WO2015158764A1 - Dosierdifferenzialwaage zur flüssigkeitsdosierung - Google Patents
Dosierdifferenzialwaage zur flüssigkeitsdosierung Download PDFInfo
- Publication number
- WO2015158764A1 WO2015158764A1 PCT/EP2015/058148 EP2015058148W WO2015158764A1 WO 2015158764 A1 WO2015158764 A1 WO 2015158764A1 EP 2015058148 W EP2015058148 W EP 2015058148W WO 2015158764 A1 WO2015158764 A1 WO 2015158764A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- container
- metering
- dosing
- liquid
- line
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G17/00—Apparatus for or methods of weighing material of special form or property
- G01G17/04—Apparatus for or methods of weighing material of special form or property for weighing fluids, e.g. gases, pastes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
- G01F11/10—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation
- G01F11/12—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements
- G01F11/125—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements of the peristaltic pump type
Definitions
- the invention relates to a metering differential balance for liquid metering with a funnel-shaped container (1) (of any cross-sectional shape) for the liquid to be dispensed, with a metering pump (3), with a line (2) connected to the metering pump (3) for removing the liquid the container (1), with a weighing cell (4) connected to the container (1) for determining the weight of the container (1) and with a control device.
- a metering differential balance for liquid metering with a funnel-shaped container (1) (of any cross-sectional shape) for the liquid to be dispensed, with a metering pump (3), with a line (2) connected to the metering pump (3) for removing the liquid the container (1), with a weighing cell (4) connected to the container (1) for determining the weight of the container (1) and with a control device.
- Dosagedifferenzierwaagen which are also called Differenzialdosierwaagen consist essentially of a reservoir (dosing), a controllable metering, for example, a metering pump, a balance or
- Load cell and a differential metering controller The operating principle can be described as follows.
- the dosing is the good to be dosed, in this case, a liquid which is discharged through the dosing from the container.
- the decrease of the mass from the container is monitored by a cyclic measurement of the mass on the load cell. From the measured
- Mass progression as a function of time is derived by temporal differentiation of the mass flow.
- a control device detects the deviations in the measured actual mass flow from the specified setpoint mass flow and compensates for this by means of a special dosing regulator, the differential dosing regulator, via the motor of the dosing device.
- a refilling element fills the container of the dosing differential balance up to an upper limit value.
- the control is set to a mean speed value before
- the dosing differential scale can be used for very small to large dosing ranges.
- the aim is that the dosage lingers as short as possible in the refill phase. Therefore, the height and weight of large mass flows are very large, because the dosing must take a corresponding amount of product.
- Dosing differential scales are used in many continuous processes, for example in the feeding of extruders.
- Dosierdifferenzialwaagen for liquid metering systems of the type mentioned are used with a metering.
- the lower part of the dosing tank drains into a pipeline, which is initially vertical and then horizontal. From the pipeline, the product is sucked by the metering pump.
- the pipe contains for weighing technology decoupling of the dosing of the stationary pump inlet a flexible transition piece.
- the dosing tank itself is mounted on a load cell and weighed together with the liquid contained.
- the metering pump is supported on the fixed, non-weighed part.
- Dosierdifferenzialwaagen for liquid metering which are also produced by the applicant, inter alia, are suitable for the dosage of liquids with low to high viscosities.
- the metering pumps may vary, for example piston diaphragm pumps, gear pumps, peristaltic pumps,
- Dosing differential balances can be heated, namely with an electric
- Heating with a hot water or thermal oil heating or another heating device.
- the flexible transition in the product-carrying suction line is highly sensitive, must be chemically resistant to the product to be dosed and therefore can not be used for all liquids to be dosed.
- all components When metering flammable / explosive media, all components must be electrically conductive or earthed. This means that the flexible connection (compensator) between the weighing system and the stationary pump requires the use of conductive, chemically resistant and yet flexible materials, which is a disadvantage.
- the gravimetric metering of liquids is carried out by a metering pump, which extracts liquid from a funnel-shaped, in particular conical, weighed container (1) with an intake lance (2).
- a regulation for the inflow of the liquid is provided in the container, which holds the liquid level between a certain lower and a certain upper value of the total volume of the container. More preferably, the lower value is 25% of the total volume and the upper value is 75% of the total volume of the container. Because the temporal mass change
- Liquid level off Due to the funnel shape of the container and the limitation of the working range of the liquid level between 25 and 75% of the total volume of the container, the ratio of these cross-sectional areas is relatively small and only a minor correction has to be made by the controller.
- An advantage of the funnel shape of the container is also that the lid on the top of the funnel in this case offers considerably more space for the filling line, the vent, for temperature sensors and other aggregates than for a cylindrical shape of the container and the same volume.
- a cleaning or inspection opening can be easily accommodated on the upper lid surface of the funnel-shaped container.
- the correction factor is obtained by considering the buoyancy force of the suction pipe (2) in the frusto-conical container (1).
- the buoyancy force FA ( vf ) can be calculated by the following formula, the correction formula:
- J - * * J l + I ⁇ * lii is the cone volume located under the truncated cone
- a T - * (D 2 - (D - 2 * t) 2 )
- the particular advantage of the invention lies in the possibility of a continuous rigid extraction line for the removal of liquid from the container to the metering pump.
- the container end (14) of the conduit (2) is guided in the funnel-shaped container (1) along the central axis thereof so that the end (14) can reach almost to the bottom of the container (1) and after emptying via the suction conduit (2) only small amounts of liquid remain in the container.
- FIG. 2 shows a section through the entire metering differential balance according to FIG. 2, a section through the container of the metering differential balance according to FIG. 2 with fill levels drawn in and the residual product remaining after emptying,
- a metering differential balance in a perspective view according to a second embodiment and a detail of the upper portion of the suction line, in partial section and partially in the side view.
- 1 shows a metering differential balance according to the prior art with a cylindrical container 1, an outlet at the bottom with a vertically downwardly guided line 2, which is continued horizontally on two sides via shut-off devices 16. From the left branch in Figure 1, the line is led to the metering pump 3, which feeds the liquid into the pressure line 9 with injection nozzle 10.
- a flexible connection 17 is provided in the conduit 2. Shown is also the filling opening 7, the filling valve 8 and the vent 18 on the lid 19 of the container first
- the inventive liquid-dosing-differential balance of Figure 2 operates in this embodiment with a piston diaphragm pump and is not heated. It can also be used other pumps, eg. B. gear pumps,
- the liquid-dosing-differential balance consists of a container 1 which is mounted on a weighing cell 4.
- the metering pump 3 is mounted on the frame 6.
- the suction lance 2 protrudes into contactless, which is connected to the suction side of the metering pump 3.
- Above the filling opening 7 is a shut-8, z. B. mounted a ball valve.
- Pressure side a line 9, z. B. a hose or a pipe connected to the process.
- an injection nozzle 10 may be located, for a uniform distribution of
- the pressure is usually around 20 - 60 bar, but may also vary in some applications.
- the weight loss per unit time in the container 1 is detected by the load cell 4 and passed to the control device 24.
- the controller 24 compares the
- the filling of the container 1 with the liquid product through the filling opening 7 can be done manually or automatically. Shown is a ball valve 8, the at
- the dosing differential balance can be heated or cooled.
- the heating / cooling is done electrically or with medium.
- the liquid is continuously metered.
- the weight of the funnel-shaped container is measured with the liquid at certain intervals. From the measured mass differences, divided by the time interval, a mass flow is calculated, from which after possibly further
- Processing measures for the measurement signal such as smoothing, filtering, etc., the actual mass flow is determined. From the comparison of the actual mass flow with the predetermined target mass flow, a signal for controlling a metering regulator for the metering pump is formed. This gravimetric dosing is carried out until the liquid level in the dosing a predetermined lower level, preferably 25% of
- Filling limit is used to ensure safety, so that no overfilling and no contamination of other container parts such as the inside of the lid, the venting neck or the flexible sleeve and other optional attachments during rapid filling of the container.
- Typical times are about 10 to 15 seconds for filling the container and about 10 minutes for gravimetric dosing in normal operation. It should again be noted that even during the filling process, the continuous dosing of
- Liquid is not interrupted.
- the balance is calibrated by applying a calibrated weight. If you fill liquid with exactly the same weight in the container, you get, due to the buoyancy of the suction lance, depending on the level of a different weight signal.
- the gravimetric dosing by suction of the product from a conical container, by means of suction lance, offers the following advantages:
- the height difference between the minimum level 12 and the maximum level 11 of the product is relatively low, since the useful volume for the gravimetric dosing is in the upper part of the funnel-shaped container. As a result, and by the small wall thickness of the suction lance of the error due to the buoyancy of the intake lance is minimized.
- the weighing error is compensated by correction factors in the control.
- a thin-walled tube of small diameter is used so that the buoyancy is as low as possible.
- the suction lance By shortening the suction lance, the residual volume remaining in the tank can be arbitrarily increased and a "sump is created. That's how it can be
- a filter can be used, which sits in the product room. By this arrangement, the product can not dry.
- Suction lances are in the container.
- the position of the pump can be directly above or next to the container. Another advantageous option is described below.
- At the lowermost end 15 of the dosing container 1 (FIG. 4), it is possible to provide a central, tightly closed, in particular screwable, drain opening, which serves for product removal from the container, in particular in two applications. On the one hand, an emergency discharge is created so that the residual product deposited on the bottom can be lowered downwards. On the other serves the
- In-process sampling vent to inspect the product properties of the fluid being dispensed, for example, for quality control.
- the dosage needs to be interrupted only briefly.
- FIG. 6 shows a detail of the upper region of the suction line 2, in partial section and partly in side view.
- a cone-shaped sealing cone 27 is welded.
- the outer surface of the cone-shaped sealing cone 27 is in the operating state at a corresponding inner
- Screw 26 tight.
- the screw connection 26 is connected to the metering pump 3 via a line (not shown in FIG. 6).
- Screw 26 is effected by a union nut 25 whose
- dosing pump dosing pump, dosing device
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Basic Packing Technique (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112015001822.0T DE112015001822A5 (de) | 2014-04-16 | 2015-04-15 | Dosierdiffernzialwaage zur Flüssigkeitsdosierung |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014105423.7A DE102014105423A1 (de) | 2014-04-16 | 2014-04-16 | Dosierdifferenzialwaage zur Flüssigkeitsdosierung |
DE102014105423.7 | 2014-04-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015158764A1 true WO2015158764A1 (de) | 2015-10-22 |
Family
ID=53039385
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2015/058148 WO2015158764A1 (de) | 2014-04-16 | 2015-04-15 | Dosierdifferenzialwaage zur flüssigkeitsdosierung |
Country Status (2)
Country | Link |
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DE (2) | DE102014105423A1 (de) |
WO (1) | WO2015158764A1 (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107024263A (zh) * | 2017-05-29 | 2017-08-08 | 漳州捷龙自动化技术有限公司 | 一种石蜡计量系统 |
CN110411544A (zh) * | 2019-08-07 | 2019-11-05 | 安徽维东建材股份有限公司 | 一种水泥计量器 |
CN111579034A (zh) * | 2020-06-12 | 2020-08-25 | 浙江省计量科学研究院 | 带修正的大量程粉粒料称重装置及方法 |
WO2023052572A1 (de) | 2021-10-01 | 2023-04-06 | Schenck Process Europe Gmbh | Differenzialdosierwaage für flüssigkeiten und verfahren zur dosierung von flüssigkeiten |
DE202021004255U1 (de) | 2021-10-01 | 2023-04-13 | Schenck Process Europe Gmbh | Differenzialdosierwaage für Flüssigkeiten |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1014373C1 (nl) * | 2000-02-14 | 2001-08-15 | Novocontrol Benelux B V | Inrichting voor het uit een vloeistofhouder doseren van een vloeistofstroom, alsmede een werkwijze voor het uit een vloeistofhouder doseren van een vloeistofstroom. |
WO2003045542A1 (en) * | 2001-11-24 | 2003-06-05 | Colormatrix Europe Limited | Method and apparatus for dosing and mixing |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4116331C2 (de) * | 1991-05-17 | 1994-07-07 | Schenck Ag Carl | Dosiervorrichtung für Schüttgüter und Flüssigkeiten |
DE19730034C2 (de) * | 1997-07-14 | 2003-03-27 | Troester Guenther | Verfahren und Vorrichtung zur Bestimmung der zeitlichen Entnahmerate eines fließfähigen Stoffes aus einem Behälter |
-
2014
- 2014-04-16 DE DE102014105423.7A patent/DE102014105423A1/de not_active Withdrawn
-
2015
- 2015-04-15 WO PCT/EP2015/058148 patent/WO2015158764A1/de active Application Filing
- 2015-04-15 DE DE112015001822.0T patent/DE112015001822A5/de active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1014373C1 (nl) * | 2000-02-14 | 2001-08-15 | Novocontrol Benelux B V | Inrichting voor het uit een vloeistofhouder doseren van een vloeistofstroom, alsmede een werkwijze voor het uit een vloeistofhouder doseren van een vloeistofstroom. |
WO2003045542A1 (en) * | 2001-11-24 | 2003-06-05 | Colormatrix Europe Limited | Method and apparatus for dosing and mixing |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107024263A (zh) * | 2017-05-29 | 2017-08-08 | 漳州捷龙自动化技术有限公司 | 一种石蜡计量系统 |
CN107024263B (zh) * | 2017-05-29 | 2023-12-29 | 漳州捷龙自动化技术有限公司 | 一种石蜡计量系统 |
CN110411544A (zh) * | 2019-08-07 | 2019-11-05 | 安徽维东建材股份有限公司 | 一种水泥计量器 |
CN111579034A (zh) * | 2020-06-12 | 2020-08-25 | 浙江省计量科学研究院 | 带修正的大量程粉粒料称重装置及方法 |
WO2023052572A1 (de) | 2021-10-01 | 2023-04-06 | Schenck Process Europe Gmbh | Differenzialdosierwaage für flüssigkeiten und verfahren zur dosierung von flüssigkeiten |
DE102021125502A1 (de) | 2021-10-01 | 2023-04-06 | Schenck Process Europe Gmbh | Differenzialdosierwaage für Flüssigkeiten |
DE202021004255U1 (de) | 2021-10-01 | 2023-04-13 | Schenck Process Europe Gmbh | Differenzialdosierwaage für Flüssigkeiten |
Also Published As
Publication number | Publication date |
---|---|
DE102014105423A1 (de) | 2015-10-22 |
DE112015001822A5 (de) | 2017-01-26 |
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