EP3470678A1 - Lubricated vacuum pump - Google Patents
Lubricated vacuum pump Download PDFInfo
- Publication number
- EP3470678A1 EP3470678A1 EP18199571.3A EP18199571A EP3470678A1 EP 3470678 A1 EP3470678 A1 EP 3470678A1 EP 18199571 A EP18199571 A EP 18199571A EP 3470678 A1 EP3470678 A1 EP 3470678A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chamber
- duct
- air
- fluid
- compartment
- 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.)
- Granted
Links
- 230000001050 lubricating effect Effects 0.000 claims abstract description 63
- 239000012530 fluid Substances 0.000 claims abstract description 60
- 239000007788 liquid Substances 0.000 claims abstract description 37
- 239000006185 dispersion Substances 0.000 claims abstract description 11
- 238000007599 discharging Methods 0.000 claims description 11
- 239000003921 oil Substances 0.000 description 7
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- -1 for example Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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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
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
- F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
-
- 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
- F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
- F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
-
- 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
- F04C28/06—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for stopping, starting, idling or no-load operation
-
- 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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/028—Means for improving or restricting lubricant flow
-
- 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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
- F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
-
- 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
- F04C28/28—Safety arrangements; Monitoring
Definitions
- This invention relates to a lubricated vacuum pump.
- the lubricated vacuum pump addresses the technical field of lubricated vacuum pumps of a rotary type, such as, for example, pumps with blades.
- a lubricated vacuum pump with blades it comprises a stator body having a compartment for housing a rotor.
- 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.
- 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.
- a suction valve 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.
- 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.
- the discharge channel of the suction chamber leads to a chamber for containing lubricating oil.
- a discharge valve 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.
- 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.
- 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.
- the pressure of the suction chamber is greater than the pressure upstream of the suction valve, causing its closure.
- 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.
- 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.
- 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.
- 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.
- 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.
- the compartment for containing the lubricating fluid being in fluid communication with the suction chamber by means of the one or more discharging ducts.
- 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.
- 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.
- the numeral 1 indicates a lubricated vacuum pump according to the invention.
- 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.
- the pump 1 has a supply duct 6 and one or more discharge ducts 7.
- 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.
- 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.
- the pump 1 comprises a suction valve 10 positioned along the supply duct 6.
- 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.
- the gaseous fluid is a compressible fluid, such as, for example, air or other gases.
- 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.
- the suction valve 10 may be a spring type plate valve or a pneumatic or electric valve.
- 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.
- the pump 1 comprises a chamber for containing lubricating liquid 11, in fluid communication with the one or more discharge ducts 7.
- 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.
- lubricating liquid means a lubricating substance, such as, for example, oil, of a mineral and/or silicone and/or synthetic origin.
- 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.
- the dividing wall 12 has a top surface 18.
- the top surface 18 is a surface facing towards the volume of air of the chamber for containing lubricating liquid 11.
- 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.
- the first side surface 20 of the dividing wall 12 defines one of the side walls of the containment compartment 13.
- the second side surface 21 of the dividing wall 12 defines one of the side walls of the collecting tank 14.
- the top surface 18 is contiguous with the first and second side surface 20 and 21 of the dividing wall 12.
- 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.
- 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.
- the pump 1 has at least one duct 17 for connecting the chamber for containing the lubricating fluid 11 with the suction chamber 5.
- 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.
- 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 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.
- the second opening 17b is positioned inside the suction chamber 5 in the vicinity of the discharge duct 7.
- 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.
- Means 19 for adjusting the fluid flow rate are positioned along the respective connecting duct 17.
- the adjusting means 19 are in the form of a nozzle.
- 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.
- the discharge valve 16 operates in a bath of lubricating liquid in the containment compartment 13.
- 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.
- 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 .
- the lubricating liquid prevents the entry of air in the suction chamber 5.
- the lubricating liquid contained in the connecting duct 17 is drawn inside the suction compartment 5, thus emptying the channel 17.
- the air can flow inside the connection duct 17 in the suction chamber 5, through the second opening 17b, as illustrated in Figure 2 .
- 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.
- connection duct 17 makes it possible to adjust the flow rate of liquid lubricant and air which are introduced into the suction chamber 5 through the channel 17.
- the pump 1 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.
- the air conveying channel 22 extends at least partly in the stator body 2.
- 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.
- beta " ⁇ " 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.
- the adjusting means 23 are in the form of a nozzle.
- the adjusting means 23 guarantee a constant and predictable air flow rate.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
Description
- This invention relates to a lubricated vacuum pump.
- 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.
- 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.
- 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.
- 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.
- 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.
- In a lubricated pump, the discharge channel of the suction chamber leads to a chamber for containing lubricating oil.
- 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.
- Patent document
GB1556643 - 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.
- 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.
- In this way, the pressure of the suction chamber is greater than the pressure upstream of the suction valve, causing its closure.
- 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. - 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- The compartment for containing the lubricating fluid being in fluid communication with the suction chamber by means of the one or more discharging ducts.
- 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.
- 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. 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 ofFigure 1 during a switched OFF or failed condition. - The
numeral 1 indicates a lubricated vacuum pump according to the invention. - The
pump 1 comprises astator body 2 comprising acompartment 3 for housing arotor 4 positioned eccentrically in thecompartment 3 to define asuction chamber 5. - The
pump 1 has asupply duct 6 and one ormore discharge ducts 7. - The
rotor 4, in the embodiment illustrated, has a plurality ofseats 8 for housingrespective blades 9, each slidable in therespective housing seat 8. - During the operation of the pump, the
rotor 4 rotates about its axis ofrotation 4a, and theblades 9 move to a position furthest away from theaxis 4a of rotation of therotor 4, pressing against the walls of thecompartment 3 of thestator body 2. - The
pump 1 comprises asuction valve 10 positioned along thesupply duct 6. - 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 thesuction chamber 5. - The gaseous fluid is a compressible fluid, such as, for example, air or other gases.
- During normal operation of the
pump 1, thesuction valve 10 is open to ensure flow of the gaseous fluid into thesuction chamber 5 of thepump 1. In the event of a switching off or fault of thepump 1, thesuction valve 10 passes from the open condition to the closed condition of thesupply duct 6. - The
suction valve 10 may be a spring type plate valve or a pneumatic or electric valve. - The
pump 1 illustrated has a plurality ofdischarge ducts 7, with reference to a direction of extension of the pump parallel to the axis ofrotation 4a of therotor 4. - The
pump 1 comprises a chamber for containing lubricatingliquid 11, in fluid communication with the one ormore discharge ducts 7. - The chamber for containing lubricating
liquid 11 has a dividingwall 12 which delimits acompartment 13 for containing the lubricating liquid, into which lead the one or moredischarging ducts 7, and atank 14 for collecting the excess lubricating liquid contained in thecontainment compartment 13. - The term lubricating liquid means a lubricating substance, such as, for example, oil, of a mineral and/or silicone and/or synthetic origin.
- The chamber for containing lubricating
liquid 11 has anair zone 15 defined by the volume of air above the surface of the liquid lubricant contained therein. - The dividing
wall 12 has atop surface 18. - The
top surface 18 is a surface facing towards the volume of air of the chamber for containing lubricatingliquid 11. - The dividing
wall 12 has a first and asecond side surface containment compartment 13 and thetank 14 for collecting the excess lubricating fluid contained in thecontainment compartment 13. - The
first side surface 20 of the dividingwall 12 defines one of the side walls of thecontainment compartment 13. - The
second side surface 21 of the dividingwall 12 defines one of the side walls of the collectingtank 14. - The
top surface 18 is contiguous with the first andsecond side surface wall 12. - The
pump 1 comprises adischarge 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 arespective discharge duct 7 to thecompartment 13 for containing the lubricating fluid. Eachdischarge duct 7 has a respective inlet opening 7a, in fluid communication with thesuction chamber 5, and a respective outlet opening 7b, in fluid communication with thecontainment compartment 13 of the lubricating fluid. - The
discharge valve 16 is located facing therespective outlet mouth 7b. According to the preferred variant embodiment, thedischarge valve 16 is a flexible valve of a laminar type. - According to the invention, the
pump 1 has at least oneduct 17 for connecting the chamber for containing thelubricating fluid 11 with thesuction chamber 5. - The connecting
duct 17 extends at least partly in the dividingwall 12 of the chamber for containing the lubricatingliquid 11 and leads inside thesuction chamber 5. - The connecting
duct 17 extends at least partly in the dividingwall 12 of the chamber for containing thelubricating fluid 11 and at least partly in thestator body 2 of thepump 1. - More specifically, the connecting
duct 17 has a first opening 17a in fluid communication with chamber for containing lubricatingliquid 11 and a second opening 17b in fluid communication with thesuction chamber 5. The first opening 17a is positioned at thetop surface 18 of the dividingwall 12. - The second opening 17b is positioned inside the
suction chamber 5 in the vicinity of thedischarge duct 7. - More specifically, defining as alpha "a" an angle defined by a first joining of the centre of the
rotor 4 with the point of maximum vicinity of thestator body 2 with therotor 4 and a second joining of the centre of therotor 4 with the second opening 17b of thedischarge duct 7, the value of the angle alpha is between 20° and 60°, included. According to an embodiment, thepump 1 can have a plurality of connectingconduits 17, with reference to a direction of extension of thepump 1 parallel to the axis ofrotation 4a of therotor 4, each having a respectivefirst opening 17a, positioned at thetop surface 18 of the dividingwall 12, and a respective second opening 17b, leading inside thesuction chamber 5. - Means 19 for adjusting the fluid flow rate are positioned along the respective connecting
duct 17. - The adjusting means 19 according to preferred variant embodiment are in the form of a nozzle.
- Under normal operating conditions of the
pump 1, by means of the rotation of therotor 4, a dispersion of lubricating fluid in the gaseous fluid is expelled from thesuction chamber 5 through thedischarge duct 7. - The overpressure between the inlet opening 7a of the
discharge channels 7 and thecontainment compartment 13 of the lubricating fluid keeps thedischarge valve 16 open. - In this operating condition, the
containment compartment 13 fills completely with lubricating liquid and the excess flows into thecollection tank 14 thereby defining a film of lubricating fluid on thetop surface 18 of the dividingwall 12 of thecontainment compartment 13 and of thetank 14 for collecting the excess lubricating liquid. - The
discharge valve 16 operates in a bath of lubricating liquid in thecontainment compartment 13. - Under normal operating conditions of the
pump 1, the connectingduct 17 is filled with the lubricant which derives from the inside of thesuction chamber 5 and by at least part of the excess of thecontainment compartment 13. - 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 dividingwall 12, as shown inFigure 1 . - This condition continues since, with each rotation of the
rotor 4 about itsaxis 4a, a dispersion of lubricating fluid in the gaseous fluid is continually expelled in thecontainment compartment 13 and the excess of lubricating liquid which flows from thecompartment 13 into thecollection tank 14 guarantees the presence of the lubricating liquid film on the top surface of the dividingwall 12. - In this way, the lubricating liquid prevents the entry of air in the
suction chamber 5. - 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 thesuction chamber 5 in thecontainment compartment 13 decreases until stopping in relation to the rotation of therotor 4 about therelative axis 4a. - In this condition, the
discharge valve 16 passes from the open position to the closed position of thedischarge opening 7b of thedischarge duct 7. - 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 thecontainment compartment 13 stops. The lubricating liquid contained in the connectingduct 17 is drawn inside thesuction compartment 5, thus emptying thechannel 17. - Since the
first opening 17a of the connectingduct 17 is in communication with theair zone 15 the chamber for containing the lubricatingfluid 11, as it no longer occluded by the film of lubricating liquid, the air can flow inside theconnection duct 17 in thesuction chamber 5, through thesecond opening 17b, as illustrated inFigure 2 . - The overpressure created in the
suction chamber 5, defined by the air introduced by the connecting conduit, allows thesuction valve 10 to be changed from the open position to the closed position. - Advantageously, the presence of the
means 19 for adjusting the flow rate inside theconnection duct 17 make it possible to adjust the flow rate of liquid lubricant and air which are introduced into thesuction chamber 5 through thechannel 17. - 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 afirst opening 22a for inlet of the air in fluid communication with the chamber for containing lubricating liquid 11 in anair zone 15 and asecond opening 22b for outlet of the air leading into thesuction chamber 5. - The
air conveying channel 22 extends at least partly in thestator body 2. Thesecond opening 22b for outlet of the air from theair conveying channel 22 is positioned in the vicinity of thedischarge duct 7. - 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 thestator body 2 with therotor 4 and a second joining of the centre of therotor 4 with thesecond opening 22b for outlet of the from theair 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 conveyingair 22, preferably being positioned close to thefirst opening 22a for inlet of the air. - Preferably, the adjusting means 23 are in the form of a nozzle. Advantageously, the adjusting means 23 guarantee a constant and predictable air flow rate.
Claims (11)
- 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 being characterised in that it 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 pump according to independent claim 1, characterised in that 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 pump according to independent claim 1 or 2, characterised in that 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).
- The pump according to claim 3, 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).
- 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).
- The pump according to claim 5, characterised in that the second opening (17b) is positioned close to a respective discharge duct (7); more specifically, 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), forms an angle alpha (α) whose value is between 20° and 60°,
- 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).
- 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).
- The pump according to claim 8, 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.
- The pump according to claim 8 or 9, characterised in that an air conveying channel (22) extends at least partly in the stator body (2).
- The pump according to any one of claims 8 to 10, characterised in that the second opening (22b) for outlet of the air of the air conveying channel (22) is positioned close to 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.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102017000115881A IT201700115881A1 (en) | 2017-10-13 | 2017-10-13 | PUMP FOR LUBRICATED VACUUM |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3470678A1 true EP3470678A1 (en) | 2019-04-17 |
EP3470678B1 EP3470678B1 (en) | 2020-06-24 |
Family
ID=61187702
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18199571.3A Active EP3470678B1 (en) | 2017-10-13 | 2018-10-10 | Lubricated vacuum pump |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3470678B1 (en) |
IT (1) | IT201700115881A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3657019A1 (en) * | 2019-11-07 | 2020-05-27 | Pfeiffer Vacuum Gmbh | Vacuum pump and method for controlling the deactivation of same |
EP3636879B1 (en) | 2019-11-20 | 2022-01-05 | Pfeiffer Vacuum Gmbh | Vacuum pump |
JP7052101B1 (en) * | 2021-01-27 | 2022-04-11 | 株式会社アルバック | Vacuum pump and vacuum pump decompression method |
WO2024078678A1 (en) | 2022-10-10 | 2024-04-18 | Busch Produktions Gmbh | Improved sliding vane rotary pump |
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DE1403069B1 (en) * | 1959-06-19 | 1970-01-29 | Leybold Heraeus Gmbh & Co Kg | Liquid-sealed rotating mechanical vacuum pump |
GB1556643A (en) | 1977-03-08 | 1979-11-28 | Leybold Heraeus Sogev | Oil sealed vacuum pump |
DE202012002883U1 (en) * | 2012-03-22 | 2013-06-25 | Oerlikon Leybold Vacuum Gmbh | Rotary vacuum pump |
US20130251578A1 (en) | 2005-07-07 | 2013-09-26 | Oerlikon Leybold Vacuum Gmbh | Rotary vacuum pump with a discharge compensating channel |
-
2017
- 2017-10-13 IT IT102017000115881A patent/IT201700115881A1/en unknown
-
2018
- 2018-10-10 EP EP18199571.3A patent/EP3470678B1/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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DE1403069B1 (en) * | 1959-06-19 | 1970-01-29 | Leybold Heraeus Gmbh & Co Kg | Liquid-sealed rotating mechanical vacuum pump |
GB1556643A (en) | 1977-03-08 | 1979-11-28 | Leybold Heraeus Sogev | Oil sealed vacuum pump |
US20130251578A1 (en) | 2005-07-07 | 2013-09-26 | Oerlikon Leybold Vacuum Gmbh | Rotary vacuum pump with a discharge compensating channel |
DE202012002883U1 (en) * | 2012-03-22 | 2013-06-25 | Oerlikon Leybold Vacuum Gmbh | Rotary vacuum pump |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3657019A1 (en) * | 2019-11-07 | 2020-05-27 | Pfeiffer Vacuum Gmbh | Vacuum pump and method for controlling the deactivation of same |
EP3636879B1 (en) | 2019-11-20 | 2022-01-05 | Pfeiffer Vacuum Gmbh | Vacuum pump |
JP7052101B1 (en) * | 2021-01-27 | 2022-04-11 | 株式会社アルバック | Vacuum pump and vacuum pump decompression method |
WO2024078678A1 (en) | 2022-10-10 | 2024-04-18 | Busch Produktions Gmbh | Improved sliding vane rotary pump |
Also Published As
Publication number | Publication date |
---|---|
IT201700115881A1 (en) | 2019-04-13 |
EP3470678B1 (en) | 2020-06-24 |
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