FR2537219A1 - Regulating throughflow of dosing pumps - Google Patents
Regulating throughflow of dosing pumps Download PDFInfo
- Publication number
- FR2537219A1 FR2537219A1 FR8319104A FR8319104A FR2537219A1 FR 2537219 A1 FR2537219 A1 FR 2537219A1 FR 8319104 A FR8319104 A FR 8319104A FR 8319104 A FR8319104 A FR 8319104A FR 2537219 A1 FR2537219 A1 FR 2537219A1
- Authority
- FR
- France
- Prior art keywords
- stroke
- stroke length
- signals
- regulating
- length
- 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.)
- Pending
Links
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
- 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
- F04B49/12—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 varying the length of stroke of the working members
-
- 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
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
-
- 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
- F04B2201/00—Pump parameters
- F04B2201/02—Piston parameters
- F04B2201/0206—Length of piston stroke
-
- 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
- F04B2201/00—Pump parameters
- F04B2201/02—Piston parameters
- F04B2201/0207—Number of pumping strokes in unit time
-
- 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
- F04B2201/00—Pump parameters
- F04B2201/02—Piston parameters
- F04B2201/0209—Duration of piston stroke
Abstract
Description
L'invention concerne un procédé qui est apte à régler le débit volumétrique de pompes de dosages à pistons oscillants. The invention relates to a method which is capable of regulating the volumetric flow rate of oscillating piston dosing pumps.
On ne connaît pas de procédé de régulation du débit volumétrique des pompes de dosage à vitesse d'entraînement fixe car on a jusqu'ici négligé l'influence des variations de la vitesse d'entraînement provoquees par le réseau et par la charge;
C'est un but de l'invention d'augmenter notablement la précision de dosage des pompes de dosage à vitesse d'entraî- nement fixe et dont la variable réglante est la longueur de course, en fonctionnement continu.There is no known method for regulating the volumetric flow rate of metering pumps with fixed drive speed because the influence of variations in the drive speed caused by the network and by the load has so far been neglected;
It is an object of the invention to significantly increase the metering precision of metering pumps with a fixed drive speed and whose variable is the stroke length, in continuous operation.
L'invention se propose donc de créer un procédé qui élimine toute influence des variations de la vitesse d'entraîne- ment provoquées par le réseau et par la charge sur la pression de dosage. The invention therefore proposes to create a process which eliminates any influence of the variations in the drive speed caused by the network and by the load on the metering pressure.
Ce résultat est obtenu par l'invention grâce au fait que l'on utilise pour déterminer le débit la longueur de course et la durée de course, et que les variations de débit, la vitesse d'entraînement étant fixe, sont compensées en agissant sur la longueur de course. Le traitement du signal s'effectue numériquement. Un autre point remarquable de l'invention consiste dans le fait que les limites du domaine de réglage sont insluses dans le traitement et que les dépassements. nécessaires vers le haut et vers le bas du domaine de réglage sont utilisés comme augmentation d'erreur de réglage. This result is obtained by the invention thanks to the fact that the stroke length and the stroke duration are used to determine the flow, and that the variations in flow, the drive speed being fixed, are compensated for by acting on the stroke length. Signal processing is done digitally. Another remarkable point of the invention consists in the fact that the limits of the adjustment range are included in the processing and that the overshoots. necessary up and down of the adjustment range are used as an increase in adjustment error.
Les caractéristiques et avantages.de l'invention ressortiront d'ailleurs de la description qui va suivre, à titre d' exemple, en référence à la figure unique du dessin annexé qui est le schéma-bloc d'un dispositif de régulation selon le procédé de l'invention. The characteristics and advantages of the invention will become more apparent from the description which follows, by way of example, with reference to the single figure of the appended drawing which is the block diagram of a regulation device according to the method of the invention.
La valeur de durée de course X1 et le signal de longueur de course X2 sont introduits en tant que signaux numriques décimaux codés en binaire dans le dispositif de mesure de débit volumétrique 1. Le signal de nombre de courses X3 sert à activer la commande séquentielle. Le signal de débit calcu- lé Y1 est comparé dans le capparateur numérique 2 avec le signal de nombre bre de courses X3 réglé numériquement au dispositif présélecteur 3. The stroke duration value X1 and the stroke length signal X2 are entered as binary coded decimal digital signals in the volumetric flow measuring device 1. The stroke number signal X3 is used to activate the sequential control. The calculated flow signal Y1 is compared in the digital capparator 2 with the number of strokes X3 signal digitally set at the preselection device 3.
Les signaux de sortie Y21 et Y22 du comparateur numérique 2 sont des signaux de commande pour la longueur de course. Pour la limitation du domaine de réglage, le signal de longueur de course X2 est comparé dans les comparateurs numériques 4 et 6 avec les valeurs limites respectives X5 et X7 réglées aux dispositifs de présélection 5 et 7. Y4 et Y5 sont alors les signaux de commande efficaces pour le dispositif de réglage de la longueur de course. The output signals Y21 and Y22 of digital comparator 2 are control signals for the stroke length. To limit the adjustment range, the stroke length signal X2 is compared in digital comparators 4 and 6 with the respective limit values X5 and X7 set at the preselection devices 5 and 7. Y4 and Y5 are then the control signals effective for the stroke length adjuster.
Le dispositif d'exploitation 8 signale par le signal Y8 une limitation de domaine de réglage provoquée par les valeurs limites.lorsqu'il est encore nécessaire d'effectuer un réglage à la suite d'une variation de débit en tant qu'augmentation d'erreur de dosage. The operating device 8 signals by signal Y8 a limitation of the adjustment range caused by the limit values. When it is still necessary to carry out an adjustment following a flow variation as an increase in dosage error.
Des variations de durée de course provoquées par des modifications de vitesse d'entraînement provenant du secteur ou de la charge alors que la variable reglante longueur de course ne varie pas provoquent-une correction de débit. La comparaisonde la valeur débit avec une valeur nominale réglable provoque, en cas d'écarts dans le débit, par l'intermédiaire de signaux de commande, une variation de la variable réglante longueur de course. De cette façon, les variations de fréquence de course sont compensées par ajustage de la longueur de course. Variations in stroke time caused by changes in drive speed from the sector or load while the variable stroke length does not vary cause a flow correction. The comparison of the flow rate value with an adjustable nominal value causes, in the event of deviations in the flow rate, via control signals, a variation in the variable stroke length adjustment. In this way, variations in stroke frequency are compensated for by adjusting the stroke length.
La pompe de dosage refoule donc ainsi en permanence un débit volumétrique conservant-sa valeur initiale. Le réglage de la longueur de course s'effectue en tenant compte de limitations de domaine de réglage préslectionnables. Lorsque, par suite de variations de vitesse, des signaux de commande commencent à sortir des limites du domaine de réglage, il y a signalisation d'une augmentation d'erreur de dosage. The metering pump thus thus continuously delivers a volumetric flow retaining its initial value. The stroke length is adjusted by taking account of preselectable adjustment range limitations. When, as a result of speed variations, control signals start to go outside the limits of the adjustment range, there is an indication of an increase in dosing error.
Claims (3)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD24557882 | 1982-12-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2537219A1 true FR2537219A1 (en) | 1984-06-08 |
Family
ID=5543014
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8319104A Pending FR2537219A1 (en) | 1982-12-04 | 1983-11-30 | Regulating throughflow of dosing pumps |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE3339096A1 (en) |
FR (1) | FR2537219A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2588319A1 (en) * | 1985-10-04 | 1987-04-10 | Milton Roy Dosapro | PROCESS FOR PRECISELY ESTABLISHING THE FLOW RATE OF A METERING PUMP AND METERING PUMP USING THE SAME |
-
1983
- 1983-10-28 DE DE19833339096 patent/DE3339096A1/en not_active Withdrawn
- 1983-11-30 FR FR8319104A patent/FR2537219A1/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2588319A1 (en) * | 1985-10-04 | 1987-04-10 | Milton Roy Dosapro | PROCESS FOR PRECISELY ESTABLISHING THE FLOW RATE OF A METERING PUMP AND METERING PUMP USING THE SAME |
EP0223643A1 (en) * | 1985-10-04 | 1987-05-27 | DOSAPRO MILTON ROY, SociÀ©té dite: | Process to define exactly the flow rate of a dosing pump, and such a pump |
Also Published As
Publication number | Publication date |
---|---|
DE3339096A1 (en) | 1984-06-07 |
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