EP3308019B1 - Pompe à piston alternatif à limitation de débit côté entrée - Google Patents

Pompe à piston alternatif à limitation de débit côté entrée Download PDF

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Publication number
EP3308019B1
EP3308019B1 EP16739020.2A EP16739020A EP3308019B1 EP 3308019 B1 EP3308019 B1 EP 3308019B1 EP 16739020 A EP16739020 A EP 16739020A EP 3308019 B1 EP3308019 B1 EP 3308019B1
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EP
European Patent Office
Prior art keywords
throttle
piston
reciprocating pump
displacement chamber
filter
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.)
Active
Application number
EP16739020.2A
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German (de)
English (en)
Other versions
EP3308019A1 (fr
Inventor
Olaf OHLIGSCHLÄGER
Thomas Rolland
Jeannette Kemper
Axel MÜLLER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thomas Magnete GmbH
Original Assignee
Thomas Magnete GmbH
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Publication date
Application filed by Thomas Magnete GmbH filed Critical Thomas Magnete GmbH
Publication of EP3308019A1 publication Critical patent/EP3308019A1/fr
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Publication of EP3308019B1 publication Critical patent/EP3308019B1/fr
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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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • 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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0452—Distribution members, e.g. valves

Definitions

  • the invention relates to a reciprocating pump according to the preamble of claim 1.
  • the invention further relates to a method for operating a reciprocating pump according to the preamble of claim 12.
  • DE 10 2014 000 627 B3 shows a reciprocating pump, comprising a movable by an electromagnet against a return spring piston which separates a first displacement chamber and a second displacement chamber, wherein the two displacement chambers are interconnected by a spill valve means.
  • An exhaust valve connects the second displacer with an outlet, while the first displacer is connected to an inlet through a throttle.
  • the throttle can be closed by a seal connected to the piston when the piston is under the load of the return spring in its inlet-side end position.
  • Reciprocating pumps with electromagnetic drive are known, for example DE 43 28 621 A1 and DE 10 2008 055 609 B4 , If such a reciprocating pump to be used to receive fluid from a pressurized housing needs, an input-side flow restriction is required so that the pressure in the housing does not affect the function of the reciprocating pump.
  • a cost-effective reciprocating pump should have an input-side pressure reduction and / or flow limitation and should work reliably even with liquids of different composition with pollution by small particles.
  • the reciprocating pump is an electromagnetically driven pump with two displacement chambers, which is flowed through by the liquid to be delivered.
  • the flow rate of the reciprocating pump is limited according to this invention by a throttle or orifice.
  • a pressure may be present, which is higher than the maximum value of the pressure in the input-side first displacement chamber for trouble-free operation of the reciprocating pump.
  • the said throttle is also used to lower the pressure in the first displacement chamber to a permissible level, when the theoretical flow rate of the pump, which is equal to the product of the stroke volume of the single stroke and the frequency, is greater than the inflow through the throttle , In this working state of the pump, the real flow rate is also smaller than said product, the reciprocating pump gets even further in the state of a cavitation induced flow reduction, because not enough liquid flows in the suction in the second displacement. The cavitation does not cause any damage in this case because the pressure is low.
  • the throttle ultimately determines the flow rate of the reciprocating pump.
  • the throttle In the case of the pump stall, the throttle is closed by a spring, which also returns the piston of the pump to its rest position, presses a seal by means of the piston against the throttle.
  • the throttle In order to achieve the described effect, the throttle must have a very small effective diameter at a high pressure in said housing. Chokes with a very small effective diameter (eg less than 0.5 mm) tend to block because every technical fluid contains particles that have not been filtered out by an upstream filter.
  • the shock wave is caused on the one hand by the striking and on the other hand by an invagination of the seal in the throttle.
  • a throttle is used with a movable insert, which is displaced against a spring with each impact of the piston and its movement prevents the blockage.
  • a pressure relief valve in the piston of the reciprocating pump is optionally provided, which limits the pressure difference between the first and the second displacement to a value that is only so high that the function of the reciprocating pump always secured remains.
  • the reciprocating pump is operated at the start of its operation with a higher than usual voltage.
  • the reciprocating pump (1) accordingly Fig. 1 is driven by an electromagnet (2) acting against a return spring (11).
  • the reciprocating pump includes two displacement chambers (3, 4), which are separated by a piston (5) moved by the electromagnet, and an overflow valve device (6) for connecting the two displacement chambers with each other and an outlet valve (7).
  • the first displacement chamber (3) is connected to an inlet (9) through a throttle (8), the throttle (8) being closed by a seal (24) connected to the piston (5) when the piston (5) moves located in its inlet-side end position.
  • the force of the return spring (11) is greater than the pressure force resulting from the pressure at the inlet (9) and the Effective area (25) of this pressure between the throttle (8) and the seal (24) results when the seal (24) rests on the throttle (8).
  • the stroke of the piston (5) is designed so that the piston (5) by means of the seal (24) alsani on the throttle (8) when in the non-driven state of the electromagnet (2) the return spring (11) the piston (5) brings to its rest position.
  • the effective inner diameter D of the throttle (8) is designed so that in one of the electromagnet (2) caused working stroke of the piston (5) from the second displacement chamber (4) to the outlet geometrie employment displaceable liquid volume is greater than that at the same time because of the pressure difference between the inlet (9) and the first displacement chamber (3) through the throttle (8) during the working cycle of the piston (5) in the first displacement chamber (3) inflow volume.
  • the flow rate of the reciprocating pump from the throttle (8) and not by the displacement effect of the piston (5) is limited, and in the first displacement chamber (3) sets a pressure that is considerably lower than the pressure at the inlet, for example, less than 1 bar.
  • the throttle (8) has, for example, an effective inner diameter D which is greater than or equal to 0.1 mm and less than or equal to 1 mm.
  • the length of the throttle bore (12) is preferably less than or equal to 50 * D and greater than or equal to 5 * D, so that predominantly laminar flow is achieved in the throttle.
  • a shutter which has a bore length shorter than D.
  • a filter (10) with a nominal filter fineness of less than D / 4 upstream of the throttle (8) is provided.
  • the filter (10) in a housing part (13) of the reciprocating pump is arranged so that the pumped liquid on the way from the inlet (9) to the throttle (8) must pass completely through the filter.
  • the filter (10) outside the housing part (13) of the reciprocating pump in a filter housing (14) is arranged, being ensured by the connection of the housing of the reciprocating pump with the filter housing (14) that only such liquid to the throttle (8) that has previously passed the filter (10).
  • the throttle (8) is corresponding Fig. 2 designed as a screw-threaded body with a first thread, wherein the body is screwed into a second thread, which is mounted in the housing part (13). Alternatively, said body is pressed into the housing part.
  • the throttle (8) consists of at least two components, a sleeve (20) and an insert (21), wherein the insert (21) in the sleeve (20) is movable.
  • a flow path (23) is arranged between the insert (21) and the sleeve (20).
  • the insert (21) is held by its own weight or a spring (22) in its rest position and pressed by the piston (5) in a working position when in the idle state of the electromagnet (2), the return spring (11) the piston in its rest position brings.
  • the piston (5) contains a pressure limiting valve (not shown) which, when a limiting pressure difference between the first displacer space (3) and the second displacer space (4), exceeds a volume flow between the first displacer space (3) and the second displacer space (FIG. 4) releases.
  • the reciprocating pump is corresponding Fig. 3 arranged in a vertical or nearly vertical position below the filter housing (14).

Claims (14)

  1. Pompe à piston (1) dotée d'un entraînement par électro-aimant (2) qui agit à l'encontre d'un ressort de rappel (11), dotée d'une première chambre de refoulement (3) et d'une seconde chambre de refoulement (4) qui sont séparées par un piston (5) déplacé par l'électro-aimant (2), dotée d'un dispositif à soupape de décharge (6) pour assurer la liaison des deux chambres de refoulement (3, 4), et dotée d'une soupape de sortie (7) pour assurer la liaison de la seconde chambre de refoulement (4) avec une sortie, la première chambre de refoulement (3) étant reliée avec une entrée (9) par un étranglement (8), l'étranglement (8) étant fermé par un joint (24) relié avec le piston (5) lorsque le piston (5) se trouve dans sa position finale du côté de l'entrée,
    caractérisée en ce
    qu'un diamètre intérieur D efficace de l'étranglement (8) est calculé de telle manière qu'un volume de liquide pouvant être refoulé à partir de la seconde chambre de refoulement (4) par une levée du piston (5) provoquée par l'électro-aimant (2) qui est conditionné géométriquement pour la sortie par le piston (5) est supérieur au volume de liquide s'écoulant après coup par l'étranglement (8) dans la première chambre de refoulement (3) pendant le travail du piston (5) en raison d'une différence de pression entre l'entrée (9) et la première chambre de refoulement (3).
  2. Pompe à piston selon la revendication 1, caractérisée en ce que la force du ressort de rappel (11) est supérieure à une force de pression qui résulte d'une pression à l'entrée (9) et une surface d'action (25) de cette pression entre l'étranglement (8) et le joint (24) lorsque le joint (24) repose sur l'étranglement (8).
  3. Pompe à piston selon l'une des revendications 1 à 2, caractérisée en ce que la longueur d'un alésage d'étranglement (12) de l'étranglement (8) est inférieure ou égale à 50*D et supérieure ou égale à 5*D.
  4. Pompe à piston selon l'une des revendications 1 à 3, caractérisée en ce qu'un filtre (10) avec une finesse de filtration nominale inférieure à D/4 est agencé avant l'étranglement (8).
  5. Pompe à piston selon la revendication 4, caractérisée en ce que le filtre (10) est disposé dans une partie de boîtier (13) de la pompe à piston de telle manière que le liquide transporté doit traverser totalement le filtre (10) sur le trajet de l'entrée (9) jusqu'à l'étranglement (8).
  6. Pompe à piston selon la revendication 4, caractérisée en ce que le filtre (10) est disposé à l'extérieur de la partie de boîtier (13) de la pompe à piston dans un boîtier de filtre (14), où on s'assure, par la connexion du boîtier de la pompe à piston avec le boitier de filtre (14), qu'uniquement du liquide qui a traversé auparavant le filtre (10) arrive jusqu'à l'étranglement (8).
  7. Pompe à piston selon la revendication 6, caractérisée en ce que la pompe à piston est disposée dans une position verticale, ou pratiquement verticale, en dessous du boîtier de filtre (14).
  8. Pompe à piston selon l'une des revendications 1 à 7, caractérisée en ce que l'étranglement (8) est solidement relié avec la partie de boîtier (13) soit par des filetages internes et externes, soit par un joint serti.
  9. Pompe à piston selon l'une des revendications 1 à 8, caractérisée en ce que l'étranglement (8) est constitué d'au moins deux composants, d'une enveloppe (20) et d'une pièce d'insertion (21), la pièce d'insertion (21) étant mobile dans l'enveloppe (20) et un trajet d'écoulement (23) étant agencé entre la pièce d'insertion (21) et l'enveloppe (20), et la pièce d'insertion (21) est maintenue dans sa position de repos du fait de son propre poids et/ou par un ressort (22) et est poussée dans une position de travail par le piston (5) lorsque le ressort de rappel (11) met le piston (5) dans sa position de repos à l'état de repos sans entraînement de l'électro-aimant (2).
  10. Pompe à piston selon l'une des revendications 1 à 9, caractérisée en ce que le piston (5) contient une soupape de limitation de pression qui libère un flux volumique entre la première chambre de refoulement (3) et la seconde chambre de refoulement (4) lors d'un dépassement d'une différence de pression limite entre la première chambre de refoulement (3) et la seconde chambre de refoulement (4).
  11. Pompe à piston selon l'une des revendications 1 à 10, caractérisée en ce que le diamètre intérieur D efficace de l'étranglement (8) est supérieur ou égal à 0,1 mm et est inférieur ou égal à 1 mm.
  12. Procédé de fonctionnement d'une pompe à piston, dotée d'un entraînement par électro-aimant (2) qui agit à l'encontre d'un ressort de rappel (11), dotée d'une première chambre de refoulement (3) et d'une seconde chambre de refoulement (4) qui sont séparées par un piston (5) déplacé par l'électro-aimant (2), dotée d'un dispositif à soupape de décharge (6) pour assurer la liaison des deux chambres de refoulement (3, 4), et dotée d'une soupape de sortie (7) pour assurer la liaison de la seconde chambre de refoulement (4) avec une sortie, dans lequel, à l'état de repos de la pompe à piston (1), le piston (5) ferme un étranglement (8) entre l'entrée (9) et la première chambre de refoulement (3) avec la force d'un ressort de rappel (11),
    caractérisé en ce
    que la pression dans la première chambre de refoulement (3) est maintenue considérablement inférieure à la pression dans l'entrée (9), et qu'un volume de liquide pouvant être refoulé par une levée du piston (5) qui est conditionné géométriquement par le piston (5) est supérieur au volume de liquide arrivant par l'étranglement (8) pendant le travail du piston (5).
  13. Procédé selon la revendication 12, caractérisé en ce que d'une part, le liquide transporté traverse un filtre (10) disposé avant l'étranglement (3) et d'autre part, le piston (5) tape régulièrement contre l'étranglement (8) et empêche ainsi un dépôt de particules.
  14. Procédé selon la revendication 12, caractérisé en ce qu'un dépôt de particules dans ou avant l'étranglement (8) est empêché du fait que le piston (5) enfonce régulièrement une pièce d'insertion (21) dans l'étranglement (8) lorsque le ressort de rappel (11) ramène le piston dans sa position de repos à l'état de repos sans entraînement de l'électro-aimant (2).
EP16739020.2A 2015-06-09 2016-06-06 Pompe à piston alternatif à limitation de débit côté entrée Active EP3308019B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015007464.4A DE102015007464A1 (de) 2015-06-09 2015-06-09 Hubkolbenpumpe mit eingangsseitiger Förderstrombegrenzung
PCT/EP2016/000932 WO2016198156A1 (fr) 2015-06-09 2016-06-06 Pompe à piston alternatif à limitation de débit côté entrée

Publications (2)

Publication Number Publication Date
EP3308019A1 EP3308019A1 (fr) 2018-04-18
EP3308019B1 true EP3308019B1 (fr) 2019-01-23

Family

ID=56413610

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16739020.2A Active EP3308019B1 (fr) 2015-06-09 2016-06-06 Pompe à piston alternatif à limitation de débit côté entrée

Country Status (3)

Country Link
EP (1) EP3308019B1 (fr)
DE (1) DE102015007464A1 (fr)
WO (1) WO2016198156A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1358832A (fr) * 1963-06-06 1964-04-17 Controls Co Of America Pompe électrique
CS273485B1 (en) * 1988-10-20 1991-03-12 Stanislav Kucera Electromagnetic piston pump
DE4328621C2 (de) 1993-08-26 2002-11-28 Thomas Magnete Gmbh Elektromagnetisch betreibbare Pumpe, insbesondere Dosierpumpe
DE102006019584B4 (de) * 2006-04-27 2008-06-05 Thomas Magnete Gmbh Dosierpumpe
DE102008055609B4 (de) 2008-11-03 2011-12-29 Thomas Magnete Gmbh Hubkolbenpumpe
DE102014000627B3 (de) 2014-01-17 2015-05-21 Thomas Magnete Gmbh Dosierpumpe mit Druckregler für den Saugdruck sowie Verfahren zum Test, zur Einstellung sowie zum Betrieb der Dosierpumpe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3308019A1 (fr) 2018-04-18
DE102015007464A1 (de) 2016-12-15
WO2016198156A1 (fr) 2016-12-15

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