WO2006095132A1 - Apparatus for inhibiting the propagation of a flame front - Google Patents
Apparatus for inhibiting the propagation of a flame front Download PDFInfo
- Publication number
- WO2006095132A1 WO2006095132A1 PCT/GB2006/000592 GB2006000592W WO2006095132A1 WO 2006095132 A1 WO2006095132 A1 WO 2006095132A1 GB 2006000592 W GB2006000592 W GB 2006000592W WO 2006095132 A1 WO2006095132 A1 WO 2006095132A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- waste stream
- flame
- pumping mechanism
- combustion chamber
- process chamber
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C4/00—Flame traps allowing passage of gas but not of flame or explosion wave
- A62C4/02—Flame traps allowing passage of gas but not of flame or explosion wave in gas-pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D19/00—Axial-flow pumps
- F04D19/02—Multi-stage pumps
- F04D19/04—Multi-stage pumps specially adapted to the production of a high vacuum, e.g. molecular pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/02—Surge control
- F04D27/0292—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
Definitions
- the present invention relates to apparatus for, and a method of, inhibiting the propagation of a flame front ignited by a pumping mechanism drawing a waste stream from a process chamber.
- a vacuum pumping mechanism typically comprises a metal rotor cooperating with a metal stator to convey fluid from an inlet of the vacuum pump to an outlet thereof. These components of the pumping mechanism are required to have a close tolerance such that fluid being pumped is inhibited from leaking back towards the inlet of the pump. The proximity of these two metal components is by its very nature inclined to represent an ignition source as any clashing of components may generate a spark.
- the mixing between the flammable mixture and the inert gas is particularly good, it is possible for pockets of flammable gas to be formed within the pump. This is particularly likely where the inert gas is introduced part way down the pump to avoid fluctuations in pressure in the upstream process chamber. In this scenario, whilst some of the inert gas will be transmitted back towards the process chamber to effect some dilution in the lower pressure region, the quantity may be insufficient to achieve the appropriate dilution levels, in other words the mixture (or at least pockets of the mixture) may remain within the flammable range. It is an object of at least the preferred embodiment of the present invention to seek to solve these and other problems.
- apparatus for inhibiting the propagation of a flame front ignited by a pumping mechanism of a vacuum pumping arrangement drawing a waste stream from a process chamber, the apparatus comprising: means for detecting a pressure at a location through which the waste stream is drawn by the pumping mechanism; and means for regulating the delivery of at least one process fluid to the process chamber when the detected pressure is greater than a pressure above which the flame front can be sustained by the waste stream.
- the apparatus may comprise a foreline for conveying the waste stream from the process chamber to the pumping mechanism.
- the detection means may be arranged to detect the pressure within the foreline.
- the regulating means may comprise at least one shut off valve for preventing delivery of at least one process fluid to the process chamber.
- the regulating means may comprise a controller for receiving a signal indicative of the detected pressure.
- the shut off valve may be controlled by the controller.
- the vacuum pumping arrangement may comprises a further pumping mechanism located upstream of the pumping mechanism.
- the further pumping mechanism is preferably provided by a booster pump, for example a Roots blower.
- Means for cooling the waste stream may be provided between the process chamber and the pumping mechanism.
- the aforementioned booster pump may serve as the cooling mechanism.
- the cooling means may comprise an internal cooling mechanism located within the foreline, for example, one or more cooling baffles, one or more cooling fingers and/or one or more cooling coils.
- the cooling means may comprise an external cooling mechanism located adjacent the outer surface of the foreline, for example a Peltier device and/or a cooling coil.
- the apparatus may comprise an exhaust pipe connected to an exhaust of the vacuum pumping arrangement.
- the pipe may be configured to inhibit escalation to detonation of a deflagration occurring within the pipe.
- the exhaust pipe may comprise at least one of the group of one or more detonation barriers, one or more purge ports, one or more sections of varying diameter and one or more sections of varying orientation.
- This inert gas delivering means may comprise at least one purge port located within a stator of the pumping mechanism or the purge port may be located so as to introduce inert gas to the waste stream exhaust from the pumping mechanism.
- the delivering means may comprise heating means configured to heat the purge gas prior to delivery thereof.
- the apparatus may comprise abatement apparatus for receiving the waste stream exhausted from the pumping mechanism.
- the abatement apparatus may comprise a combustion chamber having an inlet for receiving the waste stream exhausted from the pumping mechanism.
- the combustion chamber may also comprise means for generating a flame for burning a flammable component of the waste stream within the combustion chamber.
- the abatement apparatus may comprise means for detecting the presence of a flame in the combustion chamber.
- the regulating means may be configured to regulate the delivery of at least one process fluid to the process chamber when no flame is detected within the combustion chamber.
- Means for delivering inert gas into the waste stream exhausted from the pumping mechanism when there is no flame is detected within the combustion chamber may be provided.
- the inlet of the combustion chamber may be configured to prevent a flame from the combustion chamber from propagating into the waste stream upstream from the combustion chamber.
- the regulation means may be dependent not only on the pressure in the inlet region of the pump but also on the presence of a flame within the combustion chamber. Consequently, according to another aspect of the present invention there is provided apparatus for inhibiting the propagation of a flame front ignited by a pumping mechanism drawing a waste stream from a process chamber, the apparatus comprising: a combustion chamber comprising an inlet for receiving the waste stream exhaust from the pumping mechanism and means for generating a flame for burning a flammable component of the waste stream; means for detecting a pressure at a location through which the waste stream is drawn by the pumping mechanism; means for detecting the presence of a flame in the combustion chamber; and means for regulating the delivery of at least one process fluid to the process chamber either when the detected pressure is greater than a pressure above which the flame front can be sustained by the waste stream or when there is no flame present in the combustion chamber.
- the regulation of the supply may be dependent solely on the presence of a flame within a combustion chamber positioned downstream of a pumping mechanism. Consequently, according to another aspect of the present invention there is provided apparatus for inhibiting the propagation of a flame front ignited by a pumping mechanism drawing a waste stream from a process chamber, the apparatus comprising: a combustion chamber comprising an inlet for receiving the waste stream from the pumping mechanism and means for generating a flame for burning a flammable component of the waste stream; a flame detector for detecting the presence of a flame within the combustion chamber; and means for regulating the delivery of at least one process fluid to the process chamber when there is no flame present in the combustion chamber.
- a method of inhibiting the propagation of a flame front ignited by a pumping mechanism drawing a waste stream from a process chamber comprising the steps of: detecting a pressure at a location through which the waste stream is drawn by the pumping mechanism; and regulating the delivery of at least one process fluid to the process chamber when the detected pressure is greater than a pressure above which the flame front can be sustained by the waste stream.
- a method of inhibiting the propagation of a flame front ignited by a pumping mechanism drawing a waste stream from a process chamber comprising the steps of: detecting the presence of a flame in a combustion chamber for receiving the waste stream exhaust from the pumping mechanism; and regulating the delivery of at least one process fluid to the process chamber when there is no flame present in the combustion chamber.
- a method of inhibiting the propagation of a flame front ignited by a pumping mechanism of a vacuum pump drawing a waste stream from a process chamber comprising the steps of: detecting the presence of a flow of purge gas into the vacuum pump; and regulating the delivery of at least one process fluid to the process chamber when there is no purge gas being delivered.
- a method of initiating operation of a process system comprising a process chamber to which at least one process fluid is supplied through an inlet thereof; a vacuum pumping arrangement, connected by a foreline to an outlet of the process chamber, for drawing a waste stream from the process chamber; and a detector for detecting a failure condition of the system, the method comprising the steps of: powering up the system; detecting a first status signal indicative of a failure condition of the system from the detector to ensure that the detector is operational; subsequently initiating operation of the vacuum pumping arrangement; detecting a second status signal indicative of an operational condition of the system; and subsequently initiating delivery of a process fluid to the process chamber to permit a process therein to be initiated.
- Figure 1 illustrates schematically a first embodiment of an apparatus for inhibiting the propagation of a flame front ignited by a pumping mechanism drawing a waste stream from a process chamber;
- Figure 2 shows a second embodiment of an apparatus for inhibiting the propagation of a flame front ignited by a pumping mechanism drawing a waste stream from a process chamber;
- Figure 3 shows a detailed view of an inlet to a combustion chamber that may be used with the apparatus of Figure 1 ;
- Figure 4 shows a third embodiment of an apparatus for inhibiting the propagation of a flame front ignited by a pumping mechanism drawing a waste stream from a process chamber;
- Figure 5 illustrates a flow chart representing a two fault tolerant start up system associated with any of the aforementioned embodiments.
- Figure 1 illustrates a process chamber 10 having at least one fluid inlet 20 for introducing one or more process fluids, typically gases, to be used in the processing of a sample, for example a semiconductor wafer or a flat panel display device, contained therein.
- a shut off valve 25 is provided in the fluid inlet 20 for selectively interrupting the flow of fluid to the chamber 10.
- An outlet from the process chamber 10 is connected via a foreline 40 to an inlet of a vacuum pump 30 comprising a pumping mechanism suitable for drawing a waste stream from the process chamber 10.
- a pressure detector 45 is provided within either the foreline 40 (as shown) or within an inlet of the pump 30 for determining the local pressure in this region.
- a signal indicative of this foreline pressure is output from the pressure detector 45 to a controller 50.
- An exhaust of the vacuum pump 30 is connected, in turn, to an inlet of an abatement system 55 via pipe 60.
- the object of abatement is to convert one or more species of the waste stream into one or more different compounds that can be more conveniently disposed of, for example by a scrubber connected to an exhaust conduit 70 for conveying the waste stream from an outlet of the abatement system, or which can be safely exhausted to the atmosphere via exhaust conduit 70.
- a bypass line 80 is provided for directly connecting the pipe 60 to the exhaust conduit 70, thereby by-passing the abatement system 55 to permit the abatement system to be put on standby or even shut down during the intervals prior to and between processing within the chamber 10, thus reducing costs.
- a three way valve 90 is provided at the junction between the bypass line 80 and the pipe 60 to control whether a fluid path from the waste stream passes through the abatement system 55 or whether it is diverted through the bypass line 80. The activation of valve 90 is controlled by controller 50.
- a purge system 75 may be provided for introducing quantities of inert gas into the vacuum pump 30.
- the purge system 75 typically comprises one or more purge ports located along the length of the vacuum pump 30.
- a further purge port 65 for introducing an inert gas downstream of the vacuum pump 30 may be located within pipe 60, preferably between the exhaust of the vacuum pump 30 and the valve 90.
- Means for detecting a flowrate of purge gas into the vacuum pump 30 and/or into pipe 60 is preferably provided within the purge system 75.
- the abatement system 55 comprises a combustion chamber in which combustion of any flammable components of the waste stream takes place.
- a flame detector 95 is provided within the abatement system 55 for sensing whether there is a flame present inside the combustion chamber. A signal indicative of this condition is output from the flame detector 95 to the controller 50.
- the waste stream may comprise a flammable mixture. Consequently, a flammable atmosphere may be generated within the pump 30.
- Testing has been carried out on a typical vacuum pump 30 (a BOC Edwards iH160F pump) to confirm that that pump is capable of withstanding an initial internal explosion due to ignition of a region of flammable material. These tests showed that the pump is capable of enduring pressure loading twice the peak pressure experienced in a deflagration initiated when the pump is flooded with a stoichiometric flammable mixture under operating conditions.
- the conditions within the vacuum pump 30 may be such that a deflagration may occur if an ignition source is present. Where a flame front is generated by such a deflagration, this will be transmitted away from the source of ignition through the flammable atmosphere. The conditions encountered by the flame front will affect how the flame propagation proceeds.
- the flame front is being transmitted upstream into the foreline 40, it encounters a region of low pressure.
- this critical pressure is around 60 mbar, but for some mixtures may be as low as 1 mbar.
- the pressure in the foreline 40 of the pump 30 is generally maintained below this critical pressure. As the flame front encounters this low pressure region the flame front cannot be sustained and the flame is extinguished.
- the flame front is being transmitted downstream from the pump 30 it will travel down the pipe 60 and into the abatement system 55.
- the flame in the combustion chamber of the abatement system 55 ignites any flammable fluid that enters the chamber such that the waste stream exhausted from the abatement system 55 contains little, preferably no, flammable component. Consequently if the flame front propagates as far as the abatement system 55 the combustion chamber effectively acts as a flame arrester such that further propagation of the flame front is prevented and the flame is extinguished, since there is no fuel remaining to burn.
- inert gas may be introduced into the pipe 60 through purge port 65.
- This inert gas dilutes the flammable mixture to a concentration below that represented by the lower flammability limit thus providing a non-flammable atmosphere.
- a flame front propagates downstream of the pump 30 it will enter the nonflammable atmosphere in the pipe 60 and will be extinguished.
- a pressure detector 45 is located within the foreline 40 or at the inlet of the pump 30. This detector 45 outputs a signal indicative of its local pressure to the controller 50 which monitors the local pressure in this region to ensure that it remains below a predetermined value, typically the critical pressure required to sustain a flame front, as discussed above. Where this predetermined pressure is exceeded, then there is a risk that the flame front may be sustained within the foreline 40. In addition, if the flame within the combustion chamber of the abatement system 55 were to be extinguished for some reason, the flammable components of the waste stream would not be ignited and a flammable atmosphere would therefore be maintained. This flammable atmosphere would be capable of sustaining a flame front propagating through the abatement system 55 and into the exhaust conduit 70. As discussed above, the flame detector 95 outputs a signal to the controller 50 to confirm presence of the flame.
- a predetermined value typically the critical pressure required to sustain a flame front
- the valve 25 is provided at the inlet 20 of the process chamber 10 to enable the introduction of at least one process fluid into the process chamber 10 to be interrupted when necessary. Operation of the valve 25 is controlled by the controller 50. In the event that the predetermined pressure in the foreline 40 is exceeded, the flame in the combustion chamber has been extinguished or in the event that delivery of purge gas to the pump 30 has been interrupted, the controller 50 is configured to output a signal to the valve 25 to instruct the valve 25 to close, and thereby stop the flow of the process fluids to the chamber 10. By interrupting the flow of these fluids the concentration of the flammable mixture within the apparatus downstream from the process chamber 10 can be rapidly reduced below the lower explosive limit of the flammable mixture such that the risk of deflagration occurring is reduced.
- further mitigating action can be taken by the controller 50 in the form of an instruction to the purge system 75 to flood the pump 30 with inert gas to more rapidly reduce the concentration of the flammable mixture within the pump 30.
- a purge can be delivered to any part of the apparatus downstream from the process chamber 10 but would typically be delivered directly to the pump 30 through one of a number of standard purge ports formed in the stator of the pump or directly into pipe 60 leading from the exhaust of the pump 30 via purge port 65.
- further safety features can be introduced.
- the controller 50 can control the three- way valve 90 to close the bypass line 80 when the shut off valve 25 is open. In other words, when there is any chance of a flammable mixture being present in the apparatus the bypass line is closed, so that fluid must pass through the abatement system 55.
- the controller 50 can instruct the purge system 75 to cause inert gas to be delivered through purge port 65 such that the concentration of the flammable mixture within the pipe 60 is reduced below the lower flammable limit such that any incident flame front cannot be sustained in this region.
- the flammable waste stream contains condensable flammable gases.
- the pipe 60 presents an environment at elevated pressure and lower temperature than that found in the upstream part of the apparatus and thus provides conditions particularly suitable for condensation to form. Where pools of flammable liquid do form, these provide an unpredictable source of flammable material. A rate of release of flammable material from a pool depends upon the rate of evaporation of that liquid into the surrounding atmosphere which in turn depends on a number of factors including pressure and temperature of the region together with content and saturation level of any fluid present in gaseous form.
- a further problem associated with condensable flammable material is that where a totally gaseous mixture can be expected to pass through the apparatus in a predictable manner, pools of condensate may remain in the apparatus far longer.
- different processing steps carried out within the process chamber may incorporate incompatible materials.
- the process steps can be discretised such that a degree of certainty exists that one step is finished and the waste stream has been removed from the system before the next begins.
- pools of flammable liquid within the pipe 60 that continue to evaporate, these are still present when the next step of the process is initiated such that the incompatible materials are permitted to mix and react upon contact, within the pipe 60.
- a particular example of such a scenario is when a cleaning step follows a process step and the flammable mixture is combined with a material having a particularly high oxide content the combination of these materials can be particularly reactive.
- heating elements may be provided around pipe 60 to prevent cold spots from forming which may encourage the fluid to condense out. In this way the fluid exhausted from the pump 30 can be maintained in gaseous form.
- any purge gas to be delivered via the purge system 75 is preferably heated prior to delivery. In so doing, the waste stream avoids unnecessary cooling which, in turn, helps to avoid formation of condensates.
- a sensor for monitoring the temperature of the purge gas is preferably provided. A signal may be generated by the sensor in circumstances where the temperature of the purge gas reduces below a predetermined value.
- FIG. 2 illustrates how the vacuum pump 30 and the abatement system 55 may be contained within an enclosure 100 to prevent any flammable fluid leaking from that part of the apparatus from coming into contact with an external ignition source and causing a deflagration.
- the environment within this enclosure 100 may be controlled by forced extraction.
- a further detection unit, flow detector 105 is incorporated into an extraction duct 110 of the enclosure to detect the extraction rate of fluid therefrom.
- a signal indicative of the extraction rate is output from the flow detector 105 to the controller 50.
- the controller monitors the extraction rate and if the rate drops below a predetermined value during operation of the process chamber 10 then action discussed above can be initiated.
- the controller 50 may be replaced with hard wired connections between each of the detecting components 45, 95, 105 and valve components 25, 65, 90. Since the detecting and valve components are safety critical components, where possible, they are provided in a fail safe configuration and or redundancy is provided such that their functionality is duplicated in the arrangement.
- a further safety feature as illustrated in Figure 3 can be implemented in any of the above embodiments comprising an abatement system 55 having a combustion chamber.
- an abatement system 55 having a combustion chamber.
- any flammable components of the waste stream come into contact with the flame provided within the combustion chamber, they are incinerated, thus generating a non-flammable atmosphere.
- a flame front may propagate out of the inlet to the combustion chamber and into the pipe 60. This is commonly referred to as "flash back".
- a modified inlet may be provided which presents a restriction to the incident waste stream, thus causing it to speed up.
- the flame front initiated within the combustion chamber can be arrested at a location with a suitable aperture, which serves to anchor the flame front.
- a suitable aperture which serves to anchor the flame front.
- One particular example of such a device is a thin section metal cone 120 provided in the inlet of the combustion chamber, as illustrated in Figure 3. If a flame front were to anchor on the smaller aperture, the temperature of the cone would rapidly increase in the direction of increasing diameter. By providing a thermal sensor to the cone it is possible to detect flash back early to enable mitigating action to be carried out as described in detail above.
- the critical pressure can be as low as I Ombar for example those having a high hydrogen content in the presence of oxygen. In such circumstances it may be necessary to supplement the pumping capacity of the vacuum pump 30 to ensure that the pressure does not exceed the critical pressure. Alternatively, the thermal environment can be altered so that the value of the critical pressure is elevated.
- Figure 4 illustrates a third embodiment comprising a further vacuum pump 130, for example a booster pump, located in series with vacuum pump 30 and connected thereto by a conduit.
- the booster pump preferably comprises a Roots pumping mechanism.
- An additional pressure detector 145 is positioned in the conduit to enable a further indication of the status of each of the vacuum pumps 30, 130 to be provided to controller 50.
- Introduction of the further vacuum pump 130 not only potentially reduces the pressure in foreline 40 but also serves to quench the waste stream being drawn from the process chamber 10. Quenching cools the waste stream so that the value of critical pressure below which propagation of a flame front is sustained increases. Furthermore, were a flame front to propagate upstream from the pumping mechanism and enter the booster pump 130, the quenching action coupled with a restriction to the flow as presented by the close tolerances of a booster pump causes the booster pump 130 to effectively act as a flame arrester element.
- quenching alone would reduce the critical pressure to an extent that a further vacuum pump 130 was not required.
- quenching of the waste stream may be effected by alternative means either within or external to the foreline.
- cooled baffles, fingers or a cooling coil may be provided within the interior of the foreline or the external surface of the foreline may be cooled by using a cooling coil or a Peltier device.
- the detectors (45, 95, 145) can be used to enhance the safety of a start up procedure of the pump and the subsequent process to be carried out in the process chamber 10.
- the start up procedure is illustrated in the flow chart of Figure 5.
- each of the detectors ought to be recognising a non-fail or operational status. Once an operational status has been established throughout, the process may be initiated. As discussed above, in the event that any one of the detectors 45, 95, 145 subsequently indicates a "fail" status the process will be terminated by actuating valve 25 and stopping the delivery of one or more process fluids to the process chamber 10.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Incineration Of Waste (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Glass Compositions (AREA)
- Looms (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020077020425A KR101244492B1 (en) | 2005-03-07 | 2006-02-21 | Apparatus for inhibiting the propagation of a flame front |
JP2008500251A JP5502318B2 (en) | 2005-03-07 | 2006-02-21 | Device for preventing the propagation of the flame front |
AT06709828T ATE542053T1 (en) | 2005-03-07 | 2006-02-21 | APPARATUS AND METHOD FOR PREVENTING THE SPREAD OF A FLAME FRONT |
US11/885,720 US20080273995A1 (en) | 2005-03-07 | 2006-02-21 | Apparatus for Inhibiting the Propagation of a Flame Front |
EP06709828A EP1856416B1 (en) | 2005-03-07 | 2006-02-21 | Apparatus and method for inhibiting the propagation of a flame front |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB0504553.9A GB0504553D0 (en) | 2005-03-07 | 2005-03-07 | Apparatus for inhibiting the propagation of a flame front |
GB0504553.9 | 2005-03-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006095132A1 true WO2006095132A1 (en) | 2006-09-14 |
Family
ID=34451843
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2006/000592 WO2006095132A1 (en) | 2005-03-07 | 2006-02-21 | Apparatus for inhibiting the propagation of a flame front |
Country Status (8)
Country | Link |
---|---|
US (1) | US20080273995A1 (en) |
EP (1) | EP1856416B1 (en) |
JP (1) | JP5502318B2 (en) |
KR (1) | KR101244492B1 (en) |
AT (1) | ATE542053T1 (en) |
GB (1) | GB0504553D0 (en) |
TW (1) | TW200637629A (en) |
WO (1) | WO2006095132A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2150360A1 (en) * | 2007-05-25 | 2010-02-10 | Applied Materials, Inc. | Methods and apparatus for efficient operation of an abatement system |
WO2013144581A1 (en) * | 2012-03-26 | 2013-10-03 | Edwards Limited | Vacuum pump apparatus |
EP3112687A1 (en) * | 2015-06-29 | 2017-01-04 | Pfeiffer Vacuum Gmbh | Detection of the circulation of a flow of auxiliary gas that is supplied to a vacuum pump |
WO2018197834A1 (en) * | 2017-04-28 | 2018-11-01 | Edwards Limited | Vacuum pumping system |
GB2595938A (en) * | 2020-06-12 | 2021-12-15 | Edwards Ltd | Flammable gas dilution |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5748523B2 (en) * | 2011-03-30 | 2015-07-15 | エドワーズ株式会社 | Abatement equipment |
US9411341B2 (en) * | 2012-05-24 | 2016-08-09 | Globalfoundries Singapore Pte. Ltd. | Vacuum pump controller |
JP6685204B2 (en) * | 2016-08-26 | 2020-04-22 | 東京エレクトロン株式会社 | Safety device, safety system and method for making combustion abatement device safe |
US10690057B2 (en) | 2017-04-25 | 2020-06-23 | General Electric Company | Turbomachine combustor end cover assembly with flame detector sight tube collinear with a tube of a bundled tube fuel nozzle |
US11517831B2 (en) * | 2019-06-25 | 2022-12-06 | George Andrew Rabroker | Abatement system for pyrophoric chemicals and method of use |
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-
2005
- 2005-03-07 GB GBGB0504553.9A patent/GB0504553D0/en not_active Ceased
-
2006
- 2006-02-21 WO PCT/GB2006/000592 patent/WO2006095132A1/en active Application Filing
- 2006-02-21 US US11/885,720 patent/US20080273995A1/en not_active Abandoned
- 2006-02-21 EP EP06709828A patent/EP1856416B1/en not_active Not-in-force
- 2006-02-21 JP JP2008500251A patent/JP5502318B2/en not_active Expired - Fee Related
- 2006-02-21 AT AT06709828T patent/ATE542053T1/en active
- 2006-02-21 KR KR1020077020425A patent/KR101244492B1/en active IP Right Grant
- 2006-03-07 TW TW095107680A patent/TW200637629A/en unknown
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US4886444A (en) * | 1987-06-19 | 1989-12-12 | L'air Liquide | Process for treating gaseous effluents coming from the manufacture of electronic components and incineration apparatus for carrying out said process |
EP0332107A1 (en) * | 1988-03-07 | 1989-09-13 | Kabushiki Kaisha Toshiba | Turbomolecular pump and method of operating the same |
US6461113B1 (en) * | 1988-09-13 | 2002-10-08 | Helix Technology Corporation | Electronically controlled vacuum pump |
EP1039187A2 (en) * | 1999-03-19 | 2000-09-27 | The BOC Group plc | Improvements in flame arresters |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2150360A1 (en) * | 2007-05-25 | 2010-02-10 | Applied Materials, Inc. | Methods and apparatus for efficient operation of an abatement system |
EP2150360A4 (en) * | 2007-05-25 | 2013-01-23 | Applied Materials Inc | Methods and apparatus for efficient operation of an abatement system |
WO2013144581A1 (en) * | 2012-03-26 | 2013-10-03 | Edwards Limited | Vacuum pump apparatus |
EP2831423B1 (en) | 2012-03-26 | 2020-07-01 | Edwards Limited | Vacuum pump system |
EP3112687A1 (en) * | 2015-06-29 | 2017-01-04 | Pfeiffer Vacuum Gmbh | Detection of the circulation of a flow of auxiliary gas that is supplied to a vacuum pump |
WO2018197834A1 (en) * | 2017-04-28 | 2018-11-01 | Edwards Limited | Vacuum pumping system |
CN110537023A (en) * | 2017-04-28 | 2019-12-03 | 爱德华兹有限公司 | Vacuum pumping system |
KR20200003377A (en) * | 2017-04-28 | 2020-01-09 | 에드워즈 리미티드 | Vacuum pump system |
GB2561899B (en) * | 2017-04-28 | 2020-11-04 | Edwards Ltd | Vacuum pumping system |
KR102609261B1 (en) * | 2017-04-28 | 2023-12-04 | 에드워즈 리미티드 | vacuum pump system |
US11839903B2 (en) | 2017-04-28 | 2023-12-12 | Edwards Limited | Vacuum pumping system |
GB2595938A (en) * | 2020-06-12 | 2021-12-15 | Edwards Ltd | Flammable gas dilution |
Also Published As
Publication number | Publication date |
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EP1856416A1 (en) | 2007-11-21 |
ATE542053T1 (en) | 2012-02-15 |
EP1856416B1 (en) | 2012-01-18 |
JP2008531979A (en) | 2008-08-14 |
KR101244492B1 (en) | 2013-03-18 |
KR20070110071A (en) | 2007-11-15 |
JP5502318B2 (en) | 2014-05-28 |
TW200637629A (en) | 2006-11-01 |
US20080273995A1 (en) | 2008-11-06 |
GB0504553D0 (en) | 2005-04-13 |
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