WO2022131035A1 - 真空ポンプ - Google Patents
真空ポンプ Download PDFInfo
- Publication number
- WO2022131035A1 WO2022131035A1 PCT/JP2021/044570 JP2021044570W WO2022131035A1 WO 2022131035 A1 WO2022131035 A1 WO 2022131035A1 JP 2021044570 W JP2021044570 W JP 2021044570W WO 2022131035 A1 WO2022131035 A1 WO 2022131035A1
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- WO
- WIPO (PCT)
- Prior art keywords
- rotation
- vacuum pump
- rotor
- annular member
- casing
- Prior art date
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- 230000000630 rising effect Effects 0.000 claims description 37
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 230000007547 defect Effects 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 230000001629 suppression Effects 0.000 abstract 1
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- 125000006850 spacer group Chemical group 0.000 description 20
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- 239000002184 metal Substances 0.000 description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 230000002093 peripheral effect Effects 0.000 description 12
- 238000001514 detection method Methods 0.000 description 9
- 238000004804 winding Methods 0.000 description 9
- 229910052742 iron Inorganic materials 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 230000005284 excitation Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
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- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 238000010926 purge Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
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- 239000007787 solid Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910003902 SiCl 4 Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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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
- 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
- F04D19/044—Holweck-type 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
- 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
- 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
- F04D19/042—Turbomolecular vacuum 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
- 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
- F04D19/048—Multi-stage pumps specially adapted to the production of a high vacuum, e.g. molecular pumps comprising magnetic bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid 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
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
- F04D29/5853—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps heat insulation or conduction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/30—Retaining components in desired mutual position
- F05D2260/31—Retaining bolts or nuts
Definitions
- the present invention relates to a vacuum pump.
- a vacuum pump such as a turbo molecular pump includes a rotor rotated by a motor and a stator arranged around the rotor to form a flow path together with the rotor, and gas molecules entering from an intake port are referred to as rotor blades of the rotor. It collides with the stator blades of the stator and is transferred toward the exhaust port.
- a vacuum pump is further provided with an annular member that raises the temperature of the stator side in order to prevent gaseous reaction raw materials, reaction products, etc. from adhering to or depositing on the wall surface in the flow path and accumulating.
- An exhaust port is connected to the member (see, for example, Patent Document 1).
- the present invention has been made in view of the above problems, and an object of the present invention is to obtain a vacuum pump that suppresses an influence on external piping due to a contact failure of the rotor during rotation of the rotor.
- the vacuum pump according to the present invention includes a rotor, a stator, a casing accommodating the rotor and the stator, and an annular member to which a rotational force is directly or indirectly applied due to a contact failure of the rotor during rotation of the rotor.
- a pipe connecting portion connected to the annular member and connected to an external pipe, and a rotation suppressing means for suppressing rotation of the annular member due to the above-mentioned rotational force are provided separately from the connecting portion between the annular member and the casing.
- FIG. 1 is a vertical sectional view showing a turbo molecular pump as a vacuum pump according to the first embodiment of the present invention.
- FIG. 2 is a circuit diagram showing an amplifier circuit that controls the excitation of the electromagnet of the turbo molecular pump shown in FIG. 1.
- FIG. 3 is a time chart showing control when the current command value is larger than the detected value.
- FIG. 4 is a time chart showing control when the current command value is smaller than the detected value.
- FIG. 5 is a side view showing a turbo molecular pump as a vacuum pump according to the first embodiment of the present invention.
- FIG. 6 is a cross-sectional view of the turbo molecular pump shown in FIG. FIG.
- FIG. 7 is a vertical sectional view showing a turbo molecular pump 100 as a vacuum pump according to the second embodiment of the present invention.
- FIG. 8 is a cross-sectional view of the turbo molecular pump shown in FIG. 7.
- FIG. 9 is a perspective view showing an example of the rotation suppressing means according to the second embodiment.
- Embodiment 1 A vertical sectional view of the turbo molecular pump 100 is shown in FIG.
- an intake port 101 is formed at the upper end of a cylindrical outer cylinder 127.
- a rotating body 103 in which a plurality of rotary blades 102 (102a, 102b, 102c ...), Which are turbine blades for sucking and exhausting gas, are radially and multistagely formed on the peripheral portion inside the outer cylinder 127. Is provided.
- a rotor shaft 113 is attached to the center of the rotating body 103, and the rotor shaft 113 is floated and supported in the air and position-controlled by, for example, a 5-axis controlled magnetic bearing.
- the rotating body 103 is generally made of a metal such as aluminum or an aluminum alloy.
- the upper radial electromagnet 104 In the upper radial electromagnet 104, four electromagnets are arranged in pairs on the X-axis and the Y-axis.
- Four upper radial sensors 107 are provided in close proximity to the upper radial electromagnet 104 and corresponding to each of the upper radial electromagnets 104.
- the upper radial sensor 107 for example, an inductance sensor having a conduction winding, an eddy current sensor, or the like is used, and the position of the rotor shaft 113 is based on the change in the inductance of the conduction winding that changes according to the position of the rotor shaft 113. Is detected.
- the upper radial sensor 107 is configured to detect the radial displacement of the rotor shaft 113, that is, the rotating body 103 fixed to the rotor shaft 113, and send it to the control device 200.
- a compensation circuit having a PID adjustment function generates an excitation control command signal of the upper radial electromagnet 104 based on the position signal detected by the upper radial sensor 107, and is shown in FIG.
- the amplifier circuit 150 (described later) excites and controls the upper radial electromagnet 104 based on this excitation control command signal, so that the upper radial position of the rotor shaft 113 is adjusted.
- the rotor shaft 113 is made of a high magnetic permeability material (iron, stainless steel, etc.) and is attracted by the magnetic force of the upper radial electromagnet 104. Such adjustment is performed independently in the X-axis direction and the Y-axis direction, respectively. Further, the lower radial electric magnet 105 and the lower radial sensor 108 are arranged in the same manner as the upper radial electric magnet 104 and the upper radial sensor 107, and the lower radial position of the rotor shaft 113 is set to the upper radial position. It is adjusted in the same way as.
- the axial electromagnets 106A and 106B are arranged so as to vertically sandwich the disc-shaped metal disk 111 provided in the lower part of the rotor shaft 113.
- the metal disk 111 is made of a high magnetic permeability material such as iron.
- An axial sensor 109 is provided to detect the axial displacement of the rotor shaft 113, and the axial position signal thereof is configured to be sent to the control device 200.
- a compensation circuit having a PID adjustment function sends an excitation control command signal for each of the axial electromagnet 106A and the axial electromagnet 106B based on the axial position signal detected by the axial sensor 109.
- the generated amplifier circuit 150 excites and controls the axial electromagnet 106A and the axial electromagnet 106B based on these excitation control command signals, so that the axial electromagnet 106A attracts the metal disk 111 upward by magnetic force.
- the axial electromagnet 106B attracts the metal disk 111 downward, and the axial position of the rotor shaft 113 is adjusted.
- control device 200 appropriately adjusts the magnetic force exerted by the axial electromagnets 106A and 106B on the metal disk 111, magnetically levitates the rotor shaft 113 in the axial direction, and holds the rotor shaft 113 in the space in a non-contact manner.
- the amplifier circuit 150 that excites and controls the upper radial electromagnet 104, the lower radial electromagnet 105, and the axial electromagnets 106A and 106B will be described later.
- the motor 121 includes a plurality of magnetic poles arranged in a circumferential shape so as to surround the rotor shaft 113. Each magnetic pole is controlled by the control device 200 so as to rotationally drive the rotor shaft 113 via an electromagnetic force acting on the rotor shaft 113. Further, the motor 121 incorporates a rotation speed sensor such as a Hall element, a resolver, an encoder, etc. (not shown), and the rotation speed of the rotor shaft 113 is detected by the detection signal of the rotation speed sensor.
- a rotation speed sensor such as a Hall element, a resolver, an encoder, etc.
- a phase sensor (not shown) is attached near the lower radial sensor 108 to detect the phase of rotation of the rotor shaft 113.
- the position of the magnetic pole is detected by using both the detection signals of the phase sensor and the rotation speed sensor.
- a plurality of fixed wings 123 (123a, 123b, 123c %) are arranged with a slight gap between the rotary wings 102 (102a, 102b, 102c ).
- the rotary blades 102 (102a, 102b, 102c %) are formed so as to be inclined by a predetermined angle from a plane perpendicular to the axis of the rotor shaft 113 in order to transfer exhaust gas molecules downward by collision.
- the fixed wing 123 (123a, 123b, 123c %) Is composed of a metal such as aluminum, iron, stainless steel, copper, or a metal such as an alloy containing these metals as a component.
- the fixed wing 123 is also formed so as to be inclined by a predetermined angle from a plane perpendicular to the axis of the rotor shaft 113, and is arranged alternately with the steps of the rotary wing 102 toward the inside of the outer cylinder 127. ing.
- the outer peripheral end of the fixed wing 123 is supported in a state of being fitted between a plurality of stacked fixed wing spacers 125 (125a, 125b, 125c ).
- the fixed wing spacer 125 is a ring-shaped member, and is composed of, for example, a metal such as aluminum, iron, stainless steel, or copper, or a metal such as an alloy containing these metals as a component.
- the outer cylinders 127 and 127a are fixed to the outer periphery of the fixed wing spacer 125 with a slight gap.
- a base portion 129 is arranged at the bottom of the outer cylinder 127a.
- an exhaust port 133 is arranged above the base portion 129 and communicates with the outside. The exhaust gas transferred from the chamber (vacuum chamber) side into the intake port 101 is sent to the exhaust port 133.
- a threaded spacer 131 is arranged between the lower portion of the fixed wing spacer 125 and the base portion 129.
- the threaded spacer 131 is a cylindrical member made of a metal such as aluminum, copper, stainless steel, iron, or an alloy containing these metals as a component, and has a plurality of spiral thread grooves 131a on the inner peripheral surface thereof. It is engraved.
- the direction of the spiral of the thread groove 131a is the direction in which when the exhaust gas molecule moves in the rotation direction of the rotating body 103, the molecule is transferred toward the exhaust port 133.
- a cylindrical portion 102d is hung at the lowermost portion of the rotating body 103 following the rotary blades 102 (102a, 102b, 102c ).
- the outer peripheral surface of the cylindrical portion 102d is cylindrical and projects toward the inner peripheral surface of the threaded spacer 131, and is brought close to the inner peripheral surface of the threaded spacer 131 with a predetermined gap. There is.
- the exhaust gas transferred to the screw groove 131a by the rotary blade 102 and the fixed blade 123 is sent to the base portion 129 while being guided by the screw groove 131a.
- the base portion 129 is a disk-shaped member constituting the base portion of the turbo molecular pump 100, and is generally made of a metal such as iron, aluminum, or stainless steel. Since the base portion 129 physically holds the turbo molecular pump 100 and also has the function of a heat conduction path, a metal having rigidity such as iron, aluminum or copper and having high thermal conductivity is used. Is desirable.
- the temperature of the rotary blade 102 rises due to frictional heat generated when the exhaust gas comes into contact with the rotary blade 102, conduction of heat generated by the motor 121, etc., but this heat is radiation or gas of the exhaust gas. It is transmitted to the fixed wing 123 side by conduction by molecules or the like.
- the fixed wing spacers 125 are joined to each other at the outer peripheral portion, and transmit the heat received from the rotary wing 102 by the fixed wing 123 and the frictional heat generated when the exhaust gas comes into contact with the fixed wing 123 to the outside.
- the threaded spacer 131 is arranged on the outer periphery of the cylindrical portion 102d of the rotating body 103, and the screw groove 131a is engraved on the inner peripheral surface of the threaded spacer 131.
- a screw groove is carved on the outer peripheral surface of the cylindrical portion 102d, and a spacer having a cylindrical inner peripheral surface is arranged around the thread groove.
- the gas sucked from the intake port 101 is the upper radial electric magnet 104, the upper radial sensor 107, the motor 121, the lower radial electric magnet 105, the lower radial sensor 108, and the shaft.
- the electrical component is covered with a stator column 122 so as not to invade the electrical component composed of the directional electric magnets 106A, 106B, the axial sensor 109, etc., and the inside of the stator column 122 is kept at a predetermined pressure by a purge gas. It may hang down.
- a pipe (not shown) is arranged in the base portion 129, and purge gas is introduced through this pipe.
- the introduced purge gas is sent to the exhaust port 133 through the gaps between the protective bearing 120 and the rotor shaft 113, between the rotor and the stator of the motor 121, and between the stator column 122 and the inner peripheral side cylindrical portion of the rotary blade 102.
- the turbo molecular pump 100 requires identification of a model and control based on individually adjusted unique parameters (for example, various characteristics corresponding to the model).
- the turbo molecular pump 100 includes an electronic circuit unit 141 in its main body.
- the electronic circuit unit 141 is composed of a semiconductor memory such as EEP-ROM, electronic components such as semiconductor elements for accessing the semiconductor memory, and a substrate 143 for mounting them.
- the electronic circuit portion 141 is housed in a lower portion of a rotational speed sensor (not shown) near the center of a base portion 129 constituting the lower portion of the turbo molecular pump 100, and is closed by an airtight bottom lid 145.
- some of the process gases introduced into the chamber have the property of becoming solid when the pressure becomes higher than the predetermined value or the temperature becomes lower than the predetermined value.
- the pressure of the exhaust gas is the lowest at the intake port 101 and the highest at the exhaust port 133. If the pressure rises above a predetermined value or the temperature drops below a predetermined value while the process gas is being transferred from the intake port 101 to the exhaust port 133, the process gas becomes a solid state and becomes a turbo molecule. It adheres to the inside of the pump 100 and accumulates.
- SiCl 4 when used as a process gas in an Al etching apparatus, it is a solid product (for example, at a low vacuum (760 [torr] to 10-2 [torr]) and at a low temperature (about 20 [° C.]). It can be seen from the vapor pressure curve that AlCl 3 ) is deposited and adheres to the inside of the turbo molecular pump 100. As a result, when a deposit of process gas is deposited inside the turbo molecular pump 100, this deposit narrows the pump flow path and causes the performance of the turbo molecular pump 100 to deteriorate.
- the above-mentioned product was in a state of being easily solidified and adhered in a high pressure portion near the exhaust port 133 and the screwed spacer 131.
- a heater or an annular water cooling tube 149 (not shown) is wound around the outer periphery of the base portion 129 or the like, and a temperature sensor (for example, a thermistor) (for example, not shown) is embedded in the base portion 129, for example. Based on the signal of this temperature sensor, the heating of the heater and the control of cooling by the water cooling tube 149 (hereinafter referred to as TMS; Temperature Management System) are performed so as to keep the temperature of the base portion 129 at a constant high temperature (set temperature). It has been.
- TMS Temperature Management System
- one end of the electromagnet winding 151 constituting the upper radial electromagnet 104 and the like is connected to the positive electrode 171a of the power supply 171 via the transistor 161 and the other end thereof is the current detection circuit 181 and the transistor 162. It is connected to the negative electrode 171b of the power supply 171 via.
- the transistors 161 and 162 are so-called power MOSFETs, and have a structure in which a diode is connected between the source and the drain thereof.
- the cathode terminal 161a of the diode is connected to the positive electrode 171a, and the anode terminal 161b is connected to one end of the electromagnet winding 151. Further, in the transistor 162, the cathode terminal 162a of the diode is connected to the current detection circuit 181 and the anode terminal 162b is connected to the negative electrode 171b.
- the diode 165 for current regeneration its cathode terminal 165a is connected to one end of the electromagnet winding 151, and its anode terminal 165b is connected to the negative electrode 171b.
- the cathode terminal 166a is connected to the positive electrode 171a, and the anode terminal 166b is connected to the other end of the electromagnet winding 151 via the current detection circuit 181. It has become so.
- the current detection circuit 181 is composed of, for example, a hall sensor type current sensor or an electric resistance element.
- the amplifier circuit 150 configured as described above corresponds to one electromagnet. Therefore, when the magnetic bearing is controlled by 5 axes and there are a total of 10 electromagnets 104, 105, 106A, and 106B, the same amplifier circuit 150 is configured for each of the electromagnets, and 10 amplifier circuits are provided for the power supply 171. 150 are connected in parallel.
- the amplifier control circuit 191 is composed of, for example, a digital signal processor unit (hereinafter referred to as a DSP unit) (hereinafter, referred to as a DSP unit) of the control device 200, and the amplifier control circuit 191 switches on / off of the transistors 161 and 162. It has become like.
- a DSP unit digital signal processor unit
- the amplifier control circuit 191 is adapted to compare the current value detected by the current detection circuit 181 (a signal reflecting this current value is referred to as a current detection signal 191c) with a predetermined current command value. Then, based on this comparison result, the magnitude of the pulse width (pulse width time Tp1 and Tp2) generated in the control cycle Ts, which is one cycle by PWM control, is determined. As a result, the gate drive signals 191a and 191b having this pulse width are output from the amplifier control circuit 191 to the gate terminals of the transistors 161 and 162.
- a high voltage of, for example, about 50 V is used as the power supply 171 so that the current flowing through the electromagnet winding 151 can be rapidly increased (or decreased).
- a normal capacitor is normally connected between the positive electrode 171a and the negative electrode 171b of the power supply 171 for the purpose of stabilizing the power supply 171 (not shown).
- the electromagnet current iL when both the transistors 161 and 162 are turned on, the current flowing through the electromagnet winding 151 (hereinafter referred to as the electromagnet current iL) increases, and when both are turned off, the electromagnet current iL decreases.
- flywheel current when one of the transistors 161 and 162 is turned on and the other is turned off, the so-called flywheel current is maintained.
- the hysteresis loss in the amplifier circuit 150 can be reduced, and the power consumption of the entire circuit can be suppressed to a low level.
- the transistors 161 and 162 by controlling the transistors 161 and 162 in this way, it is possible to reduce high frequency noise such as harmonics generated in the turbo molecular pump 100. Further, by measuring this flywheel current with the current detection circuit 181 it becomes possible to detect the electromagnet current iL flowing through the electromagnet winding 151.
- the transistors 161 and 162 are used only once in the control cycle Ts (for example, 100 ⁇ s) for the time corresponding to the pulse width time Tp1. Turn both on. Therefore, the electromagnet current iL during this period increases from the positive electrode 171a to the negative electrode 171b toward the current value iLmax (not shown) that can be passed through the transistors 161 and 162.
- both the transistors 161 and 162 are turned off only once in the control cycle Ts for the time corresponding to the pulse width time Tp2. .. Therefore, the electromagnet current iL during this period decreases from the negative electrode 171b to the positive electrode 171a toward the current value iLmin (not shown) that can be regenerated via the diodes 165 and 166.
- the turbo molecular pump 100 is configured as described above.
- the turbo molecular pump 100 is an example of a vacuum pump.
- the rotary wing 102 and the rotary body 103 are the rotors of the turbo molecular pump 100
- the fixed wing 123 and the fixed wing spacer 125 are the stators of the turbo molecular pump portion
- the screwed spacer 131 is It is a stator of the threaded groove pump part in the latter stage of the turbo molecular pump part.
- the outer cylinder 127 and the outer cylinder 127a are casings of the turbo molecular pump 100, and accommodate the above-mentioned rotor and stator.
- the temperature rising ring 301 is an annular member that heats up the gas flow path by the heat generated by the heater 302, and is made of the same material as the above-mentioned stator.
- the temperature rise ring 301 and the heater 302 are also used for the above-mentioned TMS.
- the temperature rising ring 301 is fixed to the above-mentioned stator so that heat can be transferred to the above-mentioned stator, and is also fixed to the outer cylinder 127a at the upper end thereof with a bolt or the like.
- the temperature rising ring 301 is separated from the base portion 129, a gap 303 is formed between the two, and the gap 303 insulates both of them. Further, the gap 303 is provided with a sealing 304.
- the temperature rising ring 301 is not directly fixed to the base portion 129.
- the threaded spacer 131 is not directly fixed to the base portion 129.
- an exhaust port 133 is fixed to the temperature rising ring 301, and an external pipe (not shown) is connected to the exhaust port 133. Then, the gas is transferred to the exhaust port 133 through the gas flow path between the temperature rising ring 301 and the threaded spacer 131, and is discharged to the external pipe through the exhaust port 133. Since the exhaust port 133 is a gas flow path and is similarly temperature-controlled, it is not directly fixed to the casing (outer cylinder 127a) and the base portion 129.
- FIG. 5 is a side view showing a turbo molecular pump 100 as a vacuum pump according to the first embodiment of the present invention.
- the exhaust port 133 is arranged so as to be inserted into an insertion hole 127b formed in the outer cylinder 127a, and the insertion hole 127b has heat insulation to the casing and workability at the time of assembling the pump 100.
- the size of the exhaust port 133 is larger than that of the exhaust port 133 so that the exhaust port 133 does not come into contact with the outer cylinder 127a.
- the strength is insufficient against the rotational force applied to the temperature rise ring 301 at the time of the above-mentioned failure. there is a possibility. If the strength of the connection portion is insufficient with respect to the rotational force, the rotational force is also applied to the exhaust port 133 fixed to the temperature rising ring 301, which may cause the above-mentioned problem. be.
- the pump 100 is provided with a rotation suppressing means for suppressing the rotation of the temperature rising ring 301 due to the rotational force of the casing.
- the rotation suppressing means includes a rotation regulating portion formed on the temperature rising ring 301, and a rotation regulating member fixed to the casing and abutting on the rotation regulating portion by a rotational force.
- FIG. 6 is a cross-sectional view of the turbo molecular pump shown in FIG. 1 (a diagram showing a cross section taken along the line AA in FIG. 1).
- the rotation restricting portion of the temperature rising ring 301 is a hole 301a along the radial direction of the pump 100 as shown in FIGS. 1 and 6, and the rotation restricting member is arranged in the hole 301a.
- a hole corresponding to the hole 301a is formed in the outer cylinder 127a
- the bolt 305 is fixed to the hole of the outer cylinder 127a by a screw connection
- the tip of the bolt 305 is inside the hole 301a. Is located in.
- a pin may be used instead of the bolt 305.
- the hole 301a does not penetrate the temperature rising ring 301.
- the holes 301a and the bolts 305 are provided along the radial direction, but may not be along the radial direction.
- the bolt 305 and the pin as the rotation restricting member can be installed from the outside of the casing after the rotor and the stator are housed inside the casing (outer cylinder 127a).
- a plurality of holes 301a and bolts 305 are provided at equal intervals.
- the number of holes 301a and bolts 305, and the diameter and material of the bolts 305 are selected based on the strength required for the rotational force at the time of the above-mentioned contact failure. That is, with the above-mentioned temperature riser ring 301, the strength is obtained so that the rotation of the temperature riser ring 301 does not substantially occur beyond the rotation angle until the rotation restricting member abuts on the rotation regulation portion due to the rotational force.
- the number of holes 301a and bolts 305, and the diameter and material of the bolts 305 are selected in consideration of the connection strength with the outer cylinder 127a.
- the motor 121 operates and the rotor rotates based on the control by the control device 200.
- the gas that has flowed in through the intake port 101 is transferred along the gas flow path between the rotor and the stator, and is discharged from the exhaust port 133 to the external pipe.
- the temperature rising ring 301 is connected to the exhaust port 133 to which the external pipe is connected, and the rotational force is directly applied due to the contact failure of the rotor during the rotation of the rotor. Or indirectly. Then, apart from the connection portion (directly or indirectly via another member) between the temperature rise ring 301 and the casing (outer cylinder 127a), the rotation of the temperature rise ring 301 due to the above-mentioned rotational force is suppressed.
- Rotation suppressing means holes 301a, bolts 305, etc.
- the exhaust port 133 has an insertion hole for the outer cylinder 127a. It may rotate until it comes into contact with the inner wall of 127b, and a large mechanical load may be applied to the external piping.
- the rotation of the exhaust port 133 is also suppressed, and the mechanical load applied to the external pipe connected to the exhaust port 133 is suppressed. ..
- Embodiment 2 In the vacuum pump according to the second embodiment of the present invention, a rotation suppressing means for suppressing the rotation of the temperature rising ring 301 due to the above-mentioned rotational force is provided with respect to the base portion 129 to which the casing (outer cylinder 127a) is fixed.
- the rotation suppressing means includes a rotation regulating portion formed on the temperature rising ring 301, and a rotation regulating member that protrudes in the axial direction from the base portion 129 and comes into contact with the rotation regulating portion by the rotational force. ..
- FIG. 7 is a vertical sectional view showing a turbo molecular pump 100 as a vacuum pump according to the second embodiment of the present invention.
- FIG. 8 is a cross-sectional view of the turbo molecular pump shown in FIG. 7 (a view showing a cross section taken along the line AA in FIG. 7).
- FIG. 9 is a perspective view showing an example of the rotation suppressing means according to the second embodiment.
- the rotation restricting portion of the temperature rising ring 301 is a notch 401a formed in the flange 401 of the temperature rising ring 301, as shown in FIGS. 7, 8 and 9, and the rotation is restricted.
- the member is a bolt 402 fixed to the base portion 129 along the axial direction.
- the bolt 402 is screw-coupled with a female screw formed in the hole of the base portion 129, and its head is arranged in the notch 401a.
- a pin may be used instead of the bolt 402.
- a hole may be provided instead of the notch 401a.
- a plurality of notches 401a and bolts 402 are provided at equal intervals.
- the number of notches 401a and bolts 402, and the diameter and material of the bolts 402 are selected based on the strength required for the rotational force at the time of the above-mentioned contact failure. That is, the notch 401a and the bolt 402 are provided with strength so that the rotation force causes the rotation restricting member to exceed the rotation angle until it comes into contact with the rotation restricting portion and the temperature rise ring 301 does not rotate substantially.
- the number, diameter and material of the bolt 402 are selected.
- the rotation restricting portion of the temperature rising ring 301 is a hole 301a, but a groove or a notch facing the casing may be used, and as another embodiment, a protrusion facing the casing. It may be a stepped portion or the like.
- the temperature rise ring 301 to which the rotational force is indirectly applied is provided as an annular member to which the rotational force is directly or indirectly applied due to the contact failure of the rotor during the rotation of the rotor.
- the above-mentioned rotation suppressing means is provided on the temperature rising ring 301, but instead, the above-mentioned rotation suppressing means may be provided on the annular member that does not require temperature control. Further, the above-mentioned rotation suppressing means may be provided on the annular member connected to the pipe connection portion for another external pipe, which is different from the exhaust port 133.
- the annular member is a member that does not require temperature control, it is not necessary to provide a gap between the rotation regulating portion and the rotation regulating member.
- the annular member such as the temperature rising ring 301 may be a single member or a member configured by connecting a plurality of members.
- the bolts 105 or pins may be arranged along the circumferential direction as described above and may be arranged in the axial direction.
- a protrusion, a step portion or the like facing the temperature rising ring 301 is provided in the casing, and when there is no contact defect described above, the casing is said to be applicable.
- a gap may be provided between the protrusion, the step portion, and the temperature rise ring 301, and the rotation of the temperature rise ring 301 due to the rotational force due to the above-mentioned contact failure may be suppressed.
- the temperature rising ring 301 and the threaded spacer 131 may be one member. That is, the threaded spacer 131 may have a shape including the temperature rising ring 301 and may be the above-mentioned annular member.
- the present invention is applicable to, for example, a vacuum pump such as a turbo molecular pump.
- turbo molecular pump (example of vacuum pump) 102 Rotor (part of an example of a rotor) 103 Rotating body (part of an example of rotor) 127 Outer cylinder (part of an example of casing) 127a Outer cylinder (part of an example of casing) 131 Spacer with screw (example of stator) 133 Exhaust port (an example of piping connection) 301 Temperature rise ring (an example of annular member) 301a hole (an example of rotation control unit) 305 bolts (an example of rotation control member) 401a Notch (an example of rotation control unit) 402 bolts (an example of rotation control member)
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Abstract
Description
このターボ分子ポンプ100の縦断面図を図1に示す。図1において、ターボ分子ポンプ100は、円筒状の外筒127の上端に吸気口101が形成されている。そして、外筒127の内方には、ガスを吸引排気するためのタービンブレードである複数の回転翼102(102a、102b、102c・・・)を周部に放射状かつ多段に形成した回転体103が備えられている。この回転体103の中心にはロータ軸113が取り付けられており、このロータ軸113は、例えば5軸制御の磁気軸受により空中に浮上支持かつ位置制御されている。回転体103は、一般的に、アルミニウム又はアルミニウム合金などの金属によって構成されている。
本発明の実施の形態2に係る真空ポンプでは、ケーシング(外筒127a)が固定されているベース部129に対する、上述の回転力による昇温リング301の回転を抑制する回転抑制手段が設けられている。当該実施の形態2では、その回転抑制手段は、昇温リング301に形成された回転規制部と、ベース部129から軸方向に突出しその回転力によって回転規制部に当接する回転規制部材とを備える。
102 回転翼(ロータの一例の一部)
103 回転体(ロータの一例の一部)
127 外筒(ケーシングの一例の一部)
127a 外筒(ケーシングの一例の一部)
131 ネジ付スペーサ(ステータの一例)
133 排気口(配管接続部の一例)
301 昇温リング(環状部材の一例)
301a 穴(回転規制部の一例)
305 ボルト(回転規制部材の一例)
401a 切り欠き(回転規制部の一例)
402 ボルト(回転規制部材の一例)
Claims (8)
- ロータと、
ステータと、
前記ロータおよび前記ステータを収容するケーシングと、
前記ロータの回転時における前記ロータの接触不具合によって回転力が直接的にまたは間接的に加わる環状部材と、
前記環状部材に接続しており外部配管を接続される配管接続部と、
前記環状部材と前記ケーシングとの接続部分とは別に、前記回転力による前記環状部材の回転を抑制する回転抑制手段と、
を備えることを特徴とする真空ポンプ。 - 前記回転抑制手段は、前記環状部材に形成された回転規制部と、前記ケーシングに固定され前記回転力によって前記回転規制部に当接する回転規制部材とを備えることを特徴とする請求項1記載の真空ポンプ。
- 前記環状部材は、ヒータの発熱でガス流路を昇温する昇温リングであり、
前記回転規制部は、穴であり、
前記回転規制部材は、前記穴内に配置されたボルトまたはピンであり、
前記接触不具合のないときに、前記穴と前記ボルトまたは前記ピンとの間には、空隙があること、
を特徴とする請求項2記載の真空ポンプ。 - 前記環状部材は、ヒータの発熱でガス流路を昇温する昇温リングであり、
前記回転抑制手段は、前記昇温リングおよび前記ケーシングのうちの一方に、前記昇温リングおよび前記ケーシングのうちの他方に対向する突起または段差部を備え、
前記接触不具合のないときに、前記突起または前記段差部と、前記昇温リングおよび前記ケーシングのうちの他方との間には、空隙があること、
を特徴とする請求項1記載の真空ポンプ。 - ベース部をさらに備え、
前記回転抑制手段は、前記環状部材に形成された回転規制部と、前記ベース部から軸方向に突出し前記回転力によって前記回転規制部に当接する回転規制部材とを備えることを特徴とする請求項1記載の真空ポンプ。 - 前記環状部材は、フランジと、前記フランジに形成された孔または切り欠きとを備え、 前記回転規制部は、前記孔または前記切り欠きであり、
前記回転規制部材は、前記軸方向に沿って前記ベース部に固定されたボルトまたはピンであること、
を特徴とする請求項5記載の真空ポンプ。 - 前記環状部材は、ヒータの発熱でガス流路を昇温する昇温リングであることを特徴とする請求項1、請求項2、請求項5、および請求項6のうちのいずれか1項記載の真空ポンプ。
- 前記配管接続部は、排気口であることを特徴とする請求項1から請求項7のうちのいずれか1項記載の真空ポンプ。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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CN202180075713.2A CN116783391A (zh) | 2020-12-14 | 2021-12-03 | 真空泵 |
KR1020237017100A KR20230116781A (ko) | 2020-12-14 | 2021-12-03 | 진공 펌프 |
US18/254,581 US20240026889A1 (en) | 2020-12-14 | 2021-12-03 | Vacuum pump |
EP21906398.9A EP4261416A1 (en) | 2020-12-14 | 2021-12-03 | Vacuum pump |
IL303178A IL303178A (en) | 2020-12-14 | 2021-12-03 | Vacuum pump |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2020-206436 | 2020-12-14 | ||
JP2020206436 | 2020-12-14 | ||
JP2021034164A JP2022094272A (ja) | 2020-12-14 | 2021-03-04 | 真空ポンプ |
JP2021-034164 | 2021-03-04 |
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WO2022131035A1 true WO2022131035A1 (ja) | 2022-06-23 |
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PCT/JP2021/044570 WO2022131035A1 (ja) | 2020-12-14 | 2021-12-03 | 真空ポンプ |
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US (1) | US20240026889A1 (ja) |
EP (1) | EP4261416A1 (ja) |
KR (1) | KR20230116781A (ja) |
IL (1) | IL303178A (ja) |
WO (1) | WO2022131035A1 (ja) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010031678A (ja) * | 2008-07-25 | 2010-02-12 | Shimadzu Corp | 回転真空ポンプ |
JP2019090384A (ja) | 2017-11-16 | 2019-06-13 | エドワーズ株式会社 | 真空ポンプ、および真空ポンプに備わる昇温ステータ、排気口部材、加熱手段 |
JP2019178655A (ja) * | 2018-03-30 | 2019-10-17 | エドワーズ株式会社 | 真空ポンプ |
-
2021
- 2021-12-03 IL IL303178A patent/IL303178A/en unknown
- 2021-12-03 EP EP21906398.9A patent/EP4261416A1/en active Pending
- 2021-12-03 US US18/254,581 patent/US20240026889A1/en active Pending
- 2021-12-03 KR KR1020237017100A patent/KR20230116781A/ko unknown
- 2021-12-03 WO PCT/JP2021/044570 patent/WO2022131035A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010031678A (ja) * | 2008-07-25 | 2010-02-12 | Shimadzu Corp | 回転真空ポンプ |
JP2019090384A (ja) | 2017-11-16 | 2019-06-13 | エドワーズ株式会社 | 真空ポンプ、および真空ポンプに備わる昇温ステータ、排気口部材、加熱手段 |
JP2019178655A (ja) * | 2018-03-30 | 2019-10-17 | エドワーズ株式会社 | 真空ポンプ |
Also Published As
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US20240026889A1 (en) | 2024-01-25 |
IL303178A (en) | 2023-07-01 |
KR20230116781A (ko) | 2023-08-04 |
EP4261416A1 (en) | 2023-10-18 |
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