WO2022137812A1 - 圧力センサ - Google Patents
圧力センサ Download PDFInfo
- Publication number
- WO2022137812A1 WO2022137812A1 PCT/JP2021/040333 JP2021040333W WO2022137812A1 WO 2022137812 A1 WO2022137812 A1 WO 2022137812A1 JP 2021040333 W JP2021040333 W JP 2021040333W WO 2022137812 A1 WO2022137812 A1 WO 2022137812A1
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- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- diaphragm
- base ring
- pressure sensor
- fixed
- Prior art date
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 29
- 238000001514 detection method Methods 0.000 claims abstract description 3
- 238000007789 sealing Methods 0.000 claims description 46
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 15
- ZGDWHDKHJKZZIQ-UHFFFAOYSA-N cobalt nickel Chemical compound [Co].[Ni].[Ni].[Ni] ZGDWHDKHJKZZIQ-UHFFFAOYSA-N 0.000 claims description 15
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- OGSYQYXYGXIQFH-UHFFFAOYSA-N chromium molybdenum nickel Chemical compound [Cr].[Ni].[Mo] OGSYQYXYGXIQFH-UHFFFAOYSA-N 0.000 description 3
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- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 2
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- 238000003466 welding Methods 0.000 description 2
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- PRQRQKBNBXPISG-UHFFFAOYSA-N chromium cobalt molybdenum nickel Chemical compound [Cr].[Co].[Ni].[Mo] PRQRQKBNBXPISG-UHFFFAOYSA-N 0.000 description 1
- BIJOYKCOMBZXAE-UHFFFAOYSA-N chromium iron nickel Chemical compound [Cr].[Fe].[Ni] BIJOYKCOMBZXAE-UHFFFAOYSA-N 0.000 description 1
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- LXEXBJXDGVGRAR-UHFFFAOYSA-N trichloro(trichlorosilyl)silane Chemical compound Cl[Si](Cl)(Cl)[Si](Cl)(Cl)Cl LXEXBJXDGVGRAR-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/0007—Fluidic connecting means
- G01L19/003—Fluidic connecting means using a detachable interface or adapter between the process medium and the pressure gauge
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
- G01L9/0042—Constructional details associated with semiconductive diaphragm sensors, e.g. etching, or constructional details of non-semiconductive diaphragms
- G01L9/0044—Constructional details of non-semiconductive diaphragms
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/0007—Fluidic connecting means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/14—Housings
- G01L19/145—Housings with stress relieving means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
- G01L9/0051—Transmitting or indicating the displacement of flexible diaphragms using variations in ohmic resistance
Definitions
- the present invention relates to a pressure sensor, and more particularly to a diaphragm type pressure sensor which is suitably used for measuring the pressure of a gas supplied to a semiconductor manufacturing apparatus or the like.
- a mass flow controller thermal mass flow controller
- a pressure type flow rate control device is known as a mass flow controller
- the pressure type flow rate control device can control the mass flow rate of various fluids with high accuracy by a relatively simple configuration that combines a control valve and a throttle portion (for example, an orifice plate or a critical nozzle) on the downstream side thereof.
- the pressure type flow rate control device has an excellent flow rate control characteristic that stable flow rate control can be performed even if the supply pressure on the primary side fluctuates greatly (for example, Patent Document 1).
- the pressure type flow control device is provided with a pressure sensor for measuring the pressure on the downstream side of the control valve.
- a pressure sensor for example, a type in which a strain gauge is attached to a diaphragm to detect the pressure of gas is used (for example, Patent Document 2).
- the diaphragm is configured to be deformed or distorted according to the pressure of the measuring gas, and the pressure of the measuring gas is measured based on the magnitude of the stress detected by the strain gauge. ..
- a configuration has been known in which a liquid raw material is vaporized and supplied by using a vaporization supply device connected to the upstream side of a pressure type flow rate control device (for example, Patent Document 3).
- a vaporization supply device liquid raw materials such as trimethylaluminum (TMAl), tetraethyl orthosilicate (TEOS), and disilicon hexachloride (HCDS) are pressure-fed to the vaporization chamber of the vaporization supply device and heated by a heater.
- TMAl trimethylaluminum
- TEOS tetraethyl orthosilicate
- HCDS disilicon hexachloride
- the vaporized raw material gas is flow-controlled by a pressure-type flow rate control device provided on the downstream side of the vaporization chamber and supplied to the process chamber.
- a high temperature gas of 200 ° C. or higher may be supplied to the pressure type flow rate control device. Further, in a state where the stop valve on the downstream side of the pressure type flow control device is closed, for example, a high pressure gas of about 200 kPa abs (absolute pressure) may be applied to the pressure sensor as a load for a certain period of time or longer.
- the inventor of the present application opened the stop valve from the gas pressure sealed state and evacuated in the flow path to which the pressure type flow control device was connected, especially under the above-mentioned high temperature and high pressure usage environment. Occasionally, it was discovered that the output (absolute pressure) of the pressure sensor drops beyond zero to a negative value (hereinafter, sometimes referred to as zero point deviation or zero point drop). Then, after the pressure sensor shows an output that falls below zero in this way, it takes a considerable amount of time, for example, a number, for the output of the pressure sensor to recover from minus to zero even in a state where evacuation is continued. I confirmed that it may take some time.
- the present invention has been made to solve the above problems, and an object of the present invention is to provide a pressure sensor in which a zero point drop in which an output falls below zero is suppressed when used in a high temperature environment. ..
- the pressure sensor according to the embodiment of the present invention is a bottomed tubular sensor module which is fixed to a body in which a flow path is formed and has a pressure receiving chamber inside which communicates with the flow path, and is a diaphragm in contact with the pressure receiving chamber.
- a sensor module including the above, a pressure detecting element fixed to the diaphragm and outputting the strain of the diaphragm as pressure, and fixed at the outer edge of the open side end portion of the sensor module, and arranged on the outer peripheral side of the sensor module.
- the diaphragm is formed from a cobalt-nickel alloy.
- the diaphragm is formed of a cobalt-nickel alloy that has been heat treated at a temperature of 500 ° C. or higher for 100 minutes or longer.
- the base ring is formed with a groove for relaxing the stress transmitted to the diaphragm when it is fixed to the body using the holding flange.
- the groove is formed along the circumferential direction at the end face of the base ring on the side to which the hermetic member is fixed.
- the groove is formed along the circumferential direction on the inner peripheral surface of the base ring facing the sensor module.
- the hermetic member is fixed to the outer peripheral portion of the base ring, further provided with a cylindrical outer peripheral wall having the same diameter as the base ring, and the hermetic member is arranged with a gap inside the outer peripheral wall.
- the hermetic member includes a hermetic ring that is fixed to the base ring and a lid that is arranged to cover the diaphragm with a gap and seals the hermetic ring.
- the temperature of the sealed fluid is 210 ° C.
- the sealing period is 120 minutes
- the sealing is performed. Stopping pressure 200 kPa abs.
- the amount of the pressure output by the pressure detecting element when the vacuum is drawn is less than zero, which is 0.25% or less of the sealing pressure.
- the tightening torque of the holding flange to the body is 50 Nm or less.
- the amount of zero point drop generated when evacuated after pressure sealing in a high temperature environment is reduced.
- FIG. 1 It is a figure which shows the gas supply system which uses the pressure sensor by embodiment of this invention. It is a figure which shows the pressure sensor by embodiment of this invention, (a) is a sectional view, (b) is a transmission view when viewed from the top surface. It is sectional drawing which shows the attachment mode of the pressure sensor to a body. It is a figure which shows the zero point drop of a pressure sensor at the time of vacuum exhaust after pressure-sealing, (a) is a figure which shows the whole process, (b) is an enlarged view compressed in the time axis direction. It is a figure which shows that the zero point drop amount fluctuates by the sealing pressure. It is a figure which shows that the zero point drop amount (offset voltage fluctuation amount) fluctuates according to the ambient temperature.
- FIG. 1 shows a high temperature gas supply system 100 including a pressure type flow rate control device 20 including a pressure sensor 10 according to an embodiment of the present invention and a vaporization supply device 30 provided on the upstream side thereof.
- 2 (a) and 2 (b) show the pressure sensor 10 according to the present embodiment.
- the pressure sensor 10 is provided in the flow path between the control valve 22 of the pressure type flow control device 20 and the throttle portion 24, and the upstream pressure of the throttle portion 24 (hereinafter, upstream pressure P1 or It is used to detect the control pressure).
- the output of the pressure sensor 10 is used for feedback control of the control valve 22, and by controlling the upstream pressure P1 using the control valve 22, it is possible to control the flow rate of the fluid flowing downstream of the throttle portion 24.
- a stop valve 28 is provided on the downstream side of the throttle portion 24, and by closing the stop valve 28, the gas supply can be stopped more reliably.
- control valve 22 various valves (proportional valves) that can be adjusted to an arbitrary opening degree are used, and for example, a piezo valve configured to adjust the opening degree of the diaphragm valve by a piezo actuator is preferably used.
- a piezo valve configured to adjust the opening degree of the diaphragm valve by a piezo actuator is preferably used.
- an on / off valve such as an air-driven valve (AOV) or a solenoid valve having excellent responsiveness and breaking property is preferably used.
- An orifice plate or a critical nozzle is preferably used as the throttle portion 24.
- the orifice diameter or nozzle diameter is set to, for example, 10 ⁇ m to 2000 ⁇ m.
- the vaporization supply device 30 receives the liquid raw material L, vaporizes it, and sends it to the pressure type flow rate control device 20 as the gas G.
- the vaporization supply device 30 has a preheating unit 32 for preheating the liquid raw material L and a vaporization unit 34 connected to the preheating unit 32 via the liquid material supply valve 36, and supplies the liquid raw material.
- the supply amount of the liquid raw material L to the vaporization unit 34 can be controlled by the opening / closing operation of the valve 36.
- the preheating unit 32 of the vaporization supply device 30 is heated to, for example, 180 ° C. by a heater, the vaporization unit 34 is heated to, for example, 200 ° C., and pressure type flow rate control is performed to prevent reliquefaction of the delivered gas.
- the device 20 is heated to, for example, 210 ° C. or higher. Therefore, the pressure sensor 10 is also heated to a high temperature of 200 ° C. or higher, and it is required to accurately detect the pressure even in such a high temperature environment.
- the stop valve 28 is also heated by the heater, and the outlet side of the stop valve 28 is heated to, for example, 220 ° C.
- the set temperature of the heater is arbitrarily selected depending on the material to be vaporized.
- an inflow pressure sensor 26 for measuring the supply pressure P0 is also provided on the upstream side of the control valve 22.
- the output of the inflow pressure sensor 26 is used, for example, for controlling the amount of gas generated in the vaporization unit 34.
- the inflow pressure sensor 26 may also have the same configuration as the pressure sensor 10 described below.
- the pressure sensor 10 of the present embodiment has a diaphragm 11a having one side in contact with the pressure receiving chamber C1, and a strain gauge on the surface opposite to the pressure receiving chamber C1.
- the pressure detecting element 12 including the above is fixed.
- the vacuum chamber C2 is provided so as to be in contact with the surface opposite to the pressure receiving chamber C1 (or the surface provided with the pressure detecting element 12).
- the pressure sensor 10 is configured to output zero as an absolute pressure when no stress is generated in the diaphragm 11a, that is, when the pressures of the pressure receiving chamber C1 and the vacuum chamber C2 are considered to be equivalent.
- FIG. 3 shows an example of mounting the pressure sensor 10.
- the pressure sensor 10 is accommodated and fixed in an accommodating recess provided on the lower surface of the body 5 in which the flow path is formed, in a mode opposite to the orientation shown in FIG. 2A.
- the body 5 is a metal block (for example, manufactured by SUS316L) in which the flow path of the pressure type flow rate control device 20 shown in FIG. 1 is formed, and a piezo valve or the like is attached to the upper surface side of the body 5.
- a communication passage is provided for communicating the flow path formed in the body 5 and the pressure receiving chamber C1 of the pressure sensor 10, and the pressure sensor 10 is a fluid flowing through the flow path of the body 5. Pressure can be measured.
- the pressure sensor 10 may be attached to another place such as the upper surface side (the side where the piezo valve is fixed) of the body 5 as long as it communicates with the flow path.
- the pressure sensor 10 is fixed so as to be pressed against the bottom surface of the accommodating recess of the body 5 while the sealing property is maintained by the gasket 18.
- the pressure sensor 10 is fixed by tightening the holding flange 19 (for example, manufactured by SUS316L) from the outside.
- the holding flange 19 for example, manufactured by SUS316L
- the magnitude of the tightening torque N of the holding flange 19 changes.
- fixing is performed with a relatively small torque (for example, 50 Nm or less), in order to reduce the stress applied to the pressure sensor 10, particularly the diaphragm 11a at the time of fixing.
- the change in the sensor output due to the tightening torque N will be described later.
- the pressure sensor 10 has a diaphragm 11a that is in contact with the fluid flowing into the pressure receiving chamber C1 and is distorted according to the pressure of the fluid, but the diaphragm 11a is a sensor module 11 formed in a bottomed cylindrical shape. It is provided as the bottom of the.
- the sensor module 11 is supported by a base ring 14 that is fitted and fixed. Further, a hermetic member 13 (including the hermetic ring 13a and the lid 15) is fixed to the upper end surface of the base ring 14. The hermetic member 13 (more specifically, the hermetic ring 13a) and the base ring 14 are airtightly connected by welding an annular step portion to be fitted, and the sensor module 11 is housed in these internal spaces. ..
- the hermetic member 13 is formed into a bottomed tubular shape by welding a tubular hermetic ring 13a and a lid 15.
- the hermetic member 13 is provided above the diaphragm 11a of the sensor module 11. More specifically, the hermetic ring 13a is fixedly provided to the base ring 14 as the outer peripheral wall of the diaphragm 11a, and the lid 15 seals the opening of the hermetic ring 13a so as to open a gap and cover the diaphragm 11a. It is provided in.
- the inside of the hermetic member 13 is evacuated and then sealed to form a vacuum chamber (sealing vacuum chamber) C2 in an airtightly sealed state in contact with the diaphragm 11a.
- the vacuum chamber C2 is a space facing the pressure receiving chamber C1 with the diaphragm 11a interposed therebetween.
- the tips of a plurality of lead wires 13c are hermetically inserted into the hermetic ring 13a via a low melting point glass material 13b, and the tips of the lead wires 13c are pressure-detected via a bonding wire. It is connected to the strain gauge of the element 12.
- the bonding wire is usually formed of gold, but aluminum, copper, or the like may be used instead of gold.
- the wire diameter of the bonding wire is designed to be 10 to 50 ⁇ m.
- the strain gauge is usually composed of a resistance wire of a metal foil, and the magnitude of strain generated in the diaphragm 11a is detected by detecting a change in the electric resistance of the resistance wire by a bridge circuit via a lead wire 13c. can do.
- the base ring 14 has a housing recess having an inner peripheral surface facing the outer peripheral surface of the cylindrical portion 11b of the sensor module 11.
- the open side end portion 11c of the sensor module 11 is formed to have a smaller diameter than the cylindrical portion 11b and has a flange, and the accommodating recess of the base ring 14 also fits the open side end portion 11c of the sensor module 11. It is formed in a shape.
- the base ring 14 is welded to the outer edge of the open side end portion 11c of the sensor module 11, and the base ring 14 and the sensor module 11 are firmly fixed to each other.
- An annular notch for arranging the ring-shaped gasket 18 is formed on the lower side of the outer peripheral portion of the base ring 14 (the side facing the bottom surface of the accommodating recess of the body 5).
- the gasket 18 may be formed of a metal such as austenitic stainless steel, but may be formed of an O-ring which is a more flexible material in order to suppress the zero point drop described later.
- the gasket 18 is deformed according to the tightening of the holding flange 19, and the sealing property can be improved.
- the gasket 18 is sandwiched between the base ring 14 and the body 5, and the sensor module 11 is fixed so as to be housed in the base ring 14 instead of directly.
- the stress from the base ring 14 is less likely to be applied to the sensor module 11. Therefore, in the state after mounting, the residual stress in the diaphragm 11a of the sensor module 11 is small, which makes it possible to suppress the zero point drop of the pressure sensor 10 which tends to occur particularly in a high temperature and high pressure environment.
- a cylindrical outer peripheral wall 17 having the same diameter as the base ring 14 is fixed on the upper side of the outer peripheral portion of the base ring 14.
- the hermetic member 13 is arranged inside the outer peripheral wall 17 with a gap.
- the pressure sensor 10 can be easily fixed to the accommodating recess of the body 5 in an airtight manner without rattling. Further, since the pressure sensor 10 is fixed by the holding flange 19 via the outer peripheral wall 17 in contact with the holding flange 19, stress is less likely to occur in the diaphragm 11a even when the holding flange 19 is tightened. However, the outer peripheral wall 17 is not always necessary when sufficient airtightness and fixing condition can be ensured. Further, instead of providing the outer peripheral wall 17 on the base ring 14, a similar outer peripheral wall may be provided on the holding flange 19 to press the peripheral portion of the base ring 14.
- the base ring 14 is formed of Hastelloy C-22 (Hastelloy is a registered trademark), which is one of nickel-molybdenum-chromium alloys having excellent corrosion resistance and the like. Since the base ring 14 is not required to be deformed like the diaphragm 11a, it may be formed of stainless steel (for example, SUS316L or the like) instead of Hastelloy C-22. Further, the hermetic ring 13a and the outer peripheral wall 17 are formed of SUS316L, SUS304, or the like, which are austenitic stainless steels having excellent corrosion resistance and the like.
- the sensor module 11 including the diaphragm 11a is formed of spron 510 (spron is a registered trademark) which is a nickel-cobalt alloy, unlike the base member (hermetic ring 13a and base ring 14).
- spron is a registered trademark
- the material of the diaphragm 11a has a great influence on the zero point drop of the pressure sensor 10.
- the pressure sensor 10 is suitable for use at high temperature and high pressure while ensuring the sealing property by appropriately selecting the material of each constituent member.
- the thickness of the diaphragm 11a is designed to be, for example, 50 ⁇ m to 200 ⁇ m.
- a pressure of, for example, about 200 kPa abs (absolute pressure) or more may be applied to the pressure sensor 10 as a load for a relatively long period such as 2 hours. This occurs, for example, in a situation where the stop valve 28 on the downstream side is closed to stop the gas supply as a preliminary step of the gas supply.
- the control valve 22 When the gas supply is stopped, the control valve 22 is also normally closed, but a leak may occur from the valve seat, and the pressure on the downstream side of the control valve 22 (that is, the upstream pressure P1) is also vaporized and supplied.
- the pressure may be as high as the gas pressure of the device 30 (ie, supply pressure P0). Therefore, when the gas is sealed in the flow path between the vaporization supply device 30 and the stop valve 28 for a long time, the upstream pressure P1 measured by the pressure sensor 10 is also maintained at a high pressure for a long time.
- the stop valve 28 is then opened as shown in FIG. 4B while compressing the time axis and enlarging the time axis.
- the output of the pressure sensor 10 (that is, the upstream pressure P1) may be below zero and show a negative value. Further, the output of the pressure sensor 10 recovers from a negative value to zero with the passage of time, but it may take several hours or more (here, 4.5 hours) for recovery.
- the strain gauge is an element that detects the stress generated in the diaphragm as a change in electrical resistance, it is output by the creep generated in the diaphragm 11a even when the flow path is maintained at the vacuum pressure. Will change over time. Therefore, it is considered that the pressure value below zero is output for a relatively long time until the strain is eliminated, especially in a high temperature environment.
- the reason why the output at the start of vacuum exhaust falls below zero is that unintended stress generated in the diaphragm 11a during pressure fluctuation (for example, stress acting in the direction of compressing the strain gauge) affects the electrical resistance of the strain gauge. It is possible that the value is smaller than the reference value associated with zero absolute pressure.
- FIG. 5 is a graph showing that the zero point drop amount changes depending on the magnitude of the pressure at the time of pressure sealing (hereinafter, may be referred to as the sealing pressure).
- the sealing pressure may be 100 kPa than when the sealing pressure is 50 kPa, and when the sealing pressure is 100 kPa.
- the zero point drop amount is larger at 150 kPa than at 150 kPa, and the zero point drop amount is larger at 200 kPa than at 150 kPa.
- the higher the sealing pressure the larger the zero point drop amount at the time of the drop, and the longer the time required for the recovery.
- FIG. 6 is a graph showing the relationship between the ambient temperature and the offset voltage fluctuation amount (corresponding to the zero point drop amount), and the pressure sealing time is 2 minutes, 20 minutes, and 120 minutes in each case.
- the amount of offset voltage fluctuation immediately after the start of vacuum exhaust is shown. In either case, the sealing pressure was 200 kPa abs. It is unified in.
- the offset voltage fluctuation amount is the output value immediately after the start of vacuum exhaust by the pressure sensor calibrated to output zero when the absolute pressure is zero (that is, when the strain gauge is not distorted). Specifically, it is the value (average value) of the voltage signal output by the Wheatstone bridge circuit connected to the strain gauge.
- the offset voltage fluctuation amount (that is, the zero point drop amount) tends to increase as the pressure sealing time before vacuum exhaust becomes longer and the ambient temperature becomes higher.
- the offset voltage fluctuation amount becomes relatively large, and when the pressure sealing time is 20 minutes or more and the ambient temperature is 250 ° C. or more, or When the pressure sealing time is 120 minutes and the ambient temperature is 200 ° C. or higher, the offset voltage fluctuation amount becomes considerably large.
- the zero point drop amount increases after the diaphragm 11a is exposed to a high temperature and a high load for a long time. Since the zero point drop phenomenon is caused by the creep phenomenon generated in the diaphragm 11a, it is considered that the control of the mechanical properties of the diaphragm 11a is important for suppressing the creep and the zero point drop.
- the inventor of the present application has selected a material for the diaphragm 11a that can suppress the amount of zero point drop.
- a material for the diaphragm 11a that can suppress the amount of zero point drop.
- FIG. 7 shows the composition (% by weight) of four kinds of metals that may be used as the diaphragm 11a.
- Hastelloy which has been often used in the past, is a nickel-molybdenum-chromium alloy containing 50 wt% or more of Ni, but a small content of Co, and contains 13 wt% and 22 wt% of Mo and Cr, respectively. be.
- Inconel 600 (Inconel is a registered trademark) is a nickel-chromium-iron alloy containing mainly nickel, chromium, and iron.
- MAT21® is a Hastelloy-like nickel-molybdenum-chromium alloy containing approximately 1.8 wt% Ta not shown in the table.
- the spron 510 which is the material of the diaphragm 11a in the present embodiment is a cobalt-nickel alloy (or a cobalt-nickel-chromium-molybdenum alloy).
- the cobalt-nickel alloy means an alloy in which the total of Co and Ni is 50 wt% or more and each of Co and Ni is contained in 20 wt% or more. Further, the cobalt-nickel alloy in the present specification typically refers to an alloy in which the Co content is higher than the Cr content and the Mo content.
- Hastelloy, Inconel 600, and MAT21 correspond to non-cobalt-nickel alloys, and only Spron 510 corresponds to cobalt-nickel alloys.
- the cobalt-nickel alloy Spron 510 used in the present embodiment has mechanical properties that are less likely to be deformed than Hastelloy, Inconel 600, and MAT21.
- Hastelloy has a 0.2% proof stress at room temperature of 343 MPa, Inconel 347 MPa, and MAT21 355 MPa, whereas the 0.2% proof stress of Spron 510 after heat treatment, which will be described later, is remarkably large at 1050 MPa. It has been confirmed.
- the diaphragm 11a from a cobalt-nickel alloy that is less likely to be deformed (or has a wider stress range for elastic deformation) and is less likely to cause strain due to stress even at high temperatures. You can expect it.
- FIG. 8 shows the case where the material of the diaphragm 11a is formed from Hastelloy (non-nickel-cobalt alloy) (samples S0, S1) and the case where the material is formed from spron 510 (nickel-cobalt alloy) (samples S2, S3, S4). It is a figure which shows the difference of the zero point drop amount (kPa) of.
- the result shown in FIG. 8 shows the output of the pressure sensor 10 when the pressure sensor 10 is incorporated in the high temperature gas supply system 100 shown in FIG. 1 and the stop valve 28 is opened from the pressure-sealed state to start vacuum exhaust. It was obtained from.
- the measurement results are shown when the pressure sealing time before vacuum exhaust is 2 minutes, 20 minutes, and 120 minutes, respectively.
- the sealing pressure is common at 200 kPa abs
- the set temperature is common at 210 ° C.
- the improvement (%) shown in the table is the suppression rate (drop amount difference / S0 drop amount) of the zero point drop amount in the samples S1 to S4 with respect to the sample S0 (reference embodiment) when the sealing time is 20 minutes. ) Is shown. Since the zero point drop amount shown in the table is rounded to two digits after the decimal point, the improvement rate that can be calculated from the zero point drop amount shown in the table and the value shown as improvement (%) are slightly different. Become.
- the sealing time is 20 minutes or more between the time when the heat treatment is performed and the case where the heat treatment is not performed. In this case, it can be seen that the effect of improving the zero point drop amount is improved by performing the heat treatment.
- the heat treatment was carried out by aging treatment in which heating was performed at a temperature of 525 ° C. for 2 hours under vacuum and then slowly cooled.
- the hardness Hv was improved by a little less than 20% as compared with that before the heat treatment.
- the tensile strength was increased from about 2400 MPa before the heat treatment to 2800 MPa after the heat treatment.
- the 0.2% proof stress after the heat treatment is 1050 MPa as described above, which is a material that is less likely to be deformed than the conventional material.
- the above heat treatment is preferably performed at a temperature of 500 ° C. or higher for 100 minutes or longer.
- the zero point drop improvement effect can be obtained by making the tightening torque N of the holding flange 19 relatively weak, for example, 50 Nm or less. It is improving. It is considered that this is because when the holding flange 19 is tightened too strongly, an extra stress is applied to the diaphragm 11a and the strain generated in the diaphragm 11a is increased.
- the sealing property of the pressure sensor 10 it is better to increase the tightening torque N, but the sealing property is ensured by using the gasket 18, and 50 N. It is preferable to fix the pressure sensor 10 to the body 5 with a tightening torque N of m or less. However, if the tightening torque N is too small, it will hinder the fixing condition and the sealing property of the sensor. Therefore, it is preferable that the tightening torque N is 20 Nm or more.
- the base ring 14 holding the sensor module 11 is grooved.
- the groove processing is provided as a stress transmission relaxation groove for relaxing the stress transmitted to the diaphragm 11a when the pressure sensor 10 is attached by using the holding flange 19.
- the effect of further improving the zero point drop is obtained only by performing the groove processing.
- FIGS. 9A and 9 (b) show the pressure sensors 10A and 10B of the modified example in which the above-mentioned groove processing is performed.
- the stress transmission relaxation groove 14G of another embodiment is formed in the base ring 14.
- the surface of the base ring 14 opposite to the gasket mounting surface that is, the surface pressed by the holding flange 19, or the end surface on the side to which the hermetic member 13 is fixed.
- an annular stress transmission relaxation groove 14G concentric with the hermetic member 13 and the outer peripheral wall 17 is formed.
- the stress transmission relaxation groove 14G has an inner side surface continuous with the outer peripheral surface of the hermetic member 13, and is formed as a groove having a depth of about half to 80% of the thickness of the base ring 14.
- the stress transmission relaxation groove 14G formed in this way relaxes the stress transmission and suppresses the generation of stress in the diaphragm 11a when the holding flange 19 is tightened.
- the stress transfer relaxation groove 14G does not necessarily have to be continuously formed over one circumference as long as a sufficient stress transmission relaxation effect can be obtained, and the groove may be partially interrupted.
- both continuous grooves and intermittent grooves are referred to as grooves formed along the circumferential direction.
- the depth is radial in the sensor module support surface of the base ring 14 (that is, the inner peripheral surface of the base ring 14 facing the outer peripheral surface of the sensor module 11).
- An annular stress transmission relaxation groove 14G having the above is formed.
- the stress transmission relaxation groove 14G formed in this way also relaxes the stress transmission and suppresses the generation of stress in the diaphragm 11a when the holding flange 19 is tightened.
- Patent Document 4 discloses a mounting structure of a pressure sensor in which a shallow groove is provided in the diaphragm base constituting the diaphragm. However, it should be noted that this pressure sensor does not have a groove in the base ring, which is different from the diaphragm component, as shown in FIGS. 9 (a) and 9 (b).
- the effect of suppressing the zero point drop can be obtained only by providing the stress transmission relaxation groove 14G in the base ring 14. This can be seen by comparing sample S0 and sample S1 in FIG. However, as in sample S4, the diaphragm is formed from a heat-treated cobalt-nickel alloy, and the stress transmission relaxation groove processing is also performed to reduce the torque for mounting the sensor, so that the sealing time is long. Regardless of this, the zero point drop improvement rate could be made extremely large.
- the pressure type flow rate control device 20 can be stably used even when used in a high temperature environment on the downstream side of the vaporization supply device 30 as shown in FIG. It will be possible to operate.
- the pressure sensor 10 when the pressure receiving chamber C1 is evacuated after the fluid is sealed in the flow path and the pressure receiving chamber C1, the amount of pressure output by the pressure detecting element 12 is less than zero (absolute value). Can be set to, for example, 0.25% or less (for example, 0.5 kPa or less) of the sealing pressure (for example, 200 kPa).
- the set temperature (fluid temperature) is 210 ° C.
- the sealing period is 120 minutes
- the sealing pressure is 200 kPa abs.
- the zero point drop amount can be improved to 0.5 kPa or less, which is 0.25% or less of the sealing pressure of 200 kPa.
- the zero point drop amount was suppressed as compared with the conventional pressure sensor, but the sealing pressure (200 kPa abs.) was 0.25% or less in the sealing time of 20 minutes. It was difficult to achieve 0.5 kPa or less.
- the sealing pressure of 0.25% or less can be achieved in the sealing time of 20 minutes.
- the sealing pressure was 20 minutes. It can be seen that 0.15% or less (here, 0.3 kPa) of the above can be achieved, and a sufficient zero point drop suppressing effect is obtained.
- the pressure sensor according to the embodiment of the present invention is suitably used for, for example, measuring the pressure of a supply gas in a semiconductor manufacturing apparatus.
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Abstract
Description
10 圧力センサ
11 センサモジュール
11a ダイヤフラム
12 圧力検出素子
13 ハーメチック部材
13a ハーメチックリング
14 ベースリング
14G 応力伝達緩和溝
15 蓋
17 外周壁
18 ガスケット
19 押さえフランジ
20 圧力式流量制御装置
22 コントロール弁
24 絞り部
26 流入圧力センサ
28 ストップバルブ
30 気化供給装置
100 高温ガス供給系
Claims (10)
- 流路が形成されたボディに固定される圧力センサであって、
前記流路と連通する受圧室を内側に有する有底筒状のセンサモジュールであって、前記受圧室に接するダイヤフラムを含むセンサモジュールと、
前記ダイヤフラムに固定され、前記ダイヤフラムの歪を圧力として出力する圧力検出素子と、
前記センサモジュールの開放側端部の外縁において固定され、前記センサモジュールの外周側に配置されるベースリングと、
前記ベースリングに固定され、前記ダイヤフラムを挟んで前記受圧室と対向する封止真空室を形成するためのハーメチック部材と、
前記ベースリングと前記ボディの間に挟持されるガスケットと、
前記ガスケットを介して前記ベースリングを前記ボディに押圧する押さえフランジと
を備える、圧力センサ。 - 前記ダイヤフラムは、コバルト-ニッケル合金から形成されている、請求項1に記載の圧力センサ。
- 前記ダイヤフラムは、500℃以上の温度で100分以上熱処理されたコバルト―ニッケル合金から形成されている、請求項2に記載の圧力センサ。
- 前記ベースリングに、前記押さえフランジを用いた前記ボディへの固定時に前記ダイヤフラムに伝わる応力を緩和させるための溝が形成されている、請求項1から3のいずれかに記載の圧力センサ。
- 前記溝は、前記ハーメチック部材が固定される側の前記ベースリングの端面において周方向に沿って形成されている、請求項4に記載の圧力センサ。
- 前記溝は、前記センサモジュールと面する前記ベースリングの内周面において周方向に沿って形成されている、請求項4に記載の圧力センサ。
- 前記ベースリングの外周部に固定され、前記ベースリングと同径の筒状の外周壁をさらに備え、前記外周壁の内側に間隙を開けて前記ハーメチック部材が配置されている、請求項1から6のいずれかに記載の圧力センサ。
- 前記ハーメチック部材は、前記ベースリングに固定されるハーメチックリングと、前記ダイヤフラムと間隙を開けてこれを覆うように配置され前記ハーメチックリングを封止する蓋とを含む、請求項1から7のいずれかに記載の圧力センサ。
- 前記流路および前記受圧室に流体を封止した後に前記流路および前記受圧室を真空引きしたとき、封止した前記流体の温度が210℃、封止期間120分、封止圧力200kPa abs.の条件下において、前記真空引きしたときに前記圧力検出素子が出力する圧力がゼロを下回る量が、前記封止圧力の0.25%以下である請求項1から8のいずれかに記載の圧力センサ。
- 前記ボディへの前記押さえフランジの締め付けトルクが50N・m以下である、請求項1から9のいずれかに記載の圧力センサ。
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CN202180064327.3A CN116348750A (zh) | 2020-12-23 | 2021-11-02 | 压力传感器 |
KR1020237008666A KR20230049727A (ko) | 2020-12-23 | 2021-11-02 | 압력 센서 |
JP2022571928A JP7370028B2 (ja) | 2020-12-23 | 2021-11-02 | 圧力センサ |
US18/254,235 US20240094078A1 (en) | 2020-12-23 | 2021-11-02 | Pressure sensor |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2005148002A (ja) * | 2003-11-19 | 2005-06-09 | Yokogawa Electric Corp | 圧力センサ |
JP2013057512A (ja) * | 2011-09-07 | 2013-03-28 | Nidec Copal Electronics Corp | 圧力センサ |
WO2014155994A1 (ja) * | 2013-03-28 | 2014-10-02 | 株式会社フジキン | 圧力検出器の取付け構造 |
US20170363499A1 (en) * | 2016-06-15 | 2017-12-21 | Robert Bosch Gmbh | Pressure Sensor |
WO2020075600A1 (ja) * | 2018-10-09 | 2020-04-16 | 株式会社フジキン | 圧力センサ |
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JPS494594B1 (ja) | 1969-11-10 | 1974-02-01 | ||
DE2305030C3 (de) | 1973-02-02 | 1983-02-10 | Wäschle Maschinenfabrik GmbH, 7980 Ravensburg | Anlage zum pneumatischen Fördern von Schüttgütern |
KR102338026B1 (ko) | 2017-07-25 | 2021-12-10 | 가부시키가이샤 후지킨 | 유체 제어 장치 |
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2005148002A (ja) * | 2003-11-19 | 2005-06-09 | Yokogawa Electric Corp | 圧力センサ |
JP2013057512A (ja) * | 2011-09-07 | 2013-03-28 | Nidec Copal Electronics Corp | 圧力センサ |
WO2014155994A1 (ja) * | 2013-03-28 | 2014-10-02 | 株式会社フジキン | 圧力検出器の取付け構造 |
US20170363499A1 (en) * | 2016-06-15 | 2017-12-21 | Robert Bosch Gmbh | Pressure Sensor |
WO2020075600A1 (ja) * | 2018-10-09 | 2020-04-16 | 株式会社フジキン | 圧力センサ |
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JPWO2022137812A1 (ja) | 2022-06-30 |
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