EP0129709A2 - Combinational molecular pump capable of readily being cleaned - Google Patents
Combinational molecular pump capable of readily being cleaned Download PDFInfo
- Publication number
- EP0129709A2 EP0129709A2 EP84105770A EP84105770A EP0129709A2 EP 0129709 A2 EP0129709 A2 EP 0129709A2 EP 84105770 A EP84105770 A EP 84105770A EP 84105770 A EP84105770 A EP 84105770A EP 0129709 A2 EP0129709 A2 EP 0129709A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylindrical member
- pump
- molecular pump
- center axis
- additional
- 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- Withdrawn
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Classifications
-
- 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
- F04D19/046—Combinations of two or more different types of pumps
Definitions
- This invention relates to a molecular pump for use in evacuating a space to be exhausted to an ultra-high vacuum. It is to be noted here throughout the instant specification that the molecular pump comprises a combination of a molecular pump member of an axial-flow type with an additional molecular pump member having a helical groove.
- the molecular pump comprises a pump vessel of a cylindrical shape which has a center axis, an inner surface defining a hollow space along the center axis, an inlet port, and an outlet port.
- the molecular pump further comprises a first pump member operable as the molecular pump member of an axial-flow type within the hollow space.
- the first pump member is disposed nearer to the inlet port than the outlet port.
- a second pump member is operable as the additional molecular pump member and has a helical groove in communication with the hollow space.
- the second pump member is positioned nearer to the outlet port than • the inlet port.
- the first pump member comprises a plurality of rotor blade members rotatable around the center axis and a plurality of stator blade members held on the inner surface with the rotor blade members alternately interposed.
- the second pump member comprises an inside cylindrical member and an outside cylindrical member held on the inner surface and having an inner peripheral surface parallel to the center axis.
- the inner peripheral surface faces the hollow space.
- the inside cylindrical member has an outer peripheral surface rotatable around the center axis with a predetermined distance left in the hollow space from the inner peripheral surface. It is possible the to form the helical groove into either of the inner andfouter peripheral surfaces.
- the stator blade members and the outside cylindrical member are fixed to the inner surface of the pump vessel by pressing the pump vessel onto a pump base member which is for use in supporting the molecular pump.
- the gas to be evacuated includes dust and/or a substance which changes into a solid.
- dust and solids adhere as a deposit onto the inner peripheral surface of the outside cylindrical member at a location nearer to the outlet port.
- the deposit reduces the ultimate degree of vacuum and the speed of exhaust. It is therefore necessary to often clean the molecular pump. More particularly, the deposit should be removed by taking the molecular pump to pieces after the molecular pump is operated for a long time. The molecular pump is taken to pieces by upwardly pulling out the pump vessel from the pump base member at first, next removing the stator blade members away from the rotor blade members, and then upwardly pulling out the outside cylindrical member. However, it is difficult to pull out the outside cylindrical member when the deposit has grown bulky.
- a molecular pump to which this invention is applicable comprises a pump vessel which has a center axis and an inner surface defining a hollow space along the center axis and which has an inlet port and an outlet port in communication with the hollow space, a first pump member comprising a plurality of rotor blade members rotatable around the center axis in the hollow space near the inlet port and a plurality of stator blade members held on the inner surface members with the rotor blade alternately interposed, and a second pump member comprising an inside cylindrical member near the outlet port and an outside cylindrical member held on said inner surface and having an inner peripheral surface parallel to the center axis and in a face to face relationship relative to the hollow space.
- the inside cylindrical member has an outer peripheral surface rotatable around the center axis with a predetermined distance left in the hollow space from the inner peripheral surface. Either of the inner and the outer peripheral surfaces is provided with a helical groove. According to this invention, the outside cylindrical member is brought into contact with an additional cylindrical member situated nearer to the outlet port than the inside cylindrical member and cut into radially a plurality of separate pieces each of which is/detachable from another.
- the molecular pump comprises a pump vessel 11 of a cylindrical shape.
- the pump vessel 11 has a center axis 12, an inner surface defining a hollow space along the center axis 12, an inlet port 13, and an outlet port 14.
- a first pump member 20 is operable as a molecular pump member of an axial-flow type within the hollow space.
- the first pump member 20 comprises a plurality of rotor blade members 21 rotatable around the center axis 12 in the hollow space nearer to the inlet port 13 than the outlet port 14.
- the rotor blade members 21 are stacked from one another with a gap left between two adjacent ones of the rotor blade members 21.
- Each of the rotor blade members 21 has a plurality of rotor blades in the manner known in the art.
- the first pump member 20 further comprises a plurality of stator blade member 22 held on the inner surface by a plurality of spacers 23, respectively, with the stator blade members 22 interposed between each gap left between two adjacent rotor blade members 21.
- Each of the stator blade members 22 also has a plurality of stator blades in the manner known in the art.
- the second pump member 30 comprises an inside cylindrical member 31 nearer to the outlet port 14 than the inlet port 13 and an outside cylindrical member 32 held on or snugly received by the inner surface of the pump vessel 11.
- the outside cylindrical member 32 has an inner peripheral surface parallel to the center axis 12.
- the inner peripheral surface is in a face to face relationship relative to the hollow space.
- the inside cylindrical member 31 has an outer peripheral surface rotatable around the center axis 12 with a predetermined distance left in the hollow space from the inner peripheral surface of the outside cylindrical member 32.
- the inner peripheral surface of the outside cylindrical member 32 is provided with a helical groove 33 having predetermined depth, width and pitch.
- the stator blade members 22 and the outside cylindrical member 32 are fixed to the inner surface of the pump vessel 11 by pressing the pump vessel 11 onto a pump base member 40.
- the pump base member 40 is for use in supporting the molecular pump.
- the pump base member 40 has an exhaust pipe 41 which communicates with the outlet port 14 of the pump vessel 11.
- the molecular pump is attached at the inlet port 13 to a device which is to be evacuated.
- a forepump is coupled with the exhaust port 41 in order to evacuate to a fore-vacuum.
- a gas is evacuated from the device through the exhaust port 41 during operation of the first and the second pump members 20 and 30.
- the gas to be evacuated includes dust and/or a substance readily solidified.
- dust and solidified substance adhere as a deposit 50 onto the inner peripheral surface of the outside cylindrical member 32 at a location nearer to the outlet port 14.
- the deposit 50 reduces the ultimate degree of vacuum and the speed of exhaust. Therefore, the molecular pump should often be cleaned or swept so as to remove the deposit 50. Such cleaning is very cumbersome. More particularly, the molecular pump must be disassembled into pieces on cleaning in the following manner. At first, the pump vessel 11 is detached from the pump base member 40 by upwardly pulling out the pump vessel 11. Subsequently, the spacers 23 and the stator blade members 22 are removed from the rotor blade members 21.
- the outside cylindrical member 32 is upwardly pulled out to be detached from the pump base member 4 0.
- the detached elements should be assembled in position.
- the inside cylindrical member 31 must be precisely positioned because the inside cylindrical member 31 is rotated at a high speed and is therefore accurately balanced.
- a modified molecular pump be tentatively considered to remove the defect.
- the inner peripheral surface of the outside cylindrical member 32 is given a greater diameter at a portion of the deposit 50 than the remaining inner peripheral surface.
- the deposit 50 adheres onto the inner peripheral surface of the outside cylindrical member 32 so as to protrude inwardly over the outer peripheral surface of the inside cylindrical member 31 at a location nearer to the bottom end of the inside cylindrical member 31, as illustrated in Fig. 2.
- the deposit 50 tenaciously adheres also to the pump base member 40. It is therefore impossible with the modified molecular pump to pull out the outside cylindrical member 32 without detaching the inside cylindrical member 31.
- a molecular pump according to a first embodiment of this invention comprises similar parts designated by like reference numerals.
- the outside cylindrical member 11 is brought into contact with an additional cylindrical member 32a situated nearer to the outlet port 14 than the inside cylindrical member 31.
- the additional cylindrical member 32a is cut into a plurality of separate pieces each of which is detachable from another away from the center axis 12.
- the additional cylindrical member 32a is separable from the outside cylindrical member 32.
- the additional cylindrical member 32a is cut into separate pieces along at least two lines.
- the line may have an angle with the center axis 12.
- the lines semicircular are parallel in effect to the center axis 12 so that the separate radially pieces are/detachable from each other away from the center axis 12.
- the molecular pump of Fig. 3 When the molecular pump of Fig. 3 is to be cleaned or swept, the molecular pump is disassembled by upwardly pulling out the pump vessel 11 from the pump base member 40 at first, by removing the spacers 23 and the stator blade members 22 away from the rotor blade members 21, by pulling out the outside cylindrical member 32, and then by detaching the additional cylindrical member 32a.
- the molecular pump of Fig. 3 can be readily cleaned or swept to remove the deposit 50.
- a molecular pump according to a second embodiment of this invention comprises similar parts designated by like reference numerals.
- the helical groove 33' is formed on the outer peripheral surface of the inside cylindrical member 31'.
- the outside cylindrical member 32' is integral with the additional cylindrical member 32a situated nearer to the outlet port 14 than the inside cylindrical member 31'. Consequently, the additional cylindrical member 32a is brought into contact with the outside cylindrical member 32', like in Fig. 3. As will presently be described, the illustrated outside cylindrical member 32' is cut into a plurality of separate pieces, as is the case with the additional cylindrical member 32a illustrated in Fig. 3. Each of radially the separate pieces is/detachable from another.
- the outside cylindrical member 32' made integral with the additional cylindrical member 32a comprises two pieces each of which is separable from another and which is of a semicircle. Each piece has a pair of ends brought into contact with those of the other piece. As mentioned in conjunction with Fig. 4, the separate pieces can be manufactured by cutting a cylindrical member serving as the outside cylindrical member 32' and the additional cylindrical member 32a.
- the molecular pump of Fig. 5 it is also possible to clean the molecular pump in order to remove the deposit 50 by separating the outside cylindrical member 32' made integral with the additional cylindrical member 32a.
- the molecular pump of Fig. 5 can be readily cleaned or swept to remove the deposit 50.
Abstract
Description
- This invention relates to a molecular pump for use in evacuating a space to be exhausted to an ultra-high vacuum. It is to be noted here throughout the instant specification that the molecular pump comprises a combination of a molecular pump member of an axial-flow type with an additional molecular pump member having a helical groove.
- In Japanese Patent Publication No. 33446/1972, such a molecular pump is disclosed. The molecular pump comprises a pump vessel of a cylindrical shape which has a center axis, an inner surface defining a hollow space along the center axis, an inlet port, and an outlet port. The molecular pump further comprises a first pump member operable as the molecular pump member of an axial-flow type within the hollow space. The first pump member is disposed nearer to the inlet port than the outlet port. A second pump member is operable as the additional molecular pump member and has a helical groove in communication with the hollow space. The second pump member is positioned nearer to the outlet port than • the inlet port. The first pump member comprises a plurality of rotor blade members rotatable around the center axis and a plurality of stator blade members held on the inner surface with the rotor blade members alternately interposed. The second pump member comprises an inside cylindrical member and an outside cylindrical member held on the inner surface and having an inner peripheral surface parallel to the center axis. The inner peripheral surface faces the hollow space. The inside cylindrical member has an outer peripheral surface rotatable around the center axis with a predetermined distance left in the hollow space from the inner peripheral surface. It is possible the to form the helical groove into either of the inner andfouter peripheral surfaces. The stator blade members and the outside cylindrical member are fixed to the inner surface of the pump vessel by pressing the pump vessel onto a pump base member which is for use in supporting the molecular pump.
- It is general that the gas to be evacuated includes dust and/or a substance which changes into a solid. Such dust and solids adhere as a deposit onto the inner peripheral surface of the outside cylindrical member at a location nearer to the outlet port. The deposit reduces the ultimate degree of vacuum and the speed of exhaust. It is therefore necessary to often clean the molecular pump. More particularly, the deposit should be removed by taking the molecular pump to pieces after the molecular pump is operated for a long time. The molecular pump is taken to pieces by upwardly pulling out the pump vessel from the pump base member at first, next removing the stator blade members away from the rotor blade members, and then upwardly pulling out the outside cylindrical member. However, it is difficult to pull out the outside cylindrical member when the deposit has grown bulky. It is necessary in such a case to detach the inside cylindrical member before pulling out the outside cylindrical member. However, it needs much time and great expense to again install the inside cylindrical member in position. This is because precise control is necessary so as to balance the inside cylindrical member, which is rotated at high speed. Thus, the conventional molecular pump can not be readily swept or cleaned.
- It is therefore an object of this invention to provide a molecular pump which can be readily swept or cleaned.
- It is another object of this invention to provide a molecular pump which can save time and labor on cleaning.
- A molecular pump to which this invention is applicable comprises a pump vessel which has a center axis and an inner surface defining a hollow space along the center axis and which has an inlet port and an outlet port in communication with the hollow space, a first pump member comprising a plurality of rotor blade members rotatable around the center axis in the hollow space near the inlet port and a plurality of stator blade members held on the inner surface members with the rotor blade alternately interposed, and a second pump member comprising an inside cylindrical member near the outlet port and an outside cylindrical member held on said inner surface and having an inner peripheral surface parallel to the center axis and in a face to face relationship relative to the hollow space. The inside cylindrical member has an outer peripheral surface rotatable around the center axis with a predetermined distance left in the hollow space from the inner peripheral surface. Either of the inner and the outer peripheral surfaces is provided with a helical groove. According to this invention, the outside cylindrical member is brought into contact with an additional cylindrical member situated nearer to the outlet port than the inside cylindrical member and cut into radially a plurality of separate pieces each of which is/detachable from another.
-
- Fig. 1 is a partial vertical sectional view of a conventional molecular pump;
- Fig. 2 is a partial vertical sectional view of a modified molecular pump;
- Fig. 3 is a partial vertical sectional view of a molecular pump according to a first embodiment of the instant invention;
- Fig. 4 is a perspective view of an additional cylindrical member for use in the molecular pump depicted in Fig. 3;
- Fig. 5 is a partial vertical sectional view of a molecular pump according to a second embodiment of this invention; and
- Fig. 6 is a perspective view of an outside cylindrical member used in the molecular pump illustrated in Fig. 5.
- Referring to Fig. 1, a conventional molecular pump will be described at first for a better understanding of this invention. The molecular pump comprises a
pump vessel 11 of a cylindrical shape. Thepump vessel 11 has acenter axis 12, an inner surface defining a hollow space along thecenter axis 12, aninlet port 13, and anoutlet port 14. - A
first pump member 20 is operable as a molecular pump member of an axial-flow type within the hollow space. Thefirst pump member 20 comprises a plurality ofrotor blade members 21 rotatable around thecenter axis 12 in the hollow space nearer to theinlet port 13 than theoutlet port 14. Therotor blade members 21 are stacked from one another with a gap left between two adjacent ones of therotor blade members 21. Each of therotor blade members 21 has a plurality of rotor blades in the manner known in the art. Thefirst pump member 20 further comprises a plurality ofstator blade member 22 held on the inner surface by a plurality ofspacers 23, respectively, with thestator blade members 22 interposed between each gap left between two adjacentrotor blade members 21. Each of thestator blade members 22 also has a plurality of stator blades in the manner known in the art. - An additional molecular pump member of a helical groove type cooperates with the
first pump member 20 and may be referred to as asecond pump member 30. Thus, the illustrated pump may be called a combinational molecular pump. Thesecond pump member 30 comprises an insidecylindrical member 31 nearer to theoutlet port 14 than theinlet port 13 and an outsidecylindrical member 32 held on or snugly received by the inner surface of thepump vessel 11. The outsidecylindrical member 32 has an inner peripheral surface parallel to thecenter axis 12. The inner peripheral surface is in a face to face relationship relative to the hollow space. The insidecylindrical member 31 has an outer peripheral surface rotatable around thecenter axis 12 with a predetermined distance left in the hollow space from the inner peripheral surface of the outsidecylindrical member 32. The inner peripheral surface of the outsidecylindrical member 32 is provided with ahelical groove 33 having predetermined depth, width and pitch. - Let this pump be seen from a top thereof in Fig. 1 and the
helical groove 33 form a right-handed screw. Under the circumstances, the insidecylindrical member 31 is rotated clockwise around thecenter axis 12. On the contrary, the insidecylindrical member 31 is rotated counterclockwise around thecenter axis 12 when thehelical groove 33 may form a left-handed screw. - The
stator blade members 22 and the outsidecylindrical member 32 are fixed to the inner surface of thepump vessel 11 by pressing thepump vessel 11 onto apump base member 40. Thepump base member 40 is for use in supporting the molecular pump. Thepump base member 40 has anexhaust pipe 41 which communicates with theoutlet port 14 of thepump vessel 11. - The molecular pump is attached at the
inlet port 13 to a device which is to be evacuated. A forepump is coupled with theexhaust port 41 in order to evacuate to a fore-vacuum. A gas is evacuated from the device through theexhaust port 41 during operation of the first and thesecond pump members - As a rule, the gas to be evacuated includes dust and/or a substance readily solidified. Such dust and solidified substance adhere as a
deposit 50 onto the inner peripheral surface of the outsidecylindrical member 32 at a location nearer to theoutlet port 14. Thedeposit 50 reduces the ultimate degree of vacuum and the speed of exhaust. Therefore, the molecular pump should often be cleaned or swept so as to remove thedeposit 50. Such cleaning is very cumbersome. More particularly, the molecular pump must be disassembled into pieces on cleaning in the following manner. At first, thepump vessel 11 is detached from thepump base member 40 by upwardly pulling out thepump vessel 11. Subsequently, thespacers 23 and thestator blade members 22 are removed from therotor blade members 21. Then, the outsidecylindrical member 32 is upwardly pulled out to be detached from the pump base member 40. However, it is difficult to pull out the outsidecylindrical member 32 when thedeposit 50 has grown bulky. In such a case, it is necessary to detach the insidecylindrical member 31 from thepump base member 40 before the outsidecylindrical member 32 is pulled out. After cleaning, the detached elements should be assembled in position. Among others, the insidecylindrical member 31 must be precisely positioned because the insidecylindrical member 31 is rotated at a high speed and is therefore accurately balanced. Anyway, much labor and time are consumed on cleaning. - Referring to Fig. 2, let a modified molecular pump be tentatively considered to remove the defect. According to the modification, the inner peripheral surface of the outside
cylindrical member 32 is given a greater diameter at a portion of thedeposit 50 than the remaining inner peripheral surface. We expected that the outsidecylindrical member 32 can be pulled out without detaching the insidecylindrical member 31 even if thedeposit 50 may protrude towards the center axis. However, it has been found according to our experiment that thedeposit 50 adheres onto the inner peripheral surface of the outsidecylindrical member 32 so as to protrude inwardly over the outer peripheral surface of the insidecylindrical member 31 at a location nearer to the bottom end of the insidecylindrical member 31, as illustrated in Fig. 2. In addition, it has been confirmed that thedeposit 50 tenaciously adheres also to thepump base member 40. It is therefore impossible with the modified molecular pump to pull out the outsidecylindrical member 32 without detaching the insidecylindrical member 31. - Referring to Fig. 3, a molecular pump according to a first embodiment of this invention comprises similar parts designated by like reference numerals. The outside
cylindrical member 11 is brought into contact with an additionalcylindrical member 32a situated nearer to theoutlet port 14 than the insidecylindrical member 31. As will presently be described, the additionalcylindrical member 32a is cut into a plurality of separate pieces each of which is detachable from another away from thecenter axis 12. The additionalcylindrical member 32a is separable from the outsidecylindrical member 32. - Referring to Fig. 4, the additional
cylindrical member 32a is cut into separate pieces along at least two lines. The line may have an angle with thecenter axis 12. At any rate, the lines semicircular are parallel in effect to thecenter axis 12 so that the separate radially pieces are/detachable from each other away from thecenter axis 12. - When the molecular pump of Fig. 3 is to be cleaned or swept, the molecular pump is disassembled by upwardly pulling out the
pump vessel 11 from thepump base member 40 at first, by removing thespacers 23 and thestator blade members 22 away from therotor blade members 21, by pulling out the outsidecylindrical member 32, and then by detaching the additionalcylindrical member 32a. Inasmuch as the outsidecylindrical member 32 and the additionalcylindrical member 32a are disassembled without detaching the insidecylindrical member 31 from thecenter axis 12 even when thedeposit 50 is highly piled up in the additionalcylindrical member 32a, the molecular pump of Fig. 3 can be readily cleaned or swept to remove thedeposit 50. Thus, it is possible to save time and labor on cleaning the molecular pump. Furthermore, it is easy to again install the additionalcylindrical member 32a, the outsidecylindrical member 32, thestator blade members 22, thespacers 23 and thepump vessel 11 in position, as the insidecylindrical member 31 is not detached. - Referring to Fig. 5, a molecular pump according to a second embodiment of this invention comprises similar parts designated by like reference numerals. The helical groove 33' is formed on the outer peripheral surface of the inside cylindrical member 31'.
- Let the helical groove 33' form a left-handed screw when seen from top of this figure. In this event, the inside cylindrical member 31' is rotated clockwise around the
center axis 12. On the contrary, the inside cylindrical member 31' is rotated counterclockwise around thecenter axis 12 when the helical groove 33' forms a right-handed screw. - The outside cylindrical member 32' is integral with the additional
cylindrical member 32a situated nearer to theoutlet port 14 than the inside cylindrical member 31'. Consequently, the additionalcylindrical member 32a is brought into contact with the outside cylindrical member 32', like in Fig. 3. As will presently be described, the illustrated outside cylindrical member 32' is cut into a plurality of separate pieces, as is the case with the additionalcylindrical member 32a illustrated in Fig. 3. Each of radially the separate pieces is/detachable from another. - Referring to Fig. 6, the outside cylindrical member 32' made integral with the additional
cylindrical member 32a comprises two pieces each of which is separable from another and which is of a semicircle. Each piece has a pair of ends brought into contact with those of the other piece. As mentioned in conjunction with Fig. 4, the separate pieces can be manufactured by cutting a cylindrical member serving as the outside cylindrical member 32' and the additionalcylindrical member 32a. - According to the molecular pump of Fig. 5, it is also possible to clean the molecular pump in order to remove the
deposit 50 by separating the outside cylindrical member 32' made integral with the additionalcylindrical member 32a. Thus, the molecular pump of Fig. 5 can be readily cleaned or swept to remove thedeposit 50. Thus, it is possible to save time and labor on cleaning of the molecular pump. - While the present invention has thus far been described in conjunction with a few preferred embodiments thereof, it will now be readily possible for those skilled in the art to practice this invention in various other manners. For example, it is possible to form the
helical groove 33 or 33' into either of the inner and the outer peripheral surfaces. The additionalcylindrical member 32a or the outside cylindrical member 32'may be divided into separate pieces more than two.
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58073706A JPS591818A (en) | 1982-04-29 | 1983-04-26 | Starter wheel gear-ignition target type clutch particularly for automobile |
JP73706/83 | 1983-05-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0129709A2 true EP0129709A2 (en) | 1985-01-02 |
EP0129709A3 EP0129709A3 (en) | 1985-03-06 |
Family
ID=13525925
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84105770A Withdrawn EP0129709A3 (en) | 1983-04-26 | 1984-05-21 | Combinational molecular pump capable of readily being cleaned |
Country Status (1)
Country | Link |
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EP (1) | EP0129709A3 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2597552A1 (en) * | 1986-04-19 | 1987-10-23 | Pfeiffer Vakuumtechnik | MOLECULAR VACUUM PUMP, ESPECIALLY OF THE TURBOMOLECULAR TYPE |
EP0256234A2 (en) * | 1986-06-12 | 1988-02-24 | Hitachi, Ltd. | Vacuum generating system |
EP0283736A2 (en) * | 1987-02-24 | 1988-09-28 | ALCATEL HOCHVAKUUMTECHNIK GmbH | High vacuum pump with a bell-shaped rotor |
JPH01124396U (en) * | 1988-02-17 | 1989-08-24 | ||
US5049168A (en) * | 1988-09-12 | 1991-09-17 | Philip Danielson | Helium leak detection method and system |
EP0695872A1 (en) * | 1994-08-01 | 1996-02-07 | Balzers-Pfeiffer GmbH | Friction vacuum pump with magnetic bearings |
EP0751297A1 (en) * | 1995-06-30 | 1997-01-02 | Alcatel Cit | Turbo molecular pump |
EP1160459A2 (en) * | 2000-06-02 | 2001-12-05 | The BOC Group plc | Vacuum pump |
EP1039137A3 (en) * | 1999-03-23 | 2002-03-13 | Ebara Corporation | Turbo-molecular pump |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2218615A1 (en) * | 1972-04-18 | 1973-10-31 | Leybold Heraeus Gmbh & Co Kg | TURBOMOLECULAR PUMP WITH ROTOR AND STATOR |
DD129822A1 (en) * | 1976-12-20 | 1978-02-08 | Harry Werner | STATOR FOR A TURBOMOLECULAR PUMP |
-
1984
- 1984-05-21 EP EP84105770A patent/EP0129709A3/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2218615A1 (en) * | 1972-04-18 | 1973-10-31 | Leybold Heraeus Gmbh & Co Kg | TURBOMOLECULAR PUMP WITH ROTOR AND STATOR |
DD129822A1 (en) * | 1976-12-20 | 1978-02-08 | Harry Werner | STATOR FOR A TURBOMOLECULAR PUMP |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2597552A1 (en) * | 1986-04-19 | 1987-10-23 | Pfeiffer Vakuumtechnik | MOLECULAR VACUUM PUMP, ESPECIALLY OF THE TURBOMOLECULAR TYPE |
EP0256234A2 (en) * | 1986-06-12 | 1988-02-24 | Hitachi, Ltd. | Vacuum generating system |
EP0256234A3 (en) * | 1986-06-12 | 1989-11-23 | Hitachi, Ltd. | Vacuum generating system |
EP0283736A2 (en) * | 1987-02-24 | 1988-09-28 | ALCATEL HOCHVAKUUMTECHNIK GmbH | High vacuum pump with a bell-shaped rotor |
EP0283736A3 (en) * | 1987-02-24 | 1989-03-08 | ALCATEL HOCHVAKUUMTECHNIK GmbH | High vacuum pump with a bell-shaped rotor |
JPH01124396U (en) * | 1988-02-17 | 1989-08-24 | ||
US5049168A (en) * | 1988-09-12 | 1991-09-17 | Philip Danielson | Helium leak detection method and system |
EP0695872A1 (en) * | 1994-08-01 | 1996-02-07 | Balzers-Pfeiffer GmbH | Friction vacuum pump with magnetic bearings |
EP0751297A1 (en) * | 1995-06-30 | 1997-01-02 | Alcatel Cit | Turbo molecular pump |
FR2736103A1 (en) * | 1995-06-30 | 1997-01-03 | Cit Alcatel | TURBOMOLECULAR PUMP |
US5722819A (en) * | 1995-06-30 | 1998-03-03 | Alcatel Cit | Molecular drag pump |
EP1039137A3 (en) * | 1999-03-23 | 2002-03-13 | Ebara Corporation | Turbo-molecular pump |
US6585480B2 (en) | 1999-03-23 | 2003-07-01 | Ebara Corporation | Turbo-molecular pump |
EP1160459A2 (en) * | 2000-06-02 | 2001-12-05 | The BOC Group plc | Vacuum pump |
EP1160459A3 (en) * | 2000-06-02 | 2003-01-22 | The BOC Group plc | Vacuum pump |
US6626639B2 (en) | 2000-06-02 | 2003-09-30 | The Boc Group Plc | Vacuum pump |
Also Published As
Publication number | Publication date |
---|---|
EP0129709A3 (en) | 1985-03-06 |
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