EP3775558A1 - Pompe à vide de type sèche - Google Patents
Pompe à vide de type sècheInfo
- Publication number
- EP3775558A1 EP3775558A1 EP19712244.3A EP19712244A EP3775558A1 EP 3775558 A1 EP3775558 A1 EP 3775558A1 EP 19712244 A EP19712244 A EP 19712244A EP 3775558 A1 EP3775558 A1 EP 3775558A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- vacuum pump
- oil sump
- pumping
- pump
- volume
- 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
- 238000005086 pumping Methods 0.000 claims abstract description 87
- 238000007789 sealing Methods 0.000 claims abstract description 44
- 239000000314 lubricant Substances 0.000 claims abstract description 16
- 239000012528 membrane Substances 0.000 claims description 53
- 239000007789 gas Substances 0.000 claims description 23
- 230000001681 protective effect Effects 0.000 claims description 9
- 239000013536 elastomeric material Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 abstract 1
- 238000010079 rubber tapping Methods 0.000 description 13
- 239000004519 grease Substances 0.000 description 6
- 229920000459 Nitrile rubber Polymers 0.000 description 4
- 210000000078 claw Anatomy 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 210000003027 ear inner Anatomy 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 229920002449 FKM Polymers 0.000 description 2
- NTXGQCSETZTARF-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile Chemical compound C=CC=C.C=CC#N NTXGQCSETZTARF-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000011253 protective coating Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 1
- 244000046052 Phaseolus vulgaris Species 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 210000003323 beak Anatomy 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- 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
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
-
- 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
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/126—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type
-
- 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
- F04C2220/00—Application
- F04C2220/10—Vacuum
- F04C2220/12—Dry running
-
- 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
- F04C2240/00—Components
- F04C2240/80—Other components
- F04C2240/809—Lubricant sump
-
- 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
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/21—Pressure difference
-
- 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
- F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
- F04C27/008—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
- F04C27/009—Shaft sealings specially adapted for 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
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2210/00—Working fluid
- F05B2210/10—Kind or type
- F05B2210/12—Kind or type gaseous, i.e. compressible
Definitions
- the present invention relates to a dry type vacuum pump such as "Roots" or “Claw” or screw type.
- the invention relates more particularly to the lubricant seal of the vacuum pump.
- the dry type dry vacuum pumps comprise one or more pump stages in series in which a gas to be pumped between a suction and a discharge flows.
- known primary vacuum pumps those with rotary lobes also known under the name “Roots” or those with beaks, also known under the name “Claw” or those with screw.
- Roots type vacuum pumps or “Roots Blower” in English
- These vacuum pumps are called “dry” because in operation, the rotors rotate inside the stator without any mechanical contact between them or with the stator or presence of oil-type lubricant in the pump stages.
- Rotating shafts are supported by bearings that are lubricated with oil or grease and by gears for synchronization. It is essential that no trace of oil or grease is found in the pumping stage for so-called “dry” applications, such as the manufacturing processes of semiconductor substrates. It is therefore appropriate to isolate any zone containing lubricants (hereinafter referred to as "oil sump") from the dry pumping portion by a sealing means through which the shafts are always rotatable.
- oil sump any zone containing lubricants
- the sealing means used mainly comprise physical barriers such as bearing flanges, rubbing seals, ejector discs, gas purges, oil traps such as expansion and condensation chambers or obstacles such as labyrinths and baffles. .
- These solutions mainly try to block or limit oil migrations.
- the pressures used in the vacuum pumps can fluctuate significantly and generate driving forces between the lubricated bearings and the pumping stages may cause polluting particles to the oil sump or mists or oil or grease vapors to the pumping stage.
- the object of the present invention is therefore to provide a dry vacuum pump whose lubrication seal is improved between the pumping stage and the oil sump compared to the state of the art.
- the subject of the invention is a dry type vacuum pump comprising:
- At least one lubricant sealing device interposed between the at least one oil sump and a pumping stage at each shaft passage
- the vacuum pump further comprises at least one expansion device configured to reduce pressure variations between a pump-side volume and the at least one oil pan.
- the vacuum pump is for example a rotary lobe vacuum pump, such as "Roots” type, primary or “blower” type (also called Roots compressor), or such as "Claw” type or screw type.
- the vacuum pump may have a single oil sump.
- This oil sump can be arranged next to the so-called low pressure pumping stage or next to the so-called high pressure pumping stage in the case of a multi-stage vacuum pump.
- the bearings can be lubricated with grease.
- the vacuum vacuum pump may also include two oil pans. These oil pans are arranged at a respective end of the vacuum pump, that is to say on the one hand, next to the so-called high pressure stage and next to the so-called low pressure stage. in the case of a multi-stage vacuum pump. In the case of a single-stage vacuum pump, such as a Roots compressor-type vacuum pump (called “Roots Blower”), the oil pans are arranged on either side of the single stage. pumping.
- Roots Blower Roots compressor-type vacuum pump
- the sealing devices create a very low conductance around the rotary shafts to greatly limit the passage of lubricating fluids from the oil sump to the at least one dry pumping stage while allowing the shafts to rotate.
- the sealing device comprises for example a seal, which may be for example a labyrinth seal, a so-called lip seal or a baffle or a combination of these embodiments.
- the vacuum pump comprises for example at least first and second sealing devices, such as friction seals arranged in series on each shaft between the oil sump and the pumping stage.
- the pressure in the oil sump is for example the atmospheric pressure.
- the oil sump may or may not communicate with the outside atmosphere for example via an opening or may be hermetically sealed vis-à-vis the outside atmosphere.
- Said pumping stage is for example configured to discharge the pumped gases at atmospheric pressure.
- said pumping stage can also be the first pumping stage (called "low pressure" stage)
- the expansion device comprises for example at least one deformable and gas-tight membrane.
- the expansion device comprises for example a single membrane for a shaft passage or a plurality of membranes arranged in parallel.
- the shape and the material of the membrane can be to be considered according to the volumes to be varied on both sides of the membrane during the different phases of pumping, the temperatures and operations of the vacuum pump as well as the available space.
- the at least one membrane is for example elastomeric material, such as "NBR” (or “butadiene-acrylonitrile copolymer”) or viton® (or “fluorocarbon rubber”). These materials make it possible to produce the desired volume deformations, are sealed for the considered pressures, withstand pumped gases and high temperatures and resist a large number of deformations without loss of performance.
- the membrane may comprise protective coatings, inserts and / or impregnated reinforcing webs such as woven and knitted webs to prevent tearing of the membrane.
- the at least one membrane has for example in the rest position a general form of disc or cup.
- the at least one membrane is for example mounted in a rigid protective shell.
- the expansion device is interposed between, on the one hand, the volume on the pumping side and, on the other hand, the volume of the oil sump.
- the pumping side volume is located between the at least one sealing device and the pumping stage.
- the pumping-side volume is located between the at least one sealing device and an outlet of the pumping stage located after the rotors, considering the direction of flow of the gases pumped into the vacuum pump. and considering that the oil sump is located on the discharge side of the vacuum pump.
- the pumping side and oil sump volumes can vary by expansion when pressure deviations occur on either side of the expansion device. These variations in volume make it possible to balance the pressures between the pumping stage and the oil sump.
- the pumping stage adjoining the oil sump is configured to discharge the pumped gases at atmospheric pressure.
- the vacuum pump is therefore a primary vacuum pump.
- the pressure in the sump is the atmospheric pressure.
- the expansion device separates the pumping-side volume from the outside atmosphere.
- the volume pumping side is interposed between an output of the pumping stage and the at least one sealing device.
- the output of the pumping stage is located after the rotors by considering the direction of flow of the gases pumped into the vacuum pump.
- the pumping side volume can vary when pressure differences occur between the pumping side volume and the outside atmosphere, thereby balancing the outlet pressure of the pumping stage with atmospheric pressure and thus with the pressure prevailing in the sump.
- the expansion device separates the volume of the oil sump from a pump-side volume interposed between a first and a second sealing device arranged in series on each shaft.
- variations in pumping side and oil sump volumes serve to balance the pressures between the pumping side volume interposed between the seals and the sump.
- the pressure variations that may occur at the outlet of the pumping stage are only slightly transmitted to the pumping side and oil sump volumes. Possible reversals of the pressure differences between the pumping side volume and the oil pan volume are avoided.
- the expansion device separates the volume pumping side interposed between first and second sealing devices arranged in series on each shaft, the outer atmosphere.
- the pumping side volume interposed between the two sealing devices can vary as pressure deviations occur between the pumping side volume and the outside atmosphere, thereby balancing the pumping side volume pressure with the pumping volume. the atmospheric pressure and so with the pressure in the sump.
- Figure 1 shows a very schematic view of a vacuum pump according to a first embodiment.
- Figure 2 shows a sectional view of a detail of the vacuum pump of Figure 1.
- Figure 3 shows a perspective view of a membrane of an expansion device according to a first embodiment.
- Figure 4 shows a sectional view of a rigid protective shell for the membrane of Figure 3.
- FIG. 5 is a graph showing the pressure (in mbar) prevailing at the outlet of the pumping stage (curve A) and the pressure (in mbar) prevailing in the oil sump (curve B) for a vacuum pump of the prior art as a function of time (in seconds) and for different pressures (in mbar) suction.
- FIG. 6 is a graph showing the pressure (in mbar) at the outlet of the pumping stage (curve A) and the pressure (in mbar) prevailing in the oil sump (curve B) for a vacuum pump according to FIG. first embodiment of the invention as a function of time (in seconds) and for different suction pressures.
- Figure 7 shows a very schematic view of a vacuum pump according to a second embodiment.
- Figure 8 shows a sectional view of a detail of the vacuum pump of Figure 7.
- Figure 9 shows a very schematic view of a vacuum pump according to a third embodiment.
- Figure 10 shows a sectional view of a detail of the vacuum pump of Figure 9.
- FIG. 11 is a graph showing the pressure (in mbar) at the outlet of the pumping stage (curve A), the pressure (in mbar) prevailing in the oil sump (curve B) and the pressure (in mbar) in the pump-side volume located between two lubricant-sealing devices (curve C) for a vacuum pump according to a third embodiment of the invention, as a function of time (in seconds) and for different suction pressures .
- Figure 12 shows a sectional view of a detail of a vacuum pump according to a fourth embodiment.
- Figure 1 shows a vacuum pump 1 of the dry type according to a first embodiment.
- the vacuum pump 1 comprises at least one oil sump 2, two rotary shafts 4 and at least one first sealing device 6a, 6b to the lubricants interposed between the at least one oil sump 2 and a pump stage 3 at the shaft passages between the at least one oil pan 2 and the pump stage 3e.
- the shafts 4 carry respectively at least one rotor 5 extending in the pumping stage 3e in order to entrain a gas to be pumped between a suction 7 and a discharge 8 of the vacuum pump 1.
- the vacuum pump 1 comprises several pumping stages 3a, 3b, 3c, 3d, 3e, such as five, connected in series between the suction 7 and the discharge 8 and in which a gas to be pumped can circulate.
- the pumping stage 3e adjacent to the sealing device 6a, 6b may be one of the two end pumping stages of the vacuum pump 1, that is to say the first pumping stage 3a (called low pressure ”) or the last 3rd (so-called" high pressure ”) pumping stage configured to discharge the pumped gases at atmospheric pressure.
- the 3rd pump stage considered is the one configured to discharge the pumped gases at atmospheric pressure.
- Each pumping stage 3a, 3b, 3c, 3d, 3e comprises a respective input and a respective output.
- the successive pump stages 3a-3 are connected in series one after the other by respective inter-stage channels connecting the output of the preceding pump stage to the input of the next stage.
- the rotors 5 have, for example, lobes of identical profiles, for example of the "Roots” type ("eight" or “bean” shaped section) or of the "Claw” type, or are of the screw type or of another type. similar principle of volumetric vacuum pump.
- the rotors 5, in particular with lobes of identical profiles, are angularly offset and driven to rotate synchronously in opposite directions in each stage. During the rotation, the gas sucked from the inlet is trapped in the volume generated by the rotors and the stator, then is driven by the rotors to the next stage.
- the vacuum pump 1 is for example a primary vacuum pump, the discharge pressure of the vacuum pump 1 then being the atmospheric pressure.
- the vacuum pump 1 is a Roots pump called “Roots Blower” which is used in series and upstream of a primary vacuum pump.
- the vacuum pump 1 may further comprise a non-return valve 23 (see Figure 2) at the outlet of the last pump stage 3, before the discharge 8, to prevent the return of the pumped gases in the pump stage 3.
- the shafts 4 are driven, for example on the discharge side 8, by a motor M of the vacuum pump 1. They are supported by bearings lubricated by a lubricant contained in the oil sump 2. As can be seen more specifically in FIG. 2, the lubricant, such as grease or oil, makes it possible to lubricate in particular the bearings 9 of the bearings and the gears 10.
- the pressure in the oil sump 2 is for example the atmospheric pressure.
- the oil sump 2 may or may not communicate with the outside atmosphere.
- the sealing device 6a, 6b creates a very weak conductance around the rotary shafts 4 to greatly limit the passage of lubricating fluids from the casing 2 to the dry pumping stages 3a-3e while allowing the shafts 4 to rotate.
- the sealing device 6a, 6b comprises for example a seal, which may be a labyrinth seal, a so-called lip seal or a baffle or a combination of these embodiments.
- the vacuum pump 1 comprises for example at least a first and a second sealing device 6a, 6b, such as friction joints arranged in series on each shaft 4.
- the vacuum pump 1 further comprises at least one expansion device 12 configured to reduce the pressure variations between a pump-side volume 1 1 and the oil sump 2.
- the expansion device 12 comprises for example a deformable and gas-tight membrane.
- the expansion device 12 comprises for example a single membrane with a shaft passage or a plurality of membranes arranged in parallel.
- the shape and the material of the membrane can be to be considered according to the volumes to be varied on both sides of the membrane during the different pumping phases, the temperatures and operations of the vacuum pump 1 as well as available space.
- the membrane is for example of elastomeric material, such as "NBR” (or “butadiene-acrylonitrile copolymer”) or viton® (or “fluorocarbon rubber”). These materials make it possible to produce the necessary volume deformations, such as of the order of 500 cm 3 , are impervious to the pressure levels involved, resist pumped gases such as process gases and at high temperatures for example of the order 100 ° C and resist a large number of deformations without loss of performance.
- the membrane may comprise protective coatings, inserts and / or impregnated reinforcing webs such as woven and knitted webs to prevent tearing of the membrane.
- the membrane has for example a general shape of disc or cup in the rest position ( Figure 3).
- the surface is for example greater than 150 cm 2 .
- the diameter of a disk-shaped membrane is for example greater than 75 mm.
- the membrane is for example mounted in a rigid protective shell 13 ( Figure 4).
- the rigid protective shell 13 is for example formed by two half-shells 13a, 13b, for example in the form of caps and having for example annular mounting edges.
- the half-shells 13a, 13b are fixed together at their circular ends by sealingly sandwiching the periphery of the disk of the membrane.
- the half-shells 13a, 13b have a respective orifice 14.
- the expansion device 12 is interposed between, on the one hand, the pumping-side volume 11 situated between the at least one sealing device 6a, 6b and the third and third pumping stage. on the other hand, the volume of the oil sump 2.
- the pumping-side volume 11 is located between the at least one sealing device 6a, 6b and an outlet of the pumping stage located after the rotors 5, considering the direction of flow of the gases pumped into the pump 1 and the case where the oil sump 2 is located on the discharge side of the vacuum pump 1.
- a first tapping 15 made in the pump body 16 opens into the pumping-side volume 1 1 at the outlet of the pumping stage 3e, after the passage of the rotors 5, between the sealing device 6b and the non-return valve 23.
- This first tapping 15 is connected to a first orifice 14 of the rigid protective shell 13 of the membrane of the expansion device 12.
- a second tapping 17 made in the pump body 16 opens into the volume of the oil sump 2, for example in the upper part of the oil sump 2.
- This second tapping 17 is connected to the second orifice 14 of the shell 13, the first and second openings 14 being formed on either side of the membrane of the expansion device 12.
- a first side of the membrane communicates with the pumping-side volume 11 and a second side of the membrane communicates with the upper part of the oil sump 2.
- the volumes on either side of the sealing devices 6a, 6b , oil sump side 2 and pump side 11, are thus connected while being separated by a waterproof membrane and deformable, itself located in a shell 13 also sealed vis-à-vis the outside, the variations pressure causes deformation of the membrane.
- the membrane can deform when pressure differences occur on both sides of the membrane. These deformations lead to variations in the volumes on the pumping side 1 1 and the oil sump 2 and these volume variations make it possible to balance the pressures between the output of the pumping stage 3e and the oil sump 2.
- the sealing device 6a, 6b has friction seals
- the reduction of the pressure differences on either side of the sealing device 6a, 6b makes it possible to reduce the forces exerted on these seals and thus increase the life of the sealing device 6a, 6b.
- FIGS 7 and 8 illustrate a second embodiment in which the vacuum pump 1 is of primary type.
- the expansion device 12 directly separates the pump-side volume 11 interposed between an output of the pump stage 3e and the at least one sealing device 6b of the external atmosphere.
- the pressure in the oil sump 2 is the atmospheric pressure and the pump stage 3e is configured to discharge the gases pumped at atmospheric pressure after the non-return valve 23.
- a first tapping 15 made in the pump body 16 opens into the pump-side volume 11 situated between the rotors 5 of the pump stage 3e, the sealing device 6b and the non-return valve 23.
- This first tapping 15 is connected to a first orifice 14 of the rigid protective shell 13 of the membrane of the expansion device 12.
- the second orifice 14 of the shell 13 is left open.
- the membrane may deform when pressure differences occur on both sides of the membrane, between the pumping volume 1 1 volume and the outside atmosphere. These deformations cause variations in the pumping-side volume 1 1 at the outlet of the pumping stage 3e, which allows to equalize the pressure at the outlet of the pumping stage 3e with the atmospheric pressure and thus with the pressure prevailing in the oil sump 2.
- Figures 9 and 10 illustrate a third embodiment of the vacuum pump 1.
- the membrane of the expansion device 12 separates the volume of the oil sump 2 from a pump-side volume 24 interposed between the first and the second sealing devices 6a, 6b arranged in series on the shaft 4 .
- a first tapping 21 made in the pump body 16 opens between the sealing devices 6a, 6b.
- This first tapping 21 is connected to a first orifice 14 of the rigid protective shell 13 of the membrane of the expansion device 12.
- a second tapping 17 made in the pump body 16 opens into the volume of the oil sump 2, for example in the upper part of the oil sump 2.
- This second tapping 17 is connected to the second orifice 14 of the shell 13, the first and second openings 14 being formed on either side of the membrane of the expansion device 12.
- a first side of the membrane communicates with the first tapping 21 opening into a pump-side volume 24 between the sealing devices 6a, 6b and a second side of the membrane communicates with the upper part of the oil sump 2.
- the membrane can deform when pressure differences occur on both sides of the membrane, between the pumping side volume 24 and the volume of the oil sump 2. These deformations make it possible to balance the pressure between the volume-side pumping 24 between the sealing devices 6a, 6b and the pressure in the oil sump 2.
- Figure 12 illustrates a fourth embodiment of the vacuum pump 1.
- the membrane of the expansion device 12 directly separates the pump-side volume 24 interposed between the first and the second sealing devices 6a, 6b, of the external atmosphere.
- the pressure in the oil sump 2 is the atmospheric pressure and the pumping stage 3e is configured to discharge the pumped gases at atmospheric pressure.
- a first tapping 21 made in the pump body 16 opens between the sealing devices 6a, 6b.
- This first tapping 21 is connected to a first orifice 14 of the rigid protective shell 13 of the membrane.
- the second orifice 14 of the shell 13 is left open.
- the membrane In use, the membrane can deform when pressure differences occur on both sides of the membrane, between the pumping side volume 24 and the outside atmosphere. These deformations cause variations in the pump-side volume 24 interposed between the two sealing devices 6a, 6b, which makes it possible to balance the pressure of the pump-side volume 24 with the atmospheric pressure and thus with the pressure prevailing in the casing of the pump. oil 2.
- FIGS. 1 to 12 show a membrane having a generally disk-like shape, other shapes are conceivable.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1852940A FR3079886B1 (fr) | 2018-04-05 | 2018-04-05 | Pompe a vide de type seche |
PCT/EP2019/057792 WO2019192913A1 (fr) | 2018-04-05 | 2019-03-27 | Pompe à vide de type sèche |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3775558A1 true EP3775558A1 (fr) | 2021-02-17 |
EP3775558B1 EP3775558B1 (fr) | 2021-12-29 |
Family
ID=62528675
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19712244.3A Active EP3775558B1 (fr) | 2018-04-05 | 2019-03-27 | Pompe à vide de type sèche |
Country Status (7)
Country | Link |
---|---|
US (1) | US11499556B2 (fr) |
EP (1) | EP3775558B1 (fr) |
KR (1) | KR20200140839A (fr) |
CN (1) | CN111902632A (fr) |
FR (1) | FR3079886B1 (fr) |
TW (1) | TW201943963A (fr) |
WO (1) | WO2019192913A1 (fr) |
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DE202021100874U1 (de) * | 2021-02-23 | 2022-05-30 | Marlina Hamm | Wälzkolbengebläse zur Entspannung eines dampfförmigen Mediums bei hohem Druck und guter Dichtigkeit |
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JP4617615B2 (ja) * | 2001-07-05 | 2011-01-26 | 株式会社豊田自動織機 | 真空ポンプにおける油洩れ防止構造 |
EP2137412B1 (fr) * | 2007-04-17 | 2012-12-05 | Spinnler Engineering | Machine de refoulement construite selon le principe de la spirale |
JP4365443B1 (ja) * | 2008-07-29 | 2009-11-18 | 株式会社神戸製鋼所 | 無給油式スクリュ圧縮機 |
GB0922564D0 (en) * | 2009-12-24 | 2010-02-10 | Edwards Ltd | Pump |
DE202015007606U1 (de) * | 2015-11-03 | 2017-02-06 | Leybold Gmbh | Trockenvakuumpumpe |
-
2018
- 2018-04-05 FR FR1852940A patent/FR3079886B1/fr active Active
-
2019
- 2019-03-27 US US17/044,615 patent/US11499556B2/en active Active
- 2019-03-27 CN CN201980021782.8A patent/CN111902632A/zh active Pending
- 2019-03-27 EP EP19712244.3A patent/EP3775558B1/fr active Active
- 2019-03-27 KR KR1020207030841A patent/KR20200140839A/ko active Search and Examination
- 2019-03-27 WO PCT/EP2019/057792 patent/WO2019192913A1/fr active Application Filing
- 2019-04-01 TW TW108111512A patent/TW201943963A/zh unknown
Also Published As
Publication number | Publication date |
---|---|
FR3079886A1 (fr) | 2019-10-11 |
EP3775558B1 (fr) | 2021-12-29 |
US11499556B2 (en) | 2022-11-15 |
FR3079886B1 (fr) | 2020-04-24 |
CN111902632A (zh) | 2020-11-06 |
US20210108638A1 (en) | 2021-04-15 |
KR20200140839A (ko) | 2020-12-16 |
WO2019192913A1 (fr) | 2019-10-10 |
TW201943963A (zh) | 2019-11-16 |
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