WO2018221345A1 - 真空ポンプとその加熱装置 - Google Patents
真空ポンプとその加熱装置 Download PDFInfo
- Publication number
- WO2018221345A1 WO2018221345A1 PCT/JP2018/019824 JP2018019824W WO2018221345A1 WO 2018221345 A1 WO2018221345 A1 WO 2018221345A1 JP 2018019824 W JP2018019824 W JP 2018019824W WO 2018221345 A1 WO2018221345 A1 WO 2018221345A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- vacuum pump
- resistance heating
- pump
- exhaust
- heating elements
- Prior art date
Links
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/023—Industrial applications
- H05B1/0244—Heating of fluids
-
- 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
- F04D19/044—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
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/006—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by influencing fluid temperatures
-
- 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
-
- 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
- F04D29/584—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps cooling or heating the machine
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
- G01R31/2836—Fault-finding or characterising
-
- 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
- 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
- F05D2210/00—Working fluids
- F05D2210/10—Kind or type
- F05D2210/12—Kind or type gaseous, i.e. compressible
-
- 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
- F05D2260/60—Fluid transfer
- F05D2260/607—Preventing clogging or obstruction of flow paths by dirt, dust, or foreign particles
-
- 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
- F05D2260/80—Diagnostics
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K49/00—Means in or on valves for heating or cooling
- F16K49/002—Electric heating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
- F16L53/30—Heating of pipes or pipe systems
- F16L53/35—Ohmic-resistance heating
- F16L53/37—Ohmic-resistance heating the heating current flowing directly through the pipe to be heated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
- F16L53/30—Heating of pipes or pipe systems
- F16L53/35—Ohmic-resistance heating
- F16L53/38—Ohmic-resistance heating using elongate electric heating elements, e.g. wires or ribbons
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/022—Heaters specially adapted for heating gaseous material
Definitions
- the present invention relates to a vacuum pump used as a gas exhaust means for a process chamber in a semiconductor manufacturing apparatus, a flat panel display manufacturing apparatus, a solar panel manufacturing apparatus, and other vacuum chambers, and a heating apparatus for the vacuum pump. This is suitable for prolonging the life of the heating means used as a product accumulation prevention measure.
- a vacuum pump described in Patent Document 1 includes a rotating body composed of a rotor (4) and a rotating blade (6), and the interaction with a fixed member due to the rotation of the rotating body, specifically, the rotating blade (6 ) And the stationary blade (7) and the interaction between the outer peripheral surface of the rotor (4) and the thread groove stator (8), gas molecules are transferred from the intake port to the exhaust port (2), The process gas used in the semiconductor manufacturing apparatus is exhausted.
- the sublimable gas contained in the process gas becomes a gas or a solid in relation to the temperature and its partial pressure, and is easily solidified in a low temperature environment or a high partial pressure environment.
- a part of the entire exhaust flow path for exhausting gas in particular, an environment where the sublimable gas is easily solidified, specifically, the outer peripheral surface of the rotor (4) and the screw
- the vicinity of the outlet of the exhaust passage (R2) formed by the groove stator (8) is intensively heated by a plurality of resistance heating elements (13).
- the sublimation gas is likely to be solidified near the outlet of the exhaust passage (R2), and the exhaust efficiency is increased by the accumulation of the solidified product (sublimation gas). It becomes difficult to maintain the exhaust performance of the vacuum pump, such as lowering. For this reason, there is a possibility that the operation of a target device to be evacuated by a vacuum pump, for example, a process device in a semiconductor manufacturing device, must be stopped immediately.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vacuum pump suitable for prolonging the life of a heating means used as a product deposition preventing measure in a vacuum pump, and a heating apparatus therefor. Is to provide.
- the present invention provides a vacuum pump that exhausts gas by rotation of a rotating body, and includes an exhaust passage for exhausting the gas and a heating unit that heats the exhaust passage.
- the heating means is configured by connecting a plurality of resistance heating elements in parallel to a pair of wiring lines.
- current measuring means for measuring the sum of the current values flowing through the plurality of resistance heating elements, and determination means for determining a failure condition of the plurality of resistance heating elements based on the measurement values obtained by the current measurement means; , May be provided.
- output means for outputting the failure status determined by the determination means may be provided.
- the failure condition may be the number of failures among the plurality of resistance heating elements.
- the pair of wiring lines and the plurality of resistance heating elements may be connected by a connector.
- both ends of at least one of the pair of wiring lines may be connected by a connecting means.
- the present invention is a heating device for a vacuum pump, characterized in that the heating means constituting the vacuum pump is provided.
- the heating means has a configuration in which a plurality of resistance heating elements are connected in parallel to a pair of wiring lines. Adopted. For this reason, even if, for example, any one of the plurality of resistance heating elements breaks down, the other resistance heating elements can operate normally. Suitable for prolonging the life of heating means used as a measure for preventing product accumulation in vacuum pumps in that heating can be continued and product accumulation in the exhaust flow path can be prevented by continuous heating.
- the present invention even if any one of the resistance heating elements fails, for example, the heating of the exhaust passage can be continued, and product accumulation in the exhaust passage can be prevented.
- the operation of the target apparatus for vacuuming by the vacuum pump of the present invention for example, the process apparatus in the semiconductor manufacturing apparatus can be continued.
- FIG. 3 is a component arrangement diagram of the electric circuit configuration shown in FIG. 2.
- FIG. 3 is a component arrangement diagram of the electric circuit configuration shown in FIG. 2.
- the flowchart figure which showed the operation control action of the vacuum pump by a pump control means.
- Explanatory drawing of the electric circuit structure of the heating means employ
- FIG. 1 is a cross-sectional view of a vacuum pump to which the present invention is applied
- FIG. 2 is a block diagram including an electric circuit configuration of a heating means of the present invention
- FIGS. 3 and 4 are electric circuit configurations shown in FIG. FIG.
- a vacuum pump P1 in FIG. 1 includes an outer casing 1 having a cylindrical cross section, a rotating body RB disposed in the outer case 1, a supporting means for rotatably supporting the rotating body RB, Drive means for rotationally driving the body RB is provided.
- the outer case 1 has a bottomed cylindrical shape in which a cylindrical pump case 1A and a bottomed cylindrical pump base 1B are integrally connected with a fastening bolt in the cylinder axis direction, and the upper end side of the pump case 1A Is opened as an intake port 2 for inhaling gas, and an exhaust port 3 for exhausting gas out of the outer case 1 is provided on the side surface of the lower end of the pump base 1B.
- the intake port 2 is connected to a vacuum chamber (not shown) that is in a high vacuum, such as a process chamber constituting a process apparatus of a semiconductor manufacturing apparatus, via a pressure adjustment valve (not shown).
- the exhaust port 3 is connected in communication with an auxiliary pump (not shown).
- a cylindrical stator column 4 containing various electrical components is provided in the center of the pump case 1A.
- the stator column 4 is formed as a separate component from the pump base 1B and fixed to the inner bottom of the pump base 1B by screws, so that the stator column 4 is erected on the pump base 1B.
- the stator column 4 may be erected integrally with the inner bottom of the pump base 1B.
- a pair of wiring lines WL1 and WL2 (see FIG. 2) and a plurality of resistance heating elements RE (see FIG. 2) are provided as components constituting the heating means HM (see FIG. 2). Yes.
- the detailed configuration of the heating means HM will be described later.
- the installation place of the components which comprise the heating means HM is not limited to the pump base 1B, It can change suitably as needed.
- a rotor 6 constituting a rotating body RB is provided outside the stator column 4.
- the rotor 6 is enclosed in the pump case 1 ⁇ / b> A and the pump base 1 ⁇ / b> B and has a cylindrical shape surrounding the outer periphery of the stator column 4.
- a rotor shaft 5 is provided inside the stator column 4 as a rotation center axis of the rotating body RB.
- the rotor shaft 5 is arranged such that its upper end portion faces the intake port 2 and its lower end portion faces the pump base 1B.
- the rotor shaft 5 is rotatably supported by magnetic bearings (specifically, two known radial magnetic bearings MB1 and one set of axial magnetic bearings MB2).
- a drive motor MO is provided inside the stator column 4, and the rotor shaft 5 is rotationally driven around the axis by the drive motor MO.
- the upper end portion of the rotor shaft 5 protrudes upward from the cylindrical upper end surface of the stator column 4, and the upper end side of the rotor 6 is integrally fixed to the protruding upper end portion of the rotor shaft 5 by fastening means such as bolts. Therefore, the rotor 6 is rotatably supported by the magnetic bearings (radial magnetic bearing MB1, axial magnetic bearing MB2) via the rotor shaft 5, and when the drive motor MO is started in this supported state, the rotor 6 can rotate around the rotor axis integrally with the rotor shaft 5.
- the magnetic bearings radial magnetic bearing MB1, axial magnetic bearing MB2
- the magnetic bearing functions as a support unit that rotatably supports the rotor shaft 5 and the rotor 6, and the drive motor MO functions as a drive unit that rotationally drives the rotor 6.
- the vacuum pump P1 in FIG. 1 includes a plurality of exhaust stages PT that function as means for exhausting gas molecules between the intake port 2 and the exhaust port 3.
- a screw is not provided between the downstream portion of the plurality of exhaust stages PT, specifically between the lowest exhaust stage PT (PTn) of the plurality of exhaust stages PT to the exhaust port 3.
- a groove pump stage PS is provided.
- the vacuum pump P ⁇ b> 1 in FIG. 1 functions as a plurality of exhaust stages PT upstream from substantially the middle of the rotor 6.
- the plurality of exhaust stages PT will be described in detail.
- a plurality of rotating blades 7 that rotate integrally with the rotor 6 are provided on the outer peripheral surface of the rotor 6 that is substantially upstream from the middle of the rotor 6, and these rotating blades 7 are arranged in the exhaust stage PT (PT 1, PT 2,. ) Are arranged radially at predetermined intervals around the rotation center axis of the rotor 6 (specifically, the axis of the rotor shaft 5) or the axis of the outer case 1 (hereinafter referred to as “vacuum pump axis”). Yes.
- a plurality of fixed blades 8 are provided on the inner peripheral side of the pump case 1A. These fixed blades 8 are also provided for each exhaust stage PT (PT1, PT2,.
- the vacuum pump shafts are arranged radially at predetermined intervals around the axis.
- each exhaust stage PT (PT1, PT2,... PTn) in the vacuum pump P1 of FIG. 1 is provided in multiple stages between the intake port 2 and the exhaust port 3, and the exhaust stage PT (PT1, PT2,... PTn).
- Each has a plurality of rotating blades 7 and fixed blades 8 arranged radially at predetermined intervals, and has a structure for exhausting gas molecules by these.
- Each of the rotating blades 7 is a blade-like cut product that is cut and formed integrally with the outer diameter machining portion of the rotor 6 and is inclined at an angle that is optimal for exhausting gas molecules.
- Each fixed blade 8 is also inclined at an angle optimum for exhausting gas molecules.
- the rotating blade 7 rotates in the same manner as the uppermost exhaust stage PT (PT1), and the above-described rotating blade 7 applies gas molecules to the gas molecules.
- the gas molecules near the intake port 2 are exhausted so as to sequentially move downstream of the rotor 6.
- the vacuum pump P1 of FIG. 1 is configured so that the downstream of the middle of the rotor 6 functions as a thread groove pump stage PS.
- the thread groove pump stage PS will be described in detail.
- the thread groove pump stage PS is a thread groove as a means for forming a thread groove-shaped exhaust flow path R on the outer peripheral side of the rotor 6 (specifically, the outer peripheral side of the rotor 6 portion downstream from the substantially middle of the rotor 6).
- the threaded groove stator 9 is attached to the inner peripheral side of the outer case 1 as a fixing member.
- the thread groove stator 9 is a cylindrical fixing member arranged so that the inner peripheral surface thereof faces the outer peripheral surface of the rotor 6, and is arranged so as to surround a portion of the rotor 6 downstream from the substantially middle of the rotor 6. It is.
- the portion of the rotor 6 downstream from the substantially middle of the rotor 6 is a portion that rotates as a rotating member of the thread groove pump stage PS, and is inserted and accommodated inside the thread groove stator 9 via a predetermined gap. Yes.
- a thread groove 91 is formed in the inner peripheral portion of the thread groove stator 9 to change into a tapered cone shape whose depth is reduced in diameter downward.
- the thread groove 91 is spirally engraved from the upper end to the lower end of the thread groove stator 9.
- An exhaust passage R for exhausting gas is formed on the outer peripheral side of the rotor 6 by the thread groove stator 9 provided with the thread groove 91 as described above.
- illustration is abbreviate
- the inlet (upstream opening end) of the exhaust flow path R opens toward the gap (hereinafter referred to as “final gap GE”) between the fixed blade 8n and the thread groove stator 9 constituting the lowermost exhaust stage PTn, Further, the outlet (downstream opening end) of the groove exhaust flow path R communicates with the exhaust port 3 through the in-pump exhaust port side flow path PR.
- the pump exhaust side flow path PR has a predetermined gap between the lower end of the rotor 6 and the thread groove stator 9 and the inner bottom of the pump base 1B (in the vacuum pump P1 of FIG. By providing a gap in the form of one round, the exhaust passage R is formed so as to reach the exhaust port 3.
- the heating means HM has an electric circuit configuration in which a plurality (specifically six) resistance heating elements RE are connected in parallel to a pair of wiring lines WL1 and WL2. . Further, in this electric circuit configuration, a thermostat is incorporated as the overheat preventing means 104, but the assembling position can be changed as necessary.
- the pair of wiring lines WL1 and WL2 are arranged so as to surround the outer periphery of the rotating body RB inside the pump base 1B.
- One wiring line WL1 is connected to a power supply (ACC) (not shown), and the other wiring line WL2 is connected to the ground (GND).
- ACC power supply
- GND ground
- the plurality of resistance heating elements RE are arranged radially at equal intervals around the rotating body RB inside the pump base 1B, and generate heat when energized, thereby exhausting the screw groove pump stage PS via the pump base 1B.
- the vicinity of the outlet of the flow path R can be heated intensively.
- the pressure is high near the outlet of the exhaust passage R, the product is most likely to accumulate, and the pump base 1B is located near the outlet of the exhaust passage R.
- a plurality of resistance heating elements RE are installed inside 1B, the present invention is not limited to such an installation example.
- a plurality of resistance heating elements RE may be installed inside the thread groove stator 9, or a plurality of resistance heating elements RE may be installed on a vacuum pump fixing member other than the pump base 1B and the thread groove stator 9. .
- the number of resistance heating elements RE is not limited to six, and the number can be increased or decreased as needed.
- a pair of wiring lines WL1, WL2 and a plurality of resistance heating elements RE are connected by a connector CT (hereinafter referred to as “connector connection”) so that each can be attached and detached.
- the connector connection described above is excellent in maintainability of the heating means HM in that only the defective resistance heating element RE can be removed from the pair of wiring lines WL1 and WL2 by releasing the connection of the connector CT. .
- both ends of the pair of wiring lines WL1 and WL2 are not connected to each other.
- at least one of the pair of wiring lines WL1 and WL2 is used. Both ends of the wiring line (WL1 or WL2) may be connected by the connecting means CP as in the example shown in FIG.
- connection means CP may be in a state where both ends of the wiring line WL1 (or WL2) are electrically connected by adopting, for example, a known connector used for connecting the electrical wiring.
- a connecting component other than the connector for example, a hook and a ring engageable with the hook as the connecting means CP, both ends of the wiring line WL1 (or WL2) may not be electrically connected.
- the ends of the wiring lines WL1 and WL2 are fixed by the connecting means CP. Therefore, the wiring line WL1 surrounds the outer periphery of the rotating body RB inside the pump base 1B.
- the wiring arrangement when WL2 is arranged becomes clear, and there is an advantage that the wiring arrangement workability is improved.
- the heating means HM is composed of a plurality of resistance heating elements RE, and measures a total sum of flowing current values, and a plurality of resistance heating elements based on the measurement values of the current measurement means 101.
- Discriminating means 102 (hereinafter referred to as “failure condition discriminating means 102”) for determining the failure condition of the RE and output means 103 (hereinafter referred to as “failure condition output means 103”) for outputting the fault condition discriminated by the fault condition discriminating means 102. And may be provided.
- a known current measuring device can be used as the current measuring means 101.
- current measuring means current measuring device
- the current measuring unit 101 may be installed on the wiring line WL1.
- normal operation of the vacuum pump P1 the operation of the vacuum pump P1 in a state where all of the plurality of resistance heating elements RE are operating normally (state without failure) is referred to as “normal operation of the vacuum pump P1”.
- the current value Ip measured by the current measuring means during the normal operation of P1 is referred to as “normal total current value Ip”.
- the failure condition determination unit 102 determines “the number of failures of the resistance heating element RE” as an example of the failure condition.
- the process for obtaining the number of failures of the resistance heating element RE will be described in “Process for obtaining current reduction rate X and number of failures S” described later.
- the failure condition output means 103 outputs the failure condition (number of failures of the resistance heating element RE) determined by the failure condition determination means 102 to, for example, the control means CM of the vacuum pump P1.
- Control means of vacuum pump P1 The control means CM (hereinafter referred to as “pump control means CM”) of the vacuum pump P1 controls the operation of the vacuum pump P1 in an integrated manner.
- Various drive circuits DR for driving pump electrical components such as a CPU, a CPU for outputting operation start and stop commands to the various drive circuits DR, and a data storage unit ME including a ROM, a RAM, a hard disk, etc. Prepare.
- the pump control means CM determines whether or not maintenance of the resistance heating element RE is necessary based on the degree of failure (number of failures of the resistance heating element RE) output from the failure condition output means 103. In addition to performing the determination process, the operation of the vacuum pump P1 is controlled such that the operation of the vacuum pump P1 is immediately stopped when it is determined that the resistance heating element RE needs to be maintained. In order to perform this control, the normal total current value Ip described above is stored and recorded in advance in the data storage unit ME of the pump control means CM.
- the normal total current value Ip may be recorded before shipment, or the normal total actual current value of the heating means HM immediately after the start of operation of the vacuum pump P1 is recorded as the normal total current value Ip. You may do it.
- FIG. 5 is a flowchart showing the operation control operation of the vacuum pump by the pump control means CM.
- the series of operation control operations shown in the flowchart of FIG. 5 is started, for example, triggered by the operation start of the vacuum pump P1, and first, the normal current value Ip is read from the data storage unit ME of the pump control means CM. (ST1) Next, after the total of current values actually flowing through the plurality of resistance heating elements RE (hereinafter referred to as “actual total current value Ip ′”) is measured by the current detection means 101 (ST2), The total current value Ip and the actual total current value Ip ′ are compared (ST3).
- the process returns to the process of ST2 (No in ST5), while it is determined that the maintenance of the vacuum pump P1 is necessary. If so, the operation of the vacuum pump P1 is stopped (ST6).
- the state of the resistance heating element RE of the heating means HM (the number of failures of the resistance heating element RE) is determined. Processing (hereinafter referred to as “heater state determination processing”) is performed (ST7).
- a determination process for determining whether or not the resistance heating element RE needs to be maintained based on the state of the resistance heating element RE determined in ST7 (the number of failures of the resistance heating element RE) (hereinafter referred to as “heater maintenance determination process”). (ST8).
- the failure number S of the resistance heating element RE satisfies the conditions of the above formulas (3) and (4), that is, the conditions of the following formula (5). N ⁇ X ⁇ S ⁇ N ⁇ X + 1 (5)
- the equation (5) becomes the following equation (6). From the following equation (6), it can be determined that the number of failures S (integer) of the resistance heating element RE is two. 1.8 ⁇ S ⁇ 2.8 Formula (6)
- Stopping of vacuum pump P1 at ST6 operates, for example, on various drive circuits for driving pump electrical components such as the radial magnetic bearing MB1, the axial magnetic bearing MB2, and the drive motor MO from the CPU of the pump control means CM. Processing necessary for stopping the operation of the vacuum pump P1, such as outputting a stop command, is performed by the pump control means CM (ST6).
- the heating unit HM has an electric circuit configuration in which a plurality of resistance heating elements RE are connected in parallel to the pair of wiring lines WL1 and WL2.
- the configuration is adopted. For this reason, even if, for example, any one of the plurality of resistance heating elements RE breaks down, the other resistance heating elements can operate normally.
- the heating of the heating means HM used as a product accumulation preventing measure in the vacuum pump P1 is possible in that the heating of the path R can be continued and the accumulation of the products in the exhaust flow path R can be prevented by the continuous heating. It is suitable for achieving.
- the vacuum pump P1 of the present embodiment even if any one of the resistance heating elements fails, for example, the heating of the exhaust flow path R can be continued, and the exhaust flow path R In addition, it is possible to prevent the deposition of the product in the inside, and there is also an advantage that the operation of the apparatus to be evacuated by the vacuum pump P1, for example, the process apparatus in the semiconductor manufacturing apparatus can be continued.
- the heating means HM constituting the vacuum pump P1 of the present embodiment described above may be configured as a heating device separate from the vacuum pump P1.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Non-Positive Displacement Air Blowers (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
Description
図1の真空ポンプP1は、ロータ6の略中間より上流が複数の排気段PTとして機能する。以下、複数の排気段PTを詳細に説明する。
以上の構成からなる複数の排気段PTにおいて、最上段の排気段PT(PT1)では駆動モータMOの起動により、ロータ軸5およびロータ6と一体に複数の回転ブレード7が高速で回転し、回転ブレード7の回転方向前面かつ下向き(吸気口2から排気口3に向かう方向、以降下向きと略する)の傾斜面により吸気口2から入射したガス分子に下向きかつ接線方向の運動量を付与する。この下向きの運動量を有するガス分子が固定ブレード8に設けられた、回転ブレード7と回転方向に逆向きの下向きの傾斜面によって次の排気段PT(PT2)へ送り込まれる。また、次の排気段PT(PT2)およびそれ以降の排気段PTでも、最上段の排気段PT(PT1)と同じく、回転ブレード7が回転し、前記のような回転ブレード7によるガス分子への運動量の付与と固定ブレード8によるガス分子の送り込み動作とが行われることで、吸気口2付近のガス分子は、ロータ6の下流に向かって順次移行するように排気される。
図1の真空ポンプP1では、ロータ6の略中間より下流がネジ溝ポンプ段PSとして機能するように構成してある。以下、ネジ溝ポンプ段PSを詳細に説明する。
先に説明した複数の排気段PTの排気動作による移送によって前述の最終隙間GEに到達したガス分子は、ネジ溝ポンプ段PSの排気流路Rに移行する。移行したガス分子は、ロータ6の回転によって生じるドラッグ効果によって、遷移流から粘性流に圧縮されながらポンプ内排気口側流路PRに向かって移行する。そして、ポンプ内排気口側流路PRに到達したガス分子は排気口3に流入し、図示しない補助ポンプを通じて外装ケース1の外へ排気される。
図2および図3を参照すると、加熱手段HMは、一対の配線ラインWL1、WL2に対して複数(具体的には6個)の抵抗発熱体REを並列に接続した電気回路構成になっている。また、この電気回路構成中には、過熱防止手段104として、サーモスタットを組み込んでいるが、その組み込み位置は、必要に応じて適宜変更することができる。
真空ポンプP1の制御手段CM(以下「ポンプ制御手段CM」という)は、真空ポンプP1の運転を統括制御するものであって、先に説明したラジアル磁気軸受MB1、アキシャル磁気軸受MB2、駆動モータMOなどのポンプ電装部品を駆動するための各種駆動回路DRや、その各種駆動回路DRに対して動作開始や動作停止の指令を出力するCPU、およびROM、RAM、ハードディスクなどからなるデータ記憶部MEを備える。
図5は、ポンプ制御手段CMによる真空ポンプの運転制御動作を示したフローチャート図である。
ST7におけるヒータ状態判定処理では、電流減少率Xを算出し(ST71)、算出した電流減少率Xに基づいて抵抗発熱体REの故障数S(整数)を求める(ST72)。この電流減少率Xを算出する処理や、抵抗発熱体REの故障数Sを求める処理は、下記《電流減少率X、故障数Sを求める処理》に記載した通りである。
電流減少率をXとすると、電流減少率Xは、下記式(1)で求めることができる。
X =(Ip-Ip′)/Ip …式(1)
また、抵抗発熱体REの故障数をS(整数)、抵抗発熱体REの全数をNとすると、電流減少率Xに基づき故障数S(整数)を求める式は、下記式(2)で示される。
N・X ≦ S …式(3)
前記式(2)の左辺を変形すると、下記式(4)のようになる。
S < N・X+1 …式(4)
N・X ≦ S < N・X+1 …式(5)
1.8 ≦ S < 2.8 …式(6)
ST8におけるヒータメンテナンス判定処理では、抵抗発熱体REの故障率(=抵抗発熱体の故障数S/抵抗発熱体の全数N)を算出し、算出した故障率が予め設定された基準の故障率(以下「基準故障率」という)より大きい場合は“ヒータメンテナンスは必要である”と判定し、それ以外は“ヒータメンテナンスは不要である”と判定する(ST8)。
但し S:抵抗発熱体の故障数
N:抵抗発熱体の全数
前記ST6での真空ポンプP1の停止は、例えば、ポンプ制御手段CMのCPUからラジアル磁気軸受MB1、アキシャル磁気軸受MB2、駆動モータMOなどのポンプ電装部品を駆動するための各種駆動回路に対して動作停止指令を出力するなど、真空ポンプP1の運転停止に必要な処理をポンプ制御手段CMで行なう(ST6)。
1A ポンプケース
1B ポンプベース
2 吸気口
3 排気口
4 ステータコラム
5 ロータ軸
6 ロータ
7 回転ブレード
8 固定ブレード
9 ネジ溝ステータ
91 ネジ溝
101 電流測定手段
102 判別手段(故障具合判別手段)
103 出力手段(故障具合出力手段)
104 過熱防止手段
CM 制御手段(ポンプ制御手段)
CP 連結手段
CT コネクタ
DR 各種駆動回路
GE 最終隙間
HM 加熱手段
MB1 ラジアル磁気軸受
MB2 アキシャル磁気軸受
ME データ記憶部
MO 駆動モータ
P1 真空ポンプ
PS ネジ溝ポンプ段
RB 回転体
PT 排気段
PT1 最上段の排気段
PTn 最下段の排気段
PR ポンプ内排気口側流路
R 排気流路
RE 抵抗発熱体
WL1、WL2 配線ライン
Claims (7)
- 回転体の回転によりガスを排気する真空ポンプにおいて、
前記ガスを排気するための排気流路と、
前記排気流路を加熱する加熱手段と、を有し、
前記加熱手段は、一対の配線ラインに対して複数の抵抗発熱体を並列に接続して構成されていること
を特徴とする真空ポンプ。 - 前記複数の抵抗発熱体に流れる電流値の総和を測定する電流測定手段と、
前記電流測定手段での測定値に基づき前記複数の抵抗発熱体の故障具合を判別する判別手段と、を備えたこと
を特徴とする請求項1に記載の真空ポンプ。 - 前記判別手段で判別した前記故障具合を出力する出力手段を備えたこと
を特徴とする請求項2に記載の真空ポンプ。 - 前記故障具合は、前記複数の抵抗発熱体のうち故障した数であること
を特徴とする請求項2または3に記載の真空ポンプ。 - 前記一対の配線ラインと前記複数の抵抗発熱体とがコネクタによって連結されていること
を特徴とする請求項1ないし4のいずれか1項に記載の真空ポンプ。 - 前記一対の配線ラインのうち少なくともいずれか一方の配線ラインの両端部が連結手段によって連結されていること
を特徴とする請求項1ないし5のいずれか1項に記載の真空ポンプ。 - 請求項1ないし6のいずれか1項に記載の真空ポンプを構成する前記加熱手段を備えたことを特徴とする真空ポンプの加熱装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16/616,293 US11889595B2 (en) | 2017-05-30 | 2018-05-23 | Vacuum pump and heating device therefor |
EP18810257.8A EP3633203A4 (en) | 2017-05-30 | 2018-05-23 | VACUUM PUMP AND HEATING DEVICE FOR IT |
KR1020197033435A KR102589087B1 (ko) | 2017-05-30 | 2018-05-23 | 진공 펌프와 그 가열 장치 |
CN201880034241.4A CN110621885A (zh) | 2017-05-30 | 2018-05-23 | 真空泵和其加热装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017106108A JP6943629B2 (ja) | 2017-05-30 | 2017-05-30 | 真空ポンプとその加熱装置 |
JP2017-106108 | 2017-05-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2018221345A1 true WO2018221345A1 (ja) | 2018-12-06 |
Family
ID=64454692
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2018/019824 WO2018221345A1 (ja) | 2017-05-30 | 2018-05-23 | 真空ポンプとその加熱装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US11889595B2 (ja) |
EP (1) | EP3633203A4 (ja) |
JP (1) | JP6943629B2 (ja) |
KR (1) | KR102589087B1 (ja) |
CN (1) | CN110621885A (ja) |
WO (1) | WO2018221345A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7371852B2 (ja) * | 2019-07-17 | 2023-10-31 | エドワーズ株式会社 | 真空ポンプ |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5438611Y2 (ja) * | 1974-12-11 | 1979-11-16 | ||
JPS6345755Y2 (ja) * | 1980-01-18 | 1988-11-28 | ||
JPH04201358A (ja) * | 1990-11-30 | 1992-07-22 | Toshiba Corp | サーマルヘッドの断線検知装置 |
JPH08310030A (ja) * | 1995-05-16 | 1996-11-26 | Ishida Co Ltd | サーマルヘッドの断線検出装置 |
JP2015031153A (ja) | 2013-07-31 | 2015-02-16 | エドワーズ株式会社 | 真空ポンプ |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1936391A (en) * | 1930-02-19 | 1933-11-21 | Harrower Archibald Fr Thompson | Thawing appliance |
JPS5438611A (en) | 1977-09-02 | 1979-03-23 | Komatsu Mfg Co Ltd | Device of laying underground buried pipe |
US4372279A (en) * | 1980-11-24 | 1983-02-08 | Paccar Inc. | Heated fuel line |
JPS6345755A (ja) | 1986-08-13 | 1988-02-26 | Toshiba Battery Co Ltd | 積層乾電池 |
JPS6419198A (en) * | 1987-07-15 | 1989-01-23 | Hitachi Ltd | Vacuum pump |
US4926648A (en) * | 1988-03-07 | 1990-05-22 | Toshiba Corp. | Turbomolecular pump and method of operating the same |
JP2998903B2 (ja) * | 1990-11-14 | 2000-01-17 | 東京エレクトロン株式会社 | 熱処理装置 |
US6902378B2 (en) * | 1993-07-16 | 2005-06-07 | Helix Technology Corporation | Electronically controlled vacuum pump |
JP3204866B2 (ja) | 1994-08-31 | 2001-09-04 | 東京エレクトロン株式会社 | 真空処理装置及び真空処理方法 |
JP2002155891A (ja) * | 2000-11-22 | 2002-05-31 | Seiko Instruments Inc | 真空ポンプ |
JP4821308B2 (ja) * | 2005-12-21 | 2011-11-24 | 株式会社島津製作所 | 真空ポンプ |
JP4958440B2 (ja) | 2006-01-12 | 2012-06-20 | パナソニック株式会社 | 高周波加熱装置 |
FR2919456B1 (fr) | 2007-07-26 | 2009-11-27 | Inergy Automotive Systems Res | Methode pour le chauffage d'au moins un composant d'un systeme scr a l'aide d'elements chauffants resistifs. |
GB0801936D0 (en) | 2008-02-01 | 2008-03-12 | Isis Innovation | Electricity generator |
KR101345228B1 (ko) * | 2012-04-12 | 2013-12-27 | 주식회사 청석 | 히터 일체형 펌프 |
JP6147988B2 (ja) | 2012-11-08 | 2017-06-14 | エドワーズ株式会社 | 真空ポンプ |
US10584709B2 (en) * | 2015-03-27 | 2020-03-10 | Dresser-Rand Company | Electrically heated balance piston seal |
-
2017
- 2017-05-30 JP JP2017106108A patent/JP6943629B2/ja active Active
-
2018
- 2018-05-23 US US16/616,293 patent/US11889595B2/en active Active
- 2018-05-23 KR KR1020197033435A patent/KR102589087B1/ko active IP Right Grant
- 2018-05-23 WO PCT/JP2018/019824 patent/WO2018221345A1/ja active Application Filing
- 2018-05-23 EP EP18810257.8A patent/EP3633203A4/en active Pending
- 2018-05-23 CN CN201880034241.4A patent/CN110621885A/zh active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5438611Y2 (ja) * | 1974-12-11 | 1979-11-16 | ||
JPS6345755Y2 (ja) * | 1980-01-18 | 1988-11-28 | ||
JPH04201358A (ja) * | 1990-11-30 | 1992-07-22 | Toshiba Corp | サーマルヘッドの断線検知装置 |
JPH08310030A (ja) * | 1995-05-16 | 1996-11-26 | Ishida Co Ltd | サーマルヘッドの断線検出装置 |
JP2015031153A (ja) | 2013-07-31 | 2015-02-16 | エドワーズ株式会社 | 真空ポンプ |
Also Published As
Publication number | Publication date |
---|---|
EP3633203A1 (en) | 2020-04-08 |
JP2018200041A (ja) | 2018-12-20 |
US11889595B2 (en) | 2024-01-30 |
EP3633203A4 (en) | 2021-02-24 |
JP6943629B2 (ja) | 2021-10-06 |
CN110621885A (zh) | 2019-12-27 |
KR102589087B1 (ko) | 2023-10-13 |
KR20200014747A (ko) | 2020-02-11 |
US20200092952A1 (en) | 2020-03-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20030161732A1 (en) | Overheat protection for fluid pump | |
JP6386737B2 (ja) | 真空ポンプ | |
CN110735805B (zh) | 真空泵 | |
US6814549B2 (en) | Liner for fluid pump motor | |
JP4222747B2 (ja) | 真空ポンプ | |
JP6331491B2 (ja) | 真空ポンプ | |
WO2018221345A1 (ja) | 真空ポンプとその加熱装置 | |
KR20160119758A (ko) | 진공 펌프, 및 이 진공 펌프에 이용되는 단열 스페이서 | |
JP2005083316A (ja) | モータ制御システム及び該モータ制御システムを搭載した真空ポンプ | |
JP6407905B2 (ja) | 主軸軸受保護装置及びそれを備えた工作機械 | |
JP6390478B2 (ja) | 真空ポンプ | |
CN201650763U (zh) | 前置平衡盘式单级屏蔽泵 | |
JP4899598B2 (ja) | ターボ分子ポンプ | |
GB2570503A (en) | Turbomolecular pump and method of operation | |
WO2020195943A1 (ja) | 真空ポンプ、及び、真空ポンプ構成部品 | |
JP7240911B2 (ja) | モータ、及び、モータの状態判定装置 | |
JPH116774A (ja) | ロータ温度検出装置及び温度検出方法 | |
JP2000291586A (ja) | 真空ポンプ | |
WO2022131035A1 (ja) | 真空ポンプ | |
JP2019183831A (ja) | 真空ポンプおよびこれを作動させるための方法 | |
JP7388280B2 (ja) | 温調機能付きターボ分子ポンプ | |
WO2023171566A1 (ja) | 真空ポンプ | |
JP6469174B2 (ja) | 電動機の制御装置、電動機システム、及び電動機の制御方法 | |
JPH10288190A (ja) | 磁気軸受装置 | |
CN116783391A (zh) | 真空泵 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 18810257 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 20197033435 Country of ref document: KR Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2018810257 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2018810257 Country of ref document: EP Effective date: 20200102 |