WO2022158336A1 - 真空ポンプ、回転体、カバー部および回転体の製造方法 - Google Patents
真空ポンプ、回転体、カバー部および回転体の製造方法 Download PDFInfo
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- WO2022158336A1 WO2022158336A1 PCT/JP2022/000595 JP2022000595W WO2022158336A1 WO 2022158336 A1 WO2022158336 A1 WO 2022158336A1 JP 2022000595 W JP2022000595 W JP 2022000595W WO 2022158336 A1 WO2022158336 A1 WO 2022158336A1
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- Prior art keywords
- rotating body
- cover
- fixed
- hole
- shaft
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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
- F04D19/042—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
-
- 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
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials 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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/662—Balancing of rotors
-
- 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
- F05D2260/95—Preventing corrosion
Definitions
- the present invention relates to a vacuum pump, a rotating body, a cover part, and a manufacturing method of the rotating body. Specifically, a vacuum pump having corrosion resistance against exhaust gas while correcting the balance of the rotating body by covering the top of the shaft of the rotating body with a cover part fixed to the rotating body, the rotating body, the cover part, and the rotating body It relates to the manufacturing method of the body.
- Vacuum pumps are equipped with rotor blades and fixed blades fixed to a rotating shaft (shaft).
- the rotating shaft is rotated at high speed, and high vacuum is required due to the interaction between the rotating blades and fixed blades rotating at high speed.
- the air in the process chamber is evacuated.
- Exhausted gases include, for example, chlorine and fluorine sulfide corrosive gases, and if the shaft comes into contact with these corrosive gases, for example, dust may be generated from the shaft surface.
- a corrosion-preventing film is formed by electroless plating on the inner and outer peripheral surfaces of the rotor 8 (rotary blade), or a corrosion-resistant adhesive or paint is applied. This prevented corrosion.
- Patent Literature 1 discloses a vacuum pump capable of balancing the rotor over a long period of time while protecting the rotor of a turbomolecular pump from corrosive gases by applying anti-corrosion treatment to the rotor. .
- the top of the shaft is the part that first comes into contact with the corrosive gas taken in from the intake port, and is most likely to be affected by the corrosive gas, requiring some kind of countermeasure.
- the top of the shaft comes into contact with the corrosive gas and dust is generated, it may flow back from the intake port to the process chamber, adversely affecting the quality of the product (wafer).
- the top portion of the rotating shaft is subjected to anti-corrosion treatment, it inevitably affects the balance of the rotating body composed of the shaft and the rotor blades fixed to the shaft.
- the present invention provides a vacuum pump, a rotating body, a cover, and a rotating body that prevents dust generation from the shaft by avoiding contact between the top of the shaft and corrosive gas, and has a function of correcting the balance of the rotating body.
- the object is to provide a manufacturing method.
- a rotating shaft that is rotatably supported; and a cover portion fixed to the rotating body so as to cover the top portion of the rotating shaft and the through hole, wherein the cover portion is an anchor of the rotating body.
- a vacuum pump characterized by having a balance correction function for correcting the balance and having corrosion resistance to exhaust gas.
- the vacuum pump according to the first aspect wherein the corrosion resistance of the cover portion to the exhaust gas is achieved by performing a corrosion-resistant surface treatment. do.
- the vacuum pump according to claim 1 or 2 is characterized in that the cover portion has a portion that is fitted with a tool for fixing or supporting the rotating body. offer.
- the balance correcting function is performed by a balance correcting weight arranged in a concave portion provided in the cover portion, and the balance correcting weight has corrosion resistance against exhaust gas.
- a vacuum pump according to claim 1, claim 2 or claim 3 is provided.
- the present invention according to claim 5 provides the vacuum pump according to claim 4, characterized in that the balance correction weight is subjected to a surface treatment that is resistant to corrosion against exhaust gas.
- a rotary shaft that is rotatably supported; , further comprising a cover fixed to the rotating body so as to cover the top of the rotating shaft and the through hole, wherein the cover corrects imbalance of the rotating body
- a rotating body characterized by having a balance correcting function for and having corrosion resistance against exhaust gas.
- a rotary shaft that is rotatably supported; A cover portion fixed to the rotating body so as to cover the top portion of the rotating shaft and the through hole provided with a balance correction function for correcting the imbalance of the rotating body, Further, the cover part is characterized by having corrosion resistance against exhaust gas.
- a rotating shaft that is rotatably supported; wherein a cover portion having corrosion resistance to exhaust gas is fixed to the rotating body so as to cover the top portion of the rotating shaft and the through hole, and the cover portion is fixed
- a method for manufacturing a rotating body characterized by correcting the imbalance of the rotating body under certain conditions.
- the corrosive gas is prevented from coming into contact with the shaft, particularly the top portion of the shaft, and , the balance of the rotating body can be corrected by the balance correction function provided in the cover.
- FIG. 1 is a diagram showing a schematic configuration example of a turbo-molecular pump according to an embodiment of the present invention
- FIG. It is the figure which showed the circuit diagram of the amplifier circuit used by embodiment of this invention.
- 4 is a time chart showing control when the current command value is smaller than the detected value in the embodiment of the present invention
- 4 is a time chart showing control when a current command value is greater than a detected value in the embodiment of the present invention
- FIG. 8 is a perspective view of the cover shown in FIG. 7; It is a figure for demonstrating the rotor assembly process (before fixing an armature disk) in this embodiment. It is a figure for demonstrating the rotor assembly process (after fixing an armature disk) in this embodiment. It is a figure for demonstrating the rotor assembly process (shaft fastening) in this embodiment.
- a vacuum pump according to an embodiment of the present invention has a rotating shaft and a through hole passing through the top of the rotating shaft. and a cover portion fixed to the rotating body so as to cover the top portion of the rotating shaft and the through hole, the cover portion being a balance for correcting imbalance of the rotating body. It has a corrective function and is corrosion resistant to exhaust gases.
- the cover portion by providing the cover portion, contact between the top portion of the shaft (top portion of the rotor shaft) and corrosive gas can be avoided, and dust generation from the shaft can be prevented. Further, since the cover has a function of correcting the balance of the rotating body, the imbalance of the rotating body can be corrected even if the cover is provided on the top of the shaft.
- FIG. 1 Details of Embodiments Preferred embodiments of the present invention will now be described in detail with reference to FIGS. 1 to 11.
- FIG. 5 Details of Embodiments Preferred embodiments of the present invention will now be described in detail with reference to FIGS. 1 to 11.
- FIG. 1 A longitudinal sectional view of this turbomolecular pump (vacuum pump) 100 is shown in FIG.
- a turbo-molecular pump 100 has an intake port 101 formed at the upper end of a cylindrical outer cylinder 127 .
- a rotating body 103 having a plurality of rotating blades 102 (102a, 102b, 102c, . is provided inside the outer cylinder 127.
- a rotor shaft 113 is attached to the center of the rotor 103, and the rotor shaft 113 is levitated in the air and position-controlled by, for example, a 5-axis control magnetic bearing.
- the rotor 103 is generally made of metal such as aluminum or aluminum alloy.
- the upper radial electromagnet 104 has four electromagnets arranged in pairs on the X-axis and the Y-axis.
- Four upper radial sensors 107 are provided adjacent to the upper radial electromagnets 104 and corresponding to the upper radial electromagnets 104, respectively.
- the upper radial direction sensor 107 is, for example, an inductance sensor or an eddy current sensor having a conductive winding, and detects the position of the rotor shaft 113 based on the change in the inductance of this conductive winding, which changes according to the position of the rotor shaft 113 .
- This upper radial sensor 107 is configured to detect the radial displacement of the rotor shaft 113 , ie the rotor 103 fixed thereto, and send it to the controller 200 .
- a compensation circuit having a PID adjustment function generates an excitation control command signal for the upper radial electromagnet 104 based on the position signal detected by the upper radial sensor 107, as shown in FIG.
- An amplifier circuit 150 controls the excitation of the upper radial electromagnet 104 based on the excitation control command signal, thereby adjusting the upper radial position of the rotor shaft 113 .
- the rotor shaft 113 is made of a high magnetic permeability material (iron, stainless steel, etc.) or the like, and is attracted by the magnetic force of the upper radial electromagnet 104 . Such adjustments are made independently in the X-axis direction and the Y-axis direction.
- the lower radial electromagnet 105 and the lower radial sensor 108 are arranged in the same manner as the upper radial electromagnet 104 and the upper radial sensor 107 so that the lower radial position of the rotor shaft 113 is set to the upper radial position. adjusted in the same way.
- the axial electromagnets 106A and 106B are arranged so as to vertically sandwich a disk-shaped metal disk 111 provided below 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 axial displacement of the rotor shaft 113 and is configured to transmit its axial position signal to the controller 200 .
- a compensation circuit having, for example, a PID adjustment function generates excitation control command signals for the axial electromagnets 106A and 106B based on the axial position signal detected by the axial sensor 109. Based on these excitation control command signals, the amplifier circuit 150 controls the excitation of the axial electromagnets 106A and 106B, respectively. , 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 on the metal disk 111 by the axial electromagnets 106A and 106B, magnetically levitates the rotor shaft 113 in the axial direction, and holds the rotor shaft 113 in the space without contact. ing.
- the amplifier circuit 150 that controls the excitation of the upper radial electromagnet 104, the lower radial electromagnet 105, and the axial electromagnets 106A and 106B will be described later.
- the motor 121 has a plurality of magnetic poles circumferentially arranged 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 between the magnetic poles and the rotor shaft 113 .
- the motor 121 incorporates a rotation speed sensor (not shown) such as a Hall element, resolver, encoder, etc., and the rotation speed of the rotor shaft 113 is detected by the detection signal of this rotation speed sensor.
- phase sensor (not shown) is attached, for example, near the lower radial direction sensor 108 to detect the phase of rotation of the rotor shaft 113 .
- the control device 200 detects the position of the magnetic pole using both the detection signals from the phase sensor and the rotational speed sensor.
- a plurality of fixed wings 123 (123a, 123b, 123c%) are arranged with a slight gap from the rotary wings 102 (102a, 102b, 102c).
- the rotor blades 102 (102a, 102b, 102c, . . . ) are inclined at a predetermined angle from a plane perpendicular to the axis of the rotor shaft 113 in order to move molecules of the exhaust gas downward by collision.
- the fixed wings 123 (123a, 123b, 123c, . . . ) are made of metal such as aluminum, iron, stainless steel, or copper, or metal such as an alloy containing these metals as components.
- the fixed blades 123 are also inclined at a predetermined angle from a plane perpendicular to the axis of the rotor shaft 113, and are arranged inwardly of the outer cylinder 127 in a staggered manner with the stages of the rotary blades 102. ing.
- the outer peripheral end of the fixed wing 123 is supported by being inserted between a plurality of stacked fixed wing spacers 125 (125a, 125b, 125c, . . . ).
- the fixed wing spacer 125 is a ring-shaped member, and is made of metal such as aluminum, iron, stainless steel, copper, or an alloy containing these metals as components.
- An outer cylinder 127 is fixed to the outer circumference of the stationary blade spacer 125 with a small gap therebetween.
- a base portion 129 is provided at the bottom of the outer cylinder 127 .
- An exhaust port 133 is formed in the base portion 129 and communicates with the outside. Exhaust gas that has entered the intake port 101 from the chamber (vacuum chamber) side and has been transferred to the base portion 129 is sent to the exhaust port 133 .
- a threaded spacer 131 is provided between the lower portion of the stationary blade spacer 125 and the base portion 129 depending on the application of the turbomolecular pump 100 .
- 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, and has a plurality of helical thread grooves 131a on its inner peripheral surface. It is stipulated.
- the spiral direction of the thread groove 131 a is the direction in which the molecules of the exhaust gas move toward the exhaust port 133 when they move in the rotation direction of the rotor 103 .
- a cylindrical portion 102d is suspended from the lowermost portion of the rotor 103 following the rotor blades 102 (102a, 102b, 102c, . . . ).
- the outer peripheral surface of the cylindrical portion 102d is cylindrical and protrudes toward the inner peripheral surface of the threaded spacer 131, and is adjacent to the inner peripheral surface of the threaded spacer 131 with a predetermined gap therebetween.
- 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 that constitutes the base portion of the turbomolecular pump 100, and is generally made of metal such as iron, aluminum, or stainless steel.
- the base portion 129 physically holds the turbo-molecular pump 100 and also functions as a heat conduction path. Therefore, a metal having high rigidity and high thermal conductivity such as iron, aluminum, or copper is used. is desirable.
- the temperature of the rotor blades 102 rises due to frictional heat generated when the exhaust gas contacts the rotor blades 102, conduction of heat generated by the motor 121, and the like. It is transmitted to the stationary blade 123 side by conduction by molecules or the like.
- the fixed blade spacers 125 are joined to each other at their outer peripheral portions, and transmit the heat received by the fixed blades 123 from the rotary blades 102 and the frictional heat generated when the exhaust gas contacts the fixed blades 123 to the outside.
- the threaded spacer 131 is arranged on the outer circumference of the cylindrical portion 102d of the rotating body 103, and the inner peripheral surface of the threaded spacer 131 is provided with the thread groove 131a.
- a thread groove is formed on the outer peripheral surface of the cylindrical portion 102d, and a spacer having a cylindrical inner peripheral surface is arranged around it.
- the gas sucked from the intake port 101 may move the upper radial electromagnet 104, the upper radial sensor 107, the motor 121, the lower radial electromagnet 105, the lower radial sensor 108, the shaft
- the electrical section is surrounded by a stator column 122, and the interior of the stator column 122 is maintained at a predetermined pressure with purge gas. It may drip.
- a pipe (not shown) is arranged in the base portion 129, and the purge gas is introduced through this pipe.
- the introduced purge gas is delivered to the exhaust port 133 through gaps between the protective bearing 120 and the rotor shaft 113 , between the rotor and stator of the motor 121 , and between the stator column 122 and the inner cylindrical portion of the rotor blade 102 .
- the turbo-molecular pump 100 requires model identification and control based on individually adjusted unique parameters (eg, various characteristics corresponding to the model).
- the turbomolecular pump 100 has an electronic circuit section 141 in its body.
- the electronic circuit section 141 includes a semiconductor memory such as an EEP-ROM, electronic components such as semiconductor elements for accessing the same, a board 143 for mounting them, and the like.
- the electronic circuit section 141 is accommodated, for example, below a rotational speed sensor (not shown) near the center of a base section 129 that constitutes the lower portion of the turbo-molecular pump 100 and is closed by an airtight bottom cover 145 .
- some of the process gases introduced into the chamber have the property of becoming solid when their pressure exceeds a predetermined value or their temperature falls below a predetermined value. be.
- the pressure of the exhaust gas is lowest at the inlet 101 and highest at the outlet 133 .
- the process gas becomes solid and turbo molecules are formed. It adheres and deposits inside the pump 100 .
- a heater (not shown) or an annular water cooling pipe 149 is wound around the outer periphery of the base portion 129 or the like, and a temperature sensor (for example, a thermistor) (not shown) is embedded in the base portion 129. Based on the signal from the temperature sensor, the heating of the heater and the cooling control by the water cooling pipe 149 are controlled (hereinafter referred to as TMS: Temperature Management System) so as to keep the temperature of the base portion 129 at a constant high temperature (set temperature). It is
- the amplifier circuit 150 that controls the excitation of the upper radial electromagnet 104, the lower radial electromagnet 105, and the axial electromagnets 106A and 106B will be described.
- a circuit diagram of this amplifier circuit 150 is shown in FIG.
- an electromagnet winding 151 that constitutes the upper radial electromagnet 104 and the like has one end connected to a positive electrode 171a of a power supply 171 via a transistor 161, and the other end connected to a current detection circuit 181 and a transistor 162. is connected to the negative electrode 171b of the power source 171 via the .
- the transistors 161 and 162 are so-called power MOSFETs and have a structure in which a diode is connected between their source and drain.
- the transistor 161 has its diode cathode terminal 161 a connected to the positive electrode 171 a and anode terminal 161 b connected to one end of the electromagnet winding 151 .
- the transistor 162 has a diode cathode terminal 162a connected to the current detection circuit 181 and an anode terminal 162b connected to the negative electrode 171b.
- the diode 165 for current regeneration has a cathode terminal 165a connected to one end of the electromagnet winding 151 and an anode terminal 165b connected to the negative electrode 171b.
- the diode 166 for current regeneration has its cathode terminal 166a connected to the positive electrode 171a and its anode terminal 166b 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, if the magnetic bearing is controlled by five axes and there are a total of ten electromagnets 104, 105, 106A, and 106B, a similar amplifier circuit 150 is configured for each of the electromagnets, and ten amplifier circuits are provided for the power supply 171. 150 are connected in parallel.
- the amplifier control circuit 191 is configured by, for example, a digital signal processor section (hereinafter referred to as a DSP section) not shown in the control device 200, and this amplifier control circuit 191 switches the transistors 161 and 162 on/off. It's like
- the amplifier control circuit 191 compares the current value detected by the current detection circuit 181 (a signal reflecting this current value is called a current detection signal 191c) and a predetermined current command value. Then, based on this comparison result, the magnitude of the pulse width (pulse width times Tp1, Tp2) to be generated within the control cycle Ts, which is one cycle of PWM control, is determined. As a result, the gate drive signals 191 a and 191 b 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 about 50 V is used as the power source 171 so that the current flowing through the electromagnet winding 151 can be rapidly increased (or decreased).
- a capacitor is normally connected between the positive electrode 171a and the negative electrode 171b of the power source 171 for stabilizing the power source 171 (not shown).
- electromagnet current iL the current flowing through the electromagnet winding 151
- electromagnet current iL the current flowing through the electromagnet winding 151
- flywheel current is held.
- the hysteresis loss in the amplifier circuit 150 can be reduced, and the power consumption of the entire circuit can be suppressed.
- high-frequency noise such as harmonics generated in the turbo-molecular pump 100 can be reduced.
- the electromagnet current iL flowing through the electromagnet winding 151 can be detected.
- the transistors 161 and 162 are turned off only once during the control cycle Ts (for example, 100 ⁇ s) for the time corresponding to the pulse width time Tp1. turn on both. Therefore, the electromagnet current iL during this period increases from the positive electrode 171a to the negative electrode 171b toward a current value iLmax (not shown) that can flow through the transistors 161,162.
- 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 as shown in FIG. . Therefore, the electromagnet current iL during this period decreases from the negative electrode 171b to the positive electrode 171a toward a current value iLmin (not shown) that can be regenerated via the diodes 165,166.
- either one of the transistors 161 and 162 is turned on after the pulse width times Tp1 and Tp2 have elapsed. Therefore, the flywheel current is held in the amplifier circuit 150 during this period.
- FIG. 5 is a diagram showing a schematic configuration example including a cover portion 500 of a vacuum pump (turbo-molecular pump) according to this embodiment.
- FIG. 6 is a diagram showing a schematic configuration example of a rotating body according to the present embodiment.
- the cover portion 500 is installed so as to cover the rotor shaft top portion 210 of the rotor shaft 113 .
- the cover portion 500 By installing the cover portion 500, the rotor shaft top portion 210 and the through holes 220 formed in the rotor blades 102 (102a, 102b, 102c, . . . ) for passing the rotor shaft top portion 210 are completely covered. can be done.
- the cover portion 500 is fixed to the rotor blade 102 with fastening bolts 560 . Since the cover part 500 comes into contact with the process gas, it is preferable that the cover part 500 be subjected to corrosion-resistant surface treatment.
- the cover portion 500 can prevent contact between the process gas introduced from the intake port 101 and the rotor shaft top portion 210 , and further prevent the process gas from entering the inside through the through hole 220 .
- FIG. 7 is a diagram showing a schematic configuration example of the cover portion 500 according to the embodiment of the present invention
- FIG. 8 is a perspective view of the cover portion 500 shown in FIG.
- the cover portion 500 is shaped like a silk hat to cover the rotor shaft top portion 210 and the through hole 220 and is formed of a cap portion 510 and a washer portion 520 . Since this cover part 500 also has a function of balancing, it is desirable that it be concentric with the rotor shaft 113 and be a perfect circle as much as possible.
- Cap portion 510 is shaped to engage the shape of rotor top 210 to cover rotor top 210 .
- the washer portion 520 not only fixes the cover portion 500 and the rotor blade 102, but also functions to fasten the rotor shaft 102 and the rotor shaft 113, and has a plurality of (eight in this embodiment) through-holes for bolts. 530 is provided. Note that the number of bolt through holes 530 is not limited to eight, and may be other numbers such as two, four, and six. The bolt through-hole 530 penetrates the washer portion 520, and when the cover portion 500 is installed, the cover portion, the rotor blade 102 and the rotor shaft 113 are fixed (fastened) through the fastening bolt 560 (rotor shaft 113 screws on the side).
- the rotor blade 102 side may be threaded. Since the fastening bolts 560 come into contact with the process gas, it is desirable that the fastening bolts 560 be subjected to corrosion-resistant surface treatment or made of a corrosion-resistant material.
- the washer portion 520 is further provided with a balance weight screw hole 540 .
- 24 balance weight screw holes 540 are provided, but this number can be set as appropriate.
- the balance weight screw hole 540 is internally threaded for attaching the balance weight screw 570 .
- FIG. 7 shows the balance weight screw 570 attached to the balance weight screw hole 540 .
- the balance weight screw 570 is preferably corrosion resistant since it contacts the process gas. For example, it may be subjected to a corrosion-resistant surface treatment.
- the cover portion 500 has the function of avoiding contact between the rotor shaft top portion 210 and the process gas, and of correcting the balance of the rotating body when the cover portion is attached.
- a fitting portion 550 is provided at the top of the cover portion 500 .
- the fitting portion 550 is shaped to be fitted with a predetermined tool in the process of assembling the rotor blade 102 , and by fitting with the tool, the rotor blade 102 is supported and fixed via the cover portion 500 . It can play a role in the assembling process of the rotating body, which will be described later.
- the material of the cover portion 500 is preferably a material that is more corrosion resistant than the rotor shaft 113 (rotor shaft top portion 210).
- SUS316 which is highly resistant to corrosion among stainless steels, can be used as the material of the cover portion 500 .
- FIG. 9 is a rotor assembly process (before armature disk is fixed) in this embodiment
- FIG. 10 is a rotor assembly process (after armature disk is fixed) in this embodiment
- FIG. 11 is a rotor in this embodiment. It is a figure for demonstrating an assembly
- the washer 300, the armature disk 310 and the nut 320 are sequentially assembled before the armature disk 310 is fixed.
- the washer 300 is for alignment and also for the purpose of preventing the wraparound of magnetic flux from the armature disk 310 .
- the armature disk 310 is a disk made of a magnetic material and for exerting an attractive force with an electromagnet.
- a nut 320 tightens and secures the armature disc 310 .
- the nut 320 is tightened with the tool 700 to fix the washer 300 and the armature disc 310 .
- the cover portion 500 is fixed by the tool 600 in order to prevent the rotor shaft 113 from rotating and making it impossible to tighten.
- This tool 600 has a shape that fits into a fitting portion 550 provided on the top of the cover portion 500 . Since the cover portion 500 is fixed (fastened) to the rotor blades 102 and the rotor shaft 113, by fixing the fitting portion 550 provided at the top of the cover portion 500 with the tool 600, the rotor blades Nut 320 can be easily tightened without rotating 102 and rotor shaft 113 .
- fastening bolt 560 is fastened using tool 800 .
- the cover portion 500 is fixed by the tool 600 in order to prevent the rotor shaft 113 from rotating and making it impossible to tighten.
- the cover portion 500, the rotor blades 102 and the rotor shaft 113 can be fastened easily and reliably.
- turbomolecular pump vacuum pump
- Intake port 102
- Rotor blade 102d
- Cylindrical portion 103
- Rotor 113 Rotor shaft 123
- Fixed blade 125
- Fixed blade spacer 127
- Outer cylinder 129
- Threaded spacer 131a Screw groove 133
- Control device 210
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Non-Positive Displacement Air Blowers (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Rotary Pumps (AREA)
Abstract
Description
詳しくは、回転体のシャフトの頂部を回転体に固定されるカバー部により覆うことにより、回転体のバランス修正を行いつつ、排気ガスに対する耐腐食性を有する真空ポンプ、回転体、カバー部および回転体の製造方法に関する。
例えば、回転翼と回転軸(シャフト)の締結構造として、シャフト(ロータ軸)の頂部が回転翼ならびにバランスを取るための座金から突出するような構造がある。
これに対して、特許文献1に記載されているように、ロータ8(回転翼)の内外周面に無電解メッキにより腐食防止皮膜を形成したり、耐腐食性の接着剤または塗料を塗布することにより、腐食を防止していた。
一方、回転軸の頂部に耐腐食処理を施すと、シャフトとシャフトに固定された回転翼とからなる回転体のバランスに不可避的に影響を与えてしまうことになる。
請求項2記載の本願発明では、前記カバー部の排気ガスに対する耐腐食性は、耐腐食性の表面処理を施してあることにより達成することを特徴とする請求項1に記載の真空ポンプを提供する。
請求項3記載の本願発明では、前記カバー部は、前記回転体を固定または支持するための工具と嵌合する部分を備えることを特徴とする請求項1または請求項2に記載の真空ポンプを提供する。
請求項4記載の本願発明では、前記バランス修正機能は、前記カバー部に設けられた凹部に配置されたバランス修正錘により行われ、該バランス修正錘は排気ガスに対する耐腐食性を有することを特徴とする請求項1、請求項2または請求項3に記載の真空ポンプを提供する。
請求項5記載の本願発明では、前記バランス修正錘は、排気ガスに対する耐腐食性の表面処理を施してあることを特徴とする請求項4に記載の真空ポンプを提供する。
請求項6記載の本願発明では、回転可能に支持された回転軸と、前記回転軸の頂部を貫通させる貫通孔を有し、該貫通孔を前記頂部に貫通させて固定される回転翼と、を備えた回転体であって、前記回転軸の頂部と前記貫通孔を覆うように、前記回転体に固定されるカバー部をさらに備え、前記カバー部は、前記回転体のアンバランスを修正するためのバランス修正機能を備え、かつ、排気ガスに対する耐腐食性を有することを特徴とする回転体を提供する。
請求項7記載の本願発明では、回転可能に支持された回転軸と、前記回転軸の頂部を貫通させる貫通孔を有し、該貫通孔を前記頂部に貫通させて固定される回転翼と、を備えた回転体の前記回転軸の頂部と前記貫通孔を覆うように、前記回転体に固定されるカバー部であって、前記回転体のアンバランスを修正するためのバランス修正機能を備え、かつ、排気ガスに対する耐腐食性を有することを特徴とするカバー部を提供する。
請求項8記載の本願発明では、回転可能に支持された回転軸と、前記回転軸の頂部を貫通させる貫通孔を有し、該貫通孔を前記頂部に貫通させて固定される回転翼と、を備えた回転体の製造方法であって、排気ガスに対する耐腐食性を有するカバー部を前記回転軸の頂部と前記貫通孔を覆うように、前記回転体に固定し、前記カバー部を固定した状態で前記回転体のアンバランスを修正することを特徴とする回転体の製造方法を提供する。
本発明の実施形態に係る真空ポンプでは、回転軸と、この回転軸の頂部を貫通させる貫通孔を有し、該貫通孔を頂部に貫通させて固定される回転翼と、を備えた回転体と、回転軸の頂部と貫通孔を覆うように、回転体に固定されるカバー部とを備えており、カバー部は、回転体のアンバランスを修正するためのバランス修正機能を備え、かつ、排気ガスに対する耐腐食性を有している。
以下、本発明の好適な実施形態について、図1から図11を参照して詳細に説明する。
なお、本実施形態の特徴部分であるカバー部500については、図5から図8で詳細に説明する。
図5に示すように、カバー部500は、ロータ軸113のロータ軸頂部210に被せるように設置される。このカバー部500を設置することで、ロータ軸頂部210及びこのロータ軸頂部210を貫通させるために回転翼102(102a、102b、102c・・・)に開けられた貫通孔220を完全に覆うことができる。このカバー部500は、締結用ボルト560により回転翼102に固定される。
このカバー部500は、プロセスガスと接触するため、耐腐食性の表面処理を施すことが好ましい。
このカバー部500により、吸気口101から取り入れたプロセスガスとロータ軸頂部210との接触を回避でき、また貫通孔220を通って更に内部にプロセスガスが入り込むことを防止することができる。
カバー部500は、ロータ軸頂部210及び貫通孔220覆うためにシルクハットのような形状をしており、キャップ部510と座金部520とから形成されている。このカバー部500は、バランスを取る機能もあるため、可能な限りロータ軸113と同心であり、かつ真円であることが望ましい。
キャップ部510は、ロータ頂部210を覆うために、ロータ頂部210の形状と係合する形状になっている。
更に、座金部520は、カバー部500と回転翼102とを固定するのみならず、回転翼102とロータ軸113を締結する働きをし、複数(本実施例では8箇所)のボルト用貫通孔530が設けられている。なお、このボルト用貫通孔530は8箇所に限定されるものでなく、例えば、2箇所、4箇所、6箇所など他の個数であってもよい。
このボルト用貫通孔530は、座金部520を貫通しており、カバー部500の設置時に、締結用ボルト560を通してカバー部と回転翼102およびロータ軸113とを固定(締結)する(ロータ軸113側にネジが切ってある)。
なお、カバー部500と回転翼102の固定方法として、回転翼102側にネジを切ってあっても良い。
なお、この締結用ボルト560は、プロセスガスと接触するため、耐腐食の表面処理を行うか、耐腐食性のある素材とすることが望ましい。
このバランス錘用ネジ穴540には、バランス錘用ネジ570を取り付けるため、内部にネジが切ってある。図7には、バランス錘用ネジ穴540に、バランス錘用ネジ570を取り付けたところを示している。
このバランス錘用ネジ穴540に、バランスを調整しながら、バランス錘用ネジ570を取り付けることで、高速回転する回転体(回転翼102及びロータ軸113)のバランスを修正することができる。
なお、本実施形態では、カバー部500を固定した状態でアンバランスを修正することができる。
このように、カバー部500は、ロータ軸頂部210とプロセスガスの接触を回避し、かつカバー部を取り付けた際の回転体のバランスを修正する機能を備えている。
図9は、本実施形態における回転体組付工程(アーマチャディスク固定前)、図10は、本実施形態における回転体組付工程(アーマチャディスク固定後)、図11は、本実施形態における回転体組付工程(シャフト締結)を説明するための図である。
ワッシャ300は、位置合わせを行うためのものであり、アーマチャディスク310からの磁束の回り込みを防ぐ目的もある。
アーマチャディスク310は、磁性材よりなり、電磁石によって吸引力を働かせるためのディスクである。
ナット320は、アーマチャディスク310を締め付けて固定する。
カバー部500は、回転翼102およびロータ軸113と固定(締結)された状態になっているため、カバー部500の頂部に設けた嵌合部550が工具600で固定されることによって、回転翼102およびロータ軸113が回転することなくナット320を容易に締め付けることができる。
図11に示すように、締結用ボルト560を工具800を用いて締結する。このときも、ロータ軸113が回転して締め付けができなくなることを防止するため、カバー部500を工具600で固定する。
こうして、カバー部500と回転翼102およびロータ軸113とを容易にかつ確実に締結することができる。
101 吸気口
102 回転翼
102d 円筒部
103 回転体
113 ロータ軸
123 固定翼
125 固定翼スペーサ
127 外筒
129 ベース部
131 ネジ付スペーサ
131a ネジ溝
133 排気口
200 制御装置
210 ロータ軸頂部
220 貫通孔
300 ワッシャ
310 アーマチャディスク
320 ナット
500 カバー部
510 キャップ部
520 座金部
530 ボルト用貫通孔
540 バランス錘用ネジ穴
550 嵌合部
560 締結用ボルト
570 バランス錘用ネジ
600、700、800 工具
Claims (8)
- 回転可能に支持された回転軸と、前記回転軸の頂部を貫通させる貫通孔を有し、該貫通孔を前記頂部に貫通させて固定される回転翼と、を備えた回転体と、
前記回転軸の頂部と前記貫通孔を覆うように、前記回転体に固定されるカバー部とを備えた真空ポンプであって、
前記カバー部は、前記回転体のアンバランスを修正するためのバランス修正機能を備え、かつ、排気ガスに対する耐腐食性を有することを特徴とする真空ポンプ。
- 前記カバー部の排気ガスに対する耐腐食性は、耐腐食性の表面処理を施してあることにより達成することを特徴とする請求項1に記載の真空ポンプ。
- 前記カバー部は、前記回転体を固定または支持するための工具と嵌合する部分を備えることを特徴とする請求項1または請求項2に記載の真空ポンプ。
- 前記バランス修正機能は、前記カバー部に設けられた凹部に配置されたバランス修正錘により行われ、該バランス修正錘は排気ガスに対する耐腐食性を有することを特徴とする請求項1、請求項2または請求項3に記載の真空ポンプ。
- 前記バランス修正錘は、排気ガスに対する耐腐食性の表面処理を施してあることを特徴とする請求項4に記載の真空ポンプ。
- 回転可能に支持された回転軸と、前記回転軸の頂部を貫通させる貫通孔を有し、該貫通孔を前記頂部に貫通させて固定される回転翼と、を備えた回転体であって、
前記回転軸の頂部と前記貫通孔を覆うように、前記回転体に固定されるカバー部をさらに備え、
前記カバー部は、前記回転体のアンバランスを修正するためのバランス修正機能を備え、かつ、排気ガスに対する耐腐食性を有することを特徴とする回転体。
- 回転可能に支持された回転軸と、前記回転軸の頂部を貫通させる貫通孔を有し、該貫通孔を前記頂部に貫通させて固定される回転翼と、を備えた回転体の前記回転軸の頂部と前記貫通孔を覆うように、前記回転体に固定されるカバー部であって、
前記回転体のアンバランスを修正するためのバランス修正機能を備え、かつ、排気ガスに対する耐腐食性を有することを特徴とするカバー部。
- 回転可能に支持された回転軸と、前記回転軸の頂部を貫通させる貫通孔を有し、該貫通孔を前記頂部に貫通させて固定される回転翼と、を備えた回転体の製造方法であって、
排気ガスに対する耐腐食性を有するカバー部を前記回転軸の頂部と前記貫通孔を覆うように、前記回転体に固定し、前記カバー部を固定した状態で前記回転体のアンバランスを修正することを特徴とする回転体の製造方法。
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CN202280008694.6A CN116670398A (zh) | 2021-01-20 | 2022-01-11 | 真空泵、旋转体、罩部及旋转体的制造方法 |
EP22742458.7A EP4283131A1 (en) | 2021-01-20 | 2022-01-11 | Vacuum pump, rotational solid, cover section, and method for manufacturing rotational solid |
IL303945A IL303945A (en) | 2021-01-20 | 2022-01-11 | Vacuum pump, rotating body, cover part and method of manufacturing rotating body |
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JP2003148389A (ja) | 2001-11-16 | 2003-05-21 | Boc Edwards Technologies Ltd | 真空ポンプ |
JP2007239464A (ja) * | 2006-03-03 | 2007-09-20 | Boc Edwards Kk | ロータ軸と回転体との固定構造及び該固定構造を有するターボ分子ポンプ |
US20140271174A1 (en) * | 2013-03-14 | 2014-09-18 | Roger L. Bottomfield | Turbine Cap for Turbo-Molecular Pump |
WO2017138154A1 (ja) * | 2016-02-12 | 2017-08-17 | エドワーズ株式会社 | 真空ポンプ及び該真空ポンプに用いられる可撓性カバー及びロータ |
JP2018035684A (ja) * | 2016-08-29 | 2018-03-08 | 株式会社島津製作所 | 真空ポンプ |
-
2021
- 2021-01-20 JP JP2021007344A patent/JP2022111724A/ja active Pending
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2022
- 2022-01-11 WO PCT/JP2022/000595 patent/WO2022158336A1/ja active Application Filing
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- 2022-01-11 EP EP22742458.7A patent/EP4283131A1/en active Pending
- 2022-01-11 CN CN202280008694.6A patent/CN116670398A/zh active Pending
- 2022-01-11 KR KR1020237021499A patent/KR20230131832A/ko unknown
Patent Citations (5)
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JP2003148389A (ja) | 2001-11-16 | 2003-05-21 | Boc Edwards Technologies Ltd | 真空ポンプ |
JP2007239464A (ja) * | 2006-03-03 | 2007-09-20 | Boc Edwards Kk | ロータ軸と回転体との固定構造及び該固定構造を有するターボ分子ポンプ |
US20140271174A1 (en) * | 2013-03-14 | 2014-09-18 | Roger L. Bottomfield | Turbine Cap for Turbo-Molecular Pump |
WO2017138154A1 (ja) * | 2016-02-12 | 2017-08-17 | エドワーズ株式会社 | 真空ポンプ及び該真空ポンプに用いられる可撓性カバー及びロータ |
JP2018035684A (ja) * | 2016-08-29 | 2018-03-08 | 株式会社島津製作所 | 真空ポンプ |
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IL303945A (en) | 2023-08-01 |
JP2022111724A (ja) | 2022-08-01 |
KR20230131832A (ko) | 2023-09-14 |
EP4283131A1 (en) | 2023-11-29 |
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