EP1609990B1 - Vacuum device and vacuum pump - Google Patents
Vacuum device and vacuum pump Download PDFInfo
- Publication number
- EP1609990B1 EP1609990B1 EP04716009A EP04716009A EP1609990B1 EP 1609990 B1 EP1609990 B1 EP 1609990B1 EP 04716009 A EP04716009 A EP 04716009A EP 04716009 A EP04716009 A EP 04716009A EP 1609990 B1 EP1609990 B1 EP 1609990B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- vacuum
- auxiliary
- vacuum pump
- pumps
- 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.)
- Expired - Fee Related
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- 239000007789 gas Substances 0.000 claims description 29
- 238000009792 diffusion process Methods 0.000 claims description 8
- 239000011261 inert gas Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 16
- 238000004519 manufacturing process Methods 0.000 description 11
- 239000004065 semiconductor Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 235000012431 wafers Nutrition 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/14—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/005—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 dissimilar working principle
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
- F04F5/20—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids for evacuating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/54—Installations characterised by use of jet pumps, e.g. combinations of two or more jet pumps of different type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- 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
- F04C18/14—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 toothed rotary pistons
- F04C18/16—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 toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2220/00—Application
- F04C2220/10—Vacuum
- F04C2220/12—Dry running
Definitions
- Vacuum apparatuses have been used in the semiconductor manufacturing field and many other industrial fields.
- the vacuum apparatuses each generally comprise a vacuum chamber and a vacuum pump for keeping the inside of the vacuum chamber in a vacuum or pressure-reduced state.
- the vacuum apparatus is disposed in a clean room and is configured to perform predetermined processing while introducing and exhausting a predetermined process gas into and from the vacuum chamber.
- FIG. 1 description will be given of one example of a conventional vacuum apparatus employed in a semiconductor manufacturing system.
- This vacuum apparatus comprises a plurality of reaction chambers (vacuum chambers) 10, 11, and 12, high vacuum pumps 1, 2, and 3 as first vacuum pumps one or a plurality of which are arranged for each of the reaction chambers 10, 11, and 12 in order to bring the inside thereof into a pressure-reduced or vacuum state, and booster pumps 4a, 5a, and 6a as second vacuum pumps and back pumps 4b, 5b, and 6b as third vacuum pumps that are arranged at subsequent stages of the high vacuum pumps, respectively.
- valves 22, 23, and 24 are provided between the high vacuum pumps 1, 2, and 3 and the booster pumps 4a, 5a, and 6a, respectively.
- load lock chambers 13 and 14 for transferring processing objects such as wafers to the reaction chambers 10, 11, and 12 and a transfer chamber 15 provided therein with a robot (transfer apparatus) that transfers the processing objects, brought into the load lock chamber 13, into the reaction chambers 10, 11, and 12 and transfers them from the reaction chambers 10, 11, and 12 into the load lock chamber 14.
- robot transfer apparatus
- a booster pump 8a and a back pump 8b are connected to the load lock chamber 13
- a booster pump 7a and a back pump 7b are connected to the load lock chamber 14
- a booster pump 9a and a back pump 9b are connected to the transfer chamber 15, thereby being capable of bringing those chambers into pressure-reduced or vacuum states, respectively.
- reaction chambers 10, 11, and 12 are each provided with a gas inlet and heating means such as a heater to thereby carry out predetermined processing such as film formation while introducing a predetermined gas under heating.
- symbols A1 denote pipes between the high vacuum pumps 1, 2, and 3 and the booster pumps 4a, 5a, and 6a, respectively
- symbols A2 denote pipes between the reaction chambers 10, 11, and 12 and the high vacuum pumps 1, 2, and 3, respectively.
- symbol R denotes a clean room.
- a cassette with a plurality of processing objects such as wafers placed therein is brought into the load lock chamber 13 from the atmosphere outside the apparatus and the load lock chamber 13 is exhausted.
- a gate valve (not illustrated) between the load lock chamber 13 and the transfer chamber 15 is opened and the processing object transfer robot uses its transfer arm to pick up one of the processing objects from the cassette and transfer it into the transfer chamber 15.
- a gate valve (not illustrated) between the reaction chamber 10 and the transfer chamber 15 is opened and the processing object is placed on a stage in the reaction chamber 10 by the use of the transfer arm.
- the processed object is transferred into the other reaction chamber 11 or 12 or the load lock chamber 14 by the use of the transfer arm.
- the processed object is finally transferred to the exterior from the load lock chamber 14.
- the high vacuum pump of a high vacuum pump that operates in the molecular area of ultimate vacuum (10 -7 torr or less).
- a turbomolecular pump or a thread groove pump is generally used as the high vacuum pump.
- the turbomolecular pump and the thread groove pump each generally have a low allowable back pressure of 1 torr or less (specifically 0.5 torr or less and more specifically about 0.4 torr) while the pumping speed is high even with a small size. Therefore, there is/are provided, at the subsequent stage of the high vacuum pump, an intermediate/low vacuum pump or intermediate/low vacuum pumps in one or two stages which each operate at a relatively low back pressure while the ultimate vacuum is relatively low.
- a booster pump or the like is provided subsequent to the high vacuum pump as an intermediate vacuum pump and, further, a Roots pump or the like is provided subsequent to the booster pump as a low vacuum pump that operates at a relatively low back pressure while the ultimate vacuum is low.
- a vacuum apparatus of this type having a plurality of stages of vacuum pumps for use in the semiconductor device manufacturing field is disclosed, for example, in Japanese Unexamined Patent Application Publication (JP-A) No. 2002-39061 .
- a vacuum pump having the features defined in the preamble of claim is e.g. know from document JP 63-085292 A .
- vacuum apparatus for use in manufacturing semiconductor devices
- These vacuum pumps often have mutually different structures as described above, but are all driven by electric motors. Accordingly, in the vacuum apparatus of this type where the number of vacuum pumps used is large, the power consumption increases. Since the power consumption of the vacuum apparatus resultantly affects the manufacturing cost of the semiconductor device, it is desired to reduce the power consumption.
- the low vacuum pump (back pump) at the last stage among the multistage vacuum pumps is required to have a large capacity, the power consumption thereof is also large. Therefore, it is effective to suppress the power consumption of the back pump for a reduction in power consumption of the whole vacuum apparatus and thus a reduction in manufacturing cost of the semiconductor device, which is thus desirable.
- auxiliary pump is an ejector pump additionally attached to the discharge port of the vaccum pump .
- the vacuum pump wherein the ejector pump portion is incorporated in the vacuum pump.
- the vacuum pump wherein the vacuum pump is a dry pump, a screw pump or a Roots pump.
- the vacuum apparatus or the vacuum pump of this invention it is possible to suppress the power consumption of the vacuum pump as compared with conventional and, as a result, to reduce the manufacturing cost of a semiconductor device.
- a vacuum apparatus according to each embodiment of this invention is systemically the same as the vacuum apparatus shown in Fig. 1 . Therefore, explanation about the same structure as that in Fig. 1 is omitted.
- This invention particularly has a feature in the back pumps 4b, 5b, and 6b serving as the last-stage (third) vacuum pumps in Fig. 1 .
- the back pumps 4b, 5b, and 6b are each provided with an ejector pump that can mainly assist a pressure reducing operation by the back pump or suppress back diffusion from a discharge port, as will be described in detail later.
- screw pumps A are used as the back pumps 4b, 5b, and 6b in Fig. 1 , respectively.
- a male rotor 25 and a female rotor 26 of the screw pump A are received in a main casing 42 and rotatably supported by bearings 35 and 36 attached to an end plate 43 sealing the main casing 42 on its one end side and bearings 37 and 38 attached to an auxiliary casing 46, respectively.
- Timing gears 31 and 32 accommodated in the auxiliary casing 46 are mounted on rotation shafts 27 and 28 of the male and female rotors 25 and 26, respectively, and a gap between the male rotor 25 and the female rotor 26 is adjusted so that both rotors do not contact each other. Further, a motor M is attached to the rotation shaft of the male rotor 25 through a coupling or timing gear. It is configured that the rotation of the motor M is transmitted to the male rotor 25 and rotates the female rotor 26 through the timing gears 31 and 32.
- An auxiliary casing 55 provided with an inlet port 56 is attached to the main casing 42 on its one end side. Further, the end plate 43 of the main casing 42 is formed with a discharge port 57 for discharging a gas compressed by the male rotor 25 and the female rotor 26.
- a cooling jacket 33 is formed on the outside of the main casing 42.
- a coolant such as water is caused to flow in the cooling jacket 33 to thereby cool the main casing 42, the compressed gas, and so on.
- an ejector pump 60 connected to the discharge port 57 of each screw pump A so as to suppress back diffusion through the discharge port 57 from the exterior at the atmospheric pressure.
- the ejector pump 60 is additionally attached to the discharge port 57 of the screw pump A as a component different from the screw pump A.
- the ejector pump 60 comprises an inlet port 62, a gas inlet 63, a diffuser 64, and a discharge port 65.
- an inert gas is constantly introduced from the gas inlet 63 toward the diffuser 61 of each ejector pump 60 under a pressure of 0.1MPa to 0.5MPa regardless of whether or not the gas is introduced into the reaction chambers 10, 11, and 12 ( Fig. 1 ).
- the pressure near the inlet port 62 and the discharge port 57 of the screw pump A becomes several 1000Pa to several 10000Pa. Since the ejector pump principle about generation of following flow, generation of shock wave in the diffuser, and so on is known, explanation thereof is omitted here.
- the back diffusion heading toward the inlet port 56 of the screw pump A from the exterior at the atmospheric pressure through the discharge port 65 and the inlet port 62 of the ejector pump 60 and the discharge port 57 of the screw pump A is extremely reduced.
- the high vacuum pumps 1, 2, and 3, the booster pumps 4a, 5a, and 6a, and the back pumps 4b, 5b, and 6b, particularly the back pumps 4b, 5b, and 6b efficiently operate so that the power consumption thereof can be largely reduced.
- the back pressure (atmospheric pressure) at the discharge port 65 can be reduced to about 300 torr at the inlet port 62.
- Fig. 5 shows the result of examining the relationship between the pressure at the inlet port 56 of the screw pump A and the power consumption of the screw pump A when the screw pumps A were applied as the back pumps 4b, 5b, and 6b in the vacuum apparatus shown in Fig. 1 .
- pumps each having the same structure as the screw pump A except having no ejector pump were applied as the back pumps 4b, 5b, and 6b in the vacuum apparatus of Fig. 1 as a comparative example and the same measurement was carried out.
- the power consumption is low overall regardless of the value of the inlet pressure as compared with the screw pump having no ejector pump.
- the power consumption of the screw pump A having the ejector pump 60 is reduced by approximately 50% as compared with that of the screw pump having no ejector pump.
- screw pumps B are used as the back pumps 4b, 5b, and 6b in Fig. 1 , respectively.
- a male rotor 25 and a female rotor 26 are received in a main casing 42 and rotatably supported by bearings 35 and 36 attached to an end plate 43 sealing the main casing 42 on its one end side and bearings 37 and 38 attached to an auxiliary casing 46, respectively.
- Timing gears 31 and 32 accommodated in the auxiliary casing 46 are mounted on rotation shafts 27 and 28 of the male and female rotors 25 and 26, respectively, and a gap between the male rotor 25 and the female rotor 26 is adjusted so that both rotors do not contact each other. Further, a motor M is attached to the rotation shaft of the male rotor 25 through a coupling or timing gear. It is configured that the rotation of the motor M is transmitted to the male rotor 25 and rotates the female rotor 26 through the timing gears 31 and 32.
- An auxiliary casing 55 provided with an inlet port 56 is attached to the main casing 42 on its one end side. Further, the end plate 43 of the main casing 42 is formed with a discharge port 57 for discharging a gas compressed by the male rotor 25 and the female rotor 26.
- a cooling jacket 33 is formed on the outside of the main casing 42.
- a coolant such as water is caused to flow in the cooling jacket 33 to thereby cool the main casing 42, the compressed gas, and so on.
- each screw pump B is incorporated with an ejector pump portion 60 connected to the discharge port 57 so as to suppress back diffusion through the discharge port 57 from the exterior at the atmospheric pressure. That is, the ejector pump portion 60 is incorporated at the discharge port 57 portion in the end plate 43 of the screw pump B as a component integral with the screw pump B.
- the ejector pump portion 60 comprises an inlet port 62, a gas inlet 63, a diffuser 64, and a discharge port 65.
- an inert gas is constantly introduced from the gas inlet 63 toward the diffuser 61 of each ejector pump portion 60 under a pressure of 0.1MPa to 0.5MPa regardless of whether or not the gas is introduced into the reaction chambers 10, 11, and 12 ( Fig. 1 ).
- the pressure near the inlet port 62 and the discharge port 57 of the screw pump B becomes several 1000Pa to several 10000Pa.
- the back diffusion heading toward the inlet port 56 of the screw pump B from the exterior at the atmospheric pressure through the discharge port 65 and the inlet port 62 of the ejector pump portion 60 and the discharge port 57 of the screw pump B is extremely reduced. Because of the suppression of the back diffusion, the high vacuum pumps 1, 2, and 3, the booster pumps 4a, 5a, and 6a, and the back pumps 4b, 5b, and 6b, particularly the back pumps 4b, 5b, and 6b, efficiently operate so that the power consumption thereof can be largely reduced.
- the power consumption is low overall regardless of the value of the inlet pressure as compared with the screw pump having no ejector pump.
- the power consumption of the screw pump B having the ejector pump portion 60 is reduced by approximately 50% as compared with that of the screw pump having no ejector pump.
- the screw pump according to this embodiment is incorporated with the ejector pump portion, it is compact as compared with the screw pump externally mounted with the ejector pump like in the embodiment 1. Accordingly, when applied to a vacuum apparatus having a plurality of back pumps, it is possible to reduce the occupying space of the whole vacuum apparatus.
- the screw pump is cited as the example of the back pump.
- the vacuum pump according to this invention that is attached with or incorporated with the ejector pump may be a Roots pump or the like.
- the vacuum pump according to this invention is not limited to the back pump in the multistage structure but can be used as a vacuum pump in a single-stage structure as long as the back pressure thereof is within a pressure area over which the effect of the ejector pump appears. Moreover, the use thereof is not limited to the vacuum apparatus for manufacturing semiconductor devices.
- a vacuum pump according to this invention is not limited to a back pump in a multistage structure but can be used as a vacuum pump in a single-stage structure as long as the back pressure thereof is within a pressure area over which the effect of an ejector pump appears. Further, a use thereof is not limited to a vacuum apparatus for manufacturing semiconductor devices.
Description
- Relating to a vacuum apparatus and, in particular, relating to a vacuum apparatus for use in the semiconductor manufacturing field and so on and a vacuum pump for use in such a vacuum apparatus.
- Vacuum apparatuses have been used in the semiconductor manufacturing field and many other industrial fields. The vacuum apparatuses each generally comprise a vacuum chamber and a vacuum pump for keeping the inside of the vacuum chamber in a vacuum or pressure-reduced state.
- The vacuum apparatus is disposed in a clean room and is configured to perform predetermined processing while introducing and exhausting a predetermined process gas into and from the vacuum chamber.
- Referring to
Fig. 1 , description will be given of one example of a conventional vacuum apparatus employed in a semiconductor manufacturing system. - This vacuum apparatus comprises a plurality of reaction chambers (vacuum chambers) 10, 11, and 12,
high vacuum pumps reaction chambers booster pumps back pumps - Further,
valves high vacuum pumps booster pumps - There are further provided
load lock chambers reaction chambers transfer chamber 15 provided therein with a robot (transfer apparatus) that transfers the processing objects, brought into theload lock chamber 13, into thereaction chambers reaction chambers load lock chamber 14. - A
booster pump 8a and aback pump 8b are connected to theload lock chamber 13, abooster pump 7a and aback pump 7b are connected to theload lock chamber 14, and abooster pump 9a and aback pump 9b are connected to thetransfer chamber 15, thereby being capable of bringing those chambers into pressure-reduced or vacuum states, respectively. - Further, although not illustrated, the
reaction chambers - In the figure, symbols A1 denote pipes between the
high vacuum pumps booster pumps reaction chambers high vacuum pumps - In the state where this vacuum apparatus is on standby, the
transfer chamber 15 and thereaction chambers - Then, a cassette with a plurality of processing objects such as wafers placed therein is brought into the
load lock chamber 13 from the atmosphere outside the apparatus and theload lock chamber 13 is exhausted. - Subsequently, a gate valve (not illustrated) between the
load lock chamber 13 and thetransfer chamber 15 is opened and the processing object transfer robot uses its transfer arm to pick up one of the processing objects from the cassette and transfer it into thetransfer chamber 15. - Thereafter, a gate valve (not illustrated) between the
reaction chamber 10 and thetransfer chamber 15 is opened and the processing object is placed on a stage in thereaction chamber 10 by the use of the transfer arm. - Then, after the predetermined processing such as film formation, the processed object is transferred into the
other reaction chamber load lock chamber 14 by the use of the transfer arm. - Then, after the processing, the processed object is finally transferred to the exterior from the
load lock chamber 14. - In the conventional vacuum apparatuses including the system shown in
Fig. 1 , use is generally made, as the high vacuum pump, of a high vacuum pump that operates in the molecular area of ultimate vacuum (10-7 torr or less). Specifically, a turbomolecular pump or a thread groove pump is generally used as the high vacuum pump. - The turbomolecular pump and the thread groove pump each generally have a low allowable back pressure of 1 torr or less (specifically 0.5 torr or less and more specifically about 0.4 torr) while the pumping speed is high even with a small size. Therefore, there is/are provided, at the subsequent stage of the high vacuum pump, an intermediate/low vacuum pump or intermediate/low vacuum pumps in one or two stages which each operate at a relatively low back pressure while the ultimate vacuum is relatively low.
- For example, in the case where vacuum pumps are provided in two stages at the subsequent stage of the high vacuum pump, a booster pump or the like is provided subsequent to the high vacuum pump as an intermediate vacuum pump and, further, a Roots pump or the like is provided subsequent to the booster pump as a low vacuum pump that operates at a relatively low back pressure while the ultimate vacuum is low.
- A vacuum apparatus of this type having a plurality of stages of vacuum pumps for use in the semiconductor device manufacturing field is disclosed, for example, in Japanese Unexamined Patent Application Publication (JP-A) No.
2002-39061 - This object is solved by a vacuum pump having the technical features defined in
patent claim 1. - A vacuum pump having the features defined in the preamble of claim is e.g. know from document
JP 63-085292 A - As described above, in a vacuum apparatus for use in manufacturing semiconductor devices, use is generally made of two or three vacuum pumps, arranged in multistages in series with respect to one reaction chamber (vacuum chamber). These vacuum pumps often have mutually different structures as described above, but are all driven by electric motors. Accordingly, in the vacuum apparatus of this type where the number of vacuum pumps used is large, the power consumption increases. Since the power consumption of the vacuum apparatus resultantly affects the manufacturing cost of the semiconductor device, it is desired to reduce the power consumption.
- Particularly, since the low vacuum pump (back pump) at the last stage among the multistage vacuum pumps is required to have a large capacity, the power consumption thereof is also large. Therefore, it is effective to suppress the power consumption of the back pump for a reduction in power consumption of the whole vacuum apparatus and thus a reduction in manufacturing cost of the semiconductor device, which is thus desirable.
- Therefore, it is an object of this invention to provide a vacuum apparatus and a vacuum pump that can suppress the power consumption.
- Further, according to this invention, there is obtained a vacuum pump, wherein the auxiliary pump is an ejector pump additionally attached to the discharge port of the vaccum pump .
- Further, according to this invention, there is obtained the vacuum pump, wherein the ejector pump portion is incorporated in the vacuum pump.
- Further, according to this invention, there is obtained the vacuum pump, wherein the vacuum pump is a dry pump, a screw pump or a Roots pump.
- According to the vacuum apparatus or the vacuum pump of this invention, it is possible to suppress the power consumption of the vacuum pump as compared with conventional and, as a result, to reduce the manufacturing cost of a semiconductor device.
-
-
Fig. 1 is a schematic diagram showing a vacuum apparatus for semiconductor manufacturing to be applied with this invention; -
Fig. 2 , (a) and (b) are sectional views showing a screw pump as a last-stage vacuum pump in a vacuum apparatus according to anembodiment 1 of this invention; -
Fig. 3 is a sectional view showing an ejector pump in the vacuum apparatus according to theembodiment 1 of this invention; -
Fig. 4 , (a) and (b) are sectional views showing a screw pump as a last-stage vacuum pump in a vacuum apparatus according to anembodiment 2 of this invention; and -
Fig. 5 is a diagram showing the relationship between inlet pressure and power consumption of the pump along with that of a comparative example for explaining the operation and effect of this invention. - Hereinbelow, embodiments of this invention will be described with reference to the drawings.
- A vacuum apparatus according to each embodiment of this invention is systemically the same as the vacuum apparatus shown in
Fig. 1 . Therefore, explanation about the same structure as that inFig. 1 is omitted. - This invention particularly has a feature in the
back pumps Fig. 1 . Specifically, theback pumps - In the
embodiment 1 of this invention, screw pumps A are used as theback pumps Fig. 1 , respectively. - Referring to
Fig. 2 , (a) and (b), amale rotor 25 and afemale rotor 26 of the screw pump A are received in amain casing 42 and rotatably supported bybearings end plate 43 sealing themain casing 42 on its one end side andbearings auxiliary casing 46, respectively. -
Timing gears auxiliary casing 46 are mounted onrotation shafts female rotors male rotor 25 and thefemale rotor 26 is adjusted so that both rotors do not contact each other. Further, a motor M is attached to the rotation shaft of themale rotor 25 through a coupling or timing gear. It is configured that the rotation of the motor M is transmitted to themale rotor 25 and rotates thefemale rotor 26 through thetiming gears - An
auxiliary casing 55 provided with aninlet port 56 is attached to themain casing 42 on its one end side. Further, theend plate 43 of themain casing 42 is formed with adischarge port 57 for discharging a gas compressed by themale rotor 25 and thefemale rotor 26. - Since the
main casing 42, the compressed gas, and so on rise in temperature due to the compression of the gas, acooling jacket 33 is formed on the outside of themain casing 42. A coolant such as water is caused to flow in thecooling jacket 33 to thereby cool themain casing 42, the compressed gas, and so on. - In the screw pump A thus configured, when the
male rotor 25 is rotationally driven by the motor M, thefemale rotor 26 is rotationally driven through thetiming gears male rotor 25 and thefemale rotor 26, a gas from the corresponding one of the upper-stage booster pumps Fig. 1 ) is sucked through theinlet port 56 into a working chamber formed by themale rotor 25, thefemale rotor 26, and themain casing 42. The sucked gas is discharged through thedischarge port 57 while being compressed following the rotation of themale rotor 25 and thefemale rotor 26. - Herein, in this vacuum apparatus, there is provided an
ejector pump 60 connected to thedischarge port 57 of each screw pump A so as to suppress back diffusion through thedischarge port 57 from the exterior at the atmospheric pressure. Theejector pump 60 is additionally attached to thedischarge port 57 of the screw pump A as a component different from the screw pump A. - Referring also to
Fig. 3 , theejector pump 60 comprises aninlet port 62, agas inlet 63, adiffuser 64, and adischarge port 65. - During the operation of this vacuum apparatus, i.e. during the operation of the
high vacuum pumps back pumps Fig. 1 ), an inert gas is constantly introduced from thegas inlet 63 toward the diffuser 61 of eachejector pump 60 under a pressure of 0.1MPa to 0.5MPa regardless of whether or not the gas is introduced into thereaction chambers Fig. 1 ). - Consequently, according to the ejector pump principle, the pressure near the
inlet port 62 and thedischarge port 57 of the screw pump A becomes several 1000Pa to several 10000Pa. Since the ejector pump principle about generation of following flow, generation of shock wave in the diffuser, and so on is known, explanation thereof is omitted here. - As a result, the back diffusion heading toward the
inlet port 56 of the screw pump A from the exterior at the atmospheric pressure through thedischarge port 65 and theinlet port 62 of theejector pump 60 and thedischarge port 57 of the screw pump A is extremely reduced. Because of the suppression of the back diffusion, thehigh vacuum pumps back pumps back pumps ejector pump 60, the back pressure (atmospheric pressure) at thedischarge port 65 can be reduced to about 300 torr at theinlet port 62. -
Fig. 5 shows the result of examining the relationship between the pressure at theinlet port 56 of the screw pump A and the power consumption of the screw pump A when the screw pumps A were applied as theback pumps Fig. 1 . In this examination, pumps each having the same structure as the screw pump A except having no ejector pump were applied as theback pumps Fig. 1 as a comparative example and the same measurement was carried out. - As clear from
Fig. 5 , with respect to the screw pump A having theejector pump 60, the power consumption is low overall regardless of the value of the inlet pressure as compared with the screw pump having no ejector pump. Particularly, when the inlet pressure is less than 10 torr, the power consumption of the screw pump A having theejector pump 60 is reduced by approximately 50% as compared with that of the screw pump having no ejector pump. - In other words, in the case where the screw pumps A are applied as the
back pumps Fig. 1 , it can be said that a higher effect is achieved when no gas is introduced into thereaction chambers Fig. 1 ). - In the
embodiment 2 of this invention, screw pumps B are used as theback pumps Fig. 1 , respectively. - Referring to
Fig. 4 , (a) and (b), in the screw pump B, like in the screw pump A shown inFig. 2 , (a) and (b), amale rotor 25 and afemale rotor 26 are received in amain casing 42 and rotatably supported bybearings end plate 43 sealing themain casing 42 on its one end side andbearings auxiliary casing 46, respectively. - Timing gears 31 and 32 accommodated in the
auxiliary casing 46 are mounted onrotation shafts female rotors male rotor 25 and thefemale rotor 26 is adjusted so that both rotors do not contact each other. Further, a motor M is attached to the rotation shaft of themale rotor 25 through a coupling or timing gear. It is configured that the rotation of the motor M is transmitted to themale rotor 25 and rotates thefemale rotor 26 through the timing gears 31 and 32. - An
auxiliary casing 55 provided with aninlet port 56 is attached to themain casing 42 on its one end side. Further, theend plate 43 of themain casing 42 is formed with adischarge port 57 for discharging a gas compressed by themale rotor 25 and thefemale rotor 26. - Since the
main casing 42, the compressed gas, and so on rise in temperature due to the compression of the gas, a coolingjacket 33 is formed on the outside of themain casing 42. A coolant such as water is caused to flow in the coolingjacket 33 to thereby cool themain casing 42, the compressed gas, and so on. - In the screw pump B thus configured, when the
male rotor 25 is rotationally driven by the motor M, thefemale rotor 26 is rotationally driven through the timing gears 31 and 32. Then, following the rotation of themale rotor 25 and thefemale rotor 26, a gas from the corresponding one of the upper-stage booster pumps Fig. 1 ) is sucked through theinlet port 56 into a working chamber formed by themale rotor 25, thefemale rotor 26, and themain casing 42. The sucked gas is discharged through thedischarge port 57 while being compressed following the rotation of themale rotor 25 and thefemale rotor 26. - In this embodiment, each screw pump B is incorporated with an
ejector pump portion 60 connected to thedischarge port 57 so as to suppress back diffusion through thedischarge port 57 from the exterior at the atmospheric pressure. That is, theejector pump portion 60 is incorporated at thedischarge port 57 portion in theend plate 43 of the screw pump B as a component integral with the screw pump B. - The
ejector pump portion 60 comprises aninlet port 62, agas inlet 63, adiffuser 64, and adischarge port 65. - During the operation of this vacuum apparatus, i.e. during the operation of the
high vacuum pumps back pumps Fig. 1 ), an inert gas is constantly introduced from thegas inlet 63 toward the diffuser 61 of eachejector pump portion 60 under a pressure of 0.1MPa to 0.5MPa regardless of whether or not the gas is introduced into thereaction chambers Fig. 1 ). - Consequently, according to the ejector pump principle, the pressure near the
inlet port 62 and thedischarge port 57 of the screw pump B becomes several 1000Pa to several 10000Pa. - As a result, the back diffusion heading toward the
inlet port 56 of the screw pump B from the exterior at the atmospheric pressure through thedischarge port 65 and theinlet port 62 of theejector pump portion 60 and thedischarge port 57 of the screw pump B is extremely reduced. Because of the suppression of the back diffusion, thehigh vacuum pumps back pumps back pumps - Even when the screw pumps B according to this embodiment were applied as the
back pumps Fig. 1 , the result shown inFig. 5 was obtained like in theembodiment 1. - As clear from
Fig. 5 , with respect to the screw pump B having theejector pump portion 60, the power consumption is low overall regardless of the value of the inlet pressure as compared with the screw pump having no ejector pump. Particularly, when the inlet pressure is less than 10 torr, the power consumption of the screw pump B having theejector pump portion 60 is reduced by approximately 50% as compared with that of the screw pump having no ejector pump. - In other words, in the case where the screw pumps B are applied as the
back pumps Fig. 1 , it can be said that a higher effect is achieved when no gas is introduced into thereaction chambers Fig. 1 ). - Since the screw pump according to this embodiment is incorporated with the ejector pump portion, it is compact as compared with the screw pump externally mounted with the ejector pump like in the
embodiment 1. Accordingly, when applied to a vacuum apparatus having a plurality of back pumps, it is possible to reduce the occupying space of the whole vacuum apparatus. - In the foregoing embodiments, the screw pump is cited as the example of the back pump. However, the vacuum pump according to this invention that is attached with or incorporated with the ejector pump may be a Roots pump or the like.
- Further, the vacuum pump according to this invention is not limited to the back pump in the multistage structure but can be used as a vacuum pump in a single-stage structure as long as the back pressure thereof is within a pressure area over which the effect of the ejector pump appears. Moreover, the use thereof is not limited to the vacuum apparatus for manufacturing semiconductor devices.
- A vacuum pump according to this invention is not limited to a back pump in a multistage structure but can be used as a vacuum pump in a single-stage structure as long as the back pressure thereof is within a pressure area over which the effect of an ejector pump appears. Further, a use thereof is not limited to a vacuum apparatus for manufacturing semiconductor devices.
Claims (7)
- A vacuum pump (A, B) used in vacuum apparatus, wherein the vacuum apparatus comprises a vacuum chamber (10) having a gas inlet and a gas outlet and mechanical vacuum pumps in a plurality of stages (1, 4a, 4b) connected to said vacuum chamber (10), said mechanical vacuum pumps (1, 4a, 4b) reduce a pressure inside said vacuum chamber and maintain a pressure-reduced state;
wherein said vacuum pump (A, B) serves as the vacuum pump at the last stage (4b) of said mechanical vacuum pumps (1, 4a, 4b) and comprises a discharge port (57) and a non-mechanical auxiliary pump (60) connected to said discharge port (57);
wherein said auxiliary pump (60) assists a pressure reducing operation of said vacuum pump (A, B) and suppresses back diffusion from said discharge port (57) ;
wherein said auxiliary pump (60) is directly connected to said discharge port (57) and is integrated with said vacuum pump (A, B);
wherein said auxiliary pump (60) comprises an auxiliary gas inlet (63) formed one end of said auxiliary pump (60), an auxiliary discharge port (65) formed the other end of said auxiliary pump (60), a diffuser (64) formed between said auxiliary gas inlet (63) and said auxiliary discharge port (65), and an auxiliary inlet port (62) formed between said auxiliary gas inlet (63) and said diffuser (64) and directly connected to said discharge port (57) of said vacuum pump at the last stage (A, B);
characterized in that an inert gas is constantly introduced from said auxiliary gas inlet (63) toward said diffuser (64) of said auxiliary pump (60) under a pressure of 0.1MPa to 0.5MPa. - A vacuum pump (A) according to claim 1, wherein said auxiliary pump (60) is an ejector pump additionally attached to said discharge port (57) of said vacuum pump (A).
- A vacuum pump (B) according to claim 1, wherein said auxiliary pump (60) is an ejector pump incorporated in said vacuum pump (B).
- A vacuum pump (A, B) according to any one of claims 1 to 3, wherein said vacuum pump (A, B) is a dry pump.
- A vacuum pump (A, B) according to claim 4, wherein said vacuum pump (A, B) is a screw pump or a Roots pump.
- A vacuum apparatus comprising said vacuum pump (A, B) according to any one of claims 1 to 5, said vacuum chamber (10), and said vacuum pumps (1, 4a, 4b).
- A vacuum apparatus according to claim 6, wherein said vacuum pumps are structured by a first vacuum pump (1) for maintaining the inside of said vacuum chamber (10) to be reduced in pressure, a second vacuum pump (4a) connected at a subsequent stage of said first vacuum pump (1), and a third vacuum pump connected at a subsequent stage of said second vacuum pump (4a), said third vacuum pump serving as said pump at the last stage (4b);
wherein said first vacuum pump (1) is a turbomolecular pump or a thread groove pump; and
wherein said second vacuum pump (4a) is a booster pump.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003055749 | 2003-03-03 | ||
JP2003055749A JP2004263635A (en) | 2003-03-03 | 2003-03-03 | Vacuum device and vacuum pump |
PCT/JP2004/002484 WO2004079192A1 (en) | 2003-03-03 | 2004-03-01 | Vacuum device and vacuum pump |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1609990A1 EP1609990A1 (en) | 2005-12-28 |
EP1609990A4 EP1609990A4 (en) | 2007-07-18 |
EP1609990B1 true EP1609990B1 (en) | 2009-08-12 |
Family
ID=32958669
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04716009A Expired - Fee Related EP1609990B1 (en) | 2003-03-03 | 2004-03-01 | Vacuum device and vacuum pump |
Country Status (6)
Country | Link |
---|---|
US (1) | US20060182638A1 (en) |
EP (1) | EP1609990B1 (en) |
JP (1) | JP2004263635A (en) |
DE (1) | DE602004022519D1 (en) |
TW (1) | TW200506205A (en) |
WO (1) | WO2004079192A1 (en) |
Cited By (1)
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CN103900376A (en) * | 2014-04-15 | 2014-07-02 | 吴江市赛纳电子科技有限公司 | Manual vacuum furnace |
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GB0418771D0 (en) * | 2004-08-20 | 2004-09-22 | Boc Group Plc | Evacuation of a load lock enclosure |
JP4745779B2 (en) * | 2005-10-03 | 2011-08-10 | 神港精機株式会社 | Vacuum equipment |
FR2952683B1 (en) * | 2009-11-18 | 2011-11-04 | Alcatel Lucent | METHOD AND APPARATUS FOR PUMPING WITH REDUCED ENERGY CONSUMPTION |
TW201118259A (en) * | 2009-11-19 | 2011-06-01 | Ji Ee Industry Co Ltd | Water pump |
CN102062088B (en) * | 2011-01-19 | 2012-11-28 | 西安交通大学 | Two-screw multiphase pump device suitable for working condition with high air void |
US20120261011A1 (en) * | 2011-04-14 | 2012-10-18 | Young Man Cho | Energy reduction module using a depressurizing vacuum apparatus for vacuum pump |
EP2644264A1 (en) * | 2012-03-28 | 2013-10-02 | Aurotec GmbH | Pressure-controlled multi-reactor system |
DE102012220442A1 (en) * | 2012-11-09 | 2014-05-15 | Oerlikon Leybold Vacuum Gmbh | Vacuum pump system for evacuating a chamber and method for controlling a vacuum pump system |
FR3008145B1 (en) * | 2013-07-04 | 2015-08-07 | Pfeiffer Vacuum Sas | DRY PRIMARY VACUUM PUMP |
KR102223057B1 (en) | 2014-06-27 | 2021-03-05 | 아뜰리에 부쉬 에스.아. | Method of Pumping in A System of Vacuum Pumps And System of Vacuum Pumps |
PT3201469T (en) * | 2014-10-02 | 2020-04-23 | Ateliers Busch S A | Pumping system for generating a vacuum and method for pumping by means of this pumping system |
US11209024B2 (en) | 2015-06-24 | 2021-12-28 | Itt Manufacturing Enterprises Llc | Discharge casing insert for pump performance characteristics control |
US10155600B2 (en) * | 2015-12-28 | 2018-12-18 | Starvac Systems Pty Ltd | Apparatus for vacuum sealing products |
FR3077343B1 (en) * | 2018-01-29 | 2020-02-14 | Norauto France | SUCTION PLANT FOR THE COLLECTION OF WASTE FLUIDS FROM A MOTOR VEHICLE, DEVICE COMPRISING THE PLANT AND COLLECTION METHOD |
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- 2003-03-03 JP JP2003055749A patent/JP2004263635A/en active Pending
-
2004
- 2004-03-01 US US10/548,225 patent/US20060182638A1/en not_active Abandoned
- 2004-03-01 DE DE602004022519T patent/DE602004022519D1/en not_active Expired - Fee Related
- 2004-03-01 EP EP04716009A patent/EP1609990B1/en not_active Expired - Fee Related
- 2004-03-01 WO PCT/JP2004/002484 patent/WO2004079192A1/en active Application Filing
- 2004-03-03 TW TW093105511A patent/TW200506205A/en unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN103900376A (en) * | 2014-04-15 | 2014-07-02 | 吴江市赛纳电子科技有限公司 | Manual vacuum furnace |
CN103900376B (en) * | 2014-04-15 | 2015-11-18 | 吴江市赛纳电子科技有限公司 | A kind of manual vacuum stove |
Also Published As
Publication number | Publication date |
---|---|
EP1609990A4 (en) | 2007-07-18 |
US20060182638A1 (en) | 2006-08-17 |
JP2004263635A (en) | 2004-09-24 |
DE602004022519D1 (en) | 2009-09-24 |
TW200506205A (en) | 2005-02-16 |
EP1609990A1 (en) | 2005-12-28 |
WO2004079192A1 (en) | 2004-09-16 |
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