WO2013018272A1 - ガス排気用ポンプシステム及びガス排気方法 - Google Patents
ガス排気用ポンプシステム及びガス排気方法 Download PDFInfo
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- WO2013018272A1 WO2013018272A1 PCT/JP2012/004181 JP2012004181W WO2013018272A1 WO 2013018272 A1 WO2013018272 A1 WO 2013018272A1 JP 2012004181 W JP2012004181 W JP 2012004181W WO 2013018272 A1 WO2013018272 A1 WO 2013018272A1
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- Prior art keywords
- pump
- seal
- gap
- gas
- gas exhaust
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
- F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
- F04C27/008—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
- F04C27/009—Shaft sealings specially adapted for pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/0007—Injection of a fluid in the working chamber for sealing, cooling and lubricating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2220/00—Application
- F04C2220/30—Use in a chemical vapor deposition [CVD] process or in a similar process
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2230/00—Manufacture
- F04C2230/90—Improving properties of machine parts
- F04C2230/91—Coating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/023—Lubricant distribution through a hollow driving shaft
Definitions
- the present invention is, for example, a semiconductor device and an apparatus for manufacturing an electronic device (hereinafter referred to as “semiconductor applied electronic device”) using a semiconductor-related technology such as a liquid crystal display device, a solar cell, an organic EL device, and an LED, or
- semiconductor applied electronic device such as a liquid crystal display device, a solar cell, an organic EL device, and an LED
- the present invention relates to a gas exhaust pump system and a gas exhaust method used in an electronic device manufacturing apparatus for electronic devices.
- Non-Patent Document 1 As a gas exhaust pump capable of continuous operation at high speed for a long time, for example, a volume transfer screw pump having a pair of screw rotors in a housing is known (see Non-Patent Document 1). Among them, it is possible to exhaust a wide range from the molecular flow region to the viscous flow region, and it has a constant exhaust speed regardless of the gas type, and the ultimate pressure is high. The establishment and commercialization of mass production technology for lowering the cost of screw gas exhaust pumps is awaited.
- the above-mentioned pump has a wide range of pressure reduction, and the exhaust performance does not depend on the exhaust gas type. For example, the pump is changed for each gas type, and the pump is replaced in response to changes in pressure conditions. There is no inconvenience of preparing a pump suitable for each discharge location in the production system having The same type of pump may be used as long as it does not depend on the exhaust speed, and the trouble of selecting a pump for each exhaust location does not occur. If a low-cost pump of the above type is commercialized, its popularity will be significant and it is easily expected to contribute greatly to the development of the industry.
- FIG. 1 shows a schematic explanatory diagram of an example of the above-described pump.
- 1 has a female screw rotor 101 and a male screw rotor 102 having unequal leads and unequal inclination angles.
- the screw rotors 101 and 102 form screw male and female tooth groove engaging portions 104 by providing desired clearances and engaging the tooth grooves for the purpose of obtaining a safe and smooth rotational motion.
- the male and female screw rotors 101 and 102 are fixed to their respective rotating shafts (the rotating shaft of the female screw rotor is not shown, 105 is the rotating shaft of the male screw rotor), the meshed state is maintained.
- the rotors 101 and 102 are accommodated in the stator 106 with a predetermined gap between the leading edge of the tooth gap and the inner wall of the stator 106.
- the rotating shaft 105 is rotatable to the bearing body 116 via a clamping means, for example, specifically, an angular bearing 107 (four of 107a, 107b, 107c, and 107d are shown for convenience). It is attached.
- the male screw rotor 102 is fixed to the rotating shaft 105 and is rotated by the rotation of the rotating shaft 105.
- a lubricating oil supply path 109 is provided in the rotating shaft 105.
- Lubricating oil 111 is stored in a lubricating oil storage section 112 provided at a predetermined position below the base plate 110.
- the lubricating oil 111 sucks and raises the lubricating oil supply passage 109 due to the centrifugal force caused by the rotation, and is angular. It is poured into the bearing 107.
- An oil seal member 113 for preventing the diffusion of the lubricating oil is used to prevent the lubricating oil 111 from diffusing to a portion other than the angular bearing 107 through the gap between the rotating shaft 105 and the seal housing 108 as shown in the figure. It is provided on the entire circumference of the rotating shaft 105 so as to close the space between the housings 108. However, since it is assumed that the oil seal member 113 alone is insufficient, a seal gas such as N 2 is supplied to the gap between the rotary shaft 105 and the seal housing 108 as shown by the arrow in the figure through the seal gas supply path 114. Thus, the lubricating oil itself or its vapor is prevented from diffusing upstream of the vacuum system.
- the seal gas is supplied from the seal gas supply path 114 and is exhausted from a discharge path (not shown) together with a gas used in a semiconductor process such as film formation or etching through a predetermined flow path.
- the exhausted gas is sent to the gas resource reuse processing system and reused.
- the screw pump shown in FIG. 1 has a pair of (twin) screw rotors, but there is one screw rotor, and a gap is provided between the tooth tip surface of the tooth space of the screw rotor and the inner wall surface of the stator.
- Some pumps of this type use a seal gas in the same manner as described above to prevent the diffusion of lubricating oil for rotating the rotating shaft smoothly and continuously.
- One method for reducing the amount of seal gas flowing upstream is to narrow the gap between the rotary shaft 105 and the seal housing 108 to reduce the conductance of the gap space, thereby reducing the gap between the upstream side and the downstream side. There is an idea of creating a pressure difference.
- the width of the gap between the rotating shaft 105 and the seal housing 108 needs to be secured to ensure the safety of the rotation as a certain width or more from the viewpoint of restrictions on machining accuracy and expansion due to heat generated during operation.
- the gap width needs to have a margin as the rotational speed of the rotating shaft 105 increases.
- the present invention has been made in view of such problems, and an object of the present invention is to provide a gas exhaust pump system and a gas that can suppress the mixing of the seal gas into the process gas and reduce the amount of use. It is to provide an exhaust method.
- a first aspect of the gas exhaust pump system is a gas exhaust pump system having a main body pump and a sub pump, wherein the main body pump includes a screw rotor, A rotating shaft fixed to the screw rotor or integrally formed with the screw rotor and rotatably engaged with a rotation driving means for rotating the screw rotor, and the rotating shaft being rotatably held Nipping means, a lubricating oil supply passage having an oil inlet for pouring lubricating oil into the clamping means at one end, and a predetermined gap from the outer peripheral surface of the rotating shaft, are sandwiched by the clamping means of the rotating shaft A seal housing that covers the periphery of the unfinished part; The entire circumference of the rotary shaft is bridged between the rotary shaft and the seal housing, and the lubricating oil poured into the clamping means is prevented from entering the exhaust system space of the main body pump through the gap.
- a seal member a seal gas supply passage having a supply port for supplying seal gas to the gap, and a seal gas inlet for exhausting the seal gas supplied to the gap from the gap to the outside of the main body pump.
- the sub-pump is a pump for depressurizing the seal gas exhaust path.
- At least one of the outer peripheral surface of the rotating shaft and the inner peripheral surface of the seal housing is a par. It is characterized by having a film of fluoroalkoxyalkane (hereinafter referred to as “PFA”).
- PFA fluoroalkoxyalkane
- the PFA of the present invention is a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether containing a structure such as structural formula 1.
- Rf include an alkyl group having 2 or more fluorine atoms, for example, a fully fluorinated alkyl group.
- the number of carbon atoms in Rf is not particularly limited, but is 1 or more, preferably 2 or more, and is usually 12 or less, preferably 6 or less.
- the weight average molecular weight of the PFA of the present invention is not particularly limited, but preferably satisfies the melting point and density characteristics as described below.
- a gas exhaust pump system having a main body pump and a sub pump, wherein the main body pump is fixed to the rotor or the rotor.
- a rotating shaft that is integrally molded and rotatably engages with a rotation driving means for rotating the rotor, a clamping means that rotatably clamps the rotating shaft, and lubricating oil is injected into the clamping means
- a lubricating oil supply passage having an oil injection port at one end, a seal housing that covers a periphery of a portion of the rotating shaft that is not sandwiched by the sandwiching means with a predetermined gap from the outer peripheral surface of the rotating shaft; Lubricating oil that is bridged between the rotating shaft and the seal housing over the entire circumference of the rotating shaft and poured into the clamping means is exhausted through the gap.
- At least one of the outer peripheral surface of the rotating shaft and the inner peripheral surface of the seal housing is a PFA represented by structural formula 1. It is characterized by having this film
- a first aspect of the gas exhaust method according to the present invention is a gas exhaust method using a gas exhaust pump system having a main body pump and a sub pump, and the main body pump has an atmospheric pressure of less than atmospheric pressure.
- the screw rotor fixed to the screw rotor or integrally formed with the screw rotor, and a rotation drive means for rotating the screw rotor
- a rotating shaft that is rotatably engaged; a clamping means that rotatably clamps the rotating shaft; a lubricating oil supply passage that has an oil inlet at one end for injecting lubricating oil into the clamping means; and
- a seal housing that covers a periphery of a portion of the rotating shaft that is not sandwiched by the sandwiching means with a predetermined gap from the outer peripheral surface; A seal that is bridged between the rotating shaft and the seal housing over the entire circumference of the rotating shaft and prevents the lubricating oil poured into the clamping means from entering the exhaust system space
- a seal gas supply path having a supply port for supplying seal gas to the gap on the upstream side of the seal member, and the seal gas supplied to the gap is exhausted from the gap to the outside of the main body pump.
- a seal gas exhaust passage having a seal gas inlet for the downstream side of the seal member, and the sub-pump is connected to the seal gas exhaust passage to depressurize the seal gas exhaust passage, and the gas exhaust When operating the pump system for operation, it includes a step of interlocking the exhaust operation of the main body pump and the decompression operation of the sub pump.
- a second aspect of the gas exhaust method according to the present invention is a gas exhaust method using a gas exhaust pump system having a main body pump and a sub pump, and the main body pump has an atmospheric pressure of less than atmospheric pressure.
- the rotor is connected to the process chamber so that the pressure can be reduced, and the rotor is fixed to the rotor or formed integrally with the rotor, and the rotary drive means for rotating the rotor is rotatably associated with the rotor.
- a rotating shaft to be joined a clamping means for rotatably holding the rotating shaft, a lubricating oil supply passage having an oil injection port at one end for injecting lubricating oil to the clamping means, and an outer peripheral surface of the rotating shaft
- a seal housing covering a portion of the rotating shaft that is not clamped by the clamping means, and the rotating shaft and the seal over the entire circumference of the rotating shaft.
- a seal member which is bridged between the housing and prevents the lubricating oil poured into the clamping means from entering the exhaust system space of the main body pump through the gap, and a supply for supplying the seal gas to the gap
- a seal gas supply passage having a port on the upstream side of the seal member, and a seal gas suction port for exhausting the seal gas supplied to the gap out of the main body pump from the gap on the downstream side of the seal member.
- the sub-pump is connected to the seal gas exhaust path in order to depressurize the seal gas exhaust path, and when the gas exhaust pump system is operated, the exhaust of the main body pump
- the method includes a step of interlocking the operation and the decompression operation of the sub-pump.
- the mixing of the seal gas into the process gas can be suppressed and the amount of use thereof can be reduced, the gas recovery efficiency in the gas resource recycling process can be improved, and the semiconductor device and the functional device The cost of the entire production system can be reduced.
- FIG. 2 is a schematic explanatory diagram of an example of a gas exhaust pump system for explaining the present invention. Since the screw pump (main body pump) shown in FIG. 2 is essentially the same as the screw pump shown in FIG. 1, the same numbers as those in FIG.
- An unequal lead / unequal inclination angle screw gas exhaust pump (main body pump) 100 shown in FIG. 1 includes a female screw rotor 101 and a male screw rotor 102 having unequal lead / unequal inclination angles.
- the screw rotors 101 and 102 form screw male and female tooth groove engaging portions 104 by providing desired clearances and engaging the tooth grooves for the purpose of obtaining a safe and smooth rotational motion.
- the meshed state is maintained.
- the rotors 101 and 102 are accommodated in the stator 106 with a predetermined gap 117 provided between the leading edge of the tooth gap and the inner wall of the stator 106.
- the rotating shaft 105 is rotatably held by a holding means.
- the clamping means is specifically constituted by, for example, an angular bearing 107 (four of 107 a, 107 b, 107 c, and 107 d are shown for convenience) and a bearing body 116. Is done.
- the male screw rotor 102 is fixed to the rotating shaft 105 and is rotated by the rotation of the rotating shaft 105.
- a lubricating oil supply path (lubricating path) 109 having an oil inlet 213 for pouring lubricating oil into the angular bearing 107 is provided.
- Lubricating oil 111 is stored in a lubricating oil storage section 112 provided at a predetermined position below the base plate 110.
- an oil seal member 113 for preventing the diffusion of the lubricating oil prevents the lubricating oil 111 from diffusing to a portion other than the angular bearing 107 through the gap 117 between the rotating shaft 105 and the seal housing 108. It is provided on the entire circumference of the rotary shaft 105 so as to close the space between the seal housings 108. That is, the seal member 113 is located above the oil inlet 213 in order to prevent the lubricating oil component poured into the clamping means from entering the exhaust system space (screw side exhaust system space) of the pump body through the gap 117. Thus, the entire circumference of the rotary shaft 105 is bridged between the rotary shaft 105 and the seal housing 108.
- a seal gas such as N 2 gas is sealed in the gap between the rotary shaft 105 and the seal housing 108 as shown by the arrow in the figure through the seal gas supply path 114.
- the gas supply port 215 By supplying the gas from the gas supply port 215, the lubricating oil itself or its vapor is prevented from diffusing to the upstream side of the vacuum system (upstream side from the screw side exhaust system space).
- the supply of the seal gas to the gap 117 and the exhaust of the seal gas from the gap 117 are performed in a seal gas supply path 114 having a seal gas supply port 215 for supplying the seal gas to the gap 117 on the upstream side of the seal member 113. And a seal gas exhaust passage having a seal gas inlet 214 on the downstream side of the seal member 113 for exhausting the seal gas supplied to the gap 117 to the outside of the pump body.
- the seal gas supplied from the seal gas supply path 114 and flowing to the upstream side of the gap 117 passes through a predetermined flow path (screw side exhaust system space of the main body pump 100) together with a gas used in semiconductor processes such as film formation and etching. It is exhausted to the outside through a discharge path (not shown).
- the seal gas supplied from the seal gas supply path 114 and flowing to the downstream side of the gap 117 is sent to the exhaust system (not shown) from the exhaust port 208 via the seal gas exhaust path 201.
- the screw pump 100 is connected to a seal gas exhaust path 201 having an exhaust port 208 at its end, which is made of, for example, a stainless steel pipe, whose inner surface is subjected to a predetermined gas resistance treatment, on the downstream side of the seal gas discharge path 115. ing.
- the seal gas exhaust path 201 is provided with a sub pump 202 constituted by a diaphragm pump, a pressure gauge 203, a valve 204 constituted by a needle valve, a flow meter 205, a pressure gauge 206, and an oil trap 207 from the downstream side. It is.
- the exhaust port 208 is connected to an exhaust gas treatment system.
- the oil trap 207 traps the component of the lubricating oil that enters the seal gas exhaust passage 201 through the seal gas discharge passage 115, and the lubricant component flows to the downstream side of the oil trap 207. To prevent. Therefore, the component of the lubricating oil is not mixed with the exhaust gas exhausted to the exhaust gas processing system, and the exhaust gas separation process can be performed smoothly. If there is a plug 209, the oil trap 207 is essentially not required.
- the plug 209 opens the block to allow the downstream side of the seal gas discharge path 115 to communicate with the original exhaust path space of the pump 100 (the screw-side exhaust system space of the main body pump 100), and the upstream and downstream sides of the seal member 113. It has the function of reducing the pressure difference with the side.
- the plug 209 is opened, the lubricating oil enters the seal gas discharge passage 115 and is mixed into the discharged seal gas, so that the plug 209 is normally closed.
- the gas exhaust pump system shown in FIG. 2 can adjust the pressure difference between the upstream side and the downstream side of the seal member 113 by adjusting the exhaust amount of the screw pump 100 and the sub pump 202.
- the pressure inside the seal gas discharge passage 115 is reduced to an atmospheric pressure or lower, so that the pressure difference between the upstream side and the downstream side of the seal member 113 can be made small.
- the amount of flowing seal gas can be relatively reduced.
- One method for reducing the amount of seal gas flowing upstream is to narrow the gap between the rotary shaft 105 and the seal housing 108 to reduce the conductance of the gap space, thereby reducing the gap between the upstream side and the downstream side.
- the shaft seal mechanism according to the present invention includes a rotating shaft 105 and a seal housing 108.
- the rotating shaft 105 and the seal housing 108 are disposed with a predetermined gap 117.
- a PFA film is provided on the outer surface (outer wall surface 211) of the rotary shaft 105 and / or the inner surface (inner wall surface 210) of the seal housing 108 (in FIGS. 1 and 2, the inner surface of the seal housing 108 for convenience).
- An example in which a PFA film 212 is provided is shown.
- the PFA film 212 provided on at least one surface of the rotary shaft 105 and the seal housing 108 is a wall surface forming at least a gap 117 of the shaft seal mechanism member. After the coating of PFA, it is formed through a process of melting and remelting, thereby imparting high smoothness to its free surface.
- the PFA employed in the present invention is manufactured and sold by many companies. Among them, in the present invention, it is preferable that the melting point is 298 to 310 ° C. and the density is 2.12 to 2.17. Further, when it is necessary to consider the case of using at high temperature, it is desirable to select the highest continuous use temperature, preferably at least 260 ° C.
- the thermal conductivity is preferably 0.25 W / m ⁇ k or more, for example.
- the melt viscosity of PFA is an important factor for forming a film having high surface smoothness and no waviness. If the melt viscosity is too high, it is difficult to obtain high surface smoothness and undulation is likely to occur.
- the melt viscosity of PFA in the present invention is preferably 10 g / 10 min or more, more preferably 20 g / 10 min or more, in accordance with ASTM D3307. Of course, if the coating is made uniform and the melting time is sufficiently long, a PFA film having high surface smoothness without waviness can be obtained even if it has a somewhat high melt viscosity.
- PFA those shown below are preferably employed.
- AC-5539 for electrostatic coating polymer thick coating, powder
- Other AC sequences include AC-5600, ACX-21, ACX-31, ACX-31WH, ACX-34, and ACX-41.
- AD-2CRE coating film thickness: 10 to 15 ⁇ m
- AW-5000L coating film thickness: 30 to 40 ⁇ m
- the coating conditions of AD-2CRE are preferably a spray gun nozzle diameter of 1.0 mm ⁇ and an atomization pressure of 0.2 MPa as air spray conditions.
- the coating conditions of AW-5000L are preferably a spray gun nozzle diameter of 1.0 to 1.2 mm ⁇ and an atomization pressure of 0.2 to 0.4 MPa as air spray conditions.
- Examples of the primer made by Daikin Industries, Ltd. preferably used in the present invention as a primer include the following. ED-1939D21L, EK-1908S21L, EK-1909S21L, EK-1959S21L, EK-1983S21L, EK-1208M1L, EK-1209BKEL, EK-1209M10L, EK-1283S1L as water-based primers, TC -1509M1, TC-1559M2, TC-11000, etc.
- the coating conditions for primer application are, for example, a spray gun nozzle diameter of 1.0 to 1.2 mm ⁇ , an atomization pressure of 0.2 to 0.4 MPa, or a spray gun nozzle diameter of 1.0 to 1.5 mm ⁇ .
- the pressure is 0.2 to 0.3 MPa.
- the drying is performed at a temperature of 80 to 90 ° C. and a time of 10 to 15 minutes.
- MP-102 for micropowder and topcoat
- MP-103 for micropowder and topcoat
- MP-300 for fluorinated powder and topcoat
- MP-310 fluorinated powder, for top coat
- MP-630 conductive powder
- MP-642 conductive powder
- MP-620 high thermal conductivity
- MP-621 thermal conductivity is high) High
- MP-622 high thermal conductivity
- MP-623 high thermal conductivity
- MP-501 for articles that cannot be electrostatically coated due to complex shapes
- MP-502 complex Suitable for articles that cannot be electrostatically coated due to its shape
- SL-800BK with carbon filler
- SL-800LT with glass filler
- MP-103, MP-300, and MP-310 are preferable in the present invention because the resulting film is excellent in flatness.
- MP-310 is particularly preferable because it has excellent spherulite control of about 5 ⁇ m in fineness and uniformity.
- SL-800BK is preferable in the present invention in terms of heat dissipation because it has good heat conduction and excellent heat dissipation.
- MP-630,642 conductive micropowder
- PFA material is also used as a preferred PFA material in the present invention in terms of good heat conduction and excellent heat dissipation.
- RFA in the structural formula 1 is “-CF2CF2CF3”, the molecular weight is several hundred thousand to one million, and the melting point is 300. -310 ° C, viscosity: 104-105 poise (380 ° C), maximum continuous use temperature: 260 ° C.
- those of the PFA primer PL-902 series sold as a general aqueous general-purpose primer and the PFA primer PL-910 series sold as a primer excellent in heat resistance and corrosion resistance are preferable. Specifically, it is sold under the brand names PL-902YL, PL-902BN, PL-902AL, PL-910YL, PL-910BN, PL-910AL, and PL-914AL.
- NK-108 lubricity, standard film thickness 50 ⁇ m, heat resistance temperature 260 ° C
- NK-372,379 lubrication, antistatic, standard film thickness 100, 300 ⁇ m, heat resistance temperature 260 ° C
- NK-013, 013C wear resistance
- NF-015 standard film thickness 50 ⁇ m
- NF-015EC standard film thickness 40 ⁇ m, antistatic
- NF-020AC standard film thickness 600 ⁇ m, antistatic
- the base material to be processed into the shaft seal mechanism member in the present invention is preferably a metal base material for a member to be added which has good heat conduction and can be suitable for processing, such as stainless steel, aluminum-based metal such as aluminum or aluminum alloy. Is adopted.
- the rotary shaft and the seal housing are engaged with each other so that the rotary shaft is rotatable via an angular bearing. Since frictional heat is generated between the bearings, it is desirable to select a base material with good heat conduction for the rotating shaft and the seal housing in order to further enhance the heat dissipation effect.
- an aluminum-based metal As such a base material, it is desirable to select an aluminum-based metal because of its light weight, but it is desirable to select a material that is as hard as possible and has a low thermal expansion coefficient.
- an aluminum alloy containing pure metal and other metals is employed in the present invention.
- the aluminum alloy in the present invention is made of a metal mainly composed of aluminum.
- the metal containing aluminum as a main component is a metal that usually contains 50% by mass or more of aluminum.
- the metal contains 80% by mass or more of aluminum, more preferably 90% by mass or more, and still more preferably 94% by mass of aluminum. % Or more is desirable.
- Preferred metals contained in the aluminum alloy include at least one metal selected from the group consisting of magnesium, titanium and zirconium. Of these, magnesium is particularly preferred because it has the advantage of improving the strength of the aluminum alloy.
- the aluminum alloy may be a metal mainly composed of high-purity aluminum in which the content of specific elements (iron, copper, manganese, zinc, chromium) is suppressed.
- the total content of these specific elements is preferably 1.0% by mass or less, more preferably 0.5% by mass or less, and still more preferably 0.3% by mass or less.
- the aluminum alloy containing high-purity aluminum as a main component may contain one or more other metals capable of forming an alloy with aluminum as required.
- a metal is not particularly limited as long as it is other than the above-mentioned specific element, but preferred metals include at least one metal selected from the group consisting of magnesium, titanium and zirconium.
- magnesium is particularly preferred because it has the advantage of improving the strength of the aluminum alloy.
- the magnesium concentration is not particularly limited as long as it can form an alloy with aluminum, but is usually 0.5% by mass or more, preferably 1.0% by mass or more, in order to provide sufficient strength improvement. Preferably it is 1.5 mass% or more. In order to form a uniform solid solution with aluminum, it is preferably 6.5% by mass or less, more preferably 5.0% by mass, still more preferably 4.5% by mass or less, and most preferably 3% by mass. It is as follows.
- the aluminum alloy in the present invention may contain other metal components as a crystal adjusting agent in addition to the above metals. There is no particular limitation as long as it has a sufficient effect on crystal control, but zirconium or the like is preferably used.
- the individual content of metals other than aluminum positively contained in the aluminum alloy is usually 0.01% by mass or more, preferably 0%, based on the entire aluminum alloy. 0.05% by mass or more, and more preferably 0.1% by mass or more.
- the lower limit of this content is necessary for fully expressing the characteristics of the contained metal. However, it is usually 20% by mass or less, preferably 10% by mass or less, more preferably 6% by mass or less, particularly preferably 4.5% by mass or less, and most preferably 3% by mass or less. This upper limit is necessary in order for aluminum and other metal components other than aluminum to form a uniform solid solution and maintain good material properties.
- the stainless steel substrate is preferably SUS316 for low corrosion steel, SUS316L for low carbon steel, or SUS316L-EP whose surface is polished by electrolytic polishing in advance.
- SUS316L for low corrosion steel
- SUS316L-EP whose surface is polished by electrolytic polishing in advance.
- it is not limited to these substrates as long as it meets the purpose and conditions of use. For example, if importance is attached to hardness, iron-based materials such as SCM and S45C are also used.
- a base material to be processed as a shaft seal mechanism member for a screw pump according to the present invention (also referred to as “member to be processed”)
- the PFA film installation surface is preferably smoothed by means such as electrolytic polishing, mechanical polishing, or both to give desired smoothness.
- the smoothness of the polished surface at this stage is preferably equal to or less than the average particle size of the PFA powder.
- underlayer film a film composed of Al 2 O 3 , Ni, or NiF 2 (referred to as “underlayer film”) is used in advance. It is desirable to provide it on the PFA film installation surface of the substrate.
- the Ni film has high corrosion resistance and high adhesion to the PFA film, it is preferable as a base film for the PFA film.
- a base film for the PFA film for example, an electroless nickel plating method or a plasma sputtering method of forming a film by sputtering Ni is employed. MOCVD using an organic complex can also be employed.
- the plating solution contains a reducing agent, but P (phosphorus) or B (boron) can be contained in the obtained Ni film depending on the reducing agent used.
- hypophosphite When hypophosphite is used as the reducing agent, P (phosphorus) can be contained in the obtained Ni film, and when dimethylamine borane (DMAB) is used, B (boron) is contained in the Ni film. I can do it.
- B (boron) When B (boron) is contained in the Ni film, the hardness of the film can be increased and the electric resistance of the film can be lowered as compared with the case where P (phosphorus) is contained in the Ni film. It can be used properly according to.
- the use of hydrazine as the reducing agent is advantageous because it does not generate hydrogen gas during the reaction unlike hypophosphorous acid or DMAB.
- the amount of P (phosphorus) contained in the Ni film is appropriately determined depending on the use of the reaction vessel, but is preferably a chemical composition, Ni: 83 to 98%, P: 2 to 15%, and others: 0 to 2% is desirable.
- the chemical composition is Ni: 97 to 99.7%, B: 0.3 to 3%, and other: 0 to 2.7%.
- the electroless nickel plating is commercially available and can be prepared by itself, so it may be performed by itself, but even if it is processed by a third party based on the specifications, The goal is achieved.
- a commercially available electroless nickel plating solution is manufactured or sold by, for example, Tool System Co., Ltd., World Metal Co., Ltd., Metal Processing Technology Laboratory Co., Ltd., Okuno Pharmaceutical Co., Ltd., Uemura Kogyo Co., Ltd. or the like.
- the companies that perform electroless nickel plating processing include Nippon Kanisen Co., Ltd., Hitachi Kyowa Engineering Co., Ltd., Sanwa Plating Industry Co., Ltd., Kodama Co., Ltd., Shimizu Naga Metal Industry Co., Ltd., Daiwa Electric Industry Co., Ltd., Nishina Industrial Co., Ltd. Company, Fujima Seiren Co., Ltd.
- the free surface of the Ni film provided on the PFA film installation surface of the workpiece may be fluorinated.
- a base material provided with a Ni film on the surface is set in a vacuum vessel, and after reaching a predetermined degree of vacuum, F 2 gas is supplied into the vacuum vessel and the surface of the Ni film is F 2 gas.
- F 2 gas is supplied into the vacuum vessel and the surface of the Ni film is F 2 gas.
- the entire Ni film can be made into a NiF 2 film, or it can have a two-layer structure such that the lower part is a Ni film and the upper part is a NiF 2 film. .
- the distribution of F atoms in the thickness direction of the film can be changed. For example, it is possible to continuously reduce the distribution amount of F atoms in the film from the free surface toward the lower part of the film. In this case, the close contact with the substrate and the close contact with the PFA film can be further strengthened.
- P (phosphorus) or B (boron) has the above chemical composition. Needless to say, it is contained in the film.
- annealing is performed for a desired time at a desired temperature in an atmosphere such as a rare gas or a nitrogen gas, whereby the film is applied to the substrate. Since the adhesion force and hardness can be greatly increased, this method is a preferred undercoat post-treatment method in the present invention.
- annealing it is preferable to perform annealing for about 1 hour in a temperature range of 260 to 350 ° C., for example, in a nitrogen atmosphere.
- An anodic oxidation method capable of forming a non-porous Al 2 O 3 film is preferably employed to provide an Al 2 O 3 film as a base film on the PFA film installation surface of an aluminum alloy workpiece. .
- the film formed by this anodic oxidation method is formed by an anodic oxidation method described later on at least the PFA film installation surface of the workpiece.
- This Al 2 O 3 anodic oxide film is a film made of an oxide of a metal mainly composed of aluminum, and can be easily formed with a thickness of 10 nm or more. Since this film is a passive film, it exhibits high performance as a protective film when formed on a predetermined surface of an aluminum alloy shaft seal mechanism constituent member.
- the film thickness of the Al 2 O 3 anodized film is preferably 100 ⁇ m or less. If the film is thick, cracks are likely to occur and outgas is likely to be released. Therefore, the film thickness of the Al 2 O 3 anodized film is more preferably 10 ⁇ m or less, further preferably 1 ⁇ m or less, still more preferably 0.8 ⁇ m or less, and particularly preferably 0.6 ⁇ m or less. The lower limit of the film thickness is desirably 10 nm or more. If the film thickness is too thin, sufficient corrosion resistance cannot be obtained. The thickness of the Al 2 O 3 anodic oxide film is more preferably 20 nm or more, and even more preferably 30 nm or more.
- the non-porous Al 2 O 3 film in the present invention is superior in corrosion resistance to a porous Al 2 O 3 film having a porous structure that has been used conventionally, and has fine pores and pores. There is an advantage that it does not or hardly adsorbs moisture or the like because it has no or almost no (substantially).
- the Al 2 O 3 anodic oxide film is obtained by anodizing a predetermined surface of an aluminum alloy shaft seal mechanism constituent member using a chemical conversion solution having a pH of 4 to 10. According to this method, there is an advantage that a dense and non-porous anodic oxide film can be easily obtained.
- the lower limit of the pH value of the chemical conversion solution is 4 or more, preferably 5 or more, and more preferably 6 or more.
- the upper limit of the pH value of the chemical conversion liquid is usually 10 or less, preferably 9 or less, more preferably 8 or less.
- the pH value is neutral or near neutral, or as close as possible to neutral. It is desirable.
- the chemical conversion solution is preferably in the range of pH 4 to 10 in order to buffer the concentration fluctuation of various substances during anodization and keep the pH within a predetermined range (buffering action). Therefore, it is desirable to include a compound such as an acid or salt exhibiting a buffering action (hereinafter sometimes referred to as “compound (A)”).
- the type of such a compound is not particularly limited, but is preferably at least one selected from the group consisting of boric acid, phosphoric acid, organic carboxylic acid, and salts thereof from the viewpoint of high solubility in the chemical conversion solution and good dissolution stability. is there. More preferably, it is an organic carboxylic acid or a salt thereof that hardly contains boron and phosphorus elements in the anodized film.
- the concentration of these compounds (A) may be appropriately selected according to the purpose, but is usually 0.01% by mass or more, preferably 0.1% by mass or more, more preferably 1% by mass with respect to the whole chemical conversion liquid. That's it.
- Increasing the electrical conductivity is desirable in order to sufficiently form the anodic oxide film. However, it is usually 30% by mass or less, preferably 15% by mass or less, more preferably 10% by mass or less. In order to keep the performance of the anodized film high and to reduce the cost, it is desirable that the content be 10% by mass or less.
- the chemical conversion liquid in the present invention preferably contains a non-aqueous solvent.
- a chemical conversion solution containing a non-aqueous solvent has an advantage that it can be processed at a high throughput because the time required for the constant current conversion is shorter than that of an aqueous chemical conversion solution.
- OH ions generated by water electrolysis etch the anodic oxide film to make it porous, so a main solvent having a low dielectric constant that can suppress water electrolysis is used. It is preferable to use it.
- the type of the non-aqueous solvent is not particularly limited as long as it can be anodized satisfactorily and has sufficient solubility in a solute, but a solvent having one or more alcoholic hydroxyl groups and / or one or more phenolic hydroxyl groups, Or an aprotic organic solvent is preferable. Among these, a solvent having an alcoholic hydroxyl group is preferable from the viewpoint of storage stability.
- Examples of the compound having an alcoholic hydroxyl group include monohydric alcohols such as methanol, ethanol, propanol, isopropanol, 1-butanol, 2-ethyl-1-hexanol and cyclohexanol; ethylene glycol, propylene glycol, butane-1,4 -Dihydric alcohols such as diol, diethylene glycol, triethylene glycol, and tetraethylene glycol; trihydric or higher polyhydric alcohols such as glycerin and pentaerythritol can be used.
- numerator can also be used.
- those having two or more alcoholic hydroxyl groups are preferable in view of miscibility with water and vapor pressure, more preferably dihydric alcohols and trihydric alcohols, and particularly preferably ethylene glycol, propylene glycol, and diethylene glycol.
- These compounds having an alcoholic hydroxyl group and / or a phenolic hydroxyl group may further have other functional groups in the molecule.
- a solvent having an alkoxy group together with an alcoholic hydroxyl group such as methyl cellosolve and cellosolve can also be used.
- aprotic organic solvent either a polar solvent or a nonpolar solvent may be used.
- the polar solvent is not particularly limited, and examples thereof include cyclic carboxylic acid esters such as ⁇ -butyrolactone, ⁇ -valerolactone, and ⁇ -valerolactone; chain carboxylic acid esters such as methyl acetate, ethyl acetate, and methyl propionate.
- Cyclic carbonates such as ethylene carbonate, propylene carbonate, butylene carbonate, vinylene carbonate; chain carbonates such as dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, N-methylformamide, N-ethylformamide, N, N— Amides such as dimethylformamide, N, N-diethylformamide, N-methylacetamide, N, N-dimethylacetamide, N-methylpyrrolidone, acetonitrile, glutaronitrile, adiponitrile, methoxya Tonitoriru, 3-methoxy nitriles such as propionitrile; trimethyl phosphate, phosphates such as triethyl phosphate.
- the nonpolar solvent is not particularly limited, and examples thereof include hexane, toluene, and silicone oil.
- non-aqueous solvent for the chemical conversion liquid used for forming the anodic oxide film
- ethylene glycol propylene glycol, or diethylene glycol, which may be used alone or in combination.
- nonaqueous solvent you may contain water.
- the non-aqueous solvent is usually contained in an amount of 10% by mass or more, preferably 30% by mass or more, more preferably 50% by mass or more, particularly preferably 55% by mass or more, and usually 95% by mass or less, based on the whole chemical conversion liquid. , Preferably 90% by mass or less, particularly preferably 85% by mass or less.
- the content thereof is usually 1% by mass or more, preferably 5% by mass or more, more preferably 10% as a lower limit with respect to the whole chemical conversion liquid.
- the upper limit is usually 85% by mass or less, preferably 50% by mass or less, and particularly preferably 40% by mass or less.
- the lower limit of the ratio of water to the non-aqueous solvent is preferably 1% by mass or more, preferably 5% by mass or more, more preferably 7% by mass or more, and particularly preferably 10% by mass or more.
- the upper limit is usually 90% by mass or less, preferably 60% by mass or less, more preferably 50% by mass or less, and particularly preferably 40% by mass or less.
- the chemical conversion liquid may contain other additives as necessary.
- the additive is not particularly limited and may be used by adding one or more substances selected from known additives and other substances. At this time, there is no special restriction
- the electrolytic method for anodizing is not particularly limited.
- the current waveform for example, in addition to direct current, a pulse method in which an applied voltage is periodically interrupted, a PR method in which the polarity is inverted, other alternating current, AC / DC superimposition, incomplete rectification, a modulation current such as a triangular wave, or the like can be used.
- a direct current is used.
- the method for controlling the current and voltage of anodic oxidation is not particularly limited, and conditions for forming an oxide film on the inner surface of the aluminum alloy container body 1 can be appropriately combined.
- the formation is performed at a constant current up to a predetermined formation voltage Vf, and after the formation voltage is reached, the voltage is held for a certain period of time to perform anodization.
- the current density is usually 0.001 mA / cm 2 or more, preferably 0.01 mA / cm 2 or more.
- the current density is usually 100 mA / cm 2 or less, preferably 10 mA / cm 2 or less.
- the formation voltage Vf is usually 3 V or more, preferably 10 V or more, more preferably 20 V or more. Since the obtained oxide film thickness is related to the formation voltage Vf, it is preferable to apply the voltage or more in order to give a certain thickness to the oxide film. However, it is usually set to 1000 V or less, preferably 700 V or less, and more preferably 500 V or less. Since the obtained oxide film has high insulating properties, it is preferable to carry out at the voltage or lower in order to form a high-quality oxide film without causing high dielectric breakdown.
- the temperature at the time of anodization is set to a temperature range in which the chemical conversion liquid exists stably as a liquid. Usually, it is ⁇ 20 ° C. or higher, preferably 5 ° C. or higher, more preferably 10 ° C. or higher. In consideration of production, energy efficiency, and the like at the time of anodization, it is preferable to perform the treatment at the temperature or higher. However, it is usually 150 ° C. or lower, preferably 100 ° C. or lower, and more preferably 80 ° C. or lower. In order to maintain the composition of the chemical conversion solution and perform uniform anodic oxidation, the treatment is preferably performed at the temperature or lower.
- the anodization includes a first step in which a predetermined surface of the aluminum alloy shaft seal mechanism constituting member and a counter electrode (for example, platinum) are disposed in the chemical conversion liquid, and the aluminum reaction vessel main body or the structure thereof.
- a positive voltage is applied to the electrode for a predetermined time by applying a negative voltage to the electrode, and a constant voltage is applied between the electrode made of the aluminum alloy shaft seal mechanism and the electrode for a predetermined time.
- the predetermined time of the second step is until the voltage between the aluminum alloy shaft seal mechanism constituting member and the predetermined electrode reaches a predetermined value (for example, 200 V when ethylene glycol is used). It is preferable that
- the predetermined time of the third step is preferably set until the current between the aluminum alloy shaft seal mechanism constituting member and the predetermined electrode reaches a predetermined value.
- the current value rapidly decreases when the voltage reaches the predetermined value, and then gradually decreases with time (referred to as “residual current”).
- residual current in order to fall below the predetermined current value at the end of the constant voltage process, for example, 24 It takes time.
- the quality of the Al 2 O 3 anodized film obtained is equivalent to that obtained by heat treatment. Further, the smaller the residual current, the better the quality of the Al 2 O 3 anodized film. In consideration of these matters, in order to increase productivity, it is desirable to stop the constant voltage treatment at an appropriate time and perform heat treatment (annealing) in the next step.
- the heat treatment is preferably performed at 150 ° C. or higher, more preferably at about 300 ° C. for 0.5 to 1 hour.
- the constant voltage process may be continuously performed, and if it is long, the process may be switched to the heat treatment.
- the second step it is desirable to pass a current of 0.01 to 100 mA, preferably 0.1 to 10 mA, more preferably 0.5 to 2 mA per square centimeter.
- the voltage is set such that the chemical conversion liquid does not cause electrolysis.
- the nonporous Al 2 O 3 anodized film formed during the chemical conversion treatment has an amorphous structure as a whole. Therefore, it is considered that there are almost no grain boundaries such as crystals. Further, by adding a compound having a buffering action or using a non-aqueous solvent as a solvent, a trace amount of carbon component is taken into the anodized film and the bonding strength of Al—O is weakened. This presumably stabilizes the amorphous structure of the entire film.
- the Al 2 O 3 anodized film manufactured as described above is preferably subjected to a heat treatment for the purpose of completely removing moisture in the film.
- an anodic oxide film of Al formed on an aluminum alloy base material mainly composed of high-purity aluminum that does not substantially contain the specific element has a high thermal stability and is difficult to form voids or gas reservoirs. There is. For this reason, even when annealing at about 300 ° C. or higher, almost no voids or seams are generated in the Al anodic oxide film, so that elution of aluminum into the reaction solution due to generation of particles and exposure of aluminum can be suppressed.
- the temperature of the heat treatment is not particularly limited, but is usually 100 ° C. or higher, preferably 200 ° C. or higher, and more preferably 250 ° C. or higher.
- the time for the heat treatment is not particularly limited, and may be appropriately set in consideration of surface roughness due to heat treatment, productivity, etc., but is usually 1 minute or more, preferably 5 minutes or more, particularly preferably 15 More than a minute.
- the gas atmosphere in the furnace during the annealing treatment is not particularly limited, but usually nitrogen, oxygen, or a mixed gas thereof can be appropriately used. Among them, an atmosphere having an oxygen concentration of 18 vol% or more is preferable, a condition of 20 vol% or more is more preferable, and a condition of oxygen concentration of 100 vol% is most preferable.
- the thickness of the base film is determined so that the smoothness of the surface on which the PFA film is provided can be sufficiently ensured as desired, the smoothness of the PFA film installation surface of the substrate, and the average particle size of the PFA powder used. Alternatively, it is selected as desired in a timely manner in view of the average particle diameter of the PFA particles dispersed in the PFA paint.
- it is preferably 0.1 to 30 ⁇ m, more preferably 1 to 20 ⁇ m, and still more preferably 2 to 15 ⁇ m.
- PFA film formation surface In order to provide the PFA film on the PFA film installation surface or the base film surface of the workpiece (referred to as “PFA film formation surface” together), it is also described in Experiments 1 and 2 and Examples described later. However, the following is preferable.
- the prepared PFA includes a fine powder form for electrostatic coating and a liquid form similar to general paints.
- the painting method in the case of liquid paints as well as general paints, it is desirable to paint by spray coating, but depending on the substrate, it is painted by dip coating, dip spin coating, roll coating, and spin flow coating. It is also adopted as appropriate. Further, it is desirable that the powder coating is processed by electrostatic powder coating or electrostatic fluid dipping.
- the PFA paint thus applied is baked onto the PFA film forming surface of the workpiece, and at that time, a melting and remelting process is applied, and finally a PFA having a desired smoothing performance. A coating film is obtained.
- the method of processing the coating film on the PFA film-formed surface of the member to be processed varies depending on the type of substrate, application, and type of paint to be selected, but preferably the following processing is performed.
- a top coat layer can be formed.
- the coating thickness per time in this case is the form of PFA to be used (powder or paint), the viscosity at the time of melting treatment, the dispersion concentration and particle size of PFA in the case of paint, the particle size of powder in the case of powder, Etc.
- the coating thickness per time is preferably 1 to 100 ⁇ m.
- the primary firing temperature in the first and intermediate coatings is set as the intermediate primary firing temperature
- the primary firing temperature in the final coating is set as the final primary firing temperature
- the intermediate primary firing temperature and the final primary firing temperature may be set to the same temperature.
- the intermediate primary firing temperature is set lower than the final primary firing temperature. It is desirable to be done.
- (3), (5), (6) may be omitted in some cases.
- the processing of (3), (5), (6) If the substrate and the top coat are firmly bonded by the primer by performing primer coating, the processing (3) can be omitted.
- the temperature and time of the primary firing in the present invention are the impurities (low molecular weight components, unfluorinated end groups) contained in the PFA material (available in powder form or paint form) by primary firing from the coated PFA film. It is desirable that the temperature and the time be sufficient to discharge the components having the above, products in the course of synthesis, additives such as surfactants, etc.) out of the membrane.
- the upper limit of the primary baking temperature is a temperature at which PFA having a molecular weight necessary for constituting a PFA film giving high smoothness is not decomposed (denoted as “PFA decomposition temperature”), or a temperature slightly higher than the decomposition temperature ( It is desirable to be written as “Th”. Th is determined in relation to the time for holding the PFA coating film at the temperature in the primary firing.
- Th is preferably set 30 to 70 ° C. higher than the melting point of PFA to be used. If the set temperature is too low, sufficient smoothness may not be obtained in secondary firing, and if it is too high, decomposition of PFA may be promoted. More preferably, it is 35 to 60 ° C, and still more preferably 40 to 50 ° C.
- the primary firing time in the present invention includes a time for raising the temperature to the primary firing temperature (primary firing temperature raising time) and a time for maintaining the primary firing temperature (primary firing temperature holding time).
- the temperature raising speed is controlled by the control device so that heat is uniformly transmitted to any part of the PFA coating film and the PFA coating film is uniformly fired.
- the primary firing temperature holding time is a time for melting the entire free surface of the PFA coating film as uniformly as possible so that the local non-uniformity cannot be seen visually.
- the primary firing temperature holding time depends on the thickness and size of the PFA coating film, and thus is appropriately determined each time depending on the thickness and size of the PFA coating film. It is desirable to set it to -50 minutes, more preferably 15-40 minutes.
- the smoothness of the film obtained through the secondary firing depends on the firing temperature, the temperature rise speed to the firing temperature and the setting of the holding time at the firing temperature, so the firing temperature in the primary firing
- the heating rate up to the firing temperature and the holding time at the firing temperature are appropriately determined in consideration of the thickness and size of the base material, PAF, and PFA coating film.
- PFA materials available in powder form and paint form
- impurities contained in PFA materials (available in powder form and paint form) (intermediates generated in the process of polymerization, unreacted or unreacted substances, molecular weight distribution)
- the terminal molecular weight substance and the like are decomposed and removed from the PFA film.
- the smoothness of the PFA film after the secondary baking is improved by removing the extra impurities from the PFA film by the primary baking.
- primary firing seems to not only remove impurities but also make leveling that affects smoothing in secondary firing (the degree of bonding between molten particles) appropriate.
- the primary firing is performed in a gas atmosphere in which oxygen is mixed with a rare gas, such as a 20 vol% O 2 / Ar gas atmosphere.
- the primary firing atmosphere gas is preferably a rare gas / oxygen mixed gas, but is not limited to this in the present invention, and may be an oxygen gas alone or a nitrogen / oxygen mixed gas.
- the sample is cooled to a temperature not higher than the melting point of the PFA to be used (referred to as “Tl”) and solidified (primary cooling / solidification).
- Tl melting point of the PFA to be used
- the temperature Tl below the melting point at this time is preferably 5 to 60 ° C., more preferably 10 to 50 ° C., and still more preferably 20 to 50 ° C. lower than the melting point of the PFA to be used.
- the primary firing temperature is appropriately selected as desired in the above range with respect to the lowest temperature within the range of the width.
- Tl The temperature below the melting point (primary cooling / solidification temperature) Tl is the temperature raising speed for raising the temperature from the Tl to the secondary firing temperature and the holding time at the secondary firing temperature is free of the PFA film obtained by secondary cooling to room temperature. It is set so that the smoothness of the surface is sufficiently secured.
- the secondary firing temperature is a temperature for remelting the PFA film once solidified through the primary firing treatment, and solidifies through a temperature lowering process to room temperature where the PFA coating film subjected to the primary firing treatment is next applied. It is the temperature that promotes smoothing during the process.
- the secondary firing is preferably performed at the melting point of the PFA to be used or a temperature within 15 ° C. higher than this melting point. It is more preferable to carry out at a temperature slightly different from the melting point of the PFA to be used or the melting point before and after that.
- Rf in Structural Formula 1 is “—CF 2 CF 2 CF 3 ” (melting point is 310 ° C.)
- a PFA fine powder is applied to a PFA film forming surface of a workpiece by a predetermined thickness by electrostatic coating. Is heated to 345 ° C. at a programmed heating rate, and this state of 345 ° C. is maintained for 30 minutes (melting step).
- This melting step is performed in a 20 vol% O 2 / Ar gas atmosphere. Next, the atmosphere is switched to a 100 vol% argon atmosphere, and the temperature is decreased to 280 ° C. at a predetermined rate.
- the temperature When the temperature reaches 280 ° C., the temperature is maintained for 30 minutes. Subsequently, it is heated again to 310 ° C. at a predetermined rate (remelting step), and this temperature is maintained for 30 minutes. After holding for 30 minutes, the temperature is lowered to room temperature by stopping heating and allowing to stand naturally. By passing through such a process, a PFA film having a very smooth free surface can be formed.
- a temperature in the range of 295 ° C. to 315 ° C. can be selected as the temperature of the remelting step.
- a temperature in the range of 305 ° C to 315 ° C is selected.
- the smoothness is the best at a temperature slightly different from the melting point around 310 ° C. or around that, but in order to obtain the smoothness suitable for the purpose of the present invention, it is in the range of 305 ° C. to 315 ° C. It is desirable to remelt at temperature.
- the main body pump in the present invention is an example of a screw pump.
- the present invention is not limited to this screw pump, and is a type that supplies lubricating oil to a rotating mechanism.
- the present invention can be applied to any pump that uses a seal gas to prevent lubricating oil or its vapor from entering the exhaust space in the pump.
- the mirror-finished surface of the substrate 1 was subjected to the following treatment and then immersed in a bath of the electroless plating solution (A) to form a Ni film.
- Substrate 1 was immersed in a commercially available degreasing agent (OPC-370 Condy Clean M (trademark), manufactured by Okuno Pharmaceutical Co., Ltd.) at 60 ° C. for 5 minutes. Next, the mirror-finished surface was sufficiently washed with ultrapure water for semiconductors withdrawn from the degreasing agent. Thereafter, it was immersed in a commercially available catalyst-imparting agent (OPC-80 Catalyst (trademark), manufactured by Okuno Pharmaceutical Co., Ltd.) at 25 ° C. for 5 minutes. Subsequently, the mirror-finished surface was sufficiently washed with ultrapure water for semiconductors by pulling it up from the catalyst imparting agent.
- OPC-370 Condy Clean M trademark
- OPC-80 Catalyst manufactured by Okuno Pharmaceutical Co., Ltd.
- the substrate 1 treated in this way was immersed in the electroless plating solution (A) for 70 minutes. Next, it was lifted from the electroless plating solution (A) and sufficiently washed with ultrapure water for semiconductors. When visually observed, the Ni film was uniformly formed on the entire mirror-finished surface, and the free surface was extremely smooth when touched with a finger.
- Ra 0.006 ⁇ m, which was a surface roughness that was the same as the mirror-finished surface of the substrate.
- the base material 1 and the base material 2 provided with the Ni film as described above are immersed in a commercially available degreasing agent (OPC-370 Condy Clean M (trade name), manufactured by Okuno Pharmaceutical Co., Ltd.) at 60 ° C. for 5 minutes. And degreased. Subsequently, it pulled up from the inside of a degreasing agent, and fully wash
- the pre-coating material (primer) is applied to the Ni film surface (Ni film free surface) of the base material 1 subjected to such treatment and the surface of the base material 2 on which the smoothness is measured (mirror finish surface) under the following conditions. And dried.
- these base materials are made of quartz housed in an infrared heating furnace.
- Top coat material AC-5600 (manufactured by Daikin Industries, Ltd.)
- Electrostatic coating device (Landsburg Co., Ltd.): Hand gun REA90 / L High pressure controller 9040 Number of overcoating ... 3 times The amount of coating per one time ... 120 ⁇ 10 ⁇ m Intermediate firing between paintings Approx. 340 ° C, 15 minutes
- thermocouple is attached to the outer periphery of the quartz vessel, and the output of the infrared light source is controlled by a temperature controller so that the temperature will be as programmed based on the temperature information from this thermocouple. It is the composition to do.
- the quartz vessel is provided with a gas pipe for introducing gas from outside the furnace.
- a gas such as argon mixed with 100 vol% argon and 20 vol% oxygen is introduced into the furnace.
- the inside can be adjusted to a desired atmosphere.
- Two substrates 1 and 2 treated with PFA coating are installed in a quartz container, the door is closed and the atmosphere is shut off, and 20 vol% O 2 / Ar gas is introduced into the infrared heating furnace at a flow rate of 1 l / min. Supply started. This state was kept waiting for the atmospheric temperature of the space near the quartz container installation and the temperature of the quartz container to become constant. After the temperature became constant, the infrared light source was turned on. The temperature of the quartz container immediately before turning on the infrared light source was 25 ° C. Subsequently, the output of the infrared light source was gradually increased, and the temperature was raised to approximately 345 ° C. in one hour in a linear function. Subsequently, this state of 345 ° C.
- the quartz container was taken out, and the substrates 1 and 2 were accommodated in a desiccator and naturally cooled.
- the substrates 1 and 2 were sufficiently naturally cooled to room temperature, and then set in a surface roughness measuring device to measure the smoothness of the PFA surface.
- the PFA film on the substrate 1 is referred to as a sample 1-1
- the PFA film on the substrate 2 is referred to as a sample 1-2.
- the free surface of the PFA film of each material was divided into 5 parts every 2 cm in parallel to one side (referred to as X-axis direction for convenience), and each divided surface was measured on a straight line from end to end of the sample.
- Experiment 3 Experiment of smoothness measurement and re-melting of PFA film
- Two plate-like SUS substrates (SUS316L-EP: 2 cm ⁇ 5 cm) that are mirror-polished are prepared (samples 3-1 and 3-2), and the surface of the SUS substrate is mirror-polished in the same manner as in Experiment 1.
- a Ni film was provided.
- Experiment 1 when the surface roughness of the mirror-polished surface and the Ni film surface of the two SUS substrates was measured, the same results as in Experiment 1 were obtained.
- a SUS substrate electrostatically coated with PFA powder was placed on a quartz cage and placed in a quartz container, followed by firing in the following procedure.
- (1) Flow 20% O 2 / Ar at a flow rate of 1 l / min and raise the temperature from room temperature to 345 ° C. over 1 hour.
- (2) Hold the atmosphere at 345 ° C for 30 minutes.
- (3) Ar100% is flowed at a flow rate of 5 l / min and lowered to 280 ° C in 10 minutes.
- the sample 3-2 is moved to the non-heated position so that the subsequent heating history (remelting) does not occur.
- (4) Hold the atmosphere at 280 ° C for 30 minutes.
- a pump with a maximum pumping speed of 20,000 l / min, unequal lead and unequal inclination angle screw gas exhaust, and a sub pump with a pump pump with a maximum pumping speed of 12 l / min are available.
- the same type of gas exhaust pump system was constructed.
- a vacuum processing chamber was connected to the main body pump on the upstream side.
- the main body pump was prepared in common with the exception that the width of the gap 117 was changed to 40 ⁇ m, 30 ⁇ m, 20 ⁇ m, and 10 ⁇ m by replacing the rotating shaft with a predetermined one.
- the seal gas was supplied to the seal gas supply path 114 by a predetermined amount (Xl / min), and the exhaust speed of the sub pump 202 was adjusted so that the pressure of the pressure gauge 203 was 500 torr.
- the amount of seal gas (Yl / min) flowing through the seal gas exhaust path 201 at that time was measured with a flow meter 205.
- Table 5 From the measurement results, the values obtained by determining the flow rate (ml / min) of the seal gas flowing on the screw side (exhaust system space of the main body pump) and on the drive system side (subpon side) are shown.
- the pump according to the present invention can significantly reduce the consumption of the seal gas, the gas processing cost for reusing the gas used in the processing process can be significantly reduced. Further, it can greatly contribute to the reuse of valuable and expensive gases such as Kr and Xe, and is employed as a high-efficiency pump in a resource circulation type system.
- Screw pump (main body pump) 101 ⁇ Female screw rotor 102 ⁇ Male screw rotor 103 ⁇ Screw tooth groove portion 104 ⁇ Screw female and male tooth groove meshing portion 105 ⁇ Rotary shaft 106 ⁇ ⁇ ⁇ Stator 107 ⁇ ⁇ ⁇ ... Angular bearing 108 ... Seal housing 109 ... Lubricating oil supply passage 110 ... Base plate 111 ... Lubricating oil 112 ... Lubricating oil reservoir 113 ... Seal Member 114 ⁇ Seal gas supply passage 115 ⁇ Seal gas discharge passage 116 ⁇ Bearing body 117 ⁇ Gap 201 ⁇ Seal gas exhaust passage 202 ⁇ Diaphragm pump (sub pump ) 203 ... Pressure gauge 204 ... Needle valve 205 ...
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Abstract
Description
前記回転軸の全周に亘って前記回転軸と前記シールハウジングとの間に架橋され、前記挟持手段に注がれる潤滑油が前記間隙を通じて前記本体ポンプの排気系空間に侵入するのを抑止するシール部材と、前記間隙にシールガスを供給するための供給口を有するシールガス供給路と、前記間隙に供給されるシールガスを前記間隙から前記本体ポンプの外に排気するためのシールガス吸口を有するシールガス排気路とを備え、前記サブポンプは、前記シールガス排気路を減圧するためのポンプであることを特徴とする。
図2は、本発明を説明するためのガス排気用ポンプシステムの一例の模式的説明図である。図2に示すスクリューポンプ(本体ポンプ)は、図1に示スクリューポンプと本質的に同じであるので、図1と共通なところは同じ番号を付してある。図1に示す不等リード・不等傾斜角スクリューガス排気用ポンプ(本体ポンプ)100は、不等リード・不等傾斜角の雌スクリューローター101と雄スクリューローター102とを有する。両スクリューローター101,102は、安全と円滑な回転運動を得る目的で所望のクリアランスを設けてその歯溝を噛合わされることでスクリュー雌雄歯溝噛合部104を形成している。雌雄のスクリューローター101,102が、夫々の回転軸(雌のスクリューローターの回転軸は不図示、105は、雄のスクリューローターの回転軸)に固定される際は、その噛合せ状態が保持される。そして、両ローター101、102は、その歯溝最先端とステータ106の内壁との間に所定の間隙117を設けてステータ106内に収容される。
AC-5539(静電塗装高分子厚塗り用、紛体)
AC系列としては、この他には、AC-5600、ACX-21、ACX-31、ACX-31WH、ACX-34、ACX-41が挙げられる。
EM-500CL(水性トップコート用)、EM-500GN(水性トップコート用)、EM-700CL(水性トップコート用)、EM-700GN(水性トップコート用)、EM-700GY(水性トップコート用)が挙げられ、これらは、複雑な形状のために静電塗装が出来ない物品向きである。
NK-108(潤滑性、標準膜厚50μm、耐熱温度260℃)、NK-372,379(潤滑、帯電防止、標準膜厚100、300μm、耐熱温度260℃)、NK-013,013C(耐摩耗、標準膜厚300μm、耐熱温度150℃)が挙げられる。
NF-015(標準膜厚50μm)、NF-015EC(標準膜厚40μm、帯電防止)、NF-020AC(標準膜厚600μm、帯電防止)が挙げられる。
(1)金属基材(被塗装材)(電解研磨処理済)の準備 → (2)脱脂またはカラ焼き → (3)粗面化処理(ブラスト処理)又は/及び下地膜形成 → (4)清浄化 → (5)プライマー塗装 → (6)予備乾燥 → (7)トップコート(PFA)塗装 → (8)予備乾燥 → (9)一次焼成(溶融) → (10)一次冷却(使用するPFAの融点より低くする) → (11)二次焼成(再溶融) → (12)二次冷却(室温)
厚めのトップコート層を設ける場合は、上記工程に於いて、「(7)トップコート(PFA)塗装 → (8)予備乾燥 → (9)一次焼成(溶融)」を繰り返し行うことで所望の厚さにトップコート層を形成することができる。この場合の一回当たりの塗装厚は、使用するPFAの形態(パウダーか塗料か)、溶融処理時の粘度、塗料の場合はPFAの分散濃度と粒径、パウダーの場合はパウダーの粒径、等によって適宜決められる。
鏡面研磨処理した後、所定の洗浄処理を施した板状のSUS基材(SUS316LーEP:10x10mm2、厚さ2mm)を2枚(基材1,2)、用意した。これらの基材の鏡面加工面の表面平滑度を市販の面粗さ測定装置(Veeco社製 dektak 6M)で測定したところ、何れも面粗度Raは、0.006μmであった。
無電解メッキ液(A):硫酸ニッケル・・・・・・・26.3g/l
次亜リン酸ナトリウム・・・21.2g/l
クエン酸・・・・・・・・・25.0g/l
酢酸・・・・・・・・・・・12.5g/l
ロッセル塩・・・・・・・・16.0g/l
尿素・・・・・・・・・・・12.5g/l
pH・・・・・・・・・・・6.0
浴温・・・・・・・・・・・80℃
このような処理を施した基材1のNi膜表面(Ni膜の自由表面)と基材2の平滑度を測定した面(鏡面加工面)に、以下の条件でプレコート材(プライマー)を塗布し、乾燥させた。
プレコート材(プライマー):EK-1908S21L(ダイキン工業株式会社製)
塗装条件:スプレーガンのノズル径・・・・・1.2mmφ
霧化圧力・・・・・・・・・・・・0.3MPa
乾燥条件:85℃、15分
トップコート材: AC-5600(ダイキン工業株式会社製)
静電塗装装置(ランズバーグ株式会社製):ハンドガン・・・・・REA90/L
高圧コントローラ・・9040
重ね塗り回数・・・・3回
一回当たりの塗装量・・・・120±10μm
塗装間での中間焼成・・・・・約340℃、15分
測定結果が、表1に示される。
実験1における板状基材に代えて、内面が円筒凹面(曲率半径:5cm)の半円筒基材にした以外は、実験1と同様にして、各基材をNi処理やPFA処理を施して平滑度測定用の試料2-1(Ni処理が施されている)、2-2(Ni処理が施されてない)を得た。これらについて、実験1と同様にして平滑度を測定した。その結果を表2-1,2-2に示す。
鏡面研磨がされている板状SUS基板(SUS316L―EP:2cm×5cm)を2枚(試料3-1,3-2)用意し、実験1と同様にしてSUS基板の鏡面研磨した面上にNi膜を設けた。実験1と同様に、2枚のSUS基板の鏡面研磨面とNi膜面の表面粗さを測定したところ、実験1と略同様の結果を得た。
委託先:日本フッソ工業株式会社
トップコート材:ACX-31(ダイキン工業株式会社製)
塗装法:静電塗装
PFA塗装厚:20μm
(1)20%O2/Arを1l/minの流量で流し室温から345℃まで1時間で昇温する。
(2)雰囲気はそのままで345℃を30分間保持する。
(3)Ar100%を5l/minの流量で流し10分で280℃に下げる。この段階で、試料3-2は、不加熱位置に移動させ、その後の加熱履歴(再溶融)が生じないようにする。
(4)雰囲気はそのままで280℃を30分間保持する。
(5)雰囲気をAr100%、1l/minの流量に変えて6分で280℃から310℃まで昇温する。
(6)雰囲気はそのままで310℃を30分間保持する。
(7)加熱をOFFにし石英製の簀の子(試料3-1の)を不加熱位置に移動させて自然放冷させる。
試料3-1:Ra=0.061μm、PV=0.302μm
試料3-2:Ra=0.354μm、PV=2.141μm
トップコート材を変え、表4に記載の条件にした以外は、実験1と同様にして板状SUS基材の鏡面研磨面上にPFA膜を設けて、実験1と同様にしてPFA膜表面の平滑度を測定した。結果は、表4に示す。
トップコート材
MP-310(三井・デュポンフロロケミカル社)
EM-500CL(三井・デュポンフロロケミカル社)
EM-700CL(三井・デュポンフロロケミカル社)
AW-5000L(ダイキン工業株式会社)
101・・・・雌スクリューローター
102・・・・雄スクリューローター
103・・・・スクリュー歯溝部
104・・・・スクリュー雌雄歯溝噛合部
105・・・・回転軸
106・・・・ステータ
107・・・・アンギュラーベアリング
108・・・・シールハウジング
109・・・・潤滑油供給路
110・・・・ベースプレート
111・・・・潤滑油
112・・・・潤滑油貯留部
113・・・・シール部材
114・・・・シールガス供給路
115・・・・シールガス排出路
116・・・・軸受ボディ
117・・・・間隙
201・・・・シールガス排気経路
202・・・・ダイヤフラムポンプ(サブポンプ)
203・・・・圧力計
204・・・・ニードル弁
205・・・・流量計
206・・・・圧力計
207・・・・オイルトラップ
208・・・・排気口
209・・・・栓
210・・・・シールハウジング内壁面
211・・・・回転軸外表面
212・・・・PFA膜
213・・・・注油口
214・・・・シールガス吸口
215・・・・シールガス供給口
Claims (6)
- 本体ポンプとサブポンプとを有するガス排気用ポンプシステムにおいて、
前記本体ポンプは、
スクリューローターと、
前記スクリューローターに固設し又は前記スクリューローターと一体的に成形されていて、前記スクリューローターを回転するための回転駆動手段に回転自在に係合する回転軸と、
前記回転軸を回転自在に挟持する挟持手段と、
前記挟持手段に潤滑油を注油するための注油口を一端に有する潤滑油供給路と、
前記回転軸の外周面と所定の間隙をおいて、前記回転軸の前記挟持手段により挟持されていない部分の周囲を覆うシールハウジングと、
前記回転軸の全周に亘って前記回転軸と前記シールハウジングとの間に架橋され、前記挟持手段に注がれる潤滑油が前記間隙を通じて前記本体ポンプの排気系空間に侵入するのを抑止するシール部材と、
前記間隙にシールガスを供給するための供給口を有するシールガス供給路と、
前記間隙に供給されるシールガスを前記間隙から前記本体ポンプの外に排気するためのシールガス吸口を有するシールガス排気路と
を備え、
前記サブポンプは、前記シールガス排気路を減圧するためのポンプであることを特徴とするガス排気用ポンプシステム。 - 本体ポンプとサブポンプとを有するガス排気用ポンプシステムにおいて、
前記本体ポンプは、
ローターと、
前記ローターに固設し又は前記ローターと一体的に成形されていて、前記ローターを回転するための回転駆動手段に回転自在に係合する回転軸と、
前記回転軸を回転自在に挟持する挟持手段と、
前記挟持手段に潤滑油を注油するための注油口を一端に有する潤滑油供給路と、
前記回転軸の外周面と所定の間隙をおいて、前記回転軸の前記挟持手段により挟持されていない部分の周囲を覆うシールハウジングと、
前記回転軸の全周に亘って前記回転軸と前記シールハウジングとの間に架橋され、前記挟持手段に注がれる潤滑油が前記間隙を通じて前記本体ポンプの排気系空間に侵入するのを抑止するシール部材と、
前記間隙にシールガスを供給するための供給口を有するシールガス供給路と、
前記間隙に供給されるシールガスを前記間隙から前記本体ポンプの外に排気するためのシールガス吸口を有するシールガス排気路と
を備え、
前記サブポンプは、前記シールガス排気路を減圧するためのポンプであることを特徴とするガス排気用ポンプシステム。 - 本体ポンプとサブポンプとを有するガス排気用ポンプシステムを用いたガス排気方法であって、
前記本体ポンプは、プロセスチャンバー内を大気圧以下に減圧出来るように前記プロセスチャンバーと接続関係にあり、
スクリューローターと、
前記スクリューローターに固設し又は前記スクリューローターと一体的に成形されていて、前記スクリューローターを回転するための回転駆動手段に回転自在に係合する回転軸と、
前記回転軸を回転自在に挟持する挟持手段と、
前記挟持手段に潤滑油を注油するための注油口を一端に有する潤滑油供給路と、
前記回転軸の外周面と所定の間隙をおいて、前記回転軸の前記挟持手段により挟持されていない部分の周囲を覆うシールハウジングと、
前記回転軸の全周に亘って前記回転軸と前記シールハウジングとの間に架橋され、前記挟持手段に注がれる潤滑油が前記間隙を通じて前記本体ポンプの排気系空間に侵入するのを抑止するシール部材と、
前記間隙にシールガスを供給するための供給口を前記シール部材より上流側に有するシールガス供給路と、
前記間隙に供給されるシールガスを前記間隙から前記本体ポンプの外に排気するためのシールガス吸口を前記シール部材の下流側に有するシールガス排気路と
を備え、
前記サブポンプは、前記シールガス排気路を減圧するために前記シールガス排気路と接続関係にあり、
前記ガス排気用ポンプシステムを稼働させる際に、前記本体ポンプの排気稼働と前記サブポンプの減圧稼働を連動させるステップを含むことを特徴とするガス排気方法。 - 本体ポンプとサブポンプとを有するガス排気用ポンプシステムを用いたガス排気方法であって、
前記本体ポンプは、プロセスチャンバー内を大気圧以下に減圧出来るように前記プロセスチャンバーと接続関係にあり、
ローターと、
前記ローターに固設し又は前記ローターと一体的に成形されていて、前記ローターを回転するための回転駆動手段に回転自在に係合する回転軸と、
前記回転軸を回転自在に挟持する挟持手段と、
前記挟持手段に潤滑油を注油するための注油口を一端に有する潤滑油供給路と、
前記回転軸の外周面と所定の間隙をおいて、前記回転軸の前記挟持手段により挟持されていない部分の周囲を覆うシールハウジングと、
前記回転軸の全周に亘って前記回転軸と前記シールハウジングとの間に架橋され、前記挟持手段に注がれる潤滑油が前記間隙を通じて前記本体ポンプの排気系空間に侵入するのを抑止するシール部材と、
前記間隙にシールガスを供給するための供給口を前記シール部材より上流側に有するシールガス供給路と、
前記間隙に供給されるシールガスを前記間隙から前記本体ポンプの外に排気するためのシールガス吸口を前記シール部材の下流側に有するシールガス排気路と
を備え、
前記サブポンプは、前記シールガス排気路を減圧するために前記シールガス排気路と接続関係にあり、
前記ガス排気用ポンプシステムを稼働させる際に、前記本体ポンプの排気稼働と前記サブポンプの減圧稼働を連動させるステップを含むことを特徴とするガス排気方法。
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| CN111247343A (zh) * | 2017-10-24 | 2020-06-05 | 开利公司 | 用于压缩机的润滑剂供应通道 |
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| JPH0460193A (ja) * | 1990-06-29 | 1992-02-26 | Hitachi Ltd | ドライ真空ポンプの異物捕集装置 |
| JPH0544852A (ja) * | 1991-08-09 | 1993-02-23 | Hitachi Ltd | 真空ポンプ用オイルシール |
| JPH0681788A (ja) * | 1992-09-02 | 1994-03-22 | Hitachi Ltd | スクリュー真空ポンプ |
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| GB1248031A (en) * | 1967-09-21 | 1971-09-29 | Edwards High Vacuum Int Ltd | Two-stage rotary vacuum pumps |
| US4722664A (en) * | 1981-06-05 | 1988-02-02 | The Duriron Company, Inc. | Lined corrosion resistant pump |
| JPH065107B2 (ja) * | 1986-01-14 | 1994-01-19 | 株式会社日本製鋼所 | 耐食性を具えた圧力容器の製造方法 |
| JPH0666281A (ja) * | 1992-08-18 | 1994-03-08 | Hitachi Ltd | 真空ポンプ用軸封装置 |
| JP3026394B2 (ja) * | 1992-09-11 | 2000-03-27 | 株式会社日立製作所 | ドライスクリュー圧縮機及びその加工方法 |
| US5401149A (en) * | 1992-09-11 | 1995-03-28 | Hitachi, Ltd. | Package-type screw compressor having coated rotors |
| JP2001207984A (ja) * | 1999-11-17 | 2001-08-03 | Teijin Seiki Co Ltd | 真空排気装置 |
| JP2001323817A (ja) * | 2000-05-16 | 2001-11-22 | Ishikawajima Harima Heavy Ind Co Ltd | 機械駆動式過給機のシール構造 |
| JP2007126993A (ja) * | 2005-11-01 | 2007-05-24 | Toyota Industries Corp | 真空ポンプ |
-
2012
- 2012-06-27 US US14/235,860 patent/US20140193283A1/en not_active Abandoned
- 2012-06-27 JP JP2013526718A patent/JP5499411B2/ja not_active Expired - Fee Related
- 2012-06-27 KR KR1020147002159A patent/KR101412644B1/ko not_active Expired - Fee Related
- 2012-06-27 CN CN201280038084.7A patent/CN103717902A/zh active Pending
- 2012-06-27 WO PCT/JP2012/004181 patent/WO2013018272A1/ja not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0318684A (ja) * | 1989-06-14 | 1991-01-28 | Hitachi Ltd | 真空ポンプ用軸封装置 |
| JPH0460193A (ja) * | 1990-06-29 | 1992-02-26 | Hitachi Ltd | ドライ真空ポンプの異物捕集装置 |
| JPH0544852A (ja) * | 1991-08-09 | 1993-02-23 | Hitachi Ltd | 真空ポンプ用オイルシール |
| JPH0681788A (ja) * | 1992-09-02 | 1994-03-22 | Hitachi Ltd | スクリュー真空ポンプ |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20170037907A1 (en) * | 2014-01-14 | 2017-02-09 | Nsk Ltd. | Rotation mechanism, machine tool, and semiconductor manufacturing device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103717902A (zh) | 2014-04-09 |
| US20140193283A1 (en) | 2014-07-10 |
| JPWO2013018272A1 (ja) | 2015-03-05 |
| KR20140053135A (ko) | 2014-05-07 |
| JP5499411B2 (ja) | 2014-05-21 |
| KR101412644B1 (ko) | 2014-07-03 |
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