EP0148069B1 - Vakuumpumpeneinrichtungen mit Kühlflüssigkeit unter konstantem Druck - Google Patents

Vakuumpumpeneinrichtungen mit Kühlflüssigkeit unter konstantem Druck Download PDF

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Publication number
EP0148069B1
EP0148069B1 EP84402596A EP84402596A EP0148069B1 EP 0148069 B1 EP0148069 B1 EP 0148069B1 EP 84402596 A EP84402596 A EP 84402596A EP 84402596 A EP84402596 A EP 84402596A EP 0148069 B1 EP0148069 B1 EP 0148069B1
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EP
European Patent Office
Prior art keywords
pump
cooling liquid
gas
conduit
whose
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.)
Expired
Application number
EP84402596A
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English (en)
French (fr)
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EP0148069A2 (de
EP0148069A3 (en
Inventor
Pierre Robert Laguilharre
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Individual
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Individual
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Application filed by Individual filed Critical Individual
Priority to AT84402596T priority Critical patent/ATE44585T1/de
Publication of EP0148069A2 publication Critical patent/EP0148069A2/de
Publication of EP0148069A3 publication Critical patent/EP0148069A3/fr
Application granted granted Critical
Publication of EP0148069B1 publication Critical patent/EP0148069B1/de
Expired legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
    • F04C19/004—Details concerning the operating liquid, e.g. nature, separation, cooling, cleaning, control of the supply

Definitions

  • the present invention relates to an installation for producing a reduced pressure in an enclosure, which comprises at least one liquid ring vacuum pump, the suction chamber of which is provided with a gas suction duct, the chamber of which discharge is provided with a suction gas discharge conduit conveying driven coolant and whose cylindrical body containing the impeller is provided with a coolant inlet disposed on the suction side of the pump body.
  • the coolant is constituted by water, it being understood that it can in fact be made up of any low-volatility liquid of low viscosity .
  • the first drawback is due to the absence of vacuum at start-up in the suction compartment of the vacuum pump, a vacuum which contributes to the admission of cooling water into the pump body.
  • a vacuum which contributes to the admission of cooling water into the pump body.
  • the second drawback is due to the significant variation, during the rise in vacuum, of the flow of cooling water sucked into the body of the pump, flow which tends towards zero at the start of the rise in vacuum and gradually increases to stabilize at final vacuum, this progressive increase in the flow rate being linked to the increase in the vacuum prevailing in the enclosure during the rise in vacuum.
  • US-A-2 044 867 describes a rotary vacuum pump such as a vane pump, the gas suction conduit of which includes means for reducing the power absorbed at start-up.
  • the object of the present invention is to remedy the drawbacks mentioned above and to do this, it proposes an installation of the type defined in the first paragraph of this description, which is characterized in that the gas suction pipe is connected by at least a first means of communication to said enclosure, the coolant supply cooperates with a coolant coolant supply circuit at constant pressure and a means generating a pressure drop is arranged in the conduit gas suction or in said first communication means, the means generating a pressure drop being constituted by a diaphragm with constant opening section chosen to create almost instantaneously at pump start-up a reduced pressure in the pressure chamber aspiration of said pump, and therefore, to obtain, when the pump is started, the instantaneous formation of the liquid ring in the pump and the almost immediate compensation of the liquid refrigeration rejected by the discharge pipe.
  • the flow rate of the suctioned refrigerating liquid is constant until the pressure in the enclosure to be evacuated reaches the predetermined reduced pressure existing downstream of the means for creating the pressure drop. This results in a perfectly regular vacuum rise during this first phase.
  • the means for creating the pressure drop can be of any design.
  • it could be a diaphragm whose opening is suitably sized to create the desired predetermined reduced pressure almost instantaneously.
  • It could also be a valve with two opening positions, a position of small opening suitable for the almost instantaneous creation of said reduced pressure and a position of greatest opening; this valve will preferably be of the automatic servo-controlled valve type so that it is brought from the position of small opening to the position of largest opening when the pressure in the enclosure changes from a value greater than said reduced pressure predetermined value equal to or less than the latter.
  • valves and its mode of slaving to the pressure prevailing in the chamber to be evacuated are perfectly known to those skilled in the art and a more detailed description of these means is unnecessary. It is also possible that the automatic valve is slaved to the power absorbed by the pump, the transition from the position of small opening to the position of largest opening being obtained when the power absorbed by the pump increases at the time of the passage of the first vacuum phase to the second vacuum phase.
  • the coolant in the tank may, in accordance with invention, to be in a horizontal plane located indifferently at the height of the longitudinal axis of the pump, below or even above this axis.
  • the discharge chamber of the pump is provided at its base with an outlet for refrigeration liquid discharged by said pump.
  • This outlet through which all or part of the rejected refrigerant can be evacuated, makes it possible to increase the pressure of the refrigerant in the refrigerant supply circuit without disadvantage, and in particular to raise the level of the refrigerant in the constant level tank.
  • said outlet cooperates with a means for creating between this outlet and the atmosphere a column of liquid of variable height
  • this means can for example be constituted by a U-shaped tube, one of the branches of which is connected to the liquid outlet. refrigeration rejected and the other branch of which is open to the atmosphere and of variable height. Thanks to this means, it is possible to adjust the water level in the cylindrical body of the stopped pump in order to prime the pump more easily and safely.
  • the outlet of the rejected coolant or the means for creating a column of liquid is provided with a diaphragm for metering the flow rate of the coolant released by the pump, so that the latter is free of gas. repressed.
  • the supply of coolant is in a horizontal plane located above the longitudinal axis of the cylindrical body containing the impeller, that is to say at a level desirable for good performance, this being made possible by the characteristics of the invention, even if for example the water level in the coolant tank is in a horizontal plane located below this axis.
  • suction gas discharge pipe can cooperate via a third means of communication with the coolant supply circuit at constant pressure with a view to recycling all or part of the coolant carried by the gas sucked.
  • the liquid ring vacuum pump 1 represented by FIGS. 1 and 2 comprises, in a manner known per se, a cylindrical body 2 partially filled with water and in which rotates a paddle wheel 3 whose hub 4 is wedged on a eccentric shaft 5 and rotated by a motor 6. This water, set in motion by the impeller 3 is projected against the body 2 and forms a water ring 7 which determines a cell 8 with the hub 4.
  • the rotating vanes move in this cell 8 by delimiting spaces whose volume increases in the zone situated to the right of the vertical plane of symmetry of FIG. 2 and decreases in the zone situated to the left of said vertical plane of symmetry.
  • the pump 1 also furthermore comprises, in a manner known per se, an enclosure 9 adjoining the front wall 10 of the body 2, this enclosure being divided by a partition 11 into a suction chamber 12 and a discharge chamber 13.
  • the chamber suction 12 communicates with the cell 8 through an opening 14 and the delivery chamber 13 communicates with this same cell through an opening 15 smaller than the opening 14, the openings 14 and 15 being formed in the wall 10.
  • the chamber 12 is provided on its cylindrical wall with a gas suction duct 16 and the chamber 13 is provided on its cylindrical wall with a duct 17 for discharging the sucked gas and the discharged refrigeration water by the pump 1.
  • the cylindrical body 2 is provided with an inlet 18 for cooling water disposed on the suction side of the pump body 2 and situated in a horizontal plane extending above the longitudinal axis of the pump.
  • the gas to be conveyed is sucked in through line 16 and discharged through line 17.
  • the suction duct 16 is connected to the enclosure where it is desired to create the vacuum (not shown) by a tube 19 equipped with a check valve 20 which allows to isolate the pump enclosure when the pump stops.
  • a tube 19 equipped with a check valve 20 which allows to isolate the pump enclosure when the pump stops.
  • the installations which are the subject of FIGS. 3 and 4 each comprise means 31 generating a pressure drop arranged in the tube 19, this means being constituted in the present case by a diaphragm whose opening is dimensioned for instantly create, when the pump 1 starts, a reduced pressure in the suction chamber 12, in the body of the pump 2 (suction side) and in the tube 19 downstream of said diaphragm 31 and, consequently, an instant suction of the cooling water from the tank 21 through the inlet 18 and therefore compensation for the rejected water carried by the pumped gas.
  • the discharge chamber 13 of the pump 1 is provided at its base with an outlet 32 through which all or part of the said discharged water carried by the discharged gas can be discharged.
  • the possible balance of this rejected water is evacuated with the gas discharged through the discharge pipe 17 extended by a pipe 33 ending in a three-way valve 34 allowing said pipe 33 to be put in connection either with a pipe 35 ending for example in a tank (not shown) for receiving the discharged water, or with a pipe 36 opening into the tank 21 above the constant level, in which case there is recycling of the balance of rejected refrigeration water.
  • the outlet 32 can cooperate with a means creating a water column between said outlet 32 and the atmosphere.
  • this means is constituted by a U-shaped tube 38, one 39 of the branches 39, 40 is connected to the outlet 32 and the other branch 40 is open to the atmosphere, the branches 39, 40 being connected together by a horizontal branch 41 and the branch 40 opening into the tank 21 above the constant level in the case of the installation in FIG. 4.
  • the invention can vary the height of the water column in the means 38, for example by pivoting of the branch 40 around the branch 41 and in a vertical plane, means 42 allowing this pivoting being provided for this purpose between the branch 40 and the branch 41.
  • the free end of the branch 40 in the high position is situated in the horizontal plane passing through the longitudinal axis of the pump and in the installation of FIG. 4, the free end of this branch 40 in the high position is located in the horizontal plane passing through l hub axis 4.
  • a diaphragm 43 is disposed in the outlet 32 or in the U-shaped tube 38, with a diaphragm allowing the quantity of water evacuated by this channel to be measured so that there is no gases escaping simultaneously via this same route.
  • a diaphragm 44 can be placed on the tubing 26, 28 the latter having the function of regulating the quantity of water admitted into the pump body 2.
  • the valve 24 being in the open position, the water in the tank 21 is located at level I.
  • This water flows by gravity into the pump body 2 via from the tubing 26 and is immediately evacuated from the pump by the outlet 32 and the U-shaped tube 38.
  • the water in the pump body 2 is located between the level II (which is located in the horizontal plane passing through the base of the openings 14, 15) and level IV (which is in the horizontal plane passing through the longitudinal axis of the pump 1) according to the pivoting position of the branch 40, this is that is to say always at a level not likely to cause damage to the blades when the pump starts.
  • the valve 24 is in the closed position when stopped, the water level in the body 2 is established in the same manner as above between position II and position IV, the water in the tank 21 stabilizing at level III located in the horizontal plane passing through the arrival 18.
  • the valve 30 being in the open or closed position, the water is situated at level V (outlet level of the overflow 27).
  • level VI located in the horizontal plane passing through the axis of the hub 4, this level being as previously adjustable as a function of the pivoting position of branch 40, the lowest level being level II.
  • the water stabilizes in the body 2 at a level which presents no danger for the pump 1.
  • the cooling water is, as soon as this pump is started, sucked into the body 2, the valve 30 being in the open position, thanks to the presence of the diaphragm 31.
  • pump 1 establishes a flow rate of aspirated gas of approximately 100 m 3 / h under a vacuum of in the enclosure to be evacuated.
  • This leak can be symbolized and replaced by an opening made on the enclosure, for example having a diameter of 5 mm.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Reciprocating Pumps (AREA)

Claims (8)

1. Einrichtung zum Erzeugen von Unterdruck in einem Behälter, mit wenigstens einer mit einem
Flüssigkeitsring arbeitenden Vakuumpumpe (1), deren Ansaugkammer (12) mit einer Gasansaugleitung (16) und deren Austrittskammer mit einer Austrittsleitung (17) für das auszustoßende, von der Kühlflüssigkeit angesaugte und geförderte Gas versehen ist, und die weiterhin einen zylindrischen Pumpenkörper (2) besitzt, der ein Schaufelrad (3) umschließt und mit einem auf seiner Ansaugseite angeordneten Zuleitungsanschluß (18) für die Kühlflüssigkeit versehen ist, dadurch gekennzeichnet, daß die Gasansaugleitung (16) über mindestens ein erstes Verbindungsmittel (19) mit dem Behälter verbunden ist, daß der Zuleitungsanschluß (18) für die Kühlflüssigkeit mit einem die Kühlflüssigkeit unter konstantem Druck enthaltenden Versorgungskreis (21 bis 26; 21, 27 bis 30) zusammenwirkt, und daß in der Gasansaugleitung (16) oder in dem ersten Verbindungsmittel (19) ein einen Druckabfall bewirkendes Mittel (31) vorgesehen ist, das aus einer Lochblende (31) mit konstant gewähltem Öffnungsquerschnitt besteht, um beim Anlaufen der Pumpe sofort einen Unterdruck in der Ansaugkammer (12) der Pumpe (1) zu erzeugen und somit um beim Anlaufen der Pumpe (1) darin die sofortige Bildung des Flüssigkeitsringes sowie die nahezu sofortige Kompensation der durch die Austrittsleitung (17) ausgeworfenen Kühlflüssigkeit zu erzielen.
2. Einrichtung nach Anspruch 1, bei der der die Kühlflüssigkeit unter konstantem Druck enthaltende Versorgungskreis ein die Kühlflüssigkeit auf konstantem Niveau haltendes Gefäß (21) aufweist, das über ein zweites Verbindungsmittel (26; 28) mit dem Zuleitungsanschluß (18) für die Kühlflüssigkeit verbunden ist, deren Flüssigkeitsspiegel in dem Gefäß (21) etwa in Höhe der Längsachse der Pumpe (1) oder auch unterhalb dieser Achse liegt.
3. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Austrittskammer (13) der Pumpe (1) in ihrem Boden einen Auslaß (32) für die durch die Pumpe zurückgeworfene Flüssigkeit aufweist.
4. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, daß der Auslaß (32) mit einem Mittel zusammenwirkt, um zwischen diesem Auslaß und der Atmosphäre eine Flüssigkeitssäule von variabler Höhe zu erzeugen.
5. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, daß das Mittel zum Erzeugen der Flüssigkeitssäule aus einem U-Rohr (38) besteht, dessen einer Rohrschenkel (39) mit dem Auslaß (32) und dessen anderer Rohrschenkel (40) mit der Atmosphäre verbunden und höhenveränderlich ist.
6. Einrichtung nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß der Auslaß (32) für die zurückgeworfene Kühlflüssigkeit oder das eine Flüssigkeitssäule erzeugende U-Rohr (38) mit einer Lochblende (43) für die Dosierung der aus der Pumpe abgeschleuderten Flüssigkeitsmenge versehen ist.
7. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Gas-Austrittsleitung (17) über die Zwischenschaltung eines dritten Verbindungsmittels (33, 34, 36; 37) mit dem Versorgungskreis für die unter konstantem Druck stehende Kühlflüssigkeit im Sinne der vollständigen oder teilweisen Wiedergewinnung der Kühlflüssigkeit durch das angesaugte Gas zusammenwirkt.
EP84402596A 1983-12-14 1984-12-14 Vakuumpumpeneinrichtungen mit Kühlflüssigkeit unter konstantem Druck Expired EP0148069B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84402596T ATE44585T1 (de) 1983-12-14 1984-12-14 Vakuumpumpeneinrichtungen mit kuehlfluessigkeit unter konstantem druck.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8320077 1983-12-14
FR8320077A FR2556788B1 (fr) 1983-12-14 1983-12-14 Perfectionnement aux installations du type pompe a vide alimentee par un liquide de refrigeration sous pression constante

Publications (3)

Publication Number Publication Date
EP0148069A2 EP0148069A2 (de) 1985-07-10
EP0148069A3 EP0148069A3 (en) 1985-08-14
EP0148069B1 true EP0148069B1 (de) 1989-07-12

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ID=9295190

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EP84402596A Expired EP0148069B1 (de) 1983-12-14 1984-12-14 Vakuumpumpeneinrichtungen mit Kühlflüssigkeit unter konstantem Druck

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EP (1) EP0148069B1 (de)
AT (1) ATE44585T1 (de)
DE (1) DE3478945D1 (de)
FR (1) FR2556788B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE519641C2 (sv) 2001-08-08 2003-03-25 Metso Paper Inc Kombinerad centrifugal- och vakuumpump för pumpning av massa
JP2015036516A (ja) * 2013-08-12 2015-02-23 株式会社ネクスト 水封式水蒸気圧縮機
CN113217387B (zh) * 2021-05-22 2022-08-12 浙江恒翔神工真空科技有限公司 一种返油抗污真空泵

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2044867A (en) * 1934-06-01 1936-06-23 Ingersoll Rand Co Regulating device for vacuum pumps
GB508897A (en) * 1938-04-11 1939-07-07 Edward James Hutchins Norman Improvements in and relating to rotary pumps of the water-ring type
FR909168A (fr) * 1941-11-29 1946-05-01 Perfectionnements aux génératrices de gaz à anneau liquide
US2771860A (en) * 1950-08-22 1956-11-27 Werner P Falk Hydraulic machine
US3108738A (en) * 1958-12-30 1963-10-29 Siemen & Hinsch Gmbh Liquid-ring gas pumps
FR1276528A (fr) * 1960-12-22 1961-11-17 Dispositif de support du rotor dans les pompes rotatives à anneau liquide
BE664205A (de) * 1964-05-20

Also Published As

Publication number Publication date
FR2556788A1 (fr) 1985-06-21
DE3478945D1 (en) 1989-08-17
ATE44585T1 (de) 1989-07-15
FR2556788B1 (fr) 1988-04-22
EP0148069A2 (de) 1985-07-10
EP0148069A3 (en) 1985-08-14

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