EP3924625A1 - Pompe à vide primaire de type sèche - Google Patents
Pompe à vide primaire de type sècheInfo
- Publication number
- EP3924625A1 EP3924625A1 EP20701063.8A EP20701063A EP3924625A1 EP 3924625 A1 EP3924625 A1 EP 3924625A1 EP 20701063 A EP20701063 A EP 20701063A EP 3924625 A1 EP3924625 A1 EP 3924625A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- vacuum pump
- purge gas
- duct
- heated
- stage
- 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.)
- Withdrawn
Links
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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/0092—Removing solid or liquid contaminants from the gas under pumping, e.g. by filtering or deposition; Purging; Scrubbing; Cleaning
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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
- F04C18/08—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
- F04C18/123—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 or approximately radially from the rotor body extending tooth-like elements, co-operating with recesses in the other rotor, e.g. one tooth
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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
- F04C18/08—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
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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
- 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
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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
- 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
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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
- 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
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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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/04—Heating; Cooling; Heat insulation
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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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/04—Heating; Cooling; Heat insulation
- F04C29/042—Heating; Cooling; Heat insulation by injecting a fluid
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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
- F04C2220/00—Application
- F04C2220/10—Vacuum
- F04C2220/12—Dry running
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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
- F04C2240/00—Components
- F04C2240/50—Bearings
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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
- F04C2240/00—Components
- F04C2240/80—Other components
- F04C2240/806—Pipes for fluids; Fittings therefor
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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
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/19—Temperature
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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
- F04C2280/00—Arrangements for preventing or removing deposits or corrosion
- F04C2280/02—Preventing solid deposits in pumps, e.g. in vacuum pumps with chemical vapour deposition [CVD] processes
Definitions
- the present invention relates to a primary vacuum pump of the dry type such as of the “Roots” or “Claw” or screw type.
- Primary vacuum pumps of the dry type have several pumping stages in series in which a gas to be pumped circulates between a suction and a discharge.
- a gas to be pumped circulates between a suction and a discharge.
- rotary lobes also known under the name “Roots” or those with spout, also known under the name “Claw” or else those with screws.
- These vacuum pumps are called “dry” because in operation, the rotors rotate inside a stator without any mechanical contact between them or with the stator, which means that no oil is used in the pumping stages. .
- Certain primary vacuum pumps are employed in processes using chemistries which generate solid by-products, for example in the form of powder, paste or pieces. This is the case, for example, with certain manufacturing processes for semiconductors, photovoltaic screens, flat screens or LEDs. These solid or condensable by-products can be sucked in by the vacuum pump and alter its operation, in particular by hampering the rotation of the rotors or even preventing it completely in the worst case. Certain applications also release potentially explosive and / or flammable by-products or gases, such as H 2 , SiH 4 , TEOS.
- the pumped gases are generally diluted by a purge gas injected into the vacuum pump.
- Nitrogen is usually injected through injection nozzles distributed along the vacuum pump, at each pumping stage. It may sometimes be necessary to also purge the pipe located downstream of the vacuum pump by injecting an additional purge gas, sometimes heated, to prevent these gases from condensing at the outlet of the vacuum pump, in the pipes or the pipes.
- gas treatment systems also called abatement systems.
- An object of the present invention is to improve the efficiency of the purging of the vacuum pump. Another object of the present invention is to reduce the costs associated with purging the pumped gases.
- the invention relates to a primary vacuum pump of the dry type comprising:
- stator comprising at least two pumping stages connected in series between a suction and a discharge of the vacuum pump
- a duct formed in the stator one inlet of which is intended to be connected to at least one source of purge gas and of which at least one outlet orifice communicates with the last pumping stage communicating with the discharge, and
- a device for injecting a heated purge gas comprising a heater configured to at least partially heat the purge gas injected into the duct to a temperature above 40 ° C.
- Heating part of the flow of the purge gas injected into the discharge pumping stage makes it possible to increase the flow of the purge gas injected significantly, without modifying the thermal balance of the vacuum pump.
- the purge gas injected into the delivery pumping stage makes it possible to effectively dilute the pumped gases, in particular potentially explosive and / or flammable gases such as H 2 , SiH 4 , TEOS or condensable gases, such as sub - reaction products.
- the dilution carried out at the level of the discharge pumping stage makes it possible to dilute the gases directly in the vacuum pump, as close as possible to the discharge, by eliminating the cold areas or too little diluted, between the vacuum pump and a point of prior art purge gas injection downstream of the vacuum pump.
- the pumped gases are prevented from condensing in the pipes located downstream of the vacuum pump or in the gas treatment systems and in the vacuum pump.
- the service life of the vacuum pump can be extended.
- the purge gas injected directly into the vacuum pump is hotter when it reaches the pipes located downstream than if it had been heated with the same energy and injected directly into these pipes downstream.
- the electricity consumption for heating the purge gas can therefore be reduced compared to an external heating solution, downstream of the vacuum pump.
- the outlet of the duct communicates with at least one shaft passage of the stator communicating with the last pumping stage via a clearance between the shaft and the shaft passage.
- the purge gas is thus diffused in the pumping stage, around the at least one shaft.
- the duct communicates, for example, with the two shaft passages of the pumping stage.
- the vacuum pump may further include at least one sealing device interposed between a lubricated bearing of the vacuum pump and the pumping stage, to seal a shaft passage.
- the duct communicates with the shaft passage, between the sealing device and the pumping stage. The purge gas thus injected in front of the sealing device forms a barrier between the pumped gases and the sealing device, thereby increasing the service life of the latter.
- the duct has a linear portion connected to the inlet orifice, the linear portion being interposed between the two shafts and communicating with two cavities in the shape of crescent moon, each cavity communicating with a passage of respective tree.
- the purge gas is thus diffused into the pumping stage, around the trees, through the crescent-shaped cavities, in front of the sealing devices.
- the device for injecting a heated purge gas may further include: a temperature sensor in fluid communication with the purge gas heated by the heating device, and
- a controller connected to a power supply for the heating device and to the temperature sensor, to control the temperature of the purge gas.
- the power supply can thus be controlled at a given temperature setpoint, depending on the temperature measurement made by the temperature probe.
- the power of the purge gas heating can thus be adapted automatically as a function of the purge gas flow rate and the temperature setpoint requested.
- the controller can also cut off the injection of a purge gas by the device for injecting a heated purge gas if it finds a temperature fault. It is in fact preferable not to over-dilute if the surplus purge gas cannot be heated, as this would modify the thermal equilibrium of the vacuum pump, which would risk allowing for example the deposition of condensable species.
- the device for injecting a heated purge gas may further include a flow regulator, for example manual, to adjust the flow of the purge gas, as well as a flow measurement device configured to measure the gas flow. injected purge.
- a flow regulator for example manual, to adjust the flow of the purge gas
- a flow measurement device configured to measure the gas flow. injected purge.
- the output of the flow measurement device can also be connected to the controller which can, for example, cut off the power to the heater if it notices an absence of flow or a flow of purge gas that is too low.
- the device for injecting a heated purge gas can be configured so that the portion of the flow of heated purge gas is, for example, between 10% and 100% of the purge gas injected into the pipe.
- a mixture between on the one hand, an unheated purge gas (between 0 and 90%) and on the other hand, a heated purge gas (between 10 and 100%) is thus injected into the pipe.
- the device for injecting a heated purge gas can be configured so that the flow rate of the heated purge gas is, for example, greater than 33.8 Pa.m 3 / s.
- the heater can be configured to heat the purge gas to a temperature below 200 ° C.
- the heating device comprises a heating cartridge comprising resistive heating elements arranged in a tube between an inlet and an outlet of the tube in which a purge gas is intended to circulate in order to be heated.
- the heating cartridge is advantageously placed as close as possible to the inlet of the duct, for example by means of a thermally insulated pipe
- the vacuum pump may include a cooling circuit at least partially integrated in the stator and surrounding the duct.
- the stator is not overheated due to the injection of the hot purge gas in particular because it can be controlled in temperature by means of the cooling circuit.
- the vacuum pump may further include a bearing purge duct formed in the stator, intended to be connected to a source of purge gas, and opening into at least one bearing of the vacuum pump.
- the vacuum pump may further include at least one stage purge duct formed in the stator, intended to be connected to a source of purge gas, and opening into an inter-stage channel connecting the output of a stage of pumping to an inlet of the following pumping stage.
- the vacuum pump comprises a distributor intended to be connected, on the one hand, to a source of purge gas and, on the other hand, to the bearing purge duct, to the duct (s). stage drain, to the duct and to a pipe connected to an outlet of the heater.
- the vacuum pump may further include an additional heater configured to heat at least a portion of the purge gas delivered by the distributor.
- FIG. 1 shows a schematic side view of a vertical longitudinal section of elements of a dry vacuum pump according to the invention.
- FIG. 2 shows a cross-sectional view of the elements of the vacuum pump of Figure 1 at a pump stage.
- FIG. 3 shows a schematic top view of a horizontal longitudinal section of the elements of the vacuum pump of Figure 1.
- FIG. 4 shows a cross-sectional view of the elements of the vacuum pump of Figure 1 at a first support of the vacuum pump.
- FIG. 5 shows a schematic view of a device for injecting a heated purge gas.
- FIG.6 shows a schematic longitudinal sectional view of a heater for the injection device of a heated purge gas.
- FIG.7 shows another schematic representation of the vacuum pump.
- a primary vacuum pump is defined as a positive displacement vacuum pump, which is configured to, using two rotors, suck, transfer and then discharge the gas to be pumped at atmospheric pressure.
- the rotors are carried by two shafts driven in rotation by a motor of the primary vacuum pump.
- the primary vacuum pump can be started from atmospheric pressure.
- upstream is understood to mean an element which is placed before another relative to the direction of circulation of the gas to be pumped.
- downstream is understood to mean an element placed after another relative to the direction of flow of the gas to be pumped, the element located upstream in the direction of pumping of the gases being at a lower pressure than the gas flow. element located downstream.
- the primary vacuum pump 1 of the dry type comprises a stator 2 comprising at least two pumping stages 3a-3e connected in series between a suction 4 and a discharge 5 and two rotors 6 arranged in the at least two pumping stages 3a-3e ( Figure 1).
- the stator 2 is defined by all the static parts of the vacuum pump 1, in particular forming the chambers of the pumping stages 3a-3e.
- the rotors 6 are carried by shafts 7 configured to rotate in a synchronized manner in the opposite direction to drive a gas to be pumped between the suction 4 and the discharge 5.
- the shafts 7 are driven by a motor 8 of the vacuum pump 1.
- the rotors 6 have, for example, lobes of identical profiles, for example of the "Roots” type ( Figure 2) or of the "Claw” type or are of the screw type or another similar principle of a positive displacement vacuum pump.
- the vacuum pump 1 comprises for example five pumping stages 3a, 3b, 3c, 3d, 3e, in which a gas to be pumped can circulate.
- Each pumping stage 3a, 3b, 3c, 3d, 3e is formed by a chamber receiving the rotors 6, the chambers comprising a respective inlet and outlet.
- the successive pumping stages 3a-3e are connected in series one after the other by respective inter-stage channels 9 connecting the outlet of the preceding pumping stage 3a-3d to the inlet of the pumping stage. pumping 3b-3e which follows.
- the inlet of the first pumping stage 3a (also called the low pressure pumping stage) communicates with the suction 4 of the vacuum pump 1.
- the output of the last pumping stage 3e (also called the high pressure pumping stage or discharge pumping), communicates with discharge 5.
- the pumping stages 3b-3c-3d interposed between the high pressure pumping stage 3e and the low pressure pumping stage 3a are called intermediate pumping stages.
- the vacuum pump 1 is a primary vacuum pump that can be started at atmospheric pressure and configured to deliver the pumped gases at atmospheric pressure.
- the motor 8 driving the shafts 7 is for example located at one end of the vacuum pump 1, for example on the side of the last pumping stage 3e.
- the vacuum pump 1 may include at least one lubricant casing 10.
- the lubricant such as grease and / or oil, makes it possible to lubricate in particular the bearings of the bearings 11 supporting the shafts 7 of the rotors 6 and the gears 12. synchronization of shafts 7 ( Figure 3).
- the vacuum pump 1 comprises for example a lubricant casing 10 arranged between the motor 8 and the first or the last pumping stage 3a or 3e.
- the bearings 11 of the shafts 7 can be lubricated by grease at the other end of the vacuum pump 1 or by a second lubricant sump.
- At least one lubricant sealing device 13a, 13b can be interposed between a lubricated bearing 11 and a pumping stage 3e, 3a in order to seal a shaft passage 14a, 14b.
- the sealing devices 13a, 13b create a very low conductance in the shaft passages 14a, 14b, around the rotating shafts 7, making it possible to greatly limit the passage of lubricating fluids, in particular from the lubricant casing 10 to the pumping stages. 3a-3e secs while allowing shafts 7 to turn.
- Each sealing device 13a, 13b comprises for example at least one seal, such as two, surrounding a shaft 7 ( Figure 3).
- the seal is for example a so-called lip seal, a labyrinth seal or a baffle or a combination of these embodiments.
- the vacuum pump 1 further comprises a device for injecting a heated purge gas 15 and a conduit 16.
- the conduit 16 is formed in the stator 2.
- An inlet port 16a of the conduit 16 is intended to be connected to at least one source of purge gas.
- the conduit 16 has at least one outlet 16b, 16c, which communicates with the last pumping stage 3e which communicates with the discharge 5, to inject a purge gas, such as nitrogen, into the pumping stage 3rd pushback.
- the outlet of the duct opens out from the stator 2, for example directly into the last pumping stage 3e, in the housing receiving the rotors 6 (not shown).
- the outlet orifice 16b, 16c of the duct 16 communicates with at least one shaft passage 14a, 14b, communicating with the last pumping stage 3e via a clearance between the shaft 7 and the passage shaft 14a, 14b of stator 2.
- the duct 16 thus passes through the stator 2 to convey the purge gas in the pumping stage 3e through the at least one shaft passage 14a, 14b.
- the purge gas is thus diffused around the at least one shaft 7 in the pumping stage 3e.
- the conduit 16 communicates with the at least shaft passage 14a, 14b, between the sealing device 13a, 13b and the pumping stage 3e.
- the purge gas thus injected in front of the sealing devices 13a, 13b makes it possible to form a barrier between the pumped gases and the sealing devices 13a, 13b, which makes it possible to increase the service life of the latter.
- the conduit 16 can be made in a first support 17 (or high pressure support) of the stator 2 arranged against the 3rd high pressure pumping stage ( Figures 1 and 3).
- the conduit 16 communicates for example with the two shaft passages 14a, 14b of the 3rd pumping stage ( Figure 4).
- the duct 16 is produced by machining. It has for example a linear portion 18 connected to the inlet orifice 16a.
- the linear portion 18 is perpendicular to the axis of the shafts 7 and interposed between the two shafts 7.
- the linear portion 18 communicates with two cavities 20a, 20b, here in the shape of a crescent moon.
- the diameter of the moon is significantly smaller than that of the shaft passage 14a, 14b.
- the crescent moons are connected back to back by the linear portion 18.
- Each cavity 20a, 20b communicates with a shaft passage 14a, 14b respective to the level of the outlet orifices 16a, 16b of the duct 16.
- the purge gas is thus diffused into the pumping stage 3e, around the shafts 7, through the cavities 20a, 20b in the shape of a crescent moon, in front of the devices of sealing 13a, 13b.
- the inlet port 16a of the linear portion 18 opening out to the outside of the stator 2 is for example connected by at least one pipe 21a, 21b, such as flexible, to a connector 22, for example mounted on a frame of vacuum pump 1 and intended to be connected to a purge gas source, external to vacuum pump 1.
- the device for injecting a heated purge gas 15 includes a heater 24 configured to at least partially heat the purge gas injected into the conduit 16, to a temperature above 40 ° C.
- the heating temperature is for example less than 200 ° C.
- a temperature set point for heating the purge gas is provided for of 100 ° C.
- the portion of the flow of heated purge gas injected into the conduit 16 is for example between 10% and 100%.
- the flow rate of the heated purge gas is for example greater than 20slm (i.e. 33.8Pa.m 3 / s) and for example less than 200slm (i.e. 338Pa.m 3 / s), such as 120slm (i.e. 202.7Pa.m 3 / s).
- a mixture of heated purge gas and unheated purge gas can thus be injected into line 16.
- the heated purge gas flow rate is 60slm (i.e. 101.35Pa.m 3 / s) and the flow rate unheated purge gas is also 60slm.
- Heating part of the flow of the purge gas injected into the delivery pumping stage 3e makes it possible to increase the flow of the purge gas injected significantly, without modifying the thermal balance of the vacuum pump 1.
- the mixing of the potentially unheated purge gas and the heated purge gas, injected at the at least one shaft passage 14a, 14b allows the flow of the purge gas to be increased significantly to effectively dilute the gases.
- pumped, in particular potentially explosive and / or flammable gases such as H 2 , SiH 4 , TEOS or condensable gases, such as reaction by-products.
- the dilution carried out at the level of the delivery pumping stage 3e makes it possible to dilute the gases directly in the vacuum pump 1, as close as possible to the discharge 5.
- the service life of the vacuum pump can be extended.
- the purge gas injected directly into the vacuum pump 1 is hotter when it reaches the downstream pipes than if it had been heated with the same energy and injected directly into these downstream pipes.
- the electricity consumption for heating the purge gas can therefore be reduced compared to an external heating solution, downstream of the vacuum pump 1.
- the vacuum pump 1 comprises a cooling circuit 25 for cooling the stator 2 (FIG. 4).
- the cooling circuit 25 comprises for example a hydraulic circuit allowing the circulation of water, for example at room temperature.
- the cooling circuit 25 is for example at least partially integrated in the stator 2, for example in the first support 17 in which the duct 16 is provided. It has for example a "U" shape surrounding the duct 16.
- the stator 2 is not overheated due to the injection of hot purge gas in particular because it can be controlled in temperature by means of the cooling circuit 25. .
- the heating device 24 comprises a heating cartridge comprising resistive heating elements 26 arranged in a tube 27 between an inlet 27a and an outlet 27b of the tube 27 in which a Purge gas is intended to flow to be heated.
- the heating cartridge is advantageously placed as close as possible to the inlet port 16a of the duct 16.
- the pipe 21b connecting the outlet 27b of the tube 27 of the heating cartridge to the pipe 16 of the vacuum pump 1 is for example thermally insulated.
- the device for injecting a heated purge gas 15 further comprises a temperature sensor 28 in communication. fluidic with the purge gas heated by the heater 24 and a controller 30, such as an electronic board, connected to a power supply of the heater 24 and to the temperature probe 28.
- the controller 30 is configured to control the temperature. purge gas heating temperature.
- the temperature probe 28, such as a thermocouple, is for example arranged at one end of the tube 27 on the side of the output 27b and the supply of the resistive heating elements 26, for example in current, passes through the other end of the tube 27 on the side of the inlet 27a, through a sealed passage 31.
- the supply can thus be controlled at a given temperature setpoint, as a function of the temperature measurement carried out by the temperature probe 28.
- the power of the purge gas heating in the heating cartridge can thus adapt automatically according to the temperature. purge gas flow rate and the temperature setpoint requested.
- the controller 30 can further cut off the injection of a purge gas by the heated purge gas injection device 15 if it finds a temperature fault. It is in fact preferable not to over-dilute if the surplus purge gas cannot be heated because this would modify the thermal equilibrium of the vacuum pump 1, which would risk allowing for example the deposition of condensable species.
- the device for injecting a heated purge gas 15 may further comprise a flow regulator 32, for example manual, for adjusting the flow of the purge gas, as well as a flow measuring device 33 configured to measure the flow rate. flow of injected purge gas.
- the output of the flow measurement device 33 can also be connected to the controller 30 which can, for example, cut off the heating power supply if it finds an absence of flow or a purge flow that is too low.
- the flow regulator 32 and the flow measuring device 33 are for example arranged upstream of the heating device 24 in the direction of flow of the purge gas going from the purge gas source to the heating device 24 (see arrows in Figure 5).
- An isolation valve 34 can be arranged upstream of the heating device 24, for example between the flow regulator 32 and the flow measuring device 33.
- the device for injecting a heated purge gas 15 is for example mounted on the frame of the vacuum pump 1 supporting the stator 2.
- the vacuum pump 1 can also include a bearing purge duct 35 formed in the stator 2, and opening into at least one bearing 11 of the vacuum pump 1 and / or at least one stage purge duct 36, formed in the stator 2, and opening into an inter-stage channel 9 connecting the outlet of a pumping stage 3a-3d to an inlet of the pumping stage 3b-3e which follows, to distribute a purge gas in all or part of the inter-stage channels 9 ( Figure 1).
- the bearing purge duct 35 passes through the stator 2 to convey the purge gas into the at least one bearing 11 receiving the bearings.
- the bearing purge duct 35 is provided in a second support 37 (or low pressure support) of the stator 2 in which the bearings 11 are mounted ( Figures 1 and 3).
- the second support 37 is arranged against the low pressure pumping stage 3a.
- the bearing purge duct 35 communicates for example with the two bearings 11.
- the bearing purge duct 35 has a first linear portion, perpendicular to the axis of the shafts 7 and interposed between the two shafts 7.
- the first linear portion communicates with a second linear portion whose ends communicate with a respective bearing 11 ( Figure 3).
- the stage purge duct 36 passes through the stator 2 to convey the purge gas to the level of at least one inter-stage channel 9.
- the vacuum pump 1 comprises for example three stage purge ducts 36 opening into a respective inter-stage channel 9, for example near the outlet of the pumping stage 3b-3d.
- the bearing purge conduit 35, the stage purge conduits 36, the conduit 16 and the pipe 21b connected to the outlet 27b of the heater 24 are intended to be connected to a source of purge gas, external to the vacuum pump 1, for example via a distributor 38 ( Figure 7).
- the distributor 38 comprises a common trunk 38a connected to a first and a second branch 38b, 38c.
- the first branch 38b connects the common trunk 38a to the bearing purge duct 35 formed in the second support 37 of the stator 2.
- the second branch 38c is connected by pipes 38d, 38e to the stage purge ducts 36 and to the duct 16 .
- the inlet of the common trunk 38a is intended to be connected to a source of purge gas, such as nitrogen.
- a first isolation valve and a regulator are for example arranged on the common trunk 38a, a second isolation valve can be arranged on the first branch 38b and a third isolation valve can be arranged on the second branch 38c. It is thus possible to ensure a purge adapted to the nature of the pumped gases. For example, only the bearings 11 are purged in the case of pumping non-condensable and / or non-flammable gases.
- the first branch 38b and the three conduits 38d connected to the stage purge conduits 36 are for example provided with injection nozzles or nozzles making it possible to define a purge flow rate in the bearing purge conduit 35 and in each conduit. stage 36.
- the pipe 38e connected to the pipe 16 may also include an injection nozzle or nozzle, arranged upstream of the intersection of the pipe 38e with the pipe 21b connected to the outlet of the heating device 24 in the direction of flow of the purge gas.
- the purge gas injected into distributor 38 via line 38e, bearing purge conduit 35, and stage purge conduits 36 may not be heated.
- the vacuum pump 1 may include an additional heating device 39 configured to heat at least in part the purge gas distributed by the distributor 38, in the first and / or the second branch 38b, 38c and / or in the pipe. 38e connected to pipe 16 and pipe 21 b.
- the additional heating device 39 is for example arranged on the second branch 38c connected to the pipes 38d, 38e.
- This heating can be independent of the heating of the purge gas by the heating device 24.
- the flow rate and / or the temperature can be controlled independently for each pumping stage 3b-3e and for the bearings 11 of the second support 37, or at least independently of the flow rate and the temperature of the purge gas injected by means of the device for injecting a heated purge gas 15.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Non-Positive Displacement Air Blowers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1901520A FR3092879B1 (fr) | 2019-02-14 | 2019-02-14 | Pompe à vide primaire de type sèche |
| PCT/EP2020/051542 WO2020164877A1 (fr) | 2019-02-14 | 2020-01-22 | Pompe à vide primaire de type sèche |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3924625A1 true EP3924625A1 (fr) | 2021-12-22 |
Family
ID=66776608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20701063.8A Withdrawn EP3924625A1 (fr) | 2019-02-14 | 2020-01-22 | Pompe à vide primaire de type sèche |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US20220120279A1 (fr) |
| EP (1) | EP3924625A1 (fr) |
| JP (1) | JP2022520431A (fr) |
| KR (1) | KR20210126547A (fr) |
| CN (1) | CN113330219A (fr) |
| FR (1) | FR3092879B1 (fr) |
| TW (1) | TWI825265B (fr) |
| WO (1) | WO2020164877A1 (fr) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3112177B1 (fr) * | 2020-07-09 | 2022-07-08 | Pfeiffer Vacuum | Ligne de vide et procédé de contrôle d’une ligne de vide |
| FR3129851A1 (fr) * | 2021-12-08 | 2023-06-09 | Pfeiffer Vacuum | Ligne de vide et installation comportant la ligne de vide |
| GB2614285B (en) * | 2021-12-23 | 2024-03-06 | Edwards Ltd | Vacuum pump with reduced seal requirements |
| TW202441072A (zh) * | 2023-04-05 | 2024-10-16 | 英商愛德華有限公司 | 真空泵 |
| CN116428185A (zh) * | 2023-04-12 | 2023-07-14 | 北京通嘉宏瑞科技有限公司 | 真空泵以及气体供给系统 |
| CN117072446A (zh) * | 2023-06-25 | 2023-11-17 | 浙江博亚精密机械有限公司 | 一种真空泵上的热力平衡系统 |
| KR102856868B1 (ko) * | 2023-07-25 | 2025-09-08 | 프로인주식회사 | 진공 펌프 |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4762980A (en) * | 1986-08-07 | 1988-08-09 | Thermar Corporation | Electrical resistance fluid heating apparatus |
| JPH086708B2 (ja) * | 1988-03-18 | 1996-01-29 | 株式会社日立製作所 | 真空ポンプ |
| JP4881617B2 (ja) * | 2002-10-14 | 2012-02-22 | エドワーズ リミテッド | 洗浄設備を備えた回転ピストン型真空ポンプ |
| US20040118343A1 (en) * | 2002-12-18 | 2004-06-24 | Tapp Frederick L. | Vacuum chamber load lock purging method and apparatus |
| JP4232505B2 (ja) * | 2003-03-27 | 2009-03-04 | アイシン精機株式会社 | 真空ポンプ |
| KR20060021696A (ko) * | 2004-09-03 | 2006-03-08 | 삼성전자주식회사 | 반도체 제조 설비의 진공펌프 |
| GB0519742D0 (en) * | 2005-09-28 | 2005-11-09 | Boc Group Plc | Method of pumping gas |
| GB2440341B (en) * | 2006-07-24 | 2011-09-21 | Boc Group Plc | Vacuum pump |
| GB0922564D0 (en) * | 2009-12-24 | 2010-02-10 | Edwards Ltd | Pump |
| JP2011163150A (ja) * | 2010-02-05 | 2011-08-25 | Toyota Industries Corp | 水素ガスの排気方法及び真空ポンプ装置 |
| KR101286187B1 (ko) * | 2011-11-08 | 2013-07-15 | 데이비드 김 | 다단형 건식 진공펌프 |
| FR2993614B1 (fr) * | 2012-07-19 | 2018-06-15 | Pfeiffer Vacuum | Procede et dispositif de pompage d'une chambre de procedes |
| JP5304934B2 (ja) * | 2012-07-25 | 2013-10-02 | 富士通セミコンダクター株式会社 | 真空ポンプの運転方法及び半導体装置の製造方法 |
| KR102217790B1 (ko) * | 2012-09-26 | 2021-02-18 | 어플라이드 머티어리얼스, 인코포레이티드 | 기체 화합물들을 퍼징하기 위한 장치 및 방법 |
| US20140112650A1 (en) * | 2012-10-19 | 2014-04-24 | Edwards Vacuum, Inc. | Cartridge heater apparatus |
| JP2014185584A (ja) * | 2013-03-22 | 2014-10-02 | Technos:Kk | ドライ真空ポンプの内部で副生成物が凝固堆積することを防止する方法及び窒素ガス昇温装置 |
| GB2535703B (en) * | 2015-02-23 | 2019-09-18 | Edwards Ltd | Gas supply apparatus |
-
2019
- 2019-02-14 FR FR1901520A patent/FR3092879B1/fr active Active
-
2020
- 2020-01-22 EP EP20701063.8A patent/EP3924625A1/fr not_active Withdrawn
- 2020-01-22 WO PCT/EP2020/051542 patent/WO2020164877A1/fr not_active Ceased
- 2020-01-22 KR KR1020217020471A patent/KR20210126547A/ko not_active Ceased
- 2020-01-22 JP JP2021547372A patent/JP2022520431A/ja active Pending
- 2020-01-22 CN CN202080010259.8A patent/CN113330219A/zh active Pending
- 2020-01-22 US US17/427,785 patent/US20220120279A1/en not_active Abandoned
- 2020-02-03 TW TW109103240A patent/TWI825265B/zh active
Also Published As
| Publication number | Publication date |
|---|---|
| TWI825265B (zh) | 2023-12-11 |
| FR3092879B1 (fr) | 2021-02-19 |
| US20220120279A1 (en) | 2022-04-21 |
| KR20210126547A (ko) | 2021-10-20 |
| WO2020164877A1 (fr) | 2020-08-20 |
| TW202043621A (zh) | 2020-12-01 |
| CN113330219A (zh) | 2021-08-31 |
| JP2022520431A (ja) | 2022-03-30 |
| FR3092879A1 (fr) | 2020-08-21 |
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