[0001] This invention relates to a lubricated vacuum pump.
[0002] More specifically, the lubricated vacuum pump according to the invention addresses
the technical field of lubricated vacuum pumps of a rotary type, such as, for example,
pumps with blades. Considering a lubricated vacuum pump with blades, it comprises
a stator body having a compartment for housing a rotor.
[0003] The rotor has a plurality of seats for housing respective blades, which are slidable
in the respective housing seat, which, during the rotation of the rotor move to a
position furthest away from the centre of rotation of the rotor, pressing against
the walls of the housing compartment.
[0004] The rotor in the housing compartment is positioned in an eccentric fashion, thereby
defining a suction chamber in the form of a quarter of a circle, at the ends of which
are located the suction channel and the discharge channel of the chamber.
[0005] Upstream of the suction channel there is a suction valve whose opening and closing
is determined by the pressure difference between the air volume upstream of the channel
and the suction chamber.
[0006] In the case of switching off or failure of the pump, the closing of the suction valve
is very important, since, closing the suction channel maintains the degree of vacuum
of the volume of air upstream of the same and prevents the oil, drawn by the low pressure,
from filling the suction chamber.
[0007] In a lubricated pump, the discharge channel of the suction chamber leads to a chamber
for containing lubricating oil.
[0008] Document
DE1403069 describes a known lubricated rotory pump.
[0009] Downstream of the discharge channel there is a discharge valve, the opening and closing
of which determines the passage, from the suction chamber to the containment chamber,
of a dispersion of oil in air.
[0010] Patent document
GB1556643 describes a vacuum pump with blades of the lubricated type in which use is made of
a discharge valve of the type with segments which, during normal operation of the
pump, is completely immersed by the oil which flows from the suction chamber inside
the containment chamber, through the discharge duct.
[0011] In the case of switching off or failure of the pump, the flow rate of oil entering
the containment chamber decreases and the containment chamber empties of the oil contained
therein.
[0012] The level of oil in the containment chamber decreases until the orifice of the segment
of the discharge valve is in communication with the air which, through the orifice,
flows into the suction chamber.
[0013] In this way, the pressure of the suction chamber is greater than the pressure upstream
of the suction valve, causing its closure.
[0014] An alternative embodiment for controlling the closing of the suction valve is found
in patent document
US2013/0251578 which comprises making a plurality of compensation channels, each of which is formed
by recesses covered by a respective segment of the closing valve in such a way as
to define a air inlet channel in communication with the discharge duct.
[0015] In the case of switching off or failure of the pump, the air is sucked through the
compensation channels inside the suction chamber, in such a way as to generate a compensation
of the pressure and to bring the suction chamber to atmospheric pressure resulting
in the closure of the suction valve.
[0016] In this context, the need is felt of providing an alternative solution in a lubricated
vacuum pump for controlling the closure of the suction valve in the case of switching
off or failure of the pump.
[0017] In this context, one aspect of this invention is that of providing a lubricated vacuum
pump comprising a stator body having a compartment for housing a rotor positioned
eccentrically in the compartment to define a suction chamber.
[0018] The pump has a duct for supplying a gaseous fluid and one or more ducts for discharging
a dispersion of a lubricating fluid in the gaseous fluid.
[0019] A suction valve, positioned along the supply duct is configured for passing from
an open position to a closed position and vice versa, adjusting the passage of the
gaseous fluid in the suction chamber.
[0020] The pump comprises a chamber for containing lubricating liquid, in fluid communication
with the one or more discharging ducts, which has a dividing wall which delimits a
compartment for containing the lubricating liquid, into which lead the one or more
discharging ducts, and a tank for collecting the excess lubricating liquid contained
in the containment compartment.
[0021] The compartment for containing the lubricating fluid being in fluid communication
with the suction chamber by means of the one or more discharging ducts.
[0022] At least one discharge valve, configured to pass from an open position to a closed
position and vice versa, adjusts the passage of the dispersion of lubricating fluid
in the gaseous fluid from a respective discharging duct to the compartment for containing
the lubricating fluid.
[0023] The pump comprises at least one duct for connecting the chamber for containing the
lubricating fluid with the suction chamber. The connecting duct extends at least partly
in the dividing wall of the chamber for containing the lubricating liquid and leads
inside the suction chamber.
[0024] Further features and advantages of this invention are more apparent in the detailed
description below, with reference to a preferred, non-limiting, embodiment of lubricated
vacuum pump as illustrated in the accompanying drawings, in which:
- Figure 1 illustrates a schematic cross section view of a lubricated vacuum pump according
to the invention during a normal operating condition;
- Figure 2 illustrates the pump of Figure 1 during a switched OFF or failed condition.
[0025] The numeral 1 indicates a lubricated vacuum pump according to the invention.
[0026] The pump 1 comprises a stator body 2 comprising a compartment 3 for housing a rotor
4 positioned eccentrically in the compartment 3 to define a suction chamber 5.
[0027] The pump 1 has a supply duct 6 and one or more discharge ducts 7.
[0028] The rotor 4, in the embodiment illustrated, has a plurality of seats 8 for housing
respective blades 9, each slidable in the respective housing seat 8.
[0029] During the operation of the pump, the rotor 4 rotates about its axis of rotation
4a, and the blades 9 move to a position furthest away from the axis 4a of rotation
of the rotor 4, pressing against the walls of the compartment 3 of the stator body
2.
[0030] The pump 1 comprises a suction valve 10 positioned along the supply duct 6.
[0031] The suction valve 10 is configured for passing from an open position to a closed
position and vice versa, adjusting the passage of a gaseous fluid in the suction chamber
5.
[0032] The gaseous fluid is a compressible fluid, such as, for example, air or other gases.
[0033] During normal operation of the pump 1, the suction valve 10 is open to ensure flow
of the gaseous fluid into the suction chamber 5 of the pump 1. In the event of a switching
off or fault of the pump 1, the suction valve 10 passes from the open condition to
the closed condition of the supply duct 6.
[0034] The suction valve 10 may be a spring type plate valve or a pneumatic or electric
valve.
[0035] The pump 1 illustrated has a plurality of discharge ducts 7, with reference to a
direction of extension of the pump parallel to the axis of rotation 4a of the rotor
4.
[0036] The pump 1 comprises a chamber for containing lubricating liquid 11, in fluid communication
with the one or more discharge ducts 7.
[0037] The chamber for containing lubricating liquid 11 has a dividing wall 12 which delimits
a compartment 13 for containing the lubricating liquid, into which lead the one or
more discharging ducts 7, and a tank 14 for collecting the excess lubricating liquid
contained in the containment compartment 13.
[0038] The term lubricating liquid means a lubricating substance, such as, for example,
oil, of a mineral and/or silicone and/or synthetic origin.
[0039] The chamber for containing lubricating liquid 11 has an air zone 15 defined by the
volume of air above the surface of the liquid lubricant contained therein.
[0040] The dividing wall 12 has a top surface 18.
[0041] The top surface 18 is a surface facing towards the volume of air of the chamber for
containing lubricating liquid 11.
[0042] The dividing wall 12 has a first and a second side surface 20 and 21 respectively
delimiting the containment compartment 13 and the tank 14 for collecting the excess
lubricating fluid contained in the containment compartment 13.
[0043] The first side surface 20 of the dividing wall 12 defines one of the side walls of
the containment compartment 13.
[0044] The second side surface 21 of the dividing wall 12 defines one of the side walls
of the collecting tank 14.
[0045] The top surface 18 is contiguous with the first and second side surface 20 and 21
of the dividing wall 12.
[0046] The pump 1 comprises a discharge valve 16, configured to pass from an open position
to a closed position and vice versa, to adjust the passage of a dispersion of lubricating
fluid in the gaseous fluid from a respective discharge duct 7 to the compartment 13
for containing the lubricating fluid. Each discharge duct 7 has a respective inlet
opening 7a, in fluid communication with the suction chamber 5, and a respective outlet
opening 7b, in fluid communication with the containment compartment 13 of the lubricating
fluid.
[0047] The discharge valve 16 is located facing the respective outlet mouth 7b. According
to the preferred variant embodiment, the discharge valve 16 is a flexible valve of
a laminar type.
[0048] According to the invention, the pump 1 has at least one duct 17 for connecting the
chamber for containing the lubricating fluid 11 with the suction chamber 5.
[0049] The connecting duct 17 extends at least partly in the dividing wall 12 of the chamber
for containing the lubricating liquid 11 and leads inside the suction chamber 5.
[0050] The connecting duct 17 extends at least partly in the dividing wall 12 of the chamber
for containing the lubricating fluid 11 and at least partly in the stator body 2 of
the pump 1.
[0051] More specifically, the connecting duct 17 has a first opening 17a in fluid communication
with chamber for containing lubricating liquid 11 and a second opening 17b in fluid
communication with the suction chamber 5. The first opening 17a is positioned at the
top surface 18 of the dividing wall 12.
[0052] The second opening 17b is positioned inside the suction chamber 5 in the vicinity
of the discharge duct 7.
[0053] More specifically, defining as alpha "α" an angle defined by a first joining of the
centre of the rotor 4 with the point of maximum vicinity of the stator body 2 with
the rotor 4 and a second joining of the centre of the rotor 4 with the second opening
17b of the discharge duct 7, the value of the angle alpha is between 20° and 60°,
included. According to an embodiment, the pump 1 can have a plurality of connecting
conduits 17, with reference to a direction of extension of the pump 1 parallel to
the axis of rotation 4a of the rotor 4, each having a respective first opening 17a,
positioned at the top surface 18 of the dividing wall 12, and a respective second
opening 17b, leading inside the suction chamber 5.
[0054] Means 19 for adjusting the fluid flow rate are positioned along the respective connecting
duct 17.
[0055] The adjusting means 19 according to preferred variant embodiment are in the form
of a nozzle.
[0056] Under normal operating conditions of the pump 1, by means of the rotation of the
rotor 4, a dispersion of lubricating fluid in the gaseous fluid is expelled from the
suction chamber 5 through the discharge duct 7.
[0057] The overpressure between the inlet opening 7a of the discharge channels 7 and the
containment compartment 13 of the lubricating fluid keeps the discharge valve 16 open.
[0058] In this operating condition, the containment compartment 13 fills completely with
lubricating liquid and the excess flows into the collection tank 14 thereby defining
a film of lubricating fluid on the top surface 18 of the dividing wall 12 of the containment
compartment 13 and of the tank 14 for collecting the excess lubricating liquid.
[0059] The discharge valve 16 operates in a bath of lubricating liquid in the containment
compartment 13.
[0060] Under normal operating conditions of the pump 1, the connecting duct 17 is filled
with the lubricant which derives from the inside of the suction chamber 5 and by at
least part of the excess of the containment compartment 13.
[0061] In any case, under steady-state conditions, the connecting duct 17, filled with lubricating
fluid, has the first inlet opening 17a occluded by the film of lubricating liquid
present on the top surface of the dividing wall 12, as shown in Figure 1.
[0062] This condition continues since, with each rotation of the rotor 4 about its axis
4a, a dispersion of lubricating fluid in the gaseous fluid is continually expelled
in the containment compartment 13 and the excess of lubricating liquid which flows
from the compartment 13 into the collection tank 14 guarantees the presence of the
lubricating liquid film on the top surface of the dividing wall 12.
[0063] In this way, the lubricating liquid prevents the entry of air in the suction chamber
5.
[0064] In the case of a switching off or malfunction of the pump 1, the flow of the dispersion
of lubricating fluid in the gaseous fluid from the suction chamber 5 in the containment
compartment 13 decreases until stopping in relation to the rotation of the rotor 4
about the relative axis 4a.
[0065] In this condition, the discharge valve 16 passes from the open position to the closed
position of the discharge opening 7b of the discharge duct 7.
[0066] The film of lubricating liquid present on the top surface 18 finishes, since the
flow of the dispersion of lubricating liquid in the gaseous fluid in the containment
compartment 13 stops. The lubricating liquid contained in the connecting duct 17 is
drawn inside the suction compartment 5, thus emptying the channel 17.
[0067] Since the first opening 17a of the connecting duct 17 is in communication with the
air zone 15 the chamber for containing the lubricating fluid 11, as it no longer occluded
by the film of lubricating liquid, the air can flow inside the connection duct 17
in the suction chamber 5, through the second opening 17b, as illustrated in Figure
2.
[0068] The overpressure created in the suction chamber 5, defined by the air introduced
by the connecting conduit, allows the suction valve 10 to be changed from the open
position to the closed position.
[0069] Advantageously, the presence of the means 19 for adjusting the flow rate inside the
connection duct 17 make it possible to adjust the flow rate of liquid lubricant and
air which are introduced into the suction chamber 5 through the channel 17.
[0070] In order to limit the noise of the pump 1 according to the invention, it comprises
at least one channel for conveying 22 air having a first opening 22a for inlet of
the air in fluid communication with the chamber for containing lubricating liquid
11 in an air zone 15 and a second opening 22b for outlet of the air leading into the
suction chamber 5.
[0071] The air conveying channel 22 extends at least partly in the stator body 2.
[0072] The second opening 22b for outlet of the air from the air conveying channel 22 is
positioned in the vicinity of the discharge duct 7.
[0073] More specifically, defining as beta "β" an angle defined by a first joining f the
centre of the rotor 4 with the point of maximum vicinity of the stator body 2 with
the rotor 4 and a second joining of the centre of the rotor 4 with the second opening
22b for outlet of the from the air conveying channel 22, the value of the angle beta
is between 20° and 90°, included. Means 23 for adjusting the flow of air are positioned
along the respective channel for conveying air 22, preferably being positioned close
to the first opening 22a for inlet of the air.
[0074] Preferably, the adjusting means 23 are in the form of a nozzle.
[0075] Advantageously, the adjusting means 23 guarantee a constant and predictable air flow
rate.
1. A lubricated vacuum pump comprising a stator body (2) having a compartment (3) for
housing a rotor (4) positioned eccentrically inside the compartment (2) to define
a suction chamber (5);
the pump (1) has a duct (6) for supplying a gaseous fluid and one or more ducts (7)
for discharging a dispersion of a lubricating fluid in the gaseous fluid;
a suction valve (10), positioned along the supply duct (6) is configured for passing
from an open position to a closed position and vice versa, adjusting the passage of
the gaseous fluid in the suction chamber (5);
the pump (1) comprises a chamber for containing lubricating liquid (11), in fluid
communication with the one or more discharging ducts (7), which has a dividing wall
(12) which delimits a compartment (13) for containing the lubricating liquid, into
which lead the one or more discharging ducts (7), and a tank (14) for collecting the
excess lubricating liquid contained in the containment compartment (13);
the compartment (13) for containing the lubricating fluid being in fluid communication
with the suction chamber (5) by means of the one or more discharging ducts (7);
at least one discharge valve (16), configured to pass from an open position to a closed
position and vice versa, adjusts the passage of the dispersion of lubricating fluid
in the gaseous fluid from a respective discharging duct (7) to the compartment (13)
for containing the lubricating fluid;
the pump comprises at least one duct (17) for connecting the chamber for containing
the lubricating liquid (11) with the suction chamber (5); the connecting duct (17)
extending at least partly in the dividing wall (12) of the chamber for containing
the lubricating liquid (11) and leading inside the suction chamber (5);
the connecting duct (17) extends at least partly in the dividing wall (12) of the
chamber for containing the lubricating fluid (11) and at least partly in the stator
body (2) of the pump (1);
the connecting duct (17) has a respective first opening (17a), in fluid communication
with the chamber for containing the lubricating liquid (11), leading from the dividing
wall (12);
characterised in that the dividing wall (12) has a first and a second side surface (20, 21), respectively
delimiting the containment compartment (13) and the tank (14) for collecting the excess
lubricating liquid, and a top surface (18) adjacent to the first and second side surface
(20, 21) of the dividing wall (12); the first opening (17a) of the connecting duct
(17) is positioned at the top surface (18) of the dividing wall (12).
2. The pump according to any one of the preceding claims, characterised in that the connecting duct (17) has a respective second opening (17b) in fluid communication
with the suction chamber (5).
3. The pump according to claim 2, characterised in that the second opening (17b) is positioned in the vicinity of a respective discharge
duct (7).
4. The pump according to any one of the preceding claims, characterised in that it comprises means (19) for adjusting the flow of fluid positioned along the respective
connecting duct (17).
5. The pump according to any one of the preceding claims, characterised in that it comprises at least one channel for conveying air (22) having a first opening (22a)
for inlet of the air in fluid communication with the chamber for containing lubricating
liquid (11) in an air zone (15) and a second opening (22b) for outlet of the air leading
into the suction chamber (5).
6. The pump according to claim 5, characterised in that it comprises means (23) for adjusting the flow of air positioned along the respective
channel for conveying air (22), preferably being positioned close to the first opening
(22a) for inlet of the air.
7. The pump according to claim 5 or 6, characterised in that an air conveying channel (22) extends at least partly in the stator body (2).
8. The pump according to any one of claims 5 to 7, characterised in that the second opening (22b) for outlet of the air of the air conveying channel (22)
is positioned in the vicinity of a respective discharge duct (7); a first joining
of the centre of the rotor (4) with the point of maximum vicinity of the stator body
(2) with the rotor (4) and a second joining of the centre of the rotor (4) with the
second opening (22b) for outlet of the air from the air conveying channel (22), defines
an angle beta (β) whose value is between 20° and 90°, included.
1. Geschmierte Vakuumpumpe, umfassend ein Statorgehäuse (2), aufweisend eine Unterteilung
(3) zur Unterbringung eines Rotors (4), außermittig positioniert in der Unterteilung
(2), um eine Saugkammer (5) zu definieren, wobei die Pumpe (1) eine Leitung (6) aufweist,
um ein gasförmiges Fluid zuzuführen, sowie eine oder mehrere Leitungen (7), um eine
Dispersion eines Schmierfluids in das gasförmige Fluid abzulassen,
wobei ein Saugventil (10), das entlang der Zuführleitung (6) positioniert ist, ausgelegt
ist, um von einer offenen Position in eine geschlossene Position und umgekehrt zu
wechseln und den Durchfluss des gasförmigen Fluids in der Saugkammer (5) zu regeln,
wobei die Pumpe (1) eine Kammer umfasst, um eine Schmierflüssigkeit (11) in Fluidkommunikation
mit der einen oder den mehreren Ablassleitungen (7) zu enthalten, die eine Trennwand
(12) aufweist, die eine Unterteilung (13) zum Enthalten der Schmierflüssigkeit abgrenzt,
in die die eine oder die mehreren Ablassleitungen (7) führen, und einen Behälter (14)
zum Sammeln der überschüssigen Schmierflüssigkeit, das in der Enthalteunterteilung
(13) enthalten ist,
wobei die Unterteilung (13) zum Enthalten des Schmierfluids mittels der einen oder
der mehreren Ablassleitungen (7) in Fluidkommunikation mit der Saugkammer (5) ist,
wobei mindestens ein Ablassventil (16), das ausgelegt ist, um von einer offenen Position
in eine geschlossene Position und umgekehrt zu wechseln, den Durchfluss der Dispersion
von Schmierfluid im gasförmigen Fluid von einer jeweiligen Ablassleitung (7) zur Unterteilung
(13) zum Enthalten des Schmierfluids regelt,
wobei die Pumpe mindestens eine Leitung (17) umfasst, um die Kammer zum Enthalten
der Schmierflüssigkeit (11) mit der Saugkammer (5) zu verbinden, wobei sich die Verbindungsleitung
(17) mindestens teilweise in der Trennwand (12) der Kammer zum Enthalten der Schmierflüssigkeit
(11) erstreckt und in die Saugkammer (5) führt,
wobei sich die Verbindungsleitung (17) mindestens teilweise in der Trennwand (12)
der Kammer zum Enthalten des Schmierfluids (11) und mindestens teilweise im Statorgehäuse
(2) der Pumpe (1) erstreckt, wobei die Verbindungsleitung (17) eine jeweilige erste
Öffnung (17a) in Fluidkommunikation mit der Kammer zum Enthalten der Schmierflüssigkeit
(11) aufweist, die von der Trennwand (12) führt,
dadurch gekennzeichnet, dass die Trennwand (12) eine erste und eine zweite Seitenoberfläche (20, 21) aufweist,
jeweils begrenzend die Enthalteunterteilung (13) und den Behälter (14) zum Sammeln
der überschüssigen Schmierflüssigkeit, und eine oberseitige Oberfläche (18), angrenzend
an die erste und zweite Seitenoberfläche (20, 21) der Trennwand (12), wobei die erste
Öffnung (17a) der Verbindungsleitung (17) an der oberseitigen Oberfläche (18) der
Trennwand (12) positioniert ist.
2. Pumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Verbindungsleitung (17) eine jeweilige zweite Öffnung (17b) in Fluidkommunikation
mit der Saugkammer (5) aufweist.
3. Pumpe nach Anspruch 2, dadurch gekennzeichnet, dass die zweite Öffnung (17b) in der Nähe einer jeweiligen Ablassleitung (7) positioniert
ist.
4. Pumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie Mittel (19) zum Regeln des Fluiddurchflusses umfasst, die entlang der jeweiligen
Verbindungsleitung (17) positioniert sind.
5. Pumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie mindestens einen Kanal zum Fördern von Luft (22) umfasst, aufweisend eine erste
Öffnung (22a) zum Einlassen der Luft in Fluidkommunikation mit der Kammer zum Enthalten
von Schmierflüssigkeit (11) in einer Luftzone (15) und eine zweite Öffnung (22b) zum
Auslassen der Luft, die in die Saugkammer (5) führt.
6. Pumpe nach Anspruch 5, dadurch gekennzeichnet, dass sie Mittel (23) zum Regeln des Luftstroms umfasst, die entlang des jeweiligen Kanals
zum Fördern von Luft (22) positioniert sind, die vorzugsweise in der Nähe der ersten
Öffnung (22a) für das Einlassen der Luft positioniert sind.
7. Pumpe nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass sich ein Luftförderkanal (22) mindestens teilweise im Statorgehäuse (2) erstreckt.
8. Pumpe nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, dass die zweite Öffnung (22b) zum Auslassen der Luft des Luftförderkanals (22) in der
Nähe einer jeweiligen Ablassleitung (7) positioniert ist, wobei ein erstes Zusammenfügen
der Mitte des Rotors (4) mit dem Punkt der maximalen Nähe des Statorgehäuses (2) mit
dem Rotor (4) und ein zweites Zusammenfügen der Mitte des Rotors (4) mit der zweiten
Öffnung (22b) zum Auslassen der Luft aus dem Luftförderkanal (22) einen Betawinkel
(β) definiert, dessen Wert zwischen 20° und 90° einschließlich beträgt.
1. Pompe à vide lubrifiée comprenant un corps de stator (2) comportant un compartiment
(3) pour loger un rotor (4) positionné de manière excentrique à l'intérieur du compartiment
(2) pour définir une chambre d'aspiration (5) ;
la pompe (1) comporte un conduit (6) pour l'alimentation d'un fluide gazeux et un
ou plusieurs conduits (7) pour évacuer une dispersion d'un fluide de lubrification
dans le fluide gazeux;
une soupape d'aspiration (10), positionnée le long du conduit d'alimentation (6),
est configurée pour passer d'une position d'ouverture à une position de fermeture
et vice versa, en réglant le passage du fluide gazeux dans la chambre d'aspiration
(5);
la pompe (1) comprend une chambre, destinée à contenir le liquide de lubrification
(11), en communication fluidique avec un ou plusieurs conduits d'évacuation (7), comportant
une paroi de séparation (12) qui délimite un compartiment (13) destiné à contenir
le liquide de lubrification, dans lequel débouchent un ou plusieurs conduits d'évacuation
(7), et un réservoir (14) destiné à recueillir l'excès de liquide de lubrification
contenu dans le compartiment de contenance (13);
le compartiment (13) destiné à contenir le fluide de lubrification étant en communication
fluidique avec la chambre d'aspiration (5) au moyen d'un ou plusieurs conduits d'évacuation
(7);
au moins une soupape de décharge (16), configurée pour passer d'une position d'ouverture
à une position de fermeture et vice versa, règle le passage de la dispersion du fluide
de lubrification dans le fluide gazeux à partir d'un conduit d'évacuation (7) respectif
vers le compartiment (13) destiné à contenir le fluide de lubrification;
la pompe comprend au moins un conduit (17) pour relier la chambre destinée à contenir
le liquide de lubrification (11) à la chambre d'aspiration (5); le conduit de raccordement
(17) se prolongeant au moins partiellement dans la paroi de séparation (12) de la
chambre destinée à contenir le liquide de lubrification (11) et conduisant à l'intérieur
de la chambre d'aspiration (5);
le conduit de raccordement (17) se prolonge au moins partiellement dans la paroi de
séparation (12) de la chambre destinée à contenir le fluide de lubrification (11)
et au moins partiellement dans le corps de stator (2) de la pompe (1) ;
le conduit de raccordement (17) comporte une première ouverture (17a) respective,
en communication fluidique avec la chambre destinée à contenir le liquide de lubrification
(11), partant de la paroi de séparation (12) ;
caractérisée en ce que la paroi de séparation (12) comporte une première et une seconde surface latérale
(20, 21), délimitant respectivement le compartiment de contenance (13) et le réservoir
(14) pour collecter le liquide de lubrification en excès, et une surface supérieure
(18) adjacente aux première et seconde surfaces latérales (20, 21) de la paroi de
séparation (12); la première ouverture (17a) du conduit de raccordement (17) est positionnée
en correspondance de la surface supérieure (18) de la paroi de séparation (12) .
2. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce que le conduit de raccordement (17) comporte une seconde ouverture (17b) respective en
communication fluidique avec la chambre d'aspiration (5).
3. Pompe selon la revendication 2, caractérisée en ce que la seconde ouverture (17b) est positionnée à proximité d'un conduit d'évacuation
(7) respectif.
4. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle comprend des moyens (19), pour régler le débit de fluide, positionnés le long
du conduit de raccordement (17) respectif.
5. Pompe selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle comprend au moins un canal, servant à acheminer l'air (22), comportant une première
ouverture (22a) pour l'entrée de l'air en communication fluidique avec la chambre
destinée à contenir un liquide de lubrification (11) dans une zone d'air (15) et une
seconde ouverture (22b) pour la sortie de l'air conduisant dans la chambre d'aspiration
(5).
6. Pompe selon la revendication 5, caractérisée en ce qu'elle comprend des moyens (23), pour régler le débit d'air, positionnés le long du
canal respectif destiné à acheminer l'air (22), de préférence à proximité de la première
ouverture (22a) pour l'entrée de l'air.
7. Pompe selon la revendication 5 ou 6, caractérisée en ce qu'un canal d'acheminement d'air (22) se prolonge au moins partiellement dans le corps
de stator (2).
8. Pompe selon l'une quelconque des revendications 5 à 7, caractérisée en ce que la seconde ouverture (22b), pour la sortie de l'air du canal d'acheminement d'air
(22), est positionnée à proximité d'un conduit d'évacuation (7) respectif; une première
jonction du centre du rotor (4) avec le point de proximité maximale du corps de stator
(2) avec le rotor (4) et une seconde jonction du centre du rotor (4) avec la seconde
ouverture (22b) pour la sortie de l'air du canal d'acheminement d'air (22), définissent
un angle bêta (β) dont la valeur est comprise entre 20 et 90° inclus.