EP3339648B1 - Flüssigkeitspumpe mit einer luftansaugpumpe und, zwischen den zwei pumpen, einem durch schwimmer betätigten ventil - Google Patents

Flüssigkeitspumpe mit einer luftansaugpumpe und, zwischen den zwei pumpen, einem durch schwimmer betätigten ventil Download PDF

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Publication number
EP3339648B1
EP3339648B1 EP17208932.8A EP17208932A EP3339648B1 EP 3339648 B1 EP3339648 B1 EP 3339648B1 EP 17208932 A EP17208932 A EP 17208932A EP 3339648 B1 EP3339648 B1 EP 3339648B1
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EP
European Patent Office
Prior art keywords
air holes
pump system
pump
float
air
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EP17208932.8A
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English (en)
French (fr)
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EP3339648A1 (de
Inventor
Sam SPEIJERS
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Altop Patents Ii BV
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Altop Patents Ii BV
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/04—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock
    • F04D9/044—Means for rendering the priming pump inoperative
    • F04D9/045—Means for rendering the priming pump inoperative the means being liquid level sensors
    • F04D9/046—Means for rendering the priming pump inoperative the means being liquid level sensors the means being floats

Definitions

  • the present invention relates to a pump system according to the preamble of claim 1.
  • Pump systems comprising a non-self-starting type of pump, such as centrifugal pumps, have a so-termed eye which should be below the level of the liquid medium in a respective pump housing in order to be able to pump the medium. If the eye becomes uncovered by liquid medium, such a pump cannot autonomously draw in new medium and consequently the pump stops operating. To preclude this, the pump system is provided with an air-suction pump or vacuum pump which drains air from the surroundings of the eye and draws in medium. Such an air-suction pump, however, is not water resistant.
  • US-4 029 438 A discloses a pump system in accordance with the preamble of claim 1. It further describes the member being a flexible valve member one side of which is movable, either by being pushed against the air holes to close them or by being pulled from the air holes, which are provided in a flat valve plate positioned in between the hollow -vacuum- body and the float -housing- chamber.
  • the pump system according to the invention is characterized in that the hollow body is a box-shaped body comprising a plurality of flat walls having the air holes, and in that the member is designed such that the air holes of at least two of said flat walls can be closed or opened simultaneously.
  • An advantage of the pump system according to the invention resides in that the float moving up and down with the level of the liquid medium provides a reliable indication of the instantaneous level of the medium in the float chamber.
  • the member can be moved over the air holes in two or more of the walls in order to open or close them simultaneously, thereby advantageously combining sufficient speed and a low air resistance.
  • An embodiment of the pump system according to the invention is characterized in that the movable member is an at least partially elastic member, in particular a curtain, which can move or roll over the air holes.
  • An advantage of the use of an elastic member or curtain resides in that it can be readily pulled over the air holes to close or open air holes in the two or more walls.
  • said closing or opening operation can be performed by rolling, which requires little effort, and which enhances the accuracy and reproducibility.
  • Another embodiment of the pump system according to the invention is characterized in that the movable member is substantially in one of two positions, in which all air holes are closed or open, when the pump system is in operation.
  • a special embodiment of the pump system according to the invention is characterized in that the diameters of the air holes are related to the position of the movable member along the at least one wall of the body, in particular in such a manner that the movement of the movable member extends over first and second air holes, and in that the diameters of at least part of the first air holes are smaller than those of the second air holes.
  • This embodiment has the advantage that, if the movable member starts to move, i.e., when the movable hollow body is under considerable reduced pressure, the air holes open in such a manner that the small air holes open first.
  • this requires comparatively little opening force; briefly put: the movable body does not adhere to the air holes. Subsequently, the opening of the remaining, larger air holes during further movement of the member, at a gradually decreasing underpressure in the hollow body, advantageously requires less effort and little time.
  • Yet another embodiment of the pump system according to the invention is characterized in that the level regulator is provided with a mass and/or spring and/or damper arranged between the float and the movable, possibly elastic, member.
  • FIG. 1 shows a pump system 1 comprising an inlet 2 for a liquid medium to be pumped, such as water containing or not containing air or gas, and an outlet 3.
  • a pump system 1 can be used, for example but not exclusively, as a drainage pump or as a pump for, inter alia, well point dewatering.
  • a pump head 4 which accommodates a rotor blade 5 of a pump 6 of the non-self-starting type, such as a centrifugal pump.
  • the rotor blade 5 has an eye 7 which should be below the level of the liquid, so that the pump 6 itself starts to pump the liquid, by means of the rotating rotor blade 5, to the delivery side which is provided with a non-return valve 8 and which opens into the outlet 3.
  • a level regulator 9 having a top connection for an air-suction pump 10 is connected to the pump head 4.
  • the level regulator 9 makes sure that any water available at the inlet 2 is drawn into the pump head 4 being under reduced pressure by the air suction pump 10 while the non-return valve 8 is usually automatically in a closed state then.
  • the liquid level at the eye 7 is sufficient to enable the pump 6 to self start.
  • the level regulator 9 is provided with a float chamber 11 for collecting, in said float chamber, air and/or medium from the pump head 4, and with a float 12 which floats on the medium and which contains a measure of the level of the medium in the float chamber 11.
  • the level regulator 9 shown in figure 2 comprises a hollow body 13 which is connected to the air suction pump 10 and which has two or, if necessary, more walls 14 which are each provided with air holes 15 for passing air which is drawn from the space above the level of the medium in the float chamber 11 and which is drained via holes 15 in the hollow body 13 by the suction pump 10.
  • holes 15 of certain dimensions in more than two of the walls 14 will be used in particular when required due to the relation between the air passage through the holes 15, the power of the vacuum pump and the volume of medium to be passed through the pipes.
  • larger air holes 15 in a plurality of walls 14 at larger powers and a larger water displacement.
  • the level regulator 9 also comprises a member 16 which is adequately coupled to the float 12 and which can be moved over the air holes 15 along the outside of the two or more walls 14, said member being capable of closing or opening the passage of air through the holes 15.
  • a member 16 which is adequately coupled to the float 12 and which can be moved over the air holes 15 along the outside of the two or more walls 14, said member being capable of closing or opening the passage of air through the holes 15.
  • the level regulator 9 may be provided with a mass and/or spring and/or damper - diagrammatically indicated by means of the letter D- arranged between the float 12 and the movable member 16.
  • the manner in which the member 16 dynamically moves up and down with the level of the medium can be set, for example dependent upon the viscosity of the medium, the flow behaviour in situ and/or the sand grain content or the presence of gases or air bubbles in the medium.
  • the operation of the pump system 1 is such that if there is hardly any water at the inlet 2, the float 12 is located at the bottom of the float chamber 11 and the member 16 leaves all air holes open, as a result of which the air-suction pump 10 draws air from the inlet 2 through all air holes. If the air entrains medium from the inlet 2, the pump head 4 and subsequently the float chamber 11 are filled, causing the float 12 and hence the movable member 16 to move upwards and the air holes 15 to be closed. As a result, air is no longer drawn from the float chamber 11, but the pump 6 starts by itself and pumps medium to the outlet 3 through the non-return valve 8. This continues until the supply of medium through the inlet 2 is insufficient, as a result of which the level in the float chamber 11 falls and the air-suction pump 10 again causes an underpressure of air in the pump head 4 for the purpose of drawing in new medium.
  • the movable member 16 preferably can be at least partly moved elastically over the air holes 15 to be opened and/or closed.
  • a member 16 which is made from a suitable lightweight synthetic resin or, for example, rubber, has been found to be fast, reliable and durable, but also, in particular, it has proved to be low-maintenance in comparison with the member according to the state of the art, which has a favourable effect on the cost price.
  • the movable member 16 may be a simple curtain, such as a rolling curtain, roller blind, pleated curtain, or it may be provided with movable blinds.
  • Figure 3 shows a detailed view of a movable member 13, being a roller blind 16.
  • a roller blind is favourable if it rolls along the outside of one or more flat walls 14 of the hollow body 13 and over the air holes 15, in which case the body 13 is preferably box or cube-shaped, because then the curtain 16 can roll well along one or more walls 14 to open or close the holes 15.
  • the curtain 16 may be movable between longitudinal guides 16-1, which are provided with flexible curtain material on either side. Between said longitudinal guides, the curtain material moves up and down with the float 12.
  • the movement of the member 16 will be such that it is mainly in one of two positions. In one position all air holes 15 are open and in the other position all air holes are closed.
  • FIG 3 an embodiment is shown comprising a rolling curtain 16 whose movement extends over first holes 15-1 and second holes 15-2, and wherein the diameters of at least part of the first air holes 15-1 are smaller than those of the second air holes 15-2.
  • the first small holes 15-1 are located higher in the wall 14 than the second air holes 15-2.
  • a loose coupling between the float 12 and the member 16 enabling the movable member 16, particularly when the float 12 moves downwards, to move downwards at a lower rate, i.e., under the effect of its own weight, independently of the movement of the float.
  • a more fixed coupling D having the mass and/or spring and/or damper explained hereinabove can be used to close the air holes 15-2, 15-1.
  • the float 12 presses with an upward force against the curtain or member 16 as the case may be, possibly through the coupling D, which force equals the volume of the displaced medium times the specific mass.
  • the floating power of the float 12 can be kept low.
  • the embodiment then enables a plurality of air holes to be controlled simultaneously by means of a relatively low self-weight of bracket and movable member 16, leading to little influence on the interplay of forces resulting from the mass of water flowing through.
  • the float 12 is less subject to friction when moving up and down with the liquid level, because a slide bearing on the upper side near the control member 16 can be dispensed with.
  • Such a slide bearing causes variable friction, under the influence of forces exerted on the respective axle, which leads to changing friction resulting in variable reaction times and control errors.
  • an axle has been omitted as well as a fixed mechanical connection, in both opposite directions, between control member 16 and float 12.
  • the float 12 closes the control member 16, but the control member 16 opens on gravity force.
  • the concomitant lateral forces on the bracket, that is exerted on the transverse guide and curtain axis of the member 16, shown in fig. 2 are minimal.
  • the small holes 15-1 open first and if for example four holes having a diameter of 4 mm are being applied at an underpressure of max. 900 mBar than the closing force amounts approximately 450 gram. If thereafter the remaining holes open the underpressure decreases, as a result of which the remaining larger holes 15-2 open much more easily.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Jet Pumps And Other Pumps (AREA)

Claims (13)

  1. Pumpensystem (1), umfassend:
    - eine Pumpe (6), die, um zu funktionieren, erfordert, dass ein Mindestniveau eines flüssigen Mediums in ihren Pumpenkopf (4) gepumpt wird, und die ein Rückschlagventil (8) auf ihrer Druckseite (3) umfasst, und
    - einen Niveauregler (9), der an den Pumpenkopf (4) angeschlossen ist, und der einen Anschluss für eine Luftsaugpumpe (10) aufweist, wobei der Niveauregler (9) ausgestattet ist mit:
    - einer Schwimmerkammer (11), in die Luft und/oder Medium aus dem Pumpenkopf (4) gesammelt wird,
    - einem Schwimmer (12), der sich mit dem Niveau des Mediums in der Schwimmerkammer (11) auf und ab bewegt,
    - einem Hohlkörper (13), der in Betrieb an die Luft-Saugpumpe (10) angeschlossen ist, wobei der Hohlkörper (13) mindestens eine Wand (14) umfasst, die flach ist und Luftlöcher (15; 15-1, 15-2) zwischen dem Hohlkörper (13) und der Schwimmerkammer (11) aufweist, und
    - einem Element (16), das mit dem Schwimmer (12) verbunden ist, und das über die Luftlöcher (15; 15-1, 15-2) entlang der Außenseite der mindestens einen Wand (14) bewegt werden kann, wobei das Element (16) benutzt wird, um die Luftlöcher (15; 15-1, 15-2) zu schließen oder zu öffnen,
    dadurch gekennzeichnet, dass der Hohlkörper ein kastenförmiger Körper (13) ist, der mehrere flache Wände (14) umfasst, welche die Luftlöcher (15; 15-1, 15-2) aufweisen, und dadurch, dass das Element (16) so konfiguriert ist, dass die Luftlöcher (15; 15-1, 15-2) der mindestens zwei flachen Wände (14) gleichzeitig geschlossen oder geöffnet werden können.
  2. Pumpensystem (1) nach Anspruch 1, dadurch gekennzeichnet, dass das bewegliche Element (16) ein mindestens teilweise elastisches Element ist, das sich über die Luftlöcher (15; 15-1, 15-2) bewegen kann.
  3. Pumpensystem (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das bewegliche Element (16) ein Vorhang ist wie ein Rollvorhang, Rollladen, ein Plisseevorhang oder mit beweglichen Lamellen versehen ist.
  4. Pumpensystem (1) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der kastenförmige Körper (13) ein Würfel ist, dessen vier Wände (14), die gegenüberliegende Paare bilden, mit den Luftlöchern (15; 15-1, 15-2) versehen sind, und dass das Element (16) ausgelegt ist, um die Luftlöcher (15; 15-1, 15-2) der vier flachen Wände (14) gleichzeitig zu schließen oder zu öffnen.
  5. Pumpensystem (1) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Luftlöcher (15; 15-1, 15-2) nach einem Muster in der mindestens einen Wand (14) des Hohlkörpers (13) angeordnet sind.
  6. Pumpensystem (1) nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das bewegliche Element (16) im Wesentlichen in einer von zwei Positionen ist, in denen alle Luftlöcher (15; 15-1, 15-2) geschlossen oder offen sind, wenn das Pumpensystem (1) in Betrieb ist.
  7. Pumpensystem (1) nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Durchmesser der Luftlöcher (15; 15-1, 15-2) in Beziehung zu der Position des beweglichen Elements (16) entlang der mindestens einen Wand (14) des Körpers (13) stehen.
  8. Pumpensystem (1) nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Bewegung des beweglichen Elements (16) sich über erste (15-1) und zweite Luftlöcher (15-2) erstreckt, und dass die Durchmesser von mindestens Teil der ersten Luftlöcher (15-1) kleiner als die der zweiten Luftlöcher (15-2) sind.
  9. Pumpensystem (1) nach Anspruch 8, dadurch gekennzeichnet, dass, wenn die Luftlöcher (15; 15-1, 15-2) öffnen, das bewegliche Element (16) in einer Position ist, in der anfänglich der vorstehend erwähnte Teil der ersten Luftlöcher (15-1) die einen kleineren Durchmesser haben, von dem beweglichen Element (16) freigelegt wird.
  10. Pumpensystem (1) nach Anspruch 8 oder 9, dadurch gekennzeichnet, dass die ersten Löcher (15-1) in der Wand (14) des Hohlkörpers (13), der im oberen Teil der Schwimmerkammer (11) gelegen ist, in einer höheren Position sind als die zweiten Luftlöcher (15-2).
  11. Pumpensystem nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass der Niveauregler (9) mit einer Masse und/oder Feder und/oder Dämpfer (D) versehen ist, die/der zwischen dem Schwimmer (12) und dem beweglichen, möglicherweise elastischen Element (16) angeordnet ist.
  12. Pumpensystem (1) nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass der Niveauregler (9) mit einer Kupplung (D) zwischen dem Schwimmer (12) und dem beweglichen, möglicherweise elastischen Element (16) versehen ist, die das bewegliche Element (16) instandsetzt, sich mindestens, wenn der Schwimmer (12) sich nach unten bewegt, sich unabhängig von der Bewegung des Schwimmers (12) und unter Einwirkung seines eigenen Gewichts nach unten zu bewegen.
  13. Pumpensystem (1) nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, dass das bewegliche Element (16) Gummi umfasst.
EP17208932.8A 2016-12-21 2017-12-20 Flüssigkeitspumpe mit einer luftansaugpumpe und, zwischen den zwei pumpen, einem durch schwimmer betätigten ventil Active EP3339648B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL17208932T PL3339648T3 (pl) 2016-12-21 2017-12-20 Pompa cieczy z pompą powietrza zalewającego i, pomiędzy tymi dwiema pompami, zawór sterowany pływakowo

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2018034A NL2018034B1 (nl) 2016-12-21 2016-12-21 Lucht separator

Publications (2)

Publication Number Publication Date
EP3339648A1 EP3339648A1 (de) 2018-06-27
EP3339648B1 true EP3339648B1 (de) 2019-07-24

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EP17208932.8A Active EP3339648B1 (de) 2016-12-21 2017-12-20 Flüssigkeitspumpe mit einer luftansaugpumpe und, zwischen den zwei pumpen, einem durch schwimmer betätigten ventil

Country Status (6)

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EP (1) EP3339648B1 (de)
DK (1) DK3339648T3 (de)
ES (1) ES2752231T3 (de)
NL (1) NL2018034B1 (de)
PL (1) PL3339648T3 (de)
PT (1) PT3339648T (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023068920A1 (en) * 2021-10-21 2023-04-27 Ngui Min Chee Kenneth A dual-valve liquid level regulating system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1943536A (en) * 1927-05-25 1934-01-16 Muller Jacques Valve mechanism for cutting off the supply of liquid to reservoirs, casks, and other containers
FR740812A (fr) * 1932-07-23 1933-02-01 Perfectionnements aux systèmes comprenant une pompe hydraulique
US2180173A (en) * 1937-12-20 1939-11-14 Share Barnett Float valve for hydraulic pumping systems
US4029438A (en) * 1975-10-20 1977-06-14 Sloan Albert H Well point pumping system and pump assembly therefor
GB1486277A (en) * 1975-10-31 1977-09-21 Selwood Ltd W Pump intake units
US5957150A (en) * 1997-03-31 1999-09-28 Nelson Irrigation Corporation Air release valve

Non-Patent Citations (1)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023068920A1 (en) * 2021-10-21 2023-04-27 Ngui Min Chee Kenneth A dual-valve liquid level regulating system

Also Published As

Publication number Publication date
ES2752231T3 (es) 2020-04-03
NL2018034B1 (nl) 2018-06-28
PL3339648T3 (pl) 2020-04-30
PT3339648T (pt) 2019-11-04
EP3339648A1 (de) 2018-06-27
DK3339648T3 (da) 2019-10-28

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