en air comprimé (5). L'invention concerne en outre aussi un procédé pour le transport plus uniforme d'un liquide à partir d'un réservoir (2) en utilisant un tel dispositif (1).
PCT/EP2019/083670 2018-12-20 2019-12-04 Dispositif et procédé pour le transport plus uniforme d'un liquide WO2020126504A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018222557.5 2018-12-20
DE102018222557.5A DE102018222557A1 (de) 2018-12-20 2018-12-20 Vorrichtung und Verfahren zum gleichmäßigeren Fördern einer Flüssigkeit

Publications (1)

Publication Number Publication Date
WO2020126504A1 true WO2020126504A1 (fr) 2020-06-25

Family

ID=68841072

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/083670 WO2020126504A1 (fr) 2018-12-20 2019-12-04 Dispositif et procédé pour le transport plus uniforme d'un liquide

Country Status (2)

Country Link
DE (1) DE102018222557A1 (fr)
WO (1) WO2020126504A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028014A (en) * 1975-06-18 1977-06-07 Cocks Eric H Reversing means for double-acting fluid pump
FR2505941A1 (fr) * 1981-05-12 1982-11-19 Mo Aviat I Installation de pompage pneumohydraulique
US4765509A (en) * 1986-10-02 1988-08-23 Adhesive Engineering Company Pumping system
EP0451942A1 (fr) * 1990-04-11 1991-10-16 Pmc, Inc. Pompe à déplacement positif à double effet
US6790010B2 (en) * 2001-12-28 2004-09-14 Nanya Technology Corporation Switching system for a reciprocating piston pump
US6827323B2 (en) * 2000-09-25 2004-12-07 J.F.T. Co., Ltd. Mold cooling device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4025114A1 (de) * 1990-08-08 1992-02-13 Prominent Dosiertechnik Gmbh Membran-dosierpumpe
DE20014354U1 (de) * 2000-08-19 2000-12-14 Festo AG & Co, 73734 Esslingen Steuervorrichtung einer Förderpumpe
US8887966B2 (en) * 2010-01-12 2014-11-18 Graco Minnesota Inc. Elevator control for inductor pump
DE102017216713B4 (de) * 2017-09-21 2020-07-30 Festo Se & Co. Kg Verfahren und Dosiervorrichtung zur dosierten Fluidausgabe

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028014A (en) * 1975-06-18 1977-06-07 Cocks Eric H Reversing means for double-acting fluid pump
FR2505941A1 (fr) * 1981-05-12 1982-11-19 Mo Aviat I Installation de pompage pneumohydraulique
US4765509A (en) * 1986-10-02 1988-08-23 Adhesive Engineering Company Pumping system
EP0451942A1 (fr) * 1990-04-11 1991-10-16 Pmc, Inc. Pompe à déplacement positif à double effet
US6827323B2 (en) * 2000-09-25 2004-12-07 J.F.T. Co., Ltd. Mold cooling device
US6790010B2 (en) * 2001-12-28 2004-09-14 Nanya Technology Corporation Switching system for a reciprocating piston pump

Also Published As

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